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 "bonding.h"
  83 #include "bond_3ad.h"
  84 #include "bond_alb.h"
  85
  86 /*---------------------------- Module parameters ----------------------------*/
  87
  88 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  89
  90 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  91 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  92 static int num_peer_notif = 1;
  93 static int miimon;
  94 static int updelay;
  95 static int downdelay;
  96 static int use_carrier  = 1;
  97 static char *mode;
  98 static char *primary;
  99 static char *primary_reselect;
 100 static char *lacp_rate;
 101 static int min_links;
 102 static char *ad_select;
 103 static char *xmit_hash_policy;
 104 static int arp_interval;
 105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 106 static char *arp_validate;
 107 static char *arp_all_targets;
 108 static char *fail_over_mac;
 109 static int all_slaves_active;
 110 static struct bond_params bonding_defaults;
 111 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 112 static int packets_per_slave = 1;
 113 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 114
 115 module_param(max_bonds, int, 0);
 116 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 117 module_param(tx_queues, int, 0);
 118 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 119 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 120 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 121                                "failover event (alias of num_unsol_na)");
 122 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 123 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 124                                "failover event (alias of num_grat_arp)");
 125 module_param(miimon, int, 0);
 126 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 127 module_param(updelay, int, 0);
 128 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 129 module_param(downdelay, int, 0);
 130 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 131                             "in milliseconds");
 132 module_param(use_carrier, int, 0);
 133 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 134                               "0 for off, 1 for on (default)");
 135 module_param(mode, charp, 0);
 136 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 137                        "1 for active-backup, 2 for balance-xor, "
 138                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 139                        "6 for balance-alb");
 140 module_param(primary, charp, 0);
 141 MODULE_PARM_DESC(primary, "Primary network device to use");
 142 module_param(primary_reselect, charp, 0);
 143 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 144                                    "once it comes up; "
 145                                    "0 for always (default), "
 146                                    "1 for only if speed of primary is "
 147                                    "better, "
 148                                    "2 for only on active slave "
 149                                    "failure");
 150 module_param(lacp_rate, charp, 0);
 151 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 152                             "0 for slow, 1 for fast");
 153 module_param(ad_select, charp, 0);
 154 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
 155                             "0 for stable (default), 1 for bandwidth, "
 156                             "2 for count");
 157 module_param(min_links, int, 0);
 158 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 159
 160 module_param(xmit_hash_policy, charp, 0);
 161 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 162                                    "0 for layer 2 (default), 1 for layer 3+4, "
 163                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 164                                    "4 for encap layer 3+4");
 165 module_param(arp_interval, int, 0);
 166 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 167 module_param_array(arp_ip_target, charp, NULL, 0);
 168 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 169 module_param(arp_validate, charp, 0);
 170 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 171                                "0 for none (default), 1 for active, "
 172                                "2 for backup, 3 for all");
 173 module_param(arp_all_targets, charp, 0);
 174 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 175 module_param(fail_over_mac, charp, 0);
 176 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 177                                 "the same MAC; 0 for none (default), "
 178                                 "1 for active, 2 for follow");
 179 module_param(all_slaves_active, int, 0);
 180 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 181                                      "by setting active flag for all slaves; "
 182                                      "0 for never (default), 1 for always.");
 183 module_param(resend_igmp, int, 0);
 184 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 185                               "link failure");
 186 module_param(packets_per_slave, int, 0);
 187 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 188                                     "mode; 0 for a random slave, 1 packet per "
 189                                     "slave (default), >1 packets per slave.");
 190 module_param(lp_interval, uint, 0);
 191 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 192                               "the bonding driver sends learning packets to "
 193                               "each slaves peer switch. The default is 1.");
 194
 195 /*----------------------------- Global variables ----------------------------*/
 196
 197 #ifdef CONFIG_NET_POLL_CONTROLLER
 198 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 199 #endif
 200
 201 int bond_net_id __read_mostly;
 202
 203 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 204 static int arp_ip_count;
 205 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 206 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 207 static int lacp_fast;
 208
 209 /*-------------------------- Forward declarations ---------------------------*/
 210
 211 static int bond_init(struct net_device *bond_dev);
 212 static void bond_uninit(struct net_device *bond_dev);
 213
 214 /*---------------------------- General routines -----------------------------*/
 215
 216 const char *bond_mode_name(int mode)
 217 {
 218         static const char *names[] = {
 219                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 220                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 221                 [BOND_MODE_XOR] = "load balancing (xor)",
 222                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 223                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 224                 [BOND_MODE_TLB] = "transmit load balancing",
 225                 [BOND_MODE_ALB] = "adaptive load balancing",
 226         };
 227
 228         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 229                 return "unknown";
 230
 231         return names[mode];
 232 }
 233
 234 /*---------------------------------- VLAN -----------------------------------*/
 235
 236 /**
 237  * bond_dev_queue_xmit - Prepare skb for xmit.
 238  *
 239  * @bond: bond device that got this skb for tx.
 240  * @skb: hw accel VLAN tagged skb to transmit
 241  * @slave_dev: slave that is supposed to xmit this skbuff
 242  */
 243 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 244                         struct net_device *slave_dev)
 245 {
 246         skb->dev = slave_dev;
 247
 248         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 249                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 250         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
 251
 252         if (unlikely(netpoll_tx_running(bond->dev)))
 253                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 254         else
 255                 dev_queue_xmit(skb);
 256 }
 257
 258 /*
 259  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 260  * We don't protect the slave list iteration with a lock because:
 261  * a. This operation is performed in IOCTL context,
 262  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 263  * c. Holding a lock with BH disabled while directly calling a base driver
 264  *    entry point is generally a BAD idea.
 265  *
 266  * The design of synchronization/protection for this operation in the 8021q
 267  * module is good for one or more VLAN devices over a single physical device
 268  * and cannot be extended for a teaming solution like bonding, so there is a
 269  * potential race condition here where a net device from the vlan group might
 270  * be referenced (either by a base driver or the 8021q code) while it is being
 271  * removed from the system. However, it turns out we're not making matters
 272  * worse, and if it works for regular VLAN usage it will work here too.
 273 */
 274
 275 /**
 276  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 277  * @bond_dev: bonding net device that got called
 278  * @vid: vlan id being added
 279  */
 280 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 281                                 __be16 proto, u16 vid)
 282 {
 283         struct bonding *bond = netdev_priv(bond_dev);
 284         struct slave *slave, *rollback_slave;
 285         struct list_head *iter;
 286         int res;
 287
 288         bond_for_each_slave(bond, slave, iter) {
 289                 res = vlan_vid_add(slave->dev, proto, vid);
 290                 if (res)
 291                         goto unwind;
 292         }
 293
 294         return 0;
 295
 296 unwind:
 297         /* unwind to the slave that failed */
 298         bond_for_each_slave(bond, rollback_slave, iter) {
 299                 if (rollback_slave == slave)
 300                         break;
 301
 302                 vlan_vid_del(rollback_slave->dev, proto, vid);
 303         }
 304
 305         return res;
 306 }
 307
 308 /**
 309  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 310  * @bond_dev: bonding net device that got called
 311  * @vid: vlan id being removed
 312  */
 313 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 314                                  __be16 proto, u16 vid)
 315 {
 316         struct bonding *bond = netdev_priv(bond_dev);
 317         struct list_head *iter;
 318         struct slave *slave;
 319
 320         bond_for_each_slave(bond, slave, iter)
 321                 vlan_vid_del(slave->dev, proto, vid);
 322
 323         if (bond_is_lb(bond))
 324                 bond_alb_clear_vlan(bond, vid);
 325
 326         return 0;
 327 }
 328
 329 /*------------------------------- Link status -------------------------------*/
 330
 331 /*
 332  * Set the carrier state for the master according to the state of its
 333  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 334  * do special 802.3ad magic.
 335  *
 336  * Returns zero if carrier state does not change, nonzero if it does.
 337  */
 338 static int bond_set_carrier(struct bonding *bond)
 339 {
 340         struct list_head *iter;
 341         struct slave *slave;
 342
 343         if (!bond_has_slaves(bond))
 344                 goto down;
 345
 346         if (bond->params.mode == BOND_MODE_8023AD)
 347                 return bond_3ad_set_carrier(bond);
 348
 349         bond_for_each_slave(bond, slave, iter) {
 350                 if (slave->link == BOND_LINK_UP) {
 351                         if (!netif_carrier_ok(bond->dev)) {
 352                                 netif_carrier_on(bond->dev);
 353                                 return 1;
 354                         }
 355                         return 0;
 356                 }
 357         }
 358
 359 down:
 360         if (netif_carrier_ok(bond->dev)) {
 361                 netif_carrier_off(bond->dev);
 362                 return 1;
 363         }
 364         return 0;
 365 }
 366
 367 /*
 368  * Get link speed and duplex from the slave's base driver
 369  * using ethtool. If for some reason the call fails or the
 370  * values are invalid, set speed and duplex to -1,
 371  * and return.
 372  */
 373 static void bond_update_speed_duplex(struct slave *slave)
 374 {
 375         struct net_device *slave_dev = slave->dev;
 376         struct ethtool_cmd ecmd;
 377         u32 slave_speed;
 378         int res;
 379
 380         slave->speed = SPEED_UNKNOWN;
 381         slave->duplex = DUPLEX_UNKNOWN;
 382
 383         res = __ethtool_get_settings(slave_dev, &ecmd);
 384         if (res < 0)
 385                 return;
 386
 387         slave_speed = ethtool_cmd_speed(&ecmd);
 388         if (slave_speed == 0 || slave_speed == ((__u32) -1))
 389                 return;
 390
 391         switch (ecmd.duplex) {
 392         case DUPLEX_FULL:
 393         case DUPLEX_HALF:
 394                 break;
 395         default:
 396                 return;
 397         }
 398
 399         slave->speed = slave_speed;
 400         slave->duplex = ecmd.duplex;
 401
 402         return;
 403 }
 404
 405 const char *bond_slave_link_status(s8 link)
 406 {
 407         switch (link) {
 408         case BOND_LINK_UP:
 409                 return "up";
 410         case BOND_LINK_FAIL:
 411                 return "going down";
 412         case BOND_LINK_DOWN:
 413                 return "down";
 414         case BOND_LINK_BACK:
 415                 return "going back";
 416         default:
 417                 return "unknown";
 418         }
 419 }
 420
 421 /*
 422  * if <dev> supports MII link status reporting, check its link status.
 423  *
 424  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 425  * depending upon the setting of the use_carrier parameter.
 426  *
 427  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 428  * can't tell and just pretend it is), or 0, meaning that the link is
 429  * down.
 430  *
 431  * If reporting is non-zero, instead of faking link up, return -1 if
 432  * both ETHTOOL and MII ioctls fail (meaning the device does not
 433  * support them).  If use_carrier is set, return whatever it says.
 434  * It'd be nice if there was a good way to tell if a driver supports
 435  * netif_carrier, but there really isn't.
 436  */
 437 static int bond_check_dev_link(struct bonding *bond,
 438                                struct net_device *slave_dev, int reporting)
 439 {
 440         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 441         int (*ioctl)(struct net_device *, struct ifreq *, int);
 442         struct ifreq ifr;
 443         struct mii_ioctl_data *mii;
 444
 445         if (!reporting && !netif_running(slave_dev))
 446                 return 0;
 447
 448         if (bond->params.use_carrier)
 449                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 450
 451         /* Try to get link status using Ethtool first. */
 452         if (slave_dev->ethtool_ops->get_link)
 453                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 454                         BMSR_LSTATUS : 0;
 455
 456         /* Ethtool can't be used, fallback to MII ioctls. */
 457         ioctl = slave_ops->ndo_do_ioctl;
 458         if (ioctl) {
 459                 /* TODO: set pointer to correct ioctl on a per team member */
 460                 /*       bases to make this more efficient. that is, once  */
 461                 /*       we determine the correct ioctl, we will always    */
 462                 /*       call it and not the others for that team          */
 463                 /*       member.                                           */
 464
 465                 /*
 466                  * We cannot assume that SIOCGMIIPHY will also read a
 467                  * register; not all network drivers (e.g., e100)
 468                  * support that.
 469                  */
 470
 471                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 472                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 473                 mii = if_mii(&ifr);
 474                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 475                         mii->reg_num = MII_BMSR;
 476                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 477                                 return mii->val_out & BMSR_LSTATUS;
 478                 }
 479         }
 480
 481         /*
 482          * If reporting, report that either there's no dev->do_ioctl,
 483          * or both SIOCGMIIREG and get_link failed (meaning that we
 484          * cannot report link status).  If not reporting, pretend
 485          * we're ok.
 486          */
 487         return reporting ? -1 : BMSR_LSTATUS;
 488 }
 489
 490 /*----------------------------- Multicast list ------------------------------*/
 491
 492 /*
 493  * Push the promiscuity flag down to appropriate slaves
 494  */
 495 static int bond_set_promiscuity(struct bonding *bond, int inc)
 496 {
 497         struct list_head *iter;
 498         int err = 0;
 499
 500         if (USES_PRIMARY(bond->params.mode)) {
 501                 /* write lock already acquired */
 502                 if (bond->curr_active_slave) {
 503                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 504                                                   inc);
 505                 }
 506         } else {
 507                 struct slave *slave;
 508
 509                 bond_for_each_slave(bond, slave, iter) {
 510                         err = dev_set_promiscuity(slave->dev, inc);
 511                         if (err)
 512                                 return err;
 513                 }
 514         }
 515         return err;
 516 }
 517
 518 /*
 519  * Push the allmulti flag down to all slaves
 520  */
 521 static int bond_set_allmulti(struct bonding *bond, int inc)
 522 {
 523         struct list_head *iter;
 524         int err = 0;
 525
 526         if (USES_PRIMARY(bond->params.mode)) {
 527                 /* write lock already acquired */
 528                 if (bond->curr_active_slave) {
 529                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 530                                                inc);
 531                 }
 532         } else {
 533                 struct slave *slave;
 534
 535                 bond_for_each_slave(bond, slave, iter) {
 536                         err = dev_set_allmulti(slave->dev, inc);
 537                         if (err)
 538                                 return err;
 539                 }
 540         }
 541         return err;
 542 }
 543
 544 /*
 545  * Retrieve the list of registered multicast addresses for the bonding
 546  * device and retransmit an IGMP JOIN request to the current active
 547  * slave.
 548  */
 549 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 550 {
 551         struct bonding *bond = container_of(work, struct bonding,
 552                                             mcast_work.work);
 553
 554         if (!rtnl_trylock()) {
 555                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 556                 return;
 557         }
 558         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 559
 560         if (bond->igmp_retrans > 1) {
 561                 bond->igmp_retrans--;
 562                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 563         }
 564         rtnl_unlock();
 565 }
 566
 567 /* Flush bond's hardware addresses from slave
 568  */
 569 static void bond_hw_addr_flush(struct net_device *bond_dev,
 570                                struct net_device *slave_dev)
 571 {
 572         struct bonding *bond = netdev_priv(bond_dev);
 573
 574         dev_uc_unsync(slave_dev, bond_dev);
 575         dev_mc_unsync(slave_dev, bond_dev);
 576
 577         if (bond->params.mode == BOND_MODE_8023AD) {
 578                 /* del lacpdu mc addr from mc list */
 579                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 580
 581                 dev_mc_del(slave_dev, lacpdu_multicast);
 582         }
 583 }
 584
 585 /*--------------------------- Active slave change ---------------------------*/
 586
 587 /* Update the hardware address list and promisc/allmulti for the new and
 588  * old active slaves (if any).  Modes that are !USES_PRIMARY keep all
 589  * slaves up date at all times; only the USES_PRIMARY modes need to call
 590  * this function to swap these settings during a failover.
 591  */
 592 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 593                               struct slave *old_active)
 594 {
 595         ASSERT_RTNL();
 596
 597         if (old_active) {
 598                 if (bond->dev->flags & IFF_PROMISC)
 599                         dev_set_promiscuity(old_active->dev, -1);
 600
 601                 if (bond->dev->flags & IFF_ALLMULTI)
 602                         dev_set_allmulti(old_active->dev, -1);
 603
 604                 bond_hw_addr_flush(bond->dev, old_active->dev);
 605         }
 606
 607         if (new_active) {
 608                 /* FIXME: Signal errors upstream. */
 609                 if (bond->dev->flags & IFF_PROMISC)
 610                         dev_set_promiscuity(new_active->dev, 1);
 611
 612                 if (bond->dev->flags & IFF_ALLMULTI)
 613                         dev_set_allmulti(new_active->dev, 1);
 614
 615                 netif_addr_lock_bh(bond->dev);
 616                 dev_uc_sync(new_active->dev, bond->dev);
 617                 dev_mc_sync(new_active->dev, bond->dev);
 618                 netif_addr_unlock_bh(bond->dev);
 619         }
 620 }
 621
 622 /**
 623  * bond_set_dev_addr - clone slave's address to bond
 624  * @bond_dev: bond net device
 625  * @slave_dev: slave net device
 626  *
 627  * Should be called with RTNL held.
 628  */
 629 static void bond_set_dev_addr(struct net_device *bond_dev,
 630                               struct net_device *slave_dev)
 631 {
 632         pr_debug("bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 633                  bond_dev, slave_dev, slave_dev->addr_len);
 634         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 635         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 636         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 637 }
 638
 639 /*
 640  * bond_do_fail_over_mac
 641  *
 642  * Perform special MAC address swapping for fail_over_mac settings
 643  *
 644  * Called with RTNL, curr_slave_lock for write_bh.
