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Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[deliverable/linux.git] / drivers / net / bonding / bond_main.c
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 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
218 int mod);
219
220 /*---------------------------- General routines -----------------------------*/
221
222 const char *bond_mode_name(int mode)
223 {
224 static const char *names[] = {
225 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
226 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
227 [BOND_MODE_XOR] = "load balancing (xor)",
228 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
229 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
230 [BOND_MODE_TLB] = "transmit load balancing",
231 [BOND_MODE_ALB] = "adaptive load balancing",
232 };
233
234 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
235 return "unknown";
236
237 return names[mode];
238 }
239
240 /*---------------------------------- VLAN -----------------------------------*/
241
242 /**
243 * bond_dev_queue_xmit - Prepare skb for xmit.
244 *
245 * @bond: bond device that got this skb for tx.
246 * @skb: hw accel VLAN tagged skb to transmit
247 * @slave_dev: slave that is supposed to xmit this skbuff
248 */
249 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
250 struct net_device *slave_dev)
251 {
252 skb->dev = slave_dev;
253
254 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
255 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
256 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
257
258 if (unlikely(netpoll_tx_running(bond->dev)))
259 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
260 else
261 dev_queue_xmit(skb);
262 }
263
264 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
265 * We don't protect the slave list iteration with a lock because:
266 * a. This operation is performed in IOCTL context,
267 * b. The operation is protected by the RTNL semaphore in the 8021q code,
268 * c. Holding a lock with BH disabled while directly calling a base driver
269 * entry point is generally a BAD idea.
270 *
271 * The design of synchronization/protection for this operation in the 8021q
272 * module is good for one or more VLAN devices over a single physical device
273 * and cannot be extended for a teaming solution like bonding, so there is a
274 * potential race condition here where a net device from the vlan group might
275 * be referenced (either by a base driver or the 8021q code) while it is being
276 * removed from the system. However, it turns out we're not making matters
277 * worse, and if it works for regular VLAN usage it will work here too.
278 */
279
280 /**
281 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
282 * @bond_dev: bonding net device that got called
283 * @vid: vlan id being added
284 */
285 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
286 __be16 proto, u16 vid)
287 {
288 struct bonding *bond = netdev_priv(bond_dev);
289 struct slave *slave, *rollback_slave;
290 struct list_head *iter;
291 int res;
292
293 bond_for_each_slave(bond, slave, iter) {
294 res = vlan_vid_add(slave->dev, proto, vid);
295 if (res)
296 goto unwind;
297 }
298
299 return 0;
300
301 unwind:
302 /* unwind to the slave that failed */
303 bond_for_each_slave(bond, rollback_slave, iter) {
304 if (rollback_slave == slave)
305 break;
306
307 vlan_vid_del(rollback_slave->dev, proto, vid);
308 }
309
310 return res;
311 }
312
313 /**
314 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
315 * @bond_dev: bonding net device that got called
316 * @vid: vlan id being removed
317 */
318 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
319 __be16 proto, u16 vid)
320 {
321 struct bonding *bond = netdev_priv(bond_dev);
322 struct list_head *iter;
323 struct slave *slave;
324
325 bond_for_each_slave(bond, slave, iter)
326 vlan_vid_del(slave->dev, proto, vid);
327
328 if (bond_is_lb(bond))
329 bond_alb_clear_vlan(bond, vid);
330
331 return 0;
332 }
333
334 /*------------------------------- Link status -------------------------------*/
335
336 /* Set the carrier state for the master according to the state of its
337 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
338 * do special 802.3ad magic.
339 *
340 * Returns zero if carrier state does not change, nonzero if it does.
341 */
342 int bond_set_carrier(struct bonding *bond)
343 {
344 struct list_head *iter;
345 struct slave *slave;
346
347 if (!bond_has_slaves(bond))
348 goto down;
349
350 if (BOND_MODE(bond) == BOND_MODE_8023AD)
351 return bond_3ad_set_carrier(bond);
352
353 bond_for_each_slave(bond, slave, iter) {
354 if (slave->link == BOND_LINK_UP) {
355 if (!netif_carrier_ok(bond->dev)) {
356 netif_carrier_on(bond->dev);
357 return 1;
358 }
359 return 0;
360 }
361 }
362
363 down:
364 if (netif_carrier_ok(bond->dev)) {
365 netif_carrier_off(bond->dev);
366 return 1;
367 }
368 return 0;
369 }
370
371 /* Get link speed and duplex from the slave's base driver
372 * using ethtool. If for some reason the call fails or the
373 * values are invalid, set speed and duplex to -1,
374 * and return.
375 */
376 static void bond_update_speed_duplex(struct slave *slave)
377 {
378 struct net_device *slave_dev = slave->dev;
379 struct ethtool_link_ksettings ecmd;
380 int res;
381
382 slave->speed = SPEED_UNKNOWN;
383 slave->duplex = DUPLEX_UNKNOWN;
384
385 res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
386 if (res < 0)
387 return;
388
389 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
390 return;
391
392 switch (ecmd.base.duplex) {
393 case DUPLEX_FULL:
394 case DUPLEX_HALF:
395 break;
396 default:
397 return;
398 }
399
400 slave->speed = ecmd.base.speed;
401 slave->duplex = ecmd.base.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->name=%s slave_dev->addr_len=%d\n",
622 bond_dev, slave_dev, slave_dev->name, 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 BOND_SLAVE_NOTIFY_NOW);
835
836 if (BOND_MODE(bond) == BOND_MODE_8023AD)
837 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
838
839 if (bond_is_lb(bond))
840 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
841 } else {
842 if (bond_uses_primary(bond)) {
843 netdev_info(bond->dev, "making interface %s the new active one\n",
844 new_active->dev->name);
845 }
846 }
847 }
848
849 if (bond_uses_primary(bond))
850 bond_hw_addr_swap(bond, new_active, old_active);
851
852 if (bond_is_lb(bond)) {
853 bond_alb_handle_active_change(bond, new_active);
854 if (old_active)
855 bond_set_slave_inactive_flags(old_active,
856 BOND_SLAVE_NOTIFY_NOW);
857 if (new_active)
858 bond_set_slave_active_flags(new_active,
859 BOND_SLAVE_NOTIFY_NOW);
860 } else {
861 rcu_assign_pointer(bond->curr_active_slave, new_active);
862 }
863
864 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
865 if (old_active)
866 bond_set_slave_inactive_flags(old_active,
867 BOND_SLAVE_NOTIFY_NOW);
868
869 if (new_active) {
870 bool should_notify_peers = false;
871
872 bond_set_slave_active_flags(new_active,
873 BOND_SLAVE_NOTIFY_NOW);
874
875 if (bond->params.fail_over_mac)
876 bond_do_fail_over_mac(bond, new_active,
877 old_active);
878
879 if (netif_running(bond->dev)) {
880 bond->send_peer_notif =
881 bond->params.num_peer_notif;
882 should_notify_peers =
883 bond_should_notify_peers(bond);
884 }
885
886 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
887 if (should_notify_peers)
888 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
889 bond->dev);
890 }
891 }
892
893 /* resend IGMP joins since active slave has changed or
894 * all were sent on curr_active_slave.
895 * resend only if bond is brought up with the affected
896 * bonding modes and the retransmission is enabled
897 */
898 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
899 ((bond_uses_primary(bond) && new_active) ||
900 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
901 bond->igmp_retrans = bond->params.resend_igmp;
902 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
903 }
904 }
905
906 /**
907 * bond_select_active_slave - select a new active slave, if needed
908 * @bond: our bonding struct
909 *
910 * This functions should be called when one of the following occurs:
911 * - The old curr_active_slave has been released or lost its link.
912 * - The primary_slave has got its link back.
913 * - A slave has got its link back and there's no old curr_active_slave.
914 *
915 * Caller must hold RTNL.
916 */
917 void bond_select_active_slave(struct bonding *bond)
918 {
919 struct slave *best_slave;
920 int rv;
921
922 ASSERT_RTNL();
923
924 best_slave = bond_find_best_slave(bond);
925 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
926 bond_change_active_slave(bond, best_slave);
927 rv = bond_set_carrier(bond);
928 if (!rv)
929 return;
930
931 if (netif_carrier_ok(bond->dev))
932 netdev_info(bond->dev, "first active interface up!\n");
933 else
934 netdev_info(bond->dev, "now running without any active interface!\n");
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 bond_for_each_slave_rcu(bond, slave, iter) {
983 ops = slave->dev->netdev_ops;
984 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
985 continue;
986
987 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
988 struct aggregator *agg =
989 SLAVE_AD_INFO(slave)->port.aggregator;
990
991 if (agg &&
992 agg->aggregator_identifier != ad_info.aggregator_id)
993 continue;
994 }
995
996 ni = rcu_dereference_bh(slave->dev->npinfo);
997 if (down_trylock(&ni->dev_lock))
998 continue;
999 ops->ndo_poll_controller(slave->dev);
1000 up(&ni->dev_lock);
1001 }
1002 }
1003
1004 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1005 {
1006 struct bonding *bond = netdev_priv(bond_dev);
1007 struct list_head *iter;
1008 struct slave *slave;
1009
1010 bond_for_each_slave(bond, slave, iter)
1011 if (bond_slave_is_up(slave))
1012 slave_disable_netpoll(slave);
1013 }
1014
1015 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1016 {
1017 struct bonding *bond = netdev_priv(dev);
1018 struct list_head *iter;
1019 struct slave *slave;
1020 int err = 0;
1021
1022 bond_for_each_slave(bond, slave, iter) {
1023 err = slave_enable_netpoll(slave);
1024 if (err) {
1025 bond_netpoll_cleanup(dev);
1026 break;
1027 }
1028 }
1029 return err;
1030 }
1031 #else
1032 static inline int slave_enable_netpoll(struct slave *slave)
1033 {
1034 return 0;
1035 }
1036 static inline void slave_disable_netpoll(struct slave *slave)
1037 {
1038 }
1039 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1040 {
1041 }
1042 #endif
1043
1044 /*---------------------------------- IOCTL ----------------------------------*/
1045
1046 static netdev_features_t bond_fix_features(struct net_device *dev,
1047 netdev_features_t features)
1048 {
1049 struct bonding *bond = netdev_priv(dev);
1050 struct list_head *iter;
1051 netdev_features_t mask;
1052 struct slave *slave;
1053
1054 mask = features;
1055
1056 features &= ~NETIF_F_ONE_FOR_ALL;
1057 features |= NETIF_F_ALL_FOR_ALL;
1058
1059 bond_for_each_slave(bond, slave, iter) {
1060 features = netdev_increment_features(features,
1061 slave->dev->features,
1062 mask);
1063 }
1064 features = netdev_add_tso_features(features, mask);
1065
1066 return features;
1067 }
1068
1069 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1070 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1071 NETIF_F_HIGHDMA | NETIF_F_LRO)
1072
1073 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1074 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1075
1076 static void bond_compute_features(struct bonding *bond)
1077 {
1078 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1079 IFF_XMIT_DST_RELEASE_PERM;
1080 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1081 netdev_features_t enc_features = BOND_ENC_FEATURES;
1082 struct net_device *bond_dev = bond->dev;
1083 struct list_head *iter;
1084 struct slave *slave;
1085 unsigned short max_hard_header_len = ETH_HLEN;
1086 unsigned int gso_max_size = GSO_MAX_SIZE;
1087 u16 gso_max_segs = GSO_MAX_SEGS;
1088
1089 if (!bond_has_slaves(bond))
1090 goto done;
1091 vlan_features &= NETIF_F_ALL_FOR_ALL;
1092
1093 bond_for_each_slave(bond, slave, iter) {
1094 vlan_features = netdev_increment_features(vlan_features,
1095 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1096
1097 enc_features = netdev_increment_features(enc_features,
1098 slave->dev->hw_enc_features,
1099 BOND_ENC_FEATURES);
1100 dst_release_flag &= slave->dev->priv_flags;
1101 if (slave->dev->hard_header_len > max_hard_header_len)
1102 max_hard_header_len = slave->dev->hard_header_len;
1103
1104 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1105 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1106 }
1107
1108 done:
1109 bond_dev->vlan_features = vlan_features;
1110 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1111 bond_dev->hard_header_len = max_hard_header_len;
1112 bond_dev->gso_max_segs = gso_max_segs;
1113 netif_set_gso_max_size(bond_dev, gso_max_size);
1114
1115 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1116 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1117 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1118 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1119
1120 netdev_change_features(bond_dev);
1121 }
1122
1123 static void bond_setup_by_slave(struct net_device *bond_dev,
1124 struct net_device *slave_dev)
1125 {
1126 bond_dev->header_ops = slave_dev->header_ops;
1127
1128 bond_dev->type = slave_dev->type;
1129 bond_dev->hard_header_len = slave_dev->hard_header_len;
1130 bond_dev->addr_len = slave_dev->addr_len;
1131
1132 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1133 slave_dev->addr_len);
1134 }
1135
1136 /* On bonding slaves other than the currently active slave, suppress
1137 * duplicates except for alb non-mcast/bcast.
