aboutsummaryrefslogtreecommitdiffstats
path: root/net/hsr/hsr_netlink.c
blob: 81dac16933fc05a19224a7c9ef450d34dea1be91 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
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
497
498
499
500
501
502
503
/* Copyright 2011-2014 Autronica Fire and Security AS
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * Author(s):
 *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
 *
 * Routines for handling Netlink messages for HSR.
 */

#include "hsr_netlink.h"
#include <linux/kernel.h>
#include <net/rtnetlink.h>
#include <net/genetlink.h>
#include "hsr_main.h"
#include "hsr_device.h"
#include "hsr_framereg.h"

static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = {
	[IFLA_HSR_SLAVE1]		= { .type = NLA_U32 },
	[IFLA_HSR_SLAVE2]		= { .type = NLA_U32 },
	[IFLA_HSR_MULTICAST_SPEC]	= { .type = NLA_U8 },
	[IFLA_HSR_VERSION]	= { .type = NLA_U8 },
	[IFLA_HSR_SUPERVISION_ADDR]	= { .len = ETH_ALEN },
	[IFLA_HSR_SEQ_NR]		= { .type = NLA_U16 },
};


/* Here, it seems a netdevice has already been allocated for us, and the
 * hsr_dev_setup routine has been executed. Nice!
 */
static int hsr_newlink(struct net *src_net, struct net_device *dev,
		       struct nlattr *tb[], struct nlattr *data[])
{
	struct net_device *link[2];
	unsigned char multicast_spec, hsr_version;

	if (!data) {
		netdev_info(dev, "HSR: No slave devices specified\n");
		return -EINVAL;
	}
	if (!data[IFLA_HSR_SLAVE1]) {
		netdev_info(dev, "HSR: Slave1 device not specified\n");
		return -EINVAL;
	}
	link[0] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE1]));
	if (!data[IFLA_HSR_SLAVE2]) {
		netdev_info(dev, "HSR: Slave2 device not specified\n");
		return -EINVAL;
	}
	link[1] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE2]));

	if (!link[0] || !link[1])
		return -ENODEV;
	if (link[0] == link[1])
		return -EINVAL;

	if (!data[IFLA_HSR_MULTICAST_SPEC])
		multicast_spec = 0;
	else
		multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]);

	if (!data[IFLA_HSR_VERSION])
		hsr_version = 0;
	else
		hsr_version = nla_get_u8(data[IFLA_HSR_VERSION]);

	return hsr_dev_finalize(dev, link, multicast_spec, hsr_version);
}

static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
	struct hsr_priv *hsr;
	struct hsr_port *port;
	int res;

	hsr = netdev_priv(dev);

	res = 0;

	rcu_read_lock();
	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
	if (port)
		res = nla_put_u32(skb, IFLA_HSR_SLAVE1, port->dev->ifindex);
	rcu_read_unlock();
	if (res)
		goto nla_put_failure;

	rcu_read_lock();
	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
	if (port)
		res = nla_put_u32(skb, IFLA_HSR_SLAVE2, port->dev->ifindex);
	rcu_read_unlock();
	if (res)
		goto nla_put_failure;

	if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN,
		    hsr->sup_multicast_addr) ||
	    nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr->sequence_nr))
		goto nla_put_failure;

	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static struct rtnl_link_ops hsr_link_ops __read_mostly = {
	.kind		= "hsr",
	.maxtype	= IFLA_HSR_MAX,
	.policy		= hsr_policy,
	.priv_size	= sizeof(struct hsr_priv),
	.setup		= hsr_dev_setup,
	.newlink	= hsr_newlink,
	.fill_info	= hsr_fill_info,
};



/* attribute policy */
static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = {
	[HSR_A_NODE_ADDR] = { .len = ETH_ALEN },
	[HSR_A_NODE_ADDR_B] = { .len = ETH_ALEN },
	[HSR_A_IFINDEX] = { .type = NLA_U32 },
	[HSR_A_IF1_AGE] = { .type = NLA_U32 },
	[HSR_A_IF2_AGE] = { .type = NLA_U32 },
	[HSR_A_IF1_SEQ] = { .type = NLA_U16 },
	[HSR_A_IF2_SEQ] = { .type = NLA_U16 },
};

static struct genl_family hsr_genl_family;

static const struct genl_multicast_group hsr_mcgrps[] = {
	{ .name = "hsr-network", },
};



