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Merge tag 'char-misc-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[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_ops->ndo_set_mac_address == NULL) {
1426 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1427 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1428 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1429 if (!bond_has_slaves(bond)) {
1430 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1431 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1432 } else {
1433 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");
1434 res = -EOPNOTSUPP;
1435 goto err_undo_flags;
1436 }
1437 }
1438 }
1439
1440 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1441
1442 /* If this is the first slave, then we need to set the master's hardware
1443 * address to be the same as the slave's.
1444 */
1445 if (!bond_has_slaves(bond) &&
1446 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1447 bond_set_dev_addr(bond->dev, slave_dev);
1448
1449 new_slave = bond_alloc_slave(bond);
1450 if (!new_slave) {
1451 res = -ENOMEM;
1452 goto err_undo_flags;
1453 }
1454
1455 new_slave->bond = bond;
1456 new_slave->dev = slave_dev;
1457 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1458 * is set via sysfs or module option if desired.
1459 */
1460 new_slave->queue_id = 0;
1461
1462 /* Save slave's original mtu and then set it to match the bond */
1463 new_slave->original_mtu = slave_dev->mtu;
1464 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1465 if (res) {
1466 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1467 goto err_free;
1468 }
1469
1470 /* Save slave's original ("permanent") mac address for modes
1471 * that need it, and for restoring it upon release, and then
1472 * set it to the master's address
1473 */
1474 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1475
1476 if (!bond->params.fail_over_mac ||
1477 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1478 /* Set slave to master's mac address. The application already
1479 * set the master's mac address to that of the first slave
1480 */
1481 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1482 addr.sa_family = slave_dev->type;
1483 res = dev_set_mac_address(slave_dev, &addr);
1484 if (res) {
1485 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1486 goto err_restore_mtu;
1487 }
1488 }
1489
1490 /* set slave flag before open to prevent IPv6 addrconf */
1491 slave_dev->flags |= IFF_SLAVE;
1492
1493 /* open the slave since the application closed it */
1494 res = dev_open(slave_dev);
1495 if (res) {
1496 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1497 goto err_restore_mac;
1498 }
1499
1500 slave_dev->priv_flags |= IFF_BONDING;
1501 /* initialize slave stats */
1502 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1503
1504 if (bond_is_lb(bond)) {
1505 /* bond_alb_init_slave() must be called before all other stages since
1506 * it might fail and we do not want to have to undo everything
1507 */
1508 res = bond_alb_init_slave(bond, new_slave);
1509 if (res)
1510 goto err_close;
1511 }
1512
1513 /* If the mode uses primary, then the following is handled by
1514 * bond_change_active_slave().
1515 */
1516 if (!bond_uses_primary(bond)) {
1517 /* set promiscuity level to new slave */
1518 if (bond_dev->flags & IFF_PROMISC) {
1519 res = dev_set_promiscuity(slave_dev, 1);
1520 if (res)
1521 goto err_close;
1522 }
1523
1524 /* set allmulti level to new slave */
1525 if (bond_dev->flags & IFF_ALLMULTI) {
1526 res = dev_set_allmulti(slave_dev, 1);
1527 if (res)
1528 goto err_close;
1529 }
1530
1531 netif_addr_lock_bh(bond_dev);
1532
1533 dev_mc_sync_multiple(slave_dev, bond_dev);
1534 dev_uc_sync_multiple(slave_dev, bond_dev);
1535
1536 netif_addr_unlock_bh(bond_dev);
1537 }
1538
1539 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1540 /* add lacpdu mc addr to mc list */
1541 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1542
1543 dev_mc_add(slave_dev, lacpdu_multicast);
1544 }
1545
1546 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1547 if (res) {
1548 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1549 slave_dev->name);
1550 goto err_close;
1551 }
1552
1553 prev_slave = bond_last_slave(bond);
1554
1555 new_slave->delay = 0;
1556 new_slave->link_failure_count = 0;
1557
1558 bond_update_speed_duplex(new_slave);
1559
1560 new_slave->last_rx = jiffies -
1561 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1562 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1563 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1564
1565 if (bond->params.miimon && !bond->params.use_carrier) {
1566 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1567
1568 if ((link_reporting == -1) && !bond->params.arp_interval) {
1569 /* miimon is set but a bonded network driver
1570 * does not support ETHTOOL/MII and
1571 * arp_interval is not set. Note: if
1572 * use_carrier is enabled, we will never go
1573 * here (because netif_carrier is always
1574 * supported); thus, we don't need to change
1575 * the messages for netif_carrier.
1576 */
1577 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",
1578 slave_dev->name);
1579 } else if (link_reporting == -1) {
1580 /* unable get link status using mii/ethtool */
1581 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",
1582 slave_dev->name);
1583 }
1584 }
1585
1586 /* check for initial state */
1587 new_slave->link = BOND_LINK_NOCHANGE;
1588 if (bond->params.miimon) {
1589 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1590 if (bond->params.updelay) {
1591 bond_set_slave_link_state(new_slave,
1592 BOND_LINK_BACK,
1593 BOND_SLAVE_NOTIFY_NOW);
1594 new_slave->delay = bond->params.updelay;
1595 } else {
1596 bond_set_slave_link_state(new_slave,
1597 BOND_LINK_UP,
1598 BOND_SLAVE_NOTIFY_NOW);
1599 }
1600 } else {
1601 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1602 BOND_SLAVE_NOTIFY_NOW);
1603 }
1604 } else if (bond->params.arp_interval) {
1605 bond_set_slave_link_state(new_slave,
1606 (netif_carrier_ok(slave_dev) ?
1607 BOND_LINK_UP : BOND_LINK_DOWN),
1608 BOND_SLAVE_NOTIFY_NOW);
1609 } else {
1610 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1611 BOND_SLAVE_NOTIFY_NOW);
1612 }
1613
1614 if (new_slave->link != BOND_LINK_DOWN)
1615 new_slave->last_link_up = jiffies;
1616 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1617 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1618 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1619
1620 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1621 /* if there is a primary slave, remember it */
1622 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1623 rcu_assign_pointer(bond->primary_slave, new_slave);
1624 bond->force_primary = true;
1625 }
1626 }
1627
1628 switch (BOND_MODE(bond)) {
1629 case BOND_MODE_ACTIVEBACKUP:
1630 bond_set_slave_inactive_flags(new_slave,
1631 BOND_SLAVE_NOTIFY_NOW);
1632 break;
1633 case BOND_MODE_8023AD:
1634 /* in 802.3ad mode, the internal mechanism
1635 * will activate the slaves in the selected
1636 * aggregator
1637 */
1638 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1639 /* if this is the first slave */
1640 if (!prev_slave) {
1641 SLAVE_AD_INFO(new_slave)->id = 1;
1642 /* Initialize AD with the number of times that the AD timer is called in 1 second
1643 * can be called only after the mac address of the bond is set
1644 */
1645 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1646 } else {
1647 SLAVE_AD_INFO(new_slave)->id =
1648 SLAVE_AD_INFO(prev_slave)->id + 1;
1649 }
1650
1651 bond_3ad_bind_slave(new_slave);
1652 break;
1653 case BOND_MODE_TLB:
1654 case BOND_MODE_ALB:
1655 bond_set_active_slave(new_slave);
1656 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1657 break;
1658 default:
1659 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1660
1661 /* always active in trunk mode */
1662 bond_set_active_slave(new_slave);
1663
1664 /* In trunking mode there is little meaning to curr_active_slave
1665 * anyway (it holds no special properties of the bond device),
1666 * so we can change it without calling change_active_interface()
1667 */
1668 if (!rcu_access_pointer(bond->curr_active_slave) &&
1669 new_slave->link == BOND_LINK_UP)
1670 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1671
1672 break;
1673 } /* switch(bond_mode) */
1674
1675 #ifdef CONFIG_NET_POLL_CONTROLLER
1676 slave_dev->npinfo = bond->dev->npinfo;
1677 if (slave_dev->npinfo) {
1678 if (slave_enable_netpoll(new_slave)) {
1679 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1680 res = -EBUSY;
1681 goto err_detach;
1682 }
1683 }
1684 #endif
1685
1686 if (!(bond_dev->features & NETIF_F_LRO))
1687 dev_disable_lro(slave_dev);
1688
1689 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1690 new_slave);
1691 if (res) {
1692 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1693 goto err_detach;
1694 }
1695
1696 res = bond_master_upper_dev_link(bond, new_slave);
1697 if (res) {
1698 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1699 goto err_unregister;
1700 }
1701
1702 res = bond_sysfs_slave_add(new_slave);
1703 if (res) {
1704 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1705 goto err_upper_unlink;
1706 }
1707
1708 bond->slave_cnt++;
1709 bond_compute_features(bond);
1710 bond_set_carrier(bond);
1711
1712 if (bond_uses_primary(bond)) {
1713 block_netpoll_tx();
1714 bond_select_active_slave(bond);
1715 unblock_netpoll_tx();
1716 }
1717
1718 if (bond_mode_uses_xmit_hash(bond))
1719 bond_update_slave_arr(bond, NULL);
1720
1721 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1722 slave_dev->name,
1723 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1724 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1725
1726 /* enslave is successful */
1727 bond_queue_slave_event(new_slave);
1728 return 0;
1729
1730 /* Undo stages on error */
1731 err_upper_unlink:
1732 bond_upper_dev_unlink(bond, new_slave);
1733
1734 err_unregister:
1735 netdev_rx_handler_unregister(slave_dev);
1736
1737 err_detach:
1738 if (!bond_uses_primary(bond))
1739 bond_hw_addr_flush(bond_dev, slave_dev);
1740
1741 vlan_vids_del_by_dev(slave_dev, bond_dev);
1742 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1743 RCU_INIT_POINTER(bond->primary_slave, NULL);
1744 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1745 block_netpoll_tx();
1746 bond_change_active_slave(bond, NULL);
1747 bond_select_active_slave(bond);
1748 unblock_netpoll_tx();
1749 }
1750 /* either primary_slave or curr_active_slave might've changed */
1751 synchronize_rcu();
1752 slave_disable_netpoll(new_slave);
1753
1754 err_close:
1755 slave_dev->priv_flags &= ~IFF_BONDING;
1756 dev_close(slave_dev);
1757
1758 err_restore_mac:
1759 slave_dev->flags &= ~IFF_SLAVE;
1760 if (!bond->params.fail_over_mac ||
1761 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1762 /* XXX TODO - fom follow mode needs to change master's
1763 * MAC if this slave's MAC is in use by the bond, or at
1764 * least print a warning.
1765 */
1766 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1767 addr.sa_family = slave_dev->type;
1768 dev_set_mac_address(slave_dev, &addr);
1769 }
1770
1771 err_restore_mtu:
1772 dev_set_mtu(slave_dev, new_slave->original_mtu);
1773
1774 err_free:
1775 bond_free_slave(new_slave);
1776
1777 err_undo_flags:
1778 /* Enslave of first slave has failed and we need to fix master's mac */
1779 if (!bond_has_slaves(bond)) {
1780 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1781 slave_dev->dev_addr))
1782 eth_hw_addr_random(bond_dev);
1783 if (bond_dev->type != ARPHRD_ETHER) {
1784 dev_close(bond_dev);
1785 ether_setup(bond_dev);
1786 bond_dev->flags |= IFF_MASTER;
1787 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1788 }
1789 }
1790
1791 return res;
1792 }
1793
1794 /* Try to release the slave device <slave> from the bond device <master>
1795 * It is legal to access curr_active_slave without a lock because all the function
1796 * is RTNL-locked. If "all" is true it means that the function is being called
1797 * while destroying a bond interface and all slaves are being released.
1798 *
1799 * The rules for slave state should be:
1800 * for Active/Backup:
1801 * Active stays on all backups go down
1802 * for Bonded connections:
1803 * The first up interface should be left on and all others downed.
1804 */
1805 static int __bond_release_one(struct net_device *bond_dev,
1806 struct net_device *slave_dev,
1807 bool all)
1808 {
1809 struct bonding *bond = netdev_priv(bond_dev);
1810 struct slave *slave, *oldcurrent;
1811 struct sockaddr addr;
1812 int old_flags = bond_dev->flags;
1813 netdev_features_t old_features = bond_dev->features;
1814
1815 /* slave is not a slave or master is not master of this slave */
1816 if (!(slave_dev->flags & IFF_SLAVE) ||
1817 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1818 netdev_dbg(bond_dev, "cannot release %s\n",
1819 slave_dev->name);
1820 return -EINVAL;
1821 }
1822
1823 block_netpoll_tx();
1824
1825 slave = bond_get_slave_by_dev(bond, slave_dev);
1826 if (!slave) {
1827 /* not a slave of this bond */
1828 netdev_info(bond_dev, "%s not enslaved\n",
1829 slave_dev->name);
1830 unblock_netpoll_tx();
1831 return -EINVAL;
1832 }
1833
1834 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1835
1836 bond_sysfs_slave_del(slave);
1837
1838 /* recompute stats just before removing the slave */
1839 bond_get_stats(bond->dev, &bond->bond_stats);
1840
1841 bond_upper_dev_unlink(bond, slave);
1842 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1843 * for this slave anymore.
