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ARM: dts: add 'dr_mode' property to hsotg devices for exynos boards
[linux/fpc-iii.git] / drivers / net / bonding / bond_main.c
blob184c434ae3055e4b8a586c116d1274ddbccec6c5
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_keys.h>
80 #include <net/bonding.h>
81 #include <net/bond_3ad.h>
82 #include <net/bond_alb.h>
83
84 /*---------------------------- Module parameters ----------------------------*/
85
86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
87
88 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
89 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
90 static int num_peer_notif = 1;
91 static int miimon;
92 static int updelay;
93 static int downdelay;
94 static int use_carrier = 1;
95 static char *mode;
96 static char *primary;
97 static char *primary_reselect;
98 static char *lacp_rate;
99 static int min_links;
100 static char *ad_select;
101 static char *xmit_hash_policy;
102 static int arp_interval;
103 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
104 static char *arp_validate;
105 static char *arp_all_targets;
106 static char *fail_over_mac;
107 static int all_slaves_active;
108 static struct bond_params bonding_defaults;
109 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
110 static int packets_per_slave = 1;
111 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
112
113 module_param(max_bonds, int, 0);
114 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
115 module_param(tx_queues, int, 0);
116 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
117 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
118 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
119 "failover event (alias of num_unsol_na)");
120 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
121 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
122 "failover event (alias of num_grat_arp)");
123 module_param(miimon, int, 0);
124 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
125 module_param(updelay, int, 0);
126 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
127 module_param(downdelay, int, 0);
128 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
129 "in milliseconds");
130 module_param(use_carrier, int, 0);
131 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
132 "0 for off, 1 for on (default)");
133 module_param(mode, charp, 0);
134 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
135 "1 for active-backup, 2 for balance-xor, "
136 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
137 "6 for balance-alb");
138 module_param(primary, charp, 0);
139 MODULE_PARM_DESC(primary, "Primary network device to use");
140 module_param(primary_reselect, charp, 0);
141 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
142 "once it comes up; "
143 "0 for always (default), "
144 "1 for only if speed of primary is "
145 "better, "
146 "2 for only on active slave "
147 "failure");
148 module_param(lacp_rate, charp, 0);
149 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
150 "0 for slow, 1 for fast");
151 module_param(ad_select, charp, 0);
152 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
153 "0 for stable (default), 1 for bandwidth, "
154 "2 for count");
155 module_param(min_links, int, 0);
156 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
157
158 module_param(xmit_hash_policy, charp, 0);
159 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
160 "0 for layer 2 (default), 1 for layer 3+4, "
161 "2 for layer 2+3, 3 for encap layer 2+3, "
162 "4 for encap layer 3+4");
163 module_param(arp_interval, int, 0);
164 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
165 module_param_array(arp_ip_target, charp, NULL, 0);
166 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
167 module_param(arp_validate, charp, 0);
168 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
169 "0 for none (default), 1 for active, "
170 "2 for backup, 3 for all");
171 module_param(arp_all_targets, charp, 0);
172 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
173 module_param(fail_over_mac, charp, 0);
174 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
175 "the same MAC; 0 for none (default), "
176 "1 for active, 2 for follow");
177 module_param(all_slaves_active, int, 0);
178 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
179 "by setting active flag for all slaves; "
180 "0 for never (default), 1 for always.");
181 module_param(resend_igmp, int, 0);
182 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
183 "link failure");
184 module_param(packets_per_slave, int, 0);
185 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
186 "mode; 0 for a random slave, 1 packet per "
187 "slave (default), >1 packets per slave.");
188 module_param(lp_interval, uint, 0);
189 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
190 "the bonding driver sends learning packets to "
191 "each slaves peer switch. The default is 1.");
192
193 /*----------------------------- Global variables ----------------------------*/
194
195 #ifdef CONFIG_NET_POLL_CONTROLLER
196 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
197 #endif
198
199 int bond_net_id __read_mostly;
200
201 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
202 static int arp_ip_count;
203 static int bond_mode = BOND_MODE_ROUNDROBIN;
204 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
205 static int lacp_fast;
206
207 /*-------------------------- Forward declarations ---------------------------*/
208
209 static int bond_init(struct net_device *bond_dev);
210 static void bond_uninit(struct net_device *bond_dev);
211 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
212 struct rtnl_link_stats64 *stats);
213 static void bond_slave_arr_handler(struct work_struct *work);
214
215 /*---------------------------- General routines -----------------------------*/
216
217 const char *bond_mode_name(int mode)
218 {
219 static const char *names[] = {
220 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
221 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
222 [BOND_MODE_XOR] = "load balancing (xor)",
223 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
224 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
225 [BOND_MODE_TLB] = "transmit load balancing",
226 [BOND_MODE_ALB] = "adaptive load balancing",
227 };
228
229 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
230 return "unknown";
231
232 return names[mode];
233 }
234
235 /*---------------------------------- VLAN -----------------------------------*/
236
237 /**
238 * bond_dev_queue_xmit - Prepare skb for xmit.
239 *
240 * @bond: bond device that got this skb for tx.
241 * @skb: hw accel VLAN tagged skb to transmit
242 * @slave_dev: slave that is supposed to xmit this skbuff
243 */
244 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
245 struct net_device *slave_dev)
246 {
247 skb->dev = slave_dev;
248
249 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
250 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
251 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
252
253 if (unlikely(netpoll_tx_running(bond->dev)))
254 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
255 else
256 dev_queue_xmit(skb);
257 }
258
259 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
260 * We don't protect the slave list iteration with a lock because:
261 * a. This operation is performed in IOCTL context,
262 * b. The operation is protected by the RTNL semaphore in the 8021q code,
263 * c. Holding a lock with BH disabled while directly calling a base driver
264 * entry point is generally a BAD idea.
265 *
266 * The design of synchronization/protection for this operation in the 8021q
267 * module is good for one or more VLAN devices over a single physical device
268 * and cannot be extended for a teaming solution like bonding, so there is a
269 * potential race condition here where a net device from the vlan group might
270 * be referenced (either by a base driver or the 8021q code) while it is being
271 * removed from the system. However, it turns out we're not making matters
272 * worse, and if it works for regular VLAN usage it will work here too.
273 */
274
275 /**
276 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
277 * @bond_dev: bonding net device that got called
278 * @vid: vlan id being added
279 */
280 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
281 __be16 proto, u16 vid)
282 {
283 struct bonding *bond = netdev_priv(bond_dev);
284 struct slave *slave, *rollback_slave;
285 struct list_head *iter;
286 int res;
287
288 bond_for_each_slave(bond, slave, iter) {
289 res = vlan_vid_add(slave->dev, proto, vid);
290 if (res)
291 goto unwind;
292 }
293
294 return 0;
295
296 unwind:
297 /* unwind to the slave that failed */
298 bond_for_each_slave(bond, rollback_slave, iter) {
299 if (rollback_slave == slave)
300 break;
301
302 vlan_vid_del(rollback_slave->dev, proto, vid);
303 }
304
305 return res;
306 }
307
308 /**
309 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
310 * @bond_dev: bonding net device that got called
311 * @vid: vlan id being removed
312 */
313 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
314 __be16 proto, u16 vid)
315 {
316 struct bonding *bond = netdev_priv(bond_dev);
317 struct list_head *iter;
318 struct slave *slave;
319
320 bond_for_each_slave(bond, slave, iter)
321 vlan_vid_del(slave->dev, proto, vid);
322
323 if (bond_is_lb(bond))
324 bond_alb_clear_vlan(bond, vid);
325
326 return 0;
327 }
328
329 /*------------------------------- Link status -------------------------------*/
330
331 /* Set the carrier state for the master according to the state of its
332 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
333 * do special 802.3ad magic.
334 *
335 * Returns zero if carrier state does not change, nonzero if it does.
336 */
337 static int bond_set_carrier(struct bonding *bond)
338 {
339 struct list_head *iter;
340 struct slave *slave;
341
342 if (!bond_has_slaves(bond))
343 goto down;
344
345 if (BOND_MODE(bond) == BOND_MODE_8023AD)
346 return bond_3ad_set_carrier(bond);
347
348 bond_for_each_slave(bond, slave, iter) {
349 if (slave->link == BOND_LINK_UP) {
350 if (!netif_carrier_ok(bond->dev)) {
351 netif_carrier_on(bond->dev);
352 return 1;
353 }
354 return 0;
355 }
356 }
357
358 down:
359 if (netif_carrier_ok(bond->dev)) {
360 netif_carrier_off(bond->dev);
361 return 1;
362 }
363 return 0;
364 }
365
366 /* Get link speed and duplex from the slave's base driver
367 * using ethtool. If for some reason the call fails or the
368 * values are invalid, set speed and duplex to -1,
369 * and return.
370 */
371 static void bond_update_speed_duplex(struct slave *slave)
372 {
373 struct net_device *slave_dev = slave->dev;
374 struct ethtool_cmd ecmd;
375 u32 slave_speed;
376 int res;
377
378 slave->speed = SPEED_UNKNOWN;
379 slave->duplex = DUPLEX_UNKNOWN;
380
381 res = __ethtool_get_settings(slave_dev, &ecmd);
382 if (res < 0)
383 return;
384
385 slave_speed = ethtool_cmd_speed(&ecmd);
386 if (slave_speed == 0 || slave_speed == ((__u32) -1))
387 return;
388
389 switch (ecmd.duplex) {
390 case DUPLEX_FULL:
391 case DUPLEX_HALF:
392 break;
393 default:
394 return;
395 }
396
397 slave->speed = slave_speed;
398 slave->duplex = ecmd.duplex;
399
400 return;
401 }
402
403 const char *bond_slave_link_status(s8 link)
404 {
405 switch (link) {
406 case BOND_LINK_UP:
407 return "up";
408 case BOND_LINK_FAIL:
409 return "going down";
410 case BOND_LINK_DOWN:
411 return "down";
412 case BOND_LINK_BACK:
413 return "going back";
414 default:
415 return "unknown";
416 }
417 }
418
419 /* if <dev> supports MII link status reporting, check its link status.
420 *
421 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
422 * depending upon the setting of the use_carrier parameter.
423 *
424 * Return either BMSR_LSTATUS, meaning that the link is up (or we
425 * can't tell and just pretend it is), or 0, meaning that the link is
426 * down.
427 *
428 * If reporting is non-zero, instead of faking link up, return -1 if
429 * both ETHTOOL and MII ioctls fail (meaning the device does not
430 * support them). If use_carrier is set, return whatever it says.
431 * It'd be nice if there was a good way to tell if a driver supports
432 * netif_carrier, but there really isn't.
433 */
434 static int bond_check_dev_link(struct bonding *bond,
435 struct net_device *slave_dev, int reporting)
436 {
437 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
438 int (*ioctl)(struct net_device *, struct ifreq *, int);
439 struct ifreq ifr;
440 struct mii_ioctl_data *mii;
441
442 if (!reporting && !netif_running(slave_dev))
443 return 0;
444
445 if (bond->params.use_carrier)
446 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
447
448 /* Try to get link status using Ethtool first. */
449 if (slave_dev->ethtool_ops->get_link)
450 return slave_dev->ethtool_ops->get_link(slave_dev) ?
451 BMSR_LSTATUS : 0;
452
453 /* Ethtool can't be used, fallback to MII ioctls. */
454 ioctl = slave_ops->ndo_do_ioctl;
455 if (ioctl) {
456 /* TODO: set pointer to correct ioctl on a per team member
457 * bases to make this more efficient. that is, once
458 * we determine the correct ioctl, we will always
459 * call it and not the others for that team
460 * member.
461 */
462
463 /* We cannot assume that SIOCGMIIPHY will also read a
464 * register; not all network drivers (e.g., e100)
465 * support that.
466 */
467
468 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
469 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
470 mii = if_mii(&ifr);
471 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
472 mii->reg_num = MII_BMSR;
473 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
474 return mii->val_out & BMSR_LSTATUS;
475 }
476 }
477
478 /* If reporting, report that either there's no dev->do_ioctl,
479 * or both SIOCGMIIREG and get_link failed (meaning that we
480 * cannot report link status). If not reporting, pretend
481 * we're ok.
482 */
483 return reporting ? -1 : BMSR_LSTATUS;
484 }
485
486 /*----------------------------- Multicast list ------------------------------*/
487
488 /* Push the promiscuity flag down to appropriate slaves */
489 static int bond_set_promiscuity(struct bonding *bond, int inc)
490 {
491 struct list_head *iter;
492 int err = 0;
493
494 if (bond_uses_primary(bond)) {
495 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
496
497 if (curr_active)
498 err = dev_set_promiscuity(curr_active->dev, inc);
499 } else {
500 struct slave *slave;
501
502 bond_for_each_slave(bond, slave, iter) {
503 err = dev_set_promiscuity(slave->dev, inc);
504 if (err)
505 return err;
506 }
507 }
508 return err;
509 }
510
511 /* Push the allmulti flag down to all slaves */
512 static int bond_set_allmulti(struct bonding *bond, int inc)
513 {
514 struct list_head *iter;
515 int err = 0;
516
517 if (bond_uses_primary(bond)) {
518 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
519
520 if (curr_active)
521 err = dev_set_allmulti(curr_active->dev, inc);
522 } else {
523 struct slave *slave;
524
525 bond_for_each_slave(bond, slave, iter) {
526 err = dev_set_allmulti(slave->dev, inc);
527 if (err)
528 return err;
529 }
530 }
531 return err;
532 }
533
534 /* Retrieve the list of registered multicast addresses for the bonding
535 * device and retransmit an IGMP JOIN request to the current active
536 * slave.
537 */
538 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
539 {
540 struct bonding *bond = container_of(work, struct bonding,
541 mcast_work.work);
542
543 if (!rtnl_trylock()) {
544 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
545 return;
546 }
547 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
548
549 if (bond->igmp_retrans > 1) {
550 bond->igmp_retrans--;
551 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
552 }
553 rtnl_unlock();
554 }
555
556 /* Flush bond's hardware addresses from slave */
557 static void bond_hw_addr_flush(struct net_device *bond_dev,
558 struct net_device *slave_dev)
559 {
560 struct bonding *bond = netdev_priv(bond_dev);
561
562 dev_uc_unsync(slave_dev, bond_dev);
563 dev_mc_unsync(slave_dev, bond_dev);
564
565 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
566 /* del lacpdu mc addr from mc list */
567 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
568
569 dev_mc_del(slave_dev, lacpdu_multicast);
570 }
571 }
572
573 /*--------------------------- Active slave change ---------------------------*/
574
575 /* Update the hardware address list and promisc/allmulti for the new and
576 * old active slaves (if any). Modes that are not using primary keep all
577 * slaves up date at all times; only the modes that use primary need to call
578 * this function to swap these settings during a failover.
579 */
580 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
581 struct slave *old_active)
582 {
583 if (old_active) {
584 if (bond->dev->flags & IFF_PROMISC)
585 dev_set_promiscuity(old_active->dev, -1);
586
587 if (bond->dev->flags & IFF_ALLMULTI)
588 dev_set_allmulti(old_active->dev, -1);
589
590 bond_hw_addr_flush(bond->dev, old_active->dev);
591 }
592
593 if (new_active) {
594 /* FIXME: Signal errors upstream. */
595 if (bond->dev->flags & IFF_PROMISC)
596 dev_set_promiscuity(new_active->dev, 1);
597
598 if (bond->dev->flags & IFF_ALLMULTI)
599 dev_set_allmulti(new_active->dev, 1);
600
601 netif_addr_lock_bh(bond->dev);
602 dev_uc_sync(new_active->dev, bond->dev);
603 dev_mc_sync(new_active->dev, bond->dev);
604 netif_addr_unlock_bh(bond->dev);
605 }
606 }
607
608 /**
609 * bond_set_dev_addr - clone slave's address to bond
610 * @bond_dev: bond net device
611 * @slave_dev: slave net device
612 *
613 * Should be called with RTNL held.
