Loading...
Note: File does not exist in v3.5.6.
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
22static 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 */
34static 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
64static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev)
65{
66 struct hsr_priv *hsr_priv;
67
68 hsr_priv = netdev_priv(dev);
69
70 if (hsr_priv->slave[0])
71 if (nla_put_u32(skb, IFLA_HSR_SLAVE1, hsr_priv->slave[0]->ifindex))
72 goto nla_put_failure;
73
74 if (hsr_priv->slave[1])
75 if (nla_put_u32(skb, IFLA_HSR_SLAVE2, hsr_priv->slave[1]->ifindex))
76 goto nla_put_failure;
77
78 if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN,
79 hsr_priv->sup_multicast_addr) ||
80 nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr_priv->sequence_nr))
81 goto nla_put_failure;
82
83 return 0;
84
85nla_put_failure:
86 return -EMSGSIZE;
87}
88
89static struct rtnl_link_ops hsr_link_ops __read_mostly = {
90 .kind = "hsr",
91 .maxtype = IFLA_HSR_MAX,
92 .policy = hsr_policy,
93 .priv_size = sizeof(struct hsr_priv),
94 .setup = hsr_dev_setup,
95 .newlink = hsr_newlink,
96 .fill_info = hsr_fill_info,
97};
98
99
100
101/* attribute policy */
102/* NLA_BINARY missing in libnl; use NLA_UNSPEC in userspace instead. */
103static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = {
104 [HSR_A_NODE_ADDR] = { .type = NLA_BINARY, .len = ETH_ALEN },
105 [HSR_A_NODE_ADDR_B] = { .type = NLA_BINARY, .len = ETH_ALEN },
106 [HSR_A_IFINDEX] = { .type = NLA_U32 },
107 [HSR_A_IF1_AGE] = { .type = NLA_U32 },
108 [HSR_A_IF2_AGE] = { .type = NLA_U32 },
109 [HSR_A_IF1_SEQ] = { .type = NLA_U16 },
110 [HSR_A_IF2_SEQ] = { .type = NLA_U16 },
111};
112
113static struct genl_family hsr_genl_family = {
114 .id = GENL_ID_GENERATE,
115 .hdrsize = 0,
116 .name = "HSR",
117 .version = 1,
118 .maxattr = HSR_A_MAX,
119};
120
121static const struct genl_multicast_group hsr_mcgrps[] = {
122 { .name = "hsr-network", },
123};
124
125
126
127/* This is called if for some node with MAC address addr, we only get frames
128 * over one of the slave interfaces. This would indicate an open network ring
129 * (i.e. a link has failed somewhere).
130 */
131void hsr_nl_ringerror(struct hsr_priv *hsr_priv, unsigned char addr[ETH_ALEN],
132 enum hsr_dev_idx dev_idx)
133{
134 struct sk_buff *skb;
135 void *msg_head;
136 int res;
137 int ifindex;
138
139 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
140 if (!skb)
141 goto fail;
142
143 msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_RING_ERROR);
144 if (!msg_head)
145 goto nla_put_failure;
146
147 res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
148 if (res < 0)
149 goto nla_put_failure;
150
151 if (hsr_priv->slave[dev_idx])
152 ifindex = hsr_priv->slave[dev_idx]->ifindex;
153 else
154 ifindex = -1;
155 res = nla_put_u32(skb, HSR_A_IFINDEX, ifindex);
156 if (res < 0)
157 goto nla_put_failure;
158
159 genlmsg_end(skb, msg_head);
160 genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
161
162 return;
163
164nla_put_failure:
165 kfree_skb(skb);
166
167fail:
168 netdev_warn(hsr_priv->dev, "Could not send HSR ring error message\n");
169}
170
171/* This is called when we haven't heard from the node with MAC address addr for
172 * some time (just before the node is removed from the node table/list).
173 */
174void hsr_nl_nodedown(struct hsr_priv *hsr_priv, unsigned char addr[ETH_ALEN])
175{
176 struct sk_buff *skb;
177 void *msg_head;
178 int res;
179
180 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
181 if (!skb)
182 goto fail;
183
184 msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN);
185 if (!msg_head)
186 goto nla_put_failure;
187
188
189 res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
190 if (res < 0)
191 goto nla_put_failure;
192
193 genlmsg_end(skb, msg_head);
194 genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
195
196 return;
197
198nla_put_failure:
199 kfree_skb(skb);
200
201fail:
202 netdev_warn(hsr_priv->dev, "Could not send HSR node down\n");
203}
204
205
206/* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table
207 * about the status of a specific node in the network, defined by its MAC
208 * address.
