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 "bonding.h"
  82 #include "bond_3ad.h"
  83 #include "bond_alb.h"
  84
  85 /*---------------------------- Module parameters ----------------------------*/
  86
  87 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  88 #define BOND_LINK_MON_INTERV    0
  89 #define BOND_LINK_ARP_INTERV    0
  90
  91 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  92 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  93 static int num_peer_notif = 1;
  94 static int miimon       = BOND_LINK_MON_INTERV;
  95 static int updelay;
  96 static int downdelay;
  97 static int use_carrier  = 1;
  98 static char *mode;
  99 static char *primary;
 100 static char *primary_reselect;
 101 static char *lacp_rate;
 102 static int min_links;
 103 static char *ad_select;
 104 static char *xmit_hash_policy;
 105 static int arp_interval = BOND_LINK_ARP_INTERV;
 106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 107 static char *arp_validate;
 108 static char *arp_all_targets;
 109 static char *fail_over_mac;
 110 static int all_slaves_active;
 111 static struct bond_params bonding_defaults;
 112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 113
 114 module_param(max_bonds, int, 0);
 115 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 116 module_param(tx_queues, int, 0);
 117 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 118 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 119 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 120                                "failover event (alias of num_unsol_na)");
 121 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 122 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 123                                "failover event (alias of num_grat_arp)");
 124 module_param(miimon, int, 0);
 125 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 126 module_param(updelay, int, 0);
 127 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 128 module_param(downdelay, int, 0);
 129 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 130                             "in milliseconds");
 131 module_param(use_carrier, int, 0);
 132 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 133                               "0 for off, 1 for on (default)");
 134 module_param(mode, charp, 0);
 135 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 136                        "1 for active-backup, 2 for balance-xor, "
 137                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 138                        "6 for balance-alb");
 139 module_param(primary, charp, 0);
 140 MODULE_PARM_DESC(primary, "Primary network device to use");
 141 module_param(primary_reselect, charp, 0);
 142 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 143                                    "once it comes up; "
 144                                    "0 for always (default), "
 145                                    "1 for only if speed of primary is "
 146                                    "better, "
 147                                    "2 for only on active slave "
 148                                    "failure");
 149 module_param(lacp_rate, charp, 0);
 150 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 151                             "0 for slow, 1 for fast");
 152 module_param(ad_select, charp, 0);
 153 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
 154                             "0 for stable (default), 1 for bandwidth, "
 155                             "2 for count");
 156 module_param(min_links, int, 0);
 157 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 158
 159 module_param(xmit_hash_policy, charp, 0);
 160 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 161                                    "0 for layer 2 (default), 1 for layer 3+4, "
 162                                    "2 for layer 2+3");
 163 module_param(arp_interval, int, 0);
 164 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 165 module_param_array(arp_ip_target, charp, NULL, 0);
 166 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 167 module_param(arp_validate, charp, 0);
 168 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 169                                "0 for none (default), 1 for active, "
 170                                "2 for backup, 3 for all");
 171 module_param(arp_all_targets, charp, 0);
 172 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 173 module_param(fail_over_mac, charp, 0);
 174 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 175                                 "the same MAC; 0 for none (default), "
 176                                 "1 for active, 2 for follow");
 177 module_param(all_slaves_active, int, 0);
 178 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 179                                      "by setting active flag for all slaves; "
 180                                      "0 for never (default), 1 for always.");
 181 module_param(resend_igmp, int, 0);
 182 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 183                               "link failure");
 184
 185 /*----------------------------- Global variables ----------------------------*/
 186
 187 #ifdef CONFIG_NET_POLL_CONTROLLER
 188 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 189 #endif
 190
 191 int bond_net_id __read_mostly;
 192
 193 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 194 static int arp_ip_count;
 195 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 196 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 197 static int lacp_fast;
 198
 199 const struct bond_parm_tbl bond_lacp_tbl[] = {
 200 {       "slow",         AD_LACP_SLOW},
 201 {       "fast",         AD_LACP_FAST},
 202 {       NULL,           -1},
 203 };
 204
 205 const struct bond_parm_tbl bond_mode_tbl[] = {
 206 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 207 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 208 {       "balance-xor",          BOND_MODE_XOR},
 209 {       "broadcast",            BOND_MODE_BROADCAST},
 210 {       "802.3ad",              BOND_MODE_8023AD},
 211 {       "balance-tlb",          BOND_MODE_TLB},
 212 {       "balance-alb",          BOND_MODE_ALB},
 213 {       NULL,                   -1},
 214 };
 215
 216 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 217 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 218 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 219 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 220 {       NULL,                   -1},
 221 };
 222
 223 const struct bond_parm_tbl arp_all_targets_tbl[] = {
 224 {       "any",                  BOND_ARP_TARGETS_ANY},
 225 {       "all",                  BOND_ARP_TARGETS_ALL},
 226 {       NULL,                   -1},
 227 };
 228
 229 const struct bond_parm_tbl arp_validate_tbl[] = {
 230 {       "none",                 BOND_ARP_VALIDATE_NONE},
 231 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 232 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 233 {       "all",                  BOND_ARP_VALIDATE_ALL},
 234 {       NULL,                   -1},
 235 };
 236
 237 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 238 {       "none",                 BOND_FOM_NONE},
 239 {       "active",               BOND_FOM_ACTIVE},
 240 {       "follow",               BOND_FOM_FOLLOW},
 241 {       NULL,                   -1},
 242 };
 243
 244 const struct bond_parm_tbl pri_reselect_tbl[] = {
 245 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 246 {       "better",               BOND_PRI_RESELECT_BETTER},
 247 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 248 {       NULL,                   -1},
 249 };
 250
 251 struct bond_parm_tbl ad_select_tbl[] = {
 252 {       "stable",       BOND_AD_STABLE},
 253 {       "bandwidth",    BOND_AD_BANDWIDTH},
 254 {       "count",        BOND_AD_COUNT},
 255 {       NULL,           -1},
 256 };
 257
 258 /*-------------------------- Forward declarations ---------------------------*/
 259
 260 static int bond_init(struct net_device *bond_dev);
 261 static void bond_uninit(struct net_device *bond_dev);
 262
 263 /*---------------------------- General routines -----------------------------*/
 264
 265 const char *bond_mode_name(int mode)
 266 {
 267         static const char *names[] = {
 268                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 269                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 270                 [BOND_MODE_XOR] = "load balancing (xor)",
 271                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 272                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 273                 [BOND_MODE_TLB] = "transmit load balancing",
 274                 [BOND_MODE_ALB] = "adaptive load balancing",
 275         };
 276
 277         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 278                 return "unknown";
 279
 280         return names[mode];
 281 }
 282
 283 /*---------------------------------- VLAN -----------------------------------*/
 284
 285 /**
 286  * bond_add_vlan - add a new vlan id on bond
 287  * @bond: bond that got the notification
 288  * @vlan_id: the vlan id to add
 289  *
 290  * Returns -ENOMEM if allocation failed.
 291  */
 292 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 293 {
 294         struct vlan_entry *vlan;
 295
 296         pr_debug("bond: %s, vlan id %d\n",
 297                  (bond ? bond->dev->name : "None"), vlan_id);
 298
 299         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 300         if (!vlan)
 301                 return -ENOMEM;
 302
 303         INIT_LIST_HEAD(&vlan->vlan_list);
 304         vlan->vlan_id = vlan_id;
 305
 306         write_lock_bh(&bond->lock);
 307
 308         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 309
 310         write_unlock_bh(&bond->lock);
 311
 312         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 313
 314         return 0;
 315 }
 316
 317 /**
 318  * bond_del_vlan - delete a vlan id from bond
 319  * @bond: bond that got the notification
 320  * @vlan_id: the vlan id to delete
 321  *
 322  * returns -ENODEV if @vlan_id was not found in @bond.
 323  */
 324 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 325 {
 326         struct vlan_entry *vlan;
 327         int res = -ENODEV;
 328
 329         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 330
 331         block_netpoll_tx();
 332         write_lock_bh(&bond->lock);
 333
 334         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 335                 if (vlan->vlan_id == vlan_id) {
 336                         list_del(&vlan->vlan_list);
 337
 338                         if (bond_is_lb(bond))
 339                                 bond_alb_clear_vlan(bond, vlan_id);
 340
 341                         pr_debug("removed VLAN ID %d from bond %s\n",
 342                                  vlan_id, bond->dev->name);
 343
 344                         kfree(vlan);
 345
 346                         res = 0;
 347                         goto out;
 348                 }
 349         }
 350
 351         pr_debug("couldn't find VLAN ID %d in bond %s\n",
 352                  vlan_id, bond->dev->name);
 353
 354 out:
 355         write_unlock_bh(&bond->lock);
 356         unblock_netpoll_tx();
 357         return res;
 358 }
 359
 360 /**
 361  * bond_next_vlan - safely skip to the next item in the vlans list.
 362  * @bond: the bond we're working on
 363  * @curr: item we're advancing from
 364  *
 365  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 366  * or @curr->next otherwise (even if it is @curr itself again).
 367  *
 368  * Caller must hold bond->lock
 369  */
 370 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 371 {
 372         struct vlan_entry *next, *last;
 373
 374         if (list_empty(&bond->vlan_list))
 375                 return NULL;
 376
 377         if (!curr) {
 378                 next = list_entry(bond->vlan_list.next,
 379                                   struct vlan_entry, vlan_list);
 380         } else {
 381                 last = list_entry(bond->vlan_list.prev,
 382                                   struct vlan_entry, vlan_list);
 383                 if (last == curr) {
 384                         next = list_entry(bond->vlan_list.next,
 385                                           struct vlan_entry, vlan_list);
 386                 } else {
 387                         next = list_entry(curr->vlan_list.next,
 388                                           struct vlan_entry, vlan_list);
 389                 }
 390         }
 391
 392         return next;
 393 }
 394
 395 /**
 396  * bond_dev_queue_xmit - Prepare skb for xmit.
 397  *
 398  * @bond: bond device that got this skb for tx.
 399  * @skb: hw accel VLAN tagged skb to transmit
 400  * @slave_dev: slave that is supposed to xmit this skbuff
 401  */
 402 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 403                         struct net_device *slave_dev)
 404 {
 405         skb->dev = slave_dev;
 406
 407         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 408                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 409         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
 410
 411         if (unlikely(netpoll_tx_running(bond->dev)))
 412                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 413         else
 414                 dev_queue_xmit(skb);
 415
 416         return 0;
 417 }
 418
 419 /*
 420  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 421  * We don't protect the slave list iteration with a lock because:
 422  * a. This operation is performed in IOCTL context,
 423  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 424  * c. Holding a lock with BH disabled while directly calling a base driver
 425  *    entry point is generally a BAD idea.
 426  *
 427  * The design of synchronization/protection for this operation in the 8021q
 428  * module is good for one or more VLAN devices over a single physical device
 429  * and cannot be extended for a teaming solution like bonding, so there is a
 430  * potential race condition here where a net device from the vlan group might
 431  * be referenced (either by a base driver or the 8021q code) while it is being
 432  * removed from the system. However, it turns out we're not making matters
 433  * worse, and if it works for regular VLAN usage it will work here too.
 434 */
 435
 436 /**
 437  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 438  * @bond_dev: bonding net device that got called
 439  * @vid: vlan id being added
 440  */
 441 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 442                                 __be16 proto, u16 vid)
 443 {
 444         struct bonding *bond = netdev_priv(bond_dev);
 445         struct slave *slave;
 446         int res;
 447
 448         bond_for_each_slave(bond, slave) {
 449                 res = vlan_vid_add(slave->dev, proto, vid);
 450                 if (res)
 451                         goto unwind;
 452         }
 453
 454         res = bond_add_vlan(bond, vid);
 455         if (res) {
 456                 pr_err("%s: Error: Failed to add vlan id %d\n",
 457                        bond_dev->name, vid);
 458                 return res;
 459         }
 460
 461         return 0;
 462
 463 unwind:
 464         /* unwind from head to the slave that failed */
 465         bond_for_each_slave_continue_reverse(bond, slave)
 466                 vlan_vid_del(slave->dev, proto, vid);
 467
 468         return res;
 469 }
 470
 471 /**
 472  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 473  * @bond_dev: bonding net device that got called
 474  * @vid: vlan id being removed
 475  */
 476 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 477                                  __be16 proto, u16 vid)
 478 {
 479         struct bonding *bond = netdev_priv(bond_dev);
 480         struct slave *slave;
 481         int res;
 482
 483         bond_for_each_slave(bond, slave)
 484                 vlan_vid_del(slave->dev, proto, vid);
 485
 486         res = bond_del_vlan(bond, vid);
 487         if (res) {
 488                 pr_err("%s: Error: Failed to remove vlan id %d\n",
 489                        bond_dev->name, vid);
 490                 return res;
 491         }
 492
 493         return 0;
 494 }
 495
 496 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 497 {
 498         struct vlan_entry *vlan;
 499         int res;
 500
 501         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 502                 res = vlan_vid_add(slave_dev, htons(ETH_P_8021Q),
 503                                    vlan->vlan_id);
 504                 if (res)
 505                         pr_warning("%s: Failed to add vlan id %d to device %s\n",
 506                                    bond->dev->name, vlan->vlan_id,
 507                                    slave_dev->name);
 508         }
 509 }
 510
 511 static void bond_del_vlans_from_slave(struct bonding *bond,
 512                                       struct net_device *slave_dev)
 513 {
 514         struct vlan_entry *vlan;
 515
 516         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 517                 if (!vlan->vlan_id)
 518                         continue;
 519                 vlan_vid_del(slave_dev, htons(ETH_P_8021Q), vlan->vlan_id);
 520         }
 521 }
 522
 523 /*------------------------------- Link status -------------------------------*/
 524
 525 /*
 526  * Set the carrier state for the master according to the state of its
 527  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 528  * do special 802.3ad magic.
 529  *
 530  * Returns zero if carrier state does not change, nonzero if it does.
 531  */
 532 static int bond_set_carrier(struct bonding *bond)
 533 {
 534         struct slave *slave;
 535
 536         if (list_empty(&bond->slave_list))
 537                 goto down;
 538
 539         if (bond->params.mode == BOND_MODE_8023AD)
 540                 return bond_3ad_set_carrier(bond);
 541
 542         bond_for_each_slave(bond, slave) {
 543                 if (slave->link == BOND_LINK_UP) {
 544                         if (!netif_carrier_ok(bond->dev)) {
 545                                 netif_carrier_on(bond->dev);
 546                                 return 1;
 547                         }
 548                         return 0;
 549                 }
 550         }
 551
 552 down:
 553         if (netif_carrier_ok(bond->dev)) {
 554                 netif_carrier_off(bond->dev);
 555                 return 1;
 556         }
 557         return 0;
 558 }
 559
 560 /*
 561  * Get link speed and duplex from the slave's base driver
 562  * using ethtool. If for some reason the call fails or the
 563  * values are invalid, set speed and duplex to -1,
 564  * and return.
 565  */
 566 static void bond_update_speed_duplex(struct slave *slave)
 567 {
 568         struct net_device *slave_dev = slave->dev;
 569         struct ethtool_cmd ecmd;
 570         u32 slave_speed;
 571         int res;
 572
 573         slave->speed = SPEED_UNKNOWN;
 574         slave->duplex = DUPLEX_UNKNOWN;
 575
 576         res = __ethtool_get_settings(slave_dev, &ecmd);
 577         if (res < 0)
 578                 return;
 579
 580         slave_speed = ethtool_cmd_speed(&ecmd);
 581         if (slave_speed == 0 || slave_speed == ((__u32) -1))
 582                 return;
 583
 584         switch (ecmd.duplex) {
 585         case DUPLEX_FULL:
 586         case DUPLEX_HALF:
 587                 break;
 588         default:
 589                 return;
 590         }
 591
 592         slave->speed = slave_speed;
 593         slave->duplex = ecmd.duplex;
 594
 595         return;
 596 }
 597
 598 /*
 599  * if <dev> supports MII link status reporting, check its link status.
 600  *
 601  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 602  * depending upon the setting of the use_carrier parameter.
 603  *
 604  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 605  * can't tell and just pretend it is), or 0, meaning that the link is
 606  * down.
 607  *
 608  * If reporting is non-zero, instead of faking link up, return -1 if
 609  * both ETHTOOL and MII ioctls fail (meaning the device does not
 610  * support them).  If use_carrier is set, return whatever it says.
 611  * It'd be nice if there was a good way to tell if a driver supports
 612  * netif_carrier, but there really isn't.
 613  */
 614 static int bond_check_dev_link(struct bonding *bond,
 615                                struct net_device *slave_dev, int reporting)
 616 {
 617         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 618         int (*ioctl)(struct net_device *, struct ifreq *, int);
 619         struct ifreq ifr;
 620         struct mii_ioctl_data *mii;
 621
 622         if (!reporting && !netif_running(slave_dev))
 623                 return 0;
 624
 625         if (bond->params.use_carrier)
 626                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 627
 628         /* Try to get link status using Ethtool first. */
 629         if (slave_dev->ethtool_ops->get_link)
 630                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 631                         BMSR_LSTATUS : 0;
 632
 633         /* Ethtool can't be used, fallback to MII ioctls. */
 634         ioctl = slave_ops->ndo_do_ioctl;
 635         if (ioctl) {
 636                 /* TODO: set pointer to correct ioctl on a per team member */
 637                 /*       bases to make this more efficient. that is, once  */
 638                 /*       we determine the correct ioctl, we will always    */
 639                 /*       call it and not the others for that team          */
 640                 /*       member.                                           */
 641
 642                 /*
 643                  * We cannot assume that SIOCGMIIPHY will also read a
 644                  * register; not all network drivers (e.g., e100)
 645                  * support that.
 646                  */
 647
 648                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 649                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 650                 mii = if_mii(&ifr);
 651                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 652                         mii->reg_num = MII_BMSR;
 653                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 654                                 return mii->val_out & BMSR_LSTATUS;
 655                 }
 656         }
 657
 658         /*
 659          * If reporting, report that either there's no dev->do_ioctl,
 660          * or both SIOCGMIIREG and get_link failed (meaning that we
 661          * cannot report link status).  If not reporting, pretend
 662          * we're ok.
 663          */
 664         return reporting ? -1 : BMSR_LSTATUS;
 665 }
 666
 667 /*----------------------------- Multicast list ------------------------------*/
 668
 669 /*
 670  * Push the promiscuity flag down to appropriate slaves
 671  */
 672 static int bond_set_promiscuity(struct bonding *bond, int inc)
 673 {
 674         int err = 0;
 675         if (USES_PRIMARY(bond->params.mode)) {
 676                 /* write lock already acquired */
 677                 if (bond->curr_active_slave) {
 678                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 679                                                   inc);
 680                 }
 681         } else {
 682                 struct slave *slave;
 683
 684                 bond_for_each_slave(bond, slave) {
 685                         err = dev_set_promiscuity(slave->dev, inc);
 686                         if (err)
 687                                 return err;
 688                 }
 689         }
 690         return err;
 691 }
 692
 693 /*
 694  * Push the allmulti flag down to all slaves
 695  */
 696 static int bond_set_allmulti(struct bonding *bond, int inc)
 697 {
 698         int err = 0;
 699         if (USES_PRIMARY(bond->params.mode)) {
 700                 /* write lock already acquired */
 701                 if (bond->curr_active_slave) {
 702                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 703                                                inc);
 704                 }
 705         } else {
 706                 struct slave *slave;
 707
 708                 bond_for_each_slave(bond, slave) {
 709                         err = dev_set_allmulti(slave->dev, inc);
 710                         if (err)
 711                                 return err;
 712                 }
 713         }
 714         return err;
 715 }
 716
 717 /*
 718  * Retrieve the list of registered multicast addresses for the bonding
 719  * device and retransmit an IGMP JOIN request to the current active
 720  * slave.
