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Merge branch 'topic/ctxfi' into for-linus
[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 (bond_dev->type != slave_dev->type) {
1463 dev_close(bond_dev);
1464 pr_debug("%s: change device type from %d to %d\n",
1465 bond_dev->name, bond_dev->type, slave_dev->type);
1466 if (slave_dev->type != ARPHRD_ETHER)
1467 bond_setup_by_slave(bond_dev, slave_dev);
1468 else
1469 ether_setup(bond_dev);
1470 dev_open(bond_dev);
1471 }
1472 } else if (bond_dev->type != slave_dev->type) {
1473 pr_err(DRV_NAME ": %s ether type (%d) is different "
1474 "from other slaves (%d), can not enslave it.\n",
1475 slave_dev->name,
1476 slave_dev->type, bond_dev->type);
1477 res = -EINVAL;
1478 goto err_undo_flags;
1479 }
1480
1481 if (slave_ops->ndo_set_mac_address == NULL) {
1482 if (bond->slave_cnt == 0) {
1483 pr_warning(DRV_NAME
1484 ": %s: Warning: The first slave device "
1485 "specified does not support setting the MAC "
1486 "address. Setting fail_over_mac to active.",
1487 bond_dev->name);
1488 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1489 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1490 pr_err(DRV_NAME
1491 ": %s: Error: The slave device specified "
1492 "does not support setting the MAC address, "
1493 "but fail_over_mac is not set to active.\n"
1494 , bond_dev->name);
1495 res = -EOPNOTSUPP;
1496 goto err_undo_flags;
1497 }
1498 }
1499
1500 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1501 if (!new_slave) {
1502 res = -ENOMEM;
1503 goto err_undo_flags;
1504 }
1505
1506 /* save slave's original flags before calling
1507 * netdev_set_master and dev_open
1508 */
1509 new_slave->original_flags = slave_dev->flags;
1510
1511 /*
1512 * Save slave's original ("permanent") mac address for modes
1513 * that need it, and for restoring it upon release, and then
1514 * set it to the master's address
1515 */
1516 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1517
1518 if (!bond->params.fail_over_mac) {
1519 /*
1520 * Set slave to master's mac address. The application already
1521 * set the master's mac address to that of the first slave
1522 */
1523 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1524 addr.sa_family = slave_dev->type;
1525 res = dev_set_mac_address(slave_dev, &addr);
1526 if (res) {
1527 pr_debug("Error %d calling set_mac_address\n", res);
1528 goto err_free;
1529 }
1530 }
1531
1532 res = netdev_set_master(slave_dev, bond_dev);
1533 if (res) {
1534 pr_debug("Error %d calling netdev_set_master\n", res);
1535 goto err_restore_mac;
1536 }
1537 /* open the slave since the application closed it */
1538 res = dev_open(slave_dev);
1539 if (res) {
1540 pr_debug("Opening slave %s failed\n", slave_dev->name);
1541 goto err_unset_master;
1542 }
1543
1544 new_slave->dev = slave_dev;
1545 slave_dev->priv_flags |= IFF_BONDING;
1546
1547 if (bond_is_lb(bond)) {
1548 /* bond_alb_init_slave() must be called before all other stages since
1549 * it might fail and we do not want to have to undo everything
1550 */
1551 res = bond_alb_init_slave(bond, new_slave);
1552 if (res)
1553 goto err_close;
1554 }
1555
1556 /* If the mode USES_PRIMARY, then the new slave gets the
1557 * master's promisc (and mc) settings only if it becomes the
1558 * curr_active_slave, and that is taken care of later when calling
1559 * bond_change_active()
1560 */
1561 if (!USES_PRIMARY(bond->params.mode)) {
1562 /* set promiscuity level to new slave */
1563 if (bond_dev->flags & IFF_PROMISC) {
1564 res = dev_set_promiscuity(slave_dev, 1);
1565 if (res)
1566 goto err_close;
1567 }
1568
1569 /* set allmulti level to new slave */
1570 if (bond_dev->flags & IFF_ALLMULTI) {
1571 res = dev_set_allmulti(slave_dev, 1);
1572 if (res)
1573 goto err_close;
1574 }
1575
1576 netif_addr_lock_bh(bond_dev);
1577 /* upload master's mc_list to new slave */
1578 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next)
1579 dev_mc_add(slave_dev, dmi->dmi_addr,
1580 dmi->dmi_addrlen, 0);
1581 netif_addr_unlock_bh(bond_dev);
1582 }
1583
1584 if (bond->params.mode == BOND_MODE_8023AD) {
1585 /* add lacpdu mc addr to mc list */
1586 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1587
1588 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1589 }
1590
1591 bond_add_vlans_on_slave(bond, slave_dev);
1592
1593 write_lock_bh(&bond->lock);
1594
1595 bond_attach_slave(bond, new_slave);
1596
1597 new_slave->delay = 0;
1598 new_slave->link_failure_count = 0;
1599
1600 bond_compute_features(bond);
1601
1602 write_unlock_bh(&bond->lock);
1603
1604 read_lock(&bond->lock);
1605
1606 new_slave->last_arp_rx = jiffies;
1607
1608 if (bond->params.miimon && !bond->params.use_carrier) {
1609 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1610
1611 if ((link_reporting == -1) && !bond->params.arp_interval) {
1612 /*
1613 * miimon is set but a bonded network driver
1614 * does not support ETHTOOL/MII and
1615 * arp_interval is not set. Note: if
1616 * use_carrier is enabled, we will never go
1617 * here (because netif_carrier is always
1618 * supported); thus, we don't need to change
1619 * the messages for netif_carrier.
1620 */
1621 pr_warning(DRV_NAME
1622 ": %s: Warning: MII and ETHTOOL support not "
1623 "available for interface %s, and "
1624 "arp_interval/arp_ip_target module parameters "
1625 "not specified, thus bonding will not detect "
1626 "link failures! see bonding.txt for details.\n",
1627 bond_dev->name, slave_dev->name);
1628 } else if (link_reporting == -1) {
1629 /* unable get link status using mii/ethtool */
1630 pr_warning(DRV_NAME
1631 ": %s: Warning: can't get link status from "
1632 "interface %s; the network driver associated "
1633 "with this interface does not support MII or "
1634 "ETHTOOL link status reporting, thus miimon "
1635 "has no effect on this interface.\n",
1636 bond_dev->name, slave_dev->name);
1637 }
1638 }
1639
1640 /* check for initial state */
1641 if (!bond->params.miimon ||
1642 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1643 if (bond->params.updelay) {
1644 pr_debug("Initial state of slave_dev is "
1645 "BOND_LINK_BACK\n");
1646 new_slave->link = BOND_LINK_BACK;
1647 new_slave->delay = bond->params.updelay;
1648 } else {
1649 pr_debug("Initial state of slave_dev is "
1650 "BOND_LINK_UP\n");
1651 new_slave->link = BOND_LINK_UP;
1652 }
1653 new_slave->jiffies = jiffies;
1654 } else {
1655 pr_debug("Initial state of slave_dev is "
1656 "BOND_LINK_DOWN\n");
1657 new_slave->link = BOND_LINK_DOWN;
1658 }
1659
1660 if (bond_update_speed_duplex(new_slave) &&
1661 (new_slave->link != BOND_LINK_DOWN)) {
1662 pr_warning(DRV_NAME
1663 ": %s: Warning: failed to get speed and duplex from %s, "
1664 "assumed to be 100Mb/sec and Full.\n",
1665 bond_dev->name, new_slave->dev->name);
1666
1667 if (bond->params.mode == BOND_MODE_8023AD) {
1668 pr_warning(DRV_NAME
1669 ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1670 "support in base driver for proper aggregator "
1671 "selection.\n", bond_dev->name);
1672 }
1673 }
1674
1675 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1676 /* if there is a primary slave, remember it */
1677 if (strcmp(bond->params.primary, new_slave->dev->name) == 0)
1678 bond->primary_slave = new_slave;
1679 }
1680
1681 write_lock_bh(&bond->curr_slave_lock);
1682
1683 switch (bond->params.mode) {
1684 case BOND_MODE_ACTIVEBACKUP:
1685 bond_set_slave_inactive_flags(new_slave);
1686 bond_select_active_slave(bond);
1687 break;
1688 case BOND_MODE_8023AD:
1689 /* in 802.3ad mode, the internal mechanism
1690 * will activate the slaves in the selected
1691 * aggregator
1692 */
1693 bond_set_slave_inactive_flags(new_slave);
1694 /* if this is the first slave */
1695 if (bond->slave_cnt == 1) {
1696 SLAVE_AD_INFO(new_slave).id = 1;
1697 /* Initialize AD with the number of times that the AD timer is called in 1 second
1698 * can be called only after the mac address of the bond is set
1699 */
1700 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1701 bond->params.lacp_fast);
1702 } else {
1703 SLAVE_AD_INFO(new_slave).id =
1704 SLAVE_AD_INFO(new_slave->prev).id + 1;
1705 }
1706
1707 bond_3ad_bind_slave(new_slave);
1708 break;
1709 case BOND_MODE_TLB:
1710 case BOND_MODE_ALB:
1711 new_slave->state = BOND_STATE_ACTIVE;
1712 bond_set_slave_inactive_flags(new_slave);
1713 bond_select_active_slave(bond);
1714 break;
1715 default:
1716 pr_debug("This slave is always active in trunk mode\n");
1717
1718 /* always active in trunk mode */
1719 new_slave->state = BOND_STATE_ACTIVE;
1720
1721 /* In trunking mode there is little meaning to curr_active_slave
1722 * anyway (it holds no special properties of the bond device),
1723 * so we can change it without calling change_active_interface()
1724 */
1725 if (!bond->curr_active_slave)
1726 bond->curr_active_slave = new_slave;
1727
1728 break;
1729 } /* switch(bond_mode) */
1730
1731 write_unlock_bh(&bond->curr_slave_lock);
1732
1733 bond_set_carrier(bond);
1734
1735 read_unlock(&bond->lock);
1736
1737 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1738 if (res)
1739 goto err_close;
1740
1741 pr_info(DRV_NAME
1742 ": %s: enslaving %s as a%s interface with a%s link.\n",
1743 bond_dev->name, slave_dev->name,
1744 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1745 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1746
1747 /* enslave is successful */
1748 return 0;
1749
1750 /* Undo stages on error */
1751 err_close:
1752 dev_close(slave_dev);
1753
1754 err_unset_master:
1755 netdev_set_master(slave_dev, NULL);
1756
1757 err_restore_mac:
1758 if (!bond->params.fail_over_mac) {
1759 /* XXX TODO - fom follow mode needs to change master's
1760 * MAC if this slave's MAC is in use by the bond, or at
1761 * least print a warning.
1762 */
1763 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1764 addr.sa_family = slave_dev->type;
1765 dev_set_mac_address(slave_dev, &addr);
1766 }
1767
1768 err_free:
1769 kfree(new_slave);
1770
1771 err_undo_flags:
1772 bond_dev->features = old_features;
1773
1774 return res;
1775 }
1776
1777 /*
1778 * Try to release the slave device <slave> from the bond device <master>
1779 * It is legal to access curr_active_slave without a lock because all the function
1780 * is write-locked.
1781 *
1782 * The rules for slave state should be:
1783 * for Active/Backup:
1784 * Active stays on all backups go down
1785 * for Bonded connections:
1786 * The first up interface should be left on and all others downed.
1787 */
1788 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1789 {
1790 struct bonding *bond = netdev_priv(bond_dev);
1791 struct slave *slave, *oldcurrent;
1792 struct sockaddr addr;
1793 int mac_addr_differ;
1794
1795 /* slave is not a slave or master is not master of this slave */
1796 if (!(slave_dev->flags & IFF_SLAVE) ||
1797 (slave_dev->master != bond_dev)) {
1798 pr_err(DRV_NAME
1799 ": %s: Error: cannot release %s.\n",
1800 bond_dev->name, slave_dev->name);
1801 return -EINVAL;
1802 }
1803
1804 write_lock_bh(&bond->lock);
1805
1806 slave = bond_get_slave_by_dev(bond, slave_dev);
1807 if (!slave) {
1808 /* not a slave of this bond */
1809 pr_info(DRV_NAME
1810 ": %s: %s not enslaved\n",
1811 bond_dev->name, slave_dev->name);
1812 write_unlock_bh(&bond->lock);
1813 return -EINVAL;
1814 }
1815
1816 if (!bond->params.fail_over_mac) {
1817 mac_addr_differ = memcmp(bond_dev->dev_addr, slave->perm_hwaddr,
1818 ETH_ALEN);
1819 if (!mac_addr_differ && (bond->slave_cnt > 1))
1820 pr_warning(DRV_NAME
1821 ": %s: Warning: the permanent HWaddr of %s - "
1822 "%pM - is still in use by %s. "
1823 "Set the HWaddr of %s to a different address "
1824 "to avoid conflicts.\n",
1825 bond_dev->name, slave_dev->name,
1826 slave->perm_hwaddr,
1827 bond_dev->name, slave_dev->name);
1828 }
1829
1830 /* Inform AD package of unbinding of slave. */
1831 if (bond->params.mode == BOND_MODE_8023AD) {
1832 /* must be called before the slave is
1833 * detached from the list
1834 */
1835 bond_3ad_unbind_slave(slave);
1836 }
1837
1838 pr_info(DRV_NAME
1839 ": %s: releasing %s interface %s\n",
1840 bond_dev->name,
1841 (slave->state == BOND_STATE_ACTIVE)
1842 ? "active" : "backup",
1843 slave_dev->name);
1844
1845 oldcurrent = bond->curr_active_slave;
1846
1847 bond->current_arp_slave = NULL;
1848
1849 /* release the slave from its bond */
1850 bond_detach_slave(bond, slave);
1851
1852 bond_compute_features(bond);
1853
1854 if (bond->primary_slave == slave)
1855 bond->primary_slave = NULL;
1856
1857 if (oldcurrent == slave)
1858 bond_change_active_slave(bond, NULL);
1859
1860 if (bond_is_lb(bond)) {
1861 /* Must be called only after the slave has been
1862 * detached from the list and the curr_active_slave
1863 * has been cleared (if our_slave == old_current),
1864 * but before a new active slave is selected.
1865 */
1866 write_unlock_bh(&bond->lock);
1867 bond_alb_deinit_slave(bond, slave);
1868 write_lock_bh(&bond->lock);
1869 }
1870
1871 if (oldcurrent == slave) {
1872 /*
1873 * Note that we hold RTNL over this sequence, so there
1874 * is no concern that another slave add/remove event
1875 * will interfere.
