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Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelv...
[deliverable/linux.git] / drivers / net / bonding / bond_main.c
1 /*
2 * originally based on the dummy device.
3 *
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
6 *
7 * bonding.c: an Ethernet Bonding driver
8 *
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
10 * Cisco 5500
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
13 * Linux Bonding
14 * and probably many L2 switches ...
15 *
16 * How it works:
17 * ifconfig bond0 ipaddress netmask up
18 * will setup a network device, with an ip address. No mac address
19 * will be assigned at this time. The hw mac address will come from
20 * the first slave bonded to the channel. All slaves will then use
21 * this hw mac address.
22 *
23 * ifconfig bond0 down
24 * will release all slaves, marking them as down.
25 *
26 * ifenslave bond0 eth0
27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either
28 * a: be used as initial mac address
29 * b: if a hw mac address already is there, eth0's hw mac address
30 * will then be set from bond0.
31 *
32 */
33
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/fcntl.h>
38 #include <linux/interrupt.h>
39 #include <linux/ptrace.h>
40 #include <linux/ioport.h>
41 #include <linux/in.h>
42 #include <net/ip.h>
43 #include <linux/ip.h>
44 #include <linux/tcp.h>
45 #include <linux/udp.h>
46 #include <linux/slab.h>
47 #include <linux/string.h>
48 #include <linux/init.h>
49 #include <linux/timer.h>
50 #include <linux/socket.h>
51 #include <linux/ctype.h>
52 #include <linux/inet.h>
53 #include <linux/bitops.h>
54 #include <linux/io.h>
55 #include <asm/system.h>
56 #include <asm/dma.h>
57 #include <linux/uaccess.h>
58 #include <linux/errno.h>
59 #include <linux/netdevice.h>
60 #include <linux/inetdevice.h>
61 #include <linux/igmp.h>
62 #include <linux/etherdevice.h>
63 #include <linux/skbuff.h>
64 #include <net/sock.h>
65 #include <linux/rtnetlink.h>
66 #include <linux/proc_fs.h>
67 #include <linux/seq_file.h>
68 #include <linux/smp.h>
69 #include <linux/if_ether.h>
70 #include <net/arp.h>
71 #include <linux/mii.h>
72 #include <linux/ethtool.h>
73 #include <linux/if_vlan.h>
74 #include <linux/if_bonding.h>
75 #include <linux/jiffies.h>
76 #include <net/route.h>
77 #include <net/net_namespace.h>
78 #include "bonding.h"
79 #include "bond_3ad.h"
80 #include "bond_alb.h"
81
82 /*---------------------------- Module parameters ----------------------------*/
83
84 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
85 #define BOND_LINK_MON_INTERV 0
86 #define BOND_LINK_ARP_INTERV 0
87
88 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
89 static int num_grat_arp = 1;
90 static int num_unsol_na = 1;
91 static int miimon = BOND_LINK_MON_INTERV;
92 static int updelay;
93 static int downdelay;
94 static int use_carrier = 1;
95 static char *mode;
96 static char *primary;
97 static char *lacp_rate;
98 static char *ad_select;
99 static char *xmit_hash_policy;
100 static int arp_interval = BOND_LINK_ARP_INTERV;
101 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
102 static char *arp_validate;
103 static char *fail_over_mac;
104 static struct bond_params bonding_defaults;
105
106 module_param(max_bonds, int, 0);
107 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
108 module_param(num_grat_arp, int, 0644);
109 MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
110 module_param(num_unsol_na, int, 0644);
111 MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
112 module_param(miimon, int, 0);
113 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
114 module_param(updelay, int, 0);
115 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
116 module_param(downdelay, int, 0);
117 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
118 "in milliseconds");
119 module_param(use_carrier, int, 0);
120 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
121 "0 for off, 1 for on (default)");
122 module_param(mode, charp, 0);
123 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
124 "1 for active-backup, 2 for balance-xor, "
125 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
126 "6 for balance-alb");
127 module_param(primary, charp, 0);
128 MODULE_PARM_DESC(primary, "Primary network device to use");
129 module_param(lacp_rate, charp, 0);
130 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
131 "(slow/fast)");
132 module_param(ad_select, charp, 0);
133 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
134 module_param(xmit_hash_policy, charp, 0);
135 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
136 ", 1 for layer 3+4");
137 module_param(arp_interval, int, 0);
138 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
139 module_param_array(arp_ip_target, charp, NULL, 0);
140 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
141 module_param(arp_validate, charp, 0);
142 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
143 module_param(fail_over_mac, charp, 0);
144 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC. none (default), active or follow");
145
146 /*----------------------------- Global variables ----------------------------*/
147
148 static const char * const version =
149 DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
150
151 LIST_HEAD(bond_dev_list);
152
153 #ifdef CONFIG_PROC_FS
154 static struct proc_dir_entry *bond_proc_dir;
155 #endif
156
157 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
158 static int arp_ip_count;
159 static int bond_mode = BOND_MODE_ROUNDROBIN;
160 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
161 static int lacp_fast;
162
163
164 const struct bond_parm_tbl bond_lacp_tbl[] = {
165 { "slow", AD_LACP_SLOW},
166 { "fast", AD_LACP_FAST},
167 { NULL, -1},
168 };
169
170 const struct bond_parm_tbl bond_mode_tbl[] = {
171 { "balance-rr", BOND_MODE_ROUNDROBIN},
172 { "active-backup", BOND_MODE_ACTIVEBACKUP},
173 { "balance-xor", BOND_MODE_XOR},
174 { "broadcast", BOND_MODE_BROADCAST},
175 { "802.3ad", BOND_MODE_8023AD},
176 { "balance-tlb", BOND_MODE_TLB},
177 { "balance-alb", BOND_MODE_ALB},
178 { NULL, -1},
179 };
180
181 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
182 { "layer2", BOND_XMIT_POLICY_LAYER2},
183 { "layer3+4", BOND_XMIT_POLICY_LAYER34},
184 { "layer2+3", BOND_XMIT_POLICY_LAYER23},
185 { NULL, -1},
186 };
187
188 const struct bond_parm_tbl arp_validate_tbl[] = {
189 { "none", BOND_ARP_VALIDATE_NONE},
190 { "active", BOND_ARP_VALIDATE_ACTIVE},
191 { "backup", BOND_ARP_VALIDATE_BACKUP},
192 { "all", BOND_ARP_VALIDATE_ALL},
193 { NULL, -1},
194 };
195
196 const struct bond_parm_tbl fail_over_mac_tbl[] = {
197 { "none", BOND_FOM_NONE},
198 { "active", BOND_FOM_ACTIVE},
199 { "follow", BOND_FOM_FOLLOW},
200 { NULL, -1},
201 };
202
203 struct bond_parm_tbl ad_select_tbl[] = {
204 { "stable", BOND_AD_STABLE},
205 { "bandwidth", BOND_AD_BANDWIDTH},
206 { "count", BOND_AD_COUNT},
207 { NULL, -1},
208 };
209
210 /*-------------------------- Forward declarations ---------------------------*/
211
212 static void bond_send_gratuitous_arp(struct bonding *bond);
213 static int bond_init(struct net_device *bond_dev);
214 static void bond_deinit(struct net_device *bond_dev);
215
216 /*---------------------------- General routines -----------------------------*/
217
218 static const char *bond_mode_name(int mode)
219 {
220 static const char *names[] = {
221 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
222 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
223 [BOND_MODE_XOR] = "load balancing (xor)",
224 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
225 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
226 [BOND_MODE_TLB] = "transmit load balancing",
227 [BOND_MODE_ALB] = "adaptive load balancing",
228 };
229
230 if (mode < 0 || mode > BOND_MODE_ALB)
231 return "unknown";
232
233 return names[mode];
234 }
235
236 /*---------------------------------- VLAN -----------------------------------*/
237
238 /**
239 * bond_add_vlan - add a new vlan id on bond
240 * @bond: bond that got the notification
241 * @vlan_id: the vlan id to add
242 *
243 * Returns -ENOMEM if allocation failed.
244 */
245 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
246 {
247 struct vlan_entry *vlan;
248
249 pr_debug("bond: %s, vlan id %d\n",
250 (bond ? bond->dev->name : "None"), vlan_id);
251
252 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
253 if (!vlan)
254 return -ENOMEM;
255
256 INIT_LIST_HEAD(&vlan->vlan_list);
257 vlan->vlan_id = vlan_id;
258
259 write_lock_bh(&bond->lock);
260
261 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
262
263 write_unlock_bh(&bond->lock);
264
265 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
266
267 return 0;
268 }
269
270 /**
271 * bond_del_vlan - delete a vlan id from bond
272 * @bond: bond that got the notification
273 * @vlan_id: the vlan id to delete
274 *
275 * returns -ENODEV if @vlan_id was not found in @bond.
276 */
277 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
278 {
279 struct vlan_entry *vlan;
280 int res = -ENODEV;
281
282 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
283
284 write_lock_bh(&bond->lock);
285
286 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
287 if (vlan->vlan_id == vlan_id) {
288 list_del(&vlan->vlan_list);
289
290 if (bond_is_lb(bond))
291 bond_alb_clear_vlan(bond, vlan_id);
292
293 pr_debug("removed VLAN ID %d from bond %s\n", vlan_id,
294 bond->dev->name);
295
296 kfree(vlan);
297
298 if (list_empty(&bond->vlan_list) &&
299 (bond->slave_cnt == 0)) {
300 /* Last VLAN removed and no slaves, so
301 * restore block on adding VLANs. This will
302 * be removed once new slaves that are not
303 * VLAN challenged will be added.
304 */
305 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
306 }
307
308 res = 0;
309 goto out;
310 }
311 }
312
313 pr_debug("couldn't find VLAN ID %d in bond %s\n", vlan_id,
314 bond->dev->name);
315
316 out:
317 write_unlock_bh(&bond->lock);
318 return res;
319 }
320
321 /**
322 * bond_has_challenged_slaves
323 * @bond: the bond we're working on
324 *
325 * Searches the slave list. Returns 1 if a vlan challenged slave
326 * was found, 0 otherwise.
327 *
328 * Assumes bond->lock is held.
329 */
330 static int bond_has_challenged_slaves(struct bonding *bond)
331 {
332 struct slave *slave;
333 int i;
334
335 bond_for_each_slave(bond, slave, i) {
336 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
337 pr_debug("found VLAN challenged slave - %s\n",
338 slave->dev->name);
339 return 1;
340 }
341 }
342
343 pr_debug("no VLAN challenged slaves found\n");
344 return 0;
345 }
346
347 /**
348 * bond_next_vlan - safely skip to the next item in the vlans list.
349 * @bond: the bond we're working on
350 * @curr: item we're advancing from
351 *
352 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
353 * or @curr->next otherwise (even if it is @curr itself again).
354 *
355 * Caller must hold bond->lock
356 */
357 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
358 {
359 struct vlan_entry *next, *last;
360
361 if (list_empty(&bond->vlan_list))
362 return NULL;
363
364 if (!curr) {
365 next = list_entry(bond->vlan_list.next,
366 struct vlan_entry, vlan_list);
367 } else {
368 last = list_entry(bond->vlan_list.prev,
369 struct vlan_entry, vlan_list);
370 if (last == curr) {
371 next = list_entry(bond->vlan_list.next,
372 struct vlan_entry, vlan_list);
373 } else {
374 next = list_entry(curr->vlan_list.next,
375 struct vlan_entry, vlan_list);
376 }
377 }
378
379 return next;
380 }
381
382 /**
383 * bond_dev_queue_xmit - Prepare skb for xmit.
384 *
385 * @bond: bond device that got this skb for tx.
386 * @skb: hw accel VLAN tagged skb to transmit
387 * @slave_dev: slave that is supposed to xmit this skbuff
388 *
389 * When the bond gets an skb to transmit that is
390 * already hardware accelerated VLAN tagged, and it
391 * needs to relay this skb to a slave that is not
392 * hw accel capable, the skb needs to be "unaccelerated",
393 * i.e. strip the hwaccel tag and re-insert it as part
394 * of the payload.
395 */
396 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
397 struct net_device *slave_dev)
398 {
399 unsigned short uninitialized_var(vlan_id);
400
401 if (!list_empty(&bond->vlan_list) &&
402 !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
403 vlan_get_tag(skb, &vlan_id) == 0) {
404 skb->dev = slave_dev;
405 skb = vlan_put_tag(skb, vlan_id);
406 if (!skb) {
407 /* vlan_put_tag() frees the skb in case of error,
408 * so return success here so the calling functions
409 * won't attempt to free is again.
410 */
411 return 0;
412 }
413 } else {
414 skb->dev = slave_dev;
415 }
416
417 skb->priority = 1;
418 dev_queue_xmit(skb);
419
420 return 0;
421 }
422
423 /*
424 * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
425 * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
426 * lock because:
427 * a. This operation is performed in IOCTL context,
428 * b. The operation is protected by the RTNL semaphore in the 8021q code,
429 * c. Holding a lock with BH disabled while directly calling a base driver
430 * entry point is generally a BAD idea.
431 *
432 * The design of synchronization/protection for this operation in the 8021q
433 * module is good for one or more VLAN devices over a single physical device
434 * and cannot be extended for a teaming solution like bonding, so there is a
435 * potential race condition here where a net device from the vlan group might
436 * be referenced (either by a base driver or the 8021q code) while it is being
437 * removed from the system. However, it turns out we're not making matters
438 * worse, and if it works for regular VLAN usage it will work here too.
439 */
440
441 /**
442 * bond_vlan_rx_register - Propagates registration to slaves
443 * @bond_dev: bonding net device that got called
444 * @grp: vlan group being registered
445 */
446 static void bond_vlan_rx_register(struct net_device *bond_dev,
447 struct vlan_group *grp)
448 {
449 struct bonding *bond = netdev_priv(bond_dev);
450 struct slave *slave;
451 int i;
452
453 bond->vlgrp = grp;
454
455 bond_for_each_slave(bond, slave, i) {
456 struct net_device *slave_dev = slave->dev;
457 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
458
459 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
460 slave_ops->ndo_vlan_rx_register) {
461 slave_ops->ndo_vlan_rx_register(slave_dev, grp);
462 }
463 }
464 }
465
466 /**
467 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
468 * @bond_dev: bonding net device that got called
469 * @vid: vlan id being added
470 */
471 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
472 {
473 struct bonding *bond = netdev_priv(bond_dev);
474 struct slave *slave;
475 int i, res;
476
477 bond_for_each_slave(bond, slave, i) {
478 struct net_device *slave_dev = slave->dev;
479 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
480
481 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
482 slave_ops->ndo_vlan_rx_add_vid) {
483 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
484 }
485 }
486
487 res = bond_add_vlan(bond, vid);
488 if (res) {
489 pr_err(DRV_NAME
490 ": %s: Error: Failed to add vlan id %d\n",
491 bond_dev->name, vid);
492 }
493 }
494
495 /**
496 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
497 * @bond_dev: bonding net device that got called
498 * @vid: vlan id being removed
499 */
500 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
501 {
502 struct bonding *bond = netdev_priv(bond_dev);
503 struct slave *slave;
504 struct net_device *vlan_dev;
505 int i, res;
506
507 bond_for_each_slave(bond, slave, i) {
508 struct net_device *slave_dev = slave->dev;
509 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
510
511 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
512 slave_ops->ndo_vlan_rx_kill_vid) {
513 /* Save and then restore vlan_dev in the grp array,
514 * since the slave's driver might clear it.
515 */
516 vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
517 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
518 vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
519 }
520 }
521
522 res = bond_del_vlan(bond, vid);
523 if (res) {
524 pr_err(DRV_NAME
525 ": %s: Error: Failed to remove vlan id %d\n",
526 bond_dev->name, vid);
527 }
528 }
529
530 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
531 {
532 struct vlan_entry *vlan;
533 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
534
535 write_lock_bh(&bond->lock);
536
537 if (list_empty(&bond->vlan_list))
538 goto out;
539
540 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
541 slave_ops->ndo_vlan_rx_register)
542 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
543
544 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
545 !(slave_ops->ndo_vlan_rx_add_vid))
546 goto out;
547
548 list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
549 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
550
551 out:
552 write_unlock_bh(&bond->lock);
553 }
554
555 static void bond_del_vlans_from_slave(struct bonding *bond,
556 struct net_device *slave_dev)
557 {
558 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
559 struct vlan_entry *vlan;
560 struct net_device *vlan_dev;
561
562 write_lock_bh(&bond->lock);
563
564 if (list_empty(&bond->vlan_list))
565 goto out;
566
567 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
568 !(slave_ops->ndo_vlan_rx_kill_vid))
569 goto unreg;
570
571 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
572 /* Save and then restore vlan_dev in the grp array,
573 * since the slave's driver might clear it.
574 */
575 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
576 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
577 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
578 }
579
580 unreg:
581 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
582 slave_ops->ndo_vlan_rx_register)
583 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
584
585 out:
586 write_unlock_bh(&bond->lock);
587 }
588
589 /*------------------------------- Link status -------------------------------*/
590
591 /*
592 * Set the carrier state for the master according to the state of its
593 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
594 * do special 802.3ad magic.
595 *
596 * Returns zero if carrier state does not change, nonzero if it does.
597 */
598 static int bond_set_carrier(struct bonding *bond)
599 {
600 struct slave *slave;
601 int i;
602
603 if (bond->slave_cnt == 0)
604 goto down;
605
606 if (bond->params.mode == BOND_MODE_8023AD)
607 return bond_3ad_set_carrier(bond);
608
609 bond_for_each_slave(bond, slave, i) {
610 if (slave->link == BOND_LINK_UP) {
611 if (!netif_carrier_ok(bond->dev)) {
612 netif_carrier_on(bond->dev);
613 return 1;
614 }
615 return 0;
616 }
617 }
618
619 down:
620 if (netif_carrier_ok(bond->dev)) {
621 netif_carrier_off(bond->dev);
622 return 1;
623 }
624 return 0;
625 }
626
627 /*
628 * Get link speed and duplex from the slave's base driver
629 * using ethtool. If for some reason the call fails or the
630 * values are invalid, fake speed and duplex to 100/Full
631 * and return error.
632 */
633 static int bond_update_speed_duplex(struct slave *slave)
634 {
635 struct net_device *slave_dev = slave->dev;
636 struct ethtool_cmd etool;
637 int res;
638
639 /* Fake speed and duplex */
640 slave->speed = SPEED_100;
641 slave->duplex = DUPLEX_FULL;
642
643 if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
644 return -1;
645
646 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
647 if (res < 0)
648 return -1;
649
650 switch (etool.speed) {
651 case SPEED_10:
652 case SPEED_100:
653 case SPEED_1000:
654 case SPEED_10000:
655 break;
656 default:
657 return -1;
658 }
659
660 switch (etool.duplex) {
661 case DUPLEX_FULL:
662 case DUPLEX_HALF:
663 break;
664 default:
665 return -1;
666 }
667
668 slave->speed = etool.speed;
669 slave->duplex = etool.duplex;
670
671 return 0;
672 }
673
674 /*
675 * if <dev> supports MII link status reporting, check its link status.
676 *
677 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
678 * depending upon the setting of the use_carrier parameter.
679 *
680 * Return either BMSR_LSTATUS, meaning that the link is up (or we
681 * can't tell and just pretend it is), or 0, meaning that the link is
682 * down.
683 *
684 * If reporting is non-zero, instead of faking link up, return -1 if
685 * both ETHTOOL and MII ioctls fail (meaning the device does not
686 * support them). If use_carrier is set, return whatever it says.
687 * It'd be nice if there was a good way to tell if a driver supports
688 * netif_carrier, but there really isn't.
689 */
690 static int bond_check_dev_link(struct bonding *bond,
691 struct net_device *slave_dev, int reporting)
692 {
693 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
694 static int (*ioctl)(struct net_device *, struct ifreq *, int);
695 struct ifreq ifr;
696 struct mii_ioctl_data *mii;
697
698 if (bond->params.use_carrier)
699 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
700
701 /* Try to get link status using Ethtool first. */
702 if (slave_dev->ethtool_ops) {
703 if (slave_dev->ethtool_ops->get_link) {
704 u32 link;
705
706 link = slave_dev->ethtool_ops->get_link(slave_dev);
707
708 return link ? BMSR_LSTATUS : 0;
709 }
710 }
711
712 /* Ethtool can't be used, fallback to MII ioctls. */
713 ioctl = slave_ops->ndo_do_ioctl;
714 if (ioctl) {
715 /* TODO: set pointer to correct ioctl on a per team member */
716 /* bases to make this more efficient. that is, once */
717 /* we determine the correct ioctl, we will always */
718 /* call it and not the others for that team */
719 /* member. */
720
721 /*
722 * We cannot assume that SIOCGMIIPHY will also read a
723 * register; not all network drivers (e.g., e100)
724 * support that.
