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_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1274                                    bond_dev->name);
1275                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1276                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1277                         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",
1278                                bond_dev->name);
1279                         res = -EOPNOTSUPP;
1280                         goto err_undo_flags;
1281                 }
1282         }
1283
1284         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1285
1286         /* If this is the first slave, then we need to set the master's hardware
1287          * address to be the same as the slave's. */
1288         if (!bond_has_slaves(bond) &&
1289             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1290                 bond_set_dev_addr(bond->dev, slave_dev);
1291
1292         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1293         if (!new_slave) {
1294                 res = -ENOMEM;
1295                 goto err_undo_flags;
1296         }
1297         /*
1298          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1299          * is set via sysfs or module option if desired.
1300          */
1301         new_slave->queue_id = 0;
1302
1303         /* Save slave's original mtu and then set it to match the bond */
1304         new_slave->original_mtu = slave_dev->mtu;
1305         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1306         if (res) {
1307                 pr_debug("Error %d calling dev_set_mtu\n", res);
1308                 goto err_free;
1309         }
1310
1311         /*
1312          * Save slave's original ("permanent") mac address for modes
1313          * that need it, and for restoring it upon release, and then
1314          * set it to the master's address
1315          */
1316         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1317
1318         if (!bond->params.fail_over_mac) {
1319                 /*
1320                  * Set slave to master's mac address.  The application already
1321                  * set the master's mac address to that of the first slave
1322                  */
1323                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1324                 addr.sa_family = slave_dev->type;
1325                 res = dev_set_mac_address(slave_dev, &addr);
1326                 if (res) {
1327                         pr_debug("Error %d calling set_mac_address\n", res);
1328                         goto err_restore_mtu;
1329                 }
1330         }
1331
1332         /* open the slave since the application closed it */
1333         res = dev_open(slave_dev);
1334         if (res) {
1335                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1336                 goto err_restore_mac;
1337         }
1338
1339         new_slave->bond = bond;
1340         new_slave->dev = slave_dev;
1341         slave_dev->priv_flags |= IFF_BONDING;
1342
1343         if (bond_is_lb(bond)) {
1344                 /* bond_alb_init_slave() must be called before all other stages since
1345                  * it might fail and we do not want to have to undo everything
1346                  */
1347                 res = bond_alb_init_slave(bond, new_slave);
1348                 if (res)
1349                         goto err_close;
1350         }
1351
1352         /* If the mode USES_PRIMARY, then the following is handled by
1353          * bond_change_active_slave().
1354          */
1355         if (!USES_PRIMARY(bond->params.mode)) {
1356                 /* set promiscuity level to new slave */
1357                 if (bond_dev->flags & IFF_PROMISC) {
1358                         res = dev_set_promiscuity(slave_dev, 1);
1359                         if (res)
1360                                 goto err_close;
1361                 }
1362
1363                 /* set allmulti level to new slave */
1364                 if (bond_dev->flags & IFF_ALLMULTI) {
1365                         res = dev_set_allmulti(slave_dev, 1);
1366                         if (res)
1367                                 goto err_close;
1368                 }
1369
1370                 netif_addr_lock_bh(bond_dev);
1371
1372                 dev_mc_sync_multiple(slave_dev, bond_dev);
1373                 dev_uc_sync_multiple(slave_dev, bond_dev);
1374
1375                 netif_addr_unlock_bh(bond_dev);
1376         }
1377
1378         if (bond->params.mode == BOND_MODE_8023AD) {
1379                 /* add lacpdu mc addr to mc list */
1380                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1381
1382                 dev_mc_add(slave_dev, lacpdu_multicast);
1383         }
1384
1385         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1386         if (res) {
1387                 pr_err("%s: Error: Couldn't add bond vlan ids to %s\n",
1388                        bond_dev->name, slave_dev->name);
1389                 goto err_close;
1390         }
1391
1392         prev_slave = bond_last_slave(bond);
1393
1394         new_slave->delay = 0;
1395         new_slave->link_failure_count = 0;
1396
1397         bond_update_speed_duplex(new_slave);
1398
1399         new_slave->last_arp_rx = jiffies -
1400                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1401         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1402                 new_slave->target_last_arp_rx[i] = new_slave->last_arp_rx;
1403
1404         if (bond->params.miimon && !bond->params.use_carrier) {
1405                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1406
1407                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1408                         /*
1409                          * miimon is set but a bonded network driver
1410                          * does not support ETHTOOL/MII and
1411                          * arp_interval is not set.  Note: if
1412                          * use_carrier is enabled, we will never go
1413                          * here (because netif_carrier is always
1414                          * supported); thus, we don't need to change
1415                          * the messages for netif_carrier.
1416                          */
1417                         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",
1418                                bond_dev->name, slave_dev->name);
1419                 } else if (link_reporting == -1) {
1420                         /* unable get link status using mii/ethtool */
1421                         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",
1422                                    bond_dev->name, slave_dev->name);
1423                 }
1424         }
1425
1426         /* check for initial state */
1427         if (bond->params.miimon) {
1428                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1429                         if (bond->params.updelay) {
1430                                 new_slave->link = BOND_LINK_BACK;
1431                                 new_slave->delay = bond->params.updelay;
1432                         } else {
1433                                 new_slave->link = BOND_LINK_UP;
1434                         }
1435                 } else {
1436                         new_slave->link = BOND_LINK_DOWN;
1437                 }
1438         } else if (bond->params.arp_interval) {
1439                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1440                         BOND_LINK_UP : BOND_LINK_DOWN);
1441         } else {
1442                 new_slave->link = BOND_LINK_UP;
1443         }
1444
1445         if (new_slave->link != BOND_LINK_DOWN)
1446                 new_slave->jiffies = jiffies;
1447         pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1448                 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1449                         (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1450
1451         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1452                 /* if there is a primary slave, remember it */
1453                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1454                         bond->primary_slave = new_slave;
1455                         bond->force_primary = true;
1456                 }
1457         }
1458
1459         switch (bond->params.mode) {
1460         case BOND_MODE_ACTIVEBACKUP:
1461                 bond_set_slave_inactive_flags(new_slave);
1462                 break;
1463         case BOND_MODE_8023AD:
1464                 /* in 802.3ad mode, the internal mechanism
1465                  * will activate the slaves in the selected
1466                  * aggregator
1467                  */
1468                 bond_set_slave_inactive_flags(new_slave);
1469                 /* if this is the first slave */
1470                 if (!prev_slave) {
1471                         SLAVE_AD_INFO(new_slave).id = 1;
1472                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1473                          * can be called only after the mac address of the bond is set
1474                          */
1475                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1476                 } else {
1477                         SLAVE_AD_INFO(new_slave).id =
1478                                 SLAVE_AD_INFO(prev_slave).id + 1;
1479                 }
1480
1481                 bond_3ad_bind_slave(new_slave);
1482                 break;
1483         case BOND_MODE_TLB:
1484         case BOND_MODE_ALB:
1485                 bond_set_active_slave(new_slave);
1486                 bond_set_slave_inactive_flags(new_slave);
1487                 break;
1488         default:
1489                 pr_debug("This slave is always active in trunk mode\n");
1490
1491                 /* always active in trunk mode */
1492                 bond_set_active_slave(new_slave);
1493
1494                 /* In trunking mode there is little meaning to curr_active_slave
1495                  * anyway (it holds no special properties of the bond device),
1496                  * so we can change it without calling change_active_interface()
1497                  */
1498                 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1499                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1500
1501                 break;
1502         } /* switch(bond_mode) */
1503
1504 #ifdef CONFIG_NET_POLL_CONTROLLER
1505         slave_dev->npinfo = bond->dev->npinfo;
1506         if (slave_dev->npinfo) {
1507                 if (slave_enable_netpoll(new_slave)) {
1508                         read_unlock(&bond->lock);
1509                         pr_info("Error, %s: master_dev is using netpoll, "
1510                                  "but new slave device does not support netpoll.\n",
1511                                  bond_dev->name);
1512                         res = -EBUSY;
1513                         goto err_detach;
1514                 }
1515         }
1516 #endif
1517
1518         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1519                                          new_slave);
1520         if (res) {
1521                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1522                 goto err_detach;
1523         }
1524
1525         res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1526         if (res) {
1527                 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1528                 goto err_unregister;
1529         }
1530
1531         res = bond_sysfs_slave_add(new_slave);
1532         if (res) {
1533                 pr_debug("Error %d calling bond_sysfs_slave_add\n", res);
1534                 goto err_upper_unlink;
1535         }
1536
1537         bond->slave_cnt++;
1538         bond_compute_features(bond);
1539         bond_set_carrier(bond);
1540
1541         if (USES_PRIMARY(bond->params.mode)) {
1542                 write_lock_bh(&bond->curr_slave_lock);
1543                 bond_select_active_slave(bond);
1544                 write_unlock_bh(&bond->curr_slave_lock);
1545         }
1546
1547         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1548                 bond_dev->name, slave_dev->name,
1549                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1550                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1551
1552         /* enslave is successful */
1553         return 0;
1554
1555 /* Undo stages on error */
1556 err_upper_unlink:
1557         bond_upper_dev_unlink(bond_dev, slave_dev);
1558
1559 err_unregister:
1560         netdev_rx_handler_unregister(slave_dev);
1561
1562 err_detach:
1563         if (!USES_PRIMARY(bond->params.mode))
1564                 bond_hw_addr_flush(bond_dev, slave_dev);
1565
1566         vlan_vids_del_by_dev(slave_dev, bond_dev);
1567         if (bond->primary_slave == new_slave)
1568                 bond->primary_slave = NULL;
1569         if (bond->curr_active_slave == new_slave) {
1570                 write_lock_bh(&bond->curr_slave_lock);
1571                 bond_change_active_slave(bond, NULL);
1572                 bond_select_active_slave(bond);
1573                 write_unlock_bh(&bond->curr_slave_lock);
1574         }
1575         slave_disable_netpoll(new_slave);
1576
1577 err_close:
1578         slave_dev->priv_flags &= ~IFF_BONDING;
1579         dev_close(slave_dev);
1580
1581 err_restore_mac:
1582         if (!bond->params.fail_over_mac) {
1583                 /* XXX TODO - fom follow mode needs to change master's
1584                  * MAC if this slave's MAC is in use by the bond, or at
1585                  * least print a warning.
1586                  */
1587                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1588                 addr.sa_family = slave_dev->type;
1589                 dev_set_mac_address(slave_dev, &addr);
1590         }
1591
1592 err_restore_mtu:
1593         dev_set_mtu(slave_dev, new_slave->original_mtu);
1594
1595 err_free:
1596         kfree(new_slave);
1597
1598 err_undo_flags:
1599         /* Enslave of first slave has failed and we need to fix master's mac */
1600         if (!bond_has_slaves(bond) &&
1601             ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
1602                 eth_hw_addr_random(bond_dev);
1603
1604         return res;
1605 }
1606
1607 /*
1608  * Try to release the slave device <slave> from the bond device <master>
1609  * It is legal to access curr_active_slave without a lock because all the function
1610  * is write-locked. If "all" is true it means that the function is being called
1611  * while destroying a bond interface and all slaves are being released.
1612  *
1613  * The rules for slave state should be:
1614  *   for Active/Backup:
1615  *     Active stays on all backups go down
1616  *   for Bonded connections:
1617  *     The first up interface should be left on and all others downed.
1618  */
1619 static int __bond_release_one(struct net_device *bond_dev,
1620                               struct net_device *slave_dev,
1621                               bool all)
1622 {
1623         struct bonding *bond = netdev_priv(bond_dev);
1624         struct slave *slave, *oldcurrent;
1625         struct sockaddr addr;
1626         int old_flags = bond_dev->flags;
1627         netdev_features_t old_features = bond_dev->features;
1628
1629         /* slave is not a slave or master is not master of this slave */
1630         if (!(slave_dev->flags & IFF_SLAVE) ||
1631             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1632                 pr_err("%s: Error: cannot release %s.\n",
1633                        bond_dev->name, slave_dev->name);
1634                 return -EINVAL;
1635         }
1636
1637         block_netpoll_tx();
1638
1639         slave = bond_get_slave_by_dev(bond, slave_dev);
1640         if (!slave) {
1641                 /* not a slave of this bond */
1642                 pr_info("%s: %s not enslaved\n",
1643                         bond_dev->name, slave_dev->name);
1644                 unblock_netpoll_tx();
1645                 return -EINVAL;
1646         }
1647
1648         /* release the slave from its bond */
1649         bond->slave_cnt--;
1650
1651         bond_sysfs_slave_del(slave);
1652
1653         bond_upper_dev_unlink(bond_dev, slave_dev);
1654         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1655          * for this slave anymore.