 721  */
 722 static void bond_resend_igmp_join_requests(struct bonding *bond)
 723 {
 724         if (!rtnl_trylock()) {
 725                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 726                 return;
 727         }
 728         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 729         rtnl_unlock();
 730
 731         /* We use curr_slave_lock to protect against concurrent access to
 732          * igmp_retrans from multiple running instances of this function and
 733          * bond_change_active_slave
 734          */
 735         write_lock_bh(&bond->curr_slave_lock);
 736         if (bond->igmp_retrans > 1) {
 737                 bond->igmp_retrans--;
 738                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 739         }
 740         write_unlock_bh(&bond->curr_slave_lock);
 741 }
 742
 743 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 744 {
 745         struct bonding *bond = container_of(work, struct bonding,
 746                                             mcast_work.work);
 747
 748         bond_resend_igmp_join_requests(bond);
 749 }
 750
 751 /* Flush bond's hardware addresses from slave
 752  */
 753 static void bond_hw_addr_flush(struct net_device *bond_dev,
 754                                struct net_device *slave_dev)
 755 {
 756         struct bonding *bond = netdev_priv(bond_dev);
 757
 758         dev_uc_unsync(slave_dev, bond_dev);
 759         dev_mc_unsync(slave_dev, bond_dev);
 760
 761         if (bond->params.mode == BOND_MODE_8023AD) {
 762                 /* del lacpdu mc addr from mc list */
 763                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 764
 765                 dev_mc_del(slave_dev, lacpdu_multicast);
 766         }
 767 }
 768
 769 /*--------------------------- Active slave change ---------------------------*/
 770
 771 /* Update the hardware address list and promisc/allmulti for the new and
 772  * old active slaves (if any).  Modes that are !USES_PRIMARY keep all
 773  * slaves up date at all times; only the USES_PRIMARY modes need to call
 774  * this function to swap these settings during a failover.
 775  */
 776 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 777                               struct slave *old_active)
 778 {
 779         if (old_active) {
 780                 if (bond->dev->flags & IFF_PROMISC)
 781                         dev_set_promiscuity(old_active->dev, -1);
 782
 783                 if (bond->dev->flags & IFF_ALLMULTI)
 784                         dev_set_allmulti(old_active->dev, -1);
 785
 786                 bond_hw_addr_flush(bond->dev, old_active->dev);
 787         }
 788
 789         if (new_active) {
 790                 /* FIXME: Signal errors upstream. */
 791                 if (bond->dev->flags & IFF_PROMISC)
 792                         dev_set_promiscuity(new_active->dev, 1);
 793
 794                 if (bond->dev->flags & IFF_ALLMULTI)
 795                         dev_set_allmulti(new_active->dev, 1);
 796
 797                 netif_addr_lock_bh(bond->dev);
 798                 dev_uc_sync(new_active->dev, bond->dev);
 799                 dev_mc_sync(new_active->dev, bond->dev);
 800                 netif_addr_unlock_bh(bond->dev);
 801         }
 802 }
 803
 804 /**
 805  * bond_set_dev_addr - clone slave's address to bond
 806  * @bond_dev: bond net device
 807  * @slave_dev: slave net device
 808  *
 809  * Should be called with RTNL held.
 810  */
 811 static void bond_set_dev_addr(struct net_device *bond_dev,
 812                               struct net_device *slave_dev)
 813 {
 814         pr_debug("bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 815                  bond_dev, slave_dev, slave_dev->addr_len);
 816         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 817         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 818         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 819 }
 820
 821 /*
 822  * bond_do_fail_over_mac
 823  *
 824  * Perform special MAC address swapping for fail_over_mac settings
 825  *
 826  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 827  */
 828 static void bond_do_fail_over_mac(struct bonding *bond,
 829                                   struct slave *new_active,
 830                                   struct slave *old_active)
 831         __releases(&bond->curr_slave_lock)
 832         __releases(&bond->lock)
 833         __acquires(&bond->lock)
 834         __acquires(&bond->curr_slave_lock)
 835 {
 836         u8 tmp_mac[ETH_ALEN];
 837         struct sockaddr saddr;
 838         int rv;
 839
 840         switch (bond->params.fail_over_mac) {
 841         case BOND_FOM_ACTIVE:
 842                 if (new_active) {
 843                         write_unlock_bh(&bond->curr_slave_lock);
 844                         read_unlock(&bond->lock);
 845                         bond_set_dev_addr(bond->dev, new_active->dev);
 846                         read_lock(&bond->lock);
 847                         write_lock_bh(&bond->curr_slave_lock);
 848                 }
 849                 break;
 850         case BOND_FOM_FOLLOW:
 851                 /*
 852                  * if new_active && old_active, swap them
 853                  * if just old_active, do nothing (going to no active slave)
 854                  * if just new_active, set new_active to bond's MAC
 855                  */
 856                 if (!new_active)
 857                         return;
 858
 859                 write_unlock_bh(&bond->curr_slave_lock);
 860                 read_unlock(&bond->lock);
 861
 862                 if (old_active) {
 863                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
 864                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
 865                                ETH_ALEN);
 866                         saddr.sa_family = new_active->dev->type;
 867                 } else {
 868                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
 869                         saddr.sa_family = bond->dev->type;
 870                 }
 871
 872                 rv = dev_set_mac_address(new_active->dev, &saddr);
 873                 if (rv) {
 874                         pr_err("%s: Error %d setting MAC of slave %s\n",
 875                                bond->dev->name, -rv, new_active->dev->name);
 876                         goto out;
 877                 }
 878
 879                 if (!old_active)
 880                         goto out;
 881
 882                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
 883                 saddr.sa_family = old_active->dev->type;
 884
 885                 rv = dev_set_mac_address(old_active->dev, &saddr);
 886                 if (rv)
 887                         pr_err("%s: Error %d setting MAC of slave %s\n",
 888                                bond->dev->name, -rv, new_active->dev->name);
 889 out:
 890                 read_lock(&bond->lock);
 891                 write_lock_bh(&bond->curr_slave_lock);
 892                 break;
 893         default:
 894                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
 895                        bond->dev->name, bond->params.fail_over_mac);
 896                 break;
 897         }
 898
 899 }
 900
 901 static bool bond_should_change_active(struct bonding *bond)
 902 {
 903         struct slave *prim = bond->primary_slave;
 904         struct slave *curr = bond->curr_active_slave;
 905
 906         if (!prim || !curr || curr->link != BOND_LINK_UP)
 907                 return true;
 908         if (bond->force_primary) {
 909                 bond->force_primary = false;
 910                 return true;
 911         }
 912         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
 913             (prim->speed < curr->speed ||
 914              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
 915                 return false;
 916         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
 917                 return false;
 918         return true;
 919 }
 920
 921 /**
 922  * find_best_interface - select the best available slave to be the active one
 923  * @bond: our bonding struct
 924  *
 925  * Warning: Caller must hold curr_slave_lock for writing.
 926  */
 927 static struct slave *bond_find_best_slave(struct bonding *bond)
 928 {
 929         struct slave *new_active, *old_active;
 930         struct slave *bestslave = NULL;
 931         int mintime = bond->params.updelay;
 932         int i;
 933
 934         new_active = bond->curr_active_slave;
 935
 936         if (!new_active) { /* there were no active slaves left */
 937                 new_active = bond_first_slave(bond);
 938                 if (!new_active)
 939                         return NULL; /* still no slave, return NULL */
 940         }
 941
 942         if ((bond->primary_slave) &&
 943             bond->primary_slave->link == BOND_LINK_UP &&
 944             bond_should_change_active(bond)) {
 945                 new_active = bond->primary_slave;
 946         }
 947
 948         /* remember where to stop iterating over the slaves */
 949         old_active = new_active;
 950
 951         bond_for_each_slave_from(bond, new_active, i, old_active) {
 952                 if (new_active->link == BOND_LINK_UP) {
 953                         return new_active;
 954                 } else if (new_active->link == BOND_LINK_BACK &&
 955                            IS_UP(new_active->dev)) {
 956                         /* link up, but waiting for stabilization */
 957                         if (new_active->delay < mintime) {
 958                                 mintime = new_active->delay;
 959                                 bestslave = new_active;
 960                         }
 961                 }
 962         }
 963
 964         return bestslave;
 965 }
 966
 967 static bool bond_should_notify_peers(struct bonding *bond)
 968 {
 969         struct slave *slave = bond->curr_active_slave;
 970
 971         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
 972                  bond->dev->name, slave ? slave->dev->name : "NULL");
 973
 974         if (!slave || !bond->send_peer_notif ||
 975             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 976                 return false;
 977
 978         bond->send_peer_notif--;
 979         return true;
 980 }
 981
 982 /**
 983  * change_active_interface - change the active slave into the specified one
 984  * @bond: our bonding struct
 985  * @new: the new slave to make the active one
 986  *
 987  * Set the new slave to the bond's settings and unset them on the old
 988  * curr_active_slave.
 989  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 990  *
 991  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 992  * because it is apparently the best available slave we have, even though its
 993  * updelay hasn't timed out yet.
 994  *
 995  * If new_active is not NULL, caller must hold bond->lock for read and
 996  * curr_slave_lock for write_bh.
 997  */
 998 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 999 {
1000         struct slave *old_active = bond->curr_active_slave;
1001
1002         if (old_active == new_active)
1003                 return;
1004
1005         if (new_active) {
1006                 new_active->jiffies = jiffies;
1007
1008                 if (new_active->link == BOND_LINK_BACK) {
1009                         if (USES_PRIMARY(bond->params.mode)) {
1010                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1011                                         bond->dev->name, new_active->dev->name,
1012                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
1013                         }
1014
1015                         new_active->delay = 0;
1016                         new_active->link = BOND_LINK_UP;
1017
1018                         if (bond->params.mode == BOND_MODE_8023AD)
1019                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1020
1021                         if (bond_is_lb(bond))
1022                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1023                 } else {
1024                         if (USES_PRIMARY(bond->params.mode)) {
1025                                 pr_info("%s: making interface %s the new active one.\n",
1026                                         bond->dev->name, new_active->dev->name);
1027                         }
1028                 }
1029         }
1030
1031         if (USES_PRIMARY(bond->params.mode))
1032                 bond_hw_addr_swap(bond, new_active, old_active);
1033
1034         if (bond_is_lb(bond)) {
1035                 bond_alb_handle_active_change(bond, new_active);
1036                 if (old_active)
1037                         bond_set_slave_inactive_flags(old_active);
1038                 if (new_active)
1039                         bond_set_slave_active_flags(new_active);
1040         } else {
1041                 rcu_assign_pointer(bond->curr_active_slave, new_active);
1042         }
1043
1044         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1045                 if (old_active)
1046                         bond_set_slave_inactive_flags(old_active);
1047
1048                 if (new_active) {
1049                         bool should_notify_peers = false;
1050
1051                         bond_set_slave_active_flags(new_active);
1052
1053                         if (bond->params.fail_over_mac)
1054                                 bond_do_fail_over_mac(bond, new_active,
1055                                                       old_active);
1056
1057                         if (netif_running(bond->dev)) {
1058                                 bond->send_peer_notif =
1059                                         bond->params.num_peer_notif;
1060                                 should_notify_peers =
1061                                         bond_should_notify_peers(bond);
1062                         }
1063
1064                         write_unlock_bh(&bond->curr_slave_lock);
1065                         read_unlock(&bond->lock);
1066
1067                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1068                         if (should_notify_peers)
1069                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1070                                                          bond->dev);
1071
1072                         read_lock(&bond->lock);
1073                         write_lock_bh(&bond->curr_slave_lock);
1074                 }
1075         }
1076
1077         /* resend IGMP joins since active slave has changed or
1078          * all were sent on curr_active_slave.
1079          * resend only if bond is brought up with the affected
1080          * bonding modes and the retransmission is enabled */
1081         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1082             ((USES_PRIMARY(bond->params.mode) && new_active) ||
1083              bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1084                 bond->igmp_retrans = bond->params.resend_igmp;
1085                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1086         }
1087 }
1088
1089 /**
1090  * bond_select_active_slave - select a new active slave, if needed
1091  * @bond: our bonding struct
1092  *
1093  * This functions should be called when one of the following occurs:
1094  * - The old curr_active_slave has been released or lost its link.
1095  * - The primary_slave has got its link back.
1096  * - A slave has got its link back and there's no old curr_active_slave.
1097  *
1098  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1099  */
1100 void bond_select_active_slave(struct bonding *bond)
1101 {
1102         struct slave *best_slave;
1103         int rv;
1104
1105         best_slave = bond_find_best_slave(bond);
1106         if (best_slave != bond->curr_active_slave) {
1107                 bond_change_active_slave(bond, best_slave);
1108                 rv = bond_set_carrier(bond);
1109                 if (!rv)
1110                         return;
1111
1112                 if (netif_carrier_ok(bond->dev)) {
1113                         pr_info("%s: first active interface up!\n",
1114                                 bond->dev->name);
1115                 } else {
1116                         pr_info("%s: now running without any active interface !\n",
1117                                 bond->dev->name);
1118                 }
1119         }
1120 }
1121
1122 /*--------------------------- slave list handling ---------------------------*/
1123
1124 /*
1125  * This function attaches the slave to the end of list.
1126  *
1127  * bond->lock held for writing by caller.
1128  */
1129 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1130 {
1131         list_add_tail_rcu(&new_slave->list, &bond->slave_list);
1132         bond->slave_cnt++;
1133 }
1134
1135 /*
1136  * This function detaches the slave from the list.
1137  * WARNING: no check is made to verify if the slave effectively
1138  * belongs to <bond>.
1139  * Nothing is freed on return, structures are just unchained.
1140  * If any slave pointer in bond was pointing to <slave>,
1141  * it should be changed by the calling function.
1142  *
1143  * bond->lock held for writing by caller.
1144  */
1145 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1146 {
1147         list_del_rcu(&slave->list);
1148         bond->slave_cnt--;
1149 }
1150
1151 #ifdef CONFIG_NET_POLL_CONTROLLER
1152 static inline int slave_enable_netpoll(struct slave *slave)
1153 {
1154         struct netpoll *np;
1155         int err = 0;
1156
1157         np = kzalloc(sizeof(*np), GFP_ATOMIC);
1158         err = -ENOMEM;
1159         if (!np)
1160                 goto out;
1161
1162         err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
1163         if (err) {
1164                 kfree(np);
1165                 goto out;
1166         }
1167         slave->np = np;
1168 out:
1169         return err;
1170 }
1171 static inline void slave_disable_netpoll(struct slave *slave)
1172 {
1173         struct netpoll *np = slave->np;
1174
1175         if (!np)
1176                 return;
1177
1178         slave->np = NULL;
1179         __netpoll_free_async(np);
1180 }
1181 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1182 {
1183         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1184                 return false;
1185         if (!slave_dev->netdev_ops->ndo_poll_controller)
1186                 return false;
1187         return true;
1188 }
1189
1190 static void bond_poll_controller(struct net_device *bond_dev)
1191 {
1192 }
1193
1194 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1195 {
1196         struct bonding *bond = netdev_priv(bond_dev);
1197         struct slave *slave;
1198
1199         bond_for_each_slave(bond, slave)
1200                 if (IS_UP(slave->dev))
1201                         slave_disable_netpoll(slave);
1202 }
1203
1204 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
1205 {
1206         struct bonding *bond = netdev_priv(dev);
1207         struct slave *slave;
1208         int err = 0;
1209
1210         bond_for_each_slave(bond, slave) {
1211                 err = slave_enable_netpoll(slave);
1212                 if (err) {
1213                         bond_netpoll_cleanup(dev);
1214                         break;
1215                 }
1216         }
1217         return err;
1218 }
1219 #else
1220 static inline int slave_enable_netpoll(struct slave *slave)
1221 {
1222         return 0;
1223 }
1224 static inline void slave_disable_netpoll(struct slave *slave)
1225 {
1226 }
1227 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1228 {
1229 }
1230 #endif
1231
1232 /*---------------------------------- IOCTL ----------------------------------*/
1233
1234 static netdev_features_t bond_fix_features(struct net_device *dev,
1235         netdev_features_t features)
1236 {
1237         struct slave *slave;
1238         struct bonding *bond = netdev_priv(dev);
1239         netdev_features_t mask;
1240
1241         read_lock(&bond->lock);
1242
1243         if (list_empty(&bond->slave_list)) {
1244                 /* Disable adding VLANs to empty bond. But why? --mq */
1245                 features |= NETIF_F_VLAN_CHALLENGED;
1246                 goto out;
1247         }
1248
1249         mask = features;
1250         features &= ~NETIF_F_ONE_FOR_ALL;
1251         features |= NETIF_F_ALL_FOR_ALL;
1252
1253         bond_for_each_slave(bond, slave) {
1254                 features = netdev_increment_features(features,
1255                                                      slave->dev->features,
1256                                                      mask);
1257         }
1258         features = netdev_add_tso_features(features, mask);
1259
1260 out:
1261         read_unlock(&bond->lock);
1262         return features;
1263 }
1264
1265 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1266                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1267                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1268
1269 static void bond_compute_features(struct bonding *bond)
1270 {
1271         struct slave *slave;
1272         struct net_device *bond_dev = bond->dev;
1273         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1274         unsigned short max_hard_header_len = ETH_HLEN;
1275         unsigned int gso_max_size = GSO_MAX_SIZE;
1276         u16 gso_max_segs = GSO_MAX_SEGS;
1277         unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1278
1279         read_lock(&bond->lock);
1280
1281         if (list_empty(&bond->slave_list))
1282                 goto done;
1283
1284         bond_for_each_slave(bond, slave) {
1285                 vlan_features = netdev_increment_features(vlan_features,
1286                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1287
1288                 dst_release_flag &= slave->dev->priv_flags;
1289                 if (slave->dev->hard_header_len > max_hard_header_len)
1290                         max_hard_header_len = slave->dev->hard_header_len;
1291
1292                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1293                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1294         }
1295
1296 done:
1297         bond_dev->vlan_features = vlan_features;
1298         bond_dev->hard_header_len = max_hard_header_len;
1299         bond_dev->gso_max_segs = gso_max_segs;
1300         netif_set_gso_max_size(bond_dev, gso_max_size);
1301
1302         flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1303         bond_dev->priv_flags = flags | dst_release_flag;
1304
1305         read_unlock(&bond->lock);
1306
1307         netdev_change_features(bond_dev);
1308 }
1309
1310 static void bond_setup_by_slave(struct net_device *bond_dev,
1311                                 struct net_device *slave_dev)
1312 {
1313         bond_dev->header_ops        = slave_dev->header_ops;
1314
1315         bond_dev->type              = slave_dev->type;
1316         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1317         bond_dev->addr_len          = slave_dev->addr_len;
1318
1319         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1320                 slave_dev->addr_len);
1321 }
1322
1323 /* On bonding slaves other than the currently active slave, suppress
1324  * duplicates except for alb non-mcast/bcast.
