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/system.h>
  58 #include <asm/dma.h>
  59 #include <linux/uaccess.h>
  60 #include <linux/errno.h>
  61 #include <linux/netdevice.h>
  62 #include <linux/inetdevice.h>
  63 #include <linux/igmp.h>
  64 #include <linux/etherdevice.h>
  65 #include <linux/skbuff.h>
  66 #include <net/sock.h>
  67 #include <linux/rtnetlink.h>
  68 #include <linux/smp.h>
  69 #include <linux/if_ether.h>
  70 #include <net/arp.h>
  71 #include <linux/mii.h>
  72 #include <linux/ethtool.h>
  73 #include <linux/if_vlan.h>
  74 #include <linux/if_bonding.h>
  75 #include <linux/jiffies.h>
  76 #include <linux/preempt.h>
  77 #include <net/route.h>
  78 #include <net/net_namespace.h>
  79 #include <net/netns/generic.h>
  80 #include "bonding.h"
  81 #include "bond_3ad.h"
  82 #include "bond_alb.h"
  83
  84 /*---------------------------- Module parameters ----------------------------*/
  85
  86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  87 #define BOND_LINK_MON_INTERV    0
  88 #define BOND_LINK_ARP_INTERV    0
  89
  90 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  91 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  92 static int num_peer_notif = 1;
  93 static int miimon       = BOND_LINK_MON_INTERV;
  94 static int updelay;
  95 static int downdelay;
  96 static int use_carrier  = 1;
  97 static char *mode;
  98 static char *primary;
  99 static char *primary_reselect;
 100 static char *lacp_rate;
 101 static int min_links;
 102 static char *ad_select;
 103 static char *xmit_hash_policy;
 104 static int arp_interval = BOND_LINK_ARP_INTERV;
 105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 106 static char *arp_validate;
 107 static char *fail_over_mac;
 108 static int all_slaves_active = 0;
 109 static struct bond_params bonding_defaults;
 110 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 111
 112 module_param(max_bonds, int, 0);
 113 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 114 module_param(tx_queues, int, 0);
 115 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 116 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 117 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 118                                "failover event (alias of num_unsol_na)");
 119 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 120 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 121                                "failover event (alias of num_grat_arp)");
 122 module_param(miimon, int, 0);
 123 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 124 module_param(updelay, int, 0);
 125 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 126 module_param(downdelay, int, 0);
 127 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 128                             "in milliseconds");
 129 module_param(use_carrier, int, 0);
 130 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 131                               "0 for off, 1 for on (default)");
 132 module_param(mode, charp, 0);
 133 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 134                        "1 for active-backup, 2 for balance-xor, "
 135                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 136                        "6 for balance-alb");
 137 module_param(primary, charp, 0);
 138 MODULE_PARM_DESC(primary, "Primary network device to use");
 139 module_param(primary_reselect, charp, 0);
 140 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 141                                    "once it comes up; "
 142                                    "0 for always (default), "
 143                                    "1 for only if speed of primary is "
 144                                    "better, "
 145                                    "2 for only on active slave "
 146                                    "failure");
 147 module_param(lacp_rate, charp, 0);
 148 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 149                             "0 for slow, 1 for fast");
 150 module_param(ad_select, charp, 0);
 151 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
 152                             "0 for stable (default), 1 for bandwidth, "
 153                             "2 for count");
 154 module_param(min_links, int, 0);
 155 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 156
 157 module_param(xmit_hash_policy, charp, 0);
 158 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 159                                    "0 for layer 2 (default), 1 for layer 3+4, "
 160                                    "2 for layer 2+3");
 161 module_param(arp_interval, int, 0);
 162 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 163 module_param_array(arp_ip_target, charp, NULL, 0);
 164 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 165 module_param(arp_validate, charp, 0);
 166 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 167                                "0 for none (default), 1 for active, "
 168                                "2 for backup, 3 for all");
 169 module_param(fail_over_mac, charp, 0);
 170 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 171                                 "the same MAC; 0 for none (default), "
 172                                 "1 for active, 2 for follow");
 173 module_param(all_slaves_active, int, 0);
 174 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 175                                      "by setting active flag for all slaves; "
 176                                      "0 for never (default), 1 for always.");
 177 module_param(resend_igmp, int, 0);
 178 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 179                               "link failure");
 180
 181 /*----------------------------- Global variables ----------------------------*/
 182
 183 #ifdef CONFIG_NET_POLL_CONTROLLER
 184 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 185 #endif
 186
 187 int bond_net_id __read_mostly;
 188
 189 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 190 static int arp_ip_count;
 191 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 192 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 193 static int lacp_fast;
 194
 195 const struct bond_parm_tbl bond_lacp_tbl[] = {
 196 {       "slow",         AD_LACP_SLOW},
 197 {       "fast",         AD_LACP_FAST},
 198 {       NULL,           -1},
 199 };
 200
 201 const struct bond_parm_tbl bond_mode_tbl[] = {
 202 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 203 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 204 {       "balance-xor",          BOND_MODE_XOR},
 205 {       "broadcast",            BOND_MODE_BROADCAST},
 206 {       "802.3ad",              BOND_MODE_8023AD},
 207 {       "balance-tlb",          BOND_MODE_TLB},
 208 {       "balance-alb",          BOND_MODE_ALB},
 209 {       NULL,                   -1},
 210 };
 211
 212 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 213 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 214 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 215 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 216 {       NULL,                   -1},
 217 };
 218
 219 const struct bond_parm_tbl arp_validate_tbl[] = {
 220 {       "none",                 BOND_ARP_VALIDATE_NONE},
 221 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 222 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 223 {       "all",                  BOND_ARP_VALIDATE_ALL},
 224 {       NULL,                   -1},
 225 };
 226
 227 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 228 {       "none",                 BOND_FOM_NONE},
 229 {       "active",               BOND_FOM_ACTIVE},
 230 {       "follow",               BOND_FOM_FOLLOW},
 231 {       NULL,                   -1},
 232 };
 233
 234 const struct bond_parm_tbl pri_reselect_tbl[] = {
 235 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 236 {       "better",               BOND_PRI_RESELECT_BETTER},
 237 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 238 {       NULL,                   -1},
 239 };
 240
 241 struct bond_parm_tbl ad_select_tbl[] = {
 242 {       "stable",       BOND_AD_STABLE},
 243 {       "bandwidth",    BOND_AD_BANDWIDTH},
 244 {       "count",        BOND_AD_COUNT},
 245 {       NULL,           -1},
 246 };
 247
 248 /*-------------------------- Forward declarations ---------------------------*/
 249
 250 static int bond_init(struct net_device *bond_dev);
 251 static void bond_uninit(struct net_device *bond_dev);
 252
 253 /*---------------------------- General routines -----------------------------*/
 254
 255 const char *bond_mode_name(int mode)
 256 {
 257         static const char *names[] = {
 258                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 259                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 260                 [BOND_MODE_XOR] = "load balancing (xor)",
 261                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 262                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 263                 [BOND_MODE_TLB] = "transmit load balancing",
 264                 [BOND_MODE_ALB] = "adaptive load balancing",
 265         };
 266
 267         if (mode < 0 || mode > BOND_MODE_ALB)
 268                 return "unknown";
 269
 270         return names[mode];
 271 }
 272
 273 /*---------------------------------- VLAN -----------------------------------*/
 274
 275 /**
 276  * bond_add_vlan - add a new vlan id on bond
 277  * @bond: bond that got the notification
 278  * @vlan_id: the vlan id to add
 279  *
 280  * Returns -ENOMEM if allocation failed.
 281  */
 282 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 283 {
 284         struct vlan_entry *vlan;
 285
 286         pr_debug("bond: %s, vlan id %d\n",
 287                  (bond ? bond->dev->name : "None"), vlan_id);
 288
 289         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 290         if (!vlan)
 291                 return -ENOMEM;
 292
 293         INIT_LIST_HEAD(&vlan->vlan_list);
 294         vlan->vlan_id = vlan_id;
 295
 296         write_lock_bh(&bond->lock);
 297
 298         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 299
 300         write_unlock_bh(&bond->lock);
 301
 302         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 303
 304         return 0;
 305 }
 306
 307 /**
 308  * bond_del_vlan - delete a vlan id from bond
 309  * @bond: bond that got the notification
 310  * @vlan_id: the vlan id to delete
 311  *
 312  * returns -ENODEV if @vlan_id was not found in @bond.
 313  */
 314 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 315 {
 316         struct vlan_entry *vlan;
 317         int res = -ENODEV;
 318
 319         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 320
 321         block_netpoll_tx();
 322         write_lock_bh(&bond->lock);
 323
 324         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 325                 if (vlan->vlan_id == vlan_id) {
 326                         list_del(&vlan->vlan_list);
 327
 328                         if (bond_is_lb(bond))
 329                                 bond_alb_clear_vlan(bond, vlan_id);
 330
 331                         pr_debug("removed VLAN ID %d from bond %s\n",
 332                                  vlan_id, bond->dev->name);
 333
 334                         kfree(vlan);
 335
 336                         res = 0;
 337                         goto out;
 338                 }
 339         }
 340
 341         pr_debug("couldn't find VLAN ID %d in bond %s\n",
 342                  vlan_id, bond->dev->name);
 343
 344 out:
 345         write_unlock_bh(&bond->lock);
 346         unblock_netpoll_tx();
 347         return res;
 348 }
 349
 350 /**
 351  * bond_next_vlan - safely skip to the next item in the vlans list.
 352  * @bond: the bond we're working on
 353  * @curr: item we're advancing from
 354  *
 355  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 356  * or @curr->next otherwise (even if it is @curr itself again).
 357  *
 358  * Caller must hold bond->lock
 359  */
 360 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 361 {
 362         struct vlan_entry *next, *last;
 363
 364         if (list_empty(&bond->vlan_list))
 365                 return NULL;
 366
 367         if (!curr) {
 368                 next = list_entry(bond->vlan_list.next,
 369                                   struct vlan_entry, vlan_list);
 370         } else {
 371                 last = list_entry(bond->vlan_list.prev,
 372                                   struct vlan_entry, vlan_list);
 373                 if (last == curr) {
 374                         next = list_entry(bond->vlan_list.next,
 375                                           struct vlan_entry, vlan_list);
 376                 } else {
 377                         next = list_entry(curr->vlan_list.next,
 378                                           struct vlan_entry, vlan_list);
 379                 }
 380         }
 381
 382         return next;
 383 }
 384
 385 #define bond_queue_mapping(skb) (*(u16 *)((skb)->cb))
 386
 387 /**
 388  * bond_dev_queue_xmit - Prepare skb for xmit.
 389  *
 390  * @bond: bond device that got this skb for tx.
 391  * @skb: hw accel VLAN tagged skb to transmit
 392  * @slave_dev: slave that is supposed to xmit this skbuff
 393  */
 394 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 395                         struct net_device *slave_dev)
 396 {
 397         skb->dev = slave_dev;
 398
 399         skb->queue_mapping = bond_queue_mapping(skb);
 400
 401         if (unlikely(netpoll_tx_running(slave_dev)))
 402                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 403         else
 404                 dev_queue_xmit(skb);
 405
 406         return 0;
 407 }
 408
 409 /*
 410  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 411  * We don't protect the slave list iteration with a lock because:
 412  * a. This operation is performed in IOCTL context,
 413  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 414  * c. Holding a lock with BH disabled while directly calling a base driver
 415  *    entry point is generally a BAD idea.
 416  *
 417  * The design of synchronization/protection for this operation in the 8021q
 418  * module is good for one or more VLAN devices over a single physical device
 419  * and cannot be extended for a teaming solution like bonding, so there is a
 420  * potential race condition here where a net device from the vlan group might
 421  * be referenced (either by a base driver or the 8021q code) while it is being
 422  * removed from the system. However, it turns out we're not making matters
 423  * worse, and if it works for regular VLAN usage it will work here too.
 424 */
 425
 426 /**
 427  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 428  * @bond_dev: bonding net device that got called
 429  * @vid: vlan id being added
 430  */
 431 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 432 {
 433         struct bonding *bond = netdev_priv(bond_dev);
 434         struct slave *slave;
 435         int i, res;
 436
 437         bond_for_each_slave(bond, slave, i) {
 438                 struct net_device *slave_dev = slave->dev;
 439                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 440
 441                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 442                     slave_ops->ndo_vlan_rx_add_vid) {
 443                         slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
 444                 }
 445         }
 446
 447         res = bond_add_vlan(bond, vid);
 448         if (res) {
 449                 pr_err("%s: Error: Failed to add vlan id %d\n",
 450                        bond_dev->name, vid);
 451         }
 452 }
 453
 454 /**
 455  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 456  * @bond_dev: bonding net device that got called
 457  * @vid: vlan id being removed
 458  */
 459 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 460 {
 461         struct bonding *bond = netdev_priv(bond_dev);
 462         struct slave *slave;
 463         int i, res;
 464
 465         bond_for_each_slave(bond, slave, i) {
 466                 struct net_device *slave_dev = slave->dev;
 467                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 468
 469                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 470                     slave_ops->ndo_vlan_rx_kill_vid) {
 471                         slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
 472                 }
 473         }
 474
 475         res = bond_del_vlan(bond, vid);
 476         if (res) {
 477                 pr_err("%s: Error: Failed to remove vlan id %d\n",
 478                        bond_dev->name, vid);
 479         }
 480 }
 481
 482 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 483 {
 484         struct vlan_entry *vlan;
 485         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 486
 487         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 488             !(slave_ops->ndo_vlan_rx_add_vid))
 489                 return;
 490
 491         list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
 492                 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 493 }
 494
 495 static void bond_del_vlans_from_slave(struct bonding *bond,
 496                                       struct net_device *slave_dev)
 497 {
 498         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 499         struct vlan_entry *vlan;
 500
 501         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 502             !(slave_ops->ndo_vlan_rx_kill_vid))
 503                 return;
 504
 505         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 506                 if (!vlan->vlan_id)
 507                         continue;
 508                 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 509         }
 510 }
 511
 512 /*------------------------------- Link status -------------------------------*/
 513
 514 /*
 515  * Set the carrier state for the master according to the state of its
 516  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 517  * do special 802.3ad magic.
 518  *
 519  * Returns zero if carrier state does not change, nonzero if it does.
 520  */
 521 static int bond_set_carrier(struct bonding *bond)
 522 {
 523         struct slave *slave;
 524         int i;
 525
 526         if (bond->slave_cnt == 0)
 527                 goto down;
 528
 529         if (bond->params.mode == BOND_MODE_8023AD)
 530                 return bond_3ad_set_carrier(bond);
 531
 532         bond_for_each_slave(bond, slave, i) {
 533                 if (slave->link == BOND_LINK_UP) {
 534                         if (!netif_carrier_ok(bond->dev)) {
 535                                 netif_carrier_on(bond->dev);
 536                                 return 1;
 537                         }
 538                         return 0;
 539                 }
 540         }
 541
 542 down:
 543         if (netif_carrier_ok(bond->dev)) {
 544                 netif_carrier_off(bond->dev);
 545                 return 1;
 546         }
 547         return 0;
 548 }
 549
 550 /*
 551  * Get link speed and duplex from the slave's base driver
 552  * using ethtool. If for some reason the call fails or the
 553  * values are invalid, set speed and duplex to -1,
 554  * and return error.
 555  */
 556 static int bond_update_speed_duplex(struct slave *slave)
 557 {
 558         struct net_device *slave_dev = slave->dev;
 559         struct ethtool_cmd ecmd;
 560         u32 slave_speed;
 561         int res;
 562
 563         slave->speed = SPEED_UNKNOWN;
 564         slave->duplex = DUPLEX_UNKNOWN;
 565
 566         res = __ethtool_get_settings(slave_dev, &ecmd);
 567         if (res < 0)
 568                 return -1;
 569
 570         slave_speed = ethtool_cmd_speed(&ecmd);
 571         if (slave_speed == 0 || slave_speed == ((__u32) -1))
 572                 return -1;
 573
 574         switch (ecmd.duplex) {
 575         case DUPLEX_FULL:
 576         case DUPLEX_HALF:
 577                 break;
 578         default:
 579                 return -1;
 580         }
 581
 582         slave->speed = slave_speed;
 583         slave->duplex = ecmd.duplex;
 584
 585         return 0;
 586 }
 587
 588 /*
 589  * if <dev> supports MII link status reporting, check its link status.
 590  *
 591  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 592  * depending upon the setting of the use_carrier parameter.
 593  *
 594  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 595  * can't tell and just pretend it is), or 0, meaning that the link is
 596  * down.
 597  *
 598  * If reporting is non-zero, instead of faking link up, return -1 if
 599  * both ETHTOOL and MII ioctls fail (meaning the device does not
 600  * support them).  If use_carrier is set, return whatever it says.
 601  * It'd be nice if there was a good way to tell if a driver supports
 602  * netif_carrier, but there really isn't.
 603  */
 604 static int bond_check_dev_link(struct bonding *bond,
 605                                struct net_device *slave_dev, int reporting)
 606 {
 607         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 608         int (*ioctl)(struct net_device *, struct ifreq *, int);
 609         struct ifreq ifr;
 610         struct mii_ioctl_data *mii;
 611
 612         if (!reporting && !netif_running(slave_dev))
 613                 return 0;
 614
 615         if (bond->params.use_carrier)
 616                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 617
 618         /* Try to get link status using Ethtool first. */
 619         if (slave_dev->ethtool_ops) {
 620                 if (slave_dev->ethtool_ops->get_link) {
 621                         u32 link;
 622
 623                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 624
 625                         return link ? BMSR_LSTATUS : 0;
 626                 }
 627         }
 628
 629         /* Ethtool can't be used, fallback to MII ioctls. */
 630         ioctl = slave_ops->ndo_do_ioctl;
 631         if (ioctl) {
 632                 /* TODO: set pointer to correct ioctl on a per team member */
 633                 /*       bases to make this more efficient. that is, once  */
 634                 /*       we determine the correct ioctl, we will always    */
 635                 /*       call it and not the others for that team          */
 636                 /*       member.                                           */
 637
 638                 /*
 639                  * We cannot assume that SIOCGMIIPHY will also read a
 640                  * register; not all network drivers (e.g., e100)
 641                  * support that.
 642                  */
 643
 644                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 645                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 646                 mii = if_mii(&ifr);
 647                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 648                         mii->reg_num = MII_BMSR;
 649                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 650                                 return mii->val_out & BMSR_LSTATUS;
 651                 }
 652         }
 653
 654         /*
 655          * If reporting, report that either there's no dev->do_ioctl,
 656          * or both SIOCGMIIREG and get_link failed (meaning that we
 657          * cannot report link status).  If not reporting, pretend
 658          * we're ok.
