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1/*
2 * originally based on the dummy device.
3 *
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
6 *
7 * bonding.c: an Ethernet Bonding driver
8 *
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
10 * Cisco 5500
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
13 * Linux Bonding
14 * and probably many L2 switches ...
15 *
16 * How it works:
17 * ifconfig bond0 ipaddress netmask up
18 * will setup a network device, with an ip address. No mac address
19 * will be assigned at this time. The hw mac address will come from
20 * the first slave bonded to the channel. All slaves will then use
21 * this hw mac address.
22 *
23 * ifconfig bond0 down
24 * will release all slaves, marking them as down.
25 *
26 * ifenslave bond0 eth0
27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either
28 * a: be used as initial mac address
29 * b: if a hw mac address already is there, eth0's hw mac address
30 * will then be set from bond0.
31 *
32 */
33
34#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
35
36#include <linux/kernel.h>
37#include <linux/module.h>
38#include <linux/types.h>
39#include <linux/fcntl.h>
40#include <linux/interrupt.h>
41#include <linux/ptrace.h>
42#include <linux/ioport.h>
43#include <linux/in.h>
44#include <net/ip.h>
45#include <linux/ip.h>
46#include <linux/tcp.h>
47#include <linux/udp.h>
48#include <linux/slab.h>
49#include <linux/string.h>
50#include <linux/init.h>
51#include <linux/timer.h>
52#include <linux/socket.h>
53#include <linux/ctype.h>
54#include <linux/inet.h>
55#include <linux/bitops.h>
56#include <linux/io.h>
57#include <asm/system.h>
58#include <asm/dma.h>
59#include <linux/uaccess.h>
60#include <linux/errno.h>
61#include <linux/netdevice.h>
62#include <linux/inetdevice.h>
63#include <linux/igmp.h>
64#include <linux/etherdevice.h>
65#include <linux/skbuff.h>
66#include <net/sock.h>
67#include <linux/rtnetlink.h>
68#include <linux/proc_fs.h>
69#include <linux/seq_file.h>
70#include <linux/smp.h>
71#include <linux/if_ether.h>
72#include <net/arp.h>
73#include <linux/mii.h>
74#include <linux/ethtool.h>
75#include <linux/if_vlan.h>
76#include <linux/if_bonding.h>
77#include <linux/jiffies.h>
78#include <net/route.h>
79#include <net/net_namespace.h>
80#include <net/netns/generic.h>
81#include "bonding.h"
82#include "bond_3ad.h"
83#include "bond_alb.h"
84
85/*---------------------------- Module parameters ----------------------------*/
86
87/* monitor all links that often (in milliseconds). <=0 disables monitoring */
88#define BOND_LINK_MON_INTERV 0
89#define BOND_LINK_ARP_INTERV 0
90
91static int max_bonds = BOND_DEFAULT_MAX_BONDS;
92static int num_grat_arp = 1;
93static int num_unsol_na = 1;
94static int miimon = BOND_LINK_MON_INTERV;
95static int updelay;
96static int downdelay;
97static int use_carrier = 1;
98static char *mode;
99static char *primary;
100static char *primary_reselect;
101static char *lacp_rate;
102static char *ad_select;
103static char *xmit_hash_policy;
104static int arp_interval = BOND_LINK_ARP_INTERV;
105static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
106static char *arp_validate;
107static char *fail_over_mac;
108static struct bond_params bonding_defaults;
109
110module_param(max_bonds, int, 0);
111MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
112module_param(num_grat_arp, int, 0644);
113MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
114module_param(num_unsol_na, int, 0644);
115MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
116module_param(miimon, int, 0);
117MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
118module_param(updelay, int, 0);
119MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
120module_param(downdelay, int, 0);
121MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
122 "in milliseconds");
123module_param(use_carrier, int, 0);
124MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
125 "0 for off, 1 for on (default)");
126module_param(mode, charp, 0);
127MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
128 "1 for active-backup, 2 for balance-xor, "
129 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
130 "6 for balance-alb");
131module_param(primary, charp, 0);
132MODULE_PARM_DESC(primary, "Primary network device to use");
133module_param(primary_reselect, charp, 0);
134MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
135 "once it comes up; "
136 "0 for always (default), "
137 "1 for only if speed of primary is "
138 "better, "
139 "2 for only on active slave "
140 "failure");
141module_param(lacp_rate, charp, 0);
142MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
143 "(slow/fast)");
144module_param(ad_select, charp, 0);
145MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
146module_param(xmit_hash_policy, charp, 0);
147MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
148 ", 1 for layer 3+4");
149module_param(arp_interval, int, 0);
150MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
151module_param_array(arp_ip_target, charp, NULL, 0);
152MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
153module_param(arp_validate, charp, 0);
154MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
155module_param(fail_over_mac, charp, 0);
156MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC. none (default), active or follow");
157
158/*----------------------------- Global variables ----------------------------*/
159
160static const char * const version =
161 DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
162
163int bond_net_id __read_mostly;
164
165static __be32 arp_target[BOND_MAX_ARP_TARGETS];
166static int arp_ip_count;
167static int bond_mode = BOND_MODE_ROUNDROBIN;
168static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
169static int lacp_fast;
170
171
172const struct bond_parm_tbl bond_lacp_tbl[] = {
173{ "slow", AD_LACP_SLOW},
174{ "fast", AD_LACP_FAST},
175{ NULL, -1},
176};
177
178const struct bond_parm_tbl bond_mode_tbl[] = {
179{ "balance-rr", BOND_MODE_ROUNDROBIN},
180{ "active-backup", BOND_MODE_ACTIVEBACKUP},
181{ "balance-xor", BOND_MODE_XOR},
182{ "broadcast", BOND_MODE_BROADCAST},
183{ "802.3ad", BOND_MODE_8023AD},
184{ "balance-tlb", BOND_MODE_TLB},
185{ "balance-alb", BOND_MODE_ALB},
186{ NULL, -1},
187};
188
189const struct bond_parm_tbl xmit_hashtype_tbl[] = {
190{ "layer2", BOND_XMIT_POLICY_LAYER2},
191{ "layer3+4", BOND_XMIT_POLICY_LAYER34},
192{ "layer2+3", BOND_XMIT_POLICY_LAYER23},
193{ NULL, -1},
194};
195
196const struct bond_parm_tbl arp_validate_tbl[] = {
197{ "none", BOND_ARP_VALIDATE_NONE},
198{ "active", BOND_ARP_VALIDATE_ACTIVE},
199{ "backup", BOND_ARP_VALIDATE_BACKUP},
200{ "all", BOND_ARP_VALIDATE_ALL},
201{ NULL, -1},
202};
203
204const struct bond_parm_tbl fail_over_mac_tbl[] = {
205{ "none", BOND_FOM_NONE},
206{ "active", BOND_FOM_ACTIVE},
207{ "follow", BOND_FOM_FOLLOW},
208{ NULL, -1},
209};
210
211const struct bond_parm_tbl pri_reselect_tbl[] = {
212{ "always", BOND_PRI_RESELECT_ALWAYS},
213{ "better", BOND_PRI_RESELECT_BETTER},
214{ "failure", BOND_PRI_RESELECT_FAILURE},
215{ NULL, -1},
216};
217
218struct bond_parm_tbl ad_select_tbl[] = {
219{ "stable", BOND_AD_STABLE},
220{ "bandwidth", BOND_AD_BANDWIDTH},
221{ "count", BOND_AD_COUNT},
222{ NULL, -1},
223};
224
225/*-------------------------- Forward declarations ---------------------------*/
226
227static void bond_send_gratuitous_arp(struct bonding *bond);
228static int bond_init(struct net_device *bond_dev);
229static void bond_uninit(struct net_device *bond_dev);
230
231/*---------------------------- General routines -----------------------------*/
232
233static const char *bond_mode_name(int mode)
234{
235 static const char *names[] = {
236 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
237 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
238 [BOND_MODE_XOR] = "load balancing (xor)",
239 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
240 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
241 [BOND_MODE_TLB] = "transmit load balancing",
242 [BOND_MODE_ALB] = "adaptive load balancing",
243 };
244
245 if (mode < 0 || mode > BOND_MODE_ALB)
246 return "unknown";
247
248 return names[mode];
249}
250
251/*---------------------------------- VLAN -----------------------------------*/
252
253/**
254 * bond_add_vlan - add a new vlan id on bond
255 * @bond: bond that got the notification
256 * @vlan_id: the vlan id to add
257 *
258 * Returns -ENOMEM if allocation failed.
259 */
260static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
261{
262 struct vlan_entry *vlan;
263
264 pr_debug("bond: %s, vlan id %d\n",
265 (bond ? bond->dev->name : "None"), vlan_id);
266
267 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
268 if (!vlan)
269 return -ENOMEM;
270
271 INIT_LIST_HEAD(&vlan->vlan_list);
272 vlan->vlan_id = vlan_id;
273
274 write_lock_bh(&bond->lock);
275
276 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
277
278 write_unlock_bh(&bond->lock);
279
280 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
281
282 return 0;
283}
284
285/**
286 * bond_del_vlan - delete a vlan id from bond
287 * @bond: bond that got the notification
288 * @vlan_id: the vlan id to delete
289 *
290 * returns -ENODEV if @vlan_id was not found in @bond.
291 */
292static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
293{
294 struct vlan_entry *vlan;
295 int res = -ENODEV;
296
297 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
298
299 write_lock_bh(&bond->lock);
300
301 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
302 if (vlan->vlan_id == vlan_id) {
303 list_del(&vlan->vlan_list);
304
305 if (bond_is_lb(bond))
306 bond_alb_clear_vlan(bond, vlan_id);
307
308 pr_debug("removed VLAN ID %d from bond %s\n",
309 vlan_id, bond->dev->name);
310
311 kfree(vlan);
312
313 if (list_empty(&bond->vlan_list) &&
314 (bond->slave_cnt == 0)) {
315 /* Last VLAN removed and no slaves, so
316 * restore block on adding VLANs. This will
317 * be removed once new slaves that are not
318 * VLAN challenged will be added.
319 */
320 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
321 }
322
323 res = 0;
324 goto out;
325 }
326 }
327
328 pr_debug("couldn't find VLAN ID %d in bond %s\n",
329 vlan_id, bond->dev->name);
330
331out:
332 write_unlock_bh(&bond->lock);
333 return res;
334}
335
336/**
337 * bond_has_challenged_slaves
338 * @bond: the bond we're working on
339 *
340 * Searches the slave list. Returns 1 if a vlan challenged slave
341 * was found, 0 otherwise.
342 *
343 * Assumes bond->lock is held.
344 */
345static int bond_has_challenged_slaves(struct bonding *bond)
346{
347 struct slave *slave;
348 int i;
349
350 bond_for_each_slave(bond, slave, i) {
351 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
352 pr_debug("found VLAN challenged slave - %s\n",
353 slave->dev->name);
354 return 1;
355 }
356 }
357
358 pr_debug("no VLAN challenged slaves found\n");
359 return 0;
360}
361
362/**
363 * bond_next_vlan - safely skip to the next item in the vlans list.
364 * @bond: the bond we're working on
365 * @curr: item we're advancing from
366 *
367 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
368 * or @curr->next otherwise (even if it is @curr itself again).
369 *
370 * Caller must hold bond->lock
371 */
372struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
373{
374 struct vlan_entry *next, *last;
375
376 if (list_empty(&bond->vlan_list))
377 return NULL;
378
379 if (!curr) {
380 next = list_entry(bond->vlan_list.next,
381 struct vlan_entry, vlan_list);
382 } else {
383 last = list_entry(bond->vlan_list.prev,
384 struct vlan_entry, vlan_list);
385 if (last == curr) {
386 next = list_entry(bond->vlan_list.next,
387 struct vlan_entry, vlan_list);
388 } else {
389 next = list_entry(curr->vlan_list.next,
390 struct vlan_entry, vlan_list);
391 }
392 }
393
394 return next;
395}
396
397/**
398 * bond_dev_queue_xmit - Prepare skb for xmit.
399 *
400 * @bond: bond device that got this skb for tx.
401 * @skb: hw accel VLAN tagged skb to transmit
402 * @slave_dev: slave that is supposed to xmit this skbuff
403 *
404 * When the bond gets an skb to transmit that is
405 * already hardware accelerated VLAN tagged, and it
406 * needs to relay this skb to a slave that is not
407 * hw accel capable, the skb needs to be "unaccelerated",
408 * i.e. strip the hwaccel tag and re-insert it as part
409 * of the payload.
410 */
411int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
412 struct net_device *slave_dev)
413{
414 unsigned short uninitialized_var(vlan_id);
415
416 if (!list_empty(&bond->vlan_list) &&
417 !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
418 vlan_get_tag(skb, &vlan_id) == 0) {
419 skb->dev = slave_dev;
420 skb = vlan_put_tag(skb, vlan_id);
421 if (!skb) {
422 /* vlan_put_tag() frees the skb in case of error,
423 * so return success here so the calling functions
424 * won't attempt to free is again.
425 */
426 return 0;
427 }
428 } else {
429 skb->dev = slave_dev;
430 }
431
432 skb->priority = 1;
433 dev_queue_xmit(skb);
434
435 return 0;
436}
437
438/*
439 * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
440 * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
441 * lock because:
442 * a. This operation is performed in IOCTL context,
443 * b. The operation is protected by the RTNL semaphore in the 8021q code,
444 * c. Holding a lock with BH disabled while directly calling a base driver
445 * entry point is generally a BAD idea.
446 *
447 * The design of synchronization/protection for this operation in the 8021q
448 * module is good for one or more VLAN devices over a single physical device
449 * and cannot be extended for a teaming solution like bonding, so there is a
450 * potential race condition here where a net device from the vlan group might
451 * be referenced (either by a base driver or the 8021q code) while it is being
452 * removed from the system. However, it turns out we're not making matters
453 * worse, and if it works for regular VLAN usage it will work here too.
454*/
455
456/**
457 * bond_vlan_rx_register - Propagates registration to slaves
458 * @bond_dev: bonding net device that got called
459 * @grp: vlan group being registered
460 */
461static void bond_vlan_rx_register(struct net_device *bond_dev,
462 struct vlan_group *grp)
463{
464 struct bonding *bond = netdev_priv(bond_dev);
465 struct slave *slave;
466 int i;
467
468 bond->vlgrp = grp;
469
470 bond_for_each_slave(bond, slave, i) {
471 struct net_device *slave_dev = slave->dev;
472 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
473
474 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
475 slave_ops->ndo_vlan_rx_register) {
476 slave_ops->ndo_vlan_rx_register(slave_dev, grp);
477 }
478 }
479}
480
481/**
482 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
483 * @bond_dev: bonding net device that got called
484 * @vid: vlan id being added
485 */
486static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
487{
488 struct bonding *bond = netdev_priv(bond_dev);
489 struct slave *slave;
490 int i, res;
491
492 bond_for_each_slave(bond, slave, i) {
493 struct net_device *slave_dev = slave->dev;
494 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
495
496 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
497 slave_ops->ndo_vlan_rx_add_vid) {
498 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
499 }
500 }
501
502 res = bond_add_vlan(bond, vid);
503 if (res) {
504 pr_err("%s: Error: Failed to add vlan id %d\n",
505 bond_dev->name, vid);
506 }
507}
508
509/**
510 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
511 * @bond_dev: bonding net device that got called
512 * @vid: vlan id being removed
513 */
514static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
515{
516 struct bonding *bond = netdev_priv(bond_dev);
517 struct slave *slave;
518 struct net_device *vlan_dev;
519 int i, res;
520
521 bond_for_each_slave(bond, slave, i) {
522 struct net_device *slave_dev = slave->dev;
523 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
524
525 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
526 slave_ops->ndo_vlan_rx_kill_vid) {
527 /* Save and then restore vlan_dev in the grp array,
528 * since the slave's driver might clear it.
529 */
530 vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
531 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
532 vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
533 }
534 }
535
536 res = bond_del_vlan(bond, vid);
537 if (res) {
538 pr_err("%s: Error: Failed to remove vlan id %d\n",
539 bond_dev->name, vid);
540 }
541}
542
543static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
544{
545 struct vlan_entry *vlan;
546 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
547
548 write_lock_bh(&bond->lock);
549
550 if (list_empty(&bond->vlan_list))
551 goto out;
552
553 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
554 slave_ops->ndo_vlan_rx_register)
555 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
556
557 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
558 !(slave_ops->ndo_vlan_rx_add_vid))
559 goto out;
560
561 list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
562 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
563
564out:
565 write_unlock_bh(&bond->lock);
566}
567
568static void bond_del_vlans_from_slave(struct bonding *bond,
569 struct net_device *slave_dev)
570{
571 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
572 struct vlan_entry *vlan;
573 struct net_device *vlan_dev;
574
575 write_lock_bh(&bond->lock);
576
577 if (list_empty(&bond->vlan_list))
578 goto out;
579
580 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
581 !(slave_ops->ndo_vlan_rx_kill_vid))
582 goto unreg;
583
584 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
585 /* Save and then restore vlan_dev in the grp array,
586 * since the slave's driver might clear it.
587 */
588 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
589 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
590 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
591 }
592
593unreg:
594 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
595 slave_ops->ndo_vlan_rx_register)
596 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
597
598out:
599 write_unlock_bh(&bond->lock);
600}
601
602/*------------------------------- Link status -------------------------------*/
603
604/*
605 * Set the carrier state for the master according to the state of its
606 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
607 * do special 802.3ad magic.
608 *
609 * Returns zero if carrier state does not change, nonzero if it does.
610 */
611static int bond_set_carrier(struct bonding *bond)
612{
613 struct slave *slave;
614 int i;
615
616 if (bond->slave_cnt == 0)
617 goto down;
618
619 if (bond->params.mode == BOND_MODE_8023AD)
620 return bond_3ad_set_carrier(bond);
621
622 bond_for_each_slave(bond, slave, i) {
623 if (slave->link == BOND_LINK_UP) {
624 if (!netif_carrier_ok(bond->dev)) {
625 netif_carrier_on(bond->dev);
626 return 1;
627 }
628 return 0;
629 }
630 }
631
632down:
633 if (netif_carrier_ok(bond->dev)) {
634 netif_carrier_off(bond->dev);
635 return 1;
636 }
637 return 0;
638}
639
640/*
641 * Get link speed and duplex from the slave's base driver
642 * using ethtool. If for some reason the call fails or the
643 * values are invalid, fake speed and duplex to 100/Full
644 * and return error.
645 */
646static int bond_update_speed_duplex(struct slave *slave)
647{
648 struct net_device *slave_dev = slave->dev;
649 struct ethtool_cmd etool;
650 int res;
651
652 /* Fake speed and duplex */
653 slave->speed = SPEED_100;
654 slave->duplex = DUPLEX_FULL;
655
656 if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
657 return -1;
658
659 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
660 if (res < 0)
661 return -1;
662
663 switch (etool.speed) {
664 case SPEED_10:
665 case SPEED_100:
666 case SPEED_1000:
667 case SPEED_10000:
668 break;
669 default:
670 return -1;
671 }
672
673 switch (etool.duplex) {
674 case DUPLEX_FULL:
675 case DUPLEX_HALF:
676 break;
677 default:
678 return -1;
679 }
680
681 slave->speed = etool.speed;
682 slave->duplex = etool.duplex;
683
684 return 0;
685}
686
687/*
688 * if <dev> supports MII link status reporting, check its link status.
