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Merge tag 'iio-fixes-for-4.5b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23...
[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
218 /*---------------------------- General routines -----------------------------*/
219
220 const char *bond_mode_name(int mode)
221 {
222 static const char *names[] = {
223 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
224 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
225 [BOND_MODE_XOR] = "load balancing (xor)",
226 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
227 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
228 [BOND_MODE_TLB] = "transmit load balancing",
229 [BOND_MODE_ALB] = "adaptive load balancing",
230 };
231
232 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
233 return "unknown";
234
235 return names[mode];
236 }
237
238 /*---------------------------------- VLAN -----------------------------------*/
239
240 /**
241 * bond_dev_queue_xmit - Prepare skb for xmit.
242 *
243 * @bond: bond device that got this skb for tx.
244 * @skb: hw accel VLAN tagged skb to transmit
245 * @slave_dev: slave that is supposed to xmit this skbuff
246 */
247 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
248 struct net_device *slave_dev)
249 {
250 skb->dev = slave_dev;
251
252 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
253 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
254 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
255
256 if (unlikely(netpoll_tx_running(bond->dev)))
257 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
258 else
259 dev_queue_xmit(skb);
260 }
261
262 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
263 * We don't protect the slave list iteration with a lock because:
264 * a. This operation is performed in IOCTL context,
265 * b. The operation is protected by the RTNL semaphore in the 8021q code,
266 * c. Holding a lock with BH disabled while directly calling a base driver
267 * entry point is generally a BAD idea.
268 *
269 * The design of synchronization/protection for this operation in the 8021q
270 * module is good for one or more VLAN devices over a single physical device
271 * and cannot be extended for a teaming solution like bonding, so there is a
272 * potential race condition here where a net device from the vlan group might
273 * be referenced (either by a base driver or the 8021q code) while it is being
274 * removed from the system. However, it turns out we're not making matters
275 * worse, and if it works for regular VLAN usage it will work here too.
276 */
277
278 /**
279 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
280 * @bond_dev: bonding net device that got called
281 * @vid: vlan id being added
282 */
283 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
284 __be16 proto, u16 vid)
285 {
286 struct bonding *bond = netdev_priv(bond_dev);
287 struct slave *slave, *rollback_slave;
288 struct list_head *iter;
289 int res;
290
291 bond_for_each_slave(bond, slave, iter) {
292 res = vlan_vid_add(slave->dev, proto, vid);
293 if (res)
294 goto unwind;
295 }
296
297 return 0;
298
299 unwind:
300 /* unwind to the slave that failed */
301 bond_for_each_slave(bond, rollback_slave, iter) {
302 if (rollback_slave == slave)
303 break;
304
305 vlan_vid_del(rollback_slave->dev, proto, vid);
306 }
307
308 return res;
309 }
310
311 /**
312 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
313 * @bond_dev: bonding net device that got called
314 * @vid: vlan id being removed
315 */
316 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
317 __be16 proto, u16 vid)
318 {
319 struct bonding *bond = netdev_priv(bond_dev);
320 struct list_head *iter;
321 struct slave *slave;
322
323 bond_for_each_slave(bond, slave, iter)
324 vlan_vid_del(slave->dev, proto, vid);
325
326 if (bond_is_lb(bond))
327 bond_alb_clear_vlan(bond, vid);
328
329 return 0;
330 }
331
332 /*------------------------------- Link status -------------------------------*/
333
334 /* Set the carrier state for the master according to the state of its
335 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
336 * do special 802.3ad magic.
337 *
338 * Returns zero if carrier state does not change, nonzero if it does.
339 */
340 int bond_set_carrier(struct bonding *bond)
341 {
342 struct list_head *iter;
343 struct slave *slave;
344
345 if (!bond_has_slaves(bond))
346 goto down;
347
348 if (BOND_MODE(bond) == BOND_MODE_8023AD)
349 return bond_3ad_set_carrier(bond);
350
351 bond_for_each_slave(bond, slave, iter) {
352 if (slave->link == BOND_LINK_UP) {
353 if (!netif_carrier_ok(bond->dev)) {
354 netif_carrier_on(bond->dev);
355 return 1;
356 }
357 return 0;
358 }
359 }
360
361 down:
362 if (netif_carrier_ok(bond->dev)) {
363 netif_carrier_off(bond->dev);
364 return 1;
365 }
366 return 0;
367 }
368
369 /* Get link speed and duplex from the slave's base driver
370 * using ethtool. If for some reason the call fails or the
371 * values are invalid, set speed and duplex to -1,
372 * and return.
373 */
374 static void bond_update_speed_duplex(struct slave *slave)
375 {
376 struct net_device *slave_dev = slave->dev;
377 struct ethtool_cmd ecmd;
378 u32 slave_speed;
379 int res;
380
381 slave->speed = SPEED_UNKNOWN;
382 slave->duplex = DUPLEX_UNKNOWN;
383
384 res = __ethtool_get_settings(slave_dev, &ecmd);
385 if (res < 0)
386 return;
387
388 slave_speed = ethtool_cmd_speed(&ecmd);
389 if (slave_speed == 0 || slave_speed == ((__u32) -1))
390 return;
391
392 switch (ecmd.duplex) {
393 case DUPLEX_FULL:
394 case DUPLEX_HALF:
395 break;
396 default:
397 return;
398 }
399
400 slave->speed = slave_speed;
401 slave->duplex = ecmd.duplex;
402
403 return;
404 }
405
406 const char *bond_slave_link_status(s8 link)
407 {
408 switch (link) {
409 case BOND_LINK_UP:
410 return "up";
411 case BOND_LINK_FAIL:
412 return "going down";
413 case BOND_LINK_DOWN:
414 return "down";
415 case BOND_LINK_BACK:
416 return "going back";
417 default:
418 return "unknown";
419 }
420 }
421
422 /* if <dev> supports MII link status reporting, check its link status.
423 *
424 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
425 * depending upon the setting of the use_carrier parameter.
426 *
427 * Return either BMSR_LSTATUS, meaning that the link is up (or we
428 * can't tell and just pretend it is), or 0, meaning that the link is
429 * down.
430 *
431 * If reporting is non-zero, instead of faking link up, return -1 if
432 * both ETHTOOL and MII ioctls fail (meaning the device does not
433 * support them). If use_carrier is set, return whatever it says.
434 * It'd be nice if there was a good way to tell if a driver supports
435 * netif_carrier, but there really isn't.
436 */
437 static int bond_check_dev_link(struct bonding *bond,
438 struct net_device *slave_dev, int reporting)
439 {
440 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
441 int (*ioctl)(struct net_device *, struct ifreq *, int);
442 struct ifreq ifr;
443 struct mii_ioctl_data *mii;
444
445 if (!reporting && !netif_running(slave_dev))
446 return 0;
447
448 if (bond->params.use_carrier)
449 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
450
451 /* Try to get link status using Ethtool first. */
452 if (slave_dev->ethtool_ops->get_link)
453 return slave_dev->ethtool_ops->get_link(slave_dev) ?
454 BMSR_LSTATUS : 0;
455
456 /* Ethtool can't be used, fallback to MII ioctls. */
457 ioctl = slave_ops->ndo_do_ioctl;
458 if (ioctl) {
459 /* TODO: set pointer to correct ioctl on a per team member
460 * bases to make this more efficient. that is, once
461 * we determine the correct ioctl, we will always
462 * call it and not the others for that team
463 * member.
464 */
465
466 /* We cannot assume that SIOCGMIIPHY will also read a
467 * register; not all network drivers (e.g., e100)
468 * support that.
469 */
470
471 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
472 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
473 mii = if_mii(&ifr);
474 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
475 mii->reg_num = MII_BMSR;
476 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
477 return mii->val_out & BMSR_LSTATUS;
478 }
479 }
480
481 /* If reporting, report that either there's no dev->do_ioctl,
482 * or both SIOCGMIIREG and get_link failed (meaning that we
483 * cannot report link status). If not reporting, pretend
484 * we're ok.
485 */
486 return reporting ? -1 : BMSR_LSTATUS;
487 }
488
489 /*----------------------------- Multicast list ------------------------------*/
490
491 /* Push the promiscuity flag down to appropriate slaves */
492 static int bond_set_promiscuity(struct bonding *bond, int inc)
493 {
494 struct list_head *iter;
495 int err = 0;
496
497 if (bond_uses_primary(bond)) {
498 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
499
500 if (curr_active)
501 err = dev_set_promiscuity(curr_active->dev, inc);
502 } else {
503 struct slave *slave;
504
505 bond_for_each_slave(bond, slave, iter) {
506 err = dev_set_promiscuity(slave->dev, inc);
507 if (err)
508 return err;
509 }
510 }
511 return err;
512 }
513
514 /* Push the allmulti flag down to all slaves */
515 static int bond_set_allmulti(struct bonding *bond, int inc)
516 {
517 struct list_head *iter;
518 int err = 0;
519
520 if (bond_uses_primary(bond)) {
521 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
522
523 if (curr_active)
524 err = dev_set_allmulti(curr_active->dev, inc);
525 } else {
526 struct slave *slave;
527
528 bond_for_each_slave(bond, slave, iter) {
529 err = dev_set_allmulti(slave->dev, inc);
530 if (err)
531 return err;
532 }
533 }
534 return err;
535 }
536
537 /* Retrieve the list of registered multicast addresses for the bonding
538 * device and retransmit an IGMP JOIN request to the current active
539 * slave.
540 */
541 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
542 {
543 struct bonding *bond = container_of(work, struct bonding,
544 mcast_work.work);
545
546 if (!rtnl_trylock()) {
547 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
548 return;
549 }
550 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
551
552 if (bond->igmp_retrans > 1) {
553 bond->igmp_retrans--;
554 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
555 }
556 rtnl_unlock();
557 }
558
559 /* Flush bond's hardware addresses from slave */
560 static void bond_hw_addr_flush(struct net_device *bond_dev,
561 struct net_device *slave_dev)
562 {
563 struct bonding *bond = netdev_priv(bond_dev);
564
565 dev_uc_unsync(slave_dev, bond_dev);
566 dev_mc_unsync(slave_dev, bond_dev);
567
568 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
569 /* del lacpdu mc addr from mc list */
570 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
571
572 dev_mc_del(slave_dev, lacpdu_multicast);
573 }
574 }
575
576 /*--------------------------- Active slave change ---------------------------*/
577
578 /* Update the hardware address list and promisc/allmulti for the new and
579 * old active slaves (if any). Modes that are not using primary keep all
580 * slaves up date at all times; only the modes that use primary need to call
581 * this function to swap these settings during a failover.
582 */
583 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
584 struct slave *old_active)
585 {
586 if (old_active) {
587 if (bond->dev->flags & IFF_PROMISC)
588 dev_set_promiscuity(old_active->dev, -1);
589
590 if (bond->dev->flags & IFF_ALLMULTI)
591 dev_set_allmulti(old_active->dev, -1);
592
593 bond_hw_addr_flush(bond->dev, old_active->dev);
594 }
595
596 if (new_active) {
597 /* FIXME: Signal errors upstream. */
598 if (bond->dev->flags & IFF_PROMISC)
599 dev_set_promiscuity(new_active->dev, 1);
600
601 if (bond->dev->flags & IFF_ALLMULTI)
602 dev_set_allmulti(new_active->dev, 1);
603
604 netif_addr_lock_bh(bond->dev);
605 dev_uc_sync(new_active->dev, bond->dev);
606 dev_mc_sync(new_active->dev, bond->dev);
607 netif_addr_unlock_bh(bond->dev);
608 }
609 }
610
611 /**
612 * bond_set_dev_addr - clone slave's address to bond
613 * @bond_dev: bond net device
614 * @slave_dev: slave net device
615 *
616 * Should be called with RTNL held.
617 */
618 static void bond_set_dev_addr(struct net_device *bond_dev,
619 struct net_device *slave_dev)
620 {
621 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
622 bond_dev, slave_dev, slave_dev->addr_len);
623 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
624 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
625 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
626 }
627
628 static struct slave *bond_get_old_active(struct bonding *bond,
629 struct slave *new_active)
630 {
631 struct slave *slave;
632 struct list_head *iter;
633
634 bond_for_each_slave(bond, slave, iter) {
635 if (slave == new_active)
636 continue;
637
638 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
639 return slave;
640 }
641
642 return NULL;
643 }
644
645 /* bond_do_fail_over_mac
646 *
647 * Perform special MAC address swapping for fail_over_mac settings
648 *
649 * Called with RTNL
650 */
651 static void bond_do_fail_over_mac(struct bonding *bond,
652 struct slave *new_active,
653 struct slave *old_active)
654 {
655 u8 tmp_mac[ETH_ALEN];
656 struct sockaddr saddr;
657 int rv;
658
659 switch (bond->params.fail_over_mac) {
660 case BOND_FOM_ACTIVE:
661 if (new_active)
662 bond_set_dev_addr(bond->dev, new_active->dev);
663 break;
664 case BOND_FOM_FOLLOW:
665 /* if new_active && old_active, swap them
666 * if just old_active, do nothing (going to no active slave)
667 * if just new_active, set new_active to bond's MAC
668 */
669 if (!new_active)
670 return;
671
672 if (!old_active)
673 old_active = bond_get_old_active(bond, new_active);
674
675 if (old_active) {
676 ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
677 ether_addr_copy(saddr.sa_data,
678 old_active->dev->dev_addr);
679 saddr.sa_family = new_active->dev->type;
680 } else {
681 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
682 saddr.sa_family = bond->dev->type;
683 }
684
685 rv = dev_set_mac_address(new_active->dev, &saddr);
686 if (rv) {
687 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
688 -rv, new_active->dev->name);
689 goto out;
690 }
691
692 if (!old_active)
693 goto out;
694
695 ether_addr_copy(saddr.sa_data, tmp_mac);
696 saddr.sa_family = old_active->dev->type;
697
698 rv = dev_set_mac_address(old_active->dev, &saddr);
699 if (rv)
700 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
701 -rv, new_active->dev->name);
702 out:
703 break;
704 default:
705 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
706 bond->params.fail_over_mac);
707 break;
708 }
709
710 }
711
712 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
713 {
714 struct slave *prim = rtnl_dereference(bond->primary_slave);
715 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
716
717 if (!prim || prim->link != BOND_LINK_UP) {
718 if (!curr || curr->link != BOND_LINK_UP)
719 return NULL;
720 return curr;
721 }
722
723 if (bond->force_primary) {
724 bond->force_primary = false;
725 return prim;
726 }
727
728 if (!curr || curr->link != BOND_LINK_UP)
729 return prim;
730
731 /* At this point, prim and curr are both up */
732 switch (bond->params.primary_reselect) {
733 case BOND_PRI_RESELECT_ALWAYS:
734 return prim;
735 case BOND_PRI_RESELECT_BETTER:
736 if (prim->speed < curr->speed)
737 return curr;
738 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
739 return curr;
740 return prim;
741 case BOND_PRI_RESELECT_FAILURE:
742 return curr;
743 default:
744 netdev_err(bond->dev, "impossible primary_reselect %d\n",
745 bond->params.primary_reselect);
746 return curr;
747 }
748 }
749
750 /**
751 * bond_find_best_slave - select the best available slave to be the active one
752 * @bond: our bonding struct
753 */
754 static struct slave *bond_find_best_slave(struct bonding *bond)
755 {
756 struct slave *slave, *bestslave = NULL;
757 struct list_head *iter;
758 int mintime = bond->params.updelay;
759
760 slave = bond_choose_primary_or_current(bond);
761 if (slave)
762 return slave;
763
764 bond_for_each_slave(bond, slave, iter) {
765 if (slave->link == BOND_LINK_UP)
766 return slave;
767 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
768 slave->delay < mintime) {
769 mintime = slave->delay;
770 bestslave = slave;
771 }
772 }
773
774 return bestslave;
775 }
776
777 static bool bond_should_notify_peers(struct bonding *bond)
778 {
779 struct slave *slave;
780
781 rcu_read_lock();
782 slave = rcu_dereference(bond->curr_active_slave);
783 rcu_read_unlock();
784
785 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
786 slave ? slave->dev->name : "NULL");
787
788 if (!slave || !bond->send_peer_notif ||
789 !netif_carrier_ok(bond->dev) ||
790 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
791 return false;
792
793 return true;
794 }
795
796 /**
797 * change_active_interface - change the active slave into the specified one
798 * @bond: our bonding struct
799 * @new: the new slave to make the active one
800 *
801 * Set the new slave to the bond's settings and unset them on the old
802 * curr_active_slave.
803 * Setting include flags, mc-list, promiscuity, allmulti, etc.
804 *
805 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
806 * because it is apparently the best available slave we have, even though its
807 * updelay hasn't timed out yet.
808 *
809 * Caller must hold RTNL.
