Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
915d7e5e DL |
2 | /* |
3 | * SR-IPv6 implementation | |
4 | * | |
5 | * Author: | |
6 | * David Lebrun <david.lebrun@uclouvain.be> | |
915d7e5e DL |
7 | */ |
8 | ||
9 | #include <linux/errno.h> | |
10 | #include <linux/types.h> | |
11 | #include <linux/socket.h> | |
12 | #include <linux/net.h> | |
13 | #include <linux/in6.h> | |
14 | #include <linux/slab.h> | |
0eb71a9d | 15 | #include <linux/rhashtable.h> |
915d7e5e DL |
16 | |
17 | #include <net/ipv6.h> | |
18 | #include <net/protocol.h> | |
19 | ||
20 | #include <net/seg6.h> | |
21 | #include <net/genetlink.h> | |
22 | #include <linux/seg6.h> | |
23 | #include <linux/seg6_genl.h> | |
4f4853dc DL |
24 | #ifdef CONFIG_IPV6_SEG6_HMAC |
25 | #include <net/seg6_hmac.h> | |
26 | #endif | |
915d7e5e | 27 | |
6c8702c6 DL |
28 | bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len) |
29 | { | |
30 | int trailing; | |
31 | unsigned int tlv_offset; | |
32 | ||
33 | if (srh->type != IPV6_SRCRT_TYPE_4) | |
34 | return false; | |
35 | ||
36 | if (((srh->hdrlen + 1) << 3) != len) | |
37 | return false; | |
38 | ||
925615ce | 39 | if (srh->segments_left > srh->first_segment) |
6c8702c6 DL |
40 | return false; |
41 | ||
42 | tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4); | |
43 | ||
44 | trailing = len - tlv_offset; | |
45 | if (trailing < 0) | |
46 | return false; | |
47 | ||
48 | while (trailing) { | |
49 | struct sr6_tlv *tlv; | |
50 | unsigned int tlv_len; | |
51 | ||
2f3bb642 DL |
52 | if (trailing < sizeof(*tlv)) |
53 | return false; | |
54 | ||
6c8702c6 DL |
55 | tlv = (struct sr6_tlv *)((unsigned char *)srh + tlv_offset); |
56 | tlv_len = sizeof(*tlv) + tlv->len; | |
57 | ||
58 | trailing -= tlv_len; | |
59 | if (trailing < 0) | |
60 | return false; | |
61 | ||
62 | tlv_offset += tlv_len; | |
63 | } | |
64 | ||
65 | return true; | |
66 | } | |
67 | ||
915d7e5e DL |
68 | static struct genl_family seg6_genl_family; |
69 | ||
70 | static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = { | |
71 | [SEG6_ATTR_DST] = { .type = NLA_BINARY, | |
72 | .len = sizeof(struct in6_addr) }, | |
73 | [SEG6_ATTR_DSTLEN] = { .type = NLA_S32, }, | |
74 | [SEG6_ATTR_HMACKEYID] = { .type = NLA_U32, }, | |
75 | [SEG6_ATTR_SECRET] = { .type = NLA_BINARY, }, | |
76 | [SEG6_ATTR_SECRETLEN] = { .type = NLA_U8, }, | |
77 | [SEG6_ATTR_ALGID] = { .type = NLA_U8, }, | |
78 | [SEG6_ATTR_HMACINFO] = { .type = NLA_NESTED, }, | |
79 | }; | |
80 | ||
4f4853dc DL |
81 | #ifdef CONFIG_IPV6_SEG6_HMAC |
82 | ||
83 | static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info) | |
84 | { | |
85 | struct net *net = genl_info_net(info); | |
86 | struct seg6_pernet_data *sdata; | |
87 | struct seg6_hmac_info *hinfo; | |
88 | u32 hmackeyid; | |
89 | char *secret; | |
90 | int err = 0; | |
91 | u8 algid; | |
92 | u8 slen; | |
93 | ||
94 | sdata = seg6_pernet(net); | |
95 | ||
96 | if (!info->attrs[SEG6_ATTR_HMACKEYID] || | |
