bearer.c 25.3 KB
Newer Older
Per Liden's avatar
Per Liden committed
1
2
/*
 * net/tipc/bearer.c: TIPC bearer code
3
 *
4
 * Copyright (c) 1996-2006, 2013-2014, Ericsson AB
5
 * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
Per Liden's avatar
Per Liden committed
6
7
 * All rights reserved.
 *
Per Liden's avatar
Per Liden committed
8
 * Redistribution and use in source and binary forms, with or without
Per Liden's avatar
Per Liden committed
9
10
 * modification, are permitted provided that the following conditions are met:
 *
Per Liden's avatar
Per Liden committed
11
12
13
14
15
16
17
18
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
Per Liden's avatar
Per Liden committed
19
 *
Per Liden's avatar
Per Liden committed
20
21
22
23
24
25
26
27
28
29
30
31
32
33
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Per Liden's avatar
Per Liden committed
34
35
36
 * POSSIBILITY OF SUCH DAMAGE.
 */

37
#include <net/sock.h>
Per Liden's avatar
Per Liden committed
38
39
#include "core.h"
#include "bearer.h"
40
#include "link.h"
Per Liden's avatar
Per Liden committed
41
#include "discover.h"
42
#include "bcast.h"
Per Liden's avatar
Per Liden committed
43

44
#define MAX_ADDR_STR 60
Per Liden's avatar
Per Liden committed
45

46
static struct tipc_media * const media_info_array[] = {
47
48
49
	&eth_media_info,
#ifdef CONFIG_TIPC_MEDIA_IB
	&ib_media_info,
Erik Hugne's avatar
Erik Hugne committed
50
51
52
#endif
#ifdef CONFIG_TIPC_MEDIA_UDP
	&udp_media_info,
53
54
55
#endif
	NULL
};
Per Liden's avatar
Per Liden committed
56

57
58
59
60
61
62
63
64
65
66
67
static const struct nla_policy
tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1]	= {
	[TIPC_NLA_BEARER_UNSPEC]		= { .type = NLA_UNSPEC },
	[TIPC_NLA_BEARER_NAME] = {
		.type = NLA_STRING,
		.len = TIPC_MAX_BEARER_NAME
	},
	[TIPC_NLA_BEARER_PROP]			= { .type = NLA_NESTED },
	[TIPC_NLA_BEARER_DOMAIN]		= { .type = NLA_U32 }
};

68
69
70
71
72
73
static const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
	[TIPC_NLA_MEDIA_UNSPEC]		= { .type = NLA_UNSPEC },
	[TIPC_NLA_MEDIA_NAME]		= { .type = NLA_STRING },
	[TIPC_NLA_MEDIA_PROP]		= { .type = NLA_NESTED }
};

74
static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr);
75

Per Liden's avatar
Per Liden committed
76
/**
77
 * tipc_media_find - locates specified media object by name
Per Liden's avatar
Per Liden committed
78
 */
79
struct tipc_media *tipc_media_find(const char *name)
Per Liden's avatar
Per Liden committed
80
81
82
{
	u32 i;

83
84
	for (i = 0; media_info_array[i] != NULL; i++) {
		if (!strcmp(media_info_array[i]->name, name))
85
			break;
Per Liden's avatar
Per Liden committed
86
	}
87
	return media_info_array[i];
Per Liden's avatar
Per Liden committed
88
89
}

90
91
92
/**
 * media_find_id - locates specified media object by type identifier
 */
93
static struct tipc_media *media_find_id(u8 type)
94
95
96
{
	u32 i;

97
98
	for (i = 0; media_info_array[i] != NULL; i++) {
		if (media_info_array[i]->type_id == type)
99
			break;
100
	}
101
	return media_info_array[i];
Per Liden's avatar
Per Liden committed
102
103
104
}

/**
105
 * tipc_media_addr_printf - record media address in print buffer
Per Liden's avatar
Per Liden committed
106
 */
107
void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
Per Liden's avatar
Per Liden committed
108
{
109
	char addr_str[MAX_ADDR_STR];
110
	struct tipc_media *m_ptr;
111
	int ret;
Per Liden's avatar
Per Liden committed
112

113
	m_ptr = media_find_id(a->media_id);
Per Liden's avatar
Per Liden committed
114

