bond_main.c 136 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
/*
 * originally based on the dummy device.
 *
 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
 *
 * bonding.c: an Ethernet Bonding driver
 *
 * This is useful to talk to a Cisco EtherChannel compatible equipment:
 *	Cisco 5500
 *	Sun Trunking (Solaris)
 *	Alteon AceDirector Trunks
 *	Linux Bonding
 *	and probably many L2 switches ...
 *
 * How it works:
 *    ifconfig bond0 ipaddress netmask up
 *      will setup a network device, with an ip address.  No mac address
 *	will be assigned at this time.  The hw mac address will come from
 *	the first slave bonded to the channel.  All slaves will then use
 *	this hw mac address.
 *
 *    ifconfig bond0 down
 *         will release all slaves, marking them as down.
 *
 *    ifenslave bond0 eth0
 *	will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
 *	a: be used as initial mac address
 *	b: if a hw mac address already is there, eth0's hw mac address
 *	   will then be set from bond0.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
42
#include <net/ip.h>
Linus Torvalds's avatar
Linus Torvalds committed
43
#include <linux/ip.h>
44
45
#include <linux/tcp.h>
#include <linux/udp.h>
Linus Torvalds's avatar
Linus Torvalds committed
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/socket.h>
#include <linux/ctype.h>
#include <linux/inet.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
61
#include <linux/igmp.h>
Linus Torvalds's avatar
Linus Torvalds committed
62
63
64
65
66
67
68
69
70
71
72
73
74
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/rtnetlink.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/smp.h>
#include <linux/if_ether.h>
#include <net/arp.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/if_bonding.h>
David Sterba's avatar
David Sterba committed
75
#include <linux/jiffies.h>
Jay Vosburgh's avatar
Jay Vosburgh committed
76
#include <net/route.h>
77
#include <net/net_namespace.h>
Linus Torvalds's avatar
Linus Torvalds committed
78
79
80
81
82
83
84
85
86
87
88
#include "bonding.h"
#include "bond_3ad.h"
#include "bond_alb.h"

/*---------------------------- Module parameters ----------------------------*/

/* monitor all links that often (in milliseconds). <=0 disables monitoring */
#define BOND_LINK_MON_INTERV	0
#define BOND_LINK_ARP_INTERV	0

static int max_bonds	= BOND_DEFAULT_MAX_BONDS;
89
static int num_grat_arp = 1;
90
static int num_unsol_na = 1;
Linus Torvalds's avatar
Linus Torvalds committed
91
92
93
94
95
96
97
static int miimon	= BOND_LINK_MON_INTERV;
static int updelay	= 0;
static int downdelay	= 0;
static int use_carrier	= 1;
static char *mode	= NULL;
static char *primary	= NULL;
static char *lacp_rate	= NULL;
98
static char *ad_select  = NULL;
99
static char *xmit_hash_policy = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
100
101
static int arp_interval = BOND_LINK_ARP_INTERV;
static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
102
static char *arp_validate = NULL;
103
static char *fail_over_mac = NULL;
104
struct bond_params bonding_defaults;
Linus Torvalds's avatar
Linus Torvalds committed
105
106
107

module_param(max_bonds, int, 0);
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
108
109
module_param(num_grat_arp, int, 0644);
MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
110
111
module_param(num_unsol_na, int, 0644);
MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
Linus Torvalds's avatar
Linus Torvalds committed
112
113
114
115
116
module_param(miimon, int, 0);
MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
module_param(updelay, int, 0);
MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
module_param(downdelay, int, 0);
117
118
MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
			    "in milliseconds");
Linus Torvalds's avatar
Linus Torvalds committed
119
module_param(use_carrier, int, 0);
120
121
MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
			      "0 for off, 1 for on (default)");
Linus Torvalds's avatar
Linus Torvalds committed
122
module_param(mode, charp, 0);
123
124
125
126
MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
		       "1 for active-backup, 2 for balance-xor, "
		       "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
		       "6 for balance-alb");
Linus Torvalds's avatar
Linus Torvalds committed
127
128
129
module_param(primary, charp, 0);
MODULE_PARM_DESC(primary, "Primary network device to use");
module_param(lacp_rate, charp, 0);
130
131
MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
			    "(slow/fast)");
132
133
module_param(ad_select, charp, 0);
MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
134
module_param(xmit_hash_policy, charp, 0);
135
136
MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
				   ", 1 for layer 3+4");
Linus Torvalds's avatar
Linus Torvalds committed
137
138
139
140
module_param(arp_interval, int, 0);
MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
module_param_array(arp_ip_target, charp, NULL, 0);
MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
141
142
module_param(arp_validate, charp, 0);
MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
143
144
module_param(fail_over_mac, charp, 0);
MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
Linus Torvalds's avatar
Linus Torvalds committed
145
146
147

/*----------------------------- Global variables ----------------------------*/

148
static const char * const version =
Linus Torvalds's avatar
Linus Torvalds committed
149
150
	DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";

151
LIST_HEAD(bond_dev_list);
Linus Torvalds's avatar
Linus Torvalds committed
152
153
154
155
156

#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *bond_proc_dir = NULL;
#endif

157
static __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
Linus Torvalds's avatar
Linus Torvalds committed
158
159
static int arp_ip_count	= 0;
static int bond_mode	= BOND_MODE_ROUNDROBIN;
160
static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
Linus Torvalds's avatar
Linus Torvalds committed
161
static int lacp_fast	= 0;
162

Linus Torvalds's avatar
Linus Torvalds committed
163

164
const struct bond_parm_tbl bond_lacp_tbl[] = {
Linus Torvalds's avatar
Linus Torvalds committed
165
166
167
168
169
{	"slow",		AD_LACP_SLOW},
{	"fast",		AD_LACP_FAST},
{	NULL,		-1},
};

170
const struct bond_parm_tbl bond_mode_tbl[] = {
Linus Torvalds's avatar
Linus Torvalds committed
171
172
173
174
175
176
177
178
179
180
{	"balance-rr",		BOND_MODE_ROUNDROBIN},
{	"active-backup",	BOND_MODE_ACTIVEBACKUP},
{	"balance-xor",		BOND_MODE_XOR},
{	"broadcast",		BOND_MODE_BROADCAST},
{	"802.3ad",		BOND_MODE_8023AD},
{	"balance-tlb",		BOND_MODE_TLB},
{	"balance-alb",		BOND_MODE_ALB},
{	NULL,			-1},
};

