xref: /linux/drivers/net/bonding/bond_main.c (revision 26fbb4c8c7c3ee9a4c3b4de555a8587b5a19154e)
1 /*
2  * originally based on the dummy device.
3  *
4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
6  *
7  * bonding.c: an Ethernet Bonding driver
8  *
9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
10  *	Cisco 5500
11  *	Sun Trunking (Solaris)
12  *	Alteon AceDirector Trunks
13  *	Linux Bonding
14  *	and probably many L2 switches ...
15  *
16  * How it works:
17  *    ifconfig bond0 ipaddress netmask up
18  *      will setup a network device, with an ip address.  No mac address
19  *	will be assigned at this time.  The hw mac address will come from
20  *	the first slave bonded to the channel.  All slaves will then use
21  *	this hw mac address.
22  *
23  *    ifconfig bond0 down
24  *         will release all slaves, marking them as down.
25  *
26  *    ifenslave bond0 eth0
27  *	will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
28  *	a: be used as initial mac address
29  *	b: if a hw mac address already is there, eth0's hw mac address
30  *	   will then be set from bond0.
31  *
32  */
33 
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/fcntl.h>
38 #include <linux/interrupt.h>
39 #include <linux/ptrace.h>
40 #include <linux/ioport.h>
41 #include <linux/in.h>
42 #include <net/ip.h>
43 #include <linux/ip.h>
44 #include <linux/icmp.h>
45 #include <linux/icmpv6.h>
46 #include <linux/tcp.h>
47 #include <linux/udp.h>
48 #include <linux/slab.h>
49 #include <linux/string.h>
50 #include <linux/init.h>
51 #include <linux/timer.h>
52 #include <linux/socket.h>
53 #include <linux/ctype.h>
54 #include <linux/inet.h>
55 #include <linux/bitops.h>
56 #include <linux/io.h>
57 #include <asm/dma.h>
58 #include <linux/uaccess.h>
59 #include <linux/errno.h>
60 #include <linux/netdevice.h>
61 #include <linux/inetdevice.h>
62 #include <linux/igmp.h>
63 #include <linux/etherdevice.h>
64 #include <linux/skbuff.h>
65 #include <net/sock.h>
66 #include <linux/rtnetlink.h>
67 #include <linux/smp.h>
68 #include <linux/if_ether.h>
69 #include <net/arp.h>
70 #include <linux/mii.h>
71 #include <linux/ethtool.h>
72 #include <linux/if_vlan.h>
73 #include <linux/if_bonding.h>
74 #include <linux/jiffies.h>
75 #include <linux/preempt.h>
76 #include <net/route.h>
77 #include <net/net_namespace.h>
78 #include <net/netns/generic.h>
79 #include <net/pkt_sched.h>
80 #include <linux/rculist.h>
81 #include <net/flow_dissector.h>
82 #include <net/xfrm.h>
83 #include <net/bonding.h>
84 #include <net/bond_3ad.h>
85 #include <net/bond_alb.h>
86 
87 #include "bonding_priv.h"
88 
89 /*---------------------------- Module parameters ----------------------------*/
90 
91 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
92 
93 static int max_bonds	= BOND_DEFAULT_MAX_BONDS;
94 static int tx_queues	= BOND_DEFAULT_TX_QUEUES;
95 static int num_peer_notif = 1;
96 static int miimon;
97 static int updelay;
98 static int downdelay;
99 static int use_carrier	= 1;
100 static char *mode;
101 static char *primary;
102 static char *primary_reselect;
103 static char *lacp_rate;
104 static int min_links;
105 static char *ad_select;
106 static char *xmit_hash_policy;
107 static int arp_interval;
108 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
109 static char *arp_validate;
110 static char *arp_all_targets;
111 static char *fail_over_mac;
112 static int all_slaves_active;
113 static struct bond_params bonding_defaults;
114 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
115 static int packets_per_slave = 1;
116 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
117 
118 module_param(max_bonds, int, 0);
119 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
120 module_param(tx_queues, int, 0);
121 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
122 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
123 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
124 			       "failover event (alias of num_unsol_na)");
125 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
126 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
127 			       "failover event (alias of num_grat_arp)");
128 module_param(miimon, int, 0);
129 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
130 module_param(updelay, int, 0);
131 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
132 module_param(downdelay, int, 0);
133 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
134 			    "in milliseconds");
135 module_param(use_carrier, int, 0);
136 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
137 			      "0 for off, 1 for on (default)");
138 module_param(mode, charp, 0);
139 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
140 		       "1 for active-backup, 2 for balance-xor, "
141 		       "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
142 		       "6 for balance-alb");
143 module_param(primary, charp, 0);
144 MODULE_PARM_DESC(primary, "Primary network device to use");
145 module_param(primary_reselect, charp, 0);
146 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
147 				   "once it comes up; "
148 				   "0 for always (default), "
149 				   "1 for only if speed of primary is "
150 				   "better, "
151 				   "2 for only on active slave "
152 				   "failure");
153 module_param(lacp_rate, charp, 0);
154 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
155 			    "0 for slow, 1 for fast");
156 module_param(ad_select, charp, 0);
157 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
158 			    "0 for stable (default), 1 for bandwidth, "
159 			    "2 for count");
160 module_param(min_links, int, 0);
161 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
162 
163 module_param(xmit_hash_policy, charp, 0);
164 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
165 				   "0 for layer 2 (default), 1 for layer 3+4, "
166 				   "2 for layer 2+3, 3 for encap layer 2+3, "
167 				   "4 for encap layer 3+4");
168 module_param(arp_interval, int, 0);
169 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
170 module_param_array(arp_ip_target, charp, NULL, 0);
171 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
172 module_param(arp_validate, charp, 0);
173 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
174 			       "0 for none (default), 1 for active, "
175 			       "2 for backup, 3 for all");
176 module_param(arp_all_targets, charp, 0);
177 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
178 module_param(fail_over_mac, charp, 0);
179 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
180 				"the same MAC; 0 for none (default), "
181 				"1 for active, 2 for follow");
182 module_param(all_slaves_active, int, 0);
183 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
184 				     "by setting active flag for all slaves; "
185 				     "0 for never (default), 1 for always.");
186 module_param(resend_igmp, int, 0);
187 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
188 			      "link failure");
189 module_param(packets_per_slave, int, 0);
190 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
191 				    "mode; 0 for a random slave, 1 packet per "
192 				    "slave (default), >1 packets per slave.");
193 module_param(lp_interval, uint, 0);
194 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
195 			      "the bonding driver sends learning packets to "
196 			      "each slaves peer switch. The default is 1.");
197 
198 /*----------------------------- Global variables ----------------------------*/
199 
200 #ifdef CONFIG_NET_POLL_CONTROLLER
201 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
202 #endif
203 
204 unsigned int bond_net_id __read_mostly;
205 
206 static const struct flow_dissector_key flow_keys_bonding_keys[] = {
207 	{
208 		.key_id = FLOW_DISSECTOR_KEY_CONTROL,
209 		.offset = offsetof(struct flow_keys, control),
210 	},
211 	{
212 		.key_id = FLOW_DISSECTOR_KEY_BASIC,
213 		.offset = offsetof(struct flow_keys, basic),
214 	},
215 	{
216 		.key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
217 		.offset = offsetof(struct flow_keys, addrs.v4addrs),
218 	},
219 	{
220 		.key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
221 		.offset = offsetof(struct flow_keys, addrs.v6addrs),
222 	},
223 	{
224 		.key_id = FLOW_DISSECTOR_KEY_TIPC,
225 		.offset = offsetof(struct flow_keys, addrs.tipckey),
226 	},
227 	{
228 		.key_id = FLOW_DISSECTOR_KEY_PORTS,
229 		.offset = offsetof(struct flow_keys, ports),
230 	},
231 	{
232 		.key_id = FLOW_DISSECTOR_KEY_ICMP,
233 		.offset = offsetof(struct flow_keys, icmp),
234 	},
235 	{
236 		.key_id = FLOW_DISSECTOR_KEY_VLAN,
237 		.offset = offsetof(struct flow_keys, vlan),
238 	},
239 	{
240 		.key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
241 		.offset = offsetof(struct flow_keys, tags),
242 	},
243 	{
244 		.key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
245 		.offset = offsetof(struct flow_keys, keyid),
246 	},
247 };
248 
249 static struct flow_dissector flow_keys_bonding __read_mostly;
250 
251 /*-------------------------- Forward declarations ---------------------------*/
252 
253 static int bond_init(struct net_device *bond_dev);
254 static void bond_uninit(struct net_device *bond_dev);
255 static void bond_get_stats(struct net_device *bond_dev,
256 			   struct rtnl_link_stats64 *stats);
257 static void bond_slave_arr_handler(struct work_struct *work);
258 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
259 				  int mod);
260 static void bond_netdev_notify_work(struct work_struct *work);
261 
262 /*---------------------------- General routines -----------------------------*/
263 
264 const char *bond_mode_name(int mode)
265 {
266 	static const char *names[] = {
267 		[BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
268 		[BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
269 		[BOND_MODE_XOR] = "load balancing (xor)",
270 		[BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
271 		[BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
272 		[BOND_MODE_TLB] = "transmit load balancing",
273 		[BOND_MODE_ALB] = "adaptive load balancing",
274 	};
275 
276 	if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
277 		return "unknown";
278 
279 	return names[mode];
280 }
281 
282 /**
283  * bond_dev_queue_xmit - Prepare skb for xmit.
284  *
285  * @bond: bond device that got this skb for tx.
286  * @skb: hw accel VLAN tagged skb to transmit
287  * @slave_dev: slave that is supposed to xmit this skbuff
288  */
289 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
290 			struct net_device *slave_dev)
291 {
292 	skb->dev = slave_dev;
293 
294 	BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
295 		     sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
296 	skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
297 
298 	if (unlikely(netpoll_tx_running(bond->dev)))
299 		return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
300 
301 	return dev_queue_xmit(skb);
302 }
303 
304 /*---------------------------------- VLAN -----------------------------------*/
305 
306 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
307  * We don't protect the slave list iteration with a lock because:
308  * a. This operation is performed in IOCTL context,
309  * b. The operation is protected by the RTNL semaphore in the 8021q code,
310  * c. Holding a lock with BH disabled while directly calling a base driver
311  *    entry point is generally a BAD idea.
312  *
313  * The design of synchronization/protection for this operation in the 8021q
314  * module is good for one or more VLAN devices over a single physical device
315  * and cannot be extended for a teaming solution like bonding, so there is a
316  * potential race condition here where a net device from the vlan group might
317  * be referenced (either by a base driver or the 8021q code) while it is being
318  * removed from the system. However, it turns out we're not making matters
319  * worse, and if it works for regular VLAN usage it will work here too.
320 */
321 
322 /**
323  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
324  * @bond_dev: bonding net device that got called
325  * @proto: network protocol ID
326  * @vid: vlan id being added
327  */
328 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
329 				__be16 proto, u16 vid)
330 {
331 	struct bonding *bond = netdev_priv(bond_dev);
332 	struct slave *slave, *rollback_slave;
333 	struct list_head *iter;
334 	int res;
335 
336 	bond_for_each_slave(bond, slave, iter) {
337 		res = vlan_vid_add(slave->dev, proto, vid);
338 		if (res)
339 			goto unwind;
340 	}
341 
342 	return 0;
343 
344 unwind:
345 	/* unwind to the slave that failed */
346 	bond_for_each_slave(bond, rollback_slave, iter) {
347 		if (rollback_slave == slave)
348 			break;
349 
350 		vlan_vid_del(rollback_slave->dev, proto, vid);
351 	}
352 
353 	return res;
354 }
355 
356 /**
357  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
358  * @bond_dev: bonding net device that got called
359  * @proto: network protocol ID
360  * @vid: vlan id being removed
361  */
362 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
363 				 __be16 proto, u16 vid)
364 {
365 	struct bonding *bond = netdev_priv(bond_dev);
366 	struct list_head *iter;
367 	struct slave *slave;
368 
369 	bond_for_each_slave(bond, slave, iter)
370 		vlan_vid_del(slave->dev, proto, vid);
371 
372 	if (bond_is_lb(bond))
373 		bond_alb_clear_vlan(bond, vid);
374 
375 	return 0;
376 }
377 
378 /*---------------------------------- XFRM -----------------------------------*/
379 
380 #ifdef CONFIG_XFRM_OFFLOAD
381 /**
382  * bond_ipsec_add_sa - program device with a security association
383  * @xs: pointer to transformer state struct
384  **/
385 static int bond_ipsec_add_sa(struct xfrm_state *xs)
386 {
387 	struct net_device *bond_dev = xs->xso.dev;
388 	struct bonding *bond;
389 	struct slave *slave;
390 
391 	if (!bond_dev)
392 		return -EINVAL;
393 
394 	bond = netdev_priv(bond_dev);
395 	slave = rcu_dereference(bond->curr_active_slave);
396 	xs->xso.real_dev = slave->dev;
397 	bond->xs = xs;
398 
399 	if (!(slave->dev->xfrmdev_ops
400 	      && slave->dev->xfrmdev_ops->xdo_dev_state_add)) {
401 		slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n");
402 		return -EINVAL;
403 	}
404 
405 	return slave->dev->xfrmdev_ops->xdo_dev_state_add(xs);
406 }
407 
408 /**
409  * bond_ipsec_del_sa - clear out this specific SA
410  * @xs: pointer to transformer state struct
411  **/
412 static void bond_ipsec_del_sa(struct xfrm_state *xs)
413 {
414 	struct net_device *bond_dev = xs->xso.dev;
415 	struct bonding *bond;
416 	struct slave *slave;
417 
418 	if (!bond_dev)
419 		return;
420 
421 	bond = netdev_priv(bond_dev);
422 	slave = rcu_dereference(bond->curr_active_slave);
423 
424 	if (!slave)
425 		return;
426 
427 	xs->xso.real_dev = slave->dev;
428 
429 	if (!(slave->dev->xfrmdev_ops
430 	      && slave->dev->xfrmdev_ops->xdo_dev_state_delete)) {
431 		slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
432 		return;
433 	}
434 
435 	slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs);
436 }
437 
438 /**
439  * bond_ipsec_offload_ok - can this packet use the xfrm hw offload
440  * @skb: current data packet
441  * @xs: pointer to transformer state struct
442  **/
443 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
444 {
445 	struct net_device *bond_dev = xs->xso.dev;
446 	struct bonding *bond = netdev_priv(bond_dev);
447 	struct slave *curr_active = rcu_dereference(bond->curr_active_slave);
448 	struct net_device *slave_dev = curr_active->dev;
449 
450 	if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
451 		return true;
452 
453 	if (!(slave_dev->xfrmdev_ops
454 	      && slave_dev->xfrmdev_ops->xdo_dev_offload_ok)) {
455 		slave_warn(bond_dev, slave_dev, "%s: no slave xdo_dev_offload_ok\n", __func__);
456 		return false;
457 	}
458 
459 	xs->xso.real_dev = slave_dev;
460 	return slave_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
461 }
462 
463 static const struct xfrmdev_ops bond_xfrmdev_ops = {
464 	.xdo_dev_state_add = bond_ipsec_add_sa,
465 	.xdo_dev_state_delete = bond_ipsec_del_sa,
466 	.xdo_dev_offload_ok = bond_ipsec_offload_ok,
467 };
468 #endif /* CONFIG_XFRM_OFFLOAD */
469 
470 /*------------------------------- Link status -------------------------------*/
471 
472 /* Set the carrier state for the master according to the state of its
473  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
474  * do special 802.3ad magic.
475  *
476  * Returns zero if carrier state does not change, nonzero if it does.
477  */
478 int bond_set_carrier(struct bonding *bond)
479 {
480 	struct list_head *iter;
481 	struct slave *slave;
482 
483 	if (!bond_has_slaves(bond))
484 		goto down;
485 
486 	if (BOND_MODE(bond) == BOND_MODE_8023AD)
487 		return bond_3ad_set_carrier(bond);
488 
489 	bond_for_each_slave(bond, slave, iter) {
490 		if (slave->link == BOND_LINK_UP) {
491 			if (!netif_carrier_ok(bond->dev)) {
492 				netif_carrier_on(bond->dev);
493 				return 1;
494 			}
495 			return 0;
496 		}
497 	}
498 
499 down:
500 	if (netif_carrier_ok(bond->dev)) {
501 		netif_carrier_off(bond->dev);
502 		return 1;
503 	}
504 	return 0;
505 }
506 
507 /* Get link speed and duplex from the slave's base driver
508  * using ethtool. If for some reason the call fails or the
509  * values are invalid, set speed and duplex to -1,
510  * and return. Return 1 if speed or duplex settings are
511  * UNKNOWN; 0 otherwise.
512  */
513 static int bond_update_speed_duplex(struct slave *slave)
514 {
515 	struct net_device *slave_dev = slave->dev;
516 	struct ethtool_link_ksettings ecmd;
517 	int res;
518 
519 	slave->speed = SPEED_UNKNOWN;
520 	slave->duplex = DUPLEX_UNKNOWN;
521 
522 	res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
523 	if (res < 0)
524 		return 1;
525 	if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
526 		return 1;
527 	switch (ecmd.base.duplex) {
528 	case DUPLEX_FULL:
529 	case DUPLEX_HALF:
530 		break;
531 	default:
532 		return 1;
533 	}
534 
535 	slave->speed = ecmd.base.speed;
536 	slave->duplex = ecmd.base.duplex;
537 
538 	return 0;
539 }
540 
541 const char *bond_slave_link_status(s8 link)
542 {
543 	switch (link) {
544 	case BOND_LINK_UP:
545 		return "up";
546 	case BOND_LINK_FAIL:
547 		return "going down";
548 	case BOND_LINK_DOWN:
549 		return "down";
550 	case BOND_LINK_BACK:
551 		return "going back";
552 	default:
553 		return "unknown";
554 	}
555 }
556 
557 /* if <dev> supports MII link status reporting, check its link status.
558  *
559  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
560  * depending upon the setting of the use_carrier parameter.
561  *
562  * Return either BMSR_LSTATUS, meaning that the link is up (or we
563  * can't tell and just pretend it is), or 0, meaning that the link is
564  * down.
565  *
566  * If reporting is non-zero, instead of faking link up, return -1 if
567  * both ETHTOOL and MII ioctls fail (meaning the device does not
568  * support them).  If use_carrier is set, return whatever it says.
569  * It'd be nice if there was a good way to tell if a driver supports
570  * netif_carrier, but there really isn't.
571  */
572 static int bond_check_dev_link(struct bonding *bond,
573 			       struct net_device *slave_dev, int reporting)
574 {
575 	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
576 	int (*ioctl)(struct net_device *, struct ifreq *, int);
577 	struct ifreq ifr;
578 	struct mii_ioctl_data *mii;
579 
580 	if (!reporting && !netif_running(slave_dev))
581 		return 0;
582 
583 	if (bond->params.use_carrier)
584 		return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
585 
586 	/* Try to get link status using Ethtool first. */
587 	if (slave_dev->ethtool_ops->get_link)
588 		return slave_dev->ethtool_ops->get_link(slave_dev) ?
589 			BMSR_LSTATUS : 0;
590 
591 	/* Ethtool can't be used, fallback to MII ioctls. */
592 	ioctl = slave_ops->ndo_do_ioctl;
593 	if (ioctl) {
594 		/* TODO: set pointer to correct ioctl on a per team member
595 		 *       bases to make this more efficient. that is, once
596 		 *       we determine the correct ioctl, we will always
597 		 *       call it and not the others for that team
598 		 *       member.
599 		 */
600 
601 		/* We cannot assume that SIOCGMIIPHY will also read a
602 		 * register; not all network drivers (e.g., e100)
603 		 * support that.
604 		 */
605 
606 		/* Yes, the mii is overlaid on the ifreq.ifr_ifru */
607 		strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
608 		mii = if_mii(&ifr);
609 		if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
610 			mii->reg_num = MII_BMSR;
611 			if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
612 				return mii->val_out & BMSR_LSTATUS;
613 		}
614 	}
615 
616 	/* If reporting, report that either there's no dev->do_ioctl,
617 	 * or both SIOCGMIIREG and get_link failed (meaning that we
618 	 * cannot report link status).  If not reporting, pretend
619 	 * we're ok.
620 	 */
621 	return reporting ? -1 : BMSR_LSTATUS;
622 }
623 
624 /*----------------------------- Multicast list ------------------------------*/
625 
626 /* Push the promiscuity flag down to appropriate slaves */
627 static int bond_set_promiscuity(struct bonding *bond, int inc)
628 {
629 	struct list_head *iter;
630 	int err = 0;
631 
632 	if (bond_uses_primary(bond)) {
633 		struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
634 
635 		if (curr_active)
636 			err = dev_set_promiscuity(curr_active->dev, inc);
637 	} else {
638 		struct slave *slave;
639 
640 		bond_for_each_slave(bond, slave, iter) {
641 			err = dev_set_promiscuity(slave->dev, inc);
642 			if (err)
643 				return err;
644 		}
645 	}
646 	return err;
647 }
648 
649 /* Push the allmulti flag down to all slaves */
650 static int bond_set_allmulti(struct bonding *bond, int inc)
651 {
652 	struct list_head *iter;
653 	int err = 0;
654 
655 	if (bond_uses_primary(bond)) {
656 		struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
657 
658 		if (curr_active)
659 			err = dev_set_allmulti(curr_active->dev, inc);
660 	} else {
661 		struct slave *slave;
662 
663 		bond_for_each_slave(bond, slave, iter) {
664 			err = dev_set_allmulti(slave->dev, inc);
665 			if (err)
666 				return err;
667 		}
668 	}
669 	return err;
670 }
671 
672 /* Retrieve the list of registered multicast addresses for the bonding
673  * device and retransmit an IGMP JOIN request to the current active
674  * slave.
675  */
676 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
677 {
678 	struct bonding *bond = container_of(work, struct bonding,
679 					    mcast_work.work);
680 
681 	if (!rtnl_trylock()) {
682 		queue_delayed_work(bond->wq, &bond->mcast_work, 1);
683 		return;
684 	}
685 	call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
686 
687 	if (bond->igmp_retrans > 1) {
688 		bond->igmp_retrans--;
689 		queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
690 	}
691 	rtnl_unlock();
692 }
693 
694 /* Flush bond's hardware addresses from slave */
695 static void bond_hw_addr_flush(struct net_device *bond_dev,
696 			       struct net_device *slave_dev)
697 {
698 	struct bonding *bond = netdev_priv(bond_dev);
699 
700 	dev_uc_unsync(slave_dev, bond_dev);
701 	dev_mc_unsync(slave_dev, bond_dev);
702 
703 	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
704 		/* del lacpdu mc addr from mc list */
705 		u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
706 
707 		dev_mc_del(slave_dev, lacpdu_multicast);
708 	}
709 }
710 
711 /*--------------------------- Active slave change ---------------------------*/
712 
713 /* Update the hardware address list and promisc/allmulti for the new and
714  * old active slaves (if any).  Modes that are not using primary keep all
715  * slaves up date at all times; only the modes that use primary need to call
716  * this function to swap these settings during a failover.
