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 miimon       = BOND_LINK_MON_INTERV;
  93 static int updelay;
  94 static int downdelay;
  95 static int use_carrier  = 1;
  96 static char *mode;
  97 static char *primary;
  98 static char *primary_reselect;
  99 static char *lacp_rate;
 100 static char *ad_select;
 101 static char *xmit_hash_policy;
 102 static int arp_interval = BOND_LINK_ARP_INTERV;
 103 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 104 static char *arp_validate;
 105 static char *fail_over_mac;
 106 static int all_slaves_active = 0;
 107 static struct bond_params bonding_defaults;
 108 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 109
 110 module_param(max_bonds, int, 0);
 111 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 112 module_param(tx_queues, int, 0);
 113 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 114 module_param(miimon, int, 0);
 115 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 116 module_param(updelay, int, 0);
 117 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 118 module_param(downdelay, int, 0);
 119 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 120                             "in milliseconds");
 121 module_param(use_carrier, int, 0);
 122 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 123                               "0 for off, 1 for on (default)");
 124 module_param(mode, charp, 0);
 125 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
 126                        "1 for active-backup, 2 for balance-xor, "
 127                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 128                        "6 for balance-alb");
 129 module_param(primary, charp, 0);
 130 MODULE_PARM_DESC(primary, "Primary network device to use");
 131 module_param(primary_reselect, charp, 0);
 132 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 133                                    "once it comes up; "
 134                                    "0 for always (default), "
 135                                    "1 for only if speed of primary is "
 136                                    "better, "
 137                                    "2 for only on active slave "
 138                                    "failure");
 139 module_param(lacp_rate, charp, 0);
 140 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
 141                             "(slow/fast)");
 142 module_param(ad_select, charp, 0);
 143 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
 144 module_param(xmit_hash_policy, charp, 0);
 145 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
 146                                    ", 1 for layer 3+4");
 147 module_param(arp_interval, int, 0);
 148 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 149 module_param_array(arp_ip_target, charp, NULL, 0);
 150 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 151 module_param(arp_validate, charp, 0);
 152 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
 153 module_param(fail_over_mac, charp, 0);
 154 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
 155 module_param(all_slaves_active, int, 0);
 156 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 157                                      "by setting active flag for all slaves.  "
 158                                      "0 for never (default), 1 for always.");
 159 module_param(resend_igmp, int, 0);
 160 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on link failure");
 161
 162 /*----------------------------- Global variables ----------------------------*/
 163
 164 #ifdef CONFIG_NET_POLL_CONTROLLER
 165 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 166 #endif
 167
 168 int bond_net_id __read_mostly;
 169
 170 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 171 static int arp_ip_count;
 172 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 173 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 174 static int lacp_fast;
 175
 176 const struct bond_parm_tbl bond_lacp_tbl[] = {
 177 {       "slow",         AD_LACP_SLOW},
 178 {       "fast",         AD_LACP_FAST},
 179 {       NULL,           -1},
 180 };
 181
 182 const struct bond_parm_tbl bond_mode_tbl[] = {
 183 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
 184 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
 185 {       "balance-xor",          BOND_MODE_XOR},
 186 {       "broadcast",            BOND_MODE_BROADCAST},
 187 {       "802.3ad",              BOND_MODE_8023AD},
 188 {       "balance-tlb",          BOND_MODE_TLB},
 189 {       "balance-alb",          BOND_MODE_ALB},
 190 {       NULL,                   -1},
 191 };
 192
 193 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
 194 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
 195 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
 196 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
 197 {       NULL,                   -1},
 198 };
 199
 200 const struct bond_parm_tbl arp_validate_tbl[] = {
 201 {       "none",                 BOND_ARP_VALIDATE_NONE},
 202 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
 203 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
 204 {       "all",                  BOND_ARP_VALIDATE_ALL},
 205 {       NULL,                   -1},
 206 };
 207
 208 const struct bond_parm_tbl fail_over_mac_tbl[] = {
 209 {       "none",                 BOND_FOM_NONE},
 210 {       "active",               BOND_FOM_ACTIVE},
 211 {       "follow",               BOND_FOM_FOLLOW},
 212 {       NULL,                   -1},
 213 };
 214
 215 const struct bond_parm_tbl pri_reselect_tbl[] = {
 216 {       "always",               BOND_PRI_RESELECT_ALWAYS},
 217 {       "better",               BOND_PRI_RESELECT_BETTER},
 218 {       "failure",              BOND_PRI_RESELECT_FAILURE},
 219 {       NULL,                   -1},
 220 };
 221
 222 struct bond_parm_tbl ad_select_tbl[] = {
 223 {       "stable",       BOND_AD_STABLE},
 224 {       "bandwidth",    BOND_AD_BANDWIDTH},
 225 {       "count",        BOND_AD_COUNT},
 226 {       NULL,           -1},
 227 };
 228
 229 /*-------------------------- Forward declarations ---------------------------*/
 230
 231 static int bond_init(struct net_device *bond_dev);
 232 static void bond_uninit(struct net_device *bond_dev);
 233
 234 /*---------------------------- General routines -----------------------------*/
 235
 236 const char *bond_mode_name(int mode)
 237 {
 238         static const char *names[] = {
 239                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 240                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 241                 [BOND_MODE_XOR] = "load balancing (xor)",
 242                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 243                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 244                 [BOND_MODE_TLB] = "transmit load balancing",
 245                 [BOND_MODE_ALB] = "adaptive load balancing",
 246         };
 247
 248         if (mode < 0 || mode > BOND_MODE_ALB)
 249                 return "unknown";
 250
 251         return names[mode];
 252 }
 253
 254 /*---------------------------------- VLAN -----------------------------------*/
 255
 256 /**
 257  * bond_add_vlan - add a new vlan id on bond
 258  * @bond: bond that got the notification
 259  * @vlan_id: the vlan id to add
 260  *
 261  * Returns -ENOMEM if allocation failed.
 262  */
 263 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
 264 {
 265         struct vlan_entry *vlan;
 266
 267         pr_debug("bond: %s, vlan id %d\n",
 268                  (bond ? bond->dev->name : "None"), vlan_id);
 269
 270         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
 271         if (!vlan)
 272                 return -ENOMEM;
 273
 274         INIT_LIST_HEAD(&vlan->vlan_list);
 275         vlan->vlan_id = vlan_id;
 276
 277         write_lock_bh(&bond->lock);
 278
 279         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
 280
 281         write_unlock_bh(&bond->lock);
 282
 283         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
 284
 285         return 0;
 286 }
 287
 288 /**
 289  * bond_del_vlan - delete a vlan id from bond
 290  * @bond: bond that got the notification
 291  * @vlan_id: the vlan id to delete
 292  *
 293  * returns -ENODEV if @vlan_id was not found in @bond.
 294  */
 295 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
 296 {
 297         struct vlan_entry *vlan;
 298         int res = -ENODEV;
 299
 300         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
 301
 302         block_netpoll_tx();
 303         write_lock_bh(&bond->lock);
 304
 305         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 306                 if (vlan->vlan_id == vlan_id) {
 307                         list_del(&vlan->vlan_list);
 308
 309                         if (bond_is_lb(bond))
 310                                 bond_alb_clear_vlan(bond, vlan_id);
 311
 312                         pr_debug("removed VLAN ID %d from bond %s\n",
 313                                  vlan_id, bond->dev->name);
 314
 315                         kfree(vlan);
 316
 317                         if (list_empty(&bond->vlan_list) &&
 318                             (bond->slave_cnt == 0)) {
 319                                 /* Last VLAN removed and no slaves, so
 320                                  * restore block on adding VLANs. This will
 321                                  * be removed once new slaves that are not
 322                                  * VLAN challenged will be added.
 323                                  */
 324                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
 325                         }
 326
 327                         res = 0;
 328                         goto out;
 329                 }
 330         }
 331
 332         pr_debug("couldn't find VLAN ID %d in bond %s\n",
 333                  vlan_id, bond->dev->name);
 334
 335 out:
 336         write_unlock_bh(&bond->lock);
 337         unblock_netpoll_tx();
 338         return res;
 339 }
 340
 341 /**
 342  * bond_has_challenged_slaves
 343  * @bond: the bond we're working on
 344  *
 345  * Searches the slave list. Returns 1 if a vlan challenged slave
 346  * was found, 0 otherwise.
 347  *
 348  * Assumes bond->lock is held.
 349  */
 350 static int bond_has_challenged_slaves(struct bonding *bond)
 351 {
 352         struct slave *slave;
 353         int i;
 354
 355         bond_for_each_slave(bond, slave, i) {
 356                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
 357                         pr_debug("found VLAN challenged slave - %s\n",
 358                                  slave->dev->name);
 359                         return 1;
 360                 }
 361         }
 362
 363         pr_debug("no VLAN challenged slaves found\n");
 364         return 0;
 365 }
 366
 367 /**
 368  * bond_next_vlan - safely skip to the next item in the vlans list.
 369  * @bond: the bond we're working on
 370  * @curr: item we're advancing from
 371  *
 372  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 373  * or @curr->next otherwise (even if it is @curr itself again).
 374  *
 375  * Caller must hold bond->lock
 376  */
 377 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
 378 {
 379         struct vlan_entry *next, *last;
 380
 381         if (list_empty(&bond->vlan_list))
 382                 return NULL;
 383
 384         if (!curr) {
 385                 next = list_entry(bond->vlan_list.next,
 386                                   struct vlan_entry, vlan_list);
 387         } else {
 388                 last = list_entry(bond->vlan_list.prev,
 389                                   struct vlan_entry, vlan_list);
 390                 if (last == curr) {
 391                         next = list_entry(bond->vlan_list.next,
 392                                           struct vlan_entry, vlan_list);
 393                 } else {
 394                         next = list_entry(curr->vlan_list.next,
 395                                           struct vlan_entry, vlan_list);
 396                 }
 397         }
 398
 399         return next;
 400 }
 401
 402 /**
 403  * bond_dev_queue_xmit - Prepare skb for xmit.
 404  *
 405  * @bond: bond device that got this skb for tx.
 406  * @skb: hw accel VLAN tagged skb to transmit
 407  * @slave_dev: slave that is supposed to xmit this skbuff
 408  */
 409 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 410                         struct net_device *slave_dev)
 411 {
 412         skb->dev = slave_dev;
 413         skb->priority = 1;
 414         if (unlikely(netpoll_tx_running(slave_dev)))
 415                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 416         else
 417                 dev_queue_xmit(skb);
 418
 419         return 0;
 420 }
 421
 422 /*
 423  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 424  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 425  * lock because:
 426  * a. This operation is performed in IOCTL context,
 427  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 428  * c. Holding a lock with BH disabled while directly calling a base driver
 429  *    entry point is generally a BAD idea.
 430  *
 431  * The design of synchronization/protection for this operation in the 8021q
 432  * module is good for one or more VLAN devices over a single physical device
 433  * and cannot be extended for a teaming solution like bonding, so there is a
 434  * potential race condition here where a net device from the vlan group might
 435  * be referenced (either by a base driver or the 8021q code) while it is being
 436  * removed from the system. However, it turns out we're not making matters
 437  * worse, and if it works for regular VLAN usage it will work here too.
 438 */
 439
 440 /**
 441  * bond_vlan_rx_register - Propagates registration to slaves
 442  * @bond_dev: bonding net device that got called
 443  * @grp: vlan group being registered
 444  */
 445 static void bond_vlan_rx_register(struct net_device *bond_dev,
 446                                   struct vlan_group *grp)
 447 {
 448         struct bonding *bond = netdev_priv(bond_dev);
 449         struct slave *slave;
 450         int i;
 451
 452         write_lock_bh(&bond->lock);
 453         bond->vlgrp = grp;
 454         write_unlock_bh(&bond->lock);
 455
 456         bond_for_each_slave(bond, slave, i) {
 457                 struct net_device *slave_dev = slave->dev;
 458                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 459
 460                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 461                     slave_ops->ndo_vlan_rx_register) {
 462                         slave_ops->ndo_vlan_rx_register(slave_dev, grp);
 463                 }
 464         }
 465 }
 466
 467 /**
 468  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 469  * @bond_dev: bonding net device that got called
 470  * @vid: vlan id being added
 471  */
 472 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
 473 {
 474         struct bonding *bond = netdev_priv(bond_dev);
 475         struct slave *slave;
 476         int i, res;
 477
 478         bond_for_each_slave(bond, slave, i) {
 479                 struct net_device *slave_dev = slave->dev;
 480                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 481
 482                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 483                     slave_ops->ndo_vlan_rx_add_vid) {
 484                         slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
 485                 }
 486         }
 487
 488         res = bond_add_vlan(bond, vid);
 489         if (res) {
 490                 pr_err("%s: Error: Failed to add vlan id %d\n",
 491                        bond_dev->name, vid);
 492         }
 493 }
 494
 495 /**
 496  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 497  * @bond_dev: bonding net device that got called
 498  * @vid: vlan id being removed
 499  */
 500 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
 501 {
 502         struct bonding *bond = netdev_priv(bond_dev);
 503         struct slave *slave;
 504         struct net_device *vlan_dev;
 505         int i, res;
 506
 507         bond_for_each_slave(bond, slave, i) {
 508                 struct net_device *slave_dev = slave->dev;
 509                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 510
 511                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 512                     slave_ops->ndo_vlan_rx_kill_vid) {
 513                         /* Save and then restore vlan_dev in the grp array,
 514                          * since the slave's driver might clear it.
 515                          */
 516                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
 517                         slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
 518                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
 519                 }
 520         }
 521
 522         res = bond_del_vlan(bond, vid);
 523         if (res) {
 524                 pr_err("%s: Error: Failed to remove vlan id %d\n",
 525                        bond_dev->name, vid);
 526         }
 527 }
 528
 529 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
 530 {
 531         struct vlan_entry *vlan;
 532         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 533
 534         if (!bond->vlgrp)
 535                 return;
 536
 537         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 538             slave_ops->ndo_vlan_rx_register)
 539                 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
 540
 541         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 542             !(slave_ops->ndo_vlan_rx_add_vid))
 543                 return;
 544
 545         list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
 546                 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
 547 }
 548
 549 static void bond_del_vlans_from_slave(struct bonding *bond,
 550                                       struct net_device *slave_dev)
 551 {
 552         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 553         struct vlan_entry *vlan;
 554         struct net_device *vlan_dev;
 555
 556         if (!bond->vlgrp)
 557                 return;
 558
 559         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
 560             !(slave_ops->ndo_vlan_rx_kill_vid))
 561                 goto unreg;
 562
 563         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 564                 if (!vlan->vlan_id)
 565                         continue;
 566                 /* Save and then restore vlan_dev in the grp array,
 567                  * since the slave's driver might clear it.
 568                  */
 569                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
 570                 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
 571                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
 572         }
 573
 574 unreg:
 575         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
 576             slave_ops->ndo_vlan_rx_register)
 577                 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
 578 }
 579
 580 /*------------------------------- Link status -------------------------------*/
 581
 582 /*
 583  * Set the carrier state for the master according to the state of its
 584  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 585  * do special 802.3ad magic.
 586  *
 587  * Returns zero if carrier state does not change, nonzero if it does.
 588  */
 589 static int bond_set_carrier(struct bonding *bond)
 590 {
 591         struct slave *slave;
 592         int i;
 593
 594         if (bond->slave_cnt == 0)
 595                 goto down;
 596
 597         if (bond->params.mode == BOND_MODE_8023AD)
 598                 return bond_3ad_set_carrier(bond);
 599
 600         bond_for_each_slave(bond, slave, i) {
 601                 if (slave->link == BOND_LINK_UP) {
 602                         if (!netif_carrier_ok(bond->dev)) {
 603                                 netif_carrier_on(bond->dev);
 604                                 return 1;
 605                         }
 606                         return 0;
 607                 }
 608         }
 609
 610 down:
 611         if (netif_carrier_ok(bond->dev)) {
 612                 netif_carrier_off(bond->dev);
 613                 return 1;
 614         }
 615         return 0;
 616 }
 617
 618 /*
 619  * Get link speed and duplex from the slave's base driver
 620  * using ethtool. If for some reason the call fails or the
 621  * values are invalid, fake speed and duplex to 100/Full
 622  * and return error.
 623  */
 624 static int bond_update_speed_duplex(struct slave *slave)
 625 {
 626         struct net_device *slave_dev = slave->dev;
 627         struct ethtool_cmd etool = { .cmd = ETHTOOL_GSET };
 628         u32 slave_speed;
 629         int res;
 630
 631         /* Fake speed and duplex */
 632         slave->speed = SPEED_100;
 633         slave->duplex = DUPLEX_FULL;
 634
 635         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
 636                 return -1;
 637
 638         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
 639         if (res < 0)
 640                 return -1;
 641
 642         slave_speed = ethtool_cmd_speed(&etool);
 643         switch (slave_speed) {
 644         case SPEED_10:
 645         case SPEED_100:
 646         case SPEED_1000:
 647         case SPEED_10000:
 648                 break;
 649         default:
 650                 return -1;
 651         }
 652
 653         switch (etool.duplex) {
 654         case DUPLEX_FULL:
 655         case DUPLEX_HALF:
 656                 break;
 657         default:
 658                 return -1;
 659         }
 660
 661         slave->speed = slave_speed;
 662         slave->duplex = etool.duplex;
 663
 664         return 0;
 665 }
 666
 667 /*
 668  * if <dev> supports MII link status reporting, check its link status.
 669  *
 670  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 671  * depending upon the setting of the use_carrier parameter.
 672  *
 673  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 674  * can't tell and just pretend it is), or 0, meaning that the link is
 675  * down.
 676  *
 677  * If reporting is non-zero, instead of faking link up, return -1 if
 678  * both ETHTOOL and MII ioctls fail (meaning the device does not
 679  * support them).  If use_carrier is set, return whatever it says.
 680  * It'd be nice if there was a good way to tell if a driver supports
 681  * netif_carrier, but there really isn't.
 682  */
 683 static int bond_check_dev_link(struct bonding *bond,
 684                                struct net_device *slave_dev, int reporting)
 685 {
 686         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 687         int (*ioctl)(struct net_device *, struct ifreq *, int);
 688         struct ifreq ifr;
 689         struct mii_ioctl_data *mii;
 690
 691         if (!reporting && !netif_running(slave_dev))
 692                 return 0;
 693
 694         if (bond->params.use_carrier)
 695                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 696
 697         /* Try to get link status using Ethtool first. */
 698         if (slave_dev->ethtool_ops) {
 699                 if (slave_dev->ethtool_ops->get_link) {
 700                         u32 link;
 701
 702                         link = slave_dev->ethtool_ops->get_link(slave_dev);
 703
 704                         return link ? BMSR_LSTATUS : 0;
 705                 }
 706         }
 707
 708         /* Ethtool can't be used, fallback to MII ioctls. */
 709         ioctl = slave_ops->ndo_do_ioctl;
 710         if (ioctl) {
 711                 /* TODO: set pointer to correct ioctl on a per team member */
 712                 /*       bases to make this more efficient. that is, once  */
 713                 /*       we determine the correct ioctl, we will always    */
 714                 /*       call it and not the others for that team          */
 715                 /*       member.                                           */
 716
 717                 /*
 718                  * We cannot assume that SIOCGMIIPHY will also read a
 719                  * register; not all network drivers (e.g., e100)
 720                  * support that.
