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         u16 ad_actor_sys_prio;
 140         u16 ad_user_port_key;
 141         u8 ad_actor_system[ETH_ALEN];
 142 };
 143
 144 struct bond_parm_tbl {
 145         char *modename;
 146         int mode;
 147 };
 148
 149 struct netdev_notify_work {
 150         struct delayed_work     work;
 151         struct net_device       *dev;
 152         struct netdev_bonding_info bonding_info;
 153 };
 154
 155 struct slave {
 156         struct net_device *dev; /* first - useful for panic debug */
 157         struct bonding *bond; /* our master */
 158         int    delay;
 159         /* all three in jiffies */
 160         unsigned long last_link_up;
 161         unsigned long last_rx;
 162         unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
 163         s8     link;    /* one of BOND_LINK_XXXX */
 164         s8     new_link;
 165         u8     backup:1,   /* indicates backup slave. Value corresponds with
 166                               BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
 167                inactive:1, /* indicates inactive slave */
 168                should_notify:1; /* indicateds whether the state changed */
 169         u8     duplex;
 170         u32    original_mtu;
 171         u32    link_failure_count;
 172         u32    speed;
 173         u16    queue_id;
 174         u8     perm_hwaddr[ETH_ALEN];
 175         struct ad_slave_info *ad_info;
 176         struct tlb_slave_info tlb_info;
 177 #ifdef CONFIG_NET_POLL_CONTROLLER
 178         struct netpoll *np;
 179 #endif
 180         struct kobject kobj;
 181         struct rtnl_link_stats64 slave_stats;
 182 };
 183
 184 struct bond_up_slave {
 185         unsigned int    count;
 186         struct rcu_head rcu;
 187         struct slave    *arr[0];
 188 };
 189
 190 /*
 191  * Link pseudo-state only used internally by monitors
 192  */
 193 #define BOND_LINK_NOCHANGE -1
 194
 195 /*
 196  * Here are the locking policies for the two bonding locks:
 197  * Get rcu_read_lock when reading or RTNL when writing slave list.
 198  */
 199 struct bonding {
 200         struct   net_device *dev; /* first - useful for panic debug */
 201         struct   slave __rcu *curr_active_slave;
 202         struct   slave __rcu *current_arp_slave;
 203         struct   slave __rcu *primary_slave;
 204         struct   bond_up_slave __rcu *slave_arr; /* Array of usable slaves */
 205         bool     force_primary;
 206         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 207         int     (*recv_probe)(const struct sk_buff *, struct bonding *,
 208                               struct slave *);
 209         /* mode_lock is used for mode-specific locking needs, currently used by:
 210          * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
 211          *                bond_3ad_state_machine_handler() concurrently and also
 212          *                the access to the state machine shared variables.
 213          * TLB mode (5) - to sync the use and modifications of its hash table
 214          * ALB mode (6) - to sync the use and modifications of its hash table
 215          */
 216         spinlock_t mode_lock;
 217         u8       send_peer_notif;
 218         u8       igmp_retrans;
 219 #ifdef CONFIG_PROC_FS
 220         struct   proc_dir_entry *proc_entry;
 221         char     proc_file_name[IFNAMSIZ];
 222 #endif /* CONFIG_PROC_FS */
 223         struct   list_head bond_list;
 224         u32      rr_tx_counter;
 225         struct   ad_bond_info ad_info;
 226         struct   alb_bond_info alb_info;
 227         struct   bond_params params;
 228         struct   workqueue_struct *wq;
 229         struct   delayed_work mii_work;
 230         struct   delayed_work arp_work;
 231         struct   delayed_work alb_work;
 232         struct   delayed_work ad_work;
 233         struct   delayed_work mcast_work;
 234         struct   delayed_work slave_arr_work;
 235 #ifdef CONFIG_DEBUG_FS
 236         /* debugging support via debugfs */
 237         struct   dentry *debug_dir;
 238 #endif /* CONFIG_DEBUG_FS */
 239         struct rtnl_link_stats64 bond_stats;
 240 };
 241
 242 #define bond_slave_get_rcu(dev) \
 243         ((struct slave *) rcu_dereference(dev->rx_handler_data))
 244
 245 #define bond_slave_get_rtnl(dev) \
 246         ((struct slave *) rtnl_dereference(dev->rx_handler_data))
 247
 248 void bond_queue_slave_event(struct slave *slave);
 249
 250 struct bond_vlan_tag {
 251         __be16          vlan_proto;
 252         unsigned short  vlan_id;
 253 };
 254
 255 /**
 256  * Returns NULL if the net_device does not belong to any of the bond's slaves
 257  *
 258  * Caller must hold bond lock for read
 259  */
 260 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
