1 /* Copyright 2011-2014 Autronica Fire and Security AS
2 *
3 * This program is free software; you can redistribute it and/or modify it
4 * under the terms of the GNU General Public License as published by the Free
5 * Software Foundation; either version 2 of the License, or (at your option)
6 * any later version.
7 *
8 * Author(s):
9 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se
10 *
11 * Routines for handling Netlink messages for HSR.
12 */
13
14 #include "hsr_netlink.h"
15 #include <linux/kernel.h>
16 #include <net/rtnetlink.h>
17 #include <net/genetlink.h>
18 #include "hsr_main.h"
19 #include "hsr_device.h"
20 #include "hsr_framereg.h"
21
22 static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = {
23 [IFLA_HSR_SLAVE1] = { .type = NLA_U32 },
24 [IFLA_HSR_SLAVE2] = { .type = NLA_U32 },
25 [IFLA_HSR_MULTICAST_SPEC] = { .type = NLA_U8 },
26 [IFLA_HSR_VERSION] = { .type = NLA_U8 },
27 [IFLA_HSR_SUPERVISION_ADDR] = { .len = ETH_ALEN },
28 [IFLA_HSR_SEQ_NR] = { .type = NLA_U16 },
29 };
30
31
32 /* Here, it seems a netdevice has already been allocated for us, and the
33 * hsr_dev_setup routine has been executed. Nice!
34 */
hsr_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)35 static int hsr_newlink(struct net *src_net, struct net_device *dev,
36 struct nlattr *tb[], struct nlattr *data[],
37 struct netlink_ext_ack *extack)
38 {
39 struct net_device *link[2];
40 unsigned char multicast_spec, hsr_version;
41
42 if (!data) {
43 netdev_info(dev, "HSR: No slave devices specified\n");
44 return -EINVAL;
45 }
46 if (!data[IFLA_HSR_SLAVE1]) {
47 netdev_info(dev, "HSR: Slave1 device not specified\n");
48 return -EINVAL;
49 }
50 link[0] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE1]));
51 if (!data[IFLA_HSR_SLAVE2]) {
52 netdev_info(dev, "HSR: Slave2 device not specified\n");
53 return -EINVAL;
54 }
55 link[1] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE2]));
56
57 if (!link[0] || !link[1])
58 return -ENODEV;
59 if (link[0] == link[1])
60 return -EINVAL;
61
62 if (!data[IFLA_HSR_MULTICAST_SPEC])
63 multicast_spec = 0;
64 else
65 multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]);
66
67 if (!data[IFLA_HSR_VERSION]) {
68 hsr_version = 0;
69 } else {
70 hsr_version = nla_get_u8(data[IFLA_HSR_VERSION]);
71 if (hsr_version > 1) {
72 NL_SET_ERR_MSG_MOD(extack,
73 "Only versions 0..1 are supported");
74 return -EINVAL;
75 }
76 }
77
78 return hsr_dev_finalize(dev, link, multicast_spec, hsr_version);
79 }
80
hsr_fill_info(struct sk_buff * skb,const struct net_device * dev)81 static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev)
82 {
83 struct hsr_priv *hsr;
84 struct hsr_port *port;
85 int res;
86
87 hsr = netdev_priv(dev);
88
89 res = 0;
90
91 rcu_read_lock();
92 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
93 if (port)
94 res = nla_put_u32(skb, IFLA_HSR_SLAVE1, port->dev->ifindex);
95 rcu_read_unlock();
96 if (res)
97 goto nla_put_failure;
98
99 rcu_read_lock();
100 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
101 if (port)
102 res = nla_put_u32(skb, IFLA_HSR_SLAVE2, port->dev->ifindex);
103 rcu_read_unlock();
104 if (res)
105 goto nla_put_failure;
106
107 if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN,
108 hsr->sup_multicast_addr) ||
109 nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr->sequence_nr))
110 goto nla_put_failure;
111
112 return 0;
113
114 nla_put_failure:
115 return -EMSGSIZE;
116 }
117
118 static struct rtnl_link_ops hsr_link_ops __read_mostly = {
119 .kind = "hsr",
120 .maxtype = IFLA_HSR_MAX,
121 .policy = hsr_policy,
122 .priv_size = sizeof(struct hsr_priv),
123 .setup = hsr_dev_setup,
124 .newlink = hsr_newlink,
125 .fill_info = hsr_fill_info,
126 };
127
128
129
130 /* attribute policy */
131 static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = {
132 [HSR_A_NODE_ADDR] = { .len = ETH_ALEN },
133 [HSR_A_NODE_ADDR_B] = { .len = ETH_ALEN },
134 [HSR_A_IFINDEX] = { .type = NLA_U32 },
135 [HSR_A_IF1_AGE] = { .type = NLA_U32 },
136 [HSR_A_IF2_AGE] = { .type = NLA_U32 },
137 [HSR_A_IF1_SEQ] = { .type = NLA_U16 },
138 [HSR_A_IF2_SEQ] = { .type = NLA_U16 },
139 };
140
141 static struct genl_family hsr_genl_family;
142
143 static const struct genl_multicast_group hsr_mcgrps[] = {
144 { .name = "hsr-network", },
145 };
146
147
148
149 /* This is called if for some node with MAC address addr, we only get frames
150 * over one of the slave interfaces. This would indicate an open network ring
151 * (i.e. a link has failed somewhere).
152 */
hsr_nl_ringerror(struct hsr_priv * hsr,unsigned char addr[ETH_ALEN],struct hsr_port * port)153 void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN],
154 struct hsr_port *port)
155 {
156 struct sk_buff *skb;
157 void *msg_head;
158 struct hsr_port *master;
159 int res;
160
161 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
162 if (!skb)
163 goto fail;
164
165 msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_RING_ERROR);
166 if (!msg_head)
167 goto nla_put_failure;
168
169 res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
170 if (res < 0)
171 goto nla_put_failure;
172
173 res = nla_put_u32(skb, HSR_A_IFINDEX, port->dev->ifindex);
174 if (res < 0)
175 goto nla_put_failure;
176
177 genlmsg_end(skb, msg_head);
178 genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
179
180 return;
181
182 nla_put_failure:
183 kfree_skb(skb);
184
185 fail:
186 rcu_read_lock();
187 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
188 netdev_warn(master->dev, "Could not send HSR ring error message\n");
189 rcu_read_unlock();
190 }
191
192 /* This is called when we haven't heard from the node with MAC address addr for
193 * some time (just before the node is removed from the node table/list).
194 */
hsr_nl_nodedown(struct hsr_priv * hsr,unsigned char addr[ETH_ALEN])195 void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN])
196 {
197 struct sk_buff *skb;
198 void *msg_head;
199 struct hsr_port *master;
200 int res;
201
202 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
203 if (!skb)
204 goto fail;
205
206 msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN);
207 if (!msg_head)
208 goto nla_put_failure;
209
210
211 res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
212 if (res < 0)
213 goto nla_put_failure;
214
215 genlmsg_end(skb, msg_head);
216 genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
217
218 return;
219
220 nla_put_failure:
221 kfree_skb(skb);
222
223 fail:
224 rcu_read_lock();
225 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
226 netdev_warn(master->dev, "Could not send HSR node down\n");
227 rcu_read_unlock();
228 }
229
230
231 /* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table
232 * about the status of a specific node in the network, defined by its MAC
233 * address.