717  */
718 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
719 			      struct slave *old_active)
720 {
721 	if (old_active) {
722 		if (bond->dev->flags & IFF_PROMISC)
723 			dev_set_promiscuity(old_active->dev, -1);
724 
725 		if (bond->dev->flags & IFF_ALLMULTI)
726 			dev_set_allmulti(old_active->dev, -1);
727 
728 		bond_hw_addr_flush(bond->dev, old_active->dev);
729 	}
730 
731 	if (new_active) {
732 		/* FIXME: Signal errors upstream. */
733 		if (bond->dev->flags & IFF_PROMISC)
734 			dev_set_promiscuity(new_active->dev, 1);
735 
736 		if (bond->dev->flags & IFF_ALLMULTI)
737 			dev_set_allmulti(new_active->dev, 1);
738 
739 		netif_addr_lock_bh(bond->dev);
740 		dev_uc_sync(new_active->dev, bond->dev);
741 		dev_mc_sync(new_active->dev, bond->dev);
742 		netif_addr_unlock_bh(bond->dev);
743 	}
744 }
745 
746 /**
747  * bond_set_dev_addr - clone slave's address to bond
748  * @bond_dev: bond net device
749  * @slave_dev: slave net device
750  *
751  * Should be called with RTNL held.
752  */
753 static int bond_set_dev_addr(struct net_device *bond_dev,
754 			     struct net_device *slave_dev)
755 {
756 	int err;
757 
758 	slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
759 		  bond_dev, slave_dev, slave_dev->addr_len);
760 	err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
761 	if (err)
762 		return err;
763 
764 	memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
765 	bond_dev->addr_assign_type = NET_ADDR_STOLEN;
766 	call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
767 	return 0;
768 }
769 
770 static struct slave *bond_get_old_active(struct bonding *bond,
771 					 struct slave *new_active)
772 {
773 	struct slave *slave;
774 	struct list_head *iter;
775 
776 	bond_for_each_slave(bond, slave, iter) {
777 		if (slave == new_active)
778 			continue;
779 
780 		if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
781 			return slave;
782 	}
783 
784 	return NULL;
785 }
786 
787 /* bond_do_fail_over_mac
788  *
789  * Perform special MAC address swapping for fail_over_mac settings
790  *
791  * Called with RTNL
792  */
793 static void bond_do_fail_over_mac(struct bonding *bond,
794 				  struct slave *new_active,
795 				  struct slave *old_active)
796 {
797 	u8 tmp_mac[MAX_ADDR_LEN];
798 	struct sockaddr_storage ss;
799 	int rv;
800 
801 	switch (bond->params.fail_over_mac) {
802 	case BOND_FOM_ACTIVE:
803 		if (new_active) {
804 			rv = bond_set_dev_addr(bond->dev, new_active->dev);
805 			if (rv)
806 				slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
807 					  -rv);
808 		}
809 		break;
810 	case BOND_FOM_FOLLOW:
811 		/* if new_active && old_active, swap them
812 		 * if just old_active, do nothing (going to no active slave)
813 		 * if just new_active, set new_active to bond's MAC
814 		 */
815 		if (!new_active)
816 			return;
817 
818 		if (!old_active)
819 			old_active = bond_get_old_active(bond, new_active);
820 
821 		if (old_active) {
822 			bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
823 					  new_active->dev->addr_len);
824 			bond_hw_addr_copy(ss.__data,
825 					  old_active->dev->dev_addr,
826 					  old_active->dev->addr_len);
827 			ss.ss_family = new_active->dev->type;
828 		} else {
829 			bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
830 					  bond->dev->addr_len);
831 			ss.ss_family = bond->dev->type;
832 		}
833 
834 		rv = dev_set_mac_address(new_active->dev,
835 					 (struct sockaddr *)&ss, NULL);
836 		if (rv) {
837 			slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
838 				  -rv);
839 			goto out;
840 		}
841 
842 		if (!old_active)
843 			goto out;
844 
845 		bond_hw_addr_copy(ss.__data, tmp_mac,
846 				  new_active->dev->addr_len);
847 		ss.ss_family = old_active->dev->type;
848 
849 		rv = dev_set_mac_address(old_active->dev,
850 					 (struct sockaddr *)&ss, NULL);
851 		if (rv)
852 			slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
853 				  -rv);
854 out:
855 		break;
856 	default:
857 		netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
858 			   bond->params.fail_over_mac);
859 		break;
860 	}
861 
862 }
863 
864 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
865 {
866 	struct slave *prim = rtnl_dereference(bond->primary_slave);
867 	struct slave *curr = rtnl_dereference(bond->curr_active_slave);
868 
869 	if (!prim || prim->link != BOND_LINK_UP) {
870 		if (!curr || curr->link != BOND_LINK_UP)
871 			return NULL;
872 		return curr;
873 	}
874 
875 	if (bond->force_primary) {
876 		bond->force_primary = false;
877 		return prim;
878 	}
879 
880 	if (!curr || curr->link != BOND_LINK_UP)
881 		return prim;
882 
883 	/* At this point, prim and curr are both up */
884 	switch (bond->params.primary_reselect) {
885 	case BOND_PRI_RESELECT_ALWAYS:
886 		return prim;
887 	case BOND_PRI_RESELECT_BETTER:
888 		if (prim->speed < curr->speed)
889 			return curr;
890 		if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
891 			return curr;
892 		return prim;
893 	case BOND_PRI_RESELECT_FAILURE:
894 		return curr;
895 	default:
896 		netdev_err(bond->dev, "impossible primary_reselect %d\n",
897 			   bond->params.primary_reselect);
898 		return curr;
899 	}
900 }
901 
902 /**
903  * bond_find_best_slave - select the best available slave to be the active one
904  * @bond: our bonding struct
905  */
906 static struct slave *bond_find_best_slave(struct bonding *bond)
907 {
908 	struct slave *slave, *bestslave = NULL;
909 	struct list_head *iter;
910 	int mintime = bond->params.updelay;
911 
912 	slave = bond_choose_primary_or_current(bond);
913 	if (slave)
914 		return slave;
915 
916 	bond_for_each_slave(bond, slave, iter) {
917 		if (slave->link == BOND_LINK_UP)
918 			return slave;
919 		if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
920 		    slave->delay < mintime) {
921 			mintime = slave->delay;
922 			bestslave = slave;
923 		}
924 	}
925 
926 	return bestslave;
927 }
928 
929 static bool bond_should_notify_peers(struct bonding *bond)
930 {
931 	struct slave *slave;
932 
933 	rcu_read_lock();
934 	slave = rcu_dereference(bond->curr_active_slave);
935 	rcu_read_unlock();
936 
937 	netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
938 		   slave ? slave->dev->name : "NULL");
939 
940 	if (!slave || !bond->send_peer_notif ||
941 	    bond->send_peer_notif %
942 	    max(1, bond->params.peer_notif_delay) != 0 ||
943 	    !netif_carrier_ok(bond->dev) ||
944 	    test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
945 		return false;
946 
947 	return true;
948 }
949 
950 /**
951  * change_active_interface - change the active slave into the specified one
952  * @bond: our bonding struct
953  * @new_active: the new slave to make the active one
954  *
955  * Set the new slave to the bond's settings and unset them on the old
956  * curr_active_slave.
957  * Setting include flags, mc-list, promiscuity, allmulti, etc.
958  *
959  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
960  * because it is apparently the best available slave we have, even though its
961  * updelay hasn't timed out yet.
962  *
963  * Caller must hold RTNL.
964  */
965 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
966 {
967 	struct slave *old_active;
968 
969 	ASSERT_RTNL();
970 
971 	old_active = rtnl_dereference(bond->curr_active_slave);
972 
973 	if (old_active == new_active)
974 		return;
975 
976 #ifdef CONFIG_XFRM_OFFLOAD
977 	if (old_active && bond->xs)
978 		bond_ipsec_del_sa(bond->xs);
979 #endif /* CONFIG_XFRM_OFFLOAD */
980 
981 	if (new_active) {
982 		new_active->last_link_up = jiffies;
983 
984 		if (new_active->link == BOND_LINK_BACK) {
985 			if (bond_uses_primary(bond)) {
986 				slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
987 					   (bond->params.updelay - new_active->delay) * bond->params.miimon);
988 			}
989 
990 			new_active->delay = 0;
991 			bond_set_slave_link_state(new_active, BOND_LINK_UP,
992 						  BOND_SLAVE_NOTIFY_NOW);
993 
994 			if (BOND_MODE(bond) == BOND_MODE_8023AD)
995 				bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
996 
997 			if (bond_is_lb(bond))
998 				bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
999 		} else {
1000 			if (bond_uses_primary(bond)) {
1001 				slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
1002 			}
1003 		}
1004 	}
1005 
1006 	if (bond_uses_primary(bond))
1007 		bond_hw_addr_swap(bond, new_active, old_active);
1008 
1009 	if (bond_is_lb(bond)) {
1010 		bond_alb_handle_active_change(bond, new_active);
1011 		if (old_active)
1012 			bond_set_slave_inactive_flags(old_active,
1013 						      BOND_SLAVE_NOTIFY_NOW);
1014 		if (new_active)
1015 			bond_set_slave_active_flags(new_active,
1016 						    BOND_SLAVE_NOTIFY_NOW);
1017 	} else {
1018 		rcu_assign_pointer(bond->curr_active_slave, new_active);
1019 	}
1020 
1021 	if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
1022 		if (old_active)
1023 			bond_set_slave_inactive_flags(old_active,
1024 						      BOND_SLAVE_NOTIFY_NOW);
1025 
1026 		if (new_active) {
1027 			bool should_notify_peers = false;
1028 
1029 			bond_set_slave_active_flags(new_active,
1030 						    BOND_SLAVE_NOTIFY_NOW);
1031 
1032 			if (bond->params.fail_over_mac)
1033 				bond_do_fail_over_mac(bond, new_active,
1034 						      old_active);
1035 
1036 			if (netif_running(bond->dev)) {
1037 				bond->send_peer_notif =
1038 					bond->params.num_peer_notif *
1039 					max(1, bond->params.peer_notif_delay);
1040 				should_notify_peers =
1041 					bond_should_notify_peers(bond);
1042 			}
1043 
1044 			call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1045 			if (should_notify_peers) {
1046 				bond->send_peer_notif--;
1047 				call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1048 							 bond->dev);
1049 			}
1050 		}
1051 	}
1052 
1053 #ifdef CONFIG_XFRM_OFFLOAD
1054 	if (new_active && bond->xs) {
1055 		xfrm_dev_state_flush(dev_net(bond->dev), bond->dev, true);
1056 		bond_ipsec_add_sa(bond->xs);
1057 	}
1058 #endif /* CONFIG_XFRM_OFFLOAD */
1059 
1060 	/* resend IGMP joins since active slave has changed or
1061 	 * all were sent on curr_active_slave.
1062 	 * resend only if bond is brought up with the affected
1063 	 * bonding modes and the retransmission is enabled
1064 	 */
1065 	if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1066 	    ((bond_uses_primary(bond) && new_active) ||
1067 	     BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
1068 		bond->igmp_retrans = bond->params.resend_igmp;
1069 		queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1070 	}
1071 }
1072 
1073 /**
1074  * bond_select_active_slave - select a new active slave, if needed
1075  * @bond: our bonding struct
1076  *
1077  * This functions should be called when one of the following occurs:
1078  * - The old curr_active_slave has been released or lost its link.
1079  * - The primary_slave has got its link back.
1080  * - A slave has got its link back and there's no old curr_active_slave.
1081  *
1082  * Caller must hold RTNL.
1083  */
1084 void bond_select_active_slave(struct bonding *bond)
1085 {
1086 	struct slave *best_slave;
1087 	int rv;
1088 
1089 	ASSERT_RTNL();
1090 
1091 	best_slave = bond_find_best_slave(bond);
1092 	if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
1093 		bond_change_active_slave(bond, best_slave);
1094 		rv = bond_set_carrier(bond);
1095 		if (!rv)
1096 			return;
1097 
1098 		if (netif_carrier_ok(bond->dev))
1099 			netdev_info(bond->dev, "active interface up!\n");
1100 		else
1101 			netdev_info(bond->dev, "now running without any active interface!\n");
1102 	}
1103 }
1104 
1105 #ifdef CONFIG_NET_POLL_CONTROLLER
1106 static inline int slave_enable_netpoll(struct slave *slave)
1107 {
1108 	struct netpoll *np;
1109 	int err = 0;
1110 
1111 	np = kzalloc(sizeof(*np), GFP_KERNEL);
1112 	err = -ENOMEM;
1113 	if (!np)
1114 		goto out;
1115 
1116 	err = __netpoll_setup(np, slave->dev);
1117 	if (err) {
1118 		kfree(np);
1119 		goto out;
1120 	}
1121 	slave->np = np;
1122 out:
1123 	return err;
1124 }
1125 static inline void slave_disable_netpoll(struct slave *slave)
1126 {
1127 	struct netpoll *np = slave->np;
1128 
1129 	if (!np)
1130 		return;
1131 
1132 	slave->np = NULL;
1133 
1134 	__netpoll_free(np);
1135 }
1136 
1137 static void bond_poll_controller(struct net_device *bond_dev)
1138 {
1139 	struct bonding *bond = netdev_priv(bond_dev);
1140 	struct slave *slave = NULL;
1141 	struct list_head *iter;
1142 	struct ad_info ad_info;
1143 
1144 	if (BOND_MODE(bond) == BOND_MODE_8023AD)
1145 		if (bond_3ad_get_active_agg_info(bond, &ad_info))
1146 			return;
1147 
1148 	bond_for_each_slave_rcu(bond, slave, iter) {
1149 		if (!bond_slave_is_up(slave))
1150 			continue;
1151 
1152 		if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1153 			struct aggregator *agg =
1154 			    SLAVE_AD_INFO(slave)->port.aggregator;
1155 
1156 			if (agg &&
1157 			    agg->aggregator_identifier != ad_info.aggregator_id)
1158 				continue;
1159 		}
1160 
1161 		netpoll_poll_dev(slave->dev);
1162 	}
1163 }
1164 
1165 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1166 {
1167 	struct bonding *bond = netdev_priv(bond_dev);
1168 	struct list_head *iter;
1169 	struct slave *slave;
1170 
1171 	bond_for_each_slave(bond, slave, iter)
1172 		if (bond_slave_is_up(slave))
1173 			slave_disable_netpoll(slave);
1174 }
1175 
1176 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1177 {
1178 	struct bonding *bond = netdev_priv(dev);
1179 	struct list_head *iter;
1180 	struct slave *slave;
1181 	int err = 0;
1182 
1183 	bond_for_each_slave(bond, slave, iter) {
1184 		err = slave_enable_netpoll(slave);
1185 		if (err) {
1186 			bond_netpoll_cleanup(dev);
1187 			break;
1188 		}
1189 	}
1190 	return err;
1191 }
1192 #else
1193 static inline int slave_enable_netpoll(struct slave *slave)
1194 {
1195 	return 0;
1196 }
1197 static inline void slave_disable_netpoll(struct slave *slave)
1198 {
1199 }
1200 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1201 {
1202 }
1203 #endif
1204 
1205 /*---------------------------------- IOCTL ----------------------------------*/
1206 
1207 static netdev_features_t bond_fix_features(struct net_device *dev,
1208 					   netdev_features_t features)
1209 {
1210 	struct bonding *bond = netdev_priv(dev);
1211 	struct list_head *iter;
1212 	netdev_features_t mask;
1213 	struct slave *slave;
1214 
1215 	mask = features;
1216 
1217 	features &= ~NETIF_F_ONE_FOR_ALL;
1218 	features |= NETIF_F_ALL_FOR_ALL;
1219 
1220 	bond_for_each_slave(bond, slave, iter) {
1221 		features = netdev_increment_features(features,
1222 						     slave->dev->features,
1223 						     mask);
1224 	}
1225 	features = netdev_add_tso_features(features, mask);
1226 
1227 	return features;
1228 }
1229 
1230 #define BOND_VLAN_FEATURES	(NETIF_F_HW_CSUM | NETIF_F_SG | \
1231 				 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \
1232 				 NETIF_F_HIGHDMA | NETIF_F_LRO)
1233 
1234 #define BOND_ENC_FEATURES	(NETIF_F_HW_CSUM | NETIF_F_SG | \
1235 				 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE)
1236 
1237 #define BOND_MPLS_FEATURES	(NETIF_F_HW_CSUM | NETIF_F_SG | \
1238 				 NETIF_F_GSO_SOFTWARE)
1239 
1240 
1241 static void bond_compute_features(struct bonding *bond)
1242 {
1243 	unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1244 					IFF_XMIT_DST_RELEASE_PERM;
1245 	netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1246 	netdev_features_t enc_features  = BOND_ENC_FEATURES;
1247 #ifdef CONFIG_XFRM_OFFLOAD
1248 	netdev_features_t xfrm_features  = BOND_XFRM_FEATURES;
1249 #endif /* CONFIG_XFRM_OFFLOAD */
1250 	netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
1251 	struct net_device *bond_dev = bond->dev;
1252 	struct list_head *iter;
1253 	struct slave *slave;
1254 	unsigned short max_hard_header_len = ETH_HLEN;
1255 	unsigned int gso_max_size = GSO_MAX_SIZE;
1256 	u16 gso_max_segs = GSO_MAX_SEGS;
1257 
1258 	if (!bond_has_slaves(bond))
1259 		goto done;
1260 	vlan_features &= NETIF_F_ALL_FOR_ALL;
1261 	mpls_features &= NETIF_F_ALL_FOR_ALL;
1262 
1263 	bond_for_each_slave(bond, slave, iter) {
1264 		vlan_features = netdev_increment_features(vlan_features,
1265 			slave->dev->vlan_features, BOND_VLAN_FEATURES);
1266 
1267 		enc_features = netdev_increment_features(enc_features,
1268 							 slave->dev->hw_enc_features,
1269 							 BOND_ENC_FEATURES);
1270 
1271 #ifdef CONFIG_XFRM_OFFLOAD
1272 		xfrm_features = netdev_increment_features(xfrm_features,
1273 							  slave->dev->hw_enc_features,
1274 							  BOND_XFRM_FEATURES);
1275 #endif /* CONFIG_XFRM_OFFLOAD */
1276 
1277 		mpls_features = netdev_increment_features(mpls_features,
1278 							  slave->dev->mpls_features,
1279 							  BOND_MPLS_FEATURES);
1280 
1281 		dst_release_flag &= slave->dev->priv_flags;
1282 		if (slave->dev->hard_header_len > max_hard_header_len)
1283 			max_hard_header_len = slave->dev->hard_header_len;
1284 
1285 		gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1286 		gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1287 	}
1288 	bond_dev->hard_header_len = max_hard_header_len;
1289 
1290 done:
1291 	bond_dev->vlan_features = vlan_features;
1292 	bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1293 				    NETIF_F_HW_VLAN_CTAG_TX |
1294 				    NETIF_F_HW_VLAN_STAG_TX;
1295 #ifdef CONFIG_XFRM_OFFLOAD
1296 	bond_dev->hw_enc_features |= xfrm_features;
1297 #endif /* CONFIG_XFRM_OFFLOAD */
1298 	bond_dev->mpls_features = mpls_features;
1299 	bond_dev->gso_max_segs = gso_max_segs;
1300 	netif_set_gso_max_size(bond_dev, gso_max_size);
1301 
1302 	bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1303 	if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1304 	    dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1305 		bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1306 
1307 	netdev_change_features(bond_dev);
1308 }
1309 
1310 static void bond_setup_by_slave(struct net_device *bond_dev,
1311 				struct net_device *slave_dev)
1312 {
1313 	bond_dev->header_ops	    = slave_dev->header_ops;
1314 
1315 	bond_dev->type		    = slave_dev->type;
1316 	bond_dev->hard_header_len   = slave_dev->hard_header_len;
1317 	bond_dev->needed_headroom   = slave_dev->needed_headroom;
1318 	bond_dev->addr_len	    = slave_dev->addr_len;
1319 
1320 	memcpy(bond_dev->broadcast, slave_dev->broadcast,
1321 		slave_dev->addr_len);
1322 }
1323 
1324 /* On bonding slaves other than the currently active slave, suppress
1325  * duplicates except for alb non-mcast/bcast.
1326  */
1327 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1328 					    struct slave *slave,
1329 					    struct bonding *bond)
1330 {
1331 	if (bond_is_slave_inactive(slave)) {
1332 		if (BOND_MODE(bond) == BOND_MODE_ALB &&
1333 		    skb->pkt_type != PACKET_BROADCAST &&
1334 		    skb->pkt_type != PACKET_MULTICAST)
1335 			return false;
1336 		return true;
1337 	}
1338 	return false;
1339 }
1340 
1341 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1342 {
1343 	struct sk_buff *skb = *pskb;
1344 	struct slave *slave;
1345 	struct bonding *bond;
1346 	int (*recv_probe)(const struct sk_buff *, struct bonding *,
1347 			  struct slave *);
1348 	int ret = RX_HANDLER_ANOTHER;
1349 
1350 	skb = skb_share_check(skb, GFP_ATOMIC);
1351 	if (unlikely(!skb))
1352 		return RX_HANDLER_CONSUMED;
1353 
1354 	*pskb = skb;
1355 
1356 	slave = bond_slave_get_rcu(skb->dev);
1357 	bond = slave->bond;
1358 
1359 	recv_probe = READ_ONCE(bond->recv_probe);
1360 	if (recv_probe) {
1361 		ret = recv_probe(skb, bond, slave);
1362 		if (ret == RX_HANDLER_CONSUMED) {
1363 			consume_skb(skb);
1364 			return ret;
1365 		}
1366 	}
1367 
1368 	/*
1369 	 * For packets determined by bond_should_deliver_exact_match() call to
1370 	 * be suppressed we want to make an exception for link-local packets.
1371 	 * This is necessary for e.g. LLDP daemons to be able to monitor
1372 	 * inactive slave links without being forced to bind to them
1373 	 * explicitly.
1374 	 *
1375 	 * At the same time, packets that are passed to the bonding master
1376 	 * (including link-local ones) can have their originating interface
1377 	 * determined via PACKET_ORIGDEV socket option.
