2 * SR-IPv6 implementation
5 * David Lebrun <david.lebrun@uclouvain.be>
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.
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 #include <linux/rhashtable.h>
23 #include <net/protocol.h>
26 #include <net/genetlink.h>
27 #include <linux/seg6.h>
28 #include <linux/seg6_genl.h>
29 #ifdef CONFIG_IPV6_SEG6_HMAC
30 #include <net/seg6_hmac.h>
33 bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len)
36 unsigned int tlv_offset;
38 if (srh->type != IPV6_SRCRT_TYPE_4)
41 if (((srh->hdrlen + 1) << 3) != len)
44 if (srh->segments_left > srh->first_segment)
47 tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);
49 trailing = len - tlv_offset;
57 if (trailing < sizeof(*tlv))
60 tlv = (struct sr6_tlv *)((unsigned char *)srh + tlv_offset);
61 tlv_len = sizeof(*tlv) + tlv->len;
67 tlv_offset += tlv_len;
73 static struct genl_family seg6_genl_family;
75 static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
76 [SEG6_ATTR_DST] = { .type = NLA_BINARY,
77 .len = sizeof(struct in6_addr) },
78 [SEG6_ATTR_DSTLEN] = { .type = NLA_S32, },
79 [SEG6_ATTR_HMACKEYID] = { .type = NLA_U32, },
80 [SEG6_ATTR_SECRET] = { .type = NLA_BINARY, },
81 [SEG6_ATTR_SECRETLEN] = { .type = NLA_U8, },
82 [SEG6_ATTR_ALGID] = { .type = NLA_U8, },
83 [SEG6_ATTR_HMACINFO] = { .type = NLA_NESTED, },
86 #ifdef CONFIG_IPV6_SEG6_HMAC
88 static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
90 struct net *net = genl_info_net(info);
91 struct seg6_pernet_data *sdata;
92 struct seg6_hmac_info *hinfo;
99 sdata = seg6_pernet(net);
101 if (!info->attrs[SEG6_ATTR_HMACKEYID] ||
102 !info->attrs[SEG6_ATTR_SECRETLEN] ||
103 !info->attrs[SEG6_ATTR_ALGID])
106 hmackeyid = nla_get_u32(info->attrs[SEG6_ATTR_HMACKEYID]);
107 slen = nla_get_u8(info->attrs[SEG6_ATTR_SECRETLEN]);
108 algid = nla_get_u8(info->attrs[SEG6_ATTR_ALGID]);
113 if (slen > SEG6_HMAC_SECRET_LEN)
116 mutex_lock(&sdata->lock);
117 hinfo = seg6_hmac_info_lookup(net, hmackeyid);
123 err = seg6_hmac_info_del(net, hmackeyid);
128 if (!info->attrs[SEG6_ATTR_SECRET]) {
133 if (slen > nla_len(info->attrs[SEG6_ATTR_SECRET])) {
139 err = seg6_hmac_info_del(net, hmackeyid);
144 secret = (char *)nla_data(info->attrs[SEG6_ATTR_SECRET]);
146 hinfo = kzalloc(sizeof(*hinfo), GFP_KERNEL);
152 memcpy(hinfo->secret, secret, slen);
154 hinfo->alg_id = algid;
155 hinfo->hmackeyid = hmackeyid;
157 err = seg6_hmac_info_add(net, hmackeyid, hinfo);
162 mutex_unlock(&sdata->lock);
168 static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
175 static int seg6_genl_set_tunsrc(struct sk_buff *skb, struct genl_info *info)
177 struct net *net = genl_info_net(info);
178 struct in6_addr *val, *t_old, *t_new;
179 struct seg6_pernet_data *sdata;
181 sdata = seg6_pernet(net);
183 if (!info->attrs[SEG6_ATTR_DST])
186 val = nla_data(info->attrs[SEG6_ATTR_DST]);
187 t_new = kmemdup(val, sizeof(*val), GFP_KERNEL);
191 mutex_lock(&sdata->lock);
193 t_old = sdata->tun_src;
194 rcu_assign_pointer(sdata->tun_src, t_new);
196 mutex_unlock(&sdata->lock);
204 static int seg6_genl_get_tunsrc(struct sk_buff *skb, struct genl_info *info)
206 struct net *net = genl_info_net(info);
207 struct in6_addr *tun_src;
211 msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
215 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
216 &seg6_genl_family, 0, SEG6_CMD_GET_TUNSRC);
221 tun_src = rcu_dereference(seg6_pernet(net)->tun_src);
223 if (nla_put(msg, SEG6_ATTR_DST, sizeof(struct in6_addr), tun_src))
224 goto nla_put_failure;
228 genlmsg_end(msg, hdr);
229 return genlmsg_reply(msg, info);
238 #ifdef CONFIG_IPV6_SEG6_HMAC
240 static int __seg6_hmac_fill_info(struct seg6_hmac_info *hinfo,
243 if (nla_put_u32(msg, SEG6_ATTR_HMACKEYID, hinfo->hmackeyid) ||
244 nla_put_u8(msg, SEG6_ATTR_SECRETLEN, hinfo->slen) ||
245 nla_put(msg, SEG6_ATTR_SECRET, hinfo->slen, hinfo->secret) ||
246 nla_put_u8(msg, SEG6_ATTR_ALGID, hinfo->alg_id))
252 static int __seg6_genl_dumphmac_element(struct seg6_hmac_info *hinfo,