810 */
811 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
812 {
813 struct slave *old_active;
814
815 ASSERT_RTNL();
816
817 old_active = rtnl_dereference(bond->curr_active_slave);
818
819 if (old_active == new_active)
820 return;
821
822 if (new_active) {
823 new_active->last_link_up = jiffies;
824
825 if (new_active->link == BOND_LINK_BACK) {
826 if (bond_uses_primary(bond)) {
827 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
828 new_active->dev->name,
829 (bond->params.updelay - new_active->delay) * bond->params.miimon);
830 }
831
832 new_active->delay = 0;
833 bond_set_slave_link_state(new_active, BOND_LINK_UP,
834 BOND_SLAVE_NOTIFY_NOW);
835
836 if (BOND_MODE(bond) == BOND_MODE_8023AD)
837 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
838
839 if (bond_is_lb(bond))
840 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
841 } else {
842 if (bond_uses_primary(bond)) {
843 netdev_info(bond->dev, "making interface %s the new active one\n",
844 new_active->dev->name);
845 }
846 }
847 }
848
849 if (bond_uses_primary(bond))
850 bond_hw_addr_swap(bond, new_active, old_active);
851
852 if (bond_is_lb(bond)) {
853 bond_alb_handle_active_change(bond, new_active);
854 if (old_active)
855 bond_set_slave_inactive_flags(old_active,
856 BOND_SLAVE_NOTIFY_NOW);
857 if (new_active)
858 bond_set_slave_active_flags(new_active,
859 BOND_SLAVE_NOTIFY_NOW);
860 } else {
861 rcu_assign_pointer(bond->curr_active_slave, new_active);
862 }
863
864 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
865 if (old_active)
866 bond_set_slave_inactive_flags(old_active,
867 BOND_SLAVE_NOTIFY_NOW);
868
869 if (new_active) {
870 bool should_notify_peers = false;
871
872 bond_set_slave_active_flags(new_active,
873 BOND_SLAVE_NOTIFY_NOW);
874
875 if (bond->params.fail_over_mac)
876 bond_do_fail_over_mac(bond, new_active,
877 old_active);
878
879 if (netif_running(bond->dev)) {
880 bond->send_peer_notif =
881 bond->params.num_peer_notif;
882 should_notify_peers =
883 bond_should_notify_peers(bond);
884 }
885
886 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
887 if (should_notify_peers)
888 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
889 bond->dev);
890 }
891 }
892
893 /* resend IGMP joins since active slave has changed or
894 * all were sent on curr_active_slave.
895 * resend only if bond is brought up with the affected
896 * bonding modes and the retransmission is enabled
897 */
898 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
899 ((bond_uses_primary(bond) && new_active) ||
900 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
901 bond->igmp_retrans = bond->params.resend_igmp;
902 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
903 }
904 }
905
906 /**
907 * bond_select_active_slave - select a new active slave, if needed
908 * @bond: our bonding struct
909 *
910 * This functions should be called when one of the following occurs:
911 * - The old curr_active_slave has been released or lost its link.
912 * - The primary_slave has got its link back.
913 * - A slave has got its link back and there's no old curr_active_slave.
914 *
915 * Caller must hold RTNL.
916 */
917 void bond_select_active_slave(struct bonding *bond)
918 {
919 struct slave *best_slave;
920 int rv;
921
922 ASSERT_RTNL();
923
924 best_slave = bond_find_best_slave(bond);
925 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
926 bond_change_active_slave(bond, best_slave);
927 rv = bond_set_carrier(bond);
928 if (!rv)
929 return;
930
931 if (netif_carrier_ok(bond->dev)) {
932 netdev_info(bond->dev, "first active interface up!\n");
933 } else {
934 netdev_info(bond->dev, "now running without any active interface!\n");
935 }
936 }
937 }
938
939 #ifdef CONFIG_NET_POLL_CONTROLLER
940 static inline int slave_enable_netpoll(struct slave *slave)
941 {
942 struct netpoll *np;
943 int err = 0;
944
945 np = kzalloc(sizeof(*np), GFP_KERNEL);
946 err = -ENOMEM;
947 if (!np)
948 goto out;
949
950 err = __netpoll_setup(np, slave->dev);
951 if (err) {
952 kfree(np);
953 goto out;
954 }
955 slave->np = np;
956 out:
957 return err;
958 }
959 static inline void slave_disable_netpoll(struct slave *slave)
960 {
961 struct netpoll *np = slave->np;
962
963 if (!np)
964 return;
965
966 slave->np = NULL;
967 __netpoll_free_async(np);
968 }
969
970 static void bond_poll_controller(struct net_device *bond_dev)
971 {
972 struct bonding *bond = netdev_priv(bond_dev);
973 struct slave *slave = NULL;
974 struct list_head *iter;
975 struct ad_info ad_info;
976 struct netpoll_info *ni;
977 const struct net_device_ops *ops;
978
979 if (BOND_MODE(bond) == BOND_MODE_8023AD)
980 if (bond_3ad_get_active_agg_info(bond, &ad_info))
981 return;
982
983 bond_for_each_slave_rcu(bond, slave, iter) {
984 ops = slave->dev->netdev_ops;
985 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
986 continue;
987
988 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
989 struct aggregator *agg =
990 SLAVE_AD_INFO(slave)->port.aggregator;
991
992 if (agg &&
993 agg->aggregator_identifier != ad_info.aggregator_id)
994 continue;
995 }
996
997 ni = rcu_dereference_bh(slave->dev->npinfo);
998 if (down_trylock(&ni->dev_lock))
999 continue;
1000 ops->ndo_poll_controller(slave->dev);
1001 up(&ni->dev_lock);
1002 }
1003 }
1004
1005 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1006 {
1007 struct bonding *bond = netdev_priv(bond_dev);
1008 struct list_head *iter;
1009 struct slave *slave;
1010
1011 bond_for_each_slave(bond, slave, iter)
1012 if (bond_slave_is_up(slave))
1013 slave_disable_netpoll(slave);
1014 }
1015
1016 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1017 {
1018 struct bonding *bond = netdev_priv(dev);
1019 struct list_head *iter;
1020 struct slave *slave;
1021 int err = 0;
1022
1023 bond_for_each_slave(bond, slave, iter) {
1024 err = slave_enable_netpoll(slave);
1025 if (err) {
1026 bond_netpoll_cleanup(dev);
1027 break;
1028 }
1029 }
1030 return err;
1031 }
1032 #else
1033 static inline int slave_enable_netpoll(struct slave *slave)
1034 {
1035 return 0;
1036 }
1037 static inline void slave_disable_netpoll(struct slave *slave)
1038 {
1039 }
1040 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1041 {
1042 }
1043 #endif
1044
1045 /*---------------------------------- IOCTL ----------------------------------*/
1046
1047 static netdev_features_t bond_fix_features(struct net_device *dev,
1048 netdev_features_t features)
1049 {
1050 struct bonding *bond = netdev_priv(dev);
1051 struct list_head *iter;
1052 netdev_features_t mask;
1053 struct slave *slave;
1054
1055 mask = features;
1056
1057 features &= ~NETIF_F_ONE_FOR_ALL;
1058 features |= NETIF_F_ALL_FOR_ALL;
1059
1060 bond_for_each_slave(bond, slave, iter) {
1061 features = netdev_increment_features(features,
1062 slave->dev->features,
1063 mask);
1064 }
1065 features = netdev_add_tso_features(features, mask);
1066
1067 return features;
1068 }
1069
1070 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1071 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1072 NETIF_F_HIGHDMA | NETIF_F_LRO)
1073
1074 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1075 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1076
1077 static void bond_compute_features(struct bonding *bond)
1078 {
1079 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1080 IFF_XMIT_DST_RELEASE_PERM;
1081 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1082 netdev_features_t enc_features = BOND_ENC_FEATURES;
1083 struct net_device *bond_dev = bond->dev;
1084 struct list_head *iter;
1085 struct slave *slave;
1086 unsigned short max_hard_header_len = ETH_HLEN;
1087 unsigned int gso_max_size = GSO_MAX_SIZE;
1088 u16 gso_max_segs = GSO_MAX_SEGS;
1089
1090 if (!bond_has_slaves(bond))
1091 goto done;
1092 vlan_features &= NETIF_F_ALL_FOR_ALL;
1093
1094 bond_for_each_slave(bond, slave, iter) {
1095 vlan_features = netdev_increment_features(vlan_features,
1096 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1097
1098 enc_features = netdev_increment_features(enc_features,
1099 slave->dev->hw_enc_features,
1100 BOND_ENC_FEATURES);
1101 dst_release_flag &= slave->dev->priv_flags;
1102 if (slave->dev->hard_header_len > max_hard_header_len)
1103 max_hard_header_len = slave->dev->hard_header_len;
1104
1105 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1106 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1107 }
1108
1109 done:
1110 bond_dev->vlan_features = vlan_features;
1111 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1112 bond_dev->hard_header_len = max_hard_header_len;
1113 bond_dev->gso_max_segs = gso_max_segs;
1114 netif_set_gso_max_size(bond_dev, gso_max_size);
1115
1116 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1117 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1118 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1119 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1120
1121 netdev_change_features(bond_dev);
1122 }
1123
1124 static void bond_setup_by_slave(struct net_device *bond_dev,
1125 struct net_device *slave_dev)
1126 {
1127 bond_dev->header_ops = slave_dev->header_ops;
1128
1129 bond_dev->type = slave_dev->type;
1130 bond_dev->hard_header_len = slave_dev->hard_header_len;
1131 bond_dev->addr_len = slave_dev->addr_len;
1132
1133 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1134 slave_dev->addr_len);
1135 }
1136
1137 /* On bonding slaves other than the currently active slave, suppress
1138 * duplicates except for alb non-mcast/bcast.
1139 */
1140 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1141 struct slave *slave,
1142 struct bonding *bond)
1143 {
1144 if (bond_is_slave_inactive(slave)) {
1145 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1146 skb->pkt_type != PACKET_BROADCAST &&
1147 skb->pkt_type != PACKET_MULTICAST)
1148 return false;
1149 return true;
1150 }
1151 return false;
1152 }
1153
1154 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1155 {
1156 struct sk_buff *skb = *pskb;
1157 struct slave *slave;
1158 struct bonding *bond;
1159 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1160 struct slave *);
1161 int ret = RX_HANDLER_ANOTHER;
1162
1163 skb = skb_share_check(skb, GFP_ATOMIC);
1164 if (unlikely(!skb))
1165 return RX_HANDLER_CONSUMED;
1166
1167 *pskb = skb;
1168
1169 slave = bond_slave_get_rcu(skb->dev);
1170 bond = slave->bond;
1171
1172 recv_probe = ACCESS_ONCE(bond->recv_probe);
1173 if (recv_probe) {
1174 ret = recv_probe(skb, bond, slave);
1175 if (ret == RX_HANDLER_CONSUMED) {
1176 consume_skb(skb);
1177 return ret;
1178 }
1179 }
1180
1181 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1182 return RX_HANDLER_EXACT;
1183 }
1184
1185 skb->dev = bond->dev;
1186
1187 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1188 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1189 skb->pkt_type == PACKET_HOST) {
1190
1191 if (unlikely(skb_cow_head(skb,
1192 skb->data - skb_mac_header(skb)))) {
1193 kfree_skb(skb);
1194 return RX_HANDLER_CONSUMED;
1195 }
1196 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1197 }
1198
1199 return ret;
1200 }
1201
1202 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1203 {
1204 switch (BOND_MODE(bond)) {
1205 case BOND_MODE_ROUNDROBIN:
1206 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1207 case BOND_MODE_ACTIVEBACKUP:
1208 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1209 case BOND_MODE_BROADCAST:
1210 return NETDEV_LAG_TX_TYPE_BROADCAST;
1211 case BOND_MODE_XOR:
1212 case BOND_MODE_8023AD:
1213 return NETDEV_LAG_TX_TYPE_HASH;
1214 default:
1215 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1216 }
1217 }
1218
1219 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave)
1220 {
1221 struct netdev_lag_upper_info lag_upper_info;
1222 int err;
1223
1224 lag_upper_info.tx_type = bond_lag_tx_type(bond);
1225 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1226 &lag_upper_info);
1227 if (err)
1228 return err;
1229 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1230 return 0;
1231 }
1232
1233 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1234 {
1235 netdev_upper_dev_unlink(slave->dev, bond->dev);
1236 slave->dev->flags &= ~IFF_SLAVE;
1237 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1238 }
1239
1240 static struct slave *bond_alloc_slave(struct bonding *bond)
1241 {
1242 struct slave *slave = NULL;
1243
1244 slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1245 if (!slave)
1246 return NULL;
1247
1248 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1249 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1250 GFP_KERNEL);
1251 if (!SLAVE_AD_INFO(slave)) {
1252 kfree(slave);
1253 return NULL;
1254 }
1255 }
1256 return slave;
1257 }
1258
1259 static void bond_free_slave(struct slave *slave)
1260 {
1261 struct bonding *bond = bond_get_bond_by_slave(slave);
1262
1263 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1264 kfree(SLAVE_AD_INFO(slave));
1265
1266 kfree(slave);
1267 }
1268
1269 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1270 {
1271 info->bond_mode = BOND_MODE(bond);
1272 info->miimon = bond->params.miimon;
1273 info->num_slaves = bond->slave_cnt;
1274 }
1275
1276 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1277 {
1278 strcpy(info->slave_name, slave->dev->name);
1279 info->link = slave->link;
1280 info->state = bond_slave_state(slave);
1281 info->link_failure_count = slave->link_failure_count;
1282 }
1283
1284 static void bond_netdev_notify(struct net_device *dev,
1285 struct netdev_bonding_info *info)
1286 {
1287 rtnl_lock();
1288 netdev_bonding_info_change(dev, info);
1289 rtnl_unlock();
1290 }
1291
1292 static void bond_netdev_notify_work(struct work_struct *_work)
1293 {
1294 struct netdev_notify_work *w =
1295 container_of(_work, struct netdev_notify_work, work.work);
1296
1297 bond_netdev_notify(w->dev, &w->bonding_info);
1298 dev_put(w->dev);
1299 kfree(w);
1300 }
1301
1302 void bond_queue_slave_event(struct slave *slave)
1303 {
1304 struct bonding *bond = slave->bond;
1305 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1306
1307 if (!nnw)
1308 return;
1309
1310 dev_hold(slave->dev);
1311 nnw->dev = slave->dev;
1312 bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1313 bond_fill_ifbond(bond, &nnw->bonding_info.master);
1314 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1315
1316 queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1317 }
1318
1319 void bond_lower_state_changed(struct slave *slave)
1320 {
1321 struct netdev_lag_lower_state_info info;
1322
1323 info.link_up = slave->link == BOND_LINK_UP ||
1324 slave->link == BOND_LINK_FAIL;
1325 info.tx_enabled = bond_is_active_slave(slave);
1326 netdev_lower_state_changed(slave->dev, &info);
1327 }
1328
1329 /* enslave device <slave> to bond device <master> */
1330 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1331 {
1332 struct bonding *bond = netdev_priv(bond_dev);
1333 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1334 struct slave *new_slave = NULL, *prev_slave;
1335 struct sockaddr addr;
1336 int link_reporting;
1337 int res = 0, i;
1338
1339 if (!bond->params.use_carrier &&
1340 slave_dev->ethtool_ops->get_link == NULL &&
1341 slave_ops->ndo_do_ioctl == NULL) {
1342 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1343 slave_dev->name);
1344 }
1345
1346 /* already enslaved */
1347 if (slave_dev->flags & IFF_SLAVE) {
1348 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1349 return -EBUSY;
1350 }
1351
1352 if (bond_dev == slave_dev) {
1353 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1354 return -EPERM;
1355 }
1356
1357 /* vlan challenged mutual exclusion */
1358 /* no need to lock since we're protected by rtnl_lock */
1359 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1360 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1361 slave_dev->name);
1362 if (vlan_uses_dev(bond_dev)) {
1363 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1364 slave_dev->name, bond_dev->name);
1365 return -EPERM;
1366 } else {
1367 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1368 slave_dev->name, slave_dev->name,
1369 bond_dev->name);
1370 }
1371 } else {
1372 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1373 slave_dev->name);
1374 }
1375
1376 /* Old ifenslave binaries are no longer supported. These can
1377 * be identified with moderate accuracy by the state of the slave:
1378 * the current ifenslave will set the interface down prior to
1379 * enslaving it; the old ifenslave will not.
1380 */
1381 if (slave_dev->flags & IFF_UP) {
1382 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1383 slave_dev->name);
1384 res = -EPERM;
1385 goto err_undo_flags;
1386 }
1387
1388 /* set bonding device ether type by slave - bonding netdevices are
1389 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1390 * there is a need to override some of the type dependent attribs/funcs.
1391 *
1392 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1393 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1394 */
1395 if (!bond_has_slaves(bond)) {
1396 if (bond_dev->type != slave_dev->type) {
1397 netdev_dbg(bond_dev, "change device type from %d to %d\n",
1398 bond_dev->type, slave_dev->type);
1399
1400 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1401 bond_dev);
1402 res = notifier_to_errno(res);
1403 if (res) {
1404 netdev_err(bond_dev, "refused to change device type\n");
1405 res = -EBUSY;
1406 goto err_undo_flags;
1407 }
1408
1409 /* Flush unicast and multicast addresses */
1410 dev_uc_flush(bond_dev);
1411 dev_mc_flush(bond_dev);
1412
1413 if (slave_dev->type != ARPHRD_ETHER)
1414 bond_setup_by_slave(bond_dev, slave_dev);
1415 else {
1416 ether_setup(bond_dev);
1417 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1418 }
1419
1420 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1421 bond_dev);
1422 }
1423 } else if (bond_dev->type != slave_dev->type) {
1424 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1425 slave_dev->name, slave_dev->type, bond_dev->type);
1426 res = -EINVAL;
1427 goto err_undo_flags;
1428 }
1429
1430 if (slave_ops->ndo_set_mac_address == NULL) {
1431 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1432 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1433 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1434 if (!bond_has_slaves(bond)) {
1435 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1436 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1437 } else {
1438 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");
1439 res = -EOPNOTSUPP;
1440 goto err_undo_flags;
1441 }
1442 }
1443 }
1444
1445 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1446
1447 /* If this is the first slave, then we need to set the master's hardware
1448 * address to be the same as the slave's.
