drivers/net/bonding/bond_main.c

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/fcntl.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/ptrace.h>
  42 #include <linux/ioport.h>
  43 #include <linux/in.h>
  44 #include <net/ip.h>
  45 #include <linux/ip.h>
  46 #include <linux/tcp.h>
  47 #include <linux/udp.h>
  48 #include <linux/slab.h>
  49 #include <linux/string.h>
  50 #include <linux/init.h>
  51 #include <linux/timer.h>
  52 #include <linux/socket.h>
  53 #include <linux/ctype.h>
  54 #include <linux/inet.h>
  55 #include <linux/bitops.h>
  56 #include <linux/io.h>
  57 #include <asm/dma.h>
  58 #include <linux/uaccess.h>
  59 #include <linux/errno.h>
  60 #include <linux/netdevice.h>
  61 #include <linux/inetdevice.h>
  62 #include <linux/igmp.h>
  63 #include <linux/etherdevice.h>
  64 #include <linux/skbuff.h>
  65 #include <net/sock.h>
  66 #include <linux/rtnetlink.h>
  67 #include <linux/smp.h>
  68 #include <linux/if_ether.h>
  69 #include <net/arp.h>
  70 #include <linux/mii.h>
  71 #include <linux/ethtool.h>
  72 #include <linux/if_vlan.h>
  73 #include <linux/if_bonding.h>
  74 #include <linux/jiffies.h>
  75 #include <linux/preempt.h>
  76 #include <net/route.h>
  77 #include <net/net_namespace.h>
  78 #include <net/netns/generic.h>
  79 #include <net/pkt_sched.h>
  80 #include <linux/rculist.h>
  81 #include "bonding.h"
  82 #include "bond_3ad.h"
  83 #include "bond_alb.h"
  84
  85 /*---------------------------- Module parameters ----------------------------*/
  86
  87 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  88 #define BOND_LINK_MON_INTERV    0
  89 #define BOND_LINK_ARP_INTERV    0
  90
  91 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  92 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  93 static int num_peer_notif = 1;
  94 static int miimon       = BOND_LINK_MON_INTERV;
  95 static int updelay;
  96 static int downdelay;
  97 static int use_carrier  = 1;
  98 static char *mode;
  99 static char *primary;
 100 static char *primary_reselect;
 101 static char *lacp_rate;
 102 static int min_links;
 103 static char *ad_select;
 104 static char *xmit_hash_policy;
 105 static int arp_interval = BOND_LINK_ARP_INTERV;
 106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 107 static char *arp_validate;
 108 static char *arp_all_targets;
 109 static char *fail_over_mac;
 110 static int all_slaves_active;
 111 static struct bond_params bonding_defaults;
 112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 113
 114 module_param(max_bonds, int, 0);
 115 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 116 module_param(tx_queues, int, 0);
 117 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 118 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 119 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 120                                "failover event (alias of num_unsol_na)");
 121 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 122 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 123                                "failover event (alias of num_grat_arp)");
 124 module_param(miimon, int, 0);
 125 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 126 module_param(updelay, int, 0);
 127 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 128 module_param(downdelay, int, 0);
 129 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 130                             "in milliseconds");
 131 module_param(use_carrier, int, 0);
 132 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 133                               "0 for off, 1 for on (default)");
 134 module_param(mode, charp, 0);
 135 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 136                        "1 for active-backup, 2 for balance-xor, "
 137                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 138                        "6 for balance-alb");
 139 module_param(primary, charp, 0);
 140 MODULE_PARM_DESC(primary, "Primary network device to use");
 141 module_param(primary_reselect, charp, 0);
 142 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 143                                    "once it comes up; "
 144                                    "0 for always (default), "
 145                                    "1 for only if speed of primary is "
 146                                    "better, "
 147                                    "2 for only on active slave "
 148                                    "failure");
 149 module_param(lacp_rate, charp, 0);
 150 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 151                             "0 for slow, 1 for fast");
 152 module_param(ad_select, charp, 0);
 153 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
 154                             "0 for stable (default), 1 for bandwidth, "
 155                             "2 for count");
 156 module_param(min_links, int, 0);
 157 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 158
 159 module_param(xmit_hash_policy, charp, 0);
 160 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 161                                    "0 for layer 2 (default), 1 for layer 3+4, "
 162                                    "2 for layer 2+3");
 163 module_param(arp_interval, int, 0);
 164 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 165 module_param_array(arp_ip_target, charp, NULL, 0);
 166 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 167 module_param(arp_validate, charp, 0);
 168 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 169                                "0 for none (default), 1 for active, "
 170                                "2 for backup, 3 for all");
 171 module_param(arp_all_targets, charp, 0);
 172 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 173 module_param(fail_over_mac, charp, 0);
 174 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 175                                 "the same MAC; 0 for none (default), "
 176                                 "1 for active, 2 for follow");
 177 module_param(all_slaves_active, int, 0);
 178 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 179                                      "by setting active flag for all slaves; "
 180                                      "0 for never (default), 1 for always.");
 181 module_param(resend_igmp, int, 0);
 182 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 183                               "link failure");
 184
 185 /*----------------------------- Global variables ----------------------------*/
 186
 187 #ifdef CONFIG_NET_POLL_CONTROLLER
 188 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 189 #endif
 190
 191 int bond_net_id __read_mostly;
 192
 193 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 194 static int arp_ip_count;
 195 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 196 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 197 static int lacp_fast;
 198
 199 const struct bond_parm_tbl bond_lacp_tbl[] = {
 200 {       "slow",         AD_LACP_SLOW},
 201 {       "fast",         AD_LACP_FAST},
 202 {       NULL,           -1},
 203 };
 204
 205 const struct bond_parm_tbl bond_mode_tbl[] = {
 206 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 207 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 208 {       "balance-xor",          BOND_MODE_XOR},
 209 {       "broadcast",            BOND_MODE_BROADCAST},
 210 {       "802.3ad",              BOND_MODE_8023AD},
 211 {       "balance-tlb",          BOND_MODE_TLB},
 212 {       "balance-alb",          BOND_MODE_ALB},
 213 {       NULL,                   -1},
 214 };
 215
 216 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 217 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 218 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 219 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 220 {       NULL,                   -1},
 221 };
 222
 223 const struct bond_parm_tbl arp_all_targets_tbl[] = {
 224 {       "any",                  BOND_ARP_TARGETS_ANY},
 225 {       "all",                  BOND_ARP_TARGETS_ALL},
 226 {       NULL,                   -1},
 227 };
 228
 229 const struct bond_parm_tbl arp_validate_tbl[] = {
 230 {       "none",                 BOND_ARP_VALIDATE_NONE},
 231 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 232 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 233 {       "all",                  BOND_ARP_VALIDATE_ALL},
 234 {       NULL,                   -1},
 235 };
 236
 237 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 238 {       "none",                 BOND_FOM_NONE},
 239 {       "active",               BOND_FOM_ACTIVE},
 240 {       "follow",               BOND_FOM_FOLLOW},
 241 {       NULL,                   -1},
 242 };
 243
 244 const struct bond_parm_tbl pri_reselect_tbl[] = {
 245 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 246 {       "better",               BOND_PRI_RESELECT_BETTER},
 247 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 248 {       NULL,                   -1},
 249 };
 250
 251 struct bond_parm_tbl ad_select_tbl[] = {
 252 {       "stable",       BOND_AD_STABLE},
 253 {       "bandwidth",    BOND_AD_BANDWIDTH},
 254 {       "count",        BOND_AD_COUNT},
 255 {       NULL,           -1},
 256 };
 257
 258 /*-------------------------- Forward declarations ---------------------------*/
 259
 260 static int bond_init(struct net_device *bond_dev);
 261 static void bond_uninit(struct net_device *bond_dev);
 262
 263 /*---------------------------- General routines -----------------------------*/
 264
 265 const char *bond_mode_name(int mode)
 266 {
 267         static const char *names[] = {
 268                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 269                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 270                 [BOND_MODE_XOR] = "load balancing (xor)",
 271                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 272                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 273                 [BOND_MODE_TLB] = "transmit load balancing",
 274                 [BOND_MODE_ALB] = "adaptive load balancing",
 275         };
 276
 277         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 278                 return "unknown";
 279
 280         return names[mode];
 281 }
 282
 283 /*---------------------------------- VLAN -----------------------------------*/
 284
 285 /**
 286  * bond_dev_queue_xmit - Prepare skb for xmit.
 287  *
 288  * @bond: bond device that got this skb for tx.
 289  * @skb: hw accel VLAN tagged skb to transmit
 290  * @slave_dev: slave that is supposed to xmit this skbuff
 291  */
 292 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 293                         struct net_device *slave_dev)
 294 {
 295         skb->dev = slave_dev;
 296
 297         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 298                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 299         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
 300
 301         if (unlikely(netpoll_tx_running(bond->dev)))
 302                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 303         else
 304                 dev_queue_xmit(skb);
 305
 306         return 0;
 307 }
 308
 309 /*
 310  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 311  * We don't protect the slave list iteration with a lock because:
 312  * a. This operation is performed in IOCTL context,
 313  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 314  * c. Holding a lock with BH disabled while directly calling a base driver
 315  *    entry point is generally a BAD idea.
 316  *
 317  * The design of synchronization/protection for this operation in the 8021q
 318  * module is good for one or more VLAN devices over a single physical device
 319  * and cannot be extended for a teaming solution like bonding, so there is a
 320  * potential race condition here where a net device from the vlan group might
 321  * be referenced (either by a base driver or the 8021q code) while it is being
 322  * removed from the system. However, it turns out we're not making matters
 323  * worse, and if it works for regular VLAN usage it will work here too.
 324 */
 325
 326 /**
 327  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 328  * @bond_dev: bonding net device that got called
 329  * @vid: vlan id being added
 330  */
 331 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 332                                 __be16 proto, u16 vid)
 333 {
 334         struct bonding *bond = netdev_priv(bond_dev);
 335         struct slave *slave;
 336         int res;
 337
 338         bond_for_each_slave(bond, slave) {
 339                 res = vlan_vid_add(slave->dev, proto, vid);
 340                 if (res)
 341                         goto unwind;
 342         }
 343
 344         return 0;
 345
 346 unwind:
 347         /* unwind from the slave that failed */
 348         bond_for_each_slave_continue_reverse(bond, slave)
 349                 vlan_vid_del(slave->dev, proto, vid);
 350
 351         return res;
 352 }
 353
 354 /**
 355  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 356  * @bond_dev: bonding net device that got called
 357  * @vid: vlan id being removed
 358  */
 359 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 360                                  __be16 proto, u16 vid)
 361 {
 362         struct bonding *bond = netdev_priv(bond_dev);
 363         struct slave *slave;
 364
 365         bond_for_each_slave(bond, slave)
 366                 vlan_vid_del(slave->dev, proto, vid);
 367
 368         if (bond_is_lb(bond))
 369                 bond_alb_clear_vlan(bond, vid);
 370
 371         return 0;
 372 }
 373
 374 /*------------------------------- Link status -------------------------------*/
 375
 376 /*
 377  * Set the carrier state for the master according to the state of its
 378  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 379  * do special 802.3ad magic.
 380  *
 381  * Returns zero if carrier state does not change, nonzero if it does.
 382  */
 383 static int bond_set_carrier(struct bonding *bond)
 384 {
 385         struct slave *slave;
 386
 387         if (list_empty(&bond->slave_list))
 388                 goto down;
 389
 390         if (bond->params.mode == BOND_MODE_8023AD)
 391                 return bond_3ad_set_carrier(bond);
 392
 393         bond_for_each_slave(bond, slave) {
 394                 if (slave->link == BOND_LINK_UP) {
 395                         if (!netif_carrier_ok(bond->dev)) {
 396                                 netif_carrier_on(bond->dev);
 397                                 return 1;
 398                         }
 399                         return 0;
 400                 }
 401         }
 402
 403 down:
 404         if (netif_carrier_ok(bond->dev)) {
 405                 netif_carrier_off(bond->dev);
 406                 return 1;
 407         }
 408         return 0;
 409 }
 410
 411 /*
 412  * Get link speed and duplex from the slave's base driver
 413  * using ethtool. If for some reason the call fails or the
 414  * values are invalid, set speed and duplex to -1,
 415  * and return.
 416  */
 417 static void bond_update_speed_duplex(struct slave *slave)
 418 {
 419         struct net_device *slave_dev = slave->dev;
 420         struct ethtool_cmd ecmd;
 421         u32 slave_speed;
 422         int res;
 423
 424         slave->speed = SPEED_UNKNOWN;
 425         slave->duplex = DUPLEX_UNKNOWN;
 426
 427         res = __ethtool_get_settings(slave_dev, &ecmd);
 428         if (res < 0)
 429                 return;
 430
 431         slave_speed = ethtool_cmd_speed(&ecmd);
 432         if (slave_speed == 0 || slave_speed == ((__u32) -1))
 433                 return;
 434
 435         switch (ecmd.duplex) {
 436         case DUPLEX_FULL:
 437         case DUPLEX_HALF:
 438                 break;
 439         default:
 440                 return;
 441         }
 442
 443         slave->speed = slave_speed;
 444         slave->duplex = ecmd.duplex;
 445
 446         return;
 447 }
 448
 449 /*
 450  * if <dev> supports MII link status reporting, check its link status.
 451  *
 452  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 453  * depending upon the setting of the use_carrier parameter.
 454  *
 455  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 456  * can't tell and just pretend it is), or 0, meaning that the link is
 457  * down.
 458  *
 459  * If reporting is non-zero, instead of faking link up, return -1 if
 460  * both ETHTOOL and MII ioctls fail (meaning the device does not
 461  * support them).  If use_carrier is set, return whatever it says.
 462  * It'd be nice if there was a good way to tell if a driver supports
 463  * netif_carrier, but there really isn't.
 464  */
 465 static int bond_check_dev_link(struct bonding *bond,
 466                                struct net_device *slave_dev, int reporting)
 467 {
 468         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 469         int (*ioctl)(struct net_device *, struct ifreq *, int);
 470         struct ifreq ifr;
 471         struct mii_ioctl_data *mii;
 472
 473         if (!reporting && !netif_running(slave_dev))
 474                 return 0;
 475
 476         if (bond->params.use_carrier)
 477                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 478
 479         /* Try to get link status using Ethtool first. */
 480         if (slave_dev->ethtool_ops->get_link)
 481                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 482                         BMSR_LSTATUS : 0;
 483
 484         /* Ethtool can't be used, fallback to MII ioctls. */
 485         ioctl = slave_ops->ndo_do_ioctl;
 486         if (ioctl) {
 487                 /* TODO: set pointer to correct ioctl on a per team member */
 488                 /*       bases to make this more efficient. that is, once  */
 489                 /*       we determine the correct ioctl, we will always    */
 490                 /*       call it and not the others for that team          */
 491                 /*       member.                                           */
 492
 493                 /*
 494                  * We cannot assume that SIOCGMIIPHY will also read a
 495                  * register; not all network drivers (e.g., e100)
 496                  * support that.
 497                  */
 498
 499                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 500                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 501                 mii = if_mii(&ifr);
 502                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 503                         mii->reg_num = MII_BMSR;
 504                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 505                                 return mii->val_out & BMSR_LSTATUS;
 506                 }
 507         }
 508
 509         /*
 510          * If reporting, report that either there's no dev->do_ioctl,
 511          * or both SIOCGMIIREG and get_link failed (meaning that we
 512          * cannot report link status).  If not reporting, pretend
 513          * we're ok.
 514          */
 515         return reporting ? -1 : BMSR_LSTATUS;
 516 }
 517
 518 /*----------------------------- Multicast list ------------------------------*/
 519
 520 /*
 521  * Push the promiscuity flag down to appropriate slaves
 522  */
 523 static int bond_set_promiscuity(struct bonding *bond, int inc)
 524 {
 525         int err = 0;
 526         if (USES_PRIMARY(bond->params.mode)) {
 527                 /* write lock already acquired */
 528                 if (bond->curr_active_slave) {
 529                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 530                                                   inc);
 531                 }
 532         } else {
 533                 struct slave *slave;
 534
 535                 bond_for_each_slave(bond, slave) {
 536                         err = dev_set_promiscuity(slave->dev, inc);
 537                         if (err)
 538                                 return err;
 539                 }
 540         }
 541         return err;
 542 }
 543
 544 /*
 545  * Push the allmulti flag down to all slaves
 546  */
 547 static int bond_set_allmulti(struct bonding *bond, int inc)
 548 {
 549         int err = 0;
 550         if (USES_PRIMARY(bond->params.mode)) {
 551                 /* write lock already acquired */
 552                 if (bond->curr_active_slave) {
 553                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 554                                                inc);
 555                 }
 556         } else {
 557                 struct slave *slave;
 558
 559                 bond_for_each_slave(bond, slave) {
 560                         err = dev_set_allmulti(slave->dev, inc);
 561                         if (err)
 562                                 return err;
 563                 }
 564         }
 565         return err;
 566 }
 567
 568 /*
 569  * Retrieve the list of registered multicast addresses for the bonding
 570  * device and retransmit an IGMP JOIN request to the current active
 571  * slave.
 572  */
 573 static void bond_resend_igmp_join_requests(struct bonding *bond)
 574 {
 575         if (!rtnl_trylock()) {
 576                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 577                 return;
 578         }
 579         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 580         rtnl_unlock();
 581
 582         /* We use curr_slave_lock to protect against concurrent access to
 583          * igmp_retrans from multiple running instances of this function and
 584          * bond_change_active_slave
 585          */
 586         write_lock_bh(&bond->curr_slave_lock);
 587         if (bond->igmp_retrans > 1) {
 588                 bond->igmp_retrans--;
 589                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 590         }
 591         write_unlock_bh(&bond->curr_slave_lock);
 592 }
 593
 594 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 595 {
 596         struct bonding *bond = container_of(work, struct bonding,
 597                                             mcast_work.work);
 598
 599         bond_resend_igmp_join_requests(bond);
 600 }
 601
 602 /* Flush bond's hardware addresses from slave
 603  */
 604 static void bond_hw_addr_flush(struct net_device *bond_dev,
 605                                struct net_device *slave_dev)
 606 {
 607         struct bonding *bond = netdev_priv(bond_dev);
 608
 609         dev_uc_unsync(slave_dev, bond_dev);
 610         dev_mc_unsync(slave_dev, bond_dev);
 611
 612         if (bond->params.mode == BOND_MODE_8023AD) {
 613                 /* del lacpdu mc addr from mc list */
 614                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 615
 616                 dev_mc_del(slave_dev, lacpdu_multicast);
 617         }
 618 }
 619
 620 /*--------------------------- Active slave change ---------------------------*/
 621
 622 /* Update the hardware address list and promisc/allmulti for the new and
 623  * old active slaves (if any).  Modes that are !USES_PRIMARY keep all
 624  * slaves up date at all times; only the USES_PRIMARY modes need to call
 625  * this function to swap these settings during a failover.
