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[deliverable/linux.git] / drivers / net / bonding / bond_main.c
1 /*
2 * originally based on the dummy device.
3 *
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
6 *
7 * bonding.c: an Ethernet Bonding driver
8 *
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
10 * Cisco 5500
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
13 * Linux Bonding
14 * and probably many L2 switches ...
15 *
16 * How it works:
17 * ifconfig bond0 ipaddress netmask up
18 * will setup a network device, with an ip address. No mac address
19 * will be assigned at this time. The hw mac address will come from
20 * the first slave bonded to the channel. All slaves will then use
21 * this hw mac address.
22 *
23 * ifconfig bond0 down
24 * will release all slaves, marking them as down.
25 *
26 * ifenslave bond0 eth0
27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either
28 * a: be used as initial mac address
29 * b: if a hw mac address already is there, eth0's hw mac address
30 * will then be set from bond0.
31 *
32 */
33
34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
35
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/types.h>
39 #include <linux/fcntl.h>
40 #include <linux/interrupt.h>
41 #include <linux/ptrace.h>
42 #include <linux/ioport.h>
43 #include <linux/in.h>
44 #include <net/ip.h>
45 #include <linux/ip.h>
46 #include <linux/tcp.h>
47 #include <linux/udp.h>
48 #include <linux/slab.h>
49 #include <linux/string.h>
50 #include <linux/init.h>
51 #include <linux/timer.h>
52 #include <linux/socket.h>
53 #include <linux/ctype.h>
54 #include <linux/inet.h>
55 #include <linux/bitops.h>
56 #include <linux/io.h>
57 #include <asm/dma.h>
58 #include <linux/uaccess.h>
59 #include <linux/errno.h>
60 #include <linux/netdevice.h>
61 #include <linux/inetdevice.h>
62 #include <linux/igmp.h>
63 #include <linux/etherdevice.h>
64 #include <linux/skbuff.h>
65 #include <net/sock.h>
66 #include <linux/rtnetlink.h>
67 #include <linux/smp.h>
68 #include <linux/if_ether.h>
69 #include <net/arp.h>
70 #include <linux/mii.h>
71 #include <linux/ethtool.h>
72 #include <linux/if_vlan.h>
73 #include <linux/if_bonding.h>
74 #include <linux/jiffies.h>
75 #include <linux/preempt.h>
76 #include <net/route.h>
77 #include <net/net_namespace.h>
78 #include <net/netns/generic.h>
79 #include <net/pkt_sched.h>
80 #include "bonding.h"
81 #include "bond_3ad.h"
82 #include "bond_alb.h"
83
84 /*---------------------------- Module parameters ----------------------------*/
85
86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
87 #define BOND_LINK_MON_INTERV 0
88 #define BOND_LINK_ARP_INTERV 0
89
90 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
91 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
92 static int num_peer_notif = 1;
93 static int miimon = BOND_LINK_MON_INTERV;
94 static int updelay;
95 static int downdelay;
96 static int use_carrier = 1;
97 static char *mode;
98 static char *primary;
99 static char *primary_reselect;
100 static char *lacp_rate;
101 static int min_links;
102 static char *ad_select;
103 static char *xmit_hash_policy;
104 static int arp_interval = BOND_LINK_ARP_INTERV;
105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
106 static char *arp_validate;
107 static char *arp_all_targets;
108 static char *fail_over_mac;
109 static int all_slaves_active;
110 static struct bond_params bonding_defaults;
111 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
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");
162 module_param(arp_interval, int, 0);
163 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
164 module_param_array(arp_ip_target, charp, NULL, 0);
165 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
166 module_param(arp_validate, charp, 0);
167 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
168 "0 for none (default), 1 for active, "
169 "2 for backup, 3 for all");
170 module_param(arp_all_targets, charp, 0);
171 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
172 module_param(fail_over_mac, charp, 0);
173 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
174 "the same MAC; 0 for none (default), "
175 "1 for active, 2 for follow");
176 module_param(all_slaves_active, int, 0);
177 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
178 "by setting active flag for all slaves; "
179 "0 for never (default), 1 for always.");
180 module_param(resend_igmp, int, 0);
181 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
182 "link failure");
183
184 /*----------------------------- Global variables ----------------------------*/
185
186 #ifdef CONFIG_NET_POLL_CONTROLLER
187 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
188 #endif
189
190 int bond_net_id __read_mostly;
191
192 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
193 static int arp_ip_count;
194 static int bond_mode = BOND_MODE_ROUNDROBIN;
195 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
196 static int lacp_fast;
197
198 const struct bond_parm_tbl bond_lacp_tbl[] = {
199 { "slow", AD_LACP_SLOW},
200 { "fast", AD_LACP_FAST},
201 { NULL, -1},
202 };
203
204 const struct bond_parm_tbl bond_mode_tbl[] = {
205 { "balance-rr", BOND_MODE_ROUNDROBIN},
206 { "active-backup", BOND_MODE_ACTIVEBACKUP},
207 { "balance-xor", BOND_MODE_XOR},
208 { "broadcast", BOND_MODE_BROADCAST},
209 { "802.3ad", BOND_MODE_8023AD},
210 { "balance-tlb", BOND_MODE_TLB},
211 { "balance-alb", BOND_MODE_ALB},
212 { NULL, -1},
213 };
214
215 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
216 { "layer2", BOND_XMIT_POLICY_LAYER2},
217 { "layer3+4", BOND_XMIT_POLICY_LAYER34},
218 { "layer2+3", BOND_XMIT_POLICY_LAYER23},
219 { NULL, -1},
220 };
221
222 const struct bond_parm_tbl arp_all_targets_tbl[] = {
223 { "any", BOND_ARP_TARGETS_ANY},
224 { "all", BOND_ARP_TARGETS_ALL},
225 { NULL, -1},
226 };
227
228 const struct bond_parm_tbl arp_validate_tbl[] = {
229 { "none", BOND_ARP_VALIDATE_NONE},
230 { "active", BOND_ARP_VALIDATE_ACTIVE},
231 { "backup", BOND_ARP_VALIDATE_BACKUP},
232 { "all", BOND_ARP_VALIDATE_ALL},
233 { NULL, -1},
234 };
235
236 const struct bond_parm_tbl fail_over_mac_tbl[] = {
237 { "none", BOND_FOM_NONE},
238 { "active", BOND_FOM_ACTIVE},
239 { "follow", BOND_FOM_FOLLOW},
240 { NULL, -1},
241 };
242
243 const struct bond_parm_tbl pri_reselect_tbl[] = {
244 { "always", BOND_PRI_RESELECT_ALWAYS},
245 { "better", BOND_PRI_RESELECT_BETTER},
246 { "failure", BOND_PRI_RESELECT_FAILURE},
247 { NULL, -1},
248 };
249
250 struct bond_parm_tbl ad_select_tbl[] = {
251 { "stable", BOND_AD_STABLE},
252 { "bandwidth", BOND_AD_BANDWIDTH},
253 { "count", BOND_AD_COUNT},
254 { NULL, -1},
255 };
256
257 /*-------------------------- Forward declarations ---------------------------*/
258
259 static int bond_init(struct net_device *bond_dev);
260 static void bond_uninit(struct net_device *bond_dev);
261
262 /*---------------------------- General routines -----------------------------*/
263
264 const char *bond_mode_name(int mode)
265 {
266 static const char *names[] = {
267 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
268 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
269 [BOND_MODE_XOR] = "load balancing (xor)",
270 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
271 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
272 [BOND_MODE_TLB] = "transmit load balancing",
273 [BOND_MODE_ALB] = "adaptive load balancing",
274 };
275
276 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
277 return "unknown";
278
279 return names[mode];
280 }
281
282 /*---------------------------------- VLAN -----------------------------------*/
283
284 /**
285 * bond_add_vlan - add a new vlan id on bond
286 * @bond: bond that got the notification
287 * @vlan_id: the vlan id to add
288 *
289 * Returns -ENOMEM if allocation failed.
290 */
291 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
292 {
293 struct vlan_entry *vlan;
294
295 pr_debug("bond: %s, vlan id %d\n",
296 (bond ? bond->dev->name : "None"), vlan_id);
297
298 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
299 if (!vlan)
300 return -ENOMEM;
301
302 INIT_LIST_HEAD(&vlan->vlan_list);
303 vlan->vlan_id = vlan_id;
304
305 write_lock_bh(&bond->lock);
306
307 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
308
309 write_unlock_bh(&bond->lock);
310
311 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
312
313 return 0;
314 }
315
316 /**
317 * bond_del_vlan - delete a vlan id from bond
318 * @bond: bond that got the notification
319 * @vlan_id: the vlan id to delete
320 *
321 * returns -ENODEV if @vlan_id was not found in @bond.
322 */
323 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
324 {
325 struct vlan_entry *vlan;
326 int res = -ENODEV;
327
328 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
329
330 block_netpoll_tx();
331 write_lock_bh(&bond->lock);
332
333 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
334 if (vlan->vlan_id == vlan_id) {
335 list_del(&vlan->vlan_list);
336
337 if (bond_is_lb(bond))
338 bond_alb_clear_vlan(bond, vlan_id);
339
340 pr_debug("removed VLAN ID %d from bond %s\n",
341 vlan_id, bond->dev->name);
342
343 kfree(vlan);
344
345 res = 0;
346 goto out;
347 }
348 }
349
350 pr_debug("couldn't find VLAN ID %d in bond %s\n",
351 vlan_id, bond->dev->name);
352
353 out:
354 write_unlock_bh(&bond->lock);
355 unblock_netpoll_tx();
356 return res;
357 }
358
359 /**
360 * bond_next_vlan - safely skip to the next item in the vlans list.
361 * @bond: the bond we're working on
362 * @curr: item we're advancing from
363 *
364 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
365 * or @curr->next otherwise (even if it is @curr itself again).
366 *
367 * Caller must hold bond->lock
368 */
369 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
370 {
371 struct vlan_entry *next, *last;
372
373 if (list_empty(&bond->vlan_list))
374 return NULL;
375
376 if (!curr) {
377 next = list_entry(bond->vlan_list.next,
378 struct vlan_entry, vlan_list);
379 } else {
380 last = list_entry(bond->vlan_list.prev,
381 struct vlan_entry, vlan_list);
382 if (last == curr) {
383 next = list_entry(bond->vlan_list.next,
384 struct vlan_entry, vlan_list);
385 } else {
386 next = list_entry(curr->vlan_list.next,
387 struct vlan_entry, vlan_list);
388 }
389 }
390
391 return next;
392 }
393
394 /**
395 * bond_dev_queue_xmit - Prepare skb for xmit.
396 *
397 * @bond: bond device that got this skb for tx.
398 * @skb: hw accel VLAN tagged skb to transmit
399 * @slave_dev: slave that is supposed to xmit this skbuff
400 */
401 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
402 struct net_device *slave_dev)
403 {
404 skb->dev = slave_dev;
405
406 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
407 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
408 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
409
410 if (unlikely(netpoll_tx_running(bond->dev)))
411 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
412 else
413 dev_queue_xmit(skb);
414
415 return 0;
416 }
417
418 /*
419 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
420 * We don't protect the slave list iteration with a lock because:
421 * a. This operation is performed in IOCTL context,
422 * b. The operation is protected by the RTNL semaphore in the 8021q code,
423 * c. Holding a lock with BH disabled while directly calling a base driver
424 * entry point is generally a BAD idea.
425 *
426 * The design of synchronization/protection for this operation in the 8021q
427 * module is good for one or more VLAN devices over a single physical device
428 * and cannot be extended for a teaming solution like bonding, so there is a
429 * potential race condition here where a net device from the vlan group might
430 * be referenced (either by a base driver or the 8021q code) while it is being
431 * removed from the system. However, it turns out we're not making matters
432 * worse, and if it works for regular VLAN usage it will work here too.
433 */
434
435 /**
436 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
437 * @bond_dev: bonding net device that got called
438 * @vid: vlan id being added
439 */
440 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
441 __be16 proto, u16 vid)
442 {
443 struct bonding *bond = netdev_priv(bond_dev);
444 struct slave *slave;
445 int res;
446
447 bond_for_each_slave(bond, slave) {
448 res = vlan_vid_add(slave->dev, proto, vid);
449 if (res)
450 goto unwind;
451 }
452
453 res = bond_add_vlan(bond, vid);
454 if (res) {
455 pr_err("%s: Error: Failed to add vlan id %d\n",
456 bond_dev->name, vid);
457 return res;
458 }
459
460 return 0;
461
462 unwind:
463 /* unwind from head to the slave that failed */
464 bond_for_each_slave_continue_reverse(bond, slave)
465 vlan_vid_del(slave->dev, proto, vid);
466
467 return res;
468 }
469
470 /**
471 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
472 * @bond_dev: bonding net device that got called
473 * @vid: vlan id being removed
474 */
475 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
476 __be16 proto, u16 vid)
477 {
478 struct bonding *bond = netdev_priv(bond_dev);
479 struct slave *slave;
480 int res;
481
482 bond_for_each_slave(bond, slave)
483 vlan_vid_del(slave->dev, proto, vid);
484
485 res = bond_del_vlan(bond, vid);
486 if (res) {
487 pr_err("%s: Error: Failed to remove vlan id %d\n",
488 bond_dev->name, vid);
489 return res;
490 }
491
492 return 0;
493 }
494
495 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
496 {
497 struct vlan_entry *vlan;
498 int res;
499
500 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
501 res = vlan_vid_add(slave_dev, htons(ETH_P_8021Q),
502 vlan->vlan_id);
503 if (res)
504 pr_warning("%s: Failed to add vlan id %d to device %s\n",
505 bond->dev->name, vlan->vlan_id,
506 slave_dev->name);
507 }
508 }
509
510 static void bond_del_vlans_from_slave(struct bonding *bond,
511 struct net_device *slave_dev)
512 {
513 struct vlan_entry *vlan;
514
515 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
516 if (!vlan->vlan_id)
517 continue;
518 vlan_vid_del(slave_dev, htons(ETH_P_8021Q), vlan->vlan_id);
519 }
520 }
521
522 /*------------------------------- Link status -------------------------------*/
523
524 /*
525 * Set the carrier state for the master according to the state of its
526 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
527 * do special 802.3ad magic.
528 *
529 * Returns zero if carrier state does not change, nonzero if it does.
530 */
531 static int bond_set_carrier(struct bonding *bond)
532 {
533 struct slave *slave;
534
535 if (list_empty(&bond->slave_list))
536 goto down;
537
538 if (bond->params.mode == BOND_MODE_8023AD)
539 return bond_3ad_set_carrier(bond);
540
541 bond_for_each_slave(bond, slave) {
542 if (slave->link == BOND_LINK_UP) {
543 if (!netif_carrier_ok(bond->dev)) {
544 netif_carrier_on(bond->dev);
545 return 1;
546 }
547 return 0;
548 }
549 }
550
551 down:
552 if (netif_carrier_ok(bond->dev)) {
553 netif_carrier_off(bond->dev);
554 return 1;
555 }
556 return 0;
557 }
558
559 /*
560 * Get link speed and duplex from the slave's base driver
561 * using ethtool. If for some reason the call fails or the
562 * values are invalid, set speed and duplex to -1,
563 * and return.
564 */
565 static void bond_update_speed_duplex(struct slave *slave)
566 {
567 struct net_device *slave_dev = slave->dev;
568 struct ethtool_cmd ecmd;
569 u32 slave_speed;
570 int res;
571
572 slave->speed = SPEED_UNKNOWN;
573 slave->duplex = DUPLEX_UNKNOWN;
574
575 res = __ethtool_get_settings(slave_dev, &ecmd);
576 if (res < 0)
577 return;
578
579 slave_speed = ethtool_cmd_speed(&ecmd);
580 if (slave_speed == 0 || slave_speed == ((__u32) -1))
581 return;
582
583 switch (ecmd.duplex) {
584 case DUPLEX_FULL:
585 case DUPLEX_HALF:
586 break;
587 default:
588 return;
589 }
590
591 slave->speed = slave_speed;
592 slave->duplex = ecmd.duplex;
593
594 return;
595 }
596
597 /*
598 * if <dev> supports MII link status reporting, check its link status.
599 *
600 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
601 * depending upon the setting of the use_carrier parameter.
602 *
603 * Return either BMSR_LSTATUS, meaning that the link is up (or we
604 * can't tell and just pretend it is), or 0, meaning that the link is
605 * down.
606 *
607 * If reporting is non-zero, instead of faking link up, return -1 if
608 * both ETHTOOL and MII ioctls fail (meaning the device does not
609 * support them). If use_carrier is set, return whatever it says.
610 * It'd be nice if there was a good way to tell if a driver supports
611 * netif_carrier, but there really isn't.
612 */
613 static int bond_check_dev_link(struct bonding *bond,
614 struct net_device *slave_dev, int reporting)
615 {
616 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
617 int (*ioctl)(struct net_device *, struct ifreq *, int);
618 struct ifreq ifr;
619 struct mii_ioctl_data *mii;
620
621 if (!reporting && !netif_running(slave_dev))
622 return 0;
623
624 if (bond->params.use_carrier)
625 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
626
627 /* Try to get link status using Ethtool first. */
628 if (slave_dev->ethtool_ops->get_link)
629 return slave_dev->ethtool_ops->get_link(slave_dev) ?
630 BMSR_LSTATUS : 0;
631
632 /* Ethtool can't be used, fallback to MII ioctls. */
633 ioctl = slave_ops->ndo_do_ioctl;
634 if (ioctl) {
635 /* TODO: set pointer to correct ioctl on a per team member */
636 /* bases to make this more efficient. that is, once */
637 /* we determine the correct ioctl, we will always */
638 /* call it and not the others for that team */
639 /* member. */
640
641 /*
642 * We cannot assume that SIOCGMIIPHY will also read a
643 * register; not all network drivers (e.g., e100)
644 * support that.
645 */
646
647 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
648 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
649 mii = if_mii(&ifr);
650 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
651 mii->reg_num = MII_BMSR;
652 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
653 return mii->val_out & BMSR_LSTATUS;
654 }
655 }
656
657 /*
658 * If reporting, report that either there's no dev->do_ioctl,
659 * or both SIOCGMIIREG and get_link failed (meaning that we
660 * cannot report link status). If not reporting, pretend
661 * we're ok.
