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

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/fcntl.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/ptrace.h>
  42 #include <linux/ioport.h>
  43 #include <linux/in.h>
  44 #include <net/ip.h>
  45 #include <linux/ip.h>
  46 #include <linux/tcp.h>
  47 #include <linux/udp.h>
  48 #include <linux/slab.h>
  49 #include <linux/string.h>
  50 #include <linux/init.h>
  51 #include <linux/timer.h>
  52 #include <linux/socket.h>
  53 #include <linux/ctype.h>
  54 #include <linux/inet.h>
  55 #include <linux/bitops.h>
  56 #include <linux/io.h>
  57 #include <asm/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 <linux/reciprocal_div.h>
  83 #include "bonding.h"
  84 #include "bond_3ad.h"
  85 #include "bond_alb.h"
  86
  87 /*---------------------------- Module parameters ----------------------------*/
  88
  89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  90 #define BOND_LINK_MON_INTERV    0
  91 #define BOND_LINK_ARP_INTERV    0
  92
  93 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  94 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  95 static int num_peer_notif = 1;
  96 static int miimon       = BOND_LINK_MON_INTERV;
  97 static int updelay;
  98 static int downdelay;
  99 static int use_carrier  = 1;
 100 static char *mode;
 101 static char *primary;
 102 static char *primary_reselect;
 103 static char *lacp_rate;
 104 static int min_links;
 105 static char *ad_select;
 106 static char *xmit_hash_policy;
 107 static int arp_interval = BOND_LINK_ARP_INTERV;
 108 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 109 static char *arp_validate;
 110 static char *arp_all_targets;
 111 static char *fail_over_mac;
 112 static int all_slaves_active;
 113 static struct bond_params bonding_defaults;
 114 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 115 static int packets_per_slave = 1;
 116 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 117
 118 module_param(max_bonds, int, 0);
 119 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 120 module_param(tx_queues, int, 0);
 121 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 122 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 123 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 124                                "failover event (alias of num_unsol_na)");
 125 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 126 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 127                                "failover event (alias of num_grat_arp)");
 128 module_param(miimon, int, 0);
 129 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 130 module_param(updelay, int, 0);
 131 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 132 module_param(downdelay, int, 0);
 133 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 134                             "in milliseconds");
 135 module_param(use_carrier, int, 0);
 136 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 137                               "0 for off, 1 for on (default)");
 138 module_param(mode, charp, 0);
 139 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 140                        "1 for active-backup, 2 for balance-xor, "
 141                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 142                        "6 for balance-alb");
 143 module_param(primary, charp, 0);
 144 MODULE_PARM_DESC(primary, "Primary network device to use");
 145 module_param(primary_reselect, charp, 0);
 146 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 147                                    "once it comes up; "
 148                                    "0 for always (default), "
 149                                    "1 for only if speed of primary is "
 150                                    "better, "
 151                                    "2 for only on active slave "
 152                                    "failure");
 153 module_param(lacp_rate, charp, 0);
 154 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 155                             "0 for slow, 1 for fast");
 156 module_param(ad_select, charp, 0);
 157 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
 158                             "0 for stable (default), 1 for bandwidth, "
 159                             "2 for count");
 160 module_param(min_links, int, 0);
 161 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 162
 163 module_param(xmit_hash_policy, charp, 0);
 164 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 165                                    "0 for layer 2 (default), 1 for layer 3+4, "
 166                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 167                                    "4 for encap layer 3+4");
 168 module_param(arp_interval, int, 0);
 169 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 170 module_param_array(arp_ip_target, charp, NULL, 0);
 171 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 172 module_param(arp_validate, charp, 0);
 173 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 174                                "0 for none (default), 1 for active, "
 175                                "2 for backup, 3 for all");
 176 module_param(arp_all_targets, charp, 0);
 177 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 178 module_param(fail_over_mac, charp, 0);
 179 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 180                                 "the same MAC; 0 for none (default), "
 181                                 "1 for active, 2 for follow");
 182 module_param(all_slaves_active, int, 0);
 183 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 184                                      "by setting active flag for all slaves; "
 185                                      "0 for never (default), 1 for always.");
 186 module_param(resend_igmp, int, 0);
 187 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 188                               "link failure");
 189 module_param(packets_per_slave, int, 0);
 190 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 191                                     "mode; 0 for a random slave, 1 packet per "
 192                                     "slave (default), >1 packets per slave.");
 193 module_param(lp_interval, uint, 0);
 194 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 195                               "the bonding driver sends learning packets to "
 196                               "each slaves peer switch. The default is 1.");
 197
 198 /*----------------------------- Global variables ----------------------------*/
 199
 200 #ifdef CONFIG_NET_POLL_CONTROLLER
 201 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 202 #endif
 203
 204 int bond_net_id __read_mostly;
 205
 206 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 207 static int arp_ip_count;
 208 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 209 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 210 static int lacp_fast;
 211
 212 const struct bond_parm_tbl bond_lacp_tbl[] = {
 213 {       "slow",         AD_LACP_SLOW},
 214 {       "fast",         AD_LACP_FAST},
 215 {       NULL,           -1},
 216 };
 217
 218 const struct bond_parm_tbl bond_mode_tbl[] = {
 219 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 220 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 221 {       "balance-xor",          BOND_MODE_XOR},
 222 {       "broadcast",            BOND_MODE_BROADCAST},
 223 {       "802.3ad",              BOND_MODE_8023AD},
 224 {       "balance-tlb",          BOND_MODE_TLB},
 225 {       "balance-alb",          BOND_MODE_ALB},
 226 {       NULL,                   -1},
 227 };
 228
 229 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 230 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 231 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 232 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 233 {       "encap2+3",             BOND_XMIT_POLICY_ENCAP23},
 234 {       "encap3+4",             BOND_XMIT_POLICY_ENCAP34},
 235 {       NULL,                   -1},
 236 };
 237
 238 const struct bond_parm_tbl arp_all_targets_tbl[] = {
 239 {       "any",                  BOND_ARP_TARGETS_ANY},
 240 {       "all",                  BOND_ARP_TARGETS_ALL},
 241 {       NULL,                   -1},
 242 };
 243
 244 const struct bond_parm_tbl arp_validate_tbl[] = {
 245 {       "none",                 BOND_ARP_VALIDATE_NONE},
 246 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 247 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 248 {       "all",                  BOND_ARP_VALIDATE_ALL},
 249 {       NULL,                   -1},
 250 };
 251
 252 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 253 {       "none",                 BOND_FOM_NONE},
 254 {       "active",               BOND_FOM_ACTIVE},
 255 {       "follow",               BOND_FOM_FOLLOW},
 256 {       NULL,                   -1},
 257 };
 258
 259 const struct bond_parm_tbl pri_reselect_tbl[] = {
 260 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 261 {       "better",               BOND_PRI_RESELECT_BETTER},
 262 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 263 {       NULL,                   -1},
 264 };
 265
 266 struct bond_parm_tbl ad_select_tbl[] = {
 267 {       "stable",       BOND_AD_STABLE},
 268 {       "bandwidth",    BOND_AD_BANDWIDTH},
 269 {       "count",        BOND_AD_COUNT},
 270 {       NULL,           -1},
 271 };
 272
 273 /*-------------------------- Forward declarations ---------------------------*/
 274
 275 static int bond_init(struct net_device *bond_dev);
 276 static void bond_uninit(struct net_device *bond_dev);
 277
 278 /*---------------------------- General routines -----------------------------*/
 279
 280 const char *bond_mode_name(int mode)
 281 {
 282         static const char *names[] = {
 283                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 284                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 285                 [BOND_MODE_XOR] = "load balancing (xor)",
 286                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 287                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 288                 [BOND_MODE_TLB] = "transmit load balancing",
 289                 [BOND_MODE_ALB] = "adaptive load balancing",
 290         };
 291
 292         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 293                 return "unknown";
 294
 295         return names[mode];
 296 }
 297
 298 /*---------------------------------- VLAN -----------------------------------*/
 299
 300 /**
 301  * bond_dev_queue_xmit - Prepare skb for xmit.
 302  *
 303  * @bond: bond device that got this skb for tx.
 304  * @skb: hw accel VLAN tagged skb to transmit
 305  * @slave_dev: slave that is supposed to xmit this skbuff
 306  */
 307 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 308                         struct net_device *slave_dev)
 309 {
 310         skb->dev = slave_dev;
 311
 312         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 313                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 314         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
 315
 316         if (unlikely(netpoll_tx_running(bond->dev)))
 317                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 318         else
 319                 dev_queue_xmit(skb);
 320 }
 321
 322 /*
 323  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 324  * We don't protect the slave list iteration with a lock because:
 325  * a. This operation is performed in IOCTL context,
 326  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 327  * c. Holding a lock with BH disabled while directly calling a base driver
 328  *    entry point is generally a BAD idea.
 329  *
 330  * The design of synchronization/protection for this operation in the 8021q
 331  * module is good for one or more VLAN devices over a single physical device
 332  * and cannot be extended for a teaming solution like bonding, so there is a
 333  * potential race condition here where a net device from the vlan group might
 334  * be referenced (either by a base driver or the 8021q code) while it is being
 335  * removed from the system. However, it turns out we're not making matters
 336  * worse, and if it works for regular VLAN usage it will work here too.
 337 */
 338
 339 /**
 340  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 341  * @bond_dev: bonding net device that got called
 342  * @vid: vlan id being added
 343  */
 344 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 345                                 __be16 proto, u16 vid)
 346 {
 347         struct bonding *bond = netdev_priv(bond_dev);
 348         struct slave *slave, *rollback_slave;
 349         struct list_head *iter;
 350         int res;
 351
 352         bond_for_each_slave(bond, slave, iter) {
 353                 res = vlan_vid_add(slave->dev, proto, vid);
 354                 if (res)
 355                         goto unwind;
 356         }
 357
 358         return 0;
 359
 360 unwind:
 361         /* unwind to the slave that failed */
 362         bond_for_each_slave(bond, rollback_slave, iter) {
 363                 if (rollback_slave == slave)
 364                         break;
 365
 366                 vlan_vid_del(rollback_slave->dev, proto, vid);
 367         }
 368
 369         return res;
 370 }
 371
 372 /**
 373  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 374  * @bond_dev: bonding net device that got called
 375  * @vid: vlan id being removed
 376  */
 377 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 378                                  __be16 proto, u16 vid)
 379 {
 380         struct bonding *bond = netdev_priv(bond_dev);
 381         struct list_head *iter;
 382         struct slave *slave;
 383
 384         bond_for_each_slave(bond, slave, iter)
 385                 vlan_vid_del(slave->dev, proto, vid);
 386
 387         if (bond_is_lb(bond))
 388                 bond_alb_clear_vlan(bond, vid);
 389
 390         return 0;
 391 }
 392
 393 /*------------------------------- Link status -------------------------------*/
 394
 395 /*
 396  * Set the carrier state for the master according to the state of its
 397  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 398  * do special 802.3ad magic.
 399  *
 400  * Returns zero if carrier state does not change, nonzero if it does.
 401  */
 402 static int bond_set_carrier(struct bonding *bond)
 403 {
 404         struct list_head *iter;
 405         struct slave *slave;
 406
 407         if (!bond_has_slaves(bond))
 408                 goto down;
 409
 410         if (bond->params.mode == BOND_MODE_8023AD)
 411                 return bond_3ad_set_carrier(bond);
 412
 413         bond_for_each_slave(bond, slave, iter) {
 414                 if (slave->link == BOND_LINK_UP) {
 415                         if (!netif_carrier_ok(bond->dev)) {
 416                                 netif_carrier_on(bond->dev);
 417                                 return 1;
 418                         }
 419                         return 0;
 420                 }
 421         }
 422
 423 down:
 424         if (netif_carrier_ok(bond->dev)) {
 425                 netif_carrier_off(bond->dev);
 426                 return 1;
 427         }
 428         return 0;
 429 }
 430
 431 /*
 432  * Get link speed and duplex from the slave's base driver
 433  * using ethtool. If for some reason the call fails or the
 434  * values are invalid, set speed and duplex to -1,
 435  * and return.
 436  */
 437 static void bond_update_speed_duplex(struct slave *slave)
 438 {
 439         struct net_device *slave_dev = slave->dev;
 440         struct ethtool_cmd ecmd;
 441         u32 slave_speed;
 442         int res;
 443
 444         slave->speed = SPEED_UNKNOWN;
 445         slave->duplex = DUPLEX_UNKNOWN;
 446
 447         res = __ethtool_get_settings(slave_dev, &ecmd);
 448         if (res < 0)
 449                 return;
 450
 451         slave_speed = ethtool_cmd_speed(&ecmd);
 452         if (slave_speed == 0 || slave_speed == ((__u32) -1))
 453                 return;
 454
 455         switch (ecmd.duplex) {
 456         case DUPLEX_FULL:
 457         case DUPLEX_HALF:
 458                 break;
 459         default:
 460                 return;
 461         }
 462
 463         slave->speed = slave_speed;
 464         slave->duplex = ecmd.duplex;
 465
 466         return;
 467 }
 468
 469 /*
 470  * if <dev> supports MII link status reporting, check its link status.
 471  *
 472  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 473  * depending upon the setting of the use_carrier parameter.
 474  *
 475  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 476  * can't tell and just pretend it is), or 0, meaning that the link is
 477  * down.
 478  *
 479  * If reporting is non-zero, instead of faking link up, return -1 if
 480  * both ETHTOOL and MII ioctls fail (meaning the device does not
 481  * support them).  If use_carrier is set, return whatever it says.
 482  * It'd be nice if there was a good way to tell if a driver supports
 483  * netif_carrier, but there really isn't.
 484  */
 485 static int bond_check_dev_link(struct bonding *bond,
 486                                struct net_device *slave_dev, int reporting)
 487 {
 488         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 489         int (*ioctl)(struct net_device *, struct ifreq *, int);
 490         struct ifreq ifr;
 491         struct mii_ioctl_data *mii;
 492
 493         if (!reporting && !netif_running(slave_dev))
 494                 return 0;
 495
 496         if (bond->params.use_carrier)
 497                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 498
 499         /* Try to get link status using Ethtool first. */
 500         if (slave_dev->ethtool_ops->get_link)
 501                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 502                         BMSR_LSTATUS : 0;
 503
 504         /* Ethtool can't be used, fallback to MII ioctls. */
 505         ioctl = slave_ops->ndo_do_ioctl;
 506         if (ioctl) {
 507                 /* TODO: set pointer to correct ioctl on a per team member */
 508                 /*       bases to make this more efficient. that is, once  */
 509                 /*       we determine the correct ioctl, we will always    */
 510                 /*       call it and not the others for that team          */
 511                 /*       member.                                           */
 512
 513                 /*
 514                  * We cannot assume that SIOCGMIIPHY will also read a
 515                  * register; not all network drivers (e.g., e100)
 516                  * support that.
 517                  */
 518
 519                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 520                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 521                 mii = if_mii(&ifr);
 522                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 523                         mii->reg_num = MII_BMSR;
 524                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 525                                 return mii->val_out & BMSR_LSTATUS;
 526                 }
 527         }
 528
 529         /*
 530          * If reporting, report that either there's no dev->do_ioctl,
 531          * or both SIOCGMIIREG and get_link failed (meaning that we
 532          * cannot report link status).  If not reporting, pretend
 533          * we're ok.
 534          */
 535         return reporting ? -1 : BMSR_LSTATUS;
 536 }
 537
 538 /*----------------------------- Multicast list ------------------------------*/
 539
 540 /*
 541  * Push the promiscuity flag down to appropriate slaves
 542  */
 543 static int bond_set_promiscuity(struct bonding *bond, int inc)
 544 {
 545         struct list_head *iter;
 546         int err = 0;
 547
 548         if (USES_PRIMARY(bond->params.mode)) {
 549                 /* write lock already acquired */
 550                 if (bond->curr_active_slave) {
 551                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 552                                                   inc);
 553                 }
 554         } else {
 555                 struct slave *slave;
 556
 557                 bond_for_each_slave(bond, slave, iter) {
 558                         err = dev_set_promiscuity(slave->dev, inc);
 559                         if (err)
 560                                 return err;
 561                 }
 562         }
 563         return err;
 564 }
 565
 566 /*
 567  * Push the allmulti flag down to all slaves
 568  */
 569 static int bond_set_allmulti(struct bonding *bond, int inc)
 570 {
 571         struct list_head *iter;
 572         int err = 0;
 573
 574         if (USES_PRIMARY(bond->params.mode)) {
 575                 /* write lock already acquired */
 576                 if (bond->curr_active_slave) {
 577                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 578                                                inc);
 579                 }
 580         } else {
 581                 struct slave *slave;
 582
 583                 bond_for_each_slave(bond, slave, iter) {
 584                         err = dev_set_allmulti(slave->dev, inc);
 585                         if (err)
 586                                 return err;
 587                 }
 588         }
 589         return err;
 590 }
 591
 592 /*
 593  * Retrieve the list of registered multicast addresses for the bonding
 594  * device and retransmit an IGMP JOIN request to the current active
 595  * slave.
 596  */
 597 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 598 {
 599         struct bonding *bond = container_of(work, struct bonding,
 600                                             mcast_work.work);
 601
 602         if (!rtnl_trylock()) {
 603                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 604                 return;
 605         }
 606         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 607
 608         if (bond->igmp_retrans > 1) {
 609                 bond->igmp_retrans--;
 610                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 611         }
 612         rtnl_unlock();
 613 }
 614
 615 /* Flush bond's hardware addresses from slave
 616  */
 617 static void bond_hw_addr_flush(struct net_device *bond_dev,
 618                                struct net_device *slave_dev)
 619 {
 620         struct bonding *bond = netdev_priv(bond_dev);
 621
 622         dev_uc_unsync(slave_dev, bond_dev);
 623         dev_mc_unsync(slave_dev, bond_dev);
 624
 625         if (bond->params.mode == BOND_MODE_8023AD) {
 626                 /* del lacpdu mc addr from mc list */
 627                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 628
 629                 dev_mc_del(slave_dev, lacpdu_multicast);
 630         }
 631 }
 632
 633 /*--------------------------- Active slave change ---------------------------*/
 634
 635 /* Update the hardware address list and promisc/allmulti for the new and
 636  * old active slaves (if any).  Modes that are !USES_PRIMARY keep all
 637  * slaves up date at all times; only the USES_PRIMARY modes need to call
 638  * this function to swap these settings during a failover.