 645  */
 646 static void bond_do_fail_over_mac(struct bonding *bond,
 647                                   struct slave *new_active,
 648                                   struct slave *old_active)
 649         __releases(&bond->curr_slave_lock)
 650         __acquires(&bond->curr_slave_lock)
 651 {
 652         u8 tmp_mac[ETH_ALEN];
 653         struct sockaddr saddr;
 654         int rv;
 655
 656         switch (bond->params.fail_over_mac) {
 657         case BOND_FOM_ACTIVE:
 658                 if (new_active) {
 659                         write_unlock_bh(&bond->curr_slave_lock);
 660                         bond_set_dev_addr(bond->dev, new_active->dev);
 661                         write_lock_bh(&bond->curr_slave_lock);
 662                 }
 663                 break;
 664         case BOND_FOM_FOLLOW:
 665                 /*
 666                  * if new_active && old_active, swap them
 667                  * if just old_active, do nothing (going to no active slave)
 668                  * if just new_active, set new_active to bond's MAC
 669                  */
 670                 if (!new_active)
 671                         return;
 672
 673                 write_unlock_bh(&bond->curr_slave_lock);
 674
 675                 if (old_active) {
 676                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
 677                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
 678                                ETH_ALEN);
 679                         saddr.sa_family = new_active->dev->type;
 680                 } else {
 681                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
 682                         saddr.sa_family = bond->dev->type;
 683                 }
 684
 685                 rv = dev_set_mac_address(new_active->dev, &saddr);
 686                 if (rv) {
 687                         pr_err("%s: Error %d setting MAC of slave %s\n",
 688                                bond->dev->name, -rv, new_active->dev->name);
 689                         goto out;
 690                 }
 691
 692                 if (!old_active)
 693                         goto out;
 694
 695                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
 696                 saddr.sa_family = old_active->dev->type;
 697
 698                 rv = dev_set_mac_address(old_active->dev, &saddr);
 699                 if (rv)
 700                         pr_err("%s: Error %d setting MAC of slave %s\n",
 701                                bond->dev->name, -rv, new_active->dev->name);
 702 out:
 703                 write_lock_bh(&bond->curr_slave_lock);
 704                 break;
 705         default:
 706                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
 707                        bond->dev->name, bond->params.fail_over_mac);
 708                 break;
 709         }
 710
 711 }
 712
 713 static bool bond_should_change_active(struct bonding *bond)
 714 {
 715         struct slave *prim = bond->primary_slave;
 716         struct slave *curr = bond->curr_active_slave;
 717
 718         if (!prim || !curr || curr->link != BOND_LINK_UP)
 719                 return true;
 720         if (bond->force_primary) {
 721                 bond->force_primary = false;
 722                 return true;
 723         }
 724         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
 725             (prim->speed < curr->speed ||
 726              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
 727                 return false;
 728         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
 729                 return false;
 730         return true;
 731 }
 732
 733 /**
 734  * find_best_interface - select the best available slave to be the active one
 735  * @bond: our bonding struct
 736  */
 737 static struct slave *bond_find_best_slave(struct bonding *bond)
 738 {
 739         struct slave *slave, *bestslave = NULL;
 740         struct list_head *iter;
 741         int mintime = bond->params.updelay;
 742
 743         if (bond->primary_slave && bond->primary_slave->link == BOND_LINK_UP &&
 744             bond_should_change_active(bond))
 745                 return bond->primary_slave;
 746
 747         bond_for_each_slave(bond, slave, iter) {
 748                 if (slave->link == BOND_LINK_UP)
 749                         return slave;
 750                 if (slave->link == BOND_LINK_BACK && IS_UP(slave->dev) &&
 751                     slave->delay < mintime) {
 752                         mintime = slave->delay;
 753                         bestslave = slave;
 754                 }
 755         }
 756
 757         return bestslave;
 758 }
 759
 760 static bool bond_should_notify_peers(struct bonding *bond)
 761 {
 762         struct slave *slave;
 763
 764         rcu_read_lock();
 765         slave = rcu_dereference(bond->curr_active_slave);
 766         rcu_read_unlock();
 767
 768         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
 769                  bond->dev->name, slave ? slave->dev->name : "NULL");
 770
 771         if (!slave || !bond->send_peer_notif ||
 772             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 773                 return false;
 774
 775         return true;
 776 }
 777
 778 /**
 779  * change_active_interface - change the active slave into the specified one
 780  * @bond: our bonding struct
 781  * @new: the new slave to make the active one
 782  *
 783  * Set the new slave to the bond's settings and unset them on the old
 784  * curr_active_slave.
 785  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 786  *
 787  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 788  * because it is apparently the best available slave we have, even though its
 789  * updelay hasn't timed out yet.
 790  *
 791  * If new_active is not NULL, caller must hold curr_slave_lock for write_bh.
 792  */
 793 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 794 {
 795         struct slave *old_active = bond->curr_active_slave;
 796
 797         if (old_active == new_active)
 798                 return;
 799
 800         if (new_active) {
 801                 new_active->jiffies = jiffies;
 802
 803                 if (new_active->link == BOND_LINK_BACK) {
 804                         if (USES_PRIMARY(bond->params.mode)) {
 805                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
 806                                         bond->dev->name, new_active->dev->name,
 807                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
 808                         }
 809
 810                         new_active->delay = 0;
 811                         new_active->link = BOND_LINK_UP;
 812
 813                         if (bond->params.mode == BOND_MODE_8023AD)
 814                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 815
 816                         if (bond_is_lb(bond))
 817                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 818                 } else {
 819                         if (USES_PRIMARY(bond->params.mode)) {
 820                                 pr_info("%s: making interface %s the new active one.\n",
 821                                         bond->dev->name, new_active->dev->name);
 822                         }
 823                 }
 824         }
 825
 826         if (USES_PRIMARY(bond->params.mode))
 827                 bond_hw_addr_swap(bond, new_active, old_active);
 828
 829         if (bond_is_lb(bond)) {
 830                 bond_alb_handle_active_change(bond, new_active);
 831                 if (old_active)
 832                         bond_set_slave_inactive_flags(old_active);
 833                 if (new_active)
 834                         bond_set_slave_active_flags(new_active);
 835         } else {
 836                 rcu_assign_pointer(bond->curr_active_slave, new_active);
 837         }
 838
 839         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
 840                 if (old_active)
 841                         bond_set_slave_inactive_flags(old_active);
 842
 843                 if (new_active) {
 844                         bool should_notify_peers = false;
 845
 846                         bond_set_slave_active_flags(new_active);
 847
 848                         if (bond->params.fail_over_mac)
 849                                 bond_do_fail_over_mac(bond, new_active,
 850                                                       old_active);
 851
 852                         if (netif_running(bond->dev)) {
 853                                 bond->send_peer_notif =
 854                                         bond->params.num_peer_notif;
 855                                 should_notify_peers =
 856                                         bond_should_notify_peers(bond);
 857                         }
 858
 859                         write_unlock_bh(&bond->curr_slave_lock);
 860
 861                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 862                         if (should_notify_peers)
 863                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 864                                                          bond->dev);
 865
 866                         write_lock_bh(&bond->curr_slave_lock);
 867                 }
 868         }
 869
 870         /* resend IGMP joins since active slave has changed or
 871          * all were sent on curr_active_slave.
 872          * resend only if bond is brought up with the affected
 873          * bonding modes and the retransmission is enabled */
 874         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 875             ((USES_PRIMARY(bond->params.mode) && new_active) ||
 876              bond->params.mode == BOND_MODE_ROUNDROBIN)) {
 877                 bond->igmp_retrans = bond->params.resend_igmp;
 878                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 879         }
 880 }
 881
 882 /**
 883  * bond_select_active_slave - select a new active slave, if needed
 884  * @bond: our bonding struct
 885  *
 886  * This functions should be called when one of the following occurs:
 887  * - The old curr_active_slave has been released or lost its link.
 888  * - The primary_slave has got its link back.
 889  * - A slave has got its link back and there's no old curr_active_slave.
 890  *
 891  * Caller must hold curr_slave_lock for write_bh.
 892  */
 893 void bond_select_active_slave(struct bonding *bond)
 894 {
 895         struct slave *best_slave;
 896         int rv;
 897
 898         best_slave = bond_find_best_slave(bond);
 899         if (best_slave != bond->curr_active_slave) {
 900                 bond_change_active_slave(bond, best_slave);
 901                 rv = bond_set_carrier(bond);
 902                 if (!rv)
 903                         return;
 904
 905                 if (netif_carrier_ok(bond->dev)) {
 906                         pr_info("%s: first active interface up!\n",
 907                                 bond->dev->name);
 908                 } else {
 909                         pr_info("%s: now running without any active interface !\n",
 910                                 bond->dev->name);
 911                 }
 912         }
 913 }
 914
 915 #ifdef CONFIG_NET_POLL_CONTROLLER
 916 static inline int slave_enable_netpoll(struct slave *slave)
 917 {
 918         struct netpoll *np;
 919         int err = 0;
 920
 921         np = kzalloc(sizeof(*np), GFP_ATOMIC);
 922         err = -ENOMEM;
 923         if (!np)
 924                 goto out;
 925
 926         err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
 927         if (err) {
 928                 kfree(np);
 929                 goto out;
 930         }
 931         slave->np = np;
 932 out:
 933         return err;
 934 }
 935 static inline void slave_disable_netpoll(struct slave *slave)
 936 {
 937         struct netpoll *np = slave->np;
 938
 939         if (!np)
 940                 return;
 941
 942         slave->np = NULL;
 943         __netpoll_free_async(np);
 944 }
 945 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
 946 {
 947         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
 948                 return false;
 949         if (!slave_dev->netdev_ops->ndo_poll_controller)
 950                 return false;
 951         return true;
 952 }
 953
 954 static void bond_poll_controller(struct net_device *bond_dev)
 955 {
 956 }
 957
 958 static void bond_netpoll_cleanup(struct net_device *bond_dev)
 959 {
 960         struct bonding *bond = netdev_priv(bond_dev);
 961         struct list_head *iter;
 962         struct slave *slave;
 963
 964         bond_for_each_slave(bond, slave, iter)
 965                 if (IS_UP(slave->dev))
 966                         slave_disable_netpoll(slave);
 967 }
 968
 969 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
 970 {
 971         struct bonding *bond = netdev_priv(dev);
 972         struct list_head *iter;
 973         struct slave *slave;
 974         int err = 0;
 975
 976         bond_for_each_slave(bond, slave, iter) {
 977                 err = slave_enable_netpoll(slave);
 978                 if (err) {
 979                         bond_netpoll_cleanup(dev);
 980                         break;
 981                 }
 982         }
 983         return err;
 984 }
 985 #else
 986 static inline int slave_enable_netpoll(struct slave *slave)
 987 {
 988         return 0;
 989 }
 990 static inline void slave_disable_netpoll(struct slave *slave)
 991 {
 992 }
 993 static void bond_netpoll_cleanup(struct net_device *bond_dev)
 994 {
 995 }
 996 #endif
 997
 998 /*---------------------------------- IOCTL ----------------------------------*/
 999
1000 static netdev_features_t bond_fix_features(struct net_device *dev,
1001                                            netdev_features_t features)
1002 {
1003         struct bonding *bond = netdev_priv(dev);
1004         struct list_head *iter;
1005         netdev_features_t mask;
1006         struct slave *slave;
1007
1008         if (!bond_has_slaves(bond)) {
1009                 /* Disable adding VLANs to empty bond. But why? --mq */
1010                 features |= NETIF_F_VLAN_CHALLENGED;
1011                 return features;
1012         }
1013
1014         mask = features;
1015         features &= ~NETIF_F_ONE_FOR_ALL;
1016         features |= NETIF_F_ALL_FOR_ALL;
1017
1018         bond_for_each_slave(bond, slave, iter) {
1019                 features = netdev_increment_features(features,
1020                                                      slave->dev->features,
1021                                                      mask);
1022         }
1023         features = netdev_add_tso_features(features, mask);
1024
1025         return features;
1026 }
1027
1028 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1029                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1030                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1031
1032 static void bond_compute_features(struct bonding *bond)
1033 {
1034         unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1035         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1036         struct net_device *bond_dev = bond->dev;
1037         struct list_head *iter;
1038         struct slave *slave;
1039         unsigned short max_hard_header_len = ETH_HLEN;
1040         unsigned int gso_max_size = GSO_MAX_SIZE;
1041         u16 gso_max_segs = GSO_MAX_SEGS;
1042
1043         if (!bond_has_slaves(bond))
1044                 goto done;
1045
1046         bond_for_each_slave(bond, slave, iter) {
1047                 vlan_features = netdev_increment_features(vlan_features,
1048                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1049
1050                 dst_release_flag &= slave->dev->priv_flags;
1051                 if (slave->dev->hard_header_len > max_hard_header_len)
1052                         max_hard_header_len = slave->dev->hard_header_len;
1053
1054                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1055                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1056         }
1057
1058 done:
1059         bond_dev->vlan_features = vlan_features;
1060         bond_dev->hard_header_len = max_hard_header_len;
1061         bond_dev->gso_max_segs = gso_max_segs;
1062         netif_set_gso_max_size(bond_dev, gso_max_size);
1063
1064         flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1065         bond_dev->priv_flags = flags | dst_release_flag;
1066
1067         netdev_change_features(bond_dev);
1068 }
1069
1070 static void bond_setup_by_slave(struct net_device *bond_dev,
1071                                 struct net_device *slave_dev)
1072 {
1073         bond_dev->header_ops        = slave_dev->header_ops;
1074
1075         bond_dev->type              = slave_dev->type;
1076         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1077         bond_dev->addr_len          = slave_dev->addr_len;
1078
1079         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1080                 slave_dev->addr_len);
1081 }
1082
1083 /* On bonding slaves other than the currently active slave, suppress
1084  * duplicates except for alb non-mcast/bcast.
1085  */
1086 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1087                                             struct slave *slave,
1088                                             struct bonding *bond)
1089 {
1090         if (bond_is_slave_inactive(slave)) {
1091                 if (bond->params.mode == BOND_MODE_ALB &&
1092                     skb->pkt_type != PACKET_BROADCAST &&
1093                     skb->pkt_type != PACKET_MULTICAST)
1094                         return false;
1095                 return true;
1096         }
1097         return false;
1098 }
1099
1100 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1101 {
1102         struct sk_buff *skb = *pskb;
1103         struct slave *slave;
1104         struct bonding *bond;
1105         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1106                           struct slave *);
1107         int ret = RX_HANDLER_ANOTHER;
1108
1109         skb = skb_share_check(skb, GFP_ATOMIC);
1110         if (unlikely(!skb))
1111                 return RX_HANDLER_CONSUMED;
1112
1113         *pskb = skb;
1114
1115         slave = bond_slave_get_rcu(skb->dev);
1116         bond = slave->bond;
1117
1118         if (bond->params.arp_interval)
1119                 slave->dev->last_rx = jiffies;
1120
1121         recv_probe = ACCESS_ONCE(bond->recv_probe);
1122         if (recv_probe) {
1123                 ret = recv_probe(skb, bond, slave);
1124                 if (ret == RX_HANDLER_CONSUMED) {
1125                         consume_skb(skb);
1126                         return ret;
1127                 }
1128         }
1129
1130         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1131                 return RX_HANDLER_EXACT;
1132         }
1133
1134         skb->dev = bond->dev;
1135
1136         if (bond->params.mode == BOND_MODE_ALB &&
1137             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1138             skb->pkt_type == PACKET_HOST) {
1139
1140                 if (unlikely(skb_cow_head(skb,
1141                                           skb->data - skb_mac_header(skb)))) {
1142                         kfree_skb(skb);
1143                         return RX_HANDLER_CONSUMED;
1144                 }
1145                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1146         }
1147
1148         return ret;
1149 }
1150
1151 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1152                                       struct net_device *slave_dev,
1153                                       struct slave *slave)
1154 {
1155         int err;
1156
1157         err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1158         if (err)
1159                 return err;
1160         slave_dev->flags |= IFF_SLAVE;
1161         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1162         return 0;
1163 }
1164
1165 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1166                                   struct net_device *slave_dev)
1167 {
1168         netdev_upper_dev_unlink(slave_dev, bond_dev);
1169         slave_dev->flags &= ~IFF_SLAVE;
1170         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1171 }
1172
1173 /* enslave device <slave> to bond device <master> */
1174 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1175 {
1176         struct bonding *bond = netdev_priv(bond_dev);
1177         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1178         struct slave *new_slave = NULL, *prev_slave;
1179         struct sockaddr addr;
1180         int link_reporting;
1181         int res = 0, i;
1182
1183         if (!bond->params.use_carrier &&
1184             slave_dev->ethtool_ops->get_link == NULL &&
1185             slave_ops->ndo_do_ioctl == NULL) {
1186                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1187                            bond_dev->name, slave_dev->name);
1188         }
1189
1190         /* already enslaved */
1191         if (slave_dev->flags & IFF_SLAVE) {
1192                 pr_debug("Error, Device was already enslaved\n");
1193                 return -EBUSY;
1194         }
1195
1196         /* vlan challenged mutual exclusion */
1197         /* no need to lock since we're protected by rtnl_lock */
1198         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1199                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1200                 if (vlan_uses_dev(bond_dev)) {
1201                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1202                                bond_dev->name, slave_dev->name, bond_dev->name);
1203                         return -EPERM;
1204                 } else {
1205                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1206                                    bond_dev->name, slave_dev->name,
1207                                    slave_dev->name, bond_dev->name);
1208                 }
1209         } else {
1210                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1211         }
1212
1213         /*
1214          * Old ifenslave binaries are no longer supported.  These can
1215          * be identified with moderate accuracy by the state of the slave:
1216          * the current ifenslave will set the interface down prior to
1217          * enslaving it; the old ifenslave will not.
1218          */
1219         if ((slave_dev->flags & IFF_UP)) {
1220                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1221                        slave_dev->name);
1222                 res = -EPERM;
1223                 goto err_undo_flags;
1224         }
1225
1226         /* set bonding device ether type by slave - bonding netdevices are
1227          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1228          * there is a need to override some of the type dependent attribs/funcs.
