bearer.c 25.9 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
198
		tipc_disc_add_dest(b_ptr->link_req);
	rcu_read_unlock();
Per Liden's avatar
Per Liden committed
199
200
}

201
void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
Per Liden's avatar
Per Liden committed
202
{
203
	struct tipc_net *tn = net_generic(net, tipc_net_id);
204
205
206
	struct tipc_bearer *b_ptr;

	rcu_read_lock();
207
	b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
208
	if (b_ptr)
209
210
		tipc_disc_remove_dest(b_ptr->link_req);
	rcu_read_unlock();
Per Liden's avatar
Per Liden committed
211
212
213
214
}

/**
 * tipc_enable_bearer - enable bearer with the given name
215
 */
216
static int tipc_enable_bearer(struct net *net, const char *name,
Erik Hugne's avatar
Erik Hugne committed
217
218
			      u32 disc_domain, u32 priority,
			      struct nlattr *attr[])
Per Liden's avatar
Per Liden committed
219
{
220
	struct tipc_net *tn = net_generic(net, tipc_net_id);
221
	struct tipc_bearer *b_ptr;
222
	struct tipc_media *m_ptr;
223
	struct tipc_bearer_names b_names;
Per Liden's avatar
Per Liden committed
224
225
226
227
228
229
	char addr_string[16];
	u32 bearer_id;
	u32 with_this_prio;
	u32 i;
	int res = -EINVAL;

230
	if (!tn->own_addr) {
231
232
		pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
			name);
Per Liden's avatar
Per Liden committed
233
		return -ENOPROTOOPT;
234
	}
235
	if (!bearer_name_validate(name, &b_names)) {
236
		pr_warn("Bearer <%s> rejected, illegal name\n", name);
237
		return -EINVAL;
238
	}
239
	if (tipc_addr_domain_valid(disc_domain) &&
240
241
242
	    (disc_domain != tn->own_addr)) {
		if (tipc_in_scope(disc_domain, tn->own_addr)) {
			disc_domain = tn->own_addr & TIPC_CLUSTER_MASK;
243
			res = 0;   /* accept any node in own cluster */
244
		} else if (in_own_cluster_exact(net, disc_domain))
245
246
247
			res = 0;   /* accept specified node in own cluster */
	}
	if (res) {
248
249
		pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
			name);
250
251
		return -EINVAL;
	}
252
	if ((priority > TIPC_MAX_LINK_PRI) &&
253
	    (priority != TIPC_MEDIA_LINK_PRI)) {
254
		pr_warn("Bearer <%s> rejected, illegal priority\n", name);
Per Liden's avatar
Per Liden committed
255
		return -EINVAL;
256
	}
Per Liden's avatar
Per Liden committed
257

258
	m_ptr = tipc_media_find(b_names.media_name);
Per Liden's avatar
Per Liden committed
259
	if (!m_ptr) {
260
261
		pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
			name, b_names.media_name);
Ying Xue's avatar
Ying Xue committed
262
		return -EINVAL;
Per Liden's avatar
Per Liden committed
263
	}
264
265

	if (priority == TIPC_MEDIA_LINK_PRI)
Per Liden's avatar
Per Liden committed
266
267
268
269
270
271
		priority = m_ptr->priority;

restart:
	bearer_id = MAX_BEARERS;
	with_this_prio = 1;
	for (i = MAX_BEARERS; i-- != 0; ) {
272
		b_ptr = rtnl_dereference(tn->bearer_list[i]);
273
		if (!b_ptr) {
Per Liden's avatar
Per Liden committed
274
275
276
			bearer_id = i;
			continue;
		}
277
		if (!strcmp(name, b_ptr->name)) {
278
279
			pr_warn("Bearer <%s> rejected, already enabled\n",
				name);
Ying Xue's avatar
Ying Xue committed
280
			return -EINVAL;
Per Liden's avatar
Per Liden committed
281
		}
282
		if ((b_ptr->priority == priority) &&
Per Liden's avatar
Per Liden committed
283
284
		    (++with_this_prio > 2)) {
			if (priority-- == 0) {
285
286
				pr_warn("Bearer <%s> rejected, duplicate priority\n",
					name);
Ying Xue's avatar
Ying Xue committed
287
				return -EINVAL;
Per Liden's avatar
Per Liden committed
288
			}
289
290
			pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
				name, priority + 1, priority);
Per Liden's avatar
Per Liden committed
291
292
293
294
			goto restart;
		}
	}
	if (bearer_id >= MAX_BEARERS) {
295
296
		pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
			name, MAX_BEARERS);
Ying Xue's avatar
Ying Xue committed
297
		return -EINVAL;
Per Liden's avatar
Per Liden committed
298
299
	}

