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Merge branch 'for-3.11' of git://linux-nfs.org/~bfields/linux
[linux-2.6.git] / drivers / net / bonding / bond_main.c
blob07f257d44a1e00a67b84a58685c5a2e490ce5ca8
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 = 0;
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 < 0 || 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, *stop_at;
445 int i, res;
446
447 bond_for_each_slave(bond, slave, i) {
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 stop_at = slave;
465 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at)
466 vlan_vid_del(slave->dev, proto, vid);
467
468 return res;
469 }
470
471 /**
472 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
473 * @bond_dev: bonding net device that got called
474 * @vid: vlan id being removed
475 */
476 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
477 __be16 proto, u16 vid)
478 {
479 struct bonding *bond = netdev_priv(bond_dev);
480 struct slave *slave;
481 int i, res;
482
483 bond_for_each_slave(bond, slave, i)
484 vlan_vid_del(slave->dev, proto, vid);
485
486 res = bond_del_vlan(bond, vid);
487 if (res) {
488 pr_err("%s: Error: Failed to remove vlan id %d\n",
489 bond_dev->name, vid);
490 return res;
491 }
492
493 return 0;
494 }
495
496 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
497 {
498 struct vlan_entry *vlan;
499 int res;
500
501 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
502 res = vlan_vid_add(slave_dev, htons(ETH_P_8021Q),
503 vlan->vlan_id);
504 if (res)
505 pr_warning("%s: Failed to add vlan id %d to device %s\n",
506 bond->dev->name, vlan->vlan_id,
507 slave_dev->name);
508 }
509 }
510
511 static void bond_del_vlans_from_slave(struct bonding *bond,
512 struct net_device *slave_dev)
513 {
514 struct vlan_entry *vlan;
515
516 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
517 if (!vlan->vlan_id)
518 continue;
519 vlan_vid_del(slave_dev, htons(ETH_P_8021Q), vlan->vlan_id);
520 }
521 }
522
523 /*------------------------------- Link status -------------------------------*/
524
525 /*
526 * Set the carrier state for the master according to the state of its
527 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
528 * do special 802.3ad magic.
529 *
530 * Returns zero if carrier state does not change, nonzero if it does.
531 */
532 static int bond_set_carrier(struct bonding *bond)
533 {
534 struct slave *slave;
535 int i;
536
537 if (bond->slave_cnt == 0)
538 goto down;
539
540 if (bond->params.mode == BOND_MODE_8023AD)
541 return bond_3ad_set_carrier(bond);
542
543 bond_for_each_slave(bond, slave, i) {
544 if (slave->link == BOND_LINK_UP) {
545 if (!netif_carrier_ok(bond->dev)) {
546 netif_carrier_on(bond->dev);
547 return 1;
548 }
549 return 0;
550 }
551 }
552
553 down:
554 if (netif_carrier_ok(bond->dev)) {
555 netif_carrier_off(bond->dev);
556 return 1;
557 }
558 return 0;
559 }
560
561 /*
562 * Get link speed and duplex from the slave's base driver
563 * using ethtool. If for some reason the call fails or the
564 * values are invalid, set speed and duplex to -1,
565 * and return.
566 */
567 static void bond_update_speed_duplex(struct slave *slave)
568 {
569 struct net_device *slave_dev = slave->dev;
570 struct ethtool_cmd ecmd;
571 u32 slave_speed;
572 int res;
573
574 slave->speed = SPEED_UNKNOWN;
575 slave->duplex = DUPLEX_UNKNOWN;
576
577 res = __ethtool_get_settings(slave_dev, &ecmd);
578 if (res < 0)
579 return;
580
581 slave_speed = ethtool_cmd_speed(&ecmd);
582 if (slave_speed == 0 || slave_speed == ((__u32) -1))
583 return;
584
585 switch (ecmd.duplex) {
586 case DUPLEX_FULL:
587 case DUPLEX_HALF:
588 break;
589 default:
590 return;
591 }
592
593 slave->speed = slave_speed;
594 slave->duplex = ecmd.duplex;
595
596 return;
597 }
598
599 /*
600 * if <dev> supports MII link status reporting, check its link status.
601 *
602 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
603 * depending upon the setting of the use_carrier parameter.
604 *
605 * Return either BMSR_LSTATUS, meaning that the link is up (or we
606 * can't tell and just pretend it is), or 0, meaning that the link is
607 * down.
608 *
609 * If reporting is non-zero, instead of faking link up, return -1 if
610 * both ETHTOOL and MII ioctls fail (meaning the device does not
611 * support them). If use_carrier is set, return whatever it says.
612 * It'd be nice if there was a good way to tell if a driver supports
613 * netif_carrier, but there really isn't.
614 */
615 static int bond_check_dev_link(struct bonding *bond,
616 struct net_device *slave_dev, int reporting)
617 {
618 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
619 int (*ioctl)(struct net_device *, struct ifreq *, int);
620 struct ifreq ifr;
621 struct mii_ioctl_data *mii;
622
623 if (!reporting && !netif_running(slave_dev))
624 return 0;
625
626 if (bond->params.use_carrier)
627 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
628
629 /* Try to get link status using Ethtool first. */
630 if (slave_dev->ethtool_ops->get_link)
631 return slave_dev->ethtool_ops->get_link(slave_dev) ?
632 BMSR_LSTATUS : 0;
633
634 /* Ethtool can't be used, fallback to MII ioctls. */
635 ioctl = slave_ops->ndo_do_ioctl;
636 if (ioctl) {
637 /* TODO: set pointer to correct ioctl on a per team member */
638 /* bases to make this more efficient. that is, once */
639 /* we determine the correct ioctl, we will always */
640 /* call it and not the others for that team */
641 /* member. */
642
643 /*
644 * We cannot assume that SIOCGMIIPHY will also read a
645 * register; not all network drivers (e.g., e100)
646 * support that.
647 */
648
649 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
650 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
651 mii = if_mii(&ifr);
652 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
653 mii->reg_num = MII_BMSR;
654 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
655 return mii->val_out & BMSR_LSTATUS;
656 }
657 }
658
659 /*
660 * If reporting, report that either there's no dev->do_ioctl,
661 * or both SIOCGMIIREG and get_link failed (meaning that we
662 * cannot report link status). If not reporting, pretend
663 * we're ok.
664 */
665 return reporting ? -1 : BMSR_LSTATUS;
666 }
667
668 /*----------------------------- Multicast list ------------------------------*/
669
670 /*
671 * Push the promiscuity flag down to appropriate slaves
672 */
673 static int bond_set_promiscuity(struct bonding *bond, int inc)
674 {
675 int err = 0;
676 if (USES_PRIMARY(bond->params.mode)) {
677 /* write lock already acquired */
678 if (bond->curr_active_slave) {
679 err = dev_set_promiscuity(bond->curr_active_slave->dev,
680 inc);
681 }
682 } else {
683 struct slave *slave;
684 int i;
685 bond_for_each_slave(bond, slave, i) {
686 err = dev_set_promiscuity(slave->dev, inc);
687 if (err)
688 return err;
689 }
690 }
691 return err;
692 }
693
694 /*
695 * Push the allmulti flag down to all slaves
696 */
697 static int bond_set_allmulti(struct bonding *bond, int inc)
698 {
699 int err = 0;
700 if (USES_PRIMARY(bond->params.mode)) {
701 /* write lock already acquired */
702 if (bond->curr_active_slave) {
703 err = dev_set_allmulti(bond->curr_active_slave->dev,
704 inc);
705 }
706 } else {
707 struct slave *slave;
708 int i;
709 bond_for_each_slave(bond, slave, i) {
710 err = dev_set_allmulti(slave->dev, inc);
711 if (err)
712 return err;
713 }
714 }
715 return err;
716 }
717
718 static void __bond_resend_igmp_join_requests(struct net_device *dev)
719 {
720 struct in_device *in_dev;
721
722 in_dev = __in_dev_get_rcu(dev);
723 if (in_dev)
724 ip_mc_rejoin_groups(in_dev);
725 }
726
727 /*
728 * Retrieve the list of registered multicast addresses for the bonding
729 * device and retransmit an IGMP JOIN request to the current active
730 * slave.
731 */
732 static void bond_resend_igmp_join_requests(struct bonding *bond)
733 {
734 struct net_device *bond_dev, *vlan_dev, *upper_dev;
735 struct vlan_entry *vlan;
736
737 read_lock(&bond->lock);
738 rcu_read_lock();
739
740 bond_dev = bond->dev;
741
742 /* rejoin all groups on bond device */
743 __bond_resend_igmp_join_requests(bond_dev);
744
745 /*
746 * if bond is enslaved to a bridge,
747 * then rejoin all groups on its master
748 */
749 upper_dev = netdev_master_upper_dev_get_rcu(bond_dev);
750 if (upper_dev && upper_dev->priv_flags & IFF_EBRIDGE)
751 __bond_resend_igmp_join_requests(upper_dev);
752
753 /* rejoin all groups on vlan devices */
754 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
755 vlan_dev = __vlan_find_dev_deep(bond_dev, htons(ETH_P_8021Q),
756 vlan->vlan_id);
757 if (vlan_dev)
758 __bond_resend_igmp_join_requests(vlan_dev);
759 }
760 rcu_read_unlock();
761
762 /* We use curr_slave_lock to protect against concurrent access to
763 * igmp_retrans from multiple running instances of this function and
764 * bond_change_active_slave
765 */
766 write_lock_bh(&bond->curr_slave_lock);
767 if (bond->igmp_retrans > 1) {
768 bond->igmp_retrans--;
769 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
770 }
771 write_unlock_bh(&bond->curr_slave_lock);
772 read_unlock(&bond->lock);
773 }
774
775 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
776 {
777 struct bonding *bond = container_of(work, struct bonding,
778 mcast_work.work);
779
780 bond_resend_igmp_join_requests(bond);
781 }
782
783 /* Flush bond's hardware addresses from slave
784 */
785 static void bond_hw_addr_flush(struct net_device *bond_dev,
786 struct net_device *slave_dev)
787 {
788 struct bonding *bond = netdev_priv(bond_dev);
789
790 dev_uc_unsync(slave_dev, bond_dev);
791 dev_mc_unsync(slave_dev, bond_dev);
792
793 if (bond->params.mode == BOND_MODE_8023AD) {
794 /* del lacpdu mc addr from mc list */
795 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
796
797 dev_mc_del(slave_dev, lacpdu_multicast);
798 }
799 }
800
801 /*--------------------------- Active slave change ---------------------------*/
802
803 /* Update the hardware address list and promisc/allmulti for the new and
804 * old active slaves (if any). Modes that are !USES_PRIMARY keep all
805 * slaves up date at all times; only the USES_PRIMARY modes need to call
806 * this function to swap these settings during a failover.
807 */
808 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
809 struct slave *old_active)
810 {
811 if (old_active) {
812 if (bond->dev->flags & IFF_PROMISC)
813 dev_set_promiscuity(old_active->dev, -1);
814
815 if (bond->dev->flags & IFF_ALLMULTI)
816 dev_set_allmulti(old_active->dev, -1);
817
818 bond_hw_addr_flush(bond->dev, old_active->dev);
819 }
820
821 if (new_active) {
822 /* FIXME: Signal errors upstream. */
823 if (bond->dev->flags & IFF_PROMISC)
824 dev_set_promiscuity(new_active->dev, 1);
825
826 if (bond->dev->flags & IFF_ALLMULTI)
827 dev_set_allmulti(new_active->dev, 1);
828
829 netif_addr_lock_bh(bond->dev);
830 dev_uc_sync(new_active->dev, bond->dev);
831 dev_mc_sync(new_active->dev, bond->dev);
832 netif_addr_unlock_bh(bond->dev);
833 }
834 }
835
836 /**
837 * bond_set_dev_addr - clone slave's address to bond
838 * @bond_dev: bond net device
839 * @slave_dev: slave net device
840 *
841 * Should be called with RTNL held.
842 */
843 static void bond_set_dev_addr(struct net_device *bond_dev,
844 struct net_device *slave_dev)
845 {
846 pr_debug("bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
847 bond_dev, slave_dev, slave_dev->addr_len);
848 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
849 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
850 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
851 }
852
853 /*
854 * bond_do_fail_over_mac
855 *
856 * Perform special MAC address swapping for fail_over_mac settings
857 *
858 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
859 */
860 static void bond_do_fail_over_mac(struct bonding *bond,
861 struct slave *new_active,
862 struct slave *old_active)
863 __releases(&bond->curr_slave_lock)
864 __releases(&bond->lock)
865 __acquires(&bond->lock)
866 __acquires(&bond->curr_slave_lock)
867 {
868 u8 tmp_mac[ETH_ALEN];
869 struct sockaddr saddr;
870 int rv;
871
872 switch (bond->params.fail_over_mac) {
873 case BOND_FOM_ACTIVE:
874 if (new_active) {
875 write_unlock_bh(&bond->curr_slave_lock);
876 read_unlock(&bond->lock);
877 bond_set_dev_addr(bond->dev, new_active->dev);
878 read_lock(&bond->lock);
879 write_lock_bh(&bond->curr_slave_lock);
880 }
881 break;
882 case BOND_FOM_FOLLOW:
883 /*
884 * if new_active && old_active, swap them
885 * if just old_active, do nothing (going to no active slave)
886 * if just new_active, set new_active to bond's MAC
887 */
888 if (!new_active)
889 return;
890
891 write_unlock_bh(&bond->curr_slave_lock);
892 read_unlock(&bond->lock);
893
894 if (old_active) {
895 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
896 memcpy(saddr.sa_data, old_active->dev->dev_addr,
897 ETH_ALEN);
898 saddr.sa_family = new_active->dev->type;
899 } else {
900 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
901 saddr.sa_family = bond->dev->type;
902 }
903
904 rv = dev_set_mac_address(new_active->dev, &saddr);
905 if (rv) {
906 pr_err("%s: Error %d setting MAC of slave %s\n",
907 bond->dev->name, -rv, new_active->dev->name);
908 goto out;
909 }
910
911 if (!old_active)
912 goto out;
913
914 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
915 saddr.sa_family = old_active->dev->type;
916
917 rv = dev_set_mac_address(old_active->dev, &saddr);
918 if (rv)
919 pr_err("%s: Error %d setting MAC of slave %s\n",
920 bond->dev->name, -rv, new_active->dev->name);
921 out:
922 read_lock(&bond->lock);
923 write_lock_bh(&bond->curr_slave_lock);
924 break;
925 default:
926 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
927 bond->dev->name, bond->params.fail_over_mac);
928 break;
929 }
930
931 }
932
933 static bool bond_should_change_active(struct bonding *bond)
934 {
935 struct slave *prim = bond->primary_slave;
936 struct slave *curr = bond->curr_active_slave;
937
938 if (!prim || !curr || curr->link != BOND_LINK_UP)
939 return true;
940 if (bond->force_primary) {
941 bond->force_primary = false;
942 return true;
943 }
944 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
945 (prim->speed < curr->speed ||
946 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
947 return false;
948 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
949 return false;
950 return true;
951 }
952
953 /**
954 * find_best_interface - select the best available slave to be the active one
955 * @bond: our bonding struct
956 *
957 * Warning: Caller must hold curr_slave_lock for writing.
958 */
959 static struct slave *bond_find_best_slave(struct bonding *bond)
960 {
961 struct slave *new_active, *old_active;
962 struct slave *bestslave = NULL;
963 int mintime = bond->params.updelay;
964 int i;
965
966 new_active = bond->curr_active_slave;
967
968 if (!new_active) { /* there were no active slaves left */
969 if (bond->slave_cnt > 0) /* found one slave */
970 new_active = bond->first_slave;
971 else
972 return NULL; /* still no slave, return NULL */
973 }
974
975 if ((bond->primary_slave) &&
976 bond->primary_slave->link == BOND_LINK_UP &&
977 bond_should_change_active(bond)) {
978 new_active = bond->primary_slave;
979 }
980
981 /* remember where to stop iterating over the slaves */
982 old_active = new_active;
983
984 bond_for_each_slave_from(bond, new_active, i, old_active) {
985 if (new_active->link == BOND_LINK_UP) {
986 return new_active;
987 } else if (new_active->link == BOND_LINK_BACK &&
988 IS_UP(new_active->dev)) {
989 /* link up, but waiting for stabilization */
990 if (new_active->delay < mintime) {
991 mintime = new_active->delay;
992 bestslave = new_active;
993 }
994 }
995 }
996
997 return bestslave;
998 }
999
1000 static bool bond_should_notify_peers(struct bonding *bond)
1001 {
1002 struct slave *slave = bond->curr_active_slave;
1003
1004 pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1005 bond->dev->name, slave ? slave->dev->name : "NULL");
1006
1007 if (!slave || !bond->send_peer_notif ||
1008 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1009 return false;
1010
1011 bond->send_peer_notif--;
1012 return true;
1013 }
1014
1015 /**
1016 * change_active_interface - change the active slave into the specified one
1017 * @bond: our bonding struct
1018 * @new: the new slave to make the active one
1019 *
1020 * Set the new slave to the bond's settings and unset them on the old
1021 * curr_active_slave.
1022 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1023 *
1024 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1025 * because it is apparently the best available slave we have, even though its
1026 * updelay hasn't timed out yet.
1027 *
1028 * If new_active is not NULL, caller must hold bond->lock for read and
1029 * curr_slave_lock for write_bh.