1656          */
1657         netdev_rx_handler_unregister(slave_dev);
1658         write_lock_bh(&bond->lock);
1659
1660         /* Inform AD package of unbinding of slave. */
1661         if (bond->params.mode == BOND_MODE_8023AD)
1662                 bond_3ad_unbind_slave(slave);
1663
1664         write_unlock_bh(&bond->lock);
1665
1666         pr_info("%s: releasing %s interface %s\n",
1667                 bond_dev->name,
1668                 bond_is_active_slave(slave) ? "active" : "backup",
1669                 slave_dev->name);
1670
1671         oldcurrent = bond->curr_active_slave;
1672
1673         bond->current_arp_slave = NULL;
1674
1675         if (!all && !bond->params.fail_over_mac) {
1676                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1677                     bond_has_slaves(bond))
1678                         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",
1679                                    bond_dev->name, slave_dev->name,
1680                                    slave->perm_hwaddr,
1681                                    bond_dev->name, slave_dev->name);
1682         }
1683
1684         if (bond->primary_slave == slave)
1685                 bond->primary_slave = NULL;
1686
1687         if (oldcurrent == slave) {
1688                 write_lock_bh(&bond->curr_slave_lock);
1689                 bond_change_active_slave(bond, NULL);
1690                 write_unlock_bh(&bond->curr_slave_lock);
1691         }
1692
1693         if (bond_is_lb(bond)) {
1694                 /* Must be called only after the slave has been
1695                  * detached from the list and the curr_active_slave
1696                  * has been cleared (if our_slave == old_current),
1697                  * but before a new active slave is selected.
1698                  */
1699                 bond_alb_deinit_slave(bond, slave);
1700         }
1701
1702         if (all) {
1703                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1704         } else if (oldcurrent == slave) {
1705                 /*
1706                  * Note that we hold RTNL over this sequence, so there
1707                  * is no concern that another slave add/remove event
1708                  * will interfere.
1709                  */
1710                 write_lock_bh(&bond->curr_slave_lock);
1711
1712                 bond_select_active_slave(bond);
1713
1714                 write_unlock_bh(&bond->curr_slave_lock);
1715         }
1716
1717         if (!bond_has_slaves(bond)) {
1718                 bond_set_carrier(bond);
1719                 eth_hw_addr_random(bond_dev);
1720
1721                 if (vlan_uses_dev(bond_dev)) {
1722                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1723                                    bond_dev->name, bond_dev->name);
1724                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1725                                    bond_dev->name);
1726                 }
1727         }
1728
1729         unblock_netpoll_tx();
1730         synchronize_rcu();
1731
1732         if (!bond_has_slaves(bond)) {
1733                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1734                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1735         }
1736
1737         bond_compute_features(bond);
1738         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1739             (old_features & NETIF_F_VLAN_CHALLENGED))
1740                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1741                         bond_dev->name, slave_dev->name, bond_dev->name);
1742
1743         /* must do this from outside any spinlocks */
1744         vlan_vids_del_by_dev(slave_dev, bond_dev);
1745
1746         /* If the mode USES_PRIMARY, then this cases was handled above by
1747          * bond_change_active_slave(..., NULL)
1748          */
1749         if (!USES_PRIMARY(bond->params.mode)) {
1750                 /* unset promiscuity level from slave
1751                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1752                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1753                  * value of that flag before that change, as that was the value
1754                  * when this slave was attached, so we cache at the start of the
1755                  * function and use it here. Same goes for ALLMULTI below
1756                  */
1757                 if (old_flags & IFF_PROMISC)
1758                         dev_set_promiscuity(slave_dev, -1);
1759
1760                 /* unset allmulti level from slave */
1761                 if (old_flags & IFF_ALLMULTI)
1762                         dev_set_allmulti(slave_dev, -1);
1763
1764                 bond_hw_addr_flush(bond_dev, slave_dev);
1765         }
1766
1767         slave_disable_netpoll(slave);
1768
1769         /* close slave before restoring its mac address */
1770         dev_close(slave_dev);
1771
1772         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1773                 /* restore original ("permanent") mac address */
1774                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1775                 addr.sa_family = slave_dev->type;
1776                 dev_set_mac_address(slave_dev, &addr);
1777         }
1778
1779         dev_set_mtu(slave_dev, slave->original_mtu);
1780
1781         slave_dev->priv_flags &= ~IFF_BONDING;
1782
1783         kfree(slave);
1784
1785         return 0;  /* deletion OK */
1786 }
1787
1788 /* A wrapper used because of ndo_del_link */
1789 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1790 {
1791         return __bond_release_one(bond_dev, slave_dev, false);
1792 }
1793
1794 /*
1795 * First release a slave and then destroy the bond if no more slaves are left.
1796 * Must be under rtnl_lock when this function is called.
1797 */
1798 static int  bond_release_and_destroy(struct net_device *bond_dev,
1799                                      struct net_device *slave_dev)
1800 {
1801         struct bonding *bond = netdev_priv(bond_dev);
1802         int ret;
1803
1804         ret = bond_release(bond_dev, slave_dev);
1805         if (ret == 0 && !bond_has_slaves(bond)) {
1806                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1807                 pr_info("%s: destroying bond %s.\n",
1808                         bond_dev->name, bond_dev->name);
1809                 unregister_netdevice(bond_dev);
1810         }
1811         return ret;
1812 }
1813
1814 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1815 {
1816         struct bonding *bond = netdev_priv(bond_dev);
1817
1818         info->bond_mode = bond->params.mode;
1819         info->miimon = bond->params.miimon;
1820
1821         read_lock(&bond->lock);
1822         info->num_slaves = bond->slave_cnt;
1823         read_unlock(&bond->lock);
1824
1825         return 0;
1826 }
1827
1828 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1829 {
1830         struct bonding *bond = netdev_priv(bond_dev);
1831         struct list_head *iter;
1832         int i = 0, res = -ENODEV;
1833         struct slave *slave;
1834
1835         read_lock(&bond->lock);
1836         bond_for_each_slave(bond, slave, iter) {
1837                 if (i++ == (int)info->slave_id) {
1838                         res = 0;
1839                         strcpy(info->slave_name, slave->dev->name);
1840                         info->link = slave->link;
1841                         info->state = bond_slave_state(slave);
1842                         info->link_failure_count = slave->link_failure_count;
1843                         break;
1844                 }
1845         }
1846         read_unlock(&bond->lock);
1847
1848         return res;
1849 }
1850
1851 /*-------------------------------- Monitoring -------------------------------*/
1852
1853
1854 static int bond_miimon_inspect(struct bonding *bond)
1855 {
1856         int link_state, commit = 0;
1857         struct list_head *iter;
1858         struct slave *slave;
1859         bool ignore_updelay;
1860
1861         ignore_updelay = !bond->curr_active_slave ? true : false;
1862
1863         bond_for_each_slave_rcu(bond, slave, iter) {
1864                 slave->new_link = BOND_LINK_NOCHANGE;
1865
1866                 link_state = bond_check_dev_link(bond, slave->dev, 0);
1867
1868                 switch (slave->link) {
1869                 case BOND_LINK_UP:
1870                         if (link_state)
1871                                 continue;
1872
1873                         slave->link = BOND_LINK_FAIL;
1874                         slave->delay = bond->params.downdelay;
1875                         if (slave->delay) {
1876                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
1877                                         bond->dev->name,
1878                                         (bond->params.mode ==
1879                                          BOND_MODE_ACTIVEBACKUP) ?
1880                                         (bond_is_active_slave(slave) ?
1881                                          "active " : "backup ") : "",
1882                                         slave->dev->name,
1883                                         bond->params.downdelay * bond->params.miimon);
1884                         }
1885                         /*FALLTHRU*/
1886                 case BOND_LINK_FAIL:
1887                         if (link_state) {
1888                                 /*
1889                                  * recovered before downdelay expired
1890                                  */
1891                                 slave->link = BOND_LINK_UP;
1892                                 slave->jiffies = jiffies;
1893                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
1894                                         bond->dev->name,
1895                                         (bond->params.downdelay - slave->delay) *
1896                                         bond->params.miimon,
1897                                         slave->dev->name);
1898                                 continue;
1899                         }
1900
1901                         if (slave->delay <= 0) {
1902                                 slave->new_link = BOND_LINK_DOWN;
1903                                 commit++;
1904                                 continue;
1905                         }
1906
1907                         slave->delay--;
1908                         break;
1909
1910                 case BOND_LINK_DOWN:
1911                         if (!link_state)
1912                                 continue;
1913
1914                         slave->link = BOND_LINK_BACK;
1915                         slave->delay = bond->params.updelay;
1916
1917                         if (slave->delay) {
1918                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
1919                                         bond->dev->name, slave->dev->name,
1920                                         ignore_updelay ? 0 :
1921                                         bond->params.updelay *
1922                                         bond->params.miimon);
1923                         }
1924                         /*FALLTHRU*/
1925                 case BOND_LINK_BACK:
1926                         if (!link_state) {
1927                                 slave->link = BOND_LINK_DOWN;
1928                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
1929                                         bond->dev->name,
1930                                         (bond->params.updelay - slave->delay) *
1931                                         bond->params.miimon,
1932                                         slave->dev->name);
1933
1934                                 continue;
1935                         }
1936
1937                         if (ignore_updelay)
1938                                 slave->delay = 0;
1939
1940                         if (slave->delay <= 0) {
1941                                 slave->new_link = BOND_LINK_UP;
1942                                 commit++;
1943                                 ignore_updelay = false;
1944                                 continue;
1945                         }
1946
1947                         slave->delay--;
1948                         break;
1949                 }
1950         }
1951
1952         return commit;
1953 }
1954
1955 static void bond_miimon_commit(struct bonding *bond)
1956 {
1957         struct list_head *iter;
1958         struct slave *slave;
1959
1960         bond_for_each_slave(bond, slave, iter) {
1961                 switch (slave->new_link) {
1962                 case BOND_LINK_NOCHANGE:
1963                         continue;
1964
1965                 case BOND_LINK_UP:
1966                         slave->link = BOND_LINK_UP;
1967                         slave->jiffies = jiffies;
1968
1969                         if (bond->params.mode == BOND_MODE_8023AD) {
1970                                 /* prevent it from being the active one */
1971                                 bond_set_backup_slave(slave);
1972                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
1973                                 /* make it immediately active */
1974                                 bond_set_active_slave(slave);
1975                         } else if (slave != bond->primary_slave) {
1976                                 /* prevent it from being the active one */
1977                                 bond_set_backup_slave(slave);
1978                         }
1979
1980                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
1981                                 bond->dev->name, slave->dev->name,
1982                                 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
1983                                 slave->duplex ? "full" : "half");
1984
1985                         /* notify ad that the link status has changed */
1986                         if (bond->params.mode == BOND_MODE_8023AD)
1987                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
1988
1989                         if (bond_is_lb(bond))
1990                                 bond_alb_handle_link_change(bond, slave,
1991                                                             BOND_LINK_UP);
1992
1993                         if (!bond->curr_active_slave ||
1994                             (slave == bond->primary_slave))
1995                                 goto do_failover;
1996
1997                         continue;
1998
1999                 case BOND_LINK_DOWN:
2000                         if (slave->link_failure_count < UINT_MAX)
2001                                 slave->link_failure_count++;
2002
2003                         slave->link = BOND_LINK_DOWN;
2004
2005                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2006                             bond->params.mode == BOND_MODE_8023AD)
2007                                 bond_set_slave_inactive_flags(slave);
2008
2009                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2010                                 bond->dev->name, slave->dev->name);
2011
2012                         if (bond->params.mode == BOND_MODE_8023AD)
2013                                 bond_3ad_handle_link_change(slave,
2014                                                             BOND_LINK_DOWN);
2015
2016                         if (bond_is_lb(bond))
2017                                 bond_alb_handle_link_change(bond, slave,
2018                                                             BOND_LINK_DOWN);
2019
2020                         if (slave == bond->curr_active_slave)
2021                                 goto do_failover;
2022
2023                         continue;
2024
2025                 default:
2026                         pr_err("%s: invalid new link %d on slave %s\n",
2027                                bond->dev->name, slave->new_link,
2028                                slave->dev->name);
2029                         slave->new_link = BOND_LINK_NOCHANGE;
2030
2031                         continue;
2032                 }
2033
2034 do_failover:
2035                 ASSERT_RTNL();
2036                 block_netpoll_tx();
2037                 write_lock_bh(&bond->curr_slave_lock);
2038                 bond_select_active_slave(bond);
2039                 write_unlock_bh(&bond->curr_slave_lock);
2040                 unblock_netpoll_tx();
2041         }
2042
2043         bond_set_carrier(bond);
2044 }
2045
2046 /*
2047  * bond_mii_monitor
2048  *
2049  * Really a wrapper that splits the mii monitor into two phases: an
2050  * inspection, then (if inspection indicates something needs to be done)
2051  * an acquisition of appropriate locks followed by a commit phase to
2052  * implement whatever link state changes are indicated.