1229          *
1230          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1231          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1232          */
1233         if (!bond_has_slaves(bond)) {
1234                 if (bond_dev->type != slave_dev->type) {
1235                         pr_debug("%s: change device type from %d to %d\n",
1236                                  bond_dev->name,
1237                                  bond_dev->type, slave_dev->type);
1238
1239                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1240                                                        bond_dev);
1241                         res = notifier_to_errno(res);
1242                         if (res) {
1243                                 pr_err("%s: refused to change device type\n",
1244                                        bond_dev->name);
1245                                 res = -EBUSY;
1246                                 goto err_undo_flags;
1247                         }
1248
1249                         /* Flush unicast and multicast addresses */
1250                         dev_uc_flush(bond_dev);
1251                         dev_mc_flush(bond_dev);
1252
1253                         if (slave_dev->type != ARPHRD_ETHER)
1254                                 bond_setup_by_slave(bond_dev, slave_dev);
1255                         else {
1256                                 ether_setup(bond_dev);
1257                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1258                         }
1259
1260                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1261                                                  bond_dev);
1262                 }
1263         } else if (bond_dev->type != slave_dev->type) {
1264                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1265                        slave_dev->name,
1266                        slave_dev->type, bond_dev->type);
1267                 res = -EINVAL;
1268                 goto err_undo_flags;
1269         }
1270
1271         if (slave_ops->ndo_set_mac_address == NULL) {
1272                 if (!bond_has_slaves(bond)) {
1273                         pr_warn("%s: Warning: The first slave device specified does not support setting the MAC address.\n",
1274                                 bond_dev->name);
1275                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1276                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1277                                 pr_warn("%s: Setting fail_over_mac to active for active-backup mode.\n",
1278                                         bond_dev->name);
1279                         }
1280                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1281                         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",
1282                                bond_dev->name);
1283                         res = -EOPNOTSUPP;
1284                         goto err_undo_flags;
1285                 }
1286         }
1287
1288         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1289
1290         /* If this is the first slave, then we need to set the master's hardware
1291          * address to be the same as the slave's. */
1292         if (!bond_has_slaves(bond) &&
1293             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1294                 bond_set_dev_addr(bond->dev, slave_dev);
1295
1296         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1297         if (!new_slave) {
1298                 res = -ENOMEM;
1299                 goto err_undo_flags;
1300         }
1301         /*
1302          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1303          * is set via sysfs or module option if desired.
1304          */
1305         new_slave->queue_id = 0;
1306
1307         /* Save slave's original mtu and then set it to match the bond */
1308         new_slave->original_mtu = slave_dev->mtu;
1309         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1310         if (res) {
1311                 pr_debug("Error %d calling dev_set_mtu\n", res);
1312                 goto err_free;
1313         }
1314
1315         /*
1316          * Save slave's original ("permanent") mac address for modes
1317          * that need it, and for restoring it upon release, and then
1318          * set it to the master's address
1319          */
1320         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1321
1322         if (!bond->params.fail_over_mac ||
1323             bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
1324                 /*
1325                  * Set slave to master's mac address.  The application already
1326                  * set the master's mac address to that of the first slave
1327                  */
1328                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1329                 addr.sa_family = slave_dev->type;
1330                 res = dev_set_mac_address(slave_dev, &addr);
1331                 if (res) {
1332                         pr_debug("Error %d calling set_mac_address\n", res);
1333                         goto err_restore_mtu;
1334                 }
1335         }
1336
1337         /* open the slave since the application closed it */
1338         res = dev_open(slave_dev);
1339         if (res) {
1340                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1341                 goto err_restore_mac;
1342         }
1343
1344         new_slave->bond = bond;
1345         new_slave->dev = slave_dev;
1346         slave_dev->priv_flags |= IFF_BONDING;
1347
1348         if (bond_is_lb(bond)) {
1349                 /* bond_alb_init_slave() must be called before all other stages since
1350                  * it might fail and we do not want to have to undo everything
1351                  */
1352                 res = bond_alb_init_slave(bond, new_slave);
1353                 if (res)
1354                         goto err_close;
1355         }
1356
1357         /* If the mode USES_PRIMARY, then the following is handled by
1358          * bond_change_active_slave().
1359          */
1360         if (!USES_PRIMARY(bond->params.mode)) {
1361                 /* set promiscuity level to new slave */
1362                 if (bond_dev->flags & IFF_PROMISC) {
1363                         res = dev_set_promiscuity(slave_dev, 1);
1364                         if (res)
1365                                 goto err_close;
1366                 }
1367
1368                 /* set allmulti level to new slave */
1369                 if (bond_dev->flags & IFF_ALLMULTI) {
1370                         res = dev_set_allmulti(slave_dev, 1);
1371                         if (res)
1372                                 goto err_close;
1373                 }
1374
1375                 netif_addr_lock_bh(bond_dev);
1376
1377                 dev_mc_sync_multiple(slave_dev, bond_dev);
1378                 dev_uc_sync_multiple(slave_dev, bond_dev);
1379
1380                 netif_addr_unlock_bh(bond_dev);
1381         }
1382
1383         if (bond->params.mode == BOND_MODE_8023AD) {
1384                 /* add lacpdu mc addr to mc list */
1385                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1386
1387                 dev_mc_add(slave_dev, lacpdu_multicast);
1388         }
1389
1390         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1391         if (res) {
1392                 pr_err("%s: Error: Couldn't add bond vlan ids to %s\n",
1393                        bond_dev->name, slave_dev->name);
1394                 goto err_close;
1395         }
1396
1397         prev_slave = bond_last_slave(bond);
1398
1399         new_slave->delay = 0;
1400         new_slave->link_failure_count = 0;
1401
1402         bond_update_speed_duplex(new_slave);
1403
1404         new_slave->last_arp_rx = jiffies -
1405                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1406         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1407                 new_slave->target_last_arp_rx[i] = new_slave->last_arp_rx;
1408
1409         if (bond->params.miimon && !bond->params.use_carrier) {
1410                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1411
1412                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1413                         /*
1414                          * miimon is set but a bonded network driver
1415                          * does not support ETHTOOL/MII and
1416                          * arp_interval is not set.  Note: if
1417                          * use_carrier is enabled, we will never go
1418                          * here (because netif_carrier is always
1419                          * supported); thus, we don't need to change
1420                          * the messages for netif_carrier.
1421                          */
1422                         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",
1423                                bond_dev->name, slave_dev->name);
1424                 } else if (link_reporting == -1) {
1425                         /* unable get link status using mii/ethtool */
1426                         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",
1427                                    bond_dev->name, slave_dev->name);
1428                 }
1429         }
1430
1431         /* check for initial state */
1432         if (bond->params.miimon) {
1433                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1434                         if (bond->params.updelay) {
1435                                 new_slave->link = BOND_LINK_BACK;
1436                                 new_slave->delay = bond->params.updelay;
1437                         } else {
1438                                 new_slave->link = BOND_LINK_UP;
1439                         }
1440                 } else {
1441                         new_slave->link = BOND_LINK_DOWN;
1442                 }
1443         } else if (bond->params.arp_interval) {
1444                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1445                         BOND_LINK_UP : BOND_LINK_DOWN);
1446         } else {
1447                 new_slave->link = BOND_LINK_UP;
1448         }
1449
1450         if (new_slave->link != BOND_LINK_DOWN)
1451                 new_slave->jiffies = jiffies;
1452         pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1453                 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1454                         (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1455
1456         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1457                 /* if there is a primary slave, remember it */
1458                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1459                         bond->primary_slave = new_slave;
1460                         bond->force_primary = true;
1461                 }
1462         }
1463
1464         switch (bond->params.mode) {
1465         case BOND_MODE_ACTIVEBACKUP:
1466                 bond_set_slave_inactive_flags(new_slave);
1467                 break;
1468         case BOND_MODE_8023AD:
1469                 /* in 802.3ad mode, the internal mechanism
1470                  * will activate the slaves in the selected
1471                  * aggregator
1472                  */
1473                 bond_set_slave_inactive_flags(new_slave);
1474                 /* if this is the first slave */
1475                 if (!prev_slave) {
1476                         SLAVE_AD_INFO(new_slave).id = 1;
1477                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1478                          * can be called only after the mac address of the bond is set
1479                          */
1480                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1481                 } else {
1482                         SLAVE_AD_INFO(new_slave).id =
1483                                 SLAVE_AD_INFO(prev_slave).id + 1;
1484                 }
1485
1486                 bond_3ad_bind_slave(new_slave);
1487                 break;
1488         case BOND_MODE_TLB:
1489         case BOND_MODE_ALB:
1490                 bond_set_active_slave(new_slave);
1491                 bond_set_slave_inactive_flags(new_slave);
1492                 break;
1493         default:
1494                 pr_debug("This slave is always active in trunk mode\n");
1495
1496                 /* always active in trunk mode */
1497                 bond_set_active_slave(new_slave);
1498
1499                 /* In trunking mode there is little meaning to curr_active_slave
1500                  * anyway (it holds no special properties of the bond device),
1501                  * so we can change it without calling change_active_interface()
1502                  */
1503                 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1504                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1505
1506                 break;
1507         } /* switch(bond_mode) */
1508
1509 #ifdef CONFIG_NET_POLL_CONTROLLER
1510         slave_dev->npinfo = bond->dev->npinfo;
1511         if (slave_dev->npinfo) {
1512                 if (slave_enable_netpoll(new_slave)) {
1513                         pr_info("Error, %s: master_dev is using netpoll, "
1514                                  "but new slave device does not support netpoll.\n",
1515                                  bond_dev->name);
1516                         res = -EBUSY;
1517                         goto err_detach;
1518                 }
1519         }
1520 #endif
1521
1522         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1523                                          new_slave);
1524         if (res) {
1525                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1526                 goto err_detach;
1527         }
1528
1529         res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1530         if (res) {
1531                 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1532                 goto err_unregister;
1533         }
1534
1535         res = bond_sysfs_slave_add(new_slave);
1536         if (res) {
1537                 pr_debug("Error %d calling bond_sysfs_slave_add\n", res);
1538                 goto err_upper_unlink;
1539         }
1540
1541         bond->slave_cnt++;
1542         bond_compute_features(bond);
1543         bond_set_carrier(bond);
1544
1545         if (USES_PRIMARY(bond->params.mode)) {
1546                 block_netpoll_tx();
1547                 write_lock_bh(&bond->curr_slave_lock);
1548                 bond_select_active_slave(bond);
1549                 write_unlock_bh(&bond->curr_slave_lock);
1550                 unblock_netpoll_tx();
1551         }
1552
1553         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1554                 bond_dev->name, slave_dev->name,
1555                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1556                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1557
1558         /* enslave is successful */
1559         return 0;
1560
1561 /* Undo stages on error */
1562 err_upper_unlink:
1563         bond_upper_dev_unlink(bond_dev, slave_dev);
1564
1565 err_unregister:
1566         netdev_rx_handler_unregister(slave_dev);
1567
1568 err_detach:
1569         if (!USES_PRIMARY(bond->params.mode))
1570                 bond_hw_addr_flush(bond_dev, slave_dev);
1571
1572         vlan_vids_del_by_dev(slave_dev, bond_dev);
1573         if (bond->primary_slave == new_slave)
1574                 bond->primary_slave = NULL;
1575         if (bond->curr_active_slave == new_slave) {
1576                 block_netpoll_tx();
1577                 write_lock_bh(&bond->curr_slave_lock);
1578                 bond_change_active_slave(bond, NULL);
1579                 bond_select_active_slave(bond);
1580                 write_unlock_bh(&bond->curr_slave_lock);
1581                 unblock_netpoll_tx();
1582         }
1583         slave_disable_netpoll(new_slave);
1584
1585 err_close:
1586         slave_dev->priv_flags &= ~IFF_BONDING;
1587         dev_close(slave_dev);
1588
1589 err_restore_mac:
1590         if (!bond->params.fail_over_mac ||
1591             bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
1592                 /* XXX TODO - fom follow mode needs to change master's
1593                  * MAC if this slave's MAC is in use by the bond, or at
1594                  * least print a warning.
1595                  */
1596                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1597                 addr.sa_family = slave_dev->type;
1598                 dev_set_mac_address(slave_dev, &addr);
1599         }
1600
1601 err_restore_mtu:
1602         dev_set_mtu(slave_dev, new_slave->original_mtu);
1603
1604 err_free:
1605         kfree(new_slave);
1606
1607 err_undo_flags:
1608         /* Enslave of first slave has failed and we need to fix master's mac */
1609         if (!bond_has_slaves(bond) &&
1610             ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
1611                 eth_hw_addr_random(bond_dev);
1612
1613         return res;
1614 }
1615
1616 /*
1617  * Try to release the slave device <slave> from the bond device <master>
1618  * It is legal to access curr_active_slave without a lock because all the function
1619  * is write-locked. If "all" is true it means that the function is being called
1620  * while destroying a bond interface and all slaves are being released.
1621  *
1622  * The rules for slave state should be:
1623  *   for Active/Backup:
1624  *     Active stays on all backups go down
1625  *   for Bonded connections:
1626  *     The first up interface should be left on and all others downed.
1627  */
1628 static int __bond_release_one(struct net_device *bond_dev,
1629                               struct net_device *slave_dev,
1630                               bool all)
1631 {
1632         struct bonding *bond = netdev_priv(bond_dev);
1633         struct slave *slave, *oldcurrent;
1634         struct sockaddr addr;
1635         int old_flags = bond_dev->flags;
1636         netdev_features_t old_features = bond_dev->features;
1637
1638         /* slave is not a slave or master is not master of this slave */
1639         if (!(slave_dev->flags & IFF_SLAVE) ||
1640             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1641                 pr_err("%s: Error: cannot release %s.\n",
1642                        bond_dev->name, slave_dev->name);
1643                 return -EINVAL;
1644         }
1645
1646         block_netpoll_tx();
1647
1648         slave = bond_get_slave_by_dev(bond, slave_dev);
1649         if (!slave) {
1650                 /* not a slave of this bond */
1651                 pr_info("%s: %s not enslaved\n",
1652                         bond_dev->name, slave_dev->name);
1653                 unblock_netpoll_tx();
1654                 return -EINVAL;
1655         }
1656
1657         /* release the slave from its bond */
1658         bond->slave_cnt--;
1659
1660         bond_sysfs_slave_del(slave);
1661
1662         bond_upper_dev_unlink(bond_dev, slave_dev);
1663         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1664          * for this slave anymore.
1665          */
1666         netdev_rx_handler_unregister(slave_dev);
1667         write_lock_bh(&bond->lock);
1668
1669         /* Inform AD package of unbinding of slave. */
1670         if (bond->params.mode == BOND_MODE_8023AD)
1671                 bond_3ad_unbind_slave(slave);
1672
1673         write_unlock_bh(&bond->lock);
1674
1675         pr_info("%s: releasing %s interface %s\n",
1676                 bond_dev->name,
1677                 bond_is_active_slave(slave) ? "active" : "backup",
1678                 slave_dev->name);
1679
1680         oldcurrent = bond->curr_active_slave;
1681
1682         bond->current_arp_slave = NULL;
1683
1684         if (!all && (!bond->params.fail_over_mac ||
1685                      bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
1686                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1687                     bond_has_slaves(bond))
1688                         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",
1689                                    bond_dev->name, slave_dev->name,
1690                                    slave->perm_hwaddr,
1691                                    bond_dev->name, slave_dev->name);
1692         }
1693
1694         if (bond->primary_slave == slave)
1695                 bond->primary_slave = NULL;
1696
1697         if (oldcurrent == slave) {
1698                 write_lock_bh(&bond->curr_slave_lock);
1699                 bond_change_active_slave(bond, NULL);
1700                 write_unlock_bh(&bond->curr_slave_lock);
1701         }
1702
1703         if (bond_is_lb(bond)) {
1704                 /* Must be called only after the slave has been
1705                  * detached from the list and the curr_active_slave
1706                  * has been cleared (if our_slave == old_current),
1707                  * but before a new active slave is selected.
1708                  */
1709                 bond_alb_deinit_slave(bond, slave);
1710         }
1711
1712         if (all) {
1713                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1714         } else if (oldcurrent == slave) {
1715                 /*
1716                  * Note that we hold RTNL over this sequence, so there
1717                  * is no concern that another slave add/remove event
1718                  * will interfere.
1719                  */
1720                 write_lock_bh(&bond->curr_slave_lock);
1721
1722                 bond_select_active_slave(bond);
1723
1724                 write_unlock_bh(&bond->curr_slave_lock);
1725         }
1726
1727         if (!bond_has_slaves(bond)) {
1728                 bond_set_carrier(bond);
1729                 eth_hw_addr_random(bond_dev);
1730
1731                 if (vlan_uses_dev(bond_dev)) {
1732                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1733                                    bond_dev->name, bond_dev->name);
1734                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1735                                    bond_dev->name);
1736                 }
1737         }
1738
1739         unblock_netpoll_tx();
1740         synchronize_rcu();
1741
1742         if (!bond_has_slaves(bond)) {
1743                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1744                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1745         }
1746
1747         bond_compute_features(bond);
1748         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1749             (old_features & NETIF_F_VLAN_CHALLENGED))
1750                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1751                         bond_dev->name, slave_dev->name, bond_dev->name);
1752
1753         /* must do this from outside any spinlocks */
1754         vlan_vids_del_by_dev(slave_dev, bond_dev);
1755
1756         /* If the mode USES_PRIMARY, then this cases was handled above by
1757          * bond_change_active_slave(..., NULL)
1758          */
1759         if (!USES_PRIMARY(bond->params.mode)) {
1760                 /* unset promiscuity level from slave
1761                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1762                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1763                  * value of that flag before that change, as that was the value
1764                  * when this slave was attached, so we cache at the start of the
1765                  * function and use it here. Same goes for ALLMULTI below
1766                  */
1767                 if (old_flags & IFF_PROMISC)
1768                         dev_set_promiscuity(slave_dev, -1);
1769
1770                 /* unset allmulti level from slave */
1771                 if (old_flags & IFF_ALLMULTI)
1772                         dev_set_allmulti(slave_dev, -1);
1773
1774                 bond_hw_addr_flush(bond_dev, slave_dev);
1775         }
1776
1777         slave_disable_netpoll(slave);
1778
1779         /* close slave before restoring its mac address */
1780         dev_close(slave_dev);
1781
1782         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1783             bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
1784                 /* restore original ("permanent") mac address */
1785                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1786                 addr.sa_family = slave_dev->type;
1787                 dev_set_mac_address(slave_dev, &addr);
1788         }
1789
1790         dev_set_mtu(slave_dev, slave->original_mtu);
1791
1792         slave_dev->priv_flags &= ~IFF_BONDING;
1793
1794         kfree(slave);
1795
1796         return 0;  /* deletion OK */
1797 }
1798
1799 /* A wrapper used because of ndo_del_link */
1800 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1801 {
1802         return __bond_release_one(bond_dev, slave_dev, false);
1803 }
1804
1805 /*
1806 * First release a slave and then destroy the bond if no more slaves are left.
