1
2
3
4
5
6
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/icmp.h>
11#include <linux/module.h>
12#include <linux/skbuff.h>
13#include <linux/random.h>
14#include <linux/socket.h>
15#include <linux/l2tp.h>
16#include <linux/in.h>
17#include <linux/in6.h>
18#include <net/sock.h>
19#include <net/ip.h>
20#include <net/icmp.h>
21#include <net/udp.h>
22#include <net/inet_common.h>
23#include <net/inet_hashtables.h>
24#include <net/inet6_hashtables.h>
25#include <net/tcp_states.h>
26#include <net/protocol.h>
27#include <net/xfrm.h>
28
29#include <net/transp_v6.h>
30#include <net/addrconf.h>
31#include <net/ip6_route.h>
32
33#include "l2tp_core.h"
34
35struct l2tp_ip6_sock {
36
37 struct inet_sock inet;
38
39 u32 conn_id;
40 u32 peer_conn_id;
41
42
43
44 struct ipv6_pinfo inet6;
45};
46
47static DEFINE_RWLOCK(l2tp_ip6_lock);
48static struct hlist_head l2tp_ip6_table;
49static struct hlist_head l2tp_ip6_bind_table;
50
51static inline struct l2tp_ip6_sock *l2tp_ip6_sk(const struct sock *sk)
52{
53 return (struct l2tp_ip6_sock *)sk;
54}
55
56static struct sock *__l2tp_ip6_bind_lookup(const struct net *net,
57 const struct in6_addr *laddr,
58 const struct in6_addr *raddr,
59 int dif, u32 tunnel_id)
60{
61 struct sock *sk;
62
63 sk_for_each_bound(sk, &l2tp_ip6_bind_table) {
64 const struct in6_addr *sk_laddr = inet6_rcv_saddr(sk);
65 const struct in6_addr *sk_raddr = &sk->sk_v6_daddr;
66 const struct l2tp_ip6_sock *l2tp = l2tp_ip6_sk(sk);
67
68 if (!net_eq(sock_net(sk), net))
69 continue;
70
71 if (sk->sk_bound_dev_if && dif && sk->sk_bound_dev_if != dif)
72 continue;
73
74 if (sk_laddr && !ipv6_addr_any(sk_laddr) &&
75 !ipv6_addr_any(laddr) && !ipv6_addr_equal(sk_laddr, laddr))
76 continue;
77
78 if (!ipv6_addr_any(sk_raddr) && raddr &&
79 !ipv6_addr_any(raddr) && !ipv6_addr_equal(sk_raddr, raddr))
80 continue;
81
82 if (l2tp->conn_id != tunnel_id)
83 continue;
84
85 goto found;
86 }
87
88 sk = NULL;
89found:
90 return sk;
91}
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126static int l2tp_ip6_recv(struct sk_buff *skb)
127{
128 struct net *net = dev_net(skb->dev);
129 struct sock *sk;
130 u32 session_id;
131 u32 tunnel_id;
132 unsigned char *ptr, *optr;
133 struct l2tp_session *session;
134 struct l2tp_tunnel *tunnel = NULL;
135 struct ipv6hdr *iph;
136 int length;
137
138 if (!pskb_may_pull(skb, 4))
139 goto discard;
140
141
142 optr = ptr = skb->data;
143 session_id = ntohl(*((__be32 *) ptr));
144 ptr += 4;
145
146
147
148
149
150 if (session_id == 0) {
151 __skb_pull(skb, 4);
152 goto pass_up;
153 }
154
155
156 session = l2tp_session_get(net, session_id);
157 if (!session)
158 goto discard;
159
160 tunnel = session->tunnel;
161 if (!tunnel)
162 goto discard_sess;
163
164
165 if (tunnel->debug & L2TP_MSG_DATA) {
166 length = min(32u, skb->len);
167 if (!pskb_may_pull(skb, length))
168 goto discard_sess;
169
170
171 optr = ptr = skb->data;
172 ptr += 4;
173 pr_debug("%s: ip recv\n", tunnel->name);
174 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
175 }
176
177 if (l2tp_v3_ensure_opt_in_linear(session, skb, &ptr, &optr))