1138 */
1139 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1140 struct slave *slave,
1141 struct bonding *bond)
1142 {
1143 if (bond_is_slave_inactive(slave)) {
1144 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1145 skb->pkt_type != PACKET_BROADCAST &&
1146 skb->pkt_type != PACKET_MULTICAST)
1147 return false;
1148 return true;
1149 }
1150 return false;
1151 }
1152
1153 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1154 {
1155 struct sk_buff *skb = *pskb;
1156 struct slave *slave;
1157 struct bonding *bond;
1158 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1159 struct slave *);
1160 int ret = RX_HANDLER_ANOTHER;
1161
1162 skb = skb_share_check(skb, GFP_ATOMIC);
1163 if (unlikely(!skb))
1164 return RX_HANDLER_CONSUMED;
1165
1166 *pskb = skb;
1167
1168 slave = bond_slave_get_rcu(skb->dev);
1169 bond = slave->bond;
1170
1171 recv_probe = ACCESS_ONCE(bond->recv_probe);
1172 if (recv_probe) {
1173 ret = recv_probe(skb, bond, slave);
1174 if (ret == RX_HANDLER_CONSUMED) {
1175 consume_skb(skb);
1176 return ret;
1177 }
1178 }
1179
1180 if (bond_should_deliver_exact_match(skb, slave, bond))
1181 return RX_HANDLER_EXACT;
1182
1183 skb->dev = bond->dev;
1184
1185 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1186 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1187 skb->pkt_type == PACKET_HOST) {
1188
1189 if (unlikely(skb_cow_head(skb,
1190 skb->data - skb_mac_header(skb)))) {
1191 kfree_skb(skb);
1192 return RX_HANDLER_CONSUMED;
1193 }
1194 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1195 }
1196
1197 return ret;
1198 }
1199
1200 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1201 {
1202 switch (BOND_MODE(bond)) {
1203 case BOND_MODE_ROUNDROBIN:
1204 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1205 case BOND_MODE_ACTIVEBACKUP:
1206 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1207 case BOND_MODE_BROADCAST:
1208 return NETDEV_LAG_TX_TYPE_BROADCAST;
1209 case BOND_MODE_XOR:
1210 case BOND_MODE_8023AD:
1211 return NETDEV_LAG_TX_TYPE_HASH;
1212 default:
1213 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1214 }
1215 }
1216
1217 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave)
1218 {
1219 struct netdev_lag_upper_info lag_upper_info;
1220 int err;
1221
1222 lag_upper_info.tx_type = bond_lag_tx_type(bond);
1223 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1224 &lag_upper_info);
1225 if (err)
1226 return err;
1227 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1228 return 0;
1229 }
1230
1231 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1232 {
1233 netdev_upper_dev_unlink(slave->dev, bond->dev);
1234 slave->dev->flags &= ~IFF_SLAVE;
1235 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1236 }
1237
1238 static struct slave *bond_alloc_slave(struct bonding *bond)
1239 {
1240 struct slave *slave = NULL;
1241
1242 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1243 if (!slave)
1244 return NULL;
1245
1246 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1247 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1248 GFP_KERNEL);
1249 if (!SLAVE_AD_INFO(slave)) {
1250 kfree(slave);
1251 return NULL;
1252 }
1253 }
1254 return slave;
1255 }
1256
1257 static void bond_free_slave(struct slave *slave)
1258 {
1259 struct bonding *bond = bond_get_bond_by_slave(slave);
1260
1261 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1262 kfree(SLAVE_AD_INFO(slave));
1263
1264 kfree(slave);
1265 }
1266
1267 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1268 {
1269 info->bond_mode = BOND_MODE(bond);
1270 info->miimon = bond->params.miimon;
1271 info->num_slaves = bond->slave_cnt;
1272 }
1273
1274 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1275 {
1276 strcpy(info->slave_name, slave->dev->name);
1277 info->link = slave->link;
1278 info->state = bond_slave_state(slave);
1279 info->link_failure_count = slave->link_failure_count;
1280 }
1281
1282 static void bond_netdev_notify(struct net_device *dev,
1283 struct netdev_bonding_info *info)
1284 {
1285 rtnl_lock();
1286 netdev_bonding_info_change(dev, info);
1287 rtnl_unlock();
1288 }
1289
1290 static void bond_netdev_notify_work(struct work_struct *_work)
1291 {
1292 struct netdev_notify_work *w =
1293 container_of(_work, struct netdev_notify_work, work.work);
1294
1295 bond_netdev_notify(w->dev, &w->bonding_info);
1296 dev_put(w->dev);
1297 kfree(w);
1298 }
1299
1300 void bond_queue_slave_event(struct slave *slave)
1301 {
1302 struct bonding *bond = slave->bond;
1303 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1304
1305 if (!nnw)
1306 return;
1307
1308 dev_hold(slave->dev);
1309 nnw->dev = slave->dev;
1310 bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1311 bond_fill_ifbond(bond, &nnw->bonding_info.master);
1312 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1313
1314 queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1315 }
1316
1317 void bond_lower_state_changed(struct slave *slave)
1318 {
1319 struct netdev_lag_lower_state_info info;
1320
1321 info.link_up = slave->link == BOND_LINK_UP ||
1322 slave->link == BOND_LINK_FAIL;
1323 info.tx_enabled = bond_is_active_slave(slave);
1324 netdev_lower_state_changed(slave->dev, &info);
1325 }
1326
1327 /* enslave device <slave> to bond device <master> */
1328 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1329 {
1330 struct bonding *bond = netdev_priv(bond_dev);
1331 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1332 struct slave *new_slave = NULL, *prev_slave;
1333 struct sockaddr addr;
1334 int link_reporting;
1335 int res = 0, i;
1336
1337 if (!bond->params.use_carrier &&
1338 slave_dev->ethtool_ops->get_link == NULL &&
1339 slave_ops->ndo_do_ioctl == NULL) {
1340 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1341 slave_dev->name);
1342 }
1343
1344 /* already enslaved */
1345 if (slave_dev->flags & IFF_SLAVE) {
1346 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1347 return -EBUSY;
1348 }
1349
1350 if (bond_dev == slave_dev) {
1351 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1352 return -EPERM;
1353 }
1354
1355 /* vlan challenged mutual exclusion */
1356 /* no need to lock since we're protected by rtnl_lock */
1357 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1358 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1359 slave_dev->name);
1360 if (vlan_uses_dev(bond_dev)) {
1361 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1362 slave_dev->name, bond_dev->name);
1363 return -EPERM;
1364 } else {
1365 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1366 slave_dev->name, slave_dev->name,
1367 bond_dev->name);
1368 }
1369 } else {
1370 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1371 slave_dev->name);
1372 }
1373
1374 /* Old ifenslave binaries are no longer supported. These can
1375 * be identified with moderate accuracy by the state of the slave:
1376 * the current ifenslave will set the interface down prior to
1377 * enslaving it; the old ifenslave will not.
1378 */
1379 if (slave_dev->flags & IFF_UP) {
1380 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1381 slave_dev->name);
1382 return -EPERM;
1383 }
1384
1385 /* set bonding device ether type by slave - bonding netdevices are
1386 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1387 * there is a need to override some of the type dependent attribs/funcs.
1388 *
1389 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1390 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1391 */
1392 if (!bond_has_slaves(bond)) {
1393 if (bond_dev->type != slave_dev->type) {
1394 netdev_dbg(bond_dev, "change device type from %d to %d\n",
1395 bond_dev->type, slave_dev->type);
1396
1397 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1398 bond_dev);
1399 res = notifier_to_errno(res);
1400 if (res) {
1401 netdev_err(bond_dev, "refused to change device type\n");
1402 return -EBUSY;
1403 }
1404
1405 /* Flush unicast and multicast addresses */
1406 dev_uc_flush(bond_dev);
1407 dev_mc_flush(bond_dev);
1408
1409 if (slave_dev->type != ARPHRD_ETHER)
1410 bond_setup_by_slave(bond_dev, slave_dev);
1411 else {
1412 ether_setup(bond_dev);
1413 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1414 }
1415
1416 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1417 bond_dev);
1418 }
1419 } else if (bond_dev->type != slave_dev->type) {
1420 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1421 slave_dev->name, slave_dev->type, bond_dev->type);
1422 return -EINVAL;
1423 }
1424
1425 if (slave_dev->type == ARPHRD_INFINIBAND &&
1426 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1427 netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n",
1428 slave_dev->type);
1429 res = -EOPNOTSUPP;
1430 goto err_undo_flags;
1431 }
1432
1433 if (!slave_ops->ndo_set_mac_address ||
1434 slave_dev->type == ARPHRD_INFINIBAND) {
1435 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1436 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1437 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1438 if (!bond_has_slaves(bond)) {
1439 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1440 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1441 } else {
1442 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");
1443 res = -EOPNOTSUPP;
1444 goto err_undo_flags;
1445 }
1446 }
1447 }
1448
1449 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1450
1451 /* If this is the first slave, then we need to set the master's hardware
1452 * address to be the same as the slave's.
1453 */
1454 if (!bond_has_slaves(bond) &&
1455 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1456 bond_set_dev_addr(bond->dev, slave_dev);
1457
1458 new_slave = bond_alloc_slave(bond);
1459 if (!new_slave) {
1460 res = -ENOMEM;
1461 goto err_undo_flags;
1462 }
1463
1464 new_slave->bond = bond;
1465 new_slave->dev = slave_dev;
1466 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1467 * is set via sysfs or module option if desired.
1468 */
1469 new_slave->queue_id = 0;
1470
1471 /* Save slave's original mtu and then set it to match the bond */
1472 new_slave->original_mtu = slave_dev->mtu;
1473 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1474 if (res) {
1475 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1476 goto err_free;
1477 }
1478
1479 /* Save slave's original ("permanent") mac address for modes
1480 * that need it, and for restoring it upon release, and then
1481 * set it to the master's address
1482 */
1483 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1484
1485 if (!bond->params.fail_over_mac ||
1486 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1487 /* Set slave to master's mac address. The application already
1488 * set the master's mac address to that of the first slave
1489 */
1490 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1491 addr.sa_family = slave_dev->type;
1492 res = dev_set_mac_address(slave_dev, &addr);
1493 if (res) {
1494 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1495 goto err_restore_mtu;
1496 }
1497 }
1498
1499 /* set slave flag before open to prevent IPv6 addrconf */
1500 slave_dev->flags |= IFF_SLAVE;
1501
1502 /* open the slave since the application closed it */
1503 res = dev_open(slave_dev);
1504 if (res) {
1505 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1506 goto err_restore_mac;
1507 }
1508
1509 slave_dev->priv_flags |= IFF_BONDING;
1510 /* initialize slave stats */
1511 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1512
1513 if (bond_is_lb(bond)) {
1514 /* bond_alb_init_slave() must be called before all other stages since
1515 * it might fail and we do not want to have to undo everything
1516 */
1517 res = bond_alb_init_slave(bond, new_slave);
1518 if (res)
1519 goto err_close;
1520 }
1521
1522 /* If the mode uses primary, then the following is handled by
1523 * bond_change_active_slave().
1524 */
1525 if (!bond_uses_primary(bond)) {
1526 /* set promiscuity level to new slave */
1527 if (bond_dev->flags & IFF_PROMISC) {
1528 res = dev_set_promiscuity(slave_dev, 1);
1529 if (res)
1530 goto err_close;
1531 }
1532
1533 /* set allmulti level to new slave */
1534 if (bond_dev->flags & IFF_ALLMULTI) {
1535 res = dev_set_allmulti(slave_dev, 1);
1536 if (res)
1537 goto err_close;
1538 }
1539
1540 netif_addr_lock_bh(bond_dev);
1541
1542 dev_mc_sync_multiple(slave_dev, bond_dev);
1543 dev_uc_sync_multiple(slave_dev, bond_dev);
1544
1545 netif_addr_unlock_bh(bond_dev);
1546 }
1547
1548 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1549 /* add lacpdu mc addr to mc list */
1550 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1551
1552 dev_mc_add(slave_dev, lacpdu_multicast);
1553 }
1554
1555 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1556 if (res) {
1557 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1558 slave_dev->name);
1559 goto err_close;
1560 }
1561
1562 prev_slave = bond_last_slave(bond);
1563
1564 new_slave->delay = 0;
1565 new_slave->link_failure_count = 0;
1566
1567 bond_update_speed_duplex(new_slave);
1568
1569 new_slave->last_rx = jiffies -
1570 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1571 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1572 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1573
1574 if (bond->params.miimon && !bond->params.use_carrier) {
1575 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1576
1577 if ((link_reporting == -1) && !bond->params.arp_interval) {
1578 /* miimon is set but a bonded network driver
1579 * does not support ETHTOOL/MII and
1580 * arp_interval is not set. Note: if
1581 * use_carrier is enabled, we will never go
1582 * here (because netif_carrier is always
1583 * supported); thus, we don't need to change
1584 * the messages for netif_carrier.
1585 */
1586 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",
1587 slave_dev->name);
1588 } else if (link_reporting == -1) {
1589 /* unable get link status using mii/ethtool */
1590 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",
1591 slave_dev->name);
1592 }
1593 }
1594
1595 /* check for initial state */
1596 new_slave->link = BOND_LINK_NOCHANGE;
1597 if (bond->params.miimon) {
1598 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1599 if (bond->params.updelay) {
1600 bond_set_slave_link_state(new_slave,
1601 BOND_LINK_BACK,
1602 BOND_SLAVE_NOTIFY_NOW);
1603 new_slave->delay = bond->params.updelay;
1604 } else {
1605 bond_set_slave_link_state(new_slave,
1606 BOND_LINK_UP,
1607 BOND_SLAVE_NOTIFY_NOW);
1608 }
1609 } else {
1610 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1611 BOND_SLAVE_NOTIFY_NOW);
1612 }
1613 } else if (bond->params.arp_interval) {
1614 bond_set_slave_link_state(new_slave,
1615 (netif_carrier_ok(slave_dev) ?
1616 BOND_LINK_UP : BOND_LINK_DOWN),
1617 BOND_SLAVE_NOTIFY_NOW);
1618 } else {
1619 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1620 BOND_SLAVE_NOTIFY_NOW);
1621 }
1622
1623 if (new_slave->link != BOND_LINK_DOWN)
1624 new_slave->last_link_up = jiffies;
1625 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1626 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1627 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1628
1629 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1630 /* if there is a primary slave, remember it */
1631 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1632 rcu_assign_pointer(bond->primary_slave, new_slave);
1633 bond->force_primary = true;
1634 }
1635 }
1636
1637 switch (BOND_MODE(bond)) {
1638 case BOND_MODE_ACTIVEBACKUP:
1639 bond_set_slave_inactive_flags(new_slave,
1640 BOND_SLAVE_NOTIFY_NOW);
1641 break;
1642 case BOND_MODE_8023AD:
1643 /* in 802.3ad mode, the internal mechanism
1644 * will activate the slaves in the selected
1645 * aggregator
1646 */
1647 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1648 /* if this is the first slave */
1649 if (!prev_slave) {
1650 SLAVE_AD_INFO(new_slave)->id = 1;
1651 /* Initialize AD with the number of times that the AD timer is called in 1 second
1652 * can be called only after the mac address of the bond is set
1653 */
1654 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1655 } else {
1656 SLAVE_AD_INFO(new_slave)->id =
1657 SLAVE_AD_INFO(prev_slave)->id + 1;
1658 }
1659
1660 bond_3ad_bind_slave(new_slave);
1661 break;
1662 case BOND_MODE_TLB:
1663 case BOND_MODE_ALB:
1664 bond_set_active_slave(new_slave);
1665 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1666 break;
1667 default:
1668 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1669
1670 /* always active in trunk mode */
1671 bond_set_active_slave(new_slave);
1672
1673 /* In trunking mode there is little meaning to curr_active_slave
1674 * anyway (it holds no special properties of the bond device),
1675 * so we can change it without calling change_active_interface()
1676 */
1677 if (!rcu_access_pointer(bond->curr_active_slave) &&
1678 new_slave->link == BOND_LINK_UP)
1679 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1680
1681 break;
1682 } /* switch(bond_mode) */
1683
1684 #ifdef CONFIG_NET_POLL_CONTROLLER
1685 slave_dev->npinfo = bond->dev->npinfo;
1686 if (slave_dev->npinfo) {
1687 if (slave_enable_netpoll(new_slave)) {
1688 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1689 res = -EBUSY;
1690 goto err_detach;
1691 }
1692 }
1693 #endif
1694
1695 if (!(bond_dev->features & NETIF_F_LRO))
1696 dev_disable_lro(slave_dev);
1697
1698 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1699 new_slave);
1700 if (res) {
1701 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1702 goto err_detach;
1703 }
1704
1705 res = bond_master_upper_dev_link(bond, new_slave);
1706 if (res) {
1707 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1708 goto err_unregister;
1709 }
1710
1711 res = bond_sysfs_slave_add(new_slave);
1712 if (res) {
1713 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1714 goto err_upper_unlink;
1715 }
1716
1717 bond->slave_cnt++;
1718 bond_compute_features(bond);
1719 bond_set_carrier(bond);
1720
1721 if (bond_uses_primary(bond)) {
1722 block_netpoll_tx();
1723 bond_select_active_slave(bond);
1724 unblock_netpoll_tx();
1725 }
1726
1727 if (bond_mode_uses_xmit_hash(bond))
1728 bond_update_slave_arr(bond, NULL);
1729
1730 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1731 slave_dev->name,
1732 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1733 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1734
1735 /* enslave is successful */
1736 bond_queue_slave_event(new_slave);
1737 return 0;
1738
1739 /* Undo stages on error */
1740 err_upper_unlink:
1741 bond_upper_dev_unlink(bond, new_slave);
1742
1743 err_unregister:
1744 netdev_rx_handler_unregister(slave_dev);
1745
1746 err_detach:
1747 if (!bond_uses_primary(bond))
1748 bond_hw_addr_flush(bond_dev, slave_dev);
1749
1750 vlan_vids_del_by_dev(slave_dev, bond_dev);
1751 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1752 RCU_INIT_POINTER(bond->primary_slave, NULL);
1753 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1754 block_netpoll_tx();
1755 bond_change_active_slave(bond, NULL);
1756 bond_select_active_slave(bond);
1757 unblock_netpoll_tx();
1758 }
1759 /* either primary_slave or curr_active_slave might've changed */
1760 synchronize_rcu();
1761 slave_disable_netpoll(new_slave);
1762
1763 err_close:
1764 slave_dev->priv_flags &= ~IFF_BONDING;
1765 dev_close(slave_dev);
1766
1767 err_restore_mac:
1768 slave_dev->flags &= ~IFF_SLAVE;
1769 if (!bond->params.fail_over_mac ||
1770 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1771 /* XXX TODO - fom follow mode needs to change master's
1772 * MAC if this slave's MAC is in use by the bond, or at
1773 * least print a warning.