1876 */
1877 write_unlock_bh(&bond->lock);
1878 read_lock(&bond->lock);
1879 write_lock_bh(&bond->curr_slave_lock);
1880
1881 bond_select_active_slave(bond);
1882
1883 write_unlock_bh(&bond->curr_slave_lock);
1884 read_unlock(&bond->lock);
1885 write_lock_bh(&bond->lock);
1886 }
1887
1888 if (bond->slave_cnt == 0) {
1889 bond_set_carrier(bond);
1890
1891 /* if the last slave was removed, zero the mac address
1892 * of the master so it will be set by the application
1893 * to the mac address of the first slave
1894 */
1895 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1896
1897 if (list_empty(&bond->vlan_list)) {
1898 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1899 } else {
1900 pr_warning(DRV_NAME
1901 ": %s: Warning: clearing HW address of %s while it "
1902 "still has VLANs.\n",
1903 bond_dev->name, bond_dev->name);
1904 pr_warning(DRV_NAME
1905 ": %s: When re-adding slaves, make sure the bond's "
1906 "HW address matches its VLANs'.\n",
1907 bond_dev->name);
1908 }
1909 } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1910 !bond_has_challenged_slaves(bond)) {
1911 pr_info(DRV_NAME
1912 ": %s: last VLAN challenged slave %s "
1913 "left bond %s. VLAN blocking is removed\n",
1914 bond_dev->name, slave_dev->name, bond_dev->name);
1915 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1916 }
1917
1918 write_unlock_bh(&bond->lock);
1919
1920 /* must do this from outside any spinlocks */
1921 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1922
1923 bond_del_vlans_from_slave(bond, slave_dev);
1924
1925 /* If the mode USES_PRIMARY, then we should only remove its
1926 * promisc and mc settings if it was the curr_active_slave, but that was
1927 * already taken care of above when we detached the slave
1928 */
1929 if (!USES_PRIMARY(bond->params.mode)) {
1930 /* unset promiscuity level from slave */
1931 if (bond_dev->flags & IFF_PROMISC)
1932 dev_set_promiscuity(slave_dev, -1);
1933
1934 /* unset allmulti level from slave */
1935 if (bond_dev->flags & IFF_ALLMULTI)
1936 dev_set_allmulti(slave_dev, -1);
1937
1938 /* flush master's mc_list from slave */
1939 netif_addr_lock_bh(bond_dev);
1940 bond_mc_list_flush(bond_dev, slave_dev);
1941 netif_addr_unlock_bh(bond_dev);
1942 }
1943
1944 netdev_set_master(slave_dev, NULL);
1945
1946 /* close slave before restoring its mac address */
1947 dev_close(slave_dev);
1948
1949 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1950 /* restore original ("permanent") mac address */
1951 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1952 addr.sa_family = slave_dev->type;
1953 dev_set_mac_address(slave_dev, &addr);
1954 }
1955
1956 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1957 IFF_SLAVE_INACTIVE | IFF_BONDING |
1958 IFF_SLAVE_NEEDARP);
1959
1960 kfree(slave);
1961
1962 return 0; /* deletion OK */
1963 }
1964
1965 /*
1966 * Destroy a bonding device.
1967 * Must be under rtnl_lock when this function is called.
1968 */
1969 static void bond_uninit(struct net_device *bond_dev)
1970 {
1971 struct bonding *bond = netdev_priv(bond_dev);
1972
1973 bond_deinit(bond_dev);
1974 bond_destroy_sysfs_entry(bond);
1975
1976 if (bond->wq)
1977 destroy_workqueue(bond->wq);
1978
1979 netif_addr_lock_bh(bond_dev);
1980 bond_mc_list_destroy(bond);
1981 netif_addr_unlock_bh(bond_dev);
1982 }
1983
1984 /*
1985 * First release a slave and than destroy the bond if no more slaves are left.
1986 * Must be under rtnl_lock when this function is called.
1987 */
1988 int bond_release_and_destroy(struct net_device *bond_dev,
1989 struct net_device *slave_dev)
1990 {
1991 struct bonding *bond = netdev_priv(bond_dev);
1992 int ret;
1993
1994 ret = bond_release(bond_dev, slave_dev);
1995 if ((ret == 0) && (bond->slave_cnt == 0)) {
1996 pr_info(DRV_NAME ": %s: destroying bond %s.\n",
1997 bond_dev->name, bond_dev->name);
1998 unregister_netdevice(bond_dev);
1999 }
2000 return ret;
2001 }
2002
2003 /*
2004 * This function releases all slaves.
2005 */
2006 static int bond_release_all(struct net_device *bond_dev)
2007 {
2008 struct bonding *bond = netdev_priv(bond_dev);
2009 struct slave *slave;
2010 struct net_device *slave_dev;
2011 struct sockaddr addr;
2012
2013 write_lock_bh(&bond->lock);
2014
2015 netif_carrier_off(bond_dev);
2016
2017 if (bond->slave_cnt == 0)
2018 goto out;
2019
2020 bond->current_arp_slave = NULL;
2021 bond->primary_slave = NULL;
2022 bond_change_active_slave(bond, NULL);
2023
2024 while ((slave = bond->first_slave) != NULL) {
2025 /* Inform AD package of unbinding of slave
2026 * before slave is detached from the list.
2027 */
2028 if (bond->params.mode == BOND_MODE_8023AD)
2029 bond_3ad_unbind_slave(slave);
2030
2031 slave_dev = slave->dev;
2032 bond_detach_slave(bond, slave);
2033
2034 /* now that the slave is detached, unlock and perform
2035 * all the undo steps that should not be called from
2036 * within a lock.
2037 */
2038 write_unlock_bh(&bond->lock);
2039
2040 if (bond_is_lb(bond)) {
2041 /* must be called only after the slave
2042 * has been detached from the list
2043 */
2044 bond_alb_deinit_slave(bond, slave);
2045 }
2046
2047 bond_compute_features(bond);
2048
2049 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2050 bond_del_vlans_from_slave(bond, slave_dev);
2051
2052 /* If the mode USES_PRIMARY, then we should only remove its
2053 * promisc and mc settings if it was the curr_active_slave, but that was
2054 * already taken care of above when we detached the slave
2055 */
2056 if (!USES_PRIMARY(bond->params.mode)) {
2057 /* unset promiscuity level from slave */
2058 if (bond_dev->flags & IFF_PROMISC)
2059 dev_set_promiscuity(slave_dev, -1);
2060
2061 /* unset allmulti level from slave */
2062 if (bond_dev->flags & IFF_ALLMULTI)
2063 dev_set_allmulti(slave_dev, -1);
2064
2065 /* flush master's mc_list from slave */
2066 netif_addr_lock_bh(bond_dev);
2067 bond_mc_list_flush(bond_dev, slave_dev);
2068 netif_addr_unlock_bh(bond_dev);
2069 }
2070
2071 netdev_set_master(slave_dev, NULL);
2072
2073 /* close slave before restoring its mac address */
2074 dev_close(slave_dev);
2075
2076 if (!bond->params.fail_over_mac) {
2077 /* restore original ("permanent") mac address*/
2078 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2079 addr.sa_family = slave_dev->type;
2080 dev_set_mac_address(slave_dev, &addr);
2081 }
2082
2083 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2084 IFF_SLAVE_INACTIVE);
2085
2086 kfree(slave);
2087
2088 /* re-acquire the lock before getting the next slave */
2089 write_lock_bh(&bond->lock);
2090 }
2091
2092 /* zero the mac address of the master so it will be
2093 * set by the application to the mac address of the
2094 * first slave
2095 */
2096 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2097
2098 if (list_empty(&bond->vlan_list))
2099 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2100 else {
2101 pr_warning(DRV_NAME
2102 ": %s: Warning: clearing HW address of %s while it "
2103 "still has VLANs.\n",
2104 bond_dev->name, bond_dev->name);
2105 pr_warning(DRV_NAME
2106 ": %s: When re-adding slaves, make sure the bond's "
2107 "HW address matches its VLANs'.\n",
2108 bond_dev->name);
2109 }
2110
2111 pr_info(DRV_NAME
2112 ": %s: released all slaves\n",
2113 bond_dev->name);
2114
2115 out:
2116 write_unlock_bh(&bond->lock);
2117
2118 return 0;
2119 }
2120
2121 /*
2122 * This function changes the active slave to slave <slave_dev>.
2123 * It returns -EINVAL in the following cases.
2124 * - <slave_dev> is not found in the list.
2125 * - There is not active slave now.
2126 * - <slave_dev> is already active.
2127 * - The link state of <slave_dev> is not BOND_LINK_UP.
2128 * - <slave_dev> is not running.
2129 * In these cases, this function does nothing.
2130 * In the other cases, current_slave pointer is changed and 0 is returned.
2131 */
2132 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2133 {
2134 struct bonding *bond = netdev_priv(bond_dev);
2135 struct slave *old_active = NULL;
2136 struct slave *new_active = NULL;
2137 int res = 0;
2138
2139 if (!USES_PRIMARY(bond->params.mode))
2140 return -EINVAL;
2141
2142 /* Verify that master_dev is indeed the master of slave_dev */
2143 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2144 return -EINVAL;
2145
2146 read_lock(&bond->lock);
2147
2148 read_lock(&bond->curr_slave_lock);
2149 old_active = bond->curr_active_slave;
2150 read_unlock(&bond->curr_slave_lock);
2151
2152 new_active = bond_get_slave_by_dev(bond, slave_dev);
2153
2154 /*
2155 * Changing to the current active: do nothing; return success.
2156 */
2157 if (new_active && (new_active == old_active)) {
2158 read_unlock(&bond->lock);
2159 return 0;
2160 }
2161
2162 if ((new_active) &&
2163 (old_active) &&
2164 (new_active->link == BOND_LINK_UP) &&
2165 IS_UP(new_active->dev)) {
2166 write_lock_bh(&bond->curr_slave_lock);
2167 bond_change_active_slave(bond, new_active);
2168 write_unlock_bh(&bond->curr_slave_lock);
2169 } else
2170 res = -EINVAL;
2171
2172 read_unlock(&bond->lock);
2173
2174 return res;
2175 }
2176
2177 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2178 {
2179 struct bonding *bond = netdev_priv(bond_dev);
2180
2181 info->bond_mode = bond->params.mode;
2182 info->miimon = bond->params.miimon;
2183
2184 read_lock(&bond->lock);
2185 info->num_slaves = bond->slave_cnt;
2186 read_unlock(&bond->lock);
2187
2188 return 0;
2189 }
2190
2191 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2192 {
2193 struct bonding *bond = netdev_priv(bond_dev);
2194 struct slave *slave;
2195 int i, res = -ENODEV;
2196
2197 read_lock(&bond->lock);
2198
2199 bond_for_each_slave(bond, slave, i) {
2200 if (i == (int)info->slave_id) {
2201 res = 0;
2202 strcpy(info->slave_name, slave->dev->name);
2203 info->link = slave->link;
2204 info->state = slave->state;
2205 info->link_failure_count = slave->link_failure_count;
2206 break;
2207 }
2208 }
2209
2210 read_unlock(&bond->lock);
2211
2212 return res;
2213 }
2214
2215 /*-------------------------------- Monitoring -------------------------------*/
2216
2217
2218 static int bond_miimon_inspect(struct bonding *bond)
2219 {
2220 struct slave *slave;
2221 int i, link_state, commit = 0;
2222 bool ignore_updelay;
2223
2224 ignore_updelay = !bond->curr_active_slave ? true : false;
2225
2226 bond_for_each_slave(bond, slave, i) {
2227 slave->new_link = BOND_LINK_NOCHANGE;
2228
2229 link_state = bond_check_dev_link(bond, slave->dev, 0);
2230
2231 switch (slave->link) {
2232 case BOND_LINK_UP:
2233 if (link_state)
2234 continue;
2235
2236 slave->link = BOND_LINK_FAIL;
2237 slave->delay = bond->params.downdelay;
2238 if (slave->delay) {
2239 pr_info(DRV_NAME
2240 ": %s: link status down for %s"
2241 "interface %s, disabling it in %d ms.\n",
2242 bond->dev->name,
2243 (bond->params.mode ==
2244 BOND_MODE_ACTIVEBACKUP) ?
2245 ((slave->state == BOND_STATE_ACTIVE) ?
2246 "active " : "backup ") : "",
2247 slave->dev->name,
2248 bond->params.downdelay * bond->params.miimon);
2249 }
2250 /*FALLTHRU*/
2251 case BOND_LINK_FAIL:
2252 if (link_state) {
2253 /*
2254 * recovered before downdelay expired
2255 */
2256 slave->link = BOND_LINK_UP;
2257 slave->jiffies = jiffies;
2258 pr_info(DRV_NAME
2259 ": %s: link status up again after %d "
2260 "ms for interface %s.\n",
2261 bond->dev->name,
2262 (bond->params.downdelay - slave->delay) *
2263 bond->params.miimon,
2264 slave->dev->name);
2265 continue;
2266 }
2267
2268 if (slave->delay <= 0) {
2269 slave->new_link = BOND_LINK_DOWN;
2270 commit++;
2271 continue;
2272 }
2273
2274 slave->delay--;
2275 break;
2276
2277 case BOND_LINK_DOWN:
2278 if (!link_state)
2279 continue;
2280
2281 slave->link = BOND_LINK_BACK;
2282 slave->delay = bond->params.updelay;
2283
2284 if (slave->delay) {
2285 pr_info(DRV_NAME
2286 ": %s: link status up for "
2287 "interface %s, enabling it in %d ms.\n",
2288 bond->dev->name, slave->dev->name,
2289 ignore_updelay ? 0 :
2290 bond->params.updelay *
2291 bond->params.miimon);
2292 }
2293 /*FALLTHRU*/
2294 case BOND_LINK_BACK:
2295 if (!link_state) {
2296 slave->link = BOND_LINK_DOWN;
2297 pr_info(DRV_NAME
2298 ": %s: link status down again after %d "
2299 "ms for interface %s.\n",
2300 bond->dev->name,
2301 (bond->params.updelay - slave->delay) *
2302 bond->params.miimon,
2303 slave->dev->name);
2304
2305 continue;
2306 }
2307
2308 if (ignore_updelay)
2309 slave->delay = 0;
2310
2311 if (slave->delay <= 0) {
2312 slave->new_link = BOND_LINK_UP;
2313 commit++;
2314 ignore_updelay = false;
2315 continue;
2316 }
2317
2318 slave->delay--;
2319 break;
2320 }
2321 }
2322
2323 return commit;
2324 }
2325
2326 static void bond_miimon_commit(struct bonding *bond)
2327 {
2328 struct slave *slave;
2329 int i;
2330
2331 bond_for_each_slave(bond, slave, i) {
2332 switch (slave->new_link) {
2333 case BOND_LINK_NOCHANGE:
2334 continue;
2335
2336 case BOND_LINK_UP:
2337 slave->link = BOND_LINK_UP;
2338 slave->jiffies = jiffies;
2339
2340 if (bond->params.mode == BOND_MODE_8023AD) {
2341 /* prevent it from being the active one */
2342 slave->state = BOND_STATE_BACKUP;
2343 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2344 /* make it immediately active */
2345 slave->state = BOND_STATE_ACTIVE;
2346 } else if (slave != bond->primary_slave) {
2347 /* prevent it from being the active one */
2348 slave->state = BOND_STATE_BACKUP;
2349 }
2350
2351 pr_info(DRV_NAME
2352 ": %s: link status definitely "
2353 "up for interface %s.\n",
2354 bond->dev->name, slave->dev->name);
2355
2356 /* notify ad that the link status has changed */
2357 if (bond->params.mode == BOND_MODE_8023AD)
2358 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2359
2360 if (bond_is_lb(bond))
2361 bond_alb_handle_link_change(bond, slave,
2362 BOND_LINK_UP);
2363
2364 if (!bond->curr_active_slave ||
2365 (slave == bond->primary_slave))
2366 goto do_failover;
2367
2368 continue;
2369
2370 case BOND_LINK_DOWN:
2371 if (slave->link_failure_count < UINT_MAX)
2372 slave->link_failure_count++;
2373
2374 slave->link = BOND_LINK_DOWN;
2375
2376 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2377 bond->params.mode == BOND_MODE_8023AD)
2378 bond_set_slave_inactive_flags(slave);
2379
2380 pr_info(DRV_NAME
2381 ": %s: link status definitely down for "
2382 "interface %s, disabling it\n",
2383 bond->dev->name, slave->dev->name);
2384
2385 if (bond->params.mode == BOND_MODE_8023AD)
2386 bond_3ad_handle_link_change(slave,
2387 BOND_LINK_DOWN);
2388
2389 if (bond_is_lb(bond))
2390 bond_alb_handle_link_change(bond, slave,
2391 BOND_LINK_DOWN);
2392
2393 if (slave == bond->curr_active_slave)
2394 goto do_failover;
2395
2396 continue;
2397
2398 default:
2399 pr_err(DRV_NAME
2400 ": %s: invalid new link %d on slave %s\n",
2401 bond->dev->name, slave->new_link,
2402 slave->dev->name);
2403 slave->new_link = BOND_LINK_NOCHANGE;
2404
2405 continue;
2406 }
2407
2408 do_failover:
2409 ASSERT_RTNL();
2410 write_lock_bh(&bond->curr_slave_lock);
2411 bond_select_active_slave(bond);
2412 write_unlock_bh(&bond->curr_slave_lock);
2413 }
2414
2415 bond_set_carrier(bond);
2416 }
2417
2418 /*
2419 * bond_mii_monitor
2420 *
2421 * Really a wrapper that splits the mii monitor into two phases: an
2422 * inspection, then (if inspection indicates something needs to be done)
2423 * an acquisition of appropriate locks followed by a commit phase to
2424 * implement whatever link state changes are indicated.
