?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
treewide: kzalloc() -> kcalloc()
[linux-2.6/btrfs-unstable.git] / drivers / net / bonding / bond_main.c
blob63e3844c5becf5e973e10fa2aa533f668ac8e30b
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-alb, balance-tlb, balance-xor, 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_set_queue_mapping(skb, 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 NETIF_F_GSO_UDP_L4;
1112 bond_dev->gso_max_segs = gso_max_segs;
1113 netif_set_gso_max_size(bond_dev, gso_max_size);
1114
1115 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1116 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1117 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1118 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1119
1120 netdev_change_features(bond_dev);
1121 }
1122
1123 static void bond_setup_by_slave(struct net_device *bond_dev,
1124 struct net_device *slave_dev)
1125 {
1126 bond_dev->header_ops = slave_dev->header_ops;
1127
1128 bond_dev->type = slave_dev->type;
1129 bond_dev->hard_header_len = slave_dev->hard_header_len;
1130 bond_dev->addr_len = slave_dev->addr_len;
1131
1132 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1133 slave_dev->addr_len);
1134 }
1135
1136 /* On bonding slaves other than the currently active slave, suppress
1137 * duplicates except for alb non-mcast/bcast.
1138 */
1139 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1140 struct slave *slave,
1141 struct bonding *bond)
1142 {
1143 if (bond_is_slave_inactive(slave)) {
1144 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1145 skb->pkt_type != PACKET_BROADCAST &&
1146 skb->pkt_type != PACKET_MULTICAST)
1147 return false;
1148 return true;
1149 }
1150 return false;
1151 }
1152
1153 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1154 {
1155 struct sk_buff *skb = *pskb;
1156 struct slave *slave;
1157 struct bonding *bond;
1158 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1159 struct slave *);
1160 int ret = RX_HANDLER_ANOTHER;
1161
1162 skb = skb_share_check(skb, GFP_ATOMIC);
1163 if (unlikely(!skb))
1164 return RX_HANDLER_CONSUMED;
1165
1166 *pskb = skb;
1167
1168 slave = bond_slave_get_rcu(skb->dev);
1169 bond = slave->bond;
1170
1171 recv_probe = READ_ONCE(bond->recv_probe);
1172 if (recv_probe) {
1173 ret = recv_probe(skb, bond, slave);
1174 if (ret == RX_HANDLER_CONSUMED) {
1175 consume_skb(skb);
1176 return ret;
1177 }
1178 }
1179
1180 /* don't change skb->dev for link-local packets */
1181 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1182 return RX_HANDLER_PASS;
1183 if (bond_should_deliver_exact_match(skb, slave, bond))
1184 return RX_HANDLER_EXACT;
1185
1186 skb->dev = bond->dev;
1187
1188 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1189 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1190 skb->pkt_type == PACKET_HOST) {
1191
1192 if (unlikely(skb_cow_head(skb,
1193 skb->data - skb_mac_header(skb)))) {
1194 kfree_skb(skb);
1195 return RX_HANDLER_CONSUMED;
1196 }
1197 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1198 bond->dev->addr_len);
1199 }
1200
1201 return ret;
1202 }
1203
1204 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1205 {
1206 switch (BOND_MODE(bond)) {
1207 case BOND_MODE_ROUNDROBIN:
1208 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1209 case BOND_MODE_ACTIVEBACKUP:
1210 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1211 case BOND_MODE_BROADCAST:
1212 return NETDEV_LAG_TX_TYPE_BROADCAST;
1213 case BOND_MODE_XOR:
1214 case BOND_MODE_8023AD:
1215 return NETDEV_LAG_TX_TYPE_HASH;
1216 default:
1217 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1218 }
1219 }
1220
1221 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1222 enum netdev_lag_tx_type type)
1223 {
1224 if (type != NETDEV_LAG_TX_TYPE_HASH)
1225 return NETDEV_LAG_HASH_NONE;
1226
1227 switch (bond->params.xmit_policy) {
1228 case BOND_XMIT_POLICY_LAYER2:
1229 return NETDEV_LAG_HASH_L2;
1230 case BOND_XMIT_POLICY_LAYER34:
1231 return NETDEV_LAG_HASH_L34;
1232 case BOND_XMIT_POLICY_LAYER23:
1233 return NETDEV_LAG_HASH_L23;
1234 case BOND_XMIT_POLICY_ENCAP23:
1235 return NETDEV_LAG_HASH_E23;
1236 case BOND_XMIT_POLICY_ENCAP34:
1237 return NETDEV_LAG_HASH_E34;
1238 default:
1239 return NETDEV_LAG_HASH_UNKNOWN;
1240 }
1241 }
1242
1243 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1244 struct netlink_ext_ack *extack)
1245 {
1246 struct netdev_lag_upper_info lag_upper_info;
1247 enum netdev_lag_tx_type type;
1248
1249 type = bond_lag_tx_type(bond);
1250 lag_upper_info.tx_type = type;
1251 lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1252
1253 return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1254 &lag_upper_info, extack);
1255 }
1256
1257 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1258 {
1259 netdev_upper_dev_unlink(slave->dev, bond->dev);
1260 slave->dev->flags &= ~IFF_SLAVE;
1261 }
1262
1263 static struct slave *bond_alloc_slave(struct bonding *bond)
1264 {
1265 struct slave *slave = NULL;
1266
1267 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1268 if (!slave)
1269 return NULL;
1270
1271 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1272 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1273 GFP_KERNEL);
1274 if (!SLAVE_AD_INFO(slave)) {
1275 kfree(slave);
1276 return NULL;
1277 }
1278 }
1279 return slave;
1280 }
1281
1282 static void bond_free_slave(struct slave *slave)
1283 {
1284 struct bonding *bond = bond_get_bond_by_slave(slave);
1285
1286 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1287 kfree(SLAVE_AD_INFO(slave));
1288
1289 kfree(slave);
1290 }
1291
1292 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1293 {
1294 info->bond_mode = BOND_MODE(bond);
1295 info->miimon = bond->params.miimon;
1296 info->num_slaves = bond->slave_cnt;
1297 }
1298
1299 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1300 {
1301 strcpy(info->slave_name, slave->dev->name);
1302 info->link = slave->link;
1303 info->state = bond_slave_state(slave);
1304 info->link_failure_count = slave->link_failure_count;
1305 }
1306
1307 static void bond_netdev_notify(struct net_device *dev,
1308 struct netdev_bonding_info *info)
1309 {
1310 rtnl_lock();
1311 netdev_bonding_info_change(dev, info);
1312 rtnl_unlock();
1313 }
1314
1315 static void bond_netdev_notify_work(struct work_struct *_work)
1316 {
1317 struct netdev_notify_work *w =
1318 container_of(_work, struct netdev_notify_work, work.work);
1319
1320 bond_netdev_notify(w->dev, &w->bonding_info);
1321 dev_put(w->dev);
1322 kfree(w);
1323 }
1324
1325 void bond_queue_slave_event(struct slave *slave)
1326 {
1327 struct bonding *bond = slave->bond;
1328 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1329
1330 if (!nnw)
1331 return;
1332
1333 dev_hold(slave->dev);
1334 nnw->dev = slave->dev;
1335 bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1336 bond_fill_ifbond(bond, &nnw->bonding_info.master);
1337 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1338
1339 queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1340 }
1341
1342 void bond_lower_state_changed(struct slave *slave)
1343 {
1344 struct netdev_lag_lower_state_info info;
1345
1346 info.link_up = slave->link == BOND_LINK_UP ||
1347 slave->link == BOND_LINK_FAIL;
1348 info.tx_enabled = bond_is_active_slave(slave);
1349 netdev_lower_state_changed(slave->dev, &info);
1350 }
1351
1352 /* enslave device <slave> to bond device <master> */
1353 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1354 struct netlink_ext_ack *extack)
1355 {
1356 struct bonding *bond = netdev_priv(bond_dev);
1357 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1358 struct slave *new_slave = NULL, *prev_slave;
1359 struct sockaddr_storage ss;
1360 int link_reporting;
1361 int res = 0, i;
1362
1363 if (!bond->params.use_carrier &&
1364 slave_dev->ethtool_ops->get_link == NULL &&
1365 slave_ops->ndo_do_ioctl == NULL) {
1366 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1367 slave_dev->name);
1368 }
1369
1370 /* already in-use? */
1371 if (netdev_is_rx_handler_busy(slave_dev)) {
1372 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1373 netdev_err(bond_dev,
1374 "Error: Device is in use and cannot be enslaved\n");
1375 return -EBUSY;
1376 }
1377
1378 if (bond_dev == slave_dev) {
1379 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1380 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1381 return -EPERM;
1382 }
1383
1384 /* vlan challenged mutual exclusion */
1385 /* no need to lock since we're protected by rtnl_lock */
1386 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1387 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1388 slave_dev->name);
1389 if (vlan_uses_dev(bond_dev)) {
1390 NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1391 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1392 slave_dev->name, bond_dev->name);
1393 return -EPERM;
1394 } else {
1395 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1396 slave_dev->name, slave_dev->name,
1397 bond_dev->name);
1398 }
1399 } else {
1400 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1401 slave_dev->name);
1402 }
1403
1404 /* Old ifenslave binaries are no longer supported. These can
1405 * be identified with moderate accuracy by the state of the slave:
1406 * the current ifenslave will set the interface down prior to
1407 * enslaving it; the old ifenslave will not.
1408 */
1409 if (slave_dev->flags & IFF_UP) {
1410 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1411 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1412 slave_dev->name);
1413 return -EPERM;
1414 }
1415
1416 /* set bonding device ether type by slave - bonding netdevices are
1417 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1418 * there is a need to override some of the type dependent attribs/funcs.
1419 *
1420 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1421 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1422 */
1423 if (!bond_has_slaves(bond)) {
1424 if (bond_dev->type != slave_dev->type) {
1425 netdev_dbg(bond_dev, "change device type from %d to %d\n",
1426 bond_dev->type, slave_dev->type);
1427
1428 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1429 bond_dev);
1430 res = notifier_to_errno(res);
1431 if (res) {
1432 netdev_err(bond_dev, "refused to change device type\n");
1433 return -EBUSY;
1434 }
1435
1436 /* Flush unicast and multicast addresses */
1437 dev_uc_flush(bond_dev);
1438 dev_mc_flush(bond_dev);
1439
1440 if (slave_dev->type != ARPHRD_ETHER)
1441 bond_setup_by_slave(bond_dev, slave_dev);
1442 else {
1443 ether_setup(bond_dev);
1444 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1445 }
1446
1447 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1448 bond_dev);
1449 }
1450 } else if (bond_dev->type != slave_dev->type) {
1451 NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1452 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1453 slave_dev->name, slave_dev->type, bond_dev->type);
1454 return -EINVAL;
1455 }
1456
1457 if (slave_dev->type == ARPHRD_INFINIBAND &&
1458 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1459 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1460 netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n",
1461 slave_dev->type);
1462 res = -EOPNOTSUPP;
1463 goto err_undo_flags;
1464 }
1465
1466 if (!slave_ops->ndo_set_mac_address ||
1467 slave_dev->type == ARPHRD_INFINIBAND) {
1468 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1469 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1470 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1471 if (!bond_has_slaves(bond)) {
1472 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1473 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1474 } else {
1475 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1476 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");
1477 res = -EOPNOTSUPP;
1478 goto err_undo_flags;
1479 }
1480 }
1481 }
1482
1483 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1484
1485 /* If this is the first slave, then we need to set the master's hardware
1486 * address to be the same as the slave's.
1487 */
1488 if (!bond_has_slaves(bond) &&
1489 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1490 bond_set_dev_addr(bond->dev, slave_dev);
1491
1492 new_slave = bond_alloc_slave(bond);
1493 if (!new_slave) {
1494 res = -ENOMEM;
1495 goto err_undo_flags;
1496 }
1497
1498 new_slave->bond = bond;
1499 new_slave->dev = slave_dev;
1500 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1501 * is set via sysfs or module option if desired.
1502 */
1503 new_slave->queue_id = 0;
1504
1505 /* Save slave's original mtu and then set it to match the bond */
1506 new_slave->original_mtu = slave_dev->mtu;
1507 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1508 if (res) {
1509 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1510 goto err_free;
1511 }
1512
1513 /* Save slave's original ("permanent") mac address for modes
1514 * that need it, and for restoring it upon release, and then
1515 * set it to the master's address
1516 */
1517 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1518 slave_dev->addr_len);
1519
1520 if (!bond->params.fail_over_mac ||
1521 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1522 /* Set slave to master's mac address. The application already
1523 * set the master's mac address to that of the first slave
1524 */
1525 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1526 ss.ss_family = slave_dev->type;
1527 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss);
1528 if (res) {
1529 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1530 goto err_restore_mtu;
1531 }
1532 }
1533
1534 /* set slave flag before open to prevent IPv6 addrconf */
1535 slave_dev->flags |= IFF_SLAVE;
1536
1537 /* open the slave since the application closed it */
1538 res = dev_open(slave_dev);
1539 if (res) {
1540 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1541 goto err_restore_mac;
1542 }
1543
1544 slave_dev->priv_flags |= IFF_BONDING;
1545 /* initialize slave stats */
1546 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1547
1548 if (bond_is_lb(bond)) {
1549 /* bond_alb_init_slave() must be called before all other stages since
1550 * it might fail and we do not want to have to undo everything
1551 */
1552 res = bond_alb_init_slave(bond, new_slave);
1553 if (res)
1554 goto err_close;
1555 }
1556
1557 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1558 if (res) {
1559 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1560 slave_dev->name);
1561 goto err_close;
1562 }
1563
1564 prev_slave = bond_last_slave(bond);
1565
1566 new_slave->delay = 0;
1567 new_slave->link_failure_count = 0;
1568
1569 if (bond_update_speed_duplex(new_slave) &&
1570 bond_needs_speed_duplex(bond))
1571 new_slave->link = BOND_LINK_DOWN;
1572
1573 new_slave->last_rx = jiffies -
1574 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1575 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1576 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1577
1578 if (bond->params.miimon && !bond->params.use_carrier) {
1579 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1580
1581 if ((link_reporting == -1) && !bond->params.arp_interval) {
1582 /* miimon is set but a bonded network driver
1583 * does not support ETHTOOL/MII and
1584 * arp_interval is not set. Note: if
1585 * use_carrier is enabled, we will never go
1586 * here (because netif_carrier is always
1587 * supported); thus, we don't need to change
1588 * the messages for netif_carrier.