1807 * Must be under rtnl_lock when this function is called.
1808 */
1809 static int  bond_release_and_destroy(struct net_device *bond_dev,
1810                                      struct net_device *slave_dev)
1811 {
1812         struct bonding *bond = netdev_priv(bond_dev);
1813         int ret;
1814
1815         ret = bond_release(bond_dev, slave_dev);
1816         if (ret == 0 && !bond_has_slaves(bond)) {
1817                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1818                 pr_info("%s: destroying bond %s.\n",
1819                         bond_dev->name, bond_dev->name);
1820                 unregister_netdevice(bond_dev);
1821         }
1822         return ret;
1823 }
1824
1825 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1826 {
1827         struct bonding *bond = netdev_priv(bond_dev);
1828
1829         info->bond_mode = bond->params.mode;
1830         info->miimon = bond->params.miimon;
1831
1832         read_lock(&bond->lock);
1833         info->num_slaves = bond->slave_cnt;
1834         read_unlock(&bond->lock);
1835
1836         return 0;
1837 }
1838
1839 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1840 {
1841         struct bonding *bond = netdev_priv(bond_dev);
1842         struct list_head *iter;
1843         int i = 0, res = -ENODEV;
1844         struct slave *slave;
1845
1846         read_lock(&bond->lock);
1847         bond_for_each_slave(bond, slave, iter) {
1848                 if (i++ == (int)info->slave_id) {
1849                         res = 0;
1850                         strcpy(info->slave_name, slave->dev->name);
1851                         info->link = slave->link;
1852                         info->state = bond_slave_state(slave);
1853                         info->link_failure_count = slave->link_failure_count;
1854                         break;
1855                 }
1856         }
1857         read_unlock(&bond->lock);
1858
1859         return res;
1860 }
1861
1862 /*-------------------------------- Monitoring -------------------------------*/
1863
1864
1865 static int bond_miimon_inspect(struct bonding *bond)
1866 {
1867         int link_state, commit = 0;
1868         struct list_head *iter;
1869         struct slave *slave;
1870         bool ignore_updelay;
1871
1872         ignore_updelay = !bond->curr_active_slave ? true : false;
1873
1874         bond_for_each_slave_rcu(bond, slave, iter) {
1875                 slave->new_link = BOND_LINK_NOCHANGE;
1876
1877                 link_state = bond_check_dev_link(bond, slave->dev, 0);
1878
1879                 switch (slave->link) {
1880                 case BOND_LINK_UP:
1881                         if (link_state)
1882                                 continue;
1883
1884                         slave->link = BOND_LINK_FAIL;
1885                         slave->delay = bond->params.downdelay;
1886                         if (slave->delay) {
1887                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
1888                                         bond->dev->name,
1889                                         (bond->params.mode ==
1890                                          BOND_MODE_ACTIVEBACKUP) ?
1891                                         (bond_is_active_slave(slave) ?
1892                                          "active " : "backup ") : "",
1893                                         slave->dev->name,
1894                                         bond->params.downdelay * bond->params.miimon);
1895                         }
1896                         /*FALLTHRU*/
1897                 case BOND_LINK_FAIL:
1898                         if (link_state) {
1899                                 /*
1900                                  * recovered before downdelay expired
1901                                  */
1902                                 slave->link = BOND_LINK_UP;
1903                                 slave->jiffies = jiffies;
1904                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
1905                                         bond->dev->name,
1906                                         (bond->params.downdelay - slave->delay) *
1907                                         bond->params.miimon,
1908                                         slave->dev->name);
1909                                 continue;
1910                         }
1911
1912                         if (slave->delay <= 0) {
1913                                 slave->new_link = BOND_LINK_DOWN;
1914                                 commit++;
1915                                 continue;
1916                         }
1917
1918                         slave->delay--;
1919                         break;
1920
1921                 case BOND_LINK_DOWN:
1922                         if (!link_state)
1923                                 continue;
1924
1925                         slave->link = BOND_LINK_BACK;
1926                         slave->delay = bond->params.updelay;
1927
1928                         if (slave->delay) {
1929                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
1930                                         bond->dev->name, slave->dev->name,
1931                                         ignore_updelay ? 0 :
1932                                         bond->params.updelay *
1933                                         bond->params.miimon);
1934                         }
1935                         /*FALLTHRU*/
1936                 case BOND_LINK_BACK:
1937                         if (!link_state) {
1938                                 slave->link = BOND_LINK_DOWN;
1939                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
1940                                         bond->dev->name,
1941                                         (bond->params.updelay - slave->delay) *
1942                                         bond->params.miimon,
1943                                         slave->dev->name);
1944
1945                                 continue;
1946                         }
1947
1948                         if (ignore_updelay)
1949                                 slave->delay = 0;
1950
1951                         if (slave->delay <= 0) {
1952                                 slave->new_link = BOND_LINK_UP;
1953                                 commit++;
1954                                 ignore_updelay = false;
1955                                 continue;
1956                         }
1957
1958                         slave->delay--;
1959                         break;
1960                 }
1961         }
1962
1963         return commit;
1964 }
1965
1966 static void bond_miimon_commit(struct bonding *bond)
1967 {
1968         struct list_head *iter;
1969         struct slave *slave;
1970
1971         bond_for_each_slave(bond, slave, iter) {
1972                 switch (slave->new_link) {
1973                 case BOND_LINK_NOCHANGE:
1974                         continue;
1975
1976                 case BOND_LINK_UP:
1977                         slave->link = BOND_LINK_UP;
1978                         slave->jiffies = jiffies;
1979
1980                         if (bond->params.mode == BOND_MODE_8023AD) {
1981                                 /* prevent it from being the active one */
1982                                 bond_set_backup_slave(slave);
1983                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
1984                                 /* make it immediately active */
1985                                 bond_set_active_slave(slave);
1986                         } else if (slave != bond->primary_slave) {
1987                                 /* prevent it from being the active one */
1988                                 bond_set_backup_slave(slave);
1989                         }
1990
1991                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
1992                                 bond->dev->name, slave->dev->name,
1993                                 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
1994                                 slave->duplex ? "full" : "half");
1995
1996                         /* notify ad that the link status has changed */
1997                         if (bond->params.mode == BOND_MODE_8023AD)
1998                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
1999
2000                         if (bond_is_lb(bond))
2001                                 bond_alb_handle_link_change(bond, slave,
2002                                                             BOND_LINK_UP);
2003
2004                         if (!bond->curr_active_slave ||
2005                             (slave == bond->primary_slave))
2006                                 goto do_failover;
2007
2008                         continue;
2009
2010                 case BOND_LINK_DOWN:
2011                         if (slave->link_failure_count < UINT_MAX)
2012                                 slave->link_failure_count++;
2013
2014                         slave->link = BOND_LINK_DOWN;
2015
2016                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2017                             bond->params.mode == BOND_MODE_8023AD)
2018                                 bond_set_slave_inactive_flags(slave);
2019
2020                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2021                                 bond->dev->name, slave->dev->name);
2022
2023                         if (bond->params.mode == BOND_MODE_8023AD)
2024                                 bond_3ad_handle_link_change(slave,
2025                                                             BOND_LINK_DOWN);
2026
2027                         if (bond_is_lb(bond))
2028                                 bond_alb_handle_link_change(bond, slave,
2029                                                             BOND_LINK_DOWN);
2030
2031                         if (slave == bond->curr_active_slave)
2032                                 goto do_failover;
2033
2034                         continue;
2035
2036                 default:
2037                         pr_err("%s: invalid new link %d on slave %s\n",
2038                                bond->dev->name, slave->new_link,
2039                                slave->dev->name);
2040                         slave->new_link = BOND_LINK_NOCHANGE;
2041
2042                         continue;
2043                 }
2044
2045 do_failover:
2046                 ASSERT_RTNL();
2047                 block_netpoll_tx();
2048                 write_lock_bh(&bond->curr_slave_lock);
2049                 bond_select_active_slave(bond);
2050                 write_unlock_bh(&bond->curr_slave_lock);
2051                 unblock_netpoll_tx();
2052         }
2053
2054         bond_set_carrier(bond);
2055 }
2056
2057 /*
2058  * bond_mii_monitor
2059  *
2060  * Really a wrapper that splits the mii monitor into two phases: an
2061  * inspection, then (if inspection indicates something needs to be done)
2062  * an acquisition of appropriate locks followed by a commit phase to
2063  * implement whatever link state changes are indicated.
2064  */
2065 static void bond_mii_monitor(struct work_struct *work)
2066 {
2067         struct bonding *bond = container_of(work, struct bonding,
2068                                             mii_work.work);
2069         bool should_notify_peers = false;
2070         unsigned long delay;
2071
2072         delay = msecs_to_jiffies(bond->params.miimon);
2073
2074         if (!bond_has_slaves(bond))
2075                 goto re_arm;
2076
2077         rcu_read_lock();
2078
2079         should_notify_peers = bond_should_notify_peers(bond);
2080
2081         if (bond_miimon_inspect(bond)) {
2082                 rcu_read_unlock();
2083
2084                 /* Race avoidance with bond_close cancel of workqueue */
2085                 if (!rtnl_trylock()) {
2086                         delay = 1;
2087                         should_notify_peers = false;
2088                         goto re_arm;
2089                 }
2090
2091                 bond_miimon_commit(bond);
2092
2093                 rtnl_unlock();  /* might sleep, hold no other locks */
2094         } else
2095                 rcu_read_unlock();
2096
2097 re_arm:
2098         if (bond->params.miimon)
2099                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2100
2101         if (should_notify_peers) {
2102                 if (!rtnl_trylock())
2103                         return;
2104                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2105                 rtnl_unlock();
2106         }
2107 }
2108
2109 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2110 {
2111         struct net_device *upper;
2112         struct list_head *iter;
2113         bool ret = false;
2114
2115         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2116                 return true;
2117
2118         rcu_read_lock();
2119         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2120                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2121                         ret = true;
2122                         break;
2123                 }
2124         }
2125         rcu_read_unlock();
2126
2127         return ret;
2128 }
2129
2130 /*
2131  * We go to the (large) trouble of VLAN tagging ARP frames because
2132  * switches in VLAN mode (especially if ports are configured as
2133  * "native" to a VLAN) might not pass non-tagged frames.
2134  */
2135 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2136 {
2137         struct sk_buff *skb;
2138
2139         pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op,
2140                  slave_dev->name, &dest_ip, &src_ip, vlan_id);
2141
2142         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2143                          NULL, slave_dev->dev_addr, NULL);
2144
2145         if (!skb) {
2146                 pr_err("ARP packet allocation failed\n");
2147                 return;
2148         }
2149         if (vlan_id) {
2150                 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2151                 if (!skb) {
2152                         pr_err("failed to insert VLAN tag\n");
2153                         return;
2154                 }
2155         }
2156         arp_xmit(skb);
2157 }
2158
2159
2160 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2161 {
2162         struct net_device *upper, *vlan_upper;
2163         struct list_head *iter, *vlan_iter;
2164         struct rtable *rt;
2165         __be32 *targets = bond->params.arp_targets, addr;
2166         int i, vlan_id;
2167
2168         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2169                 pr_debug("basa: target %pI4\n", &targets[i]);
2170
2171                 /* Find out through which dev should the packet go */
2172                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2173                                      RTO_ONLINK, 0);
2174                 if (IS_ERR(rt)) {
2175                         pr_debug("%s: no route to arp_ip_target %pI4\n",
2176                                  bond->dev->name, &targets[i]);
2177                         continue;
2178                 }
2179
2180                 vlan_id = 0;
2181
2182                 /* bond device itself */
2183                 if (rt->dst.dev == bond->dev)
2184                         goto found;
2185
2186                 rcu_read_lock();
2187                 /* first we search only for vlan devices. for every vlan
2188                  * found we verify its upper dev list, searching for the
2189                  * rt->dst.dev. If found we save the tag of the vlan and
2190                  * proceed to send the packet.
2191                  *
2192                  * TODO: QinQ?
2193                  */
2194                 netdev_for_each_all_upper_dev_rcu(bond->dev, vlan_upper,
2195                                                   vlan_iter) {
2196                         if (!is_vlan_dev(vlan_upper))
2197                                 continue;
2198                         netdev_for_each_all_upper_dev_rcu(vlan_upper, upper,
2199                                                           iter) {
2200                                 if (upper == rt->dst.dev) {
2201                                         vlan_id = vlan_dev_vlan_id(vlan_upper);
2202                                         rcu_read_unlock();
2203                                         goto found;
2204                                 }
2205                         }
2206                 }
2207
2208                 /* if the device we're looking for is not on top of any of
2209                  * our upper vlans, then just search for any dev that
2210                  * matches, and in case it's a vlan - save the id
2211                  */
2212                 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2213                         if (upper == rt->dst.dev) {
2214                                 /* if it's a vlan - get its VID */
2215                                 if (is_vlan_dev(upper))
2216                                         vlan_id = vlan_dev_vlan_id(upper);
2217
2218                                 rcu_read_unlock();
2219                                 goto found;
2220                         }
2221                 }
2222                 rcu_read_unlock();
2223
2224                 /* Not our device - skip */
2225                 pr_debug("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2226                          bond->dev->name, &targets[i],
2227                          rt->dst.dev ? rt->dst.dev->name : "NULL");
2228
2229                 ip_rt_put(rt);
2230                 continue;
2231
2232 found:
2233                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2234                 ip_rt_put(rt);
2235                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2236                               addr, vlan_id);
2237         }
2238 }
2239
2240 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2241 {
2242         int i;
2243
2244         if (!sip || !bond_has_this_ip(bond, tip)) {
2245                 pr_debug("bva: sip %pI4 tip %pI4 not found\n", &sip, &tip);
2246                 return;
2247         }
2248
2249         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2250         if (i == -1) {
2251                 pr_debug("bva: sip %pI4 not found in targets\n", &sip);
2252                 return;
2253         }
2254         slave->last_arp_rx = jiffies;
2255         slave->target_last_arp_rx[i] = jiffies;
2256 }
2257
2258 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2259                  struct slave *slave)
2260 {
2261         struct arphdr *arp = (struct arphdr *)skb->data;
2262         unsigned char *arp_ptr;
2263         __be32 sip, tip;
2264         int alen;
2265
2266         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2267                 return RX_HANDLER_ANOTHER;
2268
2269         read_lock(&bond->lock);
2270
2271         if (!slave_do_arp_validate(bond, slave))
2272                 goto out_unlock;
2273
2274         alen = arp_hdr_len(bond->dev);
2275
2276         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2277                  bond->dev->name, skb->dev->name);
2278
2279         if (alen > skb_headlen(skb)) {
2280                 arp = kmalloc(alen, GFP_ATOMIC);
2281                 if (!arp)
2282                         goto out_unlock;
2283                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2284                         goto out_unlock;
2285         }
2286
2287         if (arp->ar_hln != bond->dev->addr_len ||
2288             skb->pkt_type == PACKET_OTHERHOST ||
2289             skb->pkt_type == PACKET_LOOPBACK ||
2290             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2291             arp->ar_pro != htons(ETH_P_IP) ||
2292             arp->ar_pln != 4)
2293                 goto out_unlock;
2294
2295         arp_ptr = (unsigned char *)(arp + 1);
2296         arp_ptr += bond->dev->addr_len;
2297         memcpy(&sip, arp_ptr, 4);
2298         arp_ptr += 4 + bond->dev->addr_len;
2299         memcpy(&tip, arp_ptr, 4);
2300
2301         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2302                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2303                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2304                  &sip, &tip);
2305
2306         /*
2307          * Backup slaves won't see the ARP reply, but do come through
2308          * here for each ARP probe (so we swap the sip/tip to validate
2309          * the probe).  In a "redundant switch, common router" type of
2310          * configuration, the ARP probe will (hopefully) travel from
2311          * the active, through one switch, the router, then the other
2312          * switch before reaching the backup.
2313          *
2314          * We 'trust' the arp requests if there is an active slave and
2315          * it received valid arp reply(s) after it became active. This
2316          * is done to avoid endless looping when we can't reach the
2317          * arp_ip_target and fool ourselves with our own arp requests.
2318          */
2319         if (bond_is_active_slave(slave))
2320                 bond_validate_arp(bond, slave, sip, tip);
2321         else if (bond->curr_active_slave &&
2322                  time_after(slave_last_rx(bond, bond->curr_active_slave),
2323                             bond->curr_active_slave->jiffies))
2324                 bond_validate_arp(bond, slave, tip, sip);
2325
2326 out_unlock:
2327         read_unlock(&bond->lock);
2328         if (arp != (struct arphdr *)skb->data)
2329                 kfree(arp);
2330         return RX_HANDLER_ANOTHER;
2331 }
2332
2333 /* function to verify if we're in the arp_interval timeslice, returns true if
2334  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2335  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2336  */
2337 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2338                                   int mod)
2339 {
2340         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2341
2342         return time_in_range(jiffies,
2343                              last_act - delta_in_ticks,
2344                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2345 }
2346
2347 /*
2348  * this function is called regularly to monitor each slave's link
2349  * ensuring that traffic is being sent and received when arp monitoring
2350  * is used in load-balancing mode. if the adapter has been dormant, then an
2351  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2352  * arp monitoring in active backup mode.
