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Merge tag 'trace-fixes-v4.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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_cmd ecmd;
380 u32 slave_speed;
381 int res;
382
383 slave->speed = SPEED_UNKNOWN;
384 slave->duplex = DUPLEX_UNKNOWN;
385
386 res = __ethtool_get_settings(slave_dev, &ecmd);
387 if (res < 0)
388 return;
389
390 slave_speed = ethtool_cmd_speed(&ecmd);
391 if (slave_speed == 0 || slave_speed == ((__u32) -1))
392 return;
393
394 switch (ecmd.duplex) {
395 case DUPLEX_FULL:
396 case DUPLEX_HALF:
397 break;
398 default:
399 return;
400 }
401
402 slave->speed = slave_speed;
403 slave->duplex = ecmd.duplex;
404
405 return;
406 }
407
408 const char *bond_slave_link_status(s8 link)
409 {
410 switch (link) {
411 case BOND_LINK_UP:
412 return "up";
413 case BOND_LINK_FAIL:
414 return "going down";
415 case BOND_LINK_DOWN:
416 return "down";
417 case BOND_LINK_BACK:
418 return "going back";
419 default:
420 return "unknown";
421 }
422 }
423
424 /* if <dev> supports MII link status reporting, check its link status.
425 *
426 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
427 * depending upon the setting of the use_carrier parameter.
428 *
429 * Return either BMSR_LSTATUS, meaning that the link is up (or we
430 * can't tell and just pretend it is), or 0, meaning that the link is
431 * down.
432 *
433 * If reporting is non-zero, instead of faking link up, return -1 if
434 * both ETHTOOL and MII ioctls fail (meaning the device does not
435 * support them). If use_carrier is set, return whatever it says.
436 * It'd be nice if there was a good way to tell if a driver supports
437 * netif_carrier, but there really isn't.
438 */
439 static int bond_check_dev_link(struct bonding *bond,
440 struct net_device *slave_dev, int reporting)
441 {
442 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
443 int (*ioctl)(struct net_device *, struct ifreq *, int);
444 struct ifreq ifr;
445 struct mii_ioctl_data *mii;
446
447 if (!reporting && !netif_running(slave_dev))
448 return 0;
449
450 if (bond->params.use_carrier)
451 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
452
453 /* Try to get link status using Ethtool first. */
454 if (slave_dev->ethtool_ops->get_link)
455 return slave_dev->ethtool_ops->get_link(slave_dev) ?
456 BMSR_LSTATUS : 0;
457
458 /* Ethtool can't be used, fallback to MII ioctls. */
459 ioctl = slave_ops->ndo_do_ioctl;
460 if (ioctl) {
461 /* TODO: set pointer to correct ioctl on a per team member
462 * bases to make this more efficient. that is, once
463 * we determine the correct ioctl, we will always
464 * call it and not the others for that team
465 * member.
466 */
467
468 /* We cannot assume that SIOCGMIIPHY will also read a
469 * register; not all network drivers (e.g., e100)
470 * support that.
471 */
472
473 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
474 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
475 mii = if_mii(&ifr);
476 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
477 mii->reg_num = MII_BMSR;
478 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
479 return mii->val_out & BMSR_LSTATUS;
480 }
481 }
482
483 /* If reporting, report that either there's no dev->do_ioctl,
484 * or both SIOCGMIIREG and get_link failed (meaning that we
485 * cannot report link status). If not reporting, pretend
486 * we're ok.
487 */
488 return reporting ? -1 : BMSR_LSTATUS;
489 }
490
491 /*----------------------------- Multicast list ------------------------------*/
492
493 /* Push the promiscuity flag down to appropriate slaves */
494 static int bond_set_promiscuity(struct bonding *bond, int inc)
495 {
496 struct list_head *iter;
497 int err = 0;
498
499 if (bond_uses_primary(bond)) {
500 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
501
502 if (curr_active)
503 err = dev_set_promiscuity(curr_active->dev, inc);
504 } else {
505 struct slave *slave;
506
507 bond_for_each_slave(bond, slave, iter) {
508 err = dev_set_promiscuity(slave->dev, inc);
509 if (err)
510 return err;
511 }
512 }
513 return err;
514 }
515
516 /* Push the allmulti flag down to all slaves */
517 static int bond_set_allmulti(struct bonding *bond, int inc)
518 {
519 struct list_head *iter;
520 int err = 0;
521
522 if (bond_uses_primary(bond)) {
523 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
524
525 if (curr_active)
526 err = dev_set_allmulti(curr_active->dev, inc);
527 } else {
528 struct slave *slave;
529
530 bond_for_each_slave(bond, slave, iter) {
531 err = dev_set_allmulti(slave->dev, inc);
532 if (err)
533 return err;
534 }
535 }
536 return err;
537 }
538
539 /* Retrieve the list of registered multicast addresses for the bonding
540 * device and retransmit an IGMP JOIN request to the current active
541 * slave.
542 */
543 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
544 {
545 struct bonding *bond = container_of(work, struct bonding,
546 mcast_work.work);
547
548 if (!rtnl_trylock()) {
549 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
550 return;
551 }
552 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
553
554 if (bond->igmp_retrans > 1) {
555 bond->igmp_retrans--;
556 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
557 }
558 rtnl_unlock();
559 }
560
561 /* Flush bond's hardware addresses from slave */
562 static void bond_hw_addr_flush(struct net_device *bond_dev,
563 struct net_device *slave_dev)
564 {
565 struct bonding *bond = netdev_priv(bond_dev);
566
567 dev_uc_unsync(slave_dev, bond_dev);
568 dev_mc_unsync(slave_dev, bond_dev);
569
570 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
571 /* del lacpdu mc addr from mc list */
572 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
573
574 dev_mc_del(slave_dev, lacpdu_multicast);
575 }
576 }
577
578 /*--------------------------- Active slave change ---------------------------*/
579
580 /* Update the hardware address list and promisc/allmulti for the new and
581 * old active slaves (if any). Modes that are not using primary keep all
582 * slaves up date at all times; only the modes that use primary need to call
583 * this function to swap these settings during a failover.
584 */
585 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
586 struct slave *old_active)
587 {
588 if (old_active) {
589 if (bond->dev->flags & IFF_PROMISC)
590 dev_set_promiscuity(old_active->dev, -1);
591
592 if (bond->dev->flags & IFF_ALLMULTI)
593 dev_set_allmulti(old_active->dev, -1);
594
595 bond_hw_addr_flush(bond->dev, old_active->dev);
596 }
597
598 if (new_active) {
599 /* FIXME: Signal errors upstream. */
600 if (bond->dev->flags & IFF_PROMISC)
601 dev_set_promiscuity(new_active->dev, 1);
602
603 if (bond->dev->flags & IFF_ALLMULTI)
604 dev_set_allmulti(new_active->dev, 1);
605
606 netif_addr_lock_bh(bond->dev);
607 dev_uc_sync(new_active->dev, bond->dev);
608 dev_mc_sync(new_active->dev, bond->dev);
609 netif_addr_unlock_bh(bond->dev);
610 }
611 }
612
613 /**
614 * bond_set_dev_addr - clone slave's address to bond
615 * @bond_dev: bond net device
616 * @slave_dev: slave net device
617 *
618 * Should be called with RTNL held.
619 */
620 static void bond_set_dev_addr(struct net_device *bond_dev,
621 struct net_device *slave_dev)
622 {
623 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
624 bond_dev, slave_dev, slave_dev->addr_len);
625 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
626 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
627 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
628 }
629
630 static struct slave *bond_get_old_active(struct bonding *bond,
631 struct slave *new_active)
632 {
633 struct slave *slave;
634 struct list_head *iter;
635
636 bond_for_each_slave(bond, slave, iter) {
637 if (slave == new_active)
638 continue;
639
640 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
641 return slave;
642 }
643
644 return NULL;
645 }
646
647 /* bond_do_fail_over_mac
648 *
649 * Perform special MAC address swapping for fail_over_mac settings
650 *
651 * Called with RTNL
652 */
653 static void bond_do_fail_over_mac(struct bonding *bond,
654 struct slave *new_active,
655 struct slave *old_active)
656 {
657 u8 tmp_mac[ETH_ALEN];
658 struct sockaddr saddr;
659 int rv;
660
661 switch (bond->params.fail_over_mac) {
662 case BOND_FOM_ACTIVE:
663 if (new_active)
664 bond_set_dev_addr(bond->dev, new_active->dev);
665 break;
666 case BOND_FOM_FOLLOW:
667 /* if new_active && old_active, swap them
668 * if just old_active, do nothing (going to no active slave)
669 * if just new_active, set new_active to bond's MAC
670 */
671 if (!new_active)
672 return;
673
674 if (!old_active)
675 old_active = bond_get_old_active(bond, new_active);
676
677 if (old_active) {
678 ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
679 ether_addr_copy(saddr.sa_data,
680 old_active->dev->dev_addr);
681 saddr.sa_family = new_active->dev->type;
682 } else {
683 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
684 saddr.sa_family = bond->dev->type;
685 }
686
687 rv = dev_set_mac_address(new_active->dev, &saddr);
688 if (rv) {
689 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
690 -rv, new_active->dev->name);
691 goto out;
692 }
693
694 if (!old_active)
695 goto out;
696
697 ether_addr_copy(saddr.sa_data, tmp_mac);
698 saddr.sa_family = old_active->dev->type;
699
700 rv = dev_set_mac_address(old_active->dev, &saddr);
701 if (rv)
702 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
703 -rv, new_active->dev->name);
704 out:
705 break;
706 default:
707 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
708 bond->params.fail_over_mac);
709 break;
710 }
711
712 }
713
714 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
715 {
716 struct slave *prim = rtnl_dereference(bond->primary_slave);
717 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
718
719 if (!prim || prim->link != BOND_LINK_UP) {
720 if (!curr || curr->link != BOND_LINK_UP)
721 return NULL;
722 return curr;
723 }
724
725 if (bond->force_primary) {
726 bond->force_primary = false;
727 return prim;
728 }
729
730 if (!curr || curr->link != BOND_LINK_UP)
731 return prim;
732
733 /* At this point, prim and curr are both up */
734 switch (bond->params.primary_reselect) {
735 case BOND_PRI_RESELECT_ALWAYS:
736 return prim;
737 case BOND_PRI_RESELECT_BETTER:
738 if (prim->speed < curr->speed)
739 return curr;
740 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
741 return curr;
742 return prim;
743 case BOND_PRI_RESELECT_FAILURE:
744 return curr;
745 default:
746 netdev_err(bond->dev, "impossible primary_reselect %d\n",
747 bond->params.primary_reselect);
748 return curr;
749 }
750 }
751
752 /**
753 * bond_find_best_slave - select the best available slave to be the active one
754 * @bond: our bonding struct
755 */
756 static struct slave *bond_find_best_slave(struct bonding *bond)
757 {
758 struct slave *slave, *bestslave = NULL;
759 struct list_head *iter;
760 int mintime = bond->params.updelay;
761
762 slave = bond_choose_primary_or_current(bond);
763 if (slave)
764 return slave;
765
766 bond_for_each_slave(bond, slave, iter) {
767 if (slave->link == BOND_LINK_UP)
768 return slave;
769 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
770 slave->delay < mintime) {
771 mintime = slave->delay;
772 bestslave = slave;
773 }
774 }
775
776 return bestslave;
777 }
778
779 static bool bond_should_notify_peers(struct bonding *bond)
780 {
781 struct slave *slave;
782
783 rcu_read_lock();
784 slave = rcu_dereference(bond->curr_active_slave);
785 rcu_read_unlock();
786
787 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
788 slave ? slave->dev->name : "NULL");
789
790 if (!slave || !bond->send_peer_notif ||
791 !netif_carrier_ok(bond->dev) ||
792 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
793 return false;
794
795 return true;
796 }
797
798 /**
799 * change_active_interface - change the active slave into the specified one
800 * @bond: our bonding struct
801 * @new: the new slave to make the active one
802 *
803 * Set the new slave to the bond's settings and unset them on the old
804 * curr_active_slave.
805 * Setting include flags, mc-list, promiscuity, allmulti, etc.
806 *
807 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
808 * because it is apparently the best available slave we have, even though its
809 * updelay hasn't timed out yet.
810 *
811 * Caller must hold RTNL.
812 */
813 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
814 {
815 struct slave *old_active;
816
817 ASSERT_RTNL();
818
819 old_active = rtnl_dereference(bond->curr_active_slave);
820
821 if (old_active == new_active)
822 return;
823
824 if (new_active) {
825 new_active->last_link_up = jiffies;
826
827 if (new_active->link == BOND_LINK_BACK) {
828 if (bond_uses_primary(bond)) {
829 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
830 new_active->dev->name,
831 (bond->params.updelay - new_active->delay) * bond->params.miimon);
832 }
833
834 new_active->delay = 0;
835 bond_set_slave_link_state(new_active, BOND_LINK_UP,
836 BOND_SLAVE_NOTIFY_NOW);
837
838 if (BOND_MODE(bond) == BOND_MODE_8023AD)
839 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
840
841 if (bond_is_lb(bond))
842 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
843 } else {
844 if (bond_uses_primary(bond)) {
845 netdev_info(bond->dev, "making interface %s the new active one\n",
846 new_active->dev->name);
847 }
848 }
849 }
850
851 if (bond_uses_primary(bond))
852 bond_hw_addr_swap(bond, new_active, old_active);
853
854 if (bond_is_lb(bond)) {
855 bond_alb_handle_active_change(bond, new_active);
856 if (old_active)
857 bond_set_slave_inactive_flags(old_active,
858 BOND_SLAVE_NOTIFY_NOW);
859 if (new_active)
860 bond_set_slave_active_flags(new_active,
861 BOND_SLAVE_NOTIFY_NOW);
862 } else {
863 rcu_assign_pointer(bond->curr_active_slave, new_active);
864 }
865
866 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
867 if (old_active)
868 bond_set_slave_inactive_flags(old_active,
869 BOND_SLAVE_NOTIFY_NOW);
870
871 if (new_active) {
872 bool should_notify_peers = false;
873
874 bond_set_slave_active_flags(new_active,
875 BOND_SLAVE_NOTIFY_NOW);
876
877 if (bond->params.fail_over_mac)
878 bond_do_fail_over_mac(bond, new_active,
879 old_active);
880
881 if (netif_running(bond->dev)) {
882 bond->send_peer_notif =
883 bond->params.num_peer_notif;
884 should_notify_peers =
885 bond_should_notify_peers(bond);
886 }
887
888 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
889 if (should_notify_peers)
890 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
891 bond->dev);
892 }
893 }
894
895 /* resend IGMP joins since active slave has changed or
896 * all were sent on curr_active_slave.
897 * resend only if bond is brought up with the affected
898 * bonding modes and the retransmission is enabled
899 */
900 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
901 ((bond_uses_primary(bond) && new_active) ||
902 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
903 bond->igmp_retrans = bond->params.resend_igmp;
904 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
905 }
906 }
907
908 /**
909 * bond_select_active_slave - select a new active slave, if needed
910 * @bond: our bonding struct
911 *
912 * This functions should be called when one of the following occurs:
913 * - The old curr_active_slave has been released or lost its link.
914 * - The primary_slave has got its link back.
915 * - A slave has got its link back and there's no old curr_active_slave.
916 *
917 * Caller must hold RTNL.