300
	b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
Ying Xue's avatar
Ying Xue committed
301
302
303
	if (!b_ptr)
		return -ENOMEM;

304
	strcpy(b_ptr->name, name);
305
	b_ptr->media = m_ptr;
Erik Hugne's avatar
Erik Hugne committed
306
	res = m_ptr->enable_media(net, b_ptr, attr);
Per Liden's avatar
Per Liden committed
307
	if (res) {
308
309
		pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
			name, -res);
Ying Xue's avatar
Ying Xue committed
310
		return -EINVAL;
Per Liden's avatar
Per Liden committed
311
312
313
	}

	b_ptr->identity = bearer_id;
314
315
	b_ptr->tolerance = m_ptr->tolerance;
	b_ptr->window = m_ptr->window;
316
	b_ptr->domain = disc_domain;
Per Liden's avatar
Per Liden committed
317
318
	b_ptr->net_plane = bearer_id + 'A';
	b_ptr->priority = priority;
319

320
	res = tipc_disc_create(net, b_ptr, &b_ptr->bcast_addr);
321
	if (res) {
322
		bearer_disable(net, b_ptr);
323
324
		pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
			name);
Ying Xue's avatar
Ying Xue committed
325
		return -EINVAL;
326
	}
327

328
	rcu_assign_pointer(tn->bearer_list[bearer_id], b_ptr);
329

330
331
332
	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
333
334
335
336
	return res;
}

/**
337
 * tipc_reset_bearer - Reset all links established over this bearer
Per Liden's avatar
Per Liden committed
338
 */
339
static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b_ptr)
Per Liden's avatar
Per Liden committed
340
{
341
	pr_info("Resetting bearer <%s>\n", b_ptr->name);
342
	tipc_node_delete_links(net, b_ptr->identity);
343
	tipc_disc_reset(net, b_ptr);
344
	return 0;
Per Liden's avatar
Per Liden committed
345
346
347
}

/**
348
 * bearer_disable
349
 *
Ying Xue's avatar
Ying Xue committed
350
 * Note: This routine assumes caller holds RTNL lock.
Per Liden's avatar
Per Liden committed
351
 */
352
static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr)
Per Liden's avatar
Per Liden committed
353
{
354
	struct tipc_net *tn = net_generic(net, tipc_net_id);
355
356
	u32 i;

357
	pr_info("Disabling bearer <%s>\n", b_ptr->name);
358
	b_ptr->media->disable_media(b_ptr);
359

360
	tipc_node_delete_links(net, b_ptr->identity);
361
	RCU_INIT_POINTER(b_ptr->media_ptr, NULL);
362
363
	if (b_ptr->link_req)
		tipc_disc_delete(b_ptr->link_req);
364
365

	for (i = 0; i < MAX_BEARERS; i++) {
366
367
		if (b_ptr == rtnl_dereference(tn->bearer_list[i])) {
			RCU_INIT_POINTER(tn->bearer_list[i], NULL);
368
369
370
			break;
		}
	}
371
	kfree_rcu(b_ptr, rcu);
Per Liden's avatar
Per Liden committed
372
373
}

Erik Hugne's avatar
Erik Hugne committed
374
375
int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
			 struct nlattr *attr[])
376
377
378
379
380
{
	struct net_device *dev;
	char *driver_name = strchr((const char *)b->name, ':') + 1;

	/* Find device with specified name */
381
	dev = dev_get_by_name(net, driver_name);
382
383
384
	if (!dev)
		return -ENODEV;

385
	/* Associate TIPC bearer with L2 bearer */
386
	rcu_assign_pointer(b->media_ptr, dev);
387
	memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
388
389
390
391
	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;
392
	b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
393
394
395
396
	rcu_assign_pointer(dev->tipc_ptr, b);
	return 0;
}

