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14#include <linux/errno.h>
15#include <linux/types.h>
16#include <linux/socket.h>
17#include <linux/net.h>
18#include <linux/in6.h>
19#include <linux/slab.h>
20
21#include <net/ipv6.h>
22#include <net/protocol.h>
23
24#include <net/seg6.h>
25#include <net/genetlink.h>
26#include <linux/seg6.h>
27#include <linux/seg6_genl.h>
28#ifdef CONFIG_IPV6_SEG6_HMAC
29#include <net/seg6_hmac.h>
30#endif
31
32bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len)
33{
34 int trailing;
35 unsigned int tlv_offset;
36
37 if (srh->type != IPV6_SRCRT_TYPE_4)
38 return false;
39
40 if (((srh->hdrlen + 1) << 3) != len)
41 return false;
42
43 if (srh->segments_left > srh->first_segment)
44 return false;
45
46 tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);
47
48 trailing = len - tlv_offset;
49 if (trailing < 0)
50 return false;
51
52 while (trailing) {
53 struct sr6_tlv *tlv;
54 unsigned int tlv_len;
55
56 if (trailing < sizeof(*tlv))
57 return false;
58
59 tlv = (struct sr6_tlv *)((unsigned char *)srh + tlv_offset);
60 tlv_len = sizeof(*tlv) + tlv->len;
61
62 trailing -= tlv_len;
63 if (trailing < 0)
64 return false;
65
66 tlv_offset += tlv_len;
67 }
68
69 return true;
70}
71
72static struct genl_family seg6_genl_family;
73
74static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
75 [SEG6_ATTR_DST] = { .type = NLA_BINARY,
76 .len = sizeof(struct in6_addr) },
77 [SEG6_ATTR_DSTLEN] = { .type = NLA_S32, },
78 [SEG6_ATTR_HMACKEYID] = { .type = NLA_U32, },
79 [SEG6_ATTR_SECRET] = { .type = NLA_BINARY, },
80 [SEG6_ATTR_SECRETLEN] = { .type = NLA_U8, },
81 [SEG6_ATTR_ALGID] = { .type = NLA_U8, },
82 [SEG6_ATTR_HMACINFO] = { .type = NLA_NESTED, },
83};
84
85#ifdef CONFIG_IPV6_SEG6_HMAC
86
87static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
88{
89 struct net *net = genl_info_net(info);
90 struct seg6_pernet_data *sdata;
91 struct seg6_hmac_info *hinfo;
92 u32 hmackeyid;
93 char *secret;
94 int err = 0;
95 u8 algid;
96 u8 slen;
97
98 sdata = seg6_pernet(net);
99
100 if (!info->attrs[SEG6_ATTR_HMACKEYID] ||
101 !info->attrs[SEG6_ATTR_SECRETLEN] ||
102 !info->attrs[SEG6_ATTR_ALGID])
103 return -EINVAL;
104
105 hmackeyid = nla_get_u32(info->attrs[SEG6_ATTR_HMACKEYID]);
106 slen = nla_get_u8(info->attrs[SEG6_ATTR_SECRETLEN]);
107 algid = nla_get_u8(info->attrs[SEG6_ATTR_ALGID]);
108
109 if (hmackeyid == 0)
110 return -EINVAL;
111
112 if (slen > SEG6_HMAC_SECRET_LEN)
113 return -EINVAL;
114
115 mutex_lock(&sdata->lock);
116 hinfo = seg6_hmac_info_lookup(net, hmackeyid);
117
118 if (!slen) {
119 if (!hinfo)
120 err = -ENOENT;
121
122 err = seg6_hmac_info_del(net, hmackeyid);
123
124 goto out_unlock;
125 }
126
127 if (!info->attrs[SEG6_ATTR_SECRET]) {
128 err = -EINVAL;
129 goto out_unlock;
130 }
131
132 if (hinfo) {
133 err = seg6_hmac_info_del(net, hmackeyid);
134 if (err)
135 goto out_unlock;
136 }
137
138 secret = (char *)nla_data(info->attrs[SEG6_ATTR_SECRET]);
139
140 hinfo = kzalloc(sizeof(*hinfo), GFP_KERNEL);
141 if (!hinfo) {
142 err = -ENOMEM;
143 goto out_unlock;
144 }
145
146 memcpy(hinfo->secret, secret, slen);
147 hinfo->slen = slen;
148 hinfo->alg_id = algid;
149 hinfo->hmackeyid = hmackeyid;
150
151 err = seg6_hmac_info_add(net, hmackeyid, hinfo);
152 if (err)
153 kfree(hinfo);
154
155out_unlock:
156 mutex_unlock(&sdata->lock);
157 return err;
158}
159
160#else
161
162static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
163{
164 return -ENOTSUPP;
165}
166
167#endif
168
169static int seg6_genl_set_tunsrc(struct sk_buff *skb, struct genl_info *info)
170{
171 struct net *net = genl_info_net(info);
172 struct in6_addr *val, *t_old, *t_new;