97 | !info->attrs[SEG6_ATTR_SECRETLEN] || | |
98 | !info->attrs[SEG6_ATTR_ALGID]) | |
99 | return -EINVAL; | |
100 | ||
101 | hmackeyid = nla_get_u32(info->attrs[SEG6_ATTR_HMACKEYID]); | |
102 | slen = nla_get_u8(info->attrs[SEG6_ATTR_SECRETLEN]); | |
103 | algid = nla_get_u8(info->attrs[SEG6_ATTR_ALGID]); | |
104 | ||
105 | if (hmackeyid == 0) | |
106 | return -EINVAL; | |
107 | ||
108 | if (slen > SEG6_HMAC_SECRET_LEN) | |
109 | return -EINVAL; | |
110 | ||
111 | mutex_lock(&sdata->lock); | |
112 | hinfo = seg6_hmac_info_lookup(net, hmackeyid); | |
113 | ||
114 | if (!slen) { | |
115 | if (!hinfo) | |
116 | err = -ENOENT; | |
117 | ||
118 | err = seg6_hmac_info_del(net, hmackeyid); | |
119 | ||
120 | goto out_unlock; | |
121 | } | |
122 | ||
123 | if (!info->attrs[SEG6_ATTR_SECRET]) { | |
124 | err = -EINVAL; | |
125 | goto out_unlock; | |
126 | } | |
127 | ||
128 | if (hinfo) { | |
129 | err = seg6_hmac_info_del(net, hmackeyid); | |
130 | if (err) | |
131 | goto out_unlock; | |
132 | } | |
133 | ||
134 | secret = (char *)nla_data(info->attrs[SEG6_ATTR_SECRET]); | |
135 | ||
136 | hinfo = kzalloc(sizeof(*hinfo), GFP_KERNEL); | |
137 | if (!hinfo) { | |
138 | err = -ENOMEM; | |
139 | goto out_unlock; | |
140 | } | |
141 | ||
142 | memcpy(hinfo->secret, secret, slen); | |
143 | hinfo->slen = slen; | |
144 | hinfo->alg_id = algid; | |
145 | hinfo->hmackeyid = hmackeyid; | |
146 | ||
147 | err = seg6_hmac_info_add(net, hmackeyid, hinfo); | |
148 | if (err) | |
149 | kfree(hinfo); | |
150 | ||
151 | out_unlock: | |
152 | mutex_unlock(&sdata->lock); | |
153 | return err; | |
154 | } | |
155 | ||
156 | #else | |
157 | ||
915d7e5e DL |
158 | static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info) |
159 | { | |
160 | return -ENOTSUPP; | |
161 | } | |
162 | ||
4f4853dc DL |
163 | #endif |
164 | ||
915d7e5e DL |
165 | static int seg6_genl_set_tunsrc(struct sk_buff *skb, struct genl_info *info) |
166 | { | |
167 | struct net *net = genl_info_net(info); | |
168 | struct in6_addr *val, *t_old, *t_new; | |
169 | struct seg6_pernet_data *sdata; | |
170 | ||
171 | sdata = seg6_pernet(net); | |
172 | ||
173 | if (!info->attrs[SEG6_ATTR_DST]) | |
174 | return -EINVAL; | |
175 | ||
176 | val = nla_data(info->attrs[SEG6_ATTR_DST]); | |
177 | t_new = kmemdup(val, sizeof(*val), GFP_KERNEL); | |
e363116b ED |
178 | if (!t_new) |
179 | return -ENOMEM; | |
915d7e5e DL |
180 | |
181 | mutex_lock(&sdata->lock); | |
182 | ||
183 | t_old = sdata->tun_src; | |
184 | rcu_assign_pointer(sdata->tun_src, t_new); | |
185 | ||
186 | mutex_unlock(&sdata->lock); | |
187 | ||
188 | synchronize_net(); | |
189 | kfree(t_old); | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | static int seg6_genl_get_tunsrc(struct sk_buff *skb, struct genl_info *info) | |
195 | { | |
196 | struct net *net = genl_info_net(info); | |
197 | struct in6_addr *tun_src; | |
198 | struct sk_buff *msg; | |
199 | void *hdr; | |
