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