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bonding: fix the err path for dev hwaddr sync in bond_enslave
[linux/fpc-iii.git] / drivers / net / bonding / bond_main.c
blob0c299de4f2ef34d5d134821b7bc3a9d9e8b481c1
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, "802.3ad 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 unsigned int bond_net_id __read_mostly;
203
204 /*-------------------------- Forward declarations ---------------------------*/
205
206 static int bond_init(struct net_device *bond_dev);
207 static void bond_uninit(struct net_device *bond_dev);
208 static void bond_get_stats(struct net_device *bond_dev,
209 struct rtnl_link_stats64 *stats);
210 static void bond_slave_arr_handler(struct work_struct *work);
211 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
212 int mod);
213
214 /*---------------------------- General routines -----------------------------*/
215
216 const char *bond_mode_name(int mode)
217 {
218 static const char *names[] = {
219 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
220 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
221 [BOND_MODE_XOR] = "load balancing (xor)",
222 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
223 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
224 [BOND_MODE_TLB] = "transmit load balancing",
225 [BOND_MODE_ALB] = "adaptive load balancing",
226 };
227
228 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
229 return "unknown";
230
231 return names[mode];
232 }
233
234 /*---------------------------------- VLAN -----------------------------------*/
235
236 /**
237 * bond_dev_queue_xmit - Prepare skb for xmit.
238 *
239 * @bond: bond device that got this skb for tx.
240 * @skb: hw accel VLAN tagged skb to transmit
241 * @slave_dev: slave that is supposed to xmit this skbuff
242 */
243 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
244 struct net_device *slave_dev)
245 {
246 skb->dev = slave_dev;
247
248 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
249 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
250 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
251
252 if (unlikely(netpoll_tx_running(bond->dev)))
253 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
254 else
255 dev_queue_xmit(skb);
256 }
257
258 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
259 * We don't protect the slave list iteration with a lock because:
260 * a. This operation is performed in IOCTL context,
261 * b. The operation is protected by the RTNL semaphore in the 8021q code,
262 * c. Holding a lock with BH disabled while directly calling a base driver
263 * entry point is generally a BAD idea.
264 *
265 * The design of synchronization/protection for this operation in the 8021q
266 * module is good for one or more VLAN devices over a single physical device
267 * and cannot be extended for a teaming solution like bonding, so there is a
268 * potential race condition here where a net device from the vlan group might
269 * be referenced (either by a base driver or the 8021q code) while it is being
270 * removed from the system. However, it turns out we're not making matters
271 * worse, and if it works for regular VLAN usage it will work here too.
272 */
273
274 /**
275 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
276 * @bond_dev: bonding net device that got called
277 * @vid: vlan id being added
278 */
279 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
280 __be16 proto, u16 vid)
281 {
282 struct bonding *bond = netdev_priv(bond_dev);
283 struct slave *slave, *rollback_slave;
284 struct list_head *iter;
285 int res;
286
287 bond_for_each_slave(bond, slave, iter) {
288 res = vlan_vid_add(slave->dev, proto, vid);
289 if (res)
290 goto unwind;
291 }
292
293 return 0;
294
295 unwind:
296 /* unwind to the slave that failed */
297 bond_for_each_slave(bond, rollback_slave, iter) {
298 if (rollback_slave == slave)
299 break;
300
301 vlan_vid_del(rollback_slave->dev, proto, vid);
302 }
303
304 return res;
305 }
306
307 /**
308 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
309 * @bond_dev: bonding net device that got called
310 * @vid: vlan id being removed
311 */
312 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
313 __be16 proto, u16 vid)
314 {
315 struct bonding *bond = netdev_priv(bond_dev);
316 struct list_head *iter;
317 struct slave *slave;
318
319 bond_for_each_slave(bond, slave, iter)
320 vlan_vid_del(slave->dev, proto, vid);
321
322 if (bond_is_lb(bond))
323 bond_alb_clear_vlan(bond, vid);
324
325 return 0;
326 }
327
328 /*------------------------------- Link status -------------------------------*/
329
330 /* Set the carrier state for the master according to the state of its
331 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
332 * do special 802.3ad magic.
333 *
334 * Returns zero if carrier state does not change, nonzero if it does.
335 */
336 int bond_set_carrier(struct bonding *bond)
337 {
338 struct list_head *iter;
339 struct slave *slave;
340
341 if (!bond_has_slaves(bond))
342 goto down;
343
344 if (BOND_MODE(bond) == BOND_MODE_8023AD)
345 return bond_3ad_set_carrier(bond);
346
347 bond_for_each_slave(bond, slave, iter) {
348 if (slave->link == BOND_LINK_UP) {
349 if (!netif_carrier_ok(bond->dev)) {
350 netif_carrier_on(bond->dev);
351 return 1;
352 }
353 return 0;
354 }
355 }
356
357 down:
358 if (netif_carrier_ok(bond->dev)) {
359 netif_carrier_off(bond->dev);
360 return 1;
361 }
362 return 0;
363 }
364
365 /* Get link speed and duplex from the slave's base driver
366 * using ethtool. If for some reason the call fails or the
367 * values are invalid, set speed and duplex to -1,
368 * and return. Return 1 if speed or duplex settings are
369 * UNKNOWN; 0 otherwise.
370 */
371 static int bond_update_speed_duplex(struct slave *slave)
372 {
373 struct net_device *slave_dev = slave->dev;
374 struct ethtool_link_ksettings ecmd;
375 int res;
376
377 slave->speed = SPEED_UNKNOWN;
378 slave->duplex = DUPLEX_UNKNOWN;
379
380 res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
381 if (res < 0)
382 return 1;
383 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
384 return 1;
385 switch (ecmd.base.duplex) {
386 case DUPLEX_FULL:
387 case DUPLEX_HALF:
388 break;
389 default:
390 return 1;
391 }
392
393 slave->speed = ecmd.base.speed;
394 slave->duplex = ecmd.base.duplex;
395
396 return 0;
397 }
398
399 const char *bond_slave_link_status(s8 link)
400 {
401 switch (link) {
402 case BOND_LINK_UP:
403 return "up";
404 case BOND_LINK_FAIL:
405 return "going down";
406 case BOND_LINK_DOWN:
407 return "down";
408 case BOND_LINK_BACK:
409 return "going back";
410 default:
411 return "unknown";
412 }
413 }
414
415 /* if <dev> supports MII link status reporting, check its link status.
416 *
417 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
418 * depending upon the setting of the use_carrier parameter.
419 *
420 * Return either BMSR_LSTATUS, meaning that the link is up (or we
421 * can't tell and just pretend it is), or 0, meaning that the link is
422 * down.
423 *
424 * If reporting is non-zero, instead of faking link up, return -1 if
425 * both ETHTOOL and MII ioctls fail (meaning the device does not
426 * support them). If use_carrier is set, return whatever it says.
427 * It'd be nice if there was a good way to tell if a driver supports
428 * netif_carrier, but there really isn't.
429 */
430 static int bond_check_dev_link(struct bonding *bond,
431 struct net_device *slave_dev, int reporting)
432 {
433 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
434 int (*ioctl)(struct net_device *, struct ifreq *, int);
435 struct ifreq ifr;
436 struct mii_ioctl_data *mii;
437
438 if (!reporting && !netif_running(slave_dev))
439 return 0;
440
441 if (bond->params.use_carrier)
442 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
443
444 /* Try to get link status using Ethtool first. */
445 if (slave_dev->ethtool_ops->get_link)
446 return slave_dev->ethtool_ops->get_link(slave_dev) ?
447 BMSR_LSTATUS : 0;
448
449 /* Ethtool can't be used, fallback to MII ioctls. */
450 ioctl = slave_ops->ndo_do_ioctl;
451 if (ioctl) {
452 /* TODO: set pointer to correct ioctl on a per team member
453 * bases to make this more efficient. that is, once
454 * we determine the correct ioctl, we will always
455 * call it and not the others for that team
456 * member.
457 */
458
459 /* We cannot assume that SIOCGMIIPHY will also read a
460 * register; not all network drivers (e.g., e100)
461 * support that.
462 */
463
464 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
465 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
466 mii = if_mii(&ifr);
467 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
468 mii->reg_num = MII_BMSR;
469 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
470 return mii->val_out & BMSR_LSTATUS;
471 }
472 }
473
474 /* If reporting, report that either there's no dev->do_ioctl,
475 * or both SIOCGMIIREG and get_link failed (meaning that we
476 * cannot report link status). If not reporting, pretend
477 * we're ok.
478 */
479 return reporting ? -1 : BMSR_LSTATUS;
480 }
481
482 /*----------------------------- Multicast list ------------------------------*/
483
484 /* Push the promiscuity flag down to appropriate slaves */
485 static int bond_set_promiscuity(struct bonding *bond, int inc)
486 {
487 struct list_head *iter;
488 int err = 0;
489
490 if (bond_uses_primary(bond)) {
491 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
492
493 if (curr_active)
494 err = dev_set_promiscuity(curr_active->dev, inc);
495 } else {
496 struct slave *slave;
497
498 bond_for_each_slave(bond, slave, iter) {
499 err = dev_set_promiscuity(slave->dev, inc);
500 if (err)
501 return err;
502 }
503 }
504 return err;
505 }
506
507 /* Push the allmulti flag down to all slaves */
508 static int bond_set_allmulti(struct bonding *bond, int inc)
509 {
510 struct list_head *iter;
511 int err = 0;
512
513 if (bond_uses_primary(bond)) {
514 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
515
516 if (curr_active)
517 err = dev_set_allmulti(curr_active->dev, inc);
518 } else {
519 struct slave *slave;
520
521 bond_for_each_slave(bond, slave, iter) {
522 err = dev_set_allmulti(slave->dev, inc);
523 if (err)
524 return err;
525 }
526 }
527 return err;
528 }
529
530 /* Retrieve the list of registered multicast addresses for the bonding
531 * device and retransmit an IGMP JOIN request to the current active
532 * slave.
533 */
534 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
535 {
536 struct bonding *bond = container_of(work, struct bonding,
537 mcast_work.work);
538
539 if (!rtnl_trylock()) {
540 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
541 return;
542 }
543 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
544
545 if (bond->igmp_retrans > 1) {
546 bond->igmp_retrans--;
547 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
548 }
549 rtnl_unlock();
550 }
551
552 /* Flush bond's hardware addresses from slave */
553 static void bond_hw_addr_flush(struct net_device *bond_dev,
554 struct net_device *slave_dev)
555 {
556 struct bonding *bond = netdev_priv(bond_dev);
557
558 dev_uc_unsync(slave_dev, bond_dev);
559 dev_mc_unsync(slave_dev, bond_dev);
560
561 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
562 /* del lacpdu mc addr from mc list */
563 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
564
565 dev_mc_del(slave_dev, lacpdu_multicast);
566 }
567 }
568
569 /*--------------------------- Active slave change ---------------------------*/
570
571 /* Update the hardware address list and promisc/allmulti for the new and
572 * old active slaves (if any). Modes that are not using primary keep all
573 * slaves up date at all times; only the modes that use primary need to call
574 * this function to swap these settings during a failover.
575 */
576 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
577 struct slave *old_active)
578 {
579 if (old_active) {
580 if (bond->dev->flags & IFF_PROMISC)
581 dev_set_promiscuity(old_active->dev, -1);
582
583 if (bond->dev->flags & IFF_ALLMULTI)
584 dev_set_allmulti(old_active->dev, -1);
585
586 bond_hw_addr_flush(bond->dev, old_active->dev);
587 }
588
589 if (new_active) {
590 /* FIXME: Signal errors upstream. */
591 if (bond->dev->flags & IFF_PROMISC)
592 dev_set_promiscuity(new_active->dev, 1);
593
594 if (bond->dev->flags & IFF_ALLMULTI)
595 dev_set_allmulti(new_active->dev, 1);
596
597 netif_addr_lock_bh(bond->dev);
598 dev_uc_sync(new_active->dev, bond->dev);
599 dev_mc_sync(new_active->dev, bond->dev);
600 netif_addr_unlock_bh(bond->dev);
601 }
602 }
603
604 /**
605 * bond_set_dev_addr - clone slave's address to bond
606 * @bond_dev: bond net device
607 * @slave_dev: slave net device
608 *
609 * Should be called with RTNL held.
610 */
611 static void bond_set_dev_addr(struct net_device *bond_dev,
612 struct net_device *slave_dev)
613 {
614 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n",
615 bond_dev, slave_dev, slave_dev->name, slave_dev->addr_len);
616 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
617 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
618 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
619 }
620
621 static struct slave *bond_get_old_active(struct bonding *bond,
622 struct slave *new_active)
623 {
624 struct slave *slave;
625 struct list_head *iter;
626
627 bond_for_each_slave(bond, slave, iter) {
628 if (slave == new_active)
629 continue;
630
631 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
632 return slave;
633 }
634
635 return NULL;
636 }
637
638 /* bond_do_fail_over_mac
639 *
640 * Perform special MAC address swapping for fail_over_mac settings
641 *
642 * Called with RTNL
643 */
644 static void bond_do_fail_over_mac(struct bonding *bond,
645 struct slave *new_active,
646 struct slave *old_active)
647 {
648 u8 tmp_mac[MAX_ADDR_LEN];
649 struct sockaddr_storage ss;
650 int rv;
651
652 switch (bond->params.fail_over_mac) {
653 case BOND_FOM_ACTIVE:
654 if (new_active)
655 bond_set_dev_addr(bond->dev, new_active->dev);
656 break;
657 case BOND_FOM_FOLLOW:
658 /* if new_active && old_active, swap them
659 * if just old_active, do nothing (going to no active slave)
660 * if just new_active, set new_active to bond's MAC
661 */
662 if (!new_active)
663 return;
664
665 if (!old_active)
666 old_active = bond_get_old_active(bond, new_active);
667
668 if (old_active) {
669 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
670 new_active->dev->addr_len);
671 bond_hw_addr_copy(ss.__data,
672 old_active->dev->dev_addr,
673 old_active->dev->addr_len);
674 ss.ss_family = new_active->dev->type;
675 } else {
676 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
677 bond->dev->addr_len);
678 ss.ss_family = bond->dev->type;
679 }
680
681 rv = dev_set_mac_address(new_active->dev,
682 (struct sockaddr *)&ss);
683 if (rv) {
684 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
685 -rv, new_active->dev->name);
686 goto out;
687 }
688
689 if (!old_active)
690 goto out;
691
692 bond_hw_addr_copy(ss.__data, tmp_mac,
693 new_active->dev->addr_len);
694 ss.ss_family = old_active->dev->type;
695
696 rv = dev_set_mac_address(old_active->dev,
697 (struct sockaddr *)&ss);
698 if (rv)
699 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
700 -rv, new_active->dev->name);
701 out:
702 break;
703 default:
704 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
705 bond->params.fail_over_mac);
706 break;
707 }
708
709 }
710
711 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
712 {
713 struct slave *prim = rtnl_dereference(bond->primary_slave);
714 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
715
716 if (!prim || prim->link != BOND_LINK_UP) {
717 if (!curr || curr->link != BOND_LINK_UP)
718 return NULL;
719 return curr;
720 }
721
722 if (bond->force_primary) {
723 bond->force_primary = false;
724 return prim;
725 }
726
727 if (!curr || curr->link != BOND_LINK_UP)
728 return prim;
729
730 /* At this point, prim and curr are both up */
731 switch (bond->params.primary_reselect) {
732 case BOND_PRI_RESELECT_ALWAYS:
733 return prim;
734 case BOND_PRI_RESELECT_BETTER:
735 if (prim->speed < curr->speed)
736 return curr;
737 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
738 return curr;
739 return prim;
740 case BOND_PRI_RESELECT_FAILURE:
741 return curr;
742 default:
743 netdev_err(bond->dev, "impossible primary_reselect %d\n",
744 bond->params.primary_reselect);
745 return curr;
746 }
747 }
748
749 /**
750 * bond_find_best_slave - select the best available slave to be the active one
751 * @bond: our bonding struct
752 */
753 static struct slave *bond_find_best_slave(struct bonding *bond)
754 {
755 struct slave *slave, *bestslave = NULL;
756 struct list_head *iter;
757 int mintime = bond->params.updelay;
758
759 slave = bond_choose_primary_or_current(bond);
760 if (slave)
761 return slave;
762
763 bond_for_each_slave(bond, slave, iter) {
764 if (slave->link == BOND_LINK_UP)
765 return slave;
766 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
767 slave->delay < mintime) {
768 mintime = slave->delay;
769 bestslave = slave;
770 }
771 }
772
773 return bestslave;
774 }
775
776 static bool bond_should_notify_peers(struct bonding *bond)
777 {
778 struct slave *slave;
779
780 rcu_read_lock();
781 slave = rcu_dereference(bond->curr_active_slave);
782 rcu_read_unlock();
783
784 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
785 slave ? slave->dev->name : "NULL");
786
787 if (!slave || !bond->send_peer_notif ||
788 !netif_carrier_ok(bond->dev) ||
789 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
790 return false;
791
792 return true;
793 }
794
795 /**
796 * change_active_interface - change the active slave into the specified one
797 * @bond: our bonding struct
798 * @new: the new slave to make the active one
799 *
800 * Set the new slave to the bond's settings and unset them on the old
801 * curr_active_slave.
802 * Setting include flags, mc-list, promiscuity, allmulti, etc.
803 *
804 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
805 * because it is apparently the best available slave we have, even though its
806 * updelay hasn't timed out yet.
807 *
808 * Caller must hold RTNL.