 639  */
 640 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 641                               struct slave *old_active)
 642 {
 643         ASSERT_RTNL();
 644
 645         if (old_active) {
 646                 if (bond->dev->flags & IFF_PROMISC)
 647                         dev_set_promiscuity(old_active->dev, -1);
 648
 649                 if (bond->dev->flags & IFF_ALLMULTI)
 650                         dev_set_allmulti(old_active->dev, -1);
 651
 652                 bond_hw_addr_flush(bond->dev, old_active->dev);
 653         }
 654
 655         if (new_active) {
 656                 /* FIXME: Signal errors upstream. */
 657                 if (bond->dev->flags & IFF_PROMISC)
 658                         dev_set_promiscuity(new_active->dev, 1);
 659
 660                 if (bond->dev->flags & IFF_ALLMULTI)
 661                         dev_set_allmulti(new_active->dev, 1);
 662
 663                 netif_addr_lock_bh(bond->dev);
 664                 dev_uc_sync(new_active->dev, bond->dev);
 665                 dev_mc_sync(new_active->dev, bond->dev);
 666                 netif_addr_unlock_bh(bond->dev);
 667         }
 668 }
 669
 670 /**
 671  * bond_set_dev_addr - clone slave's address to bond
 672  * @bond_dev: bond net device
 673  * @slave_dev: slave net device
 674  *
 675  * Should be called with RTNL held.
 676  */
 677 static void bond_set_dev_addr(struct net_device *bond_dev,
 678                               struct net_device *slave_dev)
 679 {
 680         pr_debug("bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 681                  bond_dev, slave_dev, slave_dev->addr_len);
 682         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 683         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 684         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 685 }
 686
 687 /*
 688  * bond_do_fail_over_mac
 689  *
 690  * Perform special MAC address swapping for fail_over_mac settings
 691  *
 692  * Called with RTNL, curr_slave_lock for write_bh.
 693  */
 694 static void bond_do_fail_over_mac(struct bonding *bond,
 695                                   struct slave *new_active,
 696                                   struct slave *old_active)
 697         __releases(&bond->curr_slave_lock)
 698         __acquires(&bond->curr_slave_lock)
 699 {
 700         u8 tmp_mac[ETH_ALEN];
 701         struct sockaddr saddr;
 702         int rv;
 703
 704         switch (bond->params.fail_over_mac) {
 705         case BOND_FOM_ACTIVE:
 706                 if (new_active) {
 707                         write_unlock_bh(&bond->curr_slave_lock);
 708                         bond_set_dev_addr(bond->dev, new_active->dev);
 709                         write_lock_bh(&bond->curr_slave_lock);
 710                 }
 711                 break;
 712         case BOND_FOM_FOLLOW:
 713                 /*
 714                  * if new_active && old_active, swap them
 715                  * if just old_active, do nothing (going to no active slave)
 716                  * if just new_active, set new_active to bond's MAC
 717                  */
 718                 if (!new_active)
 719                         return;
 720
 721                 write_unlock_bh(&bond->curr_slave_lock);
 722
 723                 if (old_active) {
 724                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
 725                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
 726                                ETH_ALEN);
 727                         saddr.sa_family = new_active->dev->type;
 728                 } else {
 729                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
 730                         saddr.sa_family = bond->dev->type;
 731                 }
 732
 733                 rv = dev_set_mac_address(new_active->dev, &saddr);
 734                 if (rv) {
 735                         pr_err("%s: Error %d setting MAC of slave %s\n",
 736                                bond->dev->name, -rv, new_active->dev->name);
 737                         goto out;
 738                 }
 739
 740                 if (!old_active)
 741                         goto out;
 742
 743                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
 744                 saddr.sa_family = old_active->dev->type;
 745
 746                 rv = dev_set_mac_address(old_active->dev, &saddr);
 747                 if (rv)
 748                         pr_err("%s: Error %d setting MAC of slave %s\n",
 749                                bond->dev->name, -rv, new_active->dev->name);
 750 out:
 751                 write_lock_bh(&bond->curr_slave_lock);
 752                 break;
 753         default:
 754                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
 755                        bond->dev->name, bond->params.fail_over_mac);
 756                 break;
 757         }
 758
 759 }
 760
 761 static bool bond_should_change_active(struct bonding *bond)
 762 {
 763         struct slave *prim = bond->primary_slave;
 764         struct slave *curr = bond->curr_active_slave;
 765
 766         if (!prim || !curr || curr->link != BOND_LINK_UP)
 767                 return true;
 768         if (bond->force_primary) {
 769                 bond->force_primary = false;
 770                 return true;
 771         }
 772         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
 773             (prim->speed < curr->speed ||
 774              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
 775                 return false;
 776         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
 777                 return false;
 778         return true;
 779 }
 780
 781 /**
 782  * find_best_interface - select the best available slave to be the active one
 783  * @bond: our bonding struct
 784  */
 785 static struct slave *bond_find_best_slave(struct bonding *bond)
 786 {
 787         struct slave *slave, *bestslave = NULL;
 788         struct list_head *iter;
 789         int mintime = bond->params.updelay;
 790
 791         if (bond->primary_slave && bond->primary_slave->link == BOND_LINK_UP &&
 792             bond_should_change_active(bond))
 793                 return bond->primary_slave;
 794
 795         bond_for_each_slave(bond, slave, iter) {
 796                 if (slave->link == BOND_LINK_UP)
 797                         return slave;
 798                 if (slave->link == BOND_LINK_BACK && IS_UP(slave->dev) &&
 799                     slave->delay < mintime) {
 800                         mintime = slave->delay;
 801                         bestslave = slave;
 802                 }
 803         }
 804
 805         return bestslave;
 806 }
 807
 808 static bool bond_should_notify_peers(struct bonding *bond)
 809 {
 810         struct slave *slave;
 811
 812         rcu_read_lock();
 813         slave = rcu_dereference(bond->curr_active_slave);
 814         rcu_read_unlock();
 815
 816         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
 817                  bond->dev->name, slave ? slave->dev->name : "NULL");
 818
 819         if (!slave || !bond->send_peer_notif ||
 820             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 821                 return false;
 822
 823         return true;
 824 }
 825
 826 /**
 827  * change_active_interface - change the active slave into the specified one
 828  * @bond: our bonding struct
 829  * @new: the new slave to make the active one
 830  *
 831  * Set the new slave to the bond's settings and unset them on the old
 832  * curr_active_slave.
 833  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 834  *
 835  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 836  * because it is apparently the best available slave we have, even though its
 837  * updelay hasn't timed out yet.
 838  *
 839  * If new_active is not NULL, caller must hold curr_slave_lock for write_bh.
 840  */
 841 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 842 {
 843         struct slave *old_active = bond->curr_active_slave;
 844
 845         if (old_active == new_active)
 846                 return;
 847
 848         if (new_active) {
 849                 new_active->jiffies = jiffies;
 850
 851                 if (new_active->link == BOND_LINK_BACK) {
 852                         if (USES_PRIMARY(bond->params.mode)) {
 853                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
 854                                         bond->dev->name, new_active->dev->name,
 855                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
 856                         }
 857
 858                         new_active->delay = 0;
 859                         new_active->link = BOND_LINK_UP;
 860
 861                         if (bond->params.mode == BOND_MODE_8023AD)
 862                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 863
 864                         if (bond_is_lb(bond))
 865                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 866                 } else {
 867                         if (USES_PRIMARY(bond->params.mode)) {
 868                                 pr_info("%s: making interface %s the new active one.\n",
 869                                         bond->dev->name, new_active->dev->name);
 870                         }
 871                 }
 872         }
 873
 874         if (USES_PRIMARY(bond->params.mode))
 875                 bond_hw_addr_swap(bond, new_active, old_active);
 876
 877         if (bond_is_lb(bond)) {
 878                 bond_alb_handle_active_change(bond, new_active);
 879                 if (old_active)
 880                         bond_set_slave_inactive_flags(old_active);
 881                 if (new_active)
 882                         bond_set_slave_active_flags(new_active);
 883         } else {
 884                 rcu_assign_pointer(bond->curr_active_slave, new_active);
 885         }
 886
 887         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
 888                 if (old_active)
 889                         bond_set_slave_inactive_flags(old_active);
 890
 891                 if (new_active) {
 892                         bool should_notify_peers = false;
 893
 894                         bond_set_slave_active_flags(new_active);
 895
 896                         if (bond->params.fail_over_mac)
 897                                 bond_do_fail_over_mac(bond, new_active,
 898                                                       old_active);
 899
 900                         if (netif_running(bond->dev)) {
 901                                 bond->send_peer_notif =
 902                                         bond->params.num_peer_notif;
 903                                 should_notify_peers =
 904                                         bond_should_notify_peers(bond);
 905                         }
 906
 907                         write_unlock_bh(&bond->curr_slave_lock);
 908
 909                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 910                         if (should_notify_peers)
 911                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 912                                                          bond->dev);
 913
 914                         write_lock_bh(&bond->curr_slave_lock);
 915                 }
 916         }
 917
 918         /* resend IGMP joins since active slave has changed or
 919          * all were sent on curr_active_slave.
 920          * resend only if bond is brought up with the affected
 921          * bonding modes and the retransmission is enabled */
 922         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 923             ((USES_PRIMARY(bond->params.mode) && new_active) ||
 924              bond->params.mode == BOND_MODE_ROUNDROBIN)) {
 925                 bond->igmp_retrans = bond->params.resend_igmp;
 926                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 927         }
 928 }
 929
 930 /**
 931  * bond_select_active_slave - select a new active slave, if needed
 932  * @bond: our bonding struct
 933  *
 934  * This functions should be called when one of the following occurs:
 935  * - The old curr_active_slave has been released or lost its link.
 936  * - The primary_slave has got its link back.
 937  * - A slave has got its link back and there's no old curr_active_slave.
 938  *
 939  * Caller must hold curr_slave_lock for write_bh.
 940  */
 941 void bond_select_active_slave(struct bonding *bond)
 942 {
 943         struct slave *best_slave;
 944         int rv;
 945
 946         best_slave = bond_find_best_slave(bond);
 947         if (best_slave != bond->curr_active_slave) {
 948                 bond_change_active_slave(bond, best_slave);
 949                 rv = bond_set_carrier(bond);
 950                 if (!rv)
 951                         return;
 952
 953                 if (netif_carrier_ok(bond->dev)) {
 954                         pr_info("%s: first active interface up!\n",
 955                                 bond->dev->name);
 956                 } else {
 957                         pr_info("%s: now running without any active interface !\n",
 958                                 bond->dev->name);
 959                 }
 960         }
 961 }
 962
 963 #ifdef CONFIG_NET_POLL_CONTROLLER
 964 static inline int slave_enable_netpoll(struct slave *slave)
 965 {
 966         struct netpoll *np;
 967         int err = 0;
 968
 969         np = kzalloc(sizeof(*np), GFP_ATOMIC);
 970         err = -ENOMEM;
 971         if (!np)
 972                 goto out;
 973
 974         err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
 975         if (err) {
 976                 kfree(np);
 977                 goto out;
 978         }
 979         slave->np = np;
 980 out:
 981         return err;
 982 }
 983 static inline void slave_disable_netpoll(struct slave *slave)
 984 {
 985         struct netpoll *np = slave->np;
 986
 987         if (!np)
 988                 return;
 989
 990         slave->np = NULL;
 991         __netpoll_free_async(np);
 992 }
 993 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
 994 {
 995         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
 996                 return false;
 997         if (!slave_dev->netdev_ops->ndo_poll_controller)
 998                 return false;
 999         return true;
1000 }
1001
1002 static void bond_poll_controller(struct net_device *bond_dev)
1003 {
1004 }
1005
1006 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1007 {
1008         struct bonding *bond = netdev_priv(bond_dev);
1009         struct list_head *iter;
1010         struct slave *slave;
1011
1012         bond_for_each_slave(bond, slave, iter)
1013                 if (IS_UP(slave->dev))
1014                         slave_disable_netpoll(slave);
1015 }
1016
1017 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
1018 {
1019         struct bonding *bond = netdev_priv(dev);
1020         struct list_head *iter;
1021         struct slave *slave;
1022         int err = 0;
1023
1024         bond_for_each_slave(bond, slave, iter) {
1025                 err = slave_enable_netpoll(slave);
1026                 if (err) {
1027                         bond_netpoll_cleanup(dev);
1028                         break;
1029                 }
1030         }
1031         return err;
1032 }
1033 #else
1034 static inline int slave_enable_netpoll(struct slave *slave)
1035 {
1036         return 0;
1037 }
1038 static inline void slave_disable_netpoll(struct slave *slave)
1039 {
1040 }
1041 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1042 {
1043 }
1044 #endif
1045
1046 /*---------------------------------- IOCTL ----------------------------------*/
1047
1048 static netdev_features_t bond_fix_features(struct net_device *dev,
1049                                            netdev_features_t features)
1050 {
1051         struct bonding *bond = netdev_priv(dev);
1052         struct list_head *iter;
1053         netdev_features_t mask;
1054         struct slave *slave;
1055
1056         if (!bond_has_slaves(bond)) {
1057                 /* Disable adding VLANs to empty bond. But why? --mq */
1058                 features |= NETIF_F_VLAN_CHALLENGED;
1059                 return features;
1060         }
1061
1062         mask = features;
1063         features &= ~NETIF_F_ONE_FOR_ALL;
1064         features |= NETIF_F_ALL_FOR_ALL;
1065
1066         bond_for_each_slave(bond, slave, iter) {
1067                 features = netdev_increment_features(features,
1068                                                      slave->dev->features,
1069                                                      mask);
1070         }
1071         features = netdev_add_tso_features(features, mask);
1072
1073         return features;
1074 }
1075
1076 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1077                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1078                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1079
1080 static void bond_compute_features(struct bonding *bond)
1081 {
1082         unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1083         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1084         struct net_device *bond_dev = bond->dev;
1085         struct list_head *iter;
1086         struct slave *slave;
1087         unsigned short max_hard_header_len = ETH_HLEN;
1088         unsigned int gso_max_size = GSO_MAX_SIZE;
1089         u16 gso_max_segs = GSO_MAX_SEGS;
1090
1091         if (!bond_has_slaves(bond))
1092                 goto done;
1093
1094         bond_for_each_slave(bond, slave, iter) {
1095                 vlan_features = netdev_increment_features(vlan_features,
1096                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1097
1098                 dst_release_flag &= slave->dev->priv_flags;
1099                 if (slave->dev->hard_header_len > max_hard_header_len)
1100                         max_hard_header_len = slave->dev->hard_header_len;
1101
1102                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1103                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1104         }
1105
1106 done:
1107         bond_dev->vlan_features = vlan_features;
1108         bond_dev->hard_header_len = max_hard_header_len;
1109         bond_dev->gso_max_segs = gso_max_segs;
1110         netif_set_gso_max_size(bond_dev, gso_max_size);
1111
1112         flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1113         bond_dev->priv_flags = flags | dst_release_flag;
1114
1115         netdev_change_features(bond_dev);
1116 }
1117
1118 static void bond_setup_by_slave(struct net_device *bond_dev,
1119                                 struct net_device *slave_dev)
1120 {
1121         bond_dev->header_ops        = slave_dev->header_ops;
1122
1123         bond_dev->type              = slave_dev->type;
1124         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1125         bond_dev->addr_len          = slave_dev->addr_len;
1126
1127         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1128                 slave_dev->addr_len);
1129 }
1130
1131 /* On bonding slaves other than the currently active slave, suppress
1132  * duplicates except for alb non-mcast/bcast.
