include/net/bonding.h

   1 /*
   2  * Bond several ethernet interfaces into a Cisco, running 'Etherchannel'.
   3  *
   4  * Portions are (c) Copyright 1995 Simon "Guru Aleph-Null" Janes
   5  * NCM: Network and Communications Management, Inc.
   6  *
   7  * BUT, I'm the one who modified it for ethernet, so:
   8  * (c) Copyright 1999, Thomas Davis, tadavis@lbl.gov
   9  *
  10  *      This software may be used and distributed according to the terms
  11  *      of the GNU Public License, incorporated herein by reference.
  12  *
  13  */
  14
  15 #ifndef _NET_BONDING_H
  16 #define _NET_BONDING_H
  17
  18 #include <linux/timer.h>
  19 #include <linux/proc_fs.h>
  20 #include <linux/if_bonding.h>
  21 #include <linux/cpumask.h>
  22 #include <linux/in6.h>
  23 #include <linux/netpoll.h>
  24 #include <linux/inetdevice.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/reciprocal_div.h>
  27 #include <linux/if_link.h>
  28
  29 #include <net/bond_3ad.h>
  30 #include <net/bond_alb.h>
  31 #include <net/bond_options.h>
  32
  33 #define BOND_MAX_ARP_TARGETS    16
  34
  35 #define BOND_DEFAULT_MIIMON     100
  36
  37 /*
  38  * Less bad way to call ioctl from within the kernel; this needs to be
  39  * done some other way to get the call out of interrupt context.
  40  * Needs "ioctl" variable to be supplied by calling context.
  41  */
  42 #define IOCTL(dev, arg, cmd) ({         \
  43         int res = 0;                    \
  44         mm_segment_t fs = get_fs();     \
  45         set_fs(get_ds());               \
  46         res = ioctl(dev, arg, cmd);     \
  47         set_fs(fs);                     \
  48         res; })
  49
  50 #define BOND_MODE(bond) ((bond)->params.mode)
  51
  52 /* slave list primitives */
  53 #define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
  54
  55 #define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
  56
  57 /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
  58 #define bond_first_slave(bond) \
  59         (bond_has_slaves(bond) ? \
  60                 netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
  61                 NULL)
  62 #define bond_last_slave(bond) \
  63         (bond_has_slaves(bond) ? \
  64                 netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
  65                 NULL)
  66
  67 /* Caller must have rcu_read_lock */
  68 #define bond_first_slave_rcu(bond) \
  69         netdev_lower_get_first_private_rcu(bond->dev)
  70
  71 #define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
  72 #define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
  73
  74 /**
  75  * bond_for_each_slave - iterate over all slaves
  76  * @bond:       the bond holding this list
  77  * @pos:        current slave
  78  * @iter:       list_head * iterator
  79  *
  80  * Caller must hold RTNL
  81  */
  82 #define bond_for_each_slave(bond, pos, iter) \
  83         netdev_for_each_lower_private((bond)->dev, pos, iter)
  84
  85 /* Caller must have rcu_read_lock */
  86 #define bond_for_each_slave_rcu(bond, pos, iter) \
  87         netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
  88
  89 #ifdef CONFIG_NET_POLL_CONTROLLER
  90 extern atomic_t netpoll_block_tx;
  91
  92 static inline void block_netpoll_tx(void)
  93 {
  94         atomic_inc(&netpoll_block_tx);
  95 }
  96
  97 static inline void unblock_netpoll_tx(void)
  98 {
  99         atomic_dec(&netpoll_block_tx);
 100 }
 101
 102 static inline int is_netpoll_tx_blocked(struct net_device *dev)
 103 {
 104         if (unlikely(netpoll_tx_running(dev)))
 105                 return atomic_read(&netpoll_block_tx);
 106         return 0;
 107 }
 108 #else
 109 #define block_netpoll_tx()
 110 #define unblock_netpoll_tx()
 111 #define is_netpoll_tx_blocked(dev) (0)
 112 #endif
 113
 114 struct bond_params {
 115         int mode;
 116         int xmit_policy;
 117         int miimon;
 118         u8 num_peer_notif;
 119         int arp_interval;
 120         int arp_validate;
 121         int arp_all_targets;
 122         int use_carrier;
 123         int fail_over_mac;
 124         int updelay;
 125         int downdelay;
 126         int lacp_fast;
 127         unsigned int min_links;
 128         int ad_select;
 129         char primary[IFNAMSIZ];
 130         int primary_reselect;
 131         __be32 arp_targets[BOND_MAX_ARP_TARGETS];
 132         int tx_queues;
 133         int all_slaves_active;
 134         int resend_igmp;
 135         int lp_interval;
 136         int packets_per_slave;
 137         int tlb_dynamic_lb;
 138         struct reciprocal_value reciprocal_packets_per_slave;
 139 };
 140
 141 struct bond_parm_tbl {
 142         char *modename;
 143         int mode;
 144 };
 145
