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TOMOYO Linux Cross Reference
Linux/include/net/bonding.h

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  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 #ifndef __long_aligned
 38 #define __long_aligned __attribute__((aligned((sizeof(long)))))
 39 #endif
 40 
 41 #define BOND_MODE(bond) ((bond)->params.mode)
 42 
 43 /* slave list primitives */
 44 #define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
 45 
 46 #define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
 47 
 48 /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
 49 #define bond_first_slave(bond) \
 50         (bond_has_slaves(bond) ? \
 51                 netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
 52                 NULL)
 53 #define bond_last_slave(bond) \
 54         (bond_has_slaves(bond) ? \
 55                 netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
 56                 NULL)
 57 
 58 /* Caller must have rcu_read_lock */
 59 #define bond_first_slave_rcu(bond) \
 60         netdev_lower_get_first_private_rcu(bond->dev)
 61 
 62 #define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
 63 #define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
 64 
 65 /**
 66  * bond_for_each_slave - iterate over all slaves
 67  * @bond:       the bond holding this list
 68  * @pos:        current slave
 69  * @iter:       list_head * iterator
 70  *
 71  * Caller must hold RTNL
 72  */
 73 #define bond_for_each_slave(bond, pos, iter) \
 74         netdev_for_each_lower_private((bond)->dev, pos, iter)
 75 
 76 /* Caller must have rcu_read_lock */
 77 #define bond_for_each_slave_rcu(bond, pos, iter) \
 78         netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
 79 
 80 #ifdef CONFIG_NET_POLL_CONTROLLER
 81 extern atomic_t netpoll_block_tx;
 82 
 83 static inline void block_netpoll_tx(void)
 84 {
 85         atomic_inc(&netpoll_block_tx);
 86 }
 87 
 88 static inline void unblock_netpoll_tx(void)
 89 {
 90         atomic_dec(&netpoll_block_tx);
 91 }
 92 
 93 static inline int is_netpoll_tx_blocked(struct net_device *dev)
 94 {
 95         if (unlikely(netpoll_tx_running(dev)))
 96                 return atomic_read(&netpoll_block_tx);
 97         return 0;
 98 }
 99 #else
100 #define block_netpoll_tx()
101 #define unblock_netpoll_tx()
102 #define is_netpoll_tx_blocked(dev) (0)
103 #endif
104 
105 struct bond_params {
106         int mode;
107         int xmit_policy;
108         int miimon;
109         u8 num_peer_notif;
110         int arp_interval;
111         int arp_validate;
112         int arp_all_targets;
113         int use_carrier;
114         int fail_over_mac;
115         int updelay;
116         int downdelay;
117         int lacp_fast;
118         unsigned int min_links;
119         int ad_select;
120         char primary[IFNAMSIZ];
121         int primary_reselect;
122         __be32 arp_targets[BOND_MAX_ARP_TARGETS];
123         int tx_queues;
124         int all_slaves_active;
125         int resend_igmp;
126         int lp_interval;
127         int packets_per_slave;
128         int tlb_dynamic_lb;
129         struct reciprocal_value reciprocal_packets_per_slave;
130         u16 ad_actor_sys_prio;
131         u16 ad_user_port_key;
132 
133         /* 2 bytes of padding : see ether_addr_equal_64bits() */
134         u8 ad_actor_system[ETH_ALEN + 2];
135 };
136 
137 struct bond_parm_tbl {
138         char *modename;
139         int mode;
140 };
141 
142 struct netdev_notify_work {
143         struct delayed_work     work;
144         struct net_device       *dev;
145         struct netdev_bonding_info bonding_info;
146 };
147 
148 struct slave {
149         struct net_device *dev; /* first - useful for panic debug */
150         struct bonding *bond; /* our master */
151         int    delay;
152         /* all three in jiffies */
153         unsigned long last_link_up;
154         unsigned long last_rx;
155         unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
156         s8     link;    /* one of BOND_LINK_XXXX */
157         s8     new_link;
158         u8     backup:1,   /* indicates backup slave. Value corresponds with
159                               BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
160                inactive:1, /* indicates inactive slave */
161                should_notify:1, /* indicates whether the state changed */
162                should_notify_link:1; /* indicates whether the link changed */
163         u8     duplex;
164         u32    original_mtu;
165         u32    link_failure_count;
166         u32    speed;
167         u16    queue_id;
168         u8     perm_hwaddr[ETH_ALEN];
169         struct ad_slave_info *ad_info;
170         struct tlb_slave_info tlb_info;
171 #ifdef CONFIG_NET_POLL_CONTROLLER
172         struct netpoll *np;
173 #endif
174         struct kobject kobj;
175         struct rtnl_link_stats64 slave_stats;
176 };
177 
178 struct bond_up_slave {
179         unsigned int    count;
180         struct rcu_head rcu;
181         struct slave    *arr[0];
182 };
183 
184 /*
185  * Link pseudo-state only used internally by monitors
186  */
187 #define BOND_LINK_NOCHANGE -1
188 
189 /*
190  * Here are the locking policies for the two bonding locks:
191  * Get rcu_read_lock when reading or RTNL when writing slave list.