 721                  */
 722
 723                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 724                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 725                 mii = if_mii(&ifr);
 726                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 727                         mii->reg_num = MII_BMSR;
 728                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 729                                 return mii->val_out & BMSR_LSTATUS;
 730                 }
 731         }
 732
 733         /*
 734          * If reporting, report that either there's no dev->do_ioctl,
 735          * or both SIOCGMIIREG and get_link failed (meaning that we
 736          * cannot report link status).  If not reporting, pretend
 737          * we're ok.
 738          */
 739         return reporting ? -1 : BMSR_LSTATUS;
 740 }
 741
 742 /*----------------------------- Multicast list ------------------------------*/
 743
 744 /*
 745  * Push the promiscuity flag down to appropriate slaves
 746  */
 747 static int bond_set_promiscuity(struct bonding *bond, int inc)
 748 {
 749         int err = 0;
 750         if (USES_PRIMARY(bond->params.mode)) {
 751                 /* write lock already acquired */
 752                 if (bond->curr_active_slave) {
 753                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
 754                                                   inc);
 755                 }
 756         } else {
 757                 struct slave *slave;
 758                 int i;
 759                 bond_for_each_slave(bond, slave, i) {
 760                         err = dev_set_promiscuity(slave->dev, inc);
 761                         if (err)
 762                                 return err;
 763                 }
 764         }
 765         return err;
 766 }
 767
 768 /*
 769  * Push the allmulti flag down to all slaves
 770  */
 771 static int bond_set_allmulti(struct bonding *bond, int inc)
 772 {
 773         int err = 0;
 774         if (USES_PRIMARY(bond->params.mode)) {
 775                 /* write lock already acquired */
 776                 if (bond->curr_active_slave) {
 777                         err = dev_set_allmulti(bond->curr_active_slave->dev,
 778                                                inc);
 779                 }
 780         } else {
 781                 struct slave *slave;
 782                 int i;
 783                 bond_for_each_slave(bond, slave, i) {
 784                         err = dev_set_allmulti(slave->dev, inc);
 785                         if (err)
 786                                 return err;
 787                 }
 788         }
 789         return err;
 790 }
 791
 792 /*
 793  * Add a Multicast address to slaves
 794  * according to mode
 795  */
 796 static void bond_mc_add(struct bonding *bond, void *addr)
 797 {
 798         if (USES_PRIMARY(bond->params.mode)) {
 799                 /* write lock already acquired */
 800                 if (bond->curr_active_slave)
 801                         dev_mc_add(bond->curr_active_slave->dev, addr);
 802         } else {
 803                 struct slave *slave;
 804                 int i;
 805
 806                 bond_for_each_slave(bond, slave, i)
 807                         dev_mc_add(slave->dev, addr);
 808         }
 809 }
 810
 811 /*
 812  * Remove a multicast address from slave
 813  * according to mode
 814  */
 815 static void bond_mc_del(struct bonding *bond, void *addr)
 816 {
 817         if (USES_PRIMARY(bond->params.mode)) {
 818                 /* write lock already acquired */
 819                 if (bond->curr_active_slave)
 820                         dev_mc_del(bond->curr_active_slave->dev, addr);
 821         } else {
 822                 struct slave *slave;
 823                 int i;
 824                 bond_for_each_slave(bond, slave, i) {
 825                         dev_mc_del(slave->dev, addr);
 826                 }
 827         }
 828 }
 829
 830
 831 static void __bond_resend_igmp_join_requests(struct net_device *dev)
 832 {
 833         struct in_device *in_dev;
 834
 835         rcu_read_lock();
 836         in_dev = __in_dev_get_rcu(dev);
 837         if (in_dev)
 838                 ip_mc_rejoin_groups(in_dev);
 839         rcu_read_unlock();
 840 }
 841
 842 /*
 843  * Retrieve the list of registered multicast addresses for the bonding
 844  * device and retransmit an IGMP JOIN request to the current active
 845  * slave.
 846  */
 847 static void bond_resend_igmp_join_requests(struct bonding *bond)
 848 {
 849         struct net_device *vlan_dev;
 850         struct vlan_entry *vlan;
 851
 852         read_lock(&bond->lock);
 853
 854         /* rejoin all groups on bond device */
 855         __bond_resend_igmp_join_requests(bond->dev);
 856
 857         /* rejoin all groups on vlan devices */
 858         if (bond->vlgrp) {
 859                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
 860                         vlan_dev = vlan_group_get_device(bond->vlgrp,
 861                                                          vlan->vlan_id);
 862                         if (vlan_dev)
 863                                 __bond_resend_igmp_join_requests(vlan_dev);
 864                 }
 865         }
 866
 867         if (--bond->igmp_retrans > 0)
 868                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 869
 870         read_unlock(&bond->lock);
 871 }
 872
 873 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 874 {
 875         struct bonding *bond = container_of(work, struct bonding,
 876                                                         mcast_work.work);
 877         bond_resend_igmp_join_requests(bond);
 878 }
 879
 880 /*
 881  * flush all members of flush->mc_list from device dev->mc_list
 882  */
 883 static void bond_mc_list_flush(struct net_device *bond_dev,
 884                                struct net_device *slave_dev)
 885 {
 886         struct bonding *bond = netdev_priv(bond_dev);
 887         struct netdev_hw_addr *ha;
 888
 889         netdev_for_each_mc_addr(ha, bond_dev)
 890                 dev_mc_del(slave_dev, ha->addr);
 891
 892         if (bond->params.mode == BOND_MODE_8023AD) {
 893                 /* del lacpdu mc addr from mc list */
 894                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 895
 896                 dev_mc_del(slave_dev, lacpdu_multicast);
 897         }
 898 }
 899
 900 /*--------------------------- Active slave change ---------------------------*/
 901
 902 /*
 903  * Update the mc list and multicast-related flags for the new and
 904  * old active slaves (if any) according to the multicast mode, and
 905  * promiscuous flags unconditionally.
 906  */
 907 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
 908                          struct slave *old_active)
 909 {
 910         struct netdev_hw_addr *ha;
 911
 912         if (!USES_PRIMARY(bond->params.mode))
 913                 /* nothing to do -  mc list is already up-to-date on
 914                  * all slaves
 915                  */
 916                 return;
 917
 918         if (old_active) {
 919                 if (bond->dev->flags & IFF_PROMISC)
 920                         dev_set_promiscuity(old_active->dev, -1);
 921
 922                 if (bond->dev->flags & IFF_ALLMULTI)
 923                         dev_set_allmulti(old_active->dev, -1);
 924
 925                 netdev_for_each_mc_addr(ha, bond->dev)
 926                         dev_mc_del(old_active->dev, ha->addr);
 927         }
 928
 929         if (new_active) {
 930                 /* FIXME: Signal errors upstream. */
 931                 if (bond->dev->flags & IFF_PROMISC)
 932                         dev_set_promiscuity(new_active->dev, 1);
 933
 934                 if (bond->dev->flags & IFF_ALLMULTI)
 935                         dev_set_allmulti(new_active->dev, 1);
 936
 937                 netdev_for_each_mc_addr(ha, bond->dev)
 938                         dev_mc_add(new_active->dev, ha->addr);
 939         }
 940 }
 941
 942 /*
 943  * bond_do_fail_over_mac
 944  *
 945  * Perform special MAC address swapping for fail_over_mac settings
 946  *
 947  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 948  */
 949 static void bond_do_fail_over_mac(struct bonding *bond,
 950                                   struct slave *new_active,
 951                                   struct slave *old_active)
 952         __releases(&bond->curr_slave_lock)
 953         __releases(&bond->lock)
 954         __acquires(&bond->lock)
 955         __acquires(&bond->curr_slave_lock)
 956 {
 957         u8 tmp_mac[ETH_ALEN];
 958         struct sockaddr saddr;
 959         int rv;
 960
 961         switch (bond->params.fail_over_mac) {
 962         case BOND_FOM_ACTIVE:
 963                 if (new_active)
 964                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
 965                                new_active->dev->addr_len);
 966                 break;
 967         case BOND_FOM_FOLLOW:
 968                 /*
 969                  * if new_active && old_active, swap them
 970                  * if just old_active, do nothing (going to no active slave)
 971                  * if just new_active, set new_active to bond's MAC
 972                  */
 973                 if (!new_active)
 974                         return;
 975
 976                 write_unlock_bh(&bond->curr_slave_lock);
 977                 read_unlock(&bond->lock);
 978
 979                 if (old_active) {
 980                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
 981                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
 982                                ETH_ALEN);
 983                         saddr.sa_family = new_active->dev->type;
 984                 } else {
 985                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
 986                         saddr.sa_family = bond->dev->type;
 987                 }
 988
 989                 rv = dev_set_mac_address(new_active->dev, &saddr);
 990                 if (rv) {
 991                         pr_err("%s: Error %d setting MAC of slave %s\n",
 992                                bond->dev->name, -rv, new_active->dev->name);
 993                         goto out;
 994                 }
 995
 996                 if (!old_active)
 997                         goto out;
 998
 999                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1000                 saddr.sa_family = old_active->dev->type;
1001
1002                 rv = dev_set_mac_address(old_active->dev, &saddr);
1003                 if (rv)
1004                         pr_err("%s: Error %d setting MAC of slave %s\n",
1005                                bond->dev->name, -rv, new_active->dev->name);
1006 out:
1007                 read_lock(&bond->lock);
1008                 write_lock_bh(&bond->curr_slave_lock);
1009                 break;
1010         default:
1011                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
1012                        bond->dev->name, bond->params.fail_over_mac);
1013                 break;
1014         }
1015
1016 }
1017
1018 static bool bond_should_change_active(struct bonding *bond)
1019 {
1020         struct slave *prim = bond->primary_slave;
1021         struct slave *curr = bond->curr_active_slave;
1022
1023         if (!prim || !curr || curr->link != BOND_LINK_UP)
1024                 return true;
1025         if (bond->force_primary) {
1026                 bond->force_primary = false;
1027                 return true;
1028         }
1029         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
1030             (prim->speed < curr->speed ||
1031              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
1032                 return false;
1033         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
1034                 return false;
1035         return true;
1036 }
1037
1038 /**
1039  * find_best_interface - select the best available slave to be the active one
1040  * @bond: our bonding struct
1041  *
1042  * Warning: Caller must hold curr_slave_lock for writing.
1043  */
1044 static struct slave *bond_find_best_slave(struct bonding *bond)
1045 {
1046         struct slave *new_active, *old_active;
1047         struct slave *bestslave = NULL;
1048         int mintime = bond->params.updelay;
1049         int i;
1050
1051         new_active = bond->curr_active_slave;
1052
1053         if (!new_active) { /* there were no active slaves left */
1054                 if (bond->slave_cnt > 0)   /* found one slave */
1055                         new_active = bond->first_slave;
1056                 else
1057                         return NULL; /* still no slave, return NULL */
1058         }
1059
1060         if ((bond->primary_slave) &&
1061             bond->primary_slave->link == BOND_LINK_UP &&
1062             bond_should_change_active(bond)) {
1063                 new_active = bond->primary_slave;
1064         }
1065
1066         /* remember where to stop iterating over the slaves */
1067         old_active = new_active;
1068
1069         bond_for_each_slave_from(bond, new_active, i, old_active) {
1070                 if (new_active->link == BOND_LINK_UP) {
1071                         return new_active;
1072                 } else if (new_active->link == BOND_LINK_BACK &&
1073                            IS_UP(new_active->dev)) {
1074                         /* link up, but waiting for stabilization */
1075                         if (new_active->delay < mintime) {
1076                                 mintime = new_active->delay;
1077                                 bestslave = new_active;
1078                         }
1079                 }
1080         }
1081
1082         return bestslave;
1083 }
1084
1085 /**
1086  * change_active_interface - change the active slave into the specified one
1087  * @bond: our bonding struct
1088  * @new: the new slave to make the active one
1089  *
1090  * Set the new slave to the bond's settings and unset them on the old
1091  * curr_active_slave.
1092  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1093  *
1094  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1095  * because it is apparently the best available slave we have, even though its
1096  * updelay hasn't timed out yet.
1097  *
1098  * If new_active is not NULL, caller must hold bond->lock for read and
1099  * curr_slave_lock for write_bh.
1100  */
1101 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1102 {
1103         struct slave *old_active = bond->curr_active_slave;
1104
1105         if (old_active == new_active)
1106                 return;
1107
1108         if (new_active) {
1109                 new_active->jiffies = jiffies;
1110
1111                 if (new_active->link == BOND_LINK_BACK) {
1112                         if (USES_PRIMARY(bond->params.mode)) {
1113                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1114                                         bond->dev->name, new_active->dev->name,
1115                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
1116                         }
1117
1118                         new_active->delay = 0;
1119                         new_active->link = BOND_LINK_UP;
1120
1121                         if (bond->params.mode == BOND_MODE_8023AD)
1122                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1123
1124                         if (bond_is_lb(bond))
1125                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1126                 } else {
1127                         if (USES_PRIMARY(bond->params.mode)) {
1128                                 pr_info("%s: making interface %s the new active one.\n",
1129                                         bond->dev->name, new_active->dev->name);
1130                         }
1131                 }
1132         }
1133
1134         if (USES_PRIMARY(bond->params.mode))
1135                 bond_mc_swap(bond, new_active, old_active);
1136
1137         if (bond_is_lb(bond)) {
1138                 bond_alb_handle_active_change(bond, new_active);
1139                 if (old_active)
1140                         bond_set_slave_inactive_flags(old_active);
1141                 if (new_active)
1142                         bond_set_slave_active_flags(new_active);
1143         } else {
1144                 bond->curr_active_slave = new_active;
1145         }
1146
1147         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1148                 if (old_active)
1149                         bond_set_slave_inactive_flags(old_active);
1150
1151                 if (new_active) {
1152                         bond_set_slave_active_flags(new_active);
1153
1154                         if (bond->params.fail_over_mac)
1155                                 bond_do_fail_over_mac(bond, new_active,
1156                                                       old_active);
1157
1158                         write_unlock_bh(&bond->curr_slave_lock);
1159                         read_unlock(&bond->lock);
1160
1161                         netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1162
1163                         read_lock(&bond->lock);
1164                         write_lock_bh(&bond->curr_slave_lock);
1165                 }
1166         }
1167
1168         /* resend IGMP joins since active slave has changed or
1169          * all were sent on curr_active_slave */
1170         if (((USES_PRIMARY(bond->params.mode) && new_active) ||
1171              bond->params.mode == BOND_MODE_ROUNDROBIN) &&
1172             netif_running(bond->dev)) {
1173                 bond->igmp_retrans = bond->params.resend_igmp;
1174                 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1175         }
1176 }
1177
1178 /**
1179  * bond_select_active_slave - select a new active slave, if needed
1180  * @bond: our bonding struct
1181  *
1182  * This functions should be called when one of the following occurs:
1183  * - The old curr_active_slave has been released or lost its link.
1184  * - The primary_slave has got its link back.
1185  * - A slave has got its link back and there's no old curr_active_slave.
1186  *
1187  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1188  */
1189 void bond_select_active_slave(struct bonding *bond)
1190 {
1191         struct slave *best_slave;
1192         int rv;
1193
1194         best_slave = bond_find_best_slave(bond);
1195         if (best_slave != bond->curr_active_slave) {
1196                 bond_change_active_slave(bond, best_slave);
1197                 rv = bond_set_carrier(bond);
1198                 if (!rv)
1199                         return;
1200
1201                 if (netif_carrier_ok(bond->dev)) {
1202                         pr_info("%s: first active interface up!\n",
1203                                 bond->dev->name);
1204                 } else {
1205                         pr_info("%s: now running without any active interface !\n",
1206                                 bond->dev->name);
1207                 }
1208         }
1209 }
1210
1211 /*--------------------------- slave list handling ---------------------------*/
1212
1213 /*
1214  * This function attaches the slave to the end of list.
1215  *
1216  * bond->lock held for writing by caller.
1217  */
1218 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1219 {
1220         if (bond->first_slave == NULL) { /* attaching the first slave */
1221                 new_slave->next = new_slave;
1222                 new_slave->prev = new_slave;
1223                 bond->first_slave = new_slave;
1224         } else {
1225                 new_slave->next = bond->first_slave;
1226                 new_slave->prev = bond->first_slave->prev;
1227                 new_slave->next->prev = new_slave;
1228                 new_slave->prev->next = new_slave;
1229         }
1230
1231         bond->slave_cnt++;
1232 }
1233
1234 /*
1235  * This function detaches the slave from the list.
1236  * WARNING: no check is made to verify if the slave effectively
1237  * belongs to <bond>.
1238  * Nothing is freed on return, structures are just unchained.
1239  * If any slave pointer in bond was pointing to <slave>,
1240  * it should be changed by the calling function.
1241  *
1242  * bond->lock held for writing by caller.
1243  */
1244 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1245 {
1246         if (slave->next)
1247                 slave->next->prev = slave->prev;
1248
1249         if (slave->prev)
1250                 slave->prev->next = slave->next;
1251
1252         if (bond->first_slave == slave) { /* slave is the first slave */
1253                 if (bond->slave_cnt > 1) { /* there are more slave */
1254                         bond->first_slave = slave->next;
1255                 } else {
1256                         bond->first_slave = NULL; /* slave was the last one */
1257                 }
1258         }
1259
1260         slave->next = NULL;
1261         slave->prev = NULL;
1262         bond->slave_cnt--;
1263 }
1264
1265 #ifdef CONFIG_NET_POLL_CONTROLLER
1266 static inline int slave_enable_netpoll(struct slave *slave)
1267 {
1268         struct netpoll *np;
1269         int err = 0;
1270
1271         np = kzalloc(sizeof(*np), GFP_KERNEL);
1272         err = -ENOMEM;
1273         if (!np)
1274                 goto out;
1275
1276         np->dev = slave->dev;
1277         err = __netpoll_setup(np);
1278         if (err) {
1279                 kfree(np);
1280                 goto out;
1281         }
1282         slave->np = np;
1283 out:
1284         return err;
1285 }
1286 static inline void slave_disable_netpoll(struct slave *slave)
1287 {
1288         struct netpoll *np = slave->np;
1289
1290         if (!np)
1291                 return;
1292
1293         slave->np = NULL;
1294         synchronize_rcu_bh();
1295         __netpoll_cleanup(np);
1296         kfree(np);
1297 }
1298 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1299 {
1300         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1301                 return false;
1302         if (!slave_dev->netdev_ops->ndo_poll_controller)
1303                 return false;
1304         return true;
1305 }
1306
1307 static void bond_poll_controller(struct net_device *bond_dev)
1308 {
1309 }
1310
1311 static void __bond_netpoll_cleanup(struct bonding *bond)
1312 {
1313         struct slave *slave;
1314         int i;
1315
1316         bond_for_each_slave(bond, slave, i)
1317                 if (IS_UP(slave->dev))
1318                         slave_disable_netpoll(slave);
1319 }
1320 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1321 {
1322         struct bonding *bond = netdev_priv(bond_dev);
1323
1324         read_lock(&bond->lock);
1325         __bond_netpoll_cleanup(bond);
1326         read_unlock(&bond->lock);
1327 }
1328
1329 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1330 {
1331         struct bonding *bond = netdev_priv(dev);
1332         struct slave *slave;
1333         int i, err = 0;
1334
1335         read_lock(&bond->lock);
1336         bond_for_each_slave(bond, slave, i) {
1337                 err = slave_enable_netpoll(slave);
1338                 if (err) {
1339                         __bond_netpoll_cleanup(bond);
1340                         break;
1341                 }
1342         }
1343         read_unlock(&bond->lock);
1344         return err;
1345 }
1346
1347 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1348 {
1349         return bond->dev->npinfo;
1350 }
1351
1352 #else
1353 static inline int slave_enable_netpoll(struct slave *slave)
1354 {
1355         return 0;
1356 }
1357 static inline void slave_disable_netpoll(struct slave *slave)
1358 {
1359 }
1360 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1361 {
1362 }
1363 #endif
1364
1365 /*---------------------------------- IOCTL ----------------------------------*/
1366
1367 static int bond_sethwaddr(struct net_device *bond_dev,
1368                           struct net_device *slave_dev)
1369 {
1370         pr_debug("bond_dev=%p\n", bond_dev);
1371         pr_debug("slave_dev=%p\n", slave_dev);
1372         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1373         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1374         return 0;
1375 }
1376
1377 #define BOND_VLAN_FEATURES \
1378         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1379          NETIF_F_HW_VLAN_FILTER)
1380
1381 /*
1382  * Compute the common dev->feature set available to all slaves.  Some
1383  * feature bits are managed elsewhere, so preserve those feature bits
1384  * on the master device.