2425 */
2426 void bond_mii_monitor(struct work_struct *work)
2427 {
2428 struct bonding *bond = container_of(work, struct bonding,
2429 mii_work.work);
2430
2431 read_lock(&bond->lock);
2432 if (bond->kill_timers)
2433 goto out;
2434
2435 if (bond->slave_cnt == 0)
2436 goto re_arm;
2437
2438 if (bond->send_grat_arp) {
2439 read_lock(&bond->curr_slave_lock);
2440 bond_send_gratuitous_arp(bond);
2441 read_unlock(&bond->curr_slave_lock);
2442 }
2443
2444 if (bond->send_unsol_na) {
2445 read_lock(&bond->curr_slave_lock);
2446 bond_send_unsolicited_na(bond);
2447 read_unlock(&bond->curr_slave_lock);
2448 }
2449
2450 if (bond_miimon_inspect(bond)) {
2451 read_unlock(&bond->lock);
2452 rtnl_lock();
2453 read_lock(&bond->lock);
2454
2455 bond_miimon_commit(bond);
2456
2457 read_unlock(&bond->lock);
2458 rtnl_unlock(); /* might sleep, hold no other locks */
2459 read_lock(&bond->lock);
2460 }
2461
2462 re_arm:
2463 if (bond->params.miimon)
2464 queue_delayed_work(bond->wq, &bond->mii_work,
2465 msecs_to_jiffies(bond->params.miimon));
2466 out:
2467 read_unlock(&bond->lock);
2468 }
2469
2470 static __be32 bond_glean_dev_ip(struct net_device *dev)
2471 {
2472 struct in_device *idev;
2473 struct in_ifaddr *ifa;
2474 __be32 addr = 0;
2475
2476 if (!dev)
2477 return 0;
2478
2479 rcu_read_lock();
2480 idev = __in_dev_get_rcu(dev);
2481 if (!idev)
2482 goto out;
2483
2484 ifa = idev->ifa_list;
2485 if (!ifa)
2486 goto out;
2487
2488 addr = ifa->ifa_local;
2489 out:
2490 rcu_read_unlock();
2491 return addr;
2492 }
2493
2494 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2495 {
2496 struct vlan_entry *vlan;
2497
2498 if (ip == bond->master_ip)
2499 return 1;
2500
2501 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2502 if (ip == vlan->vlan_ip)
2503 return 1;
2504 }
2505
2506 return 0;
2507 }
2508
2509 /*
2510 * We go to the (large) trouble of VLAN tagging ARP frames because
2511 * switches in VLAN mode (especially if ports are configured as
2512 * "native" to a VLAN) might not pass non-tagged frames.
2513 */
2514 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2515 {
2516 struct sk_buff *skb;
2517
2518 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2519 slave_dev->name, dest_ip, src_ip, vlan_id);
2520
2521 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2522 NULL, slave_dev->dev_addr, NULL);
2523
2524 if (!skb) {
2525 pr_err(DRV_NAME ": ARP packet allocation failed\n");
2526 return;
2527 }
2528 if (vlan_id) {
2529 skb = vlan_put_tag(skb, vlan_id);
2530 if (!skb) {
2531 pr_err(DRV_NAME ": failed to insert VLAN tag\n");
2532 return;
2533 }
2534 }
2535 arp_xmit(skb);
2536 }
2537
2538
2539 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2540 {
2541 int i, vlan_id, rv;
2542 __be32 *targets = bond->params.arp_targets;
2543 struct vlan_entry *vlan;
2544 struct net_device *vlan_dev;
2545 struct flowi fl;
2546 struct rtable *rt;
2547
2548 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2549 if (!targets[i])
2550 break;
2551 pr_debug("basa: target %x\n", targets[i]);
2552 if (list_empty(&bond->vlan_list)) {
2553 pr_debug("basa: empty vlan: arp_send\n");
2554 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2555 bond->master_ip, 0);
2556 continue;
2557 }
2558
2559 /*
2560 * If VLANs are configured, we do a route lookup to
2561 * determine which VLAN interface would be used, so we
2562 * can tag the ARP with the proper VLAN tag.
2563 */
2564 memset(&fl, 0, sizeof(fl));
2565 fl.fl4_dst = targets[i];
2566 fl.fl4_tos = RTO_ONLINK;
2567
2568 rv = ip_route_output_key(&init_net, &rt, &fl);
2569 if (rv) {
2570 if (net_ratelimit()) {
2571 pr_warning(DRV_NAME
2572 ": %s: no route to arp_ip_target %pI4\n",
2573 bond->dev->name, &fl.fl4_dst);
2574 }
2575 continue;
2576 }
2577
2578 /*
2579 * This target is not on a VLAN
2580 */
2581 if (rt->u.dst.dev == bond->dev) {
2582 ip_rt_put(rt);
2583 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2584 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2585 bond->master_ip, 0);
2586 continue;
2587 }
2588
2589 vlan_id = 0;
2590 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2591 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2592 if (vlan_dev == rt->u.dst.dev) {
2593 vlan_id = vlan->vlan_id;
2594 pr_debug("basa: vlan match on %s %d\n",
2595 vlan_dev->name, vlan_id);
2596 break;
2597 }
2598 }
2599
2600 if (vlan_id) {
2601 ip_rt_put(rt);
2602 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2603 vlan->vlan_ip, vlan_id);
2604 continue;
2605 }
2606
2607 if (net_ratelimit()) {
2608 pr_warning(DRV_NAME
2609 ": %s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2610 bond->dev->name, &fl.fl4_dst,
2611 rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2612 }
2613 ip_rt_put(rt);
2614 }
2615 }
2616
2617 /*
2618 * Kick out a gratuitous ARP for an IP on the bonding master plus one
2619 * for each VLAN above us.
2620 *
2621 * Caller must hold curr_slave_lock for read or better
2622 */
2623 static void bond_send_gratuitous_arp(struct bonding *bond)
2624 {
2625 struct slave *slave = bond->curr_active_slave;
2626 struct vlan_entry *vlan;
2627 struct net_device *vlan_dev;
2628
2629 pr_debug("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2630 slave ? slave->dev->name : "NULL");
2631
2632 if (!slave || !bond->send_grat_arp ||
2633 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2634 return;
2635
2636 bond->send_grat_arp--;
2637
2638 if (bond->master_ip) {
2639 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2640 bond->master_ip, 0);
2641 }
2642
2643 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2644 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2645 if (vlan->vlan_ip) {
2646 bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2647 vlan->vlan_ip, vlan->vlan_id);
2648 }
2649 }
2650 }
2651
2652 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2653 {
2654 int i;
2655 __be32 *targets = bond->params.arp_targets;
2656
2657 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2658 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2659 &sip, &tip, i, &targets[i], bond_has_this_ip(bond, tip));
2660 if (sip == targets[i]) {
2661 if (bond_has_this_ip(bond, tip))
2662 slave->last_arp_rx = jiffies;
2663 return;
2664 }
2665 }
2666 }
2667
2668 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2669 {
2670 struct arphdr *arp;
2671 struct slave *slave;
2672 struct bonding *bond;
2673 unsigned char *arp_ptr;
2674 __be32 sip, tip;
2675
2676 if (dev_net(dev) != &init_net)
2677 goto out;
2678
2679 if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2680 goto out;
2681
2682 bond = netdev_priv(dev);
2683 read_lock(&bond->lock);
2684
2685 pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2686 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2687 orig_dev ? orig_dev->name : "NULL");
2688
2689 slave = bond_get_slave_by_dev(bond, orig_dev);
2690 if (!slave || !slave_do_arp_validate(bond, slave))
2691 goto out_unlock;
2692
2693 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2694 goto out_unlock;
2695
2696 arp = arp_hdr(skb);
2697 if (arp->ar_hln != dev->addr_len ||
2698 skb->pkt_type == PACKET_OTHERHOST ||
2699 skb->pkt_type == PACKET_LOOPBACK ||
2700 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2701 arp->ar_pro != htons(ETH_P_IP) ||
2702 arp->ar_pln != 4)
2703 goto out_unlock;
2704
2705 arp_ptr = (unsigned char *)(arp + 1);
2706 arp_ptr += dev->addr_len;
2707 memcpy(&sip, arp_ptr, 4);
2708 arp_ptr += 4 + dev->addr_len;
2709 memcpy(&tip, arp_ptr, 4);
2710
2711 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2712 bond->dev->name, slave->dev->name, slave->state,
2713 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2714 &sip, &tip);
2715
2716 /*
2717 * Backup slaves won't see the ARP reply, but do come through
2718 * here for each ARP probe (so we swap the sip/tip to validate
2719 * the probe). In a "redundant switch, common router" type of
2720 * configuration, the ARP probe will (hopefully) travel from
2721 * the active, through one switch, the router, then the other
2722 * switch before reaching the backup.
2723 */
2724 if (slave->state == BOND_STATE_ACTIVE)
2725 bond_validate_arp(bond, slave, sip, tip);
2726 else
2727 bond_validate_arp(bond, slave, tip, sip);
2728
2729 out_unlock:
2730 read_unlock(&bond->lock);
2731 out:
2732 dev_kfree_skb(skb);
2733 return NET_RX_SUCCESS;
2734 }
2735
2736 /*
2737 * this function is called regularly to monitor each slave's link
2738 * ensuring that traffic is being sent and received when arp monitoring
2739 * is used in load-balancing mode. if the adapter has been dormant, then an
2740 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2741 * arp monitoring in active backup mode.
2742 */
2743 void bond_loadbalance_arp_mon(struct work_struct *work)
2744 {
2745 struct bonding *bond = container_of(work, struct bonding,
2746 arp_work.work);
2747 struct slave *slave, *oldcurrent;
2748 int do_failover = 0;
2749 int delta_in_ticks;
2750 int i;
2751
2752 read_lock(&bond->lock);
2753
2754 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2755
2756 if (bond->kill_timers)
2757 goto out;
2758
2759 if (bond->slave_cnt == 0)
2760 goto re_arm;
2761
2762 read_lock(&bond->curr_slave_lock);
2763 oldcurrent = bond->curr_active_slave;
2764 read_unlock(&bond->curr_slave_lock);
2765
2766 /* see if any of the previous devices are up now (i.e. they have
2767 * xmt and rcv traffic). the curr_active_slave does not come into
2768 * the picture unless it is null. also, slave->jiffies is not needed
2769 * here because we send an arp on each slave and give a slave as
2770 * long as it needs to get the tx/rx within the delta.
2771 * TODO: what about up/down delay in arp mode? it wasn't here before
2772 * so it can wait
2773 */
2774 bond_for_each_slave(bond, slave, i) {
2775 if (slave->link != BOND_LINK_UP) {
2776 if (time_before_eq(jiffies, dev_trans_start(slave->dev) + delta_in_ticks) &&
2777 time_before_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
2778
2779 slave->link = BOND_LINK_UP;
2780 slave->state = BOND_STATE_ACTIVE;
2781
2782 /* primary_slave has no meaning in round-robin
2783 * mode. the window of a slave being up and
2784 * curr_active_slave being null after enslaving
2785 * is closed.
2786 */
2787 if (!oldcurrent) {
2788 pr_info(DRV_NAME
2789 ": %s: link status definitely "
2790 "up for interface %s, ",
2791 bond->dev->name,
2792 slave->dev->name);
2793 do_failover = 1;
2794 } else {
2795 pr_info(DRV_NAME
2796 ": %s: interface %s is now up\n",
2797 bond->dev->name,
2798 slave->dev->name);
2799 }
2800 }
2801 } else {
2802 /* slave->link == BOND_LINK_UP */
2803
2804 /* not all switches will respond to an arp request
2805 * when the source ip is 0, so don't take the link down
2806 * if we don't know our ip yet
2807 */
2808 if (time_after_eq(jiffies, dev_trans_start(slave->dev) + 2*delta_in_ticks) ||
2809 (time_after_eq(jiffies, slave->dev->last_rx + 2*delta_in_ticks))) {
2810
2811 slave->link = BOND_LINK_DOWN;
2812 slave->state = BOND_STATE_BACKUP;
2813
2814 if (slave->link_failure_count < UINT_MAX)
2815 slave->link_failure_count++;
2816
2817 pr_info(DRV_NAME
2818 ": %s: interface %s is now down.\n",
2819 bond->dev->name,
2820 slave->dev->name);
2821
2822 if (slave == oldcurrent)
2823 do_failover = 1;
2824 }
2825 }
2826
2827 /* note: if switch is in round-robin mode, all links
2828 * must tx arp to ensure all links rx an arp - otherwise
2829 * links may oscillate or not come up at all; if switch is
2830 * in something like xor mode, there is nothing we can
2831 * do - all replies will be rx'ed on same link causing slaves
2832 * to be unstable during low/no traffic periods
2833 */
2834 if (IS_UP(slave->dev))
2835 bond_arp_send_all(bond, slave);
2836 }
2837
2838 if (do_failover) {
2839 write_lock_bh(&bond->curr_slave_lock);
2840
2841 bond_select_active_slave(bond);
2842
2843 write_unlock_bh(&bond->curr_slave_lock);
2844 }
2845
2846 re_arm:
2847 if (bond->params.arp_interval)
2848 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2849 out:
2850 read_unlock(&bond->lock);
2851 }
2852
2853 /*
2854 * Called to inspect slaves for active-backup mode ARP monitor link state
2855 * changes. Sets new_link in slaves to specify what action should take
2856 * place for the slave. Returns 0 if no changes are found, >0 if changes
2857 * to link states must be committed.
