xref: /openbmc/linux/drivers/net/bonding/bond_main.c (revision e2f1cf25)
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/tcp.h>
45 #include <linux/udp.h>
46 #include <linux/slab.h>
47 #include <linux/string.h>
48 #include <linux/init.h>
49 #include <linux/timer.h>
50 #include <linux/socket.h>
51 #include <linux/ctype.h>
52 #include <linux/inet.h>
53 #include <linux/bitops.h>
54 #include <linux/io.h>
55 #include <asm/dma.h>
56 #include <linux/uaccess.h>
57 #include <linux/errno.h>
58 #include <linux/netdevice.h>
59 #include <linux/inetdevice.h>
60 #include <linux/igmp.h>
61 #include <linux/etherdevice.h>
62 #include <linux/skbuff.h>
63 #include <net/sock.h>
64 #include <linux/rtnetlink.h>
65 #include <linux/smp.h>
66 #include <linux/if_ether.h>
67 #include <net/arp.h>
68 #include <linux/mii.h>
69 #include <linux/ethtool.h>
70 #include <linux/if_vlan.h>
71 #include <linux/if_bonding.h>
72 #include <linux/jiffies.h>
73 #include <linux/preempt.h>
74 #include <net/route.h>
75 #include <net/net_namespace.h>
76 #include <net/netns/generic.h>
77 #include <net/pkt_sched.h>
78 #include <linux/rculist.h>
79 #include <net/flow_dissector.h>
80 #include <net/switchdev.h>
81 #include <net/bonding.h>
82 #include <net/bond_3ad.h>
83 #include <net/bond_alb.h>
84 
85 #include "bonding_priv.h"
86 
87 /*---------------------------- Module parameters ----------------------------*/
88 
89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
90 
91 static int max_bonds	= BOND_DEFAULT_MAX_BONDS;
92 static int tx_queues	= BOND_DEFAULT_TX_QUEUES;
93 static int num_peer_notif = 1;
94 static int miimon;
95 static int updelay;
96 static int downdelay;
97 static int use_carrier	= 1;
98 static char *mode;
99 static char *primary;
100 static char *primary_reselect;
101 static char *lacp_rate;
102 static int min_links;
103 static char *ad_select;
104 static char *xmit_hash_policy;
105 static int arp_interval;
106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
107 static char *arp_validate;
108 static char *arp_all_targets;
109 static char *fail_over_mac;
110 static int all_slaves_active;
111 static struct bond_params bonding_defaults;
112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
113 static int packets_per_slave = 1;
114 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
115 
116 module_param(max_bonds, int, 0);
117 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
118 module_param(tx_queues, int, 0);
119 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
120 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
121 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
122 			       "failover event (alias of num_unsol_na)");
123 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
124 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
125 			       "failover event (alias of num_grat_arp)");
126 module_param(miimon, int, 0);
127 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
128 module_param(updelay, int, 0);
129 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
130 module_param(downdelay, int, 0);
131 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
132 			    "in milliseconds");
133 module_param(use_carrier, int, 0);
134 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
135 			      "0 for off, 1 for on (default)");
136 module_param(mode, charp, 0);
137 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
138 		       "1 for active-backup, 2 for balance-xor, "
139 		       "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
140 		       "6 for balance-alb");
141 module_param(primary, charp, 0);
142 MODULE_PARM_DESC(primary, "Primary network device to use");
143 module_param(primary_reselect, charp, 0);
144 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
145 				   "once it comes up; "
146 				   "0 for always (default), "
147 				   "1 for only if speed of primary is "
148 				   "better, "
149 				   "2 for only on active slave "
150 				   "failure");
151 module_param(lacp_rate, charp, 0);
152 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
153 			    "0 for slow, 1 for fast");
154 module_param(ad_select, charp, 0);
155 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
156 			    "0 for stable (default), 1 for bandwidth, "
157 			    "2 for count");
158 module_param(min_links, int, 0);
159 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
160 
161 module_param(xmit_hash_policy, charp, 0);
162 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
163 				   "0 for layer 2 (default), 1 for layer 3+4, "
164 				   "2 for layer 2+3, 3 for encap layer 2+3, "
165 				   "4 for encap layer 3+4");
166 module_param(arp_interval, int, 0);
167 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
168 module_param_array(arp_ip_target, charp, NULL, 0);
169 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
170 module_param(arp_validate, charp, 0);
171 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
172 			       "0 for none (default), 1 for active, "
173 			       "2 for backup, 3 for all");
174 module_param(arp_all_targets, charp, 0);
175 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
176 module_param(fail_over_mac, charp, 0);
177 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
178 				"the same MAC; 0 for none (default), "
179 				"1 for active, 2 for follow");
180 module_param(all_slaves_active, int, 0);
181 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
182 				     "by setting active flag for all slaves; "
183 				     "0 for never (default), 1 for always.");
184 module_param(resend_igmp, int, 0);
185 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
186 			      "link failure");
187 module_param(packets_per_slave, int, 0);
188 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
189 				    "mode; 0 for a random slave, 1 packet per "
190 				    "slave (default), >1 packets per slave.");
191 module_param(lp_interval, uint, 0);
192 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
193 			      "the bonding driver sends learning packets to "
194 			      "each slaves peer switch. The default is 1.");
195 
196 /*----------------------------- Global variables ----------------------------*/
197 
198 #ifdef CONFIG_NET_POLL_CONTROLLER
199 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
200 #endif
201 
202 int bond_net_id __read_mostly;
203 
204 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
205 static int arp_ip_count;
206 static int bond_mode	= BOND_MODE_ROUNDROBIN;
207 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
208 static int lacp_fast;
209 
210 /*-------------------------- Forward declarations ---------------------------*/
211 
212 static int bond_init(struct net_device *bond_dev);
213 static void bond_uninit(struct net_device *bond_dev);
214 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
215 						struct rtnl_link_stats64 *stats);
216 static void bond_slave_arr_handler(struct work_struct *work);
217 
218 /*---------------------------- General routines -----------------------------*/
219 
220 const char *bond_mode_name(int mode)
221 {
222 	static const char *names[] = {
223 		[BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
224 		[BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
225 		[BOND_MODE_XOR] = "load balancing (xor)",
226 		[BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
227 		[BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
228 		[BOND_MODE_TLB] = "transmit load balancing",
229 		[BOND_MODE_ALB] = "adaptive load balancing",
230 	};
231 
232 	if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
233 		return "unknown";
234 
235 	return names[mode];
236 }
237 
238 /*---------------------------------- VLAN -----------------------------------*/
239 
240 /**
241  * bond_dev_queue_xmit - Prepare skb for xmit.
242  *
243  * @bond: bond device that got this skb for tx.
244  * @skb: hw accel VLAN tagged skb to transmit
245  * @slave_dev: slave that is supposed to xmit this skbuff
246  */
247 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
248 			struct net_device *slave_dev)
249 {
250 	skb->dev = slave_dev;
251 
252 	BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
253 		     sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
254 	skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
255 
256 	if (unlikely(netpoll_tx_running(bond->dev)))
257 		bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
258 	else
259 		dev_queue_xmit(skb);
260 }
261 
262 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
263  * We don't protect the slave list iteration with a lock because:
264  * a. This operation is performed in IOCTL context,
265  * b. The operation is protected by the RTNL semaphore in the 8021q code,
266  * c. Holding a lock with BH disabled while directly calling a base driver
267  *    entry point is generally a BAD idea.
268  *
269  * The design of synchronization/protection for this operation in the 8021q
270  * module is good for one or more VLAN devices over a single physical device
271  * and cannot be extended for a teaming solution like bonding, so there is a
272  * potential race condition here where a net device from the vlan group might
273  * be referenced (either by a base driver or the 8021q code) while it is being
274  * removed from the system. However, it turns out we're not making matters
275  * worse, and if it works for regular VLAN usage it will work here too.
276 */
277 
278 /**
279  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
280  * @bond_dev: bonding net device that got called
281  * @vid: vlan id being added
282  */
283 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
284 				__be16 proto, u16 vid)
285 {
286 	struct bonding *bond = netdev_priv(bond_dev);
287 	struct slave *slave, *rollback_slave;
288 	struct list_head *iter;
289 	int res;
290 
291 	bond_for_each_slave(bond, slave, iter) {
292 		res = vlan_vid_add(slave->dev, proto, vid);
293 		if (res)
294 			goto unwind;
295 	}
296 
297 	return 0;
298 
299 unwind:
300 	/* unwind to the slave that failed */
301 	bond_for_each_slave(bond, rollback_slave, iter) {
302 		if (rollback_slave == slave)
303 			break;
304 
305 		vlan_vid_del(rollback_slave->dev, proto, vid);
306 	}
307 
308 	return res;
309 }
310 
311 /**
312  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
313  * @bond_dev: bonding net device that got called
314  * @vid: vlan id being removed
315  */
316 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
317 				 __be16 proto, u16 vid)
318 {
319 	struct bonding *bond = netdev_priv(bond_dev);
320 	struct list_head *iter;
321 	struct slave *slave;
322 
323 	bond_for_each_slave(bond, slave, iter)
324 		vlan_vid_del(slave->dev, proto, vid);
325 
326 	if (bond_is_lb(bond))
327 		bond_alb_clear_vlan(bond, vid);
328 
329 	return 0;
330 }
331 
332 /*------------------------------- Link status -------------------------------*/
333 
334 /* Set the carrier state for the master according to the state of its
335  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
336  * do special 802.3ad magic.
337  *
338  * Returns zero if carrier state does not change, nonzero if it does.
339  */
340 int bond_set_carrier(struct bonding *bond)
341 {
342 	struct list_head *iter;
343 	struct slave *slave;
344 
345 	if (!bond_has_slaves(bond))
346 		goto down;
347 
348 	if (BOND_MODE(bond) == BOND_MODE_8023AD)
349 		return bond_3ad_set_carrier(bond);
350 
351 	bond_for_each_slave(bond, slave, iter) {
352 		if (slave->link == BOND_LINK_UP) {
353 			if (!netif_carrier_ok(bond->dev)) {
354 				netif_carrier_on(bond->dev);
355 				return 1;
356 			}
357 			return 0;
358 		}
359 	}
360 
361 down:
362 	if (netif_carrier_ok(bond->dev)) {
363 		netif_carrier_off(bond->dev);
364 		return 1;
365 	}
366 	return 0;
367 }
368 
369 /* Get link speed and duplex from the slave's base driver
370  * using ethtool. If for some reason the call fails or the
371  * values are invalid, set speed and duplex to -1,
372  * and return.
373  */
374 static void bond_update_speed_duplex(struct slave *slave)
375 {
376 	struct net_device *slave_dev = slave->dev;
377 	struct ethtool_cmd ecmd;
378 	u32 slave_speed;
379 	int res;
380 
381 	slave->speed = SPEED_UNKNOWN;
382 	slave->duplex = DUPLEX_UNKNOWN;
383 
384 	res = __ethtool_get_settings(slave_dev, &ecmd);
385 	if (res < 0)
386 		return;
387 
388 	slave_speed = ethtool_cmd_speed(&ecmd);
389 	if (slave_speed == 0 || slave_speed == ((__u32) -1))
390 		return;
391 
392 	switch (ecmd.duplex) {
393 	case DUPLEX_FULL:
394 	case DUPLEX_HALF:
395 		break;
396 	default:
397 		return;
398 	}
399 
400 	slave->speed = slave_speed;
401 	slave->duplex = ecmd.duplex;
402 
403 	return;
404 }
405 
406 const char *bond_slave_link_status(s8 link)
407 {
408 	switch (link) {
409 	case BOND_LINK_UP:
410 		return "up";
411 	case BOND_LINK_FAIL:
412 		return "going down";
413 	case BOND_LINK_DOWN:
414 		return "down";
415 	case BOND_LINK_BACK:
416 		return "going back";
417 	default:
418 		return "unknown";
419 	}
420 }
421 
422 /* if <dev> supports MII link status reporting, check its link status.
423  *
424  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
425  * depending upon the setting of the use_carrier parameter.
426  *
427  * Return either BMSR_LSTATUS, meaning that the link is up (or we
428  * can't tell and just pretend it is), or 0, meaning that the link is
429  * down.
430  *
431  * If reporting is non-zero, instead of faking link up, return -1 if
432  * both ETHTOOL and MII ioctls fail (meaning the device does not
433  * support them).  If use_carrier is set, return whatever it says.
434  * It'd be nice if there was a good way to tell if a driver supports
435  * netif_carrier, but there really isn't.
436  */
437 static int bond_check_dev_link(struct bonding *bond,
438 			       struct net_device *slave_dev, int reporting)
439 {
440 	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
441 	int (*ioctl)(struct net_device *, struct ifreq *, int);
442 	struct ifreq ifr;
443 	struct mii_ioctl_data *mii;
444 
445 	if (!reporting && !netif_running(slave_dev))
446 		return 0;
447 
448 	if (bond->params.use_carrier)
449 		return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
450 
451 	/* Try to get link status using Ethtool first. */
452 	if (slave_dev->ethtool_ops->get_link)
453 		return slave_dev->ethtool_ops->get_link(slave_dev) ?
454 			BMSR_LSTATUS : 0;
455 
456 	/* Ethtool can't be used, fallback to MII ioctls. */
457 	ioctl = slave_ops->ndo_do_ioctl;
458 	if (ioctl) {
459 		/* TODO: set pointer to correct ioctl on a per team member
460 		 *       bases to make this more efficient. that is, once
461 		 *       we determine the correct ioctl, we will always
462 		 *       call it and not the others for that team
463 		 *       member.
464 		 */
465 
466 		/* We cannot assume that SIOCGMIIPHY will also read a
467 		 * register; not all network drivers (e.g., e100)
468 		 * support that.
469 		 */
470 
471 		/* Yes, the mii is overlaid on the ifreq.ifr_ifru */
472 		strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
473 		mii = if_mii(&ifr);
474 		if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
475 			mii->reg_num = MII_BMSR;
476 			if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
477 				return mii->val_out & BMSR_LSTATUS;
478 		}
479 	}
480 
481 	/* If reporting, report that either there's no dev->do_ioctl,
482 	 * or both SIOCGMIIREG and get_link failed (meaning that we
483 	 * cannot report link status).  If not reporting, pretend
484 	 * we're ok.
485 	 */
486 	return reporting ? -1 : BMSR_LSTATUS;
487 }
488 
489 /*----------------------------- Multicast list ------------------------------*/
490 
491 /* Push the promiscuity flag down to appropriate slaves */
492 static int bond_set_promiscuity(struct bonding *bond, int inc)
493 {
494 	struct list_head *iter;
495 	int err = 0;
496 
497 	if (bond_uses_primary(bond)) {
498 		struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
499 
500 		if (curr_active)
501 			err = dev_set_promiscuity(curr_active->dev, inc);
502 	} else {
503 		struct slave *slave;
504 
505 		bond_for_each_slave(bond, slave, iter) {
506 			err = dev_set_promiscuity(slave->dev, inc);
507 			if (err)
508 				return err;
509 		}
510 	}
511 	return err;
512 }
513 
514 /* Push the allmulti flag down to all slaves */
515 static int bond_set_allmulti(struct bonding *bond, int inc)
516 {
517 	struct list_head *iter;
518 	int err = 0;
519 
520 	if (bond_uses_primary(bond)) {
521 		struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
522 
523 		if (curr_active)
524 			err = dev_set_allmulti(curr_active->dev, inc);
525 	} else {
526 		struct slave *slave;
527 
528 		bond_for_each_slave(bond, slave, iter) {
529 			err = dev_set_allmulti(slave->dev, inc);
530 			if (err)
531 				return err;
532 		}
533 	}
534 	return err;
535 }
536 
537 /* Retrieve the list of registered multicast addresses for the bonding
538  * device and retransmit an IGMP JOIN request to the current active
539  * slave.
540  */
541 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
542 {
543 	struct bonding *bond = container_of(work, struct bonding,
544 					    mcast_work.work);
545 
546 	if (!rtnl_trylock()) {
547 		queue_delayed_work(bond->wq, &bond->mcast_work, 1);
548 		return;
549 	}
550 	call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
551 
552 	if (bond->igmp_retrans > 1) {
553 		bond->igmp_retrans--;
554 		queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
555 	}
556 	rtnl_unlock();
557 }
558 
559 /* Flush bond's hardware addresses from slave */
560 static void bond_hw_addr_flush(struct net_device *bond_dev,
561 			       struct net_device *slave_dev)
562 {
563 	struct bonding *bond = netdev_priv(bond_dev);
564 
565 	dev_uc_unsync(slave_dev, bond_dev);
566 	dev_mc_unsync(slave_dev, bond_dev);
567 
568 	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
569 		/* del lacpdu mc addr from mc list */
570 		u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
571 
572 		dev_mc_del(slave_dev, lacpdu_multicast);
573 	}
574 }
575 
576 /*--------------------------- Active slave change ---------------------------*/
577 
578 /* Update the hardware address list and promisc/allmulti for the new and
579  * old active slaves (if any).  Modes that are not using primary keep all
580  * slaves up date at all times; only the modes that use primary need to call
581  * this function to swap these settings during a failover.
582  */
583 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
584 			      struct slave *old_active)
585 {
586 	if (old_active) {
587 		if (bond->dev->flags & IFF_PROMISC)
588 			dev_set_promiscuity(old_active->dev, -1);
589 
590 		if (bond->dev->flags & IFF_ALLMULTI)
591 			dev_set_allmulti(old_active->dev, -1);
592 
593 		bond_hw_addr_flush(bond->dev, old_active->dev);
594 	}
595 
596 	if (new_active) {
597 		/* FIXME: Signal errors upstream. */
598 		if (bond->dev->flags & IFF_PROMISC)
599 			dev_set_promiscuity(new_active->dev, 1);
600 
601 		if (bond->dev->flags & IFF_ALLMULTI)
602 			dev_set_allmulti(new_active->dev, 1);
603 
604 		netif_addr_lock_bh(bond->dev);
605 		dev_uc_sync(new_active->dev, bond->dev);
606 		dev_mc_sync(new_active->dev, bond->dev);
607 		netif_addr_unlock_bh(bond->dev);
608 	}
609 }
610 
611 /**
612  * bond_set_dev_addr - clone slave's address to bond
613  * @bond_dev: bond net device
614  * @slave_dev: slave net device
615  *
616  * Should be called with RTNL held.