181
const struct bond_parm_tbl xmit_hashtype_tbl[] = {
182
183
{	"layer2",		BOND_XMIT_POLICY_LAYER2},
{	"layer3+4",		BOND_XMIT_POLICY_LAYER34},
184
{	"layer2+3",		BOND_XMIT_POLICY_LAYER23},
185
186
187
{	NULL,			-1},
};

188
const struct bond_parm_tbl arp_validate_tbl[] = {
189
190
191
192
193
194
195
{	"none",			BOND_ARP_VALIDATE_NONE},
{	"active",		BOND_ARP_VALIDATE_ACTIVE},
{	"backup",		BOND_ARP_VALIDATE_BACKUP},
{	"all",			BOND_ARP_VALIDATE_ALL},
{	NULL,			-1},
};

196
const struct bond_parm_tbl fail_over_mac_tbl[] = {
197
198
199
200
201
202
{	"none",			BOND_FOM_NONE},
{	"active",		BOND_FOM_ACTIVE},
{	"follow",		BOND_FOM_FOLLOW},
{	NULL,			-1},
};

203
204
205
206
207
208
209
struct bond_parm_tbl ad_select_tbl[] = {
{	"stable",	BOND_AD_STABLE},
{	"bandwidth",	BOND_AD_BANDWIDTH},
{	"count",	BOND_AD_COUNT},
{	NULL,		-1},
};

Linus Torvalds's avatar
Linus Torvalds committed
210
211
/*-------------------------- Forward declarations ---------------------------*/

Jay Vosburgh's avatar
Jay Vosburgh committed
212
static void bond_send_gratuitous_arp(struct bonding *bond);
213
static void bond_deinit(struct net_device *bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
214
215
216

/*---------------------------- General routines -----------------------------*/

217
static const char *bond_mode_name(int mode)
Linus Torvalds's avatar
Linus Torvalds committed
218
{
219
220
221
222
223
224
225
226
227
228
229
	static const char *names[] = {
		[BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
		[BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
		[BOND_MODE_XOR] = "load balancing (xor)",
		[BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
		[BOND_MODE_8023AD]= "IEEE 802.3ad Dynamic link aggregation",
		[BOND_MODE_TLB] = "transmit load balancing",
		[BOND_MODE_ALB] = "adaptive load balancing",
	};

	if (mode < 0 || mode > BOND_MODE_ALB)
Linus Torvalds's avatar
Linus Torvalds committed
230
		return "unknown";
231
232

	return names[mode];
Linus Torvalds's avatar
Linus Torvalds committed
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
}

/*---------------------------------- VLAN -----------------------------------*/

/**
 * bond_add_vlan - add a new vlan id on bond
 * @bond: bond that got the notification
 * @vlan_id: the vlan id to add
 *
 * Returns -ENOMEM if allocation failed.
 */
static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
{
	struct vlan_entry *vlan;

248
	pr_debug("bond: %s, vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
249
250
		(bond ? bond->dev->name: "None"), vlan_id);

251
	vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
252
253
254
255
256
257
258
259
260
261
262
263
264
	if (!vlan) {
		return -ENOMEM;
	}

	INIT_LIST_HEAD(&vlan->vlan_list);
	vlan->vlan_id = vlan_id;

	write_lock_bh(&bond->lock);

	list_add_tail(&vlan->vlan_list, &bond->vlan_list);

	write_unlock_bh(&bond->lock);

265
	pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
266
267
268
269
270
271
272
273
274
275
276
277
278

	return 0;
}

/**
 * bond_del_vlan - delete a vlan id from bond
 * @bond: bond that got the notification
 * @vlan_id: the vlan id to delete
 *
 * returns -ENODEV if @vlan_id was not found in @bond.
 */
static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
{
279
	struct vlan_entry *vlan;
Linus Torvalds's avatar
Linus Torvalds committed
280
281
	int res = -ENODEV;

282
	pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
283
284
285

	write_lock_bh(&bond->lock);

286
	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
Linus Torvalds's avatar
Linus Torvalds committed
287
288
289
		if (vlan->vlan_id == vlan_id) {
			list_del(&vlan->vlan_list);

290
			if (bond_is_lb(bond))
Linus Torvalds's avatar
Linus Torvalds committed
291
292
				bond_alb_clear_vlan(bond, vlan_id);

293
			pr_debug("removed VLAN ID %d from bond %s\n", vlan_id,
Linus Torvalds's avatar
Linus Torvalds committed
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
				bond->dev->name);

			kfree(vlan);

			if (list_empty(&bond->vlan_list) &&
			    (bond->slave_cnt == 0)) {
				/* Last VLAN removed and no slaves, so
				 * restore block on adding VLANs. This will
				 * be removed once new slaves that are not
				 * VLAN challenged will be added.
				 */
				bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
			}

			res = 0;
			goto out;
		}
	}

313
	pr_debug("couldn't find VLAN ID %d in bond %s\n", vlan_id,
Linus Torvalds's avatar
Linus Torvalds committed
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
		bond->dev->name);

out:
	write_unlock_bh(&bond->lock);
	return res;
}

/**
 * bond_has_challenged_slaves
 * @bond: the bond we're working on
 *
 * Searches the slave list. Returns 1 if a vlan challenged slave
 * was found, 0 otherwise.
 *
 * Assumes bond->lock is held.
 */
static int bond_has_challenged_slaves(struct bonding *bond)
{
	struct slave *slave;
	int i;

	bond_for_each_slave(bond, slave, i) {
		if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
337
			pr_debug("found VLAN challenged slave - %s\n",
Linus Torvalds's avatar
Linus Torvalds committed
338
339
340
341
342
				slave->dev->name);
			return 1;
		}
	}

343
	pr_debug("no VLAN challenged slaves found\n");
Linus Torvalds's avatar
Linus Torvalds committed
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
	return 0;
}