1589 */
1590 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",
1591 slave_dev->name);
1592 } else if (link_reporting == -1) {
1593 /* unable get link status using mii/ethtool */
1594 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",
1595 slave_dev->name);
1596 }
1597 }
1598
1599 /* check for initial state */
1600 new_slave->link = BOND_LINK_NOCHANGE;
1601 if (bond->params.miimon) {
1602 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1603 if (bond->params.updelay) {
1604 bond_set_slave_link_state(new_slave,
1605 BOND_LINK_BACK,
1606 BOND_SLAVE_NOTIFY_NOW);
1607 new_slave->delay = bond->params.updelay;
1608 } else {
1609 bond_set_slave_link_state(new_slave,
1610 BOND_LINK_UP,
1611 BOND_SLAVE_NOTIFY_NOW);
1612 }
1613 } else {
1614 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1615 BOND_SLAVE_NOTIFY_NOW);
1616 }
1617 } else if (bond->params.arp_interval) {
1618 bond_set_slave_link_state(new_slave,
1619 (netif_carrier_ok(slave_dev) ?
1620 BOND_LINK_UP : BOND_LINK_DOWN),
1621 BOND_SLAVE_NOTIFY_NOW);
1622 } else {
1623 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1624 BOND_SLAVE_NOTIFY_NOW);
1625 }
1626
1627 if (new_slave->link != BOND_LINK_DOWN)
1628 new_slave->last_link_up = jiffies;
1629 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1630 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1631 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1632
1633 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1634 /* if there is a primary slave, remember it */
1635 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1636 rcu_assign_pointer(bond->primary_slave, new_slave);
1637 bond->force_primary = true;
1638 }
1639 }
1640
1641 switch (BOND_MODE(bond)) {
1642 case BOND_MODE_ACTIVEBACKUP:
1643 bond_set_slave_inactive_flags(new_slave,
1644 BOND_SLAVE_NOTIFY_NOW);
1645 break;
1646 case BOND_MODE_8023AD:
1647 /* in 802.3ad mode, the internal mechanism
1648 * will activate the slaves in the selected
1649 * aggregator
1650 */
1651 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1652 /* if this is the first slave */
1653 if (!prev_slave) {
1654 SLAVE_AD_INFO(new_slave)->id = 1;
1655 /* Initialize AD with the number of times that the AD timer is called in 1 second
1656 * can be called only after the mac address of the bond is set
1657 */
1658 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1659 } else {
1660 SLAVE_AD_INFO(new_slave)->id =
1661 SLAVE_AD_INFO(prev_slave)->id + 1;
1662 }
1663
1664 bond_3ad_bind_slave(new_slave);
1665 break;
1666 case BOND_MODE_TLB:
1667 case BOND_MODE_ALB:
1668 bond_set_active_slave(new_slave);
1669 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1670 break;
1671 default:
1672 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1673
1674 /* always active in trunk mode */
1675 bond_set_active_slave(new_slave);
1676
1677 /* In trunking mode there is little meaning to curr_active_slave
1678 * anyway (it holds no special properties of the bond device),
1679 * so we can change it without calling change_active_interface()
1680 */
1681 if (!rcu_access_pointer(bond->curr_active_slave) &&
1682 new_slave->link == BOND_LINK_UP)
1683 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1684
1685 break;
1686 } /* switch(bond_mode) */
1687
1688 #ifdef CONFIG_NET_POLL_CONTROLLER
1689 if (bond->dev->npinfo) {
1690 if (slave_enable_netpoll(new_slave)) {
1691 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1692 res = -EBUSY;
1693 goto err_detach;
1694 }
1695 }
1696 #endif
1697
1698 if (!(bond_dev->features & NETIF_F_LRO))
1699 dev_disable_lro(slave_dev);
1700
1701 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1702 new_slave);
1703 if (res) {
1704 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1705 goto err_detach;
1706 }
1707
1708 res = bond_master_upper_dev_link(bond, new_slave, extack);
1709 if (res) {
1710 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1711 goto err_unregister;
1712 }
1713
1714 res = bond_sysfs_slave_add(new_slave);
1715 if (res) {
1716 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1717 goto err_upper_unlink;
1718 }
1719
1720 /* If the mode uses primary, then the following is handled by
1721 * bond_change_active_slave().
1722 */
1723 if (!bond_uses_primary(bond)) {
1724 /* set promiscuity level to new slave */
1725 if (bond_dev->flags & IFF_PROMISC) {
1726 res = dev_set_promiscuity(slave_dev, 1);
1727 if (res)
1728 goto err_sysfs_del;
1729 }
1730
1731 /* set allmulti level to new slave */
1732 if (bond_dev->flags & IFF_ALLMULTI) {
1733 res = dev_set_allmulti(slave_dev, 1);
1734 if (res) {
1735 if (bond_dev->flags & IFF_PROMISC)
1736 dev_set_promiscuity(slave_dev, -1);
1737 goto err_sysfs_del;
1738 }
1739 }
1740
1741 netif_addr_lock_bh(bond_dev);
1742 dev_mc_sync_multiple(slave_dev, bond_dev);
1743 dev_uc_sync_multiple(slave_dev, bond_dev);
1744 netif_addr_unlock_bh(bond_dev);
1745
1746 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1747 /* add lacpdu mc addr to mc list */
1748 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1749
1750 dev_mc_add(slave_dev, lacpdu_multicast);
1751 }
1752 }
1753
1754 bond->slave_cnt++;
1755 bond_compute_features(bond);
1756 bond_set_carrier(bond);
1757
1758 if (bond_uses_primary(bond)) {
1759 block_netpoll_tx();
1760 bond_select_active_slave(bond);
1761 unblock_netpoll_tx();
1762 }
1763
1764 if (bond_mode_can_use_xmit_hash(bond))
1765 bond_update_slave_arr(bond, NULL);
1766
1767 bond->nest_level = dev_get_nest_level(bond_dev);
1768
1769 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1770 slave_dev->name,
1771 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1772 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1773
1774 /* enslave is successful */
1775 bond_queue_slave_event(new_slave);
1776 return 0;
1777
1778 /* Undo stages on error */
1779 err_sysfs_del:
1780 bond_sysfs_slave_del(new_slave);
1781
1782 err_upper_unlink:
1783 bond_upper_dev_unlink(bond, new_slave);
1784
1785 err_unregister:
1786 netdev_rx_handler_unregister(slave_dev);
1787
1788 err_detach:
1789 vlan_vids_del_by_dev(slave_dev, bond_dev);
1790 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1791 RCU_INIT_POINTER(bond->primary_slave, NULL);
1792 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1793 block_netpoll_tx();
1794 bond_change_active_slave(bond, NULL);
1795 bond_select_active_slave(bond);
1796 unblock_netpoll_tx();
1797 }
1798 /* either primary_slave or curr_active_slave might've changed */
1799 synchronize_rcu();
1800 slave_disable_netpoll(new_slave);
1801
1802 err_close:
1803 slave_dev->priv_flags &= ~IFF_BONDING;
1804 dev_close(slave_dev);
1805
1806 err_restore_mac:
1807 slave_dev->flags &= ~IFF_SLAVE;
1808 if (!bond->params.fail_over_mac ||
1809 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1810 /* XXX TODO - fom follow mode needs to change master's
1811 * MAC if this slave's MAC is in use by the bond, or at
1812 * least print a warning.
1813 */
1814 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
1815 new_slave->dev->addr_len);
1816 ss.ss_family = slave_dev->type;
1817 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss);
1818 }
1819
1820 err_restore_mtu:
1821 dev_set_mtu(slave_dev, new_slave->original_mtu);
1822
1823 err_free:
1824 bond_free_slave(new_slave);
1825
1826 err_undo_flags:
1827 /* Enslave of first slave has failed and we need to fix master's mac */
1828 if (!bond_has_slaves(bond)) {
1829 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1830 slave_dev->dev_addr))
1831 eth_hw_addr_random(bond_dev);
1832 if (bond_dev->type != ARPHRD_ETHER) {
1833 dev_close(bond_dev);
1834 ether_setup(bond_dev);
1835 bond_dev->flags |= IFF_MASTER;
1836 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1837 }
1838 }
1839
1840 return res;
1841 }
1842
1843 /* Try to release the slave device <slave> from the bond device <master>
1844 * It is legal to access curr_active_slave without a lock because all the function
1845 * is RTNL-locked. If "all" is true it means that the function is being called
1846 * while destroying a bond interface and all slaves are being released.
1847 *
1848 * The rules for slave state should be:
1849 * for Active/Backup:
1850 * Active stays on all backups go down
1851 * for Bonded connections:
1852 * The first up interface should be left on and all others downed.
1853 */
1854 static int __bond_release_one(struct net_device *bond_dev,
1855 struct net_device *slave_dev,
1856 bool all, bool unregister)
1857 {
1858 struct bonding *bond = netdev_priv(bond_dev);
1859 struct slave *slave, *oldcurrent;
1860 struct sockaddr_storage ss;
1861 int old_flags = bond_dev->flags;
1862 netdev_features_t old_features = bond_dev->features;
1863
1864 /* slave is not a slave or master is not master of this slave */
1865 if (!(slave_dev->flags & IFF_SLAVE) ||
1866 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1867 netdev_dbg(bond_dev, "cannot release %s\n",
1868 slave_dev->name);
1869 return -EINVAL;
1870 }
1871
1872 block_netpoll_tx();
1873
1874 slave = bond_get_slave_by_dev(bond, slave_dev);
1875 if (!slave) {
1876 /* not a slave of this bond */
1877 netdev_info(bond_dev, "%s not enslaved\n",
1878 slave_dev->name);
1879 unblock_netpoll_tx();
1880 return -EINVAL;
1881 }
1882
1883 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1884
1885 bond_sysfs_slave_del(slave);
1886
1887 /* recompute stats just before removing the slave */
1888 bond_get_stats(bond->dev, &bond->bond_stats);
1889
1890 bond_upper_dev_unlink(bond, slave);
1891 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1892 * for this slave anymore.
1893 */
1894 netdev_rx_handler_unregister(slave_dev);
1895
1896 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1897 bond_3ad_unbind_slave(slave);
1898
1899 if (bond_mode_can_use_xmit_hash(bond))
1900 bond_update_slave_arr(bond, slave);
1901
1902 netdev_info(bond_dev, "Releasing %s interface %s\n",
1903 bond_is_active_slave(slave) ? "active" : "backup",
1904 slave_dev->name);
1905
1906 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1907
1908 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1909
1910 if (!all && (!bond->params.fail_over_mac ||
1911 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1912 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1913 bond_has_slaves(bond))
1914 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",
1915 slave_dev->name, slave->perm_hwaddr,
1916 bond_dev->name, slave_dev->name);
1917 }
1918
1919 if (rtnl_dereference(bond->primary_slave) == slave)
1920 RCU_INIT_POINTER(bond->primary_slave, NULL);
1921
1922 if (oldcurrent == slave)
1923 bond_change_active_slave(bond, NULL);
1924
1925 if (bond_is_lb(bond)) {
1926 /* Must be called only after the slave has been
1927 * detached from the list and the curr_active_slave
1928 * has been cleared (if our_slave == old_current),
1929 * but before a new active slave is selected.
1930 */
1931 bond_alb_deinit_slave(bond, slave);
1932 }
1933
1934 if (all) {
1935 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1936 } else if (oldcurrent == slave) {
1937 /* Note that we hold RTNL over this sequence, so there
1938 * is no concern that another slave add/remove event
1939 * will interfere.
1940 */
1941 bond_select_active_slave(bond);
1942 }
1943
1944 if (!bond_has_slaves(bond)) {
1945 bond_set_carrier(bond);
1946 eth_hw_addr_random(bond_dev);
1947 }
1948
1949 unblock_netpoll_tx();
1950 synchronize_rcu();
1951 bond->slave_cnt--;
1952
1953 if (!bond_has_slaves(bond)) {
1954 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1955 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1956 }
1957
1958 bond_compute_features(bond);
1959 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1960 (old_features & NETIF_F_VLAN_CHALLENGED))
1961 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1962 slave_dev->name, bond_dev->name);
1963
1964 vlan_vids_del_by_dev(slave_dev, bond_dev);
1965
1966 /* If the mode uses primary, then this case was handled above by
1967 * bond_change_active_slave(..., NULL)
1968 */
1969 if (!bond_uses_primary(bond)) {
1970 /* unset promiscuity level from slave
1971 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1972 * of the IFF_PROMISC flag in the bond_dev, but we need the
1973 * value of that flag before that change, as that was the value
1974 * when this slave was attached, so we cache at the start of the
1975 * function and use it here. Same goes for ALLMULTI below
1976 */
1977 if (old_flags & IFF_PROMISC)
1978 dev_set_promiscuity(slave_dev, -1);
1979
1980 /* unset allmulti level from slave */
1981 if (old_flags & IFF_ALLMULTI)
1982 dev_set_allmulti(slave_dev, -1);
1983
1984 bond_hw_addr_flush(bond_dev, slave_dev);
1985 }
1986
1987 slave_disable_netpoll(slave);
1988
1989 /* close slave before restoring its mac address */
1990 dev_close(slave_dev);
1991
1992 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1993 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1994 /* restore original ("permanent") mac address */
1995 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
1996 slave->dev->addr_len);
1997 ss.ss_family = slave_dev->type;
1998 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss);
1999 }
2000
2001 if (unregister)
2002 __dev_set_mtu(slave_dev, slave->original_mtu);
2003 else
2004 dev_set_mtu(slave_dev, slave->original_mtu);
2005
2006 slave_dev->priv_flags &= ~IFF_BONDING;
2007
2008 bond_free_slave(slave);
2009
2010 return 0;
2011 }
2012
2013 /* A wrapper used because of ndo_del_link */
2014 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2015 {
2016 return __bond_release_one(bond_dev, slave_dev, false, false);
2017 }
2018
2019 /* First release a slave and then destroy the bond if no more slaves are left.
2020 * Must be under rtnl_lock when this function is called.