809 */
810 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
811 {
812 struct slave *old_active;
813
814 ASSERT_RTNL();
815
816 old_active = rtnl_dereference(bond->curr_active_slave);
817
818 if (old_active == new_active)
819 return;
820
821 if (new_active) {
822 new_active->last_link_up = jiffies;
823
824 if (new_active->link == BOND_LINK_BACK) {
825 if (bond_uses_primary(bond)) {
826 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
827 new_active->dev->name,
828 (bond->params.updelay - new_active->delay) * bond->params.miimon);
829 }
830
831 new_active->delay = 0;
832 bond_set_slave_link_state(new_active, BOND_LINK_UP,
833 BOND_SLAVE_NOTIFY_NOW);
834
835 if (BOND_MODE(bond) == BOND_MODE_8023AD)
836 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
837
838 if (bond_is_lb(bond))
839 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
840 } else {
841 if (bond_uses_primary(bond)) {
842 netdev_info(bond->dev, "making interface %s the new active one\n",
843 new_active->dev->name);
844 }
845 }
846 }
847
848 if (bond_uses_primary(bond))
849 bond_hw_addr_swap(bond, new_active, old_active);
850
851 if (bond_is_lb(bond)) {
852 bond_alb_handle_active_change(bond, new_active);
853 if (old_active)
854 bond_set_slave_inactive_flags(old_active,
855 BOND_SLAVE_NOTIFY_NOW);
856 if (new_active)
857 bond_set_slave_active_flags(new_active,
858 BOND_SLAVE_NOTIFY_NOW);
859 } else {
860 rcu_assign_pointer(bond->curr_active_slave, new_active);
861 }
862
863 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
864 if (old_active)
865 bond_set_slave_inactive_flags(old_active,
866 BOND_SLAVE_NOTIFY_NOW);
867
868 if (new_active) {
869 bool should_notify_peers = false;
870
871 bond_set_slave_active_flags(new_active,
872 BOND_SLAVE_NOTIFY_NOW);
873
874 if (bond->params.fail_over_mac)
875 bond_do_fail_over_mac(bond, new_active,
876 old_active);
877
878 if (netif_running(bond->dev)) {
879 bond->send_peer_notif =
880 bond->params.num_peer_notif;
881 should_notify_peers =
882 bond_should_notify_peers(bond);
883 }
884
885 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
886 if (should_notify_peers)
887 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
888 bond->dev);
889 }
890 }
891
892 /* resend IGMP joins since active slave has changed or
893 * all were sent on curr_active_slave.
894 * resend only if bond is brought up with the affected
895 * bonding modes and the retransmission is enabled
896 */
897 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
898 ((bond_uses_primary(bond) && new_active) ||
899 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
900 bond->igmp_retrans = bond->params.resend_igmp;
901 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
902 }
903 }
904
905 /**
906 * bond_select_active_slave - select a new active slave, if needed
907 * @bond: our bonding struct
908 *
909 * This functions should be called when one of the following occurs:
910 * - The old curr_active_slave has been released or lost its link.
911 * - The primary_slave has got its link back.
912 * - A slave has got its link back and there's no old curr_active_slave.
913 *
914 * Caller must hold RTNL.
915 */
916 void bond_select_active_slave(struct bonding *bond)
917 {
918 struct slave *best_slave;
919 int rv;
920
921 ASSERT_RTNL();
922
923 best_slave = bond_find_best_slave(bond);
924 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
925 bond_change_active_slave(bond, best_slave);
926 rv = bond_set_carrier(bond);
927 if (!rv)
928 return;
929
930 if (netif_carrier_ok(bond->dev))
931 netdev_info(bond->dev, "first active interface up!\n");
932 else
933 netdev_info(bond->dev, "now running without any active interface!\n");
934 }
935 }
936
937 #ifdef CONFIG_NET_POLL_CONTROLLER
938 static inline int slave_enable_netpoll(struct slave *slave)
939 {
940 struct netpoll *np;
941 int err = 0;
942
943 np = kzalloc(sizeof(*np), GFP_KERNEL);
944 err = -ENOMEM;
945 if (!np)
946 goto out;
947
948 err = __netpoll_setup(np, slave->dev);
949 if (err) {
950 kfree(np);
951 goto out;
952 }
953 slave->np = np;
954 out:
955 return err;
956 }
957 static inline void slave_disable_netpoll(struct slave *slave)
958 {
959 struct netpoll *np = slave->np;
960
961 if (!np)
962 return;
963
964 slave->np = NULL;
965 __netpoll_free_async(np);
966 }
967
968 static void bond_poll_controller(struct net_device *bond_dev)
969 {
970 struct bonding *bond = netdev_priv(bond_dev);
971 struct slave *slave = NULL;
972 struct list_head *iter;
973 struct ad_info ad_info;
974 struct netpoll_info *ni;
975 const struct net_device_ops *ops;
976
977 if (BOND_MODE(bond) == BOND_MODE_8023AD)
978 if (bond_3ad_get_active_agg_info(bond, &ad_info))
979 return;
980
981 bond_for_each_slave_rcu(bond, slave, iter) {
982 ops = slave->dev->netdev_ops;
983 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
984 continue;
985
986 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
987 struct aggregator *agg =
988 SLAVE_AD_INFO(slave)->port.aggregator;
989
990 if (agg &&
991 agg->aggregator_identifier != ad_info.aggregator_id)
992 continue;
993 }
994
995 ni = rcu_dereference_bh(slave->dev->npinfo);
996 if (down_trylock(&ni->dev_lock))
997 continue;
998 ops->ndo_poll_controller(slave->dev);
999 up(&ni->dev_lock);
1000 }
1001 }
1002
1003 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1004 {
1005 struct bonding *bond = netdev_priv(bond_dev);
1006 struct list_head *iter;
1007 struct slave *slave;
1008
1009 bond_for_each_slave(bond, slave, iter)
1010 if (bond_slave_is_up(slave))
1011 slave_disable_netpoll(slave);
1012 }
1013
1014 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1015 {
1016 struct bonding *bond = netdev_priv(dev);
1017 struct list_head *iter;
1018 struct slave *slave;
1019 int err = 0;
1020
1021 bond_for_each_slave(bond, slave, iter) {
1022 err = slave_enable_netpoll(slave);
1023 if (err) {
1024 bond_netpoll_cleanup(dev);
1025 break;
1026 }
1027 }
1028 return err;
1029 }
1030 #else
1031 static inline int slave_enable_netpoll(struct slave *slave)
1032 {
1033 return 0;
1034 }
1035 static inline void slave_disable_netpoll(struct slave *slave)
1036 {
1037 }
1038 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1039 {
1040 }
1041 #endif
1042
1043 /*---------------------------------- IOCTL ----------------------------------*/
1044
1045 static netdev_features_t bond_fix_features(struct net_device *dev,
1046 netdev_features_t features)
1047 {
1048 struct bonding *bond = netdev_priv(dev);
1049 struct list_head *iter;
1050 netdev_features_t mask;
1051 struct slave *slave;
1052
1053 mask = features;
1054
1055 features &= ~NETIF_F_ONE_FOR_ALL;
1056 features |= NETIF_F_ALL_FOR_ALL;
1057
1058 bond_for_each_slave(bond, slave, iter) {
1059 features = netdev_increment_features(features,
1060 slave->dev->features,
1061 mask);
1062 }
1063 features = netdev_add_tso_features(features, mask);
1064
1065 return features;
1066 }
1067
1068 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1069 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1070 NETIF_F_HIGHDMA | NETIF_F_LRO)
1071
1072 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1073 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1074
1075 static void bond_compute_features(struct bonding *bond)
1076 {
1077 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1078 IFF_XMIT_DST_RELEASE_PERM;
1079 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1080 netdev_features_t enc_features = BOND_ENC_FEATURES;
1081 struct net_device *bond_dev = bond->dev;
1082 struct list_head *iter;
1083 struct slave *slave;
1084 unsigned short max_hard_header_len = ETH_HLEN;
1085 unsigned int gso_max_size = GSO_MAX_SIZE;
1086 u16 gso_max_segs = GSO_MAX_SEGS;
1087
1088 if (!bond_has_slaves(bond))
1089 goto done;
1090 vlan_features &= NETIF_F_ALL_FOR_ALL;
1091
1092 bond_for_each_slave(bond, slave, iter) {
1093 vlan_features = netdev_increment_features(vlan_features,
1094 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1095
1096 enc_features = netdev_increment_features(enc_features,
1097 slave->dev->hw_enc_features,
1098 BOND_ENC_FEATURES);
1099 dst_release_flag &= slave->dev->priv_flags;
1100 if (slave->dev->hard_header_len > max_hard_header_len)
1101 max_hard_header_len = slave->dev->hard_header_len;
1102
1103 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1104 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1105 }
1106 bond_dev->hard_header_len = max_hard_header_len;
1107
1108 done:
1109 bond_dev->vlan_features = vlan_features;
1110 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1111 bond_dev->gso_max_segs = gso_max_segs;
1112 netif_set_gso_max_size(bond_dev, gso_max_size);
1113
1114 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1115 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1116 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1117 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1118
1119 netdev_change_features(bond_dev);
1120 }
1121
1122 static void bond_setup_by_slave(struct net_device *bond_dev,
1123 struct net_device *slave_dev)
1124 {
1125 bond_dev->header_ops = slave_dev->header_ops;
1126
1127 bond_dev->type = slave_dev->type;
1128 bond_dev->hard_header_len = slave_dev->hard_header_len;
1129 bond_dev->addr_len = slave_dev->addr_len;
1130
1131 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1132 slave_dev->addr_len);
1133 }
1134
1135 /* On bonding slaves other than the currently active slave, suppress
1136 * duplicates except for alb non-mcast/bcast.
1137 */
1138 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1139 struct slave *slave,
1140 struct bonding *bond)
1141 {
1142 if (bond_is_slave_inactive(slave)) {
1143 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1144 skb->pkt_type != PACKET_BROADCAST &&
1145 skb->pkt_type != PACKET_MULTICAST)
1146 return false;
1147 return true;
1148 }
1149 return false;
1150 }
1151
1152 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1153 {
1154 struct sk_buff *skb = *pskb;
1155 struct slave *slave;
1156 struct bonding *bond;
1157 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1158 struct slave *);
1159 int ret = RX_HANDLER_ANOTHER;
1160
1161 skb = skb_share_check(skb, GFP_ATOMIC);
1162 if (unlikely(!skb))
1163 return RX_HANDLER_CONSUMED;
1164
1165 *pskb = skb;
1166
1167 slave = bond_slave_get_rcu(skb->dev);
1168 bond = slave->bond;
1169
1170 recv_probe = READ_ONCE(bond->recv_probe);
1171 if (recv_probe) {
1172 ret = recv_probe(skb, bond, slave);
1173 if (ret == RX_HANDLER_CONSUMED) {
1174 consume_skb(skb);
1175 return ret;
1176 }
1177 }
1178
1179 /* don't change skb->dev for link-local packets */
1180 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1181 return RX_HANDLER_PASS;
1182 if (bond_should_deliver_exact_match(skb, slave, bond))
1183 return RX_HANDLER_EXACT;
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 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1197 bond->dev->addr_len);
1198 }
1199
1200 return ret;
1201 }
1202
1203 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1204 {
1205 switch (BOND_MODE(bond)) {
1206 case BOND_MODE_ROUNDROBIN:
1207 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1208 case BOND_MODE_ACTIVEBACKUP:
1209 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1210 case BOND_MODE_BROADCAST:
1211 return NETDEV_LAG_TX_TYPE_BROADCAST;
1212 case BOND_MODE_XOR:
1213 case BOND_MODE_8023AD:
1214 return NETDEV_LAG_TX_TYPE_HASH;
1215 default:
1216 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1217 }
1218 }
1219
1220 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1221 struct netlink_ext_ack *extack)
1222 {
1223 struct netdev_lag_upper_info lag_upper_info;
1224
1225 lag_upper_info.tx_type = bond_lag_tx_type(bond);
1226
1227 return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1228 &lag_upper_info, extack);
1229 }
1230
1231 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1232 {
1233 netdev_upper_dev_unlink(slave->dev, bond->dev);
1234 slave->dev->flags &= ~IFF_SLAVE;
1235 }
1236
1237 static struct slave *bond_alloc_slave(struct bonding *bond)
1238 {
1239 struct slave *slave = NULL;
1240
1241 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1242 if (!slave)
1243 return NULL;
1244
1245 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1246 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1247 GFP_KERNEL);
1248 if (!SLAVE_AD_INFO(slave)) {
1249 kfree(slave);
1250 return NULL;
1251 }
1252 }
1253 return slave;
1254 }
1255
1256 static void bond_free_slave(struct slave *slave)
1257 {
1258 struct bonding *bond = bond_get_bond_by_slave(slave);
1259
1260 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1261 kfree(SLAVE_AD_INFO(slave));
1262
1263 kfree(slave);
1264 }
1265
1266 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1267 {
1268 info->bond_mode = BOND_MODE(bond);
1269 info->miimon = bond->params.miimon;
1270 info->num_slaves = bond->slave_cnt;
1271 }
1272
1273 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1274 {
1275 strcpy(info->slave_name, slave->dev->name);
1276 info->link = slave->link;
1277 info->state = bond_slave_state(slave);
1278 info->link_failure_count = slave->link_failure_count;
1279 }
1280
1281 static void bond_netdev_notify(struct net_device *dev,
1282 struct netdev_bonding_info *info)
1283 {
1284 rtnl_lock();
1285 netdev_bonding_info_change(dev, info);
1286 rtnl_unlock();
1287 }
1288
1289 static void bond_netdev_notify_work(struct work_struct *_work)
1290 {
1291 struct netdev_notify_work *w =
1292 container_of(_work, struct netdev_notify_work, work.work);
1293
1294 bond_netdev_notify(w->dev, &w->bonding_info);
1295 dev_put(w->dev);
1296 kfree(w);
1297 }
1298
1299 void bond_queue_slave_event(struct slave *slave)
1300 {
1301 struct bonding *bond = slave->bond;
1302 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1303
1304 if (!nnw)
1305 return;
1306
1307 dev_hold(slave->dev);
1308 nnw->dev = slave->dev;
1309 bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1310 bond_fill_ifbond(bond, &nnw->bonding_info.master);
1311 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1312
1313 queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1314 }
1315
1316 void bond_lower_state_changed(struct slave *slave)
1317 {
1318 struct netdev_lag_lower_state_info info;
1319
1320 info.link_up = slave->link == BOND_LINK_UP ||
1321 slave->link == BOND_LINK_FAIL;
1322 info.tx_enabled = bond_is_active_slave(slave);
1323 netdev_lower_state_changed(slave->dev, &info);
1324 }
1325
1326 /* enslave device <slave> to bond device <master> */
1327 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1328 struct netlink_ext_ack *extack)
1329 {
1330 struct bonding *bond = netdev_priv(bond_dev);
1331 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1332 struct slave *new_slave = NULL, *prev_slave;
1333 struct sockaddr_storage ss;
1334 int link_reporting;
1335 int res = 0, i;
1336
1337 if (!bond->params.use_carrier &&
1338 slave_dev->ethtool_ops->get_link == NULL &&
1339 slave_ops->ndo_do_ioctl == NULL) {
1340 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1341 slave_dev->name);
1342 }
1343
1344 /* already in-use? */
1345 if (netdev_is_rx_handler_busy(slave_dev)) {
1346 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1347 netdev_err(bond_dev,
1348 "Error: Device is in use and cannot be enslaved\n");
1349 return -EBUSY;
1350 }
1351
1352 if (bond_dev == slave_dev) {
1353 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1354 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1355 return -EPERM;
1356 }
1357
1358 /* vlan challenged mutual exclusion */
1359 /* no need to lock since we're protected by rtnl_lock */
1360 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1361 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1362 slave_dev->name);
1363 if (vlan_uses_dev(bond_dev)) {
1364 NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1365 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1366 slave_dev->name, bond_dev->name);
1367 return -EPERM;
1368 } else {
1369 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1370 slave_dev->name, slave_dev->name,
1371 bond_dev->name);
1372 }
1373 } else {
1374 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1375 slave_dev->name);
1376 }
1377
1378 /* Old ifenslave binaries are no longer supported. These can
1379 * be identified with moderate accuracy by the state of the slave:
1380 * the current ifenslave will set the interface down prior to
1381 * enslaving it; the old ifenslave will not.
1382 */
1383 if (slave_dev->flags & IFF_UP) {
1384 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1385 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1386 slave_dev->name);
1387 return -EPERM;
1388 }
1389
1390 /* set bonding device ether type by slave - bonding netdevices are
1391 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1392 * there is a need to override some of the type dependent attribs/funcs.
1393 *
1394 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1395 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1396 */
1397 if (!bond_has_slaves(bond)) {
1398 if (bond_dev->type != slave_dev->type) {
1399 netdev_dbg(bond_dev, "change device type from %d to %d\n",
1400 bond_dev->type, slave_dev->type);
1401
1402 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1403 bond_dev);
1404 res = notifier_to_errno(res);
1405 if (res) {
1406 netdev_err(bond_dev, "refused to change device type\n");
1407 return -EBUSY;
1408 }
1409
1410 /* Flush unicast and multicast addresses */
1411 dev_uc_flush(bond_dev);
1412 dev_mc_flush(bond_dev);
1413
1414 if (slave_dev->type != ARPHRD_ETHER)
1415 bond_setup_by_slave(bond_dev, slave_dev);
1416 else {
1417 ether_setup(bond_dev);
1418 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1419 }
1420
1421 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1422 bond_dev);
1423 }
1424 } else if (bond_dev->type != slave_dev->type) {
1425 NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1426 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1427 slave_dev->name, slave_dev->type, bond_dev->type);
1428 return -EINVAL;
1429 }
1430
1431 if (slave_dev->type == ARPHRD_INFINIBAND &&
1432 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1433 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1434 netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n",
1435 slave_dev->type);
1436 res = -EOPNOTSUPP;
1437 goto err_undo_flags;
1438 }
1439
1440 if (!slave_ops->ndo_set_mac_address ||
1441 slave_dev->type == ARPHRD_INFINIBAND) {
1442 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1443 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1444 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1445 if (!bond_has_slaves(bond)) {
1446 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1447 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1448 } else {
1449 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1450 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");
1451 res = -EOPNOTSUPP;
1452 goto err_undo_flags;
1453 }
1454 }
1455 }
1456
1457 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1458
1459 /* If this is the first slave, then we need to set the master's hardware
1460 * address to be the same as the slave's.
