1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * SR-IPv6 implementation
6 * David Lebrun <david.lebrun@uclouvain.be>
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>
18 #include <net/protocol.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>
28 bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced)
30 unsigned int tlv_offset;
34 if (srh->type != IPV6_SRCRT_TYPE_4)
37 if (((srh->hdrlen + 1) << 3) != len)
40 if (!reduced && srh->segments_left > srh->first_segment) {
43 max_last_entry = (srh->hdrlen / 2) - 1;
45 if (srh->first_segment > max_last_entry)
48 if (srh->segments_left > srh->first_segment + 1)
52 tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);
54 trailing = len - tlv_offset;
62 if (trailing < sizeof(*tlv))
65 tlv = (struct sr6_tlv *)((unsigned char *)srh + tlv_offset);
66 tlv_len = sizeof(*tlv) + tlv->len;
72 tlv_offset += tlv_len;
78 static struct genl_family seg6_genl_family;
80 static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
81 [SEG6_ATTR_DST] = { .type = NLA_BINARY,
82 .len = sizeof(struct in6_addr) },
83 [SEG6_ATTR_DSTLEN] = { .type = NLA_S32, },
84 [SEG6_ATTR_HMACKEYID] = { .type = NLA_U32, },
85 [SEG6_ATTR_SECRET] = { .type = NLA_BINARY, },
86 [SEG6_ATTR_SECRETLEN] = { .type = NLA_U8, },
87 [SEG6_ATTR_ALGID] = { .type = NLA_U8, },
88 [SEG6_ATTR_HMACINFO] = { .type = NLA_NESTED, },
91 #ifdef CONFIG_IPV6_SEG6_HMAC
93 static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
95 struct net *net = genl_info_net(info);
96 struct seg6_pernet_data *sdata;
97 struct seg6_hmac_info *hinfo;
104 sdata = seg6_pernet(net);
106 if (!info->attrs[SEG6_ATTR_HMACKEYID] ||
107 !info->attrs[SEG6_ATTR_SECRETLEN] ||
108 !info->attrs[SEG6_ATTR_ALGID])
111 hmackeyid = nla_get_u32(info->attrs[SEG6_ATTR_HMACKEYID]);
112 slen = nla_get_u8(info->attrs[SEG6_ATTR_SECRETLEN]);
113 algid = nla_get_u8(info->attrs[SEG6_ATTR_ALGID]);
118 if (slen > SEG6_HMAC_SECRET_LEN)
121 mutex_lock(&sdata->lock);
122 hinfo = seg6_hmac_info_lookup(net, hmackeyid);
128 err = seg6_hmac_info_del(net, hmackeyid);
133 if (!info->attrs[SEG6_ATTR_SECRET]) {
138 if (slen > nla_len(info->attrs[SEG6_ATTR_SECRET])) {
144 err = seg6_hmac_info_del(net, hmackeyid);
149 secret = (char *)nla_data(info->attrs[SEG6_ATTR_SECRET]);
151 hinfo = kzalloc(sizeof(*hinfo), GFP_KERNEL);
157 memcpy(hinfo->secret, secret, slen);
159 hinfo->alg_id = algid;
160 hinfo->hmackeyid = hmackeyid;
162 err = seg6_hmac_info_add(net, hmackeyid, hinfo);
167 mutex_unlock(&sdata->lock);
173 static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
180 static int seg6_genl_set_tunsrc(struct sk_buff *skb, struct genl_info *info)
182 struct net *net = genl_info_net(info);
183 struct in6_addr *val, *t_old, *t_new;
184 struct seg6_pernet_data *sdata;
186 sdata = seg6_pernet(net);
188 if (!info->attrs[SEG6_ATTR_DST])
191 val = nla_data(info->attrs[SEG6_ATTR_DST]);
192 t_new = kmemdup(val, sizeof(*val), GFP_KERNEL);
196 mutex_lock(&sdata->lock);
198 t_old = sdata->tun_src;
199 rcu_assign_pointer(sdata->tun_src, t_new);
201 mutex_unlock(&sdata->lock);
209 static int seg6_genl_get_tunsrc(struct sk_buff *skb, struct genl_info *info)
211 struct net *net = genl_info_net(info);
212 struct in6_addr *tun_src;
216 msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
220 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
221 &seg6_genl_family, 0, SEG6_CMD_GET_TUNSRC);
226 tun_src = rcu_dereference(seg6_pernet(net)->tun_src);
228 if (nla_put(msg, SEG6_ATTR_DST, sizeof(struct in6_addr), tun_src))
229 goto nla_put_failure;
233 genlmsg_end(msg, hdr);
234 return genlmsg_reply(msg, info);
243 #ifdef CONFIG_IPV6_SEG6_HMAC
245 static int __seg6_hmac_fill_info(struct seg6_hmac_info *hinfo,
248 if (nla_put_u32(msg, SEG6_ATTR_HMACKEYID, hinfo->hmackeyid) ||
249 nla_put_u8(msg, SEG6_ATTR_SECRETLEN, hinfo->slen) ||
250 nla_put(msg, SEG6_ATTR_SECRET, hinfo->slen, hinfo->secret) ||
251 nla_put_u8(msg, SEG6_ATTR_ALGID, hinfo->alg_id))
257 static int __seg6_genl_dumphmac_element(struct seg6_hmac_info *hinfo,
258 u32 portid, u32 seq, u32 flags,
259 struct sk_buff *skb, u8 cmd)