2021 */
2022 static int bond_release_and_destroy(struct net_device *bond_dev,
2023 struct net_device *slave_dev)
2024 {
2025 struct bonding *bond = netdev_priv(bond_dev);
2026 int ret;
2027
2028 ret = __bond_release_one(bond_dev, slave_dev, false, true);
2029 if (ret == 0 && !bond_has_slaves(bond)) {
2030 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2031 netdev_info(bond_dev, "Destroying bond %s\n",
2032 bond_dev->name);
2033 bond_remove_proc_entry(bond);
2034 unregister_netdevice(bond_dev);
2035 }
2036 return ret;
2037 }
2038
2039 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2040 {
2041 struct bonding *bond = netdev_priv(bond_dev);
2042 bond_fill_ifbond(bond, info);
2043 }
2044
2045 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2046 {
2047 struct bonding *bond = netdev_priv(bond_dev);
2048 struct list_head *iter;
2049 int i = 0, res = -ENODEV;
2050 struct slave *slave;
2051
2052 bond_for_each_slave(bond, slave, iter) {
2053 if (i++ == (int)info->slave_id) {
2054 res = 0;
2055 bond_fill_ifslave(slave, info);
2056 break;
2057 }
2058 }
2059
2060 return res;
2061 }
2062
2063 /*-------------------------------- Monitoring -------------------------------*/
2064
2065 /* called with rcu_read_lock() */
2066 static int bond_miimon_inspect(struct bonding *bond)
2067 {
2068 int link_state, commit = 0;
2069 struct list_head *iter;
2070 struct slave *slave;
2071 bool ignore_updelay;
2072
2073 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2074
2075 bond_for_each_slave_rcu(bond, slave, iter) {
2076 slave->new_link = BOND_LINK_NOCHANGE;
2077 slave->link_new_state = slave->link;
2078
2079 link_state = bond_check_dev_link(bond, slave->dev, 0);
2080
2081 switch (slave->link) {
2082 case BOND_LINK_UP:
2083 if (link_state)
2084 continue;
2085
2086 bond_propose_link_state(slave, BOND_LINK_FAIL);
2087 commit++;
2088 slave->delay = bond->params.downdelay;
2089 if (slave->delay) {
2090 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2091 (BOND_MODE(bond) ==
2092 BOND_MODE_ACTIVEBACKUP) ?
2093 (bond_is_active_slave(slave) ?
2094 "active " : "backup ") : "",
2095 slave->dev->name,
2096 bond->params.downdelay * bond->params.miimon);
2097 }
2098 /*FALLTHRU*/
2099 case BOND_LINK_FAIL:
2100 if (link_state) {
2101 /* recovered before downdelay expired */
2102 bond_propose_link_state(slave, BOND_LINK_UP);
2103 slave->last_link_up = jiffies;
2104 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2105 (bond->params.downdelay - slave->delay) *
2106 bond->params.miimon,
2107 slave->dev->name);
2108 commit++;
2109 continue;
2110 }
2111
2112 if (slave->delay <= 0) {
2113 slave->new_link = BOND_LINK_DOWN;
2114 commit++;
2115 continue;
2116 }
2117
2118 slave->delay--;
2119 break;
2120
2121 case BOND_LINK_DOWN:
2122 if (!link_state)
2123 continue;
2124
2125 bond_propose_link_state(slave, BOND_LINK_BACK);
2126 commit++;
2127 slave->delay = bond->params.updelay;
2128
2129 if (slave->delay) {
2130 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2131 slave->dev->name,
2132 ignore_updelay ? 0 :
2133 bond->params.updelay *
2134 bond->params.miimon);
2135 }
2136 /*FALLTHRU*/
2137 case BOND_LINK_BACK:
2138 if (!link_state) {
2139 bond_propose_link_state(slave, BOND_LINK_DOWN);
2140 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2141 (bond->params.updelay - slave->delay) *
2142 bond->params.miimon,
2143 slave->dev->name);
2144 commit++;
2145 continue;
2146 }
2147
2148 if (ignore_updelay)
2149 slave->delay = 0;
2150
2151 if (slave->delay <= 0) {
2152 slave->new_link = BOND_LINK_UP;
2153 commit++;
2154 ignore_updelay = false;
2155 continue;
2156 }
2157
2158 slave->delay--;
2159 break;
2160 }
2161 }
2162
2163 return commit;
2164 }
2165
2166 static void bond_miimon_link_change(struct bonding *bond,
2167 struct slave *slave,
2168 char link)
2169 {
2170 switch (BOND_MODE(bond)) {
2171 case BOND_MODE_8023AD:
2172 bond_3ad_handle_link_change(slave, link);
2173 break;
2174 case BOND_MODE_TLB:
2175 case BOND_MODE_ALB:
2176 bond_alb_handle_link_change(bond, slave, link);
2177 break;
2178 case BOND_MODE_XOR:
2179 bond_update_slave_arr(bond, NULL);
2180 break;
2181 }
2182 }
2183
2184 static void bond_miimon_commit(struct bonding *bond)
2185 {
2186 struct list_head *iter;
2187 struct slave *slave, *primary;
2188
2189 bond_for_each_slave(bond, slave, iter) {
2190 switch (slave->new_link) {
2191 case BOND_LINK_NOCHANGE:
2192 continue;
2193
2194 case BOND_LINK_UP:
2195 if (bond_update_speed_duplex(slave) &&
2196 bond_needs_speed_duplex(bond)) {
2197 slave->link = BOND_LINK_DOWN;
2198 if (net_ratelimit())
2199 netdev_warn(bond->dev,
2200 "failed to get link speed/duplex for %s\n",
2201 slave->dev->name);
2202 continue;
2203 }
2204 bond_set_slave_link_state(slave, BOND_LINK_UP,
2205 BOND_SLAVE_NOTIFY_NOW);
2206 slave->last_link_up = jiffies;
2207
2208 primary = rtnl_dereference(bond->primary_slave);
2209 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2210 /* prevent it from being the active one */
2211 bond_set_backup_slave(slave);
2212 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2213 /* make it immediately active */
2214 bond_set_active_slave(slave);
2215 } else if (slave != primary) {
2216 /* prevent it from being the active one */
2217 bond_set_backup_slave(slave);
2218 }
2219
2220 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2221 slave->dev->name,
2222 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2223 slave->duplex ? "full" : "half");
2224
2225 bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2226
2227 if (!bond->curr_active_slave || slave == primary)
2228 goto do_failover;
2229
2230 continue;
2231
2232 case BOND_LINK_DOWN:
2233 if (slave->link_failure_count < UINT_MAX)
2234 slave->link_failure_count++;
2235
2236 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2237 BOND_SLAVE_NOTIFY_NOW);
2238
2239 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2240 BOND_MODE(bond) == BOND_MODE_8023AD)
2241 bond_set_slave_inactive_flags(slave,
2242 BOND_SLAVE_NOTIFY_NOW);
2243
2244 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2245 slave->dev->name);
2246
2247 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2248
2249 if (slave == rcu_access_pointer(bond->curr_active_slave))
2250 goto do_failover;
2251
2252 continue;
2253
2254 default:
2255 netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2256 slave->new_link, slave->dev->name);
2257 slave->new_link = BOND_LINK_NOCHANGE;
2258
2259 continue;
2260 }
2261
2262 do_failover:
2263 block_netpoll_tx();
2264 bond_select_active_slave(bond);
2265 unblock_netpoll_tx();
2266 }
2267
2268 bond_set_carrier(bond);
2269 }
2270
2271 /* bond_mii_monitor
2272 *
2273 * Really a wrapper that splits the mii monitor into two phases: an
2274 * inspection, then (if inspection indicates something needs to be done)
2275 * an acquisition of appropriate locks followed by a commit phase to
2276 * implement whatever link state changes are indicated.
2277 */
2278 static void bond_mii_monitor(struct work_struct *work)
2279 {
2280 struct bonding *bond = container_of(work, struct bonding,
2281 mii_work.work);
2282 bool should_notify_peers = false;
2283 unsigned long delay;
2284 struct slave *slave;
2285 struct list_head *iter;
2286
2287 delay = msecs_to_jiffies(bond->params.miimon);
2288
2289 if (!bond_has_slaves(bond))
2290 goto re_arm;
2291
2292 rcu_read_lock();
2293
2294 should_notify_peers = bond_should_notify_peers(bond);
2295
2296 if (bond_miimon_inspect(bond)) {
2297 rcu_read_unlock();
2298
2299 /* Race avoidance with bond_close cancel of workqueue */
2300 if (!rtnl_trylock()) {
2301 delay = 1;
2302 should_notify_peers = false;
2303 goto re_arm;
2304 }
2305
2306 bond_for_each_slave(bond, slave, iter) {
2307 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2308 }
2309 bond_miimon_commit(bond);
2310
2311 rtnl_unlock(); /* might sleep, hold no other locks */
2312 } else
2313 rcu_read_unlock();
2314
2315 re_arm:
2316 if (bond->params.miimon)
2317 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2318
2319 if (should_notify_peers) {
2320 if (!rtnl_trylock())
2321 return;
2322 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2323 rtnl_unlock();
2324 }
2325 }
2326
2327 static int bond_upper_dev_walk(struct net_device *upper, void *data)
2328 {
2329 __be32 ip = *((__be32 *)data);
2330
2331 return ip == bond_confirm_addr(upper, 0, ip);
2332 }
2333
2334 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2335 {
2336 bool ret = false;
2337
2338 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2339 return true;
2340
2341 rcu_read_lock();
2342 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip))
2343 ret = true;
2344 rcu_read_unlock();
2345
2346 return ret;
2347 }
2348
2349 /* We go to the (large) trouble of VLAN tagging ARP frames because
2350 * switches in VLAN mode (especially if ports are configured as
2351 * "native" to a VLAN) might not pass non-tagged frames.
2352 */
2353 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2354 __be32 dest_ip, __be32 src_ip,
2355 struct bond_vlan_tag *tags)
2356 {
2357 struct sk_buff *skb;
2358 struct bond_vlan_tag *outer_tag = tags;
2359
2360 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2361 arp_op, slave_dev->name, &dest_ip, &src_ip);
2362
2363 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2364 NULL, slave_dev->dev_addr, NULL);
2365
2366 if (!skb) {
2367 net_err_ratelimited("ARP packet allocation failed\n");
2368 return;
2369 }
2370
2371 if (!tags || tags->vlan_proto == VLAN_N_VID)
2372 goto xmit;
2373
2374 tags++;
2375
2376 /* Go through all the tags backwards and add them to the packet */
2377 while (tags->vlan_proto != VLAN_N_VID) {
2378 if (!tags->vlan_id) {
2379 tags++;
2380 continue;
2381 }
2382
2383 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2384 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2385 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2386 tags->vlan_id);
2387 if (!skb) {
2388 net_err_ratelimited("failed to insert inner VLAN tag\n");
2389 return;
2390 }
2391
2392 tags++;
2393 }
2394 /* Set the outer tag */
2395 if (outer_tag->vlan_id) {
2396 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2397 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2398 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2399 outer_tag->vlan_id);
2400 }
2401
2402 xmit:
2403 arp_xmit(skb);
2404 }
2405
2406 /* Validate the device path between the @start_dev and the @end_dev.
2407 * The path is valid if the @end_dev is reachable through device
2408 * stacking.
2409 * When the path is validated, collect any vlan information in the
2410 * path.
2411 */
2412 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2413 struct net_device *end_dev,
2414 int level)
2415 {
2416 struct bond_vlan_tag *tags;
2417 struct net_device *upper;
2418 struct list_head *iter;
2419
2420 if (start_dev == end_dev) {
2421 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2422 if (!tags)
2423 return ERR_PTR(-ENOMEM);
2424 tags[level].vlan_proto = VLAN_N_VID;
2425 return tags;
2426 }
2427
2428 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2429 tags = bond_verify_device_path(upper, end_dev, level + 1);
2430 if (IS_ERR_OR_NULL(tags)) {
2431 if (IS_ERR(tags))
2432 return tags;
2433 continue;
2434 }
2435 if (is_vlan_dev(upper)) {
2436 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2437 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2438 }
2439
2440 return tags;
2441 }
2442
2443 return NULL;
2444 }
2445
2446 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2447 {
2448 struct rtable *rt;
2449 struct bond_vlan_tag *tags;
2450 __be32 *targets = bond->params.arp_targets, addr;
2451 int i;
2452
2453 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2454 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2455 tags = NULL;
2456
2457 /* Find out through which dev should the packet go */
2458 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2459 RTO_ONLINK, 0);
2460 if (IS_ERR(rt)) {
2461 /* there's no route to target - try to send arp
2462 * probe to generate any traffic (arp_validate=0)
2463 */
2464 if (bond->params.arp_validate)
2465 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2466 bond->dev->name,
2467 &targets[i]);
2468 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2469 0, tags);
2470 continue;
2471 }
2472
2473 /* bond device itself */
2474 if (rt->dst.dev == bond->dev)
2475 goto found;
2476
2477 rcu_read_lock();
2478 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2479 rcu_read_unlock();
2480
2481 if (!IS_ERR_OR_NULL(tags))
2482 goto found;
2483
2484 /* Not our device - skip */
2485 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2486 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2487
2488 ip_rt_put(rt);
2489 continue;
2490
2491 found:
2492 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2493 ip_rt_put(rt);
2494 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2495 addr, tags);
2496 kfree(tags);
2497 }
2498 }
2499
2500 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2501 {
2502 int i;
2503
2504 if (!sip || !bond_has_this_ip(bond, tip)) {
2505 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2506 &sip, &tip);
2507 return;
2508 }
2509
2510 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2511 if (i == -1) {
2512 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2513 &sip);
2514 return;
2515 }
2516 slave->last_rx = jiffies;
2517 slave->target_last_arp_rx[i] = jiffies;
2518 }
2519
2520 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2521 struct slave *slave)
2522 {
2523 struct arphdr *arp = (struct arphdr *)skb->data;
2524 struct slave *curr_active_slave, *curr_arp_slave;
2525 unsigned char *arp_ptr;
2526 __be32 sip, tip;
2527 int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2528 unsigned int alen;
2529
2530 if (!slave_do_arp_validate(bond, slave)) {
2531 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2532 !slave_do_arp_validate_only(bond))
2533 slave->last_rx = jiffies;
2534 return RX_HANDLER_ANOTHER;
2535 } else if (!is_arp) {
2536 return RX_HANDLER_ANOTHER;
2537 }
2538
2539 alen = arp_hdr_len(bond->dev);
2540
2541 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2542 skb->dev->name);
2543
2544 if (alen > skb_headlen(skb)) {
2545 arp = kmalloc(alen, GFP_ATOMIC);
2546 if (!arp)
2547 goto out_unlock;
2548 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2549 goto out_unlock;
2550 }
2551
2552 if (arp->ar_hln != bond->dev->addr_len ||
2553 skb->pkt_type == PACKET_OTHERHOST ||
2554 skb->pkt_type == PACKET_LOOPBACK ||
2555 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2556 arp->ar_pro != htons(ETH_P_IP) ||
2557 arp->ar_pln != 4)
2558 goto out_unlock;
2559
2560 arp_ptr = (unsigned char *)(arp + 1);
2561 arp_ptr += bond->dev->addr_len;
2562 memcpy(&sip, arp_ptr, 4);
2563 arp_ptr += 4 + bond->dev->addr_len;
2564 memcpy(&tip, arp_ptr, 4);
2565
2566 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2567 slave->dev->name, bond_slave_state(slave),
2568 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2569 &sip, &tip);
2570
2571 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2572 curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2573
2574 /* We 'trust' the received ARP enough to validate it if:
2575 *
2576 * (a) the slave receiving the ARP is active (which includes the
2577 * current ARP slave, if any), or
2578 *
2579 * (b) the receiving slave isn't active, but there is a currently
2580 * active slave and it received valid arp reply(s) after it became
2581 * the currently active slave, or
2582 *
2583 * (c) there is an ARP slave that sent an ARP during the prior ARP
2584 * interval, and we receive an ARP reply on any slave. We accept
2585 * these because switch FDB update delays may deliver the ARP
2586 * reply to a slave other than the sender of the ARP request.