 261                                                   struct net_device *slave_dev)
 262 {
 263         return netdev_lower_dev_get_private(bond->dev, slave_dev);
 264 }
 265
 266 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 267 {
 268         return slave->bond;
 269 }
 270
 271 static inline bool bond_should_override_tx_queue(struct bonding *bond)
 272 {
 273         return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
 274                BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
 275 }
 276
 277 static inline bool bond_is_lb(const struct bonding *bond)
 278 {
 279         return BOND_MODE(bond) == BOND_MODE_TLB ||
 280                BOND_MODE(bond) == BOND_MODE_ALB;
 281 }
 282
 283 static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
 284 {
 285         return (BOND_MODE(bond) == BOND_MODE_TLB)  &&
 286                (bond->params.tlb_dynamic_lb == 0);
 287 }
 288
 289 static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)
 290 {
 291         return (BOND_MODE(bond) == BOND_MODE_8023AD ||
 292                 BOND_MODE(bond) == BOND_MODE_XOR ||
 293                 bond_is_nondyn_tlb(bond));
 294 }
 295
 296 static inline bool bond_mode_uses_arp(int mode)
 297 {
 298         return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
 299                mode != BOND_MODE_ALB;
 300 }
 301
 302 static inline bool bond_mode_uses_primary(int mode)
 303 {
 304         return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
 305                mode == BOND_MODE_ALB;
 306 }
 307
 308 static inline bool bond_uses_primary(struct bonding *bond)
 309 {
 310         return bond_mode_uses_primary(BOND_MODE(bond));
 311 }
 312
 313 static inline bool bond_slave_is_up(struct slave *slave)
 314 {
 315         return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
 316 }
 317
 318 static inline void bond_set_active_slave(struct slave *slave)
 319 {
 320         if (slave->backup) {
 321                 slave->backup = 0;
 322                 bond_queue_slave_event(slave);
 323                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 324         }
 325 }
 326
 327 static inline void bond_set_backup_slave(struct slave *slave)
 328 {
 329         if (!slave->backup) {
 330                 slave->backup = 1;
 331                 bond_queue_slave_event(slave);
 332                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 333         }
 334 }
 335
 336 static inline void bond_set_slave_state(struct slave *slave,
 337                                         int slave_state, bool notify)
 338 {
 339         if (slave->backup == slave_state)
 340                 return;
 341
 342         slave->backup = slave_state;
 343         if (notify) {
 344                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
 345                 bond_queue_slave_event(slave);
 346                 slave->should_notify = 0;
 347         } else {
 348                 if (slave->should_notify)
 349                         slave->should_notify = 0;
 350                 else
 351                         slave->should_notify = 1;
 352         }
 353 }
 354
 355 static inline void bond_slave_state_change(struct bonding *bond)
 356 {
 357         struct list_head *iter;
 358         struct slave *tmp;
 359
 360         bond_for_each_slave(bond, tmp, iter) {
 361                 if (tmp->link == BOND_LINK_UP)
 362                         bond_set_active_slave(tmp);
 363                 else if (tmp->link == BOND_LINK_DOWN)
 364                         bond_set_backup_slave(tmp);
 365         }
 366 }
 367
 368 static inline void bond_slave_state_notify(struct bonding *bond)
 369 {
 370         struct list_head *iter;
 371         struct slave *tmp;
 372
 373         bond_for_each_slave(bond, tmp, iter) {
 374                 if (tmp->should_notify) {
 375                         rtmsg_ifinfo(RTM_NEWLINK, tmp->dev, 0, GFP_ATOMIC);
 376                         tmp->should_notify = 0;
 377                 }
 378         }
 379 }
 380
 381 static inline int bond_slave_state(struct slave *slave)
 382 {
 383         return slave->backup;
 384 }
 385
 386 static inline bool bond_is_active_slave(struct slave *slave)
 387 {
 388         return !bond_slave_state(slave);
 389 }
 390
 391 static inline bool bond_slave_can_tx(struct slave *slave)
 392 {
 393         return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
 394                bond_is_active_slave(slave);
 395 }
 396
 397 #define BOND_PRI_RESELECT_ALWAYS        0
 398 #define BOND_PRI_RESELECT_BETTER        1
 399 #define BOND_PRI_RESELECT_FAILURE       2
 400
 401 #define BOND_FOM_NONE                   0
 402 #define BOND_FOM_ACTIVE                 1
 403 #define BOND_FOM_FOLLOW                 2
 404
 405 #define BOND_ARP_TARGETS_ANY            0