1325  */
1326 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1327                                             struct slave *slave,
1328                                             struct bonding *bond)
1329 {
1330         if (bond_is_slave_inactive(slave)) {
1331                 if (bond->params.mode == BOND_MODE_ALB &&
1332                     skb->pkt_type != PACKET_BROADCAST &&
1333                     skb->pkt_type != PACKET_MULTICAST)
1334                         return false;
1335                 return true;
1336         }
1337         return false;
1338 }
1339
1340 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1341 {
1342         struct sk_buff *skb = *pskb;
1343         struct slave *slave;
1344         struct bonding *bond;
1345         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1346                           struct slave *);
1347         int ret = RX_HANDLER_ANOTHER;
1348
1349         skb = skb_share_check(skb, GFP_ATOMIC);
1350         if (unlikely(!skb))
1351                 return RX_HANDLER_CONSUMED;
1352
1353         *pskb = skb;
1354
1355         slave = bond_slave_get_rcu(skb->dev);
1356         bond = slave->bond;
1357
1358         if (bond->params.arp_interval)
1359                 slave->dev->last_rx = jiffies;
1360
1361         recv_probe = ACCESS_ONCE(bond->recv_probe);
1362         if (recv_probe) {
1363                 ret = recv_probe(skb, bond, slave);
1364                 if (ret == RX_HANDLER_CONSUMED) {
1365                         consume_skb(skb);
1366                         return ret;
1367                 }
1368         }
1369
1370         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1371                 return RX_HANDLER_EXACT;
1372         }
1373
1374         skb->dev = bond->dev;
1375
1376         if (bond->params.mode == BOND_MODE_ALB &&
1377             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1378             skb->pkt_type == PACKET_HOST) {
1379
1380                 if (unlikely(skb_cow_head(skb,
1381                                           skb->data - skb_mac_header(skb)))) {
1382                         kfree_skb(skb);
1383                         return RX_HANDLER_CONSUMED;
1384                 }
1385                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1386         }
1387
1388         return ret;
1389 }
1390
1391 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1392                                       struct net_device *slave_dev)
1393 {
1394         int err;
1395
1396         err = netdev_master_upper_dev_link(slave_dev, bond_dev);
1397         if (err)
1398                 return err;
1399         slave_dev->flags |= IFF_SLAVE;
1400         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1401         return 0;
1402 }
1403
1404 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1405                                   struct net_device *slave_dev)
1406 {
1407         netdev_upper_dev_unlink(slave_dev, bond_dev);
1408         slave_dev->flags &= ~IFF_SLAVE;
1409         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1410 }
1411
1412 /* enslave device <slave> to bond device <master> */
1413 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1414 {
1415         struct bonding *bond = netdev_priv(bond_dev);
1416         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1417         struct slave *new_slave = NULL;
1418         struct sockaddr addr;
1419         int link_reporting;
1420         int res = 0, i;
1421
1422         if (!bond->params.use_carrier &&
1423             slave_dev->ethtool_ops->get_link == NULL &&
1424             slave_ops->ndo_do_ioctl == NULL) {
1425                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1426                            bond_dev->name, slave_dev->name);
1427         }
1428
1429         /* already enslaved */
1430         if (slave_dev->flags & IFF_SLAVE) {
1431                 pr_debug("Error, Device was already enslaved\n");
1432                 return -EBUSY;
1433         }
1434
1435         /* vlan challenged mutual exclusion */
1436         /* no need to lock since we're protected by rtnl_lock */
1437         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1438                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1439                 if (vlan_uses_dev(bond_dev)) {
1440                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1441                                bond_dev->name, slave_dev->name, bond_dev->name);
1442                         return -EPERM;
1443                 } else {
1444                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1445                                    bond_dev->name, slave_dev->name,
1446                                    slave_dev->name, bond_dev->name);
1447                 }
1448         } else {
1449                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1450         }
1451
1452         /*
1453          * Old ifenslave binaries are no longer supported.  These can
1454          * be identified with moderate accuracy by the state of the slave:
1455          * the current ifenslave will set the interface down prior to
1456          * enslaving it; the old ifenslave will not.
1457          */
1458         if ((slave_dev->flags & IFF_UP)) {
1459                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1460                        slave_dev->name);
1461                 res = -EPERM;
1462                 goto err_undo_flags;
1463         }
1464
1465         /* set bonding device ether type by slave - bonding netdevices are
1466          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1467          * there is a need to override some of the type dependent attribs/funcs.
1468          *
1469          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1470          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1471          */
1472         if (list_empty(&bond->slave_list)) {
1473                 if (bond_dev->type != slave_dev->type) {
1474                         pr_debug("%s: change device type from %d to %d\n",
1475                                  bond_dev->name,
1476                                  bond_dev->type, slave_dev->type);
1477
1478                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1479                                                        bond_dev);
1480                         res = notifier_to_errno(res);
1481                         if (res) {
1482                                 pr_err("%s: refused to change device type\n",
1483                                        bond_dev->name);
1484                                 res = -EBUSY;
1485                                 goto err_undo_flags;
1486                         }
1487
1488                         /* Flush unicast and multicast addresses */
1489                         dev_uc_flush(bond_dev);
1490                         dev_mc_flush(bond_dev);
1491
1492                         if (slave_dev->type != ARPHRD_ETHER)
1493                                 bond_setup_by_slave(bond_dev, slave_dev);
1494                         else {
1495                                 ether_setup(bond_dev);
1496                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1497                         }
1498
1499                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1500                                                  bond_dev);
1501                 }
1502         } else if (bond_dev->type != slave_dev->type) {
1503                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1504                        slave_dev->name,
1505                        slave_dev->type, bond_dev->type);
1506                 res = -EINVAL;
1507                 goto err_undo_flags;
1508         }
1509
1510         if (slave_ops->ndo_set_mac_address == NULL) {
1511                 if (list_empty(&bond->slave_list)) {
1512                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1513                                    bond_dev->name);
1514                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1515                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1516                         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",
1517                                bond_dev->name);
1518                         res = -EOPNOTSUPP;
1519                         goto err_undo_flags;
1520                 }
1521         }
1522
1523         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1524
1525         /* If this is the first slave, then we need to set the master's hardware
1526          * address to be the same as the slave's. */
1527         if (list_empty(&bond->slave_list) &&
1528             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1529                 bond_set_dev_addr(bond->dev, slave_dev);
1530
1531         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1532         if (!new_slave) {
1533                 res = -ENOMEM;
1534                 goto err_undo_flags;
1535         }
1536         INIT_LIST_HEAD(&new_slave->list);
1537         /*
1538          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1539          * is set via sysfs or module option if desired.
1540          */
1541         new_slave->queue_id = 0;
1542
1543         /* Save slave's original mtu and then set it to match the bond */
1544         new_slave->original_mtu = slave_dev->mtu;
1545         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1546         if (res) {
1547                 pr_debug("Error %d calling dev_set_mtu\n", res);
1548                 goto err_free;
1549         }
1550
1551         /*
1552          * Save slave's original ("permanent") mac address for modes
1553          * that need it, and for restoring it upon release, and then
1554          * set it to the master's address
1555          */
1556         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1557
1558         if (!bond->params.fail_over_mac) {
1559                 /*
1560                  * Set slave to master's mac address.  The application already
1561                  * set the master's mac address to that of the first slave
1562                  */
1563                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1564                 addr.sa_family = slave_dev->type;
1565                 res = dev_set_mac_address(slave_dev, &addr);
1566                 if (res) {
1567                         pr_debug("Error %d calling set_mac_address\n", res);
1568                         goto err_restore_mtu;
1569                 }
1570         }
1571
1572         res = bond_master_upper_dev_link(bond_dev, slave_dev);
1573         if (res) {
1574                 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1575                 goto err_restore_mac;
1576         }
1577
1578         /* open the slave since the application closed it */
1579         res = dev_open(slave_dev);
1580         if (res) {
1581                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1582                 goto err_unset_master;
1583         }
1584
1585         new_slave->bond = bond;
1586         new_slave->dev = slave_dev;
1587         slave_dev->priv_flags |= IFF_BONDING;
1588
1589         if (bond_is_lb(bond)) {
1590                 /* bond_alb_init_slave() must be called before all other stages since
1591                  * it might fail and we do not want to have to undo everything
1592                  */
1593                 res = bond_alb_init_slave(bond, new_slave);
1594                 if (res)
1595                         goto err_close;
1596         }
1597
1598         /* If the mode USES_PRIMARY, then the following is handled by
1599          * bond_change_active_slave().
1600          */
1601         if (!USES_PRIMARY(bond->params.mode)) {
1602                 /* set promiscuity level to new slave */
1603                 if (bond_dev->flags & IFF_PROMISC) {
1604                         res = dev_set_promiscuity(slave_dev, 1);
1605                         if (res)
1606                                 goto err_close;
1607                 }
1608
1609                 /* set allmulti level to new slave */
1610                 if (bond_dev->flags & IFF_ALLMULTI) {
1611                         res = dev_set_allmulti(slave_dev, 1);
1612                         if (res)
1613                                 goto err_close;
1614                 }
1615
1616                 netif_addr_lock_bh(bond_dev);
1617
1618                 dev_mc_sync_multiple(slave_dev, bond_dev);
1619                 dev_uc_sync_multiple(slave_dev, bond_dev);
1620
1621                 netif_addr_unlock_bh(bond_dev);
1622         }
1623
1624         if (bond->params.mode == BOND_MODE_8023AD) {
1625                 /* add lacpdu mc addr to mc list */
1626                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1627
1628                 dev_mc_add(slave_dev, lacpdu_multicast);
1629         }
1630
1631         bond_add_vlans_on_slave(bond, slave_dev);
1632
1633         write_lock_bh(&bond->lock);
1634
1635         bond_attach_slave(bond, new_slave);
1636
1637         new_slave->delay = 0;
1638         new_slave->link_failure_count = 0;
1639
1640         write_unlock_bh(&bond->lock);
1641
1642         bond_compute_features(bond);
1643
1644         bond_update_speed_duplex(new_slave);
1645
1646         read_lock(&bond->lock);
1647
1648         new_slave->last_arp_rx = jiffies -
1649                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1650         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1651                 new_slave->target_last_arp_rx[i] = new_slave->last_arp_rx;
1652
1653         if (bond->params.miimon && !bond->params.use_carrier) {
1654                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1655
1656                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1657                         /*
1658                          * miimon is set but a bonded network driver
1659                          * does not support ETHTOOL/MII and
1660                          * arp_interval is not set.  Note: if
1661                          * use_carrier is enabled, we will never go
1662                          * here (because netif_carrier is always
1663                          * supported); thus, we don't need to change
1664                          * the messages for netif_carrier.
1665                          */
1666                         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",
1667                                bond_dev->name, slave_dev->name);
1668                 } else if (link_reporting == -1) {
1669                         /* unable get link status using mii/ethtool */
1670                         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",
1671                                    bond_dev->name, slave_dev->name);
1672                 }
1673         }
1674
1675         /* check for initial state */
1676         if (bond->params.miimon) {
1677                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1678                         if (bond->params.updelay) {
1679                                 new_slave->link = BOND_LINK_BACK;
1680                                 new_slave->delay = bond->params.updelay;
1681                         } else {
1682                                 new_slave->link = BOND_LINK_UP;
1683                         }
1684                 } else {
1685                         new_slave->link = BOND_LINK_DOWN;
1686                 }
1687         } else if (bond->params.arp_interval) {
1688                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1689                         BOND_LINK_UP : BOND_LINK_DOWN);
1690         } else {
1691                 new_slave->link = BOND_LINK_UP;
1692         }
1693
1694         if (new_slave->link != BOND_LINK_DOWN)
1695                 new_slave->jiffies = jiffies;
1696         pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1697                 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1698                         (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1699
1700         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1701                 /* if there is a primary slave, remember it */
1702                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1703                         bond->primary_slave = new_slave;
1704                         bond->force_primary = true;
1705                 }
1706         }
1707
1708         write_lock_bh(&bond->curr_slave_lock);
1709
1710         switch (bond->params.mode) {
1711         case BOND_MODE_ACTIVEBACKUP:
1712                 bond_set_slave_inactive_flags(new_slave);
1713                 bond_select_active_slave(bond);
1714                 break;
1715         case BOND_MODE_8023AD:
1716                 /* in 802.3ad mode, the internal mechanism
1717                  * will activate the slaves in the selected
1718                  * aggregator
1719                  */
1720                 bond_set_slave_inactive_flags(new_slave);
1721                 /* if this is the first slave */
1722                 if (bond_first_slave(bond) == new_slave) {
1723                         SLAVE_AD_INFO(new_slave).id = 1;
1724                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1725                          * can be called only after the mac address of the bond is set
1726                          */
1727                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1728                 } else {
1729                         struct slave *prev_slave;
1730
1731                         prev_slave = bond_prev_slave(bond, new_slave);
1732                         SLAVE_AD_INFO(new_slave).id =
1733                                 SLAVE_AD_INFO(prev_slave).id + 1;
1734                 }
1735
1736                 bond_3ad_bind_slave(new_slave);
1737                 break;
1738         case BOND_MODE_TLB:
1739         case BOND_MODE_ALB:
1740                 bond_set_active_slave(new_slave);
1741                 bond_set_slave_inactive_flags(new_slave);
1742                 bond_select_active_slave(bond);
1743                 break;
1744         default:
1745                 pr_debug("This slave is always active in trunk mode\n");
1746
1747                 /* always active in trunk mode */
1748                 bond_set_active_slave(new_slave);
1749
1750                 /* In trunking mode there is little meaning to curr_active_slave
1751                  * anyway (it holds no special properties of the bond device),
1752                  * so we can change it without calling change_active_interface()
1753                  */
1754                 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1755                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1756
1757                 break;
1758         } /* switch(bond_mode) */
1759
1760         write_unlock_bh(&bond->curr_slave_lock);
1761
1762         bond_set_carrier(bond);
1763
1764 #ifdef CONFIG_NET_POLL_CONTROLLER
1765         slave_dev->npinfo = bond->dev->npinfo;
1766         if (slave_dev->npinfo) {
1767                 if (slave_enable_netpoll(new_slave)) {
1768                         read_unlock(&bond->lock);
1769                         pr_info("Error, %s: master_dev is using netpoll, "
1770                                  "but new slave device does not support netpoll.\n",
1771                                  bond_dev->name);
1772                         res = -EBUSY;
1773                         goto err_detach;
1774                 }
1775         }
1776 #endif
1777
1778         read_unlock(&bond->lock);
1779
1780         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1781         if (res)
1782                 goto err_detach;
1783
1784         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1785                                          new_slave);
1786         if (res) {
1787                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1788                 goto err_dest_symlinks;
1789         }
1790
1791         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1792                 bond_dev->name, slave_dev->name,
1793                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1794                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1795
1796         /* enslave is successful */
1797         return 0;
1798
1799 /* Undo stages on error */
1800 err_dest_symlinks:
1801         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1802
1803 err_detach:
1804         if (!USES_PRIMARY(bond->params.mode))
1805                 bond_hw_addr_flush(bond_dev, slave_dev);
1806
1807         bond_del_vlans_from_slave(bond, slave_dev);
1808         write_lock_bh(&bond->lock);
1809         bond_detach_slave(bond, new_slave);
1810         if (bond->primary_slave == new_slave)
1811                 bond->primary_slave = NULL;
1812         if (bond->curr_active_slave == new_slave) {
1813                 bond_change_active_slave(bond, NULL);
1814                 write_unlock_bh(&bond->lock);
1815                 read_lock(&bond->lock);
1816                 write_lock_bh(&bond->curr_slave_lock);
1817                 bond_select_active_slave(bond);
1818                 write_unlock_bh(&bond->curr_slave_lock);
1819                 read_unlock(&bond->lock);
1820         } else {
1821                 write_unlock_bh(&bond->lock);
1822         }
1823         slave_disable_netpoll(new_slave);
1824
1825 err_close:
1826         slave_dev->priv_flags &= ~IFF_BONDING;
1827         dev_close(slave_dev);
1828
1829 err_unset_master:
1830         bond_upper_dev_unlink(bond_dev, slave_dev);
1831
1832 err_restore_mac:
1833         if (!bond->params.fail_over_mac) {
1834                 /* XXX TODO - fom follow mode needs to change master's
1835                  * MAC if this slave's MAC is in use by the bond, or at
1836                  * least print a warning.
1837                  */
1838                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1839                 addr.sa_family = slave_dev->type;
1840                 dev_set_mac_address(slave_dev, &addr);
1841         }
1842
1843 err_restore_mtu:
1844         dev_set_mtu(slave_dev, new_slave->original_mtu);
1845
1846 err_free:
1847         kfree(new_slave);
1848
1849 err_undo_flags:
1850         bond_compute_features(bond);
1851         /* Enslave of first slave has failed and we need to fix master's mac */
1852         if (list_empty(&bond->slave_list) &&
1853             ether_addr_equal(bond_dev->dev_addr, slave_dev->dev_addr))
1854                 eth_hw_addr_random(bond_dev);
1855
1856         return res;
1857 }
1858
1859 /*
1860  * Try to release the slave device <slave> from the bond device <master>
1861  * It is legal to access curr_active_slave without a lock because all the function
1862  * is write-locked. If "all" is true it means that the function is being called
1863  * while destroying a bond interface and all slaves are being released.
1864  *
1865  * The rules for slave state should be:
1866  *   for Active/Backup:
1867  *     Active stays on all backups go down
1868  *   for Bonded connections:
1869  *     The first up interface should be left on and all others downed.
1870  */
1871 static int __bond_release_one(struct net_device *bond_dev,
1872                               struct net_device *slave_dev,
1873                               bool all)
1874 {
1875         struct bonding *bond = netdev_priv(bond_dev);
1876         struct slave *slave, *oldcurrent;
1877         struct sockaddr addr;
1878         netdev_features_t old_features = bond_dev->features;
1879
1880         /* slave is not a slave or master is not master of this slave */
1881         if (!(slave_dev->flags & IFF_SLAVE) ||
1882             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1883                 pr_err("%s: Error: cannot release %s.\n",
1884                        bond_dev->name, slave_dev->name);
1885                 return -EINVAL;
1886         }
1887
1888         block_netpoll_tx();
1889         write_lock_bh(&bond->lock);
1890
1891         slave = bond_get_slave_by_dev(bond, slave_dev);
1892         if (!slave) {
1893                 /* not a slave of this bond */
1894                 pr_info("%s: %s not enslaved\n",
1895                         bond_dev->name, slave_dev->name);
1896                 write_unlock_bh(&bond->lock);
1897                 unblock_netpoll_tx();
1898                 return -EINVAL;
1899         }
1900
1901         write_unlock_bh(&bond->lock);
1902         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1903          * for this slave anymore.