689 *
690 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
691 * depending upon the setting of the use_carrier parameter.
692 *
693 * Return either BMSR_LSTATUS, meaning that the link is up (or we
694 * can't tell and just pretend it is), or 0, meaning that the link is
695 * down.
696 *
697 * If reporting is non-zero, instead of faking link up, return -1 if
698 * both ETHTOOL and MII ioctls fail (meaning the device does not
699 * support them). If use_carrier is set, return whatever it says.
700 * It'd be nice if there was a good way to tell if a driver supports
701 * netif_carrier, but there really isn't.
702 */
703static int bond_check_dev_link(struct bonding *bond,
704 struct net_device *slave_dev, int reporting)
705{
706 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
707 int (*ioctl)(struct net_device *, struct ifreq *, int);
708 struct ifreq ifr;
709 struct mii_ioctl_data *mii;
710
711 if (!reporting && !netif_running(slave_dev))
712 return 0;
713
714 if (bond->params.use_carrier)
715 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
716
717 /* Try to get link status using Ethtool first. */
718 if (slave_dev->ethtool_ops) {
719 if (slave_dev->ethtool_ops->get_link) {
720 u32 link;
721
722 link = slave_dev->ethtool_ops->get_link(slave_dev);
723
724 return link ? BMSR_LSTATUS : 0;
725 }
726 }
727
728 /* Ethtool can't be used, fallback to MII ioctls. */
729 ioctl = slave_ops->ndo_do_ioctl;
730 if (ioctl) {
731 /* TODO: set pointer to correct ioctl on a per team member */
732 /* bases to make this more efficient. that is, once */
733 /* we determine the correct ioctl, we will always */
734 /* call it and not the others for that team */
735 /* member. */
736
737 /*
738 * We cannot assume that SIOCGMIIPHY will also read a
739 * register; not all network drivers (e.g., e100)
740 * support that.
741 */
742
743 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
744 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
745 mii = if_mii(&ifr);
746 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
747 mii->reg_num = MII_BMSR;
748 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
749 return mii->val_out & BMSR_LSTATUS;
750 }
751 }
752
753 /*
754 * If reporting, report that either there's no dev->do_ioctl,
755 * or both SIOCGMIIREG and get_link failed (meaning that we
756 * cannot report link status). If not reporting, pretend
757 * we're ok.
758 */
759 return reporting ? -1 : BMSR_LSTATUS;
760}
761
762/*----------------------------- Multicast list ------------------------------*/
763
764/*
765 * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
766 */
767static inline int bond_is_dmi_same(const struct dev_mc_list *dmi1,
768 const struct dev_mc_list *dmi2)
769{
770 return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
771 dmi1->dmi_addrlen == dmi2->dmi_addrlen;
772}
773
774/*
775 * returns dmi entry if found, NULL otherwise
776 */
777static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi,
778 struct dev_mc_list *mc_list)
779{
780 struct dev_mc_list *idmi;
781
782 for (idmi = mc_list; idmi; idmi = idmi->next) {
783 if (bond_is_dmi_same(dmi, idmi))
784 return idmi;
785 }
786
787 return NULL;
788}
789
790/*
791 * Push the promiscuity flag down to appropriate slaves
792 */
793static int bond_set_promiscuity(struct bonding *bond, int inc)
794{
795 int err = 0;
796 if (USES_PRIMARY(bond->params.mode)) {
797 /* write lock already acquired */
798 if (bond->curr_active_slave) {
799 err = dev_set_promiscuity(bond->curr_active_slave->dev,
800 inc);
801 }
802 } else {
803 struct slave *slave;
804 int i;
805 bond_for_each_slave(bond, slave, i) {
806 err = dev_set_promiscuity(slave->dev, inc);
807 if (err)
808 return err;
809 }
810 }
811 return err;
812}
813
814/*
815 * Push the allmulti flag down to all slaves
816 */
817static int bond_set_allmulti(struct bonding *bond, int inc)
818{
819 int err = 0;
820 if (USES_PRIMARY(bond->params.mode)) {
821 /* write lock already acquired */
822 if (bond->curr_active_slave) {
823 err = dev_set_allmulti(bond->curr_active_slave->dev,
824 inc);
825 }
826 } else {
827 struct slave *slave;
828 int i;
829 bond_for_each_slave(bond, slave, i) {
830 err = dev_set_allmulti(slave->dev, inc);
831 if (err)
832 return err;
833 }
834 }
835 return err;
836}
837
838/*
839 * Add a Multicast address to slaves
840 * according to mode
841 */
842static void bond_mc_add(struct bonding *bond, void *addr, int alen)
843{
844 if (USES_PRIMARY(bond->params.mode)) {
845 /* write lock already acquired */
846 if (bond->curr_active_slave)
847 dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
848 } else {
849 struct slave *slave;
850 int i;
851
852 bond_for_each_slave(bond, slave, i)
853 dev_mc_add(slave->dev, addr, alen, 0);
854 }
855}
856
857/*
858 * Remove a multicast address from slave
859 * according to mode
860 */
861static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
862{
863 if (USES_PRIMARY(bond->params.mode)) {
864 /* write lock already acquired */
865 if (bond->curr_active_slave)
866 dev_mc_delete(bond->curr_active_slave->dev, addr,
867 alen, 0);
868 } else {
869 struct slave *slave;
870 int i;
871 bond_for_each_slave(bond, slave, i) {
872 dev_mc_delete(slave->dev, addr, alen, 0);
873 }
874 }
875}
876
877
878/*
879 * Retrieve the list of registered multicast addresses for the bonding
880 * device and retransmit an IGMP JOIN request to the current active
881 * slave.
882 */
883static void bond_resend_igmp_join_requests(struct bonding *bond)
884{
885 struct in_device *in_dev;
886 struct ip_mc_list *im;
887
888 rcu_read_lock();
889 in_dev = __in_dev_get_rcu(bond->dev);
890 if (in_dev) {
891 for (im = in_dev->mc_list; im; im = im->next)
892 ip_mc_rejoin_group(im);
893 }
894
895 rcu_read_unlock();
896}
897
898/*
899 * Totally destroys the mc_list in bond
900 */
901static void bond_mc_list_destroy(struct bonding *bond)
902{
903 struct dev_mc_list *dmi;
904
905 dmi = bond->mc_list;
906 while (dmi) {
907 bond->mc_list = dmi->next;
908 kfree(dmi);
909 dmi = bond->mc_list;
910 }
911
912 bond->mc_list = NULL;
913}
914
915/*
916 * Copy all the Multicast addresses from src to the bonding device dst
917 */
918static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
919 gfp_t gfp_flag)
920{
921 struct dev_mc_list *dmi, *new_dmi;
922
923 for (dmi = mc_list; dmi; dmi = dmi->next) {
924 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
925
926 if (!new_dmi) {
927 /* FIXME: Potential memory leak !!! */
928 return -ENOMEM;
929 }
930
931 new_dmi->next = bond->mc_list;
932 bond->mc_list = new_dmi;
933 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
934 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
935 new_dmi->dmi_users = dmi->dmi_users;
936 new_dmi->dmi_gusers = dmi->dmi_gusers;
937 }
938
939 return 0;
940}
941
942/*
943 * flush all members of flush->mc_list from device dev->mc_list
944 */
945static void bond_mc_list_flush(struct net_device *bond_dev,
946 struct net_device *slave_dev)
947{
948 struct bonding *bond = netdev_priv(bond_dev);
949 struct dev_mc_list *dmi;
950
951 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next)
952 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
953
954 if (bond->params.mode == BOND_MODE_8023AD) {
955 /* del lacpdu mc addr from mc list */
956 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
957
958 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
959 }
960}
961
962/*--------------------------- Active slave change ---------------------------*/
963
964/*
965 * Update the mc list and multicast-related flags for the new and
966 * old active slaves (if any) according to the multicast mode, and
967 * promiscuous flags unconditionally.
968 */
969static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
970 struct slave *old_active)
971{
972 struct dev_mc_list *dmi;
973
974 if (!USES_PRIMARY(bond->params.mode))
975 /* nothing to do - mc list is already up-to-date on
976 * all slaves
977 */
978 return;
979
980 if (old_active) {
981 if (bond->dev->flags & IFF_PROMISC)
982 dev_set_promiscuity(old_active->dev, -1);
983
984 if (bond->dev->flags & IFF_ALLMULTI)
985 dev_set_allmulti(old_active->dev, -1);
986
987 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next)
988 dev_mc_delete(old_active->dev, dmi->dmi_addr,
989 dmi->dmi_addrlen, 0);
990 }
991
992 if (new_active) {
993 /* FIXME: Signal errors upstream. */
994 if (bond->dev->flags & IFF_PROMISC)
995 dev_set_promiscuity(new_active->dev, 1);
996
997 if (bond->dev->flags & IFF_ALLMULTI)
998 dev_set_allmulti(new_active->dev, 1);
999
1000 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next)
1001 dev_mc_add(new_active->dev, dmi->dmi_addr,
1002 dmi->dmi_addrlen, 0);
1003 bond_resend_igmp_join_requests(bond);
1004 }
1005}
1006
1007/*
1008 * bond_do_fail_over_mac
1009 *
1010 * Perform special MAC address swapping for fail_over_mac settings
1011 *
1012 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
1013 */
1014static void bond_do_fail_over_mac(struct bonding *bond,
1015 struct slave *new_active,
1016 struct slave *old_active)
1017 __releases(&bond->curr_slave_lock)
1018 __releases(&bond->lock)
1019 __acquires(&bond->lock)
1020 __acquires(&bond->curr_slave_lock)
1021{
1022 u8 tmp_mac[ETH_ALEN];
1023 struct sockaddr saddr;
1024 int rv;
1025
1026 switch (bond->params.fail_over_mac) {
1027 case BOND_FOM_ACTIVE:
1028 if (new_active)
1029 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
1030 new_active->dev->addr_len);
1031 break;
1032 case BOND_FOM_FOLLOW:
1033 /*
1034 * if new_active && old_active, swap them
1035 * if just old_active, do nothing (going to no active slave)
1036 * if just new_active, set new_active to bond's MAC
1037 */
1038 if (!new_active)
1039 return;
1040
1041 write_unlock_bh(&bond->curr_slave_lock);
1042 read_unlock(&bond->lock);
1043
1044 if (old_active) {
1045 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
1046 memcpy(saddr.sa_data, old_active->dev->dev_addr,
1047 ETH_ALEN);
1048 saddr.sa_family = new_active->dev->type;
1049 } else {
1050 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
1051 saddr.sa_family = bond->dev->type;
1052 }
1053
1054 rv = dev_set_mac_address(new_active->dev, &saddr);
1055 if (rv) {
1056 pr_err("%s: Error %d setting MAC of slave %s\n",
1057 bond->dev->name, -rv, new_active->dev->name);
1058 goto out;
1059 }
1060
1061 if (!old_active)
1062 goto out;
1063
1064 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1065 saddr.sa_family = old_active->dev->type;
1066
1067 rv = dev_set_mac_address(old_active->dev, &saddr);
1068 if (rv)
1069 pr_err("%s: Error %d setting MAC of slave %s\n",
1070 bond->dev->name, -rv, new_active->dev->name);
1071out:
1072 read_lock(&bond->lock);
1073 write_lock_bh(&bond->curr_slave_lock);
1074 break;
1075 default:
1076 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
1077 bond->dev->name, bond->params.fail_over_mac);
1078 break;
1079 }
1080
1081}
1082
1083static bool bond_should_change_active(struct bonding *bond)
1084{
1085 struct slave *prim = bond->primary_slave;
1086 struct slave *curr = bond->curr_active_slave;
1087
1088 if (!prim || !curr || curr->link != BOND_LINK_UP)
1089 return true;
1090 if (bond->force_primary) {
1091 bond->force_primary = false;
1092 return true;
1093 }
1094 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
1095 (prim->speed < curr->speed ||
1096 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
1097 return false;
1098 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
1099 return false;
1100 return true;
1101}
1102
1103/**
1104 * find_best_interface - select the best available slave to be the active one
1105 * @bond: our bonding struct
1106 *
1107 * Warning: Caller must hold curr_slave_lock for writing.
1108 */
1109static struct slave *bond_find_best_slave(struct bonding *bond)
1110{
1111 struct slave *new_active, *old_active;
1112 struct slave *bestslave = NULL;
1113 int mintime = bond->params.updelay;
1114 int i;
1115
1116 new_active = bond->curr_active_slave;
1117
1118 if (!new_active) { /* there were no active slaves left */
1119 if (bond->slave_cnt > 0) /* found one slave */
1120 new_active = bond->first_slave;
1121 else
1122 return NULL; /* still no slave, return NULL */
1123 }
1124
1125 if ((bond->primary_slave) &&
1126 bond->primary_slave->link == BOND_LINK_UP &&
1127 bond_should_change_active(bond)) {
1128 new_active = bond->primary_slave;
1129 }
1130
1131 /* remember where to stop iterating over the slaves */
1132 old_active = new_active;
1133
1134 bond_for_each_slave_from(bond, new_active, i, old_active) {
1135 if (new_active->link == BOND_LINK_UP) {
1136 return new_active;
1137 } else if (new_active->link == BOND_LINK_BACK &&
1138 IS_UP(new_active->dev)) {
1139 /* link up, but waiting for stabilization */
1140 if (new_active->delay < mintime) {
1141 mintime = new_active->delay;
1142 bestslave = new_active;
1143 }
1144 }
1145 }
1146
1147 return bestslave;
1148}
1149
1150/**
1151 * change_active_interface - change the active slave into the specified one
1152 * @bond: our bonding struct
1153 * @new: the new slave to make the active one
1154 *
1155 * Set the new slave to the bond's settings and unset them on the old
1156 * curr_active_slave.
1157 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1158 *
1159 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1160 * because it is apparently the best available slave we have, even though its
1161 * updelay hasn't timed out yet.
1162 *
1163 * If new_active is not NULL, caller must hold bond->lock for read and
1164 * curr_slave_lock for write_bh.
1165 */
1166void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1167{
1168 struct slave *old_active = bond->curr_active_slave;
1169
1170 if (old_active == new_active)
1171 return;
1172
1173 if (new_active) {
1174 new_active->jiffies = jiffies;
1175
1176 if (new_active->link == BOND_LINK_BACK) {
1177 if (USES_PRIMARY(bond->params.mode)) {
1178 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1179 bond->dev->name, new_active->dev->name,
1180 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1181 }
1182
1183 new_active->delay = 0;
1184 new_active->link = BOND_LINK_UP;
1185
1186 if (bond->params.mode == BOND_MODE_8023AD)
1187 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1188
1189 if (bond_is_lb(bond))
1190 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1191 } else {
1192 if (USES_PRIMARY(bond->params.mode)) {
1193 pr_info("%s: making interface %s the new active one.\n",
1194 bond->dev->name, new_active->dev->name);
1195 }
1196 }
1197 }
1198
1199 if (USES_PRIMARY(bond->params.mode))
1200 bond_mc_swap(bond, new_active, old_active);
1201
1202 if (bond_is_lb(bond)) {
1203 bond_alb_handle_active_change(bond, new_active);
1204 if (old_active)
1205 bond_set_slave_inactive_flags(old_active);
1206 if (new_active)
1207 bond_set_slave_active_flags(new_active);
1208 } else {
1209 bond->curr_active_slave = new_active;
1210 }
1211
1212 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1213 if (old_active)
1214 bond_set_slave_inactive_flags(old_active);
1215
1216 if (new_active) {
1217 bond_set_slave_active_flags(new_active);
1218
1219 if (bond->params.fail_over_mac)
1220 bond_do_fail_over_mac(bond, new_active,
1221 old_active);
1222
1223 bond->send_grat_arp = bond->params.num_grat_arp;
1224 bond_send_gratuitous_arp(bond);
1225
1226 bond->send_unsol_na = bond->params.num_unsol_na;
1227 bond_send_unsolicited_na(bond);
1228
1229 write_unlock_bh(&bond->curr_slave_lock);
1230 read_unlock(&bond->lock);
1231
1232 netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1233
1234 read_lock(&bond->lock);
1235 write_lock_bh(&bond->curr_slave_lock);
1236 }
1237 }
1238}
1239
1240/**
1241 * bond_select_active_slave - select a new active slave, if needed
1242 * @bond: our bonding struct
1243 *
1244 * This functions should be called when one of the following occurs:
1245 * - The old curr_active_slave has been released or lost its link.
1246 * - The primary_slave has got its link back.
1247 * - A slave has got its link back and there's no old curr_active_slave.
1248 *
1249 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1250 */
1251void bond_select_active_slave(struct bonding *bond)
1252{
1253 struct slave *best_slave;
1254 int rv;
1255
1256 best_slave = bond_find_best_slave(bond);
1257 if (best_slave != bond->curr_active_slave) {
1258 bond_change_active_slave(bond, best_slave);
1259 rv = bond_set_carrier(bond);
1260 if (!rv)
1261 return;
1262
1263 if (netif_carrier_ok(bond->dev)) {
1264 pr_info("%s: first active interface up!\n",
1265 bond->dev->name);
1266 } else {
1267 pr_info("%s: now running without any active interface !\n",
1268 bond->dev->name);
1269 }
1270 }
1271}
1272
1273/*--------------------------- slave list handling ---------------------------*/
1274
1275/*
1276 * This function attaches the slave to the end of list.
1277 *
1278 * bond->lock held for writing by caller.
1279 */
1280static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1281{
1282 if (bond->first_slave == NULL) { /* attaching the first slave */
1283 new_slave->next = new_slave;
1284 new_slave->prev = new_slave;
1285 bond->first_slave = new_slave;
1286 } else {
1287 new_slave->next = bond->first_slave;
1288 new_slave->prev = bond->first_slave->prev;
1289 new_slave->next->prev = new_slave;
1290 new_slave->prev->next = new_slave;
1291 }
1292
1293 bond->slave_cnt++;
1294}
1295
1296/*
1297 * This function detaches the slave from the list.
1298 * WARNING: no check is made to verify if the slave effectively
1299 * belongs to <bond>.
1300 * Nothing is freed on return, structures are just unchained.
1301 * If any slave pointer in bond was pointing to <slave>,
1302 * it should be changed by the calling function.
1303 *
1304 * bond->lock held for writing by caller.
