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bonding: Rework / fix multiple gratuitous ARP support
[net-next-2.6.git] / drivers / net / bonding / bond_main.c
CommitLineData
1da177e4
LT		 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 *
1da177e4
LT		 32 */
33
34//#define BONDING_DEBUG 1
35
1da177e4
LT		 36#include <linux/kernel.h>
37#include <linux/module.h>
1da177e4
LT		 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>
169a3e66 44#include <net/ip.h>
1da177e4 45#include <linux/ip.h>
169a3e66
JV		 46#include <linux/tcp.h>
47#include <linux/udp.h>
1da177e4
LT		 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 <asm/system.h>
57#include <asm/io.h>
58#include <asm/dma.h>
59#include <asm/uaccess.h>
60#include <linux/errno.h>
61#include <linux/netdevice.h>
62#include <linux/inetdevice.h>
a816c7c7 63#include <linux/igmp.h>
1da177e4
LT		 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>
b63bb739 77#include <linux/jiffies.h>
c3ade5ca 78#include <net/route.h>
457c4cbc 79#include <net/net_namespace.h>
1da177e4
LT		 80#include "bonding.h"
81#include "bond_3ad.h"
82#include "bond_alb.h"
83
84/*---------------------------- Module parameters ----------------------------*/
85
86/* monitor all links that often (in milliseconds). <=0 disables monitoring */
87#define BOND_LINK_MON_INTERV 0
88#define BOND_LINK_ARP_INTERV 0
89
90static int max_bonds = BOND_DEFAULT_MAX_BONDS;
7893b249 91static int num_grat_arp = 1;
1da177e4
LT		 92static int miimon = BOND_LINK_MON_INTERV;
93static int updelay = 0;
94static int downdelay = 0;
95static int use_carrier = 1;
96static char *mode = NULL;
97static char *primary = NULL;
98static char *lacp_rate = NULL;
169a3e66 99static char *xmit_hash_policy = NULL;
1da177e4
LT		 100static int arp_interval = BOND_LINK_ARP_INTERV;
101static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
f5b2b966 102static char *arp_validate = NULL;
3915c1e8 103static char *fail_over_mac = NULL;
12479f9a 104struct bond_params bonding_defaults;
1da177e4
LT		 105
106module_param(max_bonds, int, 0);
107MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
7893b249
MS		 108module_param(num_grat_arp, int, 0644);
109MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
1da177e4
LT		 110module_param(miimon, int, 0);
111MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
112module_param(updelay, int, 0);
113MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
114module_param(downdelay, int, 0);
2ac47660
MW		 115MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
116 "in milliseconds");
1da177e4 117module_param(use_carrier, int, 0);
2ac47660
MW		 118MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
119 "0 for off, 1 for on (default)");
1da177e4 120module_param(mode, charp, 0);
2ac47660
MW		 121MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
122 "1 for active-backup, 2 for balance-xor, "
123 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
124 "6 for balance-alb");
1da177e4
LT		 125module_param(primary, charp, 0);
126MODULE_PARM_DESC(primary, "Primary network device to use");
127module_param(lacp_rate, charp, 0);
2ac47660
MW		 128MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
129 "(slow/fast)");
169a3e66 130module_param(xmit_hash_policy, charp, 0);
2ac47660
MW		 131MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
132 ", 1 for layer 3+4");
1da177e4
LT		 133module_param(arp_interval, int, 0);
134MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
135module_param_array(arp_ip_target, charp, NULL, 0);
136MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
f5b2b966
JV		 137module_param(arp_validate, charp, 0);
138MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
3915c1e8
JV		 139module_param(fail_over_mac, charp, 0);
140MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC. none (default), active or follow");
1da177e4
LT		 141
142/*----------------------------- Global variables ----------------------------*/
143
f71e1309 144static const char * const version =
1da177e4
LT		 145 DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
146
12479f9a 147LIST_HEAD(bond_dev_list);
1da177e4
LT		 148
149#ifdef CONFIG_PROC_FS
150static struct proc_dir_entry *bond_proc_dir = NULL;
151#endif
152
b76cdba9 153extern struct rw_semaphore bonding_rwsem;
d3bb52b0 154static __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
1da177e4 155static int arp_ip_count = 0;
1da177e4 156static int bond_mode = BOND_MODE_ROUNDROBIN;
169a3e66 157static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
1da177e4 158static int lacp_fast = 0;
217df670 159
1da177e4 160
12479f9a 161struct bond_parm_tbl bond_lacp_tbl[] = {
1da177e4
LT		 162{ "slow", AD_LACP_SLOW},
163{ "fast", AD_LACP_FAST},
164{ NULL, -1},
165};
166
12479f9a 167struct bond_parm_tbl bond_mode_tbl[] = {
1da177e4
LT		 168{ "balance-rr", BOND_MODE_ROUNDROBIN},
169{ "active-backup", BOND_MODE_ACTIVEBACKUP},
170{ "balance-xor", BOND_MODE_XOR},
171{ "broadcast", BOND_MODE_BROADCAST},
172{ "802.3ad", BOND_MODE_8023AD},
173{ "balance-tlb", BOND_MODE_TLB},
174{ "balance-alb", BOND_MODE_ALB},
175{ NULL, -1},
176};
177
12479f9a 178struct bond_parm_tbl xmit_hashtype_tbl[] = {
169a3e66
JV		 179{ "layer2", BOND_XMIT_POLICY_LAYER2},
180{ "layer3+4", BOND_XMIT_POLICY_LAYER34},
6f6652be 181{ "layer2+3", BOND_XMIT_POLICY_LAYER23},
169a3e66
JV		 182{ NULL, -1},
183};
184
f5b2b966
JV		 185struct bond_parm_tbl arp_validate_tbl[] = {
186{ "none", BOND_ARP_VALIDATE_NONE},
187{ "active", BOND_ARP_VALIDATE_ACTIVE},
188{ "backup", BOND_ARP_VALIDATE_BACKUP},
189{ "all", BOND_ARP_VALIDATE_ALL},
190{ NULL, -1},
191};
192
3915c1e8
JV		 193struct bond_parm_tbl fail_over_mac_tbl[] = {
194{ "none", BOND_FOM_NONE},
195{ "active", BOND_FOM_ACTIVE},
196{ "follow", BOND_FOM_FOLLOW},
197{ NULL, -1},
198};
199
1da177e4
LT		 200/*-------------------------- Forward declarations ---------------------------*/
201
c3ade5ca 202static void bond_send_gratuitous_arp(struct bonding *bond);
c50b85d0 203static void bond_deinit(struct net_device *bond_dev);
1da177e4
LT		 204
205/*---------------------------- General routines -----------------------------*/
206
4ad072c9 207static const char *bond_mode_name(int mode)
1da177e4
LT		 208{
209 switch (mode) {
210 case BOND_MODE_ROUNDROBIN :
211 return "load balancing (round-robin)";
212 case BOND_MODE_ACTIVEBACKUP :
213 return "fault-tolerance (active-backup)";
214 case BOND_MODE_XOR :
215 return "load balancing (xor)";
216 case BOND_MODE_BROADCAST :
217 return "fault-tolerance (broadcast)";
218 case BOND_MODE_8023AD:
219 return "IEEE 802.3ad Dynamic link aggregation";
220 case BOND_MODE_TLB:
221 return "transmit load balancing";
222 case BOND_MODE_ALB:
223 return "adaptive load balancing";
224 default:
225 return "unknown";
226 }
227}
228
229/*---------------------------------- VLAN -----------------------------------*/
230
231/**
232 * bond_add_vlan - add a new vlan id on bond
233 * @bond: bond that got the notification
234 * @vlan_id: the vlan id to add
235 *
236 * Returns -ENOMEM if allocation failed.
237 */
238static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
239{
240 struct vlan_entry *vlan;
241
242 dprintk("bond: %s, vlan id %d\n",
243 (bond ? bond->dev->name: "None"), vlan_id);
244
245 vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
246 if (!vlan) {
247 return -ENOMEM;
248 }
249
250 INIT_LIST_HEAD(&vlan->vlan_list);
251 vlan->vlan_id = vlan_id;
c3ade5ca 252 vlan->vlan_ip = 0;
1da177e4
LT		 253
254 write_lock_bh(&bond->lock);
255
256 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
257
258 write_unlock_bh(&bond->lock);
259
260 dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
261
262 return 0;
263}
264
265/**
266 * bond_del_vlan - delete a vlan id from bond
267 * @bond: bond that got the notification
268 * @vlan_id: the vlan id to delete
269 *
270 * returns -ENODEV if @vlan_id was not found in @bond.
271 */
272static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
273{
0883beca 274 struct vlan_entry *vlan;
1da177e4
LT		 275 int res = -ENODEV;
276
277 dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
278
279 write_lock_bh(&bond->lock);
280
0883beca 281 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
1da177e4
LT		 282 if (vlan->vlan_id == vlan_id) {
283 list_del(&vlan->vlan_list);
284
285 if ((bond->params.mode == BOND_MODE_TLB) ||
286 (bond->params.mode == BOND_MODE_ALB)) {
287 bond_alb_clear_vlan(bond, vlan_id);
288 }
289
290 dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
291 bond->dev->name);
292
293 kfree(vlan);
294
295 if (list_empty(&bond->vlan_list) &&
296 (bond->slave_cnt == 0)) {
297 /* Last VLAN removed and no slaves, so
298 * restore block on adding VLANs. This will
299 * be removed once new slaves that are not
300 * VLAN challenged will be added.
301 */
302 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
303 }
304
305 res = 0;
306 goto out;
307 }
308 }
309
310 dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
311 bond->dev->name);
312
313out:
314 write_unlock_bh(&bond->lock);
315 return res;
316}
317
318/**
319 * bond_has_challenged_slaves
320 * @bond: the bond we're working on
321 *
322 * Searches the slave list. Returns 1 if a vlan challenged slave
323 * was found, 0 otherwise.
324 *
325 * Assumes bond->lock is held.
326 */
327static int bond_has_challenged_slaves(struct bonding *bond)
328{
329 struct slave *slave;
330 int i;
331
332 bond_for_each_slave(bond, slave, i) {
333 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
334 dprintk("found VLAN challenged slave - %s\n",
335 slave->dev->name);
336 return 1;
337 }
338 }
339
340 dprintk("no VLAN challenged slaves found\n");
341 return 0;
342}
343
344/**
345 * bond_next_vlan - safely skip to the next item in the vlans list.
346 * @bond: the bond we're working on
347 * @curr: item we're advancing from
348 *
349 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
350 * or @curr->next otherwise (even if it is @curr itself again).
351 *
352 * Caller must hold bond->lock
353 */
354struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
355{
356 struct vlan_entry *next, *last;
357
358 if (list_empty(&bond->vlan_list)) {
359 return NULL;
360 }
361
362 if (!curr) {
363 next = list_entry(bond->vlan_list.next,
364 struct vlan_entry, vlan_list);
365 } else {
366 last = list_entry(bond->vlan_list.prev,
367 struct vlan_entry, vlan_list);
368 if (last == curr) {
369 next = list_entry(bond->vlan_list.next,
370 struct vlan_entry, vlan_list);
371 } else {
372 next = list_entry(curr->vlan_list.next,
373 struct vlan_entry, vlan_list);
374 }
375 }
376
377 return next;
378}
379
380/**
381 * bond_dev_queue_xmit - Prepare skb for xmit.
382 *
383 * @bond: bond device that got this skb for tx.
384 * @skb: hw accel VLAN tagged skb to transmit
385 * @slave_dev: slave that is supposed to xmit this skbuff
386 *
387 * When the bond gets an skb to transmit that is
388 * already hardware accelerated VLAN tagged, and it
389 * needs to relay this skb to a slave that is not
390 * hw accel capable, the skb needs to be "unaccelerated",
391 * i.e. strip the hwaccel tag and re-insert it as part
392 * of the payload.
393 */
394int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
395{
966bc6f4 396 unsigned short uninitialized_var(vlan_id);
1da177e4
LT		 397
398 if (!list_empty(&bond->vlan_list) &&
399 !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
400 vlan_get_tag(skb, &vlan_id) == 0) {
401 skb->dev = slave_dev;
402 skb = vlan_put_tag(skb, vlan_id);
403 if (!skb) {
404 /* vlan_put_tag() frees the skb in case of error,
405 * so return success here so the calling functions
406 * won't attempt to free is again.
407 */
408 return 0;
409 }
410 } else {
411 skb->dev = slave_dev;
412 }
413
414 skb->priority = 1;
415 dev_queue_xmit(skb);
416
417 return 0;
418}
419
420/*
421 * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
422 * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
423 * lock because:
424 * a. This operation is performed in IOCTL context,
425 * b. The operation is protected by the RTNL semaphore in the 8021q code,
426 * c. Holding a lock with BH disabled while directly calling a base driver
427 * entry point is generally a BAD idea.
428 *
429 * The design of synchronization/protection for this operation in the 8021q
430 * module is good for one or more VLAN devices over a single physical device
431 * and cannot be extended for a teaming solution like bonding, so there is a
432 * potential race condition here where a net device from the vlan group might
433 * be referenced (either by a base driver or the 8021q code) while it is being
434 * removed from the system. However, it turns out we're not making matters
435 * worse, and if it works for regular VLAN usage it will work here too.
436*/
437
438/**
439 * bond_vlan_rx_register - Propagates registration to slaves
440 * @bond_dev: bonding net device that got called
441 * @grp: vlan group being registered
442 */
443static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
444{
445 struct bonding *bond = bond_dev->priv;
446 struct slave *slave;
447 int i;
448
449 bond->vlgrp = grp;
450
451 bond_for_each_slave(bond, slave, i) {
452 struct net_device *slave_dev = slave->dev;
453
454 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
455 slave_dev->vlan_rx_register) {
456 slave_dev->vlan_rx_register(slave_dev, grp);
457 }
458 }
459}
460
461/**
462 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
463 * @bond_dev: bonding net device that got called
464 * @vid: vlan id being added
465 */
466static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
467{
468 struct bonding *bond = bond_dev->priv;
469 struct slave *slave;
470 int i, res;
471
472 bond_for_each_slave(bond, slave, i) {
473 struct net_device *slave_dev = slave->dev;
474
475 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
476 slave_dev->vlan_rx_add_vid) {
477 slave_dev->vlan_rx_add_vid(slave_dev, vid);
478 }
479 }
480
481 res = bond_add_vlan(bond, vid);
482 if (res) {
483 printk(KERN_ERR DRV_NAME
4e0952c7 484 ": %s: Error: Failed to add vlan id %d\n",
1da177e4
LT		 485 bond_dev->name, vid);
486 }
487}
488
489/**
490 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
491 * @bond_dev: bonding net device that got called
492 * @vid: vlan id being removed
493 */
494static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
495{
496 struct bonding *bond = bond_dev->priv;
497 struct slave *slave;
498 struct net_device *vlan_dev;
499 int i, res;
500
501 bond_for_each_slave(bond, slave, i) {
502 struct net_device *slave_dev = slave->dev;
503
504 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
505 slave_dev->vlan_rx_kill_vid) {
506 /* Save and then restore vlan_dev in the grp array,
507 * since the slave's driver might clear it.
508 */
5c15bdec 509 vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
1da177e4 510 slave_dev->vlan_rx_kill_vid(slave_dev, vid);
5c15bdec 511 vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
1da177e4
LT		 512 }
513 }
514
515 res = bond_del_vlan(bond, vid);
516 if (res) {
517 printk(KERN_ERR DRV_NAME
4e0952c7 518 ": %s: Error: Failed to remove vlan id %d\n",
1da177e4
LT		 519 bond_dev->name, vid);
520 }
521}
522
523static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
524{
525 struct vlan_entry *vlan;
526
527 write_lock_bh(&bond->lock);
528
529 if (list_empty(&bond->vlan_list)) {
530 goto out;
531 }
532
533 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
534 slave_dev->vlan_rx_register) {
535 slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
536 }
537
538 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
539 !(slave_dev->vlan_rx_add_vid)) {
540 goto out;
541 }
542
543 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
544 slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
545 }
546
547out:
548 write_unlock_bh(&bond->lock);
549}
550
551static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
552{
553 struct vlan_entry *vlan;
554 struct net_device *vlan_dev;
555
556 write_lock_bh(&bond->lock);
557
558 if (list_empty(&bond->vlan_list)) {
559 goto out;
560 }
561
562 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
563 !(slave_dev->vlan_rx_kill_vid)) {
564 goto unreg;
565 }
566
567 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
568 /* Save and then restore vlan_dev in the grp array,
569 * since the slave's driver might clear it.
570 */
5c15bdec 571 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
1da177e4 572 slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
5c15bdec 573 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
1da177e4
LT		 574 }
575
576unreg:
577 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
578 slave_dev->vlan_rx_register) {
579 slave_dev->vlan_rx_register(slave_dev, NULL);
580 }
581
582out:
583 write_unlock_bh(&bond->lock);
584}
585
586/*------------------------------- Link status -------------------------------*/
587
ff59c456
JV		 588/*
589 * Set the carrier state for the master according to the state of its
590 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
591 * do special 802.3ad magic.
592 *
593 * Returns zero if carrier state does not change, nonzero if it does.
594 */
595static int bond_set_carrier(struct bonding *bond)
596{
597 struct slave *slave;
598 int i;
599
600 if (bond->slave_cnt == 0)
601 goto down;
602
603 if (bond->params.mode == BOND_MODE_8023AD)
604 return bond_3ad_set_carrier(bond);
605
606 bond_for_each_slave(bond, slave, i) {
607 if (slave->link == BOND_LINK_UP) {
608 if (!netif_carrier_ok(bond->dev)) {
609 netif_carrier_on(bond->dev);
610 return 1;
611 }
612 return 0;
613 }
614 }
615
616down:
617 if (netif_carrier_ok(bond->dev)) {
618 netif_carrier_off(bond->dev);
619 return 1;
620 }
621 return 0;
622}
623
1da177e4
LT		 624/*
625 * Get link speed and duplex from the slave's base driver
626 * using ethtool. If for some reason the call fails or the
627 * values are invalid, fake speed and duplex to 100/Full
628 * and return error.
629 */
630static int bond_update_speed_duplex(struct slave *slave)
631{
632 struct net_device *slave_dev = slave->dev;
1da177e4 633 struct ethtool_cmd etool;
61a44b9c 634 int res;
1da177e4
LT		 635
636 /* Fake speed and duplex */
637 slave->speed = SPEED_100;
638 slave->duplex = DUPLEX_FULL;
639
61a44b9c
MW		 640 if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
641 return -1;
1da177e4 642
61a44b9c
MW		 643 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
644 if (res < 0)
1da177e4 645 return -1;
1da177e4 646
1da177e4
LT		 647 switch (etool.speed) {
648 case SPEED_10:
649 case SPEED_100:
650 case SPEED_1000:
94dbffd5 651 case SPEED_10000:
1da177e4
LT		 652 break;
653 default:
654 return -1;
655 }
656
657 switch (etool.duplex) {
658 case DUPLEX_FULL:
659 case DUPLEX_HALF:
660 break;
661 default:
662 return -1;
663 }
664
665 slave->speed = etool.speed;
666 slave->duplex = etool.duplex;
667
668 return 0;
669}
670
671/*
672 * if <dev> supports MII link status reporting, check its link status.
673 *
674 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
675 * depening upon the setting of the use_carrier parameter.
676 *
677 * Return either BMSR_LSTATUS, meaning that the link is up (or we
678 * can't tell and just pretend it is), or 0, meaning that the link is
679 * down.
680 *
681 * If reporting is non-zero, instead of faking link up, return -1 if
682 * both ETHTOOL and MII ioctls fail (meaning the device does not
683 * support them). If use_carrier is set, return whatever it says.
684 * It'd be nice if there was a good way to tell if a driver supports
685 * netif_carrier, but there really isn't.
686 */
687static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
688{
689 static int (* ioctl)(struct net_device *, struct ifreq *, int);
690 struct ifreq ifr;
691 struct mii_ioctl_data *mii;
1da177e4
LT		 692
693 if (bond->params.use_carrier) {
694 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
695 }
696
697 ioctl = slave_dev->do_ioctl;
698 if (ioctl) {
699 /* TODO: set pointer to correct ioctl on a per team member */
700 /* bases to make this more efficient. that is, once */
701 /* we determine the correct ioctl, we will always */
702 /* call it and not the others for that team */
703 /* member. */
704
705 /*
706 * We cannot assume that SIOCGMIIPHY will also read a
707 * register; not all network drivers (e.g., e100)
708 * support that.
709 */
710
711 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
712 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
713 mii = if_mii(&ifr);
714 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
715 mii->reg_num = MII_BMSR;
716 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
717 return (mii->val_out & BMSR_LSTATUS);
718 }
719 }
720 }
721
61a44b9c
MW		 722 /*
723 * Some drivers cache ETHTOOL_GLINK for a period of time so we only
724 * attempt to get link status from it if the above MII ioctls fail.
725 */
1da177e4
LT		 726 if (slave_dev->ethtool_ops) {
727 if (slave_dev->ethtool_ops->get_link) {
728 u32 link;
729
730 link = slave_dev->ethtool_ops->get_link(slave_dev);
731
732 return link ? BMSR_LSTATUS : 0;
733 }
734 }
735
1da177e4
LT		 736 /*
737 * If reporting, report that either there's no dev->do_ioctl,
61a44b9c 738 * or both SIOCGMIIREG and get_link failed (meaning that we
1da177e4
LT		 739 * cannot report link status). If not reporting, pretend
740 * we're ok.
