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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, bool reduced)
29{
30 unsigned int tlv_offset;
31 int max_last_entry;
32 int trailing;
33
34 if (srh->type != IPV6_SRCRT_TYPE_4)
35 return false;
36
37 if (((srh->hdrlen + 1) << 3) != len)
38 return false;
39
40 if (!reduced && srh->segments_left > srh->first_segment) {
41 return false;
42 } else {
43 max_last_entry = (srh->hdrlen / 2) - 1;
44
45 if (srh->first_segment > max_last_entry)
46 return false;
47
48 if (srh->segments_left > srh->first_segment + 1)
49 return false;
50 }
51
52 tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);
53
54 trailing = len - tlv_offset;
55 if (trailing < 0)
56 return false;
57
58 while (trailing) {
59 struct sr6_tlv *tlv;
60 unsigned int tlv_len;
61
62 if (trailing < sizeof(*tlv))
63 return false;
64
65 tlv = (struct sr6_tlv *)((unsigned char *)srh + tlv_offset);
66 tlv_len = sizeof(*tlv) + tlv->len;
67
68 trailing -= tlv_len;
69 if (trailing < 0)
70 return false;
71
72 tlv_offset += tlv_len;
73 }
74
75 return true;
76}
77
78struct ipv6_sr_hdr *seg6_get_srh(struct sk_buff *skb, int flags)
79{
80 struct ipv6_sr_hdr *srh;
81 int len, srhoff = 0;
82
83 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, &flags) < 0)
84 return NULL;
85
86 if (!pskb_may_pull(skb, srhoff + sizeof(*srh)))
87 return NULL;
88
89 srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
90
91 len = (srh->hdrlen + 1) << 3;
92
93 if (!pskb_may_pull(skb, srhoff + len))
94 return NULL;
95
96 /* note that pskb_may_pull may change pointers in header;
97 * for this reason it is necessary to reload them when needed.
98 */
99 srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
100
101 if (!seg6_validate_srh(srh, len, true))
102 return NULL;
103
104 return srh;
105}
106
107/* Determine if an ICMP invoking packet contains a segment routing
108 * header. If it does, extract the offset to the true destination
109 * address, which is in the first segment address.
110 */
111void seg6_icmp_srh(struct sk_buff *skb, struct inet6_skb_parm *opt)
112{
113 __u16 network_header = skb->network_header;
114 struct ipv6_sr_hdr *srh;
115
116 /* Update network header to point to the invoking packet
117 * inside the ICMP packet, so we can use the seg6_get_srh()
118 * helper.
119 */
120 skb_reset_network_header(skb);
121
122 srh = seg6_get_srh(skb, 0);
123 if (!srh)
124 goto out;
125
126 if (srh->type != IPV6_SRCRT_TYPE_4)
127 goto out;
128
129 opt->flags |= IP6SKB_SEG6;
130 opt->srhoff = (unsigned char *)srh - skb->data;
131
132out:
133 /* Restore the network header back to the ICMP packet */
134 skb->network_header = network_header;
135}
136
137static struct genl_family seg6_genl_family;
138
139static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
140 [SEG6_ATTR_DST] = { .type = NLA_BINARY,
141 .len = sizeof(struct in6_addr) },
142 [SEG6_ATTR_DSTLEN] = { .type = NLA_S32, },
143 [SEG6_ATTR_HMACKEYID] = { .type = NLA_U32, },
144 [SEG6_ATTR_SECRET] = { .type = NLA_BINARY, },
145 [SEG6_ATTR_SECRETLEN] = { .type = NLA_U8, },
146 [SEG6_ATTR_ALGID] = { .type = NLA_U8, },
147 [SEG6_ATTR_HMACINFO] = { .type = NLA_NESTED, },
148};
149
150#ifdef CONFIG_IPV6_SEG6_HMAC
151