614 */
615 static void bond_set_dev_addr(struct net_device *bond_dev,
616 struct net_device *slave_dev)
617 {
618 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
619 bond_dev, slave_dev, slave_dev->addr_len);
620 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
621 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
622 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
623 }
624
625 /* bond_do_fail_over_mac
626 *
627 * Perform special MAC address swapping for fail_over_mac settings
628 *
629 * Called with RTNL
630 */
631 static void bond_do_fail_over_mac(struct bonding *bond,
632 struct slave *new_active,
633 struct slave *old_active)
634 {
635 u8 tmp_mac[ETH_ALEN];
636 struct sockaddr saddr;
637 int rv;
638
639 switch (bond->params.fail_over_mac) {
640 case BOND_FOM_ACTIVE:
641 if (new_active)
642 bond_set_dev_addr(bond->dev, new_active->dev);
643 break;
644 case BOND_FOM_FOLLOW:
645 /* if new_active && old_active, swap them
646 * if just old_active, do nothing (going to no active slave)
647 * if just new_active, set new_active to bond's MAC
648 */
649 if (!new_active)
650 return;
651
652 if (old_active) {
653 ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
654 ether_addr_copy(saddr.sa_data,
655 old_active->dev->dev_addr);
656 saddr.sa_family = new_active->dev->type;
657 } else {
658 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
659 saddr.sa_family = bond->dev->type;
660 }
661
662 rv = dev_set_mac_address(new_active->dev, &saddr);
663 if (rv) {
664 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
665 -rv, new_active->dev->name);
666 goto out;
667 }
668
669 if (!old_active)
670 goto out;
671
672 ether_addr_copy(saddr.sa_data, tmp_mac);
673 saddr.sa_family = old_active->dev->type;
674
675 rv = dev_set_mac_address(old_active->dev, &saddr);
676 if (rv)
677 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
678 -rv, new_active->dev->name);
679 out:
680 break;
681 default:
682 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
683 bond->params.fail_over_mac);
684 break;
685 }
686
687 }
688
689 static bool bond_should_change_active(struct bonding *bond)
690 {
691 struct slave *prim = rtnl_dereference(bond->primary_slave);
692 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
693
694 if (!prim || !curr || curr->link != BOND_LINK_UP)
695 return true;
696 if (bond->force_primary) {
697 bond->force_primary = false;
698 return true;
699 }
700 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
701 (prim->speed < curr->speed ||
702 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
703 return false;
704 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
705 return false;
706 return true;
707 }
708
709 /**
710 * find_best_interface - select the best available slave to be the active one
711 * @bond: our bonding struct
712 */
713 static struct slave *bond_find_best_slave(struct bonding *bond)
714 {
715 struct slave *slave, *bestslave = NULL, *primary;
716 struct list_head *iter;
717 int mintime = bond->params.updelay;
718
719 primary = rtnl_dereference(bond->primary_slave);
720 if (primary && primary->link == BOND_LINK_UP &&
721 bond_should_change_active(bond))
722 return primary;
723
724 bond_for_each_slave(bond, slave, iter) {
725 if (slave->link == BOND_LINK_UP)
726 return slave;
727 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
728 slave->delay < mintime) {
729 mintime = slave->delay;
730 bestslave = slave;
731 }
732 }
733
734 return bestslave;
735 }
736
737 static bool bond_should_notify_peers(struct bonding *bond)
738 {
739 struct slave *slave;
740
741 rcu_read_lock();
742 slave = rcu_dereference(bond->curr_active_slave);
743 rcu_read_unlock();
744
745 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
746 slave ? slave->dev->name : "NULL");
747
748 if (!slave || !bond->send_peer_notif ||
749 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
750 return false;
751
752 return true;
753 }
754
755 /**
756 * change_active_interface - change the active slave into the specified one
757 * @bond: our bonding struct
758 * @new: the new slave to make the active one
759 *
760 * Set the new slave to the bond's settings and unset them on the old
761 * curr_active_slave.
762 * Setting include flags, mc-list, promiscuity, allmulti, etc.
763 *
764 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
765 * because it is apparently the best available slave we have, even though its
766 * updelay hasn't timed out yet.
767 *
768 * Caller must hold RTNL.
769 */
770 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
771 {
772 struct slave *old_active;
773
774 ASSERT_RTNL();
775
776 old_active = rtnl_dereference(bond->curr_active_slave);
777
778 if (old_active == new_active)
779 return;
780
781 if (new_active) {
782 new_active->last_link_up = jiffies;
783
784 if (new_active->link == BOND_LINK_BACK) {
785 if (bond_uses_primary(bond)) {
786 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
787 new_active->dev->name,
788 (bond->params.updelay - new_active->delay) * bond->params.miimon);
789 }
790
791 new_active->delay = 0;
792 new_active->link = BOND_LINK_UP;
793
794 if (BOND_MODE(bond) == BOND_MODE_8023AD)
795 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
796
797 if (bond_is_lb(bond))
798 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
799 } else {
800 if (bond_uses_primary(bond)) {
801 netdev_info(bond->dev, "making interface %s the new active one\n",
802 new_active->dev->name);
803 }
804 }
805 }
806
807 if (bond_uses_primary(bond))
808 bond_hw_addr_swap(bond, new_active, old_active);
809
810 if (bond_is_lb(bond)) {
811 bond_alb_handle_active_change(bond, new_active);
812 if (old_active)
813 bond_set_slave_inactive_flags(old_active,
814 BOND_SLAVE_NOTIFY_NOW);
815 if (new_active)
816 bond_set_slave_active_flags(new_active,
817 BOND_SLAVE_NOTIFY_NOW);
818 } else {
819 rcu_assign_pointer(bond->curr_active_slave, new_active);
820 }
821
822 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
823 if (old_active)
824 bond_set_slave_inactive_flags(old_active,
825 BOND_SLAVE_NOTIFY_NOW);
826
827 if (new_active) {
828 bool should_notify_peers = false;
829
830 bond_set_slave_active_flags(new_active,
831 BOND_SLAVE_NOTIFY_NOW);
832
833 if (bond->params.fail_over_mac)
834 bond_do_fail_over_mac(bond, new_active,
835 old_active);
836
837 if (netif_running(bond->dev)) {
838 bond->send_peer_notif =
839 bond->params.num_peer_notif;
840 should_notify_peers =
841 bond_should_notify_peers(bond);
842 }
843
844 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
845 if (should_notify_peers)
846 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
847 bond->dev);
848 }
849 }
850
851 /* resend IGMP joins since active slave has changed or
852 * all were sent on curr_active_slave.
853 * resend only if bond is brought up with the affected
854 * bonding modes and the retransmission is enabled
855 */
856 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
857 ((bond_uses_primary(bond) && new_active) ||
858 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
859 bond->igmp_retrans = bond->params.resend_igmp;
860 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
861 }
862 }
863
864 /**
865 * bond_select_active_slave - select a new active slave, if needed
866 * @bond: our bonding struct
867 *
868 * This functions should be called when one of the following occurs:
869 * - The old curr_active_slave has been released or lost its link.
870 * - The primary_slave has got its link back.
871 * - A slave has got its link back and there's no old curr_active_slave.
872 *
873 * Caller must hold RTNL.
874 */
875 void bond_select_active_slave(struct bonding *bond)
876 {
877 struct slave *best_slave;
878 int rv;
879
880 ASSERT_RTNL();
881
882 best_slave = bond_find_best_slave(bond);
883 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
884 bond_change_active_slave(bond, best_slave);
885 rv = bond_set_carrier(bond);
886 if (!rv)
887 return;
888
889 if (netif_carrier_ok(bond->dev)) {
890 netdev_info(bond->dev, "first active interface up!\n");
891 } else {
892 netdev_info(bond->dev, "now running without any active interface!\n");
893 }
894 }
895 }
896
897 #ifdef CONFIG_NET_POLL_CONTROLLER
898 static inline int slave_enable_netpoll(struct slave *slave)
899 {
900 struct netpoll *np;
901 int err = 0;
902
903 np = kzalloc(sizeof(*np), GFP_KERNEL);
904 err = -ENOMEM;
905 if (!np)
906 goto out;
907
908 err = __netpoll_setup(np, slave->dev);
909 if (err) {
910 kfree(np);
911 goto out;
912 }
913 slave->np = np;
914 out:
915 return err;
916 }
917 static inline void slave_disable_netpoll(struct slave *slave)
918 {
919 struct netpoll *np = slave->np;
920
921 if (!np)
922 return;
923
924 slave->np = NULL;
925 __netpoll_free_async(np);
926 }
927
928 static void bond_poll_controller(struct net_device *bond_dev)
929 {
930 }
931
932 static void bond_netpoll_cleanup(struct net_device *bond_dev)
933 {
934 struct bonding *bond = netdev_priv(bond_dev);
935 struct list_head *iter;
936 struct slave *slave;
937
938 bond_for_each_slave(bond, slave, iter)
939 if (bond_slave_is_up(slave))
940 slave_disable_netpoll(slave);
941 }
942
943 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
944 {
945 struct bonding *bond = netdev_priv(dev);
946 struct list_head *iter;
947 struct slave *slave;
948 int err = 0;
949
950 bond_for_each_slave(bond, slave, iter) {
951 err = slave_enable_netpoll(slave);
952 if (err) {
953 bond_netpoll_cleanup(dev);
954 break;
955 }
956 }
957 return err;
958 }
959 #else
960 static inline int slave_enable_netpoll(struct slave *slave)
961 {
962 return 0;
963 }
964 static inline void slave_disable_netpoll(struct slave *slave)
965 {
966 }
967 static void bond_netpoll_cleanup(struct net_device *bond_dev)
968 {
969 }
970 #endif
971
972 /*---------------------------------- IOCTL ----------------------------------*/
973
974 static netdev_features_t bond_fix_features(struct net_device *dev,
975 netdev_features_t features)
976 {
977 struct bonding *bond = netdev_priv(dev);
978 struct list_head *iter;
979 netdev_features_t mask;
980 struct slave *slave;
981
982 mask = features;
983 features &= ~NETIF_F_ONE_FOR_ALL;
984 features |= NETIF_F_ALL_FOR_ALL;
985
986 bond_for_each_slave(bond, slave, iter) {
987 features = netdev_increment_features(features,
988 slave->dev->features,
989 mask);
990 }
991 features = netdev_add_tso_features(features, mask);
992
993 return features;
994 }
995
996 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
997 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
998 NETIF_F_HIGHDMA | NETIF_F_LRO)
999
1000 #define BOND_ENC_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\
1001 NETIF_F_TSO | NETIF_F_GSO_UDP_TUNNEL)
1002
1003 static void bond_compute_features(struct bonding *bond)
1004 {
1005 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1006 IFF_XMIT_DST_RELEASE_PERM;
1007 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1008 netdev_features_t enc_features = BOND_ENC_FEATURES;
1009 struct net_device *bond_dev = bond->dev;
1010 struct list_head *iter;
1011 struct slave *slave;
1012 unsigned short max_hard_header_len = ETH_HLEN;
1013 unsigned int gso_max_size = GSO_MAX_SIZE;
1014 u16 gso_max_segs = GSO_MAX_SEGS;
1015
1016 if (!bond_has_slaves(bond))
1017 goto done;
1018 vlan_features &= NETIF_F_ALL_FOR_ALL;
1019
1020 bond_for_each_slave(bond, slave, iter) {
1021 vlan_features = netdev_increment_features(vlan_features,
1022 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1023
1024 enc_features = netdev_increment_features(enc_features,
1025 slave->dev->hw_enc_features,
1026 BOND_ENC_FEATURES);
1027 dst_release_flag &= slave->dev->priv_flags;
1028 if (slave->dev->hard_header_len > max_hard_header_len)
1029 max_hard_header_len = slave->dev->hard_header_len;
1030
1031 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1032 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1033 }
1034
1035 done:
1036 bond_dev->vlan_features = vlan_features;
1037 bond_dev->hw_enc_features = enc_features;
1038 bond_dev->hard_header_len = max_hard_header_len;
1039 bond_dev->gso_max_segs = gso_max_segs;
1040 netif_set_gso_max_size(bond_dev, gso_max_size);
1041
1042 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1043 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1044 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1045 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1046
1047 netdev_change_features(bond_dev);
1048 }
1049
1050 static void bond_setup_by_slave(struct net_device *bond_dev,
1051 struct net_device *slave_dev)
1052 {
1053 bond_dev->header_ops = slave_dev->header_ops;
1054
1055 bond_dev->type = slave_dev->type;
1056 bond_dev->hard_header_len = slave_dev->hard_header_len;
1057 bond_dev->addr_len = slave_dev->addr_len;
1058
1059 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1060 slave_dev->addr_len);
1061 }
1062
1063 /* On bonding slaves other than the currently active slave, suppress
1064 * duplicates except for alb non-mcast/bcast.
1065 */
1066 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1067 struct slave *slave,
1068 struct bonding *bond)
1069 {
1070 if (bond_is_slave_inactive(slave)) {
1071 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1072 skb->pkt_type != PACKET_BROADCAST &&
1073 skb->pkt_type != PACKET_MULTICAST)
1074 return false;
1075 return true;
1076 }
1077 return false;
1078 }
1079
1080 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1081 {
1082 struct sk_buff *skb = *pskb;
1083 struct slave *slave;
1084 struct bonding *bond;
1085 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1086 struct slave *);
1087 int ret = RX_HANDLER_ANOTHER;
1088
1089 skb = skb_share_check(skb, GFP_ATOMIC);
1090 if (unlikely(!skb))
1091 return RX_HANDLER_CONSUMED;
1092
1093 *pskb = skb;
1094
1095 slave = bond_slave_get_rcu(skb->dev);
1096 bond = slave->bond;
1097
1098 recv_probe = ACCESS_ONCE(bond->recv_probe);
1099 if (recv_probe) {
1100 ret = recv_probe(skb, bond, slave);
1101 if (ret == RX_HANDLER_CONSUMED) {
1102 consume_skb(skb);
1103 return ret;
1104 }
1105 }
1106
1107 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1108 return RX_HANDLER_EXACT;
1109 }
1110
1111 skb->dev = bond->dev;
1112
1113 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1114 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1115 skb->pkt_type == PACKET_HOST) {
1116
1117 if (unlikely(skb_cow_head(skb,
1118 skb->data - skb_mac_header(skb)))) {
1119 kfree_skb(skb);
1120 return RX_HANDLER_CONSUMED;
1121 }
1122 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1123 }
1124
1125 return ret;
1126 }
1127
1128 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1129 struct net_device *slave_dev,
1130 struct slave *slave)
1131 {
1132 int err;
1133
1134 err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1135 if (err)
1136 return err;
1137 slave_dev->flags |= IFF_SLAVE;
1138 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1139 return 0;
1140 }
1141
1142 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1143 struct net_device *slave_dev)
1144 {
1145 netdev_upper_dev_unlink(slave_dev, bond_dev);
1146 slave_dev->flags &= ~IFF_SLAVE;
1147 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1148 }
1149
1150 static struct slave *bond_alloc_slave(struct bonding *bond)
1151 {
1152 struct slave *slave = NULL;
1153
1154 slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1155 if (!slave)
1156 return NULL;
1157
1158 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1159 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1160 GFP_KERNEL);
1161 if (!SLAVE_AD_INFO(slave)) {
1162 kfree(slave);
1163 return NULL;
1164 }
1165 }
1166 return slave;
1167 }
1168
1169 static void bond_free_slave(struct slave *slave)
1170 {
1171 struct bonding *bond = bond_get_bond_by_slave(slave);
1172
1173 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1174 kfree(SLAVE_AD_INFO(slave));
1175
1176 kfree(slave);
1177 }
1178
1179 /* enslave device <slave> to bond device <master> */
1180 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1181 {
1182 struct bonding *bond = netdev_priv(bond_dev);
1183 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1184 struct slave *new_slave = NULL, *prev_slave;
1185 struct sockaddr addr;
1186 int link_reporting;
1187 int res = 0, i;
1188
1189 if (!bond->params.use_carrier &&
1190 slave_dev->ethtool_ops->get_link == NULL &&
1191 slave_ops->ndo_do_ioctl == NULL) {
1192 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1193 slave_dev->name);
1194 }
1195
1196 /* already enslaved */
1197 if (slave_dev->flags & IFF_SLAVE) {
1198 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1199 return -EBUSY;
1200 }
1201
1202 if (bond_dev == slave_dev) {
1203 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1204 return -EPERM;
1205 }
1206
1207 /* vlan challenged mutual exclusion */
1208 /* no need to lock since we're protected by rtnl_lock */
1209 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1210 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1211 slave_dev->name);
1212 if (vlan_uses_dev(bond_dev)) {
1213 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1214 slave_dev->name, bond_dev->name);
1215 return -EPERM;
1216 } else {
1217 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1218 slave_dev->name, slave_dev->name,
1219 bond_dev->name);
1220 }
1221 } else {
1222 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1223 slave_dev->name);
1224 }
1225
1226 /* Old ifenslave binaries are no longer supported. These can
1227 * be identified with moderate accuracy by the state of the slave:
1228 * the current ifenslave will set the interface down prior to
1229 * enslaving it; the old ifenslave will not.
1230 */
1231 if ((slave_dev->flags & IFF_UP)) {
1232 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1233 slave_dev->name);
1234 res = -EPERM;
1235 goto err_undo_flags;
1236 }
1237
1238 /* set bonding device ether type by slave - bonding netdevices are
1239 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1240 * there is a need to override some of the type dependent attribs/funcs.