741 */
742 return (reporting ? -1 : BMSR_LSTATUS);
743}
744
745/*----------------------------- Multicast list ------------------------------*/
746
747/*
748 * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
749 */
750static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
751{
752 return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
753 dmi1->dmi_addrlen == dmi2->dmi_addrlen;
754}
755
756/*
757 * returns dmi entry if found, NULL otherwise
758 */
759static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
760{
761 struct dev_mc_list *idmi;
762
763 for (idmi = mc_list; idmi; idmi = idmi->next) {
764 if (bond_is_dmi_same(dmi, idmi)) {
765 return idmi;
766 }
767 }
768
769 return NULL;
770}
771
772/*
773 * Push the promiscuity flag down to appropriate slaves
774 */
775static void bond_set_promiscuity(struct bonding *bond, int inc)
776{
777 if (USES_PRIMARY(bond->params.mode)) {
778 /* write lock already acquired */
779 if (bond->curr_active_slave) {
780 dev_set_promiscuity(bond->curr_active_slave->dev, inc);
781 }
782 } else {
783 struct slave *slave;
784 int i;
785 bond_for_each_slave(bond, slave, i) {
786 dev_set_promiscuity(slave->dev, inc);
787 }
788 }
789}
790
791/*
792 * Push the allmulti flag down to all slaves
793 */
794static void bond_set_allmulti(struct bonding *bond, int inc)
795{
796 if (USES_PRIMARY(bond->params.mode)) {
797 /* write lock already acquired */
798 if (bond->curr_active_slave) {
799 dev_set_allmulti(bond->curr_active_slave->dev, inc);
800 }
801 } else {
802 struct slave *slave;
803 int i;
804 bond_for_each_slave(bond, slave, i) {
805 dev_set_allmulti(slave->dev, inc);
806 }
807 }
808}
809
810/*
811 * Add a Multicast address to slaves
812 * according to mode
813 */
814static void bond_mc_add(struct bonding *bond, void *addr, int alen)
815{
816 if (USES_PRIMARY(bond->params.mode)) {
817 /* write lock already acquired */
818 if (bond->curr_active_slave) {
819 dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
820 }
821 } else {
822 struct slave *slave;
823 int i;
824 bond_for_each_slave(bond, slave, i) {
825 dev_mc_add(slave->dev, addr, alen, 0);
826 }
827 }
828}
829
830/*
831 * Remove a multicast address from slave
832 * according to mode
833 */
834static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
835{
836 if (USES_PRIMARY(bond->params.mode)) {
837 /* write lock already acquired */
838 if (bond->curr_active_slave) {
839 dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
840 }
841 } else {
842 struct slave *slave;
843 int i;
844 bond_for_each_slave(bond, slave, i) {
845 dev_mc_delete(slave->dev, addr, alen, 0);
846 }
847 }
848}
849
a816c7c7
JV		 850
851/*
852 * Retrieve the list of registered multicast addresses for the bonding
853 * device and retransmit an IGMP JOIN request to the current active
854 * slave.
855 */
856static void bond_resend_igmp_join_requests(struct bonding *bond)
857{
858 struct in_device *in_dev;
859 struct ip_mc_list *im;
860
861 rcu_read_lock();
862 in_dev = __in_dev_get_rcu(bond->dev);
863 if (in_dev) {
864 for (im = in_dev->mc_list; im; im = im->next) {
865 ip_mc_rejoin_group(im);
866 }
867 }
868
869 rcu_read_unlock();
870}
871
1da177e4
LT		 872/*
873 * Totally destroys the mc_list in bond
874 */
875static void bond_mc_list_destroy(struct bonding *bond)
876{
877 struct dev_mc_list *dmi;
878
879 dmi = bond->mc_list;
880 while (dmi) {
881 bond->mc_list = dmi->next;
882 kfree(dmi);
883 dmi = bond->mc_list;
884 }
a816c7c7 885 bond->mc_list = NULL;
1da177e4
LT		 886}
887
888/*
889 * Copy all the Multicast addresses from src to the bonding device dst
890 */
de54f390 891static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
dd0fc66f 892 gfp_t gfp_flag)
1da177e4
LT		 893{
894 struct dev_mc_list *dmi, *new_dmi;
895
896 for (dmi = mc_list; dmi; dmi = dmi->next) {
de54f390 897 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
1da177e4
LT		 898
899 if (!new_dmi) {
900 /* FIXME: Potential memory leak !!! */
901 return -ENOMEM;
902 }
903
904 new_dmi->next = bond->mc_list;
905 bond->mc_list = new_dmi;
906 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
907 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
908 new_dmi->dmi_users = dmi->dmi_users;
909 new_dmi->dmi_gusers = dmi->dmi_gusers;
910 }
911
912 return 0;
913}
914
915/*
916 * flush all members of flush->mc_list from device dev->mc_list
917 */
918static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
919{
920 struct bonding *bond = bond_dev->priv;
921 struct dev_mc_list *dmi;
922
923 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
924 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
925 }
926
927 if (bond->params.mode == BOND_MODE_8023AD) {
928 /* del lacpdu mc addr from mc list */
929 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
930
931 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
932 }
933}
934
935/*--------------------------- Active slave change ---------------------------*/
936
937/*
938 * Update the mc list and multicast-related flags for the new and
939 * old active slaves (if any) according to the multicast mode, and
940 * promiscuous flags unconditionally.
941 */
942static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
943{
944 struct dev_mc_list *dmi;
945
946 if (!USES_PRIMARY(bond->params.mode)) {
947 /* nothing to do - mc list is already up-to-date on
948 * all slaves
949 */
950 return;
951 }
952
953 if (old_active) {
954 if (bond->dev->flags & IFF_PROMISC) {
955 dev_set_promiscuity(old_active->dev, -1);
956 }
957
958 if (bond->dev->flags & IFF_ALLMULTI) {
959 dev_set_allmulti(old_active->dev, -1);
960 }
961
962 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
963 dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
964 }
965 }
966
967 if (new_active) {
968 if (bond->dev->flags & IFF_PROMISC) {
969 dev_set_promiscuity(new_active->dev, 1);
970 }
971
972 if (bond->dev->flags & IFF_ALLMULTI) {
973 dev_set_allmulti(new_active->dev, 1);
974 }
975
976 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
977 dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
978 }
a816c7c7 979 bond_resend_igmp_join_requests(bond);
1da177e4
LT		 980 }
981}
982
3915c1e8
JV		 983/*
984 * bond_do_fail_over_mac
985 *
986 * Perform special MAC address swapping for fail_over_mac settings
987 *
988 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
989 */
990static void bond_do_fail_over_mac(struct bonding *bond,
991 struct slave *new_active,
992 struct slave *old_active)
993{
994 u8 tmp_mac[ETH_ALEN];
995 struct sockaddr saddr;
996 int rv;
997
998 switch (bond->params.fail_over_mac) {
999 case BOND_FOM_ACTIVE:
1000 if (new_active)
1001 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
1002 new_active->dev->addr_len);
1003 break;
1004 case BOND_FOM_FOLLOW:
1005 /*
1006 * if new_active && old_active, swap them
1007 * if just old_active, do nothing (going to no active slave)
1008 * if just new_active, set new_active to bond's MAC
1009 */
1010 if (!new_active)
1011 return;
1012
1013 write_unlock_bh(&bond->curr_slave_lock);
1014 read_unlock(&bond->lock);
1015
1016 if (old_active) {
1017 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
1018 memcpy(saddr.sa_data, old_active->dev->dev_addr,
1019 ETH_ALEN);
1020 saddr.sa_family = new_active->dev->type;
1021 } else {
1022 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
1023 saddr.sa_family = bond->dev->type;
1024 }
1025
1026 rv = dev_set_mac_address(new_active->dev, &saddr);
1027 if (rv) {
1028 printk(KERN_ERR DRV_NAME
1029 ": %s: Error %d setting MAC of slave %s\n",
1030 bond->dev->name, -rv, new_active->dev->name);
1031 goto out;
1032 }
1033
1034 if (!old_active)
1035 goto out;
1036
1037 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1038 saddr.sa_family = old_active->dev->type;
1039
1040 rv = dev_set_mac_address(old_active->dev, &saddr);
1041 if (rv)
1042 printk(KERN_ERR DRV_NAME
1043 ": %s: Error %d setting MAC of slave %s\n",
1044 bond->dev->name, -rv, new_active->dev->name);
1045out:
1046 read_lock(&bond->lock);
1047 write_lock_bh(&bond->curr_slave_lock);
1048 break;
1049 default:
1050 printk(KERN_ERR DRV_NAME
1051 ": %s: bond_do_fail_over_mac impossible: bad policy %d\n",
1052 bond->dev->name, bond->params.fail_over_mac);
1053 break;
1054 }
1055
1056}
1057
1058
1da177e4
LT		 1059/**
1060 * find_best_interface - select the best available slave to be the active one
1061 * @bond: our bonding struct
1062 *
1063 * Warning: Caller must hold curr_slave_lock for writing.
1064 */
1065static struct slave *bond_find_best_slave(struct bonding *bond)
1066{
1067 struct slave *new_active, *old_active;
1068 struct slave *bestslave = NULL;
1069 int mintime = bond->params.updelay;
1070 int i;
1071
1072 new_active = old_active = bond->curr_active_slave;
1073
1074 if (!new_active) { /* there were no active slaves left */
1075 if (bond->slave_cnt > 0) { /* found one slave */
1076 new_active = bond->first_slave;
1077 } else {
1078 return NULL; /* still no slave, return NULL */
1079 }
1080 }
1081
1082 /* first try the primary link; if arping, a link must tx/rx traffic
1083 * before it can be considered the curr_active_slave - also, we would skip
1084 * slaves between the curr_active_slave and primary_slave that may be up
1085 * and able to arp
1086 */
1087 if ((bond->primary_slave) &&
1088 (!bond->params.arp_interval) &&
1089 (IS_UP(bond->primary_slave->dev))) {
1090 new_active = bond->primary_slave;
1091 }
1092
1093 /* remember where to stop iterating over the slaves */
1094 old_active = new_active;
1095
1096 bond_for_each_slave_from(bond, new_active, i, old_active) {
1097 if (IS_UP(new_active->dev)) {
1098 if (new_active->link == BOND_LINK_UP) {
1099 return new_active;
1100 } else if (new_active->link == BOND_LINK_BACK) {
1101 /* link up, but waiting for stabilization */
1102 if (new_active->delay < mintime) {
1103 mintime = new_active->delay;
1104 bestslave = new_active;
1105 }
1106 }
1107 }
1108 }
1109
1110 return bestslave;
1111}
1112
1113/**
1114 * change_active_interface - change the active slave into the specified one
1115 * @bond: our bonding struct
1116 * @new: the new slave to make the active one
1117 *
1118 * Set the new slave to the bond's settings and unset them on the old
1119 * curr_active_slave.
1120 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1121 *
1122 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1123 * because it is apparently the best available slave we have, even though its
1124 * updelay hasn't timed out yet.
1125 *
3915c1e8
JV		 1126 * If new_active is not NULL, caller must hold bond->lock for read and
1127 * curr_slave_lock for write_bh.
1da177e4 1128 */
a77b5325 1129void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1da177e4
LT		 1130{
1131 struct slave *old_active = bond->curr_active_slave;
1132
1133 if (old_active == new_active) {
1134 return;
1135 }
1136
1137 if (new_active) {
b2220cad
JV		 1138 new_active->jiffies = jiffies;
1139
1da177e4
LT		 1140 if (new_active->link == BOND_LINK_BACK) {
1141 if (USES_PRIMARY(bond->params.mode)) {
1142 printk(KERN_INFO DRV_NAME
1143 ": %s: making interface %s the new "
1144 "active one %d ms earlier.\n",
1145 bond->dev->name, new_active->dev->name,
1146 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1147 }
1148
1149 new_active->delay = 0;
1150 new_active->link = BOND_LINK_UP;
1da177e4
LT		 1151
1152 if (bond->params.mode == BOND_MODE_8023AD) {
1153 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1154 }
1155
1156 if ((bond->params.mode == BOND_MODE_TLB) ||
1157 (bond->params.mode == BOND_MODE_ALB)) {
1158 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1159 }
1160 } else {
1161 if (USES_PRIMARY(bond->params.mode)) {
1162 printk(KERN_INFO DRV_NAME
1163 ": %s: making interface %s the new "
1164 "active one.\n",
1165 bond->dev->name, new_active->dev->name);
1166 }
1167 }
1168 }
1169
1da177e4
LT		 1170 if (USES_PRIMARY(bond->params.mode)) {
1171 bond_mc_swap(bond, new_active, old_active);
1172 }
1173
1174 if ((bond->params.mode == BOND_MODE_TLB) ||
1175 (bond->params.mode == BOND_MODE_ALB)) {
1176 bond_alb_handle_active_change(bond, new_active);
8f903c70
JV		 1177 if (old_active)
1178 bond_set_slave_inactive_flags(old_active);
1179 if (new_active)
1180 bond_set_slave_active_flags(new_active);
1da177e4
LT		 1181 } else {
1182 bond->curr_active_slave = new_active;
1183 }
c3ade5ca
JV		 1184
1185 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1186 if (old_active) {
1187 bond_set_slave_inactive_flags(old_active);
1188 }
1189
1190 if (new_active) {
1191 bond_set_slave_active_flags(new_active);
2ab82852 1192
709f8a45
OG		 1193 if (bond->params.fail_over_mac)
1194 bond_do_fail_over_mac(bond, new_active,
1195 old_active);
3915c1e8 1196
709f8a45 1197 bond->send_grat_arp = bond->params.num_grat_arp;
b59f9f74 1198 bond_send_gratuitous_arp(bond);
01f3109d
OG		 1199
1200 write_unlock_bh(&bond->curr_slave_lock);
1201 read_unlock(&bond->lock);
1202
1203 netdev_bonding_change(bond->dev);
1204
1205 read_lock(&bond->lock);
1206 write_lock_bh(&bond->curr_slave_lock);
7893b249 1207 }
c3ade5ca 1208 }
1da177e4
LT		 1209}
1210
1211/**
1212 * bond_select_active_slave - select a new active slave, if needed
1213 * @bond: our bonding struct
1214 *
1215 * This functions shoud be called when one of the following occurs:
1216 * - The old curr_active_slave has been released or lost its link.
1217 * - The primary_slave has got its link back.
1218 * - A slave has got its link back and there's no old curr_active_slave.
1219 *
3915c1e8 1220 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1da177e4 1221 */
a77b5325 1222void bond_select_active_slave(struct bonding *bond)
1da177e4
LT		 1223{
1224 struct slave *best_slave;
ff59c456 1225 int rv;
1da177e4
LT		 1226
1227 best_slave = bond_find_best_slave(bond);
1228 if (best_slave != bond->curr_active_slave) {
1229 bond_change_active_slave(bond, best_slave);
ff59c456
JV		 1230 rv = bond_set_carrier(bond);
1231 if (!rv)
1232 return;
1233
1234 if (netif_carrier_ok(bond->dev)) {
1235 printk(KERN_INFO DRV_NAME
1236 ": %s: first active interface up!\n",
1237 bond->dev->name);
1238 } else {
1239 printk(KERN_INFO DRV_NAME ": %s: "
1240 "now running without any active interface !\n",
1241 bond->dev->name);
1242 }
1da177e4
LT		 1243 }
1244}
1245
1246/*--------------------------- slave list handling ---------------------------*/
1247
1248/*
1249 * This function attaches the slave to the end of list.
1250 *
1251 * bond->lock held for writing by caller.
1252 */
1253static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1254{
1255 if (bond->first_slave == NULL) { /* attaching the first slave */
1256 new_slave->next = new_slave;
1257 new_slave->prev = new_slave;
1258 bond->first_slave = new_slave;
1259 } else {
1260 new_slave->next = bond->first_slave;
1261 new_slave->prev = bond->first_slave->prev;
1262 new_slave->next->prev = new_slave;
1263 new_slave->prev->next = new_slave;
1264 }
1265
1266 bond->slave_cnt++;
1267}
1268
1269/*
1270 * This function detaches the slave from the list.
1271 * WARNING: no check is made to verify if the slave effectively
1272 * belongs to <bond>.
1273 * Nothing is freed on return, structures are just unchained.
1274 * If any slave pointer in bond was pointing to <slave>,
1275 * it should be changed by the calling function.
1276 *
1277 * bond->lock held for writing by caller.
1278 */
1279static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1280{
1281 if (slave->next) {
1282 slave->next->prev = slave->prev;
1283 }
1284
1285 if (slave->prev) {
1286 slave->prev->next = slave->next;
1287 }
1288
1289 if (bond->first_slave == slave) { /* slave is the first slave */
1290 if (bond->slave_cnt > 1) { /* there are more slave */
1291 bond->first_slave = slave->next;
1292 } else {
1293 bond->first_slave = NULL; /* slave was the last one */
1294 }
1295 }
1296
1297 slave->next = NULL;
1298 slave->prev = NULL;
1299 bond->slave_cnt--;
1300}
1301
1302/*---------------------------------- IOCTL ----------------------------------*/
1303
4ad072c9
AB		 1304static int bond_sethwaddr(struct net_device *bond_dev,
1305 struct net_device *slave_dev)
1da177e4
LT		 1306{
1307 dprintk("bond_dev=%p\n", bond_dev);
1308 dprintk("slave_dev=%p\n", slave_dev);
1309 dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1310 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1311 return 0;
1312}
1313
7f353bf2
HX		 1314#define BOND_VLAN_FEATURES \
1315 (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1316 NETIF_F_HW_VLAN_FILTER)
8531c5ff
AK		 1317
1318/*
8e3babcd 1319 * Compute the common dev->feature set available to all slaves. Some
7f353bf2
HX		 1320 * feature bits are managed elsewhere, so preserve those feature bits
1321 * on the master device.
8531c5ff
AK		 1322 */
1323static int bond_compute_features(struct bonding *bond)
1324{
8531c5ff
AK		 1325 struct slave *slave;
1326 struct net_device *bond_dev = bond->dev;
7f353bf2 1327 unsigned long features = bond_dev->features;
3158bf7d
MS		 1328 unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1329 bond_dev->hard_header_len);
8e3babcd 1330 int i;
8531c5ff 1331
7f353bf2
HX		 1332 features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1333 features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
1334 NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1335
54ef3137 1336 bond_for_each_slave(bond, slave, i) {
7f353bf2
HX		 1337 features = netdev_compute_features(features,
1338 slave->dev->features);
54ef3137
JV		 1339 if (slave->dev->hard_header_len > max_hard_header_len)
1340 max_hard_header_len = slave->dev->hard_header_len;
1341 }
8531c5ff 1342
7f353bf2 1343 features |= (bond_dev->features & BOND_VLAN_FEATURES);
8531c5ff 1344 bond_dev->features = features;
54ef3137 1345 bond_dev->hard_header_len = max_hard_header_len;
8531c5ff
AK		 1346
1347 return 0;
1348}
1349
872254dd
MS		 1350
1351static void bond_setup_by_slave(struct net_device *bond_dev,
1352 struct net_device *slave_dev)
1353{
d90a162a
MS		 1354 struct bonding *bond = bond_dev->priv;
1355
872254dd 1356 bond_dev->neigh_setup = slave_dev->neigh_setup;
1284cd3a 1357 bond_dev->header_ops = slave_dev->header_ops;
872254dd
MS		 1358
1359 bond_dev->type = slave_dev->type;
1360 bond_dev->hard_header_len = slave_dev->hard_header_len;
1361 bond_dev->addr_len = slave_dev->addr_len;
1362
1363 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1364 slave_dev->addr_len);
d90a162a 1365 bond->setup_by_slave = 1;
872254dd
MS		 1366}
1367
1da177e4 1368/* enslave device <slave> to bond device <master> */
a77b5325 1369int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1da177e4
LT		 1370{
1371 struct bonding *bond = bond_dev->priv;
1372 struct slave *new_slave = NULL;
1373 struct dev_mc_list *dmi;
1374 struct sockaddr addr;
1375 int link_reporting;
1376 int old_features = bond_dev->features;
1377 int res = 0;
1378
552709d5 1379 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1380 slave_dev->do_ioctl == NULL) {
1da177e4 1381 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1382 ": %s: Warning: no link monitoring support for %s\n",
1383 bond_dev->name, slave_dev->name);
1da177e4
LT		 1384 }
1385
1386 /* bond must be initialized by bond_open() before enslaving */
1387 if (!(bond_dev->flags & IFF_UP)) {
6b1bf096
MS		 1388 printk(KERN_WARNING DRV_NAME
1389 " %s: master_dev is not up in bond_enslave\n",
1390 bond_dev->name);
1da177e4
LT		 1391 }
1392
1393 /* already enslaved */
1394 if (slave_dev->flags & IFF_SLAVE) {
1395 dprintk("Error, Device was already enslaved\n");
1396 return -EBUSY;
1397 }
1398
1399 /* vlan challenged mutual exclusion */
1400 /* no need to lock since we're protected by rtnl_lock */
1401 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1402 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1403 if (!list_empty(&bond->vlan_list)) {
1404 printk(KERN_ERR DRV_NAME
4e0952c7 1405 ": %s: Error: cannot enslave VLAN "
1da177e4 1406 "challenged slave %s on VLAN enabled "
4e0952c7 1407 "bond %s\n", bond_dev->name, slave_dev->name,
1da177e4
LT		 1408 bond_dev->name);
1409 return -EPERM;
1410 } else {
1411 printk(KERN_WARNING DRV_NAME
4e0952c7 1412 ": %s: Warning: enslaved VLAN challenged "
1da177e4
LT		 1413 "slave %s. Adding VLANs will be blocked as "
1414 "long as %s is part of bond %s\n",
4e0952c7 1415 bond_dev->name, slave_dev->name, slave_dev->name,
1da177e4
LT		 1416 bond_dev->name);
1417 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1418 }
1419 } else {
1420 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1421 if (bond->slave_cnt == 0) {
1422 /* First slave, and it is not VLAN challenged,
1423 * so remove the block of adding VLANs over the bond.
1424 */
1425 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1426 }
1427 }
1428
217df670
JV		 1429 /*
1430 * Old ifenslave binaries are no longer supported. These can
1431 * be identified with moderate accurary by the state of the slave:
1432 * the current ifenslave will set the interface down prior to
1433 * enslaving it; the old ifenslave will not.
1434 */
1435 if ((slave_dev->flags & IFF_UP)) {
1436 printk(KERN_ERR DRV_NAME ": %s is up. "
1437 "This may be due to an out of date ifenslave.\n",
1438 slave_dev->name);
1439 res = -EPERM;
1440 goto err_undo_flags;
1441 }
1da177e4 1442
872254dd
MS		 1443 /* set bonding device ether type by slave - bonding netdevices are
1444 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1445 * there is a need to override some of the type dependent attribs/funcs.