/**
 * bond_next_vlan - safely skip to the next item in the vlans list.
 * @bond: the bond we're working on
 * @curr: item we're advancing from
 *
 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 * or @curr->next otherwise (even if it is @curr itself again).
 * 
 * Caller must hold bond->lock
 */
struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
{
	struct vlan_entry *next, *last;

	if (list_empty(&bond->vlan_list)) {
		return NULL;
	}

	if (!curr) {
		next = list_entry(bond->vlan_list.next,
				  struct vlan_entry, vlan_list);
	} else {
		last = list_entry(bond->vlan_list.prev,
				  struct vlan_entry, vlan_list);
		if (last == curr) {
			next = list_entry(bond->vlan_list.next,
					  struct vlan_entry, vlan_list);
		} else {
			next = list_entry(curr->vlan_list.next,
					  struct vlan_entry, vlan_list);
		}
	}

	return next;
}

/**
 * bond_dev_queue_xmit - Prepare skb for xmit.
 * 
 * @bond: bond device that got this skb for tx.
 * @skb: hw accel VLAN tagged skb to transmit
 * @slave_dev: slave that is supposed to xmit this skbuff
 * 
 * When the bond gets an skb to transmit that is
 * already hardware accelerated VLAN tagged, and it
 * needs to relay this skb to a slave that is not
 * hw accel capable, the skb needs to be "unaccelerated",
 * i.e. strip the hwaccel tag and re-insert it as part
 * of the payload.
 */
int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
{
399
	unsigned short uninitialized_var(vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447

	if (!list_empty(&bond->vlan_list) &&
	    !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
	    vlan_get_tag(skb, &vlan_id) == 0) {
		skb->dev = slave_dev;
		skb = vlan_put_tag(skb, vlan_id);
		if (!skb) {
			/* vlan_put_tag() frees the skb in case of error,
			 * so return success here so the calling functions
			 * won't attempt to free is again.
			 */
			return 0;
		}
	} else {
		skb->dev = slave_dev;
	}

	skb->priority = 1;
	dev_queue_xmit(skb);

	return 0;
}

/*
 * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
 * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
 * lock because:
 * a. This operation is performed in IOCTL context,
 * b. The operation is protected by the RTNL semaphore in the 8021q code,
 * c. Holding a lock with BH disabled while directly calling a base driver
 *    entry point is generally a BAD idea.
 * 
 * The design of synchronization/protection for this operation in the 8021q
 * module is good for one or more VLAN devices over a single physical device
 * and cannot be extended for a teaming solution like bonding, so there is a
 * potential race condition here where a net device from the vlan group might
 * be referenced (either by a base driver or the 8021q code) while it is being
 * removed from the system. However, it turns out we're not making matters
 * worse, and if it works for regular VLAN usage it will work here too.
*/

/**
 * bond_vlan_rx_register - Propagates registration to slaves
 * @bond_dev: bonding net device that got called
 * @grp: vlan group being registered
 */
static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
{
448
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
449
450
451
452
453
454
455
	struct slave *slave;
	int i;

	bond->vlgrp = grp;

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;
456
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
457
458

		if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
459
460
		    slave_ops->ndo_vlan_rx_register) {
			slave_ops->ndo_vlan_rx_register(slave_dev, grp);
Linus Torvalds's avatar
Linus Torvalds committed
461
462
463
464
465
466
467
468
469
470
471
		}
	}
}

/**
 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 * @bond_dev: bonding net device that got called
 * @vid: vlan id being added
 */
static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
{
472
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
473
474
475
476
477
	struct slave *slave;
	int i, res;

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;
478
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
479
480

		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
481
482
		    slave_ops->ndo_vlan_rx_add_vid) {
			slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
Linus Torvalds's avatar
Linus Torvalds committed
483
484
485
486
487
488
		}
	}

	res = bond_add_vlan(bond, vid);
	if (res) {
		printk(KERN_ERR DRV_NAME
489
		       ": %s: Error: Failed to add vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
490
491
492
493
494
495
496
497
498
499
500
		       bond_dev->name, vid);
	}
}

/**
 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 * @bond_dev: bonding net device that got called
 * @vid: vlan id being removed
 */
static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
{
501
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
502
503
504
505
506
507
	struct slave *slave;
	struct net_device *vlan_dev;
	int i, res;

	bond_for_each_slave(bond, slave, i) {
		struct net_device *slave_dev = slave->dev;
508
		const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
509
510

		if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
511
		    slave_ops->ndo_vlan_rx_kill_vid) {
Linus Torvalds's avatar
Linus Torvalds committed
512
513
514
			/* Save and then restore vlan_dev in the grp array,
			 * since the slave's driver might clear it.
			 */
515
			vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
516
			slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
517
			vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
Linus Torvalds's avatar
Linus Torvalds committed
518
519
520
521
522
523
		}
	}

	res = bond_del_vlan(bond, vid);
	if (res) {
		printk(KERN_ERR DRV_NAME
524
		       ": %s: Error: Failed to remove vlan id %d\n",
Linus Torvalds's avatar
Linus Torvalds committed
525
526
527
528
529
530
531
		       bond_dev->name, vid);
	}
}

static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
{
	struct vlan_entry *vlan;
532
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
533
534
535

	write_lock_bh(&bond->lock);

536
	if (list_empty(&bond->vlan_list))
Linus Torvalds's avatar
Linus Torvalds committed
537
538
539
		goto out;

	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
540
541
	    slave_ops->ndo_vlan_rx_register)
		slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
Linus Torvalds's avatar
Linus Torvalds committed
542
543

	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
544
	    !(slave_ops->ndo_vlan_rx_add_vid))
Linus Torvalds's avatar
Linus Torvalds committed
545
546
		goto out;

547
548
	list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
		slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
Linus Torvalds's avatar
Linus Torvalds committed
549
550
551
552
553
554
555

out:
	write_unlock_bh(&bond->lock);
}

static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
{
556
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
557
558
559
560
561
	struct vlan_entry *vlan;
	struct net_device *vlan_dev;

	write_lock_bh(&bond->lock);

562
	if (list_empty(&bond->vlan_list))
Linus Torvalds's avatar
Linus Torvalds committed
563
564
565
		goto out;

	if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
566
	    !(slave_ops->ndo_vlan_rx_kill_vid))
Linus Torvalds's avatar
Linus Torvalds committed
567
568
569
570
571
572
		goto unreg;