1774 */
1775 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1776 addr.sa_family = slave_dev->type;
1777 dev_set_mac_address(slave_dev, &addr);
1778 }
1779
1780 err_restore_mtu:
1781 dev_set_mtu(slave_dev, new_slave->original_mtu);
1782
1783 err_free:
1784 bond_free_slave(new_slave);
1785
1786 err_undo_flags:
1787 /* Enslave of first slave has failed and we need to fix master's mac */
1788 if (!bond_has_slaves(bond)) {
1789 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1790 slave_dev->dev_addr))
1791 eth_hw_addr_random(bond_dev);
1792 if (bond_dev->type != ARPHRD_ETHER) {
1793 dev_close(bond_dev);
1794 ether_setup(bond_dev);
1795 bond_dev->flags |= IFF_MASTER;
1796 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1797 }
1798 }
1799
1800 return res;
1801 }
1802
1803 /* Try to release the slave device <slave> from the bond device <master>
1804 * It is legal to access curr_active_slave without a lock because all the function
1805 * is RTNL-locked. If "all" is true it means that the function is being called
1806 * while destroying a bond interface and all slaves are being released.
1807 *
1808 * The rules for slave state should be:
1809 * for Active/Backup:
1810 * Active stays on all backups go down
1811 * for Bonded connections:
1812 * The first up interface should be left on and all others downed.
1813 */
1814 static int __bond_release_one(struct net_device *bond_dev,
1815 struct net_device *slave_dev,
1816 bool all)
1817 {
1818 struct bonding *bond = netdev_priv(bond_dev);
1819 struct slave *slave, *oldcurrent;
1820 struct sockaddr addr;
1821 int old_flags = bond_dev->flags;
1822 netdev_features_t old_features = bond_dev->features;
1823
1824 /* slave is not a slave or master is not master of this slave */
1825 if (!(slave_dev->flags & IFF_SLAVE) ||
1826 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1827 netdev_dbg(bond_dev, "cannot release %s\n",
1828 slave_dev->name);
1829 return -EINVAL;
1830 }
1831
1832 block_netpoll_tx();
1833
1834 slave = bond_get_slave_by_dev(bond, slave_dev);
1835 if (!slave) {
1836 /* not a slave of this bond */
1837 netdev_info(bond_dev, "%s not enslaved\n",
1838 slave_dev->name);
1839 unblock_netpoll_tx();
1840 return -EINVAL;
1841 }
1842
1843 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1844
1845 bond_sysfs_slave_del(slave);
1846
1847 /* recompute stats just before removing the slave */
1848 bond_get_stats(bond->dev, &bond->bond_stats);
1849
1850 bond_upper_dev_unlink(bond, slave);
1851 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1852 * for this slave anymore.
1853 */
1854 netdev_rx_handler_unregister(slave_dev);
1855
1856 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1857 bond_3ad_unbind_slave(slave);
1858
1859 if (bond_mode_uses_xmit_hash(bond))
1860 bond_update_slave_arr(bond, slave);
1861
1862 netdev_info(bond_dev, "Releasing %s interface %s\n",
1863 bond_is_active_slave(slave) ? "active" : "backup",
1864 slave_dev->name);
1865
1866 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1867
1868 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1869
1870 if (!all && (!bond->params.fail_over_mac ||
1871 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1872 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1873 bond_has_slaves(bond))
1874 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",
1875 slave_dev->name, slave->perm_hwaddr,
1876 bond_dev->name, slave_dev->name);
1877 }
1878
1879 if (rtnl_dereference(bond->primary_slave) == slave)
1880 RCU_INIT_POINTER(bond->primary_slave, NULL);
1881
1882 if (oldcurrent == slave)
1883 bond_change_active_slave(bond, NULL);
1884
1885 if (bond_is_lb(bond)) {
1886 /* Must be called only after the slave has been
1887 * detached from the list and the curr_active_slave
1888 * has been cleared (if our_slave == old_current),
1889 * but before a new active slave is selected.
1890 */
1891 bond_alb_deinit_slave(bond, slave);
1892 }
1893
1894 if (all) {
1895 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1896 } else if (oldcurrent == slave) {
1897 /* Note that we hold RTNL over this sequence, so there
1898 * is no concern that another slave add/remove event
1899 * will interfere.
1900 */
1901 bond_select_active_slave(bond);
1902 }
1903
1904 if (!bond_has_slaves(bond)) {
1905 bond_set_carrier(bond);
1906 eth_hw_addr_random(bond_dev);
1907 }
1908
1909 unblock_netpoll_tx();
1910 synchronize_rcu();
1911 bond->slave_cnt--;
1912
1913 if (!bond_has_slaves(bond)) {
1914 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1915 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1916 }
1917
1918 bond_compute_features(bond);
1919 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1920 (old_features & NETIF_F_VLAN_CHALLENGED))
1921 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1922 slave_dev->name, bond_dev->name);
1923
1924 vlan_vids_del_by_dev(slave_dev, bond_dev);
1925
1926 /* If the mode uses primary, then this case was handled above by
1927 * bond_change_active_slave(..., NULL)
1928 */
1929 if (!bond_uses_primary(bond)) {
1930 /* unset promiscuity level from slave
1931 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1932 * of the IFF_PROMISC flag in the bond_dev, but we need the
1933 * value of that flag before that change, as that was the value
1934 * when this slave was attached, so we cache at the start of the
1935 * function and use it here. Same goes for ALLMULTI below
1936 */
1937 if (old_flags & IFF_PROMISC)
1938 dev_set_promiscuity(slave_dev, -1);
1939
1940 /* unset allmulti level from slave */
1941 if (old_flags & IFF_ALLMULTI)
1942 dev_set_allmulti(slave_dev, -1);
1943
1944 bond_hw_addr_flush(bond_dev, slave_dev);
1945 }
1946
1947 slave_disable_netpoll(slave);
1948
1949 /* close slave before restoring its mac address */
1950 dev_close(slave_dev);
1951
1952 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1953 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1954 /* restore original ("permanent") mac address */
1955 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1956 addr.sa_family = slave_dev->type;
1957 dev_set_mac_address(slave_dev, &addr);
1958 }
1959
1960 dev_set_mtu(slave_dev, slave->original_mtu);
1961
1962 slave_dev->priv_flags &= ~IFF_BONDING;
1963
1964 bond_free_slave(slave);
1965
1966 return 0;
1967 }
1968
1969 /* A wrapper used because of ndo_del_link */
1970 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1971 {
1972 return __bond_release_one(bond_dev, slave_dev, false);
1973 }
1974
1975 /* First release a slave and then destroy the bond if no more slaves are left.
1976 * Must be under rtnl_lock when this function is called.
1977 */
1978 static int bond_release_and_destroy(struct net_device *bond_dev,
1979 struct net_device *slave_dev)
1980 {
1981 struct bonding *bond = netdev_priv(bond_dev);
1982 int ret;
1983
1984 ret = bond_release(bond_dev, slave_dev);
1985 if (ret == 0 && !bond_has_slaves(bond)) {
1986 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1987 netdev_info(bond_dev, "Destroying bond %s\n",
1988 bond_dev->name);
1989 bond_remove_proc_entry(bond);
1990 unregister_netdevice(bond_dev);
1991 }
1992 return ret;
1993 }
1994
1995 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1996 {
1997 struct bonding *bond = netdev_priv(bond_dev);
1998 bond_fill_ifbond(bond, info);
1999 return 0;
2000 }
2001
2002 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2003 {
2004 struct bonding *bond = netdev_priv(bond_dev);
2005 struct list_head *iter;
2006 int i = 0, res = -ENODEV;
2007 struct slave *slave;
2008
2009 bond_for_each_slave(bond, slave, iter) {
2010 if (i++ == (int)info->slave_id) {
2011 res = 0;
2012 bond_fill_ifslave(slave, info);
2013 break;
2014 }
2015 }
2016
2017 return res;
2018 }
2019
2020 /*-------------------------------- Monitoring -------------------------------*/
2021
2022 /* called with rcu_read_lock() */
2023 static int bond_miimon_inspect(struct bonding *bond)
2024 {
2025 int link_state, commit = 0;
2026 struct list_head *iter;
2027 struct slave *slave;
2028 bool ignore_updelay;
2029
2030 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2031
2032 bond_for_each_slave_rcu(bond, slave, iter) {
2033 slave->new_link = BOND_LINK_NOCHANGE;
2034
2035 link_state = bond_check_dev_link(bond, slave->dev, 0);
2036
2037 switch (slave->link) {
2038 case BOND_LINK_UP:
2039 if (link_state)
2040 continue;
2041
2042 bond_set_slave_link_state(slave, BOND_LINK_FAIL,
2043 BOND_SLAVE_NOTIFY_LATER);
2044 slave->delay = bond->params.downdelay;
2045 if (slave->delay) {
2046 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2047 (BOND_MODE(bond) ==
2048 BOND_MODE_ACTIVEBACKUP) ?
2049 (bond_is_active_slave(slave) ?
2050 "active " : "backup ") : "",
2051 slave->dev->name,
2052 bond->params.downdelay * bond->params.miimon);
2053 }
2054 /*FALLTHRU*/
2055 case BOND_LINK_FAIL:
2056 if (link_state) {
2057 /* recovered before downdelay expired */
2058 bond_set_slave_link_state(slave, BOND_LINK_UP,
2059 BOND_SLAVE_NOTIFY_LATER);
2060 slave->last_link_up = jiffies;
2061 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2062 (bond->params.downdelay - slave->delay) *
2063 bond->params.miimon,
2064 slave->dev->name);
2065 continue;
2066 }
2067
2068 if (slave->delay <= 0) {
2069 slave->new_link = BOND_LINK_DOWN;
2070 commit++;
2071 continue;
2072 }
2073
2074 slave->delay--;
2075 break;
2076
2077 case BOND_LINK_DOWN:
2078 if (!link_state)
2079 continue;
2080
2081 bond_set_slave_link_state(slave, BOND_LINK_BACK,
2082 BOND_SLAVE_NOTIFY_LATER);
2083 slave->delay = bond->params.updelay;
2084
2085 if (slave->delay) {
2086 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2087 slave->dev->name,
2088 ignore_updelay ? 0 :
2089 bond->params.updelay *
2090 bond->params.miimon);
2091 }
2092 /*FALLTHRU*/
2093 case BOND_LINK_BACK:
2094 if (!link_state) {
2095 bond_set_slave_link_state(slave,
2096 BOND_LINK_DOWN,
2097 BOND_SLAVE_NOTIFY_LATER);
2098 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2099 (bond->params.updelay - slave->delay) *
2100 bond->params.miimon,
2101 slave->dev->name);
2102
2103 continue;
2104 }
2105
2106 if (ignore_updelay)
2107 slave->delay = 0;
2108
2109 if (slave->delay <= 0) {
2110 slave->new_link = BOND_LINK_UP;
2111 commit++;
2112 ignore_updelay = false;
2113 continue;
2114 }
2115
2116 slave->delay--;
2117 break;
2118 }
2119 }
2120
2121 return commit;
2122 }
2123
2124 static void bond_miimon_commit(struct bonding *bond)
2125 {
2126 struct list_head *iter;
2127 struct slave *slave, *primary;
2128
2129 bond_for_each_slave(bond, slave, iter) {
2130 switch (slave->new_link) {
2131 case BOND_LINK_NOCHANGE:
2132 continue;
2133
2134 case BOND_LINK_UP:
2135 bond_update_speed_duplex(slave);
2136 bond_set_slave_link_state(slave, BOND_LINK_UP,
2137 BOND_SLAVE_NOTIFY_NOW);
2138 slave->last_link_up = jiffies;
2139
2140 primary = rtnl_dereference(bond->primary_slave);
2141 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2142 /* prevent it from being the active one */
2143 bond_set_backup_slave(slave);
2144 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2145 /* make it immediately active */
2146 bond_set_active_slave(slave);
2147 } else if (slave != primary) {
2148 /* prevent it from being the active one */
2149 bond_set_backup_slave(slave);
2150 }
2151
2152 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2153 slave->dev->name,
2154 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2155 slave->duplex ? "full" : "half");
2156
2157 /* notify ad that the link status has changed */
2158 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2159 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2160
2161 if (bond_is_lb(bond))
2162 bond_alb_handle_link_change(bond, slave,
2163 BOND_LINK_UP);
2164
2165 if (BOND_MODE(bond) == BOND_MODE_XOR)
2166 bond_update_slave_arr(bond, NULL);
2167
2168 if (!bond->curr_active_slave || slave == primary)
2169 goto do_failover;
2170
2171 continue;
2172
2173 case BOND_LINK_DOWN:
2174 if (slave->link_failure_count < UINT_MAX)
2175 slave->link_failure_count++;
2176
2177 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2178 BOND_SLAVE_NOTIFY_NOW);
2179
2180 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2181 BOND_MODE(bond) == BOND_MODE_8023AD)
2182 bond_set_slave_inactive_flags(slave,
2183 BOND_SLAVE_NOTIFY_NOW);
2184
2185 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2186 slave->dev->name);
2187
2188 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2189 bond_3ad_handle_link_change(slave,
2190 BOND_LINK_DOWN);
2191
2192 if (bond_is_lb(bond))
2193 bond_alb_handle_link_change(bond, slave,
2194 BOND_LINK_DOWN);
2195
2196 if (BOND_MODE(bond) == BOND_MODE_XOR)
2197 bond_update_slave_arr(bond, NULL);
2198
2199 if (slave == rcu_access_pointer(bond->curr_active_slave))
2200 goto do_failover;
2201
2202 continue;
2203
2204 default:
2205 netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2206 slave->new_link, slave->dev->name);
2207 slave->new_link = BOND_LINK_NOCHANGE;
2208
2209 continue;
2210 }
2211
2212 do_failover:
2213 block_netpoll_tx();
2214 bond_select_active_slave(bond);
2215 unblock_netpoll_tx();
2216 }
2217
2218 bond_set_carrier(bond);
2219 }
2220
2221 /* bond_mii_monitor
2222 *
2223 * Really a wrapper that splits the mii monitor into two phases: an
2224 * inspection, then (if inspection indicates something needs to be done)
2225 * an acquisition of appropriate locks followed by a commit phase to
2226 * implement whatever link state changes are indicated.
2227 */
2228 static void bond_mii_monitor(struct work_struct *work)
2229 {
2230 struct bonding *bond = container_of(work, struct bonding,
2231 mii_work.work);
2232 bool should_notify_peers = false;
2233 unsigned long delay;
2234
2235 delay = msecs_to_jiffies(bond->params.miimon);
2236
2237 if (!bond_has_slaves(bond))
2238 goto re_arm;
2239
2240 rcu_read_lock();
2241
2242 should_notify_peers = bond_should_notify_peers(bond);
2243
2244 if (bond_miimon_inspect(bond)) {
2245 rcu_read_unlock();
2246
2247 /* Race avoidance with bond_close cancel of workqueue */
2248 if (!rtnl_trylock()) {
2249 delay = 1;
2250 should_notify_peers = false;
2251 goto re_arm;
2252 }
2253
2254 bond_miimon_commit(bond);
2255
2256 rtnl_unlock(); /* might sleep, hold no other locks */
2257 } else
2258 rcu_read_unlock();
2259
2260 re_arm:
2261 if (bond->params.miimon)
2262 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2263
2264 if (should_notify_peers) {
2265 if (!rtnl_trylock())
2266 return;
2267 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2268 rtnl_unlock();
2269 }
2270 }
2271
2272 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2273 {
2274 struct net_device *upper;
2275 struct list_head *iter;
2276 bool ret = false;
2277
2278 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2279 return true;
2280
2281 rcu_read_lock();
2282 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2283 if (ip == bond_confirm_addr(upper, 0, ip)) {
2284 ret = true;
2285 break;
2286 }
2287 }
2288 rcu_read_unlock();
2289
2290 return ret;
2291 }
2292
2293 /* We go to the (large) trouble of VLAN tagging ARP frames because
2294 * switches in VLAN mode (especially if ports are configured as
2295 * "native" to a VLAN) might not pass non-tagged frames.