1305 */
1306static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1307{
1308 if (slave->next)
1309 slave->next->prev = slave->prev;
1310
1311 if (slave->prev)
1312 slave->prev->next = slave->next;
1313
1314 if (bond->first_slave == slave) { /* slave is the first slave */
1315 if (bond->slave_cnt > 1) { /* there are more slave */
1316 bond->first_slave = slave->next;
1317 } else {
1318 bond->first_slave = NULL; /* slave was the last one */
1319 }
1320 }
1321
1322 slave->next = NULL;
1323 slave->prev = NULL;
1324 bond->slave_cnt--;
1325}
1326
1327/*---------------------------------- IOCTL ----------------------------------*/
1328
1329static int bond_sethwaddr(struct net_device *bond_dev,
1330 struct net_device *slave_dev)
1331{
1332 pr_debug("bond_dev=%p\n", bond_dev);
1333 pr_debug("slave_dev=%p\n", slave_dev);
1334 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1335 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1336 return 0;
1337}
1338
1339#define BOND_VLAN_FEATURES \
1340 (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1341 NETIF_F_HW_VLAN_FILTER)
1342
1343/*
1344 * Compute the common dev->feature set available to all slaves. Some
1345 * feature bits are managed elsewhere, so preserve those feature bits
1346 * on the master device.
1347 */
1348static int bond_compute_features(struct bonding *bond)
1349{
1350 struct slave *slave;
1351 struct net_device *bond_dev = bond->dev;
1352 unsigned long features = bond_dev->features;
1353 unsigned long vlan_features = 0;
1354 unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1355 bond_dev->hard_header_len);
1356 int i;
1357
1358 features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1359 features |= NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1360
1361 if (!bond->first_slave)
1362 goto done;
1363
1364 features &= ~NETIF_F_ONE_FOR_ALL;
1365
1366 vlan_features = bond->first_slave->dev->vlan_features;
1367 bond_for_each_slave(bond, slave, i) {
1368 features = netdev_increment_features(features,
1369 slave->dev->features,
1370 NETIF_F_ONE_FOR_ALL);
1371 vlan_features = netdev_increment_features(vlan_features,
1372 slave->dev->vlan_features,
1373 NETIF_F_ONE_FOR_ALL);
1374 if (slave->dev->hard_header_len > max_hard_header_len)
1375 max_hard_header_len = slave->dev->hard_header_len;
1376 }
1377
1378done:
1379 features |= (bond_dev->features & BOND_VLAN_FEATURES);
1380 bond_dev->features = netdev_fix_features(features, NULL);
1381 bond_dev->vlan_features = netdev_fix_features(vlan_features, NULL);
1382 bond_dev->hard_header_len = max_hard_header_len;
1383
1384 return 0;
1385}
1386
1387static void bond_setup_by_slave(struct net_device *bond_dev,
1388 struct net_device *slave_dev)
1389{
1390 struct bonding *bond = netdev_priv(bond_dev);
1391
1392 bond_dev->header_ops = slave_dev->header_ops;
1393
1394 bond_dev->type = slave_dev->type;
1395 bond_dev->hard_header_len = slave_dev->hard_header_len;
1396 bond_dev->addr_len = slave_dev->addr_len;
1397
1398 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1399 slave_dev->addr_len);
1400 bond->setup_by_slave = 1;
1401}
1402
1403/* enslave device <slave> to bond device <master> */
1404int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1405{
1406 struct bonding *bond = netdev_priv(bond_dev);
1407 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1408 struct slave *new_slave = NULL;
1409 struct dev_mc_list *dmi;
1410 struct sockaddr addr;
1411 int link_reporting;
1412 int old_features = bond_dev->features;
1413 int res = 0;
1414
1415 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1416 slave_ops->ndo_do_ioctl == NULL) {
1417 pr_warning("%s: Warning: no link monitoring support for %s\n",
1418 bond_dev->name, slave_dev->name);
1419 }
1420
1421 /* bond must be initialized by bond_open() before enslaving */
1422 if (!(bond_dev->flags & IFF_UP)) {
1423 pr_warning("%s: master_dev is not up in bond_enslave\n",
1424 bond_dev->name);
1425 }
1426
1427 /* already enslaved */
1428 if (slave_dev->flags & IFF_SLAVE) {
1429 pr_debug("Error, Device was already enslaved\n");
1430 return -EBUSY;
1431 }
1432
1433 /* vlan challenged mutual exclusion */
1434 /* no need to lock since we're protected by rtnl_lock */
1435 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1436 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1437 if (!list_empty(&bond->vlan_list)) {
1438 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1439 bond_dev->name, slave_dev->name, bond_dev->name);
1440 return -EPERM;
1441 } else {
1442 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1443 bond_dev->name, slave_dev->name,
1444 slave_dev->name, bond_dev->name);
1445 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1446 }
1447 } else {
1448 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1449 if (bond->slave_cnt == 0) {
1450 /* First slave, and it is not VLAN challenged,
1451 * so remove the block of adding VLANs over the bond.
1452 */
1453 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1454 }
1455 }
1456
1457 /*
1458 * Old ifenslave binaries are no longer supported. These can
1459 * be identified with moderate accuracy by the state of the slave:
1460 * the current ifenslave will set the interface down prior to
1461 * enslaving it; the old ifenslave will not.
1462 */
1463 if ((slave_dev->flags & IFF_UP)) {
1464 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1465 slave_dev->name);
1466 res = -EPERM;
1467 goto err_undo_flags;
1468 }
1469
1470 /* set bonding device ether type by slave - bonding netdevices are
1471 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1472 * there is a need to override some of the type dependent attribs/funcs.
1473 *
1474 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1475 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1476 */
1477 if (bond->slave_cnt == 0) {
1478 if (bond_dev->type != slave_dev->type) {
1479 pr_debug("%s: change device type from %d to %d\n",
1480 bond_dev->name,
1481 bond_dev->type, slave_dev->type);
1482
1483 res = netdev_bonding_change(bond_dev,
1484 NETDEV_PRE_TYPE_CHANGE);
1485 res = notifier_to_errno(res);
1486 if (res) {
1487 pr_err("%s: refused to change device type\n",
1488 bond_dev->name);
1489 res = -EBUSY;
1490 goto err_undo_flags;
1491 }
1492
1493 /* Flush unicast and multicast addresses */
1494 dev_unicast_flush(bond_dev);
1495 dev_addr_discard(bond_dev);
1496
1497 if (slave_dev->type != ARPHRD_ETHER)
1498 bond_setup_by_slave(bond_dev, slave_dev);
1499 else
1500 ether_setup(bond_dev);
1501
1502 netdev_bonding_change(bond_dev,
1503 NETDEV_POST_TYPE_CHANGE);
1504 }
1505 } else if (bond_dev->type != slave_dev->type) {
1506 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1507 slave_dev->name,
1508 slave_dev->type, bond_dev->type);
1509 res = -EINVAL;
1510 goto err_undo_flags;
1511 }
1512
1513 if (slave_ops->ndo_set_mac_address == NULL) {
1514 if (bond->slave_cnt == 0) {
1515 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1516 bond_dev->name);
1517 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1518 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1519 pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active.\n",
1520 bond_dev->name);
1521 res = -EOPNOTSUPP;
1522 goto err_undo_flags;
1523 }
1524 }
1525
1526 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1527 if (!new_slave) {
1528 res = -ENOMEM;
1529 goto err_undo_flags;
1530 }
1531
1532 /* save slave's original flags before calling
1533 * netdev_set_master and dev_open
1534 */
1535 new_slave->original_flags = slave_dev->flags;
1536
1537 /*
1538 * Save slave's original ("permanent") mac address for modes
1539 * that need it, and for restoring it upon release, and then
1540 * set it to the master's address
1541 */
1542 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1543
1544 if (!bond->params.fail_over_mac) {
1545 /*
1546 * Set slave to master's mac address. The application already
1547 * set the master's mac address to that of the first slave
1548 */
1549 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1550 addr.sa_family = slave_dev->type;
1551 res = dev_set_mac_address(slave_dev, &addr);
1552 if (res) {
1553 pr_debug("Error %d calling set_mac_address\n", res);
1554 goto err_free;
1555 }
1556 }
1557
1558 res = netdev_set_master(slave_dev, bond_dev);
1559 if (res) {
1560 pr_debug("Error %d calling netdev_set_master\n", res);
1561 goto err_restore_mac;
1562 }
1563 /* open the slave since the application closed it */
1564 res = dev_open(slave_dev);
1565 if (res) {
1566 pr_debug("Opening slave %s failed\n", slave_dev->name);
1567 goto err_unset_master;
1568 }
1569
1570 new_slave->dev = slave_dev;
1571 slave_dev->priv_flags |= IFF_BONDING;
1572
1573 if (bond_is_lb(bond)) {
1574 /* bond_alb_init_slave() must be called before all other stages since
1575 * it might fail and we do not want to have to undo everything
1576 */
1577 res = bond_alb_init_slave(bond, new_slave);
1578 if (res)
1579 goto err_close;
1580 }
1581
1582 /* If the mode USES_PRIMARY, then the new slave gets the
1583 * master's promisc (and mc) settings only if it becomes the
1584 * curr_active_slave, and that is taken care of later when calling
1585 * bond_change_active()
1586 */
1587 if (!USES_PRIMARY(bond->params.mode)) {
1588 /* set promiscuity level to new slave */
1589 if (bond_dev->flags & IFF_PROMISC) {
1590 res = dev_set_promiscuity(slave_dev, 1);
1591 if (res)
1592 goto err_close;
1593 }
1594
1595 /* set allmulti level to new slave */
1596 if (bond_dev->flags & IFF_ALLMULTI) {
1597 res = dev_set_allmulti(slave_dev, 1);
1598 if (res)
1599 goto err_close;
1600 }
1601
1602 netif_addr_lock_bh(bond_dev);
1603 /* upload master's mc_list to new slave */
1604 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next)
1605 dev_mc_add(slave_dev, dmi->dmi_addr,
1606 dmi->dmi_addrlen, 0);
1607 netif_addr_unlock_bh(bond_dev);
1608 }
1609
1610 if (bond->params.mode == BOND_MODE_8023AD) {
1611 /* add lacpdu mc addr to mc list */
1612 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1613
1614 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1615 }
1616
1617 bond_add_vlans_on_slave(bond, slave_dev);
1618
1619 write_lock_bh(&bond->lock);
1620
1621 bond_attach_slave(bond, new_slave);
1622
1623 new_slave->delay = 0;
1624 new_slave->link_failure_count = 0;
1625
1626 bond_compute_features(bond);
1627
1628 write_unlock_bh(&bond->lock);
1629
1630 read_lock(&bond->lock);
1631
1632 new_slave->last_arp_rx = jiffies;
1633
1634 if (bond->params.miimon && !bond->params.use_carrier) {
1635 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1636
1637 if ((link_reporting == -1) && !bond->params.arp_interval) {
1638 /*
1639 * miimon is set but a bonded network driver
1640 * does not support ETHTOOL/MII and
1641 * arp_interval is not set. Note: if
1642 * use_carrier is enabled, we will never go
1643 * here (because netif_carrier is always
1644 * supported); thus, we don't need to change
1645 * the messages for netif_carrier.
1646 */
1647 pr_warning("%s: Warning: MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details.\n",
1648 bond_dev->name, slave_dev->name);
1649 } else if (link_reporting == -1) {
1650 /* unable get link status using mii/ethtool */
1651 pr_warning("%s: Warning: can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface.\n",
1652 bond_dev->name, slave_dev->name);
1653 }
1654 }
1655
1656 /* check for initial state */
1657 if (!bond->params.miimon ||
1658 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1659 if (bond->params.updelay) {
1660 pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1661 new_slave->link = BOND_LINK_BACK;
1662 new_slave->delay = bond->params.updelay;
1663 } else {
1664 pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1665 new_slave->link = BOND_LINK_UP;
1666 }
1667 new_slave->jiffies = jiffies;
1668 } else {
1669 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1670 new_slave->link = BOND_LINK_DOWN;
1671 }
1672
1673 if (bond_update_speed_duplex(new_slave) &&
1674 (new_slave->link != BOND_LINK_DOWN)) {
1675 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n",
1676 bond_dev->name, new_slave->dev->name);
1677
1678 if (bond->params.mode == BOND_MODE_8023AD) {
1679 pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n",
1680 bond_dev->name);
1681 }
1682 }
1683
1684 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1685 /* if there is a primary slave, remember it */
1686 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1687 bond->primary_slave = new_slave;
1688 bond->force_primary = true;
1689 }
1690 }
1691
1692 write_lock_bh(&bond->curr_slave_lock);
1693
1694 switch (bond->params.mode) {
1695 case BOND_MODE_ACTIVEBACKUP:
1696 bond_set_slave_inactive_flags(new_slave);
1697 bond_select_active_slave(bond);
1698 break;
1699 case BOND_MODE_8023AD:
1700 /* in 802.3ad mode, the internal mechanism
1701 * will activate the slaves in the selected
1702 * aggregator
1703 */
1704 bond_set_slave_inactive_flags(new_slave);
1705 /* if this is the first slave */
1706 if (bond->slave_cnt == 1) {
1707 SLAVE_AD_INFO(new_slave).id = 1;
1708 /* Initialize AD with the number of times that the AD timer is called in 1 second
1709 * can be called only after the mac address of the bond is set
1710 */
1711 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1712 bond->params.lacp_fast);
1713 } else {
1714 SLAVE_AD_INFO(new_slave).id =
1715 SLAVE_AD_INFO(new_slave->prev).id + 1;
1716 }
1717
1718 bond_3ad_bind_slave(new_slave);
1719 break;
1720 case BOND_MODE_TLB:
1721 case BOND_MODE_ALB:
1722 new_slave->state = BOND_STATE_ACTIVE;
1723 bond_set_slave_inactive_flags(new_slave);
1724 bond_select_active_slave(bond);
1725 break;
1726 default:
1727 pr_debug("This slave is always active in trunk mode\n");
1728
1729 /* always active in trunk mode */
1730 new_slave->state = BOND_STATE_ACTIVE;
1731
1732 /* In trunking mode there is little meaning to curr_active_slave
1733 * anyway (it holds no special properties of the bond device),
1734 * so we can change it without calling change_active_interface()
1735 */
1736 if (!bond->curr_active_slave)
1737 bond->curr_active_slave = new_slave;
1738
1739 break;
1740 } /* switch(bond_mode) */
1741
1742 write_unlock_bh(&bond->curr_slave_lock);
1743
1744 bond_set_carrier(bond);
1745
1746 read_unlock(&bond->lock);
1747
1748 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1749 if (res)
1750 goto err_close;
1751
1752 pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1753 bond_dev->name, slave_dev->name,
1754 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1755 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1756
1757 /* enslave is successful */
1758 return 0;
1759
1760/* Undo stages on error */
1761err_close:
1762 dev_close(slave_dev);
1763
1764err_unset_master:
1765 netdev_set_master(slave_dev, NULL);
1766
1767err_restore_mac:
1768 if (!bond->params.fail_over_mac) {
1769 /* XXX TODO - fom follow mode needs to change master's
1770 * MAC if this slave's MAC is in use by the bond, or at
1771 * least print a warning.
1772 */
1773 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1774 addr.sa_family = slave_dev->type;
1775 dev_set_mac_address(slave_dev, &addr);
1776 }
1777
1778err_free:
1779 kfree(new_slave);
1780
1781err_undo_flags:
1782 bond_dev->features = old_features;
1783
1784 return res;
1785}
1786
1787/*
1788 * Try to release the slave device <slave> from the bond device <master>
1789 * It is legal to access curr_active_slave without a lock because all the function
1790 * is write-locked.
1791 *
1792 * The rules for slave state should be:
1793 * for Active/Backup:
1794 * Active stays on all backups go down
1795 * for Bonded connections:
1796 * The first up interface should be left on and all others downed.
1797 */
1798int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1799{
1800 struct bonding *bond = netdev_priv(bond_dev);
1801 struct slave *slave, *oldcurrent;
1802 struct sockaddr addr;
1803
1804 /* slave is not a slave or master is not master of this slave */
1805 if (!(slave_dev->flags & IFF_SLAVE) ||
1806 (slave_dev->master != bond_dev)) {
1807 pr_err("%s: Error: cannot release %s.\n",
1808 bond_dev->name, slave_dev->name);
1809 return -EINVAL;
1810 }
1811
1812 write_lock_bh(&bond->lock);
1813
1814 slave = bond_get_slave_by_dev(bond, slave_dev);
1815 if (!slave) {
1816 /* not a slave of this bond */
1817 pr_info("%s: %s not enslaved\n",
1818 bond_dev->name, slave_dev->name);
1819 write_unlock_bh(&bond->lock);
1820 return -EINVAL;
1821 }
1822
1823 if (!bond->params.fail_over_mac) {
1824 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1825 bond->slave_cnt > 1)
1826 pr_warning("%s: Warning: the permanent HWaddr of %s - %pM - is still in use by %s. Set the HWaddr of %s to a different address to avoid conflicts.\n",
1827 bond_dev->name, slave_dev->name,
1828 slave->perm_hwaddr,
1829 bond_dev->name, slave_dev->name);
1830 }
1831
1832 /* Inform AD package of unbinding of slave. */
1833 if (bond->params.mode == BOND_MODE_8023AD) {
1834 /* must be called before the slave is
1835 * detached from the list
1836 */
1837 bond_3ad_unbind_slave(slave);
1838 }
1839
1840 pr_info("%s: releasing %s interface %s\n",
1841 bond_dev->name,
1842 (slave->state == BOND_STATE_ACTIVE) ? "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("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1901 bond_dev->name, bond_dev->name);
1902 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1903 bond_dev->name);
1904 }
1905 } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1906 !bond_has_challenged_slaves(bond)) {
1907 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1908 bond_dev->name, slave_dev->name, bond_dev->name);
1909 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1910 }
1911
1912 write_unlock_bh(&bond->lock);
1913
1914 /* must do this from outside any spinlocks */
1915 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1916
1917 bond_del_vlans_from_slave(bond, slave_dev);
1918
1919 /* If the mode USES_PRIMARY, then we should only remove its
1920 * promisc and mc settings if it was the curr_active_slave, but that was
1921 * already taken care of above when we detached the slave
1922 */
1923 if (!USES_PRIMARY(bond->params.mode)) {
1924 /* unset promiscuity level from slave */
1925 if (bond_dev->flags & IFF_PROMISC)
1926 dev_set_promiscuity(slave_dev, -1);
1927
1928 /* unset allmulti level from slave */
1929 if (bond_dev->flags & IFF_ALLMULTI)
1930 dev_set_allmulti(slave_dev, -1);
1931
1932 /* flush master's mc_list from slave */
1933 netif_addr_lock_bh(bond_dev);
1934 bond_mc_list_flush(bond_dev, slave_dev);
1935 netif_addr_unlock_bh(bond_dev);
1936 }
1937
1938 netdev_set_master(slave_dev, NULL);
1939
1940 /* close slave before restoring its mac address */
1941 dev_close(slave_dev);
1942
1943 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1944 /* restore original ("permanent") mac address */
1945 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1946 addr.sa_family = slave_dev->type;
1947 dev_set_mac_address(slave_dev, &addr);
1948 }
1949
1950 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1951 IFF_SLAVE_INACTIVE | IFF_BONDING |
1952 IFF_SLAVE_NEEDARP);
1953
1954 kfree(slave);
1955
1956 return 0; /* deletion OK */
1957}
1958
1959/*
1960* First release a slave and than destroy the bond if no more slaves are left.
1961* Must be under rtnl_lock when this function is called.