115
	if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
Richard Alpe's avatar
Richard Alpe committed
116
		ret = scnprintf(buf, len, "%s(%s)", m_ptr->name, addr_str);
117
118
	else {
		u32 i;
Per Liden's avatar
Per Liden committed
119

Richard Alpe's avatar
Richard Alpe committed
120
		ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
121
		for (i = 0; i < sizeof(a->value); i++)
Richard Alpe's avatar
Richard Alpe committed
122
			ret += scnprintf(buf - ret, len + ret,
123
					    "-%02x", a->value[i]);
Per Liden's avatar
Per Liden committed
124
125
126
127
128
	}
}

/**
 * bearer_name_validate - validate & (optionally) deconstruct bearer name
129
130
 * @name: ptr to bearer name string
 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
131
 *
Per Liden's avatar
Per Liden committed
132
133
 * Returns 1 if bearer name is valid, otherwise 0.
 */
134
static int bearer_name_validate(const char *name,
135
				struct tipc_bearer_names *name_parts)
Per Liden's avatar
Per Liden committed
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
{
	char name_copy[TIPC_MAX_BEARER_NAME];
	char *media_name;
	char *if_name;
	u32 media_len;
	u32 if_len;

	/* copy bearer name & ensure length is OK */
	name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
	/* need above in case non-Posix strncpy() doesn't pad with nulls */
	strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
	if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
		return 0;

	/* ensure all component parts of bearer name are present */
	media_name = name_copy;
152
153
	if_name = strchr(media_name, ':');
	if (if_name == NULL)
Per Liden's avatar
Per Liden committed
154
155
156
157
158
159
		return 0;
	*(if_name++) = 0;
	media_len = if_name - media_name;
	if_len = strlen(if_name) + 1;

	/* validate component parts of bearer name */
160
	if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
161
	    (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
Per Liden's avatar
Per Liden committed
162
163
164
165
166
167
168
169
170
171
172
		return 0;

	/* return bearer name components, if necessary */
	if (name_parts) {
		strcpy(name_parts->media_name, media_name);
		strcpy(name_parts->if_name, if_name);
	}
	return 1;
}

/**
173
 * tipc_bearer_find - locates bearer object with matching bearer name
Per Liden's avatar
Per Liden committed
174
 */
175
struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
Per Liden's avatar
Per Liden committed
176
{
177
	struct tipc_net *tn = net_generic(net, tipc_net_id);
178
	struct tipc_bearer *b_ptr;
Per Liden's avatar
Per Liden committed
179
180
	u32 i;

181
	for (i = 0; i < MAX_BEARERS; i++) {
182
		b_ptr = rtnl_dereference(tn->bearer_list[i]);
183
		if (b_ptr && (!strcmp(b_ptr->name, name)))
Per Liden's avatar
Per Liden committed
184
185
			return b_ptr;
	}
186
	return NULL;
Per Liden's avatar
Per Liden committed
187
188
}

189
void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
Per Liden's avatar
Per Liden committed
190
{
191
	struct tipc_net *tn = net_generic(net, tipc_net_id);
192
193
194
	struct tipc_bearer *b_ptr;

	rcu_read_lock();
195
	b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
196
	if (b_ptr) {
197
		tipc_bcbearer_sort(net, &b_ptr->nodes, dest, true);
198
199
200
		tipc_disc_add_dest(b_ptr->link_req);
	}
	rcu_read_unlock();
Per Liden's avatar
Per Liden committed
201
202
}

203
void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
Per Liden's avatar
Per Liden committed
204
{
205
	struct tipc_net *tn = net_generic(net, tipc_net_id);
206
207
208
	struct tipc_bearer *b_ptr;

	rcu_read_lock();
209
	b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
210
	if (b_ptr) {
211
		tipc_bcbearer_sort(net, &b_ptr->nodes, dest, false);
212
213
214
		tipc_disc_remove_dest(b_ptr->link_req);
	}
	rcu_read_unlock();
Per Liden's avatar
Per Liden committed
215
216
217
218
}