1030 */
1031 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1032 {
1033 struct slave *old_active = bond->curr_active_slave;
1034
1035 if (old_active == new_active)
1036 return;
1037
1038 if (new_active) {
1039 new_active->jiffies = jiffies;
1040
1041 if (new_active->link == BOND_LINK_BACK) {
1042 if (USES_PRIMARY(bond->params.mode)) {
1043 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1044 bond->dev->name, new_active->dev->name,
1045 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1046 }
1047
1048 new_active->delay = 0;
1049 new_active->link = BOND_LINK_UP;
1050
1051 if (bond->params.mode == BOND_MODE_8023AD)
1052 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1053
1054 if (bond_is_lb(bond))
1055 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1056 } else {
1057 if (USES_PRIMARY(bond->params.mode)) {
1058 pr_info("%s: making interface %s the new active one.\n",
1059 bond->dev->name, new_active->dev->name);
1060 }
1061 }
1062 }
1063
1064 if (USES_PRIMARY(bond->params.mode))
1065 bond_hw_addr_swap(bond, new_active, old_active);
1066
1067 if (bond_is_lb(bond)) {
1068 bond_alb_handle_active_change(bond, new_active);
1069 if (old_active)
1070 bond_set_slave_inactive_flags(old_active);
1071 if (new_active)
1072 bond_set_slave_active_flags(new_active);
1073 } else {
1074 bond->curr_active_slave = new_active;
1075 }
1076
1077 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1078 if (old_active)
1079 bond_set_slave_inactive_flags(old_active);
1080
1081 if (new_active) {
1082 bool should_notify_peers = false;
1083
1084 bond_set_slave_active_flags(new_active);
1085
1086 if (bond->params.fail_over_mac)
1087 bond_do_fail_over_mac(bond, new_active,
1088 old_active);
1089
1090 if (netif_running(bond->dev)) {
1091 bond->send_peer_notif =
1092 bond->params.num_peer_notif;
1093 should_notify_peers =
1094 bond_should_notify_peers(bond);
1095 }
1096
1097 write_unlock_bh(&bond->curr_slave_lock);
1098 read_unlock(&bond->lock);
1099
1100 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1101 if (should_notify_peers)
1102 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1103 bond->dev);
1104
1105 read_lock(&bond->lock);
1106 write_lock_bh(&bond->curr_slave_lock);
1107 }
1108 }
1109
1110 /* resend IGMP joins since active slave has changed or
1111 * all were sent on curr_active_slave.
1112 * resend only if bond is brought up with the affected
1113 * bonding modes and the retransmission is enabled */
1114 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1115 ((USES_PRIMARY(bond->params.mode) && new_active) ||
1116 bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1117 bond->igmp_retrans = bond->params.resend_igmp;
1118 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1119 }
1120 }
1121
1122 /**
1123 * bond_select_active_slave - select a new active slave, if needed
1124 * @bond: our bonding struct
1125 *
1126 * This functions should be called when one of the following occurs:
1127 * - The old curr_active_slave has been released or lost its link.
1128 * - The primary_slave has got its link back.
1129 * - A slave has got its link back and there's no old curr_active_slave.
1130 *
1131 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1132 */
1133 void bond_select_active_slave(struct bonding *bond)
1134 {
1135 struct slave *best_slave;
1136 int rv;
1137
1138 best_slave = bond_find_best_slave(bond);
1139 if (best_slave != bond->curr_active_slave) {
1140 bond_change_active_slave(bond, best_slave);
1141 rv = bond_set_carrier(bond);
1142 if (!rv)
1143 return;
1144
1145 if (netif_carrier_ok(bond->dev)) {
1146 pr_info("%s: first active interface up!\n",
1147 bond->dev->name);
1148 } else {
1149 pr_info("%s: now running without any active interface !\n",
1150 bond->dev->name);
1151 }
1152 }
1153 }
1154
1155 /*--------------------------- slave list handling ---------------------------*/
1156
1157 /*
1158 * This function attaches the slave to the end of list.
1159 *
1160 * bond->lock held for writing by caller.
1161 */
1162 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1163 {
1164 if (bond->first_slave == NULL) { /* attaching the first slave */
1165 new_slave->next = new_slave;
1166 new_slave->prev = new_slave;
1167 bond->first_slave = new_slave;
1168 } else {
1169 new_slave->next = bond->first_slave;
1170 new_slave->prev = bond->first_slave->prev;
1171 new_slave->next->prev = new_slave;
1172 new_slave->prev->next = new_slave;
1173 }
1174
1175 bond->slave_cnt++;
1176 }
1177
1178 /*
1179 * This function detaches the slave from the list.
1180 * WARNING: no check is made to verify if the slave effectively
1181 * belongs to <bond>.
1182 * Nothing is freed on return, structures are just unchained.
1183 * If any slave pointer in bond was pointing to <slave>,
1184 * it should be changed by the calling function.
1185 *
1186 * bond->lock held for writing by caller.
1187 */
1188 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1189 {
1190 if (slave->next)
1191 slave->next->prev = slave->prev;
1192
1193 if (slave->prev)
1194 slave->prev->next = slave->next;
1195
1196 if (bond->first_slave == slave) { /* slave is the first slave */
1197 if (bond->slave_cnt > 1) { /* there are more slave */
1198 bond->first_slave = slave->next;
1199 } else {
1200 bond->first_slave = NULL; /* slave was the last one */
1201 }
1202 }
1203
1204 slave->next = NULL;
1205 slave->prev = NULL;
1206 bond->slave_cnt--;
1207 }
1208
1209 #ifdef CONFIG_NET_POLL_CONTROLLER
1210 static inline int slave_enable_netpoll(struct slave *slave)
1211 {
1212 struct netpoll *np;
1213 int err = 0;
1214
1215 np = kzalloc(sizeof(*np), GFP_ATOMIC);
1216 err = -ENOMEM;
1217 if (!np)
1218 goto out;
1219
1220 err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
1221 if (err) {
1222 kfree(np);
1223 goto out;
1224 }
1225 slave->np = np;
1226 out:
1227 return err;
1228 }
1229 static inline void slave_disable_netpoll(struct slave *slave)
1230 {
1231 struct netpoll *np = slave->np;
1232
1233 if (!np)
1234 return;
1235
1236 slave->np = NULL;
1237 __netpoll_free_async(np);
1238 }
1239 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1240 {
1241 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1242 return false;
1243 if (!slave_dev->netdev_ops->ndo_poll_controller)
1244 return false;
1245 return true;
1246 }
1247
1248 static void bond_poll_controller(struct net_device *bond_dev)
1249 {
1250 }
1251
1252 static void __bond_netpoll_cleanup(struct bonding *bond)
1253 {
1254 struct slave *slave;
1255 int i;
1256
1257 bond_for_each_slave(bond, slave, i)
1258 if (IS_UP(slave->dev))
1259 slave_disable_netpoll(slave);
1260 }
1261 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1262 {
1263 struct bonding *bond = netdev_priv(bond_dev);
1264
1265 read_lock(&bond->lock);
1266 __bond_netpoll_cleanup(bond);
1267 read_unlock(&bond->lock);
1268 }
1269
1270 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
1271 {
1272 struct bonding *bond = netdev_priv(dev);
1273 struct slave *slave;
1274 int i, err = 0;
1275
1276 read_lock(&bond->lock);
1277 bond_for_each_slave(bond, slave, i) {
1278 err = slave_enable_netpoll(slave);
1279 if (err) {
1280 __bond_netpoll_cleanup(bond);
1281 break;
1282 }
1283 }
1284 read_unlock(&bond->lock);
1285 return err;
1286 }
1287
1288 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1289 {
1290 return bond->dev->npinfo;
1291 }
1292
1293 #else
1294 static inline int slave_enable_netpoll(struct slave *slave)
1295 {
1296 return 0;
1297 }
1298 static inline void slave_disable_netpoll(struct slave *slave)
1299 {
1300 }
1301 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1302 {
1303 }
1304 #endif
1305
1306 /*---------------------------------- IOCTL ----------------------------------*/
1307
1308 static netdev_features_t bond_fix_features(struct net_device *dev,
1309 netdev_features_t features)
1310 {
1311 struct slave *slave;
1312 struct bonding *bond = netdev_priv(dev);
1313 netdev_features_t mask;
1314 int i;
1315
1316 read_lock(&bond->lock);
1317
1318 if (!bond->first_slave) {
1319 /* Disable adding VLANs to empty bond. But why? --mq */
1320 features |= NETIF_F_VLAN_CHALLENGED;
1321 goto out;
1322 }
1323
1324 mask = features;
1325 features &= ~NETIF_F_ONE_FOR_ALL;
1326 features |= NETIF_F_ALL_FOR_ALL;
1327
1328 bond_for_each_slave(bond, slave, i) {
1329 features = netdev_increment_features(features,
1330 slave->dev->features,
1331 mask);
1332 }
1333 features = netdev_add_tso_features(features, mask);
1334
1335 out:
1336 read_unlock(&bond->lock);
1337 return features;
1338 }
1339
1340 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1341 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1342 NETIF_F_HIGHDMA | NETIF_F_LRO)
1343
1344 static void bond_compute_features(struct bonding *bond)
1345 {
1346 struct slave *slave;
1347 struct net_device *bond_dev = bond->dev;
1348 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1349 unsigned short max_hard_header_len = ETH_HLEN;
1350 unsigned int gso_max_size = GSO_MAX_SIZE;
1351 u16 gso_max_segs = GSO_MAX_SEGS;
1352 int i;
1353 unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1354
1355 read_lock(&bond->lock);
1356
1357 if (!bond->first_slave)
1358 goto done;
1359
1360 bond_for_each_slave(bond, slave, i) {
1361 vlan_features = netdev_increment_features(vlan_features,
1362 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1363
1364 dst_release_flag &= slave->dev->priv_flags;
1365 if (slave->dev->hard_header_len > max_hard_header_len)
1366 max_hard_header_len = slave->dev->hard_header_len;
1367
1368 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1369 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1370 }
1371
1372 done:
1373 bond_dev->vlan_features = vlan_features;
1374 bond_dev->hard_header_len = max_hard_header_len;
1375 bond_dev->gso_max_segs = gso_max_segs;
1376 netif_set_gso_max_size(bond_dev, gso_max_size);
1377
1378 flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1379 bond_dev->priv_flags = flags | dst_release_flag;
1380
1381 read_unlock(&bond->lock);
1382
1383 netdev_change_features(bond_dev);
1384 }
1385
1386 static void bond_setup_by_slave(struct net_device *bond_dev,
1387 struct net_device *slave_dev)
1388 {
1389 bond_dev->header_ops = slave_dev->header_ops;
1390
1391 bond_dev->type = slave_dev->type;
1392 bond_dev->hard_header_len = slave_dev->hard_header_len;
1393 bond_dev->addr_len = slave_dev->addr_len;
1394
1395 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1396 slave_dev->addr_len);
1397 }
1398
1399 /* On bonding slaves other than the currently active slave, suppress
1400 * duplicates except for alb non-mcast/bcast.
1401 */
1402 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1403 struct slave *slave,
1404 struct bonding *bond)
1405 {
1406 if (bond_is_slave_inactive(slave)) {
1407 if (bond->params.mode == BOND_MODE_ALB &&
1408 skb->pkt_type != PACKET_BROADCAST &&
1409 skb->pkt_type != PACKET_MULTICAST)
1410 return false;
1411 return true;
1412 }
1413 return false;
1414 }
1415
1416 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1417 {
1418 struct sk_buff *skb = *pskb;
1419 struct slave *slave;
1420 struct bonding *bond;
1421 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1422 struct slave *);
1423 int ret = RX_HANDLER_ANOTHER;
1424
1425 skb = skb_share_check(skb, GFP_ATOMIC);
1426 if (unlikely(!skb))
1427 return RX_HANDLER_CONSUMED;
1428
1429 *pskb = skb;
1430
1431 slave = bond_slave_get_rcu(skb->dev);
1432 bond = slave->bond;
1433
1434 if (bond->params.arp_interval)
1435 slave->dev->last_rx = jiffies;
1436
1437 recv_probe = ACCESS_ONCE(bond->recv_probe);
1438 if (recv_probe) {
1439 ret = recv_probe(skb, bond, slave);
1440 if (ret == RX_HANDLER_CONSUMED) {
1441 consume_skb(skb);
1442 return ret;
1443 }
1444 }
1445
1446 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1447 return RX_HANDLER_EXACT;
1448 }
1449
1450 skb->dev = bond->dev;
1451
1452 if (bond->params.mode == BOND_MODE_ALB &&
1453 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1454 skb->pkt_type == PACKET_HOST) {
1455
1456 if (unlikely(skb_cow_head(skb,
1457 skb->data - skb_mac_header(skb)))) {
1458 kfree_skb(skb);
1459 return RX_HANDLER_CONSUMED;
1460 }
1461 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1462 }
1463
1464 return ret;
1465 }
1466
1467 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1468 struct net_device *slave_dev)
1469 {
1470 int err;
1471
1472 err = netdev_master_upper_dev_link(slave_dev, bond_dev);
1473 if (err)
1474 return err;
1475 slave_dev->flags |= IFF_SLAVE;
1476 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1477 return 0;
1478 }
1479
1480 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1481 struct net_device *slave_dev)
1482 {
1483 netdev_upper_dev_unlink(slave_dev, bond_dev);
1484 slave_dev->flags &= ~IFF_SLAVE;
1485 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1486 }
1487
1488 /* enslave device <slave> to bond device <master> */
1489 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1490 {
1491 struct bonding *bond = netdev_priv(bond_dev);
1492 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1493 struct slave *new_slave = NULL;
1494 struct sockaddr addr;
1495 int link_reporting;
1496 int res = 0, i;
1497
1498 if (!bond->params.use_carrier &&
1499 slave_dev->ethtool_ops->get_link == NULL &&
1500 slave_ops->ndo_do_ioctl == NULL) {
1501 pr_warning("%s: Warning: no link monitoring support for %s\n",
1502 bond_dev->name, slave_dev->name);
1503 }
1504
1505 /* already enslaved */
1506 if (slave_dev->flags & IFF_SLAVE) {
1507 pr_debug("Error, Device was already enslaved\n");
1508 return -EBUSY;
1509 }
1510
1511 /* vlan challenged mutual exclusion */
1512 /* no need to lock since we're protected by rtnl_lock */
1513 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1514 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1515 if (vlan_uses_dev(bond_dev)) {
1516 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1517 bond_dev->name, slave_dev->name, bond_dev->name);
1518 return -EPERM;
1519 } else {
1520 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1521 bond_dev->name, slave_dev->name,
1522 slave_dev->name, bond_dev->name);
1523 }
1524 } else {
1525 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1526 }
1527
1528 /*
1529 * Old ifenslave binaries are no longer supported. These can
1530 * be identified with moderate accuracy by the state of the slave:
1531 * the current ifenslave will set the interface down prior to
1532 * enslaving it; the old ifenslave will not.
1533 */
1534 if ((slave_dev->flags & IFF_UP)) {
1535 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1536 slave_dev->name);
1537 res = -EPERM;
1538 goto err_undo_flags;
1539 }
1540
1541 /* set bonding device ether type by slave - bonding netdevices are
1542 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1543 * there is a need to override some of the type dependent attribs/funcs.
1544 *
1545 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1546 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1547 */
1548 if (bond->slave_cnt == 0) {
1549 if (bond_dev->type != slave_dev->type) {
1550 pr_debug("%s: change device type from %d to %d\n",
1551 bond_dev->name,
1552 bond_dev->type, slave_dev->type);
1553
1554 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1555 bond_dev);
1556 res = notifier_to_errno(res);
1557 if (res) {
1558 pr_err("%s: refused to change device type\n",
1559 bond_dev->name);
1560 res = -EBUSY;
1561 goto err_undo_flags;
1562 }
1563
1564 /* Flush unicast and multicast addresses */
1565 dev_uc_flush(bond_dev);
1566 dev_mc_flush(bond_dev);
1567
1568 if (slave_dev->type != ARPHRD_ETHER)
1569 bond_setup_by_slave(bond_dev, slave_dev);
1570 else {
1571 ether_setup(bond_dev);
1572 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1573 }
1574
1575 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1576 bond_dev);
1577 }
1578 } else if (bond_dev->type != slave_dev->type) {
1579 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1580 slave_dev->name,
1581 slave_dev->type, bond_dev->type);
1582 res = -EINVAL;
1583 goto err_undo_flags;
1584 }
1585
1586 if (slave_ops->ndo_set_mac_address == NULL) {
1587 if (bond->slave_cnt == 0) {
1588 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1589 bond_dev->name);
1590 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1591 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1592 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",
1593 bond_dev->name);
1594 res = -EOPNOTSUPP;
1595 goto err_undo_flags;
1596 }
1597 }
1598
1599 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1600
1601 /* If this is the first slave, then we need to set the master's hardware
1602 * address to be the same as the slave's. */
1603 if (!bond->slave_cnt && bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1604 bond_set_dev_addr(bond->dev, slave_dev);
1605
1606 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1607 if (!new_slave) {
1608 res = -ENOMEM;
1609 goto err_undo_flags;
1610 }
1611
1612 /*
1613 * Set the new_slave's queue_id to be zero. Queue ID mapping
1614 * is set via sysfs or module option if desired.