1461 */
1462 if (!bond_has_slaves(bond) &&
1463 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1464 bond_set_dev_addr(bond->dev, slave_dev);
1465
1466 new_slave = bond_alloc_slave(bond);
1467 if (!new_slave) {
1468 res = -ENOMEM;
1469 goto err_undo_flags;
1470 }
1471
1472 new_slave->bond = bond;
1473 new_slave->dev = slave_dev;
1474 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1475 * is set via sysfs or module option if desired.
1476 */
1477 new_slave->queue_id = 0;
1478
1479 /* Save slave's original mtu and then set it to match the bond */
1480 new_slave->original_mtu = slave_dev->mtu;
1481 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1482 if (res) {
1483 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1484 goto err_free;
1485 }
1486
1487 /* Save slave's original ("permanent") mac address for modes
1488 * that need it, and for restoring it upon release, and then
1489 * set it to the master's address
1490 */
1491 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1492 slave_dev->addr_len);
1493
1494 if (!bond->params.fail_over_mac ||
1495 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1496 /* Set slave to master's mac address. The application already
1497 * set the master's mac address to that of the first slave
1498 */
1499 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1500 ss.ss_family = slave_dev->type;
1501 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss);
1502 if (res) {
1503 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1504 goto err_restore_mtu;
1505 }
1506 }
1507
1508 /* set slave flag before open to prevent IPv6 addrconf */
1509 slave_dev->flags |= IFF_SLAVE;
1510
1511 /* open the slave since the application closed it */
1512 res = dev_open(slave_dev);
1513 if (res) {
1514 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1515 goto err_restore_mac;
1516 }
1517
1518 slave_dev->priv_flags |= IFF_BONDING;
1519 /* initialize slave stats */
1520 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1521
1522 if (bond_is_lb(bond)) {
1523 /* bond_alb_init_slave() must be called before all other stages since
1524 * it might fail and we do not want to have to undo everything
1525 */
1526 res = bond_alb_init_slave(bond, new_slave);
1527 if (res)
1528 goto err_close;
1529 }
1530
1531 /* If the mode uses primary, then the following is handled by
1532 * bond_change_active_slave().
1533 */
1534 if (!bond_uses_primary(bond)) {
1535 /* set promiscuity level to new slave */
1536 if (bond_dev->flags & IFF_PROMISC) {
1537 res = dev_set_promiscuity(slave_dev, 1);
1538 if (res)
1539 goto err_close;
1540 }
1541
1542 /* set allmulti level to new slave */
1543 if (bond_dev->flags & IFF_ALLMULTI) {
1544 res = dev_set_allmulti(slave_dev, 1);
1545 if (res)
1546 goto err_close;
1547 }
1548
1549 netif_addr_lock_bh(bond_dev);
1550
1551 dev_mc_sync_multiple(slave_dev, bond_dev);
1552 dev_uc_sync_multiple(slave_dev, bond_dev);
1553
1554 netif_addr_unlock_bh(bond_dev);
1555 }
1556
1557 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1558 /* add lacpdu mc addr to mc list */
1559 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1560
1561 dev_mc_add(slave_dev, lacpdu_multicast);
1562 }
1563
1564 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1565 if (res) {
1566 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1567 slave_dev->name);
1568 goto err_hwaddr_unsync;
1569 }
1570
1571 prev_slave = bond_last_slave(bond);
1572
1573 new_slave->delay = 0;
1574 new_slave->link_failure_count = 0;
1575
1576 if (bond_update_speed_duplex(new_slave) &&
1577 bond_needs_speed_duplex(bond))
1578 new_slave->link = BOND_LINK_DOWN;
1579
1580 new_slave->last_rx = jiffies -
1581 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1582 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1583 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1584
1585 if (bond->params.miimon && !bond->params.use_carrier) {
1586 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1587
1588 if ((link_reporting == -1) && !bond->params.arp_interval) {
1589 /* miimon is set but a bonded network driver
1590 * does not support ETHTOOL/MII and
1591 * arp_interval is not set. Note: if
1592 * use_carrier is enabled, we will never go
1593 * here (because netif_carrier is always
1594 * supported); thus, we don't need to change
1595 * the messages for netif_carrier.
1596 */
1597 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",
1598 slave_dev->name);
1599 } else if (link_reporting == -1) {
1600 /* unable get link status using mii/ethtool */
1601 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",
1602 slave_dev->name);
1603 }
1604 }
1605
1606 /* check for initial state */
1607 new_slave->link = BOND_LINK_NOCHANGE;
1608 if (bond->params.miimon) {
1609 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1610 if (bond->params.updelay) {
1611 bond_set_slave_link_state(new_slave,
1612 BOND_LINK_BACK,
1613 BOND_SLAVE_NOTIFY_NOW);
1614 new_slave->delay = bond->params.updelay;
1615 } else {
1616 bond_set_slave_link_state(new_slave,
1617 BOND_LINK_UP,
1618 BOND_SLAVE_NOTIFY_NOW);
1619 }
1620 } else {
1621 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1622 BOND_SLAVE_NOTIFY_NOW);
1623 }
1624 } else if (bond->params.arp_interval) {
1625 bond_set_slave_link_state(new_slave,
1626 (netif_carrier_ok(slave_dev) ?
1627 BOND_LINK_UP : BOND_LINK_DOWN),
1628 BOND_SLAVE_NOTIFY_NOW);
1629 } else {
1630 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1631 BOND_SLAVE_NOTIFY_NOW);
1632 }
1633
1634 if (new_slave->link != BOND_LINK_DOWN)
1635 new_slave->last_link_up = jiffies;
1636 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1637 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1638 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1639
1640 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1641 /* if there is a primary slave, remember it */
1642 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1643 rcu_assign_pointer(bond->primary_slave, new_slave);
1644 bond->force_primary = true;
1645 }
1646 }
1647
1648 switch (BOND_MODE(bond)) {
1649 case BOND_MODE_ACTIVEBACKUP:
1650 bond_set_slave_inactive_flags(new_slave,
1651 BOND_SLAVE_NOTIFY_NOW);
1652 break;
1653 case BOND_MODE_8023AD:
1654 /* in 802.3ad mode, the internal mechanism
1655 * will activate the slaves in the selected
1656 * aggregator
1657 */
1658 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1659 /* if this is the first slave */
1660 if (!prev_slave) {
1661 SLAVE_AD_INFO(new_slave)->id = 1;
1662 /* Initialize AD with the number of times that the AD timer is called in 1 second
1663 * can be called only after the mac address of the bond is set
1664 */
1665 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1666 } else {
1667 SLAVE_AD_INFO(new_slave)->id =
1668 SLAVE_AD_INFO(prev_slave)->id + 1;
1669 }
1670
1671 bond_3ad_bind_slave(new_slave);
1672 break;
1673 case BOND_MODE_TLB:
1674 case BOND_MODE_ALB:
1675 bond_set_active_slave(new_slave);
1676 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1677 break;
1678 default:
1679 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1680
1681 /* always active in trunk mode */
1682 bond_set_active_slave(new_slave);
1683
1684 /* In trunking mode there is little meaning to curr_active_slave
1685 * anyway (it holds no special properties of the bond device),
1686 * so we can change it without calling change_active_interface()
1687 */
1688 if (!rcu_access_pointer(bond->curr_active_slave) &&
1689 new_slave->link == BOND_LINK_UP)
1690 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1691
1692 break;
1693 } /* switch(bond_mode) */
1694
1695 #ifdef CONFIG_NET_POLL_CONTROLLER
1696 slave_dev->npinfo = bond->dev->npinfo;
1697 if (slave_dev->npinfo) {
1698 if (slave_enable_netpoll(new_slave)) {
1699 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1700 res = -EBUSY;
1701 goto err_detach;
1702 }
1703 }
1704 #endif
1705
1706 if (!(bond_dev->features & NETIF_F_LRO))
1707 dev_disable_lro(slave_dev);
1708
1709 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1710 new_slave);
1711 if (res) {
1712 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1713 goto err_detach;
1714 }
1715
1716 res = bond_master_upper_dev_link(bond, new_slave, extack);
1717 if (res) {
1718 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1719 goto err_unregister;
1720 }
1721
1722 res = bond_sysfs_slave_add(new_slave);
1723 if (res) {
1724 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1725 goto err_upper_unlink;
1726 }
1727
1728 bond->slave_cnt++;
1729 bond_compute_features(bond);
1730 bond_set_carrier(bond);
1731
1732 if (bond_uses_primary(bond)) {
1733 block_netpoll_tx();
1734 bond_select_active_slave(bond);
1735 unblock_netpoll_tx();
1736 }
1737
1738 if (bond_mode_uses_xmit_hash(bond))
1739 bond_update_slave_arr(bond, NULL);
1740
1741 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1742 slave_dev->name,
1743 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1744 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1745
1746 /* enslave is successful */
1747 bond_queue_slave_event(new_slave);
1748 return 0;
1749
1750 /* Undo stages on error */
1751 err_upper_unlink:
1752 bond_upper_dev_unlink(bond, new_slave);
1753
1754 err_unregister:
1755 netdev_rx_handler_unregister(slave_dev);
1756
1757 err_detach:
1758 vlan_vids_del_by_dev(slave_dev, bond_dev);
1759 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1760 RCU_INIT_POINTER(bond->primary_slave, NULL);
1761 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1762 block_netpoll_tx();
1763 bond_change_active_slave(bond, NULL);
1764 bond_select_active_slave(bond);
1765 unblock_netpoll_tx();
1766 }
1767 /* either primary_slave or curr_active_slave might've changed */
1768 synchronize_rcu();
1769 slave_disable_netpoll(new_slave);
1770
1771 err_hwaddr_unsync:
1772 if (!bond_uses_primary(bond))
1773 bond_hw_addr_flush(bond_dev, slave_dev);
1774
1775 err_close:
1776 slave_dev->priv_flags &= ~IFF_BONDING;
1777 dev_close(slave_dev);
1778
1779 err_restore_mac:
1780 slave_dev->flags &= ~IFF_SLAVE;
1781 if (!bond->params.fail_over_mac ||
1782 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1783 /* XXX TODO - fom follow mode needs to change master's
1784 * MAC if this slave's MAC is in use by the bond, or at
1785 * least print a warning.
1786 */
1787 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
1788 new_slave->dev->addr_len);
1789 ss.ss_family = slave_dev->type;
1790 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss);
1791 }
1792
1793 err_restore_mtu:
1794 dev_set_mtu(slave_dev, new_slave->original_mtu);
1795
1796 err_free:
1797 bond_free_slave(new_slave);
1798
1799 err_undo_flags:
1800 /* Enslave of first slave has failed and we need to fix master's mac */
1801 if (!bond_has_slaves(bond)) {
1802 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1803 slave_dev->dev_addr))
1804 eth_hw_addr_random(bond_dev);
1805 if (bond_dev->type != ARPHRD_ETHER) {
1806 dev_close(bond_dev);
1807 ether_setup(bond_dev);
1808 bond_dev->flags |= IFF_MASTER;
1809 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1810 }
1811 }
1812
1813 return res;
1814 }
1815
1816 /* Try to release the slave device <slave> from the bond device <master>
1817 * It is legal to access curr_active_slave without a lock because all the function
1818 * is RTNL-locked. If "all" is true it means that the function is being called
1819 * while destroying a bond interface and all slaves are being released.
1820 *
1821 * The rules for slave state should be:
1822 * for Active/Backup:
1823 * Active stays on all backups go down
1824 * for Bonded connections:
1825 * The first up interface should be left on and all others downed.
1826 */
1827 static int __bond_release_one(struct net_device *bond_dev,
1828 struct net_device *slave_dev,
1829 bool all, bool unregister)
1830 {
1831 struct bonding *bond = netdev_priv(bond_dev);
1832 struct slave *slave, *oldcurrent;
1833 struct sockaddr_storage ss;
1834 int old_flags = bond_dev->flags;
1835 netdev_features_t old_features = bond_dev->features;
1836
1837 /* slave is not a slave or master is not master of this slave */
1838 if (!(slave_dev->flags & IFF_SLAVE) ||
1839 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1840 netdev_dbg(bond_dev, "cannot release %s\n",
1841 slave_dev->name);
1842 return -EINVAL;
1843 }
1844
1845 block_netpoll_tx();
1846
1847 slave = bond_get_slave_by_dev(bond, slave_dev);
1848 if (!slave) {
1849 /* not a slave of this bond */
1850 netdev_info(bond_dev, "%s not enslaved\n",
1851 slave_dev->name);
1852 unblock_netpoll_tx();
1853 return -EINVAL;
1854 }
1855
1856 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1857
1858 bond_sysfs_slave_del(slave);
1859
1860 /* recompute stats just before removing the slave */
1861 bond_get_stats(bond->dev, &bond->bond_stats);
1862
1863 bond_upper_dev_unlink(bond, slave);
1864 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1865 * for this slave anymore.
1866 */
1867 netdev_rx_handler_unregister(slave_dev);
1868
1869 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1870 bond_3ad_unbind_slave(slave);
1871
1872 if (bond_mode_uses_xmit_hash(bond))
1873 bond_update_slave_arr(bond, slave);
1874
1875 netdev_info(bond_dev, "Releasing %s interface %s\n",
1876 bond_is_active_slave(slave) ? "active" : "backup",
1877 slave_dev->name);
1878
1879 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1880
1881 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1882
1883 if (!all && (!bond->params.fail_over_mac ||
1884 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1885 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1886 bond_has_slaves(bond))
1887 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",
1888 slave_dev->name, slave->perm_hwaddr,
1889 bond_dev->name, slave_dev->name);
1890 }
1891
1892 if (rtnl_dereference(bond->primary_slave) == slave)
1893 RCU_INIT_POINTER(bond->primary_slave, NULL);
1894
1895 if (oldcurrent == slave)
1896 bond_change_active_slave(bond, NULL);
1897
1898 if (bond_is_lb(bond)) {
1899 /* Must be called only after the slave has been
1900 * detached from the list and the curr_active_slave
1901 * has been cleared (if our_slave == old_current),
1902 * but before a new active slave is selected.
1903 */
1904 bond_alb_deinit_slave(bond, slave);
1905 }
1906
1907 if (all) {
1908 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1909 } else if (oldcurrent == slave) {
1910 /* Note that we hold RTNL over this sequence, so there
1911 * is no concern that another slave add/remove event
1912 * will interfere.
1913 */
1914 bond_select_active_slave(bond);
1915 }
1916
1917 if (!bond_has_slaves(bond)) {
1918 bond_set_carrier(bond);
1919 eth_hw_addr_random(bond_dev);
1920 }
1921
1922 unblock_netpoll_tx();
1923 synchronize_rcu();
1924 bond->slave_cnt--;
1925
1926 if (!bond_has_slaves(bond)) {
1927 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1928 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1929 }
1930
1931 bond_compute_features(bond);
1932 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1933 (old_features & NETIF_F_VLAN_CHALLENGED))
1934 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1935 slave_dev->name, bond_dev->name);
1936
1937 vlan_vids_del_by_dev(slave_dev, bond_dev);
1938
1939 /* If the mode uses primary, then this case was handled above by
1940 * bond_change_active_slave(..., NULL)
1941 */
1942 if (!bond_uses_primary(bond)) {
1943 /* unset promiscuity level from slave
1944 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1945 * of the IFF_PROMISC flag in the bond_dev, but we need the
1946 * value of that flag before that change, as that was the value
1947 * when this slave was attached, so we cache at the start of the
1948 * function and use it here. Same goes for ALLMULTI below
1949 */
1950 if (old_flags & IFF_PROMISC)
1951 dev_set_promiscuity(slave_dev, -1);
1952
1953 /* unset allmulti level from slave */
1954 if (old_flags & IFF_ALLMULTI)
1955 dev_set_allmulti(slave_dev, -1);
1956
1957 bond_hw_addr_flush(bond_dev, slave_dev);
1958 }
1959
1960 slave_disable_netpoll(slave);
1961
1962 /* close slave before restoring its mac address */
1963 dev_close(slave_dev);
1964
1965 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1966 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1967 /* restore original ("permanent") mac address */
1968 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
1969 slave->dev->addr_len);
1970 ss.ss_family = slave_dev->type;
1971 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss);
1972 }
1973
1974 if (unregister)
1975 __dev_set_mtu(slave_dev, slave->original_mtu);
1976 else
1977 dev_set_mtu(slave_dev, slave->original_mtu);
1978
1979 slave_dev->priv_flags &= ~IFF_BONDING;
1980
1981 bond_free_slave(slave);
1982
1983 return 0;
1984 }
1985
1986 /* A wrapper used because of ndo_del_link */
1987 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1988 {
1989 return __bond_release_one(bond_dev, slave_dev, false, false);
1990 }
1991
1992 /* First release a slave and then destroy the bond if no more slaves are left.
1993 * Must be under rtnl_lock when this function is called.
