1 /* SPDX-License-Identifier: GPL-1.0+ */
2 /*
3  * Bond several ethernet interfaces into a Cisco, running 'Etherchannel'.
4  *
5  * Portions are (c) Copyright 1995 Simon "Guru Aleph-Null" Janes
6  * NCM: Network and Communications Management, Inc.
7  *
8  * BUT, I'm the one who modified it for ethernet, so:
9  * (c) Copyright 1999, Thomas Davis, tadavis@lbl.gov
10  *
11  */
12 
13 #ifndef _NET_BONDING_H
14 #define _NET_BONDING_H
15 
16 #include <linux/timer.h>
17 #include <linux/proc_fs.h>
18 #include <linux/if_bonding.h>
19 #include <linux/cpumask.h>
20 #include <linux/in6.h>
21 #include <linux/netpoll.h>
22 #include <linux/inetdevice.h>
23 #include <linux/etherdevice.h>
24 #include <linux/reciprocal_div.h>
25 #include <linux/if_link.h>
26 
27 #include <net/bond_3ad.h>
28 #include <net/bond_alb.h>
29 #include <net/bond_options.h>
30 #include <net/ipv6.h>
31 #include <net/addrconf.h>
32 
33 #define BOND_MAX_ARP_TARGETS	16
34 #define BOND_MAX_NS_TARGETS	BOND_MAX_ARP_TARGETS
35 
36 #define BOND_DEFAULT_MIIMON	100
37 
38 #ifndef __long_aligned
39 #define __long_aligned __attribute__((aligned((sizeof(long)))))
40 #endif
41 
42 #define slave_info(bond_dev, slave_dev, fmt, ...) \
43 	netdev_info(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ##__VA_ARGS__)
44 #define slave_warn(bond_dev, slave_dev, fmt, ...) \
45 	netdev_warn(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ##__VA_ARGS__)
46 #define slave_dbg(bond_dev, slave_dev, fmt, ...) \
47 	netdev_dbg(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ##__VA_ARGS__)
48 #define slave_err(bond_dev, slave_dev, fmt, ...) \
49 	netdev_err(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ##__VA_ARGS__)
50 
51 #define BOND_MODE(bond) ((bond)->params.mode)
52 
53 /* slave list primitives */
54 #define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
55 
56 #define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
57 
58 /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
59 #define bond_first_slave(bond) \
60 	(bond_has_slaves(bond) ? \
61 		netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
62 		NULL)
63 #define bond_last_slave(bond) \
64 	(bond_has_slaves(bond) ? \
65 		netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
66 		NULL)
67 
68 /* Caller must have rcu_read_lock */
69 #define bond_first_slave_rcu(bond) \
70 	netdev_lower_get_first_private_rcu(bond->dev)
71 
72 #define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
73 #define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
74 
75 /**
76  * bond_for_each_slave - iterate over all slaves
77  * @bond:	the bond holding this list
78  * @pos:	current slave
79  * @iter:	list_head * iterator
80  *
81  * Caller must hold RTNL
82  */
83 #define bond_for_each_slave(bond, pos, iter) \
84 	netdev_for_each_lower_private((bond)->dev, pos, iter)
85 
86 /* Caller must have rcu_read_lock */
87 #define bond_for_each_slave_rcu(bond, pos, iter) \
88 	netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
89 
90 #define BOND_XFRM_FEATURES (NETIF_F_HW_ESP | NETIF_F_HW_ESP_TX_CSUM | \
91 			    NETIF_F_GSO_ESP)
92 
93 #ifdef CONFIG_NET_POLL_CONTROLLER
94 extern atomic_t netpoll_block_tx;
95 
block_netpoll_tx(void)96 static inline void block_netpoll_tx(void)
97 {
98 	atomic_inc(&netpoll_block_tx);
99 }
100 
unblock_netpoll_tx(void)101 static inline void unblock_netpoll_tx(void)
102 {
103 	atomic_dec(&netpoll_block_tx);
104 }
105 
is_netpoll_tx_blocked(struct net_device * dev)106 static inline int is_netpoll_tx_blocked(struct net_device *dev)
107 {
108 	if (unlikely(netpoll_tx_running(dev)))
109 		return atomic_read(&netpoll_block_tx);
110 	return 0;
111 }
112 #else
113 #define block_netpoll_tx()
114 #define unblock_netpoll_tx()