1241 *
1242 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1243 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1244 */
1245 if (!bond_has_slaves(bond)) {
1246 if (bond_dev->type != slave_dev->type) {
1247 netdev_dbg(bond_dev, "change device type from %d to %d\n",
1248 bond_dev->type, slave_dev->type);
1249
1250 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1251 bond_dev);
1252 res = notifier_to_errno(res);
1253 if (res) {
1254 netdev_err(bond_dev, "refused to change device type\n");
1255 res = -EBUSY;
1256 goto err_undo_flags;
1257 }
1258
1259 /* Flush unicast and multicast addresses */
1260 dev_uc_flush(bond_dev);
1261 dev_mc_flush(bond_dev);
1262
1263 if (slave_dev->type != ARPHRD_ETHER)
1264 bond_setup_by_slave(bond_dev, slave_dev);
1265 else {
1266 ether_setup(bond_dev);
1267 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1268 }
1269
1270 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1271 bond_dev);
1272 }
1273 } else if (bond_dev->type != slave_dev->type) {
1274 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1275 slave_dev->name, slave_dev->type, bond_dev->type);
1276 res = -EINVAL;
1277 goto err_undo_flags;
1278 }
1279
1280 if (slave_ops->ndo_set_mac_address == NULL) {
1281 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1282 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1283 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1284 if (!bond_has_slaves(bond)) {
1285 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1286 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1287 } else {
1288 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");
1289 res = -EOPNOTSUPP;
1290 goto err_undo_flags;
1291 }
1292 }
1293 }
1294
1295 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1296
1297 /* If this is the first slave, then we need to set the master's hardware
1298 * address to be the same as the slave's.
1299 */
1300 if (!bond_has_slaves(bond) &&
1301 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1302 bond_set_dev_addr(bond->dev, slave_dev);
1303
1304 new_slave = bond_alloc_slave(bond);
1305 if (!new_slave) {
1306 res = -ENOMEM;
1307 goto err_undo_flags;
1308 }
1309
1310 new_slave->bond = bond;
1311 new_slave->dev = slave_dev;
1312 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1313 * is set via sysfs or module option if desired.
1314 */
1315 new_slave->queue_id = 0;
1316
1317 /* Save slave's original mtu and then set it to match the bond */
1318 new_slave->original_mtu = slave_dev->mtu;
1319 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1320 if (res) {
1321 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1322 goto err_free;
1323 }
1324
1325 /* Save slave's original ("permanent") mac address for modes
1326 * that need it, and for restoring it upon release, and then
1327 * set it to the master's address
1328 */
1329 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1330
1331 if (!bond->params.fail_over_mac ||
1332 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1333 /* Set slave to master's mac address. The application already
1334 * set the master's mac address to that of the first slave
1335 */
1336 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1337 addr.sa_family = slave_dev->type;
1338 res = dev_set_mac_address(slave_dev, &addr);
1339 if (res) {
1340 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1341 goto err_restore_mtu;
1342 }
1343 }
1344
1345 /* open the slave since the application closed it */
1346 res = dev_open(slave_dev);
1347 if (res) {
1348 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1349 goto err_restore_mac;
1350 }
1351
1352 slave_dev->priv_flags |= IFF_BONDING;
1353 /* initialize slave stats */
1354 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1355
1356 if (bond_is_lb(bond)) {
1357 /* bond_alb_init_slave() must be called before all other stages since
1358 * it might fail and we do not want to have to undo everything
1359 */
1360 res = bond_alb_init_slave(bond, new_slave);
1361 if (res)
1362 goto err_close;
1363 }
1364
1365 /* If the mode uses primary, then the following is handled by
1366 * bond_change_active_slave().
1367 */
1368 if (!bond_uses_primary(bond)) {
1369 /* set promiscuity level to new slave */
1370 if (bond_dev->flags & IFF_PROMISC) {
1371 res = dev_set_promiscuity(slave_dev, 1);
1372 if (res)
1373 goto err_close;
1374 }
1375
1376 /* set allmulti level to new slave */
1377 if (bond_dev->flags & IFF_ALLMULTI) {
1378 res = dev_set_allmulti(slave_dev, 1);
1379 if (res)
1380 goto err_close;
1381 }
1382
1383 netif_addr_lock_bh(bond_dev);
1384
1385 dev_mc_sync_multiple(slave_dev, bond_dev);
1386 dev_uc_sync_multiple(slave_dev, bond_dev);
1387
1388 netif_addr_unlock_bh(bond_dev);
1389 }
1390
1391 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1392 /* add lacpdu mc addr to mc list */
1393 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1394
1395 dev_mc_add(slave_dev, lacpdu_multicast);
1396 }
1397
1398 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1399 if (res) {
1400 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1401 slave_dev->name);
1402 goto err_close;
1403 }
1404
1405 prev_slave = bond_last_slave(bond);
1406
1407 new_slave->delay = 0;
1408 new_slave->link_failure_count = 0;
1409
1410 bond_update_speed_duplex(new_slave);
1411
1412 new_slave->last_rx = jiffies -
1413 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1414 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1415 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1416
1417 if (bond->params.miimon && !bond->params.use_carrier) {
1418 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1419
1420 if ((link_reporting == -1) && !bond->params.arp_interval) {
1421 /* miimon is set but a bonded network driver
1422 * does not support ETHTOOL/MII and
1423 * arp_interval is not set. Note: if
1424 * use_carrier is enabled, we will never go
1425 * here (because netif_carrier is always
1426 * supported); thus, we don't need to change
1427 * the messages for netif_carrier.
1428 */
1429 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",
1430 slave_dev->name);
1431 } else if (link_reporting == -1) {
1432 /* unable get link status using mii/ethtool */
1433 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",
1434 slave_dev->name);
1435 }
1436 }
1437
1438 /* check for initial state */
1439 if (bond->params.miimon) {
1440 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1441 if (bond->params.updelay) {
1442 new_slave->link = BOND_LINK_BACK;
1443 new_slave->delay = bond->params.updelay;
1444 } else {
1445 new_slave->link = BOND_LINK_UP;
1446 }
1447 } else {
1448 new_slave->link = BOND_LINK_DOWN;
1449 }
1450 } else if (bond->params.arp_interval) {
1451 new_slave->link = (netif_carrier_ok(slave_dev) ?
1452 BOND_LINK_UP : BOND_LINK_DOWN);
1453 } else {
1454 new_slave->link = BOND_LINK_UP;
1455 }
1456
1457 if (new_slave->link != BOND_LINK_DOWN)
1458 new_slave->last_link_up = jiffies;
1459 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1460 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1461 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1462
1463 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1464 /* if there is a primary slave, remember it */
1465 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1466 rcu_assign_pointer(bond->primary_slave, new_slave);
1467 bond->force_primary = true;
1468 }
1469 }
1470
1471 switch (BOND_MODE(bond)) {
1472 case BOND_MODE_ACTIVEBACKUP:
1473 bond_set_slave_inactive_flags(new_slave,
1474 BOND_SLAVE_NOTIFY_NOW);
1475 break;
1476 case BOND_MODE_8023AD:
1477 /* in 802.3ad mode, the internal mechanism
1478 * will activate the slaves in the selected
1479 * aggregator
1480 */
1481 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1482 /* if this is the first slave */
1483 if (!prev_slave) {
1484 SLAVE_AD_INFO(new_slave)->id = 1;
1485 /* Initialize AD with the number of times that the AD timer is called in 1 second
1486 * can be called only after the mac address of the bond is set
1487 */
1488 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1489 } else {
1490 SLAVE_AD_INFO(new_slave)->id =
1491 SLAVE_AD_INFO(prev_slave)->id + 1;
1492 }
1493
1494 bond_3ad_bind_slave(new_slave);
1495 break;
1496 case BOND_MODE_TLB:
1497 case BOND_MODE_ALB:
1498 bond_set_active_slave(new_slave);
1499 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1500 break;
1501 default:
1502 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1503
1504 /* always active in trunk mode */
1505 bond_set_active_slave(new_slave);
1506
1507 /* In trunking mode there is little meaning to curr_active_slave
1508 * anyway (it holds no special properties of the bond device),
1509 * so we can change it without calling change_active_interface()
1510 */
1511 if (!rcu_access_pointer(bond->curr_active_slave) &&
1512 new_slave->link == BOND_LINK_UP)
1513 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1514
1515 break;
1516 } /* switch(bond_mode) */
1517
1518 #ifdef CONFIG_NET_POLL_CONTROLLER
1519 slave_dev->npinfo = bond->dev->npinfo;
1520 if (slave_dev->npinfo) {
1521 if (slave_enable_netpoll(new_slave)) {
1522 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1523 res = -EBUSY;
1524 goto err_detach;
1525 }
1526 }
1527 #endif
1528
1529 if (!(bond_dev->features & NETIF_F_LRO))
1530 dev_disable_lro(slave_dev);
1531
1532 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1533 new_slave);
1534 if (res) {
1535 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1536 goto err_detach;
1537 }
1538
1539 res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1540 if (res) {
1541 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1542 goto err_unregister;
1543 }
1544
1545 res = bond_sysfs_slave_add(new_slave);
1546 if (res) {
1547 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1548 goto err_upper_unlink;
1549 }
1550
1551 bond->slave_cnt++;
1552 bond_compute_features(bond);
1553 bond_set_carrier(bond);
1554
1555 if (bond_uses_primary(bond)) {
1556 block_netpoll_tx();
1557 bond_select_active_slave(bond);
1558 unblock_netpoll_tx();
1559 }
1560
1561 if (bond_mode_uses_xmit_hash(bond))
1562 bond_update_slave_arr(bond, NULL);
1563
1564 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1565 slave_dev->name,
1566 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1567 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1568
1569 /* enslave is successful */
1570 return 0;
1571
1572 /* Undo stages on error */
1573 err_upper_unlink:
1574 bond_upper_dev_unlink(bond_dev, slave_dev);
1575
1576 err_unregister:
1577 netdev_rx_handler_unregister(slave_dev);
1578
1579 err_detach:
1580 if (!bond_uses_primary(bond))
1581 bond_hw_addr_flush(bond_dev, slave_dev);
1582
1583 vlan_vids_del_by_dev(slave_dev, bond_dev);
1584 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1585 RCU_INIT_POINTER(bond->primary_slave, NULL);
1586 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1587 block_netpoll_tx();
1588 bond_change_active_slave(bond, NULL);
1589 bond_select_active_slave(bond);
1590 unblock_netpoll_tx();
1591 }
1592 /* either primary_slave or curr_active_slave might've changed */
1593 synchronize_rcu();
1594 slave_disable_netpoll(new_slave);
1595
1596 err_close:
1597 slave_dev->priv_flags &= ~IFF_BONDING;
1598 dev_close(slave_dev);
1599
1600 err_restore_mac:
1601 if (!bond->params.fail_over_mac ||
1602 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1603 /* XXX TODO - fom follow mode needs to change master's
1604 * MAC if this slave's MAC is in use by the bond, or at
1605 * least print a warning.
1606 */
1607 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1608 addr.sa_family = slave_dev->type;
1609 dev_set_mac_address(slave_dev, &addr);
1610 }
1611
1612 err_restore_mtu:
1613 dev_set_mtu(slave_dev, new_slave->original_mtu);
1614
1615 err_free:
1616 bond_free_slave(new_slave);
1617
1618 err_undo_flags:
1619 /* Enslave of first slave has failed and we need to fix master's mac */
1620 if (!bond_has_slaves(bond) &&
1621 ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
1622 eth_hw_addr_random(bond_dev);
1623
1624 return res;
1625 }
1626
1627 /* Try to release the slave device <slave> from the bond device <master>
1628 * It is legal to access curr_active_slave without a lock because all the function
1629 * is RTNL-locked. If "all" is true it means that the function is being called
1630 * while destroying a bond interface and all slaves are being released.
1631 *
1632 * The rules for slave state should be:
1633 * for Active/Backup:
1634 * Active stays on all backups go down
1635 * for Bonded connections:
1636 * The first up interface should be left on and all others downed.
1637 */
1638 static int __bond_release_one(struct net_device *bond_dev,
1639 struct net_device *slave_dev,
1640 bool all)
1641 {
1642 struct bonding *bond = netdev_priv(bond_dev);
1643 struct slave *slave, *oldcurrent;
1644 struct sockaddr addr;
1645 int old_flags = bond_dev->flags;
1646 netdev_features_t old_features = bond_dev->features;
1647
1648 /* slave is not a slave or master is not master of this slave */
1649 if (!(slave_dev->flags & IFF_SLAVE) ||
1650 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1651 netdev_err(bond_dev, "cannot release %s\n",
1652 slave_dev->name);
1653 return -EINVAL;
1654 }
1655
1656 block_netpoll_tx();
1657
1658 slave = bond_get_slave_by_dev(bond, slave_dev);
1659 if (!slave) {
1660 /* not a slave of this bond */
1661 netdev_info(bond_dev, "%s not enslaved\n",
1662 slave_dev->name);
1663 unblock_netpoll_tx();
1664 return -EINVAL;
1665 }
1666
1667 bond_sysfs_slave_del(slave);
1668
1669 /* recompute stats just before removing the slave */
1670 bond_get_stats(bond->dev, &bond->bond_stats);
1671
1672 bond_upper_dev_unlink(bond_dev, slave_dev);
1673 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1674 * for this slave anymore.
1675 */
1676 netdev_rx_handler_unregister(slave_dev);
1677
1678 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1679 bond_3ad_unbind_slave(slave);
1680
1681 if (bond_mode_uses_xmit_hash(bond))
1682 bond_update_slave_arr(bond, slave);
1683
1684 netdev_info(bond_dev, "Releasing %s interface %s\n",
1685 bond_is_active_slave(slave) ? "active" : "backup",
1686 slave_dev->name);
1687
1688 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1689
1690 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1691
1692 if (!all && (!bond->params.fail_over_mac ||
1693 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1694 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1695 bond_has_slaves(bond))
1696 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",
1697 slave_dev->name, slave->perm_hwaddr,
1698 bond_dev->name, slave_dev->name);
1699 }
1700
1701 if (rtnl_dereference(bond->primary_slave) == slave)
1702 RCU_INIT_POINTER(bond->primary_slave, NULL);
1703
1704 if (oldcurrent == slave)
1705 bond_change_active_slave(bond, NULL);
1706
1707 if (bond_is_lb(bond)) {
1708 /* Must be called only after the slave has been
1709 * detached from the list and the curr_active_slave
1710 * has been cleared (if our_slave == old_current),
1711 * but before a new active slave is selected.
1712 */
1713 bond_alb_deinit_slave(bond, slave);
1714 }
1715
1716 if (all) {
1717 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1718 } else if (oldcurrent == slave) {
1719 /* Note that we hold RTNL over this sequence, so there
1720 * is no concern that another slave add/remove event
1721 * will interfere.
1722 */
1723 bond_select_active_slave(bond);
1724 }
1725
1726 if (!bond_has_slaves(bond)) {
1727 bond_set_carrier(bond);
1728 eth_hw_addr_random(bond_dev);
1729 }
1730
1731 unblock_netpoll_tx();
1732 synchronize_rcu();
1733 bond->slave_cnt--;
1734
1735 if (!bond_has_slaves(bond)) {
1736 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1737 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1738 }
1739
1740 bond_compute_features(bond);
1741 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1742 (old_features & NETIF_F_VLAN_CHALLENGED))
1743 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1744 slave_dev->name, bond_dev->name);
1745
1746 vlan_vids_del_by_dev(slave_dev, bond_dev);
1747
1748 /* If the mode uses primary, then this case was handled above by
1749 * bond_change_active_slave(..., NULL)
1750 */
1751 if (!bond_uses_primary(bond)) {
1752 /* unset promiscuity level from slave
1753 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1754 * of the IFF_PROMISC flag in the bond_dev, but we need the
1755 * value of that flag before that change, as that was the value
1756 * when this slave was attached, so we cache at the start of the
1757 * function and use it here. Same goes for ALLMULTI below
1758 */
1759 if (old_flags & IFF_PROMISC)
1760 dev_set_promiscuity(slave_dev, -1);
1761
1762 /* unset allmulti level from slave */
1763 if (old_flags & IFF_ALLMULTI)
1764 dev_set_allmulti(slave_dev, -1);
1765
1766 bond_hw_addr_flush(bond_dev, slave_dev);
1767 }
1768
1769 slave_disable_netpoll(slave);
1770
1771 /* close slave before restoring its mac address */
1772 dev_close(slave_dev);
1773
1774 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1775 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1776 /* restore original ("permanent") mac address */
1777 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1778 addr.sa_family = slave_dev->type;
1779 dev_set_mac_address(slave_dev, &addr);
1780 }
1781
1782 dev_set_mtu(slave_dev, slave->original_mtu);
1783
1784 slave_dev->priv_flags &= ~IFF_BONDING;
1785
1786 bond_free_slave(slave);
1787
1788 return 0;
1789 }
1790
1791 /* A wrapper used because of ndo_del_link */
1792 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1793 {
1794 return __bond_release_one(bond_dev, slave_dev, false);
1795 }
1796
1797 /* First release a slave and then destroy the bond if no more slaves are left.
1798 * Must be under rtnl_lock when this function is called.