 626  */
 627 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 628                               struct slave *old_active)
 629 {
 630         ASSERT_RTNL();
 631
 632         if (old_active) {
 633                 if (bond->dev->flags & IFF_PROMISC)
 634                         dev_set_promiscuity(old_active->dev, -1);
 635
 636                 if (bond->dev->flags & IFF_ALLMULTI)
 637                         dev_set_allmulti(old_active->dev, -1);
 638
 639                 bond_hw_addr_flush(bond->dev, old_active->dev);
 640         }
 641
 642         if (new_active) {
 643                 /* FIXME: Signal errors upstream. */
 644                 if (bond->dev->flags & IFF_PROMISC)
 645                         dev_set_promiscuity(new_active->dev, 1);
 646
 647                 if (bond->dev->flags & IFF_ALLMULTI)
 648                         dev_set_allmulti(new_active->dev, 1);
 649
 650                 netif_addr_lock_bh(bond->dev);
 651                 dev_uc_sync(new_active->dev, bond->dev);
 652                 dev_mc_sync(new_active->dev, bond->dev);
 653                 netif_addr_unlock_bh(bond->dev);
 654         }
 655 }
 656
 657 /**
 658  * bond_set_dev_addr - clone slave's address to bond
 659  * @bond_dev: bond net device
 660  * @slave_dev: slave net device
 661  *
 662  * Should be called with RTNL held.
 663  */
 664 static void bond_set_dev_addr(struct net_device *bond_dev,
 665                               struct net_device *slave_dev)
 666 {
 667         pr_debug("bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 668                  bond_dev, slave_dev, slave_dev->addr_len);
 669         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 670         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 671         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 672 }
 673
 674 /*
 675  * bond_do_fail_over_mac
 676  *
 677  * Perform special MAC address swapping for fail_over_mac settings
 678  *
 679  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 680  */
 681 static void bond_do_fail_over_mac(struct bonding *bond,
 682                                   struct slave *new_active,
 683                                   struct slave *old_active)
 684         __releases(&bond->curr_slave_lock)
 685         __releases(&bond->lock)
 686         __acquires(&bond->lock)
 687         __acquires(&bond->curr_slave_lock)
 688 {
 689         u8 tmp_mac[ETH_ALEN];
 690         struct sockaddr saddr;
 691         int rv;
 692
 693         switch (bond->params.fail_over_mac) {
 694         case BOND_FOM_ACTIVE:
 695                 if (new_active) {
 696                         write_unlock_bh(&bond->curr_slave_lock);
 697                         read_unlock(&bond->lock);
 698                         bond_set_dev_addr(bond->dev, new_active->dev);
 699                         read_lock(&bond->lock);
 700                         write_lock_bh(&bond->curr_slave_lock);
 701                 }
 702                 break;
 703         case BOND_FOM_FOLLOW:
 704                 /*
 705                  * if new_active && old_active, swap them
 706                  * if just old_active, do nothing (going to no active slave)
 707                  * if just new_active, set new_active to bond's MAC
 708                  */
 709                 if (!new_active)
 710                         return;
 711
 712                 write_unlock_bh(&bond->curr_slave_lock);
 713                 read_unlock(&bond->lock);
 714
 715                 if (old_active) {
 716                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
 717                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
 718                                ETH_ALEN);
 719                         saddr.sa_family = new_active->dev->type;
 720                 } else {
 721                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
 722                         saddr.sa_family = bond->dev->type;
 723                 }
 724
 725                 rv = dev_set_mac_address(new_active->dev, &saddr);
 726                 if (rv) {
 727                         pr_err("%s: Error %d setting MAC of slave %s\n",
 728                                bond->dev->name, -rv, new_active->dev->name);
 729                         goto out;
 730                 }
 731
 732                 if (!old_active)
 733                         goto out;
 734
 735                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
 736                 saddr.sa_family = old_active->dev->type;
 737
 738                 rv = dev_set_mac_address(old_active->dev, &saddr);
 739                 if (rv)
 740                         pr_err("%s: Error %d setting MAC of slave %s\n",
 741                                bond->dev->name, -rv, new_active->dev->name);
 742 out:
 743                 read_lock(&bond->lock);
 744                 write_lock_bh(&bond->curr_slave_lock);
 745                 break;
 746         default:
 747                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
 748                        bond->dev->name, bond->params.fail_over_mac);
 749                 break;
 750         }
 751
 752 }
 753
 754 static bool bond_should_change_active(struct bonding *bond)
 755 {
 756         struct slave *prim = bond->primary_slave;
 757         struct slave *curr = bond->curr_active_slave;
 758
 759         if (!prim || !curr || curr->link != BOND_LINK_UP)
 760                 return true;
 761         if (bond->force_primary) {
 762                 bond->force_primary = false;
 763                 return true;
 764         }
 765         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
 766             (prim->speed < curr->speed ||
 767              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
 768                 return false;
 769         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
 770                 return false;
 771         return true;
 772 }
 773
 774 /**
 775  * find_best_interface - select the best available slave to be the active one
 776  * @bond: our bonding struct
 777  *
 778  * Warning: Caller must hold curr_slave_lock for writing.
 779  */
 780 static struct slave *bond_find_best_slave(struct bonding *bond)
 781 {
 782         struct slave *new_active, *old_active;
 783         struct slave *bestslave = NULL;
 784         int mintime = bond->params.updelay;
 785         int i;
 786
 787         new_active = bond->curr_active_slave;
 788
 789         if (!new_active) { /* there were no active slaves left */
 790                 new_active = bond_first_slave(bond);
 791                 if (!new_active)
 792                         return NULL; /* still no slave, return NULL */
 793         }
 794
 795         if ((bond->primary_slave) &&
 796             bond->primary_slave->link == BOND_LINK_UP &&
 797             bond_should_change_active(bond)) {
 798                 new_active = bond->primary_slave;
 799         }
 800
 801         /* remember where to stop iterating over the slaves */
 802         old_active = new_active;
 803
 804         bond_for_each_slave_from(bond, new_active, i, old_active) {
 805                 if (new_active->link == BOND_LINK_UP) {
 806                         return new_active;
 807                 } else if (new_active->link == BOND_LINK_BACK &&
 808                            IS_UP(new_active->dev)) {
 809                         /* link up, but waiting for stabilization */
 810                         if (new_active->delay < mintime) {
 811                                 mintime = new_active->delay;
 812                                 bestslave = new_active;
 813                         }
 814                 }
 815         }
 816
 817         return bestslave;
 818 }
 819
 820 static bool bond_should_notify_peers(struct bonding *bond)
 821 {
 822         struct slave *slave = bond->curr_active_slave;
 823
 824         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
 825                  bond->dev->name, slave ? slave->dev->name : "NULL");
 826
 827         if (!slave || !bond->send_peer_notif ||
 828             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 829                 return false;
 830
 831         bond->send_peer_notif--;
 832         return true;
 833 }
 834
 835 /**
 836  * change_active_interface - change the active slave into the specified one
 837  * @bond: our bonding struct
 838  * @new: the new slave to make the active one
 839  *
 840  * Set the new slave to the bond's settings and unset them on the old
 841  * curr_active_slave.
 842  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 843  *
 844  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 845  * because it is apparently the best available slave we have, even though its
 846  * updelay hasn't timed out yet.
 847  *
 848  * If new_active is not NULL, caller must hold bond->lock for read and
 849  * curr_slave_lock for write_bh.
 850  */
 851 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 852 {
 853         struct slave *old_active = bond->curr_active_slave;
 854
 855         if (old_active == new_active)
 856                 return;
 857
 858         if (new_active) {
 859                 new_active->jiffies = jiffies;
 860
 861                 if (new_active->link == BOND_LINK_BACK) {
 862                         if (USES_PRIMARY(bond->params.mode)) {
 863                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
 864                                         bond->dev->name, new_active->dev->name,
 865                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
 866                         }
 867
 868                         new_active->delay = 0;
 869                         new_active->link = BOND_LINK_UP;
 870
 871                         if (bond->params.mode == BOND_MODE_8023AD)
 872                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 873
 874                         if (bond_is_lb(bond))
 875                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 876                 } else {
 877                         if (USES_PRIMARY(bond->params.mode)) {
 878                                 pr_info("%s: making interface %s the new active one.\n",
 879                                         bond->dev->name, new_active->dev->name);
 880                         }
 881                 }
 882         }
 883
 884         if (USES_PRIMARY(bond->params.mode))
 885                 bond_hw_addr_swap(bond, new_active, old_active);
 886
 887         if (bond_is_lb(bond)) {
 888                 bond_alb_handle_active_change(bond, new_active);
 889                 if (old_active)
 890                         bond_set_slave_inactive_flags(old_active);
 891                 if (new_active)
 892                         bond_set_slave_active_flags(new_active);
 893         } else {
 894                 rcu_assign_pointer(bond->curr_active_slave, new_active);
 895         }
 896
 897         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
 898                 if (old_active)
 899                         bond_set_slave_inactive_flags(old_active);
 900
 901                 if (new_active) {
 902                         bool should_notify_peers = false;
 903
 904                         bond_set_slave_active_flags(new_active);
 905
 906                         if (bond->params.fail_over_mac)
 907                                 bond_do_fail_over_mac(bond, new_active,
 908                                                       old_active);
 909
 910                         if (netif_running(bond->dev)) {
 911                                 bond->send_peer_notif =
 912                                         bond->params.num_peer_notif;
 913                                 should_notify_peers =
 914                                         bond_should_notify_peers(bond);
 915                         }
 916
 917                         write_unlock_bh(&bond->curr_slave_lock);
 918                         read_unlock(&bond->lock);
 919
 920                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 921                         if (should_notify_peers)
 922                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 923                                                          bond->dev);
 924
 925                         read_lock(&bond->lock);
 926                         write_lock_bh(&bond->curr_slave_lock);
 927                 }
 928         }
 929
 930         /* resend IGMP joins since active slave has changed or
 931          * all were sent on curr_active_slave.
 932          * resend only if bond is brought up with the affected
 933          * bonding modes and the retransmission is enabled */
 934         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 935             ((USES_PRIMARY(bond->params.mode) && new_active) ||
 936              bond->params.mode == BOND_MODE_ROUNDROBIN)) {
 937                 bond->igmp_retrans = bond->params.resend_igmp;
 938                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 939         }
 940 }
 941
 942 /**
 943  * bond_select_active_slave - select a new active slave, if needed
 944  * @bond: our bonding struct
 945  *
 946  * This functions should be called when one of the following occurs:
 947  * - The old curr_active_slave has been released or lost its link.
 948  * - The primary_slave has got its link back.
 949  * - A slave has got its link back and there's no old curr_active_slave.
 950  *
 951  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
 952  */
 953 void bond_select_active_slave(struct bonding *bond)
 954 {
 955         struct slave *best_slave;
 956         int rv;
 957
 958         best_slave = bond_find_best_slave(bond);
 959         if (best_slave != bond->curr_active_slave) {
 960                 bond_change_active_slave(bond, best_slave);
 961                 rv = bond_set_carrier(bond);
 962                 if (!rv)
 963                         return;
 964
 965                 if (netif_carrier_ok(bond->dev)) {
 966                         pr_info("%s: first active interface up!\n",
 967                                 bond->dev->name);
 968                 } else {
 969                         pr_info("%s: now running without any active interface !\n",
 970                                 bond->dev->name);
 971                 }
 972         }
 973 }
 974
 975 /*--------------------------- slave list handling ---------------------------*/
 976
 977 /*
 978  * This function attaches the slave to the end of list.
 979  *
 980  * bond->lock held for writing by caller.
 981  */
 982 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
 983 {
 984         list_add_tail_rcu(&new_slave->list, &bond->slave_list);
 985         bond->slave_cnt++;
 986 }
 987
 988 /*
 989  * This function detaches the slave from the list.
 990  * WARNING: no check is made to verify if the slave effectively
 991  * belongs to <bond>.
 992  * Nothing is freed on return, structures are just unchained.
 993  * If any slave pointer in bond was pointing to <slave>,
 994  * it should be changed by the calling function.
 995  *
 996  * bond->lock held for writing by caller.
 997  */
 998 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
 999 {
1000         list_del_rcu(&slave->list);
1001         bond->slave_cnt--;
1002 }
1003
1004 #ifdef CONFIG_NET_POLL_CONTROLLER
1005 static inline int slave_enable_netpoll(struct slave *slave)
1006 {
1007         struct netpoll *np;
1008         int err = 0;
1009
1010         np = kzalloc(sizeof(*np), GFP_ATOMIC);
1011         err = -ENOMEM;
1012         if (!np)
1013                 goto out;
1014
1015         err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
1016         if (err) {
1017                 kfree(np);
1018                 goto out;
1019         }
1020         slave->np = np;
1021 out:
1022         return err;
1023 }
1024 static inline void slave_disable_netpoll(struct slave *slave)
1025 {
1026         struct netpoll *np = slave->np;
1027
1028         if (!np)
1029                 return;
1030
1031         slave->np = NULL;
1032         __netpoll_free_async(np);
1033 }
1034 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1035 {
1036         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1037                 return false;
1038         if (!slave_dev->netdev_ops->ndo_poll_controller)
1039                 return false;
1040         return true;
1041 }
1042
1043 static void bond_poll_controller(struct net_device *bond_dev)
1044 {
1045 }
1046
1047 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1048 {
1049         struct bonding *bond = netdev_priv(bond_dev);
1050         struct slave *slave;
1051
1052         bond_for_each_slave(bond, slave)
1053                 if (IS_UP(slave->dev))
1054                         slave_disable_netpoll(slave);
1055 }
1056
1057 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
1058 {
1059         struct bonding *bond = netdev_priv(dev);
1060         struct slave *slave;
1061         int err = 0;
1062
1063         bond_for_each_slave(bond, slave) {
1064                 err = slave_enable_netpoll(slave);
1065                 if (err) {
1066                         bond_netpoll_cleanup(dev);
1067                         break;
1068                 }
1069         }
1070         return err;
1071 }
1072 #else
1073 static inline int slave_enable_netpoll(struct slave *slave)
1074 {
1075         return 0;
1076 }
1077 static inline void slave_disable_netpoll(struct slave *slave)
1078 {
1079 }
1080 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1081 {
1082 }
1083 #endif
1084
1085 /*---------------------------------- IOCTL ----------------------------------*/
1086
1087 static netdev_features_t bond_fix_features(struct net_device *dev,
1088         netdev_features_t features)
1089 {
1090         struct slave *slave;
1091         struct bonding *bond = netdev_priv(dev);
1092         netdev_features_t mask;
1093
1094         read_lock(&bond->lock);
1095
1096         if (list_empty(&bond->slave_list)) {
1097                 /* Disable adding VLANs to empty bond. But why? --mq */
1098                 features |= NETIF_F_VLAN_CHALLENGED;
1099                 goto out;
1100         }
1101
1102         mask = features;
1103         features &= ~NETIF_F_ONE_FOR_ALL;
1104         features |= NETIF_F_ALL_FOR_ALL;
1105
1106         bond_for_each_slave(bond, slave) {
1107                 features = netdev_increment_features(features,
1108                                                      slave->dev->features,
1109                                                      mask);
1110         }
1111         features = netdev_add_tso_features(features, mask);
1112
1113 out:
1114         read_unlock(&bond->lock);
1115         return features;
1116 }
1117
1118 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1119                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1120                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1121
1122 static void bond_compute_features(struct bonding *bond)
1123 {
1124         struct slave *slave;
1125         struct net_device *bond_dev = bond->dev;
1126         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1127         unsigned short max_hard_header_len = ETH_HLEN;
1128         unsigned int gso_max_size = GSO_MAX_SIZE;
1129         u16 gso_max_segs = GSO_MAX_SEGS;
1130         unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1131
1132         read_lock(&bond->lock);
1133
1134         if (list_empty(&bond->slave_list))
1135                 goto done;
1136
1137         bond_for_each_slave(bond, slave) {
1138                 vlan_features = netdev_increment_features(vlan_features,
1139                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1140
1141                 dst_release_flag &= slave->dev->priv_flags;
1142                 if (slave->dev->hard_header_len > max_hard_header_len)
1143                         max_hard_header_len = slave->dev->hard_header_len;
1144
1145                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1146                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1147         }
1148
1149 done:
1150         bond_dev->vlan_features = vlan_features;
1151         bond_dev->hard_header_len = max_hard_header_len;
1152         bond_dev->gso_max_segs = gso_max_segs;
1153         netif_set_gso_max_size(bond_dev, gso_max_size);
1154
1155         flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1156         bond_dev->priv_flags = flags | dst_release_flag;
1157
1158         read_unlock(&bond->lock);
1159
1160         netdev_change_features(bond_dev);
1161 }
1162
1163 static void bond_setup_by_slave(struct net_device *bond_dev,
1164                                 struct net_device *slave_dev)
1165 {
1166         bond_dev->header_ops        = slave_dev->header_ops;
1167
1168         bond_dev->type              = slave_dev->type;
1169         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1170         bond_dev->addr_len          = slave_dev->addr_len;
1171
1172         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1173                 slave_dev->addr_len);
1174 }
1175
1176 /* On bonding slaves other than the currently active slave, suppress
1177  * duplicates except for alb non-mcast/bcast.