/**
 * tipc_enable_bearer - enable bearer with the given name
219
 */
220
static int tipc_enable_bearer(struct net *net, const char *name,
Erik Hugne's avatar
Erik Hugne committed
221
222
			      u32 disc_domain, u32 priority,
			      struct nlattr *attr[])
Per Liden's avatar
Per Liden committed
223
{
224
	struct tipc_net *tn = net_generic(net, tipc_net_id);
225
	struct tipc_bearer *b_ptr;
226
	struct tipc_media *m_ptr;
227
	struct tipc_bearer_names b_names;
Per Liden's avatar
Per Liden committed
228
229
230
231
232
233
	char addr_string[16];
	u32 bearer_id;
	u32 with_this_prio;
	u32 i;
	int res = -EINVAL;

234
	if (!tn->own_addr) {
235
236
		pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
			name);
Per Liden's avatar
Per Liden committed
237
		return -ENOPROTOOPT;
238
	}
239
	if (!bearer_name_validate(name, &b_names)) {
240
		pr_warn("Bearer <%s> rejected, illegal name\n", name);
241
		return -EINVAL;
242
	}
243
	if (tipc_addr_domain_valid(disc_domain) &&
244
245
246
	    (disc_domain != tn->own_addr)) {
		if (tipc_in_scope(disc_domain, tn->own_addr)) {
			disc_domain = tn->own_addr & TIPC_CLUSTER_MASK;
247
			res = 0;   /* accept any node in own cluster */
248
		} else if (in_own_cluster_exact(net, disc_domain))
249
250
251
			res = 0;   /* accept specified node in own cluster */
	}
	if (res) {
252
253
		pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
			name);
254
255
		return -EINVAL;
	}
256
	if ((priority > TIPC_MAX_LINK_PRI) &&
257
	    (priority != TIPC_MEDIA_LINK_PRI)) {
258
		pr_warn("Bearer <%s> rejected, illegal priority\n", name);
Per Liden's avatar
Per Liden committed
259
		return -EINVAL;
260
	}
Per Liden's avatar
Per Liden committed
261

262
	m_ptr = tipc_media_find(b_names.media_name);
Per Liden's avatar
Per Liden committed
263
	if (!m_ptr) {
264
265
		pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
			name, b_names.media_name);
Ying Xue's avatar
Ying Xue committed
266
		return -EINVAL;
Per Liden's avatar
Per Liden committed
267
	}
268
269

	if (priority == TIPC_MEDIA_LINK_PRI)
Per Liden's avatar
Per Liden committed
270
271
272
273
274
275
		priority = m_ptr->priority;

restart:
	bearer_id = MAX_BEARERS;
	with_this_prio = 1;
	for (i = MAX_BEARERS; i-- != 0; ) {
276
		b_ptr = rtnl_dereference(tn->bearer_list[i]);
277
		if (!b_ptr) {
Per Liden's avatar
Per Liden committed
278
279
280
			bearer_id = i;
			continue;
		}
281
		if (!strcmp(name, b_ptr->name)) {
282
283
			pr_warn("Bearer <%s> rejected, already enabled\n",
				name);
Ying Xue's avatar
Ying Xue committed
284
			return -EINVAL;
Per Liden's avatar
Per Liden committed
285
		}
286
		if ((b_ptr->priority == priority) &&
Per Liden's avatar
Per Liden committed
287
288
		    (++with_this_prio > 2)) {
			if (priority-- == 0) {
289
290
				pr_warn("Bearer <%s> rejected, duplicate priority\n",
					name);
Ying Xue's avatar
Ying Xue committed
291
				return -EINVAL;
Per Liden's avatar
Per Liden committed
292
			}
293
294
			pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
				name, priority + 1, priority);
Per Liden's avatar
Per Liden committed
295
296
297
298
			goto restart;
		}
	}
	if (bearer_id >= MAX_BEARERS) {
299
300
		pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
			name, MAX_BEARERS);
Ying Xue's avatar
Ying Xue committed
301
		return -EINVAL;
Per Liden's avatar
Per Liden committed
302
303
	}

304
	b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
Ying Xue's avatar
Ying Xue committed
305
306
307
	if (!b_ptr)
		return -ENOMEM;

