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1/*
2 * SR-IPv6 implementation
3 *
4 * Author:
5 * David Lebrun <david.lebrun@uclouvain.be>
6 *
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
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 rhashtable_walk_start(iter);
310
311 for (;;) {
312 hinfo = rhashtable_walk_next(iter);
313
314 if (IS_ERR(hinfo)) {
315 if (PTR_ERR(hinfo) == -EAGAIN)
316 continue;
317 ret = PTR_ERR(hinfo);
318 goto done;
319 } else if (!hinfo) {
320 break;
321 }
322
323 ret = __seg6_genl_dumphmac_element(hinfo,
324 NETLINK_CB(cb->skb).portid,
325 cb->nlh->nlmsg_seq,
326 NLM_F_MULTI,
327 skb, SEG6_CMD_DUMPHMAC);
328 if (ret)
329 goto done;
330 }
331
332 ret = skb->len;
333
334done:
335 rhashtable_walk_stop(iter);
336 return ret;
337}
338
339#else
340
341static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
342{
343 return 0;
344}
345
346static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
347{
348 return 0;
349}
350
351static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
352{
353 return -ENOTSUPP;
354}
355
356#endif
357
358static int __net_init seg6_net_init(struct net *net)
359{
360 struct seg6_pernet_data *sdata;
361
362 sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
363 if (!sdata)
364 return -ENOMEM;
365
366 mutex_init(&sdata->lock);
367
368 sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
369 if (!sdata->tun_src) {
370 kfree(sdata);
371 return -ENOMEM;
372 }
373
374 net->ipv6.seg6_data = sdata;
375
376#ifdef CONFIG_IPV6_SEG6_HMAC
377 seg6_hmac_net_init(net);
378#endif
379
380 return 0;
381}
382
383static void __net_exit seg6_net_exit(struct net *net)
384{
385 struct seg6_pernet_data *sdata = seg6_pernet(net);
386
387#ifdef CONFIG_IPV6_SEG6_HMAC
388 seg6_hmac_net_exit(net);
389#endif
390
391 kfree(sdata->tun_src);
392 kfree(sdata);
393}
394
395static struct pernet_operations ip6_segments_ops = {
396 .init = seg6_net_init,
397 .exit = seg6_net_exit,
398};
399
400static const struct genl_ops seg6_genl_ops[] = {
401 {
402 .cmd = SEG6_CMD_SETHMAC,
403 .doit = seg6_genl_sethmac,
404 .policy = seg6_genl_policy,
405 .flags = GENL_ADMIN_PERM,
406 },
407 {
408 .cmd = SEG6_CMD_DUMPHMAC,
409 .start = seg6_genl_dumphmac_start,
410 .dumpit = seg6_genl_dumphmac,
411 .done = seg6_genl_dumphmac_done,
412 .policy = seg6_genl_policy,
413 .flags = GENL_ADMIN_PERM,
414 },
415 {
416 .cmd = SEG6_CMD_SET_TUNSRC,
417 .doit = seg6_genl_set_tunsrc,
418 .policy = seg6_genl_policy,
419 .flags = GENL_ADMIN_PERM,
420 },
421 {
422 .cmd = SEG6_CMD_GET_TUNSRC,
423 .doit = seg6_genl_get_tunsrc,
424 .policy = seg6_genl_policy,
425 .flags = GENL_ADMIN_PERM,
426 },
427};
428
429static struct genl_family seg6_genl_family __ro_after_init = {
430 .hdrsize = 0,
431 .name = SEG6_GENL_NAME,
432 .version = SEG6_GENL_VERSION,
433 .maxattr = SEG6_ATTR_MAX,
434 .netnsok = true,
435 .parallel_ops = true,
436 .ops = seg6_genl_ops,
437 .n_ops = ARRAY_SIZE(seg6_genl_ops),
438 .module = THIS_MODULE,
439};
440
441int __init seg6_init(void)
442{
443 int err = -ENOMEM;
444
445 err = genl_register_family(&seg6_genl_family);
446 if (err)
447 goto out;
448
449 err = register_pernet_subsys(&ip6_segments_ops);
450 if (err)
451 goto out_unregister_genl;
452
453#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
454 err = seg6_iptunnel_init();
455 if (err)