2296 */
2297 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2298 __be32 dest_ip, __be32 src_ip,
2299 struct bond_vlan_tag *tags)
2300 {
2301 struct sk_buff *skb;
2302 struct bond_vlan_tag *outer_tag = tags;
2303
2304 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2305 arp_op, slave_dev->name, &dest_ip, &src_ip);
2306
2307 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2308 NULL, slave_dev->dev_addr, NULL);
2309
2310 if (!skb) {
2311 net_err_ratelimited("ARP packet allocation failed\n");
2312 return;
2313 }
2314
2315 if (!tags || tags->vlan_proto == VLAN_N_VID)
2316 goto xmit;
2317
2318 tags++;
2319
2320 /* Go through all the tags backwards and add them to the packet */
2321 while (tags->vlan_proto != VLAN_N_VID) {
2322 if (!tags->vlan_id) {
2323 tags++;
2324 continue;
2325 }
2326
2327 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2328 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2329 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2330 tags->vlan_id);
2331 if (!skb) {
2332 net_err_ratelimited("failed to insert inner VLAN tag\n");
2333 return;
2334 }
2335
2336 tags++;
2337 }
2338 /* Set the outer tag */
2339 if (outer_tag->vlan_id) {
2340 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2341 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2342 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2343 outer_tag->vlan_id);
2344 }
2345
2346 xmit:
2347 arp_xmit(skb);
2348 }
2349
2350 /* Validate the device path between the @start_dev and the @end_dev.
2351 * The path is valid if the @end_dev is reachable through device
2352 * stacking.
2353 * When the path is validated, collect any vlan information in the
2354 * path.
2355 */
2356 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2357 struct net_device *end_dev,
2358 int level)
2359 {
2360 struct bond_vlan_tag *tags;
2361 struct net_device *upper;
2362 struct list_head *iter;
2363
2364 if (start_dev == end_dev) {
2365 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2366 if (!tags)
2367 return ERR_PTR(-ENOMEM);
2368 tags[level].vlan_proto = VLAN_N_VID;
2369 return tags;
2370 }
2371
2372 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2373 tags = bond_verify_device_path(upper, end_dev, level + 1);
2374 if (IS_ERR_OR_NULL(tags)) {
2375 if (IS_ERR(tags))
2376 return tags;
2377 continue;
2378 }
2379 if (is_vlan_dev(upper)) {
2380 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2381 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2382 }
2383
2384 return tags;
2385 }
2386
2387 return NULL;
2388 }
2389
2390 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2391 {
2392 struct rtable *rt;
2393 struct bond_vlan_tag *tags;
2394 __be32 *targets = bond->params.arp_targets, addr;
2395 int i;
2396
2397 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2398 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2399 tags = NULL;
2400
2401 /* Find out through which dev should the packet go */
2402 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2403 RTO_ONLINK, 0);
2404 if (IS_ERR(rt)) {
2405 /* there's no route to target - try to send arp
2406 * probe to generate any traffic (arp_validate=0)
2407 */
2408 if (bond->params.arp_validate)
2409 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2410 bond->dev->name,
2411 &targets[i]);
2412 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2413 0, tags);
2414 continue;
2415 }
2416
2417 /* bond device itself */
2418 if (rt->dst.dev == bond->dev)
2419 goto found;
2420
2421 rcu_read_lock();
2422 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2423 rcu_read_unlock();
2424
2425 if (!IS_ERR_OR_NULL(tags))
2426 goto found;
2427
2428 /* Not our device - skip */
2429 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2430 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2431
2432 ip_rt_put(rt);
2433 continue;
2434
2435 found:
2436 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2437 ip_rt_put(rt);
2438 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2439 addr, tags);
2440 kfree(tags);
2441 }
2442 }
2443
2444 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2445 {
2446 int i;
2447
2448 if (!sip || !bond_has_this_ip(bond, tip)) {
2449 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2450 &sip, &tip);
2451 return;
2452 }
2453
2454 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2455 if (i == -1) {
2456 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2457 &sip);
2458 return;
2459 }
2460 slave->last_rx = jiffies;
2461 slave->target_last_arp_rx[i] = jiffies;
2462 }
2463
2464 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2465 struct slave *slave)
2466 {
2467 struct arphdr *arp = (struct arphdr *)skb->data;
2468 struct slave *curr_active_slave, *curr_arp_slave;
2469 unsigned char *arp_ptr;
2470 __be32 sip, tip;
2471 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2472
2473 if (!slave_do_arp_validate(bond, slave)) {
2474 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2475 !slave_do_arp_validate_only(bond))
2476 slave->last_rx = jiffies;
2477 return RX_HANDLER_ANOTHER;
2478 } else if (!is_arp) {
2479 return RX_HANDLER_ANOTHER;
2480 }
2481
2482 alen = arp_hdr_len(bond->dev);
2483
2484 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2485 skb->dev->name);
2486
2487 if (alen > skb_headlen(skb)) {
2488 arp = kmalloc(alen, GFP_ATOMIC);
2489 if (!arp)
2490 goto out_unlock;
2491 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2492 goto out_unlock;
2493 }
2494
2495 if (arp->ar_hln != bond->dev->addr_len ||
2496 skb->pkt_type == PACKET_OTHERHOST ||
2497 skb->pkt_type == PACKET_LOOPBACK ||
2498 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2499 arp->ar_pro != htons(ETH_P_IP) ||
2500 arp->ar_pln != 4)
2501 goto out_unlock;
2502
2503 arp_ptr = (unsigned char *)(arp + 1);
2504 arp_ptr += bond->dev->addr_len;
2505 memcpy(&sip, arp_ptr, 4);
2506 arp_ptr += 4 + bond->dev->addr_len;
2507 memcpy(&tip, arp_ptr, 4);
2508
2509 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2510 slave->dev->name, bond_slave_state(slave),
2511 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2512 &sip, &tip);
2513
2514 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2515 curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2516
2517 /* We 'trust' the received ARP enough to validate it if:
2518 *
2519 * (a) the slave receiving the ARP is active (which includes the
2520 * current ARP slave, if any), or
2521 *
2522 * (b) the receiving slave isn't active, but there is a currently
2523 * active slave and it received valid arp reply(s) after it became
2524 * the currently active slave, or
2525 *
2526 * (c) there is an ARP slave that sent an ARP during the prior ARP
2527 * interval, and we receive an ARP reply on any slave. We accept
2528 * these because switch FDB update delays may deliver the ARP
2529 * reply to a slave other than the sender of the ARP request.
2530 *
2531 * Note: for (b), backup slaves are receiving the broadcast ARP
2532 * request, not a reply. This request passes from the sending
2533 * slave through the L2 switch(es) to the receiving slave. Since
2534 * this is checking the request, sip/tip are swapped for
2535 * validation.
2536 *
2537 * This is done to avoid endless looping when we can't reach the
2538 * arp_ip_target and fool ourselves with our own arp requests.
2539 */
2540 if (bond_is_active_slave(slave))
2541 bond_validate_arp(bond, slave, sip, tip);
2542 else if (curr_active_slave &&
2543 time_after(slave_last_rx(bond, curr_active_slave),
2544 curr_active_slave->last_link_up))
2545 bond_validate_arp(bond, slave, tip, sip);
2546 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2547 bond_time_in_interval(bond,
2548 dev_trans_start(curr_arp_slave->dev), 1))
2549 bond_validate_arp(bond, slave, sip, tip);
2550
2551 out_unlock:
2552 if (arp != (struct arphdr *)skb->data)
2553 kfree(arp);
2554 return RX_HANDLER_ANOTHER;
2555 }
2556
2557 /* function to verify if we're in the arp_interval timeslice, returns true if
2558 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2559 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2560 */
2561 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2562 int mod)
2563 {
2564 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2565
2566 return time_in_range(jiffies,
2567 last_act - delta_in_ticks,
2568 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2569 }
2570
2571 /* This function is called regularly to monitor each slave's link
2572 * ensuring that traffic is being sent and received when arp monitoring
2573 * is used in load-balancing mode. if the adapter has been dormant, then an
2574 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2575 * arp monitoring in active backup mode.
2576 */
2577 static void bond_loadbalance_arp_mon(struct work_struct *work)
2578 {
2579 struct bonding *bond = container_of(work, struct bonding,
2580 arp_work.work);
2581 struct slave *slave, *oldcurrent;
2582 struct list_head *iter;
2583 int do_failover = 0, slave_state_changed = 0;
2584
2585 if (!bond_has_slaves(bond))
2586 goto re_arm;
2587
2588 rcu_read_lock();
2589
2590 oldcurrent = rcu_dereference(bond->curr_active_slave);
2591 /* see if any of the previous devices are up now (i.e. they have
2592 * xmt and rcv traffic). the curr_active_slave does not come into
2593 * the picture unless it is null. also, slave->last_link_up is not
2594 * needed here because we send an arp on each slave and give a slave
2595 * as long as it needs to get the tx/rx within the delta.
2596 * TODO: what about up/down delay in arp mode? it wasn't here before
2597 * so it can wait
2598 */
2599 bond_for_each_slave_rcu(bond, slave, iter) {
2600 unsigned long trans_start = dev_trans_start(slave->dev);
2601
2602 if (slave->link != BOND_LINK_UP) {
2603 if (bond_time_in_interval(bond, trans_start, 1) &&
2604 bond_time_in_interval(bond, slave->last_rx, 1)) {
2605
2606 slave->link = BOND_LINK_UP;
2607 slave_state_changed = 1;
2608
2609 /* primary_slave has no meaning in round-robin
2610 * mode. the window of a slave being up and
2611 * curr_active_slave being null after enslaving
2612 * is closed.
2613 */
2614 if (!oldcurrent) {
2615 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2616 slave->dev->name);
2617 do_failover = 1;
2618 } else {
2619 netdev_info(bond->dev, "interface %s is now up\n",
2620 slave->dev->name);
2621 }
2622 }
2623 } else {
2624 /* slave->link == BOND_LINK_UP */
2625
2626 /* not all switches will respond to an arp request
2627 * when the source ip is 0, so don't take the link down
2628 * if we don't know our ip yet
2629 */
2630 if (!bond_time_in_interval(bond, trans_start, 2) ||
2631 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2632
2633 slave->link = BOND_LINK_DOWN;
2634 slave_state_changed = 1;
2635
2636 if (slave->link_failure_count < UINT_MAX)
2637 slave->link_failure_count++;
2638
2639 netdev_info(bond->dev, "interface %s is now down\n",
2640 slave->dev->name);
2641
2642 if (slave == oldcurrent)
2643 do_failover = 1;
2644 }
2645 }
2646
2647 /* note: if switch is in round-robin mode, all links
2648 * must tx arp to ensure all links rx an arp - otherwise
2649 * links may oscillate or not come up at all; if switch is
2650 * in something like xor mode, there is nothing we can
2651 * do - all replies will be rx'ed on same link causing slaves
2652 * to be unstable during low/no traffic periods
2653 */
2654 if (bond_slave_is_up(slave))
2655 bond_arp_send_all(bond, slave);
2656 }
2657
2658 rcu_read_unlock();
2659
2660 if (do_failover || slave_state_changed) {
2661 if (!rtnl_trylock())
2662 goto re_arm;
2663
2664 if (slave_state_changed) {
2665 bond_slave_state_change(bond);
2666 if (BOND_MODE(bond) == BOND_MODE_XOR)
2667 bond_update_slave_arr(bond, NULL);
2668 }
2669 if (do_failover) {
2670 block_netpoll_tx();
2671 bond_select_active_slave(bond);
2672 unblock_netpoll_tx();
2673 }
2674 rtnl_unlock();
2675 }
2676
2677 re_arm:
2678 if (bond->params.arp_interval)
2679 queue_delayed_work(bond->wq, &bond->arp_work,
2680 msecs_to_jiffies(bond->params.arp_interval));
2681 }
2682
2683 /* Called to inspect slaves for active-backup mode ARP monitor link state
2684 * changes. Sets new_link in slaves to specify what action should take
2685 * place for the slave. Returns 0 if no changes are found, >0 if changes
2686 * to link states must be committed.
2687 *
2688 * Called with rcu_read_lock held.
2689 */
2690 static int bond_ab_arp_inspect(struct bonding *bond)
2691 {
2692 unsigned long trans_start, last_rx;
2693 struct list_head *iter;
2694 struct slave *slave;
2695 int commit = 0;
2696
2697 bond_for_each_slave_rcu(bond, slave, iter) {
2698 slave->new_link = BOND_LINK_NOCHANGE;
2699 last_rx = slave_last_rx(bond, slave);
2700
2701 if (slave->link != BOND_LINK_UP) {
2702 if (bond_time_in_interval(bond, last_rx, 1)) {
2703 slave->new_link = BOND_LINK_UP;
2704 commit++;
2705 }
2706 continue;
2707 }
2708
2709 /* Give slaves 2*delta after being enslaved or made
2710 * active. This avoids bouncing, as the last receive
2711 * times need a full ARP monitor cycle to be updated.
2712 */
2713 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2714 continue;
2715
2716 /* Backup slave is down if:
2717 * - No current_arp_slave AND
2718 * - more than 3*delta since last receive AND
2719 * - the bond has an IP address
2720 *
2721 * Note: a non-null current_arp_slave indicates
2722 * the curr_active_slave went down and we are
2723 * searching for a new one; under this condition
2724 * we only take the curr_active_slave down - this
2725 * gives each slave a chance to tx/rx traffic
2726 * before being taken out
2727 */
2728 if (!bond_is_active_slave(slave) &&
2729 !rcu_access_pointer(bond->current_arp_slave) &&
2730 !bond_time_in_interval(bond, last_rx, 3)) {
2731 slave->new_link = BOND_LINK_DOWN;
2732 commit++;
2733 }
2734
2735 /* Active slave is down if:
2736 * - more than 2*delta since transmitting OR
2737 * - (more than 2*delta since receive AND
2738 * the bond has an IP address)
2739 */
2740 trans_start = dev_trans_start(slave->dev);
2741 if (bond_is_active_slave(slave) &&
2742 (!bond_time_in_interval(bond, trans_start, 2) ||
2743 !bond_time_in_interval(bond, last_rx, 2))) {
2744 slave->new_link = BOND_LINK_DOWN;
2745 commit++;
2746 }
2747 }
2748
2749 return commit;
2750 }
2751
2752 /* Called to commit link state changes noted by inspection step of
2753 * active-backup mode ARP monitor.
2754 *
2755 * Called with RTNL hold.
