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 <net/flow_keys.h>
  82 #include "bonding.h"
  83 #include "bond_3ad.h"
  84 #include "bond_alb.h"
  85
  86 /*---------------------------- Module parameters ----------------------------*/
  87
  88 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  89 #define BOND_LINK_MON_INTERV    0
  90 #define BOND_LINK_ARP_INTERV    0
  91
  92 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  93 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  94 static int num_peer_notif = 1;
  95 static int miimon       = BOND_LINK_MON_INTERV;
  96 static int updelay;
  97 static int downdelay;
  98 static int use_carrier  = 1;
  99 static char *mode;
 100 static char *primary;
 101 static char *primary_reselect;
 102 static char *lacp_rate;
 103 static int min_links;
 104 static char *ad_select;
 105 static char *xmit_hash_policy;
 106 static int arp_interval = BOND_LINK_ARP_INTERV;
 107 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 108 static char *arp_validate;
 109 static char *arp_all_targets;
 110 static char *fail_over_mac;
 111 static int all_slaves_active;
 112 static struct bond_params bonding_defaults;
 113 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 114
 115 module_param(max_bonds, int, 0);
 116 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 117 module_param(tx_queues, int, 0);
 118 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 119 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 120 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 121                                "failover event (alias of num_unsol_na)");
 122 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 123 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 124                                "failover event (alias of num_grat_arp)");
 125 module_param(miimon, int, 0);
 126 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 127 module_param(updelay, int, 0);
 128 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 129 module_param(downdelay, int, 0);
 130 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 131                             "in milliseconds");
 132 module_param(use_carrier, int, 0);
 133 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 134                               "0 for off, 1 for on (default)");
 135 module_param(mode, charp, 0);
 136 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 137                        "1 for active-backup, 2 for balance-xor, "
 138                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 139                        "6 for balance-alb");
 140 module_param(primary, charp, 0);
 141 MODULE_PARM_DESC(primary, "Primary network device to use");
 142 module_param(primary_reselect, charp, 0);
 143 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 144                                    "once it comes up; "
 145                                    "0 for always (default), "
 146                                    "1 for only if speed of primary is "
 147                                    "better, "
 148                                    "2 for only on active slave "
 149                                    "failure");
 150 module_param(lacp_rate, charp, 0);
 151 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 152                             "0 for slow, 1 for fast");
 153 module_param(ad_select, charp, 0);
 154 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
 155                             "0 for stable (default), 1 for bandwidth, "
 156                             "2 for count");
 157 module_param(min_links, int, 0);
 158 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 159
 160 module_param(xmit_hash_policy, charp, 0);
 161 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 162                                    "0 for layer 2 (default), 1 for layer 3+4, "
 163                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 164                                    "4 for encap layer 3+4");
 165 module_param(arp_interval, int, 0);
 166 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 167 module_param_array(arp_ip_target, charp, NULL, 0);
 168 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 169 module_param(arp_validate, charp, 0);
 170 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 171                                "0 for none (default), 1 for active, "
 172                                "2 for backup, 3 for all");
 173 module_param(arp_all_targets, charp, 0);
 174 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 175 module_param(fail_over_mac, charp, 0);
 176 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 177                                 "the same MAC; 0 for none (default), "
 178                                 "1 for active, 2 for follow");
 179 module_param(all_slaves_active, int, 0);
 180 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 181                                      "by setting active flag for all slaves; "
 182                                      "0 for never (default), 1 for always.");
 183 module_param(resend_igmp, int, 0);
 184 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 185                               "link failure");
 186
 187 /*----------------------------- Global variables ----------------------------*/
 188
 189 #ifdef CONFIG_NET_POLL_CONTROLLER
 190 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 191 #endif
 192
 193 int bond_net_id __read_mostly;
 194
 195 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 196 static int arp_ip_count;
 197 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 198 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 199 static int lacp_fast;
 200
 201 const struct bond_parm_tbl bond_lacp_tbl[] = {
 202 {       "slow",         AD_LACP_SLOW},
 203 {       "fast",         AD_LACP_FAST},
 204 {       NULL,           -1},
 205 };
 206
 207 const struct bond_parm_tbl bond_mode_tbl[] = {
 208 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 209 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 210 {       "balance-xor",          BOND_MODE_XOR},
 211 {       "broadcast",            BOND_MODE_BROADCAST},
 212 {       "802.3ad",              BOND_MODE_8023AD},
 213 {       "balance-tlb",          BOND_MODE_TLB},
 214 {       "balance-alb",          BOND_MODE_ALB},
 215 {       NULL,                   -1},
 216 };
 217
 218 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 219 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 220 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 221 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 222 {       "encap2+3",             BOND_XMIT_POLICY_ENCAP23},
 223 {       "encap3+4",             BOND_XMIT_POLICY_ENCAP34},
 224 {       NULL,                   -1},
 225 };
 226
 227 const struct bond_parm_tbl arp_all_targets_tbl[] = {
 228 {       "any",                  BOND_ARP_TARGETS_ANY},
 229 {       "all",                  BOND_ARP_TARGETS_ALL},
 230 {       NULL,                   -1},
 231 };
 232
 233 const struct bond_parm_tbl arp_validate_tbl[] = {
 234 {       "none",                 BOND_ARP_VALIDATE_NONE},
 235 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 236 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 237 {       "all",                  BOND_ARP_VALIDATE_ALL},
 238 {       NULL,                   -1},
 239 };
 240
 241 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 242 {       "none",                 BOND_FOM_NONE},
 243 {       "active",               BOND_FOM_ACTIVE},
 244 {       "follow",               BOND_FOM_FOLLOW},
 245 {       NULL,                   -1},
 246 };
 247
 248 const struct bond_parm_tbl pri_reselect_tbl[] = {
 249 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 250 {       "better",               BOND_PRI_RESELECT_BETTER},
 251 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 252 {       NULL,                   -1},
 253 };
 254
 255 struct bond_parm_tbl ad_select_tbl[] = {
 256 {       "stable",       BOND_AD_STABLE},
 257 {       "bandwidth",    BOND_AD_BANDWIDTH},
 258 {       "count",        BOND_AD_COUNT},
 259 {       NULL,           -1},
 260 };
 261
 262 /*-------------------------- Forward declarations ---------------------------*/
 263
 264 static int bond_init(struct net_device *bond_dev);
 265 static void bond_uninit(struct net_device *bond_dev);
 266
 267 /*---------------------------- General routines -----------------------------*/
 268
 269 const char *bond_mode_name(int mode)
 270 {
 271         static const char *names[] = {
 272                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 273                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 274                 [BOND_MODE_XOR] = "load balancing (xor)",
 275                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 276                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 277                 [BOND_MODE_TLB] = "transmit load balancing",
 278                 [BOND_MODE_ALB] = "adaptive load balancing",
 279         };
 280
 281         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 282                 return "unknown";
 283
 284         return names[mode];
 285 }
 286
 287 /*---------------------------------- VLAN -----------------------------------*/
 288
 289 /**
 290  * bond_dev_queue_xmit - Prepare skb for xmit.
 291  *
 292  * @bond: bond device that got this skb for tx.
 293  * @skb: hw accel VLAN tagged skb to transmit
 294  * @slave_dev: slave that is supposed to xmit this skbuff
 295  */
 296 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 297                         struct net_device *slave_dev)
 298 {
 299         skb->dev = slave_dev;
 300
 301         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 302                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 303         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
 304
 305         if (unlikely(netpoll_tx_running(bond->dev)))
 306                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 307         else
 308                 dev_queue_xmit(skb);
 309
 310         return 0;
 311 }
 312
 313 /*
 314  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 315  * We don't protect the slave list iteration with a lock because:
 316  * a. This operation is performed in IOCTL context,
 317  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 318  * c. Holding a lock with BH disabled while directly calling a base driver
 319  *    entry point is generally a BAD idea.
 320  *
 321  * The design of synchronization/protection for this operation in the 8021q
 322  * module is good for one or more VLAN devices over a single physical device
 323  * and cannot be extended for a teaming solution like bonding, so there is a
 324  * potential race condition here where a net device from the vlan group might
 325  * be referenced (either by a base driver or the 8021q code) while it is being
 326  * removed from the system. However, it turns out we're not making matters
 327  * worse, and if it works for regular VLAN usage it will work here too.
 328 */
 329
 330 /**
 331  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 332  * @bond_dev: bonding net device that got called
 333  * @vid: vlan id being added
 334  */
 335 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 336                                 __be16 proto, u16 vid)
 337 {
 338         struct bonding *bond = netdev_priv(bond_dev);
 339         struct slave *slave, *rollback_slave;
 340         struct list_head *iter;
 341         int res;
 342
 343         bond_for_each_slave(bond, slave, iter) {
 344                 res = vlan_vid_add(slave->dev, proto, vid);
 345                 if (res)
 346                         goto unwind;
 347         }
 348
 349         return 0;
 350
 351 unwind:
 352         /* unwind to the slave that failed */
 353         bond_for_each_slave(bond, rollback_slave, iter) {
 354                 if (rollback_slave == slave)
 355                         break;
 356
 357                 vlan_vid_del(rollback_slave->dev, proto, vid);
 358         }
 359
 360         return res;
 361 }
 362
 363 /**
 364  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 365  * @bond_dev: bonding net device that got called
 366  * @vid: vlan id being removed
 367  */
 368 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 369                                  __be16 proto, u16 vid)
 370 {
 371         struct bonding *bond = netdev_priv(bond_dev);
 372         struct list_head *iter;
 373         struct slave *slave;
 374
 375         bond_for_each_slave(bond, slave, iter)
 376                 vlan_vid_del(slave->dev, proto, vid);
 377
 378         if (bond_is_lb(bond))
 379                 bond_alb_clear_vlan(bond, vid);
 380
 381         return 0;
 382 }
 383
 384 /*------------------------------- Link status -------------------------------*/
 385
 386 /*
 387  * Set the carrier state for the master according to the state of its
 388  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 389  * do special 802.3ad magic.
 390  *
 391  * Returns zero if carrier state does not change, nonzero if it does.
 392  */
 393 static int bond_set_carrier(struct bonding *bond)
 394 {
 395         struct list_head *iter;
 396         struct slave *slave;
 397
 398         if (!bond_has_slaves(bond))
 399                 goto down;
 400
 401         if (bond->params.mode == BOND_MODE_8023AD)
 402                 return bond_3ad_set_carrier(bond);
 403
 404         bond_for_each_slave(bond, slave, iter) {
 405                 if (slave->link == BOND_LINK_UP) {
 406                         if (!netif_carrier_ok(bond->dev)) {
 407                                 netif_carrier_on(bond->dev);
 408                                 return 1;
 409                         }
 410                         return 0;
 411                 }
 412         }
 413
 414 down:
 415         if (netif_carrier_ok(bond->dev)) {
 416                 netif_carrier_off(bond->dev);
 417                 return 1;
 418         }
 419         return 0;
 420 }
 421
 422 /*
 423  * Get link speed and duplex from the slave's base driver
 424  * using ethtool. If for some reason the call fails or the
 425  * values are invalid, set speed and duplex to -1,
 426  * and return.
 427  */
 428 static void bond_update_speed_duplex(struct slave *slave)
 429 {
 430         struct net_device *slave_dev = slave->dev;
 431         struct ethtool_cmd ecmd;
 432         u32 slave_speed;
 433         int res;
 434
 435         slave->speed = SPEED_UNKNOWN;
 436         slave->duplex = DUPLEX_UNKNOWN;
 437
 438         res = __ethtool_get_settings(slave_dev, &ecmd);
 439         if (res < 0)
 440                 return;
 441
 442         slave_speed = ethtool_cmd_speed(&ecmd);
 443         if (slave_speed == 0 || slave_speed == ((__u32) -1))
 444                 return;
 445
 446         switch (ecmd.duplex) {
 447         case DUPLEX_FULL:
 448         case DUPLEX_HALF:
 449                 break;
 450         default:
 451                 return;
 452         }
 453
 454         slave->speed = slave_speed;
 455         slave->duplex = ecmd.duplex;
 456
 457         return;
 458 }
 459
 460 /*
 461  * if <dev> supports MII link status reporting, check its link status.
 462  *
 463  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 464  * depending upon the setting of the use_carrier parameter.
 465  *
 466  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 467  * can't tell and just pretend it is), or 0, meaning that the link is
 468  * down.
 469  *
 470  * If reporting is non-zero, instead of faking link up, return -1 if
 471  * both ETHTOOL and MII ioctls fail (meaning the device does not
 472  * support them).  If use_carrier is set, return whatever it says.
 473  * It'd be nice if there was a good way to tell if a driver supports
 474  * netif_carrier, but there really isn't.
 475  */
 476 static int bond_check_dev_link(struct bonding *bond,
 477                                struct net_device *slave_dev, int reporting)
 478 {
 479         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 480         int (*ioctl)(struct net_device *, struct ifreq *, int);
 481         struct ifreq ifr;
 482         struct mii_ioctl_data *mii;
 483
 484         if (!reporting && !netif_running(slave_dev))
 485                 return 0;
 486
 487         if (bond->params.use_carrier)
 488                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 489
 490         /* Try to get link status using Ethtool first. */
 491         if (slave_dev->ethtool_ops->get_link)
 492                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 493                         BMSR_LSTATUS : 0;
 494
 495         /* Ethtool can't be used, fallback to MII ioctls. */
 496         ioctl = slave_ops->ndo_do_ioctl;
 497         if (ioctl) {
 498                 /* TODO: set pointer to correct ioctl on a per team member */
 499                 /*       bases to make this more efficient. that is, once  */
 500                 /*       we determine the correct ioctl, we will always    */
 501                 /*       call it and not the others for that team          */
 502                 /*       member.                                           */
 503
 504                 /*
 505                  * We cannot assume that SIOCGMIIPHY will also read a
 506                  * register; not all network drivers (e.g., e100)
 507                  * support that.
 508                  */
 509
 510                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 511                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 512                 mii = if_mii(&ifr);
 513                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 514                         mii->reg_num = MII_BMSR;
 515                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 516                                 return mii->val_out & BMSR_LSTATUS;
 517                 }
 518         }
 519
 520         /*
 521          * If reporting, report that either there's no dev->do_ioctl,
 522          * or both SIOCGMIIREG and get_link failed (meaning that we
 523          * cannot report link status).  If not reporting, pretend
 524          * we're ok.
 525          */
 526         return reporting ? -1 : BMSR_LSTATUS;
 527 }
 528
 529 /*----------------------------- Multicast list ------------------------------*/
 530
 531 /*
 532  * Push the promiscuity flag down to appropriate slaves
 533  */
 534 static int bond_set_promiscuity(struct bonding *bond, int inc)
 535 {
 536         struct list_head *iter;
 537         int err = 0;
 538
 539         if (USES_PRIMARY(bond->params.mode)) {
 540                 /* write lock already acquired */
 541                 if (bond->curr_active_slave) {
 542                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 543                                                   inc);
 544                 }
 545         } else {
 546                 struct slave *slave;
 547
 548                 bond_for_each_slave(bond, slave, iter) {
 549                         err = dev_set_promiscuity(slave->dev, inc);
 550                         if (err)
 551                                 return err;
 552                 }
 553         }
 554         return err;
 555 }
 556
 557 /*
 558  * Push the allmulti flag down to all slaves
 559  */
 560 static int bond_set_allmulti(struct bonding *bond, int inc)
 561 {
 562         struct list_head *iter;
 563         int err = 0;
 564
 565         if (USES_PRIMARY(bond->params.mode)) {
 566                 /* write lock already acquired */
 567                 if (bond->curr_active_slave) {
 568                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 569                                                inc);
 570                 }
 571         } else {
 572                 struct slave *slave;
 573
 574                 bond_for_each_slave(bond, slave, iter) {
 575                         err = dev_set_allmulti(slave->dev, inc);
 576                         if (err)
 577                                 return err;
 578                 }
 579         }
 580         return err;
 581 }
 582
 583 /*
 584  * Retrieve the list of registered multicast addresses for the bonding
 585  * device and retransmit an IGMP JOIN request to the current active
 586  * slave.
 587  */
 588 static void bond_resend_igmp_join_requests(struct bonding *bond)
 589 {
 590         if (!rtnl_trylock()) {
 591                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 592                 return;
 593         }
 594         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 595         rtnl_unlock();
 596
 597         /* We use curr_slave_lock to protect against concurrent access to
 598          * igmp_retrans from multiple running instances of this function and
 599          * bond_change_active_slave
 600          */
 601         write_lock_bh(&bond->curr_slave_lock);
 602         if (bond->igmp_retrans > 1) {
 603                 bond->igmp_retrans--;
 604                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 605         }
 606         write_unlock_bh(&bond->curr_slave_lock);
 607 }
 608
 609 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 610 {
 611         struct bonding *bond = container_of(work, struct bonding,
 612                                             mcast_work.work);
 613
 614         bond_resend_igmp_join_requests(bond);
 615 }
 616
 617 /* Flush bond's hardware addresses from slave
 618  */
 619 static void bond_hw_addr_flush(struct net_device *bond_dev,
 620                                struct net_device *slave_dev)
 621 {
 622         struct bonding *bond = netdev_priv(bond_dev);
 623
 624         dev_uc_unsync(slave_dev, bond_dev);
 625         dev_mc_unsync(slave_dev, bond_dev);
 626
 627         if (bond->params.mode == BOND_MODE_8023AD) {
 628                 /* del lacpdu mc addr from mc list */
 629                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 630
 631                 dev_mc_del(slave_dev, lacpdu_multicast);
 632         }
 633 }
 634
 635 /*--------------------------- Active slave change ---------------------------*/
 636
 637 /* Update the hardware address list and promisc/allmulti for the new and
 638  * old active slaves (if any).  Modes that are !USES_PRIMARY keep all
 639  * slaves up date at all times; only the USES_PRIMARY modes need to call
 640  * this function to swap these settings during a failover.