456 goto out_unregister_pernet;
457
458 err = seg6_local_init();
459 if (err)
460 goto out_unregister_pernet;
461#endif
462
463#ifdef CONFIG_IPV6_SEG6_HMAC
464 err = seg6_hmac_init();
465 if (err)
466 goto out_unregister_iptun;
467#endif
468
469 pr_info("Segment Routing with IPv6\n");
470
471out:
472 return err;
473#ifdef CONFIG_IPV6_SEG6_HMAC
474out_unregister_iptun:
475#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
476 seg6_local_exit();
477 seg6_iptunnel_exit();
478#endif
479#endif
480#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
481out_unregister_pernet:
482 unregister_pernet_subsys(&ip6_segments_ops);
483#endif
484out_unregister_genl:
485 genl_unregister_family(&seg6_genl_family);
486 goto out;
487}
488
489void seg6_exit(void)
490{
491#ifdef CONFIG_IPV6_SEG6_HMAC
492 seg6_hmac_exit();
493#endif
494#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
495 seg6_iptunnel_exit();
496#endif
497 unregister_pernet_subsys(&ip6_segments_ops);
498 genl_unregister_family(&seg6_genl_family);
499}
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#include <net/seg6_hmac.h>
25
26bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced)
27{
28 unsigned int tlv_offset;
29 int max_last_entry;
30 int trailing;
31
32 if (srh->type != IPV6_SRCRT_TYPE_4)
33 return false;
34
35 if (((srh->hdrlen + 1) << 3) != len)
36 return false;
37
38 if (!reduced && srh->segments_left > srh->first_segment) {
39 return false;
40 } else {
41 max_last_entry = (srh->hdrlen / 2) - 1;
42
43 if (srh->first_segment > max_last_entry)
44 return false;
45
46 if (srh->segments_left > srh->first_segment + 1)
47 return false;
48 }
49
50 tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);
51
52 trailing = len - tlv_offset;
53 if (trailing < 0)
54 return false;
55
56 while (trailing) {
57 struct sr6_tlv *tlv;
58 unsigned int tlv_len;
59
60 if (trailing < sizeof(*tlv))
61 return false;
62
63 tlv = (struct sr6_tlv *)((unsigned char *)srh + tlv_offset);
64 tlv_len = sizeof(*tlv) + tlv->len;
65
66 trailing -= tlv_len;
67 if (trailing < 0)
68 return false;
69
70 tlv_offset += tlv_len;
71 }
72
73 return true;
74}
75
76struct ipv6_sr_hdr *seg6_get_srh(struct sk_buff *skb, int flags)
77{
78 struct ipv6_sr_hdr *srh;
79 int len, srhoff = 0;
80
81 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, &flags) < 0)
82 return NULL;
83
84 if (!pskb_may_pull(skb, srhoff + sizeof(*srh)))
85 return NULL;
86
87 srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
88
89 len = (srh->hdrlen + 1) << 3;
90
91 if (!pskb_may_pull(skb, srhoff + len))
92 return NULL;
93
94 /* note that pskb_may_pull may change pointers in header;
95 * for this reason it is necessary to reload them when needed.
96 */
97 srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
98
99 if (!seg6_validate_srh(srh, len, true))
100 return NULL;
101
102 return srh;
103}
104
105/* Determine if an ICMP invoking packet contains a segment routing
106 * header. If it does, extract the offset to the true destination
107 * address, which is in the first segment address.
108 */
109void seg6_icmp_srh(struct sk_buff *skb, struct inet6_skb_parm *opt)
110{
111 __u16 network_header = skb->network_header;
112 struct ipv6_sr_hdr *srh;
113
114 /* Update network header to point to the invoking packet
115 * inside the ICMP packet, so we can use the seg6_get_srh()
116 * helper.
