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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright 2011-2014 Autronica Fire and Security AS
3 *
4 * Author(s):
5 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se
6 *
7 * Routines for handling Netlink messages for HSR.
8 */
9
10#include "hsr_netlink.h"
11#include <linux/kernel.h>
12#include <net/rtnetlink.h>
13#include <net/genetlink.h>
14#include "hsr_main.h"
15#include "hsr_device.h"
16#include "hsr_framereg.h"
17
18static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = {
19 [IFLA_HSR_SLAVE1] = { .type = NLA_U32 },
20 [IFLA_HSR_SLAVE2] = { .type = NLA_U32 },
21 [IFLA_HSR_MULTICAST_SPEC] = { .type = NLA_U8 },
22 [IFLA_HSR_VERSION] = { .type = NLA_U8 },
23 [IFLA_HSR_SUPERVISION_ADDR] = { .len = ETH_ALEN },
24 [IFLA_HSR_SEQ_NR] = { .type = NLA_U16 },
25};
26
27/* Here, it seems a netdevice has already been allocated for us, and the
28 * hsr_dev_setup routine has been executed. Nice!
29 */
30static int hsr_newlink(struct net *src_net, struct net_device *dev,
31 struct nlattr *tb[], struct nlattr *data[],
32 struct netlink_ext_ack *extack)
33{
34 struct net_device *link[2];
35 unsigned char multicast_spec, hsr_version;
36
37 if (!data) {
38 netdev_info(dev, "HSR: No slave devices specified\n");
39 return -EINVAL;
40 }
41 if (!data[IFLA_HSR_SLAVE1]) {
42 netdev_info(dev, "HSR: Slave1 device not specified\n");
43 return -EINVAL;
44 }
45 link[0] = __dev_get_by_index(src_net,
46 nla_get_u32(data[IFLA_HSR_SLAVE1]));
47 if (!data[IFLA_HSR_SLAVE2]) {
48 netdev_info(dev, "HSR: Slave2 device not specified\n");
49 return -EINVAL;
50 }
51 link[1] = __dev_get_by_index(src_net,
52 nla_get_u32(data[IFLA_HSR_SLAVE2]));
53
54 if (!link[0] || !link[1])
55 return -ENODEV;
56 if (link[0] == link[1])
57 return -EINVAL;
58
59 if (!data[IFLA_HSR_MULTICAST_SPEC])
60 multicast_spec = 0;
61 else
62 multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]);
63
64 if (!data[IFLA_HSR_VERSION])
65 hsr_version = 0;
66 else
67 hsr_version = nla_get_u8(data[IFLA_HSR_VERSION]);
68
69 return hsr_dev_finalize(dev, link, multicast_spec, hsr_version);
70}
71
72static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev)
73{
74 struct hsr_priv *hsr;
75 struct hsr_port *port;
76 int res;
77
78 hsr = netdev_priv(dev);
79
80 res = 0;
81
82 rcu_read_lock();
83 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
84 if (port)
85 res = nla_put_u32(skb, IFLA_HSR_SLAVE1, port->dev->ifindex);
86 rcu_read_unlock();
87 if (res)
88 goto nla_put_failure;
89
90 rcu_read_lock();
91 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
92 if (port)
93 res = nla_put_u32(skb, IFLA_HSR_SLAVE2, port->dev->ifindex);
94 rcu_read_unlock();
95 if (res)
96 goto nla_put_failure;
97
98 if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN,
99 hsr->sup_multicast_addr) ||
100 nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr->sequence_nr))
101 goto nla_put_failure;
102
103 return 0;
104
105nla_put_failure:
106 return -EMSGSIZE;
107}
108
109static struct rtnl_link_ops hsr_link_ops __read_mostly = {
110 .kind = "hsr",
111 .maxtype = IFLA_HSR_MAX,
112 .policy = hsr_policy,
113 .priv_size = sizeof(struct hsr_priv),
114 .setup = hsr_dev_setup,
115 .newlink = hsr_newlink,
116 .fill_info = hsr_fill_info,
117};
118
119/* attribute policy */
120static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = {
121 [HSR_A_NODE_ADDR] = { .len = ETH_ALEN },
122 [HSR_A_NODE_ADDR_B] = { .len = ETH_ALEN },
123 [HSR_A_IFINDEX] = { .type = NLA_U32 },
124 [HSR_A_IF1_AGE] = { .type = NLA_U32 },
125 [HSR_A_IF2_AGE] = { .type = NLA_U32 },
126 [HSR_A_IF1_SEQ] = { .type = NLA_U16 },
127 [HSR_A_IF2_SEQ] = { .type = NLA_U16 },
128};
129
130static struct genl_family hsr_genl_family;
131
132static const struct genl_multicast_group hsr_mcgrps[] = {
133 { .name = "hsr-network", },
134};
135
136/* This is called if for some node with MAC address addr, we only get frames
137 * over one of the slave interfaces. This would indicate an open network ring
138 * (i.e. a link has failed somewhere).