1385  */
1386 static int bond_compute_features(struct bonding *bond)
1387 {
1388         struct slave *slave;
1389         struct net_device *bond_dev = bond->dev;
1390         u32 features = bond_dev->features;
1391         u32 vlan_features = 0;
1392         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1393                                                 bond_dev->hard_header_len);
1394         int i;
1395
1396         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1397         features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_NOCACHE_COPY;
1398
1399         if (!bond->first_slave)
1400                 goto done;
1401
1402         features &= ~NETIF_F_ONE_FOR_ALL;
1403
1404         vlan_features = bond->first_slave->dev->vlan_features;
1405         bond_for_each_slave(bond, slave, i) {
1406                 features = netdev_increment_features(features,
1407                                                      slave->dev->features,
1408                                                      NETIF_F_ONE_FOR_ALL);
1409                 vlan_features = netdev_increment_features(vlan_features,
1410                                                         slave->dev->vlan_features,
1411                                                         NETIF_F_ONE_FOR_ALL);
1412                 if (slave->dev->hard_header_len > max_hard_header_len)
1413                         max_hard_header_len = slave->dev->hard_header_len;
1414         }
1415
1416 done:
1417         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1418         bond_dev->features = netdev_fix_features(bond_dev, features);
1419         bond_dev->vlan_features = netdev_fix_features(bond_dev, vlan_features);
1420         bond_dev->hard_header_len = max_hard_header_len;
1421
1422         return 0;
1423 }
1424
1425 static void bond_setup_by_slave(struct net_device *bond_dev,
1426                                 struct net_device *slave_dev)
1427 {
1428         struct bonding *bond = netdev_priv(bond_dev);
1429
1430         bond_dev->header_ops        = slave_dev->header_ops;
1431
1432         bond_dev->type              = slave_dev->type;
1433         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1434         bond_dev->addr_len          = slave_dev->addr_len;
1435
1436         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1437                 slave_dev->addr_len);
1438         bond->setup_by_slave = 1;
1439 }
1440
1441 /* On bonding slaves other than the currently active slave, suppress
1442  * duplicates except for alb non-mcast/bcast.
1443  */
1444 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1445                                             struct slave *slave,
1446                                             struct bonding *bond)
1447 {
1448         if (bond_is_slave_inactive(slave)) {
1449                 if (bond->params.mode == BOND_MODE_ALB &&
1450                     skb->pkt_type != PACKET_BROADCAST &&
1451                     skb->pkt_type != PACKET_MULTICAST)
1452                         return false;
1453                 return true;
1454         }
1455         return false;
1456 }
1457
1458 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1459 {
1460         struct sk_buff *skb = *pskb;
1461         struct slave *slave;
1462         struct bonding *bond;
1463
1464         skb = skb_share_check(skb, GFP_ATOMIC);
1465         if (unlikely(!skb))
1466                 return RX_HANDLER_CONSUMED;
1467
1468         *pskb = skb;
1469
1470         slave = bond_slave_get_rcu(skb->dev);
1471         bond = slave->bond;
1472
1473         if (bond->params.arp_interval)
1474                 slave->dev->last_rx = jiffies;
1475
1476         if (bond->recv_probe) {
1477                 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
1478
1479                 if (likely(nskb)) {
1480                         bond->recv_probe(nskb, bond, slave);
1481                         dev_kfree_skb(nskb);
1482                 }
1483         }
1484
1485         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1486                 return RX_HANDLER_EXACT;
1487         }
1488
1489         skb->dev = bond->dev;
1490
1491         if (bond->params.mode == BOND_MODE_ALB &&
1492             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1493             skb->pkt_type == PACKET_HOST) {
1494
1495                 if (unlikely(skb_cow_head(skb,
1496                                           skb->data - skb_mac_header(skb)))) {
1497                         kfree_skb(skb);
1498                         return RX_HANDLER_CONSUMED;
1499                 }
1500                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1501         }
1502
1503         return RX_HANDLER_ANOTHER;
1504 }
1505
1506 /* enslave device <slave> to bond device <master> */
1507 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1508 {
1509         struct bonding *bond = netdev_priv(bond_dev);
1510         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1511         struct slave *new_slave = NULL;
1512         struct netdev_hw_addr *ha;
1513         struct sockaddr addr;
1514         int link_reporting;
1515         int old_features = bond_dev->features;
1516         int res = 0;
1517
1518         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1519                 slave_ops->ndo_do_ioctl == NULL) {
1520                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1521                            bond_dev->name, slave_dev->name);
1522         }
1523
1524         /* bond must be initialized by bond_open() before enslaving */
1525         if (!(bond_dev->flags & IFF_UP)) {
1526                 pr_warning("%s: master_dev is not up in bond_enslave\n",
1527                            bond_dev->name);
1528         }
1529
1530         /* already enslaved */
1531         if (slave_dev->flags & IFF_SLAVE) {
1532                 pr_debug("Error, Device was already enslaved\n");
1533                 return -EBUSY;
1534         }
1535
1536         /* vlan challenged mutual exclusion */
1537         /* no need to lock since we're protected by rtnl_lock */
1538         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1539                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1540                 if (bond->vlgrp) {
1541                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1542                                bond_dev->name, slave_dev->name, bond_dev->name);
1543                         return -EPERM;
1544                 } else {
1545                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1546                                    bond_dev->name, slave_dev->name,
1547                                    slave_dev->name, bond_dev->name);
1548                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1549                 }
1550         } else {
1551                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1552                 if (bond->slave_cnt == 0) {
1553                         /* First slave, and it is not VLAN challenged,
1554                          * so remove the block of adding VLANs over the bond.
1555                          */
1556                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1557                 }
1558         }
1559
1560         /*
1561          * Old ifenslave binaries are no longer supported.  These can
1562          * be identified with moderate accuracy by the state of the slave:
1563          * the current ifenslave will set the interface down prior to
1564          * enslaving it; the old ifenslave will not.
1565          */
1566         if ((slave_dev->flags & IFF_UP)) {
1567                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1568                        slave_dev->name);
1569                 res = -EPERM;
1570                 goto err_undo_flags;
1571         }
1572
1573         /* set bonding device ether type by slave - bonding netdevices are
1574          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1575          * there is a need to override some of the type dependent attribs/funcs.
1576          *
1577          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1578          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1579          */
1580         if (bond->slave_cnt == 0) {
1581                 if (bond_dev->type != slave_dev->type) {
1582                         pr_debug("%s: change device type from %d to %d\n",
1583                                  bond_dev->name,
1584                                  bond_dev->type, slave_dev->type);
1585
1586                         res = netdev_bonding_change(bond_dev,
1587                                                     NETDEV_PRE_TYPE_CHANGE);
1588                         res = notifier_to_errno(res);
1589                         if (res) {
1590                                 pr_err("%s: refused to change device type\n",
1591                                        bond_dev->name);
1592                                 res = -EBUSY;
1593                                 goto err_undo_flags;
1594                         }
1595
1596                         /* Flush unicast and multicast addresses */
1597                         dev_uc_flush(bond_dev);
1598                         dev_mc_flush(bond_dev);
1599
1600                         if (slave_dev->type != ARPHRD_ETHER)
1601                                 bond_setup_by_slave(bond_dev, slave_dev);
1602                         else
1603                                 ether_setup(bond_dev);
1604
1605                         netdev_bonding_change(bond_dev,
1606                                               NETDEV_POST_TYPE_CHANGE);
1607                 }
1608         } else if (bond_dev->type != slave_dev->type) {
1609                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1610                        slave_dev->name,
1611                        slave_dev->type, bond_dev->type);
1612                 res = -EINVAL;
1613                 goto err_undo_flags;
1614         }
1615
1616         if (slave_ops->ndo_set_mac_address == NULL) {
1617                 if (bond->slave_cnt == 0) {
1618                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1619                                    bond_dev->name);
1620                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1621                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1622                         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",
1623                                bond_dev->name);
1624                         res = -EOPNOTSUPP;
1625                         goto err_undo_flags;
1626                 }
1627         }
1628
1629         /* If this is the first slave, then we need to set the master's hardware
1630          * address to be the same as the slave's. */
1631         if (is_zero_ether_addr(bond->dev->dev_addr))
1632                 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1633                        slave_dev->addr_len);
1634
1635
1636         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1637         if (!new_slave) {
1638                 res = -ENOMEM;
1639                 goto err_undo_flags;
1640         }
1641
1642         /*
1643          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1644          * is set via sysfs or module option if desired.
1645          */
1646         new_slave->queue_id = 0;
1647
1648         /* Save slave's original mtu and then set it to match the bond */
1649         new_slave->original_mtu = slave_dev->mtu;
1650         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1651         if (res) {
1652                 pr_debug("Error %d calling dev_set_mtu\n", res);
1653                 goto err_free;
1654         }
1655
1656         /*
1657          * Save slave's original ("permanent") mac address for modes
1658          * that need it, and for restoring it upon release, and then
1659          * set it to the master's address
1660          */
1661         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1662
1663         if (!bond->params.fail_over_mac) {
1664                 /*
1665                  * Set slave to master's mac address.  The application already
1666                  * set the master's mac address to that of the first slave
1667                  */
1668                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1669                 addr.sa_family = slave_dev->type;
1670                 res = dev_set_mac_address(slave_dev, &addr);
1671                 if (res) {
1672                         pr_debug("Error %d calling set_mac_address\n", res);
1673                         goto err_restore_mtu;
1674                 }
1675         }
1676
1677         res = netdev_set_bond_master(slave_dev, bond_dev);
1678         if (res) {
1679                 pr_debug("Error %d calling netdev_set_bond_master\n", res);
1680                 goto err_restore_mac;
1681         }
1682
1683         /* open the slave since the application closed it */
1684         res = dev_open(slave_dev);
1685         if (res) {
1686                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1687                 goto err_unset_master;
1688         }
1689
1690         new_slave->bond = bond;
1691         new_slave->dev = slave_dev;
1692         slave_dev->priv_flags |= IFF_BONDING;
1693
1694         if (bond_is_lb(bond)) {
1695                 /* bond_alb_init_slave() must be called before all other stages since
1696                  * it might fail and we do not want to have to undo everything
1697                  */
1698                 res = bond_alb_init_slave(bond, new_slave);
1699                 if (res)
1700                         goto err_close;
1701         }
1702
1703         /* If the mode USES_PRIMARY, then the new slave gets the
1704          * master's promisc (and mc) settings only if it becomes the
1705          * curr_active_slave, and that is taken care of later when calling
1706          * bond_change_active()
1707          */
1708         if (!USES_PRIMARY(bond->params.mode)) {
1709                 /* set promiscuity level to new slave */
1710                 if (bond_dev->flags & IFF_PROMISC) {
1711                         res = dev_set_promiscuity(slave_dev, 1);
1712                         if (res)
1713                                 goto err_close;
1714                 }
1715
1716                 /* set allmulti level to new slave */
1717                 if (bond_dev->flags & IFF_ALLMULTI) {
1718                         res = dev_set_allmulti(slave_dev, 1);
1719                         if (res)
1720                                 goto err_close;
1721                 }
1722
1723                 netif_addr_lock_bh(bond_dev);
1724                 /* upload master's mc_list to new slave */
1725                 netdev_for_each_mc_addr(ha, bond_dev)
1726                         dev_mc_add(slave_dev, ha->addr);
1727                 netif_addr_unlock_bh(bond_dev);
1728         }
1729
1730         if (bond->params.mode == BOND_MODE_8023AD) {
1731                 /* add lacpdu mc addr to mc list */
1732                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1733
1734                 dev_mc_add(slave_dev, lacpdu_multicast);
1735         }
1736
1737         bond_add_vlans_on_slave(bond, slave_dev);
1738
1739         write_lock_bh(&bond->lock);
1740
1741         bond_attach_slave(bond, new_slave);
1742
1743         new_slave->delay = 0;
1744         new_slave->link_failure_count = 0;
1745
1746         bond_compute_features(bond);
1747
1748         write_unlock_bh(&bond->lock);
1749
1750         read_lock(&bond->lock);
1751
1752         new_slave->last_arp_rx = jiffies;
1753
1754         if (bond->params.miimon && !bond->params.use_carrier) {
1755                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1756
1757                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1758                         /*
1759                          * miimon is set but a bonded network driver
1760                          * does not support ETHTOOL/MII and
1761                          * arp_interval is not set.  Note: if
1762                          * use_carrier is enabled, we will never go
1763                          * here (because netif_carrier is always
1764                          * supported); thus, we don't need to change
1765                          * the messages for netif_carrier.
1766                          */
1767                         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",
1768                                bond_dev->name, slave_dev->name);
1769                 } else if (link_reporting == -1) {
1770                         /* unable get link status using mii/ethtool */
1771                         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",
1772                                    bond_dev->name, slave_dev->name);
1773                 }
1774         }
1775
1776         /* check for initial state */
1777         if (!bond->params.miimon ||
1778             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1779                 if (bond->params.updelay) {
1780                         pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1781                         new_slave->link  = BOND_LINK_BACK;
1782                         new_slave->delay = bond->params.updelay;
1783                 } else {
1784                         pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1785                         new_slave->link  = BOND_LINK_UP;
1786                 }
1787                 new_slave->jiffies = jiffies;
1788         } else {
1789                 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1790                 new_slave->link  = BOND_LINK_DOWN;
1791         }
1792
1793         if (bond_update_speed_duplex(new_slave) &&
1794             (new_slave->link != BOND_LINK_DOWN)) {
1795                 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n",
1796                            bond_dev->name, new_slave->dev->name);
1797
1798                 if (bond->params.mode == BOND_MODE_8023AD) {
1799                         pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n",
1800                                    bond_dev->name);
1801                 }
1802         }
1803
1804         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1805                 /* if there is a primary slave, remember it */
1806                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1807                         bond->primary_slave = new_slave;
1808                         bond->force_primary = true;
1809                 }
1810         }
1811
1812         write_lock_bh(&bond->curr_slave_lock);
1813
1814         switch (bond->params.mode) {
1815         case BOND_MODE_ACTIVEBACKUP:
1816                 bond_set_slave_inactive_flags(new_slave);
1817                 bond_select_active_slave(bond);
1818                 break;
1819         case BOND_MODE_8023AD:
1820                 /* in 802.3ad mode, the internal mechanism
1821                  * will activate the slaves in the selected
1822                  * aggregator
1823                  */
1824                 bond_set_slave_inactive_flags(new_slave);
1825                 /* if this is the first slave */
1826                 if (bond->slave_cnt == 1) {
1827                         SLAVE_AD_INFO(new_slave).id = 1;
1828                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1829                          * can be called only after the mac address of the bond is set
1830                          */
1831                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1832                                             bond->params.lacp_fast);
1833                 } else {
1834                         SLAVE_AD_INFO(new_slave).id =
1835                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1836                 }
1837
1838                 bond_3ad_bind_slave(new_slave);
1839                 break;
1840         case BOND_MODE_TLB:
1841         case BOND_MODE_ALB:
1842                 bond_set_active_slave(new_slave);
1843                 bond_set_slave_inactive_flags(new_slave);
1844                 bond_select_active_slave(bond);
1845                 break;
1846         default:
1847                 pr_debug("This slave is always active in trunk mode\n");
1848
1849                 /* always active in trunk mode */
1850                 bond_set_active_slave(new_slave);
1851
1852                 /* In trunking mode there is little meaning to curr_active_slave
1853                  * anyway (it holds no special properties of the bond device),
1854                  * so we can change it without calling change_active_interface()
1855                  */
1856                 if (!bond->curr_active_slave)
1857                         bond->curr_active_slave = new_slave;
1858
1859                 break;
1860         } /* switch(bond_mode) */
1861
1862         write_unlock_bh(&bond->curr_slave_lock);
1863
1864         bond_set_carrier(bond);
1865
1866 #ifdef CONFIG_NET_POLL_CONTROLLER
1867         slave_dev->npinfo = bond_netpoll_info(bond);
1868         if (slave_dev->npinfo) {
1869                 if (slave_enable_netpoll(new_slave)) {
1870                         read_unlock(&bond->lock);
1871                         pr_info("Error, %s: master_dev is using netpoll, "
1872                                  "but new slave device does not support netpoll.\n",
1873                                  bond_dev->name);
1874                         res = -EBUSY;
1875                         goto err_close;
1876                 }
1877         }
1878 #endif
1879
1880         read_unlock(&bond->lock);
1881
1882         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1883         if (res)
1884                 goto err_close;
1885
1886         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1887                                          new_slave);
1888         if (res) {
1889                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1890                 goto err_dest_symlinks;
1891         }
1892
1893         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1894                 bond_dev->name, slave_dev->name,
1895                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1896                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1897
1898         /* enslave is successful */
1899         return 0;
1900
1901 /* Undo stages on error */
1902 err_dest_symlinks:
1903         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1904
1905 err_close:
1906         dev_close(slave_dev);
1907
1908 err_unset_master:
1909         netdev_set_bond_master(slave_dev, NULL);
1910
1911 err_restore_mac:
1912         if (!bond->params.fail_over_mac) {
1913                 /* XXX TODO - fom follow mode needs to change master's
1914                  * MAC if this slave's MAC is in use by the bond, or at
1915                  * least print a warning.
1916                  */
1917                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1918                 addr.sa_family = slave_dev->type;
1919                 dev_set_mac_address(slave_dev, &addr);
1920         }
1921
1922 err_restore_mtu:
1923         dev_set_mtu(slave_dev, new_slave->original_mtu);
1924
1925 err_free:
1926         kfree(new_slave);
1927
1928 err_undo_flags:
1929         bond_dev->features = old_features;
1930
1931         return res;
1932 }
1933
1934 /*
1935  * Try to release the slave device <slave> from the bond device <master>
1936  * It is legal to access curr_active_slave without a lock because all the function
1937  * is write-locked.