1178  */
1179 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1180                                             struct slave *slave,
1181                                             struct bonding *bond)
1182 {
1183         if (bond_is_slave_inactive(slave)) {
1184                 if (bond->params.mode == BOND_MODE_ALB &&
1185                     skb->pkt_type != PACKET_BROADCAST &&
1186                     skb->pkt_type != PACKET_MULTICAST)
1187                         return false;
1188                 return true;
1189         }
1190         return false;
1191 }
1192
1193 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1194 {
1195         struct sk_buff *skb = *pskb;
1196         struct slave *slave;
1197         struct bonding *bond;
1198         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1199                           struct slave *);
1200         int ret = RX_HANDLER_ANOTHER;
1201
1202         skb = skb_share_check(skb, GFP_ATOMIC);
1203         if (unlikely(!skb))
1204                 return RX_HANDLER_CONSUMED;
1205
1206         *pskb = skb;
1207
1208         slave = bond_slave_get_rcu(skb->dev);
1209         bond = slave->bond;
1210
1211         if (bond->params.arp_interval)
1212                 slave->dev->last_rx = jiffies;
1213
1214         recv_probe = ACCESS_ONCE(bond->recv_probe);
1215         if (recv_probe) {
1216                 ret = recv_probe(skb, bond, slave);
1217                 if (ret == RX_HANDLER_CONSUMED) {
1218                         consume_skb(skb);
1219                         return ret;
1220                 }
1221         }
1222
1223         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1224                 return RX_HANDLER_EXACT;
1225         }
1226
1227         skb->dev = bond->dev;
1228
1229         if (bond->params.mode == BOND_MODE_ALB &&
1230             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1231             skb->pkt_type == PACKET_HOST) {
1232
1233                 if (unlikely(skb_cow_head(skb,
1234                                           skb->data - skb_mac_header(skb)))) {
1235                         kfree_skb(skb);
1236                         return RX_HANDLER_CONSUMED;
1237                 }
1238                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1239         }
1240
1241         return ret;
1242 }
1243
1244 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1245                                       struct net_device *slave_dev)
1246 {
1247         int err;
1248
1249         err = netdev_master_upper_dev_link(slave_dev, bond_dev);
1250         if (err)
1251                 return err;
1252         slave_dev->flags |= IFF_SLAVE;
1253         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1254         return 0;
1255 }
1256
1257 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1258                                   struct net_device *slave_dev)
1259 {
1260         netdev_upper_dev_unlink(slave_dev, bond_dev);
1261         slave_dev->flags &= ~IFF_SLAVE;
1262         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1263 }
1264
1265 /* enslave device <slave> to bond device <master> */
1266 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1267 {
1268         struct bonding *bond = netdev_priv(bond_dev);
1269         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1270         struct slave *new_slave = NULL;
1271         struct sockaddr addr;
1272         int link_reporting;
1273         int res = 0, i;
1274
1275         if (!bond->params.use_carrier &&
1276             slave_dev->ethtool_ops->get_link == NULL &&
1277             slave_ops->ndo_do_ioctl == NULL) {
1278                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1279                            bond_dev->name, slave_dev->name);
1280         }
1281
1282         /* already enslaved */
1283         if (slave_dev->flags & IFF_SLAVE) {
1284                 pr_debug("Error, Device was already enslaved\n");
1285                 return -EBUSY;
1286         }
1287
1288         /* vlan challenged mutual exclusion */
1289         /* no need to lock since we're protected by rtnl_lock */
1290         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1291                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1292                 if (vlan_uses_dev(bond_dev)) {
1293                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1294                                bond_dev->name, slave_dev->name, bond_dev->name);
1295                         return -EPERM;
1296                 } else {
1297                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1298                                    bond_dev->name, slave_dev->name,
1299                                    slave_dev->name, bond_dev->name);
1300                 }
1301         } else {
1302                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1303         }
1304
1305         /*
1306          * Old ifenslave binaries are no longer supported.  These can
1307          * be identified with moderate accuracy by the state of the slave:
1308          * the current ifenslave will set the interface down prior to
1309          * enslaving it; the old ifenslave will not.
1310          */
1311         if ((slave_dev->flags & IFF_UP)) {
1312                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1313                        slave_dev->name);
1314                 res = -EPERM;
1315                 goto err_undo_flags;
1316         }
1317
1318         /* set bonding device ether type by slave - bonding netdevices are
1319          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1320          * there is a need to override some of the type dependent attribs/funcs.
1321          *
1322          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1323          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1324          */
1325         if (list_empty(&bond->slave_list)) {
1326                 if (bond_dev->type != slave_dev->type) {
1327                         pr_debug("%s: change device type from %d to %d\n",
1328                                  bond_dev->name,
1329                                  bond_dev->type, slave_dev->type);
1330
1331                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1332                                                        bond_dev);
1333                         res = notifier_to_errno(res);
1334                         if (res) {
1335                                 pr_err("%s: refused to change device type\n",
1336                                        bond_dev->name);
1337                                 res = -EBUSY;
1338                                 goto err_undo_flags;
1339                         }
1340
1341                         /* Flush unicast and multicast addresses */
1342                         dev_uc_flush(bond_dev);
1343                         dev_mc_flush(bond_dev);
1344
1345                         if (slave_dev->type != ARPHRD_ETHER)
1346                                 bond_setup_by_slave(bond_dev, slave_dev);
1347                         else {
1348                                 ether_setup(bond_dev);
1349                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1350                         }
1351
1352                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1353                                                  bond_dev);
1354                 }
1355         } else if (bond_dev->type != slave_dev->type) {
1356                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1357                        slave_dev->name,
1358                        slave_dev->type, bond_dev->type);
1359                 res = -EINVAL;
1360                 goto err_undo_flags;
1361         }
1362
1363         if (slave_ops->ndo_set_mac_address == NULL) {
1364                 if (list_empty(&bond->slave_list)) {
1365                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1366                                    bond_dev->name);
1367                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1368                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1369                         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",
1370                                bond_dev->name);
1371                         res = -EOPNOTSUPP;
1372                         goto err_undo_flags;
1373                 }
1374         }
1375
1376         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1377
1378         /* If this is the first slave, then we need to set the master's hardware
1379          * address to be the same as the slave's. */
1380         if (list_empty(&bond->slave_list) &&
1381             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1382                 bond_set_dev_addr(bond->dev, slave_dev);
1383
1384         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1385         if (!new_slave) {
1386                 res = -ENOMEM;
1387                 goto err_undo_flags;
1388         }
1389         INIT_LIST_HEAD(&new_slave->list);
1390         /*
1391          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1392          * is set via sysfs or module option if desired.
1393          */
1394         new_slave->queue_id = 0;
1395
1396         /* Save slave's original mtu and then set it to match the bond */
1397         new_slave->original_mtu = slave_dev->mtu;
1398         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1399         if (res) {
1400                 pr_debug("Error %d calling dev_set_mtu\n", res);
1401                 goto err_free;
1402         }
1403
1404         /*
1405          * Save slave's original ("permanent") mac address for modes
1406          * that need it, and for restoring it upon release, and then
1407          * set it to the master's address
1408          */
1409         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1410
1411         if (!bond->params.fail_over_mac) {
1412                 /*
1413                  * Set slave to master's mac address.  The application already
1414                  * set the master's mac address to that of the first slave
1415                  */
1416                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1417                 addr.sa_family = slave_dev->type;
1418                 res = dev_set_mac_address(slave_dev, &addr);
1419                 if (res) {
1420                         pr_debug("Error %d calling set_mac_address\n", res);
1421                         goto err_restore_mtu;
1422                 }
1423         }
1424
1425         res = bond_master_upper_dev_link(bond_dev, slave_dev);
1426         if (res) {
1427                 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1428                 goto err_restore_mac;
1429         }
1430
1431         /* open the slave since the application closed it */
1432         res = dev_open(slave_dev);
1433         if (res) {
1434                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1435                 goto err_unset_master;
1436         }
1437
1438         new_slave->bond = bond;
1439         new_slave->dev = slave_dev;
1440         slave_dev->priv_flags |= IFF_BONDING;
1441
1442         if (bond_is_lb(bond)) {
1443                 /* bond_alb_init_slave() must be called before all other stages since
1444                  * it might fail and we do not want to have to undo everything
1445                  */
1446                 res = bond_alb_init_slave(bond, new_slave);
1447                 if (res)
1448                         goto err_close;
1449         }
1450
1451         /* If the mode USES_PRIMARY, then the following is handled by
1452          * bond_change_active_slave().
1453          */
1454         if (!USES_PRIMARY(bond->params.mode)) {
1455                 /* set promiscuity level to new slave */
1456                 if (bond_dev->flags & IFF_PROMISC) {
1457                         res = dev_set_promiscuity(slave_dev, 1);
1458                         if (res)
1459                                 goto err_close;
1460                 }
1461
1462                 /* set allmulti level to new slave */
1463                 if (bond_dev->flags & IFF_ALLMULTI) {
1464                         res = dev_set_allmulti(slave_dev, 1);
1465                         if (res)
1466                                 goto err_close;
1467                 }
1468
1469                 netif_addr_lock_bh(bond_dev);
1470
1471                 dev_mc_sync_multiple(slave_dev, bond_dev);
1472                 dev_uc_sync_multiple(slave_dev, bond_dev);
1473
1474                 netif_addr_unlock_bh(bond_dev);
1475         }
1476
1477         if (bond->params.mode == BOND_MODE_8023AD) {
1478                 /* add lacpdu mc addr to mc list */
1479                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1480
1481                 dev_mc_add(slave_dev, lacpdu_multicast);
1482         }
1483
1484         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1485         if (res) {
1486                 pr_err("%s: Error: Couldn't add bond vlan ids to %s\n",
1487                        bond_dev->name, slave_dev->name);
1488                 goto err_close;
1489         }
1490
1491         write_lock_bh(&bond->lock);
1492
1493         bond_attach_slave(bond, new_slave);
1494
1495         new_slave->delay = 0;
1496         new_slave->link_failure_count = 0;
1497
1498         write_unlock_bh(&bond->lock);
1499
1500         bond_compute_features(bond);
1501
1502         bond_update_speed_duplex(new_slave);
1503
1504         read_lock(&bond->lock);
1505
1506         new_slave->last_arp_rx = jiffies -
1507                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1508         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1509                 new_slave->target_last_arp_rx[i] = new_slave->last_arp_rx;
1510
1511         if (bond->params.miimon && !bond->params.use_carrier) {
1512                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1513
1514                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1515                         /*
1516                          * miimon is set but a bonded network driver
1517                          * does not support ETHTOOL/MII and
1518                          * arp_interval is not set.  Note: if
1519                          * use_carrier is enabled, we will never go
1520                          * here (because netif_carrier is always
1521                          * supported); thus, we don't need to change
1522                          * the messages for netif_carrier.
1523                          */
1524                         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",
1525                                bond_dev->name, slave_dev->name);
1526                 } else if (link_reporting == -1) {
1527                         /* unable get link status using mii/ethtool */
1528                         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",
1529                                    bond_dev->name, slave_dev->name);
1530                 }
1531         }
1532
1533         /* check for initial state */
1534         if (bond->params.miimon) {
1535                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1536                         if (bond->params.updelay) {
1537                                 new_slave->link = BOND_LINK_BACK;
1538                                 new_slave->delay = bond->params.updelay;
1539                         } else {
1540                                 new_slave->link = BOND_LINK_UP;
1541                         }
1542                 } else {
1543                         new_slave->link = BOND_LINK_DOWN;
1544                 }
1545         } else if (bond->params.arp_interval) {
1546                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1547                         BOND_LINK_UP : BOND_LINK_DOWN);
1548         } else {
1549                 new_slave->link = BOND_LINK_UP;
1550         }
1551
1552         if (new_slave->link != BOND_LINK_DOWN)
1553                 new_slave->jiffies = jiffies;
1554         pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1555                 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1556                         (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1557
1558         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1559                 /* if there is a primary slave, remember it */
1560                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1561                         bond->primary_slave = new_slave;
1562                         bond->force_primary = true;
1563                 }
1564         }
1565
1566         write_lock_bh(&bond->curr_slave_lock);
1567
1568         switch (bond->params.mode) {
1569         case BOND_MODE_ACTIVEBACKUP:
1570                 bond_set_slave_inactive_flags(new_slave);
1571                 bond_select_active_slave(bond);
1572                 break;
1573         case BOND_MODE_8023AD:
1574                 /* in 802.3ad mode, the internal mechanism
1575                  * will activate the slaves in the selected
1576                  * aggregator
1577                  */
1578                 bond_set_slave_inactive_flags(new_slave);
1579                 /* if this is the first slave */
1580                 if (bond_first_slave(bond) == new_slave) {
1581                         SLAVE_AD_INFO(new_slave).id = 1;
1582                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1583                          * can be called only after the mac address of the bond is set
1584                          */
1585                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1586                 } else {
1587                         struct slave *prev_slave;
1588
1589                         prev_slave = bond_prev_slave(bond, new_slave);
1590                         SLAVE_AD_INFO(new_slave).id =
1591                                 SLAVE_AD_INFO(prev_slave).id + 1;
1592                 }
1593
1594                 bond_3ad_bind_slave(new_slave);
1595                 break;
1596         case BOND_MODE_TLB:
1597         case BOND_MODE_ALB:
1598                 bond_set_active_slave(new_slave);
1599                 bond_set_slave_inactive_flags(new_slave);
1600                 bond_select_active_slave(bond);
1601                 break;
1602         default:
1603                 pr_debug("This slave is always active in trunk mode\n");
1604
1605                 /* always active in trunk mode */
1606                 bond_set_active_slave(new_slave);
1607
1608                 /* In trunking mode there is little meaning to curr_active_slave
1609                  * anyway (it holds no special properties of the bond device),
1610                  * so we can change it without calling change_active_interface()
1611                  */
1612                 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1613                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1614
1615                 break;
1616         } /* switch(bond_mode) */
1617
1618         write_unlock_bh(&bond->curr_slave_lock);
1619
1620         bond_set_carrier(bond);
1621
1622 #ifdef CONFIG_NET_POLL_CONTROLLER
1623         slave_dev->npinfo = bond->dev->npinfo;
1624         if (slave_dev->npinfo) {
1625                 if (slave_enable_netpoll(new_slave)) {
1626                         read_unlock(&bond->lock);
1627                         pr_info("Error, %s: master_dev is using netpoll, "
1628                                  "but new slave device does not support netpoll.\n",
1629                                  bond_dev->name);
1630                         res = -EBUSY;
1631                         goto err_detach;
1632                 }
1633         }
1634 #endif
1635
1636         read_unlock(&bond->lock);
1637
1638         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1639         if (res)
1640                 goto err_detach;
1641
1642         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1643                                          new_slave);
1644         if (res) {
1645                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1646                 goto err_dest_symlinks;
1647         }
1648
1649         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1650                 bond_dev->name, slave_dev->name,
1651                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1652                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1653
1654         /* enslave is successful */
1655         return 0;
1656
1657 /* Undo stages on error */
1658 err_dest_symlinks:
1659         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1660
1661 err_detach:
1662         if (!USES_PRIMARY(bond->params.mode))
1663                 bond_hw_addr_flush(bond_dev, slave_dev);
1664
1665         vlan_vids_del_by_dev(slave_dev, bond_dev);
1666         write_lock_bh(&bond->lock);
1667         bond_detach_slave(bond, new_slave);
1668         if (bond->primary_slave == new_slave)
1669                 bond->primary_slave = NULL;
1670         if (bond->curr_active_slave == new_slave) {
1671                 bond_change_active_slave(bond, NULL);
1672                 write_unlock_bh(&bond->lock);
1673                 read_lock(&bond->lock);
1674                 write_lock_bh(&bond->curr_slave_lock);
1675                 bond_select_active_slave(bond);
1676                 write_unlock_bh(&bond->curr_slave_lock);
1677                 read_unlock(&bond->lock);
1678         } else {
1679                 write_unlock_bh(&bond->lock);
1680         }
1681         slave_disable_netpoll(new_slave);
1682
1683 err_close:
1684         slave_dev->priv_flags &= ~IFF_BONDING;
1685         dev_close(slave_dev);
1686
1687 err_unset_master:
1688         bond_upper_dev_unlink(bond_dev, slave_dev);
1689
1690 err_restore_mac:
1691         if (!bond->params.fail_over_mac) {
1692                 /* XXX TODO - fom follow mode needs to change master's
1693                  * MAC if this slave's MAC is in use by the bond, or at
1694                  * least print a warning.
1695                  */
1696                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1697                 addr.sa_family = slave_dev->type;
1698                 dev_set_mac_address(slave_dev, &addr);
1699         }
1700
1701 err_restore_mtu:
1702         dev_set_mtu(slave_dev, new_slave->original_mtu);
1703
1704 err_free:
1705         kfree(new_slave);
1706
1707 err_undo_flags:
1708         bond_compute_features(bond);
1709         /* Enslave of first slave has failed and we need to fix master's mac */
1710         if (list_empty(&bond->slave_list) &&
1711             ether_addr_equal(bond_dev->dev_addr, slave_dev->dev_addr))
1712                 eth_hw_addr_random(bond_dev);
1713
1714         return res;
1715 }
1716
1717 /*
1718  * Try to release the slave device <slave> from the bond device <master>
1719  * It is legal to access curr_active_slave without a lock because all the function
1720  * is write-locked. If "all" is true it means that the function is being called
1721  * while destroying a bond interface and all slaves are being released.
1722  *
1723  * The rules for slave state should be:
1724  *   for Active/Backup:
1725  *     Active stays on all backups go down
1726  *   for Bonded connections:
1727  *     The first up interface should be left on and all others downed.
1728  */
1729 static int __bond_release_one(struct net_device *bond_dev,
1730                               struct net_device *slave_dev,
1731                               bool all)
1732 {
1733         struct bonding *bond = netdev_priv(bond_dev);
1734         struct slave *slave, *oldcurrent;
1735         struct sockaddr addr;
1736         netdev_features_t old_features = bond_dev->features;
1737
1738         /* slave is not a slave or master is not master of this slave */
1739         if (!(slave_dev->flags & IFF_SLAVE) ||
1740             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1741                 pr_err("%s: Error: cannot release %s.\n",
1742                        bond_dev->name, slave_dev->name);
1743                 return -EINVAL;
1744         }
1745
1746         block_netpoll_tx();
1747         write_lock_bh(&bond->lock);
1748
1749         slave = bond_get_slave_by_dev(bond, slave_dev);
1750         if (!slave) {
1751                 /* not a slave of this bond */
1752                 pr_info("%s: %s not enslaved\n",
1753                         bond_dev->name, slave_dev->name);
1754                 write_unlock_bh(&bond->lock);
1755                 unblock_netpoll_tx();
1756                 return -EINVAL;
1757         }
1758
1759         write_unlock_bh(&bond->lock);
1760         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1761          * for this slave anymore.
1762          */
1763         netdev_rx_handler_unregister(slave_dev);
1764         write_lock_bh(&bond->lock);
1765
1766         /* Inform AD package of unbinding of slave. */
1767         if (bond->params.mode == BOND_MODE_8023AD) {
1768                 /* must be called before the slave is
1769                  * detached from the list
1770                  */
1771                 bond_3ad_unbind_slave(slave);
1772         }
1773
1774         pr_info("%s: releasing %s interface %s\n",
1775                 bond_dev->name,
1776                 bond_is_active_slave(slave) ? "active" : "backup",
1777                 slave_dev->name);
1778
1779         oldcurrent = bond->curr_active_slave;
1780
1781         bond->current_arp_slave = NULL;
1782
1783         /* release the slave from its bond */
1784         bond_detach_slave(bond, slave);
1785
1786         if (!all && !bond->params.fail_over_mac) {
1787                 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
1788                     !list_empty(&bond->slave_list))
1789                         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",
1790                                    bond_dev->name, slave_dev->name,
1791                                    slave->perm_hwaddr,
1792                                    bond_dev->name, slave_dev->name);
1793         }
1794
1795         if (bond->primary_slave == slave)
1796                 bond->primary_slave = NULL;
1797
1798         if (oldcurrent == slave)
1799                 bond_change_active_slave(bond, NULL);
1800
1801         if (bond_is_lb(bond)) {
1802                 /* Must be called only after the slave has been
1803                  * detached from the list and the curr_active_slave
1804                  * has been cleared (if our_slave == old_current),
1805                  * but before a new active slave is selected.