117 */
118 skb_reset_network_header(skb);
119
120 srh = seg6_get_srh(skb, 0);
121 if (!srh)
122 goto out;
123
124 if (srh->type != IPV6_SRCRT_TYPE_4)
125 goto out;
126
127 opt->flags |= IP6SKB_SEG6;
128 opt->srhoff = (unsigned char *)srh - skb->data;
129
130out:
131 /* Restore the network header back to the ICMP packet */
132 skb->network_header = network_header;
133}
134
135static struct genl_family seg6_genl_family;
136
137static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
138 [SEG6_ATTR_DST] = { .type = NLA_BINARY,
139 .len = sizeof(struct in6_addr) },
140 [SEG6_ATTR_DSTLEN] = { .type = NLA_S32, },
141 [SEG6_ATTR_HMACKEYID] = { .type = NLA_U32, },
142 [SEG6_ATTR_SECRET] = { .type = NLA_BINARY, },
143 [SEG6_ATTR_SECRETLEN] = { .type = NLA_U8, },
144 [SEG6_ATTR_ALGID] = { .type = NLA_U8, },
145 [SEG6_ATTR_HMACINFO] = { .type = NLA_NESTED, },
146};
147
148#ifdef CONFIG_IPV6_SEG6_HMAC
149
150static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
151{
152 struct net *net = genl_info_net(info);
153 struct seg6_pernet_data *sdata;
154 struct seg6_hmac_info *hinfo;
155 u32 hmackeyid;
156 char *secret;
157 int err = 0;
158 u8 algid;
159 u8 slen;
160
161 sdata = seg6_pernet(net);
162
163 if (!info->attrs[SEG6_ATTR_HMACKEYID] ||
164 !info->attrs[SEG6_ATTR_SECRETLEN] ||
165 !info->attrs[SEG6_ATTR_ALGID])
166 return -EINVAL;
167
168 hmackeyid = nla_get_u32(info->attrs[SEG6_ATTR_HMACKEYID]);
169 slen = nla_get_u8(info->attrs[SEG6_ATTR_SECRETLEN]);
170 algid = nla_get_u8(info->attrs[SEG6_ATTR_ALGID]);
171
172 if (hmackeyid == 0)
173 return -EINVAL;
174
175 if (slen > SEG6_HMAC_SECRET_LEN)
176 return -EINVAL;
177
178 mutex_lock(&sdata->lock);
179 hinfo = seg6_hmac_info_lookup(net, hmackeyid);
180
181 if (!slen) {
182 err = seg6_hmac_info_del(net, hmackeyid);
183
184 goto out_unlock;
185 }
186
187 if (!info->attrs[SEG6_ATTR_SECRET]) {
188 err = -EINVAL;
189 goto out_unlock;
190 }
191
192 if (slen > nla_len(info->attrs[SEG6_ATTR_SECRET])) {
193 err = -EINVAL;
194 goto out_unlock;
195 }
196
197 if (hinfo) {
198 err = seg6_hmac_info_del(net, hmackeyid);
199 if (err)
200 goto out_unlock;
201 }
202
203 secret = (char *)nla_data(info->attrs[SEG6_ATTR_SECRET]);
204
205 hinfo = kzalloc(sizeof(*hinfo), GFP_KERNEL);
206 if (!hinfo) {
207 err = -ENOMEM;
208 goto out_unlock;
209 }
210
211 memcpy(hinfo->secret, secret, slen);
212 hinfo->slen = slen;
213 hinfo->alg_id = algid;
214 hinfo->hmackeyid = hmackeyid;
215
216 err = seg6_hmac_info_add(net, hmackeyid, hinfo);
217 if (err)
218 kfree(hinfo);
219
220out_unlock:
221 mutex_unlock(&sdata->lock);
222 return err;
223}
224
225#else
226
227static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
228{
229 return -ENOTSUPP;
230}
231
232#endif
233
234static int seg6_genl_set_tunsrc(struct sk_buff *skb, struct genl_info *info)
235{
236 struct net *net = genl_info_net(info);
237 struct in6_addr *val, *t_old, *t_new;
238 struct seg6_pernet_data *sdata;
239
240 sdata = seg6_pernet(net);
241
242 if (!info->attrs[SEG6_ATTR_DST])
243 return -EINVAL;
244
245 val = nla_data(info->attrs[SEG6_ATTR_DST]);
246 t_new = kmemdup(val, sizeof(*val), GFP_KERNEL);
247 if (!t_new)
248 return -ENOMEM;
249
250 mutex_lock(&sdata->lock);
251
252 t_old = sdata->tun_src;
253 rcu_assign_pointer(sdata->tun_src, t_new);
254
255 mutex_unlock(&sdata->lock);