617  */
618 static void bond_set_dev_addr(struct net_device *bond_dev,
619 			      struct net_device *slave_dev)
620 {
621 	netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
622 		   bond_dev, slave_dev, slave_dev->addr_len);
623 	memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
624 	bond_dev->addr_assign_type = NET_ADDR_STOLEN;
625 	call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
626 }
627 
628 static struct slave *bond_get_old_active(struct bonding *bond,
629 					 struct slave *new_active)
630 {
631 	struct slave *slave;
632 	struct list_head *iter;
633 
634 	bond_for_each_slave(bond, slave, iter) {
635 		if (slave == new_active)
636 			continue;
637 
638 		if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
639 			return slave;
640 	}
641 
642 	return NULL;
643 }
644 
645 /* bond_do_fail_over_mac
646  *
647  * Perform special MAC address swapping for fail_over_mac settings
648  *
649  * Called with RTNL
650  */
651 static void bond_do_fail_over_mac(struct bonding *bond,
652 				  struct slave *new_active,
653 				  struct slave *old_active)
654 {
655 	u8 tmp_mac[ETH_ALEN];
656 	struct sockaddr saddr;
657 	int rv;
658 
659 	switch (bond->params.fail_over_mac) {
660 	case BOND_FOM_ACTIVE:
661 		if (new_active)
662 			bond_set_dev_addr(bond->dev, new_active->dev);
663 		break;
664 	case BOND_FOM_FOLLOW:
665 		/* if new_active && old_active, swap them
666 		 * if just old_active, do nothing (going to no active slave)
667 		 * if just new_active, set new_active to bond's MAC
668 		 */
669 		if (!new_active)
670 			return;
671 
672 		if (!old_active)
673 			old_active = bond_get_old_active(bond, new_active);
674 
675 		if (old_active) {
676 			ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
677 			ether_addr_copy(saddr.sa_data,
678 					old_active->dev->dev_addr);
679 			saddr.sa_family = new_active->dev->type;
680 		} else {
681 			ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
682 			saddr.sa_family = bond->dev->type;
683 		}
684 
685 		rv = dev_set_mac_address(new_active->dev, &saddr);
686 		if (rv) {
687 			netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
688 				   -rv, new_active->dev->name);
689 			goto out;
690 		}
691 
692 		if (!old_active)
693 			goto out;
694 
695 		ether_addr_copy(saddr.sa_data, tmp_mac);
696 		saddr.sa_family = old_active->dev->type;
697 
698 		rv = dev_set_mac_address(old_active->dev, &saddr);
699 		if (rv)
700 			netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
701 				   -rv, new_active->dev->name);
702 out:
703 		break;
704 	default:
705 		netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
706 			   bond->params.fail_over_mac);
707 		break;
708 	}
709 
710 }
711 
712 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
713 {
714 	struct slave *prim = rtnl_dereference(bond->primary_slave);
715 	struct slave *curr = rtnl_dereference(bond->curr_active_slave);
716 
717 	if (!prim || prim->link != BOND_LINK_UP) {
718 		if (!curr || curr->link != BOND_LINK_UP)
719 			return NULL;
720 		return curr;
721 	}
722 
723 	if (bond->force_primary) {
724 		bond->force_primary = false;
725 		return prim;
726 	}
727 
728 	if (!curr || curr->link != BOND_LINK_UP)
729 		return prim;
730 
731 	/* At this point, prim and curr are both up */
732 	switch (bond->params.primary_reselect) {
733 	case BOND_PRI_RESELECT_ALWAYS:
734 		return prim;
735 	case BOND_PRI_RESELECT_BETTER:
736 		if (prim->speed < curr->speed)
737 			return curr;
738 		if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
739 			return curr;
740 		return prim;
741 	case BOND_PRI_RESELECT_FAILURE:
742 		return curr;
743 	default:
744 		netdev_err(bond->dev, "impossible primary_reselect %d\n",
745 			   bond->params.primary_reselect);
746 		return curr;
747 	}
748 }
749 
750 /**
751  * bond_find_best_slave - select the best available slave to be the active one
752  * @bond: our bonding struct
753  */
754 static struct slave *bond_find_best_slave(struct bonding *bond)
755 {
756 	struct slave *slave, *bestslave = NULL;
757 	struct list_head *iter;
758 	int mintime = bond->params.updelay;
759 
760 	slave = bond_choose_primary_or_current(bond);
761 	if (slave)
762 		return slave;
763 
764 	bond_for_each_slave(bond, slave, iter) {
765 		if (slave->link == BOND_LINK_UP)
766 			return slave;
767 		if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
768 		    slave->delay < mintime) {
769 			mintime = slave->delay;
770 			bestslave = slave;
771 		}
772 	}
773 
774 	return bestslave;
775 }
776 
777 static bool bond_should_notify_peers(struct bonding *bond)
778 {
779 	struct slave *slave;
780 
781 	rcu_read_lock();
782 	slave = rcu_dereference(bond->curr_active_slave);
783 	rcu_read_unlock();
784 
785 	netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
786 		   slave ? slave->dev->name : "NULL");
787 
788 	if (!slave || !bond->send_peer_notif ||
789 	    !netif_carrier_ok(bond->dev) ||
790 	    test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
791 		return false;
792 
793 	return true;
794 }
795 
796 /**
797  * change_active_interface - change the active slave into the specified one
798  * @bond: our bonding struct
799  * @new: the new slave to make the active one
800  *
801  * Set the new slave to the bond's settings and unset them on the old
802  * curr_active_slave.
803  * Setting include flags, mc-list, promiscuity, allmulti, etc.
804  *
805  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
806  * because it is apparently the best available slave we have, even though its
807  * updelay hasn't timed out yet.
808  *
809  * Caller must hold RTNL.
810  */
811 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
812 {
813 	struct slave *old_active;
814 
815 	ASSERT_RTNL();
816 
817 	old_active = rtnl_dereference(bond->curr_active_slave);
818 
819 	if (old_active == new_active)
820 		return;
821 
822 	if (new_active) {
823 		new_active->last_link_up = jiffies;
824 
825 		if (new_active->link == BOND_LINK_BACK) {
826 			if (bond_uses_primary(bond)) {
827 				netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
828 					    new_active->dev->name,
829 					    (bond->params.updelay - new_active->delay) * bond->params.miimon);
830 			}
831 
832 			new_active->delay = 0;
833 			bond_set_slave_link_state(new_active, BOND_LINK_UP);
834 
835 			if (BOND_MODE(bond) == BOND_MODE_8023AD)
836 				bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
837 
838 			if (bond_is_lb(bond))
839 				bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
840 		} else {
841 			if (bond_uses_primary(bond)) {
842 				netdev_info(bond->dev, "making interface %s the new active one\n",
843 					    new_active->dev->name);
844 			}
845 		}
846 	}
847 
848 	if (bond_uses_primary(bond))
849 		bond_hw_addr_swap(bond, new_active, old_active);
850 
851 	if (bond_is_lb(bond)) {
852 		bond_alb_handle_active_change(bond, new_active);
853 		if (old_active)
854 			bond_set_slave_inactive_flags(old_active,
855 						      BOND_SLAVE_NOTIFY_NOW);
856 		if (new_active)
857 			bond_set_slave_active_flags(new_active,
858 						    BOND_SLAVE_NOTIFY_NOW);
859 	} else {
860 		rcu_assign_pointer(bond->curr_active_slave, new_active);
861 	}
862 
863 	if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
864 		if (old_active)
865 			bond_set_slave_inactive_flags(old_active,
866 						      BOND_SLAVE_NOTIFY_NOW);
867 
868 		if (new_active) {
869 			bool should_notify_peers = false;
870 
871 			bond_set_slave_active_flags(new_active,
872 						    BOND_SLAVE_NOTIFY_NOW);
873 
874 			if (bond->params.fail_over_mac)
875 				bond_do_fail_over_mac(bond, new_active,
876 						      old_active);
877 
878 			if (netif_running(bond->dev)) {
879 				bond->send_peer_notif =
880 					bond->params.num_peer_notif;
881 				should_notify_peers =
882 					bond_should_notify_peers(bond);
883 			}
884 
885 			call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
886 			if (should_notify_peers)
887 				call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
888 							 bond->dev);
889 		}
890 	}
891 
892 	/* resend IGMP joins since active slave has changed or
893 	 * all were sent on curr_active_slave.
894 	 * resend only if bond is brought up with the affected
895 	 * bonding modes and the retransmission is enabled
896 	 */
897 	if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
898 	    ((bond_uses_primary(bond) && new_active) ||
899 	     BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
900 		bond->igmp_retrans = bond->params.resend_igmp;
901 		queue_delayed_work(bond->wq, &bond->mcast_work, 1);
902 	}
903 }
904 
905 /**
906  * bond_select_active_slave - select a new active slave, if needed
907  * @bond: our bonding struct
908  *
909  * This functions should be called when one of the following occurs:
910  * - The old curr_active_slave has been released or lost its link.
911  * - The primary_slave has got its link back.
912  * - A slave has got its link back and there's no old curr_active_slave.
913  *
914  * Caller must hold RTNL.
915  */
916 void bond_select_active_slave(struct bonding *bond)
917 {
918 	struct slave *best_slave;
919 	int rv;
920 
921 	ASSERT_RTNL();
922 
923 	best_slave = bond_find_best_slave(bond);
924 	if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
925 		bond_change_active_slave(bond, best_slave);
926 		rv = bond_set_carrier(bond);
927 		if (!rv)
928 			return;
929 
930 		if (netif_carrier_ok(bond->dev)) {
931 			netdev_info(bond->dev, "first active interface up!\n");
932 		} else {
933 			netdev_info(bond->dev, "now running without any active interface!\n");
934 		}
935 	}
936 }
937 
938 #ifdef CONFIG_NET_POLL_CONTROLLER
939 static inline int slave_enable_netpoll(struct slave *slave)
940 {
941 	struct netpoll *np;
942 	int err = 0;
943 
944 	np = kzalloc(sizeof(*np), GFP_KERNEL);
945 	err = -ENOMEM;
946 	if (!np)
947 		goto out;
948 
949 	err = __netpoll_setup(np, slave->dev);
950 	if (err) {
951 		kfree(np);
952 		goto out;
953 	}
954 	slave->np = np;
955 out:
956 	return err;
957 }
958 static inline void slave_disable_netpoll(struct slave *slave)
959 {
960 	struct netpoll *np = slave->np;
961 
962 	if (!np)
963 		return;
964 
965 	slave->np = NULL;
966 	__netpoll_free_async(np);
967 }
968 
969 static void bond_poll_controller(struct net_device *bond_dev)
970 {
971 	struct bonding *bond = netdev_priv(bond_dev);
972 	struct slave *slave = NULL;
973 	struct list_head *iter;
974 	struct ad_info ad_info;
975 	struct netpoll_info *ni;
976 	const struct net_device_ops *ops;
977 
978 	if (BOND_MODE(bond) == BOND_MODE_8023AD)
979 		if (bond_3ad_get_active_agg_info(bond, &ad_info))
980 			return;
981 
982 	rcu_read_lock_bh();
983 	bond_for_each_slave_rcu(bond, slave, iter) {
984 		ops = slave->dev->netdev_ops;
985 		if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
986 			continue;
987 
988 		if (BOND_MODE(bond) == BOND_MODE_8023AD) {
989 			struct aggregator *agg =
990 			    SLAVE_AD_INFO(slave)->port.aggregator;
991 
992 			if (agg &&
993 			    agg->aggregator_identifier != ad_info.aggregator_id)
994 				continue;
995 		}
996 
997 		ni = rcu_dereference_bh(slave->dev->npinfo);
998 		if (down_trylock(&ni->dev_lock))
999 			continue;
1000 		ops->ndo_poll_controller(slave->dev);
1001 		up(&ni->dev_lock);
1002 	}
1003 	rcu_read_unlock_bh();
1004 }
1005 
1006 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1007 {
1008 	struct bonding *bond = netdev_priv(bond_dev);
1009 	struct list_head *iter;
1010 	struct slave *slave;
1011 
1012 	bond_for_each_slave(bond, slave, iter)
1013 		if (bond_slave_is_up(slave))
1014 			slave_disable_netpoll(slave);
1015 }
1016 
1017 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1018 {
1019 	struct bonding *bond = netdev_priv(dev);
1020 	struct list_head *iter;
1021 	struct slave *slave;
1022 	int err = 0;
1023 
1024 	bond_for_each_slave(bond, slave, iter) {
1025 		err = slave_enable_netpoll(slave);
1026 		if (err) {
1027 			bond_netpoll_cleanup(dev);
1028 			break;
1029 		}
1030 	}
1031 	return err;
1032 }
1033 #else
1034 static inline int slave_enable_netpoll(struct slave *slave)
1035 {
1036 	return 0;
1037 }
1038 static inline void slave_disable_netpoll(struct slave *slave)
1039 {
1040 }
1041 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1042 {
1043 }
1044 #endif
1045 
1046 /*---------------------------------- IOCTL ----------------------------------*/
1047 
1048 static netdev_features_t bond_fix_features(struct net_device *dev,
1049 					   netdev_features_t features)
1050 {
1051 	struct bonding *bond = netdev_priv(dev);
1052 	struct list_head *iter;
1053 	netdev_features_t mask;
1054 	struct slave *slave;
1055 
1056 	mask = features;
1057 
1058 	features &= ~NETIF_F_ONE_FOR_ALL;
1059 	features |= NETIF_F_ALL_FOR_ALL;
1060 
1061 	bond_for_each_slave(bond, slave, iter) {
1062 		features = netdev_increment_features(features,
1063 						     slave->dev->features,
1064 						     mask);
1065 	}
1066 	features = netdev_add_tso_features(features, mask);
1067 
1068 	return features;
1069 }
1070 
1071 #define BOND_VLAN_FEATURES	(NETIF_F_ALL_CSUM | NETIF_F_SG | \
1072 				 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1073 				 NETIF_F_HIGHDMA | NETIF_F_LRO)
1074 
1075 #define BOND_ENC_FEATURES	(NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\
1076 				 NETIF_F_TSO)
1077 
1078 static void bond_compute_features(struct bonding *bond)
1079 {
1080 	unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1081 					IFF_XMIT_DST_RELEASE_PERM;
1082 	netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1083 	netdev_features_t enc_features  = BOND_ENC_FEATURES;
1084 	struct net_device *bond_dev = bond->dev;
1085 	struct list_head *iter;
1086 	struct slave *slave;
1087 	unsigned short max_hard_header_len = ETH_HLEN;
1088 	unsigned int gso_max_size = GSO_MAX_SIZE;
1089 	u16 gso_max_segs = GSO_MAX_SEGS;
1090 
1091 	if (!bond_has_slaves(bond))
1092 		goto done;
1093 	vlan_features &= NETIF_F_ALL_FOR_ALL;
1094 
1095 	bond_for_each_slave(bond, slave, iter) {
1096 		vlan_features = netdev_increment_features(vlan_features,
1097 			slave->dev->vlan_features, BOND_VLAN_FEATURES);
1098 
1099 		enc_features = netdev_increment_features(enc_features,
1100 							 slave->dev->hw_enc_features,
1101 							 BOND_ENC_FEATURES);
1102 		dst_release_flag &= slave->dev->priv_flags;
1103 		if (slave->dev->hard_header_len > max_hard_header_len)
1104 			max_hard_header_len = slave->dev->hard_header_len;
1105 
1106 		gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1107 		gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1108 	}
1109 
1110 done:
1111 	bond_dev->vlan_features = vlan_features;
1112 	bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1113 	bond_dev->hard_header_len = max_hard_header_len;
1114 	bond_dev->gso_max_segs = gso_max_segs;
1115 	netif_set_gso_max_size(bond_dev, gso_max_size);
1116 
1117 	bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1118 	if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1119 	    dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1120 		bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1121 
1122 	netdev_change_features(bond_dev);
1123 }
1124 
1125 static void bond_setup_by_slave(struct net_device *bond_dev,
1126 				struct net_device *slave_dev)
1127 {
1128 	bond_dev->header_ops	    = slave_dev->header_ops;
1129 
1130 	bond_dev->type		    = slave_dev->type;
1131 	bond_dev->hard_header_len   = slave_dev->hard_header_len;
1132 	bond_dev->addr_len	    = slave_dev->addr_len;
1133 
1134 	memcpy(bond_dev->broadcast, slave_dev->broadcast,
1135 		slave_dev->addr_len);
1136 }
1137 
1138 /* On bonding slaves other than the currently active slave, suppress
1139  * duplicates except for alb non-mcast/bcast.
1140  */
1141 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1142 					    struct slave *slave,
1143 					    struct bonding *bond)
1144 {
1145 	if (bond_is_slave_inactive(slave)) {
1146 		if (BOND_MODE(bond) == BOND_MODE_ALB &&
1147 		    skb->pkt_type != PACKET_BROADCAST &&
1148 		    skb->pkt_type != PACKET_MULTICAST)
1149 			return false;
1150 		return true;
1151 	}
1152 	return false;
1153 }
1154 
1155 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1156 {
1157 	struct sk_buff *skb = *pskb;
1158 	struct slave *slave;
1159 	struct bonding *bond;
1160 	int (*recv_probe)(const struct sk_buff *, struct bonding *,
1161 			  struct slave *);
1162 	int ret = RX_HANDLER_ANOTHER;
1163 
1164 	skb = skb_share_check(skb, GFP_ATOMIC);
1165 	if (unlikely(!skb))
1166 		return RX_HANDLER_CONSUMED;
1167 
1168 	*pskb = skb;
1169 
1170 	slave = bond_slave_get_rcu(skb->dev);
1171 	bond = slave->bond;
1172 
1173 	recv_probe = ACCESS_ONCE(bond->recv_probe);
1174 	if (recv_probe) {
1175 		ret = recv_probe(skb, bond, slave);
1176 		if (ret == RX_HANDLER_CONSUMED) {
1177 			consume_skb(skb);
1178 			return ret;
1179 		}
1180 	}
1181 
1182 	if (bond_should_deliver_exact_match(skb, slave, bond)) {
1183 		return RX_HANDLER_EXACT;
1184 	}
1185 
1186 	skb->dev = bond->dev;
1187 
1188 	if (BOND_MODE(bond) == BOND_MODE_ALB &&
1189 	    bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1190 	    skb->pkt_type == PACKET_HOST) {
1191 
1192 		if (unlikely(skb_cow_head(skb,
1193 					  skb->data - skb_mac_header(skb)))) {
1194 			kfree_skb(skb);
1195 			return RX_HANDLER_CONSUMED;
1196 		}
1197 		ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1198 	}
1199 
1200 	return ret;
1201 }
1202 
1203 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1204 				      struct net_device *slave_dev,
1205 				      struct slave *slave)
1206 {
1207 	int err;
1208 
1209 	err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1210 	if (err)
1211 		return err;
1212 	slave_dev->flags |= IFF_SLAVE;
1213 	rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1214 	return 0;
1215 }
1216 
1217 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1218 				  struct net_device *slave_dev)
1219 {
1220 	netdev_upper_dev_unlink(slave_dev, bond_dev);
1221 	slave_dev->flags &= ~IFF_SLAVE;
1222 	rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1223 }
1224 
1225 static struct slave *bond_alloc_slave(struct bonding *bond)
1226 {
1227 	struct slave *slave = NULL;
1228 
1229 	slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1230 	if (!slave)
1231 		return NULL;
1232 
1233 	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1234 		SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1235 					       GFP_KERNEL);
1236 		if (!SLAVE_AD_INFO(slave)) {
1237 			kfree(slave);
1238 			return NULL;
1239 		}
1240 	}
1241 	return slave;
1242 }
1243 
1244 static void bond_free_slave(struct slave *slave)
1245 {
1246 	struct bonding *bond = bond_get_bond_by_slave(slave);
1247 
1248 	if (BOND_MODE(bond) == BOND_MODE_8023AD)
1249 		kfree(SLAVE_AD_INFO(slave));
1250 
1251 	kfree(slave);
1252 }
1253 
1254 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1255 {
1256 	info->bond_mode = BOND_MODE(bond);
1257 	info->miimon = bond->params.miimon;
1258 	info->num_slaves = bond->slave_cnt;
1259 }
1260 
1261 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1262 {
1263 	strcpy(info->slave_name, slave->dev->name);
1264 	info->link = slave->link;
1265 	info->state = bond_slave_state(slave);
1266 	info->link_failure_count = slave->link_failure_count;
1267 }
1268 
1269 static void bond_netdev_notify(struct net_device *dev,
1270 			       struct netdev_bonding_info *info)
1271 {
1272 	rtnl_lock();
1273 	netdev_bonding_info_change(dev, info);
1274 	rtnl_unlock();
1275 }
1276 
1277 static void bond_netdev_notify_work(struct work_struct *_work)
1278 {
1279 	struct netdev_notify_work *w =
1280 		container_of(_work, struct netdev_notify_work, work.work);
1281 
1282 	bond_netdev_notify(w->dev, &w->bonding_info);
1283 	dev_put(w->dev);
1284 	kfree(w);
1285 }
1286 
1287 void bond_queue_slave_event(struct slave *slave)
1288 {
1289 	struct bonding *bond = slave->bond;
1290 	struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1291 
1292 	if (!nnw)
1293 		return;
1294 
1295 	dev_hold(slave->dev);
1296 	nnw->dev = slave->dev;
1297 	bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1298 	bond_fill_ifbond(bond, &nnw->bonding_info.master);
1299 	INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1300 
1301 	queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1302 }
1303 
1304 /* enslave device <slave> to bond device <master> */
1305 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1306 {
1307 	struct bonding *bond = netdev_priv(bond_dev);
1308 	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1309 	struct slave *new_slave = NULL, *prev_slave;
1310 	struct sockaddr addr;
1311 	int link_reporting;
1312 	int res = 0, i;
1313 
1314 	if (!bond->params.use_carrier &&
1315 	    slave_dev->ethtool_ops->get_link == NULL &&
1316 	    slave_ops->ndo_do_ioctl == NULL) {
1317 		netdev_warn(bond_dev, "no link monitoring support for %s\n",
1318 			    slave_dev->name);
1319 	}
1320 
1321 	/* already enslaved */
1322 	if (slave_dev->flags & IFF_SLAVE) {
1323 		netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1324 		return -EBUSY;
1325 	}
1326 
1327 	if (bond_dev == slave_dev) {
1328 		netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1329 		return -EPERM;
1330 	}
1331 
1332 	/* vlan challenged mutual exclusion */
1333 	/* no need to lock since we're protected by rtnl_lock */
1334 	if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1335 		netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1336 			   slave_dev->name);
1337 		if (vlan_uses_dev(bond_dev)) {
1338 			netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1339 				   slave_dev->name, bond_dev->name);
1340 			return -EPERM;
1341 		} else {
1342 			netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1343 				    slave_dev->name, slave_dev->name,
1344 				    bond_dev->name);
1345 		}
1346 	} else {
1347 		netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1348 			   slave_dev->name);
1349 	}
1350 
1351 	/* Old ifenslave binaries are no longer supported.  These can
1352 	 * be identified with moderate accuracy by the state of the slave:
1353 	 * the current ifenslave will set the interface down prior to
1354 	 * enslaving it; the old ifenslave will not.