1615 */
1616 new_slave->queue_id = 0;
1617
1618 /* Save slave's original mtu and then set it to match the bond */
1619 new_slave->original_mtu = slave_dev->mtu;
1620 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1621 if (res) {
1622 pr_debug("Error %d calling dev_set_mtu\n", res);
1623 goto err_free;
1624 }
1625
1626 /*
1627 * Save slave's original ("permanent") mac address for modes
1628 * that need it, and for restoring it upon release, and then
1629 * set it to the master's address
1630 */
1631 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1632
1633 if (!bond->params.fail_over_mac) {
1634 /*
1635 * Set slave to master's mac address. The application already
1636 * set the master's mac address to that of the first slave
1637 */
1638 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1639 addr.sa_family = slave_dev->type;
1640 res = dev_set_mac_address(slave_dev, &addr);
1641 if (res) {
1642 pr_debug("Error %d calling set_mac_address\n", res);
1643 goto err_restore_mtu;
1644 }
1645 }
1646
1647 res = bond_master_upper_dev_link(bond_dev, slave_dev);
1648 if (res) {
1649 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1650 goto err_restore_mac;
1651 }
1652
1653 /* open the slave since the application closed it */
1654 res = dev_open(slave_dev);
1655 if (res) {
1656 pr_debug("Opening slave %s failed\n", slave_dev->name);
1657 goto err_unset_master;
1658 }
1659
1660 new_slave->bond = bond;
1661 new_slave->dev = slave_dev;
1662 slave_dev->priv_flags |= IFF_BONDING;
1663
1664 if (bond_is_lb(bond)) {
1665 /* bond_alb_init_slave() must be called before all other stages since
1666 * it might fail and we do not want to have to undo everything
1667 */
1668 res = bond_alb_init_slave(bond, new_slave);
1669 if (res)
1670 goto err_close;
1671 }
1672
1673 /* If the mode USES_PRIMARY, then the following is handled by
1674 * bond_change_active_slave().
1675 */
1676 if (!USES_PRIMARY(bond->params.mode)) {
1677 /* set promiscuity level to new slave */
1678 if (bond_dev->flags & IFF_PROMISC) {
1679 res = dev_set_promiscuity(slave_dev, 1);
1680 if (res)
1681 goto err_close;
1682 }
1683
1684 /* set allmulti level to new slave */
1685 if (bond_dev->flags & IFF_ALLMULTI) {
1686 res = dev_set_allmulti(slave_dev, 1);
1687 if (res)
1688 goto err_close;
1689 }
1690
1691 netif_addr_lock_bh(bond_dev);
1692
1693 dev_mc_sync_multiple(slave_dev, bond_dev);
1694 dev_uc_sync_multiple(slave_dev, bond_dev);
1695
1696 netif_addr_unlock_bh(bond_dev);
1697 }
1698
1699 if (bond->params.mode == BOND_MODE_8023AD) {
1700 /* add lacpdu mc addr to mc list */
1701 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1702
1703 dev_mc_add(slave_dev, lacpdu_multicast);
1704 }
1705
1706 bond_add_vlans_on_slave(bond, slave_dev);
1707
1708 write_lock_bh(&bond->lock);
1709
1710 bond_attach_slave(bond, new_slave);
1711
1712 new_slave->delay = 0;
1713 new_slave->link_failure_count = 0;
1714
1715 write_unlock_bh(&bond->lock);
1716
1717 bond_compute_features(bond);
1718
1719 bond_update_speed_duplex(new_slave);
1720
1721 read_lock(&bond->lock);
1722
1723 new_slave->last_arp_rx = jiffies -
1724 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1725 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1726 new_slave->target_last_arp_rx[i] = new_slave->last_arp_rx;
1727
1728 if (bond->params.miimon && !bond->params.use_carrier) {
1729 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1730
1731 if ((link_reporting == -1) && !bond->params.arp_interval) {
1732 /*
1733 * miimon is set but a bonded network driver
1734 * does not support ETHTOOL/MII and
1735 * arp_interval is not set. Note: if
1736 * use_carrier is enabled, we will never go
1737 * here (because netif_carrier is always
1738 * supported); thus, we don't need to change
1739 * the messages for netif_carrier.
1740 */
1741 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",
1742 bond_dev->name, slave_dev->name);
1743 } else if (link_reporting == -1) {
1744 /* unable get link status using mii/ethtool */
1745 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",
1746 bond_dev->name, slave_dev->name);
1747 }
1748 }
1749
1750 /* check for initial state */
1751 if (bond->params.miimon) {
1752 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1753 if (bond->params.updelay) {
1754 new_slave->link = BOND_LINK_BACK;
1755 new_slave->delay = bond->params.updelay;
1756 } else {
1757 new_slave->link = BOND_LINK_UP;
1758 }
1759 } else {
1760 new_slave->link = BOND_LINK_DOWN;
1761 }
1762 } else if (bond->params.arp_interval) {
1763 new_slave->link = (netif_carrier_ok(slave_dev) ?
1764 BOND_LINK_UP : BOND_LINK_DOWN);
1765 } else {
1766 new_slave->link = BOND_LINK_UP;
1767 }
1768
1769 if (new_slave->link != BOND_LINK_DOWN)
1770 new_slave->jiffies = jiffies;
1771 pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1772 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1773 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1774
1775 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1776 /* if there is a primary slave, remember it */
1777 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1778 bond->primary_slave = new_slave;
1779 bond->force_primary = true;
1780 }
1781 }
1782
1783 write_lock_bh(&bond->curr_slave_lock);
1784
1785 switch (bond->params.mode) {
1786 case BOND_MODE_ACTIVEBACKUP:
1787 bond_set_slave_inactive_flags(new_slave);
1788 bond_select_active_slave(bond);
1789 break;
1790 case BOND_MODE_8023AD:
1791 /* in 802.3ad mode, the internal mechanism
1792 * will activate the slaves in the selected
1793 * aggregator
1794 */
1795 bond_set_slave_inactive_flags(new_slave);
1796 /* if this is the first slave */
1797 if (bond->slave_cnt == 1) {
1798 SLAVE_AD_INFO(new_slave).id = 1;
1799 /* Initialize AD with the number of times that the AD timer is called in 1 second
1800 * can be called only after the mac address of the bond is set
1801 */
1802 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1803 } else {
1804 SLAVE_AD_INFO(new_slave).id =
1805 SLAVE_AD_INFO(new_slave->prev).id + 1;
1806 }
1807
1808 bond_3ad_bind_slave(new_slave);
1809 break;
1810 case BOND_MODE_TLB:
1811 case BOND_MODE_ALB:
1812 bond_set_active_slave(new_slave);
1813 bond_set_slave_inactive_flags(new_slave);
1814 bond_select_active_slave(bond);
1815 break;
1816 default:
1817 pr_debug("This slave is always active in trunk mode\n");
1818
1819 /* always active in trunk mode */
1820 bond_set_active_slave(new_slave);
1821
1822 /* In trunking mode there is little meaning to curr_active_slave
1823 * anyway (it holds no special properties of the bond device),
1824 * so we can change it without calling change_active_interface()
1825 */
1826 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1827 bond->curr_active_slave = new_slave;
1828
1829 break;
1830 } /* switch(bond_mode) */
1831
1832 write_unlock_bh(&bond->curr_slave_lock);
1833
1834 bond_set_carrier(bond);
1835
1836 #ifdef CONFIG_NET_POLL_CONTROLLER
1837 slave_dev->npinfo = bond_netpoll_info(bond);
1838 if (slave_dev->npinfo) {
1839 if (slave_enable_netpoll(new_slave)) {
1840 read_unlock(&bond->lock);
1841 pr_info("Error, %s: master_dev is using netpoll, "
1842 "but new slave device does not support netpoll.\n",
1843 bond_dev->name);
1844 res = -EBUSY;
1845 goto err_detach;
1846 }
1847 }
1848 #endif
1849
1850 read_unlock(&bond->lock);
1851
1852 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1853 if (res)
1854 goto err_detach;
1855
1856 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1857 new_slave);
1858 if (res) {
1859 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1860 goto err_dest_symlinks;
1861 }
1862
1863 pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1864 bond_dev->name, slave_dev->name,
1865 bond_is_active_slave(new_slave) ? "n active" : " backup",
1866 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1867
1868 /* enslave is successful */
1869 return 0;
1870
1871 /* Undo stages on error */
1872 err_dest_symlinks:
1873 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1874
1875 err_detach:
1876 if (!USES_PRIMARY(bond->params.mode))
1877 bond_hw_addr_flush(bond_dev, slave_dev);
1878
1879 bond_del_vlans_from_slave(bond, slave_dev);
1880 write_lock_bh(&bond->lock);
1881 bond_detach_slave(bond, new_slave);
1882 if (bond->primary_slave == new_slave)
1883 bond->primary_slave = NULL;
1884 if (bond->curr_active_slave == new_slave) {
1885 bond_change_active_slave(bond, NULL);
1886 write_unlock_bh(&bond->lock);
1887 read_lock(&bond->lock);
1888 write_lock_bh(&bond->curr_slave_lock);
1889 bond_select_active_slave(bond);
1890 write_unlock_bh(&bond->curr_slave_lock);
1891 read_unlock(&bond->lock);
1892 } else {
1893 write_unlock_bh(&bond->lock);
1894 }
1895 slave_disable_netpoll(new_slave);
1896
1897 err_close:
1898 slave_dev->priv_flags &= ~IFF_BONDING;
1899 dev_close(slave_dev);
1900
1901 err_unset_master:
1902 bond_upper_dev_unlink(bond_dev, slave_dev);
1903
1904 err_restore_mac:
1905 if (!bond->params.fail_over_mac) {
1906 /* XXX TODO - fom follow mode needs to change master's
1907 * MAC if this slave's MAC is in use by the bond, or at
1908 * least print a warning.
1909 */
1910 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1911 addr.sa_family = slave_dev->type;
1912 dev_set_mac_address(slave_dev, &addr);
1913 }
1914
1915 err_restore_mtu:
1916 dev_set_mtu(slave_dev, new_slave->original_mtu);
1917
1918 err_free:
1919 kfree(new_slave);
1920
1921 err_undo_flags:
1922 bond_compute_features(bond);
1923 /* Enslave of first slave has failed and we need to fix master's mac */
1924 if (bond->slave_cnt == 0 &&
1925 ether_addr_equal(bond_dev->dev_addr, slave_dev->dev_addr))
1926 eth_hw_addr_random(bond_dev);
1927
1928 return res;
1929 }
1930
1931 /*
1932 * Try to release the slave device <slave> from the bond device <master>
1933 * It is legal to access curr_active_slave without a lock because all the function
1934 * is write-locked. If "all" is true it means that the function is being called
1935 * while destroying a bond interface and all slaves are being released.
1936 *
1937 * The rules for slave state should be:
1938 * for Active/Backup:
1939 * Active stays on all backups go down
1940 * for Bonded connections:
1941 * The first up interface should be left on and all others downed.
1942 */
1943 static int __bond_release_one(struct net_device *bond_dev,
1944 struct net_device *slave_dev,
1945 bool all)
1946 {
1947 struct bonding *bond = netdev_priv(bond_dev);
1948 struct slave *slave, *oldcurrent;
1949 struct sockaddr addr;
1950 netdev_features_t old_features = bond_dev->features;
1951
1952 /* slave is not a slave or master is not master of this slave */
1953 if (!(slave_dev->flags & IFF_SLAVE) ||
1954 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1955 pr_err("%s: Error: cannot release %s.\n",
1956 bond_dev->name, slave_dev->name);
1957 return -EINVAL;
1958 }
1959
1960 block_netpoll_tx();
1961 write_lock_bh(&bond->lock);
1962
1963 slave = bond_get_slave_by_dev(bond, slave_dev);
1964 if (!slave) {
1965 /* not a slave of this bond */
1966 pr_info("%s: %s not enslaved\n",
1967 bond_dev->name, slave_dev->name);
1968 write_unlock_bh(&bond->lock);
1969 unblock_netpoll_tx();
1970 return -EINVAL;
1971 }
1972
1973 write_unlock_bh(&bond->lock);
1974 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1975 * for this slave anymore.
1976 */
1977 netdev_rx_handler_unregister(slave_dev);
1978 write_lock_bh(&bond->lock);
1979
1980 if (!all && !bond->params.fail_over_mac) {
1981 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
1982 bond->slave_cnt > 1)
1983 pr_warning("%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",
1984 bond_dev->name, slave_dev->name,
1985 slave->perm_hwaddr,
1986 bond_dev->name, slave_dev->name);
1987 }
1988
1989 /* Inform AD package of unbinding of slave. */
1990 if (bond->params.mode == BOND_MODE_8023AD) {
1991 /* must be called before the slave is
1992 * detached from the list
1993 */
1994 bond_3ad_unbind_slave(slave);
1995 }
1996
1997 pr_info("%s: releasing %s interface %s\n",
1998 bond_dev->name,
1999 bond_is_active_slave(slave) ? "active" : "backup",
2000 slave_dev->name);
2001
2002 oldcurrent = bond->curr_active_slave;
2003
2004 bond->current_arp_slave = NULL;
2005
2006 /* release the slave from its bond */
2007 bond_detach_slave(bond, slave);
2008
2009 if (bond->primary_slave == slave)
2010 bond->primary_slave = NULL;
2011
2012 if (oldcurrent == slave)
2013 bond_change_active_slave(bond, NULL);
2014
2015 if (bond_is_lb(bond)) {
2016 /* Must be called only after the slave has been
2017 * detached from the list and the curr_active_slave
2018 * has been cleared (if our_slave == old_current),
2019 * but before a new active slave is selected.
2020 */
2021 write_unlock_bh(&bond->lock);
2022 bond_alb_deinit_slave(bond, slave);
2023 write_lock_bh(&bond->lock);
2024 }
2025
2026 if (all) {
2027 bond->curr_active_slave = NULL;
2028 } else if (oldcurrent == slave) {
2029 /*
2030 * Note that we hold RTNL over this sequence, so there
2031 * is no concern that another slave add/remove event
2032 * will interfere.
2033 */
2034 write_unlock_bh(&bond->lock);
2035 read_lock(&bond->lock);
2036 write_lock_bh(&bond->curr_slave_lock);
2037
2038 bond_select_active_slave(bond);
2039
2040 write_unlock_bh(&bond->curr_slave_lock);
2041 read_unlock(&bond->lock);
2042 write_lock_bh(&bond->lock);
2043 }
2044
2045 if (bond->slave_cnt == 0) {
2046 bond_set_carrier(bond);
2047 eth_hw_addr_random(bond_dev);
2048
2049 if (bond_vlan_used(bond)) {
2050 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2051 bond_dev->name, bond_dev->name);
2052 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2053 bond_dev->name);
2054 }
2055 }
2056
2057 write_unlock_bh(&bond->lock);
2058 unblock_netpoll_tx();
2059
2060 if (bond->slave_cnt == 0) {
2061 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2062 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2063 }
2064
2065 bond_compute_features(bond);
2066 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2067 (old_features & NETIF_F_VLAN_CHALLENGED))
2068 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2069 bond_dev->name, slave_dev->name, bond_dev->name);
2070
2071 /* must do this from outside any spinlocks */
2072 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2073
2074 bond_del_vlans_from_slave(bond, slave_dev);
2075
2076 /* If the mode USES_PRIMARY, then this cases was handled above by
2077 * bond_change_active_slave(..., NULL)
2078 */
2079 if (!USES_PRIMARY(bond->params.mode)) {
2080 /* unset promiscuity level from slave */
2081 if (bond_dev->flags & IFF_PROMISC)
2082 dev_set_promiscuity(slave_dev, -1);
2083
2084 /* unset allmulti level from slave */
2085 if (bond_dev->flags & IFF_ALLMULTI)
2086 dev_set_allmulti(slave_dev, -1);
2087
2088 bond_hw_addr_flush(bond_dev, slave_dev);
2089 }
2090
2091 bond_upper_dev_unlink(bond_dev, slave_dev);
2092
2093 slave_disable_netpoll(slave);
2094
2095 /* close slave before restoring its mac address */
2096 dev_close(slave_dev);
2097
2098 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2099 /* restore original ("permanent") mac address */
2100 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2101 addr.sa_family = slave_dev->type;
2102 dev_set_mac_address(slave_dev, &addr);
2103 }
2104
2105 dev_set_mtu(slave_dev, slave->original_mtu);
2106
2107 slave_dev->priv_flags &= ~IFF_BONDING;
2108
2109 kfree(slave);
2110
2111 return 0; /* deletion OK */
2112 }
2113
2114 /* A wrapper used because of ndo_del_link */
2115 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2116 {
2117 return __bond_release_one(bond_dev, slave_dev, false);
2118 }
2119
2120 /*
2121 * First release a slave and then destroy the bond if no more slaves are left.
2122 * Must be under rtnl_lock when this function is called.
2123 */
2124 static int bond_release_and_destroy(struct net_device *bond_dev,
2125 struct net_device *slave_dev)
2126 {
2127 struct bonding *bond = netdev_priv(bond_dev);
2128 int ret;
2129
2130 ret = bond_release(bond_dev, slave_dev);
2131 if ((ret == 0) && (bond->slave_cnt == 0)) {
2132 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2133 pr_info("%s: destroying bond %s.\n",
2134 bond_dev->name, bond_dev->name);
2135 unregister_netdevice(bond_dev);
2136 }
2137 return ret;
2138 }
2139
2140 /*
2141 * This function changes the active slave to slave <slave_dev>.
2142 * It returns -EINVAL in the following cases.
2143 * - <slave_dev> is not found in the list.
2144 * - There is not active slave now.
2145 * - <slave_dev> is already active.
2146 * - The link state of <slave_dev> is not BOND_LINK_UP.
2147 * - <slave_dev> is not running.
2148 * In these cases, this function does nothing.
2149 * In the other cases, current_slave pointer is changed and 0 is returned.
2150 */
2151 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2152 {
2153 struct bonding *bond = netdev_priv(bond_dev);
2154 struct slave *old_active = NULL;
2155 struct slave *new_active = NULL;
2156 int res = 0;
2157
2158 if (!USES_PRIMARY(bond->params.mode))
2159 return -EINVAL;
2160
2161 /* Verify that bond_dev is indeed the master of slave_dev */
2162 if (!(slave_dev->flags & IFF_SLAVE) ||
2163 !netdev_has_upper_dev(slave_dev, bond_dev))
2164 return -EINVAL;
2165
2166 read_lock(&bond->lock);
2167
2168 read_lock(&bond->curr_slave_lock);
2169 old_active = bond->curr_active_slave;
2170 read_unlock(&bond->curr_slave_lock);
2171
2172 new_active = bond_get_slave_by_dev(bond, slave_dev);
2173
2174 /*
2175 * Changing to the current active: do nothing; return success.