	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
		/* Save and then restore vlan_dev in the grp array,
		 * since the slave's driver might clear it.
		 */
573
		vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
574
		slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
575
		vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
Linus Torvalds's avatar
Linus Torvalds committed
576
577
578
579
	}

unreg:
	if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
580
581
	    slave_ops->ndo_vlan_rx_register)
		slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
582
583
584
585
586
587
588

out:
	write_unlock_bh(&bond->lock);
}

/*------------------------------- Link status -------------------------------*/

589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
/*
 * Set the carrier state for the master according to the state of its
 * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 * do special 802.3ad magic.
 *
 * Returns zero if carrier state does not change, nonzero if it does.
 */
static int bond_set_carrier(struct bonding *bond)
{
	struct slave *slave;
	int i;

	if (bond->slave_cnt == 0)
		goto down;

	if (bond->params.mode == BOND_MODE_8023AD)
		return bond_3ad_set_carrier(bond);

	bond_for_each_slave(bond, slave, i) {
		if (slave->link == BOND_LINK_UP) {
			if (!netif_carrier_ok(bond->dev)) {
				netif_carrier_on(bond->dev);
				return 1;
			}
			return 0;
		}
	}

down:
	if (netif_carrier_ok(bond->dev)) {
		netif_carrier_off(bond->dev);
		return 1;
	}
	return 0;
}

Linus Torvalds's avatar
Linus Torvalds committed
625
626
627
628
629
630
631
632
633
634
/*
 * Get link speed and duplex from the slave's base driver
 * using ethtool. If for some reason the call fails or the
 * values are invalid, fake speed and duplex to 100/Full
 * and return error.
 */
static int bond_update_speed_duplex(struct slave *slave)
{
	struct net_device *slave_dev = slave->dev;
	struct ethtool_cmd etool;
635
	int res;
Linus Torvalds's avatar
Linus Torvalds committed
636
637
638
639
640

	/* Fake speed and duplex */
	slave->speed = SPEED_100;
	slave->duplex = DUPLEX_FULL;

641
642
	if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
		return -1;
Linus Torvalds's avatar
Linus Torvalds committed
643

644
645
	res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
	if (res < 0)
Linus Torvalds's avatar
Linus Torvalds committed
646
647
648
649
650
651
		return -1;

	switch (etool.speed) {
	case SPEED_10:
	case SPEED_100:
	case SPEED_1000:
652
	case SPEED_10000:
Linus Torvalds's avatar
Linus Torvalds committed
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
		break;
	default:
		return -1;
	}

	switch (etool.duplex) {
	case DUPLEX_FULL:
	case DUPLEX_HALF:
		break;
	default:
		return -1;
	}

	slave->speed = etool.speed;
	slave->duplex = etool.duplex;

	return 0;
}

/*
 * if <dev> supports MII link status reporting, check its link status.
 *
 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 * depening upon the setting of the use_carrier parameter.
 *
 * Return either BMSR_LSTATUS, meaning that the link is up (or we
 * can't tell and just pretend it is), or 0, meaning that the link is
 * down.
 *
 * If reporting is non-zero, instead of faking link up, return -1 if
 * both ETHTOOL and MII ioctls fail (meaning the device does not
 * support them).  If use_carrier is set, return whatever it says.
 * It'd be nice if there was a good way to tell if a driver supports
 * netif_carrier, but there really isn't.
 */
static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
{
690
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
691
692
693
694
	static int (* ioctl)(struct net_device *, struct ifreq *, int);
	struct ifreq ifr;
	struct mii_ioctl_data *mii;

695
	if (bond->params.use_carrier)
Linus Torvalds's avatar
Linus Torvalds committed
696
697
		return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;

698
	ioctl = slave_ops->ndo_do_ioctl;
Linus Torvalds's avatar
Linus Torvalds committed
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
	if (ioctl) {
		/* TODO: set pointer to correct ioctl on a per team member */
		/*       bases to make this more efficient. that is, once  */
		/*       we determine the correct ioctl, we will always    */
		/*       call it and not the others for that team          */
		/*       member.                                           */

		/*
		 * We cannot assume that SIOCGMIIPHY will also read a
		 * register; not all network drivers (e.g., e100)
		 * support that.
		 */

		/* Yes, the mii is overlaid on the ifreq.ifr_ifru */
		strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
		mii = if_mii(&ifr);
		if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
			mii->reg_num = MII_BMSR;
			if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
				return (mii->val_out & BMSR_LSTATUS);
			}
		}
	}

723
724
725
726
	/*
	 * Some drivers cache ETHTOOL_GLINK for a period of time so we only
	 * attempt to get link status from it if the above MII ioctls fail.
	 */
Linus Torvalds's avatar
Linus Torvalds committed
727
728
729
730
731
732
733
734
735
736
737
738
	if (slave_dev->ethtool_ops) {
		if (slave_dev->ethtool_ops->get_link) {
			u32 link;

			link = slave_dev->ethtool_ops->get_link(slave_dev);

			return link ? BMSR_LSTATUS : 0;
		}
	}

	/*
	 * If reporting, report that either there's no dev->do_ioctl,
739
	 * or both SIOCGMIIREG and get_link failed (meaning that we
Linus Torvalds's avatar
Linus Torvalds committed
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
	 * cannot report link status).  If not reporting, pretend
	 * we're ok.
	 */
	return (reporting ? -1 : BMSR_LSTATUS);
}

/*----------------------------- Multicast list ------------------------------*/

/*
 * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
 */
static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
{
	return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
			dmi1->dmi_addrlen == dmi2->dmi_addrlen;
}

/*
 * returns dmi entry if found, NULL otherwise
 */
static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
{
	struct dev_mc_list *idmi;

	for (idmi = mc_list; idmi; idmi = idmi->next) {
		if (bond_is_dmi_same(dmi, idmi)) {
			return idmi;
		}
	}

	return NULL;
}

/*
 * Push the promiscuity flag down to appropriate slaves
 */
776
static int bond_set_promiscuity(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
777
{
778
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
779
780
781
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
782
783
			err = dev_set_promiscuity(bond->curr_active_slave->dev,
						  inc);
Linus Torvalds's avatar
Linus Torvalds committed
784
785
786
787
788
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
789
790
791
			err = dev_set_promiscuity(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
792
793
		}
	}
794
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
795
796
797
798
799
}

/*
 * Push the allmulti flag down to all slaves
 */
800
static int bond_set_allmulti(struct bonding *bond, int inc)
Linus Torvalds's avatar
Linus Torvalds committed
801
{
802
	int err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
803
804
805
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
806
807
			err = dev_set_allmulti(bond->curr_active_slave->dev,
					       inc);
Linus Torvalds's avatar
Linus Torvalds committed
808
809
810
811
812
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
813
814
815
			err = dev_set_allmulti(slave->dev, inc);
			if (err)
				return err;
Linus Torvalds's avatar
Linus Torvalds committed
816
817
		}
	}
818
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
}

