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1 | /* Copyright 2011-2013 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 | * 2011-2013 Arvid Brodin, arvid.brodin@xdin.com | |
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 | }; | |
27 | ||
28 | ||
29 | /* Here, it seems a netdevice has already been allocated for us, and the | |
30 | * hsr_dev_setup routine has been executed. Nice! | |
31 | */ | |
32 | static int hsr_newlink(struct net *src_net, struct net_device *dev, | |
33 | struct nlattr *tb[], struct nlattr *data[]) | |
34 | { | |
35 | struct net_device *link[2]; | |
36 | unsigned char multicast_spec; | |
37 | ||
38 | if (!data[IFLA_HSR_SLAVE1]) { | |
39 | netdev_info(dev, "IFLA_HSR_SLAVE1 missing!\n"); | |
40 | return -EINVAL; | |
41 | } | |
42 | link[0] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE1])); | |
43 | if (!data[IFLA_HSR_SLAVE2]) { | |
44 | netdev_info(dev, "IFLA_HSR_SLAVE2 missing!\n"); | |
45 | return -EINVAL; | |
46 | } | |
47 | link[1] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE2])); | |
48 | ||
49 | if (!link[0] || !link[1]) | |
50 | return -ENODEV; | |
51 | if (link[0] == link[1]) | |
52 | return -EINVAL; | |
53 | ||
54 | if (!data[IFLA_HSR_MULTICAST_SPEC]) | |
55 | multicast_spec = 0; | |
56 | else | |
57 | multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]); | |
58 | ||
59 | return hsr_dev_finalize(dev, link, multicast_spec); | |
60 | } | |
61 | ||
62 | static struct rtnl_link_ops hsr_link_ops __read_mostly = { | |
63 | .kind = "hsr", | |
64 | .maxtype = IFLA_HSR_MAX, | |
65 | .policy = hsr_policy, | |
66 | .priv_size = sizeof(struct hsr_priv), | |
67 | .setup = hsr_dev_setup, | |
68 | .newlink = hsr_newlink, | |
69 | }; | |
70 | ||
71 | ||
72 | ||
73 | /* attribute policy */ | |
74 | /* NLA_BINARY missing in libnl; use NLA_UNSPEC in userspace instead. */ | |
75 | static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = { | |
76 | [HSR_A_NODE_ADDR] = { .type = NLA_BINARY, .len = ETH_ALEN }, | |
77 | [HSR_A_NODE_ADDR_B] = { .type = NLA_BINARY, .len = ETH_ALEN }, | |
78 | [HSR_A_IFINDEX] = { .type = NLA_U32 }, | |
79 | [HSR_A_IF1_AGE] = { .type = NLA_U32 }, | |
80 | [HSR_A_IF2_AGE] = { .type = NLA_U32 }, | |
81 | [HSR_A_IF1_SEQ] = { .type = NLA_U16 }, | |
82 | [HSR_A_IF2_SEQ] = { .type = NLA_U16 }, | |
83 | }; | |
84 | ||
85 | static struct genl_family hsr_genl_family = { | |
86 | .id = GENL_ID_GENERATE, | |
87 | .hdrsize = 0, | |
88 | .name = "HSR", | |
89 | .version = 1, | |
90 | .maxattr = HSR_A_MAX, | |
91 | }; | |
92 | ||
93 | static struct genl_multicast_group hsr_network_genl_mcgrp = { | |
94 | .name = "hsr-network", | |
95 | }; | |
96 | ||
97 | ||
98 | ||
99 | /* This is called if for some node with MAC address addr, we only get frames | |
100 | * over one of the slave interfaces. This would indicate an open network ring | |
101 | * (i.e. a link has failed somewhere). | |
102 | */ | |
103 | void hsr_nl_ringerror(struct hsr_priv *hsr_priv, unsigned char addr[ETH_ALEN], | |
104 | enum hsr_dev_idx dev_idx) | |
105 | { | |
106 | struct sk_buff *skb; | |
107 | void *msg_head; | |
108 | int res; | |
109 | int ifindex; | |
110 | ||
111 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); | |
112 | if (!skb) | |
113 | goto fail; | |
114 | ||
115 | msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_RING_ERROR); | |
116 | if (!msg_head) | |
117 | goto nla_put_failure; | |
118 | ||
119 | res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr); | |