2353  */
2354 static void bond_loadbalance_arp_mon(struct work_struct *work)
2355 {
2356         struct bonding *bond = container_of(work, struct bonding,
2357                                             arp_work.work);
2358         struct slave *slave, *oldcurrent;
2359         struct list_head *iter;
2360         int do_failover = 0, slave_state_changed = 0;
2361
2362         if (!bond_has_slaves(bond))
2363                 goto re_arm;
2364
2365         rcu_read_lock();
2366
2367         oldcurrent = ACCESS_ONCE(bond->curr_active_slave);
2368         /* see if any of the previous devices are up now (i.e. they have
2369          * xmt and rcv traffic). the curr_active_slave does not come into
2370          * the picture unless it is null. also, slave->jiffies is not needed
2371          * here because we send an arp on each slave and give a slave as
2372          * long as it needs to get the tx/rx within the delta.
2373          * TODO: what about up/down delay in arp mode? it wasn't here before
2374          *       so it can wait
2375          */
2376         bond_for_each_slave_rcu(bond, slave, iter) {
2377                 unsigned long trans_start = dev_trans_start(slave->dev);
2378
2379                 if (slave->link != BOND_LINK_UP) {
2380                         if (bond_time_in_interval(bond, trans_start, 1) &&
2381                             bond_time_in_interval(bond, slave->dev->last_rx, 1)) {
2382
2383                                 slave->link  = BOND_LINK_UP;
2384                                 slave_state_changed = 1;
2385
2386                                 /* primary_slave has no meaning in round-robin
2387                                  * mode. the window of a slave being up and
2388                                  * curr_active_slave being null after enslaving
2389                                  * is closed.
2390                                  */
2391                                 if (!oldcurrent) {
2392                                         pr_info("%s: link status definitely up for interface %s, ",
2393                                                 bond->dev->name,
2394                                                 slave->dev->name);
2395                                         do_failover = 1;
2396                                 } else {
2397                                         pr_info("%s: interface %s is now up\n",
2398                                                 bond->dev->name,
2399                                                 slave->dev->name);
2400                                 }
2401                         }
2402                 } else {
2403                         /* slave->link == BOND_LINK_UP */
2404
2405                         /* not all switches will respond to an arp request
2406                          * when the source ip is 0, so don't take the link down
2407                          * if we don't know our ip yet
2408                          */
2409                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2410                             !bond_time_in_interval(bond, slave->dev->last_rx, 2)) {
2411
2412                                 slave->link  = BOND_LINK_DOWN;
2413                                 slave_state_changed = 1;
2414
2415                                 if (slave->link_failure_count < UINT_MAX)
2416                                         slave->link_failure_count++;
2417
2418                                 pr_info("%s: interface %s is now down.\n",
2419                                         bond->dev->name,
2420                                         slave->dev->name);
2421
2422                                 if (slave == oldcurrent)
2423                                         do_failover = 1;
2424                         }
2425                 }
2426
2427                 /* note: if switch is in round-robin mode, all links
2428                  * must tx arp to ensure all links rx an arp - otherwise
2429                  * links may oscillate or not come up at all; if switch is
2430                  * in something like xor mode, there is nothing we can
2431                  * do - all replies will be rx'ed on same link causing slaves
2432                  * to be unstable during low/no traffic periods
2433                  */
2434                 if (IS_UP(slave->dev))
2435                         bond_arp_send_all(bond, slave);
2436         }
2437
2438         rcu_read_unlock();
2439
2440         if (do_failover || slave_state_changed) {
2441                 if (!rtnl_trylock())
2442                         goto re_arm;
2443
2444                 if (slave_state_changed) {
2445                         bond_slave_state_change(bond);
2446                 } else if (do_failover) {
2447                         /* the bond_select_active_slave must hold RTNL
2448                          * and curr_slave_lock for write.
2449                          */
2450                         block_netpoll_tx();
2451                         write_lock_bh(&bond->curr_slave_lock);
2452
2453                         bond_select_active_slave(bond);
2454
2455                         write_unlock_bh(&bond->curr_slave_lock);
2456                         unblock_netpoll_tx();
2457                 }
2458                 rtnl_unlock();
2459         }
2460
2461 re_arm:
2462         if (bond->params.arp_interval)
2463                 queue_delayed_work(bond->wq, &bond->arp_work,
2464                                    msecs_to_jiffies(bond->params.arp_interval));
2465 }
2466
2467 /*
2468  * Called to inspect slaves for active-backup mode ARP monitor link state
2469  * changes.  Sets new_link in slaves to specify what action should take
2470  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2471  * to link states must be committed.
2472  *
2473  * Called with rcu_read_lock hold.
2474  */
2475 static int bond_ab_arp_inspect(struct bonding *bond)
2476 {
2477         unsigned long trans_start, last_rx;
2478         struct list_head *iter;
2479         struct slave *slave;
2480         int commit = 0;
2481
2482         bond_for_each_slave_rcu(bond, slave, iter) {
2483                 slave->new_link = BOND_LINK_NOCHANGE;
2484                 last_rx = slave_last_rx(bond, slave);
2485
2486                 if (slave->link != BOND_LINK_UP) {
2487                         if (bond_time_in_interval(bond, last_rx, 1)) {
2488                                 slave->new_link = BOND_LINK_UP;
2489                                 commit++;
2490                         }
2491                         continue;
2492                 }
2493
2494                 /*
2495                  * Give slaves 2*delta after being enslaved or made
2496                  * active.  This avoids bouncing, as the last receive
2497                  * times need a full ARP monitor cycle to be updated.
2498                  */
2499                 if (bond_time_in_interval(bond, slave->jiffies, 2))
2500                         continue;
2501
2502                 /*
2503                  * Backup slave is down if:
2504                  * - No current_arp_slave AND
2505                  * - more than 3*delta since last receive AND
2506                  * - the bond has an IP address
2507                  *
2508                  * Note: a non-null current_arp_slave indicates
2509                  * the curr_active_slave went down and we are
2510                  * searching for a new one; under this condition
2511                  * we only take the curr_active_slave down - this
2512                  * gives each slave a chance to tx/rx traffic
2513                  * before being taken out
2514                  */
2515                 if (!bond_is_active_slave(slave) &&
2516                     !bond->current_arp_slave &&
2517                     !bond_time_in_interval(bond, last_rx, 3)) {
2518                         slave->new_link = BOND_LINK_DOWN;
2519                         commit++;
2520                 }
2521
2522                 /*
2523                  * Active slave is down if:
2524                  * - more than 2*delta since transmitting OR
2525                  * - (more than 2*delta since receive AND
2526                  *    the bond has an IP address)
2527                  */
2528                 trans_start = dev_trans_start(slave->dev);
2529                 if (bond_is_active_slave(slave) &&
2530                     (!bond_time_in_interval(bond, trans_start, 2) ||
2531                      !bond_time_in_interval(bond, last_rx, 2))) {
2532                         slave->new_link = BOND_LINK_DOWN;
2533                         commit++;
2534                 }
2535         }
2536
2537         return commit;
2538 }
2539
2540 /*
2541  * Called to commit link state changes noted by inspection step of
2542  * active-backup mode ARP monitor.
2543  *
2544  * Called with RTNL hold.
2545  */
2546 static void bond_ab_arp_commit(struct bonding *bond)
2547 {
2548         unsigned long trans_start;
2549         struct list_head *iter;
2550         struct slave *slave;
2551
2552         bond_for_each_slave(bond, slave, iter) {
2553                 switch (slave->new_link) {
2554                 case BOND_LINK_NOCHANGE:
2555                         continue;
2556
2557                 case BOND_LINK_UP:
2558                         trans_start = dev_trans_start(slave->dev);
2559                         if (bond->curr_active_slave != slave ||
2560                             (!bond->curr_active_slave &&
2561                              bond_time_in_interval(bond, trans_start, 1))) {
2562                                 slave->link = BOND_LINK_UP;
2563                                 if (bond->current_arp_slave) {
2564                                         bond_set_slave_inactive_flags(
2565                                                 bond->current_arp_slave);
2566                                         bond->current_arp_slave = NULL;
2567                                 }
2568
2569                                 pr_info("%s: link status definitely up for interface %s.\n",
2570                                         bond->dev->name, slave->dev->name);
2571
2572                                 if (!bond->curr_active_slave ||
2573                                     (slave == bond->primary_slave))
2574                                         goto do_failover;
2575
2576                         }
2577
2578                         continue;
2579
2580                 case BOND_LINK_DOWN:
2581                         if (slave->link_failure_count < UINT_MAX)
2582                                 slave->link_failure_count++;
2583
2584                         slave->link = BOND_LINK_DOWN;
2585                         bond_set_slave_inactive_flags(slave);
2586
2587                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2588                                 bond->dev->name, slave->dev->name);
2589
2590                         if (slave == bond->curr_active_slave) {
2591                                 bond->current_arp_slave = NULL;
2592                                 goto do_failover;
2593                         }
2594
2595                         continue;
2596
2597                 default:
2598                         pr_err("%s: impossible: new_link %d on slave %s\n",
2599                                bond->dev->name, slave->new_link,
2600                                slave->dev->name);
2601                         continue;
2602                 }
2603
2604 do_failover:
2605                 ASSERT_RTNL();
2606                 block_netpoll_tx();
2607                 write_lock_bh(&bond->curr_slave_lock);
2608                 bond_select_active_slave(bond);
2609                 write_unlock_bh(&bond->curr_slave_lock);
2610                 unblock_netpoll_tx();
2611         }
2612
2613         bond_set_carrier(bond);
2614 }
2615
2616 /*
2617  * Send ARP probes for active-backup mode ARP monitor.
2618  */
2619 static bool bond_ab_arp_probe(struct bonding *bond)
2620 {
2621         struct slave *slave, *before = NULL, *new_slave = NULL,
2622                      *curr_arp_slave, *curr_active_slave;
2623         struct list_head *iter;
2624         bool found = false;
2625
2626         rcu_read_lock();
2627         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2628         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2629
2630         if (curr_arp_slave && curr_active_slave)
2631                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
2632                         curr_arp_slave->dev->name,
2633                         curr_active_slave->dev->name);
2634
2635         if (curr_active_slave) {
2636                 bond_arp_send_all(bond, curr_active_slave);
2637                 rcu_read_unlock();
2638                 return true;
2639         }
2640         rcu_read_unlock();
2641
2642         /* if we don't have a curr_active_slave, search for the next available
2643          * backup slave from the current_arp_slave and make it the candidate
2644          * for becoming the curr_active_slave
2645          */
2646
2647         if (!rtnl_trylock())
2648                 return false;
2649         /* curr_arp_slave might have gone away */
2650         curr_arp_slave = ACCESS_ONCE(bond->current_arp_slave);
2651
2652         if (!curr_arp_slave) {
2653                 curr_arp_slave = bond_first_slave(bond);
2654                 if (!curr_arp_slave) {
2655                         rtnl_unlock();
2656                         return true;
2657                 }
2658         }
2659
2660         bond_set_slave_inactive_flags(curr_arp_slave);
2661
2662         bond_for_each_slave(bond, slave, iter) {
2663                 if (!found && !before && IS_UP(slave->dev))
2664                         before = slave;
2665
2666                 if (found && !new_slave && IS_UP(slave->dev))
2667                         new_slave = slave;
2668                 /* if the link state is up at this point, we
2669                  * mark it down - this can happen if we have
2670                  * simultaneous link failures and
2671                  * reselect_active_interface doesn't make this
2672                  * one the current slave so it is still marked
2673                  * up when it is actually down
2674                  */
2675                 if (!IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
2676                         slave->link = BOND_LINK_DOWN;
2677                         if (slave->link_failure_count < UINT_MAX)
2678                                 slave->link_failure_count++;
2679
2680                         bond_set_slave_inactive_flags(slave);
2681
2682                         pr_info("%s: backup interface %s is now down.\n",
2683                                 bond->dev->name, slave->dev->name);
2684                 }
2685                 if (slave == curr_arp_slave)
2686                         found = true;
2687         }
2688
2689         if (!new_slave && before)
2690                 new_slave = before;
2691
2692         if (!new_slave) {
2693                 rtnl_unlock();
2694                 return true;
2695         }
2696
2697         new_slave->link = BOND_LINK_BACK;
2698         bond_set_slave_active_flags(new_slave);
2699         bond_arp_send_all(bond, new_slave);
2700         new_slave->jiffies = jiffies;
2701         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2702         rtnl_unlock();
2703
2704         return true;
2705 }
2706
2707 static void bond_activebackup_arp_mon(struct work_struct *work)
2708 {
2709         struct bonding *bond = container_of(work, struct bonding,
2710                                             arp_work.work);
2711         bool should_notify_peers = false, should_commit = false;
2712         int delta_in_ticks;
2713
2714         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2715
2716         if (!bond_has_slaves(bond))
2717                 goto re_arm;
2718
2719         rcu_read_lock();
2720         should_notify_peers = bond_should_notify_peers(bond);
2721         should_commit = bond_ab_arp_inspect(bond);
2722         rcu_read_unlock();
2723
2724         if (should_commit) {
2725                 /* Race avoidance with bond_close flush of workqueue */
2726                 if (!rtnl_trylock()) {
2727                         delta_in_ticks = 1;
2728                         should_notify_peers = false;
2729                         goto re_arm;
2730                 }
2731
2732                 bond_ab_arp_commit(bond);
2733                 rtnl_unlock();
2734         }
2735
2736         if (!bond_ab_arp_probe(bond)) {
2737                 /* rtnl locking failed, re-arm */
2738                 delta_in_ticks = 1;
2739                 should_notify_peers = false;
2740         }
2741
2742 re_arm:
2743         if (bond->params.arp_interval)
2744                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2745
2746         if (should_notify_peers) {
2747                 if (!rtnl_trylock())
2748                         return;
2749                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2750                 rtnl_unlock();
2751         }
2752 }
2753
2754 /*-------------------------- netdev event handling --------------------------*/
2755
2756 /*
2757  * Change device name
2758  */
2759 static int bond_event_changename(struct bonding *bond)
2760 {
2761         bond_remove_proc_entry(bond);
2762         bond_create_proc_entry(bond);
2763
2764         bond_debug_reregister(bond);
2765
2766         return NOTIFY_DONE;
2767 }
2768
2769 static int bond_master_netdev_event(unsigned long event,
2770                                     struct net_device *bond_dev)
2771 {
2772         struct bonding *event_bond = netdev_priv(bond_dev);
2773
2774         switch (event) {
2775         case NETDEV_CHANGENAME:
2776                 return bond_event_changename(event_bond);
2777         case NETDEV_UNREGISTER:
2778                 bond_remove_proc_entry(event_bond);
2779                 break;
2780         case NETDEV_REGISTER:
2781                 bond_create_proc_entry(event_bond);
2782                 break;
2783         case NETDEV_NOTIFY_PEERS:
2784                 if (event_bond->send_peer_notif)
2785                         event_bond->send_peer_notif--;
2786                 break;
2787         default:
2788                 break;
2789         }
2790
2791         return NOTIFY_DONE;
2792 }
2793
2794 static int bond_slave_netdev_event(unsigned long event,
2795                                    struct net_device *slave_dev)
2796 {
2797         struct slave *slave = bond_slave_get_rtnl(slave_dev);
2798         struct bonding *bond;
2799         struct net_device *bond_dev;
2800         u32 old_speed;
2801         u8 old_duplex;
2802
2803         /* A netdev event can be generated while enslaving a device
2804          * before netdev_rx_handler_register is called in which case
2805          * slave will be NULL
2806          */
2807         if (!slave)
2808                 return NOTIFY_DONE;
2809         bond_dev = slave->bond->dev;
2810         bond = slave->bond;
2811
2812         switch (event) {
2813         case NETDEV_UNREGISTER:
2814                 if (bond_dev->type != ARPHRD_ETHER)
2815                         bond_release_and_destroy(bond_dev, slave_dev);
2816                 else
2817                         bond_release(bond_dev, slave_dev);
2818                 break;
2819         case NETDEV_UP:
2820         case NETDEV_CHANGE:
2821                 old_speed = slave->speed;
2822                 old_duplex = slave->duplex;
2823
2824                 bond_update_speed_duplex(slave);
2825
2826                 if (bond->params.mode == BOND_MODE_8023AD) {
2827                         if (old_speed != slave->speed)
2828                                 bond_3ad_adapter_speed_changed(slave);
2829                         if (old_duplex != slave->duplex)
2830                                 bond_3ad_adapter_duplex_changed(slave);
2831                 }
2832                 break;
2833         case NETDEV_DOWN:
2834                 /*
2835                  * ... Or is it this?
2836                  */
2837                 break;
2838         case NETDEV_CHANGEMTU:
2839                 /*
2840                  * TODO: Should slaves be allowed to
2841                  * independently alter their MTU?  For
2842                  * an active-backup bond, slaves need
2843                  * not be the same type of device, so
2844                  * MTUs may vary.  For other modes,
2845                  * slaves arguably should have the
2846                  * same MTUs. To do this, we'd need to
2847                  * take over the slave's change_mtu
2848                  * function for the duration of their
2849                  * servitude.