1378 	 */
1379 	if (bond_should_deliver_exact_match(skb, slave, bond)) {
1380 		if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1381 			return RX_HANDLER_PASS;
1382 		return RX_HANDLER_EXACT;
1383 	}
1384 
1385 	skb->dev = bond->dev;
1386 
1387 	if (BOND_MODE(bond) == BOND_MODE_ALB &&
1388 	    netif_is_bridge_port(bond->dev) &&
1389 	    skb->pkt_type == PACKET_HOST) {
1390 
1391 		if (unlikely(skb_cow_head(skb,
1392 					  skb->data - skb_mac_header(skb)))) {
1393 			kfree_skb(skb);
1394 			return RX_HANDLER_CONSUMED;
1395 		}
1396 		bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1397 				  bond->dev->addr_len);
1398 	}
1399 
1400 	return ret;
1401 }
1402 
1403 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1404 {
1405 	switch (BOND_MODE(bond)) {
1406 	case BOND_MODE_ROUNDROBIN:
1407 		return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1408 	case BOND_MODE_ACTIVEBACKUP:
1409 		return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1410 	case BOND_MODE_BROADCAST:
1411 		return NETDEV_LAG_TX_TYPE_BROADCAST;
1412 	case BOND_MODE_XOR:
1413 	case BOND_MODE_8023AD:
1414 		return NETDEV_LAG_TX_TYPE_HASH;
1415 	default:
1416 		return NETDEV_LAG_TX_TYPE_UNKNOWN;
1417 	}
1418 }
1419 
1420 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1421 					       enum netdev_lag_tx_type type)
1422 {
1423 	if (type != NETDEV_LAG_TX_TYPE_HASH)
1424 		return NETDEV_LAG_HASH_NONE;
1425 
1426 	switch (bond->params.xmit_policy) {
1427 	case BOND_XMIT_POLICY_LAYER2:
1428 		return NETDEV_LAG_HASH_L2;
1429 	case BOND_XMIT_POLICY_LAYER34:
1430 		return NETDEV_LAG_HASH_L34;
1431 	case BOND_XMIT_POLICY_LAYER23:
1432 		return NETDEV_LAG_HASH_L23;
1433 	case BOND_XMIT_POLICY_ENCAP23:
1434 		return NETDEV_LAG_HASH_E23;
1435 	case BOND_XMIT_POLICY_ENCAP34:
1436 		return NETDEV_LAG_HASH_E34;
1437 	default:
1438 		return NETDEV_LAG_HASH_UNKNOWN;
1439 	}
1440 }
1441 
1442 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1443 				      struct netlink_ext_ack *extack)
1444 {
1445 	struct netdev_lag_upper_info lag_upper_info;
1446 	enum netdev_lag_tx_type type;
1447 
1448 	type = bond_lag_tx_type(bond);
1449 	lag_upper_info.tx_type = type;
1450 	lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1451 
1452 	return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1453 					    &lag_upper_info, extack);
1454 }
1455 
1456 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1457 {
1458 	netdev_upper_dev_unlink(slave->dev, bond->dev);
1459 	slave->dev->flags &= ~IFF_SLAVE;
1460 }
1461 
1462 static void slave_kobj_release(struct kobject *kobj)
1463 {
1464 	struct slave *slave = to_slave(kobj);
1465 	struct bonding *bond = bond_get_bond_by_slave(slave);
1466 
1467 	cancel_delayed_work_sync(&slave->notify_work);
1468 	if (BOND_MODE(bond) == BOND_MODE_8023AD)
1469 		kfree(SLAVE_AD_INFO(slave));
1470 
1471 	kfree(slave);
1472 }
1473 
1474 static struct kobj_type slave_ktype = {
1475 	.release = slave_kobj_release,
1476 #ifdef CONFIG_SYSFS
1477 	.sysfs_ops = &slave_sysfs_ops,
1478 #endif
1479 };
1480 
1481 static int bond_kobj_init(struct slave *slave)
1482 {
1483 	int err;
1484 
1485 	err = kobject_init_and_add(&slave->kobj, &slave_ktype,
1486 				   &(slave->dev->dev.kobj), "bonding_slave");
1487 	if (err)
1488 		kobject_put(&slave->kobj);
1489 
1490 	return err;
1491 }
1492 
1493 static struct slave *bond_alloc_slave(struct bonding *bond,
1494 				      struct net_device *slave_dev)
1495 {
1496 	struct slave *slave = NULL;
1497 
1498 	slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1499 	if (!slave)
1500 		return NULL;
1501 
1502 	slave->bond = bond;
1503 	slave->dev = slave_dev;
1504 
1505 	if (bond_kobj_init(slave))
1506 		return NULL;
1507 
1508 	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1509 		SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1510 					       GFP_KERNEL);
1511 		if (!SLAVE_AD_INFO(slave)) {
1512 			kobject_put(&slave->kobj);
1513 			return NULL;
1514 		}
1515 	}
1516 	INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1517 
1518 	return slave;
1519 }
1520 
1521 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1522 {
1523 	info->bond_mode = BOND_MODE(bond);
1524 	info->miimon = bond->params.miimon;
1525 	info->num_slaves = bond->slave_cnt;
1526 }
1527 
1528 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1529 {
1530 	strcpy(info->slave_name, slave->dev->name);
1531 	info->link = slave->link;
1532 	info->state = bond_slave_state(slave);
1533 	info->link_failure_count = slave->link_failure_count;
1534 }
1535 
1536 static void bond_netdev_notify_work(struct work_struct *_work)
1537 {
1538 	struct slave *slave = container_of(_work, struct slave,
1539 					   notify_work.work);
1540 
1541 	if (rtnl_trylock()) {
1542 		struct netdev_bonding_info binfo;
1543 
1544 		bond_fill_ifslave(slave, &binfo.slave);
1545 		bond_fill_ifbond(slave->bond, &binfo.master);
1546 		netdev_bonding_info_change(slave->dev, &binfo);
1547 		rtnl_unlock();
1548 	} else {
1549 		queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1550 	}
1551 }
1552 
1553 void bond_queue_slave_event(struct slave *slave)
1554 {
1555 	queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1556 }
1557 
1558 void bond_lower_state_changed(struct slave *slave)
1559 {
1560 	struct netdev_lag_lower_state_info info;
1561 
1562 	info.link_up = slave->link == BOND_LINK_UP ||
1563 		       slave->link == BOND_LINK_FAIL;
1564 	info.tx_enabled = bond_is_active_slave(slave);
1565 	netdev_lower_state_changed(slave->dev, &info);
1566 }
1567 
1568 /* enslave device <slave> to bond device <master> */
1569 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1570 		 struct netlink_ext_ack *extack)
1571 {
1572 	struct bonding *bond = netdev_priv(bond_dev);
1573 	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1574 	struct slave *new_slave = NULL, *prev_slave;
1575 	struct sockaddr_storage ss;
1576 	int link_reporting;
1577 	int res = 0, i;
1578 
1579 	if (!bond->params.use_carrier &&
1580 	    slave_dev->ethtool_ops->get_link == NULL &&
1581 	    slave_ops->ndo_do_ioctl == NULL) {
1582 		slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1583 	}
1584 
1585 	/* already in-use? */
1586 	if (netdev_is_rx_handler_busy(slave_dev)) {
1587 		NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1588 		slave_err(bond_dev, slave_dev,
1589 			  "Error: Device is in use and cannot be enslaved\n");
1590 		return -EBUSY;
1591 	}
1592 
1593 	if (bond_dev == slave_dev) {
1594 		NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1595 		netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1596 		return -EPERM;
1597 	}
1598 
1599 	/* vlan challenged mutual exclusion */
1600 	/* no need to lock since we're protected by rtnl_lock */
1601 	if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1602 		slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1603 		if (vlan_uses_dev(bond_dev)) {
1604 			NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1605 			slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n");
1606 			return -EPERM;
1607 		} else {
1608 			slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1609 		}
1610 	} else {
1611 		slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1612 	}
1613 
1614 	if (slave_dev->features & NETIF_F_HW_ESP)
1615 		slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");
1616 
1617 	/* Old ifenslave binaries are no longer supported.  These can
1618 	 * be identified with moderate accuracy by the state of the slave:
1619 	 * the current ifenslave will set the interface down prior to
1620 	 * enslaving it; the old ifenslave will not.
1621 	 */
1622 	if (slave_dev->flags & IFF_UP) {
1623 		NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1624 		slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n");
1625 		return -EPERM;
1626 	}
1627 
1628 	/* set bonding device ether type by slave - bonding netdevices are
1629 	 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1630 	 * there is a need to override some of the type dependent attribs/funcs.
1631 	 *
1632 	 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1633 	 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1634 	 */
1635 	if (!bond_has_slaves(bond)) {
1636 		if (bond_dev->type != slave_dev->type) {
1637 			slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1638 				  bond_dev->type, slave_dev->type);
1639 
1640 			res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1641 						       bond_dev);
1642 			res = notifier_to_errno(res);
1643 			if (res) {
1644 				slave_err(bond_dev, slave_dev, "refused to change device type\n");
1645 				return -EBUSY;
1646 			}
1647 
1648 			/* Flush unicast and multicast addresses */
1649 			dev_uc_flush(bond_dev);
1650 			dev_mc_flush(bond_dev);
1651 
1652 			if (slave_dev->type != ARPHRD_ETHER)
1653 				bond_setup_by_slave(bond_dev, slave_dev);
1654 			else {
1655 				ether_setup(bond_dev);
1656 				bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1657 			}
1658 
1659 			call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1660 						 bond_dev);
1661 		}
1662 	} else if (bond_dev->type != slave_dev->type) {
1663 		NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1664 		slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n",
1665 			  slave_dev->type, bond_dev->type);
1666 		return -EINVAL;
1667 	}
1668 
1669 	if (slave_dev->type == ARPHRD_INFINIBAND &&
1670 	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1671 		NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1672 		slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n",
1673 			   slave_dev->type);
1674 		res = -EOPNOTSUPP;
1675 		goto err_undo_flags;
1676 	}
1677 
1678 	if (!slave_ops->ndo_set_mac_address ||
1679 	    slave_dev->type == ARPHRD_INFINIBAND) {
1680 		slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1681 		if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1682 		    bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1683 			if (!bond_has_slaves(bond)) {
1684 				bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1685 				slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1686 			} else {
1687 				NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1688 				slave_err(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1689 				res = -EOPNOTSUPP;
1690 				goto err_undo_flags;
1691 			}
1692 		}
1693 	}
1694 
1695 	call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1696 
1697 	/* If this is the first slave, then we need to set the master's hardware
1698 	 * address to be the same as the slave's.
1699 	 */
1700 	if (!bond_has_slaves(bond) &&
1701 	    bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1702 		res = bond_set_dev_addr(bond->dev, slave_dev);
1703 		if (res)
1704 			goto err_undo_flags;
1705 	}
1706 
1707 	new_slave = bond_alloc_slave(bond, slave_dev);
1708 	if (!new_slave) {
1709 		res = -ENOMEM;
1710 		goto err_undo_flags;
1711 	}
1712 
1713 	/* Set the new_slave's queue_id to be zero.  Queue ID mapping
1714 	 * is set via sysfs or module option if desired.
1715 	 */
1716 	new_slave->queue_id = 0;
1717 
1718 	/* Save slave's original mtu and then set it to match the bond */
1719 	new_slave->original_mtu = slave_dev->mtu;
1720 	res = dev_set_mtu(slave_dev, bond->dev->mtu);
1721 	if (res) {
1722 		slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1723 		goto err_free;
1724 	}
1725 
1726 	/* Save slave's original ("permanent") mac address for modes
1727 	 * that need it, and for restoring it upon release, and then
1728 	 * set it to the master's address
1729 	 */
1730 	bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1731 			  slave_dev->addr_len);
1732 
1733 	if (!bond->params.fail_over_mac ||
1734 	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1735 		/* Set slave to master's mac address.  The application already
1736 		 * set the master's mac address to that of the first slave
1737 		 */
1738 		memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1739 		ss.ss_family = slave_dev->type;
1740 		res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1741 					  extack);
1742 		if (res) {
1743 			slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1744 			goto err_restore_mtu;
1745 		}
1746 	}
1747 
1748 	/* set slave flag before open to prevent IPv6 addrconf */
1749 	slave_dev->flags |= IFF_SLAVE;
1750 
1751 	/* open the slave since the application closed it */
1752 	res = dev_open(slave_dev, extack);
1753 	if (res) {
1754 		slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1755 		goto err_restore_mac;
1756 	}
1757 
1758 	slave_dev->priv_flags |= IFF_BONDING;
1759 	/* initialize slave stats */
1760 	dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1761 
1762 	if (bond_is_lb(bond)) {
1763 		/* bond_alb_init_slave() must be called before all other stages since
1764 		 * it might fail and we do not want to have to undo everything
1765 		 */
1766 		res = bond_alb_init_slave(bond, new_slave);
1767 		if (res)
1768 			goto err_close;
1769 	}
1770 
1771 	res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1772 	if (res) {
1773 		slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1774 		goto err_close;
1775 	}
1776 
1777 	prev_slave = bond_last_slave(bond);
1778 
1779 	new_slave->delay = 0;
1780 	new_slave->link_failure_count = 0;
1781 
1782 	if (bond_update_speed_duplex(new_slave) &&
1783 	    bond_needs_speed_duplex(bond))
1784 		new_slave->link = BOND_LINK_DOWN;
1785 
1786 	new_slave->last_rx = jiffies -
1787 		(msecs_to_jiffies(bond->params.arp_interval) + 1);
1788 	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1789 		new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1790 
1791 	if (bond->params.miimon && !bond->params.use_carrier) {
1792 		link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1793 
1794 		if ((link_reporting == -1) && !bond->params.arp_interval) {
1795 			/* miimon is set but a bonded network driver
1796 			 * does not support ETHTOOL/MII and
1797 			 * arp_interval is not set.  Note: if
1798 			 * use_carrier is enabled, we will never go
1799 			 * here (because netif_carrier is always
1800 			 * supported); thus, we don't need to change
1801 			 * the messages for netif_carrier.
1802 			 */
1803 			slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n");
1804 		} else if (link_reporting == -1) {
1805 			/* unable get link status using mii/ethtool */
1806 			slave_warn(bond_dev, slave_dev, "can't get link status from slave; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n");
1807 		}
1808 	}
1809 
1810 	/* check for initial state */
1811 	new_slave->link = BOND_LINK_NOCHANGE;
1812 	if (bond->params.miimon) {
1813 		if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1814 			if (bond->params.updelay) {
1815 				bond_set_slave_link_state(new_slave,
1816 							  BOND_LINK_BACK,
1817 							  BOND_SLAVE_NOTIFY_NOW);
1818 				new_slave->delay = bond->params.updelay;
1819 			} else {
1820 				bond_set_slave_link_state(new_slave,
1821 							  BOND_LINK_UP,
1822 							  BOND_SLAVE_NOTIFY_NOW);
1823 			}
1824 		} else {
1825 			bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1826 						  BOND_SLAVE_NOTIFY_NOW);
1827 		}
1828 	} else if (bond->params.arp_interval) {
1829 		bond_set_slave_link_state(new_slave,
1830 					  (netif_carrier_ok(slave_dev) ?
1831 					  BOND_LINK_UP : BOND_LINK_DOWN),
1832 					  BOND_SLAVE_NOTIFY_NOW);
1833 	} else {
1834 		bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1835 					  BOND_SLAVE_NOTIFY_NOW);
1836 	}
1837 
1838 	if (new_slave->link != BOND_LINK_DOWN)
1839 		new_slave->last_link_up = jiffies;
1840 	slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
1841 		  new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1842 		  (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1843 
1844 	if (bond_uses_primary(bond) && bond->params.primary[0]) {
1845 		/* if there is a primary slave, remember it */
1846 		if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1847 			rcu_assign_pointer(bond->primary_slave, new_slave);
1848 			bond->force_primary = true;
1849 		}
1850 	}
1851 
1852 	switch (BOND_MODE(bond)) {
1853 	case BOND_MODE_ACTIVEBACKUP:
1854 		bond_set_slave_inactive_flags(new_slave,
1855 					      BOND_SLAVE_NOTIFY_NOW);
1856 		break;
1857 	case BOND_MODE_8023AD:
1858 		/* in 802.3ad mode, the internal mechanism
1859 		 * will activate the slaves in the selected
1860 		 * aggregator
1861 		 */
1862 		bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1863 		/* if this is the first slave */
1864 		if (!prev_slave) {
1865 			SLAVE_AD_INFO(new_slave)->id = 1;
1866 			/* Initialize AD with the number of times that the AD timer is called in 1 second
1867 			 * can be called only after the mac address of the bond is set
1868 			 */
1869 			bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1870 		} else {
1871 			SLAVE_AD_INFO(new_slave)->id =
1872 				SLAVE_AD_INFO(prev_slave)->id + 1;
1873 		}
1874 
1875 		bond_3ad_bind_slave(new_slave);
1876 		break;
1877 	case BOND_MODE_TLB:
1878 	case BOND_MODE_ALB:
1879 		bond_set_active_slave(new_slave);
1880 		bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1881 		break;
1882 	default:
1883 		slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
1884 
1885 		/* always active in trunk mode */
1886 		bond_set_active_slave(new_slave);
1887 
1888 		/* In trunking mode there is little meaning to curr_active_slave
1889 		 * anyway (it holds no special properties of the bond device),
1890 		 * so we can change it without calling change_active_interface()
1891 		 */
1892 		if (!rcu_access_pointer(bond->curr_active_slave) &&
1893 		    new_slave->link == BOND_LINK_UP)
1894 			rcu_assign_pointer(bond->curr_active_slave, new_slave);
1895 
1896 		break;
1897 	} /* switch(bond_mode) */
1898 
1899 #ifdef CONFIG_NET_POLL_CONTROLLER
1900 	if (bond->dev->npinfo) {
1901 		if (slave_enable_netpoll(new_slave)) {
1902 			slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1903 			res = -EBUSY;
1904 			goto err_detach;
1905 		}
1906 	}
1907 #endif
1908 
1909 	if (!(bond_dev->features & NETIF_F_LRO))
1910 		dev_disable_lro(slave_dev);
1911 
1912 	res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1913 					 new_slave);
1914 	if (res) {
1915 		slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
1916 		goto err_detach;
1917 	}
1918 
1919 	res = bond_master_upper_dev_link(bond, new_slave, extack);
1920 	if (res) {
1921 		slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1922 		goto err_unregister;
1923 	}
1924 
1925 	res = bond_sysfs_slave_add(new_slave);
1926 	if (res) {
1927 		slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1928 		goto err_upper_unlink;
1929 	}
1930 
1931 	/* If the mode uses primary, then the following is handled by
1932 	 * bond_change_active_slave().
1933 	 */
1934 	if (!bond_uses_primary(bond)) {
1935 		/* set promiscuity level to new slave */
1936 		if (bond_dev->flags & IFF_PROMISC) {
1937 			res = dev_set_promiscuity(slave_dev, 1);
1938 			if (res)
1939 				goto err_sysfs_del;
1940 		}
1941 
1942 		/* set allmulti level to new slave */
1943 		if (bond_dev->flags & IFF_ALLMULTI) {
1944 			res = dev_set_allmulti(slave_dev, 1);
1945 			if (res) {
1946 				if (bond_dev->flags & IFF_PROMISC)
1947 					dev_set_promiscuity(slave_dev, -1);
1948 				goto err_sysfs_del;
1949 			}
1950 		}
1951 
1952 		netif_addr_lock_bh(bond_dev);
1953 		dev_mc_sync_multiple(slave_dev, bond_dev);
1954 		dev_uc_sync_multiple(slave_dev, bond_dev);
1955 		netif_addr_unlock_bh(bond_dev);
1956 
1957 		if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1958 			/* add lacpdu mc addr to mc list */
1959 			u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1960 
1961 			dev_mc_add(slave_dev, lacpdu_multicast);
1962 		}
1963 	}
1964 
1965 	bond->slave_cnt++;
1966 	bond_compute_features(bond);
1967 	bond_set_carrier(bond);
1968 
1969 	if (bond_uses_primary(bond)) {
1970 		block_netpoll_tx();
1971 		bond_select_active_slave(bond);
1972 		unblock_netpoll_tx();
1973 	}
1974 
1975 	if (bond_mode_can_use_xmit_hash(bond))
1976 		bond_update_slave_arr(bond, NULL);
1977 
1978 
1979 	slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
1980 		   bond_is_active_slave(new_slave) ? "an active" : "a backup",
1981 		   new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1982 
1983 	/* enslave is successful */
1984 	bond_queue_slave_event(new_slave);
1985 	return 0;
1986 
1987 /* Undo stages on error */
1988 err_sysfs_del:
1989 	bond_sysfs_slave_del(new_slave);
1990 
1991 err_upper_unlink:
1992 	bond_upper_dev_unlink(bond, new_slave);
1993 
1994 err_unregister:
1995 	netdev_rx_handler_unregister(slave_dev);
1996 
1997 err_detach:
1998 	vlan_vids_del_by_dev(slave_dev, bond_dev);
1999 	if (rcu_access_pointer(bond->primary_slave) == new_slave)
2000 		RCU_INIT_POINTER(bond->primary_slave, NULL);
2001 	if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
2002 		block_netpoll_tx();
2003 		bond_change_active_slave(bond, NULL);
2004 		bond_select_active_slave(bond);
2005 		unblock_netpoll_tx();
2006 	}
2007 	/* either primary_slave or curr_active_slave might've changed */
2008 	synchronize_rcu();
2009 	slave_disable_netpoll(new_slave);
2010 
2011 err_close:
2012 	if (!netif_is_bond_master(slave_dev))
2013 		slave_dev->priv_flags &= ~IFF_BONDING;
2014 	dev_close(slave_dev);
2015 
2016 err_restore_mac:
2017 	slave_dev->flags &= ~IFF_SLAVE;
2018 	if (!bond->params.fail_over_mac ||
2019 	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2020 		/* XXX TODO - fom follow mode needs to change master's
2021 		 * MAC if this slave's MAC is in use by the bond, or at
2022 		 * least print a warning.
2023 		 */
2024 		bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
2025 				  new_slave->dev->addr_len);
2026 		ss.ss_family = slave_dev->type;
2027 		dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2028 	}
2029 
2030 err_restore_mtu:
2031 	dev_set_mtu(slave_dev, new_slave->original_mtu);
2032 
2033 err_free:
2034 	kobject_put(&new_slave->kobj);
2035 
2036 err_undo_flags:
2037 	/* Enslave of first slave has failed and we need to fix master's mac */
2038 	if (!bond_has_slaves(bond)) {
2039 		if (ether_addr_equal_64bits(bond_dev->dev_addr,
2040 					    slave_dev->dev_addr))
2041 			eth_hw_addr_random(bond_dev);
2042 		if (bond_dev->type != ARPHRD_ETHER) {
2043 			dev_close(bond_dev);
2044 			ether_setup(bond_dev);
2045 			bond_dev->flags |= IFF_MASTER;
2046 			bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2047 		}
2048 	}
2049 
2050 	return res;
2051 }
2052 
2053 /* Try to release the slave device <slave> from the bond device <master>
2054  * It is legal to access curr_active_slave without a lock because all the function
2055  * is RTNL-locked. If "all" is true it means that the function is being called
2056  * while destroying a bond interface and all slaves are being released.