1844 */
1845 netdev_rx_handler_unregister(slave_dev);
1846
1847 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1848 bond_3ad_unbind_slave(slave);
1849
1850 if (bond_mode_uses_xmit_hash(bond))
1851 bond_update_slave_arr(bond, slave);
1852
1853 netdev_info(bond_dev, "Releasing %s interface %s\n",
1854 bond_is_active_slave(slave) ? "active" : "backup",
1855 slave_dev->name);
1856
1857 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1858
1859 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1860
1861 if (!all && (!bond->params.fail_over_mac ||
1862 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1863 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1864 bond_has_slaves(bond))
1865 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",
1866 slave_dev->name, slave->perm_hwaddr,
1867 bond_dev->name, slave_dev->name);
1868 }
1869
1870 if (rtnl_dereference(bond->primary_slave) == slave)
1871 RCU_INIT_POINTER(bond->primary_slave, NULL);
1872
1873 if (oldcurrent == slave)
1874 bond_change_active_slave(bond, NULL);
1875
1876 if (bond_is_lb(bond)) {
1877 /* Must be called only after the slave has been
1878 * detached from the list and the curr_active_slave
1879 * has been cleared (if our_slave == old_current),
1880 * but before a new active slave is selected.
1881 */
1882 bond_alb_deinit_slave(bond, slave);
1883 }
1884
1885 if (all) {
1886 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1887 } else if (oldcurrent == slave) {
1888 /* Note that we hold RTNL over this sequence, so there
1889 * is no concern that another slave add/remove event
1890 * will interfere.
1891 */
1892 bond_select_active_slave(bond);
1893 }
1894
1895 if (!bond_has_slaves(bond)) {
1896 bond_set_carrier(bond);
1897 eth_hw_addr_random(bond_dev);
1898 }
1899
1900 unblock_netpoll_tx();
1901 synchronize_rcu();
1902 bond->slave_cnt--;
1903
1904 if (!bond_has_slaves(bond)) {
1905 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1906 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1907 }
1908
1909 bond_compute_features(bond);
1910 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1911 (old_features & NETIF_F_VLAN_CHALLENGED))
1912 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1913 slave_dev->name, bond_dev->name);
1914
1915 vlan_vids_del_by_dev(slave_dev, bond_dev);
1916
1917 /* If the mode uses primary, then this case was handled above by
1918 * bond_change_active_slave(..., NULL)
1919 */
1920 if (!bond_uses_primary(bond)) {
1921 /* unset promiscuity level from slave
1922 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1923 * of the IFF_PROMISC flag in the bond_dev, but we need the
1924 * value of that flag before that change, as that was the value
1925 * when this slave was attached, so we cache at the start of the
1926 * function and use it here. Same goes for ALLMULTI below
1927 */
1928 if (old_flags & IFF_PROMISC)
1929 dev_set_promiscuity(slave_dev, -1);
1930
1931 /* unset allmulti level from slave */
1932 if (old_flags & IFF_ALLMULTI)
1933 dev_set_allmulti(slave_dev, -1);
1934
1935 bond_hw_addr_flush(bond_dev, slave_dev);
1936 }
1937
1938 slave_disable_netpoll(slave);
1939
1940 /* close slave before restoring its mac address */
1941 dev_close(slave_dev);
1942
1943 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1944 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1945 /* restore original ("permanent") mac address */
1946 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1947 addr.sa_family = slave_dev->type;
1948 dev_set_mac_address(slave_dev, &addr);
1949 }
1950
1951 dev_set_mtu(slave_dev, slave->original_mtu);
1952
1953 slave_dev->priv_flags &= ~IFF_BONDING;
1954
1955 bond_free_slave(slave);
1956
1957 return 0;
1958 }
1959
1960 /* A wrapper used because of ndo_del_link */
1961 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1962 {
1963 return __bond_release_one(bond_dev, slave_dev, false);
1964 }
1965
1966 /* First release a slave and then destroy the bond if no more slaves are left.
1967 * Must be under rtnl_lock when this function is called.
1968 */
1969 static int bond_release_and_destroy(struct net_device *bond_dev,
1970 struct net_device *slave_dev)
1971 {
1972 struct bonding *bond = netdev_priv(bond_dev);
1973 int ret;
1974
1975 ret = bond_release(bond_dev, slave_dev);
1976 if (ret == 0 && !bond_has_slaves(bond)) {
1977 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1978 netdev_info(bond_dev, "Destroying bond %s\n",
1979 bond_dev->name);
1980 bond_remove_proc_entry(bond);
1981 unregister_netdevice(bond_dev);
1982 }
1983 return ret;
1984 }
1985
1986 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1987 {
1988 struct bonding *bond = netdev_priv(bond_dev);
1989 bond_fill_ifbond(bond, info);
1990 return 0;
1991 }
1992
1993 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1994 {
1995 struct bonding *bond = netdev_priv(bond_dev);
1996 struct list_head *iter;
1997 int i = 0, res = -ENODEV;
1998 struct slave *slave;
1999
2000 bond_for_each_slave(bond, slave, iter) {
2001 if (i++ == (int)info->slave_id) {
2002 res = 0;
2003 bond_fill_ifslave(slave, info);
2004 break;
2005 }
2006 }
2007
2008 return res;
2009 }
2010
2011 /*-------------------------------- Monitoring -------------------------------*/
2012
2013 /* called with rcu_read_lock() */
2014 static int bond_miimon_inspect(struct bonding *bond)
2015 {
2016 int link_state, commit = 0;
2017 struct list_head *iter;
2018 struct slave *slave;
2019 bool ignore_updelay;
2020
2021 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2022
2023 bond_for_each_slave_rcu(bond, slave, iter) {
2024 slave->new_link = BOND_LINK_NOCHANGE;
2025
2026 link_state = bond_check_dev_link(bond, slave->dev, 0);
2027
2028 switch (slave->link) {
2029 case BOND_LINK_UP:
2030 if (link_state)
2031 continue;
2032
2033 bond_set_slave_link_state(slave, BOND_LINK_FAIL,
2034 BOND_SLAVE_NOTIFY_LATER);
2035 slave->delay = bond->params.downdelay;
2036 if (slave->delay) {
2037 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2038 (BOND_MODE(bond) ==
2039 BOND_MODE_ACTIVEBACKUP) ?
2040 (bond_is_active_slave(slave) ?
2041 "active " : "backup ") : "",
2042 slave->dev->name,
2043 bond->params.downdelay * bond->params.miimon);
2044 }
2045 /*FALLTHRU*/
2046 case BOND_LINK_FAIL:
2047 if (link_state) {
2048 /* recovered before downdelay expired */
2049 bond_set_slave_link_state(slave, BOND_LINK_UP,
2050 BOND_SLAVE_NOTIFY_LATER);
2051 slave->last_link_up = jiffies;
2052 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2053 (bond->params.downdelay - slave->delay) *
2054 bond->params.miimon,
2055 slave->dev->name);
2056 continue;
2057 }
2058
2059 if (slave->delay <= 0) {
2060 slave->new_link = BOND_LINK_DOWN;
2061 commit++;
2062 continue;
2063 }
2064
2065 slave->delay--;
2066 break;
2067
2068 case BOND_LINK_DOWN:
2069 if (!link_state)
2070 continue;
2071
2072 bond_set_slave_link_state(slave, BOND_LINK_BACK,
2073 BOND_SLAVE_NOTIFY_LATER);
2074 slave->delay = bond->params.updelay;
2075
2076 if (slave->delay) {
2077 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2078 slave->dev->name,
2079 ignore_updelay ? 0 :
2080 bond->params.updelay *
2081 bond->params.miimon);
2082 }
2083 /*FALLTHRU*/
2084 case BOND_LINK_BACK:
2085 if (!link_state) {
2086 bond_set_slave_link_state(slave,
2087 BOND_LINK_DOWN,
2088 BOND_SLAVE_NOTIFY_LATER);
2089 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2090 (bond->params.updelay - slave->delay) *
2091 bond->params.miimon,
2092 slave->dev->name);
2093
2094 continue;
2095 }
2096
2097 if (ignore_updelay)
2098 slave->delay = 0;
2099
2100 if (slave->delay <= 0) {
2101 slave->new_link = BOND_LINK_UP;
2102 commit++;
2103 ignore_updelay = false;
2104 continue;
2105 }
2106
2107 slave->delay--;
2108 break;
2109 }
2110 }
2111
2112 return commit;
2113 }
2114
2115 static void bond_miimon_commit(struct bonding *bond)
2116 {
2117 struct list_head *iter;
2118 struct slave *slave, *primary;
2119
2120 bond_for_each_slave(bond, slave, iter) {
2121 switch (slave->new_link) {
2122 case BOND_LINK_NOCHANGE:
2123 continue;
2124
2125 case BOND_LINK_UP:
2126 bond_update_speed_duplex(slave);
2127 bond_set_slave_link_state(slave, BOND_LINK_UP,
2128 BOND_SLAVE_NOTIFY_NOW);
2129 slave->last_link_up = jiffies;
2130
2131 primary = rtnl_dereference(bond->primary_slave);
2132 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2133 /* prevent it from being the active one */
2134 bond_set_backup_slave(slave);
2135 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2136 /* make it immediately active */
2137 bond_set_active_slave(slave);
2138 } else if (slave != primary) {
2139 /* prevent it from being the active one */
2140 bond_set_backup_slave(slave);
2141 }
2142
2143 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2144 slave->dev->name,
2145 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2146 slave->duplex ? "full" : "half");
2147
2148 /* notify ad that the link status has changed */
2149 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2150 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2151
2152 if (bond_is_lb(bond))
2153 bond_alb_handle_link_change(bond, slave,
2154 BOND_LINK_UP);
2155
2156 if (BOND_MODE(bond) == BOND_MODE_XOR)
2157 bond_update_slave_arr(bond, NULL);
2158
2159 if (!bond->curr_active_slave || slave == primary)
2160 goto do_failover;
2161
2162 continue;
2163
2164 case BOND_LINK_DOWN:
2165 if (slave->link_failure_count < UINT_MAX)
2166 slave->link_failure_count++;
2167
2168 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2169 BOND_SLAVE_NOTIFY_NOW);
2170
2171 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2172 BOND_MODE(bond) == BOND_MODE_8023AD)
2173 bond_set_slave_inactive_flags(slave,
2174 BOND_SLAVE_NOTIFY_NOW);
2175
2176 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2177 slave->dev->name);
2178
2179 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2180 bond_3ad_handle_link_change(slave,
2181 BOND_LINK_DOWN);
2182
2183 if (bond_is_lb(bond))
2184 bond_alb_handle_link_change(bond, slave,
2185 BOND_LINK_DOWN);
2186
2187 if (BOND_MODE(bond) == BOND_MODE_XOR)
2188 bond_update_slave_arr(bond, NULL);
2189
2190 if (slave == rcu_access_pointer(bond->curr_active_slave))
2191 goto do_failover;
2192
2193 continue;
2194
2195 default:
2196 netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2197 slave->new_link, slave->dev->name);
2198 slave->new_link = BOND_LINK_NOCHANGE;
2199
2200 continue;
2201 }
2202
2203 do_failover:
2204 block_netpoll_tx();
2205 bond_select_active_slave(bond);
2206 unblock_netpoll_tx();
2207 }
2208
2209 bond_set_carrier(bond);
2210 }
2211
2212 /* bond_mii_monitor
2213 *
2214 * Really a wrapper that splits the mii monitor into two phases: an
2215 * inspection, then (if inspection indicates something needs to be done)
2216 * an acquisition of appropriate locks followed by a commit phase to
2217 * implement whatever link state changes are indicated.
2218 */
2219 static void bond_mii_monitor(struct work_struct *work)
2220 {
2221 struct bonding *bond = container_of(work, struct bonding,
2222 mii_work.work);
2223 bool should_notify_peers = false;
2224 unsigned long delay;
2225
2226 delay = msecs_to_jiffies(bond->params.miimon);
2227
2228 if (!bond_has_slaves(bond))
2229 goto re_arm;
2230
2231 rcu_read_lock();
2232
2233 should_notify_peers = bond_should_notify_peers(bond);
2234
2235 if (bond_miimon_inspect(bond)) {
2236 rcu_read_unlock();
2237
2238 /* Race avoidance with bond_close cancel of workqueue */
2239 if (!rtnl_trylock()) {
2240 delay = 1;
2241 should_notify_peers = false;
2242 goto re_arm;
2243 }
2244
2245 bond_miimon_commit(bond);
2246
2247 rtnl_unlock(); /* might sleep, hold no other locks */
2248 } else
2249 rcu_read_unlock();
2250
2251 re_arm:
2252 if (bond->params.miimon)
2253 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2254
2255 if (should_notify_peers) {
2256 if (!rtnl_trylock())
2257 return;
2258 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2259 rtnl_unlock();
2260 }
2261 }
2262
2263 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2264 {
2265 struct net_device *upper;
2266 struct list_head *iter;
2267 bool ret = false;
2268
2269 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2270 return true;
2271
2272 rcu_read_lock();
2273 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2274 if (ip == bond_confirm_addr(upper, 0, ip)) {
2275 ret = true;
2276 break;
2277 }
2278 }
2279 rcu_read_unlock();
2280
2281 return ret;
2282 }
2283
2284 /* We go to the (large) trouble of VLAN tagging ARP frames because
2285 * switches in VLAN mode (especially if ports are configured as
2286 * "native" to a VLAN) might not pass non-tagged frames.