1799 */
1800 static int bond_release_and_destroy(struct net_device *bond_dev,
1801 struct net_device *slave_dev)
1802 {
1803 struct bonding *bond = netdev_priv(bond_dev);
1804 int ret;
1805
1806 ret = bond_release(bond_dev, slave_dev);
1807 if (ret == 0 && !bond_has_slaves(bond)) {
1808 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1809 netdev_info(bond_dev, "Destroying bond %s\n",
1810 bond_dev->name);
1811 unregister_netdevice(bond_dev);
1812 }
1813 return ret;
1814 }
1815
1816 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1817 {
1818 struct bonding *bond = netdev_priv(bond_dev);
1819
1820 info->bond_mode = BOND_MODE(bond);
1821 info->miimon = bond->params.miimon;
1822 info->num_slaves = bond->slave_cnt;
1823
1824 return 0;
1825 }
1826
1827 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1828 {
1829 struct bonding *bond = netdev_priv(bond_dev);
1830 struct list_head *iter;
1831 int i = 0, res = -ENODEV;
1832 struct slave *slave;
1833
1834 bond_for_each_slave(bond, slave, iter) {
1835 if (i++ == (int)info->slave_id) {
1836 res = 0;
1837 strcpy(info->slave_name, slave->dev->name);
1838 info->link = slave->link;
1839 info->state = bond_slave_state(slave);
1840 info->link_failure_count = slave->link_failure_count;
1841 break;
1842 }
1843 }
1844
1845 return res;
1846 }
1847
1848 /*-------------------------------- Monitoring -------------------------------*/
1849
1850 /* called with rcu_read_lock() */
1851 static int bond_miimon_inspect(struct bonding *bond)
1852 {
1853 int link_state, commit = 0;
1854 struct list_head *iter;
1855 struct slave *slave;
1856 bool ignore_updelay;
1857
1858 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
1859
1860 bond_for_each_slave_rcu(bond, slave, iter) {
1861 slave->new_link = BOND_LINK_NOCHANGE;
1862
1863 link_state = bond_check_dev_link(bond, slave->dev, 0);
1864
1865 switch (slave->link) {
1866 case BOND_LINK_UP:
1867 if (link_state)
1868 continue;
1869
1870 slave->link = BOND_LINK_FAIL;
1871 slave->delay = bond->params.downdelay;
1872 if (slave->delay) {
1873 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
1874 (BOND_MODE(bond) ==
1875 BOND_MODE_ACTIVEBACKUP) ?
1876 (bond_is_active_slave(slave) ?
1877 "active " : "backup ") : "",
1878 slave->dev->name,
1879 bond->params.downdelay * bond->params.miimon);
1880 }
1881 /*FALLTHRU*/
1882 case BOND_LINK_FAIL:
1883 if (link_state) {
1884 /* recovered before downdelay expired */
1885 slave->link = BOND_LINK_UP;
1886 slave->last_link_up = jiffies;
1887 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
1888 (bond->params.downdelay - slave->delay) *
1889 bond->params.miimon,
1890 slave->dev->name);
1891 continue;
1892 }
1893
1894 if (slave->delay <= 0) {
1895 slave->new_link = BOND_LINK_DOWN;
1896 commit++;
1897 continue;
1898 }
1899
1900 slave->delay--;
1901 break;
1902
1903 case BOND_LINK_DOWN:
1904 if (!link_state)
1905 continue;
1906
1907 slave->link = BOND_LINK_BACK;
1908 slave->delay = bond->params.updelay;
1909
1910 if (slave->delay) {
1911 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
1912 slave->dev->name,
1913 ignore_updelay ? 0 :
1914 bond->params.updelay *
1915 bond->params.miimon);
1916 }
1917 /*FALLTHRU*/
1918 case BOND_LINK_BACK:
1919 if (!link_state) {
1920 slave->link = BOND_LINK_DOWN;
1921 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
1922 (bond->params.updelay - slave->delay) *
1923 bond->params.miimon,
1924 slave->dev->name);
1925
1926 continue;
1927 }
1928
1929 if (ignore_updelay)
1930 slave->delay = 0;
1931
1932 if (slave->delay <= 0) {
1933 slave->new_link = BOND_LINK_UP;
1934 commit++;
1935 ignore_updelay = false;
1936 continue;
1937 }
1938
1939 slave->delay--;
1940 break;
1941 }
1942 }
1943
1944 return commit;
1945 }
1946
1947 static void bond_miimon_commit(struct bonding *bond)
1948 {
1949 struct list_head *iter;
1950 struct slave *slave, *primary;
1951
1952 bond_for_each_slave(bond, slave, iter) {
1953 switch (slave->new_link) {
1954 case BOND_LINK_NOCHANGE:
1955 continue;
1956
1957 case BOND_LINK_UP:
1958 slave->link = BOND_LINK_UP;
1959 slave->last_link_up = jiffies;
1960
1961 primary = rtnl_dereference(bond->primary_slave);
1962 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1963 /* prevent it from being the active one */
1964 bond_set_backup_slave(slave);
1965 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1966 /* make it immediately active */
1967 bond_set_active_slave(slave);
1968 } else if (slave != primary) {
1969 /* prevent it from being the active one */
1970 bond_set_backup_slave(slave);
1971 }
1972
1973 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
1974 slave->dev->name,
1975 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
1976 slave->duplex ? "full" : "half");
1977
1978 /* notify ad that the link status has changed */
1979 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1980 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
1981
1982 if (bond_is_lb(bond))
1983 bond_alb_handle_link_change(bond, slave,
1984 BOND_LINK_UP);
1985
1986 if (BOND_MODE(bond) == BOND_MODE_XOR)
1987 bond_update_slave_arr(bond, NULL);
1988
1989 if (!bond->curr_active_slave || slave == primary)
1990 goto do_failover;
1991
1992 continue;
1993
1994 case BOND_LINK_DOWN:
1995 if (slave->link_failure_count < UINT_MAX)
1996 slave->link_failure_count++;
1997
1998 slave->link = BOND_LINK_DOWN;
1999
2000 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2001 BOND_MODE(bond) == BOND_MODE_8023AD)
2002 bond_set_slave_inactive_flags(slave,
2003 BOND_SLAVE_NOTIFY_NOW);
2004
2005 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2006 slave->dev->name);
2007
2008 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2009 bond_3ad_handle_link_change(slave,
2010 BOND_LINK_DOWN);
2011
2012 if (bond_is_lb(bond))
2013 bond_alb_handle_link_change(bond, slave,
2014 BOND_LINK_DOWN);
2015
2016 if (BOND_MODE(bond) == BOND_MODE_XOR)
2017 bond_update_slave_arr(bond, NULL);
2018
2019 if (slave == rcu_access_pointer(bond->curr_active_slave))
2020 goto do_failover;
2021
2022 continue;
2023
2024 default:
2025 netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2026 slave->new_link, slave->dev->name);
2027 slave->new_link = BOND_LINK_NOCHANGE;
2028
2029 continue;
2030 }
2031
2032 do_failover:
2033 block_netpoll_tx();
2034 bond_select_active_slave(bond);
2035 unblock_netpoll_tx();
2036 }
2037
2038 bond_set_carrier(bond);
2039 }
2040
2041 /* bond_mii_monitor
2042 *
2043 * Really a wrapper that splits the mii monitor into two phases: an
2044 * inspection, then (if inspection indicates something needs to be done)
2045 * an acquisition of appropriate locks followed by a commit phase to
2046 * implement whatever link state changes are indicated.
2047 */
2048 static void bond_mii_monitor(struct work_struct *work)
2049 {
2050 struct bonding *bond = container_of(work, struct bonding,
2051 mii_work.work);
2052 bool should_notify_peers = false;
2053 unsigned long delay;
2054
2055 delay = msecs_to_jiffies(bond->params.miimon);
2056
2057 if (!bond_has_slaves(bond))
2058 goto re_arm;
2059
2060 rcu_read_lock();
2061
2062 should_notify_peers = bond_should_notify_peers(bond);
2063
2064 if (bond_miimon_inspect(bond)) {
2065 rcu_read_unlock();
2066
2067 /* Race avoidance with bond_close cancel of workqueue */
2068 if (!rtnl_trylock()) {
2069 delay = 1;
2070 should_notify_peers = false;
2071 goto re_arm;
2072 }
2073
2074 bond_miimon_commit(bond);
2075
2076 rtnl_unlock(); /* might sleep, hold no other locks */
2077 } else
2078 rcu_read_unlock();
2079
2080 re_arm:
2081 if (bond->params.miimon)
2082 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2083
2084 if (should_notify_peers) {
2085 if (!rtnl_trylock())
2086 return;
2087 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2088 rtnl_unlock();
2089 }
2090 }
2091
2092 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2093 {
2094 struct net_device *upper;
2095 struct list_head *iter;
2096 bool ret = false;
2097
2098 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2099 return true;
2100
2101 rcu_read_lock();
2102 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2103 if (ip == bond_confirm_addr(upper, 0, ip)) {
2104 ret = true;
2105 break;
2106 }
2107 }
2108 rcu_read_unlock();
2109
2110 return ret;
2111 }
2112
2113 /* We go to the (large) trouble of VLAN tagging ARP frames because
2114 * switches in VLAN mode (especially if ports are configured as
2115 * "native" to a VLAN) might not pass non-tagged frames.
2116 */
2117 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2118 __be32 dest_ip, __be32 src_ip,
2119 struct bond_vlan_tag *tags)
2120 {
2121 struct sk_buff *skb;
2122 struct bond_vlan_tag *outer_tag = tags;
2123
2124 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2125 arp_op, slave_dev->name, &dest_ip, &src_ip);
2126
2127 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2128 NULL, slave_dev->dev_addr, NULL);
2129
2130 if (!skb) {
2131 net_err_ratelimited("ARP packet allocation failed\n");
2132 return;
2133 }
2134
2135 if (!tags || tags->vlan_proto == VLAN_N_VID)
2136 goto xmit;
2137
2138 tags++;
2139
2140 /* Go through all the tags backwards and add them to the packet */
2141 while (tags->vlan_proto != VLAN_N_VID) {
2142 if (!tags->vlan_id) {
2143 tags++;
2144 continue;
2145 }
2146
2147 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2148 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2149 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2150 tags->vlan_id);
2151 if (!skb) {
2152 net_err_ratelimited("failed to insert inner VLAN tag\n");
2153 return;
2154 }
2155
2156 tags++;
2157 }
2158 /* Set the outer tag */
2159 if (outer_tag->vlan_id) {
2160 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2161 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2162 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2163 outer_tag->vlan_id);
2164 }
2165
2166 xmit:
2167 arp_xmit(skb);
2168 }
2169
2170 /* Validate the device path between the @start_dev and the @end_dev.
2171 * The path is valid if the @end_dev is reachable through device
2172 * stacking.
2173 * When the path is validated, collect any vlan information in the
2174 * path.
2175 */
2176 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2177 struct net_device *end_dev,
2178 int level)
2179 {
2180 struct bond_vlan_tag *tags;
2181 struct net_device *upper;
2182 struct list_head *iter;
2183
2184 if (start_dev == end_dev) {
2185 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2186 if (!tags)
2187 return ERR_PTR(-ENOMEM);
2188 tags[level].vlan_proto = VLAN_N_VID;
2189 return tags;
2190 }
2191
2192 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2193 tags = bond_verify_device_path(upper, end_dev, level + 1);
2194 if (IS_ERR_OR_NULL(tags)) {
2195 if (IS_ERR(tags))
2196 return tags;
2197 continue;
2198 }
2199 if (is_vlan_dev(upper)) {
2200 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2201 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2202 }
2203
2204 return tags;
2205 }
2206
2207 return NULL;
2208 }
2209
2210 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2211 {
2212 struct rtable *rt;
2213 struct bond_vlan_tag *tags;
2214 __be32 *targets = bond->params.arp_targets, addr;
2215 int i;
2216
2217 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2218 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2219 tags = NULL;
2220
2221 /* Find out through which dev should the packet go */
2222 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2223 RTO_ONLINK, 0);
2224 if (IS_ERR(rt)) {
2225 /* there's no route to target - try to send arp
2226 * probe to generate any traffic (arp_validate=0)
2227 */
2228 if (bond->params.arp_validate)
2229 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2230 bond->dev->name,
2231 &targets[i]);
2232 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2233 0, tags);
2234 continue;
2235 }
2236
2237 /* bond device itself */
2238 if (rt->dst.dev == bond->dev)
2239 goto found;
2240
2241 rcu_read_lock();
2242 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2243 rcu_read_unlock();
2244
2245 if (!IS_ERR_OR_NULL(tags))
2246 goto found;
2247
2248 /* Not our device - skip */
2249 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2250 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2251
2252 ip_rt_put(rt);
2253 continue;
2254
2255 found:
2256 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2257 ip_rt_put(rt);
2258 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2259 addr, tags);
2260 kfree(tags);
2261 }
2262 }
2263
2264 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2265 {
2266 int i;
2267
2268 if (!sip || !bond_has_this_ip(bond, tip)) {
2269 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2270 &sip, &tip);
2271 return;
2272 }
2273
2274 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2275 if (i == -1) {
2276 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2277 &sip);
2278 return;
2279 }
2280 slave->last_rx = jiffies;
2281 slave->target_last_arp_rx[i] = jiffies;
2282 }
2283
2284 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2285 struct slave *slave)
2286 {
2287 struct arphdr *arp = (struct arphdr *)skb->data;
2288 struct slave *curr_active_slave;
2289 unsigned char *arp_ptr;
2290 __be32 sip, tip;
2291 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2292
2293 if (!slave_do_arp_validate(bond, slave)) {
2294 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2295 !slave_do_arp_validate_only(bond))
2296 slave->last_rx = jiffies;
2297 return RX_HANDLER_ANOTHER;
2298 } else if (!is_arp) {
2299 return RX_HANDLER_ANOTHER;
2300 }
2301
2302 alen = arp_hdr_len(bond->dev);
2303
2304 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2305 skb->dev->name);
2306
2307 if (alen > skb_headlen(skb)) {
2308 arp = kmalloc(alen, GFP_ATOMIC);
2309 if (!arp)
2310 goto out_unlock;
2311 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2312 goto out_unlock;
2313 }
2314
2315 if (arp->ar_hln != bond->dev->addr_len ||
2316 skb->pkt_type == PACKET_OTHERHOST ||
2317 skb->pkt_type == PACKET_LOOPBACK ||
2318 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2319 arp->ar_pro != htons(ETH_P_IP) ||
2320 arp->ar_pln != 4)
2321 goto out_unlock;
2322
2323 arp_ptr = (unsigned char *)(arp + 1);
2324 arp_ptr += bond->dev->addr_len;
2325 memcpy(&sip, arp_ptr, 4);
2326 arp_ptr += 4 + bond->dev->addr_len;
2327 memcpy(&tip, arp_ptr, 4);
2328
2329 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2330 slave->dev->name, bond_slave_state(slave),
2331 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2332 &sip, &tip);
2333
2334 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2335
2336 /* Backup slaves won't see the ARP reply, but do come through
2337 * here for each ARP probe (so we swap the sip/tip to validate
2338 * the probe). In a "redundant switch, common router" type of
2339 * configuration, the ARP probe will (hopefully) travel from
2340 * the active, through one switch, the router, then the other
2341 * switch before reaching the backup.
2342 *
2343 * We 'trust' the arp requests if there is an active slave and
2344 * it received valid arp reply(s) after it became active. This
2345 * is done to avoid endless looping when we can't reach the
2346 * arp_ip_target and fool ourselves with our own arp requests.
2347 */
2348
2349 if (bond_is_active_slave(slave))
2350 bond_validate_arp(bond, slave, sip, tip);
2351 else if (curr_active_slave &&
2352 time_after(slave_last_rx(bond, curr_active_slave),
2353 curr_active_slave->last_link_up))
2354 bond_validate_arp(bond, slave, tip, sip);
2355
2356 out_unlock:
2357 if (arp != (struct arphdr *)skb->data)
2358 kfree(arp);
2359 return RX_HANDLER_ANOTHER;
2360 }
2361
2362 /* function to verify if we're in the arp_interval timeslice, returns true if
2363 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2364 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2365 */
2366 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2367 int mod)
2368 {
2369 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2370
2371 return time_in_range(jiffies,
2372 last_act - delta_in_ticks,
2373 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2374 }
2375
2376 /* This function is called regularly to monitor each slave's link
2377 * ensuring that traffic is being sent and received when arp monitoring
2378 * is used in load-balancing mode. if the adapter has been dormant, then an
2379 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2380 * arp monitoring in active backup mode.
2381 */
2382 static void bond_loadbalance_arp_mon(struct work_struct *work)
2383 {
2384 struct bonding *bond = container_of(work, struct bonding,
2385 arp_work.work);
2386 struct slave *slave, *oldcurrent;
2387 struct list_head *iter;
2388 int do_failover = 0, slave_state_changed = 0;
2389
2390 if (!bond_has_slaves(bond))
2391 goto re_arm;
2392
2393 rcu_read_lock();
2394
2395 oldcurrent = rcu_dereference(bond->curr_active_slave);
2396 /* see if any of the previous devices are up now (i.e. they have
2397 * xmt and rcv traffic). the curr_active_slave does not come into
2398 * the picture unless it is null. also, slave->last_link_up is not
2399 * needed here because we send an arp on each slave and give a slave
2400 * as long as it needs to get the tx/rx within the delta.