918 */
919 void bond_select_active_slave(struct bonding *bond)
920 {
921 struct slave *best_slave;
922 int rv;
923
924 ASSERT_RTNL();
925
926 best_slave = bond_find_best_slave(bond);
927 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
928 bond_change_active_slave(bond, best_slave);
929 rv = bond_set_carrier(bond);
930 if (!rv)
931 return;
932
933 if (netif_carrier_ok(bond->dev)) {
934 netdev_info(bond->dev, "first active interface up!\n");
935 } else {
936 netdev_info(bond->dev, "now running without any active interface!\n");
937 }
938 }
939 }
940
941 #ifdef CONFIG_NET_POLL_CONTROLLER
942 static inline int slave_enable_netpoll(struct slave *slave)
943 {
944 struct netpoll *np;
945 int err = 0;
946
947 np = kzalloc(sizeof(*np), GFP_KERNEL);
948 err = -ENOMEM;
949 if (!np)
950 goto out;
951
952 err = __netpoll_setup(np, slave->dev);
953 if (err) {
954 kfree(np);
955 goto out;
956 }
957 slave->np = np;
958 out:
959 return err;
960 }
961 static inline void slave_disable_netpoll(struct slave *slave)
962 {
963 struct netpoll *np = slave->np;
964
965 if (!np)
966 return;
967
968 slave->np = NULL;
969 __netpoll_free_async(np);
970 }
971
972 static void bond_poll_controller(struct net_device *bond_dev)
973 {
974 struct bonding *bond = netdev_priv(bond_dev);
975 struct slave *slave = NULL;
976 struct list_head *iter;
977 struct ad_info ad_info;
978 struct netpoll_info *ni;
979 const struct net_device_ops *ops;
980
981 if (BOND_MODE(bond) == BOND_MODE_8023AD)
982 if (bond_3ad_get_active_agg_info(bond, &ad_info))
983 return;
984
985 bond_for_each_slave_rcu(bond, slave, iter) {
986 ops = slave->dev->netdev_ops;
987 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
988 continue;
989
990 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
991 struct aggregator *agg =
992 SLAVE_AD_INFO(slave)->port.aggregator;
993
994 if (agg &&
995 agg->aggregator_identifier != ad_info.aggregator_id)
996 continue;
997 }
998
999 ni = rcu_dereference_bh(slave->dev->npinfo);
1000 if (down_trylock(&ni->dev_lock))
1001 continue;
1002 ops->ndo_poll_controller(slave->dev);
1003 up(&ni->dev_lock);
1004 }
1005 }
1006
1007 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1008 {
1009 struct bonding *bond = netdev_priv(bond_dev);
1010 struct list_head *iter;
1011 struct slave *slave;
1012
1013 bond_for_each_slave(bond, slave, iter)
1014 if (bond_slave_is_up(slave))
1015 slave_disable_netpoll(slave);
1016 }
1017
1018 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1019 {
1020 struct bonding *bond = netdev_priv(dev);
1021 struct list_head *iter;
1022 struct slave *slave;
1023 int err = 0;
1024
1025 bond_for_each_slave(bond, slave, iter) {
1026 err = slave_enable_netpoll(slave);
1027 if (err) {
1028 bond_netpoll_cleanup(dev);
1029 break;
1030 }
1031 }
1032 return err;
1033 }
1034 #else
1035 static inline int slave_enable_netpoll(struct slave *slave)
1036 {
1037 return 0;
1038 }
1039 static inline void slave_disable_netpoll(struct slave *slave)
1040 {
1041 }
1042 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1043 {
1044 }
1045 #endif
1046
1047 /*---------------------------------- IOCTL ----------------------------------*/
1048
1049 static netdev_features_t bond_fix_features(struct net_device *dev,
1050 netdev_features_t features)
1051 {
1052 struct bonding *bond = netdev_priv(dev);
1053 struct list_head *iter;
1054 netdev_features_t mask;
1055 struct slave *slave;
1056
1057 mask = features;
1058
1059 features &= ~NETIF_F_ONE_FOR_ALL;
1060 features |= NETIF_F_ALL_FOR_ALL;
1061
1062 bond_for_each_slave(bond, slave, iter) {
1063 features = netdev_increment_features(features,
1064 slave->dev->features,
1065 mask);
1066 }
1067 features = netdev_add_tso_features(features, mask);
1068
1069 return features;
1070 }
1071
1072 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1073 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1074 NETIF_F_HIGHDMA | NETIF_F_LRO)
1075
1076 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1077 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1078
1079 static void bond_compute_features(struct bonding *bond)
1080 {
1081 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1082 IFF_XMIT_DST_RELEASE_PERM;
1083 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1084 netdev_features_t enc_features = BOND_ENC_FEATURES;
1085 struct net_device *bond_dev = bond->dev;
1086 struct list_head *iter;
1087 struct slave *slave;
1088 unsigned short max_hard_header_len = ETH_HLEN;
1089 unsigned int gso_max_size = GSO_MAX_SIZE;
1090 u16 gso_max_segs = GSO_MAX_SEGS;
1091
1092 if (!bond_has_slaves(bond))
1093 goto done;
1094 vlan_features &= NETIF_F_ALL_FOR_ALL;
1095
1096 bond_for_each_slave(bond, slave, iter) {
1097 vlan_features = netdev_increment_features(vlan_features,
1098 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1099
1100 enc_features = netdev_increment_features(enc_features,
1101 slave->dev->hw_enc_features,
1102 BOND_ENC_FEATURES);
1103 dst_release_flag &= slave->dev->priv_flags;
1104 if (slave->dev->hard_header_len > max_hard_header_len)
1105 max_hard_header_len = slave->dev->hard_header_len;
1106
1107 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1108 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1109 }
1110
1111 done:
1112 bond_dev->vlan_features = vlan_features;
1113 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1114 bond_dev->hard_header_len = max_hard_header_len;
1115 bond_dev->gso_max_segs = gso_max_segs;
1116 netif_set_gso_max_size(bond_dev, gso_max_size);
1117
1118 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1119 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1120 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1121 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1122
1123 netdev_change_features(bond_dev);
1124 }
1125
1126 static void bond_setup_by_slave(struct net_device *bond_dev,
1127 struct net_device *slave_dev)
1128 {
1129 bond_dev->header_ops = slave_dev->header_ops;
1130
1131 bond_dev->type = slave_dev->type;
1132 bond_dev->hard_header_len = slave_dev->hard_header_len;
1133 bond_dev->addr_len = slave_dev->addr_len;
1134
1135 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1136 slave_dev->addr_len);
1137 }
1138
1139 /* On bonding slaves other than the currently active slave, suppress
1140 * duplicates except for alb non-mcast/bcast.
1141 */
1142 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1143 struct slave *slave,
1144 struct bonding *bond)
1145 {
1146 if (bond_is_slave_inactive(slave)) {
1147 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1148 skb->pkt_type != PACKET_BROADCAST &&
1149 skb->pkt_type != PACKET_MULTICAST)
1150 return false;
1151 return true;
1152 }
1153 return false;
1154 }
1155
1156 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1157 {
1158 struct sk_buff *skb = *pskb;
1159 struct slave *slave;
1160 struct bonding *bond;
1161 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1162 struct slave *);
1163 int ret = RX_HANDLER_ANOTHER;
1164
1165 skb = skb_share_check(skb, GFP_ATOMIC);
1166 if (unlikely(!skb))
1167 return RX_HANDLER_CONSUMED;
1168
1169 *pskb = skb;
1170
1171 slave = bond_slave_get_rcu(skb->dev);
1172 bond = slave->bond;
1173
1174 recv_probe = ACCESS_ONCE(bond->recv_probe);
1175 if (recv_probe) {
1176 ret = recv_probe(skb, bond, slave);
1177 if (ret == RX_HANDLER_CONSUMED) {
1178 consume_skb(skb);
1179 return ret;
1180 }
1181 }
1182
1183 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1184 return RX_HANDLER_EXACT;
1185 }
1186
1187 skb->dev = bond->dev;
1188
1189 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1190 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1191 skb->pkt_type == PACKET_HOST) {
1192
1193 if (unlikely(skb_cow_head(skb,
1194 skb->data - skb_mac_header(skb)))) {
1195 kfree_skb(skb);
1196 return RX_HANDLER_CONSUMED;
1197 }
1198 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1199 }
1200
1201 return ret;
1202 }
1203
1204 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1205 {
1206 switch (BOND_MODE(bond)) {
1207 case BOND_MODE_ROUNDROBIN:
1208 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1209 case BOND_MODE_ACTIVEBACKUP:
1210 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1211 case BOND_MODE_BROADCAST:
1212 return NETDEV_LAG_TX_TYPE_BROADCAST;
1213 case BOND_MODE_XOR:
1214 case BOND_MODE_8023AD:
1215 return NETDEV_LAG_TX_TYPE_HASH;
1216 default:
1217 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1218 }
1219 }
1220
1221 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave)
1222 {
1223 struct netdev_lag_upper_info lag_upper_info;
1224 int err;
1225
1226 lag_upper_info.tx_type = bond_lag_tx_type(bond);
1227 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1228 &lag_upper_info);
1229 if (err)
1230 return err;
1231 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1232 return 0;
1233 }
1234
1235 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1236 {
1237 netdev_upper_dev_unlink(slave->dev, bond->dev);
1238 slave->dev->flags &= ~IFF_SLAVE;
1239 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1240 }
1241
1242 static struct slave *bond_alloc_slave(struct bonding *bond)
1243 {
1244 struct slave *slave = NULL;
1245
1246 slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1247 if (!slave)
1248 return NULL;
1249
1250 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1251 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1252 GFP_KERNEL);
1253 if (!SLAVE_AD_INFO(slave)) {
1254 kfree(slave);
1255 return NULL;
1256 }
1257 }
1258 return slave;
1259 }
1260
1261 static void bond_free_slave(struct slave *slave)
1262 {
1263 struct bonding *bond = bond_get_bond_by_slave(slave);
1264
1265 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1266 kfree(SLAVE_AD_INFO(slave));
1267
1268 kfree(slave);
1269 }
1270
1271 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1272 {
1273 info->bond_mode = BOND_MODE(bond);
1274 info->miimon = bond->params.miimon;
1275 info->num_slaves = bond->slave_cnt;
1276 }
1277
1278 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1279 {
1280 strcpy(info->slave_name, slave->dev->name);
1281 info->link = slave->link;
1282 info->state = bond_slave_state(slave);
1283 info->link_failure_count = slave->link_failure_count;
1284 }
1285
1286 static void bond_netdev_notify(struct net_device *dev,
1287 struct netdev_bonding_info *info)
1288 {
1289 rtnl_lock();
1290 netdev_bonding_info_change(dev, info);
1291 rtnl_unlock();
1292 }
1293
1294 static void bond_netdev_notify_work(struct work_struct *_work)
1295 {
1296 struct netdev_notify_work *w =
1297 container_of(_work, struct netdev_notify_work, work.work);
1298
1299 bond_netdev_notify(w->dev, &w->bonding_info);
1300 dev_put(w->dev);
1301 kfree(w);
1302 }
1303
1304 void bond_queue_slave_event(struct slave *slave)
1305 {
1306 struct bonding *bond = slave->bond;
1307 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1308
1309 if (!nnw)
1310 return;
1311
1312 dev_hold(slave->dev);
1313 nnw->dev = slave->dev;
1314 bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1315 bond_fill_ifbond(bond, &nnw->bonding_info.master);
1316 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1317
1318 queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1319 }
1320
1321 void bond_lower_state_changed(struct slave *slave)
1322 {
1323 struct netdev_lag_lower_state_info info;
1324
1325 info.link_up = slave->link == BOND_LINK_UP ||
1326 slave->link == BOND_LINK_FAIL;
1327 info.tx_enabled = bond_is_active_slave(slave);
1328 netdev_lower_state_changed(slave->dev, &info);
1329 }
1330
1331 /* enslave device <slave> to bond device <master> */
1332 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1333 {
1334 struct bonding *bond = netdev_priv(bond_dev);
1335 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1336 struct slave *new_slave = NULL, *prev_slave;
1337 struct sockaddr addr;
1338 int link_reporting;
1339 int res = 0, i;
1340
1341 if (!bond->params.use_carrier &&
1342 slave_dev->ethtool_ops->get_link == NULL &&
1343 slave_ops->ndo_do_ioctl == NULL) {
1344 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1345 slave_dev->name);
1346 }
1347
1348 /* already enslaved */
1349 if (slave_dev->flags & IFF_SLAVE) {
1350 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1351 return -EBUSY;
1352 }
1353
1354 if (bond_dev == slave_dev) {
1355 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1356 return -EPERM;
1357 }
1358
1359 /* vlan challenged mutual exclusion */
1360 /* no need to lock since we're protected by rtnl_lock */
1361 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1362 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1363 slave_dev->name);
1364 if (vlan_uses_dev(bond_dev)) {
1365 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1366 slave_dev->name, bond_dev->name);
1367 return -EPERM;
1368 } else {
1369 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1370 slave_dev->name, slave_dev->name,
1371 bond_dev->name);
1372 }
1373 } else {
1374 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1375 slave_dev->name);
1376 }
1377
1378 /* Old ifenslave binaries are no longer supported. These can
1379 * be identified with moderate accuracy by the state of the slave:
1380 * the current ifenslave will set the interface down prior to
1381 * enslaving it; the old ifenslave will not.
1382 */
1383 if (slave_dev->flags & IFF_UP) {
1384 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1385 slave_dev->name);
1386 res = -EPERM;
1387 goto err_undo_flags;
1388 }
1389
1390 /* set bonding device ether type by slave - bonding netdevices are
1391 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1392 * there is a need to override some of the type dependent attribs/funcs.
1393 *
1394 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1395 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1396 */
1397 if (!bond_has_slaves(bond)) {
1398 if (bond_dev->type != slave_dev->type) {
1399 netdev_dbg(bond_dev, "change device type from %d to %d\n",
1400 bond_dev->type, slave_dev->type);
1401
1402 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1403 bond_dev);
1404 res = notifier_to_errno(res);
1405 if (res) {
1406 netdev_err(bond_dev, "refused to change device type\n");
1407 res = -EBUSY;
1408 goto err_undo_flags;
1409 }
1410
1411 /* Flush unicast and multicast addresses */
1412 dev_uc_flush(bond_dev);
1413 dev_mc_flush(bond_dev);
1414
1415 if (slave_dev->type != ARPHRD_ETHER)
1416 bond_setup_by_slave(bond_dev, slave_dev);
1417 else {
1418 ether_setup(bond_dev);
1419 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1420 }
1421
1422 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1423 bond_dev);
1424 }
1425 } else if (bond_dev->type != slave_dev->type) {
1426 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1427 slave_dev->name, slave_dev->type, bond_dev->type);
1428 res = -EINVAL;
1429 goto err_undo_flags;
1430 }
1431
1432 if (slave_ops->ndo_set_mac_address == NULL) {
1433 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1434 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1435 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1436 if (!bond_has_slaves(bond)) {
1437 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1438 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1439 } else {
1440 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");
1441 res = -EOPNOTSUPP;
1442 goto err_undo_flags;
1443 }
1444 }
1445 }
1446
1447 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1448
1449 /* If this is the first slave, then we need to set the master's hardware
1450 * address to be the same as the slave's.
1451 */
1452 if (!bond_has_slaves(bond) &&
1453 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1454 bond_set_dev_addr(bond->dev, slave_dev);
1455
1456 new_slave = bond_alloc_slave(bond);
1457 if (!new_slave) {
1458 res = -ENOMEM;
1459 goto err_undo_flags;
1460 }
1461
1462 new_slave->bond = bond;
1463 new_slave->dev = slave_dev;
1464 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1465 * is set via sysfs or module option if desired.
1466 */
1467 new_slave->queue_id = 0;
1468
1469 /* Save slave's original mtu and then set it to match the bond */
1470 new_slave->original_mtu = slave_dev->mtu;
1471 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1472 if (res) {
1473 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1474 goto err_free;
1475 }
1476
1477 /* Save slave's original ("permanent") mac address for modes
1478 * that need it, and for restoring it upon release, and then
1479 * set it to the master's address
1480 */
1481 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1482
1483 if (!bond->params.fail_over_mac ||
1484 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1485 /* Set slave to master's mac address. The application already
1486 * set the master's mac address to that of the first slave
1487 */
1488 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1489 addr.sa_family = slave_dev->type;
1490 res = dev_set_mac_address(slave_dev, &addr);
1491 if (res) {
1492 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1493 goto err_restore_mtu;
1494 }
1495 }
1496
1497 /* set slave flag before open to prevent IPv6 addrconf */
1498 slave_dev->flags |= IFF_SLAVE;
1499
1500 /* open the slave since the application closed it */
1501 res = dev_open(slave_dev);
1502 if (res) {
1503 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1504 goto err_restore_mac;
1505 }
1506
1507 slave_dev->priv_flags |= IFF_BONDING;
1508 /* initialize slave stats */
1509 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1510
1511 if (bond_is_lb(bond)) {
1512 /* bond_alb_init_slave() must be called before all other stages since
1513 * it might fail and we do not want to have to undo everything
1514 */
1515 res = bond_alb_init_slave(bond, new_slave);
1516 if (res)
1517 goto err_close;
1518 }
1519
1520 /* If the mode uses primary, then the following is handled by
1521 * bond_change_active_slave().