2287 */
2288 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2289 __be32 dest_ip, __be32 src_ip,
2290 struct bond_vlan_tag *tags)
2291 {
2292 struct sk_buff *skb;
2293 struct bond_vlan_tag *outer_tag = tags;
2294
2295 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2296 arp_op, slave_dev->name, &dest_ip, &src_ip);
2297
2298 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2299 NULL, slave_dev->dev_addr, NULL);
2300
2301 if (!skb) {
2302 net_err_ratelimited("ARP packet allocation failed\n");
2303 return;
2304 }
2305
2306 if (!tags || tags->vlan_proto == VLAN_N_VID)
2307 goto xmit;
2308
2309 tags++;
2310
2311 /* Go through all the tags backwards and add them to the packet */
2312 while (tags->vlan_proto != VLAN_N_VID) {
2313 if (!tags->vlan_id) {
2314 tags++;
2315 continue;
2316 }
2317
2318 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2319 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2320 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2321 tags->vlan_id);
2322 if (!skb) {
2323 net_err_ratelimited("failed to insert inner VLAN tag\n");
2324 return;
2325 }
2326
2327 tags++;
2328 }
2329 /* Set the outer tag */
2330 if (outer_tag->vlan_id) {
2331 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2332 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2333 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2334 outer_tag->vlan_id);
2335 }
2336
2337 xmit:
2338 arp_xmit(skb);
2339 }
2340
2341 /* Validate the device path between the @start_dev and the @end_dev.
2342 * The path is valid if the @end_dev is reachable through device
2343 * stacking.
2344 * When the path is validated, collect any vlan information in the
2345 * path.
2346 */
2347 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2348 struct net_device *end_dev,
2349 int level)
2350 {
2351 struct bond_vlan_tag *tags;
2352 struct net_device *upper;
2353 struct list_head *iter;
2354
2355 if (start_dev == end_dev) {
2356 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2357 if (!tags)
2358 return ERR_PTR(-ENOMEM);
2359 tags[level].vlan_proto = VLAN_N_VID;
2360 return tags;
2361 }
2362
2363 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2364 tags = bond_verify_device_path(upper, end_dev, level + 1);
2365 if (IS_ERR_OR_NULL(tags)) {
2366 if (IS_ERR(tags))
2367 return tags;
2368 continue;
2369 }
2370 if (is_vlan_dev(upper)) {
2371 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2372 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2373 }
2374
2375 return tags;
2376 }
2377
2378 return NULL;
2379 }
2380
2381 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2382 {
2383 struct rtable *rt;
2384 struct bond_vlan_tag *tags;
2385 __be32 *targets = bond->params.arp_targets, addr;
2386 int i;
2387
2388 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2389 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2390 tags = NULL;
2391
2392 /* Find out through which dev should the packet go */
2393 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2394 RTO_ONLINK, 0);
2395 if (IS_ERR(rt)) {
2396 /* there's no route to target - try to send arp
2397 * probe to generate any traffic (arp_validate=0)
2398 */
2399 if (bond->params.arp_validate)
2400 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2401 bond->dev->name,
2402 &targets[i]);
2403 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2404 0, tags);
2405 continue;
2406 }
2407
2408 /* bond device itself */
2409 if (rt->dst.dev == bond->dev)
2410 goto found;
2411
2412 rcu_read_lock();
2413 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2414 rcu_read_unlock();
2415
2416 if (!IS_ERR_OR_NULL(tags))
2417 goto found;
2418
2419 /* Not our device - skip */
2420 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2421 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2422
2423 ip_rt_put(rt);
2424 continue;
2425
2426 found:
2427 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2428 ip_rt_put(rt);
2429 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2430 addr, tags);
2431 kfree(tags);
2432 }
2433 }
2434
2435 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2436 {
2437 int i;
2438
2439 if (!sip || !bond_has_this_ip(bond, tip)) {
2440 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2441 &sip, &tip);
2442 return;
2443 }
2444
2445 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2446 if (i == -1) {
2447 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2448 &sip);
2449 return;
2450 }
2451 slave->last_rx = jiffies;
2452 slave->target_last_arp_rx[i] = jiffies;
2453 }
2454
2455 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2456 struct slave *slave)
2457 {
2458 struct arphdr *arp = (struct arphdr *)skb->data;
2459 struct slave *curr_active_slave, *curr_arp_slave;
2460 unsigned char *arp_ptr;
2461 __be32 sip, tip;
2462 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2463
2464 if (!slave_do_arp_validate(bond, slave)) {
2465 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2466 !slave_do_arp_validate_only(bond))
2467 slave->last_rx = jiffies;
2468 return RX_HANDLER_ANOTHER;
2469 } else if (!is_arp) {
2470 return RX_HANDLER_ANOTHER;
2471 }
2472
2473 alen = arp_hdr_len(bond->dev);
2474
2475 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2476 skb->dev->name);
2477
2478 if (alen > skb_headlen(skb)) {
2479 arp = kmalloc(alen, GFP_ATOMIC);
2480 if (!arp)
2481 goto out_unlock;
2482 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2483 goto out_unlock;
2484 }
2485
2486 if (arp->ar_hln != bond->dev->addr_len ||
2487 skb->pkt_type == PACKET_OTHERHOST ||
2488 skb->pkt_type == PACKET_LOOPBACK ||
2489 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2490 arp->ar_pro != htons(ETH_P_IP) ||
2491 arp->ar_pln != 4)
2492 goto out_unlock;
2493
2494 arp_ptr = (unsigned char *)(arp + 1);
2495 arp_ptr += bond->dev->addr_len;
2496 memcpy(&sip, arp_ptr, 4);
2497 arp_ptr += 4 + bond->dev->addr_len;
2498 memcpy(&tip, arp_ptr, 4);
2499
2500 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2501 slave->dev->name, bond_slave_state(slave),
2502 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2503 &sip, &tip);
2504
2505 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2506 curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2507
2508 /* We 'trust' the received ARP enough to validate it if:
2509 *
2510 * (a) the slave receiving the ARP is active (which includes the
2511 * current ARP slave, if any), or
2512 *
2513 * (b) the receiving slave isn't active, but there is a currently
2514 * active slave and it received valid arp reply(s) after it became
2515 * the currently active slave, or
2516 *
2517 * (c) there is an ARP slave that sent an ARP during the prior ARP
2518 * interval, and we receive an ARP reply on any slave. We accept
2519 * these because switch FDB update delays may deliver the ARP
2520 * reply to a slave other than the sender of the ARP request.
2521 *
2522 * Note: for (b), backup slaves are receiving the broadcast ARP
2523 * request, not a reply. This request passes from the sending
2524 * slave through the L2 switch(es) to the receiving slave. Since
2525 * this is checking the request, sip/tip are swapped for
2526 * validation.
2527 *
2528 * This is done to avoid endless looping when we can't reach the
2529 * arp_ip_target and fool ourselves with our own arp requests.
2530 */
2531 if (bond_is_active_slave(slave))
2532 bond_validate_arp(bond, slave, sip, tip);
2533 else if (curr_active_slave &&
2534 time_after(slave_last_rx(bond, curr_active_slave),
2535 curr_active_slave->last_link_up))
2536 bond_validate_arp(bond, slave, tip, sip);
2537 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2538 bond_time_in_interval(bond,
2539 dev_trans_start(curr_arp_slave->dev), 1))
2540 bond_validate_arp(bond, slave, sip, tip);
2541
2542 out_unlock:
2543 if (arp != (struct arphdr *)skb->data)
2544 kfree(arp);
2545 return RX_HANDLER_ANOTHER;
2546 }
2547
2548 /* function to verify if we're in the arp_interval timeslice, returns true if
2549 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2550 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2551 */
2552 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2553 int mod)
2554 {
2555 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2556
2557 return time_in_range(jiffies,
2558 last_act - delta_in_ticks,
2559 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2560 }
2561
2562 /* This function is called regularly to monitor each slave's link
2563 * ensuring that traffic is being sent and received when arp monitoring
2564 * is used in load-balancing mode. if the adapter has been dormant, then an
2565 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2566 * arp monitoring in active backup mode.
2567 */
2568 static void bond_loadbalance_arp_mon(struct work_struct *work)
2569 {
2570 struct bonding *bond = container_of(work, struct bonding,
2571 arp_work.work);
2572 struct slave *slave, *oldcurrent;
2573 struct list_head *iter;
2574 int do_failover = 0, slave_state_changed = 0;
2575
2576 if (!bond_has_slaves(bond))
2577 goto re_arm;
2578
2579 rcu_read_lock();
2580
2581 oldcurrent = rcu_dereference(bond->curr_active_slave);
2582 /* see if any of the previous devices are up now (i.e. they have
2583 * xmt and rcv traffic). the curr_active_slave does not come into
2584 * the picture unless it is null. also, slave->last_link_up is not
2585 * needed here because we send an arp on each slave and give a slave
2586 * as long as it needs to get the tx/rx within the delta.
2587 * TODO: what about up/down delay in arp mode? it wasn't here before
2588 * so it can wait
2589 */
2590 bond_for_each_slave_rcu(bond, slave, iter) {
2591 unsigned long trans_start = dev_trans_start(slave->dev);
2592
2593 if (slave->link != BOND_LINK_UP) {
2594 if (bond_time_in_interval(bond, trans_start, 1) &&
2595 bond_time_in_interval(bond, slave->last_rx, 1)) {
2596
2597 slave->link = BOND_LINK_UP;
2598 slave_state_changed = 1;
2599
2600 /* primary_slave has no meaning in round-robin
2601 * mode. the window of a slave being up and
2602 * curr_active_slave being null after enslaving
2603 * is closed.
2604 */
2605 if (!oldcurrent) {
2606 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2607 slave->dev->name);
2608 do_failover = 1;
2609 } else {
2610 netdev_info(bond->dev, "interface %s is now up\n",
2611 slave->dev->name);
2612 }
2613 }
2614 } else {
2615 /* slave->link == BOND_LINK_UP */
2616
2617 /* not all switches will respond to an arp request
2618 * when the source ip is 0, so don't take the link down
2619 * if we don't know our ip yet
2620 */
2621 if (!bond_time_in_interval(bond, trans_start, 2) ||
2622 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2623
2624 slave->link = BOND_LINK_DOWN;
2625 slave_state_changed = 1;
2626
2627 if (slave->link_failure_count < UINT_MAX)
2628 slave->link_failure_count++;
2629
2630 netdev_info(bond->dev, "interface %s is now down\n",
2631 slave->dev->name);
2632
2633 if (slave == oldcurrent)
2634 do_failover = 1;
2635 }
2636 }
2637
2638 /* note: if switch is in round-robin mode, all links
2639 * must tx arp to ensure all links rx an arp - otherwise
2640 * links may oscillate or not come up at all; if switch is
2641 * in something like xor mode, there is nothing we can
2642 * do - all replies will be rx'ed on same link causing slaves
2643 * to be unstable during low/no traffic periods
2644 */
2645 if (bond_slave_is_up(slave))
2646 bond_arp_send_all(bond, slave);
2647 }
2648
2649 rcu_read_unlock();
2650
2651 if (do_failover || slave_state_changed) {
2652 if (!rtnl_trylock())
2653 goto re_arm;
2654
2655 if (slave_state_changed) {
2656 bond_slave_state_change(bond);
2657 if (BOND_MODE(bond) == BOND_MODE_XOR)
2658 bond_update_slave_arr(bond, NULL);
2659 }
2660 if (do_failover) {
2661 block_netpoll_tx();
2662 bond_select_active_slave(bond);
2663 unblock_netpoll_tx();
2664 }
2665 rtnl_unlock();
2666 }
2667
2668 re_arm:
2669 if (bond->params.arp_interval)
2670 queue_delayed_work(bond->wq, &bond->arp_work,
2671 msecs_to_jiffies(bond->params.arp_interval));
2672 }
2673
2674 /* Called to inspect slaves for active-backup mode ARP monitor link state
2675 * changes. Sets new_link in slaves to specify what action should take
2676 * place for the slave. Returns 0 if no changes are found, >0 if changes
2677 * to link states must be committed.
2678 *
2679 * Called with rcu_read_lock held.
2680 */
2681 static int bond_ab_arp_inspect(struct bonding *bond)
2682 {
2683 unsigned long trans_start, last_rx;
2684 struct list_head *iter;
2685 struct slave *slave;
2686 int commit = 0;
2687
2688 bond_for_each_slave_rcu(bond, slave, iter) {
2689 slave->new_link = BOND_LINK_NOCHANGE;
2690 last_rx = slave_last_rx(bond, slave);
2691
2692 if (slave->link != BOND_LINK_UP) {
2693 if (bond_time_in_interval(bond, last_rx, 1)) {
2694 slave->new_link = BOND_LINK_UP;
2695 commit++;
2696 }
2697 continue;
2698 }
2699
2700 /* Give slaves 2*delta after being enslaved or made
2701 * active. This avoids bouncing, as the last receive
2702 * times need a full ARP monitor cycle to be updated.