2587 *
2588 * Note: for (b), backup slaves are receiving the broadcast ARP
2589 * request, not a reply. This request passes from the sending
2590 * slave through the L2 switch(es) to the receiving slave. Since
2591 * this is checking the request, sip/tip are swapped for
2592 * validation.
2593 *
2594 * This is done to avoid endless looping when we can't reach the
2595 * arp_ip_target and fool ourselves with our own arp requests.
2596 */
2597 if (bond_is_active_slave(slave))
2598 bond_validate_arp(bond, slave, sip, tip);
2599 else if (curr_active_slave &&
2600 time_after(slave_last_rx(bond, curr_active_slave),
2601 curr_active_slave->last_link_up))
2602 bond_validate_arp(bond, slave, tip, sip);
2603 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2604 bond_time_in_interval(bond,
2605 dev_trans_start(curr_arp_slave->dev), 1))
2606 bond_validate_arp(bond, slave, sip, tip);
2607
2608 out_unlock:
2609 if (arp != (struct arphdr *)skb->data)
2610 kfree(arp);
2611 return RX_HANDLER_ANOTHER;
2612 }
2613
2614 /* function to verify if we're in the arp_interval timeslice, returns true if
2615 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2616 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2617 */
2618 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2619 int mod)
2620 {
2621 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2622
2623 return time_in_range(jiffies,
2624 last_act - delta_in_ticks,
2625 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2626 }
2627
2628 /* This function is called regularly to monitor each slave's link
2629 * ensuring that traffic is being sent and received when arp monitoring
2630 * is used in load-balancing mode. if the adapter has been dormant, then an
2631 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2632 * arp monitoring in active backup mode.
2633 */
2634 static void bond_loadbalance_arp_mon(struct bonding *bond)
2635 {
2636 struct slave *slave, *oldcurrent;
2637 struct list_head *iter;
2638 int do_failover = 0, slave_state_changed = 0;
2639
2640 if (!bond_has_slaves(bond))
2641 goto re_arm;
2642
2643 rcu_read_lock();
2644
2645 oldcurrent = rcu_dereference(bond->curr_active_slave);
2646 /* see if any of the previous devices are up now (i.e. they have
2647 * xmt and rcv traffic). the curr_active_slave does not come into
2648 * the picture unless it is null. also, slave->last_link_up is not
2649 * needed here because we send an arp on each slave and give a slave
2650 * as long as it needs to get the tx/rx within the delta.
2651 * TODO: what about up/down delay in arp mode? it wasn't here before
2652 * so it can wait
2653 */
2654 bond_for_each_slave_rcu(bond, slave, iter) {
2655 unsigned long trans_start = dev_trans_start(slave->dev);
2656
2657 slave->new_link = BOND_LINK_NOCHANGE;
2658
2659 if (slave->link != BOND_LINK_UP) {
2660 if (bond_time_in_interval(bond, trans_start, 1) &&
2661 bond_time_in_interval(bond, slave->last_rx, 1)) {
2662
2663 slave->new_link = BOND_LINK_UP;
2664 slave_state_changed = 1;
2665
2666 /* primary_slave has no meaning in round-robin
2667 * mode. the window of a slave being up and
2668 * curr_active_slave being null after enslaving
2669 * is closed.
2670 */
2671 if (!oldcurrent) {
2672 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2673 slave->dev->name);
2674 do_failover = 1;
2675 } else {
2676 netdev_info(bond->dev, "interface %s is now up\n",
2677 slave->dev->name);
2678 }
2679 }
2680 } else {
2681 /* slave->link == BOND_LINK_UP */
2682
2683 /* not all switches will respond to an arp request
2684 * when the source ip is 0, so don't take the link down
2685 * if we don't know our ip yet
2686 */
2687 if (!bond_time_in_interval(bond, trans_start, 2) ||
2688 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2689
2690 slave->new_link = BOND_LINK_DOWN;
2691 slave_state_changed = 1;
2692
2693 if (slave->link_failure_count < UINT_MAX)
2694 slave->link_failure_count++;
2695
2696 netdev_info(bond->dev, "interface %s is now down\n",
2697 slave->dev->name);
2698
2699 if (slave == oldcurrent)
2700 do_failover = 1;
2701 }
2702 }
2703
2704 /* note: if switch is in round-robin mode, all links
2705 * must tx arp to ensure all links rx an arp - otherwise
2706 * links may oscillate or not come up at all; if switch is
2707 * in something like xor mode, there is nothing we can
2708 * do - all replies will be rx'ed on same link causing slaves
2709 * to be unstable during low/no traffic periods
2710 */
2711 if (bond_slave_is_up(slave))
2712 bond_arp_send_all(bond, slave);
2713 }
2714
2715 rcu_read_unlock();
2716
2717 if (do_failover || slave_state_changed) {
2718 if (!rtnl_trylock())
2719 goto re_arm;
2720
2721 bond_for_each_slave(bond, slave, iter) {
2722 if (slave->new_link != BOND_LINK_NOCHANGE)
2723 slave->link = slave->new_link;
2724 }
2725
2726 if (slave_state_changed) {
2727 bond_slave_state_change(bond);
2728 if (BOND_MODE(bond) == BOND_MODE_XOR)
2729 bond_update_slave_arr(bond, NULL);
2730 }
2731 if (do_failover) {
2732 block_netpoll_tx();
2733 bond_select_active_slave(bond);
2734 unblock_netpoll_tx();
2735 }
2736 rtnl_unlock();
2737 }
2738
2739 re_arm:
2740 if (bond->params.arp_interval)
2741 queue_delayed_work(bond->wq, &bond->arp_work,
2742 msecs_to_jiffies(bond->params.arp_interval));
2743 }
2744
2745 /* Called to inspect slaves for active-backup mode ARP monitor link state
2746 * changes. Sets new_link in slaves to specify what action should take
2747 * place for the slave. Returns 0 if no changes are found, >0 if changes
2748 * to link states must be committed.
2749 *
2750 * Called with rcu_read_lock held.
2751 */
2752 static int bond_ab_arp_inspect(struct bonding *bond)
2753 {
2754 unsigned long trans_start, last_rx;
2755 struct list_head *iter;
2756 struct slave *slave;
2757 int commit = 0;
2758
2759 bond_for_each_slave_rcu(bond, slave, iter) {
2760 slave->new_link = BOND_LINK_NOCHANGE;
2761 last_rx = slave_last_rx(bond, slave);
2762
2763 if (slave->link != BOND_LINK_UP) {
2764 if (bond_time_in_interval(bond, last_rx, 1)) {
2765 slave->new_link = BOND_LINK_UP;
2766 commit++;
2767 }
2768 continue;
2769 }
2770
2771 /* Give slaves 2*delta after being enslaved or made
2772 * active. This avoids bouncing, as the last receive
2773 * times need a full ARP monitor cycle to be updated.
2774 */
2775 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2776 continue;
2777
2778 /* Backup slave is down if:
2779 * - No current_arp_slave AND
2780 * - more than 3*delta since last receive AND
2781 * - the bond has an IP address
2782 *
2783 * Note: a non-null current_arp_slave indicates
2784 * the curr_active_slave went down and we are
2785 * searching for a new one; under this condition
2786 * we only take the curr_active_slave down - this
2787 * gives each slave a chance to tx/rx traffic
2788 * before being taken out
2789 */
2790 if (!bond_is_active_slave(slave) &&
2791 !rcu_access_pointer(bond->current_arp_slave) &&
2792 !bond_time_in_interval(bond, last_rx, 3)) {
2793 slave->new_link = BOND_LINK_DOWN;
2794 commit++;
2795 }
2796
2797 /* Active slave is down if:
2798 * - more than 2*delta since transmitting OR
2799 * - (more than 2*delta since receive AND
2800 * the bond has an IP address)
2801 */
2802 trans_start = dev_trans_start(slave->dev);
2803 if (bond_is_active_slave(slave) &&
2804 (!bond_time_in_interval(bond, trans_start, 2) ||
2805 !bond_time_in_interval(bond, last_rx, 2))) {
2806 slave->new_link = BOND_LINK_DOWN;
2807 commit++;
2808 }
2809 }
2810
2811 return commit;
2812 }
2813
2814 /* Called to commit link state changes noted by inspection step of
2815 * active-backup mode ARP monitor.
2816 *
2817 * Called with RTNL hold.
2818 */
2819 static void bond_ab_arp_commit(struct bonding *bond)
2820 {
2821 unsigned long trans_start;
2822 struct list_head *iter;
2823 struct slave *slave;
2824
2825 bond_for_each_slave(bond, slave, iter) {
2826 switch (slave->new_link) {
2827 case BOND_LINK_NOCHANGE:
2828 continue;
2829
2830 case BOND_LINK_UP:
2831 trans_start = dev_trans_start(slave->dev);
2832 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2833 (!rtnl_dereference(bond->curr_active_slave) &&
2834 bond_time_in_interval(bond, trans_start, 1))) {
2835 struct slave *current_arp_slave;
2836
2837 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2838 bond_set_slave_link_state(slave, BOND_LINK_UP,
2839 BOND_SLAVE_NOTIFY_NOW);
2840 if (current_arp_slave) {
2841 bond_set_slave_inactive_flags(
2842 current_arp_slave,
2843 BOND_SLAVE_NOTIFY_NOW);
2844 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2845 }
2846
2847 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2848 slave->dev->name);
2849
2850 if (!rtnl_dereference(bond->curr_active_slave) ||
2851 slave == rtnl_dereference(bond->primary_slave))
2852 goto do_failover;
2853
2854 }
2855
2856 continue;
2857
2858 case BOND_LINK_DOWN:
2859 if (slave->link_failure_count < UINT_MAX)
2860 slave->link_failure_count++;
2861
2862 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2863 BOND_SLAVE_NOTIFY_NOW);
2864 bond_set_slave_inactive_flags(slave,
2865 BOND_SLAVE_NOTIFY_NOW);
2866
2867 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2868 slave->dev->name);
2869
2870 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2871 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2872 goto do_failover;
2873 }
2874
2875 continue;
2876
2877 default:
2878 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2879 slave->new_link, slave->dev->name);
2880 continue;
2881 }
2882
2883 do_failover:
2884 block_netpoll_tx();
2885 bond_select_active_slave(bond);
2886 unblock_netpoll_tx();
2887 }
2888
2889 bond_set_carrier(bond);
2890 }
2891
2892 /* Send ARP probes for active-backup mode ARP monitor.
2893 *
2894 * Called with rcu_read_lock held.
2895 */
2896 static bool bond_ab_arp_probe(struct bonding *bond)
2897 {
2898 struct slave *slave, *before = NULL, *new_slave = NULL,
2899 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2900 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2901 struct list_head *iter;
2902 bool found = false;
2903 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2904
2905 if (curr_arp_slave && curr_active_slave)
2906 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2907 curr_arp_slave->dev->name,
2908 curr_active_slave->dev->name);
2909
2910 if (curr_active_slave) {
2911 bond_arp_send_all(bond, curr_active_slave);
2912 return should_notify_rtnl;
2913 }
2914
2915 /* if we don't have a curr_active_slave, search for the next available
2916 * backup slave from the current_arp_slave and make it the candidate
2917 * for becoming the curr_active_slave
2918 */
2919
2920 if (!curr_arp_slave) {
2921 curr_arp_slave = bond_first_slave_rcu(bond);
2922 if (!curr_arp_slave)
2923 return should_notify_rtnl;
2924 }
2925
2926 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2927
2928 bond_for_each_slave_rcu(bond, slave, iter) {
2929 if (!found && !before && bond_slave_is_up(slave))
2930 before = slave;
2931
2932 if (found && !new_slave && bond_slave_is_up(slave))
2933 new_slave = slave;
2934 /* if the link state is up at this point, we
2935 * mark it down - this can happen if we have
2936 * simultaneous link failures and
2937 * reselect_active_interface doesn't make this
2938 * one the current slave so it is still marked
2939 * up when it is actually down
2940 */
2941 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2942 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2943 BOND_SLAVE_NOTIFY_LATER);
2944 if (slave->link_failure_count < UINT_MAX)
2945 slave->link_failure_count++;
2946
2947 bond_set_slave_inactive_flags(slave,
2948 BOND_SLAVE_NOTIFY_LATER);
2949
2950 netdev_info(bond->dev, "backup interface %s is now down\n",
2951 slave->dev->name);
2952 }
2953 if (slave == curr_arp_slave)
2954 found = true;
2955 }
2956
2957 if (!new_slave && before)
2958 new_slave = before;
2959
2960 if (!new_slave)
2961 goto check_state;
2962
2963 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2964 BOND_SLAVE_NOTIFY_LATER);
2965 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2966 bond_arp_send_all(bond, new_slave);
2967 new_slave->last_link_up = jiffies;
2968 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2969
2970 check_state:
2971 bond_for_each_slave_rcu(bond, slave, iter) {
2972 if (slave->should_notify || slave->should_notify_link) {
2973 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2974 break;
2975 }
2976 }
2977 return should_notify_rtnl;
2978 }
2979
2980 static void bond_activebackup_arp_mon(struct bonding *bond)
2981 {
2982 bool should_notify_peers = false;
2983 bool should_notify_rtnl = false;
2984 int delta_in_ticks;
2985
2986 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2987
2988 if (!bond_has_slaves(bond))
2989 goto re_arm;
2990
2991 rcu_read_lock();
2992
2993 should_notify_peers = bond_should_notify_peers(bond);
2994
2995 if (bond_ab_arp_inspect(bond)) {
2996 rcu_read_unlock();
2997
2998 /* Race avoidance with bond_close flush of workqueue */
2999 if (!rtnl_trylock()) {
3000 delta_in_ticks = 1;
3001 should_notify_peers = false;
3002 goto re_arm;
3003 }
3004
3005 bond_ab_arp_commit(bond);
3006
3007 rtnl_unlock();
3008 rcu_read_lock();
3009 }
3010
3011 should_notify_rtnl = bond_ab_arp_probe(bond);
3012 rcu_read_unlock();
3013
3014 re_arm:
3015 if (bond->params.arp_interval)
3016 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3017
3018 if (should_notify_peers || should_notify_rtnl) {
3019 if (!rtnl_trylock())
3020 return;
3021
3022 if (should_notify_peers)
3023 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3024 bond->dev);
3025 if (should_notify_rtnl) {
3026 bond_slave_state_notify(bond);
3027 bond_slave_link_notify(bond);
3028 }
3029
3030 rtnl_unlock();
3031 }
3032 }
3033
3034 static void bond_arp_monitor(struct work_struct *work)
3035 {
3036 struct bonding *bond = container_of(work, struct bonding,
3037 arp_work.work);
3038
3039 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3040 bond_activebackup_arp_mon(bond);
3041 else
3042 bond_loadbalance_arp_mon(bond);
3043 }
3044
3045 /*-------------------------- netdev event handling --------------------------*/
3046
3047 /* Change device name */
3048 static int bond_event_changename(struct bonding *bond)
3049 {
3050 bond_remove_proc_entry(bond);
3051 bond_create_proc_entry(bond);
3052
3053 bond_debug_reregister(bond);
3054
3055 return NOTIFY_DONE;
3056 }
3057
3058 static int bond_master_netdev_event(unsigned long event,
3059 struct net_device *bond_dev)
3060 {
3061 struct bonding *event_bond = netdev_priv(bond_dev);
3062
3063 switch (event) {
3064 case NETDEV_CHANGENAME:
3065 return bond_event_changename(event_bond);
3066 case NETDEV_UNREGISTER:
3067 bond_remove_proc_entry(event_bond);
3068 break;
3069 case NETDEV_REGISTER:
3070 bond_create_proc_entry(event_bond);
3071 break;
3072 case NETDEV_NOTIFY_PEERS:
3073 if (event_bond->send_peer_notif)
3074 event_bond->send_peer_notif--;
3075 break;
3076 default:
3077 break;
3078 }
3079
3080 return NOTIFY_DONE;
3081 }
3082
3083 static int bond_slave_netdev_event(unsigned long event,
3084 struct net_device *slave_dev)
3085 {
3086 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3087 struct bonding *bond;
3088 struct net_device *bond_dev;
3089
3090 /* A netdev event can be generated while enslaving a device
3091 * before netdev_rx_handler_register is called in which case
3092 * slave will be NULL
3093 */
3094 if (!slave)
3095 return NOTIFY_DONE;
3096 bond_dev = slave->bond->dev;
3097 bond = slave->bond;
3098 primary = rtnl_dereference(bond->primary_slave);
3099
3100 switch (event) {
3101 case NETDEV_UNREGISTER:
3102 if (bond_dev->type != ARPHRD_ETHER)
3103 bond_release_and_destroy(bond_dev, slave_dev);
3104 else
3105 __bond_release_one(bond_dev, slave_dev, false, true);
3106 break;
3107 case NETDEV_UP:
3108 case NETDEV_CHANGE:
3109 /* For 802.3ad mode only:
3110 * Getting invalid Speed/Duplex values here will put slave
3111 * in weird state. So mark it as link-down for the time
3112 * being and let link-monitoring (miimon) set it right when
3113 * correct speeds/duplex are available.
