bearer.c 25.6 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, 2013-2016, 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 "monitor.h"
43
#include "bcast.h"
44
#include "netlink.h"
Per Liden's avatar
Per Liden committed
45

46
#define MAX_ADDR_STR 60
Per Liden's avatar
Per Liden committed
47

48
static struct tipc_media * const media_info_array[] = {
49
50
51
	&eth_media_info,
#ifdef CONFIG_TIPC_MEDIA_IB
	&ib_media_info,
Erik Hugne's avatar
Erik Hugne committed
52
53
54
#endif
#ifdef CONFIG_TIPC_MEDIA_UDP
	&udp_media_info,
55
56
57
#endif
	NULL
};
Per Liden's avatar
Per Liden committed
58

59
static void bearer_disable(struct net *net, struct tipc_bearer *b);
60

Per Liden's avatar
Per Liden committed
61
/**
62
 * tipc_media_find - locates specified media object by name
Per Liden's avatar
Per Liden committed
63
 */
64
struct tipc_media *tipc_media_find(const char *name)
Per Liden's avatar
Per Liden committed
65
66
67
{
	u32 i;

68
69
	for (i = 0; media_info_array[i] != NULL; i++) {
		if (!strcmp(media_info_array[i]->name, name))
70
			break;
Per Liden's avatar
Per Liden committed
71
	}
72
	return media_info_array[i];
Per Liden's avatar
Per Liden committed
73
74
}

75
76
77
/**
 * media_find_id - locates specified media object by type identifier
 */
78
static struct tipc_media *media_find_id(u8 type)
79
80
81
{
	u32 i;

82
83
	for (i = 0; media_info_array[i] != NULL; i++) {
		if (media_info_array[i]->type_id == type)
84
			break;
85
	}
86
	return media_info_array[i];
Per Liden's avatar
Per Liden committed
87
88
89
}

/**
90
 * tipc_media_addr_printf - record media address in print buffer
Per Liden's avatar
Per Liden committed
91
 */
92
void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
Per Liden's avatar
Per Liden committed
93
{
94
	char addr_str[MAX_ADDR_STR];
95
	struct tipc_media *m;
96
	int ret;
Per Liden's avatar
Per Liden committed
97

98
	m = media_find_id(a->media_id);
Per Liden's avatar
Per Liden committed
99

100
101
	if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
		ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
102
103
	else {
		u32 i;
Per Liden's avatar
Per Liden committed
104

Richard Alpe's avatar
Richard Alpe committed
105
		ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
106
		for (i = 0; i < sizeof(a->value); i++)
Richard Alpe's avatar
Richard Alpe committed
107
			ret += scnprintf(buf - ret, len + ret,
108
					    "-%02x", a->value[i]);
Per Liden's avatar
Per Liden committed
109
110
111
112
113
	}
}

/**
 * bearer_name_validate - validate & (optionally) deconstruct bearer name
114
115
 * @name: ptr to bearer name string
 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
116
 *
Per Liden's avatar
Per Liden committed
117
118
 * Returns 1 if bearer name is valid, otherwise 0.
 */
119
static int bearer_name_validate(const char *name,
120
				struct tipc_bearer_names *name_parts)
Per Liden's avatar
Per Liden committed
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
{
	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;
137
138
	if_name = strchr(media_name, ':');
	if (if_name == NULL)
Per Liden's avatar
Per Liden committed
139
140
141
142
143
144
		return 0;
	*(if_name++) = 0;
	media_len = if_name - media_name;
	if_len = strlen(if_name) + 1;

	/* validate component parts of bearer name */
145
	if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
146
	    (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
Per Liden's avatar
Per Liden committed
147
148
149
150
151
152
153
154
155
156
157
		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;
}

/**
158
 * tipc_bearer_find - locates bearer object with matching bearer name
Per Liden's avatar
Per Liden committed
159
 */
160
struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
Per Liden's avatar
Per Liden committed
161
{
162
	struct tipc_net *tn = net_generic(net, tipc_net_id);
163
	struct tipc_bearer *b;
Per Liden's avatar
Per Liden committed
164
165
	u32 i;

166
	for (i = 0; i < MAX_BEARERS; i++) {
167
168
169
		b = rtnl_dereference(tn->bearer_list[i]);
		if (b && (!strcmp(b->name, name)))
			return b;
Per Liden's avatar
Per Liden committed
170
	}
171
	return NULL;
Per Liden's avatar
Per Liden committed
172
173
}