2053  */
2054 static void bond_mii_monitor(struct work_struct *work)
2055 {
2056         struct bonding *bond = container_of(work, struct bonding,
2057                                             mii_work.work);
2058         bool should_notify_peers = false;
2059         unsigned long delay;
2060
2061         delay = msecs_to_jiffies(bond->params.miimon);
2062
2063         if (!bond_has_slaves(bond))
2064                 goto re_arm;
2065
2066         rcu_read_lock();
2067
2068         should_notify_peers = bond_should_notify_peers(bond);
2069
2070         if (bond_miimon_inspect(bond)) {
2071                 rcu_read_unlock();
2072
2073                 /* Race avoidance with bond_close cancel of workqueue */
2074                 if (!rtnl_trylock()) {
2075                         delay = 1;
2076                         should_notify_peers = false;
2077                         goto re_arm;
2078                 }
2079
2080                 bond_miimon_commit(bond);
2081
2082                 rtnl_unlock();  /* might sleep, hold no other locks */
2083         } else
2084                 rcu_read_unlock();
2085
2086 re_arm:
2087         if (bond->params.miimon)
2088                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2089
2090         if (should_notify_peers) {
2091                 if (!rtnl_trylock())
2092                         return;
2093                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2094                 rtnl_unlock();
2095         }
2096 }
2097
2098 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2099 {
2100         struct net_device *upper;
2101         struct list_head *iter;
2102         bool ret = false;
2103
2104         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2105                 return true;
2106
2107         rcu_read_lock();
2108         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2109                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2110                         ret = true;
2111                         break;
2112                 }
2113         }
2114         rcu_read_unlock();
2115
2116         return ret;
2117 }
2118
2119 /*
2120  * We go to the (large) trouble of VLAN tagging ARP frames because
2121  * switches in VLAN mode (especially if ports are configured as
2122  * "native" to a VLAN) might not pass non-tagged frames.
2123  */
2124 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2125 {
2126         struct sk_buff *skb;
2127
2128         pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op,
2129                  slave_dev->name, &dest_ip, &src_ip, vlan_id);
2130
2131         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2132                          NULL, slave_dev->dev_addr, NULL);
2133
2134         if (!skb) {
2135                 pr_err("ARP packet allocation failed\n");
2136                 return;
2137         }
2138         if (vlan_id) {
2139                 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2140                 if (!skb) {
2141                         pr_err("failed to insert VLAN tag\n");
2142                         return;
2143                 }
2144         }
2145         arp_xmit(skb);
2146 }
2147
2148
2149 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2150 {
2151         struct net_device *upper, *vlan_upper;
2152         struct list_head *iter, *vlan_iter;
2153         struct rtable *rt;
2154         __be32 *targets = bond->params.arp_targets, addr;
2155         int i, vlan_id;
2156
2157         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2158                 pr_debug("basa: target %pI4\n", &targets[i]);
2159
2160                 /* Find out through which dev should the packet go */
2161                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2162                                      RTO_ONLINK, 0);
2163                 if (IS_ERR(rt)) {
2164                         pr_debug("%s: no route to arp_ip_target %pI4\n",
2165                                  bond->dev->name, &targets[i]);
2166                         continue;
2167                 }
2168
2169                 vlan_id = 0;
2170
2171                 /* bond device itself */
2172                 if (rt->dst.dev == bond->dev)
2173                         goto found;
2174
2175                 rcu_read_lock();
2176                 /* first we search only for vlan devices. for every vlan
2177                  * found we verify its upper dev list, searching for the
2178                  * rt->dst.dev. If found we save the tag of the vlan and
2179                  * proceed to send the packet.
2180                  *
2181                  * TODO: QinQ?
2182                  */
2183                 netdev_for_each_all_upper_dev_rcu(bond->dev, vlan_upper,
2184                                                   vlan_iter) {
2185                         if (!is_vlan_dev(vlan_upper))
2186                                 continue;
2187                         netdev_for_each_all_upper_dev_rcu(vlan_upper, upper,
2188                                                           iter) {
2189                                 if (upper == rt->dst.dev) {
2190                                         vlan_id = vlan_dev_vlan_id(vlan_upper);
2191                                         rcu_read_unlock();
2192                                         goto found;
2193                                 }
2194                         }
2195                 }
2196
2197                 /* if the device we're looking for is not on top of any of
2198                  * our upper vlans, then just search for any dev that
2199                  * matches, and in case it's a vlan - save the id
2200                  */
2201                 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2202                         if (upper == rt->dst.dev) {
2203                                 /* if it's a vlan - get its VID */
2204                                 if (is_vlan_dev(upper))
2205                                         vlan_id = vlan_dev_vlan_id(upper);
2206
2207                                 rcu_read_unlock();
2208                                 goto found;
2209                         }
2210                 }
2211                 rcu_read_unlock();
2212
2213                 /* Not our device - skip */
2214                 pr_debug("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2215                          bond->dev->name, &targets[i],
2216                          rt->dst.dev ? rt->dst.dev->name : "NULL");
2217
2218                 ip_rt_put(rt);
2219                 continue;
2220
2221 found:
2222                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2223                 ip_rt_put(rt);
2224                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2225                               addr, vlan_id);
2226         }
2227 }
2228
2229 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2230 {
2231         int i;
2232
2233         if (!sip || !bond_has_this_ip(bond, tip)) {
2234                 pr_debug("bva: sip %pI4 tip %pI4 not found\n", &sip, &tip);
2235                 return;
2236         }
2237
2238         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2239         if (i == -1) {
2240                 pr_debug("bva: sip %pI4 not found in targets\n", &sip);
2241                 return;
2242         }
2243         slave->last_arp_rx = jiffies;
2244         slave->target_last_arp_rx[i] = jiffies;
2245 }
2246
2247 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2248                  struct slave *slave)
2249 {
2250         struct arphdr *arp = (struct arphdr *)skb->data;
2251         unsigned char *arp_ptr;
2252         __be32 sip, tip;
2253         int alen;
2254
2255         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2256                 return RX_HANDLER_ANOTHER;
2257
2258         read_lock(&bond->lock);
2259
2260         if (!slave_do_arp_validate(bond, slave))
2261                 goto out_unlock;
2262
2263         alen = arp_hdr_len(bond->dev);
2264
2265         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2266                  bond->dev->name, skb->dev->name);
2267
2268         if (alen > skb_headlen(skb)) {
2269                 arp = kmalloc(alen, GFP_ATOMIC);
2270                 if (!arp)
2271                         goto out_unlock;
2272                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2273                         goto out_unlock;
2274         }
2275
2276         if (arp->ar_hln != bond->dev->addr_len ||
2277             skb->pkt_type == PACKET_OTHERHOST ||
2278             skb->pkt_type == PACKET_LOOPBACK ||
2279             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2280             arp->ar_pro != htons(ETH_P_IP) ||
2281             arp->ar_pln != 4)
2282                 goto out_unlock;
2283
2284         arp_ptr = (unsigned char *)(arp + 1);
2285         arp_ptr += bond->dev->addr_len;
2286         memcpy(&sip, arp_ptr, 4);
2287         arp_ptr += 4 + bond->dev->addr_len;
2288         memcpy(&tip, arp_ptr, 4);
2289
2290         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2291                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2292                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2293                  &sip, &tip);
2294
2295         /*
2296          * Backup slaves won't see the ARP reply, but do come through
2297          * here for each ARP probe (so we swap the sip/tip to validate
2298          * the probe).  In a "redundant switch, common router" type of
2299          * configuration, the ARP probe will (hopefully) travel from
2300          * the active, through one switch, the router, then the other
2301          * switch before reaching the backup.
2302          *
2303          * We 'trust' the arp requests if there is an active slave and
2304          * it received valid arp reply(s) after it became active. This
2305          * is done to avoid endless looping when we can't reach the
2306          * arp_ip_target and fool ourselves with our own arp requests.
2307          */
2308         if (bond_is_active_slave(slave))
2309                 bond_validate_arp(bond, slave, sip, tip);
2310         else if (bond->curr_active_slave &&
2311                  time_after(slave_last_rx(bond, bond->curr_active_slave),
2312                             bond->curr_active_slave->jiffies))
2313                 bond_validate_arp(bond, slave, tip, sip);
2314
2315 out_unlock:
2316         read_unlock(&bond->lock);
2317         if (arp != (struct arphdr *)skb->data)
2318                 kfree(arp);
2319         return RX_HANDLER_ANOTHER;
2320 }
2321
2322 /* function to verify if we're in the arp_interval timeslice, returns true if
2323  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2324  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2325  */
2326 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2327                                   int mod)
2328 {
2329         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2330
2331         return time_in_range(jiffies,
2332                              last_act - delta_in_ticks,
2333                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2334 }
2335
2336 /*
2337  * this function is called regularly to monitor each slave's link
2338  * ensuring that traffic is being sent and received when arp monitoring
2339  * is used in load-balancing mode. if the adapter has been dormant, then an
2340  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2341  * arp monitoring in active backup mode.
2342  */
2343 static void bond_loadbalance_arp_mon(struct work_struct *work)
2344 {
2345         struct bonding *bond = container_of(work, struct bonding,
2346                                             arp_work.work);
2347         struct slave *slave, *oldcurrent;
2348         struct list_head *iter;
2349         int do_failover = 0, slave_state_changed = 0;
2350
2351         if (!bond_has_slaves(bond))
2352                 goto re_arm;
2353
2354         rcu_read_lock();
2355
2356         oldcurrent = ACCESS_ONCE(bond->curr_active_slave);
2357         /* see if any of the previous devices are up now (i.e. they have
2358          * xmt and rcv traffic). the curr_active_slave does not come into
2359          * the picture unless it is null. also, slave->jiffies is not needed
2360          * here because we send an arp on each slave and give a slave as
2361          * long as it needs to get the tx/rx within the delta.
2362          * TODO: what about up/down delay in arp mode? it wasn't here before
2363          *       so it can wait
2364          */
2365         bond_for_each_slave_rcu(bond, slave, iter) {
2366                 unsigned long trans_start = dev_trans_start(slave->dev);
2367
2368                 if (slave->link != BOND_LINK_UP) {
2369                         if (bond_time_in_interval(bond, trans_start, 1) &&
2370                             bond_time_in_interval(bond, slave->dev->last_rx, 1)) {
2371
2372                                 slave->link  = BOND_LINK_UP;
2373                                 slave_state_changed = 1;
2374
2375                                 /* primary_slave has no meaning in round-robin
2376                                  * mode. the window of a slave being up and
2377                                  * curr_active_slave being null after enslaving
2378                                  * is closed.
2379                                  */
2380                                 if (!oldcurrent) {
2381                                         pr_info("%s: link status definitely up for interface %s, ",
2382                                                 bond->dev->name,
2383                                                 slave->dev->name);
2384                                         do_failover = 1;
2385                                 } else {
2386                                         pr_info("%s: interface %s is now up\n",
2387                                                 bond->dev->name,
2388                                                 slave->dev->name);
2389                                 }
2390                         }
2391                 } else {
2392                         /* slave->link == BOND_LINK_UP */
2393
2394                         /* not all switches will respond to an arp request
2395                          * when the source ip is 0, so don't take the link down
2396                          * if we don't know our ip yet
2397                          */
2398                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2399                             !bond_time_in_interval(bond, slave->dev->last_rx, 2)) {
2400
2401                                 slave->link  = BOND_LINK_DOWN;
2402                                 slave_state_changed = 1;
2403
2404                                 if (slave->link_failure_count < UINT_MAX)
2405                                         slave->link_failure_count++;
2406
2407                                 pr_info("%s: interface %s is now down.\n",
2408                                         bond->dev->name,
2409                                         slave->dev->name);
2410
2411                                 if (slave == oldcurrent)
2412                                         do_failover = 1;
2413                         }
2414                 }
2415
2416                 /* note: if switch is in round-robin mode, all links
2417                  * must tx arp to ensure all links rx an arp - otherwise
2418                  * links may oscillate or not come up at all; if switch is
2419                  * in something like xor mode, there is nothing we can
2420                  * do - all replies will be rx'ed on same link causing slaves
2421                  * to be unstable during low/no traffic periods
2422                  */
2423                 if (IS_UP(slave->dev))
2424                         bond_arp_send_all(bond, slave);
2425         }
2426
2427         rcu_read_unlock();
2428
2429         if (do_failover || slave_state_changed) {
2430                 if (!rtnl_trylock())
2431                         goto re_arm;
2432
2433                 if (slave_state_changed) {
2434                         bond_slave_state_change(bond);
2435                 } else if (do_failover) {
2436                         /* the bond_select_active_slave must hold RTNL
2437                          * and curr_slave_lock for write.
2438                          */
2439                         block_netpoll_tx();
2440                         write_lock_bh(&bond->curr_slave_lock);
2441
2442                         bond_select_active_slave(bond);
2443
2444                         write_unlock_bh(&bond->curr_slave_lock);
2445                         unblock_netpoll_tx();
2446                 }
2447                 rtnl_unlock();
2448         }
2449
2450 re_arm:
2451         if (bond->params.arp_interval)
2452                 queue_delayed_work(bond->wq, &bond->arp_work,
2453                                    msecs_to_jiffies(bond->params.arp_interval));
2454 }
2455
2456 /*
2457  * Called to inspect slaves for active-backup mode ARP monitor link state
2458  * changes.  Sets new_link in slaves to specify what action should take
2459  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2460  * to link states must be committed.
2461  *
2462  * Called with rcu_read_lock hold.
2463  */
2464 static int bond_ab_arp_inspect(struct bonding *bond)
2465 {
2466         unsigned long trans_start, last_rx;
2467         struct list_head *iter;
2468         struct slave *slave;
2469         int commit = 0;
2470
2471         bond_for_each_slave_rcu(bond, slave, iter) {
2472                 slave->new_link = BOND_LINK_NOCHANGE;
2473                 last_rx = slave_last_rx(bond, slave);
2474
2475                 if (slave->link != BOND_LINK_UP) {
2476                         if (bond_time_in_interval(bond, last_rx, 1)) {
2477                                 slave->new_link = BOND_LINK_UP;
2478                                 commit++;
2479                         }
2480                         continue;
2481                 }
2482
2483                 /*
2484                  * Give slaves 2*delta after being enslaved or made
2485                  * active.  This avoids bouncing, as the last receive
2486                  * times need a full ARP monitor cycle to be updated.