 641  */
 642 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 643                               struct slave *old_active)
 644 {
 645         ASSERT_RTNL();
 646
 647         if (old_active) {
 648                 if (bond->dev->flags & IFF_PROMISC)
 649                         dev_set_promiscuity(old_active->dev, -1);
 650
 651                 if (bond->dev->flags & IFF_ALLMULTI)
 652                         dev_set_allmulti(old_active->dev, -1);
 653
 654                 bond_hw_addr_flush(bond->dev, old_active->dev);
 655         }
 656
 657         if (new_active) {
 658                 /* FIXME: Signal errors upstream. */
 659                 if (bond->dev->flags & IFF_PROMISC)
 660                         dev_set_promiscuity(new_active->dev, 1);
 661
 662                 if (bond->dev->flags & IFF_ALLMULTI)
 663                         dev_set_allmulti(new_active->dev, 1);
 664
 665                 netif_addr_lock_bh(bond->dev);
 666                 dev_uc_sync(new_active->dev, bond->dev);
 667                 dev_mc_sync(new_active->dev, bond->dev);
 668                 netif_addr_unlock_bh(bond->dev);
 669         }
 670 }
 671
 672 /**
 673  * bond_set_dev_addr - clone slave's address to bond
 674  * @bond_dev: bond net device
 675  * @slave_dev: slave net device
 676  *
 677  * Should be called with RTNL held.
 678  */
 679 static void bond_set_dev_addr(struct net_device *bond_dev,
 680                               struct net_device *slave_dev)
 681 {
 682         pr_debug("bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 683                  bond_dev, slave_dev, slave_dev->addr_len);
 684         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 685         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 686         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 687 }
 688
 689 /*
 690  * bond_do_fail_over_mac
 691  *
 692  * Perform special MAC address swapping for fail_over_mac settings
 693  *
 694  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 695  */
 696 static void bond_do_fail_over_mac(struct bonding *bond,
 697                                   struct slave *new_active,
 698                                   struct slave *old_active)
 699         __releases(&bond->curr_slave_lock)
 700         __releases(&bond->lock)
 701         __acquires(&bond->lock)
 702         __acquires(&bond->curr_slave_lock)
 703 {
 704         u8 tmp_mac[ETH_ALEN];
 705         struct sockaddr saddr;
 706         int rv;
 707
 708         switch (bond->params.fail_over_mac) {
 709         case BOND_FOM_ACTIVE:
 710                 if (new_active) {
 711                         write_unlock_bh(&bond->curr_slave_lock);
 712                         read_unlock(&bond->lock);
 713                         bond_set_dev_addr(bond->dev, new_active->dev);
 714                         read_lock(&bond->lock);
 715                         write_lock_bh(&bond->curr_slave_lock);
 716                 }
 717                 break;
 718         case BOND_FOM_FOLLOW:
 719                 /*
 720                  * if new_active && old_active, swap them
 721                  * if just old_active, do nothing (going to no active slave)
 722                  * if just new_active, set new_active to bond's MAC
 723                  */
 724                 if (!new_active)
 725                         return;
 726
 727                 write_unlock_bh(&bond->curr_slave_lock);
 728                 read_unlock(&bond->lock);
 729
 730                 if (old_active) {
 731                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
 732                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
 733                                ETH_ALEN);
 734                         saddr.sa_family = new_active->dev->type;
 735                 } else {
 736                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
 737                         saddr.sa_family = bond->dev->type;
 738                 }
 739
 740                 rv = dev_set_mac_address(new_active->dev, &saddr);
 741                 if (rv) {
 742                         pr_err("%s: Error %d setting MAC of slave %s\n",
 743                                bond->dev->name, -rv, new_active->dev->name);
 744                         goto out;
 745                 }
 746
 747                 if (!old_active)
 748                         goto out;
 749
 750                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
 751                 saddr.sa_family = old_active->dev->type;
 752
 753                 rv = dev_set_mac_address(old_active->dev, &saddr);
 754                 if (rv)
 755                         pr_err("%s: Error %d setting MAC of slave %s\n",
 756                                bond->dev->name, -rv, new_active->dev->name);
 757 out:
 758                 read_lock(&bond->lock);
 759                 write_lock_bh(&bond->curr_slave_lock);
 760                 break;
 761         default:
 762                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
 763                        bond->dev->name, bond->params.fail_over_mac);
 764                 break;
 765         }
 766
 767 }
 768
 769 static bool bond_should_change_active(struct bonding *bond)
 770 {
 771         struct slave *prim = bond->primary_slave;
 772         struct slave *curr = bond->curr_active_slave;
 773
 774         if (!prim || !curr || curr->link != BOND_LINK_UP)
 775                 return true;
 776         if (bond->force_primary) {
 777                 bond->force_primary = false;
 778                 return true;
 779         }
 780         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
 781             (prim->speed < curr->speed ||
 782              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
 783                 return false;
 784         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
 785                 return false;
 786         return true;
 787 }
 788
 789 /**
 790  * find_best_interface - select the best available slave to be the active one
 791  * @bond: our bonding struct
 792  */
 793 static struct slave *bond_find_best_slave(struct bonding *bond)
 794 {
 795         struct slave *slave, *bestslave = NULL;
 796         struct list_head *iter;
 797         int mintime = bond->params.updelay;
 798
 799         if (bond->primary_slave && bond->primary_slave->link == BOND_LINK_UP &&
 800             bond_should_change_active(bond))
 801                 return bond->primary_slave;
 802
 803         bond_for_each_slave(bond, slave, iter) {
 804                 if (slave->link == BOND_LINK_UP)
 805                         return slave;
 806                 if (slave->link == BOND_LINK_BACK && IS_UP(slave->dev) &&
 807                     slave->delay < mintime) {
 808                         mintime = slave->delay;
 809                         bestslave = slave;
 810                 }
 811         }
 812
 813         return bestslave;
 814 }
 815
 816 static bool bond_should_notify_peers(struct bonding *bond)
 817 {
 818         struct slave *slave = bond->curr_active_slave;
 819
 820         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
 821                  bond->dev->name, slave ? slave->dev->name : "NULL");
 822
 823         if (!slave || !bond->send_peer_notif ||
 824             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 825                 return false;
 826
 827         return true;
 828 }
 829
 830 /**
 831  * change_active_interface - change the active slave into the specified one
 832  * @bond: our bonding struct
 833  * @new: the new slave to make the active one
 834  *
 835  * Set the new slave to the bond's settings and unset them on the old
 836  * curr_active_slave.
 837  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 838  *
 839  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 840  * because it is apparently the best available slave we have, even though its
 841  * updelay hasn't timed out yet.
 842  *
 843  * If new_active is not NULL, caller must hold bond->lock for read and
 844  * curr_slave_lock for write_bh.
 845  */
 846 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 847 {
 848         struct slave *old_active = bond->curr_active_slave;
 849
 850         if (old_active == new_active)
 851                 return;
 852
 853         if (new_active) {
 854                 new_active->jiffies = jiffies;
 855
 856                 if (new_active->link == BOND_LINK_BACK) {
 857                         if (USES_PRIMARY(bond->params.mode)) {
 858                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
 859                                         bond->dev->name, new_active->dev->name,
 860                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
 861                         }
 862
 863                         new_active->delay = 0;
 864                         new_active->link = BOND_LINK_UP;
 865
 866                         if (bond->params.mode == BOND_MODE_8023AD)
 867                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 868
 869                         if (bond_is_lb(bond))
 870                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 871                 } else {
 872                         if (USES_PRIMARY(bond->params.mode)) {
 873                                 pr_info("%s: making interface %s the new active one.\n",
 874                                         bond->dev->name, new_active->dev->name);
 875                         }
 876                 }
 877         }
 878
 879         if (USES_PRIMARY(bond->params.mode))
 880                 bond_hw_addr_swap(bond, new_active, old_active);
 881
 882         if (bond_is_lb(bond)) {
 883                 bond_alb_handle_active_change(bond, new_active);
 884                 if (old_active)
 885                         bond_set_slave_inactive_flags(old_active);
 886                 if (new_active)
 887                         bond_set_slave_active_flags(new_active);
 888         } else {
 889                 rcu_assign_pointer(bond->curr_active_slave, new_active);
 890         }
 891
 892         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
 893                 if (old_active)
 894                         bond_set_slave_inactive_flags(old_active);
 895
 896                 if (new_active) {
 897                         bool should_notify_peers = false;
 898
 899                         bond_set_slave_active_flags(new_active);
 900
 901                         if (bond->params.fail_over_mac)
 902                                 bond_do_fail_over_mac(bond, new_active,
 903                                                       old_active);
 904
 905                         if (netif_running(bond->dev)) {
 906                                 bond->send_peer_notif =
 907                                         bond->params.num_peer_notif;
 908                                 should_notify_peers =
 909                                         bond_should_notify_peers(bond);
 910                         }
 911
 912                         write_unlock_bh(&bond->curr_slave_lock);
 913                         read_unlock(&bond->lock);
 914
 915                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 916                         if (should_notify_peers)
 917                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 918                                                          bond->dev);
 919
 920                         read_lock(&bond->lock);
 921                         write_lock_bh(&bond->curr_slave_lock);
 922                 }
 923         }
 924
 925         /* resend IGMP joins since active slave has changed or
 926          * all were sent on curr_active_slave.
 927          * resend only if bond is brought up with the affected
 928          * bonding modes and the retransmission is enabled */
 929         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 930             ((USES_PRIMARY(bond->params.mode) && new_active) ||
 931              bond->params.mode == BOND_MODE_ROUNDROBIN)) {
 932                 bond->igmp_retrans = bond->params.resend_igmp;
 933                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 934         }
 935 }
 936
 937 /**
 938  * bond_select_active_slave - select a new active slave, if needed
 939  * @bond: our bonding struct
 940  *
 941  * This functions should be called when one of the following occurs:
 942  * - The old curr_active_slave has been released or lost its link.
 943  * - The primary_slave has got its link back.
 944  * - A slave has got its link back and there's no old curr_active_slave.
 945  *
 946  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
 947  */
 948 void bond_select_active_slave(struct bonding *bond)
 949 {
 950         struct slave *best_slave;
 951         int rv;
 952
 953         best_slave = bond_find_best_slave(bond);
 954         if (best_slave != bond->curr_active_slave) {
 955                 bond_change_active_slave(bond, best_slave);
 956                 rv = bond_set_carrier(bond);
 957                 if (!rv)
 958                         return;
 959
 960                 if (netif_carrier_ok(bond->dev)) {
 961                         pr_info("%s: first active interface up!\n",
 962                                 bond->dev->name);
 963                 } else {
 964                         pr_info("%s: now running without any active interface !\n",
 965                                 bond->dev->name);
 966                 }
 967         }
 968 }
 969
 970 /*--------------------------- slave list handling ---------------------------*/
 971
 972 /*
 973  * This function attaches the slave to the end of list.
 974  *
 975  * bond->lock held for writing by caller.
 976  */
 977 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
 978 {
 979         bond->slave_cnt++;
 980 }
 981
 982 /*
 983  * This function detaches the slave from the list.
 984  * WARNING: no check is made to verify if the slave effectively
 985  * belongs to <bond>.
 986  * Nothing is freed on return, structures are just unchained.
 987  * If any slave pointer in bond was pointing to <slave>,
 988  * it should be changed by the calling function.
 989  *
 990  * bond->lock held for writing by caller.
 991  */
 992 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
 993 {
 994         bond->slave_cnt--;
 995 }
 996
 997 #ifdef CONFIG_NET_POLL_CONTROLLER
 998 static inline int slave_enable_netpoll(struct slave *slave)
 999 {
1000         struct netpoll *np;
1001         int err = 0;
1002
1003         np = kzalloc(sizeof(*np), GFP_ATOMIC);
1004         err = -ENOMEM;
1005         if (!np)
1006                 goto out;
1007
1008         err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
1009         if (err) {
1010                 kfree(np);
1011                 goto out;
1012         }
1013         slave->np = np;
1014 out:
1015         return err;
1016 }
1017 static inline void slave_disable_netpoll(struct slave *slave)
1018 {
1019         struct netpoll *np = slave->np;
1020
1021         if (!np)
1022                 return;
1023
1024         slave->np = NULL;
1025         __netpoll_free_async(np);
1026 }
1027 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1028 {
1029         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1030                 return false;
1031         if (!slave_dev->netdev_ops->ndo_poll_controller)
1032                 return false;
1033         return true;
1034 }
1035
1036 static void bond_poll_controller(struct net_device *bond_dev)
1037 {
1038 }
1039
1040 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1041 {
1042         struct bonding *bond = netdev_priv(bond_dev);
1043         struct list_head *iter;
1044         struct slave *slave;
1045
1046         bond_for_each_slave(bond, slave, iter)
1047                 if (IS_UP(slave->dev))
1048                         slave_disable_netpoll(slave);
1049 }
1050
1051 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
1052 {
1053         struct bonding *bond = netdev_priv(dev);
1054         struct list_head *iter;
1055         struct slave *slave;
1056         int err = 0;
1057
1058         bond_for_each_slave(bond, slave, iter) {
1059                 err = slave_enable_netpoll(slave);
1060                 if (err) {
1061                         bond_netpoll_cleanup(dev);
1062                         break;
1063                 }
1064         }
1065         return err;
1066 }
1067 #else
1068 static inline int slave_enable_netpoll(struct slave *slave)
1069 {
1070         return 0;
1071 }
1072 static inline void slave_disable_netpoll(struct slave *slave)
1073 {
1074 }
1075 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1076 {
1077 }
1078 #endif
1079
1080 /*---------------------------------- IOCTL ----------------------------------*/
1081
1082 static netdev_features_t bond_fix_features(struct net_device *dev,
1083                                            netdev_features_t features)
1084 {
1085         struct bonding *bond = netdev_priv(dev);
1086         struct list_head *iter;
1087         netdev_features_t mask;
1088         struct slave *slave;
1089
1090         if (!bond_has_slaves(bond)) {
1091                 /* Disable adding VLANs to empty bond. But why? --mq */
1092                 features |= NETIF_F_VLAN_CHALLENGED;
1093                 return features;
1094         }
1095
1096         mask = features;
1097         features &= ~NETIF_F_ONE_FOR_ALL;
1098         features |= NETIF_F_ALL_FOR_ALL;
1099
1100         bond_for_each_slave(bond, slave, iter) {
1101                 features = netdev_increment_features(features,
1102                                                      slave->dev->features,
1103                                                      mask);
1104         }
1105         features = netdev_add_tso_features(features, mask);
1106
1107         return features;
1108 }
1109
1110 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1111                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1112                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1113
1114 static void bond_compute_features(struct bonding *bond)
1115 {
1116         unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1117         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1118         struct net_device *bond_dev = bond->dev;
1119         struct list_head *iter;
1120         struct slave *slave;
1121         unsigned short max_hard_header_len = ETH_HLEN;
1122         unsigned int gso_max_size = GSO_MAX_SIZE;
1123         u16 gso_max_segs = GSO_MAX_SEGS;
1124
1125         if (!bond_has_slaves(bond))
1126                 goto done;
1127
1128         bond_for_each_slave(bond, slave, iter) {
1129                 vlan_features = netdev_increment_features(vlan_features,
1130                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1131
1132                 dst_release_flag &= slave->dev->priv_flags;
1133                 if (slave->dev->hard_header_len > max_hard_header_len)
1134                         max_hard_header_len = slave->dev->hard_header_len;
1135
1136                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1137                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1138         }
1139
1140 done:
1141         bond_dev->vlan_features = vlan_features;
1142         bond_dev->hard_header_len = max_hard_header_len;
1143         bond_dev->gso_max_segs = gso_max_segs;
1144         netif_set_gso_max_size(bond_dev, gso_max_size);
1145
1146         flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1147         bond_dev->priv_flags = flags | dst_release_flag;
1148
1149         netdev_change_features(bond_dev);
1150 }
1151
1152 static void bond_setup_by_slave(struct net_device *bond_dev,
1153                                 struct net_device *slave_dev)
1154 {
1155         bond_dev->header_ops        = slave_dev->header_ops;
1156
1157         bond_dev->type              = slave_dev->type;
1158         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1159         bond_dev->addr_len          = slave_dev->addr_len;
1160
1161         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1162                 slave_dev->addr_len);
1163 }
1164
1165 /* On bonding slaves other than the currently active slave, suppress
1166  * duplicates except for alb non-mcast/bcast.