1522 */
1523 if (!bond_uses_primary(bond)) {
1524 /* set promiscuity level to new slave */
1525 if (bond_dev->flags & IFF_PROMISC) {
1526 res = dev_set_promiscuity(slave_dev, 1);
1527 if (res)
1528 goto err_close;
1529 }
1530
1531 /* set allmulti level to new slave */
1532 if (bond_dev->flags & IFF_ALLMULTI) {
1533 res = dev_set_allmulti(slave_dev, 1);
1534 if (res)
1535 goto err_close;
1536 }
1537
1538 netif_addr_lock_bh(bond_dev);
1539
1540 dev_mc_sync_multiple(slave_dev, bond_dev);
1541 dev_uc_sync_multiple(slave_dev, bond_dev);
1542
1543 netif_addr_unlock_bh(bond_dev);
1544 }
1545
1546 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1547 /* add lacpdu mc addr to mc list */
1548 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1549
1550 dev_mc_add(slave_dev, lacpdu_multicast);
1551 }
1552
1553 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1554 if (res) {
1555 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1556 slave_dev->name);
1557 goto err_close;
1558 }
1559
1560 prev_slave = bond_last_slave(bond);
1561
1562 new_slave->delay = 0;
1563 new_slave->link_failure_count = 0;
1564
1565 bond_update_speed_duplex(new_slave);
1566
1567 new_slave->last_rx = jiffies -
1568 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1569 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1570 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1571
1572 if (bond->params.miimon && !bond->params.use_carrier) {
1573 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1574
1575 if ((link_reporting == -1) && !bond->params.arp_interval) {
1576 /* miimon is set but a bonded network driver
1577 * does not support ETHTOOL/MII and
1578 * arp_interval is not set. Note: if
1579 * use_carrier is enabled, we will never go
1580 * here (because netif_carrier is always
1581 * supported); thus, we don't need to change
1582 * the messages for netif_carrier.
1583 */
1584 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",
1585 slave_dev->name);
1586 } else if (link_reporting == -1) {
1587 /* unable get link status using mii/ethtool */
1588 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",
1589 slave_dev->name);
1590 }
1591 }
1592
1593 /* check for initial state */
1594 if (bond->params.miimon) {
1595 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1596 if (bond->params.updelay) {
1597 bond_set_slave_link_state(new_slave,
1598 BOND_LINK_BACK,
1599 BOND_SLAVE_NOTIFY_NOW);
1600 new_slave->delay = bond->params.updelay;
1601 } else {
1602 bond_set_slave_link_state(new_slave,
1603 BOND_LINK_UP,
1604 BOND_SLAVE_NOTIFY_NOW);
1605 }
1606 } else {
1607 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1608 BOND_SLAVE_NOTIFY_NOW);
1609 }
1610 } else if (bond->params.arp_interval) {
1611 bond_set_slave_link_state(new_slave,
1612 (netif_carrier_ok(slave_dev) ?
1613 BOND_LINK_UP : BOND_LINK_DOWN),
1614 BOND_SLAVE_NOTIFY_NOW);
1615 } else {
1616 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1617 BOND_SLAVE_NOTIFY_NOW);
1618 }
1619
1620 if (new_slave->link != BOND_LINK_DOWN)
1621 new_slave->last_link_up = jiffies;
1622 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1623 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1624 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1625
1626 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1627 /* if there is a primary slave, remember it */
1628 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1629 rcu_assign_pointer(bond->primary_slave, new_slave);
1630 bond->force_primary = true;
1631 }
1632 }
1633
1634 switch (BOND_MODE(bond)) {
1635 case BOND_MODE_ACTIVEBACKUP:
1636 bond_set_slave_inactive_flags(new_slave,
1637 BOND_SLAVE_NOTIFY_NOW);
1638 break;
1639 case BOND_MODE_8023AD:
1640 /* in 802.3ad mode, the internal mechanism
1641 * will activate the slaves in the selected
1642 * aggregator
1643 */
1644 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1645 /* if this is the first slave */
1646 if (!prev_slave) {
1647 SLAVE_AD_INFO(new_slave)->id = 1;
1648 /* Initialize AD with the number of times that the AD timer is called in 1 second
1649 * can be called only after the mac address of the bond is set
1650 */
1651 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1652 } else {
1653 SLAVE_AD_INFO(new_slave)->id =
1654 SLAVE_AD_INFO(prev_slave)->id + 1;
1655 }
1656
1657 bond_3ad_bind_slave(new_slave);
1658 break;
1659 case BOND_MODE_TLB:
1660 case BOND_MODE_ALB:
1661 bond_set_active_slave(new_slave);
1662 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1663 break;
1664 default:
1665 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1666
1667 /* always active in trunk mode */
1668 bond_set_active_slave(new_slave);
1669
1670 /* In trunking mode there is little meaning to curr_active_slave
1671 * anyway (it holds no special properties of the bond device),
1672 * so we can change it without calling change_active_interface()
1673 */
1674 if (!rcu_access_pointer(bond->curr_active_slave) &&
1675 new_slave->link == BOND_LINK_UP)
1676 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1677
1678 break;
1679 } /* switch(bond_mode) */
1680
1681 #ifdef CONFIG_NET_POLL_CONTROLLER
1682 slave_dev->npinfo = bond->dev->npinfo;
1683 if (slave_dev->npinfo) {
1684 if (slave_enable_netpoll(new_slave)) {
1685 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1686 res = -EBUSY;
1687 goto err_detach;
1688 }
1689 }
1690 #endif
1691
1692 if (!(bond_dev->features & NETIF_F_LRO))
1693 dev_disable_lro(slave_dev);
1694
1695 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1696 new_slave);
1697 if (res) {
1698 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1699 goto err_detach;
1700 }
1701
1702 res = bond_master_upper_dev_link(bond, new_slave);
1703 if (res) {
1704 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1705 goto err_unregister;
1706 }
1707
1708 res = bond_sysfs_slave_add(new_slave);
1709 if (res) {
1710 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1711 goto err_upper_unlink;
1712 }
1713
1714 bond->slave_cnt++;
1715 bond_compute_features(bond);
1716 bond_set_carrier(bond);
1717
1718 if (bond_uses_primary(bond)) {
1719 block_netpoll_tx();
1720 bond_select_active_slave(bond);
1721 unblock_netpoll_tx();
1722 }
1723
1724 if (bond_mode_uses_xmit_hash(bond))
1725 bond_update_slave_arr(bond, NULL);
1726
1727 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1728 slave_dev->name,
1729 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1730 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1731
1732 /* enslave is successful */
1733 bond_queue_slave_event(new_slave);
1734 return 0;
1735
1736 /* Undo stages on error */
1737 err_upper_unlink:
1738 bond_upper_dev_unlink(bond, new_slave);
1739
1740 err_unregister:
1741 netdev_rx_handler_unregister(slave_dev);
1742
1743 err_detach:
1744 if (!bond_uses_primary(bond))
1745 bond_hw_addr_flush(bond_dev, slave_dev);
1746
1747 vlan_vids_del_by_dev(slave_dev, bond_dev);
1748 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1749 RCU_INIT_POINTER(bond->primary_slave, NULL);
1750 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1751 block_netpoll_tx();
1752 bond_change_active_slave(bond, NULL);
1753 bond_select_active_slave(bond);
1754 unblock_netpoll_tx();
1755 }
1756 /* either primary_slave or curr_active_slave might've changed */
1757 synchronize_rcu();
1758 slave_disable_netpoll(new_slave);
1759
1760 err_close:
1761 slave_dev->priv_flags &= ~IFF_BONDING;
1762 dev_close(slave_dev);
1763
1764 err_restore_mac:
1765 slave_dev->flags &= ~IFF_SLAVE;
1766 if (!bond->params.fail_over_mac ||
1767 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1768 /* XXX TODO - fom follow mode needs to change master's
1769 * MAC if this slave's MAC is in use by the bond, or at
1770 * least print a warning.
1771 */
1772 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1773 addr.sa_family = slave_dev->type;
1774 dev_set_mac_address(slave_dev, &addr);
1775 }
1776
1777 err_restore_mtu:
1778 dev_set_mtu(slave_dev, new_slave->original_mtu);
1779
1780 err_free:
1781 bond_free_slave(new_slave);
1782
1783 err_undo_flags:
1784 /* Enslave of first slave has failed and we need to fix master's mac */
1785 if (!bond_has_slaves(bond)) {
1786 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1787 slave_dev->dev_addr))
1788 eth_hw_addr_random(bond_dev);
1789 if (bond_dev->type != ARPHRD_ETHER) {
1790 dev_close(bond_dev);
1791 ether_setup(bond_dev);
1792 bond_dev->flags |= IFF_MASTER;
1793 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1794 }
1795 }
1796
1797 return res;
1798 }
1799
1800 /* Try to release the slave device <slave> from the bond device <master>
1801 * It is legal to access curr_active_slave without a lock because all the function
1802 * is RTNL-locked. If "all" is true it means that the function is being called
1803 * while destroying a bond interface and all slaves are being released.
1804 *
1805 * The rules for slave state should be:
1806 * for Active/Backup:
1807 * Active stays on all backups go down
1808 * for Bonded connections:
1809 * The first up interface should be left on and all others downed.
1810 */
1811 static int __bond_release_one(struct net_device *bond_dev,
1812 struct net_device *slave_dev,
1813 bool all)
1814 {
1815 struct bonding *bond = netdev_priv(bond_dev);
1816 struct slave *slave, *oldcurrent;
1817 struct sockaddr addr;
1818 int old_flags = bond_dev->flags;
1819 netdev_features_t old_features = bond_dev->features;
1820
1821 /* slave is not a slave or master is not master of this slave */
1822 if (!(slave_dev->flags & IFF_SLAVE) ||
1823 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1824 netdev_dbg(bond_dev, "cannot release %s\n",
1825 slave_dev->name);
1826 return -EINVAL;
1827 }
1828
1829 block_netpoll_tx();
1830
1831 slave = bond_get_slave_by_dev(bond, slave_dev);
1832 if (!slave) {
1833 /* not a slave of this bond */
1834 netdev_info(bond_dev, "%s not enslaved\n",
1835 slave_dev->name);
1836 unblock_netpoll_tx();
1837 return -EINVAL;
1838 }
1839
1840 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1841
1842 bond_sysfs_slave_del(slave);
1843
1844 /* recompute stats just before removing the slave */
1845 bond_get_stats(bond->dev, &bond->bond_stats);
1846
1847 bond_upper_dev_unlink(bond, slave);
1848 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1849 * for this slave anymore.
1850 */
1851 netdev_rx_handler_unregister(slave_dev);
1852
1853 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1854 bond_3ad_unbind_slave(slave);
1855
1856 if (bond_mode_uses_xmit_hash(bond))
1857 bond_update_slave_arr(bond, slave);
1858
1859 netdev_info(bond_dev, "Releasing %s interface %s\n",
1860 bond_is_active_slave(slave) ? "active" : "backup",
1861 slave_dev->name);
1862
1863 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1864
1865 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1866
1867 if (!all && (!bond->params.fail_over_mac ||
1868 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1869 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1870 bond_has_slaves(bond))
1871 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",
1872 slave_dev->name, slave->perm_hwaddr,
1873 bond_dev->name, slave_dev->name);
1874 }
1875
1876 if (rtnl_dereference(bond->primary_slave) == slave)
1877 RCU_INIT_POINTER(bond->primary_slave, NULL);
1878
1879 if (oldcurrent == slave)
1880 bond_change_active_slave(bond, NULL);
1881
1882 if (bond_is_lb(bond)) {
1883 /* Must be called only after the slave has been
1884 * detached from the list and the curr_active_slave
1885 * has been cleared (if our_slave == old_current),
1886 * but before a new active slave is selected.
1887 */
1888 bond_alb_deinit_slave(bond, slave);
1889 }
1890
1891 if (all) {
1892 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1893 } else if (oldcurrent == slave) {
1894 /* Note that we hold RTNL over this sequence, so there
1895 * is no concern that another slave add/remove event
1896 * will interfere.
1897 */
1898 bond_select_active_slave(bond);
1899 }
1900
1901 if (!bond_has_slaves(bond)) {
1902 bond_set_carrier(bond);
1903 eth_hw_addr_random(bond_dev);
1904 }
1905
1906 unblock_netpoll_tx();
1907 synchronize_rcu();
1908 bond->slave_cnt--;
1909
1910 if (!bond_has_slaves(bond)) {
1911 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1912 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1913 }
1914
1915 bond_compute_features(bond);
1916 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1917 (old_features & NETIF_F_VLAN_CHALLENGED))
1918 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1919 slave_dev->name, bond_dev->name);
1920
1921 vlan_vids_del_by_dev(slave_dev, bond_dev);
1922
1923 /* If the mode uses primary, then this case was handled above by
1924 * bond_change_active_slave(..., NULL)
1925 */
1926 if (!bond_uses_primary(bond)) {
1927 /* unset promiscuity level from slave
1928 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1929 * of the IFF_PROMISC flag in the bond_dev, but we need the
1930 * value of that flag before that change, as that was the value
1931 * when this slave was attached, so we cache at the start of the
1932 * function and use it here. Same goes for ALLMULTI below
1933 */
1934 if (old_flags & IFF_PROMISC)
1935 dev_set_promiscuity(slave_dev, -1);
1936
1937 /* unset allmulti level from slave */
1938 if (old_flags & IFF_ALLMULTI)
1939 dev_set_allmulti(slave_dev, -1);
1940
1941 bond_hw_addr_flush(bond_dev, slave_dev);
1942 }
1943
1944 slave_disable_netpoll(slave);
1945
1946 /* close slave before restoring its mac address */
1947 dev_close(slave_dev);
1948
1949 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1950 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1951 /* restore original ("permanent") mac address */
1952 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1953 addr.sa_family = slave_dev->type;
1954 dev_set_mac_address(slave_dev, &addr);
1955 }
1956
1957 dev_set_mtu(slave_dev, slave->original_mtu);
1958
1959 slave_dev->priv_flags &= ~IFF_BONDING;
1960
1961 bond_free_slave(slave);
1962
1963 return 0;
1964 }
1965
1966 /* A wrapper used because of ndo_del_link */
1967 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1968 {
1969 return __bond_release_one(bond_dev, slave_dev, false);
1970 }
1971
1972 /* First release a slave and then destroy the bond if no more slaves are left.
1973 * Must be under rtnl_lock when this function is called.
1974 */
1975 static int bond_release_and_destroy(struct net_device *bond_dev,
1976 struct net_device *slave_dev)
1977 {
1978 struct bonding *bond = netdev_priv(bond_dev);
1979 int ret;
1980
1981 ret = bond_release(bond_dev, slave_dev);
1982 if (ret == 0 && !bond_has_slaves(bond)) {
1983 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1984 netdev_info(bond_dev, "Destroying bond %s\n",
1985 bond_dev->name);
1986 bond_remove_proc_entry(bond);
1987 unregister_netdevice(bond_dev);
1988 }
1989 return ret;
1990 }
1991
1992 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1993 {
1994 struct bonding *bond = netdev_priv(bond_dev);
1995 bond_fill_ifbond(bond, info);
1996 return 0;
1997 }
1998
1999 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2000 {
2001 struct bonding *bond = netdev_priv(bond_dev);
2002 struct list_head *iter;
2003 int i = 0, res = -ENODEV;
2004 struct slave *slave;
2005
2006 bond_for_each_slave(bond, slave, iter) {
2007 if (i++ == (int)info->slave_id) {
2008 res = 0;
2009 bond_fill_ifslave(slave, info);
2010 break;
2011 }
2012 }
2013
2014 return res;
2015 }
2016
2017 /*-------------------------------- Monitoring -------------------------------*/
2018
2019 /* called with rcu_read_lock() */
2020 static int bond_miimon_inspect(struct bonding *bond)
2021 {
2022 int link_state, commit = 0;
2023 struct list_head *iter;
2024 struct slave *slave;
2025 bool ignore_updelay;
2026
2027 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2028
2029 bond_for_each_slave_rcu(bond, slave, iter) {
2030 slave->new_link = BOND_LINK_NOCHANGE;
2031
2032 link_state = bond_check_dev_link(bond, slave->dev, 0);
2033
2034 switch (slave->link) {
2035 case BOND_LINK_UP:
2036 if (link_state)
2037 continue;
2038
2039 bond_set_slave_link_state(slave, BOND_LINK_FAIL,
2040 BOND_SLAVE_NOTIFY_LATER);
2041 slave->delay = bond->params.downdelay;
2042 if (slave->delay) {
2043 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2044 (BOND_MODE(bond) ==
2045 BOND_MODE_ACTIVEBACKUP) ?
2046 (bond_is_active_slave(slave) ?