2487                  */
2488                 if (bond_time_in_interval(bond, slave->jiffies, 2))
2489                         continue;
2490
2491                 /*
2492                  * Backup slave is down if:
2493                  * - No current_arp_slave AND
2494                  * - more than 3*delta since last receive AND
2495                  * - the bond has an IP address
2496                  *
2497                  * Note: a non-null current_arp_slave indicates
2498                  * the curr_active_slave went down and we are
2499                  * searching for a new one; under this condition
2500                  * we only take the curr_active_slave down - this
2501                  * gives each slave a chance to tx/rx traffic
2502                  * before being taken out
2503                  */
2504                 if (!bond_is_active_slave(slave) &&
2505                     !bond->current_arp_slave &&
2506                     !bond_time_in_interval(bond, last_rx, 3)) {
2507                         slave->new_link = BOND_LINK_DOWN;
2508                         commit++;
2509                 }
2510
2511                 /*
2512                  * Active slave is down if:
2513                  * - more than 2*delta since transmitting OR
2514                  * - (more than 2*delta since receive AND
2515                  *    the bond has an IP address)
2516                  */
2517                 trans_start = dev_trans_start(slave->dev);
2518                 if (bond_is_active_slave(slave) &&
2519                     (!bond_time_in_interval(bond, trans_start, 2) ||
2520                      !bond_time_in_interval(bond, last_rx, 2))) {
2521                         slave->new_link = BOND_LINK_DOWN;
2522                         commit++;
2523                 }
2524         }
2525
2526         return commit;
2527 }
2528
2529 /*
2530  * Called to commit link state changes noted by inspection step of
2531  * active-backup mode ARP monitor.
2532  *
2533  * Called with RTNL hold.
2534  */
2535 static void bond_ab_arp_commit(struct bonding *bond)
2536 {
2537         unsigned long trans_start;
2538         struct list_head *iter;
2539         struct slave *slave;
2540
2541         bond_for_each_slave(bond, slave, iter) {
2542                 switch (slave->new_link) {
2543                 case BOND_LINK_NOCHANGE:
2544                         continue;
2545
2546                 case BOND_LINK_UP:
2547                         trans_start = dev_trans_start(slave->dev);
2548                         if (bond->curr_active_slave != slave ||
2549                             (!bond->curr_active_slave &&
2550                              bond_time_in_interval(bond, trans_start, 1))) {
2551                                 slave->link = BOND_LINK_UP;
2552                                 if (bond->current_arp_slave) {
2553                                         bond_set_slave_inactive_flags(
2554                                                 bond->current_arp_slave);
2555                                         bond->current_arp_slave = NULL;
2556                                 }
2557
2558                                 pr_info("%s: link status definitely up for interface %s.\n",
2559                                         bond->dev->name, slave->dev->name);
2560
2561                                 if (!bond->curr_active_slave ||
2562                                     (slave == bond->primary_slave))
2563                                         goto do_failover;
2564
2565                         }
2566
2567                         continue;
2568
2569                 case BOND_LINK_DOWN:
2570                         if (slave->link_failure_count < UINT_MAX)
2571                                 slave->link_failure_count++;
2572
2573                         slave->link = BOND_LINK_DOWN;
2574                         bond_set_slave_inactive_flags(slave);
2575
2576                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2577                                 bond->dev->name, slave->dev->name);
2578
2579                         if (slave == bond->curr_active_slave) {
2580                                 bond->current_arp_slave = NULL;
2581                                 goto do_failover;
2582                         }
2583
2584                         continue;
2585
2586                 default:
2587                         pr_err("%s: impossible: new_link %d on slave %s\n",
2588                                bond->dev->name, slave->new_link,
2589                                slave->dev->name);
2590                         continue;
2591                 }
2592
2593 do_failover:
2594                 ASSERT_RTNL();
2595                 block_netpoll_tx();
2596                 write_lock_bh(&bond->curr_slave_lock);
2597                 bond_select_active_slave(bond);
2598                 write_unlock_bh(&bond->curr_slave_lock);
2599                 unblock_netpoll_tx();
2600         }
2601
2602         bond_set_carrier(bond);
2603 }
2604
2605 /*
2606  * Send ARP probes for active-backup mode ARP monitor.
2607  */
2608 static bool bond_ab_arp_probe(struct bonding *bond)
2609 {
2610         struct slave *slave, *before = NULL, *new_slave = NULL,
2611                      *curr_arp_slave, *curr_active_slave;
2612         struct list_head *iter;
2613         bool found = false;
2614
2615         rcu_read_lock();
2616         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2617         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2618
2619         if (curr_arp_slave && curr_active_slave)
2620                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
2621                         curr_arp_slave->dev->name,
2622                         curr_active_slave->dev->name);
2623
2624         if (curr_active_slave) {
2625                 bond_arp_send_all(bond, curr_active_slave);
2626                 rcu_read_unlock();
2627                 return true;
2628         }
2629         rcu_read_unlock();
2630
2631         /* if we don't have a curr_active_slave, search for the next available
2632          * backup slave from the current_arp_slave and make it the candidate
2633          * for becoming the curr_active_slave
2634          */
2635
2636         if (!rtnl_trylock())
2637                 return false;
2638         /* curr_arp_slave might have gone away */
2639         curr_arp_slave = ACCESS_ONCE(bond->current_arp_slave);
2640
2641         if (!curr_arp_slave) {
2642                 curr_arp_slave = bond_first_slave(bond);
2643                 if (!curr_arp_slave) {
2644                         rtnl_unlock();
2645                         return true;
2646                 }
2647         }
2648
2649         bond_set_slave_inactive_flags(curr_arp_slave);
2650
2651         bond_for_each_slave(bond, slave, iter) {
2652                 if (!found && !before && IS_UP(slave->dev))
2653                         before = slave;
2654
2655                 if (found && !new_slave && IS_UP(slave->dev))
2656                         new_slave = slave;
2657                 /* if the link state is up at this point, we
2658                  * mark it down - this can happen if we have
2659                  * simultaneous link failures and
2660                  * reselect_active_interface doesn't make this
2661                  * one the current slave so it is still marked
2662                  * up when it is actually down
2663                  */
2664                 if (!IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
2665                         slave->link = BOND_LINK_DOWN;
2666                         if (slave->link_failure_count < UINT_MAX)
2667                                 slave->link_failure_count++;
2668
2669                         bond_set_slave_inactive_flags(slave);
2670
2671                         pr_info("%s: backup interface %s is now down.\n",
2672                                 bond->dev->name, slave->dev->name);
2673                 }
2674                 if (slave == curr_arp_slave)
2675                         found = true;
2676         }
2677
2678         if (!new_slave && before)
2679                 new_slave = before;
2680
2681         if (!new_slave) {
2682                 rtnl_unlock();
2683                 return true;
2684         }
2685
2686         new_slave->link = BOND_LINK_BACK;
2687         bond_set_slave_active_flags(new_slave);
2688         bond_arp_send_all(bond, new_slave);
2689         new_slave->jiffies = jiffies;
2690         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2691         rtnl_unlock();
2692
2693         return true;
2694 }
2695
2696 static void bond_activebackup_arp_mon(struct work_struct *work)
2697 {
2698         struct bonding *bond = container_of(work, struct bonding,
2699                                             arp_work.work);
2700         bool should_notify_peers = false, should_commit = false;
2701         int delta_in_ticks;
2702
2703         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2704
2705         if (!bond_has_slaves(bond))
2706                 goto re_arm;
2707
2708         rcu_read_lock();
2709         should_notify_peers = bond_should_notify_peers(bond);
2710         should_commit = bond_ab_arp_inspect(bond);
2711         rcu_read_unlock();
2712
2713         if (should_commit) {
2714                 /* Race avoidance with bond_close flush of workqueue */
2715                 if (!rtnl_trylock()) {
2716                         delta_in_ticks = 1;
2717                         should_notify_peers = false;
2718                         goto re_arm;
2719                 }
2720
2721                 bond_ab_arp_commit(bond);
2722                 rtnl_unlock();
2723         }
2724
2725         if (!bond_ab_arp_probe(bond)) {
2726                 /* rtnl locking failed, re-arm */
2727                 delta_in_ticks = 1;
2728                 should_notify_peers = false;
2729         }
2730
2731 re_arm:
2732         if (bond->params.arp_interval)
2733                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2734
2735         if (should_notify_peers) {
2736                 if (!rtnl_trylock())
2737                         return;
2738                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2739                 rtnl_unlock();
2740         }
2741 }
2742
2743 /*-------------------------- netdev event handling --------------------------*/
2744
2745 /*
2746  * Change device name
2747  */
2748 static int bond_event_changename(struct bonding *bond)
2749 {
2750         bond_remove_proc_entry(bond);
2751         bond_create_proc_entry(bond);
2752
2753         bond_debug_reregister(bond);
2754
2755         return NOTIFY_DONE;
2756 }
2757
2758 static int bond_master_netdev_event(unsigned long event,
2759                                     struct net_device *bond_dev)
2760 {
2761         struct bonding *event_bond = netdev_priv(bond_dev);
2762
2763         switch (event) {
2764         case NETDEV_CHANGENAME:
2765                 return bond_event_changename(event_bond);
2766         case NETDEV_UNREGISTER:
2767                 bond_remove_proc_entry(event_bond);
2768                 break;
2769         case NETDEV_REGISTER:
2770                 bond_create_proc_entry(event_bond);
2771                 break;
2772         case NETDEV_NOTIFY_PEERS:
2773                 if (event_bond->send_peer_notif)
2774                         event_bond->send_peer_notif--;
2775                 break;
2776         default:
2777                 break;
2778         }
2779
2780         return NOTIFY_DONE;
2781 }
2782
2783 static int bond_slave_netdev_event(unsigned long event,
2784                                    struct net_device *slave_dev)
2785 {
2786         struct slave *slave = bond_slave_get_rtnl(slave_dev);
2787         struct bonding *bond;
2788         struct net_device *bond_dev;
2789         u32 old_speed;
2790         u8 old_duplex;
2791
2792         /* A netdev event can be generated while enslaving a device
2793          * before netdev_rx_handler_register is called in which case
2794          * slave will be NULL
2795          */
2796         if (!slave)
2797                 return NOTIFY_DONE;
2798         bond_dev = slave->bond->dev;
2799         bond = slave->bond;
2800
2801         switch (event) {
2802         case NETDEV_UNREGISTER:
2803                 if (bond_dev->type != ARPHRD_ETHER)
2804                         bond_release_and_destroy(bond_dev, slave_dev);
2805                 else
2806                         bond_release(bond_dev, slave_dev);
2807                 break;
2808         case NETDEV_UP:
2809         case NETDEV_CHANGE:
2810                 old_speed = slave->speed;
2811                 old_duplex = slave->duplex;
2812
2813                 bond_update_speed_duplex(slave);
2814
2815                 if (bond->params.mode == BOND_MODE_8023AD) {
2816                         if (old_speed != slave->speed)
2817                                 bond_3ad_adapter_speed_changed(slave);
2818                         if (old_duplex != slave->duplex)
2819                                 bond_3ad_adapter_duplex_changed(slave);
2820                 }
2821                 break;
2822         case NETDEV_DOWN:
2823                 /*
2824                  * ... Or is it this?
2825                  */
2826                 break;
2827         case NETDEV_CHANGEMTU:
2828                 /*
2829                  * TODO: Should slaves be allowed to
2830                  * independently alter their MTU?  For
2831                  * an active-backup bond, slaves need
2832                  * not be the same type of device, so
2833                  * MTUs may vary.  For other modes,
2834                  * slaves arguably should have the
2835                  * same MTUs. To do this, we'd need to
2836                  * take over the slave's change_mtu
2837                  * function for the duration of their
2838                  * servitude.
2839                  */
2840                 break;
2841         case NETDEV_CHANGENAME:
2842                 /* we don't care if we don't have primary set */
2843                 if (!USES_PRIMARY(bond->params.mode) ||
2844                     !bond->params.primary[0])
2845                         break;
2846
2847                 if (slave == bond->primary_slave) {
2848                         /* slave's name changed - he's no longer primary */
2849                         bond->primary_slave = NULL;
2850                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
2851                         /* we have a new primary slave */
2852                         bond->primary_slave = slave;
2853                 } else { /* we didn't change primary - exit */
2854                         break;
2855                 }
2856
2857                 pr_info("%s: Primary slave changed to %s, reselecting active slave.\n",
2858                         bond->dev->name, bond->primary_slave ? slave_dev->name :
2859                                                                "none");
2860                 write_lock_bh(&bond->curr_slave_lock);
2861                 bond_select_active_slave(bond);
2862                 write_unlock_bh(&bond->curr_slave_lock);
2863                 break;
2864         case NETDEV_FEAT_CHANGE:
2865                 bond_compute_features(bond);
2866                 break;
2867         case NETDEV_RESEND_IGMP:
2868                 /* Propagate to master device */
2869                 call_netdevice_notifiers(event, slave->bond->dev);
2870                 break;
2871         default:
2872                 break;
2873         }
2874
2875         return NOTIFY_DONE;
2876 }
2877
2878 /*
2879  * bond_netdev_event: handle netdev notifier chain events.