139 */
140void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN],
141 struct hsr_port *port)
142{
143 struct sk_buff *skb;
144 void *msg_head;
145 struct hsr_port *master;
146 int res;
147
148 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
149 if (!skb)
150 goto fail;
151
152 msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0,
153 HSR_C_RING_ERROR);
154 if (!msg_head)
155 goto nla_put_failure;
156
157 res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
158 if (res < 0)
159 goto nla_put_failure;
160
161 res = nla_put_u32(skb, HSR_A_IFINDEX, port->dev->ifindex);
162 if (res < 0)
163 goto nla_put_failure;
164
165 genlmsg_end(skb, msg_head);
166 genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
167
168 return;
169
170nla_put_failure:
171 kfree_skb(skb);
172
173fail:
174 rcu_read_lock();
175 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
176 netdev_warn(master->dev, "Could not send HSR ring error message\n");
177 rcu_read_unlock();
178}
179
180/* This is called when we haven't heard from the node with MAC address addr for
181 * some time (just before the node is removed from the node table/list).
182 */
183void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN])
184{
185 struct sk_buff *skb;
186 void *msg_head;
187 struct hsr_port *master;
188 int res;
189
190 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
191 if (!skb)
192 goto fail;
193
194 msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN);
195 if (!msg_head)
196 goto nla_put_failure;
197
198 res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
199 if (res < 0)
200 goto nla_put_failure;
201
202 genlmsg_end(skb, msg_head);
203 genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
204
205 return;
206
207nla_put_failure:
208 kfree_skb(skb);
209
210fail:
211 rcu_read_lock();
212 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
213 netdev_warn(master->dev, "Could not send HSR node down\n");
214 rcu_read_unlock();
215}
216
217/* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table
218 * about the status of a specific node in the network, defined by its MAC
219 * address.
220 *
221 * Input: hsr ifindex, node mac address
222 * Output: hsr ifindex, node mac address (copied from request),
223 * age of latest frame from node over slave 1, slave 2 [ms]
224 */
225static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
226{
227 /* For receiving */
228 struct nlattr *na;
229 struct net_device *hsr_dev;
230
231 /* For sending */
232 struct sk_buff *skb_out;
233 void *msg_head;
234 struct hsr_priv *hsr;
235 struct hsr_port *port;
236 unsigned char hsr_node_addr_b[ETH_ALEN];
237 int hsr_node_if1_age;
238 u16 hsr_node_if1_seq;
239 int hsr_node_if2_age;
240 u16 hsr_node_if2_seq;
241 int addr_b_ifindex;
242 int res;
243
244 if (!info)
245 goto invalid;
246
247 na = info->attrs[HSR_A_IFINDEX];
248 if (!na)
249 goto invalid;
250 na = info->attrs[HSR_A_NODE_ADDR];
251 if (!na)
252 goto invalid;
253
254 hsr_dev = __dev_get_by_index(genl_info_net(info),
255 nla_get_u32(info->attrs[HSR_A_IFINDEX]));
256 if (!hsr_dev)
257 goto invalid;
258 if (!is_hsr_master(hsr_dev))
259 goto invalid;
260
261 /* Send reply */
262 skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
263 if (!skb_out) {
264 res = -ENOMEM;
265 goto fail;
266 }
267
268 msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
269 info->snd_seq, &hsr_genl_family, 0,
270 HSR_C_SET_NODE_STATUS);
271 if (!msg_head) {
272 res = -ENOMEM;
273 goto nla_put_failure;
274 }
275
276 res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
277 if (res < 0)
278 goto nla_put_failure;
279
280 hsr = netdev_priv(hsr_dev);
281 res = hsr_get_node_data(hsr,
282 (unsigned char *)
283 nla_data(info->attrs[HSR_A_NODE_ADDR]),
284 hsr_node_addr_b,
285 &addr_b_ifindex,
286 &hsr_node_if1_age,
287 &hsr_node_if1_seq,
288 &hsr_node_if2_age,
289 &hsr_node_if2_seq);
290 if (res < 0)
291 goto nla_put_failure;
292
293 res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN,
294 nla_data(info->attrs[HSR_A_NODE_ADDR]));
295 if (res < 0)
296 goto nla_put_failure;
297
298 if (addr_b_ifindex > -1) {
299 res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN,
300 hsr_node_addr_b);
301 if (res < 0)
302 goto nla_put_failure;
303
304 res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX,
305 addr_b_ifindex);
306 if (res < 0)
307 goto nla_put_failure;
308 }
309
310 res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age);
311 if (res < 0)
312 goto nla_put_failure;
313 res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq);
314 if (res < 0)
315 goto nla_put_failure;
316 rcu_read_lock();
317 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
318 if (port)
319 res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
320 port->dev->ifindex);
321 rcu_read_unlock();
322 if (res < 0)
323 goto nla_put_failure;
324
325 res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age);
326 if (res < 0)
327 goto nla_put_failure;
328 res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq);
329 if (res < 0)
330 goto nla_put_failure;
331 rcu_read_lock();
332 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
333 if (port)
334 res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
335 port->dev->ifindex);
336 rcu_read_unlock();
337 if (res < 0)
338 goto nla_put_failure;
339
340 genlmsg_end(skb_out, msg_head);
341 genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
342
343 return 0;
344
345invalid:
346 netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
347 return 0;
348
349nla_put_failure:
350 kfree_skb(skb_out);
351 /* Fall through */
352
353fail:
354 return res;
355}
356
357/* Get a list of MacAddressA of all nodes known to this node (including self).