1962*/
1963int bond_release_and_destroy(struct net_device *bond_dev,
1964 struct net_device *slave_dev)
1965{
1966 struct bonding *bond = netdev_priv(bond_dev);
1967 int ret;
1968
1969 ret = bond_release(bond_dev, slave_dev);
1970 if ((ret == 0) && (bond->slave_cnt == 0)) {
1971 pr_info("%s: destroying bond %s.\n",
1972 bond_dev->name, bond_dev->name);
1973 unregister_netdevice(bond_dev);
1974 }
1975 return ret;
1976}
1977
1978/*
1979 * This function releases all slaves.
1980 */
1981static int bond_release_all(struct net_device *bond_dev)
1982{
1983 struct bonding *bond = netdev_priv(bond_dev);
1984 struct slave *slave;
1985 struct net_device *slave_dev;
1986 struct sockaddr addr;
1987
1988 write_lock_bh(&bond->lock);
1989
1990 netif_carrier_off(bond_dev);
1991
1992 if (bond->slave_cnt == 0)
1993 goto out;
1994
1995 bond->current_arp_slave = NULL;
1996 bond->primary_slave = NULL;
1997 bond_change_active_slave(bond, NULL);
1998
1999 while ((slave = bond->first_slave) != NULL) {
2000 /* Inform AD package of unbinding of slave
2001 * before slave is detached from the list.
2002 */
2003 if (bond->params.mode == BOND_MODE_8023AD)
2004 bond_3ad_unbind_slave(slave);
2005
2006 slave_dev = slave->dev;
2007 bond_detach_slave(bond, slave);
2008
2009 /* now that the slave is detached, unlock and perform
2010 * all the undo steps that should not be called from
2011 * within a lock.
2012 */
2013 write_unlock_bh(&bond->lock);
2014
2015 if (bond_is_lb(bond)) {
2016 /* must be called only after the slave
2017 * has been detached from the list
2018 */
2019 bond_alb_deinit_slave(bond, slave);
2020 }
2021
2022 bond_compute_features(bond);
2023
2024 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2025 bond_del_vlans_from_slave(bond, slave_dev);
2026
2027 /* If the mode USES_PRIMARY, then we should only remove its
2028 * promisc and mc settings if it was the curr_active_slave, but that was
2029 * already taken care of above when we detached the slave
2030 */
2031 if (!USES_PRIMARY(bond->params.mode)) {
2032 /* unset promiscuity level from slave */
2033 if (bond_dev->flags & IFF_PROMISC)
2034 dev_set_promiscuity(slave_dev, -1);
2035
2036 /* unset allmulti level from slave */
2037 if (bond_dev->flags & IFF_ALLMULTI)
2038 dev_set_allmulti(slave_dev, -1);
2039
2040 /* flush master's mc_list from slave */
2041 netif_addr_lock_bh(bond_dev);
2042 bond_mc_list_flush(bond_dev, slave_dev);
2043 netif_addr_unlock_bh(bond_dev);
2044 }
2045
2046 netdev_set_master(slave_dev, NULL);
2047
2048 /* close slave before restoring its mac address */
2049 dev_close(slave_dev);
2050
2051 if (!bond->params.fail_over_mac) {
2052 /* restore original ("permanent") mac address*/
2053 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2054 addr.sa_family = slave_dev->type;
2055 dev_set_mac_address(slave_dev, &addr);
2056 }
2057
2058 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2059 IFF_SLAVE_INACTIVE);
2060
2061 kfree(slave);
2062
2063 /* re-acquire the lock before getting the next slave */
2064 write_lock_bh(&bond->lock);
2065 }
2066
2067 /* zero the mac address of the master so it will be
2068 * set by the application to the mac address of the
2069 * first slave
2070 */
2071 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2072
2073 if (list_empty(&bond->vlan_list))
2074 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2075 else {
2076 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2077 bond_dev->name, bond_dev->name);
2078 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2079 bond_dev->name);
2080 }
2081
2082 pr_info("%s: released all slaves\n", bond_dev->name);
2083
2084out:
2085 write_unlock_bh(&bond->lock);
2086
2087 return 0;
2088}
2089
2090/*
2091 * This function changes the active slave to slave <slave_dev>.
2092 * It returns -EINVAL in the following cases.
2093 * - <slave_dev> is not found in the list.
2094 * - There is not active slave now.
2095 * - <slave_dev> is already active.
2096 * - The link state of <slave_dev> is not BOND_LINK_UP.
2097 * - <slave_dev> is not running.
2098 * In these cases, this function does nothing.
2099 * In the other cases, current_slave pointer is changed and 0 is returned.
2100 */
2101static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2102{
2103 struct bonding *bond = netdev_priv(bond_dev);
2104 struct slave *old_active = NULL;
2105 struct slave *new_active = NULL;
2106 int res = 0;
2107
2108 if (!USES_PRIMARY(bond->params.mode))
2109 return -EINVAL;
2110
2111 /* Verify that master_dev is indeed the master of slave_dev */
2112 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2113 return -EINVAL;
2114
2115 read_lock(&bond->lock);
2116
2117 read_lock(&bond->curr_slave_lock);
2118 old_active = bond->curr_active_slave;
2119 read_unlock(&bond->curr_slave_lock);
2120
2121 new_active = bond_get_slave_by_dev(bond, slave_dev);
2122
2123 /*
2124 * Changing to the current active: do nothing; return success.
2125 */
2126 if (new_active && (new_active == old_active)) {
2127 read_unlock(&bond->lock);
2128 return 0;
2129 }
2130
2131 if ((new_active) &&
2132 (old_active) &&
2133 (new_active->link == BOND_LINK_UP) &&
2134 IS_UP(new_active->dev)) {
2135 write_lock_bh(&bond->curr_slave_lock);
2136 bond_change_active_slave(bond, new_active);
2137 write_unlock_bh(&bond->curr_slave_lock);
2138 } else
2139 res = -EINVAL;
2140
2141 read_unlock(&bond->lock);
2142
2143 return res;
2144}
2145
2146static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2147{
2148 struct bonding *bond = netdev_priv(bond_dev);
2149
2150 info->bond_mode = bond->params.mode;
2151 info->miimon = bond->params.miimon;
2152
2153 read_lock(&bond->lock);
2154 info->num_slaves = bond->slave_cnt;
2155 read_unlock(&bond->lock);
2156
2157 return 0;
2158}
2159
2160static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2161{
2162 struct bonding *bond = netdev_priv(bond_dev);
2163 struct slave *slave;
2164 int i, res = -ENODEV;
2165
2166 read_lock(&bond->lock);
2167
2168 bond_for_each_slave(bond, slave, i) {
2169 if (i == (int)info->slave_id) {
2170 res = 0;
2171 strcpy(info->slave_name, slave->dev->name);
2172 info->link = slave->link;
2173 info->state = slave->state;
2174 info->link_failure_count = slave->link_failure_count;
2175 break;
2176 }
2177 }
2178
2179 read_unlock(&bond->lock);
2180
2181 return res;
2182}
2183
2184/*-------------------------------- Monitoring -------------------------------*/
2185
2186
2187static int bond_miimon_inspect(struct bonding *bond)
2188{
2189 struct slave *slave;
2190 int i, link_state, commit = 0;
2191 bool ignore_updelay;
2192
2193 ignore_updelay = !bond->curr_active_slave ? true : false;
2194
2195 bond_for_each_slave(bond, slave, i) {
2196 slave->new_link = BOND_LINK_NOCHANGE;
2197
2198 link_state = bond_check_dev_link(bond, slave->dev, 0);
2199
2200 switch (slave->link) {
2201 case BOND_LINK_UP:
2202 if (link_state)
2203 continue;
2204
2205 slave->link = BOND_LINK_FAIL;
2206 slave->delay = bond->params.downdelay;
2207 if (slave->delay) {
2208 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2209 bond->dev->name,
2210 (bond->params.mode ==
2211 BOND_MODE_ACTIVEBACKUP) ?
2212 ((slave->state == BOND_STATE_ACTIVE) ?
2213 "active " : "backup ") : "",
2214 slave->dev->name,
2215 bond->params.downdelay * bond->params.miimon);
2216 }
2217 /*FALLTHRU*/
2218 case BOND_LINK_FAIL:
2219 if (link_state) {
2220 /*
2221 * recovered before downdelay expired
2222 */
2223 slave->link = BOND_LINK_UP;
2224 slave->jiffies = jiffies;
2225 pr_info("%s: link status up again after %d ms for interface %s.\n",
2226 bond->dev->name,
2227 (bond->params.downdelay - slave->delay) *
2228 bond->params.miimon,
2229 slave->dev->name);
2230 continue;
2231 }
2232
2233 if (slave->delay <= 0) {
2234 slave->new_link = BOND_LINK_DOWN;
2235 commit++;
2236 continue;
2237 }
2238
2239 slave->delay--;
2240 break;
2241
2242 case BOND_LINK_DOWN:
2243 if (!link_state)
2244 continue;
2245
2246 slave->link = BOND_LINK_BACK;
2247 slave->delay = bond->params.updelay;
2248
2249 if (slave->delay) {
2250 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2251 bond->dev->name, slave->dev->name,
2252 ignore_updelay ? 0 :
2253 bond->params.updelay *
2254 bond->params.miimon);
2255 }
2256 /*FALLTHRU*/
2257 case BOND_LINK_BACK:
2258 if (!link_state) {
2259 slave->link = BOND_LINK_DOWN;
2260 pr_info("%s: link status down again after %d ms for interface %s.\n",
2261 bond->dev->name,
2262 (bond->params.updelay - slave->delay) *
2263 bond->params.miimon,
2264 slave->dev->name);
2265
2266 continue;
2267 }
2268
2269 if (ignore_updelay)
2270 slave->delay = 0;
2271
2272 if (slave->delay <= 0) {
2273 slave->new_link = BOND_LINK_UP;
2274 commit++;
2275 ignore_updelay = false;
2276 continue;
2277 }
2278
2279 slave->delay--;
2280 break;
2281 }
2282 }
2283
2284 return commit;
2285}
2286
2287static void bond_miimon_commit(struct bonding *bond)
2288{
2289 struct slave *slave;
2290 int i;
2291
2292 bond_for_each_slave(bond, slave, i) {
2293 switch (slave->new_link) {
2294 case BOND_LINK_NOCHANGE:
2295 continue;
2296
2297 case BOND_LINK_UP:
2298 slave->link = BOND_LINK_UP;
2299 slave->jiffies = jiffies;
2300
2301 if (bond->params.mode == BOND_MODE_8023AD) {
2302 /* prevent it from being the active one */
2303 slave->state = BOND_STATE_BACKUP;
2304 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2305 /* make it immediately active */
2306 slave->state = BOND_STATE_ACTIVE;
2307 } else if (slave != bond->primary_slave) {
2308 /* prevent it from being the active one */
2309 slave->state = BOND_STATE_BACKUP;
2310 }
2311
2312 pr_info("%s: link status definitely up for interface %s.\n",
2313 bond->dev->name, slave->dev->name);
2314
2315 /* notify ad that the link status has changed */
2316 if (bond->params.mode == BOND_MODE_8023AD)
2317 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2318
2319 if (bond_is_lb(bond))
2320 bond_alb_handle_link_change(bond, slave,
2321 BOND_LINK_UP);
2322
2323 if (!bond->curr_active_slave ||
2324 (slave == bond->primary_slave))
2325 goto do_failover;
2326
2327 continue;
2328
2329 case BOND_LINK_DOWN:
2330 if (slave->link_failure_count < UINT_MAX)
2331 slave->link_failure_count++;
2332
2333 slave->link = BOND_LINK_DOWN;
2334
2335 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2336 bond->params.mode == BOND_MODE_8023AD)
2337 bond_set_slave_inactive_flags(slave);
2338
2339 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2340 bond->dev->name, slave->dev->name);
2341
2342 if (bond->params.mode == BOND_MODE_8023AD)
2343 bond_3ad_handle_link_change(slave,
2344 BOND_LINK_DOWN);
2345
2346 if (bond_is_lb(bond))
2347 bond_alb_handle_link_change(bond, slave,
2348 BOND_LINK_DOWN);
2349
2350 if (slave == bond->curr_active_slave)
2351 goto do_failover;
2352
2353 continue;
2354
2355 default:
2356 pr_err("%s: invalid new link %d on slave %s\n",
2357 bond->dev->name, slave->new_link,
2358 slave->dev->name);
2359 slave->new_link = BOND_LINK_NOCHANGE;
2360
2361 continue;
2362 }
2363
2364do_failover:
2365 ASSERT_RTNL();
2366 write_lock_bh(&bond->curr_slave_lock);
2367 bond_select_active_slave(bond);
2368 write_unlock_bh(&bond->curr_slave_lock);
2369 }
2370
2371 bond_set_carrier(bond);
2372}
2373
2374/*
2375 * bond_mii_monitor
2376 *
2377 * Really a wrapper that splits the mii monitor into two phases: an
2378 * inspection, then (if inspection indicates something needs to be done)
2379 * an acquisition of appropriate locks followed by a commit phase to
2380 * implement whatever link state changes are indicated.
2381 */
2382void bond_mii_monitor(struct work_struct *work)
2383{
2384 struct bonding *bond = container_of(work, struct bonding,
2385 mii_work.work);
2386
2387 read_lock(&bond->lock);
2388 if (bond->kill_timers)
2389 goto out;
2390
2391 if (bond->slave_cnt == 0)
2392 goto re_arm;
2393
2394 if (bond->send_grat_arp) {
2395 read_lock(&bond->curr_slave_lock);
2396 bond_send_gratuitous_arp(bond);
2397 read_unlock(&bond->curr_slave_lock);
2398 }
2399
2400 if (bond->send_unsol_na) {
2401 read_lock(&bond->curr_slave_lock);
2402 bond_send_unsolicited_na(bond);
2403 read_unlock(&bond->curr_slave_lock);
2404 }
2405
2406 if (bond_miimon_inspect(bond)) {
2407 read_unlock(&bond->lock);
2408 rtnl_lock();
2409 read_lock(&bond->lock);
2410
2411 bond_miimon_commit(bond);
2412
2413 read_unlock(&bond->lock);
2414 rtnl_unlock(); /* might sleep, hold no other locks */
2415 read_lock(&bond->lock);
2416 }
2417
2418re_arm:
2419 if (bond->params.miimon)
2420 queue_delayed_work(bond->wq, &bond->mii_work,
2421 msecs_to_jiffies(bond->params.miimon));
2422out:
2423 read_unlock(&bond->lock);
2424}
2425
2426static __be32 bond_glean_dev_ip(struct net_device *dev)
2427{
2428 struct in_device *idev;
2429 struct in_ifaddr *ifa;
2430 __be32 addr = 0;
2431
2432 if (!dev)
2433 return 0;
2434
2435 rcu_read_lock();
2436 idev = __in_dev_get_rcu(dev);
2437 if (!idev)
2438 goto out;
2439
2440 ifa = idev->ifa_list;
2441 if (!ifa)
2442 goto out;
2443
2444 addr = ifa->ifa_local;
2445out:
2446 rcu_read_unlock();
2447 return addr;
2448}
2449
2450static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2451{
2452 struct vlan_entry *vlan;
2453
2454 if (ip == bond->master_ip)
2455 return 1;
2456
2457 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2458 if (ip == vlan->vlan_ip)
2459 return 1;
2460 }
2461
2462 return 0;
2463}
2464
2465/*
2466 * We go to the (large) trouble of VLAN tagging ARP frames because
2467 * switches in VLAN mode (especially if ports are configured as
2468 * "native" to a VLAN) might not pass non-tagged frames.
2469 */
2470static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2471{
2472 struct sk_buff *skb;
2473
2474 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2475 slave_dev->name, dest_ip, src_ip, vlan_id);
2476
2477 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2478 NULL, slave_dev->dev_addr, NULL);
2479
2480 if (!skb) {
2481 pr_err("ARP packet allocation failed\n");
2482 return;
2483 }
2484 if (vlan_id) {
2485 skb = vlan_put_tag(skb, vlan_id);
2486 if (!skb) {
2487 pr_err("failed to insert VLAN tag\n");
2488 return;
2489 }
2490 }
2491 arp_xmit(skb);
2492}
2493
2494
2495static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2496{
2497 int i, vlan_id, rv;
2498 __be32 *targets = bond->params.arp_targets;
2499 struct vlan_entry *vlan;
2500 struct net_device *vlan_dev;
2501 struct flowi fl;
2502 struct rtable *rt;
2503
2504 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2505 if (!targets[i])
2506 break;
2507 pr_debug("basa: target %x\n", targets[i]);
2508 if (list_empty(&bond->vlan_list)) {
2509 pr_debug("basa: empty vlan: arp_send\n");
2510 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2511 bond->master_ip, 0);
2512 continue;
2513 }
2514
2515 /*
2516 * If VLANs are configured, we do a route lookup to
2517 * determine which VLAN interface would be used, so we
2518 * can tag the ARP with the proper VLAN tag.
2519 */
2520 memset(&fl, 0, sizeof(fl));
2521 fl.fl4_dst = targets[i];
2522 fl.fl4_tos = RTO_ONLINK;
2523
2524 rv = ip_route_output_key(dev_net(bond->dev), &rt, &fl);
2525 if (rv) {
2526 if (net_ratelimit()) {
2527 pr_warning("%s: no route to arp_ip_target %pI4\n",
2528 bond->dev->name, &fl.fl4_dst);
2529 }
2530 continue;
2531 }
2532
2533 /*
2534 * This target is not on a VLAN
2535 */
2536 if (rt->u.dst.dev == bond->dev) {
2537 ip_rt_put(rt);
2538 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2539 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2540 bond->master_ip, 0);
2541 continue;
2542 }
2543
2544 vlan_id = 0;
2545 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2546 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2547 if (vlan_dev == rt->u.dst.dev) {
2548 vlan_id = vlan->vlan_id;
2549 pr_debug("basa: vlan match on %s %d\n",
2550 vlan_dev->name, vlan_id);
2551 break;
2552 }
2553 }
2554
2555 if (vlan_id) {
2556 ip_rt_put(rt);
2557 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2558 vlan->vlan_ip, vlan_id);
2559 continue;
2560 }
2561
2562 if (net_ratelimit()) {
2563 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2564 bond->dev->name, &fl.fl4_dst,
2565 rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2566 }
2567 ip_rt_put(rt);
2568 }
2569}
2570
2571/*
2572 * Kick out a gratuitous ARP for an IP on the bonding master plus one
2573 * for each VLAN above us.