152static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
153{
154 struct net *net = genl_info_net(info);
155 struct seg6_pernet_data *sdata;
156 struct seg6_hmac_info *hinfo;
157 u32 hmackeyid;
158 char *secret;
159 int err = 0;
160 u8 algid;
161 u8 slen;
162
163 sdata = seg6_pernet(net);
164
165 if (!info->attrs[SEG6_ATTR_HMACKEYID] ||
166 !info->attrs[SEG6_ATTR_SECRETLEN] ||
167 !info->attrs[SEG6_ATTR_ALGID])
168 return -EINVAL;
169
170 hmackeyid = nla_get_u32(info->attrs[SEG6_ATTR_HMACKEYID]);
171 slen = nla_get_u8(info->attrs[SEG6_ATTR_SECRETLEN]);
172 algid = nla_get_u8(info->attrs[SEG6_ATTR_ALGID]);
173
174 if (hmackeyid == 0)
175 return -EINVAL;
176
177 if (slen > SEG6_HMAC_SECRET_LEN)
178 return -EINVAL;
179
180 mutex_lock(&sdata->lock);
181 hinfo = seg6_hmac_info_lookup(net, hmackeyid);
182
183 if (!slen) {
184 err = seg6_hmac_info_del(net, hmackeyid);
185
186 goto out_unlock;
187 }
188
189 if (!info->attrs[SEG6_ATTR_SECRET]) {
190 err = -EINVAL;
191 goto out_unlock;
192 }
193
194 if (slen > nla_len(info->attrs[SEG6_ATTR_SECRET])) {
195 err = -EINVAL;
196 goto out_unlock;
197 }
198
199 if (hinfo) {
200 err = seg6_hmac_info_del(net, hmackeyid);
201 if (err)
202 goto out_unlock;
203 }
204
205 secret = (char *)nla_data(info->attrs[SEG6_ATTR_SECRET]);
206
207 hinfo = kzalloc(sizeof(*hinfo), GFP_KERNEL);
208 if (!hinfo) {
209 err = -ENOMEM;
210 goto out_unlock;
211 }
212
213 memcpy(hinfo->secret, secret, slen);
214 hinfo->slen = slen;
215 hinfo->alg_id = algid;
216 hinfo->hmackeyid = hmackeyid;
217
218 err = seg6_hmac_info_add(net, hmackeyid, hinfo);
219 if (err)
220 kfree(hinfo);
221
222out_unlock:
223 mutex_unlock(&sdata->lock);
224 return err;
225}
226
227#else
228
229static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
230{
231 return -ENOTSUPP;
232}
233
234#endif
235
236static int seg6_genl_set_tunsrc(struct sk_buff *skb, struct genl_info *info)
237{
238 struct net *net = genl_info_net(info);
239 struct in6_addr *val, *t_old, *t_new;
240 struct seg6_pernet_data *sdata;
241
242 sdata = seg6_pernet(net);
243
244 if (!info->attrs[SEG6_ATTR_DST])
245 return -EINVAL;
246
247 val = nla_data(info->attrs[SEG6_ATTR_DST]);
248 t_new = kmemdup(val, sizeof(*val), GFP_KERNEL);
249 if (!t_new)
250 return -ENOMEM;
251
252 mutex_lock(&sdata->lock);
253
254 t_old = sdata->tun_src;
255 rcu_assign_pointer(sdata->tun_src, t_new);
256
257 mutex_unlock(&sdata->lock);
258
259 synchronize_net();
260 kfree(t_old);
261
262 return 0;
263}
264
265static int seg6_genl_get_tunsrc(struct sk_buff *skb, struct genl_info *info)
266{
267 struct net *net = genl_info_net(info);
268 struct in6_addr *tun_src;
269 struct sk_buff *msg;
270 void *hdr;
271
272 msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
273 if (!msg)
274 return -ENOMEM;
275
276 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
277 &seg6_genl_family, 0, SEG6_CMD_GET_TUNSRC);
278 if (!hdr)
279 goto free_msg;
280
281 rcu_read_lock();
282 tun_src = rcu_dereference(seg6_pernet(net)->tun_src);
283
284 if (nla_put(msg, SEG6_ATTR_DST, sizeof(struct in6_addr), tun_src))
285 goto nla_put_failure;
286
287 rcu_read_unlock();
288
289 genlmsg_end(msg, hdr);
290 return genlmsg_reply(msg, info);
291
292nla_put_failure:
293 rcu_read_unlock();
