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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * SR-IPv6 implementation
4 *
5 * Author:
6 * David Lebrun <david.lebrun@uclouvain.be>
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>
15#include <linux/rhashtable.h>
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>
24#ifdef CONFIG_IPV6_SEG6_HMAC
25#include <net/seg6_hmac.h>
26#endif
27
28bool 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
39 if (srh->segments_left > srh->first_segment)
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
52 if (trailing < sizeof(*tlv))
53 return false;
54
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
68static struct genl_family seg6_genl_family;
69
70static 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
81#ifdef CONFIG_IPV6_SEG6_HMAC
82
83static 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
151out_unlock:
152 mutex_unlock(&sdata->lock);
153 return err;
154}
155
156#else
157
158static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
159{
160 return -ENOTSUPP;
161}
162
163#endif
164
165static 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);
178 if (!t_new)
179 return -ENOMEM;
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
194static 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);
219 return genlmsg_reply(msg, info);
220
221nla_put_failure:
222 rcu_read_unlock();
223free_msg:
224 nlmsg_free(msg);
225 return -ENOMEM;
226}
227
228#ifdef CONFIG_IPV6_SEG6_HMAC
229
230static 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
242static 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
258nla_put_failure:
259 genlmsg_cancel(skb, hdr);
260 return -EMSGSIZE;
261}
262
263static 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
285static 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
296static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
297{
298 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
299 struct seg6_hmac_info *hinfo;
300 int ret;
301
302 rhashtable_walk_start(iter);
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
327done:
328 rhashtable_walk_stop(iter);
329 return ret;
330}
331
332#else
333
334static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
335{
336 return 0;
337}
338
339static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
340{
341 return 0;
342}
343
344static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
345{
346 return -ENOTSUPP;
347}
348
349#endif
350
351static 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
369#ifdef CONFIG_IPV6_SEG6_HMAC
370 seg6_hmac_net_init(net);
371#endif
372
373 return 0;
374}
375
376static void __net_exit seg6_net_exit(struct net *net)
377{
378 struct seg6_pernet_data *sdata = seg6_pernet(net);
379
380#ifdef CONFIG_IPV6_SEG6_HMAC
381 seg6_hmac_net_exit(net);
382#endif
383
384 kfree(sdata->tun_src);
385 kfree(sdata);
386}
387
388static struct pernet_operations ip6_segments_ops = {
389 .init = seg6_net_init,
390 .exit = seg6_net_exit,
391};
392
393static const struct genl_ops seg6_genl_ops[] = {
394 {
395 .cmd = SEG6_CMD_SETHMAC,
396 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
397 .doit = seg6_genl_sethmac,
398 .flags = GENL_ADMIN_PERM,
399 },
400 {
401 .cmd = SEG6_CMD_DUMPHMAC,
402 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
403 .start = seg6_genl_dumphmac_start,
404 .dumpit = seg6_genl_dumphmac,
405 .done = seg6_genl_dumphmac_done,
406 .flags = GENL_ADMIN_PERM,
407 },
408 {
409 .cmd = SEG6_CMD_SET_TUNSRC,
410 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
411 .doit = seg6_genl_set_tunsrc,
412 .flags = GENL_ADMIN_PERM,
413 },
414 {
415 .cmd = SEG6_CMD_GET_TUNSRC,
416 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
417 .doit = seg6_genl_get_tunsrc,
418 .flags = GENL_ADMIN_PERM,
419 },
420};
421
422static 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,
427 .policy = seg6_genl_policy,
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
435int __init seg6_init(void)
436{
437 int err = -ENOMEM;
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
447#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
448 err = seg6_iptunnel_init();
449 if (err)
450 goto out_unregister_pernet;
451
452 err = seg6_local_init();
453 if (err)
454 goto out_unregister_pernet;
455#endif
456
457#ifdef CONFIG_IPV6_SEG6_HMAC
458 err = seg6_hmac_init();
459 if (err)
460 goto out_unregister_iptun;
461#endif
462
463 pr_info("Segment Routing with IPv6\n");
464
465out:
466 return err;
467#ifdef CONFIG_IPV6_SEG6_HMAC
468out_unregister_iptun:
469#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
470 seg6_local_exit();
471 seg6_iptunnel_exit();
472#endif
473#endif
474#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
475out_unregister_pernet:
476 unregister_pernet_subsys(&ip6_segments_ops);
477#endif
478out_unregister_genl:
479 genl_unregister_family(&seg6_genl_family);
480 goto out;
481}
482
483void seg6_exit(void)
484{
485#ifdef CONFIG_IPV6_SEG6_HMAC
486 seg6_hmac_exit();
487#endif
488#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
489 seg6_iptunnel_exit();
490#endif
491 unregister_pernet_subsys(&ip6_segments_ops);
492 genl_unregister_family(&seg6_genl_family);
493}