2880  *
2881  * This function receives events for the netdev chain.  The caller (an
2882  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
2883  * locks for us to safely manipulate the slave devices (RTNL lock,
2884  * dev_probe_lock).
2885  */
2886 static int bond_netdev_event(struct notifier_block *this,
2887                              unsigned long event, void *ptr)
2888 {
2889         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2890
2891         pr_debug("event_dev: %s, event: %lx\n",
2892                  event_dev ? event_dev->name : "None",
2893                  event);
2894
2895         if (!(event_dev->priv_flags & IFF_BONDING))
2896                 return NOTIFY_DONE;
2897
2898         if (event_dev->flags & IFF_MASTER) {
2899                 pr_debug("IFF_MASTER\n");
2900                 return bond_master_netdev_event(event, event_dev);
2901         }
2902
2903         if (event_dev->flags & IFF_SLAVE) {
2904                 pr_debug("IFF_SLAVE\n");
2905                 return bond_slave_netdev_event(event, event_dev);
2906         }
2907
2908         return NOTIFY_DONE;
2909 }
2910
2911 static struct notifier_block bond_netdev_notifier = {
2912         .notifier_call = bond_netdev_event,
2913 };
2914
2915 /*---------------------------- Hashing Policies -----------------------------*/
2916
2917 /* L2 hash helper */
2918 static inline u32 bond_eth_hash(struct sk_buff *skb)
2919 {
2920         struct ethhdr *data = (struct ethhdr *)skb->data;
2921
2922         if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
2923                 return data->h_dest[5] ^ data->h_source[5];
2924
2925         return 0;
2926 }
2927
2928 /* Extract the appropriate headers based on bond's xmit policy */
2929 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
2930                               struct flow_keys *fk)
2931 {
2932         const struct ipv6hdr *iph6;
2933         const struct iphdr *iph;
2934         int noff, proto = -1;
2935
2936         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
2937                 return skb_flow_dissect(skb, fk);
2938
2939         fk->ports = 0;
2940         noff = skb_network_offset(skb);
2941         if (skb->protocol == htons(ETH_P_IP)) {
2942                 if (!pskb_may_pull(skb, noff + sizeof(*iph)))
2943                         return false;
2944                 iph = ip_hdr(skb);
2945                 fk->src = iph->saddr;
2946                 fk->dst = iph->daddr;
2947                 noff += iph->ihl << 2;
2948                 if (!ip_is_fragment(iph))
2949                         proto = iph->protocol;
2950         } else if (skb->protocol == htons(ETH_P_IPV6)) {
2951                 if (!pskb_may_pull(skb, noff + sizeof(*iph6)))
2952                         return false;
2953                 iph6 = ipv6_hdr(skb);
2954                 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
2955                 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
2956                 noff += sizeof(*iph6);
2957                 proto = iph6->nexthdr;
2958         } else {
2959                 return false;
2960         }
2961         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
2962                 fk->ports = skb_flow_get_ports(skb, noff, proto);
2963
2964         return true;
2965 }
2966
2967 /**
2968  * bond_xmit_hash - generate a hash value based on the xmit policy
2969  * @bond: bonding device
2970  * @skb: buffer to use for headers
2971  * @count: modulo value
2972  *
2973  * This function will extract the necessary headers from the skb buffer and use
2974  * them to generate a hash based on the xmit_policy set in the bonding device
2975  * which will be reduced modulo count before returning.
2976  */
2977 int bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, int count)
2978 {
2979         struct flow_keys flow;
2980         u32 hash;
2981
2982         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
2983             !bond_flow_dissect(bond, skb, &flow))
2984                 return bond_eth_hash(skb) % count;
2985
2986         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
2987             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
2988                 hash = bond_eth_hash(skb);
2989         else
2990                 hash = (__force u32)flow.ports;
2991         hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
2992         hash ^= (hash >> 16);
2993         hash ^= (hash >> 8);
2994
2995         return hash % count;
2996 }
2997
2998 /*-------------------------- Device entry points ----------------------------*/
2999
3000 static void bond_work_init_all(struct bonding *bond)
3001 {
3002         INIT_DELAYED_WORK(&bond->mcast_work,
3003                           bond_resend_igmp_join_requests_delayed);
3004         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3005         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3006         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3007                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3008         else
3009                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3010         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3011 }
3012
3013 static void bond_work_cancel_all(struct bonding *bond)
3014 {
3015         cancel_delayed_work_sync(&bond->mii_work);
3016         cancel_delayed_work_sync(&bond->arp_work);
3017         cancel_delayed_work_sync(&bond->alb_work);
3018         cancel_delayed_work_sync(&bond->ad_work);
3019         cancel_delayed_work_sync(&bond->mcast_work);
3020 }
3021
3022 static int bond_open(struct net_device *bond_dev)
3023 {
3024         struct bonding *bond = netdev_priv(bond_dev);
3025         struct list_head *iter;
3026         struct slave *slave;
3027
3028         /* reset slave->backup and slave->inactive */
3029         read_lock(&bond->lock);
3030         if (bond_has_slaves(bond)) {
3031                 read_lock(&bond->curr_slave_lock);
3032                 bond_for_each_slave(bond, slave, iter) {
3033                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3034                                 && (slave != bond->curr_active_slave)) {
3035                                 bond_set_slave_inactive_flags(slave);
3036                         } else {
3037                                 bond_set_slave_active_flags(slave);
3038                         }
3039                 }
3040                 read_unlock(&bond->curr_slave_lock);
3041         }
3042         read_unlock(&bond->lock);
3043
3044         bond_work_init_all(bond);
3045
3046         if (bond_is_lb(bond)) {
3047                 /* bond_alb_initialize must be called before the timer
3048                  * is started.
3049                  */
3050                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3051                         return -ENOMEM;
3052                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3053         }
3054
3055         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3056                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3057
3058         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3059                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3060                 if (bond->params.arp_validate)
3061                         bond->recv_probe = bond_arp_rcv;
3062         }
3063
3064         if (bond->params.mode == BOND_MODE_8023AD) {
3065                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3066                 /* register to receive LACPDUs */
3067                 bond->recv_probe = bond_3ad_lacpdu_recv;
3068                 bond_3ad_initiate_agg_selection(bond, 1);
3069         }
3070
3071         return 0;
3072 }
3073
3074 static int bond_close(struct net_device *bond_dev)
3075 {
3076         struct bonding *bond = netdev_priv(bond_dev);
3077
3078         bond_work_cancel_all(bond);
3079         bond->send_peer_notif = 0;
3080         if (bond_is_lb(bond))
3081                 bond_alb_deinitialize(bond);
3082         bond->recv_probe = NULL;
3083
3084         return 0;
3085 }
3086
3087 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3088                                                 struct rtnl_link_stats64 *stats)
3089 {
3090         struct bonding *bond = netdev_priv(bond_dev);
3091         struct rtnl_link_stats64 temp;
3092         struct list_head *iter;
3093         struct slave *slave;
3094
3095         memset(stats, 0, sizeof(*stats));
3096
3097         read_lock_bh(&bond->lock);
3098         bond_for_each_slave(bond, slave, iter) {
3099                 const struct rtnl_link_stats64 *sstats =
3100                         dev_get_stats(slave->dev, &temp);
3101
3102                 stats->rx_packets += sstats->rx_packets;
3103                 stats->rx_bytes += sstats->rx_bytes;
3104                 stats->rx_errors += sstats->rx_errors;
3105                 stats->rx_dropped += sstats->rx_dropped;
3106
3107                 stats->tx_packets += sstats->tx_packets;
3108                 stats->tx_bytes += sstats->tx_bytes;
3109                 stats->tx_errors += sstats->tx_errors;
3110                 stats->tx_dropped += sstats->tx_dropped;
3111
3112                 stats->multicast += sstats->multicast;
3113                 stats->collisions += sstats->collisions;
3114
3115                 stats->rx_length_errors += sstats->rx_length_errors;
3116                 stats->rx_over_errors += sstats->rx_over_errors;
3117                 stats->rx_crc_errors += sstats->rx_crc_errors;
3118                 stats->rx_frame_errors += sstats->rx_frame_errors;
3119                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3120                 stats->rx_missed_errors += sstats->rx_missed_errors;
3121
3122                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3123                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3124                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3125                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3126                 stats->tx_window_errors += sstats->tx_window_errors;
3127         }
3128         read_unlock_bh(&bond->lock);
3129
3130         return stats;
3131 }
3132
3133 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3134 {
3135         struct bonding *bond = netdev_priv(bond_dev);
3136         struct net_device *slave_dev = NULL;
3137         struct ifbond k_binfo;
3138         struct ifbond __user *u_binfo = NULL;
3139         struct ifslave k_sinfo;
3140         struct ifslave __user *u_sinfo = NULL;
3141         struct mii_ioctl_data *mii = NULL;
3142         struct bond_opt_value newval;
3143         struct net *net;
3144         int res = 0;
3145
3146         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3147
3148         switch (cmd) {
3149         case SIOCGMIIPHY:
3150                 mii = if_mii(ifr);
3151                 if (!mii)
3152                         return -EINVAL;
3153
3154                 mii->phy_id = 0;
3155                 /* Fall Through */
3156         case SIOCGMIIREG:
3157                 /*
3158                  * We do this again just in case we were called by SIOCGMIIREG
3159                  * instead of SIOCGMIIPHY.
3160                  */
3161                 mii = if_mii(ifr);
3162                 if (!mii)
3163                         return -EINVAL;
3164
3165
3166                 if (mii->reg_num == 1) {
3167                         mii->val_out = 0;
3168                         read_lock(&bond->lock);
3169                         read_lock(&bond->curr_slave_lock);
3170                         if (netif_carrier_ok(bond->dev))
3171                                 mii->val_out = BMSR_LSTATUS;
3172
3173                         read_unlock(&bond->curr_slave_lock);
3174                         read_unlock(&bond->lock);
3175                 }
3176
3177                 return 0;
3178         case BOND_INFO_QUERY_OLD:
3179         case SIOCBONDINFOQUERY:
3180                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3181
3182                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3183                         return -EFAULT;
3184
3185                 res = bond_info_query(bond_dev, &k_binfo);
3186                 if (res == 0 &&
3187                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3188                         return -EFAULT;
3189
3190                 return res;
3191         case BOND_SLAVE_INFO_QUERY_OLD:
3192         case SIOCBONDSLAVEINFOQUERY:
3193                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3194
3195                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3196                         return -EFAULT;
3197
3198                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3199                 if (res == 0 &&
3200                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3201                         return -EFAULT;
3202
3203                 return res;
3204         default:
3205                 /* Go on */
3206                 break;
3207         }
3208
3209         net = dev_net(bond_dev);
3210
3211         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3212                 return -EPERM;
3213
3214         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3215
3216         pr_debug("slave_dev=%p:\n", slave_dev);
3217
3218         if (!slave_dev)
3219                 return -ENODEV;
3220
3221         pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3222         switch (cmd) {
3223         case BOND_ENSLAVE_OLD:
3224         case SIOCBONDENSLAVE:
3225                 res = bond_enslave(bond_dev, slave_dev);
3226                 break;
3227         case BOND_RELEASE_OLD:
3228         case SIOCBONDRELEASE:
3229                 res = bond_release(bond_dev, slave_dev);
3230                 break;
3231         case BOND_SETHWADDR_OLD:
3232         case SIOCBONDSETHWADDR:
3233                 bond_set_dev_addr(bond_dev, slave_dev);
3234                 res = 0;
3235                 break;
3236         case BOND_CHANGE_ACTIVE_OLD:
3237         case SIOCBONDCHANGEACTIVE:
3238                 bond_opt_initstr(&newval, slave_dev->name);
3239                 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3240                 break;
3241         default:
3242                 res = -EOPNOTSUPP;
3243         }
3244
3245         return res;
3246 }
3247
3248 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3249 {
3250         struct bonding *bond = netdev_priv(bond_dev);
3251
3252         if (change & IFF_PROMISC)
3253                 bond_set_promiscuity(bond,
3254                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3255
3256         if (change & IFF_ALLMULTI)
3257                 bond_set_allmulti(bond,
3258                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3259 }
3260
3261 static void bond_set_rx_mode(struct net_device *bond_dev)
3262 {
3263         struct bonding *bond = netdev_priv(bond_dev);
3264         struct list_head *iter;
3265         struct slave *slave;
3266
3267
3268         rcu_read_lock();
3269         if (USES_PRIMARY(bond->params.mode)) {
3270                 slave = rcu_dereference(bond->curr_active_slave);
3271                 if (slave) {
3272                         dev_uc_sync(slave->dev, bond_dev);
3273                         dev_mc_sync(slave->dev, bond_dev);
3274                 }
3275         } else {
3276                 bond_for_each_slave_rcu(bond, slave, iter) {
3277                         dev_uc_sync_multiple(slave->dev, bond_dev);
3278                         dev_mc_sync_multiple(slave->dev, bond_dev);
3279                 }
3280         }
3281         rcu_read_unlock();
3282 }
3283
3284 static int bond_neigh_init(struct neighbour *n)
3285 {
3286         struct bonding *bond = netdev_priv(n->dev);
3287         const struct net_device_ops *slave_ops;
3288         struct neigh_parms parms;
3289         struct slave *slave;
3290         int ret;
3291
3292         slave = bond_first_slave(bond);
3293         if (!slave)
3294                 return 0;
3295         slave_ops = slave->dev->netdev_ops;
3296         if (!slave_ops->ndo_neigh_setup)
3297                 return 0;
3298
3299         parms.neigh_setup = NULL;
3300         parms.neigh_cleanup = NULL;
3301         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3302         if (ret)
3303                 return ret;
3304
3305         /*
3306          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3307          * after the last slave has been detached.  Assumes that all slaves
3308          * utilize the same neigh_cleanup (true at this writing as only user
3309          * is ipoib).