 659          */
 660         return reporting ? -1 : BMSR_LSTATUS;
 661 }
 662
 663 /*----------------------------- Multicast list ------------------------------*/
 664
 665 /*
 666  * Push the promiscuity flag down to appropriate slaves
 667  */
 668 static int bond_set_promiscuity(struct bonding *bond, int inc)
 669 {
 670         int err = 0;
 671         if (USES_PRIMARY(bond->params.mode)) {
 672                 /* write lock already acquired */
 673                 if (bond->curr_active_slave) {
 674                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 675                                                   inc);
 676                 }
 677         } else {
 678                 struct slave *slave;
 679                 int i;
 680                 bond_for_each_slave(bond, slave, i) {
 681                         err = dev_set_promiscuity(slave->dev, inc);
 682                         if (err)
 683                                 return err;
 684                 }
 685         }
 686         return err;
 687 }
 688
 689 /*
 690  * Push the allmulti flag down to all slaves
 691  */
 692 static int bond_set_allmulti(struct bonding *bond, int inc)
 693 {
 694         int err = 0;
 695         if (USES_PRIMARY(bond->params.mode)) {
 696                 /* write lock already acquired */
 697                 if (bond->curr_active_slave) {
 698                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 699                                                inc);
 700                 }
 701         } else {
 702                 struct slave *slave;
 703                 int i;
 704                 bond_for_each_slave(bond, slave, i) {
 705                         err = dev_set_allmulti(slave->dev, inc);
 706                         if (err)
 707                                 return err;
 708                 }
 709         }
 710         return err;
 711 }
 712
 713 /*
 714  * Add a Multicast address to slaves
 715  * according to mode
 716  */
 717 static void bond_mc_add(struct bonding *bond, void *addr)
 718 {
 719         if (USES_PRIMARY(bond->params.mode)) {
 720                 /* write lock already acquired */
 721                 if (bond->curr_active_slave)
 722                         dev_mc_add(bond->curr_active_slave->dev, addr);
 723         } else {
 724                 struct slave *slave;
 725                 int i;
 726
 727                 bond_for_each_slave(bond, slave, i)
 728                         dev_mc_add(slave->dev, addr);
 729         }
 730 }
 731
 732 /*
 733  * Remove a multicast address from slave
 734  * according to mode
 735  */
 736 static void bond_mc_del(struct bonding *bond, void *addr)
 737 {
 738         if (USES_PRIMARY(bond->params.mode)) {
 739                 /* write lock already acquired */
 740                 if (bond->curr_active_slave)
 741                         dev_mc_del(bond->curr_active_slave->dev, addr);
 742         } else {
 743                 struct slave *slave;
 744                 int i;
 745                 bond_for_each_slave(bond, slave, i) {
 746                         dev_mc_del(slave->dev, addr);
 747                 }
 748         }
 749 }
 750
 751
 752 static void __bond_resend_igmp_join_requests(struct net_device *dev)
 753 {
 754         struct in_device *in_dev;
 755
 756         rcu_read_lock();
 757         in_dev = __in_dev_get_rcu(dev);
 758         if (in_dev)
 759                 ip_mc_rejoin_groups(in_dev);
 760         rcu_read_unlock();
 761 }
 762
 763 /*
 764  * Retrieve the list of registered multicast addresses for the bonding
 765  * device and retransmit an IGMP JOIN request to the current active
 766  * slave.
 767  */
 768 static void bond_resend_igmp_join_requests(struct bonding *bond)
 769 {
 770         struct net_device *vlan_dev;
 771         struct vlan_entry *vlan;
 772
 773         read_lock(&bond->lock);
 774
 775         /* rejoin all groups on bond device */
 776         __bond_resend_igmp_join_requests(bond->dev);
 777
 778         /* rejoin all groups on vlan devices */
 779         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 780                 rcu_read_lock();
 781                 vlan_dev = __vlan_find_dev_deep(bond->dev,
 782                                                 vlan->vlan_id);
 783                 rcu_read_unlock();
 784                 if (vlan_dev)
 785                         __bond_resend_igmp_join_requests(vlan_dev);
 786         }
 787
 788         if (--bond->igmp_retrans > 0)
 789                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 790
 791         read_unlock(&bond->lock);
 792 }
 793
 794 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 795 {
 796         struct bonding *bond = container_of(work, struct bonding,
 797                                             mcast_work.work);
 798         bond_resend_igmp_join_requests(bond);
 799 }
 800
 801 /*
 802  * flush all members of flush->mc_list from device dev->mc_list
 803  */
 804 static void bond_mc_list_flush(struct net_device *bond_dev,
 805                                struct net_device *slave_dev)
 806 {
 807         struct bonding *bond = netdev_priv(bond_dev);
 808         struct netdev_hw_addr *ha;
 809
 810         netdev_for_each_mc_addr(ha, bond_dev)
 811                 dev_mc_del(slave_dev, ha->addr);
 812
 813         if (bond->params.mode == BOND_MODE_8023AD) {
 814                 /* del lacpdu mc addr from mc list */
 815                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 816
 817                 dev_mc_del(slave_dev, lacpdu_multicast);
 818         }
 819 }
 820
 821 /*--------------------------- Active slave change ---------------------------*/
 822
 823 /*
 824  * Update the mc list and multicast-related flags for the new and
 825  * old active slaves (if any) according to the multicast mode, and
 826  * promiscuous flags unconditionally.
 827  */
 828 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
 829                          struct slave *old_active)
 830 {
 831         struct netdev_hw_addr *ha;
 832
 833         if (!USES_PRIMARY(bond->params.mode))
 834                 /* nothing to do -  mc list is already up-to-date on
 835                  * all slaves
 836                  */
 837                 return;
 838
 839         if (old_active) {
 840                 if (bond->dev->flags & IFF_PROMISC)
 841                         dev_set_promiscuity(old_active->dev, -1);
 842
 843                 if (bond->dev->flags & IFF_ALLMULTI)
 844                         dev_set_allmulti(old_active->dev, -1);
 845
 846                 netdev_for_each_mc_addr(ha, bond->dev)
 847                         dev_mc_del(old_active->dev, ha->addr);
 848         }
 849
 850         if (new_active) {
 851                 /* FIXME: Signal errors upstream. */
 852                 if (bond->dev->flags & IFF_PROMISC)
 853                         dev_set_promiscuity(new_active->dev, 1);
 854
 855                 if (bond->dev->flags & IFF_ALLMULTI)
 856                         dev_set_allmulti(new_active->dev, 1);
 857
 858                 netdev_for_each_mc_addr(ha, bond->dev)
 859                         dev_mc_add(new_active->dev, ha->addr);
 860         }
 861 }
 862
 863 /*
 864  * bond_do_fail_over_mac
 865  *
 866  * Perform special MAC address swapping for fail_over_mac settings
 867  *
 868  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 869  */
 870 static void bond_do_fail_over_mac(struct bonding *bond,
 871                                   struct slave *new_active,
 872                                   struct slave *old_active)
 873         __releases(&bond->curr_slave_lock)
 874         __releases(&bond->lock)
 875         __acquires(&bond->lock)
 876         __acquires(&bond->curr_slave_lock)
 877 {
 878         u8 tmp_mac[ETH_ALEN];
 879         struct sockaddr saddr;
 880         int rv;
 881
 882         switch (bond->params.fail_over_mac) {
 883         case BOND_FOM_ACTIVE:
 884                 if (new_active)
 885                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
 886                                new_active->dev->addr_len);
 887                 break;
 888         case BOND_FOM_FOLLOW:
 889                 /*
 890                  * if new_active && old_active, swap them
 891                  * if just old_active, do nothing (going to no active slave)
 892                  * if just new_active, set new_active to bond's MAC
 893                  */
 894                 if (!new_active)
 895                         return;
 896
 897                 write_unlock_bh(&bond->curr_slave_lock);
 898                 read_unlock(&bond->lock);
 899
 900                 if (old_active) {
 901                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
 902                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
 903                                ETH_ALEN);
 904                         saddr.sa_family = new_active->dev->type;
 905                 } else {
 906                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
 907                         saddr.sa_family = bond->dev->type;
 908                 }
 909
 910                 rv = dev_set_mac_address(new_active->dev, &saddr);
 911                 if (rv) {
 912                         pr_err("%s: Error %d setting MAC of slave %s\n",
 913                                bond->dev->name, -rv, new_active->dev->name);
 914                         goto out;
 915                 }
 916
 917                 if (!old_active)
 918                         goto out;
 919
 920                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
 921                 saddr.sa_family = old_active->dev->type;
 922
 923                 rv = dev_set_mac_address(old_active->dev, &saddr);
 924                 if (rv)
 925                         pr_err("%s: Error %d setting MAC of slave %s\n",
 926                                bond->dev->name, -rv, new_active->dev->name);
 927 out:
 928                 read_lock(&bond->lock);
 929                 write_lock_bh(&bond->curr_slave_lock);
 930                 break;
 931         default:
 932                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
 933                        bond->dev->name, bond->params.fail_over_mac);
 934                 break;
 935         }
 936
 937 }
 938
 939 static bool bond_should_change_active(struct bonding *bond)
 940 {
 941         struct slave *prim = bond->primary_slave;
 942         struct slave *curr = bond->curr_active_slave;
 943
 944         if (!prim || !curr || curr->link != BOND_LINK_UP)
 945                 return true;
 946         if (bond->force_primary) {
 947                 bond->force_primary = false;
 948                 return true;
 949         }
 950         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
 951             (prim->speed < curr->speed ||
 952              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
 953                 return false;
 954         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
 955                 return false;
 956         return true;
 957 }
 958
 959 /**
 960  * find_best_interface - select the best available slave to be the active one
 961  * @bond: our bonding struct
 962  *
 963  * Warning: Caller must hold curr_slave_lock for writing.
 964  */
 965 static struct slave *bond_find_best_slave(struct bonding *bond)
 966 {
 967         struct slave *new_active, *old_active;
 968         struct slave *bestslave = NULL;
 969         int mintime = bond->params.updelay;
 970         int i;
 971
 972         new_active = bond->curr_active_slave;
 973
 974         if (!new_active) { /* there were no active slaves left */
 975                 if (bond->slave_cnt > 0)   /* found one slave */
 976                         new_active = bond->first_slave;
 977                 else
 978                         return NULL; /* still no slave, return NULL */
 979         }
 980
 981         if ((bond->primary_slave) &&
 982             bond->primary_slave->link == BOND_LINK_UP &&
 983             bond_should_change_active(bond)) {
 984                 new_active = bond->primary_slave;
 985         }
 986
 987         /* remember where to stop iterating over the slaves */
 988         old_active = new_active;
 989
 990         bond_for_each_slave_from(bond, new_active, i, old_active) {
 991                 if (new_active->link == BOND_LINK_UP) {
 992                         return new_active;
 993                 } else if (new_active->link == BOND_LINK_BACK &&
 994                            IS_UP(new_active->dev)) {
 995                         /* link up, but waiting for stabilization */
 996                         if (new_active->delay < mintime) {
 997                                 mintime = new_active->delay;
 998                                 bestslave = new_active;
 999                         }
1000                 }
1001         }
1002
1003         return bestslave;
1004 }
1005
1006 static bool bond_should_notify_peers(struct bonding *bond)
1007 {
1008         struct slave *slave = bond->curr_active_slave;
1009
1010         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1011                  bond->dev->name, slave ? slave->dev->name : "NULL");
1012
1013         if (!slave || !bond->send_peer_notif ||
1014             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1015                 return false;
1016
1017         bond->send_peer_notif--;
1018         return true;
1019 }
1020
1021 /**
1022  * change_active_interface - change the active slave into the specified one
1023  * @bond: our bonding struct
1024  * @new: the new slave to make the active one
1025  *
1026  * Set the new slave to the bond's settings and unset them on the old
1027  * curr_active_slave.
1028  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1029  *
1030  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1031  * because it is apparently the best available slave we have, even though its
1032  * updelay hasn't timed out yet.
1033  *
1034  * If new_active is not NULL, caller must hold bond->lock for read and
1035  * curr_slave_lock for write_bh.
1036  */
1037 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1038 {
1039         struct slave *old_active = bond->curr_active_slave;
1040
1041         if (old_active == new_active)
1042                 return;
1043
1044         if (new_active) {
1045                 new_active->jiffies = jiffies;
1046
1047                 if (new_active->link == BOND_LINK_BACK) {
1048                         if (USES_PRIMARY(bond->params.mode)) {
1049                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1050                                         bond->dev->name, new_active->dev->name,
1051                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
1052                         }
1053
1054                         new_active->delay = 0;
1055                         new_active->link = BOND_LINK_UP;
1056
1057                         if (bond->params.mode == BOND_MODE_8023AD)
1058                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1059
1060                         if (bond_is_lb(bond))
1061                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1062                 } else {
1063                         if (USES_PRIMARY(bond->params.mode)) {
1064                                 pr_info("%s: making interface %s the new active one.\n",
1065                                         bond->dev->name, new_active->dev->name);
1066                         }
1067                 }
1068         }
1069
1070         if (USES_PRIMARY(bond->params.mode))
1071                 bond_mc_swap(bond, new_active, old_active);
1072
1073         if (bond_is_lb(bond)) {
1074                 bond_alb_handle_active_change(bond, new_active);
1075                 if (old_active)
1076                         bond_set_slave_inactive_flags(old_active);
1077                 if (new_active)
1078                         bond_set_slave_active_flags(new_active);
1079         } else {
1080                 bond->curr_active_slave = new_active;
1081         }
1082
1083         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1084                 if (old_active)
1085                         bond_set_slave_inactive_flags(old_active);
1086
1087                 if (new_active) {
1088                         bool should_notify_peers = false;
1089
1090                         bond_set_slave_active_flags(new_active);
1091
1092                         if (bond->params.fail_over_mac)
1093                                 bond_do_fail_over_mac(bond, new_active,
1094                                                       old_active);
1095
1096                         if (netif_running(bond->dev)) {
1097                                 bond->send_peer_notif =
1098                                         bond->params.num_peer_notif;
1099                                 should_notify_peers =
1100                                         bond_should_notify_peers(bond);
1101                         }
1102
1103                         write_unlock_bh(&bond->curr_slave_lock);
1104                         read_unlock(&bond->lock);
1105
1106                         netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1107                         if (should_notify_peers)
1108                                 netdev_bonding_change(bond->dev,
1109                                                       NETDEV_NOTIFY_PEERS);
1110
1111                         read_lock(&bond->lock);
1112                         write_lock_bh(&bond->curr_slave_lock);
1113                 }
1114         }
1115
1116         /* resend IGMP joins since active slave has changed or
1117          * all were sent on curr_active_slave.
1118          * resend only if bond is brought up with the affected
1119          * bonding modes and the retransmission is enabled */
1120         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1121             ((USES_PRIMARY(bond->params.mode) && new_active) ||
1122              bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1123                 bond->igmp_retrans = bond->params.resend_igmp;
1124                 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1125         }
1126 }
1127
1128 /**
1129  * bond_select_active_slave - select a new active slave, if needed
1130  * @bond: our bonding struct
1131  *
1132  * This functions should be called when one of the following occurs:
1133  * - The old curr_active_slave has been released or lost its link.
1134  * - The primary_slave has got its link back.
1135  * - A slave has got its link back and there's no old curr_active_slave.
1136  *
1137  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1138  */
1139 void bond_select_active_slave(struct bonding *bond)
1140 {
1141         struct slave *best_slave;
1142         int rv;
1143
1144         best_slave = bond_find_best_slave(bond);
1145         if (best_slave != bond->curr_active_slave) {
1146                 bond_change_active_slave(bond, best_slave);
1147                 rv = bond_set_carrier(bond);
1148                 if (!rv)
1149                         return;
1150
1151                 if (netif_carrier_ok(bond->dev)) {
1152                         pr_info("%s: first active interface up!\n",
1153                                 bond->dev->name);
1154                 } else {
1155                         pr_info("%s: now running without any active interface !\n",
1156                                 bond->dev->name);
1157                 }
1158         }
1159 }
1160
1161 /*--------------------------- slave list handling ---------------------------*/
1162
1163 /*
1164  * This function attaches the slave to the end of list.
1165  *
1166  * bond->lock held for writing by caller.
1167  */
1168 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1169 {
1170         if (bond->first_slave == NULL) { /* attaching the first slave */
1171                 new_slave->next = new_slave;
1172                 new_slave->prev = new_slave;
1173                 bond->first_slave = new_slave;
1174         } else {
1175                 new_slave->next = bond->first_slave;
1176                 new_slave->prev = bond->first_slave->prev;
1177                 new_slave->next->prev = new_slave;
1178                 new_slave->prev->next = new_slave;
1179         }
1180
1181         bond->slave_cnt++;
1182 }
1183
1184 /*
1185  * This function detaches the slave from the list.
1186  * WARNING: no check is made to verify if the slave effectively
1187  * belongs to <bond>.
1188  * Nothing is freed on return, structures are just unchained.
1189  * If any slave pointer in bond was pointing to <slave>,
1190  * it should be changed by the calling function.
1191  *
1192  * bond->lock held for writing by caller.