 146 struct netdev_notify_work {
 147         struct delayed_work     work;
 148         struct net_device       *dev;
 149         struct netdev_bonding_info bonding_info;
 150 };
 151
 152 struct slave {
 153         struct net_device *dev; /* first - useful for panic debug */
 154         struct bonding *bond; /* our master */
 155         int    delay;
 156         /* all three in jiffies */
 157         unsigned long last_link_up;
 158         unsigned long last_rx;
 159         unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
 160         s8     link;    /* one of BOND_LINK_XXXX */
 161         s8     new_link;
 162         u8     backup:1,   /* indicates backup slave. Value corresponds with
 163                               BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
 164                inactive:1, /* indicates inactive slave */
 165                should_notify:1; /* indicateds whether the state changed */
 166         u8     duplex;
 167         u32    original_mtu;
 168         u32    link_failure_count;
 169         u32    speed;
 170         u16    queue_id;
 171         u8     perm_hwaddr[ETH_ALEN];
 172         struct ad_slave_info *ad_info;
 173         struct tlb_slave_info tlb_info;
 174 #ifdef CONFIG_NET_POLL_CONTROLLER
 175         struct netpoll *np;
 176 #endif
 177         struct kobject kobj;
 178         struct rtnl_link_stats64 slave_stats;
 179 };
 180
 181 struct bond_up_slave {
 182         unsigned int    count;
 183         struct rcu_head rcu;
 184         struct slave    *arr[0];
 185 };
 186
 187 /*
 188  * Link pseudo-state only used internally by monitors
 189  */
 190 #define BOND_LINK_NOCHANGE -1
 191
 192 /*
 193  * Here are the locking policies for the two bonding locks:
 194  * Get rcu_read_lock when reading or RTNL when writing slave list.
 195  */
 196 struct bonding {
 197         struct   net_device *dev; /* first - useful for panic debug */
 198         struct   slave __rcu *curr_active_slave;
 199         struct   slave __rcu *current_arp_slave;
 200         struct   slave __rcu *primary_slave;
 201         struct   bond_up_slave __rcu *slave_arr; /* Array of usable slaves */
 202         bool     force_primary;
 203         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 204         int     (*recv_probe)(const struct sk_buff *, struct bonding *,
 205                               struct slave *);
 206         /* mode_lock is used for mode-specific locking needs, currently used by:
 207          * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
 208          *                bond_3ad_state_machine_handler() concurrently and also
 209          *                the access to the state machine shared variables.
 210          * TLB mode (5) - to sync the use and modifications of its hash table
 211          * ALB mode (6) - to sync the use and modifications of its hash table
 212          */
 213         spinlock_t mode_lock;
 214         u8       send_peer_notif;
 215         u8       igmp_retrans;
 216 #ifdef CONFIG_PROC_FS
 217         struct   proc_dir_entry *proc_entry;
 218         char     proc_file_name[IFNAMSIZ];
 219 #endif /* CONFIG_PROC_FS */
 220         struct   list_head bond_list;
 221         u32      rr_tx_counter;
 222         struct   ad_bond_info ad_info;
 223         struct   alb_bond_info alb_info;
 224         struct   bond_params params;
 225         struct   workqueue_struct *wq;
 226         struct   delayed_work mii_work;
 227         struct   delayed_work arp_work;
 228         struct   delayed_work alb_work;
 229         struct   delayed_work ad_work;
 230         struct   delayed_work mcast_work;
 231         struct   delayed_work slave_arr_work;
 232 #ifdef CONFIG_DEBUG_FS
 233         /* debugging support via debugfs */
 234         struct   dentry *debug_dir;
 235 #endif /* CONFIG_DEBUG_FS */
 236         struct rtnl_link_stats64 bond_stats;
 237 };
 238
 239 #define bond_slave_get_rcu(dev) \
 240         ((struct slave *) rcu_dereference(dev->rx_handler_data))
 241
 242 #define bond_slave_get_rtnl(dev) \
 243         ((struct slave *) rtnl_dereference(dev->rx_handler_data))
 244
 245 void bond_queue_slave_event(struct slave *slave);
 246
 247 struct bond_vlan_tag {
 248         __be16          vlan_proto;
 249         unsigned short  vlan_id;
 250 };
 251
 252 /**
 253  * Returns NULL if the net_device does not belong to any of the bond's slaves
 254  *
 255  * Caller must hold bond lock for read
 256  */
 257 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
 258                                                   struct net_device *slave_dev)
 259 {
 260         return netdev_lower_dev_get_private(bond->dev, slave_dev);
 261 }
 262