263 hdr = genlmsg_put(skb, portid, seq, &seg6_genl_family, flags, cmd);
267 if (__seg6_hmac_fill_info(hinfo, skb) < 0)
268 goto nla_put_failure;
270 genlmsg_end(skb, hdr);
274 genlmsg_cancel(skb, hdr);
278 static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
280 struct net *net = sock_net(cb->skb->sk);
281 struct seg6_pernet_data *sdata;
282 struct rhashtable_iter *iter;
284 sdata = seg6_pernet(net);
285 iter = (struct rhashtable_iter *)cb->args[0];
288 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
292 cb->args[0] = (long)iter;
295 rhashtable_walk_enter(&sdata->hmac_infos, iter);
300 static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
302 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
304 rhashtable_walk_exit(iter);
311 static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
313 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
314 struct seg6_hmac_info *hinfo;
317 rhashtable_walk_start(iter);
320 hinfo = rhashtable_walk_next(iter);
323 if (PTR_ERR(hinfo) == -EAGAIN)
325 ret = PTR_ERR(hinfo);
331 ret = __seg6_genl_dumphmac_element(hinfo,
332 NETLINK_CB(cb->skb).portid,
335 skb, SEG6_CMD_DUMPHMAC);
343 rhashtable_walk_stop(iter);
349 static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
354 static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
359 static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
366 static int __net_init seg6_net_init(struct net *net)
368 struct seg6_pernet_data *sdata;
370 sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
374 mutex_init(&sdata->lock);
376 sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
377 if (!sdata->tun_src) {
382 net->ipv6.seg6_data = sdata;
384 #ifdef CONFIG_IPV6_SEG6_HMAC
385 seg6_hmac_net_init(net);
391 static void __net_exit seg6_net_exit(struct net *net)
393 struct seg6_pernet_data *sdata = seg6_pernet(net);
395 #ifdef CONFIG_IPV6_SEG6_HMAC
396 seg6_hmac_net_exit(net);
399 kfree(sdata->tun_src);
403 static struct pernet_operations ip6_segments_ops = {
404 .init = seg6_net_init,
405 .exit = seg6_net_exit,
408 static const struct genl_ops seg6_genl_ops[] = {
410 .cmd = SEG6_CMD_SETHMAC,
411 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
412 .doit = seg6_genl_sethmac,
413 .flags = GENL_ADMIN_PERM,
416 .cmd = SEG6_CMD_DUMPHMAC,
417 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
418 .start = seg6_genl_dumphmac_start,
419 .dumpit = seg6_genl_dumphmac,
420 .done = seg6_genl_dumphmac_done,
421 .flags = GENL_ADMIN_PERM,
424 .cmd = SEG6_CMD_SET_TUNSRC,
425 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
426 .doit = seg6_genl_set_tunsrc,
427 .flags = GENL_ADMIN_PERM,
430 .cmd = SEG6_CMD_GET_TUNSRC,
431 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
432 .doit = seg6_genl_get_tunsrc,
433 .flags = GENL_ADMIN_PERM,
437 static struct genl_family seg6_genl_family __ro_after_init = {
439 .name = SEG6_GENL_NAME,
440 .version = SEG6_GENL_VERSION,
441 .maxattr = SEG6_ATTR_MAX,
442 .policy = seg6_genl_policy,
444 .parallel_ops = true,
445 .ops = seg6_genl_ops,
446 .n_ops = ARRAY_SIZE(seg6_genl_ops),
447 .module = THIS_MODULE,
450 int __init seg6_init(void)
454 err = register_pernet_subsys(&ip6_segments_ops);
458 err = genl_register_family(&seg6_genl_family);
460 goto out_unregister_pernet;
462 #ifdef CONFIG_IPV6_SEG6_LWTUNNEL
463 err = seg6_iptunnel_init();
465 goto out_unregister_genl;
467 err = seg6_local_init();
469 seg6_iptunnel_exit();
470 goto out_unregister_genl;
474 #ifdef CONFIG_IPV6_SEG6_HMAC
475 err = seg6_hmac_init();
477 goto out_unregister_iptun;
480 pr_info("Segment Routing with IPv6\n");
484 #ifdef CONFIG_IPV6_SEG6_HMAC
485 out_unregister_iptun:
486 #ifdef CONFIG_IPV6_SEG6_LWTUNNEL
488 seg6_iptunnel_exit();
491 #ifdef CONFIG_IPV6_SEG6_LWTUNNEL
493 genl_unregister_family(&seg6_genl_family);
495 out_unregister_pernet:
496 unregister_pernet_subsys(&ip6_segments_ops);
502 #ifdef CONFIG_IPV6_SEG6_HMAC
505 #ifdef CONFIG_IPV6_SEG6_LWTUNNEL
506 seg6_iptunnel_exit();
508 unregister_pernet_subsys(&ip6_segments_ops);
509 genl_unregister_family(&seg6_genl_family);