256
257 synchronize_net();
258 kfree(t_old);
259
260 return 0;
261}
262
263static int seg6_genl_get_tunsrc(struct sk_buff *skb, struct genl_info *info)
264{
265 struct net *net = genl_info_net(info);
266 struct in6_addr *tun_src;
267 struct sk_buff *msg;
268 void *hdr;
269
270 msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
271 if (!msg)
272 return -ENOMEM;
273
274 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
275 &seg6_genl_family, 0, SEG6_CMD_GET_TUNSRC);
276 if (!hdr)
277 goto free_msg;
278
279 rcu_read_lock();
280 tun_src = rcu_dereference(seg6_pernet(net)->tun_src);
281
282 if (nla_put(msg, SEG6_ATTR_DST, sizeof(struct in6_addr), tun_src))
283 goto nla_put_failure;
284
285 rcu_read_unlock();
286
287 genlmsg_end(msg, hdr);
288 return genlmsg_reply(msg, info);
289
290nla_put_failure:
291 rcu_read_unlock();
292free_msg:
293 nlmsg_free(msg);
294 return -ENOMEM;
295}
296
297#ifdef CONFIG_IPV6_SEG6_HMAC
298
299static int __seg6_hmac_fill_info(struct seg6_hmac_info *hinfo,
300 struct sk_buff *msg)
301{
302 if (nla_put_u32(msg, SEG6_ATTR_HMACKEYID, hinfo->hmackeyid) ||
303 nla_put_u8(msg, SEG6_ATTR_SECRETLEN, hinfo->slen) ||
304 nla_put(msg, SEG6_ATTR_SECRET, hinfo->slen, hinfo->secret) ||
305 nla_put_u8(msg, SEG6_ATTR_ALGID, hinfo->alg_id))
306 return -1;
307
308 return 0;
309}
310
311static int __seg6_genl_dumphmac_element(struct seg6_hmac_info *hinfo,
312 u32 portid, u32 seq, u32 flags,
313 struct sk_buff *skb, u8 cmd)
314{
315 void *hdr;
316
317 hdr = genlmsg_put(skb, portid, seq, &seg6_genl_family, flags, cmd);
318 if (!hdr)
319 return -ENOMEM;
320
321 if (__seg6_hmac_fill_info(hinfo, skb) < 0)
322 goto nla_put_failure;
323
324 genlmsg_end(skb, hdr);
325 return 0;
326
327nla_put_failure:
328 genlmsg_cancel(skb, hdr);
329 return -EMSGSIZE;
330}
331
332static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
333{
334 struct net *net = sock_net(cb->skb->sk);
335 struct seg6_pernet_data *sdata;
336 struct rhashtable_iter *iter;
337
338 sdata = seg6_pernet(net);
339 iter = (struct rhashtable_iter *)cb->args[0];
340
341 if (!iter) {
342 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
343 if (!iter)
344 return -ENOMEM;
345
346 cb->args[0] = (long)iter;
347 }
348
349 rhashtable_walk_enter(&sdata->hmac_infos, iter);
350
351 return 0;
352}
353
354static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
355{
356 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
357
358 rhashtable_walk_exit(iter);
359
360 kfree(iter);
361
362 return 0;
363}
364
365static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
366{
367 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
368 struct seg6_hmac_info *hinfo;
369 int ret;
370
371 rhashtable_walk_start(iter);
372
373 for (;;) {
374 hinfo = rhashtable_walk_next(iter);
375
376 if (IS_ERR(hinfo)) {
377 if (PTR_ERR(hinfo) == -EAGAIN)
378 continue;
379 ret = PTR_ERR(hinfo);
380 goto done;
381 } else if (!hinfo) {
382 break;
383 }
384
385 ret = __seg6_genl_dumphmac_element(hinfo,
386 NETLINK_CB(cb->skb).portid,
387 cb->nlh->nlmsg_seq,
388 NLM_F_MULTI,
389 skb, SEG6_CMD_DUMPHMAC);
390 if (ret)
391 goto done;
392 }
393
394 ret = skb->len;
395
396done:
397 rhashtable_walk_stop(iter);
398 return ret;
399}
400
401#else
402
403static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
404{
405 return 0;
406}
407