 263 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 264 {
 265         return slave->bond;
 266 }
 267
 268 static inline bool bond_should_override_tx_queue(struct bonding *bond)
 269 {
 270         return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
 271                BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
 272 }
 273
 274 static inline bool bond_is_lb(const struct bonding *bond)
 275 {
 276         return BOND_MODE(bond) == BOND_MODE_TLB ||
 277                BOND_MODE(bond) == BOND_MODE_ALB;
 278 }
 279
 280 static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
 281 {
 282         return (BOND_MODE(bond) == BOND_MODE_TLB)  &&
 283                (bond->params.tlb_dynamic_lb == 0);
 284 }
 285
 286 static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)
 287 {
 288         return (BOND_MODE(bond) == BOND_MODE_8023AD ||
 289                 BOND_MODE(bond) == BOND_MODE_XOR ||
 290                 bond_is_nondyn_tlb(bond));
 291 }
 292
 293 static inline bool bond_mode_uses_arp(int mode)
 294 {
 295         return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
 296                mode != BOND_MODE_ALB;
 297 }
 298
 299 static inline bool bond_mode_uses_primary(int mode)
 300 {
 301         return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
 302                mode == BOND_MODE_ALB;
 303 }
 304
 305 static inline bool bond_uses_primary(struct bonding *bond)
 306 {
 307         return bond_mode_uses_primary(BOND_MODE(bond));
 308 }
 309
 310 static inline bool bond_slave_is_up(struct slave *slave)
 311 {
 312         return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
 313 }
 314
 315 static inline void bond_set_active_slave(struct slave *slave)
 316 {
 317         if (slave->backup) {
 318                 slave->backup = 0;
 319                 bond_queue_slave_event(slave);
 320                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 321         }
 322 }
 323
 324 static inline void bond_set_backup_slave(struct slave *slave)
 325 {
 326         if (!slave->backup) {
 327                 slave->backup = 1;
 328                 bond_queue_slave_event(slave);
 329                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 330         }
 331 }
 332
 333 static inline void bond_set_slave_state(struct slave *slave,
 334                                         int slave_state, bool notify)
 335 {
 336         if (slave->backup == slave_state)
 337                 return;
 338
 339         slave->backup = slave_state;
 340         if (notify) {
 341                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 342                 bond_queue_slave_event(slave);
 343                 slave->should_notify = 0;
 344         } else {
 345                 if (slave->should_notify)
 346                         slave->should_notify = 0;
 347                 else
 348                         slave->should_notify = 1;
 349         }
 350 }
 351
 352 static inline void bond_slave_state_change(struct bonding *bond)
 353 {
 354         struct list_head *iter;
 355         struct slave *tmp;
 356
 357         bond_for_each_slave(bond, tmp, iter) {
 358                 if (tmp->link == BOND_LINK_UP)
 359                         bond_set_active_slave(tmp);
 360                 else if (tmp->link == BOND_LINK_DOWN)
 361                         bond_set_backup_slave(tmp);
 362         }
 363 }
 364
 365 static inline void bond_slave_state_notify(struct bonding *bond)
 366 {
 367         struct list_head *iter;
 368         struct slave *tmp;
 369
 370         bond_for_each_slave(bond, tmp, iter) {
 371                 if (tmp->should_notify) {
 372                         rtmsg_ifinfo(RTM_NEWLINK, tmp->dev, 0, GFP_ATOMIC);
 373                         tmp->should_notify = 0;
 374                 }
 375         }
 376 }
 377
 378 static inline int bond_slave_state(struct slave *slave)
 379 {
 380         return slave->backup;
 381 }
 382
 383 static inline bool bond_is_active_slave(struct slave *slave)
 384 {
 385         return !bond_slave_state(slave);
 386 }
 387
 388 static inline bool bond_slave_can_tx(struct slave *slave)
 389 {
 390         return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
 391                bond_is_active_slave(slave);
 392 }
 393
 394 #define BOND_PRI_RESELECT_ALWAYS        0
 395 #define BOND_PRI_RESELECT_BETTER        1
 396 #define BOND_PRI_RESELECT_FAILURE       2
 397
 398 #define BOND_FOM_NONE                   0
 399 #define BOND_FOM_ACTIVE                 1
 400 #define BOND_FOM_FOLLOW                 2
 401
 402 #define BOND_ARP_TARGETS_ANY            0
 403 #define BOND_ARP_TARGETS_ALL            1
 404
 405 #define BOND_ARP_VALIDATE_NONE          0