2047 "active " : "backup ") : "",
2048 slave->dev->name,
2049 bond->params.downdelay * bond->params.miimon);
2050 }
2051 /*FALLTHRU*/
2052 case BOND_LINK_FAIL:
2053 if (link_state) {
2054 /* recovered before downdelay expired */
2055 bond_set_slave_link_state(slave, BOND_LINK_UP,
2056 BOND_SLAVE_NOTIFY_LATER);
2057 slave->last_link_up = jiffies;
2058 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2059 (bond->params.downdelay - slave->delay) *
2060 bond->params.miimon,
2061 slave->dev->name);
2062 continue;
2063 }
2064
2065 if (slave->delay <= 0) {
2066 slave->new_link = BOND_LINK_DOWN;
2067 commit++;
2068 continue;
2069 }
2070
2071 slave->delay--;
2072 break;
2073
2074 case BOND_LINK_DOWN:
2075 if (!link_state)
2076 continue;
2077
2078 bond_set_slave_link_state(slave, BOND_LINK_BACK,
2079 BOND_SLAVE_NOTIFY_LATER);
2080 slave->delay = bond->params.updelay;
2081
2082 if (slave->delay) {
2083 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2084 slave->dev->name,
2085 ignore_updelay ? 0 :
2086 bond->params.updelay *
2087 bond->params.miimon);
2088 }
2089 /*FALLTHRU*/
2090 case BOND_LINK_BACK:
2091 if (!link_state) {
2092 bond_set_slave_link_state(slave,
2093 BOND_LINK_DOWN,
2094 BOND_SLAVE_NOTIFY_LATER);
2095 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2096 (bond->params.updelay - slave->delay) *
2097 bond->params.miimon,
2098 slave->dev->name);
2099
2100 continue;
2101 }
2102
2103 if (ignore_updelay)
2104 slave->delay = 0;
2105
2106 if (slave->delay <= 0) {
2107 slave->new_link = BOND_LINK_UP;
2108 commit++;
2109 ignore_updelay = false;
2110 continue;
2111 }
2112
2113 slave->delay--;
2114 break;
2115 }
2116 }
2117
2118 return commit;
2119 }
2120
2121 static void bond_miimon_commit(struct bonding *bond)
2122 {
2123 struct list_head *iter;
2124 struct slave *slave, *primary;
2125
2126 bond_for_each_slave(bond, slave, iter) {
2127 switch (slave->new_link) {
2128 case BOND_LINK_NOCHANGE:
2129 continue;
2130
2131 case BOND_LINK_UP:
2132 bond_update_speed_duplex(slave);
2133 bond_set_slave_link_state(slave, BOND_LINK_UP,
2134 BOND_SLAVE_NOTIFY_NOW);
2135 slave->last_link_up = jiffies;
2136
2137 primary = rtnl_dereference(bond->primary_slave);
2138 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2139 /* prevent it from being the active one */
2140 bond_set_backup_slave(slave);
2141 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2142 /* make it immediately active */
2143 bond_set_active_slave(slave);
2144 } else if (slave != primary) {
2145 /* prevent it from being the active one */
2146 bond_set_backup_slave(slave);
2147 }
2148
2149 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2150 slave->dev->name,
2151 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2152 slave->duplex ? "full" : "half");
2153
2154 /* notify ad that the link status has changed */
2155 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2156 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2157
2158 if (bond_is_lb(bond))
2159 bond_alb_handle_link_change(bond, slave,
2160 BOND_LINK_UP);
2161
2162 if (BOND_MODE(bond) == BOND_MODE_XOR)
2163 bond_update_slave_arr(bond, NULL);
2164
2165 if (!bond->curr_active_slave || slave == primary)
2166 goto do_failover;
2167
2168 continue;
2169
2170 case BOND_LINK_DOWN:
2171 if (slave->link_failure_count < UINT_MAX)
2172 slave->link_failure_count++;
2173
2174 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2175 BOND_SLAVE_NOTIFY_NOW);
2176
2177 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2178 BOND_MODE(bond) == BOND_MODE_8023AD)
2179 bond_set_slave_inactive_flags(slave,
2180 BOND_SLAVE_NOTIFY_NOW);
2181
2182 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2183 slave->dev->name);
2184
2185 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2186 bond_3ad_handle_link_change(slave,
2187 BOND_LINK_DOWN);
2188
2189 if (bond_is_lb(bond))
2190 bond_alb_handle_link_change(bond, slave,
2191 BOND_LINK_DOWN);
2192
2193 if (BOND_MODE(bond) == BOND_MODE_XOR)
2194 bond_update_slave_arr(bond, NULL);
2195
2196 if (slave == rcu_access_pointer(bond->curr_active_slave))
2197 goto do_failover;
2198
2199 continue;
2200
2201 default:
2202 netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2203 slave->new_link, slave->dev->name);
2204 slave->new_link = BOND_LINK_NOCHANGE;
2205
2206 continue;
2207 }
2208
2209 do_failover:
2210 block_netpoll_tx();
2211 bond_select_active_slave(bond);
2212 unblock_netpoll_tx();
2213 }
2214
2215 bond_set_carrier(bond);
2216 }
2217
2218 /* bond_mii_monitor
2219 *
2220 * Really a wrapper that splits the mii monitor into two phases: an
2221 * inspection, then (if inspection indicates something needs to be done)
2222 * an acquisition of appropriate locks followed by a commit phase to
2223 * implement whatever link state changes are indicated.
2224 */
2225 static void bond_mii_monitor(struct work_struct *work)
2226 {
2227 struct bonding *bond = container_of(work, struct bonding,
2228 mii_work.work);
2229 bool should_notify_peers = false;
2230 unsigned long delay;
2231
2232 delay = msecs_to_jiffies(bond->params.miimon);
2233
2234 if (!bond_has_slaves(bond))
2235 goto re_arm;
2236
2237 rcu_read_lock();
2238
2239 should_notify_peers = bond_should_notify_peers(bond);
2240
2241 if (bond_miimon_inspect(bond)) {
2242 rcu_read_unlock();
2243
2244 /* Race avoidance with bond_close cancel of workqueue */
2245 if (!rtnl_trylock()) {
2246 delay = 1;
2247 should_notify_peers = false;
2248 goto re_arm;
2249 }
2250
2251 bond_miimon_commit(bond);
2252
2253 rtnl_unlock(); /* might sleep, hold no other locks */
2254 } else
2255 rcu_read_unlock();
2256
2257 re_arm:
2258 if (bond->params.miimon)
2259 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2260
2261 if (should_notify_peers) {
2262 if (!rtnl_trylock())
2263 return;
2264 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2265 rtnl_unlock();
2266 }
2267 }
2268
2269 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2270 {
2271 struct net_device *upper;
2272 struct list_head *iter;
2273 bool ret = false;
2274
2275 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2276 return true;
2277
2278 rcu_read_lock();
2279 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2280 if (ip == bond_confirm_addr(upper, 0, ip)) {
2281 ret = true;
2282 break;
2283 }
2284 }
2285 rcu_read_unlock();
2286
2287 return ret;
2288 }
2289
2290 /* We go to the (large) trouble of VLAN tagging ARP frames because
2291 * switches in VLAN mode (especially if ports are configured as
2292 * "native" to a VLAN) might not pass non-tagged frames.
2293 */
2294 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2295 __be32 dest_ip, __be32 src_ip,
2296 struct bond_vlan_tag *tags)
2297 {
2298 struct sk_buff *skb;
2299 struct bond_vlan_tag *outer_tag = tags;
2300
2301 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2302 arp_op, slave_dev->name, &dest_ip, &src_ip);
2303
2304 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2305 NULL, slave_dev->dev_addr, NULL);
2306
2307 if (!skb) {
2308 net_err_ratelimited("ARP packet allocation failed\n");
2309 return;
2310 }
2311
2312 if (!tags || tags->vlan_proto == VLAN_N_VID)
2313 goto xmit;
2314
2315 tags++;
2316
2317 /* Go through all the tags backwards and add them to the packet */
2318 while (tags->vlan_proto != VLAN_N_VID) {
2319 if (!tags->vlan_id) {
2320 tags++;
2321 continue;
2322 }
2323
2324 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2325 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2326 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2327 tags->vlan_id);
2328 if (!skb) {
2329 net_err_ratelimited("failed to insert inner VLAN tag\n");
2330 return;
2331 }
2332
2333 tags++;
2334 }
2335 /* Set the outer tag */
2336 if (outer_tag->vlan_id) {
2337 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2338 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2339 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2340 outer_tag->vlan_id);
2341 }
2342
2343 xmit:
2344 arp_xmit(skb);
2345 }
2346
2347 /* Validate the device path between the @start_dev and the @end_dev.
2348 * The path is valid if the @end_dev is reachable through device
2349 * stacking.
2350 * When the path is validated, collect any vlan information in the
2351 * path.
2352 */
2353 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2354 struct net_device *end_dev,
2355 int level)
2356 {
2357 struct bond_vlan_tag *tags;
2358 struct net_device *upper;
2359 struct list_head *iter;
2360
2361 if (start_dev == end_dev) {
2362 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2363 if (!tags)
2364 return ERR_PTR(-ENOMEM);
2365 tags[level].vlan_proto = VLAN_N_VID;
2366 return tags;
2367 }
2368
2369 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2370 tags = bond_verify_device_path(upper, end_dev, level + 1);
2371 if (IS_ERR_OR_NULL(tags)) {
2372 if (IS_ERR(tags))
2373 return tags;
2374 continue;
2375 }
2376 if (is_vlan_dev(upper)) {
2377 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2378 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2379 }
2380
2381 return tags;
2382 }
2383
2384 return NULL;
2385 }
2386
2387 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2388 {
2389 struct rtable *rt;
2390 struct bond_vlan_tag *tags;
2391 __be32 *targets = bond->params.arp_targets, addr;
2392 int i;
2393
2394 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2395 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2396 tags = NULL;
2397
2398 /* Find out through which dev should the packet go */
2399 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2400 RTO_ONLINK, 0);
2401 if (IS_ERR(rt)) {
2402 /* there's no route to target - try to send arp
2403 * probe to generate any traffic (arp_validate=0)
2404 */
2405 if (bond->params.arp_validate)
2406 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2407 bond->dev->name,
2408 &targets[i]);
2409 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2410 0, tags);
2411 continue;
2412 }
2413
2414 /* bond device itself */
2415 if (rt->dst.dev == bond->dev)
2416 goto found;
2417
2418 rcu_read_lock();
2419 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2420 rcu_read_unlock();
2421
2422 if (!IS_ERR_OR_NULL(tags))
2423 goto found;
2424
2425 /* Not our device - skip */
2426 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2427 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2428
2429 ip_rt_put(rt);
2430 continue;
2431
2432 found:
2433 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2434 ip_rt_put(rt);
2435 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2436 addr, tags);
2437 kfree(tags);
2438 }
2439 }
2440
2441 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2442 {
2443 int i;
2444
2445 if (!sip || !bond_has_this_ip(bond, tip)) {
2446 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2447 &sip, &tip);
2448 return;
2449 }
2450
2451 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2452 if (i == -1) {
2453 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2454 &sip);
2455 return;
2456 }
2457 slave->last_rx = jiffies;
2458 slave->target_last_arp_rx[i] = jiffies;
2459 }
2460
2461 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2462 struct slave *slave)
2463 {
2464 struct arphdr *arp = (struct arphdr *)skb->data;
2465 struct slave *curr_active_slave, *curr_arp_slave;
2466 unsigned char *arp_ptr;
2467 __be32 sip, tip;
2468 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2469
2470 if (!slave_do_arp_validate(bond, slave)) {
2471 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2472 !slave_do_arp_validate_only(bond))
2473 slave->last_rx = jiffies;
2474 return RX_HANDLER_ANOTHER;
2475 } else if (!is_arp) {
2476 return RX_HANDLER_ANOTHER;
2477 }
2478
2479 alen = arp_hdr_len(bond->dev);
2480
2481 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2482 skb->dev->name);
2483
2484 if (alen > skb_headlen(skb)) {
2485 arp = kmalloc(alen, GFP_ATOMIC);
2486 if (!arp)
2487 goto out_unlock;
2488 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2489 goto out_unlock;
2490 }
2491
2492 if (arp->ar_hln != bond->dev->addr_len ||
2493 skb->pkt_type == PACKET_OTHERHOST ||
2494 skb->pkt_type == PACKET_LOOPBACK ||
2495 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2496 arp->ar_pro != htons(ETH_P_IP) ||
2497 arp->ar_pln != 4)
2498 goto out_unlock;
2499
2500 arp_ptr = (unsigned char *)(arp + 1);
2501 arp_ptr += bond->dev->addr_len;
2502 memcpy(&sip, arp_ptr, 4);
2503 arp_ptr += 4 + bond->dev->addr_len;
2504 memcpy(&tip, arp_ptr, 4);
2505
2506 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2507 slave->dev->name, bond_slave_state(slave),
2508 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2509 &sip, &tip);
2510
2511 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2512 curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2513
2514 /* We 'trust' the received ARP enough to validate it if:
2515 *
2516 * (a) the slave receiving the ARP is active (which includes the
2517 * current ARP slave, if any), or
2518 *
2519 * (b) the receiving slave isn't active, but there is a currently
2520 * active slave and it received valid arp reply(s) after it became
2521 * the currently active slave, or
2522 *
2523 * (c) there is an ARP slave that sent an ARP during the prior ARP
2524 * interval, and we receive an ARP reply on any slave. We accept
2525 * these because switch FDB update delays may deliver the ARP
2526 * reply to a slave other than the sender of the ARP request.
2527 *
2528 * Note: for (b), backup slaves are receiving the broadcast ARP
2529 * request, not a reply. This request passes from the sending
2530 * slave through the L2 switch(es) to the receiving slave. Since
2531 * this is checking the request, sip/tip are swapped for
2532 * validation.
2533 *
2534 * This is done to avoid endless looping when we can't reach the
2535 * arp_ip_target and fool ourselves with our own arp requests.
2536 */
2537 if (bond_is_active_slave(slave))
2538 bond_validate_arp(bond, slave, sip, tip);
2539 else if (curr_active_slave &&
2540 time_after(slave_last_rx(bond, curr_active_slave),
2541 curr_active_slave->last_link_up))
2542 bond_validate_arp(bond, slave, tip, sip);
2543 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2544 bond_time_in_interval(bond,
2545 dev_trans_start(curr_arp_slave->dev), 1))
2546 bond_validate_arp(bond, slave, sip, tip);
2547
2548 out_unlock:
2549 if (arp != (struct arphdr *)skb->data)
2550 kfree(arp);
2551 return RX_HANDLER_ANOTHER;
2552 }
2553
2554 /* function to verify if we're in the arp_interval timeslice, returns true if
2555 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2556 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2557 */
2558 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2559 int mod)
2560 {
2561 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2562
2563 return time_in_range(jiffies,
2564 last_act - delta_in_ticks,
2565 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2566 }
2567
2568 /* This function is called regularly to monitor each slave's link
2569 * ensuring that traffic is being sent and received when arp monitoring
2570 * is used in load-balancing mode. if the adapter has been dormant, then an
2571 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2572 * arp monitoring in active backup mode.
2573 */
2574 static void bond_loadbalance_arp_mon(struct work_struct *work)
2575 {
2576 struct bonding *bond = container_of(work, struct bonding,
2577 arp_work.work);
2578 struct slave *slave, *oldcurrent;
2579 struct list_head *iter;
2580 int do_failover = 0, slave_state_changed = 0;
2581
2582 if (!bond_has_slaves(bond))
2583 goto re_arm;
2584
2585 rcu_read_lock();
2586
2587 oldcurrent = rcu_dereference(bond->curr_active_slave);
2588 /* see if any of the previous devices are up now (i.e. they have
2589 * xmt and rcv traffic). the curr_active_slave does not come into
2590 * the picture unless it is null. also, slave->last_link_up is not
2591 * needed here because we send an arp on each slave and give a slave
2592 * as long as it needs to get the tx/rx within the delta.
2593 * TODO: what about up/down delay in arp mode? it wasn't here before
2594 * so it can wait
2595 */
2596 bond_for_each_slave_rcu(bond, slave, iter) {
2597 unsigned long trans_start = dev_trans_start(slave->dev);
2598
2599 if (slave->link != BOND_LINK_UP) {
2600 if (bond_time_in_interval(bond, trans_start, 1) &&
2601 bond_time_in_interval(bond, slave->last_rx, 1)) {
2602
2603 slave->link = BOND_LINK_UP;
2604 slave_state_changed = 1;
2605
2606 /* primary_slave has no meaning in round-robin
2607 * mode. the window of a slave being up and
2608 * curr_active_slave being null after enslaving
2609 * is closed.