1355 	 */
1356 	if ((slave_dev->flags & IFF_UP)) {
1357 		netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1358 			   slave_dev->name);
1359 		res = -EPERM;
1360 		goto err_undo_flags;
1361 	}
1362 
1363 	/* set bonding device ether type by slave - bonding netdevices are
1364 	 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1365 	 * there is a need to override some of the type dependent attribs/funcs.
1366 	 *
1367 	 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1368 	 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1369 	 */
1370 	if (!bond_has_slaves(bond)) {
1371 		if (bond_dev->type != slave_dev->type) {
1372 			netdev_dbg(bond_dev, "change device type from %d to %d\n",
1373 				   bond_dev->type, slave_dev->type);
1374 
1375 			res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1376 						       bond_dev);
1377 			res = notifier_to_errno(res);
1378 			if (res) {
1379 				netdev_err(bond_dev, "refused to change device type\n");
1380 				res = -EBUSY;
1381 				goto err_undo_flags;
1382 			}
1383 
1384 			/* Flush unicast and multicast addresses */
1385 			dev_uc_flush(bond_dev);
1386 			dev_mc_flush(bond_dev);
1387 
1388 			if (slave_dev->type != ARPHRD_ETHER)
1389 				bond_setup_by_slave(bond_dev, slave_dev);
1390 			else {
1391 				ether_setup(bond_dev);
1392 				bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1393 			}
1394 
1395 			call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1396 						 bond_dev);
1397 		}
1398 	} else if (bond_dev->type != slave_dev->type) {
1399 		netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1400 			   slave_dev->name, slave_dev->type, bond_dev->type);
1401 		res = -EINVAL;
1402 		goto err_undo_flags;
1403 	}
1404 
1405 	if (slave_ops->ndo_set_mac_address == NULL) {
1406 		netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1407 		if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1408 		    bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1409 			if (!bond_has_slaves(bond)) {
1410 				bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1411 				netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1412 			} else {
1413 				netdev_err(bond_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1414 				res = -EOPNOTSUPP;
1415 				goto err_undo_flags;
1416 			}
1417 		}
1418 	}
1419 
1420 	call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1421 
1422 	/* If this is the first slave, then we need to set the master's hardware
1423 	 * address to be the same as the slave's.
1424 	 */
1425 	if (!bond_has_slaves(bond) &&
1426 	    bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1427 		bond_set_dev_addr(bond->dev, slave_dev);
1428 
1429 	new_slave = bond_alloc_slave(bond);
1430 	if (!new_slave) {
1431 		res = -ENOMEM;
1432 		goto err_undo_flags;
1433 	}
1434 
1435 	new_slave->bond = bond;
1436 	new_slave->dev = slave_dev;
1437 	/* Set the new_slave's queue_id to be zero.  Queue ID mapping
1438 	 * is set via sysfs or module option if desired.
1439 	 */
1440 	new_slave->queue_id = 0;
1441 
1442 	/* Save slave's original mtu and then set it to match the bond */
1443 	new_slave->original_mtu = slave_dev->mtu;
1444 	res = dev_set_mtu(slave_dev, bond->dev->mtu);
1445 	if (res) {
1446 		netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1447 		goto err_free;
1448 	}
1449 
1450 	/* Save slave's original ("permanent") mac address for modes
1451 	 * that need it, and for restoring it upon release, and then
1452 	 * set it to the master's address
1453 	 */
1454 	ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1455 
1456 	if (!bond->params.fail_over_mac ||
1457 	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1458 		/* Set slave to master's mac address.  The application already
1459 		 * set the master's mac address to that of the first slave
1460 		 */
1461 		memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1462 		addr.sa_family = slave_dev->type;
1463 		res = dev_set_mac_address(slave_dev, &addr);
1464 		if (res) {
1465 			netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1466 			goto err_restore_mtu;
1467 		}
1468 	}
1469 
1470 	/* open the slave since the application closed it */
1471 	res = dev_open(slave_dev);
1472 	if (res) {
1473 		netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1474 		goto err_restore_mac;
1475 	}
1476 
1477 	slave_dev->priv_flags |= IFF_BONDING;
1478 	/* initialize slave stats */
1479 	dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1480 
1481 	if (bond_is_lb(bond)) {
1482 		/* bond_alb_init_slave() must be called before all other stages since
1483 		 * it might fail and we do not want to have to undo everything
1484 		 */
1485 		res = bond_alb_init_slave(bond, new_slave);
1486 		if (res)
1487 			goto err_close;
1488 	}
1489 
1490 	/* If the mode uses primary, then the following is handled by
1491 	 * bond_change_active_slave().
1492 	 */
1493 	if (!bond_uses_primary(bond)) {
1494 		/* set promiscuity level to new slave */
1495 		if (bond_dev->flags & IFF_PROMISC) {
1496 			res = dev_set_promiscuity(slave_dev, 1);
1497 			if (res)
1498 				goto err_close;
1499 		}
1500 
1501 		/* set allmulti level to new slave */
1502 		if (bond_dev->flags & IFF_ALLMULTI) {
1503 			res = dev_set_allmulti(slave_dev, 1);
1504 			if (res)
1505 				goto err_close;
1506 		}
1507 
1508 		netif_addr_lock_bh(bond_dev);
1509 
1510 		dev_mc_sync_multiple(slave_dev, bond_dev);
1511 		dev_uc_sync_multiple(slave_dev, bond_dev);
1512 
1513 		netif_addr_unlock_bh(bond_dev);
1514 	}
1515 
1516 	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1517 		/* add lacpdu mc addr to mc list */
1518 		u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1519 
1520 		dev_mc_add(slave_dev, lacpdu_multicast);
1521 	}
1522 
1523 	res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1524 	if (res) {
1525 		netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1526 			   slave_dev->name);
1527 		goto err_close;
1528 	}
1529 
1530 	prev_slave = bond_last_slave(bond);
1531 
1532 	new_slave->delay = 0;
1533 	new_slave->link_failure_count = 0;
1534 
1535 	bond_update_speed_duplex(new_slave);
1536 
1537 	new_slave->last_rx = jiffies -
1538 		(msecs_to_jiffies(bond->params.arp_interval) + 1);
1539 	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1540 		new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1541 
1542 	if (bond->params.miimon && !bond->params.use_carrier) {
1543 		link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1544 
1545 		if ((link_reporting == -1) && !bond->params.arp_interval) {
1546 			/* miimon is set but a bonded network driver
1547 			 * does not support ETHTOOL/MII and
1548 			 * arp_interval is not set.  Note: if
1549 			 * use_carrier is enabled, we will never go
1550 			 * here (because netif_carrier is always
1551 			 * supported); thus, we don't need to change
1552 			 * the messages for netif_carrier.
1553 			 */
1554 			netdev_warn(bond_dev, "MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n",
1555 				    slave_dev->name);
1556 		} else if (link_reporting == -1) {
1557 			/* unable get link status using mii/ethtool */
1558 			netdev_warn(bond_dev, "can't get link status from interface %s; 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",
1559 				    slave_dev->name);
1560 		}
1561 	}
1562 
1563 	/* check for initial state */
1564 	if (bond->params.miimon) {
1565 		if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1566 			if (bond->params.updelay) {
1567 				bond_set_slave_link_state(new_slave,
1568 							  BOND_LINK_BACK);
1569 				new_slave->delay = bond->params.updelay;
1570 			} else {
1571 				bond_set_slave_link_state(new_slave,
1572 							  BOND_LINK_UP);
1573 			}
1574 		} else {
1575 			bond_set_slave_link_state(new_slave, BOND_LINK_DOWN);
1576 		}
1577 	} else if (bond->params.arp_interval) {
1578 		bond_set_slave_link_state(new_slave,
1579 					  (netif_carrier_ok(slave_dev) ?
1580 					  BOND_LINK_UP : BOND_LINK_DOWN));
1581 	} else {
1582 		bond_set_slave_link_state(new_slave, BOND_LINK_UP);
1583 	}
1584 
1585 	if (new_slave->link != BOND_LINK_DOWN)
1586 		new_slave->last_link_up = jiffies;
1587 	netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1588 		   new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1589 		   (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1590 
1591 	if (bond_uses_primary(bond) && bond->params.primary[0]) {
1592 		/* if there is a primary slave, remember it */
1593 		if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1594 			rcu_assign_pointer(bond->primary_slave, new_slave);
1595 			bond->force_primary = true;
1596 		}
1597 	}
1598 
1599 	switch (BOND_MODE(bond)) {
1600 	case BOND_MODE_ACTIVEBACKUP:
1601 		bond_set_slave_inactive_flags(new_slave,
1602 					      BOND_SLAVE_NOTIFY_NOW);
1603 		break;
1604 	case BOND_MODE_8023AD:
1605 		/* in 802.3ad mode, the internal mechanism
1606 		 * will activate the slaves in the selected
1607 		 * aggregator
1608 		 */
1609 		bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1610 		/* if this is the first slave */
1611 		if (!prev_slave) {
1612 			SLAVE_AD_INFO(new_slave)->id = 1;
1613 			/* Initialize AD with the number of times that the AD timer is called in 1 second
1614 			 * can be called only after the mac address of the bond is set
1615 			 */
1616 			bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1617 		} else {
1618 			SLAVE_AD_INFO(new_slave)->id =
1619 				SLAVE_AD_INFO(prev_slave)->id + 1;
1620 		}
1621 
1622 		bond_3ad_bind_slave(new_slave);
1623 		break;
1624 	case BOND_MODE_TLB:
1625 	case BOND_MODE_ALB:
1626 		bond_set_active_slave(new_slave);
1627 		bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1628 		break;
1629 	default:
1630 		netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1631 
1632 		/* always active in trunk mode */
1633 		bond_set_active_slave(new_slave);
1634 
1635 		/* In trunking mode there is little meaning to curr_active_slave
1636 		 * anyway (it holds no special properties of the bond device),
1637 		 * so we can change it without calling change_active_interface()
1638 		 */
1639 		if (!rcu_access_pointer(bond->curr_active_slave) &&
1640 		    new_slave->link == BOND_LINK_UP)
1641 			rcu_assign_pointer(bond->curr_active_slave, new_slave);
1642 
1643 		break;
1644 	} /* switch(bond_mode) */
1645 
1646 #ifdef CONFIG_NET_POLL_CONTROLLER
1647 	slave_dev->npinfo = bond->dev->npinfo;
1648 	if (slave_dev->npinfo) {
1649 		if (slave_enable_netpoll(new_slave)) {
1650 			netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1651 			res = -EBUSY;
1652 			goto err_detach;
1653 		}
1654 	}
1655 #endif
1656 
1657 	if (!(bond_dev->features & NETIF_F_LRO))
1658 		dev_disable_lro(slave_dev);
1659 
1660 	res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1661 					 new_slave);
1662 	if (res) {
1663 		netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1664 		goto err_detach;
1665 	}
1666 
1667 	res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1668 	if (res) {
1669 		netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1670 		goto err_unregister;
1671 	}
1672 
1673 	res = bond_sysfs_slave_add(new_slave);
1674 	if (res) {
1675 		netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1676 		goto err_upper_unlink;
1677 	}
1678 
1679 	bond->slave_cnt++;
1680 	bond_compute_features(bond);
1681 	bond_set_carrier(bond);
1682 
1683 	if (bond_uses_primary(bond)) {
1684 		block_netpoll_tx();
1685 		bond_select_active_slave(bond);
1686 		unblock_netpoll_tx();
1687 	}
1688 
1689 	if (bond_mode_uses_xmit_hash(bond))
1690 		bond_update_slave_arr(bond, NULL);
1691 
1692 	netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1693 		    slave_dev->name,
1694 		    bond_is_active_slave(new_slave) ? "an active" : "a backup",
1695 		    new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1696 
1697 	/* enslave is successful */
1698 	bond_queue_slave_event(new_slave);
1699 	return 0;
1700 
1701 /* Undo stages on error */
1702 err_upper_unlink:
1703 	bond_upper_dev_unlink(bond_dev, slave_dev);
1704 
1705 err_unregister:
1706 	netdev_rx_handler_unregister(slave_dev);
1707 
1708 err_detach:
1709 	if (!bond_uses_primary(bond))
1710 		bond_hw_addr_flush(bond_dev, slave_dev);
1711 
1712 	vlan_vids_del_by_dev(slave_dev, bond_dev);
1713 	if (rcu_access_pointer(bond->primary_slave) == new_slave)
1714 		RCU_INIT_POINTER(bond->primary_slave, NULL);
1715 	if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1716 		block_netpoll_tx();
1717 		bond_change_active_slave(bond, NULL);
1718 		bond_select_active_slave(bond);
1719 		unblock_netpoll_tx();
1720 	}
1721 	/* either primary_slave or curr_active_slave might've changed */
1722 	synchronize_rcu();
1723 	slave_disable_netpoll(new_slave);
1724 
1725 err_close:
1726 	slave_dev->priv_flags &= ~IFF_BONDING;
1727 	dev_close(slave_dev);
1728 
1729 err_restore_mac:
1730 	if (!bond->params.fail_over_mac ||
1731 	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1732 		/* XXX TODO - fom follow mode needs to change master's
1733 		 * MAC if this slave's MAC is in use by the bond, or at
1734 		 * least print a warning.
1735 		 */
1736 		ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1737 		addr.sa_family = slave_dev->type;
1738 		dev_set_mac_address(slave_dev, &addr);
1739 	}
1740 
1741 err_restore_mtu:
1742 	dev_set_mtu(slave_dev, new_slave->original_mtu);
1743 
1744 err_free:
1745 	bond_free_slave(new_slave);
1746 
1747 err_undo_flags:
1748 	/* Enslave of first slave has failed and we need to fix master's mac */
1749 	if (!bond_has_slaves(bond)) {
1750 		if (ether_addr_equal_64bits(bond_dev->dev_addr,
1751 					    slave_dev->dev_addr))
1752 			eth_hw_addr_random(bond_dev);
1753 		if (bond_dev->type != ARPHRD_ETHER) {
1754 			ether_setup(bond_dev);
1755 			bond_dev->flags |= IFF_MASTER;
1756 			bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1757 		}
1758 	}
1759 
1760 	return res;
1761 }
1762 
1763 /* Try to release the slave device <slave> from the bond device <master>
1764  * It is legal to access curr_active_slave without a lock because all the function
1765  * is RTNL-locked. If "all" is true it means that the function is being called
1766  * while destroying a bond interface and all slaves are being released.
1767  *
1768  * The rules for slave state should be:
1769  *   for Active/Backup:
1770  *     Active stays on all backups go down
1771  *   for Bonded connections:
1772  *     The first up interface should be left on and all others downed.
1773  */
1774 static int __bond_release_one(struct net_device *bond_dev,
1775 			      struct net_device *slave_dev,
1776 			      bool all)
1777 {
1778 	struct bonding *bond = netdev_priv(bond_dev);
1779 	struct slave *slave, *oldcurrent;
1780 	struct sockaddr addr;
1781 	int old_flags = bond_dev->flags;
1782 	netdev_features_t old_features = bond_dev->features;
1783 
1784 	/* slave is not a slave or master is not master of this slave */
1785 	if (!(slave_dev->flags & IFF_SLAVE) ||
1786 	    !netdev_has_upper_dev(slave_dev, bond_dev)) {
1787 		netdev_dbg(bond_dev, "cannot release %s\n",
1788 			   slave_dev->name);
1789 		return -EINVAL;
1790 	}
1791 
1792 	block_netpoll_tx();
1793 
1794 	slave = bond_get_slave_by_dev(bond, slave_dev);
1795 	if (!slave) {
1796 		/* not a slave of this bond */
1797 		netdev_info(bond_dev, "%s not enslaved\n",
1798 			    slave_dev->name);
1799 		unblock_netpoll_tx();
1800 		return -EINVAL;
1801 	}
1802 
1803 	bond_sysfs_slave_del(slave);
1804 
1805 	/* recompute stats just before removing the slave */
1806 	bond_get_stats(bond->dev, &bond->bond_stats);
1807 
1808 	bond_upper_dev_unlink(bond_dev, slave_dev);
1809 	/* unregister rx_handler early so bond_handle_frame wouldn't be called
1810 	 * for this slave anymore.
1811 	 */
1812 	netdev_rx_handler_unregister(slave_dev);
1813 
1814 	if (BOND_MODE(bond) == BOND_MODE_8023AD)
1815 		bond_3ad_unbind_slave(slave);
1816 
1817 	if (bond_mode_uses_xmit_hash(bond))
1818 		bond_update_slave_arr(bond, slave);
1819 
1820 	netdev_info(bond_dev, "Releasing %s interface %s\n",
1821 		    bond_is_active_slave(slave) ? "active" : "backup",
1822 		    slave_dev->name);
1823 
1824 	oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1825 
1826 	RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1827 
1828 	if (!all && (!bond->params.fail_over_mac ||
1829 		     BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1830 		if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1831 		    bond_has_slaves(bond))
1832 			netdev_warn(bond_dev, "the permanent HWaddr of %s - %pM - is still in use by %s - set the HWaddr of %s to a different address to avoid conflicts\n",
1833 				    slave_dev->name, slave->perm_hwaddr,
1834 				    bond_dev->name, slave_dev->name);
1835 	}
1836 
1837 	if (rtnl_dereference(bond->primary_slave) == slave)
1838 		RCU_INIT_POINTER(bond->primary_slave, NULL);
1839 
1840 	if (oldcurrent == slave)
1841 		bond_change_active_slave(bond, NULL);
1842 
1843 	if (bond_is_lb(bond)) {
1844 		/* Must be called only after the slave has been
1845 		 * detached from the list and the curr_active_slave
1846 		 * has been cleared (if our_slave == old_current),
1847 		 * but before a new active slave is selected.