2756 */
2757 static void bond_ab_arp_commit(struct bonding *bond)
2758 {
2759 unsigned long trans_start;
2760 struct list_head *iter;
2761 struct slave *slave;
2762
2763 bond_for_each_slave(bond, slave, iter) {
2764 switch (slave->new_link) {
2765 case BOND_LINK_NOCHANGE:
2766 continue;
2767
2768 case BOND_LINK_UP:
2769 trans_start = dev_trans_start(slave->dev);
2770 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2771 (!rtnl_dereference(bond->curr_active_slave) &&
2772 bond_time_in_interval(bond, trans_start, 1))) {
2773 struct slave *current_arp_slave;
2774
2775 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2776 bond_set_slave_link_state(slave, BOND_LINK_UP,
2777 BOND_SLAVE_NOTIFY_NOW);
2778 if (current_arp_slave) {
2779 bond_set_slave_inactive_flags(
2780 current_arp_slave,
2781 BOND_SLAVE_NOTIFY_NOW);
2782 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2783 }
2784
2785 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2786 slave->dev->name);
2787
2788 if (!rtnl_dereference(bond->curr_active_slave) ||
2789 slave == rtnl_dereference(bond->primary_slave))
2790 goto do_failover;
2791
2792 }
2793
2794 continue;
2795
2796 case BOND_LINK_DOWN:
2797 if (slave->link_failure_count < UINT_MAX)
2798 slave->link_failure_count++;
2799
2800 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2801 BOND_SLAVE_NOTIFY_NOW);
2802 bond_set_slave_inactive_flags(slave,
2803 BOND_SLAVE_NOTIFY_NOW);
2804
2805 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2806 slave->dev->name);
2807
2808 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2809 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2810 goto do_failover;
2811 }
2812
2813 continue;
2814
2815 default:
2816 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2817 slave->new_link, slave->dev->name);
2818 continue;
2819 }
2820
2821 do_failover:
2822 block_netpoll_tx();
2823 bond_select_active_slave(bond);
2824 unblock_netpoll_tx();
2825 }
2826
2827 bond_set_carrier(bond);
2828 }
2829
2830 /* Send ARP probes for active-backup mode ARP monitor.
2831 *
2832 * Called with rcu_read_lock held.
2833 */
2834 static bool bond_ab_arp_probe(struct bonding *bond)
2835 {
2836 struct slave *slave, *before = NULL, *new_slave = NULL,
2837 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2838 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2839 struct list_head *iter;
2840 bool found = false;
2841 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2842
2843 if (curr_arp_slave && curr_active_slave)
2844 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2845 curr_arp_slave->dev->name,
2846 curr_active_slave->dev->name);
2847
2848 if (curr_active_slave) {
2849 bond_arp_send_all(bond, curr_active_slave);
2850 return should_notify_rtnl;
2851 }
2852
2853 /* if we don't have a curr_active_slave, search for the next available
2854 * backup slave from the current_arp_slave and make it the candidate
2855 * for becoming the curr_active_slave
2856 */
2857
2858 if (!curr_arp_slave) {
2859 curr_arp_slave = bond_first_slave_rcu(bond);
2860 if (!curr_arp_slave)
2861 return should_notify_rtnl;
2862 }
2863
2864 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2865
2866 bond_for_each_slave_rcu(bond, slave, iter) {
2867 if (!found && !before && bond_slave_is_up(slave))
2868 before = slave;
2869
2870 if (found && !new_slave && bond_slave_is_up(slave))
2871 new_slave = slave;
2872 /* if the link state is up at this point, we
2873 * mark it down - this can happen if we have
2874 * simultaneous link failures and
2875 * reselect_active_interface doesn't make this
2876 * one the current slave so it is still marked
2877 * up when it is actually down
2878 */
2879 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2880 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2881 BOND_SLAVE_NOTIFY_LATER);
2882 if (slave->link_failure_count < UINT_MAX)
2883 slave->link_failure_count++;
2884
2885 bond_set_slave_inactive_flags(slave,
2886 BOND_SLAVE_NOTIFY_LATER);
2887
2888 netdev_info(bond->dev, "backup interface %s is now down\n",
2889 slave->dev->name);
2890 }
2891 if (slave == curr_arp_slave)
2892 found = true;
2893 }
2894
2895 if (!new_slave && before)
2896 new_slave = before;
2897
2898 if (!new_slave)
2899 goto check_state;
2900
2901 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2902 BOND_SLAVE_NOTIFY_LATER);
2903 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2904 bond_arp_send_all(bond, new_slave);
2905 new_slave->last_link_up = jiffies;
2906 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2907
2908 check_state:
2909 bond_for_each_slave_rcu(bond, slave, iter) {
2910 if (slave->should_notify || slave->should_notify_link) {
2911 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2912 break;
2913 }
2914 }
2915 return should_notify_rtnl;
2916 }
2917
2918 static void bond_activebackup_arp_mon(struct work_struct *work)
2919 {
2920 struct bonding *bond = container_of(work, struct bonding,
2921 arp_work.work);
2922 bool should_notify_peers = false;
2923 bool should_notify_rtnl = false;
2924 int delta_in_ticks;
2925
2926 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2927
2928 if (!bond_has_slaves(bond))
2929 goto re_arm;
2930
2931 rcu_read_lock();
2932
2933 should_notify_peers = bond_should_notify_peers(bond);
2934
2935 if (bond_ab_arp_inspect(bond)) {
2936 rcu_read_unlock();
2937
2938 /* Race avoidance with bond_close flush of workqueue */
2939 if (!rtnl_trylock()) {
2940 delta_in_ticks = 1;
2941 should_notify_peers = false;
2942 goto re_arm;
2943 }
2944
2945 bond_ab_arp_commit(bond);
2946
2947 rtnl_unlock();
2948 rcu_read_lock();
2949 }
2950
2951 should_notify_rtnl = bond_ab_arp_probe(bond);
2952 rcu_read_unlock();
2953
2954 re_arm:
2955 if (bond->params.arp_interval)
2956 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2957
2958 if (should_notify_peers || should_notify_rtnl) {
2959 if (!rtnl_trylock())
2960 return;
2961
2962 if (should_notify_peers)
2963 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2964 bond->dev);
2965 if (should_notify_rtnl) {
2966 bond_slave_state_notify(bond);
2967 bond_slave_link_notify(bond);
2968 }
2969
2970 rtnl_unlock();
2971 }
2972 }
2973
2974 /*-------------------------- netdev event handling --------------------------*/
2975
2976 /* Change device name */
2977 static int bond_event_changename(struct bonding *bond)
2978 {
2979 bond_remove_proc_entry(bond);
2980 bond_create_proc_entry(bond);
2981
2982 bond_debug_reregister(bond);
2983
2984 return NOTIFY_DONE;
2985 }
2986
2987 static int bond_master_netdev_event(unsigned long event,
2988 struct net_device *bond_dev)
2989 {
2990 struct bonding *event_bond = netdev_priv(bond_dev);
2991
2992 switch (event) {
2993 case NETDEV_CHANGENAME:
2994 return bond_event_changename(event_bond);
2995 case NETDEV_UNREGISTER:
2996 bond_remove_proc_entry(event_bond);
2997 break;
2998 case NETDEV_REGISTER:
2999 bond_create_proc_entry(event_bond);
3000 break;
3001 case NETDEV_NOTIFY_PEERS:
3002 if (event_bond->send_peer_notif)
3003 event_bond->send_peer_notif--;
3004 break;
3005 default:
3006 break;
3007 }
3008
3009 return NOTIFY_DONE;
3010 }
3011
3012 static int bond_slave_netdev_event(unsigned long event,
3013 struct net_device *slave_dev)
3014 {
3015 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3016 struct bonding *bond;
3017 struct net_device *bond_dev;
3018
3019 /* A netdev event can be generated while enslaving a device
3020 * before netdev_rx_handler_register is called in which case
3021 * slave will be NULL
3022 */
3023 if (!slave)
3024 return NOTIFY_DONE;
3025 bond_dev = slave->bond->dev;
3026 bond = slave->bond;
3027 primary = rtnl_dereference(bond->primary_slave);
3028
3029 switch (event) {
3030 case NETDEV_UNREGISTER:
3031 if (bond_dev->type != ARPHRD_ETHER)
3032 bond_release_and_destroy(bond_dev, slave_dev);
3033 else
3034 bond_release(bond_dev, slave_dev);
3035 break;
3036 case NETDEV_UP:
3037 case NETDEV_CHANGE:
3038 bond_update_speed_duplex(slave);
3039 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3040 bond_3ad_adapter_speed_duplex_changed(slave);
3041 /* Fallthrough */
3042 case NETDEV_DOWN:
3043 /* Refresh slave-array if applicable!
3044 * If the setup does not use miimon or arpmon (mode-specific!),
3045 * then these events will not cause the slave-array to be
3046 * refreshed. This will cause xmit to use a slave that is not
3047 * usable. Avoid such situation by refeshing the array at these
3048 * events. If these (miimon/arpmon) parameters are configured
3049 * then array gets refreshed twice and that should be fine!
3050 */
3051 if (bond_mode_uses_xmit_hash(bond))
3052 bond_update_slave_arr(bond, NULL);
3053 break;
3054 case NETDEV_CHANGEMTU:
3055 /* TODO: Should slaves be allowed to
3056 * independently alter their MTU? For
3057 * an active-backup bond, slaves need
3058 * not be the same type of device, so
3059 * MTUs may vary. For other modes,
3060 * slaves arguably should have the
3061 * same MTUs. To do this, we'd need to
3062 * take over the slave's change_mtu
3063 * function for the duration of their
3064 * servitude.
3065 */
3066 break;
3067 case NETDEV_CHANGENAME:
3068 /* we don't care if we don't have primary set */
3069 if (!bond_uses_primary(bond) ||
3070 !bond->params.primary[0])
3071 break;
3072
3073 if (slave == primary) {
3074 /* slave's name changed - he's no longer primary */
3075 RCU_INIT_POINTER(bond->primary_slave, NULL);
3076 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3077 /* we have a new primary slave */
3078 rcu_assign_pointer(bond->primary_slave, slave);
3079 } else { /* we didn't change primary - exit */
3080 break;
3081 }
3082
3083 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3084 primary ? slave_dev->name : "none");
3085
3086 block_netpoll_tx();
3087 bond_select_active_slave(bond);
3088 unblock_netpoll_tx();
3089 break;
3090 case NETDEV_FEAT_CHANGE:
3091 bond_compute_features(bond);
3092 break;
3093 case NETDEV_RESEND_IGMP:
3094 /* Propagate to master device */
3095 call_netdevice_notifiers(event, slave->bond->dev);
3096 break;
3097 default:
3098 break;
3099 }
3100
3101 return NOTIFY_DONE;
3102 }
3103
3104 /* bond_netdev_event: handle netdev notifier chain events.
3105 *
3106 * This function receives events for the netdev chain. The caller (an
3107 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3108 * locks for us to safely manipulate the slave devices (RTNL lock,
3109 * dev_probe_lock).
3110 */
3111 static int bond_netdev_event(struct notifier_block *this,
3112 unsigned long event, void *ptr)
3113 {
3114 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3115
3116 netdev_dbg(event_dev, "event: %lx\n", event);
3117
3118 if (!(event_dev->priv_flags & IFF_BONDING))
3119 return NOTIFY_DONE;
3120
3121 if (event_dev->flags & IFF_MASTER) {
3122 netdev_dbg(event_dev, "IFF_MASTER\n");
3123 return bond_master_netdev_event(event, event_dev);
3124 }
3125
3126 if (event_dev->flags & IFF_SLAVE) {
3127 netdev_dbg(event_dev, "IFF_SLAVE\n");
3128 return bond_slave_netdev_event(event, event_dev);
3129 }
3130
3131 return NOTIFY_DONE;
3132 }
3133
3134 static struct notifier_block bond_netdev_notifier = {
3135 .notifier_call = bond_netdev_event,
3136 };
3137
3138 /*---------------------------- Hashing Policies -----------------------------*/
3139
3140 /* L2 hash helper */
3141 static inline u32 bond_eth_hash(struct sk_buff *skb)
3142 {
3143 struct ethhdr *ep, hdr_tmp;
3144
3145 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3146 if (ep)
3147 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3148 return 0;
3149 }
3150
3151 /* Extract the appropriate headers based on bond's xmit policy */
3152 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3153 struct flow_keys *fk)
3154 {
3155 const struct ipv6hdr *iph6;
3156 const struct iphdr *iph;
3157 int noff, proto = -1;
3158
3159 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3160 return skb_flow_dissect_flow_keys(skb, fk, 0);
3161
3162 fk->ports.ports = 0;
3163 noff = skb_network_offset(skb);
3164 if (skb->protocol == htons(ETH_P_IP)) {
3165 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3166 return false;
3167 iph = ip_hdr(skb);
3168 iph_to_flow_copy_v4addrs(fk, iph);
3169 noff += iph->ihl << 2;
3170 if (!ip_is_fragment(iph))
3171 proto = iph->protocol;
3172 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3173 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3174 return false;
3175 iph6 = ipv6_hdr(skb);
3176 iph_to_flow_copy_v6addrs(fk, iph6);
3177 noff += sizeof(*iph6);
3178 proto = iph6->nexthdr;
3179 } else {
3180 return false;
3181 }
3182 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3183 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3184
3185 return true;
3186 }
3187
3188 /**
3189 * bond_xmit_hash - generate a hash value based on the xmit policy
3190 * @bond: bonding device
3191 * @skb: buffer to use for headers
3192 *
3193 * This function will extract the necessary headers from the skb buffer and use
3194 * them to generate a hash based on the xmit_policy set in the bonding device
3195 */
3196 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3197 {
3198 struct flow_keys flow;
3199 u32 hash;
3200
3201 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3202 skb->l4_hash)
3203 return skb->hash;
3204
3205 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3206 !bond_flow_dissect(bond, skb, &flow))
3207 return bond_eth_hash(skb);
3208
3209 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3210 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3211 hash = bond_eth_hash(skb);
3212 else
3213 hash = (__force u32)flow.ports.ports;
3214 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3215 (__force u32)flow_get_u32_src(&flow);
3216 hash ^= (hash >> 16);
3217 hash ^= (hash >> 8);
3218
3219 return hash;
3220 }
3221
3222 /*-------------------------- Device entry points ----------------------------*/
3223
3224 static void bond_work_init_all(struct bonding *bond)
3225 {
3226 INIT_DELAYED_WORK(&bond->mcast_work,
3227 bond_resend_igmp_join_requests_delayed);
3228 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3229 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3230 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3231 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3232 else
3233 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3234 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3235 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3236 }
3237
3238 static void bond_work_cancel_all(struct bonding *bond)
3239 {
3240 cancel_delayed_work_sync(&bond->mii_work);
3241 cancel_delayed_work_sync(&bond->arp_work);
3242 cancel_delayed_work_sync(&bond->alb_work);
3243 cancel_delayed_work_sync(&bond->ad_work);
3244 cancel_delayed_work_sync(&bond->mcast_work);
3245 cancel_delayed_work_sync(&bond->slave_arr_work);
3246 }
3247
3248 static int bond_open(struct net_device *bond_dev)
3249 {
3250 struct bonding *bond = netdev_priv(bond_dev);
3251 struct list_head *iter;
3252 struct slave *slave;
3253
3254 /* reset slave->backup and slave->inactive */
3255 if (bond_has_slaves(bond)) {
3256 bond_for_each_slave(bond, slave, iter) {
3257 if (bond_uses_primary(bond) &&
3258 slave != rcu_access_pointer(bond->curr_active_slave)) {
3259 bond_set_slave_inactive_flags(slave,
3260 BOND_SLAVE_NOTIFY_NOW);
3261 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3262 bond_set_slave_active_flags(slave,
3263 BOND_SLAVE_NOTIFY_NOW);
3264 }
3265 }
3266 }
3267
3268 bond_work_init_all(bond);
3269
3270 if (bond_is_lb(bond)) {
3271 /* bond_alb_initialize must be called before the timer
3272 * is started.