1167  */
1168 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1169                                             struct slave *slave,
1170                                             struct bonding *bond)
1171 {
1172         if (bond_is_slave_inactive(slave)) {
1173                 if (bond->params.mode == BOND_MODE_ALB &&
1174                     skb->pkt_type != PACKET_BROADCAST &&
1175                     skb->pkt_type != PACKET_MULTICAST)
1176                         return false;
1177                 return true;
1178         }
1179         return false;
1180 }
1181
1182 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1183 {
1184         struct sk_buff *skb = *pskb;
1185         struct slave *slave;
1186         struct bonding *bond;
1187         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1188                           struct slave *);
1189         int ret = RX_HANDLER_ANOTHER;
1190
1191         skb = skb_share_check(skb, GFP_ATOMIC);
1192         if (unlikely(!skb))
1193                 return RX_HANDLER_CONSUMED;
1194
1195         *pskb = skb;
1196
1197         slave = bond_slave_get_rcu(skb->dev);
1198         bond = slave->bond;
1199
1200         if (bond->params.arp_interval)
1201                 slave->dev->last_rx = jiffies;
1202
1203         recv_probe = ACCESS_ONCE(bond->recv_probe);
1204         if (recv_probe) {
1205                 ret = recv_probe(skb, bond, slave);
1206                 if (ret == RX_HANDLER_CONSUMED) {
1207                         consume_skb(skb);
1208                         return ret;
1209                 }
1210         }
1211
1212         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1213                 return RX_HANDLER_EXACT;
1214         }
1215
1216         skb->dev = bond->dev;
1217
1218         if (bond->params.mode == BOND_MODE_ALB &&
1219             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1220             skb->pkt_type == PACKET_HOST) {
1221
1222                 if (unlikely(skb_cow_head(skb,
1223                                           skb->data - skb_mac_header(skb)))) {
1224                         kfree_skb(skb);
1225                         return RX_HANDLER_CONSUMED;
1226                 }
1227                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1228         }
1229
1230         return ret;
1231 }
1232
1233 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1234                                       struct net_device *slave_dev,
1235                                       struct slave *slave)
1236 {
1237         int err;
1238
1239         err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1240         if (err)
1241                 return err;
1242         slave_dev->flags |= IFF_SLAVE;
1243         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1244         return 0;
1245 }
1246
1247 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1248                                   struct net_device *slave_dev)
1249 {
1250         netdev_upper_dev_unlink(slave_dev, bond_dev);
1251         slave_dev->flags &= ~IFF_SLAVE;
1252         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1253 }
1254
1255 /* enslave device <slave> to bond device <master> */
1256 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1257 {
1258         struct bonding *bond = netdev_priv(bond_dev);
1259         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1260         struct slave *new_slave = NULL, *prev_slave;
1261         struct sockaddr addr;
1262         int link_reporting;
1263         int res = 0, i;
1264
1265         if (!bond->params.use_carrier &&
1266             slave_dev->ethtool_ops->get_link == NULL &&
1267             slave_ops->ndo_do_ioctl == NULL) {
1268                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1269                            bond_dev->name, slave_dev->name);
1270         }
1271
1272         /* already enslaved */
1273         if (slave_dev->flags & IFF_SLAVE) {
1274                 pr_debug("Error, Device was already enslaved\n");
1275                 return -EBUSY;
1276         }
1277
1278         /* vlan challenged mutual exclusion */
1279         /* no need to lock since we're protected by rtnl_lock */
1280         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1281                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1282                 if (vlan_uses_dev(bond_dev)) {
1283                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1284                                bond_dev->name, slave_dev->name, bond_dev->name);
1285                         return -EPERM;
1286                 } else {
1287                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1288                                    bond_dev->name, slave_dev->name,
1289                                    slave_dev->name, bond_dev->name);
1290                 }
1291         } else {
1292                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1293         }
1294
1295         /*
1296          * Old ifenslave binaries are no longer supported.  These can
1297          * be identified with moderate accuracy by the state of the slave:
1298          * the current ifenslave will set the interface down prior to
1299          * enslaving it; the old ifenslave will not.
1300          */
1301         if ((slave_dev->flags & IFF_UP)) {
1302                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1303                        slave_dev->name);
1304                 res = -EPERM;
1305                 goto err_undo_flags;
1306         }
1307
1308         /* set bonding device ether type by slave - bonding netdevices are
1309          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1310          * there is a need to override some of the type dependent attribs/funcs.
1311          *
1312          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1313          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1314          */
1315         if (!bond_has_slaves(bond)) {
1316                 if (bond_dev->type != slave_dev->type) {
1317                         pr_debug("%s: change device type from %d to %d\n",
1318                                  bond_dev->name,
1319                                  bond_dev->type, slave_dev->type);
1320
1321                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1322                                                        bond_dev);
1323                         res = notifier_to_errno(res);
1324                         if (res) {
1325                                 pr_err("%s: refused to change device type\n",
1326                                        bond_dev->name);
1327                                 res = -EBUSY;
1328                                 goto err_undo_flags;
1329                         }
1330
1331                         /* Flush unicast and multicast addresses */
1332                         dev_uc_flush(bond_dev);
1333                         dev_mc_flush(bond_dev);
1334
1335                         if (slave_dev->type != ARPHRD_ETHER)
1336                                 bond_setup_by_slave(bond_dev, slave_dev);
1337                         else {
1338                                 ether_setup(bond_dev);
1339                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1340                         }
1341
1342                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1343                                                  bond_dev);
1344                 }
1345         } else if (bond_dev->type != slave_dev->type) {
1346                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1347                        slave_dev->name,
1348                        slave_dev->type, bond_dev->type);
1349                 res = -EINVAL;
1350                 goto err_undo_flags;
1351         }
1352
1353         if (slave_ops->ndo_set_mac_address == NULL) {
1354                 if (!bond_has_slaves(bond)) {
1355                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1356                                    bond_dev->name);
1357                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1358                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1359                         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",
1360                                bond_dev->name);
1361                         res = -EOPNOTSUPP;
1362                         goto err_undo_flags;
1363                 }
1364         }
1365
1366         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1367
1368         /* If this is the first slave, then we need to set the master's hardware
1369          * address to be the same as the slave's. */
1370         if (!bond_has_slaves(bond) &&
1371             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1372                 bond_set_dev_addr(bond->dev, slave_dev);
1373
1374         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1375         if (!new_slave) {
1376                 res = -ENOMEM;
1377                 goto err_undo_flags;
1378         }
1379         /*
1380          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1381          * is set via sysfs or module option if desired.
1382          */
1383         new_slave->queue_id = 0;
1384
1385         /* Save slave's original mtu and then set it to match the bond */
1386         new_slave->original_mtu = slave_dev->mtu;
1387         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1388         if (res) {
1389                 pr_debug("Error %d calling dev_set_mtu\n", res);
1390                 goto err_free;
1391         }
1392
1393         /*
1394          * Save slave's original ("permanent") mac address for modes
1395          * that need it, and for restoring it upon release, and then
1396          * set it to the master's address
1397          */
1398         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1399
1400         if (!bond->params.fail_over_mac) {
1401                 /*
1402                  * Set slave to master's mac address.  The application already
1403                  * set the master's mac address to that of the first slave
1404                  */
1405                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1406                 addr.sa_family = slave_dev->type;
1407                 res = dev_set_mac_address(slave_dev, &addr);
1408                 if (res) {
1409                         pr_debug("Error %d calling set_mac_address\n", res);
1410                         goto err_restore_mtu;
1411                 }
1412         }
1413
1414         /* open the slave since the application closed it */
1415         res = dev_open(slave_dev);
1416         if (res) {
1417                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1418                 goto err_restore_mac;
1419         }
1420
1421         new_slave->bond = bond;
1422         new_slave->dev = slave_dev;
1423         slave_dev->priv_flags |= IFF_BONDING;
1424
1425         if (bond_is_lb(bond)) {
1426                 /* bond_alb_init_slave() must be called before all other stages since
1427                  * it might fail and we do not want to have to undo everything
1428                  */
1429                 res = bond_alb_init_slave(bond, new_slave);
1430                 if (res)
1431                         goto err_close;
1432         }
1433
1434         /* If the mode USES_PRIMARY, then the following is handled by
1435          * bond_change_active_slave().
1436          */
1437         if (!USES_PRIMARY(bond->params.mode)) {
1438                 /* set promiscuity level to new slave */
1439                 if (bond_dev->flags & IFF_PROMISC) {
1440                         res = dev_set_promiscuity(slave_dev, 1);
1441                         if (res)
1442                                 goto err_close;
1443                 }
1444
1445                 /* set allmulti level to new slave */
1446                 if (bond_dev->flags & IFF_ALLMULTI) {
1447                         res = dev_set_allmulti(slave_dev, 1);
1448                         if (res)
1449                                 goto err_close;
1450                 }
1451
1452                 netif_addr_lock_bh(bond_dev);
1453
1454                 dev_mc_sync_multiple(slave_dev, bond_dev);
1455                 dev_uc_sync_multiple(slave_dev, bond_dev);
1456
1457                 netif_addr_unlock_bh(bond_dev);
1458         }
1459
1460         if (bond->params.mode == BOND_MODE_8023AD) {
1461                 /* add lacpdu mc addr to mc list */
1462                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1463
1464                 dev_mc_add(slave_dev, lacpdu_multicast);
1465         }
1466
1467         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1468         if (res) {
1469                 pr_err("%s: Error: Couldn't add bond vlan ids to %s\n",
1470                        bond_dev->name, slave_dev->name);
1471                 goto err_close;
1472         }
1473
1474         write_lock_bh(&bond->lock);
1475
1476         prev_slave = bond_last_slave(bond);
1477         bond_attach_slave(bond, new_slave);
1478
1479         new_slave->delay = 0;
1480         new_slave->link_failure_count = 0;
1481
1482         write_unlock_bh(&bond->lock);
1483
1484         bond_compute_features(bond);
1485
1486         bond_update_speed_duplex(new_slave);
1487
1488         read_lock(&bond->lock);
1489
1490         new_slave->last_arp_rx = jiffies -
1491                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1492         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1493                 new_slave->target_last_arp_rx[i] = new_slave->last_arp_rx;
1494
1495         if (bond->params.miimon && !bond->params.use_carrier) {
1496                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1497
1498                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1499                         /*
1500                          * miimon is set but a bonded network driver
1501                          * does not support ETHTOOL/MII and
1502                          * arp_interval is not set.  Note: if
1503                          * use_carrier is enabled, we will never go
1504                          * here (because netif_carrier is always
1505                          * supported); thus, we don't need to change
1506                          * the messages for netif_carrier.
1507                          */
1508                         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",
1509                                bond_dev->name, slave_dev->name);
1510                 } else if (link_reporting == -1) {
1511                         /* unable get link status using mii/ethtool */
1512                         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",
1513                                    bond_dev->name, slave_dev->name);
1514                 }
1515         }
1516
1517         /* check for initial state */
1518         if (bond->params.miimon) {
1519                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1520                         if (bond->params.updelay) {
1521                                 new_slave->link = BOND_LINK_BACK;
1522                                 new_slave->delay = bond->params.updelay;
1523                         } else {
1524                                 new_slave->link = BOND_LINK_UP;
1525                         }
1526                 } else {
1527                         new_slave->link = BOND_LINK_DOWN;
1528                 }
1529         } else if (bond->params.arp_interval) {
1530                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1531                         BOND_LINK_UP : BOND_LINK_DOWN);
1532         } else {
1533                 new_slave->link = BOND_LINK_UP;
1534         }
1535
1536         if (new_slave->link != BOND_LINK_DOWN)
1537                 new_slave->jiffies = jiffies;
1538         pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1539                 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1540                         (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1541
1542         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1543                 /* if there is a primary slave, remember it */
1544                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1545                         bond->primary_slave = new_slave;
1546                         bond->force_primary = true;
1547                 }
1548         }
1549
1550         write_lock_bh(&bond->curr_slave_lock);
1551
1552         switch (bond->params.mode) {
1553         case BOND_MODE_ACTIVEBACKUP:
1554                 bond_set_slave_inactive_flags(new_slave);
1555                 bond_select_active_slave(bond);
1556                 break;
1557         case BOND_MODE_8023AD:
1558                 /* in 802.3ad mode, the internal mechanism
1559                  * will activate the slaves in the selected
1560                  * aggregator
1561                  */
1562                 bond_set_slave_inactive_flags(new_slave);
1563                 /* if this is the first slave */
1564                 if (!prev_slave) {
1565                         SLAVE_AD_INFO(new_slave).id = 1;
1566                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1567                          * can be called only after the mac address of the bond is set
1568                          */
1569                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1570                 } else {
1571                         SLAVE_AD_INFO(new_slave).id =
1572                                 SLAVE_AD_INFO(prev_slave).id + 1;
1573                 }
1574
1575                 bond_3ad_bind_slave(new_slave);
1576                 break;
1577         case BOND_MODE_TLB:
1578         case BOND_MODE_ALB:
1579                 bond_set_active_slave(new_slave);
1580                 bond_set_slave_inactive_flags(new_slave);
1581                 bond_select_active_slave(bond);
1582                 break;
1583         default:
1584                 pr_debug("This slave is always active in trunk mode\n");
1585
1586                 /* always active in trunk mode */
1587                 bond_set_active_slave(new_slave);
1588
1589                 /* In trunking mode there is little meaning to curr_active_slave
1590                  * anyway (it holds no special properties of the bond device),
1591                  * so we can change it without calling change_active_interface()
1592                  */
1593                 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1594                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1595
1596                 break;
1597         } /* switch(bond_mode) */
1598
1599         write_unlock_bh(&bond->curr_slave_lock);
1600
1601         bond_set_carrier(bond);
1602
1603 #ifdef CONFIG_NET_POLL_CONTROLLER
1604         slave_dev->npinfo = bond->dev->npinfo;
1605         if (slave_dev->npinfo) {
1606                 if (slave_enable_netpoll(new_slave)) {
1607                         read_unlock(&bond->lock);
1608                         pr_info("Error, %s: master_dev is using netpoll, "
1609                                  "but new slave device does not support netpoll.\n",
1610                                  bond_dev->name);
1611                         res = -EBUSY;
1612                         goto err_detach;
1613                 }
1614         }
1615 #endif
1616
1617         read_unlock(&bond->lock);
1618
1619         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1620                                          new_slave);
1621         if (res) {
1622                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1623                 goto err_detach;
1624         }
1625
1626         res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1627         if (res) {
1628                 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1629                 goto err_unregister;
1630         }
1631
1632
1633         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1634                 bond_dev->name, slave_dev->name,
1635                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1636                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1637
1638         /* enslave is successful */
1639         return 0;
1640
1641 /* Undo stages on error */
1642 err_unregister:
1643         netdev_rx_handler_unregister(slave_dev);
1644
1645 err_detach:
1646         if (!USES_PRIMARY(bond->params.mode))
1647                 bond_hw_addr_flush(bond_dev, slave_dev);
1648
1649         vlan_vids_del_by_dev(slave_dev, bond_dev);
1650         write_lock_bh(&bond->lock);
1651         bond_detach_slave(bond, new_slave);
1652         if (bond->primary_slave == new_slave)
1653                 bond->primary_slave = NULL;
1654         if (bond->curr_active_slave == new_slave) {
1655                 bond_change_active_slave(bond, NULL);
1656                 write_unlock_bh(&bond->lock);
1657                 read_lock(&bond->lock);
1658                 write_lock_bh(&bond->curr_slave_lock);
1659                 bond_select_active_slave(bond);
1660                 write_unlock_bh(&bond->curr_slave_lock);
1661                 read_unlock(&bond->lock);
1662         } else {
1663                 write_unlock_bh(&bond->lock);
1664         }
1665         slave_disable_netpoll(new_slave);
1666
1667 err_close:
1668         slave_dev->priv_flags &= ~IFF_BONDING;
1669         dev_close(slave_dev);
1670
1671 err_restore_mac:
1672         if (!bond->params.fail_over_mac) {
1673                 /* XXX TODO - fom follow mode needs to change master's
1674                  * MAC if this slave's MAC is in use by the bond, or at
1675                  * least print a warning.
1676                  */
1677                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1678                 addr.sa_family = slave_dev->type;
1679                 dev_set_mac_address(slave_dev, &addr);
1680         }
1681
1682 err_restore_mtu:
1683         dev_set_mtu(slave_dev, new_slave->original_mtu);
1684
1685 err_free:
1686         kfree(new_slave);
1687
1688 err_undo_flags:
1689         bond_compute_features(bond);
1690         /* Enslave of first slave has failed and we need to fix master's mac */
1691         if (!bond_has_slaves(bond) &&
1692             ether_addr_equal(bond_dev->dev_addr, slave_dev->dev_addr))
1693                 eth_hw_addr_random(bond_dev);
1694
1695         return res;
1696 }
1697
1698 /*
1699  * Try to release the slave device <slave> from the bond device <master>
1700  * It is legal to access curr_active_slave without a lock because all the function
1701  * is write-locked. If "all" is true it means that the function is being called
1702  * while destroying a bond interface and all slaves are being released.
1703  *
1704  * The rules for slave state should be:
1705  *   for Active/Backup:
1706  *     Active stays on all backups go down
1707  *   for Bonded connections:
1708  *     The first up interface should be left on and all others downed.
1709  */
1710 static int __bond_release_one(struct net_device *bond_dev,
1711                               struct net_device *slave_dev,
1712                               bool all)
1713 {
1714         struct bonding *bond = netdev_priv(bond_dev);
1715         struct slave *slave, *oldcurrent;
1716         struct sockaddr addr;
1717         int old_flags = bond_dev->flags;
1718         netdev_features_t old_features = bond_dev->features;
1719
1720         /* slave is not a slave or master is not master of this slave */
1721         if (!(slave_dev->flags & IFF_SLAVE) ||
1722             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1723                 pr_err("%s: Error: cannot release %s.\n",
1724                        bond_dev->name, slave_dev->name);
1725                 return -EINVAL;
1726         }
1727
1728         block_netpoll_tx();
1729         write_lock_bh(&bond->lock);
1730
1731         slave = bond_get_slave_by_dev(bond, slave_dev);
1732         if (!slave) {
1733                 /* not a slave of this bond */
1734                 pr_info("%s: %s not enslaved\n",
1735                         bond_dev->name, slave_dev->name);
1736                 write_unlock_bh(&bond->lock);
1737                 unblock_netpoll_tx();
1738                 return -EINVAL;
1739         }
1740
1741         write_unlock_bh(&bond->lock);
1742
1743         bond_upper_dev_unlink(bond_dev, slave_dev);
1744         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1745          * for this slave anymore.