/*
 * Add a Multicast address to slaves
 * according to mode
 */
static void bond_mc_add(struct bonding *bond, void *addr, int alen)
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
			dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
			dev_mc_add(slave->dev, addr, alen, 0);
		}
	}
}

/*
 * Remove a multicast address from slave
 * according to mode
 */
static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
			dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
			dev_mc_delete(slave->dev, addr, alen, 0);
		}
	}
}

861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882

/*
 * Retrieve the list of registered multicast addresses for the bonding
 * device and retransmit an IGMP JOIN request to the current active
 * slave.
 */
static void bond_resend_igmp_join_requests(struct bonding *bond)
{
	struct in_device *in_dev;
	struct ip_mc_list *im;

	rcu_read_lock();
	in_dev = __in_dev_get_rcu(bond->dev);
	if (in_dev) {
		for (im = in_dev->mc_list; im; im = im->next) {
			ip_mc_rejoin_group(im);
		}
	}

	rcu_read_unlock();
}

Linus Torvalds's avatar
Linus Torvalds committed
883
884
885
886
887
888
889
890
891
892
893
894
895
/*
 * Totally destroys the mc_list in bond
 */
static void bond_mc_list_destroy(struct bonding *bond)
{
	struct dev_mc_list *dmi;

	dmi = bond->mc_list;
	while (dmi) {
		bond->mc_list = dmi->next;
		kfree(dmi);
		dmi = bond->mc_list;
	}
896
        bond->mc_list = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
897
898
899
900
901
}

/*
 * Copy all the Multicast addresses from src to the bonding device dst
 */
902
static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
903
			     gfp_t gfp_flag)
Linus Torvalds's avatar
Linus Torvalds committed
904
905
906
907
{
	struct dev_mc_list *dmi, *new_dmi;

	for (dmi = mc_list; dmi; dmi = dmi->next) {
908
		new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
Linus Torvalds's avatar
Linus Torvalds committed
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930

		if (!new_dmi) {
			/* FIXME: Potential memory leak !!! */
			return -ENOMEM;
		}

		new_dmi->next = bond->mc_list;
		bond->mc_list = new_dmi;
		new_dmi->dmi_addrlen = dmi->dmi_addrlen;
		memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
		new_dmi->dmi_users = dmi->dmi_users;
		new_dmi->dmi_gusers = dmi->dmi_gusers;
	}

	return 0;
}

/*
 * flush all members of flush->mc_list from device dev->mc_list
 */
static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
{
931
	struct bonding *bond = netdev_priv(bond_dev);
Linus Torvalds's avatar
Linus Torvalds committed
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
	struct dev_mc_list *dmi;

	for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
		dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
	}

	if (bond->params.mode == BOND_MODE_8023AD) {
		/* del lacpdu mc addr from mc list */
		u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;

		dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
	}
}

/*--------------------------- Active slave change ---------------------------*/

/*
 * Update the mc list and multicast-related flags for the new and
 * old active slaves (if any) according to the multicast mode, and
 * promiscuous flags unconditionally.
 */
static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
{
	struct dev_mc_list *dmi;

	if (!USES_PRIMARY(bond->params.mode)) {
		/* nothing to do -  mc list is already up-to-date on
		 * all slaves
		 */
		return;
	}

	if (old_active) {
		if (bond->dev->flags & IFF_PROMISC) {
			dev_set_promiscuity(old_active->dev, -1);
		}

		if (bond->dev->flags & IFF_ALLMULTI) {
			dev_set_allmulti(old_active->dev, -1);
		}

		for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
			dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
		}
	}

	if (new_active) {
979
		/* FIXME: Signal errors upstream. */
Linus Torvalds's avatar
Linus Torvalds committed
980
981
982
983
984
985
986
987
988
989
990
		if (bond->dev->flags & IFF_PROMISC) {
			dev_set_promiscuity(new_active->dev, 1);
		}

		if (bond->dev->flags & IFF_ALLMULTI) {
			dev_set_allmulti(new_active->dev, 1);
		}

		for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
			dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
		}
991
		bond_resend_igmp_join_requests(bond);
Linus Torvalds's avatar
Linus Torvalds committed
992
993
994
	}
}

995
996
997
998
999
1000
1001
1002
1003
1004
/*
 * bond_do_fail_over_mac
 *
 * Perform special MAC address swapping for fail_over_mac settings
 *
 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 */
static void bond_do_fail_over_mac(struct bonding *bond,
				  struct slave *new_active,
				  struct slave *old_active)
1005
1006
1007
1008
	__releases(&bond->curr_slave_lock)
	__releases(&bond->lock)
	__acquires(&bond->lock)
	__acquires(&bond->curr_slave_lock)
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
{
	u8 tmp_mac[ETH_ALEN];
	struct sockaddr saddr;
	int rv;

	switch (bond->params.fail_over_mac) {
	case BOND_FOM_ACTIVE:
		if (new_active)
			memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
			       new_active->dev->addr_len);
		break;
	case BOND_FOM_FOLLOW:
		/*
		 * if new_active && old_active, swap them
		 * if just old_active, do nothing (going to no active slave)
		 * if just new_active, set new_active to bond's MAC
		 */
		if (!new_active)
			return;

		write_unlock_bh(&bond->curr_slave_lock);
		read_unlock(&bond->lock);

		if (old_active) {
			memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
			memcpy(saddr.sa_data, old_active->dev->dev_addr,
			       ETH_ALEN);
			saddr.sa_family = new_active->dev->type;
		} else {
			memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
			saddr.sa_family = bond->dev->type;
		}

		rv = dev_set_mac_address(new_active->dev, &saddr);
		if (rv) {
			printk(KERN_ERR DRV_NAME
			       ": %s: Error %d setting MAC of slave %s\n",
			       bond->dev->name, -rv, new_active->dev->name);
			goto out;
		}

		if (!old_active)
			goto out;

		memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
		saddr.sa_family = old_active->dev->type;

		rv = dev_set_mac_address(old_active->dev, &saddr);
		if (rv)
			printk(KERN_ERR DRV_NAME
			       ": %s: Error %d setting MAC of slave %s\n",
			       bond->dev->name, -rv, new_active->dev->name);
out:
		read_lock(&bond->lock);
		write_lock_bh(&bond->curr_slave_lock);
		break;
	default:
		printk(KERN_ERR DRV_NAME
		       ": %s: bond_do_fail_over_mac impossible: bad policy %d\n",
		       bond->dev->name, bond->params.fail_over_mac);
		break;
	}