2858 *
2859 * Called with bond->lock held for read.
2860 */
2861 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2862 {
2863 struct slave *slave;
2864 int i, commit = 0;
2865
2866 bond_for_each_slave(bond, slave, i) {
2867 slave->new_link = BOND_LINK_NOCHANGE;
2868
2869 if (slave->link != BOND_LINK_UP) {
2870 if (time_before_eq(jiffies, slave_last_rx(bond, slave) +
2871 delta_in_ticks)) {
2872 slave->new_link = BOND_LINK_UP;
2873 commit++;
2874 }
2875
2876 continue;
2877 }
2878
2879 /*
2880 * Give slaves 2*delta after being enslaved or made
2881 * active. This avoids bouncing, as the last receive
2882 * times need a full ARP monitor cycle to be updated.
2883 */
2884 if (!time_after_eq(jiffies, slave->jiffies +
2885 2 * delta_in_ticks))
2886 continue;
2887
2888 /*
2889 * Backup slave is down if:
2890 * - No current_arp_slave AND
2891 * - more than 3*delta since last receive AND
2892 * - the bond has an IP address
2893 *
2894 * Note: a non-null current_arp_slave indicates
2895 * the curr_active_slave went down and we are
2896 * searching for a new one; under this condition
2897 * we only take the curr_active_slave down - this
2898 * gives each slave a chance to tx/rx traffic
2899 * before being taken out
2900 */
2901 if (slave->state == BOND_STATE_BACKUP &&
2902 !bond->current_arp_slave &&
2903 time_after(jiffies, slave_last_rx(bond, slave) +
2904 3 * delta_in_ticks)) {
2905 slave->new_link = BOND_LINK_DOWN;
2906 commit++;
2907 }
2908
2909 /*
2910 * Active slave is down if:
2911 * - more than 2*delta since transmitting OR
2912 * - (more than 2*delta since receive AND
2913 * the bond has an IP address)
2914 */
2915 if ((slave->state == BOND_STATE_ACTIVE) &&
2916 (time_after_eq(jiffies, dev_trans_start(slave->dev) +
2917 2 * delta_in_ticks) ||
2918 (time_after_eq(jiffies, slave_last_rx(bond, slave)
2919 + 2 * delta_in_ticks)))) {
2920 slave->new_link = BOND_LINK_DOWN;
2921 commit++;
2922 }
2923 }
2924
2925 read_lock(&bond->curr_slave_lock);
2926
2927 /*
2928 * Trigger a commit if the primary option setting has changed.
2929 */
2930 if (bond->primary_slave &&
2931 (bond->primary_slave != bond->curr_active_slave) &&
2932 (bond->primary_slave->link == BOND_LINK_UP))
2933 commit++;
2934
2935 read_unlock(&bond->curr_slave_lock);
2936
2937 return commit;
2938 }
2939
2940 /*
2941 * Called to commit link state changes noted by inspection step of
2942 * active-backup mode ARP monitor.
2943 *
2944 * Called with RTNL and bond->lock for read.
2945 */
2946 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2947 {
2948 struct slave *slave;
2949 int i;
2950
2951 bond_for_each_slave(bond, slave, i) {
2952 switch (slave->new_link) {
2953 case BOND_LINK_NOCHANGE:
2954 continue;
2955
2956 case BOND_LINK_UP:
2957 write_lock_bh(&bond->curr_slave_lock);
2958
2959 if (!bond->curr_active_slave &&
2960 time_before_eq(jiffies, dev_trans_start(slave->dev) +
2961 delta_in_ticks)) {
2962 slave->link = BOND_LINK_UP;
2963 bond_change_active_slave(bond, slave);
2964 bond->current_arp_slave = NULL;
2965
2966 pr_info(DRV_NAME
2967 ": %s: %s is up and now the "
2968 "active interface\n",
2969 bond->dev->name, slave->dev->name);
2970
2971 } else if (bond->curr_active_slave != slave) {
2972 /* this slave has just come up but we
2973 * already have a current slave; this can
2974 * also happen if bond_enslave adds a new
2975 * slave that is up while we are searching
2976 * for a new slave
2977 */
2978 slave->link = BOND_LINK_UP;
2979 bond_set_slave_inactive_flags(slave);
2980 bond->current_arp_slave = NULL;
2981
2982 pr_info(DRV_NAME
2983 ": %s: backup interface %s is now up\n",
2984 bond->dev->name, slave->dev->name);
2985 }
2986
2987 write_unlock_bh(&bond->curr_slave_lock);
2988
2989 break;
2990
2991 case BOND_LINK_DOWN:
2992 if (slave->link_failure_count < UINT_MAX)
2993 slave->link_failure_count++;
2994
2995 slave->link = BOND_LINK_DOWN;
2996
2997 if (slave == bond->curr_active_slave) {
2998 pr_info(DRV_NAME
2999 ": %s: link status down for active "
3000 "interface %s, disabling it\n",
3001 bond->dev->name, slave->dev->name);
3002
3003 bond_set_slave_inactive_flags(slave);
3004
3005 write_lock_bh(&bond->curr_slave_lock);
3006
3007 bond_select_active_slave(bond);
3008 if (bond->curr_active_slave)
3009 bond->curr_active_slave->jiffies =
3010 jiffies;
3011
3012 write_unlock_bh(&bond->curr_slave_lock);
3013
3014 bond->current_arp_slave = NULL;
3015
3016 } else if (slave->state == BOND_STATE_BACKUP) {
3017 pr_info(DRV_NAME
3018 ": %s: backup interface %s is now down\n",
3019 bond->dev->name, slave->dev->name);
3020
3021 bond_set_slave_inactive_flags(slave);
3022 }
3023 break;
3024
3025 default:
3026 pr_err(DRV_NAME
3027 ": %s: impossible: new_link %d on slave %s\n",
3028 bond->dev->name, slave->new_link,
3029 slave->dev->name);
3030 }
3031 }
3032
3033 /*
3034 * No race with changes to primary via sysfs, as we hold rtnl.
3035 */
3036 if (bond->primary_slave &&
3037 (bond->primary_slave != bond->curr_active_slave) &&
3038 (bond->primary_slave->link == BOND_LINK_UP)) {
3039 write_lock_bh(&bond->curr_slave_lock);
3040 bond_change_active_slave(bond, bond->primary_slave);
3041 write_unlock_bh(&bond->curr_slave_lock);
3042 }
3043
3044 bond_set_carrier(bond);
3045 }
3046
3047 /*
3048 * Send ARP probes for active-backup mode ARP monitor.
3049 *
3050 * Called with bond->lock held for read.
3051 */
3052 static void bond_ab_arp_probe(struct bonding *bond)
3053 {
3054 struct slave *slave;
3055 int i;
3056
3057 read_lock(&bond->curr_slave_lock);
3058
3059 if (bond->current_arp_slave && bond->curr_active_slave)
3060 pr_info(DRV_NAME "PROBE: c_arp %s && cas %s BAD\n",
3061 bond->current_arp_slave->dev->name,
3062 bond->curr_active_slave->dev->name);
3063
3064 if (bond->curr_active_slave) {
3065 bond_arp_send_all(bond, bond->curr_active_slave);
3066 read_unlock(&bond->curr_slave_lock);
3067 return;
3068 }
3069
3070 read_unlock(&bond->curr_slave_lock);
3071
3072 /* if we don't have a curr_active_slave, search for the next available
3073 * backup slave from the current_arp_slave and make it the candidate
3074 * for becoming the curr_active_slave
3075 */
3076
3077 if (!bond->current_arp_slave) {
3078 bond->current_arp_slave = bond->first_slave;
3079 if (!bond->current_arp_slave)
3080 return;
3081 }
3082
3083 bond_set_slave_inactive_flags(bond->current_arp_slave);
3084
3085 /* search for next candidate */
3086 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3087 if (IS_UP(slave->dev)) {
3088 slave->link = BOND_LINK_BACK;
3089 bond_set_slave_active_flags(slave);
3090 bond_arp_send_all(bond, slave);
3091 slave->jiffies = jiffies;
3092 bond->current_arp_slave = slave;
3093 break;
3094 }
3095
3096 /* if the link state is up at this point, we
3097 * mark it down - this can happen if we have
3098 * simultaneous link failures and
3099 * reselect_active_interface doesn't make this
3100 * one the current slave so it is still marked
3101 * up when it is actually down
3102 */
3103 if (slave->link == BOND_LINK_UP) {
3104 slave->link = BOND_LINK_DOWN;
3105 if (slave->link_failure_count < UINT_MAX)
3106 slave->link_failure_count++;
3107
3108 bond_set_slave_inactive_flags(slave);
3109
3110 pr_info(DRV_NAME
3111 ": %s: backup interface %s is now down.\n",
3112 bond->dev->name, slave->dev->name);
3113 }
3114 }
3115 }
3116
3117 void bond_activebackup_arp_mon(struct work_struct *work)
3118 {
3119 struct bonding *bond = container_of(work, struct bonding,
3120 arp_work.work);
3121 int delta_in_ticks;
3122
3123 read_lock(&bond->lock);
3124
3125 if (bond->kill_timers)
3126 goto out;
3127
3128 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3129
3130 if (bond->slave_cnt == 0)
3131 goto re_arm;
3132
3133 if (bond->send_grat_arp) {
3134 read_lock(&bond->curr_slave_lock);
3135 bond_send_gratuitous_arp(bond);
3136 read_unlock(&bond->curr_slave_lock);
3137 }
3138
3139 if (bond->send_unsol_na) {
3140 read_lock(&bond->curr_slave_lock);
3141 bond_send_unsolicited_na(bond);
3142 read_unlock(&bond->curr_slave_lock);
3143 }
3144
3145 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3146 read_unlock(&bond->lock);
3147 rtnl_lock();
3148 read_lock(&bond->lock);
3149
3150 bond_ab_arp_commit(bond, delta_in_ticks);
3151
3152 read_unlock(&bond->lock);
3153 rtnl_unlock();
3154 read_lock(&bond->lock);
3155 }
3156
3157 bond_ab_arp_probe(bond);
3158
3159 re_arm:
3160 if (bond->params.arp_interval)
3161 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3162 out:
3163 read_unlock(&bond->lock);
3164 }
3165
3166 /*------------------------------ proc/seq_file-------------------------------*/
3167
3168 #ifdef CONFIG_PROC_FS
3169
3170 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3171 __acquires(&dev_base_lock)
3172 __acquires(&bond->lock)
3173 {
3174 struct bonding *bond = seq->private;
3175 loff_t off = 0;
3176 struct slave *slave;
3177 int i;
3178
3179 /* make sure the bond won't be taken away */
3180 read_lock(&dev_base_lock);
3181 read_lock(&bond->lock);
3182
3183 if (*pos == 0)
3184 return SEQ_START_TOKEN;
3185
3186 bond_for_each_slave(bond, slave, i) {
3187 if (++off == *pos)
3188 return slave;
3189 }
3190
3191 return NULL;
3192 }
3193
3194 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3195 {
3196 struct bonding *bond = seq->private;
3197 struct slave *slave = v;
3198
3199 ++*pos;
3200 if (v == SEQ_START_TOKEN)
3201 return bond->first_slave;
3202
3203 slave = slave->next;
3204
3205 return (slave == bond->first_slave) ? NULL : slave;
3206 }
3207
3208 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3209 __releases(&bond->lock)
3210 __releases(&dev_base_lock)
3211 {
3212 struct bonding *bond = seq->private;
3213
3214 read_unlock(&bond->lock);
3215 read_unlock(&dev_base_lock);
3216 }
3217
3218 static void bond_info_show_master(struct seq_file *seq)
3219 {
3220 struct bonding *bond = seq->private;
3221 struct slave *curr;
3222 int i;
3223
3224 read_lock(&bond->curr_slave_lock);
3225 curr = bond->curr_active_slave;
3226 read_unlock(&bond->curr_slave_lock);
3227
3228 seq_printf(seq, "Bonding Mode: %s",
3229 bond_mode_name(bond->params.mode));
3230
3231 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3232 bond->params.fail_over_mac)
3233 seq_printf(seq, " (fail_over_mac %s)",
3234 fail_over_mac_tbl[bond->params.fail_over_mac].modename);
3235
3236 seq_printf(seq, "\n");
3237
3238 if (bond->params.mode == BOND_MODE_XOR ||
3239 bond->params.mode == BOND_MODE_8023AD) {
3240 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3241 xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3242 bond->params.xmit_policy);
3243 }
3244
3245 if (USES_PRIMARY(bond->params.mode)) {
3246 seq_printf(seq, "Primary Slave: %s\n",
3247 (bond->primary_slave) ?