2574 *
2575 * Caller must hold curr_slave_lock for read or better
2576 */
2577static void bond_send_gratuitous_arp(struct bonding *bond)
2578{
2579 struct slave *slave = bond->curr_active_slave;
2580 struct vlan_entry *vlan;
2581 struct net_device *vlan_dev;
2582
2583 pr_debug("bond_send_grat_arp: bond %s slave %s\n",
2584 bond->dev->name, slave ? slave->dev->name : "NULL");
2585
2586 if (!slave || !bond->send_grat_arp ||
2587 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2588 return;
2589
2590 bond->send_grat_arp--;
2591
2592 if (bond->master_ip) {
2593 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2594 bond->master_ip, 0);
2595 }
2596
2597 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2598 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2599 if (vlan->vlan_ip) {
2600 bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2601 vlan->vlan_ip, vlan->vlan_id);
2602 }
2603 }
2604}
2605
2606static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2607{
2608 int i;
2609 __be32 *targets = bond->params.arp_targets;
2610
2611 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2612 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2613 &sip, &tip, i, &targets[i],
2614 bond_has_this_ip(bond, tip));
2615 if (sip == targets[i]) {
2616 if (bond_has_this_ip(bond, tip))
2617 slave->last_arp_rx = jiffies;
2618 return;
2619 }
2620 }
2621}
2622
2623static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2624{
2625 struct arphdr *arp;
2626 struct slave *slave;
2627 struct bonding *bond;
2628 unsigned char *arp_ptr;
2629 __be32 sip, tip;
2630
2631 if (dev->priv_flags & IFF_802_1Q_VLAN) {
2632 /*
2633 * When using VLANS and bonding, dev and oriv_dev may be
2634 * incorrect if the physical interface supports VLAN
2635 * acceleration. With this change ARP validation now
2636 * works for hosts only reachable on the VLAN interface.
2637 */
2638 dev = vlan_dev_real_dev(dev);
2639 orig_dev = dev_get_by_index_rcu(dev_net(skb->dev),skb->skb_iif);
2640 }
2641
2642 if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2643 goto out;
2644
2645 bond = netdev_priv(dev);
2646 read_lock(&bond->lock);
2647
2648 pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2649 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2650 orig_dev ? orig_dev->name : "NULL");
2651
2652 slave = bond_get_slave_by_dev(bond, orig_dev);
2653 if (!slave || !slave_do_arp_validate(bond, slave))
2654 goto out_unlock;
2655
2656 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2657 goto out_unlock;
2658
2659 arp = arp_hdr(skb);
2660 if (arp->ar_hln != dev->addr_len ||
2661 skb->pkt_type == PACKET_OTHERHOST ||
2662 skb->pkt_type == PACKET_LOOPBACK ||
2663 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2664 arp->ar_pro != htons(ETH_P_IP) ||
2665 arp->ar_pln != 4)
2666 goto out_unlock;
2667
2668 arp_ptr = (unsigned char *)(arp + 1);
2669 arp_ptr += dev->addr_len;
2670 memcpy(&sip, arp_ptr, 4);
2671 arp_ptr += 4 + dev->addr_len;
2672 memcpy(&tip, arp_ptr, 4);
2673
2674 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2675 bond->dev->name, slave->dev->name, slave->state,
2676 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2677 &sip, &tip);
2678
2679 /*
2680 * Backup slaves won't see the ARP reply, but do come through
2681 * here for each ARP probe (so we swap the sip/tip to validate
2682 * the probe). In a "redundant switch, common router" type of
2683 * configuration, the ARP probe will (hopefully) travel from
2684 * the active, through one switch, the router, then the other
2685 * switch before reaching the backup.
2686 */
2687 if (slave->state == BOND_STATE_ACTIVE)
2688 bond_validate_arp(bond, slave, sip, tip);
2689 else
2690 bond_validate_arp(bond, slave, tip, sip);
2691
2692out_unlock:
2693 read_unlock(&bond->lock);
2694out:
2695 dev_kfree_skb(skb);
2696 return NET_RX_SUCCESS;
2697}
2698
2699/*
2700 * this function is called regularly to monitor each slave's link
2701 * ensuring that traffic is being sent and received when arp monitoring
2702 * is used in load-balancing mode. if the adapter has been dormant, then an
2703 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2704 * arp monitoring in active backup mode.
2705 */
2706void bond_loadbalance_arp_mon(struct work_struct *work)
2707{
2708 struct bonding *bond = container_of(work, struct bonding,
2709 arp_work.work);
2710 struct slave *slave, *oldcurrent;
2711 int do_failover = 0;
2712 int delta_in_ticks;
2713 int i;
2714
2715 read_lock(&bond->lock);
2716
2717 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2718
2719 if (bond->kill_timers)
2720 goto out;
2721
2722 if (bond->slave_cnt == 0)
2723 goto re_arm;
2724
2725 read_lock(&bond->curr_slave_lock);
2726 oldcurrent = bond->curr_active_slave;
2727 read_unlock(&bond->curr_slave_lock);
2728
2729 /* see if any of the previous devices are up now (i.e. they have
2730 * xmt and rcv traffic). the curr_active_slave does not come into
2731 * the picture unless it is null. also, slave->jiffies is not needed
2732 * here because we send an arp on each slave and give a slave as
2733 * long as it needs to get the tx/rx within the delta.
2734 * TODO: what about up/down delay in arp mode? it wasn't here before
2735 * so it can wait
2736 */
2737 bond_for_each_slave(bond, slave, i) {
2738 if (slave->link != BOND_LINK_UP) {
2739 if (time_before_eq(jiffies, dev_trans_start(slave->dev) + delta_in_ticks) &&
2740 time_before_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
2741
2742 slave->link = BOND_LINK_UP;
2743 slave->state = BOND_STATE_ACTIVE;
2744
2745 /* primary_slave has no meaning in round-robin
2746 * mode. the window of a slave being up and
2747 * curr_active_slave being null after enslaving
2748 * is closed.
2749 */
2750 if (!oldcurrent) {
2751 pr_info("%s: link status definitely up for interface %s, ",
2752 bond->dev->name,
2753 slave->dev->name);
2754 do_failover = 1;
2755 } else {
2756 pr_info("%s: interface %s is now up\n",
2757 bond->dev->name,
2758 slave->dev->name);
2759 }
2760 }
2761 } else {
2762 /* slave->link == BOND_LINK_UP */
2763
2764 /* not all switches will respond to an arp request
2765 * when the source ip is 0, so don't take the link down
2766 * if we don't know our ip yet
2767 */
2768 if (time_after_eq(jiffies, dev_trans_start(slave->dev) + 2*delta_in_ticks) ||
2769 (time_after_eq(jiffies, slave->dev->last_rx + 2*delta_in_ticks))) {
2770
2771 slave->link = BOND_LINK_DOWN;
2772 slave->state = BOND_STATE_BACKUP;
2773
2774 if (slave->link_failure_count < UINT_MAX)
2775 slave->link_failure_count++;
2776
2777 pr_info("%s: interface %s is now down.\n",
2778 bond->dev->name,
2779 slave->dev->name);
2780
2781 if (slave == oldcurrent)
2782 do_failover = 1;
2783 }
2784 }
2785
2786 /* note: if switch is in round-robin mode, all links
2787 * must tx arp to ensure all links rx an arp - otherwise
2788 * links may oscillate or not come up at all; if switch is
2789 * in something like xor mode, there is nothing we can
2790 * do - all replies will be rx'ed on same link causing slaves
2791 * to be unstable during low/no traffic periods
2792 */
2793 if (IS_UP(slave->dev))
2794 bond_arp_send_all(bond, slave);
2795 }
2796
2797 if (do_failover) {
2798 write_lock_bh(&bond->curr_slave_lock);
2799
2800 bond_select_active_slave(bond);
2801
2802 write_unlock_bh(&bond->curr_slave_lock);
2803 }
2804
2805re_arm:
2806 if (bond->params.arp_interval)
2807 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2808out:
2809 read_unlock(&bond->lock);
2810}
2811
2812/*
2813 * Called to inspect slaves for active-backup mode ARP monitor link state
2814 * changes. Sets new_link in slaves to specify what action should take
2815 * place for the slave. Returns 0 if no changes are found, >0 if changes
2816 * to link states must be committed.
2817 *
2818 * Called with bond->lock held for read.
2819 */
2820static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2821{
2822 struct slave *slave;
2823 int i, commit = 0;
2824
2825 bond_for_each_slave(bond, slave, i) {
2826 slave->new_link = BOND_LINK_NOCHANGE;
2827
2828 if (slave->link != BOND_LINK_UP) {
2829 if (time_before_eq(jiffies, slave_last_rx(bond, slave) +
2830 delta_in_ticks)) {
2831 slave->new_link = BOND_LINK_UP;
2832 commit++;
2833 }
2834
2835 continue;
2836 }
2837
2838 /*
2839 * Give slaves 2*delta after being enslaved or made
2840 * active. This avoids bouncing, as the last receive
2841 * times need a full ARP monitor cycle to be updated.
2842 */
2843 if (!time_after_eq(jiffies, slave->jiffies +
2844 2 * delta_in_ticks))
2845 continue;
2846
2847 /*
2848 * Backup slave is down if:
2849 * - No current_arp_slave AND
2850 * - more than 3*delta since last receive AND
2851 * - the bond has an IP address
2852 *
2853 * Note: a non-null current_arp_slave indicates
2854 * the curr_active_slave went down and we are
2855 * searching for a new one; under this condition
2856 * we only take the curr_active_slave down - this
2857 * gives each slave a chance to tx/rx traffic
2858 * before being taken out
2859 */
2860 if (slave->state == BOND_STATE_BACKUP &&
2861 !bond->current_arp_slave &&
2862 time_after(jiffies, slave_last_rx(bond, slave) +
2863 3 * delta_in_ticks)) {
2864 slave->new_link = BOND_LINK_DOWN;
2865 commit++;
2866 }
2867
2868 /*
2869 * Active slave is down if:
2870 * - more than 2*delta since transmitting OR
2871 * - (more than 2*delta since receive AND
2872 * the bond has an IP address)
2873 */
2874 if ((slave->state == BOND_STATE_ACTIVE) &&
2875 (time_after_eq(jiffies, dev_trans_start(slave->dev) +
2876 2 * delta_in_ticks) ||
2877 (time_after_eq(jiffies, slave_last_rx(bond, slave)
2878 + 2 * delta_in_ticks)))) {
2879 slave->new_link = BOND_LINK_DOWN;
2880 commit++;
2881 }
2882 }
2883
2884 return commit;
2885}
2886
2887/*
2888 * Called to commit link state changes noted by inspection step of
2889 * active-backup mode ARP monitor.
2890 *
2891 * Called with RTNL and bond->lock for read.
2892 */
2893static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2894{
2895 struct slave *slave;
2896 int i;
2897
2898 bond_for_each_slave(bond, slave, i) {
2899 switch (slave->new_link) {
2900 case BOND_LINK_NOCHANGE:
2901 continue;
2902
2903 case BOND_LINK_UP:
2904 if ((!bond->curr_active_slave &&
2905 time_before_eq(jiffies,
2906 dev_trans_start(slave->dev) +
2907 delta_in_ticks)) ||
2908 bond->curr_active_slave != slave) {
2909 slave->link = BOND_LINK_UP;
2910 bond->current_arp_slave = NULL;
2911
2912 pr_info("%s: link status definitely up for interface %s.\n",
2913 bond->dev->name, slave->dev->name);
2914
2915 if (!bond->curr_active_slave ||
2916 (slave == bond->primary_slave))
2917 goto do_failover;
2918
2919 }
2920
2921 continue;
2922
2923 case BOND_LINK_DOWN:
2924 if (slave->link_failure_count < UINT_MAX)
2925 slave->link_failure_count++;
2926
2927 slave->link = BOND_LINK_DOWN;
2928 bond_set_slave_inactive_flags(slave);
2929
2930 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2931 bond->dev->name, slave->dev->name);
2932
2933 if (slave == bond->curr_active_slave) {
2934 bond->current_arp_slave = NULL;
2935 goto do_failover;
2936 }
2937
2938 continue;
2939
2940 default:
2941 pr_err("%s: impossible: new_link %d on slave %s\n",
2942 bond->dev->name, slave->new_link,
2943 slave->dev->name);
2944 continue;
2945 }
2946
2947do_failover:
2948 ASSERT_RTNL();
2949 write_lock_bh(&bond->curr_slave_lock);
2950 bond_select_active_slave(bond);
2951 write_unlock_bh(&bond->curr_slave_lock);
2952 }
2953
2954 bond_set_carrier(bond);
2955}
2956
2957/*
2958 * Send ARP probes for active-backup mode ARP monitor.
2959 *
2960 * Called with bond->lock held for read.
2961 */
2962static void bond_ab_arp_probe(struct bonding *bond)
2963{
2964 struct slave *slave;
2965 int i;
2966
2967 read_lock(&bond->curr_slave_lock);
2968
2969 if (bond->current_arp_slave && bond->curr_active_slave)
2970 pr_info("PROBE: c_arp %s && cas %s BAD\n",
2971 bond->current_arp_slave->dev->name,
2972 bond->curr_active_slave->dev->name);
2973
2974 if (bond->curr_active_slave) {
2975 bond_arp_send_all(bond, bond->curr_active_slave);
2976 read_unlock(&bond->curr_slave_lock);
2977 return;
2978 }
2979
2980 read_unlock(&bond->curr_slave_lock);
2981
2982 /* if we don't have a curr_active_slave, search for the next available
2983 * backup slave from the current_arp_slave and make it the candidate
2984 * for becoming the curr_active_slave
2985 */
2986
2987 if (!bond->current_arp_slave) {
2988 bond->current_arp_slave = bond->first_slave;
2989 if (!bond->current_arp_slave)
2990 return;
2991 }
2992
2993 bond_set_slave_inactive_flags(bond->current_arp_slave);
2994
2995 /* search for next candidate */
2996 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
2997 if (IS_UP(slave->dev)) {
2998 slave->link = BOND_LINK_BACK;
2999 bond_set_slave_active_flags(slave);
3000 bond_arp_send_all(bond, slave);
3001 slave->jiffies = jiffies;
3002 bond->current_arp_slave = slave;
3003 break;
3004 }
3005
3006 /* if the link state is up at this point, we
3007 * mark it down - this can happen if we have
3008 * simultaneous link failures and
3009 * reselect_active_interface doesn't make this
3010 * one the current slave so it is still marked
3011 * up when it is actually down
3012 */
3013 if (slave->link == BOND_LINK_UP) {
3014 slave->link = BOND_LINK_DOWN;
3015 if (slave->link_failure_count < UINT_MAX)
3016 slave->link_failure_count++;
3017
3018 bond_set_slave_inactive_flags(slave);
3019
3020 pr_info("%s: backup interface %s is now down.\n",
3021 bond->dev->name, slave->dev->name);
3022 }
3023 }
3024}
3025
3026void bond_activebackup_arp_mon(struct work_struct *work)
3027{
3028 struct bonding *bond = container_of(work, struct bonding,
3029 arp_work.work);
3030 int delta_in_ticks;
3031
3032 read_lock(&bond->lock);
3033
3034 if (bond->kill_timers)
3035 goto out;
3036
3037 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3038
3039 if (bond->slave_cnt == 0)
3040 goto re_arm;
3041
3042 if (bond->send_grat_arp) {
3043 read_lock(&bond->curr_slave_lock);
3044 bond_send_gratuitous_arp(bond);
3045 read_unlock(&bond->curr_slave_lock);
3046 }
3047
3048 if (bond->send_unsol_na) {
3049 read_lock(&bond->curr_slave_lock);
3050 bond_send_unsolicited_na(bond);
3051 read_unlock(&bond->curr_slave_lock);
3052 }
3053
3054 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3055 read_unlock(&bond->lock);
3056 rtnl_lock();
3057 read_lock(&bond->lock);
3058
3059 bond_ab_arp_commit(bond, delta_in_ticks);
3060
3061 read_unlock(&bond->lock);
3062 rtnl_unlock();
3063 read_lock(&bond->lock);
3064 }
3065
3066 bond_ab_arp_probe(bond);
3067
3068re_arm:
3069 if (bond->params.arp_interval)
3070 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3071out:
3072 read_unlock(&bond->lock);
3073}
3074
3075/*------------------------------ proc/seq_file-------------------------------*/
3076
3077#ifdef CONFIG_PROC_FS
3078
3079static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3080 __acquires(&dev_base_lock)
3081 __acquires(&bond->lock)
3082{
3083 struct bonding *bond = seq->private;
3084 loff_t off = 0;
3085 struct slave *slave;
3086 int i;
3087
3088 /* make sure the bond won't be taken away */
3089 read_lock(&dev_base_lock);
3090 read_lock(&bond->lock);
3091
3092 if (*pos == 0)
3093 return SEQ_START_TOKEN;
3094
3095 bond_for_each_slave(bond, slave, i) {
3096 if (++off == *pos)
3097 return slave;
3098 }
3099
3100 return NULL;
3101}
3102
3103static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3104{
3105 struct bonding *bond = seq->private;
3106 struct slave *slave = v;
3107
3108 ++*pos;
3109 if (v == SEQ_START_TOKEN)
3110 return bond->first_slave;
3111
3112 slave = slave->next;
3113
3114 return (slave == bond->first_slave) ? NULL : slave;
3115}
3116
3117static void bond_info_seq_stop(struct seq_file *seq, void *v)
3118 __releases(&bond->lock)
3119 __releases(&dev_base_lock)
3120{
3121 struct bonding *bond = seq->private;
3122
3123 read_unlock(&bond->lock);
3124 read_unlock(&dev_base_lock);
3125}
3126
3127static void bond_info_show_master(struct seq_file *seq)
3128{
3129 struct bonding *bond = seq->private;
3130 struct slave *curr;
3131 int i;
3132
3133 read_lock(&bond->curr_slave_lock);
3134 curr = bond->curr_active_slave;
3135 read_unlock(&bond->curr_slave_lock);
3136
3137 seq_printf(seq, "Bonding Mode: %s",
3138 bond_mode_name(bond->params.mode));
3139
3140 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3141 bond->params.fail_over_mac)
3142 seq_printf(seq, " (fail_over_mac %s)",
3143 fail_over_mac_tbl[bond->params.fail_over_mac].modename);
3144
3145 seq_printf(seq, "\n");
3146
3147 if (bond->params.mode == BOND_MODE_XOR ||
3148 bond->params.mode == BOND_MODE_8023AD) {
3149 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3150 xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3151 bond->params.xmit_policy);
3152 }
3153
3154 if (USES_PRIMARY(bond->params.mode)) {
3155 seq_printf(seq, "Primary Slave: %s",
3156 (bond->primary_slave) ?