662 */
663 return reporting ? -1 : BMSR_LSTATUS;
664 }
665
666 /*----------------------------- Multicast list ------------------------------*/
667
668 /*
669 * Push the promiscuity flag down to appropriate slaves
670 */
671 static int bond_set_promiscuity(struct bonding *bond, int inc)
672 {
673 int err = 0;
674 if (USES_PRIMARY(bond->params.mode)) {
675 /* write lock already acquired */
676 if (bond->curr_active_slave) {
677 err = dev_set_promiscuity(bond->curr_active_slave->dev,
678 inc);
679 }
680 } else {
681 struct slave *slave;
682
683 bond_for_each_slave(bond, slave) {
684 err = dev_set_promiscuity(slave->dev, inc);
685 if (err)
686 return err;
687 }
688 }
689 return err;
690 }
691
692 /*
693 * Push the allmulti flag down to all slaves
694 */
695 static int bond_set_allmulti(struct bonding *bond, int inc)
696 {
697 int err = 0;
698 if (USES_PRIMARY(bond->params.mode)) {
699 /* write lock already acquired */
700 if (bond->curr_active_slave) {
701 err = dev_set_allmulti(bond->curr_active_slave->dev,
702 inc);
703 }
704 } else {
705 struct slave *slave;
706
707 bond_for_each_slave(bond, slave) {
708 err = dev_set_allmulti(slave->dev, inc);
709 if (err)
710 return err;
711 }
712 }
713 return err;
714 }
715
716 /*
717 * Retrieve the list of registered multicast addresses for the bonding
718 * device and retransmit an IGMP JOIN request to the current active
719 * slave.
720 */
721 static void bond_resend_igmp_join_requests(struct bonding *bond)
722 {
723 if (!rtnl_trylock()) {
724 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
725 return;
726 }
727 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
728 rtnl_unlock();
729
730 /* We use curr_slave_lock to protect against concurrent access to
731 * igmp_retrans from multiple running instances of this function and
732 * bond_change_active_slave
733 */
734 write_lock_bh(&bond->curr_slave_lock);
735 if (bond->igmp_retrans > 1) {
736 bond->igmp_retrans--;
737 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
738 }
739 write_unlock_bh(&bond->curr_slave_lock);
740 }
741
742 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
743 {
744 struct bonding *bond = container_of(work, struct bonding,
745 mcast_work.work);
746
747 bond_resend_igmp_join_requests(bond);
748 }
749
750 /* Flush bond's hardware addresses from slave
751 */
752 static void bond_hw_addr_flush(struct net_device *bond_dev,
753 struct net_device *slave_dev)
754 {
755 struct bonding *bond = netdev_priv(bond_dev);
756
757 dev_uc_unsync(slave_dev, bond_dev);
758 dev_mc_unsync(slave_dev, bond_dev);
759
760 if (bond->params.mode == BOND_MODE_8023AD) {
761 /* del lacpdu mc addr from mc list */
762 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
763
764 dev_mc_del(slave_dev, lacpdu_multicast);
765 }
766 }
767
768 /*--------------------------- Active slave change ---------------------------*/
769
770 /* Update the hardware address list and promisc/allmulti for the new and
771 * old active slaves (if any). Modes that are !USES_PRIMARY keep all
772 * slaves up date at all times; only the USES_PRIMARY modes need to call
773 * this function to swap these settings during a failover.
774 */
775 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
776 struct slave *old_active)
777 {
778 if (old_active) {
779 if (bond->dev->flags & IFF_PROMISC)
780 dev_set_promiscuity(old_active->dev, -1);
781
782 if (bond->dev->flags & IFF_ALLMULTI)
783 dev_set_allmulti(old_active->dev, -1);
784
785 bond_hw_addr_flush(bond->dev, old_active->dev);
786 }
787
788 if (new_active) {
789 /* FIXME: Signal errors upstream. */
790 if (bond->dev->flags & IFF_PROMISC)
791 dev_set_promiscuity(new_active->dev, 1);
792
793 if (bond->dev->flags & IFF_ALLMULTI)
794 dev_set_allmulti(new_active->dev, 1);
795
796 netif_addr_lock_bh(bond->dev);
797 dev_uc_sync(new_active->dev, bond->dev);
798 dev_mc_sync(new_active->dev, bond->dev);
799 netif_addr_unlock_bh(bond->dev);
800 }
801 }
802
803 /**
804 * bond_set_dev_addr - clone slave's address to bond
805 * @bond_dev: bond net device
806 * @slave_dev: slave net device
807 *
808 * Should be called with RTNL held.
809 */
810 static void bond_set_dev_addr(struct net_device *bond_dev,
811 struct net_device *slave_dev)
812 {
813 pr_debug("bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
814 bond_dev, slave_dev, slave_dev->addr_len);
815 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
816 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
817 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
818 }
819
820 /*
821 * bond_do_fail_over_mac
822 *
823 * Perform special MAC address swapping for fail_over_mac settings
824 *
825 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
826 */
827 static void bond_do_fail_over_mac(struct bonding *bond,
828 struct slave *new_active,
829 struct slave *old_active)
830 __releases(&bond->curr_slave_lock)
831 __releases(&bond->lock)
832 __acquires(&bond->lock)
833 __acquires(&bond->curr_slave_lock)
834 {
835 u8 tmp_mac[ETH_ALEN];
836 struct sockaddr saddr;
837 int rv;
838
839 switch (bond->params.fail_over_mac) {
840 case BOND_FOM_ACTIVE:
841 if (new_active) {
842 write_unlock_bh(&bond->curr_slave_lock);
843 read_unlock(&bond->lock);
844 bond_set_dev_addr(bond->dev, new_active->dev);
845 read_lock(&bond->lock);
846 write_lock_bh(&bond->curr_slave_lock);
847 }
848 break;
849 case BOND_FOM_FOLLOW:
850 /*
851 * if new_active && old_active, swap them
852 * if just old_active, do nothing (going to no active slave)
853 * if just new_active, set new_active to bond's MAC
854 */
855 if (!new_active)
856 return;
857
858 write_unlock_bh(&bond->curr_slave_lock);
859 read_unlock(&bond->lock);
860
861 if (old_active) {
862 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
863 memcpy(saddr.sa_data, old_active->dev->dev_addr,
864 ETH_ALEN);
865 saddr.sa_family = new_active->dev->type;
866 } else {
867 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
868 saddr.sa_family = bond->dev->type;
869 }
870
871 rv = dev_set_mac_address(new_active->dev, &saddr);
872 if (rv) {
873 pr_err("%s: Error %d setting MAC of slave %s\n",
874 bond->dev->name, -rv, new_active->dev->name);
875 goto out;
876 }
877
878 if (!old_active)
879 goto out;
880
881 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
882 saddr.sa_family = old_active->dev->type;
883
884 rv = dev_set_mac_address(old_active->dev, &saddr);
885 if (rv)
886 pr_err("%s: Error %d setting MAC of slave %s\n",
887 bond->dev->name, -rv, new_active->dev->name);
888 out:
889 read_lock(&bond->lock);
890 write_lock_bh(&bond->curr_slave_lock);
891 break;
892 default:
893 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
894 bond->dev->name, bond->params.fail_over_mac);
895 break;
896 }
897
898 }
899
900 static bool bond_should_change_active(struct bonding *bond)
901 {
902 struct slave *prim = bond->primary_slave;
903 struct slave *curr = bond->curr_active_slave;
904
905 if (!prim || !curr || curr->link != BOND_LINK_UP)
906 return true;
907 if (bond->force_primary) {
908 bond->force_primary = false;
909 return true;
910 }
911 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
912 (prim->speed < curr->speed ||
913 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
914 return false;
915 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
916 return false;
917 return true;
918 }
919
920 /**
921 * find_best_interface - select the best available slave to be the active one
922 * @bond: our bonding struct
923 *
924 * Warning: Caller must hold curr_slave_lock for writing.
925 */
926 static struct slave *bond_find_best_slave(struct bonding *bond)
927 {
928 struct slave *new_active, *old_active;
929 struct slave *bestslave = NULL;
930 int mintime = bond->params.updelay;
931 int i;
932
933 new_active = bond->curr_active_slave;
934
935 if (!new_active) { /* there were no active slaves left */
936 new_active = bond_first_slave(bond);
937 if (!new_active)
938 return NULL; /* still no slave, return NULL */
939 }
940
941 if ((bond->primary_slave) &&
942 bond->primary_slave->link == BOND_LINK_UP &&
943 bond_should_change_active(bond)) {
944 new_active = bond->primary_slave;
945 }
946
947 /* remember where to stop iterating over the slaves */
948 old_active = new_active;
949
950 bond_for_each_slave_from(bond, new_active, i, old_active) {
951 if (new_active->link == BOND_LINK_UP) {
952 return new_active;
953 } else if (new_active->link == BOND_LINK_BACK &&
954 IS_UP(new_active->dev)) {
955 /* link up, but waiting for stabilization */
956 if (new_active->delay < mintime) {
957 mintime = new_active->delay;
958 bestslave = new_active;
959 }
960 }
961 }
962
963 return bestslave;
964 }
965
966 static bool bond_should_notify_peers(struct bonding *bond)
967 {
968 struct slave *slave = bond->curr_active_slave;
969
970 pr_debug("bond_should_notify_peers: bond %s slave %s\n",
971 bond->dev->name, slave ? slave->dev->name : "NULL");
972
973 if (!slave || !bond->send_peer_notif ||
974 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
975 return false;
976
977 bond->send_peer_notif--;
978 return true;
979 }
980
981 /**
982 * change_active_interface - change the active slave into the specified one
983 * @bond: our bonding struct
984 * @new: the new slave to make the active one
985 *
986 * Set the new slave to the bond's settings and unset them on the old
987 * curr_active_slave.
988 * Setting include flags, mc-list, promiscuity, allmulti, etc.
989 *
990 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
991 * because it is apparently the best available slave we have, even though its
992 * updelay hasn't timed out yet.
993 *
994 * If new_active is not NULL, caller must hold bond->lock for read and
995 * curr_slave_lock for write_bh.
996 */
997 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
998 {
999 struct slave *old_active = bond->curr_active_slave;
1000
1001 if (old_active == new_active)
1002 return;
1003
1004 if (new_active) {
1005 new_active->jiffies = jiffies;
1006
1007 if (new_active->link == BOND_LINK_BACK) {
1008 if (USES_PRIMARY(bond->params.mode)) {
1009 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1010 bond->dev->name, new_active->dev->name,
1011 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1012 }
1013
1014 new_active->delay = 0;
1015 new_active->link = BOND_LINK_UP;
1016
1017 if (bond->params.mode == BOND_MODE_8023AD)
1018 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1019
1020 if (bond_is_lb(bond))
1021 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1022 } else {
1023 if (USES_PRIMARY(bond->params.mode)) {
1024 pr_info("%s: making interface %s the new active one.\n",
1025 bond->dev->name, new_active->dev->name);
1026 }
1027 }
1028 }
1029
1030 if (USES_PRIMARY(bond->params.mode))
1031 bond_hw_addr_swap(bond, new_active, old_active);
1032
1033 if (bond_is_lb(bond)) {
1034 bond_alb_handle_active_change(bond, new_active);
1035 if (old_active)
1036 bond_set_slave_inactive_flags(old_active);
1037 if (new_active)
1038 bond_set_slave_active_flags(new_active);
1039 } else {
1040 bond->curr_active_slave = new_active;
1041 }
1042
1043 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1044 if (old_active)
1045 bond_set_slave_inactive_flags(old_active);
1046
1047 if (new_active) {
1048 bool should_notify_peers = false;
1049
1050 bond_set_slave_active_flags(new_active);
1051
1052 if (bond->params.fail_over_mac)
1053 bond_do_fail_over_mac(bond, new_active,
1054 old_active);
1055
1056 if (netif_running(bond->dev)) {
1057 bond->send_peer_notif =
1058 bond->params.num_peer_notif;
1059 should_notify_peers =
1060 bond_should_notify_peers(bond);
1061 }
1062
1063 write_unlock_bh(&bond->curr_slave_lock);
1064 read_unlock(&bond->lock);
1065
1066 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1067 if (should_notify_peers)
1068 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1069 bond->dev);
1070
1071 read_lock(&bond->lock);
1072 write_lock_bh(&bond->curr_slave_lock);
1073 }
1074 }
1075
1076 /* resend IGMP joins since active slave has changed or
1077 * all were sent on curr_active_slave.
1078 * resend only if bond is brought up with the affected
1079 * bonding modes and the retransmission is enabled */
1080 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1081 ((USES_PRIMARY(bond->params.mode) && new_active) ||
1082 bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1083 bond->igmp_retrans = bond->params.resend_igmp;
1084 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1085 }
1086 }
1087
1088 /**
1089 * bond_select_active_slave - select a new active slave, if needed
1090 * @bond: our bonding struct
1091 *
1092 * This functions should be called when one of the following occurs:
1093 * - The old curr_active_slave has been released or lost its link.
1094 * - The primary_slave has got its link back.
1095 * - A slave has got its link back and there's no old curr_active_slave.
1096 *
1097 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1098 */
1099 void bond_select_active_slave(struct bonding *bond)
1100 {
1101 struct slave *best_slave;
1102 int rv;
1103
1104 best_slave = bond_find_best_slave(bond);
1105 if (best_slave != bond->curr_active_slave) {
1106 bond_change_active_slave(bond, best_slave);
1107 rv = bond_set_carrier(bond);
1108 if (!rv)
1109 return;
1110
1111 if (netif_carrier_ok(bond->dev)) {
1112 pr_info("%s: first active interface up!\n",
1113 bond->dev->name);
1114 } else {
1115 pr_info("%s: now running without any active interface !\n",
1116 bond->dev->name);
1117 }
1118 }
1119 }
1120
1121 /*--------------------------- slave list handling ---------------------------*/
1122
1123 /*
1124 * This function attaches the slave to the end of list.
1125 *
1126 * bond->lock held for writing by caller.
1127 */
1128 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1129 {
1130 list_add_tail(&new_slave->list, &bond->slave_list);
1131 bond->slave_cnt++;
1132 }
1133
1134 /*
1135 * This function detaches the slave from the list.
1136 * WARNING: no check is made to verify if the slave effectively
1137 * belongs to <bond>.
1138 * Nothing is freed on return, structures are just unchained.
1139 * If any slave pointer in bond was pointing to <slave>,
1140 * it should be changed by the calling function.
1141 *
1142 * bond->lock held for writing by caller.
1143 */
1144 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1145 {
1146 list_del(&slave->list);
1147 bond->slave_cnt--;
1148 }
1149
1150 #ifdef CONFIG_NET_POLL_CONTROLLER
1151 static inline int slave_enable_netpoll(struct slave *slave)
1152 {
1153 struct netpoll *np;
1154 int err = 0;
1155
1156 np = kzalloc(sizeof(*np), GFP_ATOMIC);
1157 err = -ENOMEM;
1158 if (!np)
1159 goto out;
1160
1161 err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
1162 if (err) {
1163 kfree(np);
1164 goto out;
1165 }
1166 slave->np = np;
1167 out:
1168 return err;
1169 }
1170 static inline void slave_disable_netpoll(struct slave *slave)
1171 {
1172 struct netpoll *np = slave->np;
1173
1174 if (!np)
1175 return;
1176
1177 slave->np = NULL;
1178 __netpoll_free_async(np);
1179 }
1180 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1181 {
1182 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1183 return false;
1184 if (!slave_dev->netdev_ops->ndo_poll_controller)
1185 return false;
1186 return true;
1187 }
1188
1189 static void bond_poll_controller(struct net_device *bond_dev)
1190 {
1191 }
1192
1193 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1194 {
1195 struct bonding *bond = netdev_priv(bond_dev);
1196 struct slave *slave;
1197
1198 bond_for_each_slave(bond, slave)
1199 if (IS_UP(slave->dev))
1200 slave_disable_netpoll(slave);
1201 }
1202
1203 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
1204 {
1205 struct bonding *bond = netdev_priv(dev);
1206 struct slave *slave;
1207 int err = 0;
1208
1209 bond_for_each_slave(bond, slave) {
1210 err = slave_enable_netpoll(slave);
1211 if (err) {
1212 bond_netpoll_cleanup(dev);
1213 break;
1214 }
1215 }
1216 return err;
1217 }
1218 #else
1219 static inline int slave_enable_netpoll(struct slave *slave)
1220 {
1221 return 0;
1222 }
1223 static inline void slave_disable_netpoll(struct slave *slave)
1224 {
1225 }
1226 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1227 {
1228 }
1229 #endif
1230
1231 /*---------------------------------- IOCTL ----------------------------------*/
1232
1233 static netdev_features_t bond_fix_features(struct net_device *dev,
1234 netdev_features_t features)
1235 {
1236 struct slave *slave;
1237 struct bonding *bond = netdev_priv(dev);
1238 netdev_features_t mask;
1239
1240 read_lock(&bond->lock);
1241
1242 if (list_empty(&bond->slave_list)) {
1243 /* Disable adding VLANs to empty bond. But why? --mq */
1244 features |= NETIF_F_VLAN_CHALLENGED;
1245 goto out;
1246 }
1247
1248 mask = features;
1249 features &= ~NETIF_F_ONE_FOR_ALL;
1250 features |= NETIF_F_ALL_FOR_ALL;
1251
1252 bond_for_each_slave(bond, slave) {
1253 features = netdev_increment_features(features,
1254 slave->dev->features,
1255 mask);
1256 }
1257 features = netdev_add_tso_features(features, mask);
1258
1259 out:
1260 read_unlock(&bond->lock);
1261 return features;
1262 }
1263
1264 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1265 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1266 NETIF_F_HIGHDMA | NETIF_F_LRO)
1267
1268 static void bond_compute_features(struct bonding *bond)
1269 {
1270 struct slave *slave;
1271 struct net_device *bond_dev = bond->dev;
1272 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1273 unsigned short max_hard_header_len = ETH_HLEN;
1274 unsigned int gso_max_size = GSO_MAX_SIZE;
1275 u16 gso_max_segs = GSO_MAX_SEGS;
1276 unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1277
1278 read_lock(&bond->lock);
1279
1280 if (list_empty(&bond->slave_list))
1281 goto done;
1282
1283 bond_for_each_slave(bond, slave) {
1284 vlan_features = netdev_increment_features(vlan_features,
1285 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1286
1287 dst_release_flag &= slave->dev->priv_flags;
1288 if (slave->dev->hard_header_len > max_hard_header_len)
1289 max_hard_header_len = slave->dev->hard_header_len;
1290
1291 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1292 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1293 }
1294
1295 done:
1296 bond_dev->vlan_features = vlan_features;
1297 bond_dev->hard_header_len = max_hard_header_len;
1298 bond_dev->gso_max_segs = gso_max_segs;
1299 netif_set_gso_max_size(bond_dev, gso_max_size);
1300
1301 flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1302 bond_dev->priv_flags = flags | dst_release_flag;
1303
1304 read_unlock(&bond->lock);
1305
1306 netdev_change_features(bond_dev);
1307 }
1308
1309 static void bond_setup_by_slave(struct net_device *bond_dev,
1310 struct net_device *slave_dev)
1311 {
1312 bond_dev->header_ops = slave_dev->header_ops;
1313
1314 bond_dev->type = slave_dev->type;
1315 bond_dev->hard_header_len = slave_dev->hard_header_len;
1316 bond_dev->addr_len = slave_dev->addr_len;
1317
1318 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1319 slave_dev->addr_len);
1320 }
1321
1322 /* On bonding slaves other than the currently active slave, suppress
1323 * duplicates except for alb non-mcast/bcast.