1938  *
1939  * The rules for slave state should be:
1940  *   for Active/Backup:
1941  *     Active stays on all backups go down
1942  *   for Bonded connections:
1943  *     The first up interface should be left on and all others downed.
1944  */
1945 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1946 {
1947         struct bonding *bond = netdev_priv(bond_dev);
1948         struct slave *slave, *oldcurrent;
1949         struct sockaddr addr;
1950
1951         /* slave is not a slave or master is not master of this slave */
1952         if (!(slave_dev->flags & IFF_SLAVE) ||
1953             (slave_dev->master != bond_dev)) {
1954                 pr_err("%s: Error: cannot release %s.\n",
1955                        bond_dev->name, slave_dev->name);
1956                 return -EINVAL;
1957         }
1958
1959         block_netpoll_tx();
1960         netdev_bonding_change(bond_dev, NETDEV_BONDING_DESLAVE);
1961         write_lock_bh(&bond->lock);
1962
1963         slave = bond_get_slave_by_dev(bond, slave_dev);
1964         if (!slave) {
1965                 /* not a slave of this bond */
1966                 pr_info("%s: %s not enslaved\n",
1967                         bond_dev->name, slave_dev->name);
1968                 write_unlock_bh(&bond->lock);
1969                 unblock_netpoll_tx();
1970                 return -EINVAL;
1971         }
1972
1973         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1974          * for this slave anymore.
1975          */
1976         netdev_rx_handler_unregister(slave_dev);
1977         write_unlock_bh(&bond->lock);
1978         synchronize_net();
1979         write_lock_bh(&bond->lock);
1980
1981         if (!bond->params.fail_over_mac) {
1982                 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1983                     bond->slave_cnt > 1)
1984                         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",
1985                                    bond_dev->name, slave_dev->name,
1986                                    slave->perm_hwaddr,
1987                                    bond_dev->name, slave_dev->name);
1988         }
1989
1990         /* Inform AD package of unbinding of slave. */
1991         if (bond->params.mode == BOND_MODE_8023AD) {
1992                 /* must be called before the slave is
1993                  * detached from the list
1994                  */
1995                 bond_3ad_unbind_slave(slave);
1996         }
1997
1998         pr_info("%s: releasing %s interface %s\n",
1999                 bond_dev->name,
2000                 bond_is_active_slave(slave) ? "active" : "backup",
2001                 slave_dev->name);
2002
2003         oldcurrent = bond->curr_active_slave;
2004
2005         bond->current_arp_slave = NULL;
2006
2007         /* release the slave from its bond */
2008         bond_detach_slave(bond, slave);
2009
2010         bond_compute_features(bond);
2011
2012         if (bond->primary_slave == slave)
2013                 bond->primary_slave = NULL;
2014
2015         if (oldcurrent == slave)
2016                 bond_change_active_slave(bond, NULL);
2017
2018         if (bond_is_lb(bond)) {
2019                 /* Must be called only after the slave has been
2020                  * detached from the list and the curr_active_slave
2021                  * has been cleared (if our_slave == old_current),
2022                  * but before a new active slave is selected.
2023                  */
2024                 write_unlock_bh(&bond->lock);
2025                 bond_alb_deinit_slave(bond, slave);
2026                 write_lock_bh(&bond->lock);
2027         }
2028
2029         if (oldcurrent == slave) {
2030                 /*
2031                  * Note that we hold RTNL over this sequence, so there
2032                  * is no concern that another slave add/remove event
2033                  * will interfere.
2034                  */
2035                 write_unlock_bh(&bond->lock);
2036                 read_lock(&bond->lock);
2037                 write_lock_bh(&bond->curr_slave_lock);
2038
2039                 bond_select_active_slave(bond);
2040
2041                 write_unlock_bh(&bond->curr_slave_lock);
2042                 read_unlock(&bond->lock);
2043                 write_lock_bh(&bond->lock);
2044         }
2045
2046         if (bond->slave_cnt == 0) {
2047                 bond_set_carrier(bond);
2048
2049                 /* if the last slave was removed, zero the mac address
2050                  * of the master so it will be set by the application
2051                  * to the mac address of the first slave
2052                  */
2053                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2054
2055                 if (!bond->vlgrp) {
2056                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2057                 } else {
2058                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2059                                    bond_dev->name, bond_dev->name);
2060                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2061                                    bond_dev->name);
2062                 }
2063         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2064                    !bond_has_challenged_slaves(bond)) {
2065                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2066                         bond_dev->name, slave_dev->name, bond_dev->name);
2067                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
2068         }
2069
2070         write_unlock_bh(&bond->lock);
2071         unblock_netpoll_tx();
2072
2073         /* must do this from outside any spinlocks */
2074         bond_destroy_slave_symlinks(bond_dev, slave_dev);
2075
2076         bond_del_vlans_from_slave(bond, slave_dev);
2077
2078         /* If the mode USES_PRIMARY, then we should only remove its
2079          * promisc and mc settings if it was the curr_active_slave, but that was
2080          * already taken care of above when we detached the slave
2081          */
2082         if (!USES_PRIMARY(bond->params.mode)) {
2083                 /* unset promiscuity level from slave */
2084                 if (bond_dev->flags & IFF_PROMISC)
2085                         dev_set_promiscuity(slave_dev, -1);
2086
2087                 /* unset allmulti level from slave */
2088                 if (bond_dev->flags & IFF_ALLMULTI)
2089                         dev_set_allmulti(slave_dev, -1);
2090
2091                 /* flush master's mc_list from slave */
2092                 netif_addr_lock_bh(bond_dev);
2093                 bond_mc_list_flush(bond_dev, slave_dev);
2094                 netif_addr_unlock_bh(bond_dev);
2095         }
2096
2097         netdev_set_bond_master(slave_dev, NULL);
2098
2099         slave_disable_netpoll(slave);
2100
2101         /* close slave before restoring its mac address */
2102         dev_close(slave_dev);
2103
2104         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2105                 /* restore original ("permanent") mac address */
2106                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2107                 addr.sa_family = slave_dev->type;
2108                 dev_set_mac_address(slave_dev, &addr);
2109         }
2110
2111         dev_set_mtu(slave_dev, slave->original_mtu);
2112
2113         slave_dev->priv_flags &= ~IFF_BONDING;
2114
2115         kfree(slave);
2116
2117         return 0;  /* deletion OK */
2118 }
2119
2120 /*
2121 * First release a slave and then destroy the bond if no more slaves are left.
2122 * Must be under rtnl_lock when this function is called.
2123 */
2124 static int  bond_release_and_destroy(struct net_device *bond_dev,
2125                                      struct net_device *slave_dev)
2126 {
2127         struct bonding *bond = netdev_priv(bond_dev);
2128         int ret;
2129
2130         ret = bond_release(bond_dev, slave_dev);
2131         if ((ret == 0) && (bond->slave_cnt == 0)) {
2132                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2133                 pr_info("%s: destroying bond %s.\n",
2134                         bond_dev->name, bond_dev->name);
2135                 unregister_netdevice(bond_dev);
2136         }
2137         return ret;
2138 }
2139
2140 /*
2141  * This function releases all slaves.
2142  */
2143 static int bond_release_all(struct net_device *bond_dev)
2144 {
2145         struct bonding *bond = netdev_priv(bond_dev);
2146         struct slave *slave;
2147         struct net_device *slave_dev;
2148         struct sockaddr addr;
2149
2150         write_lock_bh(&bond->lock);
2151
2152         netif_carrier_off(bond_dev);
2153
2154         if (bond->slave_cnt == 0)
2155                 goto out;
2156
2157         bond->current_arp_slave = NULL;
2158         bond->primary_slave = NULL;
2159         bond_change_active_slave(bond, NULL);
2160
2161         while ((slave = bond->first_slave) != NULL) {
2162                 /* Inform AD package of unbinding of slave
2163                  * before slave is detached from the list.
2164                  */
2165                 if (bond->params.mode == BOND_MODE_8023AD)
2166                         bond_3ad_unbind_slave(slave);
2167
2168                 slave_dev = slave->dev;
2169                 bond_detach_slave(bond, slave);
2170
2171                 /* now that the slave is detached, unlock and perform
2172                  * all the undo steps that should not be called from
2173                  * within a lock.
2174                  */
2175                 write_unlock_bh(&bond->lock);
2176
2177                 /* unregister rx_handler early so bond_handle_frame wouldn't
2178                  * be called for this slave anymore.
2179                  */
2180                 netdev_rx_handler_unregister(slave_dev);
2181                 synchronize_net();
2182
2183                 if (bond_is_lb(bond)) {
2184                         /* must be called only after the slave
2185                          * has been detached from the list
2186                          */
2187                         bond_alb_deinit_slave(bond, slave);
2188                 }
2189
2190                 bond_compute_features(bond);
2191
2192                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2193                 bond_del_vlans_from_slave(bond, slave_dev);
2194
2195                 /* If the mode USES_PRIMARY, then we should only remove its
2196                  * promisc and mc settings if it was the curr_active_slave, but that was
2197                  * already taken care of above when we detached the slave
2198                  */
2199                 if (!USES_PRIMARY(bond->params.mode)) {
2200                         /* unset promiscuity level from slave */
2201                         if (bond_dev->flags & IFF_PROMISC)
2202                                 dev_set_promiscuity(slave_dev, -1);
2203
2204                         /* unset allmulti level from slave */
2205                         if (bond_dev->flags & IFF_ALLMULTI)
2206                                 dev_set_allmulti(slave_dev, -1);
2207
2208                         /* flush master's mc_list from slave */
2209                         netif_addr_lock_bh(bond_dev);
2210                         bond_mc_list_flush(bond_dev, slave_dev);
2211                         netif_addr_unlock_bh(bond_dev);
2212                 }
2213
2214                 netdev_set_bond_master(slave_dev, NULL);
2215
2216                 slave_disable_netpoll(slave);
2217
2218                 /* close slave before restoring its mac address */
2219                 dev_close(slave_dev);
2220
2221                 if (!bond->params.fail_over_mac) {
2222                         /* restore original ("permanent") mac address*/
2223                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2224                         addr.sa_family = slave_dev->type;
2225                         dev_set_mac_address(slave_dev, &addr);
2226                 }
2227
2228                 kfree(slave);
2229
2230                 /* re-acquire the lock before getting the next slave */
2231                 write_lock_bh(&bond->lock);
2232         }
2233
2234         /* zero the mac address of the master so it will be
2235          * set by the application to the mac address of the
2236          * first slave
2237          */
2238         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2239
2240         if (!bond->vlgrp) {
2241                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2242         } else {
2243                 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2244                            bond_dev->name, bond_dev->name);
2245                 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2246                            bond_dev->name);
2247         }
2248
2249         pr_info("%s: released all slaves\n", bond_dev->name);
2250
2251 out:
2252         write_unlock_bh(&bond->lock);
2253         return 0;
2254 }
2255
2256 /*
2257  * This function changes the active slave to slave <slave_dev>.
2258  * It returns -EINVAL in the following cases.
2259  *  - <slave_dev> is not found in the list.
2260  *  - There is not active slave now.
2261  *  - <slave_dev> is already active.
2262  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2263  *  - <slave_dev> is not running.
2264  * In these cases, this function does nothing.
2265  * In the other cases, current_slave pointer is changed and 0 is returned.
2266  */
2267 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2268 {
2269         struct bonding *bond = netdev_priv(bond_dev);
2270         struct slave *old_active = NULL;
2271         struct slave *new_active = NULL;
2272         int res = 0;
2273
2274         if (!USES_PRIMARY(bond->params.mode))
2275                 return -EINVAL;
2276
2277         /* Verify that master_dev is indeed the master of slave_dev */
2278         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2279                 return -EINVAL;
2280
2281         read_lock(&bond->lock);
2282
2283         read_lock(&bond->curr_slave_lock);
2284         old_active = bond->curr_active_slave;
2285         read_unlock(&bond->curr_slave_lock);
2286
2287         new_active = bond_get_slave_by_dev(bond, slave_dev);
2288
2289         /*
2290          * Changing to the current active: do nothing; return success.
2291          */
2292         if (new_active && (new_active == old_active)) {
2293                 read_unlock(&bond->lock);
2294                 return 0;
2295         }
2296
2297         if ((new_active) &&
2298             (old_active) &&
2299             (new_active->link == BOND_LINK_UP) &&
2300             IS_UP(new_active->dev)) {
2301                 block_netpoll_tx();
2302                 write_lock_bh(&bond->curr_slave_lock);
2303                 bond_change_active_slave(bond, new_active);
2304                 write_unlock_bh(&bond->curr_slave_lock);
2305                 unblock_netpoll_tx();
2306         } else
2307                 res = -EINVAL;
2308
2309         read_unlock(&bond->lock);
2310
2311         return res;
2312 }
2313
2314 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2315 {
2316         struct bonding *bond = netdev_priv(bond_dev);
2317
2318         info->bond_mode = bond->params.mode;
2319         info->miimon = bond->params.miimon;
2320
2321         read_lock(&bond->lock);
2322         info->num_slaves = bond->slave_cnt;
2323         read_unlock(&bond->lock);
2324
2325         return 0;
2326 }
2327
2328 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2329 {
2330         struct bonding *bond = netdev_priv(bond_dev);
2331         struct slave *slave;
2332         int i, res = -ENODEV;
2333
2334         read_lock(&bond->lock);
2335
2336         bond_for_each_slave(bond, slave, i) {
2337                 if (i == (int)info->slave_id) {
2338                         res = 0;
2339                         strcpy(info->slave_name, slave->dev->name);
2340                         info->link = slave->link;
2341                         info->state = bond_slave_state(slave);
2342                         info->link_failure_count = slave->link_failure_count;
2343                         break;
2344                 }
2345         }
2346
2347         read_unlock(&bond->lock);
2348
2349         return res;
2350 }
2351
2352 /*-------------------------------- Monitoring -------------------------------*/
2353
2354
2355 static int bond_miimon_inspect(struct bonding *bond)
2356 {
2357         struct slave *slave;
2358         int i, link_state, commit = 0;
2359         bool ignore_updelay;
2360
2361         ignore_updelay = !bond->curr_active_slave ? true : false;
2362
2363         bond_for_each_slave(bond, slave, i) {
2364                 slave->new_link = BOND_LINK_NOCHANGE;
2365
2366                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2367
2368                 switch (slave->link) {
2369                 case BOND_LINK_UP:
2370                         if (link_state)
2371                                 continue;
2372
2373                         slave->link = BOND_LINK_FAIL;
2374                         slave->delay = bond->params.downdelay;
2375                         if (slave->delay) {
2376                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2377                                         bond->dev->name,
2378                                         (bond->params.mode ==
2379                                          BOND_MODE_ACTIVEBACKUP) ?
2380                                         (bond_is_active_slave(slave) ?
2381                                          "active " : "backup ") : "",
2382                                         slave->dev->name,
2383                                         bond->params.downdelay * bond->params.miimon);
2384                         }
2385                         /*FALLTHRU*/
2386                 case BOND_LINK_FAIL:
2387                         if (link_state) {
2388                                 /*
2389                                  * recovered before downdelay expired
2390                                  */
2391                                 slave->link = BOND_LINK_UP;
2392                                 slave->jiffies = jiffies;
2393                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2394                                         bond->dev->name,
2395                                         (bond->params.downdelay - slave->delay) *
2396                                         bond->params.miimon,
2397                                         slave->dev->name);
2398                                 continue;
2399                         }
2400
2401                         if (slave->delay <= 0) {
2402                                 slave->new_link = BOND_LINK_DOWN;
2403                                 commit++;
2404                                 continue;
2405                         }
2406
2407                         slave->delay--;
2408                         break;
2409
2410                 case BOND_LINK_DOWN:
2411                         if (!link_state)
2412                                 continue;
2413
2414                         slave->link = BOND_LINK_BACK;
2415                         slave->delay = bond->params.updelay;
2416
2417                         if (slave->delay) {
2418                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2419                                         bond->dev->name, slave->dev->name,
2420                                         ignore_updelay ? 0 :
2421                                         bond->params.updelay *
2422                                         bond->params.miimon);
2423                         }
2424                         /*FALLTHRU*/
2425                 case BOND_LINK_BACK:
2426                         if (!link_state) {
2427                                 slave->link = BOND_LINK_DOWN;
2428                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2429                                         bond->dev->name,
2430                                         (bond->params.updelay - slave->delay) *
2431                                         bond->params.miimon,
2432                                         slave->dev->name);
2433
2434                                 continue;
2435                         }
2436
2437                         if (ignore_updelay)
2438                                 slave->delay = 0;
2439
2440                         if (slave->delay <= 0) {
2441                                 slave->new_link = BOND_LINK_UP;
2442                                 commit++;
2443                                 ignore_updelay = false;
2444                                 continue;
2445                         }
2446
2447                         slave->delay--;
2448                         break;
2449                 }
2450         }
2451
2452         return commit;
2453 }
2454
2455 static void bond_miimon_commit(struct bonding *bond)
2456 {
2457         struct slave *slave;
2458         int i;
2459
2460         bond_for_each_slave(bond, slave, i) {
2461                 switch (slave->new_link) {
2462                 case BOND_LINK_NOCHANGE:
2463                         continue;
2464
2465                 case BOND_LINK_UP:
2466                         slave->link = BOND_LINK_UP;
2467                         slave->jiffies = jiffies;
2468
2469                         if (bond->params.mode == BOND_MODE_8023AD) {
2470                                 /* prevent it from being the active one */
2471                                 bond_set_backup_slave(slave);
2472                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2473                                 /* make it immediately active */
2474                                 bond_set_active_slave(slave);
2475                         } else if (slave != bond->primary_slave) {
2476                                 /* prevent it from being the active one */
2477                                 bond_set_backup_slave(slave);
2478                         }
2479
2480                         bond_update_speed_duplex(slave);
2481
2482                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2483                                 bond->dev->name, slave->dev->name,
2484                                 slave->speed, slave->duplex ? "full" : "half");
2485
2486                         /* notify ad that the link status has changed */
2487                         if (bond->params.mode == BOND_MODE_8023AD)
2488                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2489
2490                         if (bond_is_lb(bond))
2491                                 bond_alb_handle_link_change(bond, slave,
2492                                                             BOND_LINK_UP);
2493
2494                         if (!bond->curr_active_slave ||
2495                             (slave == bond->primary_slave))
2496                                 goto do_failover;
2497
2498                         continue;
2499
2500                 case BOND_LINK_DOWN:
2501                         if (slave->link_failure_count < UINT_MAX)
2502                                 slave->link_failure_count++;
2503
2504                         slave->link = BOND_LINK_DOWN;
2505
2506                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2507                             bond->params.mode == BOND_MODE_8023AD)
2508                                 bond_set_slave_inactive_flags(slave);
2509
2510                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2511                                 bond->dev->name, slave->dev->name);
2512
2513                         if (bond->params.mode == BOND_MODE_8023AD)
2514                                 bond_3ad_handle_link_change(slave,
2515                                                             BOND_LINK_DOWN);
2516
2517                         if (bond_is_lb(bond))
2518                                 bond_alb_handle_link_change(bond, slave,
2519                                                             BOND_LINK_DOWN);
2520
2521                         if (slave == bond->curr_active_slave)
2522                                 goto do_failover;
2523
2524                         continue;
2525
2526                 default:
2527                         pr_err("%s: invalid new link %d on slave %s\n",
2528                                bond->dev->name, slave->new_link,
2529                                slave->dev->name);
2530                         slave->new_link = BOND_LINK_NOCHANGE;
2531
2532                         continue;
2533                 }
2534
2535 do_failover:
2536                 ASSERT_RTNL();
2537                 block_netpoll_tx();
2538                 write_lock_bh(&bond->curr_slave_lock);
2539                 bond_select_active_slave(bond);
2540                 write_unlock_bh(&bond->curr_slave_lock);
2541                 unblock_netpoll_tx();
2542         }
2543
2544         bond_set_carrier(bond);
2545 }
2546
2547 /*
2548  * bond_mii_monitor
2549  *
2550  * Really a wrapper that splits the mii monitor into two phases: an
2551  * inspection, then (if inspection indicates something needs to be done)
2552  * an acquisition of appropriate locks followed by a commit phase to
2553  * implement whatever link state changes are indicated.