173 struct seg6_pernet_data *sdata;
174
175 sdata = seg6_pernet(net);
176
177 if (!info->attrs[SEG6_ATTR_DST])
178 return -EINVAL;
179
180 val = nla_data(info->attrs[SEG6_ATTR_DST]);
181 t_new = kmemdup(val, sizeof(*val), GFP_KERNEL);
182 if (!t_new)
183 return -ENOMEM;
184
185 mutex_lock(&sdata->lock);
186
187 t_old = sdata->tun_src;
188 rcu_assign_pointer(sdata->tun_src, t_new);
189
190 mutex_unlock(&sdata->lock);
191
192 synchronize_net();
193 kfree(t_old);
194
195 return 0;
196}
197
198static int seg6_genl_get_tunsrc(struct sk_buff *skb, struct genl_info *info)
199{
200 struct net *net = genl_info_net(info);
201 struct in6_addr *tun_src;
202 struct sk_buff *msg;
203 void *hdr;
204
205 msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
206 if (!msg)
207 return -ENOMEM;
208
209 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
210 &seg6_genl_family, 0, SEG6_CMD_GET_TUNSRC);
211 if (!hdr)
212 goto free_msg;
213
214 rcu_read_lock();
215 tun_src = rcu_dereference(seg6_pernet(net)->tun_src);
216
217 if (nla_put(msg, SEG6_ATTR_DST, sizeof(struct in6_addr), tun_src))
218 goto nla_put_failure;
219
220 rcu_read_unlock();
221
222 genlmsg_end(msg, hdr);
223 genlmsg_reply(msg, info);
224
225 return 0;
226
227nla_put_failure:
228 rcu_read_unlock();
229 genlmsg_cancel(msg, hdr);
230free_msg:
231 nlmsg_free(msg);
232 return -ENOMEM;
233}
234
235#ifdef CONFIG_IPV6_SEG6_HMAC
236
237static int __seg6_hmac_fill_info(struct seg6_hmac_info *hinfo,
238 struct sk_buff *msg)
239{
240 if (nla_put_u32(msg, SEG6_ATTR_HMACKEYID, hinfo->hmackeyid) ||
241 nla_put_u8(msg, SEG6_ATTR_SECRETLEN, hinfo->slen) ||
242 nla_put(msg, SEG6_ATTR_SECRET, hinfo->slen, hinfo->secret) ||
243 nla_put_u8(msg, SEG6_ATTR_ALGID, hinfo->alg_id))
244 return -1;
245
246 return 0;
247}
248
249static int __seg6_genl_dumphmac_element(struct seg6_hmac_info *hinfo,
250 u32 portid, u32 seq, u32 flags,
251 struct sk_buff *skb, u8 cmd)
252{
253 void *hdr;
254
255 hdr = genlmsg_put(skb, portid, seq, &seg6_genl_family, flags, cmd);
256 if (!hdr)
257 return -ENOMEM;
258
259 if (__seg6_hmac_fill_info(hinfo, skb) < 0)
260 goto nla_put_failure;
261
262 genlmsg_end(skb, hdr);
263 return 0;
264
265nla_put_failure:
266 genlmsg_cancel(skb, hdr);
267 return -EMSGSIZE;
268}
269
270static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
271{
272 struct net *net = sock_net(cb->skb->sk);
273 struct seg6_pernet_data *sdata;
274 struct rhashtable_iter *iter;
275
276 sdata = seg6_pernet(net);
277 iter = (struct rhashtable_iter *)cb->args[0];
278
279 if (!iter) {
280 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
281 if (!iter)
282 return -ENOMEM;
283
284 cb->args[0] = (long)iter;
285 }
286
287 rhashtable_walk_enter(&sdata->hmac_infos, iter);
288
289 return 0;
290}
291
292static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
293{
294 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
295
296 rhashtable_walk_exit(iter);
297
298 kfree(iter);
299
300 return 0;
301}
302
303static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
304{
305 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
306 struct seg6_hmac_info *hinfo;
307 int ret;
308
309 ret = rhashtable_walk_start(iter);
310 if (ret && ret != -EAGAIN)
311 goto done;
312
313 for (;;) {
314 hinfo = rhashtable_walk_next(iter);
315
316 if (IS_ERR(hinfo)) {
317 if (PTR_ERR(hinfo) == -EAGAIN)
318 continue;
319 ret = PTR_ERR(hinfo);
320 goto done;
321 } else if (!hinfo) {
322 break;
323 }
324
325 ret = __seg6_genl_dumphmac_element(hinfo,
326 NETLINK_CB(cb->skb).portid,
327 cb->nlh->nlmsg_seq,
328 NLM_F_MULTI,
329 skb, SEG6_CMD_DUMPHMAC);
330 if (ret)
331 goto done;
332 }
333