192  */
193 struct bonding {
194         struct   net_device *dev; /* first - useful for panic debug */
195         struct   slave __rcu *curr_active_slave;
196         struct   slave __rcu *current_arp_slave;
197         struct   slave __rcu *primary_slave;
198         struct   bond_up_slave __rcu *slave_arr; /* Array of usable slaves */
199         bool     force_primary;
200         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
201         int     (*recv_probe)(const struct sk_buff *, struct bonding *,
202                               struct slave *);
203         /* mode_lock is used for mode-specific locking needs, currently used by:
204          * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
205          *                bond_3ad_state_machine_handler() concurrently and also
206          *                the access to the state machine shared variables.
207          * TLB mode (5) - to sync the use and modifications of its hash table
208          * ALB mode (6) - to sync the use and modifications of its hash table
209          */
210         spinlock_t mode_lock;
211         spinlock_t stats_lock;
212         u8       send_peer_notif;
213         u8       igmp_retrans;
214 #ifdef CONFIG_PROC_FS
215         struct   proc_dir_entry *proc_entry;
216         char     proc_file_name[IFNAMSIZ];
217 #endif /* CONFIG_PROC_FS */
218         struct   list_head bond_list;
219         u32      rr_tx_counter;
220         struct   ad_bond_info ad_info;
221         struct   alb_bond_info alb_info;
222         struct   bond_params params;
223         struct   workqueue_struct *wq;
224         struct   delayed_work mii_work;
225         struct   delayed_work arp_work;
226         struct   delayed_work alb_work;
227         struct   delayed_work ad_work;
228         struct   delayed_work mcast_work;
229         struct   delayed_work slave_arr_work;
230 #ifdef CONFIG_DEBUG_FS
231         /* debugging support via debugfs */
232         struct   dentry *debug_dir;
233 #endif /* CONFIG_DEBUG_FS */
234         struct rtnl_link_stats64 bond_stats;
235 };
236 
237 #define bond_slave_get_rcu(dev) \
238         ((struct slave *) rcu_dereference(dev->rx_handler_data))
239 
240 #define bond_slave_get_rtnl(dev) \
241         ((struct slave *) rtnl_dereference(dev->rx_handler_data))
242 
243 void bond_queue_slave_event(struct slave *slave);
244 void bond_lower_state_changed(struct slave *slave);
245 
246 struct bond_vlan_tag {
247         __be16          vlan_proto;
248         unsigned short  vlan_id;
249 };
250 
251 /**
252  * Returns NULL if the net_device does not belong to any of the bond's slaves
253  *
254  * Caller must hold bond lock for read
255  */
256 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
257                                                   struct net_device *slave_dev)
258 {
259         return netdev_lower_dev_get_private(bond->dev, slave_dev);
260 }
261 
262 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
263 {
264         return slave->bond;
265 }
266 
267 static inline bool bond_should_override_tx_queue(struct bonding *bond)
268 {
269         return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
270                BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
271 }
272 
273 static inline bool bond_is_lb(const struct bonding *bond)
274 {
275         return BOND_MODE(bond) == BOND_MODE_TLB ||
276                BOND_MODE(bond) == BOND_MODE_ALB;
277 }
278 
279 static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
280 {
281         return (BOND_MODE(bond) == BOND_MODE_TLB)  &&
282                (bond->params.tlb_dynamic_lb == 0);
283 }
284 
285 static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)
286 {
287         return (BOND_MODE(bond) == BOND_MODE_8023AD ||
288                 BOND_MODE(bond) == BOND_MODE_XOR ||
289                 bond_is_nondyn_tlb(bond));
290 }
291 
292 static inline bool bond_mode_uses_arp(int mode)
293 {
294         return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
295                mode != BOND_MODE_ALB;
296 }
297 
298 static inline bool bond_mode_uses_primary(int mode)
299 {
300         return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
301                mode == BOND_MODE_ALB;
302 }
303 
304 static inline bool bond_uses_primary(struct bonding *bond)
305 {
306         return bond_mode_uses_primary(BOND_MODE(bond));
307 }
308 
309 static inline struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
310 {
311         struct slave *slave = rcu_dereference(bond->curr_active_slave);
312 
313         return bond_uses_primary(bond) && slave ? slave->dev : NULL;
314 }
315 