120 | if (res < 0) | |
121 | goto nla_put_failure; | |
122 | ||
123 | if (hsr_priv->slave[dev_idx]) | |
124 | ifindex = hsr_priv->slave[dev_idx]->ifindex; | |
125 | else | |
126 | ifindex = -1; | |
127 | res = nla_put_u32(skb, HSR_A_IFINDEX, ifindex); | |
128 | if (res < 0) | |
129 | goto nla_put_failure; | |
130 | ||
131 | genlmsg_end(skb, msg_head); | |
132 | genlmsg_multicast(skb, 0, hsr_network_genl_mcgrp.id, GFP_ATOMIC); | |
133 | ||
134 | return; | |
135 | ||
136 | nla_put_failure: | |
137 | kfree_skb(skb); | |
138 | ||
139 | fail: | |
140 | netdev_warn(hsr_priv->dev, "Could not send HSR ring error message\n"); | |
141 | } | |
142 | ||
143 | /* This is called when we haven't heard from the node with MAC address addr for | |
144 | * some time (just before the node is removed from the node table/list). | |
145 | */ | |
146 | void hsr_nl_nodedown(struct hsr_priv *hsr_priv, unsigned char addr[ETH_ALEN]) | |
147 | { | |
148 | struct sk_buff *skb; | |
149 | void *msg_head; | |
150 | int res; | |
151 | ||
152 | skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); | |
153 | if (!skb) | |
154 | goto fail; | |
155 | ||
156 | msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN); | |
157 | if (!msg_head) | |
158 | goto nla_put_failure; | |
159 | ||
160 | ||
161 | res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr); | |
162 | if (res < 0) | |
163 | goto nla_put_failure; | |
164 | ||
165 | genlmsg_end(skb, msg_head); | |
166 | genlmsg_multicast(skb, 0, hsr_network_genl_mcgrp.id, GFP_ATOMIC); | |
167 | ||
168 | return; | |
169 | ||
170 | nla_put_failure: | |
171 | kfree_skb(skb); | |
172 | ||
173 | fail: | |
174 | netdev_warn(hsr_priv->dev, "Could not send HSR node down\n"); | |
175 | } | |
176 | ||
177 | ||
178 | /* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table | |
179 | * about the status of a specific node in the network, defined by its MAC | |
180 | * address. | |
181 | * | |
182 | * Input: hsr ifindex, node mac address | |
183 | * Output: hsr ifindex, node mac address (copied from request), | |
184 | * age of latest frame from node over slave 1, slave 2 [ms] | |
185 | */ | |
186 | static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info) | |
187 | { | |
188 | /* For receiving */ | |
189 | struct nlattr *na; | |
190 | struct net_device *hsr_dev; | |
191 | ||
192 | /* For sending */ | |
193 | struct sk_buff *skb_out; | |
194 | void *msg_head; | |
195 | struct hsr_priv *hsr_priv; | |
196 | unsigned char hsr_node_addr_b[ETH_ALEN]; | |
197 | int hsr_node_if1_age; | |
198 | u16 hsr_node_if1_seq; | |
199 | int hsr_node_if2_age; | |
200 | u16 hsr_node_if2_seq; | |
201 | int addr_b_ifindex; | |
202 | int res; | |
203 | ||
204 | if (!info) | |
205 | goto invalid; | |
206 | ||
207 | na = info->attrs[HSR_A_IFINDEX]; | |
208 | if (!na) | |
209 | goto invalid; | |
210 | na = info->attrs[HSR_A_NODE_ADDR]; | |
211 | if (!na) | |
212 | goto invalid; | |
213 | ||
214 | hsr_dev = __dev_get_by_index(genl_info_net(info), | |
215 | nla_get_u32(info->attrs[HSR_A_IFINDEX])); | |
216 | if (!hsr_dev) | |
217 | goto invalid; | |
218 | if (!is_hsr_master(hsr_dev)) | |
219 | goto invalid; | |
220 | ||
221 | ||
222 | /* Send reply */ | |
223 | ||
224 | skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
225 | if (!skb_out) { | |
226 | res = -ENOMEM; | |
227 | goto fail; | |
228 | } | |
229 | ||
230 | msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid, | |
231 | info->snd_seq, &hsr_genl_family, 0, | |