2057  *
2058  * The rules for slave state should be:
2059  *   for Active/Backup:
2060  *     Active stays on all backups go down
2061  *   for Bonded connections:
2062  *     The first up interface should be left on and all others downed.
2063  */
2064 static int __bond_release_one(struct net_device *bond_dev,
2065 			      struct net_device *slave_dev,
2066 			      bool all, bool unregister)
2067 {
2068 	struct bonding *bond = netdev_priv(bond_dev);
2069 	struct slave *slave, *oldcurrent;
2070 	struct sockaddr_storage ss;
2071 	int old_flags = bond_dev->flags;
2072 	netdev_features_t old_features = bond_dev->features;
2073 
2074 	/* slave is not a slave or master is not master of this slave */
2075 	if (!(slave_dev->flags & IFF_SLAVE) ||
2076 	    !netdev_has_upper_dev(slave_dev, bond_dev)) {
2077 		slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
2078 		return -EINVAL;
2079 	}
2080 
2081 	block_netpoll_tx();
2082 
2083 	slave = bond_get_slave_by_dev(bond, slave_dev);
2084 	if (!slave) {
2085 		/* not a slave of this bond */
2086 		slave_info(bond_dev, slave_dev, "interface not enslaved\n");
2087 		unblock_netpoll_tx();
2088 		return -EINVAL;
2089 	}
2090 
2091 	bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
2092 
2093 	bond_sysfs_slave_del(slave);
2094 
2095 	/* recompute stats just before removing the slave */
2096 	bond_get_stats(bond->dev, &bond->bond_stats);
2097 
2098 	bond_upper_dev_unlink(bond, slave);
2099 	/* unregister rx_handler early so bond_handle_frame wouldn't be called
2100 	 * for this slave anymore.
2101 	 */
2102 	netdev_rx_handler_unregister(slave_dev);
2103 
2104 	if (BOND_MODE(bond) == BOND_MODE_8023AD)
2105 		bond_3ad_unbind_slave(slave);
2106 
2107 	if (bond_mode_can_use_xmit_hash(bond))
2108 		bond_update_slave_arr(bond, slave);
2109 
2110 	slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
2111 		    bond_is_active_slave(slave) ? "active" : "backup");
2112 
2113 	oldcurrent = rcu_access_pointer(bond->curr_active_slave);
2114 
2115 	RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2116 
2117 	if (!all && (!bond->params.fail_over_mac ||
2118 		     BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
2119 		if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
2120 		    bond_has_slaves(bond))
2121 			slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n",
2122 				   slave->perm_hwaddr);
2123 	}
2124 
2125 	if (rtnl_dereference(bond->primary_slave) == slave)
2126 		RCU_INIT_POINTER(bond->primary_slave, NULL);
2127 
2128 	if (oldcurrent == slave)
2129 		bond_change_active_slave(bond, NULL);
2130 
2131 	if (bond_is_lb(bond)) {
2132 		/* Must be called only after the slave has been
2133 		 * detached from the list and the curr_active_slave
2134 		 * has been cleared (if our_slave == old_current),
2135 		 * but before a new active slave is selected.
2136 		 */
2137 		bond_alb_deinit_slave(bond, slave);
2138 	}
2139 
2140 	if (all) {
2141 		RCU_INIT_POINTER(bond->curr_active_slave, NULL);
2142 	} else if (oldcurrent == slave) {
2143 		/* Note that we hold RTNL over this sequence, so there
2144 		 * is no concern that another slave add/remove event
2145 		 * will interfere.
2146 		 */
2147 		bond_select_active_slave(bond);
2148 	}
2149 
2150 	if (!bond_has_slaves(bond)) {
2151 		bond_set_carrier(bond);
2152 		eth_hw_addr_random(bond_dev);
2153 	}
2154 
2155 	unblock_netpoll_tx();
2156 	synchronize_rcu();
2157 	bond->slave_cnt--;
2158 
2159 	if (!bond_has_slaves(bond)) {
2160 		call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2161 		call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2162 	}
2163 
2164 	bond_compute_features(bond);
2165 	if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2166 	    (old_features & NETIF_F_VLAN_CHALLENGED))
2167 		slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2168 
2169 	vlan_vids_del_by_dev(slave_dev, bond_dev);
2170 
2171 	/* If the mode uses primary, then this case was handled above by
2172 	 * bond_change_active_slave(..., NULL)
2173 	 */
2174 	if (!bond_uses_primary(bond)) {
2175 		/* unset promiscuity level from slave
2176 		 * NOTE: The NETDEV_CHANGEADDR call above may change the value
2177 		 * of the IFF_PROMISC flag in the bond_dev, but we need the
2178 		 * value of that flag before that change, as that was the value
2179 		 * when this slave was attached, so we cache at the start of the
2180 		 * function and use it here. Same goes for ALLMULTI below
2181 		 */
2182 		if (old_flags & IFF_PROMISC)
2183 			dev_set_promiscuity(slave_dev, -1);
2184 
2185 		/* unset allmulti level from slave */
2186 		if (old_flags & IFF_ALLMULTI)
2187 			dev_set_allmulti(slave_dev, -1);
2188 
2189 		bond_hw_addr_flush(bond_dev, slave_dev);
2190 	}
2191 
2192 	slave_disable_netpoll(slave);
2193 
2194 	/* close slave before restoring its mac address */
2195 	dev_close(slave_dev);
2196 
2197 	if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2198 	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2199 		/* restore original ("permanent") mac address */
2200 		bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2201 				  slave->dev->addr_len);
2202 		ss.ss_family = slave_dev->type;
2203 		dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2204 	}
2205 
2206 	if (unregister)
2207 		__dev_set_mtu(slave_dev, slave->original_mtu);
2208 	else
2209 		dev_set_mtu(slave_dev, slave->original_mtu);
2210 
2211 	if (!netif_is_bond_master(slave_dev))
2212 		slave_dev->priv_flags &= ~IFF_BONDING;
2213 
2214 	kobject_put(&slave->kobj);
2215 
2216 	return 0;
2217 }
2218 
2219 /* A wrapper used because of ndo_del_link */
2220 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2221 {
2222 	return __bond_release_one(bond_dev, slave_dev, false, false);
2223 }
2224 
2225 /* First release a slave and then destroy the bond if no more slaves are left.
2226  * Must be under rtnl_lock when this function is called.
2227  */
2228 static int bond_release_and_destroy(struct net_device *bond_dev,
2229 				    struct net_device *slave_dev)
2230 {
2231 	struct bonding *bond = netdev_priv(bond_dev);
2232 	int ret;
2233 
2234 	ret = __bond_release_one(bond_dev, slave_dev, false, true);
2235 	if (ret == 0 && !bond_has_slaves(bond) &&
2236 	    bond_dev->reg_state != NETREG_UNREGISTERING) {
2237 		bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2238 		netdev_info(bond_dev, "Destroying bond\n");
2239 		bond_remove_proc_entry(bond);
2240 		unregister_netdevice(bond_dev);
2241 	}
2242 	return ret;
2243 }
2244 
2245 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2246 {
2247 	struct bonding *bond = netdev_priv(bond_dev);
2248 	bond_fill_ifbond(bond, info);
2249 }
2250 
2251 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2252 {
2253 	struct bonding *bond = netdev_priv(bond_dev);
2254 	struct list_head *iter;
2255 	int i = 0, res = -ENODEV;
2256 	struct slave *slave;
2257 
2258 	bond_for_each_slave(bond, slave, iter) {
2259 		if (i++ == (int)info->slave_id) {
2260 			res = 0;
2261 			bond_fill_ifslave(slave, info);
2262 			break;
2263 		}
2264 	}
2265 
2266 	return res;
2267 }
2268 
2269 /*-------------------------------- Monitoring -------------------------------*/
2270 
2271 /* called with rcu_read_lock() */
2272 static int bond_miimon_inspect(struct bonding *bond)
2273 {
2274 	int link_state, commit = 0;
2275 	struct list_head *iter;
2276 	struct slave *slave;
2277 	bool ignore_updelay;
2278 
2279 	ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2280 
2281 	bond_for_each_slave_rcu(bond, slave, iter) {
2282 		bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2283 
2284 		link_state = bond_check_dev_link(bond, slave->dev, 0);
2285 
2286 		switch (slave->link) {
2287 		case BOND_LINK_UP:
2288 			if (link_state)
2289 				continue;
2290 
2291 			bond_propose_link_state(slave, BOND_LINK_FAIL);
2292 			commit++;
2293 			slave->delay = bond->params.downdelay;
2294 			if (slave->delay) {
2295 				slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2296 					   (BOND_MODE(bond) ==
2297 					    BOND_MODE_ACTIVEBACKUP) ?
2298 					    (bond_is_active_slave(slave) ?
2299 					     "active " : "backup ") : "",
2300 					   bond->params.downdelay * bond->params.miimon);
2301 			}
2302 			fallthrough;
2303 		case BOND_LINK_FAIL:
2304 			if (link_state) {
2305 				/* recovered before downdelay expired */
2306 				bond_propose_link_state(slave, BOND_LINK_UP);
2307 				slave->last_link_up = jiffies;
2308 				slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2309 					   (bond->params.downdelay - slave->delay) *
2310 					   bond->params.miimon);
2311 				commit++;
2312 				continue;
2313 			}
2314 
2315 			if (slave->delay <= 0) {
2316 				bond_propose_link_state(slave, BOND_LINK_DOWN);
2317 				commit++;
2318 				continue;
2319 			}
2320 
2321 			slave->delay--;
2322 			break;
2323 
2324 		case BOND_LINK_DOWN:
2325 			if (!link_state)
2326 				continue;
2327 
2328 			bond_propose_link_state(slave, BOND_LINK_BACK);
2329 			commit++;
2330 			slave->delay = bond->params.updelay;
2331 
2332 			if (slave->delay) {
2333 				slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2334 					   ignore_updelay ? 0 :
2335 					   bond->params.updelay *
2336 					   bond->params.miimon);
2337 			}
2338 			fallthrough;
2339 		case BOND_LINK_BACK:
2340 			if (!link_state) {
2341 				bond_propose_link_state(slave, BOND_LINK_DOWN);
2342 				slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2343 					   (bond->params.updelay - slave->delay) *
2344 					   bond->params.miimon);
2345 				commit++;
2346 				continue;
2347 			}
2348 
2349 			if (ignore_updelay)
2350 				slave->delay = 0;
2351 
2352 			if (slave->delay <= 0) {
2353 				bond_propose_link_state(slave, BOND_LINK_UP);
2354 				commit++;
2355 				ignore_updelay = false;
2356 				continue;
2357 			}
2358 
2359 			slave->delay--;
2360 			break;
2361 		}
2362 	}
2363 
2364 	return commit;
2365 }
2366 
2367 static void bond_miimon_link_change(struct bonding *bond,
2368 				    struct slave *slave,
2369 				    char link)
2370 {
2371 	switch (BOND_MODE(bond)) {
2372 	case BOND_MODE_8023AD:
2373 		bond_3ad_handle_link_change(slave, link);
2374 		break;
2375 	case BOND_MODE_TLB:
2376 	case BOND_MODE_ALB:
2377 		bond_alb_handle_link_change(bond, slave, link);
2378 		break;
2379 	case BOND_MODE_XOR:
2380 		bond_update_slave_arr(bond, NULL);
2381 		break;
2382 	}
2383 }
2384 
2385 static void bond_miimon_commit(struct bonding *bond)
2386 {
2387 	struct list_head *iter;
2388 	struct slave *slave, *primary;
2389 
2390 	bond_for_each_slave(bond, slave, iter) {
2391 		switch (slave->link_new_state) {
2392 		case BOND_LINK_NOCHANGE:
2393 			/* For 802.3ad mode, check current slave speed and
2394 			 * duplex again in case its port was disabled after
2395 			 * invalid speed/duplex reporting but recovered before
2396 			 * link monitoring could make a decision on the actual
2397 			 * link status
2398 			 */
2399 			if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2400 			    slave->link == BOND_LINK_UP)
2401 				bond_3ad_adapter_speed_duplex_changed(slave);
2402 			continue;
2403 
2404 		case BOND_LINK_UP:
2405 			if (bond_update_speed_duplex(slave) &&
2406 			    bond_needs_speed_duplex(bond)) {
2407 				slave->link = BOND_LINK_DOWN;
2408 				if (net_ratelimit())
2409 					slave_warn(bond->dev, slave->dev,
2410 						   "failed to get link speed/duplex\n");
2411 				continue;
2412 			}
2413 			bond_set_slave_link_state(slave, BOND_LINK_UP,
2414 						  BOND_SLAVE_NOTIFY_NOW);
2415 			slave->last_link_up = jiffies;
2416 
2417 			primary = rtnl_dereference(bond->primary_slave);
2418 			if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2419 				/* prevent it from being the active one */
2420 				bond_set_backup_slave(slave);
2421 			} else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2422 				/* make it immediately active */
2423 				bond_set_active_slave(slave);
2424 			}
2425 
2426 			slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2427 				   slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2428 				   slave->duplex ? "full" : "half");
2429 
2430 			bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2431 
2432 			if (!bond->curr_active_slave || slave == primary)
2433 				goto do_failover;
2434 
2435 			continue;
2436 
2437 		case BOND_LINK_DOWN:
2438 			if (slave->link_failure_count < UINT_MAX)
2439 				slave->link_failure_count++;
2440 
2441 			bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2442 						  BOND_SLAVE_NOTIFY_NOW);
2443 
2444 			if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2445 			    BOND_MODE(bond) == BOND_MODE_8023AD)
2446 				bond_set_slave_inactive_flags(slave,
2447 							      BOND_SLAVE_NOTIFY_NOW);
2448 
2449 			slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2450 
2451 			bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2452 
2453 			if (slave == rcu_access_pointer(bond->curr_active_slave))
2454 				goto do_failover;
2455 
2456 			continue;
2457 
2458 		default:
2459 			slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2460 				  slave->link_new_state);
2461 			bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2462 
2463 			continue;
2464 		}
2465 
2466 do_failover:
2467 		block_netpoll_tx();
2468 		bond_select_active_slave(bond);
2469 		unblock_netpoll_tx();
2470 	}
2471 
2472 	bond_set_carrier(bond);
2473 }
2474 
2475 /* bond_mii_monitor
2476  *
2477  * Really a wrapper that splits the mii monitor into two phases: an
2478  * inspection, then (if inspection indicates something needs to be done)
2479  * an acquisition of appropriate locks followed by a commit phase to
2480  * implement whatever link state changes are indicated.
2481  */
2482 static void bond_mii_monitor(struct work_struct *work)
2483 {
2484 	struct bonding *bond = container_of(work, struct bonding,
2485 					    mii_work.work);
2486 	bool should_notify_peers = false;
2487 	bool commit;
2488 	unsigned long delay;
2489 	struct slave *slave;
2490 	struct list_head *iter;
2491 
2492 	delay = msecs_to_jiffies(bond->params.miimon);
2493 
2494 	if (!bond_has_slaves(bond))
2495 		goto re_arm;
2496 
2497 	rcu_read_lock();
2498 	should_notify_peers = bond_should_notify_peers(bond);
2499 	commit = !!bond_miimon_inspect(bond);
2500 	if (bond->send_peer_notif) {
2501 		rcu_read_unlock();
2502 		if (rtnl_trylock()) {
2503 			bond->send_peer_notif--;
2504 			rtnl_unlock();
2505 		}
2506 	} else {
2507 		rcu_read_unlock();
2508 	}
2509 
2510 	if (commit) {
2511 		/* Race avoidance with bond_close cancel of workqueue */
2512 		if (!rtnl_trylock()) {
2513 			delay = 1;
2514 			should_notify_peers = false;
2515 			goto re_arm;
2516 		}
2517 
2518 		bond_for_each_slave(bond, slave, iter) {
2519 			bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2520 		}
2521 		bond_miimon_commit(bond);
2522 
2523 		rtnl_unlock();	/* might sleep, hold no other locks */
2524 	}
2525 
2526 re_arm:
2527 	if (bond->params.miimon)
2528 		queue_delayed_work(bond->wq, &bond->mii_work, delay);
2529 
2530 	if (should_notify_peers) {
2531 		if (!rtnl_trylock())
2532 			return;
2533 		call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2534 		rtnl_unlock();
2535 	}
2536 }
2537 
2538 static int bond_upper_dev_walk(struct net_device *upper,
2539 			       struct netdev_nested_priv *priv)
2540 {
2541 	__be32 ip = *(__be32 *)priv->data;
2542 
2543 	return ip == bond_confirm_addr(upper, 0, ip);
2544 }
2545 
2546 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2547 {
2548 	struct netdev_nested_priv priv = {
2549 		.data = (void *)&ip,
2550 	};
2551 	bool ret = false;
2552 
2553 	if (ip == bond_confirm_addr(bond->dev, 0, ip))
2554 		return true;
2555 
2556 	rcu_read_lock();
2557 	if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv))
2558 		ret = true;
2559 	rcu_read_unlock();
2560 
2561 	return ret;
2562 }
2563 
2564 /* We go to the (large) trouble of VLAN tagging ARP frames because
2565  * switches in VLAN mode (especially if ports are configured as
2566  * "native" to a VLAN) might not pass non-tagged frames.
2567  */
2568 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2569 			  __be32 src_ip, struct bond_vlan_tag *tags)
2570 {
2571 	struct sk_buff *skb;
2572 	struct bond_vlan_tag *outer_tag = tags;
2573 	struct net_device *slave_dev = slave->dev;
2574 	struct net_device *bond_dev = slave->bond->dev;
2575 
2576 	slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2577 		  arp_op, &dest_ip, &src_ip);
2578 
2579 	skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2580 			 NULL, slave_dev->dev_addr, NULL);
2581 
2582 	if (!skb) {
2583 		net_err_ratelimited("ARP packet allocation failed\n");
2584 		return;
2585 	}
2586 
2587 	if (!tags || tags->vlan_proto == VLAN_N_VID)
2588 		goto xmit;
2589 
2590 	tags++;
2591 
2592 	/* Go through all the tags backwards and add them to the packet */
2593 	while (tags->vlan_proto != VLAN_N_VID) {
2594 		if (!tags->vlan_id) {
2595 			tags++;
2596 			continue;
2597 		}
2598 
2599 		slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2600 			  ntohs(outer_tag->vlan_proto), tags->vlan_id);
2601 		skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2602 						tags->vlan_id);
2603 		if (!skb) {
2604 			net_err_ratelimited("failed to insert inner VLAN tag\n");
2605 			return;
2606 		}
2607 
2608 		tags++;
2609 	}
2610 	/* Set the outer tag */
2611 	if (outer_tag->vlan_id) {
2612 		slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2613 			  ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2614 		__vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2615 				       outer_tag->vlan_id);
2616 	}
2617 
2618 xmit:
2619 	arp_xmit(skb);
2620 }
2621 
2622 /* Validate the device path between the @start_dev and the @end_dev.
2623  * The path is valid if the @end_dev is reachable through device
2624  * stacking.
2625  * When the path is validated, collect any vlan information in the
2626  * path.
2627  */
2628 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2629 					      struct net_device *end_dev,
2630 					      int level)
2631 {
2632 	struct bond_vlan_tag *tags;
2633 	struct net_device *upper;
2634 	struct list_head  *iter;
2635 
2636 	if (start_dev == end_dev) {
2637 		tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2638 		if (!tags)
2639 			return ERR_PTR(-ENOMEM);
2640 		tags[level].vlan_proto = VLAN_N_VID;
2641 		return tags;
2642 	}
2643 
2644 	netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2645 		tags = bond_verify_device_path(upper, end_dev, level + 1);
2646 		if (IS_ERR_OR_NULL(tags)) {
2647 			if (IS_ERR(tags))
2648 				return tags;
2649 			continue;
2650 		}
2651 		if (is_vlan_dev(upper)) {
2652 			tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2653 			tags[level].vlan_id = vlan_dev_vlan_id(upper);
2654 		}
2655 
2656 		return tags;
2657 	}
2658 
2659 	return NULL;
2660 }
2661 
2662 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2663 {
2664 	struct rtable *rt;
2665 	struct bond_vlan_tag *tags;
2666 	__be32 *targets = bond->params.arp_targets, addr;
2667 	int i;
2668 
2669 	for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2670 		slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2671 			  __func__, &targets[i]);
2672 		tags = NULL;
2673 
2674 		/* Find out through which dev should the packet go */
2675 		rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2676 				     RTO_ONLINK, 0);
2677 		if (IS_ERR(rt)) {
2678 			/* there's no route to target - try to send arp
2679 			 * probe to generate any traffic (arp_validate=0)
2680 			 */
2681 			if (bond->params.arp_validate)
2682 				net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2683 						     bond->dev->name,
2684 						     &targets[i]);
2685 			bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2686 				      0, tags);
2687 			continue;
2688 		}
2689 
2690 		/* bond device itself */
2691 		if (rt->dst.dev == bond->dev)
2692 			goto found;
2693 
2694 		rcu_read_lock();
2695 		tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2696 		rcu_read_unlock();
2697 
2698 		if (!IS_ERR_OR_NULL(tags))
2699 			goto found;
2700 
2701 		/* Not our device - skip */
2702 		slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2703 			   &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2704 
2705 		ip_rt_put(rt);
2706 		continue;
2707 
2708 found:
2709 		addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2710 		ip_rt_put(rt);
2711 		bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2712 		kfree(tags);
2713 	}
2714 }
2715 
2716 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2717 {
2718 	int i;
2719 
2720 	if (!sip || !bond_has_this_ip(bond, tip)) {
2721 		slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2722 			   __func__, &sip, &tip);
2723 		return;
2724 	}
2725 
2726 	i = bond_get_targets_ip(bond->params.arp_targets, sip);
2727 	if (i == -1) {
2728 		slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
2729 			   __func__, &sip);
2730 		return;
2731 	}
2732 	slave->last_rx = jiffies;
2733 	slave->target_last_arp_rx[i] = jiffies;
2734 }
2735 
2736 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2737 		 struct slave *slave)
2738 {
2739 	struct arphdr *arp = (struct arphdr *)skb->data;
2740 	struct slave *curr_active_slave, *curr_arp_slave;
2741 	unsigned char *arp_ptr;
2742 	__be32 sip, tip;
2743 	int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2744 	unsigned int alen;
2745 
2746 	if (!slave_do_arp_validate(bond, slave)) {
2747 		if ((slave_do_arp_validate_only(bond) && is_arp) ||
2748 		    !slave_do_arp_validate_only(bond))
2749 			slave->last_rx = jiffies;
2750 		return RX_HANDLER_ANOTHER;
2751 	} else if (!is_arp) {
2752 		return RX_HANDLER_ANOTHER;
2753 	}
2754 
2755 	alen = arp_hdr_len(bond->dev);
2756 
2757 	slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
2758 		   __func__, skb->dev->name);
2759 
2760 	if (alen > skb_headlen(skb)) {
2761 		arp = kmalloc(alen, GFP_ATOMIC);
2762 		if (!arp)
2763 			goto out_unlock;
2764 		if (skb_copy_bits(skb, 0, arp, alen) < 0)
2765 			goto out_unlock;
2766 	}
2767 
2768 	if (arp->ar_hln != bond->dev->addr_len ||
2769 	    skb->pkt_type == PACKET_OTHERHOST ||
2770 	    skb->pkt_type == PACKET_LOOPBACK ||
2771 	    arp->ar_hrd != htons(ARPHRD_ETHER) ||
2772 	    arp->ar_pro != htons(ETH_P_IP) ||
2773 	    arp->ar_pln != 4)
2774 		goto out_unlock;
2775 
2776 	arp_ptr = (unsigned char *)(arp + 1);
2777 	arp_ptr += bond->dev->addr_len;
2778 	memcpy(&sip, arp_ptr, 4);
2779 	arp_ptr += 4 + bond->dev->addr_len;
2780 	memcpy(&tip, arp_ptr, 4);
2781 
2782 	slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2783 		  __func__, slave->dev->name, bond_slave_state(slave),
2784 		  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2785 		  &sip, &tip);
2786 
2787 	curr_active_slave = rcu_dereference(bond->curr_active_slave);
2788 	curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2789 
2790 	/* We 'trust' the received ARP enough to validate it if:
2791 	 *
2792 	 * (a) the slave receiving the ARP is active (which includes the
2793 	 * current ARP slave, if any), or
2794 	 *
2795 	 * (b) the receiving slave isn't active, but there is a currently
2796 	 * active slave and it received valid arp reply(s) after it became
2797 	 * the currently active slave, or
2798 	 *
2799 	 * (c) there is an ARP slave that sent an ARP during the prior ARP
2800 	 * interval, and we receive an ARP reply on any slave.  We accept
2801 	 * these because switch FDB update delays may deliver the ARP
2802 	 * reply to a slave other than the sender of the ARP request.