115 #define is_netpoll_tx_blocked(dev) (0)
116 #endif
117 
118 struct bond_params {
119 	int mode;
120 	int xmit_policy;
121 	int miimon;
122 	u8 num_peer_notif;
123 	u8 missed_max;
124 	int arp_interval;
125 	int arp_validate;
126 	int arp_all_targets;
127 	int use_carrier;
128 	int fail_over_mac;
129 	int updelay;
130 	int downdelay;
131 	int peer_notif_delay;
132 	int lacp_active;
133 	int lacp_fast;
134 	unsigned int min_links;
135 	int ad_select;
136 	char primary[IFNAMSIZ];
137 	int primary_reselect;
138 	__be32 arp_targets[BOND_MAX_ARP_TARGETS];
139 	int tx_queues;
140 	int all_slaves_active;
141 	int resend_igmp;
142 	int lp_interval;
143 	int packets_per_slave;
144 	int tlb_dynamic_lb;
145 	struct reciprocal_value reciprocal_packets_per_slave;
146 	u16 ad_actor_sys_prio;
147 	u16 ad_user_port_key;
148 #if IS_ENABLED(CONFIG_IPV6)
149 	struct in6_addr ns_targets[BOND_MAX_NS_TARGETS];
150 #endif
151 
152 	/* 2 bytes of padding : see ether_addr_equal_64bits() */
153 	u8 ad_actor_system[ETH_ALEN + 2];
154 };
155 
156 struct slave {
157 	struct net_device *dev; /* first - useful for panic debug */
158 	struct bonding *bond; /* our master */
159 	int    delay;
160 	/* all 4 in jiffies */
161 	unsigned long last_link_up;
162 	unsigned long last_tx;
163 	unsigned long last_rx;
164 	unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
165 	s8     link;		/* one of BOND_LINK_XXXX */
166 	s8     link_new_state;	/* one of BOND_LINK_XXXX */
167 	u8     backup:1,   /* indicates backup slave. Value corresponds with
168 			      BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
169 	       inactive:1, /* indicates inactive slave */
170 	       should_notify:1, /* indicates whether the state changed */
171 	       should_notify_link:1; /* indicates whether the link changed */
172 	u8     duplex;
173 	u32    original_mtu;
174 	u32    link_failure_count;
175 	u32    speed;
176 	u16    queue_id;
177 	u8     perm_hwaddr[MAX_ADDR_LEN];
178 	int    prio;
179 	struct ad_slave_info *ad_info;
180 	struct tlb_slave_info tlb_info;
181 #ifdef CONFIG_NET_POLL_CONTROLLER
182 	struct netpoll *np;
183 #endif
184 	struct delayed_work notify_work;
185 	struct kobject kobj;
186 	struct rtnl_link_stats64 slave_stats;
187 };
188 
to_slave(struct kobject * kobj)189 static inline struct slave *to_slave(struct kobject *kobj)
190 {
191 	return container_of(kobj, struct slave, kobj);
192 }
193 
194 struct bond_up_slave {
195 	unsigned int	count;
196 	struct rcu_head rcu;
197 	struct slave	*arr[];
198 };
199 
200 /*
201  * Link pseudo-state only used internally by monitors
202  */
203 #define BOND_LINK_NOCHANGE -1
204 
205 struct bond_ipsec {
206 	struct list_head list;
207 	struct xfrm_state *xs;
208 };
209 
210 /*
211  * Here are the locking policies for the two bonding locks:
212  * Get rcu_read_lock when reading or RTNL when writing slave list.
213  */
214 struct bonding {
215 	struct   net_device *dev; /* first - useful for panic debug */
216 	struct   slave __rcu *curr_active_slave;
217 	struct   slave __rcu *current_arp_slave;
218 	struct   slave __rcu *primary_slave;
219 	struct   bond_up_slave __rcu *usable_slaves;
220 	struct   bond_up_slave __rcu *all_slaves;
221 	bool     force_primary;
222 	bool     notifier_ctx;
223 	s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
224 	int     (*recv_probe)(const struct sk_buff *, struct bonding *,
225 			      struct slave *);
226 	/* mode_lock is used for mode-specific locking needs, currently used by:
227 	 * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
228 	 *                bond_3ad_state_machine_handler() concurrently and also
229 	 *                the access to the state machine shared variables.