253 u32 portid, u32 seq, u32 flags,
254 struct sk_buff *skb, u8 cmd)
258 hdr = genlmsg_put(skb, portid, seq, &seg6_genl_family, flags, cmd);
262 if (__seg6_hmac_fill_info(hinfo, skb) < 0)
263 goto nla_put_failure;
265 genlmsg_end(skb, hdr);
269 genlmsg_cancel(skb, hdr);
273 static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
275 struct net *net = sock_net(cb->skb->sk);
276 struct seg6_pernet_data *sdata;
277 struct rhashtable_iter *iter;
279 sdata = seg6_pernet(net);
280 iter = (struct rhashtable_iter *)cb->args[0];
283 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
287 cb->args[0] = (long)iter;
290 rhashtable_walk_enter(&sdata->hmac_infos, iter);
295 static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
297 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
299 rhashtable_walk_exit(iter);
306 static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
308 struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
309 struct seg6_hmac_info *hinfo;
312 rhashtable_walk_start(iter);
315 hinfo = rhashtable_walk_next(iter);
318 if (PTR_ERR(hinfo) == -EAGAIN)
320 ret = PTR_ERR(hinfo);
326 ret = __seg6_genl_dumphmac_element(hinfo,
327 NETLINK_CB(cb->skb).portid,
330 skb, SEG6_CMD_DUMPHMAC);
338 rhashtable_walk_stop(iter);
344 static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
349 static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
354 static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
361 static int __net_init seg6_net_init(struct net *net)
363 struct seg6_pernet_data *sdata;
365 sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
369 mutex_init(&sdata->lock);
371 sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
372 if (!sdata->tun_src) {
377 net->ipv6.seg6_data = sdata;
379 #ifdef CONFIG_IPV6_SEG6_HMAC
380 seg6_hmac_net_init(net);
386 static void __net_exit seg6_net_exit(struct net *net)
388 struct seg6_pernet_data *sdata = seg6_pernet(net);
390 #ifdef CONFIG_IPV6_SEG6_HMAC
391 seg6_hmac_net_exit(net);
394 kfree(sdata->tun_src);
398 static struct pernet_operations ip6_segments_ops = {
399 .init = seg6_net_init,
400 .exit = seg6_net_exit,
403 static const struct genl_ops seg6_genl_ops[] = {
405 .cmd = SEG6_CMD_SETHMAC,
406 .doit = seg6_genl_sethmac,
407 .policy = seg6_genl_policy,
408 .flags = GENL_ADMIN_PERM,
411 .cmd = SEG6_CMD_DUMPHMAC,
412 .start = seg6_genl_dumphmac_start,
413 .dumpit = seg6_genl_dumphmac,
414 .done = seg6_genl_dumphmac_done,
415 .policy = seg6_genl_policy,
416 .flags = GENL_ADMIN_PERM,
419 .cmd = SEG6_CMD_SET_TUNSRC,
420 .doit = seg6_genl_set_tunsrc,
421 .policy = seg6_genl_policy,
422 .flags = GENL_ADMIN_PERM,
425 .cmd = SEG6_CMD_GET_TUNSRC,
426 .doit = seg6_genl_get_tunsrc,
427 .policy = seg6_genl_policy,
428 .flags = GENL_ADMIN_PERM,
432 static struct genl_family seg6_genl_family __ro_after_init = {
434 .name = SEG6_GENL_NAME,
435 .version = SEG6_GENL_VERSION,
436 .maxattr = SEG6_ATTR_MAX,
438 .parallel_ops = true,
439 .ops = seg6_genl_ops,
440 .n_ops = ARRAY_SIZE(seg6_genl_ops),
441 .module = THIS_MODULE,
444 int __init seg6_init(void)
448 err = genl_register_family(&seg6_genl_family);
452 err = register_pernet_subsys(&ip6_segments_ops);
454 goto out_unregister_genl;
456 #ifdef CONFIG_IPV6_SEG6_LWTUNNEL
457 err = seg6_iptunnel_init();
459 goto out_unregister_pernet;
461 err = seg6_local_init();
463 goto out_unregister_pernet;
466 #ifdef CONFIG_IPV6_SEG6_HMAC
467 err = seg6_hmac_init();
469 goto out_unregister_iptun;
472 pr_info("Segment Routing with IPv6\n");
476 #ifdef CONFIG_IPV6_SEG6_HMAC
477 out_unregister_iptun:
478 #ifdef CONFIG_IPV6_SEG6_LWTUNNEL
480 seg6_iptunnel_exit();
483 #ifdef CONFIG_IPV6_SEG6_LWTUNNEL
484 out_unregister_pernet:
485 unregister_pernet_subsys(&ip6_segments_ops);
488 genl_unregister_family(&seg6_genl_family);
494 #ifdef CONFIG_IPV6_SEG6_HMAC
497 #ifdef CONFIG_IPV6_SEG6_LWTUNNEL
498 seg6_iptunnel_exit();
500 unregister_pernet_subsys(&ip6_segments_ops);
501 genl_unregister_family(&seg6_genl_family);