408static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
409{
410 return 0;
411}
412
413static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
414{
415 return -ENOTSUPP;
416}
417
418#endif
419
420static int __net_init seg6_net_init(struct net *net)
421{
422 struct seg6_pernet_data *sdata;
423
424 sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
425 if (!sdata)
426 return -ENOMEM;
427
428 mutex_init(&sdata->lock);
429
430 sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
431 if (!sdata->tun_src) {
432 kfree(sdata);
433 return -ENOMEM;
434 }
435
436 net->ipv6.seg6_data = sdata;
437
438 if (seg6_hmac_net_init(net)) {
439 kfree(rcu_dereference_raw(sdata->tun_src));
440 kfree(sdata);
441 return -ENOMEM;
442 }
443
444 return 0;
445}
446
447static void __net_exit seg6_net_exit(struct net *net)
448{
449 struct seg6_pernet_data *sdata = seg6_pernet(net);
450
451 seg6_hmac_net_exit(net);
452
453 kfree(rcu_dereference_raw(sdata->tun_src));
454 kfree(sdata);
455}
456
457static struct pernet_operations ip6_segments_ops = {
458 .init = seg6_net_init,
459 .exit = seg6_net_exit,
460};
461
462static const struct genl_ops seg6_genl_ops[] = {
463 {
464 .cmd = SEG6_CMD_SETHMAC,
465 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
466 .doit = seg6_genl_sethmac,
467 .flags = GENL_ADMIN_PERM,
468 },
469 {
470 .cmd = SEG6_CMD_DUMPHMAC,
471 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
472 .start = seg6_genl_dumphmac_start,
473 .dumpit = seg6_genl_dumphmac,
474 .done = seg6_genl_dumphmac_done,
475 .flags = GENL_ADMIN_PERM,
476 },
477 {
478 .cmd = SEG6_CMD_SET_TUNSRC,
479 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
480 .doit = seg6_genl_set_tunsrc,
481 .flags = GENL_ADMIN_PERM,
482 },
483 {
484 .cmd = SEG6_CMD_GET_TUNSRC,
485 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
486 .doit = seg6_genl_get_tunsrc,
487 .flags = GENL_ADMIN_PERM,
488 },
489};
490
491static struct genl_family seg6_genl_family __ro_after_init = {
492 .hdrsize = 0,
493 .name = SEG6_GENL_NAME,
494 .version = SEG6_GENL_VERSION,
495 .maxattr = SEG6_ATTR_MAX,
496 .policy = seg6_genl_policy,
497 .netnsok = true,
498 .parallel_ops = true,
499 .ops = seg6_genl_ops,
500 .n_ops = ARRAY_SIZE(seg6_genl_ops),
501 .resv_start_op = SEG6_CMD_GET_TUNSRC + 1,
502 .module = THIS_MODULE,
503};
504
505int __init seg6_init(void)
506{
507 int err;
508
509 err = register_pernet_subsys(&ip6_segments_ops);
510 if (err)
511 goto out;
512
513 err = genl_register_family(&seg6_genl_family);
514 if (err)
515 goto out_unregister_pernet;
516
517 err = seg6_iptunnel_init();
518 if (err)
519 goto out_unregister_genl;
520
521 err = seg6_local_init();
522 if (err)
523 goto out_unregister_iptun;
524
525 err = seg6_hmac_init();
526 if (err)
527 goto out_unregister_seg6;
528
529 pr_info("Segment Routing with IPv6\n");
530
531out:
532 return err;
533out_unregister_seg6:
534 seg6_local_exit();
535out_unregister_iptun:
536 seg6_iptunnel_exit();
537out_unregister_genl:
538 genl_unregister_family(&seg6_genl_family);
539out_unregister_pernet:
540 unregister_pernet_subsys(&ip6_segments_ops);
541 goto out;
542}
543
544void seg6_exit(void)
545{
546 seg6_hmac_exit();
547 seg6_local_exit();
548 seg6_iptunnel_exit();
549 genl_unregister_family(&seg6_genl_family);
550 unregister_pernet_subsys(&ip6_segments_ops);
551}