1449 */
1450 if (!bond_has_slaves(bond) &&
1451 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1452 bond_set_dev_addr(bond->dev, slave_dev);
1453
1454 new_slave = bond_alloc_slave(bond);
1455 if (!new_slave) {
1456 res = -ENOMEM;
1457 goto err_undo_flags;
1458 }
1459
1460 new_slave->bond = bond;
1461 new_slave->dev = slave_dev;
1462 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1463 * is set via sysfs or module option if desired.
1464 */
1465 new_slave->queue_id = 0;
1466
1467 /* Save slave's original mtu and then set it to match the bond */
1468 new_slave->original_mtu = slave_dev->mtu;
1469 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1470 if (res) {
1471 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1472 goto err_free;
1473 }
1474
1475 /* Save slave's original ("permanent") mac address for modes
1476 * that need it, and for restoring it upon release, and then
1477 * set it to the master's address
1478 */
1479 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1480
1481 if (!bond->params.fail_over_mac ||
1482 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1483 /* Set slave to master's mac address. The application already
1484 * set the master's mac address to that of the first slave
1485 */
1486 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1487 addr.sa_family = slave_dev->type;
1488 res = dev_set_mac_address(slave_dev, &addr);
1489 if (res) {
1490 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1491 goto err_restore_mtu;
1492 }
1493 }
1494
1495 /* set slave flag before open to prevent IPv6 addrconf */
1496 slave_dev->flags |= IFF_SLAVE;
1497
1498 /* open the slave since the application closed it */
1499 res = dev_open(slave_dev);
1500 if (res) {
1501 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1502 goto err_restore_mac;
1503 }
1504
1505 slave_dev->priv_flags |= IFF_BONDING;
1506 /* initialize slave stats */
1507 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1508
1509 if (bond_is_lb(bond)) {
1510 /* bond_alb_init_slave() must be called before all other stages since
1511 * it might fail and we do not want to have to undo everything
1512 */
1513 res = bond_alb_init_slave(bond, new_slave);
1514 if (res)
1515 goto err_close;
1516 }
1517
1518 /* If the mode uses primary, then the following is handled by
1519 * bond_change_active_slave().
1520 */
1521 if (!bond_uses_primary(bond)) {
1522 /* set promiscuity level to new slave */
1523 if (bond_dev->flags & IFF_PROMISC) {
1524 res = dev_set_promiscuity(slave_dev, 1);
1525 if (res)
1526 goto err_close;
1527 }
1528
1529 /* set allmulti level to new slave */
1530 if (bond_dev->flags & IFF_ALLMULTI) {
1531 res = dev_set_allmulti(slave_dev, 1);
1532 if (res)
1533 goto err_close;
1534 }
1535
1536 netif_addr_lock_bh(bond_dev);
1537
1538 dev_mc_sync_multiple(slave_dev, bond_dev);
1539 dev_uc_sync_multiple(slave_dev, bond_dev);
1540
1541 netif_addr_unlock_bh(bond_dev);
1542 }
1543
1544 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1545 /* add lacpdu mc addr to mc list */
1546 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1547
1548 dev_mc_add(slave_dev, lacpdu_multicast);
1549 }
1550
1551 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1552 if (res) {
1553 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1554 slave_dev->name);
1555 goto err_close;
1556 }
1557
1558 prev_slave = bond_last_slave(bond);
1559
1560 new_slave->delay = 0;
1561 new_slave->link_failure_count = 0;
1562
1563 bond_update_speed_duplex(new_slave);
1564
1565 new_slave->last_rx = jiffies -
1566 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1567 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1568 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1569
1570 if (bond->params.miimon && !bond->params.use_carrier) {
1571 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1572
1573 if ((link_reporting == -1) && !bond->params.arp_interval) {
1574 /* miimon is set but a bonded network driver
1575 * does not support ETHTOOL/MII and
1576 * arp_interval is not set. Note: if
1577 * use_carrier is enabled, we will never go
1578 * here (because netif_carrier is always
1579 * supported); thus, we don't need to change
1580 * the messages for netif_carrier.
1581 */
1582 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",
1583 slave_dev->name);
1584 } else if (link_reporting == -1) {
1585 /* unable get link status using mii/ethtool */
1586 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",
1587 slave_dev->name);
1588 }
1589 }
1590
1591 /* check for initial state */
1592 if (bond->params.miimon) {
1593 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1594 if (bond->params.updelay) {
1595 bond_set_slave_link_state(new_slave,
1596 BOND_LINK_BACK,
1597 BOND_SLAVE_NOTIFY_NOW);
1598 new_slave->delay = bond->params.updelay;
1599 } else {
1600 bond_set_slave_link_state(new_slave,
1601 BOND_LINK_UP,
1602 BOND_SLAVE_NOTIFY_NOW);
1603 }
1604 } else {
1605 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1606 BOND_SLAVE_NOTIFY_NOW);
1607 }
1608 } else if (bond->params.arp_interval) {
1609 bond_set_slave_link_state(new_slave,
1610 (netif_carrier_ok(slave_dev) ?
1611 BOND_LINK_UP : BOND_LINK_DOWN),
1612 BOND_SLAVE_NOTIFY_NOW);
1613 } else {
1614 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1615 BOND_SLAVE_NOTIFY_NOW);
1616 }
1617
1618 if (new_slave->link != BOND_LINK_DOWN)
1619 new_slave->last_link_up = jiffies;
1620 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1621 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1622 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1623
1624 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1625 /* if there is a primary slave, remember it */
1626 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1627 rcu_assign_pointer(bond->primary_slave, new_slave);
1628 bond->force_primary = true;
1629 }
1630 }
1631
1632 switch (BOND_MODE(bond)) {
1633 case BOND_MODE_ACTIVEBACKUP:
1634 bond_set_slave_inactive_flags(new_slave,
1635 BOND_SLAVE_NOTIFY_NOW);
1636 break;
1637 case BOND_MODE_8023AD:
1638 /* in 802.3ad mode, the internal mechanism
1639 * will activate the slaves in the selected
1640 * aggregator
1641 */
1642 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1643 /* if this is the first slave */
1644 if (!prev_slave) {
1645 SLAVE_AD_INFO(new_slave)->id = 1;
1646 /* Initialize AD with the number of times that the AD timer is called in 1 second
1647 * can be called only after the mac address of the bond is set
1648 */
1649 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1650 } else {
1651 SLAVE_AD_INFO(new_slave)->id =
1652 SLAVE_AD_INFO(prev_slave)->id + 1;
1653 }
1654
1655 bond_3ad_bind_slave(new_slave);
1656 break;
1657 case BOND_MODE_TLB:
1658 case BOND_MODE_ALB:
1659 bond_set_active_slave(new_slave);
1660 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1661 break;
1662 default:
1663 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1664
1665 /* always active in trunk mode */
1666 bond_set_active_slave(new_slave);
1667
1668 /* In trunking mode there is little meaning to curr_active_slave
1669 * anyway (it holds no special properties of the bond device),
1670 * so we can change it without calling change_active_interface()
1671 */
1672 if (!rcu_access_pointer(bond->curr_active_slave) &&
1673 new_slave->link == BOND_LINK_UP)
1674 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1675
1676 break;
1677 } /* switch(bond_mode) */
1678
1679 #ifdef CONFIG_NET_POLL_CONTROLLER
1680 slave_dev->npinfo = bond->dev->npinfo;
1681 if (slave_dev->npinfo) {
1682 if (slave_enable_netpoll(new_slave)) {
1683 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1684 res = -EBUSY;
1685 goto err_detach;
1686 }
1687 }
1688 #endif
1689
1690 if (!(bond_dev->features & NETIF_F_LRO))
1691 dev_disable_lro(slave_dev);
1692
1693 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1694 new_slave);
1695 if (res) {
1696 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1697 goto err_detach;
1698 }
1699
1700 res = bond_master_upper_dev_link(bond, new_slave);
1701 if (res) {
1702 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1703 goto err_unregister;
1704 }
1705
1706 res = bond_sysfs_slave_add(new_slave);
1707 if (res) {
1708 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1709 goto err_upper_unlink;
1710 }
1711
1712 bond->slave_cnt++;
1713 bond_compute_features(bond);
1714 bond_set_carrier(bond);
1715
1716 if (bond_uses_primary(bond)) {
1717 block_netpoll_tx();
1718 bond_select_active_slave(bond);
1719 unblock_netpoll_tx();
1720 }
1721
1722 if (bond_mode_uses_xmit_hash(bond))
1723 bond_update_slave_arr(bond, NULL);
1724
1725 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1726 slave_dev->name,
1727 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1728 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1729
1730 /* enslave is successful */
1731 bond_queue_slave_event(new_slave);
1732 return 0;
1733
1734 /* Undo stages on error */
1735 err_upper_unlink:
1736 bond_upper_dev_unlink(bond, new_slave);
1737
1738 err_unregister:
1739 netdev_rx_handler_unregister(slave_dev);
1740
1741 err_detach:
1742 if (!bond_uses_primary(bond))
1743 bond_hw_addr_flush(bond_dev, slave_dev);
1744
1745 vlan_vids_del_by_dev(slave_dev, bond_dev);
1746 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1747 RCU_INIT_POINTER(bond->primary_slave, NULL);
1748 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1749 block_netpoll_tx();
1750 bond_change_active_slave(bond, NULL);
1751 bond_select_active_slave(bond);
1752 unblock_netpoll_tx();
1753 }
1754 /* either primary_slave or curr_active_slave might've changed */
1755 synchronize_rcu();
1756 slave_disable_netpoll(new_slave);
1757
1758 err_close:
1759 slave_dev->priv_flags &= ~IFF_BONDING;
1760 dev_close(slave_dev);
1761
1762 err_restore_mac:
1763 slave_dev->flags &= ~IFF_SLAVE;
1764 if (!bond->params.fail_over_mac ||
1765 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1766 /* XXX TODO - fom follow mode needs to change master's
1767 * MAC if this slave's MAC is in use by the bond, or at
1768 * least print a warning.
1769 */
1770 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1771 addr.sa_family = slave_dev->type;
1772 dev_set_mac_address(slave_dev, &addr);
1773 }
1774
1775 err_restore_mtu:
1776 dev_set_mtu(slave_dev, new_slave->original_mtu);
1777
1778 err_free:
1779 bond_free_slave(new_slave);
1780
1781 err_undo_flags:
1782 /* Enslave of first slave has failed and we need to fix master's mac */
1783 if (!bond_has_slaves(bond)) {
1784 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1785 slave_dev->dev_addr))
1786 eth_hw_addr_random(bond_dev);
1787 if (bond_dev->type != ARPHRD_ETHER) {
1788 dev_close(bond_dev);
1789 ether_setup(bond_dev);
1790 bond_dev->flags |= IFF_MASTER;
1791 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1792 }
1793 }
1794
1795 return res;
1796 }
1797
1798 /* Try to release the slave device <slave> from the bond device <master>
1799 * It is legal to access curr_active_slave without a lock because all the function
1800 * is RTNL-locked. If "all" is true it means that the function is being called
1801 * while destroying a bond interface and all slaves are being released.
1802 *
1803 * The rules for slave state should be:
1804 * for Active/Backup:
1805 * Active stays on all backups go down
1806 * for Bonded connections:
1807 * The first up interface should be left on and all others downed.
1808 */
1809 static int __bond_release_one(struct net_device *bond_dev,
1810 struct net_device *slave_dev,
1811 bool all)
1812 {
1813 struct bonding *bond = netdev_priv(bond_dev);
1814 struct slave *slave, *oldcurrent;
1815 struct sockaddr addr;
1816 int old_flags = bond_dev->flags;
1817 netdev_features_t old_features = bond_dev->features;
1818
1819 /* slave is not a slave or master is not master of this slave */
1820 if (!(slave_dev->flags & IFF_SLAVE) ||
1821 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1822 netdev_dbg(bond_dev, "cannot release %s\n",
1823 slave_dev->name);
1824 return -EINVAL;
1825 }
1826
1827 block_netpoll_tx();
1828
1829 slave = bond_get_slave_by_dev(bond, slave_dev);
1830 if (!slave) {
1831 /* not a slave of this bond */
1832 netdev_info(bond_dev, "%s not enslaved\n",
1833 slave_dev->name);
1834 unblock_netpoll_tx();
1835 return -EINVAL;
1836 }
1837
1838 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1839
1840 bond_sysfs_slave_del(slave);
1841
1842 /* recompute stats just before removing the slave */
1843 bond_get_stats(bond->dev, &bond->bond_stats);
1844
1845 bond_upper_dev_unlink(bond, slave);
1846 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1847 * for this slave anymore.
1848 */
1849 netdev_rx_handler_unregister(slave_dev);
1850
1851 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1852 bond_3ad_unbind_slave(slave);
1853
1854 if (bond_mode_uses_xmit_hash(bond))
1855 bond_update_slave_arr(bond, slave);
1856
1857 netdev_info(bond_dev, "Releasing %s interface %s\n",
1858 bond_is_active_slave(slave) ? "active" : "backup",
1859 slave_dev->name);
1860
1861 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1862
1863 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1864
1865 if (!all && (!bond->params.fail_over_mac ||
1866 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1867 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1868 bond_has_slaves(bond))
1869 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",
1870 slave_dev->name, slave->perm_hwaddr,
1871 bond_dev->name, slave_dev->name);
1872 }
1873
1874 if (rtnl_dereference(bond->primary_slave) == slave)
1875 RCU_INIT_POINTER(bond->primary_slave, NULL);
1876
1877 if (oldcurrent == slave)
1878 bond_change_active_slave(bond, NULL);
1879
1880 if (bond_is_lb(bond)) {
1881 /* Must be called only after the slave has been
1882 * detached from the list and the curr_active_slave
1883 * has been cleared (if our_slave == old_current),
1884 * but before a new active slave is selected.
1885 */
1886 bond_alb_deinit_slave(bond, slave);
1887 }
1888
1889 if (all) {
1890 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1891 } else if (oldcurrent == slave) {
1892 /* Note that we hold RTNL over this sequence, so there
1893 * is no concern that another slave add/remove event
1894 * will interfere.
1895 */
1896 bond_select_active_slave(bond);
1897 }
1898
1899 if (!bond_has_slaves(bond)) {
1900 bond_set_carrier(bond);
1901 eth_hw_addr_random(bond_dev);
1902 }
1903
1904 unblock_netpoll_tx();
1905 synchronize_rcu();
1906 bond->slave_cnt--;
1907
1908 if (!bond_has_slaves(bond)) {
1909 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1910 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1911 }
1912
1913 bond_compute_features(bond);
1914 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1915 (old_features & NETIF_F_VLAN_CHALLENGED))
1916 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1917 slave_dev->name, bond_dev->name);
1918
1919 vlan_vids_del_by_dev(slave_dev, bond_dev);
1920
1921 /* If the mode uses primary, then this case was handled above by
1922 * bond_change_active_slave(..., NULL)
1923 */
1924 if (!bond_uses_primary(bond)) {
1925 /* unset promiscuity level from slave
1926 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1927 * of the IFF_PROMISC flag in the bond_dev, but we need the
1928 * value of that flag before that change, as that was the value
1929 * when this slave was attached, so we cache at the start of the
1930 * function and use it here. Same goes for ALLMULTI below
1931 */
1932 if (old_flags & IFF_PROMISC)
1933 dev_set_promiscuity(slave_dev, -1);
1934
1935 /* unset allmulti level from slave */
1936 if (old_flags & IFF_ALLMULTI)
1937 dev_set_allmulti(slave_dev, -1);
1938
1939 bond_hw_addr_flush(bond_dev, slave_dev);
1940 }
1941
1942 slave_disable_netpoll(slave);
1943
1944 /* close slave before restoring its mac address */
1945 dev_close(slave_dev);
1946
1947 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1948 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1949 /* restore original ("permanent") mac address */
1950 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1951 addr.sa_family = slave_dev->type;
1952 dev_set_mac_address(slave_dev, &addr);
1953 }
1954
1955 dev_set_mtu(slave_dev, slave->original_mtu);
1956
1957 slave_dev->priv_flags &= ~IFF_BONDING;
1958
1959 bond_free_slave(slave);
1960
1961 return 0;
1962 }
1963
1964 /* A wrapper used because of ndo_del_link */
1965 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1966 {
1967 return __bond_release_one(bond_dev, slave_dev, false);
1968 }
1969
1970 /* First release a slave and then destroy the bond if no more slaves are left.
1971 * Must be under rtnl_lock when this function is called.
