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 #include <net/ipv6.h>
33 #include <net/addrconf.h>
34 
35 #define BOND_MAX_ARP_TARGETS	16
36 #define BOND_MAX_NS_TARGETS	BOND_MAX_ARP_TARGETS
37 
38 #define BOND_DEFAULT_MIIMON	100
39 
40 #ifndef __long_aligned
41 #define __long_aligned __attribute__((aligned((sizeof(long)))))
42 #endif
43 
44 #define slave_info(bond_dev, slave_dev, fmt, ...) \
45 	netdev_info(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ##__VA_ARGS__)
46 #define slave_warn(bond_dev, slave_dev, fmt, ...) \
47 	netdev_warn(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ##__VA_ARGS__)
48 #define slave_dbg(bond_dev, slave_dev, fmt, ...) \
49 	netdev_dbg(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ##__VA_ARGS__)
50 #define slave_err(bond_dev, slave_dev, fmt, ...) \
51 	netdev_err(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ##__VA_ARGS__)
52 
53 #define BOND_MODE(bond) ((bond)->params.mode)
54 
55 /* slave list primitives */
56 #define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
57 
58 #define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
59 
60 /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
61 #define bond_first_slave(bond) \
62 	(bond_has_slaves(bond) ? \
63 		netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
64 		NULL)
65 #define bond_last_slave(bond) \
66 	(bond_has_slaves(bond) ? \
67 		netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
68 		NULL)
69 
70 /* Caller must have rcu_read_lock */
71 #define bond_first_slave_rcu(bond) \
72 	netdev_lower_get_first_private_rcu(bond->dev)
73 
74 #define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
75 #define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
76 
77 /**
78  * bond_for_each_slave - iterate over all slaves
79  * @bond:	the bond holding this list
80  * @pos:	current slave
81  * @iter:	list_head * iterator
82  *
83  * Caller must hold RTNL
84  */
85 #define bond_for_each_slave(bond, pos, iter) \
86 	netdev_for_each_lower_private((bond)->dev, pos, iter)
87 
88 /* Caller must have rcu_read_lock */
89 #define bond_for_each_slave_rcu(bond, pos, iter) \
90 	netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
91 
92 #define BOND_XFRM_FEATURES (NETIF_F_HW_ESP | NETIF_F_HW_ESP_TX_CSUM | \
93 			    NETIF_F_GSO_ESP)
94 
95 #define BOND_TLS_FEATURES (NETIF_F_HW_TLS_TX | NETIF_F_HW_TLS_RX)
96 
97 #ifdef CONFIG_NET_POLL_CONTROLLER
98 extern atomic_t netpoll_block_tx;
99 
block_netpoll_tx(void)100 static inline void block_netpoll_tx(void)
101 {
102 	atomic_inc(&netpoll_block_tx);
103 }
104 
unblock_netpoll_tx(void)105 static inline void unblock_netpoll_tx(void)
106 {
107 	atomic_dec(&netpoll_block_tx);
108 }
109 
is_netpoll_tx_blocked(struct net_device * dev)110 static inline int is_netpoll_tx_blocked(struct net_device *dev)
111 {
112 	if (unlikely(netpoll_tx_running(dev)))
113 		return atomic_read(&netpoll_block_tx);
114 	return 0;
115 }
116 #else
117 #define block_netpoll_tx()
118 #define unblock_netpoll_tx()
119 #define is_netpoll_tx_blocked(dev) (0)
120 #endif
121 
122 struct bond_params {
123 	int mode;
124 	int xmit_policy;
125 	int miimon;
126 	u8 num_peer_notif;
127 	u8 missed_max;
128 	int arp_interval;
129 	int arp_validate;
130 	int arp_all_targets;
131 	int use_carrier;
132 	int fail_over_mac;
133 	int updelay;
134 	int downdelay;