725 */
726
727 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
728 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
729 mii = if_mii(&ifr);
730 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
731 mii->reg_num = MII_BMSR;
732 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
733 return mii->val_out & BMSR_LSTATUS;
734 }
735 }
736
737 /*
738 * If reporting, report that either there's no dev->do_ioctl,
739 * or both SIOCGMIIREG and get_link failed (meaning that we
740 * cannot report link status). If not reporting, pretend
741 * we're ok.
742 */
743 return reporting ? -1 : BMSR_LSTATUS;
744 }
745
746 /*----------------------------- Multicast list ------------------------------*/
747
748 /*
749 * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
750 */
751 static inline int bond_is_dmi_same(const struct dev_mc_list *dmi1,
752 const struct dev_mc_list *dmi2)
753 {
754 return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
755 dmi1->dmi_addrlen == dmi2->dmi_addrlen;
756 }
757
758 /*
759 * returns dmi entry if found, NULL otherwise
760 */
761 static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi,
762 struct dev_mc_list *mc_list)
763 {
764 struct dev_mc_list *idmi;
765
766 for (idmi = mc_list; idmi; idmi = idmi->next) {
767 if (bond_is_dmi_same(dmi, idmi))
768 return idmi;
769 }
770
771 return NULL;
772 }
773
774 /*
775 * Push the promiscuity flag down to appropriate slaves
776 */
777 static int bond_set_promiscuity(struct bonding *bond, int inc)
778 {
779 int err = 0;
780 if (USES_PRIMARY(bond->params.mode)) {
781 /* write lock already acquired */
782 if (bond->curr_active_slave) {
783 err = dev_set_promiscuity(bond->curr_active_slave->dev,
784 inc);
785 }
786 } else {
787 struct slave *slave;
788 int i;
789 bond_for_each_slave(bond, slave, i) {
790 err = dev_set_promiscuity(slave->dev, inc);
791 if (err)
792 return err;
793 }
794 }
795 return err;
796 }
797
798 /*
799 * Push the allmulti flag down to all slaves
800 */
801 static int bond_set_allmulti(struct bonding *bond, int inc)
802 {
803 int err = 0;
804 if (USES_PRIMARY(bond->params.mode)) {
805 /* write lock already acquired */
806 if (bond->curr_active_slave) {
807 err = dev_set_allmulti(bond->curr_active_slave->dev,
808 inc);
809 }
810 } else {
811 struct slave *slave;
812 int i;
813 bond_for_each_slave(bond, slave, i) {
814 err = dev_set_allmulti(slave->dev, inc);
815 if (err)
816 return err;
817 }
818 }
819 return err;
820 }
821
822 /*
823 * Add a Multicast address to slaves
824 * according to mode
825 */
826 static void bond_mc_add(struct bonding *bond, void *addr, int alen)
827 {
828 if (USES_PRIMARY(bond->params.mode)) {
829 /* write lock already acquired */
830 if (bond->curr_active_slave)
831 dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
832 } else {
833 struct slave *slave;
834 int i;
835
836 bond_for_each_slave(bond, slave, i)
837 dev_mc_add(slave->dev, addr, alen, 0);
838 }
839 }
840
841 /*
842 * Remove a multicast address from slave
843 * according to mode
844 */
845 static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
846 {
847 if (USES_PRIMARY(bond->params.mode)) {
848 /* write lock already acquired */
849 if (bond->curr_active_slave)
850 dev_mc_delete(bond->curr_active_slave->dev, addr,
851 alen, 0);
852 } else {
853 struct slave *slave;
854 int i;
855 bond_for_each_slave(bond, slave, i) {
856 dev_mc_delete(slave->dev, addr, alen, 0);
857 }
858 }
859 }
860
861
862 /*
863 * Retrieve the list of registered multicast addresses for the bonding
864 * device and retransmit an IGMP JOIN request to the current active
865 * slave.
866 */
867 static void bond_resend_igmp_join_requests(struct bonding *bond)
868 {
869 struct in_device *in_dev;
870 struct ip_mc_list *im;
871
872 rcu_read_lock();
873 in_dev = __in_dev_get_rcu(bond->dev);
874 if (in_dev) {
875 for (im = in_dev->mc_list; im; im = im->next)
876 ip_mc_rejoin_group(im);
877 }
878
879 rcu_read_unlock();
880 }
881
882 /*
883 * Totally destroys the mc_list in bond
884 */
885 static void bond_mc_list_destroy(struct bonding *bond)
886 {
887 struct dev_mc_list *dmi;
888
889 dmi = bond->mc_list;
890 while (dmi) {
891 bond->mc_list = dmi->next;
892 kfree(dmi);
893 dmi = bond->mc_list;
894 }
895
896 bond->mc_list = NULL;
897 }
898
899 /*
900 * Copy all the Multicast addresses from src to the bonding device dst
901 */
902 static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
903 gfp_t gfp_flag)
904 {
905 struct dev_mc_list *dmi, *new_dmi;
906
907 for (dmi = mc_list; dmi; dmi = dmi->next) {
908 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
909
910 if (!new_dmi) {
911 /* FIXME: Potential memory leak !!! */
912 return -ENOMEM;
913 }
914
915 new_dmi->next = bond->mc_list;
916 bond->mc_list = new_dmi;
917 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
918 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
919 new_dmi->dmi_users = dmi->dmi_users;
920 new_dmi->dmi_gusers = dmi->dmi_gusers;
921 }
922
923 return 0;
924 }
925
926 /*
927 * flush all members of flush->mc_list from device dev->mc_list
928 */
929 static void bond_mc_list_flush(struct net_device *bond_dev,
930 struct net_device *slave_dev)
931 {
932 struct bonding *bond = netdev_priv(bond_dev);
933 struct dev_mc_list *dmi;
934
935 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next)
936 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
937
938 if (bond->params.mode == BOND_MODE_8023AD) {
939 /* del lacpdu mc addr from mc list */
940 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
941
942 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
943 }
944 }
945
946 /*--------------------------- Active slave change ---------------------------*/
947
948 /*
949 * Update the mc list and multicast-related flags for the new and
950 * old active slaves (if any) according to the multicast mode, and
951 * promiscuous flags unconditionally.
952 */
953 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
954 struct slave *old_active)
955 {
956 struct dev_mc_list *dmi;
957
958 if (!USES_PRIMARY(bond->params.mode))
959 /* nothing to do - mc list is already up-to-date on
960 * all slaves
961 */
962 return;
963
964 if (old_active) {
965 if (bond->dev->flags & IFF_PROMISC)
966 dev_set_promiscuity(old_active->dev, -1);
967
968 if (bond->dev->flags & IFF_ALLMULTI)
969 dev_set_allmulti(old_active->dev, -1);
970
971 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next)
972 dev_mc_delete(old_active->dev, dmi->dmi_addr,
973 dmi->dmi_addrlen, 0);
974 }
975
976 if (new_active) {
977 /* FIXME: Signal errors upstream. */
978 if (bond->dev->flags & IFF_PROMISC)
979 dev_set_promiscuity(new_active->dev, 1);
980
981 if (bond->dev->flags & IFF_ALLMULTI)
982 dev_set_allmulti(new_active->dev, 1);
983
984 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next)
985 dev_mc_add(new_active->dev, dmi->dmi_addr,
986 dmi->dmi_addrlen, 0);
987 bond_resend_igmp_join_requests(bond);
988 }
989 }
990
991 /*
992 * bond_do_fail_over_mac
993 *
994 * Perform special MAC address swapping for fail_over_mac settings
995 *
996 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
997 */
998 static void bond_do_fail_over_mac(struct bonding *bond,
999 struct slave *new_active,
1000 struct slave *old_active)
1001 __releases(&bond->curr_slave_lock)
1002 __releases(&bond->lock)
1003 __acquires(&bond->lock)
1004 __acquires(&bond->curr_slave_lock)
1005 {
1006 u8 tmp_mac[ETH_ALEN];
1007 struct sockaddr saddr;
1008 int rv;
1009
1010 switch (bond->params.fail_over_mac) {
1011 case BOND_FOM_ACTIVE:
1012 if (new_active)
1013 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
1014 new_active->dev->addr_len);
1015 break;
1016 case BOND_FOM_FOLLOW:
1017 /*
1018 * if new_active && old_active, swap them
1019 * if just old_active, do nothing (going to no active slave)
1020 * if just new_active, set new_active to bond's MAC
1021 */
1022 if (!new_active)
1023 return;
1024
1025 write_unlock_bh(&bond->curr_slave_lock);
1026 read_unlock(&bond->lock);
1027
1028 if (old_active) {
1029 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
1030 memcpy(saddr.sa_data, old_active->dev->dev_addr,
1031 ETH_ALEN);
1032 saddr.sa_family = new_active->dev->type;
1033 } else {
1034 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
1035 saddr.sa_family = bond->dev->type;
1036 }
1037
1038 rv = dev_set_mac_address(new_active->dev, &saddr);
1039 if (rv) {
1040 pr_err(DRV_NAME
1041 ": %s: Error %d setting MAC of slave %s\n",
1042 bond->dev->name, -rv, new_active->dev->name);
1043 goto out;
1044 }
1045
1046 if (!old_active)
1047 goto out;
1048
1049 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1050 saddr.sa_family = old_active->dev->type;
1051
1052 rv = dev_set_mac_address(old_active->dev, &saddr);
1053 if (rv)
1054 pr_err(DRV_NAME
1055 ": %s: Error %d setting MAC of slave %s\n",
1056 bond->dev->name, -rv, new_active->dev->name);
1057 out:
1058 read_lock(&bond->lock);
1059 write_lock_bh(&bond->curr_slave_lock);
1060 break;
1061 default:
1062 pr_err(DRV_NAME
1063 ": %s: bond_do_fail_over_mac impossible: bad policy %d\n",
1064 bond->dev->name, bond->params.fail_over_mac);
1065 break;
1066 }
1067
1068 }
1069
1070
1071 /**
1072 * find_best_interface - select the best available slave to be the active one
1073 * @bond: our bonding struct
1074 *
1075 * Warning: Caller must hold curr_slave_lock for writing.
1076 */
1077 static struct slave *bond_find_best_slave(struct bonding *bond)
1078 {
1079 struct slave *new_active, *old_active;
1080 struct slave *bestslave = NULL;
1081 int mintime = bond->params.updelay;
1082 int i;
1083
1084 new_active = old_active = bond->curr_active_slave;
1085
1086 if (!new_active) { /* there were no active slaves left */
1087 if (bond->slave_cnt > 0) /* found one slave */
1088 new_active = bond->first_slave;
1089 else
1090 return NULL; /* still no slave, return NULL */
1091 }
1092
1093 /*
1094 * first try the primary link; if arping, a link must tx/rx
1095 * traffic before it can be considered the curr_active_slave.
1096 * also, we would skip slaves between the curr_active_slave
1097 * and primary_slave that may be up and able to arp
1098 */
1099 if ((bond->primary_slave) &&
1100 (!bond->params.arp_interval) &&
1101 (IS_UP(bond->primary_slave->dev))) {
1102 new_active = bond->primary_slave;
1103 }
1104
1105 /* remember where to stop iterating over the slaves */
1106 old_active = new_active;
1107
1108 bond_for_each_slave_from(bond, new_active, i, old_active) {
1109 if (IS_UP(new_active->dev)) {
1110 if (new_active->link == BOND_LINK_UP) {
1111 return new_active;
1112 } else if (new_active->link == BOND_LINK_BACK) {
1113 /* link up, but waiting for stabilization */
1114 if (new_active->delay < mintime) {
1115 mintime = new_active->delay;
1116 bestslave = new_active;
1117 }
1118 }
1119 }
1120 }
1121
1122 return bestslave;
1123 }
1124
1125 /**
1126 * change_active_interface - change the active slave into the specified one
1127 * @bond: our bonding struct
1128 * @new: the new slave to make the active one
1129 *
1130 * Set the new slave to the bond's settings and unset them on the old
1131 * curr_active_slave.
1132 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1133 *
1134 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1135 * because it is apparently the best available slave we have, even though its
1136 * updelay hasn't timed out yet.
1137 *
1138 * If new_active is not NULL, caller must hold bond->lock for read and
1139 * curr_slave_lock for write_bh.
1140 */
1141 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1142 {
1143 struct slave *old_active = bond->curr_active_slave;
1144
1145 if (old_active == new_active)
1146 return;
1147
1148 if (new_active) {
1149 new_active->jiffies = jiffies;
1150
1151 if (new_active->link == BOND_LINK_BACK) {
1152 if (USES_PRIMARY(bond->params.mode)) {
1153 pr_info(DRV_NAME
1154 ": %s: making interface %s the new "
1155 "active one %d ms earlier.\n",
1156 bond->dev->name, new_active->dev->name,
1157 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1158 }
1159
1160 new_active->delay = 0;
1161 new_active->link = BOND_LINK_UP;
1162
1163 if (bond->params.mode == BOND_MODE_8023AD)
1164 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1165
1166 if (bond_is_lb(bond))
1167 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1168 } else {
1169 if (USES_PRIMARY(bond->params.mode)) {
1170 pr_info(DRV_NAME
1171 ": %s: making interface %s the new "
1172 "active one.\n",
1173 bond->dev->name, new_active->dev->name);
1174 }
1175 }
1176 }
1177
1178 if (USES_PRIMARY(bond->params.mode))
1179 bond_mc_swap(bond, new_active, old_active);
1180
1181 if (bond_is_lb(bond)) {
1182 bond_alb_handle_active_change(bond, new_active);
1183 if (old_active)
1184 bond_set_slave_inactive_flags(old_active);
1185 if (new_active)
1186 bond_set_slave_active_flags(new_active);
1187 } else {
1188 bond->curr_active_slave = new_active;
1189 }
1190
1191 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1192 if (old_active)
1193 bond_set_slave_inactive_flags(old_active);
1194
1195 if (new_active) {
1196 bond_set_slave_active_flags(new_active);
1197
1198 if (bond->params.fail_over_mac)
1199 bond_do_fail_over_mac(bond, new_active,
1200 old_active);
1201
1202 bond->send_grat_arp = bond->params.num_grat_arp;
1203 bond_send_gratuitous_arp(bond);
1204
1205 bond->send_unsol_na = bond->params.num_unsol_na;
1206 bond_send_unsolicited_na(bond);
1207
1208 write_unlock_bh(&bond->curr_slave_lock);
1209 read_unlock(&bond->lock);
1210
1211 netdev_bonding_change(bond->dev);
1212
1213 read_lock(&bond->lock);
1214 write_lock_bh(&bond->curr_slave_lock);
1215 }
1216 }
1217 }
1218
1219 /**
1220 * bond_select_active_slave - select a new active slave, if needed
1221 * @bond: our bonding struct
1222 *
1223 * This functions should be called when one of the following occurs:
1224 * - The old curr_active_slave has been released or lost its link.
1225 * - The primary_slave has got its link back.
1226 * - A slave has got its link back and there's no old curr_active_slave.
1227 *
1228 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1229 */
1230 void bond_select_active_slave(struct bonding *bond)
1231 {
1232 struct slave *best_slave;
1233 int rv;
1234
1235 best_slave = bond_find_best_slave(bond);
1236 if (best_slave != bond->curr_active_slave) {
1237 bond_change_active_slave(bond, best_slave);
1238 rv = bond_set_carrier(bond);
1239 if (!rv)
1240 return;
1241
1242 if (netif_carrier_ok(bond->dev)) {
1243 pr_info(DRV_NAME
1244 ": %s: first active interface up!\n",
1245 bond->dev->name);
1246 } else {
1247 pr_info(DRV_NAME ": %s: "
1248 "now running without any active interface !\n",
1249 bond->dev->name);
1250 }
1251 }
1252 }
1253
1254 /*--------------------------- slave list handling ---------------------------*/
1255
1256 /*
1257 * This function attaches the slave to the end of list.
1258 *
1259 * bond->lock held for writing by caller.
1260 */
1261 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1262 {
1263 if (bond->first_slave == NULL) { /* attaching the first slave */
1264 new_slave->next = new_slave;
1265 new_slave->prev = new_slave;
1266 bond->first_slave = new_slave;
1267 } else {
1268 new_slave->next = bond->first_slave;
1269 new_slave->prev = bond->first_slave->prev;
1270 new_slave->next->prev = new_slave;
1271 new_slave->prev->next = new_slave;
1272 }
1273
1274 bond->slave_cnt++;
1275 }
1276
1277 /*
1278 * This function detaches the slave from the list.
1279 * WARNING: no check is made to verify if the slave effectively
1280 * belongs to <bond>.
1281 * Nothing is freed on return, structures are just unchained.
1282 * If any slave pointer in bond was pointing to <slave>,
1283 * it should be changed by the calling function.
1284 *
1285 * bond->lock held for writing by caller.
1286 */
1287 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1288 {
1289 if (slave->next)
1290 slave->next->prev = slave->prev;
1291
1292 if (slave->prev)
1293 slave->prev->next = slave->next;
1294
1295 if (bond->first_slave == slave) { /* slave is the first slave */
1296 if (bond->slave_cnt > 1) { /* there are more slave */
1297 bond->first_slave = slave->next;
1298 } else {
1299 bond->first_slave = NULL; /* slave was the last one */
1300 }
1301 }
1302
1303 slave->next = NULL;
1304 slave->prev = NULL;
1305 bond->slave_cnt--;
1306 }
1307
1308 /*---------------------------------- IOCTL ----------------------------------*/
1309
1310 static int bond_sethwaddr(struct net_device *bond_dev,
1311 struct net_device *slave_dev)
1312 {
1313 pr_debug("bond_dev=%p\n", bond_dev);
1314 pr_debug("slave_dev=%p\n", slave_dev);
1315 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1316 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1317 return 0;
1318 }
1319
1320 #define BOND_VLAN_FEATURES \
1321 (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1322 NETIF_F_HW_VLAN_FILTER)
1323
1324 /*
1325 * Compute the common dev->feature set available to all slaves. Some
1326 * feature bits are managed elsewhere, so preserve those feature bits
1327 * on the master device.