178 goto discard_sess;
179
180 l2tp_recv_common(session, skb, ptr, optr, 0, skb->len);
181 l2tp_session_dec_refcount(session);
182
183 return 0;
184
185pass_up:
186
187 if (!pskb_may_pull(skb, 12))
188 goto discard;
189
190 if ((skb->data[0] & 0xc0) != 0xc0)
191 goto discard;
192
193 tunnel_id = ntohl(*(__be32 *) &skb->data[4]);
194 iph = ipv6_hdr(skb);
195
196 read_lock_bh(&l2tp_ip6_lock);
197 sk = __l2tp_ip6_bind_lookup(net, &iph->daddr, &iph->saddr,
198 inet6_iif(skb), tunnel_id);
199 if (!sk) {
200 read_unlock_bh(&l2tp_ip6_lock);
201 goto discard;
202 }
203 sock_hold(sk);
204 read_unlock_bh(&l2tp_ip6_lock);
205
206 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
207 goto discard_put;
208
209 nf_reset(skb);
210
211 return sk_receive_skb(sk, skb, 1);
212
213discard_sess:
214 l2tp_session_dec_refcount(session);
215 goto discard;
216
217discard_put:
218 sock_put(sk);
219
220discard:
221 kfree_skb(skb);
222 return 0;
223}
224
225static int l2tp_ip6_open(struct sock *sk)
226{
227
228 inet_sk(sk)->inet_num = IPPROTO_L2TP;
229
230 write_lock_bh(&l2tp_ip6_lock);
231 sk_add_node(sk, &l2tp_ip6_table);
232 write_unlock_bh(&l2tp_ip6_lock);
233
234 return 0;
235}
236
237static void l2tp_ip6_close(struct sock *sk, long timeout)
238{
239 write_lock_bh(&l2tp_ip6_lock);
240 hlist_del_init(&sk->sk_bind_node);
241 sk_del_node_init(sk);
242 write_unlock_bh(&l2tp_ip6_lock);
243
244 sk_common_release(sk);
245}
246
247static void l2tp_ip6_destroy_sock(struct sock *sk)
248{
249 struct l2tp_tunnel *tunnel = sk->sk_user_data;
250
251 lock_sock(sk);
252 ip6_flush_pending_frames(sk);
253 release_sock(sk);
254
255 if (tunnel)
256 l2tp_tunnel_delete(tunnel);
257
258 inet6_destroy_sock(sk);
259}
260
261static int l2tp_ip6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
262{
263 struct inet_sock *inet = inet_sk(sk);
264 struct ipv6_pinfo *np = inet6_sk(sk);
265 struct sockaddr_l2tpip6 *addr = (struct sockaddr_l2tpip6 *) uaddr;
266 struct net *net = sock_net(sk);
267 __be32 v4addr = 0;
268 int bound_dev_if;
269 int addr_type;
270 int err;
271
272 if (addr->l2tp_family != AF_INET6)
273 return -EINVAL;
274 if (addr_len < sizeof(*addr))
275 return -EINVAL;
276
277 addr_type = ipv6_addr_type(&addr->l2tp_addr);
278
279
280 if (addr_type == IPV6_ADDR_MAPPED)
281 return -EADDRNOTAVAIL;
282
283
284 if (addr_type & IPV6_ADDR_MULTICAST)
285 return -EADDRNOTAVAIL;
286
287 lock_sock(sk);
288
289 err = -EINVAL;
290 if (!sock_flag(sk, SOCK_ZAPPED))
291 goto out_unlock;
292
293 if (sk->sk_state != TCP_CLOSE)
294 goto out_unlock;
295
296 bound_dev_if = sk->sk_bound_dev_if;
297
298
299 rcu_read_lock();
300 if (addr_type != IPV6_ADDR_ANY) {
301 struct net_device *dev = NULL;
302
303 if (addr_type & IPV6_ADDR_LINKLOCAL) {
304 if (addr->l2tp_scope_id)
305 bound_dev_if = addr->l2tp_scope_id;
306
307
308
309
310 if (!bound_dev_if)
311 goto out_unlock_rcu;
312
313 err = -ENODEV;
314 dev = dev_get_by_index_rcu(sock_net(sk), bound_dev_if);
315 if (!dev)
316 goto out_unlock_rcu;
317 }
318
319
320
321
322 v4addr = LOOPBACK4_IPV6;
323 err = -EADDRNOTAVAIL;