3310          */
3311         n->parms->neigh_cleanup = parms.neigh_cleanup;
3312
3313         if (!parms.neigh_setup)
3314                 return 0;
3315
3316         return parms.neigh_setup(n);
3317 }
3318
3319 /*
3320  * The bonding ndo_neigh_setup is called at init time beofre any
3321  * slave exists. So we must declare proxy setup function which will
3322  * be used at run time to resolve the actual slave neigh param setup.
3323  *
3324  * It's also called by master devices (such as vlans) to setup their
3325  * underlying devices. In that case - do nothing, we're already set up from
3326  * our init.
3327  */
3328 static int bond_neigh_setup(struct net_device *dev,
3329                             struct neigh_parms *parms)
3330 {
3331         /* modify only our neigh_parms */
3332         if (parms->dev == dev)
3333                 parms->neigh_setup = bond_neigh_init;
3334
3335         return 0;
3336 }
3337
3338 /*
3339  * Change the MTU of all of a master's slaves to match the master
3340  */
3341 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3342 {
3343         struct bonding *bond = netdev_priv(bond_dev);
3344         struct slave *slave, *rollback_slave;
3345         struct list_head *iter;
3346         int res = 0;
3347
3348         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3349                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3350
3351         /* Can't hold bond->lock with bh disabled here since
3352          * some base drivers panic. On the other hand we can't
3353          * hold bond->lock without bh disabled because we'll
3354          * deadlock. The only solution is to rely on the fact
3355          * that we're under rtnl_lock here, and the slaves
3356          * list won't change. This doesn't solve the problem
3357          * of setting the slave's MTU while it is
3358          * transmitting, but the assumption is that the base
3359          * driver can handle that.
3360          *
3361          * TODO: figure out a way to safely iterate the slaves
3362          * list, but without holding a lock around the actual
3363          * call to the base driver.
3364          */
3365
3366         bond_for_each_slave(bond, slave, iter) {
3367                 pr_debug("s %p c_m %p\n",
3368                          slave,
3369                          slave->dev->netdev_ops->ndo_change_mtu);
3370
3371                 res = dev_set_mtu(slave->dev, new_mtu);
3372
3373                 if (res) {
3374                         /* If we failed to set the slave's mtu to the new value
3375                          * we must abort the operation even in ACTIVE_BACKUP
3376                          * mode, because if we allow the backup slaves to have
3377                          * different mtu values than the active slave we'll
3378                          * need to change their mtu when doing a failover. That
3379                          * means changing their mtu from timer context, which
3380                          * is probably not a good idea.
3381                          */
3382                         pr_debug("err %d %s\n", res, slave->dev->name);
3383                         goto unwind;
3384                 }
3385         }
3386
3387         bond_dev->mtu = new_mtu;
3388
3389         return 0;
3390
3391 unwind:
3392         /* unwind from head to the slave that failed */
3393         bond_for_each_slave(bond, rollback_slave, iter) {
3394                 int tmp_res;
3395
3396                 if (rollback_slave == slave)
3397                         break;
3398
3399                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3400                 if (tmp_res) {
3401                         pr_debug("unwind err %d dev %s\n",
3402                                  tmp_res, rollback_slave->dev->name);
3403                 }
3404         }
3405
3406         return res;
3407 }
3408
3409 /*
3410  * Change HW address
3411  *
3412  * Note that many devices must be down to change the HW address, and
3413  * downing the master releases all slaves.  We can make bonds full of
3414  * bonding devices to test this, however.
3415  */
3416 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3417 {
3418         struct bonding *bond = netdev_priv(bond_dev);
3419         struct slave *slave, *rollback_slave;
3420         struct sockaddr *sa = addr, tmp_sa;
3421         struct list_head *iter;
3422         int res = 0;
3423
3424         if (bond->params.mode == BOND_MODE_ALB)
3425                 return bond_alb_set_mac_address(bond_dev, addr);
3426
3427
3428         pr_debug("bond=%p, name=%s\n",
3429                  bond, bond_dev ? bond_dev->name : "None");
3430
3431         /* If fail_over_mac is enabled, do nothing and return success.
3432          * Returning an error causes ifenslave to fail.
3433          */
3434         if (bond->params.fail_over_mac)
3435                 return 0;
3436
3437         if (!is_valid_ether_addr(sa->sa_data))
3438                 return -EADDRNOTAVAIL;
3439
3440         /* Can't hold bond->lock with bh disabled here since
3441          * some base drivers panic. On the other hand we can't
3442          * hold bond->lock without bh disabled because we'll
3443          * deadlock. The only solution is to rely on the fact
3444          * that we're under rtnl_lock here, and the slaves
3445          * list won't change. This doesn't solve the problem
3446          * of setting the slave's hw address while it is
3447          * transmitting, but the assumption is that the base
3448          * driver can handle that.
3449          *
3450          * TODO: figure out a way to safely iterate the slaves
3451          * list, but without holding a lock around the actual
3452          * call to the base driver.
3453          */
3454
3455         bond_for_each_slave(bond, slave, iter) {
3456                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3457                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3458
3459                 if (slave_ops->ndo_set_mac_address == NULL) {
3460                         res = -EOPNOTSUPP;
3461                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3462                         goto unwind;
3463                 }
3464
3465                 res = dev_set_mac_address(slave->dev, addr);
3466                 if (res) {
3467                         /* TODO: consider downing the slave
3468                          * and retry ?
3469                          * User should expect communications
3470                          * breakage anyway until ARP finish
3471                          * updating, so...
3472                          */
3473                         pr_debug("err %d %s\n", res, slave->dev->name);
3474                         goto unwind;
3475                 }
3476         }
3477
3478         /* success */
3479         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3480         return 0;
3481
3482 unwind:
3483         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3484         tmp_sa.sa_family = bond_dev->type;
3485
3486         /* unwind from head to the slave that failed */
3487         bond_for_each_slave(bond, rollback_slave, iter) {
3488                 int tmp_res;
3489
3490                 if (rollback_slave == slave)
3491                         break;
3492
3493                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3494                 if (tmp_res) {
3495                         pr_debug("unwind err %d dev %s\n",
3496                                  tmp_res, rollback_slave->dev->name);
3497                 }
3498         }
3499
3500         return res;
3501 }
3502
3503 /**
3504  * bond_xmit_slave_id - transmit skb through slave with slave_id
3505  * @bond: bonding device that is transmitting
3506  * @skb: buffer to transmit
3507  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3508  *
3509  * This function tries to transmit through slave with slave_id but in case
3510  * it fails, it tries to find the first available slave for transmission.
3511  * The skb is consumed in all cases, thus the function is void.
3512  */
3513 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3514 {
3515         struct list_head *iter;
3516         struct slave *slave;
3517         int i = slave_id;
3518
3519         /* Here we start from the slave with slave_id */
3520         bond_for_each_slave_rcu(bond, slave, iter) {
3521                 if (--i < 0) {
3522                         if (slave_can_tx(slave)) {
3523                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3524                                 return;
3525                         }
3526                 }
3527         }
3528
3529         /* Here we start from the first slave up to slave_id */
3530         i = slave_id;
3531         bond_for_each_slave_rcu(bond, slave, iter) {
3532                 if (--i < 0)
3533                         break;
3534                 if (slave_can_tx(slave)) {
3535                         bond_dev_queue_xmit(bond, skb, slave->dev);
3536                         return;
3537                 }
3538         }
3539         /* no slave that can tx has been found */
3540         kfree_skb(skb);
3541 }
3542
3543 /**
3544  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3545  * @bond: bonding device to use
3546  *
3547  * Based on the value of the bonding device's packets_per_slave parameter
3548  * this function generates a slave id, which is usually used as the next
3549  * slave to transmit through.
3550  */
3551 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3552 {
3553         u32 slave_id;
3554         struct reciprocal_value reciprocal_packets_per_slave;
3555         int packets_per_slave = bond->params.packets_per_slave;
3556
3557         switch (packets_per_slave) {
3558         case 0:
3559                 slave_id = prandom_u32();
3560                 break;
3561         case 1:
3562                 slave_id = bond->rr_tx_counter;
3563                 break;
3564         default:
3565                 reciprocal_packets_per_slave =
3566                         bond->params.reciprocal_packets_per_slave;
3567                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3568                                              reciprocal_packets_per_slave);
3569                 break;
3570         }
3571         bond->rr_tx_counter++;
3572
3573         return slave_id;
3574 }
3575
3576 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3577 {
3578         struct bonding *bond = netdev_priv(bond_dev);
3579         struct iphdr *iph = ip_hdr(skb);
3580         struct slave *slave;
3581         u32 slave_id;
3582
3583         /* Start with the curr_active_slave that joined the bond as the
3584          * default for sending IGMP traffic.  For failover purposes one
3585          * needs to maintain some consistency for the interface that will
3586          * send the join/membership reports.  The curr_active_slave found
3587          * will send all of this type of traffic.
3588          */
3589         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3590                 slave = rcu_dereference(bond->curr_active_slave);
3591                 if (slave && slave_can_tx(slave))
3592                         bond_dev_queue_xmit(bond, skb, slave->dev);
3593                 else
3594                         bond_xmit_slave_id(bond, skb, 0);
3595         } else {
3596                 slave_id = bond_rr_gen_slave_id(bond);
3597                 bond_xmit_slave_id(bond, skb, slave_id % bond->slave_cnt);
3598         }
3599
3600         return NETDEV_TX_OK;
3601 }
3602
3603 /*
3604  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3605  * the bond has a usable interface.
3606  */
3607 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3608 {
3609         struct bonding *bond = netdev_priv(bond_dev);
3610         struct slave *slave;
3611
3612         slave = rcu_dereference(bond->curr_active_slave);
3613         if (slave)
3614                 bond_dev_queue_xmit(bond, skb, slave->dev);
3615         else
3616                 kfree_skb(skb);
3617
3618         return NETDEV_TX_OK;
3619 }
3620
3621 /* In bond_xmit_xor() , we determine the output device by using a pre-
3622  * determined xmit_hash_policy(), If the selected device is not enabled,
3623  * find the next active slave.
3624  */
3625 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3626 {
3627         struct bonding *bond = netdev_priv(bond_dev);
3628
3629         bond_xmit_slave_id(bond, skb, bond_xmit_hash(bond, skb, bond->slave_cnt));
3630
3631         return NETDEV_TX_OK;
3632 }
3633
3634 /* in broadcast mode, we send everything to all usable interfaces. */
3635 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3636 {
3637         struct bonding *bond = netdev_priv(bond_dev);
3638         struct slave *slave = NULL;
3639         struct list_head *iter;
3640
3641         bond_for_each_slave_rcu(bond, slave, iter) {
3642                 if (bond_is_last_slave(bond, slave))
3643                         break;
3644                 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
3645                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3646
3647                         if (!skb2) {
3648                                 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
3649                                        bond_dev->name);
3650                                 continue;
3651                         }
3652                         /* bond_dev_queue_xmit always returns 0 */
3653                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3654                 }
3655         }
3656         if (slave && IS_UP(slave->dev) && slave->link == BOND_LINK_UP)
3657                 bond_dev_queue_xmit(bond, skb, slave->dev);
3658         else
3659                 kfree_skb(skb);
3660
3661         return NETDEV_TX_OK;
3662 }
3663
3664 /*------------------------- Device initialization ---------------------------*/
3665
3666 /*
3667  * Lookup the slave that corresponds to a qid
3668  */
3669 static inline int bond_slave_override(struct bonding *bond,
3670                                       struct sk_buff *skb)
3671 {
3672         struct slave *slave = NULL;
3673         struct list_head *iter;
3674
3675         if (!skb->queue_mapping)
3676                 return 1;
3677
3678         /* Find out if any slaves have the same mapping as this skb. */
3679         bond_for_each_slave_rcu(bond, slave, iter) {
3680                 if (slave->queue_id == skb->queue_mapping) {
3681                         if (slave_can_tx(slave)) {
3682                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3683                                 return 0;
3684                         }
3685                         /* If the slave isn't UP, use default transmit policy. */
3686                         break;
3687                 }
3688         }
3689
3690         return 1;
3691 }
3692
3693
3694 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3695                              void *accel_priv)
3696 {
3697         /*
3698          * This helper function exists to help dev_pick_tx get the correct
3699          * destination queue.  Using a helper function skips a call to
3700          * skb_tx_hash and will put the skbs in the queue we expect on their
3701          * way down to the bonding driver.