1328 */
1329 static int bond_compute_features(struct bonding *bond)
1330 {
1331 struct slave *slave;
1332 struct net_device *bond_dev = bond->dev;
1333 unsigned long features = bond_dev->features;
1334 unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1335 bond_dev->hard_header_len);
1336 int i;
1337
1338 features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1339 features |= NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1340
1341 if (!bond->first_slave)
1342 goto done;
1343
1344 features &= ~NETIF_F_ONE_FOR_ALL;
1345
1346 bond_for_each_slave(bond, slave, i) {
1347 features = netdev_increment_features(features,
1348 slave->dev->features,
1349 NETIF_F_ONE_FOR_ALL);
1350 if (slave->dev->hard_header_len > max_hard_header_len)
1351 max_hard_header_len = slave->dev->hard_header_len;
1352 }
1353
1354 done:
1355 features |= (bond_dev->features & BOND_VLAN_FEATURES);
1356 bond_dev->features = netdev_fix_features(features, NULL);
1357 bond_dev->hard_header_len = max_hard_header_len;
1358
1359 return 0;
1360 }
1361
1362 static void bond_setup_by_slave(struct net_device *bond_dev,
1363 struct net_device *slave_dev)
1364 {
1365 struct bonding *bond = netdev_priv(bond_dev);
1366
1367 bond_dev->header_ops = slave_dev->header_ops;
1368
1369 bond_dev->type = slave_dev->type;
1370 bond_dev->hard_header_len = slave_dev->hard_header_len;
1371 bond_dev->addr_len = slave_dev->addr_len;
1372
1373 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1374 slave_dev->addr_len);
1375 bond->setup_by_slave = 1;
1376 }
1377
1378 /* enslave device <slave> to bond device <master> */
1379 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1380 {
1381 struct bonding *bond = netdev_priv(bond_dev);
1382 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1383 struct slave *new_slave = NULL;
1384 struct dev_mc_list *dmi;
1385 struct sockaddr addr;
1386 int link_reporting;
1387 int old_features = bond_dev->features;
1388 int res = 0;
1389
1390 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1391 slave_ops->ndo_do_ioctl == NULL) {
1392 pr_warning(DRV_NAME
1393 ": %s: Warning: no link monitoring support for %s\n",
1394 bond_dev->name, slave_dev->name);
1395 }
1396
1397 /* bond must be initialized by bond_open() before enslaving */
1398 if (!(bond_dev->flags & IFF_UP)) {
1399 pr_warning(DRV_NAME
1400 " %s: master_dev is not up in bond_enslave\n",
1401 bond_dev->name);
1402 }
1403
1404 /* already enslaved */
1405 if (slave_dev->flags & IFF_SLAVE) {
1406 pr_debug("Error, Device was already enslaved\n");
1407 return -EBUSY;
1408 }
1409
1410 /* vlan challenged mutual exclusion */
1411 /* no need to lock since we're protected by rtnl_lock */
1412 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1413 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1414 if (!list_empty(&bond->vlan_list)) {
1415 pr_err(DRV_NAME
1416 ": %s: Error: cannot enslave VLAN "
1417 "challenged slave %s on VLAN enabled "
1418 "bond %s\n", bond_dev->name, slave_dev->name,
1419 bond_dev->name);
1420 return -EPERM;
1421 } else {
1422 pr_warning(DRV_NAME
1423 ": %s: Warning: enslaved VLAN challenged "
1424 "slave %s. Adding VLANs will be blocked as "
1425 "long as %s is part of bond %s\n",
1426 bond_dev->name, slave_dev->name, slave_dev->name,
1427 bond_dev->name);
1428 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1429 }
1430 } else {
1431 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1432 if (bond->slave_cnt == 0) {
1433 /* First slave, and it is not VLAN challenged,
1434 * so remove the block of adding VLANs over the bond.
1435 */
1436 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1437 }
1438 }
1439
1440 /*
1441 * Old ifenslave binaries are no longer supported. These can
1442 * be identified with moderate accuracy by the state of the slave:
1443 * the current ifenslave will set the interface down prior to
1444 * enslaving it; the old ifenslave will not.
1445 */
1446 if ((slave_dev->flags & IFF_UP)) {
1447 pr_err(DRV_NAME ": %s is up. "
1448 "This may be due to an out of date ifenslave.\n",
1449 slave_dev->name);
1450 res = -EPERM;
1451 goto err_undo_flags;
1452 }
1453
1454 /* set bonding device ether type by slave - bonding netdevices are
1455 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1456 * there is a need to override some of the type dependent attribs/funcs.
1457 *
1458 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1459 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1460 */
1461 if (bond->slave_cnt == 0) {
1462 if (slave_dev->type != ARPHRD_ETHER)
1463 bond_setup_by_slave(bond_dev, slave_dev);
1464 } else if (bond_dev->type != slave_dev->type) {
1465 pr_err(DRV_NAME ": %s ether type (%d) is different "
1466 "from other slaves (%d), can not enslave it.\n",
1467 slave_dev->name,
1468 slave_dev->type, bond_dev->type);
1469 res = -EINVAL;
1470 goto err_undo_flags;
1471 }
1472
1473 if (slave_ops->ndo_set_mac_address == NULL) {
1474 if (bond->slave_cnt == 0) {
1475 pr_warning(DRV_NAME
1476 ": %s: Warning: The first slave device "
1477 "specified does not support setting the MAC "
1478 "address. Setting fail_over_mac to active.",
1479 bond_dev->name);
1480 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1481 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1482 pr_err(DRV_NAME
1483 ": %s: Error: The slave device specified "
1484 "does not support setting the MAC address, "
1485 "but fail_over_mac is not set to active.\n"
1486 , bond_dev->name);
1487 res = -EOPNOTSUPP;
1488 goto err_undo_flags;
1489 }
1490 }
1491
1492 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1493 if (!new_slave) {
1494 res = -ENOMEM;
1495 goto err_undo_flags;
1496 }
1497
1498 /* save slave's original flags before calling
1499 * netdev_set_master and dev_open
1500 */
1501 new_slave->original_flags = slave_dev->flags;
1502
1503 /*
1504 * Save slave's original ("permanent") mac address for modes
1505 * that need it, and for restoring it upon release, and then
1506 * set it to the master's address
1507 */
1508 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1509
1510 if (!bond->params.fail_over_mac) {
1511 /*
1512 * Set slave to master's mac address. The application already
1513 * set the master's mac address to that of the first slave
1514 */
1515 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1516 addr.sa_family = slave_dev->type;
1517 res = dev_set_mac_address(slave_dev, &addr);
1518 if (res) {
1519 pr_debug("Error %d calling set_mac_address\n", res);
1520 goto err_free;
1521 }
1522 }
1523
1524 res = netdev_set_master(slave_dev, bond_dev);
1525 if (res) {
1526 pr_debug("Error %d calling netdev_set_master\n", res);
1527 goto err_restore_mac;
1528 }
1529 /* open the slave since the application closed it */
1530 res = dev_open(slave_dev);
1531 if (res) {
1532 pr_debug("Opening slave %s failed\n", slave_dev->name);
1533 goto err_unset_master;
1534 }
1535
1536 new_slave->dev = slave_dev;
1537 slave_dev->priv_flags |= IFF_BONDING;
1538
1539 if (bond_is_lb(bond)) {
1540 /* bond_alb_init_slave() must be called before all other stages since
1541 * it might fail and we do not want to have to undo everything
1542 */
1543 res = bond_alb_init_slave(bond, new_slave);
1544 if (res)
1545 goto err_close;
1546 }
1547
1548 /* If the mode USES_PRIMARY, then the new slave gets the
1549 * master's promisc (and mc) settings only if it becomes the
1550 * curr_active_slave, and that is taken care of later when calling
1551 * bond_change_active()
1552 */
1553 if (!USES_PRIMARY(bond->params.mode)) {
1554 /* set promiscuity level to new slave */
1555 if (bond_dev->flags & IFF_PROMISC) {
1556 res = dev_set_promiscuity(slave_dev, 1);
1557 if (res)
1558 goto err_close;
1559 }
1560
1561 /* set allmulti level to new slave */
1562 if (bond_dev->flags & IFF_ALLMULTI) {
1563 res = dev_set_allmulti(slave_dev, 1);
1564 if (res)
1565 goto err_close;
1566 }
1567
1568 netif_addr_lock_bh(bond_dev);
1569 /* upload master's mc_list to new slave */
1570 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next)
1571 dev_mc_add(slave_dev, dmi->dmi_addr,
1572 dmi->dmi_addrlen, 0);
1573 netif_addr_unlock_bh(bond_dev);
1574 }
1575
1576 if (bond->params.mode == BOND_MODE_8023AD) {
1577 /* add lacpdu mc addr to mc list */
1578 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1579
1580 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1581 }
1582
1583 bond_add_vlans_on_slave(bond, slave_dev);
1584
1585 write_lock_bh(&bond->lock);
1586
1587 bond_attach_slave(bond, new_slave);
1588
1589 new_slave->delay = 0;
1590 new_slave->link_failure_count = 0;
1591
1592 bond_compute_features(bond);
1593
1594 write_unlock_bh(&bond->lock);
1595
1596 read_lock(&bond->lock);
1597
1598 new_slave->last_arp_rx = jiffies;
1599
1600 if (bond->params.miimon && !bond->params.use_carrier) {
1601 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1602
1603 if ((link_reporting == -1) && !bond->params.arp_interval) {
1604 /*
1605 * miimon is set but a bonded network driver
1606 * does not support ETHTOOL/MII and
1607 * arp_interval is not set. Note: if
1608 * use_carrier is enabled, we will never go
1609 * here (because netif_carrier is always
1610 * supported); thus, we don't need to change
1611 * the messages for netif_carrier.
1612 */
1613 pr_warning(DRV_NAME
1614 ": %s: Warning: MII and ETHTOOL support not "
1615 "available for interface %s, and "
1616 "arp_interval/arp_ip_target module parameters "
1617 "not specified, thus bonding will not detect "
1618 "link failures! see bonding.txt for details.\n",
1619 bond_dev->name, slave_dev->name);
1620 } else if (link_reporting == -1) {
1621 /* unable get link status using mii/ethtool */
1622 pr_warning(DRV_NAME
1623 ": %s: Warning: can't get link status from "
1624 "interface %s; the network driver associated "
1625 "with this interface does not support MII or "
1626 "ETHTOOL link status reporting, thus miimon "
1627 "has no effect on this interface.\n",
1628 bond_dev->name, slave_dev->name);
1629 }
1630 }
1631
1632 /* check for initial state */
1633 if (!bond->params.miimon ||
1634 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1635 if (bond->params.updelay) {
1636 pr_debug("Initial state of slave_dev is "
1637 "BOND_LINK_BACK\n");
1638 new_slave->link = BOND_LINK_BACK;
1639 new_slave->delay = bond->params.updelay;
1640 } else {
1641 pr_debug("Initial state of slave_dev is "
1642 "BOND_LINK_UP\n");
1643 new_slave->link = BOND_LINK_UP;
1644 }
1645 new_slave->jiffies = jiffies;
1646 } else {
1647 pr_debug("Initial state of slave_dev is "
1648 "BOND_LINK_DOWN\n");
1649 new_slave->link = BOND_LINK_DOWN;
1650 }
1651
1652 if (bond_update_speed_duplex(new_slave) &&
1653 (new_slave->link != BOND_LINK_DOWN)) {
1654 pr_warning(DRV_NAME
1655 ": %s: Warning: failed to get speed and duplex from %s, "
1656 "assumed to be 100Mb/sec and Full.\n",
1657 bond_dev->name, new_slave->dev->name);
1658
1659 if (bond->params.mode == BOND_MODE_8023AD) {
1660 pr_warning(DRV_NAME
1661 ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1662 "support in base driver for proper aggregator "
1663 "selection.\n", bond_dev->name);
1664 }
1665 }
1666
1667 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1668 /* if there is a primary slave, remember it */
1669 if (strcmp(bond->params.primary, new_slave->dev->name) == 0)
1670 bond->primary_slave = new_slave;
1671 }
1672
1673 write_lock_bh(&bond->curr_slave_lock);
1674
1675 switch (bond->params.mode) {
1676 case BOND_MODE_ACTIVEBACKUP:
1677 bond_set_slave_inactive_flags(new_slave);
1678 bond_select_active_slave(bond);
1679 break;
1680 case BOND_MODE_8023AD:
1681 /* in 802.3ad mode, the internal mechanism
1682 * will activate the slaves in the selected
1683 * aggregator
1684 */
1685 bond_set_slave_inactive_flags(new_slave);
1686 /* if this is the first slave */
1687 if (bond->slave_cnt == 1) {
1688 SLAVE_AD_INFO(new_slave).id = 1;
1689 /* Initialize AD with the number of times that the AD timer is called in 1 second
1690 * can be called only after the mac address of the bond is set
1691 */
1692 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1693 bond->params.lacp_fast);
1694 } else {
1695 SLAVE_AD_INFO(new_slave).id =
1696 SLAVE_AD_INFO(new_slave->prev).id + 1;
1697 }
1698
1699 bond_3ad_bind_slave(new_slave);
1700 break;
1701 case BOND_MODE_TLB:
1702 case BOND_MODE_ALB:
1703 new_slave->state = BOND_STATE_ACTIVE;
1704 bond_set_slave_inactive_flags(new_slave);
1705 bond_select_active_slave(bond);
1706 break;
1707 default:
1708 pr_debug("This slave is always active in trunk mode\n");
1709
1710 /* always active in trunk mode */
1711 new_slave->state = BOND_STATE_ACTIVE;
1712
1713 /* In trunking mode there is little meaning to curr_active_slave
1714 * anyway (it holds no special properties of the bond device),
1715 * so we can change it without calling change_active_interface()
1716 */
1717 if (!bond->curr_active_slave)
1718 bond->curr_active_slave = new_slave;
1719
1720 break;
1721 } /* switch(bond_mode) */
1722
1723 write_unlock_bh(&bond->curr_slave_lock);
1724
1725 bond_set_carrier(bond);
1726
1727 read_unlock(&bond->lock);
1728
1729 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1730 if (res)
1731 goto err_close;
1732
1733 pr_info(DRV_NAME
1734 ": %s: enslaving %s as a%s interface with a%s link.\n",
1735 bond_dev->name, slave_dev->name,
1736 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1737 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1738
1739 /* enslave is successful */
1740 return 0;
1741
1742 /* Undo stages on error */
1743 err_close:
1744 dev_close(slave_dev);
1745
1746 err_unset_master:
1747 netdev_set_master(slave_dev, NULL);
1748
1749 err_restore_mac:
1750 if (!bond->params.fail_over_mac) {
1751 /* XXX TODO - fom follow mode needs to change master's
1752 * MAC if this slave's MAC is in use by the bond, or at
1753 * least print a warning.
1754 */
1755 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1756 addr.sa_family = slave_dev->type;
1757 dev_set_mac_address(slave_dev, &addr);
1758 }
1759
1760 err_free:
1761 kfree(new_slave);
1762
1763 err_undo_flags:
1764 bond_dev->features = old_features;
1765
1766 return res;
1767 }
1768
1769 /*
1770 * Try to release the slave device <slave> from the bond device <master>
1771 * It is legal to access curr_active_slave without a lock because all the function
1772 * is write-locked.
1773 *
1774 * The rules for slave state should be:
1775 * for Active/Backup:
1776 * Active stays on all backups go down
1777 * for Bonded connections:
1778 * The first up interface should be left on and all others downed.
1779 */
1780 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1781 {
1782 struct bonding *bond = netdev_priv(bond_dev);
1783 struct slave *slave, *oldcurrent;
1784 struct sockaddr addr;
1785 int mac_addr_differ;
1786
1787 /* slave is not a slave or master is not master of this slave */
1788 if (!(slave_dev->flags & IFF_SLAVE) ||
1789 (slave_dev->master != bond_dev)) {
1790 pr_err(DRV_NAME
1791 ": %s: Error: cannot release %s.\n",
1792 bond_dev->name, slave_dev->name);
1793 return -EINVAL;
1794 }
1795
1796 write_lock_bh(&bond->lock);
1797
1798 slave = bond_get_slave_by_dev(bond, slave_dev);
1799 if (!slave) {
1800 /* not a slave of this bond */
1801 pr_info(DRV_NAME
1802 ": %s: %s not enslaved\n",
1803 bond_dev->name, slave_dev->name);
1804 write_unlock_bh(&bond->lock);
1805 return -EINVAL;
1806 }
1807
1808 if (!bond->params.fail_over_mac) {
1809 mac_addr_differ = memcmp(bond_dev->dev_addr, slave->perm_hwaddr,
1810 ETH_ALEN);
1811 if (!mac_addr_differ && (bond->slave_cnt > 1))
1812 pr_warning(DRV_NAME
1813 ": %s: Warning: the permanent HWaddr of %s - "
1814 "%pM - is still in use by %s. "
1815 "Set the HWaddr of %s to a different address "
1816 "to avoid conflicts.\n",
1817 bond_dev->name, slave_dev->name,
1818 slave->perm_hwaddr,
1819 bond_dev->name, slave_dev->name);
1820 }
1821
1822 /* Inform AD package of unbinding of slave. */
1823 if (bond->params.mode == BOND_MODE_8023AD) {
1824 /* must be called before the slave is
1825 * detached from the list
1826 */
1827 bond_3ad_unbind_slave(slave);
1828 }
1829
1830 pr_info(DRV_NAME
1831 ": %s: releasing %s interface %s\n",
1832 bond_dev->name,
1833 (slave->state == BOND_STATE_ACTIVE)
1834 ? "active" : "backup",
1835 slave_dev->name);
1836
1837 oldcurrent = bond->curr_active_slave;
1838
1839 bond->current_arp_slave = NULL;
1840
1841 /* release the slave from its bond */
1842 bond_detach_slave(bond, slave);
1843
1844 bond_compute_features(bond);
1845
1846 if (bond->primary_slave == slave)
1847 bond->primary_slave = NULL;
1848
1849 if (oldcurrent == slave)
1850 bond_change_active_slave(bond, NULL);
1851
1852 if (bond_is_lb(bond)) {
1853 /* Must be called only after the slave has been
1854 * detached from the list and the curr_active_slave
1855 * has been cleared (if our_slave == old_current),
1856 * but before a new active slave is selected.
1857 */
1858 write_unlock_bh(&bond->lock);
1859 bond_alb_deinit_slave(bond, slave);
1860 write_lock_bh(&bond->lock);
1861 }
1862
1863 if (oldcurrent == slave) {
1864 /*
1865 * Note that we hold RTNL over this sequence, so there
1866 * is no concern that another slave add/remove event
1867 * will interfere.
1868 */
1869 write_unlock_bh(&bond->lock);
1870 read_lock(&bond->lock);
1871 write_lock_bh(&bond->curr_slave_lock);
1872
1873 bond_select_active_slave(bond);
1874
1875 write_unlock_bh(&bond->curr_slave_lock);
1876 read_unlock(&bond->lock);
1877 write_lock_bh(&bond->lock);
1878 }
1879
1880 if (bond->slave_cnt == 0) {
1881 bond_set_carrier(bond);
1882
1883 /* if the last slave was removed, zero the mac address
1884 * of the master so it will be set by the application
1885 * to the mac address of the first slave
1886 */
1887 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1888
1889 if (list_empty(&bond->vlan_list)) {
1890 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1891 } else {
1892 pr_warning(DRV_NAME
1893 ": %s: Warning: clearing HW address of %s while it "
1894 "still has VLANs.\n",
1895 bond_dev->name, bond_dev->name);
1896 pr_warning(DRV_NAME
1897 ": %s: When re-adding slaves, make sure the bond's "
1898 "HW address matches its VLANs'.\n",
1899 bond_dev->name);
1900 }
1901 } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1902 !bond_has_challenged_slaves(bond)) {
1903 pr_info(DRV_NAME
1904 ": %s: last VLAN challenged slave %s "
1905 "left bond %s. VLAN blocking is removed\n",
1906 bond_dev->name, slave_dev->name, bond_dev->name);
1907 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1908 }
1909
1910 write_unlock_bh(&bond->lock);
1911
1912 /* must do this from outside any spinlocks */
1913 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1914
1915 bond_del_vlans_from_slave(bond, slave_dev);
1916
1917 /* If the mode USES_PRIMARY, then we should only remove its
1918 * promisc and mc settings if it was the curr_active_slave, but that was
1919 * already taken care of above when we detached the slave
1920 */
1921 if (!USES_PRIMARY(bond->params.mode)) {
1922 /* unset promiscuity level from slave */
1923 if (bond_dev->flags & IFF_PROMISC)
1924 dev_set_promiscuity(slave_dev, -1);
1925
1926 /* unset allmulti level from slave */
1927 if (bond_dev->flags & IFF_ALLMULTI)
1928 dev_set_allmulti(slave_dev, -1);
1929
1930 /* flush master's mc_list from slave */
1931 netif_addr_lock_bh(bond_dev);
1932 bond_mc_list_flush(bond_dev, slave_dev);
1933 netif_addr_unlock_bh(bond_dev);
1934 }
1935
1936 netdev_set_master(slave_dev, NULL);
1937
1938 /* close slave before restoring its mac address */
1939 dev_close(slave_dev);
1940
1941 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1942 /* restore original ("permanent") mac address */
1943 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1944 addr.sa_family = slave_dev->type;
1945 dev_set_mac_address(slave_dev, &addr);
1946 }
1947
1948 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1949 IFF_SLAVE_INACTIVE | IFF_BONDING |
1950 IFF_SLAVE_NEEDARP);
1951
1952 kfree(slave);
1953
1954 return 0; /* deletion OK */
1955 }
1956
1957 /*
1958 * Destroy a bonding device.
1959 * Must be under rtnl_lock when this function is called.