2803 	 *
2804 	 * Note: for (b), backup slaves are receiving the broadcast ARP
2805 	 * request, not a reply.  This request passes from the sending
2806 	 * slave through the L2 switch(es) to the receiving slave.  Since
2807 	 * this is checking the request, sip/tip are swapped for
2808 	 * validation.
2809 	 *
2810 	 * This is done to avoid endless looping when we can't reach the
2811 	 * arp_ip_target and fool ourselves with our own arp requests.
2812 	 */
2813 	if (bond_is_active_slave(slave))
2814 		bond_validate_arp(bond, slave, sip, tip);
2815 	else if (curr_active_slave &&
2816 		 time_after(slave_last_rx(bond, curr_active_slave),
2817 			    curr_active_slave->last_link_up))
2818 		bond_validate_arp(bond, slave, tip, sip);
2819 	else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2820 		 bond_time_in_interval(bond,
2821 				       dev_trans_start(curr_arp_slave->dev), 1))
2822 		bond_validate_arp(bond, slave, sip, tip);
2823 
2824 out_unlock:
2825 	if (arp != (struct arphdr *)skb->data)
2826 		kfree(arp);
2827 	return RX_HANDLER_ANOTHER;
2828 }
2829 
2830 /* function to verify if we're in the arp_interval timeslice, returns true if
2831  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2832  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2833  */
2834 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2835 				  int mod)
2836 {
2837 	int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2838 
2839 	return time_in_range(jiffies,
2840 			     last_act - delta_in_ticks,
2841 			     last_act + mod * delta_in_ticks + delta_in_ticks/2);
2842 }
2843 
2844 /* This function is called regularly to monitor each slave's link
2845  * ensuring that traffic is being sent and received when arp monitoring
2846  * is used in load-balancing mode. if the adapter has been dormant, then an
2847  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2848  * arp monitoring in active backup mode.
2849  */
2850 static void bond_loadbalance_arp_mon(struct bonding *bond)
2851 {
2852 	struct slave *slave, *oldcurrent;
2853 	struct list_head *iter;
2854 	int do_failover = 0, slave_state_changed = 0;
2855 
2856 	if (!bond_has_slaves(bond))
2857 		goto re_arm;
2858 
2859 	rcu_read_lock();
2860 
2861 	oldcurrent = rcu_dereference(bond->curr_active_slave);
2862 	/* see if any of the previous devices are up now (i.e. they have
2863 	 * xmt and rcv traffic). the curr_active_slave does not come into
2864 	 * the picture unless it is null. also, slave->last_link_up is not
2865 	 * needed here because we send an arp on each slave and give a slave
2866 	 * as long as it needs to get the tx/rx within the delta.
2867 	 * TODO: what about up/down delay in arp mode? it wasn't here before
2868 	 *       so it can wait
2869 	 */
2870 	bond_for_each_slave_rcu(bond, slave, iter) {
2871 		unsigned long trans_start = dev_trans_start(slave->dev);
2872 
2873 		bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2874 
2875 		if (slave->link != BOND_LINK_UP) {
2876 			if (bond_time_in_interval(bond, trans_start, 1) &&
2877 			    bond_time_in_interval(bond, slave->last_rx, 1)) {
2878 
2879 				bond_propose_link_state(slave, BOND_LINK_UP);
2880 				slave_state_changed = 1;
2881 
2882 				/* primary_slave has no meaning in round-robin
2883 				 * mode. the window of a slave being up and
2884 				 * curr_active_slave being null after enslaving
2885 				 * is closed.
2886 				 */
2887 				if (!oldcurrent) {
2888 					slave_info(bond->dev, slave->dev, "link status definitely up\n");
2889 					do_failover = 1;
2890 				} else {
2891 					slave_info(bond->dev, slave->dev, "interface is now up\n");
2892 				}
2893 			}
2894 		} else {
2895 			/* slave->link == BOND_LINK_UP */
2896 
2897 			/* not all switches will respond to an arp request
2898 			 * when the source ip is 0, so don't take the link down
2899 			 * if we don't know our ip yet
2900 			 */
2901 			if (!bond_time_in_interval(bond, trans_start, 2) ||
2902 			    !bond_time_in_interval(bond, slave->last_rx, 2)) {
2903 
2904 				bond_propose_link_state(slave, BOND_LINK_DOWN);
2905 				slave_state_changed = 1;
2906 
2907 				if (slave->link_failure_count < UINT_MAX)
2908 					slave->link_failure_count++;
2909 
2910 				slave_info(bond->dev, slave->dev, "interface is now down\n");
2911 
2912 				if (slave == oldcurrent)
2913 					do_failover = 1;
2914 			}
2915 		}
2916 
2917 		/* note: if switch is in round-robin mode, all links
2918 		 * must tx arp to ensure all links rx an arp - otherwise
2919 		 * links may oscillate or not come up at all; if switch is
2920 		 * in something like xor mode, there is nothing we can
2921 		 * do - all replies will be rx'ed on same link causing slaves
2922 		 * to be unstable during low/no traffic periods
2923 		 */
2924 		if (bond_slave_is_up(slave))
2925 			bond_arp_send_all(bond, slave);
2926 	}
2927 
2928 	rcu_read_unlock();
2929 
2930 	if (do_failover || slave_state_changed) {
2931 		if (!rtnl_trylock())
2932 			goto re_arm;
2933 
2934 		bond_for_each_slave(bond, slave, iter) {
2935 			if (slave->link_new_state != BOND_LINK_NOCHANGE)
2936 				slave->link = slave->link_new_state;
2937 		}
2938 
2939 		if (slave_state_changed) {
2940 			bond_slave_state_change(bond);
2941 			if (BOND_MODE(bond) == BOND_MODE_XOR)
2942 				bond_update_slave_arr(bond, NULL);
2943 		}
2944 		if (do_failover) {
2945 			block_netpoll_tx();
2946 			bond_select_active_slave(bond);
2947 			unblock_netpoll_tx();
2948 		}
2949 		rtnl_unlock();
2950 	}
2951 
2952 re_arm:
2953 	if (bond->params.arp_interval)
2954 		queue_delayed_work(bond->wq, &bond->arp_work,
2955 				   msecs_to_jiffies(bond->params.arp_interval));
2956 }
2957 
2958 /* Called to inspect slaves for active-backup mode ARP monitor link state
2959  * changes.  Sets proposed link state in slaves to specify what action
2960  * should take place for the slave.  Returns 0 if no changes are found, >0
2961  * if changes to link states must be committed.
2962  *
2963  * Called with rcu_read_lock held.
2964  */
2965 static int bond_ab_arp_inspect(struct bonding *bond)
2966 {
2967 	unsigned long trans_start, last_rx;
2968 	struct list_head *iter;
2969 	struct slave *slave;
2970 	int commit = 0;
2971 
2972 	bond_for_each_slave_rcu(bond, slave, iter) {
2973 		bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2974 		last_rx = slave_last_rx(bond, slave);
2975 
2976 		if (slave->link != BOND_LINK_UP) {
2977 			if (bond_time_in_interval(bond, last_rx, 1)) {
2978 				bond_propose_link_state(slave, BOND_LINK_UP);
2979 				commit++;
2980 			} else if (slave->link == BOND_LINK_BACK) {
2981 				bond_propose_link_state(slave, BOND_LINK_FAIL);
2982 				commit++;
2983 			}
2984 			continue;
2985 		}
2986 
2987 		/* Give slaves 2*delta after being enslaved or made
2988 		 * active.  This avoids bouncing, as the last receive
2989 		 * times need a full ARP monitor cycle to be updated.
2990 		 */
2991 		if (bond_time_in_interval(bond, slave->last_link_up, 2))
2992 			continue;
2993 
2994 		/* Backup slave is down if:
2995 		 * - No current_arp_slave AND
2996 		 * - more than 3*delta since last receive AND
2997 		 * - the bond has an IP address
2998 		 *
2999 		 * Note: a non-null current_arp_slave indicates
3000 		 * the curr_active_slave went down and we are
3001 		 * searching for a new one; under this condition
3002 		 * we only take the curr_active_slave down - this
3003 		 * gives each slave a chance to tx/rx traffic
3004 		 * before being taken out
3005 		 */
3006 		if (!bond_is_active_slave(slave) &&
3007 		    !rcu_access_pointer(bond->current_arp_slave) &&
3008 		    !bond_time_in_interval(bond, last_rx, 3)) {
3009 			bond_propose_link_state(slave, BOND_LINK_DOWN);
3010 			commit++;
3011 		}
3012 
3013 		/* Active slave is down if:
3014 		 * - more than 2*delta since transmitting OR
3015 		 * - (more than 2*delta since receive AND
3016 		 *    the bond has an IP address)
3017 		 */
3018 		trans_start = dev_trans_start(slave->dev);
3019 		if (bond_is_active_slave(slave) &&
3020 		    (!bond_time_in_interval(bond, trans_start, 2) ||
3021 		     !bond_time_in_interval(bond, last_rx, 2))) {
3022 			bond_propose_link_state(slave, BOND_LINK_DOWN);
3023 			commit++;
3024 		}
3025 	}
3026 
3027 	return commit;
3028 }
3029 
3030 /* Called to commit link state changes noted by inspection step of
3031  * active-backup mode ARP monitor.
3032  *
3033  * Called with RTNL hold.
3034  */
3035 static void bond_ab_arp_commit(struct bonding *bond)
3036 {
3037 	unsigned long trans_start;
3038 	struct list_head *iter;
3039 	struct slave *slave;
3040 
3041 	bond_for_each_slave(bond, slave, iter) {
3042 		switch (slave->link_new_state) {
3043 		case BOND_LINK_NOCHANGE:
3044 			continue;
3045 
3046 		case BOND_LINK_UP:
3047 			trans_start = dev_trans_start(slave->dev);
3048 			if (rtnl_dereference(bond->curr_active_slave) != slave ||
3049 			    (!rtnl_dereference(bond->curr_active_slave) &&
3050 			     bond_time_in_interval(bond, trans_start, 1))) {
3051 				struct slave *current_arp_slave;
3052 
3053 				current_arp_slave = rtnl_dereference(bond->current_arp_slave);
3054 				bond_set_slave_link_state(slave, BOND_LINK_UP,
3055 							  BOND_SLAVE_NOTIFY_NOW);
3056 				if (current_arp_slave) {
3057 					bond_set_slave_inactive_flags(
3058 						current_arp_slave,
3059 						BOND_SLAVE_NOTIFY_NOW);
3060 					RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3061 				}
3062 
3063 				slave_info(bond->dev, slave->dev, "link status definitely up\n");
3064 
3065 				if (!rtnl_dereference(bond->curr_active_slave) ||
3066 				    slave == rtnl_dereference(bond->primary_slave))
3067 					goto do_failover;
3068 
3069 			}
3070 
3071 			continue;
3072 
3073 		case BOND_LINK_DOWN:
3074 			if (slave->link_failure_count < UINT_MAX)
3075 				slave->link_failure_count++;
3076 
3077 			bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3078 						  BOND_SLAVE_NOTIFY_NOW);
3079 			bond_set_slave_inactive_flags(slave,
3080 						      BOND_SLAVE_NOTIFY_NOW);
3081 
3082 			slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
3083 
3084 			if (slave == rtnl_dereference(bond->curr_active_slave)) {
3085 				RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3086 				goto do_failover;
3087 			}
3088 
3089 			continue;
3090 
3091 		case BOND_LINK_FAIL:
3092 			bond_set_slave_link_state(slave, BOND_LINK_FAIL,
3093 						  BOND_SLAVE_NOTIFY_NOW);
3094 			bond_set_slave_inactive_flags(slave,
3095 						      BOND_SLAVE_NOTIFY_NOW);
3096 
3097 			/* A slave has just been enslaved and has become
3098 			 * the current active slave.
3099 			 */
3100 			if (rtnl_dereference(bond->curr_active_slave))
3101 				RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3102 			continue;
3103 
3104 		default:
3105 			slave_err(bond->dev, slave->dev,
3106 				  "impossible: link_new_state %d on slave\n",
3107 				  slave->link_new_state);
3108 			continue;
3109 		}
3110 
3111 do_failover:
3112 		block_netpoll_tx();
3113 		bond_select_active_slave(bond);
3114 		unblock_netpoll_tx();
3115 	}
3116 
3117 	bond_set_carrier(bond);
3118 }
3119 
3120 /* Send ARP probes for active-backup mode ARP monitor.
3121  *
3122  * Called with rcu_read_lock held.
3123  */
3124 static bool bond_ab_arp_probe(struct bonding *bond)
3125 {
3126 	struct slave *slave, *before = NULL, *new_slave = NULL,
3127 		     *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
3128 		     *curr_active_slave = rcu_dereference(bond->curr_active_slave);
3129 	struct list_head *iter;
3130 	bool found = false;
3131 	bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
3132 
3133 	if (curr_arp_slave && curr_active_slave)
3134 		netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
3135 			    curr_arp_slave->dev->name,
3136 			    curr_active_slave->dev->name);
3137 
3138 	if (curr_active_slave) {
3139 		bond_arp_send_all(bond, curr_active_slave);
3140 		return should_notify_rtnl;
3141 	}
3142 
3143 	/* if we don't have a curr_active_slave, search for the next available
3144 	 * backup slave from the current_arp_slave and make it the candidate
3145 	 * for becoming the curr_active_slave
3146 	 */
3147 
3148 	if (!curr_arp_slave) {
3149 		curr_arp_slave = bond_first_slave_rcu(bond);
3150 		if (!curr_arp_slave)
3151 			return should_notify_rtnl;
3152 	}
3153 
3154 	bond_for_each_slave_rcu(bond, slave, iter) {
3155 		if (!found && !before && bond_slave_is_up(slave))
3156 			before = slave;
3157 
3158 		if (found && !new_slave && bond_slave_is_up(slave))
3159 			new_slave = slave;
3160 		/* if the link state is up at this point, we
3161 		 * mark it down - this can happen if we have
3162 		 * simultaneous link failures and
3163 		 * reselect_active_interface doesn't make this
3164 		 * one the current slave so it is still marked
3165 		 * up when it is actually down
3166 		 */
3167 		if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3168 			bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3169 						  BOND_SLAVE_NOTIFY_LATER);
3170 			if (slave->link_failure_count < UINT_MAX)
3171 				slave->link_failure_count++;
3172 
3173 			bond_set_slave_inactive_flags(slave,
3174 						      BOND_SLAVE_NOTIFY_LATER);
3175 
3176 			slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3177 		}
3178 		if (slave == curr_arp_slave)
3179 			found = true;
3180 	}
3181 
3182 	if (!new_slave && before)
3183 		new_slave = before;
3184 
3185 	if (!new_slave)
3186 		goto check_state;
3187 
3188 	bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3189 				  BOND_SLAVE_NOTIFY_LATER);
3190 	bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3191 	bond_arp_send_all(bond, new_slave);
3192 	new_slave->last_link_up = jiffies;
3193 	rcu_assign_pointer(bond->current_arp_slave, new_slave);
3194 
3195 check_state:
3196 	bond_for_each_slave_rcu(bond, slave, iter) {
3197 		if (slave->should_notify || slave->should_notify_link) {
3198 			should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3199 			break;
3200 		}
3201 	}
3202 	return should_notify_rtnl;
3203 }
3204 
3205 static void bond_activebackup_arp_mon(struct bonding *bond)
3206 {
3207 	bool should_notify_peers = false;
3208 	bool should_notify_rtnl = false;
3209 	int delta_in_ticks;
3210 
3211 	delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3212 
3213 	if (!bond_has_slaves(bond))
3214 		goto re_arm;
3215 
3216 	rcu_read_lock();
3217 
3218 	should_notify_peers = bond_should_notify_peers(bond);
3219 
3220 	if (bond_ab_arp_inspect(bond)) {
3221 		rcu_read_unlock();
3222 
3223 		/* Race avoidance with bond_close flush of workqueue */
3224 		if (!rtnl_trylock()) {
3225 			delta_in_ticks = 1;
3226 			should_notify_peers = false;
3227 			goto re_arm;
3228 		}
3229 
3230 		bond_ab_arp_commit(bond);
3231 
3232 		rtnl_unlock();
3233 		rcu_read_lock();
3234 	}
3235 
3236 	should_notify_rtnl = bond_ab_arp_probe(bond);
3237 	rcu_read_unlock();
3238 
3239 re_arm:
3240 	if (bond->params.arp_interval)
3241 		queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3242 
3243 	if (should_notify_peers || should_notify_rtnl) {
3244 		if (!rtnl_trylock())
3245 			return;
3246 
3247 		if (should_notify_peers)
3248 			call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3249 						 bond->dev);
3250 		if (should_notify_rtnl) {
3251 			bond_slave_state_notify(bond);
3252 			bond_slave_link_notify(bond);
3253 		}
3254 
3255 		rtnl_unlock();
3256 	}
3257 }
3258 
3259 static void bond_arp_monitor(struct work_struct *work)
3260 {
3261 	struct bonding *bond = container_of(work, struct bonding,
3262 					    arp_work.work);
3263 
3264 	if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3265 		bond_activebackup_arp_mon(bond);
3266 	else
3267 		bond_loadbalance_arp_mon(bond);
3268 }
3269 
3270 /*-------------------------- netdev event handling --------------------------*/
3271 
3272 /* Change device name */
3273 static int bond_event_changename(struct bonding *bond)
3274 {
3275 	bond_remove_proc_entry(bond);
3276 	bond_create_proc_entry(bond);
3277 
3278 	bond_debug_reregister(bond);
3279 
3280 	return NOTIFY_DONE;
3281 }
3282 
3283 static int bond_master_netdev_event(unsigned long event,
3284 				    struct net_device *bond_dev)
3285 {
3286 	struct bonding *event_bond = netdev_priv(bond_dev);
3287 
3288 	netdev_dbg(bond_dev, "%s called\n", __func__);
3289 
3290 	switch (event) {
3291 	case NETDEV_CHANGENAME:
3292 		return bond_event_changename(event_bond);
3293 	case NETDEV_UNREGISTER:
3294 		bond_remove_proc_entry(event_bond);
3295 		break;
3296 	case NETDEV_REGISTER:
3297 		bond_create_proc_entry(event_bond);
3298 		break;
3299 	default:
3300 		break;
3301 	}
3302 
3303 	return NOTIFY_DONE;
3304 }
3305 
3306 static int bond_slave_netdev_event(unsigned long event,
3307 				   struct net_device *slave_dev)
3308 {
3309 	struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3310 	struct bonding *bond;
3311 	struct net_device *bond_dev;
3312 
3313 	/* A netdev event can be generated while enslaving a device
3314 	 * before netdev_rx_handler_register is called in which case
3315 	 * slave will be NULL
3316 	 */
3317 	if (!slave) {
3318 		netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3319 		return NOTIFY_DONE;
3320 	}
3321 
3322 	bond_dev = slave->bond->dev;
3323 	bond = slave->bond;
3324 	primary = rtnl_dereference(bond->primary_slave);
3325 
3326 	slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3327 
3328 	switch (event) {
3329 	case NETDEV_UNREGISTER:
3330 		if (bond_dev->type != ARPHRD_ETHER)
3331 			bond_release_and_destroy(bond_dev, slave_dev);
3332 		else
3333 			__bond_release_one(bond_dev, slave_dev, false, true);
3334 		break;
3335 	case NETDEV_UP:
3336 	case NETDEV_CHANGE:
3337 		/* For 802.3ad mode only:
3338 		 * Getting invalid Speed/Duplex values here will put slave
3339 		 * in weird state. Mark it as link-fail if the link was
3340 		 * previously up or link-down if it hasn't yet come up, and
3341 		 * let link-monitoring (miimon) set it right when correct
3342 		 * speeds/duplex are available.
3343 		 */
3344 		if (bond_update_speed_duplex(slave) &&
3345 		    BOND_MODE(bond) == BOND_MODE_8023AD) {
3346 			if (slave->last_link_up)
3347 				slave->link = BOND_LINK_FAIL;
3348 			else
3349 				slave->link = BOND_LINK_DOWN;
3350 		}
3351 
3352 		if (BOND_MODE(bond) == BOND_MODE_8023AD)
3353 			bond_3ad_adapter_speed_duplex_changed(slave);
3354 		fallthrough;
3355 	case NETDEV_DOWN:
3356 		/* Refresh slave-array if applicable!
3357 		 * If the setup does not use miimon or arpmon (mode-specific!),
3358 		 * then these events will not cause the slave-array to be
3359 		 * refreshed. This will cause xmit to use a slave that is not
3360 		 * usable. Avoid such situation by refeshing the array at these
3361 		 * events. If these (miimon/arpmon) parameters are configured
3362 		 * then array gets refreshed twice and that should be fine!