1133  */
1134 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1135                                             struct slave *slave,
1136                                             struct bonding *bond)
1137 {
1138         if (bond_is_slave_inactive(slave)) {
1139                 if (bond->params.mode == BOND_MODE_ALB &&
1140                     skb->pkt_type != PACKET_BROADCAST &&
1141                     skb->pkt_type != PACKET_MULTICAST)
1142                         return false;
1143                 return true;
1144         }
1145         return false;
1146 }
1147
1148 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1149 {
1150         struct sk_buff *skb = *pskb;
1151         struct slave *slave;
1152         struct bonding *bond;
1153         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1154                           struct slave *);
1155         int ret = RX_HANDLER_ANOTHER;
1156
1157         skb = skb_share_check(skb, GFP_ATOMIC);
1158         if (unlikely(!skb))
1159                 return RX_HANDLER_CONSUMED;
1160
1161         *pskb = skb;
1162
1163         slave = bond_slave_get_rcu(skb->dev);
1164         bond = slave->bond;
1165
1166         if (bond->params.arp_interval)
1167                 slave->dev->last_rx = jiffies;
1168
1169         recv_probe = ACCESS_ONCE(bond->recv_probe);
1170         if (recv_probe) {
1171                 ret = recv_probe(skb, bond, slave);
1172                 if (ret == RX_HANDLER_CONSUMED) {
1173                         consume_skb(skb);
1174                         return ret;
1175                 }
1176         }
1177
1178         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1179                 return RX_HANDLER_EXACT;
1180         }
1181
1182         skb->dev = bond->dev;
1183
1184         if (bond->params.mode == BOND_MODE_ALB &&
1185             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1186             skb->pkt_type == PACKET_HOST) {
1187
1188                 if (unlikely(skb_cow_head(skb,
1189                                           skb->data - skb_mac_header(skb)))) {
1190                         kfree_skb(skb);
1191                         return RX_HANDLER_CONSUMED;
1192                 }
1193                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1194         }
1195
1196         return ret;
1197 }
1198
1199 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1200                                       struct net_device *slave_dev,
1201                                       struct slave *slave)
1202 {
1203         int err;
1204
1205         err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1206         if (err)
1207                 return err;
1208         slave_dev->flags |= IFF_SLAVE;
1209         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1210         return 0;
1211 }
1212
1213 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1214                                   struct net_device *slave_dev)
1215 {
1216         netdev_upper_dev_unlink(slave_dev, bond_dev);
1217         slave_dev->flags &= ~IFF_SLAVE;
1218         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1219 }
1220
1221 /* enslave device <slave> to bond device <master> */
1222 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1223 {
1224         struct bonding *bond = netdev_priv(bond_dev);
1225         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1226         struct slave *new_slave = NULL, *prev_slave;
1227         struct sockaddr addr;
1228         int link_reporting;
1229         int res = 0, i;
1230
1231         if (!bond->params.use_carrier &&
1232             slave_dev->ethtool_ops->get_link == NULL &&
1233             slave_ops->ndo_do_ioctl == NULL) {
1234                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1235                            bond_dev->name, slave_dev->name);
1236         }
1237
1238         /* already enslaved */
1239         if (slave_dev->flags & IFF_SLAVE) {
1240                 pr_debug("Error, Device was already enslaved\n");
1241                 return -EBUSY;
1242         }
1243
1244         /* vlan challenged mutual exclusion */
1245         /* no need to lock since we're protected by rtnl_lock */
1246         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1247                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1248                 if (vlan_uses_dev(bond_dev)) {
1249                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1250                                bond_dev->name, slave_dev->name, bond_dev->name);
1251                         return -EPERM;
1252                 } else {
1253                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1254                                    bond_dev->name, slave_dev->name,
1255                                    slave_dev->name, bond_dev->name);
1256                 }
1257         } else {
1258                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1259         }
1260
1261         /*
1262          * Old ifenslave binaries are no longer supported.  These can
1263          * be identified with moderate accuracy by the state of the slave:
1264          * the current ifenslave will set the interface down prior to
1265          * enslaving it; the old ifenslave will not.
1266          */
1267         if ((slave_dev->flags & IFF_UP)) {
1268                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1269                        slave_dev->name);
1270                 res = -EPERM;
1271                 goto err_undo_flags;
1272         }
1273
1274         /* set bonding device ether type by slave - bonding netdevices are
1275          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1276          * there is a need to override some of the type dependent attribs/funcs.
1277          *
1278          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1279          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1280          */
1281         if (!bond_has_slaves(bond)) {
1282                 if (bond_dev->type != slave_dev->type) {
1283                         pr_debug("%s: change device type from %d to %d\n",
1284                                  bond_dev->name,
1285                                  bond_dev->type, slave_dev->type);
1286
1287                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1288                                                        bond_dev);
1289                         res = notifier_to_errno(res);
1290                         if (res) {
1291                                 pr_err("%s: refused to change device type\n",
1292                                        bond_dev->name);
1293                                 res = -EBUSY;
1294                                 goto err_undo_flags;
1295                         }
1296
1297                         /* Flush unicast and multicast addresses */
1298                         dev_uc_flush(bond_dev);
1299                         dev_mc_flush(bond_dev);
1300
1301                         if (slave_dev->type != ARPHRD_ETHER)
1302                                 bond_setup_by_slave(bond_dev, slave_dev);
1303                         else {
1304                                 ether_setup(bond_dev);
1305                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1306                         }
1307
1308                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1309                                                  bond_dev);
1310                 }
1311         } else if (bond_dev->type != slave_dev->type) {
1312                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1313                        slave_dev->name,
1314                        slave_dev->type, bond_dev->type);
1315                 res = -EINVAL;
1316                 goto err_undo_flags;
1317         }
1318
1319         if (slave_ops->ndo_set_mac_address == NULL) {
1320                 if (!bond_has_slaves(bond)) {
1321                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1322                                    bond_dev->name);
1323                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1324                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1325                         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",
1326                                bond_dev->name);
1327                         res = -EOPNOTSUPP;
1328                         goto err_undo_flags;
1329                 }
1330         }
1331
1332         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1333
1334         /* If this is the first slave, then we need to set the master's hardware
1335          * address to be the same as the slave's. */
1336         if (!bond_has_slaves(bond) &&
1337             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1338                 bond_set_dev_addr(bond->dev, slave_dev);
1339
1340         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1341         if (!new_slave) {
1342                 res = -ENOMEM;
1343                 goto err_undo_flags;
1344         }
1345         /*
1346          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1347          * is set via sysfs or module option if desired.
1348          */
1349         new_slave->queue_id = 0;
1350
1351         /* Save slave's original mtu and then set it to match the bond */
1352         new_slave->original_mtu = slave_dev->mtu;
1353         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1354         if (res) {
1355                 pr_debug("Error %d calling dev_set_mtu\n", res);
1356                 goto err_free;
1357         }
1358
1359         /*
1360          * Save slave's original ("permanent") mac address for modes
1361          * that need it, and for restoring it upon release, and then
1362          * set it to the master's address
1363          */
1364         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1365
1366         if (!bond->params.fail_over_mac) {
1367                 /*
1368                  * Set slave to master's mac address.  The application already
1369                  * set the master's mac address to that of the first slave
1370                  */
1371                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1372                 addr.sa_family = slave_dev->type;
1373                 res = dev_set_mac_address(slave_dev, &addr);
1374                 if (res) {
1375                         pr_debug("Error %d calling set_mac_address\n", res);
1376                         goto err_restore_mtu;
1377                 }
1378         }
1379
1380         /* open the slave since the application closed it */
1381         res = dev_open(slave_dev);
1382         if (res) {
1383                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1384                 goto err_restore_mac;
1385         }
1386
1387         new_slave->bond = bond;
1388         new_slave->dev = slave_dev;
1389         slave_dev->priv_flags |= IFF_BONDING;
1390
1391         if (bond_is_lb(bond)) {
1392                 /* bond_alb_init_slave() must be called before all other stages since
1393                  * it might fail and we do not want to have to undo everything
1394                  */
1395                 res = bond_alb_init_slave(bond, new_slave);
1396                 if (res)
1397                         goto err_close;
1398         }
1399
1400         /* If the mode USES_PRIMARY, then the following is handled by
1401          * bond_change_active_slave().
1402          */
1403         if (!USES_PRIMARY(bond->params.mode)) {
1404                 /* set promiscuity level to new slave */
1405                 if (bond_dev->flags & IFF_PROMISC) {
1406                         res = dev_set_promiscuity(slave_dev, 1);
1407                         if (res)
1408                                 goto err_close;
1409                 }
1410
1411                 /* set allmulti level to new slave */
1412                 if (bond_dev->flags & IFF_ALLMULTI) {
1413                         res = dev_set_allmulti(slave_dev, 1);
1414                         if (res)
1415                                 goto err_close;
1416                 }
1417
1418                 netif_addr_lock_bh(bond_dev);
1419
1420                 dev_mc_sync_multiple(slave_dev, bond_dev);
1421                 dev_uc_sync_multiple(slave_dev, bond_dev);
1422
1423                 netif_addr_unlock_bh(bond_dev);
1424         }
1425
1426         if (bond->params.mode == BOND_MODE_8023AD) {
1427                 /* add lacpdu mc addr to mc list */
1428                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1429
1430                 dev_mc_add(slave_dev, lacpdu_multicast);
1431         }
1432
1433         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1434         if (res) {
1435                 pr_err("%s: Error: Couldn't add bond vlan ids to %s\n",
1436                        bond_dev->name, slave_dev->name);
1437                 goto err_close;
1438         }
1439
1440         prev_slave = bond_last_slave(bond);
1441
1442         new_slave->delay = 0;
1443         new_slave->link_failure_count = 0;
1444
1445         bond_update_speed_duplex(new_slave);
1446
1447         new_slave->last_arp_rx = jiffies -
1448                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1449         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1450                 new_slave->target_last_arp_rx[i] = new_slave->last_arp_rx;
1451
1452         if (bond->params.miimon && !bond->params.use_carrier) {
1453                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1454
1455                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1456                         /*
1457                          * miimon is set but a bonded network driver
1458                          * does not support ETHTOOL/MII and
1459                          * arp_interval is not set.  Note: if
1460                          * use_carrier is enabled, we will never go
1461                          * here (because netif_carrier is always
1462                          * supported); thus, we don't need to change
1463                          * the messages for netif_carrier.
1464                          */
1465                         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",
1466                                bond_dev->name, slave_dev->name);
1467                 } else if (link_reporting == -1) {
1468                         /* unable get link status using mii/ethtool */
1469                         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",
1470                                    bond_dev->name, slave_dev->name);
1471                 }
1472         }
1473
1474         /* check for initial state */
1475         if (bond->params.miimon) {
1476                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1477                         if (bond->params.updelay) {
1478                                 new_slave->link = BOND_LINK_BACK;
1479                                 new_slave->delay = bond->params.updelay;
1480                         } else {
1481                                 new_slave->link = BOND_LINK_UP;
1482                         }
1483                 } else {
1484                         new_slave->link = BOND_LINK_DOWN;
1485                 }
1486         } else if (bond->params.arp_interval) {
1487                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1488                         BOND_LINK_UP : BOND_LINK_DOWN);
1489         } else {
1490                 new_slave->link = BOND_LINK_UP;
1491         }
1492
1493         if (new_slave->link != BOND_LINK_DOWN)
1494                 new_slave->jiffies = jiffies;
1495         pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1496                 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1497                         (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1498
1499         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1500                 /* if there is a primary slave, remember it */
1501                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1502                         bond->primary_slave = new_slave;
1503                         bond->force_primary = true;
1504                 }
1505         }
1506
1507         switch (bond->params.mode) {
1508         case BOND_MODE_ACTIVEBACKUP:
1509                 bond_set_slave_inactive_flags(new_slave);
1510                 break;
1511         case BOND_MODE_8023AD:
1512                 /* in 802.3ad mode, the internal mechanism
1513                  * will activate the slaves in the selected
1514                  * aggregator
1515                  */
1516                 bond_set_slave_inactive_flags(new_slave);
1517                 /* if this is the first slave */
1518                 if (!prev_slave) {
1519                         SLAVE_AD_INFO(new_slave).id = 1;
1520                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1521                          * can be called only after the mac address of the bond is set
1522                          */
1523                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1524                 } else {
1525                         SLAVE_AD_INFO(new_slave).id =
1526                                 SLAVE_AD_INFO(prev_slave).id + 1;
1527                 }
1528
1529                 bond_3ad_bind_slave(new_slave);
1530                 break;
1531         case BOND_MODE_TLB:
1532         case BOND_MODE_ALB:
1533                 bond_set_active_slave(new_slave);
1534                 bond_set_slave_inactive_flags(new_slave);
1535                 break;
1536         default:
1537                 pr_debug("This slave is always active in trunk mode\n");
1538
1539                 /* always active in trunk mode */
1540                 bond_set_active_slave(new_slave);
1541
1542                 /* In trunking mode there is little meaning to curr_active_slave
1543                  * anyway (it holds no special properties of the bond device),
1544                  * so we can change it without calling change_active_interface()
1545                  */
1546                 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1547                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1548
1549                 break;
1550         } /* switch(bond_mode) */
1551
1552 #ifdef CONFIG_NET_POLL_CONTROLLER
1553         slave_dev->npinfo = bond->dev->npinfo;
1554         if (slave_dev->npinfo) {
1555                 if (slave_enable_netpoll(new_slave)) {
1556                         read_unlock(&bond->lock);
1557                         pr_info("Error, %s: master_dev is using netpoll, "
1558                                  "but new slave device does not support netpoll.\n",
1559                                  bond_dev->name);
1560                         res = -EBUSY;
1561                         goto err_detach;
1562                 }
1563         }
1564 #endif
1565
1566         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1567                                          new_slave);
1568         if (res) {
1569                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1570                 goto err_detach;
1571         }
1572
1573         res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1574         if (res) {
1575                 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1576                 goto err_unregister;
1577         }
1578
1579         bond->slave_cnt++;
1580         bond_compute_features(bond);
1581         bond_set_carrier(bond);
1582
1583         if (USES_PRIMARY(bond->params.mode)) {
1584                 write_lock_bh(&bond->curr_slave_lock);
1585                 bond_select_active_slave(bond);
1586                 write_unlock_bh(&bond->curr_slave_lock);
1587         }
1588
1589         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1590                 bond_dev->name, slave_dev->name,
1591                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1592                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1593
1594         /* enslave is successful */
1595         return 0;
1596
1597 /* Undo stages on error */
1598 err_unregister:
1599         netdev_rx_handler_unregister(slave_dev);
1600
1601 err_detach:
1602         if (!USES_PRIMARY(bond->params.mode))
1603                 bond_hw_addr_flush(bond_dev, slave_dev);
1604
1605         vlan_vids_del_by_dev(slave_dev, bond_dev);
1606         if (bond->primary_slave == new_slave)
1607                 bond->primary_slave = NULL;
1608         if (bond->curr_active_slave == new_slave) {
1609                 write_lock_bh(&bond->curr_slave_lock);
1610                 bond_change_active_slave(bond, NULL);
1611                 bond_select_active_slave(bond);
1612                 write_unlock_bh(&bond->curr_slave_lock);
1613         }
1614         slave_disable_netpoll(new_slave);
1615
1616 err_close:
1617         slave_dev->priv_flags &= ~IFF_BONDING;
1618         dev_close(slave_dev);
1619
1620 err_restore_mac:
1621         if (!bond->params.fail_over_mac) {
1622                 /* XXX TODO - fom follow mode needs to change master's
1623                  * MAC if this slave's MAC is in use by the bond, or at
1624                  * least print a warning.
1625                  */
1626                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1627                 addr.sa_family = slave_dev->type;
1628                 dev_set_mac_address(slave_dev, &addr);
1629         }
1630
1631 err_restore_mtu:
1632         dev_set_mtu(slave_dev, new_slave->original_mtu);
1633
1634 err_free:
1635         kfree(new_slave);
1636
1637 err_undo_flags:
1638         /* Enslave of first slave has failed and we need to fix master's mac */
1639         if (!bond_has_slaves(bond) &&
1640             ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
1641                 eth_hw_addr_random(bond_dev);
1642
1643         return res;
1644 }
1645
1646 /*
1647  * Try to release the slave device <slave> from the bond device <master>
1648  * It is legal to access curr_active_slave without a lock because all the function
1649  * is write-locked. If "all" is true it means that the function is being called
1650  * while destroying a bond interface and all slaves are being released.
1651  *
1652  * The rules for slave state should be:
1653  *   for Active/Backup:
1654  *     Active stays on all backups go down
1655  *   for Bonded connections:
1656  *     The first up interface should be left on and all others downed.
1657  */
1658 static int __bond_release_one(struct net_device *bond_dev,
1659                               struct net_device *slave_dev,
1660                               bool all)
1661 {
1662         struct bonding *bond = netdev_priv(bond_dev);
1663         struct slave *slave, *oldcurrent;
1664         struct sockaddr addr;
1665         int old_flags = bond_dev->flags;
1666         netdev_features_t old_features = bond_dev->features;
1667
1668         /* slave is not a slave or master is not master of this slave */
1669         if (!(slave_dev->flags & IFF_SLAVE) ||
1670             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1671                 pr_err("%s: Error: cannot release %s.\n",
1672                        bond_dev->name, slave_dev->name);
1673                 return -EINVAL;
1674         }
1675
1676         block_netpoll_tx();
1677
1678         slave = bond_get_slave_by_dev(bond, slave_dev);
1679         if (!slave) {
1680                 /* not a slave of this bond */
1681                 pr_info("%s: %s not enslaved\n",
1682                         bond_dev->name, slave_dev->name);
1683                 unblock_netpoll_tx();
1684                 return -EINVAL;
1685         }
1686
1687         /* release the slave from its bond */
1688         bond->slave_cnt--;
1689
1690         bond_upper_dev_unlink(bond_dev, slave_dev);
1691         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1692          * for this slave anymore.
1693          */
1694         netdev_rx_handler_unregister(slave_dev);
1695         write_lock_bh(&bond->lock);
1696
1697         /* Inform AD package of unbinding of slave. */
1698         if (bond->params.mode == BOND_MODE_8023AD)
1699                 bond_3ad_unbind_slave(slave);
1700
1701         write_unlock_bh(&bond->lock);
1702
1703         pr_info("%s: releasing %s interface %s\n",
1704                 bond_dev->name,
1705                 bond_is_active_slave(slave) ? "active" : "backup",
1706                 slave_dev->name);
1707
1708         oldcurrent = bond->curr_active_slave;
1709
1710         bond->current_arp_slave = NULL;
1711
1712         if (!all && !bond->params.fail_over_mac) {
1713                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1714                     bond_has_slaves(bond))
1715                         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",
1716                                    bond_dev->name, slave_dev->name,
1717                                    slave->perm_hwaddr,
1718                                    bond_dev->name, slave_dev->name);
1719         }
1720
1721         if (bond->primary_slave == slave)
1722                 bond->primary_slave = NULL;
1723
1724         if (oldcurrent == slave) {
1725                 write_lock_bh(&bond->curr_slave_lock);
1726                 bond_change_active_slave(bond, NULL);
1727                 write_unlock_bh(&bond->curr_slave_lock);
1728         }
1729
1730         if (bond_is_lb(bond)) {
1731                 /* Must be called only after the slave has been
1732                  * detached from the list and the curr_active_slave
1733                  * has been cleared (if our_slave == old_current),
1734                  * but before a new active slave is selected.