1193  */
1194 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1195 {
1196         if (slave->next)
1197                 slave->next->prev = slave->prev;
1198
1199         if (slave->prev)
1200                 slave->prev->next = slave->next;
1201
1202         if (bond->first_slave == slave) { /* slave is the first slave */
1203                 if (bond->slave_cnt > 1) { /* there are more slave */
1204                         bond->first_slave = slave->next;
1205                 } else {
1206                         bond->first_slave = NULL; /* slave was the last one */
1207                 }
1208         }
1209
1210         slave->next = NULL;
1211         slave->prev = NULL;
1212         bond->slave_cnt--;
1213 }
1214
1215 #ifdef CONFIG_NET_POLL_CONTROLLER
1216 static inline int slave_enable_netpoll(struct slave *slave)
1217 {
1218         struct netpoll *np;
1219         int err = 0;
1220
1221         np = kzalloc(sizeof(*np), GFP_KERNEL);
1222         err = -ENOMEM;
1223         if (!np)
1224                 goto out;
1225
1226         np->dev = slave->dev;
1227         strlcpy(np->dev_name, slave->dev->name, IFNAMSIZ);
1228         err = __netpoll_setup(np);
1229         if (err) {
1230                 kfree(np);
1231                 goto out;
1232         }
1233         slave->np = np;
1234 out:
1235         return err;
1236 }
1237 static inline void slave_disable_netpoll(struct slave *slave)
1238 {
1239         struct netpoll *np = slave->np;
1240
1241         if (!np)
1242                 return;
1243
1244         slave->np = NULL;
1245         synchronize_rcu_bh();
1246         __netpoll_cleanup(np);
1247         kfree(np);
1248 }
1249 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1250 {
1251         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1252                 return false;
1253         if (!slave_dev->netdev_ops->ndo_poll_controller)
1254                 return false;
1255         return true;
1256 }
1257
1258 static void bond_poll_controller(struct net_device *bond_dev)
1259 {
1260 }
1261
1262 static void __bond_netpoll_cleanup(struct bonding *bond)
1263 {
1264         struct slave *slave;
1265         int i;
1266
1267         bond_for_each_slave(bond, slave, i)
1268                 if (IS_UP(slave->dev))
1269                         slave_disable_netpoll(slave);
1270 }
1271 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1272 {
1273         struct bonding *bond = netdev_priv(bond_dev);
1274
1275         read_lock(&bond->lock);
1276         __bond_netpoll_cleanup(bond);
1277         read_unlock(&bond->lock);
1278 }
1279
1280 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1281 {
1282         struct bonding *bond = netdev_priv(dev);
1283         struct slave *slave;
1284         int i, err = 0;
1285
1286         read_lock(&bond->lock);
1287         bond_for_each_slave(bond, slave, i) {
1288                 err = slave_enable_netpoll(slave);
1289                 if (err) {
1290                         __bond_netpoll_cleanup(bond);
1291                         break;
1292                 }
1293         }
1294         read_unlock(&bond->lock);
1295         return err;
1296 }
1297
1298 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1299 {
1300         return bond->dev->npinfo;
1301 }
1302
1303 #else
1304 static inline int slave_enable_netpoll(struct slave *slave)
1305 {
1306         return 0;
1307 }
1308 static inline void slave_disable_netpoll(struct slave *slave)
1309 {
1310 }
1311 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1312 {
1313 }
1314 #endif
1315
1316 /*---------------------------------- IOCTL ----------------------------------*/
1317
1318 static int bond_sethwaddr(struct net_device *bond_dev,
1319                           struct net_device *slave_dev)
1320 {
1321         pr_debug("bond_dev=%p\n", bond_dev);
1322         pr_debug("slave_dev=%p\n", slave_dev);
1323         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1324         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1325         return 0;
1326 }
1327
1328 static netdev_features_t bond_fix_features(struct net_device *dev,
1329         netdev_features_t features)
1330 {
1331         struct slave *slave;
1332         struct bonding *bond = netdev_priv(dev);
1333         netdev_features_t mask;
1334         int i;
1335
1336         read_lock(&bond->lock);
1337
1338         if (!bond->first_slave) {
1339                 /* Disable adding VLANs to empty bond. But why? --mq */
1340                 features |= NETIF_F_VLAN_CHALLENGED;
1341                 goto out;
1342         }
1343
1344         mask = features;
1345         features &= ~NETIF_F_ONE_FOR_ALL;
1346         features |= NETIF_F_ALL_FOR_ALL;
1347
1348         bond_for_each_slave(bond, slave, i) {
1349                 features = netdev_increment_features(features,
1350                                                      slave->dev->features,
1351                                                      mask);
1352         }
1353
1354 out:
1355         read_unlock(&bond->lock);
1356         return features;
1357 }
1358
1359 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1360                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1361                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1362
1363 static void bond_compute_features(struct bonding *bond)
1364 {
1365         struct slave *slave;
1366         struct net_device *bond_dev = bond->dev;
1367         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1368         unsigned short max_hard_header_len = ETH_HLEN;
1369         int i;
1370
1371         read_lock(&bond->lock);
1372
1373         if (!bond->first_slave)
1374                 goto done;
1375
1376         bond_for_each_slave(bond, slave, i) {
1377                 vlan_features = netdev_increment_features(vlan_features,
1378                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1379
1380                 if (slave->dev->hard_header_len > max_hard_header_len)
1381                         max_hard_header_len = slave->dev->hard_header_len;
1382         }
1383
1384 done:
1385         bond_dev->vlan_features = vlan_features;
1386         bond_dev->hard_header_len = max_hard_header_len;
1387
1388         read_unlock(&bond->lock);
1389
1390         netdev_change_features(bond_dev);
1391 }
1392
1393 static void bond_setup_by_slave(struct net_device *bond_dev,
1394                                 struct net_device *slave_dev)
1395 {
1396         struct bonding *bond = netdev_priv(bond_dev);
1397
1398         bond_dev->header_ops        = slave_dev->header_ops;
1399
1400         bond_dev->type              = slave_dev->type;
1401         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1402         bond_dev->addr_len          = slave_dev->addr_len;
1403
1404         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1405                 slave_dev->addr_len);
1406         bond->setup_by_slave = 1;
1407 }
1408
1409 /* On bonding slaves other than the currently active slave, suppress
1410  * duplicates except for alb non-mcast/bcast.
1411  */
1412 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1413                                             struct slave *slave,
1414                                             struct bonding *bond)
1415 {
1416         if (bond_is_slave_inactive(slave)) {
1417                 if (bond->params.mode == BOND_MODE_ALB &&
1418                     skb->pkt_type != PACKET_BROADCAST &&
1419                     skb->pkt_type != PACKET_MULTICAST)
1420                         return false;
1421                 return true;
1422         }
1423         return false;
1424 }
1425
1426 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1427 {
1428         struct sk_buff *skb = *pskb;
1429         struct slave *slave;
1430         struct bonding *bond;
1431         void (*recv_probe)(struct sk_buff *, struct bonding *,
1432                                 struct slave *);
1433
1434         skb = skb_share_check(skb, GFP_ATOMIC);
1435         if (unlikely(!skb))
1436                 return RX_HANDLER_CONSUMED;
1437
1438         *pskb = skb;
1439
1440         slave = bond_slave_get_rcu(skb->dev);
1441         bond = slave->bond;
1442
1443         if (bond->params.arp_interval)
1444                 slave->dev->last_rx = jiffies;
1445
1446         recv_probe = ACCESS_ONCE(bond->recv_probe);
1447         if (recv_probe) {
1448                 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
1449
1450                 if (likely(nskb)) {
1451                         recv_probe(nskb, bond, slave);
1452                         dev_kfree_skb(nskb);
1453                 }
1454         }
1455
1456         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1457                 return RX_HANDLER_EXACT;
1458         }
1459
1460         skb->dev = bond->dev;
1461
1462         if (bond->params.mode == BOND_MODE_ALB &&
1463             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1464             skb->pkt_type == PACKET_HOST) {
1465
1466                 if (unlikely(skb_cow_head(skb,
1467                                           skb->data - skb_mac_header(skb)))) {
1468                         kfree_skb(skb);
1469                         return RX_HANDLER_CONSUMED;
1470                 }
1471                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1472         }
1473
1474         return RX_HANDLER_ANOTHER;
1475 }
1476
1477 /* enslave device <slave> to bond device <master> */
1478 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1479 {
1480         struct bonding *bond = netdev_priv(bond_dev);
1481         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1482         struct slave *new_slave = NULL;
1483         struct netdev_hw_addr *ha;
1484         struct sockaddr addr;
1485         int link_reporting;
1486         int res = 0;
1487
1488         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1489                 slave_ops->ndo_do_ioctl == NULL) {
1490                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1491                            bond_dev->name, slave_dev->name);
1492         }
1493
1494         /* already enslaved */
1495         if (slave_dev->flags & IFF_SLAVE) {
1496                 pr_debug("Error, Device was already enslaved\n");
1497                 return -EBUSY;
1498         }
1499
1500         /* vlan challenged mutual exclusion */
1501         /* no need to lock since we're protected by rtnl_lock */
1502         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1503                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1504                 if (bond_vlan_used(bond)) {
1505                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1506                                bond_dev->name, slave_dev->name, bond_dev->name);
1507                         return -EPERM;
1508                 } else {
1509                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1510                                    bond_dev->name, slave_dev->name,
1511                                    slave_dev->name, bond_dev->name);
1512                 }
1513         } else {
1514                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1515         }
1516
1517         /*
1518          * Old ifenslave binaries are no longer supported.  These can
1519          * be identified with moderate accuracy by the state of the slave:
1520          * the current ifenslave will set the interface down prior to
1521          * enslaving it; the old ifenslave will not.
1522          */
1523         if ((slave_dev->flags & IFF_UP)) {
1524                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1525                        slave_dev->name);
1526                 res = -EPERM;
1527                 goto err_undo_flags;
1528         }
1529
1530         /* set bonding device ether type by slave - bonding netdevices are
1531          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1532          * there is a need to override some of the type dependent attribs/funcs.
1533          *
1534          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1535          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1536          */
1537         if (bond->slave_cnt == 0) {
1538                 if (bond_dev->type != slave_dev->type) {
1539                         pr_debug("%s: change device type from %d to %d\n",
1540                                  bond_dev->name,
1541                                  bond_dev->type, slave_dev->type);
1542
1543                         res = netdev_bonding_change(bond_dev,
1544                                                     NETDEV_PRE_TYPE_CHANGE);
1545                         res = notifier_to_errno(res);
1546                         if (res) {
1547                                 pr_err("%s: refused to change device type\n",
1548                                        bond_dev->name);
1549                                 res = -EBUSY;
1550                                 goto err_undo_flags;
1551                         }
1552
1553                         /* Flush unicast and multicast addresses */
1554                         dev_uc_flush(bond_dev);
1555                         dev_mc_flush(bond_dev);
1556
1557                         if (slave_dev->type != ARPHRD_ETHER)
1558                                 bond_setup_by_slave(bond_dev, slave_dev);
1559                         else {
1560                                 ether_setup(bond_dev);
1561                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1562                         }
1563
1564                         netdev_bonding_change(bond_dev,
1565                                               NETDEV_POST_TYPE_CHANGE);
1566                 }
1567         } else if (bond_dev->type != slave_dev->type) {
1568                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1569                        slave_dev->name,
1570                        slave_dev->type, bond_dev->type);
1571                 res = -EINVAL;
1572                 goto err_undo_flags;
1573         }
1574
1575         if (slave_ops->ndo_set_mac_address == NULL) {
1576                 if (bond->slave_cnt == 0) {
1577                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1578                                    bond_dev->name);
1579                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1580                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1581                         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",
1582                                bond_dev->name);
1583                         res = -EOPNOTSUPP;
1584                         goto err_undo_flags;
1585                 }
1586         }
1587
1588         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1589
1590         /* If this is the first slave, then we need to set the master's hardware
1591          * address to be the same as the slave's. */
1592         if (is_zero_ether_addr(bond->dev->dev_addr))
1593                 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1594                        slave_dev->addr_len);
1595
1596
1597         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1598         if (!new_slave) {
1599                 res = -ENOMEM;
1600                 goto err_undo_flags;
1601         }
1602
1603         /*
1604          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1605          * is set via sysfs or module option if desired.
1606          */
1607         new_slave->queue_id = 0;
1608
1609         /* Save slave's original mtu and then set it to match the bond */
1610         new_slave->original_mtu = slave_dev->mtu;
1611         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1612         if (res) {
1613                 pr_debug("Error %d calling dev_set_mtu\n", res);
1614                 goto err_free;
1615         }
1616
1617         /*
1618          * Save slave's original ("permanent") mac address for modes
1619          * that need it, and for restoring it upon release, and then
1620          * set it to the master's address
1621          */
1622         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1623
1624         if (!bond->params.fail_over_mac) {
1625                 /*
1626                  * Set slave to master's mac address.  The application already
1627                  * set the master's mac address to that of the first slave
1628                  */
1629                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1630                 addr.sa_family = slave_dev->type;
1631                 res = dev_set_mac_address(slave_dev, &addr);
1632                 if (res) {
1633                         pr_debug("Error %d calling set_mac_address\n", res);
1634                         goto err_restore_mtu;
1635                 }
1636         }
1637
1638         res = netdev_set_bond_master(slave_dev, bond_dev);
1639         if (res) {
1640                 pr_debug("Error %d calling netdev_set_bond_master\n", res);
1641                 goto err_restore_mac;
1642         }
1643
1644         /* open the slave since the application closed it */
1645         res = dev_open(slave_dev);
1646         if (res) {
1647                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1648                 goto err_unset_master;
1649         }
1650
1651         new_slave->bond = bond;
1652         new_slave->dev = slave_dev;
1653         slave_dev->priv_flags |= IFF_BONDING;
1654
1655         if (bond_is_lb(bond)) {
1656                 /* bond_alb_init_slave() must be called before all other stages since
1657                  * it might fail and we do not want to have to undo everything
1658                  */
1659                 res = bond_alb_init_slave(bond, new_slave);
1660                 if (res)
1661                         goto err_close;
1662         }
1663
1664         /* If the mode USES_PRIMARY, then the new slave gets the
1665          * master's promisc (and mc) settings only if it becomes the
1666          * curr_active_slave, and that is taken care of later when calling
1667          * bond_change_active()
1668          */
1669         if (!USES_PRIMARY(bond->params.mode)) {
1670                 /* set promiscuity level to new slave */
1671                 if (bond_dev->flags & IFF_PROMISC) {
1672                         res = dev_set_promiscuity(slave_dev, 1);
1673                         if (res)
1674                                 goto err_close;
1675                 }
1676
1677                 /* set allmulti level to new slave */
1678                 if (bond_dev->flags & IFF_ALLMULTI) {
1679                         res = dev_set_allmulti(slave_dev, 1);
1680                         if (res)
1681                                 goto err_close;
1682                 }
1683
1684                 netif_addr_lock_bh(bond_dev);
1685                 /* upload master's mc_list to new slave */
1686                 netdev_for_each_mc_addr(ha, bond_dev)
1687                         dev_mc_add(slave_dev, ha->addr);
1688                 netif_addr_unlock_bh(bond_dev);
1689         }
1690
1691         if (bond->params.mode == BOND_MODE_8023AD) {
1692                 /* add lacpdu mc addr to mc list */
1693                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1694
1695                 dev_mc_add(slave_dev, lacpdu_multicast);
1696         }
1697
1698         bond_add_vlans_on_slave(bond, slave_dev);
1699
1700         write_lock_bh(&bond->lock);
1701
1702         bond_attach_slave(bond, new_slave);
1703
1704         new_slave->delay = 0;
1705         new_slave->link_failure_count = 0;
1706
1707         write_unlock_bh(&bond->lock);
1708
1709         bond_compute_features(bond);
1710
1711         read_lock(&bond->lock);
1712
1713         new_slave->last_arp_rx = jiffies;
1714
1715         if (bond->params.miimon && !bond->params.use_carrier) {
1716                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1717
1718                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1719                         /*
1720                          * miimon is set but a bonded network driver
1721                          * does not support ETHTOOL/MII and
1722                          * arp_interval is not set.  Note: if
1723                          * use_carrier is enabled, we will never go
1724                          * here (because netif_carrier is always
1725                          * supported); thus, we don't need to change
1726                          * the messages for netif_carrier.
1727                          */
1728                         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",
1729                                bond_dev->name, slave_dev->name);
1730                 } else if (link_reporting == -1) {
1731                         /* unable get link status using mii/ethtool */
1732                         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",
1733                                    bond_dev->name, slave_dev->name);
1734                 }
1735         }
1736
1737         /* check for initial state */
1738         if (!bond->params.miimon ||
1739             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1740                 if (bond->params.updelay) {
1741                         pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1742                         new_slave->link  = BOND_LINK_BACK;
1743                         new_slave->delay = bond->params.updelay;
1744                 } else {
1745                         pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1746                         new_slave->link  = BOND_LINK_UP;
1747                 }
1748                 new_slave->jiffies = jiffies;
1749         } else {
1750                 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1751                 new_slave->link  = BOND_LINK_DOWN;
1752         }
1753
1754         bond_update_speed_duplex(new_slave);
1755
1756         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1757                 /* if there is a primary slave, remember it */
1758                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1759                         bond->primary_slave = new_slave;
1760                         bond->force_primary = true;
1761                 }
1762         }
1763
1764         write_lock_bh(&bond->curr_slave_lock);
1765
1766         switch (bond->params.mode) {
1767         case BOND_MODE_ACTIVEBACKUP:
1768                 bond_set_slave_inactive_flags(new_slave);
1769                 bond_select_active_slave(bond);
1770                 break;
1771         case BOND_MODE_8023AD:
1772                 /* in 802.3ad mode, the internal mechanism
1773                  * will activate the slaves in the selected
1774                  * aggregator
1775                  */
1776                 bond_set_slave_inactive_flags(new_slave);
1777                 /* if this is the first slave */
1778                 if (bond->slave_cnt == 1) {
1779                         SLAVE_AD_INFO(new_slave).id = 1;
1780                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1781                          * can be called only after the mac address of the bond is set
1782                          */
1783                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1784                 } else {
1785                         SLAVE_AD_INFO(new_slave).id =
1786                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1787                 }
1788
1789                 bond_3ad_bind_slave(new_slave);
1790                 break;
1791         case BOND_MODE_TLB:
1792         case BOND_MODE_ALB:
1793                 bond_set_active_slave(new_slave);
1794                 bond_set_slave_inactive_flags(new_slave);
1795                 bond_select_active_slave(bond);
1796                 break;
1797         default:
1798                 pr_debug("This slave is always active in trunk mode\n");
1799
1800                 /* always active in trunk mode */
1801                 bond_set_active_slave(new_slave);
1802
1803                 /* In trunking mode there is little meaning to curr_active_slave
1804                  * anyway (it holds no special properties of the bond device),
1805                  * so we can change it without calling change_active_interface()
1806                  */
1807                 if (!bond->curr_active_slave)
1808                         bond->curr_active_slave = new_slave;
1809
1810                 break;
1811         } /* switch(bond_mode) */
1812
1813         write_unlock_bh(&bond->curr_slave_lock);
1814
1815         bond_set_carrier(bond);
1816
1817 #ifdef CONFIG_NET_POLL_CONTROLLER
1818         slave_dev->npinfo = bond_netpoll_info(bond);
1819         if (slave_dev->npinfo) {
1820                 if (slave_enable_netpoll(new_slave)) {
1821                         read_unlock(&bond->lock);
1822                         pr_info("Error, %s: master_dev is using netpoll, "
1823                                  "but new slave device does not support netpoll.\n",
1824                                  bond_dev->name);
1825                         res = -EBUSY;
1826                         goto err_close;
1827                 }
1828         }
1829 #endif
1830
1831         read_unlock(&bond->lock);
1832
1833         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1834         if (res)
1835                 goto err_close;
1836
1837         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1838                                          new_slave);
1839         if (res) {
1840                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1841                 goto err_dest_symlinks;
1842         }
1843
1844         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1845                 bond_dev->name, slave_dev->name,
1846                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1847                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1848
1849         /* enslave is successful */
1850         return 0;
1851
1852 /* Undo stages on error */
1853 err_dest_symlinks:
1854         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1855
1856 err_close:
1857         dev_close(slave_dev);
1858
1859 err_unset_master:
1860         netdev_set_bond_master(slave_dev, NULL);
1861
1862 err_restore_mac:
1863         if (!bond->params.fail_over_mac) {
1864                 /* XXX TODO - fom follow mode needs to change master's
1865                  * MAC if this slave's MAC is in use by the bond, or at
1866                  * least print a warning.
1867                  */
1868                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1869                 addr.sa_family = slave_dev->type;
1870                 dev_set_mac_address(slave_dev, &addr);
1871         }
1872
1873 err_restore_mtu:
1874         dev_set_mtu(slave_dev, new_slave->original_mtu);
1875
1876 err_free:
1877         kfree(new_slave);
1878
1879 err_undo_flags:
1880         bond_compute_features(bond);
1881
1882         return res;
1883 }
1884
1885 /*
1886  * Try to release the slave device <slave> from the bond device <master>
1887  * It is legal to access curr_active_slave without a lock because all the function
1888  * is write-locked.
1889  *
1890  * The rules for slave state should be:
1891  *   for Active/Backup:
1892  *     Active stays on all backups go down
1893  *   for Bonded connections:
1894  *     The first up interface should be left on and all others downed.