230 	 * TLB mode (5) - to sync the use and modifications of its hash table
231 	 * ALB mode (6) - to sync the use and modifications of its hash table
232 	 */
233 	spinlock_t mode_lock;
234 	spinlock_t stats_lock;
235 	u32	 send_peer_notif;
236 	u8       igmp_retrans;
237 #ifdef CONFIG_PROC_FS
238 	struct   proc_dir_entry *proc_entry;
239 	char     proc_file_name[IFNAMSIZ];
240 #endif /* CONFIG_PROC_FS */
241 	struct   list_head bond_list;
242 	u32 __percpu *rr_tx_counter;
243 	struct   ad_bond_info ad_info;
244 	struct   alb_bond_info alb_info;
245 	struct   bond_params params;
246 	struct   workqueue_struct *wq;
247 	struct   delayed_work mii_work;
248 	struct   delayed_work arp_work;
249 	struct   delayed_work alb_work;
250 	struct   delayed_work ad_work;
251 	struct   delayed_work mcast_work;
252 	struct   delayed_work slave_arr_work;
253 #ifdef CONFIG_DEBUG_FS
254 	/* debugging support via debugfs */
255 	struct	 dentry *debug_dir;
256 #endif /* CONFIG_DEBUG_FS */
257 	struct rtnl_link_stats64 bond_stats;
258 #ifdef CONFIG_XFRM_OFFLOAD
259 	struct list_head ipsec_list;
260 	/* protecting ipsec_list */
261 	spinlock_t ipsec_lock;
262 #endif /* CONFIG_XFRM_OFFLOAD */
263 	struct bpf_prog *xdp_prog;
264 };
265 
266 #define bond_slave_get_rcu(dev) \
267 	((struct slave *) rcu_dereference(dev->rx_handler_data))
268 
269 #define bond_slave_get_rtnl(dev) \
270 	((struct slave *) rtnl_dereference(dev->rx_handler_data))
271 
272 void bond_queue_slave_event(struct slave *slave);
273 void bond_lower_state_changed(struct slave *slave);
274 
275 struct bond_vlan_tag {
276 	__be16		vlan_proto;
277 	unsigned short	vlan_id;
278 };
279 
280 /*
281  * Returns NULL if the net_device does not belong to any of the bond's slaves
282  *
283  * Caller must hold bond lock for read
284  */
bond_get_slave_by_dev(struct bonding * bond,struct net_device * slave_dev)285 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
286 						  struct net_device *slave_dev)
287 {
288 	return netdev_lower_dev_get_private(bond->dev, slave_dev);
289 }
290 
bond_get_bond_by_slave(struct slave * slave)291 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
292 {
293 	return slave->bond;
294 }
295 
bond_should_override_tx_queue(struct bonding * bond)296 static inline bool bond_should_override_tx_queue(struct bonding *bond)
297 {
298 	return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
299 	       BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
300 }
301 
bond_is_lb(const struct bonding * bond)302 static inline bool bond_is_lb(const struct bonding *bond)
303 {
304 	return BOND_MODE(bond) == BOND_MODE_TLB ||
305 	       BOND_MODE(bond) == BOND_MODE_ALB;
306 }
307 
bond_needs_speed_duplex(const struct bonding * bond)308 static inline bool bond_needs_speed_duplex(const struct bonding *bond)
309 {
310 	return BOND_MODE(bond) == BOND_MODE_8023AD || bond_is_lb(bond);
311 }
312 
bond_is_nondyn_tlb(const struct bonding * bond)313 static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
314 {
315 	return (bond_is_lb(bond) && bond->params.tlb_dynamic_lb == 0);
316 }
317 
bond_mode_can_use_xmit_hash(const struct bonding * bond)318 static inline bool bond_mode_can_use_xmit_hash(const struct bonding *bond)
319 {
320 	return (BOND_MODE(bond) == BOND_MODE_8023AD ||
321 		BOND_MODE(bond) == BOND_MODE_XOR ||
322 		BOND_MODE(bond) == BOND_MODE_TLB ||
323 		BOND_MODE(bond) == BOND_MODE_ALB);
324 }
325 
bond_mode_uses_xmit_hash(const struct bonding * bond)326 static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)
327 {
328 	return (BOND_MODE(bond) == BOND_MODE_8023AD ||
329 		BOND_MODE(bond) == BOND_MODE_XOR ||
330 		bond_is_nondyn_tlb(bond));
331 }
332 
bond_mode_uses_arp(int mode)333 static inline bool bond_mode_uses_arp(int mode)
334 {