1994 */
1995 static int bond_release_and_destroy(struct net_device *bond_dev,
1996 struct net_device *slave_dev)
1997 {
1998 struct bonding *bond = netdev_priv(bond_dev);
1999 int ret;
2000
2001 ret = __bond_release_one(bond_dev, slave_dev, false, true);
2002 if (ret == 0 && !bond_has_slaves(bond)) {
2003 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2004 netdev_info(bond_dev, "Destroying bond %s\n",
2005 bond_dev->name);
2006 bond_remove_proc_entry(bond);
2007 unregister_netdevice(bond_dev);
2008 }
2009 return ret;
2010 }
2011
2012 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2013 {
2014 struct bonding *bond = netdev_priv(bond_dev);
2015 bond_fill_ifbond(bond, info);
2016 }
2017
2018 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2019 {
2020 struct bonding *bond = netdev_priv(bond_dev);
2021 struct list_head *iter;
2022 int i = 0, res = -ENODEV;
2023 struct slave *slave;
2024
2025 bond_for_each_slave(bond, slave, iter) {
2026 if (i++ == (int)info->slave_id) {
2027 res = 0;
2028 bond_fill_ifslave(slave, info);
2029 break;
2030 }
2031 }
2032
2033 return res;
2034 }
2035
2036 /*-------------------------------- Monitoring -------------------------------*/
2037
2038 /* called with rcu_read_lock() */
2039 static int bond_miimon_inspect(struct bonding *bond)
2040 {
2041 int link_state, commit = 0;
2042 struct list_head *iter;
2043 struct slave *slave;
2044 bool ignore_updelay;
2045
2046 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2047
2048 bond_for_each_slave_rcu(bond, slave, iter) {
2049 slave->new_link = BOND_LINK_NOCHANGE;
2050 slave->link_new_state = slave->link;
2051
2052 link_state = bond_check_dev_link(bond, slave->dev, 0);
2053
2054 switch (slave->link) {
2055 case BOND_LINK_UP:
2056 if (link_state)
2057 continue;
2058
2059 bond_propose_link_state(slave, BOND_LINK_FAIL);
2060 commit++;
2061 slave->delay = bond->params.downdelay;
2062 if (slave->delay) {
2063 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2064 (BOND_MODE(bond) ==
2065 BOND_MODE_ACTIVEBACKUP) ?
2066 (bond_is_active_slave(slave) ?
2067 "active " : "backup ") : "",
2068 slave->dev->name,
2069 bond->params.downdelay * bond->params.miimon);
2070 }
2071 /*FALLTHRU*/
2072 case BOND_LINK_FAIL:
2073 if (link_state) {
2074 /* recovered before downdelay expired */
2075 bond_propose_link_state(slave, BOND_LINK_UP);
2076 slave->last_link_up = jiffies;
2077 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2078 (bond->params.downdelay - slave->delay) *
2079 bond->params.miimon,
2080 slave->dev->name);
2081 commit++;
2082 continue;
2083 }
2084
2085 if (slave->delay <= 0) {
2086 slave->new_link = BOND_LINK_DOWN;
2087 commit++;
2088 continue;
2089 }
2090
2091 slave->delay--;
2092 break;
2093
2094 case BOND_LINK_DOWN:
2095 if (!link_state)
2096 continue;
2097
2098 bond_propose_link_state(slave, BOND_LINK_BACK);
2099 commit++;
2100 slave->delay = bond->params.updelay;
2101
2102 if (slave->delay) {
2103 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2104 slave->dev->name,
2105 ignore_updelay ? 0 :
2106 bond->params.updelay *
2107 bond->params.miimon);
2108 }
2109 /*FALLTHRU*/
2110 case BOND_LINK_BACK:
2111 if (!link_state) {
2112 bond_propose_link_state(slave, BOND_LINK_DOWN);
2113 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2114 (bond->params.updelay - slave->delay) *
2115 bond->params.miimon,
2116 slave->dev->name);
2117 commit++;
2118 continue;
2119 }
2120
2121 if (ignore_updelay)
2122 slave->delay = 0;
2123
2124 if (slave->delay <= 0) {
2125 slave->new_link = BOND_LINK_UP;
2126 commit++;
2127 ignore_updelay = false;
2128 continue;
2129 }
2130
2131 slave->delay--;
2132 break;
2133 }
2134 }
2135
2136 return commit;
2137 }
2138
2139 static void bond_miimon_commit(struct bonding *bond)
2140 {
2141 struct list_head *iter;
2142 struct slave *slave, *primary;
2143
2144 bond_for_each_slave(bond, slave, iter) {
2145 switch (slave->new_link) {
2146 case BOND_LINK_NOCHANGE:
2147 continue;
2148
2149 case BOND_LINK_UP:
2150 if (bond_update_speed_duplex(slave) &&
2151 bond_needs_speed_duplex(bond)) {
2152 slave->link = BOND_LINK_DOWN;
2153 if (net_ratelimit())
2154 netdev_warn(bond->dev,
2155 "failed to get link speed/duplex for %s\n",
2156 slave->dev->name);
2157 continue;
2158 }
2159 bond_set_slave_link_state(slave, BOND_LINK_UP,
2160 BOND_SLAVE_NOTIFY_NOW);
2161 slave->last_link_up = jiffies;
2162
2163 primary = rtnl_dereference(bond->primary_slave);
2164 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2165 /* prevent it from being the active one */
2166 bond_set_backup_slave(slave);
2167 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2168 /* make it immediately active */
2169 bond_set_active_slave(slave);
2170 } else if (slave != primary) {
2171 /* prevent it from being the active one */
2172 bond_set_backup_slave(slave);
2173 }
2174
2175 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2176 slave->dev->name,
2177 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2178 slave->duplex ? "full" : "half");
2179
2180 /* notify ad that the link status has changed */
2181 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2182 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2183
2184 if (bond_is_lb(bond))
2185 bond_alb_handle_link_change(bond, slave,
2186 BOND_LINK_UP);
2187
2188 if (BOND_MODE(bond) == BOND_MODE_XOR)
2189 bond_update_slave_arr(bond, NULL);
2190
2191 if (!bond->curr_active_slave || slave == primary)
2192 goto do_failover;
2193
2194 continue;
2195
2196 case BOND_LINK_DOWN:
2197 if (slave->link_failure_count < UINT_MAX)
2198 slave->link_failure_count++;
2199
2200 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2201 BOND_SLAVE_NOTIFY_NOW);
2202
2203 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2204 BOND_MODE(bond) == BOND_MODE_8023AD)
2205 bond_set_slave_inactive_flags(slave,
2206 BOND_SLAVE_NOTIFY_NOW);
2207
2208 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2209 slave->dev->name);
2210
2211 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2212 bond_3ad_handle_link_change(slave,
2213 BOND_LINK_DOWN);
2214
2215 if (bond_is_lb(bond))
2216 bond_alb_handle_link_change(bond, slave,
2217 BOND_LINK_DOWN);
2218
2219 if (BOND_MODE(bond) == BOND_MODE_XOR)
2220 bond_update_slave_arr(bond, NULL);
2221
2222 if (slave == rcu_access_pointer(bond->curr_active_slave))
2223 goto do_failover;
2224
2225 continue;
2226
2227 default:
2228 netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2229 slave->new_link, slave->dev->name);
2230 slave->new_link = BOND_LINK_NOCHANGE;
2231
2232 continue;
2233 }
2234
2235 do_failover:
2236 block_netpoll_tx();
2237 bond_select_active_slave(bond);
2238 unblock_netpoll_tx();
2239 }
2240
2241 bond_set_carrier(bond);
2242 }
2243
2244 /* bond_mii_monitor
2245 *
2246 * Really a wrapper that splits the mii monitor into two phases: an
2247 * inspection, then (if inspection indicates something needs to be done)
2248 * an acquisition of appropriate locks followed by a commit phase to
2249 * implement whatever link state changes are indicated.
2250 */
2251 static void bond_mii_monitor(struct work_struct *work)
2252 {
2253 struct bonding *bond = container_of(work, struct bonding,
2254 mii_work.work);
2255 bool should_notify_peers = false;
2256 unsigned long delay;
2257 struct slave *slave;
2258 struct list_head *iter;
2259
2260 delay = msecs_to_jiffies(bond->params.miimon);
2261
2262 if (!bond_has_slaves(bond))
2263 goto re_arm;
2264
2265 rcu_read_lock();
2266
2267 should_notify_peers = bond_should_notify_peers(bond);
2268
2269 if (bond_miimon_inspect(bond)) {
2270 rcu_read_unlock();
2271
2272 /* Race avoidance with bond_close cancel of workqueue */
2273 if (!rtnl_trylock()) {
2274 delay = 1;
2275 should_notify_peers = false;
2276 goto re_arm;
2277 }
2278
2279 bond_for_each_slave(bond, slave, iter) {
2280 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2281 }
2282 bond_miimon_commit(bond);
2283
2284 rtnl_unlock(); /* might sleep, hold no other locks */
2285 } else
2286 rcu_read_unlock();
2287
2288 re_arm:
2289 if (bond->params.miimon)
2290 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2291
2292 if (should_notify_peers) {
2293 if (!rtnl_trylock())
2294 return;
2295 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2296 rtnl_unlock();
2297 }
2298 }
2299
2300 static int bond_upper_dev_walk(struct net_device *upper, void *data)
2301 {
2302 __be32 ip = *((__be32 *)data);
2303
2304 return ip == bond_confirm_addr(upper, 0, ip);
2305 }
2306
2307 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2308 {
2309 bool ret = false;
2310
2311 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2312 return true;
2313
2314 rcu_read_lock();
2315 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip))
2316 ret = true;
2317 rcu_read_unlock();
2318
2319 return ret;
2320 }
2321
2322 /* We go to the (large) trouble of VLAN tagging ARP frames because
2323 * switches in VLAN mode (especially if ports are configured as
2324 * "native" to a VLAN) might not pass non-tagged frames.
2325 */
2326 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2327 __be32 dest_ip, __be32 src_ip,
2328 struct bond_vlan_tag *tags)
2329 {
2330 struct sk_buff *skb;
2331 struct bond_vlan_tag *outer_tag = tags;
2332
2333 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2334 arp_op, slave_dev->name, &dest_ip, &src_ip);
2335
2336 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2337 NULL, slave_dev->dev_addr, NULL);
2338
2339 if (!skb) {
2340 net_err_ratelimited("ARP packet allocation failed\n");
2341 return;
2342 }
2343
2344 if (!tags || tags->vlan_proto == VLAN_N_VID)
2345 goto xmit;
2346
2347 tags++;
2348
2349 /* Go through all the tags backwards and add them to the packet */
2350 while (tags->vlan_proto != VLAN_N_VID) {
2351 if (!tags->vlan_id) {
2352 tags++;
2353 continue;
2354 }
2355
2356 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2357 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2358 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2359 tags->vlan_id);
2360 if (!skb) {
2361 net_err_ratelimited("failed to insert inner VLAN tag\n");
2362 return;
2363 }
2364
2365 tags++;
2366 }
2367 /* Set the outer tag */
2368 if (outer_tag->vlan_id) {
2369 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2370 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2371 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2372 outer_tag->vlan_id);
2373 }
2374
2375 xmit:
2376 arp_xmit(skb);
2377 }
2378
2379 /* Validate the device path between the @start_dev and the @end_dev.
2380 * The path is valid if the @end_dev is reachable through device
2381 * stacking.
2382 * When the path is validated, collect any vlan information in the
2383 * path.
2384 */
2385 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2386 struct net_device *end_dev,
2387 int level)
2388 {
2389 struct bond_vlan_tag *tags;
2390 struct net_device *upper;
2391 struct list_head *iter;
2392
2393 if (start_dev == end_dev) {
2394 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2395 if (!tags)
2396 return ERR_PTR(-ENOMEM);
2397 tags[level].vlan_proto = VLAN_N_VID;
2398 return tags;
2399 }
2400
2401 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2402 tags = bond_verify_device_path(upper, end_dev, level + 1);
2403 if (IS_ERR_OR_NULL(tags)) {
2404 if (IS_ERR(tags))
2405 return tags;
2406 continue;
2407 }
2408 if (is_vlan_dev(upper)) {
2409 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2410 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2411 }
2412
2413 return tags;
2414 }
2415
2416 return NULL;
2417 }
2418
2419 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2420 {
2421 struct rtable *rt;
2422 struct bond_vlan_tag *tags;
2423 __be32 *targets = bond->params.arp_targets, addr;
2424 int i;
2425
2426 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2427 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2428 tags = NULL;
2429
2430 /* Find out through which dev should the packet go */
2431 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2432 RTO_ONLINK, 0);
2433 if (IS_ERR(rt)) {
2434 /* there's no route to target - try to send arp
2435 * probe to generate any traffic (arp_validate=0)
2436 */
2437 if (bond->params.arp_validate)
2438 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2439 bond->dev->name,
2440 &targets[i]);
2441 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2442 0, tags);
2443 continue;
2444 }
2445
2446 /* bond device itself */
2447 if (rt->dst.dev == bond->dev)
2448 goto found;
2449
2450 rcu_read_lock();
2451 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2452 rcu_read_unlock();
2453
2454 if (!IS_ERR_OR_NULL(tags))
2455 goto found;
2456
2457 /* Not our device - skip */
2458 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2459 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2460
2461 ip_rt_put(rt);
2462 continue;
2463
2464 found:
2465 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2466 ip_rt_put(rt);
2467 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2468 addr, tags);
2469 kfree(tags);
2470 }
2471 }
2472
2473 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2474 {
2475 int i;
2476
2477 if (!sip || !bond_has_this_ip(bond, tip)) {
2478 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2479 &sip, &tip);
2480 return;
2481 }
2482
2483 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2484 if (i == -1) {
2485 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2486 &sip);
2487 return;
2488 }
2489 slave->last_rx = jiffies;
2490 slave->target_last_arp_rx[i] = jiffies;
2491 }
2492
2493 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2494 struct slave *slave)
2495 {
2496 struct arphdr *arp = (struct arphdr *)skb->data;
2497 struct slave *curr_active_slave, *curr_arp_slave;
2498 unsigned char *arp_ptr;
2499 __be32 sip, tip;
2500 int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2501 unsigned int alen;
2502
2503 if (!slave_do_arp_validate(bond, slave)) {
2504 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2505 !slave_do_arp_validate_only(bond))
2506 slave->last_rx = jiffies;
2507 return RX_HANDLER_ANOTHER;
2508 } else if (!is_arp) {
2509 return RX_HANDLER_ANOTHER;
2510 }
2511
2512 alen = arp_hdr_len(bond->dev);
2513
2514 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2515 skb->dev->name);
2516
2517 if (alen > skb_headlen(skb)) {
2518 arp = kmalloc(alen, GFP_ATOMIC);
2519 if (!arp)
2520 goto out_unlock;
2521 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2522 goto out_unlock;
2523 }
2524
2525 if (arp->ar_hln != bond->dev->addr_len ||
2526 skb->pkt_type == PACKET_OTHERHOST ||
2527 skb->pkt_type == PACKET_LOOPBACK ||
2528 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2529 arp->ar_pro != htons(ETH_P_IP) ||
2530 arp->ar_pln != 4)
2531 goto out_unlock;
2532
2533 arp_ptr = (unsigned char *)(arp + 1);
2534 arp_ptr += bond->dev->addr_len;
2535 memcpy(&sip, arp_ptr, 4);
2536 arp_ptr += 4 + bond->dev->addr_len;
2537 memcpy(&tip, arp_ptr, 4);
2538
2539 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2540 slave->dev->name, bond_slave_state(slave),
2541 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2542 &sip, &tip);
2543
2544 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2545 curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2546
2547 /* We 'trust' the received ARP enough to validate it if:
2548 *
2549 * (a) the slave receiving the ARP is active (which includes the
2550 * current ARP slave, if any), or
2551 *
2552 * (b) the receiving slave isn't active, but there is a currently
2553 * active slave and it received valid arp reply(s) after it became
2554 * the currently active slave, or
2555 *
2556 * (c) there is an ARP slave that sent an ARP during the prior ARP
2557 * interval, and we receive an ARP reply on any slave. We accept
2558 * these because switch FDB update delays may deliver the ARP
2559 * reply to a slave other than the sender of the ARP request.
2560 *
2561 * Note: for (b), backup slaves are receiving the broadcast ARP
2562 * request, not a reply. This request passes from the sending
2563 * slave through the L2 switch(es) to the receiving slave. Since
2564 * this is checking the request, sip/tip are swapped for
2565 * validation.
2566 *
2567 * This is done to avoid endless looping when we can't reach the
2568 * arp_ip_target and fool ourselves with our own arp requests.
2569 */
2570 if (bond_is_active_slave(slave))
2571 bond_validate_arp(bond, slave, sip, tip);
2572 else if (curr_active_slave &&
2573 time_after(slave_last_rx(bond, curr_active_slave),
2574 curr_active_slave->last_link_up))
2575 bond_validate_arp(bond, slave, tip, sip);
2576 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2577 bond_time_in_interval(bond,
2578 dev_trans_start(curr_arp_slave->dev), 1))
2579 bond_validate_arp(bond, slave, sip, tip);
2580
2581 out_unlock:
2582 if (arp != (struct arphdr *)skb->data)
2583 kfree(arp);
2584 return RX_HANDLER_ANOTHER;
2585 }
2586
2587 /* function to verify if we're in the arp_interval timeslice, returns true if
2588 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2589 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2590 */
2591 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2592 int mod)
2593 {
2594 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2595
2596 return time_in_range(jiffies,
2597 last_act - delta_in_ticks,
2598 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2599 }
2600
2601 /* This function is called regularly to monitor each slave's link
2602 * ensuring that traffic is being sent and received when arp monitoring
2603 * is used in load-balancing mode. if the adapter has been dormant, then an
2604 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2605 * arp monitoring in active backup mode.