1446 *
1447 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1448 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1449 */
1450 if (bond->slave_cnt == 0) {
1451 if (slave_dev->type != ARPHRD_ETHER)
1452 bond_setup_by_slave(bond_dev, slave_dev);
1453 } else if (bond_dev->type != slave_dev->type) {
1454 printk(KERN_ERR DRV_NAME ": %s ether type (%d) is different "
1455 "from other slaves (%d), can not enslave it.\n",
1456 slave_dev->name,
1457 slave_dev->type, bond_dev->type);
1458 res = -EINVAL;
1459 goto err_undo_flags;
1460 }
1461
217df670 1462 if (slave_dev->set_mac_address == NULL) {
2ab82852
MS		 1463 if (bond->slave_cnt == 0) {
1464 printk(KERN_WARNING DRV_NAME
dd957c57
JV		 1465 ": %s: Warning: The first slave device "
1466 "specified does not support setting the MAC "
3915c1e8 1467 "address. Setting fail_over_mac to active.",
dd957c57 1468 bond_dev->name);
3915c1e8
JV		 1469 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1470 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2ab82852 1471 printk(KERN_ERR DRV_NAME
dd957c57
JV		 1472 ": %s: Error: The slave device specified "
1473 "does not support setting the MAC address, "
3915c1e8 1474 "but fail_over_mac is not set to active.\n"
2ab82852
MS		 1475 , bond_dev->name);
1476 res = -EOPNOTSUPP;
1477 goto err_undo_flags;
1478 }
1da177e4
LT		 1479 }
1480
243cb4e5 1481 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1da177e4
LT		 1482 if (!new_slave) {
1483 res = -ENOMEM;
1484 goto err_undo_flags;
1485 }
1486
1da177e4
LT		 1487 /* save slave's original flags before calling
1488 * netdev_set_master and dev_open
1489 */
1490 new_slave->original_flags = slave_dev->flags;
1491
217df670
JV		 1492 /*
1493 * Save slave's original ("permanent") mac address for modes
1494 * that need it, and for restoring it upon release, and then
1495 * set it to the master's address
1496 */
1497 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1da177e4 1498
dd957c57 1499 if (!bond->params.fail_over_mac) {
2ab82852
MS		 1500 /*
1501 * Set slave to master's mac address. The application already
1502 * set the master's mac address to that of the first slave
1503 */
1504 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1505 addr.sa_family = slave_dev->type;
1506 res = dev_set_mac_address(slave_dev, &addr);
1507 if (res) {
1508 dprintk("Error %d calling set_mac_address\n", res);
1509 goto err_free;
1510 }
217df670 1511 }
1da177e4 1512
c2edacf8
JV		 1513 res = netdev_set_master(slave_dev, bond_dev);
1514 if (res) {
1515 dprintk("Error %d calling netdev_set_master\n", res);
569f0c4d 1516 goto err_restore_mac;
c2edacf8 1517 }
217df670
JV		 1518 /* open the slave since the application closed it */
1519 res = dev_open(slave_dev);
1520 if (res) {
1521 dprintk("Openning slave %s failed\n", slave_dev->name);
569f0c4d 1522 goto err_unset_master;
1da177e4
LT		 1523 }
1524
1da177e4 1525 new_slave->dev = slave_dev;
0b680e75 1526 slave_dev->priv_flags |= IFF_BONDING;
1da177e4
LT		 1527
1528 if ((bond->params.mode == BOND_MODE_TLB) ||
1529 (bond->params.mode == BOND_MODE_ALB)) {
1530 /* bond_alb_init_slave() must be called before all other stages since
1531 * it might fail and we do not want to have to undo everything
1532 */
1533 res = bond_alb_init_slave(bond, new_slave);
1534 if (res) {
569f0c4d 1535 goto err_close;
1da177e4
LT		 1536 }
1537 }
1538
1539 /* If the mode USES_PRIMARY, then the new slave gets the
1540 * master's promisc (and mc) settings only if it becomes the
1541 * curr_active_slave, and that is taken care of later when calling
1542 * bond_change_active()
1543 */
1544 if (!USES_PRIMARY(bond->params.mode)) {
1545 /* set promiscuity level to new slave */
1546 if (bond_dev->flags & IFF_PROMISC) {
1547 dev_set_promiscuity(slave_dev, 1);
1548 }
1549
1550 /* set allmulti level to new slave */
1551 if (bond_dev->flags & IFF_ALLMULTI) {
1552 dev_set_allmulti(slave_dev, 1);
1553 }
1554
80ee5ad2 1555 netif_tx_lock_bh(bond_dev);
1da177e4
LT		 1556 /* upload master's mc_list to new slave */
1557 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1558 dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1559 }
80ee5ad2 1560 netif_tx_unlock_bh(bond_dev);
1da177e4
LT		 1561 }
1562
1563 if (bond->params.mode == BOND_MODE_8023AD) {
1564 /* add lacpdu mc addr to mc list */
1565 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1566
1567 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1568 }
1569
1570 bond_add_vlans_on_slave(bond, slave_dev);
1571
1572 write_lock_bh(&bond->lock);
1573
1574 bond_attach_slave(bond, new_slave);
1575
1576 new_slave->delay = 0;
1577 new_slave->link_failure_count = 0;
1578
8531c5ff
AK		 1579 bond_compute_features(bond);
1580
3915c1e8
JV		 1581 write_unlock_bh(&bond->lock);
1582
1583 read_lock(&bond->lock);
1584
f5b2b966
JV		 1585 new_slave->last_arp_rx = jiffies;
1586
1da177e4
LT		 1587 if (bond->params.miimon && !bond->params.use_carrier) {
1588 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1589
1590 if ((link_reporting == -1) && !bond->params.arp_interval) {
1591 /*
1592 * miimon is set but a bonded network driver
1593 * does not support ETHTOOL/MII and
1594 * arp_interval is not set. Note: if
1595 * use_carrier is enabled, we will never go
1596 * here (because netif_carrier is always
1597 * supported); thus, we don't need to change
1598 * the messages for netif_carrier.
1599 */
1600 printk(KERN_WARNING DRV_NAME
4e0952c7 1601 ": %s: Warning: MII and ETHTOOL support not "
1da177e4
LT		 1602 "available for interface %s, and "
1603 "arp_interval/arp_ip_target module parameters "
1604 "not specified, thus bonding will not detect "
1605 "link failures! see bonding.txt for details.\n",
4e0952c7 1606 bond_dev->name, slave_dev->name);
1da177e4
LT		 1607 } else if (link_reporting == -1) {
1608 /* unable get link status using mii/ethtool */
1609 printk(KERN_WARNING DRV_NAME
4e0952c7 1610 ": %s: Warning: can't get link status from "
1da177e4
LT		 1611 "interface %s; the network driver associated "
1612 "with this interface does not support MII or "
1613 "ETHTOOL link status reporting, thus miimon "
1614 "has no effect on this interface.\n",
4e0952c7 1615 bond_dev->name, slave_dev->name);
1da177e4
LT		 1616 }
1617 }
1618
1619 /* check for initial state */
1620 if (!bond->params.miimon ||
1621 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1622 if (bond->params.updelay) {
1623 dprintk("Initial state of slave_dev is "
1624 "BOND_LINK_BACK\n");
1625 new_slave->link = BOND_LINK_BACK;
1626 new_slave->delay = bond->params.updelay;
1627 } else {
1628 dprintk("Initial state of slave_dev is "
1629 "BOND_LINK_UP\n");
1630 new_slave->link = BOND_LINK_UP;
1631 }
1632 new_slave->jiffies = jiffies;
1633 } else {
1634 dprintk("Initial state of slave_dev is "
1635 "BOND_LINK_DOWN\n");
1636 new_slave->link = BOND_LINK_DOWN;
1637 }
1638
1639 if (bond_update_speed_duplex(new_slave) &&
1640 (new_slave->link != BOND_LINK_DOWN)) {
1641 printk(KERN_WARNING DRV_NAME
4e0952c7 1642 ": %s: Warning: failed to get speed and duplex from %s, "
1da177e4 1643 "assumed to be 100Mb/sec and Full.\n",
4e0952c7 1644 bond_dev->name, new_slave->dev->name);
1da177e4
LT		 1645
1646 if (bond->params.mode == BOND_MODE_8023AD) {
4e0952c7
MW		 1647 printk(KERN_WARNING DRV_NAME
1648 ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1da177e4 1649 "support in base driver for proper aggregator "
4e0952c7 1650 "selection.\n", bond_dev->name);
1da177e4
LT		 1651 }
1652 }
1653
1654 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1655 /* if there is a primary slave, remember it */
1656 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1657 bond->primary_slave = new_slave;
1658 }
1659 }
1660
3915c1e8
JV		 1661 write_lock_bh(&bond->curr_slave_lock);
1662
1da177e4
LT		 1663 switch (bond->params.mode) {
1664 case BOND_MODE_ACTIVEBACKUP:
8a8e447b
JV		 1665 bond_set_slave_inactive_flags(new_slave);
1666 bond_select_active_slave(bond);
1da177e4
LT		 1667 break;
1668 case BOND_MODE_8023AD:
1669 /* in 802.3ad mode, the internal mechanism
1670 * will activate the slaves in the selected
1671 * aggregator
1672 */
1673 bond_set_slave_inactive_flags(new_slave);
1674 /* if this is the first slave */
1675 if (bond->slave_cnt == 1) {
1676 SLAVE_AD_INFO(new_slave).id = 1;
1677 /* Initialize AD with the number of times that the AD timer is called in 1 second
1678 * can be called only after the mac address of the bond is set
1679 */
1680 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1681 bond->params.lacp_fast);
1682 } else {
1683 SLAVE_AD_INFO(new_slave).id =
1684 SLAVE_AD_INFO(new_slave->prev).id + 1;
1685 }
1686
1687 bond_3ad_bind_slave(new_slave);
1688 break;
1689 case BOND_MODE_TLB:
1690 case BOND_MODE_ALB:
1691 new_slave->state = BOND_STATE_ACTIVE;
059fe7a5 1692 bond_set_slave_inactive_flags(new_slave);
1da177e4
LT		 1693 break;
1694 default:
1695 dprintk("This slave is always active in trunk mode\n");
1696
1697 /* always active in trunk mode */
1698 new_slave->state = BOND_STATE_ACTIVE;
1699
1700 /* In trunking mode there is little meaning to curr_active_slave
1701 * anyway (it holds no special properties of the bond device),
1702 * so we can change it without calling change_active_interface()
1703 */
1704 if (!bond->curr_active_slave) {
1705 bond->curr_active_slave = new_slave;
1706 }
1707 break;
1708 } /* switch(bond_mode) */
1709
3915c1e8
JV		 1710 write_unlock_bh(&bond->curr_slave_lock);
1711
ff59c456
JV		 1712 bond_set_carrier(bond);
1713
3915c1e8 1714 read_unlock(&bond->lock);
1da177e4 1715
b76cdba9
MW		 1716 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1717 if (res)
569f0c4d 1718 goto err_close;
b76cdba9 1719
1da177e4
LT		 1720 printk(KERN_INFO DRV_NAME
1721 ": %s: enslaving %s as a%s interface with a%s link.\n",
1722 bond_dev->name, slave_dev->name,
1723 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1724 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1725
1726 /* enslave is successful */
1727 return 0;
1728
1729/* Undo stages on error */
1da177e4
LT		 1730err_close:
1731 dev_close(slave_dev);
1732
569f0c4d
JV		 1733err_unset_master:
1734 netdev_set_master(slave_dev, NULL);
1735
1da177e4 1736err_restore_mac:
dd957c57 1737 if (!bond->params.fail_over_mac) {
3915c1e8
JV		 1738 /* XXX TODO - fom follow mode needs to change master's
1739 * MAC if this slave's MAC is in use by the bond, or at
1740 * least print a warning.
1741 */
2ab82852
MS		 1742 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1743 addr.sa_family = slave_dev->type;
1744 dev_set_mac_address(slave_dev, &addr);
1745 }
1da177e4
LT		 1746
1747err_free:
1748 kfree(new_slave);
1749
1750err_undo_flags:
1751 bond_dev->features = old_features;
8531c5ff 1752
1da177e4
LT		 1753 return res;
1754}
1755
1756/*
1757 * Try to release the slave device <slave> from the bond device <master>
1758 * It is legal to access curr_active_slave without a lock because all the function
1759 * is write-locked.
1760 *
1761 * The rules for slave state should be:
1762 * for Active/Backup:
1763 * Active stays on all backups go down
1764 * for Bonded connections:
1765 * The first up interface should be left on and all others downed.
1766 */
a77b5325 1767int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1da177e4
LT		 1768{
1769 struct bonding *bond = bond_dev->priv;
1770 struct slave *slave, *oldcurrent;
1771 struct sockaddr addr;
1772 int mac_addr_differ;
0795af57 1773 DECLARE_MAC_BUF(mac);
1da177e4
LT		 1774
1775 /* slave is not a slave or master is not master of this slave */
1776 if (!(slave_dev->flags & IFF_SLAVE) ||
1777 (slave_dev->master != bond_dev)) {
1778 printk(KERN_ERR DRV_NAME
4e0952c7 1779 ": %s: Error: cannot release %s.\n",
1da177e4
LT		 1780 bond_dev->name, slave_dev->name);
1781 return -EINVAL;
1782 }
1783
1784 write_lock_bh(&bond->lock);
1785
1786 slave = bond_get_slave_by_dev(bond, slave_dev);
1787 if (!slave) {
1788 /* not a slave of this bond */
1789 printk(KERN_INFO DRV_NAME
1790 ": %s: %s not enslaved\n",
1791 bond_dev->name, slave_dev->name);
f5e2a7b2 1792 write_unlock_bh(&bond->lock);
1da177e4
LT		 1793 return -EINVAL;
1794 }
1795
3915c1e8
JV		 1796 if (!bond->params.fail_over_mac) {
1797 mac_addr_differ = memcmp(bond_dev->dev_addr, slave->perm_hwaddr,
1798 ETH_ALEN);
1799 if (!mac_addr_differ && (bond->slave_cnt > 1))
1800 printk(KERN_WARNING DRV_NAME
1801 ": %s: Warning: the permanent HWaddr of %s - "
1802 "%s - is still in use by %s. "
1803 "Set the HWaddr of %s to a different address "
1804 "to avoid conflicts.\n",
1805 bond_dev->name, slave_dev->name,
1806 print_mac(mac, slave->perm_hwaddr),
1807 bond_dev->name, slave_dev->name);
1da177e4
LT		 1808 }
1809
1810 /* Inform AD package of unbinding of slave. */
1811 if (bond->params.mode == BOND_MODE_8023AD) {
1812 /* must be called before the slave is
1813 * detached from the list
1814 */
1815 bond_3ad_unbind_slave(slave);
1816 }
1817
1818 printk(KERN_INFO DRV_NAME
1819 ": %s: releasing %s interface %s\n",
1820 bond_dev->name,
1821 (slave->state == BOND_STATE_ACTIVE)
1822 ? "active" : "backup",
1823 slave_dev->name);
1824
1825 oldcurrent = bond->curr_active_slave;
1826
1827 bond->current_arp_slave = NULL;
1828
1829 /* release the slave from its bond */
1830 bond_detach_slave(bond, slave);
1831
8531c5ff
AK		 1832 bond_compute_features(bond);
1833
1da177e4
LT		 1834 if (bond->primary_slave == slave) {
1835 bond->primary_slave = NULL;
1836 }
1837
1838 if (oldcurrent == slave) {
1839 bond_change_active_slave(bond, NULL);
1840 }
1841
1842 if ((bond->params.mode == BOND_MODE_TLB) ||
1843 (bond->params.mode == BOND_MODE_ALB)) {
1844 /* Must be called only after the slave has been
1845 * detached from the list and the curr_active_slave
1846 * has been cleared (if our_slave == old_current),
1847 * but before a new active slave is selected.
1848 */
2543331d 1849 write_unlock_bh(&bond->lock);
1da177e4 1850 bond_alb_deinit_slave(bond, slave);
2543331d 1851 write_lock_bh(&bond->lock);
1da177e4
LT		 1852 }
1853
059fe7a5
JV		 1854 if (oldcurrent == slave) {
1855 /*
1856 * Note that we hold RTNL over this sequence, so there
1857 * is no concern that another slave add/remove event
1858 * will interfere.
1859 */
1860 write_unlock_bh(&bond->lock);
1861 read_lock(&bond->lock);
1862 write_lock_bh(&bond->curr_slave_lock);
1863
1da177e4
LT		 1864 bond_select_active_slave(bond);
1865
059fe7a5
JV		 1866 write_unlock_bh(&bond->curr_slave_lock);
1867 read_unlock(&bond->lock);
1868 write_lock_bh(&bond->lock);
1869 }
1870
1da177e4 1871 if (bond->slave_cnt == 0) {
ff59c456
JV		 1872 bond_set_carrier(bond);
1873
1da177e4
LT		 1874 /* if the last slave was removed, zero the mac address
1875 * of the master so it will be set by the application
1876 * to the mac address of the first slave
1877 */
1878 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1879
1880 if (list_empty(&bond->vlan_list)) {
1881 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1882 } else {
1883 printk(KERN_WARNING DRV_NAME
4e0952c7 1884 ": %s: Warning: clearing HW address of %s while it "
1da177e4 1885 "still has VLANs.\n",
4e0952c7 1886 bond_dev->name, bond_dev->name);
1da177e4 1887 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 1888 ": %s: When re-adding slaves, make sure the bond's "
1889 "HW address matches its VLANs'.\n",
1890 bond_dev->name);
1da177e4
LT		 1891 }
1892 } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1893 !bond_has_challenged_slaves(bond)) {
1894 printk(KERN_INFO DRV_NAME
4e0952c7 1895 ": %s: last VLAN challenged slave %s "
1da177e4 1896 "left bond %s. VLAN blocking is removed\n",
4e0952c7 1897 bond_dev->name, slave_dev->name, bond_dev->name);
1da177e4
LT		 1898 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1899 }
1900
1901 write_unlock_bh(&bond->lock);
1902
b76cdba9
MW		 1903 /* must do this from outside any spinlocks */
1904 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1905
1da177e4
LT		 1906 bond_del_vlans_from_slave(bond, slave_dev);
1907
1908 /* If the mode USES_PRIMARY, then we should only remove its
1909 * promisc and mc settings if it was the curr_active_slave, but that was
1910 * already taken care of above when we detached the slave
1911 */
1912 if (!USES_PRIMARY(bond->params.mode)) {
1913 /* unset promiscuity level from slave */
1914 if (bond_dev->flags & IFF_PROMISC) {
1915 dev_set_promiscuity(slave_dev, -1);
1916 }
1917
1918 /* unset allmulti level from slave */
1919 if (bond_dev->flags & IFF_ALLMULTI) {
1920 dev_set_allmulti(slave_dev, -1);
1921 }
1922
1923 /* flush master's mc_list from slave */
80ee5ad2 1924 netif_tx_lock_bh(bond_dev);
1da177e4 1925 bond_mc_list_flush(bond_dev, slave_dev);
80ee5ad2 1926 netif_tx_unlock_bh(bond_dev);
1da177e4
LT		 1927 }
1928
1929 netdev_set_master(slave_dev, NULL);
1930
1931 /* close slave before restoring its mac address */
1932 dev_close(slave_dev);
1933
3915c1e8 1934 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2ab82852
MS		 1935 /* restore original ("permanent") mac address */
1936 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1937 addr.sa_family = slave_dev->type;
1938 dev_set_mac_address(slave_dev, &addr);
1939 }
1da177e4 1940
8f903c70 1941 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
f5b2b966
JV		 1942 IFF_SLAVE_INACTIVE | IFF_BONDING |
1943 IFF_SLAVE_NEEDARP);
1da177e4
LT		 1944
1945 kfree(slave);
1946
1947 return 0; /* deletion OK */
1948}
1949
d90a162a
MS		 1950/*
1951* Destroy a bonding device.
1952* Must be under rtnl_lock when this function is called.
1953*/
1954void bond_destroy(struct bonding *bond)
1955{
1956 bond_deinit(bond->dev);
1957 bond_destroy_sysfs_entry(bond);
8cbdeec6 1958 unregister_netdevice(bond->dev);
d90a162a
MS		 1959}
1960
1961/*
1962* First release a slave and than destroy the bond if no more slaves iare left.
1963* Must be under rtnl_lock when this function is called.
1964*/
1965int bond_release_and_destroy(struct net_device *bond_dev, struct net_device *slave_dev)
1966{
1967 struct bonding *bond = bond_dev->priv;
1968 int ret;
1969
1970 ret = bond_release(bond_dev, slave_dev);
1971 if ((ret == 0) && (bond->slave_cnt == 0)) {
1972 printk(KERN_INFO DRV_NAME ": %s: destroying bond %s.\n",
1973 bond_dev->name, bond_dev->name);
1974 bond_destroy(bond);
1975 }
1976 return ret;
1977}
1978
1da177e4
LT		 1979/*
1980 * This function releases all slaves.
1981 */
1982static int bond_release_all(struct net_device *bond_dev)
1983{
1984 struct bonding *bond = bond_dev->priv;
1985 struct slave *slave;
1986 struct net_device *slave_dev;
1987 struct sockaddr addr;
1988
1989 write_lock_bh(&bond->lock);
1990
ff59c456
JV		 1991 netif_carrier_off(bond_dev);
1992
1da177e4
LT		 1993 if (bond->slave_cnt == 0) {
1994 goto out;
1995 }
1996
1997 bond->current_arp_slave = NULL;
1998 bond->primary_slave = NULL;
1999 bond_change_active_slave(bond, NULL);
2000
2001 while ((slave = bond->first_slave) != NULL) {
2002 /* Inform AD package of unbinding of slave
2003 * before slave is detached from the list.
2004 */
2005 if (bond->params.mode == BOND_MODE_8023AD) {
2006 bond_3ad_unbind_slave(slave);
2007 }
2008
2009 slave_dev = slave->dev;
2010 bond_detach_slave(bond, slave);
2011
2543331d
JV		 2012 /* now that the slave is detached, unlock and perform
2013 * all the undo steps that should not be called from
2014 * within a lock.