335 	return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
336 	       mode != BOND_MODE_ALB;
337 }
338 
bond_mode_uses_primary(int mode)339 static inline bool bond_mode_uses_primary(int mode)
340 {
341 	return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
342 	       mode == BOND_MODE_ALB;
343 }
344 
bond_uses_primary(struct bonding * bond)345 static inline bool bond_uses_primary(struct bonding *bond)
346 {
347 	return bond_mode_uses_primary(BOND_MODE(bond));
348 }
349 
bond_option_active_slave_get_rcu(struct bonding * bond)350 static inline struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
351 {
352 	struct slave *slave = rcu_dereference_rtnl(bond->curr_active_slave);
353 
354 	return bond_uses_primary(bond) && slave ? slave->dev : NULL;
355 }
356 
bond_slave_is_up(struct slave * slave)357 static inline bool bond_slave_is_up(struct slave *slave)
358 {
359 	return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
360 }
361 
bond_set_active_slave(struct slave * slave)362 static inline void bond_set_active_slave(struct slave *slave)
363 {
364 	if (slave->backup) {
365 		slave->backup = 0;
366 		bond_queue_slave_event(slave);
367 		bond_lower_state_changed(slave);
368 	}
369 }
370 
bond_set_backup_slave(struct slave * slave)371 static inline void bond_set_backup_slave(struct slave *slave)
372 {
373 	if (!slave->backup) {
374 		slave->backup = 1;
375 		bond_queue_slave_event(slave);
376 		bond_lower_state_changed(slave);
377 	}
378 }
379 
bond_set_slave_state(struct slave * slave,int slave_state,bool notify)380 static inline void bond_set_slave_state(struct slave *slave,
381 					int slave_state, bool notify)
382 {
383 	if (slave->backup == slave_state)
384 		return;
385 
386 	slave->backup = slave_state;
387 	if (notify) {
388 		bond_lower_state_changed(slave);
389 		bond_queue_slave_event(slave);
390 		slave->should_notify = 0;
391 	} else {
392 		if (slave->should_notify)
393 			slave->should_notify = 0;
394 		else
395 			slave->should_notify = 1;
396 	}
397 }
398 
bond_slave_state_change(struct bonding * bond)399 static inline void bond_slave_state_change(struct bonding *bond)
400 {
401 	struct list_head *iter;
402 	struct slave *tmp;
403 
404 	bond_for_each_slave(bond, tmp, iter) {
405 		if (tmp->link == BOND_LINK_UP)
406 			bond_set_active_slave(tmp);
407 		else if (tmp->link == BOND_LINK_DOWN)
408 			bond_set_backup_slave(tmp);
409 	}
410 }
411 
bond_slave_state_notify(struct bonding * bond)412 static inline void bond_slave_state_notify(struct bonding *bond)
413 {
414 	struct list_head *iter;
415 	struct slave *tmp;
416 
417 	bond_for_each_slave(bond, tmp, iter) {
418 		if (tmp->should_notify) {
419 			bond_lower_state_changed(tmp);
420 			tmp->should_notify = 0;
421 		}
422 	}
423 }
424 
bond_slave_state(struct slave * slave)425 static inline int bond_slave_state(struct slave *slave)
426 {
427 	return slave->backup;
428 }
429 
bond_is_active_slave(struct slave * slave)430 static inline bool bond_is_active_slave(struct slave *slave)
431 {
432 	return !bond_slave_state(slave);
433 }
434 
bond_slave_can_tx(struct slave * slave)435 static inline bool bond_slave_can_tx(struct slave *slave)
436 {
437 	return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
438 	       bond_is_active_slave(slave);
439 }
440 
bond_is_active_slave_dev(const struct net_device * slave_dev)441 static inline bool bond_is_active_slave_dev(const struct net_device *slave_dev)
442 {
443 	struct slave *slave;
444 	bool active;
445 
446 	rcu_read_lock();
447 	slave = bond_slave_get_rcu(slave_dev);
448 	active = bond_is_active_slave(slave);
449 	rcu_read_unlock();
450 
451 	return active;
452 }
453 
bond_hw_addr_copy(u8 * dst,const u8 * src,unsigned int len)454 static inline void bond_hw_addr_copy(u8 *dst, const u8 *src, unsigned int len)
455 {