 406 #define BOND_ARP_TARGETS_ALL            1
 407
 408 #define BOND_ARP_VALIDATE_NONE          0
 409 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
 410 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
 411 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
 412                                          BOND_ARP_VALIDATE_BACKUP)
 413 #define BOND_ARP_FILTER                 (BOND_ARP_VALIDATE_ALL + 1)
 414 #define BOND_ARP_FILTER_ACTIVE          (BOND_ARP_VALIDATE_ACTIVE | \
 415                                          BOND_ARP_FILTER)
 416 #define BOND_ARP_FILTER_BACKUP          (BOND_ARP_VALIDATE_BACKUP | \
 417                                          BOND_ARP_FILTER)
 418
 419 #define BOND_SLAVE_NOTIFY_NOW           true
 420 #define BOND_SLAVE_NOTIFY_LATER         false
 421
 422 static inline int slave_do_arp_validate(struct bonding *bond,
 423                                         struct slave *slave)
 424 {
 425         return bond->params.arp_validate & (1 << bond_slave_state(slave));
 426 }
 427
 428 static inline int slave_do_arp_validate_only(struct bonding *bond)
 429 {
 430         return bond->params.arp_validate & BOND_ARP_FILTER;
 431 }
 432
 433 static inline int bond_is_ip_target_ok(__be32 addr)
 434 {
 435         return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
 436 }
 437
 438 /* Get the oldest arp which we've received on this slave for bond's
 439  * arp_targets.
 440  */
 441 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
 442                                                        struct slave *slave)
 443 {
 444         int i = 1;
 445         unsigned long ret = slave->target_last_arp_rx[0];
 446
 447         for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
 448                 if (time_before(slave->target_last_arp_rx[i], ret))
 449                         ret = slave->target_last_arp_rx[i];
 450
 451         return ret;
 452 }
 453
 454 static inline unsigned long slave_last_rx(struct bonding *bond,
 455                                         struct slave *slave)
 456 {
 457         if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
 458                 return slave_oldest_target_arp_rx(bond, slave);
 459
 460         return slave->last_rx;
 461 }
 462
 463 #ifdef CONFIG_NET_POLL_CONTROLLER
 464 static inline void bond_netpoll_send_skb(const struct slave *slave,
 465                                          struct sk_buff *skb)
 466 {
 467         struct netpoll *np = slave->np;
 468
 469         if (np)
 470                 netpoll_send_skb(np, skb);
 471 }
 472 #else
 473 static inline void bond_netpoll_send_skb(const struct slave *slave,
 474                                          struct sk_buff *skb)
 475 {
 476 }
 477 #endif
 478
 479 static inline void bond_set_slave_inactive_flags(struct slave *slave,
 480                                                  bool notify)
 481 {
 482         if (!bond_is_lb(slave->bond))
 483                 bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
 484         if (!slave->bond->params.all_slaves_active)
 485                 slave->inactive = 1;
 486 }
 487
 488 static inline void bond_set_slave_active_flags(struct slave *slave,
 489                                                bool notify)
 490 {
 491         bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
 492         slave->inactive = 0;
 493 }
 494
 495 static inline bool bond_is_slave_inactive(struct slave *slave)
 496 {
 497         return slave->inactive;
 498 }
 499
 500 static inline void bond_set_slave_link_state(struct slave *slave, int state)
 501 {
 502         slave->link = state;
 503         bond_queue_slave_event(slave);
 504 }
 505
 506 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
 507 {
 508         struct in_device *in_dev;
 509         __be32 addr = 0;
 510
 511         rcu_read_lock();
 512         in_dev = __in_dev_get_rcu(dev);
 513
 514         if (in_dev)
 515                 addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
 516                                          RT_SCOPE_HOST);
 517         rcu_read_unlock();
 518         return addr;
 519 }
 520
 521 struct bond_net {
 522         struct net              *net;   /* Associated network namespace */
 523         struct list_head        dev_list;
 524 #ifdef CONFIG_PROC_FS
 525         struct proc_dir_entry   *proc_dir;
 526 #endif
 527         struct class_attribute  class_attr_bonding_masters;
 528 };
 529
 530 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
 531 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 532 int bond_create(struct net *net, const char *name);
 533 int bond_create_sysfs(struct bond_net *net);
 534 void bond_destroy_sysfs(struct bond_net *net);
 535 void bond_prepare_sysfs_group(struct bonding *bond);