1848 		 */
1849 		bond_alb_deinit_slave(bond, slave);
1850 	}
1851 
1852 	if (all) {
1853 		RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1854 	} else if (oldcurrent == slave) {
1855 		/* Note that we hold RTNL over this sequence, so there
1856 		 * is no concern that another slave add/remove event
1857 		 * will interfere.
1858 		 */
1859 		bond_select_active_slave(bond);
1860 	}
1861 
1862 	if (!bond_has_slaves(bond)) {
1863 		bond_set_carrier(bond);
1864 		eth_hw_addr_random(bond_dev);
1865 	}
1866 
1867 	unblock_netpoll_tx();
1868 	synchronize_rcu();
1869 	bond->slave_cnt--;
1870 
1871 	if (!bond_has_slaves(bond)) {
1872 		call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1873 		call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1874 	}
1875 
1876 	bond_compute_features(bond);
1877 	if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1878 	    (old_features & NETIF_F_VLAN_CHALLENGED))
1879 		netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1880 			    slave_dev->name, bond_dev->name);
1881 
1882 	vlan_vids_del_by_dev(slave_dev, bond_dev);
1883 
1884 	/* If the mode uses primary, then this case was handled above by
1885 	 * bond_change_active_slave(..., NULL)
1886 	 */
1887 	if (!bond_uses_primary(bond)) {
1888 		/* unset promiscuity level from slave
1889 		 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1890 		 * of the IFF_PROMISC flag in the bond_dev, but we need the
1891 		 * value of that flag before that change, as that was the value
1892 		 * when this slave was attached, so we cache at the start of the
1893 		 * function and use it here. Same goes for ALLMULTI below
1894 		 */
1895 		if (old_flags & IFF_PROMISC)
1896 			dev_set_promiscuity(slave_dev, -1);
1897 
1898 		/* unset allmulti level from slave */
1899 		if (old_flags & IFF_ALLMULTI)
1900 			dev_set_allmulti(slave_dev, -1);
1901 
1902 		bond_hw_addr_flush(bond_dev, slave_dev);
1903 	}
1904 
1905 	slave_disable_netpoll(slave);
1906 
1907 	/* close slave before restoring its mac address */
1908 	dev_close(slave_dev);
1909 
1910 	if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1911 	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1912 		/* restore original ("permanent") mac address */
1913 		ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1914 		addr.sa_family = slave_dev->type;
1915 		dev_set_mac_address(slave_dev, &addr);
1916 	}
1917 
1918 	dev_set_mtu(slave_dev, slave->original_mtu);
1919 
1920 	slave_dev->priv_flags &= ~IFF_BONDING;
1921 
1922 	bond_free_slave(slave);
1923 
1924 	return 0;
1925 }
1926 
1927 /* A wrapper used because of ndo_del_link */
1928 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1929 {
1930 	return __bond_release_one(bond_dev, slave_dev, false);
1931 }
1932 
1933 /* First release a slave and then destroy the bond if no more slaves are left.
1934  * Must be under rtnl_lock when this function is called.
1935  */
1936 static int  bond_release_and_destroy(struct net_device *bond_dev,
1937 				     struct net_device *slave_dev)
1938 {
1939 	struct bonding *bond = netdev_priv(bond_dev);
1940 	int ret;
1941 
1942 	ret = bond_release(bond_dev, slave_dev);
1943 	if (ret == 0 && !bond_has_slaves(bond)) {
1944 		bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1945 		netdev_info(bond_dev, "Destroying bond %s\n",
1946 			    bond_dev->name);
1947 		bond_remove_proc_entry(bond);
1948 		unregister_netdevice(bond_dev);
1949 	}
1950 	return ret;
1951 }
1952 
1953 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1954 {
1955 	struct bonding *bond = netdev_priv(bond_dev);
1956 	bond_fill_ifbond(bond, info);
1957 	return 0;
1958 }
1959 
1960 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1961 {
1962 	struct bonding *bond = netdev_priv(bond_dev);
1963 	struct list_head *iter;
1964 	int i = 0, res = -ENODEV;
1965 	struct slave *slave;
1966 
1967 	bond_for_each_slave(bond, slave, iter) {
1968 		if (i++ == (int)info->slave_id) {
1969 			res = 0;
1970 			bond_fill_ifslave(slave, info);
1971 			break;
1972 		}
1973 	}
1974 
1975 	return res;
1976 }
1977 
1978 /*-------------------------------- Monitoring -------------------------------*/
1979 
1980 /* called with rcu_read_lock() */
1981 static int bond_miimon_inspect(struct bonding *bond)
1982 {
1983 	int link_state, commit = 0;
1984 	struct list_head *iter;
1985 	struct slave *slave;
1986 	bool ignore_updelay;
1987 
1988 	ignore_updelay = !rcu_dereference(bond->curr_active_slave);
1989 
1990 	bond_for_each_slave_rcu(bond, slave, iter) {
1991 		slave->new_link = BOND_LINK_NOCHANGE;
1992 
1993 		link_state = bond_check_dev_link(bond, slave->dev, 0);
1994 
1995 		switch (slave->link) {
1996 		case BOND_LINK_UP:
1997 			if (link_state)
1998 				continue;
1999 
2000 			bond_set_slave_link_state(slave, BOND_LINK_FAIL);
2001 			slave->delay = bond->params.downdelay;
2002 			if (slave->delay) {
2003 				netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2004 					    (BOND_MODE(bond) ==
2005 					     BOND_MODE_ACTIVEBACKUP) ?
2006 					     (bond_is_active_slave(slave) ?
2007 					      "active " : "backup ") : "",
2008 					    slave->dev->name,
2009 					    bond->params.downdelay * bond->params.miimon);
2010 			}
2011 			/*FALLTHRU*/
2012 		case BOND_LINK_FAIL:
2013 			if (link_state) {
2014 				/* recovered before downdelay expired */
2015 				bond_set_slave_link_state(slave, BOND_LINK_UP);
2016 				slave->last_link_up = jiffies;
2017 				netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2018 					    (bond->params.downdelay - slave->delay) *
2019 					    bond->params.miimon,
2020 					    slave->dev->name);
2021 				continue;
2022 			}
2023 
2024 			if (slave->delay <= 0) {
2025 				slave->new_link = BOND_LINK_DOWN;
2026 				commit++;
2027 				continue;
2028 			}
2029 
2030 			slave->delay--;
2031 			break;
2032 
2033 		case BOND_LINK_DOWN:
2034 			if (!link_state)
2035 				continue;
2036 
2037 			bond_set_slave_link_state(slave, BOND_LINK_BACK);
2038 			slave->delay = bond->params.updelay;
2039 
2040 			if (slave->delay) {
2041 				netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2042 					    slave->dev->name,
2043 					    ignore_updelay ? 0 :
2044 					    bond->params.updelay *
2045 					    bond->params.miimon);
2046 			}
2047 			/*FALLTHRU*/
2048 		case BOND_LINK_BACK:
2049 			if (!link_state) {
2050 				bond_set_slave_link_state(slave,
2051 							  BOND_LINK_DOWN);
2052 				netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2053 					    (bond->params.updelay - slave->delay) *
2054 					    bond->params.miimon,
2055 					    slave->dev->name);
2056 
2057 				continue;
2058 			}
2059 
2060 			if (ignore_updelay)
2061 				slave->delay = 0;
2062 
2063 			if (slave->delay <= 0) {
2064 				slave->new_link = BOND_LINK_UP;
2065 				commit++;
2066 				ignore_updelay = false;
2067 				continue;
2068 			}
2069 
2070 			slave->delay--;
2071 			break;
2072 		}
2073 	}
2074 
2075 	return commit;
2076 }
2077 
2078 static void bond_miimon_commit(struct bonding *bond)
2079 {
2080 	struct list_head *iter;
2081 	struct slave *slave, *primary;
2082 
2083 	bond_for_each_slave(bond, slave, iter) {
2084 		switch (slave->new_link) {
2085 		case BOND_LINK_NOCHANGE:
2086 			continue;
2087 
2088 		case BOND_LINK_UP:
2089 			bond_set_slave_link_state(slave, BOND_LINK_UP);
2090 			slave->last_link_up = jiffies;
2091 
2092 			primary = rtnl_dereference(bond->primary_slave);
2093 			if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2094 				/* prevent it from being the active one */
2095 				bond_set_backup_slave(slave);
2096 			} else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2097 				/* make it immediately active */
2098 				bond_set_active_slave(slave);
2099 			} else if (slave != primary) {
2100 				/* prevent it from being the active one */
2101 				bond_set_backup_slave(slave);
2102 			}
2103 
2104 			netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2105 				    slave->dev->name,
2106 				    slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2107 				    slave->duplex ? "full" : "half");
2108 
2109 			/* notify ad that the link status has changed */
2110 			if (BOND_MODE(bond) == BOND_MODE_8023AD)
2111 				bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2112 
2113 			if (bond_is_lb(bond))
2114 				bond_alb_handle_link_change(bond, slave,
2115 							    BOND_LINK_UP);
2116 
2117 			if (BOND_MODE(bond) == BOND_MODE_XOR)
2118 				bond_update_slave_arr(bond, NULL);
2119 
2120 			if (!bond->curr_active_slave || slave == primary)
2121 				goto do_failover;
2122 
2123 			continue;
2124 
2125 		case BOND_LINK_DOWN:
2126 			if (slave->link_failure_count < UINT_MAX)
2127 				slave->link_failure_count++;
2128 
2129 			bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2130 
2131 			if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2132 			    BOND_MODE(bond) == BOND_MODE_8023AD)
2133 				bond_set_slave_inactive_flags(slave,
2134 							      BOND_SLAVE_NOTIFY_NOW);
2135 
2136 			netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2137 				    slave->dev->name);
2138 
2139 			if (BOND_MODE(bond) == BOND_MODE_8023AD)
2140 				bond_3ad_handle_link_change(slave,
2141 							    BOND_LINK_DOWN);
2142 
2143 			if (bond_is_lb(bond))
2144 				bond_alb_handle_link_change(bond, slave,
2145 							    BOND_LINK_DOWN);
2146 
2147 			if (BOND_MODE(bond) == BOND_MODE_XOR)
2148 				bond_update_slave_arr(bond, NULL);
2149 
2150 			if (slave == rcu_access_pointer(bond->curr_active_slave))
2151 				goto do_failover;
2152 
2153 			continue;
2154 
2155 		default:
2156 			netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2157 				   slave->new_link, slave->dev->name);
2158 			slave->new_link = BOND_LINK_NOCHANGE;
2159 
2160 			continue;
2161 		}
2162 
2163 do_failover:
2164 		block_netpoll_tx();
2165 		bond_select_active_slave(bond);
2166 		unblock_netpoll_tx();
2167 	}
2168 
2169 	bond_set_carrier(bond);
2170 }
2171 
2172 /* bond_mii_monitor
2173  *
2174  * Really a wrapper that splits the mii monitor into two phases: an
2175  * inspection, then (if inspection indicates something needs to be done)
2176  * an acquisition of appropriate locks followed by a commit phase to
2177  * implement whatever link state changes are indicated.
2178  */
2179 static void bond_mii_monitor(struct work_struct *work)
2180 {
2181 	struct bonding *bond = container_of(work, struct bonding,
2182 					    mii_work.work);
2183 	bool should_notify_peers = false;
2184 	unsigned long delay;
2185 
2186 	delay = msecs_to_jiffies(bond->params.miimon);
2187 
2188 	if (!bond_has_slaves(bond))
2189 		goto re_arm;
2190 
2191 	rcu_read_lock();
2192 
2193 	should_notify_peers = bond_should_notify_peers(bond);
2194 
2195 	if (bond_miimon_inspect(bond)) {
2196 		rcu_read_unlock();
2197 
2198 		/* Race avoidance with bond_close cancel of workqueue */
2199 		if (!rtnl_trylock()) {
2200 			delay = 1;
2201 			should_notify_peers = false;
2202 			goto re_arm;
2203 		}
2204 
2205 		bond_miimon_commit(bond);
2206 
2207 		rtnl_unlock();	/* might sleep, hold no other locks */
2208 	} else
2209 		rcu_read_unlock();
2210 
2211 re_arm:
2212 	if (bond->params.miimon)
2213 		queue_delayed_work(bond->wq, &bond->mii_work, delay);
2214 
2215 	if (should_notify_peers) {
2216 		if (!rtnl_trylock())
2217 			return;
2218 		call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2219 		rtnl_unlock();
2220 	}
2221 }
2222 
2223 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2224 {
2225 	struct net_device *upper;
2226 	struct list_head *iter;
2227 	bool ret = false;
2228 
2229 	if (ip == bond_confirm_addr(bond->dev, 0, ip))
2230 		return true;
2231 
2232 	rcu_read_lock();
2233 	netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2234 		if (ip == bond_confirm_addr(upper, 0, ip)) {
2235 			ret = true;
2236 			break;
2237 		}
2238 	}
2239 	rcu_read_unlock();
2240 
2241 	return ret;
2242 }
2243 
2244 /* We go to the (large) trouble of VLAN tagging ARP frames because
2245  * switches in VLAN mode (especially if ports are configured as
2246  * "native" to a VLAN) might not pass non-tagged frames.
2247  */
2248 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2249 			  __be32 dest_ip, __be32 src_ip,
2250 			  struct bond_vlan_tag *tags)
2251 {
2252 	struct sk_buff *skb;
2253 	struct bond_vlan_tag *outer_tag = tags;
2254 
2255 	netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2256 		   arp_op, slave_dev->name, &dest_ip, &src_ip);
2257 
2258 	skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2259 			 NULL, slave_dev->dev_addr, NULL);
2260 
2261 	if (!skb) {
2262 		net_err_ratelimited("ARP packet allocation failed\n");
2263 		return;
2264 	}
2265 
2266 	if (!tags || tags->vlan_proto == VLAN_N_VID)
2267 		goto xmit;
2268 
2269 	tags++;
2270 
2271 	/* Go through all the tags backwards and add them to the packet */
2272 	while (tags->vlan_proto != VLAN_N_VID) {
2273 		if (!tags->vlan_id) {
2274 			tags++;
2275 			continue;
2276 		}
2277 
2278 		netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2279 			   ntohs(outer_tag->vlan_proto), tags->vlan_id);
2280 		skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2281 						tags->vlan_id);
2282 		if (!skb) {
2283 			net_err_ratelimited("failed to insert inner VLAN tag\n");
2284 			return;
2285 		}
2286 
2287 		tags++;
2288 	}
2289 	/* Set the outer tag */
2290 	if (outer_tag->vlan_id) {
2291 		netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2292 			   ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2293 		__vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2294 				       outer_tag->vlan_id);
2295 	}
2296 
2297 xmit:
2298 	arp_xmit(skb);
2299 }
2300 
2301 /* Validate the device path between the @start_dev and the @end_dev.
2302  * The path is valid if the @end_dev is reachable through device
2303  * stacking.
2304  * When the path is validated, collect any vlan information in the
2305  * path.
2306  */
2307 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2308 					      struct net_device *end_dev,
2309 					      int level)
2310 {
2311 	struct bond_vlan_tag *tags;
2312 	struct net_device *upper;
2313 	struct list_head  *iter;
2314 
2315 	if (start_dev == end_dev) {
2316 		tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2317 		if (!tags)
2318 			return ERR_PTR(-ENOMEM);
2319 		tags[level].vlan_proto = VLAN_N_VID;
2320 		return tags;
2321 	}
2322 
2323 	netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2324 		tags = bond_verify_device_path(upper, end_dev, level + 1);
2325 		if (IS_ERR_OR_NULL(tags)) {
2326 			if (IS_ERR(tags))
2327 				return tags;
2328 			continue;
2329 		}
2330 		if (is_vlan_dev(upper)) {
2331 			tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2332 			tags[level].vlan_id = vlan_dev_vlan_id(upper);
2333 		}
2334 
2335 		return tags;
2336 	}
2337 
2338 	return NULL;
2339 }
2340 
2341 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2342 {
2343 	struct rtable *rt;
2344 	struct bond_vlan_tag *tags;
2345 	__be32 *targets = bond->params.arp_targets, addr;
2346 	int i;
2347 
2348 	for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2349 		netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2350 		tags = NULL;
2351 
2352 		/* Find out through which dev should the packet go */
2353 		rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2354 				     RTO_ONLINK, 0);
2355 		if (IS_ERR(rt)) {
2356 			/* there's no route to target - try to send arp
2357 			 * probe to generate any traffic (arp_validate=0)
2358 			 */
2359 			if (bond->params.arp_validate)
2360 				net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2361 						     bond->dev->name,
2362 						     &targets[i]);
2363 			bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2364 				      0, tags);
2365 			continue;
2366 		}
2367 
2368 		/* bond device itself */
2369 		if (rt->dst.dev == bond->dev)
2370 			goto found;
2371 
2372 		rcu_read_lock();
2373 		tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2374 		rcu_read_unlock();
2375 
2376 		if (!IS_ERR_OR_NULL(tags))
2377 			goto found;
2378 
2379 		/* Not our device - skip */
2380 		netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2381 			   &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2382 
2383 		ip_rt_put(rt);
2384 		continue;
2385 
2386 found:
2387 		addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2388 		ip_rt_put(rt);
2389 		bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2390 			      addr, tags);
2391 		kfree(tags);
2392 	}
2393 }
2394 
2395 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2396 {
2397 	int i;
2398 
2399 	if (!sip || !bond_has_this_ip(bond, tip)) {
2400 		netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2401 			   &sip, &tip);
2402 		return;
2403 	}
2404 
2405 	i = bond_get_targets_ip(bond->params.arp_targets, sip);
2406 	if (i == -1) {
2407 		netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2408 			   &sip);
2409 		return;
2410 	}
2411 	slave->last_rx = jiffies;
2412 	slave->target_last_arp_rx[i] = jiffies;
2413 }
2414 
2415 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2416 		 struct slave *slave)
2417 {
2418 	struct arphdr *arp = (struct arphdr *)skb->data;
2419 	struct slave *curr_active_slave;
2420 	unsigned char *arp_ptr;
2421 	__be32 sip, tip;
2422 	int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2423 
2424 	if (!slave_do_arp_validate(bond, slave)) {
2425 		if ((slave_do_arp_validate_only(bond) && is_arp) ||
2426 		    !slave_do_arp_validate_only(bond))
2427 			slave->last_rx = jiffies;
2428 		return RX_HANDLER_ANOTHER;
2429 	} else if (!is_arp) {
2430 		return RX_HANDLER_ANOTHER;
2431 	}
2432 
2433 	alen = arp_hdr_len(bond->dev);
2434 
2435 	netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2436 		   skb->dev->name);
2437 
2438 	if (alen > skb_headlen(skb)) {
2439 		arp = kmalloc(alen, GFP_ATOMIC);
2440 		if (!arp)
2441 			goto out_unlock;
2442 		if (skb_copy_bits(skb, 0, arp, alen) < 0)
2443 			goto out_unlock;
2444 	}
2445 
2446 	if (arp->ar_hln != bond->dev->addr_len ||
2447 	    skb->pkt_type == PACKET_OTHERHOST ||
2448 	    skb->pkt_type == PACKET_LOOPBACK ||
2449 	    arp->ar_hrd != htons(ARPHRD_ETHER) ||
2450 	    arp->ar_pro != htons(ETH_P_IP) ||
2451 	    arp->ar_pln != 4)
2452 		goto out_unlock;
2453 
2454 	arp_ptr = (unsigned char *)(arp + 1);
2455 	arp_ptr += bond->dev->addr_len;
2456 	memcpy(&sip, arp_ptr, 4);
2457 	arp_ptr += 4 + bond->dev->addr_len;
2458 	memcpy(&tip, arp_ptr, 4);
2459 
2460 	netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2461 		   slave->dev->name, bond_slave_state(slave),
2462 		     bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2463 		     &sip, &tip);
2464 
2465 	curr_active_slave = rcu_dereference(bond->curr_active_slave);
2466 
2467 	/* Backup slaves won't see the ARP reply, but do come through
2468 	 * here for each ARP probe (so we swap the sip/tip to validate
2469 	 * the probe).  In a "redundant switch, common router" type of
2470 	 * configuration, the ARP probe will (hopefully) travel from
2471 	 * the active, through one switch, the router, then the other
2472 	 * switch before reaching the backup.