2401 * TODO: what about up/down delay in arp mode? it wasn't here before
2402 * so it can wait
2403 */
2404 bond_for_each_slave_rcu(bond, slave, iter) {
2405 unsigned long trans_start = dev_trans_start(slave->dev);
2406
2407 if (slave->link != BOND_LINK_UP) {
2408 if (bond_time_in_interval(bond, trans_start, 1) &&
2409 bond_time_in_interval(bond, slave->last_rx, 1)) {
2410
2411 slave->link = BOND_LINK_UP;
2412 slave_state_changed = 1;
2413
2414 /* primary_slave has no meaning in round-robin
2415 * mode. the window of a slave being up and
2416 * curr_active_slave being null after enslaving
2417 * is closed.
2418 */
2419 if (!oldcurrent) {
2420 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2421 slave->dev->name);
2422 do_failover = 1;
2423 } else {
2424 netdev_info(bond->dev, "interface %s is now up\n",
2425 slave->dev->name);
2426 }
2427 }
2428 } else {
2429 /* slave->link == BOND_LINK_UP */
2430
2431 /* not all switches will respond to an arp request
2432 * when the source ip is 0, so don't take the link down
2433 * if we don't know our ip yet
2434 */
2435 if (!bond_time_in_interval(bond, trans_start, 2) ||
2436 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2437
2438 slave->link = BOND_LINK_DOWN;
2439 slave_state_changed = 1;
2440
2441 if (slave->link_failure_count < UINT_MAX)
2442 slave->link_failure_count++;
2443
2444 netdev_info(bond->dev, "interface %s is now down\n",
2445 slave->dev->name);
2446
2447 if (slave == oldcurrent)
2448 do_failover = 1;
2449 }
2450 }
2451
2452 /* note: if switch is in round-robin mode, all links
2453 * must tx arp to ensure all links rx an arp - otherwise
2454 * links may oscillate or not come up at all; if switch is
2455 * in something like xor mode, there is nothing we can
2456 * do - all replies will be rx'ed on same link causing slaves
2457 * to be unstable during low/no traffic periods
2458 */
2459 if (bond_slave_is_up(slave))
2460 bond_arp_send_all(bond, slave);
2461 }
2462
2463 rcu_read_unlock();
2464
2465 if (do_failover || slave_state_changed) {
2466 if (!rtnl_trylock())
2467 goto re_arm;
2468
2469 if (slave_state_changed) {
2470 bond_slave_state_change(bond);
2471 if (BOND_MODE(bond) == BOND_MODE_XOR)
2472 bond_update_slave_arr(bond, NULL);
2473 }
2474 if (do_failover) {
2475 block_netpoll_tx();
2476 bond_select_active_slave(bond);
2477 unblock_netpoll_tx();
2478 }
2479 rtnl_unlock();
2480 }
2481
2482 re_arm:
2483 if (bond->params.arp_interval)
2484 queue_delayed_work(bond->wq, &bond->arp_work,
2485 msecs_to_jiffies(bond->params.arp_interval));
2486 }
2487
2488 /* Called to inspect slaves for active-backup mode ARP monitor link state
2489 * changes. Sets new_link in slaves to specify what action should take
2490 * place for the slave. Returns 0 if no changes are found, >0 if changes
2491 * to link states must be committed.
2492 *
2493 * Called with rcu_read_lock held.
2494 */
2495 static int bond_ab_arp_inspect(struct bonding *bond)
2496 {
2497 unsigned long trans_start, last_rx;
2498 struct list_head *iter;
2499 struct slave *slave;
2500 int commit = 0;
2501
2502 bond_for_each_slave_rcu(bond, slave, iter) {
2503 slave->new_link = BOND_LINK_NOCHANGE;
2504 last_rx = slave_last_rx(bond, slave);
2505
2506 if (slave->link != BOND_LINK_UP) {
2507 if (bond_time_in_interval(bond, last_rx, 1)) {
2508 slave->new_link = BOND_LINK_UP;
2509 commit++;
2510 }
2511 continue;
2512 }
2513
2514 /* Give slaves 2*delta after being enslaved or made
2515 * active. This avoids bouncing, as the last receive
2516 * times need a full ARP monitor cycle to be updated.
2517 */
2518 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2519 continue;
2520
2521 /* Backup slave is down if:
2522 * - No current_arp_slave AND
2523 * - more than 3*delta since last receive AND
2524 * - the bond has an IP address
2525 *
2526 * Note: a non-null current_arp_slave indicates
2527 * the curr_active_slave went down and we are
2528 * searching for a new one; under this condition
2529 * we only take the curr_active_slave down - this
2530 * gives each slave a chance to tx/rx traffic
2531 * before being taken out
2532 */
2533 if (!bond_is_active_slave(slave) &&
2534 !rcu_access_pointer(bond->current_arp_slave) &&
2535 !bond_time_in_interval(bond, last_rx, 3)) {
2536 slave->new_link = BOND_LINK_DOWN;
2537 commit++;
2538 }
2539
2540 /* Active slave is down if:
2541 * - more than 2*delta since transmitting OR
2542 * - (more than 2*delta since receive AND
2543 * the bond has an IP address)
2544 */
2545 trans_start = dev_trans_start(slave->dev);
2546 if (bond_is_active_slave(slave) &&
2547 (!bond_time_in_interval(bond, trans_start, 2) ||
2548 !bond_time_in_interval(bond, last_rx, 2))) {
2549 slave->new_link = BOND_LINK_DOWN;
2550 commit++;
2551 }
2552 }
2553
2554 return commit;
2555 }
2556
2557 /* Called to commit link state changes noted by inspection step of
2558 * active-backup mode ARP monitor.
2559 *
2560 * Called with RTNL hold.
2561 */
2562 static void bond_ab_arp_commit(struct bonding *bond)
2563 {
2564 unsigned long trans_start;
2565 struct list_head *iter;
2566 struct slave *slave;
2567
2568 bond_for_each_slave(bond, slave, iter) {
2569 switch (slave->new_link) {
2570 case BOND_LINK_NOCHANGE:
2571 continue;
2572
2573 case BOND_LINK_UP:
2574 trans_start = dev_trans_start(slave->dev);
2575 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2576 (!rtnl_dereference(bond->curr_active_slave) &&
2577 bond_time_in_interval(bond, trans_start, 1))) {
2578 struct slave *current_arp_slave;
2579
2580 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2581 slave->link = BOND_LINK_UP;
2582 if (current_arp_slave) {
2583 bond_set_slave_inactive_flags(
2584 current_arp_slave,
2585 BOND_SLAVE_NOTIFY_NOW);
2586 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2587 }
2588
2589 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2590 slave->dev->name);
2591
2592 if (!rtnl_dereference(bond->curr_active_slave) ||
2593 slave == rtnl_dereference(bond->primary_slave))
2594 goto do_failover;
2595
2596 }
2597
2598 continue;
2599
2600 case BOND_LINK_DOWN:
2601 if (slave->link_failure_count < UINT_MAX)
2602 slave->link_failure_count++;
2603
2604 slave->link = BOND_LINK_DOWN;
2605 bond_set_slave_inactive_flags(slave,
2606 BOND_SLAVE_NOTIFY_NOW);
2607
2608 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2609 slave->dev->name);
2610
2611 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2612 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2613 goto do_failover;
2614 }
2615
2616 continue;
2617
2618 default:
2619 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2620 slave->new_link, slave->dev->name);
2621 continue;
2622 }
2623
2624 do_failover:
2625 block_netpoll_tx();
2626 bond_select_active_slave(bond);
2627 unblock_netpoll_tx();
2628 }
2629
2630 bond_set_carrier(bond);
2631 }
2632
2633 /* Send ARP probes for active-backup mode ARP monitor.
2634 *
2635 * Called with rcu_read_lock held.
2636 */
2637 static bool bond_ab_arp_probe(struct bonding *bond)
2638 {
2639 struct slave *slave, *before = NULL, *new_slave = NULL,
2640 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2641 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2642 struct list_head *iter;
2643 bool found = false;
2644 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2645
2646 if (curr_arp_slave && curr_active_slave)
2647 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2648 curr_arp_slave->dev->name,
2649 curr_active_slave->dev->name);
2650
2651 if (curr_active_slave) {
2652 bond_arp_send_all(bond, curr_active_slave);
2653 return should_notify_rtnl;
2654 }
2655
2656 /* if we don't have a curr_active_slave, search for the next available
2657 * backup slave from the current_arp_slave and make it the candidate
2658 * for becoming the curr_active_slave
2659 */
2660
2661 if (!curr_arp_slave) {
2662 curr_arp_slave = bond_first_slave_rcu(bond);
2663 if (!curr_arp_slave)
2664 return should_notify_rtnl;
2665 }
2666
2667 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2668
2669 bond_for_each_slave_rcu(bond, slave, iter) {
2670 if (!found && !before && bond_slave_is_up(slave))
2671 before = slave;
2672
2673 if (found && !new_slave && bond_slave_is_up(slave))
2674 new_slave = slave;
2675 /* if the link state is up at this point, we
2676 * mark it down - this can happen if we have
2677 * simultaneous link failures and
2678 * reselect_active_interface doesn't make this
2679 * one the current slave so it is still marked
2680 * up when it is actually down
2681 */
2682 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2683 slave->link = BOND_LINK_DOWN;
2684 if (slave->link_failure_count < UINT_MAX)
2685 slave->link_failure_count++;
2686
2687 bond_set_slave_inactive_flags(slave,
2688 BOND_SLAVE_NOTIFY_LATER);
2689
2690 netdev_info(bond->dev, "backup interface %s is now down\n",
2691 slave->dev->name);
2692 }
2693 if (slave == curr_arp_slave)
2694 found = true;
2695 }
2696
2697 if (!new_slave && before)
2698 new_slave = before;
2699
2700 if (!new_slave)
2701 goto check_state;
2702
2703 new_slave->link = BOND_LINK_BACK;
2704 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2705 bond_arp_send_all(bond, new_slave);
2706 new_slave->last_link_up = jiffies;
2707 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2708
2709 check_state:
2710 bond_for_each_slave_rcu(bond, slave, iter) {
2711 if (slave->should_notify) {
2712 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2713 break;
2714 }
2715 }
2716 return should_notify_rtnl;
2717 }
2718
2719 static void bond_activebackup_arp_mon(struct work_struct *work)
2720 {
2721 struct bonding *bond = container_of(work, struct bonding,
2722 arp_work.work);
2723 bool should_notify_peers = false;
2724 bool should_notify_rtnl = false;
2725 int delta_in_ticks;
2726
2727 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2728
2729 if (!bond_has_slaves(bond))
2730 goto re_arm;
2731
2732 rcu_read_lock();
2733
2734 should_notify_peers = bond_should_notify_peers(bond);
2735
2736 if (bond_ab_arp_inspect(bond)) {
2737 rcu_read_unlock();
2738
2739 /* Race avoidance with bond_close flush of workqueue */
2740 if (!rtnl_trylock()) {
2741 delta_in_ticks = 1;
2742 should_notify_peers = false;
2743 goto re_arm;
2744 }
2745
2746 bond_ab_arp_commit(bond);
2747
2748 rtnl_unlock();
2749 rcu_read_lock();
2750 }
2751
2752 should_notify_rtnl = bond_ab_arp_probe(bond);
2753 rcu_read_unlock();
2754
2755 re_arm:
2756 if (bond->params.arp_interval)
2757 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2758
2759 if (should_notify_peers || should_notify_rtnl) {
2760 if (!rtnl_trylock())
2761 return;
2762
2763 if (should_notify_peers)
2764 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2765 bond->dev);
2766 if (should_notify_rtnl)
2767 bond_slave_state_notify(bond);
2768
2769 rtnl_unlock();
2770 }
2771 }
2772
2773 /*-------------------------- netdev event handling --------------------------*/
2774
2775 /* Change device name */
2776 static int bond_event_changename(struct bonding *bond)
2777 {
2778 bond_remove_proc_entry(bond);
2779 bond_create_proc_entry(bond);
2780
2781 bond_debug_reregister(bond);
2782
2783 return NOTIFY_DONE;
2784 }
2785
2786 static int bond_master_netdev_event(unsigned long event,
2787 struct net_device *bond_dev)
2788 {
2789 struct bonding *event_bond = netdev_priv(bond_dev);
2790
2791 switch (event) {
2792 case NETDEV_CHANGENAME:
2793 return bond_event_changename(event_bond);
2794 case NETDEV_UNREGISTER:
2795 bond_remove_proc_entry(event_bond);
2796 break;
2797 case NETDEV_REGISTER:
2798 bond_create_proc_entry(event_bond);
2799 break;
2800 case NETDEV_NOTIFY_PEERS:
2801 if (event_bond->send_peer_notif)
2802 event_bond->send_peer_notif--;
2803 break;
2804 default:
2805 break;
2806 }
2807
2808 return NOTIFY_DONE;
2809 }
2810
2811 static int bond_slave_netdev_event(unsigned long event,
2812 struct net_device *slave_dev)
2813 {
2814 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
2815 struct bonding *bond;
2816 struct net_device *bond_dev;
2817 u32 old_speed;
2818 u8 old_duplex;
2819
2820 /* A netdev event can be generated while enslaving a device
2821 * before netdev_rx_handler_register is called in which case
2822 * slave will be NULL
2823 */
2824 if (!slave)
2825 return NOTIFY_DONE;
2826 bond_dev = slave->bond->dev;
2827 bond = slave->bond;
2828 primary = rtnl_dereference(bond->primary_slave);
2829
2830 switch (event) {
2831 case NETDEV_UNREGISTER:
2832 if (bond_dev->type != ARPHRD_ETHER)
2833 bond_release_and_destroy(bond_dev, slave_dev);
2834 else
2835 bond_release(bond_dev, slave_dev);
2836 break;
2837 case NETDEV_UP:
2838 case NETDEV_CHANGE:
2839 old_speed = slave->speed;
2840 old_duplex = slave->duplex;
2841
2842 bond_update_speed_duplex(slave);
2843
2844 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2845 if (old_speed != slave->speed)
2846 bond_3ad_adapter_speed_changed(slave);
2847 if (old_duplex != slave->duplex)
2848 bond_3ad_adapter_duplex_changed(slave);
2849 }
2850 /* Refresh slave-array if applicable!
2851 * If the setup does not use miimon or arpmon (mode-specific!),
2852 * then these events will not cause the slave-array to be
2853 * refreshed. This will cause xmit to use a slave that is not
2854 * usable. Avoid such situation by refeshing the array at these
2855 * events. If these (miimon/arpmon) parameters are configured
2856 * then array gets refreshed twice and that should be fine!
2857 */
2858 if (bond_mode_uses_xmit_hash(bond))
2859 bond_update_slave_arr(bond, NULL);
2860 break;
2861 case NETDEV_DOWN:
2862 if (bond_mode_uses_xmit_hash(bond))
2863 bond_update_slave_arr(bond, NULL);
2864 break;
2865 case NETDEV_CHANGEMTU:
2866 /* TODO: Should slaves be allowed to
2867 * independently alter their MTU? For
2868 * an active-backup bond, slaves need
2869 * not be the same type of device, so
2870 * MTUs may vary. For other modes,
2871 * slaves arguably should have the
2872 * same MTUs. To do this, we'd need to
2873 * take over the slave's change_mtu
2874 * function for the duration of their
2875 * servitude.
2876 */
2877 break;
2878 case NETDEV_CHANGENAME:
2879 /* we don't care if we don't have primary set */
2880 if (!bond_uses_primary(bond) ||
2881 !bond->params.primary[0])
2882 break;
2883
2884 if (slave == primary) {
2885 /* slave's name changed - he's no longer primary */
2886 RCU_INIT_POINTER(bond->primary_slave, NULL);
2887 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
2888 /* we have a new primary slave */
2889 rcu_assign_pointer(bond->primary_slave, slave);
2890 } else { /* we didn't change primary - exit */
2891 break;
2892 }
2893
2894 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
2895 primary ? slave_dev->name : "none");
2896
2897 block_netpoll_tx();
2898 bond_select_active_slave(bond);
2899 unblock_netpoll_tx();
2900 break;
2901 case NETDEV_FEAT_CHANGE:
2902 bond_compute_features(bond);
2903 break;
2904 case NETDEV_RESEND_IGMP:
2905 /* Propagate to master device */
2906 call_netdevice_notifiers(event, slave->bond->dev);
2907 break;
2908 default:
2909 break;
2910 }
2911
2912 return NOTIFY_DONE;
2913 }
2914
2915 /* bond_netdev_event: handle netdev notifier chain events.
2916 *
2917 * This function receives events for the netdev chain. The caller (an
2918 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
2919 * locks for us to safely manipulate the slave devices (RTNL lock,
2920 * dev_probe_lock).