2850                  */
2851                 break;
2852         case NETDEV_CHANGENAME:
2853                 /* we don't care if we don't have primary set */
2854                 if (!USES_PRIMARY(bond->params.mode) ||
2855                     !bond->params.primary[0])
2856                         break;
2857
2858                 if (slave == bond->primary_slave) {
2859                         /* slave's name changed - he's no longer primary */
2860                         bond->primary_slave = NULL;
2861                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
2862                         /* we have a new primary slave */
2863                         bond->primary_slave = slave;
2864                 } else { /* we didn't change primary - exit */
2865                         break;
2866                 }
2867
2868                 pr_info("%s: Primary slave changed to %s, reselecting active slave.\n",
2869                         bond->dev->name, bond->primary_slave ? slave_dev->name :
2870                                                                "none");
2871
2872                 block_netpoll_tx();
2873                 write_lock_bh(&bond->curr_slave_lock);
2874                 bond_select_active_slave(bond);
2875                 write_unlock_bh(&bond->curr_slave_lock);
2876                 unblock_netpoll_tx();
2877                 break;
2878         case NETDEV_FEAT_CHANGE:
2879                 bond_compute_features(bond);
2880                 break;
2881         case NETDEV_RESEND_IGMP:
2882                 /* Propagate to master device */
2883                 call_netdevice_notifiers(event, slave->bond->dev);
2884                 break;
2885         default:
2886                 break;
2887         }
2888
2889         return NOTIFY_DONE;
2890 }
2891
2892 /*
2893  * bond_netdev_event: handle netdev notifier chain events.
2894  *
2895  * This function receives events for the netdev chain.  The caller (an
2896  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
2897  * locks for us to safely manipulate the slave devices (RTNL lock,
2898  * dev_probe_lock).
2899  */
2900 static int bond_netdev_event(struct notifier_block *this,
2901                              unsigned long event, void *ptr)
2902 {
2903         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2904
2905         pr_debug("event_dev: %s, event: %lx\n",
2906                  event_dev ? event_dev->name : "None",
2907                  event);
2908
2909         if (!(event_dev->priv_flags & IFF_BONDING))
2910                 return NOTIFY_DONE;
2911
2912         if (event_dev->flags & IFF_MASTER) {
2913                 pr_debug("IFF_MASTER\n");
2914                 return bond_master_netdev_event(event, event_dev);
2915         }
2916
2917         if (event_dev->flags & IFF_SLAVE) {
2918                 pr_debug("IFF_SLAVE\n");
2919                 return bond_slave_netdev_event(event, event_dev);
2920         }
2921
2922         return NOTIFY_DONE;
2923 }
2924
2925 static struct notifier_block bond_netdev_notifier = {
2926         .notifier_call = bond_netdev_event,
2927 };
2928
2929 /*---------------------------- Hashing Policies -----------------------------*/
2930
2931 /* L2 hash helper */
2932 static inline u32 bond_eth_hash(struct sk_buff *skb)
2933 {
2934         struct ethhdr *data = (struct ethhdr *)skb->data;
2935
2936         if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
2937                 return data->h_dest[5] ^ data->h_source[5];
2938
2939         return 0;
2940 }
2941
2942 /* Extract the appropriate headers based on bond's xmit policy */
2943 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
2944                               struct flow_keys *fk)
2945 {
2946         const struct ipv6hdr *iph6;
2947         const struct iphdr *iph;
2948         int noff, proto = -1;
2949
2950         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
2951                 return skb_flow_dissect(skb, fk);
2952
2953         fk->ports = 0;
2954         noff = skb_network_offset(skb);
2955         if (skb->protocol == htons(ETH_P_IP)) {
2956                 if (!pskb_may_pull(skb, noff + sizeof(*iph)))
2957                         return false;
2958                 iph = ip_hdr(skb);
2959                 fk->src = iph->saddr;
2960                 fk->dst = iph->daddr;
2961                 noff += iph->ihl << 2;
2962                 if (!ip_is_fragment(iph))
2963                         proto = iph->protocol;
2964         } else if (skb->protocol == htons(ETH_P_IPV6)) {
2965                 if (!pskb_may_pull(skb, noff + sizeof(*iph6)))
2966                         return false;
2967                 iph6 = ipv6_hdr(skb);
2968                 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
2969                 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
2970                 noff += sizeof(*iph6);
2971                 proto = iph6->nexthdr;
2972         } else {
2973                 return false;
2974         }
2975         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
2976                 fk->ports = skb_flow_get_ports(skb, noff, proto);
2977
2978         return true;
2979 }
2980
2981 /**
2982  * bond_xmit_hash - generate a hash value based on the xmit policy
2983  * @bond: bonding device
2984  * @skb: buffer to use for headers
2985  * @count: modulo value
2986  *
2987  * This function will extract the necessary headers from the skb buffer and use
2988  * them to generate a hash based on the xmit_policy set in the bonding device
2989  * which will be reduced modulo count before returning.
2990  */
2991 int bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, int count)
2992 {
2993         struct flow_keys flow;
2994         u32 hash;
2995
2996         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
2997             !bond_flow_dissect(bond, skb, &flow))
2998                 return bond_eth_hash(skb) % count;
2999
3000         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3001             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3002                 hash = bond_eth_hash(skb);
3003         else
3004                 hash = (__force u32)flow.ports;
3005         hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
3006         hash ^= (hash >> 16);
3007         hash ^= (hash >> 8);
3008
3009         return hash % count;
3010 }
3011
3012 /*-------------------------- Device entry points ----------------------------*/
3013
3014 static void bond_work_init_all(struct bonding *bond)
3015 {
3016         INIT_DELAYED_WORK(&bond->mcast_work,
3017                           bond_resend_igmp_join_requests_delayed);
3018         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3019         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3020         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3021                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3022         else
3023                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3024         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3025 }
3026
3027 static void bond_work_cancel_all(struct bonding *bond)
3028 {
3029         cancel_delayed_work_sync(&bond->mii_work);
3030         cancel_delayed_work_sync(&bond->arp_work);
3031         cancel_delayed_work_sync(&bond->alb_work);
3032         cancel_delayed_work_sync(&bond->ad_work);
3033         cancel_delayed_work_sync(&bond->mcast_work);
3034 }
3035
3036 static int bond_open(struct net_device *bond_dev)
3037 {
3038         struct bonding *bond = netdev_priv(bond_dev);
3039         struct list_head *iter;
3040         struct slave *slave;
3041
3042         /* reset slave->backup and slave->inactive */
3043         read_lock(&bond->lock);
3044         if (bond_has_slaves(bond)) {
3045                 read_lock(&bond->curr_slave_lock);
3046                 bond_for_each_slave(bond, slave, iter) {
3047                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3048                                 && (slave != bond->curr_active_slave)) {
3049                                 bond_set_slave_inactive_flags(slave);
3050                         } else {
3051                                 bond_set_slave_active_flags(slave);
3052                         }
3053                 }
3054                 read_unlock(&bond->curr_slave_lock);
3055         }
3056         read_unlock(&bond->lock);
3057
3058         bond_work_init_all(bond);
3059
3060         if (bond_is_lb(bond)) {
3061                 /* bond_alb_initialize must be called before the timer
3062                  * is started.
3063                  */
3064                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3065                         return -ENOMEM;
3066                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3067         }
3068
3069         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3070                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3071
3072         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3073                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3074                 if (bond->params.arp_validate)
3075                         bond->recv_probe = bond_arp_rcv;
3076         }
3077
3078         if (bond->params.mode == BOND_MODE_8023AD) {
3079                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3080                 /* register to receive LACPDUs */
3081                 bond->recv_probe = bond_3ad_lacpdu_recv;
3082                 bond_3ad_initiate_agg_selection(bond, 1);
3083         }
3084
3085         return 0;
3086 }
3087
3088 static int bond_close(struct net_device *bond_dev)
3089 {
3090         struct bonding *bond = netdev_priv(bond_dev);
3091
3092         bond_work_cancel_all(bond);
3093         bond->send_peer_notif = 0;
3094         if (bond_is_lb(bond))
3095                 bond_alb_deinitialize(bond);
3096         bond->recv_probe = NULL;
3097
3098         return 0;
3099 }
3100
3101 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3102                                                 struct rtnl_link_stats64 *stats)
3103 {
3104         struct bonding *bond = netdev_priv(bond_dev);
3105         struct rtnl_link_stats64 temp;
3106         struct list_head *iter;
3107         struct slave *slave;
3108
3109         memset(stats, 0, sizeof(*stats));
3110
3111         read_lock_bh(&bond->lock);
3112         bond_for_each_slave(bond, slave, iter) {
3113                 const struct rtnl_link_stats64 *sstats =
3114                         dev_get_stats(slave->dev, &temp);
3115
3116                 stats->rx_packets += sstats->rx_packets;
3117                 stats->rx_bytes += sstats->rx_bytes;
3118                 stats->rx_errors += sstats->rx_errors;
3119                 stats->rx_dropped += sstats->rx_dropped;
3120
3121                 stats->tx_packets += sstats->tx_packets;
3122                 stats->tx_bytes += sstats->tx_bytes;
3123                 stats->tx_errors += sstats->tx_errors;
3124                 stats->tx_dropped += sstats->tx_dropped;
3125
3126                 stats->multicast += sstats->multicast;
3127                 stats->collisions += sstats->collisions;
3128
3129                 stats->rx_length_errors += sstats->rx_length_errors;
3130                 stats->rx_over_errors += sstats->rx_over_errors;
3131                 stats->rx_crc_errors += sstats->rx_crc_errors;
3132                 stats->rx_frame_errors += sstats->rx_frame_errors;
3133                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3134                 stats->rx_missed_errors += sstats->rx_missed_errors;
3135
3136                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3137                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3138                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3139                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3140                 stats->tx_window_errors += sstats->tx_window_errors;
3141         }
3142         read_unlock_bh(&bond->lock);
3143
3144         return stats;
3145 }
3146
3147 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3148 {
3149         struct bonding *bond = netdev_priv(bond_dev);
3150         struct net_device *slave_dev = NULL;
3151         struct ifbond k_binfo;
3152         struct ifbond __user *u_binfo = NULL;
3153         struct ifslave k_sinfo;
3154         struct ifslave __user *u_sinfo = NULL;
3155         struct mii_ioctl_data *mii = NULL;
3156         struct bond_opt_value newval;
3157         struct net *net;
3158         int res = 0;
3159
3160         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3161
3162         switch (cmd) {
3163         case SIOCGMIIPHY:
3164                 mii = if_mii(ifr);
3165                 if (!mii)
3166                         return -EINVAL;
3167
3168                 mii->phy_id = 0;
3169                 /* Fall Through */
3170         case SIOCGMIIREG:
3171                 /*
3172                  * We do this again just in case we were called by SIOCGMIIREG
3173                  * instead of SIOCGMIIPHY.
3174                  */
3175                 mii = if_mii(ifr);
3176                 if (!mii)
3177                         return -EINVAL;
3178
3179
3180                 if (mii->reg_num == 1) {
3181                         mii->val_out = 0;
3182                         read_lock(&bond->lock);
3183                         read_lock(&bond->curr_slave_lock);
3184                         if (netif_carrier_ok(bond->dev))
3185                                 mii->val_out = BMSR_LSTATUS;
3186
3187                         read_unlock(&bond->curr_slave_lock);
3188                         read_unlock(&bond->lock);
3189                 }
3190
3191                 return 0;
3192         case BOND_INFO_QUERY_OLD:
3193         case SIOCBONDINFOQUERY:
3194                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3195
3196                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3197                         return -EFAULT;
3198
3199                 res = bond_info_query(bond_dev, &k_binfo);
3200                 if (res == 0 &&
3201                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3202                         return -EFAULT;
3203
3204                 return res;
3205         case BOND_SLAVE_INFO_QUERY_OLD:
3206         case SIOCBONDSLAVEINFOQUERY:
3207                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3208
3209                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3210                         return -EFAULT;
3211
3212                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3213                 if (res == 0 &&
3214                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3215                         return -EFAULT;
3216
3217                 return res;
3218         default:
3219                 /* Go on */
3220                 break;
3221         }
3222
3223         net = dev_net(bond_dev);
3224
3225         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3226                 return -EPERM;
3227
3228         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3229
3230         pr_debug("slave_dev=%p:\n", slave_dev);
3231
3232         if (!slave_dev)
3233                 return -ENODEV;
3234
3235         pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3236         switch (cmd) {
3237         case BOND_ENSLAVE_OLD:
3238         case SIOCBONDENSLAVE:
3239                 res = bond_enslave(bond_dev, slave_dev);
3240                 break;
3241         case BOND_RELEASE_OLD:
3242         case SIOCBONDRELEASE:
3243                 res = bond_release(bond_dev, slave_dev);
3244                 break;
3245         case BOND_SETHWADDR_OLD:
3246         case SIOCBONDSETHWADDR:
3247                 bond_set_dev_addr(bond_dev, slave_dev);
3248                 res = 0;
3249                 break;
3250         case BOND_CHANGE_ACTIVE_OLD:
3251         case SIOCBONDCHANGEACTIVE:
3252                 bond_opt_initstr(&newval, slave_dev->name);
3253                 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3254                 break;
3255         default:
3256                 res = -EOPNOTSUPP;
3257         }
3258
3259         return res;
3260 }
3261
3262 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3263 {
3264         struct bonding *bond = netdev_priv(bond_dev);
3265
3266         if (change & IFF_PROMISC)
3267                 bond_set_promiscuity(bond,
3268                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3269
3270         if (change & IFF_ALLMULTI)
3271                 bond_set_allmulti(bond,
3272                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3273 }
3274
3275 static void bond_set_rx_mode(struct net_device *bond_dev)
3276 {
3277         struct bonding *bond = netdev_priv(bond_dev);
3278         struct list_head *iter;
3279         struct slave *slave;
3280
3281
3282         rcu_read_lock();
3283         if (USES_PRIMARY(bond->params.mode)) {
3284                 slave = rcu_dereference(bond->curr_active_slave);
3285                 if (slave) {
3286                         dev_uc_sync(slave->dev, bond_dev);
3287                         dev_mc_sync(slave->dev, bond_dev);
3288                 }
3289         } else {
3290                 bond_for_each_slave_rcu(bond, slave, iter) {
3291                         dev_uc_sync_multiple(slave->dev, bond_dev);
3292                         dev_mc_sync_multiple(slave->dev, bond_dev);
3293                 }
3294         }
3295         rcu_read_unlock();
3296 }
3297
3298 static int bond_neigh_init(struct neighbour *n)
3299 {
3300         struct bonding *bond = netdev_priv(n->dev);
3301         const struct net_device_ops *slave_ops;
3302         struct neigh_parms parms;
3303         struct slave *slave;
3304         int ret;
3305
3306         slave = bond_first_slave(bond);
3307         if (!slave)
3308                 return 0;
3309         slave_ops = slave->dev->netdev_ops;
3310         if (!slave_ops->ndo_neigh_setup)
3311                 return 0;
3312
3313         parms.neigh_setup = NULL;
3314         parms.neigh_cleanup = NULL;
3315         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3316         if (ret)
3317                 return ret;
3318
3319         /*
3320          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3321          * after the last slave has been detached.  Assumes that all slaves
3322          * utilize the same neigh_cleanup (true at this writing as only user
3323          * is ipoib).
3324          */
3325         n->parms->neigh_cleanup = parms.neigh_cleanup;
3326
3327         if (!parms.neigh_setup)
3328                 return 0;
3329
3330         return parms.neigh_setup(n);
3331 }
3332
3333 /*
3334  * The bonding ndo_neigh_setup is called at init time beofre any
3335  * slave exists. So we must declare proxy setup function which will
3336  * be used at run time to resolve the actual slave neigh param setup.
3337  *
3338  * It's also called by master devices (such as vlans) to setup their
3339  * underlying devices. In that case - do nothing, we're already set up from
3340  * our init.
3341  */
3342 static int bond_neigh_setup(struct net_device *dev,
3343                             struct neigh_parms *parms)
3344 {
3345         /* modify only our neigh_parms */
3346         if (parms->dev == dev)
3347                 parms->neigh_setup = bond_neigh_init;
3348
3349         return 0;
3350 }
3351
3352 /*
3353  * Change the MTU of all of a master's slaves to match the master
3354  */
3355 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3356 {
3357         struct bonding *bond = netdev_priv(bond_dev);
3358         struct slave *slave, *rollback_slave;
3359         struct list_head *iter;
3360         int res = 0;
3361
3362         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3363                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3364
3365         /* Can't hold bond->lock with bh disabled here since
3366          * some base drivers panic. On the other hand we can't
3367          * hold bond->lock without bh disabled because we'll
3368          * deadlock. The only solution is to rely on the fact
3369          * that we're under rtnl_lock here, and the slaves
3370          * list won't change. This doesn't solve the problem
3371          * of setting the slave's MTU while it is
3372          * transmitting, but the assumption is that the base
3373          * driver can handle that.
3374          *
3375          * TODO: figure out a way to safely iterate the slaves
3376          * list, but without holding a lock around the actual
3377          * call to the base driver.
3378          */
3379
3380         bond_for_each_slave(bond, slave, iter) {
3381                 pr_debug("s %p c_m %p\n",
3382                          slave,
3383                          slave->dev->netdev_ops->ndo_change_mtu);
3384
3385                 res = dev_set_mtu(slave->dev, new_mtu);
3386
3387                 if (res) {
3388                         /* If we failed to set the slave's mtu to the new value
3389                          * we must abort the operation even in ACTIVE_BACKUP
3390                          * mode, because if we allow the backup slaves to have
3391                          * different mtu values than the active slave we'll
3392                          * need to change their mtu when doing a failover. That
3393                          * means changing their mtu from timer context, which
3394                          * is probably not a good idea.
3395                          */
3396                         pr_debug("err %d %s\n", res, slave->dev->name);
3397                         goto unwind;
3398                 }
3399         }
3400
3401         bond_dev->mtu = new_mtu;
3402
3403         return 0;
3404
3405 unwind:
3406         /* unwind from head to the slave that failed */
3407         bond_for_each_slave(bond, rollback_slave, iter) {
3408                 int tmp_res;
3409
3410                 if (rollback_slave == slave)
3411                         break;
3412
3413                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3414                 if (tmp_res) {
3415                         pr_debug("unwind err %d dev %s\n",
3416                                  tmp_res, rollback_slave->dev->name);
3417                 }
3418         }
3419
3420         return res;
3421 }
3422
3423 /*
3424  * Change HW address
3425  *
3426  * Note that many devices must be down to change the HW address, and
3427  * downing the master releases all slaves.  We can make bonds full of
3428  * bonding devices to test this, however.