1806                  */
1807                 write_unlock_bh(&bond->lock);
1808                 bond_alb_deinit_slave(bond, slave);
1809                 write_lock_bh(&bond->lock);
1810         }
1811
1812         if (all) {
1813                 rcu_assign_pointer(bond->curr_active_slave, NULL);
1814         } else if (oldcurrent == slave) {
1815                 /*
1816                  * Note that we hold RTNL over this sequence, so there
1817                  * is no concern that another slave add/remove event
1818                  * will interfere.
1819                  */
1820                 write_unlock_bh(&bond->lock);
1821                 read_lock(&bond->lock);
1822                 write_lock_bh(&bond->curr_slave_lock);
1823
1824                 bond_select_active_slave(bond);
1825
1826                 write_unlock_bh(&bond->curr_slave_lock);
1827                 read_unlock(&bond->lock);
1828                 write_lock_bh(&bond->lock);
1829         }
1830
1831         if (list_empty(&bond->slave_list)) {
1832                 bond_set_carrier(bond);
1833                 eth_hw_addr_random(bond_dev);
1834
1835                 if (vlan_uses_dev(bond_dev)) {
1836                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1837                                    bond_dev->name, bond_dev->name);
1838                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1839                                    bond_dev->name);
1840                 }
1841         }
1842
1843         write_unlock_bh(&bond->lock);
1844         unblock_netpoll_tx();
1845         synchronize_rcu();
1846
1847         if (list_empty(&bond->slave_list)) {
1848                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1849                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1850         }
1851
1852         bond_compute_features(bond);
1853         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1854             (old_features & NETIF_F_VLAN_CHALLENGED))
1855                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1856                         bond_dev->name, slave_dev->name, bond_dev->name);
1857
1858         /* must do this from outside any spinlocks */
1859         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1860
1861         vlan_vids_del_by_dev(slave_dev, bond_dev);
1862
1863         /* If the mode USES_PRIMARY, then this cases was handled above by
1864          * bond_change_active_slave(..., NULL)
1865          */
1866         if (!USES_PRIMARY(bond->params.mode)) {
1867                 /* unset promiscuity level from slave */
1868                 if (bond_dev->flags & IFF_PROMISC)
1869                         dev_set_promiscuity(slave_dev, -1);
1870
1871                 /* unset allmulti level from slave */
1872                 if (bond_dev->flags & IFF_ALLMULTI)
1873                         dev_set_allmulti(slave_dev, -1);
1874
1875                 bond_hw_addr_flush(bond_dev, slave_dev);
1876         }
1877
1878         bond_upper_dev_unlink(bond_dev, slave_dev);
1879
1880         slave_disable_netpoll(slave);
1881
1882         /* close slave before restoring its mac address */
1883         dev_close(slave_dev);
1884
1885         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1886                 /* restore original ("permanent") mac address */
1887                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1888                 addr.sa_family = slave_dev->type;
1889                 dev_set_mac_address(slave_dev, &addr);
1890         }
1891
1892         dev_set_mtu(slave_dev, slave->original_mtu);
1893
1894         slave_dev->priv_flags &= ~IFF_BONDING;
1895
1896         kfree(slave);
1897
1898         return 0;  /* deletion OK */
1899 }
1900
1901 /* A wrapper used because of ndo_del_link */
1902 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1903 {
1904         return __bond_release_one(bond_dev, slave_dev, false);
1905 }
1906
1907 /*
1908 * First release a slave and then destroy the bond if no more slaves are left.
1909 * Must be under rtnl_lock when this function is called.
1910 */
1911 static int  bond_release_and_destroy(struct net_device *bond_dev,
1912                                      struct net_device *slave_dev)
1913 {
1914         struct bonding *bond = netdev_priv(bond_dev);
1915         int ret;
1916
1917         ret = bond_release(bond_dev, slave_dev);
1918         if (ret == 0 && list_empty(&bond->slave_list)) {
1919                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1920                 pr_info("%s: destroying bond %s.\n",
1921                         bond_dev->name, bond_dev->name);
1922                 unregister_netdevice(bond_dev);
1923         }
1924         return ret;
1925 }
1926
1927 /*
1928  * This function changes the active slave to slave <slave_dev>.
1929  * It returns -EINVAL in the following cases.
1930  *  - <slave_dev> is not found in the list.
1931  *  - There is not active slave now.
1932  *  - <slave_dev> is already active.
1933  *  - The link state of <slave_dev> is not BOND_LINK_UP.
1934  *  - <slave_dev> is not running.
1935  * In these cases, this function does nothing.
1936  * In the other cases, current_slave pointer is changed and 0 is returned.
1937  */
1938 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1939 {
1940         struct bonding *bond = netdev_priv(bond_dev);
1941         struct slave *old_active = NULL;
1942         struct slave *new_active = NULL;
1943         int res = 0;
1944
1945         if (!USES_PRIMARY(bond->params.mode))
1946                 return -EINVAL;
1947
1948         /* Verify that bond_dev is indeed the master of slave_dev */
1949         if (!(slave_dev->flags & IFF_SLAVE) ||
1950             !netdev_has_upper_dev(slave_dev, bond_dev))
1951                 return -EINVAL;
1952
1953         read_lock(&bond->lock);
1954
1955         old_active = bond->curr_active_slave;
1956         new_active = bond_get_slave_by_dev(bond, slave_dev);
1957         /*
1958          * Changing to the current active: do nothing; return success.
1959          */
1960         if (new_active && new_active == old_active) {
1961                 read_unlock(&bond->lock);
1962                 return 0;
1963         }
1964
1965         if (new_active &&
1966             old_active &&
1967             new_active->link == BOND_LINK_UP &&
1968             IS_UP(new_active->dev)) {
1969                 block_netpoll_tx();
1970                 write_lock_bh(&bond->curr_slave_lock);
1971                 bond_change_active_slave(bond, new_active);
1972                 write_unlock_bh(&bond->curr_slave_lock);
1973                 unblock_netpoll_tx();
1974         } else
1975                 res = -EINVAL;
1976
1977         read_unlock(&bond->lock);
1978
1979         return res;
1980 }
1981
1982 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1983 {
1984         struct bonding *bond = netdev_priv(bond_dev);
1985
1986         info->bond_mode = bond->params.mode;
1987         info->miimon = bond->params.miimon;
1988
1989         read_lock(&bond->lock);
1990         info->num_slaves = bond->slave_cnt;
1991         read_unlock(&bond->lock);
1992
1993         return 0;
1994 }
1995
1996 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1997 {
1998         struct bonding *bond = netdev_priv(bond_dev);
1999         int i = 0, res = -ENODEV;
2000         struct slave *slave;
2001
2002         read_lock(&bond->lock);
2003         bond_for_each_slave(bond, slave) {
2004                 if (i++ == (int)info->slave_id) {
2005                         res = 0;
2006                         strcpy(info->slave_name, slave->dev->name);
2007                         info->link = slave->link;
2008                         info->state = bond_slave_state(slave);
2009                         info->link_failure_count = slave->link_failure_count;
2010                         break;
2011                 }
2012         }
2013         read_unlock(&bond->lock);
2014
2015         return res;
2016 }
2017
2018 /*-------------------------------- Monitoring -------------------------------*/
2019
2020
2021 static int bond_miimon_inspect(struct bonding *bond)
2022 {
2023         int link_state, commit = 0;
2024         struct slave *slave;
2025         bool ignore_updelay;
2026
2027         ignore_updelay = !bond->curr_active_slave ? true : false;
2028
2029         bond_for_each_slave(bond, slave) {
2030                 slave->new_link = BOND_LINK_NOCHANGE;
2031
2032                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2033
2034                 switch (slave->link) {
2035                 case BOND_LINK_UP:
2036                         if (link_state)
2037                                 continue;
2038
2039                         slave->link = BOND_LINK_FAIL;
2040                         slave->delay = bond->params.downdelay;
2041                         if (slave->delay) {
2042                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2043                                         bond->dev->name,
2044                                         (bond->params.mode ==
2045                                          BOND_MODE_ACTIVEBACKUP) ?
2046                                         (bond_is_active_slave(slave) ?
2047                                          "active " : "backup ") : "",
2048                                         slave->dev->name,
2049                                         bond->params.downdelay * bond->params.miimon);
2050                         }
2051                         /*FALLTHRU*/
2052                 case BOND_LINK_FAIL:
2053                         if (link_state) {
2054                                 /*
2055                                  * recovered before downdelay expired
2056                                  */
2057                                 slave->link = BOND_LINK_UP;
2058                                 slave->jiffies = jiffies;
2059                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2060                                         bond->dev->name,
2061                                         (bond->params.downdelay - slave->delay) *
2062                                         bond->params.miimon,
2063                                         slave->dev->name);
2064                                 continue;
2065                         }
2066
2067                         if (slave->delay <= 0) {
2068                                 slave->new_link = BOND_LINK_DOWN;
2069                                 commit++;
2070                                 continue;
2071                         }
2072
2073                         slave->delay--;
2074                         break;
2075
2076                 case BOND_LINK_DOWN:
2077                         if (!link_state)
2078                                 continue;
2079
2080                         slave->link = BOND_LINK_BACK;
2081                         slave->delay = bond->params.updelay;
2082
2083                         if (slave->delay) {
2084                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2085                                         bond->dev->name, slave->dev->name,
2086                                         ignore_updelay ? 0 :
2087                                         bond->params.updelay *
2088                                         bond->params.miimon);
2089                         }
2090                         /*FALLTHRU*/
2091                 case BOND_LINK_BACK:
2092                         if (!link_state) {
2093                                 slave->link = BOND_LINK_DOWN;
2094                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2095                                         bond->dev->name,
2096                                         (bond->params.updelay - slave->delay) *
2097                                         bond->params.miimon,
2098                                         slave->dev->name);
2099
2100                                 continue;
2101                         }
2102
2103                         if (ignore_updelay)
2104                                 slave->delay = 0;
2105
2106                         if (slave->delay <= 0) {
2107                                 slave->new_link = BOND_LINK_UP;
2108                                 commit++;
2109                                 ignore_updelay = false;
2110                                 continue;
2111                         }
2112
2113                         slave->delay--;
2114                         break;
2115                 }
2116         }
2117
2118         return commit;
2119 }
2120
2121 static void bond_miimon_commit(struct bonding *bond)
2122 {
2123         struct slave *slave;
2124
2125         bond_for_each_slave(bond, slave) {
2126                 switch (slave->new_link) {
2127                 case BOND_LINK_NOCHANGE:
2128                         continue;
2129
2130                 case BOND_LINK_UP:
2131                         slave->link = BOND_LINK_UP;
2132                         slave->jiffies = jiffies;
2133
2134                         if (bond->params.mode == BOND_MODE_8023AD) {
2135                                 /* prevent it from being the active one */
2136                                 bond_set_backup_slave(slave);
2137                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2138                                 /* make it immediately active */
2139                                 bond_set_active_slave(slave);
2140                         } else if (slave != bond->primary_slave) {
2141                                 /* prevent it from being the active one */
2142                                 bond_set_backup_slave(slave);
2143                         }
2144
2145                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2146                                 bond->dev->name, slave->dev->name,
2147                                 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2148                                 slave->duplex ? "full" : "half");
2149
2150                         /* notify ad that the link status has changed */
2151                         if (bond->params.mode == BOND_MODE_8023AD)
2152                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2153
2154                         if (bond_is_lb(bond))
2155                                 bond_alb_handle_link_change(bond, slave,
2156                                                             BOND_LINK_UP);
2157
2158                         if (!bond->curr_active_slave ||
2159                             (slave == bond->primary_slave))
2160                                 goto do_failover;
2161
2162                         continue;
2163
2164                 case BOND_LINK_DOWN:
2165                         if (slave->link_failure_count < UINT_MAX)
2166                                 slave->link_failure_count++;
2167
2168                         slave->link = BOND_LINK_DOWN;
2169
2170                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2171                             bond->params.mode == BOND_MODE_8023AD)
2172                                 bond_set_slave_inactive_flags(slave);
2173
2174                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2175                                 bond->dev->name, slave->dev->name);
2176
2177                         if (bond->params.mode == BOND_MODE_8023AD)
2178                                 bond_3ad_handle_link_change(slave,
2179                                                             BOND_LINK_DOWN);
2180
2181                         if (bond_is_lb(bond))
2182                                 bond_alb_handle_link_change(bond, slave,
2183                                                             BOND_LINK_DOWN);
2184
2185                         if (slave == bond->curr_active_slave)
2186                                 goto do_failover;
2187
2188                         continue;
2189
2190                 default:
2191                         pr_err("%s: invalid new link %d on slave %s\n",
2192                                bond->dev->name, slave->new_link,
2193                                slave->dev->name);
2194                         slave->new_link = BOND_LINK_NOCHANGE;
2195
2196                         continue;
2197                 }
2198
2199 do_failover:
2200                 ASSERT_RTNL();
2201                 block_netpoll_tx();
2202                 write_lock_bh(&bond->curr_slave_lock);
2203                 bond_select_active_slave(bond);
2204                 write_unlock_bh(&bond->curr_slave_lock);
2205                 unblock_netpoll_tx();
2206         }
2207
2208         bond_set_carrier(bond);
2209 }
2210
2211 /*
2212  * bond_mii_monitor
2213  *
2214  * Really a wrapper that splits the mii monitor into two phases: an
2215  * inspection, then (if inspection indicates something needs to be done)
2216  * an acquisition of appropriate locks followed by a commit phase to
2217  * implement whatever link state changes are indicated.
2218  */
2219 void bond_mii_monitor(struct work_struct *work)
2220 {
2221         struct bonding *bond = container_of(work, struct bonding,
2222                                             mii_work.work);
2223         bool should_notify_peers = false;
2224         unsigned long delay;
2225
2226         read_lock(&bond->lock);
2227
2228         delay = msecs_to_jiffies(bond->params.miimon);
2229
2230         if (list_empty(&bond->slave_list))
2231                 goto re_arm;
2232
2233         should_notify_peers = bond_should_notify_peers(bond);
2234
2235         if (bond_miimon_inspect(bond)) {
2236                 read_unlock(&bond->lock);
2237
2238                 /* Race avoidance with bond_close cancel of workqueue */
2239                 if (!rtnl_trylock()) {
2240                         read_lock(&bond->lock);
2241                         delay = 1;
2242                         should_notify_peers = false;
2243                         goto re_arm;
2244                 }
2245
2246                 read_lock(&bond->lock);
2247
2248                 bond_miimon_commit(bond);
2249
2250                 read_unlock(&bond->lock);
2251                 rtnl_unlock();  /* might sleep, hold no other locks */
2252                 read_lock(&bond->lock);
2253         }
2254
2255 re_arm:
2256         if (bond->params.miimon)
2257                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2258
2259         read_unlock(&bond->lock);
2260
2261         if (should_notify_peers) {
2262                 if (!rtnl_trylock()) {
2263                         read_lock(&bond->lock);
2264                         bond->send_peer_notif++;
2265                         read_unlock(&bond->lock);
2266                         return;
2267                 }
2268                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2269                 rtnl_unlock();
2270         }
2271 }
2272
2273 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2274 {
2275         struct net_device *upper;
2276         struct list_head *iter;
2277         bool ret = false;
2278
2279         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2280                 return true;
2281
2282         rcu_read_lock();
2283         netdev_for_each_upper_dev_rcu(bond->dev, upper, iter) {
2284                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2285                         ret = true;
2286                         break;
2287                 }
2288         }
2289         rcu_read_unlock();
2290
2291         return ret;
2292 }
2293
2294 /*
2295  * We go to the (large) trouble of VLAN tagging ARP frames because
2296  * switches in VLAN mode (especially if ports are configured as
2297  * "native" to a VLAN) might not pass non-tagged frames.
2298  */
2299 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2300 {
2301         struct sk_buff *skb;
2302
2303         pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op,
2304                  slave_dev->name, &dest_ip, &src_ip, vlan_id);
2305
2306         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2307                          NULL, slave_dev->dev_addr, NULL);
2308
2309         if (!skb) {
2310                 pr_err("ARP packet allocation failed\n");
2311                 return;
2312         }
2313         if (vlan_id) {
2314                 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2315                 if (!skb) {
2316                         pr_err("failed to insert VLAN tag\n");
2317                         return;
2318                 }
2319         }
2320         arp_xmit(skb);
2321 }
2322
2323
2324 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2325 {
2326         struct net_device *upper, *vlan_upper;
2327         struct list_head *iter, *vlan_iter;
2328         struct rtable *rt;
2329         __be32 *targets = bond->params.arp_targets, addr;
2330         int i, vlan_id;
2331
2332         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2333                 pr_debug("basa: target %pI4\n", &targets[i]);
2334
2335                 /* Find out through which dev should the packet go */
2336                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2337                                      RTO_ONLINK, 0);
2338                 if (IS_ERR(rt)) {
2339                         if (net_ratelimit()) {
2340                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2341                                            bond->dev->name, &targets[i]);
2342                         }
2343                         continue;
2344                 }
2345
2346                 vlan_id = 0;
2347
2348                 /* bond device itself */
2349                 if (rt->dst.dev == bond->dev)
2350                         goto found;
2351
2352                 rcu_read_lock();
2353                 /* first we search only for vlan devices. for every vlan
2354                  * found we verify its upper dev list, searching for the
2355                  * rt->dst.dev. If found we save the tag of the vlan and
2356                  * proceed to send the packet.
2357                  *
2358                  * TODO: QinQ?