1324 */
1325 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1326 struct slave *slave,
1327 struct bonding *bond)
1328 {
1329 if (bond_is_slave_inactive(slave)) {
1330 if (bond->params.mode == BOND_MODE_ALB &&
1331 skb->pkt_type != PACKET_BROADCAST &&
1332 skb->pkt_type != PACKET_MULTICAST)
1333 return false;
1334 return true;
1335 }
1336 return false;
1337 }
1338
1339 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1340 {
1341 struct sk_buff *skb = *pskb;
1342 struct slave *slave;
1343 struct bonding *bond;
1344 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1345 struct slave *);
1346 int ret = RX_HANDLER_ANOTHER;
1347
1348 skb = skb_share_check(skb, GFP_ATOMIC);
1349 if (unlikely(!skb))
1350 return RX_HANDLER_CONSUMED;
1351
1352 *pskb = skb;
1353
1354 slave = bond_slave_get_rcu(skb->dev);
1355 bond = slave->bond;
1356
1357 if (bond->params.arp_interval)
1358 slave->dev->last_rx = jiffies;
1359
1360 recv_probe = ACCESS_ONCE(bond->recv_probe);
1361 if (recv_probe) {
1362 ret = recv_probe(skb, bond, slave);
1363 if (ret == RX_HANDLER_CONSUMED) {
1364 consume_skb(skb);
1365 return ret;
1366 }
1367 }
1368
1369 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1370 return RX_HANDLER_EXACT;
1371 }
1372
1373 skb->dev = bond->dev;
1374
1375 if (bond->params.mode == BOND_MODE_ALB &&
1376 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1377 skb->pkt_type == PACKET_HOST) {
1378
1379 if (unlikely(skb_cow_head(skb,
1380 skb->data - skb_mac_header(skb)))) {
1381 kfree_skb(skb);
1382 return RX_HANDLER_CONSUMED;
1383 }
1384 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1385 }
1386
1387 return ret;
1388 }
1389
1390 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1391 struct net_device *slave_dev)
1392 {
1393 int err;
1394
1395 err = netdev_master_upper_dev_link(slave_dev, bond_dev);
1396 if (err)
1397 return err;
1398 slave_dev->flags |= IFF_SLAVE;
1399 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1400 return 0;
1401 }
1402
1403 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1404 struct net_device *slave_dev)
1405 {
1406 netdev_upper_dev_unlink(slave_dev, bond_dev);
1407 slave_dev->flags &= ~IFF_SLAVE;
1408 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1409 }
1410
1411 /* enslave device <slave> to bond device <master> */
1412 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1413 {
1414 struct bonding *bond = netdev_priv(bond_dev);
1415 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1416 struct slave *new_slave = NULL;
1417 struct sockaddr addr;
1418 int link_reporting;
1419 int res = 0, i;
1420
1421 if (!bond->params.use_carrier &&
1422 slave_dev->ethtool_ops->get_link == NULL &&
1423 slave_ops->ndo_do_ioctl == NULL) {
1424 pr_warning("%s: Warning: no link monitoring support for %s\n",
1425 bond_dev->name, slave_dev->name);
1426 }
1427
1428 /* already enslaved */
1429 if (slave_dev->flags & IFF_SLAVE) {
1430 pr_debug("Error, Device was already enslaved\n");
1431 return -EBUSY;
1432 }
1433
1434 /* vlan challenged mutual exclusion */
1435 /* no need to lock since we're protected by rtnl_lock */
1436 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1437 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1438 if (vlan_uses_dev(bond_dev)) {
1439 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1440 bond_dev->name, slave_dev->name, bond_dev->name);
1441 return -EPERM;
1442 } else {
1443 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1444 bond_dev->name, slave_dev->name,
1445 slave_dev->name, bond_dev->name);
1446 }
1447 } else {
1448 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1449 }
1450
1451 /*
1452 * Old ifenslave binaries are no longer supported. These can
1453 * be identified with moderate accuracy by the state of the slave:
1454 * the current ifenslave will set the interface down prior to
1455 * enslaving it; the old ifenslave will not.
1456 */
1457 if ((slave_dev->flags & IFF_UP)) {
1458 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1459 slave_dev->name);
1460 res = -EPERM;
1461 goto err_undo_flags;
1462 }
1463
1464 /* set bonding device ether type by slave - bonding netdevices are
1465 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1466 * there is a need to override some of the type dependent attribs/funcs.
1467 *
1468 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1469 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1470 */
1471 if (list_empty(&bond->slave_list)) {
1472 if (bond_dev->type != slave_dev->type) {
1473 pr_debug("%s: change device type from %d to %d\n",
1474 bond_dev->name,
1475 bond_dev->type, slave_dev->type);
1476
1477 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1478 bond_dev);
1479 res = notifier_to_errno(res);
1480 if (res) {
1481 pr_err("%s: refused to change device type\n",
1482 bond_dev->name);
1483 res = -EBUSY;
1484 goto err_undo_flags;
1485 }
1486
1487 /* Flush unicast and multicast addresses */
1488 dev_uc_flush(bond_dev);
1489 dev_mc_flush(bond_dev);
1490
1491 if (slave_dev->type != ARPHRD_ETHER)
1492 bond_setup_by_slave(bond_dev, slave_dev);
1493 else {
1494 ether_setup(bond_dev);
1495 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1496 }
1497
1498 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1499 bond_dev);
1500 }
1501 } else if (bond_dev->type != slave_dev->type) {
1502 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1503 slave_dev->name,
1504 slave_dev->type, bond_dev->type);
1505 res = -EINVAL;
1506 goto err_undo_flags;
1507 }
1508
1509 if (slave_ops->ndo_set_mac_address == NULL) {
1510 if (list_empty(&bond->slave_list)) {
1511 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1512 bond_dev->name);
1513 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1514 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1515 pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active.\n",
1516 bond_dev->name);
1517 res = -EOPNOTSUPP;
1518 goto err_undo_flags;
1519 }
1520 }
1521
1522 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1523
1524 /* If this is the first slave, then we need to set the master's hardware
1525 * address to be the same as the slave's. */
1526 if (list_empty(&bond->slave_list) &&
1527 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1528 bond_set_dev_addr(bond->dev, slave_dev);
1529
1530 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1531 if (!new_slave) {
1532 res = -ENOMEM;
1533 goto err_undo_flags;
1534 }
1535 INIT_LIST_HEAD(&new_slave->list);
1536 /*
1537 * Set the new_slave's queue_id to be zero. Queue ID mapping
1538 * is set via sysfs or module option if desired.
1539 */
1540 new_slave->queue_id = 0;
1541
1542 /* Save slave's original mtu and then set it to match the bond */
1543 new_slave->original_mtu = slave_dev->mtu;
1544 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1545 if (res) {
1546 pr_debug("Error %d calling dev_set_mtu\n", res);
1547 goto err_free;
1548 }
1549
1550 /*
1551 * Save slave's original ("permanent") mac address for modes
1552 * that need it, and for restoring it upon release, and then
1553 * set it to the master's address
1554 */
1555 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1556
1557 if (!bond->params.fail_over_mac) {
1558 /*
1559 * Set slave to master's mac address. The application already
1560 * set the master's mac address to that of the first slave
1561 */
1562 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1563 addr.sa_family = slave_dev->type;
1564 res = dev_set_mac_address(slave_dev, &addr);
1565 if (res) {
1566 pr_debug("Error %d calling set_mac_address\n", res);
1567 goto err_restore_mtu;
1568 }
1569 }
1570
1571 res = bond_master_upper_dev_link(bond_dev, slave_dev);
1572 if (res) {
1573 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1574 goto err_restore_mac;
1575 }
1576
1577 /* open the slave since the application closed it */
1578 res = dev_open(slave_dev);
1579 if (res) {
1580 pr_debug("Opening slave %s failed\n", slave_dev->name);
1581 goto err_unset_master;
1582 }
1583
1584 new_slave->bond = bond;
1585 new_slave->dev = slave_dev;
1586 slave_dev->priv_flags |= IFF_BONDING;
1587
1588 if (bond_is_lb(bond)) {
1589 /* bond_alb_init_slave() must be called before all other stages since
1590 * it might fail and we do not want to have to undo everything
1591 */
1592 res = bond_alb_init_slave(bond, new_slave);
1593 if (res)
1594 goto err_close;
1595 }
1596
1597 /* If the mode USES_PRIMARY, then the following is handled by
1598 * bond_change_active_slave().
1599 */
1600 if (!USES_PRIMARY(bond->params.mode)) {
1601 /* set promiscuity level to new slave */
1602 if (bond_dev->flags & IFF_PROMISC) {
1603 res = dev_set_promiscuity(slave_dev, 1);
1604 if (res)
1605 goto err_close;
1606 }
1607
1608 /* set allmulti level to new slave */
1609 if (bond_dev->flags & IFF_ALLMULTI) {
1610 res = dev_set_allmulti(slave_dev, 1);
1611 if (res)
1612 goto err_close;
1613 }
1614
1615 netif_addr_lock_bh(bond_dev);
1616
1617 dev_mc_sync_multiple(slave_dev, bond_dev);
1618 dev_uc_sync_multiple(slave_dev, bond_dev);
1619
1620 netif_addr_unlock_bh(bond_dev);
1621 }
1622
1623 if (bond->params.mode == BOND_MODE_8023AD) {
1624 /* add lacpdu mc addr to mc list */
1625 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1626
1627 dev_mc_add(slave_dev, lacpdu_multicast);
1628 }
1629
1630 bond_add_vlans_on_slave(bond, slave_dev);
1631
1632 write_lock_bh(&bond->lock);
1633
1634 bond_attach_slave(bond, new_slave);
1635
1636 new_slave->delay = 0;
1637 new_slave->link_failure_count = 0;
1638
1639 write_unlock_bh(&bond->lock);
1640
1641 bond_compute_features(bond);
1642
1643 bond_update_speed_duplex(new_slave);
1644
1645 read_lock(&bond->lock);
1646
1647 new_slave->last_arp_rx = jiffies -
1648 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1649 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1650 new_slave->target_last_arp_rx[i] = new_slave->last_arp_rx;
1651
1652 if (bond->params.miimon && !bond->params.use_carrier) {
1653 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1654
1655 if ((link_reporting == -1) && !bond->params.arp_interval) {
1656 /*
1657 * miimon is set but a bonded network driver
1658 * does not support ETHTOOL/MII and
1659 * arp_interval is not set. Note: if
1660 * use_carrier is enabled, we will never go
1661 * here (because netif_carrier is always
1662 * supported); thus, we don't need to change
1663 * the messages for netif_carrier.
1664 */
1665 pr_warning("%s: Warning: 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",
1666 bond_dev->name, slave_dev->name);
1667 } else if (link_reporting == -1) {
1668 /* unable get link status using mii/ethtool */
1669 pr_warning("%s: Warning: 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",
1670 bond_dev->name, slave_dev->name);
1671 }
1672 }
1673
1674 /* check for initial state */
1675 if (bond->params.miimon) {
1676 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1677 if (bond->params.updelay) {
1678 new_slave->link = BOND_LINK_BACK;
1679 new_slave->delay = bond->params.updelay;
1680 } else {
1681 new_slave->link = BOND_LINK_UP;
1682 }
1683 } else {
1684 new_slave->link = BOND_LINK_DOWN;
1685 }
1686 } else if (bond->params.arp_interval) {
1687 new_slave->link = (netif_carrier_ok(slave_dev) ?
1688 BOND_LINK_UP : BOND_LINK_DOWN);
1689 } else {
1690 new_slave->link = BOND_LINK_UP;
1691 }
1692
1693 if (new_slave->link != BOND_LINK_DOWN)
1694 new_slave->jiffies = jiffies;
1695 pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1696 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1697 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1698
1699 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1700 /* if there is a primary slave, remember it */
1701 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1702 bond->primary_slave = new_slave;
1703 bond->force_primary = true;
1704 }
1705 }
1706
1707 write_lock_bh(&bond->curr_slave_lock);
1708
1709 switch (bond->params.mode) {
1710 case BOND_MODE_ACTIVEBACKUP:
1711 bond_set_slave_inactive_flags(new_slave);
1712 bond_select_active_slave(bond);
1713 break;
1714 case BOND_MODE_8023AD:
1715 /* in 802.3ad mode, the internal mechanism
1716 * will activate the slaves in the selected
1717 * aggregator
1718 */
1719 bond_set_slave_inactive_flags(new_slave);
1720 /* if this is the first slave */
1721 if (bond_first_slave(bond) == new_slave) {
1722 SLAVE_AD_INFO(new_slave).id = 1;
1723 /* Initialize AD with the number of times that the AD timer is called in 1 second
1724 * can be called only after the mac address of the bond is set
1725 */
1726 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1727 } else {
1728 struct slave *prev_slave;
1729
1730 prev_slave = bond_prev_slave(bond, new_slave);
1731 SLAVE_AD_INFO(new_slave).id =
1732 SLAVE_AD_INFO(prev_slave).id + 1;
1733 }
1734
1735 bond_3ad_bind_slave(new_slave);
1736 break;
1737 case BOND_MODE_TLB:
1738 case BOND_MODE_ALB:
1739 bond_set_active_slave(new_slave);
1740 bond_set_slave_inactive_flags(new_slave);
1741 bond_select_active_slave(bond);
1742 break;
1743 default:
1744 pr_debug("This slave is always active in trunk mode\n");
1745
1746 /* always active in trunk mode */
1747 bond_set_active_slave(new_slave);
1748
1749 /* In trunking mode there is little meaning to curr_active_slave
1750 * anyway (it holds no special properties of the bond device),
1751 * so we can change it without calling change_active_interface()
1752 */
1753 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1754 bond->curr_active_slave = new_slave;
1755
1756 break;
1757 } /* switch(bond_mode) */
1758
1759 write_unlock_bh(&bond->curr_slave_lock);
1760
1761 bond_set_carrier(bond);
1762
1763 #ifdef CONFIG_NET_POLL_CONTROLLER
1764 slave_dev->npinfo = bond->dev->npinfo;
1765 if (slave_dev->npinfo) {
1766 if (slave_enable_netpoll(new_slave)) {
1767 read_unlock(&bond->lock);
1768 pr_info("Error, %s: master_dev is using netpoll, "
1769 "but new slave device does not support netpoll.\n",
1770 bond_dev->name);
1771 res = -EBUSY;
1772 goto err_detach;
1773 }
1774 }
1775 #endif
1776
1777 read_unlock(&bond->lock);
1778
1779 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1780 if (res)
1781 goto err_detach;
1782
1783 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1784 new_slave);
1785 if (res) {
1786 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1787 goto err_dest_symlinks;
1788 }
1789
1790 pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1791 bond_dev->name, slave_dev->name,
1792 bond_is_active_slave(new_slave) ? "n active" : " backup",
1793 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1794
1795 /* enslave is successful */
1796 return 0;
1797
1798 /* Undo stages on error */
1799 err_dest_symlinks:
1800 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1801
1802 err_detach:
1803 if (!USES_PRIMARY(bond->params.mode))
1804 bond_hw_addr_flush(bond_dev, slave_dev);
1805
1806 bond_del_vlans_from_slave(bond, slave_dev);
1807 write_lock_bh(&bond->lock);
1808 bond_detach_slave(bond, new_slave);
1809 if (bond->primary_slave == new_slave)
1810 bond->primary_slave = NULL;
1811 if (bond->curr_active_slave == new_slave) {
1812 bond_change_active_slave(bond, NULL);
1813 write_unlock_bh(&bond->lock);
1814 read_lock(&bond->lock);
1815 write_lock_bh(&bond->curr_slave_lock);
1816 bond_select_active_slave(bond);
1817 write_unlock_bh(&bond->curr_slave_lock);
1818 read_unlock(&bond->lock);
1819 } else {
1820 write_unlock_bh(&bond->lock);
1821 }
1822 slave_disable_netpoll(new_slave);
1823
1824 err_close:
1825 slave_dev->priv_flags &= ~IFF_BONDING;
1826 dev_close(slave_dev);
1827
1828 err_unset_master:
1829 bond_upper_dev_unlink(bond_dev, slave_dev);
1830
1831 err_restore_mac:
1832 if (!bond->params.fail_over_mac) {
1833 /* XXX TODO - fom follow mode needs to change master's
1834 * MAC if this slave's MAC is in use by the bond, or at
1835 * least print a warning.
1836 */
1837 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1838 addr.sa_family = slave_dev->type;
1839 dev_set_mac_address(slave_dev, &addr);
1840 }
1841
1842 err_restore_mtu:
1843 dev_set_mtu(slave_dev, new_slave->original_mtu);
1844
1845 err_free:
1846 kfree(new_slave);
1847
1848 err_undo_flags:
1849 bond_compute_features(bond);
1850 /* Enslave of first slave has failed and we need to fix master's mac */
1851 if (list_empty(&bond->slave_list) &&
1852 ether_addr_equal(bond_dev->dev_addr, slave_dev->dev_addr))
1853 eth_hw_addr_random(bond_dev);
1854
1855 return res;
1856 }
1857
1858 /*
1859 * Try to release the slave device <slave> from the bond device <master>
1860 * It is legal to access curr_active_slave without a lock because all the function
1861 * is write-locked. If "all" is true it means that the function is being called
1862 * while destroying a bond interface and all slaves are being released.
1863 *
1864 * The rules for slave state should be:
1865 * for Active/Backup:
1866 * Active stays on all backups go down
1867 * for Bonded connections:
1868 * The first up interface should be left on and all others downed.
1869 */
1870 static int __bond_release_one(struct net_device *bond_dev,
1871 struct net_device *slave_dev,
1872 bool all)
1873 {
1874 struct bonding *bond = netdev_priv(bond_dev);
1875 struct slave *slave, *oldcurrent;
1876 struct sockaddr addr;
1877 netdev_features_t old_features = bond_dev->features;
1878
1879 /* slave is not a slave or master is not master of this slave */
1880 if (!(slave_dev->flags & IFF_SLAVE) ||
1881 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1882 pr_err("%s: Error: cannot release %s.\n",
1883 bond_dev->name, slave_dev->name);
1884 return -EINVAL;
1885 }
1886
1887 block_netpoll_tx();
1888 write_lock_bh(&bond->lock);
1889
1890 slave = bond_get_slave_by_dev(bond, slave_dev);
1891 if (!slave) {
1892 /* not a slave of this bond */
1893 pr_info("%s: %s not enslaved\n",
1894 bond_dev->name, slave_dev->name);
1895 write_unlock_bh(&bond->lock);
1896 unblock_netpoll_tx();
1897 return -EINVAL;
1898 }
1899
1900 write_unlock_bh(&bond->lock);
1901 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1902 * for this slave anymore.