174
void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
Per Liden's avatar
Per Liden committed
175
{
176
	struct tipc_net *tn = net_generic(net, tipc_net_id);
177
	struct tipc_bearer *b;
178
179

	rcu_read_lock();
180
181
182
	b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
	if (b)
		tipc_disc_add_dest(b->link_req);
183
	rcu_read_unlock();
Per Liden's avatar
Per Liden committed
184
185
}

186
void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
Per Liden's avatar
Per Liden committed
187
{
188
	struct tipc_net *tn = net_generic(net, tipc_net_id);
189
	struct tipc_bearer *b;
190
191

	rcu_read_lock();
192
193
194
	b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
	if (b)
		tipc_disc_remove_dest(b->link_req);
195
	rcu_read_unlock();
Per Liden's avatar
Per Liden committed
196
197
198
199
}

/**
 * tipc_enable_bearer - enable bearer with the given name
200
 */
201
static int tipc_enable_bearer(struct net *net, const char *name,
Erik Hugne's avatar
Erik Hugne committed
202
203
			      u32 disc_domain, u32 priority,
			      struct nlattr *attr[])
Per Liden's avatar
Per Liden committed
204
{
205
	struct tipc_net *tn = net_generic(net, tipc_net_id);
206
207
	struct tipc_bearer *b;
	struct tipc_media *m;
208
	struct tipc_bearer_names b_names;
209
	struct sk_buff *skb;
Per Liden's avatar
Per Liden committed
210
211
212
213
214
215
	char addr_string[16];
	u32 bearer_id;
	u32 with_this_prio;
	u32 i;
	int res = -EINVAL;

216
	if (!tn->own_addr) {
217
218
		pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
			name);
Per Liden's avatar
Per Liden committed
219
		return -ENOPROTOOPT;
220
	}
221
	if (!bearer_name_validate(name, &b_names)) {
222
		pr_warn("Bearer <%s> rejected, illegal name\n", name);
223
		return -EINVAL;
224
	}
225
	if (tipc_addr_domain_valid(disc_domain) &&
226
227
228
	    (disc_domain != tn->own_addr)) {
		if (tipc_in_scope(disc_domain, tn->own_addr)) {
			disc_domain = tn->own_addr & TIPC_CLUSTER_MASK;
229
			res = 0;   /* accept any node in own cluster */
230
		} else if (in_own_cluster_exact(net, disc_domain))
231
232
233
			res = 0;   /* accept specified node in own cluster */
	}
	if (res) {
234
235
		pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
			name);
236
237
		return -EINVAL;
	}
238
	if ((priority > TIPC_MAX_LINK_PRI) &&
239
	    (priority != TIPC_MEDIA_LINK_PRI)) {
240
		pr_warn("Bearer <%s> rejected, illegal priority\n", name);
Per Liden's avatar
Per Liden committed
241
		return -EINVAL;
242
	}
Per Liden's avatar
Per Liden committed
243

244
245
	m = tipc_media_find(b_names.media_name);
	if (!m) {
246
247
		pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
			name, b_names.media_name);
Ying Xue's avatar
Ying Xue committed
248
		return -EINVAL;
Per Liden's avatar
Per Liden committed
249
	}
250
251

	if (priority == TIPC_MEDIA_LINK_PRI)
252
		priority = m->priority;
Per Liden's avatar
Per Liden committed
253
254
255
256
257

restart:
	bearer_id = MAX_BEARERS;
	with_this_prio = 1;
	for (i = MAX_BEARERS; i-- != 0; ) {
258
259
		b = rtnl_dereference(tn->bearer_list[i]);
		if (!b) {
Per Liden's avatar
Per Liden committed
260
261
262
			bearer_id = i;
			continue;
		}
263
		if (!strcmp(name, b->name)) {
264
265
			pr_warn("Bearer <%s> rejected, already enabled\n",
				name);
Ying Xue's avatar
Ying Xue committed
266
			return -EINVAL;
Per Liden's avatar
Per Liden committed
267
		}
268
		if ((b->priority == priority) &&
Per Liden's avatar
Per Liden committed
269
270
		    (++with_this_prio > 2)) {
			if (priority-- == 0) {
271
272
				pr_warn("Bearer <%s> rejected, duplicate priority\n",
					name);
Ying Xue's avatar
Ying Xue committed
273
				return -EINVAL;
Per Liden's avatar
Per Liden committed
274
			}
275
276
			pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
				name, priority + 1, priority);
Per Liden's avatar
Per Liden committed
277
278
279
280
			goto restart;
		}
	}
	if (bearer_id >= MAX_BEARERS) {
281
282
		pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
			name, MAX_BEARERS);
Ying Xue's avatar
Ying Xue committed
283
		return -EINVAL;
Per Liden's avatar
Per Liden committed
284
285
	}