2703 */
2704 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2705 continue;
2706
2707 /* Backup slave is down if:
2708 * - No current_arp_slave AND
2709 * - more than 3*delta since last receive AND
2710 * - the bond has an IP address
2711 *
2712 * Note: a non-null current_arp_slave indicates
2713 * the curr_active_slave went down and we are
2714 * searching for a new one; under this condition
2715 * we only take the curr_active_slave down - this
2716 * gives each slave a chance to tx/rx traffic
2717 * before being taken out
2718 */
2719 if (!bond_is_active_slave(slave) &&
2720 !rcu_access_pointer(bond->current_arp_slave) &&
2721 !bond_time_in_interval(bond, last_rx, 3)) {
2722 slave->new_link = BOND_LINK_DOWN;
2723 commit++;
2724 }
2725
2726 /* Active slave is down if:
2727 * - more than 2*delta since transmitting OR
2728 * - (more than 2*delta since receive AND
2729 * the bond has an IP address)
2730 */
2731 trans_start = dev_trans_start(slave->dev);
2732 if (bond_is_active_slave(slave) &&
2733 (!bond_time_in_interval(bond, trans_start, 2) ||
2734 !bond_time_in_interval(bond, last_rx, 2))) {
2735 slave->new_link = BOND_LINK_DOWN;
2736 commit++;
2737 }
2738 }
2739
2740 return commit;
2741 }
2742
2743 /* Called to commit link state changes noted by inspection step of
2744 * active-backup mode ARP monitor.
2745 *
2746 * Called with RTNL hold.
2747 */
2748 static void bond_ab_arp_commit(struct bonding *bond)
2749 {
2750 unsigned long trans_start;
2751 struct list_head *iter;
2752 struct slave *slave;
2753
2754 bond_for_each_slave(bond, slave, iter) {
2755 switch (slave->new_link) {
2756 case BOND_LINK_NOCHANGE:
2757 continue;
2758
2759 case BOND_LINK_UP:
2760 trans_start = dev_trans_start(slave->dev);
2761 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2762 (!rtnl_dereference(bond->curr_active_slave) &&
2763 bond_time_in_interval(bond, trans_start, 1))) {
2764 struct slave *current_arp_slave;
2765
2766 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2767 bond_set_slave_link_state(slave, BOND_LINK_UP,
2768 BOND_SLAVE_NOTIFY_NOW);
2769 if (current_arp_slave) {
2770 bond_set_slave_inactive_flags(
2771 current_arp_slave,
2772 BOND_SLAVE_NOTIFY_NOW);
2773 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2774 }
2775
2776 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2777 slave->dev->name);
2778
2779 if (!rtnl_dereference(bond->curr_active_slave) ||
2780 slave == rtnl_dereference(bond->primary_slave))
2781 goto do_failover;
2782
2783 }
2784
2785 continue;
2786
2787 case BOND_LINK_DOWN:
2788 if (slave->link_failure_count < UINT_MAX)
2789 slave->link_failure_count++;
2790
2791 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2792 BOND_SLAVE_NOTIFY_NOW);
2793 bond_set_slave_inactive_flags(slave,
2794 BOND_SLAVE_NOTIFY_NOW);
2795
2796 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2797 slave->dev->name);
2798
2799 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2800 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2801 goto do_failover;
2802 }
2803
2804 continue;
2805
2806 default:
2807 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2808 slave->new_link, slave->dev->name);
2809 continue;
2810 }
2811
2812 do_failover:
2813 block_netpoll_tx();
2814 bond_select_active_slave(bond);
2815 unblock_netpoll_tx();
2816 }
2817
2818 bond_set_carrier(bond);
2819 }
2820
2821 /* Send ARP probes for active-backup mode ARP monitor.
2822 *
2823 * Called with rcu_read_lock held.
2824 */
2825 static bool bond_ab_arp_probe(struct bonding *bond)
2826 {
2827 struct slave *slave, *before = NULL, *new_slave = NULL,
2828 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2829 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2830 struct list_head *iter;
2831 bool found = false;
2832 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2833
2834 if (curr_arp_slave && curr_active_slave)
2835 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2836 curr_arp_slave->dev->name,
2837 curr_active_slave->dev->name);
2838
2839 if (curr_active_slave) {
2840 bond_arp_send_all(bond, curr_active_slave);
2841 return should_notify_rtnl;
2842 }
2843
2844 /* if we don't have a curr_active_slave, search for the next available
2845 * backup slave from the current_arp_slave and make it the candidate
2846 * for becoming the curr_active_slave
2847 */
2848
2849 if (!curr_arp_slave) {
2850 curr_arp_slave = bond_first_slave_rcu(bond);
2851 if (!curr_arp_slave)
2852 return should_notify_rtnl;
2853 }
2854
2855 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2856
2857 bond_for_each_slave_rcu(bond, slave, iter) {
2858 if (!found && !before && bond_slave_is_up(slave))
2859 before = slave;
2860
2861 if (found && !new_slave && bond_slave_is_up(slave))
2862 new_slave = slave;
2863 /* if the link state is up at this point, we
2864 * mark it down - this can happen if we have
2865 * simultaneous link failures and
2866 * reselect_active_interface doesn't make this
2867 * one the current slave so it is still marked
2868 * up when it is actually down
2869 */
2870 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2871 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2872 BOND_SLAVE_NOTIFY_LATER);
2873 if (slave->link_failure_count < UINT_MAX)
2874 slave->link_failure_count++;
2875
2876 bond_set_slave_inactive_flags(slave,
2877 BOND_SLAVE_NOTIFY_LATER);
2878
2879 netdev_info(bond->dev, "backup interface %s is now down\n",
2880 slave->dev->name);
2881 }
2882 if (slave == curr_arp_slave)
2883 found = true;
2884 }
2885
2886 if (!new_slave && before)
2887 new_slave = before;
2888
2889 if (!new_slave)
2890 goto check_state;
2891
2892 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2893 BOND_SLAVE_NOTIFY_LATER);
2894 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2895 bond_arp_send_all(bond, new_slave);
2896 new_slave->last_link_up = jiffies;
2897 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2898
2899 check_state:
2900 bond_for_each_slave_rcu(bond, slave, iter) {
2901 if (slave->should_notify || slave->should_notify_link) {
2902 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2903 break;
2904 }
2905 }
2906 return should_notify_rtnl;
2907 }
2908
2909 static void bond_activebackup_arp_mon(struct work_struct *work)
2910 {
2911 struct bonding *bond = container_of(work, struct bonding,
2912 arp_work.work);
2913 bool should_notify_peers = false;
2914 bool should_notify_rtnl = false;
2915 int delta_in_ticks;
2916
2917 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2918
2919 if (!bond_has_slaves(bond))
2920 goto re_arm;
2921
2922 rcu_read_lock();
2923
2924 should_notify_peers = bond_should_notify_peers(bond);
2925
2926 if (bond_ab_arp_inspect(bond)) {
2927 rcu_read_unlock();
2928
2929 /* Race avoidance with bond_close flush of workqueue */
2930 if (!rtnl_trylock()) {
2931 delta_in_ticks = 1;
2932 should_notify_peers = false;
2933 goto re_arm;
2934 }
2935
2936 bond_ab_arp_commit(bond);
2937
2938 rtnl_unlock();
2939 rcu_read_lock();
2940 }
2941
2942 should_notify_rtnl = bond_ab_arp_probe(bond);
2943 rcu_read_unlock();
2944
2945 re_arm:
2946 if (bond->params.arp_interval)
2947 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2948
2949 if (should_notify_peers || should_notify_rtnl) {
2950 if (!rtnl_trylock())
2951 return;
2952
2953 if (should_notify_peers)
2954 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2955 bond->dev);
2956 if (should_notify_rtnl) {
2957 bond_slave_state_notify(bond);
2958 bond_slave_link_notify(bond);
2959 }
2960
2961 rtnl_unlock();
2962 }
2963 }
2964
2965 /*-------------------------- netdev event handling --------------------------*/
2966
2967 /* Change device name */
2968 static int bond_event_changename(struct bonding *bond)
2969 {
2970 bond_remove_proc_entry(bond);
2971 bond_create_proc_entry(bond);
2972
2973 bond_debug_reregister(bond);
2974
2975 return NOTIFY_DONE;
2976 }
2977
2978 static int bond_master_netdev_event(unsigned long event,
2979 struct net_device *bond_dev)
2980 {
2981 struct bonding *event_bond = netdev_priv(bond_dev);
2982
2983 switch (event) {
2984 case NETDEV_CHANGENAME:
2985 return bond_event_changename(event_bond);
2986 case NETDEV_UNREGISTER:
2987 bond_remove_proc_entry(event_bond);
2988 break;
2989 case NETDEV_REGISTER:
2990 bond_create_proc_entry(event_bond);
2991 break;
2992 case NETDEV_NOTIFY_PEERS:
2993 if (event_bond->send_peer_notif)
2994 event_bond->send_peer_notif--;
2995 break;
2996 default:
2997 break;
2998 }
2999
3000 return NOTIFY_DONE;
3001 }
3002
3003 static int bond_slave_netdev_event(unsigned long event,
3004 struct net_device *slave_dev)
3005 {
3006 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3007 struct bonding *bond;
3008 struct net_device *bond_dev;
3009
3010 /* A netdev event can be generated while enslaving a device
3011 * before netdev_rx_handler_register is called in which case
3012 * slave will be NULL
3013 */
3014 if (!slave)
3015 return NOTIFY_DONE;
3016 bond_dev = slave->bond->dev;
3017 bond = slave->bond;
3018 primary = rtnl_dereference(bond->primary_slave);
3019
3020 switch (event) {
3021 case NETDEV_UNREGISTER:
3022 if (bond_dev->type != ARPHRD_ETHER)
3023 bond_release_and_destroy(bond_dev, slave_dev);
3024 else
3025 bond_release(bond_dev, slave_dev);
3026 break;
3027 case NETDEV_UP:
3028 case NETDEV_CHANGE:
3029 bond_update_speed_duplex(slave);
3030 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3031 bond_3ad_adapter_speed_duplex_changed(slave);
3032 /* Fallthrough */
3033 case NETDEV_DOWN:
3034 /* Refresh slave-array if applicable!
3035 * If the setup does not use miimon or arpmon (mode-specific!),
3036 * then these events will not cause the slave-array to be
3037 * refreshed. This will cause xmit to use a slave that is not
3038 * usable. Avoid such situation by refeshing the array at these
3039 * events. If these (miimon/arpmon) parameters are configured
3040 * then array gets refreshed twice and that should be fine!
3041 */
3042 if (bond_mode_uses_xmit_hash(bond))
3043 bond_update_slave_arr(bond, NULL);
3044 break;
3045 case NETDEV_CHANGEMTU:
3046 /* TODO: Should slaves be allowed to
3047 * independently alter their MTU? For
3048 * an active-backup bond, slaves need
3049 * not be the same type of device, so
3050 * MTUs may vary. For other modes,
3051 * slaves arguably should have the
3052 * same MTUs. To do this, we'd need to
3053 * take over the slave's change_mtu
3054 * function for the duration of their
3055 * servitude.
3056 */
3057 break;
3058 case NETDEV_CHANGENAME:
3059 /* we don't care if we don't have primary set */
3060 if (!bond_uses_primary(bond) ||
3061 !bond->params.primary[0])
3062 break;
3063
3064 if (slave == primary) {
3065 /* slave's name changed - he's no longer primary */
3066 RCU_INIT_POINTER(bond->primary_slave, NULL);
3067 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3068 /* we have a new primary slave */
3069 rcu_assign_pointer(bond->primary_slave, slave);
3070 } else { /* we didn't change primary - exit */
3071 break;
3072 }
3073
3074 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3075 primary ? slave_dev->name : "none");
3076
3077 block_netpoll_tx();
3078 bond_select_active_slave(bond);
3079 unblock_netpoll_tx();
3080 break;
3081 case NETDEV_FEAT_CHANGE:
3082 bond_compute_features(bond);
3083 break;
3084 case NETDEV_RESEND_IGMP:
3085 /* Propagate to master device */
3086 call_netdevice_notifiers(event, slave->bond->dev);
3087 break;
3088 default:
3089 break;
3090 }
3091
3092 return NOTIFY_DONE;
3093 }
3094
3095 /* bond_netdev_event: handle netdev notifier chain events.
3096 *
3097 * This function receives events for the netdev chain. The caller (an
3098 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3099 * locks for us to safely manipulate the slave devices (RTNL lock,
3100 * dev_probe_lock).