1903 */
1904 netdev_rx_handler_unregister(slave_dev);
1905 write_lock_bh(&bond->lock);
1906
1907 /* Inform AD package of unbinding of slave. */
1908 if (bond->params.mode == BOND_MODE_8023AD) {
1909 /* must be called before the slave is
1910 * detached from the list
1911 */
1912 bond_3ad_unbind_slave(slave);
1913 }
1914
1915 pr_info("%s: releasing %s interface %s\n",
1916 bond_dev->name,
1917 bond_is_active_slave(slave) ? "active" : "backup",
1918 slave_dev->name);
1919
1920 oldcurrent = bond->curr_active_slave;
1921
1922 bond->current_arp_slave = NULL;
1923
1924 /* release the slave from its bond */
1925 bond_detach_slave(bond, slave);
1926
1927 if (!all && !bond->params.fail_over_mac) {
1928 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
1929 !list_empty(&bond->slave_list))
1930 pr_warn("%s: Warning: 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",
1931 bond_dev->name, slave_dev->name,
1932 slave->perm_hwaddr,
1933 bond_dev->name, slave_dev->name);
1934 }
1935
1936 if (bond->primary_slave == slave)
1937 bond->primary_slave = NULL;
1938
1939 if (oldcurrent == slave)
1940 bond_change_active_slave(bond, NULL);
1941
1942 if (bond_is_lb(bond)) {
1943 /* Must be called only after the slave has been
1944 * detached from the list and the curr_active_slave
1945 * has been cleared (if our_slave == old_current),
1946 * but before a new active slave is selected.
1947 */
1948 write_unlock_bh(&bond->lock);
1949 bond_alb_deinit_slave(bond, slave);
1950 write_lock_bh(&bond->lock);
1951 }
1952
1953 if (all) {
1954 bond->curr_active_slave = NULL;
1955 } else if (oldcurrent == slave) {
1956 /*
1957 * Note that we hold RTNL over this sequence, so there
1958 * is no concern that another slave add/remove event
1959 * will interfere.
1960 */
1961 write_unlock_bh(&bond->lock);
1962 read_lock(&bond->lock);
1963 write_lock_bh(&bond->curr_slave_lock);
1964
1965 bond_select_active_slave(bond);
1966
1967 write_unlock_bh(&bond->curr_slave_lock);
1968 read_unlock(&bond->lock);
1969 write_lock_bh(&bond->lock);
1970 }
1971
1972 if (list_empty(&bond->slave_list)) {
1973 bond_set_carrier(bond);
1974 eth_hw_addr_random(bond_dev);
1975
1976 if (bond_vlan_used(bond)) {
1977 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1978 bond_dev->name, bond_dev->name);
1979 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1980 bond_dev->name);
1981 }
1982 }
1983
1984 write_unlock_bh(&bond->lock);
1985 unblock_netpoll_tx();
1986
1987 if (list_empty(&bond->slave_list)) {
1988 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1989 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1990 }
1991
1992 bond_compute_features(bond);
1993 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1994 (old_features & NETIF_F_VLAN_CHALLENGED))
1995 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1996 bond_dev->name, slave_dev->name, bond_dev->name);
1997
1998 /* must do this from outside any spinlocks */
1999 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2000
2001 bond_del_vlans_from_slave(bond, slave_dev);
2002
2003 /* If the mode USES_PRIMARY, then this cases was handled above by
2004 * bond_change_active_slave(..., NULL)
2005 */
2006 if (!USES_PRIMARY(bond->params.mode)) {
2007 /* unset promiscuity level from slave */
2008 if (bond_dev->flags & IFF_PROMISC)
2009 dev_set_promiscuity(slave_dev, -1);
2010
2011 /* unset allmulti level from slave */
2012 if (bond_dev->flags & IFF_ALLMULTI)
2013 dev_set_allmulti(slave_dev, -1);
2014
2015 bond_hw_addr_flush(bond_dev, slave_dev);
2016 }
2017
2018 bond_upper_dev_unlink(bond_dev, slave_dev);
2019
2020 slave_disable_netpoll(slave);
2021
2022 /* close slave before restoring its mac address */
2023 dev_close(slave_dev);
2024
2025 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2026 /* restore original ("permanent") mac address */
2027 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2028 addr.sa_family = slave_dev->type;
2029 dev_set_mac_address(slave_dev, &addr);
2030 }
2031
2032 dev_set_mtu(slave_dev, slave->original_mtu);
2033
2034 slave_dev->priv_flags &= ~IFF_BONDING;
2035
2036 kfree(slave);
2037
2038 return 0; /* deletion OK */
2039 }
2040
2041 /* A wrapper used because of ndo_del_link */
2042 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2043 {
2044 return __bond_release_one(bond_dev, slave_dev, false);
2045 }
2046
2047 /*
2048 * First release a slave and then destroy the bond if no more slaves are left.
2049 * Must be under rtnl_lock when this function is called.
2050 */
2051 static int bond_release_and_destroy(struct net_device *bond_dev,
2052 struct net_device *slave_dev)
2053 {
2054 struct bonding *bond = netdev_priv(bond_dev);
2055 int ret;
2056
2057 ret = bond_release(bond_dev, slave_dev);
2058 if (ret == 0 && list_empty(&bond->slave_list)) {
2059 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2060 pr_info("%s: destroying bond %s.\n",
2061 bond_dev->name, bond_dev->name);
2062 unregister_netdevice(bond_dev);
2063 }
2064 return ret;
2065 }
2066
2067 /*
2068 * This function changes the active slave to slave <slave_dev>.
2069 * It returns -EINVAL in the following cases.
2070 * - <slave_dev> is not found in the list.
2071 * - There is not active slave now.
2072 * - <slave_dev> is already active.
2073 * - The link state of <slave_dev> is not BOND_LINK_UP.
2074 * - <slave_dev> is not running.
2075 * In these cases, this function does nothing.
2076 * In the other cases, current_slave pointer is changed and 0 is returned.
2077 */
2078 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2079 {
2080 struct bonding *bond = netdev_priv(bond_dev);
2081 struct slave *old_active = NULL;
2082 struct slave *new_active = NULL;
2083 int res = 0;
2084
2085 if (!USES_PRIMARY(bond->params.mode))
2086 return -EINVAL;
2087
2088 /* Verify that bond_dev is indeed the master of slave_dev */
2089 if (!(slave_dev->flags & IFF_SLAVE) ||
2090 !netdev_has_upper_dev(slave_dev, bond_dev))
2091 return -EINVAL;
2092
2093 read_lock(&bond->lock);
2094
2095 old_active = bond->curr_active_slave;
2096 new_active = bond_get_slave_by_dev(bond, slave_dev);
2097 /*
2098 * Changing to the current active: do nothing; return success.
2099 */
2100 if (new_active && new_active == old_active) {
2101 read_unlock(&bond->lock);
2102 return 0;
2103 }
2104
2105 if (new_active &&
2106 old_active &&
2107 new_active->link == BOND_LINK_UP &&
2108 IS_UP(new_active->dev)) {
2109 block_netpoll_tx();
2110 write_lock_bh(&bond->curr_slave_lock);
2111 bond_change_active_slave(bond, new_active);
2112 write_unlock_bh(&bond->curr_slave_lock);
2113 unblock_netpoll_tx();
2114 } else
2115 res = -EINVAL;
2116
2117 read_unlock(&bond->lock);
2118
2119 return res;
2120 }
2121
2122 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2123 {
2124 struct bonding *bond = netdev_priv(bond_dev);
2125
2126 info->bond_mode = bond->params.mode;
2127 info->miimon = bond->params.miimon;
2128
2129 read_lock(&bond->lock);
2130 info->num_slaves = bond->slave_cnt;
2131 read_unlock(&bond->lock);
2132
2133 return 0;
2134 }
2135
2136 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2137 {
2138 struct bonding *bond = netdev_priv(bond_dev);
2139 int i = 0, res = -ENODEV;
2140 struct slave *slave;
2141
2142 read_lock(&bond->lock);
2143 bond_for_each_slave(bond, slave) {
2144 if (i++ == (int)info->slave_id) {
2145 res = 0;
2146 strcpy(info->slave_name, slave->dev->name);
2147 info->link = slave->link;
2148 info->state = bond_slave_state(slave);
2149 info->link_failure_count = slave->link_failure_count;
2150 break;
2151 }
2152 }
2153 read_unlock(&bond->lock);
2154
2155 return res;
2156 }
2157
2158 /*-------------------------------- Monitoring -------------------------------*/
2159
2160
2161 static int bond_miimon_inspect(struct bonding *bond)
2162 {
2163 int link_state, commit = 0;
2164 struct slave *slave;
2165 bool ignore_updelay;
2166
2167 ignore_updelay = !bond->curr_active_slave ? true : false;
2168
2169 bond_for_each_slave(bond, slave) {
2170 slave->new_link = BOND_LINK_NOCHANGE;
2171
2172 link_state = bond_check_dev_link(bond, slave->dev, 0);
2173
2174 switch (slave->link) {
2175 case BOND_LINK_UP:
2176 if (link_state)
2177 continue;
2178
2179 slave->link = BOND_LINK_FAIL;
2180 slave->delay = bond->params.downdelay;
2181 if (slave->delay) {
2182 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2183 bond->dev->name,
2184 (bond->params.mode ==
2185 BOND_MODE_ACTIVEBACKUP) ?
2186 (bond_is_active_slave(slave) ?
2187 "active " : "backup ") : "",
2188 slave->dev->name,
2189 bond->params.downdelay * bond->params.miimon);
2190 }
2191 /*FALLTHRU*/
2192 case BOND_LINK_FAIL:
2193 if (link_state) {
2194 /*
2195 * recovered before downdelay expired
2196 */
2197 slave->link = BOND_LINK_UP;
2198 slave->jiffies = jiffies;
2199 pr_info("%s: link status up again after %d ms for interface %s.\n",
2200 bond->dev->name,
2201 (bond->params.downdelay - slave->delay) *
2202 bond->params.miimon,
2203 slave->dev->name);
2204 continue;
2205 }
2206
2207 if (slave->delay <= 0) {
2208 slave->new_link = BOND_LINK_DOWN;
2209 commit++;
2210 continue;
2211 }
2212
2213 slave->delay--;
2214 break;
2215
2216 case BOND_LINK_DOWN:
2217 if (!link_state)
2218 continue;
2219
2220 slave->link = BOND_LINK_BACK;
2221 slave->delay = bond->params.updelay;
2222
2223 if (slave->delay) {
2224 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2225 bond->dev->name, slave->dev->name,
2226 ignore_updelay ? 0 :
2227 bond->params.updelay *
2228 bond->params.miimon);
2229 }
2230 /*FALLTHRU*/
2231 case BOND_LINK_BACK:
2232 if (!link_state) {
2233 slave->link = BOND_LINK_DOWN;
2234 pr_info("%s: link status down again after %d ms for interface %s.\n",
2235 bond->dev->name,
2236 (bond->params.updelay - slave->delay) *
2237 bond->params.miimon,
2238 slave->dev->name);
2239
2240 continue;
2241 }
2242
2243 if (ignore_updelay)
2244 slave->delay = 0;
2245
2246 if (slave->delay <= 0) {
2247 slave->new_link = BOND_LINK_UP;
2248 commit++;
2249 ignore_updelay = false;
2250 continue;
2251 }
2252
2253 slave->delay--;
2254 break;
2255 }
2256 }
2257
2258 return commit;
2259 }
2260
2261 static void bond_miimon_commit(struct bonding *bond)
2262 {
2263 struct slave *slave;
2264
2265 bond_for_each_slave(bond, slave) {
2266 switch (slave->new_link) {
2267 case BOND_LINK_NOCHANGE:
2268 continue;
2269
2270 case BOND_LINK_UP:
2271 slave->link = BOND_LINK_UP;
2272 slave->jiffies = jiffies;
2273
2274 if (bond->params.mode == BOND_MODE_8023AD) {
2275 /* prevent it from being the active one */
2276 bond_set_backup_slave(slave);
2277 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2278 /* make it immediately active */
2279 bond_set_active_slave(slave);
2280 } else if (slave != bond->primary_slave) {
2281 /* prevent it from being the active one */
2282 bond_set_backup_slave(slave);
2283 }
2284
2285 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2286 bond->dev->name, slave->dev->name,
2287 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2288 slave->duplex ? "full" : "half");
2289
2290 /* notify ad that the link status has changed */
2291 if (bond->params.mode == BOND_MODE_8023AD)
2292 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2293
2294 if (bond_is_lb(bond))
2295 bond_alb_handle_link_change(bond, slave,
2296 BOND_LINK_UP);
2297
2298 if (!bond->curr_active_slave ||
2299 (slave == bond->primary_slave))
2300 goto do_failover;
2301
2302 continue;
2303
2304 case BOND_LINK_DOWN:
2305 if (slave->link_failure_count < UINT_MAX)
2306 slave->link_failure_count++;
2307
2308 slave->link = BOND_LINK_DOWN;
2309
2310 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2311 bond->params.mode == BOND_MODE_8023AD)
2312 bond_set_slave_inactive_flags(slave);
2313
2314 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2315 bond->dev->name, slave->dev->name);
2316
2317 if (bond->params.mode == BOND_MODE_8023AD)
2318 bond_3ad_handle_link_change(slave,
2319 BOND_LINK_DOWN);
2320
2321 if (bond_is_lb(bond))
2322 bond_alb_handle_link_change(bond, slave,
2323 BOND_LINK_DOWN);
2324
2325 if (slave == bond->curr_active_slave)
2326 goto do_failover;
2327
2328 continue;
2329
2330 default:
2331 pr_err("%s: invalid new link %d on slave %s\n",
2332 bond->dev->name, slave->new_link,
2333 slave->dev->name);
2334 slave->new_link = BOND_LINK_NOCHANGE;
2335
2336 continue;
2337 }
2338
2339 do_failover:
2340 ASSERT_RTNL();
2341 block_netpoll_tx();
2342 write_lock_bh(&bond->curr_slave_lock);
2343 bond_select_active_slave(bond);
2344 write_unlock_bh(&bond->curr_slave_lock);
2345 unblock_netpoll_tx();
2346 }
2347
2348 bond_set_carrier(bond);
2349 }
2350
2351 /*
2352 * bond_mii_monitor
2353 *
2354 * Really a wrapper that splits the mii monitor into two phases: an
2355 * inspection, then (if inspection indicates something needs to be done)
2356 * an acquisition of appropriate locks followed by a commit phase to
2357 * implement whatever link state changes are indicated.
2358 */
2359 void bond_mii_monitor(struct work_struct *work)
2360 {
2361 struct bonding *bond = container_of(work, struct bonding,
2362 mii_work.work);
2363 bool should_notify_peers = false;
2364 unsigned long delay;
2365
2366 read_lock(&bond->lock);
2367
2368 delay = msecs_to_jiffies(bond->params.miimon);
2369
2370 if (list_empty(&bond->slave_list))
2371 goto re_arm;
2372
2373 should_notify_peers = bond_should_notify_peers(bond);
2374
2375 if (bond_miimon_inspect(bond)) {
2376 read_unlock(&bond->lock);
2377
2378 /* Race avoidance with bond_close cancel of workqueue */
2379 if (!rtnl_trylock()) {
2380 read_lock(&bond->lock);
2381 delay = 1;
2382 should_notify_peers = false;
2383 goto re_arm;
2384 }
2385
2386 read_lock(&bond->lock);
2387
2388 bond_miimon_commit(bond);
2389
2390 read_unlock(&bond->lock);
2391 rtnl_unlock(); /* might sleep, hold no other locks */
2392 read_lock(&bond->lock);
2393 }
2394
2395 re_arm:
2396 if (bond->params.miimon)
2397 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2398
2399 read_unlock(&bond->lock);
2400
2401 if (should_notify_peers) {
2402 if (!rtnl_trylock()) {
2403 read_lock(&bond->lock);
2404 bond->send_peer_notif++;
2405 read_unlock(&bond->lock);
2406 return;
2407 }
2408 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2409 rtnl_unlock();
2410 }
2411 }
2412
2413 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2414 {
2415 struct vlan_entry *vlan;
2416 struct net_device *vlan_dev;
2417
2418 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2419 return 1;
2420
2421 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2422 rcu_read_lock();
2423 vlan_dev = __vlan_find_dev_deep(bond->dev, htons(ETH_P_8021Q),
2424 vlan->vlan_id);
2425 rcu_read_unlock();
2426 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip))
2427 return 1;
2428 }
2429
2430 return 0;
2431 }
2432
2433 /*
2434 * We go to the (large) trouble of VLAN tagging ARP frames because
2435 * switches in VLAN mode (especially if ports are configured as
2436 * "native" to a VLAN) might not pass non-tagged frames.
2437 */
2438 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2439 {
2440 struct sk_buff *skb;
2441
2442 pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op,
2443 slave_dev->name, &dest_ip, &src_ip, vlan_id);
2444
2445 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2446 NULL, slave_dev->dev_addr, NULL);
2447
2448 if (!skb) {
2449 pr_err("ARP packet allocation failed\n");
2450 return;
2451 }
2452 if (vlan_id) {
2453 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2454 if (!skb) {
2455 pr_err("failed to insert VLAN tag\n");
2456 return;
2457 }
2458 }
2459 arp_xmit(skb);
2460 }
2461
2462
2463 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2464 {
2465 int i, vlan_id;
2466 __be32 *targets = bond->params.arp_targets;
2467 struct vlan_entry *vlan;
2468 struct net_device *vlan_dev = NULL;
2469 struct rtable *rt;
2470
2471 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2472 __be32 addr;
2473 if (!targets[i])
2474 break;
2475 pr_debug("basa: target %pI4\n", &targets[i]);
2476 if (!bond_vlan_used(bond)) {
2477 pr_debug("basa: empty vlan: arp_send\n");
2478 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2479 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2480 addr, 0);
2481 continue;
2482 }
2483
2484 /*
2485 * If VLANs are configured, we do a route lookup to
2486 * determine which VLAN interface would be used, so we
2487 * can tag the ARP with the proper VLAN tag.