}


Linus Torvalds's avatar
Linus Torvalds committed
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
/**
 * find_best_interface - select the best available slave to be the active one
 * @bond: our bonding struct
 *
 * Warning: Caller must hold curr_slave_lock for writing.
 */
static struct slave *bond_find_best_slave(struct bonding *bond)
{
	struct slave *new_active, *old_active;
	struct slave *bestslave = NULL;
	int mintime = bond->params.updelay;
	int i;

	new_active = old_active = bond->curr_active_slave;

	if (!new_active) { /* there were no active slaves left */
		if (bond->slave_cnt > 0) {  /* found one slave */
			new_active = bond->first_slave;
		} else {
			return NULL; /* still no slave, return NULL */
		}
	}

	/* first try the primary link; if arping, a link must tx/rx traffic
	 * before it can be considered the curr_active_slave - also, we would skip
	 * slaves between the curr_active_slave and primary_slave that may be up
	 * and able to arp
	 */
	if ((bond->primary_slave) &&
	    (!bond->params.arp_interval) &&
	    (IS_UP(bond->primary_slave->dev))) {
		new_active = bond->primary_slave;
	}

	/* remember where to stop iterating over the slaves */
	old_active = new_active;

	bond_for_each_slave_from(bond, new_active, i, old_active) {
		if (IS_UP(new_active->dev)) {
			if (new_active->link == BOND_LINK_UP) {
				return new_active;
			} else if (new_active->link == BOND_LINK_BACK) {
				/* link up, but waiting for stabilization */
				if (new_active->delay < mintime) {
					mintime = new_active->delay;
					bestslave = new_active;
				}
			}
		}
	}

	return bestslave;
}

/**
 * change_active_interface - change the active slave into the specified one
 * @bond: our bonding struct
 * @new: the new slave to make the active one
 *
 * Set the new slave to the bond's settings and unset them on the old
 * curr_active_slave.
 * Setting include flags, mc-list, promiscuity, allmulti, etc.
 *
 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 * because it is apparently the best available slave we have, even though its
 * updelay hasn't timed out yet.
 *
1142
1143
 * If new_active is not NULL, caller must hold bond->lock for read and
 * curr_slave_lock for write_bh.
Linus Torvalds's avatar
Linus Torvalds committed
1144
 */
1145
void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
Linus Torvalds's avatar
Linus Torvalds committed
1146
1147
1148
1149
1150
1151
1152
1153
{
	struct slave *old_active = bond->curr_active_slave;

	if (old_active == new_active) {
		return;
	}

	if (new_active) {
1154
1155
		new_active->jiffies = jiffies;

Linus Torvalds's avatar
Linus Torvalds committed
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
		if (new_active->link == BOND_LINK_BACK) {
			if (USES_PRIMARY(bond->params.mode)) {
				printk(KERN_INFO DRV_NAME
				       ": %s: making interface %s the new "
				       "active one %d ms earlier.\n",
				       bond->dev->name, new_active->dev->name,
				       (bond->params.updelay - new_active->delay) * bond->params.miimon);
			}

			new_active->delay = 0;
			new_active->link = BOND_LINK_UP;

			if (bond->params.mode == BOND_MODE_8023AD) {
				bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
			}

1172
			if (bond_is_lb(bond))
Linus Torvalds's avatar
Linus Torvalds committed
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
				bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
		} else {
			if (USES_PRIMARY(bond->params.mode)) {
				printk(KERN_INFO DRV_NAME
				       ": %s: making interface %s the new "
				       "active one.\n",
				       bond->dev->name, new_active->dev->name);
			}
		}
	}

	if (USES_PRIMARY(bond->params.mode)) {
		bond_mc_swap(bond, new_active, old_active);
	}

1188
	if (bond_is_lb(bond)) {
Linus Torvalds's avatar
Linus Torvalds committed
1189
		bond_alb_handle_active_change(bond, new_active);
1190
1191
1192
1193
		if (old_active)
			bond_set_slave_inactive_flags(old_active);
		if (new_active)
			bond_set_slave_active_flags(new_active);
Linus Torvalds's avatar
Linus Torvalds committed
1194
1195
1196
	} else {
		bond->curr_active_slave = new_active;
	}
Jay Vosburgh's avatar
Jay Vosburgh committed
1197
1198
1199
1200
1201
1202
1203
1204

	if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
		if (old_active) {
			bond_set_slave_inactive_flags(old_active);
		}

		if (new_active) {
			bond_set_slave_active_flags(new_active);
1205

1206
1207
1208
			if (bond->params.fail_over_mac)
				bond_do_fail_over_mac(bond, new_active,
						      old_active);
1209

1210
			bond->send_grat_arp = bond->params.num_grat_arp;
1211
			bond_send_gratuitous_arp(bond);
1212

1213
1214
1215
			bond->send_unsol_na = bond->params.num_unsol_na;
			bond_send_unsolicited_na(bond);

1216
1217
1218
1219
1220
1221
1222
			write_unlock_bh(&bond->curr_slave_lock);
			read_unlock(&bond->lock);

			netdev_bonding_change(bond->dev);

			read_lock(&bond->lock);
			write_lock_bh(&bond->curr_slave_lock);
1223
		}
Jay Vosburgh's avatar
Jay Vosburgh committed
1224
	}
Linus Torvalds's avatar
Linus Torvalds committed
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
}

/**
 * bond_select_active_slave - select a new active slave, if needed
 * @bond: our bonding struct
 *
 * This functions shoud be called when one of the following occurs:
 * - The old curr_active_slave has been released or lost its link.
 * - The primary_slave has got its link back.
 * - A slave has got its link back and there's no old curr_active_slave.
 *
1236
 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
Linus Torvalds's avatar
Linus Torvalds committed
1237
 */
1238
void bond_select_active_slave(struct bonding *bond)
Linus Torvalds's avatar
Linus Torvalds committed
1239
1240
{
	struct slave *best_slave;
1241
	int rv;
Linus Torvalds's avatar
Linus Torvalds committed
1242
1243
1244
1245

	best_slave = bond_find_best_slave(bond);
	if (best_slave != bond->curr_active_slave) {
		bond_change_active_slave(bond, best_slave);
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
		rv = bond_set_carrier(bond);
		if (!rv)
			return;

		if (netif_carrier_ok(bond->dev)) {
			printk(KERN_INFO DRV_NAME
			       ": %s: first active interface up!\n",
			       bond->dev->name);
		} else {
			printk(KERN_INFO DRV_NAME ": %s: "
			       "now running without any active interface !\n",
			       bond->dev->name);
		}
Linus Torvalds's avatar
Linus Torvalds committed
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
	}
}