1746          */
1747         netdev_rx_handler_unregister(slave_dev);
1748         write_lock_bh(&bond->lock);
1749
1750         /* Inform AD package of unbinding of slave. */
1751         if (bond->params.mode == BOND_MODE_8023AD) {
1752                 /* must be called before the slave is
1753                  * detached from the list
1754                  */
1755                 bond_3ad_unbind_slave(slave);
1756         }
1757
1758         pr_info("%s: releasing %s interface %s\n",
1759                 bond_dev->name,
1760                 bond_is_active_slave(slave) ? "active" : "backup",
1761                 slave_dev->name);
1762
1763         oldcurrent = bond->curr_active_slave;
1764
1765         bond->current_arp_slave = NULL;
1766
1767         /* release the slave from its bond */
1768         bond_detach_slave(bond, slave);
1769
1770         if (!all && !bond->params.fail_over_mac) {
1771                 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
1772                     bond_has_slaves(bond))
1773                         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",
1774                                    bond_dev->name, slave_dev->name,
1775                                    slave->perm_hwaddr,
1776                                    bond_dev->name, slave_dev->name);
1777         }
1778
1779         if (bond->primary_slave == slave)
1780                 bond->primary_slave = NULL;
1781
1782         if (oldcurrent == slave)
1783                 bond_change_active_slave(bond, NULL);
1784
1785         if (bond_is_lb(bond)) {
1786                 /* Must be called only after the slave has been
1787                  * detached from the list and the curr_active_slave
1788                  * has been cleared (if our_slave == old_current),
1789                  * but before a new active slave is selected.
1790                  */
1791                 write_unlock_bh(&bond->lock);
1792                 bond_alb_deinit_slave(bond, slave);
1793                 write_lock_bh(&bond->lock);
1794         }
1795
1796         if (all) {
1797                 rcu_assign_pointer(bond->curr_active_slave, NULL);
1798         } else if (oldcurrent == slave) {
1799                 /*
1800                  * Note that we hold RTNL over this sequence, so there
1801                  * is no concern that another slave add/remove event
1802                  * will interfere.
1803                  */
1804                 write_unlock_bh(&bond->lock);
1805                 read_lock(&bond->lock);
1806                 write_lock_bh(&bond->curr_slave_lock);
1807
1808                 bond_select_active_slave(bond);
1809
1810                 write_unlock_bh(&bond->curr_slave_lock);
1811                 read_unlock(&bond->lock);
1812                 write_lock_bh(&bond->lock);
1813         }
1814
1815         if (!bond_has_slaves(bond)) {
1816                 bond_set_carrier(bond);
1817                 eth_hw_addr_random(bond_dev);
1818
1819                 if (vlan_uses_dev(bond_dev)) {
1820                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1821                                    bond_dev->name, bond_dev->name);
1822                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1823                                    bond_dev->name);
1824                 }
1825         }
1826
1827         write_unlock_bh(&bond->lock);
1828         unblock_netpoll_tx();
1829         synchronize_rcu();
1830
1831         if (!bond_has_slaves(bond)) {
1832                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1833                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1834         }
1835
1836         bond_compute_features(bond);
1837         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1838             (old_features & NETIF_F_VLAN_CHALLENGED))
1839                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1840                         bond_dev->name, slave_dev->name, bond_dev->name);
1841
1842         /* must do this from outside any spinlocks */
1843         vlan_vids_del_by_dev(slave_dev, bond_dev);
1844
1845         /* If the mode USES_PRIMARY, then this cases was handled above by
1846          * bond_change_active_slave(..., NULL)
1847          */
1848         if (!USES_PRIMARY(bond->params.mode)) {
1849                 /* unset promiscuity level from slave
1850                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1851                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1852                  * value of that flag before that change, as that was the value
1853                  * when this slave was attached, so we cache at the start of the
1854                  * function and use it here. Same goes for ALLMULTI below
1855                  */
1856                 if (old_flags & IFF_PROMISC)
1857                         dev_set_promiscuity(slave_dev, -1);
1858
1859                 /* unset allmulti level from slave */
1860                 if (old_flags & IFF_ALLMULTI)
1861                         dev_set_allmulti(slave_dev, -1);
1862
1863                 bond_hw_addr_flush(bond_dev, slave_dev);
1864         }
1865
1866         slave_disable_netpoll(slave);
1867
1868         /* close slave before restoring its mac address */
1869         dev_close(slave_dev);
1870
1871         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1872                 /* restore original ("permanent") mac address */
1873                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1874                 addr.sa_family = slave_dev->type;
1875                 dev_set_mac_address(slave_dev, &addr);
1876         }
1877
1878         dev_set_mtu(slave_dev, slave->original_mtu);
1879
1880         slave_dev->priv_flags &= ~IFF_BONDING;
1881
1882         kfree(slave);
1883
1884         return 0;  /* deletion OK */
1885 }
1886
1887 /* A wrapper used because of ndo_del_link */
1888 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1889 {
1890         return __bond_release_one(bond_dev, slave_dev, false);
1891 }
1892
1893 /*
1894 * First release a slave and then destroy the bond if no more slaves are left.
1895 * Must be under rtnl_lock when this function is called.
1896 */
1897 static int  bond_release_and_destroy(struct net_device *bond_dev,
1898                                      struct net_device *slave_dev)
1899 {
1900         struct bonding *bond = netdev_priv(bond_dev);
1901         int ret;
1902
1903         ret = bond_release(bond_dev, slave_dev);
1904         if (ret == 0 && !bond_has_slaves(bond)) {
1905                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1906                 pr_info("%s: destroying bond %s.\n",
1907                         bond_dev->name, bond_dev->name);
1908                 unregister_netdevice(bond_dev);
1909         }
1910         return ret;
1911 }
1912
1913 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1914 {
1915         struct bonding *bond = netdev_priv(bond_dev);
1916
1917         info->bond_mode = bond->params.mode;
1918         info->miimon = bond->params.miimon;
1919
1920         read_lock(&bond->lock);
1921         info->num_slaves = bond->slave_cnt;
1922         read_unlock(&bond->lock);
1923
1924         return 0;
1925 }
1926
1927 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1928 {
1929         struct bonding *bond = netdev_priv(bond_dev);
1930         struct list_head *iter;
1931         int i = 0, res = -ENODEV;
1932         struct slave *slave;
1933
1934         read_lock(&bond->lock);
1935         bond_for_each_slave(bond, slave, iter) {
1936                 if (i++ == (int)info->slave_id) {
1937                         res = 0;
1938                         strcpy(info->slave_name, slave->dev->name);
1939                         info->link = slave->link;
1940                         info->state = bond_slave_state(slave);
1941                         info->link_failure_count = slave->link_failure_count;
1942                         break;
1943                 }
1944         }
1945         read_unlock(&bond->lock);
1946
1947         return res;
1948 }
1949
1950 /*-------------------------------- Monitoring -------------------------------*/
1951
1952
1953 static int bond_miimon_inspect(struct bonding *bond)
1954 {
1955         int link_state, commit = 0;
1956         struct list_head *iter;
1957         struct slave *slave;
1958         bool ignore_updelay;
1959
1960         ignore_updelay = !bond->curr_active_slave ? true : false;
1961
1962         bond_for_each_slave(bond, slave, iter) {
1963                 slave->new_link = BOND_LINK_NOCHANGE;
1964
1965                 link_state = bond_check_dev_link(bond, slave->dev, 0);
1966
1967                 switch (slave->link) {
1968                 case BOND_LINK_UP:
1969                         if (link_state)
1970                                 continue;
1971
1972                         slave->link = BOND_LINK_FAIL;
1973                         slave->delay = bond->params.downdelay;
1974                         if (slave->delay) {
1975                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
1976                                         bond->dev->name,
1977                                         (bond->params.mode ==
1978                                          BOND_MODE_ACTIVEBACKUP) ?
1979                                         (bond_is_active_slave(slave) ?
1980                                          "active " : "backup ") : "",
1981                                         slave->dev->name,
1982                                         bond->params.downdelay * bond->params.miimon);
1983                         }
1984                         /*FALLTHRU*/
1985                 case BOND_LINK_FAIL:
1986                         if (link_state) {
1987                                 /*
1988                                  * recovered before downdelay expired
1989                                  */
1990                                 slave->link = BOND_LINK_UP;
1991                                 slave->jiffies = jiffies;
1992                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
1993                                         bond->dev->name,
1994                                         (bond->params.downdelay - slave->delay) *
1995                                         bond->params.miimon,
1996                                         slave->dev->name);
1997                                 continue;
1998                         }
1999
2000                         if (slave->delay <= 0) {
2001                                 slave->new_link = BOND_LINK_DOWN;
2002                                 commit++;
2003                                 continue;
2004                         }
2005
2006                         slave->delay--;
2007                         break;
2008
2009                 case BOND_LINK_DOWN:
2010                         if (!link_state)
2011                                 continue;
2012
2013                         slave->link = BOND_LINK_BACK;
2014                         slave->delay = bond->params.updelay;
2015
2016                         if (slave->delay) {
2017                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2018                                         bond->dev->name, slave->dev->name,
2019                                         ignore_updelay ? 0 :
2020                                         bond->params.updelay *
2021                                         bond->params.miimon);
2022                         }
2023                         /*FALLTHRU*/
2024                 case BOND_LINK_BACK:
2025                         if (!link_state) {
2026                                 slave->link = BOND_LINK_DOWN;
2027                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2028                                         bond->dev->name,
2029                                         (bond->params.updelay - slave->delay) *
2030                                         bond->params.miimon,
2031                                         slave->dev->name);
2032
2033                                 continue;
2034                         }
2035
2036                         if (ignore_updelay)
2037                                 slave->delay = 0;
2038
2039                         if (slave->delay <= 0) {
2040                                 slave->new_link = BOND_LINK_UP;
2041                                 commit++;
2042                                 ignore_updelay = false;
2043                                 continue;
2044                         }
2045
2046                         slave->delay--;
2047                         break;
2048                 }
2049         }
2050
2051         return commit;
2052 }
2053
2054 static void bond_miimon_commit(struct bonding *bond)
2055 {
2056         struct list_head *iter;
2057         struct slave *slave;
2058
2059         bond_for_each_slave(bond, slave, iter) {
2060                 switch (slave->new_link) {
2061                 case BOND_LINK_NOCHANGE:
2062                         continue;
2063
2064                 case BOND_LINK_UP:
2065                         slave->link = BOND_LINK_UP;
2066                         slave->jiffies = jiffies;
2067
2068                         if (bond->params.mode == BOND_MODE_8023AD) {
2069                                 /* prevent it from being the active one */
2070                                 bond_set_backup_slave(slave);
2071                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2072                                 /* make it immediately active */
2073                                 bond_set_active_slave(slave);
2074                         } else if (slave != bond->primary_slave) {
2075                                 /* prevent it from being the active one */
2076                                 bond_set_backup_slave(slave);
2077                         }
2078
2079                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2080                                 bond->dev->name, slave->dev->name,
2081                                 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2082                                 slave->duplex ? "full" : "half");
2083
2084                         /* notify ad that the link status has changed */
2085                         if (bond->params.mode == BOND_MODE_8023AD)
2086                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2087
2088                         if (bond_is_lb(bond))
2089                                 bond_alb_handle_link_change(bond, slave,
2090                                                             BOND_LINK_UP);
2091
2092                         if (!bond->curr_active_slave ||
2093                             (slave == bond->primary_slave))
2094                                 goto do_failover;
2095
2096                         continue;
2097
2098                 case BOND_LINK_DOWN:
2099                         if (slave->link_failure_count < UINT_MAX)
2100                                 slave->link_failure_count++;
2101
2102                         slave->link = BOND_LINK_DOWN;
2103
2104                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2105                             bond->params.mode == BOND_MODE_8023AD)
2106                                 bond_set_slave_inactive_flags(slave);
2107
2108                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2109                                 bond->dev->name, slave->dev->name);
2110
2111                         if (bond->params.mode == BOND_MODE_8023AD)
2112                                 bond_3ad_handle_link_change(slave,
2113                                                             BOND_LINK_DOWN);
2114
2115                         if (bond_is_lb(bond))
2116                                 bond_alb_handle_link_change(bond, slave,
2117                                                             BOND_LINK_DOWN);
2118
2119                         if (slave == bond->curr_active_slave)
2120                                 goto do_failover;
2121
2122                         continue;
2123
2124                 default:
2125                         pr_err("%s: invalid new link %d on slave %s\n",
2126                                bond->dev->name, slave->new_link,
2127                                slave->dev->name);
2128                         slave->new_link = BOND_LINK_NOCHANGE;
2129
2130                         continue;
2131                 }
2132
2133 do_failover:
2134                 ASSERT_RTNL();
2135                 block_netpoll_tx();
2136                 write_lock_bh(&bond->curr_slave_lock);
2137                 bond_select_active_slave(bond);
2138                 write_unlock_bh(&bond->curr_slave_lock);
2139                 unblock_netpoll_tx();
2140         }
2141
2142         bond_set_carrier(bond);
2143 }
2144
2145 /*
2146  * bond_mii_monitor
2147  *
2148  * Really a wrapper that splits the mii monitor into two phases: an
2149  * inspection, then (if inspection indicates something needs to be done)
2150  * an acquisition of appropriate locks followed by a commit phase to
2151  * implement whatever link state changes are indicated.
2152  */
2153 void bond_mii_monitor(struct work_struct *work)
2154 {
2155         struct bonding *bond = container_of(work, struct bonding,
2156                                             mii_work.work);
2157         bool should_notify_peers = false;
2158         unsigned long delay;
2159
2160         read_lock(&bond->lock);
2161
2162         delay = msecs_to_jiffies(bond->params.miimon);
2163
2164         if (!bond_has_slaves(bond))
2165                 goto re_arm;
2166
2167         should_notify_peers = bond_should_notify_peers(bond);
2168
2169         if (bond_miimon_inspect(bond)) {
2170                 read_unlock(&bond->lock);
2171
2172                 /* Race avoidance with bond_close cancel of workqueue */
2173                 if (!rtnl_trylock()) {
2174                         read_lock(&bond->lock);
2175                         delay = 1;
2176                         should_notify_peers = false;
2177                         goto re_arm;
2178                 }
2179
2180                 read_lock(&bond->lock);
2181
2182                 bond_miimon_commit(bond);
2183
2184                 read_unlock(&bond->lock);
2185                 rtnl_unlock();  /* might sleep, hold no other locks */
2186                 read_lock(&bond->lock);
2187         }
2188
2189 re_arm:
2190         if (bond->params.miimon)
2191                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2192
2193         read_unlock(&bond->lock);
2194
2195         if (should_notify_peers) {
2196                 if (!rtnl_trylock())
2197                         return;
2198                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2199                 rtnl_unlock();
2200         }
2201 }
2202
2203 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2204 {
2205         struct net_device *upper;
2206         struct list_head *iter;
2207         bool ret = false;
2208
2209         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2210                 return true;
2211
2212         rcu_read_lock();
2213         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2214                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2215                         ret = true;
2216                         break;
2217                 }
2218         }
2219         rcu_read_unlock();
2220
2221         return ret;
2222 }
2223
2224 /*
2225  * We go to the (large) trouble of VLAN tagging ARP frames because
2226  * switches in VLAN mode (especially if ports are configured as
2227  * "native" to a VLAN) might not pass non-tagged frames.
2228  */
2229 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2230 {
2231         struct sk_buff *skb;
2232
2233         pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op,
2234                  slave_dev->name, &dest_ip, &src_ip, vlan_id);
2235
2236         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2237                          NULL, slave_dev->dev_addr, NULL);
2238
2239         if (!skb) {
2240                 pr_err("ARP packet allocation failed\n");
2241                 return;
2242         }
2243         if (vlan_id) {
2244                 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2245                 if (!skb) {
2246                         pr_err("failed to insert VLAN tag\n");
2247                         return;
2248                 }
2249         }
2250         arp_xmit(skb);
2251 }
2252
2253
2254 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2255 {
2256         struct net_device *upper, *vlan_upper;
2257         struct list_head *iter, *vlan_iter;
2258         struct rtable *rt;
2259         __be32 *targets = bond->params.arp_targets, addr;
2260         int i, vlan_id;
2261
2262         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2263                 pr_debug("basa: target %pI4\n", &targets[i]);
2264
2265                 /* Find out through which dev should the packet go */
2266                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2267                                      RTO_ONLINK, 0);
2268                 if (IS_ERR(rt)) {
2269                         pr_debug("%s: no route to arp_ip_target %pI4\n",
2270                                  bond->dev->name, &targets[i]);
2271                         continue;
2272                 }
2273
2274                 vlan_id = 0;
2275
2276                 /* bond device itself */
2277                 if (rt->dst.dev == bond->dev)
2278                         goto found;
2279
2280                 rcu_read_lock();
2281                 /* first we search only for vlan devices. for every vlan
2282                  * found we verify its upper dev list, searching for the
2283                  * rt->dst.dev. If found we save the tag of the vlan and
2284                  * proceed to send the packet.
2285                  *
2286                  * TODO: QinQ?
