This source file includes following definitions.
- l2tp_ip6_sk
- __l2tp_ip6_bind_lookup
- l2tp_ip6_recv
- l2tp_ip6_hash
- l2tp_ip6_unhash
- l2tp_ip6_open
- l2tp_ip6_close
- l2tp_ip6_destroy_sock
- l2tp_ip6_bind
- l2tp_ip6_connect
- l2tp_ip6_disconnect
- l2tp_ip6_getname
- l2tp_ip6_backlog_recv
- l2tp_ip6_push_pending_frames
- l2tp_ip6_sendmsg
- l2tp_ip6_recvmsg
- l2tp_ip6_init
- l2tp_ip6_exit
1
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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/tcp_states.h>
24 #include <net/protocol.h>
25 #include <net/xfrm.h>
26
27 #include <net/transp_v6.h>
28 #include <net/addrconf.h>
29 #include <net/ip6_route.h>
30
31 #include "l2tp_core.h"
32
33 struct l2tp_ip6_sock {
34
35 struct inet_sock inet;
36
37 u32 conn_id;
38 u32 peer_conn_id;
39
40
41
42 struct ipv6_pinfo inet6;
43 };
44
45 static DEFINE_RWLOCK(l2tp_ip6_lock);
46 static struct hlist_head l2tp_ip6_table;
47 static struct hlist_head l2tp_ip6_bind_table;
48
49 static inline struct l2tp_ip6_sock *l2tp_ip6_sk(const struct sock *sk)
50 {
51 return (struct l2tp_ip6_sock *)sk;
52 }
53
54 static struct sock *__l2tp_ip6_bind_lookup(const struct net *net,
55 const struct in6_addr *laddr,
56 const struct in6_addr *raddr,
57 int dif, u32 tunnel_id)
58 {
59 struct sock *sk;
60
61 sk_for_each_bound(sk, &l2tp_ip6_bind_table) {
62 const struct in6_addr *sk_laddr = inet6_rcv_saddr(sk);
63 const struct in6_addr *sk_raddr = &sk->sk_v6_daddr;
64 const struct l2tp_ip6_sock *l2tp = l2tp_ip6_sk(sk);
65
66 if (!net_eq(sock_net(sk), net))
67 continue;
68
69 if (sk->sk_bound_dev_if && dif && sk->sk_bound_dev_if != dif)
70 continue;
71
72 if (sk_laddr && !ipv6_addr_any(sk_laddr) &&
73 !ipv6_addr_any(laddr) && !ipv6_addr_equal(sk_laddr, laddr))
74 continue;
75
76 if (!ipv6_addr_any(sk_raddr) && raddr &&
77 !ipv6_addr_any(raddr) && !ipv6_addr_equal(sk_raddr, raddr))
78 continue;
79
80 if (l2tp->conn_id != tunnel_id)
81 continue;
82
83 goto found;
84 }
85
86 sk = NULL;
87 found:
88 return sk;
89 }
90
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121
122
123
124 static int l2tp_ip6_recv(struct sk_buff *skb)
125 {
126 struct net *net = dev_net(skb->dev);
127 struct sock *sk;
128 u32 session_id;
129 u32 tunnel_id;
130 unsigned char *ptr, *optr;
131 struct l2tp_session *session;
132 struct l2tp_tunnel *tunnel = NULL;
133 struct ipv6hdr *iph;
134 int length;
135
136 if (!pskb_may_pull(skb, 4))
137 goto discard;
138
139
140 optr = ptr = skb->data;
141 session_id = ntohl(*((__be32 *) ptr));
142 ptr += 4;
143
144
145
146
147
148 if (session_id == 0) {
149 __skb_pull(skb, 4);
150 goto pass_up;
151 }
152
153
154 session = l2tp_session_get(net, session_id);
155 if (!session)
156 goto discard;
157
158 tunnel = session->tunnel;
159 if (!tunnel)
160 goto discard_sess;
161
162
163 if (tunnel->debug & L2TP_MSG_DATA) {
164 length = min(32u, skb->len);
165 if (!pskb_may_pull(skb, length))
166 goto discard_sess;
167
168
169 optr = ptr = skb->data;
170 ptr += 4;
171 pr_debug("%s: ip recv\n", tunnel->name);
172 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
173 }
174
175 if (l2tp_v3_ensure_opt_in_linear(session, skb, &ptr, &optr))