200 | ||
201 | msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
202 | if (!msg) | |
203 | return -ENOMEM; | |
204 | ||
205 | hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, | |
206 | &seg6_genl_family, 0, SEG6_CMD_GET_TUNSRC); | |
207 | if (!hdr) | |
208 | goto free_msg; | |
209 | ||
210 | rcu_read_lock(); | |
211 | tun_src = rcu_dereference(seg6_pernet(net)->tun_src); | |
212 | ||
213 | if (nla_put(msg, SEG6_ATTR_DST, sizeof(struct in6_addr), tun_src)) | |
214 | goto nla_put_failure; | |
215 | ||
216 | rcu_read_unlock(); | |
217 | ||
218 | genlmsg_end(msg, hdr); | |
d1f20798 | 219 | return genlmsg_reply(msg, info); |
915d7e5e DL |
220 | |
221 | nla_put_failure: | |
222 | rcu_read_unlock(); | |
915d7e5e DL |
223 | free_msg: |
224 | nlmsg_free(msg); | |
225 | return -ENOMEM; | |
226 | } | |
227 | ||
4f4853dc DL |
228 | #ifdef CONFIG_IPV6_SEG6_HMAC |
229 | ||
230 | static int __seg6_hmac_fill_info(struct seg6_hmac_info *hinfo, | |
231 | struct sk_buff *msg) | |
232 | { | |
233 | if (nla_put_u32(msg, SEG6_ATTR_HMACKEYID, hinfo->hmackeyid) || | |
234 | nla_put_u8(msg, SEG6_ATTR_SECRETLEN, hinfo->slen) || | |
235 | nla_put(msg, SEG6_ATTR_SECRET, hinfo->slen, hinfo->secret) || | |
236 | nla_put_u8(msg, SEG6_ATTR_ALGID, hinfo->alg_id)) | |
237 | return -1; | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static int __seg6_genl_dumphmac_element(struct seg6_hmac_info *hinfo, | |
243 | u32 portid, u32 seq, u32 flags, | |
244 | struct sk_buff *skb, u8 cmd) | |
245 | { | |
246 | void *hdr; | |
247 | ||
248 | hdr = genlmsg_put(skb, portid, seq, &seg6_genl_family, flags, cmd); | |
249 | if (!hdr) | |
250 | return -ENOMEM; | |
251 | ||
252 | if (__seg6_hmac_fill_info(hinfo, skb) < 0) | |
253 | goto nla_put_failure; | |
254 | ||
255 | genlmsg_end(skb, hdr); | |
256 | return 0; | |
257 | ||
258 | nla_put_failure: | |
259 | genlmsg_cancel(skb, hdr); | |
260 | return -EMSGSIZE; | |
261 | } | |
262 | ||
263 | static int seg6_genl_dumphmac_start(struct netlink_callback *cb) | |
264 | { | |
265 | struct net *net = sock_net(cb->skb->sk); | |
266 | struct seg6_pernet_data *sdata; | |
267 | struct rhashtable_iter *iter; | |
268 | ||
269 | sdata = seg6_pernet(net); | |
270 | iter = (struct rhashtable_iter *)cb->args[0]; | |
271 | ||
272 | if (!iter) { | |
273 | iter = kmalloc(sizeof(*iter), GFP_KERNEL); | |
274 | if (!iter) | |
275 | return -ENOMEM; | |
276 | ||
277 | cb->args[0] = (long)iter; | |
278 | } | |
279 | ||
280 | rhashtable_walk_enter(&sdata->hmac_infos, iter); | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | static int seg6_genl_dumphmac_done(struct netlink_callback *cb) | |
286 | { | |
287 | struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0]; | |
288 | ||
289 | rhashtable_walk_exit(iter); | |
290 | ||
291 | kfree(iter); | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb) | |
297 | { | |
298 | struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0]; | |