2473 	 *
2474 	 * We 'trust' the arp requests if there is an active slave and
2475 	 * it received valid arp reply(s) after it became active. This
2476 	 * is done to avoid endless looping when we can't reach the
2477 	 * arp_ip_target and fool ourselves with our own arp requests.
2478 	 */
2479 
2480 	if (bond_is_active_slave(slave))
2481 		bond_validate_arp(bond, slave, sip, tip);
2482 	else if (curr_active_slave &&
2483 		 time_after(slave_last_rx(bond, curr_active_slave),
2484 			    curr_active_slave->last_link_up))
2485 		bond_validate_arp(bond, slave, tip, sip);
2486 
2487 out_unlock:
2488 	if (arp != (struct arphdr *)skb->data)
2489 		kfree(arp);
2490 	return RX_HANDLER_ANOTHER;
2491 }
2492 
2493 /* function to verify if we're in the arp_interval timeslice, returns true if
2494  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2495  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2496  */
2497 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2498 				  int mod)
2499 {
2500 	int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2501 
2502 	return time_in_range(jiffies,
2503 			     last_act - delta_in_ticks,
2504 			     last_act + mod * delta_in_ticks + delta_in_ticks/2);
2505 }
2506 
2507 /* This function is called regularly to monitor each slave's link
2508  * ensuring that traffic is being sent and received when arp monitoring
2509  * is used in load-balancing mode. if the adapter has been dormant, then an
2510  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2511  * arp monitoring in active backup mode.
2512  */
2513 static void bond_loadbalance_arp_mon(struct work_struct *work)
2514 {
2515 	struct bonding *bond = container_of(work, struct bonding,
2516 					    arp_work.work);
2517 	struct slave *slave, *oldcurrent;
2518 	struct list_head *iter;
2519 	int do_failover = 0, slave_state_changed = 0;
2520 
2521 	if (!bond_has_slaves(bond))
2522 		goto re_arm;
2523 
2524 	rcu_read_lock();
2525 
2526 	oldcurrent = rcu_dereference(bond->curr_active_slave);
2527 	/* see if any of the previous devices are up now (i.e. they have
2528 	 * xmt and rcv traffic). the curr_active_slave does not come into
2529 	 * the picture unless it is null. also, slave->last_link_up is not
2530 	 * needed here because we send an arp on each slave and give a slave
2531 	 * as long as it needs to get the tx/rx within the delta.
2532 	 * TODO: what about up/down delay in arp mode? it wasn't here before
2533 	 *       so it can wait
2534 	 */
2535 	bond_for_each_slave_rcu(bond, slave, iter) {
2536 		unsigned long trans_start = dev_trans_start(slave->dev);
2537 
2538 		if (slave->link != BOND_LINK_UP) {
2539 			if (bond_time_in_interval(bond, trans_start, 1) &&
2540 			    bond_time_in_interval(bond, slave->last_rx, 1)) {
2541 
2542 				slave->link  = BOND_LINK_UP;
2543 				slave_state_changed = 1;
2544 
2545 				/* primary_slave has no meaning in round-robin
2546 				 * mode. the window of a slave being up and
2547 				 * curr_active_slave being null after enslaving
2548 				 * is closed.
2549 				 */
2550 				if (!oldcurrent) {
2551 					netdev_info(bond->dev, "link status definitely up for interface %s\n",
2552 						    slave->dev->name);
2553 					do_failover = 1;
2554 				} else {
2555 					netdev_info(bond->dev, "interface %s is now up\n",
2556 						    slave->dev->name);
2557 				}
2558 			}
2559 		} else {
2560 			/* slave->link == BOND_LINK_UP */
2561 
2562 			/* not all switches will respond to an arp request
2563 			 * when the source ip is 0, so don't take the link down
2564 			 * if we don't know our ip yet
2565 			 */
2566 			if (!bond_time_in_interval(bond, trans_start, 2) ||
2567 			    !bond_time_in_interval(bond, slave->last_rx, 2)) {
2568 
2569 				slave->link  = BOND_LINK_DOWN;
2570 				slave_state_changed = 1;
2571 
2572 				if (slave->link_failure_count < UINT_MAX)
2573 					slave->link_failure_count++;
2574 
2575 				netdev_info(bond->dev, "interface %s is now down\n",
2576 					    slave->dev->name);
2577 
2578 				if (slave == oldcurrent)
2579 					do_failover = 1;
2580 			}
2581 		}
2582 
2583 		/* note: if switch is in round-robin mode, all links
2584 		 * must tx arp to ensure all links rx an arp - otherwise
2585 		 * links may oscillate or not come up at all; if switch is
2586 		 * in something like xor mode, there is nothing we can
2587 		 * do - all replies will be rx'ed on same link causing slaves
2588 		 * to be unstable during low/no traffic periods
2589 		 */
2590 		if (bond_slave_is_up(slave))
2591 			bond_arp_send_all(bond, slave);
2592 	}
2593 
2594 	rcu_read_unlock();
2595 
2596 	if (do_failover || slave_state_changed) {
2597 		if (!rtnl_trylock())
2598 			goto re_arm;
2599 
2600 		if (slave_state_changed) {
2601 			bond_slave_state_change(bond);
2602 			if (BOND_MODE(bond) == BOND_MODE_XOR)
2603 				bond_update_slave_arr(bond, NULL);
2604 		}
2605 		if (do_failover) {
2606 			block_netpoll_tx();
2607 			bond_select_active_slave(bond);
2608 			unblock_netpoll_tx();
2609 		}
2610 		rtnl_unlock();
2611 	}
2612 
2613 re_arm:
2614 	if (bond->params.arp_interval)
2615 		queue_delayed_work(bond->wq, &bond->arp_work,
2616 				   msecs_to_jiffies(bond->params.arp_interval));
2617 }
2618 
2619 /* Called to inspect slaves for active-backup mode ARP monitor link state
2620  * changes.  Sets new_link in slaves to specify what action should take
2621  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2622  * to link states must be committed.
2623  *
2624  * Called with rcu_read_lock held.
2625  */
2626 static int bond_ab_arp_inspect(struct bonding *bond)
2627 {
2628 	unsigned long trans_start, last_rx;
2629 	struct list_head *iter;
2630 	struct slave *slave;
2631 	int commit = 0;
2632 
2633 	bond_for_each_slave_rcu(bond, slave, iter) {
2634 		slave->new_link = BOND_LINK_NOCHANGE;
2635 		last_rx = slave_last_rx(bond, slave);
2636 
2637 		if (slave->link != BOND_LINK_UP) {
2638 			if (bond_time_in_interval(bond, last_rx, 1)) {
2639 				slave->new_link = BOND_LINK_UP;
2640 				commit++;
2641 			}
2642 			continue;
2643 		}
2644 
2645 		/* Give slaves 2*delta after being enslaved or made
2646 		 * active.  This avoids bouncing, as the last receive
2647 		 * times need a full ARP monitor cycle to be updated.
2648 		 */
2649 		if (bond_time_in_interval(bond, slave->last_link_up, 2))
2650 			continue;
2651 
2652 		/* Backup slave is down if:
2653 		 * - No current_arp_slave AND
2654 		 * - more than 3*delta since last receive AND
2655 		 * - the bond has an IP address
2656 		 *
2657 		 * Note: a non-null current_arp_slave indicates
2658 		 * the curr_active_slave went down and we are
2659 		 * searching for a new one; under this condition
2660 		 * we only take the curr_active_slave down - this
2661 		 * gives each slave a chance to tx/rx traffic
2662 		 * before being taken out
2663 		 */
2664 		if (!bond_is_active_slave(slave) &&
2665 		    !rcu_access_pointer(bond->current_arp_slave) &&
2666 		    !bond_time_in_interval(bond, last_rx, 3)) {
2667 			slave->new_link = BOND_LINK_DOWN;
2668 			commit++;
2669 		}
2670 
2671 		/* Active slave is down if:
2672 		 * - more than 2*delta since transmitting OR
2673 		 * - (more than 2*delta since receive AND
2674 		 *    the bond has an IP address)
2675 		 */
2676 		trans_start = dev_trans_start(slave->dev);
2677 		if (bond_is_active_slave(slave) &&
2678 		    (!bond_time_in_interval(bond, trans_start, 2) ||
2679 		     !bond_time_in_interval(bond, last_rx, 2))) {
2680 			slave->new_link = BOND_LINK_DOWN;
2681 			commit++;
2682 		}
2683 	}
2684 
2685 	return commit;
2686 }
2687 
2688 /* Called to commit link state changes noted by inspection step of
2689  * active-backup mode ARP monitor.
2690  *
2691  * Called with RTNL hold.
2692  */
2693 static void bond_ab_arp_commit(struct bonding *bond)
2694 {
2695 	unsigned long trans_start;
2696 	struct list_head *iter;
2697 	struct slave *slave;
2698 
2699 	bond_for_each_slave(bond, slave, iter) {
2700 		switch (slave->new_link) {
2701 		case BOND_LINK_NOCHANGE:
2702 			continue;
2703 
2704 		case BOND_LINK_UP:
2705 			trans_start = dev_trans_start(slave->dev);
2706 			if (rtnl_dereference(bond->curr_active_slave) != slave ||
2707 			    (!rtnl_dereference(bond->curr_active_slave) &&
2708 			     bond_time_in_interval(bond, trans_start, 1))) {
2709 				struct slave *current_arp_slave;
2710 
2711 				current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2712 				bond_set_slave_link_state(slave, BOND_LINK_UP);
2713 				if (current_arp_slave) {
2714 					bond_set_slave_inactive_flags(
2715 						current_arp_slave,
2716 						BOND_SLAVE_NOTIFY_NOW);
2717 					RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2718 				}
2719 
2720 				netdev_info(bond->dev, "link status definitely up for interface %s\n",
2721 					    slave->dev->name);
2722 
2723 				if (!rtnl_dereference(bond->curr_active_slave) ||
2724 				    slave == rtnl_dereference(bond->primary_slave))
2725 					goto do_failover;
2726 
2727 			}
2728 
2729 			continue;
2730 
2731 		case BOND_LINK_DOWN:
2732 			if (slave->link_failure_count < UINT_MAX)
2733 				slave->link_failure_count++;
2734 
2735 			bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2736 			bond_set_slave_inactive_flags(slave,
2737 						      BOND_SLAVE_NOTIFY_NOW);
2738 
2739 			netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2740 				    slave->dev->name);
2741 
2742 			if (slave == rtnl_dereference(bond->curr_active_slave)) {
2743 				RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2744 				goto do_failover;
2745 			}
2746 
2747 			continue;
2748 
2749 		default:
2750 			netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2751 				   slave->new_link, slave->dev->name);
2752 			continue;
2753 		}
2754 
2755 do_failover:
2756 		block_netpoll_tx();
2757 		bond_select_active_slave(bond);
2758 		unblock_netpoll_tx();
2759 	}
2760 
2761 	bond_set_carrier(bond);
2762 }
2763 
2764 /* Send ARP probes for active-backup mode ARP monitor.
2765  *
2766  * Called with rcu_read_lock held.
2767  */
2768 static bool bond_ab_arp_probe(struct bonding *bond)
2769 {
2770 	struct slave *slave, *before = NULL, *new_slave = NULL,
2771 		     *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2772 		     *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2773 	struct list_head *iter;
2774 	bool found = false;
2775 	bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2776 
2777 	if (curr_arp_slave && curr_active_slave)
2778 		netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2779 			    curr_arp_slave->dev->name,
2780 			    curr_active_slave->dev->name);
2781 
2782 	if (curr_active_slave) {
2783 		bond_arp_send_all(bond, curr_active_slave);
2784 		return should_notify_rtnl;
2785 	}
2786 
2787 	/* if we don't have a curr_active_slave, search for the next available
2788 	 * backup slave from the current_arp_slave and make it the candidate
2789 	 * for becoming the curr_active_slave
2790 	 */
2791 
2792 	if (!curr_arp_slave) {
2793 		curr_arp_slave = bond_first_slave_rcu(bond);
2794 		if (!curr_arp_slave)
2795 			return should_notify_rtnl;
2796 	}
2797 
2798 	bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2799 
2800 	bond_for_each_slave_rcu(bond, slave, iter) {
2801 		if (!found && !before && bond_slave_is_up(slave))
2802 			before = slave;
2803 
2804 		if (found && !new_slave && bond_slave_is_up(slave))
2805 			new_slave = slave;
2806 		/* if the link state is up at this point, we
2807 		 * mark it down - this can happen if we have
2808 		 * simultaneous link failures and
2809 		 * reselect_active_interface doesn't make this
2810 		 * one the current slave so it is still marked
2811 		 * up when it is actually down
2812 		 */
2813 		if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2814 			bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2815 			if (slave->link_failure_count < UINT_MAX)
2816 				slave->link_failure_count++;
2817 
2818 			bond_set_slave_inactive_flags(slave,
2819 						      BOND_SLAVE_NOTIFY_LATER);
2820 
2821 			netdev_info(bond->dev, "backup interface %s is now down\n",
2822 				    slave->dev->name);
2823 		}
2824 		if (slave == curr_arp_slave)
2825 			found = true;
2826 	}
2827 
2828 	if (!new_slave && before)
2829 		new_slave = before;
2830 
2831 	if (!new_slave)
2832 		goto check_state;
2833 
2834 	bond_set_slave_link_state(new_slave, BOND_LINK_BACK);
2835 	bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2836 	bond_arp_send_all(bond, new_slave);
2837 	new_slave->last_link_up = jiffies;
2838 	rcu_assign_pointer(bond->current_arp_slave, new_slave);
2839 
2840 check_state:
2841 	bond_for_each_slave_rcu(bond, slave, iter) {
2842 		if (slave->should_notify) {
2843 			should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2844 			break;
2845 		}
2846 	}
2847 	return should_notify_rtnl;
2848 }
2849 
2850 static void bond_activebackup_arp_mon(struct work_struct *work)
2851 {
2852 	struct bonding *bond = container_of(work, struct bonding,
2853 					    arp_work.work);
2854 	bool should_notify_peers = false;
2855 	bool should_notify_rtnl = false;
2856 	int delta_in_ticks;
2857 
2858 	delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2859 
2860 	if (!bond_has_slaves(bond))
2861 		goto re_arm;
2862 
2863 	rcu_read_lock();
2864 
2865 	should_notify_peers = bond_should_notify_peers(bond);
2866 
2867 	if (bond_ab_arp_inspect(bond)) {
2868 		rcu_read_unlock();
2869 
2870 		/* Race avoidance with bond_close flush of workqueue */
2871 		if (!rtnl_trylock()) {
2872 			delta_in_ticks = 1;
2873 			should_notify_peers = false;
2874 			goto re_arm;
2875 		}
2876 
2877 		bond_ab_arp_commit(bond);
2878 
2879 		rtnl_unlock();
2880 		rcu_read_lock();
2881 	}
2882 
2883 	should_notify_rtnl = bond_ab_arp_probe(bond);
2884 	rcu_read_unlock();
2885 
2886 re_arm:
2887 	if (bond->params.arp_interval)
2888 		queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2889 
2890 	if (should_notify_peers || should_notify_rtnl) {
2891 		if (!rtnl_trylock())
2892 			return;
2893 
2894 		if (should_notify_peers)
2895 			call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2896 						 bond->dev);
2897 		if (should_notify_rtnl)
2898 			bond_slave_state_notify(bond);
2899 
2900 		rtnl_unlock();
2901 	}
2902 }
2903 
2904 /*-------------------------- netdev event handling --------------------------*/
2905 
2906 /* Change device name */
2907 static int bond_event_changename(struct bonding *bond)
2908 {
2909 	bond_remove_proc_entry(bond);
2910 	bond_create_proc_entry(bond);
2911 
2912 	bond_debug_reregister(bond);
2913 
2914 	return NOTIFY_DONE;
2915 }
2916 
2917 static int bond_master_netdev_event(unsigned long event,
2918 				    struct net_device *bond_dev)
2919 {
2920 	struct bonding *event_bond = netdev_priv(bond_dev);
2921 
2922 	switch (event) {
2923 	case NETDEV_CHANGENAME:
2924 		return bond_event_changename(event_bond);
2925 	case NETDEV_UNREGISTER:
2926 		bond_remove_proc_entry(event_bond);
2927 		break;
2928 	case NETDEV_REGISTER:
2929 		bond_create_proc_entry(event_bond);
2930 		break;
2931 	case NETDEV_NOTIFY_PEERS:
2932 		if (event_bond->send_peer_notif)
2933 			event_bond->send_peer_notif--;
2934 		break;
2935 	default:
2936 		break;
2937 	}
2938 
2939 	return NOTIFY_DONE;
2940 }
2941 
2942 static int bond_slave_netdev_event(unsigned long event,
2943 				   struct net_device *slave_dev)
2944 {
2945 	struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
2946 	struct bonding *bond;
2947 	struct net_device *bond_dev;
2948 	u32 old_speed;
2949 	u8 old_duplex;
2950 
2951 	/* A netdev event can be generated while enslaving a device
2952 	 * before netdev_rx_handler_register is called in which case
2953 	 * slave will be NULL
2954 	 */
2955 	if (!slave)
2956 		return NOTIFY_DONE;
2957 	bond_dev = slave->bond->dev;
2958 	bond = slave->bond;
2959 	primary = rtnl_dereference(bond->primary_slave);
2960 
2961 	switch (event) {
2962 	case NETDEV_UNREGISTER:
2963 		if (bond_dev->type != ARPHRD_ETHER)
2964 			bond_release_and_destroy(bond_dev, slave_dev);
2965 		else
2966 			bond_release(bond_dev, slave_dev);
2967 		break;
2968 	case NETDEV_UP:
2969 	case NETDEV_CHANGE:
2970 		old_speed = slave->speed;
2971 		old_duplex = slave->duplex;
2972 
2973 		bond_update_speed_duplex(slave);
2974 
2975 		if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2976 			if (old_speed != slave->speed)
2977 				bond_3ad_adapter_speed_changed(slave);
2978 			if (old_duplex != slave->duplex)
2979 				bond_3ad_adapter_duplex_changed(slave);
2980 		}
2981 		/* Fallthrough */
2982 	case NETDEV_DOWN:
2983 		/* Refresh slave-array if applicable!
2984 		 * If the setup does not use miimon or arpmon (mode-specific!),
2985 		 * then these events will not cause the slave-array to be
2986 		 * refreshed. This will cause xmit to use a slave that is not
2987 		 * usable. Avoid such situation by refeshing the array at these
2988 		 * events. If these (miimon/arpmon) parameters are configured
2989 		 * then array gets refreshed twice and that should be fine!
2990 		 */
2991 		if (bond_mode_uses_xmit_hash(bond))
2992 			bond_update_slave_arr(bond, NULL);
2993 		break;
2994 	case NETDEV_CHANGEMTU:
2995 		/* TODO: Should slaves be allowed to
2996 		 * independently alter their MTU?  For
2997 		 * an active-backup bond, slaves need
2998 		 * not be the same type of device, so
2999 		 * MTUs may vary.  For other modes,
3000 		 * slaves arguably should have the
3001 		 * same MTUs. To do this, we'd need to
3002 		 * take over the slave's change_mtu
3003 		 * function for the duration of their
3004 		 * servitude.