3273 */
3274 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3275 return -ENOMEM;
3276 if (bond->params.tlb_dynamic_lb)
3277 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3278 }
3279
3280 if (bond->params.miimon) /* link check interval, in milliseconds. */
3281 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3282
3283 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3284 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3285 bond->recv_probe = bond_arp_rcv;
3286 }
3287
3288 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3289 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3290 /* register to receive LACPDUs */
3291 bond->recv_probe = bond_3ad_lacpdu_recv;
3292 bond_3ad_initiate_agg_selection(bond, 1);
3293 }
3294
3295 if (bond_mode_uses_xmit_hash(bond))
3296 bond_update_slave_arr(bond, NULL);
3297
3298 return 0;
3299 }
3300
3301 static int bond_close(struct net_device *bond_dev)
3302 {
3303 struct bonding *bond = netdev_priv(bond_dev);
3304
3305 bond_work_cancel_all(bond);
3306 bond->send_peer_notif = 0;
3307 if (bond_is_lb(bond))
3308 bond_alb_deinitialize(bond);
3309 bond->recv_probe = NULL;
3310
3311 return 0;
3312 }
3313
3314 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3315 * that some drivers can provide 32bit values only.
3316 */
3317 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3318 const struct rtnl_link_stats64 *_new,
3319 const struct rtnl_link_stats64 *_old)
3320 {
3321 const u64 *new = (const u64 *)_new;
3322 const u64 *old = (const u64 *)_old;
3323 u64 *res = (u64 *)_res;
3324 int i;
3325
3326 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3327 u64 nv = new[i];
3328 u64 ov = old[i];
3329
3330 /* detects if this particular field is 32bit only */
3331 if (((nv | ov) >> 32) == 0)
3332 res[i] += (u32)nv - (u32)ov;
3333 else
3334 res[i] += nv - ov;
3335 }
3336 }
3337
3338 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3339 struct rtnl_link_stats64 *stats)
3340 {
3341 struct bonding *bond = netdev_priv(bond_dev);
3342 struct rtnl_link_stats64 temp;
3343 struct list_head *iter;
3344 struct slave *slave;
3345
3346 spin_lock(&bond->stats_lock);
3347 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3348
3349 rcu_read_lock();
3350 bond_for_each_slave_rcu(bond, slave, iter) {
3351 const struct rtnl_link_stats64 *new =
3352 dev_get_stats(slave->dev, &temp);
3353
3354 bond_fold_stats(stats, new, &slave->slave_stats);
3355
3356 /* save off the slave stats for the next run */
3357 memcpy(&slave->slave_stats, new, sizeof(*new));
3358 }
3359 rcu_read_unlock();
3360
3361 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3362 spin_unlock(&bond->stats_lock);
3363
3364 return stats;
3365 }
3366
3367 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3368 {
3369 struct bonding *bond = netdev_priv(bond_dev);
3370 struct net_device *slave_dev = NULL;
3371 struct ifbond k_binfo;
3372 struct ifbond __user *u_binfo = NULL;
3373 struct ifslave k_sinfo;
3374 struct ifslave __user *u_sinfo = NULL;
3375 struct mii_ioctl_data *mii = NULL;
3376 struct bond_opt_value newval;
3377 struct net *net;
3378 int res = 0;
3379
3380 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3381
3382 switch (cmd) {
3383 case SIOCGMIIPHY:
3384 mii = if_mii(ifr);
3385 if (!mii)
3386 return -EINVAL;
3387
3388 mii->phy_id = 0;
3389 /* Fall Through */
3390 case SIOCGMIIREG:
3391 /* We do this again just in case we were called by SIOCGMIIREG
3392 * instead of SIOCGMIIPHY.
3393 */
3394 mii = if_mii(ifr);
3395 if (!mii)
3396 return -EINVAL;
3397
3398 if (mii->reg_num == 1) {
3399 mii->val_out = 0;
3400 if (netif_carrier_ok(bond->dev))
3401 mii->val_out = BMSR_LSTATUS;
3402 }
3403
3404 return 0;
3405 case BOND_INFO_QUERY_OLD:
3406 case SIOCBONDINFOQUERY:
3407 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3408
3409 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3410 return -EFAULT;
3411
3412 res = bond_info_query(bond_dev, &k_binfo);
3413 if (res == 0 &&
3414 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3415 return -EFAULT;
3416
3417 return res;
3418 case BOND_SLAVE_INFO_QUERY_OLD:
3419 case SIOCBONDSLAVEINFOQUERY:
3420 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3421
3422 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3423 return -EFAULT;
3424
3425 res = bond_slave_info_query(bond_dev, &k_sinfo);
3426 if (res == 0 &&
3427 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3428 return -EFAULT;
3429
3430 return res;
3431 default:
3432 break;
3433 }
3434
3435 net = dev_net(bond_dev);
3436
3437 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3438 return -EPERM;
3439
3440 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3441
3442 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3443
3444 if (!slave_dev)
3445 return -ENODEV;
3446
3447 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3448 switch (cmd) {
3449 case BOND_ENSLAVE_OLD:
3450 case SIOCBONDENSLAVE:
3451 res = bond_enslave(bond_dev, slave_dev);
3452 break;
3453 case BOND_RELEASE_OLD:
3454 case SIOCBONDRELEASE:
3455 res = bond_release(bond_dev, slave_dev);
3456 break;
3457 case BOND_SETHWADDR_OLD:
3458 case SIOCBONDSETHWADDR:
3459 bond_set_dev_addr(bond_dev, slave_dev);
3460 res = 0;
3461 break;
3462 case BOND_CHANGE_ACTIVE_OLD:
3463 case SIOCBONDCHANGEACTIVE:
3464 bond_opt_initstr(&newval, slave_dev->name);
3465 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3466 break;
3467 default:
3468 res = -EOPNOTSUPP;
3469 }
3470
3471 return res;
3472 }
3473
3474 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3475 {
3476 struct bonding *bond = netdev_priv(bond_dev);
3477
3478 if (change & IFF_PROMISC)
3479 bond_set_promiscuity(bond,
3480 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3481
3482 if (change & IFF_ALLMULTI)
3483 bond_set_allmulti(bond,
3484 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3485 }
3486
3487 static void bond_set_rx_mode(struct net_device *bond_dev)
3488 {
3489 struct bonding *bond = netdev_priv(bond_dev);
3490 struct list_head *iter;
3491 struct slave *slave;
3492
3493 rcu_read_lock();
3494 if (bond_uses_primary(bond)) {
3495 slave = rcu_dereference(bond->curr_active_slave);
3496 if (slave) {
3497 dev_uc_sync(slave->dev, bond_dev);
3498 dev_mc_sync(slave->dev, bond_dev);
3499 }
3500 } else {
3501 bond_for_each_slave_rcu(bond, slave, iter) {
3502 dev_uc_sync_multiple(slave->dev, bond_dev);
3503 dev_mc_sync_multiple(slave->dev, bond_dev);
3504 }
3505 }
3506 rcu_read_unlock();
3507 }
3508
3509 static int bond_neigh_init(struct neighbour *n)
3510 {
3511 struct bonding *bond = netdev_priv(n->dev);
3512 const struct net_device_ops *slave_ops;
3513 struct neigh_parms parms;
3514 struct slave *slave;
3515 int ret;
3516
3517 slave = bond_first_slave(bond);
3518 if (!slave)
3519 return 0;
3520 slave_ops = slave->dev->netdev_ops;
3521 if (!slave_ops->ndo_neigh_setup)
3522 return 0;
3523
3524 parms.neigh_setup = NULL;
3525 parms.neigh_cleanup = NULL;
3526 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3527 if (ret)
3528 return ret;
3529
3530 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3531 * after the last slave has been detached. Assumes that all slaves
3532 * utilize the same neigh_cleanup (true at this writing as only user
3533 * is ipoib).
3534 */
3535 n->parms->neigh_cleanup = parms.neigh_cleanup;
3536
3537 if (!parms.neigh_setup)
3538 return 0;
3539
3540 return parms.neigh_setup(n);
3541 }
3542
3543 /* The bonding ndo_neigh_setup is called at init time beofre any
3544 * slave exists. So we must declare proxy setup function which will
3545 * be used at run time to resolve the actual slave neigh param setup.
3546 *
3547 * It's also called by master devices (such as vlans) to setup their
3548 * underlying devices. In that case - do nothing, we're already set up from
3549 * our init.
3550 */
3551 static int bond_neigh_setup(struct net_device *dev,
3552 struct neigh_parms *parms)
3553 {
3554 /* modify only our neigh_parms */
3555 if (parms->dev == dev)
3556 parms->neigh_setup = bond_neigh_init;
3557
3558 return 0;
3559 }
3560
3561 /* Change the MTU of all of a master's slaves to match the master */
3562 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3563 {
3564 struct bonding *bond = netdev_priv(bond_dev);
3565 struct slave *slave, *rollback_slave;
3566 struct list_head *iter;
3567 int res = 0;
3568
3569 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3570
3571 bond_for_each_slave(bond, slave, iter) {
3572 netdev_dbg(bond_dev, "s %p c_m %p\n",
3573 slave, slave->dev->netdev_ops->ndo_change_mtu);
3574
3575 res = dev_set_mtu(slave->dev, new_mtu);
3576
3577 if (res) {
3578 /* If we failed to set the slave's mtu to the new value
3579 * we must abort the operation even in ACTIVE_BACKUP
3580 * mode, because if we allow the backup slaves to have
3581 * different mtu values than the active slave we'll
3582 * need to change their mtu when doing a failover. That
3583 * means changing their mtu from timer context, which
3584 * is probably not a good idea.
3585 */
3586 netdev_dbg(bond_dev, "err %d %s\n", res,
3587 slave->dev->name);
3588 goto unwind;
3589 }
3590 }
3591
3592 bond_dev->mtu = new_mtu;
3593
3594 return 0;
3595
3596 unwind:
3597 /* unwind from head to the slave that failed */
3598 bond_for_each_slave(bond, rollback_slave, iter) {
3599 int tmp_res;
3600
3601 if (rollback_slave == slave)
3602 break;
3603
3604 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3605 if (tmp_res) {
3606 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3607 tmp_res, rollback_slave->dev->name);
3608 }
3609 }
3610
3611 return res;
3612 }
3613
3614 /* Change HW address
3615 *
3616 * Note that many devices must be down to change the HW address, and
3617 * downing the master releases all slaves. We can make bonds full of
3618 * bonding devices to test this, however.
3619 */
3620 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3621 {
3622 struct bonding *bond = netdev_priv(bond_dev);
3623 struct slave *slave, *rollback_slave;
3624 struct sockaddr *sa = addr, tmp_sa;
3625 struct list_head *iter;
3626 int res = 0;
3627
3628 if (BOND_MODE(bond) == BOND_MODE_ALB)
3629 return bond_alb_set_mac_address(bond_dev, addr);
3630
3631
3632 netdev_dbg(bond_dev, "bond=%p\n", bond);
3633
3634 /* If fail_over_mac is enabled, do nothing and return success.
3635 * Returning an error causes ifenslave to fail.
3636 */
3637 if (bond->params.fail_over_mac &&
3638 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3639 return 0;
3640
3641 if (!is_valid_ether_addr(sa->sa_data))
3642 return -EADDRNOTAVAIL;
3643
3644 bond_for_each_slave(bond, slave, iter) {
3645 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3646 res = dev_set_mac_address(slave->dev, addr);
3647 if (res) {
3648 /* TODO: consider downing the slave
3649 * and retry ?
3650 * User should expect communications
3651 * breakage anyway until ARP finish
3652 * updating, so...
3653 */
3654 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3655 goto unwind;
3656 }
3657 }
3658
3659 /* success */
3660 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3661 return 0;
3662
3663 unwind:
3664 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3665 tmp_sa.sa_family = bond_dev->type;
3666
3667 /* unwind from head to the slave that failed */
3668 bond_for_each_slave(bond, rollback_slave, iter) {
3669 int tmp_res;
3670
3671 if (rollback_slave == slave)
3672 break;
3673
3674 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3675 if (tmp_res) {
3676 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3677 tmp_res, rollback_slave->dev->name);
3678 }
3679 }
3680
3681 return res;
3682 }
3683
3684 /**
3685 * bond_xmit_slave_id - transmit skb through slave with slave_id
3686 * @bond: bonding device that is transmitting
3687 * @skb: buffer to transmit
3688 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3689 *
3690 * This function tries to transmit through slave with slave_id but in case
3691 * it fails, it tries to find the first available slave for transmission.
3692 * The skb is consumed in all cases, thus the function is void.
3693 */
3694 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3695 {
3696 struct list_head *iter;
3697 struct slave *slave;
3698 int i = slave_id;
3699
3700 /* Here we start from the slave with slave_id */
3701 bond_for_each_slave_rcu(bond, slave, iter) {
3702 if (--i < 0) {
3703 if (bond_slave_can_tx(slave)) {
3704 bond_dev_queue_xmit(bond, skb, slave->dev);
3705 return;
3706 }
3707 }
3708 }
3709
3710 /* Here we start from the first slave up to slave_id */
3711 i = slave_id;
3712 bond_for_each_slave_rcu(bond, slave, iter) {
3713 if (--i < 0)
3714 break;
3715 if (bond_slave_can_tx(slave)) {
3716 bond_dev_queue_xmit(bond, skb, slave->dev);
3717 return;
3718 }
3719 }
3720 /* no slave that can tx has been found */
3721 bond_tx_drop(bond->dev, skb);
3722 }
3723
3724 /**
3725 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3726 * @bond: bonding device to use
3727 *
3728 * Based on the value of the bonding device's packets_per_slave parameter
3729 * this function generates a slave id, which is usually used as the next
3730 * slave to transmit through.
3731 */
3732 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3733 {
3734 u32 slave_id;
3735 struct reciprocal_value reciprocal_packets_per_slave;
3736 int packets_per_slave = bond->params.packets_per_slave;
3737
3738 switch (packets_per_slave) {
3739 case 0:
3740 slave_id = prandom_u32();
3741 break;
3742 case 1:
3743 slave_id = bond->rr_tx_counter;
3744 break;
3745 default:
3746 reciprocal_packets_per_slave =
3747 bond->params.reciprocal_packets_per_slave;
3748 slave_id = reciprocal_divide(bond->rr_tx_counter,
3749 reciprocal_packets_per_slave);
3750 break;
3751 }
3752 bond->rr_tx_counter++;
3753
3754 return slave_id;
3755 }
3756
3757 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3758 {
3759 struct bonding *bond = netdev_priv(bond_dev);
3760 struct iphdr *iph = ip_hdr(skb);
3761 struct slave *slave;
3762 u32 slave_id;
3763
3764 /* Start with the curr_active_slave that joined the bond as the
3765 * default for sending IGMP traffic. For failover purposes one
3766 * needs to maintain some consistency for the interface that will
3767 * send the join/membership reports. The curr_active_slave found
3768 * will send all of this type of traffic.
3769 */
3770 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3771 slave = rcu_dereference(bond->curr_active_slave);
3772 if (slave)
3773 bond_dev_queue_xmit(bond, skb, slave->dev);
3774 else
3775 bond_xmit_slave_id(bond, skb, 0);
3776 } else {
3777 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3778
3779 if (likely(slave_cnt)) {
3780 slave_id = bond_rr_gen_slave_id(bond);
3781 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3782 } else {
3783 bond_tx_drop(bond_dev, skb);
3784 }
3785 }
3786
3787 return NETDEV_TX_OK;
3788 }
3789
3790 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3791 * the bond has a usable interface.
3792 */
3793 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3794 {
3795 struct bonding *bond = netdev_priv(bond_dev);
3796 struct slave *slave;
3797
3798 slave = rcu_dereference(bond->curr_active_slave);
3799 if (slave)
3800 bond_dev_queue_xmit(bond, skb, slave->dev);
3801 else
3802 bond_tx_drop(bond_dev, skb);
3803
3804 return NETDEV_TX_OK;
3805 }
3806
3807 /* Use this to update slave_array when (a) it's not appropriate to update
3808 * slave_array right away (note that update_slave_array() may sleep)
3809 * and / or (b) RTNL is not held.