176 goto discard_sess;
177
178 l2tp_recv_common(session, skb, ptr, optr, 0, skb->len);
179 l2tp_session_dec_refcount(session);
180
181 return 0;
182
183 pass_up:
184
185 if (!pskb_may_pull(skb, 12))
186 goto discard;
187
188 if ((skb->data[0] & 0xc0) != 0xc0)
189 goto discard;
190
191 tunnel_id = ntohl(*(__be32 *) &skb->data[4]);
192 iph = ipv6_hdr(skb);
193
194 read_lock_bh(&l2tp_ip6_lock);
195 sk = __l2tp_ip6_bind_lookup(net, &iph->daddr, &iph->saddr,
196 inet6_iif(skb), tunnel_id);
197 if (!sk) {
198 read_unlock_bh(&l2tp_ip6_lock);
199 goto discard;
200 }
201 sock_hold(sk);
202 read_unlock_bh(&l2tp_ip6_lock);
203
204 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
205 goto discard_put;
206
207 nf_reset_ct(skb);
208
209 return sk_receive_skb(sk, skb, 1);
210
211 discard_sess:
212 l2tp_session_dec_refcount(session);
213 goto discard;
214
215 discard_put:
216 sock_put(sk);
217
218 discard:
219 kfree_skb(skb);
220 return 0;
221 }
222
223 static int l2tp_ip6_hash(struct sock *sk)
224 {
225 if (sk_unhashed(sk)) {
226 write_lock_bh(&l2tp_ip6_lock);
227 sk_add_node(sk, &l2tp_ip6_table);
228 write_unlock_bh(&l2tp_ip6_lock);
229 }
230 return 0;
231 }
232
233 static void l2tp_ip6_unhash(struct sock *sk)
234 {
235 if (sk_unhashed(sk))
236 return;
237 write_lock_bh(&l2tp_ip6_lock);
238 sk_del_node_init(sk);
239 write_unlock_bh(&l2tp_ip6_lock);
240 }
241
242 static int l2tp_ip6_open(struct sock *sk)
243 {
244
245 inet_sk(sk)->inet_num = IPPROTO_L2TP;
246
247 l2tp_ip6_hash(sk);
248 return 0;
249 }
250
251 static void l2tp_ip6_close(struct sock *sk, long timeout)
252 {
253 write_lock_bh(&l2tp_ip6_lock);
254 hlist_del_init(&sk->sk_bind_node);
255 sk_del_node_init(sk);
256 write_unlock_bh(&l2tp_ip6_lock);
257
258 sk_common_release(sk);
259 }
260
261 static void l2tp_ip6_destroy_sock(struct sock *sk)
262 {
263 struct l2tp_tunnel *tunnel = sk->sk_user_data;
264
265 lock_sock(sk);
266 ip6_flush_pending_frames(sk);
267 release_sock(sk);
268
269 if (tunnel)
270 l2tp_tunnel_delete(tunnel);
271
272 inet6_destroy_sock(sk);
273 }
274
275 static int l2tp_ip6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
276 {
277 struct inet_sock *inet = inet_sk(sk);
278 struct ipv6_pinfo *np = inet6_sk(sk);
279 struct sockaddr_l2tpip6 *addr = (struct sockaddr_l2tpip6 *) uaddr;
280 struct net *net = sock_net(sk);
281 __be32 v4addr = 0;
282 int bound_dev_if;
283 int addr_type;
284 int err;
285
286 if (addr->l2tp_family != AF_INET6)
287 return -EINVAL;
288 if (addr_len < sizeof(*addr))
289 return -EINVAL;
290
291 addr_type = ipv6_addr_type(&addr->l2tp_addr);
292
293
294 if (addr_type == IPV6_ADDR_MAPPED)
295 return -EADDRNOTAVAIL;
296
297
298 if (addr_type & IPV6_ADDR_MULTICAST)
299 return -EADDRNOTAVAIL;
300
301 lock_sock(sk);
302
303 err = -EINVAL;
304 if (!sock_flag(sk, SOCK_ZAPPED))
305 goto out_unlock;
306
307 if (sk->sk_state != TCP_CLOSE)
308 goto out_unlock;
309
310 bound_dev_if = sk->sk_bound_dev_if;
311
312
313 rcu_read_lock();
314 if (addr_type != IPV6_ADDR_ANY) {
315 struct net_device *dev = NULL;
316
317 if (addr_type & IPV6_ADDR_LINKLOCAL) {
318 if (addr->l2tp_scope_id)
319 bound_dev_if = addr->l2tp_scope_id;
320
321
322
323