1904          */
1905         netdev_rx_handler_unregister(slave_dev);
1906         write_lock_bh(&bond->lock);
1907
1908         /* Inform AD package of unbinding of slave. */
1909         if (bond->params.mode == BOND_MODE_8023AD) {
1910                 /* must be called before the slave is
1911                  * detached from the list
1912                  */
1913                 bond_3ad_unbind_slave(slave);
1914         }
1915
1916         pr_info("%s: releasing %s interface %s\n",
1917                 bond_dev->name,
1918                 bond_is_active_slave(slave) ? "active" : "backup",
1919                 slave_dev->name);
1920
1921         oldcurrent = bond->curr_active_slave;
1922
1923         bond->current_arp_slave = NULL;
1924
1925         /* release the slave from its bond */
1926         bond_detach_slave(bond, slave);
1927
1928         if (!all && !bond->params.fail_over_mac) {
1929                 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
1930                     !list_empty(&bond->slave_list))
1931                         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",
1932                                    bond_dev->name, slave_dev->name,
1933                                    slave->perm_hwaddr,
1934                                    bond_dev->name, slave_dev->name);
1935         }
1936
1937         if (bond->primary_slave == slave)
1938                 bond->primary_slave = NULL;
1939
1940         if (oldcurrent == slave)
1941                 bond_change_active_slave(bond, NULL);
1942
1943         if (bond_is_lb(bond)) {
1944                 /* Must be called only after the slave has been
1945                  * detached from the list and the curr_active_slave
1946                  * has been cleared (if our_slave == old_current),
1947                  * but before a new active slave is selected.
1948                  */
1949                 write_unlock_bh(&bond->lock);
1950                 bond_alb_deinit_slave(bond, slave);
1951                 write_lock_bh(&bond->lock);
1952         }
1953
1954         if (all) {
1955                 rcu_assign_pointer(bond->curr_active_slave, NULL);
1956         } else if (oldcurrent == slave) {
1957                 /*
1958                  * Note that we hold RTNL over this sequence, so there
1959                  * is no concern that another slave add/remove event
1960                  * will interfere.
1961                  */
1962                 write_unlock_bh(&bond->lock);
1963                 read_lock(&bond->lock);
1964                 write_lock_bh(&bond->curr_slave_lock);
1965
1966                 bond_select_active_slave(bond);
1967
1968                 write_unlock_bh(&bond->curr_slave_lock);
1969                 read_unlock(&bond->lock);
1970                 write_lock_bh(&bond->lock);
1971         }
1972
1973         if (list_empty(&bond->slave_list)) {
1974                 bond_set_carrier(bond);
1975                 eth_hw_addr_random(bond_dev);
1976
1977                 if (bond_vlan_used(bond)) {
1978                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1979                                    bond_dev->name, bond_dev->name);
1980                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1981                                    bond_dev->name);
1982                 }
1983         }
1984
1985         write_unlock_bh(&bond->lock);
1986         unblock_netpoll_tx();
1987         synchronize_rcu();
1988
1989         if (list_empty(&bond->slave_list)) {
1990                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1991                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1992         }
1993
1994         bond_compute_features(bond);
1995         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1996             (old_features & NETIF_F_VLAN_CHALLENGED))
1997                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1998                         bond_dev->name, slave_dev->name, bond_dev->name);
1999
2000         /* must do this from outside any spinlocks */
2001         bond_destroy_slave_symlinks(bond_dev, slave_dev);
2002
2003         bond_del_vlans_from_slave(bond, slave_dev);
2004
2005         /* If the mode USES_PRIMARY, then this cases was handled above by
2006          * bond_change_active_slave(..., NULL)
2007          */
2008         if (!USES_PRIMARY(bond->params.mode)) {
2009                 /* unset promiscuity level from slave */
2010                 if (bond_dev->flags & IFF_PROMISC)
2011                         dev_set_promiscuity(slave_dev, -1);
2012
2013                 /* unset allmulti level from slave */
2014                 if (bond_dev->flags & IFF_ALLMULTI)
2015                         dev_set_allmulti(slave_dev, -1);
2016
2017                 bond_hw_addr_flush(bond_dev, slave_dev);
2018         }
2019
2020         bond_upper_dev_unlink(bond_dev, slave_dev);
2021
2022         slave_disable_netpoll(slave);
2023
2024         /* close slave before restoring its mac address */
2025         dev_close(slave_dev);
2026
2027         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2028                 /* restore original ("permanent") mac address */
2029                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2030                 addr.sa_family = slave_dev->type;
2031                 dev_set_mac_address(slave_dev, &addr);
2032         }
2033
2034         dev_set_mtu(slave_dev, slave->original_mtu);
2035
2036         slave_dev->priv_flags &= ~IFF_BONDING;
2037
2038         kfree(slave);
2039
2040         return 0;  /* deletion OK */
2041 }
2042
2043 /* A wrapper used because of ndo_del_link */
2044 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2045 {
2046         return __bond_release_one(bond_dev, slave_dev, false);
2047 }
2048
2049 /*
2050 * First release a slave and then destroy the bond if no more slaves are left.
2051 * Must be under rtnl_lock when this function is called.
2052 */
2053 static int  bond_release_and_destroy(struct net_device *bond_dev,
2054                                      struct net_device *slave_dev)
2055 {
2056         struct bonding *bond = netdev_priv(bond_dev);
2057         int ret;
2058
2059         ret = bond_release(bond_dev, slave_dev);
2060         if (ret == 0 && list_empty(&bond->slave_list)) {
2061                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2062                 pr_info("%s: destroying bond %s.\n",
2063                         bond_dev->name, bond_dev->name);
2064                 unregister_netdevice(bond_dev);
2065         }
2066         return ret;
2067 }
2068
2069 /*
2070  * This function changes the active slave to slave <slave_dev>.
2071  * It returns -EINVAL in the following cases.
2072  *  - <slave_dev> is not found in the list.
2073  *  - There is not active slave now.
2074  *  - <slave_dev> is already active.
2075  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2076  *  - <slave_dev> is not running.
2077  * In these cases, this function does nothing.
2078  * In the other cases, current_slave pointer is changed and 0 is returned.
2079  */
2080 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2081 {
2082         struct bonding *bond = netdev_priv(bond_dev);
2083         struct slave *old_active = NULL;
2084         struct slave *new_active = NULL;
2085         int res = 0;
2086
2087         if (!USES_PRIMARY(bond->params.mode))
2088                 return -EINVAL;
2089
2090         /* Verify that bond_dev is indeed the master of slave_dev */
2091         if (!(slave_dev->flags & IFF_SLAVE) ||
2092             !netdev_has_upper_dev(slave_dev, bond_dev))
2093                 return -EINVAL;
2094
2095         read_lock(&bond->lock);
2096
2097         old_active = bond->curr_active_slave;
2098         new_active = bond_get_slave_by_dev(bond, slave_dev);
2099         /*
2100          * Changing to the current active: do nothing; return success.
2101          */
2102         if (new_active && new_active == old_active) {
2103                 read_unlock(&bond->lock);
2104                 return 0;
2105         }
2106
2107         if (new_active &&
2108             old_active &&
2109             new_active->link == BOND_LINK_UP &&
2110             IS_UP(new_active->dev)) {
2111                 block_netpoll_tx();
2112                 write_lock_bh(&bond->curr_slave_lock);
2113                 bond_change_active_slave(bond, new_active);
2114                 write_unlock_bh(&bond->curr_slave_lock);
2115                 unblock_netpoll_tx();
2116         } else
2117                 res = -EINVAL;
2118
2119         read_unlock(&bond->lock);
2120
2121         return res;
2122 }
2123
2124 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2125 {
2126         struct bonding *bond = netdev_priv(bond_dev);
2127
2128         info->bond_mode = bond->params.mode;
2129         info->miimon = bond->params.miimon;
2130
2131         read_lock(&bond->lock);
2132         info->num_slaves = bond->slave_cnt;
2133         read_unlock(&bond->lock);
2134
2135         return 0;
2136 }
2137
2138 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2139 {
2140         struct bonding *bond = netdev_priv(bond_dev);
2141         int i = 0, res = -ENODEV;
2142         struct slave *slave;
2143
2144         read_lock(&bond->lock);
2145         bond_for_each_slave(bond, slave) {
2146                 if (i++ == (int)info->slave_id) {
2147                         res = 0;
2148                         strcpy(info->slave_name, slave->dev->name);
2149                         info->link = slave->link;
2150                         info->state = bond_slave_state(slave);
2151                         info->link_failure_count = slave->link_failure_count;
2152                         break;
2153                 }
2154         }
2155         read_unlock(&bond->lock);
2156
2157         return res;
2158 }
2159
2160 /*-------------------------------- Monitoring -------------------------------*/
2161
2162
2163 static int bond_miimon_inspect(struct bonding *bond)
2164 {
2165         int link_state, commit = 0;
2166         struct slave *slave;
2167         bool ignore_updelay;
2168
2169         ignore_updelay = !bond->curr_active_slave ? true : false;
2170
2171         bond_for_each_slave(bond, slave) {
2172                 slave->new_link = BOND_LINK_NOCHANGE;
2173
2174                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2175
2176                 switch (slave->link) {
2177                 case BOND_LINK_UP:
2178                         if (link_state)
2179                                 continue;
2180
2181                         slave->link = BOND_LINK_FAIL;
2182                         slave->delay = bond->params.downdelay;
2183                         if (slave->delay) {
2184                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2185                                         bond->dev->name,
2186                                         (bond->params.mode ==
2187                                          BOND_MODE_ACTIVEBACKUP) ?
2188                                         (bond_is_active_slave(slave) ?
2189                                          "active " : "backup ") : "",
2190                                         slave->dev->name,
2191                                         bond->params.downdelay * bond->params.miimon);
2192                         }
2193                         /*FALLTHRU*/
2194                 case BOND_LINK_FAIL:
2195                         if (link_state) {
2196                                 /*
2197                                  * recovered before downdelay expired
2198                                  */
2199                                 slave->link = BOND_LINK_UP;
2200                                 slave->jiffies = jiffies;
2201                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2202                                         bond->dev->name,
2203                                         (bond->params.downdelay - slave->delay) *
2204                                         bond->params.miimon,
2205                                         slave->dev->name);
2206                                 continue;
2207                         }
2208
2209                         if (slave->delay <= 0) {
2210                                 slave->new_link = BOND_LINK_DOWN;
2211                                 commit++;
2212                                 continue;
2213                         }
2214
2215                         slave->delay--;
2216                         break;
2217
2218                 case BOND_LINK_DOWN:
2219                         if (!link_state)
2220                                 continue;
2221
2222                         slave->link = BOND_LINK_BACK;
2223                         slave->delay = bond->params.updelay;
2224
2225                         if (slave->delay) {
2226                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2227                                         bond->dev->name, slave->dev->name,
2228                                         ignore_updelay ? 0 :
2229                                         bond->params.updelay *
2230                                         bond->params.miimon);
2231                         }
2232                         /*FALLTHRU*/
2233                 case BOND_LINK_BACK:
2234                         if (!link_state) {
2235                                 slave->link = BOND_LINK_DOWN;
2236                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2237                                         bond->dev->name,
2238                                         (bond->params.updelay - slave->delay) *
2239                                         bond->params.miimon,
2240                                         slave->dev->name);
2241
2242                                 continue;
2243                         }
2244
2245                         if (ignore_updelay)
2246                                 slave->delay = 0;
2247
2248                         if (slave->delay <= 0) {
2249                                 slave->new_link = BOND_LINK_UP;
2250                                 commit++;
2251                                 ignore_updelay = false;
2252                                 continue;
2253                         }
2254
2255                         slave->delay--;
2256                         break;
2257                 }
2258         }
2259
2260         return commit;
2261 }
2262
2263 static void bond_miimon_commit(struct bonding *bond)
2264 {
2265         struct slave *slave;
2266
2267         bond_for_each_slave(bond, slave) {
2268                 switch (slave->new_link) {
2269                 case BOND_LINK_NOCHANGE:
2270                         continue;
2271
2272                 case BOND_LINK_UP:
2273                         slave->link = BOND_LINK_UP;
2274                         slave->jiffies = jiffies;
2275
2276                         if (bond->params.mode == BOND_MODE_8023AD) {
2277                                 /* prevent it from being the active one */
2278                                 bond_set_backup_slave(slave);
2279                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2280                                 /* make it immediately active */
2281                                 bond_set_active_slave(slave);
2282                         } else if (slave != bond->primary_slave) {
2283                                 /* prevent it from being the active one */
2284                                 bond_set_backup_slave(slave);
2285                         }
2286
2287                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2288                                 bond->dev->name, slave->dev->name,
2289                                 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2290                                 slave->duplex ? "full" : "half");
2291
2292                         /* notify ad that the link status has changed */
2293                         if (bond->params.mode == BOND_MODE_8023AD)
2294                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2295
2296                         if (bond_is_lb(bond))
2297                                 bond_alb_handle_link_change(bond, slave,
2298                                                             BOND_LINK_UP);
2299
2300                         if (!bond->curr_active_slave ||
2301                             (slave == bond->primary_slave))
2302                                 goto do_failover;
2303
2304                         continue;
2305
2306                 case BOND_LINK_DOWN:
2307                         if (slave->link_failure_count < UINT_MAX)
2308                                 slave->link_failure_count++;
2309
2310                         slave->link = BOND_LINK_DOWN;
2311
2312                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2313                             bond->params.mode == BOND_MODE_8023AD)
2314                                 bond_set_slave_inactive_flags(slave);
2315
2316                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2317                                 bond->dev->name, slave->dev->name);
2318
2319                         if (bond->params.mode == BOND_MODE_8023AD)
2320                                 bond_3ad_handle_link_change(slave,
2321                                                             BOND_LINK_DOWN);
2322
2323                         if (bond_is_lb(bond))
2324                                 bond_alb_handle_link_change(bond, slave,
2325                                                             BOND_LINK_DOWN);
2326
2327                         if (slave == bond->curr_active_slave)
2328                                 goto do_failover;
2329
2330                         continue;
2331
2332                 default:
2333                         pr_err("%s: invalid new link %d on slave %s\n",
2334                                bond->dev->name, slave->new_link,
2335                                slave->dev->name);
2336                         slave->new_link = BOND_LINK_NOCHANGE;
2337
2338                         continue;
2339                 }
2340
2341 do_failover:
2342                 ASSERT_RTNL();
2343                 block_netpoll_tx();
2344                 write_lock_bh(&bond->curr_slave_lock);
2345                 bond_select_active_slave(bond);
2346                 write_unlock_bh(&bond->curr_slave_lock);
2347                 unblock_netpoll_tx();
2348         }
2349
2350         bond_set_carrier(bond);
2351 }
2352
2353 /*
2354  * bond_mii_monitor
2355  *
2356  * Really a wrapper that splits the mii monitor into two phases: an
2357  * inspection, then (if inspection indicates something needs to be done)
2358  * an acquisition of appropriate locks followed by a commit phase to
2359  * implement whatever link state changes are indicated.
2360  */
2361 void bond_mii_monitor(struct work_struct *work)
2362 {
2363         struct bonding *bond = container_of(work, struct bonding,
2364                                             mii_work.work);
2365         bool should_notify_peers = false;
2366         unsigned long delay;
2367
2368         read_lock(&bond->lock);
2369
2370         delay = msecs_to_jiffies(bond->params.miimon);
2371
2372         if (list_empty(&bond->slave_list))
2373                 goto re_arm;
2374
2375         should_notify_peers = bond_should_notify_peers(bond);
2376
2377         if (bond_miimon_inspect(bond)) {
2378                 read_unlock(&bond->lock);
2379
2380                 /* Race avoidance with bond_close cancel of workqueue */
2381                 if (!rtnl_trylock()) {
2382                         read_lock(&bond->lock);
2383                         delay = 1;
2384                         should_notify_peers = false;
2385                         goto re_arm;
2386                 }
2387
2388                 read_lock(&bond->lock);
2389
2390                 bond_miimon_commit(bond);
2391
2392                 read_unlock(&bond->lock);
2393                 rtnl_unlock();  /* might sleep, hold no other locks */
2394                 read_lock(&bond->lock);
2395         }
2396
2397 re_arm:
2398         if (bond->params.miimon)
2399                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2400
2401         read_unlock(&bond->lock);
2402
2403         if (should_notify_peers) {
2404                 if (!rtnl_trylock()) {
2405                         read_lock(&bond->lock);
2406                         bond->send_peer_notif++;
2407                         read_unlock(&bond->lock);
2408                         return;
2409                 }
2410                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2411                 rtnl_unlock();
2412         }
2413 }
2414
2415 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2416 {
2417         struct vlan_entry *vlan;
2418         struct net_device *vlan_dev;
2419
2420         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2421                 return 1;
2422
2423         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2424                 rcu_read_lock();
2425                 vlan_dev = __vlan_find_dev_deep(bond->dev, htons(ETH_P_8021Q),
2426                                                 vlan->vlan_id);
2427                 rcu_read_unlock();
2428                 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip))
2429                         return 1;
2430         }
2431
2432         return 0;
2433 }
2434
2435 /*
2436  * We go to the (large) trouble of VLAN tagging ARP frames because
2437  * switches in VLAN mode (especially if ports are configured as
2438  * "native" to a VLAN) might not pass non-tagged frames.
2439  */
2440 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2441 {
2442         struct sk_buff *skb;
2443
2444         pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op,
2445                  slave_dev->name, &dest_ip, &src_ip, vlan_id);
2446
2447         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2448                          NULL, slave_dev->dev_addr, NULL);
2449
2450         if (!skb) {
2451                 pr_err("ARP packet allocation failed\n");
2452                 return;
2453         }
2454         if (vlan_id) {
2455                 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2456                 if (!skb) {
2457                         pr_err("failed to insert VLAN tag\n");
2458                         return;
2459                 }
2460         }
2461         arp_xmit(skb);
2462 }
2463
2464
2465 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2466 {
2467         int i, vlan_id;
2468         __be32 *targets = bond->params.arp_targets;
2469         struct vlan_entry *vlan;
2470         struct net_device *vlan_dev = NULL;
2471         struct rtable *rt;
2472
2473         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2474                 __be32 addr;
2475                 if (!targets[i])
2476                         break;
2477                 pr_debug("basa: target %pI4\n", &targets[i]);
2478                 if (!bond_vlan_used(bond)) {
2479                         pr_debug("basa: empty vlan: arp_send\n");
2480                         addr = bond_confirm_addr(bond->dev, targets[i], 0);
2481                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2482                                       addr, 0);
2483                         continue;
2484                 }
2485
2486                 /*
2487                  * If VLANs are configured, we do a route lookup to
2488                  * determine which VLAN interface would be used, so we
2489                  * can tag the ARP with the proper VLAN tag.