/*--------------------------- slave list handling ---------------------------*/

/*
 * This function attaches the slave to the end of list.
 *
 * bond->lock held for writing by caller.
 */
static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
{
	if (bond->first_slave == NULL) { /* attaching the first slave */
		new_slave->next = new_slave;
		new_slave->prev = new_slave;
		bond->first_slave = new_slave;
	} else {
		new_slave->next = bond->first_slave;
		new_slave->prev = bond->first_slave->prev;
		new_slave->next->prev = new_slave;
		new_slave->prev->next = new_slave;
	}

	bond->slave_cnt++;
}

/*
 * This function detaches the slave from the list.
 * WARNING: no check is made to verify if the slave effectively
 * belongs to <bond>.
 * Nothing is freed on return, structures are just unchained.
 * If any slave pointer in bond was pointing to <slave>,
 * it should be changed by the calling function.
 *
 * bond->lock held for writing by caller.
 */
static void bond_detach_slave(struct bonding *bond, struct slave *slave)
{
	if (slave->next) {
		slave->next->prev = slave->prev;
	}

	if (slave->prev) {
		slave->prev->next = slave->next;
	}

	if (bond->first_slave == slave) { /* slave is the first slave */
		if (bond->slave_cnt > 1) { /* there are more slave */
			bond->first_slave = slave->next;
		} else {
			bond->first_slave = NULL; /* slave was the last one */
		}
	}

	slave->next = NULL;
	slave->prev = NULL;
	bond->slave_cnt--;
}

/*---------------------------------- IOCTL ----------------------------------*/

1320
1321
static int bond_sethwaddr(struct net_device *bond_dev,
			  struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
1322
{
1323
1324
1325
	pr_debug("bond_dev=%p\n", bond_dev);
	pr_debug("slave_dev=%p\n", slave_dev);
	pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
Linus Torvalds's avatar
Linus Torvalds committed
1326
1327
1328
1329
	memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
	return 0;
}

1330
1331
1332
#define BOND_VLAN_FEATURES \
	(NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
	 NETIF_F_HW_VLAN_FILTER)
1333
1334

/* 
1335
 * Compute the common dev->feature set available to all slaves.  Some
1336
1337
 * feature bits are managed elsewhere, so preserve those feature bits
 * on the master device.
1338
1339
1340
1341
1342
 */
static int bond_compute_features(struct bonding *bond)
{
	struct slave *slave;
	struct net_device *bond_dev = bond->dev;
1343
	unsigned long features = bond_dev->features;
1344
1345
	unsigned short max_hard_header_len = max((u16)ETH_HLEN,
						bond_dev->hard_header_len);
1346
	int i;
1347

1348
	features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1349
1350
1351
1352
1353
1354
	features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;

	if (!bond->first_slave)
		goto done;

	features &= ~NETIF_F_ONE_FOR_ALL;
1355

1356
	bond_for_each_slave(bond, slave, i) {
1357
1358
1359
		features = netdev_increment_features(features,
						     slave->dev->features,
						     NETIF_F_ONE_FOR_ALL);
1360
1361
1362
		if (slave->dev->hard_header_len > max_hard_header_len)
			max_hard_header_len = slave->dev->hard_header_len;
	}
1363

1364
done:
1365
	features |= (bond_dev->features & BOND_VLAN_FEATURES);
1366
	bond_dev->features = netdev_fix_features(features, NULL);
1367
	bond_dev->hard_header_len = max_hard_header_len;
1368
1369
1370
1371

	return 0;
}

1372
1373
1374
static void bond_setup_by_slave(struct net_device *bond_dev,
				struct net_device *slave_dev)
{
1375
	struct bonding *bond = netdev_priv(bond_dev);
1376

1377
	bond_dev->header_ops	    = slave_dev->header_ops;
1378
1379
1380
1381
1382
1383
1384

	bond_dev->type		    = slave_dev->type;
	bond_dev->hard_header_len   = slave_dev->hard_header_len;
	bond_dev->addr_len	    = slave_dev->addr_len;

	memcpy(bond_dev->broadcast, slave_dev->broadcast,
		slave_dev->addr_len);
1385
	bond->setup_by_slave = 1;
1386
1387
}

Linus Torvalds's avatar
Linus Torvalds committed
1388
/* enslave device <slave> to bond device <master> */
1389
int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
Linus Torvalds's avatar
Linus Torvalds committed
1390
{
1391
	struct bonding *bond = netdev_priv(bond_dev);
1392
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
Linus Torvalds's avatar
Linus Torvalds committed
1393
1394
1395
1396
1397
1398
1399
	struct slave *new_slave = NULL;
	struct dev_mc_list *dmi;
	struct sockaddr addr;
	int link_reporting;
	int old_features = bond_dev->features;
	int res = 0;

1400
	if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1401
		slave_ops->ndo_do_ioctl == NULL) {
Linus Torvalds's avatar
Linus Torvalds committed
1402
		printk(KERN_WARNING DRV_NAME
1403
1404
		       ": %s: Warning: no link monitoring support for %s\n",
		       bond_dev->name, slave_dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
1405
1406
1407
1408
	}

	/* bond must be initialized by bond_open() before enslaving */
	if (!(bond_dev->flags & IFF_UP)) {
1409
1410
1411
		printk(KERN_WARNING DRV_NAME
			" %s: master_dev is not up in bond_enslave\n",
			bond_dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
1412
1413
1414
1415
	}

	/* already enslaved */
	if (slave_dev->flags & IFF_SLAVE) {
1416
		pr_debug("Error, Device was already enslaved\n");
Linus Torvalds's avatar
Linus Torvalds committed
1417
1418
1419
1420
1421
1422
		return -EBUSY;
	}