2554  */
2555 void bond_mii_monitor(struct work_struct *work)
2556 {
2557         struct bonding *bond = container_of(work, struct bonding,
2558                                             mii_work.work);
2559
2560         read_lock(&bond->lock);
2561         if (bond->kill_timers)
2562                 goto out;
2563
2564         if (bond->slave_cnt == 0)
2565                 goto re_arm;
2566
2567         if (bond_miimon_inspect(bond)) {
2568                 read_unlock(&bond->lock);
2569                 rtnl_lock();
2570                 read_lock(&bond->lock);
2571
2572                 bond_miimon_commit(bond);
2573
2574                 read_unlock(&bond->lock);
2575                 rtnl_unlock();  /* might sleep, hold no other locks */
2576                 read_lock(&bond->lock);
2577         }
2578
2579 re_arm:
2580         if (bond->params.miimon)
2581                 queue_delayed_work(bond->wq, &bond->mii_work,
2582                                    msecs_to_jiffies(bond->params.miimon));
2583 out:
2584         read_unlock(&bond->lock);
2585 }
2586
2587 static __be32 bond_glean_dev_ip(struct net_device *dev)
2588 {
2589         struct in_device *idev;
2590         struct in_ifaddr *ifa;
2591         __be32 addr = 0;
2592
2593         if (!dev)
2594                 return 0;
2595
2596         rcu_read_lock();
2597         idev = __in_dev_get_rcu(dev);
2598         if (!idev)
2599                 goto out;
2600
2601         ifa = idev->ifa_list;
2602         if (!ifa)
2603                 goto out;
2604
2605         addr = ifa->ifa_local;
2606 out:
2607         rcu_read_unlock();
2608         return addr;
2609 }
2610
2611 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2612 {
2613         struct vlan_entry *vlan;
2614
2615         if (ip == bond->master_ip)
2616                 return 1;
2617
2618         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2619                 if (ip == vlan->vlan_ip)
2620                         return 1;
2621         }
2622
2623         return 0;
2624 }
2625
2626 /*
2627  * We go to the (large) trouble of VLAN tagging ARP frames because
2628  * switches in VLAN mode (especially if ports are configured as
2629  * "native" to a VLAN) might not pass non-tagged frames.
2630  */
2631 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2632 {
2633         struct sk_buff *skb;
2634
2635         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2636                  slave_dev->name, dest_ip, src_ip, vlan_id);
2637
2638         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2639                          NULL, slave_dev->dev_addr, NULL);
2640
2641         if (!skb) {
2642                 pr_err("ARP packet allocation failed\n");
2643                 return;
2644         }
2645         if (vlan_id) {
2646                 skb = vlan_put_tag(skb, vlan_id);
2647                 if (!skb) {
2648                         pr_err("failed to insert VLAN tag\n");
2649                         return;
2650                 }
2651         }
2652         arp_xmit(skb);
2653 }
2654
2655
2656 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2657 {
2658         int i, vlan_id;
2659         __be32 *targets = bond->params.arp_targets;
2660         struct vlan_entry *vlan;
2661         struct net_device *vlan_dev;
2662         struct rtable *rt;
2663
2664         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2665                 if (!targets[i])
2666                         break;
2667                 pr_debug("basa: target %x\n", targets[i]);
2668                 if (!bond->vlgrp) {
2669                         pr_debug("basa: empty vlan: arp_send\n");
2670                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2671                                       bond->master_ip, 0);
2672                         continue;
2673                 }
2674
2675                 /*
2676                  * If VLANs are configured, we do a route lookup to
2677                  * determine which VLAN interface would be used, so we
2678                  * can tag the ARP with the proper VLAN tag.
2679                  */
2680                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2681                                      RTO_ONLINK, 0);
2682                 if (IS_ERR(rt)) {
2683                         if (net_ratelimit()) {
2684                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2685                                            bond->dev->name, &targets[i]);
2686                         }
2687                         continue;
2688                 }
2689
2690                 /*
2691                  * This target is not on a VLAN
2692                  */
2693                 if (rt->dst.dev == bond->dev) {
2694                         ip_rt_put(rt);
2695                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2696                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2697                                       bond->master_ip, 0);
2698                         continue;
2699                 }
2700
2701                 vlan_id = 0;
2702                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2703                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2704                         if (vlan_dev == rt->dst.dev) {
2705                                 vlan_id = vlan->vlan_id;
2706                                 pr_debug("basa: vlan match on %s %d\n",
2707                                        vlan_dev->name, vlan_id);
2708                                 break;
2709                         }
2710                 }
2711
2712                 if (vlan_id) {
2713                         ip_rt_put(rt);
2714                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2715                                       vlan->vlan_ip, vlan_id);
2716                         continue;
2717                 }
2718
2719                 if (net_ratelimit()) {
2720                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2721                                    bond->dev->name, &targets[i],
2722                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2723                 }
2724                 ip_rt_put(rt);
2725         }
2726 }
2727
2728 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2729 {
2730         int i;
2731         __be32 *targets = bond->params.arp_targets;
2732
2733         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2734                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2735                          &sip, &tip, i, &targets[i],
2736                          bond_has_this_ip(bond, tip));
2737                 if (sip == targets[i]) {
2738                         if (bond_has_this_ip(bond, tip))
2739                                 slave->last_arp_rx = jiffies;
2740                         return;
2741                 }
2742         }
2743 }
2744
2745 static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond,
2746                          struct slave *slave)
2747 {
2748         struct arphdr *arp;
2749         unsigned char *arp_ptr;
2750         __be32 sip, tip;
2751
2752         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2753                 return;
2754
2755         read_lock(&bond->lock);
2756
2757         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2758                  bond->dev->name, skb->dev->name);
2759
2760         if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
2761                 goto out_unlock;
2762
2763         arp = arp_hdr(skb);
2764         if (arp->ar_hln != bond->dev->addr_len ||
2765             skb->pkt_type == PACKET_OTHERHOST ||
2766             skb->pkt_type == PACKET_LOOPBACK ||
2767             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2768             arp->ar_pro != htons(ETH_P_IP) ||
2769             arp->ar_pln != 4)
2770                 goto out_unlock;
2771
2772         arp_ptr = (unsigned char *)(arp + 1);
2773         arp_ptr += bond->dev->addr_len;
2774         memcpy(&sip, arp_ptr, 4);
2775         arp_ptr += 4 + bond->dev->addr_len;
2776         memcpy(&tip, arp_ptr, 4);
2777
2778         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2779                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2780                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2781                  &sip, &tip);
2782
2783         /*
2784          * Backup slaves won't see the ARP reply, but do come through
2785          * here for each ARP probe (so we swap the sip/tip to validate
2786          * the probe).  In a "redundant switch, common router" type of
2787          * configuration, the ARP probe will (hopefully) travel from
2788          * the active, through one switch, the router, then the other
2789          * switch before reaching the backup.
2790          */
2791         if (bond_is_active_slave(slave))
2792                 bond_validate_arp(bond, slave, sip, tip);
2793         else
2794                 bond_validate_arp(bond, slave, tip, sip);
2795
2796 out_unlock:
2797         read_unlock(&bond->lock);
2798 }
2799
2800 /*
2801  * this function is called regularly to monitor each slave's link
2802  * ensuring that traffic is being sent and received when arp monitoring
2803  * is used in load-balancing mode. if the adapter has been dormant, then an
2804  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2805  * arp monitoring in active backup mode.
2806  */
2807 void bond_loadbalance_arp_mon(struct work_struct *work)
2808 {
2809         struct bonding *bond = container_of(work, struct bonding,
2810                                             arp_work.work);
2811         struct slave *slave, *oldcurrent;
2812         int do_failover = 0;
2813         int delta_in_ticks;
2814         int i;
2815
2816         read_lock(&bond->lock);
2817
2818         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2819
2820         if (bond->kill_timers)
2821                 goto out;
2822
2823         if (bond->slave_cnt == 0)
2824                 goto re_arm;
2825
2826         read_lock(&bond->curr_slave_lock);
2827         oldcurrent = bond->curr_active_slave;
2828         read_unlock(&bond->curr_slave_lock);
2829
2830         /* see if any of the previous devices are up now (i.e. they have
2831          * xmt and rcv traffic). the curr_active_slave does not come into
2832          * the picture unless it is null. also, slave->jiffies is not needed
2833          * here because we send an arp on each slave and give a slave as
2834          * long as it needs to get the tx/rx within the delta.
2835          * TODO: what about up/down delay in arp mode? it wasn't here before
2836          *       so it can wait
2837          */
2838         bond_for_each_slave(bond, slave, i) {
2839                 unsigned long trans_start = dev_trans_start(slave->dev);
2840
2841                 if (slave->link != BOND_LINK_UP) {
2842                         if (time_in_range(jiffies,
2843                                 trans_start - delta_in_ticks,
2844                                 trans_start + delta_in_ticks) &&
2845                             time_in_range(jiffies,
2846                                 slave->dev->last_rx - delta_in_ticks,
2847                                 slave->dev->last_rx + delta_in_ticks)) {
2848
2849                                 slave->link  = BOND_LINK_UP;
2850                                 bond_set_active_slave(slave);
2851
2852                                 /* primary_slave has no meaning in round-robin
2853                                  * mode. the window of a slave being up and
2854                                  * curr_active_slave being null after enslaving
2855                                  * is closed.
2856                                  */
2857                                 if (!oldcurrent) {
2858                                         pr_info("%s: link status definitely up for interface %s, ",
2859                                                 bond->dev->name,
2860                                                 slave->dev->name);
2861                                         do_failover = 1;
2862                                 } else {
2863                                         pr_info("%s: interface %s is now up\n",
2864                                                 bond->dev->name,
2865                                                 slave->dev->name);
2866                                 }
2867                         }
2868                 } else {
2869                         /* slave->link == BOND_LINK_UP */
2870
2871                         /* not all switches will respond to an arp request
2872                          * when the source ip is 0, so don't take the link down
2873                          * if we don't know our ip yet
2874                          */
2875                         if (!time_in_range(jiffies,
2876                                 trans_start - delta_in_ticks,
2877                                 trans_start + 2 * delta_in_ticks) ||
2878                             !time_in_range(jiffies,
2879                                 slave->dev->last_rx - delta_in_ticks,
2880                                 slave->dev->last_rx + 2 * delta_in_ticks)) {
2881
2882                                 slave->link  = BOND_LINK_DOWN;
2883                                 bond_set_backup_slave(slave);
2884
2885                                 if (slave->link_failure_count < UINT_MAX)
2886                                         slave->link_failure_count++;
2887
2888                                 pr_info("%s: interface %s is now down.\n",
2889                                         bond->dev->name,
2890                                         slave->dev->name);
2891
2892                                 if (slave == oldcurrent)
2893                                         do_failover = 1;
2894                         }
2895                 }
2896
2897                 /* note: if switch is in round-robin mode, all links
2898                  * must tx arp to ensure all links rx an arp - otherwise
2899                  * links may oscillate or not come up at all; if switch is
2900                  * in something like xor mode, there is nothing we can
2901                  * do - all replies will be rx'ed on same link causing slaves
2902                  * to be unstable during low/no traffic periods
2903                  */
2904                 if (IS_UP(slave->dev))
2905                         bond_arp_send_all(bond, slave);
2906         }
2907
2908         if (do_failover) {
2909                 block_netpoll_tx();
2910                 write_lock_bh(&bond->curr_slave_lock);
2911
2912                 bond_select_active_slave(bond);
2913
2914                 write_unlock_bh(&bond->curr_slave_lock);
2915                 unblock_netpoll_tx();
2916         }
2917
2918 re_arm:
2919         if (bond->params.arp_interval)
2920                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2921 out:
2922         read_unlock(&bond->lock);
2923 }
2924
2925 /*
2926  * Called to inspect slaves for active-backup mode ARP monitor link state
2927  * changes.  Sets new_link in slaves to specify what action should take
2928  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2929  * to link states must be committed.
2930  *
2931  * Called with bond->lock held for read.
2932  */
2933 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2934 {
2935         struct slave *slave;
2936         int i, commit = 0;
2937         unsigned long trans_start;
2938
2939         bond_for_each_slave(bond, slave, i) {
2940                 slave->new_link = BOND_LINK_NOCHANGE;
2941
2942                 if (slave->link != BOND_LINK_UP) {
2943                         if (time_in_range(jiffies,
2944                                 slave_last_rx(bond, slave) - delta_in_ticks,
2945                                 slave_last_rx(bond, slave) + delta_in_ticks)) {
2946
2947                                 slave->new_link = BOND_LINK_UP;
2948                                 commit++;
2949                         }
2950
2951                         continue;
2952                 }
2953
2954                 /*
2955                  * Give slaves 2*delta after being enslaved or made
2956                  * active.  This avoids bouncing, as the last receive
2957                  * times need a full ARP monitor cycle to be updated.
2958                  */
2959                 if (time_in_range(jiffies,
2960                                   slave->jiffies - delta_in_ticks,
2961                                   slave->jiffies + 2 * delta_in_ticks))
2962                         continue;
2963
2964                 /*
2965                  * Backup slave is down if:
2966                  * - No current_arp_slave AND
2967                  * - more than 3*delta since last receive AND
2968                  * - the bond has an IP address
2969                  *
2970                  * Note: a non-null current_arp_slave indicates
2971                  * the curr_active_slave went down and we are
2972                  * searching for a new one; under this condition
2973                  * we only take the curr_active_slave down - this
2974                  * gives each slave a chance to tx/rx traffic
2975                  * before being taken out
2976                  */
2977                 if (!bond_is_active_slave(slave) &&
2978                     !bond->current_arp_slave &&
2979                     !time_in_range(jiffies,
2980                         slave_last_rx(bond, slave) - delta_in_ticks,
2981                         slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2982
2983                         slave->new_link = BOND_LINK_DOWN;
2984                         commit++;
2985                 }
2986
2987                 /*
2988                  * Active slave is down if:
2989                  * - more than 2*delta since transmitting OR
2990                  * - (more than 2*delta since receive AND
2991                  *    the bond has an IP address)
2992                  */
2993                 trans_start = dev_trans_start(slave->dev);
2994                 if (bond_is_active_slave(slave) &&
2995                     (!time_in_range(jiffies,
2996                         trans_start - delta_in_ticks,
2997                         trans_start + 2 * delta_in_ticks) ||
2998                      !time_in_range(jiffies,
2999                         slave_last_rx(bond, slave) - delta_in_ticks,
3000                         slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
3001
3002                         slave->new_link = BOND_LINK_DOWN;
3003                         commit++;
3004                 }
3005         }
3006
3007         return commit;
3008 }
3009
3010 /*
3011  * Called to commit link state changes noted by inspection step of
3012  * active-backup mode ARP monitor.
3013  *
3014  * Called with RTNL and bond->lock for read.
3015  */
3016 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3017 {
3018         struct slave *slave;
3019         int i;
3020         unsigned long trans_start;
3021
3022         bond_for_each_slave(bond, slave, i) {
3023                 switch (slave->new_link) {
3024                 case BOND_LINK_NOCHANGE:
3025                         continue;
3026
3027                 case BOND_LINK_UP:
3028                         trans_start = dev_trans_start(slave->dev);
3029                         if ((!bond->curr_active_slave &&
3030                              time_in_range(jiffies,
3031                                            trans_start - delta_in_ticks,
3032                                            trans_start + delta_in_ticks)) ||
3033                             bond->curr_active_slave != slave) {
3034                                 slave->link = BOND_LINK_UP;
3035                                 bond->current_arp_slave = NULL;
3036
3037                                 pr_info("%s: link status definitely up for interface %s.\n",
3038                                         bond->dev->name, slave->dev->name);
3039
3040                                 if (!bond->curr_active_slave ||
3041                                     (slave == bond->primary_slave))
3042                                         goto do_failover;
3043
3044                         }
3045
3046                         continue;
3047
3048                 case BOND_LINK_DOWN:
3049                         if (slave->link_failure_count < UINT_MAX)
3050                                 slave->link_failure_count++;
3051
3052                         slave->link = BOND_LINK_DOWN;
3053                         bond_set_slave_inactive_flags(slave);
3054
3055                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
3056                                 bond->dev->name, slave->dev->name);
3057
3058                         if (slave == bond->curr_active_slave) {
3059                                 bond->current_arp_slave = NULL;
3060                                 goto do_failover;
3061                         }
3062
3063                         continue;
3064
3065                 default:
3066                         pr_err("%s: impossible: new_link %d on slave %s\n",
3067                                bond->dev->name, slave->new_link,
3068                                slave->dev->name);
3069                         continue;
3070                 }
3071
3072 do_failover:
3073                 ASSERT_RTNL();
3074                 block_netpoll_tx();
3075                 write_lock_bh(&bond->curr_slave_lock);
3076                 bond_select_active_slave(bond);
3077                 write_unlock_bh(&bond->curr_slave_lock);
3078                 unblock_netpoll_tx();
3079         }
3080
3081         bond_set_carrier(bond);
3082 }
3083
3084 /*
3085  * Send ARP probes for active-backup mode ARP monitor.
3086  *
3087  * Called with bond->lock held for read.