1735                  */
1736                 bond_alb_deinit_slave(bond, slave);
1737         }
1738
1739         if (all) {
1740                 rcu_assign_pointer(bond->curr_active_slave, NULL);
1741         } else if (oldcurrent == slave) {
1742                 /*
1743                  * Note that we hold RTNL over this sequence, so there
1744                  * is no concern that another slave add/remove event
1745                  * will interfere.
1746                  */
1747                 write_lock_bh(&bond->curr_slave_lock);
1748
1749                 bond_select_active_slave(bond);
1750
1751                 write_unlock_bh(&bond->curr_slave_lock);
1752         }
1753
1754         if (!bond_has_slaves(bond)) {
1755                 bond_set_carrier(bond);
1756                 eth_hw_addr_random(bond_dev);
1757
1758                 if (vlan_uses_dev(bond_dev)) {
1759                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1760                                    bond_dev->name, bond_dev->name);
1761                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1762                                    bond_dev->name);
1763                 }
1764         }
1765
1766         unblock_netpoll_tx();
1767         synchronize_rcu();
1768
1769         if (!bond_has_slaves(bond)) {
1770                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1771                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1772         }
1773
1774         bond_compute_features(bond);
1775         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1776             (old_features & NETIF_F_VLAN_CHALLENGED))
1777                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1778                         bond_dev->name, slave_dev->name, bond_dev->name);
1779
1780         /* must do this from outside any spinlocks */
1781         vlan_vids_del_by_dev(slave_dev, bond_dev);
1782
1783         /* If the mode USES_PRIMARY, then this cases was handled above by
1784          * bond_change_active_slave(..., NULL)
1785          */
1786         if (!USES_PRIMARY(bond->params.mode)) {
1787                 /* unset promiscuity level from slave
1788                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1789                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1790                  * value of that flag before that change, as that was the value
1791                  * when this slave was attached, so we cache at the start of the
1792                  * function and use it here. Same goes for ALLMULTI below
1793                  */
1794                 if (old_flags & IFF_PROMISC)
1795                         dev_set_promiscuity(slave_dev, -1);
1796
1797                 /* unset allmulti level from slave */
1798                 if (old_flags & IFF_ALLMULTI)
1799                         dev_set_allmulti(slave_dev, -1);
1800
1801                 bond_hw_addr_flush(bond_dev, slave_dev);
1802         }
1803
1804         slave_disable_netpoll(slave);
1805
1806         /* close slave before restoring its mac address */
1807         dev_close(slave_dev);
1808
1809         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1810                 /* restore original ("permanent") mac address */
1811                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1812                 addr.sa_family = slave_dev->type;
1813                 dev_set_mac_address(slave_dev, &addr);
1814         }
1815
1816         dev_set_mtu(slave_dev, slave->original_mtu);
1817
1818         slave_dev->priv_flags &= ~IFF_BONDING;
1819
1820         kfree(slave);
1821
1822         return 0;  /* deletion OK */
1823 }
1824
1825 /* A wrapper used because of ndo_del_link */
1826 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1827 {
1828         return __bond_release_one(bond_dev, slave_dev, false);
1829 }
1830
1831 /*
1832 * First release a slave and then destroy the bond if no more slaves are left.
1833 * Must be under rtnl_lock when this function is called.
1834 */
1835 static int  bond_release_and_destroy(struct net_device *bond_dev,
1836                                      struct net_device *slave_dev)
1837 {
1838         struct bonding *bond = netdev_priv(bond_dev);
1839         int ret;
1840
1841         ret = bond_release(bond_dev, slave_dev);
1842         if (ret == 0 && !bond_has_slaves(bond)) {
1843                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1844                 pr_info("%s: destroying bond %s.\n",
1845                         bond_dev->name, bond_dev->name);
1846                 unregister_netdevice(bond_dev);
1847         }
1848         return ret;
1849 }
1850
1851 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1852 {
1853         struct bonding *bond = netdev_priv(bond_dev);
1854
1855         info->bond_mode = bond->params.mode;
1856         info->miimon = bond->params.miimon;
1857
1858         read_lock(&bond->lock);
1859         info->num_slaves = bond->slave_cnt;
1860         read_unlock(&bond->lock);
1861
1862         return 0;
1863 }
1864
1865 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1866 {
1867         struct bonding *bond = netdev_priv(bond_dev);
1868         struct list_head *iter;
1869         int i = 0, res = -ENODEV;
1870         struct slave *slave;
1871
1872         read_lock(&bond->lock);
1873         bond_for_each_slave(bond, slave, iter) {
1874                 if (i++ == (int)info->slave_id) {
1875                         res = 0;
1876                         strcpy(info->slave_name, slave->dev->name);
1877                         info->link = slave->link;
1878                         info->state = bond_slave_state(slave);
1879                         info->link_failure_count = slave->link_failure_count;
1880                         break;
1881                 }
1882         }
1883         read_unlock(&bond->lock);
1884
1885         return res;
1886 }
1887
1888 /*-------------------------------- Monitoring -------------------------------*/
1889
1890
1891 static int bond_miimon_inspect(struct bonding *bond)
1892 {
1893         int link_state, commit = 0;
1894         struct list_head *iter;
1895         struct slave *slave;
1896         bool ignore_updelay;
1897
1898         ignore_updelay = !bond->curr_active_slave ? true : false;
1899
1900         bond_for_each_slave_rcu(bond, slave, iter) {
1901                 slave->new_link = BOND_LINK_NOCHANGE;
1902
1903                 link_state = bond_check_dev_link(bond, slave->dev, 0);
1904
1905                 switch (slave->link) {
1906                 case BOND_LINK_UP:
1907                         if (link_state)
1908                                 continue;
1909
1910                         slave->link = BOND_LINK_FAIL;
1911                         slave->delay = bond->params.downdelay;
1912                         if (slave->delay) {
1913                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
1914                                         bond->dev->name,
1915                                         (bond->params.mode ==
1916                                          BOND_MODE_ACTIVEBACKUP) ?
1917                                         (bond_is_active_slave(slave) ?
1918                                          "active " : "backup ") : "",
1919                                         slave->dev->name,
1920                                         bond->params.downdelay * bond->params.miimon);
1921                         }
1922                         /*FALLTHRU*/
1923                 case BOND_LINK_FAIL:
1924                         if (link_state) {
1925                                 /*
1926                                  * recovered before downdelay expired
1927                                  */
1928                                 slave->link = BOND_LINK_UP;
1929                                 slave->jiffies = jiffies;
1930                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
1931                                         bond->dev->name,
1932                                         (bond->params.downdelay - slave->delay) *
1933                                         bond->params.miimon,
1934                                         slave->dev->name);
1935                                 continue;
1936                         }
1937
1938                         if (slave->delay <= 0) {
1939                                 slave->new_link = BOND_LINK_DOWN;
1940                                 commit++;
1941                                 continue;
1942                         }
1943
1944                         slave->delay--;
1945                         break;
1946
1947                 case BOND_LINK_DOWN:
1948                         if (!link_state)
1949                                 continue;
1950
1951                         slave->link = BOND_LINK_BACK;
1952                         slave->delay = bond->params.updelay;
1953
1954                         if (slave->delay) {
1955                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
1956                                         bond->dev->name, slave->dev->name,
1957                                         ignore_updelay ? 0 :
1958                                         bond->params.updelay *
1959                                         bond->params.miimon);
1960                         }
1961                         /*FALLTHRU*/
1962                 case BOND_LINK_BACK:
1963                         if (!link_state) {
1964                                 slave->link = BOND_LINK_DOWN;
1965                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
1966                                         bond->dev->name,
1967                                         (bond->params.updelay - slave->delay) *
1968                                         bond->params.miimon,
1969                                         slave->dev->name);
1970
1971                                 continue;
1972                         }
1973
1974                         if (ignore_updelay)
1975                                 slave->delay = 0;
1976
1977                         if (slave->delay <= 0) {
1978                                 slave->new_link = BOND_LINK_UP;
1979                                 commit++;
1980                                 ignore_updelay = false;
1981                                 continue;
1982                         }
1983
1984                         slave->delay--;
1985                         break;
1986                 }
1987         }
1988
1989         return commit;
1990 }
1991
1992 static void bond_miimon_commit(struct bonding *bond)
1993 {
1994         struct list_head *iter;
1995         struct slave *slave;
1996
1997         bond_for_each_slave(bond, slave, iter) {
1998                 switch (slave->new_link) {
1999                 case BOND_LINK_NOCHANGE:
2000                         continue;
2001
2002                 case BOND_LINK_UP:
2003                         slave->link = BOND_LINK_UP;
2004                         slave->jiffies = jiffies;
2005
2006                         if (bond->params.mode == BOND_MODE_8023AD) {
2007                                 /* prevent it from being the active one */
2008                                 bond_set_backup_slave(slave);
2009                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2010                                 /* make it immediately active */
2011                                 bond_set_active_slave(slave);
2012                         } else if (slave != bond->primary_slave) {
2013                                 /* prevent it from being the active one */
2014                                 bond_set_backup_slave(slave);
2015                         }
2016
2017                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2018                                 bond->dev->name, slave->dev->name,
2019                                 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2020                                 slave->duplex ? "full" : "half");
2021
2022                         /* notify ad that the link status has changed */
2023                         if (bond->params.mode == BOND_MODE_8023AD)
2024                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2025
2026                         if (bond_is_lb(bond))
2027                                 bond_alb_handle_link_change(bond, slave,
2028                                                             BOND_LINK_UP);
2029
2030                         if (!bond->curr_active_slave ||
2031                             (slave == bond->primary_slave))
2032                                 goto do_failover;
2033
2034                         continue;
2035
2036                 case BOND_LINK_DOWN:
2037                         if (slave->link_failure_count < UINT_MAX)
2038                                 slave->link_failure_count++;
2039
2040                         slave->link = BOND_LINK_DOWN;
2041
2042                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2043                             bond->params.mode == BOND_MODE_8023AD)
2044                                 bond_set_slave_inactive_flags(slave);
2045
2046                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2047                                 bond->dev->name, slave->dev->name);
2048
2049                         if (bond->params.mode == BOND_MODE_8023AD)
2050                                 bond_3ad_handle_link_change(slave,
2051                                                             BOND_LINK_DOWN);
2052
2053                         if (bond_is_lb(bond))
2054                                 bond_alb_handle_link_change(bond, slave,
2055                                                             BOND_LINK_DOWN);
2056
2057                         if (slave == bond->curr_active_slave)
2058                                 goto do_failover;
2059
2060                         continue;
2061
2062                 default:
2063                         pr_err("%s: invalid new link %d on slave %s\n",
2064                                bond->dev->name, slave->new_link,
2065                                slave->dev->name);
2066                         slave->new_link = BOND_LINK_NOCHANGE;
2067
2068                         continue;
2069                 }
2070
2071 do_failover:
2072                 ASSERT_RTNL();
2073                 block_netpoll_tx();
2074                 write_lock_bh(&bond->curr_slave_lock);
2075                 bond_select_active_slave(bond);
2076                 write_unlock_bh(&bond->curr_slave_lock);
2077                 unblock_netpoll_tx();
2078         }
2079
2080         bond_set_carrier(bond);
2081 }
2082
2083 /*
2084  * bond_mii_monitor
2085  *
2086  * Really a wrapper that splits the mii monitor into two phases: an
2087  * inspection, then (if inspection indicates something needs to be done)
2088  * an acquisition of appropriate locks followed by a commit phase to
2089  * implement whatever link state changes are indicated.
2090  */
2091 static void bond_mii_monitor(struct work_struct *work)
2092 {
2093         struct bonding *bond = container_of(work, struct bonding,
2094                                             mii_work.work);
2095         bool should_notify_peers = false;
2096         unsigned long delay;
2097
2098         delay = msecs_to_jiffies(bond->params.miimon);
2099
2100         if (!bond_has_slaves(bond))
2101                 goto re_arm;
2102
2103         rcu_read_lock();
2104
2105         should_notify_peers = bond_should_notify_peers(bond);
2106
2107         if (bond_miimon_inspect(bond)) {
2108                 rcu_read_unlock();
2109
2110                 /* Race avoidance with bond_close cancel of workqueue */
2111                 if (!rtnl_trylock()) {
2112                         delay = 1;
2113                         should_notify_peers = false;
2114                         goto re_arm;
2115                 }
2116
2117                 bond_miimon_commit(bond);
2118
2119                 rtnl_unlock();  /* might sleep, hold no other locks */
2120         } else
2121                 rcu_read_unlock();
2122
2123 re_arm:
2124         if (bond->params.miimon)
2125                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2126
2127         if (should_notify_peers) {
2128                 if (!rtnl_trylock())
2129                         return;
2130                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2131                 rtnl_unlock();
2132         }
2133 }
2134
2135 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2136 {
2137         struct net_device *upper;
2138         struct list_head *iter;
2139         bool ret = false;
2140
2141         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2142                 return true;
2143
2144         rcu_read_lock();
2145         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2146                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2147                         ret = true;
2148                         break;
2149                 }
2150         }
2151         rcu_read_unlock();
2152
2153         return ret;
2154 }
2155
2156 /*
2157  * We go to the (large) trouble of VLAN tagging ARP frames because
2158  * switches in VLAN mode (especially if ports are configured as
2159  * "native" to a VLAN) might not pass non-tagged frames.
2160  */
2161 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2162 {
2163         struct sk_buff *skb;
2164
2165         pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op,
2166                  slave_dev->name, &dest_ip, &src_ip, vlan_id);
2167
2168         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2169                          NULL, slave_dev->dev_addr, NULL);
2170
2171         if (!skb) {
2172                 pr_err("ARP packet allocation failed\n");
2173                 return;
2174         }
2175         if (vlan_id) {
2176                 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2177                 if (!skb) {
2178                         pr_err("failed to insert VLAN tag\n");
2179                         return;
2180                 }
2181         }
2182         arp_xmit(skb);
2183 }
2184
2185
2186 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2187 {
2188         struct net_device *upper, *vlan_upper;
2189         struct list_head *iter, *vlan_iter;
2190         struct rtable *rt;
2191         __be32 *targets = bond->params.arp_targets, addr;
2192         int i, vlan_id;
2193
2194         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2195                 pr_debug("basa: target %pI4\n", &targets[i]);
2196
2197                 /* Find out through which dev should the packet go */
2198                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2199                                      RTO_ONLINK, 0);
2200                 if (IS_ERR(rt)) {
2201                         pr_debug("%s: no route to arp_ip_target %pI4\n",
2202                                  bond->dev->name, &targets[i]);
2203                         continue;
2204                 }
2205
2206                 vlan_id = 0;
2207
2208                 /* bond device itself */
2209                 if (rt->dst.dev == bond->dev)
2210                         goto found;
2211
2212                 rcu_read_lock();
2213                 /* first we search only for vlan devices. for every vlan
2214                  * found we verify its upper dev list, searching for the
2215                  * rt->dst.dev. If found we save the tag of the vlan and
2216                  * proceed to send the packet.
2217                  *
2218                  * TODO: QinQ?
2219                  */
2220                 netdev_for_each_all_upper_dev_rcu(bond->dev, vlan_upper,
2221                                                   vlan_iter) {
2222                         if (!is_vlan_dev(vlan_upper))
2223                                 continue;
2224                         netdev_for_each_all_upper_dev_rcu(vlan_upper, upper,
2225                                                           iter) {
2226                                 if (upper == rt->dst.dev) {
2227                                         vlan_id = vlan_dev_vlan_id(vlan_upper);
2228                                         rcu_read_unlock();
2229                                         goto found;
2230                                 }
2231                         }
2232                 }
2233
2234                 /* if the device we're looking for is not on top of any of
2235                  * our upper vlans, then just search for any dev that
2236                  * matches, and in case it's a vlan - save the id
2237                  */
2238                 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2239                         if (upper == rt->dst.dev) {
2240                                 /* if it's a vlan - get its VID */
2241                                 if (is_vlan_dev(upper))
2242                                         vlan_id = vlan_dev_vlan_id(upper);
2243
2244                                 rcu_read_unlock();
2245                                 goto found;
2246                         }
2247                 }
2248                 rcu_read_unlock();
2249
2250                 /* Not our device - skip */
2251                 pr_debug("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2252                          bond->dev->name, &targets[i],
2253                          rt->dst.dev ? rt->dst.dev->name : "NULL");
2254
2255                 ip_rt_put(rt);
2256                 continue;
2257
2258 found:
2259                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2260                 ip_rt_put(rt);
2261                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2262                               addr, vlan_id);
2263         }
2264 }
2265
2266 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2267 {
2268         int i;
2269
2270         if (!sip || !bond_has_this_ip(bond, tip)) {
2271                 pr_debug("bva: sip %pI4 tip %pI4 not found\n", &sip, &tip);
2272                 return;
2273         }
2274
2275         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2276         if (i == -1) {
2277                 pr_debug("bva: sip %pI4 not found in targets\n", &sip);
2278                 return;
2279         }
2280         slave->last_arp_rx = jiffies;
2281         slave->target_last_arp_rx[i] = jiffies;
2282 }
2283
2284 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2285                  struct slave *slave)
2286 {
2287         struct arphdr *arp = (struct arphdr *)skb->data;
2288         unsigned char *arp_ptr;
2289         __be32 sip, tip;
2290         int alen;
2291
2292         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2293                 return RX_HANDLER_ANOTHER;
2294
2295         read_lock(&bond->lock);
2296
2297         if (!slave_do_arp_validate(bond, slave))
2298                 goto out_unlock;
2299
2300         alen = arp_hdr_len(bond->dev);
2301
2302         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2303                  bond->dev->name, skb->dev->name);
2304
2305         if (alen > skb_headlen(skb)) {
2306                 arp = kmalloc(alen, GFP_ATOMIC);
2307                 if (!arp)
2308                         goto out_unlock;
2309                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2310                         goto out_unlock;
2311         }
2312
2313         if (arp->ar_hln != bond->dev->addr_len ||
2314             skb->pkt_type == PACKET_OTHERHOST ||
2315             skb->pkt_type == PACKET_LOOPBACK ||
2316             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2317             arp->ar_pro != htons(ETH_P_IP) ||
2318             arp->ar_pln != 4)
2319                 goto out_unlock;
2320
2321         arp_ptr = (unsigned char *)(arp + 1);
2322         arp_ptr += bond->dev->addr_len;
2323         memcpy(&sip, arp_ptr, 4);
2324         arp_ptr += 4 + bond->dev->addr_len;
2325         memcpy(&tip, arp_ptr, 4);
2326
2327         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2328                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2329                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2330                  &sip, &tip);
2331
2332         /*
2333          * Backup slaves won't see the ARP reply, but do come through
2334          * here for each ARP probe (so we swap the sip/tip to validate
2335          * the probe).  In a "redundant switch, common router" type of
2336          * configuration, the ARP probe will (hopefully) travel from
2337          * the active, through one switch, the router, then the other
2338          * switch before reaching the backup.