334 ret = skb->len;
335
336done:
337 rhashtable_walk_stop(iter);
338 return ret;
339}
340
341#else
342
343static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
344{
345 return 0;
346}
347
348static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
349{
350 return 0;
351}
352
353static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
354{
355 return -ENOTSUPP;
356}
357
358#endif
359
360static int __net_init seg6_net_init(struct net *net)
361{
362 struct seg6_pernet_data *sdata;
363
364 sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
365 if (!sdata)
366 return -ENOMEM;
367
368 mutex_init(&sdata->lock);
369
370 sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
371 if (!sdata->tun_src) {
372 kfree(sdata);
373 return -ENOMEM;
374 }
375
376 net->ipv6.seg6_data = sdata;
377
378#ifdef CONFIG_IPV6_SEG6_HMAC
379 seg6_hmac_net_init(net);
380#endif
381
382 return 0;
383}
384
385static void __net_exit seg6_net_exit(struct net *net)
386{
387 struct seg6_pernet_data *sdata = seg6_pernet(net);
388
389#ifdef CONFIG_IPV6_SEG6_HMAC
390 seg6_hmac_net_exit(net);
391#endif
392
393 kfree(sdata->tun_src);
394 kfree(sdata);
395}
396
397static struct pernet_operations ip6_segments_ops = {
398 .init = seg6_net_init,
399 .exit = seg6_net_exit,
400};
401
402static const struct genl_ops seg6_genl_ops[] = {
403 {
404 .cmd = SEG6_CMD_SETHMAC,
405 .doit = seg6_genl_sethmac,
406 .policy = seg6_genl_policy,
407 .flags = GENL_ADMIN_PERM,
408 },
409 {
410 .cmd = SEG6_CMD_DUMPHMAC,
411 .start = seg6_genl_dumphmac_start,
412 .dumpit = seg6_genl_dumphmac,
413 .done = seg6_genl_dumphmac_done,
414 .policy = seg6_genl_policy,
415 .flags = GENL_ADMIN_PERM,
416 },
417 {
418 .cmd = SEG6_CMD_SET_TUNSRC,
419 .doit = seg6_genl_set_tunsrc,
420 .policy = seg6_genl_policy,
421 .flags = GENL_ADMIN_PERM,
422 },
423 {
424 .cmd = SEG6_CMD_GET_TUNSRC,
425 .doit = seg6_genl_get_tunsrc,
426 .policy = seg6_genl_policy,
427 .flags = GENL_ADMIN_PERM,
428 },
429};
430
431static struct genl_family seg6_genl_family __ro_after_init = {
432 .hdrsize = 0,
433 .name = SEG6_GENL_NAME,
434 .version = SEG6_GENL_VERSION,
435 .maxattr = SEG6_ATTR_MAX,
436 .netnsok = true,
437 .parallel_ops = true,
438 .ops = seg6_genl_ops,
439 .n_ops = ARRAY_SIZE(seg6_genl_ops),
440 .module = THIS_MODULE,
441};
442
443int __init seg6_init(void)
444{
445 int err = -ENOMEM;
446
447 err = genl_register_family(&seg6_genl_family);
448 if (err)
449 goto out;
450
451 err = register_pernet_subsys(&ip6_segments_ops);
452 if (err)
453 goto out_unregister_genl;
454
455#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
456 err = seg6_iptunnel_init();
457 if (err)
458 goto out_unregister_pernet;
459
460 err = seg6_local_init();
461 if (err)
462 goto out_unregister_pernet;
463#endif
464
465#ifdef CONFIG_IPV6_SEG6_HMAC
466 err = seg6_hmac_init();
467 if (err)
468 goto out_unregister_iptun;
469#endif
470
471 pr_info("Segment Routing with IPv6\n");
472
473out:
474 return err;
475#ifdef CONFIG_IPV6_SEG6_HMAC
476out_unregister_iptun:
477#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
478 seg6_local_exit();
479 seg6_iptunnel_exit();
480#endif
481#endif
482#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
483out_unregister_pernet:
484 unregister_pernet_subsys(&ip6_segments_ops);
485#endif
486out_unregister_genl:
487 genl_unregister_family(&seg6_genl_family);
488 goto out;
489}
490
491void seg6_exit(void)
492{
493#ifdef CONFIG_IPV6_SEG6_HMAC
494 seg6_hmac_exit();
495#endif
496#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
497 seg6_iptunnel_exit();
498#endif
499 unregister_pernet_subsys(&ip6_segments_ops);
500 genl_unregister_family(&seg6_genl_family);
501}
502