2606 */
2607 static void bond_loadbalance_arp_mon(struct bonding *bond)
2608 {
2609 struct slave *slave, *oldcurrent;
2610 struct list_head *iter;
2611 int do_failover = 0, slave_state_changed = 0;
2612
2613 if (!bond_has_slaves(bond))
2614 goto re_arm;
2615
2616 rcu_read_lock();
2617
2618 oldcurrent = rcu_dereference(bond->curr_active_slave);
2619 /* see if any of the previous devices are up now (i.e. they have
2620 * xmt and rcv traffic). the curr_active_slave does not come into
2621 * the picture unless it is null. also, slave->last_link_up is not
2622 * needed here because we send an arp on each slave and give a slave
2623 * as long as it needs to get the tx/rx within the delta.
2624 * TODO: what about up/down delay in arp mode? it wasn't here before
2625 * so it can wait
2626 */
2627 bond_for_each_slave_rcu(bond, slave, iter) {
2628 unsigned long trans_start = dev_trans_start(slave->dev);
2629
2630 slave->new_link = BOND_LINK_NOCHANGE;
2631
2632 if (slave->link != BOND_LINK_UP) {
2633 if (bond_time_in_interval(bond, trans_start, 1) &&
2634 bond_time_in_interval(bond, slave->last_rx, 1)) {
2635
2636 slave->new_link = BOND_LINK_UP;
2637 slave_state_changed = 1;
2638
2639 /* primary_slave has no meaning in round-robin
2640 * mode. the window of a slave being up and
2641 * curr_active_slave being null after enslaving
2642 * is closed.
2643 */
2644 if (!oldcurrent) {
2645 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2646 slave->dev->name);
2647 do_failover = 1;
2648 } else {
2649 netdev_info(bond->dev, "interface %s is now up\n",
2650 slave->dev->name);
2651 }
2652 }
2653 } else {
2654 /* slave->link == BOND_LINK_UP */
2655
2656 /* not all switches will respond to an arp request
2657 * when the source ip is 0, so don't take the link down
2658 * if we don't know our ip yet
2659 */
2660 if (!bond_time_in_interval(bond, trans_start, 2) ||
2661 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2662
2663 slave->new_link = BOND_LINK_DOWN;
2664 slave_state_changed = 1;
2665
2666 if (slave->link_failure_count < UINT_MAX)
2667 slave->link_failure_count++;
2668
2669 netdev_info(bond->dev, "interface %s is now down\n",
2670 slave->dev->name);
2671
2672 if (slave == oldcurrent)
2673 do_failover = 1;
2674 }
2675 }
2676
2677 /* note: if switch is in round-robin mode, all links
2678 * must tx arp to ensure all links rx an arp - otherwise
2679 * links may oscillate or not come up at all; if switch is
2680 * in something like xor mode, there is nothing we can
2681 * do - all replies will be rx'ed on same link causing slaves
2682 * to be unstable during low/no traffic periods
2683 */
2684 if (bond_slave_is_up(slave))
2685 bond_arp_send_all(bond, slave);
2686 }
2687
2688 rcu_read_unlock();
2689
2690 if (do_failover || slave_state_changed) {
2691 if (!rtnl_trylock())
2692 goto re_arm;
2693
2694 bond_for_each_slave(bond, slave, iter) {
2695 if (slave->new_link != BOND_LINK_NOCHANGE)
2696 slave->link = slave->new_link;
2697 }
2698
2699 if (slave_state_changed) {
2700 bond_slave_state_change(bond);
2701 if (BOND_MODE(bond) == BOND_MODE_XOR)
2702 bond_update_slave_arr(bond, NULL);
2703 }
2704 if (do_failover) {
2705 block_netpoll_tx();
2706 bond_select_active_slave(bond);
2707 unblock_netpoll_tx();
2708 }
2709 rtnl_unlock();
2710 }
2711
2712 re_arm:
2713 if (bond->params.arp_interval)
2714 queue_delayed_work(bond->wq, &bond->arp_work,
2715 msecs_to_jiffies(bond->params.arp_interval));
2716 }
2717
2718 /* Called to inspect slaves for active-backup mode ARP monitor link state
2719 * changes. Sets new_link in slaves to specify what action should take
2720 * place for the slave. Returns 0 if no changes are found, >0 if changes
2721 * to link states must be committed.
2722 *
2723 * Called with rcu_read_lock held.
2724 */
2725 static int bond_ab_arp_inspect(struct bonding *bond)
2726 {
2727 unsigned long trans_start, last_rx;
2728 struct list_head *iter;
2729 struct slave *slave;
2730 int commit = 0;
2731
2732 bond_for_each_slave_rcu(bond, slave, iter) {
2733 slave->new_link = BOND_LINK_NOCHANGE;
2734 last_rx = slave_last_rx(bond, slave);
2735
2736 if (slave->link != BOND_LINK_UP) {
2737 if (bond_time_in_interval(bond, last_rx, 1)) {
2738 slave->new_link = BOND_LINK_UP;
2739 commit++;
2740 }
2741 continue;
2742 }
2743
2744 /* Give slaves 2*delta after being enslaved or made
2745 * active. This avoids bouncing, as the last receive
2746 * times need a full ARP monitor cycle to be updated.
2747 */
2748 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2749 continue;
2750
2751 /* Backup slave is down if:
2752 * - No current_arp_slave AND
2753 * - more than 3*delta since last receive AND
2754 * - the bond has an IP address
2755 *
2756 * Note: a non-null current_arp_slave indicates
2757 * the curr_active_slave went down and we are
2758 * searching for a new one; under this condition
2759 * we only take the curr_active_slave down - this
2760 * gives each slave a chance to tx/rx traffic
2761 * before being taken out
2762 */
2763 if (!bond_is_active_slave(slave) &&
2764 !rcu_access_pointer(bond->current_arp_slave) &&
2765 !bond_time_in_interval(bond, last_rx, 3)) {
2766 slave->new_link = BOND_LINK_DOWN;
2767 commit++;
2768 }
2769
2770 /* Active slave is down if:
2771 * - more than 2*delta since transmitting OR
2772 * - (more than 2*delta since receive AND
2773 * the bond has an IP address)
2774 */
2775 trans_start = dev_trans_start(slave->dev);
2776 if (bond_is_active_slave(slave) &&
2777 (!bond_time_in_interval(bond, trans_start, 2) ||
2778 !bond_time_in_interval(bond, last_rx, 2))) {
2779 slave->new_link = BOND_LINK_DOWN;
2780 commit++;
2781 }
2782 }
2783
2784 return commit;
2785 }
2786
2787 /* Called to commit link state changes noted by inspection step of
2788 * active-backup mode ARP monitor.
2789 *
2790 * Called with RTNL hold.
2791 */
2792 static void bond_ab_arp_commit(struct bonding *bond)
2793 {
2794 unsigned long trans_start;
2795 struct list_head *iter;
2796 struct slave *slave;
2797
2798 bond_for_each_slave(bond, slave, iter) {
2799 switch (slave->new_link) {
2800 case BOND_LINK_NOCHANGE:
2801 continue;
2802
2803 case BOND_LINK_UP:
2804 trans_start = dev_trans_start(slave->dev);
2805 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2806 (!rtnl_dereference(bond->curr_active_slave) &&
2807 bond_time_in_interval(bond, trans_start, 1))) {
2808 struct slave *current_arp_slave;
2809
2810 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2811 bond_set_slave_link_state(slave, BOND_LINK_UP,
2812 BOND_SLAVE_NOTIFY_NOW);
2813 if (current_arp_slave) {
2814 bond_set_slave_inactive_flags(
2815 current_arp_slave,
2816 BOND_SLAVE_NOTIFY_NOW);
2817 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2818 }
2819
2820 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2821 slave->dev->name);
2822
2823 if (!rtnl_dereference(bond->curr_active_slave) ||
2824 slave == rtnl_dereference(bond->primary_slave))
2825 goto do_failover;
2826
2827 }
2828
2829 continue;
2830
2831 case BOND_LINK_DOWN:
2832 if (slave->link_failure_count < UINT_MAX)
2833 slave->link_failure_count++;
2834
2835 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2836 BOND_SLAVE_NOTIFY_NOW);
2837 bond_set_slave_inactive_flags(slave,
2838 BOND_SLAVE_NOTIFY_NOW);
2839
2840 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2841 slave->dev->name);
2842
2843 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2844 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2845 goto do_failover;
2846 }
2847
2848 continue;
2849
2850 default:
2851 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2852 slave->new_link, slave->dev->name);
2853 continue;
2854 }
2855
2856 do_failover:
2857 block_netpoll_tx();
2858 bond_select_active_slave(bond);
2859 unblock_netpoll_tx();
2860 }
2861
2862 bond_set_carrier(bond);
2863 }
2864
2865 /* Send ARP probes for active-backup mode ARP monitor.
2866 *
2867 * Called with rcu_read_lock held.
2868 */
2869 static bool bond_ab_arp_probe(struct bonding *bond)
2870 {
2871 struct slave *slave, *before = NULL, *new_slave = NULL,
2872 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2873 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2874 struct list_head *iter;
2875 bool found = false;
2876 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2877
2878 if (curr_arp_slave && curr_active_slave)
2879 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2880 curr_arp_slave->dev->name,
2881 curr_active_slave->dev->name);
2882
2883 if (curr_active_slave) {
2884 bond_arp_send_all(bond, curr_active_slave);
2885 return should_notify_rtnl;
2886 }
2887
2888 /* if we don't have a curr_active_slave, search for the next available
2889 * backup slave from the current_arp_slave and make it the candidate
2890 * for becoming the curr_active_slave
2891 */
2892
2893 if (!curr_arp_slave) {
2894 curr_arp_slave = bond_first_slave_rcu(bond);
2895 if (!curr_arp_slave)
2896 return should_notify_rtnl;
2897 }
2898
2899 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2900
2901 bond_for_each_slave_rcu(bond, slave, iter) {
2902 if (!found && !before && bond_slave_is_up(slave))
2903 before = slave;
2904
2905 if (found && !new_slave && bond_slave_is_up(slave))
2906 new_slave = slave;
2907 /* if the link state is up at this point, we
2908 * mark it down - this can happen if we have
2909 * simultaneous link failures and
2910 * reselect_active_interface doesn't make this
2911 * one the current slave so it is still marked
2912 * up when it is actually down
2913 */
2914 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2915 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2916 BOND_SLAVE_NOTIFY_LATER);
2917 if (slave->link_failure_count < UINT_MAX)
2918 slave->link_failure_count++;
2919
2920 bond_set_slave_inactive_flags(slave,
2921 BOND_SLAVE_NOTIFY_LATER);
2922
2923 netdev_info(bond->dev, "backup interface %s is now down\n",
2924 slave->dev->name);
2925 }
2926 if (slave == curr_arp_slave)
2927 found = true;
2928 }
2929
2930 if (!new_slave && before)
2931 new_slave = before;
2932
2933 if (!new_slave)
2934 goto check_state;
2935
2936 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2937 BOND_SLAVE_NOTIFY_LATER);
2938 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2939 bond_arp_send_all(bond, new_slave);
2940 new_slave->last_link_up = jiffies;
2941 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2942
2943 check_state:
2944 bond_for_each_slave_rcu(bond, slave, iter) {
2945 if (slave->should_notify || slave->should_notify_link) {
2946 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2947 break;
2948 }
2949 }
2950 return should_notify_rtnl;
2951 }
2952
2953 static void bond_activebackup_arp_mon(struct bonding *bond)
2954 {
2955 bool should_notify_peers = false;
2956 bool should_notify_rtnl = false;
2957 int delta_in_ticks;
2958
2959 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2960
2961 if (!bond_has_slaves(bond))
2962 goto re_arm;
2963
2964 rcu_read_lock();
2965
2966 should_notify_peers = bond_should_notify_peers(bond);
2967
2968 if (bond_ab_arp_inspect(bond)) {
2969 rcu_read_unlock();
2970
2971 /* Race avoidance with bond_close flush of workqueue */
2972 if (!rtnl_trylock()) {
2973 delta_in_ticks = 1;
2974 should_notify_peers = false;
2975 goto re_arm;
2976 }
2977
2978 bond_ab_arp_commit(bond);
2979
2980 rtnl_unlock();
2981 rcu_read_lock();
2982 }
2983
2984 should_notify_rtnl = bond_ab_arp_probe(bond);
2985 rcu_read_unlock();
2986
2987 re_arm:
2988 if (bond->params.arp_interval)
2989 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2990
2991 if (should_notify_peers || should_notify_rtnl) {
2992 if (!rtnl_trylock())
2993 return;
2994
2995 if (should_notify_peers)
2996 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2997 bond->dev);
2998 if (should_notify_rtnl) {
2999 bond_slave_state_notify(bond);
3000 bond_slave_link_notify(bond);
3001 }
3002
3003 rtnl_unlock();
3004 }
3005 }
3006
3007 static void bond_arp_monitor(struct work_struct *work)
3008 {
3009 struct bonding *bond = container_of(work, struct bonding,
3010 arp_work.work);
3011
3012 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3013 bond_activebackup_arp_mon(bond);
3014 else
3015 bond_loadbalance_arp_mon(bond);
3016 }
3017
3018 /*-------------------------- netdev event handling --------------------------*/
3019
3020 /* Change device name */
3021 static int bond_event_changename(struct bonding *bond)
3022 {
3023 bond_remove_proc_entry(bond);
3024 bond_create_proc_entry(bond);
3025
3026 bond_debug_reregister(bond);
3027
3028 return NOTIFY_DONE;
3029 }
3030
3031 static int bond_master_netdev_event(unsigned long event,
3032 struct net_device *bond_dev)
3033 {
3034 struct bonding *event_bond = netdev_priv(bond_dev);
3035
3036 switch (event) {
3037 case NETDEV_CHANGENAME:
3038 return bond_event_changename(event_bond);
3039 case NETDEV_UNREGISTER:
3040 bond_remove_proc_entry(event_bond);
3041 break;
3042 case NETDEV_REGISTER:
3043 bond_create_proc_entry(event_bond);
3044 break;
3045 case NETDEV_NOTIFY_PEERS:
3046 if (event_bond->send_peer_notif)
3047 event_bond->send_peer_notif--;
3048 break;
3049 default:
3050 break;
3051 }
3052
3053 return NOTIFY_DONE;
3054 }
3055
3056 static int bond_slave_netdev_event(unsigned long event,
3057 struct net_device *slave_dev)
3058 {
3059 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3060 struct bonding *bond;
3061 struct net_device *bond_dev;
3062
3063 /* A netdev event can be generated while enslaving a device
3064 * before netdev_rx_handler_register is called in which case
3065 * slave will be NULL
3066 */
3067 if (!slave)
3068 return NOTIFY_DONE;
3069 bond_dev = slave->bond->dev;
3070 bond = slave->bond;
3071 primary = rtnl_dereference(bond->primary_slave);
3072
3073 switch (event) {
3074 case NETDEV_UNREGISTER:
3075 if (bond_dev->type != ARPHRD_ETHER)
3076 bond_release_and_destroy(bond_dev, slave_dev);
3077 else
3078 __bond_release_one(bond_dev, slave_dev, false, true);
3079 break;
3080 case NETDEV_UP:
3081 case NETDEV_CHANGE:
3082 /* For 802.3ad mode only:
3083 * Getting invalid Speed/Duplex values here will put slave
3084 * in weird state. So mark it as link-down for the time
3085 * being and let link-monitoring (miimon) set it right when
3086 * correct speeds/duplex are available.
3087 */
3088 if (bond_update_speed_duplex(slave) &&
3089 BOND_MODE(bond) == BOND_MODE_8023AD)
3090 slave->link = BOND_LINK_DOWN;
3091
3092 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3093 bond_3ad_adapter_speed_duplex_changed(slave);
3094 /* Fallthrough */
3095 case NETDEV_DOWN:
3096 /* Refresh slave-array if applicable!
3097 * If the setup does not use miimon or arpmon (mode-specific!),
3098 * then these events will not cause the slave-array to be
3099 * refreshed. This will cause xmit to use a slave that is not
3100 * usable. Avoid such situation by refeshing the array at these
3101 * events. If these (miimon/arpmon) parameters are configured
3102 * then array gets refreshed twice and that should be fine!
3103 */
3104 if (bond_mode_uses_xmit_hash(bond))
3105 bond_update_slave_arr(bond, NULL);
3106 break;
3107 case NETDEV_CHANGEMTU:
3108 /* TODO: Should slaves be allowed to
3109 * independently alter their MTU? For
3110 * an active-backup bond, slaves need
3111 * not be the same type of device, so
3112 * MTUs may vary. For other modes,
3113 * slaves arguably should have the
3114 * same MTUs. To do this, we'd need to
3115 * take over the slave's change_mtu
3116 * function for the duration of their
3117 * servitude.
3118 */
3119 break;
3120 case NETDEV_CHANGENAME:
3121 /* we don't care if we don't have primary set */
3122 if (!bond_uses_primary(bond) ||
3123 !bond->params.primary[0])
3124 break;
3125
3126 if (slave == primary) {
3127 /* slave's name changed - he's no longer primary */
3128 RCU_INIT_POINTER(bond->primary_slave, NULL);
3129 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3130 /* we have a new primary slave */
3131 rcu_assign_pointer(bond->primary_slave, slave);
3132 } else { /* we didn't change primary - exit */
3133 break;
3134 }
3135
3136 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3137 primary ? slave_dev->name : "none");
3138
3139 block_netpoll_tx();
3140 bond_select_active_slave(bond);
3141 unblock_netpoll_tx();
3142 break;
3143 case NETDEV_FEAT_CHANGE:
3144 bond_compute_features(bond);
3145 break;
3146 case NETDEV_RESEND_IGMP:
3147 /* Propagate to master device */
3148 call_netdevice_notifiers(event, slave->bond->dev);
3149 break;
3150 default:
3151 break;
3152 }
3153
3154 return NOTIFY_DONE;
3155 }
3156
3157 /* bond_netdev_event: handle netdev notifier chain events.