2490                  */
2491                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2492                                      RTO_ONLINK, 0);
2493                 if (IS_ERR(rt)) {
2494                         if (net_ratelimit()) {
2495                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2496                                            bond->dev->name, &targets[i]);
2497                         }
2498                         continue;
2499                 }
2500
2501                 /*
2502                  * This target is not on a VLAN
2503                  */
2504                 if (rt->dst.dev == bond->dev) {
2505                         ip_rt_put(rt);
2506                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2507                         addr = bond_confirm_addr(bond->dev, targets[i], 0);
2508                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2509                                       addr, 0);
2510                         continue;
2511                 }
2512
2513                 vlan_id = 0;
2514                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2515                         rcu_read_lock();
2516                         vlan_dev = __vlan_find_dev_deep(bond->dev,
2517                                                         htons(ETH_P_8021Q),
2518                                                         vlan->vlan_id);
2519                         rcu_read_unlock();
2520                         if (vlan_dev == rt->dst.dev) {
2521                                 vlan_id = vlan->vlan_id;
2522                                 pr_debug("basa: vlan match on %s %d\n",
2523                                        vlan_dev->name, vlan_id);
2524                                 break;
2525                         }
2526                 }
2527
2528                 if (vlan_id && vlan_dev) {
2529                         ip_rt_put(rt);
2530                         addr = bond_confirm_addr(vlan_dev, targets[i], 0);
2531                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2532                                       addr, vlan_id);
2533                         continue;
2534                 }
2535
2536                 if (net_ratelimit()) {
2537                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2538                                    bond->dev->name, &targets[i],
2539                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2540                 }
2541                 ip_rt_put(rt);
2542         }
2543 }
2544
2545 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2546 {
2547         int i;
2548
2549         if (!sip || !bond_has_this_ip(bond, tip)) {
2550                 pr_debug("bva: sip %pI4 tip %pI4 not found\n", &sip, &tip);
2551                 return;
2552         }
2553
2554         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2555         if (i == -1) {
2556                 pr_debug("bva: sip %pI4 not found in targets\n", &sip);
2557                 return;
2558         }
2559         slave->last_arp_rx = jiffies;
2560         slave->target_last_arp_rx[i] = jiffies;
2561 }
2562
2563 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2564                         struct slave *slave)
2565 {
2566         struct arphdr *arp = (struct arphdr *)skb->data;
2567         unsigned char *arp_ptr;
2568         __be32 sip, tip;
2569         int alen;
2570
2571         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2572                 return RX_HANDLER_ANOTHER;
2573
2574         read_lock(&bond->lock);
2575
2576         if (!slave_do_arp_validate(bond, slave))
2577                 goto out_unlock;
2578
2579         alen = arp_hdr_len(bond->dev);
2580
2581         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2582                  bond->dev->name, skb->dev->name);
2583
2584         if (alen > skb_headlen(skb)) {
2585                 arp = kmalloc(alen, GFP_ATOMIC);
2586                 if (!arp)
2587                         goto out_unlock;
2588                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2589                         goto out_unlock;
2590         }
2591
2592         if (arp->ar_hln != bond->dev->addr_len ||
2593             skb->pkt_type == PACKET_OTHERHOST ||
2594             skb->pkt_type == PACKET_LOOPBACK ||
2595             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2596             arp->ar_pro != htons(ETH_P_IP) ||
2597             arp->ar_pln != 4)
2598                 goto out_unlock;
2599
2600         arp_ptr = (unsigned char *)(arp + 1);
2601         arp_ptr += bond->dev->addr_len;
2602         memcpy(&sip, arp_ptr, 4);
2603         arp_ptr += 4 + bond->dev->addr_len;
2604         memcpy(&tip, arp_ptr, 4);
2605
2606         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2607                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2608                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2609                  &sip, &tip);
2610
2611         /*
2612          * Backup slaves won't see the ARP reply, but do come through
2613          * here for each ARP probe (so we swap the sip/tip to validate
2614          * the probe).  In a "redundant switch, common router" type of
2615          * configuration, the ARP probe will (hopefully) travel from
2616          * the active, through one switch, the router, then the other
2617          * switch before reaching the backup.
2618          *
2619          * We 'trust' the arp requests if there is an active slave and
2620          * it received valid arp reply(s) after it became active. This
2621          * is done to avoid endless looping when we can't reach the
2622          * arp_ip_target and fool ourselves with our own arp requests.
2623          */
2624         if (bond_is_active_slave(slave))
2625                 bond_validate_arp(bond, slave, sip, tip);
2626         else if (bond->curr_active_slave &&
2627                  time_after(slave_last_rx(bond, bond->curr_active_slave),
2628                             bond->curr_active_slave->jiffies))
2629                 bond_validate_arp(bond, slave, tip, sip);
2630
2631 out_unlock:
2632         read_unlock(&bond->lock);
2633         if (arp != (struct arphdr *)skb->data)
2634                 kfree(arp);
2635         return RX_HANDLER_ANOTHER;
2636 }
2637
2638 /*
2639  * this function is called regularly to monitor each slave's link
2640  * ensuring that traffic is being sent and received when arp monitoring
2641  * is used in load-balancing mode. if the adapter has been dormant, then an
2642  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2643  * arp monitoring in active backup mode.
2644  */
2645 void bond_loadbalance_arp_mon(struct work_struct *work)
2646 {
2647         struct bonding *bond = container_of(work, struct bonding,
2648                                             arp_work.work);
2649         struct slave *slave, *oldcurrent;
2650         int do_failover = 0;
2651         int delta_in_ticks, extra_ticks;
2652
2653         read_lock(&bond->lock);
2654
2655         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2656         extra_ticks = delta_in_ticks / 2;
2657
2658         if (list_empty(&bond->slave_list))
2659                 goto re_arm;
2660
2661         oldcurrent = bond->curr_active_slave;
2662         /* see if any of the previous devices are up now (i.e. they have
2663          * xmt and rcv traffic). the curr_active_slave does not come into
2664          * the picture unless it is null. also, slave->jiffies is not needed
2665          * here because we send an arp on each slave and give a slave as
2666          * long as it needs to get the tx/rx within the delta.
2667          * TODO: what about up/down delay in arp mode? it wasn't here before
2668          *       so it can wait
2669          */
2670         bond_for_each_slave(bond, slave) {
2671                 unsigned long trans_start = dev_trans_start(slave->dev);
2672
2673                 if (slave->link != BOND_LINK_UP) {
2674                         if (time_in_range(jiffies,
2675                                 trans_start - delta_in_ticks,
2676                                 trans_start + delta_in_ticks + extra_ticks) &&
2677                             time_in_range(jiffies,
2678                                 slave->dev->last_rx - delta_in_ticks,
2679                                 slave->dev->last_rx + delta_in_ticks + extra_ticks)) {
2680
2681                                 slave->link  = BOND_LINK_UP;
2682                                 bond_set_active_slave(slave);
2683
2684                                 /* primary_slave has no meaning in round-robin
2685                                  * mode. the window of a slave being up and
2686                                  * curr_active_slave being null after enslaving
2687                                  * is closed.
2688                                  */
2689                                 if (!oldcurrent) {
2690                                         pr_info("%s: link status definitely up for interface %s, ",
2691                                                 bond->dev->name,
2692                                                 slave->dev->name);
2693                                         do_failover = 1;
2694                                 } else {
2695                                         pr_info("%s: interface %s is now up\n",
2696                                                 bond->dev->name,
2697                                                 slave->dev->name);
2698                                 }
2699                         }
2700                 } else {
2701                         /* slave->link == BOND_LINK_UP */
2702
2703                         /* not all switches will respond to an arp request
2704                          * when the source ip is 0, so don't take the link down
2705                          * if we don't know our ip yet
2706                          */
2707                         if (!time_in_range(jiffies,
2708                                 trans_start - delta_in_ticks,
2709                                 trans_start + 2 * delta_in_ticks + extra_ticks) ||
2710                             !time_in_range(jiffies,
2711                                 slave->dev->last_rx - delta_in_ticks,
2712                                 slave->dev->last_rx + 2 * delta_in_ticks + extra_ticks)) {
2713
2714                                 slave->link  = BOND_LINK_DOWN;
2715                                 bond_set_backup_slave(slave);
2716
2717                                 if (slave->link_failure_count < UINT_MAX)
2718                                         slave->link_failure_count++;
2719
2720                                 pr_info("%s: interface %s is now down.\n",
2721                                         bond->dev->name,
2722                                         slave->dev->name);
2723
2724                                 if (slave == oldcurrent)
2725                                         do_failover = 1;
2726                         }
2727                 }
2728
2729                 /* note: if switch is in round-robin mode, all links
2730                  * must tx arp to ensure all links rx an arp - otherwise
2731                  * links may oscillate or not come up at all; if switch is
2732                  * in something like xor mode, there is nothing we can
2733                  * do - all replies will be rx'ed on same link causing slaves
2734                  * to be unstable during low/no traffic periods
2735                  */
2736                 if (IS_UP(slave->dev))
2737                         bond_arp_send_all(bond, slave);
2738         }
2739
2740         if (do_failover) {
2741                 block_netpoll_tx();
2742                 write_lock_bh(&bond->curr_slave_lock);
2743
2744                 bond_select_active_slave(bond);
2745
2746                 write_unlock_bh(&bond->curr_slave_lock);
2747                 unblock_netpoll_tx();
2748         }
2749
2750 re_arm:
2751         if (bond->params.arp_interval)
2752                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2753
2754         read_unlock(&bond->lock);
2755 }
2756
2757 /*
2758  * Called to inspect slaves for active-backup mode ARP monitor link state
2759  * changes.  Sets new_link in slaves to specify what action should take
2760  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2761  * to link states must be committed.
2762  *
2763  * Called with bond->lock held for read.
2764  */
2765 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2766 {
2767         unsigned long trans_start;
2768         struct slave *slave;
2769         int extra_ticks;
2770         int commit = 0;
2771
2772         /* All the time comparisons below need some extra time. Otherwise, on
2773          * fast networks the ARP probe/reply may arrive within the same jiffy
2774          * as it was sent.  Then, the next time the ARP monitor is run, one
2775          * arp_interval will already have passed in the comparisons.
2776          */
2777         extra_ticks = delta_in_ticks / 2;
2778
2779         bond_for_each_slave(bond, slave) {
2780                 slave->new_link = BOND_LINK_NOCHANGE;
2781
2782                 if (slave->link != BOND_LINK_UP) {
2783                         if (time_in_range(jiffies,
2784                                 slave_last_rx(bond, slave) - delta_in_ticks,
2785                                 slave_last_rx(bond, slave) + delta_in_ticks + extra_ticks)) {
2786
2787                                 slave->new_link = BOND_LINK_UP;
2788                                 commit++;
2789                         }
2790
2791                         continue;
2792                 }
2793
2794                 /*
2795                  * Give slaves 2*delta after being enslaved or made
2796                  * active.  This avoids bouncing, as the last receive
2797                  * times need a full ARP monitor cycle to be updated.
2798                  */
2799                 if (time_in_range(jiffies,
2800                                   slave->jiffies - delta_in_ticks,
2801                                   slave->jiffies + 2 * delta_in_ticks + extra_ticks))
2802                         continue;
2803
2804                 /*
2805                  * Backup slave is down if:
2806                  * - No current_arp_slave AND
2807                  * - more than 3*delta since last receive AND
2808                  * - the bond has an IP address
2809                  *
2810                  * Note: a non-null current_arp_slave indicates
2811                  * the curr_active_slave went down and we are
2812                  * searching for a new one; under this condition
2813                  * we only take the curr_active_slave down - this
2814                  * gives each slave a chance to tx/rx traffic
2815                  * before being taken out
2816                  */
2817                 if (!bond_is_active_slave(slave) &&
2818                     !bond->current_arp_slave &&
2819                     !time_in_range(jiffies,
2820                         slave_last_rx(bond, slave) - delta_in_ticks,
2821                         slave_last_rx(bond, slave) + 3 * delta_in_ticks + extra_ticks)) {
2822
2823                         slave->new_link = BOND_LINK_DOWN;
2824                         commit++;
2825                 }
2826
2827                 /*
2828                  * Active slave is down if:
2829                  * - more than 2*delta since transmitting OR
2830                  * - (more than 2*delta since receive AND
2831                  *    the bond has an IP address)
2832                  */
2833                 trans_start = dev_trans_start(slave->dev);
2834                 if (bond_is_active_slave(slave) &&
2835                     (!time_in_range(jiffies,
2836                         trans_start - delta_in_ticks,
2837                         trans_start + 2 * delta_in_ticks + extra_ticks) ||
2838                      !time_in_range(jiffies,
2839                         slave_last_rx(bond, slave) - delta_in_ticks,
2840                         slave_last_rx(bond, slave) + 2 * delta_in_ticks + extra_ticks))) {
2841
2842                         slave->new_link = BOND_LINK_DOWN;
2843                         commit++;
2844                 }
2845         }
2846
2847         return commit;
2848 }
2849
2850 /*
2851  * Called to commit link state changes noted by inspection step of
2852  * active-backup mode ARP monitor.
2853  *
2854  * Called with RTNL and bond->lock for read.
2855  */
2856 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2857 {
2858         unsigned long trans_start;
2859         struct slave *slave;
2860
2861         bond_for_each_slave(bond, slave) {
2862                 switch (slave->new_link) {
2863                 case BOND_LINK_NOCHANGE:
2864                         continue;
2865
2866                 case BOND_LINK_UP:
2867                         trans_start = dev_trans_start(slave->dev);
2868                         if ((!bond->curr_active_slave &&
2869                              time_in_range(jiffies,
2870                                            trans_start - delta_in_ticks,
2871                                            trans_start + delta_in_ticks + delta_in_ticks / 2)) ||
2872                             bond->curr_active_slave != slave) {
2873                                 slave->link = BOND_LINK_UP;
2874                                 if (bond->current_arp_slave) {
2875                                         bond_set_slave_inactive_flags(
2876                                                 bond->current_arp_slave);
2877                                         bond->current_arp_slave = NULL;
2878                                 }
2879
2880                                 pr_info("%s: link status definitely up for interface %s.\n",
2881                                         bond->dev->name, slave->dev->name);
2882
2883                                 if (!bond->curr_active_slave ||
2884                                     (slave == bond->primary_slave))
2885                                         goto do_failover;
2886
2887                         }
2888
2889                         continue;
2890
2891                 case BOND_LINK_DOWN:
2892                         if (slave->link_failure_count < UINT_MAX)
2893                                 slave->link_failure_count++;
2894
2895                         slave->link = BOND_LINK_DOWN;
2896                         bond_set_slave_inactive_flags(slave);
2897
2898                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2899                                 bond->dev->name, slave->dev->name);
2900
2901                         if (slave == bond->curr_active_slave) {
2902                                 bond->current_arp_slave = NULL;
2903                                 goto do_failover;
2904                         }
2905
2906                         continue;
2907
2908                 default:
2909                         pr_err("%s: impossible: new_link %d on slave %s\n",
2910                                bond->dev->name, slave->new_link,
2911                                slave->dev->name);
2912                         continue;
2913                 }
2914
2915 do_failover:
2916                 ASSERT_RTNL();
2917                 block_netpoll_tx();
2918                 write_lock_bh(&bond->curr_slave_lock);
2919                 bond_select_active_slave(bond);
2920                 write_unlock_bh(&bond->curr_slave_lock);
2921                 unblock_netpoll_tx();
2922         }
2923
2924         bond_set_carrier(bond);
2925 }
2926
2927 /*
2928  * Send ARP probes for active-backup mode ARP monitor.
2929  *
2930  * Called with bond->lock held for read.
2931  */
2932 static void bond_ab_arp_probe(struct bonding *bond)
2933 {
2934         struct slave *slave, *next_slave;
2935         int i;
2936
2937         read_lock(&bond->curr_slave_lock);
2938
2939         if (bond->current_arp_slave && bond->curr_active_slave)
2940                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
2941                         bond->current_arp_slave->dev->name,
2942                         bond->curr_active_slave->dev->name);
2943
2944         if (bond->curr_active_slave) {
2945                 bond_arp_send_all(bond, bond->curr_active_slave);
2946                 read_unlock(&bond->curr_slave_lock);
2947                 return;
2948         }
2949
2950         read_unlock(&bond->curr_slave_lock);
2951
2952         /* if we don't have a curr_active_slave, search for the next available
2953          * backup slave from the current_arp_slave and make it the candidate
2954          * for becoming the curr_active_slave
2955          */
2956
2957         if (!bond->current_arp_slave) {
2958                 bond->current_arp_slave = bond_first_slave(bond);
2959                 if (!bond->current_arp_slave)
2960                         return;
2961         }
2962
2963         bond_set_slave_inactive_flags(bond->current_arp_slave);
2964
2965         /* search for next candidate */
2966         next_slave = bond_next_slave(bond, bond->current_arp_slave);
2967         bond_for_each_slave_from(bond, slave, i, next_slave) {
2968                 if (IS_UP(slave->dev)) {
2969                         slave->link = BOND_LINK_BACK;
2970                         bond_set_slave_active_flags(slave);
2971                         bond_arp_send_all(bond, slave);
2972                         slave->jiffies = jiffies;
2973                         bond->current_arp_slave = slave;
2974                         break;
2975                 }
2976
2977                 /* if the link state is up at this point, we
2978                  * mark it down - this can happen if we have
2979                  * simultaneous link failures and
2980                  * reselect_active_interface doesn't make this
2981                  * one the current slave so it is still marked
2982                  * up when it is actually down
2983                  */
2984                 if (slave->link == BOND_LINK_UP) {
2985                         slave->link = BOND_LINK_DOWN;
2986                         if (slave->link_failure_count < UINT_MAX)
2987                                 slave->link_failure_count++;
2988
2989                         bond_set_slave_inactive_flags(slave);
2990
2991                         pr_info("%s: backup interface %s is now down.\n",
2992                                 bond->dev->name, slave->dev->name);
2993                 }
2994         }
2995 }
2996
2997 void bond_activebackup_arp_mon(struct work_struct *work)
2998 {
2999         struct bonding *bond = container_of(work, struct bonding,
3000                                             arp_work.work);
3001         bool should_notify_peers = false;
3002         int delta_in_ticks;
3003
3004         read_lock(&bond->lock);
3005
3006         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3007
3008         if (list_empty(&bond->slave_list))
3009                 goto re_arm;
3010
3011         should_notify_peers = bond_should_notify_peers(bond);
3012
3013         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3014                 read_unlock(&bond->lock);
3015
3016                 /* Race avoidance with bond_close flush of workqueue */
3017                 if (!rtnl_trylock()) {
3018                         read_lock(&bond->lock);
3019                         delta_in_ticks = 1;
3020                         should_notify_peers = false;
3021                         goto re_arm;
3022                 }
3023
3024                 read_lock(&bond->lock);
3025
3026                 bond_ab_arp_commit(bond, delta_in_ticks);
3027
3028                 read_unlock(&bond->lock);
3029                 rtnl_unlock();
3030                 read_lock(&bond->lock);
3031         }
3032
3033         bond_ab_arp_probe(bond);
3034
3035 re_arm:
3036         if (bond->params.arp_interval)
3037                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3038
3039         read_unlock(&bond->lock);
3040
3041         if (should_notify_peers) {
3042                 if (!rtnl_trylock()) {
3043                         read_lock(&bond->lock);
3044                         bond->send_peer_notif++;
3045                         read_unlock(&bond->lock);
3046                         return;
3047                 }
3048                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
3049                 rtnl_unlock();
3050         }
3051 }
3052
3053 /*-------------------------- netdev event handling --------------------------*/
3054
3055 /*
3056  * Change device name
3057  */
3058 static int bond_event_changename(struct bonding *bond)
3059 {
3060         bond_remove_proc_entry(bond);
3061         bond_create_proc_entry(bond);
3062
3063         bond_debug_reregister(bond);
3064
3065         return NOTIFY_DONE;
3066 }
3067
3068 static int bond_master_netdev_event(unsigned long event,
3069                                     struct net_device *bond_dev)
3070 {
3071         struct bonding *event_bond = netdev_priv(bond_dev);
3072
3073         switch (event) {
3074         case NETDEV_CHANGENAME:
3075                 return bond_event_changename(event_bond);
3076         case NETDEV_UNREGISTER:
3077                 bond_remove_proc_entry(event_bond);
3078                 break;
3079         case NETDEV_REGISTER:
3080                 bond_create_proc_entry(event_bond);
3081                 break;
3082         default:
3083                 break;
3084         }
3085
3086         return NOTIFY_DONE;
3087 }
3088
3089 static int bond_slave_netdev_event(unsigned long event,
3090                                    struct net_device *slave_dev)
3091 {
3092         struct slave *slave = bond_slave_get_rtnl(slave_dev);
3093         struct bonding *bond;
3094         struct net_device *bond_dev;
3095         u32 old_speed;
3096         u8 old_duplex;
3097
3098         /* A netdev event can be generated while enslaving a device
3099          * before netdev_rx_handler_register is called in which case
3100          * slave will be NULL
3101          */
3102         if (!slave)
3103                 return NOTIFY_DONE;
3104         bond_dev = slave->bond->dev;
3105         bond = slave->bond;
3106
3107         switch (event) {
3108         case NETDEV_UNREGISTER:
3109                 if (bond_dev->type != ARPHRD_ETHER)
3110                         bond_release_and_destroy(bond_dev, slave_dev);
3111                 else
3112                         bond_release(bond_dev, slave_dev);
3113                 break;
3114         case NETDEV_UP:
3115         case NETDEV_CHANGE:
3116                 old_speed = slave->speed;
3117                 old_duplex = slave->duplex;
3118
3119                 bond_update_speed_duplex(slave);
3120
3121                 if (bond->params.mode == BOND_MODE_8023AD) {
3122                         if (old_speed != slave->speed)
3123                                 bond_3ad_adapter_speed_changed(slave);
3124                         if (old_duplex != slave->duplex)
3125                                 bond_3ad_adapter_duplex_changed(slave);
3126                 }
3127                 break;
3128         case NETDEV_DOWN:
3129                 /*
3130                  * ... Or is it this?