232 | HSR_C_SET_NODE_STATUS); | |
233 | if (!msg_head) { | |
234 | res = -ENOMEM; | |
235 | goto nla_put_failure; | |
236 | } | |
237 | ||
238 | res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex); | |
239 | if (res < 0) | |
240 | goto nla_put_failure; | |
241 | ||
242 | hsr_priv = netdev_priv(hsr_dev); | |
243 | res = hsr_get_node_data(hsr_priv, | |
244 | (unsigned char *) nla_data(info->attrs[HSR_A_NODE_ADDR]), | |
245 | hsr_node_addr_b, | |
246 | &addr_b_ifindex, | |
247 | &hsr_node_if1_age, | |
248 | &hsr_node_if1_seq, | |
249 | &hsr_node_if2_age, | |
250 | &hsr_node_if2_seq); | |
251 | if (res < 0) | |
252 | goto fail; | |
253 | ||
254 | res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, | |
255 | nla_data(info->attrs[HSR_A_NODE_ADDR])); | |
256 | if (res < 0) | |
257 | goto nla_put_failure; | |
258 | ||
259 | if (addr_b_ifindex > -1) { | |
260 | res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN, | |
261 | hsr_node_addr_b); | |
262 | if (res < 0) | |
263 | goto nla_put_failure; | |
264 | ||
265 | res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX, addr_b_ifindex); | |
266 | if (res < 0) | |
267 | goto nla_put_failure; | |
268 | } | |
269 | ||
270 | res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age); | |
271 | if (res < 0) | |
272 | goto nla_put_failure; | |
273 | res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq); | |
274 | if (res < 0) | |
275 | goto nla_put_failure; | |
276 | if (hsr_priv->slave[0]) | |
277 | res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX, | |
278 | hsr_priv->slave[0]->ifindex); | |
279 | if (res < 0) | |
280 | goto nla_put_failure; | |
281 | ||
282 | res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age); | |
283 | if (res < 0) | |
284 | goto nla_put_failure; | |
285 | res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq); | |
286 | if (res < 0) | |
287 | goto nla_put_failure; | |
288 | if (hsr_priv->slave[1]) | |
289 | res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX, | |
290 | hsr_priv->slave[1]->ifindex); | |
291 | ||
292 | genlmsg_end(skb_out, msg_head); | |
293 | genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid); | |
294 | ||
295 | return 0; | |
296 | ||
297 | invalid: | |
298 | netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL); | |
299 | return 0; | |
300 | ||
301 | nla_put_failure: | |
302 | kfree_skb(skb_out); | |
303 | /* Fall through */ | |
304 | ||
305 | fail: | |
306 | return res; | |
307 | } | |
308 | ||
309 | static struct genl_ops hsr_ops_get_node_status = { | |
310 | .cmd = HSR_C_GET_NODE_STATUS, | |
311 | .flags = 0, | |
312 | .policy = hsr_genl_policy, | |
313 | .doit = hsr_get_node_status, | |
314 | .dumpit = NULL, | |
315 | }; | |
316 | ||
317 | ||
318 | /* Get a list of MacAddressA of all nodes known to this node (other than self). | |
319 | */ | |
320 | static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info) | |
321 | { | |
322 | /* For receiving */ | |
323 | struct nlattr *na; | |
324 | struct net_device *hsr_dev; | |
325 | ||
326 | /* For sending */ | |
327 | struct sk_buff *skb_out; | |
328 | void *msg_head; | |
329 | struct hsr_priv *hsr_priv; | |
330 | void *pos; | |
331 | unsigned char addr[ETH_ALEN]; | |
332 | int res; | |
333 | ||
334 | if (!info) | |
335 | goto invalid; | |
336 | ||
337 | na = info->attrs[HSR_A_IFINDEX]; | |
338 | if (!na) | |
339 | goto invalid; | |
340 | ||
341 | hsr_dev = __dev_get_by_index(genl_info_net(info), | |
342 | nla_get_u32(info->attrs[HSR_A_IFINDEX])); | |