286
287
	b = kzalloc(sizeof(*b), GFP_ATOMIC);
	if (!b)
Ying Xue's avatar
Ying Xue committed
288
289
		return -ENOMEM;

290
291
292
	strcpy(b->name, name);
	b->media = m;
	res = m->enable_media(net, b, attr);
Per Liden's avatar
Per Liden committed
293
	if (res) {
294
295
		pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
			name, -res);
Ying Xue's avatar
Ying Xue committed
296
		return -EINVAL;
Per Liden's avatar
Per Liden committed
297
298
	}

299
300
301
302
303
304
	b->identity = bearer_id;
	b->tolerance = m->tolerance;
	b->window = m->window;
	b->domain = disc_domain;
	b->net_plane = bearer_id + 'A';
	b->priority = priority;
305

306
	res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
307
	if (res) {
308
		bearer_disable(net, b);
309
310
		pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
			name);
Ying Xue's avatar
Ying Xue committed
311
		return -EINVAL;
312
	}
313

314
	rcu_assign_pointer(tn->bearer_list[bearer_id], b);
315
316
	if (skb)
		tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
317
318
319
320

	if (tipc_mon_create(net, bearer_id))
		return -ENOMEM;

321
322
323
	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
324
325
326
327
	return res;
}

/**
328
 * tipc_reset_bearer - Reset all links established over this bearer
Per Liden's avatar
Per Liden committed
329
 */
330
static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
Per Liden's avatar
Per Liden committed
331
{
332
333
334
	pr_info("Resetting bearer <%s>\n", b->name);
	tipc_node_delete_links(net, b->identity);
	tipc_disc_reset(net, b);
335
	return 0;
Per Liden's avatar
Per Liden committed
336
337
338
}

/**
339
 * bearer_disable
340
 *
Ying Xue's avatar
Ying Xue committed
341
 * Note: This routine assumes caller holds RTNL lock.
Per Liden's avatar
Per Liden committed
342
 */
343
static void bearer_disable(struct net *net, struct tipc_bearer *b)
Per Liden's avatar
Per Liden committed
344
{
345
346
	struct tipc_net *tn = tipc_net(net);
	int bearer_id = b->identity;
347

348
349
	pr_info("Disabling bearer <%s>\n", b->name);
	b->media->disable_media(b);
350
	tipc_node_delete_links(net, bearer_id);
351
352
353
	RCU_INIT_POINTER(b->media_ptr, NULL);
	if (b->link_req)
		tipc_disc_delete(b->link_req);
354
	RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
355
	kfree_rcu(b, rcu);
356
	tipc_mon_delete(net, bearer_id);
Per Liden's avatar
Per Liden committed
357
358
}

Erik Hugne's avatar
Erik Hugne committed
359
360
int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
			 struct nlattr *attr[])
361
362
363
364
365
{
	struct net_device *dev;
	char *driver_name = strchr((const char *)b->name, ':') + 1;

	/* Find device with specified name */
366
	dev = dev_get_by_name(net, driver_name);
367
368
369
	if (!dev)
		return -ENODEV;

370
	/* Associate TIPC bearer with L2 bearer */
371
	rcu_assign_pointer(b->media_ptr, dev);
372
	memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
373
374
375
376
	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;
377
	b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
378
379
380
381
	rcu_assign_pointer(dev->tipc_ptr, b);
	return 0;
}

382
/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
383
 *
384
 * Mark L2 bearer as inactive so that incoming buffers are thrown away
385
386
387
 */
void tipc_disable_l2_media(struct tipc_bearer *b)
{
388
389
390
	struct net_device *dev;

	dev = (struct net_device *)rtnl_dereference(b->media_ptr);
391
	RCU_INIT_POINTER(dev->tipc_ptr, NULL);
392
	synchronize_net();
393
394
395
396
	dev_put(dev);
}