2359                  */
2360                 netdev_for_each_upper_dev_rcu(bond->dev, vlan_upper, vlan_iter) {
2361                         if (!is_vlan_dev(vlan_upper))
2362                                 continue;
2363                         netdev_for_each_upper_dev_rcu(vlan_upper, upper, iter) {
2364                                 if (upper == rt->dst.dev) {
2365                                         vlan_id = vlan_dev_vlan_id(vlan_upper);
2366                                         rcu_read_unlock();
2367                                         goto found;
2368                                 }
2369                         }
2370                 }
2371
2372                 /* if the device we're looking for is not on top of any of
2373                  * our upper vlans, then just search for any dev that
2374                  * matches, and in case it's a vlan - save the id
2375                  */
2376                 netdev_for_each_upper_dev_rcu(bond->dev, upper, iter) {
2377                         if (upper == rt->dst.dev) {
2378                                 /* if it's a vlan - get its VID */
2379                                 if (is_vlan_dev(upper))
2380                                         vlan_id = vlan_dev_vlan_id(upper);
2381
2382                                 rcu_read_unlock();
2383                                 goto found;
2384                         }
2385                 }
2386                 rcu_read_unlock();
2387
2388                 /* Not our device - skip */
2389                 if (net_ratelimit())
2390                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2391                                    bond->dev->name, &targets[i],
2392                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2393                 ip_rt_put(rt);
2394                 continue;
2395
2396 found:
2397                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2398                 ip_rt_put(rt);
2399                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2400                               addr, vlan_id);
2401         }
2402 }
2403
2404 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2405 {
2406         int i;
2407
2408         if (!sip || !bond_has_this_ip(bond, tip)) {
2409                 pr_debug("bva: sip %pI4 tip %pI4 not found\n", &sip, &tip);
2410                 return;
2411         }
2412
2413         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2414         if (i == -1) {
2415                 pr_debug("bva: sip %pI4 not found in targets\n", &sip);
2416                 return;
2417         }
2418         slave->last_arp_rx = jiffies;
2419         slave->target_last_arp_rx[i] = jiffies;
2420 }
2421
2422 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2423                         struct slave *slave)
2424 {
2425         struct arphdr *arp = (struct arphdr *)skb->data;
2426         unsigned char *arp_ptr;
2427         __be32 sip, tip;
2428         int alen;
2429
2430         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2431                 return RX_HANDLER_ANOTHER;
2432
2433         read_lock(&bond->lock);
2434
2435         if (!slave_do_arp_validate(bond, slave))
2436                 goto out_unlock;
2437
2438         alen = arp_hdr_len(bond->dev);
2439
2440         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2441                  bond->dev->name, skb->dev->name);
2442
2443         if (alen > skb_headlen(skb)) {
2444                 arp = kmalloc(alen, GFP_ATOMIC);
2445                 if (!arp)
2446                         goto out_unlock;
2447                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2448                         goto out_unlock;
2449         }
2450
2451         if (arp->ar_hln != bond->dev->addr_len ||
2452             skb->pkt_type == PACKET_OTHERHOST ||
2453             skb->pkt_type == PACKET_LOOPBACK ||
2454             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2455             arp->ar_pro != htons(ETH_P_IP) ||
2456             arp->ar_pln != 4)
2457                 goto out_unlock;
2458
2459         arp_ptr = (unsigned char *)(arp + 1);
2460         arp_ptr += bond->dev->addr_len;
2461         memcpy(&sip, arp_ptr, 4);
2462         arp_ptr += 4 + bond->dev->addr_len;
2463         memcpy(&tip, arp_ptr, 4);
2464
2465         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2466                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2467                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2468                  &sip, &tip);
2469
2470         /*
2471          * Backup slaves won't see the ARP reply, but do come through
2472          * here for each ARP probe (so we swap the sip/tip to validate
2473          * the probe).  In a "redundant switch, common router" type of
2474          * configuration, the ARP probe will (hopefully) travel from
2475          * the active, through one switch, the router, then the other
2476          * switch before reaching the backup.
2477          *
2478          * We 'trust' the arp requests if there is an active slave and
2479          * it received valid arp reply(s) after it became active. This
2480          * is done to avoid endless looping when we can't reach the
2481          * arp_ip_target and fool ourselves with our own arp requests.
2482          */
2483         if (bond_is_active_slave(slave))
2484                 bond_validate_arp(bond, slave, sip, tip);
2485         else if (bond->curr_active_slave &&
2486                  time_after(slave_last_rx(bond, bond->curr_active_slave),
2487                             bond->curr_active_slave->jiffies))
2488                 bond_validate_arp(bond, slave, tip, sip);
2489
2490 out_unlock:
2491         read_unlock(&bond->lock);
2492         if (arp != (struct arphdr *)skb->data)
2493                 kfree(arp);
2494         return RX_HANDLER_ANOTHER;
2495 }
2496
2497 /* function to verify if we're in the arp_interval timeslice, returns true if
2498  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2499  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2500  */
2501 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2502                                   int mod)
2503 {
2504         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2505
2506         return time_in_range(jiffies,
2507                              last_act - delta_in_ticks,
2508                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2509 }
2510
2511 /*
2512  * this function is called regularly to monitor each slave's link
2513  * ensuring that traffic is being sent and received when arp monitoring
2514  * is used in load-balancing mode. if the adapter has been dormant, then an
2515  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2516  * arp monitoring in active backup mode.
2517  */
2518 void bond_loadbalance_arp_mon(struct work_struct *work)
2519 {
2520         struct bonding *bond = container_of(work, struct bonding,
2521                                             arp_work.work);
2522         struct slave *slave, *oldcurrent;
2523         int do_failover = 0;
2524
2525         read_lock(&bond->lock);
2526
2527         if (list_empty(&bond->slave_list))
2528                 goto re_arm;
2529
2530         oldcurrent = bond->curr_active_slave;
2531         /* see if any of the previous devices are up now (i.e. they have
2532          * xmt and rcv traffic). the curr_active_slave does not come into
2533          * the picture unless it is null. also, slave->jiffies is not needed
2534          * here because we send an arp on each slave and give a slave as
2535          * long as it needs to get the tx/rx within the delta.
2536          * TODO: what about up/down delay in arp mode? it wasn't here before
2537          *       so it can wait
2538          */
2539         bond_for_each_slave(bond, slave) {
2540                 unsigned long trans_start = dev_trans_start(slave->dev);
2541
2542                 if (slave->link != BOND_LINK_UP) {
2543                         if (bond_time_in_interval(bond, trans_start, 1) &&
2544                             bond_time_in_interval(bond, slave->dev->last_rx, 1)) {
2545
2546                                 slave->link  = BOND_LINK_UP;
2547                                 bond_set_active_slave(slave);
2548
2549                                 /* primary_slave has no meaning in round-robin
2550                                  * mode. the window of a slave being up and
2551                                  * curr_active_slave being null after enslaving
2552                                  * is closed.
2553                                  */
2554                                 if (!oldcurrent) {
2555                                         pr_info("%s: link status definitely up for interface %s, ",
2556                                                 bond->dev->name,
2557                                                 slave->dev->name);
2558                                         do_failover = 1;
2559                                 } else {
2560                                         pr_info("%s: interface %s is now up\n",
2561                                                 bond->dev->name,
2562                                                 slave->dev->name);
2563                                 }
2564                         }
2565                 } else {
2566                         /* slave->link == BOND_LINK_UP */
2567
2568                         /* not all switches will respond to an arp request
2569                          * when the source ip is 0, so don't take the link down
2570                          * if we don't know our ip yet
2571                          */
2572                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2573                             !bond_time_in_interval(bond, slave->dev->last_rx, 2)) {
2574
2575                                 slave->link  = BOND_LINK_DOWN;
2576                                 bond_set_backup_slave(slave);
2577
2578                                 if (slave->link_failure_count < UINT_MAX)
2579                                         slave->link_failure_count++;
2580
2581                                 pr_info("%s: interface %s is now down.\n",
2582                                         bond->dev->name,
2583                                         slave->dev->name);
2584
2585                                 if (slave == oldcurrent)
2586                                         do_failover = 1;
2587                         }
2588                 }
2589
2590                 /* note: if switch is in round-robin mode, all links
2591                  * must tx arp to ensure all links rx an arp - otherwise
2592                  * links may oscillate or not come up at all; if switch is
2593                  * in something like xor mode, there is nothing we can
2594                  * do - all replies will be rx'ed on same link causing slaves
2595                  * to be unstable during low/no traffic periods
2596                  */
2597                 if (IS_UP(slave->dev))
2598                         bond_arp_send_all(bond, slave);
2599         }
2600
2601         if (do_failover) {
2602                 block_netpoll_tx();
2603                 write_lock_bh(&bond->curr_slave_lock);
2604
2605                 bond_select_active_slave(bond);
2606
2607                 write_unlock_bh(&bond->curr_slave_lock);
2608                 unblock_netpoll_tx();
2609         }
2610
2611 re_arm:
2612         if (bond->params.arp_interval)
2613                 queue_delayed_work(bond->wq, &bond->arp_work,
2614                                    msecs_to_jiffies(bond->params.arp_interval));
2615
2616         read_unlock(&bond->lock);
2617 }
2618
2619 /*
2620  * Called to inspect slaves for active-backup mode ARP monitor link state
2621  * changes.  Sets new_link in slaves to specify what action should take
2622  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2623  * to link states must be committed.
2624  *
2625  * Called with bond->lock held for read.
2626  */
2627 static int bond_ab_arp_inspect(struct bonding *bond)
2628 {
2629         unsigned long trans_start, last_rx;
2630         struct slave *slave;
2631         int commit = 0;
2632
2633         bond_for_each_slave(bond, slave) {
2634                 slave->new_link = BOND_LINK_NOCHANGE;
2635                 last_rx = slave_last_rx(bond, slave);
2636
2637                 if (slave->link != BOND_LINK_UP) {
2638                         if (bond_time_in_interval(bond, last_rx, 1)) {
2639                                 slave->new_link = BOND_LINK_UP;
2640                                 commit++;
2641                         }
2642                         continue;
2643                 }
2644
2645                 /*
2646                  * Give slaves 2*delta after being enslaved or made
2647                  * active.  This avoids bouncing, as the last receive
2648                  * times need a full ARP monitor cycle to be updated.
2649                  */
2650                 if (bond_time_in_interval(bond, slave->jiffies, 2))
2651                         continue;
2652
2653                 /*
2654                  * Backup slave is down if:
2655                  * - No current_arp_slave AND
2656                  * - more than 3*delta since last receive AND
2657                  * - the bond has an IP address
2658                  *
2659                  * Note: a non-null current_arp_slave indicates
2660                  * the curr_active_slave went down and we are
2661                  * searching for a new one; under this condition
2662                  * we only take the curr_active_slave down - this
2663                  * gives each slave a chance to tx/rx traffic
2664                  * before being taken out
2665                  */
2666                 if (!bond_is_active_slave(slave) &&
2667                     !bond->current_arp_slave &&
2668                     !bond_time_in_interval(bond, last_rx, 3)) {
2669                         slave->new_link = BOND_LINK_DOWN;
2670                         commit++;
2671                 }
2672
2673                 /*
2674                  * Active slave is down if:
2675                  * - more than 2*delta since transmitting OR
2676                  * - (more than 2*delta since receive AND
2677                  *    the bond has an IP address)
2678                  */
2679                 trans_start = dev_trans_start(slave->dev);
2680                 if (bond_is_active_slave(slave) &&
2681                     (!bond_time_in_interval(bond, trans_start, 2) ||
2682                      !bond_time_in_interval(bond, last_rx, 2))) {
2683                         slave->new_link = BOND_LINK_DOWN;
2684                         commit++;
2685                 }
2686         }
2687
2688         return commit;
2689 }
2690
2691 /*
2692  * Called to commit link state changes noted by inspection step of
2693  * active-backup mode ARP monitor.
2694  *
2695  * Called with RTNL and bond->lock for read.
2696  */
2697 static void bond_ab_arp_commit(struct bonding *bond)
2698 {
2699         unsigned long trans_start;
2700         struct slave *slave;
2701
2702         bond_for_each_slave(bond, slave) {
2703                 switch (slave->new_link) {
2704                 case BOND_LINK_NOCHANGE:
2705                         continue;
2706
2707                 case BOND_LINK_UP:
2708                         trans_start = dev_trans_start(slave->dev);
2709                         if (bond->curr_active_slave != slave ||
2710                             (!bond->curr_active_slave &&
2711                              bond_time_in_interval(bond, trans_start, 1))) {
2712                                 slave->link = BOND_LINK_UP;
2713                                 if (bond->current_arp_slave) {
2714                                         bond_set_slave_inactive_flags(
2715                                                 bond->current_arp_slave);
2716                                         bond->current_arp_slave = NULL;
2717                                 }
2718
2719                                 pr_info("%s: link status definitely up for interface %s.\n",
2720                                         bond->dev->name, slave->dev->name);
2721
2722                                 if (!bond->curr_active_slave ||
2723                                     (slave == bond->primary_slave))
2724                                         goto do_failover;
2725
2726                         }
2727
2728                         continue;
2729
2730                 case BOND_LINK_DOWN:
2731                         if (slave->link_failure_count < UINT_MAX)
2732                                 slave->link_failure_count++;
2733
2734                         slave->link = BOND_LINK_DOWN;
2735                         bond_set_slave_inactive_flags(slave);
2736
2737                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2738                                 bond->dev->name, slave->dev->name);
2739
2740                         if (slave == bond->curr_active_slave) {
2741                                 bond->current_arp_slave = NULL;
2742                                 goto do_failover;
2743                         }
2744
2745                         continue;
2746
2747                 default:
2748                         pr_err("%s: impossible: new_link %d on slave %s\n",
2749                                bond->dev->name, slave->new_link,
2750                                slave->dev->name);
2751                         continue;
2752                 }
2753
2754 do_failover:
2755                 ASSERT_RTNL();
2756                 block_netpoll_tx();
2757                 write_lock_bh(&bond->curr_slave_lock);
2758                 bond_select_active_slave(bond);
2759                 write_unlock_bh(&bond->curr_slave_lock);
2760                 unblock_netpoll_tx();
2761         }
2762
2763         bond_set_carrier(bond);
2764 }
2765
2766 /*
2767  * Send ARP probes for active-backup mode ARP monitor.
2768  *
2769  * Called with bond->lock held for read.
2770  */
2771 static void bond_ab_arp_probe(struct bonding *bond)
2772 {
2773         struct slave *slave, *next_slave;
2774         int i;
2775
2776         read_lock(&bond->curr_slave_lock);
2777
2778         if (bond->current_arp_slave && bond->curr_active_slave)
2779                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
2780                         bond->current_arp_slave->dev->name,
2781                         bond->curr_active_slave->dev->name);
2782
2783         if (bond->curr_active_slave) {
2784                 bond_arp_send_all(bond, bond->curr_active_slave);
2785                 read_unlock(&bond->curr_slave_lock);
2786                 return;
2787         }
2788
2789         read_unlock(&bond->curr_slave_lock);
2790
2791         /* if we don't have a curr_active_slave, search for the next available
2792          * backup slave from the current_arp_slave and make it the candidate
2793          * for becoming the curr_active_slave
2794          */
2795
2796         if (!bond->current_arp_slave) {
2797                 bond->current_arp_slave = bond_first_slave(bond);
2798                 if (!bond->current_arp_slave)
2799                         return;
2800         }
2801
2802         bond_set_slave_inactive_flags(bond->current_arp_slave);
2803
2804         /* search for next candidate */
2805         next_slave = bond_next_slave(bond, bond->current_arp_slave);
2806         bond_for_each_slave_from(bond, slave, i, next_slave) {
2807                 if (IS_UP(slave->dev)) {
2808                         slave->link = BOND_LINK_BACK;
2809                         bond_set_slave_active_flags(slave);
2810                         bond_arp_send_all(bond, slave);
2811                         slave->jiffies = jiffies;
2812                         bond->current_arp_slave = slave;
2813                         break;
2814                 }
2815
2816                 /* if the link state is up at this point, we
2817                  * mark it down - this can happen if we have
2818                  * simultaneous link failures and
2819                  * reselect_active_interface doesn't make this
2820                  * one the current slave so it is still marked
2821                  * up when it is actually down
2822                  */
2823                 if (slave->link == BOND_LINK_UP) {
2824                         slave->link = BOND_LINK_DOWN;
2825                         if (slave->link_failure_count < UINT_MAX)
2826                                 slave->link_failure_count++;
2827
2828                         bond_set_slave_inactive_flags(slave);
2829
2830                         pr_info("%s: backup interface %s is now down.\n",
2831                                 bond->dev->name, slave->dev->name);
2832                 }
2833         }
2834 }
2835
2836 void bond_activebackup_arp_mon(struct work_struct *work)
2837 {
2838         struct bonding *bond = container_of(work, struct bonding,
2839                                             arp_work.work);
2840         bool should_notify_peers = false;
2841         int delta_in_ticks;
2842
2843         read_lock(&bond->lock);
2844
2845         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2846
2847         if (list_empty(&bond->slave_list))
2848                 goto re_arm;
2849
2850         should_notify_peers = bond_should_notify_peers(bond);
2851
2852         if (bond_ab_arp_inspect(bond)) {
2853                 read_unlock(&bond->lock);
2854
2855                 /* Race avoidance with bond_close flush of workqueue */
2856                 if (!rtnl_trylock()) {
2857                         read_lock(&bond->lock);
2858                         delta_in_ticks = 1;
2859                         should_notify_peers = false;
2860                         goto re_arm;
2861                 }
2862
2863                 read_lock(&bond->lock);
2864
2865                 bond_ab_arp_commit(bond);
2866
2867                 read_unlock(&bond->lock);
2868                 rtnl_unlock();
2869                 read_lock(&bond->lock);
2870         }
2871
2872         bond_ab_arp_probe(bond);
2873
2874 re_arm:
2875         if (bond->params.arp_interval)
2876                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2877
2878         read_unlock(&bond->lock);
2879
2880         if (should_notify_peers) {
2881                 if (!rtnl_trylock()) {
2882                         read_lock(&bond->lock);
2883                         bond->send_peer_notif++;
2884                         read_unlock(&bond->lock);
2885                         return;
2886                 }
2887                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2888                 rtnl_unlock();
2889         }
2890 }
2891
2892 /*-------------------------- netdev event handling --------------------------*/
2893
2894 /*
2895  * Change device name
2896  */
2897 static int bond_event_changename(struct bonding *bond)
2898 {
2899         bond_remove_proc_entry(bond);
2900         bond_create_proc_entry(bond);
2901
2902         bond_debug_reregister(bond);
2903
2904         return NOTIFY_DONE;
2905 }
2906
2907 static int bond_master_netdev_event(unsigned long event,
2908                                     struct net_device *bond_dev)
2909 {
2910         struct bonding *event_bond = netdev_priv(bond_dev);
2911
2912         switch (event) {
2913         case NETDEV_CHANGENAME:
2914                 return bond_event_changename(event_bond);
2915         case NETDEV_UNREGISTER:
2916                 bond_remove_proc_entry(event_bond);
2917                 break;
2918         case NETDEV_REGISTER:
2919                 bond_create_proc_entry(event_bond);
2920                 break;
2921         default:
2922                 break;
2923         }
2924
2925         return NOTIFY_DONE;
2926 }
2927
2928 static int bond_slave_netdev_event(unsigned long event,
2929                                    struct net_device *slave_dev)
2930 {
2931         struct slave *slave = bond_slave_get_rtnl(slave_dev);
2932         struct bonding *bond;
2933         struct net_device *bond_dev;
2934         u32 old_speed;
2935         u8 old_duplex;
2936
2937         /* A netdev event can be generated while enslaving a device
2938          * before netdev_rx_handler_register is called in which case
2939          * slave will be NULL
2940          */
2941         if (!slave)
2942                 return NOTIFY_DONE;
2943         bond_dev = slave->bond->dev;
2944         bond = slave->bond;
2945
2946         switch (event) {
2947         case NETDEV_UNREGISTER:
2948                 if (bond_dev->type != ARPHRD_ETHER)
2949                         bond_release_and_destroy(bond_dev, slave_dev);
2950                 else
2951                         bond_release(bond_dev, slave_dev);
2952                 break;
2953         case NETDEV_UP:
2954         case NETDEV_CHANGE:
2955                 old_speed = slave->speed;
2956                 old_duplex = slave->duplex;
2957
2958                 bond_update_speed_duplex(slave);
2959
2960                 if (bond->params.mode == BOND_MODE_8023AD) {
2961                         if (old_speed != slave->speed)
2962                                 bond_3ad_adapter_speed_changed(slave);
2963                         if (old_duplex != slave->duplex)
2964                                 bond_3ad_adapter_duplex_changed(slave);
2965                 }
2966                 break;
2967         case NETDEV_DOWN:
2968                 /*
2969                  * ... Or is it this?