2015 */
2016 write_unlock_bh(&bond->lock);
2017
1da177e4
LT		 2018 if ((bond->params.mode == BOND_MODE_TLB) ||
2019 (bond->params.mode == BOND_MODE_ALB)) {
2020 /* must be called only after the slave
2021 * has been detached from the list
2022 */
2023 bond_alb_deinit_slave(bond, slave);
2024 }
2025
8531c5ff
AK		 2026 bond_compute_features(bond);
2027
b76cdba9 2028 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1da177e4
LT		 2029 bond_del_vlans_from_slave(bond, slave_dev);
2030
2031 /* If the mode USES_PRIMARY, then we should only remove its
2032 * promisc and mc settings if it was the curr_active_slave, but that was
2033 * already taken care of above when we detached the slave
2034 */
2035 if (!USES_PRIMARY(bond->params.mode)) {
2036 /* unset promiscuity level from slave */
2037 if (bond_dev->flags & IFF_PROMISC) {
2038 dev_set_promiscuity(slave_dev, -1);
2039 }
2040
2041 /* unset allmulti level from slave */
2042 if (bond_dev->flags & IFF_ALLMULTI) {
2043 dev_set_allmulti(slave_dev, -1);
2044 }
2045
2046 /* flush master's mc_list from slave */
80ee5ad2 2047 netif_tx_lock_bh(bond_dev);
1da177e4 2048 bond_mc_list_flush(bond_dev, slave_dev);
80ee5ad2 2049 netif_tx_unlock_bh(bond_dev);
1da177e4
LT		 2050 }
2051
2052 netdev_set_master(slave_dev, NULL);
2053
2054 /* close slave before restoring its mac address */
2055 dev_close(slave_dev);
2056
dd957c57 2057 if (!bond->params.fail_over_mac) {
2ab82852
MS		 2058 /* restore original ("permanent") mac address*/
2059 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2060 addr.sa_family = slave_dev->type;
2061 dev_set_mac_address(slave_dev, &addr);
2062 }
1da177e4 2063
8f903c70
JV		 2064 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2065 IFF_SLAVE_INACTIVE);
1da177e4
LT		 2066
2067 kfree(slave);
2068
2069 /* re-acquire the lock before getting the next slave */
2070 write_lock_bh(&bond->lock);
2071 }
2072
2073 /* zero the mac address of the master so it will be
2074 * set by the application to the mac address of the
2075 * first slave
2076 */
2077 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2078
2079 if (list_empty(&bond->vlan_list)) {
2080 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2081 } else {
2082 printk(KERN_WARNING DRV_NAME
4e0952c7 2083 ": %s: Warning: clearing HW address of %s while it "
1da177e4 2084 "still has VLANs.\n",
4e0952c7 2085 bond_dev->name, bond_dev->name);
1da177e4 2086 printk(KERN_WARNING DRV_NAME
4e0952c7
MW		 2087 ": %s: When re-adding slaves, make sure the bond's "
2088 "HW address matches its VLANs'.\n",
2089 bond_dev->name);
1da177e4
LT		 2090 }
2091
2092 printk(KERN_INFO DRV_NAME
2093 ": %s: released all slaves\n",
2094 bond_dev->name);
2095
2096out:
2097 write_unlock_bh(&bond->lock);
2098
2099 return 0;
2100}
2101
2102/*
2103 * This function changes the active slave to slave <slave_dev>.
2104 * It returns -EINVAL in the following cases.
2105 * - <slave_dev> is not found in the list.
2106 * - There is not active slave now.
2107 * - <slave_dev> is already active.
2108 * - The link state of <slave_dev> is not BOND_LINK_UP.
2109 * - <slave_dev> is not running.
2110 * In these cases, this fuction does nothing.
2111 * In the other cases, currnt_slave pointer is changed and 0 is returned.
2112 */
2113static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2114{
2115 struct bonding *bond = bond_dev->priv;
2116 struct slave *old_active = NULL;
2117 struct slave *new_active = NULL;
2118 int res = 0;
2119
2120 if (!USES_PRIMARY(bond->params.mode)) {
2121 return -EINVAL;
2122 }
2123
2124 /* Verify that master_dev is indeed the master of slave_dev */
2125 if (!(slave_dev->flags & IFF_SLAVE) ||
2126 (slave_dev->master != bond_dev)) {
2127 return -EINVAL;
2128 }
2129
059fe7a5 2130 read_lock(&bond->lock);
1da177e4 2131
059fe7a5 2132 read_lock(&bond->curr_slave_lock);
1da177e4 2133 old_active = bond->curr_active_slave;
059fe7a5
JV		 2134 read_unlock(&bond->curr_slave_lock);
2135
1da177e4
LT		 2136 new_active = bond_get_slave_by_dev(bond, slave_dev);
2137
2138 /*
2139 * Changing to the current active: do nothing; return success.
2140 */
2141 if (new_active && (new_active == old_active)) {
059fe7a5 2142 read_unlock(&bond->lock);
1da177e4
LT		 2143 return 0;
2144 }
2145
2146 if ((new_active) &&
2147 (old_active) &&
2148 (new_active->link == BOND_LINK_UP) &&
2149 IS_UP(new_active->dev)) {
059fe7a5 2150 write_lock_bh(&bond->curr_slave_lock);
1da177e4 2151 bond_change_active_slave(bond, new_active);
059fe7a5 2152 write_unlock_bh(&bond->curr_slave_lock);
1da177e4
LT		 2153 } else {
2154 res = -EINVAL;
2155 }
2156
059fe7a5 2157 read_unlock(&bond->lock);
1da177e4
LT		 2158
2159 return res;
2160}
2161
1da177e4
LT		 2162static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2163{
2164 struct bonding *bond = bond_dev->priv;
2165
2166 info->bond_mode = bond->params.mode;
2167 info->miimon = bond->params.miimon;
2168
6603a6f2 2169 read_lock(&bond->lock);
1da177e4 2170 info->num_slaves = bond->slave_cnt;
6603a6f2 2171 read_unlock(&bond->lock);
1da177e4
LT		 2172
2173 return 0;
2174}
2175
2176static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2177{
2178 struct bonding *bond = bond_dev->priv;
2179 struct slave *slave;
2180 int i, found = 0;
2181
2182 if (info->slave_id < 0) {
2183 return -ENODEV;
2184 }
2185
6603a6f2 2186 read_lock(&bond->lock);
1da177e4
LT		 2187
2188 bond_for_each_slave(bond, slave, i) {
2189 if (i == (int)info->slave_id) {
2190 found = 1;
2191 break;
2192 }
2193 }
2194
6603a6f2 2195 read_unlock(&bond->lock);
1da177e4
LT		 2196
2197 if (found) {
2198 strcpy(info->slave_name, slave->dev->name);
2199 info->link = slave->link;
2200 info->state = slave->state;
2201 info->link_failure_count = slave->link_failure_count;
2202 } else {
2203 return -ENODEV;
2204 }
2205
2206 return 0;
2207}
2208
2209/*-------------------------------- Monitoring -------------------------------*/
2210
0b0eef66
JV		 2211/*
2212 * if !have_locks, return nonzero if a failover is necessary. if
2213 * have_locks, do whatever failover activities are needed.
2214 *
2215 * This is to separate the inspection and failover steps for locking
2216 * purposes; failover requires rtnl, but acquiring it for every
2217 * inspection is undesirable, so a wrapper first does inspection, and
2218 * the acquires the necessary locks and calls again to perform
2219 * failover if needed. Since all locks are dropped, a complete
2220 * restart is needed between calls.
2221 */
2222static int __bond_mii_monitor(struct bonding *bond, int have_locks)
1da177e4 2223{
1da177e4
LT		 2224 struct slave *slave, *oldcurrent;
2225 int do_failover = 0;
1da177e4
LT		 2226 int i;
2227
0b0eef66 2228 if (bond->slave_cnt == 0)
1da177e4 2229 goto out;
1da177e4
LT		 2230
2231 /* we will try to read the link status of each of our slaves, and
2232 * set their IFF_RUNNING flag appropriately. For each slave not
2233 * supporting MII status, we won't do anything so that a user-space
2234 * program could monitor the link itself if needed.
2235 */
2236
2237 read_lock(&bond->curr_slave_lock);
2238 oldcurrent = bond->curr_active_slave;
2239 read_unlock(&bond->curr_slave_lock);
2240
2241 bond_for_each_slave(bond, slave, i) {
2242 struct net_device *slave_dev = slave->dev;
2243 int link_state;
2244 u16 old_speed = slave->speed;
2245 u8 old_duplex = slave->duplex;
2246
2247 link_state = bond_check_dev_link(bond, slave_dev, 0);
2248
2249 switch (slave->link) {
2250 case BOND_LINK_UP: /* the link was up */
2251 if (link_state == BMSR_LSTATUS) {
059fe7a5
JV		 2252 if (!oldcurrent) {
2253 if (!have_locks)
2254 return 1;
2255 do_failover = 1;
2256 }
1da177e4
LT		 2257 break;
2258 } else { /* link going down */
2259 slave->link = BOND_LINK_FAIL;
2260 slave->delay = bond->params.downdelay;
2261
2262 if (slave->link_failure_count < UINT_MAX) {
2263 slave->link_failure_count++;
2264 }
2265
2266 if (bond->params.downdelay) {
2267 printk(KERN_INFO DRV_NAME
2268 ": %s: link status down for %s "
2269 "interface %s, disabling it in "
2270 "%d ms.\n",
1b76b316 2271 bond->dev->name,
1da177e4
LT		 2272 IS_UP(slave_dev)
2273 ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2274 ? ((slave == oldcurrent)
2275 ? "active " : "backup ")
2276 : "")
2277 : "idle ",
2278 slave_dev->name,
2279 bond->params.downdelay * bond->params.miimon);
2280 }
2281 }
2282 /* no break ! fall through the BOND_LINK_FAIL test to
2283 ensure proper action to be taken
2284 */
2285 case BOND_LINK_FAIL: /* the link has just gone down */
2286 if (link_state != BMSR_LSTATUS) {
2287 /* link stays down */
2288 if (slave->delay <= 0) {
0b0eef66
JV		 2289 if (!have_locks)
2290 return 1;
2291
1da177e4
LT		 2292 /* link down for too long time */
2293 slave->link = BOND_LINK_DOWN;
2294
2295 /* in active/backup mode, we must
2296 * completely disable this interface
2297 */
2298 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2299 (bond->params.mode == BOND_MODE_8023AD)) {
2300 bond_set_slave_inactive_flags(slave);
2301 }
2302
2303 printk(KERN_INFO DRV_NAME
2304 ": %s: link status definitely "
2305 "down for interface %s, "
2306 "disabling it\n",
1b76b316 2307 bond->dev->name,
1da177e4
LT		 2308 slave_dev->name);
2309
2310 /* notify ad that the link status has changed */
2311 if (bond->params.mode == BOND_MODE_8023AD) {
2312 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2313 }
2314
2315 if ((bond->params.mode == BOND_MODE_TLB) ||
2316 (bond->params.mode == BOND_MODE_ALB)) {
2317 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2318 }
2319
2320 if (slave == oldcurrent) {
2321 do_failover = 1;
2322 }
2323 } else {
2324 slave->delay--;
2325 }
2326 } else {
2327 /* link up again */
2328 slave->link = BOND_LINK_UP;
2329 slave->jiffies = jiffies;
2330 printk(KERN_INFO DRV_NAME
2331 ": %s: link status up again after %d "
2332 "ms for interface %s.\n",
1b76b316 2333 bond->dev->name,
1da177e4
LT		 2334 (bond->params.downdelay - slave->delay) * bond->params.miimon,
2335 slave_dev->name);
2336 }
2337 break;
2338 case BOND_LINK_DOWN: /* the link was down */
2339 if (link_state != BMSR_LSTATUS) {
2340 /* the link stays down, nothing more to do */
2341 break;
2342 } else { /* link going up */
2343 slave->link = BOND_LINK_BACK;
2344 slave->delay = bond->params.updelay;
2345
2346 if (bond->params.updelay) {
2347 /* if updelay == 0, no need to
2348 advertise about a 0 ms delay */
2349 printk(KERN_INFO DRV_NAME
2350 ": %s: link status up for "
2351 "interface %s, enabling it "
2352 "in %d ms.\n",
1b76b316 2353 bond->dev->name,
1da177e4
LT		 2354 slave_dev->name,
2355 bond->params.updelay * bond->params.miimon);
2356 }
2357 }
2358 /* no break ! fall through the BOND_LINK_BACK state in
2359 case there's something to do.
2360 */
2361 case BOND_LINK_BACK: /* the link has just come back */
2362 if (link_state != BMSR_LSTATUS) {
2363 /* link down again */
2364 slave->link = BOND_LINK_DOWN;
2365
2366 printk(KERN_INFO DRV_NAME
2367 ": %s: link status down again after %d "
2368 "ms for interface %s.\n",
1b76b316 2369 bond->dev->name,
1da177e4
LT		 2370 (bond->params.updelay - slave->delay) * bond->params.miimon,
2371 slave_dev->name);
2372 } else {
2373 /* link stays up */
2374 if (slave->delay == 0) {
0b0eef66
JV		 2375 if (!have_locks)
2376 return 1;
2377
1da177e4
LT		 2378 /* now the link has been up for long time enough */
2379 slave->link = BOND_LINK_UP;
2380 slave->jiffies = jiffies;
2381
2382 if (bond->params.mode == BOND_MODE_8023AD) {
2383 /* prevent it from being the active one */
2384 slave->state = BOND_STATE_BACKUP;
2385 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2386 /* make it immediately active */
2387 slave->state = BOND_STATE_ACTIVE;
2388 } else if (slave != bond->primary_slave) {
2389 /* prevent it from being the active one */
2390 slave->state = BOND_STATE_BACKUP;
2391 }
2392
2393 printk(KERN_INFO DRV_NAME
2394 ": %s: link status definitely "
2395 "up for interface %s.\n",
1b76b316 2396 bond->dev->name,
1da177e4
LT		 2397 slave_dev->name);
2398
2399 /* notify ad that the link status has changed */
2400 if (bond->params.mode == BOND_MODE_8023AD) {
2401 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2402 }
2403
2404 if ((bond->params.mode == BOND_MODE_TLB) ||
2405 (bond->params.mode == BOND_MODE_ALB)) {
2406 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2407 }
2408
2409 if ((!oldcurrent) ||
2410 (slave == bond->primary_slave)) {
2411 do_failover = 1;
2412 }
2413 } else {
2414 slave->delay--;
2415 }
2416 }
2417 break;
2418 default:
2419 /* Should not happen */
4e0952c7
MW		 2420 printk(KERN_ERR DRV_NAME
2421 ": %s: Error: %s Illegal value (link=%d)\n",
1b76b316 2422 bond->dev->name,
4e0952c7
MW		 2423 slave->dev->name,
2424 slave->link);
1da177e4
LT		 2425 goto out;
2426 } /* end of switch (slave->link) */
2427
2428 bond_update_speed_duplex(slave);
2429
2430 if (bond->params.mode == BOND_MODE_8023AD) {
2431 if (old_speed != slave->speed) {
2432 bond_3ad_adapter_speed_changed(slave);
2433 }
2434
2435 if (old_duplex != slave->duplex) {
2436 bond_3ad_adapter_duplex_changed(slave);
2437 }
2438 }
2439
2440 } /* end of for */
2441
2442 if (do_failover) {
059fe7a5
JV		 2443 ASSERT_RTNL();
2444
2445 write_lock_bh(&bond->curr_slave_lock);
1da177e4
LT		 2446
2447 bond_select_active_slave(bond);
2448
059fe7a5
JV		 2449 write_unlock_bh(&bond->curr_slave_lock);
2450
ff59c456
JV		 2451 } else
2452 bond_set_carrier(bond);
1da177e4 2453
1da177e4 2454out:
0b0eef66 2455 return 0;
1da177e4
LT		 2456}
2457
0b0eef66
JV		 2458/*
2459 * bond_mii_monitor
2460 *
2461 * Really a wrapper that splits the mii monitor into two phases: an
2462 * inspection, then (if inspection indicates something needs to be
2463 * done) an acquisition of appropriate locks followed by another pass
2464 * to implement whatever link state changes are indicated.
2465 */
2466void bond_mii_monitor(struct work_struct *work)
2467{
2468 struct bonding *bond = container_of(work, struct bonding,
2469 mii_work.work);
2470 unsigned long delay;
2471
2472 read_lock(&bond->lock);
2473 if (bond->kill_timers) {
2474 read_unlock(&bond->lock);
2475 return;
2476 }
b59f9f74
JV		 2477
2478 if (bond->send_grat_arp) {
2479 read_lock(&bond->curr_slave_lock);
2480 bond_send_gratuitous_arp(bond);
2481 read_unlock(&bond->curr_slave_lock);
2482 }
2483
0b0eef66
JV		 2484 if (__bond_mii_monitor(bond, 0)) {
2485 read_unlock(&bond->lock);
2486 rtnl_lock();
2487 read_lock(&bond->lock);
2488 __bond_mii_monitor(bond, 1);
5655662d
JV		 2489 read_unlock(&bond->lock);
2490 rtnl_unlock(); /* might sleep, hold no other locks */
2491 read_lock(&bond->lock);
0b0eef66
JV		 2492 }
2493
5ce0da8f 2494 delay = msecs_to_jiffies(bond->params.miimon);
0b0eef66
JV		 2495 read_unlock(&bond->lock);
2496 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2497}
c3ade5ca 2498
d3bb52b0 2499static __be32 bond_glean_dev_ip(struct net_device *dev)
c3ade5ca
JV		 2500{
2501 struct in_device *idev;
2502 struct in_ifaddr *ifa;
a144ea4b 2503 __be32 addr = 0;
c3ade5ca
JV		 2504
2505 if (!dev)
2506 return 0;
2507
2508 rcu_read_lock();
e5ed6399 2509 idev = __in_dev_get_rcu(dev);
c3ade5ca
JV		 2510 if (!idev)
2511 goto out;
2512
2513 ifa = idev->ifa_list;
2514 if (!ifa)
2515 goto out;
2516
2517 addr = ifa->ifa_local;
2518out:
2519 rcu_read_unlock();
2520 return addr;
2521}
2522
d3bb52b0 2523static int bond_has_this_ip(struct bonding *bond, __be32 ip)
f5b2b966 2524{
0883beca 2525 struct vlan_entry *vlan;
f5b2b966
JV		 2526
2527 if (ip == bond->master_ip)
2528 return 1;
2529
0883beca 2530 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
f5b2b966
JV		 2531 if (ip == vlan->vlan_ip)
2532 return 1;
2533 }
2534
2535 return 0;
2536}
2537
c3ade5ca
JV		 2538/*
2539 * We go to the (large) trouble of VLAN tagging ARP frames because
2540 * switches in VLAN mode (especially if ports are configured as
2541 * "native" to a VLAN) might not pass non-tagged frames.
2542 */
d3bb52b0 2543static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
c3ade5ca
JV		 2544{
2545 struct sk_buff *skb;
2546
2547 dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2548 slave_dev->name, dest_ip, src_ip, vlan_id);
2549
2550 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2551 NULL, slave_dev->dev_addr, NULL);
2552
2553 if (!skb) {
2554 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2555 return;
2556 }
2557 if (vlan_id) {
2558 skb = vlan_put_tag(skb, vlan_id);
2559 if (!skb) {
2560 printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2561 return;
2562 }
2563 }
2564 arp_xmit(skb);
2565}
2566
2567
1da177e4
LT		 2568static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2569{
c3ade5ca 2570 int i, vlan_id, rv;
d3bb52b0 2571 __be32 *targets = bond->params.arp_targets;
0883beca 2572 struct vlan_entry *vlan;
c3ade5ca
JV		 2573 struct net_device *vlan_dev;
2574 struct flowi fl;
2575 struct rtable *rt;
1da177e4 2576
6b780567
MW		 2577 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2578 if (!targets[i])
2579 continue;
c3ade5ca
JV		 2580 dprintk("basa: target %x\n", targets[i]);
2581 if (list_empty(&bond->vlan_list)) {
2582 dprintk("basa: empty vlan: arp_send\n");
2583 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2584 bond->master_ip, 0);
2585 continue;
2586 }
2587
2588 /*
2589 * If VLANs are configured, we do a route lookup to
2590 * determine which VLAN interface would be used, so we
2591 * can tag the ARP with the proper VLAN tag.