2287                  */
2288                 netdev_for_each_all_upper_dev_rcu(bond->dev, vlan_upper,
2289                                                   vlan_iter) {
2290                         if (!is_vlan_dev(vlan_upper))
2291                                 continue;
2292                         netdev_for_each_all_upper_dev_rcu(vlan_upper, upper,
2293                                                           iter) {
2294                                 if (upper == rt->dst.dev) {
2295                                         vlan_id = vlan_dev_vlan_id(vlan_upper);
2296                                         rcu_read_unlock();
2297                                         goto found;
2298                                 }
2299                         }
2300                 }
2301
2302                 /* if the device we're looking for is not on top of any of
2303                  * our upper vlans, then just search for any dev that
2304                  * matches, and in case it's a vlan - save the id
2305                  */
2306                 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2307                         if (upper == rt->dst.dev) {
2308                                 /* if it's a vlan - get its VID */
2309                                 if (is_vlan_dev(upper))
2310                                         vlan_id = vlan_dev_vlan_id(upper);
2311
2312                                 rcu_read_unlock();
2313                                 goto found;
2314                         }
2315                 }
2316                 rcu_read_unlock();
2317
2318                 /* Not our device - skip */
2319                 pr_debug("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2320                          bond->dev->name, &targets[i],
2321                          rt->dst.dev ? rt->dst.dev->name : "NULL");
2322
2323                 ip_rt_put(rt);
2324                 continue;
2325
2326 found:
2327                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2328                 ip_rt_put(rt);
2329                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2330                               addr, vlan_id);
2331         }
2332 }
2333
2334 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2335 {
2336         int i;
2337
2338         if (!sip || !bond_has_this_ip(bond, tip)) {
2339                 pr_debug("bva: sip %pI4 tip %pI4 not found\n", &sip, &tip);
2340                 return;
2341         }
2342
2343         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2344         if (i == -1) {
2345                 pr_debug("bva: sip %pI4 not found in targets\n", &sip);
2346                 return;
2347         }
2348         slave->last_arp_rx = jiffies;
2349         slave->target_last_arp_rx[i] = jiffies;
2350 }
2351
2352 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2353                  struct slave *slave)
2354 {
2355         struct arphdr *arp = (struct arphdr *)skb->data;
2356         unsigned char *arp_ptr;
2357         __be32 sip, tip;
2358         int alen;
2359
2360         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2361                 return RX_HANDLER_ANOTHER;
2362
2363         read_lock(&bond->lock);
2364
2365         if (!slave_do_arp_validate(bond, slave))
2366                 goto out_unlock;
2367
2368         alen = arp_hdr_len(bond->dev);
2369
2370         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2371                  bond->dev->name, skb->dev->name);
2372
2373         if (alen > skb_headlen(skb)) {
2374                 arp = kmalloc(alen, GFP_ATOMIC);
2375                 if (!arp)
2376                         goto out_unlock;
2377                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2378                         goto out_unlock;
2379         }
2380
2381         if (arp->ar_hln != bond->dev->addr_len ||
2382             skb->pkt_type == PACKET_OTHERHOST ||
2383             skb->pkt_type == PACKET_LOOPBACK ||
2384             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2385             arp->ar_pro != htons(ETH_P_IP) ||
2386             arp->ar_pln != 4)
2387                 goto out_unlock;
2388
2389         arp_ptr = (unsigned char *)(arp + 1);
2390         arp_ptr += bond->dev->addr_len;
2391         memcpy(&sip, arp_ptr, 4);
2392         arp_ptr += 4 + bond->dev->addr_len;
2393         memcpy(&tip, arp_ptr, 4);
2394
2395         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2396                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2397                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2398                  &sip, &tip);
2399
2400         /*
2401          * Backup slaves won't see the ARP reply, but do come through
2402          * here for each ARP probe (so we swap the sip/tip to validate
2403          * the probe).  In a "redundant switch, common router" type of
2404          * configuration, the ARP probe will (hopefully) travel from
2405          * the active, through one switch, the router, then the other
2406          * switch before reaching the backup.
2407          *
2408          * We 'trust' the arp requests if there is an active slave and
2409          * it received valid arp reply(s) after it became active. This
2410          * is done to avoid endless looping when we can't reach the
2411          * arp_ip_target and fool ourselves with our own arp requests.
2412          */
2413         if (bond_is_active_slave(slave))
2414                 bond_validate_arp(bond, slave, sip, tip);
2415         else if (bond->curr_active_slave &&
2416                  time_after(slave_last_rx(bond, bond->curr_active_slave),
2417                             bond->curr_active_slave->jiffies))
2418                 bond_validate_arp(bond, slave, tip, sip);
2419
2420 out_unlock:
2421         read_unlock(&bond->lock);
2422         if (arp != (struct arphdr *)skb->data)
2423                 kfree(arp);
2424         return RX_HANDLER_ANOTHER;
2425 }
2426
2427 /* function to verify if we're in the arp_interval timeslice, returns true if
2428  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2429  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2430  */
2431 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2432                                   int mod)
2433 {
2434         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2435
2436         return time_in_range(jiffies,
2437                              last_act - delta_in_ticks,
2438                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2439 }
2440
2441 /*
2442  * this function is called regularly to monitor each slave's link
2443  * ensuring that traffic is being sent and received when arp monitoring
2444  * is used in load-balancing mode. if the adapter has been dormant, then an
2445  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2446  * arp monitoring in active backup mode.
2447  */
2448 void bond_loadbalance_arp_mon(struct work_struct *work)
2449 {
2450         struct bonding *bond = container_of(work, struct bonding,
2451                                             arp_work.work);
2452         struct slave *slave, *oldcurrent;
2453         struct list_head *iter;
2454         int do_failover = 0;
2455
2456         read_lock(&bond->lock);
2457
2458         if (!bond_has_slaves(bond))
2459                 goto re_arm;
2460
2461         oldcurrent = bond->curr_active_slave;
2462         /* see if any of the previous devices are up now (i.e. they have
2463          * xmt and rcv traffic). the curr_active_slave does not come into
2464          * the picture unless it is null. also, slave->jiffies is not needed
2465          * here because we send an arp on each slave and give a slave as
2466          * long as it needs to get the tx/rx within the delta.
2467          * TODO: what about up/down delay in arp mode? it wasn't here before
2468          *       so it can wait
2469          */
2470         bond_for_each_slave(bond, slave, iter) {
2471                 unsigned long trans_start = dev_trans_start(slave->dev);
2472
2473                 if (slave->link != BOND_LINK_UP) {
2474                         if (bond_time_in_interval(bond, trans_start, 1) &&
2475                             bond_time_in_interval(bond, slave->dev->last_rx, 1)) {
2476
2477                                 slave->link  = BOND_LINK_UP;
2478                                 bond_set_active_slave(slave);
2479
2480                                 /* primary_slave has no meaning in round-robin
2481                                  * mode. the window of a slave being up and
2482                                  * curr_active_slave being null after enslaving
2483                                  * is closed.
2484                                  */
2485                                 if (!oldcurrent) {
2486                                         pr_info("%s: link status definitely up for interface %s, ",
2487                                                 bond->dev->name,
2488                                                 slave->dev->name);
2489                                         do_failover = 1;
2490                                 } else {
2491                                         pr_info("%s: interface %s is now up\n",
2492                                                 bond->dev->name,
2493                                                 slave->dev->name);
2494                                 }
2495                         }
2496                 } else {
2497                         /* slave->link == BOND_LINK_UP */
2498
2499                         /* not all switches will respond to an arp request
2500                          * when the source ip is 0, so don't take the link down
2501                          * if we don't know our ip yet
2502                          */
2503                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2504                             !bond_time_in_interval(bond, slave->dev->last_rx, 2)) {
2505
2506                                 slave->link  = BOND_LINK_DOWN;
2507                                 bond_set_backup_slave(slave);
2508
2509                                 if (slave->link_failure_count < UINT_MAX)
2510                                         slave->link_failure_count++;
2511
2512                                 pr_info("%s: interface %s is now down.\n",
2513                                         bond->dev->name,
2514                                         slave->dev->name);
2515
2516                                 if (slave == oldcurrent)
2517                                         do_failover = 1;
2518                         }
2519                 }
2520
2521                 /* note: if switch is in round-robin mode, all links
2522                  * must tx arp to ensure all links rx an arp - otherwise
2523                  * links may oscillate or not come up at all; if switch is
2524                  * in something like xor mode, there is nothing we can
2525                  * do - all replies will be rx'ed on same link causing slaves
2526                  * to be unstable during low/no traffic periods
2527                  */
2528                 if (IS_UP(slave->dev))
2529                         bond_arp_send_all(bond, slave);
2530         }
2531
2532         if (do_failover) {
2533                 block_netpoll_tx();
2534                 write_lock_bh(&bond->curr_slave_lock);
2535
2536                 bond_select_active_slave(bond);
2537
2538                 write_unlock_bh(&bond->curr_slave_lock);
2539                 unblock_netpoll_tx();
2540         }
2541
2542 re_arm:
2543         if (bond->params.arp_interval)
2544                 queue_delayed_work(bond->wq, &bond->arp_work,
2545                                    msecs_to_jiffies(bond->params.arp_interval));
2546
2547         read_unlock(&bond->lock);
2548 }
2549
2550 /*
2551  * Called to inspect slaves for active-backup mode ARP monitor link state
2552  * changes.  Sets new_link in slaves to specify what action should take
2553  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2554  * to link states must be committed.
2555  *
2556  * Called with bond->lock held for read.
2557  */
2558 static int bond_ab_arp_inspect(struct bonding *bond)
2559 {
2560         unsigned long trans_start, last_rx;
2561         struct list_head *iter;
2562         struct slave *slave;
2563         int commit = 0;
2564
2565         bond_for_each_slave(bond, slave, iter) {
2566                 slave->new_link = BOND_LINK_NOCHANGE;
2567                 last_rx = slave_last_rx(bond, slave);
2568
2569                 if (slave->link != BOND_LINK_UP) {
2570                         if (bond_time_in_interval(bond, last_rx, 1)) {
2571                                 slave->new_link = BOND_LINK_UP;
2572                                 commit++;
2573                         }
2574                         continue;
2575                 }
2576
2577                 /*
2578                  * Give slaves 2*delta after being enslaved or made
2579                  * active.  This avoids bouncing, as the last receive
2580                  * times need a full ARP monitor cycle to be updated.
2581                  */
2582                 if (bond_time_in_interval(bond, slave->jiffies, 2))
2583                         continue;
2584
2585                 /*
2586                  * Backup slave is down if:
2587                  * - No current_arp_slave AND
2588                  * - more than 3*delta since last receive AND
2589                  * - the bond has an IP address
2590                  *
2591                  * Note: a non-null current_arp_slave indicates
2592                  * the curr_active_slave went down and we are
2593                  * searching for a new one; under this condition
2594                  * we only take the curr_active_slave down - this
2595                  * gives each slave a chance to tx/rx traffic
2596                  * before being taken out
2597                  */
2598                 if (!bond_is_active_slave(slave) &&
2599                     !bond->current_arp_slave &&
2600                     !bond_time_in_interval(bond, last_rx, 3)) {
2601                         slave->new_link = BOND_LINK_DOWN;
2602                         commit++;
2603                 }
2604
2605                 /*
2606                  * Active slave is down if:
2607                  * - more than 2*delta since transmitting OR
2608                  * - (more than 2*delta since receive AND
2609                  *    the bond has an IP address)
2610                  */
2611                 trans_start = dev_trans_start(slave->dev);
2612                 if (bond_is_active_slave(slave) &&
2613                     (!bond_time_in_interval(bond, trans_start, 2) ||
2614                      !bond_time_in_interval(bond, last_rx, 2))) {
2615                         slave->new_link = BOND_LINK_DOWN;
2616                         commit++;
2617                 }
2618         }
2619
2620         return commit;
2621 }
2622
2623 /*
2624  * Called to commit link state changes noted by inspection step of
2625  * active-backup mode ARP monitor.
2626  *
2627  * Called with RTNL and bond->lock for read.
2628  */
2629 static void bond_ab_arp_commit(struct bonding *bond)
2630 {
2631         unsigned long trans_start;
2632         struct list_head *iter;
2633         struct slave *slave;
2634
2635         bond_for_each_slave(bond, slave, iter) {
2636                 switch (slave->new_link) {
2637                 case BOND_LINK_NOCHANGE:
2638                         continue;
2639
2640                 case BOND_LINK_UP:
2641                         trans_start = dev_trans_start(slave->dev);
2642                         if (bond->curr_active_slave != slave ||
2643                             (!bond->curr_active_slave &&
2644                              bond_time_in_interval(bond, trans_start, 1))) {
2645                                 slave->link = BOND_LINK_UP;
2646                                 if (bond->current_arp_slave) {
2647                                         bond_set_slave_inactive_flags(
2648                                                 bond->current_arp_slave);
2649                                         bond->current_arp_slave = NULL;
2650                                 }
2651
2652                                 pr_info("%s: link status definitely up for interface %s.\n",
2653                                         bond->dev->name, slave->dev->name);
2654
2655                                 if (!bond->curr_active_slave ||
2656                                     (slave == bond->primary_slave))
2657                                         goto do_failover;
2658
2659                         }
2660
2661                         continue;
2662
2663                 case BOND_LINK_DOWN:
2664                         if (slave->link_failure_count < UINT_MAX)
2665                                 slave->link_failure_count++;
2666
2667                         slave->link = BOND_LINK_DOWN;
2668                         bond_set_slave_inactive_flags(slave);
2669
2670                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2671                                 bond->dev->name, slave->dev->name);
2672
2673                         if (slave == bond->curr_active_slave) {
2674                                 bond->current_arp_slave = NULL;
2675                                 goto do_failover;
2676                         }
2677
2678                         continue;
2679
2680                 default:
2681                         pr_err("%s: impossible: new_link %d on slave %s\n",
2682                                bond->dev->name, slave->new_link,
2683                                slave->dev->name);
2684                         continue;
2685                 }
2686
2687 do_failover:
2688                 ASSERT_RTNL();
2689                 block_netpoll_tx();
2690                 write_lock_bh(&bond->curr_slave_lock);
2691                 bond_select_active_slave(bond);
2692                 write_unlock_bh(&bond->curr_slave_lock);
2693                 unblock_netpoll_tx();
2694         }
2695
2696         bond_set_carrier(bond);
2697 }
2698
2699 /*
2700  * Send ARP probes for active-backup mode ARP monitor.
2701  *
2702  * Called with bond->lock held for read.
2703  */
2704 static void bond_ab_arp_probe(struct bonding *bond)
2705 {
2706         struct slave *slave, *before = NULL, *new_slave = NULL;
2707         struct list_head *iter;
2708         bool found = false;
2709
2710         read_lock(&bond->curr_slave_lock);
2711
2712         if (bond->current_arp_slave && bond->curr_active_slave)
2713                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
2714                         bond->current_arp_slave->dev->name,
2715                         bond->curr_active_slave->dev->name);
2716
2717         if (bond->curr_active_slave) {
2718                 bond_arp_send_all(bond, bond->curr_active_slave);
2719                 read_unlock(&bond->curr_slave_lock);
2720                 return;
2721         }
2722
2723         read_unlock(&bond->curr_slave_lock);
2724
2725         /* if we don't have a curr_active_slave, search for the next available
2726          * backup slave from the current_arp_slave and make it the candidate
2727          * for becoming the curr_active_slave
2728          */
2729
2730         if (!bond->current_arp_slave) {
2731                 bond->current_arp_slave = bond_first_slave(bond);
2732                 if (!bond->current_arp_slave)
2733                         return;
2734         }
2735
2736         bond_set_slave_inactive_flags(bond->current_arp_slave);
2737
2738         bond_for_each_slave(bond, slave, iter) {
2739                 if (!found && !before && IS_UP(slave->dev))
2740                         before = slave;
2741
2742                 if (found && !new_slave && IS_UP(slave->dev))
2743                         new_slave = slave;
2744                 /* if the link state is up at this point, we
2745                  * mark it down - this can happen if we have
2746                  * simultaneous link failures and
2747                  * reselect_active_interface doesn't make this
2748                  * one the current slave so it is still marked
2749                  * up when it is actually down
2750                  */
2751                 if (!IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
2752                         slave->link = BOND_LINK_DOWN;
2753                         if (slave->link_failure_count < UINT_MAX)
2754                                 slave->link_failure_count++;
2755
2756                         bond_set_slave_inactive_flags(slave);
2757
2758                         pr_info("%s: backup interface %s is now down.\n",
2759                                 bond->dev->name, slave->dev->name);
2760                 }
2761                 if (slave == bond->current_arp_slave)
2762                         found = true;
2763         }
2764
2765         if (!new_slave && before)
2766                 new_slave = before;
2767
2768         if (!new_slave)
2769                 return;
2770
2771         new_slave->link = BOND_LINK_BACK;
2772         bond_set_slave_active_flags(new_slave);
2773         bond_arp_send_all(bond, new_slave);
2774         new_slave->jiffies = jiffies;
2775         bond->current_arp_slave = new_slave;
2776
2777 }
2778
2779 void bond_activebackup_arp_mon(struct work_struct *work)
2780 {
2781         struct bonding *bond = container_of(work, struct bonding,
2782                                             arp_work.work);
2783         bool should_notify_peers = false;
2784         int delta_in_ticks;
2785
2786         read_lock(&bond->lock);
2787
2788         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2789
2790         if (!bond_has_slaves(bond))
2791                 goto re_arm;
2792
2793         should_notify_peers = bond_should_notify_peers(bond);
2794
2795         if (bond_ab_arp_inspect(bond)) {
2796                 read_unlock(&bond->lock);
2797
2798                 /* Race avoidance with bond_close flush of workqueue */
2799                 if (!rtnl_trylock()) {
2800                         read_lock(&bond->lock);
2801                         delta_in_ticks = 1;
2802                         should_notify_peers = false;
2803                         goto re_arm;
2804                 }
2805
2806                 read_lock(&bond->lock);
2807
2808                 bond_ab_arp_commit(bond);
2809
2810                 read_unlock(&bond->lock);
2811                 rtnl_unlock();
2812                 read_lock(&bond->lock);
2813         }
2814
2815         bond_ab_arp_probe(bond);
2816
2817 re_arm:
2818         if (bond->params.arp_interval)
2819                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2820
2821         read_unlock(&bond->lock);
2822
2823         if (should_notify_peers) {
2824                 if (!rtnl_trylock())
2825                         return;
2826                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2827                 rtnl_unlock();
2828         }
2829 }
2830
2831 /*-------------------------- netdev event handling --------------------------*/
2832
2833 /*
2834  * Change device name
2835  */
2836 static int bond_event_changename(struct bonding *bond)
2837 {
2838         bond_remove_proc_entry(bond);
2839         bond_create_proc_entry(bond);
2840
2841         bond_debug_reregister(bond);
2842
2843         return NOTIFY_DONE;
2844 }
2845
2846 static int bond_master_netdev_event(unsigned long event,
2847                                     struct net_device *bond_dev)
2848 {
2849         struct bonding *event_bond = netdev_priv(bond_dev);
2850
2851         switch (event) {
2852         case NETDEV_CHANGENAME:
2853                 return bond_event_changename(event_bond);
2854         case NETDEV_UNREGISTER:
2855                 bond_remove_proc_entry(event_bond);
2856                 break;
2857         case NETDEV_REGISTER:
2858                 bond_create_proc_entry(event_bond);
2859                 break;
2860         case NETDEV_NOTIFY_PEERS:
2861                 if (event_bond->send_peer_notif)
2862                         event_bond->send_peer_notif--;
2863                 break;
2864         default:
2865                 break;
2866         }
2867
2868         return NOTIFY_DONE;
2869 }
2870
2871 static int bond_slave_netdev_event(unsigned long event,
2872                                    struct net_device *slave_dev)
2873 {
2874         struct slave *slave = bond_slave_get_rtnl(slave_dev);
2875         struct bonding *bond;
2876         struct net_device *bond_dev;
2877         u32 old_speed;
2878         u8 old_duplex;
2879
2880         /* A netdev event can be generated while enslaving a device
2881          * before netdev_rx_handler_register is called in which case
2882          * slave will be NULL
2883          */
2884         if (!slave)
2885                 return NOTIFY_DONE;
2886         bond_dev = slave->bond->dev;
2887         bond = slave->bond;
2888
2889         switch (event) {
2890         case NETDEV_UNREGISTER:
2891                 if (bond_dev->type != ARPHRD_ETHER)
2892                         bond_release_and_destroy(bond_dev, slave_dev);
2893                 else
2894                         bond_release(bond_dev, slave_dev);
2895                 break;
2896         case NETDEV_UP:
2897         case NETDEV_CHANGE:
2898                 old_speed = slave->speed;
2899                 old_duplex = slave->duplex;
2900
2901                 bond_update_speed_duplex(slave);
2902
2903                 if (bond->params.mode == BOND_MODE_8023AD) {
2904                         if (old_speed != slave->speed)
2905                                 bond_3ad_adapter_speed_changed(slave);
2906                         if (old_duplex != slave->duplex)
2907                                 bond_3ad_adapter_duplex_changed(slave);
2908                 }
2909                 break;
2910         case NETDEV_DOWN:
2911                 /*
2912                  * ... Or is it this?