	/* vlan challenged mutual exclusion */
	/* no need to lock since we're protected by rtnl_lock */
	if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1423
		pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
1424
1425
		if (!list_empty(&bond->vlan_list)) {
			printk(KERN_ERR DRV_NAME
1426
			       ": %s: Error: cannot enslave VLAN "
Linus Torvalds's avatar
Linus Torvalds committed
1427
			       "challenged slave %s on VLAN enabled "
1428
			       "bond %s\n", bond_dev->name, slave_dev->name,
Linus Torvalds's avatar
Linus Torvalds committed
1429
1430
1431
1432
			       bond_dev->name);
			return -EPERM;
		} else {
			printk(KERN_WARNING DRV_NAME
1433
			       ": %s: Warning: enslaved VLAN challenged "
Linus Torvalds's avatar
Linus Torvalds committed
1434
1435
			       "slave %s. Adding VLANs will be blocked as "
			       "long as %s is part of bond %s\n",
1436
			       bond_dev->name, slave_dev->name, slave_dev->name,
Linus Torvalds's avatar
Linus Torvalds committed
1437
1438
1439
1440
			       bond_dev->name);
			bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
		}
	} else {
1441
		pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
Linus Torvalds's avatar
Linus Torvalds committed
1442
1443
1444
1445
1446
1447
1448
1449
		if (bond->slave_cnt == 0) {
			/* First slave, and it is not VLAN challenged,
			 * so remove the block of adding VLANs over the bond.
			 */
			bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
		}
	}

1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
	/*
	 * Old ifenslave binaries are no longer supported.  These can
	 * be identified with moderate accurary by the state of the slave:
	 * the current ifenslave will set the interface down prior to
	 * enslaving it; the old ifenslave will not.
	 */
	if ((slave_dev->flags & IFF_UP)) {
		printk(KERN_ERR DRV_NAME ": %s is up. "
		       "This may be due to an out of date ifenslave.\n",
		       slave_dev->name);
		res = -EPERM;
		goto err_undo_flags;
	}
Linus Torvalds's avatar
Linus Torvalds committed
1463

1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
	/* set bonding device ether type by slave - bonding netdevices are
	 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
	 * there is a need to override some of the type dependent attribs/funcs.
	 *
	 * bond ether type mutual exclusion - don't allow slaves of dissimilar
	 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
	 */
	if (bond->slave_cnt == 0) {
		if (slave_dev->type != ARPHRD_ETHER)
			bond_setup_by_slave(bond_dev, slave_dev);
	} else if (bond_dev->type != slave_dev->type) {
		printk(KERN_ERR DRV_NAME ": %s ether type (%d) is different "
			"from other slaves (%d), can not enslave it.\n",
			slave_dev->name,
			slave_dev->type, bond_dev->type);
			res = -EINVAL;
			goto err_undo_flags;
	}

1483
	if (slave_ops->ndo_set_mac_address == NULL) {
1484
1485
		if (bond->slave_cnt == 0) {
			printk(KERN_WARNING DRV_NAME
1486
1487
			       ": %s: Warning: The first slave device "
			       "specified does not support setting the MAC "
1488
			       "address. Setting fail_over_mac to active.",
1489
			       bond_dev->name);
1490
1491
			bond->params.fail_over_mac = BOND_FOM_ACTIVE;
		} else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1492
			printk(KERN_ERR DRV_NAME
1493
1494
				": %s: Error: The slave device specified "
				"does not support setting the MAC address, "
1495
				"but fail_over_mac is not set to active.\n"
1496
1497
1498
1499
				, bond_dev->name);
			res = -EOPNOTSUPP;
			goto err_undo_flags;
		}
Linus Torvalds's avatar
Linus Torvalds committed
1500
1501
	}

1502
	new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
	if (!new_slave) {
		res = -ENOMEM;
		goto err_undo_flags;
	}

	/* save slave's original flags before calling
	 * netdev_set_master and dev_open
	 */
	new_slave->original_flags = slave_dev->flags;

1513
1514
1515
1516
1517
1518
	/*
	 * Save slave's original ("permanent") mac address for modes
	 * that need it, and for restoring it upon release, and then
	 * set it to the master's address
	 */
	memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
Linus Torvalds's avatar
Linus Torvalds committed
1519

1520
	if (!bond->params.fail_over_mac) {
1521
1522
1523
1524
1525
1526
1527
1528
		/*
		 * Set slave to master's mac address.  The application already
		 * set the master's mac address to that of the first slave
		 */
		memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
		addr.sa_family = slave_dev->type;
		res = dev_set_mac_address(slave_dev, &addr);
		if (res) {
1529
			pr_debug("Error %d calling set_mac_address\n", res);
1530
1531
			goto err_free;
		}
1532
	}
Linus Torvalds's avatar
Linus Torvalds committed
1533

1534
1535
	res = netdev_set_master(slave_dev, bond_dev);
	if (res) {
1536
		pr_debug("Error %d calling netdev_set_master\n", res);
1537
		goto err_restore_mac;
1538
	}
1539
1540
1541
	/* open the slave since the application closed it */
	res = dev_open(slave_dev);
	if (res) {
1542
		pr_debug("Openning slave %s failed\n", slave_dev->name);
1543
		goto err_unset_master;
Linus Torvalds's avatar
Linus Torvalds committed
1544
1545
1546
	}

	new_slave->dev = slave_dev;
1547
	slave_dev->priv_flags |= IFF_BONDING;
Linus Torvalds's avatar
Linus Torvalds committed
1548

1549
	if (bond_is_lb(bond)) {
Linus Torvalds's avatar
Linus Torvalds committed
1550
1551
1552
1553
1554
		/* bond_alb_init_slave() must be called before all other stages since
		 * it might fail and we do not want to have to undo everything
		 */
		res = bond_alb_init_slave(bond, new_slave);
		if (res) {
1555
			goto err_close;
Linus Torvalds's avatar
Linus Torvalds committed
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
		}
	}

	/* If the mode USES_PRIMARY, then the new slave gets the
	 * master's promisc (and mc) settings only if it becomes the
	 * curr_active_slave, and that is taken care of later when calling
	 * bond_change_active()
	 */
	if (!USES_PRIMARY(bond->params.mode)) {
		/* set promiscuity level to new slave */
		if (bond_dev->flags & IFF_PROMISC) {
1567
1568
1569
			res = dev_set_promiscuity(slave_dev, 1);
			if (res)
				goto err_close;
Linus Torvalds's avatar
Linus Torvalds committed
1570
1571
1572
1573
		}

		/* set allmulti level to new slave */
		if (bond_dev->flags & IFF_ALLMULTI) {
1574
1575
1576
			res = dev_set_allmulti(slave_dev, 1);
			if (res)
				goto err_close;
Linus Torvalds's avatar
Linus Torvalds committed
1577
1578
		}