2592 */
2593 memset(&fl, 0, sizeof(fl));
2594 fl.fl4_dst = targets[i];
2595 fl.fl4_tos = RTO_ONLINK;
2596
f206351a 2597 rv = ip_route_output_key(&init_net, &rt, &fl);
c3ade5ca
JV		 2598 if (rv) {
2599 if (net_ratelimit()) {
2600 printk(KERN_WARNING DRV_NAME
2601 ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2602 bond->dev->name, NIPQUAD(fl.fl4_dst));
2603 }
2604 continue;
2605 }
2606
2607 /*
2608 * This target is not on a VLAN
2609 */
2610 if (rt->u.dst.dev == bond->dev) {
ed4b9f80 2611 ip_rt_put(rt);
c3ade5ca
JV		 2612 dprintk("basa: rtdev == bond->dev: arp_send\n");
2613 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2614 bond->master_ip, 0);
2615 continue;
2616 }
2617
2618 vlan_id = 0;
0883beca 2619 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
5c15bdec 2620 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
c3ade5ca
JV		 2621 if (vlan_dev == rt->u.dst.dev) {
2622 vlan_id = vlan->vlan_id;
2623 dprintk("basa: vlan match on %s %d\n",
2624 vlan_dev->name, vlan_id);
2625 break;
2626 }
2627 }
2628
2629 if (vlan_id) {
ed4b9f80 2630 ip_rt_put(rt);
c3ade5ca
JV		 2631 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2632 vlan->vlan_ip, vlan_id);
2633 continue;
2634 }
2635
2636 if (net_ratelimit()) {
2637 printk(KERN_WARNING DRV_NAME
2638 ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2639 bond->dev->name, NIPQUAD(fl.fl4_dst),
2640 rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2641 }
ed4b9f80 2642 ip_rt_put(rt);
c3ade5ca
JV		 2643 }
2644}
2645
2646/*
2647 * Kick out a gratuitous ARP for an IP on the bonding master plus one
2648 * for each VLAN above us.
b59f9f74
JV		 2649 *
2650 * Caller must hold curr_slave_lock for read or better
c3ade5ca
JV		 2651 */
2652static void bond_send_gratuitous_arp(struct bonding *bond)
2653{
2654 struct slave *slave = bond->curr_active_slave;
2655 struct vlan_entry *vlan;
2656 struct net_device *vlan_dev;
2657
2658 dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2659 slave ? slave->dev->name : "NULL");
b59f9f74
JV		 2660
2661 if (!slave || !bond->send_grat_arp ||
2662 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
c3ade5ca
JV		 2663 return;
2664
b59f9f74
JV		 2665 bond->send_grat_arp--;
2666
c3ade5ca
JV		 2667 if (bond->master_ip) {
2668 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
1053f62c 2669 bond->master_ip, 0);
c3ade5ca
JV		 2670 }
2671
2672 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
5c15bdec 2673 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
c3ade5ca
JV		 2674 if (vlan->vlan_ip) {
2675 bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2676 vlan->vlan_ip, vlan->vlan_id);
2677 }
1da177e4
LT		 2678 }
2679}
2680
d3bb52b0 2681static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
f5b2b966
JV		 2682{
2683 int i;
d3bb52b0 2684 __be32 *targets = bond->params.arp_targets;
f5b2b966
JV		 2685
2686 targets = bond->params.arp_targets;
2687 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2688 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2689 "%u.%u.%u.%u bhti(tip) %d\n",
2690 NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2691 bond_has_this_ip(bond, tip));
2692 if (sip == targets[i]) {
2693 if (bond_has_this_ip(bond, tip))
2694 slave->last_arp_rx = jiffies;
2695 return;
2696 }
2697 }
2698}
2699
2700static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2701{
2702 struct arphdr *arp;
2703 struct slave *slave;
2704 struct bonding *bond;
2705 unsigned char *arp_ptr;
d3bb52b0 2706 __be32 sip, tip;
f5b2b966 2707
c346dca1 2708 if (dev_net(dev) != &init_net)
e730c155
EB		 2709 goto out;
2710
f5b2b966
JV		 2711 if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2712 goto out;
2713
2714 bond = dev->priv;
2715 read_lock(&bond->lock);
2716
2717 dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2718 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2719 orig_dev ? orig_dev->name : "NULL");
2720
2721 slave = bond_get_slave_by_dev(bond, orig_dev);
2722 if (!slave || !slave_do_arp_validate(bond, slave))
2723 goto out_unlock;
2724
988b7050 2725 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
f5b2b966
JV		 2726 goto out_unlock;
2727
d0a92be0 2728 arp = arp_hdr(skb);
f5b2b966
JV		 2729 if (arp->ar_hln != dev->addr_len ||
2730 skb->pkt_type == PACKET_OTHERHOST ||
2731 skb->pkt_type == PACKET_LOOPBACK ||
2732 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2733 arp->ar_pro != htons(ETH_P_IP) ||
2734 arp->ar_pln != 4)
2735 goto out_unlock;
2736
2737 arp_ptr = (unsigned char *)(arp + 1);
2738 arp_ptr += dev->addr_len;
2739 memcpy(&sip, arp_ptr, 4);
2740 arp_ptr += 4 + dev->addr_len;
2741 memcpy(&tip, arp_ptr, 4);
2742
2743 dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2744 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2745 slave->state, bond->params.arp_validate,
2746 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2747
2748 /*
2749 * Backup slaves won't see the ARP reply, but do come through
2750 * here for each ARP probe (so we swap the sip/tip to validate
2751 * the probe). In a "redundant switch, common router" type of
2752 * configuration, the ARP probe will (hopefully) travel from
2753 * the active, through one switch, the router, then the other
2754 * switch before reaching the backup.
2755 */
2756 if (slave->state == BOND_STATE_ACTIVE)
2757 bond_validate_arp(bond, slave, sip, tip);
2758 else
2759 bond_validate_arp(bond, slave, tip, sip);
2760
2761out_unlock:
2762 read_unlock(&bond->lock);
2763out:
2764 dev_kfree_skb(skb);
2765 return NET_RX_SUCCESS;
2766}
2767
1da177e4
LT		 2768/*
2769 * this function is called regularly to monitor each slave's link
2770 * ensuring that traffic is being sent and received when arp monitoring
2771 * is used in load-balancing mode. if the adapter has been dormant, then an
2772 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2773 * arp monitoring in active backup mode.
2774 */
1b76b316 2775void bond_loadbalance_arp_mon(struct work_struct *work)
1da177e4 2776{
1b76b316
JV		 2777 struct bonding *bond = container_of(work, struct bonding,
2778 arp_work.work);
1da177e4
LT		 2779 struct slave *slave, *oldcurrent;
2780 int do_failover = 0;
2781 int delta_in_ticks;
2782 int i;
2783
2784 read_lock(&bond->lock);
2785
5ce0da8f 2786 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
1da177e4
LT		 2787
2788 if (bond->kill_timers) {
2789 goto out;
2790 }
2791
2792 if (bond->slave_cnt == 0) {
2793 goto re_arm;
2794 }
2795
2796 read_lock(&bond->curr_slave_lock);
2797 oldcurrent = bond->curr_active_slave;
2798 read_unlock(&bond->curr_slave_lock);
2799
2800 /* see if any of the previous devices are up now (i.e. they have
2801 * xmt and rcv traffic). the curr_active_slave does not come into
2802 * the picture unless it is null. also, slave->jiffies is not needed
2803 * here because we send an arp on each slave and give a slave as
2804 * long as it needs to get the tx/rx within the delta.
2805 * TODO: what about up/down delay in arp mode? it wasn't here before
2806 * so it can wait
2807 */
2808 bond_for_each_slave(bond, slave, i) {
2809 if (slave->link != BOND_LINK_UP) {
b63bb739
DS		 2810 if (time_before_eq(jiffies, slave->dev->trans_start + delta_in_ticks) &&
2811 time_before_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
1da177e4
LT		 2812
2813 slave->link = BOND_LINK_UP;
2814 slave->state = BOND_STATE_ACTIVE;
2815
2816 /* primary_slave has no meaning in round-robin
2817 * mode. the window of a slave being up and
2818 * curr_active_slave being null after enslaving
2819 * is closed.
2820 */
2821 if (!oldcurrent) {
2822 printk(KERN_INFO DRV_NAME
2823 ": %s: link status definitely "
2824 "up for interface %s, ",
1b76b316 2825 bond->dev->name,
1da177e4
LT		 2826 slave->dev->name);
2827 do_failover = 1;
2828 } else {
2829 printk(KERN_INFO DRV_NAME
2830 ": %s: interface %s is now up\n",
1b76b316 2831 bond->dev->name,
1da177e4
LT		 2832 slave->dev->name);
2833 }
2834 }
2835 } else {
2836 /* slave->link == BOND_LINK_UP */
2837
2838 /* not all switches will respond to an arp request
2839 * when the source ip is 0, so don't take the link down
2840 * if we don't know our ip yet
2841 */
b63bb739 2842 if (time_after_eq(jiffies, slave->dev->trans_start + 2*delta_in_ticks) ||
4b8a9239 2843 (time_after_eq(jiffies, slave->dev->last_rx + 2*delta_in_ticks))) {
1da177e4
LT		 2844
2845 slave->link = BOND_LINK_DOWN;
2846 slave->state = BOND_STATE_BACKUP;
2847
2848 if (slave->link_failure_count < UINT_MAX) {
2849 slave->link_failure_count++;
2850 }
2851
2852 printk(KERN_INFO DRV_NAME
2853 ": %s: interface %s is now down.\n",
1b76b316 2854 bond->dev->name,
1da177e4
LT		 2855 slave->dev->name);
2856
2857 if (slave == oldcurrent) {
2858 do_failover = 1;
2859 }
2860 }
2861 }
2862
2863 /* note: if switch is in round-robin mode, all links
2864 * must tx arp to ensure all links rx an arp - otherwise
2865 * links may oscillate or not come up at all; if switch is
2866 * in something like xor mode, there is nothing we can
2867 * do - all replies will be rx'ed on same link causing slaves
2868 * to be unstable during low/no traffic periods
2869 */
2870 if (IS_UP(slave->dev)) {
2871 bond_arp_send_all(bond, slave);
2872 }
2873 }
2874
2875 if (do_failover) {
059fe7a5 2876 write_lock_bh(&bond->curr_slave_lock);
1da177e4
LT		 2877
2878 bond_select_active_slave(bond);
2879
059fe7a5 2880 write_unlock_bh(&bond->curr_slave_lock);
1da177e4
LT		 2881 }
2882
2883re_arm:
1b76b316
JV		 2884 if (bond->params.arp_interval)
2885 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
1da177e4
LT		 2886out:
2887 read_unlock(&bond->lock);
2888}
2889
2890/*
b2220cad
JV		 2891 * Called to inspect slaves for active-backup mode ARP monitor link state
2892 * changes. Sets new_link in slaves to specify what action should take
2893 * place for the slave. Returns 0 if no changes are found, >0 if changes
2894 * to link states must be committed.
2895 *
2896 * Called with bond->lock held for read.
1da177e4 2897 */
b2220cad 2898static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
1da177e4 2899{
1da177e4 2900 struct slave *slave;
b2220cad 2901 int i, commit = 0;
1da177e4 2902
b2220cad
JV		 2903 bond_for_each_slave(bond, slave, i) {
2904 slave->new_link = BOND_LINK_NOCHANGE;
1da177e4 2905
b2220cad
JV		 2906 if (slave->link != BOND_LINK_UP) {
2907 if (time_before_eq(jiffies, slave_last_rx(bond, slave) +
2908 delta_in_ticks)) {
2909 slave->new_link = BOND_LINK_UP;
2910 commit++;
2911 }
1da177e4 2912
b2220cad
JV		 2913 continue;
2914 }
1da177e4 2915
b2220cad
JV		 2916 /*
2917 * Give slaves 2*delta after being enslaved or made
2918 * active. This avoids bouncing, as the last receive
2919 * times need a full ARP monitor cycle to be updated.
2920 */
2921 if (!time_after_eq(jiffies, slave->jiffies +
2922 2 * delta_in_ticks))
2923 continue;
2924
2925 /*
2926 * Backup slave is down if:
2927 * - No current_arp_slave AND
2928 * - more than 3*delta since last receive AND
2929 * - the bond has an IP address
2930 *
2931 * Note: a non-null current_arp_slave indicates
2932 * the curr_active_slave went down and we are
2933 * searching for a new one; under this condition
2934 * we only take the curr_active_slave down - this
2935 * gives each slave a chance to tx/rx traffic
2936 * before being taken out
2937 */
2938 if (slave->state == BOND_STATE_BACKUP &&
2939 !bond->current_arp_slave &&
2940 time_after(jiffies, slave_last_rx(bond, slave) +
2941 3 * delta_in_ticks)) {
2942 slave->new_link = BOND_LINK_DOWN;
2943 commit++;
2944 }
2945
2946 /*
2947 * Active slave is down if:
2948 * - more than 2*delta since transmitting OR
2949 * - (more than 2*delta since receive AND
2950 * the bond has an IP address)
2951 */
2952 if ((slave->state == BOND_STATE_ACTIVE) &&
2953 (time_after_eq(jiffies, slave->dev->trans_start +
2954 2 * delta_in_ticks) ||
2955 (time_after_eq(jiffies, slave_last_rx(bond, slave)
2956 + 2 * delta_in_ticks)))) {
2957 slave->new_link = BOND_LINK_DOWN;
2958 commit++;
2959 }
1da177e4
LT		 2960 }
2961
b2220cad
JV		 2962 read_lock(&bond->curr_slave_lock);
2963
2964 /*
2965 * Trigger a commit if the primary option setting has changed.
1da177e4 2966 */
b2220cad
JV		 2967 if (bond->primary_slave &&
2968 (bond->primary_slave != bond->curr_active_slave) &&
2969 (bond->primary_slave->link == BOND_LINK_UP))
2970 commit++;
1da177e4 2971
b2220cad 2972 read_unlock(&bond->curr_slave_lock);
1da177e4 2973
b2220cad
JV		 2974 return commit;
2975}
1da177e4 2976
b2220cad
JV		 2977/*
2978 * Called to commit link state changes noted by inspection step of
2979 * active-backup mode ARP monitor.
2980 *
2981 * Called with RTNL and bond->lock for read.
2982 */
2983static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2984{
2985 struct slave *slave;
2986 int i;
1da177e4 2987
b2220cad
JV		 2988 bond_for_each_slave(bond, slave, i) {
2989 switch (slave->new_link) {
2990 case BOND_LINK_NOCHANGE:
2991 continue;
ff59c456 2992
b2220cad
JV		 2993 case BOND_LINK_UP:
2994 write_lock_bh(&bond->curr_slave_lock);
1da177e4 2995
b2220cad
JV		 2996 if (!bond->curr_active_slave &&
2997 time_before_eq(jiffies, slave->dev->trans_start +
2998 delta_in_ticks)) {
2999 slave->link = BOND_LINK_UP;
3000 bond_change_active_slave(bond, slave);
3001 bond->current_arp_slave = NULL;
3002
3003 printk(KERN_INFO DRV_NAME
3004 ": %s: %s is up and now the "
3005 "active interface\n",
3006 bond->dev->name, slave->dev->name);
3007
3008 } else if (bond->curr_active_slave != slave) {
3009 /* this slave has just come up but we
3010 * already have a current slave; this can
3011 * also happen if bond_enslave adds a new
3012 * slave that is up while we are searching
3013 * for a new slave
1da177e4 3014 */
b2220cad
JV		 3015 slave->link = BOND_LINK_UP;
3016 bond_set_slave_inactive_flags(slave);
3017 bond->current_arp_slave = NULL;
3018
3019 printk(KERN_INFO DRV_NAME
3020 ": %s: backup interface %s is now up\n",
3021 bond->dev->name, slave->dev->name);
3022 }
1da177e4 3023
b2220cad 3024 write_unlock_bh(&bond->curr_slave_lock);
1da177e4 3025
b2220cad 3026 break;
1da177e4 3027
b2220cad
JV		 3028 case BOND_LINK_DOWN:
3029 if (slave->link_failure_count < UINT_MAX)
3030 slave->link_failure_count++;
3031
3032 slave->link = BOND_LINK_DOWN;
3033
3034 if (slave == bond->curr_active_slave) {
3035 printk(KERN_INFO DRV_NAME
3036 ": %s: link status down for active "
3037 "interface %s, disabling it\n",
3038 bond->dev->name, slave->dev->name);
1da177e4
LT		 3039
3040 bond_set_slave_inactive_flags(slave);
3041
b2220cad
JV		 3042 write_lock_bh(&bond->curr_slave_lock);
3043
3044 bond_select_active_slave(bond);
3045 if (bond->curr_active_slave)
3046 bond->curr_active_slave->jiffies =
3047 jiffies;
3048
3049 write_unlock_bh(&bond->curr_slave_lock);
3050
3051 bond->current_arp_slave = NULL;
3052
3053 } else if (slave->state == BOND_STATE_BACKUP) {
1da177e4
LT		 3054 printk(KERN_INFO DRV_NAME
3055 ": %s: backup interface %s is now down\n",
b2220cad
JV		 3056 bond->dev->name, slave->dev->name);
3057
3058 bond_set_slave_inactive_flags(slave);
1da177e4 3059 }
b2220cad
JV		 3060 break;
3061
3062 default:
3063 printk(KERN_ERR DRV_NAME
3064 ": %s: impossible: new_link %d on slave %s\n",
3065 bond->dev->name, slave->new_link,
3066 slave->dev->name);
1da177e4
LT		 3067 }
3068 }
3069
b2220cad
JV		 3070 /*
3071 * No race with changes to primary via sysfs, as we hold rtnl.
3072 */
3073 if (bond->primary_slave &&
3074 (bond->primary_slave != bond->curr_active_slave) &&
3075 (bond->primary_slave->link == BOND_LINK_UP)) {
3076 write_lock_bh(&bond->curr_slave_lock);
3077 bond_change_active_slave(bond, bond->primary_slave);
3078 write_unlock_bh(&bond->curr_slave_lock);
3079 }
1da177e4 3080
b2220cad
JV		 3081 bond_set_carrier(bond);
3082}
1da177e4 3083
b2220cad
JV		 3084/*
3085 * Send ARP probes for active-backup mode ARP monitor.
3086 *
3087 * Called with bond->lock held for read.
3088 */
3089static void bond_ab_arp_probe(struct bonding *bond)
3090{
3091 struct slave *slave;
3092 int i;
1da177e4 3093
b2220cad 3094 read_lock(&bond->curr_slave_lock);
1da177e4 3095
b2220cad
JV		 3096 if (bond->current_arp_slave && bond->curr_active_slave)
3097 printk("PROBE: c_arp %s && cas %s BAD\n",
3098 bond->current_arp_slave->dev->name,
3099 bond->curr_active_slave->dev->name);
1da177e4 3100
b2220cad
JV		 3101 if (bond->curr_active_slave) {
3102 bond_arp_send_all(bond, bond->curr_active_slave);
3103 read_unlock(&bond->curr_slave_lock);
3104 return;
3105 }
1da177e4 3106
b2220cad 3107 read_unlock(&bond->curr_slave_lock);
059fe7a5 3108
b2220cad
JV		 3109 /* if we don't have a curr_active_slave, search for the next available
3110 * backup slave from the current_arp_slave and make it the candidate
3111 * for becoming the curr_active_slave
3112 */
1da177e4 3113
b2220cad
JV		 3114 if (!bond->current_arp_slave) {
3115 bond->current_arp_slave = bond->first_slave;
3116 if (!bond->current_arp_slave)
3117 return;
3118 }
1da177e4 3119
b2220cad 3120 bond_set_slave_inactive_flags(bond->current_arp_slave);
059fe7a5 3121
b2220cad
JV		 3122 /* search for next candidate */
3123 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3124 if (IS_UP(slave->dev)) {
3125 slave->link = BOND_LINK_BACK;
3126 bond_set_slave_active_flags(slave);
3127 bond_arp_send_all(bond, slave);
1da177e4 3128 slave->jiffies = jiffies;
b2220cad
JV		 3129 bond->current_arp_slave = slave;
3130 break;
1da177e4
LT		 3131 }
3132
b2220cad
JV		 3133 /* if the link state is up at this point, we
3134 * mark it down - this can happen if we have
3135 * simultaneous link failures and
3136 * reselect_active_interface doesn't make this
3137 * one the current slave so it is still marked
3138 * up when it is actually down
1da177e4 3139 */
b2220cad
JV		 3140 if (slave->link == BOND_LINK_UP) {
3141 slave->link = BOND_LINK_DOWN;
3142 if (slave->link_failure_count < UINT_MAX)
3143 slave->link_failure_count++;
1da177e4 3144
b2220cad
JV		 3145 bond_set_slave_inactive_flags(slave);
3146
3147 printk(KERN_INFO DRV_NAME
3148 ": %s: backup interface %s is now down.\n",
3149 bond->dev->name, slave->dev->name);
1da177e4 3150 }
b2220cad
JV		 3151 }
3152}
1da177e4 3153
b2220cad
JV		 3154void bond_activebackup_arp_mon(struct work_struct *work)
3155{
3156 struct bonding *bond = container_of(work, struct bonding,
3157 arp_work.work);
3158 int delta_in_ticks;
1da177e4 3159
b2220cad 3160 read_lock(&bond->lock);
1da177e4 3161
b2220cad
JV		 3162 if (bond->kill_timers)
3163 goto out;
1da177e4 3164
b2220cad 3165 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
1da177e4 3166
b2220cad
JV		 3167 if (bond->slave_cnt == 0)
3168 goto re_arm;
3169
b59f9f74
JV		 3170 if (bond->send_grat_arp) {
3171 read_lock(&bond->curr_slave_lock);
3172 bond_send_gratuitous_arp(bond);
3173 read_unlock(&bond->curr_slave_lock);
3174 }
3175
b2220cad
JV		 3176 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3177 read_unlock(&bond->lock);
3178 rtnl_lock();
3179 read_lock(&bond->lock);
3180
3181 bond_ab_arp_commit(bond, delta_in_ticks);
3182
3183 read_unlock(&bond->lock);
3184 rtnl_unlock();
3185 read_lock(&bond->lock);
1da177e4
LT		 3186 }
3187
b2220cad
JV		 3188 bond_ab_arp_probe(bond);
3189
1da177e4
LT		 3190re_arm:
3191 if (bond->params.arp_interval) {
1b76b316 3192 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
1da177e4
LT		 3193 }
3194out:
3195 read_unlock(&bond->lock);
3196}
3197
3198/*------------------------------ proc/seq_file-------------------------------*/
3199
3200#ifdef CONFIG_PROC_FS
3201
1da177e4
LT		 3202static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3203{
3204 struct bonding *bond = seq->private;
3205 loff_t off = 0;
3206 struct slave *slave;
3207 int i;
3208
3209 /* make sure the bond won't be taken away */
3210 read_lock(&dev_base_lock);
6603a6f2 3211 read_lock(&bond->lock);
1da177e4
LT		 3212
3213 if (*pos == 0) {
3214 return SEQ_START_TOKEN;
3215 }
3216
3217 bond_for_each_slave(bond, slave, i) {
3218 if (++off == *pos) {
3219 return slave;
3220 }
3221 }
3222
3223 return NULL;
3224}
3225
3226static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3227{
3228 struct bonding *bond = seq->private;
3229 struct slave *slave = v;
3230
3231 ++*pos;
3232 if (v == SEQ_START_TOKEN) {
3233 return bond->first_slave;
3234 }
3235
3236 slave = slave->next;
3237
3238 return (slave == bond->first_slave) ? NULL : slave;
3239}
3240
3241static void bond_info_seq_stop(struct seq_file *seq, void *v)
3242{
3243 struct bonding *bond = seq->private;
3244
6603a6f2 3245 read_unlock(&bond->lock);
1da177e4
LT		 3246 read_unlock(&dev_base_lock);
3247}
3248
3249static void bond_info_show_master(struct seq_file *seq)
3250{
3251 struct bonding *bond = seq->private;
3252 struct slave *curr;
4756b02f
MW		 3253 int i;
3254 u32 target;
1da177e4
LT		 3255
3256 read_lock(&bond->curr_slave_lock);
3257 curr = bond->curr_active_slave;
3258 read_unlock(&bond->curr_slave_lock);
3259
dd957c57 3260 seq_printf(seq, "Bonding Mode: %s",
1da177e4
LT		 3261 bond_mode_name(bond->params.mode));
3262
dd957c57
JV		 3263 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3264 bond->params.fail_over_mac)
3915c1e8
JV		 3265 seq_printf(seq, " (fail_over_mac %s)",
3266 fail_over_mac_tbl[bond->params.fail_over_mac].modename);
dd957c57
JV		 3267
3268 seq_printf(seq, "\n");
3269
c61b75ad
MW		 3270 if (bond->params.mode == BOND_MODE_XOR ||
3271 bond->params.mode == BOND_MODE_8023AD) {
3272 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3273 xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3274 bond->params.xmit_policy);
3275 }
3276
1da177e4
LT		 3277 if (USES_PRIMARY(bond->params.mode)) {
3278 seq_printf(seq, "Primary Slave: %s\n",
0f418b2a
MW		 3279 (bond->primary_slave) ?