316 static inline bool bond_slave_is_up(struct slave *slave)
317 {
318         return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
319 }
320 
321 static inline void bond_set_active_slave(struct slave *slave)
322 {
323         if (slave->backup) {
324                 slave->backup = 0;
325                 bond_queue_slave_event(slave);
326                 bond_lower_state_changed(slave);
327                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
328         }
329 }
330 
331 static inline void bond_set_backup_slave(struct slave *slave)
332 {
333         if (!slave->backup) {
334                 slave->backup = 1;
335                 bond_queue_slave_event(slave);
336                 bond_lower_state_changed(slave);
337                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
338         }
339 }
340 
341 static inline void bond_set_slave_state(struct slave *slave,
342                                         int slave_state, bool notify)
343 {
344         if (slave->backup == slave_state)
345                 return;
346 
347         slave->backup = slave_state;
348         if (notify) {
349                 bond_lower_state_changed(slave);
350                 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
351                 bond_queue_slave_event(slave);
352                 slave->should_notify = 0;
353         } else {
354                 if (slave->should_notify)
355                         slave->should_notify = 0;
356                 else
357                         slave->should_notify = 1;
358         }
359 }
360 
361 static inline void bond_slave_state_change(struct bonding *bond)
362 {
363         struct list_head *iter;
364         struct slave *tmp;
365 
366         bond_for_each_slave(bond, tmp, iter) {
367                 if (tmp->link == BOND_LINK_UP)
368                         bond_set_active_slave(tmp);
369                 else if (tmp->link == BOND_LINK_DOWN)
370                         bond_set_backup_slave(tmp);
371         }
372 }
373 
374 static inline void bond_slave_state_notify(struct bonding *bond)
375 {
376         struct list_head *iter;
377         struct slave *tmp;
378 
379         bond_for_each_slave(bond, tmp, iter) {
380                 if (tmp->should_notify) {
381                         bond_lower_state_changed(tmp);
382                         rtmsg_ifinfo(RTM_NEWLINK, tmp->dev, 0, GFP_ATOMIC);
383                         tmp->should_notify = 0;
384                 }
385         }
386 }
387 
388 static inline int bond_slave_state(struct slave *slave)
389 {
390         return slave->backup;
391 }
392 
393 static inline bool bond_is_active_slave(struct slave *slave)
394 {
395         return !bond_slave_state(slave);
396 }
397 
398 static inline bool bond_slave_can_tx(struct slave *slave)
399 {
400         return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
401                bond_is_active_slave(slave);
402 }
403 
404 #define BOND_PRI_RESELECT_ALWAYS        0
405 #define BOND_PRI_RESELECT_BETTER        1
406 #define BOND_PRI_RESELECT_FAILURE       2
407 
408 #define BOND_FOM_NONE                   0
409 #define BOND_FOM_ACTIVE                 1
410 #define BOND_FOM_FOLLOW                 2
411 
412 #define BOND_ARP_TARGETS_ANY            0
413 #define BOND_ARP_TARGETS_ALL            1
414 
415 #define BOND_ARP_VALIDATE_NONE          0
416 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
417 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
418 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
419                                          BOND_ARP_VALIDATE_BACKUP)
420 #define BOND_ARP_FILTER                 (BOND_ARP_VALIDATE_ALL + 1)
421 #define BOND_ARP_FILTER_ACTIVE          (BOND_ARP_VALIDATE_ACTIVE | \
422                                          BOND_ARP_FILTER)
423 #define BOND_ARP_FILTER_BACKUP          (BOND_ARP_VALIDATE_BACKUP | \
424                                          BOND_ARP_FILTER)
425 
426 #define BOND_SLAVE_NOTIFY_NOW           true
427 #define BOND_SLAVE_NOTIFY_LATER         false
428 
429 static inline int slave_do_arp_validate(struct bonding *bond,
430                                         struct slave *slave)
431 {
432         return bond->params.arp_validate & (1 << bond_slave_state(slave));
433 }
434 
435 static inline int slave_do_arp_validate_only(struct bonding *bond)
436 {
437         return bond->params.arp_validate & BOND_ARP_FILTER;
438 }
439 
440 static inline int bond_is_ip_target_ok(__be32 addr)
441 {
442         return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
443 }
444 
445 /* Get the oldest arp which we've received on this slave for bond's
446  * arp_targets.