2970                  */
2971                 break;
2972         case NETDEV_CHANGEMTU:
2973                 /*
2974                  * TODO: Should slaves be allowed to
2975                  * independently alter their MTU?  For
2976                  * an active-backup bond, slaves need
2977                  * not be the same type of device, so
2978                  * MTUs may vary.  For other modes,
2979                  * slaves arguably should have the
2980                  * same MTUs. To do this, we'd need to
2981                  * take over the slave's change_mtu
2982                  * function for the duration of their
2983                  * servitude.
2984                  */
2985                 break;
2986         case NETDEV_CHANGENAME:
2987                 /*
2988                  * TODO: handle changing the primary's name
2989                  */
2990                 break;
2991         case NETDEV_FEAT_CHANGE:
2992                 bond_compute_features(bond);
2993                 break;
2994         case NETDEV_RESEND_IGMP:
2995                 /* Propagate to master device */
2996                 call_netdevice_notifiers(event, slave->bond->dev);
2997                 break;
2998         default:
2999                 break;
3000         }
3001
3002         return NOTIFY_DONE;
3003 }
3004
3005 /*
3006  * bond_netdev_event: handle netdev notifier chain events.
3007  *
3008  * This function receives events for the netdev chain.  The caller (an
3009  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3010  * locks for us to safely manipulate the slave devices (RTNL lock,
3011  * dev_probe_lock).
3012  */
3013 static int bond_netdev_event(struct notifier_block *this,
3014                              unsigned long event, void *ptr)
3015 {
3016         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3017
3018         pr_debug("event_dev: %s, event: %lx\n",
3019                  event_dev ? event_dev->name : "None",
3020                  event);
3021
3022         if (!(event_dev->priv_flags & IFF_BONDING))
3023                 return NOTIFY_DONE;
3024
3025         if (event_dev->flags & IFF_MASTER) {
3026                 pr_debug("IFF_MASTER\n");
3027                 return bond_master_netdev_event(event, event_dev);
3028         }
3029
3030         if (event_dev->flags & IFF_SLAVE) {
3031                 pr_debug("IFF_SLAVE\n");
3032                 return bond_slave_netdev_event(event, event_dev);
3033         }
3034
3035         return NOTIFY_DONE;
3036 }
3037
3038 static struct notifier_block bond_netdev_notifier = {
3039         .notifier_call = bond_netdev_event,
3040 };
3041
3042 /*---------------------------- Hashing Policies -----------------------------*/
3043
3044 /*
3045  * Hash for the output device based upon layer 2 data
3046  */
3047 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3048 {
3049         struct ethhdr *data = (struct ethhdr *)skb->data;
3050
3051         if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
3052                 return (data->h_dest[5] ^ data->h_source[5]) % count;
3053
3054         return 0;
3055 }
3056
3057 /*
3058  * Hash for the output device based upon layer 2 and layer 3 data. If
3059  * the packet is not IP, fall back on bond_xmit_hash_policy_l2()
3060  */
3061 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3062 {
3063         const struct ethhdr *data;
3064         const struct iphdr *iph;
3065         const struct ipv6hdr *ipv6h;
3066         u32 v6hash;
3067         const __be32 *s, *d;
3068
3069         if (skb->protocol == htons(ETH_P_IP) &&
3070             pskb_network_may_pull(skb, sizeof(*iph))) {
3071                 iph = ip_hdr(skb);
3072                 data = (struct ethhdr *)skb->data;
3073                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3074                         (data->h_dest[5] ^ data->h_source[5])) % count;
3075         } else if (skb->protocol == htons(ETH_P_IPV6) &&
3076                    pskb_network_may_pull(skb, sizeof(*ipv6h))) {
3077                 ipv6h = ipv6_hdr(skb);
3078                 data = (struct ethhdr *)skb->data;
3079                 s = &ipv6h->saddr.s6_addr32[0];
3080                 d = &ipv6h->daddr.s6_addr32[0];
3081                 v6hash = (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3082                 v6hash ^= (v6hash >> 24) ^ (v6hash >> 16) ^ (v6hash >> 8);
3083                 return (v6hash ^ data->h_dest[5] ^ data->h_source[5]) % count;
3084         }
3085
3086         return bond_xmit_hash_policy_l2(skb, count);
3087 }
3088
3089 /*
3090  * Hash for the output device based upon layer 3 and layer 4 data. If
3091  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3092  * altogether not IP, fall back on bond_xmit_hash_policy_l2()
3093  */
3094 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3095 {
3096         u32 layer4_xor = 0;
3097         const struct iphdr *iph;
3098         const struct ipv6hdr *ipv6h;
3099         const __be32 *s, *d;
3100         const __be16 *l4 = NULL;
3101         __be16 _l4[2];
3102         int noff = skb_network_offset(skb);
3103         int poff;
3104
3105         if (skb->protocol == htons(ETH_P_IP) &&
3106             pskb_may_pull(skb, noff + sizeof(*iph))) {
3107                 iph = ip_hdr(skb);
3108                 poff = proto_ports_offset(iph->protocol);
3109
3110                 if (!ip_is_fragment(iph) && poff >= 0) {
3111                         l4 = skb_header_pointer(skb, noff + (iph->ihl << 2) + poff,
3112                                                 sizeof(_l4), &_l4);
3113                         if (l4)
3114                                 layer4_xor = ntohs(l4[0] ^ l4[1]);
3115                 }
3116                 return (layer4_xor ^
3117                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3118         } else if (skb->protocol == htons(ETH_P_IPV6) &&
3119                    pskb_may_pull(skb, noff + sizeof(*ipv6h))) {
3120                 ipv6h = ipv6_hdr(skb);
3121                 poff = proto_ports_offset(ipv6h->nexthdr);
3122                 if (poff >= 0) {
3123                         l4 = skb_header_pointer(skb, noff + sizeof(*ipv6h) + poff,
3124                                                 sizeof(_l4), &_l4);
3125                         if (l4)
3126                                 layer4_xor = ntohs(l4[0] ^ l4[1]);
3127                 }
3128                 s = &ipv6h->saddr.s6_addr32[0];
3129                 d = &ipv6h->daddr.s6_addr32[0];
3130                 layer4_xor ^= (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3131                 layer4_xor ^= (layer4_xor >> 24) ^ (layer4_xor >> 16) ^
3132                                (layer4_xor >> 8);
3133                 return layer4_xor % count;
3134         }
3135
3136         return bond_xmit_hash_policy_l2(skb, count);
3137 }
3138
3139 /*-------------------------- Device entry points ----------------------------*/
3140
3141 static void bond_work_init_all(struct bonding *bond)
3142 {
3143         INIT_DELAYED_WORK(&bond->mcast_work,
3144                           bond_resend_igmp_join_requests_delayed);
3145         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3146         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3147         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3148                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3149         else
3150                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3151         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3152 }
3153
3154 static void bond_work_cancel_all(struct bonding *bond)
3155 {
3156         cancel_delayed_work_sync(&bond->mii_work);
3157         cancel_delayed_work_sync(&bond->arp_work);
3158         cancel_delayed_work_sync(&bond->alb_work);
3159         cancel_delayed_work_sync(&bond->ad_work);
3160         cancel_delayed_work_sync(&bond->mcast_work);
3161 }
3162
3163 static int bond_open(struct net_device *bond_dev)
3164 {
3165         struct bonding *bond = netdev_priv(bond_dev);
3166         struct slave *slave;
3167
3168         /* reset slave->backup and slave->inactive */
3169         read_lock(&bond->lock);
3170         if (!list_empty(&bond->slave_list)) {
3171                 read_lock(&bond->curr_slave_lock);
3172                 bond_for_each_slave(bond, slave) {
3173                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3174                                 && (slave != bond->curr_active_slave)) {
3175                                 bond_set_slave_inactive_flags(slave);
3176                         } else {
3177                                 bond_set_slave_active_flags(slave);
3178                         }
3179                 }
3180                 read_unlock(&bond->curr_slave_lock);
3181         }
3182         read_unlock(&bond->lock);
3183
3184         bond_work_init_all(bond);
3185
3186         if (bond_is_lb(bond)) {
3187                 /* bond_alb_initialize must be called before the timer
3188                  * is started.
3189                  */
3190                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3191                         return -ENOMEM;
3192                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3193         }
3194
3195         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3196                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3197
3198         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3199                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3200                 if (bond->params.arp_validate)
3201                         bond->recv_probe = bond_arp_rcv;
3202         }
3203
3204         if (bond->params.mode == BOND_MODE_8023AD) {
3205                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3206                 /* register to receive LACPDUs */
3207                 bond->recv_probe = bond_3ad_lacpdu_recv;
3208                 bond_3ad_initiate_agg_selection(bond, 1);
3209         }
3210
3211         return 0;
3212 }
3213
3214 static int bond_close(struct net_device *bond_dev)
3215 {
3216         struct bonding *bond = netdev_priv(bond_dev);
3217
3218         write_lock_bh(&bond->lock);
3219         bond->send_peer_notif = 0;
3220         write_unlock_bh(&bond->lock);
3221
3222         bond_work_cancel_all(bond);
3223         if (bond_is_lb(bond)) {
3224                 /* Must be called only after all
3225                  * slaves have been released
3226                  */
3227                 bond_alb_deinitialize(bond);
3228         }
3229         bond->recv_probe = NULL;
3230
3231         return 0;
3232 }
3233
3234 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3235                                                 struct rtnl_link_stats64 *stats)
3236 {
3237         struct bonding *bond = netdev_priv(bond_dev);
3238         struct rtnl_link_stats64 temp;
3239         struct slave *slave;
3240
3241         memset(stats, 0, sizeof(*stats));
3242
3243         read_lock_bh(&bond->lock);
3244         bond_for_each_slave(bond, slave) {
3245                 const struct rtnl_link_stats64 *sstats =
3246                         dev_get_stats(slave->dev, &temp);
3247
3248                 stats->rx_packets += sstats->rx_packets;
3249                 stats->rx_bytes += sstats->rx_bytes;
3250                 stats->rx_errors += sstats->rx_errors;
3251                 stats->rx_dropped += sstats->rx_dropped;
3252
3253                 stats->tx_packets += sstats->tx_packets;
3254                 stats->tx_bytes += sstats->tx_bytes;
3255                 stats->tx_errors += sstats->tx_errors;
3256                 stats->tx_dropped += sstats->tx_dropped;
3257
3258                 stats->multicast += sstats->multicast;
3259                 stats->collisions += sstats->collisions;
3260
3261                 stats->rx_length_errors += sstats->rx_length_errors;
3262                 stats->rx_over_errors += sstats->rx_over_errors;
3263                 stats->rx_crc_errors += sstats->rx_crc_errors;
3264                 stats->rx_frame_errors += sstats->rx_frame_errors;
3265                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3266                 stats->rx_missed_errors += sstats->rx_missed_errors;
3267
3268                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3269                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3270                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3271                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3272                 stats->tx_window_errors += sstats->tx_window_errors;
3273         }
3274         read_unlock_bh(&bond->lock);
3275
3276         return stats;
3277 }
3278
3279 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3280 {
3281         struct net_device *slave_dev = NULL;
3282         struct ifbond k_binfo;
3283         struct ifbond __user *u_binfo = NULL;
3284         struct ifslave k_sinfo;
3285         struct ifslave __user *u_sinfo = NULL;
3286         struct mii_ioctl_data *mii = NULL;
3287         struct net *net;
3288         int res = 0;
3289
3290         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3291
3292         switch (cmd) {
3293         case SIOCGMIIPHY:
3294                 mii = if_mii(ifr);
3295                 if (!mii)
3296                         return -EINVAL;
3297
3298                 mii->phy_id = 0;
3299                 /* Fall Through */
3300         case SIOCGMIIREG:
3301                 /*
3302                  * We do this again just in case we were called by SIOCGMIIREG
3303                  * instead of SIOCGMIIPHY.
3304                  */
3305                 mii = if_mii(ifr);
3306                 if (!mii)
3307                         return -EINVAL;
3308
3309
3310                 if (mii->reg_num == 1) {
3311                         struct bonding *bond = netdev_priv(bond_dev);
3312                         mii->val_out = 0;
3313                         read_lock(&bond->lock);
3314                         read_lock(&bond->curr_slave_lock);
3315                         if (netif_carrier_ok(bond->dev))
3316                                 mii->val_out = BMSR_LSTATUS;
3317
3318                         read_unlock(&bond->curr_slave_lock);
3319                         read_unlock(&bond->lock);
3320                 }
3321
3322                 return 0;
3323         case BOND_INFO_QUERY_OLD:
3324         case SIOCBONDINFOQUERY:
3325                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3326
3327                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3328                         return -EFAULT;
3329
3330                 res = bond_info_query(bond_dev, &k_binfo);
3331                 if (res == 0 &&
3332                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3333                         return -EFAULT;
3334
3335                 return res;
3336         case BOND_SLAVE_INFO_QUERY_OLD:
3337         case SIOCBONDSLAVEINFOQUERY:
3338                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3339
3340                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3341                         return -EFAULT;
3342
3343                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3344                 if (res == 0 &&
3345                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3346                         return -EFAULT;
3347
3348                 return res;
3349         default:
3350                 /* Go on */
3351                 break;
3352         }
3353
3354         net = dev_net(bond_dev);
3355
3356         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3357                 return -EPERM;
3358
3359         slave_dev = dev_get_by_name(net, ifr->ifr_slave);
3360
3361         pr_debug("slave_dev=%p:\n", slave_dev);
3362
3363         if (!slave_dev)
3364                 res = -ENODEV;
3365         else {
3366                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3367                 switch (cmd) {
3368                 case BOND_ENSLAVE_OLD:
3369                 case SIOCBONDENSLAVE:
3370                         res = bond_enslave(bond_dev, slave_dev);
3371                         break;
3372                 case BOND_RELEASE_OLD:
3373                 case SIOCBONDRELEASE:
3374                         res = bond_release(bond_dev, slave_dev);
3375                         break;
3376                 case BOND_SETHWADDR_OLD:
3377                 case SIOCBONDSETHWADDR:
3378                         bond_set_dev_addr(bond_dev, slave_dev);
3379                         res = 0;
3380                         break;
3381                 case BOND_CHANGE_ACTIVE_OLD:
3382                 case SIOCBONDCHANGEACTIVE:
3383                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3384                         break;
3385                 default:
3386                         res = -EOPNOTSUPP;
3387                 }
3388
3389                 dev_put(slave_dev);
3390         }
3391
3392         return res;
3393 }
3394
3395 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3396 {
3397         struct bonding *bond = netdev_priv(bond_dev);
3398
3399         if (change & IFF_PROMISC)
3400                 bond_set_promiscuity(bond,
3401                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3402
3403         if (change & IFF_ALLMULTI)
3404                 bond_set_allmulti(bond,
3405                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3406 }
3407
3408 static void bond_set_rx_mode(struct net_device *bond_dev)
3409 {
3410         struct bonding *bond = netdev_priv(bond_dev);
3411         struct slave *slave;
3412
3413         ASSERT_RTNL();
3414
3415         if (USES_PRIMARY(bond->params.mode)) {
3416                 slave = rtnl_dereference(bond->curr_active_slave);
3417                 if (slave) {
3418                         dev_uc_sync(slave->dev, bond_dev);
3419                         dev_mc_sync(slave->dev, bond_dev);
3420                 }
3421         } else {
3422                 bond_for_each_slave(bond, slave) {
3423                         dev_uc_sync_multiple(slave->dev, bond_dev);
3424                         dev_mc_sync_multiple(slave->dev, bond_dev);
3425                 }
3426         }
3427 }
3428
3429 static int bond_neigh_init(struct neighbour *n)
3430 {
3431         struct bonding *bond = netdev_priv(n->dev);
3432         const struct net_device_ops *slave_ops;
3433         struct neigh_parms parms;
3434         struct slave *slave;
3435         int ret;
3436
3437         slave = bond_first_slave(bond);
3438         if (!slave)
3439                 return 0;
3440         slave_ops = slave->dev->netdev_ops;
3441         if (!slave_ops->ndo_neigh_setup)
3442                 return 0;
3443
3444         parms.neigh_setup = NULL;
3445         parms.neigh_cleanup = NULL;
3446         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3447         if (ret)
3448                 return ret;
3449
3450         /*
3451          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3452          * after the last slave has been detached.  Assumes that all slaves
3453          * utilize the same neigh_cleanup (true at this writing as only user
3454          * is ipoib).
3455          */
3456         n->parms->neigh_cleanup = parms.neigh_cleanup;
3457
3458         if (!parms.neigh_setup)
3459                 return 0;
3460
3461         return parms.neigh_setup(n);
3462 }
3463
3464 /*
3465  * The bonding ndo_neigh_setup is called at init time beofre any
3466  * slave exists. So we must declare proxy setup function which will
3467  * be used at run time to resolve the actual slave neigh param setup.
3468  *
3469  * It's also called by master devices (such as vlans) to setup their
3470  * underlying devices. In that case - do nothing, we're already set up from
3471  * our init.