3088  */
3089 static void bond_ab_arp_probe(struct bonding *bond)
3090 {
3091         struct slave *slave;
3092         int i;
3093
3094         read_lock(&bond->curr_slave_lock);
3095
3096         if (bond->current_arp_slave && bond->curr_active_slave)
3097                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3098                         bond->current_arp_slave->dev->name,
3099                         bond->curr_active_slave->dev->name);
3100
3101         if (bond->curr_active_slave) {
3102                 bond_arp_send_all(bond, bond->curr_active_slave);
3103                 read_unlock(&bond->curr_slave_lock);
3104                 return;
3105         }
3106
3107         read_unlock(&bond->curr_slave_lock);
3108
3109         /* if we don't have a curr_active_slave, search for the next available
3110          * backup slave from the current_arp_slave and make it the candidate
3111          * for becoming the curr_active_slave
3112          */
3113
3114         if (!bond->current_arp_slave) {
3115                 bond->current_arp_slave = bond->first_slave;
3116                 if (!bond->current_arp_slave)
3117                         return;
3118         }
3119
3120         bond_set_slave_inactive_flags(bond->current_arp_slave);
3121
3122         /* search for next candidate */
3123         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3124                 if (IS_UP(slave->dev)) {
3125                         slave->link = BOND_LINK_BACK;
3126                         bond_set_slave_active_flags(slave);
3127                         bond_arp_send_all(bond, slave);
3128                         slave->jiffies = jiffies;
3129                         bond->current_arp_slave = slave;
3130                         break;
3131                 }
3132
3133                 /* if the link state is up at this point, we
3134                  * mark it down - this can happen if we have
3135                  * simultaneous link failures and
3136                  * reselect_active_interface doesn't make this
3137                  * one the current slave so it is still marked
3138                  * up when it is actually down
3139                  */
3140                 if (slave->link == BOND_LINK_UP) {
3141                         slave->link = BOND_LINK_DOWN;
3142                         if (slave->link_failure_count < UINT_MAX)
3143                                 slave->link_failure_count++;
3144
3145                         bond_set_slave_inactive_flags(slave);
3146
3147                         pr_info("%s: backup interface %s is now down.\n",
3148                                 bond->dev->name, slave->dev->name);
3149                 }
3150         }
3151 }
3152
3153 void bond_activebackup_arp_mon(struct work_struct *work)
3154 {
3155         struct bonding *bond = container_of(work, struct bonding,
3156                                             arp_work.work);
3157         int delta_in_ticks;
3158
3159         read_lock(&bond->lock);
3160
3161         if (bond->kill_timers)
3162                 goto out;
3163
3164         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3165
3166         if (bond->slave_cnt == 0)
3167                 goto re_arm;
3168
3169         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3170                 read_unlock(&bond->lock);
3171                 rtnl_lock();
3172                 read_lock(&bond->lock);
3173
3174                 bond_ab_arp_commit(bond, delta_in_ticks);
3175
3176                 read_unlock(&bond->lock);
3177                 rtnl_unlock();
3178                 read_lock(&bond->lock);
3179         }
3180
3181         bond_ab_arp_probe(bond);
3182
3183 re_arm:
3184         if (bond->params.arp_interval)
3185                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3186 out:
3187         read_unlock(&bond->lock);
3188 }
3189
3190 /*-------------------------- netdev event handling --------------------------*/
3191
3192 /*
3193  * Change device name
3194  */
3195 static int bond_event_changename(struct bonding *bond)
3196 {
3197         bond_remove_proc_entry(bond);
3198         bond_create_proc_entry(bond);
3199
3200         bond_debug_reregister(bond);
3201
3202         return NOTIFY_DONE;
3203 }
3204
3205 static int bond_master_netdev_event(unsigned long event,
3206                                     struct net_device *bond_dev)
3207 {
3208         struct bonding *event_bond = netdev_priv(bond_dev);
3209
3210         switch (event) {
3211         case NETDEV_CHANGENAME:
3212                 return bond_event_changename(event_bond);
3213         default:
3214                 break;
3215         }
3216
3217         return NOTIFY_DONE;
3218 }
3219
3220 static int bond_slave_netdev_event(unsigned long event,
3221                                    struct net_device *slave_dev)
3222 {
3223         struct net_device *bond_dev = slave_dev->master;
3224         struct bonding *bond = netdev_priv(bond_dev);
3225
3226         switch (event) {
3227         case NETDEV_UNREGISTER:
3228                 if (bond_dev) {
3229                         if (bond->setup_by_slave)
3230                                 bond_release_and_destroy(bond_dev, slave_dev);
3231                         else
3232                                 bond_release(bond_dev, slave_dev);
3233                 }
3234                 break;
3235         case NETDEV_CHANGE:
3236                 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3237                         struct slave *slave;
3238
3239                         slave = bond_get_slave_by_dev(bond, slave_dev);
3240                         if (slave) {
3241                                 u32 old_speed = slave->speed;
3242                                 u8  old_duplex = slave->duplex;
3243
3244                                 bond_update_speed_duplex(slave);
3245
3246                                 if (bond_is_lb(bond))
3247                                         break;
3248
3249                                 if (old_speed != slave->speed)
3250                                         bond_3ad_adapter_speed_changed(slave);
3251                                 if (old_duplex != slave->duplex)
3252                                         bond_3ad_adapter_duplex_changed(slave);
3253                         }
3254                 }
3255
3256                 break;
3257         case NETDEV_DOWN:
3258                 /*
3259                  * ... Or is it this?
3260                  */
3261                 break;
3262         case NETDEV_CHANGEMTU:
3263                 /*
3264                  * TODO: Should slaves be allowed to
3265                  * independently alter their MTU?  For
3266                  * an active-backup bond, slaves need
3267                  * not be the same type of device, so
3268                  * MTUs may vary.  For other modes,
3269                  * slaves arguably should have the
3270                  * same MTUs. To do this, we'd need to
3271                  * take over the slave's change_mtu
3272                  * function for the duration of their
3273                  * servitude.
3274                  */
3275                 break;
3276         case NETDEV_CHANGENAME:
3277                 /*
3278                  * TODO: handle changing the primary's name
3279                  */
3280                 break;
3281         case NETDEV_FEAT_CHANGE:
3282                 bond_compute_features(bond);
3283                 break;
3284         default:
3285                 break;
3286         }
3287
3288         return NOTIFY_DONE;
3289 }
3290
3291 /*
3292  * bond_netdev_event: handle netdev notifier chain events.
3293  *
3294  * This function receives events for the netdev chain.  The caller (an
3295  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3296  * locks for us to safely manipulate the slave devices (RTNL lock,
3297  * dev_probe_lock).
3298  */
3299 static int bond_netdev_event(struct notifier_block *this,
3300                              unsigned long event, void *ptr)
3301 {
3302         struct net_device *event_dev = (struct net_device *)ptr;
3303
3304         pr_debug("event_dev: %s, event: %lx\n",
3305                  event_dev ? event_dev->name : "None",
3306                  event);
3307
3308         if (!(event_dev->priv_flags & IFF_BONDING))
3309                 return NOTIFY_DONE;
3310
3311         if (event_dev->flags & IFF_MASTER) {
3312                 pr_debug("IFF_MASTER\n");
3313                 return bond_master_netdev_event(event, event_dev);
3314         }
3315
3316         if (event_dev->flags & IFF_SLAVE) {
3317                 pr_debug("IFF_SLAVE\n");
3318                 return bond_slave_netdev_event(event, event_dev);
3319         }
3320
3321         return NOTIFY_DONE;
3322 }
3323
3324 /*
3325  * bond_inetaddr_event: handle inetaddr notifier chain events.
3326  *
3327  * We keep track of device IPs primarily to use as source addresses in
3328  * ARP monitor probes (rather than spewing out broadcasts all the time).
3329  *
3330  * We track one IP for the main device (if it has one), plus one per VLAN.
3331  */
3332 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3333 {
3334         struct in_ifaddr *ifa = ptr;
3335         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3336         struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3337         struct bonding *bond;
3338         struct vlan_entry *vlan;
3339
3340         list_for_each_entry(bond, &bn->dev_list, bond_list) {
3341                 if (bond->dev == event_dev) {
3342                         switch (event) {
3343                         case NETDEV_UP:
3344                                 bond->master_ip = ifa->ifa_local;
3345                                 return NOTIFY_OK;
3346                         case NETDEV_DOWN:
3347                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3348                                 return NOTIFY_OK;
3349                         default:
3350                                 return NOTIFY_DONE;
3351                         }
3352                 }
3353
3354                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3355                         if (!bond->vlgrp)
3356                                 continue;
3357                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3358                         if (vlan_dev == event_dev) {
3359                                 switch (event) {
3360                                 case NETDEV_UP:
3361                                         vlan->vlan_ip = ifa->ifa_local;
3362                                         return NOTIFY_OK;
3363                                 case NETDEV_DOWN:
3364                                         vlan->vlan_ip =
3365                                                 bond_glean_dev_ip(vlan_dev);
3366                                         return NOTIFY_OK;
3367                                 default:
3368                                         return NOTIFY_DONE;
3369                                 }
3370                         }
3371                 }
3372         }
3373         return NOTIFY_DONE;
3374 }
3375
3376 static struct notifier_block bond_netdev_notifier = {
3377         .notifier_call = bond_netdev_event,
3378 };
3379
3380 static struct notifier_block bond_inetaddr_notifier = {
3381         .notifier_call = bond_inetaddr_event,
3382 };
3383
3384 /*---------------------------- Hashing Policies -----------------------------*/
3385
3386 /*
3387  * Hash for the output device based upon layer 2 and layer 3 data. If
3388  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3389  */
3390 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3391 {
3392         struct ethhdr *data = (struct ethhdr *)skb->data;
3393         struct iphdr *iph = ip_hdr(skb);
3394
3395         if (skb->protocol == htons(ETH_P_IP)) {
3396                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3397                         (data->h_dest[5] ^ data->h_source[5])) % count;
3398         }
3399
3400         return (data->h_dest[5] ^ data->h_source[5]) % count;
3401 }
3402
3403 /*
3404  * Hash for the output device based upon layer 3 and layer 4 data. If
3405  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3406  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3407  */
3408 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3409 {
3410         struct ethhdr *data = (struct ethhdr *)skb->data;
3411         struct iphdr *iph = ip_hdr(skb);
3412         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3413         int layer4_xor = 0;
3414
3415         if (skb->protocol == htons(ETH_P_IP)) {
3416                 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3417                     (iph->protocol == IPPROTO_TCP ||
3418                      iph->protocol == IPPROTO_UDP)) {
3419                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3420                 }
3421                 return (layer4_xor ^
3422                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3423
3424         }
3425
3426         return (data->h_dest[5] ^ data->h_source[5]) % count;
3427 }
3428
3429 /*
3430  * Hash for the output device based upon layer 2 data
3431  */
3432 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3433 {
3434         struct ethhdr *data = (struct ethhdr *)skb->data;
3435
3436         return (data->h_dest[5] ^ data->h_source[5]) % count;
3437 }
3438
3439 /*-------------------------- Device entry points ----------------------------*/
3440
3441 static int bond_open(struct net_device *bond_dev)
3442 {
3443         struct bonding *bond = netdev_priv(bond_dev);
3444
3445         bond->kill_timers = 0;
3446
3447         INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3448
3449         if (bond_is_lb(bond)) {
3450                 /* bond_alb_initialize must be called before the timer
3451                  * is started.
3452                  */
3453                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3454                         /* something went wrong - fail the open operation */
3455                         return -ENOMEM;
3456                 }
3457
3458                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3459                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3460         }
3461
3462         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3463                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3464                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3465         }
3466
3467         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3468                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3469                         INIT_DELAYED_WORK(&bond->arp_work,
3470                                           bond_activebackup_arp_mon);
3471                 else
3472                         INIT_DELAYED_WORK(&bond->arp_work,
3473                                           bond_loadbalance_arp_mon);
3474
3475                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3476                 if (bond->params.arp_validate)
3477                         bond->recv_probe = bond_arp_rcv;
3478         }
3479
3480         if (bond->params.mode == BOND_MODE_8023AD) {
3481                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3482                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3483                 /* register to receive LACPDUs */
3484                 bond->recv_probe = bond_3ad_lacpdu_recv;
3485                 bond_3ad_initiate_agg_selection(bond, 1);
3486         }
3487
3488         return 0;
3489 }
3490
3491 static int bond_close(struct net_device *bond_dev)
3492 {
3493         struct bonding *bond = netdev_priv(bond_dev);
3494
3495         write_lock_bh(&bond->lock);
3496
3497         /* signal timers not to re-arm */
3498         bond->kill_timers = 1;
3499
3500         write_unlock_bh(&bond->lock);
3501
3502         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3503                 cancel_delayed_work(&bond->mii_work);
3504         }
3505
3506         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3507                 cancel_delayed_work(&bond->arp_work);
3508         }
3509
3510         switch (bond->params.mode) {
3511         case BOND_MODE_8023AD:
3512                 cancel_delayed_work(&bond->ad_work);
3513                 break;
3514         case BOND_MODE_TLB:
3515         case BOND_MODE_ALB:
3516                 cancel_delayed_work(&bond->alb_work);
3517                 break;
3518         default:
3519                 break;
3520         }
3521
3522         if (delayed_work_pending(&bond->mcast_work))
3523                 cancel_delayed_work(&bond->mcast_work);
3524
3525         if (bond_is_lb(bond)) {
3526                 /* Must be called only after all
3527                  * slaves have been released
3528                  */
3529                 bond_alb_deinitialize(bond);
3530         }
3531         bond->recv_probe = NULL;
3532
3533         return 0;
3534 }
3535
3536 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3537                                                 struct rtnl_link_stats64 *stats)
3538 {
3539         struct bonding *bond = netdev_priv(bond_dev);
3540         struct rtnl_link_stats64 temp;
3541         struct slave *slave;
3542         int i;
3543
3544         memset(stats, 0, sizeof(*stats));
3545
3546         read_lock_bh(&bond->lock);
3547
3548         bond_for_each_slave(bond, slave, i) {
3549                 const struct rtnl_link_stats64 *sstats =
3550                         dev_get_stats(slave->dev, &temp);
3551
3552                 stats->rx_packets += sstats->rx_packets;
3553                 stats->rx_bytes += sstats->rx_bytes;
3554                 stats->rx_errors += sstats->rx_errors;
3555                 stats->rx_dropped += sstats->rx_dropped;
3556
3557                 stats->tx_packets += sstats->tx_packets;
3558                 stats->tx_bytes += sstats->tx_bytes;
3559                 stats->tx_errors += sstats->tx_errors;
3560                 stats->tx_dropped += sstats->tx_dropped;
3561
3562                 stats->multicast += sstats->multicast;
3563                 stats->collisions += sstats->collisions;
3564
3565                 stats->rx_length_errors += sstats->rx_length_errors;
3566                 stats->rx_over_errors += sstats->rx_over_errors;
3567                 stats->rx_crc_errors += sstats->rx_crc_errors;
3568                 stats->rx_frame_errors += sstats->rx_frame_errors;
3569                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3570                 stats->rx_missed_errors += sstats->rx_missed_errors;
3571
3572                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3573                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3574                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3575                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3576                 stats->tx_window_errors += sstats->tx_window_errors;
3577         }
3578
3579         read_unlock_bh(&bond->lock);
3580
3581         return stats;
3582 }
3583
3584 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3585 {
3586         struct net_device *slave_dev = NULL;
3587         struct ifbond k_binfo;
3588         struct ifbond __user *u_binfo = NULL;
3589         struct ifslave k_sinfo;
3590         struct ifslave __user *u_sinfo = NULL;
3591         struct mii_ioctl_data *mii = NULL;
3592         int res = 0;
3593
3594         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3595
3596         switch (cmd) {
3597         case SIOCGMIIPHY:
3598                 mii = if_mii(ifr);
3599                 if (!mii)
3600                         return -EINVAL;
3601
3602                 mii->phy_id = 0;
3603                 /* Fall Through */
3604         case SIOCGMIIREG:
3605                 /*
3606                  * We do this again just in case we were called by SIOCGMIIREG
3607                  * instead of SIOCGMIIPHY.
3608                  */
3609                 mii = if_mii(ifr);
3610                 if (!mii)
3611                         return -EINVAL;
3612
3613
3614                 if (mii->reg_num == 1) {
3615                         struct bonding *bond = netdev_priv(bond_dev);
3616                         mii->val_out = 0;
3617                         read_lock(&bond->lock);
3618                         read_lock(&bond->curr_slave_lock);
3619                         if (netif_carrier_ok(bond->dev))
3620                                 mii->val_out = BMSR_LSTATUS;
3621
3622                         read_unlock(&bond->curr_slave_lock);
3623                         read_unlock(&bond->lock);
3624                 }
3625
3626                 return 0;
3627         case BOND_INFO_QUERY_OLD:
3628         case SIOCBONDINFOQUERY:
3629                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3630
3631                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3632                         return -EFAULT;
3633
3634                 res = bond_info_query(bond_dev, &k_binfo);
3635                 if (res == 0 &&
3636                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3637                         return -EFAULT;
3638
3639                 return res;
3640         case BOND_SLAVE_INFO_QUERY_OLD:
3641         case SIOCBONDSLAVEINFOQUERY:
3642                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3643
3644                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3645                         return -EFAULT;
3646
3647                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3648                 if (res == 0 &&
3649                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3650                         return -EFAULT;
3651
3652                 return res;
3653         default:
3654                 /* Go on */
3655                 break;
3656         }
3657
3658         if (!capable(CAP_NET_ADMIN))
3659                 return -EPERM;
3660
3661         slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3662
3663         pr_debug("slave_dev=%p:\n", slave_dev);
3664
3665         if (!slave_dev)
3666                 res = -ENODEV;
3667         else {
3668                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3669                 switch (cmd) {
3670                 case BOND_ENSLAVE_OLD:
3671                 case SIOCBONDENSLAVE:
3672                         res = bond_enslave(bond_dev, slave_dev);
3673                         break;
3674                 case BOND_RELEASE_OLD:
3675                 case SIOCBONDRELEASE:
3676                         res = bond_release(bond_dev, slave_dev);
3677                         break;
3678                 case BOND_SETHWADDR_OLD:
3679                 case SIOCBONDSETHWADDR:
3680                         res = bond_sethwaddr(bond_dev, slave_dev);
3681                         break;
3682                 case BOND_CHANGE_ACTIVE_OLD:
3683                 case SIOCBONDCHANGEACTIVE:
3684                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3685                         break;
3686                 default:
3687                         res = -EOPNOTSUPP;
3688                 }
3689
3690                 dev_put(slave_dev);
3691         }
3692
3693         return res;
3694 }
3695
3696 static bool bond_addr_in_mc_list(unsigned char *addr,
3697                                  struct netdev_hw_addr_list *list,
3698                                  int addrlen)
3699 {
3700         struct netdev_hw_addr *ha;
3701
3702         netdev_hw_addr_list_for_each(ha, list)
3703                 if (!memcmp(ha->addr, addr, addrlen))
3704                         return true;
3705
3706         return false;
3707 }
3708
3709 static void bond_set_multicast_list(struct net_device *bond_dev)
3710 {
3711         struct bonding *bond = netdev_priv(bond_dev);
3712         struct netdev_hw_addr *ha;
3713         bool found;
3714
3715         /*
3716          * Do promisc before checking multicast_mode
3717          */
3718         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC))
3719                 /*
3720                  * FIXME: Need to handle the error when one of the multi-slaves
3721                  * encounters error.
3722                  */
3723                 bond_set_promiscuity(bond, 1);
3724
3725
3726         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC))
3727                 bond_set_promiscuity(bond, -1);
3728
3729
3730         /* set allmulti flag to slaves */
3731         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI))
3732                 /*
3733                  * FIXME: Need to handle the error when one of the multi-slaves
3734                  * encounters error.