447  */
448 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
449                                                        struct slave *slave)
450 {
451         int i = 1;
452         unsigned long ret = slave->target_last_arp_rx[0];
453 
454         for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
455                 if (time_before(slave->target_last_arp_rx[i], ret))
456                         ret = slave->target_last_arp_rx[i];
457 
458         return ret;
459 }
460 
461 static inline unsigned long slave_last_rx(struct bonding *bond,
462                                         struct slave *slave)
463 {
464         if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
465                 return slave_oldest_target_arp_rx(bond, slave);
466 
467         return slave->last_rx;
468 }
469 
470 #ifdef CONFIG_NET_POLL_CONTROLLER
471 static inline void bond_netpoll_send_skb(const struct slave *slave,
472                                          struct sk_buff *skb)
473 {
474         struct netpoll *np = slave->np;
475 
476         if (np)
477                 netpoll_send_skb(np, skb);
478 }
479 #else
480 static inline void bond_netpoll_send_skb(const struct slave *slave,
481                                          struct sk_buff *skb)
482 {
483 }
484 #endif
485 
486 static inline void bond_set_slave_inactive_flags(struct slave *slave,
487                                                  bool notify)
488 {
489         if (!bond_is_lb(slave->bond))
490                 bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
491         if (!slave->bond->params.all_slaves_active)
492                 slave->inactive = 1;
493 }
494 
495 static inline void bond_set_slave_active_flags(struct slave *slave,
496                                                bool notify)
497 {
498         bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
499         slave->inactive = 0;
500 }
501 
502 static inline bool bond_is_slave_inactive(struct slave *slave)
503 {
504         return slave->inactive;
505 }
506 
507 static inline void bond_set_slave_link_state(struct slave *slave, int state,
508                                              bool notify)
509 {
510         if (slave->link == state)
511                 return;
512 
513         slave->link = state;
514         if (notify) {
515                 bond_queue_slave_event(slave);
516                 bond_lower_state_changed(slave);
517                 slave->should_notify_link = 0;
518         } else {
519                 if (slave->should_notify_link)
520                         slave->should_notify_link = 0;
521                 else
522                         slave->should_notify_link = 1;
523         }
524 }
525 
526 static inline void bond_slave_link_notify(struct bonding *bond)
527 {
528         struct list_head *iter;
529         struct slave *tmp;
530 
531         bond_for_each_slave(bond, tmp, iter) {
532                 if (tmp->should_notify_link) {
533                         bond_queue_slave_event(tmp);
534                         bond_lower_state_changed(tmp);
535                         tmp->should_notify_link = 0;
536                 }
537         }
538 }
539 
540 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
541 {
542         struct in_device *in_dev;
543         __be32 addr = 0;
544 
545         rcu_read_lock();
546         in_dev = __in_dev_get_rcu(dev);
547 
548         if (in_dev)
549                 addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
550                                          RT_SCOPE_HOST);
551         rcu_read_unlock();
552         return addr;
553 }
554 
555 struct bond_net {
556         struct net              *net;   /* Associated network namespace */
557         struct list_head        dev_list;
558 #ifdef CONFIG_PROC_FS
559         struct proc_dir_entry   *proc_dir;
560 #endif
561         struct class_attribute  class_attr_bonding_masters;
562 };
563 
564 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
565 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
566 int bond_create(struct net *net, const char *name);
567 int bond_create_sysfs(struct bond_net *net);
568 void bond_destroy_sysfs(struct bond_net *net);
569 void bond_prepare_sysfs_group(struct bonding *bond);
570 int bond_sysfs_slave_add(struct slave *slave);
571 void bond_sysfs_slave_del(struct slave *slave);
572 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
573 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
574 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