3131                  */
3132                 break;
3133         case NETDEV_CHANGEMTU:
3134                 /*
3135                  * TODO: Should slaves be allowed to
3136                  * independently alter their MTU?  For
3137                  * an active-backup bond, slaves need
3138                  * not be the same type of device, so
3139                  * MTUs may vary.  For other modes,
3140                  * slaves arguably should have the
3141                  * same MTUs. To do this, we'd need to
3142                  * take over the slave's change_mtu
3143                  * function for the duration of their
3144                  * servitude.
3145                  */
3146                 break;
3147         case NETDEV_CHANGENAME:
3148                 /*
3149                  * TODO: handle changing the primary's name
3150                  */
3151                 break;
3152         case NETDEV_FEAT_CHANGE:
3153                 bond_compute_features(bond);
3154                 break;
3155         case NETDEV_RESEND_IGMP:
3156                 /* Propagate to master device */
3157                 call_netdevice_notifiers(event, slave->bond->dev);
3158                 break;
3159         default:
3160                 break;
3161         }
3162
3163         return NOTIFY_DONE;
3164 }
3165
3166 /*
3167  * bond_netdev_event: handle netdev notifier chain events.
3168  *
3169  * This function receives events for the netdev chain.  The caller (an
3170  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3171  * locks for us to safely manipulate the slave devices (RTNL lock,
3172  * dev_probe_lock).
3173  */
3174 static int bond_netdev_event(struct notifier_block *this,
3175                              unsigned long event, void *ptr)
3176 {
3177         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3178
3179         pr_debug("event_dev: %s, event: %lx\n",
3180                  event_dev ? event_dev->name : "None",
3181                  event);
3182
3183         if (!(event_dev->priv_flags & IFF_BONDING))
3184                 return NOTIFY_DONE;
3185
3186         if (event_dev->flags & IFF_MASTER) {
3187                 pr_debug("IFF_MASTER\n");
3188                 return bond_master_netdev_event(event, event_dev);
3189         }
3190
3191         if (event_dev->flags & IFF_SLAVE) {
3192                 pr_debug("IFF_SLAVE\n");
3193                 return bond_slave_netdev_event(event, event_dev);
3194         }
3195
3196         return NOTIFY_DONE;
3197 }
3198
3199 static struct notifier_block bond_netdev_notifier = {
3200         .notifier_call = bond_netdev_event,
3201 };
3202
3203 /*---------------------------- Hashing Policies -----------------------------*/
3204
3205 /*
3206  * Hash for the output device based upon layer 2 data
3207  */
3208 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3209 {
3210         struct ethhdr *data = (struct ethhdr *)skb->data;
3211
3212         if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
3213                 return (data->h_dest[5] ^ data->h_source[5]) % count;
3214
3215         return 0;
3216 }
3217
3218 /*
3219  * Hash for the output device based upon layer 2 and layer 3 data. If
3220  * the packet is not IP, fall back on bond_xmit_hash_policy_l2()
3221  */
3222 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3223 {
3224         const struct ethhdr *data;
3225         const struct iphdr *iph;
3226         const struct ipv6hdr *ipv6h;
3227         u32 v6hash;
3228         const __be32 *s, *d;
3229
3230         if (skb->protocol == htons(ETH_P_IP) &&
3231             pskb_network_may_pull(skb, sizeof(*iph))) {
3232                 iph = ip_hdr(skb);
3233                 data = (struct ethhdr *)skb->data;
3234                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3235                         (data->h_dest[5] ^ data->h_source[5])) % count;
3236         } else if (skb->protocol == htons(ETH_P_IPV6) &&
3237                    pskb_network_may_pull(skb, sizeof(*ipv6h))) {
3238                 ipv6h = ipv6_hdr(skb);
3239                 data = (struct ethhdr *)skb->data;
3240                 s = &ipv6h->saddr.s6_addr32[0];
3241                 d = &ipv6h->daddr.s6_addr32[0];
3242                 v6hash = (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3243                 v6hash ^= (v6hash >> 24) ^ (v6hash >> 16) ^ (v6hash >> 8);
3244                 return (v6hash ^ data->h_dest[5] ^ data->h_source[5]) % count;
3245         }
3246
3247         return bond_xmit_hash_policy_l2(skb, count);
3248 }
3249
3250 /*
3251  * Hash for the output device based upon layer 3 and layer 4 data. If
3252  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3253  * altogether not IP, fall back on bond_xmit_hash_policy_l2()
3254  */
3255 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3256 {
3257         u32 layer4_xor = 0;
3258         const struct iphdr *iph;
3259         const struct ipv6hdr *ipv6h;
3260         const __be32 *s, *d;
3261         const __be16 *l4 = NULL;
3262         __be16 _l4[2];
3263         int noff = skb_network_offset(skb);
3264         int poff;
3265
3266         if (skb->protocol == htons(ETH_P_IP) &&
3267             pskb_may_pull(skb, noff + sizeof(*iph))) {
3268                 iph = ip_hdr(skb);
3269                 poff = proto_ports_offset(iph->protocol);
3270
3271                 if (!ip_is_fragment(iph) && poff >= 0) {
3272                         l4 = skb_header_pointer(skb, noff + (iph->ihl << 2) + poff,
3273                                                 sizeof(_l4), &_l4);
3274                         if (l4)
3275                                 layer4_xor = ntohs(l4[0] ^ l4[1]);
3276                 }
3277                 return (layer4_xor ^
3278                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3279         } else if (skb->protocol == htons(ETH_P_IPV6) &&
3280                    pskb_may_pull(skb, noff + sizeof(*ipv6h))) {
3281                 ipv6h = ipv6_hdr(skb);
3282                 poff = proto_ports_offset(ipv6h->nexthdr);
3283                 if (poff >= 0) {
3284                         l4 = skb_header_pointer(skb, noff + sizeof(*ipv6h) + poff,
3285                                                 sizeof(_l4), &_l4);
3286                         if (l4)
3287                                 layer4_xor = ntohs(l4[0] ^ l4[1]);
3288                 }
3289                 s = &ipv6h->saddr.s6_addr32[0];
3290                 d = &ipv6h->daddr.s6_addr32[0];
3291                 layer4_xor ^= (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3292                 layer4_xor ^= (layer4_xor >> 24) ^ (layer4_xor >> 16) ^
3293                                (layer4_xor >> 8);
3294                 return layer4_xor % count;
3295         }
3296
3297         return bond_xmit_hash_policy_l2(skb, count);
3298 }
3299
3300 /*-------------------------- Device entry points ----------------------------*/
3301
3302 static void bond_work_init_all(struct bonding *bond)
3303 {
3304         INIT_DELAYED_WORK(&bond->mcast_work,
3305                           bond_resend_igmp_join_requests_delayed);
3306         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3307         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3308         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3309                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3310         else
3311                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3312         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3313 }
3314
3315 static void bond_work_cancel_all(struct bonding *bond)
3316 {
3317         cancel_delayed_work_sync(&bond->mii_work);
3318         cancel_delayed_work_sync(&bond->arp_work);
3319         cancel_delayed_work_sync(&bond->alb_work);
3320         cancel_delayed_work_sync(&bond->ad_work);
3321         cancel_delayed_work_sync(&bond->mcast_work);
3322 }
3323
3324 static int bond_open(struct net_device *bond_dev)
3325 {
3326         struct bonding *bond = netdev_priv(bond_dev);
3327         struct slave *slave;
3328
3329         /* reset slave->backup and slave->inactive */
3330         read_lock(&bond->lock);
3331         if (!list_empty(&bond->slave_list)) {
3332                 read_lock(&bond->curr_slave_lock);
3333                 bond_for_each_slave(bond, slave) {
3334                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3335                                 && (slave != bond->curr_active_slave)) {
3336                                 bond_set_slave_inactive_flags(slave);
3337                         } else {
3338                                 bond_set_slave_active_flags(slave);
3339                         }
3340                 }
3341                 read_unlock(&bond->curr_slave_lock);
3342         }
3343         read_unlock(&bond->lock);
3344
3345         bond_work_init_all(bond);
3346
3347         if (bond_is_lb(bond)) {
3348                 /* bond_alb_initialize must be called before the timer
3349                  * is started.
3350                  */
3351                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3352                         return -ENOMEM;
3353                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3354         }
3355
3356         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3357                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3358
3359         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3360                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3361                 if (bond->params.arp_validate)
3362                         bond->recv_probe = bond_arp_rcv;
3363         }
3364
3365         if (bond->params.mode == BOND_MODE_8023AD) {
3366                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3367                 /* register to receive LACPDUs */
3368                 bond->recv_probe = bond_3ad_lacpdu_recv;
3369                 bond_3ad_initiate_agg_selection(bond, 1);
3370         }
3371
3372         return 0;
3373 }
3374
3375 static int bond_close(struct net_device *bond_dev)
3376 {
3377         struct bonding *bond = netdev_priv(bond_dev);
3378
3379         write_lock_bh(&bond->lock);
3380         bond->send_peer_notif = 0;
3381         write_unlock_bh(&bond->lock);
3382
3383         bond_work_cancel_all(bond);
3384         if (bond_is_lb(bond)) {
3385                 /* Must be called only after all
3386                  * slaves have been released
3387                  */
3388                 bond_alb_deinitialize(bond);
3389         }
3390         bond->recv_probe = NULL;
3391
3392         return 0;
3393 }
3394
3395 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3396                                                 struct rtnl_link_stats64 *stats)
3397 {
3398         struct bonding *bond = netdev_priv(bond_dev);
3399         struct rtnl_link_stats64 temp;
3400         struct slave *slave;
3401
3402         memset(stats, 0, sizeof(*stats));
3403
3404         read_lock_bh(&bond->lock);
3405         bond_for_each_slave(bond, slave) {
3406                 const struct rtnl_link_stats64 *sstats =
3407                         dev_get_stats(slave->dev, &temp);
3408
3409                 stats->rx_packets += sstats->rx_packets;
3410                 stats->rx_bytes += sstats->rx_bytes;
3411                 stats->rx_errors += sstats->rx_errors;
3412                 stats->rx_dropped += sstats->rx_dropped;
3413
3414                 stats->tx_packets += sstats->tx_packets;
3415                 stats->tx_bytes += sstats->tx_bytes;
3416                 stats->tx_errors += sstats->tx_errors;
3417                 stats->tx_dropped += sstats->tx_dropped;
3418
3419                 stats->multicast += sstats->multicast;
3420                 stats->collisions += sstats->collisions;
3421
3422                 stats->rx_length_errors += sstats->rx_length_errors;
3423                 stats->rx_over_errors += sstats->rx_over_errors;
3424                 stats->rx_crc_errors += sstats->rx_crc_errors;
3425                 stats->rx_frame_errors += sstats->rx_frame_errors;
3426                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3427                 stats->rx_missed_errors += sstats->rx_missed_errors;
3428
3429                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3430                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3431                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3432                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3433                 stats->tx_window_errors += sstats->tx_window_errors;
3434         }
3435         read_unlock_bh(&bond->lock);
3436
3437         return stats;
3438 }
3439
3440 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3441 {
3442         struct net_device *slave_dev = NULL;
3443         struct ifbond k_binfo;
3444         struct ifbond __user *u_binfo = NULL;
3445         struct ifslave k_sinfo;
3446         struct ifslave __user *u_sinfo = NULL;
3447         struct mii_ioctl_data *mii = NULL;
3448         struct net *net;
3449         int res = 0;
3450
3451         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3452
3453         switch (cmd) {
3454         case SIOCGMIIPHY:
3455                 mii = if_mii(ifr);
3456                 if (!mii)
3457                         return -EINVAL;
3458
3459                 mii->phy_id = 0;
3460                 /* Fall Through */
3461         case SIOCGMIIREG:
3462                 /*
3463                  * We do this again just in case we were called by SIOCGMIIREG
3464                  * instead of SIOCGMIIPHY.
3465                  */
3466                 mii = if_mii(ifr);
3467                 if (!mii)
3468                         return -EINVAL;
3469
3470
3471                 if (mii->reg_num == 1) {
3472                         struct bonding *bond = netdev_priv(bond_dev);
3473                         mii->val_out = 0;
3474                         read_lock(&bond->lock);
3475                         read_lock(&bond->curr_slave_lock);
3476                         if (netif_carrier_ok(bond->dev))
3477                                 mii->val_out = BMSR_LSTATUS;
3478
3479                         read_unlock(&bond->curr_slave_lock);
3480                         read_unlock(&bond->lock);
3481                 }
3482
3483                 return 0;
3484         case BOND_INFO_QUERY_OLD:
3485         case SIOCBONDINFOQUERY:
3486                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3487
3488                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3489                         return -EFAULT;
3490
3491                 res = bond_info_query(bond_dev, &k_binfo);
3492                 if (res == 0 &&
3493                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3494                         return -EFAULT;
3495
3496                 return res;
3497         case BOND_SLAVE_INFO_QUERY_OLD:
3498         case SIOCBONDSLAVEINFOQUERY:
3499                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3500
3501                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3502                         return -EFAULT;
3503
3504                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3505                 if (res == 0 &&
3506                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3507                         return -EFAULT;
3508
3509                 return res;
3510         default:
3511                 /* Go on */
3512                 break;
3513         }
3514
3515         net = dev_net(bond_dev);
3516
3517         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3518                 return -EPERM;
3519
3520         slave_dev = dev_get_by_name(net, ifr->ifr_slave);
3521
3522         pr_debug("slave_dev=%p:\n", slave_dev);
3523
3524         if (!slave_dev)
3525                 res = -ENODEV;
3526         else {
3527                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3528                 switch (cmd) {
3529                 case BOND_ENSLAVE_OLD:
3530                 case SIOCBONDENSLAVE:
3531                         res = bond_enslave(bond_dev, slave_dev);
3532                         break;
3533                 case BOND_RELEASE_OLD:
3534                 case SIOCBONDRELEASE:
3535                         res = bond_release(bond_dev, slave_dev);
3536                         break;
3537                 case BOND_SETHWADDR_OLD:
3538                 case SIOCBONDSETHWADDR:
3539                         bond_set_dev_addr(bond_dev, slave_dev);
3540                         res = 0;
3541                         break;
3542                 case BOND_CHANGE_ACTIVE_OLD:
3543                 case SIOCBONDCHANGEACTIVE:
3544                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3545                         break;
3546                 default:
3547                         res = -EOPNOTSUPP;
3548                 }
3549
3550                 dev_put(slave_dev);
3551         }
3552
3553         return res;
3554 }
3555
3556 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3557 {
3558         struct bonding *bond = netdev_priv(bond_dev);
3559
3560         if (change & IFF_PROMISC)
3561                 bond_set_promiscuity(bond,
3562                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3563
3564         if (change & IFF_ALLMULTI)
3565                 bond_set_allmulti(bond,
3566                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3567 }
3568
3569 static void bond_set_rx_mode(struct net_device *bond_dev)
3570 {
3571         struct bonding *bond = netdev_priv(bond_dev);
3572         struct slave *slave;
3573
3574         read_lock(&bond->lock);
3575
3576         if (USES_PRIMARY(bond->params.mode)) {
3577                 read_lock(&bond->curr_slave_lock);
3578                 slave = bond->curr_active_slave;
3579                 if (slave) {
3580                         dev_uc_sync(slave->dev, bond_dev);
3581                         dev_mc_sync(slave->dev, bond_dev);
3582                 }
3583                 read_unlock(&bond->curr_slave_lock);
3584         } else {
3585                 bond_for_each_slave(bond, slave) {
3586                         dev_uc_sync_multiple(slave->dev, bond_dev);
3587                         dev_mc_sync_multiple(slave->dev, bond_dev);
3588                 }
3589         }
3590
3591         read_unlock(&bond->lock);
3592 }
3593
3594 static int bond_neigh_init(struct neighbour *n)
3595 {
3596         struct bonding *bond = netdev_priv(n->dev);
3597         const struct net_device_ops *slave_ops;
3598         struct neigh_parms parms;
3599         struct slave *slave;
3600         int ret;
3601
3602         slave = bond_first_slave(bond);
3603         if (!slave)
3604                 return 0;
3605         slave_ops = slave->dev->netdev_ops;
3606         if (!slave_ops->ndo_neigh_setup)
3607                 return 0;
3608
3609         parms.neigh_setup = NULL;
3610         parms.neigh_cleanup = NULL;
3611         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3612         if (ret)
3613                 return ret;
3614
3615         /*
3616          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3617          * after the last slave has been detached.  Assumes that all slaves
3618          * utilize the same neigh_cleanup (true at this writing as only user
3619          * is ipoib).
3620          */
3621         n->parms->neigh_cleanup = parms.neigh_cleanup;
3622
3623         if (!parms.neigh_setup)
3624                 return 0;
3625
3626         return parms.neigh_setup(n);
3627 }
3628
3629 /*
3630  * The bonding ndo_neigh_setup is called at init time beofre any
3631  * slave exists. So we must declare proxy setup function which will
3632  * be used at run time to resolve the actual slave neigh param setup.