2339          *
2340          * We 'trust' the arp requests if there is an active slave and
2341          * it received valid arp reply(s) after it became active. This
2342          * is done to avoid endless looping when we can't reach the
2343          * arp_ip_target and fool ourselves with our own arp requests.
2344          */
2345         if (bond_is_active_slave(slave))
2346                 bond_validate_arp(bond, slave, sip, tip);
2347         else if (bond->curr_active_slave &&
2348                  time_after(slave_last_rx(bond, bond->curr_active_slave),
2349                             bond->curr_active_slave->jiffies))
2350                 bond_validate_arp(bond, slave, tip, sip);
2351
2352 out_unlock:
2353         read_unlock(&bond->lock);
2354         if (arp != (struct arphdr *)skb->data)
2355                 kfree(arp);
2356         return RX_HANDLER_ANOTHER;
2357 }
2358
2359 /* function to verify if we're in the arp_interval timeslice, returns true if
2360  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2361  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2362  */
2363 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2364                                   int mod)
2365 {
2366         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2367
2368         return time_in_range(jiffies,
2369                              last_act - delta_in_ticks,
2370                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2371 }
2372
2373 /*
2374  * this function is called regularly to monitor each slave's link
2375  * ensuring that traffic is being sent and received when arp monitoring
2376  * is used in load-balancing mode. if the adapter has been dormant, then an
2377  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2378  * arp monitoring in active backup mode.
2379  */
2380 static void bond_loadbalance_arp_mon(struct work_struct *work)
2381 {
2382         struct bonding *bond = container_of(work, struct bonding,
2383                                             arp_work.work);
2384         struct slave *slave, *oldcurrent;
2385         struct list_head *iter;
2386         int do_failover = 0;
2387
2388         if (!bond_has_slaves(bond))
2389                 goto re_arm;
2390
2391         rcu_read_lock();
2392
2393         oldcurrent = ACCESS_ONCE(bond->curr_active_slave);
2394         /* see if any of the previous devices are up now (i.e. they have
2395          * xmt and rcv traffic). the curr_active_slave does not come into
2396          * the picture unless it is null. also, slave->jiffies is not needed
2397          * here because we send an arp on each slave and give a slave as
2398          * long as it needs to get the tx/rx within the delta.
2399          * TODO: what about up/down delay in arp mode? it wasn't here before
2400          *       so it can wait
2401          */
2402         bond_for_each_slave_rcu(bond, slave, iter) {
2403                 unsigned long trans_start = dev_trans_start(slave->dev);
2404
2405                 if (slave->link != BOND_LINK_UP) {
2406                         if (bond_time_in_interval(bond, trans_start, 1) &&
2407                             bond_time_in_interval(bond, slave->dev->last_rx, 1)) {
2408
2409                                 slave->link  = BOND_LINK_UP;
2410                                 bond_set_active_slave(slave);
2411
2412                                 /* primary_slave has no meaning in round-robin
2413                                  * mode. the window of a slave being up and
2414                                  * curr_active_slave being null after enslaving
2415                                  * is closed.
2416                                  */
2417                                 if (!oldcurrent) {
2418                                         pr_info("%s: link status definitely up for interface %s, ",
2419                                                 bond->dev->name,
2420                                                 slave->dev->name);
2421                                         do_failover = 1;
2422                                 } else {
2423                                         pr_info("%s: interface %s is now up\n",
2424                                                 bond->dev->name,
2425                                                 slave->dev->name);
2426                                 }
2427                         }
2428                 } else {
2429                         /* slave->link == BOND_LINK_UP */
2430
2431                         /* not all switches will respond to an arp request
2432                          * when the source ip is 0, so don't take the link down
2433                          * if we don't know our ip yet
2434                          */
2435                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2436                             !bond_time_in_interval(bond, slave->dev->last_rx, 2)) {
2437
2438                                 slave->link  = BOND_LINK_DOWN;
2439                                 bond_set_backup_slave(slave);
2440
2441                                 if (slave->link_failure_count < UINT_MAX)
2442                                         slave->link_failure_count++;
2443
2444                                 pr_info("%s: interface %s is now down.\n",
2445                                         bond->dev->name,
2446                                         slave->dev->name);
2447
2448                                 if (slave == oldcurrent)
2449                                         do_failover = 1;
2450                         }
2451                 }
2452
2453                 /* note: if switch is in round-robin mode, all links
2454                  * must tx arp to ensure all links rx an arp - otherwise
2455                  * links may oscillate or not come up at all; if switch is
2456                  * in something like xor mode, there is nothing we can
2457                  * do - all replies will be rx'ed on same link causing slaves
2458                  * to be unstable during low/no traffic periods
2459                  */
2460                 if (IS_UP(slave->dev))
2461                         bond_arp_send_all(bond, slave);
2462         }
2463
2464         rcu_read_unlock();
2465
2466         if (do_failover) {
2467                 /* the bond_select_active_slave must hold RTNL
2468                  * and curr_slave_lock for write.
2469                  */
2470                 if (!rtnl_trylock())
2471                         goto re_arm;
2472                 block_netpoll_tx();
2473                 write_lock_bh(&bond->curr_slave_lock);
2474
2475                 bond_select_active_slave(bond);
2476
2477                 write_unlock_bh(&bond->curr_slave_lock);
2478                 unblock_netpoll_tx();
2479                 rtnl_unlock();
2480         }
2481
2482 re_arm:
2483         if (bond->params.arp_interval)
2484                 queue_delayed_work(bond->wq, &bond->arp_work,
2485                                    msecs_to_jiffies(bond->params.arp_interval));
2486 }
2487
2488 /*
2489  * Called to inspect slaves for active-backup mode ARP monitor link state
2490  * changes.  Sets new_link in slaves to specify what action should take
2491  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2492  * to link states must be committed.
2493  *
2494  * Called with rcu_read_lock hold.
2495  */
2496 static int bond_ab_arp_inspect(struct bonding *bond)
2497 {
2498         unsigned long trans_start, last_rx;
2499         struct list_head *iter;
2500         struct slave *slave;
2501         int commit = 0;
2502
2503         bond_for_each_slave_rcu(bond, slave, iter) {
2504                 slave->new_link = BOND_LINK_NOCHANGE;
2505                 last_rx = slave_last_rx(bond, slave);
2506
2507                 if (slave->link != BOND_LINK_UP) {
2508                         if (bond_time_in_interval(bond, last_rx, 1)) {
2509                                 slave->new_link = BOND_LINK_UP;
2510                                 commit++;
2511                         }
2512                         continue;
2513                 }
2514
2515                 /*
2516                  * Give slaves 2*delta after being enslaved or made
2517                  * active.  This avoids bouncing, as the last receive
2518                  * times need a full ARP monitor cycle to be updated.
2519                  */
2520                 if (bond_time_in_interval(bond, slave->jiffies, 2))
2521                         continue;
2522
2523                 /*
2524                  * Backup slave is down if:
2525                  * - No current_arp_slave AND
2526                  * - more than 3*delta since last receive AND
2527                  * - the bond has an IP address
2528                  *
2529                  * Note: a non-null current_arp_slave indicates
2530                  * the curr_active_slave went down and we are
2531                  * searching for a new one; under this condition
2532                  * we only take the curr_active_slave down - this
2533                  * gives each slave a chance to tx/rx traffic
2534                  * before being taken out
2535                  */
2536                 if (!bond_is_active_slave(slave) &&
2537                     !bond->current_arp_slave &&
2538                     !bond_time_in_interval(bond, last_rx, 3)) {
2539                         slave->new_link = BOND_LINK_DOWN;
2540                         commit++;
2541                 }
2542
2543                 /*
2544                  * Active slave is down if:
2545                  * - more than 2*delta since transmitting OR
2546                  * - (more than 2*delta since receive AND
2547                  *    the bond has an IP address)
2548                  */
2549                 trans_start = dev_trans_start(slave->dev);
2550                 if (bond_is_active_slave(slave) &&
2551                     (!bond_time_in_interval(bond, trans_start, 2) ||
2552                      !bond_time_in_interval(bond, last_rx, 2))) {
2553                         slave->new_link = BOND_LINK_DOWN;
2554                         commit++;
2555                 }
2556         }
2557
2558         return commit;
2559 }
2560
2561 /*
2562  * Called to commit link state changes noted by inspection step of
2563  * active-backup mode ARP monitor.
2564  *
2565  * Called with RTNL hold.
2566  */
2567 static void bond_ab_arp_commit(struct bonding *bond)
2568 {
2569         unsigned long trans_start;
2570         struct list_head *iter;
2571         struct slave *slave;
2572
2573         bond_for_each_slave(bond, slave, iter) {
2574                 switch (slave->new_link) {
2575                 case BOND_LINK_NOCHANGE:
2576                         continue;
2577
2578                 case BOND_LINK_UP:
2579                         trans_start = dev_trans_start(slave->dev);
2580                         if (bond->curr_active_slave != slave ||
2581                             (!bond->curr_active_slave &&
2582                              bond_time_in_interval(bond, trans_start, 1))) {
2583                                 slave->link = BOND_LINK_UP;
2584                                 if (bond->current_arp_slave) {
2585                                         bond_set_slave_inactive_flags(
2586                                                 bond->current_arp_slave);
2587                                         bond->current_arp_slave = NULL;
2588                                 }
2589
2590                                 pr_info("%s: link status definitely up for interface %s.\n",
2591                                         bond->dev->name, slave->dev->name);
2592
2593                                 if (!bond->curr_active_slave ||
2594                                     (slave == bond->primary_slave))
2595                                         goto do_failover;
2596
2597                         }
2598
2599                         continue;
2600
2601                 case BOND_LINK_DOWN:
2602                         if (slave->link_failure_count < UINT_MAX)
2603                                 slave->link_failure_count++;
2604
2605                         slave->link = BOND_LINK_DOWN;
2606                         bond_set_slave_inactive_flags(slave);
2607
2608                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2609                                 bond->dev->name, slave->dev->name);
2610
2611                         if (slave == bond->curr_active_slave) {
2612                                 bond->current_arp_slave = NULL;
2613                                 goto do_failover;
2614                         }
2615
2616                         continue;
2617
2618                 default:
2619                         pr_err("%s: impossible: new_link %d on slave %s\n",
2620                                bond->dev->name, slave->new_link,
2621                                slave->dev->name);
2622                         continue;
2623                 }
2624
2625 do_failover:
2626                 ASSERT_RTNL();
2627                 block_netpoll_tx();
2628                 write_lock_bh(&bond->curr_slave_lock);
2629                 bond_select_active_slave(bond);
2630                 write_unlock_bh(&bond->curr_slave_lock);
2631                 unblock_netpoll_tx();
2632         }
2633
2634         bond_set_carrier(bond);
2635 }
2636
2637 /*
2638  * Send ARP probes for active-backup mode ARP monitor.
2639  *
2640  * Called with rcu_read_lock hold.
2641  */
2642 static void bond_ab_arp_probe(struct bonding *bond)
2643 {
2644         struct slave *slave, *before = NULL, *new_slave = NULL,
2645                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2646         struct list_head *iter;
2647         bool found = false;
2648
2649         read_lock(&bond->curr_slave_lock);
2650
2651         if (curr_arp_slave && bond->curr_active_slave)
2652                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
2653                         curr_arp_slave->dev->name,
2654                         bond->curr_active_slave->dev->name);
2655
2656         if (bond->curr_active_slave) {
2657                 bond_arp_send_all(bond, bond->curr_active_slave);
2658                 read_unlock(&bond->curr_slave_lock);
2659                 return;
2660         }
2661
2662         read_unlock(&bond->curr_slave_lock);
2663
2664         /* if we don't have a curr_active_slave, search for the next available
2665          * backup slave from the current_arp_slave and make it the candidate
2666          * for becoming the curr_active_slave
2667          */
2668
2669         if (!curr_arp_slave) {
2670                 curr_arp_slave = bond_first_slave_rcu(bond);
2671                 if (!curr_arp_slave)
2672                         return;
2673         }
2674
2675         bond_set_slave_inactive_flags(curr_arp_slave);
2676
2677         bond_for_each_slave_rcu(bond, slave, iter) {
2678                 if (!found && !before && IS_UP(slave->dev))
2679                         before = slave;
2680
2681                 if (found && !new_slave && IS_UP(slave->dev))
2682                         new_slave = slave;
2683                 /* if the link state is up at this point, we
2684                  * mark it down - this can happen if we have
2685                  * simultaneous link failures and
2686                  * reselect_active_interface doesn't make this
2687                  * one the current slave so it is still marked
2688                  * up when it is actually down
2689                  */
2690                 if (!IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
2691                         slave->link = BOND_LINK_DOWN;
2692                         if (slave->link_failure_count < UINT_MAX)
2693                                 slave->link_failure_count++;
2694
2695                         bond_set_slave_inactive_flags(slave);
2696
2697                         pr_info("%s: backup interface %s is now down.\n",
2698                                 bond->dev->name, slave->dev->name);
2699                 }
2700                 if (slave == curr_arp_slave)
2701                         found = true;
2702         }
2703
2704         if (!new_slave && before)
2705                 new_slave = before;
2706
2707         if (!new_slave)
2708                 return;
2709
2710         new_slave->link = BOND_LINK_BACK;
2711         bond_set_slave_active_flags(new_slave);
2712         bond_arp_send_all(bond, new_slave);
2713         new_slave->jiffies = jiffies;
2714         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2715 }
2716
2717 static void bond_activebackup_arp_mon(struct work_struct *work)
2718 {
2719         struct bonding *bond = container_of(work, struct bonding,
2720                                             arp_work.work);
2721         bool should_notify_peers = false;
2722         int delta_in_ticks;
2723
2724         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2725
2726         if (!bond_has_slaves(bond))
2727                 goto re_arm;
2728
2729         rcu_read_lock();
2730
2731         should_notify_peers = bond_should_notify_peers(bond);
2732
2733         if (bond_ab_arp_inspect(bond)) {
2734                 rcu_read_unlock();
2735
2736                 /* Race avoidance with bond_close flush of workqueue */
2737                 if (!rtnl_trylock()) {
2738                         delta_in_ticks = 1;
2739                         should_notify_peers = false;
2740                         goto re_arm;
2741                 }
2742
2743                 bond_ab_arp_commit(bond);
2744
2745                 rtnl_unlock();
2746                 rcu_read_lock();
2747         }
2748
2749         bond_ab_arp_probe(bond);
2750         rcu_read_unlock();
2751
2752 re_arm:
2753         if (bond->params.arp_interval)
2754                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2755
2756         if (should_notify_peers) {
2757                 if (!rtnl_trylock())
2758                         return;
2759                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2760                 rtnl_unlock();
2761         }
2762 }
2763
2764 /*-------------------------- netdev event handling --------------------------*/
2765
2766 /*
2767  * Change device name
2768  */
2769 static int bond_event_changename(struct bonding *bond)
2770 {
2771         bond_remove_proc_entry(bond);
2772         bond_create_proc_entry(bond);
2773
2774         bond_debug_reregister(bond);
2775
2776         return NOTIFY_DONE;
2777 }
2778
2779 static int bond_master_netdev_event(unsigned long event,
2780                                     struct net_device *bond_dev)
2781 {
2782         struct bonding *event_bond = netdev_priv(bond_dev);
2783
2784         switch (event) {
2785         case NETDEV_CHANGENAME:
2786                 return bond_event_changename(event_bond);
2787         case NETDEV_UNREGISTER:
2788                 bond_remove_proc_entry(event_bond);
2789                 break;
2790         case NETDEV_REGISTER:
2791                 bond_create_proc_entry(event_bond);
2792                 break;
2793         case NETDEV_NOTIFY_PEERS:
2794                 if (event_bond->send_peer_notif)
2795                         event_bond->send_peer_notif--;
2796                 break;
2797         default:
2798                 break;
2799         }
2800
2801         return NOTIFY_DONE;
2802 }
2803
2804 static int bond_slave_netdev_event(unsigned long event,
2805                                    struct net_device *slave_dev)
2806 {
2807         struct slave *slave = bond_slave_get_rtnl(slave_dev);
2808         struct bonding *bond;
2809         struct net_device *bond_dev;
2810         u32 old_speed;
2811         u8 old_duplex;
2812
2813         /* A netdev event can be generated while enslaving a device
2814          * before netdev_rx_handler_register is called in which case
2815          * slave will be NULL
2816          */
2817         if (!slave)
2818                 return NOTIFY_DONE;
2819         bond_dev = slave->bond->dev;
2820         bond = slave->bond;
2821
2822         switch (event) {
2823         case NETDEV_UNREGISTER:
2824                 if (bond_dev->type != ARPHRD_ETHER)
2825                         bond_release_and_destroy(bond_dev, slave_dev);
2826                 else
2827                         bond_release(bond_dev, slave_dev);
2828                 break;
2829         case NETDEV_UP:
2830         case NETDEV_CHANGE:
2831                 old_speed = slave->speed;
2832                 old_duplex = slave->duplex;
2833
2834                 bond_update_speed_duplex(slave);
2835
2836                 if (bond->params.mode == BOND_MODE_8023AD) {
2837                         if (old_speed != slave->speed)
2838                                 bond_3ad_adapter_speed_changed(slave);
2839                         if (old_duplex != slave->duplex)
2840                                 bond_3ad_adapter_duplex_changed(slave);
2841                 }
2842                 break;
2843         case NETDEV_DOWN:
2844                 /*
2845                  * ... Or is it this?
