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

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