3158 *
3159 * This function receives events for the netdev chain. The caller (an
3160 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3161 * locks for us to safely manipulate the slave devices (RTNL lock,
3162 * dev_probe_lock).
3163 */
3164 static int bond_netdev_event(struct notifier_block *this,
3165 unsigned long event, void *ptr)
3166 {
3167 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3168
3169 netdev_dbg(event_dev, "event: %lx\n", event);
3170
3171 if (!(event_dev->priv_flags & IFF_BONDING))
3172 return NOTIFY_DONE;
3173
3174 if (event_dev->flags & IFF_MASTER) {
3175 netdev_dbg(event_dev, "IFF_MASTER\n");
3176 return bond_master_netdev_event(event, event_dev);
3177 }
3178
3179 if (event_dev->flags & IFF_SLAVE) {
3180 netdev_dbg(event_dev, "IFF_SLAVE\n");
3181 return bond_slave_netdev_event(event, event_dev);
3182 }
3183
3184 return NOTIFY_DONE;
3185 }
3186
3187 static struct notifier_block bond_netdev_notifier = {
3188 .notifier_call = bond_netdev_event,
3189 };
3190
3191 /*---------------------------- Hashing Policies -----------------------------*/
3192
3193 /* L2 hash helper */
3194 static inline u32 bond_eth_hash(struct sk_buff *skb)
3195 {
3196 struct ethhdr *ep, hdr_tmp;
3197
3198 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3199 if (ep)
3200 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3201 return 0;
3202 }
3203
3204 /* Extract the appropriate headers based on bond's xmit policy */
3205 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3206 struct flow_keys *fk)
3207 {
3208 const struct ipv6hdr *iph6;
3209 const struct iphdr *iph;
3210 int noff, proto = -1;
3211
3212 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3213 return skb_flow_dissect_flow_keys(skb, fk, 0);
3214
3215 fk->ports.ports = 0;
3216 noff = skb_network_offset(skb);
3217 if (skb->protocol == htons(ETH_P_IP)) {
3218 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3219 return false;
3220 iph = ip_hdr(skb);
3221 iph_to_flow_copy_v4addrs(fk, iph);
3222 noff += iph->ihl << 2;
3223 if (!ip_is_fragment(iph))
3224 proto = iph->protocol;
3225 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3226 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3227 return false;
3228 iph6 = ipv6_hdr(skb);
3229 iph_to_flow_copy_v6addrs(fk, iph6);
3230 noff += sizeof(*iph6);
3231 proto = iph6->nexthdr;
3232 } else {
3233 return false;
3234 }
3235 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3236 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3237
3238 return true;
3239 }
3240
3241 /**
3242 * bond_xmit_hash - generate a hash value based on the xmit policy
3243 * @bond: bonding device
3244 * @skb: buffer to use for headers
3245 *
3246 * This function will extract the necessary headers from the skb buffer and use
3247 * them to generate a hash based on the xmit_policy set in the bonding device
3248 */
3249 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3250 {
3251 struct flow_keys flow;
3252 u32 hash;
3253
3254 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3255 skb->l4_hash)
3256 return skb->hash;
3257
3258 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3259 !bond_flow_dissect(bond, skb, &flow))
3260 return bond_eth_hash(skb);
3261
3262 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3263 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3264 hash = bond_eth_hash(skb);
3265 else
3266 hash = (__force u32)flow.ports.ports;
3267 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3268 (__force u32)flow_get_u32_src(&flow);
3269 hash ^= (hash >> 16);
3270 hash ^= (hash >> 8);
3271
3272 return hash >> 1;
3273 }
3274
3275 /*-------------------------- Device entry points ----------------------------*/
3276
3277 void bond_work_init_all(struct bonding *bond)
3278 {
3279 INIT_DELAYED_WORK(&bond->mcast_work,
3280 bond_resend_igmp_join_requests_delayed);
3281 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3282 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3283 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3284 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3285 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3286 }
3287
3288 static void bond_work_cancel_all(struct bonding *bond)
3289 {
3290 cancel_delayed_work_sync(&bond->mii_work);
3291 cancel_delayed_work_sync(&bond->arp_work);
3292 cancel_delayed_work_sync(&bond->alb_work);
3293 cancel_delayed_work_sync(&bond->ad_work);
3294 cancel_delayed_work_sync(&bond->mcast_work);
3295 cancel_delayed_work_sync(&bond->slave_arr_work);
3296 }
3297
3298 static int bond_open(struct net_device *bond_dev)
3299 {
3300 struct bonding *bond = netdev_priv(bond_dev);
3301 struct list_head *iter;
3302 struct slave *slave;
3303
3304 /* reset slave->backup and slave->inactive */
3305 if (bond_has_slaves(bond)) {
3306 bond_for_each_slave(bond, slave, iter) {
3307 if (bond_uses_primary(bond) &&
3308 slave != rcu_access_pointer(bond->curr_active_slave)) {
3309 bond_set_slave_inactive_flags(slave,
3310 BOND_SLAVE_NOTIFY_NOW);
3311 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3312 bond_set_slave_active_flags(slave,
3313 BOND_SLAVE_NOTIFY_NOW);
3314 }
3315 }
3316 }
3317
3318 if (bond_is_lb(bond)) {
3319 /* bond_alb_initialize must be called before the timer
3320 * is started.
3321 */
3322 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3323 return -ENOMEM;
3324 if (bond->params.tlb_dynamic_lb)
3325 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3326 }
3327
3328 if (bond->params.miimon) /* link check interval, in milliseconds. */
3329 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3330
3331 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3332 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3333 bond->recv_probe = bond_arp_rcv;
3334 }
3335
3336 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3337 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3338 /* register to receive LACPDUs */
3339 bond->recv_probe = bond_3ad_lacpdu_recv;
3340 bond_3ad_initiate_agg_selection(bond, 1);
3341 }
3342
3343 if (bond_mode_uses_xmit_hash(bond))
3344 bond_update_slave_arr(bond, NULL);
3345
3346 return 0;
3347 }
3348
3349 static int bond_close(struct net_device *bond_dev)
3350 {
3351 struct bonding *bond = netdev_priv(bond_dev);
3352
3353 bond_work_cancel_all(bond);
3354 bond->send_peer_notif = 0;
3355 if (bond_is_lb(bond))
3356 bond_alb_deinitialize(bond);
3357 bond->recv_probe = NULL;
3358
3359 return 0;
3360 }
3361
3362 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3363 * that some drivers can provide 32bit values only.
3364 */
3365 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3366 const struct rtnl_link_stats64 *_new,
3367 const struct rtnl_link_stats64 *_old)
3368 {
3369 const u64 *new = (const u64 *)_new;
3370 const u64 *old = (const u64 *)_old;
3371 u64 *res = (u64 *)_res;
3372 int i;
3373
3374 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3375 u64 nv = new[i];
3376 u64 ov = old[i];
3377 s64 delta = nv - ov;
3378
3379 /* detects if this particular field is 32bit only */
3380 if (((nv | ov) >> 32) == 0)
3381 delta = (s64)(s32)((u32)nv - (u32)ov);
3382
3383 /* filter anomalies, some drivers reset their stats
3384 * at down/up events.
3385 */
3386 if (delta > 0)
3387 res[i] += delta;
3388 }
3389 }
3390
3391 static void bond_get_stats(struct net_device *bond_dev,
3392 struct rtnl_link_stats64 *stats)
3393 {
3394 struct bonding *bond = netdev_priv(bond_dev);
3395 struct rtnl_link_stats64 temp;
3396 struct list_head *iter;
3397 struct slave *slave;
3398
3399 spin_lock(&bond->stats_lock);
3400 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3401
3402 rcu_read_lock();
3403 bond_for_each_slave_rcu(bond, slave, iter) {
3404 const struct rtnl_link_stats64 *new =
3405 dev_get_stats(slave->dev, &temp);
3406
3407 bond_fold_stats(stats, new, &slave->slave_stats);
3408
3409 /* save off the slave stats for the next run */
3410 memcpy(&slave->slave_stats, new, sizeof(*new));
3411 }
3412 rcu_read_unlock();
3413
3414 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3415 spin_unlock(&bond->stats_lock);
3416 }
3417
3418 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3419 {
3420 struct bonding *bond = netdev_priv(bond_dev);
3421 struct net_device *slave_dev = NULL;
3422 struct ifbond k_binfo;
3423 struct ifbond __user *u_binfo = NULL;
3424 struct ifslave k_sinfo;
3425 struct ifslave __user *u_sinfo = NULL;
3426 struct mii_ioctl_data *mii = NULL;
3427 struct bond_opt_value newval;
3428 struct net *net;
3429 int res = 0;
3430
3431 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3432
3433 switch (cmd) {
3434 case SIOCGMIIPHY:
3435 mii = if_mii(ifr);
3436 if (!mii)
3437 return -EINVAL;
3438
3439 mii->phy_id = 0;
3440 /* Fall Through */
3441 case SIOCGMIIREG:
3442 /* We do this again just in case we were called by SIOCGMIIREG
3443 * instead of SIOCGMIIPHY.
3444 */
3445 mii = if_mii(ifr);
3446 if (!mii)
3447 return -EINVAL;
3448
3449 if (mii->reg_num == 1) {
3450 mii->val_out = 0;
3451 if (netif_carrier_ok(bond->dev))
3452 mii->val_out = BMSR_LSTATUS;
3453 }
3454
3455 return 0;
3456 case BOND_INFO_QUERY_OLD:
3457 case SIOCBONDINFOQUERY:
3458 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3459
3460 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3461 return -EFAULT;
3462
3463 bond_info_query(bond_dev, &k_binfo);
3464 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3465 return -EFAULT;
3466
3467 return 0;
3468 case BOND_SLAVE_INFO_QUERY_OLD:
3469 case SIOCBONDSLAVEINFOQUERY:
3470 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3471
3472 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3473 return -EFAULT;
3474
3475 res = bond_slave_info_query(bond_dev, &k_sinfo);
3476 if (res == 0 &&
3477 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3478 return -EFAULT;
3479
3480 return res;
3481 default:
3482 break;
3483 }
3484
3485 net = dev_net(bond_dev);
3486
3487 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3488 return -EPERM;
3489
3490 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3491
3492 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3493
3494 if (!slave_dev)
3495 return -ENODEV;
3496
3497 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3498 switch (cmd) {
3499 case BOND_ENSLAVE_OLD:
3500 case SIOCBONDENSLAVE:
3501 res = bond_enslave(bond_dev, slave_dev, NULL);
3502 break;
3503 case BOND_RELEASE_OLD:
3504 case SIOCBONDRELEASE:
3505 res = bond_release(bond_dev, slave_dev);
3506 break;
3507 case BOND_SETHWADDR_OLD:
3508 case SIOCBONDSETHWADDR:
3509 bond_set_dev_addr(bond_dev, slave_dev);
3510 res = 0;
3511 break;
3512 case BOND_CHANGE_ACTIVE_OLD:
3513 case SIOCBONDCHANGEACTIVE:
3514 bond_opt_initstr(&newval, slave_dev->name);
3515 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3516 &newval);
3517 break;
3518 default:
3519 res = -EOPNOTSUPP;
3520 }
3521
3522 return res;
3523 }
3524
3525 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3526 {
3527 struct bonding *bond = netdev_priv(bond_dev);
3528
3529 if (change & IFF_PROMISC)
3530 bond_set_promiscuity(bond,
3531 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3532
3533 if (change & IFF_ALLMULTI)
3534 bond_set_allmulti(bond,
3535 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3536 }
3537
3538 static void bond_set_rx_mode(struct net_device *bond_dev)
3539 {
3540 struct bonding *bond = netdev_priv(bond_dev);
3541 struct list_head *iter;
3542 struct slave *slave;
3543
3544 rcu_read_lock();
3545 if (bond_uses_primary(bond)) {
3546 slave = rcu_dereference(bond->curr_active_slave);
3547 if (slave) {
3548 dev_uc_sync(slave->dev, bond_dev);
3549 dev_mc_sync(slave->dev, bond_dev);
3550 }
3551 } else {
3552 bond_for_each_slave_rcu(bond, slave, iter) {
3553 dev_uc_sync_multiple(slave->dev, bond_dev);
3554 dev_mc_sync_multiple(slave->dev, bond_dev);
3555 }
3556 }
3557 rcu_read_unlock();
3558 }
3559
3560 static int bond_neigh_init(struct neighbour *n)
3561 {
3562 struct bonding *bond = netdev_priv(n->dev);
3563 const struct net_device_ops *slave_ops;
3564 struct neigh_parms parms;
3565 struct slave *slave;
3566 int ret;
3567
3568 slave = bond_first_slave(bond);
3569 if (!slave)
3570 return 0;
3571 slave_ops = slave->dev->netdev_ops;
3572 if (!slave_ops->ndo_neigh_setup)
3573 return 0;
3574
3575 parms.neigh_setup = NULL;
3576 parms.neigh_cleanup = NULL;
3577 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3578 if (ret)
3579 return ret;
3580
3581 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3582 * after the last slave has been detached. Assumes that all slaves
3583 * utilize the same neigh_cleanup (true at this writing as only user
3584 * is ipoib).
3585 */
3586 n->parms->neigh_cleanup = parms.neigh_cleanup;
3587
3588 if (!parms.neigh_setup)
3589 return 0;
3590
3591 return parms.neigh_setup(n);
3592 }
3593
3594 /* The bonding ndo_neigh_setup is called at init time beofre any
3595 * slave exists. So we must declare proxy setup function which will
3596 * be used at run time to resolve the actual slave neigh param setup.
3597 *
3598 * It's also called by master devices (such as vlans) to setup their
3599 * underlying devices. In that case - do nothing, we're already set up from
3600 * our init.
3601 */
3602 static int bond_neigh_setup(struct net_device *dev,
3603 struct neigh_parms *parms)
3604 {
3605 /* modify only our neigh_parms */
3606 if (parms->dev == dev)
3607 parms->neigh_setup = bond_neigh_init;
3608
3609 return 0;
3610 }
3611
3612 /* Change the MTU of all of a master's slaves to match the master */
3613 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3614 {
3615 struct bonding *bond = netdev_priv(bond_dev);
3616 struct slave *slave, *rollback_slave;
3617 struct list_head *iter;
3618 int res = 0;
3619
3620 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3621
3622 bond_for_each_slave(bond, slave, iter) {
3623 netdev_dbg(bond_dev, "s %p c_m %p\n",
3624 slave, slave->dev->netdev_ops->ndo_change_mtu);
3625
3626 res = dev_set_mtu(slave->dev, new_mtu);
3627
3628 if (res) {
3629 /* If we failed to set the slave's mtu to the new value
3630 * we must abort the operation even in ACTIVE_BACKUP
3631 * mode, because if we allow the backup slaves to have
3632 * different mtu values than the active slave we'll
3633 * need to change their mtu when doing a failover. That
3634 * means changing their mtu from timer context, which
3635 * is probably not a good idea.
3636 */
3637 netdev_dbg(bond_dev, "err %d %s\n", res,
3638 slave->dev->name);
3639 goto unwind;
3640 }
3641 }
3642
3643 bond_dev->mtu = new_mtu;
3644
3645 return 0;
3646
3647 unwind:
3648 /* unwind from head to the slave that failed */
3649 bond_for_each_slave(bond, rollback_slave, iter) {
3650 int tmp_res;
3651
3652 if (rollback_slave == slave)
3653 break;
3654
3655 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3656 if (tmp_res) {
3657 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3658 tmp_res, rollback_slave->dev->name);
3659 }
3660 }
3661
3662 return res;
3663 }
3664
3665 /* Change HW address
3666 *
3667 * Note that many devices must be down to change the HW address, and
3668 * downing the master releases all slaves. We can make bonds full of
3669 * bonding devices to test this, however.
3670 */
3671 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3672 {
3673 struct bonding *bond = netdev_priv(bond_dev);
3674 struct slave *slave, *rollback_slave;
3675 struct sockaddr_storage *ss = addr, tmp_ss;
3676 struct list_head *iter;
3677 int res = 0;
3678
3679 if (BOND_MODE(bond) == BOND_MODE_ALB)
3680 return bond_alb_set_mac_address(bond_dev, addr);
3681
3682
3683 netdev_dbg(bond_dev, "bond=%p\n", bond);
3684
3685 /* If fail_over_mac is enabled, do nothing and return success.
3686 * Returning an error causes ifenslave to fail.
3687 */
3688 if (bond->params.fail_over_mac &&
3689 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3690 return 0;
3691
3692 if (!is_valid_ether_addr(ss->__data))
3693 return -EADDRNOTAVAIL;
3694
3695 bond_for_each_slave(bond, slave, iter) {
3696 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3697 res = dev_set_mac_address(slave->dev, addr);
3698 if (res) {
3699 /* TODO: consider downing the slave
3700 * and retry ?
3701 * User should expect communications
3702 * breakage anyway until ARP finish
3703 * updating, so...
3704 */
3705 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3706 goto unwind;
3707 }
3708 }
3709
3710 /* success */
3711 memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
3712 return 0;
3713
3714 unwind:
3715 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
3716 tmp_ss.ss_family = bond_dev->type;
3717
3718 /* unwind from head to the slave that failed */
3719 bond_for_each_slave(bond, rollback_slave, iter) {
3720 int tmp_res;
3721
3722 if (rollback_slave == slave)
3723 break;
3724
3725 tmp_res = dev_set_mac_address(rollback_slave->dev,
3726 (struct sockaddr *)&tmp_ss);
3727 if (tmp_res) {
3728 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3729 tmp_res, rollback_slave->dev->name);
3730 }
3731 }
3732
3733 return res;
3734 }
3735
3736 /**
3737 * bond_xmit_slave_id - transmit skb through slave with slave_id
3738 * @bond: bonding device that is transmitting
3739 * @skb: buffer to transmit
3740 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3741 *
3742 * This function tries to transmit through slave with slave_id but in case
3743 * it fails, it tries to find the first available slave for transmission.