 536 int bond_sysfs_slave_add(struct slave *slave);
 537 void bond_sysfs_slave_del(struct slave *slave);
 538 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
 539 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 540 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
 541 int bond_set_carrier(struct bonding *bond);
 542 void bond_select_active_slave(struct bonding *bond);
 543 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 544 void bond_create_debugfs(void);
 545 void bond_destroy_debugfs(void);
 546 void bond_debug_register(struct bonding *bond);
 547 void bond_debug_unregister(struct bonding *bond);
 548 void bond_debug_reregister(struct bonding *bond);
 549 const char *bond_mode_name(int mode);
 550 void bond_setup(struct net_device *bond_dev);
 551 unsigned int bond_get_num_tx_queues(void);
 552 int bond_netlink_init(void);
 553 void bond_netlink_fini(void);
 554 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
 555 const char *bond_slave_link_status(s8 link);
 556 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
 557                                               struct net_device *end_dev,
 558                                               int level);
 559 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
 560 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
 561
 562 #ifdef CONFIG_PROC_FS
 563 void bond_create_proc_entry(struct bonding *bond);
 564 void bond_remove_proc_entry(struct bonding *bond);
 565 void bond_create_proc_dir(struct bond_net *bn);
 566 void bond_destroy_proc_dir(struct bond_net *bn);
 567 #else
 568 static inline void bond_create_proc_entry(struct bonding *bond)
 569 {
 570 }
 571
 572 static inline void bond_remove_proc_entry(struct bonding *bond)
 573 {
 574 }
 575
 576 static inline void bond_create_proc_dir(struct bond_net *bn)
 577 {
 578 }
 579
 580 static inline void bond_destroy_proc_dir(struct bond_net *bn)
 581 {
 582 }
 583 #endif
 584
 585 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
 586                                                const u8 *mac)
 587 {
 588         struct list_head *iter;
 589         struct slave *tmp;
 590
 591         bond_for_each_slave(bond, tmp, iter)
 592                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 593                         return tmp;
 594
 595         return NULL;
 596 }
 597
 598 /* Caller must hold rcu_read_lock() for read */
 599 static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
 600                                                const u8 *mac)
 601 {
 602         struct list_head *iter;
 603         struct slave *tmp;
 604
 605         bond_for_each_slave_rcu(bond, tmp, iter)
 606                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 607                         return tmp;
 608
 609         return NULL;
 610 }
 611
 612 /* Caller must hold rcu_read_lock() for read */
 613 static inline bool bond_slave_has_mac_rx(struct bonding *bond, const u8 *mac)
 614 {
 615         struct list_head *iter;
 616         struct slave *tmp;
 617         struct netdev_hw_addr *ha;
 618
 619         bond_for_each_slave_rcu(bond, tmp, iter)
 620                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 621                         return true;
 622
 623         if (netdev_uc_empty(bond->dev))
 624                 return false;
 625
 626         netdev_for_each_uc_addr(ha, bond->dev)
 627                 if (ether_addr_equal_64bits(mac, ha->addr))
 628                         return true;
 629
 630         return false;
 631 }
 632
 633 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
 634  * Returns -1 if not found, index if found
 635  */
 636 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
 637 {
 638         int i;
 639
 640         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
 641                 if (targets[i] == ip)
 642                         return i;
 643                 else if (targets[i] == 0)
 644                         break;
 645
 646         return -1;
 647 }
 648
 649 /* exported from bond_main.c */
 650 extern int bond_net_id;
 651 extern const struct bond_parm_tbl bond_lacp_tbl[];
 652 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
 653 extern const struct bond_parm_tbl arp_validate_tbl[];
 654 extern const struct bond_parm_tbl arp_all_targets_tbl[];
 655 extern const struct bond_parm_tbl fail_over_mac_tbl[];
 656 extern const struct bond_parm_tbl pri_reselect_tbl[];
 657 extern struct bond_parm_tbl ad_select_tbl[];
 658
 659 /* exported from bond_netlink.c */
 660 extern struct rtnl_link_ops bond_link_ops;
 661
 662 static inline void bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
 663 {
 664         atomic_long_inc(&dev->tx_dropped);
 665         dev_kfree_skb_any(skb);
 666 }
 667
 668 #endif /* _NET_BONDING_H */