2610 */
2611 if (!oldcurrent) {
2612 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2613 slave->dev->name);
2614 do_failover = 1;
2615 } else {
2616 netdev_info(bond->dev, "interface %s is now up\n",
2617 slave->dev->name);
2618 }
2619 }
2620 } else {
2621 /* slave->link == BOND_LINK_UP */
2622
2623 /* not all switches will respond to an arp request
2624 * when the source ip is 0, so don't take the link down
2625 * if we don't know our ip yet
2626 */
2627 if (!bond_time_in_interval(bond, trans_start, 2) ||
2628 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2629
2630 slave->link = BOND_LINK_DOWN;
2631 slave_state_changed = 1;
2632
2633 if (slave->link_failure_count < UINT_MAX)
2634 slave->link_failure_count++;
2635
2636 netdev_info(bond->dev, "interface %s is now down\n",
2637 slave->dev->name);
2638
2639 if (slave == oldcurrent)
2640 do_failover = 1;
2641 }
2642 }
2643
2644 /* note: if switch is in round-robin mode, all links
2645 * must tx arp to ensure all links rx an arp - otherwise
2646 * links may oscillate or not come up at all; if switch is
2647 * in something like xor mode, there is nothing we can
2648 * do - all replies will be rx'ed on same link causing slaves
2649 * to be unstable during low/no traffic periods
2650 */
2651 if (bond_slave_is_up(slave))
2652 bond_arp_send_all(bond, slave);
2653 }
2654
2655 rcu_read_unlock();
2656
2657 if (do_failover || slave_state_changed) {
2658 if (!rtnl_trylock())
2659 goto re_arm;
2660
2661 if (slave_state_changed) {
2662 bond_slave_state_change(bond);
2663 if (BOND_MODE(bond) == BOND_MODE_XOR)
2664 bond_update_slave_arr(bond, NULL);
2665 }
2666 if (do_failover) {
2667 block_netpoll_tx();
2668 bond_select_active_slave(bond);
2669 unblock_netpoll_tx();
2670 }
2671 rtnl_unlock();
2672 }
2673
2674 re_arm:
2675 if (bond->params.arp_interval)
2676 queue_delayed_work(bond->wq, &bond->arp_work,
2677 msecs_to_jiffies(bond->params.arp_interval));
2678 }
2679
2680 /* Called to inspect slaves for active-backup mode ARP monitor link state
2681 * changes. Sets new_link in slaves to specify what action should take
2682 * place for the slave. Returns 0 if no changes are found, >0 if changes
2683 * to link states must be committed.
2684 *
2685 * Called with rcu_read_lock held.
2686 */
2687 static int bond_ab_arp_inspect(struct bonding *bond)
2688 {
2689 unsigned long trans_start, last_rx;
2690 struct list_head *iter;
2691 struct slave *slave;
2692 int commit = 0;
2693
2694 bond_for_each_slave_rcu(bond, slave, iter) {
2695 slave->new_link = BOND_LINK_NOCHANGE;
2696 last_rx = slave_last_rx(bond, slave);
2697
2698 if (slave->link != BOND_LINK_UP) {
2699 if (bond_time_in_interval(bond, last_rx, 1)) {
2700 slave->new_link = BOND_LINK_UP;
2701 commit++;
2702 }
2703 continue;
2704 }
2705
2706 /* Give slaves 2*delta after being enslaved or made
2707 * active. This avoids bouncing, as the last receive
2708 * times need a full ARP monitor cycle to be updated.
2709 */
2710 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2711 continue;
2712
2713 /* Backup slave is down if:
2714 * - No current_arp_slave AND
2715 * - more than 3*delta since last receive AND
2716 * - the bond has an IP address
2717 *
2718 * Note: a non-null current_arp_slave indicates
2719 * the curr_active_slave went down and we are
2720 * searching for a new one; under this condition
2721 * we only take the curr_active_slave down - this
2722 * gives each slave a chance to tx/rx traffic
2723 * before being taken out
2724 */
2725 if (!bond_is_active_slave(slave) &&
2726 !rcu_access_pointer(bond->current_arp_slave) &&
2727 !bond_time_in_interval(bond, last_rx, 3)) {
2728 slave->new_link = BOND_LINK_DOWN;
2729 commit++;
2730 }
2731
2732 /* Active slave is down if:
2733 * - more than 2*delta since transmitting OR
2734 * - (more than 2*delta since receive AND
2735 * the bond has an IP address)
2736 */
2737 trans_start = dev_trans_start(slave->dev);
2738 if (bond_is_active_slave(slave) &&
2739 (!bond_time_in_interval(bond, trans_start, 2) ||
2740 !bond_time_in_interval(bond, last_rx, 2))) {
2741 slave->new_link = BOND_LINK_DOWN;
2742 commit++;
2743 }
2744 }
2745
2746 return commit;
2747 }
2748
2749 /* Called to commit link state changes noted by inspection step of
2750 * active-backup mode ARP monitor.
2751 *
2752 * Called with RTNL hold.
2753 */
2754 static void bond_ab_arp_commit(struct bonding *bond)
2755 {
2756 unsigned long trans_start;
2757 struct list_head *iter;
2758 struct slave *slave;
2759
2760 bond_for_each_slave(bond, slave, iter) {
2761 switch (slave->new_link) {
2762 case BOND_LINK_NOCHANGE:
2763 continue;
2764
2765 case BOND_LINK_UP:
2766 trans_start = dev_trans_start(slave->dev);
2767 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2768 (!rtnl_dereference(bond->curr_active_slave) &&
2769 bond_time_in_interval(bond, trans_start, 1))) {
2770 struct slave *current_arp_slave;
2771
2772 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2773 bond_set_slave_link_state(slave, BOND_LINK_UP,
2774 BOND_SLAVE_NOTIFY_NOW);
2775 if (current_arp_slave) {
2776 bond_set_slave_inactive_flags(
2777 current_arp_slave,
2778 BOND_SLAVE_NOTIFY_NOW);
2779 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2780 }
2781
2782 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2783 slave->dev->name);
2784
2785 if (!rtnl_dereference(bond->curr_active_slave) ||
2786 slave == rtnl_dereference(bond->primary_slave))
2787 goto do_failover;
2788
2789 }
2790
2791 continue;
2792
2793 case BOND_LINK_DOWN:
2794 if (slave->link_failure_count < UINT_MAX)
2795 slave->link_failure_count++;
2796
2797 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2798 BOND_SLAVE_NOTIFY_NOW);
2799 bond_set_slave_inactive_flags(slave,
2800 BOND_SLAVE_NOTIFY_NOW);
2801
2802 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2803 slave->dev->name);
2804
2805 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2806 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2807 goto do_failover;
2808 }
2809
2810 continue;
2811
2812 default:
2813 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2814 slave->new_link, slave->dev->name);
2815 continue;
2816 }
2817
2818 do_failover:
2819 block_netpoll_tx();
2820 bond_select_active_slave(bond);
2821 unblock_netpoll_tx();
2822 }
2823
2824 bond_set_carrier(bond);
2825 }
2826
2827 /* Send ARP probes for active-backup mode ARP monitor.
2828 *
2829 * Called with rcu_read_lock held.
2830 */
2831 static bool bond_ab_arp_probe(struct bonding *bond)
2832 {
2833 struct slave *slave, *before = NULL, *new_slave = NULL,
2834 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2835 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2836 struct list_head *iter;
2837 bool found = false;
2838 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2839
2840 if (curr_arp_slave && curr_active_slave)
2841 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2842 curr_arp_slave->dev->name,
2843 curr_active_slave->dev->name);
2844
2845 if (curr_active_slave) {
2846 bond_arp_send_all(bond, curr_active_slave);
2847 return should_notify_rtnl;
2848 }
2849
2850 /* if we don't have a curr_active_slave, search for the next available
2851 * backup slave from the current_arp_slave and make it the candidate
2852 * for becoming the curr_active_slave
2853 */
2854
2855 if (!curr_arp_slave) {
2856 curr_arp_slave = bond_first_slave_rcu(bond);
2857 if (!curr_arp_slave)
2858 return should_notify_rtnl;
2859 }
2860
2861 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2862
2863 bond_for_each_slave_rcu(bond, slave, iter) {
2864 if (!found && !before && bond_slave_is_up(slave))
2865 before = slave;
2866
2867 if (found && !new_slave && bond_slave_is_up(slave))
2868 new_slave = slave;
2869 /* if the link state is up at this point, we
2870 * mark it down - this can happen if we have
2871 * simultaneous link failures and
2872 * reselect_active_interface doesn't make this
2873 * one the current slave so it is still marked
2874 * up when it is actually down
2875 */
2876 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2877 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2878 BOND_SLAVE_NOTIFY_LATER);
2879 if (slave->link_failure_count < UINT_MAX)
2880 slave->link_failure_count++;
2881
2882 bond_set_slave_inactive_flags(slave,
2883 BOND_SLAVE_NOTIFY_LATER);
2884
2885 netdev_info(bond->dev, "backup interface %s is now down\n",
2886 slave->dev->name);
2887 }
2888 if (slave == curr_arp_slave)
2889 found = true;
2890 }
2891
2892 if (!new_slave && before)
2893 new_slave = before;
2894
2895 if (!new_slave)
2896 goto check_state;
2897
2898 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2899 BOND_SLAVE_NOTIFY_LATER);
2900 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2901 bond_arp_send_all(bond, new_slave);
2902 new_slave->last_link_up = jiffies;
2903 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2904
2905 check_state:
2906 bond_for_each_slave_rcu(bond, slave, iter) {
2907 if (slave->should_notify || slave->should_notify_link) {
2908 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2909 break;
2910 }
2911 }
2912 return should_notify_rtnl;
2913 }
2914
2915 static void bond_activebackup_arp_mon(struct work_struct *work)
2916 {
2917 struct bonding *bond = container_of(work, struct bonding,
2918 arp_work.work);
2919 bool should_notify_peers = false;
2920 bool should_notify_rtnl = false;
2921 int delta_in_ticks;
2922
2923 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2924
2925 if (!bond_has_slaves(bond))
2926 goto re_arm;
2927
2928 rcu_read_lock();
2929
2930 should_notify_peers = bond_should_notify_peers(bond);
2931
2932 if (bond_ab_arp_inspect(bond)) {
2933 rcu_read_unlock();
2934
2935 /* Race avoidance with bond_close flush of workqueue */
2936 if (!rtnl_trylock()) {
2937 delta_in_ticks = 1;
2938 should_notify_peers = false;
2939 goto re_arm;
2940 }
2941
2942 bond_ab_arp_commit(bond);
2943
2944 rtnl_unlock();
2945 rcu_read_lock();
2946 }
2947
2948 should_notify_rtnl = bond_ab_arp_probe(bond);
2949 rcu_read_unlock();
2950
2951 re_arm:
2952 if (bond->params.arp_interval)
2953 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2954
2955 if (should_notify_peers || should_notify_rtnl) {
2956 if (!rtnl_trylock())
2957 return;
2958
2959 if (should_notify_peers)
2960 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2961 bond->dev);
2962 if (should_notify_rtnl) {
2963 bond_slave_state_notify(bond);
2964 bond_slave_link_notify(bond);
2965 }
2966
2967 rtnl_unlock();
2968 }
2969 }
2970
2971 /*-------------------------- netdev event handling --------------------------*/
2972
2973 /* Change device name */
2974 static int bond_event_changename(struct bonding *bond)
2975 {
2976 bond_remove_proc_entry(bond);
2977 bond_create_proc_entry(bond);
2978
2979 bond_debug_reregister(bond);
2980
2981 return NOTIFY_DONE;
2982 }
2983
2984 static int bond_master_netdev_event(unsigned long event,
2985 struct net_device *bond_dev)
2986 {
2987 struct bonding *event_bond = netdev_priv(bond_dev);
2988
2989 switch (event) {
2990 case NETDEV_CHANGENAME:
2991 return bond_event_changename(event_bond);
2992 case NETDEV_UNREGISTER:
2993 bond_remove_proc_entry(event_bond);
2994 break;
2995 case NETDEV_REGISTER:
2996 bond_create_proc_entry(event_bond);
2997 break;
2998 case NETDEV_NOTIFY_PEERS:
2999 if (event_bond->send_peer_notif)
3000 event_bond->send_peer_notif--;
3001 break;
3002 default:
3003 break;
3004 }
3005
3006 return NOTIFY_DONE;
3007 }
3008
3009 static int bond_slave_netdev_event(unsigned long event,
3010 struct net_device *slave_dev)
3011 {
3012 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3013 struct bonding *bond;
3014 struct net_device *bond_dev;
3015
3016 /* A netdev event can be generated while enslaving a device
3017 * before netdev_rx_handler_register is called in which case
3018 * slave will be NULL
3019 */
3020 if (!slave)
3021 return NOTIFY_DONE;
3022 bond_dev = slave->bond->dev;
3023 bond = slave->bond;
3024 primary = rtnl_dereference(bond->primary_slave);
3025
3026 switch (event) {
3027 case NETDEV_UNREGISTER:
3028 if (bond_dev->type != ARPHRD_ETHER)
3029 bond_release_and_destroy(bond_dev, slave_dev);
3030 else
3031 bond_release(bond_dev, slave_dev);
3032 break;
3033 case NETDEV_UP:
3034 case NETDEV_CHANGE:
3035 bond_update_speed_duplex(slave);
3036 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3037 bond_3ad_adapter_speed_duplex_changed(slave);
3038 /* Fallthrough */
3039 case NETDEV_DOWN:
3040 /* Refresh slave-array if applicable!
3041 * If the setup does not use miimon or arpmon (mode-specific!),
3042 * then these events will not cause the slave-array to be
3043 * refreshed. This will cause xmit to use a slave that is not
3044 * usable. Avoid such situation by refeshing the array at these
3045 * events. If these (miimon/arpmon) parameters are configured
3046 * then array gets refreshed twice and that should be fine!
3047 */
3048 if (bond_mode_uses_xmit_hash(bond))
3049 bond_update_slave_arr(bond, NULL);
3050 break;
3051 case NETDEV_CHANGEMTU:
3052 /* TODO: Should slaves be allowed to
3053 * independently alter their MTU? For
3054 * an active-backup bond, slaves need
3055 * not be the same type of device, so
3056 * MTUs may vary. For other modes,
3057 * slaves arguably should have the
3058 * same MTUs. To do this, we'd need to
3059 * take over the slave's change_mtu
3060 * function for the duration of their
3061 * servitude.
3062 */
3063 break;
3064 case NETDEV_CHANGENAME:
3065 /* we don't care if we don't have primary set */
3066 if (!bond_uses_primary(bond) ||
3067 !bond->params.primary[0])
3068 break;
3069
3070 if (slave == primary) {
3071 /* slave's name changed - he's no longer primary */
3072 RCU_INIT_POINTER(bond->primary_slave, NULL);
3073 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3074 /* we have a new primary slave */
3075 rcu_assign_pointer(bond->primary_slave, slave);
3076 } else { /* we didn't change primary - exit */
3077 break;
3078 }
3079
3080 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3081 primary ? slave_dev->name : "none");
3082
3083 block_netpoll_tx();
3084 bond_select_active_slave(bond);
3085 unblock_netpoll_tx();
3086 break;
3087 case NETDEV_FEAT_CHANGE:
3088 bond_compute_features(bond);
3089 break;
3090 case NETDEV_RESEND_IGMP:
3091 /* Propagate to master device */
3092 call_netdevice_notifiers(event, slave->bond->dev);
3093 break;
3094 default:
3095 break;
3096 }
3097
3098 return NOTIFY_DONE;
3099 }
3100
3101 /* bond_netdev_event: handle netdev notifier chain events.
3102 *
3103 * This function receives events for the netdev chain. The caller (an
3104 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3105 * locks for us to safely manipulate the slave devices (RTNL lock,
3106 * dev_probe_lock).