2921 */
2922 static int bond_netdev_event(struct notifier_block *this,
2923 unsigned long event, void *ptr)
2924 {
2925 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2926
2927 netdev_dbg(event_dev, "event: %lx\n", event);
2928
2929 if (!(event_dev->priv_flags & IFF_BONDING))
2930 return NOTIFY_DONE;
2931
2932 if (event_dev->flags & IFF_MASTER) {
2933 netdev_dbg(event_dev, "IFF_MASTER\n");
2934 return bond_master_netdev_event(event, event_dev);
2935 }
2936
2937 if (event_dev->flags & IFF_SLAVE) {
2938 netdev_dbg(event_dev, "IFF_SLAVE\n");
2939 return bond_slave_netdev_event(event, event_dev);
2940 }
2941
2942 return NOTIFY_DONE;
2943 }
2944
2945 static struct notifier_block bond_netdev_notifier = {
2946 .notifier_call = bond_netdev_event,
2947 };
2948
2949 /*---------------------------- Hashing Policies -----------------------------*/
2950
2951 /* L2 hash helper */
2952 static inline u32 bond_eth_hash(struct sk_buff *skb)
2953 {
2954 struct ethhdr *ep, hdr_tmp;
2955
2956 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
2957 if (ep)
2958 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
2959 return 0;
2960 }
2961
2962 /* Extract the appropriate headers based on bond's xmit policy */
2963 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
2964 struct flow_keys *fk)
2965 {
2966 const struct ipv6hdr *iph6;
2967 const struct iphdr *iph;
2968 int noff, proto = -1;
2969
2970 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
2971 return skb_flow_dissect(skb, fk);
2972
2973 fk->ports = 0;
2974 noff = skb_network_offset(skb);
2975 if (skb->protocol == htons(ETH_P_IP)) {
2976 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
2977 return false;
2978 iph = ip_hdr(skb);
2979 fk->src = iph->saddr;
2980 fk->dst = iph->daddr;
2981 noff += iph->ihl << 2;
2982 if (!ip_is_fragment(iph))
2983 proto = iph->protocol;
2984 } else if (skb->protocol == htons(ETH_P_IPV6)) {
2985 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
2986 return false;
2987 iph6 = ipv6_hdr(skb);
2988 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
2989 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
2990 noff += sizeof(*iph6);
2991 proto = iph6->nexthdr;
2992 } else {
2993 return false;
2994 }
2995 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
2996 fk->ports = skb_flow_get_ports(skb, noff, proto);
2997
2998 return true;
2999 }
3000
3001 /**
3002 * bond_xmit_hash - generate a hash value based on the xmit policy
3003 * @bond: bonding device
3004 * @skb: buffer to use for headers
3005 *
3006 * This function will extract the necessary headers from the skb buffer and use
3007 * them to generate a hash based on the xmit_policy set in the bonding device
3008 */
3009 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3010 {
3011 struct flow_keys flow;
3012 u32 hash;
3013
3014 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3015 !bond_flow_dissect(bond, skb, &flow))
3016 return bond_eth_hash(skb);
3017
3018 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3019 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3020 hash = bond_eth_hash(skb);
3021 else
3022 hash = (__force u32)flow.ports;
3023 hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
3024 hash ^= (hash >> 16);
3025 hash ^= (hash >> 8);
3026
3027 return hash;
3028 }
3029
3030 /*-------------------------- Device entry points ----------------------------*/
3031
3032 static void bond_work_init_all(struct bonding *bond)
3033 {
3034 INIT_DELAYED_WORK(&bond->mcast_work,
3035 bond_resend_igmp_join_requests_delayed);
3036 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3037 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3038 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3039 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3040 else
3041 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3042 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3043 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3044 }
3045
3046 static void bond_work_cancel_all(struct bonding *bond)
3047 {
3048 cancel_delayed_work_sync(&bond->mii_work);
3049 cancel_delayed_work_sync(&bond->arp_work);
3050 cancel_delayed_work_sync(&bond->alb_work);
3051 cancel_delayed_work_sync(&bond->ad_work);
3052 cancel_delayed_work_sync(&bond->mcast_work);
3053 cancel_delayed_work_sync(&bond->slave_arr_work);
3054 }
3055
3056 static int bond_open(struct net_device *bond_dev)
3057 {
3058 struct bonding *bond = netdev_priv(bond_dev);
3059 struct list_head *iter;
3060 struct slave *slave;
3061
3062 /* reset slave->backup and slave->inactive */
3063 if (bond_has_slaves(bond)) {
3064 bond_for_each_slave(bond, slave, iter) {
3065 if (bond_uses_primary(bond) &&
3066 slave != rcu_access_pointer(bond->curr_active_slave)) {
3067 bond_set_slave_inactive_flags(slave,
3068 BOND_SLAVE_NOTIFY_NOW);
3069 } else {
3070 bond_set_slave_active_flags(slave,
3071 BOND_SLAVE_NOTIFY_NOW);
3072 }
3073 }
3074 }
3075
3076 bond_work_init_all(bond);
3077
3078 if (bond_is_lb(bond)) {
3079 /* bond_alb_initialize must be called before the timer
3080 * is started.
3081 */
3082 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3083 return -ENOMEM;
3084 if (bond->params.tlb_dynamic_lb)
3085 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3086 }
3087
3088 if (bond->params.miimon) /* link check interval, in milliseconds. */
3089 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3090
3091 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3092 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3093 bond->recv_probe = bond_arp_rcv;
3094 }
3095
3096 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3097 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3098 /* register to receive LACPDUs */
3099 bond->recv_probe = bond_3ad_lacpdu_recv;
3100 bond_3ad_initiate_agg_selection(bond, 1);
3101 }
3102
3103 if (bond_mode_uses_xmit_hash(bond))
3104 bond_update_slave_arr(bond, NULL);
3105
3106 return 0;
3107 }
3108
3109 static int bond_close(struct net_device *bond_dev)
3110 {
3111 struct bonding *bond = netdev_priv(bond_dev);
3112
3113 bond_work_cancel_all(bond);
3114 bond->send_peer_notif = 0;
3115 if (bond_is_lb(bond))
3116 bond_alb_deinitialize(bond);
3117 bond->recv_probe = NULL;
3118
3119 return 0;
3120 }
3121
3122 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3123 struct rtnl_link_stats64 *stats)
3124 {
3125 struct bonding *bond = netdev_priv(bond_dev);
3126 struct rtnl_link_stats64 temp;
3127 struct list_head *iter;
3128 struct slave *slave;
3129
3130 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3131
3132 bond_for_each_slave(bond, slave, iter) {
3133 const struct rtnl_link_stats64 *sstats =
3134 dev_get_stats(slave->dev, &temp);
3135 struct rtnl_link_stats64 *pstats = &slave->slave_stats;
3136
3137 stats->rx_packets += sstats->rx_packets - pstats->rx_packets;
3138 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
3139 stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
3140 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
3141
3142 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;;
3143 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
3144 stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
3145 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped;
3146
3147 stats->multicast += sstats->multicast - pstats->multicast;
3148 stats->collisions += sstats->collisions - pstats->collisions;
3149
3150 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
3151 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
3152 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
3153 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
3154 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
3155 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
3156
3157 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors;
3158 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
3159 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
3160 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
3161 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors;
3162
3163 /* save off the slave stats for the next run */
3164 memcpy(pstats, sstats, sizeof(*sstats));
3165 }
3166 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3167
3168 return stats;
3169 }
3170
3171 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3172 {
3173 struct bonding *bond = netdev_priv(bond_dev);
3174 struct net_device *slave_dev = NULL;
3175 struct ifbond k_binfo;
3176 struct ifbond __user *u_binfo = NULL;
3177 struct ifslave k_sinfo;
3178 struct ifslave __user *u_sinfo = NULL;
3179 struct mii_ioctl_data *mii = NULL;
3180 struct bond_opt_value newval;
3181 struct net *net;
3182 int res = 0;
3183
3184 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3185
3186 switch (cmd) {
3187 case SIOCGMIIPHY:
3188 mii = if_mii(ifr);
3189 if (!mii)
3190 return -EINVAL;
3191
3192 mii->phy_id = 0;
3193 /* Fall Through */
3194 case SIOCGMIIREG:
3195 /* We do this again just in case we were called by SIOCGMIIREG
3196 * instead of SIOCGMIIPHY.
3197 */
3198 mii = if_mii(ifr);
3199 if (!mii)
3200 return -EINVAL;
3201
3202 if (mii->reg_num == 1) {
3203 mii->val_out = 0;
3204 if (netif_carrier_ok(bond->dev))
3205 mii->val_out = BMSR_LSTATUS;
3206 }
3207
3208 return 0;
3209 case BOND_INFO_QUERY_OLD:
3210 case SIOCBONDINFOQUERY:
3211 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3212
3213 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3214 return -EFAULT;
3215
3216 res = bond_info_query(bond_dev, &k_binfo);
3217 if (res == 0 &&
3218 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3219 return -EFAULT;
3220
3221 return res;
3222 case BOND_SLAVE_INFO_QUERY_OLD:
3223 case SIOCBONDSLAVEINFOQUERY:
3224 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3225
3226 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3227 return -EFAULT;
3228
3229 res = bond_slave_info_query(bond_dev, &k_sinfo);
3230 if (res == 0 &&
3231 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3232 return -EFAULT;
3233
3234 return res;
3235 default:
3236 break;
3237 }
3238
3239 net = dev_net(bond_dev);
3240
3241 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3242 return -EPERM;
3243
3244 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3245
3246 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3247
3248 if (!slave_dev)
3249 return -ENODEV;
3250
3251 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3252 switch (cmd) {
3253 case BOND_ENSLAVE_OLD:
3254 case SIOCBONDENSLAVE:
3255 res = bond_enslave(bond_dev, slave_dev);
3256 break;
3257 case BOND_RELEASE_OLD:
3258 case SIOCBONDRELEASE:
3259 res = bond_release(bond_dev, slave_dev);
3260 break;
3261 case BOND_SETHWADDR_OLD:
3262 case SIOCBONDSETHWADDR:
3263 bond_set_dev_addr(bond_dev, slave_dev);
3264 res = 0;
3265 break;
3266 case BOND_CHANGE_ACTIVE_OLD:
3267 case SIOCBONDCHANGEACTIVE:
3268 bond_opt_initstr(&newval, slave_dev->name);
3269 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3270 break;
3271 default:
3272 res = -EOPNOTSUPP;
3273 }
3274
3275 return res;
3276 }
3277
3278 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3279 {
3280 struct bonding *bond = netdev_priv(bond_dev);
3281
3282 if (change & IFF_PROMISC)
3283 bond_set_promiscuity(bond,
3284 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3285
3286 if (change & IFF_ALLMULTI)
3287 bond_set_allmulti(bond,
3288 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3289 }
3290
3291 static void bond_set_rx_mode(struct net_device *bond_dev)
3292 {
3293 struct bonding *bond = netdev_priv(bond_dev);
3294 struct list_head *iter;
3295 struct slave *slave;
3296
3297 rcu_read_lock();
3298 if (bond_uses_primary(bond)) {
3299 slave = rcu_dereference(bond->curr_active_slave);
3300 if (slave) {
3301 dev_uc_sync(slave->dev, bond_dev);
3302 dev_mc_sync(slave->dev, bond_dev);
3303 }
3304 } else {
3305 bond_for_each_slave_rcu(bond, slave, iter) {
3306 dev_uc_sync_multiple(slave->dev, bond_dev);
3307 dev_mc_sync_multiple(slave->dev, bond_dev);
3308 }
3309 }
3310 rcu_read_unlock();
3311 }
3312
3313 static int bond_neigh_init(struct neighbour *n)
3314 {
3315 struct bonding *bond = netdev_priv(n->dev);
3316 const struct net_device_ops *slave_ops;
3317 struct neigh_parms parms;
3318 struct slave *slave;
3319 int ret;
3320
3321 slave = bond_first_slave(bond);
3322 if (!slave)
3323 return 0;
3324 slave_ops = slave->dev->netdev_ops;
3325 if (!slave_ops->ndo_neigh_setup)
3326 return 0;
3327
3328 parms.neigh_setup = NULL;
3329 parms.neigh_cleanup = NULL;
3330 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3331 if (ret)
3332 return ret;
3333
3334 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3335 * after the last slave has been detached. Assumes that all slaves
3336 * utilize the same neigh_cleanup (true at this writing as only user
3337 * is ipoib).
3338 */
3339 n->parms->neigh_cleanup = parms.neigh_cleanup;
3340
3341 if (!parms.neigh_setup)
3342 return 0;
3343
3344 return parms.neigh_setup(n);
3345 }
3346
3347 /* The bonding ndo_neigh_setup is called at init time beofre any
3348 * slave exists. So we must declare proxy setup function which will
3349 * be used at run time to resolve the actual slave neigh param setup.
3350 *
3351 * It's also called by master devices (such as vlans) to setup their
3352 * underlying devices. In that case - do nothing, we're already set up from
3353 * our init.
3354 */
3355 static int bond_neigh_setup(struct net_device *dev,
3356 struct neigh_parms *parms)
3357 {
3358 /* modify only our neigh_parms */
3359 if (parms->dev == dev)
3360 parms->neigh_setup = bond_neigh_init;
3361
3362 return 0;
3363 }
3364
3365 /* Change the MTU of all of a master's slaves to match the master */
3366 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3367 {
3368 struct bonding *bond = netdev_priv(bond_dev);
3369 struct slave *slave, *rollback_slave;
3370 struct list_head *iter;
3371 int res = 0;
3372
3373 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3374
3375 bond_for_each_slave(bond, slave, iter) {
3376 netdev_dbg(bond_dev, "s %p c_m %p\n",
3377 slave, slave->dev->netdev_ops->ndo_change_mtu);
3378
3379 res = dev_set_mtu(slave->dev, new_mtu);
3380
3381 if (res) {
3382 /* If we failed to set the slave's mtu to the new value
3383 * we must abort the operation even in ACTIVE_BACKUP
3384 * mode, because if we allow the backup slaves to have
3385 * different mtu values than the active slave we'll
3386 * need to change their mtu when doing a failover. That
3387 * means changing their mtu from timer context, which
3388 * is probably not a good idea.
3389 */
3390 netdev_dbg(bond_dev, "err %d %s\n", res,
3391 slave->dev->name);
3392 goto unwind;
3393 }
3394 }
3395
3396 bond_dev->mtu = new_mtu;
3397
3398 return 0;
3399
3400 unwind:
3401 /* unwind from head to the slave that failed */
3402 bond_for_each_slave(bond, rollback_slave, iter) {
3403 int tmp_res;
3404
3405 if (rollback_slave == slave)
3406 break;
3407
3408 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3409 if (tmp_res) {
3410 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3411 tmp_res, rollback_slave->dev->name);
3412 }
3413 }
3414
3415 return res;
3416 }
3417
3418 /* Change HW address
3419 *
3420 * Note that many devices must be down to change the HW address, and
3421 * downing the master releases all slaves. We can make bonds full of
3422 * bonding devices to test this, however.
3423 */
3424 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3425 {
3426 struct bonding *bond = netdev_priv(bond_dev);
3427 struct slave *slave, *rollback_slave;
3428 struct sockaddr *sa = addr, tmp_sa;
3429 struct list_head *iter;
3430 int res = 0;
3431
3432 if (BOND_MODE(bond) == BOND_MODE_ALB)
3433 return bond_alb_set_mac_address(bond_dev, addr);
3434
3435
3436 netdev_dbg(bond_dev, "bond=%p\n", bond);
3437
3438 /* If fail_over_mac is enabled, do nothing and return success.
3439 * Returning an error causes ifenslave to fail.
3440 */
3441 if (bond->params.fail_over_mac &&
3442 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3443 return 0;
3444
3445 if (!is_valid_ether_addr(sa->sa_data))
3446 return -EADDRNOTAVAIL;
3447
3448 bond_for_each_slave(bond, slave, iter) {
3449 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3450 res = dev_set_mac_address(slave->dev, addr);
3451 if (res) {
3452 /* TODO: consider downing the slave
3453 * and retry ?
3454 * User should expect communications
3455 * breakage anyway until ARP finish
3456 * updating, so...
3457 */
3458 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3459 goto unwind;
3460 }
3461 }
3462
3463 /* success */
3464 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3465 return 0;
3466
3467 unwind:
3468 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3469 tmp_sa.sa_family = bond_dev->type;
3470
3471 /* unwind from head to the slave that failed */
3472 bond_for_each_slave(bond, rollback_slave, iter) {
3473 int tmp_res;
3474
3475 if (rollback_slave == slave)
3476 break;
3477
3478 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3479 if (tmp_res) {
3480 netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3481 tmp_res, rollback_slave->dev->name);
3482 }
3483 }
3484
3485 return res;
3486 }
3487
3488 /**
3489 * bond_xmit_slave_id - transmit skb through slave with slave_id
3490 * @bond: bonding device that is transmitting
3491 * @skb: buffer to transmit
3492 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3493 *
3494 * This function tries to transmit through slave with slave_id but in case
3495 * it fails, it tries to find the first available slave for transmission.