2488 */
2489 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2490 RTO_ONLINK, 0);
2491 if (IS_ERR(rt)) {
2492 if (net_ratelimit()) {
2493 pr_warning("%s: no route to arp_ip_target %pI4\n",
2494 bond->dev->name, &targets[i]);
2495 }
2496 continue;
2497 }
2498
2499 /*
2500 * This target is not on a VLAN
2501 */
2502 if (rt->dst.dev == bond->dev) {
2503 ip_rt_put(rt);
2504 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2505 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2506 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2507 addr, 0);
2508 continue;
2509 }
2510
2511 vlan_id = 0;
2512 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2513 rcu_read_lock();
2514 vlan_dev = __vlan_find_dev_deep(bond->dev,
2515 htons(ETH_P_8021Q),
2516 vlan->vlan_id);
2517 rcu_read_unlock();
2518 if (vlan_dev == rt->dst.dev) {
2519 vlan_id = vlan->vlan_id;
2520 pr_debug("basa: vlan match on %s %d\n",
2521 vlan_dev->name, vlan_id);
2522 break;
2523 }
2524 }
2525
2526 if (vlan_id && vlan_dev) {
2527 ip_rt_put(rt);
2528 addr = bond_confirm_addr(vlan_dev, targets[i], 0);
2529 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2530 addr, vlan_id);
2531 continue;
2532 }
2533
2534 if (net_ratelimit()) {
2535 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2536 bond->dev->name, &targets[i],
2537 rt->dst.dev ? rt->dst.dev->name : "NULL");
2538 }
2539 ip_rt_put(rt);
2540 }
2541 }
2542
2543 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2544 {
2545 int i;
2546
2547 if (!sip || !bond_has_this_ip(bond, tip)) {
2548 pr_debug("bva: sip %pI4 tip %pI4 not found\n", &sip, &tip);
2549 return;
2550 }
2551
2552 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2553 if (i == -1) {
2554 pr_debug("bva: sip %pI4 not found in targets\n", &sip);
2555 return;
2556 }
2557 slave->last_arp_rx = jiffies;
2558 slave->target_last_arp_rx[i] = jiffies;
2559 }
2560
2561 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2562 struct slave *slave)
2563 {
2564 struct arphdr *arp = (struct arphdr *)skb->data;
2565 unsigned char *arp_ptr;
2566 __be32 sip, tip;
2567 int alen;
2568
2569 if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2570 return RX_HANDLER_ANOTHER;
2571
2572 read_lock(&bond->lock);
2573
2574 if (!slave_do_arp_validate(bond, slave))
2575 goto out_unlock;
2576
2577 alen = arp_hdr_len(bond->dev);
2578
2579 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2580 bond->dev->name, skb->dev->name);
2581
2582 if (alen > skb_headlen(skb)) {
2583 arp = kmalloc(alen, GFP_ATOMIC);
2584 if (!arp)
2585 goto out_unlock;
2586 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2587 goto out_unlock;
2588 }
2589
2590 if (arp->ar_hln != bond->dev->addr_len ||
2591 skb->pkt_type == PACKET_OTHERHOST ||
2592 skb->pkt_type == PACKET_LOOPBACK ||
2593 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2594 arp->ar_pro != htons(ETH_P_IP) ||
2595 arp->ar_pln != 4)
2596 goto out_unlock;
2597
2598 arp_ptr = (unsigned char *)(arp + 1);
2599 arp_ptr += bond->dev->addr_len;
2600 memcpy(&sip, arp_ptr, 4);
2601 arp_ptr += 4 + bond->dev->addr_len;
2602 memcpy(&tip, arp_ptr, 4);
2603
2604 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2605 bond->dev->name, slave->dev->name, bond_slave_state(slave),
2606 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2607 &sip, &tip);
2608
2609 /*
2610 * Backup slaves won't see the ARP reply, but do come through
2611 * here for each ARP probe (so we swap the sip/tip to validate
2612 * the probe). In a "redundant switch, common router" type of
2613 * configuration, the ARP probe will (hopefully) travel from
2614 * the active, through one switch, the router, then the other
2615 * switch before reaching the backup.
2616 *
2617 * We 'trust' the arp requests if there is an active slave and
2618 * it received valid arp reply(s) after it became active. This
2619 * is done to avoid endless looping when we can't reach the
2620 * arp_ip_target and fool ourselves with our own arp requests.
2621 */
2622 if (bond_is_active_slave(slave))
2623 bond_validate_arp(bond, slave, sip, tip);
2624 else if (bond->curr_active_slave &&
2625 time_after(slave_last_rx(bond, bond->curr_active_slave),
2626 bond->curr_active_slave->jiffies))
2627 bond_validate_arp(bond, slave, tip, sip);
2628
2629 out_unlock:
2630 read_unlock(&bond->lock);
2631 if (arp != (struct arphdr *)skb->data)
2632 kfree(arp);
2633 return RX_HANDLER_ANOTHER;
2634 }
2635
2636 /*
2637 * this function is called regularly to monitor each slave's link
2638 * ensuring that traffic is being sent and received when arp monitoring
2639 * is used in load-balancing mode. if the adapter has been dormant, then an
2640 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2641 * arp monitoring in active backup mode.
2642 */
2643 void bond_loadbalance_arp_mon(struct work_struct *work)
2644 {
2645 struct bonding *bond = container_of(work, struct bonding,
2646 arp_work.work);
2647 struct slave *slave, *oldcurrent;
2648 int do_failover = 0;
2649 int delta_in_ticks, extra_ticks;
2650
2651 read_lock(&bond->lock);
2652
2653 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2654 extra_ticks = delta_in_ticks / 2;
2655
2656 if (list_empty(&bond->slave_list))
2657 goto re_arm;
2658
2659 oldcurrent = bond->curr_active_slave;
2660 /* see if any of the previous devices are up now (i.e. they have
2661 * xmt and rcv traffic). the curr_active_slave does not come into
2662 * the picture unless it is null. also, slave->jiffies is not needed
2663 * here because we send an arp on each slave and give a slave as
2664 * long as it needs to get the tx/rx within the delta.
2665 * TODO: what about up/down delay in arp mode? it wasn't here before
2666 * so it can wait
2667 */
2668 bond_for_each_slave(bond, slave) {
2669 unsigned long trans_start = dev_trans_start(slave->dev);
2670
2671 if (slave->link != BOND_LINK_UP) {
2672 if (time_in_range(jiffies,
2673 trans_start - delta_in_ticks,
2674 trans_start + delta_in_ticks + extra_ticks) &&
2675 time_in_range(jiffies,
2676 slave->dev->last_rx - delta_in_ticks,
2677 slave->dev->last_rx + delta_in_ticks + extra_ticks)) {
2678
2679 slave->link = BOND_LINK_UP;
2680 bond_set_active_slave(slave);
2681
2682 /* primary_slave has no meaning in round-robin
2683 * mode. the window of a slave being up and
2684 * curr_active_slave being null after enslaving
2685 * is closed.
2686 */
2687 if (!oldcurrent) {
2688 pr_info("%s: link status definitely up for interface %s, ",
2689 bond->dev->name,
2690 slave->dev->name);
2691 do_failover = 1;
2692 } else {
2693 pr_info("%s: interface %s is now up\n",
2694 bond->dev->name,
2695 slave->dev->name);
2696 }
2697 }
2698 } else {
2699 /* slave->link == BOND_LINK_UP */
2700
2701 /* not all switches will respond to an arp request
2702 * when the source ip is 0, so don't take the link down
2703 * if we don't know our ip yet
2704 */
2705 if (!time_in_range(jiffies,
2706 trans_start - delta_in_ticks,
2707 trans_start + 2 * delta_in_ticks + extra_ticks) ||
2708 !time_in_range(jiffies,
2709 slave->dev->last_rx - delta_in_ticks,
2710 slave->dev->last_rx + 2 * delta_in_ticks + extra_ticks)) {
2711
2712 slave->link = BOND_LINK_DOWN;
2713 bond_set_backup_slave(slave);
2714
2715 if (slave->link_failure_count < UINT_MAX)
2716 slave->link_failure_count++;
2717
2718 pr_info("%s: interface %s is now down.\n",
2719 bond->dev->name,
2720 slave->dev->name);
2721
2722 if (slave == oldcurrent)
2723 do_failover = 1;
2724 }
2725 }
2726
2727 /* note: if switch is in round-robin mode, all links
2728 * must tx arp to ensure all links rx an arp - otherwise
2729 * links may oscillate or not come up at all; if switch is
2730 * in something like xor mode, there is nothing we can
2731 * do - all replies will be rx'ed on same link causing slaves
2732 * to be unstable during low/no traffic periods
2733 */
2734 if (IS_UP(slave->dev))
2735 bond_arp_send_all(bond, slave);
2736 }
2737
2738 if (do_failover) {
2739 block_netpoll_tx();
2740 write_lock_bh(&bond->curr_slave_lock);
2741
2742 bond_select_active_slave(bond);
2743
2744 write_unlock_bh(&bond->curr_slave_lock);
2745 unblock_netpoll_tx();
2746 }
2747
2748 re_arm:
2749 if (bond->params.arp_interval)
2750 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2751
2752 read_unlock(&bond->lock);
2753 }
2754
2755 /*
2756 * Called to inspect slaves for active-backup mode ARP monitor link state
2757 * changes. Sets new_link in slaves to specify what action should take
2758 * place for the slave. Returns 0 if no changes are found, >0 if changes
2759 * to link states must be committed.
2760 *
2761 * Called with bond->lock held for read.
2762 */
2763 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2764 {
2765 unsigned long trans_start;
2766 struct slave *slave;
2767 int extra_ticks;
2768 int commit = 0;
2769
2770 /* All the time comparisons below need some extra time. Otherwise, on
2771 * fast networks the ARP probe/reply may arrive within the same jiffy
2772 * as it was sent. Then, the next time the ARP monitor is run, one
2773 * arp_interval will already have passed in the comparisons.
2774 */
2775 extra_ticks = delta_in_ticks / 2;
2776
2777 bond_for_each_slave(bond, slave) {
2778 slave->new_link = BOND_LINK_NOCHANGE;
2779
2780 if (slave->link != BOND_LINK_UP) {
2781 if (time_in_range(jiffies,
2782 slave_last_rx(bond, slave) - delta_in_ticks,
2783 slave_last_rx(bond, slave) + delta_in_ticks + extra_ticks)) {
2784
2785 slave->new_link = BOND_LINK_UP;
2786 commit++;
2787 }
2788
2789 continue;
2790 }
2791
2792 /*
2793 * Give slaves 2*delta after being enslaved or made
2794 * active. This avoids bouncing, as the last receive
2795 * times need a full ARP monitor cycle to be updated.
2796 */
2797 if (time_in_range(jiffies,
2798 slave->jiffies - delta_in_ticks,
2799 slave->jiffies + 2 * delta_in_ticks + extra_ticks))
2800 continue;
2801
2802 /*
2803 * Backup slave is down if:
2804 * - No current_arp_slave AND
2805 * - more than 3*delta since last receive AND
2806 * - the bond has an IP address
2807 *
2808 * Note: a non-null current_arp_slave indicates
2809 * the curr_active_slave went down and we are
2810 * searching for a new one; under this condition
2811 * we only take the curr_active_slave down - this
2812 * gives each slave a chance to tx/rx traffic
2813 * before being taken out
2814 */
2815 if (!bond_is_active_slave(slave) &&
2816 !bond->current_arp_slave &&
2817 !time_in_range(jiffies,
2818 slave_last_rx(bond, slave) - delta_in_ticks,
2819 slave_last_rx(bond, slave) + 3 * delta_in_ticks + extra_ticks)) {
2820
2821 slave->new_link = BOND_LINK_DOWN;
2822 commit++;
2823 }
2824
2825 /*
2826 * Active slave is down if:
2827 * - more than 2*delta since transmitting OR
2828 * - (more than 2*delta since receive AND
2829 * the bond has an IP address)
2830 */
2831 trans_start = dev_trans_start(slave->dev);
2832 if (bond_is_active_slave(slave) &&
2833 (!time_in_range(jiffies,
2834 trans_start - delta_in_ticks,
2835 trans_start + 2 * delta_in_ticks + extra_ticks) ||
2836 !time_in_range(jiffies,
2837 slave_last_rx(bond, slave) - delta_in_ticks,
2838 slave_last_rx(bond, slave) + 2 * delta_in_ticks + extra_ticks))) {
2839
2840 slave->new_link = BOND_LINK_DOWN;
2841 commit++;
2842 }
2843 }
2844
2845 return commit;
2846 }
2847
2848 /*
2849 * Called to commit link state changes noted by inspection step of
2850 * active-backup mode ARP monitor.
2851 *
2852 * Called with RTNL and bond->lock for read.
2853 */
2854 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2855 {
2856 unsigned long trans_start;
2857 struct slave *slave;
2858
2859 bond_for_each_slave(bond, slave) {
2860 switch (slave->new_link) {
2861 case BOND_LINK_NOCHANGE:
2862 continue;
2863
2864 case BOND_LINK_UP:
2865 trans_start = dev_trans_start(slave->dev);
2866 if ((!bond->curr_active_slave &&
2867 time_in_range(jiffies,
2868 trans_start - delta_in_ticks,
2869 trans_start + delta_in_ticks + delta_in_ticks / 2)) ||
2870 bond->curr_active_slave != slave) {
2871 slave->link = BOND_LINK_UP;
2872 if (bond->current_arp_slave) {
2873 bond_set_slave_inactive_flags(
2874 bond->current_arp_slave);
2875 bond->current_arp_slave = NULL;
2876 }
2877
2878 pr_info("%s: link status definitely up for interface %s.\n",
2879 bond->dev->name, slave->dev->name);
2880
2881 if (!bond->curr_active_slave ||
2882 (slave == bond->primary_slave))
2883 goto do_failover;
2884
2885 }
2886
2887 continue;
2888
2889 case BOND_LINK_DOWN:
2890 if (slave->link_failure_count < UINT_MAX)
2891 slave->link_failure_count++;
2892
2893 slave->link = BOND_LINK_DOWN;
2894 bond_set_slave_inactive_flags(slave);
2895
2896 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2897 bond->dev->name, slave->dev->name);
2898
2899 if (slave == bond->curr_active_slave) {
2900 bond->current_arp_slave = NULL;
2901 goto do_failover;
2902 }
2903
2904 continue;
2905
2906 default:
2907 pr_err("%s: impossible: new_link %d on slave %s\n",
2908 bond->dev->name, slave->new_link,
2909 slave->dev->name);
2910 continue;
2911 }
2912
2913 do_failover:
2914 ASSERT_RTNL();
2915 block_netpoll_tx();
2916 write_lock_bh(&bond->curr_slave_lock);
2917 bond_select_active_slave(bond);
2918 write_unlock_bh(&bond->curr_slave_lock);
2919 unblock_netpoll_tx();
2920 }
2921
2922 bond_set_carrier(bond);
2923 }
2924
2925 /*
2926 * Send ARP probes for active-backup mode ARP monitor.
2927 *
2928 * Called with bond->lock held for read.
2929 */
2930 static void bond_ab_arp_probe(struct bonding *bond)
2931 {
2932 struct slave *slave, *next_slave;
2933 int i;
2934
2935 read_lock(&bond->curr_slave_lock);
2936
2937 if (bond->current_arp_slave && bond->curr_active_slave)
2938 pr_info("PROBE: c_arp %s && cas %s BAD\n",
2939 bond->current_arp_slave->dev->name,
2940 bond->curr_active_slave->dev->name);
2941
2942 if (bond->curr_active_slave) {
2943 bond_arp_send_all(bond, bond->curr_active_slave);
2944 read_unlock(&bond->curr_slave_lock);
2945 return;
2946 }
2947
2948 read_unlock(&bond->curr_slave_lock);
2949
2950 /* if we don't have a curr_active_slave, search for the next available
2951 * backup slave from the current_arp_slave and make it the candidate
2952 * for becoming the curr_active_slave
2953 */
2954
2955 if (!bond->current_arp_slave) {
2956 bond->current_arp_slave = bond_first_slave(bond);
2957 if (!bond->current_arp_slave)
2958 return;
2959 }
2960
2961 bond_set_slave_inactive_flags(bond->current_arp_slave);
2962
2963 /* search for next candidate */
2964 next_slave = bond_next_slave(bond, bond->current_arp_slave);
2965 bond_for_each_slave_from(bond, slave, i, next_slave) {
2966 if (IS_UP(slave->dev)) {
2967 slave->link = BOND_LINK_BACK;
2968 bond_set_slave_active_flags(slave);
2969 bond_arp_send_all(bond, slave);
2970 slave->jiffies = jiffies;
2971 bond->current_arp_slave = slave;
2972 break;
2973 }
2974
2975 /* if the link state is up at this point, we
2976 * mark it down - this can happen if we have
2977 * simultaneous link failures and
2978 * reselect_active_interface doesn't make this
2979 * one the current slave so it is still marked
2980 * up when it is actually down
2981 */
2982 if (slave->link == BOND_LINK_UP) {
2983 slave->link = BOND_LINK_DOWN;
2984 if (slave->link_failure_count < UINT_MAX)
2985 slave->link_failure_count++;
2986
2987 bond_set_slave_inactive_flags(slave);
2988
2989 pr_info("%s: backup interface %s is now down.\n",
2990 bond->dev->name, slave->dev->name);
2991 }
2992 }
2993 }
2994
2995 void bond_activebackup_arp_mon(struct work_struct *work)
2996 {
2997 struct bonding *bond = container_of(work, struct bonding,
2998 arp_work.work);
2999 bool should_notify_peers = false;
3000 int delta_in_ticks;
3001
3002 read_lock(&bond->lock);
3003
3004 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3005
3006 if (list_empty(&bond->slave_list))
3007 goto re_arm;
3008
3009 should_notify_peers = bond_should_notify_peers(bond);
3010
3011 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3012 read_unlock(&bond->lock);
3013
3014 /* Race avoidance with bond_close flush of workqueue */
3015 if (!rtnl_trylock()) {
3016 read_lock(&bond->lock);
3017 delta_in_ticks = 1;
3018 should_notify_peers = false;
3019 goto re_arm;
3020 }
3021
3022 read_lock(&bond->lock);
3023
3024 bond_ab_arp_commit(bond, delta_in_ticks);
3025
3026 read_unlock(&bond->lock);
3027 rtnl_unlock();
3028 read_lock(&bond->lock);
3029 }
3030
3031 bond_ab_arp_probe(bond);
3032
3033 re_arm:
3034 if (bond->params.arp_interval)
3035 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3036
3037 read_unlock(&bond->lock);
3038
3039 if (should_notify_peers) {
3040 if (!rtnl_trylock()) {
3041 read_lock(&bond->lock);
3042 bond->send_peer_notif++;
3043 read_unlock(&bond->lock);
3044 return;
3045 }
3046 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
3047 rtnl_unlock();
3048 }
3049 }
3050
3051 /*-------------------------- netdev event handling --------------------------*/
3052
3053 /*
3054 * Change device name
3055 */
3056 static int bond_event_changename(struct bonding *bond)
3057 {
3058 bond_remove_proc_entry(bond);
3059 bond_create_proc_entry(bond);
3060
3061 bond_debug_reregister(bond);
3062
3063 return NOTIFY_DONE;
3064 }
3065
3066 static int bond_master_netdev_event(unsigned long event,
3067 struct net_device *bond_dev)
3068 {
3069 struct bonding *event_bond = netdev_priv(bond_dev);
3070
3071 switch (event) {
3072 case NETDEV_CHANGENAME:
3073 return bond_event_changename(event_bond);
3074 case NETDEV_UNREGISTER:
3075 bond_remove_proc_entry(event_bond);
3076 break;
3077 case NETDEV_REGISTER:
3078 bond_create_proc_entry(event_bond);
3079 break;
3080 default:
3081 break;
3082 }
3083
3084 return NOTIFY_DONE;
3085 }
3086
3087 static int bond_slave_netdev_event(unsigned long event,
3088 struct net_device *slave_dev)
3089 {
3090 struct slave *slave = bond_slave_get_rtnl(slave_dev);
3091 struct bonding *bond;
3092 struct net_device *bond_dev;
3093 u32 old_speed;
3094 u8 old_duplex;
3095
3096 /* A netdev event can be generated while enslaving a device
3097 * before netdev_rx_handler_register is called in which case
3098 * slave will be NULL
3099 */
3100 if (!slave)
3101 return NOTIFY_DONE;
3102 bond_dev = slave->bond->dev;
3103 bond = slave->bond;
3104
3105 switch (event) {
3106 case NETDEV_UNREGISTER:
3107 if (bond_dev->type != ARPHRD_ETHER)
3108 bond_release_and_destroy(bond_dev, slave_dev);
3109 else
3110 bond_release(bond_dev, slave_dev);
3111 break;
3112 case NETDEV_UP:
3113 case NETDEV_CHANGE:
3114 old_speed = slave->speed;
3115 old_duplex = slave->duplex;
3116
3117 bond_update_speed_duplex(slave);
3118
3119 if (bond->params.mode == BOND_MODE_8023AD) {
3120 if (old_speed != slave->speed)
3121 bond_3ad_adapter_speed_changed(slave);
3122 if (old_duplex != slave->duplex)
3123 bond_3ad_adapter_duplex_changed(slave);
3124 }
3125 break;
3126 case NETDEV_DOWN:
3127 /*
3128 * ... Or is it this?