324 if (!ipv6_chk_addr(sock_net(sk), &addr->l2tp_addr, dev, 0))
325 goto out_unlock_rcu;
326 }
327 rcu_read_unlock();
328
329 write_lock_bh(&l2tp_ip6_lock);
330 if (__l2tp_ip6_bind_lookup(net, &addr->l2tp_addr, NULL, bound_dev_if,
331 addr->l2tp_conn_id)) {
332 write_unlock_bh(&l2tp_ip6_lock);
333 err = -EADDRINUSE;
334 goto out_unlock;
335 }
336
337 inet->inet_saddr = v4addr;
338 inet->inet_rcv_saddr = v4addr;
339 sk->sk_bound_dev_if = bound_dev_if;
340 sk->sk_v6_rcv_saddr = addr->l2tp_addr;
341 np->saddr = addr->l2tp_addr;
342
343 l2tp_ip6_sk(sk)->conn_id = addr->l2tp_conn_id;
344
345 sk_add_bind_node(sk, &l2tp_ip6_bind_table);
346 sk_del_node_init(sk);
347 write_unlock_bh(&l2tp_ip6_lock);
348
349 sock_reset_flag(sk, SOCK_ZAPPED);
350 release_sock(sk);
351 return 0;
352
353out_unlock_rcu:
354 rcu_read_unlock();
355out_unlock:
356 release_sock(sk);
357
358 return err;
359}
360
361static int l2tp_ip6_connect(struct sock *sk, struct sockaddr *uaddr,
362 int addr_len)
363{
364 struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *) uaddr;
365 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
366 struct in6_addr *daddr;
367 int addr_type;
368 int rc;
369
370 if (addr_len < sizeof(*lsa))
371 return -EINVAL;
372
373 if (usin->sin6_family != AF_INET6)
374 return -EINVAL;
375
376 addr_type = ipv6_addr_type(&usin->sin6_addr);
377 if (addr_type & IPV6_ADDR_MULTICAST)
378 return -EINVAL;
379
380 if (addr_type & IPV6_ADDR_MAPPED) {
381 daddr = &usin->sin6_addr;
382 if (ipv4_is_multicast(daddr->s6_addr32[3]))
383 return -EINVAL;
384 }
385
386 lock_sock(sk);
387
388
389 if (sock_flag(sk, SOCK_ZAPPED)) {
390 rc = -EINVAL;
391 goto out_sk;
392 }
393
394 rc = __ip6_datagram_connect(sk, uaddr, addr_len);
395 if (rc < 0)
396 goto out_sk;
397
398 l2tp_ip6_sk(sk)->peer_conn_id = lsa->l2tp_conn_id;
399
400 write_lock_bh(&l2tp_ip6_lock);
401 hlist_del_init(&sk->sk_bind_node);
402 sk_add_bind_node(sk, &l2tp_ip6_bind_table);
403 write_unlock_bh(&l2tp_ip6_lock);
404
405out_sk:
406 release_sock(sk);
407
408 return rc;
409}
410
411static int l2tp_ip6_disconnect(struct sock *sk, int flags)
412{
413 if (sock_flag(sk, SOCK_ZAPPED))
414 return 0;
415
416 return __udp_disconnect(sk, flags);
417}
418
419static int l2tp_ip6_getname(struct socket *sock, struct sockaddr *uaddr,
420 int peer)
421{
422 struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *)uaddr;
423 struct sock *sk = sock->sk;
424 struct ipv6_pinfo *np = inet6_sk(sk);
425 struct l2tp_ip6_sock *lsk = l2tp_ip6_sk(sk);
426
427 lsa->l2tp_family = AF_INET6;
428 lsa->l2tp_flowinfo = 0;
429 lsa->l2tp_scope_id = 0;
430 lsa->l2tp_unused = 0;
431 if (peer) {
432 if (!lsk->peer_conn_id)
433 return -ENOTCONN;
434 lsa->l2tp_conn_id = lsk->peer_conn_id;
435 lsa->l2tp_addr = sk->sk_v6_daddr;
436 if (np->sndflow)
437 lsa->l2tp_flowinfo = np->flow_label;
438 } else {
439 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
440 lsa->l2tp_addr = np->saddr;
441 else
442 lsa->l2tp_addr = sk->sk_v6_rcv_saddr;
443
444 lsa->l2tp_conn_id = lsk->conn_id;
445 }
446 if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL)