3248 bond->primary_slave->dev->name : "None");
3249
3250 seq_printf(seq, "Currently Active Slave: %s\n",
3251 (curr) ? curr->dev->name : "None");
3252 }
3253
3254 seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3255 "up" : "down");
3256 seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3257 seq_printf(seq, "Up Delay (ms): %d\n",
3258 bond->params.updelay * bond->params.miimon);
3259 seq_printf(seq, "Down Delay (ms): %d\n",
3260 bond->params.downdelay * bond->params.miimon);
3261
3262
3263 /* ARP information */
3264 if (bond->params.arp_interval > 0) {
3265 int printed = 0;
3266 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3267 bond->params.arp_interval);
3268
3269 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3270
3271 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
3272 if (!bond->params.arp_targets[i])
3273 break;
3274 if (printed)
3275 seq_printf(seq, ",");
3276 seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
3277 printed = 1;
3278 }
3279 seq_printf(seq, "\n");
3280 }
3281
3282 if (bond->params.mode == BOND_MODE_8023AD) {
3283 struct ad_info ad_info;
3284
3285 seq_puts(seq, "\n802.3ad info\n");
3286 seq_printf(seq, "LACP rate: %s\n",
3287 (bond->params.lacp_fast) ? "fast" : "slow");
3288 seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
3289 ad_select_tbl[bond->params.ad_select].modename);
3290
3291 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3292 seq_printf(seq, "bond %s has no active aggregator\n",
3293 bond->dev->name);
3294 } else {
3295 seq_printf(seq, "Active Aggregator Info:\n");
3296
3297 seq_printf(seq, "\tAggregator ID: %d\n",
3298 ad_info.aggregator_id);
3299 seq_printf(seq, "\tNumber of ports: %d\n",
3300 ad_info.ports);
3301 seq_printf(seq, "\tActor Key: %d\n",
3302 ad_info.actor_key);
3303 seq_printf(seq, "\tPartner Key: %d\n",
3304 ad_info.partner_key);
3305 seq_printf(seq, "\tPartner Mac Address: %pM\n",
3306 ad_info.partner_system);
3307 }
3308 }
3309 }
3310
3311 static void bond_info_show_slave(struct seq_file *seq,
3312 const struct slave *slave)
3313 {
3314 struct bonding *bond = seq->private;
3315
3316 seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3317 seq_printf(seq, "MII Status: %s\n",
3318 (slave->link == BOND_LINK_UP) ? "up" : "down");
3319 seq_printf(seq, "Link Failure Count: %u\n",
3320 slave->link_failure_count);
3321
3322 seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
3323
3324 if (bond->params.mode == BOND_MODE_8023AD) {
3325 const struct aggregator *agg
3326 = SLAVE_AD_INFO(slave).port.aggregator;
3327
3328 if (agg)
3329 seq_printf(seq, "Aggregator ID: %d\n",
3330 agg->aggregator_identifier);
3331 else
3332 seq_puts(seq, "Aggregator ID: N/A\n");
3333 }
3334 }
3335
3336 static int bond_info_seq_show(struct seq_file *seq, void *v)
3337 {
3338 if (v == SEQ_START_TOKEN) {
3339 seq_printf(seq, "%s\n", version);
3340 bond_info_show_master(seq);
3341 } else
3342 bond_info_show_slave(seq, v);
3343
3344 return 0;
3345 }
3346
3347 static const struct seq_operations bond_info_seq_ops = {
3348 .start = bond_info_seq_start,
3349 .next = bond_info_seq_next,
3350 .stop = bond_info_seq_stop,
3351 .show = bond_info_seq_show,
3352 };
3353
3354 static int bond_info_open(struct inode *inode, struct file *file)
3355 {
3356 struct seq_file *seq;
3357 struct proc_dir_entry *proc;
3358 int res;
3359
3360 res = seq_open(file, &bond_info_seq_ops);
3361 if (!res) {
3362 /* recover the pointer buried in proc_dir_entry data */
3363 seq = file->private_data;
3364 proc = PDE(inode);
3365 seq->private = proc->data;
3366 }
3367
3368 return res;
3369 }
3370
3371 static const struct file_operations bond_info_fops = {
3372 .owner = THIS_MODULE,
3373 .open = bond_info_open,
3374 .read = seq_read,
3375 .llseek = seq_lseek,
3376 .release = seq_release,
3377 };
3378
3379 static int bond_create_proc_entry(struct bonding *bond)
3380 {
3381 struct net_device *bond_dev = bond->dev;
3382
3383 if (bond_proc_dir) {
3384 bond->proc_entry = proc_create_data(bond_dev->name,
3385 S_IRUGO, bond_proc_dir,
3386 &bond_info_fops, bond);
3387 if (bond->proc_entry == NULL)
3388 pr_warning(DRV_NAME
3389 ": Warning: Cannot create /proc/net/%s/%s\n",
3390 DRV_NAME, bond_dev->name);
3391 else
3392 memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3393 }
3394
3395 return 0;
3396 }
3397
3398 static void bond_remove_proc_entry(struct bonding *bond)
3399 {
3400 if (bond_proc_dir && bond->proc_entry) {
3401 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3402 memset(bond->proc_file_name, 0, IFNAMSIZ);
3403 bond->proc_entry = NULL;
3404 }
3405 }
3406
3407 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3408 * Caller must hold rtnl_lock.
3409 */
3410 static void bond_create_proc_dir(void)
3411 {
3412 if (!bond_proc_dir) {
3413 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3414 if (!bond_proc_dir)
3415 pr_warning(DRV_NAME
3416 ": Warning: cannot create /proc/net/%s\n",
3417 DRV_NAME);
3418 }
3419 }
3420
3421 /* Destroy the bonding directory under /proc/net, if empty.
3422 * Caller must hold rtnl_lock.
3423 */
3424 static void bond_destroy_proc_dir(void)
3425 {
3426 if (bond_proc_dir) {
3427 remove_proc_entry(DRV_NAME, init_net.proc_net);
3428 bond_proc_dir = NULL;
3429 }
3430 }
3431
3432 #else /* !CONFIG_PROC_FS */
3433
3434 static int bond_create_proc_entry(struct bonding *bond)
3435 {
3436 }
3437
3438 static void bond_remove_proc_entry(struct bonding *bond)
3439 {
3440 }
3441
3442 static void bond_create_proc_dir(void)
3443 {
3444 }
3445
3446 static void bond_destroy_proc_dir(void)
3447 {
3448 }
3449
3450 #endif /* CONFIG_PROC_FS */
3451
3452
3453 /*-------------------------- netdev event handling --------------------------*/
3454
3455 /*
3456 * Change device name
3457 */
3458 static int bond_event_changename(struct bonding *bond)
3459 {
3460 bond_remove_proc_entry(bond);
3461 bond_create_proc_entry(bond);
3462
3463 bond_destroy_sysfs_entry(bond);
3464 bond_create_sysfs_entry(bond);
3465
3466 return NOTIFY_DONE;
3467 }
3468
3469 static int bond_master_netdev_event(unsigned long event,
3470 struct net_device *bond_dev)
3471 {
3472 struct bonding *event_bond = netdev_priv(bond_dev);
3473
3474 switch (event) {
3475 case NETDEV_CHANGENAME:
3476 return bond_event_changename(event_bond);
3477 case NETDEV_UNREGISTER:
3478 bond_release_all(event_bond->dev);
3479 break;
3480 default:
3481 break;
3482 }
3483
3484 return NOTIFY_DONE;
3485 }
3486
3487 static int bond_slave_netdev_event(unsigned long event,
3488 struct net_device *slave_dev)
3489 {
3490 struct net_device *bond_dev = slave_dev->master;
3491 struct bonding *bond = netdev_priv(bond_dev);
3492
3493 switch (event) {
3494 case NETDEV_UNREGISTER:
3495 if (bond_dev) {
3496 if (bond->setup_by_slave)
3497 bond_release_and_destroy(bond_dev, slave_dev);
3498 else
3499 bond_release(bond_dev, slave_dev);
3500 }
3501 break;
3502 case NETDEV_CHANGE:
3503 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3504 struct slave *slave;
3505
3506 slave = bond_get_slave_by_dev(bond, slave_dev);
3507 if (slave) {
3508 u16 old_speed = slave->speed;
3509 u16 old_duplex = slave->duplex;
3510
3511 bond_update_speed_duplex(slave);
3512
3513 if (bond_is_lb(bond))
3514 break;
3515
3516 if (old_speed != slave->speed)
3517 bond_3ad_adapter_speed_changed(slave);
3518 if (old_duplex != slave->duplex)
3519 bond_3ad_adapter_duplex_changed(slave);
3520 }
3521 }
3522
3523 break;
3524 case NETDEV_DOWN:
3525 /*
3526 * ... Or is it this?
3527 */
3528 break;
3529 case NETDEV_CHANGEMTU:
3530 /*
3531 * TODO: Should slaves be allowed to
3532 * independently alter their MTU? For
3533 * an active-backup bond, slaves need
3534 * not be the same type of device, so
3535 * MTUs may vary. For other modes,
3536 * slaves arguably should have the
3537 * same MTUs. To do this, we'd need to
3538 * take over the slave's change_mtu
3539 * function for the duration of their
3540 * servitude.
3541 */
3542 break;
3543 case NETDEV_CHANGENAME:
3544 /*
3545 * TODO: handle changing the primary's name
3546 */
3547 break;
3548 case NETDEV_FEAT_CHANGE:
3549 bond_compute_features(bond);
3550 break;
3551 default:
3552 break;
3553 }
3554
3555 return NOTIFY_DONE;
3556 }
3557
3558 /*
3559 * bond_netdev_event: handle netdev notifier chain events.
3560 *
3561 * This function receives events for the netdev chain. The caller (an
3562 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3563 * locks for us to safely manipulate the slave devices (RTNL lock,
3564 * dev_probe_lock).
3565 */
3566 static int bond_netdev_event(struct notifier_block *this,
3567 unsigned long event, void *ptr)
3568 {
3569 struct net_device *event_dev = (struct net_device *)ptr;
3570
3571 if (dev_net(event_dev) != &init_net)
3572 return NOTIFY_DONE;
3573
3574 pr_debug("event_dev: %s, event: %lx\n",
3575 (event_dev ? event_dev->name : "None"),
3576 event);
3577
3578 if (!(event_dev->priv_flags & IFF_BONDING))
3579 return NOTIFY_DONE;
3580
3581 if (event_dev->flags & IFF_MASTER) {
3582 pr_debug("IFF_MASTER\n");
3583 return bond_master_netdev_event(event, event_dev);
3584 }
3585
3586 if (event_dev->flags & IFF_SLAVE) {
3587 pr_debug("IFF_SLAVE\n");
3588 return bond_slave_netdev_event(event, event_dev);
3589 }
3590
3591 return NOTIFY_DONE;
3592 }
3593
3594 /*
3595 * bond_inetaddr_event: handle inetaddr notifier chain events.
3596 *
3597 * We keep track of device IPs primarily to use as source addresses in
3598 * ARP monitor probes (rather than spewing out broadcasts all the time).
3599 *
3600 * We track one IP for the main device (if it has one), plus one per VLAN.
3601 */
3602 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3603 {
3604 struct in_ifaddr *ifa = ptr;
3605 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3606 struct bonding *bond;
3607 struct vlan_entry *vlan;
3608
3609 if (dev_net(ifa->ifa_dev->dev) != &init_net)
3610 return NOTIFY_DONE;
3611
3612 list_for_each_entry(bond, &bond_dev_list, bond_list) {
3613 if (bond->dev == event_dev) {
3614 switch (event) {
3615 case NETDEV_UP:
3616 bond->master_ip = ifa->ifa_local;
3617 return NOTIFY_OK;
3618 case NETDEV_DOWN:
3619 bond->master_ip = bond_glean_dev_ip(bond->dev);
3620 return NOTIFY_OK;
3621 default:
3622 return NOTIFY_DONE;
3623 }
3624 }
3625
3626 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3627 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3628 if (vlan_dev == event_dev) {
3629 switch (event) {
3630 case NETDEV_UP:
3631 vlan->vlan_ip = ifa->ifa_local;
3632 return NOTIFY_OK;
3633 case NETDEV_DOWN:
3634 vlan->vlan_ip =
3635 bond_glean_dev_ip(vlan_dev);
3636 return NOTIFY_OK;
3637 default:
3638 return NOTIFY_DONE;
3639 }
3640 }
3641 }
3642 }
3643 return NOTIFY_DONE;
3644 }
3645
3646 static struct notifier_block bond_netdev_notifier = {
3647 .notifier_call = bond_netdev_event,
3648 };
3649
3650 static struct notifier_block bond_inetaddr_notifier = {
3651 .notifier_call = bond_inetaddr_event,
3652 };
3653
3654 /*-------------------------- Packet type handling ---------------------------*/
3655
3656 /* register to receive lacpdus on a bond */
3657 static void bond_register_lacpdu(struct bonding *bond)
3658 {
3659 struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3660
3661 /* initialize packet type */
3662 pk_type->type = PKT_TYPE_LACPDU;
3663 pk_type->dev = bond->dev;
3664 pk_type->func = bond_3ad_lacpdu_recv;
3665
3666 dev_add_pack(pk_type);
3667 }
3668
3669 /* unregister to receive lacpdus on a bond */
3670 static void bond_unregister_lacpdu(struct bonding *bond)
3671 {
3672 dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3673 }
3674
3675 void bond_register_arp(struct bonding *bond)
3676 {
3677 struct packet_type *pt = &bond->arp_mon_pt;
3678
3679 if (pt->type)
3680 return;
3681
3682 pt->type = htons(ETH_P_ARP);
3683 pt->dev = bond->dev;
3684 pt->func = bond_arp_rcv;
3685 dev_add_pack(pt);
3686 }
3687
3688 void bond_unregister_arp(struct bonding *bond)
3689 {
3690 struct packet_type *pt = &bond->arp_mon_pt;
3691
3692 dev_remove_pack(pt);
3693 pt->type = 0;
3694 }
3695
3696 /*---------------------------- Hashing Policies -----------------------------*/
3697
3698 /*
3699 * Hash for the output device based upon layer 2 and layer 3 data. If
3700 * the packet is not IP mimic bond_xmit_hash_policy_l2()
3701 */
3702 static int bond_xmit_hash_policy_l23(struct sk_buff *skb,
3703 struct net_device *bond_dev, int count)
3704 {
3705 struct ethhdr *data = (struct ethhdr *)skb->data;
3706 struct iphdr *iph = ip_hdr(skb);
3707
3708 if (skb->protocol == htons(ETH_P_IP)) {
3709 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3710 (data->h_dest[5] ^ bond_dev->dev_addr[5])) % count;
3711 }
3712
3713 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3714 }
3715
3716 /*
3717 * Hash for the output device based upon layer 3 and layer 4 data. If
3718 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3719 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3720 */
3721 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3722 struct net_device *bond_dev, int count)
3723 {
3724 struct ethhdr *data = (struct ethhdr *)skb->data;
3725 struct iphdr *iph = ip_hdr(skb);
3726 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3727 int layer4_xor = 0;
3728
3729 if (skb->protocol == htons(ETH_P_IP)) {
3730 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3731 (iph->protocol == IPPROTO_TCP ||
3732 iph->protocol == IPPROTO_UDP)) {
3733 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3734 }
3735 return (layer4_xor ^
3736 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3737
3738 }
3739
3740 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3741 }
3742
3743 /*
3744 * Hash for the output device based upon layer 2 data
3745 */
3746 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3747 struct net_device *bond_dev, int count)
3748 {
3749 struct ethhdr *data = (struct ethhdr *)skb->data;
3750
3751 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3752 }
3753
3754 /*-------------------------- Device entry points ----------------------------*/
3755
3756 static int bond_open(struct net_device *bond_dev)
3757 {
3758 struct bonding *bond = netdev_priv(bond_dev);
3759
3760 bond->kill_timers = 0;
3761
3762 if (bond_is_lb(bond)) {
3763 /* bond_alb_initialize must be called before the timer
3764 * is started.