3005 		 */
3006 		break;
3007 	case NETDEV_CHANGENAME:
3008 		/* we don't care if we don't have primary set */
3009 		if (!bond_uses_primary(bond) ||
3010 		    !bond->params.primary[0])
3011 			break;
3012 
3013 		if (slave == primary) {
3014 			/* slave's name changed - he's no longer primary */
3015 			RCU_INIT_POINTER(bond->primary_slave, NULL);
3016 		} else if (!strcmp(slave_dev->name, bond->params.primary)) {
3017 			/* we have a new primary slave */
3018 			rcu_assign_pointer(bond->primary_slave, slave);
3019 		} else { /* we didn't change primary - exit */
3020 			break;
3021 		}
3022 
3023 		netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3024 			    primary ? slave_dev->name : "none");
3025 
3026 		block_netpoll_tx();
3027 		bond_select_active_slave(bond);
3028 		unblock_netpoll_tx();
3029 		break;
3030 	case NETDEV_FEAT_CHANGE:
3031 		bond_compute_features(bond);
3032 		break;
3033 	case NETDEV_RESEND_IGMP:
3034 		/* Propagate to master device */
3035 		call_netdevice_notifiers(event, slave->bond->dev);
3036 		break;
3037 	default:
3038 		break;
3039 	}
3040 
3041 	return NOTIFY_DONE;
3042 }
3043 
3044 /* bond_netdev_event: handle netdev notifier chain events.
3045  *
3046  * This function receives events for the netdev chain.  The caller (an
3047  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3048  * locks for us to safely manipulate the slave devices (RTNL lock,
3049  * dev_probe_lock).
3050  */
3051 static int bond_netdev_event(struct notifier_block *this,
3052 			     unsigned long event, void *ptr)
3053 {
3054 	struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3055 
3056 	netdev_dbg(event_dev, "event: %lx\n", event);
3057 
3058 	if (!(event_dev->priv_flags & IFF_BONDING))
3059 		return NOTIFY_DONE;
3060 
3061 	if (event_dev->flags & IFF_MASTER) {
3062 		netdev_dbg(event_dev, "IFF_MASTER\n");
3063 		return bond_master_netdev_event(event, event_dev);
3064 	}
3065 
3066 	if (event_dev->flags & IFF_SLAVE) {
3067 		netdev_dbg(event_dev, "IFF_SLAVE\n");
3068 		return bond_slave_netdev_event(event, event_dev);
3069 	}
3070 
3071 	return NOTIFY_DONE;
3072 }
3073 
3074 static struct notifier_block bond_netdev_notifier = {
3075 	.notifier_call = bond_netdev_event,
3076 };
3077 
3078 /*---------------------------- Hashing Policies -----------------------------*/
3079 
3080 /* L2 hash helper */
3081 static inline u32 bond_eth_hash(struct sk_buff *skb)
3082 {
3083 	struct ethhdr *ep, hdr_tmp;
3084 
3085 	ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3086 	if (ep)
3087 		return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3088 	return 0;
3089 }
3090 
3091 /* Extract the appropriate headers based on bond's xmit policy */
3092 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3093 			      struct flow_keys *fk)
3094 {
3095 	const struct ipv6hdr *iph6;
3096 	const struct iphdr *iph;
3097 	int noff, proto = -1;
3098 
3099 	if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3100 		return skb_flow_dissect_flow_keys(skb, fk);
3101 
3102 	fk->ports.ports = 0;
3103 	noff = skb_network_offset(skb);
3104 	if (skb->protocol == htons(ETH_P_IP)) {
3105 		if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3106 			return false;
3107 		iph = ip_hdr(skb);
3108 		iph_to_flow_copy_v4addrs(fk, iph);
3109 		noff += iph->ihl << 2;
3110 		if (!ip_is_fragment(iph))
3111 			proto = iph->protocol;
3112 	} else if (skb->protocol == htons(ETH_P_IPV6)) {
3113 		if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3114 			return false;
3115 		iph6 = ipv6_hdr(skb);
3116 		iph_to_flow_copy_v6addrs(fk, iph6);
3117 		noff += sizeof(*iph6);
3118 		proto = iph6->nexthdr;
3119 	} else {
3120 		return false;
3121 	}
3122 	if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3123 		fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3124 
3125 	return true;
3126 }
3127 
3128 /**
3129  * bond_xmit_hash - generate a hash value based on the xmit policy
3130  * @bond: bonding device
3131  * @skb: buffer to use for headers
3132  *
3133  * This function will extract the necessary headers from the skb buffer and use
3134  * them to generate a hash based on the xmit_policy set in the bonding device
3135  */
3136 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3137 {
3138 	struct flow_keys flow;
3139 	u32 hash;
3140 
3141 	if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3142 	    !bond_flow_dissect(bond, skb, &flow))
3143 		return bond_eth_hash(skb);
3144 
3145 	if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3146 	    bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3147 		hash = bond_eth_hash(skb);
3148 	else
3149 		hash = (__force u32)flow.ports.ports;
3150 	hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3151 		(__force u32)flow_get_u32_src(&flow);
3152 	hash ^= (hash >> 16);
3153 	hash ^= (hash >> 8);
3154 
3155 	return hash;
3156 }
3157 
3158 /*-------------------------- Device entry points ----------------------------*/
3159 
3160 static void bond_work_init_all(struct bonding *bond)
3161 {
3162 	INIT_DELAYED_WORK(&bond->mcast_work,
3163 			  bond_resend_igmp_join_requests_delayed);
3164 	INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3165 	INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3166 	if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3167 		INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3168 	else
3169 		INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3170 	INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3171 	INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3172 }
3173 
3174 static void bond_work_cancel_all(struct bonding *bond)
3175 {
3176 	cancel_delayed_work_sync(&bond->mii_work);
3177 	cancel_delayed_work_sync(&bond->arp_work);
3178 	cancel_delayed_work_sync(&bond->alb_work);
3179 	cancel_delayed_work_sync(&bond->ad_work);
3180 	cancel_delayed_work_sync(&bond->mcast_work);
3181 	cancel_delayed_work_sync(&bond->slave_arr_work);
3182 }
3183 
3184 static int bond_open(struct net_device *bond_dev)
3185 {
3186 	struct bonding *bond = netdev_priv(bond_dev);
3187 	struct list_head *iter;
3188 	struct slave *slave;
3189 
3190 	/* reset slave->backup and slave->inactive */
3191 	if (bond_has_slaves(bond)) {
3192 		bond_for_each_slave(bond, slave, iter) {
3193 			if (bond_uses_primary(bond) &&
3194 			    slave != rcu_access_pointer(bond->curr_active_slave)) {
3195 				bond_set_slave_inactive_flags(slave,
3196 							      BOND_SLAVE_NOTIFY_NOW);
3197 			} else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3198 				bond_set_slave_active_flags(slave,
3199 							    BOND_SLAVE_NOTIFY_NOW);
3200 			}
3201 		}
3202 	}
3203 
3204 	bond_work_init_all(bond);
3205 
3206 	if (bond_is_lb(bond)) {
3207 		/* bond_alb_initialize must be called before the timer
3208 		 * is started.
3209 		 */
3210 		if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3211 			return -ENOMEM;
3212 		if (bond->params.tlb_dynamic_lb)
3213 			queue_delayed_work(bond->wq, &bond->alb_work, 0);
3214 	}
3215 
3216 	if (bond->params.miimon)  /* link check interval, in milliseconds. */
3217 		queue_delayed_work(bond->wq, &bond->mii_work, 0);
3218 
3219 	if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3220 		queue_delayed_work(bond->wq, &bond->arp_work, 0);
3221 		bond->recv_probe = bond_arp_rcv;
3222 	}
3223 
3224 	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3225 		queue_delayed_work(bond->wq, &bond->ad_work, 0);
3226 		/* register to receive LACPDUs */
3227 		bond->recv_probe = bond_3ad_lacpdu_recv;
3228 		bond_3ad_initiate_agg_selection(bond, 1);
3229 	}
3230 
3231 	if (bond_mode_uses_xmit_hash(bond))
3232 		bond_update_slave_arr(bond, NULL);
3233 
3234 	return 0;
3235 }
3236 
3237 static int bond_close(struct net_device *bond_dev)
3238 {
3239 	struct bonding *bond = netdev_priv(bond_dev);
3240 
3241 	bond_work_cancel_all(bond);
3242 	bond->send_peer_notif = 0;
3243 	if (bond_is_lb(bond))
3244 		bond_alb_deinitialize(bond);
3245 	bond->recv_probe = NULL;
3246 
3247 	return 0;
3248 }
3249 
3250 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3251 						struct rtnl_link_stats64 *stats)
3252 {
3253 	struct bonding *bond = netdev_priv(bond_dev);
3254 	struct rtnl_link_stats64 temp;
3255 	struct list_head *iter;
3256 	struct slave *slave;
3257 
3258 	memcpy(stats, &bond->bond_stats, sizeof(*stats));
3259 
3260 	bond_for_each_slave(bond, slave, iter) {
3261 		const struct rtnl_link_stats64 *sstats =
3262 			dev_get_stats(slave->dev, &temp);
3263 		struct rtnl_link_stats64 *pstats = &slave->slave_stats;
3264 
3265 		stats->rx_packets +=  sstats->rx_packets - pstats->rx_packets;
3266 		stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
3267 		stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
3268 		stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
3269 
3270 		stats->tx_packets += sstats->tx_packets - pstats->tx_packets;;
3271 		stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
3272 		stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
3273 		stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped;
3274 
3275 		stats->multicast += sstats->multicast - pstats->multicast;
3276 		stats->collisions += sstats->collisions - pstats->collisions;
3277 
3278 		stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
3279 		stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
3280 		stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
3281 		stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
3282 		stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
3283 		stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
3284 
3285 		stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors;
3286 		stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
3287 		stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
3288 		stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
3289 		stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors;
3290 
3291 		/* save off the slave stats for the next run */
3292 		memcpy(pstats, sstats, sizeof(*sstats));
3293 	}
3294 	memcpy(&bond->bond_stats, stats, sizeof(*stats));
3295 
3296 	return stats;
3297 }
3298 
3299 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3300 {
3301 	struct bonding *bond = netdev_priv(bond_dev);
3302 	struct net_device *slave_dev = NULL;
3303 	struct ifbond k_binfo;
3304 	struct ifbond __user *u_binfo = NULL;
3305 	struct ifslave k_sinfo;
3306 	struct ifslave __user *u_sinfo = NULL;
3307 	struct mii_ioctl_data *mii = NULL;
3308 	struct bond_opt_value newval;
3309 	struct net *net;
3310 	int res = 0;
3311 
3312 	netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3313 
3314 	switch (cmd) {
3315 	case SIOCGMIIPHY:
3316 		mii = if_mii(ifr);
3317 		if (!mii)
3318 			return -EINVAL;
3319 
3320 		mii->phy_id = 0;
3321 		/* Fall Through */
3322 	case SIOCGMIIREG:
3323 		/* We do this again just in case we were called by SIOCGMIIREG
3324 		 * instead of SIOCGMIIPHY.
3325 		 */
3326 		mii = if_mii(ifr);
3327 		if (!mii)
3328 			return -EINVAL;
3329 
3330 		if (mii->reg_num == 1) {
3331 			mii->val_out = 0;
3332 			if (netif_carrier_ok(bond->dev))
3333 				mii->val_out = BMSR_LSTATUS;
3334 		}
3335 
3336 		return 0;
3337 	case BOND_INFO_QUERY_OLD:
3338 	case SIOCBONDINFOQUERY:
3339 		u_binfo = (struct ifbond __user *)ifr->ifr_data;
3340 
3341 		if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3342 			return -EFAULT;
3343 
3344 		res = bond_info_query(bond_dev, &k_binfo);
3345 		if (res == 0 &&
3346 		    copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3347 			return -EFAULT;
3348 
3349 		return res;
3350 	case BOND_SLAVE_INFO_QUERY_OLD:
3351 	case SIOCBONDSLAVEINFOQUERY:
3352 		u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3353 
3354 		if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3355 			return -EFAULT;
3356 
3357 		res = bond_slave_info_query(bond_dev, &k_sinfo);
3358 		if (res == 0 &&
3359 		    copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3360 			return -EFAULT;
3361 
3362 		return res;
3363 	default:
3364 		break;
3365 	}
3366 
3367 	net = dev_net(bond_dev);
3368 
3369 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3370 		return -EPERM;
3371 
3372 	slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3373 
3374 	netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3375 
3376 	if (!slave_dev)
3377 		return -ENODEV;
3378 
3379 	netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3380 	switch (cmd) {
3381 	case BOND_ENSLAVE_OLD:
3382 	case SIOCBONDENSLAVE:
3383 		res = bond_enslave(bond_dev, slave_dev);
3384 		break;
3385 	case BOND_RELEASE_OLD:
3386 	case SIOCBONDRELEASE:
3387 		res = bond_release(bond_dev, slave_dev);
3388 		break;
3389 	case BOND_SETHWADDR_OLD:
3390 	case SIOCBONDSETHWADDR:
3391 		bond_set_dev_addr(bond_dev, slave_dev);
3392 		res = 0;
3393 		break;
3394 	case BOND_CHANGE_ACTIVE_OLD:
3395 	case SIOCBONDCHANGEACTIVE:
3396 		bond_opt_initstr(&newval, slave_dev->name);
3397 		res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3398 		break;
3399 	default:
3400 		res = -EOPNOTSUPP;
3401 	}
3402 
3403 	return res;
3404 }
3405 
3406 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3407 {
3408 	struct bonding *bond = netdev_priv(bond_dev);
3409 
3410 	if (change & IFF_PROMISC)
3411 		bond_set_promiscuity(bond,
3412 				     bond_dev->flags & IFF_PROMISC ? 1 : -1);
3413 
3414 	if (change & IFF_ALLMULTI)
3415 		bond_set_allmulti(bond,
3416 				  bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3417 }
3418 
3419 static void bond_set_rx_mode(struct net_device *bond_dev)
3420 {
3421 	struct bonding *bond = netdev_priv(bond_dev);
3422 	struct list_head *iter;
3423 	struct slave *slave;
3424 
3425 	rcu_read_lock();
3426 	if (bond_uses_primary(bond)) {
3427 		slave = rcu_dereference(bond->curr_active_slave);
3428 		if (slave) {
3429 			dev_uc_sync(slave->dev, bond_dev);
3430 			dev_mc_sync(slave->dev, bond_dev);
3431 		}
3432 	} else {
3433 		bond_for_each_slave_rcu(bond, slave, iter) {
3434 			dev_uc_sync_multiple(slave->dev, bond_dev);
3435 			dev_mc_sync_multiple(slave->dev, bond_dev);
3436 		}
3437 	}
3438 	rcu_read_unlock();
3439 }
3440 
3441 static int bond_neigh_init(struct neighbour *n)
3442 {
3443 	struct bonding *bond = netdev_priv(n->dev);
3444 	const struct net_device_ops *slave_ops;
3445 	struct neigh_parms parms;
3446 	struct slave *slave;
3447 	int ret;
3448 
3449 	slave = bond_first_slave(bond);
3450 	if (!slave)
3451 		return 0;
3452 	slave_ops = slave->dev->netdev_ops;
3453 	if (!slave_ops->ndo_neigh_setup)
3454 		return 0;
3455 
3456 	parms.neigh_setup = NULL;
3457 	parms.neigh_cleanup = NULL;
3458 	ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3459 	if (ret)
3460 		return ret;
3461 
3462 	/* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3463 	 * after the last slave has been detached.  Assumes that all slaves
3464 	 * utilize the same neigh_cleanup (true at this writing as only user
3465 	 * is ipoib).
3466 	 */
3467 	n->parms->neigh_cleanup = parms.neigh_cleanup;
3468 
3469 	if (!parms.neigh_setup)
3470 		return 0;
3471 
3472 	return parms.neigh_setup(n);
3473 }
3474 
3475 /* The bonding ndo_neigh_setup is called at init time beofre any
3476  * slave exists. So we must declare proxy setup function which will
3477  * be used at run time to resolve the actual slave neigh param setup.
3478  *
3479  * It's also called by master devices (such as vlans) to setup their
3480  * underlying devices. In that case - do nothing, we're already set up from
3481  * our init.
3482  */
3483 static int bond_neigh_setup(struct net_device *dev,
3484 			    struct neigh_parms *parms)
3485 {
3486 	/* modify only our neigh_parms */
3487 	if (parms->dev == dev)
3488 		parms->neigh_setup = bond_neigh_init;
3489 
3490 	return 0;
3491 }
3492 
3493 /* Change the MTU of all of a master's slaves to match the master */
3494 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3495 {
3496 	struct bonding *bond = netdev_priv(bond_dev);
3497 	struct slave *slave, *rollback_slave;
3498 	struct list_head *iter;
3499 	int res = 0;
3500 
3501 	netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3502 
3503 	bond_for_each_slave(bond, slave, iter) {
3504 		netdev_dbg(bond_dev, "s %p c_m %p\n",
3505 			   slave, slave->dev->netdev_ops->ndo_change_mtu);
3506 
3507 		res = dev_set_mtu(slave->dev, new_mtu);
3508 
3509 		if (res) {
3510 			/* If we failed to set the slave's mtu to the new value
3511 			 * we must abort the operation even in ACTIVE_BACKUP
3512 			 * mode, because if we allow the backup slaves to have
3513 			 * different mtu values than the active slave we'll
3514 			 * need to change their mtu when doing a failover. That
3515 			 * means changing their mtu from timer context, which
3516 			 * is probably not a good idea.
3517 			 */
3518 			netdev_dbg(bond_dev, "err %d %s\n", res,
3519 				   slave->dev->name);
3520 			goto unwind;
3521 		}
3522 	}
3523 
3524 	bond_dev->mtu = new_mtu;
3525 
3526 	return 0;
3527 
3528 unwind:
3529 	/* unwind from head to the slave that failed */
3530 	bond_for_each_slave(bond, rollback_slave, iter) {
3531 		int tmp_res;
3532 
3533 		if (rollback_slave == slave)
3534 			break;
3535 
3536 		tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3537 		if (tmp_res) {
3538 			netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3539 				   tmp_res, rollback_slave->dev->name);
3540 		}
3541 	}
3542 
3543 	return res;
3544 }
3545 
3546 /* Change HW address
3547  *
3548  * Note that many devices must be down to change the HW address, and
3549  * downing the master releases all slaves.  We can make bonds full of
3550  * bonding devices to test this, however.
3551  */
3552 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3553 {
3554 	struct bonding *bond = netdev_priv(bond_dev);
3555 	struct slave *slave, *rollback_slave;
3556 	struct sockaddr *sa = addr, tmp_sa;
3557 	struct list_head *iter;
3558 	int res = 0;
3559 
3560 	if (BOND_MODE(bond) == BOND_MODE_ALB)
3561 		return bond_alb_set_mac_address(bond_dev, addr);
3562 
3563 
3564 	netdev_dbg(bond_dev, "bond=%p\n", bond);
3565 
3566 	/* If fail_over_mac is enabled, do nothing and return success.
3567 	 * Returning an error causes ifenslave to fail.
3568 	 */
3569 	if (bond->params.fail_over_mac &&
3570 	    BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3571 		return 0;
3572 
3573 	if (!is_valid_ether_addr(sa->sa_data))
3574 		return -EADDRNOTAVAIL;
3575 
3576 	bond_for_each_slave(bond, slave, iter) {
3577 		netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3578 		res = dev_set_mac_address(slave->dev, addr);
3579 		if (res) {
3580 			/* TODO: consider downing the slave
3581 			 * and retry ?
3582 			 * User should expect communications
3583 			 * breakage anyway until ARP finish
3584 			 * updating, so...