 406 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
 407 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
 408 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
 409                                          BOND_ARP_VALIDATE_BACKUP)
 410 #define BOND_ARP_FILTER                 (BOND_ARP_VALIDATE_ALL + 1)
 411 #define BOND_ARP_FILTER_ACTIVE          (BOND_ARP_VALIDATE_ACTIVE | \
 412                                          BOND_ARP_FILTER)
 413 #define BOND_ARP_FILTER_BACKUP          (BOND_ARP_VALIDATE_BACKUP | \
 414                                          BOND_ARP_FILTER)
 415
 416 #define BOND_SLAVE_NOTIFY_NOW           true
 417 #define BOND_SLAVE_NOTIFY_LATER         false
 418
 419 static inline int slave_do_arp_validate(struct bonding *bond,
 420                                         struct slave *slave)
 421 {
 422         return bond->params.arp_validate & (1 << bond_slave_state(slave));
 423 }
 424
 425 static inline int slave_do_arp_validate_only(struct bonding *bond)
 426 {
 427         return bond->params.arp_validate & BOND_ARP_FILTER;
 428 }
 429
 430 static inline int bond_is_ip_target_ok(__be32 addr)
 431 {
 432         return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
 433 }
 434
 435 /* Get the oldest arp which we've received on this slave for bond's
 436  * arp_targets.
 437  */
 438 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
 439                                                        struct slave *slave)
 440 {
 441         int i = 1;
 442         unsigned long ret = slave->target_last_arp_rx[0];
 443
 444         for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
 445                 if (time_before(slave->target_last_arp_rx[i], ret))
 446                         ret = slave->target_last_arp_rx[i];
 447
 448         return ret;
 449 }
 450
 451 static inline unsigned long slave_last_rx(struct bonding *bond,
 452                                         struct slave *slave)
 453 {
 454         if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
 455                 return slave_oldest_target_arp_rx(bond, slave);
 456
 457         return slave->last_rx;
 458 }
 459
 460 #ifdef CONFIG_NET_POLL_CONTROLLER
 461 static inline void bond_netpoll_send_skb(const struct slave *slave,
 462                                          struct sk_buff *skb)
 463 {
 464         struct netpoll *np = slave->np;
 465
 466         if (np)
 467                 netpoll_send_skb(np, skb);
 468 }
 469 #else
 470 static inline void bond_netpoll_send_skb(const struct slave *slave,
 471                                          struct sk_buff *skb)
 472 {
 473 }
 474 #endif
 475
 476 static inline void bond_set_slave_inactive_flags(struct slave *slave,
 477                                                  bool notify)
 478 {
 479         if (!bond_is_lb(slave->bond))
 480                 bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
 481         if (!slave->bond->params.all_slaves_active)
 482                 slave->inactive = 1;
 483 }
 484
 485 static inline void bond_set_slave_active_flags(struct slave *slave,
 486                                                bool notify)
 487 {
 488         bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
 489         slave->inactive = 0;
 490 }
 491
 492 static inline bool bond_is_slave_inactive(struct slave *slave)
 493 {
 494         return slave->inactive;
 495 }
 496
 497 static inline void bond_set_slave_link_state(struct slave *slave, int state)
 498 {
 499         slave->link = state;
 500         bond_queue_slave_event(slave);
 501 }
 502
 503 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
 504 {
 505         struct in_device *in_dev;
 506         __be32 addr = 0;
 507
 508         rcu_read_lock();
 509         in_dev = __in_dev_get_rcu(dev);
 510
 511         if (in_dev)
 512                 addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
 513                                          RT_SCOPE_HOST);
 514         rcu_read_unlock();
 515         return addr;
 516 }
 517
 518 struct bond_net {
 519         struct net              *net;   /* Associated network namespace */
 520         struct list_head        dev_list;
 521 #ifdef CONFIG_PROC_FS
 522         struct proc_dir_entry   *proc_dir;
 523 #endif
 524         struct class_attribute  class_attr_bonding_masters;
 525 };
 526
 527 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
 528 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 529 int bond_create(struct net *net, const char *name);
 530 int bond_create_sysfs(struct bond_net *net);
 531 void bond_destroy_sysfs(struct bond_net *net);
 532 void bond_prepare_sysfs_group(struct bonding *bond);
 533 int bond_sysfs_slave_add(struct slave *slave);