3129 */
3130 break;
3131 case NETDEV_CHANGEMTU:
3132 /*
3133 * TODO: Should slaves be allowed to
3134 * independently alter their MTU? For
3135 * an active-backup bond, slaves need
3136 * not be the same type of device, so
3137 * MTUs may vary. For other modes,
3138 * slaves arguably should have the
3139 * same MTUs. To do this, we'd need to
3140 * take over the slave's change_mtu
3141 * function for the duration of their
3142 * servitude.
3143 */
3144 break;
3145 case NETDEV_CHANGENAME:
3146 /*
3147 * TODO: handle changing the primary's name
3148 */
3149 break;
3150 case NETDEV_FEAT_CHANGE:
3151 bond_compute_features(bond);
3152 break;
3153 case NETDEV_RESEND_IGMP:
3154 /* Propagate to master device */
3155 call_netdevice_notifiers(event, slave->bond->dev);
3156 break;
3157 default:
3158 break;
3159 }
3160
3161 return NOTIFY_DONE;
3162 }
3163
3164 /*
3165 * bond_netdev_event: handle netdev notifier chain events.
3166 *
3167 * This function receives events for the netdev chain. The caller (an
3168 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3169 * locks for us to safely manipulate the slave devices (RTNL lock,
3170 * dev_probe_lock).
3171 */
3172 static int bond_netdev_event(struct notifier_block *this,
3173 unsigned long event, void *ptr)
3174 {
3175 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3176
3177 pr_debug("event_dev: %s, event: %lx\n",
3178 event_dev ? event_dev->name : "None",
3179 event);
3180
3181 if (!(event_dev->priv_flags & IFF_BONDING))
3182 return NOTIFY_DONE;
3183
3184 if (event_dev->flags & IFF_MASTER) {
3185 pr_debug("IFF_MASTER\n");
3186 return bond_master_netdev_event(event, event_dev);
3187 }
3188
3189 if (event_dev->flags & IFF_SLAVE) {
3190 pr_debug("IFF_SLAVE\n");
3191 return bond_slave_netdev_event(event, event_dev);
3192 }
3193
3194 return NOTIFY_DONE;
3195 }
3196
3197 static struct notifier_block bond_netdev_notifier = {
3198 .notifier_call = bond_netdev_event,
3199 };
3200
3201 /*---------------------------- Hashing Policies -----------------------------*/
3202
3203 /*
3204 * Hash for the output device based upon layer 2 data
3205 */
3206 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3207 {
3208 struct ethhdr *data = (struct ethhdr *)skb->data;
3209
3210 if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
3211 return (data->h_dest[5] ^ data->h_source[5]) % count;
3212
3213 return 0;
3214 }
3215
3216 /*
3217 * Hash for the output device based upon layer 2 and layer 3 data. If
3218 * the packet is not IP, fall back on bond_xmit_hash_policy_l2()
3219 */
3220 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3221 {
3222 const struct ethhdr *data;
3223 const struct iphdr *iph;
3224 const struct ipv6hdr *ipv6h;
3225 u32 v6hash;
3226 const __be32 *s, *d;
3227
3228 if (skb->protocol == htons(ETH_P_IP) &&
3229 pskb_network_may_pull(skb, sizeof(*iph))) {
3230 iph = ip_hdr(skb);
3231 data = (struct ethhdr *)skb->data;
3232 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3233 (data->h_dest[5] ^ data->h_source[5])) % count;
3234 } else if (skb->protocol == htons(ETH_P_IPV6) &&
3235 pskb_network_may_pull(skb, sizeof(*ipv6h))) {
3236 ipv6h = ipv6_hdr(skb);
3237 data = (struct ethhdr *)skb->data;
3238 s = &ipv6h->saddr.s6_addr32[0];
3239 d = &ipv6h->daddr.s6_addr32[0];
3240 v6hash = (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3241 v6hash ^= (v6hash >> 24) ^ (v6hash >> 16) ^ (v6hash >> 8);
3242 return (v6hash ^ data->h_dest[5] ^ data->h_source[5]) % count;
3243 }
3244
3245 return bond_xmit_hash_policy_l2(skb, count);
3246 }
3247
3248 /*
3249 * Hash for the output device based upon layer 3 and layer 4 data. If
3250 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3251 * altogether not IP, fall back on bond_xmit_hash_policy_l2()
3252 */
3253 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3254 {
3255 u32 layer4_xor = 0;
3256 const struct iphdr *iph;
3257 const struct ipv6hdr *ipv6h;
3258 const __be32 *s, *d;
3259 const __be16 *l4 = NULL;
3260 __be16 _l4[2];
3261 int noff = skb_network_offset(skb);
3262 int poff;
3263
3264 if (skb->protocol == htons(ETH_P_IP) &&
3265 pskb_may_pull(skb, noff + sizeof(*iph))) {
3266 iph = ip_hdr(skb);
3267 poff = proto_ports_offset(iph->protocol);
3268
3269 if (!ip_is_fragment(iph) && poff >= 0) {
3270 l4 = skb_header_pointer(skb, noff + (iph->ihl << 2) + poff,
3271 sizeof(_l4), &_l4);
3272 if (l4)
3273 layer4_xor = ntohs(l4[0] ^ l4[1]);
3274 }
3275 return (layer4_xor ^
3276 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3277 } else if (skb->protocol == htons(ETH_P_IPV6) &&
3278 pskb_may_pull(skb, noff + sizeof(*ipv6h))) {
3279 ipv6h = ipv6_hdr(skb);
3280 poff = proto_ports_offset(ipv6h->nexthdr);
3281 if (poff >= 0) {
3282 l4 = skb_header_pointer(skb, noff + sizeof(*ipv6h) + poff,
3283 sizeof(_l4), &_l4);
3284 if (l4)
3285 layer4_xor = ntohs(l4[0] ^ l4[1]);
3286 }
3287 s = &ipv6h->saddr.s6_addr32[0];
3288 d = &ipv6h->daddr.s6_addr32[0];
3289 layer4_xor ^= (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3290 layer4_xor ^= (layer4_xor >> 24) ^ (layer4_xor >> 16) ^
3291 (layer4_xor >> 8);
3292 return layer4_xor % count;
3293 }
3294
3295 return bond_xmit_hash_policy_l2(skb, count);
3296 }
3297
3298 /*-------------------------- Device entry points ----------------------------*/
3299
3300 static void bond_work_init_all(struct bonding *bond)
3301 {
3302 INIT_DELAYED_WORK(&bond->mcast_work,
3303 bond_resend_igmp_join_requests_delayed);
3304 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3305 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3306 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3307 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3308 else
3309 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3310 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3311 }
3312
3313 static void bond_work_cancel_all(struct bonding *bond)
3314 {
3315 cancel_delayed_work_sync(&bond->mii_work);
3316 cancel_delayed_work_sync(&bond->arp_work);
3317 cancel_delayed_work_sync(&bond->alb_work);
3318 cancel_delayed_work_sync(&bond->ad_work);
3319 cancel_delayed_work_sync(&bond->mcast_work);
3320 }
3321
3322 static int bond_open(struct net_device *bond_dev)
3323 {
3324 struct bonding *bond = netdev_priv(bond_dev);
3325 struct slave *slave;
3326
3327 /* reset slave->backup and slave->inactive */
3328 read_lock(&bond->lock);
3329 if (!list_empty(&bond->slave_list)) {
3330 read_lock(&bond->curr_slave_lock);
3331 bond_for_each_slave(bond, slave) {
3332 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3333 && (slave != bond->curr_active_slave)) {
3334 bond_set_slave_inactive_flags(slave);
3335 } else {
3336 bond_set_slave_active_flags(slave);
3337 }
3338 }
3339 read_unlock(&bond->curr_slave_lock);
3340 }
3341 read_unlock(&bond->lock);
3342
3343 bond_work_init_all(bond);
3344
3345 if (bond_is_lb(bond)) {
3346 /* bond_alb_initialize must be called before the timer
3347 * is started.
3348 */
3349 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3350 return -ENOMEM;
3351 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3352 }
3353
3354 if (bond->params.miimon) /* link check interval, in milliseconds. */
3355 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3356
3357 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3358 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3359 if (bond->params.arp_validate)
3360 bond->recv_probe = bond_arp_rcv;
3361 }
3362
3363 if (bond->params.mode == BOND_MODE_8023AD) {
3364 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3365 /* register to receive LACPDUs */
3366 bond->recv_probe = bond_3ad_lacpdu_recv;
3367 bond_3ad_initiate_agg_selection(bond, 1);
3368 }
3369
3370 return 0;
3371 }
3372
3373 static int bond_close(struct net_device *bond_dev)
3374 {
3375 struct bonding *bond = netdev_priv(bond_dev);
3376
3377 write_lock_bh(&bond->lock);
3378 bond->send_peer_notif = 0;
3379 write_unlock_bh(&bond->lock);
3380
3381 bond_work_cancel_all(bond);
3382 if (bond_is_lb(bond)) {
3383 /* Must be called only after all
3384 * slaves have been released
3385 */
3386 bond_alb_deinitialize(bond);
3387 }
3388 bond->recv_probe = NULL;
3389
3390 return 0;
3391 }
3392
3393 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3394 struct rtnl_link_stats64 *stats)
3395 {
3396 struct bonding *bond = netdev_priv(bond_dev);
3397 struct rtnl_link_stats64 temp;
3398 struct slave *slave;
3399
3400 memset(stats, 0, sizeof(*stats));
3401
3402 read_lock_bh(&bond->lock);
3403 bond_for_each_slave(bond, slave) {
3404 const struct rtnl_link_stats64 *sstats =
3405 dev_get_stats(slave->dev, &temp);
3406
3407 stats->rx_packets += sstats->rx_packets;
3408 stats->rx_bytes += sstats->rx_bytes;
3409 stats->rx_errors += sstats->rx_errors;
3410 stats->rx_dropped += sstats->rx_dropped;
3411
3412 stats->tx_packets += sstats->tx_packets;
3413 stats->tx_bytes += sstats->tx_bytes;
3414 stats->tx_errors += sstats->tx_errors;
3415 stats->tx_dropped += sstats->tx_dropped;
3416
3417 stats->multicast += sstats->multicast;
3418 stats->collisions += sstats->collisions;
3419
3420 stats->rx_length_errors += sstats->rx_length_errors;
3421 stats->rx_over_errors += sstats->rx_over_errors;
3422 stats->rx_crc_errors += sstats->rx_crc_errors;
3423 stats->rx_frame_errors += sstats->rx_frame_errors;
3424 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3425 stats->rx_missed_errors += sstats->rx_missed_errors;
3426
3427 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3428 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3429 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3430 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3431 stats->tx_window_errors += sstats->tx_window_errors;
3432 }
3433 read_unlock_bh(&bond->lock);
3434
3435 return stats;
3436 }
3437
3438 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3439 {
3440 struct net_device *slave_dev = NULL;
3441 struct ifbond k_binfo;
3442 struct ifbond __user *u_binfo = NULL;
3443 struct ifslave k_sinfo;
3444 struct ifslave __user *u_sinfo = NULL;
3445 struct mii_ioctl_data *mii = NULL;
3446 struct net *net;
3447 int res = 0;
3448
3449 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3450
3451 switch (cmd) {
3452 case SIOCGMIIPHY:
3453 mii = if_mii(ifr);
3454 if (!mii)
3455 return -EINVAL;
3456
3457 mii->phy_id = 0;
3458 /* Fall Through */
3459 case SIOCGMIIREG:
3460 /*
3461 * We do this again just in case we were called by SIOCGMIIREG
3462 * instead of SIOCGMIIPHY.
3463 */
3464 mii = if_mii(ifr);
3465 if (!mii)
3466 return -EINVAL;
3467
3468
3469 if (mii->reg_num == 1) {
3470 struct bonding *bond = netdev_priv(bond_dev);
3471 mii->val_out = 0;
3472 read_lock(&bond->lock);
3473 read_lock(&bond->curr_slave_lock);
3474 if (netif_carrier_ok(bond->dev))
3475 mii->val_out = BMSR_LSTATUS;
3476
3477 read_unlock(&bond->curr_slave_lock);
3478 read_unlock(&bond->lock);
3479 }
3480
3481 return 0;
3482 case BOND_INFO_QUERY_OLD:
3483 case SIOCBONDINFOQUERY:
3484 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3485
3486 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3487 return -EFAULT;
3488
3489 res = bond_info_query(bond_dev, &k_binfo);
3490 if (res == 0 &&
3491 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3492 return -EFAULT;
3493
3494 return res;
3495 case BOND_SLAVE_INFO_QUERY_OLD:
3496 case SIOCBONDSLAVEINFOQUERY:
3497 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3498
3499 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3500 return -EFAULT;
3501
3502 res = bond_slave_info_query(bond_dev, &k_sinfo);
3503 if (res == 0 &&
3504 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3505 return -EFAULT;
3506
3507 return res;
3508 default:
3509 /* Go on */
3510 break;
3511 }
3512
3513 net = dev_net(bond_dev);
3514
3515 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3516 return -EPERM;
3517
3518 slave_dev = dev_get_by_name(net, ifr->ifr_slave);
3519
3520 pr_debug("slave_dev=%p:\n", slave_dev);
3521
3522 if (!slave_dev)
3523 res = -ENODEV;
3524 else {
3525 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3526 switch (cmd) {
3527 case BOND_ENSLAVE_OLD:
3528 case SIOCBONDENSLAVE:
3529 res = bond_enslave(bond_dev, slave_dev);
3530 break;
3531 case BOND_RELEASE_OLD:
3532 case SIOCBONDRELEASE:
3533 res = bond_release(bond_dev, slave_dev);
3534 break;
3535 case BOND_SETHWADDR_OLD:
3536 case SIOCBONDSETHWADDR:
3537 bond_set_dev_addr(bond_dev, slave_dev);
3538 res = 0;
3539 break;
3540 case BOND_CHANGE_ACTIVE_OLD:
3541 case SIOCBONDCHANGEACTIVE:
3542 res = bond_ioctl_change_active(bond_dev, slave_dev);
3543 break;
3544 default:
3545 res = -EOPNOTSUPP;
3546 }
3547
3548 dev_put(slave_dev);
3549 }
3550
3551 return res;
3552 }
3553
3554 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3555 {
3556 struct bonding *bond = netdev_priv(bond_dev);
3557
3558 if (change & IFF_PROMISC)
3559 bond_set_promiscuity(bond,
3560 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3561
3562 if (change & IFF_ALLMULTI)
3563 bond_set_allmulti(bond,
3564 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3565 }
3566
3567 static void bond_set_rx_mode(struct net_device *bond_dev)
3568 {
3569 struct bonding *bond = netdev_priv(bond_dev);
3570 struct slave *slave;
3571
3572 read_lock(&bond->lock);
3573
3574 if (USES_PRIMARY(bond->params.mode)) {
3575 read_lock(&bond->curr_slave_lock);
3576 slave = bond->curr_active_slave;
3577 if (slave) {
3578 dev_uc_sync(slave->dev, bond_dev);
3579 dev_mc_sync(slave->dev, bond_dev);
3580 }
3581 read_unlock(&bond->curr_slave_lock);
3582 } else {
3583 bond_for_each_slave(bond, slave) {
3584 dev_uc_sync_multiple(slave->dev, bond_dev);
3585 dev_mc_sync_multiple(slave->dev, bond_dev);
3586 }
3587 }
3588
3589 read_unlock(&bond->lock);
3590 }
3591
3592 static int bond_neigh_init(struct neighbour *n)
3593 {
3594 struct bonding *bond = netdev_priv(n->dev);
3595 const struct net_device_ops *slave_ops;
3596 struct neigh_parms parms;
3597 struct slave *slave;
3598 int ret;
3599
3600 slave = bond_first_slave(bond);
3601 if (!slave)
3602 return 0;
3603 slave_ops = slave->dev->netdev_ops;
3604 if (!slave_ops->ndo_neigh_setup)
3605 return 0;
3606
3607 parms.neigh_setup = NULL;
3608 parms.neigh_cleanup = NULL;
3609 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3610 if (ret)
3611 return ret;
3612
3613 /*
3614 * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3615 * after the last slave has been detached. Assumes that all slaves
3616 * utilize the same neigh_cleanup (true at this writing as only user
3617 * is ipoib).
3618 */
3619 n->parms->neigh_cleanup = parms.neigh_cleanup;
3620
3621 if (!parms.neigh_setup)
3622 return 0;
3623
3624 return parms.neigh_setup(n);
3625 }
3626
3627 /*
3628 * The bonding ndo_neigh_setup is called at init time beofre any
3629 * slave exists. So we must declare proxy setup function which will
3630 * be used at run time to resolve the actual slave neigh param setup.