3280 bond->primary_slave->dev->name : "None");
1da177e4
LT		 3281
3282 seq_printf(seq, "Currently Active Slave: %s\n",
3283 (curr) ? curr->dev->name : "None");
3284 }
3285
ff59c456
JV		 3286 seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3287 "up" : "down");
1da177e4
LT		 3288 seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3289 seq_printf(seq, "Up Delay (ms): %d\n",
3290 bond->params.updelay * bond->params.miimon);
3291 seq_printf(seq, "Down Delay (ms): %d\n",
3292 bond->params.downdelay * bond->params.miimon);
3293
4756b02f
MW		 3294
3295 /* ARP information */
3296 if(bond->params.arp_interval > 0) {
3297 int printed=0;
3298 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3299 bond->params.arp_interval);
3300
3301 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3302
3303 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
3304 if (!bond->params.arp_targets[i])
3305 continue;
3306 if (printed)
3307 seq_printf(seq, ",");
3308 target = ntohl(bond->params.arp_targets[i]);
3309 seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
3310 printed = 1;
3311 }
3312 seq_printf(seq, "\n");
3313 }
3314
1da177e4
LT		 3315 if (bond->params.mode == BOND_MODE_8023AD) {
3316 struct ad_info ad_info;
0795af57 3317 DECLARE_MAC_BUF(mac);
1da177e4
LT		 3318
3319 seq_puts(seq, "\n802.3ad info\n");
3320 seq_printf(seq, "LACP rate: %s\n",
3321 (bond->params.lacp_fast) ? "fast" : "slow");
3322
3323 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3324 seq_printf(seq, "bond %s has no active aggregator\n",
3325 bond->dev->name);
3326 } else {
3327 seq_printf(seq, "Active Aggregator Info:\n");
3328
3329 seq_printf(seq, "\tAggregator ID: %d\n",
3330 ad_info.aggregator_id);
3331 seq_printf(seq, "\tNumber of ports: %d\n",
3332 ad_info.ports);
3333 seq_printf(seq, "\tActor Key: %d\n",
3334 ad_info.actor_key);
3335 seq_printf(seq, "\tPartner Key: %d\n",
3336 ad_info.partner_key);
0795af57
JP		 3337 seq_printf(seq, "\tPartner Mac Address: %s\n",
3338 print_mac(mac, ad_info.partner_system));
1da177e4
LT		 3339 }
3340 }
3341}
3342
3343static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3344{
3345 struct bonding *bond = seq->private;
0795af57 3346 DECLARE_MAC_BUF(mac);
1da177e4
LT		 3347
3348 seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3349 seq_printf(seq, "MII Status: %s\n",
3350 (slave->link == BOND_LINK_UP) ? "up" : "down");
65509645 3351 seq_printf(seq, "Link Failure Count: %u\n",
1da177e4
LT		 3352 slave->link_failure_count);
3353
217df670 3354 seq_printf(seq,
0795af57
JP		 3355 "Permanent HW addr: %s\n",
3356 print_mac(mac, slave->perm_hwaddr));
1da177e4
LT		 3357
3358 if (bond->params.mode == BOND_MODE_8023AD) {
3359 const struct aggregator *agg
3360 = SLAVE_AD_INFO(slave).port.aggregator;
3361
3362 if (agg) {
3363 seq_printf(seq, "Aggregator ID: %d\n",
3364 agg->aggregator_identifier);
3365 } else {
3366 seq_puts(seq, "Aggregator ID: N/A\n");
3367 }
3368 }
3369}
3370
3371static int bond_info_seq_show(struct seq_file *seq, void *v)
3372{
3373 if (v == SEQ_START_TOKEN) {
3374 seq_printf(seq, "%s\n", version);
3375 bond_info_show_master(seq);
3376 } else {
3377 bond_info_show_slave(seq, v);
3378 }
3379
3380 return 0;
3381}
3382
3383static struct seq_operations bond_info_seq_ops = {
3384 .start = bond_info_seq_start,
3385 .next = bond_info_seq_next,
3386 .stop = bond_info_seq_stop,
3387 .show = bond_info_seq_show,
3388};
3389
3390static int bond_info_open(struct inode *inode, struct file *file)
3391{
3392 struct seq_file *seq;
3393 struct proc_dir_entry *proc;
3394 int res;
3395
3396 res = seq_open(file, &bond_info_seq_ops);
3397 if (!res) {
3398 /* recover the pointer buried in proc_dir_entry data */
3399 seq = file->private_data;
3400 proc = PDE(inode);
3401 seq->private = proc->data;
3402 }
3403
3404 return res;
3405}
3406
d54b1fdb 3407static const struct file_operations bond_info_fops = {
1da177e4
LT		 3408 .owner = THIS_MODULE,
3409 .open = bond_info_open,
3410 .read = seq_read,
3411 .llseek = seq_lseek,
3412 .release = seq_release,
3413};
3414
3415static int bond_create_proc_entry(struct bonding *bond)
3416{
3417 struct net_device *bond_dev = bond->dev;
3418
3419 if (bond_proc_dir) {
a95609cb
DL		 3420 bond->proc_entry = proc_create_data(bond_dev->name,
3421 S_IRUGO, bond_proc_dir,
3422 &bond_info_fops, bond);
1da177e4
LT		 3423 if (bond->proc_entry == NULL) {
3424 printk(KERN_WARNING DRV_NAME
3425 ": Warning: Cannot create /proc/net/%s/%s\n",
3426 DRV_NAME, bond_dev->name);
3427 } else {
1da177e4
LT		 3428 memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3429 }
3430 }
3431
3432 return 0;
3433}
3434
3435static void bond_remove_proc_entry(struct bonding *bond)
3436{
3437 if (bond_proc_dir && bond->proc_entry) {
3438 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3439 memset(bond->proc_file_name, 0, IFNAMSIZ);
3440 bond->proc_entry = NULL;
3441 }
3442}
3443
3444/* Create the bonding directory under /proc/net, if doesn't exist yet.
3445 * Caller must hold rtnl_lock.
3446 */
3447static void bond_create_proc_dir(void)
3448{
3449 int len = strlen(DRV_NAME);
3450
457c4cbc 3451 for (bond_proc_dir = init_net.proc_net->subdir; bond_proc_dir;
1da177e4
LT		 3452 bond_proc_dir = bond_proc_dir->next) {
3453 if ((bond_proc_dir->namelen == len) &&
3454 !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3455 break;
3456 }
3457 }
3458
3459 if (!bond_proc_dir) {
457c4cbc 3460 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
1da177e4
LT		 3461 if (bond_proc_dir) {
3462 bond_proc_dir->owner = THIS_MODULE;
3463 } else {
3464 printk(KERN_WARNING DRV_NAME
3465 ": Warning: cannot create /proc/net/%s\n",
3466 DRV_NAME);
3467 }
3468 }
3469}
3470
3471/* Destroy the bonding directory under /proc/net, if empty.
3472 * Caller must hold rtnl_lock.
3473 */
3474static void bond_destroy_proc_dir(void)
3475{
3476 struct proc_dir_entry *de;
3477
3478 if (!bond_proc_dir) {
3479 return;
3480 }
3481
3482 /* verify that the /proc dir is empty */
3483 for (de = bond_proc_dir->subdir; de; de = de->next) {
3484 /* ignore . and .. */
3485 if (*(de->name) != '.') {
3486 break;
3487 }
3488 }
3489
3490 if (de) {
3491 if (bond_proc_dir->owner == THIS_MODULE) {
3492 bond_proc_dir->owner = NULL;
3493 }
3494 } else {
457c4cbc 3495 remove_proc_entry(DRV_NAME, init_net.proc_net);
1da177e4
LT		 3496 bond_proc_dir = NULL;
3497 }
3498}
3499#endif /* CONFIG_PROC_FS */
3500
3501/*-------------------------- netdev event handling --------------------------*/
3502
3503/*
3504 * Change device name
3505 */
3506static int bond_event_changename(struct bonding *bond)
3507{
3508#ifdef CONFIG_PROC_FS
3509 bond_remove_proc_entry(bond);
3510 bond_create_proc_entry(bond);
3511#endif
b76cdba9
MW		 3512 down_write(&(bonding_rwsem));
3513 bond_destroy_sysfs_entry(bond);
3514 bond_create_sysfs_entry(bond);
3515 up_write(&(bonding_rwsem));
1da177e4
LT		 3516 return NOTIFY_DONE;
3517}
3518
3519static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3520{
3521 struct bonding *event_bond = bond_dev->priv;
3522
3523 switch (event) {
3524 case NETDEV_CHANGENAME:
3525 return bond_event_changename(event_bond);
3526 case NETDEV_UNREGISTER:
3b96c858 3527 bond_release_all(event_bond->dev);
1da177e4
LT		 3528 break;
3529 default:
3530 break;
3531 }
3532
3533 return NOTIFY_DONE;
3534}
3535
3536static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3537{
3538 struct net_device *bond_dev = slave_dev->master;
8531c5ff 3539 struct bonding *bond = bond_dev->priv;
1da177e4
LT		 3540
3541 switch (event) {
3542 case NETDEV_UNREGISTER:
3543 if (bond_dev) {
1284cd3a
JV		 3544 if (bond->setup_by_slave)
3545 bond_release_and_destroy(bond_dev, slave_dev);
3546 else
3547 bond_release(bond_dev, slave_dev);
1da177e4
LT		 3548 }
3549 break;
3550 case NETDEV_CHANGE:
3551 /*
3552 * TODO: is this what we get if somebody
3553 * sets up a hierarchical bond, then rmmod's
3554 * one of the slave bonding devices?
3555 */
3556 break;
3557 case NETDEV_DOWN:
3558 /*
3559 * ... Or is it this?
3560 */
3561 break;
3562 case NETDEV_CHANGEMTU:
3563 /*
3564 * TODO: Should slaves be allowed to
3565 * independently alter their MTU? For
3566 * an active-backup bond, slaves need
3567 * not be the same type of device, so
3568 * MTUs may vary. For other modes,
3569 * slaves arguably should have the
3570 * same MTUs. To do this, we'd need to
3571 * take over the slave's change_mtu
3572 * function for the duration of their
3573 * servitude.
3574 */
3575 break;
3576 case NETDEV_CHANGENAME:
3577 /*
3578 * TODO: handle changing the primary's name
3579 */
3580 break;
8531c5ff
AK		 3581 case NETDEV_FEAT_CHANGE:
3582 bond_compute_features(bond);
3583 break;
1da177e4
LT		 3584 default:
3585 break;
3586 }
3587
3588 return NOTIFY_DONE;
3589}
3590
3591/*
3592 * bond_netdev_event: handle netdev notifier chain events.
3593 *
3594 * This function receives events for the netdev chain. The caller (an
e041c683 3595 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
1da177e4
LT		 3596 * locks for us to safely manipulate the slave devices (RTNL lock,
3597 * dev_probe_lock).
3598 */
3599static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3600{
3601 struct net_device *event_dev = (struct net_device *)ptr;
3602
c346dca1 3603 if (dev_net(event_dev) != &init_net)
e9dc8653
EB		 3604 return NOTIFY_DONE;
3605
1da177e4
LT		 3606 dprintk("event_dev: %s, event: %lx\n",
3607 (event_dev ? event_dev->name : "None"),
3608 event);
3609
0b680e75
JV		 3610 if (!(event_dev->priv_flags & IFF_BONDING))
3611 return NOTIFY_DONE;
3612
1da177e4
LT		 3613 if (event_dev->flags & IFF_MASTER) {
3614 dprintk("IFF_MASTER\n");
3615 return bond_master_netdev_event(event, event_dev);
3616 }
3617
3618 if (event_dev->flags & IFF_SLAVE) {
3619 dprintk("IFF_SLAVE\n");
3620 return bond_slave_netdev_event(event, event_dev);
3621 }
3622
3623 return NOTIFY_DONE;
3624}
3625
c3ade5ca
JV		 3626/*
3627 * bond_inetaddr_event: handle inetaddr notifier chain events.
3628 *
3629 * We keep track of device IPs primarily to use as source addresses in
3630 * ARP monitor probes (rather than spewing out broadcasts all the time).
3631 *
3632 * We track one IP for the main device (if it has one), plus one per VLAN.
3633 */
3634static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3635{
3636 struct in_ifaddr *ifa = ptr;
3637 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
0883beca
PE		 3638 struct bonding *bond;
3639 struct vlan_entry *vlan;
c3ade5ca 3640
c346dca1 3641 if (dev_net(ifa->ifa_dev->dev) != &init_net)
6133fb1a
DL		 3642 return NOTIFY_DONE;
3643
0883beca 3644 list_for_each_entry(bond, &bond_dev_list, bond_list) {
c3ade5ca
JV		 3645 if (bond->dev == event_dev) {
3646 switch (event) {
3647 case NETDEV_UP:
3648 bond->master_ip = ifa->ifa_local;
3649 return NOTIFY_OK;
3650 case NETDEV_DOWN:
3651 bond->master_ip = bond_glean_dev_ip(bond->dev);
3652 return NOTIFY_OK;
3653 default:
3654 return NOTIFY_DONE;
3655 }
3656 }
3657
0883beca 3658 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
5c15bdec 3659 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
c3ade5ca
JV		 3660 if (vlan_dev == event_dev) {
3661 switch (event) {
3662 case NETDEV_UP:
3663 vlan->vlan_ip = ifa->ifa_local;
3664 return NOTIFY_OK;
3665 case NETDEV_DOWN:
3666 vlan->vlan_ip =
3667 bond_glean_dev_ip(vlan_dev);
3668 return NOTIFY_OK;
3669 default:
3670 return NOTIFY_DONE;
3671 }
3672 }
3673 }
3674 }
3675 return NOTIFY_DONE;
3676}
3677
1da177e4
LT		 3678static struct notifier_block bond_netdev_notifier = {
3679 .notifier_call = bond_netdev_event,
3680};
3681
c3ade5ca
JV		 3682static struct notifier_block bond_inetaddr_notifier = {
3683 .notifier_call = bond_inetaddr_event,
3684};
3685
1da177e4
LT		 3686/*-------------------------- Packet type handling ---------------------------*/
3687
3688/* register to receive lacpdus on a bond */
3689static void bond_register_lacpdu(struct bonding *bond)
3690{
3691 struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3692
3693 /* initialize packet type */
3694 pk_type->type = PKT_TYPE_LACPDU;
3695 pk_type->dev = bond->dev;
3696 pk_type->func = bond_3ad_lacpdu_recv;
3697
3698 dev_add_pack(pk_type);
3699}
3700
3701/* unregister to receive lacpdus on a bond */
3702static void bond_unregister_lacpdu(struct bonding *bond)
3703{
3704 dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3705}
3706
f5b2b966
JV		 3707void bond_register_arp(struct bonding *bond)
3708{
3709 struct packet_type *pt = &bond->arp_mon_pt;
3710
c4f283b1
JV		 3711 if (pt->type)
3712 return;
3713
f5b2b966 3714 pt->type = htons(ETH_P_ARP);
e245cb71 3715 pt->dev = bond->dev;
f5b2b966
JV		 3716 pt->func = bond_arp_rcv;
3717 dev_add_pack(pt);
3718}
3719
3720void bond_unregister_arp(struct bonding *bond)
3721{
c4f283b1
JV		 3722 struct packet_type *pt = &bond->arp_mon_pt;
3723
3724 dev_remove_pack(pt);
3725 pt->type = 0;
f5b2b966
JV		 3726}
3727
169a3e66
JV		 3728/*---------------------------- Hashing Policies -----------------------------*/
3729
6f6652be
JV		 3730/*
3731 * Hash for the output device based upon layer 2 and layer 3 data. If
3732 * the packet is not IP mimic bond_xmit_hash_policy_l2()
3733 */
3734static int bond_xmit_hash_policy_l23(struct sk_buff *skb,
3735 struct net_device *bond_dev, int count)
3736{
3737 struct ethhdr *data = (struct ethhdr *)skb->data;
3738 struct iphdr *iph = ip_hdr(skb);
3739
3740 if (skb->protocol == __constant_htons(ETH_P_IP)) {
3741 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3742 (data->h_dest[5] ^ bond_dev->dev_addr[5])) % count;
3743 }
3744
3745 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3746}
3747
169a3e66 3748/*
59c51591 3749 * Hash for the output device based upon layer 3 and layer 4 data. If
169a3e66
JV		 3750 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3751 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3752 */
3753static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3754 struct net_device *bond_dev, int count)
3755{
3756 struct ethhdr *data = (struct ethhdr *)skb->data;
eddc9ec5 3757 struct iphdr *iph = ip_hdr(skb);
d3bb52b0 3758 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
169a3e66
JV		 3759 int layer4_xor = 0;
3760
3761 if (skb->protocol == __constant_htons(ETH_P_IP)) {
3762 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3763 (iph->protocol == IPPROTO_TCP ||
3764 iph->protocol == IPPROTO_UDP)) {
d3bb52b0 3765 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
169a3e66
JV		 3766 }
3767 return (layer4_xor ^
3768 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3769
3770 }
3771
3772 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3773}
3774
3775/*
3776 * Hash for the output device based upon layer 2 data
3777 */
3778static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3779 struct net_device *bond_dev, int count)
3780{
3781 struct ethhdr *data = (struct ethhdr *)skb->data;
3782
3783 return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3784}
3785
1da177e4
LT		 3786/*-------------------------- Device entry points ----------------------------*/
3787
3788static int bond_open(struct net_device *bond_dev)
3789{
3790 struct bonding *bond = bond_dev->priv;
1da177e4
LT		 3791
3792 bond->kill_timers = 0;
3793
3794 if ((bond->params.mode == BOND_MODE_TLB) ||
3795 (bond->params.mode == BOND_MODE_ALB)) {
1da177e4
LT		 3796 /* bond_alb_initialize must be called before the timer
3797 * is started.
3798 */
3799 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3800 /* something went wrong - fail the open operation */
3801 return -1;
3802 }
3803
1b76b316
JV		 3804 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3805 queue_delayed_work(bond->wq, &bond->alb_work, 0);
1da177e4
LT		 3806 }
3807
3808 if (bond->params.miimon) { /* link check interval, in milliseconds. */
1b76b316
JV		 3809 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3810 queue_delayed_work(bond->wq, &bond->mii_work, 0);
1da177e4
LT		 3811 }
3812
3813 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
1b76b316
JV		 3814 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3815 INIT_DELAYED_WORK(&bond->arp_work,
3816 bond_activebackup_arp_mon);
3817 else
3818 INIT_DELAYED_WORK(&bond->arp_work,
3819 bond_loadbalance_arp_mon);
3820
3821 queue_delayed_work(bond->wq, &bond->arp_work, 0);
f5b2b966
JV		 3822 if (bond->params.arp_validate)
3823 bond_register_arp(bond);
1da177e4
LT		 3824 }
3825
3826 if (bond->params.mode == BOND_MODE_8023AD) {
a40745f5 3827 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
1b76b316 3828 queue_delayed_work(bond->wq, &bond->ad_work, 0);
1da177e4
LT		 3829 /* register to receive LACPDUs */
3830 bond_register_lacpdu(bond);
3831 }
3832
3833 return 0;
3834}
3835
3836static int bond_close(struct net_device *bond_dev)
3837{
3838 struct bonding *bond = bond_dev->priv;
3839
3840 if (bond->params.mode == BOND_MODE_8023AD) {
3841 /* Unregister the receive of LACPDUs */
3842 bond_unregister_lacpdu(bond);
3843 }
3844
f5b2b966
JV		 3845 if (bond->params.arp_validate)
3846 bond_unregister_arp(bond);
3847
1da177e4
LT		 3848 write_lock_bh(&bond->lock);
3849
b59f9f74 3850 bond->send_grat_arp = 0;
1da177e4
LT		 3851
3852 /* signal timers not to re-arm */
3853 bond->kill_timers = 1;
3854
3855 write_unlock_bh(&bond->lock);
3856
1da177e4 3857 if (bond->params.miimon) { /* link check interval, in milliseconds. */
1b76b316 3858 cancel_delayed_work(&bond->mii_work);
1da177e4
LT		 3859 }
3860
3861 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
1b76b316 3862 cancel_delayed_work(&bond->arp_work);
1da177e4
LT		 3863 }
3864
3865 switch (bond->params.mode) {
3866 case BOND_MODE_8023AD:
1b76b316 3867 cancel_delayed_work(&bond->ad_work);
1da177e4
LT		 3868 break;
3869 case BOND_MODE_TLB:
3870 case BOND_MODE_ALB:
1b76b316 3871 cancel_delayed_work(&bond->alb_work);
1da177e4
LT		 3872 break;
3873 default:
3874 break;
3875 }
3876
1da177e4
LT		 3877
3878 if ((bond->params.mode == BOND_MODE_TLB) ||
3879 (bond->params.mode == BOND_MODE_ALB)) {
3880 /* Must be called only after all
3881 * slaves have been released
3882 */
3883 bond_alb_deinitialize(bond);
3884 }
3885
3886 return 0;
3887}
3888
3889static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3890{
3891 struct bonding *bond = bond_dev->priv;
3892 struct net_device_stats *stats = &(bond->stats), *sstats;
2439f9eb 3893 struct net_device_stats local_stats;
1da177e4
LT		 3894 struct slave *slave;
3895 int i;
3896
2439f9eb 3897 memset(&local_stats, 0, sizeof(struct net_device_stats));
1da177e4
LT		 3898
3899 read_lock_bh(&bond->lock);
3900
3901 bond_for_each_slave(bond, slave, i) {
c45d286e 3902 sstats = slave->dev->get_stats(slave->dev);
2439f9eb
AG		 3903 local_stats.rx_packets += sstats->rx_packets;
3904 local_stats.rx_bytes += sstats->rx_bytes;
3905 local_stats.rx_errors += sstats->rx_errors;
3906 local_stats.rx_dropped += sstats->rx_dropped;
3907
3908 local_stats.tx_packets += sstats->tx_packets;
3909 local_stats.tx_bytes += sstats->tx_bytes;
3910 local_stats.tx_errors += sstats->tx_errors;
3911 local_stats.tx_dropped += sstats->tx_dropped;
3912
3913 local_stats.multicast += sstats->multicast;
3914 local_stats.collisions += sstats->collisions;
3915
3916 local_stats.rx_length_errors += sstats->rx_length_errors;
3917 local_stats.rx_over_errors += sstats->rx_over_errors;
3918 local_stats.rx_crc_errors += sstats->rx_crc_errors;
3919 local_stats.rx_frame_errors += sstats->rx_frame_errors;
3920 local_stats.rx_fifo_errors += sstats->rx_fifo_errors;
3921 local_stats.rx_missed_errors += sstats->rx_missed_errors;
3922
3923 local_stats.tx_aborted_errors += sstats->tx_aborted_errors;
3924 local_stats.tx_carrier_errors += sstats->tx_carrier_errors;
3925 local_stats.tx_fifo_errors += sstats->tx_fifo_errors;
3926 local_stats.tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3927 local_stats.tx_window_errors += sstats->tx_window_errors;
3928 }
3929
3930 memcpy(stats, &local_stats, sizeof(struct net_device_stats));
1da177e4
LT		 3931
3932 read_unlock_bh(&bond->lock);
3933
3934 return stats;
3935}
3936
3937static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3938{
3939 struct net_device *slave_dev = NULL;
3940 struct ifbond k_binfo;
3941 struct ifbond __user *u_binfo = NULL;
3942 struct ifslave k_sinfo;
3943 struct ifslave __user *u_sinfo = NULL;
3944 struct mii_ioctl_data *mii = NULL;
1da177e4
LT		 3945 int res = 0;
3946
3947 dprintk("bond_ioctl: master=%s, cmd=%d\n",
3948 bond_dev->name, cmd);
3949
3950 switch (cmd) {
1da177e4
LT		 3951 case SIOCGMIIPHY:
3952 mii = if_mii(ifr);
3953 if (!mii) {
3954 return -EINVAL;
3955 }
3956 mii->phy_id = 0;
3957 /* Fall Through */
3958 case SIOCGMIIREG:
3959 /*
3960 * We do this again just in case we were called by SIOCGMIIREG
3961 * instead of SIOCGMIIPHY.