456 	if (len == ETH_ALEN) {
457 		ether_addr_copy(dst, src);
458 		return;
459 	}
460 
461 	memcpy(dst, src, len);
462 }
463 
464 #define BOND_PRI_RESELECT_ALWAYS	0
465 #define BOND_PRI_RESELECT_BETTER	1
466 #define BOND_PRI_RESELECT_FAILURE	2
467 
468 #define BOND_FOM_NONE			0
469 #define BOND_FOM_ACTIVE			1
470 #define BOND_FOM_FOLLOW			2
471 
472 #define BOND_ARP_TARGETS_ANY		0
473 #define BOND_ARP_TARGETS_ALL		1
474 
475 #define BOND_ARP_VALIDATE_NONE		0
476 #define BOND_ARP_VALIDATE_ACTIVE	(1 << BOND_STATE_ACTIVE)
477 #define BOND_ARP_VALIDATE_BACKUP	(1 << BOND_STATE_BACKUP)
478 #define BOND_ARP_VALIDATE_ALL		(BOND_ARP_VALIDATE_ACTIVE | \
479 					 BOND_ARP_VALIDATE_BACKUP)
480 #define BOND_ARP_FILTER			(BOND_ARP_VALIDATE_ALL + 1)
481 #define BOND_ARP_FILTER_ACTIVE		(BOND_ARP_VALIDATE_ACTIVE | \
482 					 BOND_ARP_FILTER)
483 #define BOND_ARP_FILTER_BACKUP		(BOND_ARP_VALIDATE_BACKUP | \
484 					 BOND_ARP_FILTER)
485 
486 #define BOND_SLAVE_NOTIFY_NOW		true
487 #define BOND_SLAVE_NOTIFY_LATER		false
488 
slave_do_arp_validate(struct bonding * bond,struct slave * slave)489 static inline int slave_do_arp_validate(struct bonding *bond,
490 					struct slave *slave)
491 {
492 	return bond->params.arp_validate & (1 << bond_slave_state(slave));
493 }
494 
slave_do_arp_validate_only(struct bonding * bond)495 static inline int slave_do_arp_validate_only(struct bonding *bond)
496 {
497 	return bond->params.arp_validate & BOND_ARP_FILTER;
498 }
499 
bond_is_ip_target_ok(__be32 addr)500 static inline int bond_is_ip_target_ok(__be32 addr)
501 {
502 	return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
503 }
504 
505 #if IS_ENABLED(CONFIG_IPV6)
bond_is_ip6_target_ok(struct in6_addr * addr)506 static inline int bond_is_ip6_target_ok(struct in6_addr *addr)
507 {
508 	return !ipv6_addr_any(addr) &&
509 	       !ipv6_addr_loopback(addr) &&
510 	       !ipv6_addr_is_multicast(addr);
511 }
512 #endif
513 
514 /* Get the oldest arp which we've received on this slave for bond's
515  * arp_targets.
516  */
slave_oldest_target_arp_rx(struct bonding * bond,struct slave * slave)517 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
518 						       struct slave *slave)
519 {
520 	int i = 1;
521 	unsigned long ret = slave->target_last_arp_rx[0];
522 
523 	for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
524 		if (time_before(slave->target_last_arp_rx[i], ret))
525 			ret = slave->target_last_arp_rx[i];
526 
527 	return ret;
528 }
529 
slave_last_rx(struct bonding * bond,struct slave * slave)530 static inline unsigned long slave_last_rx(struct bonding *bond,
531 					struct slave *slave)
532 {
533 	if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
534 		return slave_oldest_target_arp_rx(bond, slave);
535 
536 	return slave->last_rx;
537 }
538 
slave_update_last_tx(struct slave * slave)539 static inline void slave_update_last_tx(struct slave *slave)
540 {
541 	WRITE_ONCE(slave->last_tx, jiffies);
542 }
543 
slave_last_tx(struct slave * slave)544 static inline unsigned long slave_last_tx(struct slave *slave)
545 {
546 	return READ_ONCE(slave->last_tx);
547 }
548 
549 #ifdef CONFIG_NET_POLL_CONTROLLER
bond_netpoll_send_skb(const struct slave * slave,struct sk_buff * skb)550 static inline netdev_tx_t bond_netpoll_send_skb(const struct slave *slave,
551 					 struct sk_buff *skb)
552 {
553 	return netpoll_send_skb(slave->np, skb);
554 }
555 #else
bond_netpoll_send_skb(const struct slave * slave,struct sk_buff * skb)556 static inline netdev_tx_t bond_netpoll_send_skb(const struct slave *slave,
557 					 struct sk_buff *skb)
558 {
559 	BUG();
560 	return NETDEV_TX_OK;
561 }
562 #endif
563 
bond_set_slave_inactive_flags(struct slave * slave,bool notify)564 static inline void bond_set_slave_inactive_flags(struct slave *slave,
565 						 bool notify)