308
	strcpy(b_ptr->name, name);
309
	b_ptr->media = m_ptr;
Erik Hugne's avatar
Erik Hugne committed
310
	res = m_ptr->enable_media(net, b_ptr, attr);
Per Liden's avatar
Per Liden committed
311
	if (res) {
312
313
		pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
			name, -res);
Ying Xue's avatar
Ying Xue committed
314
		return -EINVAL;
Per Liden's avatar
Per Liden committed
315
316
317
	}

	b_ptr->identity = bearer_id;
318
319
	b_ptr->tolerance = m_ptr->tolerance;
	b_ptr->window = m_ptr->window;
320
	b_ptr->domain = disc_domain;
Per Liden's avatar
Per Liden committed
321
322
	b_ptr->net_plane = bearer_id + 'A';
	b_ptr->priority = priority;
323

324
	res = tipc_disc_create(net, b_ptr, &b_ptr->bcast_addr);
325
	if (res) {
326
		bearer_disable(net, b_ptr);
327
328
		pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
			name);
Ying Xue's avatar
Ying Xue committed
329
		return -EINVAL;
330
	}
331

332
	rcu_assign_pointer(tn->bearer_list[bearer_id], b_ptr);
333

334
335
336
	pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
		name,
		tipc_addr_string_fill(addr_string, disc_domain), priority);
Per Liden's avatar
Per Liden committed
337
338
339
340
	return res;
}

/**
341
 * tipc_reset_bearer - Reset all links established over this bearer
Per Liden's avatar
Per Liden committed
342
 */
343
static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b_ptr)
Per Liden's avatar
Per Liden committed
344
{
345
	pr_info("Resetting bearer <%s>\n", b_ptr->name);
346
	tipc_node_delete_links(net, b_ptr->identity);
347
	tipc_disc_reset(net, b_ptr);
348
	return 0;
Per Liden's avatar
Per Liden committed
349
350
351
}

/**
352
 * bearer_disable
353
 *
Ying Xue's avatar
Ying Xue committed
354
 * Note: This routine assumes caller holds RTNL lock.
Per Liden's avatar
Per Liden committed
355
 */
356
static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr)
Per Liden's avatar
Per Liden committed
357
{
358
	struct tipc_net *tn = net_generic(net, tipc_net_id);
359
360
	u32 i;

361
	pr_info("Disabling bearer <%s>\n", b_ptr->name);
362
	b_ptr->media->disable_media(b_ptr);
363

364
	tipc_node_delete_links(net, b_ptr->identity);
365
	RCU_INIT_POINTER(b_ptr->media_ptr, NULL);
366
367
	if (b_ptr->link_req)
		tipc_disc_delete(b_ptr->link_req);
368
369

	for (i = 0; i < MAX_BEARERS; i++) {
370
371
		if (b_ptr == rtnl_dereference(tn->bearer_list[i])) {
			RCU_INIT_POINTER(tn->bearer_list[i], NULL);
372
373
374
			break;
		}
	}
375
	kfree_rcu(b_ptr, rcu);
Per Liden's avatar
Per Liden committed
376
377
}

Erik Hugne's avatar
Erik Hugne committed
378
379
int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
			 struct nlattr *attr[])
380
381
382
383
384
{
	struct net_device *dev;
	char *driver_name = strchr((const char *)b->name, ':') + 1;

	/* Find device with specified name */
385
	dev = dev_get_by_name(net, driver_name);
386
387
388
	if (!dev)
		return -ENODEV;

389
	/* Associate TIPC bearer with L2 bearer */
390
	rcu_assign_pointer(b->media_ptr, dev);
391
	memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
392
393
394
395
	memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
	b->bcast_addr.media_id = b->media->type_id;
	b->bcast_addr.broadcast = 1;
	b->mtu = dev->mtu;
396
	b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
397
398
399
400
	rcu_assign_pointer(dev->tipc_ptr, b);
	return 0;
}

401
/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
402
 *
403
 * Mark L2 bearer as inactive so that incoming buffers are thrown away
404
405
406
 */
void tipc_disable_l2_media(struct tipc_bearer *b)
{
407
408
409
	struct net_device *dev;

	dev = (struct net_device *)rtnl_dereference(b->media_ptr);
410
	RCU_INIT_POINTER(dev->tipc_ptr, NULL);
411
	synchronize_net();
412
413
414
415
	dev_put(dev);
}