/* This is called if for some node with MAC address addr, we only get frames
 * over one of the slave interfaces. This would indicate an open network ring
 * (i.e. a link has failed somewhere).
 */
void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN],
		      struct hsr_port *port)
{
	struct sk_buff *skb;
	void *msg_head;
	struct hsr_port *master;
	int res;

	skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!skb)
		goto fail;

	msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_RING_ERROR);
	if (!msg_head)
		goto nla_put_failure;

	res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
	if (res < 0)
		goto nla_put_failure;

	res = nla_put_u32(skb, HSR_A_IFINDEX, port->dev->ifindex);
	if (res < 0)
		goto nla_put_failure;

	genlmsg_end(skb, msg_head);
	genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);

	return;

nla_put_failure:
	kfree_skb(skb);

fail:
	rcu_read_lock();
	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
	netdev_warn(master->dev, "Could not send HSR ring error message\n");
	rcu_read_unlock();
}

/* This is called when we haven't heard from the node with MAC address addr for
 * some time (just before the node is removed from the node table/list).
 */
void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN])
{
	struct sk_buff *skb;
	void *msg_head;
	struct hsr_port *master;
	int res;

	skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!skb)
		goto fail;

	msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN);
	if (!msg_head)
		goto nla_put_failure;


	res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
	if (res < 0)
		goto nla_put_failure;

	genlmsg_end(skb, msg_head);
	genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);

	return;

nla_put_failure:
	kfree_skb(skb);

fail:
	rcu_read_lock();
	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
	netdev_warn(master->dev, "Could not send HSR node down\n");
	rcu_read_unlock();
}


/* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table
 * about the status of a specific node in the network, defined by its MAC
 * address.
 *
 * Input: hsr ifindex, node mac address
 * Output: hsr ifindex, node mac address (copied from request),
 *	   age of latest frame from node over slave 1, slave 2 [ms]
 */
static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
{
	/* For receiving */
	struct nlattr *na;
	struct net_device *hsr_dev;

	/* For sending */
	struct sk_buff *skb_out;
	void *msg_head;
	struct hsr_priv *hsr;
	struct hsr_port *port;
	unsigned char hsr_node_addr_b[ETH_ALEN];
	int hsr_node_if1_age;
	u16 hsr_node_if1_seq;
	int hsr_node_if2_age;
	u16 hsr_node_if2_seq;
	int addr_b_ifindex;
	int res;

	if (!info)
		goto invalid;

	na = info->attrs[HSR_A_IFINDEX];
	if (!na)
		goto invalid;
	na = info->attrs[HSR_A_NODE_ADDR];
	if (!na)
		goto invalid;

	hsr_dev = __dev_get_by_index(genl_info_net(info),
					nla_get_u32(info->attrs[HSR_A_IFINDEX]));
	if (!hsr_dev)
		goto invalid;
	if (!is_hsr_master(hsr_dev))
		goto invalid;


	/* Send reply */

	skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!skb_out) {
		res = -ENOMEM;
		goto fail;
	}

	msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
				info->snd_seq, &hsr_genl_family, 0,
				HSR_C_SET_NODE_STATUS);
	if (!msg_head) {
		res = -ENOMEM;
		goto nla_put_failure;
	}

	res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
	if (res < 0)
		goto nla_put_failure;

	hsr = netdev_priv(hsr_dev);
	res = hsr_get_node_data(hsr,
			(unsigned char *) nla_data(info->attrs[HSR_A_NODE_ADDR]),
			hsr_node_addr_b,
			&addr_b_ifindex,
			&hsr_node_if1_age,
			&hsr_node_if1_seq,
			&hsr_node_if2_age,
			&hsr_node_if2_seq);
	if (res < 0)
		goto nla_put_failure;

	res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN,
					nla_data(info->attrs[HSR_A_NODE_ADDR]));
	if (res < 0)
		goto nla_put_failure;

	if (addr_b_ifindex > -1) {
		res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN,
								hsr_node_addr_b);
		if (res < 0)
			goto nla_put_failure;

		res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX, addr_b_ifindex);
		if (res < 0)
			goto nla_put_failure;
	}