1972 */
1973 static int bond_release_and_destroy(struct net_device *bond_dev,
1974 struct net_device *slave_dev)
1975 {
1976 struct bonding *bond = netdev_priv(bond_dev);
1977 int ret;
1978
1979 ret = bond_release(bond_dev, slave_dev);
1980 if (ret == 0 && !bond_has_slaves(bond)) {
1981 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1982 netdev_info(bond_dev, "Destroying bond %s\n",
1983 bond_dev->name);
1984 bond_remove_proc_entry(bond);
1985 unregister_netdevice(bond_dev);
1986 }
1987 return ret;
1988 }
1989
1990 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1991 {
1992 struct bonding *bond = netdev_priv(bond_dev);
1993 bond_fill_ifbond(bond, info);
1994 return 0;
1995 }
1996
1997 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1998 {
1999 struct bonding *bond = netdev_priv(bond_dev);
2000 struct list_head *iter;
2001 int i = 0, res = -ENODEV;
2002 struct slave *slave;
2003
2004 bond_for_each_slave(bond, slave, iter) {
2005 if (i++ == (int)info->slave_id) {
2006 res = 0;
2007 bond_fill_ifslave(slave, info);
2008 break;
2009 }
2010 }
2011
2012 return res;
2013 }
2014
2015 /*-------------------------------- Monitoring -------------------------------*/
2016
2017 /* called with rcu_read_lock() */
2018 static int bond_miimon_inspect(struct bonding *bond)
2019 {
2020 int link_state, commit = 0;
2021 struct list_head *iter;
2022 struct slave *slave;
2023 bool ignore_updelay;
2024
2025 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2026
2027 bond_for_each_slave_rcu(bond, slave, iter) {
2028 slave->new_link = BOND_LINK_NOCHANGE;
2029
2030 link_state = bond_check_dev_link(bond, slave->dev, 0);
2031
2032 switch (slave->link) {
2033 case BOND_LINK_UP:
2034 if (link_state)
2035 continue;
2036
2037 bond_set_slave_link_state(slave, BOND_LINK_FAIL,
2038 BOND_SLAVE_NOTIFY_LATER);
2039 slave->delay = bond->params.downdelay;
2040 if (slave->delay) {
2041 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2042 (BOND_MODE(bond) ==
2043 BOND_MODE_ACTIVEBACKUP) ?
2044 (bond_is_active_slave(slave) ?
2045 "active " : "backup ") : "",
2046 slave->dev->name,
2047 bond->params.downdelay * bond->params.miimon);
2048 }
2049 /*FALLTHRU*/
2050 case BOND_LINK_FAIL:
2051 if (link_state) {
2052 /* recovered before downdelay expired */
2053 bond_set_slave_link_state(slave, BOND_LINK_UP,
2054 BOND_SLAVE_NOTIFY_LATER);
2055 slave->last_link_up = jiffies;
2056 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2057 (bond->params.downdelay - slave->delay) *
2058 bond->params.miimon,
2059 slave->dev->name);
2060 continue;
2061 }
2062
2063 if (slave->delay <= 0) {
2064 slave->new_link = BOND_LINK_DOWN;
2065 commit++;
2066 continue;
2067 }
2068
2069 slave->delay--;
2070 break;
2071
2072 case BOND_LINK_DOWN:
2073 if (!link_state)
2074 continue;
2075
2076 bond_set_slave_link_state(slave, BOND_LINK_BACK,
2077 BOND_SLAVE_NOTIFY_LATER);
2078 slave->delay = bond->params.updelay;
2079
2080 if (slave->delay) {
2081 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2082 slave->dev->name,
2083 ignore_updelay ? 0 :
2084 bond->params.updelay *
2085 bond->params.miimon);
2086 }
2087 /*FALLTHRU*/
2088 case BOND_LINK_BACK:
2089 if (!link_state) {
2090 bond_set_slave_link_state(slave,
2091 BOND_LINK_DOWN,
2092 BOND_SLAVE_NOTIFY_LATER);
2093 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2094 (bond->params.updelay - slave->delay) *
2095 bond->params.miimon,
2096 slave->dev->name);
2097
2098 continue;
2099 }
2100
2101 if (ignore_updelay)
2102 slave->delay = 0;
2103
2104 if (slave->delay <= 0) {
2105 slave->new_link = BOND_LINK_UP;
2106 commit++;
2107 ignore_updelay = false;
2108 continue;
2109 }
2110
2111 slave->delay--;
2112 break;
2113 }
2114 }
2115
2116 return commit;
2117 }
2118
2119 static void bond_miimon_commit(struct bonding *bond)
2120 {
2121 struct list_head *iter;
2122 struct slave *slave, *primary;
2123
2124 bond_for_each_slave(bond, slave, iter) {
2125 switch (slave->new_link) {
2126 case BOND_LINK_NOCHANGE:
2127 continue;
2128
2129 case BOND_LINK_UP:
2130 bond_set_slave_link_state(slave, BOND_LINK_UP,
2131 BOND_SLAVE_NOTIFY_NOW);
2132 slave->last_link_up = jiffies;
2133
2134 primary = rtnl_dereference(bond->primary_slave);
2135 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2136 /* prevent it from being the active one */
2137 bond_set_backup_slave(slave);
2138 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2139 /* make it immediately active */
2140 bond_set_active_slave(slave);
2141 } else if (slave != primary) {
2142 /* prevent it from being the active one */
2143 bond_set_backup_slave(slave);
2144 }
2145
2146 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2147 slave->dev->name,
2148 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2149 slave->duplex ? "full" : "half");
2150
2151 /* notify ad that the link status has changed */
2152 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2153 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2154
2155 if (bond_is_lb(bond))
2156 bond_alb_handle_link_change(bond, slave,
2157 BOND_LINK_UP);
2158
2159 if (BOND_MODE(bond) == BOND_MODE_XOR)
2160 bond_update_slave_arr(bond, NULL);
2161
2162 if (!bond->curr_active_slave || slave == primary)
2163 goto do_failover;
2164
2165 continue;
2166
2167 case BOND_LINK_DOWN:
2168 if (slave->link_failure_count < UINT_MAX)
2169 slave->link_failure_count++;
2170
2171 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2172 BOND_SLAVE_NOTIFY_NOW);
2173
2174 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2175 BOND_MODE(bond) == BOND_MODE_8023AD)
2176 bond_set_slave_inactive_flags(slave,
2177 BOND_SLAVE_NOTIFY_NOW);
2178
2179 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2180 slave->dev->name);
2181
2182 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2183 bond_3ad_handle_link_change(slave,
2184 BOND_LINK_DOWN);
2185
2186 if (bond_is_lb(bond))
2187 bond_alb_handle_link_change(bond, slave,
2188 BOND_LINK_DOWN);
2189
2190 if (BOND_MODE(bond) == BOND_MODE_XOR)
2191 bond_update_slave_arr(bond, NULL);
2192
2193 if (slave == rcu_access_pointer(bond->curr_active_slave))
2194 goto do_failover;
2195
2196 continue;
2197
2198 default:
2199 netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2200 slave->new_link, slave->dev->name);
2201 slave->new_link = BOND_LINK_NOCHANGE;
2202
2203 continue;
2204 }
2205
2206 do_failover:
2207 block_netpoll_tx();
2208 bond_select_active_slave(bond);
2209 unblock_netpoll_tx();
2210 }
2211
2212 bond_set_carrier(bond);
2213 }
2214
2215 /* bond_mii_monitor
2216 *
2217 * Really a wrapper that splits the mii monitor into two phases: an
2218 * inspection, then (if inspection indicates something needs to be done)
2219 * an acquisition of appropriate locks followed by a commit phase to
2220 * implement whatever link state changes are indicated.
2221 */
2222 static void bond_mii_monitor(struct work_struct *work)
2223 {
2224 struct bonding *bond = container_of(work, struct bonding,
2225 mii_work.work);
2226 bool should_notify_peers = false;
2227 unsigned long delay;
2228
2229 delay = msecs_to_jiffies(bond->params.miimon);
2230
2231 if (!bond_has_slaves(bond))
2232 goto re_arm;
2233
2234 rcu_read_lock();
2235
2236 should_notify_peers = bond_should_notify_peers(bond);
2237
2238 if (bond_miimon_inspect(bond)) {
2239 rcu_read_unlock();
2240
2241 /* Race avoidance with bond_close cancel of workqueue */
2242 if (!rtnl_trylock()) {
2243 delay = 1;
2244 should_notify_peers = false;
2245 goto re_arm;
2246 }
2247
2248 bond_miimon_commit(bond);
2249
2250 rtnl_unlock(); /* might sleep, hold no other locks */
2251 } else
2252 rcu_read_unlock();
2253
2254 re_arm:
2255 if (bond->params.miimon)
2256 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2257
2258 if (should_notify_peers) {
2259 if (!rtnl_trylock())
2260 return;
2261 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2262 rtnl_unlock();
2263 }
2264 }
2265
2266 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2267 {
2268 struct net_device *upper;
2269 struct list_head *iter;
2270 bool ret = false;
2271
2272 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2273 return true;
2274
2275 rcu_read_lock();
2276 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2277 if (ip == bond_confirm_addr(upper, 0, ip)) {
2278 ret = true;
2279 break;
2280 }
2281 }
2282 rcu_read_unlock();
2283
2284 return ret;
2285 }
2286
2287 /* We go to the (large) trouble of VLAN tagging ARP frames because
2288 * switches in VLAN mode (especially if ports are configured as
2289 * "native" to a VLAN) might not pass non-tagged frames.
2290 */
2291 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2292 __be32 dest_ip, __be32 src_ip,
2293 struct bond_vlan_tag *tags)
2294 {
2295 struct sk_buff *skb;
2296 struct bond_vlan_tag *outer_tag = tags;
2297
2298 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2299 arp_op, slave_dev->name, &dest_ip, &src_ip);
2300
2301 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2302 NULL, slave_dev->dev_addr, NULL);
2303
2304 if (!skb) {
2305 net_err_ratelimited("ARP packet allocation failed\n");
2306 return;
2307 }
2308
2309 if (!tags || tags->vlan_proto == VLAN_N_VID)
2310 goto xmit;
2311
2312 tags++;
2313
2314 /* Go through all the tags backwards and add them to the packet */
2315 while (tags->vlan_proto != VLAN_N_VID) {
2316 if (!tags->vlan_id) {
2317 tags++;
2318 continue;
2319 }
2320
2321 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2322 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2323 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2324 tags->vlan_id);
2325 if (!skb) {
2326 net_err_ratelimited("failed to insert inner VLAN tag\n");
2327 return;
2328 }
2329
2330 tags++;
2331 }
2332 /* Set the outer tag */
2333 if (outer_tag->vlan_id) {
2334 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2335 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2336 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2337 outer_tag->vlan_id);
2338 }
2339
2340 xmit:
2341 arp_xmit(skb);
2342 }
2343
2344 /* Validate the device path between the @start_dev and the @end_dev.
2345 * The path is valid if the @end_dev is reachable through device
2346 * stacking.
2347 * When the path is validated, collect any vlan information in the
2348 * path.
2349 */
2350 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2351 struct net_device *end_dev,
2352 int level)
2353 {
2354 struct bond_vlan_tag *tags;
2355 struct net_device *upper;
2356 struct list_head *iter;
2357
2358 if (start_dev == end_dev) {
2359 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2360 if (!tags)
2361 return ERR_PTR(-ENOMEM);
2362 tags[level].vlan_proto = VLAN_N_VID;
2363 return tags;
2364 }
2365
2366 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2367 tags = bond_verify_device_path(upper, end_dev, level + 1);
2368 if (IS_ERR_OR_NULL(tags)) {
2369 if (IS_ERR(tags))
2370 return tags;
2371 continue;
2372 }
2373 if (is_vlan_dev(upper)) {
2374 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2375 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2376 }
2377
2378 return tags;
2379 }
2380
2381 return NULL;
2382 }
2383
2384 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2385 {
2386 struct rtable *rt;
2387 struct bond_vlan_tag *tags;
2388 __be32 *targets = bond->params.arp_targets, addr;
2389 int i;
2390
2391 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2392 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2393 tags = NULL;
2394
2395 /* Find out through which dev should the packet go */
2396 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2397 RTO_ONLINK, 0);
2398 if (IS_ERR(rt)) {
2399 /* there's no route to target - try to send arp
2400 * probe to generate any traffic (arp_validate=0)
2401 */
2402 if (bond->params.arp_validate)
2403 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2404 bond->dev->name,
2405 &targets[i]);
2406 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2407 0, tags);
2408 continue;
2409 }
2410
2411 /* bond device itself */
2412 if (rt->dst.dev == bond->dev)
2413 goto found;
2414
2415 rcu_read_lock();
2416 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2417 rcu_read_unlock();
2418
2419 if (!IS_ERR_OR_NULL(tags))
2420 goto found;
2421
2422 /* Not our device - skip */
2423 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2424 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2425
2426 ip_rt_put(rt);
2427 continue;
2428
2429 found:
2430 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2431 ip_rt_put(rt);
2432 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2433 addr, tags);
2434 kfree(tags);
2435 }
2436 }
2437
2438 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2439 {
2440 int i;
2441
2442 if (!sip || !bond_has_this_ip(bond, tip)) {
2443 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2444 &sip, &tip);
2445 return;
2446 }
2447
2448 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2449 if (i == -1) {
2450 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2451 &sip);
2452 return;
2453 }
2454 slave->last_rx = jiffies;
2455 slave->target_last_arp_rx[i] = jiffies;
2456 }
2457
2458 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2459 struct slave *slave)
2460 {
2461 struct arphdr *arp = (struct arphdr *)skb->data;
2462 struct slave *curr_active_slave;
2463 unsigned char *arp_ptr;
2464 __be32 sip, tip;
2465 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2466
2467 if (!slave_do_arp_validate(bond, slave)) {
2468 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2469 !slave_do_arp_validate_only(bond))
2470 slave->last_rx = jiffies;
2471 return RX_HANDLER_ANOTHER;
2472 } else if (!is_arp) {
2473 return RX_HANDLER_ANOTHER;
2474 }
2475
2476 alen = arp_hdr_len(bond->dev);
2477
2478 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2479 skb->dev->name);
2480
2481 if (alen > skb_headlen(skb)) {
2482 arp = kmalloc(alen, GFP_ATOMIC);
2483 if (!arp)
2484 goto out_unlock;
2485 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2486 goto out_unlock;
2487 }
2488
2489 if (arp->ar_hln != bond->dev->addr_len ||
2490 skb->pkt_type == PACKET_OTHERHOST ||
2491 skb->pkt_type == PACKET_LOOPBACK ||
2492 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2493 arp->ar_pro != htons(ETH_P_IP) ||
2494 arp->ar_pln != 4)
2495 goto out_unlock;
2496
2497 arp_ptr = (unsigned char *)(arp + 1);
2498 arp_ptr += bond->dev->addr_len;
2499 memcpy(&sip, arp_ptr, 4);
2500 arp_ptr += 4 + bond->dev->addr_len;
2501 memcpy(&tip, arp_ptr, 4);
2502
2503 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2504 slave->dev->name, bond_slave_state(slave),
2505 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2506 &sip, &tip);
2507
2508 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2509
2510 /* Backup slaves won't see the ARP reply, but do come through
2511 * here for each ARP probe (so we swap the sip/tip to validate
2512 * the probe). In a "redundant switch, common router" type of
2513 * configuration, the ARP probe will (hopefully) travel from
2514 * the active, through one switch, the router, then the other
2515 * switch before reaching the backup.
2516 *
2517 * We 'trust' the arp requests if there is an active slave and
2518 * it received valid arp reply(s) after it became active. This
2519 * is done to avoid endless looping when we can't reach the
2520 * arp_ip_target and fool ourselves with our own arp requests.
2521 */
2522
2523 if (bond_is_active_slave(slave))
2524 bond_validate_arp(bond, slave, sip, tip);
2525 else if (curr_active_slave &&
2526 time_after(slave_last_rx(bond, curr_active_slave),
2527 curr_active_slave->last_link_up))
2528 bond_validate_arp(bond, slave, tip, sip);
2529
2530 out_unlock:
2531 if (arp != (struct arphdr *)skb->data)
2532 kfree(arp);
2533 return RX_HANDLER_ANOTHER;
2534 }
2535
2536 /* function to verify if we're in the arp_interval timeslice, returns true if
2537 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2538 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2539 */
2540 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2541 int mod)
2542 {
2543 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2544
2545 return time_in_range(jiffies,
2546 last_act - delta_in_ticks,
2547 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2548 }
2549
2550 /* This function is called regularly to monitor each slave's link
2551 * ensuring that traffic is being sent and received when arp monitoring
2552 * is used in load-balancing mode. if the adapter has been dormant, then an
2553 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2554 * arp monitoring in active backup mode.
2555 */
2556 static void bond_loadbalance_arp_mon(struct work_struct *work)
2557 {
2558 struct bonding *bond = container_of(work, struct bonding,
2559 arp_work.work);
2560 struct slave *slave, *oldcurrent;
2561 struct list_head *iter;
2562 int do_failover = 0, slave_state_changed = 0;
2563
2564 if (!bond_has_slaves(bond))
2565 goto re_arm;
2566
2567 rcu_read_lock();
2568
2569 oldcurrent = rcu_dereference(bond->curr_active_slave);
2570 /* see if any of the previous devices are up now (i.e. they have
2571 * xmt and rcv traffic). the curr_active_slave does not come into
2572 * the picture unless it is null. also, slave->last_link_up is not
2573 * needed here because we send an arp on each slave and give a slave
2574 * as long as it needs to get the tx/rx within the delta.