324 if (!bound_dev_if)
325 goto out_unlock_rcu;
326
327 err = -ENODEV;
328 dev = dev_get_by_index_rcu(sock_net(sk), bound_dev_if);
329 if (!dev)
330 goto out_unlock_rcu;
331 }
332
333
334
335
336 v4addr = LOOPBACK4_IPV6;
337 err = -EADDRNOTAVAIL;
338 if (!ipv6_chk_addr(sock_net(sk), &addr->l2tp_addr, dev, 0))
339 goto out_unlock_rcu;
340 }
341 rcu_read_unlock();
342
343 write_lock_bh(&l2tp_ip6_lock);
344 if (__l2tp_ip6_bind_lookup(net, &addr->l2tp_addr, NULL, bound_dev_if,
345 addr->l2tp_conn_id)) {
346 write_unlock_bh(&l2tp_ip6_lock);
347 err = -EADDRINUSE;
348 goto out_unlock;
349 }
350
351 inet->inet_saddr = v4addr;
352 inet->inet_rcv_saddr = v4addr;
353 sk->sk_bound_dev_if = bound_dev_if;
354 sk->sk_v6_rcv_saddr = addr->l2tp_addr;
355 np->saddr = addr->l2tp_addr;
356
357 l2tp_ip6_sk(sk)->conn_id = addr->l2tp_conn_id;
358
359 sk_add_bind_node(sk, &l2tp_ip6_bind_table);
360 sk_del_node_init(sk);
361 write_unlock_bh(&l2tp_ip6_lock);
362
363 sock_reset_flag(sk, SOCK_ZAPPED);
364 release_sock(sk);
365 return 0;
366
367 out_unlock_rcu:
368 rcu_read_unlock();
369 out_unlock:
370 release_sock(sk);
371
372 return err;
373 }
374
375 static int l2tp_ip6_connect(struct sock *sk, struct sockaddr *uaddr,
376 int addr_len)
377 {
378 struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *) uaddr;
379 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
380 struct in6_addr *daddr;
381 int addr_type;
382 int rc;
383
384 if (addr_len < sizeof(*lsa))
385 return -EINVAL;
386
387 if (usin->sin6_family != AF_INET6)
388 return -EINVAL;
389
390 addr_type = ipv6_addr_type(&usin->sin6_addr);
391 if (addr_type & IPV6_ADDR_MULTICAST)
392 return -EINVAL;
393
394 if (addr_type & IPV6_ADDR_MAPPED) {
395 daddr = &usin->sin6_addr;
396 if (ipv4_is_multicast(daddr->s6_addr32[3]))
397 return -EINVAL;
398 }
399
400 lock_sock(sk);
401
402
403 if (sock_flag(sk, SOCK_ZAPPED)) {
404 rc = -EINVAL;
405 goto out_sk;
406 }
407
408 rc = __ip6_datagram_connect(sk, uaddr, addr_len);
409 if (rc < 0)
410 goto out_sk;
411
412 l2tp_ip6_sk(sk)->peer_conn_id = lsa->l2tp_conn_id;
413
414 write_lock_bh(&l2tp_ip6_lock);
415 hlist_del_init(&sk->sk_bind_node);
416 sk_add_bind_node(sk, &l2tp_ip6_bind_table);
417 write_unlock_bh(&l2tp_ip6_lock);
418
419 out_sk:
420 release_sock(sk);
421
422 return rc;
423 }
424
425 static int l2tp_ip6_disconnect(struct sock *sk, int flags)
426 {
427 if (sock_flag(sk, SOCK_ZAPPED))
428 return 0;
429
430 return __udp_disconnect(sk, flags);
431 }
432
433 static int l2tp_ip6_getname(struct socket *sock, struct sockaddr *uaddr,
434 int peer)
435 {
436 struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *)uaddr;
437 struct sock *sk = sock->sk;
438 struct ipv6_pinfo *np = inet6_sk(sk);
439 struct l2tp_ip6_sock *lsk = l2tp_ip6_sk(sk);
440
441 lsa->l2tp_family = AF_INET6;
442 lsa->l2tp_flowinfo = 0;
443 lsa->l2tp_scope_id = 0;
444 lsa->l2tp_unused = 0;
445 if (peer) {
446 if (!lsk->peer_conn_id)
447 return -ENOTCONN;
448 lsa->l2tp_conn_id = lsk->peer_conn_id;
449 lsa->l2tp_addr = sk->sk_v6_daddr;
450 if (np->sndflow)
451 lsa->l2tp_flowinfo = np->flow_label;
452 } else {
453 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