	res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age);
	if (res < 0)
		goto nla_put_failure;
	res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq);
	if (res < 0)
		goto nla_put_failure;
	rcu_read_lock();
	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
	if (port)
		res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
				  port->dev->ifindex);
	rcu_read_unlock();
	if (res < 0)
		goto nla_put_failure;

	res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age);
	if (res < 0)
		goto nla_put_failure;
	res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq);
	if (res < 0)
		goto nla_put_failure;
	rcu_read_lock();
	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
	if (port)
		res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
				  port->dev->ifindex);
	rcu_read_unlock();
	if (res < 0)
		goto nla_put_failure;

	genlmsg_end(skb_out, msg_head);
	genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);

	return 0;

invalid:
	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
	return 0;

nla_put_failure:
	kfree_skb(skb_out);
	/* Fall through */

fail:
	return res;
}

/* Get a list of MacAddressA of all nodes known to this node (including self).
 */
static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
{
	/* For receiving */
	struct nlattr *na;
	struct net_device *hsr_dev;

	/* For sending */
	struct sk_buff *skb_out;
	void *msg_head;
	struct hsr_priv *hsr;
	void *pos;
	unsigned char addr[ETH_ALEN];
	int res;

	if (!info)
		goto invalid;

	na = info->attrs[HSR_A_IFINDEX];
	if (!na)
		goto invalid;

	hsr_dev = __dev_get_by_index(genl_info_net(info),
				     nla_get_u32(info->attrs[HSR_A_IFINDEX]));
	if (!hsr_dev)
		goto invalid;
	if (!is_hsr_master(hsr_dev))
		goto invalid;


	/* Send reply */

	skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!skb_out) {
		res = -ENOMEM;
		goto fail;
	}

	msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
				info->snd_seq, &hsr_genl_family, 0,
				HSR_C_SET_NODE_LIST);
	if (!msg_head) {
		res = -ENOMEM;
		goto nla_put_failure;
	}

	res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
	if (res < 0)
		goto nla_put_failure;

	hsr = netdev_priv(hsr_dev);

	rcu_read_lock();
	pos = hsr_get_next_node(hsr, NULL, addr);
	while (pos) {
		res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr);
		if (res < 0) {
			rcu_read_unlock();
			goto nla_put_failure;
		}
		pos = hsr_get_next_node(hsr, pos, addr);
	}
	rcu_read_unlock();

	genlmsg_end(skb_out, msg_head);
	genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);

	return 0;

invalid:
	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
	return 0;

nla_put_failure:
	kfree_skb(skb_out);
	/* Fall through */

fail:
	return res;
}


static const struct genl_ops hsr_ops[] = {
	{
		.cmd = HSR_C_GET_NODE_STATUS,
		.flags = 0,
		.policy = hsr_genl_policy,
		.doit = hsr_get_node_status,
		.dumpit = NULL,
	},
	{
		.cmd = HSR_C_GET_NODE_LIST,
		.flags = 0,
		.policy = hsr_genl_policy,
		.doit = hsr_get_node_list,
		.dumpit = NULL,
	},
};

static struct genl_family hsr_genl_family __ro_after_init = {
	.hdrsize = 0,
	.name = "HSR",
	.version = 1,
	.maxattr = HSR_A_MAX,
	.module = THIS_MODULE,
	.ops = hsr_ops,
	.n_ops = ARRAY_SIZE(hsr_ops),
	.mcgrps = hsr_mcgrps,
	.n_mcgrps = ARRAY_SIZE(hsr_mcgrps),
};

int __init hsr_netlink_init(void)
{
	int rc;

	rc = rtnl_link_register(&hsr_link_ops);
	if (rc)
		goto fail_rtnl_link_register;

	rc = genl_register_family(&hsr_genl_family);
	if (rc)
		goto fail_genl_register_family;

	return 0;

fail_genl_register_family:
	rtnl_link_unregister(&hsr_link_ops);
fail_rtnl_link_register:

	return rc;
}

void __exit hsr_netlink_exit(void)
{
	genl_unregister_family(&hsr_genl_family);
	rtnl_link_unregister(&hsr_link_ops);
}

MODULE_ALIAS_RTNL_LINK("hsr");

Privacy Policy