3114 */
3115 if (bond_update_speed_duplex(slave) &&
3116 BOND_MODE(bond) == BOND_MODE_8023AD)
3117 slave->link = BOND_LINK_DOWN;
3118
3119 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3120 bond_3ad_adapter_speed_duplex_changed(slave);
3121 /* Fallthrough */
3122 case NETDEV_DOWN:
3123 /* Refresh slave-array if applicable!
3124 * If the setup does not use miimon or arpmon (mode-specific!),
3125 * then these events will not cause the slave-array to be
3126 * refreshed. This will cause xmit to use a slave that is not
3127 * usable. Avoid such situation by refeshing the array at these
3128 * events. If these (miimon/arpmon) parameters are configured
3129 * then array gets refreshed twice and that should be fine!
3130 */
3131 if (bond_mode_can_use_xmit_hash(bond))
3132 bond_update_slave_arr(bond, NULL);
3133 break;
3134 case NETDEV_CHANGEMTU:
3135 /* TODO: Should slaves be allowed to
3136 * independently alter their MTU? For
3137 * an active-backup bond, slaves need
3138 * not be the same type of device, so
3139 * MTUs may vary. For other modes,
3140 * slaves arguably should have the
3141 * same MTUs. To do this, we'd need to
3142 * take over the slave's change_mtu
3143 * function for the duration of their
3144 * servitude.
3145 */
3146 break;
3147 case NETDEV_CHANGENAME:
3148 /* we don't care if we don't have primary set */
3149 if (!bond_uses_primary(bond) ||
3150 !bond->params.primary[0])
3151 break;
3152
3153 if (slave == primary) {
3154 /* slave's name changed - he's no longer primary */
3155 RCU_INIT_POINTER(bond->primary_slave, NULL);
3156 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3157 /* we have a new primary slave */
3158 rcu_assign_pointer(bond->primary_slave, slave);
3159 } else { /* we didn't change primary - exit */
3160 break;
3161 }
3162
3163 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3164 primary ? slave_dev->name : "none");
3165
3166 block_netpoll_tx();
3167 bond_select_active_slave(bond);
3168 unblock_netpoll_tx();
3169 break;
3170 case NETDEV_FEAT_CHANGE:
3171 bond_compute_features(bond);
3172 break;
3173 case NETDEV_RESEND_IGMP:
3174 /* Propagate to master device */
3175 call_netdevice_notifiers(event, slave->bond->dev);
3176 break;
3177 default:
3178 break;
3179 }
3180
3181 return NOTIFY_DONE;
3182 }
3183
3184 /* bond_netdev_event: handle netdev notifier chain events.
3185 *
3186 * This function receives events for the netdev chain. The caller (an
3187 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3188 * locks for us to safely manipulate the slave devices (RTNL lock,
3189 * dev_probe_lock).
3190 */
3191 static int bond_netdev_event(struct notifier_block *this,
3192 unsigned long event, void *ptr)
3193 {
3194 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3195
3196 netdev_dbg(event_dev, "event: %lx\n", event);
3197
3198 if (!(event_dev->priv_flags & IFF_BONDING))
3199 return NOTIFY_DONE;
3200
3201 if (event_dev->flags & IFF_MASTER) {
3202 netdev_dbg(event_dev, "IFF_MASTER\n");
3203 return bond_master_netdev_event(event, event_dev);
3204 }
3205
3206 if (event_dev->flags & IFF_SLAVE) {
3207 netdev_dbg(event_dev, "IFF_SLAVE\n");
3208 return bond_slave_netdev_event(event, event_dev);
3209 }
3210
3211 return NOTIFY_DONE;
3212 }
3213
3214 static struct notifier_block bond_netdev_notifier = {
3215 .notifier_call = bond_netdev_event,
3216 };
3217
3218 /*---------------------------- Hashing Policies -----------------------------*/
3219
3220 /* L2 hash helper */
3221 static inline u32 bond_eth_hash(struct sk_buff *skb)
3222 {
3223 struct ethhdr *ep, hdr_tmp;
3224
3225 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3226 if (ep)
3227 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3228 return 0;
3229 }
3230
3231 /* Extract the appropriate headers based on bond's xmit policy */
3232 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3233 struct flow_keys *fk)
3234 {
3235 const struct ipv6hdr *iph6;
3236 const struct iphdr *iph;
3237 int noff, proto = -1;
3238
3239 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3240 return skb_flow_dissect_flow_keys(skb, fk, 0);
3241
3242 fk->ports.ports = 0;
3243 noff = skb_network_offset(skb);
3244 if (skb->protocol == htons(ETH_P_IP)) {
3245 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3246 return false;
3247 iph = ip_hdr(skb);
3248 iph_to_flow_copy_v4addrs(fk, iph);
3249 noff += iph->ihl << 2;
3250 if (!ip_is_fragment(iph))
3251 proto = iph->protocol;
3252 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3253 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3254 return false;
3255 iph6 = ipv6_hdr(skb);
3256 iph_to_flow_copy_v6addrs(fk, iph6);
3257 noff += sizeof(*iph6);
3258 proto = iph6->nexthdr;
3259 } else {
3260 return false;
3261 }
3262 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3263 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3264
3265 return true;
3266 }
3267
3268 /**
3269 * bond_xmit_hash - generate a hash value based on the xmit policy
3270 * @bond: bonding device
3271 * @skb: buffer to use for headers
3272 *
3273 * This function will extract the necessary headers from the skb buffer and use
3274 * them to generate a hash based on the xmit_policy set in the bonding device
3275 */
3276 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3277 {
3278 struct flow_keys flow;
3279 u32 hash;
3280
3281 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3282 skb->l4_hash)
3283 return skb->hash;
3284
3285 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3286 !bond_flow_dissect(bond, skb, &flow))
3287 return bond_eth_hash(skb);
3288
3289 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3290 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3291 hash = bond_eth_hash(skb);
3292 else
3293 hash = (__force u32)flow.ports.ports;
3294 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3295 (__force u32)flow_get_u32_src(&flow);
3296 hash ^= (hash >> 16);
3297 hash ^= (hash >> 8);
3298
3299 return hash >> 1;
3300 }
3301
3302 /*-------------------------- Device entry points ----------------------------*/
3303
3304 void bond_work_init_all(struct bonding *bond)
3305 {
3306 INIT_DELAYED_WORK(&bond->mcast_work,
3307 bond_resend_igmp_join_requests_delayed);
3308 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3309 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3310 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3311 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3312 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3313 }
3314
3315 static void bond_work_cancel_all(struct bonding *bond)
3316 {
3317 cancel_delayed_work_sync(&bond->mii_work);
3318 cancel_delayed_work_sync(&bond->arp_work);
3319 cancel_delayed_work_sync(&bond->alb_work);
3320 cancel_delayed_work_sync(&bond->ad_work);
3321 cancel_delayed_work_sync(&bond->mcast_work);
3322 cancel_delayed_work_sync(&bond->slave_arr_work);
3323 }
3324
3325 static int bond_open(struct net_device *bond_dev)
3326 {
3327 struct bonding *bond = netdev_priv(bond_dev);
3328 struct list_head *iter;
3329 struct slave *slave;
3330
3331 /* reset slave->backup and slave->inactive */
3332 if (bond_has_slaves(bond)) {
3333 bond_for_each_slave(bond, slave, iter) {
3334 if (bond_uses_primary(bond) &&
3335 slave != rcu_access_pointer(bond->curr_active_slave)) {
3336 bond_set_slave_inactive_flags(slave,
3337 BOND_SLAVE_NOTIFY_NOW);
3338 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3339 bond_set_slave_active_flags(slave,
3340 BOND_SLAVE_NOTIFY_NOW);
3341 }
3342 }
3343 }
3344
3345 if (bond_is_lb(bond)) {
3346 /* bond_alb_initialize must be called before the timer
3347 * is started.
3348 */
3349 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3350 return -ENOMEM;
3351 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3352 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3353 }
3354
3355 if (bond->params.miimon) /* link check interval, in milliseconds. */
3356 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3357
3358 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3359 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3360 bond->recv_probe = bond_arp_rcv;
3361 }
3362
3363 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3364 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3365 /* register to receive LACPDUs */
3366 bond->recv_probe = bond_3ad_lacpdu_recv;
3367 bond_3ad_initiate_agg_selection(bond, 1);
3368 }
3369
3370 if (bond_mode_can_use_xmit_hash(bond))
3371 bond_update_slave_arr(bond, NULL);
3372
3373 return 0;
3374 }
3375
3376 static int bond_close(struct net_device *bond_dev)
3377 {
3378 struct bonding *bond = netdev_priv(bond_dev);
3379
3380 bond_work_cancel_all(bond);
3381 bond->send_peer_notif = 0;
3382 if (bond_is_lb(bond))
3383 bond_alb_deinitialize(bond);
3384 bond->recv_probe = NULL;
3385
3386 return 0;
3387 }
3388
3389 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3390 * that some drivers can provide 32bit values only.
3391 */
3392 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3393 const struct rtnl_link_stats64 *_new,
3394 const struct rtnl_link_stats64 *_old)
3395 {
3396 const u64 *new = (const u64 *)_new;
3397 const u64 *old = (const u64 *)_old;
3398 u64 *res = (u64 *)_res;
3399 int i;
3400
3401 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3402 u64 nv = new[i];
3403 u64 ov = old[i];
3404 s64 delta = nv - ov;
3405
3406 /* detects if this particular field is 32bit only */
3407 if (((nv | ov) >> 32) == 0)
3408 delta = (s64)(s32)((u32)nv - (u32)ov);
3409
3410 /* filter anomalies, some drivers reset their stats
3411 * at down/up events.
3412 */
3413 if (delta > 0)
3414 res[i] += delta;
3415 }
3416 }
3417
3418 static void bond_get_stats(struct net_device *bond_dev,
3419 struct rtnl_link_stats64 *stats)
3420 {
3421 struct bonding *bond = netdev_priv(bond_dev);
3422 struct rtnl_link_stats64 temp;
3423 struct list_head *iter;
3424 struct slave *slave;
3425
3426 spin_lock(&bond->stats_lock);
3427 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3428
3429 rcu_read_lock();
3430 bond_for_each_slave_rcu(bond, slave, iter) {
3431 const struct rtnl_link_stats64 *new =
3432 dev_get_stats(slave->dev, &temp);
3433
3434 bond_fold_stats(stats, new, &slave->slave_stats);
3435
3436 /* save off the slave stats for the next run */
3437 memcpy(&slave->slave_stats, new, sizeof(*new));
3438 }
3439 rcu_read_unlock();
3440
3441 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3442 spin_unlock(&bond->stats_lock);
3443 }
3444
3445 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3446 {
3447 struct bonding *bond = netdev_priv(bond_dev);
3448 struct net_device *slave_dev = NULL;
3449 struct ifbond k_binfo;
3450 struct ifbond __user *u_binfo = NULL;
3451 struct ifslave k_sinfo;
3452 struct ifslave __user *u_sinfo = NULL;
3453 struct mii_ioctl_data *mii = NULL;
3454 struct bond_opt_value newval;
3455 struct net *net;
3456 int res = 0;
3457
3458 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3459
3460 switch (cmd) {
3461 case SIOCGMIIPHY:
3462 mii = if_mii(ifr);
3463 if (!mii)
3464 return -EINVAL;
3465
3466 mii->phy_id = 0;
3467 /* Fall Through */
3468 case SIOCGMIIREG:
3469 /* We do this again just in case we were called by SIOCGMIIREG
3470 * instead of SIOCGMIIPHY.