/**
397
 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
398
 * @skb: the packet to be sent
399
 * @b: the bearer through which the packet is to be sent
400
401
 * @dest: peer destination address
 */
402
int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
403
		     struct tipc_bearer *b, struct tipc_media_addr *dest)
404
{
405
	struct net_device *dev;
406
	int delta;
407
	void *tipc_ptr;
408
409
410
411

	dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
	if (!dev)
		return 0;
412

413
414
415
416
417
	/* Send RESET message even if bearer is detached from device */
	tipc_ptr = rtnl_dereference(dev->tipc_ptr);
	if (unlikely(!tipc_ptr && !msg_is_reset(buf_msg(skb))))
		goto drop;

418
	delta = dev->hard_header_len - skb_headroom(skb);
419
	if ((delta > 0) &&
420
421
	    pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC))
		goto drop;
422

423
424
425
426
427
428
	skb_reset_network_header(skb);
	skb->dev = dev;
	skb->protocol = htons(ETH_P_TIPC);
	dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
			dev->dev_addr, skb->len);
	dev_queue_xmit(skb);
429
	return 0;
430
431
432
drop:
	kfree_skb(skb);
	return 0;
433
434
}

435
436
437
438
439
440
441
442
443
444
445
446
447
int tipc_bearer_mtu(struct net *net, u32 bearer_id)
{
	int mtu = 0;
	struct tipc_bearer *b;

	rcu_read_lock();
	b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
	if (b)
		mtu = b->mtu;
	rcu_read_unlock();
	return mtu;
}

448
449
450
451
452
453
454
455
456
457
458
459
460
/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
 */
void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
			  struct sk_buff *skb,
			  struct tipc_media_addr *dest)
{
	struct tipc_net *tn = tipc_net(net);
	struct tipc_bearer *b;

	rcu_read_lock();
	b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
	if (likely(b))
		b->media->send_msg(net, skb, b, dest);
461
462
	else
		kfree_skb(skb);
463
464
465
	rcu_read_unlock();
}

466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
/* 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]);
481
482
483
484
485
	if (unlikely(!b))
		__skb_queue_purge(xmitq);
	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
	}
	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]);
503
504
505
506
507
508
509
510
	if (unlikely(!b))
		__skb_queue_purge(xmitq);
	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);
511
512
513
514
	}
	rcu_read_unlock();
}

515
516
517
518
519
520
521
522
523
524
525
/**
 * 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).
 */
526
static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
527
528
			   struct packet_type *pt, struct net_device *orig_dev)
{
529
	struct tipc_bearer *b;
530
531

	rcu_read_lock();
532
	b = rcu_dereference_rtnl(dev->tipc_ptr);
533
534
535
536
537
	if (likely(b && (skb->pkt_type <= PACKET_BROADCAST))) {
		skb->next = NULL;
		tipc_rcv(dev_net(dev), skb, b);
		rcu_read_unlock();
		return NET_RX_SUCCESS;
538
539
	}
	rcu_read_unlock();
540
	kfree_skb(skb);
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
	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);
557
	struct net *net = dev_net(dev);
558
	struct tipc_net *tn = tipc_net(net);
559
	struct tipc_bearer *b;
560
	int i;
561

562
	b = rtnl_dereference(dev->tipc_ptr);
563
564
565
566
567
568
569
	if (!b) {
		for (i = 0; i < MAX_BEARERS; b = NULL, i++) {
			b = rtnl_dereference(tn->bearer_list[i]);
			if (b && (b->media_ptr == dev))
				break;
		}
	}
570
	if (!b)
571
572
		return NOTIFY_DONE;

573
	b->mtu = dev->mtu;
574
575
576
577
578

	switch (evt) {
	case NETDEV_CHANGE:
		if (netif_carrier_ok(dev))
			break;
579
580
581
	case NETDEV_UP:
		rcu_assign_pointer(dev->tipc_ptr, b);
		break;
582
	case NETDEV_GOING_DOWN:
583
584
585
586
		RCU_INIT_POINTER(dev->tipc_ptr, NULL);
		synchronize_net();
		tipc_reset_bearer(net, b);
		break;
587
	case NETDEV_CHANGEMTU:
588
		tipc_reset_bearer(net, b);
589
		break;
590
	case NETDEV_CHANGEADDR:
591
		b->media->raw2addr(b, &b->addr,
592
				   (char *)dev->dev_addr);
593
		tipc_reset_bearer(net, b);
594
595
596
		break;
	case NETDEV_UNREGISTER:
	case NETDEV_CHANGENAME:
597
		bearer_disable(dev_net(dev), b);
598
599
600
601
602
603
		break;
	}
	return NOTIFY_OK;
}

static struct packet_type tipc_packet_type __read_mostly = {
604
	.type = htons(ETH_P_TIPC),
605
606
607
608
609
610
611
612
613
614
	.func = tipc_l2_rcv_msg,
};