1960 */
1961 static void bond_uninit(struct net_device *bond_dev)
1962 {
1963 struct bonding *bond = netdev_priv(bond_dev);
1964
1965 bond_deinit(bond_dev);
1966 bond_destroy_sysfs_entry(bond);
1967
1968 if (bond->wq)
1969 destroy_workqueue(bond->wq);
1970
1971 netif_addr_lock_bh(bond_dev);
1972 bond_mc_list_destroy(bond);
1973 netif_addr_unlock_bh(bond_dev);
1974 }
1975
1976 /*
1977 * First release a slave and than destroy the bond if no more slaves are left.
1978 * Must be under rtnl_lock when this function is called.
1979 */
1980 int bond_release_and_destroy(struct net_device *bond_dev,
1981 struct net_device *slave_dev)
1982 {
1983 struct bonding *bond = netdev_priv(bond_dev);
1984 int ret;
1985
1986 ret = bond_release(bond_dev, slave_dev);
1987 if ((ret == 0) && (bond->slave_cnt == 0)) {
1988 pr_info(DRV_NAME ": %s: destroying bond %s.\n",
1989 bond_dev->name, bond_dev->name);
1990 unregister_netdevice(bond_dev);
1991 }
1992 return ret;
1993 }
1994
1995 /*
1996 * This function releases all slaves.
1997 */
1998 static int bond_release_all(struct net_device *bond_dev)
1999 {
2000 struct bonding *bond = netdev_priv(bond_dev);
2001 struct slave *slave;
2002 struct net_device *slave_dev;
2003 struct sockaddr addr;
2004
2005 write_lock_bh(&bond->lock);
2006
2007 netif_carrier_off(bond_dev);
2008
2009 if (bond->slave_cnt == 0)
2010 goto out;
2011
2012 bond->current_arp_slave = NULL;
2013 bond->primary_slave = NULL;
2014 bond_change_active_slave(bond, NULL);
2015
2016 while ((slave = bond->first_slave) != NULL) {
2017 /* Inform AD package of unbinding of slave
2018 * before slave is detached from the list.
2019 */
2020 if (bond->params.mode == BOND_MODE_8023AD)
2021 bond_3ad_unbind_slave(slave);
2022
2023 slave_dev = slave->dev;
2024 bond_detach_slave(bond, slave);
2025
2026 /* now that the slave is detached, unlock and perform
2027 * all the undo steps that should not be called from
2028 * within a lock.
2029 */
2030 write_unlock_bh(&bond->lock);
2031
2032 if (bond_is_lb(bond)) {
2033 /* must be called only after the slave
2034 * has been detached from the list
2035 */
2036 bond_alb_deinit_slave(bond, slave);
2037 }
2038
2039 bond_compute_features(bond);
2040
2041 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2042 bond_del_vlans_from_slave(bond, slave_dev);
2043
2044 /* If the mode USES_PRIMARY, then we should only remove its
2045 * promisc and mc settings if it was the curr_active_slave, but that was
2046 * already taken care of above when we detached the slave
2047 */
2048 if (!USES_PRIMARY(bond->params.mode)) {
2049 /* unset promiscuity level from slave */
2050 if (bond_dev->flags & IFF_PROMISC)
2051 dev_set_promiscuity(slave_dev, -1);
2052
2053 /* unset allmulti level from slave */
2054 if (bond_dev->flags & IFF_ALLMULTI)
2055 dev_set_allmulti(slave_dev, -1);
2056
2057 /* flush master's mc_list from slave */
2058 netif_addr_lock_bh(bond_dev);
2059 bond_mc_list_flush(bond_dev, slave_dev);
2060 netif_addr_unlock_bh(bond_dev);
2061 }
2062
2063 netdev_set_master(slave_dev, NULL);
2064
2065 /* close slave before restoring its mac address */
2066 dev_close(slave_dev);
2067
2068 if (!bond->params.fail_over_mac) {
2069 /* restore original ("permanent") mac address*/
2070 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2071 addr.sa_family = slave_dev->type;
2072 dev_set_mac_address(slave_dev, &addr);
2073 }
2074
2075 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2076 IFF_SLAVE_INACTIVE);
2077
2078 kfree(slave);
2079
2080 /* re-acquire the lock before getting the next slave */
2081 write_lock_bh(&bond->lock);
2082 }
2083
2084 /* zero the mac address of the master so it will be
2085 * set by the application to the mac address of the
2086 * first slave
2087 */
2088 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2089
2090 if (list_empty(&bond->vlan_list))
2091 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2092 else {
2093 pr_warning(DRV_NAME
2094 ": %s: Warning: clearing HW address of %s while it "
2095 "still has VLANs.\n",
2096 bond_dev->name, bond_dev->name);
2097 pr_warning(DRV_NAME
2098 ": %s: When re-adding slaves, make sure the bond's "
2099 "HW address matches its VLANs'.\n",
2100 bond_dev->name);
2101 }
2102
2103 pr_info(DRV_NAME
2104 ": %s: released all slaves\n",
2105 bond_dev->name);
2106
2107 out:
2108 write_unlock_bh(&bond->lock);
2109
2110 return 0;
2111 }
2112
2113 /*
2114 * This function changes the active slave to slave <slave_dev>.
2115 * It returns -EINVAL in the following cases.
2116 * - <slave_dev> is not found in the list.
2117 * - There is not active slave now.
2118 * - <slave_dev> is already active.
2119 * - The link state of <slave_dev> is not BOND_LINK_UP.
2120 * - <slave_dev> is not running.
2121 * In these cases, this function does nothing.
2122 * In the other cases, current_slave pointer is changed and 0 is returned.
2123 */
2124 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2125 {
2126 struct bonding *bond = netdev_priv(bond_dev);
2127 struct slave *old_active = NULL;
2128 struct slave *new_active = NULL;
2129 int res = 0;
2130
2131 if (!USES_PRIMARY(bond->params.mode))
2132 return -EINVAL;
2133
2134 /* Verify that master_dev is indeed the master of slave_dev */
2135 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2136 return -EINVAL;
2137
2138 read_lock(&bond->lock);
2139
2140 read_lock(&bond->curr_slave_lock);
2141 old_active = bond->curr_active_slave;
2142 read_unlock(&bond->curr_slave_lock);
2143
2144 new_active = bond_get_slave_by_dev(bond, slave_dev);
2145
2146 /*
2147 * Changing to the current active: do nothing; return success.
2148 */
2149 if (new_active && (new_active == old_active)) {
2150 read_unlock(&bond->lock);
2151 return 0;
2152 }
2153
2154 if ((new_active) &&
2155 (old_active) &&
2156 (new_active->link == BOND_LINK_UP) &&
2157 IS_UP(new_active->dev)) {
2158 write_lock_bh(&bond->curr_slave_lock);
2159 bond_change_active_slave(bond, new_active);
2160 write_unlock_bh(&bond->curr_slave_lock);
2161 } else
2162 res = -EINVAL;
2163
2164 read_unlock(&bond->lock);
2165
2166 return res;
2167 }
2168
2169 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2170 {
2171 struct bonding *bond = netdev_priv(bond_dev);
2172
2173 info->bond_mode = bond->params.mode;
2174 info->miimon = bond->params.miimon;
2175
2176 read_lock(&bond->lock);
2177 info->num_slaves = bond->slave_cnt;
2178 read_unlock(&bond->lock);
2179
2180 return 0;
2181 }
2182
2183 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2184 {
2185 struct bonding *bond = netdev_priv(bond_dev);
2186 struct slave *slave;
2187 int i, res = -ENODEV;
2188
2189 read_lock(&bond->lock);
2190
2191 bond_for_each_slave(bond, slave, i) {
2192 if (i == (int)info->slave_id) {
2193 res = 0;
2194 strcpy(info->slave_name, slave->dev->name);
2195 info->link = slave->link;
2196 info->state = slave->state;
2197 info->link_failure_count = slave->link_failure_count;
2198 break;
2199 }
2200 }
2201
2202 read_unlock(&bond->lock);
2203
2204 return res;
2205 }
2206
2207 /*-------------------------------- Monitoring -------------------------------*/
2208
2209
2210 static int bond_miimon_inspect(struct bonding *bond)
2211 {
2212 struct slave *slave;
2213 int i, link_state, commit = 0;
2214 bool ignore_updelay;
2215
2216 ignore_updelay = !bond->curr_active_slave ? true : false;
2217
2218 bond_for_each_slave(bond, slave, i) {
2219 slave->new_link = BOND_LINK_NOCHANGE;
2220
2221 link_state = bond_check_dev_link(bond, slave->dev, 0);
2222
2223 switch (slave->link) {
2224 case BOND_LINK_UP:
2225 if (link_state)
2226 continue;
2227
2228 slave->link = BOND_LINK_FAIL;
2229 slave->delay = bond->params.downdelay;
2230 if (slave->delay) {
2231 pr_info(DRV_NAME
2232 ": %s: link status down for %s"
2233 "interface %s, disabling it in %d ms.\n",
2234 bond->dev->name,
2235 (bond->params.mode ==
2236 BOND_MODE_ACTIVEBACKUP) ?
2237 ((slave->state == BOND_STATE_ACTIVE) ?
2238 "active " : "backup ") : "",
2239 slave->dev->name,
2240 bond->params.downdelay * bond->params.miimon);
2241 }
2242 /*FALLTHRU*/
2243 case BOND_LINK_FAIL:
2244 if (link_state) {
2245 /*
2246 * recovered before downdelay expired
2247 */
2248 slave->link = BOND_LINK_UP;
2249 slave->jiffies = jiffies;
2250 pr_info(DRV_NAME
2251 ": %s: link status up again after %d "
2252 "ms for interface %s.\n",
2253 bond->dev->name,
2254 (bond->params.downdelay - slave->delay) *
2255 bond->params.miimon,
2256 slave->dev->name);
2257 continue;
2258 }
2259
2260 if (slave->delay <= 0) {
2261 slave->new_link = BOND_LINK_DOWN;
2262 commit++;
2263 continue;
2264 }
2265
2266 slave->delay--;
2267 break;
2268
2269 case BOND_LINK_DOWN:
2270 if (!link_state)
2271 continue;
2272
2273 slave->link = BOND_LINK_BACK;
2274 slave->delay = bond->params.updelay;
2275
2276 if (slave->delay) {
2277 pr_info(DRV_NAME
2278 ": %s: link status up for "
2279 "interface %s, enabling it in %d ms.\n",
2280 bond->dev->name, slave->dev->name,
2281 ignore_updelay ? 0 :
2282 bond->params.updelay *
2283 bond->params.miimon);
2284 }
2285 /*FALLTHRU*/
2286 case BOND_LINK_BACK:
2287 if (!link_state) {
2288 slave->link = BOND_LINK_DOWN;
2289 pr_info(DRV_NAME
2290 ": %s: link status down again after %d "
2291 "ms for interface %s.\n",
2292 bond->dev->name,
2293 (bond->params.updelay - slave->delay) *
2294 bond->params.miimon,
2295 slave->dev->name);
2296
2297 continue;
2298 }
2299
2300 if (ignore_updelay)
2301 slave->delay = 0;
2302
2303 if (slave->delay <= 0) {
2304 slave->new_link = BOND_LINK_UP;
2305 commit++;
2306 ignore_updelay = false;
2307 continue;
2308 }
2309
2310 slave->delay--;
2311 break;
2312 }
2313 }
2314
2315 return commit;
2316 }
2317
2318 static void bond_miimon_commit(struct bonding *bond)
2319 {
2320 struct slave *slave;
2321 int i;
2322
2323 bond_for_each_slave(bond, slave, i) {
2324 switch (slave->new_link) {
2325 case BOND_LINK_NOCHANGE:
2326 continue;
2327
2328 case BOND_LINK_UP:
2329 slave->link = BOND_LINK_UP;
2330 slave->jiffies = jiffies;
2331
2332 if (bond->params.mode == BOND_MODE_8023AD) {
2333 /* prevent it from being the active one */
2334 slave->state = BOND_STATE_BACKUP;
2335 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2336 /* make it immediately active */
2337 slave->state = BOND_STATE_ACTIVE;
2338 } else if (slave != bond->primary_slave) {
2339 /* prevent it from being the active one */
2340 slave->state = BOND_STATE_BACKUP;
2341 }
2342
2343 pr_info(DRV_NAME
2344 ": %s: link status definitely "
2345 "up for interface %s.\n",
2346 bond->dev->name, slave->dev->name);
2347
2348 /* notify ad that the link status has changed */
2349 if (bond->params.mode == BOND_MODE_8023AD)
2350 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2351
2352 if (bond_is_lb(bond))
2353 bond_alb_handle_link_change(bond, slave,
2354 BOND_LINK_UP);
2355
2356 if (!bond->curr_active_slave ||
2357 (slave == bond->primary_slave))
2358 goto do_failover;
2359
2360 continue;
2361
2362 case BOND_LINK_DOWN:
2363 if (slave->link_failure_count < UINT_MAX)
2364 slave->link_failure_count++;
2365
2366 slave->link = BOND_LINK_DOWN;
2367
2368 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2369 bond->params.mode == BOND_MODE_8023AD)
2370 bond_set_slave_inactive_flags(slave);
2371
2372 pr_info(DRV_NAME
2373 ": %s: link status definitely down for "
2374 "interface %s, disabling it\n",
2375 bond->dev->name, slave->dev->name);
2376
2377 if (bond->params.mode == BOND_MODE_8023AD)
2378 bond_3ad_handle_link_change(slave,
2379 BOND_LINK_DOWN);
2380
2381 if (bond_is_lb(bond))
2382 bond_alb_handle_link_change(bond, slave,
2383 BOND_LINK_DOWN);
2384
2385 if (slave == bond->curr_active_slave)
2386 goto do_failover;
2387
2388 continue;
2389
2390 default:
2391 pr_err(DRV_NAME
2392 ": %s: invalid new link %d on slave %s\n",
2393 bond->dev->name, slave->new_link,
2394 slave->dev->name);
2395 slave->new_link = BOND_LINK_NOCHANGE;
2396
2397 continue;
2398 }
2399
2400 do_failover:
2401 ASSERT_RTNL();
2402 write_lock_bh(&bond->curr_slave_lock);
2403 bond_select_active_slave(bond);
2404 write_unlock_bh(&bond->curr_slave_lock);
2405 }
2406
2407 bond_set_carrier(bond);
2408 }
2409
2410 /*
2411 * bond_mii_monitor
2412 *
2413 * Really a wrapper that splits the mii monitor into two phases: an
2414 * inspection, then (if inspection indicates something needs to be done)
2415 * an acquisition of appropriate locks followed by a commit phase to
2416 * implement whatever link state changes are indicated.
2417 */
2418 void bond_mii_monitor(struct work_struct *work)
2419 {
2420 struct bonding *bond = container_of(work, struct bonding,
2421 mii_work.work);
2422
2423 read_lock(&bond->lock);
2424 if (bond->kill_timers)
2425 goto out;
2426
2427 if (bond->slave_cnt == 0)
2428 goto re_arm;
2429
2430 if (bond->send_grat_arp) {
2431 read_lock(&bond->curr_slave_lock);
2432 bond_send_gratuitous_arp(bond);
2433 read_unlock(&bond->curr_slave_lock);
2434 }
2435
2436 if (bond->send_unsol_na) {
2437 read_lock(&bond->curr_slave_lock);
2438 bond_send_unsolicited_na(bond);
2439 read_unlock(&bond->curr_slave_lock);
2440 }
2441
2442 if (bond_miimon_inspect(bond)) {
2443 read_unlock(&bond->lock);
2444 rtnl_lock();
2445 read_lock(&bond->lock);
2446
2447 bond_miimon_commit(bond);
2448
2449 read_unlock(&bond->lock);
2450 rtnl_unlock(); /* might sleep, hold no other locks */
2451 read_lock(&bond->lock);
2452 }
2453
2454 re_arm:
2455 if (bond->params.miimon)
2456 queue_delayed_work(bond->wq, &bond->mii_work,
2457 msecs_to_jiffies(bond->params.miimon));
2458 out:
2459 read_unlock(&bond->lock);
2460 }
2461
2462 static __be32 bond_glean_dev_ip(struct net_device *dev)
2463 {
2464 struct in_device *idev;
2465 struct in_ifaddr *ifa;
2466 __be32 addr = 0;
2467
2468 if (!dev)
2469 return 0;
2470
2471 rcu_read_lock();
2472 idev = __in_dev_get_rcu(dev);
2473 if (!idev)
2474 goto out;
2475
2476 ifa = idev->ifa_list;
2477 if (!ifa)
2478 goto out;
2479
2480 addr = ifa->ifa_local;
2481 out:
2482 rcu_read_unlock();
2483 return addr;
2484 }
2485
2486 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2487 {
2488 struct vlan_entry *vlan;
2489
2490 if (ip == bond->master_ip)
2491 return 1;
2492
2493 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2494 if (ip == vlan->vlan_ip)
2495 return 1;
2496 }
2497
2498 return 0;
2499 }
2500
2501 /*
2502 * We go to the (large) trouble of VLAN tagging ARP frames because
2503 * switches in VLAN mode (especially if ports are configured as
2504 * "native" to a VLAN) might not pass non-tagged frames.
2505 */
2506 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2507 {
2508 struct sk_buff *skb;
2509
2510 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2511 slave_dev->name, dest_ip, src_ip, vlan_id);
2512
2513 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2514 NULL, slave_dev->dev_addr, NULL);
2515
2516 if (!skb) {
2517 pr_err(DRV_NAME ": ARP packet allocation failed\n");
2518 return;
2519 }
2520 if (vlan_id) {
2521 skb = vlan_put_tag(skb, vlan_id);
2522 if (!skb) {
2523 pr_err(DRV_NAME ": failed to insert VLAN tag\n");
2524 return;
2525 }
2526 }
2527 arp_xmit(skb);
2528 }
2529
2530
2531 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2532 {
2533 int i, vlan_id, rv;
2534 __be32 *targets = bond->params.arp_targets;
2535 struct vlan_entry *vlan;
2536 struct net_device *vlan_dev;
2537 struct flowi fl;
2538 struct rtable *rt;
2539
2540 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2541 if (!targets[i])
2542 break;
2543 pr_debug("basa: target %x\n", targets[i]);
2544 if (list_empty(&bond->vlan_list)) {
2545 pr_debug("basa: empty vlan: arp_send\n");
2546 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2547 bond->master_ip, 0);
2548 continue;
2549 }
2550
2551 /*
2552 * If VLANs are configured, we do a route lookup to
2553 * determine which VLAN interface would be used, so we
2554 * can tag the ARP with the proper VLAN tag.
2555 */
2556 memset(&fl, 0, sizeof(fl));
2557 fl.fl4_dst = targets[i];
2558 fl.fl4_tos = RTO_ONLINK;
2559
2560 rv = ip_route_output_key(&init_net, &rt, &fl);
2561 if (rv) {
2562 if (net_ratelimit()) {
2563 pr_warning(DRV_NAME
2564 ": %s: no route to arp_ip_target %pI4\n",
2565 bond->dev->name, &fl.fl4_dst);
2566 }
2567 continue;
2568 }
2569
2570 /*
2571 * This target is not on a VLAN
2572 */
2573 if (rt->u.dst.dev == bond->dev) {
2574 ip_rt_put(rt);
2575 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2576 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2577 bond->master_ip, 0);
2578 continue;
2579 }
2580
2581 vlan_id = 0;
2582 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2583 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2584 if (vlan_dev == rt->u.dst.dev) {
2585 vlan_id = vlan->vlan_id;
2586 pr_debug("basa: vlan match on %s %d\n",
2587 vlan_dev->name, vlan_id);
2588 break;
2589 }
2590 }
2591
2592 if (vlan_id) {
2593 ip_rt_put(rt);
2594 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2595 vlan->vlan_ip, vlan_id);
2596 continue;
2597 }
2598
2599 if (net_ratelimit()) {
2600 pr_warning(DRV_NAME
2601 ": %s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2602 bond->dev->name, &fl.fl4_dst,
2603 rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2604 }
2605 ip_rt_put(rt);
2606 }
2607 }
2608
2609 /*
2610 * Kick out a gratuitous ARP for an IP on the bonding master plus one
2611 * for each VLAN above us.