3471 */
3472 mii = if_mii(ifr);
3473 if (!mii)
3474 return -EINVAL;
3475
3476 if (mii->reg_num == 1) {
3477 mii->val_out = 0;
3478 if (netif_carrier_ok(bond->dev))
3479 mii->val_out = BMSR_LSTATUS;
3480 }
3481
3482 return 0;
3483 case BOND_INFO_QUERY_OLD:
3484 case SIOCBONDINFOQUERY:
3485 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3486
3487 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3488 return -EFAULT;
3489
3490 bond_info_query(bond_dev, &k_binfo);
3491 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3492 return -EFAULT;
3493
3494 return 0;
3495 case BOND_SLAVE_INFO_QUERY_OLD:
3496 case SIOCBONDSLAVEINFOQUERY:
3497 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3498
3499 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3500 return -EFAULT;
3501
3502 res = bond_slave_info_query(bond_dev, &k_sinfo);
3503 if (res == 0 &&
3504 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3505 return -EFAULT;
3506
3507 return res;
3508 default:
3509 break;
3510 }
3511
3512 net = dev_net(bond_dev);
3513
3514 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3515 return -EPERM;
3516
3517 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3518
3519 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3520
3521 if (!slave_dev)
3522 return -ENODEV;
3523
3524 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3525 switch (cmd) {
3526 case BOND_ENSLAVE_OLD:
3527 case SIOCBONDENSLAVE:
3528 res = bond_enslave(bond_dev, slave_dev, NULL);
3529 break;
3530 case BOND_RELEASE_OLD:
3531 case SIOCBONDRELEASE:
3532 res = bond_release(bond_dev, slave_dev);
3533 break;
3534 case BOND_SETHWADDR_OLD:
3535 case SIOCBONDSETHWADDR:
3536 bond_set_dev_addr(bond_dev, slave_dev);
3537 res = 0;
3538 break;
3539 case BOND_CHANGE_ACTIVE_OLD:
3540 case SIOCBONDCHANGEACTIVE:
3541 bond_opt_initstr(&newval, slave_dev->name);
3542 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3543 &newval);
3544 break;
3545 default:
3546 res = -EOPNOTSUPP;
3547 }
3548
3549 return res;
3550 }
3551
3552 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3553 {
3554 struct bonding *bond = netdev_priv(bond_dev);
3555
3556 if (change & IFF_PROMISC)
3557 bond_set_promiscuity(bond,
3558 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3559
3560 if (change & IFF_ALLMULTI)
3561 bond_set_allmulti(bond,
3562 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3563 }
3564
3565 static void bond_set_rx_mode(struct net_device *bond_dev)
3566 {
3567 struct bonding *bond = netdev_priv(bond_dev);
3568 struct list_head *iter;
3569 struct slave *slave;
3570
3571 rcu_read_lock();
3572 if (bond_uses_primary(bond)) {
3573 slave = rcu_dereference(bond->curr_active_slave);
3574 if (slave) {
3575 dev_uc_sync(slave->dev, bond_dev);
3576 dev_mc_sync(slave->dev, bond_dev);
3577 }
3578 } else {
3579 bond_for_each_slave_rcu(bond, slave, iter) {
3580 dev_uc_sync_multiple(slave->dev, bond_dev);
3581 dev_mc_sync_multiple(slave->dev, bond_dev);
3582 }
3583 }
3584 rcu_read_unlock();
3585 }
3586
3587 static int bond_neigh_init(struct neighbour *n)
3588 {
3589 struct bonding *bond = netdev_priv(n->dev);
3590 const struct net_device_ops *slave_ops;
3591 struct neigh_parms parms;
3592 struct slave *slave;
3593 int ret;
3594
3595 slave = bond_first_slave(bond);
3596 if (!slave)
3597 return 0;
3598 slave_ops = slave->dev->netdev_ops;
3599 if (!slave_ops->ndo_neigh_setup)
3600 return 0;
3601
3602 parms.neigh_setup = NULL;
3603 parms.neigh_cleanup = NULL;
3604 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3605 if (ret)
3606 return ret;
3607
3608 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3609 * after the last slave has been detached. Assumes that all slaves
3610 * utilize the same neigh_cleanup (true at this writing as only user
3611 * is ipoib).
3612 */
3613 n->parms->neigh_cleanup = parms.neigh_cleanup;
3614
3615 if (!parms.neigh_setup)
3616 return 0;
3617
3618 return parms.neigh_setup(n);
3619 }
3620
3621 /* The bonding ndo_neigh_setup is called at init time beofre any
3622 * slave exists. So we must declare proxy setup function which will
3623 * be used at run time to resolve the actual slave neigh param setup.
3624 *
3625 * It's also called by master devices (such as vlans) to setup their
3626 * underlying devices. In that case - do nothing, we're already set up from
3627 * our init.
3628 */
3629 static int bond_neigh_setup(struct net_device *dev,
3630 struct neigh_parms *parms)
3631 {
3632 /* modify only our neigh_parms */
3633 if (parms->dev == dev)
3634 parms->neigh_setup = bond_neigh_init;
3635
3636 return 0;
3637 }
3638
3639 /* Change the MTU of all of a master's slaves to match the master */
3640 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3641 {
3642 struct bonding *bond = netdev_priv(bond_dev);
3643 struct slave *slave, *rollback_slave;
3644 struct list_head *iter;
3645 int res = 0;
3646
3647 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3648
3649 bond_for_each_slave(bond, slave, iter) {
3650 netdev_dbg(bond_dev, "s %p c_m %p\n",
3651 slave, slave->dev->netdev_ops->ndo_change_mtu);
3652
3653 res = dev_set_mtu(slave->dev, new_mtu);
3654
3655 if (res) {
3656 /* If we failed to set the slave's mtu to the new value
3657 * we must abort the operation even in ACTIVE_BACKUP
3658 * mode, because if we allow the backup slaves to have
3659 * different mtu values than the active slave we'll
3660 * need to change their mtu when doing a failover. That
3661 * means changing their mtu from timer context, which
3662 * is probably not a good idea.
3663 */
3664 netdev_dbg(bond_dev, "err %d %s\n", res,
3665 slave->dev->name);
3666 goto unwind;
3667 }
3668 }
3669
3670 bond_dev->mtu = new_mtu;
3671
3672 return 0;
3673
3674 unwind:
3675 /* unwind from head to the slave that failed */
3676 bond_for_each_slave(bond, rollback_slave, iter) {
3677 int tmp_res;
3678
3679 if (rollback_slave == slave)
3680 break;
3681
3682 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3683 if (tmp_res) {
3684 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3685 tmp_res, rollback_slave->dev->name);
3686 }
3687 }
3688
3689 return res;
3690 }
3691
3692 /* Change HW address
3693 *
3694 * Note that many devices must be down to change the HW address, and
3695 * downing the master releases all slaves. We can make bonds full of
3696 * bonding devices to test this, however.
3697 */
3698 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3699 {
3700 struct bonding *bond = netdev_priv(bond_dev);
3701 struct slave *slave, *rollback_slave;
3702 struct sockaddr_storage *ss = addr, tmp_ss;
3703 struct list_head *iter;
3704 int res = 0;
3705
3706 if (BOND_MODE(bond) == BOND_MODE_ALB)
3707 return bond_alb_set_mac_address(bond_dev, addr);
3708
3709
3710 netdev_dbg(bond_dev, "bond=%p\n", bond);
3711
3712 /* If fail_over_mac is enabled, do nothing and return success.
3713 * Returning an error causes ifenslave to fail.
3714 */
3715 if (bond->params.fail_over_mac &&
3716 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3717 return 0;
3718
3719 if (!is_valid_ether_addr(ss->__data))
3720 return -EADDRNOTAVAIL;
3721
3722 bond_for_each_slave(bond, slave, iter) {
3723 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3724 res = dev_set_mac_address(slave->dev, addr);
3725 if (res) {
3726 /* TODO: consider downing the slave
3727 * and retry ?
3728 * User should expect communications
3729 * breakage anyway until ARP finish
3730 * updating, so...
3731 */
3732 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3733 goto unwind;
3734 }
3735 }
3736
3737 /* success */
3738 memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
3739 return 0;
3740
3741 unwind:
3742 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
3743 tmp_ss.ss_family = bond_dev->type;
3744
3745 /* unwind from head to the slave that failed */
3746 bond_for_each_slave(bond, rollback_slave, iter) {
3747 int tmp_res;
3748
3749 if (rollback_slave == slave)
3750 break;
3751
3752 tmp_res = dev_set_mac_address(rollback_slave->dev,
3753 (struct sockaddr *)&tmp_ss);
3754 if (tmp_res) {
3755 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3756 tmp_res, rollback_slave->dev->name);
3757 }
3758 }
3759
3760 return res;
3761 }
3762
3763 /**
3764 * bond_xmit_slave_id - transmit skb through slave with slave_id
3765 * @bond: bonding device that is transmitting
3766 * @skb: buffer to transmit
3767 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3768 *
3769 * This function tries to transmit through slave with slave_id but in case
3770 * it fails, it tries to find the first available slave for transmission.
3771 * The skb is consumed in all cases, thus the function is void.
3772 */
3773 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3774 {
3775 struct list_head *iter;
3776 struct slave *slave;
3777 int i = slave_id;
3778
3779 /* Here we start from the slave with slave_id */
3780 bond_for_each_slave_rcu(bond, slave, iter) {
3781 if (--i < 0) {
3782 if (bond_slave_can_tx(slave)) {
3783 bond_dev_queue_xmit(bond, skb, slave->dev);
3784 return;
3785 }
3786 }
3787 }
3788
3789 /* Here we start from the first slave up to slave_id */
3790 i = slave_id;
3791 bond_for_each_slave_rcu(bond, slave, iter) {
3792 if (--i < 0)
3793 break;
3794 if (bond_slave_can_tx(slave)) {
3795 bond_dev_queue_xmit(bond, skb, slave->dev);
3796 return;
3797 }
3798 }
3799 /* no slave that can tx has been found */
3800 bond_tx_drop(bond->dev, skb);
3801 }
3802
3803 /**
3804 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3805 * @bond: bonding device to use
3806 *
3807 * Based on the value of the bonding device's packets_per_slave parameter
3808 * this function generates a slave id, which is usually used as the next
3809 * slave to transmit through.
3810 */
3811 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3812 {
3813 u32 slave_id;
3814 struct reciprocal_value reciprocal_packets_per_slave;
3815 int packets_per_slave = bond->params.packets_per_slave;
3816
3817 switch (packets_per_slave) {
3818 case 0:
3819 slave_id = prandom_u32();
3820 break;
3821 case 1:
3822 slave_id = bond->rr_tx_counter;
3823 break;
3824 default:
3825 reciprocal_packets_per_slave =
3826 bond->params.reciprocal_packets_per_slave;
3827 slave_id = reciprocal_divide(bond->rr_tx_counter,
3828 reciprocal_packets_per_slave);
3829 break;
3830 }
3831 bond->rr_tx_counter++;
3832
3833 return slave_id;
3834 }
3835
3836 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
3837 struct net_device *bond_dev)
3838 {
3839 struct bonding *bond = netdev_priv(bond_dev);
3840 struct iphdr *iph = ip_hdr(skb);
3841 struct slave *slave;
3842 u32 slave_id;
3843
3844 /* Start with the curr_active_slave that joined the bond as the
3845 * default for sending IGMP traffic. For failover purposes one
3846 * needs to maintain some consistency for the interface that will
3847 * send the join/membership reports. The curr_active_slave found
3848 * will send all of this type of traffic.
3849 */
3850 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3851 slave = rcu_dereference(bond->curr_active_slave);
3852 if (slave)
3853 bond_dev_queue_xmit(bond, skb, slave->dev);
3854 else
3855 bond_xmit_slave_id(bond, skb, 0);
3856 } else {
3857 int slave_cnt = READ_ONCE(bond->slave_cnt);
3858
3859 if (likely(slave_cnt)) {
3860 slave_id = bond_rr_gen_slave_id(bond);
3861 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3862 } else {
3863 bond_tx_drop(bond_dev, skb);
3864 }
3865 }
3866
3867 return NETDEV_TX_OK;
3868 }
3869
3870 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3871 * the bond has a usable interface.
3872 */
3873 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
3874 struct net_device *bond_dev)
3875 {
3876 struct bonding *bond = netdev_priv(bond_dev);
3877 struct slave *slave;
3878
3879 slave = rcu_dereference(bond->curr_active_slave);
3880 if (slave)
3881 bond_dev_queue_xmit(bond, skb, slave->dev);
3882 else
3883 bond_tx_drop(bond_dev, skb);
3884
3885 return NETDEV_TX_OK;
3886 }
3887
3888 /* Use this to update slave_array when (a) it's not appropriate to update
3889 * slave_array right away (note that update_slave_array() may sleep)
3890 * and / or (b) RTNL is not held.
3891 */
3892 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3893 {
3894 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3895 }
3896
3897 /* Slave array work handler. Holds only RTNL */
3898 static void bond_slave_arr_handler(struct work_struct *work)
3899 {
3900 struct bonding *bond = container_of(work, struct bonding,
3901 slave_arr_work.work);
3902 int ret;
3903
3904 if (!rtnl_trylock())
3905 goto err;
3906
3907 ret = bond_update_slave_arr(bond, NULL);
3908 rtnl_unlock();
3909 if (ret) {
3910 pr_warn_ratelimited("Failed to update slave array from WT\n");
3911 goto err;
3912 }
3913 return;
3914
3915 err:
3916 bond_slave_arr_work_rearm(bond, 1);
3917 }
3918
3919 /* Build the usable slaves array in control path for modes that use xmit-hash
3920 * to determine the slave interface -
3921 * (a) BOND_MODE_8023AD
3922 * (b) BOND_MODE_XOR
3923 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
3924 *
3925 * The caller is expected to hold RTNL only and NO other lock!
3926 */
3927 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3928 {
3929 struct slave *slave;
3930 struct list_head *iter;
3931 struct bond_up_slave *new_arr, *old_arr;
3932 int agg_id = 0;
3933 int ret = 0;
3934
3935 #ifdef CONFIG_LOCKDEP
3936 WARN_ON(lockdep_is_held(&bond->mode_lock));
3937 #endif
3938
3939 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3940 GFP_KERNEL);
3941 if (!new_arr) {
3942 ret = -ENOMEM;
3943 pr_err("Failed to build slave-array.\n");
3944 goto out;
3945 }
3946 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3947 struct ad_info ad_info;
3948
3949 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3950 pr_debug("bond_3ad_get_active_agg_info failed\n");
3951 kfree_rcu(new_arr, rcu);
3952 /* No active aggragator means it's not safe to use
3953 * the previous array.