2176 */
2177 if (new_active && (new_active == old_active)) {
2178 read_unlock(&bond->lock);
2179 return 0;
2180 }
2181
2182 if ((new_active) &&
2183 (old_active) &&
2184 (new_active->link == BOND_LINK_UP) &&
2185 IS_UP(new_active->dev)) {
2186 block_netpoll_tx();
2187 write_lock_bh(&bond->curr_slave_lock);
2188 bond_change_active_slave(bond, new_active);
2189 write_unlock_bh(&bond->curr_slave_lock);
2190 unblock_netpoll_tx();
2191 } else
2192 res = -EINVAL;
2193
2194 read_unlock(&bond->lock);
2195
2196 return res;
2197 }
2198
2199 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2200 {
2201 struct bonding *bond = netdev_priv(bond_dev);
2202
2203 info->bond_mode = bond->params.mode;
2204 info->miimon = bond->params.miimon;
2205
2206 read_lock(&bond->lock);
2207 info->num_slaves = bond->slave_cnt;
2208 read_unlock(&bond->lock);
2209
2210 return 0;
2211 }
2212
2213 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2214 {
2215 struct bonding *bond = netdev_priv(bond_dev);
2216 struct slave *slave;
2217 int i, res = -ENODEV;
2218
2219 read_lock(&bond->lock);
2220
2221 bond_for_each_slave(bond, slave, i) {
2222 if (i == (int)info->slave_id) {
2223 res = 0;
2224 strcpy(info->slave_name, slave->dev->name);
2225 info->link = slave->link;
2226 info->state = bond_slave_state(slave);
2227 info->link_failure_count = slave->link_failure_count;
2228 break;
2229 }
2230 }
2231
2232 read_unlock(&bond->lock);
2233
2234 return res;
2235 }
2236
2237 /*-------------------------------- Monitoring -------------------------------*/
2238
2239
2240 static int bond_miimon_inspect(struct bonding *bond)
2241 {
2242 struct slave *slave;
2243 int i, link_state, commit = 0;
2244 bool ignore_updelay;
2245
2246 ignore_updelay = !bond->curr_active_slave ? true : false;
2247
2248 bond_for_each_slave(bond, slave, i) {
2249 slave->new_link = BOND_LINK_NOCHANGE;
2250
2251 link_state = bond_check_dev_link(bond, slave->dev, 0);
2252
2253 switch (slave->link) {
2254 case BOND_LINK_UP:
2255 if (link_state)
2256 continue;
2257
2258 slave->link = BOND_LINK_FAIL;
2259 slave->delay = bond->params.downdelay;
2260 if (slave->delay) {
2261 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2262 bond->dev->name,
2263 (bond->params.mode ==
2264 BOND_MODE_ACTIVEBACKUP) ?
2265 (bond_is_active_slave(slave) ?
2266 "active " : "backup ") : "",
2267 slave->dev->name,
2268 bond->params.downdelay * bond->params.miimon);
2269 }
2270 /*FALLTHRU*/
2271 case BOND_LINK_FAIL:
2272 if (link_state) {
2273 /*
2274 * recovered before downdelay expired
2275 */
2276 slave->link = BOND_LINK_UP;
2277 slave->jiffies = jiffies;
2278 pr_info("%s: link status up again after %d ms for interface %s.\n",
2279 bond->dev->name,
2280 (bond->params.downdelay - slave->delay) *
2281 bond->params.miimon,
2282 slave->dev->name);
2283 continue;
2284 }
2285
2286 if (slave->delay <= 0) {
2287 slave->new_link = BOND_LINK_DOWN;
2288 commit++;
2289 continue;
2290 }
2291
2292 slave->delay--;
2293 break;
2294
2295 case BOND_LINK_DOWN:
2296 if (!link_state)
2297 continue;
2298
2299 slave->link = BOND_LINK_BACK;
2300 slave->delay = bond->params.updelay;
2301
2302 if (slave->delay) {
2303 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2304 bond->dev->name, slave->dev->name,
2305 ignore_updelay ? 0 :
2306 bond->params.updelay *
2307 bond->params.miimon);
2308 }
2309 /*FALLTHRU*/
2310 case BOND_LINK_BACK:
2311 if (!link_state) {
2312 slave->link = BOND_LINK_DOWN;
2313 pr_info("%s: link status down again after %d ms for interface %s.\n",
2314 bond->dev->name,
2315 (bond->params.updelay - slave->delay) *
2316 bond->params.miimon,
2317 slave->dev->name);
2318
2319 continue;
2320 }
2321
2322 if (ignore_updelay)
2323 slave->delay = 0;
2324
2325 if (slave->delay <= 0) {
2326 slave->new_link = BOND_LINK_UP;
2327 commit++;
2328 ignore_updelay = false;
2329 continue;
2330 }
2331
2332 slave->delay--;
2333 break;
2334 }
2335 }
2336
2337 return commit;
2338 }
2339
2340 static void bond_miimon_commit(struct bonding *bond)
2341 {
2342 struct slave *slave;
2343 int i;
2344
2345 bond_for_each_slave(bond, slave, i) {
2346 switch (slave->new_link) {
2347 case BOND_LINK_NOCHANGE:
2348 continue;
2349
2350 case BOND_LINK_UP:
2351 slave->link = BOND_LINK_UP;
2352 slave->jiffies = jiffies;
2353
2354 if (bond->params.mode == BOND_MODE_8023AD) {
2355 /* prevent it from being the active one */
2356 bond_set_backup_slave(slave);
2357 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2358 /* make it immediately active */
2359 bond_set_active_slave(slave);
2360 } else if (slave != bond->primary_slave) {
2361 /* prevent it from being the active one */
2362 bond_set_backup_slave(slave);
2363 }
2364
2365 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2366 bond->dev->name, slave->dev->name,
2367 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2368 slave->duplex ? "full" : "half");
2369
2370 /* notify ad that the link status has changed */
2371 if (bond->params.mode == BOND_MODE_8023AD)
2372 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2373
2374 if (bond_is_lb(bond))
2375 bond_alb_handle_link_change(bond, slave,
2376 BOND_LINK_UP);
2377
2378 if (!bond->curr_active_slave ||
2379 (slave == bond->primary_slave))
2380 goto do_failover;
2381
2382 continue;
2383
2384 case BOND_LINK_DOWN:
2385 if (slave->link_failure_count < UINT_MAX)
2386 slave->link_failure_count++;
2387
2388 slave->link = BOND_LINK_DOWN;
2389
2390 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2391 bond->params.mode == BOND_MODE_8023AD)
2392 bond_set_slave_inactive_flags(slave);
2393
2394 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2395 bond->dev->name, slave->dev->name);
2396
2397 if (bond->params.mode == BOND_MODE_8023AD)
2398 bond_3ad_handle_link_change(slave,
2399 BOND_LINK_DOWN);
2400
2401 if (bond_is_lb(bond))
2402 bond_alb_handle_link_change(bond, slave,
2403 BOND_LINK_DOWN);
2404
2405 if (slave == bond->curr_active_slave)
2406 goto do_failover;
2407
2408 continue;
2409
2410 default:
2411 pr_err("%s: invalid new link %d on slave %s\n",
2412 bond->dev->name, slave->new_link,
2413 slave->dev->name);
2414 slave->new_link = BOND_LINK_NOCHANGE;
2415
2416 continue;
2417 }
2418
2419 do_failover:
2420 ASSERT_RTNL();
2421 block_netpoll_tx();
2422 write_lock_bh(&bond->curr_slave_lock);
2423 bond_select_active_slave(bond);
2424 write_unlock_bh(&bond->curr_slave_lock);
2425 unblock_netpoll_tx();
2426 }
2427
2428 bond_set_carrier(bond);
2429 }
2430
2431 /*
2432 * bond_mii_monitor
2433 *
2434 * Really a wrapper that splits the mii monitor into two phases: an
2435 * inspection, then (if inspection indicates something needs to be done)
2436 * an acquisition of appropriate locks followed by a commit phase to
2437 * implement whatever link state changes are indicated.
2438 */
2439 void bond_mii_monitor(struct work_struct *work)
2440 {
2441 struct bonding *bond = container_of(work, struct bonding,
2442 mii_work.work);
2443 bool should_notify_peers = false;
2444 unsigned long delay;
2445
2446 read_lock(&bond->lock);
2447
2448 delay = msecs_to_jiffies(bond->params.miimon);
2449
2450 if (bond->slave_cnt == 0)
2451 goto re_arm;
2452
2453 should_notify_peers = bond_should_notify_peers(bond);
2454
2455 if (bond_miimon_inspect(bond)) {
2456 read_unlock(&bond->lock);
2457
2458 /* Race avoidance with bond_close cancel of workqueue */
2459 if (!rtnl_trylock()) {
2460 read_lock(&bond->lock);
2461 delay = 1;
2462 should_notify_peers = false;
2463 goto re_arm;
2464 }
2465
2466 read_lock(&bond->lock);
2467
2468 bond_miimon_commit(bond);
2469
2470 read_unlock(&bond->lock);
2471 rtnl_unlock(); /* might sleep, hold no other locks */
2472 read_lock(&bond->lock);
2473 }
2474
2475 re_arm:
2476 if (bond->params.miimon)
2477 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2478
2479 read_unlock(&bond->lock);
2480
2481 if (should_notify_peers) {
2482 if (!rtnl_trylock()) {
2483 read_lock(&bond->lock);
2484 bond->send_peer_notif++;
2485 read_unlock(&bond->lock);
2486 return;
2487 }
2488 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2489 rtnl_unlock();
2490 }
2491 }
2492
2493 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2494 {
2495 struct vlan_entry *vlan;
2496 struct net_device *vlan_dev;
2497
2498 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2499 return 1;
2500
2501 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2502 rcu_read_lock();
2503 vlan_dev = __vlan_find_dev_deep(bond->dev, htons(ETH_P_8021Q),
2504 vlan->vlan_id);
2505 rcu_read_unlock();
2506 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip))
2507 return 1;
2508 }
2509
2510 return 0;
2511 }
2512
2513 /*
2514 * We go to the (large) trouble of VLAN tagging ARP frames because
2515 * switches in VLAN mode (especially if ports are configured as
2516 * "native" to a VLAN) might not pass non-tagged frames.
2517 */
2518 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2519 {
2520 struct sk_buff *skb;
2521
2522 pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op,
2523 slave_dev->name, &dest_ip, &src_ip, vlan_id);
2524
2525 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2526 NULL, slave_dev->dev_addr, NULL);
2527
2528 if (!skb) {
2529 pr_err("ARP packet allocation failed\n");
2530 return;
2531 }
2532 if (vlan_id) {
2533 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2534 if (!skb) {
2535 pr_err("failed to insert VLAN tag\n");
2536 return;
2537 }
2538 }
2539 arp_xmit(skb);
2540 }
2541
2542
2543 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2544 {
2545 int i, vlan_id;
2546 __be32 *targets = bond->params.arp_targets;
2547 struct vlan_entry *vlan;
2548 struct net_device *vlan_dev = NULL;
2549 struct rtable *rt;
2550
2551 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2552 __be32 addr;
2553 if (!targets[i])
2554 break;
2555 pr_debug("basa: target %pI4\n", &targets[i]);
2556 if (!bond_vlan_used(bond)) {
2557 pr_debug("basa: empty vlan: arp_send\n");
2558 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2559 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2560 addr, 0);
2561 continue;
2562 }
2563
2564 /*
2565 * If VLANs are configured, we do a route lookup to
2566 * determine which VLAN interface would be used, so we
2567 * can tag the ARP with the proper VLAN tag.
2568 */
2569 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2570 RTO_ONLINK, 0);
2571 if (IS_ERR(rt)) {
2572 if (net_ratelimit()) {
2573 pr_warning("%s: no route to arp_ip_target %pI4\n",
2574 bond->dev->name, &targets[i]);
2575 }
2576 continue;
2577 }
2578
2579 /*
2580 * This target is not on a VLAN
2581 */
2582 if (rt->dst.dev == bond->dev) {
2583 ip_rt_put(rt);
2584 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2585 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2586 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2587 addr, 0);
2588 continue;
2589 }
2590
2591 vlan_id = 0;
2592 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2593 rcu_read_lock();
2594 vlan_dev = __vlan_find_dev_deep(bond->dev,
2595 htons(ETH_P_8021Q),
2596 vlan->vlan_id);
2597 rcu_read_unlock();
2598 if (vlan_dev == rt->dst.dev) {
2599 vlan_id = vlan->vlan_id;
2600 pr_debug("basa: vlan match on %s %d\n",
2601 vlan_dev->name, vlan_id);
2602 break;
2603 }
2604 }
2605
2606 if (vlan_id && vlan_dev) {
2607 ip_rt_put(rt);
2608 addr = bond_confirm_addr(vlan_dev, targets[i], 0);
2609 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2610 addr, vlan_id);
2611 continue;
2612 }
2613
2614 if (net_ratelimit()) {
2615 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2616 bond->dev->name, &targets[i],
2617 rt->dst.dev ? rt->dst.dev->name : "NULL");
2618 }
2619 ip_rt_put(rt);
2620 }
2621 }
2622
2623 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2624 {
2625 int i;
2626
2627 if (!sip || !bond_has_this_ip(bond, tip)) {
2628 pr_debug("bva: sip %pI4 tip %pI4 not found\n", &sip, &tip);
2629 return;
2630 }
2631
2632 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2633 if (i == -1) {
2634 pr_debug("bva: sip %pI4 not found in targets\n", &sip);
2635 return;
2636 }
2637 slave->last_arp_rx = jiffies;
2638 slave->target_last_arp_rx[i] = jiffies;
2639 }
2640
2641 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2642 struct slave *slave)
2643 {
2644 struct arphdr *arp = (struct arphdr *)skb->data;
2645 unsigned char *arp_ptr;
2646 __be32 sip, tip;
2647 int alen;
2648
2649 if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2650 return RX_HANDLER_ANOTHER;
2651
2652 read_lock(&bond->lock);
2653
2654 if (!slave_do_arp_validate(bond, slave))
2655 goto out_unlock;
2656
2657 alen = arp_hdr_len(bond->dev);
2658
2659 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2660 bond->dev->name, skb->dev->name);
2661
2662 if (alen > skb_headlen(skb)) {
2663 arp = kmalloc(alen, GFP_ATOMIC);
2664 if (!arp)
2665 goto out_unlock;
2666 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2667 goto out_unlock;
2668 }
2669
2670 if (arp->ar_hln != bond->dev->addr_len ||
2671 skb->pkt_type == PACKET_OTHERHOST ||
2672 skb->pkt_type == PACKET_LOOPBACK ||
2673 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2674 arp->ar_pro != htons(ETH_P_IP) ||
2675 arp->ar_pln != 4)
2676 goto out_unlock;
2677
2678 arp_ptr = (unsigned char *)(arp + 1);
2679 arp_ptr += bond->dev->addr_len;
2680 memcpy(&sip, arp_ptr, 4);
2681 arp_ptr += 4 + bond->dev->addr_len;
2682 memcpy(&tip, arp_ptr, 4);
2683
2684 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2685 bond->dev->name, slave->dev->name, bond_slave_state(slave),
2686 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2687 &sip, &tip);
2688
2689 /*
2690 * Backup slaves won't see the ARP reply, but do come through
2691 * here for each ARP probe (so we swap the sip/tip to validate
2692 * the probe). In a "redundant switch, common router" type of
2693 * configuration, the ARP probe will (hopefully) travel from
2694 * the active, through one switch, the router, then the other
2695 * switch before reaching the backup.
2696 *
2697 * We 'trust' the arp requests if there is an active slave and
2698 * it received valid arp reply(s) after it became active. This
2699 * is done to avoid endless looping when we can't reach the
2700 * arp_ip_target and fool ourselves with our own arp requests.
2701 */
2702 if (bond_is_active_slave(slave))
2703 bond_validate_arp(bond, slave, sip, tip);
2704 else if (bond->curr_active_slave &&
2705 time_after(slave_last_rx(bond, bond->curr_active_slave),
2706 bond->curr_active_slave->jiffies))
2707 bond_validate_arp(bond, slave, tip, sip);
2708
2709 out_unlock:
2710 read_unlock(&bond->lock);
2711 if (arp != (struct arphdr *)skb->data)
2712 kfree(arp);
2713 return RX_HANDLER_ANOTHER;
2714 }
2715
2716 /*
2717 * this function is called regularly to monitor each slave's link
2718 * ensuring that traffic is being sent and received when arp monitoring
2719 * is used in load-balancing mode. if the adapter has been dormant, then an
2720 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2721 * arp monitoring in active backup mode.
2722 */
2723 void bond_loadbalance_arp_mon(struct work_struct *work)
2724 {
2725 struct bonding *bond = container_of(work, struct bonding,
2726 arp_work.work);
2727 struct slave *slave, *oldcurrent;
2728 int do_failover = 0;
2729 int delta_in_ticks, extra_ticks;
2730 int i;
2731
2732 read_lock(&bond->lock);
2733
2734 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2735 extra_ticks = delta_in_ticks / 2;
2736
2737 if (bond->slave_cnt == 0)
2738 goto re_arm;
2739
2740 read_lock(&bond->curr_slave_lock);
2741 oldcurrent = bond->curr_active_slave;
2742 read_unlock(&bond->curr_slave_lock);
2743
2744 /* see if any of the previous devices are up now (i.e. they have
2745 * xmt and rcv traffic). the curr_active_slave does not come into
2746 * the picture unless it is null. also, slave->jiffies is not needed
2747 * here because we send an arp on each slave and give a slave as
2748 * long as it needs to get the tx/rx within the delta.