3101 */
3102 static int bond_netdev_event(struct notifier_block *this,
3103 unsigned long event, void *ptr)
3104 {
3105 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3106
3107 netdev_dbg(event_dev, "event: %lx\n", event);
3108
3109 if (!(event_dev->priv_flags & IFF_BONDING))
3110 return NOTIFY_DONE;
3111
3112 if (event_dev->flags & IFF_MASTER) {
3113 netdev_dbg(event_dev, "IFF_MASTER\n");
3114 return bond_master_netdev_event(event, event_dev);
3115 }
3116
3117 if (event_dev->flags & IFF_SLAVE) {
3118 netdev_dbg(event_dev, "IFF_SLAVE\n");
3119 return bond_slave_netdev_event(event, event_dev);
3120 }
3121
3122 return NOTIFY_DONE;
3123 }
3124
3125 static struct notifier_block bond_netdev_notifier = {
3126 .notifier_call = bond_netdev_event,
3127 };
3128
3129 /*---------------------------- Hashing Policies -----------------------------*/
3130
3131 /* L2 hash helper */
3132 static inline u32 bond_eth_hash(struct sk_buff *skb)
3133 {
3134 struct ethhdr *ep, hdr_tmp;
3135
3136 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3137 if (ep)
3138 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3139 return 0;
3140 }
3141
3142 /* Extract the appropriate headers based on bond's xmit policy */
3143 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3144 struct flow_keys *fk)
3145 {
3146 const struct ipv6hdr *iph6;
3147 const struct iphdr *iph;
3148 int noff, proto = -1;
3149
3150 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3151 return skb_flow_dissect_flow_keys(skb, fk, 0);
3152
3153 fk->ports.ports = 0;
3154 noff = skb_network_offset(skb);
3155 if (skb->protocol == htons(ETH_P_IP)) {
3156 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3157 return false;
3158 iph = ip_hdr(skb);
3159 iph_to_flow_copy_v4addrs(fk, iph);
3160 noff += iph->ihl << 2;
3161 if (!ip_is_fragment(iph))
3162 proto = iph->protocol;
3163 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3164 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3165 return false;
3166 iph6 = ipv6_hdr(skb);
3167 iph_to_flow_copy_v6addrs(fk, iph6);
3168 noff += sizeof(*iph6);
3169 proto = iph6->nexthdr;
3170 } else {
3171 return false;
3172 }
3173 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3174 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3175
3176 return true;
3177 }
3178
3179 /**
3180 * bond_xmit_hash - generate a hash value based on the xmit policy
3181 * @bond: bonding device
3182 * @skb: buffer to use for headers
3183 *
3184 * This function will extract the necessary headers from the skb buffer and use
3185 * them to generate a hash based on the xmit_policy set in the bonding device
3186 */
3187 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3188 {
3189 struct flow_keys flow;
3190 u32 hash;
3191
3192 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3193 skb->l4_hash)
3194 return skb->hash;
3195
3196 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3197 !bond_flow_dissect(bond, skb, &flow))
3198 return bond_eth_hash(skb);
3199
3200 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3201 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3202 hash = bond_eth_hash(skb);
3203 else
3204 hash = (__force u32)flow.ports.ports;
3205 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3206 (__force u32)flow_get_u32_src(&flow);
3207 hash ^= (hash >> 16);
3208 hash ^= (hash >> 8);
3209
3210 return hash;
3211 }
3212
3213 /*-------------------------- Device entry points ----------------------------*/
3214
3215 static void bond_work_init_all(struct bonding *bond)
3216 {
3217 INIT_DELAYED_WORK(&bond->mcast_work,
3218 bond_resend_igmp_join_requests_delayed);
3219 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3220 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3221 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3222 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3223 else
3224 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3225 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3226 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3227 }
3228
3229 static void bond_work_cancel_all(struct bonding *bond)
3230 {
3231 cancel_delayed_work_sync(&bond->mii_work);
3232 cancel_delayed_work_sync(&bond->arp_work);
3233 cancel_delayed_work_sync(&bond->alb_work);
3234 cancel_delayed_work_sync(&bond->ad_work);
3235 cancel_delayed_work_sync(&bond->mcast_work);
3236 cancel_delayed_work_sync(&bond->slave_arr_work);
3237 }
3238
3239 static int bond_open(struct net_device *bond_dev)
3240 {
3241 struct bonding *bond = netdev_priv(bond_dev);
3242 struct list_head *iter;
3243 struct slave *slave;
3244
3245 /* reset slave->backup and slave->inactive */
3246 if (bond_has_slaves(bond)) {
3247 bond_for_each_slave(bond, slave, iter) {
3248 if (bond_uses_primary(bond) &&
3249 slave != rcu_access_pointer(bond->curr_active_slave)) {
3250 bond_set_slave_inactive_flags(slave,
3251 BOND_SLAVE_NOTIFY_NOW);
3252 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3253 bond_set_slave_active_flags(slave,
3254 BOND_SLAVE_NOTIFY_NOW);
3255 }
3256 }
3257 }
3258
3259 bond_work_init_all(bond);
3260
3261 if (bond_is_lb(bond)) {
3262 /* bond_alb_initialize must be called before the timer
3263 * is started.
3264 */
3265 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3266 return -ENOMEM;
3267 if (bond->params.tlb_dynamic_lb)
3268 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3269 }
3270
3271 if (bond->params.miimon) /* link check interval, in milliseconds. */
3272 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3273
3274 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3275 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3276 bond->recv_probe = bond_arp_rcv;
3277 }
3278
3279 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3280 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3281 /* register to receive LACPDUs */
3282 bond->recv_probe = bond_3ad_lacpdu_recv;
3283 bond_3ad_initiate_agg_selection(bond, 1);
3284 }
3285
3286 if (bond_mode_uses_xmit_hash(bond))
3287 bond_update_slave_arr(bond, NULL);
3288
3289 return 0;
3290 }
3291
3292 static int bond_close(struct net_device *bond_dev)
3293 {
3294 struct bonding *bond = netdev_priv(bond_dev);
3295
3296 bond_work_cancel_all(bond);
3297 bond->send_peer_notif = 0;
3298 if (bond_is_lb(bond))
3299 bond_alb_deinitialize(bond);
3300 bond->recv_probe = NULL;
3301
3302 return 0;
3303 }
3304
3305 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3306 * that some drivers can provide 32bit values only.
3307 */
3308 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3309 const struct rtnl_link_stats64 *_new,
3310 const struct rtnl_link_stats64 *_old)
3311 {
3312 const u64 *new = (const u64 *)_new;
3313 const u64 *old = (const u64 *)_old;
3314 u64 *res = (u64 *)_res;
3315 int i;
3316
3317 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3318 u64 nv = new[i];
3319 u64 ov = old[i];
3320
3321 /* detects if this particular field is 32bit only */
3322 if (((nv | ov) >> 32) == 0)
3323 res[i] += (u32)nv - (u32)ov;
3324 else
3325 res[i] += nv - ov;
3326 }
3327 }
3328
3329 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3330 struct rtnl_link_stats64 *stats)
3331 {
3332 struct bonding *bond = netdev_priv(bond_dev);
3333 struct rtnl_link_stats64 temp;
3334 struct list_head *iter;
3335 struct slave *slave;
3336
3337 spin_lock(&bond->stats_lock);
3338 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3339
3340 rcu_read_lock();
3341 bond_for_each_slave_rcu(bond, slave, iter) {
3342 const struct rtnl_link_stats64 *new =
3343 dev_get_stats(slave->dev, &temp);
3344
3345 bond_fold_stats(stats, new, &slave->slave_stats);
3346
3347 /* save off the slave stats for the next run */
3348 memcpy(&slave->slave_stats, new, sizeof(*new));
3349 }
3350 rcu_read_unlock();
3351
3352 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3353 spin_unlock(&bond->stats_lock);
3354
3355 return stats;
3356 }
3357
3358 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3359 {
3360 struct bonding *bond = netdev_priv(bond_dev);
3361 struct net_device *slave_dev = NULL;
3362 struct ifbond k_binfo;
3363 struct ifbond __user *u_binfo = NULL;
3364 struct ifslave k_sinfo;
3365 struct ifslave __user *u_sinfo = NULL;
3366 struct mii_ioctl_data *mii = NULL;
3367 struct bond_opt_value newval;
3368 struct net *net;
3369 int res = 0;
3370
3371 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3372
3373 switch (cmd) {
3374 case SIOCGMIIPHY:
3375 mii = if_mii(ifr);
3376 if (!mii)
3377 return -EINVAL;
3378
3379 mii->phy_id = 0;
3380 /* Fall Through */
3381 case SIOCGMIIREG:
3382 /* We do this again just in case we were called by SIOCGMIIREG
3383 * instead of SIOCGMIIPHY.
3384 */
3385 mii = if_mii(ifr);
3386 if (!mii)
3387 return -EINVAL;
3388
3389 if (mii->reg_num == 1) {
3390 mii->val_out = 0;
3391 if (netif_carrier_ok(bond->dev))
3392 mii->val_out = BMSR_LSTATUS;
3393 }
3394
3395 return 0;
3396 case BOND_INFO_QUERY_OLD:
3397 case SIOCBONDINFOQUERY:
3398 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3399
3400 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3401 return -EFAULT;
3402
3403 res = bond_info_query(bond_dev, &k_binfo);
3404 if (res == 0 &&
3405 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3406 return -EFAULT;
3407
3408 return res;
3409 case BOND_SLAVE_INFO_QUERY_OLD:
3410 case SIOCBONDSLAVEINFOQUERY:
3411 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3412
3413 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3414 return -EFAULT;
3415
3416 res = bond_slave_info_query(bond_dev, &k_sinfo);
3417 if (res == 0 &&
3418 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3419 return -EFAULT;
3420
3421 return res;
3422 default:
3423 break;
3424 }
3425
3426 net = dev_net(bond_dev);
3427
3428 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3429 return -EPERM;
3430
3431 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3432
3433 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3434
3435 if (!slave_dev)
3436 return -ENODEV;
3437
3438 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3439 switch (cmd) {
3440 case BOND_ENSLAVE_OLD:
3441 case SIOCBONDENSLAVE:
3442 res = bond_enslave(bond_dev, slave_dev);
3443 break;
3444 case BOND_RELEASE_OLD:
3445 case SIOCBONDRELEASE:
3446 res = bond_release(bond_dev, slave_dev);
3447 break;
3448 case BOND_SETHWADDR_OLD:
3449 case SIOCBONDSETHWADDR:
3450 bond_set_dev_addr(bond_dev, slave_dev);
3451 res = 0;
3452 break;
3453 case BOND_CHANGE_ACTIVE_OLD:
3454 case SIOCBONDCHANGEACTIVE:
3455 bond_opt_initstr(&newval, slave_dev->name);
3456 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3457 break;
3458 default:
3459 res = -EOPNOTSUPP;
3460 }
3461
3462 return res;
3463 }
3464
3465 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3466 {
3467 struct bonding *bond = netdev_priv(bond_dev);
3468
3469 if (change & IFF_PROMISC)
3470 bond_set_promiscuity(bond,
3471 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3472
3473 if (change & IFF_ALLMULTI)
3474 bond_set_allmulti(bond,
3475 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3476 }
3477
3478 static void bond_set_rx_mode(struct net_device *bond_dev)
3479 {
3480 struct bonding *bond = netdev_priv(bond_dev);
3481 struct list_head *iter;
3482 struct slave *slave;
3483
3484 rcu_read_lock();
3485 if (bond_uses_primary(bond)) {
3486 slave = rcu_dereference(bond->curr_active_slave);
3487 if (slave) {
3488 dev_uc_sync(slave->dev, bond_dev);
3489 dev_mc_sync(slave->dev, bond_dev);
3490 }
3491 } else {
3492 bond_for_each_slave_rcu(bond, slave, iter) {
3493 dev_uc_sync_multiple(slave->dev, bond_dev);
3494 dev_mc_sync_multiple(slave->dev, bond_dev);
3495 }
3496 }
3497 rcu_read_unlock();
3498 }
3499
3500 static int bond_neigh_init(struct neighbour *n)
3501 {
3502 struct bonding *bond = netdev_priv(n->dev);
3503 const struct net_device_ops *slave_ops;
3504 struct neigh_parms parms;
3505 struct slave *slave;
3506 int ret;
3507
3508 slave = bond_first_slave(bond);
3509 if (!slave)
3510 return 0;
3511 slave_ops = slave->dev->netdev_ops;
3512 if (!slave_ops->ndo_neigh_setup)
3513 return 0;
3514
3515 parms.neigh_setup = NULL;
3516 parms.neigh_cleanup = NULL;
3517 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3518 if (ret)
3519 return ret;
3520
3521 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3522 * after the last slave has been detached. Assumes that all slaves
3523 * utilize the same neigh_cleanup (true at this writing as only user
3524 * is ipoib).
3525 */
3526 n->parms->neigh_cleanup = parms.neigh_cleanup;
3527
3528 if (!parms.neigh_setup)
3529 return 0;
3530
3531 return parms.neigh_setup(n);
3532 }
3533
3534 /* The bonding ndo_neigh_setup is called at init time beofre any
3535 * slave exists. So we must declare proxy setup function which will
3536 * be used at run time to resolve the actual slave neigh param setup.
3537 *
3538 * It's also called by master devices (such as vlans) to setup their
3539 * underlying devices. In that case - do nothing, we're already set up from
3540 * our init.