2846                  */
2847                 break;
2848         case NETDEV_CHANGEMTU:
2849                 /*
2850                  * TODO: Should slaves be allowed to
2851                  * independently alter their MTU?  For
2852                  * an active-backup bond, slaves need
2853                  * not be the same type of device, so
2854                  * MTUs may vary.  For other modes,
2855                  * slaves arguably should have the
2856                  * same MTUs. To do this, we'd need to
2857                  * take over the slave's change_mtu
2858                  * function for the duration of their
2859                  * servitude.
2860                  */
2861                 break;
2862         case NETDEV_CHANGENAME:
2863                 /*
2864                  * TODO: handle changing the primary's name
2865                  */
2866                 break;
2867         case NETDEV_FEAT_CHANGE:
2868                 bond_compute_features(bond);
2869                 break;
2870         case NETDEV_RESEND_IGMP:
2871                 /* Propagate to master device */
2872                 call_netdevice_notifiers(event, slave->bond->dev);
2873                 break;
2874         default:
2875                 break;
2876         }
2877
2878         return NOTIFY_DONE;
2879 }
2880
2881 /*
2882  * bond_netdev_event: handle netdev notifier chain events.
2883  *
2884  * This function receives events for the netdev chain.  The caller (an
2885  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
2886  * locks for us to safely manipulate the slave devices (RTNL lock,
2887  * dev_probe_lock).
2888  */
2889 static int bond_netdev_event(struct notifier_block *this,
2890                              unsigned long event, void *ptr)
2891 {
2892         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2893
2894         pr_debug("event_dev: %s, event: %lx\n",
2895                  event_dev ? event_dev->name : "None",
2896                  event);
2897
2898         if (!(event_dev->priv_flags & IFF_BONDING))
2899                 return NOTIFY_DONE;
2900
2901         if (event_dev->flags & IFF_MASTER) {
2902                 pr_debug("IFF_MASTER\n");
2903                 return bond_master_netdev_event(event, event_dev);
2904         }
2905
2906         if (event_dev->flags & IFF_SLAVE) {
2907                 pr_debug("IFF_SLAVE\n");
2908                 return bond_slave_netdev_event(event, event_dev);
2909         }
2910
2911         return NOTIFY_DONE;
2912 }
2913
2914 static struct notifier_block bond_netdev_notifier = {
2915         .notifier_call = bond_netdev_event,
2916 };
2917
2918 /*---------------------------- Hashing Policies -----------------------------*/
2919
2920 /* L2 hash helper */
2921 static inline u32 bond_eth_hash(struct sk_buff *skb)
2922 {
2923         struct ethhdr *data = (struct ethhdr *)skb->data;
2924
2925         if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
2926                 return data->h_dest[5] ^ data->h_source[5];
2927
2928         return 0;
2929 }
2930
2931 /* Extract the appropriate headers based on bond's xmit policy */
2932 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
2933                               struct flow_keys *fk)
2934 {
2935         const struct ipv6hdr *iph6;
2936         const struct iphdr *iph;
2937         int noff, proto = -1;
2938
2939         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
2940                 return skb_flow_dissect(skb, fk);
2941
2942         fk->ports = 0;
2943         noff = skb_network_offset(skb);
2944         if (skb->protocol == htons(ETH_P_IP)) {
2945                 if (!pskb_may_pull(skb, noff + sizeof(*iph)))
2946                         return false;
2947                 iph = ip_hdr(skb);
2948                 fk->src = iph->saddr;
2949                 fk->dst = iph->daddr;
2950                 noff += iph->ihl << 2;
2951                 if (!ip_is_fragment(iph))
2952                         proto = iph->protocol;
2953         } else if (skb->protocol == htons(ETH_P_IPV6)) {
2954                 if (!pskb_may_pull(skb, noff + sizeof(*iph6)))
2955                         return false;
2956                 iph6 = ipv6_hdr(skb);
2957                 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
2958                 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
2959                 noff += sizeof(*iph6);
2960                 proto = iph6->nexthdr;
2961         } else {
2962                 return false;
2963         }
2964         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
2965                 fk->ports = skb_flow_get_ports(skb, noff, proto);
2966
2967         return true;
2968 }
2969
2970 /**
2971  * bond_xmit_hash - generate a hash value based on the xmit policy
2972  * @bond: bonding device
2973  * @skb: buffer to use for headers
2974  * @count: modulo value
2975  *
2976  * This function will extract the necessary headers from the skb buffer and use
2977  * them to generate a hash based on the xmit_policy set in the bonding device
2978  * which will be reduced modulo count before returning.
2979  */
2980 int bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, int count)
2981 {
2982         struct flow_keys flow;
2983         u32 hash;
2984
2985         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
2986             !bond_flow_dissect(bond, skb, &flow))
2987                 return bond_eth_hash(skb) % count;
2988
2989         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
2990             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
2991                 hash = bond_eth_hash(skb);
2992         else
2993                 hash = (__force u32)flow.ports;
2994         hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
2995         hash ^= (hash >> 16);
2996         hash ^= (hash >> 8);
2997
2998         return hash % count;
2999 }
3000
3001 /*-------------------------- Device entry points ----------------------------*/
3002
3003 static void bond_work_init_all(struct bonding *bond)
3004 {
3005         INIT_DELAYED_WORK(&bond->mcast_work,
3006                           bond_resend_igmp_join_requests_delayed);
3007         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3008         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3009         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3010                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3011         else
3012                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3013         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3014 }
3015
3016 static void bond_work_cancel_all(struct bonding *bond)
3017 {
3018         cancel_delayed_work_sync(&bond->mii_work);
3019         cancel_delayed_work_sync(&bond->arp_work);
3020         cancel_delayed_work_sync(&bond->alb_work);
3021         cancel_delayed_work_sync(&bond->ad_work);
3022         cancel_delayed_work_sync(&bond->mcast_work);
3023 }
3024
3025 static int bond_open(struct net_device *bond_dev)
3026 {
3027         struct bonding *bond = netdev_priv(bond_dev);
3028         struct list_head *iter;
3029         struct slave *slave;
3030
3031         /* reset slave->backup and slave->inactive */
3032         read_lock(&bond->lock);
3033         if (bond_has_slaves(bond)) {
3034                 read_lock(&bond->curr_slave_lock);
3035                 bond_for_each_slave(bond, slave, iter) {
3036                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3037                                 && (slave != bond->curr_active_slave)) {
3038                                 bond_set_slave_inactive_flags(slave);
3039                         } else {
3040                                 bond_set_slave_active_flags(slave);
3041                         }
3042                 }
3043                 read_unlock(&bond->curr_slave_lock);
3044         }
3045         read_unlock(&bond->lock);
3046
3047         bond_work_init_all(bond);
3048
3049         if (bond_is_lb(bond)) {
3050                 /* bond_alb_initialize must be called before the timer
3051                  * is started.
3052                  */
3053                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3054                         return -ENOMEM;
3055                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3056         }
3057
3058         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3059                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3060
3061         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3062                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3063                 if (bond->params.arp_validate)
3064                         bond->recv_probe = bond_arp_rcv;
3065         }
3066
3067         if (bond->params.mode == BOND_MODE_8023AD) {
3068                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3069                 /* register to receive LACPDUs */
3070                 bond->recv_probe = bond_3ad_lacpdu_recv;
3071                 bond_3ad_initiate_agg_selection(bond, 1);
3072         }
3073
3074         return 0;
3075 }
3076
3077 static int bond_close(struct net_device *bond_dev)
3078 {
3079         struct bonding *bond = netdev_priv(bond_dev);
3080
3081         bond_work_cancel_all(bond);
3082         bond->send_peer_notif = 0;
3083         if (bond_is_lb(bond))
3084                 bond_alb_deinitialize(bond);
3085         bond->recv_probe = NULL;
3086
3087         return 0;
3088 }
3089
3090 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3091                                                 struct rtnl_link_stats64 *stats)
3092 {
3093         struct bonding *bond = netdev_priv(bond_dev);
3094         struct rtnl_link_stats64 temp;
3095         struct list_head *iter;
3096         struct slave *slave;
3097
3098         memset(stats, 0, sizeof(*stats));
3099
3100         read_lock_bh(&bond->lock);
3101         bond_for_each_slave(bond, slave, iter) {
3102                 const struct rtnl_link_stats64 *sstats =
3103                         dev_get_stats(slave->dev, &temp);
3104
3105                 stats->rx_packets += sstats->rx_packets;
3106                 stats->rx_bytes += sstats->rx_bytes;
3107                 stats->rx_errors += sstats->rx_errors;
3108                 stats->rx_dropped += sstats->rx_dropped;
3109
3110                 stats->tx_packets += sstats->tx_packets;
3111                 stats->tx_bytes += sstats->tx_bytes;
3112                 stats->tx_errors += sstats->tx_errors;
3113                 stats->tx_dropped += sstats->tx_dropped;
3114
3115                 stats->multicast += sstats->multicast;
3116                 stats->collisions += sstats->collisions;
3117
3118                 stats->rx_length_errors += sstats->rx_length_errors;
3119                 stats->rx_over_errors += sstats->rx_over_errors;
3120                 stats->rx_crc_errors += sstats->rx_crc_errors;
3121                 stats->rx_frame_errors += sstats->rx_frame_errors;
3122                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3123                 stats->rx_missed_errors += sstats->rx_missed_errors;
3124
3125                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3126                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3127                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3128                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3129                 stats->tx_window_errors += sstats->tx_window_errors;
3130         }
3131         read_unlock_bh(&bond->lock);
3132
3133         return stats;
3134 }
3135
3136 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3137 {
3138         struct bonding *bond = netdev_priv(bond_dev);
3139         struct net_device *slave_dev = NULL;
3140         struct ifbond k_binfo;
3141         struct ifbond __user *u_binfo = NULL;
3142         struct ifslave k_sinfo;
3143         struct ifslave __user *u_sinfo = NULL;
3144         struct mii_ioctl_data *mii = NULL;
3145         struct net *net;
3146         int res = 0;
3147
3148         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3149
3150         switch (cmd) {
3151         case SIOCGMIIPHY:
3152                 mii = if_mii(ifr);
3153                 if (!mii)
3154                         return -EINVAL;
3155
3156                 mii->phy_id = 0;
3157                 /* Fall Through */
3158         case SIOCGMIIREG:
3159                 /*
3160                  * We do this again just in case we were called by SIOCGMIIREG
3161                  * instead of SIOCGMIIPHY.
3162                  */
3163                 mii = if_mii(ifr);
3164                 if (!mii)
3165                         return -EINVAL;
3166
3167
3168                 if (mii->reg_num == 1) {
3169                         mii->val_out = 0;
3170                         read_lock(&bond->lock);
3171                         read_lock(&bond->curr_slave_lock);
3172                         if (netif_carrier_ok(bond->dev))
3173                                 mii->val_out = BMSR_LSTATUS;
3174
3175                         read_unlock(&bond->curr_slave_lock);
3176                         read_unlock(&bond->lock);
3177                 }
3178
3179                 return 0;
3180         case BOND_INFO_QUERY_OLD:
3181         case SIOCBONDINFOQUERY:
3182                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3183
3184                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3185                         return -EFAULT;
3186
3187                 res = bond_info_query(bond_dev, &k_binfo);
3188                 if (res == 0 &&
3189                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3190                         return -EFAULT;
3191
3192                 return res;
3193         case BOND_SLAVE_INFO_QUERY_OLD:
3194         case SIOCBONDSLAVEINFOQUERY:
3195                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3196
3197                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3198                         return -EFAULT;
3199
3200                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3201                 if (res == 0 &&
3202                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3203                         return -EFAULT;
3204
3205                 return res;
3206         default:
3207                 /* Go on */
3208                 break;
3209         }
3210
3211         net = dev_net(bond_dev);
3212
3213         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3214                 return -EPERM;
3215
3216         slave_dev = dev_get_by_name(net, ifr->ifr_slave);
3217
3218         pr_debug("slave_dev=%p:\n", slave_dev);
3219
3220         if (!slave_dev)
3221                 res = -ENODEV;
3222         else {
3223                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3224                 switch (cmd) {
3225                 case BOND_ENSLAVE_OLD:
3226                 case SIOCBONDENSLAVE:
3227                         res = bond_enslave(bond_dev, slave_dev);
3228                         break;
3229                 case BOND_RELEASE_OLD:
3230                 case SIOCBONDRELEASE:
3231                         res = bond_release(bond_dev, slave_dev);
3232                         break;
3233                 case BOND_SETHWADDR_OLD:
3234                 case SIOCBONDSETHWADDR:
3235                         bond_set_dev_addr(bond_dev, slave_dev);
3236                         res = 0;
3237                         break;
3238                 case BOND_CHANGE_ACTIVE_OLD:
3239                 case SIOCBONDCHANGEACTIVE:
3240                         res = bond_option_active_slave_set(bond, slave_dev);
3241                         break;
3242                 default:
3243                         res = -EOPNOTSUPP;
3244                 }
3245
3246                 dev_put(slave_dev);
3247         }
3248
3249         return res;
3250 }
3251
3252 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3253 {
3254         struct bonding *bond = netdev_priv(bond_dev);
3255
3256         if (change & IFF_PROMISC)
3257                 bond_set_promiscuity(bond,
3258                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3259
3260         if (change & IFF_ALLMULTI)
3261                 bond_set_allmulti(bond,
3262                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3263 }
3264
3265 static void bond_set_rx_mode(struct net_device *bond_dev)
3266 {
3267         struct bonding *bond = netdev_priv(bond_dev);
3268         struct list_head *iter;
3269         struct slave *slave;
3270
3271
3272         rcu_read_lock();
3273         if (USES_PRIMARY(bond->params.mode)) {
3274                 slave = rcu_dereference(bond->curr_active_slave);
3275                 if (slave) {
3276                         dev_uc_sync(slave->dev, bond_dev);
3277                         dev_mc_sync(slave->dev, bond_dev);
3278                 }
3279         } else {
3280                 bond_for_each_slave_rcu(bond, slave, iter) {
3281                         dev_uc_sync_multiple(slave->dev, bond_dev);
3282                         dev_mc_sync_multiple(slave->dev, bond_dev);
3283                 }
3284         }
3285         rcu_read_unlock();
3286 }
3287
3288 static int bond_neigh_init(struct neighbour *n)
3289 {
3290         struct bonding *bond = netdev_priv(n->dev);
3291         const struct net_device_ops *slave_ops;
3292         struct neigh_parms parms;
3293         struct slave *slave;
3294         int ret;
3295
3296         slave = bond_first_slave(bond);
3297         if (!slave)
3298                 return 0;
3299         slave_ops = slave->dev->netdev_ops;
3300         if (!slave_ops->ndo_neigh_setup)
3301                 return 0;
3302
3303         parms.neigh_setup = NULL;
3304         parms.neigh_cleanup = NULL;
3305         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3306         if (ret)
3307                 return ret;
3308
3309         /*
3310          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3311          * after the last slave has been detached.  Assumes that all slaves
3312          * utilize the same neigh_cleanup (true at this writing as only user
3313          * is ipoib).
3314          */
3315         n->parms->neigh_cleanup = parms.neigh_cleanup;
3316
3317         if (!parms.neigh_setup)
3318                 return 0;
3319
3320         return parms.neigh_setup(n);
3321 }
3322
3323 /*
3324  * The bonding ndo_neigh_setup is called at init time beofre any
3325  * slave exists. So we must declare proxy setup function which will
3326  * be used at run time to resolve the actual slave neigh param setup.
3327  *
3328  * It's also called by master devices (such as vlans) to setup their
3329  * underlying devices. In that case - do nothing, we're already set up from
3330  * our init.
3331  */
3332 static int bond_neigh_setup(struct net_device *dev,
3333                             struct neigh_parms *parms)
3334 {
3335         /* modify only our neigh_parms */
3336         if (parms->dev == dev)
3337                 parms->neigh_setup = bond_neigh_init;
3338
3339         return 0;
3340 }
3341
3342 /*
3343  * Change the MTU of all of a master's slaves to match the master
3344  */
3345 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3346 {
3347         struct bonding *bond = netdev_priv(bond_dev);
3348         struct slave *slave, *rollback_slave;
3349         struct list_head *iter;
3350         int res = 0;
3351
3352         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3353                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3354
3355         /* Can't hold bond->lock with bh disabled here since
3356          * some base drivers panic. On the other hand we can't
3357          * hold bond->lock without bh disabled because we'll
3358          * deadlock. The only solution is to rely on the fact
3359          * that we're under rtnl_lock here, and the slaves
3360          * list won't change. This doesn't solve the problem
3361          * of setting the slave's MTU while it is
3362          * transmitting, but the assumption is that the base
3363          * driver can handle that.
3364          *
3365          * TODO: figure out a way to safely iterate the slaves
3366          * list, but without holding a lock around the actual
3367          * call to the base driver.
3368          */
3369
3370         bond_for_each_slave(bond, slave, iter) {
3371                 pr_debug("s %p c_m %p\n",
3372                          slave,
3373                          slave->dev->netdev_ops->ndo_change_mtu);
3374
3375                 res = dev_set_mtu(slave->dev, new_mtu);
3376
3377                 if (res) {
3378                         /* If we failed to set the slave's mtu to the new value
3379                          * we must abort the operation even in ACTIVE_BACKUP
3380                          * mode, because if we allow the backup slaves to have
3381                          * different mtu values than the active slave we'll
3382                          * need to change their mtu when doing a failover. That
3383                          * means changing their mtu from timer context, which
3384                          * is probably not a good idea.