3962 */
3963 mii = if_mii(ifr);
3964 if (!mii) {
3965 return -EINVAL;
3966 }
3967
3968 if (mii->reg_num == 1) {
3969 struct bonding *bond = bond_dev->priv;
3970 mii->val_out = 0;
6603a6f2 3971 read_lock(&bond->lock);
1da177e4 3972 read_lock(&bond->curr_slave_lock);
4e140079 3973 if (netif_carrier_ok(bond->dev)) {
1da177e4
LT		 3974 mii->val_out = BMSR_LSTATUS;
3975 }
3976 read_unlock(&bond->curr_slave_lock);
6603a6f2 3977 read_unlock(&bond->lock);
1da177e4
LT		 3978 }
3979
3980 return 0;
3981 case BOND_INFO_QUERY_OLD:
3982 case SIOCBONDINFOQUERY:
3983 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3984
3985 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3986 return -EFAULT;
3987 }
3988
3989 res = bond_info_query(bond_dev, &k_binfo);
3990 if (res == 0) {
3991 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3992 return -EFAULT;
3993 }
3994 }
3995
3996 return res;
3997 case BOND_SLAVE_INFO_QUERY_OLD:
3998 case SIOCBONDSLAVEINFOQUERY:
3999 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
4000
4001 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
4002 return -EFAULT;
4003 }
4004
4005 res = bond_slave_info_query(bond_dev, &k_sinfo);
4006 if (res == 0) {
4007 if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
4008 return -EFAULT;
4009 }
4010 }
4011
4012 return res;
4013 default:
4014 /* Go on */
4015 break;
4016 }
4017
4018 if (!capable(CAP_NET_ADMIN)) {
4019 return -EPERM;
4020 }
4021
b76cdba9 4022 down_write(&(bonding_rwsem));
881d966b 4023 slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
1da177e4
LT		 4024
4025 dprintk("slave_dev=%p: \n", slave_dev);
4026
4027 if (!slave_dev) {
4028 res = -ENODEV;
4029 } else {
4030 dprintk("slave_dev->name=%s: \n", slave_dev->name);
4031 switch (cmd) {
4032 case BOND_ENSLAVE_OLD:
4033 case SIOCBONDENSLAVE:
4034 res = bond_enslave(bond_dev, slave_dev);
4035 break;
4036 case BOND_RELEASE_OLD:
4037 case SIOCBONDRELEASE:
4038 res = bond_release(bond_dev, slave_dev);
4039 break;
4040 case BOND_SETHWADDR_OLD:
4041 case SIOCBONDSETHWADDR:
4042 res = bond_sethwaddr(bond_dev, slave_dev);
4043 break;
4044 case BOND_CHANGE_ACTIVE_OLD:
4045 case SIOCBONDCHANGEACTIVE:
4046 res = bond_ioctl_change_active(bond_dev, slave_dev);
4047 break;
4048 default:
4049 res = -EOPNOTSUPP;
4050 }
4051
4052 dev_put(slave_dev);
4053 }
4054
b76cdba9 4055 up_write(&(bonding_rwsem));
1da177e4
LT		 4056 return res;
4057}
4058
4059static void bond_set_multicast_list(struct net_device *bond_dev)
4060{
4061 struct bonding *bond = bond_dev->priv;
4062 struct dev_mc_list *dmi;
4063
1da177e4
LT		 4064 /*
4065 * Do promisc before checking multicast_mode
4066 */
4067 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
4068 bond_set_promiscuity(bond, 1);
4069 }
4070
4071 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
4072 bond_set_promiscuity(bond, -1);
4073 }
4074
4075 /* set allmulti flag to slaves */
4076 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
4077 bond_set_allmulti(bond, 1);
4078 }
4079
4080 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
4081 bond_set_allmulti(bond, -1);
4082 }
4083
80ee5ad2
JV		 4084 read_lock(&bond->lock);
4085
1da177e4
LT		 4086 bond->flags = bond_dev->flags;
4087
4088 /* looking for addresses to add to slaves' mc list */
4089 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
4090 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
4091 bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4092 }
4093 }
4094
4095 /* looking for addresses to delete from slaves' list */
4096 for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
4097 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
4098 bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4099 }
4100 }
4101
4102 /* save master's multicast list */
4103 bond_mc_list_destroy(bond);
4104 bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
4105
80ee5ad2 4106 read_unlock(&bond->lock);
1da177e4
LT		 4107}
4108
4109/*
4110 * Change the MTU of all of a master's slaves to match the master
4111 */
4112static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4113{
4114 struct bonding *bond = bond_dev->priv;
4115 struct slave *slave, *stop_at;
4116 int res = 0;
4117 int i;
4118
4119 dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
4120 (bond_dev ? bond_dev->name : "None"), new_mtu);
4121
4122 /* Can't hold bond->lock with bh disabled here since
4123 * some base drivers panic. On the other hand we can't
4124 * hold bond->lock without bh disabled because we'll
4125 * deadlock. The only solution is to rely on the fact
4126 * that we're under rtnl_lock here, and the slaves
4127 * list won't change. This doesn't solve the problem
4128 * of setting the slave's MTU while it is
4129 * transmitting, but the assumption is that the base
4130 * driver can handle that.
4131 *
4132 * TODO: figure out a way to safely iterate the slaves
4133 * list, but without holding a lock around the actual
4134 * call to the base driver.
4135 */
4136
4137 bond_for_each_slave(bond, slave, i) {
4138 dprintk("s %p s->p %p c_m %p\n", slave,
4139 slave->prev, slave->dev->change_mtu);
e944ef79 4140
1da177e4
LT		 4141 res = dev_set_mtu(slave->dev, new_mtu);
4142
4143 if (res) {
4144 /* If we failed to set the slave's mtu to the new value
4145 * we must abort the operation even in ACTIVE_BACKUP
4146 * mode, because if we allow the backup slaves to have
4147 * different mtu values than the active slave we'll
4148 * need to change their mtu when doing a failover. That
4149 * means changing their mtu from timer context, which
4150 * is probably not a good idea.
4151 */
4152 dprintk("err %d %s\n", res, slave->dev->name);
4153 goto unwind;
4154 }
4155 }
4156
4157 bond_dev->mtu = new_mtu;
4158
4159 return 0;
4160
4161unwind:
4162 /* unwind from head to the slave that failed */
4163 stop_at = slave;
4164 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4165 int tmp_res;
4166
4167 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4168 if (tmp_res) {
4169 dprintk("unwind err %d dev %s\n", tmp_res,
4170 slave->dev->name);
4171 }
4172 }
4173
4174 return res;
4175}
4176
4177/*
4178 * Change HW address
4179 *
4180 * Note that many devices must be down to change the HW address, and
4181 * downing the master releases all slaves. We can make bonds full of
4182 * bonding devices to test this, however.
4183 */
4184static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4185{
4186 struct bonding *bond = bond_dev->priv;
4187 struct sockaddr *sa = addr, tmp_sa;
4188 struct slave *slave, *stop_at;
4189 int res = 0;
4190 int i;
4191
4192 dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
4193
dd957c57 4194 /*
3915c1e8
JV		 4195 * If fail_over_mac is set to active, do nothing and return
4196 * success. Returning an error causes ifenslave to fail.
dd957c57 4197 */
3915c1e8 4198 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
dd957c57 4199 return 0;
2ab82852 4200
1da177e4
LT		 4201 if (!is_valid_ether_addr(sa->sa_data)) {
4202 return -EADDRNOTAVAIL;
4203 }
4204
4205 /* Can't hold bond->lock with bh disabled here since
4206 * some base drivers panic. On the other hand we can't
4207 * hold bond->lock without bh disabled because we'll
4208 * deadlock. The only solution is to rely on the fact
4209 * that we're under rtnl_lock here, and the slaves
4210 * list won't change. This doesn't solve the problem
4211 * of setting the slave's hw address while it is
4212 * transmitting, but the assumption is that the base
4213 * driver can handle that.
4214 *
4215 * TODO: figure out a way to safely iterate the slaves
4216 * list, but without holding a lock around the actual
4217 * call to the base driver.
4218 */
4219
4220 bond_for_each_slave(bond, slave, i) {
4221 dprintk("slave %p %s\n", slave, slave->dev->name);
4222
4223 if (slave->dev->set_mac_address == NULL) {
4224 res = -EOPNOTSUPP;
4225 dprintk("EOPNOTSUPP %s\n", slave->dev->name);
4226 goto unwind;
4227 }
4228
4229 res = dev_set_mac_address(slave->dev, addr);
4230 if (res) {
4231 /* TODO: consider downing the slave
4232 * and retry ?
4233 * User should expect communications
4234 * breakage anyway until ARP finish
4235 * updating, so...
4236 */
4237 dprintk("err %d %s\n", res, slave->dev->name);
4238 goto unwind;
4239 }
4240 }
4241
4242 /* success */
4243 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4244 return 0;
4245
4246unwind:
4247 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4248 tmp_sa.sa_family = bond_dev->type;
4249
4250 /* unwind from head to the slave that failed */
4251 stop_at = slave;
4252 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4253 int tmp_res;
4254
4255 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4256 if (tmp_res) {
4257 dprintk("unwind err %d dev %s\n", tmp_res,
4258 slave->dev->name);
4259 }
4260 }
4261
4262 return res;
4263}
4264
4265static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4266{
4267 struct bonding *bond = bond_dev->priv;
4268 struct slave *slave, *start_at;
cf5f9044 4269 int i, slave_no, res = 1;
1da177e4
LT		 4270
4271 read_lock(&bond->lock);
4272
4273 if (!BOND_IS_OK(bond)) {
4274 goto out;
4275 }
4276
cf5f9044
JV		 4277 /*
4278 * Concurrent TX may collide on rr_tx_counter; we accept that
4279 * as being rare enough not to justify using an atomic op here
4280 */
4281 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
1da177e4 4282
cf5f9044
JV		 4283 bond_for_each_slave(bond, slave, i) {
4284 slave_no--;
4285 if (slave_no < 0) {
4286 break;
4287 }
1da177e4
LT		 4288 }
4289
cf5f9044 4290 start_at = slave;
1da177e4
LT		 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 res = bond_dev_queue_xmit(bond, skb, slave->dev);
1da177e4
LT		 4296 break;
4297 }
4298 }
4299
1da177e4
LT		 4300out:
4301 if (res) {
4302 /* no suitable interface, frame not sent */
4303 dev_kfree_skb(skb);
4304 }
4305 read_unlock(&bond->lock);
4306 return 0;
4307}
4308
075897ce 4309
1da177e4
LT		 4310/*
4311 * in active-backup mode, we know that bond->curr_active_slave is always valid if
4312 * the bond has a usable interface.
4313 */
4314static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4315{
4316 struct bonding *bond = bond_dev->priv;
4317 int res = 1;
4318
1da177e4
LT		 4319 read_lock(&bond->lock);
4320 read_lock(&bond->curr_slave_lock);
4321
4322 if (!BOND_IS_OK(bond)) {
4323 goto out;
4324 }
4325
075897ce
JL		 4326 if (!bond->curr_active_slave)
4327 goto out;
4328
075897ce
JL		 4329 res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4330
1da177e4
LT		 4331out:
4332 if (res) {
4333 /* no suitable interface, frame not sent */
4334 dev_kfree_skb(skb);
4335 }
4336 read_unlock(&bond->curr_slave_lock);
4337 read_unlock(&bond->lock);
4338 return 0;
4339}
4340
4341/*
169a3e66
JV		 4342 * In bond_xmit_xor() , we determine the output device by using a pre-
4343 * determined xmit_hash_policy(), If the selected device is not enabled,
4344 * find the next active slave.
1da177e4
LT		 4345 */
4346static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4347{
4348 struct bonding *bond = bond_dev->priv;
1da177e4
LT		 4349 struct slave *slave, *start_at;
4350 int slave_no;
4351 int i;
4352 int res = 1;
4353
4354 read_lock(&bond->lock);
4355
4356 if (!BOND_IS_OK(bond)) {
4357 goto out;
4358 }
4359
169a3e66 4360 slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
1da177e4
LT		 4361
4362 bond_for_each_slave(bond, slave, i) {
4363 slave_no--;
4364 if (slave_no < 0) {
4365 break;
4366 }
4367 }
4368
4369 start_at = slave;
4370
4371 bond_for_each_slave_from(bond, slave, i, start_at) {
4372 if (IS_UP(slave->dev) &&
4373 (slave->link == BOND_LINK_UP) &&
4374 (slave->state == BOND_STATE_ACTIVE)) {
4375 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4376 break;
4377 }
4378 }
4379
4380out:
4381 if (res) {
4382 /* no suitable interface, frame not sent */
4383 dev_kfree_skb(skb);
4384 }
4385 read_unlock(&bond->lock);
4386 return 0;
4387}
4388
4389/*
4390 * in broadcast mode, we send everything to all usable interfaces.
4391 */
4392static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4393{
4394 struct bonding *bond = bond_dev->priv;
4395 struct slave *slave, *start_at;
4396 struct net_device *tx_dev = NULL;
4397 int i;
4398 int res = 1;
4399
4400 read_lock(&bond->lock);
4401
4402 if (!BOND_IS_OK(bond)) {
4403 goto out;
4404 }
4405
4406 read_lock(&bond->curr_slave_lock);
4407 start_at = bond->curr_active_slave;
4408 read_unlock(&bond->curr_slave_lock);
4409
4410 if (!start_at) {
4411 goto out;
4412 }
4413
4414 bond_for_each_slave_from(bond, slave, i, start_at) {
4415 if (IS_UP(slave->dev) &&
4416 (slave->link == BOND_LINK_UP) &&
4417 (slave->state == BOND_STATE_ACTIVE)) {
4418 if (tx_dev) {
4419 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4420 if (!skb2) {
4421 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 4422 ": %s: Error: bond_xmit_broadcast(): "
4423 "skb_clone() failed\n",
4424 bond_dev->name);
1da177e4
LT		 4425 continue;
4426 }
4427
4428 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4429 if (res) {
4430 dev_kfree_skb(skb2);
4431 continue;
4432 }
4433 }
4434 tx_dev = slave->dev;
4435 }
4436 }
4437
4438 if (tx_dev) {
4439 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4440 }
4441
4442out:
4443 if (res) {
4444 /* no suitable interface, frame not sent */
4445 dev_kfree_skb(skb);
4446 }
4447 /* frame sent to all suitable interfaces */
4448 read_unlock(&bond->lock);
4449 return 0;
4450}
4451
4452/*------------------------- Device initialization ---------------------------*/
4453
6f6652be
JV		 4454static void bond_set_xmit_hash_policy(struct bonding *bond)
4455{
4456 switch (bond->params.xmit_policy) {
4457 case BOND_XMIT_POLICY_LAYER23:
4458 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4459 break;
4460 case BOND_XMIT_POLICY_LAYER34:
4461 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4462 break;
4463 case BOND_XMIT_POLICY_LAYER2:
4464 default:
4465 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4466 break;
4467 }
4468}
4469
1da177e4
LT		 4470/*
4471 * set bond mode specific net device operations
4472 */
a77b5325 4473void bond_set_mode_ops(struct bonding *bond, int mode)
1da177e4 4474{
169a3e66
JV		 4475 struct net_device *bond_dev = bond->dev;
4476
1da177e4
LT		 4477 switch (mode) {
4478 case BOND_MODE_ROUNDROBIN:
4479 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4480 break;
4481 case BOND_MODE_ACTIVEBACKUP:
4482 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4483 break;
4484 case BOND_MODE_XOR:
4485 bond_dev->hard_start_xmit = bond_xmit_xor;
6f6652be 4486 bond_set_xmit_hash_policy(bond);
1da177e4
LT		 4487 break;
4488 case BOND_MODE_BROADCAST:
4489 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4490 break;
4491 case BOND_MODE_8023AD:
8f903c70 4492 bond_set_master_3ad_flags(bond);
1da177e4 4493 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
6f6652be 4494 bond_set_xmit_hash_policy(bond);
1da177e4 4495 break;
1da177e4 4496 case BOND_MODE_ALB:
8f903c70
JV		 4497 bond_set_master_alb_flags(bond);
4498 /* FALLTHRU */
4499 case BOND_MODE_TLB:
1da177e4
LT		 4500 bond_dev->hard_start_xmit = bond_alb_xmit;
4501 bond_dev->set_mac_address = bond_alb_set_mac_address;
4502 break;
4503 default:
4504 /* Should never happen, mode already checked */
4505 printk(KERN_ERR DRV_NAME
4e0952c7
MW		 4506 ": %s: Error: Unknown bonding mode %d\n",
4507 bond_dev->name,
1da177e4
LT		 4508 mode);
4509 break;
4510 }
4511}
4512
217df670
JV		 4513static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4514 struct ethtool_drvinfo *drvinfo)
4515{
4516 strncpy(drvinfo->driver, DRV_NAME, 32);
4517 strncpy(drvinfo->version, DRV_VERSION, 32);
4518 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4519}
4520
7282d491 4521static const struct ethtool_ops bond_ethtool_ops = {
217df670 4522 .get_drvinfo = bond_ethtool_get_drvinfo,
8531c5ff
AK		 4523};
4524
1da177e4
LT		 4525/*
4526 * Does not allocate but creates a /proc entry.
4527 * Allowed to fail.
4528 */
3c535952 4529static int bond_init(struct net_device *bond_dev, struct bond_params *params)
1da177e4
LT		 4530{
4531 struct bonding *bond = bond_dev->priv;
4532
4533 dprintk("Begin bond_init for %s\n", bond_dev->name);
4534
4535 /* initialize rwlocks */
4536 rwlock_init(&bond->lock);
4537 rwlock_init(&bond->curr_slave_lock);
4538
4539 bond->params = *params; /* copy params struct */
4540
1b76b316
JV		 4541 bond->wq = create_singlethread_workqueue(bond_dev->name);
4542 if (!bond->wq)
4543 return -ENOMEM;
4544
1da177e4
LT		 4545 /* Initialize pointers */
4546 bond->first_slave = NULL;
4547 bond->curr_active_slave = NULL;
4548 bond->current_arp_slave = NULL;
4549 bond->primary_slave = NULL;
4550 bond->dev = bond_dev;
1053f62c 4551 bond->send_grat_arp = 0;
d90a162a 4552 bond->setup_by_slave = 0;
1da177e4
LT		 4553 INIT_LIST_HEAD(&bond->vlan_list);
4554
4555 /* Initialize the device entry points */
4556 bond_dev->open = bond_open;
4557 bond_dev->stop = bond_close;
4558 bond_dev->get_stats = bond_get_stats;
4559 bond_dev->do_ioctl = bond_do_ioctl;
8531c5ff 4560 bond_dev->ethtool_ops = &bond_ethtool_ops;
1da177e4
LT		 4561 bond_dev->set_multicast_list = bond_set_multicast_list;
4562 bond_dev->change_mtu = bond_change_mtu;
4563 bond_dev->set_mac_address = bond_set_mac_address;
3a1521b7 4564 bond_dev->validate_addr = NULL;
1da177e4 4565
169a3e66 4566 bond_set_mode_ops(bond, bond->params.mode);
1da177e4
LT		 4567
4568 bond_dev->destructor = free_netdev;
4569
4570 /* Initialize the device options */
4571 bond_dev->tx_queue_len = 0;
4572 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
0b680e75 4573 bond_dev->priv_flags |= IFF_BONDING;
1da177e4
LT		 4574
4575 /* At first, we block adding VLANs. That's the only way to
4576 * prevent problems that occur when adding VLANs over an
4577 * empty bond. The block will be removed once non-challenged
4578 * slaves are enslaved.