135 	int peer_notif_delay;
136 	int lacp_active;
137 	int lacp_fast;
138 	unsigned int min_links;
139 	int ad_select;
140 	char primary[IFNAMSIZ];
141 	int primary_reselect;
142 	__be32 arp_targets[BOND_MAX_ARP_TARGETS];
143 	int tx_queues;
144 	int all_slaves_active;
145 	int resend_igmp;
146 	int lp_interval;
147 	int packets_per_slave;
148 	int tlb_dynamic_lb;
149 	struct reciprocal_value reciprocal_packets_per_slave;
150 	u16 ad_actor_sys_prio;
151 	u16 ad_user_port_key;
152 #if IS_ENABLED(CONFIG_IPV6)
153 	struct in6_addr ns_targets[BOND_MAX_NS_TARGETS];
154 #endif
155 
156 	/* 2 bytes of padding : see ether_addr_equal_64bits() */
157 	u8 ad_actor_system[ETH_ALEN + 2];
158 };
159 
160 struct slave {
161 	struct net_device *dev; /* first - useful for panic debug */
162 	struct bonding *bond; /* our master */
163 	int    delay;
164 	/* all 4 in jiffies */
165 	unsigned long last_link_up;
166 	unsigned long last_tx;
167 	unsigned long last_rx;
168 	unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
169 	s8     link;		/* one of BOND_LINK_XXXX */
170 	s8     link_new_state;	/* one of BOND_LINK_XXXX */
171 	u8     backup:1,   /* indicates backup slave. Value corresponds with
172 			      BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
173 	       inactive:1, /* indicates inactive slave */
174 	       should_notify:1, /* indicates whether the state changed */
175 	       should_notify_link:1; /* indicates whether the link changed */
176 	u8     duplex;
177 	u32    original_mtu;
178 	u32    link_failure_count;
179 	u32    speed;
180 	u16    queue_id;
181 	u8     perm_hwaddr[MAX_ADDR_LEN];
182 	int    prio;
183 	struct ad_slave_info *ad_info;
184 	struct tlb_slave_info tlb_info;
185 #ifdef CONFIG_NET_POLL_CONTROLLER
186 	struct netpoll *np;
187 #endif
188 	struct delayed_work notify_work;
189 	struct kobject kobj;
190 	struct rtnl_link_stats64 slave_stats;
191 };
192 
to_slave(struct kobject * kobj)193 static inline struct slave *to_slave(struct kobject *kobj)
194 {
195 	return container_of(kobj, struct slave, kobj);
196 }
197 
198 struct bond_up_slave {
199 	unsigned int	count;
200 	struct rcu_head rcu;
201 	struct slave	*arr[];
202 };
203 
204 /*
205  * Link pseudo-state only used internally by monitors
206  */
207 #define BOND_LINK_NOCHANGE -1
208 
209 struct bond_ipsec {
210 	struct list_head list;
211 	struct xfrm_state *xs;
212 };
213 
214 /*
215  * Here are the locking policies for the two bonding locks:
216  * Get rcu_read_lock when reading or RTNL when writing slave list.
217  */
218 struct bonding {
219 	struct   net_device *dev; /* first - useful for panic debug */
220 	struct   slave __rcu *curr_active_slave;
221 	struct   slave __rcu *current_arp_slave;
222 	struct   slave __rcu *primary_slave;
223 	struct   bond_up_slave __rcu *usable_slaves;
224 	struct   bond_up_slave __rcu *all_slaves;
225 	bool     force_primary;
226 	s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
227 	int     (*recv_probe)(const struct sk_buff *, struct bonding *,
228 			      struct slave *);
229 	/* mode_lock is used for mode-specific locking needs, currently used by:
230 	 * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
231 	 *                bond_3ad_state_machine_handler() concurrently and also
232 	 *                the access to the state machine shared variables.