3585 			 */
3586 			netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3587 			goto unwind;
3588 		}
3589 	}
3590 
3591 	/* success */
3592 	memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3593 	return 0;
3594 
3595 unwind:
3596 	memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3597 	tmp_sa.sa_family = bond_dev->type;
3598 
3599 	/* unwind from head to the slave that failed */
3600 	bond_for_each_slave(bond, rollback_slave, iter) {
3601 		int tmp_res;
3602 
3603 		if (rollback_slave == slave)
3604 			break;
3605 
3606 		tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3607 		if (tmp_res) {
3608 			netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3609 				   tmp_res, rollback_slave->dev->name);
3610 		}
3611 	}
3612 
3613 	return res;
3614 }
3615 
3616 /**
3617  * bond_xmit_slave_id - transmit skb through slave with slave_id
3618  * @bond: bonding device that is transmitting
3619  * @skb: buffer to transmit
3620  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3621  *
3622  * This function tries to transmit through slave with slave_id but in case
3623  * it fails, it tries to find the first available slave for transmission.
3624  * The skb is consumed in all cases, thus the function is void.
3625  */
3626 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3627 {
3628 	struct list_head *iter;
3629 	struct slave *slave;
3630 	int i = slave_id;
3631 
3632 	/* Here we start from the slave with slave_id */
3633 	bond_for_each_slave_rcu(bond, slave, iter) {
3634 		if (--i < 0) {
3635 			if (bond_slave_can_tx(slave)) {
3636 				bond_dev_queue_xmit(bond, skb, slave->dev);
3637 				return;
3638 			}
3639 		}
3640 	}
3641 
3642 	/* Here we start from the first slave up to slave_id */
3643 	i = slave_id;
3644 	bond_for_each_slave_rcu(bond, slave, iter) {
3645 		if (--i < 0)
3646 			break;
3647 		if (bond_slave_can_tx(slave)) {
3648 			bond_dev_queue_xmit(bond, skb, slave->dev);
3649 			return;
3650 		}
3651 	}
3652 	/* no slave that can tx has been found */
3653 	bond_tx_drop(bond->dev, skb);
3654 }
3655 
3656 /**
3657  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3658  * @bond: bonding device to use
3659  *
3660  * Based on the value of the bonding device's packets_per_slave parameter
3661  * this function generates a slave id, which is usually used as the next
3662  * slave to transmit through.
3663  */
3664 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3665 {
3666 	u32 slave_id;
3667 	struct reciprocal_value reciprocal_packets_per_slave;
3668 	int packets_per_slave = bond->params.packets_per_slave;
3669 
3670 	switch (packets_per_slave) {
3671 	case 0:
3672 		slave_id = prandom_u32();
3673 		break;
3674 	case 1:
3675 		slave_id = bond->rr_tx_counter;
3676 		break;
3677 	default:
3678 		reciprocal_packets_per_slave =
3679 			bond->params.reciprocal_packets_per_slave;
3680 		slave_id = reciprocal_divide(bond->rr_tx_counter,
3681 					     reciprocal_packets_per_slave);
3682 		break;
3683 	}
3684 	bond->rr_tx_counter++;
3685 
3686 	return slave_id;
3687 }
3688 
3689 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3690 {
3691 	struct bonding *bond = netdev_priv(bond_dev);
3692 	struct iphdr *iph = ip_hdr(skb);
3693 	struct slave *slave;
3694 	u32 slave_id;
3695 
3696 	/* Start with the curr_active_slave that joined the bond as the
3697 	 * default for sending IGMP traffic.  For failover purposes one
3698 	 * needs to maintain some consistency for the interface that will
3699 	 * send the join/membership reports.  The curr_active_slave found
3700 	 * will send all of this type of traffic.
3701 	 */
3702 	if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3703 		slave = rcu_dereference(bond->curr_active_slave);
3704 		if (slave)
3705 			bond_dev_queue_xmit(bond, skb, slave->dev);
3706 		else
3707 			bond_xmit_slave_id(bond, skb, 0);
3708 	} else {
3709 		int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3710 
3711 		if (likely(slave_cnt)) {
3712 			slave_id = bond_rr_gen_slave_id(bond);
3713 			bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3714 		} else {
3715 			bond_tx_drop(bond_dev, skb);
3716 		}
3717 	}
3718 
3719 	return NETDEV_TX_OK;
3720 }
3721 
3722 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3723  * the bond has a usable interface.
3724  */
3725 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3726 {
3727 	struct bonding *bond = netdev_priv(bond_dev);
3728 	struct slave *slave;
3729 
3730 	slave = rcu_dereference(bond->curr_active_slave);
3731 	if (slave)
3732 		bond_dev_queue_xmit(bond, skb, slave->dev);
3733 	else
3734 		bond_tx_drop(bond_dev, skb);
3735 
3736 	return NETDEV_TX_OK;
3737 }
3738 
3739 /* Use this to update slave_array when (a) it's not appropriate to update
3740  * slave_array right away (note that update_slave_array() may sleep)
3741  * and / or (b) RTNL is not held.
3742  */
3743 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3744 {
3745 	queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3746 }
3747 
3748 /* Slave array work handler. Holds only RTNL */
3749 static void bond_slave_arr_handler(struct work_struct *work)
3750 {
3751 	struct bonding *bond = container_of(work, struct bonding,
3752 					    slave_arr_work.work);
3753 	int ret;
3754 
3755 	if (!rtnl_trylock())
3756 		goto err;
3757 
3758 	ret = bond_update_slave_arr(bond, NULL);
3759 	rtnl_unlock();
3760 	if (ret) {
3761 		pr_warn_ratelimited("Failed to update slave array from WT\n");
3762 		goto err;
3763 	}
3764 	return;
3765 
3766 err:
3767 	bond_slave_arr_work_rearm(bond, 1);
3768 }
3769 
3770 /* Build the usable slaves array in control path for modes that use xmit-hash
3771  * to determine the slave interface -
3772  * (a) BOND_MODE_8023AD
3773  * (b) BOND_MODE_XOR
3774  * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3775  *
3776  * The caller is expected to hold RTNL only and NO other lock!
3777  */
3778 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3779 {
3780 	struct slave *slave;
3781 	struct list_head *iter;
3782 	struct bond_up_slave *new_arr, *old_arr;
3783 	int slaves_in_agg;
3784 	int agg_id = 0;
3785 	int ret = 0;
3786 
3787 #ifdef CONFIG_LOCKDEP
3788 	WARN_ON(lockdep_is_held(&bond->mode_lock));
3789 #endif
3790 
3791 	new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3792 			  GFP_KERNEL);
3793 	if (!new_arr) {
3794 		ret = -ENOMEM;
3795 		pr_err("Failed to build slave-array.\n");
3796 		goto out;
3797 	}
3798 	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3799 		struct ad_info ad_info;
3800 
3801 		if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3802 			pr_debug("bond_3ad_get_active_agg_info failed\n");
3803 			kfree_rcu(new_arr, rcu);
3804 			/* No active aggragator means it's not safe to use
3805 			 * the previous array.
3806 			 */
3807 			old_arr = rtnl_dereference(bond->slave_arr);
3808 			if (old_arr) {
3809 				RCU_INIT_POINTER(bond->slave_arr, NULL);
3810 				kfree_rcu(old_arr, rcu);
3811 			}
3812 			goto out;
3813 		}
3814 		slaves_in_agg = ad_info.ports;
3815 		agg_id = ad_info.aggregator_id;
3816 	}
3817 	bond_for_each_slave(bond, slave, iter) {
3818 		if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3819 			struct aggregator *agg;
3820 
3821 			agg = SLAVE_AD_INFO(slave)->port.aggregator;
3822 			if (!agg || agg->aggregator_identifier != agg_id)
3823 				continue;
3824 		}
3825 		if (!bond_slave_can_tx(slave))
3826 			continue;
3827 		if (skipslave == slave)
3828 			continue;
3829 		new_arr->arr[new_arr->count++] = slave;
3830 	}
3831 
3832 	old_arr = rtnl_dereference(bond->slave_arr);
3833 	rcu_assign_pointer(bond->slave_arr, new_arr);
3834 	if (old_arr)
3835 		kfree_rcu(old_arr, rcu);
3836 out:
3837 	if (ret != 0 && skipslave) {
3838 		int idx;
3839 
3840 		/* Rare situation where caller has asked to skip a specific
3841 		 * slave but allocation failed (most likely!). BTW this is
3842 		 * only possible when the call is initiated from
3843 		 * __bond_release_one(). In this situation; overwrite the
3844 		 * skipslave entry in the array with the last entry from the
3845 		 * array to avoid a situation where the xmit path may choose
3846 		 * this to-be-skipped slave to send a packet out.
3847 		 */
3848 		old_arr = rtnl_dereference(bond->slave_arr);
3849 		for (idx = 0; idx < old_arr->count; idx++) {
3850 			if (skipslave == old_arr->arr[idx]) {
3851 				old_arr->arr[idx] =
3852 				    old_arr->arr[old_arr->count-1];
3853 				old_arr->count--;
3854 				break;
3855 			}
3856 		}
3857 	}
3858 	return ret;
3859 }
3860 
3861 /* Use this Xmit function for 3AD as well as XOR modes. The current
3862  * usable slave array is formed in the control path. The xmit function
3863  * just calculates hash and sends the packet out.
3864  */
3865 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3866 {
3867 	struct bonding *bond = netdev_priv(dev);
3868 	struct slave *slave;
3869 	struct bond_up_slave *slaves;
3870 	unsigned int count;
3871 
3872 	slaves = rcu_dereference(bond->slave_arr);
3873 	count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3874 	if (likely(count)) {
3875 		slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3876 		bond_dev_queue_xmit(bond, skb, slave->dev);
3877 	} else {
3878 		bond_tx_drop(dev, skb);
3879 	}
3880 
3881 	return NETDEV_TX_OK;
3882 }
3883 
3884 /* in broadcast mode, we send everything to all usable interfaces. */
3885 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3886 {
3887 	struct bonding *bond = netdev_priv(bond_dev);
3888 	struct slave *slave = NULL;
3889 	struct list_head *iter;
3890 
3891 	bond_for_each_slave_rcu(bond, slave, iter) {
3892 		if (bond_is_last_slave(bond, slave))
3893 			break;
3894 		if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3895 			struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3896 
3897 			if (!skb2) {
3898 				net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3899 						    bond_dev->name, __func__);
3900 				continue;
3901 			}
3902 			bond_dev_queue_xmit(bond, skb2, slave->dev);
3903 		}
3904 	}
3905 	if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3906 		bond_dev_queue_xmit(bond, skb, slave->dev);
3907 	else
3908 		bond_tx_drop(bond_dev, skb);
3909 
3910 	return NETDEV_TX_OK;
3911 }
3912 
3913 /*------------------------- Device initialization ---------------------------*/
3914 
3915 /* Lookup the slave that corresponds to a qid */
3916 static inline int bond_slave_override(struct bonding *bond,
3917 				      struct sk_buff *skb)
3918 {
3919 	struct slave *slave = NULL;
3920 	struct list_head *iter;
3921 
3922 	if (!skb->queue_mapping)
3923 		return 1;
3924 
3925 	/* Find out if any slaves have the same mapping as this skb. */
3926 	bond_for_each_slave_rcu(bond, slave, iter) {
3927 		if (slave->queue_id == skb->queue_mapping) {
3928 			if (bond_slave_is_up(slave) &&
3929 			    slave->link == BOND_LINK_UP) {
3930 				bond_dev_queue_xmit(bond, skb, slave->dev);
3931 				return 0;
3932 			}
3933 			/* If the slave isn't UP, use default transmit policy. */
3934 			break;
3935 		}
3936 	}
3937 
3938 	return 1;
3939 }
3940 
3941 
3942 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3943 			     void *accel_priv, select_queue_fallback_t fallback)
3944 {
3945 	/* This helper function exists to help dev_pick_tx get the correct
3946 	 * destination queue.  Using a helper function skips a call to
3947 	 * skb_tx_hash and will put the skbs in the queue we expect on their
3948 	 * way down to the bonding driver.
3949 	 */
3950 	u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3951 
3952 	/* Save the original txq to restore before passing to the driver */
3953 	qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3954 
3955 	if (unlikely(txq >= dev->real_num_tx_queues)) {
3956 		do {
3957 			txq -= dev->real_num_tx_queues;
3958 		} while (txq >= dev->real_num_tx_queues);
3959 	}
3960 	return txq;
3961 }
3962 
3963 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3964 {
3965 	struct bonding *bond = netdev_priv(dev);
3966 
3967 	if (bond_should_override_tx_queue(bond) &&
3968 	    !bond_slave_override(bond, skb))
3969 		return NETDEV_TX_OK;
3970 
3971 	switch (BOND_MODE(bond)) {
3972 	case BOND_MODE_ROUNDROBIN:
3973 		return bond_xmit_roundrobin(skb, dev);
3974 	case BOND_MODE_ACTIVEBACKUP:
3975 		return bond_xmit_activebackup(skb, dev);
3976 	case BOND_MODE_8023AD:
3977 	case BOND_MODE_XOR:
3978 		return bond_3ad_xor_xmit(skb, dev);
3979 	case BOND_MODE_BROADCAST:
3980 		return bond_xmit_broadcast(skb, dev);
3981 	case BOND_MODE_ALB:
3982 		return bond_alb_xmit(skb, dev);
3983 	case BOND_MODE_TLB:
3984 		return bond_tlb_xmit(skb, dev);
3985 	default:
3986 		/* Should never happen, mode already checked */
3987 		netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
3988 		WARN_ON_ONCE(1);
3989 		bond_tx_drop(dev, skb);
3990 		return NETDEV_TX_OK;
3991 	}
3992 }
3993 
3994 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3995 {
3996 	struct bonding *bond = netdev_priv(dev);
3997 	netdev_tx_t ret = NETDEV_TX_OK;
3998 
3999 	/* If we risk deadlock from transmitting this in the
4000 	 * netpoll path, tell netpoll to queue the frame for later tx
4001 	 */
4002 	if (unlikely(is_netpoll_tx_blocked(dev)))
4003 		return NETDEV_TX_BUSY;
4004 
4005 	rcu_read_lock();
4006 	if (bond_has_slaves(bond))
4007 		ret = __bond_start_xmit(skb, dev);
4008 	else
4009 		bond_tx_drop(dev, skb);
4010 	rcu_read_unlock();
4011 
4012 	return ret;
4013 }
4014 
4015 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4016 				     struct ethtool_cmd *ecmd)
4017 {
4018 	struct bonding *bond = netdev_priv(bond_dev);
4019 	unsigned long speed = 0;
4020 	struct list_head *iter;
4021 	struct slave *slave;
4022 
4023 	ecmd->duplex = DUPLEX_UNKNOWN;
4024 	ecmd->port = PORT_OTHER;
4025 
4026 	/* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4027 	 * do not need to check mode.  Though link speed might not represent
4028 	 * the true receive or transmit bandwidth (not all modes are symmetric)
4029 	 * this is an accurate maximum.
4030 	 */
4031 	bond_for_each_slave(bond, slave, iter) {
4032 		if (bond_slave_can_tx(slave)) {
4033 			if (slave->speed != SPEED_UNKNOWN)
4034 				speed += slave->speed;
4035 			if (ecmd->duplex == DUPLEX_UNKNOWN &&
4036 			    slave->duplex != DUPLEX_UNKNOWN)
4037 				ecmd->duplex = slave->duplex;
4038 		}
4039 	}
4040 	ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4041 
4042 	return 0;
4043 }
4044 
4045 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4046 				     struct ethtool_drvinfo *drvinfo)
4047 {
4048 	strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4049 	strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4050 	snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4051 		 BOND_ABI_VERSION);
4052 }
4053 
4054 static const struct ethtool_ops bond_ethtool_ops = {
4055 	.get_drvinfo		= bond_ethtool_get_drvinfo,
4056 	.get_settings		= bond_ethtool_get_settings,
4057 	.get_link		= ethtool_op_get_link,
4058 };
4059 
4060 static const struct net_device_ops bond_netdev_ops = {
4061 	.ndo_init		= bond_init,
4062 	.ndo_uninit		= bond_uninit,
4063 	.ndo_open		= bond_open,
4064 	.ndo_stop		= bond_close,
4065 	.ndo_start_xmit		= bond_start_xmit,
4066 	.ndo_select_queue	= bond_select_queue,
4067 	.ndo_get_stats64	= bond_get_stats,
4068 	.ndo_do_ioctl		= bond_do_ioctl,
4069 	.ndo_change_rx_flags	= bond_change_rx_flags,
4070 	.ndo_set_rx_mode	= bond_set_rx_mode,
4071 	.ndo_change_mtu		= bond_change_mtu,
4072 	.ndo_set_mac_address	= bond_set_mac_address,
4073 	.ndo_neigh_setup	= bond_neigh_setup,
4074 	.ndo_vlan_rx_add_vid	= bond_vlan_rx_add_vid,
4075 	.ndo_vlan_rx_kill_vid	= bond_vlan_rx_kill_vid,
4076 #ifdef CONFIG_NET_POLL_CONTROLLER
4077 	.ndo_netpoll_setup	= bond_netpoll_setup,
4078 	.ndo_netpoll_cleanup	= bond_netpoll_cleanup,
4079 	.ndo_poll_controller	= bond_poll_controller,
4080 #endif
4081 	.ndo_add_slave		= bond_enslave,
4082 	.ndo_del_slave		= bond_release,
4083 	.ndo_fix_features	= bond_fix_features,
4084 	.ndo_bridge_setlink	= switchdev_port_bridge_setlink,
4085 	.ndo_bridge_getlink	= switchdev_port_bridge_getlink,
4086 	.ndo_bridge_dellink	= switchdev_port_bridge_dellink,
4087 	.ndo_fdb_add		= switchdev_port_fdb_add,
4088 	.ndo_fdb_del		= switchdev_port_fdb_del,
4089 	.ndo_fdb_dump		= switchdev_port_fdb_dump,
4090 	.ndo_features_check	= passthru_features_check,
4091 };
4092 
4093 static const struct device_type bond_type = {
4094 	.name = "bond",
4095 };
4096 
4097 static void bond_destructor(struct net_device *bond_dev)
4098 {
4099 	struct bonding *bond = netdev_priv(bond_dev);
4100 	if (bond->wq)
4101 		destroy_workqueue(bond->wq);
4102 	free_netdev(bond_dev);
4103 }
4104 
4105 void bond_setup(struct net_device *bond_dev)
4106 {
4107 	struct bonding *bond = netdev_priv(bond_dev);
4108 
4109 	spin_lock_init(&bond->mode_lock);
4110 	bond->params = bonding_defaults;
4111 
4112 	/* Initialize pointers */
4113 	bond->dev = bond_dev;
4114 
4115 	/* Initialize the device entry points */
4116 	ether_setup(bond_dev);
4117 	bond_dev->netdev_ops = &bond_netdev_ops;
4118 	bond_dev->ethtool_ops = &bond_ethtool_ops;
4119 
4120 	bond_dev->destructor = bond_destructor;
4121 
4122 	SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4123 
4124 	/* Initialize the device options */
4125 	bond_dev->tx_queue_len = 0;
4126 	bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4127 	bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT;
4128 	bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4129 
4130 	/* don't acquire bond device's netif_tx_lock when transmitting */
4131 	bond_dev->features |= NETIF_F_LLTX;
4132 
4133 	/* By default, we declare the bond to be fully
4134 	 * VLAN hardware accelerated capable. Special
4135 	 * care is taken in the various xmit functions
4136 	 * when there are slaves that are not hw accel
4137 	 * capable
4138 	 */
4139 
4140 	/* Don't allow bond devices to change network namespaces. */
4141 	bond_dev->features |= NETIF_F_NETNS_LOCAL;
4142 
4143 	bond_dev->hw_features = BOND_VLAN_FEATURES |
4144 				NETIF_F_HW_VLAN_CTAG_TX |
4145 				NETIF_F_HW_VLAN_CTAG_RX |
4146 				NETIF_F_HW_VLAN_CTAG_FILTER;
4147 
4148 	bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4149 	bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4150 	bond_dev->features |= bond_dev->hw_features;
4151 }
4152 
4153 /* Destroy a bonding device.