1895  */
1896 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1897 {
1898         struct bonding *bond = netdev_priv(bond_dev);
1899         struct slave *slave, *oldcurrent;
1900         struct sockaddr addr;
1901         netdev_features_t old_features = bond_dev->features;
1902
1903         /* slave is not a slave or master is not master of this slave */
1904         if (!(slave_dev->flags & IFF_SLAVE) ||
1905             (slave_dev->master != bond_dev)) {
1906                 pr_err("%s: Error: cannot release %s.\n",
1907                        bond_dev->name, slave_dev->name);
1908                 return -EINVAL;
1909         }
1910
1911         block_netpoll_tx();
1912         netdev_bonding_change(bond_dev, NETDEV_RELEASE);
1913         write_lock_bh(&bond->lock);
1914
1915         slave = bond_get_slave_by_dev(bond, slave_dev);
1916         if (!slave) {
1917                 /* not a slave of this bond */
1918                 pr_info("%s: %s not enslaved\n",
1919                         bond_dev->name, slave_dev->name);
1920                 write_unlock_bh(&bond->lock);
1921                 unblock_netpoll_tx();
1922                 return -EINVAL;
1923         }
1924
1925         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1926          * for this slave anymore.
1927          */
1928         netdev_rx_handler_unregister(slave_dev);
1929         write_unlock_bh(&bond->lock);
1930         synchronize_net();
1931         write_lock_bh(&bond->lock);
1932
1933         if (!bond->params.fail_over_mac) {
1934                 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1935                     bond->slave_cnt > 1)
1936                         pr_warning("%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",
1937                                    bond_dev->name, slave_dev->name,
1938                                    slave->perm_hwaddr,
1939                                    bond_dev->name, slave_dev->name);
1940         }
1941
1942         /* Inform AD package of unbinding of slave. */
1943         if (bond->params.mode == BOND_MODE_8023AD) {
1944                 /* must be called before the slave is
1945                  * detached from the list
1946                  */
1947                 bond_3ad_unbind_slave(slave);
1948         }
1949
1950         pr_info("%s: releasing %s interface %s\n",
1951                 bond_dev->name,
1952                 bond_is_active_slave(slave) ? "active" : "backup",
1953                 slave_dev->name);
1954
1955         oldcurrent = bond->curr_active_slave;
1956
1957         bond->current_arp_slave = NULL;
1958
1959         /* release the slave from its bond */
1960         bond_detach_slave(bond, slave);
1961
1962         if (bond->primary_slave == slave)
1963                 bond->primary_slave = NULL;
1964
1965         if (oldcurrent == slave)
1966                 bond_change_active_slave(bond, NULL);
1967
1968         if (bond_is_lb(bond)) {
1969                 /* Must be called only after the slave has been
1970                  * detached from the list and the curr_active_slave
1971                  * has been cleared (if our_slave == old_current),
1972                  * but before a new active slave is selected.
1973                  */
1974                 write_unlock_bh(&bond->lock);
1975                 bond_alb_deinit_slave(bond, slave);
1976                 write_lock_bh(&bond->lock);
1977         }
1978
1979         if (oldcurrent == slave) {
1980                 /*
1981                  * Note that we hold RTNL over this sequence, so there
1982                  * is no concern that another slave add/remove event
1983                  * will interfere.
1984                  */
1985                 write_unlock_bh(&bond->lock);
1986                 read_lock(&bond->lock);
1987                 write_lock_bh(&bond->curr_slave_lock);
1988
1989                 bond_select_active_slave(bond);
1990
1991                 write_unlock_bh(&bond->curr_slave_lock);
1992                 read_unlock(&bond->lock);
1993                 write_lock_bh(&bond->lock);
1994         }
1995
1996         if (bond->slave_cnt == 0) {
1997                 bond_set_carrier(bond);
1998
1999                 /* if the last slave was removed, zero the mac address
2000                  * of the master so it will be set by the application
2001                  * to the mac address of the first slave
2002                  */
2003                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2004
2005                 if (bond_vlan_used(bond)) {
2006                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2007                                    bond_dev->name, bond_dev->name);
2008                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2009                                    bond_dev->name);
2010                 }
2011         }
2012
2013         write_unlock_bh(&bond->lock);
2014         unblock_netpoll_tx();
2015
2016         bond_compute_features(bond);
2017         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2018             (old_features & NETIF_F_VLAN_CHALLENGED))
2019                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2020                         bond_dev->name, slave_dev->name, bond_dev->name);
2021
2022         /* must do this from outside any spinlocks */
2023         bond_destroy_slave_symlinks(bond_dev, slave_dev);
2024
2025         bond_del_vlans_from_slave(bond, slave_dev);
2026
2027         /* If the mode USES_PRIMARY, then we should only remove its
2028          * promisc and mc settings if it was the curr_active_slave, but that was
2029          * already taken care of above when we detached the slave
2030          */
2031         if (!USES_PRIMARY(bond->params.mode)) {
2032                 /* unset promiscuity level from slave */
2033                 if (bond_dev->flags & IFF_PROMISC)
2034                         dev_set_promiscuity(slave_dev, -1);
2035
2036                 /* unset allmulti level from slave */
2037                 if (bond_dev->flags & IFF_ALLMULTI)
2038                         dev_set_allmulti(slave_dev, -1);
2039
2040                 /* flush master's mc_list from slave */
2041                 netif_addr_lock_bh(bond_dev);
2042                 bond_mc_list_flush(bond_dev, slave_dev);
2043                 netif_addr_unlock_bh(bond_dev);
2044         }
2045
2046         netdev_set_bond_master(slave_dev, NULL);
2047
2048         slave_disable_netpoll(slave);
2049
2050         /* close slave before restoring its mac address */
2051         dev_close(slave_dev);
2052
2053         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2054                 /* restore original ("permanent") mac address */
2055                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2056                 addr.sa_family = slave_dev->type;
2057                 dev_set_mac_address(slave_dev, &addr);
2058         }
2059
2060         dev_set_mtu(slave_dev, slave->original_mtu);
2061
2062         slave_dev->priv_flags &= ~IFF_BONDING;
2063
2064         kfree(slave);
2065
2066         return 0;  /* deletion OK */
2067 }
2068
2069 /*
2070 * First release a slave and then destroy the bond if no more slaves are left.
2071 * Must be under rtnl_lock when this function is called.
2072 */
2073 static int  bond_release_and_destroy(struct net_device *bond_dev,
2074                                      struct net_device *slave_dev)
2075 {
2076         struct bonding *bond = netdev_priv(bond_dev);
2077         int ret;
2078
2079         ret = bond_release(bond_dev, slave_dev);
2080         if ((ret == 0) && (bond->slave_cnt == 0)) {
2081                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2082                 pr_info("%s: destroying bond %s.\n",
2083                         bond_dev->name, bond_dev->name);
2084                 unregister_netdevice(bond_dev);
2085         }
2086         return ret;
2087 }
2088
2089 /*
2090  * This function releases all slaves.
2091  */
2092 static int bond_release_all(struct net_device *bond_dev)
2093 {
2094         struct bonding *bond = netdev_priv(bond_dev);
2095         struct slave *slave;
2096         struct net_device *slave_dev;
2097         struct sockaddr addr;
2098
2099         write_lock_bh(&bond->lock);
2100
2101         netif_carrier_off(bond_dev);
2102
2103         if (bond->slave_cnt == 0)
2104                 goto out;
2105
2106         bond->current_arp_slave = NULL;
2107         bond->primary_slave = NULL;
2108         bond_change_active_slave(bond, NULL);
2109
2110         while ((slave = bond->first_slave) != NULL) {
2111                 /* Inform AD package of unbinding of slave
2112                  * before slave is detached from the list.
2113                  */
2114                 if (bond->params.mode == BOND_MODE_8023AD)
2115                         bond_3ad_unbind_slave(slave);
2116
2117                 slave_dev = slave->dev;
2118                 bond_detach_slave(bond, slave);
2119
2120                 /* now that the slave is detached, unlock and perform
2121                  * all the undo steps that should not be called from
2122                  * within a lock.
2123                  */
2124                 write_unlock_bh(&bond->lock);
2125
2126                 /* unregister rx_handler early so bond_handle_frame wouldn't
2127                  * be called for this slave anymore.
2128                  */
2129                 netdev_rx_handler_unregister(slave_dev);
2130                 synchronize_net();
2131
2132                 if (bond_is_lb(bond)) {
2133                         /* must be called only after the slave
2134                          * has been detached from the list
2135                          */
2136                         bond_alb_deinit_slave(bond, slave);
2137                 }
2138
2139                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2140                 bond_del_vlans_from_slave(bond, slave_dev);
2141
2142                 /* If the mode USES_PRIMARY, then we should only remove its
2143                  * promisc and mc settings if it was the curr_active_slave, but that was
2144                  * already taken care of above when we detached the slave
2145                  */
2146                 if (!USES_PRIMARY(bond->params.mode)) {
2147                         /* unset promiscuity level from slave */
2148                         if (bond_dev->flags & IFF_PROMISC)
2149                                 dev_set_promiscuity(slave_dev, -1);
2150
2151                         /* unset allmulti level from slave */
2152                         if (bond_dev->flags & IFF_ALLMULTI)
2153                                 dev_set_allmulti(slave_dev, -1);
2154
2155                         /* flush master's mc_list from slave */
2156                         netif_addr_lock_bh(bond_dev);
2157                         bond_mc_list_flush(bond_dev, slave_dev);
2158                         netif_addr_unlock_bh(bond_dev);
2159                 }
2160
2161                 netdev_set_bond_master(slave_dev, NULL);
2162
2163                 slave_disable_netpoll(slave);
2164
2165                 /* close slave before restoring its mac address */
2166                 dev_close(slave_dev);
2167
2168                 if (!bond->params.fail_over_mac) {
2169                         /* restore original ("permanent") mac address*/
2170                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2171                         addr.sa_family = slave_dev->type;
2172                         dev_set_mac_address(slave_dev, &addr);
2173                 }
2174
2175                 kfree(slave);
2176
2177                 /* re-acquire the lock before getting the next slave */
2178                 write_lock_bh(&bond->lock);
2179         }
2180
2181         /* zero the mac address of the master so it will be
2182          * set by the application to the mac address of the
2183          * first slave
2184          */
2185         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2186
2187         if (bond_vlan_used(bond)) {
2188                 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2189                            bond_dev->name, bond_dev->name);
2190                 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2191                            bond_dev->name);
2192         }
2193
2194         pr_info("%s: released all slaves\n", bond_dev->name);
2195
2196 out:
2197         write_unlock_bh(&bond->lock);
2198
2199         bond_compute_features(bond);
2200
2201         return 0;
2202 }
2203
2204 /*
2205  * This function changes the active slave to slave <slave_dev>.
2206  * It returns -EINVAL in the following cases.
2207  *  - <slave_dev> is not found in the list.
2208  *  - There is not active slave now.
2209  *  - <slave_dev> is already active.
2210  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2211  *  - <slave_dev> is not running.
2212  * In these cases, this function does nothing.
2213  * In the other cases, current_slave pointer is changed and 0 is returned.
2214  */
2215 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2216 {
2217         struct bonding *bond = netdev_priv(bond_dev);
2218         struct slave *old_active = NULL;
2219         struct slave *new_active = NULL;
2220         int res = 0;
2221
2222         if (!USES_PRIMARY(bond->params.mode))
2223                 return -EINVAL;
2224
2225         /* Verify that master_dev is indeed the master of slave_dev */
2226         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2227                 return -EINVAL;
2228
2229         read_lock(&bond->lock);
2230
2231         read_lock(&bond->curr_slave_lock);
2232         old_active = bond->curr_active_slave;
2233         read_unlock(&bond->curr_slave_lock);
2234
2235         new_active = bond_get_slave_by_dev(bond, slave_dev);
2236
2237         /*
2238          * Changing to the current active: do nothing; return success.
2239          */
2240         if (new_active && (new_active == old_active)) {
2241                 read_unlock(&bond->lock);
2242                 return 0;
2243         }
2244
2245         if ((new_active) &&
2246             (old_active) &&
2247             (new_active->link == BOND_LINK_UP) &&
2248             IS_UP(new_active->dev)) {
2249                 block_netpoll_tx();
2250                 write_lock_bh(&bond->curr_slave_lock);
2251                 bond_change_active_slave(bond, new_active);
2252                 write_unlock_bh(&bond->curr_slave_lock);
2253                 unblock_netpoll_tx();
2254         } else
2255                 res = -EINVAL;
2256
2257         read_unlock(&bond->lock);
2258
2259         return res;
2260 }
2261
2262 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2263 {
2264         struct bonding *bond = netdev_priv(bond_dev);
2265
2266         info->bond_mode = bond->params.mode;
2267         info->miimon = bond->params.miimon;
2268
2269         read_lock(&bond->lock);
2270         info->num_slaves = bond->slave_cnt;
2271         read_unlock(&bond->lock);
2272
2273         return 0;
2274 }
2275
2276 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2277 {
2278         struct bonding *bond = netdev_priv(bond_dev);
2279         struct slave *slave;
2280         int i, res = -ENODEV;
2281
2282         read_lock(&bond->lock);
2283
2284         bond_for_each_slave(bond, slave, i) {
2285                 if (i == (int)info->slave_id) {
2286                         res = 0;
2287                         strcpy(info->slave_name, slave->dev->name);
2288                         info->link = slave->link;
2289                         info->state = bond_slave_state(slave);
2290                         info->link_failure_count = slave->link_failure_count;
2291                         break;
2292                 }
2293         }
2294
2295         read_unlock(&bond->lock);
2296
2297         return res;
2298 }
2299
2300 /*-------------------------------- Monitoring -------------------------------*/
2301
2302
2303 static int bond_miimon_inspect(struct bonding *bond)
2304 {
2305         struct slave *slave;
2306         int i, link_state, commit = 0;
2307         bool ignore_updelay;
2308
2309         ignore_updelay = !bond->curr_active_slave ? true : false;
2310
2311         bond_for_each_slave(bond, slave, i) {
2312                 slave->new_link = BOND_LINK_NOCHANGE;
2313
2314                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2315
2316                 switch (slave->link) {
2317                 case BOND_LINK_UP:
2318                         if (link_state)
2319                                 continue;
2320
2321                         slave->link = BOND_LINK_FAIL;
2322                         slave->delay = bond->params.downdelay;
2323                         if (slave->delay) {
2324                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2325                                         bond->dev->name,
2326                                         (bond->params.mode ==
2327                                          BOND_MODE_ACTIVEBACKUP) ?
2328                                         (bond_is_active_slave(slave) ?
2329                                          "active " : "backup ") : "",
2330                                         slave->dev->name,
2331                                         bond->params.downdelay * bond->params.miimon);
2332                         }
2333                         /*FALLTHRU*/
2334                 case BOND_LINK_FAIL:
2335                         if (link_state) {
2336                                 /*
2337                                  * recovered before downdelay expired
2338                                  */
2339                                 slave->link = BOND_LINK_UP;
2340                                 slave->jiffies = jiffies;
2341                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2342                                         bond->dev->name,
2343                                         (bond->params.downdelay - slave->delay) *
2344                                         bond->params.miimon,
2345                                         slave->dev->name);
2346                                 continue;
2347                         }
2348
2349                         if (slave->delay <= 0) {
2350                                 slave->new_link = BOND_LINK_DOWN;
2351                                 commit++;
2352                                 continue;
2353                         }
2354
2355                         slave->delay--;
2356                         break;
2357
2358                 case BOND_LINK_DOWN:
2359                         if (!link_state)
2360                                 continue;
2361
2362                         slave->link = BOND_LINK_BACK;
2363                         slave->delay = bond->params.updelay;
2364
2365                         if (slave->delay) {
2366                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2367                                         bond->dev->name, slave->dev->name,
2368                                         ignore_updelay ? 0 :
2369                                         bond->params.updelay *
2370                                         bond->params.miimon);
2371                         }
2372                         /*FALLTHRU*/
2373                 case BOND_LINK_BACK:
2374                         if (!link_state) {
2375                                 slave->link = BOND_LINK_DOWN;
2376                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2377                                         bond->dev->name,
2378                                         (bond->params.updelay - slave->delay) *
2379                                         bond->params.miimon,
2380                                         slave->dev->name);
2381
2382                                 continue;
2383                         }
2384
2385                         if (ignore_updelay)
2386                                 slave->delay = 0;
2387
2388                         if (slave->delay <= 0) {
2389                                 slave->new_link = BOND_LINK_UP;
2390                                 commit++;
2391                                 ignore_updelay = false;
2392                                 continue;
2393                         }
2394
2395                         slave->delay--;
2396                         break;
2397                 }
2398         }
2399
2400         return commit;
2401 }
2402
2403 static void bond_miimon_commit(struct bonding *bond)
2404 {
2405         struct slave *slave;
2406         int i;
2407
2408         bond_for_each_slave(bond, slave, i) {
2409                 switch (slave->new_link) {
2410                 case BOND_LINK_NOCHANGE:
2411                         continue;
2412
2413                 case BOND_LINK_UP:
2414                         slave->link = BOND_LINK_UP;
2415                         slave->jiffies = jiffies;
2416
2417                         if (bond->params.mode == BOND_MODE_8023AD) {
2418                                 /* prevent it from being the active one */
2419                                 bond_set_backup_slave(slave);
2420                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2421                                 /* make it immediately active */
2422                                 bond_set_active_slave(slave);
2423                         } else if (slave != bond->primary_slave) {
2424                                 /* prevent it from being the active one */
2425                                 bond_set_backup_slave(slave);
2426                         }
2427
2428                         bond_update_speed_duplex(slave);
2429
2430                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2431                                 bond->dev->name, slave->dev->name,
2432                                 slave->speed, slave->duplex ? "full" : "half");
2433
2434                         /* notify ad that the link status has changed */
2435                         if (bond->params.mode == BOND_MODE_8023AD)
2436                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2437
2438                         if (bond_is_lb(bond))
2439                                 bond_alb_handle_link_change(bond, slave,
2440                                                             BOND_LINK_UP);
2441
2442                         if (!bond->curr_active_slave ||
2443                             (slave == bond->primary_slave))
2444                                 goto do_failover;
2445
2446                         continue;
2447
2448                 case BOND_LINK_DOWN:
2449                         if (slave->link_failure_count < UINT_MAX)
2450                                 slave->link_failure_count++;
2451
2452                         slave->link = BOND_LINK_DOWN;
2453
2454                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2455                             bond->params.mode == BOND_MODE_8023AD)
2456                                 bond_set_slave_inactive_flags(slave);
2457
2458                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2459                                 bond->dev->name, slave->dev->name);
2460
2461                         if (bond->params.mode == BOND_MODE_8023AD)
2462                                 bond_3ad_handle_link_change(slave,
2463                                                             BOND_LINK_DOWN);
2464
2465                         if (bond_is_lb(bond))
2466                                 bond_alb_handle_link_change(bond, slave,
2467                                                             BOND_LINK_DOWN);
2468
2469                         if (slave == bond->curr_active_slave)
2470                                 goto do_failover;
2471
2472                         continue;
2473
2474                 default:
2475                         pr_err("%s: invalid new link %d on slave %s\n",
2476                                bond->dev->name, slave->new_link,
2477                                slave->dev->name);
2478                         slave->new_link = BOND_LINK_NOCHANGE;
2479
2480                         continue;
2481                 }
2482
2483 do_failover:
2484                 ASSERT_RTNL();
2485                 block_netpoll_tx();
2486                 write_lock_bh(&bond->curr_slave_lock);
2487                 bond_select_active_slave(bond);
2488                 write_unlock_bh(&bond->curr_slave_lock);
2489                 unblock_netpoll_tx();
2490         }
2491
2492         bond_set_carrier(bond);
2493 }
2494
2495 /*
2496  * bond_mii_monitor
2497  *
2498  * Really a wrapper that splits the mii monitor into two phases: an
2499  * inspection, then (if inspection indicates something needs to be done)
2500  * an acquisition of appropriate locks followed by a commit phase to
2501  * implement whatever link state changes are indicated.