575 int bond_set_carrier(struct bonding *bond);
576 void bond_select_active_slave(struct bonding *bond);
577 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
578 void bond_create_debugfs(void);
579 void bond_destroy_debugfs(void);
580 void bond_debug_register(struct bonding *bond);
581 void bond_debug_unregister(struct bonding *bond);
582 void bond_debug_reregister(struct bonding *bond);
583 const char *bond_mode_name(int mode);
584 void bond_setup(struct net_device *bond_dev);
585 unsigned int bond_get_num_tx_queues(void);
586 int bond_netlink_init(void);
587 void bond_netlink_fini(void);
588 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
589 const char *bond_slave_link_status(s8 link);
590 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
591                                               struct net_device *end_dev,
592                                               int level);
593 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
594 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
595 
596 #ifdef CONFIG_PROC_FS
597 void bond_create_proc_entry(struct bonding *bond);
598 void bond_remove_proc_entry(struct bonding *bond);
599 void bond_create_proc_dir(struct bond_net *bn);
600 void bond_destroy_proc_dir(struct bond_net *bn);
601 #else
602 static inline void bond_create_proc_entry(struct bonding *bond)
603 {
604 }
605 
606 static inline void bond_remove_proc_entry(struct bonding *bond)
607 {
608 }
609 
610 static inline void bond_create_proc_dir(struct bond_net *bn)
611 {
612 }
613 
614 static inline void bond_destroy_proc_dir(struct bond_net *bn)
615 {
616 }
617 #endif
618 
619 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
620                                                const u8 *mac)
621 {
622         struct list_head *iter;
623         struct slave *tmp;
624 
625         bond_for_each_slave(bond, tmp, iter)
626                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
627                         return tmp;
628 
629         return NULL;
630 }
631 
632 /* Caller must hold rcu_read_lock() for read */
633 static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
634                                                const u8 *mac)
635 {
636         struct list_head *iter;
637         struct slave *tmp;
638 
639         bond_for_each_slave_rcu(bond, tmp, iter)
640                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
641                         return tmp;
642 
643         return NULL;
644 }
645 
646 /* Caller must hold rcu_read_lock() for read */
647 static inline bool bond_slave_has_mac_rx(struct bonding *bond, const u8 *mac)
648 {
649         struct list_head *iter;
650         struct slave *tmp;
651         struct netdev_hw_addr *ha;
652 
653         bond_for_each_slave_rcu(bond, tmp, iter)
654                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
655                         return true;
656 
657         if (netdev_uc_empty(bond->dev))
658                 return false;
659 
660         netdev_for_each_uc_addr(ha, bond->dev)
661                 if (ether_addr_equal_64bits(mac, ha->addr))
662                         return true;
663 
664         return false;
665 }
666 
667 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
668  * Returns -1 if not found, index if found
669  */
670 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
671 {
672         int i;
673 
674         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
675                 if (targets[i] == ip)
676                         return i;
677                 else if (targets[i] == 0)
678                         break;
679 
680         return -1;
681 }
682 
683 /* exported from bond_main.c */
684 extern unsigned int bond_net_id;
685 extern const struct bond_parm_tbl bond_lacp_tbl[];
686 extern const struct bond_parm_tbl xmit_hashtype_tbl[];
687 extern const struct bond_parm_tbl arp_validate_tbl[];
688 extern const struct bond_parm_tbl arp_all_targets_tbl[];
689 extern const struct bond_parm_tbl fail_over_mac_tbl[];
690 extern const struct bond_parm_tbl pri_reselect_tbl[];
691 extern struct bond_parm_tbl ad_select_tbl[];
692 
693 /* exported from bond_netlink.c */
694 extern struct rtnl_link_ops bond_link_ops;
695 
696 static inline void bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
697 {
698         atomic_long_inc(&dev->tx_dropped);
699         dev_kfree_skb_any(skb);
700 }
701 
702 #endif /* _NET_BONDING_H */
703 

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