4579 */
4580 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4581
932ff279 4582 /* don't acquire bond device's netif_tx_lock when
1da177e4
LT		 4583 * transmitting */
4584 bond_dev->features |= NETIF_F_LLTX;
4585
4586 /* By default, we declare the bond to be fully
4587 * VLAN hardware accelerated capable. Special
4588 * care is taken in the various xmit functions
4589 * when there are slaves that are not hw accel
4590 * capable
4591 */
4592 bond_dev->vlan_rx_register = bond_vlan_rx_register;
4593 bond_dev->vlan_rx_add_vid = bond_vlan_rx_add_vid;
4594 bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4595 bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4596 NETIF_F_HW_VLAN_RX |
4597 NETIF_F_HW_VLAN_FILTER);
4598
4599#ifdef CONFIG_PROC_FS
4600 bond_create_proc_entry(bond);
4601#endif
1da177e4
LT		 4602 list_add_tail(&bond->bond_list, &bond_dev_list);
4603
4604 return 0;
4605}
4606
4607/* De-initialize device specific data.
4608 * Caller must hold rtnl_lock.
4609 */
c50b85d0 4610static void bond_deinit(struct net_device *bond_dev)
1da177e4
LT		 4611{
4612 struct bonding *bond = bond_dev->priv;
4613
4614 list_del(&bond->bond_list);
4615
4616#ifdef CONFIG_PROC_FS
4617 bond_remove_proc_entry(bond);
4618#endif
4619}
4620
fdaea7a9
JV		 4621static void bond_work_cancel_all(struct bonding *bond)
4622{
4623 write_lock_bh(&bond->lock);
4624 bond->kill_timers = 1;
4625 write_unlock_bh(&bond->lock);
4626
4627 if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4628 cancel_delayed_work(&bond->mii_work);
4629
4630 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4631 cancel_delayed_work(&bond->arp_work);
4632
4633 if (bond->params.mode == BOND_MODE_ALB &&
4634 delayed_work_pending(&bond->alb_work))
4635 cancel_delayed_work(&bond->alb_work);
4636
4637 if (bond->params.mode == BOND_MODE_8023AD &&
4638 delayed_work_pending(&bond->ad_work))
4639 cancel_delayed_work(&bond->ad_work);
4640}
4641
1da177e4
LT		 4642/* Unregister and free all bond devices.
4643 * Caller must hold rtnl_lock.
4644 */
4645static void bond_free_all(void)
4646{
4647 struct bonding *bond, *nxt;
4648
4649 list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4650 struct net_device *bond_dev = bond->dev;
4651
fdaea7a9 4652 bond_work_cancel_all(bond);
80ee5ad2 4653 netif_tx_lock_bh(bond_dev);
70298705 4654 bond_mc_list_destroy(bond);
80ee5ad2 4655 netif_tx_unlock_bh(bond_dev);
70298705 4656 /* Release the bonded slaves */
4657 bond_release_all(bond_dev);
92b41daa 4658 bond_destroy(bond);
1da177e4
LT		 4659 }
4660
4661#ifdef CONFIG_PROC_FS
4662 bond_destroy_proc_dir();
4663#endif
4664}
4665
4666/*------------------------- Module initialization ---------------------------*/
4667
4668/*
4669 * Convert string input module parms. Accept either the
ece95f7f
JV		 4670 * number of the mode or its string name. A bit complicated because
4671 * some mode names are substrings of other names, and calls from sysfs
4672 * may have whitespace in the name (trailing newlines, for example).
1da177e4 4673 */
ece95f7f 4674int bond_parse_parm(const char *buf, struct bond_parm_tbl *tbl)
1da177e4 4675{
ece95f7f 4676 int mode = -1, i, rv;
a42e534f 4677 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
ece95f7f 4678
a42e534f
JV		 4679 for (p = (char *)buf; *p; p++)
4680 if (!(isdigit(*p) || isspace(*p)))
4681 break;
4682
4683 if (*p)
ece95f7f 4684 rv = sscanf(buf, "%20s", modestr);
a42e534f
JV		 4685 else
4686 rv = sscanf(buf, "%d", &mode);
4687
4688 if (!rv)
4689 return -1;
1da177e4
LT		 4690
4691 for (i = 0; tbl[i].modename; i++) {
ece95f7f
JV		 4692 if (mode == tbl[i].mode)
4693 return tbl[i].mode;
4694 if (strcmp(modestr, tbl[i].modename) == 0)
1da177e4 4695 return tbl[i].mode;
1da177e4
LT		 4696 }
4697
4698 return -1;
4699}
4700
4701static int bond_check_params(struct bond_params *params)
4702{
3915c1e8 4703 int arp_validate_value, fail_over_mac_value;
f5b2b966 4704
1da177e4
LT		 4705 /*
4706 * Convert string parameters.
4707 */
4708 if (mode) {
4709 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4710 if (bond_mode == -1) {
4711 printk(KERN_ERR DRV_NAME
4712 ": Error: Invalid bonding mode \"%s\"\n",
4713 mode == NULL ? "NULL" : mode);
4714 return -EINVAL;
4715 }
4716 }
4717
169a3e66
JV		 4718 if (xmit_hash_policy) {
4719 if ((bond_mode != BOND_MODE_XOR) &&
4720 (bond_mode != BOND_MODE_8023AD)) {
4721 printk(KERN_INFO DRV_NAME
4722 ": xor_mode param is irrelevant in mode %s\n",
4723 bond_mode_name(bond_mode));
4724 } else {
4725 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4726 xmit_hashtype_tbl);
4727 if (xmit_hashtype == -1) {
4728 printk(KERN_ERR DRV_NAME
4729 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4730 xmit_hash_policy == NULL ? "NULL" :
4731 xmit_hash_policy);
4732 return -EINVAL;
4733 }
4734 }
4735 }
4736
1da177e4
LT		 4737 if (lacp_rate) {
4738 if (bond_mode != BOND_MODE_8023AD) {
4739 printk(KERN_INFO DRV_NAME
4740 ": lacp_rate param is irrelevant in mode %s\n",
4741 bond_mode_name(bond_mode));
4742 } else {
4743 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4744 if (lacp_fast == -1) {
4745 printk(KERN_ERR DRV_NAME
4746 ": Error: Invalid lacp rate \"%s\"\n",
4747 lacp_rate == NULL ? "NULL" : lacp_rate);
4748 return -EINVAL;
4749 }
4750 }
4751 }
4752
4753 if (max_bonds < 1 || max_bonds > INT_MAX) {
4754 printk(KERN_WARNING DRV_NAME
4755 ": Warning: max_bonds (%d) not in range %d-%d, so it "
4e0952c7 4756 "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
1da177e4
LT		 4757 max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4758 max_bonds = BOND_DEFAULT_MAX_BONDS;
4759 }
4760
4761 if (miimon < 0) {
4762 printk(KERN_WARNING DRV_NAME
4763 ": Warning: miimon module parameter (%d), "
4764 "not in range 0-%d, so it was reset to %d\n",
4765 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4766 miimon = BOND_LINK_MON_INTERV;
4767 }
4768
4769 if (updelay < 0) {
4770 printk(KERN_WARNING DRV_NAME
4771 ": Warning: updelay module parameter (%d), "
4772 "not in range 0-%d, so it was reset to 0\n",
4773 updelay, INT_MAX);
4774 updelay = 0;
4775 }
4776
4777 if (downdelay < 0) {
4778 printk(KERN_WARNING DRV_NAME
4779 ": Warning: downdelay module parameter (%d), "
4780 "not in range 0-%d, so it was reset to 0\n",
4781 downdelay, INT_MAX);
4782 downdelay = 0;
4783 }
4784
4785 if ((use_carrier != 0) && (use_carrier != 1)) {
4786 printk(KERN_WARNING DRV_NAME
4787 ": Warning: use_carrier module parameter (%d), "
4788 "not of valid value (0/1), so it was set to 1\n",
4789 use_carrier);
4790 use_carrier = 1;
4791 }
4792
7893b249
MS		 4793 if (num_grat_arp < 0 || num_grat_arp > 255) {
4794 printk(KERN_WARNING DRV_NAME
4795 ": Warning: num_grat_arp (%d) not in range 0-255 so it "
4796 "was reset to 1 \n", num_grat_arp);
4797 num_grat_arp = 1;
4798 }
4799
1da177e4
LT		 4800 /* reset values for 802.3ad */
4801 if (bond_mode == BOND_MODE_8023AD) {
4802 if (!miimon) {
4803 printk(KERN_WARNING DRV_NAME
4804 ": Warning: miimon must be specified, "
4805 "otherwise bonding will not detect link "
4806 "failure, speed and duplex which are "
4807 "essential for 802.3ad operation\n");
4808 printk(KERN_WARNING "Forcing miimon to 100msec\n");
4809 miimon = 100;
4810 }
4811 }
4812
4813 /* reset values for TLB/ALB */
4814 if ((bond_mode == BOND_MODE_TLB) ||
4815 (bond_mode == BOND_MODE_ALB)) {
4816 if (!miimon) {
4817 printk(KERN_WARNING DRV_NAME
4818 ": Warning: miimon must be specified, "
4819 "otherwise bonding will not detect link "
4820 "failure and link speed which are essential "
4821 "for TLB/ALB load balancing\n");
4822 printk(KERN_WARNING "Forcing miimon to 100msec\n");
4823 miimon = 100;
4824 }
4825 }
4826
4827 if (bond_mode == BOND_MODE_ALB) {
4828 printk(KERN_NOTICE DRV_NAME
4829 ": In ALB mode you might experience client "
4830 "disconnections upon reconnection of a link if the "
4831 "bonding module updelay parameter (%d msec) is "
4832 "incompatible with the forwarding delay time of the "
4833 "switch\n",
4834 updelay);
4835 }
4836
4837 if (!miimon) {
4838 if (updelay || downdelay) {
4839 /* just warn the user the up/down delay will have
4840 * no effect since miimon is zero...
4841 */
4842 printk(KERN_WARNING DRV_NAME
4843 ": Warning: miimon module parameter not set "
4844 "and updelay (%d) or downdelay (%d) module "
4845 "parameter is set; updelay and downdelay have "
4846 "no effect unless miimon is set\n",
4847 updelay, downdelay);
4848 }
4849 } else {
4850 /* don't allow arp monitoring */
4851 if (arp_interval) {
4852 printk(KERN_WARNING DRV_NAME
4853 ": Warning: miimon (%d) and arp_interval (%d) "
4854 "can't be used simultaneously, disabling ARP "
4855 "monitoring\n",
4856 miimon, arp_interval);
4857 arp_interval = 0;
4858 }
4859
4860 if ((updelay % miimon) != 0) {
4861 printk(KERN_WARNING DRV_NAME
4862 ": Warning: updelay (%d) is not a multiple "
4863 "of miimon (%d), updelay rounded to %d ms\n",
4864 updelay, miimon, (updelay / miimon) * miimon);
4865 }
4866
4867 updelay /= miimon;
4868
4869 if ((downdelay % miimon) != 0) {
4870 printk(KERN_WARNING DRV_NAME
4871 ": Warning: downdelay (%d) is not a multiple "
4872 "of miimon (%d), downdelay rounded to %d ms\n",
4873 downdelay, miimon,
4874 (downdelay / miimon) * miimon);
4875 }
4876
4877 downdelay /= miimon;
4878 }
4879
4880 if (arp_interval < 0) {
4881 printk(KERN_WARNING DRV_NAME
4882 ": Warning: arp_interval module parameter (%d) "
4883 ", not in range 0-%d, so it was reset to %d\n",
4884 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4885 arp_interval = BOND_LINK_ARP_INTERV;
4886 }
4887
4888 for (arp_ip_count = 0;
4889 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4890 arp_ip_count++) {
4891 /* not complete check, but should be good enough to
4892 catch mistakes */
4893 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4894 printk(KERN_WARNING DRV_NAME
4895 ": Warning: bad arp_ip_target module parameter "
4896 "(%s), ARP monitoring will not be performed\n",
4897 arp_ip_target[arp_ip_count]);
4898 arp_interval = 0;
4899 } else {
d3bb52b0 4900 __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
1da177e4
LT		 4901 arp_target[arp_ip_count] = ip;
4902 }
4903 }
4904
4905 if (arp_interval && !arp_ip_count) {
4906 /* don't allow arping if no arp_ip_target given... */
4907 printk(KERN_WARNING DRV_NAME
4908 ": Warning: arp_interval module parameter (%d) "
4909 "specified without providing an arp_ip_target "
4910 "parameter, arp_interval was reset to 0\n",
4911 arp_interval);
4912 arp_interval = 0;
4913 }
4914
f5b2b966
JV		 4915 if (arp_validate) {
4916 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4917 printk(KERN_ERR DRV_NAME
4918 ": arp_validate only supported in active-backup mode\n");
4919 return -EINVAL;
4920 }
4921 if (!arp_interval) {
4922 printk(KERN_ERR DRV_NAME
4923 ": arp_validate requires arp_interval\n");
4924 return -EINVAL;
4925 }
4926
4927 arp_validate_value = bond_parse_parm(arp_validate,
4928 arp_validate_tbl);
4929 if (arp_validate_value == -1) {
4930 printk(KERN_ERR DRV_NAME
4931 ": Error: invalid arp_validate \"%s\"\n",
4932 arp_validate == NULL ? "NULL" : arp_validate);
4933 return -EINVAL;
4934 }
4935 } else
4936 arp_validate_value = 0;
4937
1da177e4
LT		 4938 if (miimon) {
4939 printk(KERN_INFO DRV_NAME
4940 ": MII link monitoring set to %d ms\n",
4941 miimon);
4942 } else if (arp_interval) {
4943 int i;
4944
4945 printk(KERN_INFO DRV_NAME
f5b2b966
JV		 4946 ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4947 arp_interval,
4948 arp_validate_tbl[arp_validate_value].modename,
4949 arp_ip_count);
1da177e4
LT		 4950
4951 for (i = 0; i < arp_ip_count; i++)
4952 printk (" %s", arp_ip_target[i]);
4953
4954 printk("\n");
4955
4956 } else {
4957 /* miimon and arp_interval not set, we need one so things
4958 * work as expected, see bonding.txt for details
4959 */
4960 printk(KERN_WARNING DRV_NAME
4961 ": Warning: either miimon or arp_interval and "
4962 "arp_ip_target module parameters must be specified, "
4963 "otherwise bonding will not detect link failures! see "
4964 "bonding.txt for details.\n");
4965 }
4966
4967 if (primary && !USES_PRIMARY(bond_mode)) {
4968 /* currently, using a primary only makes sense
4969 * in active backup, TLB or ALB modes
4970 */
4971 printk(KERN_WARNING DRV_NAME
4972 ": Warning: %s primary device specified but has no "
4973 "effect in %s mode\n",
4974 primary, bond_mode_name(bond_mode));
4975 primary = NULL;
4976 }
4977
3915c1e8
JV		 4978 if (fail_over_mac) {
4979 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4980 fail_over_mac_tbl);
4981 if (fail_over_mac_value == -1) {
4982 printk(KERN_ERR DRV_NAME
4983 ": Error: invalid fail_over_mac \"%s\"\n",
4984 arp_validate == NULL ? "NULL" : arp_validate);
4985 return -EINVAL;
4986 }
4987
4988 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4989 printk(KERN_WARNING DRV_NAME
4990 ": Warning: fail_over_mac only affects "
4991 "active-backup mode.\n");
4992 } else {
4993 fail_over_mac_value = BOND_FOM_NONE;
4994 }
dd957c57 4995
1da177e4
LT		 4996 /* fill params struct with the proper values */
4997 params->mode = bond_mode;
169a3e66 4998 params->xmit_policy = xmit_hashtype;
1da177e4 4999 params->miimon = miimon;
7893b249 5000 params->num_grat_arp = num_grat_arp;
1da177e4 5001 params->arp_interval = arp_interval;
f5b2b966 5002 params->arp_validate = arp_validate_value;
1da177e4
LT		 5003 params->updelay = updelay;
5004 params->downdelay = downdelay;
5005 params->use_carrier = use_carrier;
5006 params->lacp_fast = lacp_fast;
5007 params->primary[0] = 0;
3915c1e8 5008 params->fail_over_mac = fail_over_mac_value;
1da177e4
LT		 5009
5010 if (primary) {
5011 strncpy(params->primary, primary, IFNAMSIZ);
5012 params->primary[IFNAMSIZ - 1] = 0;
5013 }
5014
5015 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5016
5017 return 0;
5018}
5019
0daa2303
PZ		 5020static struct lock_class_key bonding_netdev_xmit_lock_key;
5021
dfe60397 5022/* Create a new bond based on the specified name and bonding parameters.
e4b91c48 5023 * If name is NULL, obtain a suitable "bond%d" name for us.
dfe60397
MW		 5024 * Caller must NOT hold rtnl_lock; we need to release it here before we
5025 * set up our sysfs entries.
5026 */
0dd646fe 5027int bond_create(char *name, struct bond_params *params)
dfe60397
MW		 5028{
5029 struct net_device *bond_dev;
0883beca 5030 struct bonding *bond;
dfe60397
MW		 5031 int res;
5032
5033 rtnl_lock();
027ea041
JV		 5034 down_write(&bonding_rwsem);
5035
5036 /* Check to see if the bond already exists. */
4fe4763c 5037 if (name) {
0883beca 5038 list_for_each_entry(bond, &bond_dev_list, bond_list)
4fe4763c
JV		 5039 if (strnicmp(bond->dev->name, name, IFNAMSIZ) == 0) {
5040 printk(KERN_ERR DRV_NAME
027ea041 5041 ": cannot add bond %s; it already exists\n",
4fe4763c
JV		 5042 name);
5043 res = -EPERM;
5044 goto out_rtnl;
5045 }
5046 }
027ea041 5047
e4b91c48
JV		 5048 bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
5049 ether_setup);
dfe60397
MW		 5050 if (!bond_dev) {
5051 printk(KERN_ERR DRV_NAME
5052 ": %s: eek! can't alloc netdev!\n",
5053 name);
5054 res = -ENOMEM;
5055 goto out_rtnl;
5056 }
5057
e4b91c48
JV		 5058 if (!name) {
5059 res = dev_alloc_name(bond_dev, "bond%d");
5060 if (res < 0)
5061 goto out_netdev;
5062 }
5063
dfe60397
MW		 5064 /* bond_init() must be called after dev_alloc_name() (for the
5065 * /proc files), but before register_netdevice(), because we
5066 * need to set function pointers.
5067 */
5068
5069 res = bond_init(bond_dev, params);
5070 if (res < 0) {
5071 goto out_netdev;
5072 }
5073
dfe60397
MW		 5074 res = register_netdevice(bond_dev);
5075 if (res < 0) {
5076 goto out_bond;
5077 }
0daa2303
PZ		 5078
5079 lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
5080
ff59c456
JV		 5081 netif_carrier_off(bond_dev);
5082
027ea041 5083 up_write(&bonding_rwsem);
dfe60397 5084 rtnl_unlock(); /* allows sysfs registration of net device */
b76cdba9 5085 res = bond_create_sysfs_entry(bond_dev->priv);
09c89279
JV		 5086 if (res < 0) {
5087 rtnl_lock();
027ea041 5088 down_write(&bonding_rwsem);
822973ba
PE		 5089 bond_deinit(bond_dev);
5090 unregister_netdevice(bond_dev);
5091 goto out_rtnl;
09c89279
JV		 5092 }
5093
5094 return 0;
5095
dfe60397
MW		 5096out_bond:
5097 bond_deinit(bond_dev);
5098out_netdev:
5099 free_netdev(bond_dev);
5100out_rtnl:
027ea041 5101 up_write(&bonding_rwsem);
dfe60397 5102 rtnl_unlock();
dfe60397
MW		 5103 return res;
5104}
5105
1da177e4
LT		 5106static int __init bonding_init(void)
5107{
1da177e4
LT		 5108 int i;
5109 int res;
0883beca 5110 struct bonding *bond;
1da177e4
LT		 5111
5112 printk(KERN_INFO "%s", version);
5113
dfe60397 5114 res = bond_check_params(&bonding_defaults);
1da177e4 5115 if (res) {
dfe60397 5116 goto out;
1da177e4
LT		 5117 }
5118
1da177e4
LT		 5119#ifdef CONFIG_PROC_FS
5120 bond_create_proc_dir();
5121#endif
027ea041
JV		 5122
5123 init_rwsem(&bonding_rwsem);
5124
1da177e4 5125 for (i = 0; i < max_bonds; i++) {
0dd646fe 5126 res = bond_create(NULL, &bonding_defaults);
dfe60397
MW		 5127 if (res)
5128 goto err;
1da177e4
LT		 5129 }
5130
b76cdba9
MW		 5131 res = bond_create_sysfs();
5132 if (res)
5133 goto err;
5134
1da177e4 5135 register_netdevice_notifier(&bond_netdev_notifier);
c3ade5ca 5136 register_inetaddr_notifier(&bond_inetaddr_notifier);
1da177e4 5137
dfe60397
MW		 5138 goto out;
5139err:
0883beca 5140 list_for_each_entry(bond, &bond_dev_list, bond_list) {
1b76b316
JV		 5141 bond_work_cancel_all(bond);
5142 destroy_workqueue(bond->wq);
5143 }
5144
ae68c398
PE		 5145 bond_destroy_sysfs();
5146
40abc270 5147 rtnl_lock();
1da177e4 5148 bond_free_all();
1da177e4 5149 rtnl_unlock();
dfe60397 5150out:
1da177e4 5151 return res;
dfe60397 5152
1da177e4
LT		 5153}
5154
5155static void __exit bonding_exit(void)
5156{
5157 unregister_netdevice_notifier(&bond_netdev_notifier);
c3ade5ca 5158 unregister_inetaddr_notifier(&bond_inetaddr_notifier);
1da177e4 5159
ae68c398
PE		 5160 bond_destroy_sysfs();
5161
1da177e4
LT		 5162 rtnl_lock();
5163 bond_free_all();
5164 rtnl_unlock();
5165}
5166
5167module_init(bonding_init);
5168module_exit(bonding_exit);
5169MODULE_LICENSE("GPL");
5170MODULE_VERSION(DRV_VERSION);
5171MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5172MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5173MODULE_SUPPORTED_DEVICE("most ethernet devices");
5174
5175/*
5176 * Local variables:
5177 * c-indent-level: 8
5178 * c-basic-offset: 8
5179 * tab-width: 8
5180 * End:
5181 */
5182
Clone of davem's net-next-2.6 tree