3541 */
3542 static int bond_neigh_setup(struct net_device *dev,
3543 struct neigh_parms *parms)
3544 {
3545 /* modify only our neigh_parms */
3546 if (parms->dev == dev)
3547 parms->neigh_setup = bond_neigh_init;
3548
3549 return 0;
3550 }
3551
3552 /* Change the MTU of all of a master's slaves to match the master */
3553 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3554 {
3555 struct bonding *bond = netdev_priv(bond_dev);
3556 struct slave *slave, *rollback_slave;
3557 struct list_head *iter;
3558 int res = 0;
3559
3560 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3561
3562 bond_for_each_slave(bond, slave, iter) {
3563 netdev_dbg(bond_dev, "s %p c_m %p\n",
3564 slave, slave->dev->netdev_ops->ndo_change_mtu);
3565
3566 res = dev_set_mtu(slave->dev, new_mtu);
3567
3568 if (res) {
3569 /* If we failed to set the slave's mtu to the new value
3570 * we must abort the operation even in ACTIVE_BACKUP
3571 * mode, because if we allow the backup slaves to have
3572 * different mtu values than the active slave we'll
3573 * need to change their mtu when doing a failover. That
3574 * means changing their mtu from timer context, which
3575 * is probably not a good idea.
3576 */
3577 netdev_dbg(bond_dev, "err %d %s\n", res,
3578 slave->dev->name);
3579 goto unwind;
3580 }
3581 }
3582
3583 bond_dev->mtu = new_mtu;
3584
3585 return 0;
3586
3587 unwind:
3588 /* unwind from head to the slave that failed */
3589 bond_for_each_slave(bond, rollback_slave, iter) {
3590 int tmp_res;
3591
3592 if (rollback_slave == slave)
3593 break;
3594
3595 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3596 if (tmp_res) {
3597 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3598 tmp_res, rollback_slave->dev->name);
3599 }
3600 }
3601
3602 return res;
3603 }
3604
3605 /* Change HW address
3606 *
3607 * Note that many devices must be down to change the HW address, and
3608 * downing the master releases all slaves. We can make bonds full of
3609 * bonding devices to test this, however.
3610 */
3611 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3612 {
3613 struct bonding *bond = netdev_priv(bond_dev);
3614 struct slave *slave, *rollback_slave;
3615 struct sockaddr *sa = addr, tmp_sa;
3616 struct list_head *iter;
3617 int res = 0;
3618
3619 if (BOND_MODE(bond) == BOND_MODE_ALB)
3620 return bond_alb_set_mac_address(bond_dev, addr);
3621
3622
3623 netdev_dbg(bond_dev, "bond=%p\n", bond);
3624
3625 /* If fail_over_mac is enabled, do nothing and return success.
3626 * Returning an error causes ifenslave to fail.
3627 */
3628 if (bond->params.fail_over_mac &&
3629 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3630 return 0;
3631
3632 if (!is_valid_ether_addr(sa->sa_data))
3633 return -EADDRNOTAVAIL;
3634
3635 bond_for_each_slave(bond, slave, iter) {
3636 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3637 res = dev_set_mac_address(slave->dev, addr);
3638 if (res) {
3639 /* TODO: consider downing the slave
3640 * and retry ?
3641 * User should expect communications
3642 * breakage anyway until ARP finish
3643 * updating, so...
3644 */
3645 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3646 goto unwind;
3647 }
3648 }
3649
3650 /* success */
3651 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3652 return 0;
3653
3654 unwind:
3655 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3656 tmp_sa.sa_family = bond_dev->type;
3657
3658 /* unwind from head to the slave that failed */
3659 bond_for_each_slave(bond, rollback_slave, iter) {
3660 int tmp_res;
3661
3662 if (rollback_slave == slave)
3663 break;
3664
3665 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3666 if (tmp_res) {
3667 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3668 tmp_res, rollback_slave->dev->name);
3669 }
3670 }
3671
3672 return res;
3673 }
3674
3675 /**
3676 * bond_xmit_slave_id - transmit skb through slave with slave_id
3677 * @bond: bonding device that is transmitting
3678 * @skb: buffer to transmit
3679 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3680 *
3681 * This function tries to transmit through slave with slave_id but in case
3682 * it fails, it tries to find the first available slave for transmission.
3683 * The skb is consumed in all cases, thus the function is void.
3684 */
3685 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3686 {
3687 struct list_head *iter;
3688 struct slave *slave;
3689 int i = slave_id;
3690
3691 /* Here we start from the slave with slave_id */
3692 bond_for_each_slave_rcu(bond, slave, iter) {
3693 if (--i < 0) {
3694 if (bond_slave_can_tx(slave)) {
3695 bond_dev_queue_xmit(bond, skb, slave->dev);
3696 return;
3697 }
3698 }
3699 }
3700
3701 /* Here we start from the first slave up to slave_id */
3702 i = slave_id;
3703 bond_for_each_slave_rcu(bond, slave, iter) {
3704 if (--i < 0)
3705 break;
3706 if (bond_slave_can_tx(slave)) {
3707 bond_dev_queue_xmit(bond, skb, slave->dev);
3708 return;
3709 }
3710 }
3711 /* no slave that can tx has been found */
3712 bond_tx_drop(bond->dev, skb);
3713 }
3714
3715 /**
3716 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3717 * @bond: bonding device to use
3718 *
3719 * Based on the value of the bonding device's packets_per_slave parameter
3720 * this function generates a slave id, which is usually used as the next
3721 * slave to transmit through.
3722 */
3723 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3724 {
3725 u32 slave_id;
3726 struct reciprocal_value reciprocal_packets_per_slave;
3727 int packets_per_slave = bond->params.packets_per_slave;
3728
3729 switch (packets_per_slave) {
3730 case 0:
3731 slave_id = prandom_u32();
3732 break;
3733 case 1:
3734 slave_id = bond->rr_tx_counter;
3735 break;
3736 default:
3737 reciprocal_packets_per_slave =
3738 bond->params.reciprocal_packets_per_slave;
3739 slave_id = reciprocal_divide(bond->rr_tx_counter,
3740 reciprocal_packets_per_slave);
3741 break;
3742 }
3743 bond->rr_tx_counter++;
3744
3745 return slave_id;
3746 }
3747
3748 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3749 {
3750 struct bonding *bond = netdev_priv(bond_dev);
3751 struct iphdr *iph = ip_hdr(skb);
3752 struct slave *slave;
3753 u32 slave_id;
3754
3755 /* Start with the curr_active_slave that joined the bond as the
3756 * default for sending IGMP traffic. For failover purposes one
3757 * needs to maintain some consistency for the interface that will
3758 * send the join/membership reports. The curr_active_slave found
3759 * will send all of this type of traffic.
3760 */
3761 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3762 slave = rcu_dereference(bond->curr_active_slave);
3763 if (slave)
3764 bond_dev_queue_xmit(bond, skb, slave->dev);
3765 else
3766 bond_xmit_slave_id(bond, skb, 0);
3767 } else {
3768 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3769
3770 if (likely(slave_cnt)) {
3771 slave_id = bond_rr_gen_slave_id(bond);
3772 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3773 } else {
3774 bond_tx_drop(bond_dev, skb);
3775 }
3776 }
3777
3778 return NETDEV_TX_OK;
3779 }
3780
3781 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3782 * the bond has a usable interface.
3783 */
3784 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3785 {
3786 struct bonding *bond = netdev_priv(bond_dev);
3787 struct slave *slave;
3788
3789 slave = rcu_dereference(bond->curr_active_slave);
3790 if (slave)
3791 bond_dev_queue_xmit(bond, skb, slave->dev);
3792 else
3793 bond_tx_drop(bond_dev, skb);
3794
3795 return NETDEV_TX_OK;
3796 }
3797
3798 /* Use this to update slave_array when (a) it's not appropriate to update
3799 * slave_array right away (note that update_slave_array() may sleep)
3800 * and / or (b) RTNL is not held.
3801 */
3802 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3803 {
3804 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3805 }
3806
3807 /* Slave array work handler. Holds only RTNL */
3808 static void bond_slave_arr_handler(struct work_struct *work)
3809 {
3810 struct bonding *bond = container_of(work, struct bonding,
3811 slave_arr_work.work);
3812 int ret;
3813
3814 if (!rtnl_trylock())
3815 goto err;
3816
3817 ret = bond_update_slave_arr(bond, NULL);
3818 rtnl_unlock();
3819 if (ret) {
3820 pr_warn_ratelimited("Failed to update slave array from WT\n");
3821 goto err;
3822 }
3823 return;
3824
3825 err:
3826 bond_slave_arr_work_rearm(bond, 1);
3827 }
3828
3829 /* Build the usable slaves array in control path for modes that use xmit-hash
3830 * to determine the slave interface -
3831 * (a) BOND_MODE_8023AD
3832 * (b) BOND_MODE_XOR
3833 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3834 *
3835 * The caller is expected to hold RTNL only and NO other lock!
3836 */
3837 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3838 {
3839 struct slave *slave;
3840 struct list_head *iter;
3841 struct bond_up_slave *new_arr, *old_arr;
3842 int agg_id = 0;
3843 int ret = 0;
3844
3845 #ifdef CONFIG_LOCKDEP
3846 WARN_ON(lockdep_is_held(&bond->mode_lock));
3847 #endif
3848
3849 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3850 GFP_KERNEL);
3851 if (!new_arr) {
3852 ret = -ENOMEM;
3853 pr_err("Failed to build slave-array.\n");
3854 goto out;
3855 }
3856 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3857 struct ad_info ad_info;
3858
3859 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3860 pr_debug("bond_3ad_get_active_agg_info failed\n");
3861 kfree_rcu(new_arr, rcu);
3862 /* No active aggragator means it's not safe to use
3863 * the previous array.
3864 */
3865 old_arr = rtnl_dereference(bond->slave_arr);
3866 if (old_arr) {
3867 RCU_INIT_POINTER(bond->slave_arr, NULL);
3868 kfree_rcu(old_arr, rcu);
3869 }
3870 goto out;
3871 }
3872 agg_id = ad_info.aggregator_id;
3873 }
3874 bond_for_each_slave(bond, slave, iter) {
3875 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3876 struct aggregator *agg;
3877
3878 agg = SLAVE_AD_INFO(slave)->port.aggregator;
3879 if (!agg || agg->aggregator_identifier != agg_id)
3880 continue;
3881 }
3882 if (!bond_slave_can_tx(slave))
3883 continue;
3884 if (skipslave == slave)
3885 continue;
3886 new_arr->arr[new_arr->count++] = slave;
3887 }
3888
3889 old_arr = rtnl_dereference(bond->slave_arr);
3890 rcu_assign_pointer(bond->slave_arr, new_arr);
3891 if (old_arr)
3892 kfree_rcu(old_arr, rcu);
3893 out:
3894 if (ret != 0 && skipslave) {
3895 int idx;
3896
3897 /* Rare situation where caller has asked to skip a specific
3898 * slave but allocation failed (most likely!). BTW this is
3899 * only possible when the call is initiated from
3900 * __bond_release_one(). In this situation; overwrite the
3901 * skipslave entry in the array with the last entry from the
3902 * array to avoid a situation where the xmit path may choose
3903 * this to-be-skipped slave to send a packet out.
3904 */
3905 old_arr = rtnl_dereference(bond->slave_arr);
3906 for (idx = 0; idx < old_arr->count; idx++) {
3907 if (skipslave == old_arr->arr[idx]) {
3908 old_arr->arr[idx] =
3909 old_arr->arr[old_arr->count-1];
3910 old_arr->count--;
3911 break;
3912 }
3913 }
3914 }
3915 return ret;
3916 }
3917
3918 /* Use this Xmit function for 3AD as well as XOR modes. The current
3919 * usable slave array is formed in the control path. The xmit function
3920 * just calculates hash and sends the packet out.
3921 */
3922 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3923 {
3924 struct bonding *bond = netdev_priv(dev);
3925 struct slave *slave;
3926 struct bond_up_slave *slaves;
3927 unsigned int count;
3928
3929 slaves = rcu_dereference(bond->slave_arr);
3930 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3931 if (likely(count)) {
3932 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3933 bond_dev_queue_xmit(bond, skb, slave->dev);
3934 } else {
3935 bond_tx_drop(dev, skb);
3936 }
3937
3938 return NETDEV_TX_OK;
3939 }
3940
3941 /* in broadcast mode, we send everything to all usable interfaces. */
3942 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3943 {
3944 struct bonding *bond = netdev_priv(bond_dev);
3945 struct slave *slave = NULL;
3946 struct list_head *iter;
3947
3948 bond_for_each_slave_rcu(bond, slave, iter) {
3949 if (bond_is_last_slave(bond, slave))
3950 break;
3951 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3952 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3953
3954 if (!skb2) {
3955 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3956 bond_dev->name, __func__);
3957 continue;
3958 }
3959 bond_dev_queue_xmit(bond, skb2, slave->dev);
3960 }
3961 }
3962 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3963 bond_dev_queue_xmit(bond, skb, slave->dev);
3964 else
3965 bond_tx_drop(bond_dev, skb);
3966
3967 return NETDEV_TX_OK;
3968 }
3969
3970 /*------------------------- Device initialization ---------------------------*/
3971
3972 /* Lookup the slave that corresponds to a qid */
3973 static inline int bond_slave_override(struct bonding *bond,
3974 struct sk_buff *skb)
3975 {
3976 struct slave *slave = NULL;
3977 struct list_head *iter;
3978
3979 if (!skb->queue_mapping)
3980 return 1;
3981
3982 /* Find out if any slaves have the same mapping as this skb. */
3983 bond_for_each_slave_rcu(bond, slave, iter) {
3984 if (slave->queue_id == skb->queue_mapping) {
3985 if (bond_slave_is_up(slave) &&
3986 slave->link == BOND_LINK_UP) {
3987 bond_dev_queue_xmit(bond, skb, slave->dev);
3988 return 0;
3989 }
3990 /* If the slave isn't UP, use default transmit policy. */
3991 break;
3992 }
3993 }
3994
3995 return 1;
3996 }
3997
3998
3999 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4000 void *accel_priv, select_queue_fallback_t fallback)
4001 {
4002 /* This helper function exists to help dev_pick_tx get the correct
4003 * destination queue. Using a helper function skips a call to
4004 * skb_tx_hash and will put the skbs in the queue we expect on their
4005 * way down to the bonding driver.