3429  */
3430 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3431 {
3432         struct bonding *bond = netdev_priv(bond_dev);
3433         struct slave *slave, *rollback_slave;
3434         struct sockaddr *sa = addr, tmp_sa;
3435         struct list_head *iter;
3436         int res = 0;
3437
3438         if (bond->params.mode == BOND_MODE_ALB)
3439                 return bond_alb_set_mac_address(bond_dev, addr);
3440
3441
3442         pr_debug("bond=%p, name=%s\n",
3443                  bond, bond_dev ? bond_dev->name : "None");
3444
3445         /* If fail_over_mac is enabled, do nothing and return success.
3446          * Returning an error causes ifenslave to fail.
3447          */
3448         if (bond->params.fail_over_mac &&
3449             bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3450                 return 0;
3451
3452         if (!is_valid_ether_addr(sa->sa_data))
3453                 return -EADDRNOTAVAIL;
3454
3455         /* Can't hold bond->lock with bh disabled here since
3456          * some base drivers panic. On the other hand we can't
3457          * hold bond->lock without bh disabled because we'll
3458          * deadlock. The only solution is to rely on the fact
3459          * that we're under rtnl_lock here, and the slaves
3460          * list won't change. This doesn't solve the problem
3461          * of setting the slave's hw address while it is
3462          * transmitting, but the assumption is that the base
3463          * driver can handle that.
3464          *
3465          * TODO: figure out a way to safely iterate the slaves
3466          * list, but without holding a lock around the actual
3467          * call to the base driver.
3468          */
3469
3470         bond_for_each_slave(bond, slave, iter) {
3471                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3472                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3473
3474                 if (slave_ops->ndo_set_mac_address == NULL) {
3475                         res = -EOPNOTSUPP;
3476                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3477                         goto unwind;
3478                 }
3479
3480                 res = dev_set_mac_address(slave->dev, addr);
3481                 if (res) {
3482                         /* TODO: consider downing the slave
3483                          * and retry ?
3484                          * User should expect communications
3485                          * breakage anyway until ARP finish
3486                          * updating, so...
3487                          */
3488                         pr_debug("err %d %s\n", res, slave->dev->name);
3489                         goto unwind;
3490                 }
3491         }
3492
3493         /* success */
3494         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3495         return 0;
3496
3497 unwind:
3498         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3499         tmp_sa.sa_family = bond_dev->type;
3500
3501         /* unwind from head to the slave that failed */
3502         bond_for_each_slave(bond, rollback_slave, iter) {
3503                 int tmp_res;
3504
3505                 if (rollback_slave == slave)
3506                         break;
3507
3508                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3509                 if (tmp_res) {
3510                         pr_debug("unwind err %d dev %s\n",
3511                                  tmp_res, rollback_slave->dev->name);
3512                 }
3513         }
3514
3515         return res;
3516 }
3517
3518 /**
3519  * bond_xmit_slave_id - transmit skb through slave with slave_id
3520  * @bond: bonding device that is transmitting
3521  * @skb: buffer to transmit
3522  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3523  *
3524  * This function tries to transmit through slave with slave_id but in case
3525  * it fails, it tries to find the first available slave for transmission.
3526  * The skb is consumed in all cases, thus the function is void.
3527  */
3528 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3529 {
3530         struct list_head *iter;
3531         struct slave *slave;
3532         int i = slave_id;
3533
3534         /* Here we start from the slave with slave_id */
3535         bond_for_each_slave_rcu(bond, slave, iter) {
3536                 if (--i < 0) {
3537                         if (slave_can_tx(slave)) {
3538                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3539                                 return;
3540                         }
3541                 }
3542         }
3543
3544         /* Here we start from the first slave up to slave_id */
3545         i = slave_id;
3546         bond_for_each_slave_rcu(bond, slave, iter) {
3547                 if (--i < 0)
3548                         break;
3549                 if (slave_can_tx(slave)) {
3550                         bond_dev_queue_xmit(bond, skb, slave->dev);
3551                         return;
3552                 }
3553         }
3554         /* no slave that can tx has been found */
3555         kfree_skb(skb);
3556 }
3557
3558 /**
3559  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3560  * @bond: bonding device to use
3561  *
3562  * Based on the value of the bonding device's packets_per_slave parameter
3563  * this function generates a slave id, which is usually used as the next
3564  * slave to transmit through.
3565  */
3566 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3567 {
3568         u32 slave_id;
3569         struct reciprocal_value reciprocal_packets_per_slave;
3570         int packets_per_slave = bond->params.packets_per_slave;
3571
3572         switch (packets_per_slave) {
3573         case 0:
3574                 slave_id = prandom_u32();
3575                 break;
3576         case 1:
3577                 slave_id = bond->rr_tx_counter;
3578                 break;
3579         default:
3580                 reciprocal_packets_per_slave =
3581                         bond->params.reciprocal_packets_per_slave;
3582                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3583                                              reciprocal_packets_per_slave);
3584                 break;
3585         }
3586         bond->rr_tx_counter++;
3587
3588         return slave_id;
3589 }
3590
3591 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3592 {
3593         struct bonding *bond = netdev_priv(bond_dev);
3594         struct iphdr *iph = ip_hdr(skb);
3595         struct slave *slave;
3596         u32 slave_id;
3597
3598         /* Start with the curr_active_slave that joined the bond as the
3599          * default for sending IGMP traffic.  For failover purposes one
3600          * needs to maintain some consistency for the interface that will
3601          * send the join/membership reports.  The curr_active_slave found
3602          * will send all of this type of traffic.
3603          */
3604         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3605                 slave = rcu_dereference(bond->curr_active_slave);
3606                 if (slave && slave_can_tx(slave))
3607                         bond_dev_queue_xmit(bond, skb, slave->dev);
3608                 else
3609                         bond_xmit_slave_id(bond, skb, 0);
3610         } else {
3611                 slave_id = bond_rr_gen_slave_id(bond);
3612                 bond_xmit_slave_id(bond, skb, slave_id % bond->slave_cnt);
3613         }
3614
3615         return NETDEV_TX_OK;
3616 }
3617
3618 /*
3619  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3620  * the bond has a usable interface.
3621  */
3622 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3623 {
3624         struct bonding *bond = netdev_priv(bond_dev);
3625         struct slave *slave;
3626
3627         slave = rcu_dereference(bond->curr_active_slave);
3628         if (slave)
3629                 bond_dev_queue_xmit(bond, skb, slave->dev);
3630         else
3631                 kfree_skb(skb);
3632
3633         return NETDEV_TX_OK;
3634 }
3635
3636 /* In bond_xmit_xor() , we determine the output device by using a pre-
3637  * determined xmit_hash_policy(), If the selected device is not enabled,
3638  * find the next active slave.
3639  */
3640 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3641 {
3642         struct bonding *bond = netdev_priv(bond_dev);
3643
3644         bond_xmit_slave_id(bond, skb, bond_xmit_hash(bond, skb, bond->slave_cnt));
3645
3646         return NETDEV_TX_OK;
3647 }
3648
3649 /* in broadcast mode, we send everything to all usable interfaces. */
3650 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3651 {
3652         struct bonding *bond = netdev_priv(bond_dev);
3653         struct slave *slave = NULL;
3654         struct list_head *iter;
3655
3656         bond_for_each_slave_rcu(bond, slave, iter) {
3657                 if (bond_is_last_slave(bond, slave))
3658                         break;
3659                 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
3660                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3661
3662                         if (!skb2) {
3663                                 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
3664                                        bond_dev->name);
3665                                 continue;
3666                         }
3667                         /* bond_dev_queue_xmit always returns 0 */
3668                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3669                 }
3670         }
3671         if (slave && IS_UP(slave->dev) && slave->link == BOND_LINK_UP)
3672                 bond_dev_queue_xmit(bond, skb, slave->dev);
3673         else
3674                 kfree_skb(skb);
3675
3676         return NETDEV_TX_OK;
3677 }
3678
3679 /*------------------------- Device initialization ---------------------------*/
3680
3681 /*
3682  * Lookup the slave that corresponds to a qid
3683  */
3684 static inline int bond_slave_override(struct bonding *bond,
3685                                       struct sk_buff *skb)
3686 {
3687         struct slave *slave = NULL;
3688         struct list_head *iter;
3689
3690         if (!skb->queue_mapping)
3691                 return 1;
3692
3693         /* Find out if any slaves have the same mapping as this skb. */
3694         bond_for_each_slave_rcu(bond, slave, iter) {
3695                 if (slave->queue_id == skb->queue_mapping) {
3696                         if (slave_can_tx(slave)) {
3697                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3698                                 return 0;
3699                         }
3700                         /* If the slave isn't UP, use default transmit policy. */
3701                         break;
3702                 }
3703         }
3704
3705         return 1;
3706 }
3707
3708
3709 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3710                              void *accel_priv, select_queue_fallback_t fallback)
3711 {
3712         /*
3713          * This helper function exists to help dev_pick_tx get the correct
3714          * destination queue.  Using a helper function skips a call to
3715          * skb_tx_hash and will put the skbs in the queue we expect on their
3716          * way down to the bonding driver.
3717          */
3718         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3719
3720         /*
3721          * Save the original txq to restore before passing to the driver
3722          */
3723         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3724
3725         if (unlikely(txq >= dev->real_num_tx_queues)) {
3726                 do {
3727                         txq -= dev->real_num_tx_queues;
3728                 } while (txq >= dev->real_num_tx_queues);
3729         }
3730         return txq;
3731 }
3732
3733 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3734 {
3735         struct bonding *bond = netdev_priv(dev);
3736
3737         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
3738                 if (!bond_slave_override(bond, skb))
3739                         return NETDEV_TX_OK;
3740         }
3741
3742         switch (bond->params.mode) {
3743         case BOND_MODE_ROUNDROBIN:
3744                 return bond_xmit_roundrobin(skb, dev);
3745         case BOND_MODE_ACTIVEBACKUP:
3746                 return bond_xmit_activebackup(skb, dev);
3747         case BOND_MODE_XOR:
3748                 return bond_xmit_xor(skb, dev);
3749         case BOND_MODE_BROADCAST:
3750                 return bond_xmit_broadcast(skb, dev);
3751         case BOND_MODE_8023AD:
3752                 return bond_3ad_xmit_xor(skb, dev);
3753         case BOND_MODE_ALB:
3754         case BOND_MODE_TLB:
3755                 return bond_alb_xmit(skb, dev);
3756         default:
3757                 /* Should never happen, mode already checked */
3758                 pr_err("%s: Error: Unknown bonding mode %d\n",
3759                        dev->name, bond->params.mode);
3760                 WARN_ON_ONCE(1);
3761                 kfree_skb(skb);
3762                 return NETDEV_TX_OK;
3763         }
3764 }
3765
3766 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3767 {
3768         struct bonding *bond = netdev_priv(dev);
3769         netdev_tx_t ret = NETDEV_TX_OK;
3770
3771         /*
3772          * If we risk deadlock from transmitting this in the
3773          * netpoll path, tell netpoll to queue the frame for later tx
3774          */
3775         if (is_netpoll_tx_blocked(dev))
3776                 return NETDEV_TX_BUSY;
3777
3778         rcu_read_lock();
3779         if (bond_has_slaves(bond))
3780                 ret = __bond_start_xmit(skb, dev);
3781         else
3782                 kfree_skb(skb);
3783         rcu_read_unlock();
3784
3785         return ret;
3786 }
3787
3788 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3789                                      struct ethtool_cmd *ecmd)
3790 {
3791         struct bonding *bond = netdev_priv(bond_dev);
3792         unsigned long speed = 0;
3793         struct list_head *iter;
3794         struct slave *slave;
3795
3796         ecmd->duplex = DUPLEX_UNKNOWN;
3797         ecmd->port = PORT_OTHER;
3798
3799         /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
3800          * do not need to check mode.  Though link speed might not represent
3801          * the true receive or transmit bandwidth (not all modes are symmetric)
3802          * this is an accurate maximum.
3803          */
3804         read_lock(&bond->lock);
3805         bond_for_each_slave(bond, slave, iter) {
3806                 if (SLAVE_IS_OK(slave)) {
3807                         if (slave->speed != SPEED_UNKNOWN)
3808                                 speed += slave->speed;
3809                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
3810                             slave->duplex != DUPLEX_UNKNOWN)
3811                                 ecmd->duplex = slave->duplex;
3812                 }
3813         }
3814         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3815         read_unlock(&bond->lock);
3816
3817         return 0;
3818 }
3819
3820 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3821                                      struct ethtool_drvinfo *drvinfo)
3822 {
3823         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3824         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3825         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3826                  BOND_ABI_VERSION);
3827 }
3828
3829 static const struct ethtool_ops bond_ethtool_ops = {
3830         .get_drvinfo            = bond_ethtool_get_drvinfo,
3831         .get_settings           = bond_ethtool_get_settings,
3832         .get_link               = ethtool_op_get_link,
3833 };
3834
3835 static const struct net_device_ops bond_netdev_ops = {
3836         .ndo_init               = bond_init,
3837         .ndo_uninit             = bond_uninit,
3838         .ndo_open               = bond_open,
3839         .ndo_stop               = bond_close,
3840         .ndo_start_xmit         = bond_start_xmit,
3841         .ndo_select_queue       = bond_select_queue,
3842         .ndo_get_stats64        = bond_get_stats,
3843         .ndo_do_ioctl           = bond_do_ioctl,
3844         .ndo_change_rx_flags    = bond_change_rx_flags,
3845         .ndo_set_rx_mode        = bond_set_rx_mode,
3846         .ndo_change_mtu         = bond_change_mtu,
3847         .ndo_set_mac_address    = bond_set_mac_address,
3848         .ndo_neigh_setup        = bond_neigh_setup,
3849         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
3850         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
3851 #ifdef CONFIG_NET_POLL_CONTROLLER
3852         .ndo_netpoll_setup      = bond_netpoll_setup,
3853         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
3854         .ndo_poll_controller    = bond_poll_controller,
3855 #endif
3856         .ndo_add_slave          = bond_enslave,
3857         .ndo_del_slave          = bond_release,
3858         .ndo_fix_features       = bond_fix_features,
3859 };
3860
3861 static const struct device_type bond_type = {
3862         .name = "bond",
3863 };
3864
3865 static void bond_destructor(struct net_device *bond_dev)
3866 {
3867         struct bonding *bond = netdev_priv(bond_dev);
3868         if (bond->wq)
3869                 destroy_workqueue(bond->wq);
3870         free_netdev(bond_dev);
3871 }
3872
3873 void bond_setup(struct net_device *bond_dev)
3874 {
3875         struct bonding *bond = netdev_priv(bond_dev);
3876
3877         /* initialize rwlocks */
3878         rwlock_init(&bond->lock);
3879         rwlock_init(&bond->curr_slave_lock);
3880         bond->params = bonding_defaults;
3881
3882         /* Initialize pointers */
3883         bond->dev = bond_dev;
3884
3885         /* Initialize the device entry points */
3886         ether_setup(bond_dev);
3887         bond_dev->netdev_ops = &bond_netdev_ops;
3888         bond_dev->ethtool_ops = &bond_ethtool_ops;
3889
3890         bond_dev->destructor = bond_destructor;
3891
3892         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
3893
3894         /* Initialize the device options */
3895         bond_dev->tx_queue_len = 0;
3896         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
3897         bond_dev->priv_flags |= IFF_BONDING;
3898         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
3899
3900         /* At first, we block adding VLANs. That's the only way to
3901          * prevent problems that occur when adding VLANs over an
3902          * empty bond. The block will be removed once non-challenged
3903          * slaves are enslaved.
3904          */
3905         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
3906
3907         /* don't acquire bond device's netif_tx_lock when
3908          * transmitting */
3909         bond_dev->features |= NETIF_F_LLTX;
3910
3911         /* By default, we declare the bond to be fully
3912          * VLAN hardware accelerated capable. Special
3913          * care is taken in the various xmit functions
3914          * when there are slaves that are not hw accel
3915          * capable
3916          */
3917
3918         /* Don't allow bond devices to change network namespaces. */
3919         bond_dev->features |= NETIF_F_NETNS_LOCAL;
3920
3921         bond_dev->hw_features = BOND_VLAN_FEATURES |
3922                                 NETIF_F_HW_VLAN_CTAG_TX |
3923                                 NETIF_F_HW_VLAN_CTAG_RX |
3924                                 NETIF_F_HW_VLAN_CTAG_FILTER;
3925
3926         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
3927         bond_dev->features |= bond_dev->hw_features;
3928 }
3929
3930 /*
3931 * Destroy a bonding device.
3932 * Must be under rtnl_lock when this function is called.