2575 * TODO: what about up/down delay in arp mode? it wasn't here before
2576 * so it can wait
2577 */
2578 bond_for_each_slave_rcu(bond, slave, iter) {
2579 unsigned long trans_start = dev_trans_start(slave->dev);
2580
2581 if (slave->link != BOND_LINK_UP) {
2582 if (bond_time_in_interval(bond, trans_start, 1) &&
2583 bond_time_in_interval(bond, slave->last_rx, 1)) {
2584
2585 slave->link = BOND_LINK_UP;
2586 slave_state_changed = 1;
2587
2588 /* primary_slave has no meaning in round-robin
2589 * mode. the window of a slave being up and
2590 * curr_active_slave being null after enslaving
2591 * is closed.
2592 */
2593 if (!oldcurrent) {
2594 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2595 slave->dev->name);
2596 do_failover = 1;
2597 } else {
2598 netdev_info(bond->dev, "interface %s is now up\n",
2599 slave->dev->name);
2600 }
2601 }
2602 } else {
2603 /* slave->link == BOND_LINK_UP */
2604
2605 /* not all switches will respond to an arp request
2606 * when the source ip is 0, so don't take the link down
2607 * if we don't know our ip yet
2608 */
2609 if (!bond_time_in_interval(bond, trans_start, 2) ||
2610 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2611
2612 slave->link = BOND_LINK_DOWN;
2613 slave_state_changed = 1;
2614
2615 if (slave->link_failure_count < UINT_MAX)
2616 slave->link_failure_count++;
2617
2618 netdev_info(bond->dev, "interface %s is now down\n",
2619 slave->dev->name);
2620
2621 if (slave == oldcurrent)
2622 do_failover = 1;
2623 }
2624 }
2625
2626 /* note: if switch is in round-robin mode, all links
2627 * must tx arp to ensure all links rx an arp - otherwise
2628 * links may oscillate or not come up at all; if switch is
2629 * in something like xor mode, there is nothing we can
2630 * do - all replies will be rx'ed on same link causing slaves
2631 * to be unstable during low/no traffic periods
2632 */
2633 if (bond_slave_is_up(slave))
2634 bond_arp_send_all(bond, slave);
2635 }
2636
2637 rcu_read_unlock();
2638
2639 if (do_failover || slave_state_changed) {
2640 if (!rtnl_trylock())
2641 goto re_arm;
2642
2643 if (slave_state_changed) {
2644 bond_slave_state_change(bond);
2645 if (BOND_MODE(bond) == BOND_MODE_XOR)
2646 bond_update_slave_arr(bond, NULL);
2647 }
2648 if (do_failover) {
2649 block_netpoll_tx();
2650 bond_select_active_slave(bond);
2651 unblock_netpoll_tx();
2652 }
2653 rtnl_unlock();
2654 }
2655
2656 re_arm:
2657 if (bond->params.arp_interval)
2658 queue_delayed_work(bond->wq, &bond->arp_work,
2659 msecs_to_jiffies(bond->params.arp_interval));
2660 }
2661
2662 /* Called to inspect slaves for active-backup mode ARP monitor link state
2663 * changes. Sets new_link in slaves to specify what action should take
2664 * place for the slave. Returns 0 if no changes are found, >0 if changes
2665 * to link states must be committed.
2666 *
2667 * Called with rcu_read_lock held.
2668 */
2669 static int bond_ab_arp_inspect(struct bonding *bond)
2670 {
2671 unsigned long trans_start, last_rx;
2672 struct list_head *iter;
2673 struct slave *slave;
2674 int commit = 0;
2675
2676 bond_for_each_slave_rcu(bond, slave, iter) {
2677 slave->new_link = BOND_LINK_NOCHANGE;
2678 last_rx = slave_last_rx(bond, slave);
2679
2680 if (slave->link != BOND_LINK_UP) {
2681 if (bond_time_in_interval(bond, last_rx, 1)) {
2682 slave->new_link = BOND_LINK_UP;
2683 commit++;
2684 }
2685 continue;
2686 }
2687
2688 /* Give slaves 2*delta after being enslaved or made
2689 * active. This avoids bouncing, as the last receive
2690 * times need a full ARP monitor cycle to be updated.
2691 */
2692 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2693 continue;
2694
2695 /* Backup slave is down if:
2696 * - No current_arp_slave AND
2697 * - more than 3*delta since last receive AND
2698 * - the bond has an IP address
2699 *
2700 * Note: a non-null current_arp_slave indicates
2701 * the curr_active_slave went down and we are
2702 * searching for a new one; under this condition
2703 * we only take the curr_active_slave down - this
2704 * gives each slave a chance to tx/rx traffic
2705 * before being taken out
2706 */
2707 if (!bond_is_active_slave(slave) &&
2708 !rcu_access_pointer(bond->current_arp_slave) &&
2709 !bond_time_in_interval(bond, last_rx, 3)) {
2710 slave->new_link = BOND_LINK_DOWN;
2711 commit++;
2712 }
2713
2714 /* Active slave is down if:
2715 * - more than 2*delta since transmitting OR
2716 * - (more than 2*delta since receive AND
2717 * the bond has an IP address)
2718 */
2719 trans_start = dev_trans_start(slave->dev);
2720 if (bond_is_active_slave(slave) &&
2721 (!bond_time_in_interval(bond, trans_start, 2) ||
2722 !bond_time_in_interval(bond, last_rx, 2))) {
2723 slave->new_link = BOND_LINK_DOWN;
2724 commit++;
2725 }
2726 }
2727
2728 return commit;
2729 }
2730
2731 /* Called to commit link state changes noted by inspection step of
2732 * active-backup mode ARP monitor.
2733 *
2734 * Called with RTNL hold.
2735 */
2736 static void bond_ab_arp_commit(struct bonding *bond)
2737 {
2738 unsigned long trans_start;
2739 struct list_head *iter;
2740 struct slave *slave;
2741
2742 bond_for_each_slave(bond, slave, iter) {
2743 switch (slave->new_link) {
2744 case BOND_LINK_NOCHANGE:
2745 continue;
2746
2747 case BOND_LINK_UP:
2748 trans_start = dev_trans_start(slave->dev);
2749 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2750 (!rtnl_dereference(bond->curr_active_slave) &&
2751 bond_time_in_interval(bond, trans_start, 1))) {
2752 struct slave *current_arp_slave;
2753
2754 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2755 bond_set_slave_link_state(slave, BOND_LINK_UP,
2756 BOND_SLAVE_NOTIFY_NOW);
2757 if (current_arp_slave) {
2758 bond_set_slave_inactive_flags(
2759 current_arp_slave,
2760 BOND_SLAVE_NOTIFY_NOW);
2761 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2762 }
2763
2764 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2765 slave->dev->name);
2766
2767 if (!rtnl_dereference(bond->curr_active_slave) ||
2768 slave == rtnl_dereference(bond->primary_slave))
2769 goto do_failover;
2770
2771 }
2772
2773 continue;
2774
2775 case BOND_LINK_DOWN:
2776 if (slave->link_failure_count < UINT_MAX)
2777 slave->link_failure_count++;
2778
2779 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2780 BOND_SLAVE_NOTIFY_NOW);
2781 bond_set_slave_inactive_flags(slave,
2782 BOND_SLAVE_NOTIFY_NOW);
2783
2784 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2785 slave->dev->name);
2786
2787 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2788 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2789 goto do_failover;
2790 }
2791
2792 continue;
2793
2794 default:
2795 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2796 slave->new_link, slave->dev->name);
2797 continue;
2798 }
2799
2800 do_failover:
2801 block_netpoll_tx();
2802 bond_select_active_slave(bond);
2803 unblock_netpoll_tx();
2804 }
2805
2806 bond_set_carrier(bond);
2807 }
2808
2809 /* Send ARP probes for active-backup mode ARP monitor.
2810 *
2811 * Called with rcu_read_lock held.
2812 */
2813 static bool bond_ab_arp_probe(struct bonding *bond)
2814 {
2815 struct slave *slave, *before = NULL, *new_slave = NULL,
2816 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2817 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2818 struct list_head *iter;
2819 bool found = false;
2820 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2821
2822 if (curr_arp_slave && curr_active_slave)
2823 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2824 curr_arp_slave->dev->name,
2825 curr_active_slave->dev->name);
2826
2827 if (curr_active_slave) {
2828 bond_arp_send_all(bond, curr_active_slave);
2829 return should_notify_rtnl;
2830 }
2831
2832 /* if we don't have a curr_active_slave, search for the next available
2833 * backup slave from the current_arp_slave and make it the candidate
2834 * for becoming the curr_active_slave
2835 */
2836
2837 if (!curr_arp_slave) {
2838 curr_arp_slave = bond_first_slave_rcu(bond);
2839 if (!curr_arp_slave)
2840 return should_notify_rtnl;
2841 }
2842
2843 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2844
2845 bond_for_each_slave_rcu(bond, slave, iter) {
2846 if (!found && !before && bond_slave_is_up(slave))
2847 before = slave;
2848
2849 if (found && !new_slave && bond_slave_is_up(slave))
2850 new_slave = slave;
2851 /* if the link state is up at this point, we
2852 * mark it down - this can happen if we have
2853 * simultaneous link failures and
2854 * reselect_active_interface doesn't make this
2855 * one the current slave so it is still marked
2856 * up when it is actually down
2857 */
2858 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2859 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2860 BOND_SLAVE_NOTIFY_LATER);
2861 if (slave->link_failure_count < UINT_MAX)
2862 slave->link_failure_count++;
2863
2864 bond_set_slave_inactive_flags(slave,
2865 BOND_SLAVE_NOTIFY_LATER);
2866
2867 netdev_info(bond->dev, "backup interface %s is now down\n",
2868 slave->dev->name);
2869 }
2870 if (slave == curr_arp_slave)
2871 found = true;
2872 }
2873
2874 if (!new_slave && before)
2875 new_slave = before;
2876
2877 if (!new_slave)
2878 goto check_state;
2879
2880 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2881 BOND_SLAVE_NOTIFY_LATER);
2882 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2883 bond_arp_send_all(bond, new_slave);
2884 new_slave->last_link_up = jiffies;
2885 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2886
2887 check_state:
2888 bond_for_each_slave_rcu(bond, slave, iter) {
2889 if (slave->should_notify || slave->should_notify_link) {
2890 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2891 break;
2892 }
2893 }
2894 return should_notify_rtnl;
2895 }
2896
2897 static void bond_activebackup_arp_mon(struct work_struct *work)
2898 {
2899 struct bonding *bond = container_of(work, struct bonding,
2900 arp_work.work);
2901 bool should_notify_peers = false;
2902 bool should_notify_rtnl = false;
2903 int delta_in_ticks;
2904
2905 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2906
2907 if (!bond_has_slaves(bond))
2908 goto re_arm;
2909
2910 rcu_read_lock();
2911
2912 should_notify_peers = bond_should_notify_peers(bond);
2913
2914 if (bond_ab_arp_inspect(bond)) {
2915 rcu_read_unlock();
2916
2917 /* Race avoidance with bond_close flush of workqueue */
2918 if (!rtnl_trylock()) {
2919 delta_in_ticks = 1;
2920 should_notify_peers = false;
2921 goto re_arm;
2922 }
2923
2924 bond_ab_arp_commit(bond);
2925
2926 rtnl_unlock();
2927 rcu_read_lock();
2928 }
2929
2930 should_notify_rtnl = bond_ab_arp_probe(bond);
2931 rcu_read_unlock();
2932
2933 re_arm:
2934 if (bond->params.arp_interval)
2935 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2936
2937 if (should_notify_peers || should_notify_rtnl) {
2938 if (!rtnl_trylock())
2939 return;
2940
2941 if (should_notify_peers)
2942 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2943 bond->dev);
2944 if (should_notify_rtnl) {
2945 bond_slave_state_notify(bond);
2946 bond_slave_link_notify(bond);
2947 }
2948
2949 rtnl_unlock();
2950 }
2951 }
2952
2953 /*-------------------------- netdev event handling --------------------------*/
2954
2955 /* Change device name */
2956 static int bond_event_changename(struct bonding *bond)
2957 {
2958 bond_remove_proc_entry(bond);
2959 bond_create_proc_entry(bond);
2960
2961 bond_debug_reregister(bond);
2962
2963 return NOTIFY_DONE;
2964 }
2965
2966 static int bond_master_netdev_event(unsigned long event,
2967 struct net_device *bond_dev)
2968 {
2969 struct bonding *event_bond = netdev_priv(bond_dev);
2970
2971 switch (event) {
2972 case NETDEV_CHANGENAME:
2973 return bond_event_changename(event_bond);
2974 case NETDEV_UNREGISTER:
2975 bond_remove_proc_entry(event_bond);
2976 break;
2977 case NETDEV_REGISTER:
2978 bond_create_proc_entry(event_bond);
2979 break;
2980 case NETDEV_NOTIFY_PEERS:
2981 if (event_bond->send_peer_notif)
2982 event_bond->send_peer_notif--;
2983 break;
2984 default:
2985 break;
2986 }
2987
2988 return NOTIFY_DONE;
2989 }
2990
2991 static int bond_slave_netdev_event(unsigned long event,
2992 struct net_device *slave_dev)
2993 {
2994 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
2995 struct bonding *bond;
2996 struct net_device *bond_dev;
2997
2998 /* A netdev event can be generated while enslaving a device
2999 * before netdev_rx_handler_register is called in which case
3000 * slave will be NULL
3001 */
3002 if (!slave)
3003 return NOTIFY_DONE;
3004 bond_dev = slave->bond->dev;
3005 bond = slave->bond;
3006 primary = rtnl_dereference(bond->primary_slave);
3007
3008 switch (event) {
3009 case NETDEV_UNREGISTER:
3010 if (bond_dev->type != ARPHRD_ETHER)
3011 bond_release_and_destroy(bond_dev, slave_dev);
3012 else
3013 bond_release(bond_dev, slave_dev);
3014 break;
3015 case NETDEV_UP:
3016 case NETDEV_CHANGE:
3017 bond_update_speed_duplex(slave);
3018 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3019 bond_3ad_adapter_speed_duplex_changed(slave);
3020 /* Fallthrough */
3021 case NETDEV_DOWN:
3022 /* Refresh slave-array if applicable!
3023 * If the setup does not use miimon or arpmon (mode-specific!),
3024 * then these events will not cause the slave-array to be
3025 * refreshed. This will cause xmit to use a slave that is not
3026 * usable. Avoid such situation by refeshing the array at these
3027 * events. If these (miimon/arpmon) parameters are configured
3028 * then array gets refreshed twice and that should be fine!
3029 */
3030 if (bond_mode_uses_xmit_hash(bond))
3031 bond_update_slave_arr(bond, NULL);
3032 break;
3033 case NETDEV_CHANGEMTU:
3034 /* TODO: Should slaves be allowed to
3035 * independently alter their MTU? For
3036 * an active-backup bond, slaves need
3037 * not be the same type of device, so
3038 * MTUs may vary. For other modes,
3039 * slaves arguably should have the
3040 * same MTUs. To do this, we'd need to
3041 * take over the slave's change_mtu
3042 * function for the duration of their
3043 * servitude.
3044 */
3045 break;
3046 case NETDEV_CHANGENAME:
3047 /* we don't care if we don't have primary set */
3048 if (!bond_uses_primary(bond) ||
3049 !bond->params.primary[0])
3050 break;
3051
3052 if (slave == primary) {
3053 /* slave's name changed - he's no longer primary */
3054 RCU_INIT_POINTER(bond->primary_slave, NULL);
3055 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3056 /* we have a new primary slave */
3057 rcu_assign_pointer(bond->primary_slave, slave);
3058 } else { /* we didn't change primary - exit */
3059 break;
3060 }
3061
3062 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3063 primary ? slave_dev->name : "none");
3064
3065 block_netpoll_tx();
3066 bond_select_active_slave(bond);
3067 unblock_netpoll_tx();
3068 break;
3069 case NETDEV_FEAT_CHANGE:
3070 bond_compute_features(bond);
3071 break;
3072 case NETDEV_RESEND_IGMP:
3073 /* Propagate to master device */
3074 call_netdevice_notifiers(event, slave->bond->dev);
3075 break;
3076 default:
3077 break;
3078 }
3079
3080 return NOTIFY_DONE;
3081 }
3082
3083 /* bond_netdev_event: handle netdev notifier chain events.
3084 *
3085 * This function receives events for the netdev chain. The caller (an
3086 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3087 * locks for us to safely manipulate the slave devices (RTNL lock,
3088 * dev_probe_lock).