2749 * TODO: what about up/down delay in arp mode? it wasn't here before
2750 * so it can wait
2751 */
2752 bond_for_each_slave(bond, slave, i) {
2753 unsigned long trans_start = dev_trans_start(slave->dev);
2754
2755 if (slave->link != BOND_LINK_UP) {
2756 if (time_in_range(jiffies,
2757 trans_start - delta_in_ticks,
2758 trans_start + delta_in_ticks + extra_ticks) &&
2759 time_in_range(jiffies,
2760 slave->dev->last_rx - delta_in_ticks,
2761 slave->dev->last_rx + delta_in_ticks + extra_ticks)) {
2762
2763 slave->link = BOND_LINK_UP;
2764 bond_set_active_slave(slave);
2765
2766 /* primary_slave has no meaning in round-robin
2767 * mode. the window of a slave being up and
2768 * curr_active_slave being null after enslaving
2769 * is closed.
2770 */
2771 if (!oldcurrent) {
2772 pr_info("%s: link status definitely up for interface %s, ",
2773 bond->dev->name,
2774 slave->dev->name);
2775 do_failover = 1;
2776 } else {
2777 pr_info("%s: interface %s is now up\n",
2778 bond->dev->name,
2779 slave->dev->name);
2780 }
2781 }
2782 } else {
2783 /* slave->link == BOND_LINK_UP */
2784
2785 /* not all switches will respond to an arp request
2786 * when the source ip is 0, so don't take the link down
2787 * if we don't know our ip yet
2788 */
2789 if (!time_in_range(jiffies,
2790 trans_start - delta_in_ticks,
2791 trans_start + 2 * delta_in_ticks + extra_ticks) ||
2792 !time_in_range(jiffies,
2793 slave->dev->last_rx - delta_in_ticks,
2794 slave->dev->last_rx + 2 * delta_in_ticks + extra_ticks)) {
2795
2796 slave->link = BOND_LINK_DOWN;
2797 bond_set_backup_slave(slave);
2798
2799 if (slave->link_failure_count < UINT_MAX)
2800 slave->link_failure_count++;
2801
2802 pr_info("%s: interface %s is now down.\n",
2803 bond->dev->name,
2804 slave->dev->name);
2805
2806 if (slave == oldcurrent)
2807 do_failover = 1;
2808 }
2809 }
2810
2811 /* note: if switch is in round-robin mode, all links
2812 * must tx arp to ensure all links rx an arp - otherwise
2813 * links may oscillate or not come up at all; if switch is
2814 * in something like xor mode, there is nothing we can
2815 * do - all replies will be rx'ed on same link causing slaves
2816 * to be unstable during low/no traffic periods
2817 */
2818 if (IS_UP(slave->dev))
2819 bond_arp_send_all(bond, slave);
2820 }
2821
2822 if (do_failover) {
2823 block_netpoll_tx();
2824 write_lock_bh(&bond->curr_slave_lock);
2825
2826 bond_select_active_slave(bond);
2827
2828 write_unlock_bh(&bond->curr_slave_lock);
2829 unblock_netpoll_tx();
2830 }
2831
2832 re_arm:
2833 if (bond->params.arp_interval)
2834 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2835
2836 read_unlock(&bond->lock);
2837 }
2838
2839 /*
2840 * Called to inspect slaves for active-backup mode ARP monitor link state
2841 * changes. Sets new_link in slaves to specify what action should take
2842 * place for the slave. Returns 0 if no changes are found, >0 if changes
2843 * to link states must be committed.
2844 *
2845 * Called with bond->lock held for read.
2846 */
2847 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2848 {
2849 struct slave *slave;
2850 int i, commit = 0;
2851 unsigned long trans_start;
2852 int extra_ticks;
2853
2854 /* All the time comparisons below need some extra time. Otherwise, on
2855 * fast networks the ARP probe/reply may arrive within the same jiffy
2856 * as it was sent. Then, the next time the ARP monitor is run, one
2857 * arp_interval will already have passed in the comparisons.
2858 */
2859 extra_ticks = delta_in_ticks / 2;
2860
2861 bond_for_each_slave(bond, slave, i) {
2862 slave->new_link = BOND_LINK_NOCHANGE;
2863
2864 if (slave->link != BOND_LINK_UP) {
2865 if (time_in_range(jiffies,
2866 slave_last_rx(bond, slave) - delta_in_ticks,
2867 slave_last_rx(bond, slave) + delta_in_ticks + extra_ticks)) {
2868
2869 slave->new_link = BOND_LINK_UP;
2870 commit++;
2871 }
2872
2873 continue;
2874 }
2875
2876 /*
2877 * Give slaves 2*delta after being enslaved or made
2878 * active. This avoids bouncing, as the last receive
2879 * times need a full ARP monitor cycle to be updated.
2880 */
2881 if (time_in_range(jiffies,
2882 slave->jiffies - delta_in_ticks,
2883 slave->jiffies + 2 * delta_in_ticks + extra_ticks))
2884 continue;
2885
2886 /*
2887 * Backup slave is down if:
2888 * - No current_arp_slave AND
2889 * - more than 3*delta since last receive AND
2890 * - the bond has an IP address
2891 *
2892 * Note: a non-null current_arp_slave indicates
2893 * the curr_active_slave went down and we are
2894 * searching for a new one; under this condition
2895 * we only take the curr_active_slave down - this
2896 * gives each slave a chance to tx/rx traffic
2897 * before being taken out
2898 */
2899 if (!bond_is_active_slave(slave) &&
2900 !bond->current_arp_slave &&
2901 !time_in_range(jiffies,
2902 slave_last_rx(bond, slave) - delta_in_ticks,
2903 slave_last_rx(bond, slave) + 3 * delta_in_ticks + extra_ticks)) {
2904
2905 slave->new_link = BOND_LINK_DOWN;
2906 commit++;
2907 }
2908
2909 /*
2910 * Active slave is down if:
2911 * - more than 2*delta since transmitting OR
2912 * - (more than 2*delta since receive AND
2913 * the bond has an IP address)
2914 */
2915 trans_start = dev_trans_start(slave->dev);
2916 if (bond_is_active_slave(slave) &&
2917 (!time_in_range(jiffies,
2918 trans_start - delta_in_ticks,
2919 trans_start + 2 * delta_in_ticks + extra_ticks) ||
2920 !time_in_range(jiffies,
2921 slave_last_rx(bond, slave) - delta_in_ticks,
2922 slave_last_rx(bond, slave) + 2 * delta_in_ticks + extra_ticks))) {
2923
2924 slave->new_link = BOND_LINK_DOWN;
2925 commit++;
2926 }
2927 }
2928
2929 return commit;
2930 }
2931
2932 /*
2933 * Called to commit link state changes noted by inspection step of
2934 * active-backup mode ARP monitor.
2935 *
2936 * Called with RTNL and bond->lock for read.
2937 */
2938 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2939 {
2940 struct slave *slave;
2941 int i;
2942 unsigned long trans_start;
2943
2944 bond_for_each_slave(bond, slave, i) {
2945 switch (slave->new_link) {
2946 case BOND_LINK_NOCHANGE:
2947 continue;
2948
2949 case BOND_LINK_UP:
2950 trans_start = dev_trans_start(slave->dev);
2951 if ((!bond->curr_active_slave &&
2952 time_in_range(jiffies,
2953 trans_start - delta_in_ticks,
2954 trans_start + delta_in_ticks + delta_in_ticks / 2)) ||
2955 bond->curr_active_slave != slave) {
2956 slave->link = BOND_LINK_UP;
2957 if (bond->current_arp_slave) {
2958 bond_set_slave_inactive_flags(
2959 bond->current_arp_slave);
2960 bond->current_arp_slave = NULL;
2961 }
2962
2963 pr_info("%s: link status definitely up for interface %s.\n",
2964 bond->dev->name, slave->dev->name);
2965
2966 if (!bond->curr_active_slave ||
2967 (slave == bond->primary_slave))
2968 goto do_failover;
2969
2970 }
2971
2972 continue;
2973
2974 case BOND_LINK_DOWN:
2975 if (slave->link_failure_count < UINT_MAX)
2976 slave->link_failure_count++;
2977
2978 slave->link = BOND_LINK_DOWN;
2979 bond_set_slave_inactive_flags(slave);
2980
2981 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2982 bond->dev->name, slave->dev->name);
2983
2984 if (slave == bond->curr_active_slave) {
2985 bond->current_arp_slave = NULL;
2986 goto do_failover;
2987 }
2988
2989 continue;
2990
2991 default:
2992 pr_err("%s: impossible: new_link %d on slave %s\n",
2993 bond->dev->name, slave->new_link,
2994 slave->dev->name);
2995 continue;
2996 }
2997
2998 do_failover:
2999 ASSERT_RTNL();
3000 block_netpoll_tx();
3001 write_lock_bh(&bond->curr_slave_lock);
3002 bond_select_active_slave(bond);
3003 write_unlock_bh(&bond->curr_slave_lock);
3004 unblock_netpoll_tx();
3005 }
3006
3007 bond_set_carrier(bond);
3008 }
3009
3010 /*
3011 * Send ARP probes for active-backup mode ARP monitor.
3012 *
3013 * Called with bond->lock held for read.
3014 */
3015 static void bond_ab_arp_probe(struct bonding *bond)
3016 {
3017 struct slave *slave;
3018 int i;
3019
3020 read_lock(&bond->curr_slave_lock);
3021
3022 if (bond->current_arp_slave && bond->curr_active_slave)
3023 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3024 bond->current_arp_slave->dev->name,
3025 bond->curr_active_slave->dev->name);
3026
3027 if (bond->curr_active_slave) {
3028 bond_arp_send_all(bond, bond->curr_active_slave);
3029 read_unlock(&bond->curr_slave_lock);
3030 return;
3031 }
3032
3033 read_unlock(&bond->curr_slave_lock);
3034
3035 /* if we don't have a curr_active_slave, search for the next available
3036 * backup slave from the current_arp_slave and make it the candidate
3037 * for becoming the curr_active_slave
3038 */
3039
3040 if (!bond->current_arp_slave) {
3041 bond->current_arp_slave = bond->first_slave;
3042 if (!bond->current_arp_slave)
3043 return;
3044 }
3045
3046 bond_set_slave_inactive_flags(bond->current_arp_slave);
3047
3048 /* search for next candidate */
3049 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3050 if (IS_UP(slave->dev)) {
3051 slave->link = BOND_LINK_BACK;
3052 bond_set_slave_active_flags(slave);
3053 bond_arp_send_all(bond, slave);
3054 slave->jiffies = jiffies;
3055 bond->current_arp_slave = slave;
3056 break;
3057 }
3058
3059 /* if the link state is up at this point, we
3060 * mark it down - this can happen if we have
3061 * simultaneous link failures and
3062 * reselect_active_interface doesn't make this
3063 * one the current slave so it is still marked
3064 * up when it is actually down
3065 */
3066 if (slave->link == BOND_LINK_UP) {
3067 slave->link = BOND_LINK_DOWN;
3068 if (slave->link_failure_count < UINT_MAX)
3069 slave->link_failure_count++;
3070
3071 bond_set_slave_inactive_flags(slave);
3072
3073 pr_info("%s: backup interface %s is now down.\n",
3074 bond->dev->name, slave->dev->name);
3075 }
3076 }
3077 }
3078
3079 void bond_activebackup_arp_mon(struct work_struct *work)
3080 {
3081 struct bonding *bond = container_of(work, struct bonding,
3082 arp_work.work);
3083 bool should_notify_peers = false;
3084 int delta_in_ticks;
3085
3086 read_lock(&bond->lock);
3087
3088 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3089
3090 if (bond->slave_cnt == 0)
3091 goto re_arm;
3092
3093 should_notify_peers = bond_should_notify_peers(bond);
3094
3095 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3096 read_unlock(&bond->lock);
3097
3098 /* Race avoidance with bond_close flush of workqueue */
3099 if (!rtnl_trylock()) {
3100 read_lock(&bond->lock);
3101 delta_in_ticks = 1;
3102 should_notify_peers = false;
3103 goto re_arm;
3104 }
3105
3106 read_lock(&bond->lock);
3107
3108 bond_ab_arp_commit(bond, delta_in_ticks);
3109
3110 read_unlock(&bond->lock);
3111 rtnl_unlock();
3112 read_lock(&bond->lock);
3113 }
3114
3115 bond_ab_arp_probe(bond);
3116
3117 re_arm:
3118 if (bond->params.arp_interval)
3119 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3120
3121 read_unlock(&bond->lock);
3122
3123 if (should_notify_peers) {
3124 if (!rtnl_trylock()) {
3125 read_lock(&bond->lock);
3126 bond->send_peer_notif++;
3127 read_unlock(&bond->lock);
3128 return;
3129 }
3130 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
3131 rtnl_unlock();
3132 }
3133 }
3134
3135 /*-------------------------- netdev event handling --------------------------*/
3136
3137 /*
3138 * Change device name
3139 */
3140 static int bond_event_changename(struct bonding *bond)
3141 {
3142 bond_remove_proc_entry(bond);
3143 bond_create_proc_entry(bond);
3144
3145 bond_debug_reregister(bond);
3146
3147 return NOTIFY_DONE;
3148 }
3149
3150 static int bond_master_netdev_event(unsigned long event,
3151 struct net_device *bond_dev)
3152 {
3153 struct bonding *event_bond = netdev_priv(bond_dev);
3154
3155 switch (event) {
3156 case NETDEV_CHANGENAME:
3157 return bond_event_changename(event_bond);
3158 case NETDEV_UNREGISTER:
3159 bond_remove_proc_entry(event_bond);
3160 break;
3161 case NETDEV_REGISTER:
3162 bond_create_proc_entry(event_bond);
3163 break;
3164 default:
3165 break;
3166 }
3167
3168 return NOTIFY_DONE;
3169 }
3170
3171 static int bond_slave_netdev_event(unsigned long event,
3172 struct net_device *slave_dev)
3173 {
3174 struct slave *slave = bond_slave_get_rtnl(slave_dev);
3175 struct bonding *bond;
3176 struct net_device *bond_dev;
3177 u32 old_speed;
3178 u8 old_duplex;
3179
3180 /* A netdev event can be generated while enslaving a device
3181 * before netdev_rx_handler_register is called in which case
3182 * slave will be NULL
3183 */
3184 if (!slave)
3185 return NOTIFY_DONE;
3186 bond_dev = slave->bond->dev;
3187 bond = slave->bond;
3188
3189 switch (event) {
3190 case NETDEV_UNREGISTER:
3191 if (bond_dev->type != ARPHRD_ETHER)
3192 bond_release_and_destroy(bond_dev, slave_dev);
3193 else
3194 bond_release(bond_dev, slave_dev);
3195 break;
3196 case NETDEV_UP:
3197 case NETDEV_CHANGE:
3198 old_speed = slave->speed;
3199 old_duplex = slave->duplex;
3200
3201 bond_update_speed_duplex(slave);
3202
3203 if (bond->params.mode == BOND_MODE_8023AD) {
3204 if (old_speed != slave->speed)
3205 bond_3ad_adapter_speed_changed(slave);
3206 if (old_duplex != slave->duplex)
3207 bond_3ad_adapter_duplex_changed(slave);
3208 }
3209 break;
3210 case NETDEV_DOWN:
3211 /*
3212 * ... Or is it this?
3213 */
3214 break;
3215 case NETDEV_CHANGEMTU:
3216 /*
3217 * TODO: Should slaves be allowed to
3218 * independently alter their MTU? For
3219 * an active-backup bond, slaves need
3220 * not be the same type of device, so
3221 * MTUs may vary. For other modes,
3222 * slaves arguably should have the
3223 * same MTUs. To do this, we'd need to
3224 * take over the slave's change_mtu
3225 * function for the duration of their
3226 * servitude.
3227 */
3228 break;
3229 case NETDEV_CHANGENAME:
3230 /*
3231 * TODO: handle changing the primary's name
3232 */
3233 break;
3234 case NETDEV_FEAT_CHANGE:
3235 bond_compute_features(bond);
3236 break;
3237 default:
3238 break;
3239 }
3240
3241 return NOTIFY_DONE;
3242 }
3243
3244 /*
3245 * bond_netdev_event: handle netdev notifier chain events.
3246 *
3247 * This function receives events for the netdev chain. The caller (an
3248 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3249 * locks for us to safely manipulate the slave devices (RTNL lock,
3250 * dev_probe_lock).