3810 */
3811 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3812 {
3813 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3814 }
3815
3816 /* Slave array work handler. Holds only RTNL */
3817 static void bond_slave_arr_handler(struct work_struct *work)
3818 {
3819 struct bonding *bond = container_of(work, struct bonding,
3820 slave_arr_work.work);
3821 int ret;
3822
3823 if (!rtnl_trylock())
3824 goto err;
3825
3826 ret = bond_update_slave_arr(bond, NULL);
3827 rtnl_unlock();
3828 if (ret) {
3829 pr_warn_ratelimited("Failed to update slave array from WT\n");
3830 goto err;
3831 }
3832 return;
3833
3834 err:
3835 bond_slave_arr_work_rearm(bond, 1);
3836 }
3837
3838 /* Build the usable slaves array in control path for modes that use xmit-hash
3839 * to determine the slave interface -
3840 * (a) BOND_MODE_8023AD
3841 * (b) BOND_MODE_XOR
3842 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3843 *
3844 * The caller is expected to hold RTNL only and NO other lock!
3845 */
3846 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3847 {
3848 struct slave *slave;
3849 struct list_head *iter;
3850 struct bond_up_slave *new_arr, *old_arr;
3851 int agg_id = 0;
3852 int ret = 0;
3853
3854 #ifdef CONFIG_LOCKDEP
3855 WARN_ON(lockdep_is_held(&bond->mode_lock));
3856 #endif
3857
3858 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3859 GFP_KERNEL);
3860 if (!new_arr) {
3861 ret = -ENOMEM;
3862 pr_err("Failed to build slave-array.\n");
3863 goto out;
3864 }
3865 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3866 struct ad_info ad_info;
3867
3868 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3869 pr_debug("bond_3ad_get_active_agg_info failed\n");
3870 kfree_rcu(new_arr, rcu);
3871 /* No active aggragator means it's not safe to use
3872 * the previous array.
3873 */
3874 old_arr = rtnl_dereference(bond->slave_arr);
3875 if (old_arr) {
3876 RCU_INIT_POINTER(bond->slave_arr, NULL);
3877 kfree_rcu(old_arr, rcu);
3878 }
3879 goto out;
3880 }
3881 agg_id = ad_info.aggregator_id;
3882 }
3883 bond_for_each_slave(bond, slave, iter) {
3884 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3885 struct aggregator *agg;
3886
3887 agg = SLAVE_AD_INFO(slave)->port.aggregator;
3888 if (!agg || agg->aggregator_identifier != agg_id)
3889 continue;
3890 }
3891 if (!bond_slave_can_tx(slave))
3892 continue;
3893 if (skipslave == slave)
3894 continue;
3895 new_arr->arr[new_arr->count++] = slave;
3896 }
3897
3898 old_arr = rtnl_dereference(bond->slave_arr);
3899 rcu_assign_pointer(bond->slave_arr, new_arr);
3900 if (old_arr)
3901 kfree_rcu(old_arr, rcu);
3902 out:
3903 if (ret != 0 && skipslave) {
3904 int idx;
3905
3906 /* Rare situation where caller has asked to skip a specific
3907 * slave but allocation failed (most likely!). BTW this is
3908 * only possible when the call is initiated from
3909 * __bond_release_one(). In this situation; overwrite the
3910 * skipslave entry in the array with the last entry from the
3911 * array to avoid a situation where the xmit path may choose
3912 * this to-be-skipped slave to send a packet out.
3913 */
3914 old_arr = rtnl_dereference(bond->slave_arr);
3915 for (idx = 0; idx < old_arr->count; idx++) {
3916 if (skipslave == old_arr->arr[idx]) {
3917 old_arr->arr[idx] =
3918 old_arr->arr[old_arr->count-1];
3919 old_arr->count--;
3920 break;
3921 }
3922 }
3923 }
3924 return ret;
3925 }
3926
3927 /* Use this Xmit function for 3AD as well as XOR modes. The current
3928 * usable slave array is formed in the control path. The xmit function
3929 * just calculates hash and sends the packet out.
3930 */
3931 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3932 {
3933 struct bonding *bond = netdev_priv(dev);
3934 struct slave *slave;
3935 struct bond_up_slave *slaves;
3936 unsigned int count;
3937
3938 slaves = rcu_dereference(bond->slave_arr);
3939 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3940 if (likely(count)) {
3941 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3942 bond_dev_queue_xmit(bond, skb, slave->dev);
3943 } else {
3944 bond_tx_drop(dev, skb);
3945 }
3946
3947 return NETDEV_TX_OK;
3948 }
3949
3950 /* in broadcast mode, we send everything to all usable interfaces. */
3951 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3952 {
3953 struct bonding *bond = netdev_priv(bond_dev);
3954 struct slave *slave = NULL;
3955 struct list_head *iter;
3956
3957 bond_for_each_slave_rcu(bond, slave, iter) {
3958 if (bond_is_last_slave(bond, slave))
3959 break;
3960 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3961 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3962
3963 if (!skb2) {
3964 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3965 bond_dev->name, __func__);
3966 continue;
3967 }
3968 bond_dev_queue_xmit(bond, skb2, slave->dev);
3969 }
3970 }
3971 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3972 bond_dev_queue_xmit(bond, skb, slave->dev);
3973 else
3974 bond_tx_drop(bond_dev, skb);
3975
3976 return NETDEV_TX_OK;
3977 }
3978
3979 /*------------------------- Device initialization ---------------------------*/
3980
3981 /* Lookup the slave that corresponds to a qid */
3982 static inline int bond_slave_override(struct bonding *bond,
3983 struct sk_buff *skb)
3984 {
3985 struct slave *slave = NULL;
3986 struct list_head *iter;
3987
3988 if (!skb->queue_mapping)
3989 return 1;
3990
3991 /* Find out if any slaves have the same mapping as this skb. */
3992 bond_for_each_slave_rcu(bond, slave, iter) {
3993 if (slave->queue_id == skb->queue_mapping) {
3994 if (bond_slave_is_up(slave) &&
3995 slave->link == BOND_LINK_UP) {
3996 bond_dev_queue_xmit(bond, skb, slave->dev);
3997 return 0;
3998 }
3999 /* If the slave isn't UP, use default transmit policy. */
4000 break;
4001 }
4002 }
4003
4004 return 1;
4005 }
4006
4007
4008 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4009 void *accel_priv, select_queue_fallback_t fallback)
4010 {
4011 /* This helper function exists to help dev_pick_tx get the correct
4012 * destination queue. Using a helper function skips a call to
4013 * skb_tx_hash and will put the skbs in the queue we expect on their
4014 * way down to the bonding driver.
4015 */
4016 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4017
4018 /* Save the original txq to restore before passing to the driver */
4019 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4020
4021 if (unlikely(txq >= dev->real_num_tx_queues)) {
4022 do {
4023 txq -= dev->real_num_tx_queues;
4024 } while (txq >= dev->real_num_tx_queues);
4025 }
4026 return txq;
4027 }
4028
4029 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4030 {
4031 struct bonding *bond = netdev_priv(dev);
4032
4033 if (bond_should_override_tx_queue(bond) &&
4034 !bond_slave_override(bond, skb))
4035 return NETDEV_TX_OK;
4036
4037 switch (BOND_MODE(bond)) {
4038 case BOND_MODE_ROUNDROBIN:
4039 return bond_xmit_roundrobin(skb, dev);
4040 case BOND_MODE_ACTIVEBACKUP:
4041 return bond_xmit_activebackup(skb, dev);
4042 case BOND_MODE_8023AD:
4043 case BOND_MODE_XOR:
4044 return bond_3ad_xor_xmit(skb, dev);
4045 case BOND_MODE_BROADCAST:
4046 return bond_xmit_broadcast(skb, dev);
4047 case BOND_MODE_ALB:
4048 return bond_alb_xmit(skb, dev);
4049 case BOND_MODE_TLB:
4050 return bond_tlb_xmit(skb, dev);
4051 default:
4052 /* Should never happen, mode already checked */
4053 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4054 WARN_ON_ONCE(1);
4055 bond_tx_drop(dev, skb);
4056 return NETDEV_TX_OK;
4057 }
4058 }
4059
4060 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4061 {
4062 struct bonding *bond = netdev_priv(dev);
4063 netdev_tx_t ret = NETDEV_TX_OK;
4064
4065 /* If we risk deadlock from transmitting this in the
4066 * netpoll path, tell netpoll to queue the frame for later tx
4067 */
4068 if (unlikely(is_netpoll_tx_blocked(dev)))
4069 return NETDEV_TX_BUSY;
4070
4071 rcu_read_lock();
4072 if (bond_has_slaves(bond))
4073 ret = __bond_start_xmit(skb, dev);
4074 else
4075 bond_tx_drop(dev, skb);
4076 rcu_read_unlock();
4077
4078 return ret;
4079 }
4080
4081 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4082 struct ethtool_cmd *ecmd)
4083 {
4084 struct bonding *bond = netdev_priv(bond_dev);
4085 unsigned long speed = 0;
4086 struct list_head *iter;
4087 struct slave *slave;
4088
4089 ecmd->duplex = DUPLEX_UNKNOWN;
4090 ecmd->port = PORT_OTHER;
4091
4092 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4093 * do not need to check mode. Though link speed might not represent
4094 * the true receive or transmit bandwidth (not all modes are symmetric)
4095 * this is an accurate maximum.
4096 */
4097 bond_for_each_slave(bond, slave, iter) {
4098 if (bond_slave_can_tx(slave)) {
4099 if (slave->speed != SPEED_UNKNOWN)
4100 speed += slave->speed;
4101 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4102 slave->duplex != DUPLEX_UNKNOWN)
4103 ecmd->duplex = slave->duplex;
4104 }
4105 }
4106 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4107
4108 return 0;
4109 }
4110
4111 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4112 struct ethtool_drvinfo *drvinfo)
4113 {
4114 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4115 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4116 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4117 BOND_ABI_VERSION);
4118 }
4119
4120 static const struct ethtool_ops bond_ethtool_ops = {
4121 .get_drvinfo = bond_ethtool_get_drvinfo,
4122 .get_settings = bond_ethtool_get_settings,
4123 .get_link = ethtool_op_get_link,
4124 };
4125
4126 static const struct net_device_ops bond_netdev_ops = {
4127 .ndo_init = bond_init,
4128 .ndo_uninit = bond_uninit,
4129 .ndo_open = bond_open,
4130 .ndo_stop = bond_close,
4131 .ndo_start_xmit = bond_start_xmit,
4132 .ndo_select_queue = bond_select_queue,
4133 .ndo_get_stats64 = bond_get_stats,
4134 .ndo_do_ioctl = bond_do_ioctl,
4135 .ndo_change_rx_flags = bond_change_rx_flags,
4136 .ndo_set_rx_mode = bond_set_rx_mode,
4137 .ndo_change_mtu = bond_change_mtu,
4138 .ndo_set_mac_address = bond_set_mac_address,
4139 .ndo_neigh_setup = bond_neigh_setup,
4140 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4141 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4142 #ifdef CONFIG_NET_POLL_CONTROLLER
4143 .ndo_netpoll_setup = bond_netpoll_setup,
4144 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4145 .ndo_poll_controller = bond_poll_controller,
4146 #endif
4147 .ndo_add_slave = bond_enslave,
4148 .ndo_del_slave = bond_release,
4149 .ndo_fix_features = bond_fix_features,
4150 .ndo_neigh_construct = netdev_default_l2upper_neigh_construct,
4151 .ndo_neigh_destroy = netdev_default_l2upper_neigh_destroy,
4152 .ndo_bridge_setlink = switchdev_port_bridge_setlink,
4153 .ndo_bridge_getlink = switchdev_port_bridge_getlink,
4154 .ndo_bridge_dellink = switchdev_port_bridge_dellink,
4155 .ndo_fdb_add = switchdev_port_fdb_add,
4156 .ndo_fdb_del = switchdev_port_fdb_del,
4157 .ndo_fdb_dump = switchdev_port_fdb_dump,
4158 .ndo_features_check = passthru_features_check,
4159 };
4160
4161 static const struct device_type bond_type = {
4162 .name = "bond",
4163 };
4164
4165 static void bond_destructor(struct net_device *bond_dev)
4166 {
4167 struct bonding *bond = netdev_priv(bond_dev);
4168 if (bond->wq)
4169 destroy_workqueue(bond->wq);
4170 free_netdev(bond_dev);
4171 }
4172
4173 void bond_setup(struct net_device *bond_dev)
4174 {
4175 struct bonding *bond = netdev_priv(bond_dev);
4176
4177 spin_lock_init(&bond->mode_lock);
4178 spin_lock_init(&bond->stats_lock);
4179 bond->params = bonding_defaults;
4180
4181 /* Initialize pointers */
4182 bond->dev = bond_dev;
4183
4184 /* Initialize the device entry points */
4185 ether_setup(bond_dev);
4186 bond_dev->netdev_ops = &bond_netdev_ops;
4187 bond_dev->ethtool_ops = &bond_ethtool_ops;
4188
4189 bond_dev->destructor = bond_destructor;
4190
4191 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4192
4193 /* Initialize the device options */
4194 bond_dev->flags |= IFF_MASTER;
4195 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4196 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4197
4198 /* don't acquire bond device's netif_tx_lock when transmitting */
4199 bond_dev->features |= NETIF_F_LLTX;
4200
4201 /* By default, we declare the bond to be fully
4202 * VLAN hardware accelerated capable. Special
4203 * care is taken in the various xmit functions
4204 * when there are slaves that are not hw accel
4205 * capable
4206 */
4207
4208 /* Don't allow bond devices to change network namespaces. */
4209 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4210
4211 bond_dev->hw_features = BOND_VLAN_FEATURES |
4212 NETIF_F_HW_VLAN_CTAG_TX |
4213 NETIF_F_HW_VLAN_CTAG_RX |
4214 NETIF_F_HW_VLAN_CTAG_FILTER;
4215
4216 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4217 bond_dev->features |= bond_dev->hw_features;
4218 }
4219
4220 /* Destroy a bonding device.
4221 * Must be under rtnl_lock when this function is called.