/**
416
 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
417
 * @buf: the packet to be sent
stephen hemminger's avatar
stephen hemminger committed
418
 * @b_ptr: the bearer through which the packet is to be sent
419
420
 * @dest: peer destination address
 */
421
422
int tipc_l2_send_msg(struct net *net, struct sk_buff *buf,
		     struct tipc_bearer *b, struct tipc_media_addr *dest)
423
424
{
	struct sk_buff *clone;
425
	struct net_device *dev;
426
	int delta;
427
428
429
430

	dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
	if (!dev)
		return 0;
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457

	clone = skb_clone(buf, GFP_ATOMIC);
	if (!clone)
		return 0;

	delta = dev->hard_header_len - skb_headroom(buf);
	if ((delta > 0) &&
	    pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
		kfree_skb(clone);
		return 0;
	}

	skb_reset_network_header(clone);
	clone->dev = dev;
	clone->protocol = htons(ETH_P_TIPC);
	dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
			dev->dev_addr, clone->len);
	dev_queue_xmit(clone);
	return 0;
}

/* tipc_bearer_send- sends buffer to destination over bearer
 *
 * IMPORTANT:
 * The media send routine must not alter the buffer being passed in
 * as it may be needed for later retransmission!
 */
458
void tipc_bearer_send(struct net *net, u32 bearer_id, struct sk_buff *buf,
459
460
		      struct tipc_media_addr *dest)
{
461
	struct tipc_net *tn = net_generic(net, tipc_net_id);
462
463
464
	struct tipc_bearer *b_ptr;

	rcu_read_lock();
465
	b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
466
	if (likely(b_ptr))
467
		b_ptr->media->send_msg(net, buf, b_ptr, dest);
468
	rcu_read_unlock();
469
470
}

471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
/* tipc_bearer_xmit() -send buffer to destination over bearer
 */
void tipc_bearer_xmit(struct net *net, u32 bearer_id,
		      struct sk_buff_head *xmitq,
		      struct tipc_media_addr *dst)
{
	struct tipc_net *tn = net_generic(net, tipc_net_id);
	struct tipc_bearer *b;
	struct sk_buff *skb, *tmp;

	if (skb_queue_empty(xmitq))
		return;

	rcu_read_lock();
	b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
	if (likely(b)) {
		skb_queue_walk_safe(xmitq, skb, tmp) {
			__skb_dequeue(xmitq);
			b->media->send_msg(net, skb, b, dst);
			/* Until we remove cloning in tipc_l2_send_msg(): */
			kfree_skb(skb);
		}
	}
	rcu_read_unlock();
}

497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
/**
 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
 * @buf: the received packet
 * @dev: the net device that the packet was received on
 * @pt: the packet_type structure which was used to register this handler
 * @orig_dev: the original receive net device in case the device is a bond
 *
 * Accept only packets explicitly sent to this node, or broadcast packets;
 * ignores packets sent using interface multicast, and traffic sent to other
 * nodes (which can happen if interface is running in promiscuous mode).
 */
static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev,
			   struct packet_type *pt, struct net_device *orig_dev)
{
	struct tipc_bearer *b_ptr;

	rcu_read_lock();
514
	b_ptr = rcu_dereference_rtnl(dev->tipc_ptr);
515
516
517
	if (likely(b_ptr)) {
		if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
			buf->next = NULL;
518
			tipc_rcv(dev_net(dev), buf, b_ptr);
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
			rcu_read_unlock();
			return NET_RX_SUCCESS;
		}
	}
	rcu_read_unlock();

	kfree_skb(buf);
	return NET_RX_DROP;
}

/**
 * tipc_l2_device_event - handle device events from network device
 * @nb: the context of the notification
 * @evt: the type of event
 * @ptr: the net device that the event was on
 *
 * This function is called by the Ethernet driver in case of link
 * change event.
 */
static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
				void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
542
543
	struct net *net = dev_net(dev);
	struct tipc_bearer *b_ptr;
544