233 	 * TLB mode (5) - to sync the use and modifications of its hash table
234 	 * ALB mode (6) - to sync the use and modifications of its hash table
235 	 */
236 	spinlock_t mode_lock;
237 	spinlock_t stats_lock;
238 	u8	 send_peer_notif;
239 	u8       igmp_retrans;
240 #ifdef CONFIG_PROC_FS
241 	struct   proc_dir_entry *proc_entry;
242 	char     proc_file_name[IFNAMSIZ];
243 #endif /* CONFIG_PROC_FS */
244 	struct   list_head bond_list;
245 	u32 __percpu *rr_tx_counter;
246 	struct   ad_bond_info ad_info;
247 	struct   alb_bond_info alb_info;
248 	struct   bond_params params;
249 	struct   workqueue_struct *wq;
250 	struct   delayed_work mii_work;
251 	struct   delayed_work arp_work;
252 	struct   delayed_work alb_work;
253 	struct   delayed_work ad_work;
254 	struct   delayed_work mcast_work;
255 	struct   delayed_work slave_arr_work;
256 #ifdef CONFIG_DEBUG_FS
257 	/* debugging support via debugfs */
258 	struct	 dentry *debug_dir;
259 #endif /* CONFIG_DEBUG_FS */
260 	struct rtnl_link_stats64 bond_stats;
261 #ifdef CONFIG_XFRM_OFFLOAD
262 	struct list_head ipsec_list;
263 	/* protecting ipsec_list */
264 	spinlock_t ipsec_lock;
265 #endif /* CONFIG_XFRM_OFFLOAD */
266 	struct bpf_prog *xdp_prog;
267 };
268 
269 #define bond_slave_get_rcu(dev) \
270 	((struct slave *) rcu_dereference(dev->rx_handler_data))
271 
272 #define bond_slave_get_rtnl(dev) \
273 	((struct slave *) rtnl_dereference(dev->rx_handler_data))
274 
275 void bond_queue_slave_event(struct slave *slave);
276 void bond_lower_state_changed(struct slave *slave);
277 
278 struct bond_vlan_tag {
279 	__be16		vlan_proto;
280 	unsigned short	vlan_id;
281 };
282 
283 bool bond_sk_check(struct bonding *bond);
284 
285 /**
286  * Returns NULL if the net_device does not belong to any of the bond's slaves
287  *
288  * Caller must hold bond lock for read
289  */
bond_get_slave_by_dev(struct bonding * bond,struct net_device * slave_dev)290 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
291 						  struct net_device *slave_dev)
292 {
293 	return netdev_lower_dev_get_private(bond->dev, slave_dev);
294 }
295 
bond_get_bond_by_slave(struct slave * slave)296 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
297 {
298 	return slave->bond;
299 }
300 
bond_should_override_tx_queue(struct bonding * bond)301 static inline bool bond_should_override_tx_queue(struct bonding *bond)
302 {
303 	return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
304 	       BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
305 }
306 
bond_is_lb(const struct bonding * bond)307 static inline bool bond_is_lb(const struct bonding *bond)
308 {
309 	return BOND_MODE(bond) == BOND_MODE_TLB ||
310 	       BOND_MODE(bond) == BOND_MODE_ALB;
311 }
312 
bond_needs_speed_duplex(const struct bonding * bond)313 static inline bool bond_needs_speed_duplex(const struct bonding *bond)
314 {
315 	return BOND_MODE(bond) == BOND_MODE_8023AD || bond_is_lb(bond);
316 }
317 
bond_is_nondyn_tlb(const struct bonding * bond)318 static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
319 {
320 	return (bond_is_lb(bond) && bond->params.tlb_dynamic_lb == 0);
321 }
322 
bond_mode_can_use_xmit_hash(const struct bonding * bond)323 static inline bool bond_mode_can_use_xmit_hash(const struct bonding *bond)
324 {
325 	return (BOND_MODE(bond) == BOND_MODE_8023AD ||
326 		BOND_MODE(bond) == BOND_MODE_XOR ||
327 		BOND_MODE(bond) == BOND_MODE_TLB ||
328 		BOND_MODE(bond) == BOND_MODE_ALB);
329 }
330 
bond_mode_uses_xmit_hash(const struct bonding * bond)331 static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)
332 {
333 	return (BOND_MODE(bond) == BOND_MODE_8023AD ||
334 		BOND_MODE(bond) == BOND_MODE_XOR ||
335 		bond_is_nondyn_tlb(bond));
336 }
337 
bond_mode_uses_arp(int mode)338 static inline bool bond_mode_uses_arp(int mode)