3107 */
3108 static int bond_netdev_event(struct notifier_block *this,
3109 unsigned long event, void *ptr)
3110 {
3111 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3112
3113 netdev_dbg(event_dev, "event: %lx\n", event);
3114
3115 if (!(event_dev->priv_flags & IFF_BONDING))
3116 return NOTIFY_DONE;
3117
3118 if (event_dev->flags & IFF_MASTER) {
3119 netdev_dbg(event_dev, "IFF_MASTER\n");
3120 return bond_master_netdev_event(event, event_dev);
3121 }
3122
3123 if (event_dev->flags & IFF_SLAVE) {
3124 netdev_dbg(event_dev, "IFF_SLAVE\n");
3125 return bond_slave_netdev_event(event, event_dev);
3126 }
3127
3128 return NOTIFY_DONE;
3129 }
3130
3131 static struct notifier_block bond_netdev_notifier = {
3132 .notifier_call = bond_netdev_event,
3133 };
3134
3135 /*---------------------------- Hashing Policies -----------------------------*/
3136
3137 /* L2 hash helper */
3138 static inline u32 bond_eth_hash(struct sk_buff *skb)
3139 {
3140 struct ethhdr *ep, hdr_tmp;
3141
3142 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3143 if (ep)
3144 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3145 return 0;
3146 }
3147
3148 /* Extract the appropriate headers based on bond's xmit policy */
3149 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3150 struct flow_keys *fk)
3151 {
3152 const struct ipv6hdr *iph6;
3153 const struct iphdr *iph;
3154 int noff, proto = -1;
3155
3156 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3157 return skb_flow_dissect_flow_keys(skb, fk, 0);
3158
3159 fk->ports.ports = 0;
3160 noff = skb_network_offset(skb);
3161 if (skb->protocol == htons(ETH_P_IP)) {
3162 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3163 return false;
3164 iph = ip_hdr(skb);
3165 iph_to_flow_copy_v4addrs(fk, iph);
3166 noff += iph->ihl << 2;
3167 if (!ip_is_fragment(iph))
3168 proto = iph->protocol;
3169 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3170 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3171 return false;
3172 iph6 = ipv6_hdr(skb);
3173 iph_to_flow_copy_v6addrs(fk, iph6);
3174 noff += sizeof(*iph6);
3175 proto = iph6->nexthdr;
3176 } else {
3177 return false;
3178 }
3179 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3180 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3181
3182 return true;
3183 }
3184
3185 /**
3186 * bond_xmit_hash - generate a hash value based on the xmit policy
3187 * @bond: bonding device
3188 * @skb: buffer to use for headers
3189 *
3190 * This function will extract the necessary headers from the skb buffer and use
3191 * them to generate a hash based on the xmit_policy set in the bonding device
3192 */
3193 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3194 {
3195 struct flow_keys flow;
3196 u32 hash;
3197
3198 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3199 skb->l4_hash)
3200 return skb->hash;
3201
3202 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3203 !bond_flow_dissect(bond, skb, &flow))
3204 return bond_eth_hash(skb);
3205
3206 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3207 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3208 hash = bond_eth_hash(skb);
3209 else
3210 hash = (__force u32)flow.ports.ports;
3211 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3212 (__force u32)flow_get_u32_src(&flow);
3213 hash ^= (hash >> 16);
3214 hash ^= (hash >> 8);
3215
3216 return hash;
3217 }
3218
3219 /*-------------------------- Device entry points ----------------------------*/
3220
3221 static void bond_work_init_all(struct bonding *bond)
3222 {
3223 INIT_DELAYED_WORK(&bond->mcast_work,
3224 bond_resend_igmp_join_requests_delayed);
3225 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3226 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3227 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3228 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3229 else
3230 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3231 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3232 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3233 }
3234
3235 static void bond_work_cancel_all(struct bonding *bond)
3236 {
3237 cancel_delayed_work_sync(&bond->mii_work);
3238 cancel_delayed_work_sync(&bond->arp_work);
3239 cancel_delayed_work_sync(&bond->alb_work);
3240 cancel_delayed_work_sync(&bond->ad_work);
3241 cancel_delayed_work_sync(&bond->mcast_work);
3242 cancel_delayed_work_sync(&bond->slave_arr_work);
3243 }
3244
3245 static int bond_open(struct net_device *bond_dev)
3246 {
3247 struct bonding *bond = netdev_priv(bond_dev);
3248 struct list_head *iter;
3249 struct slave *slave;
3250
3251 /* reset slave->backup and slave->inactive */
3252 if (bond_has_slaves(bond)) {
3253 bond_for_each_slave(bond, slave, iter) {
3254 if (bond_uses_primary(bond) &&
3255 slave != rcu_access_pointer(bond->curr_active_slave)) {
3256 bond_set_slave_inactive_flags(slave,
3257 BOND_SLAVE_NOTIFY_NOW);
3258 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3259 bond_set_slave_active_flags(slave,
3260 BOND_SLAVE_NOTIFY_NOW);
3261 }
3262 }
3263 }
3264
3265 bond_work_init_all(bond);
3266
3267 if (bond_is_lb(bond)) {
3268 /* bond_alb_initialize must be called before the timer
3269 * is started.
3270 */
3271 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3272 return -ENOMEM;
3273 if (bond->params.tlb_dynamic_lb)
3274 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3275 }
3276
3277 if (bond->params.miimon) /* link check interval, in milliseconds. */
3278 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3279
3280 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3281 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3282 bond->recv_probe = bond_arp_rcv;
3283 }
3284
3285 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3286 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3287 /* register to receive LACPDUs */
3288 bond->recv_probe = bond_3ad_lacpdu_recv;
3289 bond_3ad_initiate_agg_selection(bond, 1);
3290 }
3291
3292 if (bond_mode_uses_xmit_hash(bond))
3293 bond_update_slave_arr(bond, NULL);
3294
3295 return 0;
3296 }
3297
3298 static int bond_close(struct net_device *bond_dev)
3299 {
3300 struct bonding *bond = netdev_priv(bond_dev);
3301
3302 bond_work_cancel_all(bond);
3303 bond->send_peer_notif = 0;
3304 if (bond_is_lb(bond))
3305 bond_alb_deinitialize(bond);
3306 bond->recv_probe = NULL;
3307
3308 return 0;
3309 }
3310
3311 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3312 struct rtnl_link_stats64 *stats)
3313 {
3314 struct bonding *bond = netdev_priv(bond_dev);
3315 struct rtnl_link_stats64 temp;
3316 struct list_head *iter;
3317 struct slave *slave;
3318
3319 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3320
3321 bond_for_each_slave(bond, slave, iter) {
3322 const struct rtnl_link_stats64 *sstats =
3323 dev_get_stats(slave->dev, &temp);
3324 struct rtnl_link_stats64 *pstats = &slave->slave_stats;
3325
3326 stats->rx_packets += sstats->rx_packets - pstats->rx_packets;
3327 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
3328 stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
3329 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
3330
3331 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;;
3332 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
3333 stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
3334 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped;
3335
3336 stats->multicast += sstats->multicast - pstats->multicast;
3337 stats->collisions += sstats->collisions - pstats->collisions;
3338
3339 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
3340 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
3341 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
3342 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
3343 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
3344 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
3345
3346 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors;
3347 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
3348 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
3349 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
3350 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors;
3351
3352 /* save off the slave stats for the next run */
3353 memcpy(pstats, sstats, sizeof(*sstats));
3354 }
3355 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3356
3357 return stats;
3358 }
3359
3360 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3361 {
3362 struct bonding *bond = netdev_priv(bond_dev);
3363 struct net_device *slave_dev = NULL;
3364 struct ifbond k_binfo;
3365 struct ifbond __user *u_binfo = NULL;
3366 struct ifslave k_sinfo;
3367 struct ifslave __user *u_sinfo = NULL;
3368 struct mii_ioctl_data *mii = NULL;
3369 struct bond_opt_value newval;
3370 struct net *net;
3371 int res = 0;
3372
3373 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3374
3375 switch (cmd) {
3376 case SIOCGMIIPHY:
3377 mii = if_mii(ifr);
3378 if (!mii)
3379 return -EINVAL;
3380
3381 mii->phy_id = 0;
3382 /* Fall Through */
3383 case SIOCGMIIREG:
3384 /* We do this again just in case we were called by SIOCGMIIREG
3385 * instead of SIOCGMIIPHY.
3386 */
3387 mii = if_mii(ifr);
3388 if (!mii)
3389 return -EINVAL;
3390
3391 if (mii->reg_num == 1) {
3392 mii->val_out = 0;
3393 if (netif_carrier_ok(bond->dev))
3394 mii->val_out = BMSR_LSTATUS;
3395 }
3396
3397 return 0;
3398 case BOND_INFO_QUERY_OLD:
3399 case SIOCBONDINFOQUERY:
3400 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3401
3402 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3403 return -EFAULT;
3404
3405 res = bond_info_query(bond_dev, &k_binfo);
3406 if (res == 0 &&
3407 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3408 return -EFAULT;
3409
3410 return res;
3411 case BOND_SLAVE_INFO_QUERY_OLD:
3412 case SIOCBONDSLAVEINFOQUERY:
3413 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3414
3415 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3416 return -EFAULT;
3417
3418 res = bond_slave_info_query(bond_dev, &k_sinfo);
3419 if (res == 0 &&
3420 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3421 return -EFAULT;
3422
3423 return res;
3424 default:
3425 break;
3426 }
3427
3428 net = dev_net(bond_dev);
3429
3430 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3431 return -EPERM;
3432
3433 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3434
3435 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3436
3437 if (!slave_dev)
3438 return -ENODEV;
3439
3440 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3441 switch (cmd) {
3442 case BOND_ENSLAVE_OLD:
3443 case SIOCBONDENSLAVE:
3444 res = bond_enslave(bond_dev, slave_dev);
3445 break;
3446 case BOND_RELEASE_OLD:
3447 case SIOCBONDRELEASE:
3448 res = bond_release(bond_dev, slave_dev);
3449 break;
3450 case BOND_SETHWADDR_OLD:
3451 case SIOCBONDSETHWADDR:
3452 bond_set_dev_addr(bond_dev, slave_dev);
3453 res = 0;
3454 break;
3455 case BOND_CHANGE_ACTIVE_OLD:
3456 case SIOCBONDCHANGEACTIVE:
3457 bond_opt_initstr(&newval, slave_dev->name);
3458 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3459 break;
3460 default:
3461 res = -EOPNOTSUPP;
3462 }
3463
3464 return res;
3465 }
3466
3467 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3468 {
3469 struct bonding *bond = netdev_priv(bond_dev);
3470
3471 if (change & IFF_PROMISC)
3472 bond_set_promiscuity(bond,
3473 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3474
3475 if (change & IFF_ALLMULTI)
3476 bond_set_allmulti(bond,
3477 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3478 }
3479
3480 static void bond_set_rx_mode(struct net_device *bond_dev)
3481 {
3482 struct bonding *bond = netdev_priv(bond_dev);
3483 struct list_head *iter;
3484 struct slave *slave;
3485
3486 rcu_read_lock();
3487 if (bond_uses_primary(bond)) {
3488 slave = rcu_dereference(bond->curr_active_slave);
3489 if (slave) {
3490 dev_uc_sync(slave->dev, bond_dev);
3491 dev_mc_sync(slave->dev, bond_dev);
3492 }
3493 } else {
3494 bond_for_each_slave_rcu(bond, slave, iter) {
3495 dev_uc_sync_multiple(slave->dev, bond_dev);
3496 dev_mc_sync_multiple(slave->dev, bond_dev);
3497 }
3498 }
3499 rcu_read_unlock();
3500 }
3501
3502 static int bond_neigh_init(struct neighbour *n)
3503 {
3504 struct bonding *bond = netdev_priv(n->dev);
3505 const struct net_device_ops *slave_ops;
3506 struct neigh_parms parms;
3507 struct slave *slave;
3508 int ret;
3509
3510 slave = bond_first_slave(bond);
3511 if (!slave)
3512 return 0;
3513 slave_ops = slave->dev->netdev_ops;
3514 if (!slave_ops->ndo_neigh_setup)
3515 return 0;
3516
3517 parms.neigh_setup = NULL;
3518 parms.neigh_cleanup = NULL;
3519 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3520 if (ret)
3521 return ret;
3522
3523 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3524 * after the last slave has been detached. Assumes that all slaves
3525 * utilize the same neigh_cleanup (true at this writing as only user
3526 * is ipoib).
3527 */
3528 n->parms->neigh_cleanup = parms.neigh_cleanup;
3529
3530 if (!parms.neigh_setup)
3531 return 0;
3532
3533 return parms.neigh_setup(n);
3534 }
3535
3536 /* The bonding ndo_neigh_setup is called at init time beofre any
3537 * slave exists. So we must declare proxy setup function which will
3538 * be used at run time to resolve the actual slave neigh param setup.
3539 *
3540 * It's also called by master devices (such as vlans) to setup their
3541 * underlying devices. In that case - do nothing, we're already set up from
3542 * our init.
3543 */
3544 static int bond_neigh_setup(struct net_device *dev,
3545 struct neigh_parms *parms)
3546 {
3547 /* modify only our neigh_parms */
3548 if (parms->dev == dev)
3549 parms->neigh_setup = bond_neigh_init;
3550
3551 return 0;
3552 }
3553
3554 /* Change the MTU of all of a master's slaves to match the master */
3555 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3556 {
3557 struct bonding *bond = netdev_priv(bond_dev);
3558 struct slave *slave, *rollback_slave;
3559 struct list_head *iter;
3560 int res = 0;
3561
3562 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3563
3564 bond_for_each_slave(bond, slave, iter) {
3565 netdev_dbg(bond_dev, "s %p c_m %p\n",
3566 slave, slave->dev->netdev_ops->ndo_change_mtu);
3567
3568 res = dev_set_mtu(slave->dev, new_mtu);
3569
3570 if (res) {
3571 /* If we failed to set the slave's mtu to the new value
3572 * we must abort the operation even in ACTIVE_BACKUP
3573 * mode, because if we allow the backup slaves to have
3574 * different mtu values than the active slave we'll
3575 * need to change their mtu when doing a failover. That
3576 * means changing their mtu from timer context, which
3577 * is probably not a good idea.
3578 */
3579 netdev_dbg(bond_dev, "err %d %s\n", res,
3580 slave->dev->name);
3581 goto unwind;
3582 }
3583 }
3584
3585 bond_dev->mtu = new_mtu;
3586
3587 return 0;
3588
3589 unwind:
3590 /* unwind from head to the slave that failed */
3591 bond_for_each_slave(bond, rollback_slave, iter) {
3592 int tmp_res;
3593
3594 if (rollback_slave == slave)
3595 break;
3596
3597 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3598 if (tmp_res) {
3599 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3600 tmp_res, rollback_slave->dev->name);
3601 }
3602 }
3603
3604 return res;
3605 }
3606
3607 /* Change HW address
3608 *
3609 * Note that many devices must be down to change the HW address, and
3610 * downing the master releases all slaves. We can make bonds full of
3611 * bonding devices to test this, however.
3612 */
3613 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3614 {
3615 struct bonding *bond = netdev_priv(bond_dev);
3616 struct slave *slave, *rollback_slave;
3617 struct sockaddr *sa = addr, tmp_sa;
3618 struct list_head *iter;
3619 int res = 0;
3620
3621 if (BOND_MODE(bond) == BOND_MODE_ALB)
3622 return bond_alb_set_mac_address(bond_dev, addr);
3623
3624
3625 netdev_dbg(bond_dev, "bond=%p\n", bond);
3626
3627 /* If fail_over_mac is enabled, do nothing and return success.
3628 * Returning an error causes ifenslave to fail.
3629 */
3630 if (bond->params.fail_over_mac &&
3631 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3632 return 0;
3633
3634 if (!is_valid_ether_addr(sa->sa_data))
3635 return -EADDRNOTAVAIL;
3636
3637 bond_for_each_slave(bond, slave, iter) {
3638 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3639 res = dev_set_mac_address(slave->dev, addr);
3640 if (res) {
3641 /* TODO: consider downing the slave
3642 * and retry ?
3643 * User should expect communications
3644 * breakage anyway until ARP finish
3645 * updating, so...
3646 */
3647 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3648 goto unwind;
3649 }
3650 }
3651
3652 /* success */
3653 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3654 return 0;
3655
3656 unwind:
3657 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3658 tmp_sa.sa_family = bond_dev->type;
3659
3660 /* unwind from head to the slave that failed */
3661 bond_for_each_slave(bond, rollback_slave, iter) {
3662 int tmp_res;
3663
3664 if (rollback_slave == slave)
3665 break;
3666
3667 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3668 if (tmp_res) {
3669 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3670 tmp_res, rollback_slave->dev->name);
3671 }
3672 }
3673
3674 return res;
3675 }
3676
3677 /**
3678 * bond_xmit_slave_id - transmit skb through slave with slave_id
3679 * @bond: bonding device that is transmitting
3680 * @skb: buffer to transmit
3681 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3682 *
3683 * This function tries to transmit through slave with slave_id but in case
3684 * it fails, it tries to find the first available slave for transmission.
3685 * The skb is consumed in all cases, thus the function is void.
3686 */
3687 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3688 {
3689 struct list_head *iter;
3690 struct slave *slave;
3691 int i = slave_id;
3692
3693 /* Here we start from the slave with slave_id */
3694 bond_for_each_slave_rcu(bond, slave, iter) {
3695 if (--i < 0) {
3696 if (bond_slave_can_tx(slave)) {
3697 bond_dev_queue_xmit(bond, skb, slave->dev);
3698 return;
3699 }
3700 }
3701 }
3702
3703 /* Here we start from the first slave up to slave_id */
3704 i = slave_id;
3705 bond_for_each_slave_rcu(bond, slave, iter) {
3706 if (--i < 0)
3707 break;
3708 if (bond_slave_can_tx(slave)) {
3709 bond_dev_queue_xmit(bond, skb, slave->dev);
3710 return;
3711 }
3712 }
3713 /* no slave that can tx has been found */
3714 bond_tx_drop(bond->dev, skb);
3715 }
3716
3717 /**
3718 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3719 * @bond: bonding device to use
3720 *
3721 * Based on the value of the bonding device's packets_per_slave parameter
3722 * this function generates a slave id, which is usually used as the next
3723 * slave to transmit through.