3933 */
3934 static void bond_uninit(struct net_device *bond_dev)
3935 {
3936         struct bonding *bond = netdev_priv(bond_dev);
3937         struct list_head *iter;
3938         struct slave *slave;
3939
3940         bond_netpoll_cleanup(bond_dev);
3941
3942         /* Release the bonded slaves */
3943         bond_for_each_slave(bond, slave, iter)
3944                 __bond_release_one(bond_dev, slave->dev, true);
3945         pr_info("%s: released all slaves\n", bond_dev->name);
3946
3947         list_del(&bond->bond_list);
3948
3949         bond_debug_unregister(bond);
3950 }
3951
3952 /*------------------------- Module initialization ---------------------------*/
3953
3954 int bond_parm_tbl_lookup(int mode, const struct bond_parm_tbl *tbl)
3955 {
3956         int i;
3957
3958         for (i = 0; tbl[i].modename; i++)
3959                 if (mode == tbl[i].mode)
3960                         return tbl[i].mode;
3961
3962         return -1;
3963 }
3964
3965 static int bond_parm_tbl_lookup_name(const char *modename,
3966                                      const struct bond_parm_tbl *tbl)
3967 {
3968         int i;
3969
3970         for (i = 0; tbl[i].modename; i++)
3971                 if (strcmp(modename, tbl[i].modename) == 0)
3972                         return tbl[i].mode;
3973
3974         return -1;
3975 }
3976
3977 /*
3978  * Convert string input module parms.  Accept either the
3979  * number of the mode or its string name.  A bit complicated because
3980  * some mode names are substrings of other names, and calls from sysfs
3981  * may have whitespace in the name (trailing newlines, for example).
3982  */
3983 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
3984 {
3985         int modeint;
3986         char *p, modestr[BOND_MAX_MODENAME_LEN + 1];
3987
3988         for (p = (char *)buf; *p; p++)
3989                 if (!(isdigit(*p) || isspace(*p)))
3990                         break;
3991
3992         if (*p && sscanf(buf, "%20s", modestr) != 0)
3993                 return bond_parm_tbl_lookup_name(modestr, tbl);
3994         else if (sscanf(buf, "%d", &modeint) != 0)
3995                 return bond_parm_tbl_lookup(modeint, tbl);
3996
3997         return -1;
3998 }
3999
4000 static int bond_check_params(struct bond_params *params)
4001 {
4002         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4003         struct bond_opt_value newval, *valptr;
4004         int arp_all_targets_value;
4005
4006         /*
4007          * Convert string parameters.
4008          */
4009         if (mode) {
4010                 bond_opt_initstr(&newval, mode);
4011                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4012                 if (!valptr) {
4013                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4014                         return -EINVAL;
4015                 }
4016                 bond_mode = valptr->value;
4017         }
4018
4019         if (xmit_hash_policy) {
4020                 if ((bond_mode != BOND_MODE_XOR) &&
4021                     (bond_mode != BOND_MODE_8023AD)) {
4022                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4023                                bond_mode_name(bond_mode));
4024                 } else {
4025                         bond_opt_initstr(&newval, xmit_hash_policy);
4026                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4027                                                 &newval);
4028                         if (!valptr) {
4029                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4030                                        xmit_hash_policy);
4031                                 return -EINVAL;
4032                         }
4033                         xmit_hashtype = valptr->value;
4034                 }
4035         }
4036
4037         if (lacp_rate) {
4038                 if (bond_mode != BOND_MODE_8023AD) {
4039                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4040                                 bond_mode_name(bond_mode));
4041                 } else {
4042                         bond_opt_initstr(&newval, lacp_rate);
4043                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4044                                                 &newval);
4045                         if (!valptr) {
4046                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4047                                        lacp_rate);
4048                                 return -EINVAL;
4049                         }
4050                         lacp_fast = valptr->value;
4051                 }
4052         }
4053
4054         if (ad_select) {
4055                 bond_opt_initstr(&newval, lacp_rate);
4056                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4057                                         &newval);
4058                 if (!valptr) {
4059                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4060                         return -EINVAL;
4061                 }
4062                 params->ad_select = valptr->value;
4063                 if (bond_mode != BOND_MODE_8023AD)
4064                         pr_warning("ad_select param only affects 802.3ad mode\n");
4065         } else {
4066                 params->ad_select = BOND_AD_STABLE;
4067         }
4068
4069         if (max_bonds < 0) {
4070                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4071                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4072                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4073         }
4074
4075         if (miimon < 0) {
4076                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4077                            miimon, INT_MAX);
4078                 miimon = 0;
4079         }
4080
4081         if (updelay < 0) {
4082                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4083                            updelay, INT_MAX);
4084                 updelay = 0;
4085         }
4086
4087         if (downdelay < 0) {
4088                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4089                            downdelay, INT_MAX);
4090                 downdelay = 0;
4091         }
4092
4093         if ((use_carrier != 0) && (use_carrier != 1)) {
4094                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4095                            use_carrier);
4096                 use_carrier = 1;
4097         }
4098
4099         if (num_peer_notif < 0 || num_peer_notif > 255) {
4100                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4101                            num_peer_notif);
4102                 num_peer_notif = 1;
4103         }
4104
4105         /* reset values for 802.3ad/TLB/ALB */
4106         if (BOND_NO_USES_ARP(bond_mode)) {
4107                 if (!miimon) {
4108                         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");
4109                         pr_warning("Forcing miimon to 100msec\n");
4110                         miimon = BOND_DEFAULT_MIIMON;
4111                 }
4112         }
4113
4114         if (tx_queues < 1 || tx_queues > 255) {
4115                 pr_warning("Warning: tx_queues (%d) should be between "
4116                            "1 and 255, resetting to %d\n",
4117                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4118                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4119         }
4120
4121         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4122                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4123                            "not of valid value (0/1), so it was set to "
4124                            "0\n", all_slaves_active);
4125                 all_slaves_active = 0;
4126         }
4127
4128         if (resend_igmp < 0 || resend_igmp > 255) {
4129                 pr_warning("Warning: resend_igmp (%d) should be between "
4130                            "0 and 255, resetting to %d\n",
4131                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4132                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4133         }
4134
4135         bond_opt_initval(&newval, packets_per_slave);
4136         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4137                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4138                         packets_per_slave, USHRT_MAX);
4139                 packets_per_slave = 1;
4140         }
4141
4142         if (bond_mode == BOND_MODE_ALB) {
4143                 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",
4144                           updelay);
4145         }
4146
4147         if (!miimon) {
4148                 if (updelay || downdelay) {
4149                         /* just warn the user the up/down delay will have
4150                          * no effect since miimon is zero...
4151                          */
4152                         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",
4153                                    updelay, downdelay);
4154                 }
4155         } else {
4156                 /* don't allow arp monitoring */
4157                 if (arp_interval) {
4158                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4159                                    miimon, arp_interval);
4160                         arp_interval = 0;
4161                 }
4162
4163                 if ((updelay % miimon) != 0) {
4164                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4165                                    updelay, miimon,
4166                                    (updelay / miimon) * miimon);
4167                 }
4168
4169                 updelay /= miimon;
4170
4171                 if ((downdelay % miimon) != 0) {
4172                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4173                                    downdelay, miimon,
4174                                    (downdelay / miimon) * miimon);
4175                 }
4176
4177                 downdelay /= miimon;
4178         }
4179
4180         if (arp_interval < 0) {
4181                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to 0\n",
4182                            arp_interval, INT_MAX);
4183                 arp_interval = 0;
4184         }
4185
4186         for (arp_ip_count = 0, i = 0;
4187              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4188                 /* not complete check, but should be good enough to
4189                    catch mistakes */
4190                 __be32 ip;
4191                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4192                     IS_IP_TARGET_UNUSABLE_ADDRESS(ip)) {
4193                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4194                                    arp_ip_target[i]);
4195                         arp_interval = 0;
4196                 } else {
4197                         if (bond_get_targets_ip(arp_target, ip) == -1)
4198                                 arp_target[arp_ip_count++] = ip;
4199                         else
4200                                 pr_warning("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4201                                            &ip);
4202                 }
4203         }
4204
4205         if (arp_interval && !arp_ip_count) {
4206                 /* don't allow arping if no arp_ip_target given... */
4207                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4208                            arp_interval);
4209                 arp_interval = 0;
4210         }
4211
4212         if (arp_validate) {
4213                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4214                         pr_err("arp_validate only supported in active-backup mode\n");
4215                         return -EINVAL;
4216                 }
4217                 if (!arp_interval) {
4218                         pr_err("arp_validate requires arp_interval\n");
4219                         return -EINVAL;
4220                 }
4221
4222                 bond_opt_initstr(&newval, arp_validate);
4223                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4224                                         &newval);
4225                 if (!valptr) {
4226                         pr_err("Error: invalid arp_validate \"%s\"\n",
4227                                arp_validate);
4228                         return -EINVAL;
4229                 }
4230                 arp_validate_value = valptr->value;
4231         } else {
4232                 arp_validate_value = 0;
4233         }
4234
4235         arp_all_targets_value = 0;
4236         if (arp_all_targets) {
4237                 bond_opt_initstr(&newval, arp_all_targets);
4238                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4239                                         &newval);
4240                 if (!valptr) {
4241                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4242                                arp_all_targets);
4243                         arp_all_targets_value = 0;
4244                 } else {
4245                         arp_all_targets_value = valptr->value;
4246                 }
4247         }
4248
4249         if (miimon) {
4250                 pr_info("MII link monitoring set to %d ms\n", miimon);
4251         } else if (arp_interval) {
4252                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4253                                           arp_validate_value);
4254                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4255                         arp_interval, valptr->string, arp_ip_count);
4256
4257                 for (i = 0; i < arp_ip_count; i++)
4258                         pr_info(" %s", arp_ip_target[i]);
4259
4260                 pr_info("\n");
4261
4262         } else if (max_bonds) {
4263                 /* miimon and arp_interval not set, we need one so things
4264                  * work as expected, see bonding.txt for details
4265                  */
4266                 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");
4267         }
4268
4269         if (primary && !USES_PRIMARY(bond_mode)) {
4270                 /* currently, using a primary only makes sense
4271                  * in active backup, TLB or ALB modes
4272                  */
4273                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4274                            primary, bond_mode_name(bond_mode));
4275                 primary = NULL;
4276         }
4277
4278         if (primary && primary_reselect) {
4279                 bond_opt_initstr(&newval, primary_reselect);
4280                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4281                                         &newval);
4282                 if (!valptr) {
4283                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4284                                primary_reselect);
4285                         return -EINVAL;
4286                 }
4287                 primary_reselect_value = valptr->value;
4288         } else {
4289                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4290         }
4291
4292         if (fail_over_mac) {
4293                 bond_opt_initstr(&newval, fail_over_mac);
4294                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4295                                         &newval);
4296                 if (!valptr) {
4297                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4298                                fail_over_mac);
4299                         return -EINVAL;
4300                 }
4301                 fail_over_mac_value = valptr->value;
4302                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4303                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4304         } else {
4305                 fail_over_mac_value = BOND_FOM_NONE;
4306         }
4307
4308         if (lp_interval == 0) {
4309                 pr_warning("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4310                            INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4311                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4312         }
4313
4314         /* fill params struct with the proper values */
4315         params->mode = bond_mode;
4316         params->xmit_policy = xmit_hashtype;
4317         params->miimon = miimon;
4318         params->num_peer_notif = num_peer_notif;
4319         params->arp_interval = arp_interval;
4320         params->arp_validate = arp_validate_value;
4321         params->arp_all_targets = arp_all_targets_value;
4322         params->updelay = updelay;
4323         params->downdelay = downdelay;
4324         params->use_carrier = use_carrier;
4325         params->lacp_fast = lacp_fast;
4326         params->primary[0] = 0;
4327         params->primary_reselect = primary_reselect_value;
4328         params->fail_over_mac = fail_over_mac_value;
4329         params->tx_queues = tx_queues;
4330         params->all_slaves_active = all_slaves_active;
4331         params->resend_igmp = resend_igmp;
4332         params->min_links = min_links;
4333         params->lp_interval = lp_interval;
4334         params->packets_per_slave = packets_per_slave;
4335         if (packets_per_slave > 0) {
4336                 params->reciprocal_packets_per_slave =
4337                         reciprocal_value(packets_per_slave);
4338         } else {
4339                 /* reciprocal_packets_per_slave is unused if
4340                  * packets_per_slave is 0 or 1, just initialize it
4341                  */
4342                 params->reciprocal_packets_per_slave =
4343                         (struct reciprocal_value) { 0 };
4344         }
4345
4346         if (primary) {
4347                 strncpy(params->primary, primary, IFNAMSIZ);
4348                 params->primary[IFNAMSIZ - 1] = 0;
4349         }
4350
4351         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4352
4353         return 0;
4354 }
4355
4356 static struct lock_class_key bonding_netdev_xmit_lock_key;
4357 static struct lock_class_key bonding_netdev_addr_lock_key;
4358 static struct lock_class_key bonding_tx_busylock_key;
4359
4360 static void bond_set_lockdep_class_one(struct net_device *dev,
4361                                        struct netdev_queue *txq,
4362                                        void *_unused)
4363 {
4364         lockdep_set_class(&txq->_xmit_lock,
4365                           &bonding_netdev_xmit_lock_key);
4366 }
4367
4368 static void bond_set_lockdep_class(struct net_device *dev)
4369 {
4370         lockdep_set_class(&dev->addr_list_lock,
4371                           &bonding_netdev_addr_lock_key);
4372         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4373         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4374 }
4375
4376 /*
4377  * Called from registration process
4378  */
4379 static int bond_init(struct net_device *bond_dev)
4380 {
4381         struct bonding *bond = netdev_priv(bond_dev);
4382         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4383         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4384
4385         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4386
4387         /*
4388          * Initialize locks that may be required during
4389          * en/deslave operations.  All of the bond_open work
4390          * (of which this is part) should really be moved to
4391          * a phase prior to dev_open
4392          */
4393         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4394         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4395
4396         bond->wq = create_singlethread_workqueue(bond_dev->name);
4397         if (!bond->wq)
4398                 return -ENOMEM;
4399
4400         bond_set_lockdep_class(bond_dev);
4401
4402         list_add_tail(&bond->bond_list, &bn->dev_list);
4403
4404         bond_prepare_sysfs_group(bond);
4405
4406         bond_debug_register(bond);
4407
4408         /* Ensure valid dev_addr */
4409         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4410             bond_dev->addr_assign_type == NET_ADDR_PERM)
4411                 eth_hw_addr_random(bond_dev);
4412
4413         return 0;
4414 }
4415
4416 unsigned int bond_get_num_tx_queues(void)
4417 {
4418         return tx_queues;
4419 }
4420
4421 /* Create a new bond based on the specified name and bonding parameters.
4422  * If name is NULL, obtain a suitable "bond%d" name for us.
4423  * Caller must NOT hold rtnl_lock; we need to release it here before we
4424  * set up our sysfs entries.
4425  */
4426 int bond_create(struct net *net, const char *name)
4427 {
4428         struct net_device *bond_dev;
4429         int res;
4430
4431         rtnl_lock();
4432
4433         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4434                                    name ? name : "bond%d",
4435                                    bond_setup, tx_queues);
4436         if (!bond_dev) {
4437                 pr_err("%s: eek! can't alloc netdev!\n", name);
4438                 rtnl_unlock();
4439                 return -ENOMEM;
4440         }
4441
4442         dev_net_set(bond_dev, net);
4443         bond_dev->rtnl_link_ops = &bond_link_ops;
4444
4445         res = register_netdevice(bond_dev);
4446
4447         netif_carrier_off(bond_dev);
4448
4449         rtnl_unlock();
4450         if (res < 0)
4451                 bond_destructor(bond_dev);
4452         return res;
4453 }
4454
4455 static int __net_init bond_net_init(struct net *net)
4456 {
4457         struct bond_net *bn = net_generic(net, bond_net_id);
4458
4459         bn->net = net;
4460         INIT_LIST_HEAD(&bn->dev_list);
4461
4462         bond_create_proc_dir(bn);
4463         bond_create_sysfs(bn);
4464
4465         return 0;
4466 }
4467
4468 static void __net_exit bond_net_exit(struct net *net)
4469 {
4470         struct bond_net *bn = net_generic(net, bond_net_id);
4471         struct bonding *bond, *tmp_bond;
4472         LIST_HEAD(list);
4473
4474         bond_destroy_sysfs(bn);
4475         bond_destroy_proc_dir(bn);
4476
4477         /* Kill off any bonds created after unregistering bond rtnl ops */
4478         rtnl_lock();
4479         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4480                 unregister_netdevice_queue(bond->dev, &list);
4481         unregister_netdevice_many(&list);
4482         rtnl_unlock();
4483 }
4484
4485 static struct pernet_operations bond_net_ops = {
4486         .init = bond_net_init,
4487         .exit = bond_net_exit,
4488         .id   = &bond_net_id,
4489         .size = sizeof(struct bond_net),
4490 };
4491
4492 static int __init bonding_init(void)
4493 {
4494         int i;
4495         int res;
4496
4497         pr_info("%s", bond_version);
4498
4499         res = bond_check_params(&bonding_defaults);
4500         if (res)
4501                 goto out;
4502
4503         res = register_pernet_subsys(&bond_net_ops);
4504         if (res)
4505                 goto out;
4506
4507         res = bond_netlink_init();
4508         if (res)
4509                 goto err_link;
4510
4511         bond_create_debugfs();
4512
4513         for (i = 0; i < max_bonds; i++) {
4514                 res = bond_create(&init_net, NULL);
4515                 if (res)
4516                         goto err;
4517         }
4518
4519         register_netdevice_notifier(&bond_netdev_notifier);
4520 out:
4521         return res;
4522 err:
4523         bond_netlink_fini();
4524 err_link:
4525         unregister_pernet_subsys(&bond_net_ops);
4526         goto out;
4527
4528 }
4529
4530 static void __exit bonding_exit(void)
4531 {
4532         unregister_netdevice_notifier(&bond_netdev_notifier);
4533
4534         bond_destroy_debugfs();
4535
4536         bond_netlink_fini();
4537         unregister_pernet_subsys(&bond_net_ops);
4538
4539 #ifdef CONFIG_NET_POLL_CONTROLLER
4540         /*
4541          * Make sure we don't have an imbalance on our netpoll blocking
4542          */
4543         WARN_ON(atomic_read(&netpoll_block_tx));
4544 #endif
4545 }
4546
4547 module_init(bonding_init);
4548 module_exit(bonding_exit);
4549 MODULE_LICENSE("GPL");
4550 MODULE_VERSION(DRV_VERSION);
4551 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4552 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");