3472  */
3473 static int bond_neigh_setup(struct net_device *dev,
3474                             struct neigh_parms *parms)
3475 {
3476         /* modify only our neigh_parms */
3477         if (parms->dev == dev)
3478                 parms->neigh_setup = bond_neigh_init;
3479
3480         return 0;
3481 }
3482
3483 /*
3484  * Change the MTU of all of a master's slaves to match the master
3485  */
3486 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3487 {
3488         struct bonding *bond = netdev_priv(bond_dev);
3489         struct slave *slave;
3490         int res = 0;
3491
3492         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3493                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3494
3495         /* Can't hold bond->lock with bh disabled here since
3496          * some base drivers panic. On the other hand we can't
3497          * hold bond->lock without bh disabled because we'll
3498          * deadlock. The only solution is to rely on the fact
3499          * that we're under rtnl_lock here, and the slaves
3500          * list won't change. This doesn't solve the problem
3501          * of setting the slave's MTU while it is
3502          * transmitting, but the assumption is that the base
3503          * driver can handle that.
3504          *
3505          * TODO: figure out a way to safely iterate the slaves
3506          * list, but without holding a lock around the actual
3507          * call to the base driver.
3508          */
3509
3510         bond_for_each_slave(bond, slave) {
3511                 pr_debug("s %p s->p %p c_m %p\n",
3512                          slave,
3513                          bond_prev_slave(bond, slave),
3514                          slave->dev->netdev_ops->ndo_change_mtu);
3515
3516                 res = dev_set_mtu(slave->dev, new_mtu);
3517
3518                 if (res) {
3519                         /* If we failed to set the slave's mtu to the new value
3520                          * we must abort the operation even in ACTIVE_BACKUP
3521                          * mode, because if we allow the backup slaves to have
3522                          * different mtu values than the active slave we'll
3523                          * need to change their mtu when doing a failover. That
3524                          * means changing their mtu from timer context, which
3525                          * is probably not a good idea.
3526                          */
3527                         pr_debug("err %d %s\n", res, slave->dev->name);
3528                         goto unwind;
3529                 }
3530         }
3531
3532         bond_dev->mtu = new_mtu;
3533
3534         return 0;
3535
3536 unwind:
3537         /* unwind from head to the slave that failed */
3538         bond_for_each_slave_continue_reverse(bond, slave) {
3539                 int tmp_res;
3540
3541                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3542                 if (tmp_res) {
3543                         pr_debug("unwind err %d dev %s\n",
3544                                  tmp_res, slave->dev->name);
3545                 }
3546         }
3547
3548         return res;
3549 }
3550
3551 /*
3552  * Change HW address
3553  *
3554  * Note that many devices must be down to change the HW address, and
3555  * downing the master releases all slaves.  We can make bonds full of
3556  * bonding devices to test this, however.
3557  */
3558 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3559 {
3560         struct bonding *bond = netdev_priv(bond_dev);
3561         struct sockaddr *sa = addr, tmp_sa;
3562         struct slave *slave;
3563         int res = 0;
3564
3565         if (bond->params.mode == BOND_MODE_ALB)
3566                 return bond_alb_set_mac_address(bond_dev, addr);
3567
3568
3569         pr_debug("bond=%p, name=%s\n",
3570                  bond, bond_dev ? bond_dev->name : "None");
3571
3572         /* If fail_over_mac is enabled, do nothing and return success.
3573          * Returning an error causes ifenslave to fail.
3574          */
3575         if (bond->params.fail_over_mac)
3576                 return 0;
3577
3578         if (!is_valid_ether_addr(sa->sa_data))
3579                 return -EADDRNOTAVAIL;
3580
3581         /* Can't hold bond->lock with bh disabled here since
3582          * some base drivers panic. On the other hand we can't
3583          * hold bond->lock without bh disabled because we'll
3584          * deadlock. The only solution is to rely on the fact
3585          * that we're under rtnl_lock here, and the slaves
3586          * list won't change. This doesn't solve the problem
3587          * of setting the slave's hw address while it is
3588          * transmitting, but the assumption is that the base
3589          * driver can handle that.
3590          *
3591          * TODO: figure out a way to safely iterate the slaves
3592          * list, but without holding a lock around the actual
3593          * call to the base driver.
3594          */
3595
3596         bond_for_each_slave(bond, slave) {
3597                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3598                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3599
3600                 if (slave_ops->ndo_set_mac_address == NULL) {
3601                         res = -EOPNOTSUPP;
3602                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3603                         goto unwind;
3604                 }
3605
3606                 res = dev_set_mac_address(slave->dev, addr);
3607                 if (res) {
3608                         /* TODO: consider downing the slave
3609                          * and retry ?
3610                          * User should expect communications
3611                          * breakage anyway until ARP finish
3612                          * updating, so...
3613                          */
3614                         pr_debug("err %d %s\n", res, slave->dev->name);
3615                         goto unwind;
3616                 }
3617         }
3618
3619         /* success */
3620         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3621         return 0;
3622
3623 unwind:
3624         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3625         tmp_sa.sa_family = bond_dev->type;
3626
3627         /* unwind from head to the slave that failed */
3628         bond_for_each_slave_continue_reverse(bond, slave) {
3629                 int tmp_res;
3630
3631                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3632                 if (tmp_res) {
3633                         pr_debug("unwind err %d dev %s\n",
3634                                  tmp_res, slave->dev->name);
3635                 }
3636         }
3637
3638         return res;
3639 }
3640
3641 /**
3642  * bond_xmit_slave_id - transmit skb through slave with slave_id
3643  * @bond: bonding device that is transmitting
3644  * @skb: buffer to transmit
3645  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3646  *
3647  * This function tries to transmit through slave with slave_id but in case
3648  * it fails, it tries to find the first available slave for transmission.
3649  * The skb is consumed in all cases, thus the function is void.
3650  */
3651 void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3652 {
3653         struct slave *slave;
3654         int i = slave_id;
3655
3656         /* Here we start from the slave with slave_id */
3657         bond_for_each_slave_rcu(bond, slave) {
3658                 if (--i < 0) {
3659                         if (slave_can_tx(slave)) {
3660                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3661                                 return;
3662                         }
3663                 }
3664         }
3665
3666         /* Here we start from the first slave up to slave_id */
3667         i = slave_id;
3668         bond_for_each_slave_rcu(bond, slave) {
3669                 if (--i < 0)
3670                         break;
3671                 if (slave_can_tx(slave)) {
3672                         bond_dev_queue_xmit(bond, skb, slave->dev);
3673                         return;
3674                 }
3675         }
3676         /* no slave that can tx has been found */
3677         kfree_skb(skb);
3678 }
3679
3680 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3681 {
3682         struct bonding *bond = netdev_priv(bond_dev);
3683         struct iphdr *iph = ip_hdr(skb);
3684         struct slave *slave;
3685
3686         /*
3687          * Start with the curr_active_slave that joined the bond as the
3688          * default for sending IGMP traffic.  For failover purposes one
3689          * needs to maintain some consistency for the interface that will
3690          * send the join/membership reports.  The curr_active_slave found
3691          * will send all of this type of traffic.
3692          */
3693         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3694                 slave = rcu_dereference(bond->curr_active_slave);
3695                 if (slave && slave_can_tx(slave))
3696                         bond_dev_queue_xmit(bond, skb, slave->dev);
3697                 else
3698                         bond_xmit_slave_id(bond, skb, 0);
3699         } else {
3700                 bond_xmit_slave_id(bond, skb,
3701                                    bond->rr_tx_counter++ % bond->slave_cnt);
3702         }
3703
3704         return NETDEV_TX_OK;
3705 }
3706
3707 /*
3708  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3709  * the bond has a usable interface.
3710  */
3711 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3712 {
3713         struct bonding *bond = netdev_priv(bond_dev);
3714         struct slave *slave;
3715
3716         slave = rcu_dereference(bond->curr_active_slave);
3717         if (slave)
3718                 bond_dev_queue_xmit(bond, skb, slave->dev);
3719         else
3720                 kfree_skb(skb);
3721
3722         return NETDEV_TX_OK;
3723 }
3724
3725 /*
3726  * In bond_xmit_xor() , we determine the output device by using a pre-
3727  * determined xmit_hash_policy(), If the selected device is not enabled,
3728  * find the next active slave.
3729  */
3730 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3731 {
3732         struct bonding *bond = netdev_priv(bond_dev);
3733
3734         bond_xmit_slave_id(bond, skb,
3735                            bond->xmit_hash_policy(skb, bond->slave_cnt));
3736
3737         return NETDEV_TX_OK;
3738 }
3739
3740 /* in broadcast mode, we send everything to all usable interfaces. */
3741 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3742 {
3743         struct bonding *bond = netdev_priv(bond_dev);
3744         struct slave *slave = NULL;
3745
3746         bond_for_each_slave_rcu(bond, slave) {
3747                 if (bond_is_last_slave(bond, slave))
3748                         break;
3749                 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
3750                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3751
3752                         if (!skb2) {
3753                                 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
3754                                        bond_dev->name);
3755                                 continue;
3756                         }
3757                         /* bond_dev_queue_xmit always returns 0 */
3758                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3759                 }
3760         }
3761         if (slave && IS_UP(slave->dev) && slave->link == BOND_LINK_UP)
3762                 bond_dev_queue_xmit(bond, skb, slave->dev);
3763         else
3764                 kfree_skb(skb);
3765
3766         return NETDEV_TX_OK;
3767 }
3768
3769 /*------------------------- Device initialization ---------------------------*/
3770
3771 static void bond_set_xmit_hash_policy(struct bonding *bond)
3772 {
3773         switch (bond->params.xmit_policy) {
3774         case BOND_XMIT_POLICY_LAYER23:
3775                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
3776                 break;
3777         case BOND_XMIT_POLICY_LAYER34:
3778                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
3779                 break;
3780         case BOND_XMIT_POLICY_LAYER2:
3781         default:
3782                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
3783                 break;
3784         }
3785 }
3786
3787 /*
3788  * Lookup the slave that corresponds to a qid
3789  */
3790 static inline int bond_slave_override(struct bonding *bond,
3791                                       struct sk_buff *skb)
3792 {
3793         struct slave *slave = NULL;
3794         struct slave *check_slave;
3795         int res = 1;
3796
3797         if (!skb->queue_mapping)
3798                 return 1;
3799
3800         /* Find out if any slaves have the same mapping as this skb. */
3801         bond_for_each_slave_rcu(bond, check_slave) {
3802                 if (check_slave->queue_id == skb->queue_mapping) {
3803                         slave = check_slave;
3804                         break;
3805                 }
3806         }
3807
3808         /* If the slave isn't UP, use default transmit policy. */
3809         if (slave && slave->queue_id && IS_UP(slave->dev) &&
3810             (slave->link == BOND_LINK_UP)) {
3811                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3812         }
3813
3814         return res;
3815 }
3816
3817
3818 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
3819 {
3820         /*
3821          * This helper function exists to help dev_pick_tx get the correct
3822          * destination queue.  Using a helper function skips a call to
3823          * skb_tx_hash and will put the skbs in the queue we expect on their
3824          * way down to the bonding driver.
3825          */
3826         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3827
3828         /*
3829          * Save the original txq to restore before passing to the driver
3830          */
3831         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3832
3833         if (unlikely(txq >= dev->real_num_tx_queues)) {
3834                 do {
3835                         txq -= dev->real_num_tx_queues;
3836                 } while (txq >= dev->real_num_tx_queues);
3837         }
3838         return txq;
3839 }
3840
3841 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3842 {
3843         struct bonding *bond = netdev_priv(dev);
3844
3845         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
3846                 if (!bond_slave_override(bond, skb))
3847                         return NETDEV_TX_OK;
3848         }
3849
3850         switch (bond->params.mode) {
3851         case BOND_MODE_ROUNDROBIN:
3852                 return bond_xmit_roundrobin(skb, dev);
3853         case BOND_MODE_ACTIVEBACKUP:
3854                 return bond_xmit_activebackup(skb, dev);
3855         case BOND_MODE_XOR:
3856                 return bond_xmit_xor(skb, dev);
3857         case BOND_MODE_BROADCAST:
3858                 return bond_xmit_broadcast(skb, dev);
3859         case BOND_MODE_8023AD:
3860                 return bond_3ad_xmit_xor(skb, dev);
3861         case BOND_MODE_ALB:
3862         case BOND_MODE_TLB:
3863                 return bond_alb_xmit(skb, dev);
3864         default:
3865                 /* Should never happen, mode already checked */
3866                 pr_err("%s: Error: Unknown bonding mode %d\n",
3867                        dev->name, bond->params.mode);
3868                 WARN_ON_ONCE(1);
3869                 kfree_skb(skb);
3870                 return NETDEV_TX_OK;
3871         }
3872 }
3873
3874 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3875 {
3876         struct bonding *bond = netdev_priv(dev);
3877         netdev_tx_t ret = NETDEV_TX_OK;
3878
3879         /*
3880          * If we risk deadlock from transmitting this in the
3881          * netpoll path, tell netpoll to queue the frame for later tx
3882          */
3883         if (is_netpoll_tx_blocked(dev))
3884                 return NETDEV_TX_BUSY;
3885
3886         rcu_read_lock();
3887         if (!list_empty(&bond->slave_list))
3888                 ret = __bond_start_xmit(skb, dev);
3889         else
3890                 kfree_skb(skb);
3891         rcu_read_unlock();
3892
3893         return ret;
3894 }
3895
3896 /*
3897  * set bond mode specific net device operations
3898  */
3899 void bond_set_mode_ops(struct bonding *bond, int mode)
3900 {
3901         struct net_device *bond_dev = bond->dev;
3902
3903         switch (mode) {
3904         case BOND_MODE_ROUNDROBIN:
3905                 break;
3906         case BOND_MODE_ACTIVEBACKUP:
3907                 break;
3908         case BOND_MODE_XOR:
3909                 bond_set_xmit_hash_policy(bond);
3910                 break;
3911         case BOND_MODE_BROADCAST:
3912                 break;
3913         case BOND_MODE_8023AD:
3914                 bond_set_xmit_hash_policy(bond);
3915                 break;
3916         case BOND_MODE_ALB:
3917                 /* FALLTHRU */
3918         case BOND_MODE_TLB:
3919                 break;
3920         default:
3921                 /* Should never happen, mode already checked */
3922                 pr_err("%s: Error: Unknown bonding mode %d\n",
3923                        bond_dev->name, mode);
3924                 break;
3925         }
3926 }
3927
3928 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3929                                      struct ethtool_cmd *ecmd)
3930 {
3931         struct bonding *bond = netdev_priv(bond_dev);
3932         unsigned long speed = 0;
3933         struct slave *slave;
3934
3935         ecmd->duplex = DUPLEX_UNKNOWN;
3936         ecmd->port = PORT_OTHER;
3937
3938         /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
3939          * do not need to check mode.  Though link speed might not represent
3940          * the true receive or transmit bandwidth (not all modes are symmetric)
3941          * this is an accurate maximum.
3942          */
3943         read_lock(&bond->lock);
3944         bond_for_each_slave(bond, slave) {
3945                 if (SLAVE_IS_OK(slave)) {
3946                         if (slave->speed != SPEED_UNKNOWN)
3947                                 speed += slave->speed;
3948                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
3949                             slave->duplex != DUPLEX_UNKNOWN)
3950                                 ecmd->duplex = slave->duplex;
3951                 }
3952         }
3953         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3954         read_unlock(&bond->lock);
3955
3956         return 0;
3957 }
3958
3959 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3960                                      struct ethtool_drvinfo *drvinfo)
3961 {
3962         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3963         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3964         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3965                  BOND_ABI_VERSION);
3966 }
3967
3968 static const struct ethtool_ops bond_ethtool_ops = {
3969         .get_drvinfo            = bond_ethtool_get_drvinfo,
3970         .get_settings           = bond_ethtool_get_settings,
3971         .get_link               = ethtool_op_get_link,
3972 };
3973
3974 static const struct net_device_ops bond_netdev_ops = {
3975         .ndo_init               = bond_init,
3976         .ndo_uninit             = bond_uninit,
3977         .ndo_open               = bond_open,
3978         .ndo_stop               = bond_close,
3979         .ndo_start_xmit         = bond_start_xmit,
3980         .ndo_select_queue       = bond_select_queue,
3981         .ndo_get_stats64        = bond_get_stats,
3982         .ndo_do_ioctl           = bond_do_ioctl,
3983         .ndo_change_rx_flags    = bond_change_rx_flags,
3984         .ndo_set_rx_mode        = bond_set_rx_mode,
3985         .ndo_change_mtu         = bond_change_mtu,
3986         .ndo_set_mac_address    = bond_set_mac_address,
3987         .ndo_neigh_setup        = bond_neigh_setup,
3988         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
3989         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
3990 #ifdef CONFIG_NET_POLL_CONTROLLER
3991         .ndo_netpoll_setup      = bond_netpoll_setup,
3992         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
3993         .ndo_poll_controller    = bond_poll_controller,
3994 #endif
3995         .ndo_add_slave          = bond_enslave,
3996         .ndo_del_slave          = bond_release,
3997         .ndo_fix_features       = bond_fix_features,
3998 };
3999
4000 static const struct device_type bond_type = {
4001         .name = "bond",
4002 };
4003
4004 static void bond_destructor(struct net_device *bond_dev)
4005 {
4006         struct bonding *bond = netdev_priv(bond_dev);
4007         if (bond->wq)
4008                 destroy_workqueue(bond->wq);
4009         free_netdev(bond_dev);
4010 }
4011
4012 static void bond_setup(struct net_device *bond_dev)
4013 {
4014         struct bonding *bond = netdev_priv(bond_dev);
4015
4016         /* initialize rwlocks */
4017         rwlock_init(&bond->lock);
4018         rwlock_init(&bond->curr_slave_lock);
4019         INIT_LIST_HEAD(&bond->slave_list);
4020         bond->params = bonding_defaults;
4021
4022         /* Initialize pointers */
4023         bond->dev = bond_dev;
4024
4025         /* Initialize the device entry points */
4026         ether_setup(bond_dev);
4027         bond_dev->netdev_ops = &bond_netdev_ops;
4028         bond_dev->ethtool_ops = &bond_ethtool_ops;
4029         bond_set_mode_ops(bond, bond->params.mode);
4030
4031         bond_dev->destructor = bond_destructor;
4032
4033         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4034
4035         /* Initialize the device options */
4036         bond_dev->tx_queue_len = 0;
4037         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4038         bond_dev->priv_flags |= IFF_BONDING;
4039         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4040
4041         /* At first, we block adding VLANs. That's the only way to
4042          * prevent problems that occur when adding VLANs over an
4043          * empty bond. The block will be removed once non-challenged
4044          * slaves are enslaved.
4045          */
4046         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4047
4048         /* don't acquire bond device's netif_tx_lock when
4049          * transmitting */
4050         bond_dev->features |= NETIF_F_LLTX;
4051
4052         /* By default, we declare the bond to be fully
4053          * VLAN hardware accelerated capable. Special
4054          * care is taken in the various xmit functions
4055          * when there are slaves that are not hw accel
4056          * capable
4057          */
4058
4059         bond_dev->hw_features = BOND_VLAN_FEATURES |
4060                                 NETIF_F_HW_VLAN_CTAG_TX |
4061                                 NETIF_F_HW_VLAN_CTAG_RX |
4062                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4063
4064         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4065         bond_dev->features |= bond_dev->hw_features;
4066 }
4067
4068 /*
4069 * Destroy a bonding device.