2502  */
2503 void bond_mii_monitor(struct work_struct *work)
2504 {
2505         struct bonding *bond = container_of(work, struct bonding,
2506                                             mii_work.work);
2507         bool should_notify_peers = false;
2508         unsigned long delay;
2509
2510         read_lock(&bond->lock);
2511
2512         delay = msecs_to_jiffies(bond->params.miimon);
2513
2514         if (bond->slave_cnt == 0)
2515                 goto re_arm;
2516
2517         should_notify_peers = bond_should_notify_peers(bond);
2518
2519         if (bond_miimon_inspect(bond)) {
2520                 read_unlock(&bond->lock);
2521
2522                 /* Race avoidance with bond_close cancel of workqueue */
2523                 if (!rtnl_trylock()) {
2524                         read_lock(&bond->lock);
2525                         delay = 1;
2526                         should_notify_peers = false;
2527                         goto re_arm;
2528                 }
2529
2530                 read_lock(&bond->lock);
2531
2532                 bond_miimon_commit(bond);
2533
2534                 read_unlock(&bond->lock);
2535                 rtnl_unlock();  /* might sleep, hold no other locks */
2536                 read_lock(&bond->lock);
2537         }
2538
2539 re_arm:
2540         if (bond->params.miimon)
2541                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2542
2543         read_unlock(&bond->lock);
2544
2545         if (should_notify_peers) {
2546                 if (!rtnl_trylock()) {
2547                         read_lock(&bond->lock);
2548                         bond->send_peer_notif++;
2549                         read_unlock(&bond->lock);
2550                         return;
2551                 }
2552                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
2553                 rtnl_unlock();
2554         }
2555 }
2556
2557 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2558 {
2559         struct vlan_entry *vlan;
2560
2561         if (ip == bond->master_ip)
2562                 return 1;
2563
2564         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2565                 if (ip == vlan->vlan_ip)
2566                         return 1;
2567         }
2568
2569         return 0;
2570 }
2571
2572 /*
2573  * We go to the (large) trouble of VLAN tagging ARP frames because
2574  * switches in VLAN mode (especially if ports are configured as
2575  * "native" to a VLAN) might not pass non-tagged frames.
2576  */
2577 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2578 {
2579         struct sk_buff *skb;
2580
2581         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2582                  slave_dev->name, dest_ip, src_ip, vlan_id);
2583
2584         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2585                          NULL, slave_dev->dev_addr, NULL);
2586
2587         if (!skb) {
2588                 pr_err("ARP packet allocation failed\n");
2589                 return;
2590         }
2591         if (vlan_id) {
2592                 skb = vlan_put_tag(skb, vlan_id);
2593                 if (!skb) {
2594                         pr_err("failed to insert VLAN tag\n");
2595                         return;
2596                 }
2597         }
2598         arp_xmit(skb);
2599 }
2600
2601
2602 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2603 {
2604         int i, vlan_id;
2605         __be32 *targets = bond->params.arp_targets;
2606         struct vlan_entry *vlan;
2607         struct net_device *vlan_dev;
2608         struct rtable *rt;
2609
2610         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2611                 if (!targets[i])
2612                         break;
2613                 pr_debug("basa: target %x\n", targets[i]);
2614                 if (!bond_vlan_used(bond)) {
2615                         pr_debug("basa: empty vlan: arp_send\n");
2616                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2617                                       bond->master_ip, 0);
2618                         continue;
2619                 }
2620
2621                 /*
2622                  * If VLANs are configured, we do a route lookup to
2623                  * determine which VLAN interface would be used, so we
2624                  * can tag the ARP with the proper VLAN tag.
2625                  */
2626                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2627                                      RTO_ONLINK, 0);
2628                 if (IS_ERR(rt)) {
2629                         if (net_ratelimit()) {
2630                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2631                                            bond->dev->name, &targets[i]);
2632                         }
2633                         continue;
2634                 }
2635
2636                 /*
2637                  * This target is not on a VLAN
2638                  */
2639                 if (rt->dst.dev == bond->dev) {
2640                         ip_rt_put(rt);
2641                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2642                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2643                                       bond->master_ip, 0);
2644                         continue;
2645                 }
2646
2647                 vlan_id = 0;
2648                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2649                         rcu_read_lock();
2650                         vlan_dev = __vlan_find_dev_deep(bond->dev,
2651                                                         vlan->vlan_id);
2652                         rcu_read_unlock();
2653                         if (vlan_dev == rt->dst.dev) {
2654                                 vlan_id = vlan->vlan_id;
2655                                 pr_debug("basa: vlan match on %s %d\n",
2656                                        vlan_dev->name, vlan_id);
2657                                 break;
2658                         }
2659                 }
2660
2661                 if (vlan_id) {
2662                         ip_rt_put(rt);
2663                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2664                                       vlan->vlan_ip, vlan_id);
2665                         continue;
2666                 }
2667
2668                 if (net_ratelimit()) {
2669                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2670                                    bond->dev->name, &targets[i],
2671                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2672                 }
2673                 ip_rt_put(rt);
2674         }
2675 }
2676
2677 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2678 {
2679         int i;
2680         __be32 *targets = bond->params.arp_targets;
2681
2682         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2683                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2684                          &sip, &tip, i, &targets[i],
2685                          bond_has_this_ip(bond, tip));
2686                 if (sip == targets[i]) {
2687                         if (bond_has_this_ip(bond, tip))
2688                                 slave->last_arp_rx = jiffies;
2689                         return;
2690                 }
2691         }
2692 }
2693
2694 static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond,
2695                          struct slave *slave)
2696 {
2697         struct arphdr *arp;
2698         unsigned char *arp_ptr;
2699         __be32 sip, tip;
2700
2701         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2702                 return;
2703
2704         read_lock(&bond->lock);
2705
2706         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2707                  bond->dev->name, skb->dev->name);
2708
2709         if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
2710                 goto out_unlock;
2711
2712         arp = arp_hdr(skb);
2713         if (arp->ar_hln != bond->dev->addr_len ||
2714             skb->pkt_type == PACKET_OTHERHOST ||
2715             skb->pkt_type == PACKET_LOOPBACK ||
2716             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2717             arp->ar_pro != htons(ETH_P_IP) ||
2718             arp->ar_pln != 4)
2719                 goto out_unlock;
2720
2721         arp_ptr = (unsigned char *)(arp + 1);
2722         arp_ptr += bond->dev->addr_len;
2723         memcpy(&sip, arp_ptr, 4);
2724         arp_ptr += 4 + bond->dev->addr_len;
2725         memcpy(&tip, arp_ptr, 4);
2726
2727         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2728                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2729                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2730                  &sip, &tip);
2731
2732         /*
2733          * Backup slaves won't see the ARP reply, but do come through
2734          * here for each ARP probe (so we swap the sip/tip to validate
2735          * the probe).  In a "redundant switch, common router" type of
2736          * configuration, the ARP probe will (hopefully) travel from
2737          * the active, through one switch, the router, then the other
2738          * switch before reaching the backup.
2739          */
2740         if (bond_is_active_slave(slave))
2741                 bond_validate_arp(bond, slave, sip, tip);
2742         else
2743                 bond_validate_arp(bond, slave, tip, sip);
2744
2745 out_unlock:
2746         read_unlock(&bond->lock);
2747 }
2748
2749 /*
2750  * this function is called regularly to monitor each slave's link
2751  * ensuring that traffic is being sent and received when arp monitoring
2752  * is used in load-balancing mode. if the adapter has been dormant, then an
2753  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2754  * arp monitoring in active backup mode.
2755  */
2756 void bond_loadbalance_arp_mon(struct work_struct *work)
2757 {
2758         struct bonding *bond = container_of(work, struct bonding,
2759                                             arp_work.work);
2760         struct slave *slave, *oldcurrent;
2761         int do_failover = 0;
2762         int delta_in_ticks;
2763         int i;
2764
2765         read_lock(&bond->lock);
2766
2767         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2768
2769         if (bond->slave_cnt == 0)
2770                 goto re_arm;
2771
2772         read_lock(&bond->curr_slave_lock);
2773         oldcurrent = bond->curr_active_slave;
2774         read_unlock(&bond->curr_slave_lock);
2775
2776         /* see if any of the previous devices are up now (i.e. they have
2777          * xmt and rcv traffic). the curr_active_slave does not come into
2778          * the picture unless it is null. also, slave->jiffies is not needed
2779          * here because we send an arp on each slave and give a slave as
2780          * long as it needs to get the tx/rx within the delta.
2781          * TODO: what about up/down delay in arp mode? it wasn't here before
2782          *       so it can wait
2783          */
2784         bond_for_each_slave(bond, slave, i) {
2785                 unsigned long trans_start = dev_trans_start(slave->dev);
2786
2787                 if (slave->link != BOND_LINK_UP) {
2788                         if (time_in_range(jiffies,
2789                                 trans_start - delta_in_ticks,
2790                                 trans_start + delta_in_ticks) &&
2791                             time_in_range(jiffies,
2792                                 slave->dev->last_rx - delta_in_ticks,
2793                                 slave->dev->last_rx + delta_in_ticks)) {
2794
2795                                 slave->link  = BOND_LINK_UP;
2796                                 bond_set_active_slave(slave);
2797
2798                                 /* primary_slave has no meaning in round-robin
2799                                  * mode. the window of a slave being up and
2800                                  * curr_active_slave being null after enslaving
2801                                  * is closed.
2802                                  */
2803                                 if (!oldcurrent) {
2804                                         pr_info("%s: link status definitely up for interface %s, ",
2805                                                 bond->dev->name,
2806                                                 slave->dev->name);
2807                                         do_failover = 1;
2808                                 } else {
2809                                         pr_info("%s: interface %s is now up\n",
2810                                                 bond->dev->name,
2811                                                 slave->dev->name);
2812                                 }
2813                         }
2814                 } else {
2815                         /* slave->link == BOND_LINK_UP */
2816
2817                         /* not all switches will respond to an arp request
2818                          * when the source ip is 0, so don't take the link down
2819                          * if we don't know our ip yet
2820                          */
2821                         if (!time_in_range(jiffies,
2822                                 trans_start - delta_in_ticks,
2823                                 trans_start + 2 * delta_in_ticks) ||
2824                             !time_in_range(jiffies,
2825                                 slave->dev->last_rx - delta_in_ticks,
2826                                 slave->dev->last_rx + 2 * delta_in_ticks)) {
2827
2828                                 slave->link  = BOND_LINK_DOWN;
2829                                 bond_set_backup_slave(slave);
2830
2831                                 if (slave->link_failure_count < UINT_MAX)
2832                                         slave->link_failure_count++;
2833
2834                                 pr_info("%s: interface %s is now down.\n",
2835                                         bond->dev->name,
2836                                         slave->dev->name);
2837
2838                                 if (slave == oldcurrent)
2839                                         do_failover = 1;
2840                         }
2841                 }
2842
2843                 /* note: if switch is in round-robin mode, all links
2844                  * must tx arp to ensure all links rx an arp - otherwise
2845                  * links may oscillate or not come up at all; if switch is
2846                  * in something like xor mode, there is nothing we can
2847                  * do - all replies will be rx'ed on same link causing slaves
2848                  * to be unstable during low/no traffic periods
2849                  */
2850                 if (IS_UP(slave->dev))
2851                         bond_arp_send_all(bond, slave);
2852         }
2853
2854         if (do_failover) {
2855                 block_netpoll_tx();
2856                 write_lock_bh(&bond->curr_slave_lock);
2857
2858                 bond_select_active_slave(bond);
2859
2860                 write_unlock_bh(&bond->curr_slave_lock);
2861                 unblock_netpoll_tx();
2862         }
2863
2864 re_arm:
2865         if (bond->params.arp_interval)
2866                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2867
2868         read_unlock(&bond->lock);
2869 }
2870
2871 /*
2872  * Called to inspect slaves for active-backup mode ARP monitor link state
2873  * changes.  Sets new_link in slaves to specify what action should take
2874  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2875  * to link states must be committed.
2876  *
2877  * Called with bond->lock held for read.
2878  */
2879 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2880 {
2881         struct slave *slave;
2882         int i, commit = 0;
2883         unsigned long trans_start;
2884
2885         bond_for_each_slave(bond, slave, i) {
2886                 slave->new_link = BOND_LINK_NOCHANGE;
2887
2888                 if (slave->link != BOND_LINK_UP) {
2889                         if (time_in_range(jiffies,
2890                                 slave_last_rx(bond, slave) - delta_in_ticks,
2891                                 slave_last_rx(bond, slave) + delta_in_ticks)) {
2892
2893                                 slave->new_link = BOND_LINK_UP;
2894                                 commit++;
2895                         }
2896
2897                         continue;
2898                 }
2899
2900                 /*
2901                  * Give slaves 2*delta after being enslaved or made
2902                  * active.  This avoids bouncing, as the last receive
2903                  * times need a full ARP monitor cycle to be updated.
2904                  */
2905                 if (time_in_range(jiffies,
2906                                   slave->jiffies - delta_in_ticks,
2907                                   slave->jiffies + 2 * delta_in_ticks))
2908                         continue;
2909
2910                 /*
2911                  * Backup slave is down if:
2912                  * - No current_arp_slave AND
2913                  * - more than 3*delta since last receive AND
2914                  * - the bond has an IP address
2915                  *
2916                  * Note: a non-null current_arp_slave indicates
2917                  * the curr_active_slave went down and we are
2918                  * searching for a new one; under this condition
2919                  * we only take the curr_active_slave down - this
2920                  * gives each slave a chance to tx/rx traffic
2921                  * before being taken out
2922                  */
2923                 if (!bond_is_active_slave(slave) &&
2924                     !bond->current_arp_slave &&
2925                     !time_in_range(jiffies,
2926                         slave_last_rx(bond, slave) - delta_in_ticks,
2927                         slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2928
2929                         slave->new_link = BOND_LINK_DOWN;
2930                         commit++;
2931                 }
2932
2933                 /*
2934                  * Active slave is down if:
2935                  * - more than 2*delta since transmitting OR
2936                  * - (more than 2*delta since receive AND
2937                  *    the bond has an IP address)
2938                  */
2939                 trans_start = dev_trans_start(slave->dev);
2940                 if (bond_is_active_slave(slave) &&
2941                     (!time_in_range(jiffies,
2942                         trans_start - delta_in_ticks,
2943                         trans_start + 2 * delta_in_ticks) ||
2944                      !time_in_range(jiffies,
2945                         slave_last_rx(bond, slave) - delta_in_ticks,
2946                         slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
2947
2948                         slave->new_link = BOND_LINK_DOWN;
2949                         commit++;
2950                 }
2951         }
2952
2953         return commit;
2954 }
2955
2956 /*
2957  * Called to commit link state changes noted by inspection step of
2958  * active-backup mode ARP monitor.
2959  *
2960  * Called with RTNL and bond->lock for read.
2961  */
2962 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2963 {
2964         struct slave *slave;
2965         int i;
2966         unsigned long trans_start;
2967
2968         bond_for_each_slave(bond, slave, i) {
2969                 switch (slave->new_link) {
2970                 case BOND_LINK_NOCHANGE:
2971                         continue;
2972
2973                 case BOND_LINK_UP:
2974                         trans_start = dev_trans_start(slave->dev);
2975                         if ((!bond->curr_active_slave &&
2976                              time_in_range(jiffies,
2977                                            trans_start - delta_in_ticks,
2978                                            trans_start + delta_in_ticks)) ||
2979                             bond->curr_active_slave != slave) {
2980                                 slave->link = BOND_LINK_UP;
2981                                 bond->current_arp_slave = NULL;
2982
2983                                 pr_info("%s: link status definitely up for interface %s.\n",
2984                                         bond->dev->name, slave->dev->name);
2985
2986                                 if (!bond->curr_active_slave ||
2987                                     (slave == bond->primary_slave))
2988                                         goto do_failover;
2989
2990                         }
2991
2992                         continue;
2993
2994                 case BOND_LINK_DOWN:
2995                         if (slave->link_failure_count < UINT_MAX)
2996                                 slave->link_failure_count++;
2997
2998                         slave->link = BOND_LINK_DOWN;
2999                         bond_set_slave_inactive_flags(slave);
3000
3001                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
3002                                 bond->dev->name, slave->dev->name);
3003
3004                         if (slave == bond->curr_active_slave) {
3005                                 bond->current_arp_slave = NULL;
3006                                 goto do_failover;
3007                         }
3008
3009                         continue;
3010
3011                 default:
3012                         pr_err("%s: impossible: new_link %d on slave %s\n",
3013                                bond->dev->name, slave->new_link,
3014                                slave->dev->name);
3015                         continue;
3016                 }
3017
3018 do_failover:
3019                 ASSERT_RTNL();
3020                 block_netpoll_tx();
3021                 write_lock_bh(&bond->curr_slave_lock);
3022                 bond_select_active_slave(bond);
3023                 write_unlock_bh(&bond->curr_slave_lock);
3024                 unblock_netpoll_tx();
3025         }
3026
3027         bond_set_carrier(bond);
3028 }
3029
3030 /*
3031  * Send ARP probes for active-backup mode ARP monitor.
3032  *
3033  * Called with bond->lock held for read.