3744 * The skb is consumed in all cases, thus the function is void.
3745 */
3746 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3747 {
3748 struct list_head *iter;
3749 struct slave *slave;
3750 int i = slave_id;
3751
3752 /* Here we start from the slave with slave_id */
3753 bond_for_each_slave_rcu(bond, slave, iter) {
3754 if (--i < 0) {
3755 if (bond_slave_can_tx(slave)) {
3756 bond_dev_queue_xmit(bond, skb, slave->dev);
3757 return;
3758 }
3759 }
3760 }
3761
3762 /* Here we start from the first slave up to slave_id */
3763 i = slave_id;
3764 bond_for_each_slave_rcu(bond, slave, iter) {
3765 if (--i < 0)
3766 break;
3767 if (bond_slave_can_tx(slave)) {
3768 bond_dev_queue_xmit(bond, skb, slave->dev);
3769 return;
3770 }
3771 }
3772 /* no slave that can tx has been found */
3773 bond_tx_drop(bond->dev, skb);
3774 }
3775
3776 /**
3777 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3778 * @bond: bonding device to use
3779 *
3780 * Based on the value of the bonding device's packets_per_slave parameter
3781 * this function generates a slave id, which is usually used as the next
3782 * slave to transmit through.
3783 */
3784 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3785 {
3786 u32 slave_id;
3787 struct reciprocal_value reciprocal_packets_per_slave;
3788 int packets_per_slave = bond->params.packets_per_slave;
3789
3790 switch (packets_per_slave) {
3791 case 0:
3792 slave_id = prandom_u32();
3793 break;
3794 case 1:
3795 slave_id = bond->rr_tx_counter;
3796 break;
3797 default:
3798 reciprocal_packets_per_slave =
3799 bond->params.reciprocal_packets_per_slave;
3800 slave_id = reciprocal_divide(bond->rr_tx_counter,
3801 reciprocal_packets_per_slave);
3802 break;
3803 }
3804 bond->rr_tx_counter++;
3805
3806 return slave_id;
3807 }
3808
3809 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3810 {
3811 struct bonding *bond = netdev_priv(bond_dev);
3812 struct iphdr *iph = ip_hdr(skb);
3813 struct slave *slave;
3814 u32 slave_id;
3815
3816 /* Start with the curr_active_slave that joined the bond as the
3817 * default for sending IGMP traffic. For failover purposes one
3818 * needs to maintain some consistency for the interface that will
3819 * send the join/membership reports. The curr_active_slave found
3820 * will send all of this type of traffic.
3821 */
3822 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3823 slave = rcu_dereference(bond->curr_active_slave);
3824 if (slave)
3825 bond_dev_queue_xmit(bond, skb, slave->dev);
3826 else
3827 bond_xmit_slave_id(bond, skb, 0);
3828 } else {
3829 int slave_cnt = READ_ONCE(bond->slave_cnt);
3830
3831 if (likely(slave_cnt)) {
3832 slave_id = bond_rr_gen_slave_id(bond);
3833 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3834 } else {
3835 bond_tx_drop(bond_dev, skb);
3836 }
3837 }
3838
3839 return NETDEV_TX_OK;
3840 }
3841
3842 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3843 * the bond has a usable interface.
3844 */
3845 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3846 {
3847 struct bonding *bond = netdev_priv(bond_dev);
3848 struct slave *slave;
3849
3850 slave = rcu_dereference(bond->curr_active_slave);
3851 if (slave)
3852 bond_dev_queue_xmit(bond, skb, slave->dev);
3853 else
3854 bond_tx_drop(bond_dev, skb);
3855
3856 return NETDEV_TX_OK;
3857 }
3858
3859 /* Use this to update slave_array when (a) it's not appropriate to update
3860 * slave_array right away (note that update_slave_array() may sleep)
3861 * and / or (b) RTNL is not held.
3862 */
3863 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3864 {
3865 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3866 }
3867
3868 /* Slave array work handler. Holds only RTNL */
3869 static void bond_slave_arr_handler(struct work_struct *work)
3870 {
3871 struct bonding *bond = container_of(work, struct bonding,
3872 slave_arr_work.work);
3873 int ret;
3874
3875 if (!rtnl_trylock())
3876 goto err;
3877
3878 ret = bond_update_slave_arr(bond, NULL);
3879 rtnl_unlock();
3880 if (ret) {
3881 pr_warn_ratelimited("Failed to update slave array from WT\n");
3882 goto err;
3883 }
3884 return;
3885
3886 err:
3887 bond_slave_arr_work_rearm(bond, 1);
3888 }
3889
3890 /* Build the usable slaves array in control path for modes that use xmit-hash
3891 * to determine the slave interface -
3892 * (a) BOND_MODE_8023AD
3893 * (b) BOND_MODE_XOR
3894 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3895 *
3896 * The caller is expected to hold RTNL only and NO other lock!
3897 */
3898 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3899 {
3900 struct slave *slave;
3901 struct list_head *iter;
3902 struct bond_up_slave *new_arr, *old_arr;
3903 int agg_id = 0;
3904 int ret = 0;
3905
3906 #ifdef CONFIG_LOCKDEP
3907 WARN_ON(lockdep_is_held(&bond->mode_lock));
3908 #endif
3909
3910 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3911 GFP_KERNEL);
3912 if (!new_arr) {
3913 ret = -ENOMEM;
3914 pr_err("Failed to build slave-array.\n");
3915 goto out;
3916 }
3917 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3918 struct ad_info ad_info;
3919
3920 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3921 pr_debug("bond_3ad_get_active_agg_info failed\n");
3922 kfree_rcu(new_arr, rcu);
3923 /* No active aggragator means it's not safe to use
3924 * the previous array.
3925 */
3926 old_arr = rtnl_dereference(bond->slave_arr);
3927 if (old_arr) {
3928 RCU_INIT_POINTER(bond->slave_arr, NULL);
3929 kfree_rcu(old_arr, rcu);
3930 }
3931 goto out;
3932 }
3933 agg_id = ad_info.aggregator_id;
3934 }
3935 bond_for_each_slave(bond, slave, iter) {
3936 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3937 struct aggregator *agg;
3938
3939 agg = SLAVE_AD_INFO(slave)->port.aggregator;
3940 if (!agg || agg->aggregator_identifier != agg_id)
3941 continue;
3942 }
3943 if (!bond_slave_can_tx(slave))
3944 continue;
3945 if (skipslave == slave)
3946 continue;
3947 new_arr->arr[new_arr->count++] = slave;
3948 }
3949
3950 old_arr = rtnl_dereference(bond->slave_arr);
3951 rcu_assign_pointer(bond->slave_arr, new_arr);
3952 if (old_arr)
3953 kfree_rcu(old_arr, rcu);
3954 out:
3955 if (ret != 0 && skipslave) {
3956 int idx;
3957
3958 /* Rare situation where caller has asked to skip a specific
3959 * slave but allocation failed (most likely!). BTW this is
3960 * only possible when the call is initiated from
3961 * __bond_release_one(). In this situation; overwrite the
3962 * skipslave entry in the array with the last entry from the
3963 * array to avoid a situation where the xmit path may choose
3964 * this to-be-skipped slave to send a packet out.
3965 */
3966 old_arr = rtnl_dereference(bond->slave_arr);
3967 for (idx = 0; idx < old_arr->count; idx++) {
3968 if (skipslave == old_arr->arr[idx]) {
3969 old_arr->arr[idx] =
3970 old_arr->arr[old_arr->count-1];
3971 old_arr->count--;
3972 break;
3973 }
3974 }
3975 }
3976 return ret;
3977 }
3978
3979 /* Use this Xmit function for 3AD as well as XOR modes. The current
3980 * usable slave array is formed in the control path. The xmit function
3981 * just calculates hash and sends the packet out.
3982 */
3983 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3984 {
3985 struct bonding *bond = netdev_priv(dev);
3986 struct slave *slave;
3987 struct bond_up_slave *slaves;
3988 unsigned int count;
3989
3990 slaves = rcu_dereference(bond->slave_arr);
3991 count = slaves ? READ_ONCE(slaves->count) : 0;
3992 if (likely(count)) {
3993 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3994 bond_dev_queue_xmit(bond, skb, slave->dev);
3995 } else {
3996 bond_tx_drop(dev, skb);
3997 }
3998
3999 return NETDEV_TX_OK;
4000 }
4001
4002 /* in broadcast mode, we send everything to all usable interfaces. */
4003 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4004 {
4005 struct bonding *bond = netdev_priv(bond_dev);
4006 struct slave *slave = NULL;
4007 struct list_head *iter;
4008
4009 bond_for_each_slave_rcu(bond, slave, iter) {
4010 if (bond_is_last_slave(bond, slave))
4011 break;
4012 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4013 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4014
4015 if (!skb2) {
4016 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4017 bond_dev->name, __func__);
4018 continue;
4019 }
4020 bond_dev_queue_xmit(bond, skb2, slave->dev);
4021 }
4022 }
4023 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4024 bond_dev_queue_xmit(bond, skb, slave->dev);
4025 else
4026 bond_tx_drop(bond_dev, skb);
4027
4028 return NETDEV_TX_OK;
4029 }
4030
4031 /*------------------------- Device initialization ---------------------------*/
4032
4033 /* Lookup the slave that corresponds to a qid */
4034 static inline int bond_slave_override(struct bonding *bond,
4035 struct sk_buff *skb)
4036 {
4037 struct slave *slave = NULL;
4038 struct list_head *iter;
4039
4040 if (!skb->queue_mapping)
4041 return 1;
4042
4043 /* Find out if any slaves have the same mapping as this skb. */
4044 bond_for_each_slave_rcu(bond, slave, iter) {
4045 if (slave->queue_id == skb->queue_mapping) {
4046 if (bond_slave_is_up(slave) &&
4047 slave->link == BOND_LINK_UP) {
4048 bond_dev_queue_xmit(bond, skb, slave->dev);
4049 return 0;
4050 }
4051 /* If the slave isn't UP, use default transmit policy. */
4052 break;
4053 }
4054 }
4055
4056 return 1;
4057 }
4058
4059
4060 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4061 void *accel_priv, select_queue_fallback_t fallback)
4062 {
4063 /* This helper function exists to help dev_pick_tx get the correct
4064 * destination queue. Using a helper function skips a call to
4065 * skb_tx_hash and will put the skbs in the queue we expect on their
4066 * way down to the bonding driver.
4067 */
4068 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4069
4070 /* Save the original txq to restore before passing to the driver */
4071 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4072
4073 if (unlikely(txq >= dev->real_num_tx_queues)) {
4074 do {
4075 txq -= dev->real_num_tx_queues;
4076 } while (txq >= dev->real_num_tx_queues);
4077 }
4078 return txq;
4079 }
4080
4081 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4082 {
4083 struct bonding *bond = netdev_priv(dev);
4084
4085 if (bond_should_override_tx_queue(bond) &&
4086 !bond_slave_override(bond, skb))
4087 return NETDEV_TX_OK;
4088
4089 switch (BOND_MODE(bond)) {
4090 case BOND_MODE_ROUNDROBIN:
4091 return bond_xmit_roundrobin(skb, dev);
4092 case BOND_MODE_ACTIVEBACKUP:
4093 return bond_xmit_activebackup(skb, dev);
4094 case BOND_MODE_8023AD:
4095 case BOND_MODE_XOR:
4096 return bond_3ad_xor_xmit(skb, dev);
4097 case BOND_MODE_BROADCAST:
4098 return bond_xmit_broadcast(skb, dev);
4099 case BOND_MODE_ALB:
4100 return bond_alb_xmit(skb, dev);
4101 case BOND_MODE_TLB:
4102 return bond_tlb_xmit(skb, dev);
4103 default:
4104 /* Should never happen, mode already checked */
4105 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4106 WARN_ON_ONCE(1);
4107 bond_tx_drop(dev, skb);
4108 return NETDEV_TX_OK;
4109 }
4110 }
4111
4112 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4113 {
4114 struct bonding *bond = netdev_priv(dev);
4115 netdev_tx_t ret = NETDEV_TX_OK;
4116
4117 /* If we risk deadlock from transmitting this in the
4118 * netpoll path, tell netpoll to queue the frame for later tx
4119 */
4120 if (unlikely(is_netpoll_tx_blocked(dev)))
4121 return NETDEV_TX_BUSY;
4122
4123 rcu_read_lock();
4124 if (bond_has_slaves(bond))
4125 ret = __bond_start_xmit(skb, dev);
4126 else
4127 bond_tx_drop(dev, skb);
4128 rcu_read_unlock();
4129
4130 return ret;
4131 }
4132
4133 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4134 struct ethtool_link_ksettings *cmd)
4135 {
4136 struct bonding *bond = netdev_priv(bond_dev);
4137 unsigned long speed = 0;
4138 struct list_head *iter;
4139 struct slave *slave;
4140
4141 cmd->base.duplex = DUPLEX_UNKNOWN;
4142 cmd->base.port = PORT_OTHER;
4143
4144 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4145 * do not need to check mode. Though link speed might not represent
4146 * the true receive or transmit bandwidth (not all modes are symmetric)
4147 * this is an accurate maximum.
4148 */
4149 bond_for_each_slave(bond, slave, iter) {
4150 if (bond_slave_can_tx(slave)) {
4151 if (slave->speed != SPEED_UNKNOWN)
4152 speed += slave->speed;
4153 if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4154 slave->duplex != DUPLEX_UNKNOWN)
4155 cmd->base.duplex = slave->duplex;
4156 }
4157 }
4158 cmd->base.speed = speed ? : SPEED_UNKNOWN;
4159
4160 return 0;
4161 }
4162
4163 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4164 struct ethtool_drvinfo *drvinfo)
4165 {
4166 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4167 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4168 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4169 BOND_ABI_VERSION);
4170 }
4171
4172 static const struct ethtool_ops bond_ethtool_ops = {
4173 .get_drvinfo = bond_ethtool_get_drvinfo,
4174 .get_link = ethtool_op_get_link,
4175 .get_link_ksettings = bond_ethtool_get_link_ksettings,
4176 };
4177
4178 static const struct net_device_ops bond_netdev_ops = {
4179 .ndo_init = bond_init,
4180 .ndo_uninit = bond_uninit,
4181 .ndo_open = bond_open,
4182 .ndo_stop = bond_close,
4183 .ndo_start_xmit = bond_start_xmit,
4184 .ndo_select_queue = bond_select_queue,
4185 .ndo_get_stats64 = bond_get_stats,
4186 .ndo_do_ioctl = bond_do_ioctl,
4187 .ndo_change_rx_flags = bond_change_rx_flags,
4188 .ndo_set_rx_mode = bond_set_rx_mode,
4189 .ndo_change_mtu = bond_change_mtu,
4190 .ndo_set_mac_address = bond_set_mac_address,
4191 .ndo_neigh_setup = bond_neigh_setup,
4192 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4193 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4194 #ifdef CONFIG_NET_POLL_CONTROLLER
4195 .ndo_netpoll_setup = bond_netpoll_setup,
4196 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4197 .ndo_poll_controller = bond_poll_controller,
4198 #endif
4199 .ndo_add_slave = bond_enslave,
4200 .ndo_del_slave = bond_release,
4201 .ndo_fix_features = bond_fix_features,
4202 .ndo_features_check = passthru_features_check,
4203 };
4204
4205 static const struct device_type bond_type = {
4206 .name = "bond",
4207 };
4208
4209 static void bond_destructor(struct net_device *bond_dev)
4210 {
4211 struct bonding *bond = netdev_priv(bond_dev);
4212 if (bond->wq)
4213 destroy_workqueue(bond->wq);
4214 }
4215
4216 void bond_setup(struct net_device *bond_dev)
4217 {
4218 struct bonding *bond = netdev_priv(bond_dev);
4219
4220 spin_lock_init(&bond->mode_lock);
4221 spin_lock_init(&bond->stats_lock);
4222 bond->params = bonding_defaults;
4223
4224 /* Initialize pointers */
4225 bond->dev = bond_dev;
4226
4227 /* Initialize the device entry points */
4228 ether_setup(bond_dev);
4229 bond_dev->max_mtu = ETH_MAX_MTU;
4230 bond_dev->netdev_ops = &bond_netdev_ops;
4231 bond_dev->ethtool_ops = &bond_ethtool_ops;
4232
4233 bond_dev->needs_free_netdev = true;
4234 bond_dev->priv_destructor = bond_destructor;
4235
4236 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4237
4238 /* Initialize the device options */
4239 bond_dev->flags |= IFF_MASTER;
4240 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4241 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4242
4243 /* don't acquire bond device's netif_tx_lock when transmitting */
4244 bond_dev->features |= NETIF_F_LLTX;
4245
4246 /* By default, we declare the bond to be fully
4247 * VLAN hardware accelerated capable. Special
4248 * care is taken in the various xmit functions
4249 * when there are slaves that are not hw accel
4250 * capable
4251 */
4252
4253 /* Don't allow bond devices to change network namespaces. */
4254 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4255
4256 bond_dev->hw_features = BOND_VLAN_FEATURES |
4257 NETIF_F_HW_VLAN_CTAG_TX |
4258 NETIF_F_HW_VLAN_CTAG_RX |
4259 NETIF_F_HW_VLAN_CTAG_FILTER;
4260
4261 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4262 bond_dev->features |= bond_dev->hw_features;
4263 }
4264
4265 /* Destroy a bonding device.