4f4853dc DL |
299 | struct seg6_hmac_info *hinfo; |
300 | int ret; | |
301 | ||
97a6ec4a | 302 | rhashtable_walk_start(iter); |
4f4853dc DL |
303 | |
304 | for (;;) { | |
305 | hinfo = rhashtable_walk_next(iter); | |
306 | ||
307 | if (IS_ERR(hinfo)) { | |
308 | if (PTR_ERR(hinfo) == -EAGAIN) | |
309 | continue; | |
310 | ret = PTR_ERR(hinfo); | |
311 | goto done; | |
312 | } else if (!hinfo) { | |
313 | break; | |
314 | } | |
315 | ||
316 | ret = __seg6_genl_dumphmac_element(hinfo, | |
317 | NETLINK_CB(cb->skb).portid, | |
318 | cb->nlh->nlmsg_seq, | |
319 | NLM_F_MULTI, | |
320 | skb, SEG6_CMD_DUMPHMAC); | |
321 | if (ret) | |
322 | goto done; | |
323 | } | |
324 | ||
325 | ret = skb->len; | |
326 | ||
327 | done: | |
328 | rhashtable_walk_stop(iter); | |
329 | return ret; | |
330 | } | |
331 | ||
332 | #else | |
333 | ||
334 | static int seg6_genl_dumphmac_start(struct netlink_callback *cb) | |
335 | { | |
336 | return 0; | |
337 | } | |
338 | ||
339 | static int seg6_genl_dumphmac_done(struct netlink_callback *cb) | |
340 | { | |
341 | return 0; | |
342 | } | |
343 | ||
915d7e5e DL |
344 | static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb) |
345 | { | |
346 | return -ENOTSUPP; | |
347 | } | |
348 | ||
4f4853dc DL |
349 | #endif |
350 | ||
915d7e5e DL |
351 | static int __net_init seg6_net_init(struct net *net) |
352 | { | |
353 | struct seg6_pernet_data *sdata; | |
354 | ||
355 | sdata = kzalloc(sizeof(*sdata), GFP_KERNEL); | |
356 | if (!sdata) | |
357 | return -ENOMEM; | |
358 | ||
359 | mutex_init(&sdata->lock); | |
360 | ||
361 | sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL); | |
362 | if (!sdata->tun_src) { | |
363 | kfree(sdata); | |
364 | return -ENOMEM; | |
365 | } | |
366 | ||
367 | net->ipv6.seg6_data = sdata; | |
368 | ||
4f4853dc DL |
369 | #ifdef CONFIG_IPV6_SEG6_HMAC |
370 | seg6_hmac_net_init(net); | |
371 | #endif | |
372 | ||
915d7e5e DL |
373 | return 0; |
374 | } | |
375 | ||
376 | static void __net_exit seg6_net_exit(struct net *net) | |
377 | { | |
378 | struct seg6_pernet_data *sdata = seg6_pernet(net); | |
379 | ||
4f4853dc DL |
380 | #ifdef CONFIG_IPV6_SEG6_HMAC |
381 | seg6_hmac_net_exit(net); | |
382 | #endif | |
383 | ||
915d7e5e DL |
384 | kfree(sdata->tun_src); |
385 | kfree(sdata); | |
386 | } | |
387 | ||
388 | static struct pernet_operations ip6_segments_ops = { | |
389 | .init = seg6_net_init, | |
390 | .exit = seg6_net_exit, | |
391 | }; | |
392 | ||
393 | static const struct genl_ops seg6_genl_ops[] = { | |
394 | { | |
395 | .cmd = SEG6_CMD_SETHMAC, | |
ef6243ac | 396 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
915d7e5e | 397 | .doit = seg6_genl_sethmac, |
915d7e5e DL |
398 | .flags = GENL_ADMIN_PERM, |
399 | }, | |
400 | { | |
401 | .cmd = SEG6_CMD_DUMPHMAC, | |
ef6243ac | 402 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
4f4853dc | 403 | .start = seg6_genl_dumphmac_start, |
915d7e5e | 404 | .dumpit = seg6_genl_dumphmac, |