3765 */
3766 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3767 /* something went wrong - fail the open operation */
3768 return -1;
3769 }
3770
3771 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3772 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3773 }
3774
3775 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3776 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3777 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3778 }
3779
3780 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3781 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3782 INIT_DELAYED_WORK(&bond->arp_work,
3783 bond_activebackup_arp_mon);
3784 else
3785 INIT_DELAYED_WORK(&bond->arp_work,
3786 bond_loadbalance_arp_mon);
3787
3788 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3789 if (bond->params.arp_validate)
3790 bond_register_arp(bond);
3791 }
3792
3793 if (bond->params.mode == BOND_MODE_8023AD) {
3794 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3795 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3796 /* register to receive LACPDUs */
3797 bond_register_lacpdu(bond);
3798 bond_3ad_initiate_agg_selection(bond, 1);
3799 }
3800
3801 return 0;
3802 }
3803
3804 static int bond_close(struct net_device *bond_dev)
3805 {
3806 struct bonding *bond = netdev_priv(bond_dev);
3807
3808 if (bond->params.mode == BOND_MODE_8023AD) {
3809 /* Unregister the receive of LACPDUs */
3810 bond_unregister_lacpdu(bond);
3811 }
3812
3813 if (bond->params.arp_validate)
3814 bond_unregister_arp(bond);
3815
3816 write_lock_bh(&bond->lock);
3817
3818 bond->send_grat_arp = 0;
3819 bond->send_unsol_na = 0;
3820
3821 /* signal timers not to re-arm */
3822 bond->kill_timers = 1;
3823
3824 write_unlock_bh(&bond->lock);
3825
3826 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3827 cancel_delayed_work(&bond->mii_work);
3828 }
3829
3830 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3831 cancel_delayed_work(&bond->arp_work);
3832 }
3833
3834 switch (bond->params.mode) {
3835 case BOND_MODE_8023AD:
3836 cancel_delayed_work(&bond->ad_work);
3837 break;
3838 case BOND_MODE_TLB:
3839 case BOND_MODE_ALB:
3840 cancel_delayed_work(&bond->alb_work);
3841 break;
3842 default:
3843 break;
3844 }
3845
3846
3847 if (bond_is_lb(bond)) {
3848 /* Must be called only after all
3849 * slaves have been released
3850 */
3851 bond_alb_deinitialize(bond);
3852 }
3853
3854 return 0;
3855 }
3856
3857 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3858 {
3859 struct bonding *bond = netdev_priv(bond_dev);
3860 struct net_device_stats *stats = &bond->stats;
3861 struct net_device_stats local_stats;
3862 struct slave *slave;
3863 int i;
3864
3865 memset(&local_stats, 0, sizeof(struct net_device_stats));
3866
3867 read_lock_bh(&bond->lock);
3868
3869 bond_for_each_slave(bond, slave, i) {
3870 const struct net_device_stats *sstats = dev_get_stats(slave->dev);
3871
3872 local_stats.rx_packets += sstats->rx_packets;
3873 local_stats.rx_bytes += sstats->rx_bytes;
3874 local_stats.rx_errors += sstats->rx_errors;
3875 local_stats.rx_dropped += sstats->rx_dropped;
3876
3877 local_stats.tx_packets += sstats->tx_packets;
3878 local_stats.tx_bytes += sstats->tx_bytes;
3879 local_stats.tx_errors += sstats->tx_errors;
3880 local_stats.tx_dropped += sstats->tx_dropped;
3881
3882 local_stats.multicast += sstats->multicast;
3883 local_stats.collisions += sstats->collisions;
3884
3885 local_stats.rx_length_errors += sstats->rx_length_errors;
3886 local_stats.rx_over_errors += sstats->rx_over_errors;
3887 local_stats.rx_crc_errors += sstats->rx_crc_errors;
3888 local_stats.rx_frame_errors += sstats->rx_frame_errors;
3889 local_stats.rx_fifo_errors += sstats->rx_fifo_errors;
3890 local_stats.rx_missed_errors += sstats->rx_missed_errors;
3891
3892 local_stats.tx_aborted_errors += sstats->tx_aborted_errors;
3893 local_stats.tx_carrier_errors += sstats->tx_carrier_errors;
3894 local_stats.tx_fifo_errors += sstats->tx_fifo_errors;
3895 local_stats.tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3896 local_stats.tx_window_errors += sstats->tx_window_errors;
3897 }
3898
3899 memcpy(stats, &local_stats, sizeof(struct net_device_stats));
3900
3901 read_unlock_bh(&bond->lock);
3902
3903 return stats;
3904 }
3905
3906 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3907 {
3908 struct net_device *slave_dev = NULL;
3909 struct ifbond k_binfo;
3910 struct ifbond __user *u_binfo = NULL;
3911 struct ifslave k_sinfo;
3912 struct ifslave __user *u_sinfo = NULL;
3913 struct mii_ioctl_data *mii = NULL;
3914 int res = 0;
3915
3916 pr_debug("bond_ioctl: master=%s, cmd=%d\n",
3917 bond_dev->name, cmd);
3918
3919 switch (cmd) {
3920 case SIOCGMIIPHY:
3921 mii = if_mii(ifr);
3922 if (!mii)
3923 return -EINVAL;
3924
3925 mii->phy_id = 0;
3926 /* Fall Through */
3927 case SIOCGMIIREG:
3928 /*
3929 * We do this again just in case we were called by SIOCGMIIREG
3930 * instead of SIOCGMIIPHY.
3931 */
3932 mii = if_mii(ifr);
3933 if (!mii)
3934 return -EINVAL;
3935
3936
3937 if (mii->reg_num == 1) {
3938 struct bonding *bond = netdev_priv(bond_dev);
3939 mii->val_out = 0;
3940 read_lock(&bond->lock);
3941 read_lock(&bond->curr_slave_lock);
3942 if (netif_carrier_ok(bond->dev))
3943 mii->val_out = BMSR_LSTATUS;
3944
3945 read_unlock(&bond->curr_slave_lock);
3946 read_unlock(&bond->lock);
3947 }
3948
3949 return 0;
3950 case BOND_INFO_QUERY_OLD:
3951 case SIOCBONDINFOQUERY:
3952 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3953
3954 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3955 return -EFAULT;
3956
3957 res = bond_info_query(bond_dev, &k_binfo);
3958 if (res == 0 &&
3959 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3960 return -EFAULT;
3961
3962 return res;
3963 case BOND_SLAVE_INFO_QUERY_OLD:
3964 case SIOCBONDSLAVEINFOQUERY:
3965 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3966
3967 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3968 return -EFAULT;
3969
3970 res = bond_slave_info_query(bond_dev, &k_sinfo);
3971 if (res == 0 &&
3972 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3973 return -EFAULT;
3974
3975 return res;
3976 default:
3977 /* Go on */
3978 break;
3979 }
3980
3981 if (!capable(CAP_NET_ADMIN))
3982 return -EPERM;
3983
3984 slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
3985
3986 pr_debug("slave_dev=%p: \n", slave_dev);
3987
3988 if (!slave_dev)
3989 res = -ENODEV;
3990 else {
3991 pr_debug("slave_dev->name=%s: \n", slave_dev->name);
3992 switch (cmd) {
3993 case BOND_ENSLAVE_OLD:
3994 case SIOCBONDENSLAVE:
3995 res = bond_enslave(bond_dev, slave_dev);
3996 break;
3997 case BOND_RELEASE_OLD:
3998 case SIOCBONDRELEASE:
3999 res = bond_release(bond_dev, slave_dev);
4000 break;
4001 case BOND_SETHWADDR_OLD:
4002 case SIOCBONDSETHWADDR:
4003 res = bond_sethwaddr(bond_dev, slave_dev);
4004 break;
4005 case BOND_CHANGE_ACTIVE_OLD:
4006 case SIOCBONDCHANGEACTIVE:
4007 res = bond_ioctl_change_active(bond_dev, slave_dev);
4008 break;
4009 default:
4010 res = -EOPNOTSUPP;
4011 }
4012
4013 dev_put(slave_dev);
4014 }
4015
4016 return res;
4017 }
4018
4019 static void bond_set_multicast_list(struct net_device *bond_dev)
4020 {
4021 struct bonding *bond = netdev_priv(bond_dev);
4022 struct dev_mc_list *dmi;
4023
4024 /*
4025 * Do promisc before checking multicast_mode
4026 */
4027 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC))
4028 /*
4029 * FIXME: Need to handle the error when one of the multi-slaves
4030 * encounters error.
4031 */
4032 bond_set_promiscuity(bond, 1);
4033
4034
4035 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC))
4036 bond_set_promiscuity(bond, -1);
4037
4038
4039 /* set allmulti flag to slaves */
4040 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI))
4041 /*
4042 * FIXME: Need to handle the error when one of the multi-slaves
4043 * encounters error.
4044 */
4045 bond_set_allmulti(bond, 1);
4046
4047
4048 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI))
4049 bond_set_allmulti(bond, -1);
4050
4051
4052 read_lock(&bond->lock);
4053
4054 bond->flags = bond_dev->flags;
4055
4056 /* looking for addresses to add to slaves' mc list */
4057 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
4058 if (!bond_mc_list_find_dmi(dmi, bond->mc_list))
4059 bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4060 }
4061
4062 /* looking for addresses to delete from slaves' list */
4063 for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
4064 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list))
4065 bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4066 }
4067
4068 /* save master's multicast list */
4069 bond_mc_list_destroy(bond);
4070 bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
4071
4072 read_unlock(&bond->lock);
4073 }
4074
4075 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
4076 {
4077 struct bonding *bond = netdev_priv(dev);
4078 struct slave *slave = bond->first_slave;
4079
4080 if (slave) {
4081 const struct net_device_ops *slave_ops
4082 = slave->dev->netdev_ops;
4083 if (slave_ops->ndo_neigh_setup)
4084 return slave_ops->ndo_neigh_setup(slave->dev, parms);
4085 }
4086 return 0;
4087 }
4088
4089 /*
4090 * Change the MTU of all of a master's slaves to match the master
4091 */
4092 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4093 {
4094 struct bonding *bond = netdev_priv(bond_dev);
4095 struct slave *slave, *stop_at;
4096 int res = 0;
4097 int i;
4098
4099 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
4100 (bond_dev ? bond_dev->name : "None"), new_mtu);
4101
4102 /* Can't hold bond->lock with bh disabled here since
4103 * some base drivers panic. On the other hand we can't
4104 * hold bond->lock without bh disabled because we'll
4105 * deadlock. The only solution is to rely on the fact
4106 * that we're under rtnl_lock here, and the slaves
4107 * list won't change. This doesn't solve the problem
4108 * of setting the slave's MTU while it is
4109 * transmitting, but the assumption is that the base
4110 * driver can handle that.
4111 *
4112 * TODO: figure out a way to safely iterate the slaves
4113 * list, but without holding a lock around the actual
4114 * call to the base driver.
4115 */
4116
4117 bond_for_each_slave(bond, slave, i) {
4118 pr_debug("s %p s->p %p c_m %p\n", slave,
4119 slave->prev, slave->dev->netdev_ops->ndo_change_mtu);
4120
4121 res = dev_set_mtu(slave->dev, new_mtu);
4122
4123 if (res) {
4124 /* If we failed to set the slave's mtu to the new value
4125 * we must abort the operation even in ACTIVE_BACKUP
4126 * mode, because if we allow the backup slaves to have
4127 * different mtu values than the active slave we'll
4128 * need to change their mtu when doing a failover. That
4129 * means changing their mtu from timer context, which
4130 * is probably not a good idea.
4131 */
4132 pr_debug("err %d %s\n", res, slave->dev->name);
4133 goto unwind;
4134 }
4135 }
4136
4137 bond_dev->mtu = new_mtu;
4138
4139 return 0;
4140
4141 unwind:
4142 /* unwind from head to the slave that failed */
4143 stop_at = slave;
4144 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4145 int tmp_res;
4146
4147 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4148 if (tmp_res) {
4149 pr_debug("unwind err %d dev %s\n", tmp_res,
4150 slave->dev->name);
4151 }
4152 }
4153
4154 return res;
4155 }
4156
4157 /*
4158 * Change HW address
4159 *
4160 * Note that many devices must be down to change the HW address, and
4161 * downing the master releases all slaves. We can make bonds full of
4162 * bonding devices to test this, however.
4163 */
4164 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4165 {
4166 struct bonding *bond = netdev_priv(bond_dev);
4167 struct sockaddr *sa = addr, tmp_sa;
4168 struct slave *slave, *stop_at;
4169 int res = 0;
4170 int i;
4171
4172 if (bond->params.mode == BOND_MODE_ALB)
4173 return bond_alb_set_mac_address(bond_dev, addr);
4174
4175
4176 pr_debug("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
4177
4178 /*
4179 * If fail_over_mac is set to active, do nothing and return
4180 * success. Returning an error causes ifenslave to fail.
4181 */
4182 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
4183 return 0;
4184
4185 if (!is_valid_ether_addr(sa->sa_data))
4186 return -EADDRNOTAVAIL;
4187
4188 /* Can't hold bond->lock with bh disabled here since
4189 * some base drivers panic. On the other hand we can't
4190 * hold bond->lock without bh disabled because we'll
4191 * deadlock. The only solution is to rely on the fact
4192 * that we're under rtnl_lock here, and the slaves
4193 * list won't change. This doesn't solve the problem
4194 * of setting the slave's hw address while it is
4195 * transmitting, but the assumption is that the base
4196 * driver can handle that.
4197 *
4198 * TODO: figure out a way to safely iterate the slaves
4199 * list, but without holding a lock around the actual
4200 * call to the base driver.
4201 */
4202
4203 bond_for_each_slave(bond, slave, i) {
4204 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
4205 pr_debug("slave %p %s\n", slave, slave->dev->name);
4206
4207 if (slave_ops->ndo_set_mac_address == NULL) {
4208 res = -EOPNOTSUPP;
4209 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
4210 goto unwind;
4211 }
4212
4213 res = dev_set_mac_address(slave->dev, addr);
4214 if (res) {
4215 /* TODO: consider downing the slave
4216 * and retry ?
4217 * User should expect communications
4218 * breakage anyway until ARP finish
4219 * updating, so...
4220 */
4221 pr_debug("err %d %s\n", res, slave->dev->name);
4222 goto unwind;
4223 }
4224 }
4225
4226 /* success */
4227 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4228 return 0;
4229
4230 unwind:
4231 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4232 tmp_sa.sa_family = bond_dev->type;
4233
4234 /* unwind from head to the slave that failed */
4235 stop_at = slave;
4236 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4237 int tmp_res;
4238
4239 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4240 if (tmp_res) {
4241 pr_debug("unwind err %d dev %s\n", tmp_res,
4242 slave->dev->name);
4243 }
4244 }
4245
4246 return res;
4247 }
4248
4249 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4250 {
4251 struct bonding *bond = netdev_priv(bond_dev);
4252 struct slave *slave, *start_at;
4253 int i, slave_no, res = 1;
4254
4255 read_lock(&bond->lock);
4256
4257 if (!BOND_IS_OK(bond))
4258 goto out;
4259
4260 /*
4261 * Concurrent TX may collide on rr_tx_counter; we accept that
4262 * as being rare enough not to justify using an atomic op here
4263 */
4264 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4265
4266 bond_for_each_slave(bond, slave, i) {
4267 slave_no--;
4268 if (slave_no < 0)
4269 break;
4270 }
4271
4272 start_at = slave;
4273 bond_for_each_slave_from(bond, slave, i, start_at) {
4274 if (IS_UP(slave->dev) &&
4275 (slave->link == BOND_LINK_UP) &&
4276 (slave->state == BOND_STATE_ACTIVE)) {
4277 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4278 break;
4279 }
4280 }
4281
4282 out:
4283 if (res) {
4284 /* no suitable interface, frame not sent */
4285 dev_kfree_skb(skb);
4286 }
4287 read_unlock(&bond->lock);
4288 return 0;
4289 }
4290
4291
4292 /*
4293 * in active-backup mode, we know that bond->curr_active_slave is always valid if
4294 * the bond has a usable interface.