3633  *
3634  * It's also called by master devices (such as vlans) to setup their
3635  * underlying devices. In that case - do nothing, we're already set up from
3636  * our init.
3637  */
3638 static int bond_neigh_setup(struct net_device *dev,
3639                             struct neigh_parms *parms)
3640 {
3641         /* modify only our neigh_parms */
3642         if (parms->dev == dev)
3643                 parms->neigh_setup = bond_neigh_init;
3644
3645         return 0;
3646 }
3647
3648 /*
3649  * Change the MTU of all of a master's slaves to match the master
3650  */
3651 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3652 {
3653         struct bonding *bond = netdev_priv(bond_dev);
3654         struct slave *slave;
3655         int res = 0;
3656
3657         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3658                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3659
3660         /* Can't hold bond->lock with bh disabled here since
3661          * some base drivers panic. On the other hand we can't
3662          * hold bond->lock without bh disabled because we'll
3663          * deadlock. The only solution is to rely on the fact
3664          * that we're under rtnl_lock here, and the slaves
3665          * list won't change. This doesn't solve the problem
3666          * of setting the slave's MTU while it is
3667          * transmitting, but the assumption is that the base
3668          * driver can handle that.
3669          *
3670          * TODO: figure out a way to safely iterate the slaves
3671          * list, but without holding a lock around the actual
3672          * call to the base driver.
3673          */
3674
3675         bond_for_each_slave(bond, slave) {
3676                 pr_debug("s %p s->p %p c_m %p\n",
3677                          slave,
3678                          bond_prev_slave(bond, slave),
3679                          slave->dev->netdev_ops->ndo_change_mtu);
3680
3681                 res = dev_set_mtu(slave->dev, new_mtu);
3682
3683                 if (res) {
3684                         /* If we failed to set the slave's mtu to the new value
3685                          * we must abort the operation even in ACTIVE_BACKUP
3686                          * mode, because if we allow the backup slaves to have
3687                          * different mtu values than the active slave we'll
3688                          * need to change their mtu when doing a failover. That
3689                          * means changing their mtu from timer context, which
3690                          * is probably not a good idea.
3691                          */
3692                         pr_debug("err %d %s\n", res, slave->dev->name);
3693                         goto unwind;
3694                 }
3695         }
3696
3697         bond_dev->mtu = new_mtu;
3698
3699         return 0;
3700
3701 unwind:
3702         /* unwind from head to the slave that failed */
3703         bond_for_each_slave_continue_reverse(bond, slave) {
3704                 int tmp_res;
3705
3706                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3707                 if (tmp_res) {
3708                         pr_debug("unwind err %d dev %s\n",
3709                                  tmp_res, slave->dev->name);
3710                 }
3711         }
3712
3713         return res;
3714 }
3715
3716 /*
3717  * Change HW address
3718  *
3719  * Note that many devices must be down to change the HW address, and
3720  * downing the master releases all slaves.  We can make bonds full of
3721  * bonding devices to test this, however.
3722  */
3723 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3724 {
3725         struct bonding *bond = netdev_priv(bond_dev);
3726         struct sockaddr *sa = addr, tmp_sa;
3727         struct slave *slave;
3728         int res = 0;
3729
3730         if (bond->params.mode == BOND_MODE_ALB)
3731                 return bond_alb_set_mac_address(bond_dev, addr);
3732
3733
3734         pr_debug("bond=%p, name=%s\n",
3735                  bond, bond_dev ? bond_dev->name : "None");
3736
3737         /* If fail_over_mac is enabled, do nothing and return success.
3738          * Returning an error causes ifenslave to fail.
3739          */
3740         if (bond->params.fail_over_mac)
3741                 return 0;
3742
3743         if (!is_valid_ether_addr(sa->sa_data))
3744                 return -EADDRNOTAVAIL;
3745
3746         /* Can't hold bond->lock with bh disabled here since
3747          * some base drivers panic. On the other hand we can't
3748          * hold bond->lock without bh disabled because we'll
3749          * deadlock. The only solution is to rely on the fact
3750          * that we're under rtnl_lock here, and the slaves
3751          * list won't change. This doesn't solve the problem
3752          * of setting the slave's hw address while it is
3753          * transmitting, but the assumption is that the base
3754          * driver can handle that.
3755          *
3756          * TODO: figure out a way to safely iterate the slaves
3757          * list, but without holding a lock around the actual
3758          * call to the base driver.
3759          */
3760
3761         bond_for_each_slave(bond, slave) {
3762                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3763                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3764
3765                 if (slave_ops->ndo_set_mac_address == NULL) {
3766                         res = -EOPNOTSUPP;
3767                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3768                         goto unwind;
3769                 }
3770
3771                 res = dev_set_mac_address(slave->dev, addr);
3772                 if (res) {
3773                         /* TODO: consider downing the slave
3774                          * and retry ?
3775                          * User should expect communications
3776                          * breakage anyway until ARP finish
3777                          * updating, so...
3778                          */
3779                         pr_debug("err %d %s\n", res, slave->dev->name);
3780                         goto unwind;
3781                 }
3782         }
3783
3784         /* success */
3785         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3786         return 0;
3787
3788 unwind:
3789         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3790         tmp_sa.sa_family = bond_dev->type;
3791
3792         /* unwind from head to the slave that failed */
3793         bond_for_each_slave_continue_reverse(bond, slave) {
3794                 int tmp_res;
3795
3796                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3797                 if (tmp_res) {
3798                         pr_debug("unwind err %d dev %s\n",
3799                                  tmp_res, slave->dev->name);
3800                 }
3801         }
3802
3803         return res;
3804 }
3805
3806 /**
3807  * bond_xmit_slave_id - transmit skb through slave with slave_id
3808  * @bond: bonding device that is transmitting
3809  * @skb: buffer to transmit
3810  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3811  *
3812  * This function tries to transmit through slave with slave_id but in case
3813  * it fails, it tries to find the first available slave for transmission.
3814  * The skb is consumed in all cases, thus the function is void.
3815  */
3816 void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3817 {
3818         struct slave *slave;
3819         int i = slave_id;
3820
3821         /* Here we start from the slave with slave_id */
3822         bond_for_each_slave_rcu(bond, slave) {
3823                 if (--i < 0) {
3824                         if (slave_can_tx(slave)) {
3825                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3826                                 return;
3827                         }
3828                 }
3829         }
3830
3831         /* Here we start from the first slave up to slave_id */
3832         i = slave_id;
3833         bond_for_each_slave_rcu(bond, slave) {
3834                 if (--i < 0)
3835                         break;
3836                 if (slave_can_tx(slave)) {
3837                         bond_dev_queue_xmit(bond, skb, slave->dev);
3838                         return;
3839                 }
3840         }
3841         /* no slave that can tx has been found */
3842         kfree_skb(skb);
3843 }
3844
3845 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3846 {
3847         struct bonding *bond = netdev_priv(bond_dev);
3848         struct iphdr *iph = ip_hdr(skb);
3849         struct slave *slave;
3850
3851         /*
3852          * Start with the curr_active_slave that joined the bond as the
3853          * default for sending IGMP traffic.  For failover purposes one
3854          * needs to maintain some consistency for the interface that will
3855          * send the join/membership reports.  The curr_active_slave found
3856          * will send all of this type of traffic.
3857          */
3858         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3859                 slave = rcu_dereference(bond->curr_active_slave);
3860                 if (slave && slave_can_tx(slave))
3861                         bond_dev_queue_xmit(bond, skb, slave->dev);
3862                 else
3863                         bond_xmit_slave_id(bond, skb, 0);
3864         } else {
3865                 bond_xmit_slave_id(bond, skb,
3866                                    bond->rr_tx_counter++ % bond->slave_cnt);
3867         }
3868
3869         return NETDEV_TX_OK;
3870 }
3871
3872 /*
3873  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3874  * the bond has a usable interface.
3875  */
3876 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3877 {
3878         struct bonding *bond = netdev_priv(bond_dev);
3879         struct slave *slave;
3880
3881         slave = rcu_dereference(bond->curr_active_slave);
3882         if (slave)
3883                 bond_dev_queue_xmit(bond, skb, slave->dev);
3884         else
3885                 kfree_skb(skb);
3886
3887         return NETDEV_TX_OK;
3888 }
3889
3890 /*
3891  * In bond_xmit_xor() , we determine the output device by using a pre-
3892  * determined xmit_hash_policy(), If the selected device is not enabled,
3893  * find the next active slave.
3894  */
3895 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3896 {
3897         struct bonding *bond = netdev_priv(bond_dev);
3898
3899         bond_xmit_slave_id(bond, skb,
3900                            bond->xmit_hash_policy(skb, bond->slave_cnt));
3901
3902         return NETDEV_TX_OK;
3903 }
3904
3905 /* in broadcast mode, we send everything to all usable interfaces. */
3906 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3907 {
3908         struct bonding *bond = netdev_priv(bond_dev);
3909         struct slave *slave = NULL;
3910
3911         bond_for_each_slave_rcu(bond, slave) {
3912                 if (bond_is_last_slave(bond, slave))
3913                         break;
3914                 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
3915                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3916
3917                         if (!skb2) {
3918                                 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
3919                                        bond_dev->name);
3920                                 continue;
3921                         }
3922                         /* bond_dev_queue_xmit always returns 0 */
3923                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3924                 }
3925         }
3926         if (slave && IS_UP(slave->dev) && slave->link == BOND_LINK_UP)
3927                 bond_dev_queue_xmit(bond, skb, slave->dev);
3928         else
3929                 kfree_skb(skb);
3930
3931         return NETDEV_TX_OK;
3932 }
3933
3934 /*------------------------- Device initialization ---------------------------*/
3935
3936 static void bond_set_xmit_hash_policy(struct bonding *bond)
3937 {
3938         switch (bond->params.xmit_policy) {
3939         case BOND_XMIT_POLICY_LAYER23:
3940                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
3941                 break;
3942         case BOND_XMIT_POLICY_LAYER34:
3943                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
3944                 break;
3945         case BOND_XMIT_POLICY_LAYER2:
3946         default:
3947                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
3948                 break;
3949         }
3950 }
3951
3952 /*
3953  * Lookup the slave that corresponds to a qid
3954  */
3955 static inline int bond_slave_override(struct bonding *bond,
3956                                       struct sk_buff *skb)
3957 {
3958         struct slave *slave = NULL;
3959         struct slave *check_slave;
3960         int res = 1;
3961
3962         if (!skb->queue_mapping)
3963                 return 1;
3964
3965         /* Find out if any slaves have the same mapping as this skb. */
3966         bond_for_each_slave_rcu(bond, check_slave) {
3967                 if (check_slave->queue_id == skb->queue_mapping) {
3968                         slave = check_slave;
3969                         break;
3970                 }
3971         }
3972
3973         /* If the slave isn't UP, use default transmit policy. */
3974         if (slave && slave->queue_id && IS_UP(slave->dev) &&
3975             (slave->link == BOND_LINK_UP)) {
3976                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3977         }
3978
3979         return res;
3980 }
3981
3982
3983 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
3984 {
3985         /*
3986          * This helper function exists to help dev_pick_tx get the correct
3987          * destination queue.  Using a helper function skips a call to
3988          * skb_tx_hash and will put the skbs in the queue we expect on their
3989          * way down to the bonding driver.
3990          */
3991         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3992
3993         /*
3994          * Save the original txq to restore before passing to the driver
3995          */
3996         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3997
3998         if (unlikely(txq >= dev->real_num_tx_queues)) {
3999                 do {
4000                         txq -= dev->real_num_tx_queues;
4001                 } while (txq >= dev->real_num_tx_queues);
4002         }
4003         return txq;
4004 }
4005
4006 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4007 {
4008         struct bonding *bond = netdev_priv(dev);
4009
4010         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4011                 if (!bond_slave_override(bond, skb))
4012                         return NETDEV_TX_OK;
4013         }
4014
4015         switch (bond->params.mode) {
4016         case BOND_MODE_ROUNDROBIN:
4017                 return bond_xmit_roundrobin(skb, dev);
4018         case BOND_MODE_ACTIVEBACKUP:
4019                 return bond_xmit_activebackup(skb, dev);
4020         case BOND_MODE_XOR:
4021                 return bond_xmit_xor(skb, dev);
4022         case BOND_MODE_BROADCAST:
4023                 return bond_xmit_broadcast(skb, dev);
4024         case BOND_MODE_8023AD:
4025                 return bond_3ad_xmit_xor(skb, dev);
4026         case BOND_MODE_ALB:
4027         case BOND_MODE_TLB:
4028                 return bond_alb_xmit(skb, dev);
4029         default:
4030                 /* Should never happen, mode already checked */
4031                 pr_err("%s: Error: Unknown bonding mode %d\n",
4032                        dev->name, bond->params.mode);
4033                 WARN_ON_ONCE(1);
4034                 kfree_skb(skb);
4035                 return NETDEV_TX_OK;
4036         }
4037 }
4038
4039 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4040 {
4041         struct bonding *bond = netdev_priv(dev);
4042         netdev_tx_t ret = NETDEV_TX_OK;
4043
4044         /*
4045          * If we risk deadlock from transmitting this in the
4046          * netpoll path, tell netpoll to queue the frame for later tx
4047          */
4048         if (is_netpoll_tx_blocked(dev))
4049                 return NETDEV_TX_BUSY;
4050
4051         rcu_read_lock();
4052         if (!list_empty(&bond->slave_list))
4053                 ret = __bond_start_xmit(skb, dev);
4054         else
4055                 kfree_skb(skb);
4056         rcu_read_unlock();
4057
4058         return ret;
4059 }
4060
4061 /*
4062  * set bond mode specific net device operations
4063  */
4064 void bond_set_mode_ops(struct bonding *bond, int mode)
4065 {
4066         struct net_device *bond_dev = bond->dev;
4067
4068         switch (mode) {
4069         case BOND_MODE_ROUNDROBIN:
4070                 break;
4071         case BOND_MODE_ACTIVEBACKUP:
4072                 break;
4073         case BOND_MODE_XOR:
4074                 bond_set_xmit_hash_policy(bond);
4075                 break;
4076         case BOND_MODE_BROADCAST:
4077                 break;
4078         case BOND_MODE_8023AD:
4079                 bond_set_xmit_hash_policy(bond);
4080                 break;
4081         case BOND_MODE_ALB:
4082                 /* FALLTHRU */
4083         case BOND_MODE_TLB:
4084                 break;
4085         default:
4086                 /* Should never happen, mode already checked */
4087                 pr_err("%s: Error: Unknown bonding mode %d\n",
4088                        bond_dev->name, mode);
4089                 break;
4090         }
4091 }
4092
4093 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4094                                      struct ethtool_cmd *ecmd)
4095 {
4096         struct bonding *bond = netdev_priv(bond_dev);
4097         unsigned long speed = 0;
4098         struct slave *slave;
4099
4100         ecmd->duplex = DUPLEX_UNKNOWN;
4101         ecmd->port = PORT_OTHER;
4102
4103         /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
4104          * do not need to check mode.  Though link speed might not represent
4105          * the true receive or transmit bandwidth (not all modes are symmetric)
4106          * this is an accurate maximum.
4107          */
4108         read_lock(&bond->lock);
4109         bond_for_each_slave(bond, slave) {
4110                 if (SLAVE_IS_OK(slave)) {
4111                         if (slave->speed != SPEED_UNKNOWN)
4112                                 speed += slave->speed;
4113                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
4114                             slave->duplex != DUPLEX_UNKNOWN)
4115                                 ecmd->duplex = slave->duplex;
4116                 }
4117         }
4118         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4119         read_unlock(&bond->lock);
4120
4121         return 0;
4122 }
4123
4124 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4125                                      struct ethtool_drvinfo *drvinfo)
4126 {
4127         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4128         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4129         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4130                  BOND_ABI_VERSION);
4131 }
4132
4133 static const struct ethtool_ops bond_ethtool_ops = {
4134         .get_drvinfo            = bond_ethtool_get_drvinfo,
4135         .get_settings           = bond_ethtool_get_settings,
4136         .get_link               = ethtool_op_get_link,
4137 };
4138
4139 static const struct net_device_ops bond_netdev_ops = {
4140         .ndo_init               = bond_init,
4141         .ndo_uninit             = bond_uninit,
4142         .ndo_open               = bond_open,
4143         .ndo_stop               = bond_close,
4144         .ndo_start_xmit         = bond_start_xmit,
4145         .ndo_select_queue       = bond_select_queue,
4146         .ndo_get_stats64        = bond_get_stats,
4147         .ndo_do_ioctl           = bond_do_ioctl,
4148         .ndo_change_rx_flags    = bond_change_rx_flags,
4149         .ndo_set_rx_mode        = bond_set_rx_mode,
4150         .ndo_change_mtu         = bond_change_mtu,
4151         .ndo_set_mac_address    = bond_set_mac_address,
4152         .ndo_neigh_setup        = bond_neigh_setup,
4153         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4154         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4155 #ifdef CONFIG_NET_POLL_CONTROLLER
4156         .ndo_netpoll_setup      = bond_netpoll_setup,
4157         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4158         .ndo_poll_controller    = bond_poll_controller,
4159 #endif
4160         .ndo_add_slave          = bond_enslave,
4161         .ndo_del_slave          = bond_release,
4162         .ndo_fix_features       = bond_fix_features,
4163 };
4164
4165 static const struct device_type bond_type = {
4166         .name = "bond",
4167 };
4168
4169 static void bond_destructor(struct net_device *bond_dev)
4170 {
4171         struct bonding *bond = netdev_priv(bond_dev);
4172         if (bond->wq)
4173                 destroy_workqueue(bond->wq);
4174         free_netdev(bond_dev);
4175 }
4176
4177 static void bond_setup(struct net_device *bond_dev)
4178 {
4179         struct bonding *bond = netdev_priv(bond_dev);
4180
4181         /* initialize rwlocks */
4182         rwlock_init(&bond->lock);
4183         rwlock_init(&bond->curr_slave_lock);
4184         INIT_LIST_HEAD(&bond->slave_list);
4185         bond->params = bonding_defaults;
4186
4187         /* Initialize pointers */
4188         bond->dev = bond_dev;
4189         INIT_LIST_HEAD(&bond->vlan_list);
4190
4191         /* Initialize the device entry points */
4192         ether_setup(bond_dev);
4193         bond_dev->netdev_ops = &bond_netdev_ops;
4194         bond_dev->ethtool_ops = &bond_ethtool_ops;
4195         bond_set_mode_ops(bond, bond->params.mode);
4196
4197         bond_dev->destructor = bond_destructor;
4198
4199         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4200
4201         /* Initialize the device options */
4202         bond_dev->tx_queue_len = 0;
4203         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4204         bond_dev->priv_flags |= IFF_BONDING;
4205         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4206
4207         /* At first, we block adding VLANs. That's the only way to
4208          * prevent problems that occur when adding VLANs over an
4209          * empty bond. The block will be removed once non-challenged
4210          * slaves are enslaved.