2913                  */
2914                 break;
2915         case NETDEV_CHANGEMTU:
2916                 /*
2917                  * TODO: Should slaves be allowed to
2918                  * independently alter their MTU?  For
2919                  * an active-backup bond, slaves need
2920                  * not be the same type of device, so
2921                  * MTUs may vary.  For other modes,
2922                  * slaves arguably should have the
2923                  * same MTUs. To do this, we'd need to
2924                  * take over the slave's change_mtu
2925                  * function for the duration of their
2926                  * servitude.
2927                  */
2928                 break;
2929         case NETDEV_CHANGENAME:
2930                 /*
2931                  * TODO: handle changing the primary's name
2932                  */
2933                 break;
2934         case NETDEV_FEAT_CHANGE:
2935                 bond_compute_features(bond);
2936                 break;
2937         case NETDEV_RESEND_IGMP:
2938                 /* Propagate to master device */
2939                 call_netdevice_notifiers(event, slave->bond->dev);
2940                 break;
2941         default:
2942                 break;
2943         }
2944
2945         return NOTIFY_DONE;
2946 }
2947
2948 /*
2949  * bond_netdev_event: handle netdev notifier chain events.
2950  *
2951  * This function receives events for the netdev chain.  The caller (an
2952  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
2953  * locks for us to safely manipulate the slave devices (RTNL lock,
2954  * dev_probe_lock).
2955  */
2956 static int bond_netdev_event(struct notifier_block *this,
2957                              unsigned long event, void *ptr)
2958 {
2959         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2960
2961         pr_debug("event_dev: %s, event: %lx\n",
2962                  event_dev ? event_dev->name : "None",
2963                  event);
2964
2965         if (!(event_dev->priv_flags & IFF_BONDING))
2966                 return NOTIFY_DONE;
2967
2968         if (event_dev->flags & IFF_MASTER) {
2969                 pr_debug("IFF_MASTER\n");
2970                 return bond_master_netdev_event(event, event_dev);
2971         }
2972
2973         if (event_dev->flags & IFF_SLAVE) {
2974                 pr_debug("IFF_SLAVE\n");
2975                 return bond_slave_netdev_event(event, event_dev);
2976         }
2977
2978         return NOTIFY_DONE;
2979 }
2980
2981 static struct notifier_block bond_netdev_notifier = {
2982         .notifier_call = bond_netdev_event,
2983 };
2984
2985 /*---------------------------- Hashing Policies -----------------------------*/
2986
2987 /* L2 hash helper */
2988 static inline u32 bond_eth_hash(struct sk_buff *skb)
2989 {
2990         struct ethhdr *data = (struct ethhdr *)skb->data;
2991
2992         if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
2993                 return data->h_dest[5] ^ data->h_source[5];
2994
2995         return 0;
2996 }
2997
2998 /* Extract the appropriate headers based on bond's xmit policy */
2999 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3000                               struct flow_keys *fk)
3001 {
3002         const struct ipv6hdr *iph6;
3003         const struct iphdr *iph;
3004         int noff, proto = -1;
3005
3006         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3007                 return skb_flow_dissect(skb, fk);
3008
3009         fk->ports = 0;
3010         noff = skb_network_offset(skb);
3011         if (skb->protocol == htons(ETH_P_IP)) {
3012                 if (!pskb_may_pull(skb, noff + sizeof(*iph)))
3013                         return false;
3014                 iph = ip_hdr(skb);
3015                 fk->src = iph->saddr;
3016                 fk->dst = iph->daddr;
3017                 noff += iph->ihl << 2;
3018                 if (!ip_is_fragment(iph))
3019                         proto = iph->protocol;
3020         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3021                 if (!pskb_may_pull(skb, noff + sizeof(*iph6)))
3022                         return false;
3023                 iph6 = ipv6_hdr(skb);
3024                 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
3025                 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
3026                 noff += sizeof(*iph6);
3027                 proto = iph6->nexthdr;
3028         } else {
3029                 return false;
3030         }
3031         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3032                 fk->ports = skb_flow_get_ports(skb, noff, proto);
3033
3034         return true;
3035 }
3036
3037 /**
3038  * bond_xmit_hash - generate a hash value based on the xmit policy
3039  * @bond: bonding device
3040  * @skb: buffer to use for headers
3041  * @count: modulo value
3042  *
3043  * This function will extract the necessary headers from the skb buffer and use
3044  * them to generate a hash based on the xmit_policy set in the bonding device
3045  * which will be reduced modulo count before returning.
3046  */
3047 int bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, int count)
3048 {
3049         struct flow_keys flow;
3050         u32 hash;
3051
3052         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3053             !bond_flow_dissect(bond, skb, &flow))
3054                 return bond_eth_hash(skb) % count;
3055
3056         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3057             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3058                 hash = bond_eth_hash(skb);
3059         else
3060                 hash = (__force u32)flow.ports;
3061         hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
3062         hash ^= (hash >> 16);
3063         hash ^= (hash >> 8);
3064
3065         return hash % count;
3066 }
3067
3068 /*-------------------------- Device entry points ----------------------------*/
3069
3070 static void bond_work_init_all(struct bonding *bond)
3071 {
3072         INIT_DELAYED_WORK(&bond->mcast_work,
3073                           bond_resend_igmp_join_requests_delayed);
3074         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3075         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3076         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3077                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3078         else
3079                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3080         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3081 }
3082
3083 static void bond_work_cancel_all(struct bonding *bond)
3084 {
3085         cancel_delayed_work_sync(&bond->mii_work);
3086         cancel_delayed_work_sync(&bond->arp_work);
3087         cancel_delayed_work_sync(&bond->alb_work);
3088         cancel_delayed_work_sync(&bond->ad_work);
3089         cancel_delayed_work_sync(&bond->mcast_work);
3090 }
3091
3092 static int bond_open(struct net_device *bond_dev)
3093 {
3094         struct bonding *bond = netdev_priv(bond_dev);
3095         struct list_head *iter;
3096         struct slave *slave;
3097
3098         /* reset slave->backup and slave->inactive */
3099         read_lock(&bond->lock);
3100         if (bond_has_slaves(bond)) {
3101                 read_lock(&bond->curr_slave_lock);
3102                 bond_for_each_slave(bond, slave, iter) {
3103                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3104                                 && (slave != bond->curr_active_slave)) {
3105                                 bond_set_slave_inactive_flags(slave);
3106                         } else {
3107                                 bond_set_slave_active_flags(slave);
3108                         }
3109                 }
3110                 read_unlock(&bond->curr_slave_lock);
3111         }
3112         read_unlock(&bond->lock);
3113
3114         bond_work_init_all(bond);
3115
3116         if (bond_is_lb(bond)) {
3117                 /* bond_alb_initialize must be called before the timer
3118                  * is started.
3119                  */
3120                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3121                         return -ENOMEM;
3122                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3123         }
3124
3125         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3126                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3127
3128         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3129                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3130                 if (bond->params.arp_validate)
3131                         bond->recv_probe = bond_arp_rcv;
3132         }
3133
3134         if (bond->params.mode == BOND_MODE_8023AD) {
3135                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3136                 /* register to receive LACPDUs */
3137                 bond->recv_probe = bond_3ad_lacpdu_recv;
3138                 bond_3ad_initiate_agg_selection(bond, 1);
3139         }
3140
3141         return 0;
3142 }
3143
3144 static int bond_close(struct net_device *bond_dev)
3145 {
3146         struct bonding *bond = netdev_priv(bond_dev);
3147
3148         bond_work_cancel_all(bond);
3149         bond->send_peer_notif = 0;
3150         if (bond_is_lb(bond))
3151                 bond_alb_deinitialize(bond);
3152         bond->recv_probe = NULL;
3153
3154         return 0;
3155 }
3156
3157 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3158                                                 struct rtnl_link_stats64 *stats)
3159 {
3160         struct bonding *bond = netdev_priv(bond_dev);
3161         struct rtnl_link_stats64 temp;
3162         struct list_head *iter;
3163         struct slave *slave;
3164
3165         memset(stats, 0, sizeof(*stats));
3166
3167         read_lock_bh(&bond->lock);
3168         bond_for_each_slave(bond, slave, iter) {
3169                 const struct rtnl_link_stats64 *sstats =
3170                         dev_get_stats(slave->dev, &temp);
3171
3172                 stats->rx_packets += sstats->rx_packets;
3173                 stats->rx_bytes += sstats->rx_bytes;
3174                 stats->rx_errors += sstats->rx_errors;
3175                 stats->rx_dropped += sstats->rx_dropped;
3176
3177                 stats->tx_packets += sstats->tx_packets;
3178                 stats->tx_bytes += sstats->tx_bytes;
3179                 stats->tx_errors += sstats->tx_errors;
3180                 stats->tx_dropped += sstats->tx_dropped;
3181
3182                 stats->multicast += sstats->multicast;
3183                 stats->collisions += sstats->collisions;
3184
3185                 stats->rx_length_errors += sstats->rx_length_errors;
3186                 stats->rx_over_errors += sstats->rx_over_errors;
3187                 stats->rx_crc_errors += sstats->rx_crc_errors;
3188                 stats->rx_frame_errors += sstats->rx_frame_errors;
3189                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3190                 stats->rx_missed_errors += sstats->rx_missed_errors;
3191
3192                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3193                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3194                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3195                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3196                 stats->tx_window_errors += sstats->tx_window_errors;
3197         }
3198         read_unlock_bh(&bond->lock);
3199
3200         return stats;
3201 }
3202
3203 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3204 {
3205         struct bonding *bond = netdev_priv(bond_dev);
3206         struct net_device *slave_dev = NULL;
3207         struct ifbond k_binfo;
3208         struct ifbond __user *u_binfo = NULL;
3209         struct ifslave k_sinfo;
3210         struct ifslave __user *u_sinfo = NULL;
3211         struct mii_ioctl_data *mii = NULL;
3212         struct net *net;
3213         int res = 0;
3214
3215         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3216
3217         switch (cmd) {
3218         case SIOCGMIIPHY:
3219                 mii = if_mii(ifr);
3220                 if (!mii)
3221                         return -EINVAL;
3222
3223                 mii->phy_id = 0;
3224                 /* Fall Through */
3225         case SIOCGMIIREG:
3226                 /*
3227                  * We do this again just in case we were called by SIOCGMIIREG
3228                  * instead of SIOCGMIIPHY.
3229                  */
3230                 mii = if_mii(ifr);
3231                 if (!mii)
3232                         return -EINVAL;
3233
3234
3235                 if (mii->reg_num == 1) {
3236                         mii->val_out = 0;
3237                         read_lock(&bond->lock);
3238                         read_lock(&bond->curr_slave_lock);
3239                         if (netif_carrier_ok(bond->dev))
3240                                 mii->val_out = BMSR_LSTATUS;
3241
3242                         read_unlock(&bond->curr_slave_lock);
3243                         read_unlock(&bond->lock);
3244                 }
3245
3246                 return 0;
3247         case BOND_INFO_QUERY_OLD:
3248         case SIOCBONDINFOQUERY:
3249                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3250
3251                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3252                         return -EFAULT;
3253
3254                 res = bond_info_query(bond_dev, &k_binfo);
3255                 if (res == 0 &&
3256                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3257                         return -EFAULT;
3258
3259                 return res;
3260         case BOND_SLAVE_INFO_QUERY_OLD:
3261         case SIOCBONDSLAVEINFOQUERY:
3262                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3263
3264                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3265                         return -EFAULT;
3266
3267                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3268                 if (res == 0 &&
3269                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3270                         return -EFAULT;
3271
3272                 return res;
3273         default:
3274                 /* Go on */
3275                 break;
3276         }
3277
3278         net = dev_net(bond_dev);
3279
3280         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3281                 return -EPERM;
3282
3283         slave_dev = dev_get_by_name(net, ifr->ifr_slave);
3284
3285         pr_debug("slave_dev=%p:\n", slave_dev);
3286
3287         if (!slave_dev)
3288                 res = -ENODEV;
3289         else {
3290                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3291                 switch (cmd) {
3292                 case BOND_ENSLAVE_OLD:
3293                 case SIOCBONDENSLAVE:
3294                         res = bond_enslave(bond_dev, slave_dev);
3295                         break;
3296                 case BOND_RELEASE_OLD:
3297                 case SIOCBONDRELEASE:
3298                         res = bond_release(bond_dev, slave_dev);
3299                         break;
3300                 case BOND_SETHWADDR_OLD:
3301                 case SIOCBONDSETHWADDR:
3302                         bond_set_dev_addr(bond_dev, slave_dev);
3303                         res = 0;
3304                         break;
3305                 case BOND_CHANGE_ACTIVE_OLD:
3306                 case SIOCBONDCHANGEACTIVE:
3307                         res = bond_option_active_slave_set(bond, slave_dev);
3308                         break;
3309                 default:
3310                         res = -EOPNOTSUPP;
3311                 }
3312
3313                 dev_put(slave_dev);
3314         }
3315
3316         return res;
3317 }
3318
3319 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3320 {
3321         struct bonding *bond = netdev_priv(bond_dev);
3322
3323         if (change & IFF_PROMISC)
3324                 bond_set_promiscuity(bond,
3325                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3326
3327         if (change & IFF_ALLMULTI)
3328                 bond_set_allmulti(bond,
3329                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3330 }
3331
3332 static void bond_set_rx_mode(struct net_device *bond_dev)
3333 {
3334         struct bonding *bond = netdev_priv(bond_dev);
3335         struct list_head *iter;
3336         struct slave *slave;
3337
3338
3339         rcu_read_lock();
3340         if (USES_PRIMARY(bond->params.mode)) {
3341                 slave = rcu_dereference(bond->curr_active_slave);
3342                 if (slave) {
3343                         dev_uc_sync(slave->dev, bond_dev);
3344                         dev_mc_sync(slave->dev, bond_dev);
3345                 }
3346         } else {
3347                 bond_for_each_slave_rcu(bond, slave, iter) {
3348                         dev_uc_sync_multiple(slave->dev, bond_dev);
3349                         dev_mc_sync_multiple(slave->dev, bond_dev);
3350                 }
3351         }
3352         rcu_read_unlock();
3353 }
3354
3355 static int bond_neigh_init(struct neighbour *n)
3356 {
3357         struct bonding *bond = netdev_priv(n->dev);
3358         const struct net_device_ops *slave_ops;
3359         struct neigh_parms parms;
3360         struct slave *slave;
3361         int ret;
3362
3363         slave = bond_first_slave(bond);
3364         if (!slave)
3365                 return 0;
3366         slave_ops = slave->dev->netdev_ops;
3367         if (!slave_ops->ndo_neigh_setup)
3368                 return 0;
3369
3370         parms.neigh_setup = NULL;
3371         parms.neigh_cleanup = NULL;
3372         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3373         if (ret)
3374                 return ret;
3375
3376         /*
3377          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3378          * after the last slave has been detached.  Assumes that all slaves
3379          * utilize the same neigh_cleanup (true at this writing as only user
3380          * is ipoib).
3381          */
3382         n->parms->neigh_cleanup = parms.neigh_cleanup;
3383
3384         if (!parms.neigh_setup)
3385                 return 0;
3386
3387         return parms.neigh_setup(n);
3388 }
3389
3390 /*
3391  * The bonding ndo_neigh_setup is called at init time beofre any
3392  * slave exists. So we must declare proxy setup function which will
3393  * be used at run time to resolve the actual slave neigh param setup.
3394  *
3395  * It's also called by master devices (such as vlans) to setup their
3396  * underlying devices. In that case - do nothing, we're already set up from
3397  * our init.