2612 *
2613 * Caller must hold curr_slave_lock for read or better
2614 */
2615 static void bond_send_gratuitous_arp(struct bonding *bond)
2616 {
2617 struct slave *slave = bond->curr_active_slave;
2618 struct vlan_entry *vlan;
2619 struct net_device *vlan_dev;
2620
2621 pr_debug("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2622 slave ? slave->dev->name : "NULL");
2623
2624 if (!slave || !bond->send_grat_arp ||
2625 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2626 return;
2627
2628 bond->send_grat_arp--;
2629
2630 if (bond->master_ip) {
2631 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2632 bond->master_ip, 0);
2633 }
2634
2635 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2636 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2637 if (vlan->vlan_ip) {
2638 bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2639 vlan->vlan_ip, vlan->vlan_id);
2640 }
2641 }
2642 }
2643
2644 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2645 {
2646 int i;
2647 __be32 *targets = bond->params.arp_targets;
2648
2649 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2650 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2651 &sip, &tip, i, &targets[i], bond_has_this_ip(bond, tip));
2652 if (sip == targets[i]) {
2653 if (bond_has_this_ip(bond, tip))
2654 slave->last_arp_rx = jiffies;
2655 return;
2656 }
2657 }
2658 }
2659
2660 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2661 {
2662 struct arphdr *arp;
2663 struct slave *slave;
2664 struct bonding *bond;
2665 unsigned char *arp_ptr;
2666 __be32 sip, tip;
2667
2668 if (dev_net(dev) != &init_net)
2669 goto out;
2670
2671 if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2672 goto out;
2673
2674 bond = netdev_priv(dev);
2675 read_lock(&bond->lock);
2676
2677 pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2678 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2679 orig_dev ? orig_dev->name : "NULL");
2680
2681 slave = bond_get_slave_by_dev(bond, orig_dev);
2682 if (!slave || !slave_do_arp_validate(bond, slave))
2683 goto out_unlock;
2684
2685 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2686 goto out_unlock;
2687
2688 arp = arp_hdr(skb);
2689 if (arp->ar_hln != dev->addr_len ||
2690 skb->pkt_type == PACKET_OTHERHOST ||
2691 skb->pkt_type == PACKET_LOOPBACK ||
2692 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2693 arp->ar_pro != htons(ETH_P_IP) ||
2694 arp->ar_pln != 4)
2695 goto out_unlock;
2696
2697 arp_ptr = (unsigned char *)(arp + 1);
2698 arp_ptr += dev->addr_len;
2699 memcpy(&sip, arp_ptr, 4);
2700 arp_ptr += 4 + dev->addr_len;
2701 memcpy(&tip, arp_ptr, 4);
2702
2703 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2704 bond->dev->name, slave->dev->name, slave->state,
2705 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2706 &sip, &tip);
2707
2708 /*
2709 * Backup slaves won't see the ARP reply, but do come through
2710 * here for each ARP probe (so we swap the sip/tip to validate
2711 * the probe). In a "redundant switch, common router" type of
2712 * configuration, the ARP probe will (hopefully) travel from
2713 * the active, through one switch, the router, then the other
2714 * switch before reaching the backup.
2715 */
2716 if (slave->state == BOND_STATE_ACTIVE)
2717 bond_validate_arp(bond, slave, sip, tip);
2718 else
2719 bond_validate_arp(bond, slave, tip, sip);
2720
2721 out_unlock:
2722 read_unlock(&bond->lock);
2723 out:
2724 dev_kfree_skb(skb);
2725 return NET_RX_SUCCESS;
2726 }
2727
2728 /*
2729 * this function is called regularly to monitor each slave's link
2730 * ensuring that traffic is being sent and received when arp monitoring
2731 * is used in load-balancing mode. if the adapter has been dormant, then an
2732 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2733 * arp monitoring in active backup mode.
2734 */
2735 void bond_loadbalance_arp_mon(struct work_struct *work)
2736 {
2737 struct bonding *bond = container_of(work, struct bonding,
2738 arp_work.work);
2739 struct slave *slave, *oldcurrent;
2740 int do_failover = 0;
2741 int delta_in_ticks;
2742 int i;
2743
2744 read_lock(&bond->lock);
2745
2746 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2747
2748 if (bond->kill_timers)
2749 goto out;
2750
2751 if (bond->slave_cnt == 0)
2752 goto re_arm;
2753
2754 read_lock(&bond->curr_slave_lock);
2755 oldcurrent = bond->curr_active_slave;
2756 read_unlock(&bond->curr_slave_lock);
2757
2758 /* see if any of the previous devices are up now (i.e. they have
2759 * xmt and rcv traffic). the curr_active_slave does not come into
2760 * the picture unless it is null. also, slave->jiffies is not needed
2761 * here because we send an arp on each slave and give a slave as
2762 * long as it needs to get the tx/rx within the delta.
2763 * TODO: what about up/down delay in arp mode? it wasn't here before
2764 * so it can wait
2765 */
2766 bond_for_each_slave(bond, slave, i) {
2767 if (slave->link != BOND_LINK_UP) {
2768 if (time_before_eq(jiffies, dev_trans_start(slave->dev) + delta_in_ticks) &&
2769 time_before_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
2770
2771 slave->link = BOND_LINK_UP;
2772 slave->state = BOND_STATE_ACTIVE;
2773
2774 /* primary_slave has no meaning in round-robin
2775 * mode. the window of a slave being up and
2776 * curr_active_slave being null after enslaving
2777 * is closed.
2778 */
2779 if (!oldcurrent) {
2780 pr_info(DRV_NAME
2781 ": %s: link status definitely "
2782 "up for interface %s, ",
2783 bond->dev->name,
2784 slave->dev->name);
2785 do_failover = 1;
2786 } else {
2787 pr_info(DRV_NAME
2788 ": %s: interface %s is now up\n",
2789 bond->dev->name,
2790 slave->dev->name);
2791 }
2792 }
2793 } else {
2794 /* slave->link == BOND_LINK_UP */
2795
2796 /* not all switches will respond to an arp request
2797 * when the source ip is 0, so don't take the link down
2798 * if we don't know our ip yet
2799 */
2800 if (time_after_eq(jiffies, dev_trans_start(slave->dev) + 2*delta_in_ticks) ||
2801 (time_after_eq(jiffies, slave->dev->last_rx + 2*delta_in_ticks))) {
2802
2803 slave->link = BOND_LINK_DOWN;
2804 slave->state = BOND_STATE_BACKUP;
2805
2806 if (slave->link_failure_count < UINT_MAX)
2807 slave->link_failure_count++;
2808
2809 pr_info(DRV_NAME
2810 ": %s: interface %s is now down.\n",
2811 bond->dev->name,
2812 slave->dev->name);
2813
2814 if (slave == oldcurrent)
2815 do_failover = 1;
2816 }
2817 }
2818
2819 /* note: if switch is in round-robin mode, all links
2820 * must tx arp to ensure all links rx an arp - otherwise
2821 * links may oscillate or not come up at all; if switch is
2822 * in something like xor mode, there is nothing we can
2823 * do - all replies will be rx'ed on same link causing slaves
2824 * to be unstable during low/no traffic periods
2825 */
2826 if (IS_UP(slave->dev))
2827 bond_arp_send_all(bond, slave);
2828 }
2829
2830 if (do_failover) {
2831 write_lock_bh(&bond->curr_slave_lock);
2832
2833 bond_select_active_slave(bond);
2834
2835 write_unlock_bh(&bond->curr_slave_lock);
2836 }
2837
2838 re_arm:
2839 if (bond->params.arp_interval)
2840 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2841 out:
2842 read_unlock(&bond->lock);
2843 }
2844
2845 /*
2846 * Called to inspect slaves for active-backup mode ARP monitor link state
2847 * changes. Sets new_link in slaves to specify what action should take
2848 * place for the slave. Returns 0 if no changes are found, >0 if changes
2849 * to link states must be committed.
2850 *
2851 * Called with bond->lock held for read.
2852 */
2853 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2854 {
2855 struct slave *slave;
2856 int i, commit = 0;
2857
2858 bond_for_each_slave(bond, slave, i) {
2859 slave->new_link = BOND_LINK_NOCHANGE;
2860
2861 if (slave->link != BOND_LINK_UP) {
2862 if (time_before_eq(jiffies, slave_last_rx(bond, slave) +
2863 delta_in_ticks)) {
2864 slave->new_link = BOND_LINK_UP;
2865 commit++;
2866 }
2867
2868 continue;
2869 }
2870
2871 /*
2872 * Give slaves 2*delta after being enslaved or made
2873 * active. This avoids bouncing, as the last receive
2874 * times need a full ARP monitor cycle to be updated.
2875 */
2876 if (!time_after_eq(jiffies, slave->jiffies +
2877 2 * delta_in_ticks))
2878 continue;
2879
2880 /*
2881 * Backup slave is down if:
2882 * - No current_arp_slave AND
2883 * - more than 3*delta since last receive AND
2884 * - the bond has an IP address
2885 *
2886 * Note: a non-null current_arp_slave indicates
2887 * the curr_active_slave went down and we are
2888 * searching for a new one; under this condition
2889 * we only take the curr_active_slave down - this
2890 * gives each slave a chance to tx/rx traffic
2891 * before being taken out
2892 */
2893 if (slave->state == BOND_STATE_BACKUP &&
2894 !bond->current_arp_slave &&
2895 time_after(jiffies, slave_last_rx(bond, slave) +
2896 3 * delta_in_ticks)) {
2897 slave->new_link = BOND_LINK_DOWN;
2898 commit++;
2899 }
2900
2901 /*
2902 * Active slave is down if:
2903 * - more than 2*delta since transmitting OR
2904 * - (more than 2*delta since receive AND
2905 * the bond has an IP address)
2906 */
2907 if ((slave->state == BOND_STATE_ACTIVE) &&
2908 (time_after_eq(jiffies, dev_trans_start(slave->dev) +
2909 2 * delta_in_ticks) ||
2910 (time_after_eq(jiffies, slave_last_rx(bond, slave)
2911 + 2 * delta_in_ticks)))) {
2912 slave->new_link = BOND_LINK_DOWN;
2913 commit++;
2914 }
2915 }
2916
2917 read_lock(&bond->curr_slave_lock);
2918
2919 /*
2920 * Trigger a commit if the primary option setting has changed.
2921 */
2922 if (bond->primary_slave &&
2923 (bond->primary_slave != bond->curr_active_slave) &&
2924 (bond->primary_slave->link == BOND_LINK_UP))
2925 commit++;
2926
2927 read_unlock(&bond->curr_slave_lock);
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
2943 bond_for_each_slave(bond, slave, i) {
2944 switch (slave->new_link) {
2945 case BOND_LINK_NOCHANGE:
2946 continue;
2947
2948 case BOND_LINK_UP:
2949 write_lock_bh(&bond->curr_slave_lock);
2950
2951 if (!bond->curr_active_slave &&
2952 time_before_eq(jiffies, dev_trans_start(slave->dev) +
2953 delta_in_ticks)) {
2954 slave->link = BOND_LINK_UP;
2955 bond_change_active_slave(bond, slave);
2956 bond->current_arp_slave = NULL;
2957
2958 pr_info(DRV_NAME
2959 ": %s: %s is up and now the "
2960 "active interface\n",
2961 bond->dev->name, slave->dev->name);
2962
2963 } else if (bond->curr_active_slave != slave) {
2964 /* this slave has just come up but we
2965 * already have a current slave; this can
2966 * also happen if bond_enslave adds a new
2967 * slave that is up while we are searching
2968 * for a new slave
2969 */
2970 slave->link = BOND_LINK_UP;
2971 bond_set_slave_inactive_flags(slave);
2972 bond->current_arp_slave = NULL;
2973
2974 pr_info(DRV_NAME
2975 ": %s: backup interface %s is now up\n",
2976 bond->dev->name, slave->dev->name);
2977 }
2978
2979 write_unlock_bh(&bond->curr_slave_lock);
2980
2981 break;
2982
2983 case BOND_LINK_DOWN:
2984 if (slave->link_failure_count < UINT_MAX)
2985 slave->link_failure_count++;
2986
2987 slave->link = BOND_LINK_DOWN;
2988
2989 if (slave == bond->curr_active_slave) {
2990 pr_info(DRV_NAME
2991 ": %s: link status down for active "
2992 "interface %s, disabling it\n",
2993 bond->dev->name, slave->dev->name);
2994
2995 bond_set_slave_inactive_flags(slave);
2996
2997 write_lock_bh(&bond->curr_slave_lock);
2998
2999 bond_select_active_slave(bond);
3000 if (bond->curr_active_slave)
3001 bond->curr_active_slave->jiffies =
3002 jiffies;
3003
3004 write_unlock_bh(&bond->curr_slave_lock);
3005
3006 bond->current_arp_slave = NULL;
3007
3008 } else if (slave->state == BOND_STATE_BACKUP) {
3009 pr_info(DRV_NAME
3010 ": %s: backup interface %s is now down\n",
3011 bond->dev->name, slave->dev->name);
3012
3013 bond_set_slave_inactive_flags(slave);
3014 }
3015 break;
3016
3017 default:
3018 pr_err(DRV_NAME
3019 ": %s: impossible: new_link %d on slave %s\n",
3020 bond->dev->name, slave->new_link,
3021 slave->dev->name);
3022 }
3023 }
3024
3025 /*
3026 * No race with changes to primary via sysfs, as we hold rtnl.
3027 */
3028 if (bond->primary_slave &&
3029 (bond->primary_slave != bond->curr_active_slave) &&
3030 (bond->primary_slave->link == BOND_LINK_UP)) {
3031 write_lock_bh(&bond->curr_slave_lock);
3032 bond_change_active_slave(bond, bond->primary_slave);
3033 write_unlock_bh(&bond->curr_slave_lock);
3034 }
3035
3036 bond_set_carrier(bond);
3037 }
3038
3039 /*
3040 * Send ARP probes for active-backup mode ARP monitor.
3041 *
3042 * Called with bond->lock held for read.
3043 */
3044 static void bond_ab_arp_probe(struct bonding *bond)
3045 {
3046 struct slave *slave;
3047 int i;
3048
3049 read_lock(&bond->curr_slave_lock);
3050
3051 if (bond->current_arp_slave && bond->curr_active_slave)
3052 pr_info(DRV_NAME "PROBE: c_arp %s && cas %s BAD\n",
3053 bond->current_arp_slave->dev->name,
3054 bond->curr_active_slave->dev->name);
3055
3056 if (bond->curr_active_slave) {
3057 bond_arp_send_all(bond, bond->curr_active_slave);
3058 read_unlock(&bond->curr_slave_lock);
3059 return;
3060 }
3061
3062 read_unlock(&bond->curr_slave_lock);
3063
3064 /* if we don't have a curr_active_slave, search for the next available
3065 * backup slave from the current_arp_slave and make it the candidate
3066 * for becoming the curr_active_slave
3067 */
3068
3069 if (!bond->current_arp_slave) {
3070 bond->current_arp_slave = bond->first_slave;
3071 if (!bond->current_arp_slave)
3072 return;
3073 }
3074
3075 bond_set_slave_inactive_flags(bond->current_arp_slave);
3076
3077 /* search for next candidate */
3078 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3079 if (IS_UP(slave->dev)) {
3080 slave->link = BOND_LINK_BACK;
3081 bond_set_slave_active_flags(slave);
3082 bond_arp_send_all(bond, slave);
3083 slave->jiffies = jiffies;
3084 bond->current_arp_slave = slave;
3085 break;
3086 }
3087
3088 /* if the link state is up at this point, we
3089 * mark it down - this can happen if we have
3090 * simultaneous link failures and
3091 * reselect_active_interface doesn't make this
3092 * one the current slave so it is still marked
3093 * up when it is actually down
3094 */
3095 if (slave->link == BOND_LINK_UP) {
3096 slave->link = BOND_LINK_DOWN;
3097 if (slave->link_failure_count < UINT_MAX)
3098 slave->link_failure_count++;
3099
3100 bond_set_slave_inactive_flags(slave);
3101
3102 pr_info(DRV_NAME
3103 ": %s: backup interface %s is now down.\n",
3104 bond->dev->name, slave->dev->name);
3105 }
3106 }
3107 }
3108
3109 void bond_activebackup_arp_mon(struct work_struct *work)
3110 {
3111 struct bonding *bond = container_of(work, struct bonding,
3112 arp_work.work);
3113 int delta_in_ticks;
3114
3115 read_lock(&bond->lock);
3116
3117 if (bond->kill_timers)
3118 goto out;
3119
3120 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3121
3122 if (bond->slave_cnt == 0)
3123 goto re_arm;
3124
3125 if (bond->send_grat_arp) {
3126 read_lock(&bond->curr_slave_lock);
3127 bond_send_gratuitous_arp(bond);
3128 read_unlock(&bond->curr_slave_lock);
3129 }
3130
3131 if (bond->send_unsol_na) {
3132 read_lock(&bond->curr_slave_lock);
3133 bond_send_unsolicited_na(bond);
3134 read_unlock(&bond->curr_slave_lock);
3135 }
3136
3137 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3138 read_unlock(&bond->lock);
3139 rtnl_lock();
3140 read_lock(&bond->lock);
3141
3142 bond_ab_arp_commit(bond, delta_in_ticks);
3143
3144 read_unlock(&bond->lock);
3145 rtnl_unlock();
3146 read_lock(&bond->lock);
3147 }
3148
3149 bond_ab_arp_probe(bond);
3150
3151 re_arm:
3152 if (bond->params.arp_interval)
3153 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3154 out:
3155 read_unlock(&bond->lock);
3156 }
3157
3158 /*------------------------------ proc/seq_file-------------------------------*/
3159
3160 #ifdef CONFIG_PROC_FS
3161
3162 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3163 __acquires(&dev_base_lock)
3164 __acquires(&bond->lock)
3165 {
3166 struct bonding *bond = seq->private;
3167 loff_t off = 0;
3168 struct slave *slave;
3169 int i;
3170
3171 /* make sure the bond won't be taken away */
3172 read_lock(&dev_base_lock);
3173 read_lock(&bond->lock);
3174
3175 if (*pos == 0)
3176 return SEQ_START_TOKEN;
3177
3178 bond_for_each_slave(bond, slave, i) {
3179 if (++off == *pos)
3180 return slave;
3181 }
3182
3183 return NULL;
3184 }
3185
3186 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3187 {
3188 struct bonding *bond = seq->private;
3189 struct slave *slave = v;
3190
3191 ++*pos;
3192 if (v == SEQ_START_TOKEN)
3193 return bond->first_slave;
3194
3195 slave = slave->next;
3196
3197 return (slave == bond->first_slave) ? NULL : slave;
3198 }
3199
3200 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3201 __releases(&bond->lock)
3202 __releases(&dev_base_lock)
3203 {
3204 struct bonding *bond = seq->private;
3205
3206 read_unlock(&bond->lock);
3207 read_unlock(&dev_base_lock);
3208 }
3209
3210 static void bond_info_show_master(struct seq_file *seq)
3211 {
3212 struct bonding *bond = seq->private;
3213 struct slave *curr;
3214 int i;
3215
3216 read_lock(&bond->curr_slave_lock);
3217 curr = bond->curr_active_slave;
3218 read_unlock(&bond->curr_slave_lock);
3219
3220 seq_printf(seq, "Bonding Mode: %s",
3221 bond_mode_name(bond->params.mode));
3222
3223 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3224 bond->params.fail_over_mac)
3225 seq_printf(seq, " (fail_over_mac %s)",
3226 fail_over_mac_tbl[bond->params.fail_over_mac].modename);
3227
3228 seq_printf(seq, "\n");
3229
3230 if (bond->params.mode == BOND_MODE_XOR ||
3231 bond->params.mode == BOND_MODE_8023AD) {
3232 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3233 xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3234 bond->params.xmit_policy);
3235 }
3236
3237 if (USES_PRIMARY(bond->params.mode)) {
3238 seq_printf(seq, "Primary Slave: %s\n",
3239 (bond->primary_slave) ?