447 lsa->l2tp_scope_id = sk->sk_bound_dev_if;
448 return sizeof(*lsa);
449}
450
451static int l2tp_ip6_backlog_recv(struct sock *sk, struct sk_buff *skb)
452{
453 int rc;
454
455
456 rc = sock_queue_rcv_skb(sk, skb);
457 if (rc < 0)
458 goto drop;
459
460 return 0;
461
462drop:
463 IP_INC_STATS(sock_net(sk), IPSTATS_MIB_INDISCARDS);
464 kfree_skb(skb);
465 return -1;
466}
467
468static int l2tp_ip6_push_pending_frames(struct sock *sk)
469{
470 struct sk_buff *skb;
471 __be32 *transhdr = NULL;
472 int err = 0;
473
474 skb = skb_peek(&sk->sk_write_queue);
475 if (skb == NULL)
476 goto out;
477
478 transhdr = (__be32 *)skb_transport_header(skb);
479 *transhdr = 0;
480
481 err = ip6_push_pending_frames(sk);
482
483out:
484 return err;
485}
486
487
488
489
490static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
491{
492 struct ipv6_txoptions opt_space;
493 DECLARE_SOCKADDR(struct sockaddr_l2tpip6 *, lsa, msg->msg_name);
494 struct in6_addr *daddr, *final_p, final;
495 struct ipv6_pinfo *np = inet6_sk(sk);
496 struct ipv6_txoptions *opt_to_free = NULL;
497 struct ipv6_txoptions *opt = NULL;
498 struct ip6_flowlabel *flowlabel = NULL;
499 struct dst_entry *dst = NULL;
500 struct flowi6 fl6;
501 struct ipcm6_cookie ipc6;
502 int addr_len = msg->msg_namelen;
503 int transhdrlen = 4;
504 int ulen = len + transhdrlen;
505 int err;
506
507
508
509
510 if (len > INT_MAX)
511 return -EMSGSIZE;
512
513
514 if (msg->msg_flags & MSG_OOB)
515 return -EOPNOTSUPP;
516
517
518
519
520 memset(&fl6, 0, sizeof(fl6));
521
522 fl6.flowi6_mark = sk->sk_mark;
523 fl6.flowi6_uid = sk->sk_uid;
524
525 ipcm6_init(&ipc6);
526
527 if (lsa) {
528 if (addr_len < SIN6_LEN_RFC2133)
529 return -EINVAL;
530
531 if (lsa->l2tp_family && lsa->l2tp_family != AF_INET6)
532 return -EAFNOSUPPORT;
533
534 daddr = &lsa->l2tp_addr;
535 if (np->sndflow) {
536 fl6.flowlabel = lsa->l2tp_flowinfo & IPV6_FLOWINFO_MASK;
537 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
538 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
539 if (IS_ERR(flowlabel))
540 return -EINVAL;
541 }
542 }
543
544
545
546
547
548 if (sk->sk_state == TCP_ESTABLISHED &&
549 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
550 daddr = &sk->sk_v6_daddr;
551
552 if (addr_len >= sizeof(struct sockaddr_in6) &&
553 lsa->l2tp_scope_id &&
554 ipv6_addr_type(daddr) & IPV6_ADDR_LINKLOCAL)
555 fl6.flowi6_oif = lsa->l2tp_scope_id;
556 } else {
557 if (sk->sk_state != TCP_ESTABLISHED)
558 return -EDESTADDRREQ;
559
560 daddr = &sk->sk_v6_daddr;
561 fl6.flowlabel = np->flow_label;
562 }
563
564 if (fl6.flowi6_oif == 0)
565 fl6.flowi6_oif = sk->sk_bound_dev_if;
566
567 if (msg->msg_controllen) {
568 opt = &opt_space;
569 memset(opt, 0, sizeof(struct ipv6_txoptions));
570 opt->tot_len = sizeof(struct ipv6_txoptions);
571 ipc6.opt = opt;
572
573 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
574 if (err < 0) {
575 fl6_sock_release(flowlabel);
576 return err;
577 }
578 if ((fl6.flowlabel & IPV6_FLOWLABEL_MASK) && !flowlabel) {
579 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
580 if (IS_ERR(flowlabel))