3735                  */
3736                 bond_set_allmulti(bond, 1);
3737
3738
3739         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI))
3740                 bond_set_allmulti(bond, -1);
3741
3742
3743         read_lock(&bond->lock);
3744
3745         bond->flags = bond_dev->flags;
3746
3747         /* looking for addresses to add to slaves' mc list */
3748         netdev_for_each_mc_addr(ha, bond_dev) {
3749                 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3750                                              bond_dev->addr_len);
3751                 if (!found)
3752                         bond_mc_add(bond, ha->addr);
3753         }
3754
3755         /* looking for addresses to delete from slaves' list */
3756         netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3757                 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3758                                              bond_dev->addr_len);
3759                 if (!found)
3760                         bond_mc_del(bond, ha->addr);
3761         }
3762
3763         /* save master's multicast list */
3764         __hw_addr_flush(&bond->mc_list);
3765         __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3766                                bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3767
3768         read_unlock(&bond->lock);
3769 }
3770
3771 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
3772 {
3773         struct bonding *bond = netdev_priv(dev);
3774         struct slave *slave = bond->first_slave;
3775
3776         if (slave) {
3777                 const struct net_device_ops *slave_ops
3778                         = slave->dev->netdev_ops;
3779                 if (slave_ops->ndo_neigh_setup)
3780                         return slave_ops->ndo_neigh_setup(slave->dev, parms);
3781         }
3782         return 0;
3783 }
3784
3785 /*
3786  * Change the MTU of all of a master's slaves to match the master
3787  */
3788 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3789 {
3790         struct bonding *bond = netdev_priv(bond_dev);
3791         struct slave *slave, *stop_at;
3792         int res = 0;
3793         int i;
3794
3795         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3796                  (bond_dev ? bond_dev->name : "None"), new_mtu);
3797
3798         /* Can't hold bond->lock with bh disabled here since
3799          * some base drivers panic. On the other hand we can't
3800          * hold bond->lock without bh disabled because we'll
3801          * deadlock. The only solution is to rely on the fact
3802          * that we're under rtnl_lock here, and the slaves
3803          * list won't change. This doesn't solve the problem
3804          * of setting the slave's MTU while it is
3805          * transmitting, but the assumption is that the base
3806          * driver can handle that.
3807          *
3808          * TODO: figure out a way to safely iterate the slaves
3809          * list, but without holding a lock around the actual
3810          * call to the base driver.
3811          */
3812
3813         bond_for_each_slave(bond, slave, i) {
3814                 pr_debug("s %p s->p %p c_m %p\n",
3815                          slave,
3816                          slave->prev,
3817                          slave->dev->netdev_ops->ndo_change_mtu);
3818
3819                 res = dev_set_mtu(slave->dev, new_mtu);
3820
3821                 if (res) {
3822                         /* If we failed to set the slave's mtu to the new value
3823                          * we must abort the operation even in ACTIVE_BACKUP
3824                          * mode, because if we allow the backup slaves to have
3825                          * different mtu values than the active slave we'll
3826                          * need to change their mtu when doing a failover. That
3827                          * means changing their mtu from timer context, which
3828                          * is probably not a good idea.
3829                          */
3830                         pr_debug("err %d %s\n", res, slave->dev->name);
3831                         goto unwind;
3832                 }
3833         }
3834
3835         bond_dev->mtu = new_mtu;
3836
3837         return 0;
3838
3839 unwind:
3840         /* unwind from head to the slave that failed */
3841         stop_at = slave;
3842         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3843                 int tmp_res;
3844
3845                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3846                 if (tmp_res) {
3847                         pr_debug("unwind err %d dev %s\n",
3848                                  tmp_res, slave->dev->name);
3849                 }
3850         }
3851
3852         return res;
3853 }
3854
3855 /*
3856  * Change HW address
3857  *
3858  * Note that many devices must be down to change the HW address, and
3859  * downing the master releases all slaves.  We can make bonds full of
3860  * bonding devices to test this, however.
3861  */
3862 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3863 {
3864         struct bonding *bond = netdev_priv(bond_dev);
3865         struct sockaddr *sa = addr, tmp_sa;
3866         struct slave *slave, *stop_at;
3867         int res = 0;
3868         int i;
3869
3870         if (bond->params.mode == BOND_MODE_ALB)
3871                 return bond_alb_set_mac_address(bond_dev, addr);
3872
3873
3874         pr_debug("bond=%p, name=%s\n",
3875                  bond, bond_dev ? bond_dev->name : "None");
3876
3877         /*
3878          * If fail_over_mac is set to active, do nothing and return
3879          * success.  Returning an error causes ifenslave to fail.
3880          */
3881         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3882                 return 0;
3883
3884         if (!is_valid_ether_addr(sa->sa_data))
3885                 return -EADDRNOTAVAIL;
3886
3887         /* Can't hold bond->lock with bh disabled here since
3888          * some base drivers panic. On the other hand we can't
3889          * hold bond->lock without bh disabled because we'll
3890          * deadlock. The only solution is to rely on the fact
3891          * that we're under rtnl_lock here, and the slaves
3892          * list won't change. This doesn't solve the problem
3893          * of setting the slave's hw address while it is
3894          * transmitting, but the assumption is that the base
3895          * driver can handle that.
3896          *
3897          * TODO: figure out a way to safely iterate the slaves
3898          * list, but without holding a lock around the actual
3899          * call to the base driver.
3900          */
3901
3902         bond_for_each_slave(bond, slave, i) {
3903                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3904                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3905
3906                 if (slave_ops->ndo_set_mac_address == NULL) {
3907                         res = -EOPNOTSUPP;
3908                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3909                         goto unwind;
3910                 }
3911
3912                 res = dev_set_mac_address(slave->dev, addr);
3913                 if (res) {
3914                         /* TODO: consider downing the slave
3915                          * and retry ?
3916                          * User should expect communications
3917                          * breakage anyway until ARP finish
3918                          * updating, so...
3919                          */
3920                         pr_debug("err %d %s\n", res, slave->dev->name);
3921                         goto unwind;
3922                 }
3923         }
3924
3925         /* success */
3926         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3927         return 0;
3928
3929 unwind:
3930         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3931         tmp_sa.sa_family = bond_dev->type;
3932
3933         /* unwind from head to the slave that failed */
3934         stop_at = slave;
3935         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3936                 int tmp_res;
3937
3938                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3939                 if (tmp_res) {
3940                         pr_debug("unwind err %d dev %s\n",
3941                                  tmp_res, slave->dev->name);
3942                 }
3943         }
3944
3945         return res;
3946 }
3947
3948 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3949 {
3950         struct bonding *bond = netdev_priv(bond_dev);
3951         struct slave *slave, *start_at;
3952         int i, slave_no, res = 1;
3953         struct iphdr *iph = ip_hdr(skb);
3954
3955         read_lock(&bond->lock);
3956
3957         if (!BOND_IS_OK(bond))
3958                 goto out;
3959         /*
3960          * Start with the curr_active_slave that joined the bond as the
3961          * default for sending IGMP traffic.  For failover purposes one
3962          * needs to maintain some consistency for the interface that will
3963          * send the join/membership reports.  The curr_active_slave found
3964          * will send all of this type of traffic.
3965          */
3966         if ((iph->protocol == IPPROTO_IGMP) &&
3967             (skb->protocol == htons(ETH_P_IP))) {
3968
3969                 read_lock(&bond->curr_slave_lock);
3970                 slave = bond->curr_active_slave;
3971                 read_unlock(&bond->curr_slave_lock);
3972
3973                 if (!slave)
3974                         goto out;
3975         } else {
3976                 /*
3977                  * Concurrent TX may collide on rr_tx_counter; we accept
3978                  * that as being rare enough not to justify using an
3979                  * atomic op here.
3980                  */
3981                 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3982
3983                 bond_for_each_slave(bond, slave, i) {
3984                         slave_no--;
3985                         if (slave_no < 0)
3986                                 break;
3987                 }
3988         }
3989
3990         start_at = slave;
3991         bond_for_each_slave_from(bond, slave, i, start_at) {
3992                 if (IS_UP(slave->dev) &&
3993                     (slave->link == BOND_LINK_UP) &&
3994                     bond_is_active_slave(slave)) {
3995                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3996                         break;
3997                 }
3998         }
3999
4000 out:
4001         if (res) {
4002                 /* no suitable interface, frame not sent */
4003                 dev_kfree_skb(skb);
4004         }
4005         read_unlock(&bond->lock);
4006         return NETDEV_TX_OK;
4007 }
4008
4009
4010 /*
4011  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4012  * the bond has a usable interface.
4013  */
4014 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4015 {
4016         struct bonding *bond = netdev_priv(bond_dev);
4017         int res = 1;
4018
4019         read_lock(&bond->lock);
4020         read_lock(&bond->curr_slave_lock);
4021
4022         if (!BOND_IS_OK(bond))
4023                 goto out;
4024
4025         if (!bond->curr_active_slave)
4026                 goto out;
4027
4028         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4029
4030 out:
4031         if (res)
4032                 /* no suitable interface, frame not sent */
4033                 dev_kfree_skb(skb);
4034
4035         read_unlock(&bond->curr_slave_lock);
4036         read_unlock(&bond->lock);
4037         return NETDEV_TX_OK;
4038 }
4039
4040 /*
4041  * In bond_xmit_xor() , we determine the output device by using a pre-
4042  * determined xmit_hash_policy(), If the selected device is not enabled,
4043  * find the next active slave.
4044  */
4045 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4046 {
4047         struct bonding *bond = netdev_priv(bond_dev);
4048         struct slave *slave, *start_at;
4049         int slave_no;
4050         int i;
4051         int res = 1;
4052
4053         read_lock(&bond->lock);
4054
4055         if (!BOND_IS_OK(bond))
4056                 goto out;
4057
4058         slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4059
4060         bond_for_each_slave(bond, slave, i) {
4061                 slave_no--;
4062                 if (slave_no < 0)
4063                         break;
4064         }
4065
4066         start_at = slave;
4067
4068         bond_for_each_slave_from(bond, slave, i, start_at) {
4069                 if (IS_UP(slave->dev) &&
4070                     (slave->link == BOND_LINK_UP) &&
4071                     bond_is_active_slave(slave)) {
4072                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4073                         break;
4074                 }
4075         }
4076
4077 out:
4078         if (res) {
4079                 /* no suitable interface, frame not sent */
4080                 dev_kfree_skb(skb);
4081         }
4082         read_unlock(&bond->lock);
4083         return NETDEV_TX_OK;
4084 }
4085
4086 /*
4087  * in broadcast mode, we send everything to all usable interfaces.
4088  */
4089 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4090 {
4091         struct bonding *bond = netdev_priv(bond_dev);
4092         struct slave *slave, *start_at;
4093         struct net_device *tx_dev = NULL;
4094         int i;
4095         int res = 1;
4096
4097         read_lock(&bond->lock);
4098
4099         if (!BOND_IS_OK(bond))
4100                 goto out;
4101
4102         read_lock(&bond->curr_slave_lock);
4103         start_at = bond->curr_active_slave;
4104         read_unlock(&bond->curr_slave_lock);
4105
4106         if (!start_at)
4107                 goto out;
4108
4109         bond_for_each_slave_from(bond, slave, i, start_at) {
4110                 if (IS_UP(slave->dev) &&
4111                     (slave->link == BOND_LINK_UP) &&
4112                     bond_is_active_slave(slave)) {
4113                         if (tx_dev) {
4114                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4115                                 if (!skb2) {
4116                                         pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4117                                                bond_dev->name);
4118                                         continue;
4119                                 }
4120
4121                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4122                                 if (res) {
4123                                         dev_kfree_skb(skb2);
4124                                         continue;
4125                                 }
4126                         }
4127                         tx_dev = slave->dev;
4128                 }
4129         }
4130
4131         if (tx_dev)
4132                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4133
4134 out:
4135         if (res)
4136                 /* no suitable interface, frame not sent */
4137                 dev_kfree_skb(skb);
4138
4139         /* frame sent to all suitable interfaces */
4140         read_unlock(&bond->lock);
4141         return NETDEV_TX_OK;
4142 }
4143
4144 /*------------------------- Device initialization ---------------------------*/
4145
4146 static void bond_set_xmit_hash_policy(struct bonding *bond)
4147 {
4148         switch (bond->params.xmit_policy) {
4149         case BOND_XMIT_POLICY_LAYER23:
4150                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4151                 break;
4152         case BOND_XMIT_POLICY_LAYER34:
4153                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4154                 break;
4155         case BOND_XMIT_POLICY_LAYER2:
4156         default:
4157                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4158                 break;
4159         }
4160 }
4161
4162 /*
4163  * Lookup the slave that corresponds to a qid
4164  */
4165 static inline int bond_slave_override(struct bonding *bond,
4166                                       struct sk_buff *skb)
4167 {
4168         int i, res = 1;
4169         struct slave *slave = NULL;
4170         struct slave *check_slave;
4171
4172         read_lock(&bond->lock);
4173
4174         if (!BOND_IS_OK(bond) || !skb->queue_mapping)
4175                 goto out;
4176
4177         /* Find out if any slaves have the same mapping as this skb. */
4178         bond_for_each_slave(bond, check_slave, i) {
4179                 if (check_slave->queue_id == skb->queue_mapping) {
4180                         slave = check_slave;
4181                         break;
4182                 }
4183         }
4184
4185         /* If the slave isn't UP, use default transmit policy. */
4186         if (slave && slave->queue_id && IS_UP(slave->dev) &&
4187             (slave->link == BOND_LINK_UP)) {
4188                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4189         }
4190
4191 out:
4192         read_unlock(&bond->lock);
4193         return res;
4194 }
4195
4196 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4197 {
4198         /*
4199          * This helper function exists to help dev_pick_tx get the correct
4200          * destination queue.  Using a helper function skips a call to
4201          * skb_tx_hash and will put the skbs in the queue we expect on their
4202          * way down to the bonding driver.
4203          */
4204         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4205
4206         if (unlikely(txq >= dev->real_num_tx_queues)) {
4207                 do {
4208                         txq -= dev->real_num_tx_queues;
4209                 } while (txq >= dev->real_num_tx_queues);
4210         }
4211         return txq;
4212 }
4213
4214 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4215 {
4216         struct bonding *bond = netdev_priv(dev);
4217
4218         /*
4219          * If we risk deadlock from transmitting this in the
4220          * netpoll path, tell netpoll to queue the frame for later tx
4221          */
4222         if (is_netpoll_tx_blocked(dev))
4223                 return NETDEV_TX_BUSY;
4224
4225         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4226                 if (!bond_slave_override(bond, skb))
4227                         return NETDEV_TX_OK;
4228         }
4229
4230         switch (bond->params.mode) {
4231         case BOND_MODE_ROUNDROBIN:
4232                 return bond_xmit_roundrobin(skb, dev);
4233         case BOND_MODE_ACTIVEBACKUP:
4234                 return bond_xmit_activebackup(skb, dev);
4235         case BOND_MODE_XOR:
4236                 return bond_xmit_xor(skb, dev);
4237         case BOND_MODE_BROADCAST:
4238                 return bond_xmit_broadcast(skb, dev);
4239         case BOND_MODE_8023AD:
4240                 return bond_3ad_xmit_xor(skb, dev);
4241         case BOND_MODE_ALB:
4242         case BOND_MODE_TLB:
4243                 return bond_alb_xmit(skb, dev);
4244         default:
4245                 /* Should never happen, mode already checked */
4246                 pr_err("%s: Error: Unknown bonding mode %d\n",
4247                        dev->name, bond->params.mode);
4248                 WARN_ON_ONCE(1);
4249                 dev_kfree_skb(skb);
4250                 return NETDEV_TX_OK;
4251         }
4252 }
4253
4254
4255 /*
4256  * set bond mode specific net device operations
4257  */
4258 void bond_set_mode_ops(struct bonding *bond, int mode)
4259 {
4260         struct net_device *bond_dev = bond->dev;
4261
4262         switch (mode) {
4263         case BOND_MODE_ROUNDROBIN:
4264                 break;
4265         case BOND_MODE_ACTIVEBACKUP:
4266                 break;
4267         case BOND_MODE_XOR:
4268                 bond_set_xmit_hash_policy(bond);
4269                 break;
4270         case BOND_MODE_BROADCAST:
4271                 break;
4272         case BOND_MODE_8023AD:
4273                 bond_set_xmit_hash_policy(bond);
4274                 break;
4275         case BOND_MODE_ALB:
4276                 /* FALLTHRU */
4277         case BOND_MODE_TLB:
4278                 break;
4279         default:
4280                 /* Should never happen, mode already checked */
4281                 pr_err("%s: Error: Unknown bonding mode %d\n",
4282                        bond_dev->name, mode);
4283                 break;
4284         }
4285 }
4286
4287 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4288                                     struct ethtool_drvinfo *drvinfo)
4289 {
4290         strncpy(drvinfo->driver, DRV_NAME, 32);
4291         strncpy(drvinfo->version, DRV_VERSION, 32);
4292         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4293 }
4294
4295 static const struct ethtool_ops bond_ethtool_ops = {
4296         .get_drvinfo            = bond_ethtool_get_drvinfo,
4297         .get_link               = ethtool_op_get_link,
4298         .get_tx_csum            = ethtool_op_get_tx_csum,
4299         .get_sg                 = ethtool_op_get_sg,
4300         .get_tso                = ethtool_op_get_tso,
4301         .get_ufo                = ethtool_op_get_ufo,
4302         .get_flags              = ethtool_op_get_flags,
4303 };
4304
4305 static const struct net_device_ops bond_netdev_ops = {
4306         .ndo_init               = bond_init,
4307         .ndo_uninit             = bond_uninit,
4308         .ndo_open               = bond_open,
4309         .ndo_stop               = bond_close,
4310         .ndo_start_xmit         = bond_start_xmit,
4311         .ndo_select_queue       = bond_select_queue,
4312         .ndo_get_stats64        = bond_get_stats,
4313         .ndo_do_ioctl           = bond_do_ioctl,
4314         .ndo_set_multicast_list = bond_set_multicast_list,
4315         .ndo_change_mtu         = bond_change_mtu,
4316         .ndo_set_mac_address    = bond_set_mac_address,
4317         .ndo_neigh_setup        = bond_neigh_setup,
4318         .ndo_vlan_rx_register   = bond_vlan_rx_register,
4319         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4320         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4321 #ifdef CONFIG_NET_POLL_CONTROLLER
4322         .ndo_netpoll_setup      = bond_netpoll_setup,
4323         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4324         .ndo_poll_controller    = bond_poll_controller,
4325 #endif
4326         .ndo_add_slave          = bond_enslave,
4327         .ndo_del_slave          = bond_release,
4328 };
4329
4330 static void bond_destructor(struct net_device *bond_dev)
4331 {
4332         struct bonding *bond = netdev_priv(bond_dev);
4333         if (bond->wq)
4334                 destroy_workqueue(bond->wq);
4335         free_netdev(bond_dev);
4336 }
4337
4338 static void bond_setup(struct net_device *bond_dev)
4339 {
4340         struct bonding *bond = netdev_priv(bond_dev);
4341
4342         /* initialize rwlocks */
4343         rwlock_init(&bond->lock);
4344         rwlock_init(&bond->curr_slave_lock);
4345
4346         bond->params = bonding_defaults;
4347
4348         /* Initialize pointers */
4349         bond->dev = bond_dev;
4350         INIT_LIST_HEAD(&bond->vlan_list);
4351
4352         /* Initialize the device entry points */
4353         ether_setup(bond_dev);
4354         bond_dev->netdev_ops = &bond_netdev_ops;
4355         bond_dev->ethtool_ops = &bond_ethtool_ops;
4356         bond_set_mode_ops(bond, bond->params.mode);
4357
4358         bond_dev->destructor = bond_destructor;
4359
4360         /* Initialize the device options */
4361         bond_dev->tx_queue_len = 0;
4362         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4363         bond_dev->priv_flags |= IFF_BONDING;
4364         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
4365
4366         /* At first, we block adding VLANs. That's the only way to
4367          * prevent problems that occur when adding VLANs over an
4368          * empty bond. The block will be removed once non-challenged
4369          * slaves are enslaved.