3240 bond->primary_slave->dev->name : "None");
3241
3242 seq_printf(seq, "Currently Active Slave: %s\n",
3243 (curr) ? curr->dev->name : "None");
3244 }
3245
3246 seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3247 "up" : "down");
3248 seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3249 seq_printf(seq, "Up Delay (ms): %d\n",
3250 bond->params.updelay * bond->params.miimon);
3251 seq_printf(seq, "Down Delay (ms): %d\n",
3252 bond->params.downdelay * bond->params.miimon);
3253
3254
3255 /* ARP information */
3256 if (bond->params.arp_interval > 0) {
3257 int printed = 0;
3258 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3259 bond->params.arp_interval);
3260
3261 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3262
3263 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
3264 if (!bond->params.arp_targets[i])
3265 break;
3266 if (printed)
3267 seq_printf(seq, ",");
3268 seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
3269 printed = 1;
3270 }
3271 seq_printf(seq, "\n");
3272 }
3273
3274 if (bond->params.mode == BOND_MODE_8023AD) {
3275 struct ad_info ad_info;
3276
3277 seq_puts(seq, "\n802.3ad info\n");
3278 seq_printf(seq, "LACP rate: %s\n",
3279 (bond->params.lacp_fast) ? "fast" : "slow");
3280 seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
3281 ad_select_tbl[bond->params.ad_select].modename);
3282
3283 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3284 seq_printf(seq, "bond %s has no active aggregator\n",
3285 bond->dev->name);
3286 } else {
3287 seq_printf(seq, "Active Aggregator Info:\n");
3288
3289 seq_printf(seq, "\tAggregator ID: %d\n",
3290 ad_info.aggregator_id);
3291 seq_printf(seq, "\tNumber of ports: %d\n",
3292 ad_info.ports);
3293 seq_printf(seq, "\tActor Key: %d\n",
3294 ad_info.actor_key);
3295 seq_printf(seq, "\tPartner Key: %d\n",
3296 ad_info.partner_key);
3297 seq_printf(seq, "\tPartner Mac Address: %pM\n",
3298 ad_info.partner_system);
3299 }
3300 }
3301 }
3302
3303 static void bond_info_show_slave(struct seq_file *seq,
3304 const struct slave *slave)
3305 {
3306 struct bonding *bond = seq->private;
3307
3308 seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3309 seq_printf(seq, "MII Status: %s\n",
3310 (slave->link == BOND_LINK_UP) ? "up" : "down");
3311 seq_printf(seq, "Link Failure Count: %u\n",
3312 slave->link_failure_count);
3313
3314 seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
3315
3316 if (bond->params.mode == BOND_MODE_8023AD) {
3317 const struct aggregator *agg
3318 = SLAVE_AD_INFO(slave).port.aggregator;
3319
3320 if (agg)
3321 seq_printf(seq, "Aggregator ID: %d\n",
3322 agg->aggregator_identifier);
3323 else
3324 seq_puts(seq, "Aggregator ID: N/A\n");
3325 }
3326 }
3327
3328 static int bond_info_seq_show(struct seq_file *seq, void *v)
3329 {
3330 if (v == SEQ_START_TOKEN) {
3331 seq_printf(seq, "%s\n", version);
3332 bond_info_show_master(seq);
3333 } else
3334 bond_info_show_slave(seq, v);
3335
3336 return 0;
3337 }
3338
3339 static const struct seq_operations bond_info_seq_ops = {
3340 .start = bond_info_seq_start,
3341 .next = bond_info_seq_next,
3342 .stop = bond_info_seq_stop,
3343 .show = bond_info_seq_show,
3344 };
3345
3346 static int bond_info_open(struct inode *inode, struct file *file)
3347 {
3348 struct seq_file *seq;
3349 struct proc_dir_entry *proc;
3350 int res;
3351
3352 res = seq_open(file, &bond_info_seq_ops);
3353 if (!res) {
3354 /* recover the pointer buried in proc_dir_entry data */
3355 seq = file->private_data;
3356 proc = PDE(inode);
3357 seq->private = proc->data;
3358 }
3359
3360 return res;
3361 }
3362
3363 static const struct file_operations bond_info_fops = {
3364 .owner = THIS_MODULE,
3365 .open = bond_info_open,
3366 .read = seq_read,
3367 .llseek = seq_lseek,
3368 .release = seq_release,
3369 };
3370
3371 static int bond_create_proc_entry(struct bonding *bond)
3372 {
3373 struct net_device *bond_dev = bond->dev;
3374
3375 if (bond_proc_dir) {
3376 bond->proc_entry = proc_create_data(bond_dev->name,
3377 S_IRUGO, bond_proc_dir,
3378 &bond_info_fops, bond);
3379 if (bond->proc_entry == NULL)
3380 pr_warning(DRV_NAME
3381 ": Warning: Cannot create /proc/net/%s/%s\n",
3382 DRV_NAME, bond_dev->name);
3383 else
3384 memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3385 }
3386
3387 return 0;
3388 }
3389
3390 static void bond_remove_proc_entry(struct bonding *bond)
3391 {
3392 if (bond_proc_dir && bond->proc_entry) {
3393 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3394 memset(bond->proc_file_name, 0, IFNAMSIZ);
3395 bond->proc_entry = NULL;
3396 }
3397 }
3398
3399 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3400 * Caller must hold rtnl_lock.
3401 */
3402 static void bond_create_proc_dir(void)
3403 {
3404 if (!bond_proc_dir) {
3405 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3406 if (!bond_proc_dir)
3407 pr_warning(DRV_NAME
3408 ": Warning: cannot create /proc/net/%s\n",
3409 DRV_NAME);
3410 }
3411 }
3412
3413 /* Destroy the bonding directory under /proc/net, if empty.
3414 * Caller must hold rtnl_lock.
3415 */
3416 static void bond_destroy_proc_dir(void)
3417 {
3418 if (bond_proc_dir) {
3419 remove_proc_entry(DRV_NAME, init_net.proc_net);
3420 bond_proc_dir = NULL;
3421 }
3422 }
3423
3424 #else /* !CONFIG_PROC_FS */
3425
3426 static int bond_create_proc_entry(struct bonding *bond)
3427 {
3428 }
3429
3430 static void bond_remove_proc_entry(struct bonding *bond)
3431 {
3432 }
3433
3434 static void bond_create_proc_dir(void)
3435 {
3436 }
3437
3438 static void bond_destroy_proc_dir(void)
3439 {
3440 }
3441
3442 #endif /* CONFIG_PROC_FS */
3443
3444
3445 /*-------------------------- netdev event handling --------------------------*/
3446
3447 /*
3448 * Change device name
3449 */
3450 static int bond_event_changename(struct bonding *bond)
3451 {
3452 bond_remove_proc_entry(bond);
3453 bond_create_proc_entry(bond);
3454
3455 bond_destroy_sysfs_entry(bond);
3456 bond_create_sysfs_entry(bond);
3457
3458 return NOTIFY_DONE;
3459 }
3460
3461 static int bond_master_netdev_event(unsigned long event,
3462 struct net_device *bond_dev)
3463 {
3464 struct bonding *event_bond = netdev_priv(bond_dev);
3465
3466 switch (event) {
3467 case NETDEV_CHANGENAME:
3468 return bond_event_changename(event_bond);
3469 case NETDEV_UNREGISTER:
3470 bond_release_all(event_bond->dev);
3471 break;
3472 default:
3473 break;
3474 }
3475
3476 return NOTIFY_DONE;
3477 }
3478
3479 static int bond_slave_netdev_event(unsigned long event,
3480 struct net_device *slave_dev)
3481 {
3482 struct net_device *bond_dev = slave_dev->master;
3483 struct bonding *bond = netdev_priv(bond_dev);
3484
3485 switch (event) {
3486 case NETDEV_UNREGISTER:
3487 if (bond_dev) {
3488 if (bond->setup_by_slave)
3489 bond_release_and_destroy(bond_dev, slave_dev);
3490 else
3491 bond_release(bond_dev, slave_dev);
3492 }
3493 break;
3494 case NETDEV_CHANGE:
3495 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3496 struct slave *slave;
3497
3498 slave = bond_get_slave_by_dev(bond, slave_dev);
3499 if (slave) {
3500 u16 old_speed = slave->speed;
3501 u16 old_duplex = slave->duplex;
3502
3503 bond_update_speed_duplex(slave);
3504
3505 if (bond_is_lb(bond))
3506 break;
3507
3508 if (old_speed != slave->speed)
3509 bond_3ad_adapter_speed_changed(slave);
3510 if (old_duplex != slave->duplex)
3511 bond_3ad_adapter_duplex_changed(slave);
3512 }
3513 }
3514
3515 break;
3516 case NETDEV_DOWN:
3517 /*
3518 * ... Or is it this?
3519 */
3520 break;
3521 case NETDEV_CHANGEMTU:
3522 /*
3523 * TODO: Should slaves be allowed to
3524 * independently alter their MTU? For
3525 * an active-backup bond, slaves need
3526 * not be the same type of device, so
3527 * MTUs may vary. For other modes,
3528 * slaves arguably should have the
3529 * same MTUs. To do this, we'd need to
3530 * take over the slave's change_mtu
3531 * function for the duration of their
3532 * servitude.
3533 */
3534 break;
3535 case NETDEV_CHANGENAME:
3536 /*
3537 * TODO: handle changing the primary's name
3538 */
3539 break;
3540 case NETDEV_FEAT_CHANGE:
3541 bond_compute_features(bond);
3542 break;
3543 default:
3544 break;
3545 }
3546
3547 return NOTIFY_DONE;
3548 }
3549
3550 /*
3551 * bond_netdev_event: handle netdev notifier chain events.
3552 *
3553 * This function receives events for the netdev chain. The caller (an
3554 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3555 * locks for us to safely manipulate the slave devices (RTNL lock,
3556 * dev_probe_lock).
3557 */
3558 static int bond_netdev_event(struct notifier_block *this,
3559 unsigned long event, void *ptr)
3560 {
3561 struct net_device *event_dev = (struct net_device *)ptr;
3562
3563 if (dev_net(event_dev) != &init_net)
3564 return NOTIFY_DONE;
3565
3566 pr_debug("event_dev: %s, event: %lx\n",
3567 (event_dev ? event_dev->name : "None"),
3568 event);
3569
3570 if (!(event_dev->priv_flags & IFF_BONDING))
3571 return NOTIFY_DONE;
3572
3573 if (event_dev->flags & IFF_MASTER) {
3574 pr_debug("IFF_MASTER\n");
3575 return bond_master_netdev_event(event, event_dev);
3576 }
3577
3578 if (event_dev->flags & IFF_SLAVE) {
3579 pr_debug("IFF_SLAVE\n");
3580 return bond_slave_netdev_event(event, event_dev);
3581 }
3582
3583 return NOTIFY_DONE;
3584 }
3585
3586 /*
3587 * bond_inetaddr_event: handle inetaddr notifier chain events.
3588 *
3589 * We keep track of device IPs primarily to use as source addresses in
3590 * ARP monitor probes (rather than spewing out broadcasts all the time).
3591 *
3592 * We track one IP for the main device (if it has one), plus one per VLAN.
3593 */
3594 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3595 {
3596 struct in_ifaddr *ifa = ptr;
3597 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3598 struct bonding *bond;
3599 struct vlan_entry *vlan;
3600
3601 if (dev_net(ifa->ifa_dev->dev) != &init_net)
3602 return NOTIFY_DONE;
3603
3604 list_for_each_entry(bond, &bond_dev_list, bond_list) {
3605 if (bond->dev == event_dev) {
3606 switch (event) {
3607 case NETDEV_UP:
3608 bond->master_ip = ifa->ifa_local;
3609 return NOTIFY_OK;
3610 case NETDEV_DOWN:
3611 bond->master_ip = bond_glean_dev_ip(bond->dev);
3612 return NOTIFY_OK;
3613 default:
3614 return NOTIFY_DONE;
3615 }
3616 }
3617
3618 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3619 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3620 if (vlan_dev == event_dev) {
3621 switch (event) {
3622 case NETDEV_UP:
3623 vlan->vlan_ip = ifa->ifa_local;
3624 return NOTIFY_OK;
3625 case NETDEV_DOWN:
3626 vlan->vlan_ip =
3627 bond_glean_dev_ip(vlan_dev);
3628 return NOTIFY_OK;
3629 default:
3630 return NOTIFY_DONE;
3631 }
3632 }
3633 }
3634 }
3635 return NOTIFY_DONE;
3636 }
3637
3638 static struct notifier_block bond_netdev_notifier = {
3639 .notifier_call = bond_netdev_event,
3640 };
3641
3642 static struct notifier_block bond_inetaddr_notifier = {
3643 .notifier_call = bond_inetaddr_event,
3644 };
3645
3646 /*-------------------------- Packet type handling ---------------------------*/
3647
3648 /* register to receive lacpdus on a bond */
3649 static void bond_register_lacpdu(struct bonding *bond)
3650 {
3651 struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3652
3653 /* initialize packet type */
3654 pk_type->type = PKT_TYPE_LACPDU;
3655 pk_type->dev = bond->dev;
3656 pk_type->func = bond_3ad_lacpdu_recv;
3657
3658 dev_add_pack(pk_type);
3659 }
3660
3661 /* unregister to receive lacpdus on a bond */
3662 static void bond_unregister_lacpdu(struct bonding *bond)
3663 {
3664 dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3665 }
3666
3667 void bond_register_arp(struct bonding *bond)
3668 {
3669 struct packet_type *pt = &bond->arp_mon_pt;
3670
3671 if (pt->type)
3672 return;
3673
3674 pt->type = htons(ETH_P_ARP);
3675 pt->dev = bond->dev;
3676 pt->func = bond_arp_rcv;
3677 dev_add_pack(pt);
3678 }
3679
3680 void bond_unregister_arp(struct bonding *bond)
3681 {
3682 struct packet_type *pt = &bond->arp_mon_pt;
3683
3684 dev_remove_pack(pt);
3685 pt->type = 0;
3686 }
3687
3688 /*---------------------------- Hashing Policies -----------------------------*/
3689
3690 /*
3691 * Hash for the output device based upon layer 2 and layer 3 data. If
3692 * the packet is not IP mimic bond_xmit_hash_policy_l2()
3693 */
3694 static int bond_xmit_hash_policy_l23(struct sk_buff *skb,
3695 struct net_device *bond_dev, int count)
3696 {
3697 struct ethhdr *data = (struct ethhdr *)skb->data;
3698 struct iphdr *iph = ip_hdr(skb);
3699
3700 if (skb->protocol == htons(ETH_P_IP)) {
3701 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3702 (data->h_dest[5] ^ bond_dev->dev_addr[5])) % count;
3703 }
3704
3705 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3706 }
3707
3708 /*
3709 * Hash for the output device based upon layer 3 and layer 4 data. If
3710 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3711 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3712 */
3713 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3714 struct net_device *bond_dev, int count)
3715 {
3716 struct ethhdr *data = (struct ethhdr *)skb->data;
3717 struct iphdr *iph = ip_hdr(skb);
3718 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3719 int layer4_xor = 0;
3720
3721 if (skb->protocol == htons(ETH_P_IP)) {
3722 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3723 (iph->protocol == IPPROTO_TCP ||
3724 iph->protocol == IPPROTO_UDP)) {
3725 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3726 }
3727 return (layer4_xor ^
3728 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3729
3730 }
3731
3732 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3733 }
3734
3735 /*
3736 * Hash for the output device based upon layer 2 data
3737 */
3738 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3739 struct net_device *bond_dev, int count)
3740 {
3741 struct ethhdr *data = (struct ethhdr *)skb->data;
3742
3743 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3744 }
3745
3746 /*-------------------------- Device entry points ----------------------------*/
3747
3748 static int bond_open(struct net_device *bond_dev)
3749 {
3750 struct bonding *bond = netdev_priv(bond_dev);
3751
3752 bond->kill_timers = 0;
3753
3754 if (bond_is_lb(bond)) {
3755 /* bond_alb_initialize must be called before the timer
3756 * is started.
3757 */
3758 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3759 /* something went wrong - fail the open operation */
3760 return -1;
3761 }
3762
3763 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3764 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3765 }
3766
3767 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3768 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3769 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3770 }
3771
3772 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3773 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3774 INIT_DELAYED_WORK(&bond->arp_work,
3775 bond_activebackup_arp_mon);
3776 else
3777 INIT_DELAYED_WORK(&bond->arp_work,
3778 bond_loadbalance_arp_mon);
3779
3780 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3781 if (bond->params.arp_validate)
3782 bond_register_arp(bond);
3783 }
3784
3785 if (bond->params.mode == BOND_MODE_8023AD) {
3786 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3787 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3788 /* register to receive LACPDUs */
3789 bond_register_lacpdu(bond);
3790 bond_3ad_initiate_agg_selection(bond, 1);
3791 }
3792
3793 return 0;
3794 }
3795
3796 static int bond_close(struct net_device *bond_dev)
3797 {
3798 struct bonding *bond = netdev_priv(bond_dev);
3799
3800 if (bond->params.mode == BOND_MODE_8023AD) {
3801 /* Unregister the receive of LACPDUs */
3802 bond_unregister_lacpdu(bond);
3803 }
3804
3805 if (bond->params.arp_validate)
3806 bond_unregister_arp(bond);
3807
3808 write_lock_bh(&bond->lock);
3809
3810 bond->send_grat_arp = 0;
3811 bond->send_unsol_na = 0;
3812
3813 /* signal timers not to re-arm */
3814 bond->kill_timers = 1;
3815
3816 write_unlock_bh(&bond->lock);
3817
3818 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3819 cancel_delayed_work(&bond->mii_work);
3820 }
3821
3822 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3823 cancel_delayed_work(&bond->arp_work);
3824 }
3825
3826 switch (bond->params.mode) {
3827 case BOND_MODE_8023AD:
3828 cancel_delayed_work(&bond->ad_work);
3829 break;
3830 case BOND_MODE_TLB:
3831 case BOND_MODE_ALB:
3832 cancel_delayed_work(&bond->alb_work);
3833 break;
3834 default:
3835 break;
3836 }
3837
3838
3839 if (bond_is_lb(bond)) {
3840 /* Must be called only after all
3841 * slaves have been released
3842 */
3843 bond_alb_deinitialize(bond);
3844 }
3845
3846 return 0;
3847 }
3848
3849 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3850 {
3851 struct bonding *bond = netdev_priv(bond_dev);
3852 struct net_device_stats *stats = &bond->stats;
3853 struct net_device_stats local_stats;
3854 struct slave *slave;
3855 int i;
3856
3857 memset(&local_stats, 0, sizeof(struct net_device_stats));
3858
3859 read_lock_bh(&bond->lock);
3860
3861 bond_for_each_slave(bond, slave, i) {
3862 const struct net_device_stats *sstats = dev_get_stats(slave->dev);
3863
3864 local_stats.rx_packets += sstats->rx_packets;
3865 local_stats.rx_bytes += sstats->rx_bytes;
3866 local_stats.rx_errors += sstats->rx_errors;
3867 local_stats.rx_dropped += sstats->rx_dropped;
3868
3869 local_stats.tx_packets += sstats->tx_packets;
3870 local_stats.tx_bytes += sstats->tx_bytes;
3871 local_stats.tx_errors += sstats->tx_errors;
3872 local_stats.tx_dropped += sstats->tx_dropped;
3873
3874 local_stats.multicast += sstats->multicast;
3875 local_stats.collisions += sstats->collisions;
3876
3877 local_stats.rx_length_errors += sstats->rx_length_errors;
3878 local_stats.rx_over_errors += sstats->rx_over_errors;
3879 local_stats.rx_crc_errors += sstats->rx_crc_errors;
3880 local_stats.rx_frame_errors += sstats->rx_frame_errors;
3881 local_stats.rx_fifo_errors += sstats->rx_fifo_errors;
3882 local_stats.rx_missed_errors += sstats->rx_missed_errors;
3883
3884 local_stats.tx_aborted_errors += sstats->tx_aborted_errors;
3885 local_stats.tx_carrier_errors += sstats->tx_carrier_errors;
3886 local_stats.tx_fifo_errors += sstats->tx_fifo_errors;
3887 local_stats.tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3888 local_stats.tx_window_errors += sstats->tx_window_errors;
3889 }
3890
3891 memcpy(stats, &local_stats, sizeof(struct net_device_stats));
3892
3893 read_unlock_bh(&bond->lock);
3894
3895 return stats;
3896 }
3897
3898 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3899 {
3900 struct net_device *slave_dev = NULL;
3901 struct ifbond k_binfo;
3902 struct ifbond __user *u_binfo = NULL;
3903 struct ifslave k_sinfo;
3904 struct ifslave __user *u_sinfo = NULL;
3905 struct mii_ioctl_data *mii = NULL;
3906 int res = 0;
3907
3908 pr_debug("bond_ioctl: master=%s, cmd=%d\n",
3909 bond_dev->name, cmd);
3910
3911 switch (cmd) {
3912 case SIOCGMIIPHY:
3913 mii = if_mii(ifr);
3914 if (!mii)
3915 return -EINVAL;
3916
3917 mii->phy_id = 0;
3918 /* Fall Through */
3919 case SIOCGMIIREG:
3920 /*
3921 * We do this again just in case we were called by SIOCGMIIREG
3922 * instead of SIOCGMIIPHY.