566 {
567 	if (!bond_is_lb(slave->bond))
568 		bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
569 	if (!slave->bond->params.all_slaves_active)
570 		slave->inactive = 1;
571 }
572 
bond_set_slave_active_flags(struct slave * slave,bool notify)573 static inline void bond_set_slave_active_flags(struct slave *slave,
574 					       bool notify)
575 {
576 	bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
577 	slave->inactive = 0;
578 }
579 
bond_is_slave_inactive(struct slave * slave)580 static inline bool bond_is_slave_inactive(struct slave *slave)
581 {
582 	return slave->inactive;
583 }
584 
bond_propose_link_state(struct slave * slave,int state)585 static inline void bond_propose_link_state(struct slave *slave, int state)
586 {
587 	slave->link_new_state = state;
588 }
589 
bond_commit_link_state(struct slave * slave,bool notify)590 static inline void bond_commit_link_state(struct slave *slave, bool notify)
591 {
592 	if (slave->link_new_state == BOND_LINK_NOCHANGE)
593 		return;
594 
595 	slave->link = slave->link_new_state;
596 	if (notify) {
597 		bond_queue_slave_event(slave);
598 		bond_lower_state_changed(slave);
599 		slave->should_notify_link = 0;
600 	} else {
601 		if (slave->should_notify_link)
602 			slave->should_notify_link = 0;
603 		else
604 			slave->should_notify_link = 1;
605 	}
606 }
607 
bond_set_slave_link_state(struct slave * slave,int state,bool notify)608 static inline void bond_set_slave_link_state(struct slave *slave, int state,
609 					     bool notify)
610 {
611 	bond_propose_link_state(slave, state);
612 	bond_commit_link_state(slave, notify);
613 }
614 
bond_slave_link_notify(struct bonding * bond)615 static inline void bond_slave_link_notify(struct bonding *bond)
616 {
617 	struct list_head *iter;
618 	struct slave *tmp;
619 
620 	bond_for_each_slave(bond, tmp, iter) {
621 		if (tmp->should_notify_link) {
622 			bond_queue_slave_event(tmp);
623 			bond_lower_state_changed(tmp);
624 			tmp->should_notify_link = 0;
625 		}
626 	}
627 }
628 
bond_confirm_addr(struct net_device * dev,__be32 dst,__be32 local)629 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
630 {
631 	struct in_device *in_dev;
632 	__be32 addr = 0;
633 
634 	rcu_read_lock();
635 	in_dev = __in_dev_get_rcu(dev);
636 
637 	if (in_dev)
638 		addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
639 					 RT_SCOPE_HOST);
640 	rcu_read_unlock();
641 	return addr;
642 }
643 
644 struct bond_net {
645 	struct net		*net;	/* Associated network namespace */
646 	struct list_head	dev_list;
647 #ifdef CONFIG_PROC_FS
648 	struct proc_dir_entry	*proc_dir;
649 #endif
650 	struct class_attribute	class_attr_bonding_masters;
651 };
652 
653 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
654 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
655 int bond_create(struct net *net, const char *name);
656 int bond_create_sysfs(struct bond_net *net);
657 void bond_destroy_sysfs(struct bond_net *net);
658 void bond_prepare_sysfs_group(struct bonding *bond);
659 int bond_sysfs_slave_add(struct slave *slave);
660 void bond_sysfs_slave_del(struct slave *slave);
661 void bond_xdp_set_features(struct net_device *bond_dev);
662 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
663 		 struct netlink_ext_ack *extack);
664 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
665 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
666 int bond_set_carrier(struct bonding *bond);
667 void bond_select_active_slave(struct bonding *bond);
668 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
669 void bond_create_debugfs(void);
670 void bond_destroy_debugfs(void);
671 void bond_debug_register(struct bonding *bond);
672 void bond_debug_unregister(struct bonding *bond);
673 void bond_debug_reregister(struct bonding *bond);