454 lsa->l2tp_addr = np->saddr;
455 else
456 lsa->l2tp_addr = sk->sk_v6_rcv_saddr;
457
458 lsa->l2tp_conn_id = lsk->conn_id;
459 }
460 if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL)
461 lsa->l2tp_scope_id = sk->sk_bound_dev_if;
462 return sizeof(*lsa);
463 }
464
465 static int l2tp_ip6_backlog_recv(struct sock *sk, struct sk_buff *skb)
466 {
467 int rc;
468
469
470 rc = sock_queue_rcv_skb(sk, skb);
471 if (rc < 0)
472 goto drop;
473
474 return 0;
475
476 drop:
477 IP_INC_STATS(sock_net(sk), IPSTATS_MIB_INDISCARDS);
478 kfree_skb(skb);
479 return -1;
480 }
481
482 static int l2tp_ip6_push_pending_frames(struct sock *sk)
483 {
484 struct sk_buff *skb;
485 __be32 *transhdr = NULL;
486 int err = 0;
487
488 skb = skb_peek(&sk->sk_write_queue);
489 if (skb == NULL)
490 goto out;
491
492 transhdr = (__be32 *)skb_transport_header(skb);
493 *transhdr = 0;
494
495 err = ip6_push_pending_frames(sk);
496
497 out:
498 return err;
499 }
500
501
502
503
504 static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
505 {
506 struct ipv6_txoptions opt_space;
507 DECLARE_SOCKADDR(struct sockaddr_l2tpip6 *, lsa, msg->msg_name);
508 struct in6_addr *daddr, *final_p, final;
509 struct ipv6_pinfo *np = inet6_sk(sk);
510 struct ipv6_txoptions *opt_to_free = NULL;
511 struct ipv6_txoptions *opt = NULL;
512 struct ip6_flowlabel *flowlabel = NULL;
513 struct dst_entry *dst = NULL;
514 struct flowi6 fl6;
515 struct ipcm6_cookie ipc6;
516 int addr_len = msg->msg_namelen;
517 int transhdrlen = 4;
518 int ulen = len + transhdrlen;
519 int err;
520
521
522
523
524 if (len > INT_MAX)
525 return -EMSGSIZE;
526
527
528 if (msg->msg_flags & MSG_OOB)
529 return -EOPNOTSUPP;
530
531
532
533
534 memset(&fl6, 0, sizeof(fl6));
535
536 fl6.flowi6_mark = sk->sk_mark;
537 fl6.flowi6_uid = sk->sk_uid;
538
539 ipcm6_init(&ipc6);
540
541 if (lsa) {
542 if (addr_len < SIN6_LEN_RFC2133)
543 return -EINVAL;
544
545 if (lsa->l2tp_family && lsa->l2tp_family != AF_INET6)
546 return -EAFNOSUPPORT;
547
548 daddr = &lsa->l2tp_addr;
549 if (np->sndflow) {
550 fl6.flowlabel = lsa->l2tp_flowinfo & IPV6_FLOWINFO_MASK;
551 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
552 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
553 if (IS_ERR(flowlabel))
554 return -EINVAL;
555 }
556 }
557
558
559
560
561
562 if (sk->sk_state == TCP_ESTABLISHED &&
563 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
564 daddr = &sk->sk_v6_daddr;
565
566 if (addr_len >= sizeof(struct sockaddr_in6) &&
567 lsa->l2tp_scope_id &&
568 ipv6_addr_type(daddr) & IPV6_ADDR_LINKLOCAL)
569 fl6.flowi6_oif = lsa->l2tp_scope_id;
570 } else {
571 if (sk->sk_state != TCP_ESTABLISHED)
572 return -EDESTADDRREQ;
573
574 daddr = &sk->sk_v6_daddr;
575 fl6.flowlabel = np->flow_label;
576 }
577
578 if (fl6.flowi6_oif == 0)
579 fl6.flowi6_oif = sk->sk_bound_dev_if;
580
581 if (msg->msg_controllen) {
582 opt = &opt_space;
583 memset(opt, 0, sizeof(struct ipv6_txoptions));
584 opt->tot_len = sizeof(struct ipv6_txoptions);
585 ipc6.opt = opt;
586
587 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
588 if (err < 0) {
589 fl6_sock_release(flowlabel);
590 return err;
591 }