4295 */
4296 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4297 {
4298 struct bonding *bond = netdev_priv(bond_dev);
4299 int res = 1;
4300
4301 read_lock(&bond->lock);
4302 read_lock(&bond->curr_slave_lock);
4303
4304 if (!BOND_IS_OK(bond))
4305 goto out;
4306
4307 if (!bond->curr_active_slave)
4308 goto out;
4309
4310 res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4311
4312 out:
4313 if (res)
4314 /* no suitable interface, frame not sent */
4315 dev_kfree_skb(skb);
4316
4317 read_unlock(&bond->curr_slave_lock);
4318 read_unlock(&bond->lock);
4319 return 0;
4320 }
4321
4322 /*
4323 * In bond_xmit_xor() , we determine the output device by using a pre-
4324 * determined xmit_hash_policy(), If the selected device is not enabled,
4325 * find the next active slave.
4326 */
4327 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4328 {
4329 struct bonding *bond = netdev_priv(bond_dev);
4330 struct slave *slave, *start_at;
4331 int slave_no;
4332 int i;
4333 int res = 1;
4334
4335 read_lock(&bond->lock);
4336
4337 if (!BOND_IS_OK(bond))
4338 goto out;
4339
4340 slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4341
4342 bond_for_each_slave(bond, slave, i) {
4343 slave_no--;
4344 if (slave_no < 0)
4345 break;
4346 }
4347
4348 start_at = slave;
4349
4350 bond_for_each_slave_from(bond, slave, i, start_at) {
4351 if (IS_UP(slave->dev) &&
4352 (slave->link == BOND_LINK_UP) &&
4353 (slave->state == BOND_STATE_ACTIVE)) {
4354 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4355 break;
4356 }
4357 }
4358
4359 out:
4360 if (res) {
4361 /* no suitable interface, frame not sent */
4362 dev_kfree_skb(skb);
4363 }
4364 read_unlock(&bond->lock);
4365 return 0;
4366 }
4367
4368 /*
4369 * in broadcast mode, we send everything to all usable interfaces.
4370 */
4371 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4372 {
4373 struct bonding *bond = netdev_priv(bond_dev);
4374 struct slave *slave, *start_at;
4375 struct net_device *tx_dev = NULL;
4376 int i;
4377 int res = 1;
4378
4379 read_lock(&bond->lock);
4380
4381 if (!BOND_IS_OK(bond))
4382 goto out;
4383
4384 read_lock(&bond->curr_slave_lock);
4385 start_at = bond->curr_active_slave;
4386 read_unlock(&bond->curr_slave_lock);
4387
4388 if (!start_at)
4389 goto out;
4390
4391 bond_for_each_slave_from(bond, slave, i, start_at) {
4392 if (IS_UP(slave->dev) &&
4393 (slave->link == BOND_LINK_UP) &&
4394 (slave->state == BOND_STATE_ACTIVE)) {
4395 if (tx_dev) {
4396 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4397 if (!skb2) {
4398 pr_err(DRV_NAME
4399 ": %s: Error: bond_xmit_broadcast(): "
4400 "skb_clone() failed\n",
4401 bond_dev->name);
4402 continue;
4403 }
4404
4405 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4406 if (res) {
4407 dev_kfree_skb(skb2);
4408 continue;
4409 }
4410 }
4411 tx_dev = slave->dev;
4412 }
4413 }
4414
4415 if (tx_dev)
4416 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4417
4418 out:
4419 if (res)
4420 /* no suitable interface, frame not sent */
4421 dev_kfree_skb(skb);
4422
4423 /* frame sent to all suitable interfaces */
4424 read_unlock(&bond->lock);
4425 return 0;
4426 }
4427
4428 /*------------------------- Device initialization ---------------------------*/
4429
4430 static void bond_set_xmit_hash_policy(struct bonding *bond)
4431 {
4432 switch (bond->params.xmit_policy) {
4433 case BOND_XMIT_POLICY_LAYER23:
4434 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4435 break;
4436 case BOND_XMIT_POLICY_LAYER34:
4437 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4438 break;
4439 case BOND_XMIT_POLICY_LAYER2:
4440 default:
4441 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4442 break;
4443 }
4444 }
4445
4446 static int bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4447 {
4448 const struct bonding *bond = netdev_priv(dev);
4449
4450 switch (bond->params.mode) {
4451 case BOND_MODE_ROUNDROBIN:
4452 return bond_xmit_roundrobin(skb, dev);
4453 case BOND_MODE_ACTIVEBACKUP:
4454 return bond_xmit_activebackup(skb, dev);
4455 case BOND_MODE_XOR:
4456 return bond_xmit_xor(skb, dev);
4457 case BOND_MODE_BROADCAST:
4458 return bond_xmit_broadcast(skb, dev);
4459 case BOND_MODE_8023AD:
4460 return bond_3ad_xmit_xor(skb, dev);
4461 case BOND_MODE_ALB:
4462 case BOND_MODE_TLB:
4463 return bond_alb_xmit(skb, dev);
4464 default:
4465 /* Should never happen, mode already checked */
4466 pr_err(DRV_NAME ": %s: Error: Unknown bonding mode %d\n",
4467 dev->name, bond->params.mode);
4468 WARN_ON_ONCE(1);
4469 dev_kfree_skb(skb);
4470 return NETDEV_TX_OK;
4471 }
4472 }
4473
4474
4475 /*
4476 * set bond mode specific net device operations
4477 */
4478 void bond_set_mode_ops(struct bonding *bond, int mode)
4479 {
4480 struct net_device *bond_dev = bond->dev;
4481
4482 switch (mode) {
4483 case BOND_MODE_ROUNDROBIN:
4484 break;
4485 case BOND_MODE_ACTIVEBACKUP:
4486 break;
4487 case BOND_MODE_XOR:
4488 bond_set_xmit_hash_policy(bond);
4489 break;
4490 case BOND_MODE_BROADCAST:
4491 break;
4492 case BOND_MODE_8023AD:
4493 bond_set_master_3ad_flags(bond);
4494 bond_set_xmit_hash_policy(bond);
4495 break;
4496 case BOND_MODE_ALB:
4497 bond_set_master_alb_flags(bond);
4498 /* FALLTHRU */
4499 case BOND_MODE_TLB:
4500 break;
4501 default:
4502 /* Should never happen, mode already checked */
4503 pr_err(DRV_NAME
4504 ": %s: Error: Unknown bonding mode %d\n",
4505 bond_dev->name,
4506 mode);
4507 break;
4508 }
4509 }
4510
4511 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4512 struct ethtool_drvinfo *drvinfo)
4513 {
4514 strncpy(drvinfo->driver, DRV_NAME, 32);
4515 strncpy(drvinfo->version, DRV_VERSION, 32);
4516 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4517 }
4518
4519 static const struct ethtool_ops bond_ethtool_ops = {
4520 .get_drvinfo = bond_ethtool_get_drvinfo,
4521 .get_link = ethtool_op_get_link,
4522 .get_tx_csum = ethtool_op_get_tx_csum,
4523 .get_sg = ethtool_op_get_sg,
4524 .get_tso = ethtool_op_get_tso,
4525 .get_ufo = ethtool_op_get_ufo,
4526 .get_flags = ethtool_op_get_flags,
4527 };
4528
4529 static const struct net_device_ops bond_netdev_ops = {
4530 .ndo_init = bond_init,
4531 .ndo_uninit = bond_uninit,
4532 .ndo_open = bond_open,
4533 .ndo_stop = bond_close,
4534 .ndo_start_xmit = bond_start_xmit,
4535 .ndo_get_stats = bond_get_stats,
4536 .ndo_do_ioctl = bond_do_ioctl,
4537 .ndo_set_multicast_list = bond_set_multicast_list,
4538 .ndo_change_mtu = bond_change_mtu,
4539 .ndo_set_mac_address = bond_set_mac_address,
4540 .ndo_neigh_setup = bond_neigh_setup,
4541 .ndo_vlan_rx_register = bond_vlan_rx_register,
4542 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4543 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4544 };
4545
4546 static void bond_setup(struct net_device *bond_dev)
4547 {
4548 struct bonding *bond = netdev_priv(bond_dev);
4549
4550 /* initialize rwlocks */
4551 rwlock_init(&bond->lock);
4552 rwlock_init(&bond->curr_slave_lock);
4553
4554 bond->params = bonding_defaults;
4555
4556 /* Initialize pointers */
4557 bond->dev = bond_dev;
4558 INIT_LIST_HEAD(&bond->vlan_list);
4559
4560 /* Initialize the device entry points */
4561 ether_setup(bond_dev);
4562 bond_dev->netdev_ops = &bond_netdev_ops;
4563 bond_dev->ethtool_ops = &bond_ethtool_ops;
4564 bond_set_mode_ops(bond, bond->params.mode);
4565
4566 bond_dev->destructor = free_netdev;
4567
4568 /* Initialize the device options */
4569 bond_dev->tx_queue_len = 0;
4570 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4571 bond_dev->priv_flags |= IFF_BONDING;
4572 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
4573
4574 if (bond->params.arp_interval)
4575 bond_dev->priv_flags |= IFF_MASTER_ARPMON;
4576
4577 /* At first, we block adding VLANs. That's the only way to
4578 * prevent problems that occur when adding VLANs over an
4579 * empty bond. The block will be removed once non-challenged
4580 * slaves are enslaved.
4581 */
4582 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4583
4584 /* don't acquire bond device's netif_tx_lock when
4585 * transmitting */
4586 bond_dev->features |= NETIF_F_LLTX;
4587
4588 /* By default, we declare the bond to be fully
4589 * VLAN hardware accelerated capable. Special
4590 * care is taken in the various xmit functions
4591 * when there are slaves that are not hw accel
4592 * capable
4593 */
4594 bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4595 NETIF_F_HW_VLAN_RX |
4596 NETIF_F_HW_VLAN_FILTER);
4597
4598 }
4599
4600 static void bond_work_cancel_all(struct bonding *bond)
4601 {
4602 write_lock_bh(&bond->lock);
4603 bond->kill_timers = 1;
4604 write_unlock_bh(&bond->lock);
4605
4606 if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4607 cancel_delayed_work(&bond->mii_work);
4608
4609 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4610 cancel_delayed_work(&bond->arp_work);
4611
4612 if (bond->params.mode == BOND_MODE_ALB &&
4613 delayed_work_pending(&bond->alb_work))
4614 cancel_delayed_work(&bond->alb_work);
4615
4616 if (bond->params.mode == BOND_MODE_8023AD &&
4617 delayed_work_pending(&bond->ad_work))
4618 cancel_delayed_work(&bond->ad_work);
4619 }
4620
4621 /* De-initialize device specific data.
4622 * Caller must hold rtnl_lock.
4623 */
4624 static void bond_deinit(struct net_device *bond_dev)
4625 {
4626 struct bonding *bond = netdev_priv(bond_dev);
4627
4628 list_del(&bond->bond_list);
4629
4630 bond_work_cancel_all(bond);
4631
4632 bond_remove_proc_entry(bond);
4633 }
4634
4635 /* Unregister and free all bond devices.
4636 * Caller must hold rtnl_lock.
4637 */
4638 static void bond_free_all(void)
4639 {
4640 struct bonding *bond, *nxt;
4641
4642 list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4643 struct net_device *bond_dev = bond->dev;
4644
4645 bond_work_cancel_all(bond);
4646 /* Release the bonded slaves */
4647 bond_release_all(bond_dev);
4648 unregister_netdevice(bond_dev);
4649 }
4650
4651 bond_destroy_proc_dir();
4652 }
4653
4654 /*------------------------- Module initialization ---------------------------*/
4655
4656 /*
4657 * Convert string input module parms. Accept either the
4658 * number of the mode or its string name. A bit complicated because
4659 * some mode names are substrings of other names, and calls from sysfs
4660 * may have whitespace in the name (trailing newlines, for example).
4661 */
4662 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4663 {
4664 int modeint = -1, i, rv;
4665 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4666
4667 for (p = (char *)buf; *p; p++)
4668 if (!(isdigit(*p) || isspace(*p)))
4669 break;
4670
4671 if (*p)
4672 rv = sscanf(buf, "%20s", modestr);
4673 else
4674 rv = sscanf(buf, "%d", &modeint);
4675
4676 if (!rv)
4677 return -1;
4678
4679 for (i = 0; tbl[i].modename; i++) {
4680 if (modeint == tbl[i].mode)
4681 return tbl[i].mode;
4682 if (strcmp(modestr, tbl[i].modename) == 0)
4683 return tbl[i].mode;
4684 }
4685
4686 return -1;
4687 }
4688
4689 static int bond_check_params(struct bond_params *params)
4690 {
4691 int arp_validate_value, fail_over_mac_value;
4692
4693 /*
4694 * Convert string parameters.