397
/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
398
 *
399
 * Mark L2 bearer as inactive so that incoming buffers are thrown away
400
401
402
 */
void tipc_disable_l2_media(struct tipc_bearer *b)
{
403
404
405
	struct net_device *dev;

	dev = (struct net_device *)rtnl_dereference(b->media_ptr);
406
	RCU_INIT_POINTER(dev->tipc_ptr, NULL);
407
	synchronize_net();
408
409
410
411
	dev_put(dev);
}

/**
412
 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
413
 * @buf: the packet to be sent
stephen hemminger's avatar
stephen hemminger committed
414
 * @b_ptr: the bearer through which the packet is to be sent
415
416
 * @dest: peer destination address
 */
417
418
int tipc_l2_send_msg(struct net *net, struct sk_buff *buf,
		     struct tipc_bearer *b, struct tipc_media_addr *dest)
419
420
{
	struct sk_buff *clone;
421
	struct net_device *dev;
422
	int delta;
423
424
425
426

	dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
	if (!dev)
		return 0;
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453

	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!
 */
454
void tipc_bearer_send(struct net *net, u32 bearer_id, struct sk_buff *buf,
455
456
		      struct tipc_media_addr *dest)
{
457
	struct tipc_net *tn = net_generic(net, tipc_net_id);
458
459
460
	struct tipc_bearer *b_ptr;

	rcu_read_lock();
461
	b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
462
	if (likely(b_ptr))
463
		b_ptr->media->send_msg(net, buf, b_ptr, dest);
464
	rcu_read_unlock();
465
466
}

467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
/* 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);
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
			/* Until we remove cloning in tipc_l2_send_msg(): */
			kfree_skb(skb);
		}
	}
	rcu_read_unlock();
}

/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
 */
void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
			 struct sk_buff_head *xmitq)
{
	struct tipc_net *tn = tipc_net(net);
	int net_id = tn->net_id;
	struct tipc_bearer *b;
	struct sk_buff *skb, *tmp;
	struct tipc_msg *hdr;

	rcu_read_lock();
	b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
	if (likely(b)) {
		skb_queue_walk_safe(xmitq, skb, tmp) {
			hdr = buf_msg(skb);
			msg_set_non_seq(hdr, 1);
			msg_set_mc_netid(hdr, net_id);
			__skb_dequeue(xmitq);
			b->media->send_msg(net, skb, b, &b->bcast_addr);
513
514
515
516
517
518
519
			/* Until we remove cloning in tipc_l2_send_msg(): */
			kfree_skb(skb);
		}
	}
	rcu_read_unlock();
}

520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
/**
 * 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();
537
	b_ptr = rcu_dereference_rtnl(dev->tipc_ptr);
538
539
540
	if (likely(b_ptr)) {
		if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
			buf->next = NULL;
541
			tipc_rcv(dev_net(dev), buf, b_ptr);
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
			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);
565
566
	struct net *net = dev_net(dev);
	struct tipc_bearer *b_ptr;
567

568
569
	b_ptr = rtnl_dereference(dev->tipc_ptr);
	if (!b_ptr)
570
571
572
573
574
575
576
577
		return NOTIFY_DONE;

	b_ptr->mtu = dev->mtu;

	switch (evt) {
	case NETDEV_CHANGE:
		if (netif_carrier_ok(dev))
			break;
578
	case NETDEV_GOING_DOWN:
579
	case NETDEV_CHANGEMTU:
580
		tipc_reset_bearer(net, b_ptr);
581
		break;
582
	case NETDEV_CHANGEADDR:
583
		b_ptr->media->raw2addr(b_ptr, &b_ptr->addr,
584
				       (char *)dev->dev_addr);
585
		tipc_reset_bearer(net, b_ptr);
586
587
588
		break;
	case NETDEV_UNREGISTER:
	case NETDEV_CHANGENAME:
589
		bearer_disable(dev_net(dev), b_ptr);
590
591
592
593
594
595
		break;
	}
	return NOTIFY_OK;
}

static struct packet_type tipc_packet_type __read_mostly = {
596
	.type = htons(ETH_P_TIPC),
597
598
599
600
601
602
603
604
605
606
	.func = tipc_l2_rcv_msg,
};