358 */
359static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
360{
361 /* For receiving */
362 struct nlattr *na;
363 struct net_device *hsr_dev;
364
365 /* For sending */
366 struct sk_buff *skb_out;
367 void *msg_head;
368 struct hsr_priv *hsr;
369 void *pos;
370 unsigned char addr[ETH_ALEN];
371 int res;
372
373 if (!info)
374 goto invalid;
375
376 na = info->attrs[HSR_A_IFINDEX];
377 if (!na)
378 goto invalid;
379
380 hsr_dev = __dev_get_by_index(genl_info_net(info),
381 nla_get_u32(info->attrs[HSR_A_IFINDEX]));
382 if (!hsr_dev)
383 goto invalid;
384 if (!is_hsr_master(hsr_dev))
385 goto invalid;
386
387 /* Send reply */
388 skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
389 if (!skb_out) {
390 res = -ENOMEM;
391 goto fail;
392 }
393
394 msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
395 info->snd_seq, &hsr_genl_family, 0,
396 HSR_C_SET_NODE_LIST);
397 if (!msg_head) {
398 res = -ENOMEM;
399 goto nla_put_failure;
400 }
401
402 res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
403 if (res < 0)
404 goto nla_put_failure;
405
406 hsr = netdev_priv(hsr_dev);
407
408 rcu_read_lock();
409 pos = hsr_get_next_node(hsr, NULL, addr);
410 while (pos) {
411 res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr);
412 if (res < 0) {
413 rcu_read_unlock();
414 goto nla_put_failure;
415 }
416 pos = hsr_get_next_node(hsr, pos, addr);
417 }
418 rcu_read_unlock();
419
420 genlmsg_end(skb_out, msg_head);
421 genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
422
423 return 0;
424
425invalid:
426 netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
427 return 0;
428
429nla_put_failure:
430 kfree_skb(skb_out);
431 /* Fall through */
432
433fail:
434 return res;
435}
436
437static const struct genl_ops hsr_ops[] = {
438 {
439 .cmd = HSR_C_GET_NODE_STATUS,
440 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
441 .flags = 0,
442 .doit = hsr_get_node_status,
443 .dumpit = NULL,
444 },
445 {
446 .cmd = HSR_C_GET_NODE_LIST,
447 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
448 .flags = 0,
449 .doit = hsr_get_node_list,
450 .dumpit = NULL,
451 },
452};
453
454static struct genl_family hsr_genl_family __ro_after_init = {
455 .hdrsize = 0,
456 .name = "HSR",
457 .version = 1,
458 .maxattr = HSR_A_MAX,
459 .policy = hsr_genl_policy,
460 .module = THIS_MODULE,
461 .ops = hsr_ops,
462 .n_ops = ARRAY_SIZE(hsr_ops),
463 .mcgrps = hsr_mcgrps,
464 .n_mcgrps = ARRAY_SIZE(hsr_mcgrps),
465};
466
467int __init hsr_netlink_init(void)
468{
469 int rc;
470
471 rc = rtnl_link_register(&hsr_link_ops);
472 if (rc)
473 goto fail_rtnl_link_register;
474
475 rc = genl_register_family(&hsr_genl_family);
476 if (rc)
477 goto fail_genl_register_family;
478
479 return 0;
480
481fail_genl_register_family:
482 rtnl_link_unregister(&hsr_link_ops);
483fail_rtnl_link_register:
484
485 return rc;
486}
487
488void __exit hsr_netlink_exit(void)
489{
490 genl_unregister_family(&hsr_genl_family);
491 rtnl_link_unregister(&hsr_link_ops);
492}
493
494MODULE_ALIAS_RTNL_LINK("hsr");