209 *
210 * Input: hsr ifindex, node mac address
211 * Output: hsr ifindex, node mac address (copied from request),
212 * age of latest frame from node over slave 1, slave 2 [ms]
213 */
214static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
215{
216 /* For receiving */
217 struct nlattr *na;
218 struct net_device *hsr_dev;
219
220 /* For sending */
221 struct sk_buff *skb_out;
222 void *msg_head;
223 struct hsr_priv *hsr_priv;
224 unsigned char hsr_node_addr_b[ETH_ALEN];
225 int hsr_node_if1_age;
226 u16 hsr_node_if1_seq;
227 int hsr_node_if2_age;
228 u16 hsr_node_if2_seq;
229 int addr_b_ifindex;
230 int res;
231
232 if (!info)
233 goto invalid;
234
235 na = info->attrs[HSR_A_IFINDEX];
236 if (!na)
237 goto invalid;
238 na = info->attrs[HSR_A_NODE_ADDR];
239 if (!na)
240 goto invalid;
241
242 hsr_dev = __dev_get_by_index(genl_info_net(info),
243 nla_get_u32(info->attrs[HSR_A_IFINDEX]));
244 if (!hsr_dev)
245 goto invalid;
246 if (!is_hsr_master(hsr_dev))
247 goto invalid;
248
249
250 /* Send reply */
251
252 skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
253 if (!skb_out) {
254 res = -ENOMEM;
255 goto fail;
256 }
257
258 msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
259 info->snd_seq, &hsr_genl_family, 0,
260 HSR_C_SET_NODE_STATUS);
261 if (!msg_head) {
262 res = -ENOMEM;
263 goto nla_put_failure;
264 }
265
266 res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
267 if (res < 0)
268 goto nla_put_failure;
269
270 hsr_priv = netdev_priv(hsr_dev);
271 res = hsr_get_node_data(hsr_priv,
272 (unsigned char *) nla_data(info->attrs[HSR_A_NODE_ADDR]),
273 hsr_node_addr_b,
274 &addr_b_ifindex,
275 &hsr_node_if1_age,
276 &hsr_node_if1_seq,
277 &hsr_node_if2_age,
278 &hsr_node_if2_seq);
279 if (res < 0)
280 goto nla_put_failure;
281
282 res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN,
283 nla_data(info->attrs[HSR_A_NODE_ADDR]));
284 if (res < 0)
285 goto nla_put_failure;
286
287 if (addr_b_ifindex > -1) {
288 res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN,
289 hsr_node_addr_b);
290 if (res < 0)
291 goto nla_put_failure;
292
293 res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX, addr_b_ifindex);
294 if (res < 0)
295 goto nla_put_failure;
296 }
297
298 res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age);
299 if (res < 0)
300 goto nla_put_failure;
301 res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq);
302 if (res < 0)
303 goto nla_put_failure;
304 if (hsr_priv->slave[0])
305 res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
306 hsr_priv->slave[0]->ifindex);
307 if (res < 0)
308 goto nla_put_failure;
309
310 res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age);
311 if (res < 0)
312 goto nla_put_failure;
313 res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq);
314 if (res < 0)
315 goto nla_put_failure;
316 if (hsr_priv->slave[1])
317 res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
318 hsr_priv->slave[1]->ifindex);
319
320 genlmsg_end(skb_out, msg_head);
321 genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
322
323 return 0;
324
325invalid:
326 netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL);
327 return 0;
328
329nla_put_failure:
330 kfree_skb(skb_out);
331 /* Fall through */
332
333fail:
334 return res;
335}
336
337/* Get a list of MacAddressA of all nodes known to this node (other than self).
338 */
339static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
340{
341 /* For receiving */
342 struct nlattr *na;
343 struct net_device *hsr_dev;
344
345 /* For sending */
346 struct sk_buff *skb_out;
347 void *msg_head;
348 struct hsr_priv *hsr_priv;
349 void *pos;
350 unsigned char addr[ETH_ALEN];
351 int res;
352
353 if (!info)
354 goto invalid;
355
356 na = info->attrs[HSR_A_IFINDEX];
357 if (!na)
358 goto invalid;
359
360 hsr_dev = __dev_get_by_index(genl_info_net(info),
361 nla_get_u32(info->attrs[HSR_A_IFINDEX]));
362 if (!hsr_dev)
363 goto invalid;
364 if (!is_hsr_master(hsr_dev))
365 goto invalid;
366
367
368 /* Send reply */
369
370 skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
371 if (!skb_out) {
372 res = -ENOMEM;
373 goto fail;
374 }
375
376 msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
377 info->snd_seq, &hsr_genl_family, 0,
378 HSR_C_SET_NODE_LIST);
379 if (!msg_head) {
380 res = -ENOMEM;
381 goto nla_put_failure;
382 }
383
384 res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
385 if (res < 0)
386 goto nla_put_failure;
387
388 hsr_priv = netdev_priv(hsr_dev);
389
390 rcu_read_lock();
391 pos = hsr_get_next_node(hsr_priv, NULL, addr);
392 while (pos) {
393 res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr);
394 if (res < 0) {
395 rcu_read_unlock();
396 goto nla_put_failure;
397 }
398 pos = hsr_get_next_node(hsr_priv, pos, addr);
399 }
400 rcu_read_unlock();
401
402 genlmsg_end(skb_out, msg_head);
403 genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
404
405 return 0;
406
407invalid:
408 netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL);
409 return 0;
410
411nla_put_failure:
412 kfree_skb(skb_out);
413 /* Fall through */
414
415fail:
416 return res;
417}
418
419
420static const struct genl_ops hsr_ops[] = {
421 {
422 .cmd = HSR_C_GET_NODE_STATUS,
423 .flags = 0,
424 .policy = hsr_genl_policy,
425 .doit = hsr_get_node_status,
426 .dumpit = NULL,
427 },
428 {
429 .cmd = HSR_C_GET_NODE_LIST,
430 .flags = 0,
431 .policy = hsr_genl_policy,
432 .doit = hsr_get_node_list,
433 .dumpit = NULL,
434 },
435};
436
437int __init hsr_netlink_init(void)
438{
439 int rc;
440
441 rc = rtnl_link_register(&hsr_link_ops);
442 if (rc)
443 goto fail_rtnl_link_register;
444
445 rc = genl_register_family_with_ops_groups(&hsr_genl_family, hsr_ops,
446 hsr_mcgrps);
447 if (rc)
448 goto fail_genl_register_family;
449
450 return 0;
451
452fail_genl_register_family:
453 rtnl_link_unregister(&hsr_link_ops);
454fail_rtnl_link_register:
455
456 return rc;
457}
458
459void __exit hsr_netlink_exit(void)
460{
461 genl_unregister_family(&hsr_genl_family);
462 rtnl_link_unregister(&hsr_link_ops);
463}
464
465MODULE_ALIAS_RTNL_LINK("hsr");