545
546
	b_ptr = rtnl_dereference(dev->tipc_ptr);
	if (!b_ptr)
547
548
549
550
551
552
553
554
		return NOTIFY_DONE;

	b_ptr->mtu = dev->mtu;

	switch (evt) {
	case NETDEV_CHANGE:
		if (netif_carrier_ok(dev))
			break;
555
	case NETDEV_GOING_DOWN:
556
	case NETDEV_CHANGEMTU:
557
		tipc_reset_bearer(net, b_ptr);
558
		break;
559
	case NETDEV_CHANGEADDR:
560
		b_ptr->media->raw2addr(b_ptr, &b_ptr->addr,
561
				       (char *)dev->dev_addr);
562
		tipc_reset_bearer(net, b_ptr);
563
564
565
		break;
	case NETDEV_UNREGISTER:
	case NETDEV_CHANGENAME:
566
		bearer_disable(dev_net(dev), b_ptr);
567
568
569
570
571
572
		break;
	}
	return NOTIFY_OK;
}

static struct packet_type tipc_packet_type __read_mostly = {
573
	.type = htons(ETH_P_TIPC),
574
575
576
577
578
579
580
581
582
583
	.func = tipc_l2_rcv_msg,
};

static struct notifier_block notifier = {
	.notifier_call  = tipc_l2_device_event,
	.priority	= 0,
};

int tipc_bearer_setup(void)
{
584
585
586
587
588
	int err;

	err = register_netdevice_notifier(&notifier);
	if (err)
		return err;
589
	dev_add_pack(&tipc_packet_type);
590
	return 0;
591
592
593
594
595
596
597
}

void tipc_bearer_cleanup(void)
{
	unregister_netdevice_notifier(&notifier);
	dev_remove_pack(&tipc_packet_type);
}
Per Liden's avatar
Per Liden committed
598

599
void tipc_bearer_stop(struct net *net)
Per Liden's avatar
Per Liden committed
600
{
601
	struct tipc_net *tn = net_generic(net, tipc_net_id);
602
	struct tipc_bearer *b_ptr;
Per Liden's avatar
Per Liden committed
603
604
605
	u32 i;

	for (i = 0; i < MAX_BEARERS; i++) {
606
		b_ptr = rtnl_dereference(tn->bearer_list[i]);
607
		if (b_ptr) {
608
			bearer_disable(net, b_ptr);
609
			tn->bearer_list[i] = NULL;
610
		}
Per Liden's avatar
Per Liden committed
611
612
	}
}
613

614
/* Caller should hold rtnl_lock to protect the bearer */
615
static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
616
				struct tipc_bearer *bearer, int nlflags)
617
618
619
620
621
{
	void *hdr;
	struct nlattr *attrs;
	struct nlattr *prop;

622
	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
623
			  nlflags, TIPC_NL_BEARER_GET);
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
	if (!hdr)
		return -EMSGSIZE;

	attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
	if (!attrs)
		goto msg_full;

	if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
		goto attr_msg_full;

	prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
	if (!prop)
		goto prop_msg_full;
	if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
		goto prop_msg_full;
	if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
		goto prop_msg_full;
	if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
		goto prop_msg_full;

	nla_nest_end(msg->skb, prop);
	nla_nest_end(msg->skb, attrs);
	genlmsg_end(msg->skb, hdr);

	return 0;

prop_msg_full:
	nla_nest_cancel(msg->skb, prop);
attr_msg_full:
	nla_nest_cancel(msg->skb, attrs);
msg_full:
	genlmsg_cancel(msg->skb, hdr);

	return -EMSGSIZE;
}

int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	int err;
	int i = cb->args[0];
	struct tipc_bearer *bearer;
	struct tipc_nl_msg msg;
666
667
	struct net *net = sock_net(skb->sk);
	struct tipc_net *tn = net_generic(net, tipc_net_id);
668
669
670
671
672
673
674
675
676
677

	if (i == MAX_BEARERS)
		return 0;

	msg.skb = skb;
	msg.portid = NETLINK_CB(cb->skb).portid;
	msg.seq = cb->nlh->nlmsg_seq;

	rtnl_lock();
	for (i = 0; i < MAX_BEARERS; i++) {
678
		bearer = rtnl_dereference(tn->bearer_list[i]);
679
680
681
		if (!bearer)
			continue;