3385                          */
3386                         pr_debug("err %d %s\n", res, slave->dev->name);
3387                         goto unwind;
3388                 }
3389         }
3390
3391         bond_dev->mtu = new_mtu;
3392
3393         return 0;
3394
3395 unwind:
3396         /* unwind from head to the slave that failed */
3397         bond_for_each_slave(bond, rollback_slave, iter) {
3398                 int tmp_res;
3399
3400                 if (rollback_slave == slave)
3401                         break;
3402
3403                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3404                 if (tmp_res) {
3405                         pr_debug("unwind err %d dev %s\n",
3406                                  tmp_res, rollback_slave->dev->name);
3407                 }
3408         }
3409
3410         return res;
3411 }
3412
3413 /*
3414  * Change HW address
3415  *
3416  * Note that many devices must be down to change the HW address, and
3417  * downing the master releases all slaves.  We can make bonds full of
3418  * bonding devices to test this, however.
3419  */
3420 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3421 {
3422         struct bonding *bond = netdev_priv(bond_dev);
3423         struct slave *slave, *rollback_slave;
3424         struct sockaddr *sa = addr, tmp_sa;
3425         struct list_head *iter;
3426         int res = 0;
3427
3428         if (bond->params.mode == BOND_MODE_ALB)
3429                 return bond_alb_set_mac_address(bond_dev, addr);
3430
3431
3432         pr_debug("bond=%p, name=%s\n",
3433                  bond, bond_dev ? bond_dev->name : "None");
3434
3435         /* If fail_over_mac is enabled, do nothing and return success.
3436          * Returning an error causes ifenslave to fail.
3437          */
3438         if (bond->params.fail_over_mac)
3439                 return 0;
3440
3441         if (!is_valid_ether_addr(sa->sa_data))
3442                 return -EADDRNOTAVAIL;
3443
3444         /* Can't hold bond->lock with bh disabled here since
3445          * some base drivers panic. On the other hand we can't
3446          * hold bond->lock without bh disabled because we'll
3447          * deadlock. The only solution is to rely on the fact
3448          * that we're under rtnl_lock here, and the slaves
3449          * list won't change. This doesn't solve the problem
3450          * of setting the slave's hw address while it is
3451          * transmitting, but the assumption is that the base
3452          * driver can handle that.
3453          *
3454          * TODO: figure out a way to safely iterate the slaves
3455          * list, but without holding a lock around the actual
3456          * call to the base driver.
3457          */
3458
3459         bond_for_each_slave(bond, slave, iter) {
3460                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3461                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3462
3463                 if (slave_ops->ndo_set_mac_address == NULL) {
3464                         res = -EOPNOTSUPP;
3465                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3466                         goto unwind;
3467                 }
3468
3469                 res = dev_set_mac_address(slave->dev, addr);
3470                 if (res) {
3471                         /* TODO: consider downing the slave
3472                          * and retry ?
3473                          * User should expect communications
3474                          * breakage anyway until ARP finish
3475                          * updating, so...
3476                          */
3477                         pr_debug("err %d %s\n", res, slave->dev->name);
3478                         goto unwind;
3479                 }
3480         }
3481
3482         /* success */
3483         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3484         return 0;
3485
3486 unwind:
3487         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3488         tmp_sa.sa_family = bond_dev->type;
3489
3490         /* unwind from head to the slave that failed */
3491         bond_for_each_slave(bond, rollback_slave, iter) {
3492                 int tmp_res;
3493
3494                 if (rollback_slave == slave)
3495                         break;
3496
3497                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3498                 if (tmp_res) {
3499                         pr_debug("unwind err %d dev %s\n",
3500                                  tmp_res, rollback_slave->dev->name);
3501                 }
3502         }
3503
3504         return res;
3505 }
3506
3507 /**
3508  * bond_xmit_slave_id - transmit skb through slave with slave_id
3509  * @bond: bonding device that is transmitting
3510  * @skb: buffer to transmit
3511  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3512  *
3513  * This function tries to transmit through slave with slave_id but in case
3514  * it fails, it tries to find the first available slave for transmission.
3515  * The skb is consumed in all cases, thus the function is void.
3516  */
3517 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3518 {
3519         struct list_head *iter;
3520         struct slave *slave;
3521         int i = slave_id;
3522
3523         /* Here we start from the slave with slave_id */
3524         bond_for_each_slave_rcu(bond, slave, iter) {
3525                 if (--i < 0) {
3526                         if (slave_can_tx(slave)) {
3527                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3528                                 return;
3529                         }
3530                 }
3531         }
3532
3533         /* Here we start from the first slave up to slave_id */
3534         i = slave_id;
3535         bond_for_each_slave_rcu(bond, slave, iter) {
3536                 if (--i < 0)
3537                         break;
3538                 if (slave_can_tx(slave)) {
3539                         bond_dev_queue_xmit(bond, skb, slave->dev);
3540                         return;
3541                 }
3542         }
3543         /* no slave that can tx has been found */
3544         kfree_skb(skb);
3545 }
3546
3547 /**
3548  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3549  * @bond: bonding device to use
3550  *
3551  * Based on the value of the bonding device's packets_per_slave parameter
3552  * this function generates a slave id, which is usually used as the next
3553  * slave to transmit through.
3554  */
3555 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3556 {
3557         int packets_per_slave = bond->params.packets_per_slave;
3558         u32 slave_id;
3559
3560         switch (packets_per_slave) {
3561         case 0:
3562                 slave_id = prandom_u32();
3563                 break;
3564         case 1:
3565                 slave_id = bond->rr_tx_counter;
3566                 break;
3567         default:
3568                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3569                                              packets_per_slave);
3570                 break;
3571         }
3572         bond->rr_tx_counter++;
3573
3574         return slave_id;
3575 }
3576
3577 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3578 {
3579         struct bonding *bond = netdev_priv(bond_dev);
3580         struct iphdr *iph = ip_hdr(skb);
3581         struct slave *slave;
3582         u32 slave_id;
3583
3584         /* Start with the curr_active_slave that joined the bond as the
3585          * default for sending IGMP traffic.  For failover purposes one
3586          * needs to maintain some consistency for the interface that will
3587          * send the join/membership reports.  The curr_active_slave found
3588          * will send all of this type of traffic.
3589          */
3590         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3591                 slave = rcu_dereference(bond->curr_active_slave);
3592                 if (slave && slave_can_tx(slave))
3593                         bond_dev_queue_xmit(bond, skb, slave->dev);
3594                 else
3595                         bond_xmit_slave_id(bond, skb, 0);
3596         } else {
3597                 slave_id = bond_rr_gen_slave_id(bond);
3598                 bond_xmit_slave_id(bond, skb, slave_id % bond->slave_cnt);
3599         }
3600
3601         return NETDEV_TX_OK;
3602 }
3603
3604 /*
3605  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3606  * the bond has a usable interface.
3607  */
3608 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3609 {
3610         struct bonding *bond = netdev_priv(bond_dev);
3611         struct slave *slave;
3612
3613         slave = rcu_dereference(bond->curr_active_slave);
3614         if (slave)
3615                 bond_dev_queue_xmit(bond, skb, slave->dev);
3616         else
3617                 kfree_skb(skb);
3618
3619         return NETDEV_TX_OK;
3620 }
3621
3622 /* In bond_xmit_xor() , we determine the output device by using a pre-
3623  * determined xmit_hash_policy(), If the selected device is not enabled,
3624  * find the next active slave.
3625  */
3626 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3627 {
3628         struct bonding *bond = netdev_priv(bond_dev);
3629
3630         bond_xmit_slave_id(bond, skb, bond_xmit_hash(bond, skb, bond->slave_cnt));
3631
3632         return NETDEV_TX_OK;
3633 }
3634
3635 /* in broadcast mode, we send everything to all usable interfaces. */
3636 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3637 {
3638         struct bonding *bond = netdev_priv(bond_dev);
3639         struct slave *slave = NULL;
3640         struct list_head *iter;
3641
3642         bond_for_each_slave_rcu(bond, slave, iter) {
3643                 if (bond_is_last_slave(bond, slave))
3644                         break;
3645                 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
3646                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3647
3648                         if (!skb2) {
3649                                 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
3650                                        bond_dev->name);
3651                                 continue;
3652                         }
3653                         /* bond_dev_queue_xmit always returns 0 */
3654                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3655                 }
3656         }
3657         if (slave && IS_UP(slave->dev) && slave->link == BOND_LINK_UP)
3658                 bond_dev_queue_xmit(bond, skb, slave->dev);
3659         else
3660                 kfree_skb(skb);
3661
3662         return NETDEV_TX_OK;
3663 }
3664
3665 /*------------------------- Device initialization ---------------------------*/
3666
3667 /*
3668  * Lookup the slave that corresponds to a qid
3669  */
3670 static inline int bond_slave_override(struct bonding *bond,
3671                                       struct sk_buff *skb)
3672 {
3673         struct slave *slave = NULL;
3674         struct list_head *iter;
3675
3676         if (!skb->queue_mapping)
3677                 return 1;
3678
3679         /* Find out if any slaves have the same mapping as this skb. */
3680         bond_for_each_slave_rcu(bond, slave, iter) {
3681                 if (slave->queue_id == skb->queue_mapping) {
3682                         if (slave_can_tx(slave)) {
3683                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3684                                 return 0;
3685                         }
3686                         /* If the slave isn't UP, use default transmit policy. */
3687                         break;
3688                 }
3689         }
3690
3691         return 1;
3692 }
3693
3694
3695 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
3696 {
3697         /*
3698          * This helper function exists to help dev_pick_tx get the correct
3699          * destination queue.  Using a helper function skips a call to
3700          * skb_tx_hash and will put the skbs in the queue we expect on their
3701          * way down to the bonding driver.
3702          */
3703         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3704
3705         /*
3706          * Save the original txq to restore before passing to the driver
3707          */
3708         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3709
3710         if (unlikely(txq >= dev->real_num_tx_queues)) {
3711                 do {
3712                         txq -= dev->real_num_tx_queues;
3713                 } while (txq >= dev->real_num_tx_queues);
3714         }
3715         return txq;
3716 }
3717
3718 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3719 {
3720         struct bonding *bond = netdev_priv(dev);
3721
3722         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
3723                 if (!bond_slave_override(bond, skb))
3724                         return NETDEV_TX_OK;
3725         }
3726
3727         switch (bond->params.mode) {
3728         case BOND_MODE_ROUNDROBIN:
3729                 return bond_xmit_roundrobin(skb, dev);
3730         case BOND_MODE_ACTIVEBACKUP:
3731                 return bond_xmit_activebackup(skb, dev);
3732         case BOND_MODE_XOR:
3733                 return bond_xmit_xor(skb, dev);
3734         case BOND_MODE_BROADCAST:
3735                 return bond_xmit_broadcast(skb, dev);
3736         case BOND_MODE_8023AD:
3737                 return bond_3ad_xmit_xor(skb, dev);
3738         case BOND_MODE_ALB:
3739         case BOND_MODE_TLB:
3740                 return bond_alb_xmit(skb, dev);
3741         default:
3742                 /* Should never happen, mode already checked */
3743                 pr_err("%s: Error: Unknown bonding mode %d\n",
3744                        dev->name, bond->params.mode);
3745                 WARN_ON_ONCE(1);
3746                 kfree_skb(skb);
3747                 return NETDEV_TX_OK;
3748         }
3749 }
3750
3751 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3752 {
3753         struct bonding *bond = netdev_priv(dev);
3754         netdev_tx_t ret = NETDEV_TX_OK;
3755
3756         /*
3757          * If we risk deadlock from transmitting this in the
3758          * netpoll path, tell netpoll to queue the frame for later tx
3759          */
3760         if (is_netpoll_tx_blocked(dev))
3761                 return NETDEV_TX_BUSY;
3762
3763         rcu_read_lock();
3764         if (bond_has_slaves(bond))
3765                 ret = __bond_start_xmit(skb, dev);
3766         else
3767                 kfree_skb(skb);
3768         rcu_read_unlock();
3769
3770         return ret;
3771 }
3772
3773 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3774                                      struct ethtool_cmd *ecmd)
3775 {
3776         struct bonding *bond = netdev_priv(bond_dev);
3777         unsigned long speed = 0;
3778         struct list_head *iter;
3779         struct slave *slave;
3780
3781         ecmd->duplex = DUPLEX_UNKNOWN;
3782         ecmd->port = PORT_OTHER;
3783
3784         /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
3785          * do not need to check mode.  Though link speed might not represent
3786          * the true receive or transmit bandwidth (not all modes are symmetric)
3787          * this is an accurate maximum.
3788          */
3789         read_lock(&bond->lock);
3790         bond_for_each_slave(bond, slave, iter) {
3791                 if (SLAVE_IS_OK(slave)) {
3792                         if (slave->speed != SPEED_UNKNOWN)
3793                                 speed += slave->speed;
3794                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
3795                             slave->duplex != DUPLEX_UNKNOWN)
3796                                 ecmd->duplex = slave->duplex;
3797                 }
3798         }
3799         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3800         read_unlock(&bond->lock);
3801
3802         return 0;
3803 }
3804
3805 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3806                                      struct ethtool_drvinfo *drvinfo)
3807 {
3808         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3809         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3810         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3811                  BOND_ABI_VERSION);
3812 }
3813
3814 static const struct ethtool_ops bond_ethtool_ops = {
3815         .get_drvinfo            = bond_ethtool_get_drvinfo,
3816         .get_settings           = bond_ethtool_get_settings,
3817         .get_link               = ethtool_op_get_link,
3818 };
3819
3820 static const struct net_device_ops bond_netdev_ops = {
3821         .ndo_init               = bond_init,
3822         .ndo_uninit             = bond_uninit,
3823         .ndo_open               = bond_open,
3824         .ndo_stop               = bond_close,
3825         .ndo_start_xmit         = bond_start_xmit,
3826         .ndo_select_queue       = bond_select_queue,
3827         .ndo_get_stats64        = bond_get_stats,
3828         .ndo_do_ioctl           = bond_do_ioctl,
3829         .ndo_change_rx_flags    = bond_change_rx_flags,
3830         .ndo_set_rx_mode        = bond_set_rx_mode,
3831         .ndo_change_mtu         = bond_change_mtu,
3832         .ndo_set_mac_address    = bond_set_mac_address,
3833         .ndo_neigh_setup        = bond_neigh_setup,
3834         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
3835         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
3836 #ifdef CONFIG_NET_POLL_CONTROLLER
3837         .ndo_netpoll_setup      = bond_netpoll_setup,
3838         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
3839         .ndo_poll_controller    = bond_poll_controller,
3840 #endif
3841         .ndo_add_slave          = bond_enslave,
3842         .ndo_del_slave          = bond_release,
3843         .ndo_fix_features       = bond_fix_features,
3844 };
3845
3846 static const struct device_type bond_type = {
3847         .name = "bond",
3848 };
3849
3850 static void bond_destructor(struct net_device *bond_dev)
3851 {
3852         struct bonding *bond = netdev_priv(bond_dev);
3853         if (bond->wq)
3854                 destroy_workqueue(bond->wq);
3855         free_netdev(bond_dev);
3856 }
3857
3858 void bond_setup(struct net_device *bond_dev)
3859 {
3860         struct bonding *bond = netdev_priv(bond_dev);
3861
3862         /* initialize rwlocks */
3863         rwlock_init(&bond->lock);
3864         rwlock_init(&bond->curr_slave_lock);
3865         bond->params = bonding_defaults;
3866
3867         /* Initialize pointers */
3868         bond->dev = bond_dev;
3869
3870         /* Initialize the device entry points */
3871         ether_setup(bond_dev);
3872         bond_dev->netdev_ops = &bond_netdev_ops;
3873         bond_dev->ethtool_ops = &bond_ethtool_ops;
3874
3875         bond_dev->destructor = bond_destructor;
3876
3877         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
3878
3879         /* Initialize the device options */
3880         bond_dev->tx_queue_len = 0;
3881         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
3882         bond_dev->priv_flags |= IFF_BONDING;
3883         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
3884
3885         /* At first, we block adding VLANs. That's the only way to
3886          * prevent problems that occur when adding VLANs over an
3887          * empty bond. The block will be removed once non-challenged
3888          * slaves are enslaved.
3889          */
3890         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
3891
3892         /* don't acquire bond device's netif_tx_lock when
3893          * transmitting */
3894         bond_dev->features |= NETIF_F_LLTX;
3895
3896         /* By default, we declare the bond to be fully
3897          * VLAN hardware accelerated capable. Special
3898          * care is taken in the various xmit functions
3899          * when there are slaves that are not hw accel
3900          * capable
3901          */
3902
3903         bond_dev->hw_features = BOND_VLAN_FEATURES |
3904                                 NETIF_F_HW_VLAN_CTAG_TX |
3905                                 NETIF_F_HW_VLAN_CTAG_RX |
3906                                 NETIF_F_HW_VLAN_CTAG_FILTER;
3907
3908         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
3909         bond_dev->features |= bond_dev->hw_features;
3910 }
3911
3912 /*
3913 * Destroy a bonding device.
3914 * Must be under rtnl_lock when this function is called.