339 {
340 	return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
341 	       mode != BOND_MODE_ALB;
342 }
343 
bond_mode_uses_primary(int mode)344 static inline bool bond_mode_uses_primary(int mode)
345 {
346 	return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
347 	       mode == BOND_MODE_ALB;
348 }
349 
bond_uses_primary(struct bonding * bond)350 static inline bool bond_uses_primary(struct bonding *bond)
351 {
352 	return bond_mode_uses_primary(BOND_MODE(bond));
353 }
354 
bond_option_active_slave_get_rcu(struct bonding * bond)355 static inline struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
356 {
357 	struct slave *slave = rcu_dereference_rtnl(bond->curr_active_slave);
358 
359 	return bond_uses_primary(bond) && slave ? slave->dev : NULL;
360 }
361 
bond_slave_is_up(struct slave * slave)362 static inline bool bond_slave_is_up(struct slave *slave)
363 {
364 	return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
365 }
366 
bond_set_active_slave(struct slave * slave)367 static inline void bond_set_active_slave(struct slave *slave)
368 {
369 	if (slave->backup) {
370 		slave->backup = 0;
371 		bond_queue_slave_event(slave);
372 		bond_lower_state_changed(slave);
373 	}
374 }
375 
bond_set_backup_slave(struct slave * slave)376 static inline void bond_set_backup_slave(struct slave *slave)
377 {
378 	if (!slave->backup) {
379 		slave->backup = 1;
380 		bond_queue_slave_event(slave);
381 		bond_lower_state_changed(slave);
382 	}
383 }
384 
bond_set_slave_state(struct slave * slave,int slave_state,bool notify)385 static inline void bond_set_slave_state(struct slave *slave,
386 					int slave_state, bool notify)
387 {
388 	if (slave->backup == slave_state)
389 		return;
390 
391 	slave->backup = slave_state;
392 	if (notify) {
393 		bond_lower_state_changed(slave);
394 		bond_queue_slave_event(slave);
395 		slave->should_notify = 0;
396 	} else {
397 		if (slave->should_notify)
398 			slave->should_notify = 0;
399 		else
400 			slave->should_notify = 1;
401 	}
402 }
403 
bond_slave_state_change(struct bonding * bond)404 static inline void bond_slave_state_change(struct bonding *bond)
405 {
406 	struct list_head *iter;
407 	struct slave *tmp;
408 
409 	bond_for_each_slave(bond, tmp, iter) {
410 		if (tmp->link == BOND_LINK_UP)
411 			bond_set_active_slave(tmp);
412 		else if (tmp->link == BOND_LINK_DOWN)
413 			bond_set_backup_slave(tmp);
414 	}
415 }
416 
bond_slave_state_notify(struct bonding * bond)417 static inline void bond_slave_state_notify(struct bonding *bond)
418 {
419 	struct list_head *iter;
420 	struct slave *tmp;
421 
422 	bond_for_each_slave(bond, tmp, iter) {
423 		if (tmp->should_notify) {
424 			bond_lower_state_changed(tmp);
425 			tmp->should_notify = 0;
426 		}
427 	}
428 }
429 
bond_slave_state(struct slave * slave)430 static inline int bond_slave_state(struct slave *slave)
431 {
432 	return slave->backup;
433 }
434 
bond_is_active_slave(struct slave * slave)435 static inline bool bond_is_active_slave(struct slave *slave)
436 {
437 	return !bond_slave_state(slave);
438 }
439 
bond_slave_can_tx(struct slave * slave)440 static inline bool bond_slave_can_tx(struct slave *slave)
441 {
442 	return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
443 	       bond_is_active_slave(slave);
444 }
445 
bond_is_active_slave_dev(const struct net_device * slave_dev)446 static inline bool bond_is_active_slave_dev(const struct net_device *slave_dev)
447 {
448 	struct slave *slave;
449 	bool active;
450 
451 	rcu_read_lock();
452 	slave = bond_slave_get_rcu(slave_dev);
453 	active = bond_is_active_slave(slave);
454 	rcu_read_unlock();
455 
456 	return active;
457 }
458 
bond_hw_addr_copy(u8 * dst,const u8 * src,unsigned int len)459 static inline void bond_hw_addr_copy(u8 *dst, const u8 *src, unsigned int len)