4006 */
4007 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4008
4009 /* Save the original txq to restore before passing to the driver */
4010 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4011
4012 if (unlikely(txq >= dev->real_num_tx_queues)) {
4013 do {
4014 txq -= dev->real_num_tx_queues;
4015 } while (txq >= dev->real_num_tx_queues);
4016 }
4017 return txq;
4018 }
4019
4020 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4021 {
4022 struct bonding *bond = netdev_priv(dev);
4023
4024 if (bond_should_override_tx_queue(bond) &&
4025 !bond_slave_override(bond, skb))
4026 return NETDEV_TX_OK;
4027
4028 switch (BOND_MODE(bond)) {
4029 case BOND_MODE_ROUNDROBIN:
4030 return bond_xmit_roundrobin(skb, dev);
4031 case BOND_MODE_ACTIVEBACKUP:
4032 return bond_xmit_activebackup(skb, dev);
4033 case BOND_MODE_8023AD:
4034 case BOND_MODE_XOR:
4035 return bond_3ad_xor_xmit(skb, dev);
4036 case BOND_MODE_BROADCAST:
4037 return bond_xmit_broadcast(skb, dev);
4038 case BOND_MODE_ALB:
4039 return bond_alb_xmit(skb, dev);
4040 case BOND_MODE_TLB:
4041 return bond_tlb_xmit(skb, dev);
4042 default:
4043 /* Should never happen, mode already checked */
4044 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4045 WARN_ON_ONCE(1);
4046 bond_tx_drop(dev, skb);
4047 return NETDEV_TX_OK;
4048 }
4049 }
4050
4051 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4052 {
4053 struct bonding *bond = netdev_priv(dev);
4054 netdev_tx_t ret = NETDEV_TX_OK;
4055
4056 /* If we risk deadlock from transmitting this in the
4057 * netpoll path, tell netpoll to queue the frame for later tx
4058 */
4059 if (unlikely(is_netpoll_tx_blocked(dev)))
4060 return NETDEV_TX_BUSY;
4061
4062 rcu_read_lock();
4063 if (bond_has_slaves(bond))
4064 ret = __bond_start_xmit(skb, dev);
4065 else
4066 bond_tx_drop(dev, skb);
4067 rcu_read_unlock();
4068
4069 return ret;
4070 }
4071
4072 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4073 struct ethtool_cmd *ecmd)
4074 {
4075 struct bonding *bond = netdev_priv(bond_dev);
4076 unsigned long speed = 0;
4077 struct list_head *iter;
4078 struct slave *slave;
4079
4080 ecmd->duplex = DUPLEX_UNKNOWN;
4081 ecmd->port = PORT_OTHER;
4082
4083 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4084 * do not need to check mode. Though link speed might not represent
4085 * the true receive or transmit bandwidth (not all modes are symmetric)
4086 * this is an accurate maximum.
4087 */
4088 bond_for_each_slave(bond, slave, iter) {
4089 if (bond_slave_can_tx(slave)) {
4090 if (slave->speed != SPEED_UNKNOWN)
4091 speed += slave->speed;
4092 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4093 slave->duplex != DUPLEX_UNKNOWN)
4094 ecmd->duplex = slave->duplex;
4095 }
4096 }
4097 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4098
4099 return 0;
4100 }
4101
4102 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4103 struct ethtool_drvinfo *drvinfo)
4104 {
4105 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4106 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4107 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4108 BOND_ABI_VERSION);
4109 }
4110
4111 static const struct ethtool_ops bond_ethtool_ops = {
4112 .get_drvinfo = bond_ethtool_get_drvinfo,
4113 .get_settings = bond_ethtool_get_settings,
4114 .get_link = ethtool_op_get_link,
4115 };
4116
4117 static const struct net_device_ops bond_netdev_ops = {
4118 .ndo_init = bond_init,
4119 .ndo_uninit = bond_uninit,
4120 .ndo_open = bond_open,
4121 .ndo_stop = bond_close,
4122 .ndo_start_xmit = bond_start_xmit,
4123 .ndo_select_queue = bond_select_queue,
4124 .ndo_get_stats64 = bond_get_stats,
4125 .ndo_do_ioctl = bond_do_ioctl,
4126 .ndo_change_rx_flags = bond_change_rx_flags,
4127 .ndo_set_rx_mode = bond_set_rx_mode,
4128 .ndo_change_mtu = bond_change_mtu,
4129 .ndo_set_mac_address = bond_set_mac_address,
4130 .ndo_neigh_setup = bond_neigh_setup,
4131 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4132 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4133 #ifdef CONFIG_NET_POLL_CONTROLLER
4134 .ndo_netpoll_setup = bond_netpoll_setup,
4135 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4136 .ndo_poll_controller = bond_poll_controller,
4137 #endif
4138 .ndo_add_slave = bond_enslave,
4139 .ndo_del_slave = bond_release,
4140 .ndo_fix_features = bond_fix_features,
4141 .ndo_bridge_setlink = switchdev_port_bridge_setlink,
4142 .ndo_bridge_getlink = switchdev_port_bridge_getlink,
4143 .ndo_bridge_dellink = switchdev_port_bridge_dellink,
4144 .ndo_fdb_add = switchdev_port_fdb_add,
4145 .ndo_fdb_del = switchdev_port_fdb_del,
4146 .ndo_fdb_dump = switchdev_port_fdb_dump,
4147 .ndo_features_check = passthru_features_check,
4148 };
4149
4150 static const struct device_type bond_type = {
4151 .name = "bond",
4152 };
4153
4154 static void bond_destructor(struct net_device *bond_dev)
4155 {
4156 struct bonding *bond = netdev_priv(bond_dev);
4157 if (bond->wq)
4158 destroy_workqueue(bond->wq);
4159 free_netdev(bond_dev);
4160 }
4161
4162 void bond_setup(struct net_device *bond_dev)
4163 {
4164 struct bonding *bond = netdev_priv(bond_dev);
4165
4166 spin_lock_init(&bond->mode_lock);
4167 spin_lock_init(&bond->stats_lock);
4168 bond->params = bonding_defaults;
4169
4170 /* Initialize pointers */
4171 bond->dev = bond_dev;
4172
4173 /* Initialize the device entry points */
4174 ether_setup(bond_dev);
4175 bond_dev->netdev_ops = &bond_netdev_ops;
4176 bond_dev->ethtool_ops = &bond_ethtool_ops;
4177
4178 bond_dev->destructor = bond_destructor;
4179
4180 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4181
4182 /* Initialize the device options */
4183 bond_dev->flags |= IFF_MASTER;
4184 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4185 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4186
4187 /* don't acquire bond device's netif_tx_lock when transmitting */
4188 bond_dev->features |= NETIF_F_LLTX;
4189
4190 /* By default, we declare the bond to be fully
4191 * VLAN hardware accelerated capable. Special
4192 * care is taken in the various xmit functions
4193 * when there are slaves that are not hw accel
4194 * capable
4195 */
4196
4197 /* Don't allow bond devices to change network namespaces. */
4198 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4199
4200 bond_dev->hw_features = BOND_VLAN_FEATURES |
4201 NETIF_F_HW_VLAN_CTAG_TX |
4202 NETIF_F_HW_VLAN_CTAG_RX |
4203 NETIF_F_HW_VLAN_CTAG_FILTER;
4204
4205 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4206 bond_dev->features |= bond_dev->hw_features;
4207 }
4208
4209 /* Destroy a bonding device.
4210 * Must be under rtnl_lock when this function is called.
4211 */
4212 static void bond_uninit(struct net_device *bond_dev)
4213 {
4214 struct bonding *bond = netdev_priv(bond_dev);
4215 struct list_head *iter;
4216 struct slave *slave;
4217 struct bond_up_slave *arr;
4218
4219 bond_netpoll_cleanup(bond_dev);
4220
4221 /* Release the bonded slaves */
4222 bond_for_each_slave(bond, slave, iter)
4223 __bond_release_one(bond_dev, slave->dev, true);
4224 netdev_info(bond_dev, "Released all slaves\n");
4225
4226 arr = rtnl_dereference(bond->slave_arr);
4227 if (arr) {
4228 RCU_INIT_POINTER(bond->slave_arr, NULL);
4229 kfree_rcu(arr, rcu);
4230 }
4231
4232 list_del(&bond->bond_list);
4233
4234 bond_debug_unregister(bond);
4235 }
4236
4237 /*------------------------- Module initialization ---------------------------*/
4238
4239 static int bond_check_params(struct bond_params *params)
4240 {
4241 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4242 struct bond_opt_value newval;
4243 const struct bond_opt_value *valptr;
4244 int arp_all_targets_value;
4245 u16 ad_actor_sys_prio = 0;
4246 u16 ad_user_port_key = 0;
4247
4248 /* Convert string parameters. */
4249 if (mode) {
4250 bond_opt_initstr(&newval, mode);
4251 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4252 if (!valptr) {
4253 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4254 return -EINVAL;
4255 }
4256 bond_mode = valptr->value;
4257 }
4258
4259 if (xmit_hash_policy) {
4260 if ((bond_mode != BOND_MODE_XOR) &&
4261 (bond_mode != BOND_MODE_8023AD) &&
4262 (bond_mode != BOND_MODE_TLB)) {
4263 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4264 bond_mode_name(bond_mode));
4265 } else {
4266 bond_opt_initstr(&newval, xmit_hash_policy);
4267 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4268 &newval);
4269 if (!valptr) {
4270 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4271 xmit_hash_policy);
4272 return -EINVAL;
4273 }
4274 xmit_hashtype = valptr->value;
4275 }
4276 }
4277
4278 if (lacp_rate) {
4279 if (bond_mode != BOND_MODE_8023AD) {
4280 pr_info("lacp_rate param is irrelevant in mode %s\n",
4281 bond_mode_name(bond_mode));
4282 } else {
4283 bond_opt_initstr(&newval, lacp_rate);
4284 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4285 &newval);
4286 if (!valptr) {
4287 pr_err("Error: Invalid lacp rate \"%s\"\n",
4288 lacp_rate);
4289 return -EINVAL;
4290 }
4291 lacp_fast = valptr->value;
4292 }
4293 }
4294
4295 if (ad_select) {
4296 bond_opt_initstr(&newval, ad_select);
4297 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4298 &newval);
4299 if (!valptr) {
4300 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4301 return -EINVAL;
4302 }
4303 params->ad_select = valptr->value;
4304 if (bond_mode != BOND_MODE_8023AD)
4305 pr_warn("ad_select param only affects 802.3ad mode\n");
4306 } else {
4307 params->ad_select = BOND_AD_STABLE;
4308 }
4309
4310 if (max_bonds < 0) {
4311 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4312 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4313 max_bonds = BOND_DEFAULT_MAX_BONDS;
4314 }
4315
4316 if (miimon < 0) {
4317 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4318 miimon, INT_MAX);
4319 miimon = 0;
4320 }
4321
4322 if (updelay < 0) {
4323 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4324 updelay, INT_MAX);
4325 updelay = 0;
4326 }
4327
4328 if (downdelay < 0) {
4329 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4330 downdelay, INT_MAX);
4331 downdelay = 0;
4332 }
4333
4334 if ((use_carrier != 0) && (use_carrier != 1)) {
4335 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4336 use_carrier);
4337 use_carrier = 1;
4338 }
4339
4340 if (num_peer_notif < 0 || num_peer_notif > 255) {
4341 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4342 num_peer_notif);
4343 num_peer_notif = 1;
4344 }
4345
4346 /* reset values for 802.3ad/TLB/ALB */
4347 if (!bond_mode_uses_arp(bond_mode)) {
4348 if (!miimon) {
4349 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");
4350 pr_warn("Forcing miimon to 100msec\n");
4351 miimon = BOND_DEFAULT_MIIMON;
4352 }
4353 }
4354
4355 if (tx_queues < 1 || tx_queues > 255) {
4356 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4357 tx_queues, BOND_DEFAULT_TX_QUEUES);
4358 tx_queues = BOND_DEFAULT_TX_QUEUES;
4359 }
4360
4361 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4362 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4363 all_slaves_active);
4364 all_slaves_active = 0;
4365 }
4366
4367 if (resend_igmp < 0 || resend_igmp > 255) {
4368 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4369 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4370 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4371 }
4372
4373 bond_opt_initval(&newval, packets_per_slave);
4374 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4375 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4376 packets_per_slave, USHRT_MAX);
4377 packets_per_slave = 1;
4378 }
4379
4380 if (bond_mode == BOND_MODE_ALB) {
4381 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",
4382 updelay);
4383 }
4384
4385 if (!miimon) {
4386 if (updelay || downdelay) {
4387 /* just warn the user the up/down delay will have
4388 * no effect since miimon is zero...