3702          */
3703         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3704
3705         /*
3706          * Save the original txq to restore before passing to the driver
3707          */
3708         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3709
3710         if (unlikely(txq >= dev->real_num_tx_queues)) {
3711                 do {
3712                         txq -= dev->real_num_tx_queues;
3713                 } while (txq >= dev->real_num_tx_queues);
3714         }
3715         return txq;
3716 }
3717
3718 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3719 {
3720         struct bonding *bond = netdev_priv(dev);
3721
3722         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
3723                 if (!bond_slave_override(bond, skb))
3724                         return NETDEV_TX_OK;
3725         }
3726
3727         switch (bond->params.mode) {
3728         case BOND_MODE_ROUNDROBIN:
3729                 return bond_xmit_roundrobin(skb, dev);
3730         case BOND_MODE_ACTIVEBACKUP:
3731                 return bond_xmit_activebackup(skb, dev);
3732         case BOND_MODE_XOR:
3733                 return bond_xmit_xor(skb, dev);
3734         case BOND_MODE_BROADCAST:
3735                 return bond_xmit_broadcast(skb, dev);
3736         case BOND_MODE_8023AD:
3737                 return bond_3ad_xmit_xor(skb, dev);
3738         case BOND_MODE_ALB:
3739         case BOND_MODE_TLB:
3740                 return bond_alb_xmit(skb, dev);
3741         default:
3742                 /* Should never happen, mode already checked */
3743                 pr_err("%s: Error: Unknown bonding mode %d\n",
3744                        dev->name, bond->params.mode);
3745                 WARN_ON_ONCE(1);
3746                 kfree_skb(skb);
3747                 return NETDEV_TX_OK;
3748         }
3749 }
3750
3751 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3752 {
3753         struct bonding *bond = netdev_priv(dev);
3754         netdev_tx_t ret = NETDEV_TX_OK;
3755
3756         /*
3757          * If we risk deadlock from transmitting this in the
3758          * netpoll path, tell netpoll to queue the frame for later tx
3759          */
3760         if (is_netpoll_tx_blocked(dev))
3761                 return NETDEV_TX_BUSY;
3762
3763         rcu_read_lock();
3764         if (bond_has_slaves(bond))
3765                 ret = __bond_start_xmit(skb, dev);
3766         else
3767                 kfree_skb(skb);
3768         rcu_read_unlock();
3769
3770         return ret;
3771 }
3772
3773 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3774                                      struct ethtool_cmd *ecmd)
3775 {
3776         struct bonding *bond = netdev_priv(bond_dev);
3777         unsigned long speed = 0;
3778         struct list_head *iter;
3779         struct slave *slave;
3780
3781         ecmd->duplex = DUPLEX_UNKNOWN;
3782         ecmd->port = PORT_OTHER;
3783
3784         /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
3785          * do not need to check mode.  Though link speed might not represent
3786          * the true receive or transmit bandwidth (not all modes are symmetric)
3787          * this is an accurate maximum.
3788          */
3789         read_lock(&bond->lock);
3790         bond_for_each_slave(bond, slave, iter) {
3791                 if (SLAVE_IS_OK(slave)) {
3792                         if (slave->speed != SPEED_UNKNOWN)
3793                                 speed += slave->speed;
3794                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
3795                             slave->duplex != DUPLEX_UNKNOWN)
3796                                 ecmd->duplex = slave->duplex;
3797                 }
3798         }
3799         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3800         read_unlock(&bond->lock);
3801
3802         return 0;
3803 }
3804
3805 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3806                                      struct ethtool_drvinfo *drvinfo)
3807 {
3808         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3809         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3810         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3811                  BOND_ABI_VERSION);
3812 }
3813
3814 static const struct ethtool_ops bond_ethtool_ops = {
3815         .get_drvinfo            = bond_ethtool_get_drvinfo,
3816         .get_settings           = bond_ethtool_get_settings,
3817         .get_link               = ethtool_op_get_link,
3818 };
3819
3820 static const struct net_device_ops bond_netdev_ops = {
3821         .ndo_init               = bond_init,
3822         .ndo_uninit             = bond_uninit,
3823         .ndo_open               = bond_open,
3824         .ndo_stop               = bond_close,
3825         .ndo_start_xmit         = bond_start_xmit,
3826         .ndo_select_queue       = bond_select_queue,
3827         .ndo_get_stats64        = bond_get_stats,
3828         .ndo_do_ioctl           = bond_do_ioctl,
3829         .ndo_change_rx_flags    = bond_change_rx_flags,
3830         .ndo_set_rx_mode        = bond_set_rx_mode,
3831         .ndo_change_mtu         = bond_change_mtu,
3832         .ndo_set_mac_address    = bond_set_mac_address,
3833         .ndo_neigh_setup        = bond_neigh_setup,
3834         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
3835         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
3836 #ifdef CONFIG_NET_POLL_CONTROLLER
3837         .ndo_netpoll_setup      = bond_netpoll_setup,
3838         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
3839         .ndo_poll_controller    = bond_poll_controller,
3840 #endif
3841         .ndo_add_slave          = bond_enslave,
3842         .ndo_del_slave          = bond_release,
3843         .ndo_fix_features       = bond_fix_features,
3844 };
3845
3846 static const struct device_type bond_type = {
3847         .name = "bond",
3848 };
3849
3850 static void bond_destructor(struct net_device *bond_dev)
3851 {
3852         struct bonding *bond = netdev_priv(bond_dev);
3853         if (bond->wq)
3854                 destroy_workqueue(bond->wq);
3855         free_netdev(bond_dev);
3856 }
3857
3858 void bond_setup(struct net_device *bond_dev)
3859 {
3860         struct bonding *bond = netdev_priv(bond_dev);
3861
3862         /* initialize rwlocks */
3863         rwlock_init(&bond->lock);
3864         rwlock_init(&bond->curr_slave_lock);
3865         bond->params = bonding_defaults;
3866
3867         /* Initialize pointers */
3868         bond->dev = bond_dev;
3869
3870         /* Initialize the device entry points */
3871         ether_setup(bond_dev);
3872         bond_dev->netdev_ops = &bond_netdev_ops;
3873         bond_dev->ethtool_ops = &bond_ethtool_ops;
3874
3875         bond_dev->destructor = bond_destructor;
3876
3877         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
3878
3879         /* Initialize the device options */
3880         bond_dev->tx_queue_len = 0;
3881         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
3882         bond_dev->priv_flags |= IFF_BONDING;
3883         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
3884
3885         /* At first, we block adding VLANs. That's the only way to
3886          * prevent problems that occur when adding VLANs over an
3887          * empty bond. The block will be removed once non-challenged
3888          * slaves are enslaved.
3889          */
3890         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
3891
3892         /* don't acquire bond device's netif_tx_lock when
3893          * transmitting */
3894         bond_dev->features |= NETIF_F_LLTX;
3895
3896         /* By default, we declare the bond to be fully
3897          * VLAN hardware accelerated capable. Special
3898          * care is taken in the various xmit functions
3899          * when there are slaves that are not hw accel
3900          * capable
3901          */
3902
3903         /* Don't allow bond devices to change network namespaces. */
3904         bond_dev->features |= NETIF_F_NETNS_LOCAL;
3905
3906         bond_dev->hw_features = BOND_VLAN_FEATURES |
3907                                 NETIF_F_HW_VLAN_CTAG_TX |
3908                                 NETIF_F_HW_VLAN_CTAG_RX |
3909                                 NETIF_F_HW_VLAN_CTAG_FILTER;
3910
3911         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
3912         bond_dev->features |= bond_dev->hw_features;
3913 }
3914
3915 /*
3916 * Destroy a bonding device.
3917 * Must be under rtnl_lock when this function is called.
3918 */
3919 static void bond_uninit(struct net_device *bond_dev)
3920 {
3921         struct bonding *bond = netdev_priv(bond_dev);
3922         struct list_head *iter;
3923         struct slave *slave;
3924
3925         bond_netpoll_cleanup(bond_dev);
3926
3927         /* Release the bonded slaves */
3928         bond_for_each_slave(bond, slave, iter)
3929                 __bond_release_one(bond_dev, slave->dev, true);
3930         pr_info("%s: released all slaves\n", bond_dev->name);
3931
3932         list_del(&bond->bond_list);
3933
3934         bond_debug_unregister(bond);
3935 }
3936
3937 /*------------------------- Module initialization ---------------------------*/
3938
3939 int bond_parm_tbl_lookup(int mode, const struct bond_parm_tbl *tbl)
3940 {
3941         int i;
3942
3943         for (i = 0; tbl[i].modename; i++)
3944                 if (mode == tbl[i].mode)
3945                         return tbl[i].mode;
3946
3947         return -1;
3948 }
3949
3950 static int bond_parm_tbl_lookup_name(const char *modename,
3951                                      const struct bond_parm_tbl *tbl)
3952 {
3953         int i;
3954
3955         for (i = 0; tbl[i].modename; i++)
3956                 if (strcmp(modename, tbl[i].modename) == 0)
3957                         return tbl[i].mode;
3958
3959         return -1;
3960 }
3961
3962 /*
3963  * Convert string input module parms.  Accept either the
3964  * number of the mode or its string name.  A bit complicated because
3965  * some mode names are substrings of other names, and calls from sysfs
3966  * may have whitespace in the name (trailing newlines, for example).
3967  */
3968 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
3969 {
3970         int modeint;
3971         char *p, modestr[BOND_MAX_MODENAME_LEN + 1];
3972
3973         for (p = (char *)buf; *p; p++)
3974                 if (!(isdigit(*p) || isspace(*p)))
3975                         break;
3976
3977         if (*p && sscanf(buf, "%20s", modestr) != 0)
3978                 return bond_parm_tbl_lookup_name(modestr, tbl);
3979         else if (sscanf(buf, "%d", &modeint) != 0)
3980                 return bond_parm_tbl_lookup(modeint, tbl);
3981
3982         return -1;
3983 }
3984
3985 static int bond_check_params(struct bond_params *params)
3986 {
3987         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
3988         struct bond_opt_value newval, *valptr;
3989         int arp_all_targets_value;
3990
3991         /*
3992          * Convert string parameters.
3993          */
3994         if (mode) {
3995                 bond_opt_initstr(&newval, mode);
3996                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
3997                 if (!valptr) {
3998                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
3999                         return -EINVAL;
4000                 }
4001                 bond_mode = valptr->value;
4002         }
4003
4004         if (xmit_hash_policy) {
4005                 if ((bond_mode != BOND_MODE_XOR) &&
4006                     (bond_mode != BOND_MODE_8023AD)) {
4007                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4008                                bond_mode_name(bond_mode));
4009                 } else {
4010                         bond_opt_initstr(&newval, xmit_hash_policy);
4011                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4012                                                 &newval);
4013                         if (!valptr) {
4014                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4015                                        xmit_hash_policy);
4016                                 return -EINVAL;
4017                         }
4018                         xmit_hashtype = valptr->value;
4019                 }
4020         }
4021
4022         if (lacp_rate) {
4023                 if (bond_mode != BOND_MODE_8023AD) {
4024                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4025                                 bond_mode_name(bond_mode));
4026                 } else {
4027                         bond_opt_initstr(&newval, lacp_rate);
4028                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4029                                                 &newval);
4030                         if (!valptr) {
4031                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4032                                        lacp_rate);
4033                                 return -EINVAL;
4034                         }
4035                         lacp_fast = valptr->value;
4036                 }
4037         }
4038
4039         if (ad_select) {
4040                 bond_opt_initstr(&newval, lacp_rate);
4041                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4042                                         &newval);
4043                 if (!valptr) {
4044                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4045                         return -EINVAL;
4046                 }
4047                 params->ad_select = valptr->value;
4048                 if (bond_mode != BOND_MODE_8023AD)
4049                         pr_warning("ad_select param only affects 802.3ad mode\n");
4050         } else {
4051                 params->ad_select = BOND_AD_STABLE;
4052         }
4053
4054         if (max_bonds < 0) {
4055                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4056                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4057                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4058         }
4059
4060         if (miimon < 0) {
4061                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4062                            miimon, INT_MAX);
4063                 miimon = 0;
4064         }
4065
4066         if (updelay < 0) {
4067                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4068                            updelay, INT_MAX);
4069                 updelay = 0;
4070         }
4071
4072         if (downdelay < 0) {
4073                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4074                            downdelay, INT_MAX);
4075                 downdelay = 0;
4076         }
4077
4078         if ((use_carrier != 0) && (use_carrier != 1)) {
4079                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4080                            use_carrier);
4081                 use_carrier = 1;
4082         }
4083
4084         if (num_peer_notif < 0 || num_peer_notif > 255) {
4085                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4086                            num_peer_notif);
4087                 num_peer_notif = 1;
4088         }
4089
4090         /* reset values for 802.3ad/TLB/ALB */
4091         if (BOND_NO_USES_ARP(bond_mode)) {
4092                 if (!miimon) {
4093                         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");
4094                         pr_warning("Forcing miimon to 100msec\n");
4095                         miimon = BOND_DEFAULT_MIIMON;
4096                 }
4097         }
4098
4099         if (tx_queues < 1 || tx_queues > 255) {
4100                 pr_warning("Warning: tx_queues (%d) should be between "
4101                            "1 and 255, resetting to %d\n",
4102                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4103                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4104         }
4105
4106         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4107                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4108                            "not of valid value (0/1), so it was set to "
4109                            "0\n", all_slaves_active);
4110                 all_slaves_active = 0;
4111         }
4112
4113         if (resend_igmp < 0 || resend_igmp > 255) {
4114                 pr_warning("Warning: resend_igmp (%d) should be between "
4115                            "0 and 255, resetting to %d\n",
4116                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4117                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4118         }
4119
4120         bond_opt_initval(&newval, packets_per_slave);
4121         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4122                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4123                         packets_per_slave, USHRT_MAX);
4124                 packets_per_slave = 1;
4125         }
4126
4127         if (bond_mode == BOND_MODE_ALB) {
4128                 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",
4129                           updelay);
4130         }
4131
4132         if (!miimon) {
4133                 if (updelay || downdelay) {
4134                         /* just warn the user the up/down delay will have
4135                          * no effect since miimon is zero...