 534 void bond_sysfs_slave_del(struct slave *slave);
 535 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
 536 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 537 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
 538 int bond_set_carrier(struct bonding *bond);
 539 void bond_select_active_slave(struct bonding *bond);
 540 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 541 void bond_create_debugfs(void);
 542 void bond_destroy_debugfs(void);
 543 void bond_debug_register(struct bonding *bond);
 544 void bond_debug_unregister(struct bonding *bond);
 545 void bond_debug_reregister(struct bonding *bond);
 546 const char *bond_mode_name(int mode);
 547 void bond_setup(struct net_device *bond_dev);
 548 unsigned int bond_get_num_tx_queues(void);
 549 int bond_netlink_init(void);
 550 void bond_netlink_fini(void);
 551 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
 552 const char *bond_slave_link_status(s8 link);
 553 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
 554                                               struct net_device *end_dev,
 555                                               int level);
 556 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
 557 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
 558
 559 #ifdef CONFIG_PROC_FS
 560 void bond_create_proc_entry(struct bonding *bond);
 561 void bond_remove_proc_entry(struct bonding *bond);
 562 void bond_create_proc_dir(struct bond_net *bn);
 563 void bond_destroy_proc_dir(struct bond_net *bn);
 564 #else
 565 static inline void bond_create_proc_entry(struct bonding *bond)
 566 {
 567 }
 568
 569 static inline void bond_remove_proc_entry(struct bonding *bond)
 570 {
 571 }
 572
 573 static inline void bond_create_proc_dir(struct bond_net *bn)
 574 {
 575 }
 576
 577 static inline void bond_destroy_proc_dir(struct bond_net *bn)
 578 {
 579 }
 580 #endif
 581
 582 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
 583                                                const u8 *mac)
 584 {
 585         struct list_head *iter;
 586         struct slave *tmp;
 587
 588         bond_for_each_slave(bond, tmp, iter)
 589                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 590                         return tmp;
 591
 592         return NULL;
 593 }
 594
 595 /* Caller must hold rcu_read_lock() for read */
 596 static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
 597                                                const u8 *mac)
 598 {
 599         struct list_head *iter;
 600         struct slave *tmp;
 601
 602         bond_for_each_slave_rcu(bond, tmp, iter)
 603                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 604                         return tmp;
 605
 606         return NULL;
 607 }
 608
 609 /* Caller must hold rcu_read_lock() for read */
 610 static inline bool bond_slave_has_mac_rx(struct bonding *bond, const u8 *mac)
 611 {
 612         struct list_head *iter;
 613         struct slave *tmp;
 614         struct netdev_hw_addr *ha;
 615
 616         bond_for_each_slave_rcu(bond, tmp, iter)
 617                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 618                         return true;
 619
 620         if (netdev_uc_empty(bond->dev))
 621                 return false;
 622
 623         netdev_for_each_uc_addr(ha, bond->dev)
 624                 if (ether_addr_equal_64bits(mac, ha->addr))
 625                         return true;
 626
 627         return false;
 628 }
 629
 630 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
 631  * Returns -1 if not found, index if found
 632  */
 633 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
 634 {
 635         int i;
 636
 637         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
 638                 if (targets[i] == ip)
 639                         return i;
 640                 else if (targets[i] == 0)
 641                         break;
 642
 643         return -1;
 644 }
 645
 646 /* exported from bond_main.c */
 647 extern int bond_net_id;
 648 extern const struct bond_parm_tbl bond_lacp_tbl[];
 649 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
 650 extern const struct bond_parm_tbl arp_validate_tbl[];
 651 extern const struct bond_parm_tbl arp_all_targets_tbl[];
 652 extern const struct bond_parm_tbl fail_over_mac_tbl[];
 653 extern const struct bond_parm_tbl pri_reselect_tbl[];
 654 extern struct bond_parm_tbl ad_select_tbl[];
 655
 656 /* exported from bond_netlink.c */
 657 extern struct rtnl_link_ops bond_link_ops;
 658
 659 static inline void bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
 660 {
 661         atomic_long_inc(&dev->tx_dropped);
 662         dev_kfree_skb_any(skb);
 663 }
 664
 665 #endif /* _NET_BONDING_H */