4154  * Must be under rtnl_lock when this function is called.
4155  */
4156 static void bond_uninit(struct net_device *bond_dev)
4157 {
4158 	struct bonding *bond = netdev_priv(bond_dev);
4159 	struct list_head *iter;
4160 	struct slave *slave;
4161 	struct bond_up_slave *arr;
4162 
4163 	bond_netpoll_cleanup(bond_dev);
4164 
4165 	/* Release the bonded slaves */
4166 	bond_for_each_slave(bond, slave, iter)
4167 		__bond_release_one(bond_dev, slave->dev, true);
4168 	netdev_info(bond_dev, "Released all slaves\n");
4169 
4170 	arr = rtnl_dereference(bond->slave_arr);
4171 	if (arr) {
4172 		RCU_INIT_POINTER(bond->slave_arr, NULL);
4173 		kfree_rcu(arr, rcu);
4174 	}
4175 
4176 	list_del(&bond->bond_list);
4177 
4178 	bond_debug_unregister(bond);
4179 }
4180 
4181 /*------------------------- Module initialization ---------------------------*/
4182 
4183 static int bond_check_params(struct bond_params *params)
4184 {
4185 	int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4186 	struct bond_opt_value newval;
4187 	const struct bond_opt_value *valptr;
4188 	int arp_all_targets_value;
4189 	u16 ad_actor_sys_prio = 0;
4190 	u16 ad_user_port_key = 0;
4191 
4192 	/* Convert string parameters. */
4193 	if (mode) {
4194 		bond_opt_initstr(&newval, mode);
4195 		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4196 		if (!valptr) {
4197 			pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4198 			return -EINVAL;
4199 		}
4200 		bond_mode = valptr->value;
4201 	}
4202 
4203 	if (xmit_hash_policy) {
4204 		if ((bond_mode != BOND_MODE_XOR) &&
4205 		    (bond_mode != BOND_MODE_8023AD) &&
4206 		    (bond_mode != BOND_MODE_TLB)) {
4207 			pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4208 				bond_mode_name(bond_mode));
4209 		} else {
4210 			bond_opt_initstr(&newval, xmit_hash_policy);
4211 			valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4212 						&newval);
4213 			if (!valptr) {
4214 				pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4215 				       xmit_hash_policy);
4216 				return -EINVAL;
4217 			}
4218 			xmit_hashtype = valptr->value;
4219 		}
4220 	}
4221 
4222 	if (lacp_rate) {
4223 		if (bond_mode != BOND_MODE_8023AD) {
4224 			pr_info("lacp_rate param is irrelevant in mode %s\n",
4225 				bond_mode_name(bond_mode));
4226 		} else {
4227 			bond_opt_initstr(&newval, lacp_rate);
4228 			valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4229 						&newval);
4230 			if (!valptr) {
4231 				pr_err("Error: Invalid lacp rate \"%s\"\n",
4232 				       lacp_rate);
4233 				return -EINVAL;
4234 			}
4235 			lacp_fast = valptr->value;
4236 		}
4237 	}
4238 
4239 	if (ad_select) {
4240 		bond_opt_initstr(&newval, ad_select);
4241 		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4242 					&newval);
4243 		if (!valptr) {
4244 			pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4245 			return -EINVAL;
4246 		}
4247 		params->ad_select = valptr->value;
4248 		if (bond_mode != BOND_MODE_8023AD)
4249 			pr_warn("ad_select param only affects 802.3ad mode\n");
4250 	} else {
4251 		params->ad_select = BOND_AD_STABLE;
4252 	}
4253 
4254 	if (max_bonds < 0) {
4255 		pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4256 			max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4257 		max_bonds = BOND_DEFAULT_MAX_BONDS;
4258 	}
4259 
4260 	if (miimon < 0) {
4261 		pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4262 			miimon, INT_MAX);
4263 		miimon = 0;
4264 	}
4265 
4266 	if (updelay < 0) {
4267 		pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4268 			updelay, INT_MAX);
4269 		updelay = 0;
4270 	}
4271 
4272 	if (downdelay < 0) {
4273 		pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4274 			downdelay, INT_MAX);
4275 		downdelay = 0;
4276 	}
4277 
4278 	if ((use_carrier != 0) && (use_carrier != 1)) {
4279 		pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4280 			use_carrier);
4281 		use_carrier = 1;
4282 	}
4283 
4284 	if (num_peer_notif < 0 || num_peer_notif > 255) {
4285 		pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4286 			num_peer_notif);
4287 		num_peer_notif = 1;
4288 	}
4289 
4290 	/* reset values for 802.3ad/TLB/ALB */
4291 	if (!bond_mode_uses_arp(bond_mode)) {
4292 		if (!miimon) {
4293 			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");
4294 			pr_warn("Forcing miimon to 100msec\n");
4295 			miimon = BOND_DEFAULT_MIIMON;
4296 		}
4297 	}
4298 
4299 	if (tx_queues < 1 || tx_queues > 255) {
4300 		pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4301 			tx_queues, BOND_DEFAULT_TX_QUEUES);
4302 		tx_queues = BOND_DEFAULT_TX_QUEUES;
4303 	}
4304 
4305 	if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4306 		pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4307 			all_slaves_active);
4308 		all_slaves_active = 0;
4309 	}
4310 
4311 	if (resend_igmp < 0 || resend_igmp > 255) {
4312 		pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4313 			resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4314 		resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4315 	}
4316 
4317 	bond_opt_initval(&newval, packets_per_slave);
4318 	if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4319 		pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4320 			packets_per_slave, USHRT_MAX);
4321 		packets_per_slave = 1;
4322 	}
4323 
4324 	if (bond_mode == BOND_MODE_ALB) {
4325 		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",
4326 			  updelay);
4327 	}
4328 
4329 	if (!miimon) {
4330 		if (updelay || downdelay) {
4331 			/* just warn the user the up/down delay will have
4332 			 * no effect since miimon is zero...
4333 			 */
4334 			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",
4335 				updelay, downdelay);
4336 		}
4337 	} else {
4338 		/* don't allow arp monitoring */
4339 		if (arp_interval) {
4340 			pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4341 				miimon, arp_interval);
4342 			arp_interval = 0;
4343 		}
4344 
4345 		if ((updelay % miimon) != 0) {
4346 			pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4347 				updelay, miimon, (updelay / miimon) * miimon);
4348 		}
4349 
4350 		updelay /= miimon;
4351 
4352 		if ((downdelay % miimon) != 0) {
4353 			pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4354 				downdelay, miimon,
4355 				(downdelay / miimon) * miimon);
4356 		}
4357 
4358 		downdelay /= miimon;
4359 	}
4360 
4361 	if (arp_interval < 0) {
4362 		pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4363 			arp_interval, INT_MAX);
4364 		arp_interval = 0;
4365 	}
4366 
4367 	for (arp_ip_count = 0, i = 0;
4368 	     (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4369 		__be32 ip;
4370 
4371 		/* not a complete check, but good enough to catch mistakes */
4372 		if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4373 		    !bond_is_ip_target_ok(ip)) {
4374 			pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4375 				arp_ip_target[i]);
4376 			arp_interval = 0;
4377 		} else {
4378 			if (bond_get_targets_ip(arp_target, ip) == -1)
4379 				arp_target[arp_ip_count++] = ip;
4380 			else
4381 				pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4382 					&ip);
4383 		}
4384 	}
4385 
4386 	if (arp_interval && !arp_ip_count) {
4387 		/* don't allow arping if no arp_ip_target given... */
4388 		pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4389 			arp_interval);
4390 		arp_interval = 0;
4391 	}
4392 
4393 	if (arp_validate) {
4394 		if (!arp_interval) {
4395 			pr_err("arp_validate requires arp_interval\n");
4396 			return -EINVAL;
4397 		}
4398 
4399 		bond_opt_initstr(&newval, arp_validate);
4400 		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4401 					&newval);
4402 		if (!valptr) {
4403 			pr_err("Error: invalid arp_validate \"%s\"\n",
4404 			       arp_validate);
4405 			return -EINVAL;
4406 		}
4407 		arp_validate_value = valptr->value;
4408 	} else {
4409 		arp_validate_value = 0;
4410 	}
4411 
4412 	arp_all_targets_value = 0;
4413 	if (arp_all_targets) {
4414 		bond_opt_initstr(&newval, arp_all_targets);
4415 		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4416 					&newval);
4417 		if (!valptr) {
4418 			pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4419 			       arp_all_targets);
4420 			arp_all_targets_value = 0;
4421 		} else {
4422 			arp_all_targets_value = valptr->value;
4423 		}
4424 	}
4425 
4426 	if (miimon) {
4427 		pr_info("MII link monitoring set to %d ms\n", miimon);
4428 	} else if (arp_interval) {
4429 		valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4430 					  arp_validate_value);
4431 		pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4432 			arp_interval, valptr->string, arp_ip_count);
4433 
4434 		for (i = 0; i < arp_ip_count; i++)
4435 			pr_cont(" %s", arp_ip_target[i]);
4436 
4437 		pr_cont("\n");
4438 
4439 	} else if (max_bonds) {
4440 		/* miimon and arp_interval not set, we need one so things
4441 		 * work as expected, see bonding.txt for details
4442 		 */
4443 		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");
4444 	}
4445 
4446 	if (primary && !bond_mode_uses_primary(bond_mode)) {
4447 		/* currently, using a primary only makes sense
4448 		 * in active backup, TLB or ALB modes
4449 		 */
4450 		pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4451 			primary, bond_mode_name(bond_mode));
4452 		primary = NULL;
4453 	}
4454 
4455 	if (primary && primary_reselect) {
4456 		bond_opt_initstr(&newval, primary_reselect);
4457 		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4458 					&newval);
4459 		if (!valptr) {
4460 			pr_err("Error: Invalid primary_reselect \"%s\"\n",
4461 			       primary_reselect);
4462 			return -EINVAL;
4463 		}
4464 		primary_reselect_value = valptr->value;
4465 	} else {
4466 		primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4467 	}
4468 
4469 	if (fail_over_mac) {
4470 		bond_opt_initstr(&newval, fail_over_mac);
4471 		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4472 					&newval);
4473 		if (!valptr) {
4474 			pr_err("Error: invalid fail_over_mac \"%s\"\n",
4475 			       fail_over_mac);
4476 			return -EINVAL;
4477 		}
4478 		fail_over_mac_value = valptr->value;
4479 		if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4480 			pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4481 	} else {
4482 		fail_over_mac_value = BOND_FOM_NONE;
4483 	}
4484 
4485 	bond_opt_initstr(&newval, "default");
4486 	valptr = bond_opt_parse(
4487 			bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4488 				     &newval);
4489 	if (!valptr) {
4490 		pr_err("Error: No ad_actor_sys_prio default value");
4491 		return -EINVAL;
4492 	}
4493 	ad_actor_sys_prio = valptr->value;
4494 
4495 	valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4496 				&newval);
4497 	if (!valptr) {
4498 		pr_err("Error: No ad_user_port_key default value");
4499 		return -EINVAL;
4500 	}
4501 	ad_user_port_key = valptr->value;
4502 
4503 	if (lp_interval == 0) {
4504 		pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4505 			INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4506 		lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4507 	}
4508 
4509 	/* fill params struct with the proper values */
4510 	params->mode = bond_mode;
4511 	params->xmit_policy = xmit_hashtype;
4512 	params->miimon = miimon;
4513 	params->num_peer_notif = num_peer_notif;
4514 	params->arp_interval = arp_interval;
4515 	params->arp_validate = arp_validate_value;
4516 	params->arp_all_targets = arp_all_targets_value;
4517 	params->updelay = updelay;
4518 	params->downdelay = downdelay;
4519 	params->use_carrier = use_carrier;
4520 	params->lacp_fast = lacp_fast;
4521 	params->primary[0] = 0;
4522 	params->primary_reselect = primary_reselect_value;
4523 	params->fail_over_mac = fail_over_mac_value;
4524 	params->tx_queues = tx_queues;
4525 	params->all_slaves_active = all_slaves_active;
4526 	params->resend_igmp = resend_igmp;
4527 	params->min_links = min_links;
4528 	params->lp_interval = lp_interval;
4529 	params->packets_per_slave = packets_per_slave;
4530 	params->tlb_dynamic_lb = 1; /* Default value */
4531 	params->ad_actor_sys_prio = ad_actor_sys_prio;
4532 	eth_zero_addr(params->ad_actor_system);
4533 	params->ad_user_port_key = ad_user_port_key;
4534 	if (packets_per_slave > 0) {
4535 		params->reciprocal_packets_per_slave =
4536 			reciprocal_value(packets_per_slave);
4537 	} else {
4538 		/* reciprocal_packets_per_slave is unused if
4539 		 * packets_per_slave is 0 or 1, just initialize it
4540 		 */
4541 		params->reciprocal_packets_per_slave =
4542 			(struct reciprocal_value) { 0 };
4543 	}
4544 
4545 	if (primary) {
4546 		strncpy(params->primary, primary, IFNAMSIZ);
4547 		params->primary[IFNAMSIZ - 1] = 0;
4548 	}
4549 
4550 	memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4551 
4552 	return 0;
4553 }
4554 
4555 static struct lock_class_key bonding_netdev_xmit_lock_key;
4556 static struct lock_class_key bonding_netdev_addr_lock_key;
4557 static struct lock_class_key bonding_tx_busylock_key;
4558 
4559 static void bond_set_lockdep_class_one(struct net_device *dev,
4560 				       struct netdev_queue *txq,
4561 				       void *_unused)
4562 {
4563 	lockdep_set_class(&txq->_xmit_lock,
4564 			  &bonding_netdev_xmit_lock_key);
4565 }
4566 
4567 static void bond_set_lockdep_class(struct net_device *dev)
4568 {
4569 	lockdep_set_class(&dev->addr_list_lock,
4570 			  &bonding_netdev_addr_lock_key);
4571 	netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4572 	dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4573 }
4574 
4575 /* Called from registration process */
4576 static int bond_init(struct net_device *bond_dev)
4577 {
4578 	struct bonding *bond = netdev_priv(bond_dev);
4579 	struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4580 
4581 	netdev_dbg(bond_dev, "Begin bond_init\n");
4582 
4583 	bond->wq = create_singlethread_workqueue(bond_dev->name);
4584 	if (!bond->wq)
4585 		return -ENOMEM;
4586 
4587 	bond_set_lockdep_class(bond_dev);
4588 
4589 	list_add_tail(&bond->bond_list, &bn->dev_list);
4590 
4591 	bond_prepare_sysfs_group(bond);
4592 
4593 	bond_debug_register(bond);
4594 
4595 	/* Ensure valid dev_addr */
4596 	if (is_zero_ether_addr(bond_dev->dev_addr) &&
4597 	    bond_dev->addr_assign_type == NET_ADDR_PERM)
4598 		eth_hw_addr_random(bond_dev);
4599 
4600 	return 0;
4601 }
4602 
4603 unsigned int bond_get_num_tx_queues(void)
4604 {
4605 	return tx_queues;
4606 }
4607 
4608 /* Create a new bond based on the specified name and bonding parameters.
4609  * If name is NULL, obtain a suitable "bond%d" name for us.
4610  * Caller must NOT hold rtnl_lock; we need to release it here before we
4611  * set up our sysfs entries.
4612  */
4613 int bond_create(struct net *net, const char *name)
4614 {
4615 	struct net_device *bond_dev;
4616 	struct bonding *bond;
4617 	struct alb_bond_info *bond_info;
4618 	int res;
4619 
4620 	rtnl_lock();
4621 
4622 	bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4623 				   name ? name : "bond%d", NET_NAME_UNKNOWN,
4624 				   bond_setup, tx_queues);
4625 	if (!bond_dev) {
4626 		pr_err("%s: eek! can't alloc netdev!\n", name);
4627 		rtnl_unlock();
4628 		return -ENOMEM;
4629 	}
4630 
4631 	/*
4632 	 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4633 	 * It is set to 0 by default which is wrong.
4634 	 */
4635 	bond = netdev_priv(bond_dev);
4636 	bond_info = &(BOND_ALB_INFO(bond));
4637 	bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4638 
4639 	dev_net_set(bond_dev, net);
4640 	bond_dev->rtnl_link_ops = &bond_link_ops;
4641 
4642 	res = register_netdevice(bond_dev);
4643 
4644 	netif_carrier_off(bond_dev);
4645 
4646 	rtnl_unlock();
4647 	if (res < 0)
4648 		bond_destructor(bond_dev);
4649 	return res;
4650 }
4651 
4652 static int __net_init bond_net_init(struct net *net)
4653 {
4654 	struct bond_net *bn = net_generic(net, bond_net_id);
4655 
4656 	bn->net = net;
4657 	INIT_LIST_HEAD(&bn->dev_list);
4658 
4659 	bond_create_proc_dir(bn);
4660 	bond_create_sysfs(bn);
4661 
4662 	return 0;
4663 }
4664 
4665 static void __net_exit bond_net_exit(struct net *net)
4666 {
4667 	struct bond_net *bn = net_generic(net, bond_net_id);
4668 	struct bonding *bond, *tmp_bond;
4669 	LIST_HEAD(list);
4670 
4671 	bond_destroy_sysfs(bn);
4672 
4673 	/* Kill off any bonds created after unregistering bond rtnl ops */
4674 	rtnl_lock();
4675 	list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4676 		unregister_netdevice_queue(bond->dev, &list);
4677 	unregister_netdevice_many(&list);
4678 	rtnl_unlock();
4679 
4680 	bond_destroy_proc_dir(bn);
4681 }
4682 
4683 static struct pernet_operations bond_net_ops = {
4684 	.init = bond_net_init,
4685 	.exit = bond_net_exit,
4686 	.id   = &bond_net_id,
4687 	.size = sizeof(struct bond_net),
4688 };
4689 
4690 static int __init bonding_init(void)
4691 {
4692 	int i;
4693 	int res;
4694 
4695 	pr_info("%s", bond_version);
4696 
4697 	res = bond_check_params(&bonding_defaults);
4698 	if (res)
4699 		goto out;
4700 
4701 	res = register_pernet_subsys(&bond_net_ops);
4702 	if (res)
4703 		goto out;
4704 
4705 	res = bond_netlink_init();
4706 	if (res)
4707 		goto err_link;
4708 
4709 	bond_create_debugfs();
4710 
4711 	for (i = 0; i < max_bonds; i++) {
4712 		res = bond_create(&init_net, NULL);
4713 		if (res)
4714 			goto err;
4715 	}
4716 
4717 	register_netdevice_notifier(&bond_netdev_notifier);
4718 out:
4719 	return res;
4720 err:
4721 	bond_destroy_debugfs();
4722 	bond_netlink_fini();
4723 err_link:
4724 	unregister_pernet_subsys(&bond_net_ops);
4725 	goto out;
4726 
4727 }
4728 
4729 static void __exit bonding_exit(void)
4730 {
4731 	unregister_netdevice_notifier(&bond_netdev_notifier);
4732 
4733 	bond_destroy_debugfs();
4734 
4735 	bond_netlink_fini();
4736 	unregister_pernet_subsys(&bond_net_ops);
4737 
4738 #ifdef CONFIG_NET_POLL_CONTROLLER
4739 	/* Make sure we don't have an imbalance on our netpoll blocking */
4740 	WARN_ON(atomic_read(&netpoll_block_tx));
4741 #endif
4742 }
4743 
4744 module_init(bonding_init);
4745 module_exit(bonding_exit);
4746 MODULE_LICENSE("GPL");
4747 MODULE_VERSION(DRV_VERSION);
4748 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4749 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4750