3954 */
3955 old_arr = rtnl_dereference(bond->slave_arr);
3956 if (old_arr) {
3957 RCU_INIT_POINTER(bond->slave_arr, NULL);
3958 kfree_rcu(old_arr, rcu);
3959 }
3960 goto out;
3961 }
3962 agg_id = ad_info.aggregator_id;
3963 }
3964 bond_for_each_slave(bond, slave, iter) {
3965 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3966 struct aggregator *agg;
3967
3968 agg = SLAVE_AD_INFO(slave)->port.aggregator;
3969 if (!agg || agg->aggregator_identifier != agg_id)
3970 continue;
3971 }
3972 if (!bond_slave_can_tx(slave))
3973 continue;
3974 if (skipslave == slave)
3975 continue;
3976
3977 netdev_dbg(bond->dev,
3978 "Adding slave dev %s to tx hash array[%d]\n",
3979 slave->dev->name, new_arr->count);
3980
3981 new_arr->arr[new_arr->count++] = slave;
3982 }
3983
3984 old_arr = rtnl_dereference(bond->slave_arr);
3985 rcu_assign_pointer(bond->slave_arr, new_arr);
3986 if (old_arr)
3987 kfree_rcu(old_arr, rcu);
3988 out:
3989 if (ret != 0 && skipslave) {
3990 int idx;
3991
3992 /* Rare situation where caller has asked to skip a specific
3993 * slave but allocation failed (most likely!). BTW this is
3994 * only possible when the call is initiated from
3995 * __bond_release_one(). In this situation; overwrite the
3996 * skipslave entry in the array with the last entry from the
3997 * array to avoid a situation where the xmit path may choose
3998 * this to-be-skipped slave to send a packet out.
3999 */
4000 old_arr = rtnl_dereference(bond->slave_arr);
4001 for (idx = 0; idx < old_arr->count; idx++) {
4002 if (skipslave == old_arr->arr[idx]) {
4003 old_arr->arr[idx] =
4004 old_arr->arr[old_arr->count-1];
4005 old_arr->count--;
4006 break;
4007 }
4008 }
4009 }
4010 return ret;
4011 }
4012
4013 /* Use this Xmit function for 3AD as well as XOR modes. The current
4014 * usable slave array is formed in the control path. The xmit function
4015 * just calculates hash and sends the packet out.
4016 */
4017 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4018 struct net_device *dev)
4019 {
4020 struct bonding *bond = netdev_priv(dev);
4021 struct slave *slave;
4022 struct bond_up_slave *slaves;
4023 unsigned int count;
4024
4025 slaves = rcu_dereference(bond->slave_arr);
4026 count = slaves ? READ_ONCE(slaves->count) : 0;
4027 if (likely(count)) {
4028 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
4029 bond_dev_queue_xmit(bond, skb, slave->dev);
4030 } else {
4031 bond_tx_drop(dev, skb);
4032 }
4033
4034 return NETDEV_TX_OK;
4035 }
4036
4037 /* in broadcast mode, we send everything to all usable interfaces. */
4038 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4039 struct net_device *bond_dev)
4040 {
4041 struct bonding *bond = netdev_priv(bond_dev);
4042 struct slave *slave = NULL;
4043 struct list_head *iter;
4044
4045 bond_for_each_slave_rcu(bond, slave, iter) {
4046 if (bond_is_last_slave(bond, slave))
4047 break;
4048 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4049 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4050
4051 if (!skb2) {
4052 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4053 bond_dev->name, __func__);
4054 continue;
4055 }
4056 bond_dev_queue_xmit(bond, skb2, slave->dev);
4057 }
4058 }
4059 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4060 bond_dev_queue_xmit(bond, skb, slave->dev);
4061 else
4062 bond_tx_drop(bond_dev, skb);
4063
4064 return NETDEV_TX_OK;
4065 }
4066
4067 /*------------------------- Device initialization ---------------------------*/
4068
4069 /* Lookup the slave that corresponds to a qid */
4070 static inline int bond_slave_override(struct bonding *bond,
4071 struct sk_buff *skb)
4072 {
4073 struct slave *slave = NULL;
4074 struct list_head *iter;
4075
4076 if (!skb_rx_queue_recorded(skb))
4077 return 1;
4078
4079 /* Find out if any slaves have the same mapping as this skb. */
4080 bond_for_each_slave_rcu(bond, slave, iter) {
4081 if (slave->queue_id == skb_get_queue_mapping(skb)) {
4082 if (bond_slave_is_up(slave) &&
4083 slave->link == BOND_LINK_UP) {
4084 bond_dev_queue_xmit(bond, skb, slave->dev);
4085 return 0;
4086 }
4087 /* If the slave isn't UP, use default transmit policy. */
4088 break;
4089 }
4090 }
4091
4092 return 1;
4093 }
4094
4095
4096 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4097 void *accel_priv, select_queue_fallback_t fallback)
4098 {
4099 /* This helper function exists to help dev_pick_tx get the correct
4100 * destination queue. Using a helper function skips a call to
4101 * skb_tx_hash and will put the skbs in the queue we expect on their
4102 * way down to the bonding driver.
4103 */
4104 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4105
4106 /* Save the original txq to restore before passing to the driver */
4107 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4108
4109 if (unlikely(txq >= dev->real_num_tx_queues)) {
4110 do {
4111 txq -= dev->real_num_tx_queues;
4112 } while (txq >= dev->real_num_tx_queues);
4113 }
4114 return txq;
4115 }
4116
4117 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4118 {
4119 struct bonding *bond = netdev_priv(dev);
4120
4121 if (bond_should_override_tx_queue(bond) &&
4122 !bond_slave_override(bond, skb))
4123 return NETDEV_TX_OK;
4124
4125 switch (BOND_MODE(bond)) {
4126 case BOND_MODE_ROUNDROBIN:
4127 return bond_xmit_roundrobin(skb, dev);
4128 case BOND_MODE_ACTIVEBACKUP:
4129 return bond_xmit_activebackup(skb, dev);
4130 case BOND_MODE_8023AD:
4131 case BOND_MODE_XOR:
4132 return bond_3ad_xor_xmit(skb, dev);
4133 case BOND_MODE_BROADCAST:
4134 return bond_xmit_broadcast(skb, dev);
4135 case BOND_MODE_ALB:
4136 return bond_alb_xmit(skb, dev);
4137 case BOND_MODE_TLB:
4138 return bond_tlb_xmit(skb, dev);
4139 default:
4140 /* Should never happen, mode already checked */
4141 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4142 WARN_ON_ONCE(1);
4143 bond_tx_drop(dev, skb);
4144 return NETDEV_TX_OK;
4145 }
4146 }
4147
4148 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4149 {
4150 struct bonding *bond = netdev_priv(dev);
4151 netdev_tx_t ret = NETDEV_TX_OK;
4152
4153 /* If we risk deadlock from transmitting this in the
4154 * netpoll path, tell netpoll to queue the frame for later tx
4155 */
4156 if (unlikely(is_netpoll_tx_blocked(dev)))
4157 return NETDEV_TX_BUSY;
4158
4159 rcu_read_lock();
4160 if (bond_has_slaves(bond))
4161 ret = __bond_start_xmit(skb, dev);
4162 else
4163 bond_tx_drop(dev, skb);
4164 rcu_read_unlock();
4165
4166 return ret;
4167 }
4168
4169 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4170 struct ethtool_link_ksettings *cmd)
4171 {
4172 struct bonding *bond = netdev_priv(bond_dev);
4173 unsigned long speed = 0;
4174 struct list_head *iter;
4175 struct slave *slave;
4176
4177 cmd->base.duplex = DUPLEX_UNKNOWN;
4178 cmd->base.port = PORT_OTHER;
4179
4180 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4181 * do not need to check mode. Though link speed might not represent
4182 * the true receive or transmit bandwidth (not all modes are symmetric)
4183 * this is an accurate maximum.
4184 */
4185 bond_for_each_slave(bond, slave, iter) {
4186 if (bond_slave_can_tx(slave)) {
4187 if (slave->speed != SPEED_UNKNOWN)
4188 speed += slave->speed;
4189 if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4190 slave->duplex != DUPLEX_UNKNOWN)
4191 cmd->base.duplex = slave->duplex;
4192 }
4193 }
4194 cmd->base.speed = speed ? : SPEED_UNKNOWN;
4195
4196 return 0;
4197 }
4198
4199 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4200 struct ethtool_drvinfo *drvinfo)
4201 {
4202 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4203 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4204 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4205 BOND_ABI_VERSION);
4206 }
4207
4208 static const struct ethtool_ops bond_ethtool_ops = {
4209 .get_drvinfo = bond_ethtool_get_drvinfo,
4210 .get_link = ethtool_op_get_link,
4211 .get_link_ksettings = bond_ethtool_get_link_ksettings,
4212 };
4213
4214 static const struct net_device_ops bond_netdev_ops = {
4215 .ndo_init = bond_init,
4216 .ndo_uninit = bond_uninit,
4217 .ndo_open = bond_open,
4218 .ndo_stop = bond_close,
4219 .ndo_start_xmit = bond_start_xmit,
4220 .ndo_select_queue = bond_select_queue,
4221 .ndo_get_stats64 = bond_get_stats,
4222 .ndo_do_ioctl = bond_do_ioctl,
4223 .ndo_change_rx_flags = bond_change_rx_flags,
4224 .ndo_set_rx_mode = bond_set_rx_mode,
4225 .ndo_change_mtu = bond_change_mtu,
4226 .ndo_set_mac_address = bond_set_mac_address,
4227 .ndo_neigh_setup = bond_neigh_setup,
4228 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4229 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4230 #ifdef CONFIG_NET_POLL_CONTROLLER
4231 .ndo_netpoll_setup = bond_netpoll_setup,
4232 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4233 .ndo_poll_controller = bond_poll_controller,
4234 #endif
4235 .ndo_add_slave = bond_enslave,
4236 .ndo_del_slave = bond_release,
4237 .ndo_fix_features = bond_fix_features,
4238 .ndo_features_check = passthru_features_check,
4239 };
4240
4241 static const struct device_type bond_type = {
4242 .name = "bond",
4243 };
4244
4245 static void bond_destructor(struct net_device *bond_dev)
4246 {
4247 struct bonding *bond = netdev_priv(bond_dev);
4248 if (bond->wq)
4249 destroy_workqueue(bond->wq);
4250 }
4251
4252 void bond_setup(struct net_device *bond_dev)
4253 {
4254 struct bonding *bond = netdev_priv(bond_dev);
4255
4256 spin_lock_init(&bond->mode_lock);
4257 spin_lock_init(&bond->stats_lock);
4258 bond->params = bonding_defaults;
4259
4260 /* Initialize pointers */
4261 bond->dev = bond_dev;
4262
4263 /* Initialize the device entry points */
4264 ether_setup(bond_dev);
4265 bond_dev->max_mtu = ETH_MAX_MTU;
4266 bond_dev->netdev_ops = &bond_netdev_ops;
4267 bond_dev->ethtool_ops = &bond_ethtool_ops;
4268
4269 bond_dev->needs_free_netdev = true;
4270 bond_dev->priv_destructor = bond_destructor;
4271
4272 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4273
4274 /* Initialize the device options */
4275 bond_dev->flags |= IFF_MASTER;
4276 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4277 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4278
4279 /* don't acquire bond device's netif_tx_lock when transmitting */
4280 bond_dev->features |= NETIF_F_LLTX;
4281
4282 /* By default, we declare the bond to be fully
4283 * VLAN hardware accelerated capable. Special
4284 * care is taken in the various xmit functions
4285 * when there are slaves that are not hw accel
4286 * capable
4287 */
4288
4289 /* Don't allow bond devices to change network namespaces. */
4290 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4291
4292 bond_dev->hw_features = BOND_VLAN_FEATURES |
4293 NETIF_F_HW_VLAN_CTAG_TX |
4294 NETIF_F_HW_VLAN_CTAG_RX |
4295 NETIF_F_HW_VLAN_CTAG_FILTER;
4296
4297 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL | NETIF_F_GSO_UDP_L4;
4298 bond_dev->features |= bond_dev->hw_features;
4299 }
4300
4301 /* Destroy a bonding device.
4302 * Must be under rtnl_lock when this function is called.
4303 */
4304 static void bond_uninit(struct net_device *bond_dev)
4305 {
4306 struct bonding *bond = netdev_priv(bond_dev);
4307 struct list_head *iter;
4308 struct slave *slave;
4309 struct bond_up_slave *arr;
4310
4311 bond_netpoll_cleanup(bond_dev);
4312
4313 /* Release the bonded slaves */
4314 bond_for_each_slave(bond, slave, iter)
4315 __bond_release_one(bond_dev, slave->dev, true, true);
4316 netdev_info(bond_dev, "Released all slaves\n");
4317
4318 arr = rtnl_dereference(bond->slave_arr);
4319 if (arr) {
4320 RCU_INIT_POINTER(bond->slave_arr, NULL);
4321 kfree_rcu(arr, rcu);
4322 }
4323
4324 list_del(&bond->bond_list);
4325
4326 bond_debug_unregister(bond);
4327 }
4328
4329 /*------------------------- Module initialization ---------------------------*/
4330
4331 static int bond_check_params(struct bond_params *params)
4332 {
4333 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4334 struct bond_opt_value newval;
4335 const struct bond_opt_value *valptr;
4336 int arp_all_targets_value = 0;
4337 u16 ad_actor_sys_prio = 0;
4338 u16 ad_user_port_key = 0;
4339 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4340 int arp_ip_count;
4341 int bond_mode = BOND_MODE_ROUNDROBIN;
4342 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4343 int lacp_fast = 0;
4344 int tlb_dynamic_lb;
4345
4346 /* Convert string parameters. */
4347 if (mode) {
4348 bond_opt_initstr(&newval, mode);
4349 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4350 if (!valptr) {
4351 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4352 return -EINVAL;
4353 }
4354 bond_mode = valptr->value;
4355 }
4356
4357 if (xmit_hash_policy) {
4358 if (bond_mode == BOND_MODE_ROUNDROBIN ||
4359 bond_mode == BOND_MODE_ACTIVEBACKUP ||
4360 bond_mode == BOND_MODE_BROADCAST) {
4361 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4362 bond_mode_name(bond_mode));
4363 } else {
4364 bond_opt_initstr(&newval, xmit_hash_policy);
4365 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4366 &newval);
4367 if (!valptr) {
4368 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4369 xmit_hash_policy);
4370 return -EINVAL;
4371 }
4372 xmit_hashtype = valptr->value;
4373 }
4374 }
4375
4376 if (lacp_rate) {
4377 if (bond_mode != BOND_MODE_8023AD) {
4378 pr_info("lacp_rate param is irrelevant in mode %s\n",
4379 bond_mode_name(bond_mode));
4380 } else {
4381 bond_opt_initstr(&newval, lacp_rate);
4382 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4383 &newval);
4384 if (!valptr) {
4385 pr_err("Error: Invalid lacp rate \"%s\"\n",
4386 lacp_rate);
4387 return -EINVAL;
4388 }
4389 lacp_fast = valptr->value;
4390 }
4391 }
4392
4393 if (ad_select) {
4394 bond_opt_initstr(&newval, ad_select);
4395 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4396 &newval);
4397 if (!valptr) {
4398 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4399 return -EINVAL;
4400 }
4401 params->ad_select = valptr->value;
4402 if (bond_mode != BOND_MODE_8023AD)
4403 pr_warn("ad_select param only affects 802.3ad mode\n");
4404 } else {
4405 params->ad_select = BOND_AD_STABLE;
4406 }
4407
4408 if (max_bonds < 0) {
4409 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4410 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4411 max_bonds = BOND_DEFAULT_MAX_BONDS;
4412 }
4413
4414 if (miimon < 0) {
4415 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4416 miimon, INT_MAX);
4417 miimon = 0;
4418 }
4419
4420 if (updelay < 0) {
4421 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4422 updelay, INT_MAX);
4423 updelay = 0;
4424 }
4425
4426 if (downdelay < 0) {
4427 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4428 downdelay, INT_MAX);
4429 downdelay = 0;
4430 }
4431
4432 if ((use_carrier != 0) && (use_carrier != 1)) {
4433 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4434 use_carrier);
4435 use_carrier = 1;
4436 }
4437
4438 if (num_peer_notif < 0 || num_peer_notif > 255) {
4439 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4440 num_peer_notif);
4441 num_peer_notif = 1;
4442 }
4443
4444 /* reset values for 802.3ad/TLB/ALB */
4445 if (!bond_mode_uses_arp(bond_mode)) {
4446 if (!miimon) {
4447 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");
4448 pr_warn("Forcing miimon to 100msec\n");
4449 miimon = BOND_DEFAULT_MIIMON;
4450 }
4451 }
4452
4453 if (tx_queues < 1 || tx_queues > 255) {
4454 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4455 tx_queues, BOND_DEFAULT_TX_QUEUES);
4456 tx_queues = BOND_DEFAULT_TX_QUEUES;
4457 }
4458
4459 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4460 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4461 all_slaves_active);
4462 all_slaves_active = 0;
4463 }
4464
4465 if (resend_igmp < 0 || resend_igmp > 255) {
4466 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4467 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4468 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4469 }
4470
4471 bond_opt_initval(&newval, packets_per_slave);
4472 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4473 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4474 packets_per_slave, USHRT_MAX);
4475 packets_per_slave = 1;
4476 }
4477
4478 if (bond_mode == BOND_MODE_ALB) {
4479 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",
4480 updelay);
4481 }
4482
4483 if (!miimon) {
4484 if (updelay || downdelay) {
4485 /* just warn the user the up/down delay will have
4486 * no effect since miimon is zero...