3923 */
3924 mii = if_mii(ifr);
3925 if (!mii)
3926 return -EINVAL;
3927
3928
3929 if (mii->reg_num == 1) {
3930 struct bonding *bond = netdev_priv(bond_dev);
3931 mii->val_out = 0;
3932 read_lock(&bond->lock);
3933 read_lock(&bond->curr_slave_lock);
3934 if (netif_carrier_ok(bond->dev))
3935 mii->val_out = BMSR_LSTATUS;
3936
3937 read_unlock(&bond->curr_slave_lock);
3938 read_unlock(&bond->lock);
3939 }
3940
3941 return 0;
3942 case BOND_INFO_QUERY_OLD:
3943 case SIOCBONDINFOQUERY:
3944 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3945
3946 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3947 return -EFAULT;
3948
3949 res = bond_info_query(bond_dev, &k_binfo);
3950 if (res == 0 &&
3951 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3952 return -EFAULT;
3953
3954 return res;
3955 case BOND_SLAVE_INFO_QUERY_OLD:
3956 case SIOCBONDSLAVEINFOQUERY:
3957 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3958
3959 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3960 return -EFAULT;
3961
3962 res = bond_slave_info_query(bond_dev, &k_sinfo);
3963 if (res == 0 &&
3964 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3965 return -EFAULT;
3966
3967 return res;
3968 default:
3969 /* Go on */
3970 break;
3971 }
3972
3973 if (!capable(CAP_NET_ADMIN))
3974 return -EPERM;
3975
3976 slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
3977
3978 pr_debug("slave_dev=%p: \n", slave_dev);
3979
3980 if (!slave_dev)
3981 res = -ENODEV;
3982 else {
3983 pr_debug("slave_dev->name=%s: \n", slave_dev->name);
3984 switch (cmd) {
3985 case BOND_ENSLAVE_OLD:
3986 case SIOCBONDENSLAVE:
3987 res = bond_enslave(bond_dev, slave_dev);
3988 break;
3989 case BOND_RELEASE_OLD:
3990 case SIOCBONDRELEASE:
3991 res = bond_release(bond_dev, slave_dev);
3992 break;
3993 case BOND_SETHWADDR_OLD:
3994 case SIOCBONDSETHWADDR:
3995 res = bond_sethwaddr(bond_dev, slave_dev);
3996 break;
3997 case BOND_CHANGE_ACTIVE_OLD:
3998 case SIOCBONDCHANGEACTIVE:
3999 res = bond_ioctl_change_active(bond_dev, slave_dev);
4000 break;
4001 default:
4002 res = -EOPNOTSUPP;
4003 }
4004
4005 dev_put(slave_dev);
4006 }
4007
4008 return res;
4009 }
4010
4011 static void bond_set_multicast_list(struct net_device *bond_dev)
4012 {
4013 struct bonding *bond = netdev_priv(bond_dev);
4014 struct dev_mc_list *dmi;
4015
4016 /*
4017 * Do promisc before checking multicast_mode
4018 */
4019 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC))
4020 /*
4021 * FIXME: Need to handle the error when one of the multi-slaves
4022 * encounters error.
4023 */
4024 bond_set_promiscuity(bond, 1);
4025
4026
4027 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC))
4028 bond_set_promiscuity(bond, -1);
4029
4030
4031 /* set allmulti flag to slaves */
4032 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI))
4033 /*
4034 * FIXME: Need to handle the error when one of the multi-slaves
4035 * encounters error.
4036 */
4037 bond_set_allmulti(bond, 1);
4038
4039
4040 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI))
4041 bond_set_allmulti(bond, -1);
4042
4043
4044 read_lock(&bond->lock);
4045
4046 bond->flags = bond_dev->flags;
4047
4048 /* looking for addresses to add to slaves' mc list */
4049 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
4050 if (!bond_mc_list_find_dmi(dmi, bond->mc_list))
4051 bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4052 }
4053
4054 /* looking for addresses to delete from slaves' list */
4055 for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
4056 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list))
4057 bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4058 }
4059
4060 /* save master's multicast list */
4061 bond_mc_list_destroy(bond);
4062 bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
4063
4064 read_unlock(&bond->lock);
4065 }
4066
4067 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
4068 {
4069 struct bonding *bond = netdev_priv(dev);
4070 struct slave *slave = bond->first_slave;
4071
4072 if (slave) {
4073 const struct net_device_ops *slave_ops
4074 = slave->dev->netdev_ops;
4075 if (slave_ops->ndo_neigh_setup)
4076 return slave_ops->ndo_neigh_setup(slave->dev, parms);
4077 }
4078 return 0;
4079 }
4080
4081 /*
4082 * Change the MTU of all of a master's slaves to match the master
4083 */
4084 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4085 {
4086 struct bonding *bond = netdev_priv(bond_dev);
4087 struct slave *slave, *stop_at;
4088 int res = 0;
4089 int i;
4090
4091 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
4092 (bond_dev ? bond_dev->name : "None"), new_mtu);
4093
4094 /* Can't hold bond->lock with bh disabled here since
4095 * some base drivers panic. On the other hand we can't
4096 * hold bond->lock without bh disabled because we'll
4097 * deadlock. The only solution is to rely on the fact
4098 * that we're under rtnl_lock here, and the slaves
4099 * list won't change. This doesn't solve the problem
4100 * of setting the slave's MTU while it is
4101 * transmitting, but the assumption is that the base
4102 * driver can handle that.
4103 *
4104 * TODO: figure out a way to safely iterate the slaves
4105 * list, but without holding a lock around the actual
4106 * call to the base driver.
4107 */
4108
4109 bond_for_each_slave(bond, slave, i) {
4110 pr_debug("s %p s->p %p c_m %p\n", slave,
4111 slave->prev, slave->dev->netdev_ops->ndo_change_mtu);
4112
4113 res = dev_set_mtu(slave->dev, new_mtu);
4114
4115 if (res) {
4116 /* If we failed to set the slave's mtu to the new value
4117 * we must abort the operation even in ACTIVE_BACKUP
4118 * mode, because if we allow the backup slaves to have
4119 * different mtu values than the active slave we'll
4120 * need to change their mtu when doing a failover. That
4121 * means changing their mtu from timer context, which
4122 * is probably not a good idea.
4123 */
4124 pr_debug("err %d %s\n", res, slave->dev->name);
4125 goto unwind;
4126 }
4127 }
4128
4129 bond_dev->mtu = new_mtu;
4130
4131 return 0;
4132
4133 unwind:
4134 /* unwind from head to the slave that failed */
4135 stop_at = slave;
4136 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4137 int tmp_res;
4138
4139 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4140 if (tmp_res) {
4141 pr_debug("unwind err %d dev %s\n", tmp_res,
4142 slave->dev->name);
4143 }
4144 }
4145
4146 return res;
4147 }
4148
4149 /*
4150 * Change HW address
4151 *
4152 * Note that many devices must be down to change the HW address, and
4153 * downing the master releases all slaves. We can make bonds full of
4154 * bonding devices to test this, however.
4155 */
4156 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4157 {
4158 struct bonding *bond = netdev_priv(bond_dev);
4159 struct sockaddr *sa = addr, tmp_sa;
4160 struct slave *slave, *stop_at;
4161 int res = 0;
4162 int i;
4163
4164 if (bond->params.mode == BOND_MODE_ALB)
4165 return bond_alb_set_mac_address(bond_dev, addr);
4166
4167
4168 pr_debug("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
4169
4170 /*
4171 * If fail_over_mac is set to active, do nothing and return
4172 * success. Returning an error causes ifenslave to fail.
4173 */
4174 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
4175 return 0;
4176
4177 if (!is_valid_ether_addr(sa->sa_data))
4178 return -EADDRNOTAVAIL;
4179
4180 /* Can't hold bond->lock with bh disabled here since
4181 * some base drivers panic. On the other hand we can't
4182 * hold bond->lock without bh disabled because we'll
4183 * deadlock. The only solution is to rely on the fact
4184 * that we're under rtnl_lock here, and the slaves
4185 * list won't change. This doesn't solve the problem
4186 * of setting the slave's hw address while it is
4187 * transmitting, but the assumption is that the base
4188 * driver can handle that.
4189 *
4190 * TODO: figure out a way to safely iterate the slaves
4191 * list, but without holding a lock around the actual
4192 * call to the base driver.
4193 */
4194
4195 bond_for_each_slave(bond, slave, i) {
4196 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
4197 pr_debug("slave %p %s\n", slave, slave->dev->name);
4198
4199 if (slave_ops->ndo_set_mac_address == NULL) {
4200 res = -EOPNOTSUPP;
4201 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
4202 goto unwind;
4203 }
4204
4205 res = dev_set_mac_address(slave->dev, addr);
4206 if (res) {
4207 /* TODO: consider downing the slave
4208 * and retry ?
4209 * User should expect communications
4210 * breakage anyway until ARP finish
4211 * updating, so...
4212 */
4213 pr_debug("err %d %s\n", res, slave->dev->name);
4214 goto unwind;
4215 }
4216 }
4217
4218 /* success */
4219 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4220 return 0;
4221
4222 unwind:
4223 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4224 tmp_sa.sa_family = bond_dev->type;
4225
4226 /* unwind from head to the slave that failed */
4227 stop_at = slave;
4228 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4229 int tmp_res;
4230
4231 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4232 if (tmp_res) {
4233 pr_debug("unwind err %d dev %s\n", tmp_res,
4234 slave->dev->name);
4235 }
4236 }
4237
4238 return res;
4239 }
4240
4241 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4242 {
4243 struct bonding *bond = netdev_priv(bond_dev);
4244 struct slave *slave, *start_at;
4245 int i, slave_no, res = 1;
4246
4247 read_lock(&bond->lock);
4248
4249 if (!BOND_IS_OK(bond))
4250 goto out;
4251
4252 /*
4253 * Concurrent TX may collide on rr_tx_counter; we accept that
4254 * as being rare enough not to justify using an atomic op here
4255 */
4256 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4257
4258 bond_for_each_slave(bond, slave, i) {
4259 slave_no--;
4260 if (slave_no < 0)
4261 break;
4262 }
4263
4264 start_at = slave;
4265 bond_for_each_slave_from(bond, slave, i, start_at) {
4266 if (IS_UP(slave->dev) &&
4267 (slave->link == BOND_LINK_UP) &&
4268 (slave->state == BOND_STATE_ACTIVE)) {
4269 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4270 break;
4271 }
4272 }
4273
4274 out:
4275 if (res) {
4276 /* no suitable interface, frame not sent */
4277 dev_kfree_skb(skb);
4278 }
4279 read_unlock(&bond->lock);
4280 return 0;
4281 }
4282
4283
4284 /*
4285 * in active-backup mode, we know that bond->curr_active_slave is always valid if
4286 * the bond has a usable interface.
4287 */
4288 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4289 {
4290 struct bonding *bond = netdev_priv(bond_dev);
4291 int res = 1;
4292
4293 read_lock(&bond->lock);
4294 read_lock(&bond->curr_slave_lock);
4295
4296 if (!BOND_IS_OK(bond))
4297 goto out;
4298
4299 if (!bond->curr_active_slave)
4300 goto out;
4301
4302 res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4303
4304 out:
4305 if (res)
4306 /* no suitable interface, frame not sent */
4307 dev_kfree_skb(skb);
4308
4309 read_unlock(&bond->curr_slave_lock);
4310 read_unlock(&bond->lock);
4311 return 0;
4312 }
4313
4314 /*
4315 * In bond_xmit_xor() , we determine the output device by using a pre-
4316 * determined xmit_hash_policy(), If the selected device is not enabled,
4317 * find the next active slave.
4318 */
4319 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4320 {
4321 struct bonding *bond = netdev_priv(bond_dev);
4322 struct slave *slave, *start_at;
4323 int slave_no;
4324 int i;
4325 int res = 1;
4326
4327 read_lock(&bond->lock);
4328
4329 if (!BOND_IS_OK(bond))
4330 goto out;
4331
4332 slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4333
4334 bond_for_each_slave(bond, slave, i) {
4335 slave_no--;
4336 if (slave_no < 0)
4337 break;
4338 }
4339
4340 start_at = slave;
4341
4342 bond_for_each_slave_from(bond, slave, i, start_at) {
4343 if (IS_UP(slave->dev) &&
4344 (slave->link == BOND_LINK_UP) &&
4345 (slave->state == BOND_STATE_ACTIVE)) {
4346 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4347 break;
4348 }
4349 }
4350
4351 out:
4352 if (res) {
4353 /* no suitable interface, frame not sent */
4354 dev_kfree_skb(skb);
4355 }
4356 read_unlock(&bond->lock);
4357 return 0;
4358 }
4359
4360 /*
4361 * in broadcast mode, we send everything to all usable interfaces.
4362 */
4363 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4364 {
4365 struct bonding *bond = netdev_priv(bond_dev);
4366 struct slave *slave, *start_at;
4367 struct net_device *tx_dev = NULL;
4368 int i;
4369 int res = 1;
4370
4371 read_lock(&bond->lock);
4372
4373 if (!BOND_IS_OK(bond))
4374 goto out;
4375
4376 read_lock(&bond->curr_slave_lock);
4377 start_at = bond->curr_active_slave;
4378 read_unlock(&bond->curr_slave_lock);
4379
4380 if (!start_at)
4381 goto out;
4382
4383 bond_for_each_slave_from(bond, slave, i, start_at) {
4384 if (IS_UP(slave->dev) &&
4385 (slave->link == BOND_LINK_UP) &&
4386 (slave->state == BOND_STATE_ACTIVE)) {
4387 if (tx_dev) {
4388 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4389 if (!skb2) {
4390 pr_err(DRV_NAME
4391 ": %s: Error: bond_xmit_broadcast(): "
4392 "skb_clone() failed\n",
4393 bond_dev->name);
4394 continue;
4395 }
4396
4397 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4398 if (res) {
4399 dev_kfree_skb(skb2);
4400 continue;
4401 }
4402 }
4403 tx_dev = slave->dev;
4404 }
4405 }
4406
4407 if (tx_dev)
4408 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4409
4410 out:
4411 if (res)
4412 /* no suitable interface, frame not sent */
4413 dev_kfree_skb(skb);
4414
4415 /* frame sent to all suitable interfaces */
4416 read_unlock(&bond->lock);
4417 return 0;
4418 }
4419
4420 /*------------------------- Device initialization ---------------------------*/
4421
4422 static void bond_set_xmit_hash_policy(struct bonding *bond)
4423 {
4424 switch (bond->params.xmit_policy) {
4425 case BOND_XMIT_POLICY_LAYER23:
4426 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4427 break;
4428 case BOND_XMIT_POLICY_LAYER34:
4429 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4430 break;
4431 case BOND_XMIT_POLICY_LAYER2:
4432 default:
4433 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4434 break;
4435 }
4436 }
4437
4438 static int bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4439 {
4440 const struct bonding *bond = netdev_priv(dev);
4441
4442 switch (bond->params.mode) {
4443 case BOND_MODE_ROUNDROBIN:
4444 return bond_xmit_roundrobin(skb, dev);
4445 case BOND_MODE_ACTIVEBACKUP:
4446 return bond_xmit_activebackup(skb, dev);
4447 case BOND_MODE_XOR:
4448 return bond_xmit_xor(skb, dev);
4449 case BOND_MODE_BROADCAST:
4450 return bond_xmit_broadcast(skb, dev);
4451 case BOND_MODE_8023AD:
4452 return bond_3ad_xmit_xor(skb, dev);
4453 case BOND_MODE_ALB:
4454 case BOND_MODE_TLB:
4455 return bond_alb_xmit(skb, dev);
4456 default:
4457 /* Should never happen, mode already checked */
4458 pr_err(DRV_NAME ": %s: Error: Unknown bonding mode %d\n",
4459 dev->name, bond->params.mode);
4460 WARN_ON_ONCE(1);
4461 dev_kfree_skb(skb);
4462 return NETDEV_TX_OK;
4463 }
4464 }
4465
4466
4467 /*
4468 * set bond mode specific net device operations
4469 */
4470 void bond_set_mode_ops(struct bonding *bond, int mode)
4471 {
4472 struct net_device *bond_dev = bond->dev;
4473
4474 switch (mode) {
4475 case BOND_MODE_ROUNDROBIN:
4476 break;
4477 case BOND_MODE_ACTIVEBACKUP:
4478 break;
4479 case BOND_MODE_XOR:
4480 bond_set_xmit_hash_policy(bond);
4481 break;
4482 case BOND_MODE_BROADCAST:
4483 break;
4484 case BOND_MODE_8023AD:
4485 bond_set_master_3ad_flags(bond);
4486 bond_set_xmit_hash_policy(bond);
4487 break;
4488 case BOND_MODE_ALB:
4489 bond_set_master_alb_flags(bond);
4490 /* FALLTHRU */
4491 case BOND_MODE_TLB:
4492 break;
4493 default:
4494 /* Should never happen, mode already checked */
4495 pr_err(DRV_NAME
4496 ": %s: Error: Unknown bonding mode %d\n",
4497 bond_dev->name,
4498 mode);
4499 break;
4500 }
4501 }
4502
4503 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4504 struct ethtool_drvinfo *drvinfo)
4505 {
4506 strncpy(drvinfo->driver, DRV_NAME, 32);
4507 strncpy(drvinfo->version, DRV_VERSION, 32);
4508 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4509 }
4510
4511 static const struct ethtool_ops bond_ethtool_ops = {
4512 .get_drvinfo = bond_ethtool_get_drvinfo,
4513 .get_link = ethtool_op_get_link,
4514 .get_tx_csum = ethtool_op_get_tx_csum,
4515 .get_sg = ethtool_op_get_sg,
4516 .get_tso = ethtool_op_get_tso,
4517 .get_ufo = ethtool_op_get_ufo,
4518 .get_flags = ethtool_op_get_flags,
4519 };
4520
4521 static const struct net_device_ops bond_netdev_ops = {
4522 .ndo_init = bond_init,
4523 .ndo_uninit = bond_uninit,
4524 .ndo_open = bond_open,
4525 .ndo_stop = bond_close,
4526 .ndo_start_xmit = bond_start_xmit,
4527 .ndo_get_stats = bond_get_stats,
4528 .ndo_do_ioctl = bond_do_ioctl,
4529 .ndo_set_multicast_list = bond_set_multicast_list,
4530 .ndo_change_mtu = bond_change_mtu,
4531 .ndo_set_mac_address = bond_set_mac_address,
4532 .ndo_neigh_setup = bond_neigh_setup,
4533 .ndo_vlan_rx_register = bond_vlan_rx_register,
4534 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4535 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4536 };
4537
4538 static void bond_setup(struct net_device *bond_dev)
4539 {
4540 struct bonding *bond = netdev_priv(bond_dev);
4541
4542 /* initialize rwlocks */
4543 rwlock_init(&bond->lock);
4544 rwlock_init(&bond->curr_slave_lock);
4545
4546 bond->params = bonding_defaults;
4547
4548 /* Initialize pointers */
4549 bond->dev = bond_dev;
4550 INIT_LIST_HEAD(&bond->vlan_list);
4551
4552 /* Initialize the device entry points */
4553 ether_setup(bond_dev);
4554 bond_dev->netdev_ops = &bond_netdev_ops;
4555 bond_dev->ethtool_ops = &bond_ethtool_ops;
4556 bond_set_mode_ops(bond, bond->params.mode);
4557
4558 bond_dev->destructor = free_netdev;
4559
4560 /* Initialize the device options */
4561 bond_dev->tx_queue_len = 0;
4562 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4563 bond_dev->priv_flags |= IFF_BONDING;
4564 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
4565
4566 if (bond->params.arp_interval)
4567 bond_dev->priv_flags |= IFF_MASTER_ARPMON;
4568
4569 /* At first, we block adding VLANs. That's the only way to
4570 * prevent problems that occur when adding VLANs over an
4571 * empty bond. The block will be removed once non-challenged
4572 * slaves are enslaved.