4266 * Must be under rtnl_lock when this function is called.
4267 */
4268 static void bond_uninit(struct net_device *bond_dev)
4269 {
4270 struct bonding *bond = netdev_priv(bond_dev);
4271 struct list_head *iter;
4272 struct slave *slave;
4273 struct bond_up_slave *arr;
4274
4275 bond_netpoll_cleanup(bond_dev);
4276
4277 /* Release the bonded slaves */
4278 bond_for_each_slave(bond, slave, iter)
4279 __bond_release_one(bond_dev, slave->dev, true, true);
4280 netdev_info(bond_dev, "Released all slaves\n");
4281
4282 arr = rtnl_dereference(bond->slave_arr);
4283 if (arr) {
4284 RCU_INIT_POINTER(bond->slave_arr, NULL);
4285 kfree_rcu(arr, rcu);
4286 }
4287
4288 list_del(&bond->bond_list);
4289
4290 bond_debug_unregister(bond);
4291 }
4292
4293 /*------------------------- Module initialization ---------------------------*/
4294
4295 static int bond_check_params(struct bond_params *params)
4296 {
4297 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4298 struct bond_opt_value newval;
4299 const struct bond_opt_value *valptr;
4300 int arp_all_targets_value = 0;
4301 u16 ad_actor_sys_prio = 0;
4302 u16 ad_user_port_key = 0;
4303 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4304 int arp_ip_count;
4305 int bond_mode = BOND_MODE_ROUNDROBIN;
4306 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4307 int lacp_fast = 0;
4308 int tlb_dynamic_lb;
4309
4310 /* Convert string parameters. */
4311 if (mode) {
4312 bond_opt_initstr(&newval, mode);
4313 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4314 if (!valptr) {
4315 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4316 return -EINVAL;
4317 }
4318 bond_mode = valptr->value;
4319 }
4320
4321 if (xmit_hash_policy) {
4322 if ((bond_mode != BOND_MODE_XOR) &&
4323 (bond_mode != BOND_MODE_8023AD) &&
4324 (bond_mode != BOND_MODE_TLB)) {
4325 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4326 bond_mode_name(bond_mode));
4327 } else {
4328 bond_opt_initstr(&newval, xmit_hash_policy);
4329 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4330 &newval);
4331 if (!valptr) {
4332 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4333 xmit_hash_policy);
4334 return -EINVAL;
4335 }
4336 xmit_hashtype = valptr->value;
4337 }
4338 }
4339
4340 if (lacp_rate) {
4341 if (bond_mode != BOND_MODE_8023AD) {
4342 pr_info("lacp_rate param is irrelevant in mode %s\n",
4343 bond_mode_name(bond_mode));
4344 } else {
4345 bond_opt_initstr(&newval, lacp_rate);
4346 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4347 &newval);
4348 if (!valptr) {
4349 pr_err("Error: Invalid lacp rate \"%s\"\n",
4350 lacp_rate);
4351 return -EINVAL;
4352 }
4353 lacp_fast = valptr->value;
4354 }
4355 }
4356
4357 if (ad_select) {
4358 bond_opt_initstr(&newval, ad_select);
4359 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4360 &newval);
4361 if (!valptr) {
4362 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4363 return -EINVAL;
4364 }
4365 params->ad_select = valptr->value;
4366 if (bond_mode != BOND_MODE_8023AD)
4367 pr_warn("ad_select param only affects 802.3ad mode\n");
4368 } else {
4369 params->ad_select = BOND_AD_STABLE;
4370 }
4371
4372 if (max_bonds < 0) {
4373 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4374 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4375 max_bonds = BOND_DEFAULT_MAX_BONDS;
4376 }
4377
4378 if (miimon < 0) {
4379 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4380 miimon, INT_MAX);
4381 miimon = 0;
4382 }
4383
4384 if (updelay < 0) {
4385 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4386 updelay, INT_MAX);
4387 updelay = 0;
4388 }
4389
4390 if (downdelay < 0) {
4391 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4392 downdelay, INT_MAX);
4393 downdelay = 0;
4394 }
4395
4396 if ((use_carrier != 0) && (use_carrier != 1)) {
4397 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4398 use_carrier);
4399 use_carrier = 1;
4400 }
4401
4402 if (num_peer_notif < 0 || num_peer_notif > 255) {
4403 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4404 num_peer_notif);
4405 num_peer_notif = 1;
4406 }
4407
4408 /* reset values for 802.3ad/TLB/ALB */
4409 if (!bond_mode_uses_arp(bond_mode)) {
4410 if (!miimon) {
4411 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");
4412 pr_warn("Forcing miimon to 100msec\n");
4413 miimon = BOND_DEFAULT_MIIMON;
4414 }
4415 }
4416
4417 if (tx_queues < 1 || tx_queues > 255) {
4418 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4419 tx_queues, BOND_DEFAULT_TX_QUEUES);
4420 tx_queues = BOND_DEFAULT_TX_QUEUES;
4421 }
4422
4423 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4424 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4425 all_slaves_active);
4426 all_slaves_active = 0;
4427 }
4428
4429 if (resend_igmp < 0 || resend_igmp > 255) {
4430 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4431 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4432 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4433 }
4434
4435 bond_opt_initval(&newval, packets_per_slave);
4436 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4437 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4438 packets_per_slave, USHRT_MAX);
4439 packets_per_slave = 1;
4440 }
4441
4442 if (bond_mode == BOND_MODE_ALB) {
4443 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",
4444 updelay);
4445 }
4446
4447 if (!miimon) {
4448 if (updelay || downdelay) {
4449 /* just warn the user the up/down delay will have
4450 * no effect since miimon is zero...
4451 */
4452 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",
4453 updelay, downdelay);
4454 }
4455 } else {
4456 /* don't allow arp monitoring */
4457 if (arp_interval) {
4458 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4459 miimon, arp_interval);
4460 arp_interval = 0;
4461 }
4462
4463 if ((updelay % miimon) != 0) {
4464 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4465 updelay, miimon, (updelay / miimon) * miimon);
4466 }
4467
4468 updelay /= miimon;
4469
4470 if ((downdelay % miimon) != 0) {
4471 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4472 downdelay, miimon,
4473 (downdelay / miimon) * miimon);
4474 }
4475
4476 downdelay /= miimon;
4477 }
4478
4479 if (arp_interval < 0) {
4480 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4481 arp_interval, INT_MAX);
4482 arp_interval = 0;
4483 }
4484
4485 for (arp_ip_count = 0, i = 0;
4486 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4487 __be32 ip;
4488
4489 /* not a complete check, but good enough to catch mistakes */
4490 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4491 !bond_is_ip_target_ok(ip)) {
4492 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4493 arp_ip_target[i]);
4494 arp_interval = 0;
4495 } else {
4496 if (bond_get_targets_ip(arp_target, ip) == -1)
4497 arp_target[arp_ip_count++] = ip;
4498 else
4499 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4500 &ip);
4501 }
4502 }
4503
4504 if (arp_interval && !arp_ip_count) {
4505 /* don't allow arping if no arp_ip_target given... */
4506 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4507 arp_interval);
4508 arp_interval = 0;
4509 }
4510
4511 if (arp_validate) {
4512 if (!arp_interval) {
4513 pr_err("arp_validate requires arp_interval\n");
4514 return -EINVAL;
4515 }
4516
4517 bond_opt_initstr(&newval, arp_validate);
4518 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4519 &newval);
4520 if (!valptr) {
4521 pr_err("Error: invalid arp_validate \"%s\"\n",
4522 arp_validate);
4523 return -EINVAL;
4524 }
4525 arp_validate_value = valptr->value;
4526 } else {
4527 arp_validate_value = 0;
4528 }
4529
4530 if (arp_all_targets) {
4531 bond_opt_initstr(&newval, arp_all_targets);
4532 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4533 &newval);
4534 if (!valptr) {
4535 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4536 arp_all_targets);
4537 arp_all_targets_value = 0;
4538 } else {
4539 arp_all_targets_value = valptr->value;
4540 }
4541 }
4542
4543 if (miimon) {
4544 pr_info("MII link monitoring set to %d ms\n", miimon);
4545 } else if (arp_interval) {
4546 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4547 arp_validate_value);
4548 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4549 arp_interval, valptr->string, arp_ip_count);
4550
4551 for (i = 0; i < arp_ip_count; i++)
4552 pr_cont(" %s", arp_ip_target[i]);
4553
4554 pr_cont("\n");
4555
4556 } else if (max_bonds) {
4557 /* miimon and arp_interval not set, we need one so things
4558 * work as expected, see bonding.txt for details
4559 */
4560 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");
4561 }
4562
4563 if (primary && !bond_mode_uses_primary(bond_mode)) {
4564 /* currently, using a primary only makes sense
4565 * in active backup, TLB or ALB modes
4566 */
4567 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4568 primary, bond_mode_name(bond_mode));
4569 primary = NULL;
4570 }
4571
4572 if (primary && primary_reselect) {
4573 bond_opt_initstr(&newval, primary_reselect);
4574 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4575 &newval);
4576 if (!valptr) {
4577 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4578 primary_reselect);
4579 return -EINVAL;
4580 }
4581 primary_reselect_value = valptr->value;
4582 } else {
4583 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4584 }
4585
4586 if (fail_over_mac) {
4587 bond_opt_initstr(&newval, fail_over_mac);
4588 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4589 &newval);
4590 if (!valptr) {
4591 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4592 fail_over_mac);
4593 return -EINVAL;
4594 }
4595 fail_over_mac_value = valptr->value;
4596 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4597 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4598 } else {
4599 fail_over_mac_value = BOND_FOM_NONE;
4600 }
4601
4602 bond_opt_initstr(&newval, "default");
4603 valptr = bond_opt_parse(
4604 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4605 &newval);
4606 if (!valptr) {
4607 pr_err("Error: No ad_actor_sys_prio default value");
4608 return -EINVAL;
4609 }
4610 ad_actor_sys_prio = valptr->value;
4611
4612 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4613 &newval);
4614 if (!valptr) {
4615 pr_err("Error: No ad_user_port_key default value");
4616 return -EINVAL;
4617 }
4618 ad_user_port_key = valptr->value;
4619
4620 bond_opt_initstr(&newval, "default");
4621 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
4622 if (!valptr) {
4623 pr_err("Error: No tlb_dynamic_lb default value");
4624 return -EINVAL;
4625 }
4626 tlb_dynamic_lb = valptr->value;
4627
4628 if (lp_interval == 0) {
4629 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4630 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4631 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4632 }
4633
4634 /* fill params struct with the proper values */
4635 params->mode = bond_mode;
4636 params->xmit_policy = xmit_hashtype;
4637 params->miimon = miimon;
4638 params->num_peer_notif = num_peer_notif;
4639 params->arp_interval = arp_interval;
4640 params->arp_validate = arp_validate_value;
4641 params->arp_all_targets = arp_all_targets_value;
4642 params->updelay = updelay;
4643 params->downdelay = downdelay;
4644 params->use_carrier = use_carrier;
4645 params->lacp_fast = lacp_fast;
4646 params->primary[0] = 0;
4647 params->primary_reselect = primary_reselect_value;
4648 params->fail_over_mac = fail_over_mac_value;
4649 params->tx_queues = tx_queues;
4650 params->all_slaves_active = all_slaves_active;
4651 params->resend_igmp = resend_igmp;
4652 params->min_links = min_links;
4653 params->lp_interval = lp_interval;
4654 params->packets_per_slave = packets_per_slave;
4655 params->tlb_dynamic_lb = tlb_dynamic_lb;
4656 params->ad_actor_sys_prio = ad_actor_sys_prio;
4657 eth_zero_addr(params->ad_actor_system);
4658 params->ad_user_port_key = ad_user_port_key;
4659 if (packets_per_slave > 0) {
4660 params->reciprocal_packets_per_slave =
4661 reciprocal_value(packets_per_slave);
4662 } else {
4663 /* reciprocal_packets_per_slave is unused if
4664 * packets_per_slave is 0 or 1, just initialize it
4665 */
4666 params->reciprocal_packets_per_slave =
4667 (struct reciprocal_value) { 0 };
4668 }
4669
4670 if (primary) {
4671 strncpy(params->primary, primary, IFNAMSIZ);
4672 params->primary[IFNAMSIZ - 1] = 0;
4673 }
4674
4675 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4676
4677 return 0;
4678 }
4679
4680 /* Called from registration process */
4681 static int bond_init(struct net_device *bond_dev)
4682 {
4683 struct bonding *bond = netdev_priv(bond_dev);
4684 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4685
4686 netdev_dbg(bond_dev, "Begin bond_init\n");
4687
4688 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
4689 if (!bond->wq)
4690 return -ENOMEM;
4691
4692 netdev_lockdep_set_classes(bond_dev);
4693
4694 list_add_tail(&bond->bond_list, &bn->dev_list);
4695
4696 bond_prepare_sysfs_group(bond);
4697
4698 bond_debug_register(bond);
4699
4700 /* Ensure valid dev_addr */
4701 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4702 bond_dev->addr_assign_type == NET_ADDR_PERM)
4703 eth_hw_addr_random(bond_dev);
4704
4705 return 0;
4706 }
4707
4708 unsigned int bond_get_num_tx_queues(void)
4709 {
4710 return tx_queues;
4711 }
4712
4713 /* Create a new bond based on the specified name and bonding parameters.
4714 * If name is NULL, obtain a suitable "bond%d" name for us.
4715 * Caller must NOT hold rtnl_lock; we need to release it here before we
4716 * set up our sysfs entries.
4717 */
4718 int bond_create(struct net *net, const char *name)
4719 {
4720 struct net_device *bond_dev;
4721 struct bonding *bond;
4722 struct alb_bond_info *bond_info;
4723 int res;
4724
4725 rtnl_lock();
4726
4727 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4728 name ? name : "bond%d", NET_NAME_UNKNOWN,
4729 bond_setup, tx_queues);
4730 if (!bond_dev) {
4731 pr_err("%s: eek! can't alloc netdev!\n", name);
4732 rtnl_unlock();
4733 return -ENOMEM;
4734 }
4735
4736 /*
4737 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4738 * It is set to 0 by default which is wrong.
4739 */
4740 bond = netdev_priv(bond_dev);
4741 bond_info = &(BOND_ALB_INFO(bond));
4742 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4743
4744 dev_net_set(bond_dev, net);
4745 bond_dev->rtnl_link_ops = &bond_link_ops;
4746
4747 res = register_netdevice(bond_dev);
4748
4749 netif_carrier_off(bond_dev);
4750
4751 bond_work_init_all(bond);
4752
4753 rtnl_unlock();
4754 if (res < 0)
4755 free_netdev(bond_dev);
4756 return res;
4757 }
4758
4759 static int __net_init bond_net_init(struct net *net)
4760 {
4761 struct bond_net *bn = net_generic(net, bond_net_id);
4762
4763 bn->net = net;
4764 INIT_LIST_HEAD(&bn->dev_list);
4765
4766 bond_create_proc_dir(bn);
4767 bond_create_sysfs(bn);
4768
4769 return 0;
4770 }
4771
4772 static void __net_exit bond_net_exit(struct net *net)
4773 {
4774 struct bond_net *bn = net_generic(net, bond_net_id);
4775 struct bonding *bond, *tmp_bond;
4776 LIST_HEAD(list);
4777
4778 bond_destroy_sysfs(bn);
4779
4780 /* Kill off any bonds created after unregistering bond rtnl ops */
4781 rtnl_lock();
4782 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4783 unregister_netdevice_queue(bond->dev, &list);
4784 unregister_netdevice_many(&list);
4785 rtnl_unlock();
4786
4787 bond_destroy_proc_dir(bn);
4788 }
4789
4790 static struct pernet_operations bond_net_ops = {
4791 .init = bond_net_init,
4792 .exit = bond_net_exit,
4793 .id = &bond_net_id,
4794 .size = sizeof(struct bond_net),
4795 };
4796
4797 static int __init bonding_init(void)
4798 {
4799 int i;
4800 int res;
4801
4802 pr_info("%s", bond_version);
4803
4804 res = bond_check_params(&bonding_defaults);
4805 if (res)
4806 goto out;
4807
4808 res = register_pernet_subsys(&bond_net_ops);
4809 if (res)
4810 goto out;
4811
4812 res = bond_netlink_init();
4813 if (res)
4814 goto err_link;
4815
4816 bond_create_debugfs();
4817
4818 for (i = 0; i < max_bonds; i++) {
4819 res = bond_create(&init_net, NULL);
4820 if (res)
4821 goto err;
4822 }
4823
4824 register_netdevice_notifier(&bond_netdev_notifier);
4825 out:
4826 return res;
4827 err:
4828 bond_destroy_debugfs();
4829 bond_netlink_fini();
4830 err_link:
4831 unregister_pernet_subsys(&bond_net_ops);
4832 goto out;
4833
4834 }
4835
4836 static void __exit bonding_exit(void)
4837 {
4838 unregister_netdevice_notifier(&bond_netdev_notifier);
4839
4840 bond_destroy_debugfs();
4841
4842 bond_netlink_fini();
4843 unregister_pernet_subsys(&bond_net_ops);
4844
4845 #ifdef CONFIG_NET_POLL_CONTROLLER
4846 /* Make sure we don't have an imbalance on our netpoll blocking */
4847 WARN_ON(atomic_read(&netpoll_block_tx));
4848 #endif
4849 }
4850
4851 module_init(bonding_init);
4852 module_exit(bonding_exit);
4853 MODULE_LICENSE("GPL");
4854 MODULE_VERSION(DRV_VERSION);
4855 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4856 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
Linux with added FPC-III support