4695 */
4696 if (mode) {
4697 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4698 if (bond_mode == -1) {
4699 pr_err(DRV_NAME
4700 ": Error: Invalid bonding mode \"%s\"\n",
4701 mode == NULL ? "NULL" : mode);
4702 return -EINVAL;
4703 }
4704 }
4705
4706 if (xmit_hash_policy) {
4707 if ((bond_mode != BOND_MODE_XOR) &&
4708 (bond_mode != BOND_MODE_8023AD)) {
4709 pr_info(DRV_NAME
4710 ": xor_mode param is irrelevant in mode %s\n",
4711 bond_mode_name(bond_mode));
4712 } else {
4713 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4714 xmit_hashtype_tbl);
4715 if (xmit_hashtype == -1) {
4716 pr_err(DRV_NAME
4717 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4718 xmit_hash_policy == NULL ? "NULL" :
4719 xmit_hash_policy);
4720 return -EINVAL;
4721 }
4722 }
4723 }
4724
4725 if (lacp_rate) {
4726 if (bond_mode != BOND_MODE_8023AD) {
4727 pr_info(DRV_NAME
4728 ": lacp_rate param is irrelevant in mode %s\n",
4729 bond_mode_name(bond_mode));
4730 } else {
4731 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4732 if (lacp_fast == -1) {
4733 pr_err(DRV_NAME
4734 ": Error: Invalid lacp rate \"%s\"\n",
4735 lacp_rate == NULL ? "NULL" : lacp_rate);
4736 return -EINVAL;
4737 }
4738 }
4739 }
4740
4741 if (ad_select) {
4742 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4743 if (params->ad_select == -1) {
4744 pr_err(DRV_NAME
4745 ": Error: Invalid ad_select \"%s\"\n",
4746 ad_select == NULL ? "NULL" : ad_select);
4747 return -EINVAL;
4748 }
4749
4750 if (bond_mode != BOND_MODE_8023AD) {
4751 pr_warning(DRV_NAME
4752 ": ad_select param only affects 802.3ad mode\n");
4753 }
4754 } else {
4755 params->ad_select = BOND_AD_STABLE;
4756 }
4757
4758 if (max_bonds < 0 || max_bonds > INT_MAX) {
4759 pr_warning(DRV_NAME
4760 ": Warning: max_bonds (%d) not in range %d-%d, so it "
4761 "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4762 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4763 max_bonds = BOND_DEFAULT_MAX_BONDS;
4764 }
4765
4766 if (miimon < 0) {
4767 pr_warning(DRV_NAME
4768 ": Warning: miimon module parameter (%d), "
4769 "not in range 0-%d, so it was reset to %d\n",
4770 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4771 miimon = BOND_LINK_MON_INTERV;
4772 }
4773
4774 if (updelay < 0) {
4775 pr_warning(DRV_NAME
4776 ": Warning: updelay module parameter (%d), "
4777 "not in range 0-%d, so it was reset to 0\n",
4778 updelay, INT_MAX);
4779 updelay = 0;
4780 }
4781
4782 if (downdelay < 0) {
4783 pr_warning(DRV_NAME
4784 ": Warning: downdelay module parameter (%d), "
4785 "not in range 0-%d, so it was reset to 0\n",
4786 downdelay, INT_MAX);
4787 downdelay = 0;
4788 }
4789
4790 if ((use_carrier != 0) && (use_carrier != 1)) {
4791 pr_warning(DRV_NAME
4792 ": Warning: use_carrier module parameter (%d), "
4793 "not of valid value (0/1), so it was set to 1\n",
4794 use_carrier);
4795 use_carrier = 1;
4796 }
4797
4798 if (num_grat_arp < 0 || num_grat_arp > 255) {
4799 pr_warning(DRV_NAME
4800 ": Warning: num_grat_arp (%d) not in range 0-255 so it "
4801 "was reset to 1 \n", num_grat_arp);
4802 num_grat_arp = 1;
4803 }
4804
4805 if (num_unsol_na < 0 || num_unsol_na > 255) {
4806 pr_warning(DRV_NAME
4807 ": Warning: num_unsol_na (%d) not in range 0-255 so it "
4808 "was reset to 1 \n", num_unsol_na);
4809 num_unsol_na = 1;
4810 }
4811
4812 /* reset values for 802.3ad */
4813 if (bond_mode == BOND_MODE_8023AD) {
4814 if (!miimon) {
4815 pr_warning(DRV_NAME
4816 ": Warning: miimon must be specified, "
4817 "otherwise bonding will not detect link "
4818 "failure, speed and duplex which are "
4819 "essential for 802.3ad operation\n");
4820 pr_warning("Forcing miimon to 100msec\n");
4821 miimon = 100;
4822 }
4823 }
4824
4825 /* reset values for TLB/ALB */
4826 if ((bond_mode == BOND_MODE_TLB) ||
4827 (bond_mode == BOND_MODE_ALB)) {
4828 if (!miimon) {
4829 pr_warning(DRV_NAME
4830 ": Warning: miimon must be specified, "
4831 "otherwise bonding will not detect link "
4832 "failure and link speed which are essential "
4833 "for TLB/ALB load balancing\n");
4834 pr_warning("Forcing miimon to 100msec\n");
4835 miimon = 100;
4836 }
4837 }
4838
4839 if (bond_mode == BOND_MODE_ALB) {
4840 printk(KERN_NOTICE DRV_NAME
4841 ": In ALB mode you might experience client "
4842 "disconnections upon reconnection of a link if the "
4843 "bonding module updelay parameter (%d msec) is "
4844 "incompatible with the forwarding delay time of the "
4845 "switch\n",
4846 updelay);
4847 }
4848
4849 if (!miimon) {
4850 if (updelay || downdelay) {
4851 /* just warn the user the up/down delay will have
4852 * no effect since miimon is zero...
4853 */
4854 pr_warning(DRV_NAME
4855 ": Warning: miimon module parameter not set "
4856 "and updelay (%d) or downdelay (%d) module "
4857 "parameter is set; updelay and downdelay have "
4858 "no effect unless miimon is set\n",
4859 updelay, downdelay);
4860 }
4861 } else {
4862 /* don't allow arp monitoring */
4863 if (arp_interval) {
4864 pr_warning(DRV_NAME
4865 ": Warning: miimon (%d) and arp_interval (%d) "
4866 "can't be used simultaneously, disabling ARP "
4867 "monitoring\n",
4868 miimon, arp_interval);
4869 arp_interval = 0;
4870 }
4871
4872 if ((updelay % miimon) != 0) {
4873 pr_warning(DRV_NAME
4874 ": Warning: updelay (%d) is not a multiple "
4875 "of miimon (%d), updelay rounded to %d ms\n",
4876 updelay, miimon, (updelay / miimon) * miimon);
4877 }
4878
4879 updelay /= miimon;
4880
4881 if ((downdelay % miimon) != 0) {
4882 pr_warning(DRV_NAME
4883 ": Warning: downdelay (%d) is not a multiple "
4884 "of miimon (%d), downdelay rounded to %d ms\n",
4885 downdelay, miimon,
4886 (downdelay / miimon) * miimon);
4887 }
4888
4889 downdelay /= miimon;
4890 }
4891
4892 if (arp_interval < 0) {
4893 pr_warning(DRV_NAME
4894 ": Warning: arp_interval module parameter (%d) "
4895 ", not in range 0-%d, so it was reset to %d\n",
4896 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4897 arp_interval = BOND_LINK_ARP_INTERV;
4898 }
4899
4900 for (arp_ip_count = 0;
4901 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4902 arp_ip_count++) {
4903 /* not complete check, but should be good enough to
4904 catch mistakes */
4905 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4906 pr_warning(DRV_NAME
4907 ": Warning: bad arp_ip_target module parameter "
4908 "(%s), ARP monitoring will not be performed\n",
4909 arp_ip_target[arp_ip_count]);
4910 arp_interval = 0;
4911 } else {
4912 __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4913 arp_target[arp_ip_count] = ip;
4914 }
4915 }
4916
4917 if (arp_interval && !arp_ip_count) {
4918 /* don't allow arping if no arp_ip_target given... */
4919 pr_warning(DRV_NAME
4920 ": Warning: arp_interval module parameter (%d) "
4921 "specified without providing an arp_ip_target "
4922 "parameter, arp_interval was reset to 0\n",
4923 arp_interval);
4924 arp_interval = 0;
4925 }
4926
4927 if (arp_validate) {
4928 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4929 pr_err(DRV_NAME
4930 ": arp_validate only supported in active-backup mode\n");
4931 return -EINVAL;
4932 }
4933 if (!arp_interval) {
4934 pr_err(DRV_NAME
4935 ": arp_validate requires arp_interval\n");
4936 return -EINVAL;
4937 }
4938
4939 arp_validate_value = bond_parse_parm(arp_validate,
4940 arp_validate_tbl);
4941 if (arp_validate_value == -1) {
4942 pr_err(DRV_NAME
4943 ": Error: invalid arp_validate \"%s\"\n",
4944 arp_validate == NULL ? "NULL" : arp_validate);
4945 return -EINVAL;
4946 }
4947 } else
4948 arp_validate_value = 0;
4949
4950 if (miimon) {
4951 pr_info(DRV_NAME
4952 ": MII link monitoring set to %d ms\n",
4953 miimon);
4954 } else if (arp_interval) {
4955 int i;
4956
4957 pr_info(DRV_NAME ": ARP monitoring set to %d ms,"
4958 " validate %s, with %d target(s):",
4959 arp_interval,
4960 arp_validate_tbl[arp_validate_value].modename,
4961 arp_ip_count);
4962
4963 for (i = 0; i < arp_ip_count; i++)
4964 printk(" %s", arp_ip_target[i]);
4965
4966 printk("\n");
4967
4968 } else if (max_bonds) {
4969 /* miimon and arp_interval not set, we need one so things
4970 * work as expected, see bonding.txt for details
4971 */
4972 pr_warning(DRV_NAME
4973 ": Warning: either miimon or arp_interval and "
4974 "arp_ip_target module parameters must be specified, "
4975 "otherwise bonding will not detect link failures! see "
4976 "bonding.txt for details.\n");
4977 }
4978
4979 if (primary && !USES_PRIMARY(bond_mode)) {
4980 /* currently, using a primary only makes sense
4981 * in active backup, TLB or ALB modes
4982 */
4983 pr_warning(DRV_NAME
4984 ": Warning: %s primary device specified but has no "
4985 "effect in %s mode\n",
4986 primary, bond_mode_name(bond_mode));
4987 primary = NULL;
4988 }
4989
4990 if (fail_over_mac) {
4991 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4992 fail_over_mac_tbl);
4993 if (fail_over_mac_value == -1) {
4994 pr_err(DRV_NAME
4995 ": Error: invalid fail_over_mac \"%s\"\n",
4996 arp_validate == NULL ? "NULL" : arp_validate);
4997 return -EINVAL;
4998 }
4999
5000 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5001 pr_warning(DRV_NAME
5002 ": Warning: fail_over_mac only affects "
5003 "active-backup mode.\n");
5004 } else {
5005 fail_over_mac_value = BOND_FOM_NONE;
5006 }
5007
5008 /* fill params struct with the proper values */
5009 params->mode = bond_mode;
5010 params->xmit_policy = xmit_hashtype;
5011 params->miimon = miimon;
5012 params->num_grat_arp = num_grat_arp;
5013 params->num_unsol_na = num_unsol_na;
5014 params->arp_interval = arp_interval;
5015 params->arp_validate = arp_validate_value;
5016 params->updelay = updelay;
5017 params->downdelay = downdelay;
5018 params->use_carrier = use_carrier;
5019 params->lacp_fast = lacp_fast;
5020 params->primary[0] = 0;
5021 params->fail_over_mac = fail_over_mac_value;
5022
5023 if (primary) {
5024 strncpy(params->primary, primary, IFNAMSIZ);
5025 params->primary[IFNAMSIZ - 1] = 0;
5026 }
5027
5028 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5029
5030 return 0;
5031 }
5032
5033 static struct lock_class_key bonding_netdev_xmit_lock_key;
5034 static struct lock_class_key bonding_netdev_addr_lock_key;
5035
5036 static void bond_set_lockdep_class_one(struct net_device *dev,
5037 struct netdev_queue *txq,
5038 void *_unused)
5039 {
5040 lockdep_set_class(&txq->_xmit_lock,
5041 &bonding_netdev_xmit_lock_key);
5042 }
5043
5044 static void bond_set_lockdep_class(struct net_device *dev)
5045 {
5046 lockdep_set_class(&dev->addr_list_lock,
5047 &bonding_netdev_addr_lock_key);
5048 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
5049 }
5050
5051 /*
5052 * Called from registration process
5053 */
5054 static int bond_init(struct net_device *bond_dev)
5055 {
5056 struct bonding *bond = netdev_priv(bond_dev);
5057
5058 pr_debug("Begin bond_init for %s\n", bond_dev->name);
5059
5060 bond->wq = create_singlethread_workqueue(bond_dev->name);
5061 if (!bond->wq)
5062 return -ENOMEM;
5063
5064 bond_set_lockdep_class(bond_dev);
5065
5066 netif_carrier_off(bond_dev);
5067
5068 bond_create_proc_entry(bond);
5069 list_add_tail(&bond->bond_list, &bond_dev_list);
5070
5071 return 0;
5072 }
5073
5074 /* Create a new bond based on the specified name and bonding parameters.
5075 * If name is NULL, obtain a suitable "bond%d" name for us.
5076 * Caller must NOT hold rtnl_lock; we need to release it here before we
5077 * set up our sysfs entries.
5078 */
5079 int bond_create(const char *name)
5080 {
5081 struct net_device *bond_dev;
5082 int res;
5083
5084 rtnl_lock();
5085 /* Check to see if the bond already exists. */
5086 /* FIXME: pass netns from caller */
5087 if (name && __dev_get_by_name(&init_net, name)) {
5088 pr_err(DRV_NAME ": cannot add bond %s; already exists\n",
5089 name);
5090 res = -EEXIST;
5091 goto out_rtnl;
5092 }
5093
5094 bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
5095 bond_setup);
5096 if (!bond_dev) {
5097 pr_err(DRV_NAME ": %s: eek! can't alloc netdev!\n",
5098 name);
5099 res = -ENOMEM;
5100 goto out_rtnl;
5101 }
5102
5103 if (!name) {
5104 res = dev_alloc_name(bond_dev, "bond%d");
5105 if (res < 0)
5106 goto out_netdev;
5107 }
5108
5109 res = register_netdevice(bond_dev);
5110 if (res < 0)
5111 goto out_bond;
5112
5113 res = bond_create_sysfs_entry(netdev_priv(bond_dev));
5114 if (res < 0)
5115 goto out_unreg;
5116
5117 rtnl_unlock();
5118 return 0;
5119
5120 out_unreg:
5121 unregister_netdevice(bond_dev);
5122 out_bond:
5123 bond_deinit(bond_dev);
5124 out_netdev:
5125 free_netdev(bond_dev);
5126 out_rtnl:
5127 rtnl_unlock();
5128 return res;
5129 }
5130
5131 static int __init bonding_init(void)
5132 {
5133 int i;
5134 int res;
5135
5136 pr_info("%s", version);
5137
5138 res = bond_check_params(&bonding_defaults);
5139 if (res)
5140 goto out;
5141
5142 bond_create_proc_dir();
5143
5144 for (i = 0; i < max_bonds; i++) {
5145 res = bond_create(NULL);
5146 if (res)
5147 goto err;
5148 }
5149
5150 res = bond_create_sysfs();
5151 if (res)
5152 goto err;
5153
5154 register_netdevice_notifier(&bond_netdev_notifier);
5155 register_inetaddr_notifier(&bond_inetaddr_notifier);
5156 bond_register_ipv6_notifier();
5157
5158 goto out;
5159 err:
5160 rtnl_lock();
5161 bond_free_all();
5162 rtnl_unlock();
5163 out:
5164 return res;
5165
5166 }
5167
5168 static void __exit bonding_exit(void)
5169 {
5170 unregister_netdevice_notifier(&bond_netdev_notifier);
5171 unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5172 bond_unregister_ipv6_notifier();
5173
5174 bond_destroy_sysfs();
5175
5176 rtnl_lock();
5177 bond_free_all();
5178 rtnl_unlock();
5179 }
5180
5181 module_init(bonding_init);
5182 module_exit(bonding_exit);
5183 MODULE_LICENSE("GPL");
5184 MODULE_VERSION(DRV_VERSION);
5185 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5186 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
Linux kernel - Deliverables
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