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

int tipc_bearer_setup(void)
{
607
608
609
610
611
	int err;

	err = register_netdevice_notifier(&notifier);
	if (err)
		return err;
612
	dev_add_pack(&tipc_packet_type);
613
	return 0;
614
615
616
617
618
619
620
}

void tipc_bearer_cleanup(void)
{
	unregister_netdevice_notifier(&notifier);
	dev_remove_pack(&tipc_packet_type);
}
Per Liden's avatar
Per Liden committed
621

622
void tipc_bearer_stop(struct net *net)
Per Liden's avatar
Per Liden committed
623
{
624
	struct tipc_net *tn = net_generic(net, tipc_net_id);
625
	struct tipc_bearer *b_ptr;
Per Liden's avatar
Per Liden committed
626
627
628
	u32 i;

	for (i = 0; i < MAX_BEARERS; i++) {
629
		b_ptr = rtnl_dereference(tn->bearer_list[i]);
630
		if (b_ptr) {
631
			bearer_disable(net, b_ptr);
632
			tn->bearer_list[i] = NULL;
633
		}
Per Liden's avatar
Per Liden committed
634
635
	}
}
636

637
/* Caller should hold rtnl_lock to protect the bearer */
638
static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
639
				struct tipc_bearer *bearer, int nlflags)
640
641
642
643
644
{
	void *hdr;
	struct nlattr *attrs;
	struct nlattr *prop;

645
	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
646
			  nlflags, TIPC_NL_BEARER_GET);
647
648
649
650
651
652
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
	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;
689
690
	struct net *net = sock_net(skb->sk);
	struct tipc_net *tn = net_generic(net, tipc_net_id);
691
692
693
694
695
696
697
698
699
700

	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++) {
701
		bearer = rtnl_dereference(tn->bearer_list[i]);
702
703
704
		if (!bearer)
			continue;

705
		err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
		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];
723
	struct net *net = genl_info_net(info);
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746

	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();
747
	bearer = tipc_bearer_find(net, name);
748
749
750
751
752
	if (!bearer) {
		err = -EINVAL;
		goto err_out;
	}

753
	err = __tipc_nl_add_bearer(&msg, bearer, 0);
754
755
756
757
758
759
760
761
762
763
764
765
	if (err)
		goto err_out;
	rtnl_unlock();

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

	return err;
}

766
767
768
769
770
771
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];
772
	struct net *net = sock_net(skb->sk);
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788

	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();
789
	bearer = tipc_bearer_find(net, name);
790
791
792
793
794
	if (!bearer) {
		rtnl_unlock();
		return -EINVAL;
	}

795
	bearer_disable(net, bearer);
796
797
798
799
800
801
802
803
804
805
	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];
806
807
	struct net *net = sock_net(skb->sk);
	struct tipc_net *tn = net_generic(net, tipc_net_id);
808
809
810
811
	u32 domain;
	u32 prio;

	prio = TIPC_MEDIA_LINK_PRI;
812
	domain = tn->own_addr & TIPC_CLUSTER_MASK;
813
814
815
816
817
818
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

	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
844
	err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
845
846
847
848
849
850
851
852
	if (err) {
		rtnl_unlock();
		return err;
	}
	rtnl_unlock();

	return 0;
}
853
854
855
856
857
858
859

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];
860
	struct net *net = sock_net(skb->sk);
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875

	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();
876
	b = tipc_bearer_find(net, name);
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
	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;
}
903

904
static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
905
			       struct tipc_media *media, int nlflags)
906
907
908
909
910
{
	void *hdr;
	struct nlattr *attrs;
	struct nlattr *prop;

911
	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
912
			  nlflags, TIPC_NL_MEDIA_GET);
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
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
	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++) {
964
965
		err = __tipc_nl_add_media(&msg, media_info_array[i],
					  NLM_F_MULTI);
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
		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;
	}

1012
	err = __tipc_nl_add_media(&msg, media, 0);
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
	if (err)
		goto err_out;
	rtnl_unlock();

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

	return err;
}
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

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;
}