682
		err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
		if (err)
			break;
	}
	rtnl_unlock();

	cb->args[0] = i;
	return skb->len;
}

int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
{
	int err;
	char *name;
	struct sk_buff *rep;
	struct tipc_bearer *bearer;
	struct tipc_nl_msg msg;
	struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
700
	struct net *net = genl_info_net(info);
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723

	if (!info->attrs[TIPC_NLA_BEARER])
		return -EINVAL;

	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
			       info->attrs[TIPC_NLA_BEARER],
			       tipc_nl_bearer_policy);
	if (err)
		return err;

	if (!attrs[TIPC_NLA_BEARER_NAME])
		return -EINVAL;
	name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);

	rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!rep)
		return -ENOMEM;

	msg.skb = rep;
	msg.portid = info->snd_portid;
	msg.seq = info->snd_seq;

	rtnl_lock();
724
	bearer = tipc_bearer_find(net, name);
725
726
727
728
729
	if (!bearer) {
		err = -EINVAL;
		goto err_out;
	}

730
	err = __tipc_nl_add_bearer(&msg, bearer, 0);
731
732
733
734
735
736
737
738
739
740
741
742
	if (err)
		goto err_out;
	rtnl_unlock();

	return genlmsg_reply(rep, info);
err_out:
	rtnl_unlock();
	nlmsg_free(rep);

	return err;
}

743
744
745
746
747
748
int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
{
	int err;
	char *name;
	struct tipc_bearer *bearer;
	struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
749
	struct net *net = sock_net(skb->sk);
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765

	if (!info->attrs[TIPC_NLA_BEARER])
		return -EINVAL;

	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
			       info->attrs[TIPC_NLA_BEARER],
			       tipc_nl_bearer_policy);
	if (err)
		return err;

	if (!attrs[TIPC_NLA_BEARER_NAME])
		return -EINVAL;

	name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);

	rtnl_lock();
766
	bearer = tipc_bearer_find(net, name);
767
768
769
770
771
	if (!bearer) {
		rtnl_unlock();
		return -EINVAL;
	}

772
	bearer_disable(net, bearer);
773
774
775
776
777
778
779
780
781
782
	rtnl_unlock();

	return 0;
}

int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
{
	int err;
	char *bearer;
	struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
783
784
	struct net *net = sock_net(skb->sk);
	struct tipc_net *tn = net_generic(net, tipc_net_id);
785
786
787
788
	u32 domain;
	u32 prio;

	prio = TIPC_MEDIA_LINK_PRI;
789
	domain = tn->own_addr & TIPC_CLUSTER_MASK;
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820

	if (!info->attrs[TIPC_NLA_BEARER])
		return -EINVAL;

	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
			       info->attrs[TIPC_NLA_BEARER],
			       tipc_nl_bearer_policy);
	if (err)
		return err;

	if (!attrs[TIPC_NLA_BEARER_NAME])
		return -EINVAL;

	bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);

	if (attrs[TIPC_NLA_BEARER_DOMAIN])
		domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);

	if (attrs[TIPC_NLA_BEARER_PROP]) {
		struct nlattr *props[TIPC_NLA_PROP_MAX + 1];

		err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
					      props);
		if (err)
			return err;

		if (props[TIPC_NLA_PROP_PRIO])
			prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
	}

	rtnl_lock();
Erik Hugne's avatar
Erik Hugne committed
821
	err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
822
823
824
825
826
827
828
829
	if (err) {
		rtnl_unlock();
		return err;
	}
	rtnl_unlock();

	return 0;
}
830
831
832
833
834
835
836

int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
{
	int err;
	char *name;
	struct tipc_bearer *b;
	struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
837
	struct net *net = sock_net(skb->sk);
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852

	if (!info->attrs[TIPC_NLA_BEARER])
		return -EINVAL;

	err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
			       info->attrs[TIPC_NLA_BEARER],
			       tipc_nl_bearer_policy);
	if (err)
		return err;

	if (!attrs[TIPC_NLA_BEARER_NAME])
		return -EINVAL;
	name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);

	rtnl_lock();
853
	b = tipc_bearer_find(net, name);
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
	if (!b) {
		rtnl_unlock();
		return -EINVAL;
	}

	if (attrs[TIPC_NLA_BEARER_PROP]) {
		struct nlattr *props[TIPC_NLA_PROP_MAX + 1];

		err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
					      props);
		if (err) {
			rtnl_unlock();
			return err;
		}

		if (props[TIPC_NLA_PROP_TOL])
			b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
		if (props[TIPC_NLA_PROP_PRIO])
			b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
		if (props[TIPC_NLA_PROP_WIN])
			b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
	}
	rtnl_unlock();

	return 0;
}
880

881
static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
882
			       struct tipc_media *media, int nlflags)
883
884
885
886
887
{
	void *hdr;
	struct nlattr *attrs;
	struct nlattr *prop;