3496 * The skb is consumed in all cases, thus the function is void.
3497 */
3498 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3499 {
3500 struct list_head *iter;
3501 struct slave *slave;
3502 int i = slave_id;
3503
3504 /* Here we start from the slave with slave_id */
3505 bond_for_each_slave_rcu(bond, slave, iter) {
3506 if (--i < 0) {
3507 if (bond_slave_can_tx(slave)) {
3508 bond_dev_queue_xmit(bond, skb, slave->dev);
3509 return;
3510 }
3511 }
3512 }
3513
3514 /* Here we start from the first slave up to slave_id */
3515 i = slave_id;
3516 bond_for_each_slave_rcu(bond, slave, iter) {
3517 if (--i < 0)
3518 break;
3519 if (bond_slave_can_tx(slave)) {
3520 bond_dev_queue_xmit(bond, skb, slave->dev);
3521 return;
3522 }
3523 }
3524 /* no slave that can tx has been found */
3525 bond_tx_drop(bond->dev, skb);
3526 }
3527
3528 /**
3529 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3530 * @bond: bonding device to use
3531 *
3532 * Based on the value of the bonding device's packets_per_slave parameter
3533 * this function generates a slave id, which is usually used as the next
3534 * slave to transmit through.
3535 */
3536 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3537 {
3538 u32 slave_id;
3539 struct reciprocal_value reciprocal_packets_per_slave;
3540 int packets_per_slave = bond->params.packets_per_slave;
3541
3542 switch (packets_per_slave) {
3543 case 0:
3544 slave_id = prandom_u32();
3545 break;
3546 case 1:
3547 slave_id = bond->rr_tx_counter;
3548 break;
3549 default:
3550 reciprocal_packets_per_slave =
3551 bond->params.reciprocal_packets_per_slave;
3552 slave_id = reciprocal_divide(bond->rr_tx_counter,
3553 reciprocal_packets_per_slave);
3554 break;
3555 }
3556 bond->rr_tx_counter++;
3557
3558 return slave_id;
3559 }
3560
3561 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3562 {
3563 struct bonding *bond = netdev_priv(bond_dev);
3564 struct iphdr *iph = ip_hdr(skb);
3565 struct slave *slave;
3566 u32 slave_id;
3567
3568 /* Start with the curr_active_slave that joined the bond as the
3569 * default for sending IGMP traffic. For failover purposes one
3570 * needs to maintain some consistency for the interface that will
3571 * send the join/membership reports. The curr_active_slave found
3572 * will send all of this type of traffic.
3573 */
3574 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3575 slave = rcu_dereference(bond->curr_active_slave);
3576 if (slave)
3577 bond_dev_queue_xmit(bond, skb, slave->dev);
3578 else
3579 bond_xmit_slave_id(bond, skb, 0);
3580 } else {
3581 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3582
3583 if (likely(slave_cnt)) {
3584 slave_id = bond_rr_gen_slave_id(bond);
3585 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3586 } else {
3587 bond_tx_drop(bond_dev, skb);
3588 }
3589 }
3590
3591 return NETDEV_TX_OK;
3592 }
3593
3594 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3595 * the bond has a usable interface.
3596 */
3597 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3598 {
3599 struct bonding *bond = netdev_priv(bond_dev);
3600 struct slave *slave;
3601
3602 slave = rcu_dereference(bond->curr_active_slave);
3603 if (slave)
3604 bond_dev_queue_xmit(bond, skb, slave->dev);
3605 else
3606 bond_tx_drop(bond_dev, skb);
3607
3608 return NETDEV_TX_OK;
3609 }
3610
3611 /* Use this to update slave_array when (a) it's not appropriate to update
3612 * slave_array right away (note that update_slave_array() may sleep)
3613 * and / or (b) RTNL is not held.
3614 */
3615 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3616 {
3617 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3618 }
3619
3620 /* Slave array work handler. Holds only RTNL */
3621 static void bond_slave_arr_handler(struct work_struct *work)
3622 {
3623 struct bonding *bond = container_of(work, struct bonding,
3624 slave_arr_work.work);
3625 int ret;
3626
3627 if (!rtnl_trylock())
3628 goto err;
3629
3630 ret = bond_update_slave_arr(bond, NULL);
3631 rtnl_unlock();
3632 if (ret) {
3633 pr_warn_ratelimited("Failed to update slave array from WT\n");
3634 goto err;
3635 }
3636 return;
3637
3638 err:
3639 bond_slave_arr_work_rearm(bond, 1);
3640 }
3641
3642 /* Build the usable slaves array in control path for modes that use xmit-hash
3643 * to determine the slave interface -
3644 * (a) BOND_MODE_8023AD
3645 * (b) BOND_MODE_XOR
3646 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3647 *
3648 * The caller is expected to hold RTNL only and NO other lock!
3649 */
3650 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3651 {
3652 struct slave *slave;
3653 struct list_head *iter;
3654 struct bond_up_slave *new_arr, *old_arr;
3655 int slaves_in_agg;
3656 int agg_id = 0;
3657 int ret = 0;
3658
3659 #ifdef CONFIG_LOCKDEP
3660 WARN_ON(lockdep_is_held(&bond->mode_lock));
3661 #endif
3662
3663 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3664 GFP_KERNEL);
3665 if (!new_arr) {
3666 ret = -ENOMEM;
3667 pr_err("Failed to build slave-array.\n");
3668 goto out;
3669 }
3670 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3671 struct ad_info ad_info;
3672
3673 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3674 pr_debug("bond_3ad_get_active_agg_info failed\n");
3675 kfree_rcu(new_arr, rcu);
3676 /* No active aggragator means it's not safe to use
3677 * the previous array.
3678 */
3679 old_arr = rtnl_dereference(bond->slave_arr);
3680 if (old_arr) {
3681 RCU_INIT_POINTER(bond->slave_arr, NULL);
3682 kfree_rcu(old_arr, rcu);
3683 }
3684 goto out;
3685 }
3686 slaves_in_agg = ad_info.ports;
3687 agg_id = ad_info.aggregator_id;
3688 }
3689 bond_for_each_slave(bond, slave, iter) {
3690 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3691 struct aggregator *agg;
3692
3693 agg = SLAVE_AD_INFO(slave)->port.aggregator;
3694 if (!agg || agg->aggregator_identifier != agg_id)
3695 continue;
3696 }
3697 if (!bond_slave_can_tx(slave))
3698 continue;
3699 if (skipslave == slave)
3700 continue;
3701 new_arr->arr[new_arr->count++] = slave;
3702 }
3703
3704 old_arr = rtnl_dereference(bond->slave_arr);
3705 rcu_assign_pointer(bond->slave_arr, new_arr);
3706 if (old_arr)
3707 kfree_rcu(old_arr, rcu);
3708 out:
3709 if (ret != 0 && skipslave) {
3710 int idx;
3711
3712 /* Rare situation where caller has asked to skip a specific
3713 * slave but allocation failed (most likely!). BTW this is
3714 * only possible when the call is initiated from
3715 * __bond_release_one(). In this situation; overwrite the
3716 * skipslave entry in the array with the last entry from the
3717 * array to avoid a situation where the xmit path may choose
3718 * this to-be-skipped slave to send a packet out.
3719 */
3720 old_arr = rtnl_dereference(bond->slave_arr);
3721 for (idx = 0; idx < old_arr->count; idx++) {
3722 if (skipslave == old_arr->arr[idx]) {
3723 old_arr->arr[idx] =
3724 old_arr->arr[old_arr->count-1];
3725 old_arr->count--;
3726 break;
3727 }
3728 }
3729 }
3730 return ret;
3731 }
3732
3733 /* Use this Xmit function for 3AD as well as XOR modes. The current
3734 * usable slave array is formed in the control path. The xmit function
3735 * just calculates hash and sends the packet out.
3736 */
3737 int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3738 {
3739 struct bonding *bond = netdev_priv(dev);
3740 struct slave *slave;
3741 struct bond_up_slave *slaves;
3742 unsigned int count;
3743
3744 slaves = rcu_dereference(bond->slave_arr);
3745 count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3746 if (likely(count)) {
3747 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3748 bond_dev_queue_xmit(bond, skb, slave->dev);
3749 } else {
3750 bond_tx_drop(dev, skb);
3751 }
3752
3753 return NETDEV_TX_OK;
3754 }
3755
3756 /* in broadcast mode, we send everything to all usable interfaces. */
3757 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3758 {
3759 struct bonding *bond = netdev_priv(bond_dev);
3760 struct slave *slave = NULL;
3761 struct list_head *iter;
3762
3763 bond_for_each_slave_rcu(bond, slave, iter) {
3764 if (bond_is_last_slave(bond, slave))
3765 break;
3766 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3767 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3768
3769 if (!skb2) {
3770 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3771 bond_dev->name, __func__);
3772 continue;
3773 }
3774 bond_dev_queue_xmit(bond, skb2, slave->dev);
3775 }
3776 }
3777 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3778 bond_dev_queue_xmit(bond, skb, slave->dev);
3779 else
3780 bond_tx_drop(bond_dev, skb);
3781
3782 return NETDEV_TX_OK;
3783 }
3784
3785 /*------------------------- Device initialization ---------------------------*/
3786
3787 /* Lookup the slave that corresponds to a qid */
3788 static inline int bond_slave_override(struct bonding *bond,
3789 struct sk_buff *skb)
3790 {
3791 struct slave *slave = NULL;
3792 struct list_head *iter;
3793
3794 if (!skb->queue_mapping)
3795 return 1;
3796
3797 /* Find out if any slaves have the same mapping as this skb. */
3798 bond_for_each_slave_rcu(bond, slave, iter) {
3799 if (slave->queue_id == skb->queue_mapping) {
3800 if (bond_slave_can_tx(slave)) {
3801 bond_dev_queue_xmit(bond, skb, slave->dev);
3802 return 0;
3803 }
3804 /* If the slave isn't UP, use default transmit policy. */
3805 break;
3806 }
3807 }
3808
3809 return 1;
3810 }
3811
3812
3813 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3814 void *accel_priv, select_queue_fallback_t fallback)
3815 {
3816 /* This helper function exists to help dev_pick_tx get the correct
3817 * destination queue. Using a helper function skips a call to
3818 * skb_tx_hash and will put the skbs in the queue we expect on their
3819 * way down to the bonding driver.
3820 */
3821 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3822
3823 /* Save the original txq to restore before passing to the driver */
3824 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3825
3826 if (unlikely(txq >= dev->real_num_tx_queues)) {
3827 do {
3828 txq -= dev->real_num_tx_queues;
3829 } while (txq >= dev->real_num_tx_queues);
3830 }
3831 return txq;
3832 }
3833
3834 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3835 {
3836 struct bonding *bond = netdev_priv(dev);
3837
3838 if (bond_should_override_tx_queue(bond) &&
3839 !bond_slave_override(bond, skb))
3840 return NETDEV_TX_OK;
3841
3842 switch (BOND_MODE(bond)) {
3843 case BOND_MODE_ROUNDROBIN:
3844 return bond_xmit_roundrobin(skb, dev);
3845 case BOND_MODE_ACTIVEBACKUP:
3846 return bond_xmit_activebackup(skb, dev);
3847 case BOND_MODE_8023AD:
3848 case BOND_MODE_XOR:
3849 return bond_3ad_xor_xmit(skb, dev);
3850 case BOND_MODE_BROADCAST:
3851 return bond_xmit_broadcast(skb, dev);
3852 case BOND_MODE_ALB:
3853 return bond_alb_xmit(skb, dev);
3854 case BOND_MODE_TLB:
3855 return bond_tlb_xmit(skb, dev);
3856 default:
3857 /* Should never happen, mode already checked */
3858 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
3859 WARN_ON_ONCE(1);
3860 bond_tx_drop(dev, skb);
3861 return NETDEV_TX_OK;
3862 }
3863 }
3864
3865 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3866 {
3867 struct bonding *bond = netdev_priv(dev);
3868 netdev_tx_t ret = NETDEV_TX_OK;
3869
3870 /* If we risk deadlock from transmitting this in the
3871 * netpoll path, tell netpoll to queue the frame for later tx
3872 */
3873 if (unlikely(is_netpoll_tx_blocked(dev)))
3874 return NETDEV_TX_BUSY;
3875
3876 rcu_read_lock();
3877 if (bond_has_slaves(bond))
3878 ret = __bond_start_xmit(skb, dev);
3879 else
3880 bond_tx_drop(dev, skb);
3881 rcu_read_unlock();
3882
3883 return ret;
3884 }
3885
3886 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3887 struct ethtool_cmd *ecmd)
3888 {
3889 struct bonding *bond = netdev_priv(bond_dev);
3890 unsigned long speed = 0;
3891 struct list_head *iter;
3892 struct slave *slave;
3893
3894 ecmd->duplex = DUPLEX_UNKNOWN;
3895 ecmd->port = PORT_OTHER;
3896
3897 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
3898 * do not need to check mode. Though link speed might not represent
3899 * the true receive or transmit bandwidth (not all modes are symmetric)
3900 * this is an accurate maximum.
3901 */
3902 bond_for_each_slave(bond, slave, iter) {
3903 if (bond_slave_can_tx(slave)) {
3904 if (slave->speed != SPEED_UNKNOWN)
3905 speed += slave->speed;
3906 if (ecmd->duplex == DUPLEX_UNKNOWN &&
3907 slave->duplex != DUPLEX_UNKNOWN)
3908 ecmd->duplex = slave->duplex;
3909 }
3910 }
3911 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3912
3913 return 0;
3914 }
3915
3916 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3917 struct ethtool_drvinfo *drvinfo)
3918 {
3919 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3920 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3921 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3922 BOND_ABI_VERSION);
3923 }
3924
3925 static const struct ethtool_ops bond_ethtool_ops = {
3926 .get_drvinfo = bond_ethtool_get_drvinfo,
3927 .get_settings = bond_ethtool_get_settings,
3928 .get_link = ethtool_op_get_link,
3929 };
3930
3931 static const struct net_device_ops bond_netdev_ops = {
3932 .ndo_init = bond_init,
3933 .ndo_uninit = bond_uninit,
3934 .ndo_open = bond_open,
3935 .ndo_stop = bond_close,
3936 .ndo_start_xmit = bond_start_xmit,
3937 .ndo_select_queue = bond_select_queue,
3938 .ndo_get_stats64 = bond_get_stats,
3939 .ndo_do_ioctl = bond_do_ioctl,
3940 .ndo_change_rx_flags = bond_change_rx_flags,
3941 .ndo_set_rx_mode = bond_set_rx_mode,
3942 .ndo_change_mtu = bond_change_mtu,
3943 .ndo_set_mac_address = bond_set_mac_address,
3944 .ndo_neigh_setup = bond_neigh_setup,
3945 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
3946 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
3947 #ifdef CONFIG_NET_POLL_CONTROLLER
3948 .ndo_netpoll_setup = bond_netpoll_setup,
3949 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
3950 .ndo_poll_controller = bond_poll_controller,
3951 #endif
3952 .ndo_add_slave = bond_enslave,
3953 .ndo_del_slave = bond_release,
3954 .ndo_fix_features = bond_fix_features,
3955 };
3956
3957 static const struct device_type bond_type = {
3958 .name = "bond",
3959 };
3960
3961 static void bond_destructor(struct net_device *bond_dev)
3962 {
3963 struct bonding *bond = netdev_priv(bond_dev);
3964 if (bond->wq)
3965 destroy_workqueue(bond->wq);
3966 free_netdev(bond_dev);
3967 }
3968
3969 void bond_setup(struct net_device *bond_dev)
3970 {
3971 struct bonding *bond = netdev_priv(bond_dev);
3972
3973 spin_lock_init(&bond->mode_lock);
3974 bond->params = bonding_defaults;
3975
3976 /* Initialize pointers */
3977 bond->dev = bond_dev;
3978
3979 /* Initialize the device entry points */
3980 ether_setup(bond_dev);
3981 bond_dev->netdev_ops = &bond_netdev_ops;
3982 bond_dev->ethtool_ops = &bond_ethtool_ops;
3983
3984 bond_dev->destructor = bond_destructor;
3985
3986 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
3987
3988 /* Initialize the device options */
3989 bond_dev->tx_queue_len = 0;
3990 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
3991 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT;
3992 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
3993
3994 /* don't acquire bond device's netif_tx_lock when transmitting */
3995 bond_dev->features |= NETIF_F_LLTX;
3996
3997 /* By default, we declare the bond to be fully
3998 * VLAN hardware accelerated capable. Special
3999 * care is taken in the various xmit functions
4000 * when there are slaves that are not hw accel
4001 * capable
4002 */
4003
4004 /* Don't allow bond devices to change network namespaces. */
4005 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4006
4007 bond_dev->hw_features = BOND_VLAN_FEATURES |
4008 NETIF_F_HW_VLAN_CTAG_TX |
4009 NETIF_F_HW_VLAN_CTAG_RX |
4010 NETIF_F_HW_VLAN_CTAG_FILTER;
4011
4012 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4013 bond_dev->hw_features |= NETIF_F_GSO_UDP_TUNNEL;
4014 bond_dev->features |= bond_dev->hw_features;
4015 }
4016
4017 /* Destroy a bonding device.