4136                          */
4137                         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",
4138                                    updelay, downdelay);
4139                 }
4140         } else {
4141                 /* don't allow arp monitoring */
4142                 if (arp_interval) {
4143                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4144                                    miimon, arp_interval);
4145                         arp_interval = 0;
4146                 }
4147
4148                 if ((updelay % miimon) != 0) {
4149                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4150                                    updelay, miimon,
4151                                    (updelay / miimon) * miimon);
4152                 }
4153
4154                 updelay /= miimon;
4155
4156                 if ((downdelay % miimon) != 0) {
4157                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4158                                    downdelay, miimon,
4159                                    (downdelay / miimon) * miimon);
4160                 }
4161
4162                 downdelay /= miimon;
4163         }
4164
4165         if (arp_interval < 0) {
4166                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to 0\n",
4167                            arp_interval, INT_MAX);
4168                 arp_interval = 0;
4169         }
4170
4171         for (arp_ip_count = 0, i = 0;
4172              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4173                 /* not complete check, but should be good enough to
4174                    catch mistakes */
4175                 __be32 ip;
4176                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4177                     IS_IP_TARGET_UNUSABLE_ADDRESS(ip)) {
4178                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4179                                    arp_ip_target[i]);
4180                         arp_interval = 0;
4181                 } else {
4182                         if (bond_get_targets_ip(arp_target, ip) == -1)
4183                                 arp_target[arp_ip_count++] = ip;
4184                         else
4185                                 pr_warning("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4186                                            &ip);
4187                 }
4188         }
4189
4190         if (arp_interval && !arp_ip_count) {
4191                 /* don't allow arping if no arp_ip_target given... */
4192                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4193                            arp_interval);
4194                 arp_interval = 0;
4195         }
4196
4197         if (arp_validate) {
4198                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4199                         pr_err("arp_validate only supported in active-backup mode\n");
4200                         return -EINVAL;
4201                 }
4202                 if (!arp_interval) {
4203                         pr_err("arp_validate requires arp_interval\n");
4204                         return -EINVAL;
4205                 }
4206
4207                 bond_opt_initstr(&newval, arp_validate);
4208                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4209                                         &newval);
4210                 if (!valptr) {
4211                         pr_err("Error: invalid arp_validate \"%s\"\n",
4212                                arp_validate);
4213                         return -EINVAL;
4214                 }
4215                 arp_validate_value = valptr->value;
4216         } else {
4217                 arp_validate_value = 0;
4218         }
4219
4220         arp_all_targets_value = 0;
4221         if (arp_all_targets) {
4222                 bond_opt_initstr(&newval, arp_all_targets);
4223                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4224                                         &newval);
4225                 if (!valptr) {
4226                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4227                                arp_all_targets);
4228                         arp_all_targets_value = 0;
4229                 } else {
4230                         arp_all_targets_value = valptr->value;
4231                 }
4232         }
4233
4234         if (miimon) {
4235                 pr_info("MII link monitoring set to %d ms\n", miimon);
4236         } else if (arp_interval) {
4237                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4238                                           arp_validate_value);
4239                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4240                         arp_interval, valptr->string, arp_ip_count);
4241
4242                 for (i = 0; i < arp_ip_count; i++)
4243                         pr_info(" %s", arp_ip_target[i]);
4244
4245                 pr_info("\n");
4246
4247         } else if (max_bonds) {
4248                 /* miimon and arp_interval not set, we need one so things
4249                  * work as expected, see bonding.txt for details
4250                  */
4251                 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");
4252         }
4253
4254         if (primary && !USES_PRIMARY(bond_mode)) {
4255                 /* currently, using a primary only makes sense
4256                  * in active backup, TLB or ALB modes
4257                  */
4258                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4259                            primary, bond_mode_name(bond_mode));
4260                 primary = NULL;
4261         }
4262
4263         if (primary && primary_reselect) {
4264                 bond_opt_initstr(&newval, primary_reselect);
4265                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4266                                         &newval);
4267                 if (!valptr) {
4268                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4269                                primary_reselect);
4270                         return -EINVAL;
4271                 }
4272                 primary_reselect_value = valptr->value;
4273         } else {
4274                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4275         }
4276
4277         if (fail_over_mac) {
4278                 bond_opt_initstr(&newval, fail_over_mac);
4279                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4280                                         &newval);
4281                 if (!valptr) {
4282                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4283                                fail_over_mac);
4284                         return -EINVAL;
4285                 }
4286                 fail_over_mac_value = valptr->value;
4287                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4288                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4289         } else {
4290                 fail_over_mac_value = BOND_FOM_NONE;
4291         }
4292
4293         if (lp_interval == 0) {
4294                 pr_warning("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4295                            INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4296                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4297         }
4298
4299         /* fill params struct with the proper values */
4300         params->mode = bond_mode;
4301         params->xmit_policy = xmit_hashtype;
4302         params->miimon = miimon;
4303         params->num_peer_notif = num_peer_notif;
4304         params->arp_interval = arp_interval;
4305         params->arp_validate = arp_validate_value;
4306         params->arp_all_targets = arp_all_targets_value;
4307         params->updelay = updelay;
4308         params->downdelay = downdelay;
4309         params->use_carrier = use_carrier;
4310         params->lacp_fast = lacp_fast;
4311         params->primary[0] = 0;
4312         params->primary_reselect = primary_reselect_value;
4313         params->fail_over_mac = fail_over_mac_value;
4314         params->tx_queues = tx_queues;
4315         params->all_slaves_active = all_slaves_active;
4316         params->resend_igmp = resend_igmp;
4317         params->min_links = min_links;
4318         params->lp_interval = lp_interval;
4319         params->packets_per_slave = packets_per_slave;
4320         if (packets_per_slave > 0) {
4321                 params->reciprocal_packets_per_slave =
4322                         reciprocal_value(packets_per_slave);
4323         } else {
4324                 /* reciprocal_packets_per_slave is unused if
4325                  * packets_per_slave is 0 or 1, just initialize it
4326                  */
4327                 params->reciprocal_packets_per_slave =
4328                         (struct reciprocal_value) { 0 };
4329         }
4330
4331         if (primary) {
4332                 strncpy(params->primary, primary, IFNAMSIZ);
4333                 params->primary[IFNAMSIZ - 1] = 0;
4334         }
4335
4336         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4337
4338         return 0;
4339 }
4340
4341 static struct lock_class_key bonding_netdev_xmit_lock_key;
4342 static struct lock_class_key bonding_netdev_addr_lock_key;
4343 static struct lock_class_key bonding_tx_busylock_key;
4344
4345 static void bond_set_lockdep_class_one(struct net_device *dev,
4346                                        struct netdev_queue *txq,
4347                                        void *_unused)
4348 {
4349         lockdep_set_class(&txq->_xmit_lock,
4350                           &bonding_netdev_xmit_lock_key);
4351 }
4352
4353 static void bond_set_lockdep_class(struct net_device *dev)
4354 {
4355         lockdep_set_class(&dev->addr_list_lock,
4356                           &bonding_netdev_addr_lock_key);
4357         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4358         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4359 }
4360
4361 /*
4362  * Called from registration process
4363  */
4364 static int bond_init(struct net_device *bond_dev)
4365 {
4366         struct bonding *bond = netdev_priv(bond_dev);
4367         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4368         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4369
4370         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4371
4372         /*
4373          * Initialize locks that may be required during
4374          * en/deslave operations.  All of the bond_open work
4375          * (of which this is part) should really be moved to
4376          * a phase prior to dev_open
4377          */
4378         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4379         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4380
4381         bond->wq = create_singlethread_workqueue(bond_dev->name);
4382         if (!bond->wq)
4383                 return -ENOMEM;
4384
4385         bond_set_lockdep_class(bond_dev);
4386
4387         list_add_tail(&bond->bond_list, &bn->dev_list);
4388
4389         bond_prepare_sysfs_group(bond);
4390
4391         bond_debug_register(bond);
4392
4393         /* Ensure valid dev_addr */
4394         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4395             bond_dev->addr_assign_type == NET_ADDR_PERM)
4396                 eth_hw_addr_random(bond_dev);
4397
4398         return 0;
4399 }
4400
4401 unsigned int bond_get_num_tx_queues(void)
4402 {
4403         return tx_queues;
4404 }
4405
4406 /* Create a new bond based on the specified name and bonding parameters.
4407  * If name is NULL, obtain a suitable "bond%d" name for us.
4408  * Caller must NOT hold rtnl_lock; we need to release it here before we
4409  * set up our sysfs entries.
4410  */
4411 int bond_create(struct net *net, const char *name)
4412 {
4413         struct net_device *bond_dev;
4414         int res;
4415
4416         rtnl_lock();
4417
4418         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4419                                    name ? name : "bond%d",
4420                                    bond_setup, tx_queues);
4421         if (!bond_dev) {
4422                 pr_err("%s: eek! can't alloc netdev!\n", name);
4423                 rtnl_unlock();
4424                 return -ENOMEM;
4425         }
4426
4427         dev_net_set(bond_dev, net);
4428         bond_dev->rtnl_link_ops = &bond_link_ops;
4429
4430         res = register_netdevice(bond_dev);
4431
4432         netif_carrier_off(bond_dev);
4433
4434         rtnl_unlock();
4435         if (res < 0)
4436                 bond_destructor(bond_dev);
4437         return res;
4438 }
4439
4440 static int __net_init bond_net_init(struct net *net)
4441 {
4442         struct bond_net *bn = net_generic(net, bond_net_id);
4443
4444         bn->net = net;
4445         INIT_LIST_HEAD(&bn->dev_list);
4446
4447         bond_create_proc_dir(bn);
4448         bond_create_sysfs(bn);
4449
4450         return 0;
4451 }
4452
4453 static void __net_exit bond_net_exit(struct net *net)
4454 {
4455         struct bond_net *bn = net_generic(net, bond_net_id);
4456         struct bonding *bond, *tmp_bond;
4457         LIST_HEAD(list);
4458
4459         bond_destroy_sysfs(bn);
4460         bond_destroy_proc_dir(bn);
4461
4462         /* Kill off any bonds created after unregistering bond rtnl ops */
4463         rtnl_lock();
4464         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4465                 unregister_netdevice_queue(bond->dev, &list);
4466         unregister_netdevice_many(&list);
4467         rtnl_unlock();
4468 }
4469
4470 static struct pernet_operations bond_net_ops = {
4471         .init = bond_net_init,
4472         .exit = bond_net_exit,
4473         .id   = &bond_net_id,
4474         .size = sizeof(struct bond_net),
4475 };
4476
4477 static int __init bonding_init(void)
4478 {
4479         int i;
4480         int res;
4481
4482         pr_info("%s", bond_version);
4483
4484         res = bond_check_params(&bonding_defaults);
4485         if (res)
4486                 goto out;
4487
4488         res = register_pernet_subsys(&bond_net_ops);
4489         if (res)
4490                 goto out;
4491
4492         res = bond_netlink_init();
4493         if (res)
4494                 goto err_link;
4495
4496         bond_create_debugfs();
4497
4498         for (i = 0; i < max_bonds; i++) {
4499                 res = bond_create(&init_net, NULL);
4500                 if (res)
4501                         goto err;
4502         }
4503
4504         register_netdevice_notifier(&bond_netdev_notifier);
4505 out:
4506         return res;
4507 err:
4508         bond_netlink_fini();
4509 err_link:
4510         unregister_pernet_subsys(&bond_net_ops);
4511         goto out;
4512
4513 }
4514
4515 static void __exit bonding_exit(void)
4516 {
4517         unregister_netdevice_notifier(&bond_netdev_notifier);
4518
4519         bond_destroy_debugfs();
4520
4521         bond_netlink_fini();
4522         unregister_pernet_subsys(&bond_net_ops);
4523
4524 #ifdef CONFIG_NET_POLL_CONTROLLER
4525         /*
4526          * Make sure we don't have an imbalance on our netpoll blocking
4527          */
4528         WARN_ON(atomic_read(&netpoll_block_tx));
4529 #endif
4530 }
4531
4532 module_init(bonding_init);
4533 module_exit(bonding_exit);
4534 MODULE_LICENSE("GPL");
4535 MODULE_VERSION(DRV_VERSION);
4536 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4537 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");