3034  */
3035 static void bond_ab_arp_probe(struct bonding *bond)
3036 {
3037         struct slave *slave;
3038         int i;
3039
3040         read_lock(&bond->curr_slave_lock);
3041
3042         if (bond->current_arp_slave && bond->curr_active_slave)
3043                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3044                         bond->current_arp_slave->dev->name,
3045                         bond->curr_active_slave->dev->name);
3046
3047         if (bond->curr_active_slave) {
3048                 bond_arp_send_all(bond, bond->curr_active_slave);
3049                 read_unlock(&bond->curr_slave_lock);
3050                 return;
3051         }
3052
3053         read_unlock(&bond->curr_slave_lock);
3054
3055         /* if we don't have a curr_active_slave, search for the next available
3056          * backup slave from the current_arp_slave and make it the candidate
3057          * for becoming the curr_active_slave
3058          */
3059
3060         if (!bond->current_arp_slave) {
3061                 bond->current_arp_slave = bond->first_slave;
3062                 if (!bond->current_arp_slave)
3063                         return;
3064         }
3065
3066         bond_set_slave_inactive_flags(bond->current_arp_slave);
3067
3068         /* search for next candidate */
3069         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3070                 if (IS_UP(slave->dev)) {
3071                         slave->link = BOND_LINK_BACK;
3072                         bond_set_slave_active_flags(slave);
3073                         bond_arp_send_all(bond, slave);
3074                         slave->jiffies = jiffies;
3075                         bond->current_arp_slave = slave;
3076                         break;
3077                 }
3078
3079                 /* if the link state is up at this point, we
3080                  * mark it down - this can happen if we have
3081                  * simultaneous link failures and
3082                  * reselect_active_interface doesn't make this
3083                  * one the current slave so it is still marked
3084                  * up when it is actually down
3085                  */
3086                 if (slave->link == BOND_LINK_UP) {
3087                         slave->link = BOND_LINK_DOWN;
3088                         if (slave->link_failure_count < UINT_MAX)
3089                                 slave->link_failure_count++;
3090
3091                         bond_set_slave_inactive_flags(slave);
3092
3093                         pr_info("%s: backup interface %s is now down.\n",
3094                                 bond->dev->name, slave->dev->name);
3095                 }
3096         }
3097 }
3098
3099 void bond_activebackup_arp_mon(struct work_struct *work)
3100 {
3101         struct bonding *bond = container_of(work, struct bonding,
3102                                             arp_work.work);
3103         bool should_notify_peers = false;
3104         int delta_in_ticks;
3105
3106         read_lock(&bond->lock);
3107
3108         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3109
3110         if (bond->slave_cnt == 0)
3111                 goto re_arm;
3112
3113         should_notify_peers = bond_should_notify_peers(bond);
3114
3115         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3116                 read_unlock(&bond->lock);
3117
3118                 /* Race avoidance with bond_close flush of workqueue */
3119                 if (!rtnl_trylock()) {
3120                         read_lock(&bond->lock);
3121                         delta_in_ticks = 1;
3122                         should_notify_peers = false;
3123                         goto re_arm;
3124                 }
3125
3126                 read_lock(&bond->lock);
3127
3128                 bond_ab_arp_commit(bond, delta_in_ticks);
3129
3130                 read_unlock(&bond->lock);
3131                 rtnl_unlock();
3132                 read_lock(&bond->lock);
3133         }
3134
3135         bond_ab_arp_probe(bond);
3136
3137 re_arm:
3138         if (bond->params.arp_interval)
3139                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3140
3141         read_unlock(&bond->lock);
3142
3143         if (should_notify_peers) {
3144                 if (!rtnl_trylock()) {
3145                         read_lock(&bond->lock);
3146                         bond->send_peer_notif++;
3147                         read_unlock(&bond->lock);
3148                         return;
3149                 }
3150                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
3151                 rtnl_unlock();
3152         }
3153 }
3154
3155 /*-------------------------- netdev event handling --------------------------*/
3156
3157 /*
3158  * Change device name
3159  */
3160 static int bond_event_changename(struct bonding *bond)
3161 {
3162         bond_remove_proc_entry(bond);
3163         bond_create_proc_entry(bond);
3164
3165         bond_debug_reregister(bond);
3166
3167         return NOTIFY_DONE;
3168 }
3169
3170 static int bond_master_netdev_event(unsigned long event,
3171                                     struct net_device *bond_dev)
3172 {
3173         struct bonding *event_bond = netdev_priv(bond_dev);
3174
3175         switch (event) {
3176         case NETDEV_CHANGENAME:
3177                 return bond_event_changename(event_bond);
3178         default:
3179                 break;
3180         }
3181
3182         return NOTIFY_DONE;
3183 }
3184
3185 static int bond_slave_netdev_event(unsigned long event,
3186                                    struct net_device *slave_dev)
3187 {
3188         struct net_device *bond_dev = slave_dev->master;
3189         struct bonding *bond = netdev_priv(bond_dev);
3190         struct slave *slave = NULL;
3191
3192         switch (event) {
3193         case NETDEV_UNREGISTER:
3194                 if (bond_dev) {
3195                         if (bond->setup_by_slave)
3196                                 bond_release_and_destroy(bond_dev, slave_dev);
3197                         else
3198                                 bond_release(bond_dev, slave_dev);
3199                 }
3200                 break;
3201         case NETDEV_UP:
3202         case NETDEV_CHANGE:
3203                 slave = bond_get_slave_by_dev(bond, slave_dev);
3204                 if (slave) {
3205                         u32 old_speed = slave->speed;
3206                         u8  old_duplex = slave->duplex;
3207
3208                         bond_update_speed_duplex(slave);
3209
3210                         if (bond->params.mode == BOND_MODE_8023AD) {
3211                                 if (old_speed != slave->speed)
3212                                         bond_3ad_adapter_speed_changed(slave);
3213                                 if (old_duplex != slave->duplex)
3214                                         bond_3ad_adapter_duplex_changed(slave);
3215                         }
3216                 }
3217
3218                 break;
3219         case NETDEV_DOWN:
3220                 /*
3221                  * ... Or is it this?
3222                  */
3223                 break;
3224         case NETDEV_CHANGEMTU:
3225                 /*
3226                  * TODO: Should slaves be allowed to
3227                  * independently alter their MTU?  For
3228                  * an active-backup bond, slaves need
3229                  * not be the same type of device, so
3230                  * MTUs may vary.  For other modes,
3231                  * slaves arguably should have the
3232                  * same MTUs. To do this, we'd need to
3233                  * take over the slave's change_mtu
3234                  * function for the duration of their
3235                  * servitude.
3236                  */
3237                 break;
3238         case NETDEV_CHANGENAME:
3239                 /*
3240                  * TODO: handle changing the primary's name
3241                  */
3242                 break;
3243         case NETDEV_FEAT_CHANGE:
3244                 bond_compute_features(bond);
3245                 break;
3246         default:
3247                 break;
3248         }
3249
3250         return NOTIFY_DONE;
3251 }
3252
3253 /*
3254  * bond_netdev_event: handle netdev notifier chain events.
3255  *
3256  * This function receives events for the netdev chain.  The caller (an
3257  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3258  * locks for us to safely manipulate the slave devices (RTNL lock,
3259  * dev_probe_lock).
3260  */
3261 static int bond_netdev_event(struct notifier_block *this,
3262                              unsigned long event, void *ptr)
3263 {
3264         struct net_device *event_dev = (struct net_device *)ptr;
3265
3266         pr_debug("event_dev: %s, event: %lx\n",
3267                  event_dev ? event_dev->name : "None",
3268                  event);
3269
3270         if (!(event_dev->priv_flags & IFF_BONDING))
3271                 return NOTIFY_DONE;
3272
3273         if (event_dev->flags & IFF_MASTER) {
3274                 pr_debug("IFF_MASTER\n");
3275                 return bond_master_netdev_event(event, event_dev);
3276         }
3277
3278         if (event_dev->flags & IFF_SLAVE) {
3279                 pr_debug("IFF_SLAVE\n");
3280                 return bond_slave_netdev_event(event, event_dev);
3281         }
3282
3283         return NOTIFY_DONE;
3284 }
3285
3286 /*
3287  * bond_inetaddr_event: handle inetaddr notifier chain events.
3288  *
3289  * We keep track of device IPs primarily to use as source addresses in
3290  * ARP monitor probes (rather than spewing out broadcasts all the time).
3291  *
3292  * We track one IP for the main device (if it has one), plus one per VLAN.
3293  */
3294 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3295 {
3296         struct in_ifaddr *ifa = ptr;
3297         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3298         struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3299         struct bonding *bond;
3300         struct vlan_entry *vlan;
3301
3302         /* we only care about primary address */
3303         if(ifa->ifa_flags & IFA_F_SECONDARY)
3304                 return NOTIFY_DONE;
3305
3306         list_for_each_entry(bond, &bn->dev_list, bond_list) {
3307                 if (bond->dev == event_dev) {
3308                         switch (event) {
3309                         case NETDEV_UP:
3310                                 bond->master_ip = ifa->ifa_local;
3311                                 return NOTIFY_OK;
3312                         case NETDEV_DOWN:
3313                                 bond->master_ip = 0;
3314                                 return NOTIFY_OK;
3315                         default:
3316                                 return NOTIFY_DONE;
3317                         }
3318                 }
3319
3320                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3321                         vlan_dev = __vlan_find_dev_deep(bond->dev,
3322                                                         vlan->vlan_id);
3323                         if (vlan_dev == event_dev) {
3324                                 switch (event) {
3325                                 case NETDEV_UP:
3326                                         vlan->vlan_ip = ifa->ifa_local;
3327                                         return NOTIFY_OK;
3328                                 case NETDEV_DOWN:
3329                                         vlan->vlan_ip = 0;
3330                                         return NOTIFY_OK;
3331                                 default:
3332                                         return NOTIFY_DONE;
3333                                 }
3334                         }
3335                 }
3336         }
3337         return NOTIFY_DONE;
3338 }
3339
3340 static struct notifier_block bond_netdev_notifier = {
3341         .notifier_call = bond_netdev_event,
3342 };
3343
3344 static struct notifier_block bond_inetaddr_notifier = {
3345         .notifier_call = bond_inetaddr_event,
3346 };
3347
3348 /*---------------------------- Hashing Policies -----------------------------*/
3349
3350 /*
3351  * Hash for the output device based upon layer 2 and layer 3 data. If
3352  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3353  */
3354 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3355 {
3356         struct ethhdr *data = (struct ethhdr *)skb->data;
3357         struct iphdr *iph = ip_hdr(skb);
3358
3359         if (skb->protocol == htons(ETH_P_IP)) {
3360                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3361                         (data->h_dest[5] ^ data->h_source[5])) % count;
3362         }
3363
3364         return (data->h_dest[5] ^ data->h_source[5]) % count;
3365 }
3366
3367 /*
3368  * Hash for the output device based upon layer 3 and layer 4 data. If
3369  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3370  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3371  */
3372 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3373 {
3374         struct ethhdr *data = (struct ethhdr *)skb->data;
3375         struct iphdr *iph = ip_hdr(skb);
3376         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3377         int layer4_xor = 0;
3378
3379         if (skb->protocol == htons(ETH_P_IP)) {
3380                 if (!ip_is_fragment(iph) &&
3381                     (iph->protocol == IPPROTO_TCP ||
3382                      iph->protocol == IPPROTO_UDP)) {
3383                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3384                 }
3385                 return (layer4_xor ^
3386                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3387
3388         }
3389
3390         return (data->h_dest[5] ^ data->h_source[5]) % count;
3391 }
3392
3393 /*
3394  * Hash for the output device based upon layer 2 data
3395  */
3396 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3397 {
3398         struct ethhdr *data = (struct ethhdr *)skb->data;
3399
3400         return (data->h_dest[5] ^ data->h_source[5]) % count;
3401 }
3402
3403 /*-------------------------- Device entry points ----------------------------*/
3404
3405 static int bond_open(struct net_device *bond_dev)
3406 {
3407         struct bonding *bond = netdev_priv(bond_dev);
3408         struct slave *slave;
3409         int i;
3410
3411         /* reset slave->backup and slave->inactive */
3412         read_lock(&bond->lock);
3413         if (bond->slave_cnt > 0) {
3414                 read_lock(&bond->curr_slave_lock);
3415                 bond_for_each_slave(bond, slave, i) {
3416                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3417                                 && (slave != bond->curr_active_slave)) {
3418                                 bond_set_slave_inactive_flags(slave);
3419                         } else {
3420                                 bond_set_slave_active_flags(slave);
3421                         }
3422                 }
3423                 read_unlock(&bond->curr_slave_lock);
3424         }
3425         read_unlock(&bond->lock);
3426
3427         INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3428
3429         if (bond_is_lb(bond)) {
3430                 /* bond_alb_initialize must be called before the timer
3431                  * is started.
3432                  */
3433                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3434                         /* something went wrong - fail the open operation */
3435                         return -ENOMEM;
3436                 }
3437
3438                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3439                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3440         }
3441
3442         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3443                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3444                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3445         }
3446
3447         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3448                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3449                         INIT_DELAYED_WORK(&bond->arp_work,
3450                                           bond_activebackup_arp_mon);
3451                 else
3452                         INIT_DELAYED_WORK(&bond->arp_work,
3453                                           bond_loadbalance_arp_mon);
3454
3455                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3456                 if (bond->params.arp_validate)
3457                         bond->recv_probe = bond_arp_rcv;
3458         }
3459
3460         if (bond->params.mode == BOND_MODE_8023AD) {
3461                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3462                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3463                 /* register to receive LACPDUs */
3464                 bond->recv_probe = bond_3ad_lacpdu_recv;
3465                 bond_3ad_initiate_agg_selection(bond, 1);
3466         }
3467
3468         return 0;
3469 }
3470
3471 static int bond_close(struct net_device *bond_dev)
3472 {
3473         struct bonding *bond = netdev_priv(bond_dev);
3474
3475         write_lock_bh(&bond->lock);
3476
3477         bond->send_peer_notif = 0;
3478
3479         write_unlock_bh(&bond->lock);
3480
3481         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3482                 cancel_delayed_work_sync(&bond->mii_work);
3483         }
3484
3485         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3486                 cancel_delayed_work_sync(&bond->arp_work);
3487         }
3488
3489         switch (bond->params.mode) {
3490         case BOND_MODE_8023AD:
3491                 cancel_delayed_work_sync(&bond->ad_work);
3492                 break;
3493         case BOND_MODE_TLB:
3494         case BOND_MODE_ALB:
3495                 cancel_delayed_work_sync(&bond->alb_work);
3496                 break;
3497         default:
3498                 break;
3499         }
3500
3501         if (delayed_work_pending(&bond->mcast_work))
3502                 cancel_delayed_work_sync(&bond->mcast_work);
3503
3504         if (bond_is_lb(bond)) {
3505                 /* Must be called only after all
3506                  * slaves have been released
3507                  */
3508                 bond_alb_deinitialize(bond);
3509         }
3510         bond->recv_probe = NULL;
3511
3512         return 0;
3513 }
3514
3515 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3516                                                 struct rtnl_link_stats64 *stats)
3517 {
3518         struct bonding *bond = netdev_priv(bond_dev);
3519         struct rtnl_link_stats64 temp;
3520         struct slave *slave;
3521         int i;
3522
3523         memset(stats, 0, sizeof(*stats));
3524
3525         read_lock_bh(&bond->lock);
3526
3527         bond_for_each_slave(bond, slave, i) {
3528                 const struct rtnl_link_stats64 *sstats =
3529                         dev_get_stats(slave->dev, &temp);
3530
3531                 stats->rx_packets += sstats->rx_packets;
3532                 stats->rx_bytes += sstats->rx_bytes;
3533                 stats->rx_errors += sstats->rx_errors;
3534                 stats->rx_dropped += sstats->rx_dropped;
3535
3536                 stats->tx_packets += sstats->tx_packets;
3537                 stats->tx_bytes += sstats->tx_bytes;
3538                 stats->tx_errors += sstats->tx_errors;
3539                 stats->tx_dropped += sstats->tx_dropped;
3540
3541                 stats->multicast += sstats->multicast;
3542                 stats->collisions += sstats->collisions;
3543
3544                 stats->rx_length_errors += sstats->rx_length_errors;
3545                 stats->rx_over_errors += sstats->rx_over_errors;
3546                 stats->rx_crc_errors += sstats->rx_crc_errors;
3547                 stats->rx_frame_errors += sstats->rx_frame_errors;
3548                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3549                 stats->rx_missed_errors += sstats->rx_missed_errors;
3550
3551                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3552                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3553                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3554                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3555                 stats->tx_window_errors += sstats->tx_window_errors;
3556         }
3557
3558         read_unlock_bh(&bond->lock);
3559
3560         return stats;
3561 }
3562
3563 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3564 {
3565         struct net_device *slave_dev = NULL;
3566         struct ifbond k_binfo;
3567         struct ifbond __user *u_binfo = NULL;
3568         struct ifslave k_sinfo;
3569         struct ifslave __user *u_sinfo = NULL;
3570         struct mii_ioctl_data *mii = NULL;
3571         int res = 0;
3572
3573         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3574
3575         switch (cmd) {
3576         case SIOCGMIIPHY:
3577                 mii = if_mii(ifr);
3578                 if (!mii)
3579                         return -EINVAL;
3580
3581                 mii->phy_id = 0;
3582                 /* Fall Through */
3583         case SIOCGMIIREG:
3584                 /*
3585                  * We do this again just in case we were called by SIOCGMIIREG
3586                  * instead of SIOCGMIIPHY.
3587                  */
3588                 mii = if_mii(ifr);
3589                 if (!mii)
3590                         return -EINVAL;
3591
3592
3593                 if (mii->reg_num == 1) {
3594                         struct bonding *bond = netdev_priv(bond_dev);
3595                         mii->val_out = 0;
3596                         read_lock(&bond->lock);
3597                         read_lock(&bond->curr_slave_lock);
3598                         if (netif_carrier_ok(bond->dev))
3599                                 mii->val_out = BMSR_LSTATUS;
3600
3601                         read_unlock(&bond->curr_slave_lock);
3602                         read_unlock(&bond->lock);
3603                 }
3604
3605                 return 0;
3606         case BOND_INFO_QUERY_OLD:
3607         case SIOCBONDINFOQUERY:
3608                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3609
3610                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3611                         return -EFAULT;
3612
3613                 res = bond_info_query(bond_dev, &k_binfo);
3614                 if (res == 0 &&
3615                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3616                         return -EFAULT;
3617
3618                 return res;
3619         case BOND_SLAVE_INFO_QUERY_OLD:
3620         case SIOCBONDSLAVEINFOQUERY:
3621                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3622
3623                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3624                         return -EFAULT;
3625
3626                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3627                 if (res == 0 &&
3628                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3629                         return -EFAULT;
3630
3631                 return res;
3632         default:
3633                 /* Go on */
3634                 break;
3635         }
3636
3637         if (!capable(CAP_NET_ADMIN))
3638                 return -EPERM;
3639
3640         slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3641
3642         pr_debug("slave_dev=%p:\n", slave_dev);
3643
3644         if (!slave_dev)
3645                 res = -ENODEV;
3646         else {
3647                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3648                 switch (cmd) {
3649                 case BOND_ENSLAVE_OLD:
3650                 case SIOCBONDENSLAVE:
3651                         res = bond_enslave(bond_dev, slave_dev);
3652                         break;
3653                 case BOND_RELEASE_OLD:
3654                 case SIOCBONDRELEASE:
3655                         res = bond_release(bond_dev, slave_dev);
3656                         break;
3657                 case BOND_SETHWADDR_OLD:
3658                 case SIOCBONDSETHWADDR:
3659                         res = bond_sethwaddr(bond_dev, slave_dev);
3660                         break;
3661                 case BOND_CHANGE_ACTIVE_OLD:
3662                 case SIOCBONDCHANGEACTIVE:
3663                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3664                         break;
3665                 default:
3666                         res = -EOPNOTSUPP;
3667                 }
3668
3669                 dev_put(slave_dev);
3670         }
3671
3672         return res;
3673 }
3674
3675 static bool bond_addr_in_mc_list(unsigned char *addr,
3676                                  struct netdev_hw_addr_list *list,
3677                                  int addrlen)
3678 {
3679         struct netdev_hw_addr *ha;
3680
3681         netdev_hw_addr_list_for_each(ha, list)
3682                 if (!memcmp(ha->addr, addr, addrlen))
3683                         return true;
3684
3685         return false;
3686 }
3687
3688 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3689 {
3690         struct bonding *bond = netdev_priv(bond_dev);
3691
3692         if (change & IFF_PROMISC)
3693                 bond_set_promiscuity(bond,
3694                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3695
3696         if (change & IFF_ALLMULTI)
3697                 bond_set_allmulti(bond,
3698                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3699 }
3700
3701 static void bond_set_multicast_list(struct net_device *bond_dev)
3702 {
3703         struct bonding *bond = netdev_priv(bond_dev);
3704         struct netdev_hw_addr *ha;
3705         bool found;
3706
3707         read_lock(&bond->lock);
3708
3709         /* looking for addresses to add to slaves' mc list */
3710         netdev_for_each_mc_addr(ha, bond_dev) {
3711                 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3712                                              bond_dev->addr_len);
3713                 if (!found)
3714                         bond_mc_add(bond, ha->addr);
3715         }
3716
3717         /* looking for addresses to delete from slaves' list */
3718         netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3719                 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3720                                              bond_dev->addr_len);
3721                 if (!found)
3722                         bond_mc_del(bond, ha->addr);
3723         }
3724
3725         /* save master's multicast list */
3726         __hw_addr_flush(&bond->mc_list);
3727         __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3728                                bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3729
3730         read_unlock(&bond->lock);
3731 }
3732
3733 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
3734 {
3735         struct bonding *bond = netdev_priv(dev);
3736         struct slave *slave = bond->first_slave;
3737
3738         if (slave) {
3739                 const struct net_device_ops *slave_ops
3740                         = slave->dev->netdev_ops;
3741                 if (slave_ops->ndo_neigh_setup)
3742                         return slave_ops->ndo_neigh_setup(slave->dev, parms);
3743         }
3744         return 0;
3745 }
3746
3747 /*
3748  * Change the MTU of all of a master's slaves to match the master
3749  */
3750 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3751 {
3752         struct bonding *bond = netdev_priv(bond_dev);
3753         struct slave *slave, *stop_at;
3754         int res = 0;
3755         int i;
3756
3757         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3758                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3759
3760         /* Can't hold bond->lock with bh disabled here since
3761          * some base drivers panic. On the other hand we can't
3762          * hold bond->lock without bh disabled because we'll
3763          * deadlock. The only solution is to rely on the fact
3764          * that we're under rtnl_lock here, and the slaves
3765          * list won't change. This doesn't solve the problem
3766          * of setting the slave's MTU while it is
3767          * transmitting, but the assumption is that the base
3768          * driver can handle that.