460 {
461 	if (len == ETH_ALEN) {
462 		ether_addr_copy(dst, src);
463 		return;
464 	}
465 
466 	memcpy(dst, src, len);
467 }
468 
469 #define BOND_PRI_RESELECT_ALWAYS	0
470 #define BOND_PRI_RESELECT_BETTER	1
471 #define BOND_PRI_RESELECT_FAILURE	2
472 
473 #define BOND_FOM_NONE			0
474 #define BOND_FOM_ACTIVE			1
475 #define BOND_FOM_FOLLOW			2
476 
477 #define BOND_ARP_TARGETS_ANY		0
478 #define BOND_ARP_TARGETS_ALL		1
479 
480 #define BOND_ARP_VALIDATE_NONE		0
481 #define BOND_ARP_VALIDATE_ACTIVE	(1 << BOND_STATE_ACTIVE)
482 #define BOND_ARP_VALIDATE_BACKUP	(1 << BOND_STATE_BACKUP)
483 #define BOND_ARP_VALIDATE_ALL		(BOND_ARP_VALIDATE_ACTIVE | \
484 					 BOND_ARP_VALIDATE_BACKUP)
485 #define BOND_ARP_FILTER			(BOND_ARP_VALIDATE_ALL + 1)
486 #define BOND_ARP_FILTER_ACTIVE		(BOND_ARP_VALIDATE_ACTIVE | \
487 					 BOND_ARP_FILTER)
488 #define BOND_ARP_FILTER_BACKUP		(BOND_ARP_VALIDATE_BACKUP | \
489 					 BOND_ARP_FILTER)
490 
491 #define BOND_SLAVE_NOTIFY_NOW		true
492 #define BOND_SLAVE_NOTIFY_LATER		false
493 
slave_do_arp_validate(struct bonding * bond,struct slave * slave)494 static inline int slave_do_arp_validate(struct bonding *bond,
495 					struct slave *slave)
496 {
497 	return bond->params.arp_validate & (1 << bond_slave_state(slave));
498 }
499 
slave_do_arp_validate_only(struct bonding * bond)500 static inline int slave_do_arp_validate_only(struct bonding *bond)
501 {
502 	return bond->params.arp_validate & BOND_ARP_FILTER;
503 }
504 
bond_is_ip_target_ok(__be32 addr)505 static inline int bond_is_ip_target_ok(__be32 addr)
506 {
507 	return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
508 }
509 
510 #if IS_ENABLED(CONFIG_IPV6)
bond_is_ip6_target_ok(struct in6_addr * addr)511 static inline int bond_is_ip6_target_ok(struct in6_addr *addr)
512 {
513 	return !ipv6_addr_any(addr) &&
514 	       !ipv6_addr_loopback(addr) &&
515 	       !ipv6_addr_is_multicast(addr);
516 }
517 #endif
518 
519 /* Get the oldest arp which we've received on this slave for bond's
520  * arp_targets.
521  */
slave_oldest_target_arp_rx(struct bonding * bond,struct slave * slave)522 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
523 						       struct slave *slave)
524 {
525 	int i = 1;
526 	unsigned long ret = slave->target_last_arp_rx[0];
527 
528 	for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
529 		if (time_before(slave->target_last_arp_rx[i], ret))
530 			ret = slave->target_last_arp_rx[i];
531 
532 	return ret;
533 }
534 
slave_last_rx(struct bonding * bond,struct slave * slave)535 static inline unsigned long slave_last_rx(struct bonding *bond,
536 					struct slave *slave)
537 {
538 	if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
539 		return slave_oldest_target_arp_rx(bond, slave);
540 
541 	return slave->last_rx;
542 }
543 
slave_update_last_tx(struct slave * slave)544 static inline void slave_update_last_tx(struct slave *slave)
545 {
546 	WRITE_ONCE(slave->last_tx, jiffies);
547 }
548 
slave_last_tx(struct slave * slave)549 static inline unsigned long slave_last_tx(struct slave *slave)
550 {
551 	return READ_ONCE(slave->last_tx);
552 }
553 
554 #ifdef CONFIG_NET_POLL_CONTROLLER
bond_netpoll_send_skb(const struct slave * slave,struct sk_buff * skb)555 static inline netdev_tx_t bond_netpoll_send_skb(const struct slave *slave,
556 					 struct sk_buff *skb)
557 {
558 	return netpoll_send_skb(slave->np, skb);
559 }
560 #else
bond_netpoll_send_skb(const struct slave * slave,struct sk_buff * skb)561 static inline netdev_tx_t bond_netpoll_send_skb(const struct slave *slave,
562 					 struct sk_buff *skb)
563 {
564 	BUG();
565 	return NETDEV_TX_OK;
566 }
567 #endif
568 
bond_set_slave_inactive_flags(struct slave * slave,bool notify)569 static inline void bond_set_slave_inactive_flags(struct slave *slave,