888
	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
889
			  nlflags, TIPC_NL_MEDIA_GET);
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
	if (!hdr)
		return -EMSGSIZE;

	attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
	if (!attrs)
		goto msg_full;

	if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
		goto attr_msg_full;

	prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
	if (!prop)
		goto prop_msg_full;
	if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
		goto prop_msg_full;
	if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
		goto prop_msg_full;
	if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
		goto prop_msg_full;

	nla_nest_end(msg->skb, prop);
	nla_nest_end(msg->skb, attrs);
	genlmsg_end(msg->skb, hdr);

	return 0;

prop_msg_full:
	nla_nest_cancel(msg->skb, prop);
attr_msg_full:
	nla_nest_cancel(msg->skb, attrs);
msg_full:
	genlmsg_cancel(msg->skb, hdr);

	return -EMSGSIZE;
}

int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	int err;
	int i = cb->args[0];
	struct tipc_nl_msg msg;

	if (i == MAX_MEDIA)
		return 0;

	msg.skb = skb;
	msg.portid = NETLINK_CB(cb->skb).portid;
	msg.seq = cb->nlh->nlmsg_seq;

	rtnl_lock();
	for (; media_info_array[i] != NULL; i++) {
941
942
		err = __tipc_nl_add_media(&msg, media_info_array[i],
					  NLM_F_MULTI);
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
979
980
981
982
983
984
985
986
987
988
		if (err)
			break;
	}
	rtnl_unlock();

	cb->args[0] = i;
	return skb->len;
}

int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
{
	int err;
	char *name;
	struct tipc_nl_msg msg;
	struct tipc_media *media;
	struct sk_buff *rep;
	struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];

	if (!info->attrs[TIPC_NLA_MEDIA])
		return -EINVAL;

	err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
			       info->attrs[TIPC_NLA_MEDIA],
			       tipc_nl_media_policy);
	if (err)
		return err;

	if (!attrs[TIPC_NLA_MEDIA_NAME])
		return -EINVAL;
	name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);

	rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!rep)
		return -ENOMEM;

	msg.skb = rep;
	msg.portid = info->snd_portid;
	msg.seq = info->snd_seq;

	rtnl_lock();
	media = tipc_media_find(name);
	if (!media) {
		err = -EINVAL;
		goto err_out;
	}

989
	err = __tipc_nl_add_media(&msg, media, 0);
990
991
992
993
994
995
996
997
998
999
1000
	if (err)
		goto err_out;
	rtnl_unlock();

	return genlmsg_reply(rep, info);
err_out:
	rtnl_unlock();
	nlmsg_free(rep);

	return err;
}
1001
1002
1003
1004
1005
1006
1007
1008
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

int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
{
	int err;
	char *name;
	struct tipc_media *m;
	struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];

	if (!info->attrs[TIPC_NLA_MEDIA])
		return -EINVAL;

	err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
			       info->attrs[TIPC_NLA_MEDIA],
			       tipc_nl_media_policy);

	if (!attrs[TIPC_NLA_MEDIA_NAME])
		return -EINVAL;
	name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);

	rtnl_lock();
	m = tipc_media_find(name);
	if (!m) {
		rtnl_unlock();
		return -EINVAL;
	}

	if (attrs[TIPC_NLA_MEDIA_PROP]) {
		struct nlattr *props[TIPC_NLA_PROP_MAX + 1];

		err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
					      props);
		if (err) {
			rtnl_unlock();
			return err;
		}

		if (props[TIPC_NLA_PROP_TOL])
			m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
		if (props[TIPC_NLA_PROP_PRIO])
			m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
		if (props[TIPC_NLA_PROP_WIN])
			m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
	}
	rtnl_unlock();

	return 0;
}