581 return -EINVAL;
582 }
583 if (!(opt->opt_nflen|opt->opt_flen))
584 opt = NULL;
585 }
586
587 if (!opt) {
588 opt = txopt_get(np);
589 opt_to_free = opt;
590 }
591 if (flowlabel)
592 opt = fl6_merge_options(&opt_space, flowlabel, opt);
593 opt = ipv6_fixup_options(&opt_space, opt);
594 ipc6.opt = opt;
595
596 fl6.flowi6_proto = sk->sk_protocol;
597 if (!ipv6_addr_any(daddr))
598 fl6.daddr = *daddr;
599 else
600 fl6.daddr.s6_addr[15] = 0x1;
601 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
602 fl6.saddr = np->saddr;
603
604 final_p = fl6_update_dst(&fl6, opt, &final);
605
606 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
607 fl6.flowi6_oif = np->mcast_oif;
608 else if (!fl6.flowi6_oif)
609 fl6.flowi6_oif = np->ucast_oif;
610
611 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
612
613 if (ipc6.tclass < 0)
614 ipc6.tclass = np->tclass;
615
616 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
617
618 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
619 if (IS_ERR(dst)) {
620 err = PTR_ERR(dst);
621 goto out;
622 }
623
624 if (ipc6.hlimit < 0)
625 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
626
627 if (ipc6.dontfrag < 0)
628 ipc6.dontfrag = np->dontfrag;
629
630 if (msg->msg_flags & MSG_CONFIRM)
631 goto do_confirm;
632
633back_from_confirm:
634 lock_sock(sk);
635 err = ip6_append_data(sk, ip_generic_getfrag, msg,
636 ulen, transhdrlen, &ipc6,
637 &fl6, (struct rt6_info *)dst,
638 msg->msg_flags);
639 if (err)
640 ip6_flush_pending_frames(sk);
641 else if (!(msg->msg_flags & MSG_MORE))
642 err = l2tp_ip6_push_pending_frames(sk);
643 release_sock(sk);
644done:
645 dst_release(dst);
646out:
647 fl6_sock_release(flowlabel);
648 txopt_put(opt_to_free);
649
650 return err < 0 ? err : len;
651
652do_confirm:
653 if (msg->msg_flags & MSG_PROBE)
654 dst_confirm_neigh(dst, &fl6.daddr);
655 if (!(msg->msg_flags & MSG_PROBE) || len)
656 goto back_from_confirm;
657 err = 0;
658 goto done;
659}
660
661static int l2tp_ip6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
662 int noblock, int flags, int *addr_len)
663{
664 struct ipv6_pinfo *np = inet6_sk(sk);
665 DECLARE_SOCKADDR(struct sockaddr_l2tpip6 *, lsa, msg->msg_name);
666 size_t copied = 0;
667 int err = -EOPNOTSUPP;
668 struct sk_buff *skb;
669
670 if (flags & MSG_OOB)
671 goto out;
672
673 if (flags & MSG_ERRQUEUE)
674 return ipv6_recv_error(sk, msg, len, addr_len);
675
676 skb = skb_recv_datagram(sk, flags, noblock, &err);
677 if (!skb)
678 goto out;
679
680 copied = skb->len;
681 if (len < copied) {
682 msg->msg_flags |= MSG_TRUNC;
683 copied = len;
684 }
685
686 err = skb_copy_datagram_msg(skb, 0, msg, copied);
687 if (err)
688 goto done;
689
690 sock_recv_timestamp(msg, sk, skb);
691
692
693 if (lsa) {
694 lsa->l2tp_family = AF_INET6;
695 lsa->l2tp_unused = 0;
696 lsa->l2tp_addr = ipv6_hdr(skb)->saddr;
697 lsa->l2tp_flowinfo = 0;
698 lsa->l2tp_scope_id = 0;
699 lsa->l2tp_conn_id = 0;
700 if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL)
701 lsa->l2tp_scope_id = inet6_iif(skb);
702 *addr_len = sizeof(*lsa);
703 }