4370          */
4371         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4372
4373         /* don't acquire bond device's netif_tx_lock when
4374          * transmitting */
4375         bond_dev->features |= NETIF_F_LLTX;
4376
4377         /* By default, we declare the bond to be fully
4378          * VLAN hardware accelerated capable. Special
4379          * care is taken in the various xmit functions
4380          * when there are slaves that are not hw accel
4381          * capable
4382          */
4383         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4384                                NETIF_F_HW_VLAN_RX |
4385                                NETIF_F_HW_VLAN_FILTER);
4386
4387         /* By default, we enable GRO on bonding devices.
4388          * Actual support requires lowlevel drivers are GRO ready.
4389          */
4390         bond_dev->features |= NETIF_F_GRO;
4391 }
4392
4393 static void bond_work_cancel_all(struct bonding *bond)
4394 {
4395         write_lock_bh(&bond->lock);
4396         bond->kill_timers = 1;
4397         write_unlock_bh(&bond->lock);
4398
4399         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4400                 cancel_delayed_work(&bond->mii_work);
4401
4402         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4403                 cancel_delayed_work(&bond->arp_work);
4404
4405         if (bond->params.mode == BOND_MODE_ALB &&
4406             delayed_work_pending(&bond->alb_work))
4407                 cancel_delayed_work(&bond->alb_work);
4408
4409         if (bond->params.mode == BOND_MODE_8023AD &&
4410             delayed_work_pending(&bond->ad_work))
4411                 cancel_delayed_work(&bond->ad_work);
4412
4413         if (delayed_work_pending(&bond->mcast_work))
4414                 cancel_delayed_work(&bond->mcast_work);
4415 }
4416
4417 /*
4418 * Destroy a bonding device.
4419 * Must be under rtnl_lock when this function is called.
4420 */
4421 static void bond_uninit(struct net_device *bond_dev)
4422 {
4423         struct bonding *bond = netdev_priv(bond_dev);
4424         struct vlan_entry *vlan, *tmp;
4425
4426         bond_netpoll_cleanup(bond_dev);
4427
4428         /* Release the bonded slaves */
4429         bond_release_all(bond_dev);
4430
4431         list_del(&bond->bond_list);
4432
4433         bond_work_cancel_all(bond);
4434
4435         bond_remove_proc_entry(bond);
4436
4437         bond_debug_unregister(bond);
4438
4439         __hw_addr_flush(&bond->mc_list);
4440
4441         list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4442                 list_del(&vlan->vlan_list);
4443                 kfree(vlan);
4444         }
4445 }
4446
4447 /*------------------------- Module initialization ---------------------------*/
4448
4449 /*
4450  * Convert string input module parms.  Accept either the
4451  * number of the mode or its string name.  A bit complicated because
4452  * some mode names are substrings of other names, and calls from sysfs
4453  * may have whitespace in the name (trailing newlines, for example).
4454  */
4455 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4456 {
4457         int modeint = -1, i, rv;
4458         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4459
4460         for (p = (char *)buf; *p; p++)
4461                 if (!(isdigit(*p) || isspace(*p)))
4462                         break;
4463
4464         if (*p)
4465                 rv = sscanf(buf, "%20s", modestr);
4466         else
4467                 rv = sscanf(buf, "%d", &modeint);
4468
4469         if (!rv)
4470                 return -1;
4471
4472         for (i = 0; tbl[i].modename; i++) {
4473                 if (modeint == tbl[i].mode)
4474                         return tbl[i].mode;
4475                 if (strcmp(modestr, tbl[i].modename) == 0)
4476                         return tbl[i].mode;
4477         }
4478
4479         return -1;
4480 }
4481
4482 static int bond_check_params(struct bond_params *params)
4483 {
4484         int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4485
4486         /*
4487          * Convert string parameters.
4488          */
4489         if (mode) {
4490                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4491                 if (bond_mode == -1) {
4492                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4493                                mode == NULL ? "NULL" : mode);
4494                         return -EINVAL;
4495                 }
4496         }
4497
4498         if (xmit_hash_policy) {
4499                 if ((bond_mode != BOND_MODE_XOR) &&
4500                     (bond_mode != BOND_MODE_8023AD)) {
4501                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4502                                bond_mode_name(bond_mode));
4503                 } else {
4504                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4505                                                         xmit_hashtype_tbl);
4506                         if (xmit_hashtype == -1) {
4507                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4508                                        xmit_hash_policy == NULL ? "NULL" :
4509                                        xmit_hash_policy);
4510                                 return -EINVAL;
4511                         }
4512                 }
4513         }
4514
4515         if (lacp_rate) {
4516                 if (bond_mode != BOND_MODE_8023AD) {
4517                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4518                                 bond_mode_name(bond_mode));
4519                 } else {
4520                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4521                         if (lacp_fast == -1) {
4522                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4523                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4524                                 return -EINVAL;
4525                         }
4526                 }
4527         }
4528
4529         if (ad_select) {
4530                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4531                 if (params->ad_select == -1) {
4532                         pr_err("Error: Invalid ad_select \"%s\"\n",
4533                                ad_select == NULL ? "NULL" : ad_select);
4534                         return -EINVAL;
4535                 }
4536
4537                 if (bond_mode != BOND_MODE_8023AD) {
4538                         pr_warning("ad_select param only affects 802.3ad mode\n");
4539                 }
4540         } else {
4541                 params->ad_select = BOND_AD_STABLE;
4542         }
4543
4544         if (max_bonds < 0) {
4545                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4546                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4547                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4548         }
4549
4550         if (miimon < 0) {
4551                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4552                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4553                 miimon = BOND_LINK_MON_INTERV;
4554         }
4555
4556         if (updelay < 0) {
4557                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4558                            updelay, INT_MAX);
4559                 updelay = 0;
4560         }
4561
4562         if (downdelay < 0) {
4563                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4564                            downdelay, INT_MAX);
4565                 downdelay = 0;
4566         }
4567
4568         if ((use_carrier != 0) && (use_carrier != 1)) {
4569                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4570                            use_carrier);
4571                 use_carrier = 1;
4572         }
4573
4574         /* reset values for 802.3ad */
4575         if (bond_mode == BOND_MODE_8023AD) {
4576                 if (!miimon) {
4577                         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");
4578                         pr_warning("Forcing miimon to 100msec\n");
4579                         miimon = 100;
4580                 }
4581         }
4582
4583         if (tx_queues < 1 || tx_queues > 255) {
4584                 pr_warning("Warning: tx_queues (%d) should be between "
4585                            "1 and 255, resetting to %d\n",
4586                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4587                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4588         }
4589
4590         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4591                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4592                            "not of valid value (0/1), so it was set to "
4593                            "0\n", all_slaves_active);
4594                 all_slaves_active = 0;
4595         }
4596
4597         if (resend_igmp < 0 || resend_igmp > 255) {
4598                 pr_warning("Warning: resend_igmp (%d) should be between "
4599                            "0 and 255, resetting to %d\n",
4600                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4601                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4602         }
4603
4604         /* reset values for TLB/ALB */
4605         if ((bond_mode == BOND_MODE_TLB) ||
4606             (bond_mode == BOND_MODE_ALB)) {
4607                 if (!miimon) {
4608                         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");
4609                         pr_warning("Forcing miimon to 100msec\n");
4610                         miimon = 100;
4611                 }
4612         }
4613
4614         if (bond_mode == BOND_MODE_ALB) {
4615                 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",
4616                           updelay);
4617         }
4618
4619         if (!miimon) {
4620                 if (updelay || downdelay) {
4621                         /* just warn the user the up/down delay will have
4622                          * no effect since miimon is zero...
4623                          */
4624                         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",
4625                                    updelay, downdelay);
4626                 }
4627         } else {
4628                 /* don't allow arp monitoring */
4629                 if (arp_interval) {
4630                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4631                                    miimon, arp_interval);
4632                         arp_interval = 0;
4633                 }
4634
4635                 if ((updelay % miimon) != 0) {
4636                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4637                                    updelay, miimon,
4638                                    (updelay / miimon) * miimon);
4639                 }
4640
4641                 updelay /= miimon;
4642
4643                 if ((downdelay % miimon) != 0) {
4644                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4645                                    downdelay, miimon,
4646                                    (downdelay / miimon) * miimon);
4647                 }
4648
4649                 downdelay /= miimon;
4650         }
4651
4652         if (arp_interval < 0) {
4653                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4654                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4655                 arp_interval = BOND_LINK_ARP_INTERV;
4656         }
4657
4658         for (arp_ip_count = 0;
4659              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4660              arp_ip_count++) {
4661                 /* not complete check, but should be good enough to
4662                    catch mistakes */
4663                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4664                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4665                                    arp_ip_target[arp_ip_count]);
4666                         arp_interval = 0;
4667                 } else {
4668                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4669                         arp_target[arp_ip_count] = ip;
4670                 }
4671         }
4672
4673         if (arp_interval && !arp_ip_count) {
4674                 /* don't allow arping if no arp_ip_target given... */
4675                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4676                            arp_interval);
4677                 arp_interval = 0;
4678         }
4679
4680         if (arp_validate) {
4681                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4682                         pr_err("arp_validate only supported in active-backup mode\n");
4683                         return -EINVAL;
4684                 }
4685                 if (!arp_interval) {
4686                         pr_err("arp_validate requires arp_interval\n");
4687                         return -EINVAL;
4688                 }
4689
4690                 arp_validate_value = bond_parse_parm(arp_validate,
4691                                                      arp_validate_tbl);
4692                 if (arp_validate_value == -1) {
4693                         pr_err("Error: invalid arp_validate \"%s\"\n",
4694                                arp_validate == NULL ? "NULL" : arp_validate);
4695                         return -EINVAL;
4696                 }
4697         } else
4698                 arp_validate_value = 0;
4699
4700         if (miimon) {
4701                 pr_info("MII link monitoring set to %d ms\n", miimon);
4702         } else if (arp_interval) {
4703                 int i;
4704
4705                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4706                         arp_interval,
4707                         arp_validate_tbl[arp_validate_value].modename,
4708                         arp_ip_count);
4709
4710                 for (i = 0; i < arp_ip_count; i++)
4711                         pr_info(" %s", arp_ip_target[i]);
4712
4713                 pr_info("\n");
4714
4715         } else if (max_bonds) {
4716                 /* miimon and arp_interval not set, we need one so things
4717                  * work as expected, see bonding.txt for details
4718                  */
4719                 pr_warning("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");
4720         }
4721
4722         if (primary && !USES_PRIMARY(bond_mode)) {
4723                 /* currently, using a primary only makes sense
4724                  * in active backup, TLB or ALB modes
4725                  */
4726                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4727                            primary, bond_mode_name(bond_mode));
4728                 primary = NULL;
4729         }
4730
4731         if (primary && primary_reselect) {
4732                 primary_reselect_value = bond_parse_parm(primary_reselect,
4733                                                          pri_reselect_tbl);
4734                 if (primary_reselect_value == -1) {
4735                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4736                                primary_reselect ==
4737                                         NULL ? "NULL" : primary_reselect);
4738                         return -EINVAL;
4739                 }
4740         } else {
4741                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4742         }
4743
4744         if (fail_over_mac) {
4745                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4746                                                       fail_over_mac_tbl);
4747                 if (fail_over_mac_value == -1) {
4748                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4749                                arp_validate == NULL ? "NULL" : arp_validate);
4750                         return -EINVAL;
4751                 }
4752
4753                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4754                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4755         } else {
4756                 fail_over_mac_value = BOND_FOM_NONE;
4757         }
4758
4759         /* fill params struct with the proper values */
4760         params->mode = bond_mode;
4761         params->xmit_policy = xmit_hashtype;
4762         params->miimon = miimon;
4763         params->arp_interval = arp_interval;
4764         params->arp_validate = arp_validate_value;
4765         params->updelay = updelay;
4766         params->downdelay = downdelay;
4767         params->use_carrier = use_carrier;
4768         params->lacp_fast = lacp_fast;
4769         params->primary[0] = 0;
4770         params->primary_reselect = primary_reselect_value;
4771         params->fail_over_mac = fail_over_mac_value;
4772         params->tx_queues = tx_queues;
4773         params->all_slaves_active = all_slaves_active;
4774         params->resend_igmp = resend_igmp;
4775
4776         if (primary) {
4777                 strncpy(params->primary, primary, IFNAMSIZ);
4778                 params->primary[IFNAMSIZ - 1] = 0;
4779         }
4780
4781         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4782
4783         return 0;
4784 }
4785
4786 static struct lock_class_key bonding_netdev_xmit_lock_key;
4787 static struct lock_class_key bonding_netdev_addr_lock_key;
4788
4789 static void bond_set_lockdep_class_one(struct net_device *dev,
4790                                        struct netdev_queue *txq,
4791                                        void *_unused)
4792 {
4793         lockdep_set_class(&txq->_xmit_lock,
4794                           &bonding_netdev_xmit_lock_key);
4795 }
4796
4797 static void bond_set_lockdep_class(struct net_device *dev)
4798 {
4799         lockdep_set_class(&dev->addr_list_lock,
4800                           &bonding_netdev_addr_lock_key);
4801         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4802 }
4803
4804 /*
4805  * Called from registration process
4806  */
4807 static int bond_init(struct net_device *bond_dev)
4808 {
4809         struct bonding *bond = netdev_priv(bond_dev);
4810         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4811
4812         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4813
4814         bond->wq = create_singlethread_workqueue(bond_dev->name);
4815         if (!bond->wq)
4816                 return -ENOMEM;
4817
4818         bond_set_lockdep_class(bond_dev);
4819
4820         bond_create_proc_entry(bond);
4821         list_add_tail(&bond->bond_list, &bn->dev_list);
4822
4823         bond_prepare_sysfs_group(bond);
4824
4825         bond_debug_register(bond);
4826
4827         __hw_addr_init(&bond->mc_list);
4828         return 0;
4829 }
4830
4831 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4832 {
4833         if (tb[IFLA_ADDRESS]) {
4834                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4835                         return -EINVAL;
4836                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4837                         return -EADDRNOTAVAIL;
4838         }
4839         return 0;
4840 }
4841
4842 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4843         .kind           = "bond",
4844         .priv_size      = sizeof(struct bonding),
4845         .setup          = bond_setup,
4846         .validate       = bond_validate,
4847 };
4848
4849 /* Create a new bond based on the specified name and bonding parameters.
4850  * If name is NULL, obtain a suitable "bond%d" name for us.
4851  * Caller must NOT hold rtnl_lock; we need to release it here before we
4852  * set up our sysfs entries.
4853  */
4854 int bond_create(struct net *net, const char *name)
4855 {
4856         struct net_device *bond_dev;
4857         int res;
4858
4859         rtnl_lock();
4860
4861         bond_dev = alloc_netdev_mq(sizeof(struct bonding), name ? name : "",
4862                                 bond_setup, tx_queues);
4863         if (!bond_dev) {
4864                 pr_err("%s: eek! can't alloc netdev!\n", name);
4865                 rtnl_unlock();
4866                 return -ENOMEM;
4867         }
4868
4869         dev_net_set(bond_dev, net);
4870         bond_dev->rtnl_link_ops = &bond_link_ops;
4871
4872         if (!name) {
4873                 res = dev_alloc_name(bond_dev, "bond%d");
4874                 if (res < 0)
4875                         goto out;
4876         } else {
4877                 /*
4878                  * If we're given a name to register
4879                  * we need to ensure that its not already
4880                  * registered
4881                  */
4882                 res = -EEXIST;
4883                 if (__dev_get_by_name(net, name) != NULL)
4884                         goto out;
4885         }
4886
4887         res = register_netdevice(bond_dev);
4888
4889         netif_carrier_off(bond_dev);
4890
4891 out:
4892         rtnl_unlock();
4893         if (res < 0)
4894                 bond_destructor(bond_dev);
4895         return res;
4896 }
4897
4898 static int __net_init bond_net_init(struct net *net)
4899 {
4900         struct bond_net *bn = net_generic(net, bond_net_id);
4901
4902         bn->net = net;
4903         INIT_LIST_HEAD(&bn->dev_list);
4904
4905         bond_create_proc_dir(bn);
4906
4907         return 0;
4908 }
4909
4910 static void __net_exit bond_net_exit(struct net *net)
4911 {
4912         struct bond_net *bn = net_generic(net, bond_net_id);
4913
4914         bond_destroy_proc_dir(bn);
4915 }
4916
4917 static struct pernet_operations bond_net_ops = {
4918         .init = bond_net_init,
4919         .exit = bond_net_exit,
4920         .id   = &bond_net_id,
4921         .size = sizeof(struct bond_net),
4922 };
4923
4924 static int __init bonding_init(void)
4925 {
4926         int i;
4927         int res;
4928
4929         pr_info("%s", bond_version);
4930
4931         res = bond_check_params(&bonding_defaults);
4932         if (res)
4933                 goto out;
4934
4935         res = register_pernet_subsys(&bond_net_ops);
4936         if (res)
4937                 goto out;
4938
4939         res = rtnl_link_register(&bond_link_ops);
4940         if (res)
4941                 goto err_link;
4942
4943         bond_create_debugfs();
4944
4945         for (i = 0; i < max_bonds; i++) {
4946                 res = bond_create(&init_net, NULL);
4947                 if (res)
4948                         goto err;
4949         }
4950
4951         res = bond_create_sysfs();
4952         if (res)
4953                 goto err;
4954
4955         register_netdevice_notifier(&bond_netdev_notifier);
4956         register_inetaddr_notifier(&bond_inetaddr_notifier);
4957 out:
4958         return res;
4959 err:
4960         rtnl_link_unregister(&bond_link_ops);
4961 err_link:
4962         unregister_pernet_subsys(&bond_net_ops);
4963         goto out;
4964
4965 }
4966
4967 static void __exit bonding_exit(void)
4968 {
4969         unregister_netdevice_notifier(&bond_netdev_notifier);
4970         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4971
4972         bond_destroy_sysfs();
4973         bond_destroy_debugfs();
4974
4975         rtnl_link_unregister(&bond_link_ops);
4976         unregister_pernet_subsys(&bond_net_ops);
4977
4978 #ifdef CONFIG_NET_POLL_CONTROLLER
4979         /*
4980          * Make sure we don't have an imbalance on our netpoll blocking
4981          */
4982         WARN_ON(atomic_read(&netpoll_block_tx));
4983 #endif
4984 }
4985
4986 module_init(bonding_init);
4987 module_exit(bonding_exit);
4988 MODULE_LICENSE("GPL");
4989 MODULE_VERSION(DRV_VERSION);
4990 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4991 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4992 MODULE_ALIAS_RTNL_LINK("bond");