3915 */
3916 static void bond_uninit(struct net_device *bond_dev)
3917 {
3918         struct bonding *bond = netdev_priv(bond_dev);
3919         struct list_head *iter;
3920         struct slave *slave;
3921
3922         bond_netpoll_cleanup(bond_dev);
3923
3924         /* Release the bonded slaves */
3925         bond_for_each_slave(bond, slave, iter)
3926                 __bond_release_one(bond_dev, slave->dev, true);
3927         pr_info("%s: released all slaves\n", bond_dev->name);
3928
3929         list_del(&bond->bond_list);
3930
3931         bond_debug_unregister(bond);
3932 }
3933
3934 /*------------------------- Module initialization ---------------------------*/
3935
3936 int bond_parm_tbl_lookup(int mode, const struct bond_parm_tbl *tbl)
3937 {
3938         int i;
3939
3940         for (i = 0; tbl[i].modename; i++)
3941                 if (mode == tbl[i].mode)
3942                         return tbl[i].mode;
3943
3944         return -1;
3945 }
3946
3947 static int bond_parm_tbl_lookup_name(const char *modename,
3948                                      const struct bond_parm_tbl *tbl)
3949 {
3950         int i;
3951
3952         for (i = 0; tbl[i].modename; i++)
3953                 if (strcmp(modename, tbl[i].modename) == 0)
3954                         return tbl[i].mode;
3955
3956         return -1;
3957 }
3958
3959 /*
3960  * Convert string input module parms.  Accept either the
3961  * number of the mode or its string name.  A bit complicated because
3962  * some mode names are substrings of other names, and calls from sysfs
3963  * may have whitespace in the name (trailing newlines, for example).
3964  */
3965 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
3966 {
3967         int modeint;
3968         char *p, modestr[BOND_MAX_MODENAME_LEN + 1];
3969
3970         for (p = (char *)buf; *p; p++)
3971                 if (!(isdigit(*p) || isspace(*p)))
3972                         break;
3973
3974         if (*p && sscanf(buf, "%20s", modestr) != 0)
3975                 return bond_parm_tbl_lookup_name(modestr, tbl);
3976         else if (sscanf(buf, "%d", &modeint) != 0)
3977                 return bond_parm_tbl_lookup(modeint, tbl);
3978
3979         return -1;
3980 }
3981
3982 static int bond_check_params(struct bond_params *params)
3983 {
3984         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
3985         int arp_all_targets_value;
3986
3987         /*
3988          * Convert string parameters.
3989          */
3990         if (mode) {
3991                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
3992                 if (bond_mode == -1) {
3993                         pr_err("Error: Invalid bonding mode \"%s\"\n",
3994                                mode == NULL ? "NULL" : mode);
3995                         return -EINVAL;
3996                 }
3997         }
3998
3999         if (xmit_hash_policy) {
4000                 if ((bond_mode != BOND_MODE_XOR) &&
4001                     (bond_mode != BOND_MODE_8023AD)) {
4002                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4003                                bond_mode_name(bond_mode));
4004                 } else {
4005                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4006                                                         xmit_hashtype_tbl);
4007                         if (xmit_hashtype == -1) {
4008                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4009                                        xmit_hash_policy == NULL ? "NULL" :
4010                                        xmit_hash_policy);
4011                                 return -EINVAL;
4012                         }
4013                 }
4014         }
4015
4016         if (lacp_rate) {
4017                 if (bond_mode != BOND_MODE_8023AD) {
4018                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4019                                 bond_mode_name(bond_mode));
4020                 } else {
4021                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4022                         if (lacp_fast == -1) {
4023                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4024                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4025                                 return -EINVAL;
4026                         }
4027                 }
4028         }
4029
4030         if (ad_select) {
4031                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4032                 if (params->ad_select == -1) {
4033                         pr_err("Error: Invalid ad_select \"%s\"\n",
4034                                ad_select == NULL ? "NULL" : ad_select);
4035                         return -EINVAL;
4036                 }
4037
4038                 if (bond_mode != BOND_MODE_8023AD) {
4039                         pr_warning("ad_select param only affects 802.3ad mode\n");
4040                 }
4041         } else {
4042                 params->ad_select = BOND_AD_STABLE;
4043         }
4044
4045         if (max_bonds < 0) {
4046                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4047                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4048                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4049         }
4050
4051         if (miimon < 0) {
4052                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4053                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4054                 miimon = BOND_LINK_MON_INTERV;
4055         }
4056
4057         if (updelay < 0) {
4058                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4059                            updelay, INT_MAX);
4060                 updelay = 0;
4061         }
4062
4063         if (downdelay < 0) {
4064                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4065                            downdelay, INT_MAX);
4066                 downdelay = 0;
4067         }
4068
4069         if ((use_carrier != 0) && (use_carrier != 1)) {
4070                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4071                            use_carrier);
4072                 use_carrier = 1;
4073         }
4074
4075         if (num_peer_notif < 0 || num_peer_notif > 255) {
4076                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4077                            num_peer_notif);
4078                 num_peer_notif = 1;
4079         }
4080
4081         /* reset values for 802.3ad/TLB/ALB */
4082         if (BOND_NO_USES_ARP(bond_mode)) {
4083                 if (!miimon) {
4084                         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");
4085                         pr_warning("Forcing miimon to 100msec\n");
4086                         miimon = BOND_DEFAULT_MIIMON;
4087                 }
4088         }
4089
4090         if (tx_queues < 1 || tx_queues > 255) {
4091                 pr_warning("Warning: tx_queues (%d) should be between "
4092                            "1 and 255, resetting to %d\n",
4093                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4094                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4095         }
4096
4097         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4098                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4099                            "not of valid value (0/1), so it was set to "
4100                            "0\n", all_slaves_active);
4101                 all_slaves_active = 0;
4102         }
4103
4104         if (resend_igmp < 0 || resend_igmp > 255) {
4105                 pr_warning("Warning: resend_igmp (%d) should be between "
4106                            "0 and 255, resetting to %d\n",
4107                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4108                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4109         }
4110
4111         if (packets_per_slave < 0 || packets_per_slave > USHRT_MAX) {
4112                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4113                         packets_per_slave, USHRT_MAX);
4114                 packets_per_slave = 1;
4115         }
4116
4117         if (bond_mode == BOND_MODE_ALB) {
4118                 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",
4119                           updelay);
4120         }
4121
4122         if (!miimon) {
4123                 if (updelay || downdelay) {
4124                         /* just warn the user the up/down delay will have
4125                          * no effect since miimon is zero...
4126                          */
4127                         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",
4128                                    updelay, downdelay);
4129                 }
4130         } else {
4131                 /* don't allow arp monitoring */
4132                 if (arp_interval) {
4133                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4134                                    miimon, arp_interval);
4135                         arp_interval = 0;
4136                 }
4137
4138                 if ((updelay % miimon) != 0) {
4139                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4140                                    updelay, miimon,
4141                                    (updelay / miimon) * miimon);
4142                 }
4143
4144                 updelay /= miimon;
4145
4146                 if ((downdelay % miimon) != 0) {
4147                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4148                                    downdelay, miimon,
4149                                    (downdelay / miimon) * miimon);
4150                 }
4151
4152                 downdelay /= miimon;
4153         }
4154
4155         if (arp_interval < 0) {
4156                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4157                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4158                 arp_interval = BOND_LINK_ARP_INTERV;
4159         }
4160
4161         for (arp_ip_count = 0, i = 0;
4162              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4163                 /* not complete check, but should be good enough to
4164                    catch mistakes */
4165                 __be32 ip;
4166                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4167                     IS_IP_TARGET_UNUSABLE_ADDRESS(ip)) {
4168                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4169                                    arp_ip_target[i]);
4170                         arp_interval = 0;
4171                 } else {
4172                         if (bond_get_targets_ip(arp_target, ip) == -1)
4173                                 arp_target[arp_ip_count++] = ip;
4174                         else
4175                                 pr_warning("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4176                                            &ip);
4177                 }
4178         }
4179
4180         if (arp_interval && !arp_ip_count) {
4181                 /* don't allow arping if no arp_ip_target given... */
4182                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4183                            arp_interval);
4184                 arp_interval = 0;
4185         }
4186
4187         if (arp_validate) {
4188                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4189                         pr_err("arp_validate only supported in active-backup mode\n");
4190                         return -EINVAL;
4191                 }
4192                 if (!arp_interval) {
4193                         pr_err("arp_validate requires arp_interval\n");
4194                         return -EINVAL;
4195                 }
4196
4197                 arp_validate_value = bond_parse_parm(arp_validate,
4198                                                      arp_validate_tbl);
4199                 if (arp_validate_value == -1) {
4200                         pr_err("Error: invalid arp_validate \"%s\"\n",
4201                                arp_validate == NULL ? "NULL" : arp_validate);
4202                         return -EINVAL;
4203                 }
4204         } else
4205                 arp_validate_value = 0;
4206
4207         arp_all_targets_value = 0;
4208         if (arp_all_targets) {
4209                 arp_all_targets_value = bond_parse_parm(arp_all_targets,
4210                                                         arp_all_targets_tbl);
4211
4212                 if (arp_all_targets_value == -1) {
4213                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4214                                arp_all_targets);
4215                         arp_all_targets_value = 0;
4216                 }
4217         }
4218
4219         if (miimon) {
4220                 pr_info("MII link monitoring set to %d ms\n", miimon);
4221         } else if (arp_interval) {
4222                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4223                         arp_interval,
4224                         arp_validate_tbl[arp_validate_value].modename,
4225                         arp_ip_count);
4226
4227                 for (i = 0; i < arp_ip_count; i++)
4228                         pr_info(" %s", arp_ip_target[i]);
4229
4230                 pr_info("\n");
4231
4232         } else if (max_bonds) {
4233                 /* miimon and arp_interval not set, we need one so things
4234                  * work as expected, see bonding.txt for details
4235                  */
4236                 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");
4237         }
4238
4239         if (primary && !USES_PRIMARY(bond_mode)) {
4240                 /* currently, using a primary only makes sense
4241                  * in active backup, TLB or ALB modes
4242                  */
4243                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4244                            primary, bond_mode_name(bond_mode));
4245                 primary = NULL;
4246         }
4247
4248         if (primary && primary_reselect) {
4249                 primary_reselect_value = bond_parse_parm(primary_reselect,
4250                                                          pri_reselect_tbl);
4251                 if (primary_reselect_value == -1) {
4252                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4253                                primary_reselect ==
4254                                         NULL ? "NULL" : primary_reselect);
4255                         return -EINVAL;
4256                 }
4257         } else {
4258                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4259         }
4260
4261         if (fail_over_mac) {
4262                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4263                                                       fail_over_mac_tbl);
4264                 if (fail_over_mac_value == -1) {
4265                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4266                                arp_validate == NULL ? "NULL" : arp_validate);
4267                         return -EINVAL;
4268                 }
4269
4270                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4271                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4272         } else {
4273                 fail_over_mac_value = BOND_FOM_NONE;
4274         }
4275
4276         if (lp_interval == 0) {
4277                 pr_warning("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4278                            INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4279                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4280         }
4281
4282         /* fill params struct with the proper values */
4283         params->mode = bond_mode;
4284         params->xmit_policy = xmit_hashtype;
4285         params->miimon = miimon;
4286         params->num_peer_notif = num_peer_notif;
4287         params->arp_interval = arp_interval;
4288         params->arp_validate = arp_validate_value;
4289         params->arp_all_targets = arp_all_targets_value;
4290         params->updelay = updelay;
4291         params->downdelay = downdelay;
4292         params->use_carrier = use_carrier;
4293         params->lacp_fast = lacp_fast;
4294         params->primary[0] = 0;
4295         params->primary_reselect = primary_reselect_value;
4296         params->fail_over_mac = fail_over_mac_value;
4297         params->tx_queues = tx_queues;
4298         params->all_slaves_active = all_slaves_active;
4299         params->resend_igmp = resend_igmp;
4300         params->min_links = min_links;
4301         params->lp_interval = lp_interval;
4302         if (packets_per_slave > 1)
4303                 params->packets_per_slave = reciprocal_value(packets_per_slave);
4304         else
4305                 params->packets_per_slave = packets_per_slave;
4306         if (primary) {
4307                 strncpy(params->primary, primary, IFNAMSIZ);
4308                 params->primary[IFNAMSIZ - 1] = 0;
4309         }
4310
4311         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4312
4313         return 0;
4314 }
4315
4316 static struct lock_class_key bonding_netdev_xmit_lock_key;
4317 static struct lock_class_key bonding_netdev_addr_lock_key;
4318 static struct lock_class_key bonding_tx_busylock_key;
4319
4320 static void bond_set_lockdep_class_one(struct net_device *dev,
4321                                        struct netdev_queue *txq,
4322                                        void *_unused)
4323 {
4324         lockdep_set_class(&txq->_xmit_lock,
4325                           &bonding_netdev_xmit_lock_key);
4326 }
4327
4328 static void bond_set_lockdep_class(struct net_device *dev)
4329 {
4330         lockdep_set_class(&dev->addr_list_lock,
4331                           &bonding_netdev_addr_lock_key);
4332         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4333         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4334 }
4335
4336 /*
4337  * Called from registration process
4338  */
4339 static int bond_init(struct net_device *bond_dev)
4340 {
4341         struct bonding *bond = netdev_priv(bond_dev);
4342         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4343         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4344
4345         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4346
4347         /*
4348          * Initialize locks that may be required during
4349          * en/deslave operations.  All of the bond_open work
4350          * (of which this is part) should really be moved to
4351          * a phase prior to dev_open
4352          */
4353         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4354         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4355
4356         bond->wq = create_singlethread_workqueue(bond_dev->name);
4357         if (!bond->wq)
4358                 return -ENOMEM;
4359
4360         bond_set_lockdep_class(bond_dev);
4361
4362         list_add_tail(&bond->bond_list, &bn->dev_list);
4363
4364         bond_prepare_sysfs_group(bond);
4365
4366         bond_debug_register(bond);
4367
4368         /* Ensure valid dev_addr */
4369         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4370             bond_dev->addr_assign_type == NET_ADDR_PERM)
4371                 eth_hw_addr_random(bond_dev);
4372
4373         return 0;
4374 }
4375
4376 unsigned int bond_get_num_tx_queues(void)
4377 {
4378         return tx_queues;
4379 }
4380
4381 /* Create a new bond based on the specified name and bonding parameters.
4382  * If name is NULL, obtain a suitable "bond%d" name for us.
4383  * Caller must NOT hold rtnl_lock; we need to release it here before we
4384  * set up our sysfs entries.
4385  */
4386 int bond_create(struct net *net, const char *name)
4387 {
4388         struct net_device *bond_dev;
4389         int res;
4390
4391         rtnl_lock();
4392
4393         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4394                                    name ? name : "bond%d",
4395                                    bond_setup, tx_queues);
4396         if (!bond_dev) {
4397                 pr_err("%s: eek! can't alloc netdev!\n", name);
4398                 rtnl_unlock();
4399                 return -ENOMEM;
4400         }
4401
4402         dev_net_set(bond_dev, net);
4403         bond_dev->rtnl_link_ops = &bond_link_ops;
4404
4405         res = register_netdevice(bond_dev);
4406
4407         netif_carrier_off(bond_dev);
4408
4409         rtnl_unlock();
4410         if (res < 0)
4411                 bond_destructor(bond_dev);
4412         return res;
4413 }
4414
4415 static int __net_init bond_net_init(struct net *net)
4416 {
4417         struct bond_net *bn = net_generic(net, bond_net_id);
4418
4419         bn->net = net;
4420         INIT_LIST_HEAD(&bn->dev_list);
4421
4422         bond_create_proc_dir(bn);
4423         bond_create_sysfs(bn);
4424
4425         return 0;
4426 }
4427
4428 static void __net_exit bond_net_exit(struct net *net)
4429 {
4430         struct bond_net *bn = net_generic(net, bond_net_id);
4431         struct bonding *bond, *tmp_bond;
4432         LIST_HEAD(list);
4433
4434         bond_destroy_sysfs(bn);
4435         bond_destroy_proc_dir(bn);
4436
4437         /* Kill off any bonds created after unregistering bond rtnl ops */
4438         rtnl_lock();
4439         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4440                 unregister_netdevice_queue(bond->dev, &list);
4441         unregister_netdevice_many(&list);
4442         rtnl_unlock();
4443 }
4444
4445 static struct pernet_operations bond_net_ops = {
4446         .init = bond_net_init,
4447         .exit = bond_net_exit,
4448         .id   = &bond_net_id,
4449         .size = sizeof(struct bond_net),
4450 };
4451
4452 static int __init bonding_init(void)
4453 {
4454         int i;
4455         int res;
4456
4457         pr_info("%s", bond_version);
4458
4459         res = bond_check_params(&bonding_defaults);
4460         if (res)
4461                 goto out;
4462
4463         res = register_pernet_subsys(&bond_net_ops);
4464         if (res)
4465                 goto out;
4466
4467         res = bond_netlink_init();
4468         if (res)
4469                 goto err_link;
4470
4471         bond_create_debugfs();
4472
4473         for (i = 0; i < max_bonds; i++) {
4474                 res = bond_create(&init_net, NULL);
4475                 if (res)
4476                         goto err;
4477         }
4478
4479         register_netdevice_notifier(&bond_netdev_notifier);
4480 out:
4481         return res;
4482 err:
4483         bond_netlink_fini();
4484 err_link:
4485         unregister_pernet_subsys(&bond_net_ops);
4486         goto out;
4487
4488 }
4489
4490 static void __exit bonding_exit(void)
4491 {
4492         unregister_netdevice_notifier(&bond_netdev_notifier);
4493
4494         bond_destroy_debugfs();
4495
4496         bond_netlink_fini();
4497         unregister_pernet_subsys(&bond_net_ops);
4498
4499 #ifdef CONFIG_NET_POLL_CONTROLLER
4500         /*
4501          * Make sure we don't have an imbalance on our netpoll blocking
4502          */
4503         WARN_ON(atomic_read(&netpoll_block_tx));
4504 #endif
4505 }
4506
4507 module_init(bonding_init);
4508 module_exit(bonding_exit);
4509 MODULE_LICENSE("GPL");
4510 MODULE_VERSION(DRV_VERSION);
4511 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4512 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");