3089 */
3090 static int bond_netdev_event(struct notifier_block *this,
3091 unsigned long event, void *ptr)
3092 {
3093 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3094
3095 netdev_dbg(event_dev, "event: %lx\n", event);
3096
3097 if (!(event_dev->priv_flags & IFF_BONDING))
3098 return NOTIFY_DONE;
3099
3100 if (event_dev->flags & IFF_MASTER) {
3101 netdev_dbg(event_dev, "IFF_MASTER\n");
3102 return bond_master_netdev_event(event, event_dev);
3103 }
3104
3105 if (event_dev->flags & IFF_SLAVE) {
3106 netdev_dbg(event_dev, "IFF_SLAVE\n");
3107 return bond_slave_netdev_event(event, event_dev);
3108 }
3109
3110 return NOTIFY_DONE;
3111 }
3112
3113 static struct notifier_block bond_netdev_notifier = {
3114 .notifier_call = bond_netdev_event,
3115 };
3116
3117 /*---------------------------- Hashing Policies -----------------------------*/
3118
3119 /* L2 hash helper */
3120 static inline u32 bond_eth_hash(struct sk_buff *skb)
3121 {
3122 struct ethhdr *ep, hdr_tmp;
3123
3124 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3125 if (ep)
3126 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3127 return 0;
3128 }
3129
3130 /* Extract the appropriate headers based on bond's xmit policy */
3131 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3132 struct flow_keys *fk)
3133 {
3134 const struct ipv6hdr *iph6;
3135 const struct iphdr *iph;
3136 int noff, proto = -1;
3137
3138 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3139 return skb_flow_dissect_flow_keys(skb, fk, 0);
3140
3141 fk->ports.ports = 0;
3142 noff = skb_network_offset(skb);
3143 if (skb->protocol == htons(ETH_P_IP)) {
3144 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3145 return false;
3146 iph = ip_hdr(skb);
3147 iph_to_flow_copy_v4addrs(fk, iph);
3148 noff += iph->ihl << 2;
3149 if (!ip_is_fragment(iph))
3150 proto = iph->protocol;
3151 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3152 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3153 return false;
3154 iph6 = ipv6_hdr(skb);
3155 iph_to_flow_copy_v6addrs(fk, iph6);
3156 noff += sizeof(*iph6);
3157 proto = iph6->nexthdr;
3158 } else {
3159 return false;
3160 }
3161 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3162 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3163
3164 return true;
3165 }
3166
3167 /**
3168 * bond_xmit_hash - generate a hash value based on the xmit policy
3169 * @bond: bonding device
3170 * @skb: buffer to use for headers
3171 *
3172 * This function will extract the necessary headers from the skb buffer and use
3173 * them to generate a hash based on the xmit_policy set in the bonding device
3174 */
3175 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3176 {
3177 struct flow_keys flow;
3178 u32 hash;
3179
3180 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3181 skb->l4_hash)
3182 return skb->hash;
3183
3184 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3185 !bond_flow_dissect(bond, skb, &flow))
3186 return bond_eth_hash(skb);
3187
3188 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3189 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3190 hash = bond_eth_hash(skb);
3191 else
3192 hash = (__force u32)flow.ports.ports;
3193 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3194 (__force u32)flow_get_u32_src(&flow);
3195 hash ^= (hash >> 16);
3196 hash ^= (hash >> 8);
3197
3198 return hash;
3199 }
3200
3201 /*-------------------------- Device entry points ----------------------------*/
3202
3203 static void bond_work_init_all(struct bonding *bond)
3204 {
3205 INIT_DELAYED_WORK(&bond->mcast_work,
3206 bond_resend_igmp_join_requests_delayed);
3207 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3208 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3209 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3210 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3211 else
3212 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3213 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3214 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3215 }
3216
3217 static void bond_work_cancel_all(struct bonding *bond)
3218 {
3219 cancel_delayed_work_sync(&bond->mii_work);
3220 cancel_delayed_work_sync(&bond->arp_work);
3221 cancel_delayed_work_sync(&bond->alb_work);
3222 cancel_delayed_work_sync(&bond->ad_work);
3223 cancel_delayed_work_sync(&bond->mcast_work);
3224 cancel_delayed_work_sync(&bond->slave_arr_work);
3225 }
3226
3227 static int bond_open(struct net_device *bond_dev)
3228 {
3229 struct bonding *bond = netdev_priv(bond_dev);
3230 struct list_head *iter;
3231 struct slave *slave;
3232
3233 /* reset slave->backup and slave->inactive */
3234 if (bond_has_slaves(bond)) {
3235 bond_for_each_slave(bond, slave, iter) {
3236 if (bond_uses_primary(bond) &&
3237 slave != rcu_access_pointer(bond->curr_active_slave)) {
3238 bond_set_slave_inactive_flags(slave,
3239 BOND_SLAVE_NOTIFY_NOW);
3240 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3241 bond_set_slave_active_flags(slave,
3242 BOND_SLAVE_NOTIFY_NOW);
3243 }
3244 }
3245 }
3246
3247 bond_work_init_all(bond);
3248
3249 if (bond_is_lb(bond)) {
3250 /* bond_alb_initialize must be called before the timer
3251 * is started.
3252 */
3253 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3254 return -ENOMEM;
3255 if (bond->params.tlb_dynamic_lb)
3256 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3257 }
3258
3259 if (bond->params.miimon) /* link check interval, in milliseconds. */
3260 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3261
3262 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3263 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3264 bond->recv_probe = bond_arp_rcv;
3265 }
3266
3267 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3268 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3269 /* register to receive LACPDUs */
3270 bond->recv_probe = bond_3ad_lacpdu_recv;
3271 bond_3ad_initiate_agg_selection(bond, 1);
3272 }
3273
3274 if (bond_mode_uses_xmit_hash(bond))
3275 bond_update_slave_arr(bond, NULL);
3276
3277 return 0;
3278 }
3279
3280 static int bond_close(struct net_device *bond_dev)
3281 {
3282 struct bonding *bond = netdev_priv(bond_dev);
3283
3284 bond_work_cancel_all(bond);
3285 bond->send_peer_notif = 0;
3286 if (bond_is_lb(bond))
3287 bond_alb_deinitialize(bond);
3288 bond->recv_probe = NULL;
3289
3290 return 0;
3291 }
3292
3293 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3294 struct rtnl_link_stats64 *stats)
3295 {
3296 struct bonding *bond = netdev_priv(bond_dev);
3297 struct rtnl_link_stats64 temp;
3298 struct list_head *iter;
3299 struct slave *slave;
3300
3301 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3302
3303 bond_for_each_slave(bond, slave, iter) {
3304 const struct rtnl_link_stats64 *sstats =
3305 dev_get_stats(slave->dev, &temp);
3306 struct rtnl_link_stats64 *pstats = &slave->slave_stats;
3307
3308 stats->rx_packets += sstats->rx_packets - pstats->rx_packets;
3309 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
3310 stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
3311 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
3312
3313 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;;
3314 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
3315 stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
3316 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped;
3317
3318 stats->multicast += sstats->multicast - pstats->multicast;
3319 stats->collisions += sstats->collisions - pstats->collisions;
3320
3321 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
3322 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
3323 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
3324 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
3325 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
3326 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
3327
3328 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors;
3329 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
3330 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
3331 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
3332 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors;
3333
3334 /* save off the slave stats for the next run */
3335 memcpy(pstats, sstats, sizeof(*sstats));
3336 }
3337 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3338
3339 return stats;
3340 }
3341
3342 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3343 {
3344 struct bonding *bond = netdev_priv(bond_dev);
3345 struct net_device *slave_dev = NULL;
3346 struct ifbond k_binfo;
3347 struct ifbond __user *u_binfo = NULL;
3348 struct ifslave k_sinfo;
3349 struct ifslave __user *u_sinfo = NULL;
3350 struct mii_ioctl_data *mii = NULL;
3351 struct bond_opt_value newval;
3352 struct net *net;
3353 int res = 0;
3354
3355 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3356
3357 switch (cmd) {
3358 case SIOCGMIIPHY:
3359 mii = if_mii(ifr);
3360 if (!mii)
3361 return -EINVAL;
3362
3363 mii->phy_id = 0;
3364 /* Fall Through */
3365 case SIOCGMIIREG:
3366 /* We do this again just in case we were called by SIOCGMIIREG
3367 * instead of SIOCGMIIPHY.
3368 */
3369 mii = if_mii(ifr);
3370 if (!mii)
3371 return -EINVAL;
3372
3373 if (mii->reg_num == 1) {
3374 mii->val_out = 0;
3375 if (netif_carrier_ok(bond->dev))
3376 mii->val_out = BMSR_LSTATUS;
3377 }
3378
3379 return 0;
3380 case BOND_INFO_QUERY_OLD:
3381 case SIOCBONDINFOQUERY:
3382 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3383
3384 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3385 return -EFAULT;
3386
3387 res = bond_info_query(bond_dev, &k_binfo);
3388 if (res == 0 &&
3389 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3390 return -EFAULT;
3391
3392 return res;
3393 case BOND_SLAVE_INFO_QUERY_OLD:
3394 case SIOCBONDSLAVEINFOQUERY:
3395 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3396
3397 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3398 return -EFAULT;
3399
3400 res = bond_slave_info_query(bond_dev, &k_sinfo);
3401 if (res == 0 &&
3402 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3403 return -EFAULT;
3404
3405 return res;
3406 default:
3407 break;
3408 }
3409
3410 net = dev_net(bond_dev);
3411
3412 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3413 return -EPERM;
3414
3415 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3416
3417 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3418
3419 if (!slave_dev)
3420 return -ENODEV;
3421
3422 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3423 switch (cmd) {
3424 case BOND_ENSLAVE_OLD:
3425 case SIOCBONDENSLAVE:
3426 res = bond_enslave(bond_dev, slave_dev);
3427 break;
3428 case BOND_RELEASE_OLD:
3429 case SIOCBONDRELEASE:
3430 res = bond_release(bond_dev, slave_dev);
3431 break;
3432 case BOND_SETHWADDR_OLD:
3433 case SIOCBONDSETHWADDR:
3434 bond_set_dev_addr(bond_dev, slave_dev);
3435 res = 0;
3436 break;
3437 case BOND_CHANGE_ACTIVE_OLD:
3438 case SIOCBONDCHANGEACTIVE:
3439 bond_opt_initstr(&newval, slave_dev->name);
3440 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3441 break;
3442 default:
3443 res = -EOPNOTSUPP;
3444 }
3445
3446 return res;
3447 }
3448
3449 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3450 {
3451 struct bonding *bond = netdev_priv(bond_dev);
3452
3453 if (change & IFF_PROMISC)
3454 bond_set_promiscuity(bond,
3455 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3456
3457 if (change & IFF_ALLMULTI)
3458 bond_set_allmulti(bond,
3459 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3460 }
3461
3462 static void bond_set_rx_mode(struct net_device *bond_dev)
3463 {
3464 struct bonding *bond = netdev_priv(bond_dev);
3465 struct list_head *iter;
3466 struct slave *slave;
3467
3468 rcu_read_lock();
3469 if (bond_uses_primary(bond)) {
3470 slave = rcu_dereference(bond->curr_active_slave);
3471 if (slave) {
3472 dev_uc_sync(slave->dev, bond_dev);
3473 dev_mc_sync(slave->dev, bond_dev);
3474 }
3475 } else {
3476 bond_for_each_slave_rcu(bond, slave, iter) {
3477 dev_uc_sync_multiple(slave->dev, bond_dev);
3478 dev_mc_sync_multiple(slave->dev, bond_dev);
3479 }
3480 }
3481 rcu_read_unlock();
3482 }
3483
3484 static int bond_neigh_init(struct neighbour *n)
3485 {
3486 struct bonding *bond = netdev_priv(n->dev);
3487 const struct net_device_ops *slave_ops;
3488 struct neigh_parms parms;
3489 struct slave *slave;
3490 int ret;
3491
3492 slave = bond_first_slave(bond);
3493 if (!slave)
3494 return 0;
3495 slave_ops = slave->dev->netdev_ops;
3496 if (!slave_ops->ndo_neigh_setup)
3497 return 0;
3498
3499 parms.neigh_setup = NULL;
3500 parms.neigh_cleanup = NULL;
3501 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3502 if (ret)
3503 return ret;
3504
3505 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3506 * after the last slave has been detached. Assumes that all slaves
3507 * utilize the same neigh_cleanup (true at this writing as only user
3508 * is ipoib).
3509 */
3510 n->parms->neigh_cleanup = parms.neigh_cleanup;
3511
3512 if (!parms.neigh_setup)
3513 return 0;
3514
3515 return parms.neigh_setup(n);
3516 }
3517
3518 /* The bonding ndo_neigh_setup is called at init time beofre any
3519 * slave exists. So we must declare proxy setup function which will
3520 * be used at run time to resolve the actual slave neigh param setup.
3521 *
3522 * It's also called by master devices (such as vlans) to setup their
3523 * underlying devices. In that case - do nothing, we're already set up from
3524 * our init.
3525 */
3526 static int bond_neigh_setup(struct net_device *dev,
3527 struct neigh_parms *parms)
3528 {
3529 /* modify only our neigh_parms */
3530 if (parms->dev == dev)
3531 parms->neigh_setup = bond_neigh_init;
3532
3533 return 0;
3534 }
3535
3536 /* Change the MTU of all of a master's slaves to match the master */
3537 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3538 {
3539 struct bonding *bond = netdev_priv(bond_dev);
3540 struct slave *slave, *rollback_slave;
3541 struct list_head *iter;
3542 int res = 0;
3543
3544 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3545
3546 bond_for_each_slave(bond, slave, iter) {
3547 netdev_dbg(bond_dev, "s %p c_m %p\n",
3548 slave, slave->dev->netdev_ops->ndo_change_mtu);
3549
3550 res = dev_set_mtu(slave->dev, new_mtu);
3551
3552 if (res) {
3553 /* If we failed to set the slave's mtu to the new value
3554 * we must abort the operation even in ACTIVE_BACKUP
3555 * mode, because if we allow the backup slaves to have
3556 * different mtu values than the active slave we'll
3557 * need to change their mtu when doing a failover. That
3558 * means changing their mtu from timer context, which
3559 * is probably not a good idea.
3560 */
3561 netdev_dbg(bond_dev, "err %d %s\n", res,
3562 slave->dev->name);
3563 goto unwind;
3564 }
3565 }
3566
3567 bond_dev->mtu = new_mtu;
3568
3569 return 0;
3570
3571 unwind:
3572 /* unwind from head to the slave that failed */
3573 bond_for_each_slave(bond, rollback_slave, iter) {
3574 int tmp_res;
3575
3576 if (rollback_slave == slave)
3577 break;
3578
3579 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3580 if (tmp_res) {
3581 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3582 tmp_res, rollback_slave->dev->name);
3583 }
3584 }
3585
3586 return res;
3587 }
3588
3589 /* Change HW address
3590 *
3591 * Note that many devices must be down to change the HW address, and
3592 * downing the master releases all slaves. We can make bonds full of
3593 * bonding devices to test this, however.
3594 */
3595 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3596 {
3597 struct bonding *bond = netdev_priv(bond_dev);
3598 struct slave *slave, *rollback_slave;
3599 struct sockaddr *sa = addr, tmp_sa;
3600 struct list_head *iter;
3601 int res = 0;
3602
3603 if (BOND_MODE(bond) == BOND_MODE_ALB)
3604 return bond_alb_set_mac_address(bond_dev, addr);
3605
3606
3607 netdev_dbg(bond_dev, "bond=%p\n", bond);
3608
3609 /* If fail_over_mac is enabled, do nothing and return success.
3610 * Returning an error causes ifenslave to fail.
3611 */
3612 if (bond->params.fail_over_mac &&
3613 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3614 return 0;
3615
3616 if (!is_valid_ether_addr(sa->sa_data))
3617 return -EADDRNOTAVAIL;
3618
3619 bond_for_each_slave(bond, slave, iter) {
3620 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3621 res = dev_set_mac_address(slave->dev, addr);
3622 if (res) {
3623 /* TODO: consider downing the slave
3624 * and retry ?
3625 * User should expect communications
3626 * breakage anyway until ARP finish
3627 * updating, so...
3628 */
3629 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3630 goto unwind;
3631 }
3632 }
3633
3634 /* success */
3635 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3636 return 0;
3637
3638 unwind:
3639 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3640 tmp_sa.sa_family = bond_dev->type;
3641
3642 /* unwind from head to the slave that failed */
3643 bond_for_each_slave(bond, rollback_slave, iter) {
3644 int tmp_res;
3645
3646 if (rollback_slave == slave)
3647 break;
3648
3649 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3650 if (tmp_res) {
3651 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3652 tmp_res, rollback_slave->dev->name);
3653 }
3654 }
3655
3656 return res;
3657 }
3658
3659 /**
3660 * bond_xmit_slave_id - transmit skb through slave with slave_id
3661 * @bond: bonding device that is transmitting
3662 * @skb: buffer to transmit
3663 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3664 *
3665 * This function tries to transmit through slave with slave_id but in case
3666 * it fails, it tries to find the first available slave for transmission.
3667 * The skb is consumed in all cases, thus the function is void.
3668 */
3669 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3670 {
3671 struct list_head *iter;
3672 struct slave *slave;
3673 int i = slave_id;
3674
3675 /* Here we start from the slave with slave_id */
3676 bond_for_each_slave_rcu(bond, slave, iter) {
3677 if (--i < 0) {
3678 if (bond_slave_can_tx(slave)) {
3679 bond_dev_queue_xmit(bond, skb, slave->dev);
3680 return;
3681 }
3682 }
3683 }
3684
3685 /* Here we start from the first slave up to slave_id */
3686 i = slave_id;
3687 bond_for_each_slave_rcu(bond, slave, iter) {
3688 if (--i < 0)
3689 break;
3690 if (bond_slave_can_tx(slave)) {
3691 bond_dev_queue_xmit(bond, skb, slave->dev);
3692 return;
3693 }
3694 }
3695 /* no slave that can tx has been found */
3696 bond_tx_drop(bond->dev, skb);
3697 }
3698
3699 /**
3700 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3701 * @bond: bonding device to use
3702 *
3703 * Based on the value of the bonding device's packets_per_slave parameter
3704 * this function generates a slave id, which is usually used as the next
3705 * slave to transmit through.