3363 		 */
3364 		if (bond_mode_can_use_xmit_hash(bond))
3365 			bond_update_slave_arr(bond, NULL);
3366 		break;
3367 	case NETDEV_CHANGEMTU:
3368 		/* TODO: Should slaves be allowed to
3369 		 * independently alter their MTU?  For
3370 		 * an active-backup bond, slaves need
3371 		 * not be the same type of device, so
3372 		 * MTUs may vary.  For other modes,
3373 		 * slaves arguably should have the
3374 		 * same MTUs. To do this, we'd need to
3375 		 * take over the slave's change_mtu
3376 		 * function for the duration of their
3377 		 * servitude.
3378 		 */
3379 		break;
3380 	case NETDEV_CHANGENAME:
3381 		/* we don't care if we don't have primary set */
3382 		if (!bond_uses_primary(bond) ||
3383 		    !bond->params.primary[0])
3384 			break;
3385 
3386 		if (slave == primary) {
3387 			/* slave's name changed - he's no longer primary */
3388 			RCU_INIT_POINTER(bond->primary_slave, NULL);
3389 		} else if (!strcmp(slave_dev->name, bond->params.primary)) {
3390 			/* we have a new primary slave */
3391 			rcu_assign_pointer(bond->primary_slave, slave);
3392 		} else { /* we didn't change primary - exit */
3393 			break;
3394 		}
3395 
3396 		netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3397 			    primary ? slave_dev->name : "none");
3398 
3399 		block_netpoll_tx();
3400 		bond_select_active_slave(bond);
3401 		unblock_netpoll_tx();
3402 		break;
3403 	case NETDEV_FEAT_CHANGE:
3404 		bond_compute_features(bond);
3405 		break;
3406 	case NETDEV_RESEND_IGMP:
3407 		/* Propagate to master device */
3408 		call_netdevice_notifiers(event, slave->bond->dev);
3409 		break;
3410 	default:
3411 		break;
3412 	}
3413 
3414 	return NOTIFY_DONE;
3415 }
3416 
3417 /* bond_netdev_event: handle netdev notifier chain events.
3418  *
3419  * This function receives events for the netdev chain.  The caller (an
3420  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3421  * locks for us to safely manipulate the slave devices (RTNL lock,
3422  * dev_probe_lock).
3423  */
3424 static int bond_netdev_event(struct notifier_block *this,
3425 			     unsigned long event, void *ptr)
3426 {
3427 	struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3428 
3429 	netdev_dbg(event_dev, "%s received %s\n",
3430 		   __func__, netdev_cmd_to_name(event));
3431 
3432 	if (!(event_dev->priv_flags & IFF_BONDING))
3433 		return NOTIFY_DONE;
3434 
3435 	if (event_dev->flags & IFF_MASTER) {
3436 		int ret;
3437 
3438 		ret = bond_master_netdev_event(event, event_dev);
3439 		if (ret != NOTIFY_DONE)
3440 			return ret;
3441 	}
3442 
3443 	if (event_dev->flags & IFF_SLAVE)
3444 		return bond_slave_netdev_event(event, event_dev);
3445 
3446 	return NOTIFY_DONE;
3447 }
3448 
3449 static struct notifier_block bond_netdev_notifier = {
3450 	.notifier_call = bond_netdev_event,
3451 };
3452 
3453 /*---------------------------- Hashing Policies -----------------------------*/
3454 
3455 /* L2 hash helper */
3456 static inline u32 bond_eth_hash(struct sk_buff *skb)
3457 {
3458 	struct ethhdr *ep, hdr_tmp;
3459 
3460 	ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3461 	if (ep)
3462 		return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3463 	return 0;
3464 }
3465 
3466 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk,
3467 			 int *noff, int *proto, bool l34)
3468 {
3469 	const struct ipv6hdr *iph6;
3470 	const struct iphdr *iph;
3471 
3472 	if (skb->protocol == htons(ETH_P_IP)) {
3473 		if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph))))
3474 			return false;
3475 		iph = (const struct iphdr *)(skb->data + *noff);
3476 		iph_to_flow_copy_v4addrs(fk, iph);
3477 		*noff += iph->ihl << 2;
3478 		if (!ip_is_fragment(iph))
3479 			*proto = iph->protocol;
3480 	} else if (skb->protocol == htons(ETH_P_IPV6)) {
3481 		if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph6))))
3482 			return false;
3483 		iph6 = (const struct ipv6hdr *)(skb->data + *noff);
3484 		iph_to_flow_copy_v6addrs(fk, iph6);
3485 		*noff += sizeof(*iph6);
3486 		*proto = iph6->nexthdr;
3487 	} else {
3488 		return false;
3489 	}
3490 
3491 	if (l34 && *proto >= 0)
3492 		fk->ports.ports = skb_flow_get_ports(skb, *noff, *proto);
3493 
3494 	return true;
3495 }
3496 
3497 /* Extract the appropriate headers based on bond's xmit policy */
3498 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3499 			      struct flow_keys *fk)
3500 {
3501 	bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
3502 	int noff, proto = -1;
3503 
3504 	if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) {
3505 		memset(fk, 0, sizeof(*fk));
3506 		return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
3507 					  fk, NULL, 0, 0, 0, 0);
3508 	}
3509 
3510 	fk->ports.ports = 0;
3511 	memset(&fk->icmp, 0, sizeof(fk->icmp));
3512 	noff = skb_network_offset(skb);
3513 	if (!bond_flow_ip(skb, fk, &noff, &proto, l34))
3514 		return false;
3515 
3516 	/* ICMP error packets contains at least 8 bytes of the header
3517 	 * of the packet which generated the error. Use this information
3518 	 * to correlate ICMP error packets within the same flow which
3519 	 * generated the error.
3520 	 */
3521 	if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6) {
3522 		skb_flow_get_icmp_tci(skb, &fk->icmp, skb->data,
3523 				      skb_transport_offset(skb),
3524 				      skb_headlen(skb));
3525 		if (proto == IPPROTO_ICMP) {
3526 			if (!icmp_is_err(fk->icmp.type))
3527 				return true;
3528 
3529 			noff += sizeof(struct icmphdr);
3530 		} else if (proto == IPPROTO_ICMPV6) {
3531 			if (!icmpv6_is_err(fk->icmp.type))
3532 				return true;
3533 
3534 			noff += sizeof(struct icmp6hdr);
3535 		}
3536 		return bond_flow_ip(skb, fk, &noff, &proto, l34);
3537 	}
3538 
3539 	return true;
3540 }
3541 
3542 /**
3543  * bond_xmit_hash - generate a hash value based on the xmit policy
3544  * @bond: bonding device
3545  * @skb: buffer to use for headers
3546  *
3547  * This function will extract the necessary headers from the skb buffer and use
3548  * them to generate a hash based on the xmit_policy set in the bonding device
3549  */
3550 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3551 {
3552 	struct flow_keys flow;
3553 	u32 hash;
3554 
3555 	if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3556 	    skb->l4_hash)
3557 		return skb->hash;
3558 
3559 	if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3560 	    !bond_flow_dissect(bond, skb, &flow))
3561 		return bond_eth_hash(skb);
3562 
3563 	if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3564 	    bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
3565 		hash = bond_eth_hash(skb);
3566 	} else {
3567 		if (flow.icmp.id)
3568 			memcpy(&hash, &flow.icmp, sizeof(hash));
3569 		else
3570 			memcpy(&hash, &flow.ports.ports, sizeof(hash));
3571 	}
3572 	hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3573 		(__force u32)flow_get_u32_src(&flow);
3574 	hash ^= (hash >> 16);
3575 	hash ^= (hash >> 8);
3576 
3577 	return hash >> 1;
3578 }
3579 
3580 /*-------------------------- Device entry points ----------------------------*/
3581 
3582 void bond_work_init_all(struct bonding *bond)
3583 {
3584 	INIT_DELAYED_WORK(&bond->mcast_work,
3585 			  bond_resend_igmp_join_requests_delayed);
3586 	INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3587 	INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3588 	INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3589 	INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3590 	INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3591 }
3592 
3593 static void bond_work_cancel_all(struct bonding *bond)
3594 {
3595 	cancel_delayed_work_sync(&bond->mii_work);
3596 	cancel_delayed_work_sync(&bond->arp_work);
3597 	cancel_delayed_work_sync(&bond->alb_work);
3598 	cancel_delayed_work_sync(&bond->ad_work);
3599 	cancel_delayed_work_sync(&bond->mcast_work);
3600 	cancel_delayed_work_sync(&bond->slave_arr_work);
3601 }
3602 
3603 static int bond_open(struct net_device *bond_dev)
3604 {
3605 	struct bonding *bond = netdev_priv(bond_dev);
3606 	struct list_head *iter;
3607 	struct slave *slave;
3608 
3609 	/* reset slave->backup and slave->inactive */
3610 	if (bond_has_slaves(bond)) {
3611 		bond_for_each_slave(bond, slave, iter) {
3612 			if (bond_uses_primary(bond) &&
3613 			    slave != rcu_access_pointer(bond->curr_active_slave)) {
3614 				bond_set_slave_inactive_flags(slave,
3615 							      BOND_SLAVE_NOTIFY_NOW);
3616 			} else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3617 				bond_set_slave_active_flags(slave,
3618 							    BOND_SLAVE_NOTIFY_NOW);
3619 			}
3620 		}
3621 	}
3622 
3623 	if (bond_is_lb(bond)) {
3624 		/* bond_alb_initialize must be called before the timer
3625 		 * is started.
3626 		 */
3627 		if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3628 			return -ENOMEM;
3629 		if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3630 			queue_delayed_work(bond->wq, &bond->alb_work, 0);
3631 	}
3632 
3633 	if (bond->params.miimon)  /* link check interval, in milliseconds. */
3634 		queue_delayed_work(bond->wq, &bond->mii_work, 0);
3635 
3636 	if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3637 		queue_delayed_work(bond->wq, &bond->arp_work, 0);
3638 		bond->recv_probe = bond_arp_rcv;
3639 	}
3640 
3641 	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3642 		queue_delayed_work(bond->wq, &bond->ad_work, 0);
3643 		/* register to receive LACPDUs */
3644 		bond->recv_probe = bond_3ad_lacpdu_recv;
3645 		bond_3ad_initiate_agg_selection(bond, 1);
3646 	}
3647 
3648 	if (bond_mode_can_use_xmit_hash(bond))
3649 		bond_update_slave_arr(bond, NULL);
3650 
3651 	return 0;
3652 }
3653 
3654 static int bond_close(struct net_device *bond_dev)
3655 {
3656 	struct bonding *bond = netdev_priv(bond_dev);
3657 
3658 	bond_work_cancel_all(bond);
3659 	bond->send_peer_notif = 0;
3660 	if (bond_is_lb(bond))
3661 		bond_alb_deinitialize(bond);
3662 	bond->recv_probe = NULL;
3663 
3664 	return 0;
3665 }
3666 
3667 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3668  * that some drivers can provide 32bit values only.
3669  */
3670 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3671 			    const struct rtnl_link_stats64 *_new,
3672 			    const struct rtnl_link_stats64 *_old)
3673 {
3674 	const u64 *new = (const u64 *)_new;
3675 	const u64 *old = (const u64 *)_old;
3676 	u64 *res = (u64 *)_res;
3677 	int i;
3678 
3679 	for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3680 		u64 nv = new[i];
3681 		u64 ov = old[i];
3682 		s64 delta = nv - ov;
3683 
3684 		/* detects if this particular field is 32bit only */
3685 		if (((nv | ov) >> 32) == 0)
3686 			delta = (s64)(s32)((u32)nv - (u32)ov);
3687 
3688 		/* filter anomalies, some drivers reset their stats
3689 		 * at down/up events.
3690 		 */
3691 		if (delta > 0)
3692 			res[i] += delta;
3693 	}
3694 }
3695 
3696 #ifdef CONFIG_LOCKDEP
3697 static int bond_get_lowest_level_rcu(struct net_device *dev)
3698 {
3699 	struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
3700 	struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
3701 	int cur = 0, max = 0;
3702 
3703 	now = dev;
3704 	iter = &dev->adj_list.lower;
3705 
3706 	while (1) {
3707 		next = NULL;
3708 		while (1) {
3709 			ldev = netdev_next_lower_dev_rcu(now, &iter);
3710 			if (!ldev)
3711 				break;
3712 
3713 			next = ldev;
3714 			niter = &ldev->adj_list.lower;
3715 			dev_stack[cur] = now;
3716 			iter_stack[cur++] = iter;
3717 			if (max <= cur)
3718 				max = cur;
3719 			break;
3720 		}
3721 
3722 		if (!next) {
3723 			if (!cur)
3724 				return max;
3725 			next = dev_stack[--cur];
3726 			niter = iter_stack[cur];
3727 		}
3728 
3729 		now = next;
3730 		iter = niter;
3731 	}
3732 
3733 	return max;
3734 }
3735 #endif
3736 
3737 static void bond_get_stats(struct net_device *bond_dev,
3738 			   struct rtnl_link_stats64 *stats)
3739 {
3740 	struct bonding *bond = netdev_priv(bond_dev);
3741 	struct rtnl_link_stats64 temp;
3742 	struct list_head *iter;
3743 	struct slave *slave;
3744 	int nest_level = 0;
3745 
3746 
3747 	rcu_read_lock();
3748 #ifdef CONFIG_LOCKDEP
3749 	nest_level = bond_get_lowest_level_rcu(bond_dev);
3750 #endif
3751 
3752 	spin_lock_nested(&bond->stats_lock, nest_level);
3753 	memcpy(stats, &bond->bond_stats, sizeof(*stats));
3754 
3755 	bond_for_each_slave_rcu(bond, slave, iter) {
3756 		const struct rtnl_link_stats64 *new =
3757 			dev_get_stats(slave->dev, &temp);
3758 
3759 		bond_fold_stats(stats, new, &slave->slave_stats);
3760 
3761 		/* save off the slave stats for the next run */
3762 		memcpy(&slave->slave_stats, new, sizeof(*new));
3763 	}
3764 
3765 	memcpy(&bond->bond_stats, stats, sizeof(*stats));
3766 	spin_unlock(&bond->stats_lock);
3767 	rcu_read_unlock();
3768 }
3769 
3770 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3771 {
3772 	struct bonding *bond = netdev_priv(bond_dev);
3773 	struct net_device *slave_dev = NULL;
3774 	struct ifbond k_binfo;
3775 	struct ifbond __user *u_binfo = NULL;
3776 	struct ifslave k_sinfo;
3777 	struct ifslave __user *u_sinfo = NULL;
3778 	struct mii_ioctl_data *mii = NULL;
3779 	struct bond_opt_value newval;
3780 	struct net *net;
3781 	int res = 0;
3782 
3783 	netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3784 
3785 	switch (cmd) {
3786 	case SIOCGMIIPHY:
3787 		mii = if_mii(ifr);
3788 		if (!mii)
3789 			return -EINVAL;
3790 
3791 		mii->phy_id = 0;
3792 		fallthrough;
3793 	case SIOCGMIIREG:
3794 		/* We do this again just in case we were called by SIOCGMIIREG
3795 		 * instead of SIOCGMIIPHY.
3796 		 */
3797 		mii = if_mii(ifr);
3798 		if (!mii)
3799 			return -EINVAL;
3800 
3801 		if (mii->reg_num == 1) {
3802 			mii->val_out = 0;
3803 			if (netif_carrier_ok(bond->dev))
3804 				mii->val_out = BMSR_LSTATUS;
3805 		}
3806 
3807 		return 0;
3808 	case BOND_INFO_QUERY_OLD:
3809 	case SIOCBONDINFOQUERY:
3810 		u_binfo = (struct ifbond __user *)ifr->ifr_data;
3811 
3812 		if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3813 			return -EFAULT;
3814 
3815 		bond_info_query(bond_dev, &k_binfo);
3816 		if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3817 			return -EFAULT;
3818 
3819 		return 0;
3820 	case BOND_SLAVE_INFO_QUERY_OLD:
3821 	case SIOCBONDSLAVEINFOQUERY:
3822 		u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3823 
3824 		if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3825 			return -EFAULT;
3826 
3827 		res = bond_slave_info_query(bond_dev, &k_sinfo);
3828 		if (res == 0 &&
3829 		    copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3830 			return -EFAULT;
3831 
3832 		return res;
3833 	default:
3834 		break;
3835 	}
3836 
3837 	net = dev_net(bond_dev);
3838 
3839 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3840 		return -EPERM;
3841 
3842 	slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3843 
3844 	slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
3845 
3846 	if (!slave_dev)
3847 		return -ENODEV;
3848 
3849 	switch (cmd) {
3850 	case BOND_ENSLAVE_OLD:
3851 	case SIOCBONDENSLAVE:
3852 		res = bond_enslave(bond_dev, slave_dev, NULL);
3853 		break;
3854 	case BOND_RELEASE_OLD:
3855 	case SIOCBONDRELEASE:
3856 		res = bond_release(bond_dev, slave_dev);
3857 		break;
3858 	case BOND_SETHWADDR_OLD:
3859 	case SIOCBONDSETHWADDR:
3860 		res = bond_set_dev_addr(bond_dev, slave_dev);
3861 		break;
3862 	case BOND_CHANGE_ACTIVE_OLD:
3863 	case SIOCBONDCHANGEACTIVE:
3864 		bond_opt_initstr(&newval, slave_dev->name);
3865 		res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3866 					    &newval);
3867 		break;
3868 	default:
3869 		res = -EOPNOTSUPP;
3870 	}
3871 
3872 	return res;
3873 }
3874 
3875 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3876 {
3877 	struct bonding *bond = netdev_priv(bond_dev);
3878 
3879 	if (change & IFF_PROMISC)
3880 		bond_set_promiscuity(bond,
3881 				     bond_dev->flags & IFF_PROMISC ? 1 : -1);
3882 
3883 	if (change & IFF_ALLMULTI)
3884 		bond_set_allmulti(bond,
3885 				  bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3886 }
3887 
3888 static void bond_set_rx_mode(struct net_device *bond_dev)
3889 {
3890 	struct bonding *bond = netdev_priv(bond_dev);
3891 	struct list_head *iter;
3892 	struct slave *slave;
3893 
3894 	rcu_read_lock();
3895 	if (bond_uses_primary(bond)) {
3896 		slave = rcu_dereference(bond->curr_active_slave);
3897 		if (slave) {
3898 			dev_uc_sync(slave->dev, bond_dev);
3899 			dev_mc_sync(slave->dev, bond_dev);
3900 		}
3901 	} else {
3902 		bond_for_each_slave_rcu(bond, slave, iter) {
3903 			dev_uc_sync_multiple(slave->dev, bond_dev);
3904 			dev_mc_sync_multiple(slave->dev, bond_dev);
3905 		}
3906 	}
3907 	rcu_read_unlock();
3908 }
3909 
3910 static int bond_neigh_init(struct neighbour *n)
3911 {
3912 	struct bonding *bond = netdev_priv(n->dev);
3913 	const struct net_device_ops *slave_ops;
3914 	struct neigh_parms parms;
3915 	struct slave *slave;
3916 	int ret = 0;
3917 
3918 	rcu_read_lock();
3919 	slave = bond_first_slave_rcu(bond);
3920 	if (!slave)
3921 		goto out;
3922 	slave_ops = slave->dev->netdev_ops;
3923 	if (!slave_ops->ndo_neigh_setup)
3924 		goto out;
3925 
3926 	/* TODO: find another way [1] to implement this.
3927 	 * Passing a zeroed structure is fragile,
3928 	 * but at least we do not pass garbage.
3929 	 *
3930 	 * [1] One way would be that ndo_neigh_setup() never touch
3931 	 *     struct neigh_parms, but propagate the new neigh_setup()
3932 	 *     back to ___neigh_create() / neigh_parms_alloc()
3933 	 */
3934 	memset(&parms, 0, sizeof(parms));
3935 	ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3936 
3937 	if (ret)
3938 		goto out;
3939 
3940 	if (parms.neigh_setup)
3941 		ret = parms.neigh_setup(n);
3942 out:
3943 	rcu_read_unlock();
3944 	return ret;
3945 }
3946 
3947 /* The bonding ndo_neigh_setup is called at init time beofre any
3948  * slave exists. So we must declare proxy setup function which will
3949  * be used at run time to resolve the actual slave neigh param setup.
3950  *
3951  * It's also called by master devices (such as vlans) to setup their
3952  * underlying devices. In that case - do nothing, we're already set up from
3953  * our init.
3954  */
3955 static int bond_neigh_setup(struct net_device *dev,
3956 			    struct neigh_parms *parms)
3957 {
3958 	/* modify only our neigh_parms */
3959 	if (parms->dev == dev)
3960 		parms->neigh_setup = bond_neigh_init;
3961 
3962 	return 0;
3963 }
3964 
3965 /* Change the MTU of all of a master's slaves to match the master */
3966 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3967 {
3968 	struct bonding *bond = netdev_priv(bond_dev);
3969 	struct slave *slave, *rollback_slave;
3970 	struct list_head *iter;
3971 	int res = 0;
3972 
3973 	netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3974 
3975 	bond_for_each_slave(bond, slave, iter) {
3976 		slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
3977 			   slave, slave->dev->netdev_ops->ndo_change_mtu);
3978 
3979 		res = dev_set_mtu(slave->dev, new_mtu);
3980 
3981 		if (res) {
3982 			/* If we failed to set the slave's mtu to the new value
3983 			 * we must abort the operation even in ACTIVE_BACKUP
3984 			 * mode, because if we allow the backup slaves to have
3985 			 * different mtu values than the active slave we'll
3986 			 * need to change their mtu when doing a failover. That
3987 			 * means changing their mtu from timer context, which
3988 			 * is probably not a good idea.
3989 			 */
3990 			slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
3991 				  res, new_mtu);
3992 			goto unwind;
3993 		}
3994 	}
3995 
3996 	bond_dev->mtu = new_mtu;
3997 
3998 	return 0;
3999 
4000 unwind:
4001 	/* unwind from head to the slave that failed */
4002 	bond_for_each_slave(bond, rollback_slave, iter) {
4003 		int tmp_res;
4004 
4005 		if (rollback_slave == slave)
4006 			break;
4007 
4008 		tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
4009 		if (tmp_res)
4010 			slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
4011 				  tmp_res);
4012 	}
4013 
4014 	return res;
4015 }
4016 
4017 /* Change HW address
4018  *
4019  * Note that many devices must be down to change the HW address, and
4020  * downing the master releases all slaves.  We can make bonds full of
4021  * bonding devices to test this, however.
4022  */
4023 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4024 {
4025 	struct bonding *bond = netdev_priv(bond_dev);
4026 	struct slave *slave, *rollback_slave;
4027 	struct sockaddr_storage *ss = addr, tmp_ss;
4028 	struct list_head *iter;
4029 	int res = 0;
4030 
4031 	if (BOND_MODE(bond) == BOND_MODE_ALB)
4032 		return bond_alb_set_mac_address(bond_dev, addr);
4033 
4034 
4035 	netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
4036 
4037 	/* If fail_over_mac is enabled, do nothing and return success.