3251 */
3252 static int bond_netdev_event(struct notifier_block *this,
3253 unsigned long event, void *ptr)
3254 {
3255 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3256
3257 pr_debug("event_dev: %s, event: %lx\n",
3258 event_dev ? event_dev->name : "None",
3259 event);
3260
3261 if (!(event_dev->priv_flags & IFF_BONDING))
3262 return NOTIFY_DONE;
3263
3264 if (event_dev->flags & IFF_MASTER) {
3265 pr_debug("IFF_MASTER\n");
3266 return bond_master_netdev_event(event, event_dev);
3267 }
3268
3269 if (event_dev->flags & IFF_SLAVE) {
3270 pr_debug("IFF_SLAVE\n");
3271 return bond_slave_netdev_event(event, event_dev);
3272 }
3273
3274 return NOTIFY_DONE;
3275 }
3276
3277 static struct notifier_block bond_netdev_notifier = {
3278 .notifier_call = bond_netdev_event,
3279 };
3280
3281 /*---------------------------- Hashing Policies -----------------------------*/
3282
3283 /*
3284 * Hash for the output device based upon layer 2 data
3285 */
3286 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3287 {
3288 struct ethhdr *data = (struct ethhdr *)skb->data;
3289
3290 if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
3291 return (data->h_dest[5] ^ data->h_source[5]) % count;
3292
3293 return 0;
3294 }
3295
3296 /*
3297 * Hash for the output device based upon layer 2 and layer 3 data. If
3298 * the packet is not IP, fall back on bond_xmit_hash_policy_l2()
3299 */
3300 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3301 {
3302 const struct ethhdr *data;
3303 const struct iphdr *iph;
3304 const struct ipv6hdr *ipv6h;
3305 u32 v6hash;
3306 const __be32 *s, *d;
3307
3308 if (skb->protocol == htons(ETH_P_IP) &&
3309 pskb_network_may_pull(skb, sizeof(*iph))) {
3310 iph = ip_hdr(skb);
3311 data = (struct ethhdr *)skb->data;
3312 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3313 (data->h_dest[5] ^ data->h_source[5])) % count;
3314 } else if (skb->protocol == htons(ETH_P_IPV6) &&
3315 pskb_network_may_pull(skb, sizeof(*ipv6h))) {
3316 ipv6h = ipv6_hdr(skb);
3317 data = (struct ethhdr *)skb->data;
3318 s = &ipv6h->saddr.s6_addr32[0];
3319 d = &ipv6h->daddr.s6_addr32[0];
3320 v6hash = (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3321 v6hash ^= (v6hash >> 24) ^ (v6hash >> 16) ^ (v6hash >> 8);
3322 return (v6hash ^ data->h_dest[5] ^ data->h_source[5]) % count;
3323 }
3324
3325 return bond_xmit_hash_policy_l2(skb, count);
3326 }
3327
3328 /*
3329 * Hash for the output device based upon layer 3 and layer 4 data. If
3330 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3331 * altogether not IP, fall back on bond_xmit_hash_policy_l2()
3332 */
3333 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3334 {
3335 u32 layer4_xor = 0;
3336 const struct iphdr *iph;
3337 const struct ipv6hdr *ipv6h;
3338 const __be32 *s, *d;
3339 const __be16 *l4 = NULL;
3340 __be16 _l4[2];
3341 int noff = skb_network_offset(skb);
3342 int poff;
3343
3344 if (skb->protocol == htons(ETH_P_IP) &&
3345 pskb_may_pull(skb, noff + sizeof(*iph))) {
3346 iph = ip_hdr(skb);
3347 poff = proto_ports_offset(iph->protocol);
3348
3349 if (!ip_is_fragment(iph) && poff >= 0) {
3350 l4 = skb_header_pointer(skb, noff + (iph->ihl << 2) + poff,
3351 sizeof(_l4), &_l4);
3352 if (l4)
3353 layer4_xor = ntohs(l4[0] ^ l4[1]);
3354 }
3355 return (layer4_xor ^
3356 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3357 } else if (skb->protocol == htons(ETH_P_IPV6) &&
3358 pskb_may_pull(skb, noff + sizeof(*ipv6h))) {
3359 ipv6h = ipv6_hdr(skb);
3360 poff = proto_ports_offset(ipv6h->nexthdr);
3361 if (poff >= 0) {
3362 l4 = skb_header_pointer(skb, noff + sizeof(*ipv6h) + poff,
3363 sizeof(_l4), &_l4);
3364 if (l4)
3365 layer4_xor = ntohs(l4[0] ^ l4[1]);
3366 }
3367 s = &ipv6h->saddr.s6_addr32[0];
3368 d = &ipv6h->daddr.s6_addr32[0];
3369 layer4_xor ^= (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3370 layer4_xor ^= (layer4_xor >> 24) ^ (layer4_xor >> 16) ^
3371 (layer4_xor >> 8);
3372 return layer4_xor % count;
3373 }
3374
3375 return bond_xmit_hash_policy_l2(skb, count);
3376 }
3377
3378 /*-------------------------- Device entry points ----------------------------*/
3379
3380 static void bond_work_init_all(struct bonding *bond)
3381 {
3382 INIT_DELAYED_WORK(&bond->mcast_work,
3383 bond_resend_igmp_join_requests_delayed);
3384 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3385 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3386 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3387 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3388 else
3389 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3390 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3391 }
3392
3393 static void bond_work_cancel_all(struct bonding *bond)
3394 {
3395 cancel_delayed_work_sync(&bond->mii_work);
3396 cancel_delayed_work_sync(&bond->arp_work);
3397 cancel_delayed_work_sync(&bond->alb_work);
3398 cancel_delayed_work_sync(&bond->ad_work);
3399 cancel_delayed_work_sync(&bond->mcast_work);
3400 }
3401
3402 static int bond_open(struct net_device *bond_dev)
3403 {
3404 struct bonding *bond = netdev_priv(bond_dev);
3405 struct slave *slave;
3406 int i;
3407
3408 /* reset slave->backup and slave->inactive */
3409 read_lock(&bond->lock);
3410 if (bond->slave_cnt > 0) {
3411 read_lock(&bond->curr_slave_lock);
3412 bond_for_each_slave(bond, slave, i) {
3413 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3414 && (slave != bond->curr_active_slave)) {
3415 bond_set_slave_inactive_flags(slave);
3416 } else {
3417 bond_set_slave_active_flags(slave);
3418 }
3419 }
3420 read_unlock(&bond->curr_slave_lock);
3421 }
3422 read_unlock(&bond->lock);
3423
3424 bond_work_init_all(bond);
3425
3426 if (bond_is_lb(bond)) {
3427 /* bond_alb_initialize must be called before the timer
3428 * is started.
3429 */
3430 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3431 return -ENOMEM;
3432 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3433 }
3434
3435 if (bond->params.miimon) /* link check interval, in milliseconds. */
3436 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3437
3438 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3439 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3440 if (bond->params.arp_validate)
3441 bond->recv_probe = bond_arp_rcv;
3442 }
3443
3444 if (bond->params.mode == BOND_MODE_8023AD) {
3445 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3446 /* register to receive LACPDUs */
3447 bond->recv_probe = bond_3ad_lacpdu_recv;
3448 bond_3ad_initiate_agg_selection(bond, 1);
3449 }
3450
3451 return 0;
3452 }
3453
3454 static int bond_close(struct net_device *bond_dev)
3455 {
3456 struct bonding *bond = netdev_priv(bond_dev);
3457
3458 write_lock_bh(&bond->lock);
3459 bond->send_peer_notif = 0;
3460 write_unlock_bh(&bond->lock);
3461
3462 bond_work_cancel_all(bond);
3463 if (bond_is_lb(bond)) {
3464 /* Must be called only after all
3465 * slaves have been released
3466 */
3467 bond_alb_deinitialize(bond);
3468 }
3469 bond->recv_probe = NULL;
3470
3471 return 0;
3472 }
3473
3474 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3475 struct rtnl_link_stats64 *stats)
3476 {
3477 struct bonding *bond = netdev_priv(bond_dev);
3478 struct rtnl_link_stats64 temp;
3479 struct slave *slave;
3480 int i;
3481
3482 memset(stats, 0, sizeof(*stats));
3483
3484 read_lock_bh(&bond->lock);
3485
3486 bond_for_each_slave(bond, slave, i) {
3487 const struct rtnl_link_stats64 *sstats =
3488 dev_get_stats(slave->dev, &temp);
3489
3490 stats->rx_packets += sstats->rx_packets;
3491 stats->rx_bytes += sstats->rx_bytes;
3492 stats->rx_errors += sstats->rx_errors;
3493 stats->rx_dropped += sstats->rx_dropped;
3494
3495 stats->tx_packets += sstats->tx_packets;
3496 stats->tx_bytes += sstats->tx_bytes;
3497 stats->tx_errors += sstats->tx_errors;
3498 stats->tx_dropped += sstats->tx_dropped;
3499
3500 stats->multicast += sstats->multicast;
3501 stats->collisions += sstats->collisions;
3502
3503 stats->rx_length_errors += sstats->rx_length_errors;
3504 stats->rx_over_errors += sstats->rx_over_errors;
3505 stats->rx_crc_errors += sstats->rx_crc_errors;
3506 stats->rx_frame_errors += sstats->rx_frame_errors;
3507 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3508 stats->rx_missed_errors += sstats->rx_missed_errors;
3509
3510 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3511 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3512 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3513 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3514 stats->tx_window_errors += sstats->tx_window_errors;
3515 }
3516
3517 read_unlock_bh(&bond->lock);
3518
3519 return stats;
3520 }
3521
3522 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3523 {
3524 struct net_device *slave_dev = NULL;
3525 struct ifbond k_binfo;
3526 struct ifbond __user *u_binfo = NULL;
3527 struct ifslave k_sinfo;
3528 struct ifslave __user *u_sinfo = NULL;
3529 struct mii_ioctl_data *mii = NULL;
3530 struct net *net;
3531 int res = 0;
3532
3533 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3534
3535 switch (cmd) {
3536 case SIOCGMIIPHY:
3537 mii = if_mii(ifr);
3538 if (!mii)
3539 return -EINVAL;
3540
3541 mii->phy_id = 0;
3542 /* Fall Through */
3543 case SIOCGMIIREG:
3544 /*
3545 * We do this again just in case we were called by SIOCGMIIREG
3546 * instead of SIOCGMIIPHY.
3547 */
3548 mii = if_mii(ifr);
3549 if (!mii)
3550 return -EINVAL;
3551
3552
3553 if (mii->reg_num == 1) {
3554 struct bonding *bond = netdev_priv(bond_dev);
3555 mii->val_out = 0;
3556 read_lock(&bond->lock);
3557 read_lock(&bond->curr_slave_lock);
3558 if (netif_carrier_ok(bond->dev))
3559 mii->val_out = BMSR_LSTATUS;
3560
3561 read_unlock(&bond->curr_slave_lock);
3562 read_unlock(&bond->lock);
3563 }
3564
3565 return 0;
3566 case BOND_INFO_QUERY_OLD:
3567 case SIOCBONDINFOQUERY:
3568 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3569
3570 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3571 return -EFAULT;
3572
3573 res = bond_info_query(bond_dev, &k_binfo);
3574 if (res == 0 &&
3575 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3576 return -EFAULT;
3577
3578 return res;
3579 case BOND_SLAVE_INFO_QUERY_OLD:
3580 case SIOCBONDSLAVEINFOQUERY:
3581 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3582
3583 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3584 return -EFAULT;
3585
3586 res = bond_slave_info_query(bond_dev, &k_sinfo);
3587 if (res == 0 &&
3588 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3589 return -EFAULT;
3590
3591 return res;
3592 default:
3593 /* Go on */
3594 break;
3595 }
3596
3597 net = dev_net(bond_dev);
3598
3599 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3600 return -EPERM;
3601
3602 slave_dev = dev_get_by_name(net, ifr->ifr_slave);
3603
3604 pr_debug("slave_dev=%p:\n", slave_dev);
3605
3606 if (!slave_dev)
3607 res = -ENODEV;
3608 else {
3609 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3610 switch (cmd) {
3611 case BOND_ENSLAVE_OLD:
3612 case SIOCBONDENSLAVE:
3613 res = bond_enslave(bond_dev, slave_dev);
3614 break;
3615 case BOND_RELEASE_OLD:
3616 case SIOCBONDRELEASE:
3617 res = bond_release(bond_dev, slave_dev);
3618 break;
3619 case BOND_SETHWADDR_OLD:
3620 case SIOCBONDSETHWADDR:
3621 bond_set_dev_addr(bond_dev, slave_dev);
3622 res = 0;
3623 break;
3624 case BOND_CHANGE_ACTIVE_OLD:
3625 case SIOCBONDCHANGEACTIVE:
3626 res = bond_ioctl_change_active(bond_dev, slave_dev);
3627 break;
3628 default:
3629 res = -EOPNOTSUPP;
3630 }
3631
3632 dev_put(slave_dev);
3633 }
3634
3635 return res;
3636 }
3637
3638 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3639 {
3640 struct bonding *bond = netdev_priv(bond_dev);
3641
3642 if (change & IFF_PROMISC)
3643 bond_set_promiscuity(bond,
3644 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3645
3646 if (change & IFF_ALLMULTI)
3647 bond_set_allmulti(bond,
3648 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3649 }
3650
3651 static void bond_set_rx_mode(struct net_device *bond_dev)
3652 {
3653 struct bonding *bond = netdev_priv(bond_dev);
3654 struct slave *slave;
3655 int i;
3656
3657 read_lock(&bond->lock);
3658
3659 if (USES_PRIMARY(bond->params.mode)) {
3660 read_lock(&bond->curr_slave_lock);
3661 slave = bond->curr_active_slave;
3662 if (slave) {
3663 dev_uc_sync(slave->dev, bond_dev);
3664 dev_mc_sync(slave->dev, bond_dev);
3665 }
3666 read_unlock(&bond->curr_slave_lock);
3667 } else {
3668 bond_for_each_slave(bond, slave, i) {
3669 dev_uc_sync_multiple(slave->dev, bond_dev);
3670 dev_mc_sync_multiple(slave->dev, bond_dev);
3671 }
3672 }
3673
3674 read_unlock(&bond->lock);
3675 }
3676
3677 static int bond_neigh_init(struct neighbour *n)
3678 {
3679 struct bonding *bond = netdev_priv(n->dev);
3680 struct slave *slave = bond->first_slave;
3681 const struct net_device_ops *slave_ops;
3682 struct neigh_parms parms;
3683 int ret;
3684
3685 if (!slave)
3686 return 0;
3687
3688 slave_ops = slave->dev->netdev_ops;
3689
3690 if (!slave_ops->ndo_neigh_setup)
3691 return 0;
3692
3693 parms.neigh_setup = NULL;
3694 parms.neigh_cleanup = NULL;
3695 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3696 if (ret)
3697 return ret;
3698
3699 /*
3700 * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3701 * after the last slave has been detached. Assumes that all slaves
3702 * utilize the same neigh_cleanup (true at this writing as only user
3703 * is ipoib).
3704 */
3705 n->parms->neigh_cleanup = parms.neigh_cleanup;
3706
3707 if (!parms.neigh_setup)
3708 return 0;
3709
3710 return parms.neigh_setup(n);
3711 }
3712
3713 /*
3714 * The bonding ndo_neigh_setup is called at init time beofre any
3715 * slave exists. So we must declare proxy setup function which will
3716 * be used at run time to resolve the actual slave neigh param setup.
3717 */
3718 static int bond_neigh_setup(struct net_device *dev,
3719 struct neigh_parms *parms)
3720 {
3721 parms->neigh_setup = bond_neigh_init;
3722
3723 return 0;
3724 }
3725
3726 /*
3727 * Change the MTU of all of a master's slaves to match the master
3728 */
3729 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3730 {
3731 struct bonding *bond = netdev_priv(bond_dev);
3732 struct slave *slave, *stop_at;
3733 int res = 0;
3734 int i;
3735
3736 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3737 (bond_dev ? bond_dev->name : "None"), new_mtu);
3738
3739 /* Can't hold bond->lock with bh disabled here since
3740 * some base drivers panic. On the other hand we can't
3741 * hold bond->lock without bh disabled because we'll
3742 * deadlock. The only solution is to rely on the fact
3743 * that we're under rtnl_lock here, and the slaves
3744 * list won't change. This doesn't solve the problem
3745 * of setting the slave's MTU while it is
3746 * transmitting, but the assumption is that the base
3747 * driver can handle that.
3748 *
3749 * TODO: figure out a way to safely iterate the slaves
3750 * list, but without holding a lock around the actual
3751 * call to the base driver.
3752 */
3753
3754 bond_for_each_slave(bond, slave, i) {
3755 pr_debug("s %p s->p %p c_m %p\n",
3756 slave,
3757 slave->prev,
3758 slave->dev->netdev_ops->ndo_change_mtu);
3759
3760 res = dev_set_mtu(slave->dev, new_mtu);
3761
3762 if (res) {
3763 /* If we failed to set the slave's mtu to the new value
3764 * we must abort the operation even in ACTIVE_BACKUP
3765 * mode, because if we allow the backup slaves to have
3766 * different mtu values than the active slave we'll
3767 * need to change their mtu when doing a failover. That
3768 * means changing their mtu from timer context, which
3769 * is probably not a good idea.
3770 */
3771 pr_debug("err %d %s\n", res, slave->dev->name);
3772 goto unwind;
3773 }
3774 }
3775
3776 bond_dev->mtu = new_mtu;
3777
3778 return 0;
3779
3780 unwind:
3781 /* unwind from head to the slave that failed */
3782 stop_at = slave;
3783 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3784 int tmp_res;
3785
3786 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3787 if (tmp_res) {
3788 pr_debug("unwind err %d dev %s\n",
3789 tmp_res, slave->dev->name);
3790 }
3791 }
3792
3793 return res;
3794 }
3795
3796 /*
3797 * Change HW address
3798 *
3799 * Note that many devices must be down to change the HW address, and
3800 * downing the master releases all slaves. We can make bonds full of
3801 * bonding devices to test this, however.
3802 */
3803 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3804 {
3805 struct bonding *bond = netdev_priv(bond_dev);
3806 struct sockaddr *sa = addr, tmp_sa;
3807 struct slave *slave, *stop_at;
3808 int res = 0;
3809 int i;
3810
3811 if (bond->params.mode == BOND_MODE_ALB)
3812 return bond_alb_set_mac_address(bond_dev, addr);
3813
3814
3815 pr_debug("bond=%p, name=%s\n",
3816 bond, bond_dev ? bond_dev->name : "None");
3817
3818 /* If fail_over_mac is enabled, do nothing and return success.
3819 * Returning an error causes ifenslave to fail.