4487 */
4488 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",
4489 updelay, downdelay);
4490 }
4491 } else {
4492 /* don't allow arp monitoring */
4493 if (arp_interval) {
4494 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4495 miimon, arp_interval);
4496 arp_interval = 0;
4497 }
4498
4499 if ((updelay % miimon) != 0) {
4500 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4501 updelay, miimon, (updelay / miimon) * miimon);
4502 }
4503
4504 updelay /= miimon;
4505
4506 if ((downdelay % miimon) != 0) {
4507 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4508 downdelay, miimon,
4509 (downdelay / miimon) * miimon);
4510 }
4511
4512 downdelay /= miimon;
4513 }
4514
4515 if (arp_interval < 0) {
4516 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4517 arp_interval, INT_MAX);
4518 arp_interval = 0;
4519 }
4520
4521 for (arp_ip_count = 0, i = 0;
4522 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4523 __be32 ip;
4524
4525 /* not a complete check, but good enough to catch mistakes */
4526 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4527 !bond_is_ip_target_ok(ip)) {
4528 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4529 arp_ip_target[i]);
4530 arp_interval = 0;
4531 } else {
4532 if (bond_get_targets_ip(arp_target, ip) == -1)
4533 arp_target[arp_ip_count++] = ip;
4534 else
4535 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4536 &ip);
4537 }
4538 }
4539
4540 if (arp_interval && !arp_ip_count) {
4541 /* don't allow arping if no arp_ip_target given... */
4542 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4543 arp_interval);
4544 arp_interval = 0;
4545 }
4546
4547 if (arp_validate) {
4548 if (!arp_interval) {
4549 pr_err("arp_validate requires arp_interval\n");
4550 return -EINVAL;
4551 }
4552
4553 bond_opt_initstr(&newval, arp_validate);
4554 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4555 &newval);
4556 if (!valptr) {
4557 pr_err("Error: invalid arp_validate \"%s\"\n",
4558 arp_validate);
4559 return -EINVAL;
4560 }
4561 arp_validate_value = valptr->value;
4562 } else {
4563 arp_validate_value = 0;
4564 }
4565
4566 if (arp_all_targets) {
4567 bond_opt_initstr(&newval, arp_all_targets);
4568 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4569 &newval);
4570 if (!valptr) {
4571 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4572 arp_all_targets);
4573 arp_all_targets_value = 0;
4574 } else {
4575 arp_all_targets_value = valptr->value;
4576 }
4577 }
4578
4579 if (miimon) {
4580 pr_info("MII link monitoring set to %d ms\n", miimon);
4581 } else if (arp_interval) {
4582 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4583 arp_validate_value);
4584 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4585 arp_interval, valptr->string, arp_ip_count);
4586
4587 for (i = 0; i < arp_ip_count; i++)
4588 pr_cont(" %s", arp_ip_target[i]);
4589
4590 pr_cont("\n");
4591
4592 } else if (max_bonds) {
4593 /* miimon and arp_interval not set, we need one so things
4594 * work as expected, see bonding.txt for details
4595 */
4596 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");
4597 }
4598
4599 if (primary && !bond_mode_uses_primary(bond_mode)) {
4600 /* currently, using a primary only makes sense
4601 * in active backup, TLB or ALB modes
4602 */
4603 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4604 primary, bond_mode_name(bond_mode));
4605 primary = NULL;
4606 }
4607
4608 if (primary && primary_reselect) {
4609 bond_opt_initstr(&newval, primary_reselect);
4610 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4611 &newval);
4612 if (!valptr) {
4613 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4614 primary_reselect);
4615 return -EINVAL;
4616 }
4617 primary_reselect_value = valptr->value;
4618 } else {
4619 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4620 }
4621
4622 if (fail_over_mac) {
4623 bond_opt_initstr(&newval, fail_over_mac);
4624 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4625 &newval);
4626 if (!valptr) {
4627 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4628 fail_over_mac);
4629 return -EINVAL;
4630 }
4631 fail_over_mac_value = valptr->value;
4632 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4633 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4634 } else {
4635 fail_over_mac_value = BOND_FOM_NONE;
4636 }
4637
4638 bond_opt_initstr(&newval, "default");
4639 valptr = bond_opt_parse(
4640 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4641 &newval);
4642 if (!valptr) {
4643 pr_err("Error: No ad_actor_sys_prio default value");
4644 return -EINVAL;
4645 }
4646 ad_actor_sys_prio = valptr->value;
4647
4648 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4649 &newval);
4650 if (!valptr) {
4651 pr_err("Error: No ad_user_port_key default value");
4652 return -EINVAL;
4653 }
4654 ad_user_port_key = valptr->value;
4655
4656 bond_opt_initstr(&newval, "default");
4657 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
4658 if (!valptr) {
4659 pr_err("Error: No tlb_dynamic_lb default value");
4660 return -EINVAL;
4661 }
4662 tlb_dynamic_lb = valptr->value;
4663
4664 if (lp_interval == 0) {
4665 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4666 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4667 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4668 }
4669
4670 /* fill params struct with the proper values */
4671 params->mode = bond_mode;
4672 params->xmit_policy = xmit_hashtype;
4673 params->miimon = miimon;
4674 params->num_peer_notif = num_peer_notif;
4675 params->arp_interval = arp_interval;
4676 params->arp_validate = arp_validate_value;
4677 params->arp_all_targets = arp_all_targets_value;
4678 params->updelay = updelay;
4679 params->downdelay = downdelay;
4680 params->use_carrier = use_carrier;
4681 params->lacp_fast = lacp_fast;
4682 params->primary[0] = 0;
4683 params->primary_reselect = primary_reselect_value;
4684 params->fail_over_mac = fail_over_mac_value;
4685 params->tx_queues = tx_queues;
4686 params->all_slaves_active = all_slaves_active;
4687 params->resend_igmp = resend_igmp;
4688 params->min_links = min_links;
4689 params->lp_interval = lp_interval;
4690 params->packets_per_slave = packets_per_slave;
4691 params->tlb_dynamic_lb = tlb_dynamic_lb;
4692 params->ad_actor_sys_prio = ad_actor_sys_prio;
4693 eth_zero_addr(params->ad_actor_system);
4694 params->ad_user_port_key = ad_user_port_key;
4695 if (packets_per_slave > 0) {
4696 params->reciprocal_packets_per_slave =
4697 reciprocal_value(packets_per_slave);
4698 } else {
4699 /* reciprocal_packets_per_slave is unused if
4700 * packets_per_slave is 0 or 1, just initialize it
4701 */
4702 params->reciprocal_packets_per_slave =
4703 (struct reciprocal_value) { 0 };
4704 }
4705
4706 if (primary) {
4707 strncpy(params->primary, primary, IFNAMSIZ);
4708 params->primary[IFNAMSIZ - 1] = 0;
4709 }
4710
4711 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4712
4713 return 0;
4714 }
4715
4716 /* Called from registration process */
4717 static int bond_init(struct net_device *bond_dev)
4718 {
4719 struct bonding *bond = netdev_priv(bond_dev);
4720 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4721
4722 netdev_dbg(bond_dev, "Begin bond_init\n");
4723
4724 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
4725 if (!bond->wq)
4726 return -ENOMEM;
4727
4728 netdev_lockdep_set_classes(bond_dev);
4729
4730 list_add_tail(&bond->bond_list, &bn->dev_list);
4731
4732 bond_prepare_sysfs_group(bond);
4733
4734 bond_debug_register(bond);
4735
4736 /* Ensure valid dev_addr */
4737 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4738 bond_dev->addr_assign_type == NET_ADDR_PERM)
4739 eth_hw_addr_random(bond_dev);
4740
4741 return 0;
4742 }
4743
4744 unsigned int bond_get_num_tx_queues(void)
4745 {
4746 return tx_queues;
4747 }
4748
4749 /* Create a new bond based on the specified name and bonding parameters.
4750 * If name is NULL, obtain a suitable "bond%d" name for us.
4751 * Caller must NOT hold rtnl_lock; we need to release it here before we
4752 * set up our sysfs entries.
4753 */
4754 int bond_create(struct net *net, const char *name)
4755 {
4756 struct net_device *bond_dev;
4757 struct bonding *bond;
4758 struct alb_bond_info *bond_info;
4759 int res;
4760
4761 rtnl_lock();
4762
4763 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4764 name ? name : "bond%d", NET_NAME_UNKNOWN,
4765 bond_setup, tx_queues);
4766 if (!bond_dev) {
4767 pr_err("%s: eek! can't alloc netdev!\n", name);
4768 rtnl_unlock();
4769 return -ENOMEM;
4770 }
4771
4772 /*
4773 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4774 * It is set to 0 by default which is wrong.
4775 */
4776 bond = netdev_priv(bond_dev);
4777 bond_info = &(BOND_ALB_INFO(bond));
4778 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4779
4780 dev_net_set(bond_dev, net);
4781 bond_dev->rtnl_link_ops = &bond_link_ops;
4782
4783 res = register_netdevice(bond_dev);
4784
4785 netif_carrier_off(bond_dev);
4786
4787 bond_work_init_all(bond);
4788
4789 rtnl_unlock();
4790 if (res < 0)
4791 free_netdev(bond_dev);
4792 return res;
4793 }
4794
4795 static int __net_init bond_net_init(struct net *net)
4796 {
4797 struct bond_net *bn = net_generic(net, bond_net_id);
4798
4799 bn->net = net;
4800 INIT_LIST_HEAD(&bn->dev_list);
4801
4802 bond_create_proc_dir(bn);
4803 bond_create_sysfs(bn);
4804
4805 return 0;
4806 }
4807
4808 static void __net_exit bond_net_exit(struct net *net)
4809 {
4810 struct bond_net *bn = net_generic(net, bond_net_id);
4811 struct bonding *bond, *tmp_bond;
4812 LIST_HEAD(list);
4813
4814 bond_destroy_sysfs(bn);
4815
4816 /* Kill off any bonds created after unregistering bond rtnl ops */
4817 rtnl_lock();
4818 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4819 unregister_netdevice_queue(bond->dev, &list);
4820 unregister_netdevice_many(&list);
4821 rtnl_unlock();
4822
4823 bond_destroy_proc_dir(bn);
4824 }
4825
4826 static struct pernet_operations bond_net_ops = {
4827 .init = bond_net_init,
4828 .exit = bond_net_exit,
4829 .id = &bond_net_id,
4830 .size = sizeof(struct bond_net),
4831 };
4832
4833 static int __init bonding_init(void)
4834 {
4835 int i;
4836 int res;
4837
4838 pr_info("%s", bond_version);
4839
4840 res = bond_check_params(&bonding_defaults);
4841 if (res)
4842 goto out;
4843
4844 res = register_pernet_subsys(&bond_net_ops);
4845 if (res)
4846 goto out;
4847
4848 res = bond_netlink_init();
4849 if (res)
4850 goto err_link;
4851
4852 bond_create_debugfs();
4853
4854 for (i = 0; i < max_bonds; i++) {
4855 res = bond_create(&init_net, NULL);
4856 if (res)
4857 goto err;
4858 }
4859
4860 register_netdevice_notifier(&bond_netdev_notifier);
4861 out:
4862 return res;
4863 err:
4864 bond_destroy_debugfs();
4865 bond_netlink_fini();
4866 err_link:
4867 unregister_pernet_subsys(&bond_net_ops);
4868 goto out;
4869
4870 }
4871
4872 static void __exit bonding_exit(void)
4873 {
4874 unregister_netdevice_notifier(&bond_netdev_notifier);
4875
4876 bond_destroy_debugfs();
4877
4878 bond_netlink_fini();
4879 unregister_pernet_subsys(&bond_net_ops);
4880
4881 #ifdef CONFIG_NET_POLL_CONTROLLER
4882 /* Make sure we don't have an imbalance on our netpoll blocking */
4883 WARN_ON(atomic_read(&netpoll_block_tx));
4884 #endif
4885 }
4886
4887 module_init(bonding_init);
4888 module_exit(bonding_exit);
4889 MODULE_LICENSE("GPL");
4890 MODULE_VERSION(DRV_VERSION);
4891 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4892 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
(deprecated) Btrfs devel tree