674 const char *bond_mode_name(int mode);
675 void bond_setup(struct net_device *bond_dev);
676 unsigned int bond_get_num_tx_queues(void);
677 int bond_netlink_init(void);
678 void bond_netlink_fini(void);
679 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
680 const char *bond_slave_link_status(s8 link);
681 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
682 					      struct net_device *end_dev,
683 					      int level);
684 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
685 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
686 void bond_work_init_all(struct bonding *bond);
687 
688 #ifdef CONFIG_PROC_FS
689 void bond_create_proc_entry(struct bonding *bond);
690 void bond_remove_proc_entry(struct bonding *bond);
691 void bond_create_proc_dir(struct bond_net *bn);
692 void bond_destroy_proc_dir(struct bond_net *bn);
693 #else
bond_create_proc_entry(struct bonding * bond)694 static inline void bond_create_proc_entry(struct bonding *bond)
695 {
696 }
697 
bond_remove_proc_entry(struct bonding * bond)698 static inline void bond_remove_proc_entry(struct bonding *bond)
699 {
700 }
701 
bond_create_proc_dir(struct bond_net * bn)702 static inline void bond_create_proc_dir(struct bond_net *bn)
703 {
704 }
705 
bond_destroy_proc_dir(struct bond_net * bn)706 static inline void bond_destroy_proc_dir(struct bond_net *bn)
707 {
708 }
709 #endif
710 
bond_slave_has_mac(struct bonding * bond,const u8 * mac)711 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
712 					       const u8 *mac)
713 {
714 	struct list_head *iter;
715 	struct slave *tmp;
716 
717 	bond_for_each_slave(bond, tmp, iter)
718 		if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
719 			return tmp;
720 
721 	return NULL;
722 }
723 
724 /* Caller must hold rcu_read_lock() for read */
bond_slave_has_mac_rcu(struct bonding * bond,const u8 * mac)725 static inline bool bond_slave_has_mac_rcu(struct bonding *bond, const u8 *mac)
726 {
727 	struct list_head *iter;
728 	struct slave *tmp;
729 
730 	bond_for_each_slave_rcu(bond, tmp, iter)
731 		if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
732 			return true;
733 	return false;
734 }
735 
736 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
737  * Returns -1 if not found, index if found
738  */
bond_get_targets_ip(__be32 * targets,__be32 ip)739 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
740 {
741 	int i;
742 
743 	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
744 		if (targets[i] == ip)
745 			return i;
746 		else if (targets[i] == 0)
747 			break;
748 
749 	return -1;
750 }
751 
752 #if IS_ENABLED(CONFIG_IPV6)
bond_get_targets_ip6(struct in6_addr * targets,struct in6_addr * ip)753 static inline int bond_get_targets_ip6(struct in6_addr *targets, struct in6_addr *ip)
754 {
755 	struct in6_addr mcaddr;
756 	int i;
757 
758 	for (i = 0; i < BOND_MAX_NS_TARGETS; i++) {
759 		addrconf_addr_solict_mult(&targets[i], &mcaddr);
760 		if ((ipv6_addr_equal(&targets[i], ip)) ||
761 		    (ipv6_addr_equal(&mcaddr, ip)))
762 			return i;
763 		else if (ipv6_addr_any(&targets[i]))
764 			break;
765 	}
766 
767 	return -1;
768 }
769 #endif
770 
771 /* exported from bond_main.c */
772 extern unsigned int bond_net_id;
773 
774 /* exported from bond_netlink.c */
775 extern struct rtnl_link_ops bond_link_ops;
776 
777 /* exported from bond_sysfs_slave.c */
778 extern const struct sysfs_ops slave_sysfs_ops;
779 
780 /* exported from bond_3ad.c */
781 extern const u8 lacpdu_mcast_addr[];
782 
bond_tx_drop(struct net_device * dev,struct sk_buff * skb)783 static inline netdev_tx_t bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
784 {
785 	dev_core_stats_tx_dropped_inc(dev);
786 	dev_kfree_skb_any(skb);
787 	return NET_XMIT_DROP;
788 }
789 
790 #endif /* _NET_BONDING_H */
791