4038 	 * Returning an error causes ifenslave to fail.
4039 	 */
4040 	if (bond->params.fail_over_mac &&
4041 	    BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4042 		return 0;
4043 
4044 	if (!is_valid_ether_addr(ss->__data))
4045 		return -EADDRNOTAVAIL;
4046 
4047 	bond_for_each_slave(bond, slave, iter) {
4048 		slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
4049 			  __func__, slave);
4050 		res = dev_set_mac_address(slave->dev, addr, NULL);
4051 		if (res) {
4052 			/* TODO: consider downing the slave
4053 			 * and retry ?
4054 			 * User should expect communications
4055 			 * breakage anyway until ARP finish
4056 			 * updating, so...
4057 			 */
4058 			slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
4059 				  __func__, res);
4060 			goto unwind;
4061 		}
4062 	}
4063 
4064 	/* success */
4065 	memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
4066 	return 0;
4067 
4068 unwind:
4069 	memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
4070 	tmp_ss.ss_family = bond_dev->type;
4071 
4072 	/* unwind from head to the slave that failed */
4073 	bond_for_each_slave(bond, rollback_slave, iter) {
4074 		int tmp_res;
4075 
4076 		if (rollback_slave == slave)
4077 			break;
4078 
4079 		tmp_res = dev_set_mac_address(rollback_slave->dev,
4080 					      (struct sockaddr *)&tmp_ss, NULL);
4081 		if (tmp_res) {
4082 			slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
4083 				   __func__, tmp_res);
4084 		}
4085 	}
4086 
4087 	return res;
4088 }
4089 
4090 /**
4091  * bond_get_slave_by_id - get xmit slave with slave_id
4092  * @bond: bonding device that is transmitting
4093  * @slave_id: slave id up to slave_cnt-1 through which to transmit
4094  *
4095  * This function tries to get slave with slave_id but in case
4096  * it fails, it tries to find the first available slave for transmission.
4097  */
4098 static struct slave *bond_get_slave_by_id(struct bonding *bond,
4099 					  int slave_id)
4100 {
4101 	struct list_head *iter;
4102 	struct slave *slave;
4103 	int i = slave_id;
4104 
4105 	/* Here we start from the slave with slave_id */
4106 	bond_for_each_slave_rcu(bond, slave, iter) {
4107 		if (--i < 0) {
4108 			if (bond_slave_can_tx(slave))
4109 				return slave;
4110 		}
4111 	}
4112 
4113 	/* Here we start from the first slave up to slave_id */
4114 	i = slave_id;
4115 	bond_for_each_slave_rcu(bond, slave, iter) {
4116 		if (--i < 0)
4117 			break;
4118 		if (bond_slave_can_tx(slave))
4119 			return slave;
4120 	}
4121 	/* no slave that can tx has been found */
4122 	return NULL;
4123 }
4124 
4125 /**
4126  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
4127  * @bond: bonding device to use
4128  *
4129  * Based on the value of the bonding device's packets_per_slave parameter
4130  * this function generates a slave id, which is usually used as the next
4131  * slave to transmit through.
4132  */
4133 static u32 bond_rr_gen_slave_id(struct bonding *bond)
4134 {
4135 	u32 slave_id;
4136 	struct reciprocal_value reciprocal_packets_per_slave;
4137 	int packets_per_slave = bond->params.packets_per_slave;
4138 
4139 	switch (packets_per_slave) {
4140 	case 0:
4141 		slave_id = prandom_u32();
4142 		break;
4143 	case 1:
4144 		slave_id = bond->rr_tx_counter;
4145 		break;
4146 	default:
4147 		reciprocal_packets_per_slave =
4148 			bond->params.reciprocal_packets_per_slave;
4149 		slave_id = reciprocal_divide(bond->rr_tx_counter,
4150 					     reciprocal_packets_per_slave);
4151 		break;
4152 	}
4153 	bond->rr_tx_counter++;
4154 
4155 	return slave_id;
4156 }
4157 
4158 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,
4159 						    struct sk_buff *skb)
4160 {
4161 	struct slave *slave;
4162 	int slave_cnt;
4163 	u32 slave_id;
4164 
4165 	/* Start with the curr_active_slave that joined the bond as the
4166 	 * default for sending IGMP traffic.  For failover purposes one
4167 	 * needs to maintain some consistency for the interface that will
4168 	 * send the join/membership reports.  The curr_active_slave found
4169 	 * will send all of this type of traffic.
4170 	 */
4171 	if (skb->protocol == htons(ETH_P_IP)) {
4172 		int noff = skb_network_offset(skb);
4173 		struct iphdr *iph;
4174 
4175 		if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
4176 			goto non_igmp;
4177 
4178 		iph = ip_hdr(skb);
4179 		if (iph->protocol == IPPROTO_IGMP) {
4180 			slave = rcu_dereference(bond->curr_active_slave);
4181 			if (slave)
4182 				return slave;
4183 			return bond_get_slave_by_id(bond, 0);
4184 		}
4185 	}
4186 
4187 non_igmp:
4188 	slave_cnt = READ_ONCE(bond->slave_cnt);
4189 	if (likely(slave_cnt)) {
4190 		slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4191 		return bond_get_slave_by_id(bond, slave_id);
4192 	}
4193 	return NULL;
4194 }
4195 
4196 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
4197 					struct net_device *bond_dev)
4198 {
4199 	struct bonding *bond = netdev_priv(bond_dev);
4200 	struct slave *slave;
4201 
4202 	slave = bond_xmit_roundrobin_slave_get(bond, skb);
4203 	if (likely(slave))
4204 		return bond_dev_queue_xmit(bond, skb, slave->dev);
4205 
4206 	return bond_tx_drop(bond_dev, skb);
4207 }
4208 
4209 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond,
4210 						      struct sk_buff *skb)
4211 {
4212 	return rcu_dereference(bond->curr_active_slave);
4213 }
4214 
4215 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
4216  * the bond has a usable interface.
4217  */
4218 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
4219 					  struct net_device *bond_dev)
4220 {
4221 	struct bonding *bond = netdev_priv(bond_dev);
4222 	struct slave *slave;
4223 
4224 	slave = bond_xmit_activebackup_slave_get(bond, skb);
4225 	if (slave)
4226 		return bond_dev_queue_xmit(bond, skb, slave->dev);
4227 
4228 	return bond_tx_drop(bond_dev, skb);
4229 }
4230 
4231 /* Use this to update slave_array when (a) it's not appropriate to update
4232  * slave_array right away (note that update_slave_array() may sleep)
4233  * and / or (b) RTNL is not held.
4234  */
4235 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
4236 {
4237 	queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
4238 }
4239 
4240 /* Slave array work handler. Holds only RTNL */
4241 static void bond_slave_arr_handler(struct work_struct *work)
4242 {
4243 	struct bonding *bond = container_of(work, struct bonding,
4244 					    slave_arr_work.work);
4245 	int ret;
4246 
4247 	if (!rtnl_trylock())
4248 		goto err;
4249 
4250 	ret = bond_update_slave_arr(bond, NULL);
4251 	rtnl_unlock();
4252 	if (ret) {
4253 		pr_warn_ratelimited("Failed to update slave array from WT\n");
4254 		goto err;
4255 	}
4256 	return;
4257 
4258 err:
4259 	bond_slave_arr_work_rearm(bond, 1);
4260 }
4261 
4262 static void bond_skip_slave(struct bond_up_slave *slaves,
4263 			    struct slave *skipslave)
4264 {
4265 	int idx;
4266 
4267 	/* Rare situation where caller has asked to skip a specific
4268 	 * slave but allocation failed (most likely!). BTW this is
4269 	 * only possible when the call is initiated from
4270 	 * __bond_release_one(). In this situation; overwrite the
4271 	 * skipslave entry in the array with the last entry from the
4272 	 * array to avoid a situation where the xmit path may choose
4273 	 * this to-be-skipped slave to send a packet out.
4274 	 */
4275 	for (idx = 0; slaves && idx < slaves->count; idx++) {
4276 		if (skipslave == slaves->arr[idx]) {
4277 			slaves->arr[idx] =
4278 				slaves->arr[slaves->count - 1];
4279 			slaves->count--;
4280 			break;
4281 		}
4282 	}
4283 }
4284 
4285 static void bond_set_slave_arr(struct bonding *bond,
4286 			       struct bond_up_slave *usable_slaves,
4287 			       struct bond_up_slave *all_slaves)
4288 {
4289 	struct bond_up_slave *usable, *all;
4290 
4291 	usable = rtnl_dereference(bond->usable_slaves);
4292 	rcu_assign_pointer(bond->usable_slaves, usable_slaves);
4293 	kfree_rcu(usable, rcu);
4294 
4295 	all = rtnl_dereference(bond->all_slaves);
4296 	rcu_assign_pointer(bond->all_slaves, all_slaves);
4297 	kfree_rcu(all, rcu);
4298 }
4299 
4300 static void bond_reset_slave_arr(struct bonding *bond)
4301 {
4302 	struct bond_up_slave *usable, *all;
4303 
4304 	usable = rtnl_dereference(bond->usable_slaves);
4305 	if (usable) {
4306 		RCU_INIT_POINTER(bond->usable_slaves, NULL);
4307 		kfree_rcu(usable, rcu);
4308 	}
4309 
4310 	all = rtnl_dereference(bond->all_slaves);
4311 	if (all) {
4312 		RCU_INIT_POINTER(bond->all_slaves, NULL);
4313 		kfree_rcu(all, rcu);
4314 	}
4315 }
4316 
4317 /* Build the usable slaves array in control path for modes that use xmit-hash
4318  * to determine the slave interface -
4319  * (a) BOND_MODE_8023AD
4320  * (b) BOND_MODE_XOR
4321  * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
4322  *
4323  * The caller is expected to hold RTNL only and NO other lock!
4324  */
4325 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
4326 {
4327 	struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;
4328 	struct slave *slave;
4329 	struct list_head *iter;
4330 	int agg_id = 0;
4331 	int ret = 0;
4332 
4333 #ifdef CONFIG_LOCKDEP
4334 	WARN_ON(lockdep_is_held(&bond->mode_lock));
4335 #endif
4336 
4337 	usable_slaves = kzalloc(struct_size(usable_slaves, arr,
4338 					    bond->slave_cnt), GFP_KERNEL);
4339 	all_slaves = kzalloc(struct_size(all_slaves, arr,
4340 					 bond->slave_cnt), GFP_KERNEL);
4341 	if (!usable_slaves || !all_slaves) {
4342 		ret = -ENOMEM;
4343 		goto out;
4344 	}
4345 	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4346 		struct ad_info ad_info;
4347 
4348 		if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
4349 			pr_debug("bond_3ad_get_active_agg_info failed\n");
4350 			/* No active aggragator means it's not safe to use
4351 			 * the previous array.
4352 			 */
4353 			bond_reset_slave_arr(bond);
4354 			goto out;
4355 		}
4356 		agg_id = ad_info.aggregator_id;
4357 	}
4358 	bond_for_each_slave(bond, slave, iter) {
4359 		if (skipslave == slave)
4360 			continue;
4361 
4362 		all_slaves->arr[all_slaves->count++] = slave;
4363 		if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4364 			struct aggregator *agg;
4365 
4366 			agg = SLAVE_AD_INFO(slave)->port.aggregator;
4367 			if (!agg || agg->aggregator_identifier != agg_id)
4368 				continue;
4369 		}
4370 		if (!bond_slave_can_tx(slave))
4371 			continue;
4372 
4373 		slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
4374 			  usable_slaves->count);
4375 
4376 		usable_slaves->arr[usable_slaves->count++] = slave;
4377 	}
4378 
4379 	bond_set_slave_arr(bond, usable_slaves, all_slaves);
4380 	return ret;
4381 out:
4382 	if (ret != 0 && skipslave) {
4383 		bond_skip_slave(rtnl_dereference(bond->all_slaves),
4384 				skipslave);
4385 		bond_skip_slave(rtnl_dereference(bond->usable_slaves),
4386 				skipslave);
4387 	}
4388 	kfree_rcu(all_slaves, rcu);
4389 	kfree_rcu(usable_slaves, rcu);
4390 
4391 	return ret;
4392 }
4393 
4394 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,
4395 						 struct sk_buff *skb,
4396 						 struct bond_up_slave *slaves)
4397 {
4398 	struct slave *slave;
4399 	unsigned int count;
4400 	u32 hash;
4401 
4402 	hash = bond_xmit_hash(bond, skb);
4403 	count = slaves ? READ_ONCE(slaves->count) : 0;
4404 	if (unlikely(!count))
4405 		return NULL;
4406 
4407 	slave = slaves->arr[hash % count];
4408 	return slave;
4409 }
4410 
4411 /* Use this Xmit function for 3AD as well as XOR modes. The current
4412  * usable slave array is formed in the control path. The xmit function
4413  * just calculates hash and sends the packet out.
4414  */
4415 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4416 				     struct net_device *dev)
4417 {
4418 	struct bonding *bond = netdev_priv(dev);
4419 	struct bond_up_slave *slaves;
4420 	struct slave *slave;
4421 
4422 	slaves = rcu_dereference(bond->usable_slaves);
4423 	slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4424 	if (likely(slave))
4425 		return bond_dev_queue_xmit(bond, skb, slave->dev);
4426 
4427 	return bond_tx_drop(dev, skb);
4428 }
4429 
4430 /* in broadcast mode, we send everything to all usable interfaces. */
4431 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4432 				       struct net_device *bond_dev)
4433 {
4434 	struct bonding *bond = netdev_priv(bond_dev);
4435 	struct slave *slave = NULL;
4436 	struct list_head *iter;
4437 
4438 	bond_for_each_slave_rcu(bond, slave, iter) {
4439 		if (bond_is_last_slave(bond, slave))
4440 			break;
4441 		if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4442 			struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4443 
4444 			if (!skb2) {
4445 				net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4446 						    bond_dev->name, __func__);
4447 				continue;
4448 			}
4449 			bond_dev_queue_xmit(bond, skb2, slave->dev);
4450 		}
4451 	}
4452 	if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4453 		return bond_dev_queue_xmit(bond, skb, slave->dev);
4454 
4455 	return bond_tx_drop(bond_dev, skb);
4456 }
4457 
4458 /*------------------------- Device initialization ---------------------------*/
4459 
4460 /* Lookup the slave that corresponds to a qid */
4461 static inline int bond_slave_override(struct bonding *bond,
4462 				      struct sk_buff *skb)
4463 {
4464 	struct slave *slave = NULL;
4465 	struct list_head *iter;
4466 
4467 	if (!skb_rx_queue_recorded(skb))
4468 		return 1;
4469 
4470 	/* Find out if any slaves have the same mapping as this skb. */
4471 	bond_for_each_slave_rcu(bond, slave, iter) {
4472 		if (slave->queue_id == skb_get_queue_mapping(skb)) {
4473 			if (bond_slave_is_up(slave) &&
4474 			    slave->link == BOND_LINK_UP) {
4475 				bond_dev_queue_xmit(bond, skb, slave->dev);
4476 				return 0;
4477 			}
4478 			/* If the slave isn't UP, use default transmit policy. */
4479 			break;
4480 		}
4481 	}
4482 
4483 	return 1;
4484 }
4485 
4486 
4487 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4488 			     struct net_device *sb_dev)
4489 {
4490 	/* This helper function exists to help dev_pick_tx get the correct
4491 	 * destination queue.  Using a helper function skips a call to
4492 	 * skb_tx_hash and will put the skbs in the queue we expect on their
4493 	 * way down to the bonding driver.
4494 	 */
4495 	u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4496 
4497 	/* Save the original txq to restore before passing to the driver */
4498 	qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4499 
4500 	if (unlikely(txq >= dev->real_num_tx_queues)) {
4501 		do {
4502 			txq -= dev->real_num_tx_queues;
4503 		} while (txq >= dev->real_num_tx_queues);
4504 	}
4505 	return txq;
4506 }
4507 
4508 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,
4509 					      struct sk_buff *skb,
4510 					      bool all_slaves)
4511 {
4512 	struct bonding *bond = netdev_priv(master_dev);
4513 	struct bond_up_slave *slaves;
4514 	struct slave *slave = NULL;
4515 
4516 	switch (BOND_MODE(bond)) {
4517 	case BOND_MODE_ROUNDROBIN:
4518 		slave = bond_xmit_roundrobin_slave_get(bond, skb);
4519 		break;
4520 	case BOND_MODE_ACTIVEBACKUP:
4521 		slave = bond_xmit_activebackup_slave_get(bond, skb);
4522 		break;
4523 	case BOND_MODE_8023AD:
4524 	case BOND_MODE_XOR:
4525 		if (all_slaves)
4526 			slaves = rcu_dereference(bond->all_slaves);
4527 		else
4528 			slaves = rcu_dereference(bond->usable_slaves);
4529 		slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4530 		break;
4531 	case BOND_MODE_BROADCAST:
4532 		break;
4533 	case BOND_MODE_ALB:
4534 		slave = bond_xmit_alb_slave_get(bond, skb);
4535 		break;
4536 	case BOND_MODE_TLB:
4537 		slave = bond_xmit_tlb_slave_get(bond, skb);
4538 		break;
4539 	default:
4540 		/* Should never happen, mode already checked */
4541 		WARN_ONCE(true, "Unknown bonding mode");
4542 		break;
4543 	}
4544 
4545 	if (slave)
4546 		return slave->dev;
4547 	return NULL;
4548 }
4549 
4550 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4551 {
4552 	struct bonding *bond = netdev_priv(dev);
4553 
4554 	if (bond_should_override_tx_queue(bond) &&
4555 	    !bond_slave_override(bond, skb))
4556 		return NETDEV_TX_OK;
4557 
4558 	switch (BOND_MODE(bond)) {
4559 	case BOND_MODE_ROUNDROBIN:
4560 		return bond_xmit_roundrobin(skb, dev);
4561 	case BOND_MODE_ACTIVEBACKUP:
4562 		return bond_xmit_activebackup(skb, dev);
4563 	case BOND_MODE_8023AD:
4564 	case BOND_MODE_XOR:
4565 		return bond_3ad_xor_xmit(skb, dev);
4566 	case BOND_MODE_BROADCAST:
4567 		return bond_xmit_broadcast(skb, dev);
4568 	case BOND_MODE_ALB:
4569 		return bond_alb_xmit(skb, dev);
4570 	case BOND_MODE_TLB:
4571 		return bond_tlb_xmit(skb, dev);
4572 	default:
4573 		/* Should never happen, mode already checked */
4574 		netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4575 		WARN_ON_ONCE(1);
4576 		return bond_tx_drop(dev, skb);
4577 	}
4578 }
4579 
4580 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4581 {
4582 	struct bonding *bond = netdev_priv(dev);
4583 	netdev_tx_t ret = NETDEV_TX_OK;
4584 
4585 	/* If we risk deadlock from transmitting this in the
4586 	 * netpoll path, tell netpoll to queue the frame for later tx
4587 	 */
4588 	if (unlikely(is_netpoll_tx_blocked(dev)))
4589 		return NETDEV_TX_BUSY;
4590 
4591 	rcu_read_lock();
4592 	if (bond_has_slaves(bond))
4593 		ret = __bond_start_xmit(skb, dev);
4594 	else
4595 		ret = bond_tx_drop(dev, skb);
4596 	rcu_read_unlock();
4597 
4598 	return ret;
4599 }
4600 
4601 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
4602 {
4603 	if (speed == 0 || speed == SPEED_UNKNOWN)
4604 		speed = slave->speed;
4605 	else
4606 		speed = min(speed, slave->speed);
4607 
4608 	return speed;
4609 }
4610 
4611 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4612 					   struct ethtool_link_ksettings *cmd)
4613 {
4614 	struct bonding *bond = netdev_priv(bond_dev);
4615 	struct list_head *iter;
4616 	struct slave *slave;
4617 	u32 speed = 0;
4618 
4619 	cmd->base.duplex = DUPLEX_UNKNOWN;
4620 	cmd->base.port = PORT_OTHER;
4621 
4622 	/* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4623 	 * do not need to check mode.  Though link speed might not represent
4624 	 * the true receive or transmit bandwidth (not all modes are symmetric)
4625 	 * this is an accurate maximum.
