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