3398  */
3399 static int bond_neigh_setup(struct net_device *dev,
3400                             struct neigh_parms *parms)
3401 {
3402         /* modify only our neigh_parms */
3403         if (parms->dev == dev)
3404                 parms->neigh_setup = bond_neigh_init;
3405
3406         return 0;
3407 }
3408
3409 /*
3410  * Change the MTU of all of a master's slaves to match the master
3411  */
3412 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3413 {
3414         struct bonding *bond = netdev_priv(bond_dev);
3415         struct slave *slave, *rollback_slave;
3416         struct list_head *iter;
3417         int res = 0;
3418
3419         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3420                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3421
3422         /* Can't hold bond->lock with bh disabled here since
3423          * some base drivers panic. On the other hand we can't
3424          * hold bond->lock without bh disabled because we'll
3425          * deadlock. The only solution is to rely on the fact
3426          * that we're under rtnl_lock here, and the slaves
3427          * list won't change. This doesn't solve the problem
3428          * of setting the slave's MTU while it is
3429          * transmitting, but the assumption is that the base
3430          * driver can handle that.
3431          *
3432          * TODO: figure out a way to safely iterate the slaves
3433          * list, but without holding a lock around the actual
3434          * call to the base driver.
3435          */
3436
3437         bond_for_each_slave(bond, slave, iter) {
3438                 pr_debug("s %p c_m %p\n",
3439                          slave,
3440                          slave->dev->netdev_ops->ndo_change_mtu);
3441
3442                 res = dev_set_mtu(slave->dev, new_mtu);
3443
3444                 if (res) {
3445                         /* If we failed to set the slave's mtu to the new value
3446                          * we must abort the operation even in ACTIVE_BACKUP
3447                          * mode, because if we allow the backup slaves to have
3448                          * different mtu values than the active slave we'll
3449                          * need to change their mtu when doing a failover. That
3450                          * means changing their mtu from timer context, which
3451                          * is probably not a good idea.
3452                          */
3453                         pr_debug("err %d %s\n", res, slave->dev->name);
3454                         goto unwind;
3455                 }
3456         }
3457
3458         bond_dev->mtu = new_mtu;
3459
3460         return 0;
3461
3462 unwind:
3463         /* unwind from head to the slave that failed */
3464         bond_for_each_slave(bond, rollback_slave, iter) {
3465                 int tmp_res;
3466
3467                 if (rollback_slave == slave)
3468                         break;
3469
3470                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3471                 if (tmp_res) {
3472                         pr_debug("unwind err %d dev %s\n",
3473                                  tmp_res, rollback_slave->dev->name);
3474                 }
3475         }
3476
3477         return res;
3478 }
3479
3480 /*
3481  * Change HW address
3482  *
3483  * Note that many devices must be down to change the HW address, and
3484  * downing the master releases all slaves.  We can make bonds full of
3485  * bonding devices to test this, however.
3486  */
3487 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3488 {
3489         struct bonding *bond = netdev_priv(bond_dev);
3490         struct slave *slave, *rollback_slave;
3491         struct sockaddr *sa = addr, tmp_sa;
3492         struct list_head *iter;
3493         int res = 0;
3494
3495         if (bond->params.mode == BOND_MODE_ALB)
3496                 return bond_alb_set_mac_address(bond_dev, addr);
3497
3498
3499         pr_debug("bond=%p, name=%s\n",
3500                  bond, bond_dev ? bond_dev->name : "None");
3501
3502         /* If fail_over_mac is enabled, do nothing and return success.
3503          * Returning an error causes ifenslave to fail.
3504          */
3505         if (bond->params.fail_over_mac)
3506                 return 0;
3507
3508         if (!is_valid_ether_addr(sa->sa_data))
3509                 return -EADDRNOTAVAIL;
3510
3511         /* Can't hold bond->lock with bh disabled here since
3512          * some base drivers panic. On the other hand we can't
3513          * hold bond->lock without bh disabled because we'll
3514          * deadlock. The only solution is to rely on the fact
3515          * that we're under rtnl_lock here, and the slaves
3516          * list won't change. This doesn't solve the problem
3517          * of setting the slave's hw address while it is
3518          * transmitting, but the assumption is that the base
3519          * driver can handle that.
3520          *
3521          * TODO: figure out a way to safely iterate the slaves
3522          * list, but without holding a lock around the actual
3523          * call to the base driver.
3524          */
3525
3526         bond_for_each_slave(bond, slave, iter) {
3527                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3528                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3529
3530                 if (slave_ops->ndo_set_mac_address == NULL) {
3531                         res = -EOPNOTSUPP;
3532                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3533                         goto unwind;
3534                 }
3535
3536                 res = dev_set_mac_address(slave->dev, addr);
3537                 if (res) {
3538                         /* TODO: consider downing the slave
3539                          * and retry ?
3540                          * User should expect communications
3541                          * breakage anyway until ARP finish
3542                          * updating, so...
3543                          */
3544                         pr_debug("err %d %s\n", res, slave->dev->name);
3545                         goto unwind;
3546                 }
3547         }
3548
3549         /* success */
3550         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3551         return 0;
3552
3553 unwind:
3554         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3555         tmp_sa.sa_family = bond_dev->type;
3556
3557         /* unwind from head to the slave that failed */
3558         bond_for_each_slave(bond, rollback_slave, iter) {
3559                 int tmp_res;
3560
3561                 if (rollback_slave == slave)
3562                         break;
3563
3564                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3565                 if (tmp_res) {
3566                         pr_debug("unwind err %d dev %s\n",
3567                                  tmp_res, rollback_slave->dev->name);
3568                 }
3569         }
3570
3571         return res;
3572 }
3573
3574 /**
3575  * bond_xmit_slave_id - transmit skb through slave with slave_id
3576  * @bond: bonding device that is transmitting
3577  * @skb: buffer to transmit
3578  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3579  *
3580  * This function tries to transmit through slave with slave_id but in case
3581  * it fails, it tries to find the first available slave for transmission.
3582  * The skb is consumed in all cases, thus the function is void.
3583  */
3584 void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3585 {
3586         struct list_head *iter;
3587         struct slave *slave;
3588         int i = slave_id;
3589
3590         /* Here we start from the slave with slave_id */
3591         bond_for_each_slave_rcu(bond, slave, iter) {
3592                 if (--i < 0) {
3593                         if (slave_can_tx(slave)) {
3594                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3595                                 return;
3596                         }
3597                 }
3598         }
3599
3600         /* Here we start from the first slave up to slave_id */
3601         i = slave_id;
3602         bond_for_each_slave_rcu(bond, slave, iter) {
3603                 if (--i < 0)
3604                         break;
3605                 if (slave_can_tx(slave)) {
3606                         bond_dev_queue_xmit(bond, skb, slave->dev);
3607                         return;
3608                 }
3609         }
3610         /* no slave that can tx has been found */
3611         kfree_skb(skb);
3612 }
3613
3614 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3615 {
3616         struct bonding *bond = netdev_priv(bond_dev);
3617         struct iphdr *iph = ip_hdr(skb);
3618         struct slave *slave;
3619
3620         /*
3621          * Start with the curr_active_slave that joined the bond as the
3622          * default for sending IGMP traffic.  For failover purposes one
3623          * needs to maintain some consistency for the interface that will
3624          * send the join/membership reports.  The curr_active_slave found
3625          * will send all of this type of traffic.
3626          */
3627         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3628                 slave = rcu_dereference(bond->curr_active_slave);
3629                 if (slave && slave_can_tx(slave))
3630                         bond_dev_queue_xmit(bond, skb, slave->dev);
3631                 else
3632                         bond_xmit_slave_id(bond, skb, 0);
3633         } else {
3634                 bond_xmit_slave_id(bond, skb,
3635                                    bond->rr_tx_counter++ % bond->slave_cnt);
3636         }
3637
3638         return NETDEV_TX_OK;
3639 }
3640
3641 /*
3642  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3643  * the bond has a usable interface.
3644  */
3645 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3646 {
3647         struct bonding *bond = netdev_priv(bond_dev);
3648         struct slave *slave;
3649
3650         slave = rcu_dereference(bond->curr_active_slave);
3651         if (slave)
3652                 bond_dev_queue_xmit(bond, skb, slave->dev);
3653         else
3654                 kfree_skb(skb);
3655
3656         return NETDEV_TX_OK;
3657 }
3658
3659 /* In bond_xmit_xor() , we determine the output device by using a pre-
3660  * determined xmit_hash_policy(), If the selected device is not enabled,
3661  * find the next active slave.
3662  */
3663 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3664 {
3665         struct bonding *bond = netdev_priv(bond_dev);
3666
3667         bond_xmit_slave_id(bond, skb, bond_xmit_hash(bond, skb, bond->slave_cnt));
3668
3669         return NETDEV_TX_OK;
3670 }
3671
3672 /* in broadcast mode, we send everything to all usable interfaces. */
3673 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3674 {
3675         struct bonding *bond = netdev_priv(bond_dev);
3676         struct slave *slave = NULL;
3677         struct list_head *iter;
3678
3679         bond_for_each_slave_rcu(bond, slave, iter) {
3680                 if (bond_is_last_slave(bond, slave))
3681                         break;
3682                 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
3683                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3684
3685                         if (!skb2) {
3686                                 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
3687                                        bond_dev->name);
3688                                 continue;
3689                         }
3690                         /* bond_dev_queue_xmit always returns 0 */
3691                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3692                 }
3693         }
3694         if (slave && IS_UP(slave->dev) && slave->link == BOND_LINK_UP)
3695                 bond_dev_queue_xmit(bond, skb, slave->dev);
3696         else
3697                 kfree_skb(skb);
3698
3699         return NETDEV_TX_OK;
3700 }
3701
3702 /*------------------------- Device initialization ---------------------------*/
3703
3704 /*
3705  * Lookup the slave that corresponds to a qid
3706  */
3707 static inline int bond_slave_override(struct bonding *bond,
3708                                       struct sk_buff *skb)
3709 {
3710         struct slave *slave = NULL;
3711         struct slave *check_slave;
3712         struct list_head *iter;
3713         int res = 1;
3714
3715         if (!skb->queue_mapping)
3716                 return 1;
3717
3718         /* Find out if any slaves have the same mapping as this skb. */
3719         bond_for_each_slave_rcu(bond, check_slave, iter) {
3720                 if (check_slave->queue_id == skb->queue_mapping) {
3721                         slave = check_slave;
3722                         break;
3723                 }
3724         }
3725
3726         /* If the slave isn't UP, use default transmit policy. */
3727         if (slave && slave->queue_id && IS_UP(slave->dev) &&
3728             (slave->link == BOND_LINK_UP)) {
3729                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3730         }
3731
3732         return res;
3733 }
3734
3735
3736 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
3737 {
3738         /*
3739          * This helper function exists to help dev_pick_tx get the correct
3740          * destination queue.  Using a helper function skips a call to
3741          * skb_tx_hash and will put the skbs in the queue we expect on their
3742          * way down to the bonding driver.
3743          */
3744         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3745
3746         /*
3747          * Save the original txq to restore before passing to the driver
3748          */
3749         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3750
3751         if (unlikely(txq >= dev->real_num_tx_queues)) {
3752                 do {
3753                         txq -= dev->real_num_tx_queues;
3754                 } while (txq >= dev->real_num_tx_queues);
3755         }
3756         return txq;
3757 }
3758
3759 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3760 {
3761         struct bonding *bond = netdev_priv(dev);
3762
3763         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
3764                 if (!bond_slave_override(bond, skb))
3765                         return NETDEV_TX_OK;
3766         }
3767
3768         switch (bond->params.mode) {
3769         case BOND_MODE_ROUNDROBIN:
3770                 return bond_xmit_roundrobin(skb, dev);
3771         case BOND_MODE_ACTIVEBACKUP:
3772                 return bond_xmit_activebackup(skb, dev);
3773         case BOND_MODE_XOR:
3774                 return bond_xmit_xor(skb, dev);
3775         case BOND_MODE_BROADCAST:
3776                 return bond_xmit_broadcast(skb, dev);
3777         case BOND_MODE_8023AD:
3778                 return bond_3ad_xmit_xor(skb, dev);
3779         case BOND_MODE_ALB:
3780         case BOND_MODE_TLB:
3781                 return bond_alb_xmit(skb, dev);
3782         default:
3783                 /* Should never happen, mode already checked */
3784                 pr_err("%s: Error: Unknown bonding mode %d\n",
3785                        dev->name, bond->params.mode);
3786                 WARN_ON_ONCE(1);
3787                 kfree_skb(skb);
3788                 return NETDEV_TX_OK;
3789         }
3790 }
3791
3792 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3793 {
3794         struct bonding *bond = netdev_priv(dev);
3795         netdev_tx_t ret = NETDEV_TX_OK;
3796
3797         /*
3798          * If we risk deadlock from transmitting this in the
3799          * netpoll path, tell netpoll to queue the frame for later tx
3800          */
3801         if (is_netpoll_tx_blocked(dev))
3802                 return NETDEV_TX_BUSY;
3803
3804         rcu_read_lock();
3805         if (bond_has_slaves(bond))
3806                 ret = __bond_start_xmit(skb, dev);
3807         else
3808                 kfree_skb(skb);
3809         rcu_read_unlock();
3810
3811         return ret;
3812 }
3813
3814 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3815                                      struct ethtool_cmd *ecmd)
3816 {
3817         struct bonding *bond = netdev_priv(bond_dev);
3818         unsigned long speed = 0;
3819         struct list_head *iter;
3820         struct slave *slave;
3821
3822         ecmd->duplex = DUPLEX_UNKNOWN;
3823         ecmd->port = PORT_OTHER;
3824
3825         /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
3826          * do not need to check mode.  Though link speed might not represent
3827          * the true receive or transmit bandwidth (not all modes are symmetric)
3828          * this is an accurate maximum.
3829          */
3830         read_lock(&bond->lock);
3831         bond_for_each_slave(bond, slave, iter) {
3832                 if (SLAVE_IS_OK(slave)) {
3833                         if (slave->speed != SPEED_UNKNOWN)
3834                                 speed += slave->speed;
3835                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
3836                             slave->duplex != DUPLEX_UNKNOWN)
3837                                 ecmd->duplex = slave->duplex;
3838                 }
3839         }
3840         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3841         read_unlock(&bond->lock);
3842
3843         return 0;
3844 }
3845
3846 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3847                                      struct ethtool_drvinfo *drvinfo)
3848 {
3849         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3850         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3851         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3852                  BOND_ABI_VERSION);
3853 }
3854
3855 static const struct ethtool_ops bond_ethtool_ops = {
3856         .get_drvinfo            = bond_ethtool_get_drvinfo,
3857         .get_settings           = bond_ethtool_get_settings,
3858         .get_link               = ethtool_op_get_link,
3859 };
3860
3861 static const struct net_device_ops bond_netdev_ops = {
3862         .ndo_init               = bond_init,
3863         .ndo_uninit             = bond_uninit,
3864         .ndo_open               = bond_open,
3865         .ndo_stop               = bond_close,
3866         .ndo_start_xmit         = bond_start_xmit,
3867         .ndo_select_queue       = bond_select_queue,
3868         .ndo_get_stats64        = bond_get_stats,
3869         .ndo_do_ioctl           = bond_do_ioctl,
3870         .ndo_change_rx_flags    = bond_change_rx_flags,
3871         .ndo_set_rx_mode        = bond_set_rx_mode,
3872         .ndo_change_mtu         = bond_change_mtu,
3873         .ndo_set_mac_address    = bond_set_mac_address,
3874         .ndo_neigh_setup        = bond_neigh_setup,
3875         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
3876         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
3877 #ifdef CONFIG_NET_POLL_CONTROLLER
3878         .ndo_netpoll_setup      = bond_netpoll_setup,
3879         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
3880         .ndo_poll_controller    = bond_poll_controller,
3881 #endif
3882         .ndo_add_slave          = bond_enslave,
3883         .ndo_del_slave          = bond_release,
3884         .ndo_fix_features       = bond_fix_features,
3885 };
3886
3887 static const struct device_type bond_type = {
3888         .name = "bond",
3889 };
3890
3891 static void bond_destructor(struct net_device *bond_dev)
3892 {
3893         struct bonding *bond = netdev_priv(bond_dev);
3894         if (bond->wq)
3895                 destroy_workqueue(bond->wq);
3896         free_netdev(bond_dev);
3897 }
3898
3899 void bond_setup(struct net_device *bond_dev)
3900 {
3901         struct bonding *bond = netdev_priv(bond_dev);
3902
3903         /* initialize rwlocks */
3904         rwlock_init(&bond->lock);
3905         rwlock_init(&bond->curr_slave_lock);
3906         bond->params = bonding_defaults;
3907
3908         /* Initialize pointers */
3909         bond->dev = bond_dev;
3910
3911         /* Initialize the device entry points */
3912         ether_setup(bond_dev);
3913         bond_dev->netdev_ops = &bond_netdev_ops;
3914         bond_dev->ethtool_ops = &bond_ethtool_ops;
3915
3916         bond_dev->destructor = bond_destructor;
3917
3918         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
3919
3920         /* Initialize the device options */
3921         bond_dev->tx_queue_len = 0;
3922         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
3923         bond_dev->priv_flags |= IFF_BONDING;
3924         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
3925
3926         /* At first, we block adding VLANs. That's the only way to
3927          * prevent problems that occur when adding VLANs over an
3928          * empty bond. The block will be removed once non-challenged
3929          * slaves are enslaved.
3930          */
3931         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
3932
3933         /* don't acquire bond device's netif_tx_lock when
3934          * transmitting */
3935         bond_dev->features |= NETIF_F_LLTX;
3936
3937         /* By default, we declare the bond to be fully
3938          * VLAN hardware accelerated capable. Special
3939          * care is taken in the various xmit functions
3940          * when there are slaves that are not hw accel
3941          * capable
3942          */
3943
3944         bond_dev->hw_features = BOND_VLAN_FEATURES |
3945                                 NETIF_F_HW_VLAN_CTAG_TX |
3946                                 NETIF_F_HW_VLAN_CTAG_RX |
3947                                 NETIF_F_HW_VLAN_CTAG_FILTER;
3948
3949         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
3950         bond_dev->features |= bond_dev->hw_features;
3951 }
3952
3953 /*
3954 * Destroy a bonding device.