294free_msg:
295 nlmsg_free(msg);
296 return -ENOMEM;
297}
298
299#ifdef CONFIG_IPV6_SEG6_HMAC
300
301static int __seg6_hmac_fill_info(struct seg6_hmac_info *hinfo,
302 struct sk_buff *msg)
303{
304 if (nla_put_u32(msg, SEG6_ATTR_HMACKEYID, hinfo->hmackeyid) ||
305 nla_put_u8(msg, SEG6_ATTR_SECRETLEN, hinfo->slen) ||
306 nla_put(msg, SEG6_ATTR_SECRET, hinfo->slen, hinfo->secret) ||
307 nla_put_u8(msg, SEG6_ATTR_ALGID, hinfo->alg_id))
308 return -1;
309
310 return 0;
311}
312
313static int __seg6_genl_dumphmac_element(struct seg6_hmac_info *hinfo,
314 u32 portid, u32 seq, u32 flags,
315 struct sk_buff *skb, u8 cmd)
316{
317 void *hdr;
318
319 hdr = genlmsg_put(skb, portid, seq, &seg6_genl_family, flags, cmd);
320 if (!hdr)
321 return -ENOMEM;
322
323 if (__seg6_hmac_fill_info(hinfo, skb) < 0)
324 goto nla_put_failure;
325
326 genlmsg_end(skb, hdr);
327 return 0;
328
329nla_put_failure:
330 genlmsg_cancel(skb, hdr);
331 return -EMSGSIZE;
332}
333
334static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
335{
336 struct net *net = sock_net(cb->skb->sk);
337 struct seg6_pernet_data *sdata;
338 struct rhashtable_iter *iter;
339
340 sdata = seg6_pernet(net);
341 iter = (struct rhashtable_iter *)cb->args[0];
342
343 if (!iter) {
344 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
345 if (!iter)
346 return -ENOMEM;
347
348 cb->args[0] = (long)iter;
349 }
350
351 rhashtable_walk_enter(&sdata->hmac_infos, iter);
352
353 return 0;
354}
355
356static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
357{
358 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
359
360 rhashtable_walk_exit(iter);
361
362 kfree(iter);
363
364 return 0;
365}
366
367static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
368{
369 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
370 struct seg6_hmac_info *hinfo;
371 int ret;
372
373 rhashtable_walk_start(iter);
374
375 for (;;) {
376 hinfo = rhashtable_walk_next(iter);
377
378 if (IS_ERR(hinfo)) {
379 if (PTR_ERR(hinfo) == -EAGAIN)
380 continue;
381 ret = PTR_ERR(hinfo);
382 goto done;
383 } else if (!hinfo) {
384 break;
385 }
386
387 ret = __seg6_genl_dumphmac_element(hinfo,
388 NETLINK_CB(cb->skb).portid,
389 cb->nlh->nlmsg_seq,
390 NLM_F_MULTI,
391 skb, SEG6_CMD_DUMPHMAC);
392 if (ret)
393 goto done;
394 }
395
396 ret = skb->len;
397
398done:
399 rhashtable_walk_stop(iter);
400 return ret;
401}
402
403#else
404
405static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
406{
407 return 0;
408}
409
410static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
411{
412 return 0;
413}
414
415static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
416{
417 return -ENOTSUPP;
418}
419
420#endif
421
422static int __net_init seg6_net_init(struct net *net)
423{
424 struct seg6_pernet_data *sdata;
425
426 sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
427 if (!sdata)
428 return -ENOMEM;
429
430 mutex_init(&sdata->lock);
431
432 sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
433 if (!sdata->tun_src) {
434 kfree(sdata);
435 return -ENOMEM;
436 }
437
438 net->ipv6.seg6_data = sdata;
439
440#ifdef CONFIG_IPV6_SEG6_HMAC
441 if (seg6_hmac_net_init(net)) {
442 kfree(rcu_dereference_raw(sdata->tun_src));