3157 bond->primary_slave->dev->name : "None");
3158 if (bond->primary_slave)
3159 seq_printf(seq, " (primary_reselect %s)",
3160 pri_reselect_tbl[bond->params.primary_reselect].modename);
3161
3162 seq_printf(seq, "\nCurrently Active Slave: %s\n",
3163 (curr) ? curr->dev->name : "None");
3164 }
3165
3166 seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3167 "up" : "down");
3168 seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3169 seq_printf(seq, "Up Delay (ms): %d\n",
3170 bond->params.updelay * bond->params.miimon);
3171 seq_printf(seq, "Down Delay (ms): %d\n",
3172 bond->params.downdelay * bond->params.miimon);
3173
3174
3175 /* ARP information */
3176 if (bond->params.arp_interval > 0) {
3177 int printed = 0;
3178 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3179 bond->params.arp_interval);
3180
3181 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3182
3183 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
3184 if (!bond->params.arp_targets[i])
3185 break;
3186 if (printed)
3187 seq_printf(seq, ",");
3188 seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
3189 printed = 1;
3190 }
3191 seq_printf(seq, "\n");
3192 }
3193
3194 if (bond->params.mode == BOND_MODE_8023AD) {
3195 struct ad_info ad_info;
3196
3197 seq_puts(seq, "\n802.3ad info\n");
3198 seq_printf(seq, "LACP rate: %s\n",
3199 (bond->params.lacp_fast) ? "fast" : "slow");
3200 seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
3201 ad_select_tbl[bond->params.ad_select].modename);
3202
3203 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3204 seq_printf(seq, "bond %s has no active aggregator\n",
3205 bond->dev->name);
3206 } else {
3207 seq_printf(seq, "Active Aggregator Info:\n");
3208
3209 seq_printf(seq, "\tAggregator ID: %d\n",
3210 ad_info.aggregator_id);
3211 seq_printf(seq, "\tNumber of ports: %d\n",
3212 ad_info.ports);
3213 seq_printf(seq, "\tActor Key: %d\n",
3214 ad_info.actor_key);
3215 seq_printf(seq, "\tPartner Key: %d\n",
3216 ad_info.partner_key);
3217 seq_printf(seq, "\tPartner Mac Address: %pM\n",
3218 ad_info.partner_system);
3219 }
3220 }
3221}
3222
3223static void bond_info_show_slave(struct seq_file *seq,
3224 const struct slave *slave)
3225{
3226 struct bonding *bond = seq->private;
3227
3228 seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3229 seq_printf(seq, "MII Status: %s\n",
3230 (slave->link == BOND_LINK_UP) ? "up" : "down");
3231 seq_printf(seq, "Link Failure Count: %u\n",
3232 slave->link_failure_count);
3233
3234 seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
3235
3236 if (bond->params.mode == BOND_MODE_8023AD) {
3237 const struct aggregator *agg
3238 = SLAVE_AD_INFO(slave).port.aggregator;
3239
3240 if (agg)
3241 seq_printf(seq, "Aggregator ID: %d\n",
3242 agg->aggregator_identifier);
3243 else
3244 seq_puts(seq, "Aggregator ID: N/A\n");
3245 }
3246}
3247
3248static int bond_info_seq_show(struct seq_file *seq, void *v)
3249{
3250 if (v == SEQ_START_TOKEN) {
3251 seq_printf(seq, "%s\n", version);
3252 bond_info_show_master(seq);
3253 } else
3254 bond_info_show_slave(seq, v);
3255
3256 return 0;
3257}
3258
3259static const struct seq_operations bond_info_seq_ops = {
3260 .start = bond_info_seq_start,
3261 .next = bond_info_seq_next,
3262 .stop = bond_info_seq_stop,
3263 .show = bond_info_seq_show,
3264};
3265
3266static int bond_info_open(struct inode *inode, struct file *file)
3267{
3268 struct seq_file *seq;
3269 struct proc_dir_entry *proc;
3270 int res;
3271
3272 res = seq_open(file, &bond_info_seq_ops);
3273 if (!res) {
3274 /* recover the pointer buried in proc_dir_entry data */
3275 seq = file->private_data;
3276 proc = PDE(inode);
3277 seq->private = proc->data;
3278 }
3279
3280 return res;
3281}
3282
3283static const struct file_operations bond_info_fops = {
3284 .owner = THIS_MODULE,
3285 .open = bond_info_open,
3286 .read = seq_read,
3287 .llseek = seq_lseek,
3288 .release = seq_release,
3289};
3290
3291static void bond_create_proc_entry(struct bonding *bond)
3292{
3293 struct net_device *bond_dev = bond->dev;
3294 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
3295
3296 if (bn->proc_dir) {
3297 bond->proc_entry = proc_create_data(bond_dev->name,
3298 S_IRUGO, bn->proc_dir,
3299 &bond_info_fops, bond);
3300 if (bond->proc_entry == NULL)
3301 pr_warning("Warning: Cannot create /proc/net/%s/%s\n",
3302 DRV_NAME, bond_dev->name);
3303 else
3304 memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3305 }
3306}
3307
3308static void bond_remove_proc_entry(struct bonding *bond)
3309{
3310 struct net_device *bond_dev = bond->dev;
3311 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
3312
3313 if (bn->proc_dir && bond->proc_entry) {
3314 remove_proc_entry(bond->proc_file_name, bn->proc_dir);
3315 memset(bond->proc_file_name, 0, IFNAMSIZ);
3316 bond->proc_entry = NULL;
3317 }
3318}
3319
3320/* Create the bonding directory under /proc/net, if doesn't exist yet.
3321 * Caller must hold rtnl_lock.
3322 */
3323static void __net_init bond_create_proc_dir(struct bond_net *bn)
3324{
3325 if (!bn->proc_dir) {
3326 bn->proc_dir = proc_mkdir(DRV_NAME, bn->net->proc_net);
3327 if (!bn->proc_dir)
3328 pr_warning("Warning: cannot create /proc/net/%s\n",
3329 DRV_NAME);
3330 }
3331}
3332
3333/* Destroy the bonding directory under /proc/net, if empty.
3334 * Caller must hold rtnl_lock.
3335 */
3336static void __net_exit bond_destroy_proc_dir(struct bond_net *bn)
3337{
3338 if (bn->proc_dir) {
3339 remove_proc_entry(DRV_NAME, bn->net->proc_net);
3340 bn->proc_dir = NULL;
3341 }
3342}
3343
3344#else /* !CONFIG_PROC_FS */
3345
3346static void bond_create_proc_entry(struct bonding *bond)
3347{
3348}
3349
3350static void bond_remove_proc_entry(struct bonding *bond)
3351{
3352}
3353
3354static inline void bond_create_proc_dir(struct bond_net *bn)
3355{
3356}
3357
3358static inline void bond_destroy_proc_dir(struct bond_net *bn)
3359{
3360}
3361
3362#endif /* CONFIG_PROC_FS */
3363
3364
3365/*-------------------------- netdev event handling --------------------------*/
3366
3367/*
3368 * Change device name
3369 */
3370static int bond_event_changename(struct bonding *bond)
3371{
3372 bond_remove_proc_entry(bond);
3373 bond_create_proc_entry(bond);
3374
3375 return NOTIFY_DONE;
3376}
3377
3378static int bond_master_netdev_event(unsigned long event,
3379 struct net_device *bond_dev)
3380{
3381 struct bonding *event_bond = netdev_priv(bond_dev);
3382
3383 switch (event) {
3384 case NETDEV_CHANGENAME:
3385 return bond_event_changename(event_bond);
3386 default:
3387 break;
3388 }
3389
3390 return NOTIFY_DONE;
3391}
3392
3393static int bond_slave_netdev_event(unsigned long event,
3394 struct net_device *slave_dev)
3395{
3396 struct net_device *bond_dev = slave_dev->master;
3397 struct bonding *bond = netdev_priv(bond_dev);
3398
3399 switch (event) {
3400 case NETDEV_UNREGISTER:
3401 if (bond_dev) {
3402 if (bond->setup_by_slave)
3403 bond_release_and_destroy(bond_dev, slave_dev);
3404 else
3405 bond_release(bond_dev, slave_dev);
3406 }
3407 break;
3408 case NETDEV_CHANGE:
3409 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3410 struct slave *slave;
3411
3412 slave = bond_get_slave_by_dev(bond, slave_dev);
3413 if (slave) {
3414 u16 old_speed = slave->speed;
3415 u16 old_duplex = slave->duplex;
3416
3417 bond_update_speed_duplex(slave);
3418
3419 if (bond_is_lb(bond))
3420 break;
3421
3422 if (old_speed != slave->speed)
3423 bond_3ad_adapter_speed_changed(slave);
3424 if (old_duplex != slave->duplex)
3425 bond_3ad_adapter_duplex_changed(slave);
3426 }
3427 }
3428
3429 break;
3430 case NETDEV_DOWN:
3431 /*
3432 * ... Or is it this?
3433 */
3434 break;
3435 case NETDEV_CHANGEMTU:
3436 /*
3437 * TODO: Should slaves be allowed to
3438 * independently alter their MTU? For
3439 * an active-backup bond, slaves need
3440 * not be the same type of device, so
3441 * MTUs may vary. For other modes,
3442 * slaves arguably should have the
3443 * same MTUs. To do this, we'd need to
3444 * take over the slave's change_mtu
3445 * function for the duration of their
3446 * servitude.
3447 */
3448 break;
3449 case NETDEV_CHANGENAME:
3450 /*
3451 * TODO: handle changing the primary's name
3452 */
3453 break;
3454 case NETDEV_FEAT_CHANGE:
3455 bond_compute_features(bond);
3456 break;
3457 default:
3458 break;
3459 }
3460
3461 return NOTIFY_DONE;
3462}
3463
3464/*
3465 * bond_netdev_event: handle netdev notifier chain events.
3466 *
3467 * This function receives events for the netdev chain. The caller (an
3468 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3469 * locks for us to safely manipulate the slave devices (RTNL lock,
3470 * dev_probe_lock).
3471 */
3472static int bond_netdev_event(struct notifier_block *this,
3473 unsigned long event, void *ptr)
3474{
3475 struct net_device *event_dev = (struct net_device *)ptr;
3476
3477 pr_debug("event_dev: %s, event: %lx\n",
3478 event_dev ? event_dev->name : "None",
3479 event);
3480
3481 if (!(event_dev->priv_flags & IFF_BONDING))
3482 return NOTIFY_DONE;
3483
3484 if (event_dev->flags & IFF_MASTER) {
3485 pr_debug("IFF_MASTER\n");
3486 return bond_master_netdev_event(event, event_dev);
3487 }
3488
3489 if (event_dev->flags & IFF_SLAVE) {
3490 pr_debug("IFF_SLAVE\n");
3491 return bond_slave_netdev_event(event, event_dev);
3492 }
3493
3494 return NOTIFY_DONE;
3495}
3496
3497/*
3498 * bond_inetaddr_event: handle inetaddr notifier chain events.
3499 *
3500 * We keep track of device IPs primarily to use as source addresses in
3501 * ARP monitor probes (rather than spewing out broadcasts all the time).
3502 *
3503 * We track one IP for the main device (if it has one), plus one per VLAN.
3504 */
3505static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3506{
3507 struct in_ifaddr *ifa = ptr;
3508 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3509 struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3510 struct bonding *bond;
3511 struct vlan_entry *vlan;
3512
3513 list_for_each_entry(bond, &bn->dev_list, bond_list) {
3514 if (bond->dev == event_dev) {
3515 switch (event) {
3516 case NETDEV_UP:
3517 bond->master_ip = ifa->ifa_local;
3518 return NOTIFY_OK;
3519 case NETDEV_DOWN:
3520 bond->master_ip = bond_glean_dev_ip(bond->dev);
3521 return NOTIFY_OK;
3522 default:
3523 return NOTIFY_DONE;
3524 }
3525 }
3526
3527 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3528 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3529 if (vlan_dev == event_dev) {
3530 switch (event) {
3531 case NETDEV_UP:
3532 vlan->vlan_ip = ifa->ifa_local;
3533 return NOTIFY_OK;
3534 case NETDEV_DOWN:
3535 vlan->vlan_ip =
3536 bond_glean_dev_ip(vlan_dev);
3537 return NOTIFY_OK;
3538 default:
3539 return NOTIFY_DONE;
3540 }
3541 }
3542 }
3543 }
3544 return NOTIFY_DONE;
3545}
3546
3547static struct notifier_block bond_netdev_notifier = {
3548 .notifier_call = bond_netdev_event,
3549};
3550
3551static struct notifier_block bond_inetaddr_notifier = {
3552 .notifier_call = bond_inetaddr_event,
3553};
3554
3555/*-------------------------- Packet type handling ---------------------------*/
3556
3557/* register to receive lacpdus on a bond */
3558static void bond_register_lacpdu(struct bonding *bond)
3559{
3560 struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3561
3562 /* initialize packet type */
3563 pk_type->type = PKT_TYPE_LACPDU;
3564 pk_type->dev = bond->dev;
3565 pk_type->func = bond_3ad_lacpdu_recv;
3566
3567 dev_add_pack(pk_type);
3568}
3569
3570/* unregister to receive lacpdus on a bond */
3571static void bond_unregister_lacpdu(struct bonding *bond)
3572{
3573 dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3574}
3575
3576void bond_register_arp(struct bonding *bond)
3577{
3578 struct packet_type *pt = &bond->arp_mon_pt;
3579
3580 if (pt->type)
3581 return;
3582
3583 pt->type = htons(ETH_P_ARP);
3584 pt->dev = bond->dev;
3585 pt->func = bond_arp_rcv;
3586 dev_add_pack(pt);
3587}
3588
3589void bond_unregister_arp(struct bonding *bond)
3590{
3591 struct packet_type *pt = &bond->arp_mon_pt;
3592
3593 dev_remove_pack(pt);
3594 pt->type = 0;
3595}
3596
3597/*---------------------------- Hashing Policies -----------------------------*/
3598
3599/*
3600 * Hash for the output device based upon layer 2 and layer 3 data. If
3601 * the packet is not IP mimic bond_xmit_hash_policy_l2()
3602 */
3603static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3604{
3605 struct ethhdr *data = (struct ethhdr *)skb->data;
3606 struct iphdr *iph = ip_hdr(skb);
3607
3608 if (skb->protocol == htons(ETH_P_IP)) {
3609 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3610 (data->h_dest[5] ^ data->h_source[5])) % count;
3611 }
3612
3613 return (data->h_dest[5] ^ data->h_source[5]) % count;
3614}
3615
3616/*
3617 * Hash for the output device based upon layer 3 and layer 4 data. If
3618 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3619 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3620 */
3621static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3622{
3623 struct ethhdr *data = (struct ethhdr *)skb->data;
3624 struct iphdr *iph = ip_hdr(skb);
3625 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3626 int layer4_xor = 0;
3627
3628 if (skb->protocol == htons(ETH_P_IP)) {
3629 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3630 (iph->protocol == IPPROTO_TCP ||
3631 iph->protocol == IPPROTO_UDP)) {
3632 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3633 }
3634 return (layer4_xor ^
3635 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3636
3637 }
3638
3639 return (data->h_dest[5] ^ data->h_source[5]) % count;
3640}
3641
3642/*
3643 * Hash for the output device based upon layer 2 data
3644 */
3645static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3646{
3647 struct ethhdr *data = (struct ethhdr *)skb->data;
3648
3649 return (data->h_dest[5] ^ data->h_source[5]) % count;
3650}
3651
3652/*-------------------------- Device entry points ----------------------------*/
3653
3654static int bond_open(struct net_device *bond_dev)
3655{
3656 struct bonding *bond = netdev_priv(bond_dev);
3657
3658 bond->kill_timers = 0;
3659
3660 if (bond_is_lb(bond)) {
3661 /* bond_alb_initialize must be called before the timer
3662 * is started.
3663 */
3664 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3665 /* something went wrong - fail the open operation */
3666 return -ENOMEM;
3667 }
3668
3669 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3670 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3671 }
3672
3673 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3674 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3675 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3676 }
3677
3678 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3679 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3680 INIT_DELAYED_WORK(&bond->arp_work,
3681 bond_activebackup_arp_mon);
3682 else
3683 INIT_DELAYED_WORK(&bond->arp_work,
3684 bond_loadbalance_arp_mon);
3685
3686 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3687 if (bond->params.arp_validate)
3688 bond_register_arp(bond);
3689 }
3690
3691 if (bond->params.mode == BOND_MODE_8023AD) {
3692 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3693 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3694 /* register to receive LACPDUs */
3695 bond_register_lacpdu(bond);
3696 bond_3ad_initiate_agg_selection(bond, 1);
3697 }
3698
3699 return 0;
3700}
3701
3702static int bond_close(struct net_device *bond_dev)
3703{
3704 struct bonding *bond = netdev_priv(bond_dev);
3705
3706 if (bond->params.mode == BOND_MODE_8023AD) {
3707 /* Unregister the receive of LACPDUs */
3708 bond_unregister_lacpdu(bond);
3709 }
3710
3711 if (bond->params.arp_validate)
3712 bond_unregister_arp(bond);
3713
3714 write_lock_bh(&bond->lock);
3715
3716 bond->send_grat_arp = 0;
3717 bond->send_unsol_na = 0;
3718
3719 /* signal timers not to re-arm */
3720 bond->kill_timers = 1;
3721
3722 write_unlock_bh(&bond->lock);
3723
3724 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3725 cancel_delayed_work(&bond->mii_work);
3726 }
3727
3728 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3729 cancel_delayed_work(&bond->arp_work);
3730 }
3731
3732 switch (bond->params.mode) {
3733 case BOND_MODE_8023AD:
3734 cancel_delayed_work(&bond->ad_work);
3735 break;
3736 case BOND_MODE_TLB:
3737 case BOND_MODE_ALB:
3738 cancel_delayed_work(&bond->alb_work);
3739 break;
3740 default:
3741 break;
3742 }
3743
3744
3745 if (bond_is_lb(bond)) {
3746 /* Must be called only after all
3747 * slaves have been released
3748 */
3749 bond_alb_deinitialize(bond);
3750 }
3751
3752 return 0;
3753}
3754
3755static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3756{
3757 struct bonding *bond = netdev_priv(bond_dev);
3758 struct net_device_stats *stats = &bond_dev->stats;
3759 struct net_device_stats local_stats;
3760 struct slave *slave;
3761 int i;
3762
3763 memset(&local_stats, 0, sizeof(struct net_device_stats));
3764
3765 read_lock_bh(&bond->lock);
3766
3767 bond_for_each_slave(bond, slave, i) {
3768 const struct net_device_stats *sstats = dev_get_stats(slave->dev);
3769
3770 local_stats.rx_packets += sstats->rx_packets;
3771 local_stats.rx_bytes += sstats->rx_bytes;
3772 local_stats.rx_errors += sstats->rx_errors;
3773 local_stats.rx_dropped += sstats->rx_dropped;
3774
3775 local_stats.tx_packets += sstats->tx_packets;
3776 local_stats.tx_bytes += sstats->tx_bytes;
3777 local_stats.tx_errors += sstats->tx_errors;
3778 local_stats.tx_dropped += sstats->tx_dropped;
3779
3780 local_stats.multicast += sstats->multicast;
3781 local_stats.collisions += sstats->collisions;
3782
3783 local_stats.rx_length_errors += sstats->rx_length_errors;
3784 local_stats.rx_over_errors += sstats->rx_over_errors;
3785 local_stats.rx_crc_errors += sstats->rx_crc_errors;
3786 local_stats.rx_frame_errors += sstats->rx_frame_errors;
3787 local_stats.rx_fifo_errors += sstats->rx_fifo_errors;
3788 local_stats.rx_missed_errors += sstats->rx_missed_errors;
3789
3790 local_stats.tx_aborted_errors += sstats->tx_aborted_errors;
3791 local_stats.tx_carrier_errors += sstats->tx_carrier_errors;
3792 local_stats.tx_fifo_errors += sstats->tx_fifo_errors;
3793 local_stats.tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3794 local_stats.tx_window_errors += sstats->tx_window_errors;
3795 }
3796
3797 memcpy(stats, &local_stats, sizeof(struct net_device_stats));
3798
3799 read_unlock_bh(&bond->lock);
3800
3801 return stats;
3802}
3803
3804static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3805{
3806 struct net_device *slave_dev = NULL;
3807 struct ifbond k_binfo;
3808 struct ifbond __user *u_binfo = NULL;
3809 struct ifslave k_sinfo;
3810 struct ifslave __user *u_sinfo = NULL;
3811 struct mii_ioctl_data *mii = NULL;
3812 int res = 0;
3813
3814 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3815
3816 switch (cmd) {
3817 case SIOCGMIIPHY:
3818 mii = if_mii(ifr);
3819 if (!mii)
3820 return -EINVAL;
3821
3822 mii->phy_id = 0;
3823 /* Fall Through */
3824 case SIOCGMIIREG:
3825 /*
3826 * We do this again just in case we were called by SIOCGMIIREG
3827 * instead of SIOCGMIIPHY.