3769          *
3770          * TODO: figure out a way to safely iterate the slaves
3771          * list, but without holding a lock around the actual
3772          * call to the base driver.
3773          */
3774
3775         bond_for_each_slave(bond, slave, i) {
3776                 pr_debug("s %p s->p %p c_m %p\n",
3777                          slave,
3778                          slave->prev,
3779                          slave->dev->netdev_ops->ndo_change_mtu);
3780
3781                 res = dev_set_mtu(slave->dev, new_mtu);
3782
3783                 if (res) {
3784                         /* If we failed to set the slave's mtu to the new value
3785                          * we must abort the operation even in ACTIVE_BACKUP
3786                          * mode, because if we allow the backup slaves to have
3787                          * different mtu values than the active slave we'll
3788                          * need to change their mtu when doing a failover. That
3789                          * means changing their mtu from timer context, which
3790                          * is probably not a good idea.
3791                          */
3792                         pr_debug("err %d %s\n", res, slave->dev->name);
3793                         goto unwind;
3794                 }
3795         }
3796
3797         bond_dev->mtu = new_mtu;
3798
3799         return 0;
3800
3801 unwind:
3802         /* unwind from head to the slave that failed */
3803         stop_at = slave;
3804         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3805                 int tmp_res;
3806
3807                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3808                 if (tmp_res) {
3809                         pr_debug("unwind err %d dev %s\n",
3810                                  tmp_res, slave->dev->name);
3811                 }
3812         }
3813
3814         return res;
3815 }
3816
3817 /*
3818  * Change HW address
3819  *
3820  * Note that many devices must be down to change the HW address, and
3821  * downing the master releases all slaves.  We can make bonds full of
3822  * bonding devices to test this, however.
3823  */
3824 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3825 {
3826         struct bonding *bond = netdev_priv(bond_dev);
3827         struct sockaddr *sa = addr, tmp_sa;
3828         struct slave *slave, *stop_at;
3829         int res = 0;
3830         int i;
3831
3832         if (bond->params.mode == BOND_MODE_ALB)
3833                 return bond_alb_set_mac_address(bond_dev, addr);
3834
3835
3836         pr_debug("bond=%p, name=%s\n",
3837                  bond, bond_dev ? bond_dev->name : "None");
3838
3839         /*
3840          * If fail_over_mac is set to active, do nothing and return
3841          * success.  Returning an error causes ifenslave to fail.
3842          */
3843         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3844                 return 0;
3845
3846         if (!is_valid_ether_addr(sa->sa_data))
3847                 return -EADDRNOTAVAIL;
3848
3849         /* Can't hold bond->lock with bh disabled here since
3850          * some base drivers panic. On the other hand we can't
3851          * hold bond->lock without bh disabled because we'll
3852          * deadlock. The only solution is to rely on the fact
3853          * that we're under rtnl_lock here, and the slaves
3854          * list won't change. This doesn't solve the problem
3855          * of setting the slave's hw address while it is
3856          * transmitting, but the assumption is that the base
3857          * driver can handle that.
3858          *
3859          * TODO: figure out a way to safely iterate the slaves
3860          * list, but without holding a lock around the actual
3861          * call to the base driver.
3862          */
3863
3864         bond_for_each_slave(bond, slave, i) {
3865                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3866                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3867
3868                 if (slave_ops->ndo_set_mac_address == NULL) {
3869                         res = -EOPNOTSUPP;
3870                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3871                         goto unwind;
3872                 }
3873
3874                 res = dev_set_mac_address(slave->dev, addr);
3875                 if (res) {
3876                         /* TODO: consider downing the slave
3877                          * and retry ?
3878                          * User should expect communications
3879                          * breakage anyway until ARP finish
3880                          * updating, so...
3881                          */
3882                         pr_debug("err %d %s\n", res, slave->dev->name);
3883                         goto unwind;
3884                 }
3885         }
3886
3887         /* success */
3888         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3889         return 0;
3890
3891 unwind:
3892         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3893         tmp_sa.sa_family = bond_dev->type;
3894
3895         /* unwind from head to the slave that failed */
3896         stop_at = slave;
3897         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3898                 int tmp_res;
3899
3900                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3901                 if (tmp_res) {
3902                         pr_debug("unwind err %d dev %s\n",
3903                                  tmp_res, slave->dev->name);
3904                 }
3905         }
3906
3907         return res;
3908 }
3909
3910 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3911 {
3912         struct bonding *bond = netdev_priv(bond_dev);
3913         struct slave *slave, *start_at;
3914         int i, slave_no, res = 1;
3915         struct iphdr *iph = ip_hdr(skb);
3916
3917         /*
3918          * Start with the curr_active_slave that joined the bond as the
3919          * default for sending IGMP traffic.  For failover purposes one
3920          * needs to maintain some consistency for the interface that will
3921          * send the join/membership reports.  The curr_active_slave found
3922          * will send all of this type of traffic.
3923          */
3924         if ((iph->protocol == IPPROTO_IGMP) &&
3925             (skb->protocol == htons(ETH_P_IP))) {
3926
3927                 read_lock(&bond->curr_slave_lock);
3928                 slave = bond->curr_active_slave;
3929                 read_unlock(&bond->curr_slave_lock);
3930
3931                 if (!slave)
3932                         goto out;
3933         } else {
3934                 /*
3935                  * Concurrent TX may collide on rr_tx_counter; we accept
3936                  * that as being rare enough not to justify using an
3937                  * atomic op here.
3938                  */
3939                 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3940
3941                 bond_for_each_slave(bond, slave, i) {
3942                         slave_no--;
3943                         if (slave_no < 0)
3944                                 break;
3945                 }
3946         }
3947
3948         start_at = slave;
3949         bond_for_each_slave_from(bond, slave, i, start_at) {
3950                 if (IS_UP(slave->dev) &&
3951                     (slave->link == BOND_LINK_UP) &&
3952                     bond_is_active_slave(slave)) {
3953                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3954                         break;
3955                 }
3956         }
3957
3958 out:
3959         if (res) {
3960                 /* no suitable interface, frame not sent */
3961                 dev_kfree_skb(skb);
3962         }
3963
3964         return NETDEV_TX_OK;
3965 }
3966
3967
3968 /*
3969  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3970  * the bond has a usable interface.
3971  */
3972 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3973 {
3974         struct bonding *bond = netdev_priv(bond_dev);
3975         int res = 1;
3976
3977         read_lock(&bond->curr_slave_lock);
3978
3979         if (bond->curr_active_slave)
3980                 res = bond_dev_queue_xmit(bond, skb,
3981                         bond->curr_active_slave->dev);
3982
3983         if (res)
3984                 /* no suitable interface, frame not sent */
3985                 dev_kfree_skb(skb);
3986
3987         read_unlock(&bond->curr_slave_lock);
3988
3989         return NETDEV_TX_OK;
3990 }
3991
3992 /*
3993  * In bond_xmit_xor() , we determine the output device by using a pre-
3994  * determined xmit_hash_policy(), If the selected device is not enabled,
3995  * find the next active slave.
3996  */
3997 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3998 {
3999         struct bonding *bond = netdev_priv(bond_dev);
4000         struct slave *slave, *start_at;
4001         int slave_no;
4002         int i;
4003         int res = 1;
4004
4005         slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4006
4007         bond_for_each_slave(bond, slave, i) {
4008                 slave_no--;
4009                 if (slave_no < 0)
4010                         break;
4011         }
4012
4013         start_at = slave;
4014
4015         bond_for_each_slave_from(bond, slave, i, start_at) {
4016                 if (IS_UP(slave->dev) &&
4017                     (slave->link == BOND_LINK_UP) &&
4018                     bond_is_active_slave(slave)) {
4019                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4020                         break;
4021                 }
4022         }
4023
4024         if (res) {
4025                 /* no suitable interface, frame not sent */
4026                 dev_kfree_skb(skb);
4027         }
4028
4029         return NETDEV_TX_OK;
4030 }
4031
4032 /*
4033  * in broadcast mode, we send everything to all usable interfaces.
4034  */
4035 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4036 {
4037         struct bonding *bond = netdev_priv(bond_dev);
4038         struct slave *slave, *start_at;
4039         struct net_device *tx_dev = NULL;
4040         int i;
4041         int res = 1;
4042
4043         read_lock(&bond->curr_slave_lock);
4044         start_at = bond->curr_active_slave;
4045         read_unlock(&bond->curr_slave_lock);
4046
4047         if (!start_at)
4048                 goto out;
4049
4050         bond_for_each_slave_from(bond, slave, i, start_at) {
4051                 if (IS_UP(slave->dev) &&
4052                     (slave->link == BOND_LINK_UP) &&
4053                     bond_is_active_slave(slave)) {
4054                         if (tx_dev) {
4055                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4056                                 if (!skb2) {
4057                                         pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4058                                                bond_dev->name);
4059                                         continue;
4060                                 }
4061
4062                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4063                                 if (res) {
4064                                         dev_kfree_skb(skb2);
4065                                         continue;
4066                                 }
4067                         }
4068                         tx_dev = slave->dev;
4069                 }
4070         }
4071
4072         if (tx_dev)
4073                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4074
4075 out:
4076         if (res)
4077                 /* no suitable interface, frame not sent */
4078                 dev_kfree_skb(skb);
4079
4080         /* frame sent to all suitable interfaces */
4081         return NETDEV_TX_OK;
4082 }
4083
4084 /*------------------------- Device initialization ---------------------------*/
4085
4086 static void bond_set_xmit_hash_policy(struct bonding *bond)
4087 {
4088         switch (bond->params.xmit_policy) {
4089         case BOND_XMIT_POLICY_LAYER23:
4090                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4091                 break;
4092         case BOND_XMIT_POLICY_LAYER34:
4093                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4094                 break;
4095         case BOND_XMIT_POLICY_LAYER2:
4096         default:
4097                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4098                 break;
4099         }
4100 }
4101
4102 /*
4103  * Lookup the slave that corresponds to a qid
4104  */
4105 static inline int bond_slave_override(struct bonding *bond,
4106                                       struct sk_buff *skb)
4107 {
4108         int i, res = 1;
4109         struct slave *slave = NULL;
4110         struct slave *check_slave;
4111
4112         if (!skb->queue_mapping)
4113                 return 1;
4114
4115         /* Find out if any slaves have the same mapping as this skb. */
4116         bond_for_each_slave(bond, check_slave, i) {
4117                 if (check_slave->queue_id == skb->queue_mapping) {
4118                         slave = check_slave;
4119                         break;
4120                 }
4121         }
4122
4123         /* If the slave isn't UP, use default transmit policy. */
4124         if (slave && slave->queue_id && IS_UP(slave->dev) &&
4125             (slave->link == BOND_LINK_UP)) {
4126                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4127         }
4128
4129         return res;
4130 }
4131
4132
4133 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4134 {
4135         /*
4136          * This helper function exists to help dev_pick_tx get the correct
4137          * destination queue.  Using a helper function skips a call to
4138          * skb_tx_hash and will put the skbs in the queue we expect on their
4139          * way down to the bonding driver.
4140          */
4141         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4142
4143         /*
4144          * Save the original txq to restore before passing to the driver
4145          */
4146         bond_queue_mapping(skb) = skb->queue_mapping;
4147
4148         if (unlikely(txq >= dev->real_num_tx_queues)) {
4149                 do {
4150                         txq -= dev->real_num_tx_queues;
4151                 } while (txq >= dev->real_num_tx_queues);
4152         }
4153         return txq;
4154 }
4155
4156 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4157 {
4158         struct bonding *bond = netdev_priv(dev);
4159
4160         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4161                 if (!bond_slave_override(bond, skb))
4162                         return NETDEV_TX_OK;
4163         }
4164
4165         switch (bond->params.mode) {
4166         case BOND_MODE_ROUNDROBIN:
4167                 return bond_xmit_roundrobin(skb, dev);
4168         case BOND_MODE_ACTIVEBACKUP:
4169                 return bond_xmit_activebackup(skb, dev);
4170         case BOND_MODE_XOR:
4171                 return bond_xmit_xor(skb, dev);
4172         case BOND_MODE_BROADCAST:
4173                 return bond_xmit_broadcast(skb, dev);
4174         case BOND_MODE_8023AD:
4175                 return bond_3ad_xmit_xor(skb, dev);
4176         case BOND_MODE_ALB:
4177         case BOND_MODE_TLB:
4178                 return bond_alb_xmit(skb, dev);
4179         default:
4180                 /* Should never happen, mode already checked */
4181                 pr_err("%s: Error: Unknown bonding mode %d\n",
4182                        dev->name, bond->params.mode);
4183                 WARN_ON_ONCE(1);
4184                 dev_kfree_skb(skb);
4185                 return NETDEV_TX_OK;
4186         }
4187 }
4188
4189 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4190 {
4191         struct bonding *bond = netdev_priv(dev);
4192         netdev_tx_t ret = NETDEV_TX_OK;
4193
4194         /*
4195          * If we risk deadlock from transmitting this in the
4196          * netpoll path, tell netpoll to queue the frame for later tx
4197          */
4198         if (is_netpoll_tx_blocked(dev))
4199                 return NETDEV_TX_BUSY;
4200
4201         read_lock(&bond->lock);
4202
4203         if (bond->slave_cnt)
4204                 ret = __bond_start_xmit(skb, dev);
4205         else
4206                 dev_kfree_skb(skb);
4207
4208         read_unlock(&bond->lock);
4209
4210         return ret;
4211 }
4212
4213 /*
4214  * set bond mode specific net device operations
4215  */
4216 void bond_set_mode_ops(struct bonding *bond, int mode)
4217 {
4218         struct net_device *bond_dev = bond->dev;
4219
4220         switch (mode) {
4221         case BOND_MODE_ROUNDROBIN:
4222                 break;
4223         case BOND_MODE_ACTIVEBACKUP:
4224                 break;
4225         case BOND_MODE_XOR:
4226                 bond_set_xmit_hash_policy(bond);
4227                 break;
4228         case BOND_MODE_BROADCAST:
4229                 break;
4230         case BOND_MODE_8023AD:
4231                 bond_set_xmit_hash_policy(bond);
4232                 break;
4233         case BOND_MODE_ALB:
4234                 /* FALLTHRU */
4235         case BOND_MODE_TLB:
4236                 break;
4237         default:
4238                 /* Should never happen, mode already checked */
4239                 pr_err("%s: Error: Unknown bonding mode %d\n",
4240                        bond_dev->name, mode);
4241                 break;
4242         }
4243 }
4244
4245 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4246                                     struct ethtool_drvinfo *drvinfo)
4247 {
4248         strncpy(drvinfo->driver, DRV_NAME, 32);
4249         strncpy(drvinfo->version, DRV_VERSION, 32);
4250         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4251 }
4252
4253 static const struct ethtool_ops bond_ethtool_ops = {
4254         .get_drvinfo            = bond_ethtool_get_drvinfo,
4255         .get_link               = ethtool_op_get_link,
4256 };
4257
4258 static const struct net_device_ops bond_netdev_ops = {
4259         .ndo_init               = bond_init,
4260         .ndo_uninit             = bond_uninit,
4261         .ndo_open               = bond_open,
4262         .ndo_stop               = bond_close,
4263         .ndo_start_xmit         = bond_start_xmit,
4264         .ndo_select_queue       = bond_select_queue,
4265         .ndo_get_stats64        = bond_get_stats,
4266         .ndo_do_ioctl           = bond_do_ioctl,
4267         .ndo_change_rx_flags    = bond_change_rx_flags,
4268         .ndo_set_rx_mode        = bond_set_multicast_list,
4269         .ndo_change_mtu         = bond_change_mtu,
4270         .ndo_set_mac_address    = bond_set_mac_address,
4271         .ndo_neigh_setup        = bond_neigh_setup,
4272         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4273         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4274 #ifdef CONFIG_NET_POLL_CONTROLLER
4275         .ndo_netpoll_setup      = bond_netpoll_setup,
4276         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4277         .ndo_poll_controller    = bond_poll_controller,
4278 #endif
4279         .ndo_add_slave          = bond_enslave,
4280         .ndo_del_slave          = bond_release,
4281         .ndo_fix_features       = bond_fix_features,
4282 };
4283
4284 static void bond_destructor(struct net_device *bond_dev)
4285 {
4286         struct bonding *bond = netdev_priv(bond_dev);
4287         if (bond->wq)
4288                 destroy_workqueue(bond->wq);
4289         free_netdev(bond_dev);
4290 }
4291
4292 static void bond_setup(struct net_device *bond_dev)
4293 {
4294         struct bonding *bond = netdev_priv(bond_dev);
4295
4296         /* initialize rwlocks */
4297         rwlock_init(&bond->lock);
4298         rwlock_init(&bond->curr_slave_lock);
4299
4300         bond->params = bonding_defaults;
4301
4302         /* Initialize pointers */
4303         bond->dev = bond_dev;
4304         INIT_LIST_HEAD(&bond->vlan_list);
4305
4306         /* Initialize the device entry points */
4307         ether_setup(bond_dev);
4308         bond_dev->netdev_ops = &bond_netdev_ops;
4309         bond_dev->ethtool_ops = &bond_ethtool_ops;
4310         bond_set_mode_ops(bond, bond->params.mode);
4311
4312         bond_dev->destructor = bond_destructor;
4313
4314         /* Initialize the device options */
4315         bond_dev->tx_queue_len = 0;
4316         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4317         bond_dev->priv_flags |= IFF_BONDING;
4318         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4319
4320         /* At first, we block adding VLANs. That's the only way to
4321          * prevent problems that occur when adding VLANs over an
4322          * empty bond. The block will be removed once non-challenged
4323          * slaves are enslaved.