4389 */
4390 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",
4391 updelay, downdelay);
4392 }
4393 } else {
4394 /* don't allow arp monitoring */
4395 if (arp_interval) {
4396 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4397 miimon, arp_interval);
4398 arp_interval = 0;
4399 }
4400
4401 if ((updelay % miimon) != 0) {
4402 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4403 updelay, miimon, (updelay / miimon) * miimon);
4404 }
4405
4406 updelay /= miimon;
4407
4408 if ((downdelay % miimon) != 0) {
4409 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4410 downdelay, miimon,
4411 (downdelay / miimon) * miimon);
4412 }
4413
4414 downdelay /= miimon;
4415 }
4416
4417 if (arp_interval < 0) {
4418 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4419 arp_interval, INT_MAX);
4420 arp_interval = 0;
4421 }
4422
4423 for (arp_ip_count = 0, i = 0;
4424 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4425 __be32 ip;
4426
4427 /* not a complete check, but good enough to catch mistakes */
4428 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4429 !bond_is_ip_target_ok(ip)) {
4430 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4431 arp_ip_target[i]);
4432 arp_interval = 0;
4433 } else {
4434 if (bond_get_targets_ip(arp_target, ip) == -1)
4435 arp_target[arp_ip_count++] = ip;
4436 else
4437 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4438 &ip);
4439 }
4440 }
4441
4442 if (arp_interval && !arp_ip_count) {
4443 /* don't allow arping if no arp_ip_target given... */
4444 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4445 arp_interval);
4446 arp_interval = 0;
4447 }
4448
4449 if (arp_validate) {
4450 if (!arp_interval) {
4451 pr_err("arp_validate requires arp_interval\n");
4452 return -EINVAL;
4453 }
4454
4455 bond_opt_initstr(&newval, arp_validate);
4456 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4457 &newval);
4458 if (!valptr) {
4459 pr_err("Error: invalid arp_validate \"%s\"\n",
4460 arp_validate);
4461 return -EINVAL;
4462 }
4463 arp_validate_value = valptr->value;
4464 } else {
4465 arp_validate_value = 0;
4466 }
4467
4468 arp_all_targets_value = 0;
4469 if (arp_all_targets) {
4470 bond_opt_initstr(&newval, arp_all_targets);
4471 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4472 &newval);
4473 if (!valptr) {
4474 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4475 arp_all_targets);
4476 arp_all_targets_value = 0;
4477 } else {
4478 arp_all_targets_value = valptr->value;
4479 }
4480 }
4481
4482 if (miimon) {
4483 pr_info("MII link monitoring set to %d ms\n", miimon);
4484 } else if (arp_interval) {
4485 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4486 arp_validate_value);
4487 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4488 arp_interval, valptr->string, arp_ip_count);
4489
4490 for (i = 0; i < arp_ip_count; i++)
4491 pr_cont(" %s", arp_ip_target[i]);
4492
4493 pr_cont("\n");
4494
4495 } else if (max_bonds) {
4496 /* miimon and arp_interval not set, we need one so things
4497 * work as expected, see bonding.txt for details
4498 */
4499 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");
4500 }
4501
4502 if (primary && !bond_mode_uses_primary(bond_mode)) {
4503 /* currently, using a primary only makes sense
4504 * in active backup, TLB or ALB modes
4505 */
4506 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4507 primary, bond_mode_name(bond_mode));
4508 primary = NULL;
4509 }
4510
4511 if (primary && primary_reselect) {
4512 bond_opt_initstr(&newval, primary_reselect);
4513 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4514 &newval);
4515 if (!valptr) {
4516 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4517 primary_reselect);
4518 return -EINVAL;
4519 }
4520 primary_reselect_value = valptr->value;
4521 } else {
4522 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4523 }
4524
4525 if (fail_over_mac) {
4526 bond_opt_initstr(&newval, fail_over_mac);
4527 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4528 &newval);
4529 if (!valptr) {
4530 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4531 fail_over_mac);
4532 return -EINVAL;
4533 }
4534 fail_over_mac_value = valptr->value;
4535 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4536 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4537 } else {
4538 fail_over_mac_value = BOND_FOM_NONE;
4539 }
4540
4541 bond_opt_initstr(&newval, "default");
4542 valptr = bond_opt_parse(
4543 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4544 &newval);
4545 if (!valptr) {
4546 pr_err("Error: No ad_actor_sys_prio default value");
4547 return -EINVAL;
4548 }
4549 ad_actor_sys_prio = valptr->value;
4550
4551 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4552 &newval);
4553 if (!valptr) {
4554 pr_err("Error: No ad_user_port_key default value");
4555 return -EINVAL;
4556 }
4557 ad_user_port_key = valptr->value;
4558
4559 if (lp_interval == 0) {
4560 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4561 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4562 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4563 }
4564
4565 /* fill params struct with the proper values */
4566 params->mode = bond_mode;
4567 params->xmit_policy = xmit_hashtype;
4568 params->miimon = miimon;
4569 params->num_peer_notif = num_peer_notif;
4570 params->arp_interval = arp_interval;
4571 params->arp_validate = arp_validate_value;
4572 params->arp_all_targets = arp_all_targets_value;
4573 params->updelay = updelay;
4574 params->downdelay = downdelay;
4575 params->use_carrier = use_carrier;
4576 params->lacp_fast = lacp_fast;
4577 params->primary[0] = 0;
4578 params->primary_reselect = primary_reselect_value;
4579 params->fail_over_mac = fail_over_mac_value;
4580 params->tx_queues = tx_queues;
4581 params->all_slaves_active = all_slaves_active;
4582 params->resend_igmp = resend_igmp;
4583 params->min_links = min_links;
4584 params->lp_interval = lp_interval;
4585 params->packets_per_slave = packets_per_slave;
4586 params->tlb_dynamic_lb = 1; /* Default value */
4587 params->ad_actor_sys_prio = ad_actor_sys_prio;
4588 eth_zero_addr(params->ad_actor_system);
4589 params->ad_user_port_key = ad_user_port_key;
4590 if (packets_per_slave > 0) {
4591 params->reciprocal_packets_per_slave =
4592 reciprocal_value(packets_per_slave);
4593 } else {
4594 /* reciprocal_packets_per_slave is unused if
4595 * packets_per_slave is 0 or 1, just initialize it
4596 */
4597 params->reciprocal_packets_per_slave =
4598 (struct reciprocal_value) { 0 };
4599 }
4600
4601 if (primary) {
4602 strncpy(params->primary, primary, IFNAMSIZ);
4603 params->primary[IFNAMSIZ - 1] = 0;
4604 }
4605
4606 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4607
4608 return 0;
4609 }
4610
4611 static struct lock_class_key bonding_netdev_xmit_lock_key;
4612 static struct lock_class_key bonding_netdev_addr_lock_key;
4613 static struct lock_class_key bonding_tx_busylock_key;
4614
4615 static void bond_set_lockdep_class_one(struct net_device *dev,
4616 struct netdev_queue *txq,
4617 void *_unused)
4618 {
4619 lockdep_set_class(&txq->_xmit_lock,
4620 &bonding_netdev_xmit_lock_key);
4621 }
4622
4623 static void bond_set_lockdep_class(struct net_device *dev)
4624 {
4625 lockdep_set_class(&dev->addr_list_lock,
4626 &bonding_netdev_addr_lock_key);
4627 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4628 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4629 }
4630
4631 /* Called from registration process */
4632 static int bond_init(struct net_device *bond_dev)
4633 {
4634 struct bonding *bond = netdev_priv(bond_dev);
4635 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4636
4637 netdev_dbg(bond_dev, "Begin bond_init\n");
4638
4639 bond->wq = create_singlethread_workqueue(bond_dev->name);
4640 if (!bond->wq)
4641 return -ENOMEM;
4642
4643 bond_set_lockdep_class(bond_dev);
4644
4645 list_add_tail(&bond->bond_list, &bn->dev_list);
4646
4647 bond_prepare_sysfs_group(bond);
4648
4649 bond_debug_register(bond);
4650
4651 /* Ensure valid dev_addr */
4652 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4653 bond_dev->addr_assign_type == NET_ADDR_PERM)
4654 eth_hw_addr_random(bond_dev);
4655
4656 return 0;
4657 }
4658
4659 unsigned int bond_get_num_tx_queues(void)
4660 {
4661 return tx_queues;
4662 }
4663
4664 /* Create a new bond based on the specified name and bonding parameters.
4665 * If name is NULL, obtain a suitable "bond%d" name for us.
4666 * Caller must NOT hold rtnl_lock; we need to release it here before we
4667 * set up our sysfs entries.
4668 */
4669 int bond_create(struct net *net, const char *name)
4670 {
4671 struct net_device *bond_dev;
4672 struct bonding *bond;
4673 struct alb_bond_info *bond_info;
4674 int res;
4675
4676 rtnl_lock();
4677
4678 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4679 name ? name : "bond%d", NET_NAME_UNKNOWN,
4680 bond_setup, tx_queues);
4681 if (!bond_dev) {
4682 pr_err("%s: eek! can't alloc netdev!\n", name);
4683 rtnl_unlock();
4684 return -ENOMEM;
4685 }
4686
4687 /*
4688 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4689 * It is set to 0 by default which is wrong.
4690 */
4691 bond = netdev_priv(bond_dev);
4692 bond_info = &(BOND_ALB_INFO(bond));
4693 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4694
4695 dev_net_set(bond_dev, net);
4696 bond_dev->rtnl_link_ops = &bond_link_ops;
4697
4698 res = register_netdevice(bond_dev);
4699
4700 netif_carrier_off(bond_dev);
4701
4702 rtnl_unlock();
4703 if (res < 0)
4704 bond_destructor(bond_dev);
4705 return res;
4706 }
4707
4708 static int __net_init bond_net_init(struct net *net)
4709 {
4710 struct bond_net *bn = net_generic(net, bond_net_id);
4711
4712 bn->net = net;
4713 INIT_LIST_HEAD(&bn->dev_list);
4714
4715 bond_create_proc_dir(bn);
4716 bond_create_sysfs(bn);
4717
4718 return 0;
4719 }
4720
4721 static void __net_exit bond_net_exit(struct net *net)
4722 {
4723 struct bond_net *bn = net_generic(net, bond_net_id);
4724 struct bonding *bond, *tmp_bond;
4725 LIST_HEAD(list);
4726
4727 bond_destroy_sysfs(bn);
4728
4729 /* Kill off any bonds created after unregistering bond rtnl ops */
4730 rtnl_lock();
4731 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4732 unregister_netdevice_queue(bond->dev, &list);
4733 unregister_netdevice_many(&list);
4734 rtnl_unlock();
4735
4736 bond_destroy_proc_dir(bn);
4737 }
4738
4739 static struct pernet_operations bond_net_ops = {
4740 .init = bond_net_init,
4741 .exit = bond_net_exit,
4742 .id = &bond_net_id,
4743 .size = sizeof(struct bond_net),
4744 };
4745
4746 static int __init bonding_init(void)
4747 {
4748 int i;
4749 int res;
4750
4751 pr_info("%s", bond_version);
4752
4753 res = bond_check_params(&bonding_defaults);
4754 if (res)
4755 goto out;
4756
4757 res = register_pernet_subsys(&bond_net_ops);
4758 if (res)
4759 goto out;
4760
4761 res = bond_netlink_init();
4762 if (res)
4763 goto err_link;
4764
4765 bond_create_debugfs();
4766
4767 for (i = 0; i < max_bonds; i++) {
4768 res = bond_create(&init_net, NULL);
4769 if (res)
4770 goto err;
4771 }
4772
4773 register_netdevice_notifier(&bond_netdev_notifier);
4774 out:
4775 return res;
4776 err:
4777 bond_destroy_debugfs();
4778 bond_netlink_fini();
4779 err_link:
4780 unregister_pernet_subsys(&bond_net_ops);
4781 goto out;
4782
4783 }
4784
4785 static void __exit bonding_exit(void)
4786 {
4787 unregister_netdevice_notifier(&bond_netdev_notifier);
4788
4789 bond_destroy_debugfs();
4790
4791 bond_netlink_fini();
4792 unregister_pernet_subsys(&bond_net_ops);
4793
4794 #ifdef CONFIG_NET_POLL_CONTROLLER
4795 /* Make sure we don't have an imbalance on our netpoll blocking */
4796 WARN_ON(atomic_read(&netpoll_block_tx));
4797 #endif
4798 }
4799
4800 module_init(bonding_init);
4801 module_exit(bonding_exit);
4802 MODULE_LICENSE("GPL");
4803 MODULE_VERSION(DRV_VERSION);
4804 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4805 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
Linux kernel - Deliverables
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