443 kfree(sdata);
444 return -ENOMEM;
445 }
446#endif
447
448 return 0;
449}
450
451static void __net_exit seg6_net_exit(struct net *net)
452{
453 struct seg6_pernet_data *sdata = seg6_pernet(net);
454
455#ifdef CONFIG_IPV6_SEG6_HMAC
456 seg6_hmac_net_exit(net);
457#endif
458
459 kfree(rcu_dereference_raw(sdata->tun_src));
460 kfree(sdata);
461}
462
463static struct pernet_operations ip6_segments_ops = {
464 .init = seg6_net_init,
465 .exit = seg6_net_exit,
466};
467
468static const struct genl_ops seg6_genl_ops[] = {
469 {
470 .cmd = SEG6_CMD_SETHMAC,
471 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
472 .doit = seg6_genl_sethmac,
473 .flags = GENL_ADMIN_PERM,
474 },
475 {
476 .cmd = SEG6_CMD_DUMPHMAC,
477 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
478 .start = seg6_genl_dumphmac_start,
479 .dumpit = seg6_genl_dumphmac,
480 .done = seg6_genl_dumphmac_done,
481 .flags = GENL_ADMIN_PERM,
482 },
483 {
484 .cmd = SEG6_CMD_SET_TUNSRC,
485 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
486 .doit = seg6_genl_set_tunsrc,
487 .flags = GENL_ADMIN_PERM,
488 },
489 {
490 .cmd = SEG6_CMD_GET_TUNSRC,
491 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
492 .doit = seg6_genl_get_tunsrc,
493 .flags = GENL_ADMIN_PERM,
494 },
495};
496
497static struct genl_family seg6_genl_family __ro_after_init = {
498 .hdrsize = 0,
499 .name = SEG6_GENL_NAME,
500 .version = SEG6_GENL_VERSION,
501 .maxattr = SEG6_ATTR_MAX,
502 .policy = seg6_genl_policy,
503 .netnsok = true,
504 .parallel_ops = true,
505 .ops = seg6_genl_ops,
506 .n_ops = ARRAY_SIZE(seg6_genl_ops),
507 .resv_start_op = SEG6_CMD_GET_TUNSRC + 1,
508 .module = THIS_MODULE,
509};
510
511int __init seg6_init(void)
512{
513 int err;
514
515 err = register_pernet_subsys(&ip6_segments_ops);
516 if (err)
517 goto out;
518
519 err = genl_register_family(&seg6_genl_family);
520 if (err)
521 goto out_unregister_pernet;
522
523#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
524 err = seg6_iptunnel_init();
525 if (err)
526 goto out_unregister_genl;
527
528 err = seg6_local_init();
529 if (err) {
530 seg6_iptunnel_exit();
531 goto out_unregister_genl;
532 }
533#endif
534
535#ifdef CONFIG_IPV6_SEG6_HMAC
536 err = seg6_hmac_init();
537 if (err)
538 goto out_unregister_iptun;
539#endif
540
541 pr_info("Segment Routing with IPv6\n");
542
543out:
544 return err;
545#ifdef CONFIG_IPV6_SEG6_HMAC
546out_unregister_iptun:
547#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
548 seg6_local_exit();
549 seg6_iptunnel_exit();
550#endif
551#endif
552#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
553out_unregister_genl:
554#endif
555#if IS_ENABLED(CONFIG_IPV6_SEG6_LWTUNNEL) || IS_ENABLED(CONFIG_IPV6_SEG6_HMAC)
556 genl_unregister_family(&seg6_genl_family);
557#endif
558out_unregister_pernet:
559 unregister_pernet_subsys(&ip6_segments_ops);
560 goto out;
561}
562
563void seg6_exit(void)
564{
565#ifdef CONFIG_IPV6_SEG6_HMAC
566 seg6_hmac_exit();
567#endif
568#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
569 seg6_local_exit();
570 seg6_iptunnel_exit();
571#endif
572 genl_unregister_family(&seg6_genl_family);
573 unregister_pernet_subsys(&ip6_segments_ops);
574}
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}