4324          */
4325         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4326
4327         /* don't acquire bond device's netif_tx_lock when
4328          * transmitting */
4329         bond_dev->features |= NETIF_F_LLTX;
4330
4331         /* By default, we declare the bond to be fully
4332          * VLAN hardware accelerated capable. Special
4333          * care is taken in the various xmit functions
4334          * when there are slaves that are not hw accel
4335          * capable
4336          */
4337
4338         bond_dev->hw_features = BOND_VLAN_FEATURES |
4339                                 NETIF_F_HW_VLAN_TX |
4340                                 NETIF_F_HW_VLAN_RX |
4341                                 NETIF_F_HW_VLAN_FILTER;
4342
4343         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4344         bond_dev->features |= bond_dev->hw_features;
4345 }
4346
4347 static void bond_work_cancel_all(struct bonding *bond)
4348 {
4349         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4350                 cancel_delayed_work_sync(&bond->mii_work);
4351
4352         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4353                 cancel_delayed_work_sync(&bond->arp_work);
4354
4355         if (bond->params.mode == BOND_MODE_ALB &&
4356             delayed_work_pending(&bond->alb_work))
4357                 cancel_delayed_work_sync(&bond->alb_work);
4358
4359         if (bond->params.mode == BOND_MODE_8023AD &&
4360             delayed_work_pending(&bond->ad_work))
4361                 cancel_delayed_work_sync(&bond->ad_work);
4362
4363         if (delayed_work_pending(&bond->mcast_work))
4364                 cancel_delayed_work_sync(&bond->mcast_work);
4365 }
4366
4367 /*
4368 * Destroy a bonding device.
4369 * Must be under rtnl_lock when this function is called.
4370 */
4371 static void bond_uninit(struct net_device *bond_dev)
4372 {
4373         struct bonding *bond = netdev_priv(bond_dev);
4374         struct vlan_entry *vlan, *tmp;
4375
4376         bond_netpoll_cleanup(bond_dev);
4377
4378         /* Release the bonded slaves */
4379         bond_release_all(bond_dev);
4380
4381         list_del(&bond->bond_list);
4382
4383         bond_work_cancel_all(bond);
4384
4385         bond_remove_proc_entry(bond);
4386
4387         bond_debug_unregister(bond);
4388
4389         __hw_addr_flush(&bond->mc_list);
4390
4391         list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4392                 list_del(&vlan->vlan_list);
4393                 kfree(vlan);
4394         }
4395 }
4396
4397 /*------------------------- Module initialization ---------------------------*/
4398
4399 /*
4400  * Convert string input module parms.  Accept either the
4401  * number of the mode or its string name.  A bit complicated because
4402  * some mode names are substrings of other names, and calls from sysfs
4403  * may have whitespace in the name (trailing newlines, for example).
4404  */
4405 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4406 {
4407         int modeint = -1, i, rv;
4408         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4409
4410         for (p = (char *)buf; *p; p++)
4411                 if (!(isdigit(*p) || isspace(*p)))
4412                         break;
4413
4414         if (*p)
4415                 rv = sscanf(buf, "%20s", modestr);
4416         else
4417                 rv = sscanf(buf, "%d", &modeint);
4418
4419         if (!rv)
4420                 return -1;
4421
4422         for (i = 0; tbl[i].modename; i++) {
4423                 if (modeint == tbl[i].mode)
4424                         return tbl[i].mode;
4425                 if (strcmp(modestr, tbl[i].modename) == 0)
4426                         return tbl[i].mode;
4427         }
4428
4429         return -1;
4430 }
4431
4432 static int bond_check_params(struct bond_params *params)
4433 {
4434         int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4435
4436         /*
4437          * Convert string parameters.
4438          */
4439         if (mode) {
4440                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4441                 if (bond_mode == -1) {
4442                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4443                                mode == NULL ? "NULL" : mode);
4444                         return -EINVAL;
4445                 }
4446         }
4447
4448         if (xmit_hash_policy) {
4449                 if ((bond_mode != BOND_MODE_XOR) &&
4450                     (bond_mode != BOND_MODE_8023AD)) {
4451                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4452                                bond_mode_name(bond_mode));
4453                 } else {
4454                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4455                                                         xmit_hashtype_tbl);
4456                         if (xmit_hashtype == -1) {
4457                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4458                                        xmit_hash_policy == NULL ? "NULL" :
4459                                        xmit_hash_policy);
4460                                 return -EINVAL;
4461                         }
4462                 }
4463         }
4464
4465         if (lacp_rate) {
4466                 if (bond_mode != BOND_MODE_8023AD) {
4467                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4468                                 bond_mode_name(bond_mode));
4469                 } else {
4470                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4471                         if (lacp_fast == -1) {
4472                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4473                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4474                                 return -EINVAL;
4475                         }
4476                 }
4477         }
4478
4479         if (ad_select) {
4480                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4481                 if (params->ad_select == -1) {
4482                         pr_err("Error: Invalid ad_select \"%s\"\n",
4483                                ad_select == NULL ? "NULL" : ad_select);
4484                         return -EINVAL;
4485                 }
4486
4487                 if (bond_mode != BOND_MODE_8023AD) {
4488                         pr_warning("ad_select param only affects 802.3ad mode\n");
4489                 }
4490         } else {
4491                 params->ad_select = BOND_AD_STABLE;
4492         }
4493
4494         if (max_bonds < 0) {
4495                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4496                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4497                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4498         }
4499
4500         if (miimon < 0) {
4501                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4502                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4503                 miimon = BOND_LINK_MON_INTERV;
4504         }
4505
4506         if (updelay < 0) {
4507                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4508                            updelay, INT_MAX);
4509                 updelay = 0;
4510         }
4511
4512         if (downdelay < 0) {
4513                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4514                            downdelay, INT_MAX);
4515                 downdelay = 0;
4516         }
4517
4518         if ((use_carrier != 0) && (use_carrier != 1)) {
4519                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4520                            use_carrier);
4521                 use_carrier = 1;
4522         }
4523
4524         if (num_peer_notif < 0 || num_peer_notif > 255) {
4525                 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4526                            num_peer_notif);
4527                 num_peer_notif = 1;
4528         }
4529
4530         /* reset values for 802.3ad */
4531         if (bond_mode == BOND_MODE_8023AD) {
4532                 if (!miimon) {
4533                         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");
4534                         pr_warning("Forcing miimon to 100msec\n");
4535                         miimon = 100;
4536                 }
4537         }
4538
4539         if (tx_queues < 1 || tx_queues > 255) {
4540                 pr_warning("Warning: tx_queues (%d) should be between "
4541                            "1 and 255, resetting to %d\n",
4542                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4543                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4544         }
4545
4546         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4547                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4548                            "not of valid value (0/1), so it was set to "
4549                            "0\n", all_slaves_active);
4550                 all_slaves_active = 0;
4551         }
4552
4553         if (resend_igmp < 0 || resend_igmp > 255) {
4554                 pr_warning("Warning: resend_igmp (%d) should be between "
4555                            "0 and 255, resetting to %d\n",
4556                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4557                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4558         }
4559
4560         /* reset values for TLB/ALB */
4561         if ((bond_mode == BOND_MODE_TLB) ||
4562             (bond_mode == BOND_MODE_ALB)) {
4563                 if (!miimon) {
4564                         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");
4565                         pr_warning("Forcing miimon to 100msec\n");
4566                         miimon = 100;
4567                 }
4568         }
4569
4570         if (bond_mode == BOND_MODE_ALB) {
4571                 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",
4572                           updelay);
4573         }
4574
4575         if (!miimon) {
4576                 if (updelay || downdelay) {
4577                         /* just warn the user the up/down delay will have
4578                          * no effect since miimon is zero...
4579                          */
4580                         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",
4581                                    updelay, downdelay);
4582                 }
4583         } else {
4584                 /* don't allow arp monitoring */
4585                 if (arp_interval) {
4586                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4587                                    miimon, arp_interval);
4588                         arp_interval = 0;
4589                 }
4590
4591                 if ((updelay % miimon) != 0) {
4592                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4593                                    updelay, miimon,
4594                                    (updelay / miimon) * miimon);
4595                 }
4596
4597                 updelay /= miimon;
4598
4599                 if ((downdelay % miimon) != 0) {
4600                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4601                                    downdelay, miimon,
4602                                    (downdelay / miimon) * miimon);
4603                 }
4604
4605                 downdelay /= miimon;
4606         }
4607
4608         if (arp_interval < 0) {
4609                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4610                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4611                 arp_interval = BOND_LINK_ARP_INTERV;
4612         }
4613
4614         for (arp_ip_count = 0;
4615              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4616              arp_ip_count++) {
4617                 /* not complete check, but should be good enough to
4618                    catch mistakes */
4619                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4620                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4621                                    arp_ip_target[arp_ip_count]);
4622                         arp_interval = 0;
4623                 } else {
4624                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4625                         arp_target[arp_ip_count] = ip;
4626                 }
4627         }
4628
4629         if (arp_interval && !arp_ip_count) {
4630                 /* don't allow arping if no arp_ip_target given... */
4631                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4632                            arp_interval);
4633                 arp_interval = 0;
4634         }
4635
4636         if (arp_validate) {
4637                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4638                         pr_err("arp_validate only supported in active-backup mode\n");
4639                         return -EINVAL;
4640                 }
4641                 if (!arp_interval) {
4642                         pr_err("arp_validate requires arp_interval\n");
4643                         return -EINVAL;
4644                 }
4645
4646                 arp_validate_value = bond_parse_parm(arp_validate,
4647                                                      arp_validate_tbl);
4648                 if (arp_validate_value == -1) {
4649                         pr_err("Error: invalid arp_validate \"%s\"\n",
4650                                arp_validate == NULL ? "NULL" : arp_validate);
4651                         return -EINVAL;
4652                 }
4653         } else
4654                 arp_validate_value = 0;
4655
4656         if (miimon) {
4657                 pr_info("MII link monitoring set to %d ms\n", miimon);
4658         } else if (arp_interval) {
4659                 int i;
4660
4661                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4662                         arp_interval,
4663                         arp_validate_tbl[arp_validate_value].modename,
4664                         arp_ip_count);
4665
4666                 for (i = 0; i < arp_ip_count; i++)
4667                         pr_info(" %s", arp_ip_target[i]);
4668
4669                 pr_info("\n");
4670
4671         } else if (max_bonds) {
4672                 /* miimon and arp_interval not set, we need one so things
4673                  * work as expected, see bonding.txt for details
4674                  */
4675                 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");
4676         }
4677
4678         if (primary && !USES_PRIMARY(bond_mode)) {
4679                 /* currently, using a primary only makes sense
4680                  * in active backup, TLB or ALB modes
4681                  */
4682                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4683                            primary, bond_mode_name(bond_mode));
4684                 primary = NULL;
4685         }
4686
4687         if (primary && primary_reselect) {
4688                 primary_reselect_value = bond_parse_parm(primary_reselect,
4689                                                          pri_reselect_tbl);
4690                 if (primary_reselect_value == -1) {
4691                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4692                                primary_reselect ==
4693                                         NULL ? "NULL" : primary_reselect);
4694                         return -EINVAL;
4695                 }
4696         } else {
4697                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4698         }
4699
4700         if (fail_over_mac) {
4701                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4702                                                       fail_over_mac_tbl);
4703                 if (fail_over_mac_value == -1) {
4704                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4705                                arp_validate == NULL ? "NULL" : arp_validate);
4706                         return -EINVAL;
4707                 }
4708
4709                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4710                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4711         } else {
4712                 fail_over_mac_value = BOND_FOM_NONE;
4713         }
4714
4715         /* fill params struct with the proper values */
4716         params->mode = bond_mode;
4717         params->xmit_policy = xmit_hashtype;
4718         params->miimon = miimon;
4719         params->num_peer_notif = num_peer_notif;
4720         params->arp_interval = arp_interval;
4721         params->arp_validate = arp_validate_value;
4722         params->updelay = updelay;
4723         params->downdelay = downdelay;
4724         params->use_carrier = use_carrier;
4725         params->lacp_fast = lacp_fast;
4726         params->primary[0] = 0;
4727         params->primary_reselect = primary_reselect_value;
4728         params->fail_over_mac = fail_over_mac_value;
4729         params->tx_queues = tx_queues;
4730         params->all_slaves_active = all_slaves_active;
4731         params->resend_igmp = resend_igmp;
4732         params->min_links = min_links;
4733
4734         if (primary) {
4735                 strncpy(params->primary, primary, IFNAMSIZ);
4736                 params->primary[IFNAMSIZ - 1] = 0;
4737         }
4738
4739         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4740
4741         return 0;
4742 }
4743
4744 static struct lock_class_key bonding_netdev_xmit_lock_key;
4745 static struct lock_class_key bonding_netdev_addr_lock_key;
4746
4747 static void bond_set_lockdep_class_one(struct net_device *dev,
4748                                        struct netdev_queue *txq,
4749                                        void *_unused)
4750 {
4751         lockdep_set_class(&txq->_xmit_lock,
4752                           &bonding_netdev_xmit_lock_key);
4753 }
4754
4755 static void bond_set_lockdep_class(struct net_device *dev)
4756 {
4757         lockdep_set_class(&dev->addr_list_lock,
4758                           &bonding_netdev_addr_lock_key);
4759         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4760 }
4761
4762 /*
4763  * Called from registration process
4764  */
4765 static int bond_init(struct net_device *bond_dev)
4766 {
4767         struct bonding *bond = netdev_priv(bond_dev);
4768         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4769         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4770
4771         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4772
4773         /*
4774          * Initialize locks that may be required during
4775          * en/deslave operations.  All of the bond_open work
4776          * (of which this is part) should really be moved to
4777          * a phase prior to dev_open
4778          */
4779         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4780         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4781
4782         bond->wq = create_singlethread_workqueue(bond_dev->name);
4783         if (!bond->wq)
4784                 return -ENOMEM;
4785
4786         bond_set_lockdep_class(bond_dev);
4787
4788         bond_create_proc_entry(bond);
4789         list_add_tail(&bond->bond_list, &bn->dev_list);
4790
4791         bond_prepare_sysfs_group(bond);
4792
4793         bond_debug_register(bond);
4794
4795         __hw_addr_init(&bond->mc_list);
4796         return 0;
4797 }
4798
4799 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4800 {
4801         if (tb[IFLA_ADDRESS]) {
4802                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4803                         return -EINVAL;
4804                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4805                         return -EADDRNOTAVAIL;
4806         }
4807         return 0;
4808 }
4809
4810 static int bond_get_tx_queues(struct net *net, struct nlattr *tb[],
4811                               unsigned int *num_queues,
4812                               unsigned int *real_num_queues)
4813 {
4814         *num_queues = tx_queues;
4815         return 0;
4816 }
4817
4818 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4819         .kind           = "bond",
4820         .priv_size      = sizeof(struct bonding),
4821         .setup          = bond_setup,
4822         .validate       = bond_validate,
4823         .get_tx_queues  = bond_get_tx_queues,
4824 };
4825
4826 /* Create a new bond based on the specified name and bonding parameters.
4827  * If name is NULL, obtain a suitable "bond%d" name for us.
4828  * Caller must NOT hold rtnl_lock; we need to release it here before we
4829  * set up our sysfs entries.
4830  */
4831 int bond_create(struct net *net, const char *name)
4832 {
4833         struct net_device *bond_dev;
4834         int res;
4835
4836         rtnl_lock();
4837
4838         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4839                                    name ? name : "bond%d",
4840                                    bond_setup, tx_queues);
4841         if (!bond_dev) {
4842                 pr_err("%s: eek! can't alloc netdev!\n", name);
4843                 rtnl_unlock();
4844                 return -ENOMEM;
4845         }
4846
4847         dev_net_set(bond_dev, net);
4848         bond_dev->rtnl_link_ops = &bond_link_ops;
4849
4850         res = register_netdevice(bond_dev);
4851
4852         netif_carrier_off(bond_dev);
4853
4854         rtnl_unlock();
4855         if (res < 0)
4856                 bond_destructor(bond_dev);
4857         return res;
4858 }
4859
4860 static int __net_init bond_net_init(struct net *net)
4861 {
4862         struct bond_net *bn = net_generic(net, bond_net_id);
4863
4864         bn->net = net;
4865         INIT_LIST_HEAD(&bn->dev_list);
4866
4867         bond_create_proc_dir(bn);
4868         bond_create_sysfs(bn);
4869
4870         return 0;
4871 }
4872
4873 static void __net_exit bond_net_exit(struct net *net)
4874 {
4875         struct bond_net *bn = net_generic(net, bond_net_id);
4876
4877         bond_destroy_sysfs(bn);
4878         bond_destroy_proc_dir(bn);
4879 }
4880
4881 static struct pernet_operations bond_net_ops = {
4882         .init = bond_net_init,
4883         .exit = bond_net_exit,
4884         .id   = &bond_net_id,
4885         .size = sizeof(struct bond_net),
4886 };
4887
4888 static int __init bonding_init(void)
4889 {
4890         int i;
4891         int res;
4892
4893         pr_info("%s", bond_version);
4894
4895         res = bond_check_params(&bonding_defaults);
4896         if (res)
4897                 goto out;
4898
4899         res = register_pernet_subsys(&bond_net_ops);
4900         if (res)
4901                 goto out;
4902
4903         res = rtnl_link_register(&bond_link_ops);
4904         if (res)
4905                 goto err_link;
4906
4907         bond_create_debugfs();
4908
4909         for (i = 0; i < max_bonds; i++) {
4910                 res = bond_create(&init_net, NULL);
4911                 if (res)
4912                         goto err;
4913         }
4914
4915         register_netdevice_notifier(&bond_netdev_notifier);
4916         register_inetaddr_notifier(&bond_inetaddr_notifier);
4917 out:
4918         return res;
4919 err:
4920         rtnl_link_unregister(&bond_link_ops);
4921 err_link:
4922         unregister_pernet_subsys(&bond_net_ops);
4923         goto out;
4924
4925 }
4926
4927 static void __exit bonding_exit(void)
4928 {
4929         unregister_netdevice_notifier(&bond_netdev_notifier);
4930         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4931
4932         bond_destroy_debugfs();
4933
4934         rtnl_link_unregister(&bond_link_ops);
4935         unregister_pernet_subsys(&bond_net_ops);
4936
4937 #ifdef CONFIG_NET_POLL_CONTROLLER
4938         /*
4939          * Make sure we don't have an imbalance on our netpoll blocking
4940          */
4941         WARN_ON(atomic_read(&netpoll_block_tx));
4942 #endif
4943 }
4944
4945 module_init(bonding_init);
4946 module_exit(bonding_exit);
4947 MODULE_LICENSE("GPL");
4948 MODULE_VERSION(DRV_VERSION);
4949 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4950 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4951 MODULE_ALIAS_RTNL_LINK("bond");