4222 */
4223 static void bond_uninit(struct net_device *bond_dev)
4224 {
4225 struct bonding *bond = netdev_priv(bond_dev);
4226 struct list_head *iter;
4227 struct slave *slave;
4228 struct bond_up_slave *arr;
4229
4230 bond_netpoll_cleanup(bond_dev);
4231
4232 /* Release the bonded slaves */
4233 bond_for_each_slave(bond, slave, iter)
4234 __bond_release_one(bond_dev, slave->dev, true);
4235 netdev_info(bond_dev, "Released all slaves\n");
4236
4237 arr = rtnl_dereference(bond->slave_arr);
4238 if (arr) {
4239 RCU_INIT_POINTER(bond->slave_arr, NULL);
4240 kfree_rcu(arr, rcu);
4241 }
4242
4243 list_del(&bond->bond_list);
4244
4245 bond_debug_unregister(bond);
4246 }
4247
4248 /*------------------------- Module initialization ---------------------------*/
4249
4250 static int bond_check_params(struct bond_params *params)
4251 {
4252 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4253 struct bond_opt_value newval;
4254 const struct bond_opt_value *valptr;
4255 int arp_all_targets_value;
4256 u16 ad_actor_sys_prio = 0;
4257 u16 ad_user_port_key = 0;
4258
4259 /* Convert string parameters. */
4260 if (mode) {
4261 bond_opt_initstr(&newval, mode);
4262 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4263 if (!valptr) {
4264 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4265 return -EINVAL;
4266 }
4267 bond_mode = valptr->value;
4268 }
4269
4270 if (xmit_hash_policy) {
4271 if ((bond_mode != BOND_MODE_XOR) &&
4272 (bond_mode != BOND_MODE_8023AD) &&
4273 (bond_mode != BOND_MODE_TLB)) {
4274 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4275 bond_mode_name(bond_mode));
4276 } else {
4277 bond_opt_initstr(&newval, xmit_hash_policy);
4278 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4279 &newval);
4280 if (!valptr) {
4281 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4282 xmit_hash_policy);
4283 return -EINVAL;
4284 }
4285 xmit_hashtype = valptr->value;
4286 }
4287 }
4288
4289 if (lacp_rate) {
4290 if (bond_mode != BOND_MODE_8023AD) {
4291 pr_info("lacp_rate param is irrelevant in mode %s\n",
4292 bond_mode_name(bond_mode));
4293 } else {
4294 bond_opt_initstr(&newval, lacp_rate);
4295 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4296 &newval);
4297 if (!valptr) {
4298 pr_err("Error: Invalid lacp rate \"%s\"\n",
4299 lacp_rate);
4300 return -EINVAL;
4301 }
4302 lacp_fast = valptr->value;
4303 }
4304 }
4305
4306 if (ad_select) {
4307 bond_opt_initstr(&newval, ad_select);
4308 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4309 &newval);
4310 if (!valptr) {
4311 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4312 return -EINVAL;
4313 }
4314 params->ad_select = valptr->value;
4315 if (bond_mode != BOND_MODE_8023AD)
4316 pr_warn("ad_select param only affects 802.3ad mode\n");
4317 } else {
4318 params->ad_select = BOND_AD_STABLE;
4319 }
4320
4321 if (max_bonds < 0) {
4322 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4323 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4324 max_bonds = BOND_DEFAULT_MAX_BONDS;
4325 }
4326
4327 if (miimon < 0) {
4328 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4329 miimon, INT_MAX);
4330 miimon = 0;
4331 }
4332
4333 if (updelay < 0) {
4334 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4335 updelay, INT_MAX);
4336 updelay = 0;
4337 }
4338
4339 if (downdelay < 0) {
4340 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4341 downdelay, INT_MAX);
4342 downdelay = 0;
4343 }
4344
4345 if ((use_carrier != 0) && (use_carrier != 1)) {
4346 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4347 use_carrier);
4348 use_carrier = 1;
4349 }
4350
4351 if (num_peer_notif < 0 || num_peer_notif > 255) {
4352 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4353 num_peer_notif);
4354 num_peer_notif = 1;
4355 }
4356
4357 /* reset values for 802.3ad/TLB/ALB */
4358 if (!bond_mode_uses_arp(bond_mode)) {
4359 if (!miimon) {
4360 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");
4361 pr_warn("Forcing miimon to 100msec\n");
4362 miimon = BOND_DEFAULT_MIIMON;
4363 }
4364 }
4365
4366 if (tx_queues < 1 || tx_queues > 255) {
4367 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4368 tx_queues, BOND_DEFAULT_TX_QUEUES);
4369 tx_queues = BOND_DEFAULT_TX_QUEUES;
4370 }
4371
4372 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4373 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4374 all_slaves_active);
4375 all_slaves_active = 0;
4376 }
4377
4378 if (resend_igmp < 0 || resend_igmp > 255) {
4379 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4380 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4381 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4382 }
4383
4384 bond_opt_initval(&newval, packets_per_slave);
4385 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4386 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4387 packets_per_slave, USHRT_MAX);
4388 packets_per_slave = 1;
4389 }
4390
4391 if (bond_mode == BOND_MODE_ALB) {
4392 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",
4393 updelay);
4394 }
4395
4396 if (!miimon) {
4397 if (updelay || downdelay) {
4398 /* just warn the user the up/down delay will have
4399 * no effect since miimon is zero...
4400 */
4401 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",
4402 updelay, downdelay);
4403 }
4404 } else {
4405 /* don't allow arp monitoring */
4406 if (arp_interval) {
4407 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4408 miimon, arp_interval);
4409 arp_interval = 0;
4410 }
4411
4412 if ((updelay % miimon) != 0) {
4413 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4414 updelay, miimon, (updelay / miimon) * miimon);
4415 }
4416
4417 updelay /= miimon;
4418
4419 if ((downdelay % miimon) != 0) {
4420 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4421 downdelay, miimon,
4422 (downdelay / miimon) * miimon);
4423 }
4424
4425 downdelay /= miimon;
4426 }
4427
4428 if (arp_interval < 0) {
4429 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4430 arp_interval, INT_MAX);
4431 arp_interval = 0;
4432 }
4433
4434 for (arp_ip_count = 0, i = 0;
4435 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4436 __be32 ip;
4437
4438 /* not a complete check, but good enough to catch mistakes */
4439 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4440 !bond_is_ip_target_ok(ip)) {
4441 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4442 arp_ip_target[i]);
4443 arp_interval = 0;
4444 } else {
4445 if (bond_get_targets_ip(arp_target, ip) == -1)
4446 arp_target[arp_ip_count++] = ip;
4447 else
4448 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4449 &ip);
4450 }
4451 }
4452
4453 if (arp_interval && !arp_ip_count) {
4454 /* don't allow arping if no arp_ip_target given... */
4455 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4456 arp_interval);
4457 arp_interval = 0;
4458 }
4459
4460 if (arp_validate) {
4461 if (!arp_interval) {
4462 pr_err("arp_validate requires arp_interval\n");
4463 return -EINVAL;
4464 }
4465
4466 bond_opt_initstr(&newval, arp_validate);
4467 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4468 &newval);
4469 if (!valptr) {
4470 pr_err("Error: invalid arp_validate \"%s\"\n",
4471 arp_validate);
4472 return -EINVAL;
4473 }
4474 arp_validate_value = valptr->value;
4475 } else {
4476 arp_validate_value = 0;
4477 }
4478
4479 arp_all_targets_value = 0;
4480 if (arp_all_targets) {
4481 bond_opt_initstr(&newval, arp_all_targets);
4482 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4483 &newval);
4484 if (!valptr) {
4485 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4486 arp_all_targets);
4487 arp_all_targets_value = 0;
4488 } else {
4489 arp_all_targets_value = valptr->value;
4490 }
4491 }
4492
4493 if (miimon) {
4494 pr_info("MII link monitoring set to %d ms\n", miimon);
4495 } else if (arp_interval) {
4496 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4497 arp_validate_value);
4498 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4499 arp_interval, valptr->string, arp_ip_count);
4500
4501 for (i = 0; i < arp_ip_count; i++)
4502 pr_cont(" %s", arp_ip_target[i]);
4503
4504 pr_cont("\n");
4505
4506 } else if (max_bonds) {
4507 /* miimon and arp_interval not set, we need one so things
4508 * work as expected, see bonding.txt for details
4509 */
4510 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");
4511 }
4512
4513 if (primary && !bond_mode_uses_primary(bond_mode)) {
4514 /* currently, using a primary only makes sense
4515 * in active backup, TLB or ALB modes
4516 */
4517 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4518 primary, bond_mode_name(bond_mode));
4519 primary = NULL;
4520 }
4521
4522 if (primary && primary_reselect) {
4523 bond_opt_initstr(&newval, primary_reselect);
4524 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4525 &newval);
4526 if (!valptr) {
4527 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4528 primary_reselect);
4529 return -EINVAL;
4530 }
4531 primary_reselect_value = valptr->value;
4532 } else {
4533 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4534 }
4535
4536 if (fail_over_mac) {
4537 bond_opt_initstr(&newval, fail_over_mac);
4538 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4539 &newval);
4540 if (!valptr) {
4541 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4542 fail_over_mac);
4543 return -EINVAL;
4544 }
4545 fail_over_mac_value = valptr->value;
4546 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4547 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4548 } else {
4549 fail_over_mac_value = BOND_FOM_NONE;
4550 }
4551
4552 bond_opt_initstr(&newval, "default");
4553 valptr = bond_opt_parse(
4554 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4555 &newval);
4556 if (!valptr) {
4557 pr_err("Error: No ad_actor_sys_prio default value");
4558 return -EINVAL;
4559 }
4560 ad_actor_sys_prio = valptr->value;
4561
4562 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4563 &newval);
4564 if (!valptr) {
4565 pr_err("Error: No ad_user_port_key default value");
4566 return -EINVAL;
4567 }
4568 ad_user_port_key = valptr->value;
4569
4570 if (lp_interval == 0) {
4571 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4572 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4573 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4574 }
4575
4576 /* fill params struct with the proper values */
4577 params->mode = bond_mode;
4578 params->xmit_policy = xmit_hashtype;
4579 params->miimon = miimon;
4580 params->num_peer_notif = num_peer_notif;
4581 params->arp_interval = arp_interval;
4582 params->arp_validate = arp_validate_value;
4583 params->arp_all_targets = arp_all_targets_value;
4584 params->updelay = updelay;
4585 params->downdelay = downdelay;
4586 params->use_carrier = use_carrier;
4587 params->lacp_fast = lacp_fast;
4588 params->primary[0] = 0;
4589 params->primary_reselect = primary_reselect_value;
4590 params->fail_over_mac = fail_over_mac_value;
4591 params->tx_queues = tx_queues;
4592 params->all_slaves_active = all_slaves_active;
4593 params->resend_igmp = resend_igmp;
4594 params->min_links = min_links;
4595 params->lp_interval = lp_interval;
4596 params->packets_per_slave = packets_per_slave;
4597 params->tlb_dynamic_lb = 1; /* Default value */
4598 params->ad_actor_sys_prio = ad_actor_sys_prio;
4599 eth_zero_addr(params->ad_actor_system);
4600 params->ad_user_port_key = ad_user_port_key;
4601 if (packets_per_slave > 0) {
4602 params->reciprocal_packets_per_slave =
4603 reciprocal_value(packets_per_slave);
4604 } else {
4605 /* reciprocal_packets_per_slave is unused if
4606 * packets_per_slave is 0 or 1, just initialize it
4607 */
4608 params->reciprocal_packets_per_slave =
4609 (struct reciprocal_value) { 0 };
4610 }
4611
4612 if (primary) {
4613 strncpy(params->primary, primary, IFNAMSIZ);
4614 params->primary[IFNAMSIZ - 1] = 0;
4615 }
4616
4617 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4618
4619 return 0;
4620 }
4621
4622 /* Called from registration process */
4623 static int bond_init(struct net_device *bond_dev)
4624 {
4625 struct bonding *bond = netdev_priv(bond_dev);
4626 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4627
4628 netdev_dbg(bond_dev, "Begin bond_init\n");
4629
4630 bond->wq = create_singlethread_workqueue(bond_dev->name);
4631 if (!bond->wq)
4632 return -ENOMEM;
4633
4634 netdev_lockdep_set_classes(bond_dev);
4635
4636 list_add_tail(&bond->bond_list, &bn->dev_list);
4637
4638 bond_prepare_sysfs_group(bond);
4639
4640 bond_debug_register(bond);
4641
4642 /* Ensure valid dev_addr */
4643 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4644 bond_dev->addr_assign_type == NET_ADDR_PERM)
4645 eth_hw_addr_random(bond_dev);
4646
4647 return 0;
4648 }
4649
4650 unsigned int bond_get_num_tx_queues(void)
4651 {
4652 return tx_queues;
4653 }
4654
4655 /* Create a new bond based on the specified name and bonding parameters.
4656 * If name is NULL, obtain a suitable "bond%d" name for us.
4657 * Caller must NOT hold rtnl_lock; we need to release it here before we
4658 * set up our sysfs entries.
4659 */
4660 int bond_create(struct net *net, const char *name)
4661 {
4662 struct net_device *bond_dev;
4663 struct bonding *bond;
4664 struct alb_bond_info *bond_info;
4665 int res;
4666
4667 rtnl_lock();
4668
4669 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4670 name ? name : "bond%d", NET_NAME_UNKNOWN,
4671 bond_setup, tx_queues);
4672 if (!bond_dev) {
4673 pr_err("%s: eek! can't alloc netdev!\n", name);
4674 rtnl_unlock();
4675 return -ENOMEM;
4676 }
4677
4678 /*
4679 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4680 * It is set to 0 by default which is wrong.
4681 */
4682 bond = netdev_priv(bond_dev);
4683 bond_info = &(BOND_ALB_INFO(bond));
4684 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4685
4686 dev_net_set(bond_dev, net);
4687 bond_dev->rtnl_link_ops = &bond_link_ops;
4688
4689 res = register_netdevice(bond_dev);
4690
4691 netif_carrier_off(bond_dev);
4692
4693 rtnl_unlock();
4694 if (res < 0)
4695 bond_destructor(bond_dev);
4696 return res;
4697 }
4698
4699 static int __net_init bond_net_init(struct net *net)
4700 {
4701 struct bond_net *bn = net_generic(net, bond_net_id);
4702
4703 bn->net = net;
4704 INIT_LIST_HEAD(&bn->dev_list);
4705
4706 bond_create_proc_dir(bn);
4707 bond_create_sysfs(bn);
4708
4709 return 0;
4710 }
4711
4712 static void __net_exit bond_net_exit(struct net *net)
4713 {
4714 struct bond_net *bn = net_generic(net, bond_net_id);
4715 struct bonding *bond, *tmp_bond;
4716 LIST_HEAD(list);
4717
4718 bond_destroy_sysfs(bn);
4719
4720 /* Kill off any bonds created after unregistering bond rtnl ops */
4721 rtnl_lock();
4722 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4723 unregister_netdevice_queue(bond->dev, &list);
4724 unregister_netdevice_many(&list);
4725 rtnl_unlock();
4726
4727 bond_destroy_proc_dir(bn);
4728 }
4729
4730 static struct pernet_operations bond_net_ops = {
4731 .init = bond_net_init,
4732 .exit = bond_net_exit,
4733 .id = &bond_net_id,
4734 .size = sizeof(struct bond_net),
4735 };
4736
4737 static int __init bonding_init(void)
4738 {
4739 int i;
4740 int res;
4741
4742 pr_info("%s", bond_version);
4743
4744 res = bond_check_params(&bonding_defaults);
4745 if (res)
4746 goto out;
4747
4748 res = register_pernet_subsys(&bond_net_ops);
4749 if (res)
4750 goto out;
4751
4752 res = bond_netlink_init();
4753 if (res)
4754 goto err_link;
4755
4756 bond_create_debugfs();
4757
4758 for (i = 0; i < max_bonds; i++) {
4759 res = bond_create(&init_net, NULL);
4760 if (res)
4761 goto err;
4762 }
4763
4764 register_netdevice_notifier(&bond_netdev_notifier);
4765 out:
4766 return res;
4767 err:
4768 bond_destroy_debugfs();
4769 bond_netlink_fini();
4770 err_link:
4771 unregister_pernet_subsys(&bond_net_ops);
4772 goto out;
4773
4774 }
4775
4776 static void __exit bonding_exit(void)
4777 {
4778 unregister_netdevice_notifier(&bond_netdev_notifier);
4779
4780 bond_destroy_debugfs();
4781
4782 bond_netlink_fini();
4783 unregister_pernet_subsys(&bond_net_ops);
4784
4785 #ifdef CONFIG_NET_POLL_CONTROLLER
4786 /* Make sure we don't have an imbalance on our netpoll blocking */
4787 WARN_ON(atomic_read(&netpoll_block_tx));
4788 #endif
4789 }
4790
4791 module_init(bonding_init);
4792 module_exit(bonding_exit);
4793 MODULE_LICENSE("GPL");
4794 MODULE_VERSION(DRV_VERSION);
4795 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4796 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
Linux kernel - Deliverables
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