592 if ((fl6.flowlabel & IPV6_FLOWLABEL_MASK) && !flowlabel) {
593 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
594 if (IS_ERR(flowlabel))
595 return -EINVAL;
596 }
597 if (!(opt->opt_nflen|opt->opt_flen))
598 opt = NULL;
599 }
600
601 if (!opt) {
602 opt = txopt_get(np);
603 opt_to_free = opt;
604 }
605 if (flowlabel)
606 opt = fl6_merge_options(&opt_space, flowlabel, opt);
607 opt = ipv6_fixup_options(&opt_space, opt);
608 ipc6.opt = opt;
609
610 fl6.flowi6_proto = sk->sk_protocol;
611 if (!ipv6_addr_any(daddr))
612 fl6.daddr = *daddr;
613 else
614 fl6.daddr.s6_addr[15] = 0x1;
615 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
616 fl6.saddr = np->saddr;
617
618 final_p = fl6_update_dst(&fl6, opt, &final);
619
620 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
621 fl6.flowi6_oif = np->mcast_oif;
622 else if (!fl6.flowi6_oif)
623 fl6.flowi6_oif = np->ucast_oif;
624
625 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
626
627 if (ipc6.tclass < 0)
628 ipc6.tclass = np->tclass;
629
630 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
631
632 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
633 if (IS_ERR(dst)) {
634 err = PTR_ERR(dst);
635 goto out;
636 }
637
638 if (ipc6.hlimit < 0)
639 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
640
641 if (ipc6.dontfrag < 0)
642 ipc6.dontfrag = np->dontfrag;
643
644 if (msg->msg_flags & MSG_CONFIRM)
645 goto do_confirm;
646
647 back_from_confirm:
648 lock_sock(sk);
649 err = ip6_append_data(sk, ip_generic_getfrag, msg,
650 ulen, transhdrlen, &ipc6,
651 &fl6, (struct rt6_info *)dst,
652 msg->msg_flags);
653 if (err)
654 ip6_flush_pending_frames(sk);
655 else if (!(msg->msg_flags & MSG_MORE))
656 err = l2tp_ip6_push_pending_frames(sk);
657 release_sock(sk);
658 done:
659 dst_release(dst);
660 out:
661 fl6_sock_release(flowlabel);
662 txopt_put(opt_to_free);
663
664 return err < 0 ? err : len;
665
666 do_confirm:
667 if (msg->msg_flags & MSG_PROBE)
668 dst_confirm_neigh(dst, &fl6.daddr);
669 if (!(msg->msg_flags & MSG_PROBE) || len)
670 goto back_from_confirm;
671 err = 0;
672 goto done;
673 }
674
675 static int l2tp_ip6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
676 int noblock, int flags, int *addr_len)
677 {
678 struct ipv6_pinfo *np = inet6_sk(sk);
679 DECLARE_SOCKADDR(struct sockaddr_l2tpip6 *, lsa, msg->msg_name);
680 size_t copied = 0;
681 int err = -EOPNOTSUPP;
682 struct sk_buff *skb;
683
684 if (flags & MSG_OOB)
685 goto out;
686
687 if (flags & MSG_ERRQUEUE)
688 return ipv6_recv_error(sk, msg, len, addr_len);
689
690 skb = skb_recv_datagram(sk, flags, noblock, &err);
691 if (!skb)
692 goto out;
693
694 copied = skb->len;
695 if (len < copied) {
696 msg->msg_flags |= MSG_TRUNC;
697 copied = len;
698 }
699
700 err = skb_copy_datagram_msg(skb, 0, msg, copied);
701 if (err)
702 goto done;
703
704 sock_recv_timestamp(msg, sk, skb);
705
706
707 if (lsa) {
708 lsa->l2tp_family = AF_INET6;
709 lsa->l2tp_unused = 0;
710 lsa->l2tp_addr = ipv6_hdr(skb)->saddr;
711 lsa->l2tp_flowinfo = 0;
712 lsa->l2tp_scope_id = 0;
713 lsa->l2tp_conn_id = 0;
714 if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL)
715 lsa->l2tp_scope_id = inet6_iif(skb);