3631 */
3632 static int bond_neigh_setup(struct net_device *dev,
3633 struct neigh_parms *parms)
3634 {
3635 parms->neigh_setup = bond_neigh_init;
3636
3637 return 0;
3638 }
3639
3640 /*
3641 * Change the MTU of all of a master's slaves to match the master
3642 */
3643 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3644 {
3645 struct bonding *bond = netdev_priv(bond_dev);
3646 struct slave *slave;
3647 int res = 0;
3648
3649 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3650 (bond_dev ? bond_dev->name : "None"), new_mtu);
3651
3652 /* Can't hold bond->lock with bh disabled here since
3653 * some base drivers panic. On the other hand we can't
3654 * hold bond->lock without bh disabled because we'll
3655 * deadlock. The only solution is to rely on the fact
3656 * that we're under rtnl_lock here, and the slaves
3657 * list won't change. This doesn't solve the problem
3658 * of setting the slave's MTU while it is
3659 * transmitting, but the assumption is that the base
3660 * driver can handle that.
3661 *
3662 * TODO: figure out a way to safely iterate the slaves
3663 * list, but without holding a lock around the actual
3664 * call to the base driver.
3665 */
3666
3667 bond_for_each_slave(bond, slave) {
3668 pr_debug("s %p s->p %p c_m %p\n",
3669 slave,
3670 bond_prev_slave(bond, slave),
3671 slave->dev->netdev_ops->ndo_change_mtu);
3672
3673 res = dev_set_mtu(slave->dev, new_mtu);
3674
3675 if (res) {
3676 /* If we failed to set the slave's mtu to the new value
3677 * we must abort the operation even in ACTIVE_BACKUP
3678 * mode, because if we allow the backup slaves to have
3679 * different mtu values than the active slave we'll
3680 * need to change their mtu when doing a failover. That
3681 * means changing their mtu from timer context, which
3682 * is probably not a good idea.
3683 */
3684 pr_debug("err %d %s\n", res, slave->dev->name);
3685 goto unwind;
3686 }
3687 }
3688
3689 bond_dev->mtu = new_mtu;
3690
3691 return 0;
3692
3693 unwind:
3694 /* unwind from head to the slave that failed */
3695 bond_for_each_slave_continue_reverse(bond, slave) {
3696 int tmp_res;
3697
3698 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3699 if (tmp_res) {
3700 pr_debug("unwind err %d dev %s\n",
3701 tmp_res, slave->dev->name);
3702 }
3703 }
3704
3705 return res;
3706 }
3707
3708 /*
3709 * Change HW address
3710 *
3711 * Note that many devices must be down to change the HW address, and
3712 * downing the master releases all slaves. We can make bonds full of
3713 * bonding devices to test this, however.
3714 */
3715 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3716 {
3717 struct bonding *bond = netdev_priv(bond_dev);
3718 struct sockaddr *sa = addr, tmp_sa;
3719 struct slave *slave;
3720 int res = 0;
3721
3722 if (bond->params.mode == BOND_MODE_ALB)
3723 return bond_alb_set_mac_address(bond_dev, addr);
3724
3725
3726 pr_debug("bond=%p, name=%s\n",
3727 bond, bond_dev ? bond_dev->name : "None");
3728
3729 /* If fail_over_mac is enabled, do nothing and return success.
3730 * Returning an error causes ifenslave to fail.
3731 */
3732 if (bond->params.fail_over_mac)
3733 return 0;
3734
3735 if (!is_valid_ether_addr(sa->sa_data))
3736 return -EADDRNOTAVAIL;
3737
3738 /* Can't hold bond->lock with bh disabled here since
3739 * some base drivers panic. On the other hand we can't
3740 * hold bond->lock without bh disabled because we'll
3741 * deadlock. The only solution is to rely on the fact
3742 * that we're under rtnl_lock here, and the slaves
3743 * list won't change. This doesn't solve the problem
3744 * of setting the slave's hw address while it is
3745 * transmitting, but the assumption is that the base
3746 * driver can handle that.
3747 *
3748 * TODO: figure out a way to safely iterate the slaves
3749 * list, but without holding a lock around the actual
3750 * call to the base driver.
3751 */
3752
3753 bond_for_each_slave(bond, slave) {
3754 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3755 pr_debug("slave %p %s\n", slave, slave->dev->name);
3756
3757 if (slave_ops->ndo_set_mac_address == NULL) {
3758 res = -EOPNOTSUPP;
3759 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3760 goto unwind;
3761 }
3762
3763 res = dev_set_mac_address(slave->dev, addr);
3764 if (res) {
3765 /* TODO: consider downing the slave
3766 * and retry ?
3767 * User should expect communications
3768 * breakage anyway until ARP finish
3769 * updating, so...
3770 */
3771 pr_debug("err %d %s\n", res, slave->dev->name);
3772 goto unwind;
3773 }
3774 }
3775
3776 /* success */
3777 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3778 return 0;
3779
3780 unwind:
3781 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3782 tmp_sa.sa_family = bond_dev->type;
3783
3784 /* unwind from head to the slave that failed */
3785 bond_for_each_slave_continue_reverse(bond, slave) {
3786 int tmp_res;
3787
3788 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3789 if (tmp_res) {
3790 pr_debug("unwind err %d dev %s\n",
3791 tmp_res, slave->dev->name);
3792 }
3793 }
3794
3795 return res;
3796 }
3797
3798 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3799 {
3800 struct bonding *bond = netdev_priv(bond_dev);
3801 struct slave *slave, *start_at;
3802 int i, slave_no, res = 1;
3803 struct iphdr *iph = ip_hdr(skb);
3804
3805 /*
3806 * Start with the curr_active_slave that joined the bond as the
3807 * default for sending IGMP traffic. For failover purposes one
3808 * needs to maintain some consistency for the interface that will
3809 * send the join/membership reports. The curr_active_slave found
3810 * will send all of this type of traffic.
3811 */
3812 if ((iph->protocol == IPPROTO_IGMP) &&
3813 (skb->protocol == htons(ETH_P_IP))) {
3814 slave = bond->curr_active_slave;
3815 if (!slave)
3816 goto out;
3817 } else {
3818 /*
3819 * Concurrent TX may collide on rr_tx_counter; we accept
3820 * that as being rare enough not to justify using an
3821 * atomic op here.
3822 */
3823 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3824
3825 bond_for_each_slave(bond, slave) {
3826 slave_no--;
3827 if (slave_no < 0)
3828 break;
3829 }
3830 }
3831
3832 start_at = slave;
3833 bond_for_each_slave_from(bond, slave, i, start_at) {
3834 if (IS_UP(slave->dev) &&
3835 (slave->link == BOND_LINK_UP) &&
3836 bond_is_active_slave(slave)) {
3837 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3838 break;
3839 }
3840 }
3841
3842 out:
3843 if (res) {
3844 /* no suitable interface, frame not sent */
3845 kfree_skb(skb);
3846 }
3847
3848 return NETDEV_TX_OK;
3849 }
3850
3851
3852 /*
3853 * in active-backup mode, we know that bond->curr_active_slave is always valid if
3854 * the bond has a usable interface.
3855 */
3856 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3857 {
3858 struct bonding *bond = netdev_priv(bond_dev);
3859 struct slave *slave;
3860 int res = 1;
3861
3862 slave = bond->curr_active_slave;
3863 if (slave)
3864 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3865
3866 if (res)
3867 /* no suitable interface, frame not sent */
3868 kfree_skb(skb);
3869
3870 return NETDEV_TX_OK;
3871 }
3872
3873 /*
3874 * In bond_xmit_xor() , we determine the output device by using a pre-
3875 * determined xmit_hash_policy(), If the selected device is not enabled,
3876 * find the next active slave.
3877 */
3878 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3879 {
3880 struct bonding *bond = netdev_priv(bond_dev);
3881 struct slave *slave, *start_at;
3882 int slave_no;
3883 int i;
3884 int res = 1;
3885
3886 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
3887
3888 bond_for_each_slave(bond, slave) {
3889 slave_no--;
3890 if (slave_no < 0)
3891 break;
3892 }
3893
3894 start_at = slave;
3895
3896 bond_for_each_slave_from(bond, slave, i, start_at) {
3897 if (IS_UP(slave->dev) &&
3898 (slave->link == BOND_LINK_UP) &&
3899 bond_is_active_slave(slave)) {
3900 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3901 break;
3902 }
3903 }
3904
3905 if (res) {
3906 /* no suitable interface, frame not sent */
3907 kfree_skb(skb);
3908 }
3909
3910 return NETDEV_TX_OK;
3911 }
3912
3913 /* in broadcast mode, we send everything to all usable interfaces. */
3914 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3915 {
3916 struct bonding *bond = netdev_priv(bond_dev);
3917 struct slave *slave = NULL;
3918
3919 bond_for_each_slave(bond, slave) {
3920 if (bond_is_last_slave(bond, slave))
3921 break;
3922 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
3923 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3924
3925 if (!skb2) {
3926 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
3927 bond_dev->name);
3928 continue;
3929 }
3930 /* bond_dev_queue_xmit always returns 0 */
3931 bond_dev_queue_xmit(bond, skb2, slave->dev);
3932 }
3933 }
3934 if (slave && IS_UP(slave->dev) && slave->link == BOND_LINK_UP)
3935 bond_dev_queue_xmit(bond, skb, slave->dev);
3936 else
3937 kfree_skb(skb);
3938
3939 return NETDEV_TX_OK;
3940 }
3941
3942 /*------------------------- Device initialization ---------------------------*/
3943
3944 static void bond_set_xmit_hash_policy(struct bonding *bond)
3945 {
3946 switch (bond->params.xmit_policy) {
3947 case BOND_XMIT_POLICY_LAYER23:
3948 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
3949 break;
3950 case BOND_XMIT_POLICY_LAYER34:
3951 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
3952 break;
3953 case BOND_XMIT_POLICY_LAYER2:
3954 default:
3955 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
3956 break;
3957 }
3958 }
3959
3960 /*
3961 * Lookup the slave that corresponds to a qid
3962 */
3963 static inline int bond_slave_override(struct bonding *bond,
3964 struct sk_buff *skb)
3965 {
3966 struct slave *slave = NULL;
3967 struct slave *check_slave;
3968 int res = 1;
3969
3970 if (!skb->queue_mapping)
3971 return 1;
3972
3973 /* Find out if any slaves have the same mapping as this skb. */
3974 bond_for_each_slave(bond, check_slave) {
3975 if (check_slave->queue_id == skb->queue_mapping) {
3976 slave = check_slave;
3977 break;
3978 }
3979 }
3980
3981 /* If the slave isn't UP, use default transmit policy. */
3982 if (slave && slave->queue_id && IS_UP(slave->dev) &&
3983 (slave->link == BOND_LINK_UP)) {
3984 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3985 }
3986
3987 return res;
3988 }
3989
3990
3991 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
3992 {
3993 /*
3994 * This helper function exists to help dev_pick_tx get the correct
3995 * destination queue. Using a helper function skips a call to
3996 * skb_tx_hash and will put the skbs in the queue we expect on their
3997 * way down to the bonding driver.
3998 */
3999 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4000
4001 /*
4002 * Save the original txq to restore before passing to the driver
4003 */
4004 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4005
4006 if (unlikely(txq >= dev->real_num_tx_queues)) {
4007 do {
4008 txq -= dev->real_num_tx_queues;
4009 } while (txq >= dev->real_num_tx_queues);
4010 }
4011 return txq;
4012 }
4013
4014 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4015 {
4016 struct bonding *bond = netdev_priv(dev);
4017
4018 if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4019 if (!bond_slave_override(bond, skb))
4020 return NETDEV_TX_OK;
4021 }
4022
4023 switch (bond->params.mode) {
4024 case BOND_MODE_ROUNDROBIN:
4025 return bond_xmit_roundrobin(skb, dev);
4026 case BOND_MODE_ACTIVEBACKUP:
4027 return bond_xmit_activebackup(skb, dev);
4028 case BOND_MODE_XOR:
4029 return bond_xmit_xor(skb, dev);
4030 case BOND_MODE_BROADCAST:
4031 return bond_xmit_broadcast(skb, dev);
4032 case BOND_MODE_8023AD:
4033 return bond_3ad_xmit_xor(skb, dev);
4034 case BOND_MODE_ALB:
4035 case BOND_MODE_TLB:
4036 return bond_alb_xmit(skb, dev);
4037 default:
4038 /* Should never happen, mode already checked */
4039 pr_err("%s: Error: Unknown bonding mode %d\n",
4040 dev->name, bond->params.mode);
4041 WARN_ON_ONCE(1);
4042 kfree_skb(skb);
4043 return NETDEV_TX_OK;
4044 }
4045 }
4046
4047 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4048 {
4049 struct bonding *bond = netdev_priv(dev);
4050 netdev_tx_t ret = NETDEV_TX_OK;
4051
4052 /*
4053 * If we risk deadlock from transmitting this in the
4054 * netpoll path, tell netpoll to queue the frame for later tx
4055 */
4056 if (is_netpoll_tx_blocked(dev))
4057 return NETDEV_TX_BUSY;
4058
4059 read_lock(&bond->lock);
4060
4061 if (!list_empty(&bond->slave_list))
4062 ret = __bond_start_xmit(skb, dev);
4063 else
4064 kfree_skb(skb);
4065
4066 read_unlock(&bond->lock);
4067
4068 return ret;
4069 }
4070
4071 /*
4072 * set bond mode specific net device operations
4073 */
4074 void bond_set_mode_ops(struct bonding *bond, int mode)
4075 {
4076 struct net_device *bond_dev = bond->dev;
4077
4078 switch (mode) {
4079 case BOND_MODE_ROUNDROBIN:
4080 break;
4081 case BOND_MODE_ACTIVEBACKUP:
4082 break;
4083 case BOND_MODE_XOR:
4084 bond_set_xmit_hash_policy(bond);
4085 break;
4086 case BOND_MODE_BROADCAST:
4087 break;
4088 case BOND_MODE_8023AD:
4089 bond_set_xmit_hash_policy(bond);
4090 break;
4091 case BOND_MODE_ALB:
4092 /* FALLTHRU */
4093 case BOND_MODE_TLB:
4094 break;
4095 default:
4096 /* Should never happen, mode already checked */
4097 pr_err("%s: Error: Unknown bonding mode %d\n",
4098 bond_dev->name, mode);
4099 break;
4100 }
4101 }
4102
4103 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4104 struct ethtool_cmd *ecmd)
4105 {
4106 struct bonding *bond = netdev_priv(bond_dev);
4107 unsigned long speed = 0;
4108 struct slave *slave;
4109
4110 ecmd->duplex = DUPLEX_UNKNOWN;
4111 ecmd->port = PORT_OTHER;
4112
4113 /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
4114 * do not need to check mode. Though link speed might not represent
4115 * the true receive or transmit bandwidth (not all modes are symmetric)
4116 * this is an accurate maximum.
4117 */
4118 read_lock(&bond->lock);
4119 bond_for_each_slave(bond, slave) {
4120 if (SLAVE_IS_OK(slave)) {
4121 if (slave->speed != SPEED_UNKNOWN)
4122 speed += slave->speed;
4123 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4124 slave->duplex != DUPLEX_UNKNOWN)
4125 ecmd->duplex = slave->duplex;
4126 }
4127 }
4128 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4129 read_unlock(&bond->lock);
4130
4131 return 0;
4132 }
4133
4134 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4135 struct ethtool_drvinfo *drvinfo)
4136 {
4137 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4138 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4139 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4140 BOND_ABI_VERSION);
4141 }
4142
4143 static const struct ethtool_ops bond_ethtool_ops = {
4144 .get_drvinfo = bond_ethtool_get_drvinfo,
4145 .get_settings = bond_ethtool_get_settings,
4146 .get_link = ethtool_op_get_link,
4147 };
4148
4149 static const struct net_device_ops bond_netdev_ops = {
4150 .ndo_init = bond_init,
4151 .ndo_uninit = bond_uninit,
4152 .ndo_open = bond_open,
4153 .ndo_stop = bond_close,
4154 .ndo_start_xmit = bond_start_xmit,
4155 .ndo_select_queue = bond_select_queue,
4156 .ndo_get_stats64 = bond_get_stats,
4157 .ndo_do_ioctl = bond_do_ioctl,
4158 .ndo_change_rx_flags = bond_change_rx_flags,
4159 .ndo_set_rx_mode = bond_set_rx_mode,
4160 .ndo_change_mtu = bond_change_mtu,
4161 .ndo_set_mac_address = bond_set_mac_address,
4162 .ndo_neigh_setup = bond_neigh_setup,
4163 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4164 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4165 #ifdef CONFIG_NET_POLL_CONTROLLER
4166 .ndo_netpoll_setup = bond_netpoll_setup,
4167 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4168 .ndo_poll_controller = bond_poll_controller,
4169 #endif
4170 .ndo_add_slave = bond_enslave,
4171 .ndo_del_slave = bond_release,
4172 .ndo_fix_features = bond_fix_features,
4173 };
4174
4175 static const struct device_type bond_type = {
4176 .name = "bond",
4177 };
4178
4179 static void bond_destructor(struct net_device *bond_dev)
4180 {
4181 struct bonding *bond = netdev_priv(bond_dev);
4182 if (bond->wq)
4183 destroy_workqueue(bond->wq);
4184 free_netdev(bond_dev);
4185 }
4186
4187 static void bond_setup(struct net_device *bond_dev)
4188 {
4189 struct bonding *bond = netdev_priv(bond_dev);
4190
4191 /* initialize rwlocks */
4192 rwlock_init(&bond->lock);
4193 rwlock_init(&bond->curr_slave_lock);
4194 INIT_LIST_HEAD(&bond->slave_list);
4195 bond->params = bonding_defaults;
4196
4197 /* Initialize pointers */
4198 bond->dev = bond_dev;
4199 INIT_LIST_HEAD(&bond->vlan_list);
4200
4201 /* Initialize the device entry points */
4202 ether_setup(bond_dev);
4203 bond_dev->netdev_ops = &bond_netdev_ops;
4204 bond_dev->ethtool_ops = &bond_ethtool_ops;
4205 bond_set_mode_ops(bond, bond->params.mode);
4206
4207 bond_dev->destructor = bond_destructor;
4208
4209 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4210
4211 /* Initialize the device options */
4212 bond_dev->tx_queue_len = 0;
4213 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4214 bond_dev->priv_flags |= IFF_BONDING;
4215 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4216
4217 /* At first, we block adding VLANs. That's the only way to
4218 * prevent problems that occur when adding VLANs over an
4219 * empty bond. The block will be removed once non-challenged
4220 * slaves are enslaved.
4221 */
4222 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4223
4224 /* don't acquire bond device's netif_tx_lock when
4225 * transmitting */
4226 bond_dev->features |= NETIF_F_LLTX;
4227
4228 /* By default, we declare the bond to be fully
4229 * VLAN hardware accelerated capable. Special
4230 * care is taken in the various xmit functions
4231 * when there are slaves that are not hw accel
4232 * capable
4233 */
4234
4235 bond_dev->hw_features = BOND_VLAN_FEATURES |
4236 NETIF_F_HW_VLAN_CTAG_TX |
4237 NETIF_F_HW_VLAN_CTAG_RX |
4238 NETIF_F_HW_VLAN_CTAG_FILTER;
4239
4240 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4241 bond_dev->features |= bond_dev->hw_features;
4242 }
4243
4244 /*
4245 * Destroy a bonding device.