3828 */
3829 mii = if_mii(ifr);
3830 if (!mii)
3831 return -EINVAL;
3832
3833
3834 if (mii->reg_num == 1) {
3835 struct bonding *bond = netdev_priv(bond_dev);
3836 mii->val_out = 0;
3837 read_lock(&bond->lock);
3838 read_lock(&bond->curr_slave_lock);
3839 if (netif_carrier_ok(bond->dev))
3840 mii->val_out = BMSR_LSTATUS;
3841
3842 read_unlock(&bond->curr_slave_lock);
3843 read_unlock(&bond->lock);
3844 }
3845
3846 return 0;
3847 case BOND_INFO_QUERY_OLD:
3848 case SIOCBONDINFOQUERY:
3849 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3850
3851 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3852 return -EFAULT;
3853
3854 res = bond_info_query(bond_dev, &k_binfo);
3855 if (res == 0 &&
3856 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3857 return -EFAULT;
3858
3859 return res;
3860 case BOND_SLAVE_INFO_QUERY_OLD:
3861 case SIOCBONDSLAVEINFOQUERY:
3862 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3863
3864 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3865 return -EFAULT;
3866
3867 res = bond_slave_info_query(bond_dev, &k_sinfo);
3868 if (res == 0 &&
3869 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3870 return -EFAULT;
3871
3872 return res;
3873 default:
3874 /* Go on */
3875 break;
3876 }
3877
3878 if (!capable(CAP_NET_ADMIN))
3879 return -EPERM;
3880
3881 slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3882
3883 pr_debug("slave_dev=%p:\n", slave_dev);
3884
3885 if (!slave_dev)
3886 res = -ENODEV;
3887 else {
3888 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3889 switch (cmd) {
3890 case BOND_ENSLAVE_OLD:
3891 case SIOCBONDENSLAVE:
3892 res = bond_enslave(bond_dev, slave_dev);
3893 break;
3894 case BOND_RELEASE_OLD:
3895 case SIOCBONDRELEASE:
3896 res = bond_release(bond_dev, slave_dev);
3897 break;
3898 case BOND_SETHWADDR_OLD:
3899 case SIOCBONDSETHWADDR:
3900 res = bond_sethwaddr(bond_dev, slave_dev);
3901 break;
3902 case BOND_CHANGE_ACTIVE_OLD:
3903 case SIOCBONDCHANGEACTIVE:
3904 res = bond_ioctl_change_active(bond_dev, slave_dev);
3905 break;
3906 default:
3907 res = -EOPNOTSUPP;
3908 }
3909
3910 dev_put(slave_dev);
3911 }
3912
3913 return res;
3914}
3915
3916static void bond_set_multicast_list(struct net_device *bond_dev)
3917{
3918 struct bonding *bond = netdev_priv(bond_dev);
3919 struct dev_mc_list *dmi;
3920
3921 /*
3922 * Do promisc before checking multicast_mode
3923 */
3924 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC))
3925 /*
3926 * FIXME: Need to handle the error when one of the multi-slaves
3927 * encounters error.
3928 */
3929 bond_set_promiscuity(bond, 1);
3930
3931
3932 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC))
3933 bond_set_promiscuity(bond, -1);
3934
3935
3936 /* set allmulti flag to slaves */
3937 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI))
3938 /*
3939 * FIXME: Need to handle the error when one of the multi-slaves
3940 * encounters error.
3941 */
3942 bond_set_allmulti(bond, 1);
3943
3944
3945 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI))
3946 bond_set_allmulti(bond, -1);
3947
3948
3949 read_lock(&bond->lock);
3950
3951 bond->flags = bond_dev->flags;
3952
3953 /* looking for addresses to add to slaves' mc list */
3954 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3955 if (!bond_mc_list_find_dmi(dmi, bond->mc_list))
3956 bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3957 }
3958
3959 /* looking for addresses to delete from slaves' list */
3960 for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3961 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list))
3962 bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3963 }
3964
3965 /* save master's multicast list */
3966 bond_mc_list_destroy(bond);
3967 bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3968
3969 read_unlock(&bond->lock);
3970}
3971
3972static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
3973{
3974 struct bonding *bond = netdev_priv(dev);
3975 struct slave *slave = bond->first_slave;
3976
3977 if (slave) {
3978 const struct net_device_ops *slave_ops
3979 = slave->dev->netdev_ops;
3980 if (slave_ops->ndo_neigh_setup)
3981 return slave_ops->ndo_neigh_setup(slave->dev, parms);
3982 }
3983 return 0;
3984}
3985
3986/*
3987 * Change the MTU of all of a master's slaves to match the master
3988 */
3989static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3990{
3991 struct bonding *bond = netdev_priv(bond_dev);
3992 struct slave *slave, *stop_at;
3993 int res = 0;
3994 int i;
3995
3996 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3997 (bond_dev ? bond_dev->name : "None"), new_mtu);
3998
3999 /* Can't hold bond->lock with bh disabled here since
4000 * some base drivers panic. On the other hand we can't
4001 * hold bond->lock without bh disabled because we'll
4002 * deadlock. The only solution is to rely on the fact
4003 * that we're under rtnl_lock here, and the slaves
4004 * list won't change. This doesn't solve the problem
4005 * of setting the slave's MTU while it is
4006 * transmitting, but the assumption is that the base
4007 * driver can handle that.
4008 *
4009 * TODO: figure out a way to safely iterate the slaves
4010 * list, but without holding a lock around the actual
4011 * call to the base driver.
4012 */
4013
4014 bond_for_each_slave(bond, slave, i) {
4015 pr_debug("s %p s->p %p c_m %p\n",
4016 slave,
4017 slave->prev,
4018 slave->dev->netdev_ops->ndo_change_mtu);
4019
4020 res = dev_set_mtu(slave->dev, new_mtu);
4021
4022 if (res) {
4023 /* If we failed to set the slave's mtu to the new value
4024 * we must abort the operation even in ACTIVE_BACKUP
4025 * mode, because if we allow the backup slaves to have
4026 * different mtu values than the active slave we'll
4027 * need to change their mtu when doing a failover. That
4028 * means changing their mtu from timer context, which
4029 * is probably not a good idea.
4030 */
4031 pr_debug("err %d %s\n", res, slave->dev->name);
4032 goto unwind;
4033 }
4034 }
4035
4036 bond_dev->mtu = new_mtu;
4037
4038 return 0;
4039
4040unwind:
4041 /* unwind from head to the slave that failed */
4042 stop_at = slave;
4043 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4044 int tmp_res;
4045
4046 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4047 if (tmp_res) {
4048 pr_debug("unwind err %d dev %s\n",
4049 tmp_res, slave->dev->name);
4050 }
4051 }
4052
4053 return res;
4054}
4055
4056/*
4057 * Change HW address
4058 *
4059 * Note that many devices must be down to change the HW address, and
4060 * downing the master releases all slaves. We can make bonds full of
4061 * bonding devices to test this, however.
4062 */
4063static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4064{
4065 struct bonding *bond = netdev_priv(bond_dev);
4066 struct sockaddr *sa = addr, tmp_sa;
4067 struct slave *slave, *stop_at;
4068 int res = 0;
4069 int i;
4070
4071 if (bond->params.mode == BOND_MODE_ALB)
4072 return bond_alb_set_mac_address(bond_dev, addr);
4073
4074
4075 pr_debug("bond=%p, name=%s\n",
4076 bond, bond_dev ? bond_dev->name : "None");
4077
4078 /*
4079 * If fail_over_mac is set to active, do nothing and return
4080 * success. Returning an error causes ifenslave to fail.
4081 */
4082 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
4083 return 0;
4084
4085 if (!is_valid_ether_addr(sa->sa_data))
4086 return -EADDRNOTAVAIL;
4087
4088 /* Can't hold bond->lock with bh disabled here since
4089 * some base drivers panic. On the other hand we can't
4090 * hold bond->lock without bh disabled because we'll
4091 * deadlock. The only solution is to rely on the fact
4092 * that we're under rtnl_lock here, and the slaves
4093 * list won't change. This doesn't solve the problem
4094 * of setting the slave's hw address while it is
4095 * transmitting, but the assumption is that the base
4096 * driver can handle that.
4097 *
4098 * TODO: figure out a way to safely iterate the slaves
4099 * list, but without holding a lock around the actual
4100 * call to the base driver.
4101 */
4102
4103 bond_for_each_slave(bond, slave, i) {
4104 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
4105 pr_debug("slave %p %s\n", slave, slave->dev->name);
4106
4107 if (slave_ops->ndo_set_mac_address == NULL) {
4108 res = -EOPNOTSUPP;
4109 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
4110 goto unwind;
4111 }
4112
4113 res = dev_set_mac_address(slave->dev, addr);
4114 if (res) {
4115 /* TODO: consider downing the slave
4116 * and retry ?
4117 * User should expect communications
4118 * breakage anyway until ARP finish
4119 * updating, so...
4120 */
4121 pr_debug("err %d %s\n", res, slave->dev->name);
4122 goto unwind;
4123 }
4124 }
4125
4126 /* success */
4127 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4128 return 0;
4129
4130unwind:
4131 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4132 tmp_sa.sa_family = bond_dev->type;
4133
4134 /* unwind from head to the slave that failed */
4135 stop_at = slave;
4136 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4137 int tmp_res;
4138
4139 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4140 if (tmp_res) {
4141 pr_debug("unwind err %d dev %s\n",
4142 tmp_res, slave->dev->name);
4143 }
4144 }
4145
4146 return res;
4147}
4148
4149static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4150{
4151 struct bonding *bond = netdev_priv(bond_dev);
4152 struct slave *slave, *start_at;
4153 int i, slave_no, res = 1;
4154
4155 read_lock(&bond->lock);
4156
4157 if (!BOND_IS_OK(bond))
4158 goto out;
4159
4160 /*
4161 * Concurrent TX may collide on rr_tx_counter; we accept that
4162 * as being rare enough not to justify using an atomic op here
4163 */
4164 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4165
4166 bond_for_each_slave(bond, slave, i) {
4167 slave_no--;
4168 if (slave_no < 0)
4169 break;
4170 }
4171
4172 start_at = slave;
4173 bond_for_each_slave_from(bond, slave, i, start_at) {
4174 if (IS_UP(slave->dev) &&
4175 (slave->link == BOND_LINK_UP) &&
4176 (slave->state == BOND_STATE_ACTIVE)) {
4177 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4178 break;
4179 }
4180 }
4181
4182out:
4183 if (res) {
4184 /* no suitable interface, frame not sent */
4185 dev_kfree_skb(skb);
4186 }
4187 read_unlock(&bond->lock);
4188 return NETDEV_TX_OK;
4189}
4190
4191
4192/*
4193 * in active-backup mode, we know that bond->curr_active_slave is always valid if
4194 * the bond has a usable interface.
4195 */
4196static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4197{
4198 struct bonding *bond = netdev_priv(bond_dev);
4199 int res = 1;
4200
4201 read_lock(&bond->lock);
4202 read_lock(&bond->curr_slave_lock);
4203
4204 if (!BOND_IS_OK(bond))
4205 goto out;
4206
4207 if (!bond->curr_active_slave)
4208 goto out;
4209
4210 res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4211
4212out:
4213 if (res)
4214 /* no suitable interface, frame not sent */
4215 dev_kfree_skb(skb);
4216
4217 read_unlock(&bond->curr_slave_lock);
4218 read_unlock(&bond->lock);
4219 return NETDEV_TX_OK;
4220}
4221
4222/*
4223 * In bond_xmit_xor() , we determine the output device by using a pre-
4224 * determined xmit_hash_policy(), If the selected device is not enabled,
4225 * find the next active slave.
4226 */
4227static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4228{
4229 struct bonding *bond = netdev_priv(bond_dev);
4230 struct slave *slave, *start_at;
4231 int slave_no;
4232 int i;
4233 int res = 1;
4234
4235 read_lock(&bond->lock);
4236
4237 if (!BOND_IS_OK(bond))
4238 goto out;
4239
4240 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4241
4242 bond_for_each_slave(bond, slave, i) {
4243 slave_no--;
4244 if (slave_no < 0)
4245 break;
4246 }
4247
4248 start_at = slave;
4249
4250 bond_for_each_slave_from(bond, slave, i, start_at) {
4251 if (IS_UP(slave->dev) &&
4252 (slave->link == BOND_LINK_UP) &&
4253 (slave->state == BOND_STATE_ACTIVE)) {
4254 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4255 break;
4256 }
4257 }
4258
4259out:
4260 if (res) {
4261 /* no suitable interface, frame not sent */
4262 dev_kfree_skb(skb);
4263 }
4264 read_unlock(&bond->lock);
4265 return NETDEV_TX_OK;
4266}
4267
4268/*
4269 * in broadcast mode, we send everything to all usable interfaces.
4270 */
4271static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4272{
4273 struct bonding *bond = netdev_priv(bond_dev);
4274 struct slave *slave, *start_at;
4275 struct net_device *tx_dev = NULL;
4276 int i;
4277 int res = 1;
4278
4279 read_lock(&bond->lock);
4280
4281 if (!BOND_IS_OK(bond))
4282 goto out;
4283
4284 read_lock(&bond->curr_slave_lock);
4285 start_at = bond->curr_active_slave;
4286 read_unlock(&bond->curr_slave_lock);
4287
4288 if (!start_at)
4289 goto out;
4290
4291 bond_for_each_slave_from(bond, slave, i, start_at) {
4292 if (IS_UP(slave->dev) &&
4293 (slave->link == BOND_LINK_UP) &&
4294 (slave->state == BOND_STATE_ACTIVE)) {
4295 if (tx_dev) {
4296 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4297 if (!skb2) {
4298 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4299 bond_dev->name);
4300 continue;
4301 }
4302
4303 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4304 if (res) {
4305 dev_kfree_skb(skb2);
4306 continue;
4307 }
4308 }
4309 tx_dev = slave->dev;
4310 }
4311 }
4312
4313 if (tx_dev)
4314 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4315
4316out:
4317 if (res)
4318 /* no suitable interface, frame not sent */
4319 dev_kfree_skb(skb);
4320
4321 /* frame sent to all suitable interfaces */
4322 read_unlock(&bond->lock);
4323 return NETDEV_TX_OK;
4324}
4325
4326/*------------------------- Device initialization ---------------------------*/
4327
4328static void bond_set_xmit_hash_policy(struct bonding *bond)
4329{
4330 switch (bond->params.xmit_policy) {
4331 case BOND_XMIT_POLICY_LAYER23:
4332 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4333 break;
4334 case BOND_XMIT_POLICY_LAYER34:
4335 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4336 break;
4337 case BOND_XMIT_POLICY_LAYER2:
4338 default:
4339 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4340 break;
4341 }
4342}
4343
4344static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4345{
4346 const struct bonding *bond = netdev_priv(dev);
4347
4348 switch (bond->params.mode) {
4349 case BOND_MODE_ROUNDROBIN:
4350 return bond_xmit_roundrobin(skb, dev);
4351 case BOND_MODE_ACTIVEBACKUP:
4352 return bond_xmit_activebackup(skb, dev);
4353 case BOND_MODE_XOR:
4354 return bond_xmit_xor(skb, dev);
4355 case BOND_MODE_BROADCAST:
4356 return bond_xmit_broadcast(skb, dev);
4357 case BOND_MODE_8023AD:
4358 return bond_3ad_xmit_xor(skb, dev);
4359 case BOND_MODE_ALB:
4360 case BOND_MODE_TLB:
4361 return bond_alb_xmit(skb, dev);
4362 default:
4363 /* Should never happen, mode already checked */
4364 pr_err("%s: Error: Unknown bonding mode %d\n",
4365 dev->name, bond->params.mode);
4366 WARN_ON_ONCE(1);
4367 dev_kfree_skb(skb);
4368 return NETDEV_TX_OK;
4369 }
4370}
4371
4372
4373/*
4374 * set bond mode specific net device operations
4375 */
4376void bond_set_mode_ops(struct bonding *bond, int mode)
4377{
4378 struct net_device *bond_dev = bond->dev;
4379
4380 switch (mode) {
4381 case BOND_MODE_ROUNDROBIN:
4382 break;
4383 case BOND_MODE_ACTIVEBACKUP:
4384 break;
4385 case BOND_MODE_XOR:
4386 bond_set_xmit_hash_policy(bond);
4387 break;
4388 case BOND_MODE_BROADCAST:
4389 break;
4390 case BOND_MODE_8023AD:
4391 bond_set_master_3ad_flags(bond);
4392 bond_set_xmit_hash_policy(bond);
4393 break;
4394 case BOND_MODE_ALB:
4395 bond_set_master_alb_flags(bond);
4396 /* FALLTHRU */
4397 case BOND_MODE_TLB:
4398 break;
4399 default:
4400 /* Should never happen, mode already checked */
4401 pr_err("%s: Error: Unknown bonding mode %d\n",
4402 bond_dev->name, mode);
4403 break;
4404 }
4405}
4406
4407static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4408 struct ethtool_drvinfo *drvinfo)
4409{
4410 strncpy(drvinfo->driver, DRV_NAME, 32);
4411 strncpy(drvinfo->version, DRV_VERSION, 32);
4412 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4413}
4414
4415static const struct ethtool_ops bond_ethtool_ops = {
4416 .get_drvinfo = bond_ethtool_get_drvinfo,
4417 .get_link = ethtool_op_get_link,
4418 .get_tx_csum = ethtool_op_get_tx_csum,
4419 .get_sg = ethtool_op_get_sg,
4420 .get_tso = ethtool_op_get_tso,
4421 .get_ufo = ethtool_op_get_ufo,
4422 .get_flags = ethtool_op_get_flags,
4423};
4424
4425static const struct net_device_ops bond_netdev_ops = {
4426 .ndo_init = bond_init,
4427 .ndo_uninit = bond_uninit,
4428 .ndo_open = bond_open,
4429 .ndo_stop = bond_close,
4430 .ndo_start_xmit = bond_start_xmit,
4431 .ndo_get_stats = bond_get_stats,
4432 .ndo_do_ioctl = bond_do_ioctl,
4433 .ndo_set_multicast_list = bond_set_multicast_list,
4434 .ndo_change_mtu = bond_change_mtu,
4435 .ndo_set_mac_address = bond_set_mac_address,
4436 .ndo_neigh_setup = bond_neigh_setup,
4437 .ndo_vlan_rx_register = bond_vlan_rx_register,
4438 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4439 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4440};
4441
4442static void bond_setup(struct net_device *bond_dev)
4443{
4444 struct bonding *bond = netdev_priv(bond_dev);
4445
4446 /* initialize rwlocks */
4447 rwlock_init(&bond->lock);
4448 rwlock_init(&bond->curr_slave_lock);
4449
4450 bond->params = bonding_defaults;
4451
4452 /* Initialize pointers */
4453 bond->dev = bond_dev;
4454 INIT_LIST_HEAD(&bond->vlan_list);
4455
4456 /* Initialize the device entry points */
4457 ether_setup(bond_dev);
4458 bond_dev->netdev_ops = &bond_netdev_ops;
4459 bond_dev->ethtool_ops = &bond_ethtool_ops;
4460 bond_set_mode_ops(bond, bond->params.mode);
4461
4462 bond_dev->destructor = free_netdev;
4463
4464 /* Initialize the device options */
4465 bond_dev->tx_queue_len = 0;
4466 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4467 bond_dev->priv_flags |= IFF_BONDING;
4468 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
4469
4470 if (bond->params.arp_interval)
4471 bond_dev->priv_flags |= IFF_MASTER_ARPMON;
4472
4473 /* At first, we block adding VLANs. That's the only way to
4474 * prevent problems that occur when adding VLANs over an
4475 * empty bond. The block will be removed once non-challenged
4476 * slaves are enslaved.