716 *addr_len = sizeof(*lsa);
717 }
718
719 if (np->rxopt.all)
720 ip6_datagram_recv_ctl(sk, msg, skb);
721
722 if (flags & MSG_TRUNC)
723 copied = skb->len;
724 done:
725 skb_free_datagram(sk, skb);
726 out:
727 return err ? err : copied;
728 }
729
730 static struct proto l2tp_ip6_prot = {
731 .name = "L2TP/IPv6",
732 .owner = THIS_MODULE,
733 .init = l2tp_ip6_open,
734 .close = l2tp_ip6_close,
735 .bind = l2tp_ip6_bind,
736 .connect = l2tp_ip6_connect,
737 .disconnect = l2tp_ip6_disconnect,
738 .ioctl = l2tp_ioctl,
739 .destroy = l2tp_ip6_destroy_sock,
740 .setsockopt = ipv6_setsockopt,
741 .getsockopt = ipv6_getsockopt,
742 .sendmsg = l2tp_ip6_sendmsg,
743 .recvmsg = l2tp_ip6_recvmsg,
744 .backlog_rcv = l2tp_ip6_backlog_recv,
745 .hash = l2tp_ip6_hash,
746 .unhash = l2tp_ip6_unhash,
747 .obj_size = sizeof(struct l2tp_ip6_sock),
748 #ifdef CONFIG_COMPAT
749 .compat_setsockopt = compat_ipv6_setsockopt,
750 .compat_getsockopt = compat_ipv6_getsockopt,
751 #endif
752 };
753
754 static const struct proto_ops l2tp_ip6_ops = {
755 .family = PF_INET6,
756 .owner = THIS_MODULE,
757 .release = inet6_release,
758 .bind = inet6_bind,
759 .connect = inet_dgram_connect,
760 .socketpair = sock_no_socketpair,
761 .accept = sock_no_accept,
762 .getname = l2tp_ip6_getname,
763 .poll = datagram_poll,
764 .ioctl = inet6_ioctl,
765 .gettstamp = sock_gettstamp,
766 .listen = sock_no_listen,
767 .shutdown = inet_shutdown,
768 .setsockopt = sock_common_setsockopt,
769 .getsockopt = sock_common_getsockopt,
770 .sendmsg = inet_sendmsg,
771 .recvmsg = sock_common_recvmsg,
772 .mmap = sock_no_mmap,
773 .sendpage = sock_no_sendpage,
774 #ifdef CONFIG_COMPAT
775 .compat_setsockopt = compat_sock_common_setsockopt,
776 .compat_getsockopt = compat_sock_common_getsockopt,
777 #endif
778 };
779
780 static struct inet_protosw l2tp_ip6_protosw = {
781 .type = SOCK_DGRAM,
782 .protocol = IPPROTO_L2TP,
783 .prot = &l2tp_ip6_prot,
784 .ops = &l2tp_ip6_ops,
785 };
786
787 static struct inet6_protocol l2tp_ip6_protocol __read_mostly = {
788 .handler = l2tp_ip6_recv,
789 };
790
791 static int __init l2tp_ip6_init(void)
792 {
793 int err;
794
795 pr_info("L2TP IP encapsulation support for IPv6 (L2TPv3)\n");
796
797 err = proto_register(&l2tp_ip6_prot, 1);
798 if (err != 0)
799 goto out;
800
801 err = inet6_add_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP);
802 if (err)
803 goto out1;
804
805 inet6_register_protosw(&l2tp_ip6_protosw);
806 return 0;
807
808 out1:
809 proto_unregister(&l2tp_ip6_prot);
810 out:
811 return err;
812 }
813
814 static void __exit l2tp_ip6_exit(void)
815 {
816 inet6_unregister_protosw(&l2tp_ip6_protosw);
817 inet6_del_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP);
818 proto_unregister(&l2tp_ip6_prot);
819 }
820
821 module_init(l2tp_ip6_init);
822 module_exit(l2tp_ip6_exit);
823
824 MODULE_LICENSE("GPL");
825 MODULE_AUTHOR("Chris Elston <celston@katalix.com>");
826 MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6");
827 MODULE_VERSION("1.0");
828
829
830
831
832 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 2, IPPROTO_L2TP);
833 MODULE_ALIAS_NET_PF_PROTO(PF_INET6, IPPROTO_L2TP);