234 *
235 * Input: hsr ifindex, node mac address
236 * Output: hsr ifindex, node mac address (copied from request),
237 * age of latest frame from node over slave 1, slave 2 [ms]
238 */
hsr_get_node_status(struct sk_buff * skb_in,struct genl_info * info)239 static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
240 {
241 /* For receiving */
242 struct nlattr *na;
243 struct net_device *hsr_dev;
244
245 /* For sending */
246 struct sk_buff *skb_out;
247 void *msg_head;
248 struct hsr_priv *hsr;
249 struct hsr_port *port;
250 unsigned char hsr_node_addr_b[ETH_ALEN];
251 int hsr_node_if1_age;
252 u16 hsr_node_if1_seq;
253 int hsr_node_if2_age;
254 u16 hsr_node_if2_seq;
255 int addr_b_ifindex;
256 int res;
257
258 if (!info)
259 goto invalid;
260
261 na = info->attrs[HSR_A_IFINDEX];
262 if (!na)
263 goto invalid;
264 na = info->attrs[HSR_A_NODE_ADDR];
265 if (!na)
266 goto invalid;
267
268 rcu_read_lock();
269 hsr_dev = dev_get_by_index_rcu(genl_info_net(info),
270 nla_get_u32(info->attrs[HSR_A_IFINDEX]));
271 if (!hsr_dev)
272 goto rcu_unlock;
273 if (!is_hsr_master(hsr_dev))
274 goto rcu_unlock;
275
276 /* Send reply */
277 skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
278 if (!skb_out) {
279 res = -ENOMEM;
280 goto fail;
281 }
282
283 msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
284 info->snd_seq, &hsr_genl_family, 0,
285 HSR_C_SET_NODE_STATUS);
286 if (!msg_head) {
287 res = -ENOMEM;
288 goto nla_put_failure;
289 }
290
291 res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
292 if (res < 0)
293 goto nla_put_failure;
294
295 hsr = netdev_priv(hsr_dev);
296 res = hsr_get_node_data(hsr,
297 (unsigned char *) nla_data(info->attrs[HSR_A_NODE_ADDR]),
298 hsr_node_addr_b,
299 &addr_b_ifindex,
300 &hsr_node_if1_age,
301 &hsr_node_if1_seq,
302 &hsr_node_if2_age,
303 &hsr_node_if2_seq);
304 if (res < 0)
305 goto nla_put_failure;
306
307 res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN,
308 nla_data(info->attrs[HSR_A_NODE_ADDR]));
309 if (res < 0)
310 goto nla_put_failure;
311
312 if (addr_b_ifindex > -1) {
313 res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN,
314 hsr_node_addr_b);
315 if (res < 0)
316 goto nla_put_failure;
317
318 res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX, addr_b_ifindex);
319 if (res < 0)
320 goto nla_put_failure;
321 }
322
323 res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age);
324 if (res < 0)
325 goto nla_put_failure;
326 res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq);
327 if (res < 0)
328 goto nla_put_failure;
329 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
330 if (port)
331 res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
332 port->dev->ifindex);
333 if (res < 0)
334 goto nla_put_failure;
335
336 res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age);
337 if (res < 0)
338 goto nla_put_failure;
339 res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq);
340 if (res < 0)
341 goto nla_put_failure;
342 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
343 if (port)
344 res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
345 port->dev->ifindex);
346 if (res < 0)
347 goto nla_put_failure;
348
349 rcu_read_unlock();
350
351 genlmsg_end(skb_out, msg_head);
352 genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
353
354 return 0;
355
356 rcu_unlock:
357 rcu_read_unlock();
358 invalid:
359 netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
360 return 0;
361
362 nla_put_failure:
363 kfree_skb(skb_out);
364 /* Fall through */
365
366 fail:
367 rcu_read_unlock();
368 return res;
369 }
370
371 /* Get a list of MacAddressA of all nodes known to this node (including self).