4626 	 */
4627 	bond_for_each_slave(bond, slave, iter) {
4628 		if (bond_slave_can_tx(slave)) {
4629 			if (slave->speed != SPEED_UNKNOWN) {
4630 				if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
4631 					speed = bond_mode_bcast_speed(slave,
4632 								      speed);
4633 				else
4634 					speed += slave->speed;
4635 			}
4636 			if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4637 			    slave->duplex != DUPLEX_UNKNOWN)
4638 				cmd->base.duplex = slave->duplex;
4639 		}
4640 	}
4641 	cmd->base.speed = speed ? : SPEED_UNKNOWN;
4642 
4643 	return 0;
4644 }
4645 
4646 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4647 				     struct ethtool_drvinfo *drvinfo)
4648 {
4649 	strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4650 	snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4651 		 BOND_ABI_VERSION);
4652 }
4653 
4654 static const struct ethtool_ops bond_ethtool_ops = {
4655 	.get_drvinfo		= bond_ethtool_get_drvinfo,
4656 	.get_link		= ethtool_op_get_link,
4657 	.get_link_ksettings	= bond_ethtool_get_link_ksettings,
4658 };
4659 
4660 static const struct net_device_ops bond_netdev_ops = {
4661 	.ndo_init		= bond_init,
4662 	.ndo_uninit		= bond_uninit,
4663 	.ndo_open		= bond_open,
4664 	.ndo_stop		= bond_close,
4665 	.ndo_start_xmit		= bond_start_xmit,
4666 	.ndo_select_queue	= bond_select_queue,
4667 	.ndo_get_stats64	= bond_get_stats,
4668 	.ndo_do_ioctl		= bond_do_ioctl,
4669 	.ndo_change_rx_flags	= bond_change_rx_flags,
4670 	.ndo_set_rx_mode	= bond_set_rx_mode,
4671 	.ndo_change_mtu		= bond_change_mtu,
4672 	.ndo_set_mac_address	= bond_set_mac_address,
4673 	.ndo_neigh_setup	= bond_neigh_setup,
4674 	.ndo_vlan_rx_add_vid	= bond_vlan_rx_add_vid,
4675 	.ndo_vlan_rx_kill_vid	= bond_vlan_rx_kill_vid,
4676 #ifdef CONFIG_NET_POLL_CONTROLLER
4677 	.ndo_netpoll_setup	= bond_netpoll_setup,
4678 	.ndo_netpoll_cleanup	= bond_netpoll_cleanup,
4679 	.ndo_poll_controller	= bond_poll_controller,
4680 #endif
4681 	.ndo_add_slave		= bond_enslave,
4682 	.ndo_del_slave		= bond_release,
4683 	.ndo_fix_features	= bond_fix_features,
4684 	.ndo_features_check	= passthru_features_check,
4685 	.ndo_get_xmit_slave	= bond_xmit_get_slave,
4686 };
4687 
4688 static const struct device_type bond_type = {
4689 	.name = "bond",
4690 };
4691 
4692 static void bond_destructor(struct net_device *bond_dev)
4693 {
4694 	struct bonding *bond = netdev_priv(bond_dev);
4695 	if (bond->wq)
4696 		destroy_workqueue(bond->wq);
4697 }
4698 
4699 void bond_setup(struct net_device *bond_dev)
4700 {
4701 	struct bonding *bond = netdev_priv(bond_dev);
4702 
4703 	spin_lock_init(&bond->mode_lock);
4704 	bond->params = bonding_defaults;
4705 
4706 	/* Initialize pointers */
4707 	bond->dev = bond_dev;
4708 
4709 	/* Initialize the device entry points */
4710 	ether_setup(bond_dev);
4711 	bond_dev->max_mtu = ETH_MAX_MTU;
4712 	bond_dev->netdev_ops = &bond_netdev_ops;
4713 	bond_dev->ethtool_ops = &bond_ethtool_ops;
4714 
4715 	bond_dev->needs_free_netdev = true;
4716 	bond_dev->priv_destructor = bond_destructor;
4717 
4718 	SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4719 
4720 	/* Initialize the device options */
4721 	bond_dev->flags |= IFF_MASTER;
4722 	bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4723 	bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4724 
4725 #ifdef CONFIG_XFRM_OFFLOAD
4726 	/* set up xfrm device ops (only supported in active-backup right now) */
4727 	bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
4728 	bond->xs = NULL;
4729 #endif /* CONFIG_XFRM_OFFLOAD */
4730 
4731 	/* don't acquire bond device's netif_tx_lock when transmitting */
4732 	bond_dev->features |= NETIF_F_LLTX;
4733 
4734 	/* By default, we declare the bond to be fully
4735 	 * VLAN hardware accelerated capable. Special
4736 	 * care is taken in the various xmit functions
4737 	 * when there are slaves that are not hw accel
4738 	 * capable
4739 	 */
4740 
4741 	/* Don't allow bond devices to change network namespaces. */
4742 	bond_dev->features |= NETIF_F_NETNS_LOCAL;
4743 
4744 	bond_dev->hw_features = BOND_VLAN_FEATURES |
4745 				NETIF_F_HW_VLAN_CTAG_RX |
4746 				NETIF_F_HW_VLAN_CTAG_FILTER;
4747 
4748 	bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4749 	bond_dev->features |= bond_dev->hw_features;
4750 	bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
4751 #ifdef CONFIG_XFRM_OFFLOAD
4752 	bond_dev->hw_features |= BOND_XFRM_FEATURES;
4753 	/* Only enable XFRM features if this is an active-backup config */
4754 	if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4755 		bond_dev->features |= BOND_XFRM_FEATURES;
4756 #endif /* CONFIG_XFRM_OFFLOAD */
4757 }
4758 
4759 /* Destroy a bonding device.
4760  * Must be under rtnl_lock when this function is called.
4761  */
4762 static void bond_uninit(struct net_device *bond_dev)
4763 {
4764 	struct bonding *bond = netdev_priv(bond_dev);
4765 	struct bond_up_slave *usable, *all;
4766 	struct list_head *iter;
4767 	struct slave *slave;
4768 
4769 	bond_netpoll_cleanup(bond_dev);
4770 
4771 	/* Release the bonded slaves */
4772 	bond_for_each_slave(bond, slave, iter)
4773 		__bond_release_one(bond_dev, slave->dev, true, true);
4774 	netdev_info(bond_dev, "Released all slaves\n");
4775 
4776 	usable = rtnl_dereference(bond->usable_slaves);
4777 	if (usable) {
4778 		RCU_INIT_POINTER(bond->usable_slaves, NULL);
4779 		kfree_rcu(usable, rcu);
4780 	}
4781 
4782 	all = rtnl_dereference(bond->all_slaves);
4783 	if (all) {
4784 		RCU_INIT_POINTER(bond->all_slaves, NULL);
4785 		kfree_rcu(all, rcu);
4786 	}
4787 
4788 	list_del(&bond->bond_list);
4789 
4790 	bond_debug_unregister(bond);
4791 }
4792 
4793 /*------------------------- Module initialization ---------------------------*/
4794 
4795 static int bond_check_params(struct bond_params *params)
4796 {
4797 	int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4798 	struct bond_opt_value newval;
4799 	const struct bond_opt_value *valptr;
4800 	int arp_all_targets_value = 0;
4801 	u16 ad_actor_sys_prio = 0;
4802 	u16 ad_user_port_key = 0;
4803 	__be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4804 	int arp_ip_count;
4805 	int bond_mode	= BOND_MODE_ROUNDROBIN;
4806 	int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4807 	int lacp_fast = 0;
4808 	int tlb_dynamic_lb;
4809 
4810 	/* Convert string parameters. */
4811 	if (mode) {
4812 		bond_opt_initstr(&newval, mode);
4813 		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4814 		if (!valptr) {
4815 			pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4816 			return -EINVAL;
4817 		}
4818 		bond_mode = valptr->value;
4819 	}
4820 
4821 	if (xmit_hash_policy) {
4822 		if (bond_mode == BOND_MODE_ROUNDROBIN ||
4823 		    bond_mode == BOND_MODE_ACTIVEBACKUP ||
4824 		    bond_mode == BOND_MODE_BROADCAST) {
4825 			pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4826 				bond_mode_name(bond_mode));
4827 		} else {
4828 			bond_opt_initstr(&newval, xmit_hash_policy);
4829 			valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4830 						&newval);
4831 			if (!valptr) {
4832 				pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4833 				       xmit_hash_policy);
4834 				return -EINVAL;
4835 			}
4836 			xmit_hashtype = valptr->value;
4837 		}
4838 	}
4839 
4840 	if (lacp_rate) {
4841 		if (bond_mode != BOND_MODE_8023AD) {
4842 			pr_info("lacp_rate param is irrelevant in mode %s\n",
4843 				bond_mode_name(bond_mode));
4844 		} else {
4845 			bond_opt_initstr(&newval, lacp_rate);
4846 			valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4847 						&newval);
4848 			if (!valptr) {
4849 				pr_err("Error: Invalid lacp rate \"%s\"\n",
4850 				       lacp_rate);
4851 				return -EINVAL;
4852 			}
4853 			lacp_fast = valptr->value;
4854 		}
4855 	}
4856 
4857 	if (ad_select) {
4858 		bond_opt_initstr(&newval, ad_select);
4859 		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4860 					&newval);
4861 		if (!valptr) {
4862 			pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4863 			return -EINVAL;
4864 		}
4865 		params->ad_select = valptr->value;
4866 		if (bond_mode != BOND_MODE_8023AD)
4867 			pr_warn("ad_select param only affects 802.3ad mode\n");
4868 	} else {
4869 		params->ad_select = BOND_AD_STABLE;
4870 	}
4871 
4872 	if (max_bonds < 0) {
4873 		pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4874 			max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4875 		max_bonds = BOND_DEFAULT_MAX_BONDS;
4876 	}
4877 
4878 	if (miimon < 0) {
4879 		pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4880 			miimon, INT_MAX);
4881 		miimon = 0;
4882 	}
4883 
4884 	if (updelay < 0) {
4885 		pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4886 			updelay, INT_MAX);
4887 		updelay = 0;
4888 	}
4889 
4890 	if (downdelay < 0) {
4891 		pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4892 			downdelay, INT_MAX);
4893 		downdelay = 0;
4894 	}
4895 
4896 	if ((use_carrier != 0) && (use_carrier != 1)) {
4897 		pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4898 			use_carrier);
4899 		use_carrier = 1;
4900 	}
4901 
4902 	if (num_peer_notif < 0 || num_peer_notif > 255) {
4903 		pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4904 			num_peer_notif);
4905 		num_peer_notif = 1;
4906 	}
4907 
4908 	/* reset values for 802.3ad/TLB/ALB */
4909 	if (!bond_mode_uses_arp(bond_mode)) {
4910 		if (!miimon) {
4911 			pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4912 			pr_warn("Forcing miimon to 100msec\n");
4913 			miimon = BOND_DEFAULT_MIIMON;
4914 		}
4915 	}
4916 
4917 	if (tx_queues < 1 || tx_queues > 255) {
4918 		pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4919 			tx_queues, BOND_DEFAULT_TX_QUEUES);
4920 		tx_queues = BOND_DEFAULT_TX_QUEUES;
4921 	}
4922 
4923 	if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4924 		pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4925 			all_slaves_active);
4926 		all_slaves_active = 0;
4927 	}
4928 
4929 	if (resend_igmp < 0 || resend_igmp > 255) {
4930 		pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4931 			resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4932 		resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4933 	}
4934 
4935 	bond_opt_initval(&newval, packets_per_slave);
4936 	if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4937 		pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4938 			packets_per_slave, USHRT_MAX);
4939 		packets_per_slave = 1;
4940 	}
4941 
4942 	if (bond_mode == BOND_MODE_ALB) {
4943 		pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
4944 			  updelay);
4945 	}
4946 
4947 	if (!miimon) {
4948 		if (updelay || downdelay) {
4949 			/* just warn the user the up/down delay will have
4950 			 * no effect since miimon is zero...
4951 			 */
4952 			pr_warn("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
4953 				updelay, downdelay);
4954 		}
4955 	} else {
4956 		/* don't allow arp monitoring */
4957 		if (arp_interval) {
4958 			pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4959 				miimon, arp_interval);
4960 			arp_interval = 0;
4961 		}
4962 
4963 		if ((updelay % miimon) != 0) {
4964 			pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4965 				updelay, miimon, (updelay / miimon) * miimon);
4966 		}
4967 
4968 		updelay /= miimon;
4969 
4970 		if ((downdelay % miimon) != 0) {
4971 			pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4972 				downdelay, miimon,
4973 				(downdelay / miimon) * miimon);
4974 		}
4975 
4976 		downdelay /= miimon;
4977 	}
4978 
4979 	if (arp_interval < 0) {
4980 		pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4981 			arp_interval, INT_MAX);
4982 		arp_interval = 0;
4983 	}
4984 
4985 	for (arp_ip_count = 0, i = 0;
4986 	     (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4987 		__be32 ip;
4988 
4989 		/* not a complete check, but good enough to catch mistakes */
4990 		if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4991 		    !bond_is_ip_target_ok(ip)) {
4992 			pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4993 				arp_ip_target[i]);
4994 			arp_interval = 0;
4995 		} else {
4996 			if (bond_get_targets_ip(arp_target, ip) == -1)
4997 				arp_target[arp_ip_count++] = ip;
4998 			else
4999 				pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
5000 					&ip);
5001 		}
5002 	}
5003 
5004 	if (arp_interval && !arp_ip_count) {
5005 		/* don't allow arping if no arp_ip_target given... */
5006 		pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
5007 			arp_interval);
5008 		arp_interval = 0;
5009 	}
5010 
5011 	if (arp_validate) {
5012 		if (!arp_interval) {
5013 			pr_err("arp_validate requires arp_interval\n");
5014 			return -EINVAL;
5015 		}
5016 
5017 		bond_opt_initstr(&newval, arp_validate);
5018 		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
5019 					&newval);
5020 		if (!valptr) {
5021 			pr_err("Error: invalid arp_validate \"%s\"\n",
5022 			       arp_validate);
5023 			return -EINVAL;
5024 		}
5025 		arp_validate_value = valptr->value;
5026 	} else {
5027 		arp_validate_value = 0;
5028 	}
5029 
5030 	if (arp_all_targets) {
5031 		bond_opt_initstr(&newval, arp_all_targets);
5032 		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
5033 					&newval);
5034 		if (!valptr) {
5035 			pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
5036 			       arp_all_targets);
5037 			arp_all_targets_value = 0;
5038 		} else {
5039 			arp_all_targets_value = valptr->value;
5040 		}
5041 	}
5042 
5043 	if (miimon) {
5044 		pr_info("MII link monitoring set to %d ms\n", miimon);
5045 	} else if (arp_interval) {
5046 		valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
5047 					  arp_validate_value);
5048 		pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
5049 			arp_interval, valptr->string, arp_ip_count);
5050 
5051 		for (i = 0; i < arp_ip_count; i++)
5052 			pr_cont(" %s", arp_ip_target[i]);
5053 
5054 		pr_cont("\n");
5055 
5056 	} else if (max_bonds) {
5057 		/* miimon and arp_interval not set, we need one so things
5058 		 * work as expected, see bonding.txt for details
5059 		 */
5060 		pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details\n");
5061 	}
5062 
5063 	if (primary && !bond_mode_uses_primary(bond_mode)) {
5064 		/* currently, using a primary only makes sense
5065 		 * in active backup, TLB or ALB modes
5066 		 */
5067 		pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
5068 			primary, bond_mode_name(bond_mode));
5069 		primary = NULL;
5070 	}
5071 
5072 	if (primary && primary_reselect) {
5073 		bond_opt_initstr(&newval, primary_reselect);
5074 		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
5075 					&newval);
5076 		if (!valptr) {
5077 			pr_err("Error: Invalid primary_reselect \"%s\"\n",
5078 			       primary_reselect);
5079 			return -EINVAL;
5080 		}
5081 		primary_reselect_value = valptr->value;
5082 	} else {
5083 		primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
5084 	}
5085 
5086 	if (fail_over_mac) {
5087 		bond_opt_initstr(&newval, fail_over_mac);
5088 		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
5089 					&newval);
5090 		if (!valptr) {
5091 			pr_err("Error: invalid fail_over_mac \"%s\"\n",
5092 			       fail_over_mac);
5093 			return -EINVAL;
5094 		}
5095 		fail_over_mac_value = valptr->value;
5096 		if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5097 			pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
5098 	} else {
5099 		fail_over_mac_value = BOND_FOM_NONE;
5100 	}
5101 
5102 	bond_opt_initstr(&newval, "default");
5103 	valptr = bond_opt_parse(
5104 			bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
5105 				     &newval);
5106 	if (!valptr) {
5107 		pr_err("Error: No ad_actor_sys_prio default value");
5108 		return -EINVAL;
5109 	}
5110 	ad_actor_sys_prio = valptr->value;
5111 
5112 	valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
5113 				&newval);
5114 	if (!valptr) {
5115 		pr_err("Error: No ad_user_port_key default value");
5116 		return -EINVAL;
5117 	}
5118 	ad_user_port_key = valptr->value;
5119 
5120 	bond_opt_initstr(&newval, "default");
5121 	valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
5122 	if (!valptr) {
5123 		pr_err("Error: No tlb_dynamic_lb default value");
5124 		return -EINVAL;
5125 	}
5126 	tlb_dynamic_lb = valptr->value;
5127 
5128 	if (lp_interval == 0) {
5129 		pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
5130 			INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
5131 		lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
5132 	}
5133 
5134 	/* fill params struct with the proper values */
5135 	params->mode = bond_mode;
5136 	params->xmit_policy = xmit_hashtype;
5137 	params->miimon = miimon;
5138 	params->num_peer_notif = num_peer_notif;
5139 	params->arp_interval = arp_interval;
5140 	params->arp_validate = arp_validate_value;
5141 	params->arp_all_targets = arp_all_targets_value;
5142 	params->updelay = updelay;
5143 	params->downdelay = downdelay;
5144 	params->peer_notif_delay = 0;
5145 	params->use_carrier = use_carrier;
5146 	params->lacp_fast = lacp_fast;
5147 	params->primary[0] = 0;
5148 	params->primary_reselect = primary_reselect_value;
5149 	params->fail_over_mac = fail_over_mac_value;
5150 	params->tx_queues = tx_queues;
5151 	params->all_slaves_active = all_slaves_active;
5152 	params->resend_igmp = resend_igmp;
5153 	params->min_links = min_links;
5154 	params->lp_interval = lp_interval;
5155 	params->packets_per_slave = packets_per_slave;
5156 	params->tlb_dynamic_lb = tlb_dynamic_lb;
5157 	params->ad_actor_sys_prio = ad_actor_sys_prio;
5158 	eth_zero_addr(params->ad_actor_system);
5159 	params->ad_user_port_key = ad_user_port_key;
5160 	if (packets_per_slave > 0) {
5161 		params->reciprocal_packets_per_slave =
5162 			reciprocal_value(packets_per_slave);
5163 	} else {
5164 		/* reciprocal_packets_per_slave is unused if
5165 		 * packets_per_slave is 0 or 1, just initialize it
5166 		 */
5167 		params->reciprocal_packets_per_slave =
5168 			(struct reciprocal_value) { 0 };
5169 	}
5170 
5171 	if (primary) {
5172 		strncpy(params->primary, primary, IFNAMSIZ);
5173 		params->primary[IFNAMSIZ - 1] = 0;
5174 	}
5175 
5176 	memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5177 
5178 	return 0;
5179 }
5180 
5181 /* Called from registration process */
5182 static int bond_init(struct net_device *bond_dev)
5183 {
5184 	struct bonding *bond = netdev_priv(bond_dev);
5185 	struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
5186 
5187 	netdev_dbg(bond_dev, "Begin bond_init\n");
5188 
5189 	bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
5190 	if (!bond->wq)
5191 		return -ENOMEM;
5192 
5193 	spin_lock_init(&bond->stats_lock);
5194 	netdev_lockdep_set_classes(bond_dev);
5195 
5196 	list_add_tail(&bond->bond_list, &bn->dev_list);
5197 
5198 	bond_prepare_sysfs_group(bond);
5199 
5200 	bond_debug_register(bond);
5201 
5202 	/* Ensure valid dev_addr */
5203 	if (is_zero_ether_addr(bond_dev->dev_addr) &&
5204 	    bond_dev->addr_assign_type == NET_ADDR_PERM)
5205 		eth_hw_addr_random(bond_dev);
5206 
5207 	return 0;
5208 }
5209 
5210 unsigned int bond_get_num_tx_queues(void)
5211 {
5212 	return tx_queues;
5213 }
5214 
5215 /* Create a new bond based on the specified name and bonding parameters.
5216  * If name is NULL, obtain a suitable "bond%d" name for us.
5217  * Caller must NOT hold rtnl_lock; we need to release it here before we
5218  * set up our sysfs entries.
5219  */
5220 int bond_create(struct net *net, const char *name)
5221 {
5222 	struct net_device *bond_dev;
5223 	struct bonding *bond;
5224 	struct alb_bond_info *bond_info;
5225 	int res;
5226 
5227 	rtnl_lock();
5228 
5229 	bond_dev = alloc_netdev_mq(sizeof(struct bonding),
5230 				   name ? name : "bond%d", NET_NAME_UNKNOWN,
5231 				   bond_setup, tx_queues);
5232 	if (!bond_dev) {
5233 		pr_err("%s: eek! can't alloc netdev!\n", name);
5234 		rtnl_unlock();
5235 		return -ENOMEM;
5236 	}
5237 
5238 	/*
5239 	 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
5240 	 * It is set to 0 by default which is wrong.
5241 	 */
5242 	bond = netdev_priv(bond_dev);
5243 	bond_info = &(BOND_ALB_INFO(bond));
5244 	bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
5245 
5246 	dev_net_set(bond_dev, net);
5247 	bond_dev->rtnl_link_ops = &bond_link_ops;
5248 
5249 	res = register_netdevice(bond_dev);
5250 	if (res < 0) {
5251 		free_netdev(bond_dev);
5252 		rtnl_unlock();
5253 
5254 		return res;
5255 	}
5256 
5257 	netif_carrier_off(bond_dev);
5258 
5259 	bond_work_init_all(bond);
5260 
5261 	rtnl_unlock();
5262 	return 0;
5263 }
5264 
5265 static int __net_init bond_net_init(struct net *net)
5266 {
5267 	struct bond_net *bn = net_generic(net, bond_net_id);
5268 
5269 	bn->net = net;
5270 	INIT_LIST_HEAD(&bn->dev_list);
5271 
5272 	bond_create_proc_dir(bn);
5273 	bond_create_sysfs(bn);
5274 
5275 	return 0;
5276 }
5277 
5278 static void __net_exit bond_net_exit(struct net *net)
5279 {
5280 	struct bond_net *bn = net_generic(net, bond_net_id);
5281 	struct bonding *bond, *tmp_bond;
5282 	LIST_HEAD(list);
5283 
5284 	bond_destroy_sysfs(bn);
5285 
5286 	/* Kill off any bonds created after unregistering bond rtnl ops */
5287 	rtnl_lock();
5288 	list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
5289 		unregister_netdevice_queue(bond->dev, &list);
5290 	unregister_netdevice_many(&list);
5291 	rtnl_unlock();
5292 
5293 	bond_destroy_proc_dir(bn);
5294 }
5295 
5296 static struct pernet_operations bond_net_ops = {
5297 	.init = bond_net_init,
5298 	.exit = bond_net_exit,
5299 	.id   = &bond_net_id,
5300 	.size = sizeof(struct bond_net),
5301 };
5302 
5303 static int __init bonding_init(void)
5304 {
5305 	int i;
5306 	int res;
5307 
5308 	res = bond_check_params(&bonding_defaults);
5309 	if (res)
5310 		goto out;
5311 
5312 	res = register_pernet_subsys(&bond_net_ops);
5313 	if (res)
5314 		goto out;
5315 
5316 	res = bond_netlink_init();
5317 	if (res)
5318 		goto err_link;
5319 
5320 	bond_create_debugfs();
5321 
5322 	for (i = 0; i < max_bonds; i++) {
5323 		res = bond_create(&init_net, NULL);
5324 		if (res)
5325 			goto err;
5326 	}
5327 
5328 	skb_flow_dissector_init(&flow_keys_bonding,
5329 				flow_keys_bonding_keys,
5330 				ARRAY_SIZE(flow_keys_bonding_keys));
5331 
5332 	register_netdevice_notifier(&bond_netdev_notifier);
5333 out:
5334 	return res;
5335 err:
5336 	bond_destroy_debugfs();
5337 	bond_netlink_fini();
5338 err_link:
5339 	unregister_pernet_subsys(&bond_net_ops);
5340 	goto out;
5341 
5342 }
5343 
5344 static void __exit bonding_exit(void)
5345 {
5346 	unregister_netdevice_notifier(&bond_netdev_notifier);
5347 
5348 	bond_destroy_debugfs();
5349 
5350 	bond_netlink_fini();
5351 	unregister_pernet_subsys(&bond_net_ops);
5352 
5353 #ifdef CONFIG_NET_POLL_CONTROLLER
5354 	/* Make sure we don't have an imbalance on our netpoll blocking */
5355 	WARN_ON(atomic_read(&netpoll_block_tx));
5356 #endif
5357 }
5358 
5359 module_init(bonding_init);
5360 module_exit(bonding_exit);
5361 MODULE_LICENSE("GPL");
5362 MODULE_DESCRIPTION(DRV_DESCRIPTION);
5363 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5364