4477 */
4478 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4479
4480 /* don't acquire bond device's netif_tx_lock when
4481 * transmitting */
4482 bond_dev->features |= NETIF_F_LLTX;
4483
4484 /* By default, we declare the bond to be fully
4485 * VLAN hardware accelerated capable. Special
4486 * care is taken in the various xmit functions
4487 * when there are slaves that are not hw accel
4488 * capable
4489 */
4490 bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4491 NETIF_F_HW_VLAN_RX |
4492 NETIF_F_HW_VLAN_FILTER);
4493
4494}
4495
4496static void bond_work_cancel_all(struct bonding *bond)
4497{
4498 write_lock_bh(&bond->lock);
4499 bond->kill_timers = 1;
4500 write_unlock_bh(&bond->lock);
4501
4502 if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4503 cancel_delayed_work(&bond->mii_work);
4504
4505 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4506 cancel_delayed_work(&bond->arp_work);
4507
4508 if (bond->params.mode == BOND_MODE_ALB &&
4509 delayed_work_pending(&bond->alb_work))
4510 cancel_delayed_work(&bond->alb_work);
4511
4512 if (bond->params.mode == BOND_MODE_8023AD &&
4513 delayed_work_pending(&bond->ad_work))
4514 cancel_delayed_work(&bond->ad_work);
4515}
4516
4517/*
4518* Destroy a bonding device.
4519* Must be under rtnl_lock when this function is called.
4520*/
4521static void bond_uninit(struct net_device *bond_dev)
4522{
4523 struct bonding *bond = netdev_priv(bond_dev);
4524
4525 /* Release the bonded slaves */
4526 bond_release_all(bond_dev);
4527
4528 list_del(&bond->bond_list);
4529
4530 bond_work_cancel_all(bond);
4531
4532 bond_remove_proc_entry(bond);
4533
4534 if (bond->wq)
4535 destroy_workqueue(bond->wq);
4536
4537 netif_addr_lock_bh(bond_dev);
4538 bond_mc_list_destroy(bond);
4539 netif_addr_unlock_bh(bond_dev);
4540}
4541
4542/*------------------------- Module initialization ---------------------------*/
4543
4544/*
4545 * Convert string input module parms. Accept either the
4546 * number of the mode or its string name. A bit complicated because
4547 * some mode names are substrings of other names, and calls from sysfs
4548 * may have whitespace in the name (trailing newlines, for example).
4549 */
4550int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4551{
4552 int modeint = -1, i, rv;
4553 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4554
4555 for (p = (char *)buf; *p; p++)
4556 if (!(isdigit(*p) || isspace(*p)))
4557 break;
4558
4559 if (*p)
4560 rv = sscanf(buf, "%20s", modestr);
4561 else
4562 rv = sscanf(buf, "%d", &modeint);
4563
4564 if (!rv)
4565 return -1;
4566
4567 for (i = 0; tbl[i].modename; i++) {
4568 if (modeint == tbl[i].mode)
4569 return tbl[i].mode;
4570 if (strcmp(modestr, tbl[i].modename) == 0)
4571 return tbl[i].mode;
4572 }
4573
4574 return -1;
4575}
4576
4577static int bond_check_params(struct bond_params *params)
4578{
4579 int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4580
4581 /*
4582 * Convert string parameters.
4583 */
4584 if (mode) {
4585 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4586 if (bond_mode == -1) {
4587 pr_err("Error: Invalid bonding mode \"%s\"\n",
4588 mode == NULL ? "NULL" : mode);
4589 return -EINVAL;
4590 }
4591 }
4592
4593 if (xmit_hash_policy) {
4594 if ((bond_mode != BOND_MODE_XOR) &&
4595 (bond_mode != BOND_MODE_8023AD)) {
4596 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4597 bond_mode_name(bond_mode));
4598 } else {
4599 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4600 xmit_hashtype_tbl);
4601 if (xmit_hashtype == -1) {
4602 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4603 xmit_hash_policy == NULL ? "NULL" :
4604 xmit_hash_policy);
4605 return -EINVAL;
4606 }
4607 }
4608 }
4609
4610 if (lacp_rate) {
4611 if (bond_mode != BOND_MODE_8023AD) {
4612 pr_info("lacp_rate param is irrelevant in mode %s\n",
4613 bond_mode_name(bond_mode));
4614 } else {
4615 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4616 if (lacp_fast == -1) {
4617 pr_err("Error: Invalid lacp rate \"%s\"\n",
4618 lacp_rate == NULL ? "NULL" : lacp_rate);
4619 return -EINVAL;
4620 }
4621 }
4622 }
4623
4624 if (ad_select) {
4625 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4626 if (params->ad_select == -1) {
4627 pr_err("Error: Invalid ad_select \"%s\"\n",
4628 ad_select == NULL ? "NULL" : ad_select);
4629 return -EINVAL;
4630 }
4631
4632 if (bond_mode != BOND_MODE_8023AD) {
4633 pr_warning("ad_select param only affects 802.3ad mode\n");
4634 }
4635 } else {
4636 params->ad_select = BOND_AD_STABLE;
4637 }
4638
4639 if (max_bonds < 0) {
4640 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4641 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4642 max_bonds = BOND_DEFAULT_MAX_BONDS;
4643 }
4644
4645 if (miimon < 0) {
4646 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4647 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4648 miimon = BOND_LINK_MON_INTERV;
4649 }
4650
4651 if (updelay < 0) {
4652 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4653 updelay, INT_MAX);
4654 updelay = 0;
4655 }
4656
4657 if (downdelay < 0) {
4658 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4659 downdelay, INT_MAX);
4660 downdelay = 0;
4661 }
4662
4663 if ((use_carrier != 0) && (use_carrier != 1)) {
4664 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4665 use_carrier);
4666 use_carrier = 1;
4667 }
4668
4669 if (num_grat_arp < 0 || num_grat_arp > 255) {
4670 pr_warning("Warning: num_grat_arp (%d) not in range 0-255 so it was reset to 1 \n",
4671 num_grat_arp);
4672 num_grat_arp = 1;
4673 }
4674
4675 if (num_unsol_na < 0 || num_unsol_na > 255) {
4676 pr_warning("Warning: num_unsol_na (%d) not in range 0-255 so it was reset to 1 \n",
4677 num_unsol_na);
4678 num_unsol_na = 1;
4679 }
4680
4681 /* reset values for 802.3ad */
4682 if (bond_mode == BOND_MODE_8023AD) {
4683 if (!miimon) {
4684 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4685 pr_warning("Forcing miimon to 100msec\n");
4686 miimon = 100;
4687 }
4688 }
4689
4690 /* reset values for TLB/ALB */
4691 if ((bond_mode == BOND_MODE_TLB) ||
4692 (bond_mode == BOND_MODE_ALB)) {
4693 if (!miimon) {
4694 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure and link speed which are essential for TLB/ALB load balancing\n");
4695 pr_warning("Forcing miimon to 100msec\n");
4696 miimon = 100;
4697 }
4698 }
4699
4700 if (bond_mode == BOND_MODE_ALB) {
4701 pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
4702 updelay);
4703 }
4704
4705 if (!miimon) {
4706 if (updelay || downdelay) {
4707 /* just warn the user the up/down delay will have
4708 * no effect since miimon is zero...
4709 */
4710 pr_warning("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
4711 updelay, downdelay);
4712 }
4713 } else {
4714 /* don't allow arp monitoring */
4715 if (arp_interval) {
4716 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4717 miimon, arp_interval);
4718 arp_interval = 0;
4719 }
4720
4721 if ((updelay % miimon) != 0) {
4722 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4723 updelay, miimon,
4724 (updelay / miimon) * miimon);
4725 }
4726
4727 updelay /= miimon;
4728
4729 if ((downdelay % miimon) != 0) {
4730 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4731 downdelay, miimon,
4732 (downdelay / miimon) * miimon);
4733 }
4734
4735 downdelay /= miimon;
4736 }
4737
4738 if (arp_interval < 0) {
4739 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4740 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4741 arp_interval = BOND_LINK_ARP_INTERV;
4742 }
4743
4744 for (arp_ip_count = 0;
4745 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4746 arp_ip_count++) {
4747 /* not complete check, but should be good enough to
4748 catch mistakes */
4749 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4750 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4751 arp_ip_target[arp_ip_count]);
4752 arp_interval = 0;
4753 } else {
4754 __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4755 arp_target[arp_ip_count] = ip;
4756 }
4757 }
4758
4759 if (arp_interval && !arp_ip_count) {
4760 /* don't allow arping if no arp_ip_target given... */
4761 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4762 arp_interval);
4763 arp_interval = 0;
4764 }
4765
4766 if (arp_validate) {
4767 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4768 pr_err("arp_validate only supported in active-backup mode\n");
4769 return -EINVAL;
4770 }
4771 if (!arp_interval) {
4772 pr_err("arp_validate requires arp_interval\n");
4773 return -EINVAL;
4774 }
4775
4776 arp_validate_value = bond_parse_parm(arp_validate,
4777 arp_validate_tbl);
4778 if (arp_validate_value == -1) {
4779 pr_err("Error: invalid arp_validate \"%s\"\n",
4780 arp_validate == NULL ? "NULL" : arp_validate);
4781 return -EINVAL;
4782 }
4783 } else
4784 arp_validate_value = 0;
4785
4786 if (miimon) {
4787 pr_info("MII link monitoring set to %d ms\n", miimon);
4788 } else if (arp_interval) {
4789 int i;
4790
4791 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4792 arp_interval,
4793 arp_validate_tbl[arp_validate_value].modename,
4794 arp_ip_count);
4795
4796 for (i = 0; i < arp_ip_count; i++)
4797 pr_info(" %s", arp_ip_target[i]);
4798
4799 pr_info("\n");
4800
4801 } else if (max_bonds) {
4802 /* miimon and arp_interval not set, we need one so things
4803 * work as expected, see bonding.txt for details
4804 */
4805 pr_warning("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details.\n");
4806 }
4807
4808 if (primary && !USES_PRIMARY(bond_mode)) {
4809 /* currently, using a primary only makes sense
4810 * in active backup, TLB or ALB modes
4811 */
4812 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4813 primary, bond_mode_name(bond_mode));
4814 primary = NULL;
4815 }
4816
4817 if (primary && primary_reselect) {
4818 primary_reselect_value = bond_parse_parm(primary_reselect,
4819 pri_reselect_tbl);
4820 if (primary_reselect_value == -1) {
4821 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4822 primary_reselect ==
4823 NULL ? "NULL" : primary_reselect);
4824 return -EINVAL;
4825 }
4826 } else {
4827 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4828 }
4829
4830 if (fail_over_mac) {
4831 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4832 fail_over_mac_tbl);
4833 if (fail_over_mac_value == -1) {
4834 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4835 arp_validate == NULL ? "NULL" : arp_validate);
4836 return -EINVAL;
4837 }
4838
4839 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4840 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4841 } else {
4842 fail_over_mac_value = BOND_FOM_NONE;
4843 }
4844
4845 /* fill params struct with the proper values */
4846 params->mode = bond_mode;
4847 params->xmit_policy = xmit_hashtype;
4848 params->miimon = miimon;
4849 params->num_grat_arp = num_grat_arp;
4850 params->num_unsol_na = num_unsol_na;
4851 params->arp_interval = arp_interval;
4852 params->arp_validate = arp_validate_value;
4853 params->updelay = updelay;
4854 params->downdelay = downdelay;
4855 params->use_carrier = use_carrier;
4856 params->lacp_fast = lacp_fast;
4857 params->primary[0] = 0;
4858 params->primary_reselect = primary_reselect_value;
4859 params->fail_over_mac = fail_over_mac_value;
4860
4861 if (primary) {
4862 strncpy(params->primary, primary, IFNAMSIZ);
4863 params->primary[IFNAMSIZ - 1] = 0;
4864 }
4865
4866 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4867
4868 return 0;
4869}
4870
4871static struct lock_class_key bonding_netdev_xmit_lock_key;
4872static struct lock_class_key bonding_netdev_addr_lock_key;
4873
4874static void bond_set_lockdep_class_one(struct net_device *dev,
4875 struct netdev_queue *txq,
4876 void *_unused)
4877{
4878 lockdep_set_class(&txq->_xmit_lock,
4879 &bonding_netdev_xmit_lock_key);
4880}
4881
4882static void bond_set_lockdep_class(struct net_device *dev)
4883{
4884 lockdep_set_class(&dev->addr_list_lock,
4885 &bonding_netdev_addr_lock_key);
4886 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4887}
4888
4889/*
4890 * Called from registration process
4891 */
4892static int bond_init(struct net_device *bond_dev)
4893{
4894 struct bonding *bond = netdev_priv(bond_dev);
4895 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4896
4897 pr_debug("Begin bond_init for %s\n", bond_dev->name);
4898
4899 bond->wq = create_singlethread_workqueue(bond_dev->name);
4900 if (!bond->wq)
4901 return -ENOMEM;
4902
4903 bond_set_lockdep_class(bond_dev);
4904
4905 netif_carrier_off(bond_dev);
4906
4907 bond_create_proc_entry(bond);
4908 list_add_tail(&bond->bond_list, &bn->dev_list);
4909
4910 bond_prepare_sysfs_group(bond);
4911 return 0;
4912}
4913
4914static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4915{
4916 if (tb[IFLA_ADDRESS]) {
4917 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4918 return -EINVAL;
4919 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4920 return -EADDRNOTAVAIL;
4921 }
4922 return 0;
4923}
4924
4925static struct rtnl_link_ops bond_link_ops __read_mostly = {
4926 .kind = "bond",
4927 .priv_size = sizeof(struct bonding),
4928 .setup = bond_setup,
4929 .validate = bond_validate,
4930};
4931
4932/* Create a new bond based on the specified name and bonding parameters.
4933 * If name is NULL, obtain a suitable "bond%d" name for us.
4934 * Caller must NOT hold rtnl_lock; we need to release it here before we
4935 * set up our sysfs entries.
4936 */
4937int bond_create(struct net *net, const char *name)
4938{
4939 struct net_device *bond_dev;
4940 int res;
4941
4942 rtnl_lock();
4943
4944 bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
4945 bond_setup);
4946 if (!bond_dev) {
4947 pr_err("%s: eek! can't alloc netdev!\n", name);
4948 res = -ENOMEM;
4949 goto out;
4950 }
4951
4952 dev_net_set(bond_dev, net);
4953 bond_dev->rtnl_link_ops = &bond_link_ops;
4954
4955 if (!name) {
4956 res = dev_alloc_name(bond_dev, "bond%d");
4957 if (res < 0)
4958 goto out_netdev;
4959 }
4960
4961 res = register_netdevice(bond_dev);
4962 if (res < 0)
4963 goto out_netdev;
4964
4965out:
4966 rtnl_unlock();
4967 return res;
4968out_netdev:
4969 free_netdev(bond_dev);
4970 goto out;
4971}
4972
4973static int __net_init bond_net_init(struct net *net)
4974{
4975 struct bond_net *bn = net_generic(net, bond_net_id);
4976
4977 bn->net = net;
4978 INIT_LIST_HEAD(&bn->dev_list);
4979
4980 bond_create_proc_dir(bn);
4981
4982 return 0;
4983}
4984
4985static void __net_exit bond_net_exit(struct net *net)
4986{
4987 struct bond_net *bn = net_generic(net, bond_net_id);
4988
4989 bond_destroy_proc_dir(bn);
4990}
4991
4992static struct pernet_operations bond_net_ops = {
4993 .init = bond_net_init,
4994 .exit = bond_net_exit,
4995 .id = &bond_net_id,
4996 .size = sizeof(struct bond_net),
4997};
4998
4999static int __init bonding_init(void)
5000{
5001 int i;
5002 int res;
5003
5004 pr_info("%s", version);
5005
5006 res = bond_check_params(&bonding_defaults);
5007 if (res)
5008 goto out;
5009
5010 res = register_pernet_subsys(&bond_net_ops);
5011 if (res)
5012 goto out;
5013
5014 res = rtnl_link_register(&bond_link_ops);
5015 if (res)
5016 goto err_link;
5017
5018 for (i = 0; i < max_bonds; i++) {
5019 res = bond_create(&init_net, NULL);
5020 if (res)
5021 goto err;
5022 }
5023
5024 res = bond_create_sysfs();
5025 if (res)
5026 goto err;
5027
5028 register_netdevice_notifier(&bond_netdev_notifier);
5029 register_inetaddr_notifier(&bond_inetaddr_notifier);
5030 bond_register_ipv6_notifier();
5031out:
5032 return res;
5033err:
5034 rtnl_link_unregister(&bond_link_ops);
5035err_link:
5036 unregister_pernet_subsys(&bond_net_ops);
5037 goto out;
5038
5039}
5040
5041static void __exit bonding_exit(void)
5042{
5043 unregister_netdevice_notifier(&bond_netdev_notifier);
5044 unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5045 bond_unregister_ipv6_notifier();
5046
5047 bond_destroy_sysfs();
5048
5049 rtnl_link_unregister(&bond_link_ops);
5050 unregister_pernet_subsys(&bond_net_ops);
5051}
5052
5053module_init(bonding_init);
5054module_exit(bonding_exit);
5055MODULE_LICENSE("GPL");
5056MODULE_VERSION(DRV_VERSION);
5057MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5058MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5059MODULE_ALIAS_RTNL_LINK("bond");
Clone of davem's net-next-2.6 tree