3706 */
3707 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3708 {
3709 u32 slave_id;
3710 struct reciprocal_value reciprocal_packets_per_slave;
3711 int packets_per_slave = bond->params.packets_per_slave;
3712
3713 switch (packets_per_slave) {
3714 case 0:
3715 slave_id = prandom_u32();
3716 break;
3717 case 1:
3718 slave_id = bond->rr_tx_counter;
3719 break;
3720 default:
3721 reciprocal_packets_per_slave =
3722 bond->params.reciprocal_packets_per_slave;
3723 slave_id = reciprocal_divide(bond->rr_tx_counter,
3724 reciprocal_packets_per_slave);
3725 break;
3726 }
3727 bond->rr_tx_counter++;
3728
3729 return slave_id;
3730 }
3731
3732 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3733 {
3734 struct bonding *bond = netdev_priv(bond_dev);
3735 struct iphdr *iph = ip_hdr(skb);
3736 struct slave *slave;
3737 u32 slave_id;
3738
3739 /* Start with the curr_active_slave that joined the bond as the
3740 * default for sending IGMP traffic. For failover purposes one
3741 * needs to maintain some consistency for the interface that will
3742 * send the join/membership reports. The curr_active_slave found
3743 * will send all of this type of traffic.
3744 */
3745 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3746 slave = rcu_dereference(bond->curr_active_slave);
3747 if (slave)
3748 bond_dev_queue_xmit(bond, skb, slave->dev);
3749 else
3750 bond_xmit_slave_id(bond, skb, 0);
3751 } else {
3752 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3753
3754 if (likely(slave_cnt)) {
3755 slave_id = bond_rr_gen_slave_id(bond);
3756 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3757 } else {
3758 bond_tx_drop(bond_dev, skb);
3759 }
3760 }
3761
3762 return NETDEV_TX_OK;
3763 }
3764
3765 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3766 * the bond has a usable interface.
3767 */
3768 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3769 {
3770 struct bonding *bond = netdev_priv(bond_dev);
3771 struct slave *slave;
3772
3773 slave = rcu_dereference(bond->curr_active_slave);
3774 if (slave)
3775 bond_dev_queue_xmit(bond, skb, slave->dev);
3776 else
3777 bond_tx_drop(bond_dev, skb);
3778
3779 return NETDEV_TX_OK;
3780 }
3781
3782 /* Use this to update slave_array when (a) it's not appropriate to update
3783 * slave_array right away (note that update_slave_array() may sleep)
3784 * and / or (b) RTNL is not held.
3785 */
3786 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3787 {
3788 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3789 }
3790
3791 /* Slave array work handler. Holds only RTNL */
3792 static void bond_slave_arr_handler(struct work_struct *work)
3793 {
3794 struct bonding *bond = container_of(work, struct bonding,
3795 slave_arr_work.work);
3796 int ret;
3797
3798 if (!rtnl_trylock())
3799 goto err;
3800
3801 ret = bond_update_slave_arr(bond, NULL);
3802 rtnl_unlock();
3803 if (ret) {
3804 pr_warn_ratelimited("Failed to update slave array from WT\n");
3805 goto err;
3806 }
3807 return;
3808
3809 err:
3810 bond_slave_arr_work_rearm(bond, 1);
3811 }
3812
3813 /* Build the usable slaves array in control path for modes that use xmit-hash
3814 * to determine the slave interface -
3815 * (a) BOND_MODE_8023AD
3816 * (b) BOND_MODE_XOR
3817 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3818 *
3819 * The caller is expected to hold RTNL only and NO other lock!
3820 */
3821 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3822 {
3823 struct slave *slave;
3824 struct list_head *iter;
3825 struct bond_up_slave *new_arr, *old_arr;
3826 int agg_id = 0;
3827 int ret = 0;
3828
3829 #ifdef CONFIG_LOCKDEP
3830 WARN_ON(lockdep_is_held(&bond->mode_lock));
3831 #endif
3832
3833 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3834 GFP_KERNEL);
3835 if (!new_arr) {
3836 ret = -ENOMEM;
3837 pr_err("Failed to build slave-array.\n");
3838 goto out;
3839 }
3840 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3841 struct ad_info ad_info;
3842
3843 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3844 pr_debug("bond_3ad_get_active_agg_info failed\n");
3845 kfree_rcu(new_arr, rcu);
3846 /* No active aggragator means it's not safe to use
3847 * the previous array.
3848 */
3849 old_arr = rtnl_dereference(bond->slave_arr);
3850 if (old_arr) {
3851 RCU_INIT_POINTER(bond->slave_arr, NULL);
3852 kfree_rcu(old_arr, rcu);
3853 }
3854 goto out;
3855 }
3856 agg_id = ad_info.aggregator_id;
3857 }
3858 bond_for_each_slave(bond, slave, iter) {
3859 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3860 struct aggregator *agg;
3861
3862 agg = SLAVE_AD_INFO(slave)->port.aggregator;
3863 if (!agg || agg->aggregator_identifier != agg_id)
3864 continue;
3865 }
3866 if (!bond_slave_can_tx(slave))
3867 continue;
3868 if (skipslave == slave)
3869 continue;
3870 new_arr->arr[new_arr->count++] = slave;
3871 }
3872
3873 old_arr = rtnl_dereference(bond->slave_arr);
3874 rcu_assign_pointer(bond->slave_arr, new_arr);
3875 if (old_arr)
3876 kfree_rcu(old_arr, rcu);
3877 out:
3878 if (ret != 0 && skipslave) {
3879 int idx;
3880
3881 /* Rare situation where caller has asked to skip a specific
3882 * slave but allocation failed (most likely!). BTW this is
3883 * only possible when the call is initiated from
3884 * __bond_release_one(). In this situation; overwrite the
3885 * skipslave entry in the array with the last entry from the
3886 * array to avoid a situation where the xmit path may choose
3887 * this to-be-skipped slave to send a packet out.
3888 */
3889 old_arr = rtnl_dereference(bond->slave_arr);
3890 for (idx = 0; idx < old_arr->count; idx++) {
3891 if (skipslave == old_arr->arr[idx]) {
3892 old_arr->arr[idx] =
3893 old_arr->arr[old_arr->count-1];
3894 old_arr->count--;
3895 break;
3896 }
3897 }
3898 }
3899 return ret;
3900 }
3901
3902 /* Use this Xmit function for 3AD as well as XOR modes. The current
3903 * usable slave array is formed in the control path. The xmit function
3904 * just calculates hash and sends the packet out.
3905 */
3906 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3907 {
3908 struct bonding *bond = netdev_priv(dev);
3909 struct slave *slave;
3910 struct bond_up_slave *slaves;
3911 unsigned int count;
3912
3913 slaves = rcu_dereference(bond->slave_arr);
3914 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3915 if (likely(count)) {
3916 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3917 bond_dev_queue_xmit(bond, skb, slave->dev);
3918 } else {
3919 bond_tx_drop(dev, skb);
3920 }
3921
3922 return NETDEV_TX_OK;
3923 }
3924
3925 /* in broadcast mode, we send everything to all usable interfaces. */
3926 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3927 {
3928 struct bonding *bond = netdev_priv(bond_dev);
3929 struct slave *slave = NULL;
3930 struct list_head *iter;
3931
3932 bond_for_each_slave_rcu(bond, slave, iter) {
3933 if (bond_is_last_slave(bond, slave))
3934 break;
3935 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3936 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3937
3938 if (!skb2) {
3939 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3940 bond_dev->name, __func__);
3941 continue;
3942 }
3943 bond_dev_queue_xmit(bond, skb2, slave->dev);
3944 }
3945 }
3946 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3947 bond_dev_queue_xmit(bond, skb, slave->dev);
3948 else
3949 bond_tx_drop(bond_dev, skb);
3950
3951 return NETDEV_TX_OK;
3952 }
3953
3954 /*------------------------- Device initialization ---------------------------*/
3955
3956 /* Lookup the slave that corresponds to a qid */
3957 static inline int bond_slave_override(struct bonding *bond,
3958 struct sk_buff *skb)
3959 {
3960 struct slave *slave = NULL;
3961 struct list_head *iter;
3962
3963 if (!skb->queue_mapping)
3964 return 1;
3965
3966 /* Find out if any slaves have the same mapping as this skb. */
3967 bond_for_each_slave_rcu(bond, slave, iter) {
3968 if (slave->queue_id == skb->queue_mapping) {
3969 if (bond_slave_is_up(slave) &&
3970 slave->link == BOND_LINK_UP) {
3971 bond_dev_queue_xmit(bond, skb, slave->dev);
3972 return 0;
3973 }
3974 /* If the slave isn't UP, use default transmit policy. */
3975 break;
3976 }
3977 }
3978
3979 return 1;
3980 }
3981
3982
3983 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3984 void *accel_priv, select_queue_fallback_t fallback)
3985 {
3986 /* This helper function exists to help dev_pick_tx get the correct
3987 * destination queue. Using a helper function skips a call to
3988 * skb_tx_hash and will put the skbs in the queue we expect on their
3989 * way down to the bonding driver.
3990 */
3991 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3992
3993 /* Save the original txq to restore before passing to the driver */
3994 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3995
3996 if (unlikely(txq >= dev->real_num_tx_queues)) {
3997 do {
3998 txq -= dev->real_num_tx_queues;
3999 } while (txq >= dev->real_num_tx_queues);
4000 }
4001 return txq;
4002 }
4003
4004 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4005 {
4006 struct bonding *bond = netdev_priv(dev);
4007
4008 if (bond_should_override_tx_queue(bond) &&
4009 !bond_slave_override(bond, skb))
4010 return NETDEV_TX_OK;
4011
4012 switch (BOND_MODE(bond)) {
4013 case BOND_MODE_ROUNDROBIN:
4014 return bond_xmit_roundrobin(skb, dev);
4015 case BOND_MODE_ACTIVEBACKUP:
4016 return bond_xmit_activebackup(skb, dev);
4017 case BOND_MODE_8023AD:
4018 case BOND_MODE_XOR:
4019 return bond_3ad_xor_xmit(skb, dev);
4020 case BOND_MODE_BROADCAST:
4021 return bond_xmit_broadcast(skb, dev);
4022 case BOND_MODE_ALB:
4023 return bond_alb_xmit(skb, dev);
4024 case BOND_MODE_TLB:
4025 return bond_tlb_xmit(skb, dev);
4026 default:
4027 /* Should never happen, mode already checked */
4028 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4029 WARN_ON_ONCE(1);
4030 bond_tx_drop(dev, skb);
4031 return NETDEV_TX_OK;
4032 }
4033 }
4034
4035 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4036 {
4037 struct bonding *bond = netdev_priv(dev);
4038 netdev_tx_t ret = NETDEV_TX_OK;
4039
4040 /* If we risk deadlock from transmitting this in the
4041 * netpoll path, tell netpoll to queue the frame for later tx
4042 */
4043 if (unlikely(is_netpoll_tx_blocked(dev)))
4044 return NETDEV_TX_BUSY;
4045
4046 rcu_read_lock();
4047 if (bond_has_slaves(bond))
4048 ret = __bond_start_xmit(skb, dev);
4049 else
4050 bond_tx_drop(dev, skb);
4051 rcu_read_unlock();
4052
4053 return ret;
4054 }
4055
4056 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4057 struct ethtool_cmd *ecmd)
4058 {
4059 struct bonding *bond = netdev_priv(bond_dev);
4060 unsigned long speed = 0;
4061 struct list_head *iter;
4062 struct slave *slave;
4063
4064 ecmd->duplex = DUPLEX_UNKNOWN;
4065 ecmd->port = PORT_OTHER;
4066
4067 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4068 * do not need to check mode. Though link speed might not represent
4069 * the true receive or transmit bandwidth (not all modes are symmetric)
4070 * this is an accurate maximum.
4071 */
4072 bond_for_each_slave(bond, slave, iter) {
4073 if (bond_slave_can_tx(slave)) {
4074 if (slave->speed != SPEED_UNKNOWN)
4075 speed += slave->speed;
4076 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4077 slave->duplex != DUPLEX_UNKNOWN)
4078 ecmd->duplex = slave->duplex;
4079 }
4080 }
4081 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4082
4083 return 0;
4084 }
4085
4086 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4087 struct ethtool_drvinfo *drvinfo)
4088 {
4089 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4090 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4091 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4092 BOND_ABI_VERSION);
4093 }
4094
4095 static const struct ethtool_ops bond_ethtool_ops = {
4096 .get_drvinfo = bond_ethtool_get_drvinfo,
4097 .get_settings = bond_ethtool_get_settings,
4098 .get_link = ethtool_op_get_link,
4099 };
4100
4101 static const struct net_device_ops bond_netdev_ops = {
4102 .ndo_init = bond_init,
4103 .ndo_uninit = bond_uninit,
4104 .ndo_open = bond_open,
4105 .ndo_stop = bond_close,
4106 .ndo_start_xmit = bond_start_xmit,
4107 .ndo_select_queue = bond_select_queue,
4108 .ndo_get_stats64 = bond_get_stats,
4109 .ndo_do_ioctl = bond_do_ioctl,
4110 .ndo_change_rx_flags = bond_change_rx_flags,
4111 .ndo_set_rx_mode = bond_set_rx_mode,
4112 .ndo_change_mtu = bond_change_mtu,
4113 .ndo_set_mac_address = bond_set_mac_address,
4114 .ndo_neigh_setup = bond_neigh_setup,
4115 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4116 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4117 #ifdef CONFIG_NET_POLL_CONTROLLER
4118 .ndo_netpoll_setup = bond_netpoll_setup,
4119 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4120 .ndo_poll_controller = bond_poll_controller,
4121 #endif
4122 .ndo_add_slave = bond_enslave,
4123 .ndo_del_slave = bond_release,
4124 .ndo_fix_features = bond_fix_features,
4125 .ndo_bridge_setlink = switchdev_port_bridge_setlink,
4126 .ndo_bridge_getlink = switchdev_port_bridge_getlink,
4127 .ndo_bridge_dellink = switchdev_port_bridge_dellink,
4128 .ndo_fdb_add = switchdev_port_fdb_add,
4129 .ndo_fdb_del = switchdev_port_fdb_del,
4130 .ndo_fdb_dump = switchdev_port_fdb_dump,
4131 .ndo_features_check = passthru_features_check,
4132 };
4133
4134 static const struct device_type bond_type = {
4135 .name = "bond",
4136 };
4137
4138 static void bond_destructor(struct net_device *bond_dev)
4139 {
4140 struct bonding *bond = netdev_priv(bond_dev);
4141 if (bond->wq)
4142 destroy_workqueue(bond->wq);
4143 free_netdev(bond_dev);
4144 }
4145
4146 void bond_setup(struct net_device *bond_dev)
4147 {
4148 struct bonding *bond = netdev_priv(bond_dev);
4149
4150 spin_lock_init(&bond->mode_lock);
4151 bond->params = bonding_defaults;
4152
4153 /* Initialize pointers */
4154 bond->dev = bond_dev;
4155
4156 /* Initialize the device entry points */
4157 ether_setup(bond_dev);
4158 bond_dev->netdev_ops = &bond_netdev_ops;
4159 bond_dev->ethtool_ops = &bond_ethtool_ops;
4160
4161 bond_dev->destructor = bond_destructor;
4162
4163 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4164
4165 /* Initialize the device options */
4166 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4167 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4168 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4169
4170 /* don't acquire bond device's netif_tx_lock when transmitting */
4171 bond_dev->features |= NETIF_F_LLTX;
4172
4173 /* By default, we declare the bond to be fully
4174 * VLAN hardware accelerated capable. Special
4175 * care is taken in the various xmit functions
4176 * when there are slaves that are not hw accel
4177 * capable
4178 */
4179
4180 /* Don't allow bond devices to change network namespaces. */
4181 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4182
4183 bond_dev->hw_features = BOND_VLAN_FEATURES |
4184 NETIF_F_HW_VLAN_CTAG_TX |
4185 NETIF_F_HW_VLAN_CTAG_RX |
4186 NETIF_F_HW_VLAN_CTAG_FILTER;
4187
4188 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4189 bond_dev->features |= bond_dev->hw_features;
4190 }
4191
4192 /* Destroy a bonding device.
4193 * Must be under rtnl_lock when this function is called.