3724 */
3725 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3726 {
3727 u32 slave_id;
3728 struct reciprocal_value reciprocal_packets_per_slave;
3729 int packets_per_slave = bond->params.packets_per_slave;
3730
3731 switch (packets_per_slave) {
3732 case 0:
3733 slave_id = prandom_u32();
3734 break;
3735 case 1:
3736 slave_id = bond->rr_tx_counter;
3737 break;
3738 default:
3739 reciprocal_packets_per_slave =
3740 bond->params.reciprocal_packets_per_slave;
3741 slave_id = reciprocal_divide(bond->rr_tx_counter,
3742 reciprocal_packets_per_slave);
3743 break;
3744 }
3745 bond->rr_tx_counter++;
3746
3747 return slave_id;
3748 }
3749
3750 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3751 {
3752 struct bonding *bond = netdev_priv(bond_dev);
3753 struct iphdr *iph = ip_hdr(skb);
3754 struct slave *slave;
3755 u32 slave_id;
3756
3757 /* Start with the curr_active_slave that joined the bond as the
3758 * default for sending IGMP traffic. For failover purposes one
3759 * needs to maintain some consistency for the interface that will
3760 * send the join/membership reports. The curr_active_slave found
3761 * will send all of this type of traffic.
3762 */
3763 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3764 slave = rcu_dereference(bond->curr_active_slave);
3765 if (slave)
3766 bond_dev_queue_xmit(bond, skb, slave->dev);
3767 else
3768 bond_xmit_slave_id(bond, skb, 0);
3769 } else {
3770 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3771
3772 if (likely(slave_cnt)) {
3773 slave_id = bond_rr_gen_slave_id(bond);
3774 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3775 } else {
3776 bond_tx_drop(bond_dev, skb);
3777 }
3778 }
3779
3780 return NETDEV_TX_OK;
3781 }
3782
3783 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3784 * the bond has a usable interface.
3785 */
3786 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3787 {
3788 struct bonding *bond = netdev_priv(bond_dev);
3789 struct slave *slave;
3790
3791 slave = rcu_dereference(bond->curr_active_slave);
3792 if (slave)
3793 bond_dev_queue_xmit(bond, skb, slave->dev);
3794 else
3795 bond_tx_drop(bond_dev, skb);
3796
3797 return NETDEV_TX_OK;
3798 }
3799
3800 /* Use this to update slave_array when (a) it's not appropriate to update
3801 * slave_array right away (note that update_slave_array() may sleep)
3802 * and / or (b) RTNL is not held.
3803 */
3804 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3805 {
3806 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3807 }
3808
3809 /* Slave array work handler. Holds only RTNL */
3810 static void bond_slave_arr_handler(struct work_struct *work)
3811 {
3812 struct bonding *bond = container_of(work, struct bonding,
3813 slave_arr_work.work);
3814 int ret;
3815
3816 if (!rtnl_trylock())
3817 goto err;
3818
3819 ret = bond_update_slave_arr(bond, NULL);
3820 rtnl_unlock();
3821 if (ret) {
3822 pr_warn_ratelimited("Failed to update slave array from WT\n");
3823 goto err;
3824 }
3825 return;
3826
3827 err:
3828 bond_slave_arr_work_rearm(bond, 1);
3829 }
3830
3831 /* Build the usable slaves array in control path for modes that use xmit-hash
3832 * to determine the slave interface -
3833 * (a) BOND_MODE_8023AD
3834 * (b) BOND_MODE_XOR
3835 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3836 *
3837 * The caller is expected to hold RTNL only and NO other lock!
3838 */
3839 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3840 {
3841 struct slave *slave;
3842 struct list_head *iter;
3843 struct bond_up_slave *new_arr, *old_arr;
3844 int agg_id = 0;
3845 int ret = 0;
3846
3847 #ifdef CONFIG_LOCKDEP
3848 WARN_ON(lockdep_is_held(&bond->mode_lock));
3849 #endif
3850
3851 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3852 GFP_KERNEL);
3853 if (!new_arr) {
3854 ret = -ENOMEM;
3855 pr_err("Failed to build slave-array.\n");
3856 goto out;
3857 }
3858 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3859 struct ad_info ad_info;
3860
3861 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3862 pr_debug("bond_3ad_get_active_agg_info failed\n");
3863 kfree_rcu(new_arr, rcu);
3864 /* No active aggragator means it's not safe to use
3865 * the previous array.
3866 */
3867 old_arr = rtnl_dereference(bond->slave_arr);
3868 if (old_arr) {
3869 RCU_INIT_POINTER(bond->slave_arr, NULL);
3870 kfree_rcu(old_arr, rcu);
3871 }
3872 goto out;
3873 }
3874 agg_id = ad_info.aggregator_id;
3875 }
3876 bond_for_each_slave(bond, slave, iter) {
3877 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3878 struct aggregator *agg;
3879
3880 agg = SLAVE_AD_INFO(slave)->port.aggregator;
3881 if (!agg || agg->aggregator_identifier != agg_id)
3882 continue;
3883 }
3884 if (!bond_slave_can_tx(slave))
3885 continue;
3886 if (skipslave == slave)
3887 continue;
3888 new_arr->arr[new_arr->count++] = slave;
3889 }
3890
3891 old_arr = rtnl_dereference(bond->slave_arr);
3892 rcu_assign_pointer(bond->slave_arr, new_arr);
3893 if (old_arr)
3894 kfree_rcu(old_arr, rcu);
3895 out:
3896 if (ret != 0 && skipslave) {
3897 int idx;
3898
3899 /* Rare situation where caller has asked to skip a specific
3900 * slave but allocation failed (most likely!). BTW this is
3901 * only possible when the call is initiated from
3902 * __bond_release_one(). In this situation; overwrite the
3903 * skipslave entry in the array with the last entry from the
3904 * array to avoid a situation where the xmit path may choose
3905 * this to-be-skipped slave to send a packet out.
3906 */
3907 old_arr = rtnl_dereference(bond->slave_arr);
3908 for (idx = 0; idx < old_arr->count; idx++) {
3909 if (skipslave == old_arr->arr[idx]) {
3910 old_arr->arr[idx] =
3911 old_arr->arr[old_arr->count-1];
3912 old_arr->count--;
3913 break;
3914 }
3915 }
3916 }
3917 return ret;
3918 }
3919
3920 /* Use this Xmit function for 3AD as well as XOR modes. The current
3921 * usable slave array is formed in the control path. The xmit function
3922 * just calculates hash and sends the packet out.
3923 */
3924 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3925 {
3926 struct bonding *bond = netdev_priv(dev);
3927 struct slave *slave;
3928 struct bond_up_slave *slaves;
3929 unsigned int count;
3930
3931 slaves = rcu_dereference(bond->slave_arr);
3932 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3933 if (likely(count)) {
3934 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3935 bond_dev_queue_xmit(bond, skb, slave->dev);
3936 } else {
3937 bond_tx_drop(dev, skb);
3938 }
3939
3940 return NETDEV_TX_OK;
3941 }
3942
3943 /* in broadcast mode, we send everything to all usable interfaces. */
3944 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3945 {
3946 struct bonding *bond = netdev_priv(bond_dev);
3947 struct slave *slave = NULL;
3948 struct list_head *iter;
3949
3950 bond_for_each_slave_rcu(bond, slave, iter) {
3951 if (bond_is_last_slave(bond, slave))
3952 break;
3953 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3954 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3955
3956 if (!skb2) {
3957 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3958 bond_dev->name, __func__);
3959 continue;
3960 }
3961 bond_dev_queue_xmit(bond, skb2, slave->dev);
3962 }
3963 }
3964 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3965 bond_dev_queue_xmit(bond, skb, slave->dev);
3966 else
3967 bond_tx_drop(bond_dev, skb);
3968
3969 return NETDEV_TX_OK;
3970 }
3971
3972 /*------------------------- Device initialization ---------------------------*/
3973
3974 /* Lookup the slave that corresponds to a qid */
3975 static inline int bond_slave_override(struct bonding *bond,
3976 struct sk_buff *skb)
3977 {
3978 struct slave *slave = NULL;
3979 struct list_head *iter;
3980
3981 if (!skb->queue_mapping)
3982 return 1;
3983
3984 /* Find out if any slaves have the same mapping as this skb. */
3985 bond_for_each_slave_rcu(bond, slave, iter) {
3986 if (slave->queue_id == skb->queue_mapping) {
3987 if (bond_slave_is_up(slave) &&
3988 slave->link == BOND_LINK_UP) {
3989 bond_dev_queue_xmit(bond, skb, slave->dev);
3990 return 0;
3991 }
3992 /* If the slave isn't UP, use default transmit policy. */
3993 break;
3994 }
3995 }
3996
3997 return 1;
3998 }
3999
4000
4001 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4002 void *accel_priv, select_queue_fallback_t fallback)
4003 {
4004 /* This helper function exists to help dev_pick_tx get the correct
4005 * destination queue. Using a helper function skips a call to
4006 * skb_tx_hash and will put the skbs in the queue we expect on their
4007 * way down to the bonding driver.
4008 */
4009 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4010
4011 /* Save the original txq to restore before passing to the driver */
4012 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4013
4014 if (unlikely(txq >= dev->real_num_tx_queues)) {
4015 do {
4016 txq -= dev->real_num_tx_queues;
4017 } while (txq >= dev->real_num_tx_queues);
4018 }
4019 return txq;
4020 }
4021
4022 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4023 {
4024 struct bonding *bond = netdev_priv(dev);
4025
4026 if (bond_should_override_tx_queue(bond) &&
4027 !bond_slave_override(bond, skb))
4028 return NETDEV_TX_OK;
4029
4030 switch (BOND_MODE(bond)) {
4031 case BOND_MODE_ROUNDROBIN:
4032 return bond_xmit_roundrobin(skb, dev);
4033 case BOND_MODE_ACTIVEBACKUP:
4034 return bond_xmit_activebackup(skb, dev);
4035 case BOND_MODE_8023AD:
4036 case BOND_MODE_XOR:
4037 return bond_3ad_xor_xmit(skb, dev);
4038 case BOND_MODE_BROADCAST:
4039 return bond_xmit_broadcast(skb, dev);
4040 case BOND_MODE_ALB:
4041 return bond_alb_xmit(skb, dev);
4042 case BOND_MODE_TLB:
4043 return bond_tlb_xmit(skb, dev);
4044 default:
4045 /* Should never happen, mode already checked */
4046 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4047 WARN_ON_ONCE(1);
4048 bond_tx_drop(dev, skb);
4049 return NETDEV_TX_OK;
4050 }
4051 }
4052
4053 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4054 {
4055 struct bonding *bond = netdev_priv(dev);
4056 netdev_tx_t ret = NETDEV_TX_OK;
4057
4058 /* If we risk deadlock from transmitting this in the
4059 * netpoll path, tell netpoll to queue the frame for later tx
4060 */
4061 if (unlikely(is_netpoll_tx_blocked(dev)))
4062 return NETDEV_TX_BUSY;
4063
4064 rcu_read_lock();
4065 if (bond_has_slaves(bond))
4066 ret = __bond_start_xmit(skb, dev);
4067 else
4068 bond_tx_drop(dev, skb);
4069 rcu_read_unlock();
4070
4071 return ret;
4072 }
4073
4074 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4075 struct ethtool_cmd *ecmd)
4076 {
4077 struct bonding *bond = netdev_priv(bond_dev);
4078 unsigned long speed = 0;
4079 struct list_head *iter;
4080 struct slave *slave;
4081
4082 ecmd->duplex = DUPLEX_UNKNOWN;
4083 ecmd->port = PORT_OTHER;
4084
4085 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4086 * do not need to check mode. Though link speed might not represent
4087 * the true receive or transmit bandwidth (not all modes are symmetric)
4088 * this is an accurate maximum.
4089 */
4090 bond_for_each_slave(bond, slave, iter) {
4091 if (bond_slave_can_tx(slave)) {
4092 if (slave->speed != SPEED_UNKNOWN)
4093 speed += slave->speed;
4094 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4095 slave->duplex != DUPLEX_UNKNOWN)
4096 ecmd->duplex = slave->duplex;
4097 }
4098 }
4099 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4100
4101 return 0;
4102 }
4103
4104 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4105 struct ethtool_drvinfo *drvinfo)
4106 {
4107 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4108 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4109 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4110 BOND_ABI_VERSION);
4111 }
4112
4113 static const struct ethtool_ops bond_ethtool_ops = {
4114 .get_drvinfo = bond_ethtool_get_drvinfo,
4115 .get_settings = bond_ethtool_get_settings,
4116 .get_link = ethtool_op_get_link,
4117 };
4118
4119 static const struct net_device_ops bond_netdev_ops = {
4120 .ndo_init = bond_init,
4121 .ndo_uninit = bond_uninit,
4122 .ndo_open = bond_open,
4123 .ndo_stop = bond_close,
4124 .ndo_start_xmit = bond_start_xmit,
4125 .ndo_select_queue = bond_select_queue,
4126 .ndo_get_stats64 = bond_get_stats,
4127 .ndo_do_ioctl = bond_do_ioctl,
4128 .ndo_change_rx_flags = bond_change_rx_flags,
4129 .ndo_set_rx_mode = bond_set_rx_mode,
4130 .ndo_change_mtu = bond_change_mtu,
4131 .ndo_set_mac_address = bond_set_mac_address,
4132 .ndo_neigh_setup = bond_neigh_setup,
4133 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4134 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4135 #ifdef CONFIG_NET_POLL_CONTROLLER
4136 .ndo_netpoll_setup = bond_netpoll_setup,
4137 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4138 .ndo_poll_controller = bond_poll_controller,
4139 #endif
4140 .ndo_add_slave = bond_enslave,
4141 .ndo_del_slave = bond_release,
4142 .ndo_fix_features = bond_fix_features,
4143 .ndo_bridge_setlink = switchdev_port_bridge_setlink,
4144 .ndo_bridge_getlink = switchdev_port_bridge_getlink,
4145 .ndo_bridge_dellink = switchdev_port_bridge_dellink,
4146 .ndo_fdb_add = switchdev_port_fdb_add,
4147 .ndo_fdb_del = switchdev_port_fdb_del,
4148 .ndo_fdb_dump = switchdev_port_fdb_dump,
4149 .ndo_features_check = passthru_features_check,
4150 };
4151
4152 static const struct device_type bond_type = {
4153 .name = "bond",
4154 };
4155
4156 static void bond_destructor(struct net_device *bond_dev)
4157 {
4158 struct bonding *bond = netdev_priv(bond_dev);
4159 if (bond->wq)
4160 destroy_workqueue(bond->wq);
4161 free_netdev(bond_dev);
4162 }
4163
4164 void bond_setup(struct net_device *bond_dev)
4165 {
4166 struct bonding *bond = netdev_priv(bond_dev);
4167
4168 spin_lock_init(&bond->mode_lock);
4169 bond->params = bonding_defaults;
4170
4171 /* Initialize pointers */
4172 bond->dev = bond_dev;
4173
4174 /* Initialize the device entry points */
4175 ether_setup(bond_dev);
4176 bond_dev->netdev_ops = &bond_netdev_ops;
4177 bond_dev->ethtool_ops = &bond_ethtool_ops;
4178
4179 bond_dev->destructor = bond_destructor;
4180
4181 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4182
4183 /* Initialize the device options */
4184 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4185 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4186 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4187
4188 /* don't acquire bond device's netif_tx_lock when transmitting */
4189 bond_dev->features |= NETIF_F_LLTX;
4190
4191 /* By default, we declare the bond to be fully
4192 * VLAN hardware accelerated capable. Special
4193 * care is taken in the various xmit functions
4194 * when there are slaves that are not hw accel
4195 * capable
4196 */
4197
4198 /* Don't allow bond devices to change network namespaces. */
4199 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4200
4201 bond_dev->hw_features = BOND_VLAN_FEATURES |
4202 NETIF_F_HW_VLAN_CTAG_TX |
4203 NETIF_F_HW_VLAN_CTAG_RX |
4204 NETIF_F_HW_VLAN_CTAG_FILTER;
4205
4206 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4207 bond_dev->features |= bond_dev->hw_features;
4208 }
4209
4210 /* Destroy a bonding device.
4211 * Must be under rtnl_lock when this function is called.