372 */
hsr_get_node_list(struct sk_buff * skb_in,struct genl_info * info)373 static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
374 {
375 unsigned char addr[ETH_ALEN];
376 struct net_device *hsr_dev;
377 struct sk_buff *skb_out;
378 struct hsr_priv *hsr;
379 bool restart = false;
380 struct nlattr *na;
381 void *pos = NULL;
382 void *msg_head;
383 int res;
384
385 if (!info)
386 goto invalid;
387
388 na = info->attrs[HSR_A_IFINDEX];
389 if (!na)
390 goto invalid;
391
392 rcu_read_lock();
393 hsr_dev = dev_get_by_index_rcu(genl_info_net(info),
394 nla_get_u32(info->attrs[HSR_A_IFINDEX]));
395 if (!hsr_dev)
396 goto rcu_unlock;
397 if (!is_hsr_master(hsr_dev))
398 goto rcu_unlock;
399
400 restart:
401 /* Send reply */
402 skb_out = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_ATOMIC);
403 if (!skb_out) {
404 res = -ENOMEM;
405 goto fail;
406 }
407
408 msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
409 info->snd_seq, &hsr_genl_family, 0,
410 HSR_C_SET_NODE_LIST);
411 if (!msg_head) {
412 res = -ENOMEM;
413 goto nla_put_failure;
414 }
415
416 if (!restart) {
417 res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
418 if (res < 0)
419 goto nla_put_failure;
420 }
421
422 hsr = netdev_priv(hsr_dev);
423
424 if (!pos)
425 pos = hsr_get_next_node(hsr, NULL, addr);
426 while (pos) {
427 res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr);
428 if (res < 0) {
429 if (res == -EMSGSIZE) {
430 genlmsg_end(skb_out, msg_head);
431 genlmsg_unicast(genl_info_net(info), skb_out,
432 info->snd_portid);
433 restart = true;
434 goto restart;
435 }
436 goto nla_put_failure;
437 }
438 pos = hsr_get_next_node(hsr, pos, addr);
439 }
440 rcu_read_unlock();
441
442 genlmsg_end(skb_out, msg_head);
443 genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
444
445 return 0;
446
447 rcu_unlock:
448 rcu_read_unlock();
449 invalid:
450 netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
451 return 0;
452
453 nla_put_failure:
454 nlmsg_free(skb_out);
455 /* Fall through */
456
457 fail:
458 rcu_read_unlock();
459 return res;
460 }
461
462
463 static const struct genl_ops hsr_ops[] = {
464 {
465 .cmd = HSR_C_GET_NODE_STATUS,
466 .flags = 0,
467 .policy = hsr_genl_policy,
468 .doit = hsr_get_node_status,
469 .dumpit = NULL,
470 },
471 {
472 .cmd = HSR_C_GET_NODE_LIST,
473 .flags = 0,
474 .policy = hsr_genl_policy,
475 .doit = hsr_get_node_list,
476 .dumpit = NULL,
477 },
478 };
479
480 static struct genl_family hsr_genl_family __ro_after_init = {
481 .hdrsize = 0,
482 .name = "HSR",
483 .version = 1,
484 .maxattr = HSR_A_MAX,
485 .netnsok = true,
486 .module = THIS_MODULE,
487 .ops = hsr_ops,
488 .n_ops = ARRAY_SIZE(hsr_ops),
489 .mcgrps = hsr_mcgrps,
490 .n_mcgrps = ARRAY_SIZE(hsr_mcgrps),
491 };
492
hsr_netlink_init(void)493 int __init hsr_netlink_init(void)
494 {
495 int rc;
496
497 rc = rtnl_link_register(&hsr_link_ops);
498 if (rc)
499 goto fail_rtnl_link_register;
500
501 rc = genl_register_family(&hsr_genl_family);
502 if (rc)
503 goto fail_genl_register_family;
504
505 return 0;
506
507 fail_genl_register_family:
508 rtnl_link_unregister(&hsr_link_ops);
509 fail_rtnl_link_register:
510
511 return rc;
512 }
513
hsr_netlink_exit(void)514 void __exit hsr_netlink_exit(void)
515 {
516 genl_unregister_family(&hsr_genl_family);
517 rtnl_link_unregister(&hsr_link_ops);
518 }
519
520 MODULE_ALIAS_RTNL_LINK("hsr");
521