4018 * Must be under rtnl_lock when this function is called.
4019 */
4020 static void bond_uninit(struct net_device *bond_dev)
4021 {
4022 struct bonding *bond = netdev_priv(bond_dev);
4023 struct list_head *iter;
4024 struct slave *slave;
4025 struct bond_up_slave *arr;
4026
4027 bond_netpoll_cleanup(bond_dev);
4028
4029 /* Release the bonded slaves */
4030 bond_for_each_slave(bond, slave, iter)
4031 __bond_release_one(bond_dev, slave->dev, true);
4032 netdev_info(bond_dev, "Released all slaves\n");
4033
4034 arr = rtnl_dereference(bond->slave_arr);
4035 if (arr) {
4036 RCU_INIT_POINTER(bond->slave_arr, NULL);
4037 kfree_rcu(arr, rcu);
4038 }
4039
4040 list_del(&bond->bond_list);
4041
4042 bond_debug_unregister(bond);
4043 }
4044
4045 /*------------------------- Module initialization ---------------------------*/
4046
4047 static int bond_check_params(struct bond_params *params)
4048 {
4049 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4050 struct bond_opt_value newval;
4051 const struct bond_opt_value *valptr;
4052 int arp_all_targets_value;
4053
4054 /* Convert string parameters. */
4055 if (mode) {
4056 bond_opt_initstr(&newval, mode);
4057 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4058 if (!valptr) {
4059 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4060 return -EINVAL;
4061 }
4062 bond_mode = valptr->value;
4063 }
4064
4065 if (xmit_hash_policy) {
4066 if ((bond_mode != BOND_MODE_XOR) &&
4067 (bond_mode != BOND_MODE_8023AD) &&
4068 (bond_mode != BOND_MODE_TLB)) {
4069 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4070 bond_mode_name(bond_mode));
4071 } else {
4072 bond_opt_initstr(&newval, xmit_hash_policy);
4073 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4074 &newval);
4075 if (!valptr) {
4076 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4077 xmit_hash_policy);
4078 return -EINVAL;
4079 }
4080 xmit_hashtype = valptr->value;
4081 }
4082 }
4083
4084 if (lacp_rate) {
4085 if (bond_mode != BOND_MODE_8023AD) {
4086 pr_info("lacp_rate param is irrelevant in mode %s\n",
4087 bond_mode_name(bond_mode));
4088 } else {
4089 bond_opt_initstr(&newval, lacp_rate);
4090 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4091 &newval);
4092 if (!valptr) {
4093 pr_err("Error: Invalid lacp rate \"%s\"\n",
4094 lacp_rate);
4095 return -EINVAL;
4096 }
4097 lacp_fast = valptr->value;
4098 }
4099 }
4100
4101 if (ad_select) {
4102 bond_opt_initstr(&newval, ad_select);
4103 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4104 &newval);
4105 if (!valptr) {
4106 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4107 return -EINVAL;
4108 }
4109 params->ad_select = valptr->value;
4110 if (bond_mode != BOND_MODE_8023AD)
4111 pr_warn("ad_select param only affects 802.3ad mode\n");
4112 } else {
4113 params->ad_select = BOND_AD_STABLE;
4114 }
4115
4116 if (max_bonds < 0) {
4117 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4118 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4119 max_bonds = BOND_DEFAULT_MAX_BONDS;
4120 }
4121
4122 if (miimon < 0) {
4123 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4124 miimon, INT_MAX);
4125 miimon = 0;
4126 }
4127
4128 if (updelay < 0) {
4129 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4130 updelay, INT_MAX);
4131 updelay = 0;
4132 }
4133
4134 if (downdelay < 0) {
4135 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4136 downdelay, INT_MAX);
4137 downdelay = 0;
4138 }
4139
4140 if ((use_carrier != 0) && (use_carrier != 1)) {
4141 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4142 use_carrier);
4143 use_carrier = 1;
4144 }
4145
4146 if (num_peer_notif < 0 || num_peer_notif > 255) {
4147 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4148 num_peer_notif);
4149 num_peer_notif = 1;
4150 }
4151
4152 /* reset values for 802.3ad/TLB/ALB */
4153 if (!bond_mode_uses_arp(bond_mode)) {
4154 if (!miimon) {
4155 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");
4156 pr_warn("Forcing miimon to 100msec\n");
4157 miimon = BOND_DEFAULT_MIIMON;
4158 }
4159 }
4160
4161 if (tx_queues < 1 || tx_queues > 255) {
4162 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4163 tx_queues, BOND_DEFAULT_TX_QUEUES);
4164 tx_queues = BOND_DEFAULT_TX_QUEUES;
4165 }
4166
4167 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4168 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4169 all_slaves_active);
4170 all_slaves_active = 0;
4171 }
4172
4173 if (resend_igmp < 0 || resend_igmp > 255) {
4174 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4175 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4176 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4177 }
4178
4179 bond_opt_initval(&newval, packets_per_slave);
4180 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4181 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4182 packets_per_slave, USHRT_MAX);
4183 packets_per_slave = 1;
4184 }
4185
4186 if (bond_mode == BOND_MODE_ALB) {
4187 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",
4188 updelay);
4189 }
4190
4191 if (!miimon) {
4192 if (updelay || downdelay) {
4193 /* just warn the user the up/down delay will have
4194 * no effect since miimon is zero...
4195 */
4196 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",
4197 updelay, downdelay);
4198 }
4199 } else {
4200 /* don't allow arp monitoring */
4201 if (arp_interval) {
4202 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4203 miimon, arp_interval);
4204 arp_interval = 0;
4205 }
4206
4207 if ((updelay % miimon) != 0) {
4208 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4209 updelay, miimon, (updelay / miimon) * miimon);
4210 }
4211
4212 updelay /= miimon;
4213
4214 if ((downdelay % miimon) != 0) {
4215 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4216 downdelay, miimon,
4217 (downdelay / miimon) * miimon);
4218 }
4219
4220 downdelay /= miimon;
4221 }
4222
4223 if (arp_interval < 0) {
4224 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4225 arp_interval, INT_MAX);
4226 arp_interval = 0;
4227 }
4228
4229 for (arp_ip_count = 0, i = 0;
4230 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4231 __be32 ip;
4232
4233 /* not a complete check, but good enough to catch mistakes */
4234 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4235 !bond_is_ip_target_ok(ip)) {
4236 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4237 arp_ip_target[i]);
4238 arp_interval = 0;
4239 } else {
4240 if (bond_get_targets_ip(arp_target, ip) == -1)
4241 arp_target[arp_ip_count++] = ip;
4242 else
4243 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4244 &ip);
4245 }
4246 }
4247
4248 if (arp_interval && !arp_ip_count) {
4249 /* don't allow arping if no arp_ip_target given... */
4250 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4251 arp_interval);
4252 arp_interval = 0;
4253 }
4254
4255 if (arp_validate) {
4256 if (!arp_interval) {
4257 pr_err("arp_validate requires arp_interval\n");
4258 return -EINVAL;
4259 }
4260
4261 bond_opt_initstr(&newval, arp_validate);
4262 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4263 &newval);
4264 if (!valptr) {
4265 pr_err("Error: invalid arp_validate \"%s\"\n",
4266 arp_validate);
4267 return -EINVAL;
4268 }
4269 arp_validate_value = valptr->value;
4270 } else {
4271 arp_validate_value = 0;
4272 }
4273
4274 arp_all_targets_value = 0;
4275 if (arp_all_targets) {
4276 bond_opt_initstr(&newval, arp_all_targets);
4277 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4278 &newval);
4279 if (!valptr) {
4280 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4281 arp_all_targets);
4282 arp_all_targets_value = 0;
4283 } else {
4284 arp_all_targets_value = valptr->value;
4285 }
4286 }
4287
4288 if (miimon) {
4289 pr_info("MII link monitoring set to %d ms\n", miimon);
4290 } else if (arp_interval) {
4291 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4292 arp_validate_value);
4293 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4294 arp_interval, valptr->string, arp_ip_count);
4295
4296 for (i = 0; i < arp_ip_count; i++)
4297 pr_cont(" %s", arp_ip_target[i]);
4298
4299 pr_cont("\n");
4300
4301 } else if (max_bonds) {
4302 /* miimon and arp_interval not set, we need one so things
4303 * work as expected, see bonding.txt for details
4304 */
4305 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");
4306 }
4307
4308 if (primary && !bond_mode_uses_primary(bond_mode)) {
4309 /* currently, using a primary only makes sense
4310 * in active backup, TLB or ALB modes
4311 */
4312 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4313 primary, bond_mode_name(bond_mode));
4314 primary = NULL;
4315 }
4316
4317 if (primary && primary_reselect) {
4318 bond_opt_initstr(&newval, primary_reselect);
4319 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4320 &newval);
4321 if (!valptr) {
4322 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4323 primary_reselect);
4324 return -EINVAL;
4325 }
4326 primary_reselect_value = valptr->value;
4327 } else {
4328 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4329 }
4330
4331 if (fail_over_mac) {
4332 bond_opt_initstr(&newval, fail_over_mac);
4333 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4334 &newval);
4335 if (!valptr) {
4336 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4337 fail_over_mac);
4338 return -EINVAL;
4339 }
4340 fail_over_mac_value = valptr->value;
4341 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4342 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4343 } else {
4344 fail_over_mac_value = BOND_FOM_NONE;
4345 }
4346
4347 if (lp_interval == 0) {
4348 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4349 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4350 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4351 }
4352
4353 /* fill params struct with the proper values */
4354 params->mode = bond_mode;
4355 params->xmit_policy = xmit_hashtype;
4356 params->miimon = miimon;
4357 params->num_peer_notif = num_peer_notif;
4358 params->arp_interval = arp_interval;
4359 params->arp_validate = arp_validate_value;
4360 params->arp_all_targets = arp_all_targets_value;
4361 params->updelay = updelay;
4362 params->downdelay = downdelay;
4363 params->use_carrier = use_carrier;
4364 params->lacp_fast = lacp_fast;
4365 params->primary[0] = 0;
4366 params->primary_reselect = primary_reselect_value;
4367 params->fail_over_mac = fail_over_mac_value;
4368 params->tx_queues = tx_queues;
4369 params->all_slaves_active = all_slaves_active;
4370 params->resend_igmp = resend_igmp;
4371 params->min_links = min_links;
4372 params->lp_interval = lp_interval;
4373 params->packets_per_slave = packets_per_slave;
4374 params->tlb_dynamic_lb = 1; /* Default value */
4375 if (packets_per_slave > 0) {
4376 params->reciprocal_packets_per_slave =
4377 reciprocal_value(packets_per_slave);
4378 } else {
4379 /* reciprocal_packets_per_slave is unused if
4380 * packets_per_slave is 0 or 1, just initialize it
4381 */
4382 params->reciprocal_packets_per_slave =
4383 (struct reciprocal_value) { 0 };
4384 }
4385
4386 if (primary) {
4387 strncpy(params->primary, primary, IFNAMSIZ);
4388 params->primary[IFNAMSIZ - 1] = 0;
4389 }
4390
4391 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4392
4393 return 0;
4394 }
4395
4396 static struct lock_class_key bonding_netdev_xmit_lock_key;
4397 static struct lock_class_key bonding_netdev_addr_lock_key;
4398 static struct lock_class_key bonding_tx_busylock_key;
4399
4400 static void bond_set_lockdep_class_one(struct net_device *dev,
4401 struct netdev_queue *txq,
4402 void *_unused)
4403 {
4404 lockdep_set_class(&txq->_xmit_lock,
4405 &bonding_netdev_xmit_lock_key);
4406 }
4407
4408 static void bond_set_lockdep_class(struct net_device *dev)
4409 {
4410 lockdep_set_class(&dev->addr_list_lock,
4411 &bonding_netdev_addr_lock_key);
4412 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4413 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4414 }
4415
4416 /* Called from registration process */
4417 static int bond_init(struct net_device *bond_dev)
4418 {
4419 struct bonding *bond = netdev_priv(bond_dev);
4420 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4421
4422 netdev_dbg(bond_dev, "Begin bond_init\n");
4423
4424 bond->wq = create_singlethread_workqueue(bond_dev->name);
4425 if (!bond->wq)
4426 return -ENOMEM;
4427
4428 bond_set_lockdep_class(bond_dev);
4429
4430 list_add_tail(&bond->bond_list, &bn->dev_list);
4431
4432 bond_prepare_sysfs_group(bond);
4433
4434 bond_debug_register(bond);
4435
4436 /* Ensure valid dev_addr */
4437 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4438 bond_dev->addr_assign_type == NET_ADDR_PERM)
4439 eth_hw_addr_random(bond_dev);
4440
4441 return 0;
4442 }
4443
4444 unsigned int bond_get_num_tx_queues(void)
4445 {
4446 return tx_queues;
4447 }
4448
4449 /* Create a new bond based on the specified name and bonding parameters.
4450 * If name is NULL, obtain a suitable "bond%d" name for us.
4451 * Caller must NOT hold rtnl_lock; we need to release it here before we
4452 * set up our sysfs entries.
4453 */
4454 int bond_create(struct net *net, const char *name)
4455 {
4456 struct net_device *bond_dev;
4457 int res;
4458
4459 rtnl_lock();
4460
4461 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4462 name ? name : "bond%d", NET_NAME_UNKNOWN,
4463 bond_setup, tx_queues);
4464 if (!bond_dev) {
4465 pr_err("%s: eek! can't alloc netdev!\n", name);
4466 rtnl_unlock();
4467 return -ENOMEM;
4468 }
4469
4470 dev_net_set(bond_dev, net);
4471 bond_dev->rtnl_link_ops = &bond_link_ops;
4472
4473 res = register_netdevice(bond_dev);
4474
4475 netif_carrier_off(bond_dev);
4476
4477 rtnl_unlock();
4478 if (res < 0)
4479 bond_destructor(bond_dev);
4480 return res;
4481 }
4482
4483 static int __net_init bond_net_init(struct net *net)
4484 {
4485 struct bond_net *bn = net_generic(net, bond_net_id);
4486
4487 bn->net = net;
4488 INIT_LIST_HEAD(&bn->dev_list);
4489
4490 bond_create_proc_dir(bn);
4491 bond_create_sysfs(bn);
4492
4493 return 0;
4494 }
4495
4496 static void __net_exit bond_net_exit(struct net *net)
4497 {
4498 struct bond_net *bn = net_generic(net, bond_net_id);
4499 struct bonding *bond, *tmp_bond;
4500 LIST_HEAD(list);
4501
4502 bond_destroy_sysfs(bn);
4503
4504 /* Kill off any bonds created after unregistering bond rtnl ops */
4505 rtnl_lock();
4506 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4507 unregister_netdevice_queue(bond->dev, &list);
4508 unregister_netdevice_many(&list);
4509 rtnl_unlock();
4510
4511 bond_destroy_proc_dir(bn);
4512 }
4513
4514 static struct pernet_operations bond_net_ops = {
4515 .init = bond_net_init,
4516 .exit = bond_net_exit,
4517 .id = &bond_net_id,
4518 .size = sizeof(struct bond_net),
4519 };
4520
4521 static int __init bonding_init(void)
4522 {
4523 int i;
4524 int res;
4525
4526 pr_info("%s", bond_version);
4527
4528 res = bond_check_params(&bonding_defaults);
4529 if (res)
4530 goto out;
4531
4532 res = register_pernet_subsys(&bond_net_ops);
4533 if (res)
4534 goto out;
4535
4536 res = bond_netlink_init();
4537 if (res)
4538 goto err_link;
4539
4540 bond_create_debugfs();
4541
4542 for (i = 0; i < max_bonds; i++) {
4543 res = bond_create(&init_net, NULL);
4544 if (res)
4545 goto err;
4546 }
4547
4548 register_netdevice_notifier(&bond_netdev_notifier);
4549 out:
4550 return res;
4551 err:
4552 bond_destroy_debugfs();
4553 bond_netlink_fini();
4554 err_link:
4555 unregister_pernet_subsys(&bond_net_ops);
4556 goto out;
4557
4558 }
4559
4560 static void __exit bonding_exit(void)
4561 {
4562 unregister_netdevice_notifier(&bond_netdev_notifier);
4563
4564 bond_destroy_debugfs();
4565
4566 bond_netlink_fini();
4567 unregister_pernet_subsys(&bond_net_ops);
4568
4569 #ifdef CONFIG_NET_POLL_CONTROLLER
4570 /* Make sure we don't have an imbalance on our netpoll blocking */
4571 WARN_ON(atomic_read(&netpoll_block_tx));
4572 #endif
4573 }
4574
4575 module_init(bonding_init);
4576 module_exit(bonding_exit);
4577 MODULE_LICENSE("GPL");
4578 MODULE_VERSION(DRV_VERSION);
4579 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4580 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
Linux with added FPC-III support