3955 * Must be under rtnl_lock when this function is called.
3956 */
3957 static void bond_uninit(struct net_device *bond_dev)
3958 {
3959         struct bonding *bond = netdev_priv(bond_dev);
3960         struct list_head *iter;
3961         struct slave *slave;
3962
3963         bond_netpoll_cleanup(bond_dev);
3964
3965         /* Release the bonded slaves */
3966         bond_for_each_slave(bond, slave, iter)
3967                 __bond_release_one(bond_dev, slave->dev, true);
3968         pr_info("%s: released all slaves\n", bond_dev->name);
3969
3970         list_del(&bond->bond_list);
3971
3972         bond_debug_unregister(bond);
3973 }
3974
3975 /*------------------------- Module initialization ---------------------------*/
3976
3977 /*
3978  * Convert string input module parms.  Accept either the
3979  * number of the mode or its string name.  A bit complicated because
3980  * some mode names are substrings of other names, and calls from sysfs
3981  * may have whitespace in the name (trailing newlines, for example).
3982  */
3983 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
3984 {
3985         int modeint = -1, i, rv;
3986         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
3987
3988         for (p = (char *)buf; *p; p++)
3989                 if (!(isdigit(*p) || isspace(*p)))
3990                         break;
3991
3992         if (*p)
3993                 rv = sscanf(buf, "%20s", modestr);
3994         else
3995                 rv = sscanf(buf, "%d", &modeint);
3996
3997         if (!rv)
3998                 return -1;
3999
4000         for (i = 0; tbl[i].modename; i++) {
4001                 if (modeint == tbl[i].mode)
4002                         return tbl[i].mode;
4003                 if (strcmp(modestr, tbl[i].modename) == 0)
4004                         return tbl[i].mode;
4005         }
4006
4007         return -1;
4008 }
4009
4010 static int bond_check_params(struct bond_params *params)
4011 {
4012         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4013         int arp_all_targets_value;
4014
4015         /*
4016          * Convert string parameters.
4017          */
4018         if (mode) {
4019                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4020                 if (bond_mode == -1) {
4021                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4022                                mode == NULL ? "NULL" : mode);
4023                         return -EINVAL;
4024                 }
4025         }
4026
4027         if (xmit_hash_policy) {
4028                 if ((bond_mode != BOND_MODE_XOR) &&
4029                     (bond_mode != BOND_MODE_8023AD)) {
4030                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4031                                bond_mode_name(bond_mode));
4032                 } else {
4033                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4034                                                         xmit_hashtype_tbl);
4035                         if (xmit_hashtype == -1) {
4036                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4037                                        xmit_hash_policy == NULL ? "NULL" :
4038                                        xmit_hash_policy);
4039                                 return -EINVAL;
4040                         }
4041                 }
4042         }
4043
4044         if (lacp_rate) {
4045                 if (bond_mode != BOND_MODE_8023AD) {
4046                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4047                                 bond_mode_name(bond_mode));
4048                 } else {
4049                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4050                         if (lacp_fast == -1) {
4051                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4052                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4053                                 return -EINVAL;
4054                         }
4055                 }
4056         }
4057
4058         if (ad_select) {
4059                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4060                 if (params->ad_select == -1) {
4061                         pr_err("Error: Invalid ad_select \"%s\"\n",
4062                                ad_select == NULL ? "NULL" : ad_select);
4063                         return -EINVAL;
4064                 }
4065
4066                 if (bond_mode != BOND_MODE_8023AD) {
4067                         pr_warning("ad_select param only affects 802.3ad mode\n");
4068                 }
4069         } else {
4070                 params->ad_select = BOND_AD_STABLE;
4071         }
4072
4073         if (max_bonds < 0) {
4074                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4075                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4076                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4077         }
4078
4079         if (miimon < 0) {
4080                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4081                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4082                 miimon = BOND_LINK_MON_INTERV;
4083         }
4084
4085         if (updelay < 0) {
4086                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4087                            updelay, INT_MAX);
4088                 updelay = 0;
4089         }
4090
4091         if (downdelay < 0) {
4092                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4093                            downdelay, INT_MAX);
4094                 downdelay = 0;
4095         }
4096
4097         if ((use_carrier != 0) && (use_carrier != 1)) {
4098                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4099                            use_carrier);
4100                 use_carrier = 1;
4101         }
4102
4103         if (num_peer_notif < 0 || num_peer_notif > 255) {
4104                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4105                            num_peer_notif);
4106                 num_peer_notif = 1;
4107         }
4108
4109         /* reset values for 802.3ad */
4110         if (bond_mode == BOND_MODE_8023AD) {
4111                 if (!miimon) {
4112                         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");
4113                         pr_warning("Forcing miimon to 100msec\n");
4114                         miimon = 100;
4115                 }
4116         }
4117
4118         if (tx_queues < 1 || tx_queues > 255) {
4119                 pr_warning("Warning: tx_queues (%d) should be between "
4120                            "1 and 255, resetting to %d\n",
4121                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4122                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4123         }
4124
4125         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4126                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4127                            "not of valid value (0/1), so it was set to "
4128                            "0\n", all_slaves_active);
4129                 all_slaves_active = 0;
4130         }
4131
4132         if (resend_igmp < 0 || resend_igmp > 255) {
4133                 pr_warning("Warning: resend_igmp (%d) should be between "
4134                            "0 and 255, resetting to %d\n",
4135                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4136                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4137         }
4138
4139         /* reset values for TLB/ALB */
4140         if ((bond_mode == BOND_MODE_TLB) ||
4141             (bond_mode == BOND_MODE_ALB)) {
4142                 if (!miimon) {
4143                         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");
4144                         pr_warning("Forcing miimon to 100msec\n");
4145                         miimon = 100;
4146                 }
4147         }
4148
4149         if (bond_mode == BOND_MODE_ALB) {
4150                 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",
4151                           updelay);
4152         }
4153
4154         if (!miimon) {
4155                 if (updelay || downdelay) {
4156                         /* just warn the user the up/down delay will have
4157                          * no effect since miimon is zero...
4158                          */
4159                         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",
4160                                    updelay, downdelay);
4161                 }
4162         } else {
4163                 /* don't allow arp monitoring */
4164                 if (arp_interval) {
4165                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4166                                    miimon, arp_interval);
4167                         arp_interval = 0;
4168                 }
4169
4170                 if ((updelay % miimon) != 0) {
4171                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4172                                    updelay, miimon,
4173                                    (updelay / miimon) * miimon);
4174                 }
4175
4176                 updelay /= miimon;
4177
4178                 if ((downdelay % miimon) != 0) {
4179                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4180                                    downdelay, miimon,
4181                                    (downdelay / miimon) * miimon);
4182                 }
4183
4184                 downdelay /= miimon;
4185         }
4186
4187         if (arp_interval < 0) {
4188                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4189                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4190                 arp_interval = BOND_LINK_ARP_INTERV;
4191         }
4192
4193         for (arp_ip_count = 0, i = 0;
4194              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4195                 /* not complete check, but should be good enough to
4196                    catch mistakes */
4197                 __be32 ip = in_aton(arp_ip_target[i]);
4198                 if (!isdigit(arp_ip_target[i][0]) || ip == 0 ||
4199                     ip == htonl(INADDR_BROADCAST)) {
4200                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4201                                    arp_ip_target[i]);
4202                         arp_interval = 0;
4203                 } else {
4204                         if (bond_get_targets_ip(arp_target, ip) == -1)
4205                                 arp_target[arp_ip_count++] = ip;
4206                         else
4207                                 pr_warning("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4208                                            &ip);
4209                 }
4210         }
4211
4212         if (arp_interval && !arp_ip_count) {
4213                 /* don't allow arping if no arp_ip_target given... */
4214                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4215                            arp_interval);
4216                 arp_interval = 0;
4217         }
4218
4219         if (arp_validate) {
4220                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4221                         pr_err("arp_validate only supported in active-backup mode\n");
4222                         return -EINVAL;
4223                 }
4224                 if (!arp_interval) {
4225                         pr_err("arp_validate requires arp_interval\n");
4226                         return -EINVAL;
4227                 }
4228
4229                 arp_validate_value = bond_parse_parm(arp_validate,
4230                                                      arp_validate_tbl);
4231                 if (arp_validate_value == -1) {
4232                         pr_err("Error: invalid arp_validate \"%s\"\n",
4233                                arp_validate == NULL ? "NULL" : arp_validate);
4234                         return -EINVAL;
4235                 }
4236         } else
4237                 arp_validate_value = 0;
4238
4239         arp_all_targets_value = 0;
4240         if (arp_all_targets) {
4241                 arp_all_targets_value = bond_parse_parm(arp_all_targets,
4242                                                         arp_all_targets_tbl);
4243
4244                 if (arp_all_targets_value == -1) {
4245                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4246                                arp_all_targets);
4247                         arp_all_targets_value = 0;
4248                 }
4249         }
4250
4251         if (miimon) {
4252                 pr_info("MII link monitoring set to %d ms\n", miimon);
4253         } else if (arp_interval) {
4254                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4255                         arp_interval,
4256                         arp_validate_tbl[arp_validate_value].modename,
4257                         arp_ip_count);
4258
4259                 for (i = 0; i < arp_ip_count; i++)
4260                         pr_info(" %s", arp_ip_target[i]);
4261
4262                 pr_info("\n");
4263
4264         } else if (max_bonds) {
4265                 /* miimon and arp_interval not set, we need one so things
4266                  * work as expected, see bonding.txt for details
4267                  */
4268                 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");
4269         }
4270
4271         if (primary && !USES_PRIMARY(bond_mode)) {
4272                 /* currently, using a primary only makes sense
4273                  * in active backup, TLB or ALB modes
4274                  */
4275                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4276                            primary, bond_mode_name(bond_mode));
4277                 primary = NULL;
4278         }
4279
4280         if (primary && primary_reselect) {
4281                 primary_reselect_value = bond_parse_parm(primary_reselect,
4282                                                          pri_reselect_tbl);
4283                 if (primary_reselect_value == -1) {
4284                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4285                                primary_reselect ==
4286                                         NULL ? "NULL" : primary_reselect);
4287                         return -EINVAL;
4288                 }
4289         } else {
4290                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4291         }
4292
4293         if (fail_over_mac) {
4294                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4295                                                       fail_over_mac_tbl);
4296                 if (fail_over_mac_value == -1) {
4297                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4298                                arp_validate == NULL ? "NULL" : arp_validate);
4299                         return -EINVAL;
4300                 }
4301
4302                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4303                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4304         } else {
4305                 fail_over_mac_value = BOND_FOM_NONE;
4306         }
4307
4308         /* fill params struct with the proper values */
4309         params->mode = bond_mode;
4310         params->xmit_policy = xmit_hashtype;
4311         params->miimon = miimon;
4312         params->num_peer_notif = num_peer_notif;
4313         params->arp_interval = arp_interval;
4314         params->arp_validate = arp_validate_value;
4315         params->arp_all_targets = arp_all_targets_value;
4316         params->updelay = updelay;
4317         params->downdelay = downdelay;
4318         params->use_carrier = use_carrier;
4319         params->lacp_fast = lacp_fast;
4320         params->primary[0] = 0;
4321         params->primary_reselect = primary_reselect_value;
4322         params->fail_over_mac = fail_over_mac_value;
4323         params->tx_queues = tx_queues;
4324         params->all_slaves_active = all_slaves_active;
4325         params->resend_igmp = resend_igmp;
4326         params->min_links = min_links;
4327         params->lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4328
4329         if (primary) {
4330                 strncpy(params->primary, primary, IFNAMSIZ);
4331                 params->primary[IFNAMSIZ - 1] = 0;
4332         }
4333
4334         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4335
4336         return 0;
4337 }
4338
4339 static struct lock_class_key bonding_netdev_xmit_lock_key;
4340 static struct lock_class_key bonding_netdev_addr_lock_key;
4341 static struct lock_class_key bonding_tx_busylock_key;
4342
4343 static void bond_set_lockdep_class_one(struct net_device *dev,
4344                                        struct netdev_queue *txq,
4345                                        void *_unused)
4346 {
4347         lockdep_set_class(&txq->_xmit_lock,
4348                           &bonding_netdev_xmit_lock_key);
4349 }
4350
4351 static void bond_set_lockdep_class(struct net_device *dev)
4352 {
4353         lockdep_set_class(&dev->addr_list_lock,
4354                           &bonding_netdev_addr_lock_key);
4355         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4356         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4357 }
4358
4359 /*
4360  * Called from registration process
4361  */
4362 static int bond_init(struct net_device *bond_dev)
4363 {
4364         struct bonding *bond = netdev_priv(bond_dev);
4365         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4366         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4367
4368         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4369
4370         /*
4371          * Initialize locks that may be required during
4372          * en/deslave operations.  All of the bond_open work
4373          * (of which this is part) should really be moved to
4374          * a phase prior to dev_open
4375          */
4376         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4377         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4378
4379         bond->wq = create_singlethread_workqueue(bond_dev->name);
4380         if (!bond->wq)
4381                 return -ENOMEM;
4382
4383         bond_set_lockdep_class(bond_dev);
4384
4385         list_add_tail(&bond->bond_list, &bn->dev_list);
4386
4387         bond_prepare_sysfs_group(bond);
4388
4389         bond_debug_register(bond);
4390
4391         /* Ensure valid dev_addr */
4392         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4393             bond_dev->addr_assign_type == NET_ADDR_PERM)
4394                 eth_hw_addr_random(bond_dev);
4395
4396         return 0;
4397 }
4398
4399 unsigned int bond_get_num_tx_queues(void)
4400 {
4401         return tx_queues;
4402 }
4403
4404 /* Create a new bond based on the specified name and bonding parameters.
4405  * If name is NULL, obtain a suitable "bond%d" name for us.
4406  * Caller must NOT hold rtnl_lock; we need to release it here before we
4407  * set up our sysfs entries.
4408  */
4409 int bond_create(struct net *net, const char *name)
4410 {
4411         struct net_device *bond_dev;
4412         int res;
4413
4414         rtnl_lock();
4415
4416         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4417                                    name ? name : "bond%d",
4418                                    bond_setup, tx_queues);
4419         if (!bond_dev) {
4420                 pr_err("%s: eek! can't alloc netdev!\n", name);
4421                 rtnl_unlock();
4422                 return -ENOMEM;
4423         }
4424
4425         dev_net_set(bond_dev, net);
4426         bond_dev->rtnl_link_ops = &bond_link_ops;
4427
4428         res = register_netdevice(bond_dev);
4429
4430         netif_carrier_off(bond_dev);
4431
4432         rtnl_unlock();
4433         if (res < 0)
4434                 bond_destructor(bond_dev);
4435         return res;
4436 }
4437
4438 static int __net_init bond_net_init(struct net *net)
4439 {
4440         struct bond_net *bn = net_generic(net, bond_net_id);
4441
4442         bn->net = net;
4443         INIT_LIST_HEAD(&bn->dev_list);
4444
4445         bond_create_proc_dir(bn);
4446         bond_create_sysfs(bn);
4447
4448         return 0;
4449 }
4450
4451 static void __net_exit bond_net_exit(struct net *net)
4452 {
4453         struct bond_net *bn = net_generic(net, bond_net_id);
4454         struct bonding *bond, *tmp_bond;
4455         LIST_HEAD(list);
4456
4457         bond_destroy_sysfs(bn);
4458         bond_destroy_proc_dir(bn);
4459
4460         /* Kill off any bonds created after unregistering bond rtnl ops */
4461         rtnl_lock();
4462         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4463                 unregister_netdevice_queue(bond->dev, &list);
4464         unregister_netdevice_many(&list);
4465         rtnl_unlock();
4466 }
4467
4468 static struct pernet_operations bond_net_ops = {
4469         .init = bond_net_init,
4470         .exit = bond_net_exit,
4471         .id   = &bond_net_id,
4472         .size = sizeof(struct bond_net),
4473 };
4474
4475 static int __init bonding_init(void)
4476 {
4477         int i;
4478         int res;
4479
4480         pr_info("%s", bond_version);
4481
4482         res = bond_check_params(&bonding_defaults);
4483         if (res)
4484                 goto out;
4485
4486         res = register_pernet_subsys(&bond_net_ops);
4487         if (res)
4488                 goto out;
4489
4490         res = bond_netlink_init();
4491         if (res)
4492                 goto err_link;
4493
4494         bond_create_debugfs();
4495
4496         for (i = 0; i < max_bonds; i++) {
4497                 res = bond_create(&init_net, NULL);
4498                 if (res)
4499                         goto err;
4500         }
4501
4502         register_netdevice_notifier(&bond_netdev_notifier);
4503 out:
4504         return res;
4505 err:
4506         bond_netlink_fini();
4507 err_link:
4508         unregister_pernet_subsys(&bond_net_ops);
4509         goto out;
4510
4511 }
4512
4513 static void __exit bonding_exit(void)
4514 {
4515         unregister_netdevice_notifier(&bond_netdev_notifier);
4516
4517         bond_destroy_debugfs();
4518
4519         bond_netlink_fini();
4520         unregister_pernet_subsys(&bond_net_ops);
4521
4522 #ifdef CONFIG_NET_POLL_CONTROLLER
4523         /*
4524          * Make sure we don't have an imbalance on our netpoll blocking
4525          */
4526         WARN_ON(atomic_read(&netpoll_block_tx));
4527 #endif
4528 }
4529
4530 module_init(bonding_init);
4531 module_exit(bonding_exit);
4532 MODULE_LICENSE("GPL");
4533 MODULE_VERSION(DRV_VERSION);
4534 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4535 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");