3820 */
3821 if (bond->params.fail_over_mac)
3822 return 0;
3823
3824 if (!is_valid_ether_addr(sa->sa_data))
3825 return -EADDRNOTAVAIL;
3826
3827 /* Can't hold bond->lock with bh disabled here since
3828 * some base drivers panic. On the other hand we can't
3829 * hold bond->lock without bh disabled because we'll
3830 * deadlock. The only solution is to rely on the fact
3831 * that we're under rtnl_lock here, and the slaves
3832 * list won't change. This doesn't solve the problem
3833 * of setting the slave's hw address while it is
3834 * transmitting, but the assumption is that the base
3835 * driver can handle that.
3836 *
3837 * TODO: figure out a way to safely iterate the slaves
3838 * list, but without holding a lock around the actual
3839 * call to the base driver.
3840 */
3841
3842 bond_for_each_slave(bond, slave, i) {
3843 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3844 pr_debug("slave %p %s\n", slave, slave->dev->name);
3845
3846 if (slave_ops->ndo_set_mac_address == NULL) {
3847 res = -EOPNOTSUPP;
3848 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3849 goto unwind;
3850 }
3851
3852 res = dev_set_mac_address(slave->dev, addr);
3853 if (res) {
3854 /* TODO: consider downing the slave
3855 * and retry ?
3856 * User should expect communications
3857 * breakage anyway until ARP finish
3858 * updating, so...
3859 */
3860 pr_debug("err %d %s\n", res, slave->dev->name);
3861 goto unwind;
3862 }
3863 }
3864
3865 /* success */
3866 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3867 return 0;
3868
3869 unwind:
3870 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3871 tmp_sa.sa_family = bond_dev->type;
3872
3873 /* unwind from head to the slave that failed */
3874 stop_at = slave;
3875 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3876 int tmp_res;
3877
3878 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3879 if (tmp_res) {
3880 pr_debug("unwind err %d dev %s\n",
3881 tmp_res, slave->dev->name);
3882 }
3883 }
3884
3885 return res;
3886 }
3887
3888 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3889 {
3890 struct bonding *bond = netdev_priv(bond_dev);
3891 struct slave *slave, *start_at;
3892 int i, slave_no, res = 1;
3893 struct iphdr *iph = ip_hdr(skb);
3894
3895 /*
3896 * Start with the curr_active_slave that joined the bond as the
3897 * default for sending IGMP traffic. For failover purposes one
3898 * needs to maintain some consistency for the interface that will
3899 * send the join/membership reports. The curr_active_slave found
3900 * will send all of this type of traffic.
3901 */
3902 if ((iph->protocol == IPPROTO_IGMP) &&
3903 (skb->protocol == htons(ETH_P_IP))) {
3904
3905 read_lock(&bond->curr_slave_lock);
3906 slave = bond->curr_active_slave;
3907 read_unlock(&bond->curr_slave_lock);
3908
3909 if (!slave)
3910 goto out;
3911 } else {
3912 /*
3913 * Concurrent TX may collide on rr_tx_counter; we accept
3914 * that as being rare enough not to justify using an
3915 * atomic op here.
3916 */
3917 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3918
3919 bond_for_each_slave(bond, slave, i) {
3920 slave_no--;
3921 if (slave_no < 0)
3922 break;
3923 }
3924 }
3925
3926 start_at = slave;
3927 bond_for_each_slave_from(bond, slave, i, start_at) {
3928 if (IS_UP(slave->dev) &&
3929 (slave->link == BOND_LINK_UP) &&
3930 bond_is_active_slave(slave)) {
3931 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3932 break;
3933 }
3934 }
3935
3936 out:
3937 if (res) {
3938 /* no suitable interface, frame not sent */
3939 kfree_skb(skb);
3940 }
3941
3942 return NETDEV_TX_OK;
3943 }
3944
3945
3946 /*
3947 * in active-backup mode, we know that bond->curr_active_slave is always valid if
3948 * the bond has a usable interface.
3949 */
3950 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3951 {
3952 struct bonding *bond = netdev_priv(bond_dev);
3953 int res = 1;
3954
3955 read_lock(&bond->curr_slave_lock);
3956
3957 if (bond->curr_active_slave)
3958 res = bond_dev_queue_xmit(bond, skb,
3959 bond->curr_active_slave->dev);
3960
3961 read_unlock(&bond->curr_slave_lock);
3962
3963 if (res)
3964 /* no suitable interface, frame not sent */
3965 kfree_skb(skb);
3966
3967 return NETDEV_TX_OK;
3968 }
3969
3970 /*
3971 * In bond_xmit_xor() , we determine the output device by using a pre-
3972 * determined xmit_hash_policy(), If the selected device is not enabled,
3973 * find the next active slave.
3974 */
3975 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3976 {
3977 struct bonding *bond = netdev_priv(bond_dev);
3978 struct slave *slave, *start_at;
3979 int slave_no;
3980 int i;
3981 int res = 1;
3982
3983 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
3984
3985 bond_for_each_slave(bond, slave, i) {
3986 slave_no--;
3987 if (slave_no < 0)
3988 break;
3989 }
3990
3991 start_at = slave;
3992
3993 bond_for_each_slave_from(bond, slave, i, start_at) {
3994 if (IS_UP(slave->dev) &&
3995 (slave->link == BOND_LINK_UP) &&
3996 bond_is_active_slave(slave)) {
3997 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3998 break;
3999 }
4000 }
4001
4002 if (res) {
4003 /* no suitable interface, frame not sent */
4004 kfree_skb(skb);
4005 }
4006
4007 return NETDEV_TX_OK;
4008 }
4009
4010 /*
4011 * in broadcast mode, we send everything to all usable interfaces.
4012 */
4013 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4014 {
4015 struct bonding *bond = netdev_priv(bond_dev);
4016 struct slave *slave, *start_at;
4017 struct net_device *tx_dev = NULL;
4018 int i;
4019 int res = 1;
4020
4021 read_lock(&bond->curr_slave_lock);
4022 start_at = bond->curr_active_slave;
4023 read_unlock(&bond->curr_slave_lock);
4024
4025 if (!start_at)
4026 goto out;
4027
4028 bond_for_each_slave_from(bond, slave, i, start_at) {
4029 if (IS_UP(slave->dev) &&
4030 (slave->link == BOND_LINK_UP) &&
4031 bond_is_active_slave(slave)) {
4032 if (tx_dev) {
4033 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4034 if (!skb2) {
4035 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4036 bond_dev->name);
4037 continue;
4038 }
4039
4040 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4041 if (res) {
4042 kfree_skb(skb2);
4043 continue;
4044 }
4045 }
4046 tx_dev = slave->dev;
4047 }
4048 }
4049
4050 if (tx_dev)
4051 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4052
4053 out:
4054 if (res)
4055 /* no suitable interface, frame not sent */
4056 kfree_skb(skb);
4057
4058 /* frame sent to all suitable interfaces */
4059 return NETDEV_TX_OK;
4060 }
4061
4062 /*------------------------- Device initialization ---------------------------*/
4063
4064 static void bond_set_xmit_hash_policy(struct bonding *bond)
4065 {
4066 switch (bond->params.xmit_policy) {
4067 case BOND_XMIT_POLICY_LAYER23:
4068 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4069 break;
4070 case BOND_XMIT_POLICY_LAYER34:
4071 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4072 break;
4073 case BOND_XMIT_POLICY_LAYER2:
4074 default:
4075 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4076 break;
4077 }
4078 }
4079
4080 /*
4081 * Lookup the slave that corresponds to a qid
4082 */
4083 static inline int bond_slave_override(struct bonding *bond,
4084 struct sk_buff *skb)
4085 {
4086 int i, res = 1;
4087 struct slave *slave = NULL;
4088 struct slave *check_slave;
4089
4090 if (!skb->queue_mapping)
4091 return 1;
4092
4093 /* Find out if any slaves have the same mapping as this skb. */
4094 bond_for_each_slave(bond, check_slave, i) {
4095 if (check_slave->queue_id == skb->queue_mapping) {
4096 slave = check_slave;
4097 break;
4098 }
4099 }
4100
4101 /* If the slave isn't UP, use default transmit policy. */
4102 if (slave && slave->queue_id && IS_UP(slave->dev) &&
4103 (slave->link == BOND_LINK_UP)) {
4104 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4105 }
4106
4107 return res;
4108 }
4109
4110
4111 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4112 {
4113 /*
4114 * This helper function exists to help dev_pick_tx get the correct
4115 * destination queue. Using a helper function skips a call to
4116 * skb_tx_hash and will put the skbs in the queue we expect on their
4117 * way down to the bonding driver.
4118 */
4119 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4120
4121 /*
4122 * Save the original txq to restore before passing to the driver
4123 */
4124 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4125
4126 if (unlikely(txq >= dev->real_num_tx_queues)) {
4127 do {
4128 txq -= dev->real_num_tx_queues;
4129 } while (txq >= dev->real_num_tx_queues);
4130 }
4131 return txq;
4132 }
4133
4134 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4135 {
4136 struct bonding *bond = netdev_priv(dev);
4137
4138 if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4139 if (!bond_slave_override(bond, skb))
4140 return NETDEV_TX_OK;
4141 }
4142
4143 switch (bond->params.mode) {
4144 case BOND_MODE_ROUNDROBIN:
4145 return bond_xmit_roundrobin(skb, dev);
4146 case BOND_MODE_ACTIVEBACKUP:
4147 return bond_xmit_activebackup(skb, dev);
4148 case BOND_MODE_XOR:
4149 return bond_xmit_xor(skb, dev);
4150 case BOND_MODE_BROADCAST:
4151 return bond_xmit_broadcast(skb, dev);
4152 case BOND_MODE_8023AD:
4153 return bond_3ad_xmit_xor(skb, dev);
4154 case BOND_MODE_ALB:
4155 case BOND_MODE_TLB:
4156 return bond_alb_xmit(skb, dev);
4157 default:
4158 /* Should never happen, mode already checked */
4159 pr_err("%s: Error: Unknown bonding mode %d\n",
4160 dev->name, bond->params.mode);
4161 WARN_ON_ONCE(1);
4162 kfree_skb(skb);
4163 return NETDEV_TX_OK;
4164 }
4165 }
4166
4167 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4168 {
4169 struct bonding *bond = netdev_priv(dev);
4170 netdev_tx_t ret = NETDEV_TX_OK;
4171
4172 /*
4173 * If we risk deadlock from transmitting this in the
4174 * netpoll path, tell netpoll to queue the frame for later tx
4175 */
4176 if (is_netpoll_tx_blocked(dev))
4177 return NETDEV_TX_BUSY;
4178
4179 read_lock(&bond->lock);
4180
4181 if (bond->slave_cnt)
4182 ret = __bond_start_xmit(skb, dev);
4183 else
4184 kfree_skb(skb);
4185
4186 read_unlock(&bond->lock);
4187
4188 return ret;
4189 }
4190
4191 /*
4192 * set bond mode specific net device operations
4193 */
4194 void bond_set_mode_ops(struct bonding *bond, int mode)
4195 {
4196 struct net_device *bond_dev = bond->dev;
4197
4198 switch (mode) {
4199 case BOND_MODE_ROUNDROBIN:
4200 break;
4201 case BOND_MODE_ACTIVEBACKUP:
4202 break;
4203 case BOND_MODE_XOR:
4204 bond_set_xmit_hash_policy(bond);
4205 break;
4206 case BOND_MODE_BROADCAST:
4207 break;
4208 case BOND_MODE_8023AD:
4209 bond_set_xmit_hash_policy(bond);
4210 break;
4211 case BOND_MODE_ALB:
4212 /* FALLTHRU */
4213 case BOND_MODE_TLB:
4214 break;
4215 default:
4216 /* Should never happen, mode already checked */
4217 pr_err("%s: Error: Unknown bonding mode %d\n",
4218 bond_dev->name, mode);
4219 break;
4220 }
4221 }
4222
4223 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4224 struct ethtool_cmd *ecmd)
4225 {
4226 struct bonding *bond = netdev_priv(bond_dev);
4227 struct slave *slave;
4228 int i;
4229 unsigned long speed = 0;
4230
4231 ecmd->duplex = DUPLEX_UNKNOWN;
4232 ecmd->port = PORT_OTHER;
4233
4234 /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
4235 * do not need to check mode. Though link speed might not represent
4236 * the true receive or transmit bandwidth (not all modes are symmetric)
4237 * this is an accurate maximum.
4238 */
4239 read_lock(&bond->lock);
4240 bond_for_each_slave(bond, slave, i) {
4241 if (SLAVE_IS_OK(slave)) {
4242 if (slave->speed != SPEED_UNKNOWN)
4243 speed += slave->speed;
4244 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4245 slave->duplex != DUPLEX_UNKNOWN)
4246 ecmd->duplex = slave->duplex;
4247 }
4248 }
4249 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4250 read_unlock(&bond->lock);
4251 return 0;
4252 }
4253
4254 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4255 struct ethtool_drvinfo *drvinfo)
4256 {
4257 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4258 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4259 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4260 BOND_ABI_VERSION);
4261 }
4262
4263 static const struct ethtool_ops bond_ethtool_ops = {
4264 .get_drvinfo = bond_ethtool_get_drvinfo,
4265 .get_settings = bond_ethtool_get_settings,
4266 .get_link = ethtool_op_get_link,
4267 };
4268
4269 static const struct net_device_ops bond_netdev_ops = {
4270 .ndo_init = bond_init,
4271 .ndo_uninit = bond_uninit,
4272 .ndo_open = bond_open,
4273 .ndo_stop = bond_close,
4274 .ndo_start_xmit = bond_start_xmit,
4275 .ndo_select_queue = bond_select_queue,
4276 .ndo_get_stats64 = bond_get_stats,
4277 .ndo_do_ioctl = bond_do_ioctl,
4278 .ndo_change_rx_flags = bond_change_rx_flags,
4279 .ndo_set_rx_mode = bond_set_rx_mode,
4280 .ndo_change_mtu = bond_change_mtu,
4281 .ndo_set_mac_address = bond_set_mac_address,
4282 .ndo_neigh_setup = bond_neigh_setup,
4283 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4284 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4285 #ifdef CONFIG_NET_POLL_CONTROLLER
4286 .ndo_netpoll_setup = bond_netpoll_setup,
4287 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4288 .ndo_poll_controller = bond_poll_controller,
4289 #endif
4290 .ndo_add_slave = bond_enslave,
4291 .ndo_del_slave = bond_release,
4292 .ndo_fix_features = bond_fix_features,
4293 };
4294
4295 static const struct device_type bond_type = {
4296 .name = "bond",
4297 };
4298
4299 static void bond_destructor(struct net_device *bond_dev)
4300 {
4301 struct bonding *bond = netdev_priv(bond_dev);
4302 if (bond->wq)
4303 destroy_workqueue(bond->wq);
4304 free_netdev(bond_dev);
4305 }
4306
4307 static void bond_setup(struct net_device *bond_dev)
4308 {
4309 struct bonding *bond = netdev_priv(bond_dev);
4310
4311 /* initialize rwlocks */
4312 rwlock_init(&bond->lock);
4313 rwlock_init(&bond->curr_slave_lock);
4314
4315 bond->params = bonding_defaults;
4316
4317 /* Initialize pointers */
4318 bond->dev = bond_dev;
4319 INIT_LIST_HEAD(&bond->vlan_list);
4320
4321 /* Initialize the device entry points */
4322 ether_setup(bond_dev);
4323 bond_dev->netdev_ops = &bond_netdev_ops;
4324 bond_dev->ethtool_ops = &bond_ethtool_ops;
4325 bond_set_mode_ops(bond, bond->params.mode);
4326
4327 bond_dev->destructor = bond_destructor;
4328
4329 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4330
4331 /* Initialize the device options */
4332 bond_dev->tx_queue_len = 0;
4333 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4334 bond_dev->priv_flags |= IFF_BONDING;
4335 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4336
4337 /* At first, we block adding VLANs. That's the only way to
4338 * prevent problems that occur when adding VLANs over an
4339 * empty bond. The block will be removed once non-challenged
4340 * slaves are enslaved.
4341 */
4342 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4343
4344 /* don't acquire bond device's netif_tx_lock when
4345 * transmitting */
4346 bond_dev->features |= NETIF_F_LLTX;
4347
4348 /* By default, we declare the bond to be fully
4349 * VLAN hardware accelerated capable. Special
4350 * care is taken in the various xmit functions
4351 * when there are slaves that are not hw accel
4352 * capable
4353 */
4354
4355 bond_dev->hw_features = BOND_VLAN_FEATURES |
4356 NETIF_F_HW_VLAN_CTAG_TX |
4357 NETIF_F_HW_VLAN_CTAG_RX |
4358 NETIF_F_HW_VLAN_CTAG_FILTER;
4359
4360 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4361 bond_dev->features |= bond_dev->hw_features;
4362 }
4363
4364 /*
4365 * Destroy a bonding device.
4366 * Must be under rtnl_lock when this function is called.
4367 */
4368 static void bond_uninit(struct net_device *bond_dev)
4369 {
4370 struct bonding *bond = netdev_priv(bond_dev);
4371 struct vlan_entry *vlan, *tmp;
4372
4373 bond_netpoll_cleanup(bond_dev);
4374
4375 /* Release the bonded slaves */
4376 while (bond->first_slave != NULL)
4377 __bond_release_one(bond_dev, bond->first_slave->dev, true);
4378 pr_info("%s: released all slaves\n", bond_dev->name);
4379
4380 list_del(&bond->bond_list);
4381
4382 bond_debug_unregister(bond);
4383
4384 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4385 list_del(&vlan->vlan_list);
4386 kfree(vlan);
4387 }
4388 }
4389
4390 /*------------------------- Module initialization ---------------------------*/
4391
4392 /*
4393 * Convert string input module parms. Accept either the
4394 * number of the mode or its string name. A bit complicated because
4395 * some mode names are substrings of other names, and calls from sysfs
4396 * may have whitespace in the name (trailing newlines, for example).