570 						 bool notify)
571 {
572 	if (!bond_is_lb(slave->bond))
573 		bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
574 	if (!slave->bond->params.all_slaves_active)
575 		slave->inactive = 1;
576 }
577 
bond_set_slave_active_flags(struct slave * slave,bool notify)578 static inline void bond_set_slave_active_flags(struct slave *slave,
579 					       bool notify)
580 {
581 	bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
582 	slave->inactive = 0;
583 }
584 
bond_is_slave_inactive(struct slave * slave)585 static inline bool bond_is_slave_inactive(struct slave *slave)
586 {
587 	return slave->inactive;
588 }
589 
bond_propose_link_state(struct slave * slave,int state)590 static inline void bond_propose_link_state(struct slave *slave, int state)
591 {
592 	slave->link_new_state = state;
593 }
594 
bond_commit_link_state(struct slave * slave,bool notify)595 static inline void bond_commit_link_state(struct slave *slave, bool notify)
596 {
597 	if (slave->link_new_state == BOND_LINK_NOCHANGE)
598 		return;
599 
600 	slave->link = slave->link_new_state;
601 	if (notify) {
602 		bond_queue_slave_event(slave);
603 		bond_lower_state_changed(slave);
604 		slave->should_notify_link = 0;
605 	} else {
606 		if (slave->should_notify_link)
607 			slave->should_notify_link = 0;
608 		else
609 			slave->should_notify_link = 1;
610 	}
611 }
612 
bond_set_slave_link_state(struct slave * slave,int state,bool notify)613 static inline void bond_set_slave_link_state(struct slave *slave, int state,
614 					     bool notify)
615 {
616 	bond_propose_link_state(slave, state);
617 	bond_commit_link_state(slave, notify);
618 }
619 
bond_slave_link_notify(struct bonding * bond)620 static inline void bond_slave_link_notify(struct bonding *bond)
621 {
622 	struct list_head *iter;
623 	struct slave *tmp;
624 
625 	bond_for_each_slave(bond, tmp, iter) {
626 		if (tmp->should_notify_link) {
627 			bond_queue_slave_event(tmp);
628 			bond_lower_state_changed(tmp);
629 			tmp->should_notify_link = 0;
630 		}
631 	}
632 }
633 
bond_confirm_addr(struct net_device * dev,__be32 dst,__be32 local)634 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
635 {
636 	struct in_device *in_dev;
637 	__be32 addr = 0;
638 
639 	rcu_read_lock();
640 	in_dev = __in_dev_get_rcu(dev);
641 
642 	if (in_dev)
643 		addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
644 					 RT_SCOPE_HOST);
645 	rcu_read_unlock();
646 	return addr;
647 }
648 
649 struct bond_net {
650 	struct net		*net;	/* Associated network namespace */
651 	struct list_head	dev_list;
652 #ifdef CONFIG_PROC_FS
653 	struct proc_dir_entry	*proc_dir;
654 #endif
655 	struct class_attribute	class_attr_bonding_masters;
656 };
657 
658 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
659 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
660 int bond_create(struct net *net, const char *name);
661 int bond_create_sysfs(struct bond_net *net);
662 void bond_destroy_sysfs(struct bond_net *net);
663 void bond_prepare_sysfs_group(struct bonding *bond);
664 int bond_sysfs_slave_add(struct slave *slave);
665 void bond_sysfs_slave_del(struct slave *slave);
666 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
667 		 struct netlink_ext_ack *extack);
668 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
669 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
670 int bond_set_carrier(struct bonding *bond);
671 void bond_select_active_slave(struct bonding *bond);
672 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
673 void bond_create_debugfs(void);
674 void bond_destroy_debugfs(void);
675 void bond_debug_register(struct bonding *bond);
676 void bond_debug_unregister(struct bonding *bond);
677 void bond_debug_reregister(struct bonding *bond);
678 const char *bond_mode_name(int mode);