4194 */
4195 static void bond_uninit(struct net_device *bond_dev)
4196 {
4197 struct bonding *bond = netdev_priv(bond_dev);
4198 struct list_head *iter;
4199 struct slave *slave;
4200 struct bond_up_slave *arr;
4201
4202 bond_netpoll_cleanup(bond_dev);
4203
4204 /* Release the bonded slaves */
4205 bond_for_each_slave(bond, slave, iter)
4206 __bond_release_one(bond_dev, slave->dev, true);
4207 netdev_info(bond_dev, "Released all slaves\n");
4208
4209 arr = rtnl_dereference(bond->slave_arr);
4210 if (arr) {
4211 RCU_INIT_POINTER(bond->slave_arr, NULL);
4212 kfree_rcu(arr, rcu);
4213 }
4214
4215 list_del(&bond->bond_list);
4216
4217 bond_debug_unregister(bond);
4218 }
4219
4220 /*------------------------- Module initialization ---------------------------*/
4221
4222 static int bond_check_params(struct bond_params *params)
4223 {
4224 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4225 struct bond_opt_value newval;
4226 const struct bond_opt_value *valptr;
4227 int arp_all_targets_value;
4228 u16 ad_actor_sys_prio = 0;
4229 u16 ad_user_port_key = 0;
4230
4231 /* Convert string parameters. */
4232 if (mode) {
4233 bond_opt_initstr(&newval, mode);
4234 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4235 if (!valptr) {
4236 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4237 return -EINVAL;
4238 }
4239 bond_mode = valptr->value;
4240 }
4241
4242 if (xmit_hash_policy) {
4243 if ((bond_mode != BOND_MODE_XOR) &&
4244 (bond_mode != BOND_MODE_8023AD) &&
4245 (bond_mode != BOND_MODE_TLB)) {
4246 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4247 bond_mode_name(bond_mode));
4248 } else {
4249 bond_opt_initstr(&newval, xmit_hash_policy);
4250 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4251 &newval);
4252 if (!valptr) {
4253 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4254 xmit_hash_policy);
4255 return -EINVAL;
4256 }
4257 xmit_hashtype = valptr->value;
4258 }
4259 }
4260
4261 if (lacp_rate) {
4262 if (bond_mode != BOND_MODE_8023AD) {
4263 pr_info("lacp_rate param is irrelevant in mode %s\n",
4264 bond_mode_name(bond_mode));
4265 } else {
4266 bond_opt_initstr(&newval, lacp_rate);
4267 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4268 &newval);
4269 if (!valptr) {
4270 pr_err("Error: Invalid lacp rate \"%s\"\n",
4271 lacp_rate);
4272 return -EINVAL;
4273 }
4274 lacp_fast = valptr->value;
4275 }
4276 }
4277
4278 if (ad_select) {
4279 bond_opt_initstr(&newval, ad_select);
4280 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4281 &newval);
4282 if (!valptr) {
4283 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4284 return -EINVAL;
4285 }
4286 params->ad_select = valptr->value;
4287 if (bond_mode != BOND_MODE_8023AD)
4288 pr_warn("ad_select param only affects 802.3ad mode\n");
4289 } else {
4290 params->ad_select = BOND_AD_STABLE;
4291 }
4292
4293 if (max_bonds < 0) {
4294 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4295 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4296 max_bonds = BOND_DEFAULT_MAX_BONDS;
4297 }
4298
4299 if (miimon < 0) {
4300 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4301 miimon, INT_MAX);
4302 miimon = 0;
4303 }
4304
4305 if (updelay < 0) {
4306 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4307 updelay, INT_MAX);
4308 updelay = 0;
4309 }
4310
4311 if (downdelay < 0) {
4312 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4313 downdelay, INT_MAX);
4314 downdelay = 0;
4315 }
4316
4317 if ((use_carrier != 0) && (use_carrier != 1)) {
4318 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4319 use_carrier);
4320 use_carrier = 1;
4321 }
4322
4323 if (num_peer_notif < 0 || num_peer_notif > 255) {
4324 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4325 num_peer_notif);
4326 num_peer_notif = 1;
4327 }
4328
4329 /* reset values for 802.3ad/TLB/ALB */
4330 if (!bond_mode_uses_arp(bond_mode)) {
4331 if (!miimon) {
4332 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");
4333 pr_warn("Forcing miimon to 100msec\n");
4334 miimon = BOND_DEFAULT_MIIMON;
4335 }
4336 }
4337
4338 if (tx_queues < 1 || tx_queues > 255) {
4339 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4340 tx_queues, BOND_DEFAULT_TX_QUEUES);
4341 tx_queues = BOND_DEFAULT_TX_QUEUES;
4342 }
4343
4344 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4345 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4346 all_slaves_active);
4347 all_slaves_active = 0;
4348 }
4349
4350 if (resend_igmp < 0 || resend_igmp > 255) {
4351 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4352 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4353 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4354 }
4355
4356 bond_opt_initval(&newval, packets_per_slave);
4357 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4358 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4359 packets_per_slave, USHRT_MAX);
4360 packets_per_slave = 1;
4361 }
4362
4363 if (bond_mode == BOND_MODE_ALB) {
4364 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",
4365 updelay);
4366 }
4367
4368 if (!miimon) {
4369 if (updelay || downdelay) {
4370 /* just warn the user the up/down delay will have
4371 * no effect since miimon is zero...
4372 */
4373 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",
4374 updelay, downdelay);
4375 }
4376 } else {
4377 /* don't allow arp monitoring */
4378 if (arp_interval) {
4379 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4380 miimon, arp_interval);
4381 arp_interval = 0;
4382 }
4383
4384 if ((updelay % miimon) != 0) {
4385 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4386 updelay, miimon, (updelay / miimon) * miimon);
4387 }
4388
4389 updelay /= miimon;
4390
4391 if ((downdelay % miimon) != 0) {
4392 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4393 downdelay, miimon,
4394 (downdelay / miimon) * miimon);
4395 }
4396
4397 downdelay /= miimon;
4398 }
4399
4400 if (arp_interval < 0) {
4401 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4402 arp_interval, INT_MAX);
4403 arp_interval = 0;
4404 }
4405
4406 for (arp_ip_count = 0, i = 0;
4407 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4408 __be32 ip;
4409
4410 /* not a complete check, but good enough to catch mistakes */
4411 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4412 !bond_is_ip_target_ok(ip)) {
4413 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4414 arp_ip_target[i]);
4415 arp_interval = 0;
4416 } else {
4417 if (bond_get_targets_ip(arp_target, ip) == -1)
4418 arp_target[arp_ip_count++] = ip;
4419 else
4420 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4421 &ip);
4422 }
4423 }
4424
4425 if (arp_interval && !arp_ip_count) {
4426 /* don't allow arping if no arp_ip_target given... */
4427 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4428 arp_interval);
4429 arp_interval = 0;
4430 }
4431
4432 if (arp_validate) {
4433 if (!arp_interval) {
4434 pr_err("arp_validate requires arp_interval\n");
4435 return -EINVAL;
4436 }
4437
4438 bond_opt_initstr(&newval, arp_validate);
4439 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4440 &newval);
4441 if (!valptr) {
4442 pr_err("Error: invalid arp_validate \"%s\"\n",
4443 arp_validate);
4444 return -EINVAL;
4445 }
4446 arp_validate_value = valptr->value;
4447 } else {
4448 arp_validate_value = 0;
4449 }
4450
4451 arp_all_targets_value = 0;
4452 if (arp_all_targets) {
4453 bond_opt_initstr(&newval, arp_all_targets);
4454 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4455 &newval);
4456 if (!valptr) {
4457 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4458 arp_all_targets);
4459 arp_all_targets_value = 0;
4460 } else {
4461 arp_all_targets_value = valptr->value;
4462 }
4463 }
4464
4465 if (miimon) {
4466 pr_info("MII link monitoring set to %d ms\n", miimon);
4467 } else if (arp_interval) {
4468 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4469 arp_validate_value);
4470 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4471 arp_interval, valptr->string, arp_ip_count);
4472
4473 for (i = 0; i < arp_ip_count; i++)
4474 pr_cont(" %s", arp_ip_target[i]);
4475
4476 pr_cont("\n");
4477
4478 } else if (max_bonds) {
4479 /* miimon and arp_interval not set, we need one so things
4480 * work as expected, see bonding.txt for details
4481 */
4482 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");
4483 }
4484
4485 if (primary && !bond_mode_uses_primary(bond_mode)) {
4486 /* currently, using a primary only makes sense
4487 * in active backup, TLB or ALB modes
4488 */
4489 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4490 primary, bond_mode_name(bond_mode));
4491 primary = NULL;
4492 }
4493
4494 if (primary && primary_reselect) {
4495 bond_opt_initstr(&newval, primary_reselect);
4496 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4497 &newval);
4498 if (!valptr) {
4499 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4500 primary_reselect);
4501 return -EINVAL;
4502 }
4503 primary_reselect_value = valptr->value;
4504 } else {
4505 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4506 }
4507
4508 if (fail_over_mac) {
4509 bond_opt_initstr(&newval, fail_over_mac);
4510 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4511 &newval);
4512 if (!valptr) {
4513 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4514 fail_over_mac);
4515 return -EINVAL;
4516 }
4517 fail_over_mac_value = valptr->value;
4518 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4519 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4520 } else {
4521 fail_over_mac_value = BOND_FOM_NONE;
4522 }
4523
4524 bond_opt_initstr(&newval, "default");
4525 valptr = bond_opt_parse(
4526 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4527 &newval);
4528 if (!valptr) {
4529 pr_err("Error: No ad_actor_sys_prio default value");
4530 return -EINVAL;
4531 }
4532 ad_actor_sys_prio = valptr->value;
4533
4534 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4535 &newval);
4536 if (!valptr) {
4537 pr_err("Error: No ad_user_port_key default value");
4538 return -EINVAL;
4539 }
4540 ad_user_port_key = valptr->value;
4541
4542 if (lp_interval == 0) {
4543 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4544 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4545 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4546 }
4547
4548 /* fill params struct with the proper values */
4549 params->mode = bond_mode;
4550 params->xmit_policy = xmit_hashtype;
4551 params->miimon = miimon;
4552 params->num_peer_notif = num_peer_notif;
4553 params->arp_interval = arp_interval;
4554 params->arp_validate = arp_validate_value;
4555 params->arp_all_targets = arp_all_targets_value;
4556 params->updelay = updelay;
4557 params->downdelay = downdelay;
4558 params->use_carrier = use_carrier;
4559 params->lacp_fast = lacp_fast;
4560 params->primary[0] = 0;
4561 params->primary_reselect = primary_reselect_value;
4562 params->fail_over_mac = fail_over_mac_value;
4563 params->tx_queues = tx_queues;
4564 params->all_slaves_active = all_slaves_active;
4565 params->resend_igmp = resend_igmp;
4566 params->min_links = min_links;
4567 params->lp_interval = lp_interval;
4568 params->packets_per_slave = packets_per_slave;
4569 params->tlb_dynamic_lb = 1; /* Default value */
4570 params->ad_actor_sys_prio = ad_actor_sys_prio;
4571 eth_zero_addr(params->ad_actor_system);
4572 params->ad_user_port_key = ad_user_port_key;
4573 if (packets_per_slave > 0) {
4574 params->reciprocal_packets_per_slave =
4575 reciprocal_value(packets_per_slave);
4576 } else {
4577 /* reciprocal_packets_per_slave is unused if
4578 * packets_per_slave is 0 or 1, just initialize it
4579 */
4580 params->reciprocal_packets_per_slave =
4581 (struct reciprocal_value) { 0 };
4582 }
4583
4584 if (primary) {
4585 strncpy(params->primary, primary, IFNAMSIZ);
4586 params->primary[IFNAMSIZ - 1] = 0;
4587 }
4588
4589 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4590
4591 return 0;
4592 }
4593
4594 static struct lock_class_key bonding_netdev_xmit_lock_key;
4595 static struct lock_class_key bonding_netdev_addr_lock_key;
4596 static struct lock_class_key bonding_tx_busylock_key;
4597
4598 static void bond_set_lockdep_class_one(struct net_device *dev,
4599 struct netdev_queue *txq,
4600 void *_unused)
4601 {
4602 lockdep_set_class(&txq->_xmit_lock,
4603 &bonding_netdev_xmit_lock_key);
4604 }
4605
4606 static void bond_set_lockdep_class(struct net_device *dev)
4607 {
4608 lockdep_set_class(&dev->addr_list_lock,
4609 &bonding_netdev_addr_lock_key);
4610 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4611 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4612 }
4613
4614 /* Called from registration process */
4615 static int bond_init(struct net_device *bond_dev)
4616 {
4617 struct bonding *bond = netdev_priv(bond_dev);
4618 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4619
4620 netdev_dbg(bond_dev, "Begin bond_init\n");
4621
4622 bond->wq = create_singlethread_workqueue(bond_dev->name);
4623 if (!bond->wq)
4624 return -ENOMEM;
4625
4626 bond_set_lockdep_class(bond_dev);
4627
4628 list_add_tail(&bond->bond_list, &bn->dev_list);
4629
4630 bond_prepare_sysfs_group(bond);
4631
4632 bond_debug_register(bond);
4633
4634 /* Ensure valid dev_addr */
4635 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4636 bond_dev->addr_assign_type == NET_ADDR_PERM)
4637 eth_hw_addr_random(bond_dev);
4638
4639 return 0;
4640 }
4641
4642 unsigned int bond_get_num_tx_queues(void)
4643 {
4644 return tx_queues;
4645 }
4646
4647 /* Create a new bond based on the specified name and bonding parameters.
4648 * If name is NULL, obtain a suitable "bond%d" name for us.
4649 * Caller must NOT hold rtnl_lock; we need to release it here before we
4650 * set up our sysfs entries.
4651 */
4652 int bond_create(struct net *net, const char *name)
4653 {
4654 struct net_device *bond_dev;
4655 struct bonding *bond;
4656 struct alb_bond_info *bond_info;
4657 int res;
4658
4659 rtnl_lock();
4660
4661 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4662 name ? name : "bond%d", NET_NAME_UNKNOWN,
4663 bond_setup, tx_queues);
4664 if (!bond_dev) {
4665 pr_err("%s: eek! can't alloc netdev!\n", name);
4666 rtnl_unlock();
4667 return -ENOMEM;
4668 }
4669
4670 /*
4671 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4672 * It is set to 0 by default which is wrong.
4673 */
4674 bond = netdev_priv(bond_dev);
4675 bond_info = &(BOND_ALB_INFO(bond));
4676 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4677
4678 dev_net_set(bond_dev, net);
4679 bond_dev->rtnl_link_ops = &bond_link_ops;
4680
4681 res = register_netdevice(bond_dev);
4682
4683 netif_carrier_off(bond_dev);
4684
4685 rtnl_unlock();
4686 if (res < 0)
4687 bond_destructor(bond_dev);
4688 return res;
4689 }
4690
4691 static int __net_init bond_net_init(struct net *net)
4692 {
4693 struct bond_net *bn = net_generic(net, bond_net_id);
4694
4695 bn->net = net;
4696 INIT_LIST_HEAD(&bn->dev_list);
4697
4698 bond_create_proc_dir(bn);
4699 bond_create_sysfs(bn);
4700
4701 return 0;
4702 }
4703
4704 static void __net_exit bond_net_exit(struct net *net)
4705 {
4706 struct bond_net *bn = net_generic(net, bond_net_id);
4707 struct bonding *bond, *tmp_bond;
4708 LIST_HEAD(list);
4709
4710 bond_destroy_sysfs(bn);
4711
4712 /* Kill off any bonds created after unregistering bond rtnl ops */
4713 rtnl_lock();
4714 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4715 unregister_netdevice_queue(bond->dev, &list);
4716 unregister_netdevice_many(&list);
4717 rtnl_unlock();
4718
4719 bond_destroy_proc_dir(bn);
4720 }
4721
4722 static struct pernet_operations bond_net_ops = {
4723 .init = bond_net_init,
4724 .exit = bond_net_exit,
4725 .id = &bond_net_id,
4726 .size = sizeof(struct bond_net),
4727 };
4728
4729 static int __init bonding_init(void)
4730 {
4731 int i;
4732 int res;
4733
4734 pr_info("%s", bond_version);
4735
4736 res = bond_check_params(&bonding_defaults);
4737 if (res)
4738 goto out;
4739
4740 res = register_pernet_subsys(&bond_net_ops);
4741 if (res)
4742 goto out;
4743
4744 res = bond_netlink_init();
4745 if (res)
4746 goto err_link;
4747
4748 bond_create_debugfs();
4749
4750 for (i = 0; i < max_bonds; i++) {
4751 res = bond_create(&init_net, NULL);
4752 if (res)
4753 goto err;
4754 }
4755
4756 register_netdevice_notifier(&bond_netdev_notifier);
4757 out:
4758 return res;
4759 err:
4760 bond_destroy_debugfs();
4761 bond_netlink_fini();
4762 err_link:
4763 unregister_pernet_subsys(&bond_net_ops);
4764 goto out;
4765
4766 }
4767
4768 static void __exit bonding_exit(void)
4769 {
4770 unregister_netdevice_notifier(&bond_netdev_notifier);
4771
4772 bond_destroy_debugfs();
4773
4774 bond_netlink_fini();
4775 unregister_pernet_subsys(&bond_net_ops);
4776
4777 #ifdef CONFIG_NET_POLL_CONTROLLER
4778 /* Make sure we don't have an imbalance on our netpoll blocking */
4779 WARN_ON(atomic_read(&netpoll_block_tx));
4780 #endif
4781 }
4782
4783 module_init(bonding_init);
4784 module_exit(bonding_exit);
4785 MODULE_LICENSE("GPL");
4786 MODULE_VERSION(DRV_VERSION);
4787 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4788 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
Linux kernel - Deliverables
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