4397 */
4398 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4399 {
4400 int modeint = -1, i, rv;
4401 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4402
4403 for (p = (char *)buf; *p; p++)
4404 if (!(isdigit(*p) || isspace(*p)))
4405 break;
4406
4407 if (*p)
4408 rv = sscanf(buf, "%20s", modestr);
4409 else
4410 rv = sscanf(buf, "%d", &modeint);
4411
4412 if (!rv)
4413 return -1;
4414
4415 for (i = 0; tbl[i].modename; i++) {
4416 if (modeint == tbl[i].mode)
4417 return tbl[i].mode;
4418 if (strcmp(modestr, tbl[i].modename) == 0)
4419 return tbl[i].mode;
4420 }
4421
4422 return -1;
4423 }
4424
4425 static int bond_check_params(struct bond_params *params)
4426 {
4427 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4428 int arp_all_targets_value;
4429
4430 /*
4431 * Convert string parameters.
4432 */
4433 if (mode) {
4434 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4435 if (bond_mode == -1) {
4436 pr_err("Error: Invalid bonding mode \"%s\"\n",
4437 mode == NULL ? "NULL" : mode);
4438 return -EINVAL;
4439 }
4440 }
4441
4442 if (xmit_hash_policy) {
4443 if ((bond_mode != BOND_MODE_XOR) &&
4444 (bond_mode != BOND_MODE_8023AD)) {
4445 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4446 bond_mode_name(bond_mode));
4447 } else {
4448 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4449 xmit_hashtype_tbl);
4450 if (xmit_hashtype == -1) {
4451 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4452 xmit_hash_policy == NULL ? "NULL" :
4453 xmit_hash_policy);
4454 return -EINVAL;
4455 }
4456 }
4457 }
4458
4459 if (lacp_rate) {
4460 if (bond_mode != BOND_MODE_8023AD) {
4461 pr_info("lacp_rate param is irrelevant in mode %s\n",
4462 bond_mode_name(bond_mode));
4463 } else {
4464 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4465 if (lacp_fast == -1) {
4466 pr_err("Error: Invalid lacp rate \"%s\"\n",
4467 lacp_rate == NULL ? "NULL" : lacp_rate);
4468 return -EINVAL;
4469 }
4470 }
4471 }
4472
4473 if (ad_select) {
4474 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4475 if (params->ad_select == -1) {
4476 pr_err("Error: Invalid ad_select \"%s\"\n",
4477 ad_select == NULL ? "NULL" : ad_select);
4478 return -EINVAL;
4479 }
4480
4481 if (bond_mode != BOND_MODE_8023AD) {
4482 pr_warning("ad_select param only affects 802.3ad mode\n");
4483 }
4484 } else {
4485 params->ad_select = BOND_AD_STABLE;
4486 }
4487
4488 if (max_bonds < 0) {
4489 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4490 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4491 max_bonds = BOND_DEFAULT_MAX_BONDS;
4492 }
4493
4494 if (miimon < 0) {
4495 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4496 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4497 miimon = BOND_LINK_MON_INTERV;
4498 }
4499
4500 if (updelay < 0) {
4501 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4502 updelay, INT_MAX);
4503 updelay = 0;
4504 }
4505
4506 if (downdelay < 0) {
4507 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4508 downdelay, INT_MAX);
4509 downdelay = 0;
4510 }
4511
4512 if ((use_carrier != 0) && (use_carrier != 1)) {
4513 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4514 use_carrier);
4515 use_carrier = 1;
4516 }
4517
4518 if (num_peer_notif < 0 || num_peer_notif > 255) {
4519 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4520 num_peer_notif);
4521 num_peer_notif = 1;
4522 }
4523
4524 /* reset values for 802.3ad */
4525 if (bond_mode == BOND_MODE_8023AD) {
4526 if (!miimon) {
4527 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");
4528 pr_warning("Forcing miimon to 100msec\n");
4529 miimon = 100;
4530 }
4531 }
4532
4533 if (tx_queues < 1 || tx_queues > 255) {
4534 pr_warning("Warning: tx_queues (%d) should be between "
4535 "1 and 255, resetting to %d\n",
4536 tx_queues, BOND_DEFAULT_TX_QUEUES);
4537 tx_queues = BOND_DEFAULT_TX_QUEUES;
4538 }
4539
4540 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4541 pr_warning("Warning: all_slaves_active module parameter (%d), "
4542 "not of valid value (0/1), so it was set to "
4543 "0\n", all_slaves_active);
4544 all_slaves_active = 0;
4545 }
4546
4547 if (resend_igmp < 0 || resend_igmp > 255) {
4548 pr_warning("Warning: resend_igmp (%d) should be between "
4549 "0 and 255, resetting to %d\n",
4550 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4551 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4552 }
4553
4554 /* reset values for TLB/ALB */
4555 if ((bond_mode == BOND_MODE_TLB) ||
4556 (bond_mode == BOND_MODE_ALB)) {
4557 if (!miimon) {
4558 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");
4559 pr_warning("Forcing miimon to 100msec\n");
4560 miimon = 100;
4561 }
4562 }
4563
4564 if (bond_mode == BOND_MODE_ALB) {
4565 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",
4566 updelay);
4567 }
4568
4569 if (!miimon) {
4570 if (updelay || downdelay) {
4571 /* just warn the user the up/down delay will have
4572 * no effect since miimon is zero...
4573 */
4574 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",
4575 updelay, downdelay);
4576 }
4577 } else {
4578 /* don't allow arp monitoring */
4579 if (arp_interval) {
4580 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4581 miimon, arp_interval);
4582 arp_interval = 0;
4583 }
4584
4585 if ((updelay % miimon) != 0) {
4586 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4587 updelay, miimon,
4588 (updelay / miimon) * miimon);
4589 }
4590
4591 updelay /= miimon;
4592
4593 if ((downdelay % miimon) != 0) {
4594 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4595 downdelay, miimon,
4596 (downdelay / miimon) * miimon);
4597 }
4598
4599 downdelay /= miimon;
4600 }
4601
4602 if (arp_interval < 0) {
4603 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4604 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4605 arp_interval = BOND_LINK_ARP_INTERV;
4606 }
4607
4608 for (arp_ip_count = 0, i = 0;
4609 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4610 /* not complete check, but should be good enough to
4611 catch mistakes */
4612 __be32 ip = in_aton(arp_ip_target[i]);
4613 if (!isdigit(arp_ip_target[i][0]) || ip == 0 ||
4614 ip == htonl(INADDR_BROADCAST)) {
4615 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4616 arp_ip_target[i]);
4617 arp_interval = 0;
4618 } else {
4619 if (bond_get_targets_ip(arp_target, ip) == -1)
4620 arp_target[arp_ip_count++] = ip;
4621 else
4622 pr_warning("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4623 &ip);
4624 }
4625 }
4626
4627 if (arp_interval && !arp_ip_count) {
4628 /* don't allow arping if no arp_ip_target given... */
4629 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4630 arp_interval);
4631 arp_interval = 0;
4632 }
4633
4634 if (arp_validate) {
4635 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4636 pr_err("arp_validate only supported in active-backup mode\n");
4637 return -EINVAL;
4638 }
4639 if (!arp_interval) {
4640 pr_err("arp_validate requires arp_interval\n");
4641 return -EINVAL;
4642 }
4643
4644 arp_validate_value = bond_parse_parm(arp_validate,
4645 arp_validate_tbl);
4646 if (arp_validate_value == -1) {
4647 pr_err("Error: invalid arp_validate \"%s\"\n",
4648 arp_validate == NULL ? "NULL" : arp_validate);
4649 return -EINVAL;
4650 }
4651 } else
4652 arp_validate_value = 0;
4653
4654 arp_all_targets_value = 0;
4655 if (arp_all_targets) {
4656 arp_all_targets_value = bond_parse_parm(arp_all_targets,
4657 arp_all_targets_tbl);
4658
4659 if (arp_all_targets_value == -1) {
4660 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4661 arp_all_targets);
4662 arp_all_targets_value = 0;
4663 }
4664 }
4665
4666 if (miimon) {
4667 pr_info("MII link monitoring set to %d ms\n", miimon);
4668 } else if (arp_interval) {
4669 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4670 arp_interval,
4671 arp_validate_tbl[arp_validate_value].modename,
4672 arp_ip_count);
4673
4674 for (i = 0; i < arp_ip_count; i++)
4675 pr_info(" %s", arp_ip_target[i]);
4676
4677 pr_info("\n");
4678
4679 } else if (max_bonds) {
4680 /* miimon and arp_interval not set, we need one so things
4681 * work as expected, see bonding.txt for details
4682 */
4683 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");
4684 }
4685
4686 if (primary && !USES_PRIMARY(bond_mode)) {
4687 /* currently, using a primary only makes sense
4688 * in active backup, TLB or ALB modes
4689 */
4690 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4691 primary, bond_mode_name(bond_mode));
4692 primary = NULL;
4693 }
4694
4695 if (primary && primary_reselect) {
4696 primary_reselect_value = bond_parse_parm(primary_reselect,
4697 pri_reselect_tbl);
4698 if (primary_reselect_value == -1) {
4699 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4700 primary_reselect ==
4701 NULL ? "NULL" : primary_reselect);
4702 return -EINVAL;
4703 }
4704 } else {
4705 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4706 }
4707
4708 if (fail_over_mac) {
4709 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4710 fail_over_mac_tbl);
4711 if (fail_over_mac_value == -1) {
4712 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4713 arp_validate == NULL ? "NULL" : arp_validate);
4714 return -EINVAL;
4715 }
4716
4717 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4718 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4719 } else {
4720 fail_over_mac_value = BOND_FOM_NONE;
4721 }
4722
4723 /* fill params struct with the proper values */
4724 params->mode = bond_mode;
4725 params->xmit_policy = xmit_hashtype;
4726 params->miimon = miimon;
4727 params->num_peer_notif = num_peer_notif;
4728 params->arp_interval = arp_interval;
4729 params->arp_validate = arp_validate_value;
4730 params->arp_all_targets = arp_all_targets_value;
4731 params->updelay = updelay;
4732 params->downdelay = downdelay;
4733 params->use_carrier = use_carrier;
4734 params->lacp_fast = lacp_fast;
4735 params->primary[0] = 0;
4736 params->primary_reselect = primary_reselect_value;
4737 params->fail_over_mac = fail_over_mac_value;
4738 params->tx_queues = tx_queues;
4739 params->all_slaves_active = all_slaves_active;
4740 params->resend_igmp = resend_igmp;
4741 params->min_links = min_links;
4742
4743 if (primary) {
4744 strncpy(params->primary, primary, IFNAMSIZ);
4745 params->primary[IFNAMSIZ - 1] = 0;
4746 }
4747
4748 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4749
4750 return 0;
4751 }
4752
4753 static struct lock_class_key bonding_netdev_xmit_lock_key;
4754 static struct lock_class_key bonding_netdev_addr_lock_key;
4755 static struct lock_class_key bonding_tx_busylock_key;
4756
4757 static void bond_set_lockdep_class_one(struct net_device *dev,
4758 struct netdev_queue *txq,
4759 void *_unused)
4760 {
4761 lockdep_set_class(&txq->_xmit_lock,
4762 &bonding_netdev_xmit_lock_key);
4763 }
4764
4765 static void bond_set_lockdep_class(struct net_device *dev)
4766 {
4767 lockdep_set_class(&dev->addr_list_lock,
4768 &bonding_netdev_addr_lock_key);
4769 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4770 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4771 }
4772
4773 /*
4774 * Called from registration process
4775 */
4776 static int bond_init(struct net_device *bond_dev)
4777 {
4778 struct bonding *bond = netdev_priv(bond_dev);
4779 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4780 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4781
4782 pr_debug("Begin bond_init for %s\n", bond_dev->name);
4783
4784 /*
4785 * Initialize locks that may be required during
4786 * en/deslave operations. All of the bond_open work
4787 * (of which this is part) should really be moved to
4788 * a phase prior to dev_open
4789 */
4790 spin_lock_init(&(bond_info->tx_hashtbl_lock));
4791 spin_lock_init(&(bond_info->rx_hashtbl_lock));
4792
4793 bond->wq = create_singlethread_workqueue(bond_dev->name);
4794 if (!bond->wq)
4795 return -ENOMEM;
4796
4797 bond_set_lockdep_class(bond_dev);
4798
4799 list_add_tail(&bond->bond_list, &bn->dev_list);
4800
4801 bond_prepare_sysfs_group(bond);
4802
4803 bond_debug_register(bond);
4804
4805 /* Ensure valid dev_addr */
4806 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4807 bond_dev->addr_assign_type == NET_ADDR_PERM)
4808 eth_hw_addr_random(bond_dev);
4809
4810 return 0;
4811 }
4812
4813 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4814 {
4815 if (tb[IFLA_ADDRESS]) {
4816 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4817 return -EINVAL;
4818 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4819 return -EADDRNOTAVAIL;
4820 }
4821 return 0;
4822 }
4823
4824 static unsigned int bond_get_num_tx_queues(void)
4825 {
4826 return tx_queues;
4827 }
4828
4829 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4830 .kind = "bond",
4831 .priv_size = sizeof(struct bonding),
4832 .setup = bond_setup,
4833 .validate = bond_validate,
4834 .get_num_tx_queues = bond_get_num_tx_queues,
4835 .get_num_rx_queues = bond_get_num_tx_queues, /* Use the same number
4836 as for TX queues */
4837 };
4838
4839 /* Create a new bond based on the specified name and bonding parameters.
4840 * If name is NULL, obtain a suitable "bond%d" name for us.
4841 * Caller must NOT hold rtnl_lock; we need to release it here before we
4842 * set up our sysfs entries.
4843 */
4844 int bond_create(struct net *net, const char *name)
4845 {
4846 struct net_device *bond_dev;
4847 int res;
4848
4849 rtnl_lock();
4850
4851 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4852 name ? name : "bond%d",
4853 bond_setup, tx_queues);
4854 if (!bond_dev) {
4855 pr_err("%s: eek! can't alloc netdev!\n", name);
4856 rtnl_unlock();
4857 return -ENOMEM;
4858 }
4859
4860 dev_net_set(bond_dev, net);
4861 bond_dev->rtnl_link_ops = &bond_link_ops;
4862
4863 res = register_netdevice(bond_dev);
4864
4865 netif_carrier_off(bond_dev);
4866
4867 rtnl_unlock();
4868 if (res < 0)
4869 bond_destructor(bond_dev);
4870 return res;
4871 }
4872
4873 static int __net_init bond_net_init(struct net *net)
4874 {
4875 struct bond_net *bn = net_generic(net, bond_net_id);
4876
4877 bn->net = net;
4878 INIT_LIST_HEAD(&bn->dev_list);
4879
4880 bond_create_proc_dir(bn);
4881 bond_create_sysfs(bn);
4882
4883 return 0;
4884 }
4885
4886 static void __net_exit bond_net_exit(struct net *net)
4887 {
4888 struct bond_net *bn = net_generic(net, bond_net_id);
4889 struct bonding *bond, *tmp_bond;
4890 LIST_HEAD(list);
4891
4892 bond_destroy_sysfs(bn);
4893 bond_destroy_proc_dir(bn);
4894
4895 /* Kill off any bonds created after unregistering bond rtnl ops */
4896 rtnl_lock();
4897 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4898 unregister_netdevice_queue(bond->dev, &list);
4899 unregister_netdevice_many(&list);
4900 rtnl_unlock();
4901 }
4902
4903 static struct pernet_operations bond_net_ops = {
4904 .init = bond_net_init,
4905 .exit = bond_net_exit,
4906 .id = &bond_net_id,
4907 .size = sizeof(struct bond_net),
4908 };
4909
4910 static int __init bonding_init(void)
4911 {
4912 int i;
4913 int res;
4914
4915 pr_info("%s", bond_version);
4916
4917 res = bond_check_params(&bonding_defaults);
4918 if (res)
4919 goto out;
4920
4921 res = register_pernet_subsys(&bond_net_ops);
4922 if (res)
4923 goto out;
4924
4925 res = rtnl_link_register(&bond_link_ops);
4926 if (res)
4927 goto err_link;
4928
4929 bond_create_debugfs();
4930
4931 for (i = 0; i < max_bonds; i++) {
4932 res = bond_create(&init_net, NULL);
4933 if (res)
4934 goto err;
4935 }
4936
4937 register_netdevice_notifier(&bond_netdev_notifier);
4938 out:
4939 return res;
4940 err:
4941 rtnl_link_unregister(&bond_link_ops);
4942 err_link:
4943 unregister_pernet_subsys(&bond_net_ops);
4944 goto out;
4945
4946 }
4947
4948 static void __exit bonding_exit(void)
4949 {
4950 unregister_netdevice_notifier(&bond_netdev_notifier);
4951
4952 bond_destroy_debugfs();
4953
4954 rtnl_link_unregister(&bond_link_ops);
4955 unregister_pernet_subsys(&bond_net_ops);
4956
4957 #ifdef CONFIG_NET_POLL_CONTROLLER
4958 /*
4959 * Make sure we don't have an imbalance on our netpoll blocking
4960 */
4961 WARN_ON(atomic_read(&netpoll_block_tx));
4962 #endif
4963 }
4964
4965 module_init(bonding_init);
4966 module_exit(bonding_exit);
4967 MODULE_LICENSE("GPL");
4968 MODULE_VERSION(DRV_VERSION);
4969 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4970 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4971 MODULE_ALIAS_RTNL_LINK("bond");
Linus' kernel tree