704
705 if (np->rxopt.all)
706 ip6_datagram_recv_ctl(sk, msg, skb);
707
708 if (flags & MSG_TRUNC)
709 copied = skb->len;
710done:
711 skb_free_datagram(sk, skb);
712out:
713 return err ? err : copied;
714}
715
716static struct proto l2tp_ip6_prot = {
717 .name = "L2TP/IPv6",
718 .owner = THIS_MODULE,
719 .init = l2tp_ip6_open,
720 .close = l2tp_ip6_close,
721 .bind = l2tp_ip6_bind,
722 .connect = l2tp_ip6_connect,
723 .disconnect = l2tp_ip6_disconnect,
724 .ioctl = l2tp_ioctl,
725 .destroy = l2tp_ip6_destroy_sock,
726 .setsockopt = ipv6_setsockopt,
727 .getsockopt = ipv6_getsockopt,
728 .sendmsg = l2tp_ip6_sendmsg,
729 .recvmsg = l2tp_ip6_recvmsg,
730 .backlog_rcv = l2tp_ip6_backlog_recv,
731 .hash = inet6_hash,
732 .unhash = inet_unhash,
733 .obj_size = sizeof(struct l2tp_ip6_sock),
734#ifdef CONFIG_COMPAT
735 .compat_setsockopt = compat_ipv6_setsockopt,
736 .compat_getsockopt = compat_ipv6_getsockopt,
737#endif
738};
739
740static const struct proto_ops l2tp_ip6_ops = {
741 .family = PF_INET6,
742 .owner = THIS_MODULE,
743 .release = inet6_release,
744 .bind = inet6_bind,
745 .connect = inet_dgram_connect,
746 .socketpair = sock_no_socketpair,
747 .accept = sock_no_accept,
748 .getname = l2tp_ip6_getname,
749 .poll = datagram_poll,
750 .ioctl = inet6_ioctl,
751 .gettstamp = sock_gettstamp,
752 .listen = sock_no_listen,
753 .shutdown = inet_shutdown,
754 .setsockopt = sock_common_setsockopt,
755 .getsockopt = sock_common_getsockopt,
756 .sendmsg = inet_sendmsg,
757 .recvmsg = sock_common_recvmsg,
758 .mmap = sock_no_mmap,
759 .sendpage = sock_no_sendpage,
760#ifdef CONFIG_COMPAT
761 .compat_setsockopt = compat_sock_common_setsockopt,
762 .compat_getsockopt = compat_sock_common_getsockopt,
763#endif
764};
765
766static struct inet_protosw l2tp_ip6_protosw = {
767 .type = SOCK_DGRAM,
768 .protocol = IPPROTO_L2TP,
769 .prot = &l2tp_ip6_prot,
770 .ops = &l2tp_ip6_ops,
771};
772
773static struct inet6_protocol l2tp_ip6_protocol __read_mostly = {
774 .handler = l2tp_ip6_recv,
775};
776
777static int __init l2tp_ip6_init(void)
778{
779 int err;
780
781 pr_info("L2TP IP encapsulation support for IPv6 (L2TPv3)\n");
782
783 err = proto_register(&l2tp_ip6_prot, 1);
784 if (err != 0)
785 goto out;
786
787 err = inet6_add_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP);
788 if (err)
789 goto out1;
790
791 inet6_register_protosw(&l2tp_ip6_protosw);
792 return 0;
793
794out1:
795 proto_unregister(&l2tp_ip6_prot);
796out:
797 return err;
798}
799
800static void __exit l2tp_ip6_exit(void)
801{
802 inet6_unregister_protosw(&l2tp_ip6_protosw);
803 inet6_del_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP);
804 proto_unregister(&l2tp_ip6_prot);
805}
806
807module_init(l2tp_ip6_init);
808module_exit(l2tp_ip6_exit);
809
810MODULE_LICENSE("GPL");
811MODULE_AUTHOR("Chris Elston <celston@katalix.com>");
812MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6");
813MODULE_VERSION("1.0");
814
815
816
817
818MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 2, IPPROTO_L2TP);
819MODULE_ALIAS_NET_PF_PROTO(PF_INET6, IPPROTO_L2TP);
820