4211          */
4212         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4213
4214         /* don't acquire bond device's netif_tx_lock when
4215          * transmitting */
4216         bond_dev->features |= NETIF_F_LLTX;
4217
4218         /* By default, we declare the bond to be fully
4219          * VLAN hardware accelerated capable. Special
4220          * care is taken in the various xmit functions
4221          * when there are slaves that are not hw accel
4222          * capable
4223          */
4224
4225         bond_dev->hw_features = BOND_VLAN_FEATURES |
4226                                 NETIF_F_HW_VLAN_CTAG_TX |
4227                                 NETIF_F_HW_VLAN_CTAG_RX |
4228                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4229
4230         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4231         bond_dev->features |= bond_dev->hw_features;
4232 }
4233
4234 /*
4235 * Destroy a bonding device.
4236 * Must be under rtnl_lock when this function is called.
4237 */
4238 static void bond_uninit(struct net_device *bond_dev)
4239 {
4240         struct bonding *bond = netdev_priv(bond_dev);
4241         struct slave *slave, *tmp_slave;
4242         struct vlan_entry *vlan, *tmp;
4243
4244         bond_netpoll_cleanup(bond_dev);
4245
4246         /* Release the bonded slaves */
4247         list_for_each_entry_safe(slave, tmp_slave, &bond->slave_list, list)
4248                 __bond_release_one(bond_dev, slave->dev, true);
4249         pr_info("%s: released all slaves\n", bond_dev->name);
4250
4251         list_del(&bond->bond_list);
4252
4253         bond_debug_unregister(bond);
4254
4255         list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4256                 list_del(&vlan->vlan_list);
4257                 kfree(vlan);
4258         }
4259 }
4260
4261 /*------------------------- Module initialization ---------------------------*/
4262
4263 /*
4264  * Convert string input module parms.  Accept either the
4265  * number of the mode or its string name.  A bit complicated because
4266  * some mode names are substrings of other names, and calls from sysfs
4267  * may have whitespace in the name (trailing newlines, for example).
4268  */
4269 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4270 {
4271         int modeint = -1, i, rv;
4272         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4273
4274         for (p = (char *)buf; *p; p++)
4275                 if (!(isdigit(*p) || isspace(*p)))
4276                         break;
4277
4278         if (*p)
4279                 rv = sscanf(buf, "%20s", modestr);
4280         else
4281                 rv = sscanf(buf, "%d", &modeint);
4282
4283         if (!rv)
4284                 return -1;
4285
4286         for (i = 0; tbl[i].modename; i++) {
4287                 if (modeint == tbl[i].mode)
4288                         return tbl[i].mode;
4289                 if (strcmp(modestr, tbl[i].modename) == 0)
4290                         return tbl[i].mode;
4291         }
4292
4293         return -1;
4294 }
4295
4296 static int bond_check_params(struct bond_params *params)
4297 {
4298         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4299         int arp_all_targets_value;
4300
4301         /*
4302          * Convert string parameters.
4303          */
4304         if (mode) {
4305                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4306                 if (bond_mode == -1) {
4307                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4308                                mode == NULL ? "NULL" : mode);
4309                         return -EINVAL;
4310                 }
4311         }
4312
4313         if (xmit_hash_policy) {
4314                 if ((bond_mode != BOND_MODE_XOR) &&
4315                     (bond_mode != BOND_MODE_8023AD)) {
4316                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4317                                bond_mode_name(bond_mode));
4318                 } else {
4319                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4320                                                         xmit_hashtype_tbl);
4321                         if (xmit_hashtype == -1) {
4322                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4323                                        xmit_hash_policy == NULL ? "NULL" :
4324                                        xmit_hash_policy);
4325                                 return -EINVAL;
4326                         }
4327                 }
4328         }
4329
4330         if (lacp_rate) {
4331                 if (bond_mode != BOND_MODE_8023AD) {
4332                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4333                                 bond_mode_name(bond_mode));
4334                 } else {
4335                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4336                         if (lacp_fast == -1) {
4337                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4338                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4339                                 return -EINVAL;
4340                         }
4341                 }
4342         }
4343
4344         if (ad_select) {
4345                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4346                 if (params->ad_select == -1) {
4347                         pr_err("Error: Invalid ad_select \"%s\"\n",
4348                                ad_select == NULL ? "NULL" : ad_select);
4349                         return -EINVAL;
4350                 }
4351
4352                 if (bond_mode != BOND_MODE_8023AD) {
4353                         pr_warning("ad_select param only affects 802.3ad mode\n");
4354                 }
4355         } else {
4356                 params->ad_select = BOND_AD_STABLE;
4357         }
4358
4359         if (max_bonds < 0) {
4360                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4361                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4362                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4363         }
4364
4365         if (miimon < 0) {
4366                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4367                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4368                 miimon = BOND_LINK_MON_INTERV;
4369         }
4370
4371         if (updelay < 0) {
4372                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4373                            updelay, INT_MAX);
4374                 updelay = 0;
4375         }
4376
4377         if (downdelay < 0) {
4378                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4379                            downdelay, INT_MAX);
4380                 downdelay = 0;
4381         }
4382
4383         if ((use_carrier != 0) && (use_carrier != 1)) {
4384                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4385                            use_carrier);
4386                 use_carrier = 1;
4387         }
4388
4389         if (num_peer_notif < 0 || num_peer_notif > 255) {
4390                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4391                            num_peer_notif);
4392                 num_peer_notif = 1;
4393         }
4394
4395         /* reset values for 802.3ad */
4396         if (bond_mode == BOND_MODE_8023AD) {
4397                 if (!miimon) {
4398                         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");
4399                         pr_warning("Forcing miimon to 100msec\n");
4400                         miimon = 100;
4401                 }
4402         }
4403
4404         if (tx_queues < 1 || tx_queues > 255) {
4405                 pr_warning("Warning: tx_queues (%d) should be between "
4406                            "1 and 255, resetting to %d\n",
4407                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4408                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4409         }
4410
4411         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4412                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4413                            "not of valid value (0/1), so it was set to "
4414                            "0\n", all_slaves_active);
4415                 all_slaves_active = 0;
4416         }
4417
4418         if (resend_igmp < 0 || resend_igmp > 255) {
4419                 pr_warning("Warning: resend_igmp (%d) should be between "
4420                            "0 and 255, resetting to %d\n",
4421                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4422                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4423         }
4424
4425         /* reset values for TLB/ALB */
4426         if ((bond_mode == BOND_MODE_TLB) ||
4427             (bond_mode == BOND_MODE_ALB)) {
4428                 if (!miimon) {
4429                         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");
4430                         pr_warning("Forcing miimon to 100msec\n");
4431                         miimon = 100;
4432                 }
4433         }
4434
4435         if (bond_mode == BOND_MODE_ALB) {
4436                 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",
4437                           updelay);
4438         }
4439
4440         if (!miimon) {
4441                 if (updelay || downdelay) {
4442                         /* just warn the user the up/down delay will have
4443                          * no effect since miimon is zero...
4444                          */
4445                         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",
4446                                    updelay, downdelay);
4447                 }
4448         } else {
4449                 /* don't allow arp monitoring */
4450                 if (arp_interval) {
4451                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4452                                    miimon, arp_interval);
4453                         arp_interval = 0;
4454                 }
4455
4456                 if ((updelay % miimon) != 0) {
4457                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4458                                    updelay, miimon,
4459                                    (updelay / miimon) * miimon);
4460                 }
4461
4462                 updelay /= miimon;
4463
4464                 if ((downdelay % miimon) != 0) {
4465                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4466                                    downdelay, miimon,
4467                                    (downdelay / miimon) * miimon);
4468                 }
4469
4470                 downdelay /= miimon;
4471         }
4472
4473         if (arp_interval < 0) {
4474                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4475                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4476                 arp_interval = BOND_LINK_ARP_INTERV;
4477         }
4478
4479         for (arp_ip_count = 0, i = 0;
4480              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4481                 /* not complete check, but should be good enough to
4482                    catch mistakes */
4483                 __be32 ip = in_aton(arp_ip_target[i]);
4484                 if (!isdigit(arp_ip_target[i][0]) || ip == 0 ||
4485                     ip == htonl(INADDR_BROADCAST)) {
4486                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4487                                    arp_ip_target[i]);
4488                         arp_interval = 0;
4489                 } else {
4490                         if (bond_get_targets_ip(arp_target, ip) == -1)
4491                                 arp_target[arp_ip_count++] = ip;
4492                         else
4493                                 pr_warning("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4494                                            &ip);
4495                 }
4496         }
4497
4498         if (arp_interval && !arp_ip_count) {
4499                 /* don't allow arping if no arp_ip_target given... */
4500                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4501                            arp_interval);
4502                 arp_interval = 0;
4503         }
4504
4505         if (arp_validate) {
4506                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4507                         pr_err("arp_validate only supported in active-backup mode\n");
4508                         return -EINVAL;
4509                 }
4510                 if (!arp_interval) {
4511                         pr_err("arp_validate requires arp_interval\n");
4512                         return -EINVAL;
4513                 }
4514
4515                 arp_validate_value = bond_parse_parm(arp_validate,
4516                                                      arp_validate_tbl);
4517                 if (arp_validate_value == -1) {
4518                         pr_err("Error: invalid arp_validate \"%s\"\n",
4519                                arp_validate == NULL ? "NULL" : arp_validate);
4520                         return -EINVAL;
4521                 }
4522         } else
4523                 arp_validate_value = 0;
4524
4525         arp_all_targets_value = 0;
4526         if (arp_all_targets) {
4527                 arp_all_targets_value = bond_parse_parm(arp_all_targets,
4528                                                         arp_all_targets_tbl);
4529
4530                 if (arp_all_targets_value == -1) {
4531                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4532                                arp_all_targets);
4533                         arp_all_targets_value = 0;
4534                 }
4535         }
4536
4537         if (miimon) {
4538                 pr_info("MII link monitoring set to %d ms\n", miimon);
4539         } else if (arp_interval) {
4540                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4541                         arp_interval,
4542                         arp_validate_tbl[arp_validate_value].modename,
4543                         arp_ip_count);
4544
4545                 for (i = 0; i < arp_ip_count; i++)
4546                         pr_info(" %s", arp_ip_target[i]);
4547
4548                 pr_info("\n");
4549
4550         } else if (max_bonds) {
4551                 /* miimon and arp_interval not set, we need one so things
4552                  * work as expected, see bonding.txt for details
4553                  */
4554                 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");
4555         }
4556
4557         if (primary && !USES_PRIMARY(bond_mode)) {
4558                 /* currently, using a primary only makes sense
4559                  * in active backup, TLB or ALB modes
4560                  */
4561                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4562                            primary, bond_mode_name(bond_mode));
4563                 primary = NULL;
4564         }
4565
4566         if (primary && primary_reselect) {
4567                 primary_reselect_value = bond_parse_parm(primary_reselect,
4568                                                          pri_reselect_tbl);
4569                 if (primary_reselect_value == -1) {
4570                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4571                                primary_reselect ==
4572                                         NULL ? "NULL" : primary_reselect);
4573                         return -EINVAL;
4574                 }
4575         } else {
4576                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4577         }
4578
4579         if (fail_over_mac) {
4580                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4581                                                       fail_over_mac_tbl);
4582                 if (fail_over_mac_value == -1) {
4583                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4584                                arp_validate == NULL ? "NULL" : arp_validate);
4585                         return -EINVAL;
4586                 }
4587
4588                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4589                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4590         } else {
4591                 fail_over_mac_value = BOND_FOM_NONE;
4592         }
4593
4594         /* fill params struct with the proper values */
4595         params->mode = bond_mode;
4596         params->xmit_policy = xmit_hashtype;
4597         params->miimon = miimon;
4598         params->num_peer_notif = num_peer_notif;
4599         params->arp_interval = arp_interval;
4600         params->arp_validate = arp_validate_value;
4601         params->arp_all_targets = arp_all_targets_value;
4602         params->updelay = updelay;
4603         params->downdelay = downdelay;
4604         params->use_carrier = use_carrier;
4605         params->lacp_fast = lacp_fast;
4606         params->primary[0] = 0;
4607         params->primary_reselect = primary_reselect_value;
4608         params->fail_over_mac = fail_over_mac_value;
4609         params->tx_queues = tx_queues;
4610         params->all_slaves_active = all_slaves_active;
4611         params->resend_igmp = resend_igmp;
4612         params->min_links = min_links;
4613
4614         if (primary) {
4615                 strncpy(params->primary, primary, IFNAMSIZ);
4616                 params->primary[IFNAMSIZ - 1] = 0;
4617         }
4618
4619         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4620
4621         return 0;
4622 }
4623
4624 static struct lock_class_key bonding_netdev_xmit_lock_key;
4625 static struct lock_class_key bonding_netdev_addr_lock_key;
4626 static struct lock_class_key bonding_tx_busylock_key;
4627
4628 static void bond_set_lockdep_class_one(struct net_device *dev,
4629                                        struct netdev_queue *txq,
4630                                        void *_unused)
4631 {
4632         lockdep_set_class(&txq->_xmit_lock,
4633                           &bonding_netdev_xmit_lock_key);
4634 }
4635
4636 static void bond_set_lockdep_class(struct net_device *dev)
4637 {
4638         lockdep_set_class(&dev->addr_list_lock,
4639                           &bonding_netdev_addr_lock_key);
4640         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4641         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4642 }
4643
4644 /*
4645  * Called from registration process
4646  */
4647 static int bond_init(struct net_device *bond_dev)
4648 {
4649         struct bonding *bond = netdev_priv(bond_dev);
4650         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4651         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4652
4653         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4654
4655         /*
4656          * Initialize locks that may be required during
4657          * en/deslave operations.  All of the bond_open work
4658          * (of which this is part) should really be moved to
4659          * a phase prior to dev_open
4660          */
4661         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4662         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4663
4664         bond->wq = create_singlethread_workqueue(bond_dev->name);
4665         if (!bond->wq)
4666                 return -ENOMEM;
4667
4668         bond_set_lockdep_class(bond_dev);
4669
4670         list_add_tail(&bond->bond_list, &bn->dev_list);
4671
4672         bond_prepare_sysfs_group(bond);
4673
4674         bond_debug_register(bond);
4675
4676         /* Ensure valid dev_addr */
4677         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4678             bond_dev->addr_assign_type == NET_ADDR_PERM)
4679                 eth_hw_addr_random(bond_dev);
4680
4681         return 0;
4682 }
4683
4684 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4685 {
4686         if (tb[IFLA_ADDRESS]) {
4687                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4688                         return -EINVAL;
4689                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4690                         return -EADDRNOTAVAIL;
4691         }
4692         return 0;
4693 }
4694
4695 static unsigned int bond_get_num_tx_queues(void)
4696 {
4697         return tx_queues;
4698 }
4699
4700 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4701         .kind                   = "bond",
4702         .priv_size              = sizeof(struct bonding),
4703         .setup                  = bond_setup,
4704         .validate               = bond_validate,
4705         .get_num_tx_queues      = bond_get_num_tx_queues,
4706         .get_num_rx_queues      = bond_get_num_tx_queues, /* Use the same number
4707                                                              as for TX queues */
4708 };
4709
4710 /* Create a new bond based on the specified name and bonding parameters.
4711  * If name is NULL, obtain a suitable "bond%d" name for us.
4712  * Caller must NOT hold rtnl_lock; we need to release it here before we
4713  * set up our sysfs entries.
4714  */
4715 int bond_create(struct net *net, const char *name)
4716 {
4717         struct net_device *bond_dev;
4718         int res;
4719
4720         rtnl_lock();
4721
4722         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4723                                    name ? name : "bond%d",
4724                                    bond_setup, tx_queues);
4725         if (!bond_dev) {
4726                 pr_err("%s: eek! can't alloc netdev!\n", name);
4727                 rtnl_unlock();
4728                 return -ENOMEM;
4729         }
4730
4731         dev_net_set(bond_dev, net);
4732         bond_dev->rtnl_link_ops = &bond_link_ops;
4733
4734         res = register_netdevice(bond_dev);
4735
4736         netif_carrier_off(bond_dev);
4737
4738         rtnl_unlock();
4739         if (res < 0)
4740                 bond_destructor(bond_dev);
4741         return res;
4742 }
4743
4744 static int __net_init bond_net_init(struct net *net)
4745 {
4746         struct bond_net *bn = net_generic(net, bond_net_id);
4747
4748         bn->net = net;
4749         INIT_LIST_HEAD(&bn->dev_list);
4750
4751         bond_create_proc_dir(bn);
4752         bond_create_sysfs(bn);
4753
4754         return 0;
4755 }
4756
4757 static void __net_exit bond_net_exit(struct net *net)
4758 {
4759         struct bond_net *bn = net_generic(net, bond_net_id);
4760         struct bonding *bond, *tmp_bond;
4761         LIST_HEAD(list);
4762
4763         bond_destroy_sysfs(bn);
4764         bond_destroy_proc_dir(bn);
4765
4766         /* Kill off any bonds created after unregistering bond rtnl ops */
4767         rtnl_lock();
4768         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4769                 unregister_netdevice_queue(bond->dev, &list);
4770         unregister_netdevice_many(&list);
4771         rtnl_unlock();
4772 }
4773
4774 static struct pernet_operations bond_net_ops = {
4775         .init = bond_net_init,
4776         .exit = bond_net_exit,
4777         .id   = &bond_net_id,
4778         .size = sizeof(struct bond_net),
4779 };
4780
4781 static int __init bonding_init(void)
4782 {
4783         int i;
4784         int res;
4785
4786         pr_info("%s", bond_version);
4787
4788         res = bond_check_params(&bonding_defaults);
4789         if (res)
4790                 goto out;
4791
4792         res = register_pernet_subsys(&bond_net_ops);
4793         if (res)
4794                 goto out;
4795
4796         res = rtnl_link_register(&bond_link_ops);
4797         if (res)
4798                 goto err_link;
4799
4800         bond_create_debugfs();
4801
4802         for (i = 0; i < max_bonds; i++) {
4803                 res = bond_create(&init_net, NULL);
4804                 if (res)
4805                         goto err;
4806         }
4807
4808         register_netdevice_notifier(&bond_netdev_notifier);
4809 out:
4810         return res;
4811 err:
4812         rtnl_link_unregister(&bond_link_ops);
4813 err_link:
4814         unregister_pernet_subsys(&bond_net_ops);
4815         goto out;
4816
4817 }
4818
4819 static void __exit bonding_exit(void)
4820 {
4821         unregister_netdevice_notifier(&bond_netdev_notifier);
4822
4823         bond_destroy_debugfs();
4824
4825         rtnl_link_unregister(&bond_link_ops);
4826         unregister_pernet_subsys(&bond_net_ops);
4827
4828 #ifdef CONFIG_NET_POLL_CONTROLLER
4829         /*
4830          * Make sure we don't have an imbalance on our netpoll blocking
4831          */
4832         WARN_ON(atomic_read(&netpoll_block_tx));
4833 #endif
4834 }
4835
4836 module_init(bonding_init);
4837 module_exit(bonding_exit);
4838 MODULE_LICENSE("GPL");
4839 MODULE_VERSION(DRV_VERSION);
4840 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4841 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4842 MODULE_ALIAS_RTNL_LINK("bond");