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

int tipc_bearer_setup(void)
{
615
616
617
618
619
	int err;

	err = register_netdevice_notifier(&notifier);
	if (err)
		return err;
620
	dev_add_pack(&tipc_packet_type);
621
	return 0;
622
623
624
625
626
627
628
}

void tipc_bearer_cleanup(void)
{
	unregister_netdevice_notifier(&notifier);
	dev_remove_pack(&tipc_packet_type);
}
Per Liden's avatar
Per Liden committed
629

630
void tipc_bearer_stop(struct net *net)
Per Liden's avatar
Per Liden committed
631
{
632
	struct tipc_net *tn = net_generic(net, tipc_net_id);
633
	struct tipc_bearer *b;
Per Liden's avatar
Per Liden committed
634
635
636
	u32 i;

	for (i = 0; i < MAX_BEARERS; i++) {
637
638
639
		b = rtnl_dereference(tn->bearer_list[i]);
		if (b) {
			bearer_disable(net, b);
640
			tn->bearer_list[i] = NULL;
641
		}
Per Liden's avatar
Per Liden committed
642
643
	}
}
644

645
/* Caller should hold rtnl_lock to protect the bearer */
646
static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
647
				struct tipc_bearer *bearer, int nlflags)
648
649
650
651
652
{
	void *hdr;
	struct nlattr *attrs;
	struct nlattr *prop;

653
	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
654
			  nlflags, TIPC_NL_BEARER_GET);
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
690
691
692
693
694
695
696
	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;
697
698
	struct net *net = sock_net(skb->sk);
	struct tipc_net *tn = net_generic(net, tipc_net_id);
699
700
701
702
703
704
705
706
707
708

	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++) {
709
		bearer = rtnl_dereference(tn->bearer_list[i]);
710
711
712
		if (!bearer)
			continue;

713
		err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
		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];
731
	struct net *net = genl_info_net(info);
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754

	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();
755
	bearer = tipc_bearer_find(net, name);
756
757
758
759
760
	if (!bearer) {
		err = -EINVAL;
		goto err_out;
	}

761
	err = __tipc_nl_add_bearer(&msg, bearer, 0);
762
763
764
765
766
767
768
769
770
771
772
773
	if (err)
		goto err_out;
	rtnl_unlock();

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

	return err;
}

774
775
776
777
778
779
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];
780
	struct net *net = sock_net(skb->sk);
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796

	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();
797
	bearer = tipc_bearer_find(net, name);
798
799
800
801
802
	if (!bearer) {
		rtnl_unlock();
		return -EINVAL;
	}

803
	bearer_disable(net, bearer);
804
805
806
807
808
809
810
811
812
813
	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];
814
815
	struct net *net = sock_net(skb->sk);
	struct tipc_net *tn = net_generic(net, tipc_net_id);
816
817
818
819
	u32 domain;
	u32 prio;

	prio = TIPC_MEDIA_LINK_PRI;
820
	domain = tn->own_addr & TIPC_CLUSTER_MASK;
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

	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
852
	err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
853
854
855
856
857
858
859
860
	if (err) {
		rtnl_unlock();
		return err;
	}
	rtnl_unlock();

	return 0;
}
861
862
863
864
865
866
867

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];
868
	struct net *net = sock_net(skb->sk);
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883

	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();
884
	b = tipc_bearer_find(net, name);
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
	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;
}
911

912
static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
913
			       struct tipc_media *media, int nlflags)
914
915
916
917
918
{
	void *hdr;
	struct nlattr *attrs;
	struct nlattr *prop;

919
	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
920
			  nlflags, TIPC_NL_MEDIA_GET);
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
964
965
966
967
968
969
970
971
	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++) {
972
973
		err = __tipc_nl_add_media(&msg, media_info_array[i],
					  NLM_F_MULTI);
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
1012
1013
1014
1015
1016
1017
1018
1019
		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;
	}

1020
	err = __tipc_nl_add_media(&msg, media, 0);
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
	if (err)
		goto err_out;
	rtnl_unlock();

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

	return err;
}
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
1075
1076
1077
1078

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;
}