4070 * Must be under rtnl_lock when this function is called.
4071 */
4072 static void bond_uninit(struct net_device *bond_dev)
4073 {
4074         struct bonding *bond = netdev_priv(bond_dev);
4075         struct slave *slave, *tmp_slave;
4076
4077         bond_netpoll_cleanup(bond_dev);
4078
4079         /* Release the bonded slaves */
4080         list_for_each_entry_safe(slave, tmp_slave, &bond->slave_list, list)
4081                 __bond_release_one(bond_dev, slave->dev, true);
4082         pr_info("%s: released all slaves\n", bond_dev->name);
4083
4084         list_del(&bond->bond_list);
4085
4086         bond_debug_unregister(bond);
4087 }
4088
4089 /*------------------------- Module initialization ---------------------------*/
4090
4091 /*
4092  * Convert string input module parms.  Accept either the
4093  * number of the mode or its string name.  A bit complicated because
4094  * some mode names are substrings of other names, and calls from sysfs
4095  * may have whitespace in the name (trailing newlines, for example).
4096  */
4097 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4098 {
4099         int modeint = -1, i, rv;
4100         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4101
4102         for (p = (char *)buf; *p; p++)
4103                 if (!(isdigit(*p) || isspace(*p)))
4104                         break;
4105
4106         if (*p)
4107                 rv = sscanf(buf, "%20s", modestr);
4108         else
4109                 rv = sscanf(buf, "%d", &modeint);
4110
4111         if (!rv)
4112                 return -1;
4113
4114         for (i = 0; tbl[i].modename; i++) {
4115                 if (modeint == tbl[i].mode)
4116                         return tbl[i].mode;
4117                 if (strcmp(modestr, tbl[i].modename) == 0)
4118                         return tbl[i].mode;
4119         }
4120
4121         return -1;
4122 }
4123
4124 static int bond_check_params(struct bond_params *params)
4125 {
4126         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4127         int arp_all_targets_value;
4128
4129         /*
4130          * Convert string parameters.
4131          */
4132         if (mode) {
4133                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4134                 if (bond_mode == -1) {
4135                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4136                                mode == NULL ? "NULL" : mode);
4137                         return -EINVAL;
4138                 }
4139         }
4140
4141         if (xmit_hash_policy) {
4142                 if ((bond_mode != BOND_MODE_XOR) &&
4143                     (bond_mode != BOND_MODE_8023AD)) {
4144                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4145                                bond_mode_name(bond_mode));
4146                 } else {
4147                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4148                                                         xmit_hashtype_tbl);
4149                         if (xmit_hashtype == -1) {
4150                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4151                                        xmit_hash_policy == NULL ? "NULL" :
4152                                        xmit_hash_policy);
4153                                 return -EINVAL;
4154                         }
4155                 }
4156         }
4157
4158         if (lacp_rate) {
4159                 if (bond_mode != BOND_MODE_8023AD) {
4160                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4161                                 bond_mode_name(bond_mode));
4162                 } else {
4163                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4164                         if (lacp_fast == -1) {
4165                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4166                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4167                                 return -EINVAL;
4168                         }
4169                 }
4170         }
4171
4172         if (ad_select) {
4173                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4174                 if (params->ad_select == -1) {
4175                         pr_err("Error: Invalid ad_select \"%s\"\n",
4176                                ad_select == NULL ? "NULL" : ad_select);
4177                         return -EINVAL;
4178                 }
4179
4180                 if (bond_mode != BOND_MODE_8023AD) {
4181                         pr_warning("ad_select param only affects 802.3ad mode\n");
4182                 }
4183         } else {
4184                 params->ad_select = BOND_AD_STABLE;
4185         }
4186
4187         if (max_bonds < 0) {
4188                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4189                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4190                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4191         }
4192
4193         if (miimon < 0) {
4194                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4195                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4196                 miimon = BOND_LINK_MON_INTERV;
4197         }
4198
4199         if (updelay < 0) {
4200                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4201                            updelay, INT_MAX);
4202                 updelay = 0;
4203         }
4204
4205         if (downdelay < 0) {
4206                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4207                            downdelay, INT_MAX);
4208                 downdelay = 0;
4209         }
4210
4211         if ((use_carrier != 0) && (use_carrier != 1)) {
4212                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4213                            use_carrier);
4214                 use_carrier = 1;
4215         }
4216
4217         if (num_peer_notif < 0 || num_peer_notif > 255) {
4218                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4219                            num_peer_notif);
4220                 num_peer_notif = 1;
4221         }
4222
4223         /* reset values for 802.3ad */
4224         if (bond_mode == BOND_MODE_8023AD) {
4225                 if (!miimon) {
4226                         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");
4227                         pr_warning("Forcing miimon to 100msec\n");
4228                         miimon = 100;
4229                 }
4230         }
4231
4232         if (tx_queues < 1 || tx_queues > 255) {
4233                 pr_warning("Warning: tx_queues (%d) should be between "
4234                            "1 and 255, resetting to %d\n",
4235                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4236                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4237         }
4238
4239         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4240                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4241                            "not of valid value (0/1), so it was set to "
4242                            "0\n", all_slaves_active);
4243                 all_slaves_active = 0;
4244         }
4245
4246         if (resend_igmp < 0 || resend_igmp > 255) {
4247                 pr_warning("Warning: resend_igmp (%d) should be between "
4248                            "0 and 255, resetting to %d\n",
4249                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4250                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4251         }
4252
4253         /* reset values for TLB/ALB */
4254         if ((bond_mode == BOND_MODE_TLB) ||
4255             (bond_mode == BOND_MODE_ALB)) {
4256                 if (!miimon) {
4257                         pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure and link speed which are essential for TLB/ALB load balancing\n");
4258                         pr_warning("Forcing miimon to 100msec\n");
4259                         miimon = 100;
4260                 }
4261         }
4262
4263         if (bond_mode == BOND_MODE_ALB) {
4264                 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",
4265                           updelay);
4266         }
4267
4268         if (!miimon) {
4269                 if (updelay || downdelay) {
4270                         /* just warn the user the up/down delay will have
4271                          * no effect since miimon is zero...
4272                          */
4273                         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",
4274                                    updelay, downdelay);
4275                 }
4276         } else {
4277                 /* don't allow arp monitoring */
4278                 if (arp_interval) {
4279                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4280                                    miimon, arp_interval);
4281                         arp_interval = 0;
4282                 }
4283
4284                 if ((updelay % miimon) != 0) {
4285                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4286                                    updelay, miimon,
4287                                    (updelay / miimon) * miimon);
4288                 }
4289
4290                 updelay /= miimon;
4291
4292                 if ((downdelay % miimon) != 0) {
4293                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4294                                    downdelay, miimon,
4295                                    (downdelay / miimon) * miimon);
4296                 }
4297
4298                 downdelay /= miimon;
4299         }
4300
4301         if (arp_interval < 0) {
4302                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4303                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4304                 arp_interval = BOND_LINK_ARP_INTERV;
4305         }
4306
4307         for (arp_ip_count = 0, i = 0;
4308              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4309                 /* not complete check, but should be good enough to
4310                    catch mistakes */
4311                 __be32 ip = in_aton(arp_ip_target[i]);
4312                 if (!isdigit(arp_ip_target[i][0]) || ip == 0 ||
4313                     ip == htonl(INADDR_BROADCAST)) {
4314                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4315                                    arp_ip_target[i]);
4316                         arp_interval = 0;
4317                 } else {
4318                         if (bond_get_targets_ip(arp_target, ip) == -1)
4319                                 arp_target[arp_ip_count++] = ip;
4320                         else
4321                                 pr_warning("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4322                                            &ip);
4323                 }
4324         }
4325
4326         if (arp_interval && !arp_ip_count) {
4327                 /* don't allow arping if no arp_ip_target given... */
4328                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4329                            arp_interval);
4330                 arp_interval = 0;
4331         }
4332
4333         if (arp_validate) {
4334                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4335                         pr_err("arp_validate only supported in active-backup mode\n");
4336                         return -EINVAL;
4337                 }
4338                 if (!arp_interval) {
4339                         pr_err("arp_validate requires arp_interval\n");
4340                         return -EINVAL;
4341                 }
4342
4343                 arp_validate_value = bond_parse_parm(arp_validate,
4344                                                      arp_validate_tbl);
4345                 if (arp_validate_value == -1) {
4346                         pr_err("Error: invalid arp_validate \"%s\"\n",
4347                                arp_validate == NULL ? "NULL" : arp_validate);
4348                         return -EINVAL;
4349                 }
4350         } else
4351                 arp_validate_value = 0;
4352
4353         arp_all_targets_value = 0;
4354         if (arp_all_targets) {
4355                 arp_all_targets_value = bond_parse_parm(arp_all_targets,
4356                                                         arp_all_targets_tbl);
4357
4358                 if (arp_all_targets_value == -1) {
4359                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4360                                arp_all_targets);
4361                         arp_all_targets_value = 0;
4362                 }
4363         }
4364
4365         if (miimon) {
4366                 pr_info("MII link monitoring set to %d ms\n", miimon);
4367         } else if (arp_interval) {
4368                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4369                         arp_interval,
4370                         arp_validate_tbl[arp_validate_value].modename,
4371                         arp_ip_count);
4372
4373                 for (i = 0; i < arp_ip_count; i++)
4374                         pr_info(" %s", arp_ip_target[i]);
4375
4376                 pr_info("\n");
4377
4378         } else if (max_bonds) {
4379                 /* miimon and arp_interval not set, we need one so things
4380                  * work as expected, see bonding.txt for details
4381                  */
4382                 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");
4383         }
4384
4385         if (primary && !USES_PRIMARY(bond_mode)) {
4386                 /* currently, using a primary only makes sense
4387                  * in active backup, TLB or ALB modes
4388                  */
4389                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4390                            primary, bond_mode_name(bond_mode));
4391                 primary = NULL;
4392         }
4393
4394         if (primary && primary_reselect) {
4395                 primary_reselect_value = bond_parse_parm(primary_reselect,
4396                                                          pri_reselect_tbl);
4397                 if (primary_reselect_value == -1) {
4398                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4399                                primary_reselect ==
4400                                         NULL ? "NULL" : primary_reselect);
4401                         return -EINVAL;
4402                 }
4403         } else {
4404                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4405         }
4406
4407         if (fail_over_mac) {
4408                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4409                                                       fail_over_mac_tbl);
4410                 if (fail_over_mac_value == -1) {
4411                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4412                                arp_validate == NULL ? "NULL" : arp_validate);
4413                         return -EINVAL;
4414                 }
4415
4416                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4417                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4418         } else {
4419                 fail_over_mac_value = BOND_FOM_NONE;
4420         }
4421
4422         /* fill params struct with the proper values */
4423         params->mode = bond_mode;
4424         params->xmit_policy = xmit_hashtype;
4425         params->miimon = miimon;
4426         params->num_peer_notif = num_peer_notif;
4427         params->arp_interval = arp_interval;
4428         params->arp_validate = arp_validate_value;
4429         params->arp_all_targets = arp_all_targets_value;
4430         params->updelay = updelay;
4431         params->downdelay = downdelay;
4432         params->use_carrier = use_carrier;
4433         params->lacp_fast = lacp_fast;
4434         params->primary[0] = 0;
4435         params->primary_reselect = primary_reselect_value;
4436         params->fail_over_mac = fail_over_mac_value;
4437         params->tx_queues = tx_queues;
4438         params->all_slaves_active = all_slaves_active;
4439         params->resend_igmp = resend_igmp;
4440         params->min_links = min_links;
4441
4442         if (primary) {
4443                 strncpy(params->primary, primary, IFNAMSIZ);
4444                 params->primary[IFNAMSIZ - 1] = 0;
4445         }
4446
4447         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4448
4449         return 0;
4450 }
4451
4452 static struct lock_class_key bonding_netdev_xmit_lock_key;
4453 static struct lock_class_key bonding_netdev_addr_lock_key;
4454 static struct lock_class_key bonding_tx_busylock_key;
4455
4456 static void bond_set_lockdep_class_one(struct net_device *dev,
4457                                        struct netdev_queue *txq,
4458                                        void *_unused)
4459 {
4460         lockdep_set_class(&txq->_xmit_lock,
4461                           &bonding_netdev_xmit_lock_key);
4462 }
4463
4464 static void bond_set_lockdep_class(struct net_device *dev)
4465 {
4466         lockdep_set_class(&dev->addr_list_lock,
4467                           &bonding_netdev_addr_lock_key);
4468         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4469         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4470 }
4471
4472 /*
4473  * Called from registration process
4474  */
4475 static int bond_init(struct net_device *bond_dev)
4476 {
4477         struct bonding *bond = netdev_priv(bond_dev);
4478         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4479         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4480
4481         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4482
4483         /*
4484          * Initialize locks that may be required during
4485          * en/deslave operations.  All of the bond_open work
4486          * (of which this is part) should really be moved to
4487          * a phase prior to dev_open
4488          */
4489         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4490         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4491
4492         bond->wq = create_singlethread_workqueue(bond_dev->name);
4493         if (!bond->wq)
4494                 return -ENOMEM;
4495
4496         bond_set_lockdep_class(bond_dev);
4497
4498         list_add_tail(&bond->bond_list, &bn->dev_list);
4499
4500         bond_prepare_sysfs_group(bond);
4501
4502         bond_debug_register(bond);
4503
4504         /* Ensure valid dev_addr */
4505         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4506             bond_dev->addr_assign_type == NET_ADDR_PERM)
4507                 eth_hw_addr_random(bond_dev);
4508
4509         return 0;
4510 }
4511
4512 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4513 {
4514         if (tb[IFLA_ADDRESS]) {
4515                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4516                         return -EINVAL;
4517                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4518                         return -EADDRNOTAVAIL;
4519         }
4520         return 0;
4521 }
4522
4523 static unsigned int bond_get_num_tx_queues(void)
4524 {
4525         return tx_queues;
4526 }
4527
4528 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4529         .kind                   = "bond",
4530         .priv_size              = sizeof(struct bonding),
4531         .setup                  = bond_setup,
4532         .validate               = bond_validate,
4533         .get_num_tx_queues      = bond_get_num_tx_queues,
4534         .get_num_rx_queues      = bond_get_num_tx_queues, /* Use the same number
4535                                                              as for TX queues */
4536 };
4537
4538 /* Create a new bond based on the specified name and bonding parameters.
4539  * If name is NULL, obtain a suitable "bond%d" name for us.
4540  * Caller must NOT hold rtnl_lock; we need to release it here before we
4541  * set up our sysfs entries.
4542  */
4543 int bond_create(struct net *net, const char *name)
4544 {
4545         struct net_device *bond_dev;
4546         int res;
4547
4548         rtnl_lock();
4549
4550         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4551                                    name ? name : "bond%d",
4552                                    bond_setup, tx_queues);
4553         if (!bond_dev) {
4554                 pr_err("%s: eek! can't alloc netdev!\n", name);
4555                 rtnl_unlock();
4556                 return -ENOMEM;
4557         }
4558
4559         dev_net_set(bond_dev, net);
4560         bond_dev->rtnl_link_ops = &bond_link_ops;
4561
4562         res = register_netdevice(bond_dev);
4563
4564         netif_carrier_off(bond_dev);
4565
4566         rtnl_unlock();
4567         if (res < 0)
4568                 bond_destructor(bond_dev);
4569         return res;
4570 }
4571
4572 static int __net_init bond_net_init(struct net *net)
4573 {
4574         struct bond_net *bn = net_generic(net, bond_net_id);
4575
4576         bn->net = net;
4577         INIT_LIST_HEAD(&bn->dev_list);
4578
4579         bond_create_proc_dir(bn);
4580         bond_create_sysfs(bn);
4581
4582         return 0;
4583 }
4584
4585 static void __net_exit bond_net_exit(struct net *net)
4586 {
4587         struct bond_net *bn = net_generic(net, bond_net_id);
4588         struct bonding *bond, *tmp_bond;
4589         LIST_HEAD(list);
4590
4591         bond_destroy_sysfs(bn);
4592         bond_destroy_proc_dir(bn);
4593
4594         /* Kill off any bonds created after unregistering bond rtnl ops */
4595         rtnl_lock();
4596         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4597                 unregister_netdevice_queue(bond->dev, &list);
4598         unregister_netdevice_many(&list);
4599         rtnl_unlock();
4600 }
4601
4602 static struct pernet_operations bond_net_ops = {
4603         .init = bond_net_init,
4604         .exit = bond_net_exit,
4605         .id   = &bond_net_id,
4606         .size = sizeof(struct bond_net),
4607 };
4608
4609 static int __init bonding_init(void)
4610 {
4611         int i;
4612         int res;
4613
4614         pr_info("%s", bond_version);
4615
4616         res = bond_check_params(&bonding_defaults);
4617         if (res)
4618                 goto out;
4619
4620         res = register_pernet_subsys(&bond_net_ops);
4621         if (res)
4622                 goto out;
4623
4624         res = rtnl_link_register(&bond_link_ops);
4625         if (res)
4626                 goto err_link;
4627
4628         bond_create_debugfs();
4629
4630         for (i = 0; i < max_bonds; i++) {
4631                 res = bond_create(&init_net, NULL);
4632                 if (res)
4633                         goto err;
4634         }
4635
4636         register_netdevice_notifier(&bond_netdev_notifier);
4637 out:
4638         return res;
4639 err:
4640         rtnl_link_unregister(&bond_link_ops);
4641 err_link:
4642         unregister_pernet_subsys(&bond_net_ops);
4643         goto out;
4644
4645 }
4646
4647 static void __exit bonding_exit(void)
4648 {
4649         unregister_netdevice_notifier(&bond_netdev_notifier);
4650
4651         bond_destroy_debugfs();
4652
4653         rtnl_link_unregister(&bond_link_ops);
4654         unregister_pernet_subsys(&bond_net_ops);
4655
4656 #ifdef CONFIG_NET_POLL_CONTROLLER
4657         /*
4658          * Make sure we don't have an imbalance on our netpoll blocking
4659          */
4660         WARN_ON(atomic_read(&netpoll_block_tx));
4661 #endif
4662 }
4663
4664 module_init(bonding_init);
4665 module_exit(bonding_exit);
4666 MODULE_LICENSE("GPL");
4667 MODULE_VERSION(DRV_VERSION);
4668 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4669 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4670 MODULE_ALIAS_RTNL_LINK("bond");