hsr_netlink.c 10.5 KB
Newer Older
1
/* Copyright 2011-2014 Autronica Fire and Security AS
2 3 4 5 6 7 8
 *
 * 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):
9
 *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
 *
 * 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 },
26 27
	[IFLA_HSR_SUPERVISION_ADDR]	= { .type = NLA_BINARY, .len = ETH_ALEN },
	[IFLA_HSR_SEQ_NR]		= { .type = NLA_U16 },
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
};


/* 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;

	if (!data[IFLA_HSR_SLAVE1]) {
		netdev_info(dev, "IFLA_HSR_SLAVE1 missing!\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, "IFLA_HSR_SLAVE2 missing!\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]);

	return hsr_dev_finalize(dev, link, multicast_spec);
}

64 65
static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
66
	struct hsr_priv *hsr;
67

68
	hsr = netdev_priv(dev);
69

70 71
	if (hsr->slave[0])
		if (nla_put_u32(skb, IFLA_HSR_SLAVE1, hsr->slave[0]->ifindex))
72 73
			goto nla_put_failure;

74 75
	if (hsr->slave[1])
		if (nla_put_u32(skb, IFLA_HSR_SLAVE2, hsr->slave[1]->ifindex))
76 77 78
			goto nla_put_failure;

	if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN,
79 80
		    hsr->sup_multicast_addr) ||
	    nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr->sequence_nr))
81 82 83 84 85 86 87 88
		goto nla_put_failure;

	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

89 90 91 92 93 94 95
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,
96
	.fill_info	= hsr_fill_info,
97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120
};



/* attribute policy */
/* NLA_BINARY missing in libnl; use NLA_UNSPEC in userspace instead. */
static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = {
	[HSR_A_NODE_ADDR] = { .type = NLA_BINARY, .len = ETH_ALEN },
	[HSR_A_NODE_ADDR_B] = { .type = NLA_BINARY, .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 = {
	.id = GENL_ID_GENERATE,
	.hdrsize = 0,
	.name = "HSR",
	.version = 1,
	.maxattr = HSR_A_MAX,
};

121 122
static const struct genl_multicast_group hsr_mcgrps[] = {
	{ .name = "hsr-network", },
123 124 125 126 127 128 129 130
};



/* 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).
 */
131
void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN],
132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150
		      enum hsr_dev_idx dev_idx)
{
	struct sk_buff *skb;
	void *msg_head;
	int res;
	int ifindex;

	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;

151 152
	if (hsr->slave[dev_idx])
		ifindex = hsr->slave[dev_idx]->ifindex;
153 154 155 156 157 158 159
	else
		ifindex = -1;
	res = nla_put_u32(skb, HSR_A_IFINDEX, ifindex);
	if (res < 0)
		goto nla_put_failure;

	genlmsg_end(skb, msg_head);
160
	genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
161 162 163 164 165 166 167

	return;

nla_put_failure:
	kfree_skb(skb);

fail:
168
	netdev_warn(hsr->dev, "Could not send HSR ring error message\n");
169 170 171 172 173
}

/* 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).
 */
174
void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN])
175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193
{
	struct sk_buff *skb;
	void *msg_head;
	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);
194
	genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
195 196 197 198 199 200 201

	return;

nla_put_failure:
	kfree_skb(skb);

fail:
202
	netdev_warn(hsr->dev, "Could not send HSR node down\n");
203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222
}


/* 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;
223
	struct hsr_priv *hsr;
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
	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;

270 271
	hsr = netdev_priv(hsr_dev);
	res = hsr_get_node_data(hsr,
272 273 274 275 276 277 278 279
			(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)
280
		goto nla_put_failure;
281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303

	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;
304
	if (hsr->slave[0])
305
		res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
306
						hsr->slave[0]->ifindex);
307 308 309 310 311 312 313 314 315
	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;
316
	if (hsr->slave[1])
317
		res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
318
						hsr->slave[1]->ifindex);
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

	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);
	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 (other than 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;
348
	struct hsr_priv *hsr;
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
	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;

388
	hsr = netdev_priv(hsr_dev);
389 390

	rcu_read_lock();
391
	pos = hsr_get_next_node(hsr, NULL, addr);
392 393 394 395 396 397
	while (pos) {
		res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr);
		if (res < 0) {
			rcu_read_unlock();
			goto nla_put_failure;
		}
398
		pos = hsr_get_next_node(hsr, pos, addr);
399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419
	}
	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);
	return 0;

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

fail:
	return res;
}


420
static const struct genl_ops hsr_ops[] = {
421 422 423 424 425 426 427 428 429 430 431 432 433 434
	{
		.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,
	},
435 436 437 438 439 440 441 442 443 444
};

int __init hsr_netlink_init(void)
{
	int rc;

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

445 446
	rc = genl_register_family_with_ops_groups(&hsr_genl_family, hsr_ops,
						  hsr_mcgrps);
447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465
	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");