343 | if (!hsr_dev) | |
344 | goto invalid; | |
345 | if (!is_hsr_master(hsr_dev)) | |
346 | goto invalid; | |
347 | ||
348 | ||
349 | /* Send reply */ | |
350 | ||
351 | skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
352 | if (!skb_out) { | |
353 | res = -ENOMEM; | |
354 | goto fail; | |
355 | } | |
356 | ||
357 | msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid, | |
358 | info->snd_seq, &hsr_genl_family, 0, | |
359 | HSR_C_SET_NODE_LIST); | |
360 | if (!msg_head) { | |
361 | res = -ENOMEM; | |
362 | goto nla_put_failure; | |
363 | } | |
364 | ||
365 | res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex); | |
366 | if (res < 0) | |
367 | goto nla_put_failure; | |
368 | ||
369 | hsr_priv = netdev_priv(hsr_dev); | |
370 | ||
371 | rcu_read_lock(); | |
372 | pos = hsr_get_next_node(hsr_priv, NULL, addr); | |
373 | while (pos) { | |
374 | res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr); | |
375 | if (res < 0) { | |
376 | rcu_read_unlock(); | |
377 | goto nla_put_failure; | |
378 | } | |
379 | pos = hsr_get_next_node(hsr_priv, pos, addr); | |
380 | } | |
381 | rcu_read_unlock(); | |
382 | ||
383 | genlmsg_end(skb_out, msg_head); | |
384 | genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid); | |
385 | ||
386 | return 0; | |
387 | ||
388 | invalid: | |
389 | netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL); | |
390 | return 0; | |
391 | ||
392 | nla_put_failure: | |
393 | kfree_skb(skb_out); | |
394 | /* Fall through */ | |
395 | ||
396 | fail: | |
397 | return res; | |
398 | } | |
399 | ||
400 | ||
401 | static struct genl_ops hsr_ops_get_node_list = { | |
402 | .cmd = HSR_C_GET_NODE_LIST, | |
403 | .flags = 0, | |
404 | .policy = hsr_genl_policy, | |
405 | .doit = hsr_get_node_list, | |
406 | .dumpit = NULL, | |
407 | }; | |
408 | ||
409 | int __init hsr_netlink_init(void) | |
410 | { | |
411 | int rc; | |
412 | ||
413 | rc = rtnl_link_register(&hsr_link_ops); | |
414 | if (rc) | |
415 | goto fail_rtnl_link_register; | |
416 | ||
417 | rc = genl_register_family(&hsr_genl_family); | |
418 | if (rc) | |
419 | goto fail_genl_register_family; | |
420 | ||
421 | rc = genl_register_ops(&hsr_genl_family, &hsr_ops_get_node_status); | |
422 | if (rc) | |
423 | goto fail_genl_register_ops; | |
424 | ||
425 | rc = genl_register_ops(&hsr_genl_family, &hsr_ops_get_node_list); | |
426 | if (rc) | |
427 | goto fail_genl_register_ops_node_list; | |
428 | ||
429 | rc = genl_register_mc_group(&hsr_genl_family, &hsr_network_genl_mcgrp); | |
430 | if (rc) | |
431 | goto fail_genl_register_mc_group; | |
432 | ||
433 | return 0; | |
434 | ||
435 | fail_genl_register_mc_group: | |
436 | genl_unregister_ops(&hsr_genl_family, &hsr_ops_get_node_list); | |
437 | fail_genl_register_ops_node_list: | |
438 | genl_unregister_ops(&hsr_genl_family, &hsr_ops_get_node_status); | |
439 | fail_genl_register_ops: | |
440 | genl_unregister_family(&hsr_genl_family); | |
441 | fail_genl_register_family: | |
442 | rtnl_link_unregister(&hsr_link_ops); | |
443 | fail_rtnl_link_register: | |
444 | ||
445 | return rc; | |
446 | } | |
447 | ||
448 | void __exit hsr_netlink_exit(void) | |
449 | { | |
450 | genl_unregister_mc_group(&hsr_genl_family, &hsr_network_genl_mcgrp); | |
451 | genl_unregister_ops(&hsr_genl_family, &hsr_ops_get_node_status); | |
452 | genl_unregister_family(&hsr_genl_family); | |
453 | ||
454 | rtnl_link_unregister(&hsr_link_ops); | |
455 | } | |
456 | ||
457 | MODULE_ALIAS_RTNL_LINK("hsr"); |