4573 */
4574 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4575
4576 /* don't acquire bond device's netif_tx_lock when
4577 * transmitting */
4578 bond_dev->features |= NETIF_F_LLTX;
4579
4580 /* By default, we declare the bond to be fully
4581 * VLAN hardware accelerated capable. Special
4582 * care is taken in the various xmit functions
4583 * when there are slaves that are not hw accel
4584 * capable
4585 */
4586 bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4587 NETIF_F_HW_VLAN_RX |
4588 NETIF_F_HW_VLAN_FILTER);
4589
4590 }
4591
4592 static void bond_work_cancel_all(struct bonding *bond)
4593 {
4594 write_lock_bh(&bond->lock);
4595 bond->kill_timers = 1;
4596 write_unlock_bh(&bond->lock);
4597
4598 if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4599 cancel_delayed_work(&bond->mii_work);
4600
4601 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4602 cancel_delayed_work(&bond->arp_work);
4603
4604 if (bond->params.mode == BOND_MODE_ALB &&
4605 delayed_work_pending(&bond->alb_work))
4606 cancel_delayed_work(&bond->alb_work);
4607
4608 if (bond->params.mode == BOND_MODE_8023AD &&
4609 delayed_work_pending(&bond->ad_work))
4610 cancel_delayed_work(&bond->ad_work);
4611 }
4612
4613 /* De-initialize device specific data.
4614 * Caller must hold rtnl_lock.
4615 */
4616 static void bond_deinit(struct net_device *bond_dev)
4617 {
4618 struct bonding *bond = netdev_priv(bond_dev);
4619
4620 list_del(&bond->bond_list);
4621
4622 bond_work_cancel_all(bond);
4623
4624 bond_remove_proc_entry(bond);
4625 }
4626
4627 /* Unregister and free all bond devices.
4628 * Caller must hold rtnl_lock.
4629 */
4630 static void bond_free_all(void)
4631 {
4632 struct bonding *bond, *nxt;
4633
4634 list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4635 struct net_device *bond_dev = bond->dev;
4636
4637 bond_work_cancel_all(bond);
4638 /* Release the bonded slaves */
4639 bond_release_all(bond_dev);
4640 unregister_netdevice(bond_dev);
4641 }
4642
4643 bond_destroy_proc_dir();
4644 }
4645
4646 /*------------------------- Module initialization ---------------------------*/
4647
4648 /*
4649 * Convert string input module parms. Accept either the
4650 * number of the mode or its string name. A bit complicated because
4651 * some mode names are substrings of other names, and calls from sysfs
4652 * may have whitespace in the name (trailing newlines, for example).
4653 */
4654 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4655 {
4656 int modeint = -1, i, rv;
4657 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4658
4659 for (p = (char *)buf; *p; p++)
4660 if (!(isdigit(*p) || isspace(*p)))
4661 break;
4662
4663 if (*p)
4664 rv = sscanf(buf, "%20s", modestr);
4665 else
4666 rv = sscanf(buf, "%d", &modeint);
4667
4668 if (!rv)
4669 return -1;
4670
4671 for (i = 0; tbl[i].modename; i++) {
4672 if (modeint == tbl[i].mode)
4673 return tbl[i].mode;
4674 if (strcmp(modestr, tbl[i].modename) == 0)
4675 return tbl[i].mode;
4676 }
4677
4678 return -1;
4679 }
4680
4681 static int bond_check_params(struct bond_params *params)
4682 {
4683 int arp_validate_value, fail_over_mac_value;
4684
4685 /*
4686 * Convert string parameters.
4687 */
4688 if (mode) {
4689 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4690 if (bond_mode == -1) {
4691 pr_err(DRV_NAME
4692 ": Error: Invalid bonding mode \"%s\"\n",
4693 mode == NULL ? "NULL" : mode);
4694 return -EINVAL;
4695 }
4696 }
4697
4698 if (xmit_hash_policy) {
4699 if ((bond_mode != BOND_MODE_XOR) &&
4700 (bond_mode != BOND_MODE_8023AD)) {
4701 pr_info(DRV_NAME
4702 ": xor_mode param is irrelevant in mode %s\n",
4703 bond_mode_name(bond_mode));
4704 } else {
4705 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4706 xmit_hashtype_tbl);
4707 if (xmit_hashtype == -1) {
4708 pr_err(DRV_NAME
4709 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4710 xmit_hash_policy == NULL ? "NULL" :
4711 xmit_hash_policy);
4712 return -EINVAL;
4713 }
4714 }
4715 }
4716
4717 if (lacp_rate) {
4718 if (bond_mode != BOND_MODE_8023AD) {
4719 pr_info(DRV_NAME
4720 ": lacp_rate param is irrelevant in mode %s\n",
4721 bond_mode_name(bond_mode));
4722 } else {
4723 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4724 if (lacp_fast == -1) {
4725 pr_err(DRV_NAME
4726 ": Error: Invalid lacp rate \"%s\"\n",
4727 lacp_rate == NULL ? "NULL" : lacp_rate);
4728 return -EINVAL;
4729 }
4730 }
4731 }
4732
4733 if (ad_select) {
4734 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4735 if (params->ad_select == -1) {
4736 pr_err(DRV_NAME
4737 ": Error: Invalid ad_select \"%s\"\n",
4738 ad_select == NULL ? "NULL" : ad_select);
4739 return -EINVAL;
4740 }
4741
4742 if (bond_mode != BOND_MODE_8023AD) {
4743 pr_warning(DRV_NAME
4744 ": ad_select param only affects 802.3ad mode\n");
4745 }
4746 } else {
4747 params->ad_select = BOND_AD_STABLE;
4748 }
4749
4750 if (max_bonds < 0 || max_bonds > INT_MAX) {
4751 pr_warning(DRV_NAME
4752 ": Warning: max_bonds (%d) not in range %d-%d, so it "
4753 "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4754 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4755 max_bonds = BOND_DEFAULT_MAX_BONDS;
4756 }
4757
4758 if (miimon < 0) {
4759 pr_warning(DRV_NAME
4760 ": Warning: miimon module parameter (%d), "
4761 "not in range 0-%d, so it was reset to %d\n",
4762 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4763 miimon = BOND_LINK_MON_INTERV;
4764 }
4765
4766 if (updelay < 0) {
4767 pr_warning(DRV_NAME
4768 ": Warning: updelay module parameter (%d), "
4769 "not in range 0-%d, so it was reset to 0\n",
4770 updelay, INT_MAX);
4771 updelay = 0;
4772 }
4773
4774 if (downdelay < 0) {
4775 pr_warning(DRV_NAME
4776 ": Warning: downdelay module parameter (%d), "
4777 "not in range 0-%d, so it was reset to 0\n",
4778 downdelay, INT_MAX);
4779 downdelay = 0;
4780 }
4781
4782 if ((use_carrier != 0) && (use_carrier != 1)) {
4783 pr_warning(DRV_NAME
4784 ": Warning: use_carrier module parameter (%d), "
4785 "not of valid value (0/1), so it was set to 1\n",
4786 use_carrier);
4787 use_carrier = 1;
4788 }
4789
4790 if (num_grat_arp < 0 || num_grat_arp > 255) {
4791 pr_warning(DRV_NAME
4792 ": Warning: num_grat_arp (%d) not in range 0-255 so it "
4793 "was reset to 1 \n", num_grat_arp);
4794 num_grat_arp = 1;
4795 }
4796
4797 if (num_unsol_na < 0 || num_unsol_na > 255) {
4798 pr_warning(DRV_NAME
4799 ": Warning: num_unsol_na (%d) not in range 0-255 so it "
4800 "was reset to 1 \n", num_unsol_na);
4801 num_unsol_na = 1;
4802 }
4803
4804 /* reset values for 802.3ad */
4805 if (bond_mode == BOND_MODE_8023AD) {
4806 if (!miimon) {
4807 pr_warning(DRV_NAME
4808 ": Warning: miimon must be specified, "
4809 "otherwise bonding will not detect link "
4810 "failure, speed and duplex which are "
4811 "essential for 802.3ad operation\n");
4812 pr_warning("Forcing miimon to 100msec\n");
4813 miimon = 100;
4814 }
4815 }
4816
4817 /* reset values for TLB/ALB */
4818 if ((bond_mode == BOND_MODE_TLB) ||
4819 (bond_mode == BOND_MODE_ALB)) {
4820 if (!miimon) {
4821 pr_warning(DRV_NAME
4822 ": Warning: miimon must be specified, "
4823 "otherwise bonding will not detect link "
4824 "failure and link speed which are essential "
4825 "for TLB/ALB load balancing\n");
4826 pr_warning("Forcing miimon to 100msec\n");
4827 miimon = 100;
4828 }
4829 }
4830
4831 if (bond_mode == BOND_MODE_ALB) {
4832 printk(KERN_NOTICE DRV_NAME
4833 ": In ALB mode you might experience client "
4834 "disconnections upon reconnection of a link if the "
4835 "bonding module updelay parameter (%d msec) is "
4836 "incompatible with the forwarding delay time of the "
4837 "switch\n",
4838 updelay);
4839 }
4840
4841 if (!miimon) {
4842 if (updelay || downdelay) {
4843 /* just warn the user the up/down delay will have
4844 * no effect since miimon is zero...
4845 */
4846 pr_warning(DRV_NAME
4847 ": Warning: miimon module parameter not set "
4848 "and updelay (%d) or downdelay (%d) module "
4849 "parameter is set; updelay and downdelay have "
4850 "no effect unless miimon is set\n",
4851 updelay, downdelay);
4852 }
4853 } else {
4854 /* don't allow arp monitoring */
4855 if (arp_interval) {
4856 pr_warning(DRV_NAME
4857 ": Warning: miimon (%d) and arp_interval (%d) "
4858 "can't be used simultaneously, disabling ARP "
4859 "monitoring\n",
4860 miimon, arp_interval);
4861 arp_interval = 0;
4862 }
4863
4864 if ((updelay % miimon) != 0) {
4865 pr_warning(DRV_NAME
4866 ": Warning: updelay (%d) is not a multiple "
4867 "of miimon (%d), updelay rounded to %d ms\n",
4868 updelay, miimon, (updelay / miimon) * miimon);
4869 }
4870
4871 updelay /= miimon;
4872
4873 if ((downdelay % miimon) != 0) {
4874 pr_warning(DRV_NAME
4875 ": Warning: downdelay (%d) is not a multiple "
4876 "of miimon (%d), downdelay rounded to %d ms\n",
4877 downdelay, miimon,
4878 (downdelay / miimon) * miimon);
4879 }
4880
4881 downdelay /= miimon;
4882 }
4883
4884 if (arp_interval < 0) {
4885 pr_warning(DRV_NAME
4886 ": Warning: arp_interval module parameter (%d) "
4887 ", not in range 0-%d, so it was reset to %d\n",
4888 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4889 arp_interval = BOND_LINK_ARP_INTERV;
4890 }
4891
4892 for (arp_ip_count = 0;
4893 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4894 arp_ip_count++) {
4895 /* not complete check, but should be good enough to
4896 catch mistakes */
4897 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4898 pr_warning(DRV_NAME
4899 ": Warning: bad arp_ip_target module parameter "
4900 "(%s), ARP monitoring will not be performed\n",
4901 arp_ip_target[arp_ip_count]);
4902 arp_interval = 0;
4903 } else {
4904 __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4905 arp_target[arp_ip_count] = ip;
4906 }
4907 }
4908
4909 if (arp_interval && !arp_ip_count) {
4910 /* don't allow arping if no arp_ip_target given... */
4911 pr_warning(DRV_NAME
4912 ": Warning: arp_interval module parameter (%d) "
4913 "specified without providing an arp_ip_target "
4914 "parameter, arp_interval was reset to 0\n",
4915 arp_interval);
4916 arp_interval = 0;
4917 }
4918
4919 if (arp_validate) {
4920 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4921 pr_err(DRV_NAME
4922 ": arp_validate only supported in active-backup mode\n");
4923 return -EINVAL;
4924 }
4925 if (!arp_interval) {
4926 pr_err(DRV_NAME
4927 ": arp_validate requires arp_interval\n");
4928 return -EINVAL;
4929 }
4930
4931 arp_validate_value = bond_parse_parm(arp_validate,
4932 arp_validate_tbl);
4933 if (arp_validate_value == -1) {
4934 pr_err(DRV_NAME
4935 ": Error: invalid arp_validate \"%s\"\n",
4936 arp_validate == NULL ? "NULL" : arp_validate);
4937 return -EINVAL;
4938 }
4939 } else
4940 arp_validate_value = 0;
4941
4942 if (miimon) {
4943 pr_info(DRV_NAME
4944 ": MII link monitoring set to %d ms\n",
4945 miimon);
4946 } else if (arp_interval) {
4947 int i;
4948
4949 pr_info(DRV_NAME ": ARP monitoring set to %d ms,"
4950 " validate %s, with %d target(s):",
4951 arp_interval,
4952 arp_validate_tbl[arp_validate_value].modename,
4953 arp_ip_count);
4954
4955 for (i = 0; i < arp_ip_count; i++)
4956 printk(" %s", arp_ip_target[i]);
4957
4958 printk("\n");
4959
4960 } else if (max_bonds) {
4961 /* miimon and arp_interval not set, we need one so things
4962 * work as expected, see bonding.txt for details
4963 */
4964 pr_warning(DRV_NAME
4965 ": Warning: either miimon or arp_interval and "
4966 "arp_ip_target module parameters must be specified, "
4967 "otherwise bonding will not detect link failures! see "
4968 "bonding.txt for details.\n");
4969 }
4970
4971 if (primary && !USES_PRIMARY(bond_mode)) {
4972 /* currently, using a primary only makes sense
4973 * in active backup, TLB or ALB modes
4974 */
4975 pr_warning(DRV_NAME
4976 ": Warning: %s primary device specified but has no "
4977 "effect in %s mode\n",
4978 primary, bond_mode_name(bond_mode));
4979 primary = NULL;
4980 }
4981
4982 if (fail_over_mac) {
4983 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4984 fail_over_mac_tbl);
4985 if (fail_over_mac_value == -1) {
4986 pr_err(DRV_NAME
4987 ": Error: invalid fail_over_mac \"%s\"\n",
4988 arp_validate == NULL ? "NULL" : arp_validate);
4989 return -EINVAL;
4990 }
4991
4992 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4993 pr_warning(DRV_NAME
4994 ": Warning: fail_over_mac only affects "
4995 "active-backup mode.\n");
4996 } else {
4997 fail_over_mac_value = BOND_FOM_NONE;
4998 }
4999
5000 /* fill params struct with the proper values */
5001 params->mode = bond_mode;
5002 params->xmit_policy = xmit_hashtype;
5003 params->miimon = miimon;
5004 params->num_grat_arp = num_grat_arp;
5005 params->num_unsol_na = num_unsol_na;
5006 params->arp_interval = arp_interval;
5007 params->arp_validate = arp_validate_value;
5008 params->updelay = updelay;
5009 params->downdelay = downdelay;
5010 params->use_carrier = use_carrier;
5011 params->lacp_fast = lacp_fast;
5012 params->primary[0] = 0;
5013 params->fail_over_mac = fail_over_mac_value;
5014
5015 if (primary) {
5016 strncpy(params->primary, primary, IFNAMSIZ);
5017 params->primary[IFNAMSIZ - 1] = 0;
5018 }
5019
5020 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5021
5022 return 0;
5023 }
5024
5025 static struct lock_class_key bonding_netdev_xmit_lock_key;
5026 static struct lock_class_key bonding_netdev_addr_lock_key;
5027
5028 static void bond_set_lockdep_class_one(struct net_device *dev,
5029 struct netdev_queue *txq,
5030 void *_unused)
5031 {
5032 lockdep_set_class(&txq->_xmit_lock,
5033 &bonding_netdev_xmit_lock_key);
5034 }
5035
5036 static void bond_set_lockdep_class(struct net_device *dev)
5037 {
5038 lockdep_set_class(&dev->addr_list_lock,
5039 &bonding_netdev_addr_lock_key);
5040 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
5041 }
5042
5043 /*
5044 * Called from registration process
5045 */
5046 static int bond_init(struct net_device *bond_dev)
5047 {
5048 struct bonding *bond = netdev_priv(bond_dev);
5049
5050 pr_debug("Begin bond_init for %s\n", bond_dev->name);
5051
5052 bond->wq = create_singlethread_workqueue(bond_dev->name);
5053 if (!bond->wq)
5054 return -ENOMEM;
5055
5056 bond_set_lockdep_class(bond_dev);
5057
5058 netif_carrier_off(bond_dev);
5059
5060 bond_create_proc_entry(bond);
5061 list_add_tail(&bond->bond_list, &bond_dev_list);
5062
5063 return 0;
5064 }
5065
5066 /* Create a new bond based on the specified name and bonding parameters.
5067 * If name is NULL, obtain a suitable "bond%d" name for us.
5068 * Caller must NOT hold rtnl_lock; we need to release it here before we
5069 * set up our sysfs entries.
5070 */
5071 int bond_create(const char *name)
5072 {
5073 struct net_device *bond_dev;
5074 int res;
5075
5076 rtnl_lock();
5077 /* Check to see if the bond already exists. */
5078 /* FIXME: pass netns from caller */
5079 if (name && __dev_get_by_name(&init_net, name)) {
5080 pr_err(DRV_NAME ": cannot add bond %s; already exists\n",
5081 name);
5082 res = -EEXIST;
5083 goto out_rtnl;
5084 }
5085
5086 bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
5087 bond_setup);
5088 if (!bond_dev) {
5089 pr_err(DRV_NAME ": %s: eek! can't alloc netdev!\n",
5090 name);
5091 res = -ENOMEM;
5092 goto out_rtnl;
5093 }
5094
5095 if (!name) {
5096 res = dev_alloc_name(bond_dev, "bond%d");
5097 if (res < 0)
5098 goto out_netdev;
5099 }
5100
5101 res = register_netdevice(bond_dev);
5102 if (res < 0)
5103 goto out_bond;
5104
5105 res = bond_create_sysfs_entry(netdev_priv(bond_dev));
5106 if (res < 0)
5107 goto out_unreg;
5108
5109 rtnl_unlock();
5110 return 0;
5111
5112 out_unreg:
5113 unregister_netdevice(bond_dev);
5114 out_bond:
5115 bond_deinit(bond_dev);
5116 out_netdev:
5117 free_netdev(bond_dev);
5118 out_rtnl:
5119 rtnl_unlock();
5120 return res;
5121 }
5122
5123 static int __init bonding_init(void)
5124 {
5125 int i;
5126 int res;
5127
5128 pr_info("%s", version);
5129
5130 res = bond_check_params(&bonding_defaults);
5131 if (res)
5132 goto out;
5133
5134 bond_create_proc_dir();
5135
5136 for (i = 0; i < max_bonds; i++) {
5137 res = bond_create(NULL);
5138 if (res)
5139 goto err;
5140 }
5141
5142 res = bond_create_sysfs();
5143 if (res)
5144 goto err;
5145
5146 register_netdevice_notifier(&bond_netdev_notifier);
5147 register_inetaddr_notifier(&bond_inetaddr_notifier);
5148 bond_register_ipv6_notifier();
5149
5150 goto out;
5151 err:
5152 rtnl_lock();
5153 bond_free_all();
5154 rtnl_unlock();
5155 out:
5156 return res;
5157
5158 }
5159
5160 static void __exit bonding_exit(void)
5161 {
5162 unregister_netdevice_notifier(&bond_netdev_notifier);
5163 unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5164 bond_unregister_ipv6_notifier();
5165
5166 bond_destroy_sysfs();
5167
5168 rtnl_lock();
5169 bond_free_all();
5170 rtnl_unlock();
5171 }
5172
5173 module_init(bonding_init);
5174 module_exit(bonding_exit);
5175 MODULE_LICENSE("GPL");
5176 MODULE_VERSION(DRV_VERSION);
5177 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5178 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
Linux kernel - Deliverables
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