679 void bond_setup(struct net_device *bond_dev);
680 unsigned int bond_get_num_tx_queues(void);
681 int bond_netlink_init(void);
682 void bond_netlink_fini(void);
683 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
684 const char *bond_slave_link_status(s8 link);
685 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
686 					      struct net_device *end_dev,
687 					      int level);
688 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
689 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
690 void bond_work_init_all(struct bonding *bond);
691 
692 #ifdef CONFIG_PROC_FS
693 void bond_create_proc_entry(struct bonding *bond);
694 void bond_remove_proc_entry(struct bonding *bond);
695 void bond_create_proc_dir(struct bond_net *bn);
696 void bond_destroy_proc_dir(struct bond_net *bn);
697 #else
bond_create_proc_entry(struct bonding * bond)698 static inline void bond_create_proc_entry(struct bonding *bond)
699 {
700 }
701 
bond_remove_proc_entry(struct bonding * bond)702 static inline void bond_remove_proc_entry(struct bonding *bond)
703 {
704 }
705 
bond_create_proc_dir(struct bond_net * bn)706 static inline void bond_create_proc_dir(struct bond_net *bn)
707 {
708 }
709 
bond_destroy_proc_dir(struct bond_net * bn)710 static inline void bond_destroy_proc_dir(struct bond_net *bn)
711 {
712 }
713 #endif
714 
bond_slave_has_mac(struct bonding * bond,const u8 * mac)715 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
716 					       const u8 *mac)
717 {
718 	struct list_head *iter;
719 	struct slave *tmp;
720 
721 	bond_for_each_slave(bond, tmp, iter)
722 		if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
723 			return tmp;
724 
725 	return NULL;
726 }
727 
728 /* Caller must hold rcu_read_lock() for read */
bond_slave_has_mac_rx(struct bonding * bond,const u8 * mac)729 static inline bool bond_slave_has_mac_rx(struct bonding *bond, const u8 *mac)
730 {
731 	struct list_head *iter;
732 	struct slave *tmp;
733 	struct netdev_hw_addr *ha;
734 
735 	bond_for_each_slave_rcu(bond, tmp, iter)
736 		if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
737 			return true;
738 
739 	if (netdev_uc_empty(bond->dev))
740 		return false;
741 
742 	netdev_for_each_uc_addr(ha, bond->dev)
743 		if (ether_addr_equal_64bits(mac, ha->addr))
744 			return true;
745 
746 	return false;
747 }
748 
749 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
750  * Returns -1 if not found, index if found
751  */
bond_get_targets_ip(__be32 * targets,__be32 ip)752 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
753 {
754 	int i;
755 
756 	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
757 		if (targets[i] == ip)
758 			return i;
759 		else if (targets[i] == 0)
760 			break;
761 
762 	return -1;
763 }
764 
765 #if IS_ENABLED(CONFIG_IPV6)
bond_get_targets_ip6(struct in6_addr * targets,struct in6_addr * ip)766 static inline int bond_get_targets_ip6(struct in6_addr *targets, struct in6_addr *ip)
767 {
768 	int i;
769 
770 	for (i = 0; i < BOND_MAX_NS_TARGETS; i++)
771 		if (ipv6_addr_equal(&targets[i], ip))
772 			return i;
773 		else if (ipv6_addr_any(&targets[i]))
774 			break;
775 
776 	return -1;
777 }
778 #endif
779 
780 /* exported from bond_main.c */
781 extern unsigned int bond_net_id;
782 
783 /* exported from bond_netlink.c */
784 extern struct rtnl_link_ops bond_link_ops;
785 
786 /* exported from bond_sysfs_slave.c */
787 extern const struct sysfs_ops slave_sysfs_ops;
788 
789 /* exported from bond_3ad.c */
790 extern const u8 lacpdu_mcast_addr[];
791 
bond_tx_drop(struct net_device * dev,struct sk_buff * skb)792 static inline netdev_tx_t bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
793 {
794 	dev_core_stats_tx_dropped_inc(dev);
795 	dev_kfree_skb_any(skb);
796 	return NET_XMIT_DROP;
797 }
798 
799 #endif /* _NET_BONDING_H */
800