4f4853dc | 405 | .done = seg6_genl_dumphmac_done, |
915d7e5e DL |
406 | .flags = GENL_ADMIN_PERM, |
407 | }, | |
408 | { | |
409 | .cmd = SEG6_CMD_SET_TUNSRC, | |
ef6243ac | 410 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
915d7e5e | 411 | .doit = seg6_genl_set_tunsrc, |
915d7e5e DL |
412 | .flags = GENL_ADMIN_PERM, |
413 | }, | |
414 | { | |
415 | .cmd = SEG6_CMD_GET_TUNSRC, | |
ef6243ac | 416 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
915d7e5e | 417 | .doit = seg6_genl_get_tunsrc, |
915d7e5e DL |
418 | .flags = GENL_ADMIN_PERM, |
419 | }, | |
420 | }; | |
421 | ||
422 | static struct genl_family seg6_genl_family __ro_after_init = { | |
423 | .hdrsize = 0, | |
424 | .name = SEG6_GENL_NAME, | |
425 | .version = SEG6_GENL_VERSION, | |
426 | .maxattr = SEG6_ATTR_MAX, | |
3b0f31f2 | 427 | .policy = seg6_genl_policy, |
915d7e5e DL |
428 | .netnsok = true, |
429 | .parallel_ops = true, | |
430 | .ops = seg6_genl_ops, | |
431 | .n_ops = ARRAY_SIZE(seg6_genl_ops), | |
432 | .module = THIS_MODULE, | |
433 | }; | |
434 | ||
435 | int __init seg6_init(void) | |
436 | { | |
672e2477 | 437 | int err; |
915d7e5e DL |
438 | |
439 | err = genl_register_family(&seg6_genl_family); | |
440 | if (err) | |
441 | goto out; | |
442 | ||
443 | err = register_pernet_subsys(&ip6_segments_ops); | |
444 | if (err) | |
445 | goto out_unregister_genl; | |
446 | ||
46738b13 | 447 | #ifdef CONFIG_IPV6_SEG6_LWTUNNEL |
6c8702c6 DL |
448 | err = seg6_iptunnel_init(); |
449 | if (err) | |
450 | goto out_unregister_pernet; | |
d1df6fd8 DL |
451 | |
452 | err = seg6_local_init(); | |
453 | if (err) | |
454 | goto out_unregister_pernet; | |
46738b13 | 455 | #endif |
6c8702c6 | 456 | |
4f4853dc DL |
457 | #ifdef CONFIG_IPV6_SEG6_HMAC |
458 | err = seg6_hmac_init(); | |
459 | if (err) | |
460 | goto out_unregister_iptun; | |
461 | #endif | |
462 | ||
915d7e5e DL |
463 | pr_info("Segment Routing with IPv6\n"); |
464 | ||
465 | out: | |
466 | return err; | |
4f4853dc DL |
467 | #ifdef CONFIG_IPV6_SEG6_HMAC |
468 | out_unregister_iptun: | |
46738b13 | 469 | #ifdef CONFIG_IPV6_SEG6_LWTUNNEL |
d1df6fd8 | 470 | seg6_local_exit(); |
4f4853dc DL |
471 | seg6_iptunnel_exit(); |
472 | #endif | |
46738b13 DL |
473 | #endif |
474 | #ifdef CONFIG_IPV6_SEG6_LWTUNNEL | |
6c8702c6 DL |
475 | out_unregister_pernet: |
476 | unregister_pernet_subsys(&ip6_segments_ops); | |
46738b13 | 477 | #endif |
915d7e5e DL |
478 | out_unregister_genl: |
479 | genl_unregister_family(&seg6_genl_family); | |
480 | goto out; | |
481 | } | |
482 | ||
483 | void seg6_exit(void) | |
484 | { | |
4f4853dc DL |
485 | #ifdef CONFIG_IPV6_SEG6_HMAC |
486 | seg6_hmac_exit(); | |
487 | #endif | |
46738b13 | 488 | #ifdef CONFIG_IPV6_SEG6_LWTUNNEL |
6c8702c6 | 489 | seg6_iptunnel_exit(); |
46738b13 | 490 | #endif |
915d7e5e DL |
491 | unregister_pernet_subsys(&ip6_segments_ops); |
492 | genl_unregister_family(&seg6_genl_family); | |
493 | } |