4246 * Must be under rtnl_lock when this function is called.
4247 */
4248 static void bond_uninit(struct net_device *bond_dev)
4249 {
4250 struct bonding *bond = netdev_priv(bond_dev);
4251 struct slave *slave, *tmp_slave;
4252 struct vlan_entry *vlan, *tmp;
4253
4254 bond_netpoll_cleanup(bond_dev);
4255
4256 /* Release the bonded slaves */
4257 list_for_each_entry_safe(slave, tmp_slave, &bond->slave_list, list)
4258 __bond_release_one(bond_dev, slave->dev, true);
4259 pr_info("%s: released all slaves\n", bond_dev->name);
4260
4261 list_del(&bond->bond_list);
4262
4263 bond_debug_unregister(bond);
4264
4265 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4266 list_del(&vlan->vlan_list);
4267 kfree(vlan);
4268 }
4269 }
4270
4271 /*------------------------- Module initialization ---------------------------*/
4272
4273 /*
4274 * Convert string input module parms. Accept either the
4275 * number of the mode or its string name. A bit complicated because
4276 * some mode names are substrings of other names, and calls from sysfs
4277 * may have whitespace in the name (trailing newlines, for example).
4278 */
4279 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4280 {
4281 int modeint = -1, i, rv;
4282 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4283
4284 for (p = (char *)buf; *p; p++)
4285 if (!(isdigit(*p) || isspace(*p)))
4286 break;
4287
4288 if (*p)
4289 rv = sscanf(buf, "%20s", modestr);
4290 else
4291 rv = sscanf(buf, "%d", &modeint);
4292
4293 if (!rv)
4294 return -1;
4295
4296 for (i = 0; tbl[i].modename; i++) {
4297 if (modeint == tbl[i].mode)
4298 return tbl[i].mode;
4299 if (strcmp(modestr, tbl[i].modename) == 0)
4300 return tbl[i].mode;
4301 }
4302
4303 return -1;
4304 }
4305
4306 static int bond_check_params(struct bond_params *params)
4307 {
4308 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4309 int arp_all_targets_value;
4310
4311 /*
4312 * Convert string parameters.
4313 */
4314 if (mode) {
4315 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4316 if (bond_mode == -1) {
4317 pr_err("Error: Invalid bonding mode \"%s\"\n",
4318 mode == NULL ? "NULL" : mode);
4319 return -EINVAL;
4320 }
4321 }
4322
4323 if (xmit_hash_policy) {
4324 if ((bond_mode != BOND_MODE_XOR) &&
4325 (bond_mode != BOND_MODE_8023AD)) {
4326 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4327 bond_mode_name(bond_mode));
4328 } else {
4329 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4330 xmit_hashtype_tbl);
4331 if (xmit_hashtype == -1) {
4332 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4333 xmit_hash_policy == NULL ? "NULL" :
4334 xmit_hash_policy);
4335 return -EINVAL;
4336 }
4337 }
4338 }
4339
4340 if (lacp_rate) {
4341 if (bond_mode != BOND_MODE_8023AD) {
4342 pr_info("lacp_rate param is irrelevant in mode %s\n",
4343 bond_mode_name(bond_mode));
4344 } else {
4345 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4346 if (lacp_fast == -1) {
4347 pr_err("Error: Invalid lacp rate \"%s\"\n",
4348 lacp_rate == NULL ? "NULL" : lacp_rate);
4349 return -EINVAL;
4350 }
4351 }
4352 }
4353
4354 if (ad_select) {
4355 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4356 if (params->ad_select == -1) {
4357 pr_err("Error: Invalid ad_select \"%s\"\n",
4358 ad_select == NULL ? "NULL" : ad_select);
4359 return -EINVAL;
4360 }
4361
4362 if (bond_mode != BOND_MODE_8023AD) {
4363 pr_warning("ad_select param only affects 802.3ad mode\n");
4364 }
4365 } else {
4366 params->ad_select = BOND_AD_STABLE;
4367 }
4368
4369 if (max_bonds < 0) {
4370 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4371 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4372 max_bonds = BOND_DEFAULT_MAX_BONDS;
4373 }
4374
4375 if (miimon < 0) {
4376 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4377 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4378 miimon = BOND_LINK_MON_INTERV;
4379 }
4380
4381 if (updelay < 0) {
4382 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4383 updelay, INT_MAX);
4384 updelay = 0;
4385 }
4386
4387 if (downdelay < 0) {
4388 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4389 downdelay, INT_MAX);
4390 downdelay = 0;
4391 }
4392
4393 if ((use_carrier != 0) && (use_carrier != 1)) {
4394 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4395 use_carrier);
4396 use_carrier = 1;
4397 }
4398
4399 if (num_peer_notif < 0 || num_peer_notif > 255) {
4400 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4401 num_peer_notif);
4402 num_peer_notif = 1;
4403 }
4404
4405 /* reset values for 802.3ad */
4406 if (bond_mode == BOND_MODE_8023AD) {
4407 if (!miimon) {
4408 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4409 pr_warning("Forcing miimon to 100msec\n");
4410 miimon = 100;
4411 }
4412 }
4413
4414 if (tx_queues < 1 || tx_queues > 255) {
4415 pr_warning("Warning: tx_queues (%d) should be between "
4416 "1 and 255, resetting to %d\n",
4417 tx_queues, BOND_DEFAULT_TX_QUEUES);
4418 tx_queues = BOND_DEFAULT_TX_QUEUES;
4419 }
4420
4421 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4422 pr_warning("Warning: all_slaves_active module parameter (%d), "
4423 "not of valid value (0/1), so it was set to "
4424 "0\n", all_slaves_active);
4425 all_slaves_active = 0;
4426 }
4427
4428 if (resend_igmp < 0 || resend_igmp > 255) {
4429 pr_warning("Warning: resend_igmp (%d) should be between "
4430 "0 and 255, resetting to %d\n",
4431 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4432 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4433 }
4434
4435 /* reset values for TLB/ALB */
4436 if ((bond_mode == BOND_MODE_TLB) ||
4437 (bond_mode == BOND_MODE_ALB)) {
4438 if (!miimon) {
4439 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure and link speed which are essential for TLB/ALB load balancing\n");
4440 pr_warning("Forcing miimon to 100msec\n");
4441 miimon = 100;
4442 }
4443 }
4444
4445 if (bond_mode == BOND_MODE_ALB) {
4446 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",
4447 updelay);
4448 }
4449
4450 if (!miimon) {
4451 if (updelay || downdelay) {
4452 /* just warn the user the up/down delay will have
4453 * no effect since miimon is zero...
4454 */
4455 pr_warning("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",
4456 updelay, downdelay);
4457 }
4458 } else {
4459 /* don't allow arp monitoring */
4460 if (arp_interval) {
4461 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4462 miimon, arp_interval);
4463 arp_interval = 0;
4464 }
4465
4466 if ((updelay % miimon) != 0) {
4467 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4468 updelay, miimon,
4469 (updelay / miimon) * miimon);
4470 }
4471
4472 updelay /= miimon;
4473
4474 if ((downdelay % miimon) != 0) {
4475 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4476 downdelay, miimon,
4477 (downdelay / miimon) * miimon);
4478 }
4479
4480 downdelay /= miimon;
4481 }
4482
4483 if (arp_interval < 0) {
4484 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4485 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4486 arp_interval = BOND_LINK_ARP_INTERV;
4487 }
4488
4489 for (arp_ip_count = 0, i = 0;
4490 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4491 /* not complete check, but should be good enough to
4492 catch mistakes */
4493 __be32 ip = in_aton(arp_ip_target[i]);
4494 if (!isdigit(arp_ip_target[i][0]) || ip == 0 ||
4495 ip == htonl(INADDR_BROADCAST)) {
4496 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4497 arp_ip_target[i]);
4498 arp_interval = 0;
4499 } else {
4500 if (bond_get_targets_ip(arp_target, ip) == -1)
4501 arp_target[arp_ip_count++] = ip;
4502 else
4503 pr_warning("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4504 &ip);
4505 }
4506 }
4507
4508 if (arp_interval && !arp_ip_count) {
4509 /* don't allow arping if no arp_ip_target given... */
4510 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4511 arp_interval);
4512 arp_interval = 0;
4513 }
4514
4515 if (arp_validate) {
4516 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4517 pr_err("arp_validate only supported in active-backup mode\n");
4518 return -EINVAL;
4519 }
4520 if (!arp_interval) {
4521 pr_err("arp_validate requires arp_interval\n");
4522 return -EINVAL;
4523 }
4524
4525 arp_validate_value = bond_parse_parm(arp_validate,
4526 arp_validate_tbl);
4527 if (arp_validate_value == -1) {
4528 pr_err("Error: invalid arp_validate \"%s\"\n",
4529 arp_validate == NULL ? "NULL" : arp_validate);
4530 return -EINVAL;
4531 }
4532 } else
4533 arp_validate_value = 0;
4534
4535 arp_all_targets_value = 0;
4536 if (arp_all_targets) {
4537 arp_all_targets_value = bond_parse_parm(arp_all_targets,
4538 arp_all_targets_tbl);
4539
4540 if (arp_all_targets_value == -1) {
4541 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4542 arp_all_targets);
4543 arp_all_targets_value = 0;
4544 }
4545 }
4546
4547 if (miimon) {
4548 pr_info("MII link monitoring set to %d ms\n", miimon);
4549 } else if (arp_interval) {
4550 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4551 arp_interval,
4552 arp_validate_tbl[arp_validate_value].modename,
4553 arp_ip_count);
4554
4555 for (i = 0; i < arp_ip_count; i++)
4556 pr_info(" %s", arp_ip_target[i]);
4557
4558 pr_info("\n");
4559
4560 } else if (max_bonds) {
4561 /* miimon and arp_interval not set, we need one so things
4562 * work as expected, see bonding.txt for details
4563 */
4564 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");
4565 }
4566
4567 if (primary && !USES_PRIMARY(bond_mode)) {
4568 /* currently, using a primary only makes sense
4569 * in active backup, TLB or ALB modes
4570 */
4571 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4572 primary, bond_mode_name(bond_mode));
4573 primary = NULL;
4574 }
4575
4576 if (primary && primary_reselect) {
4577 primary_reselect_value = bond_parse_parm(primary_reselect,
4578 pri_reselect_tbl);
4579 if (primary_reselect_value == -1) {
4580 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4581 primary_reselect ==
4582 NULL ? "NULL" : primary_reselect);
4583 return -EINVAL;
4584 }
4585 } else {
4586 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4587 }
4588
4589 if (fail_over_mac) {
4590 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4591 fail_over_mac_tbl);
4592 if (fail_over_mac_value == -1) {
4593 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4594 arp_validate == NULL ? "NULL" : arp_validate);
4595 return -EINVAL;
4596 }
4597
4598 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4599 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4600 } else {
4601 fail_over_mac_value = BOND_FOM_NONE;
4602 }
4603
4604 /* fill params struct with the proper values */
4605 params->mode = bond_mode;
4606 params->xmit_policy = xmit_hashtype;
4607 params->miimon = miimon;
4608 params->num_peer_notif = num_peer_notif;
4609 params->arp_interval = arp_interval;
4610 params->arp_validate = arp_validate_value;
4611 params->arp_all_targets = arp_all_targets_value;
4612 params->updelay = updelay;
4613 params->downdelay = downdelay;
4614 params->use_carrier = use_carrier;
4615 params->lacp_fast = lacp_fast;
4616 params->primary[0] = 0;
4617 params->primary_reselect = primary_reselect_value;
4618 params->fail_over_mac = fail_over_mac_value;
4619 params->tx_queues = tx_queues;
4620 params->all_slaves_active = all_slaves_active;
4621 params->resend_igmp = resend_igmp;
4622 params->min_links = min_links;
4623
4624 if (primary) {
4625 strncpy(params->primary, primary, IFNAMSIZ);
4626 params->primary[IFNAMSIZ - 1] = 0;
4627 }
4628
4629 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4630
4631 return 0;
4632 }
4633
4634 static struct lock_class_key bonding_netdev_xmit_lock_key;
4635 static struct lock_class_key bonding_netdev_addr_lock_key;
4636 static struct lock_class_key bonding_tx_busylock_key;
4637
4638 static void bond_set_lockdep_class_one(struct net_device *dev,
4639 struct netdev_queue *txq,
4640 void *_unused)
4641 {
4642 lockdep_set_class(&txq->_xmit_lock,
4643 &bonding_netdev_xmit_lock_key);
4644 }
4645
4646 static void bond_set_lockdep_class(struct net_device *dev)
4647 {
4648 lockdep_set_class(&dev->addr_list_lock,
4649 &bonding_netdev_addr_lock_key);
4650 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4651 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4652 }
4653
4654 /*
4655 * Called from registration process
4656 */
4657 static int bond_init(struct net_device *bond_dev)
4658 {
4659 struct bonding *bond = netdev_priv(bond_dev);
4660 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4661 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4662
4663 pr_debug("Begin bond_init for %s\n", bond_dev->name);
4664
4665 /*
4666 * Initialize locks that may be required during
4667 * en/deslave operations. All of the bond_open work
4668 * (of which this is part) should really be moved to
4669 * a phase prior to dev_open
4670 */
4671 spin_lock_init(&(bond_info->tx_hashtbl_lock));
4672 spin_lock_init(&(bond_info->rx_hashtbl_lock));
4673
4674 bond->wq = create_singlethread_workqueue(bond_dev->name);
4675 if (!bond->wq)
4676 return -ENOMEM;
4677
4678 bond_set_lockdep_class(bond_dev);
4679
4680 list_add_tail(&bond->bond_list, &bn->dev_list);
4681
4682 bond_prepare_sysfs_group(bond);
4683
4684 bond_debug_register(bond);
4685
4686 /* Ensure valid dev_addr */
4687 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4688 bond_dev->addr_assign_type == NET_ADDR_PERM)
4689 eth_hw_addr_random(bond_dev);
4690
4691 return 0;
4692 }
4693
4694 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4695 {
4696 if (tb[IFLA_ADDRESS]) {
4697 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4698 return -EINVAL;
4699 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4700 return -EADDRNOTAVAIL;
4701 }
4702 return 0;
4703 }
4704
4705 static unsigned int bond_get_num_tx_queues(void)
4706 {
4707 return tx_queues;
4708 }
4709
4710 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4711 .kind = "bond",
4712 .priv_size = sizeof(struct bonding),
4713 .setup = bond_setup,
4714 .validate = bond_validate,
4715 .get_num_tx_queues = bond_get_num_tx_queues,
4716 .get_num_rx_queues = bond_get_num_tx_queues, /* Use the same number
4717 as for TX queues */
4718 };
4719
4720 /* Create a new bond based on the specified name and bonding parameters.
4721 * If name is NULL, obtain a suitable "bond%d" name for us.
4722 * Caller must NOT hold rtnl_lock; we need to release it here before we
4723 * set up our sysfs entries.
4724 */
4725 int bond_create(struct net *net, const char *name)
4726 {
4727 struct net_device *bond_dev;
4728 int res;
4729
4730 rtnl_lock();
4731
4732 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4733 name ? name : "bond%d",
4734 bond_setup, tx_queues);
4735 if (!bond_dev) {
4736 pr_err("%s: eek! can't alloc netdev!\n", name);
4737 rtnl_unlock();
4738 return -ENOMEM;
4739 }
4740
4741 dev_net_set(bond_dev, net);
4742 bond_dev->rtnl_link_ops = &bond_link_ops;
4743
4744 res = register_netdevice(bond_dev);
4745
4746 netif_carrier_off(bond_dev);
4747
4748 rtnl_unlock();
4749 if (res < 0)
4750 bond_destructor(bond_dev);
4751 return res;
4752 }
4753
4754 static int __net_init bond_net_init(struct net *net)
4755 {
4756 struct bond_net *bn = net_generic(net, bond_net_id);
4757
4758 bn->net = net;
4759 INIT_LIST_HEAD(&bn->dev_list);
4760
4761 bond_create_proc_dir(bn);
4762 bond_create_sysfs(bn);
4763
4764 return 0;
4765 }
4766
4767 static void __net_exit bond_net_exit(struct net *net)
4768 {
4769 struct bond_net *bn = net_generic(net, bond_net_id);
4770 struct bonding *bond, *tmp_bond;
4771 LIST_HEAD(list);
4772
4773 bond_destroy_sysfs(bn);
4774 bond_destroy_proc_dir(bn);
4775
4776 /* Kill off any bonds created after unregistering bond rtnl ops */
4777 rtnl_lock();
4778 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4779 unregister_netdevice_queue(bond->dev, &list);
4780 unregister_netdevice_many(&list);
4781 rtnl_unlock();
4782 }
4783
4784 static struct pernet_operations bond_net_ops = {
4785 .init = bond_net_init,
4786 .exit = bond_net_exit,
4787 .id = &bond_net_id,
4788 .size = sizeof(struct bond_net),
4789 };
4790
4791 static int __init bonding_init(void)
4792 {
4793 int i;
4794 int res;
4795
4796 pr_info("%s", bond_version);
4797
4798 res = bond_check_params(&bonding_defaults);
4799 if (res)
4800 goto out;
4801
4802 res = register_pernet_subsys(&bond_net_ops);
4803 if (res)
4804 goto out;
4805
4806 res = rtnl_link_register(&bond_link_ops);
4807 if (res)
4808 goto err_link;
4809
4810 bond_create_debugfs();
4811
4812 for (i = 0; i < max_bonds; i++) {
4813 res = bond_create(&init_net, NULL);
4814 if (res)
4815 goto err;
4816 }
4817
4818 register_netdevice_notifier(&bond_netdev_notifier);
4819 out:
4820 return res;
4821 err:
4822 rtnl_link_unregister(&bond_link_ops);
4823 err_link:
4824 unregister_pernet_subsys(&bond_net_ops);
4825 goto out;
4826
4827 }
4828
4829 static void __exit bonding_exit(void)
4830 {
4831 unregister_netdevice_notifier(&bond_netdev_notifier);
4832
4833 bond_destroy_debugfs();
4834
4835 rtnl_link_unregister(&bond_link_ops);
4836 unregister_pernet_subsys(&bond_net_ops);
4837
4838 #ifdef CONFIG_NET_POLL_CONTROLLER
4839 /*
4840 * Make sure we don't have an imbalance on our netpoll blocking
4841 */
4842 WARN_ON(atomic_read(&netpoll_block_tx));
4843 #endif
4844 }
4845
4846 module_init(bonding_init);
4847 module_exit(bonding_exit);
4848 MODULE_LICENSE("GPL");
4849 MODULE_VERSION(DRV_VERSION);
4850 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4851 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4852 MODULE_ALIAS_RTNL_LINK("bond");
Linux kernel - Deliverables
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