4212 */
4213 static void bond_uninit(struct net_device *bond_dev)
4214 {
4215 struct bonding *bond = netdev_priv(bond_dev);
4216 struct list_head *iter;
4217 struct slave *slave;
4218 struct bond_up_slave *arr;
4219
4220 bond_netpoll_cleanup(bond_dev);
4221
4222 /* Release the bonded slaves */
4223 bond_for_each_slave(bond, slave, iter)
4224 __bond_release_one(bond_dev, slave->dev, true);
4225 netdev_info(bond_dev, "Released all slaves\n");
4226
4227 arr = rtnl_dereference(bond->slave_arr);
4228 if (arr) {
4229 RCU_INIT_POINTER(bond->slave_arr, NULL);
4230 kfree_rcu(arr, rcu);
4231 }
4232
4233 list_del(&bond->bond_list);
4234
4235 bond_debug_unregister(bond);
4236 }
4237
4238 /*------------------------- Module initialization ---------------------------*/
4239
4240 static int bond_check_params(struct bond_params *params)
4241 {
4242 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4243 struct bond_opt_value newval;
4244 const struct bond_opt_value *valptr;
4245 int arp_all_targets_value;
4246 u16 ad_actor_sys_prio = 0;
4247 u16 ad_user_port_key = 0;
4248
4249 /* Convert string parameters. */
4250 if (mode) {
4251 bond_opt_initstr(&newval, mode);
4252 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4253 if (!valptr) {
4254 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4255 return -EINVAL;
4256 }
4257 bond_mode = valptr->value;
4258 }
4259
4260 if (xmit_hash_policy) {
4261 if ((bond_mode != BOND_MODE_XOR) &&
4262 (bond_mode != BOND_MODE_8023AD) &&
4263 (bond_mode != BOND_MODE_TLB)) {
4264 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4265 bond_mode_name(bond_mode));
4266 } else {
4267 bond_opt_initstr(&newval, xmit_hash_policy);
4268 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4269 &newval);
4270 if (!valptr) {
4271 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4272 xmit_hash_policy);
4273 return -EINVAL;
4274 }
4275 xmit_hashtype = valptr->value;
4276 }
4277 }
4278
4279 if (lacp_rate) {
4280 if (bond_mode != BOND_MODE_8023AD) {
4281 pr_info("lacp_rate param is irrelevant in mode %s\n",
4282 bond_mode_name(bond_mode));
4283 } else {
4284 bond_opt_initstr(&newval, lacp_rate);
4285 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4286 &newval);
4287 if (!valptr) {
4288 pr_err("Error: Invalid lacp rate \"%s\"\n",
4289 lacp_rate);
4290 return -EINVAL;
4291 }
4292 lacp_fast = valptr->value;
4293 }
4294 }
4295
4296 if (ad_select) {
4297 bond_opt_initstr(&newval, ad_select);
4298 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4299 &newval);
4300 if (!valptr) {
4301 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4302 return -EINVAL;
4303 }
4304 params->ad_select = valptr->value;
4305 if (bond_mode != BOND_MODE_8023AD)
4306 pr_warn("ad_select param only affects 802.3ad mode\n");
4307 } else {
4308 params->ad_select = BOND_AD_STABLE;
4309 }
4310
4311 if (max_bonds < 0) {
4312 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4313 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4314 max_bonds = BOND_DEFAULT_MAX_BONDS;
4315 }
4316
4317 if (miimon < 0) {
4318 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4319 miimon, INT_MAX);
4320 miimon = 0;
4321 }
4322
4323 if (updelay < 0) {
4324 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4325 updelay, INT_MAX);
4326 updelay = 0;
4327 }
4328
4329 if (downdelay < 0) {
4330 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4331 downdelay, INT_MAX);
4332 downdelay = 0;
4333 }
4334
4335 if ((use_carrier != 0) && (use_carrier != 1)) {
4336 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4337 use_carrier);
4338 use_carrier = 1;
4339 }
4340
4341 if (num_peer_notif < 0 || num_peer_notif > 255) {
4342 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4343 num_peer_notif);
4344 num_peer_notif = 1;
4345 }
4346
4347 /* reset values for 802.3ad/TLB/ALB */
4348 if (!bond_mode_uses_arp(bond_mode)) {
4349 if (!miimon) {
4350 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");
4351 pr_warn("Forcing miimon to 100msec\n");
4352 miimon = BOND_DEFAULT_MIIMON;
4353 }
4354 }
4355
4356 if (tx_queues < 1 || tx_queues > 255) {
4357 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4358 tx_queues, BOND_DEFAULT_TX_QUEUES);
4359 tx_queues = BOND_DEFAULT_TX_QUEUES;
4360 }
4361
4362 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4363 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4364 all_slaves_active);
4365 all_slaves_active = 0;
4366 }
4367
4368 if (resend_igmp < 0 || resend_igmp > 255) {
4369 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4370 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4371 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4372 }
4373
4374 bond_opt_initval(&newval, packets_per_slave);
4375 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4376 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4377 packets_per_slave, USHRT_MAX);
4378 packets_per_slave = 1;
4379 }
4380
4381 if (bond_mode == BOND_MODE_ALB) {
4382 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",
4383 updelay);
4384 }
4385
4386 if (!miimon) {
4387 if (updelay || downdelay) {
4388 /* just warn the user the up/down delay will have
4389 * no effect since miimon is zero...
4390 */
4391 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",
4392 updelay, downdelay);
4393 }
4394 } else {
4395 /* don't allow arp monitoring */
4396 if (arp_interval) {
4397 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4398 miimon, arp_interval);
4399 arp_interval = 0;
4400 }
4401
4402 if ((updelay % miimon) != 0) {
4403 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4404 updelay, miimon, (updelay / miimon) * miimon);
4405 }
4406
4407 updelay /= miimon;
4408
4409 if ((downdelay % miimon) != 0) {
4410 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4411 downdelay, miimon,
4412 (downdelay / miimon) * miimon);
4413 }
4414
4415 downdelay /= miimon;
4416 }
4417
4418 if (arp_interval < 0) {
4419 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4420 arp_interval, INT_MAX);
4421 arp_interval = 0;
4422 }
4423
4424 for (arp_ip_count = 0, i = 0;
4425 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4426 __be32 ip;
4427
4428 /* not a complete check, but good enough to catch mistakes */
4429 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4430 !bond_is_ip_target_ok(ip)) {
4431 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4432 arp_ip_target[i]);
4433 arp_interval = 0;
4434 } else {
4435 if (bond_get_targets_ip(arp_target, ip) == -1)
4436 arp_target[arp_ip_count++] = ip;
4437 else
4438 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4439 &ip);
4440 }
4441 }
4442
4443 if (arp_interval && !arp_ip_count) {
4444 /* don't allow arping if no arp_ip_target given... */
4445 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4446 arp_interval);
4447 arp_interval = 0;
4448 }
4449
4450 if (arp_validate) {
4451 if (!arp_interval) {
4452 pr_err("arp_validate requires arp_interval\n");
4453 return -EINVAL;
4454 }
4455
4456 bond_opt_initstr(&newval, arp_validate);
4457 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4458 &newval);
4459 if (!valptr) {
4460 pr_err("Error: invalid arp_validate \"%s\"\n",
4461 arp_validate);
4462 return -EINVAL;
4463 }
4464 arp_validate_value = valptr->value;
4465 } else {
4466 arp_validate_value = 0;
4467 }
4468
4469 arp_all_targets_value = 0;
4470 if (arp_all_targets) {
4471 bond_opt_initstr(&newval, arp_all_targets);
4472 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4473 &newval);
4474 if (!valptr) {
4475 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4476 arp_all_targets);
4477 arp_all_targets_value = 0;
4478 } else {
4479 arp_all_targets_value = valptr->value;
4480 }
4481 }
4482
4483 if (miimon) {
4484 pr_info("MII link monitoring set to %d ms\n", miimon);
4485 } else if (arp_interval) {
4486 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4487 arp_validate_value);
4488 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4489 arp_interval, valptr->string, arp_ip_count);
4490
4491 for (i = 0; i < arp_ip_count; i++)
4492 pr_cont(" %s", arp_ip_target[i]);
4493
4494 pr_cont("\n");
4495
4496 } else if (max_bonds) {
4497 /* miimon and arp_interval not set, we need one so things
4498 * work as expected, see bonding.txt for details
4499 */
4500 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");
4501 }
4502
4503 if (primary && !bond_mode_uses_primary(bond_mode)) {
4504 /* currently, using a primary only makes sense
4505 * in active backup, TLB or ALB modes
4506 */
4507 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4508 primary, bond_mode_name(bond_mode));
4509 primary = NULL;
4510 }
4511
4512 if (primary && primary_reselect) {
4513 bond_opt_initstr(&newval, primary_reselect);
4514 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4515 &newval);
4516 if (!valptr) {
4517 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4518 primary_reselect);
4519 return -EINVAL;
4520 }
4521 primary_reselect_value = valptr->value;
4522 } else {
4523 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4524 }
4525
4526 if (fail_over_mac) {
4527 bond_opt_initstr(&newval, fail_over_mac);
4528 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4529 &newval);
4530 if (!valptr) {
4531 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4532 fail_over_mac);
4533 return -EINVAL;
4534 }
4535 fail_over_mac_value = valptr->value;
4536 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4537 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4538 } else {
4539 fail_over_mac_value = BOND_FOM_NONE;
4540 }
4541
4542 bond_opt_initstr(&newval, "default");
4543 valptr = bond_opt_parse(
4544 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4545 &newval);
4546 if (!valptr) {
4547 pr_err("Error: No ad_actor_sys_prio default value");
4548 return -EINVAL;
4549 }
4550 ad_actor_sys_prio = valptr->value;
4551
4552 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4553 &newval);
4554 if (!valptr) {
4555 pr_err("Error: No ad_user_port_key default value");
4556 return -EINVAL;
4557 }
4558 ad_user_port_key = valptr->value;
4559
4560 if (lp_interval == 0) {
4561 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4562 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4563 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4564 }
4565
4566 /* fill params struct with the proper values */
4567 params->mode = bond_mode;
4568 params->xmit_policy = xmit_hashtype;
4569 params->miimon = miimon;
4570 params->num_peer_notif = num_peer_notif;
4571 params->arp_interval = arp_interval;
4572 params->arp_validate = arp_validate_value;
4573 params->arp_all_targets = arp_all_targets_value;
4574 params->updelay = updelay;
4575 params->downdelay = downdelay;
4576 params->use_carrier = use_carrier;
4577 params->lacp_fast = lacp_fast;
4578 params->primary[0] = 0;
4579 params->primary_reselect = primary_reselect_value;
4580 params->fail_over_mac = fail_over_mac_value;
4581 params->tx_queues = tx_queues;
4582 params->all_slaves_active = all_slaves_active;
4583 params->resend_igmp = resend_igmp;
4584 params->min_links = min_links;
4585 params->lp_interval = lp_interval;
4586 params->packets_per_slave = packets_per_slave;
4587 params->tlb_dynamic_lb = 1; /* Default value */
4588 params->ad_actor_sys_prio = ad_actor_sys_prio;
4589 eth_zero_addr(params->ad_actor_system);
4590 params->ad_user_port_key = ad_user_port_key;
4591 if (packets_per_slave > 0) {
4592 params->reciprocal_packets_per_slave =
4593 reciprocal_value(packets_per_slave);
4594 } else {
4595 /* reciprocal_packets_per_slave is unused if
4596 * packets_per_slave is 0 or 1, just initialize it
4597 */
4598 params->reciprocal_packets_per_slave =
4599 (struct reciprocal_value) { 0 };
4600 }
4601
4602 if (primary) {
4603 strncpy(params->primary, primary, IFNAMSIZ);
4604 params->primary[IFNAMSIZ - 1] = 0;
4605 }
4606
4607 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4608
4609 return 0;
4610 }
4611
4612 static struct lock_class_key bonding_netdev_xmit_lock_key;
4613 static struct lock_class_key bonding_netdev_addr_lock_key;
4614 static struct lock_class_key bonding_tx_busylock_key;
4615
4616 static void bond_set_lockdep_class_one(struct net_device *dev,
4617 struct netdev_queue *txq,
4618 void *_unused)
4619 {
4620 lockdep_set_class(&txq->_xmit_lock,
4621 &bonding_netdev_xmit_lock_key);
4622 }
4623
4624 static void bond_set_lockdep_class(struct net_device *dev)
4625 {
4626 lockdep_set_class(&dev->addr_list_lock,
4627 &bonding_netdev_addr_lock_key);
4628 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4629 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4630 }
4631
4632 /* Called from registration process */
4633 static int bond_init(struct net_device *bond_dev)
4634 {
4635 struct bonding *bond = netdev_priv(bond_dev);
4636 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4637
4638 netdev_dbg(bond_dev, "Begin bond_init\n");
4639
4640 bond->wq = create_singlethread_workqueue(bond_dev->name);
4641 if (!bond->wq)
4642 return -ENOMEM;
4643
4644 bond_set_lockdep_class(bond_dev);
4645
4646 list_add_tail(&bond->bond_list, &bn->dev_list);
4647
4648 bond_prepare_sysfs_group(bond);
4649
4650 bond_debug_register(bond);
4651
4652 /* Ensure valid dev_addr */
4653 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4654 bond_dev->addr_assign_type == NET_ADDR_PERM)
4655 eth_hw_addr_random(bond_dev);
4656
4657 return 0;
4658 }
4659
4660 unsigned int bond_get_num_tx_queues(void)
4661 {
4662 return tx_queues;
4663 }
4664
4665 /* Create a new bond based on the specified name and bonding parameters.
4666 * If name is NULL, obtain a suitable "bond%d" name for us.
4667 * Caller must NOT hold rtnl_lock; we need to release it here before we
4668 * set up our sysfs entries.
4669 */
4670 int bond_create(struct net *net, const char *name)
4671 {
4672 struct net_device *bond_dev;
4673 struct bonding *bond;
4674 struct alb_bond_info *bond_info;
4675 int res;
4676
4677 rtnl_lock();
4678
4679 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4680 name ? name : "bond%d", NET_NAME_UNKNOWN,
4681 bond_setup, tx_queues);
4682 if (!bond_dev) {
4683 pr_err("%s: eek! can't alloc netdev!\n", name);
4684 rtnl_unlock();
4685 return -ENOMEM;
4686 }
4687
4688 /*
4689 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4690 * It is set to 0 by default which is wrong.
4691 */
4692 bond = netdev_priv(bond_dev);
4693 bond_info = &(BOND_ALB_INFO(bond));
4694 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4695
4696 dev_net_set(bond_dev, net);
4697 bond_dev->rtnl_link_ops = &bond_link_ops;
4698
4699 res = register_netdevice(bond_dev);
4700
4701 netif_carrier_off(bond_dev);
4702
4703 rtnl_unlock();
4704 if (res < 0)
4705 bond_destructor(bond_dev);
4706 return res;
4707 }
4708
4709 static int __net_init bond_net_init(struct net *net)
4710 {
4711 struct bond_net *bn = net_generic(net, bond_net_id);
4712
4713 bn->net = net;
4714 INIT_LIST_HEAD(&bn->dev_list);
4715
4716 bond_create_proc_dir(bn);
4717 bond_create_sysfs(bn);
4718
4719 return 0;
4720 }
4721
4722 static void __net_exit bond_net_exit(struct net *net)
4723 {
4724 struct bond_net *bn = net_generic(net, bond_net_id);
4725 struct bonding *bond, *tmp_bond;
4726 LIST_HEAD(list);
4727
4728 bond_destroy_sysfs(bn);
4729
4730 /* Kill off any bonds created after unregistering bond rtnl ops */
4731 rtnl_lock();
4732 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4733 unregister_netdevice_queue(bond->dev, &list);
4734 unregister_netdevice_many(&list);
4735 rtnl_unlock();
4736
4737 bond_destroy_proc_dir(bn);
4738 }
4739
4740 static struct pernet_operations bond_net_ops = {
4741 .init = bond_net_init,
4742 .exit = bond_net_exit,
4743 .id = &bond_net_id,
4744 .size = sizeof(struct bond_net),
4745 };
4746
4747 static int __init bonding_init(void)
4748 {
4749 int i;
4750 int res;
4751
4752 pr_info("%s", bond_version);
4753
4754 res = bond_check_params(&bonding_defaults);
4755 if (res)
4756 goto out;
4757
4758 res = register_pernet_subsys(&bond_net_ops);
4759 if (res)
4760 goto out;
4761
4762 res = bond_netlink_init();
4763 if (res)
4764 goto err_link;
4765
4766 bond_create_debugfs();
4767
4768 for (i = 0; i < max_bonds; i++) {
4769 res = bond_create(&init_net, NULL);
4770 if (res)
4771 goto err;
4772 }
4773
4774 register_netdevice_notifier(&bond_netdev_notifier);
4775 out:
4776 return res;
4777 err:
4778 bond_destroy_debugfs();
4779 bond_netlink_fini();
4780 err_link:
4781 unregister_pernet_subsys(&bond_net_ops);
4782 goto out;
4783
4784 }
4785
4786 static void __exit bonding_exit(void)
4787 {
4788 unregister_netdevice_notifier(&bond_netdev_notifier);
4789
4790 bond_destroy_debugfs();
4791
4792 bond_netlink_fini();
4793 unregister_pernet_subsys(&bond_net_ops);
4794
4795 #ifdef CONFIG_NET_POLL_CONTROLLER
4796 /* Make sure we don't have an imbalance on our netpoll blocking */
4797 WARN_ON(atomic_read(&netpoll_block_tx));
4798 #endif
4799 }
4800
4801 module_init(bonding_init);
4802 module_exit(bonding_exit);
4803 MODULE_LICENSE("GPL");
4804 MODULE_VERSION(DRV_VERSION);
4805 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4806 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
Linux kernel - Deliverables
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