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Merge tag 'firewire-update2' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee139...
[deliverable/linux.git] / net / l2tp / l2tp_ip6.c
CommitLineData
a32e0eec
CE		 1/*
2 * L2TPv3 IP encapsulation support for IPv6
3 *
4 * Copyright (c) 2012 Katalix Systems Ltd
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
a4ca44fa
JP		 12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
a32e0eec
CE		 14#include <linux/icmp.h>
15#include <linux/module.h>
16#include <linux/skbuff.h>
17#include <linux/random.h>
18#include <linux/socket.h>
19#include <linux/l2tp.h>
20#include <linux/in.h>
21#include <linux/in6.h>
22#include <net/sock.h>
23#include <net/ip.h>
24#include <net/icmp.h>
25#include <net/udp.h>
26#include <net/inet_common.h>
27#include <net/inet_hashtables.h>
496611d7 28#include <net/inet6_hashtables.h>
a32e0eec
CE		 29#include <net/tcp_states.h>
30#include <net/protocol.h>
31#include <net/xfrm.h>
32
33#include <net/transp_v6.h>
34#include <net/addrconf.h>
35#include <net/ip6_route.h>
36
37#include "l2tp_core.h"
38
39struct l2tp_ip6_sock {
40 /* inet_sock has to be the first member of l2tp_ip6_sock */
41 struct inet_sock inet;
42
43 u32 conn_id;
44 u32 peer_conn_id;
45
46 /* ipv6_pinfo has to be the last member of l2tp_ip6_sock, see
47 inet6_sk_generic */
48 struct ipv6_pinfo inet6;
49};
50
51static DEFINE_RWLOCK(l2tp_ip6_lock);
52static struct hlist_head l2tp_ip6_table;
53static struct hlist_head l2tp_ip6_bind_table;
54
55static inline struct l2tp_ip6_sock *l2tp_ip6_sk(const struct sock *sk)
56{
57 return (struct l2tp_ip6_sock *)sk;
58}
59
60static struct sock *__l2tp_ip6_bind_lookup(struct net *net,
61 struct in6_addr *laddr,
62 int dif, u32 tunnel_id)
63{
a32e0eec
CE		 64 struct sock *sk;
65
b67bfe0d 66 sk_for_each_bound(sk, &l2tp_ip6_bind_table) {
efe4208f 67 const struct in6_addr *addr = inet6_rcv_saddr(sk);
a32e0eec
CE		 68 struct l2tp_ip6_sock *l2tp = l2tp_ip6_sk(sk);
69
70 if (l2tp == NULL)
71 continue;
72
73 if ((l2tp->conn_id == tunnel_id) &&
74 net_eq(sock_net(sk), net) &&
75 !(addr && ipv6_addr_equal(addr, laddr)) &&
76 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
77 goto found;
78 }
79
80 sk = NULL;
81found:
82 return sk;
83}
84
85static inline struct sock *l2tp_ip6_bind_lookup(struct net *net,
86 struct in6_addr *laddr,
87 int dif, u32 tunnel_id)
88{
89 struct sock *sk = __l2tp_ip6_bind_lookup(net, laddr, dif, tunnel_id);
90 if (sk)
91 sock_hold(sk);
92
93 return sk;
94}
95
96/* When processing receive frames, there are two cases to
97 * consider. Data frames consist of a non-zero session-id and an
98 * optional cookie. Control frames consist of a regular L2TP header
99 * preceded by 32-bits of zeros.
100 *
101 * L2TPv3 Session Header Over IP
102 *
103 * 0 1 2 3
104 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
105 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
106 * | Session ID |
107 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
108 * | Cookie (optional, maximum 64 bits)...
109 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
110 * |
111 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
112 *
113 * L2TPv3 Control Message Header Over IP
114 *
115 * 0 1 2 3
116 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
117 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
118 * | (32 bits of zeros) |
119 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
120 * |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length |
121 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
122 * | Control Connection ID |
123 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
124 * | Ns | Nr |
125 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
126 *
127 * All control frames are passed to userspace.
128 */
129static int l2tp_ip6_recv(struct sk_buff *skb)
130{
131 struct sock *sk;
132 u32 session_id;
133 u32 tunnel_id;
134 unsigned char *ptr, *optr;
135 struct l2tp_session *session;
136 struct l2tp_tunnel *tunnel = NULL;
137 int length;
a32e0eec
CE		 138
139 /* Point to L2TP header */
140 optr = ptr = skb->data;
141
142 if (!pskb_may_pull(skb, 4))
143 goto discard;
144
145 session_id = ntohl(*((__be32 *) ptr));
146 ptr += 4;
147
148 /* RFC3931: L2TP/IP packets have the first 4 bytes containing
149 * the session_id. If it is 0, the packet is a L2TP control
150 * frame and the session_id value can be discarded.
151 */
152 if (session_id == 0) {
153 __skb_pull(skb, 4);
154 goto pass_up;
155 }
156
157 /* Ok, this is a data packet. Lookup the session. */
158 session = l2tp_session_find(&init_net, NULL, session_id);
159 if (session == NULL)
160 goto discard;
161
162 tunnel = session->tunnel;
163 if (tunnel == NULL)
164 goto discard;
165
166 /* Trace packet contents, if enabled */
167 if (tunnel->debug & L2TP_MSG_DATA) {
168 length = min(32u, skb->len);
169 if (!pskb_may_pull(skb, length))
170 goto discard;
171
a4ca44fa
JP		 172 pr_debug("%s: ip recv\n", tunnel->name);
173 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
a32e0eec
CE		 174 }
175
176 l2tp_recv_common(session, skb, ptr, optr, 0, skb->len,
177 tunnel->recv_payload_hook);
178 return 0;
179
180pass_up:
181 /* Get the tunnel_id from the L2TP header */
182 if (!pskb_may_pull(skb, 12))
183 goto discard;
184
185 if ((skb->data[0] & 0xc0) != 0xc0)
186 goto discard;
187
188 tunnel_id = ntohl(*(__be32 *) &skb->data[4]);
189 tunnel = l2tp_tunnel_find(&init_net, tunnel_id);
190 if (tunnel != NULL)
191 sk = tunnel->sock;
192 else {
193 struct ipv6hdr *iph = ipv6_hdr(skb);
194
195 read_lock_bh(&l2tp_ip6_lock);
196 sk = __l2tp_ip6_bind_lookup(&init_net, &iph->daddr,
197 0, tunnel_id);
198 read_unlock_bh(&l2tp_ip6_lock);
199 }
200
201 if (sk == NULL)
202 goto discard;
203
204 sock_hold(sk);
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_put:
214 sock_put(sk);
215
216discard:
217 kfree_skb(skb);
218 return 0;
219}
220
221static int l2tp_ip6_open(struct sock *sk)
222{
223 /* Prevent autobind. We don't have ports. */
224 inet_sk(sk)->inet_num = IPPROTO_L2TP;
225
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
233static void l2tp_ip6_close(struct sock *sk, long timeout)
234{
235 write_lock_bh(&l2tp_ip6_lock);
236 hlist_del_init(&sk->sk_bind_node);
237 sk_del_node_init(sk);
238 write_unlock_bh(&l2tp_ip6_lock);
239
240 sk_common_release(sk);
241}
242
243static void l2tp_ip6_destroy_sock(struct sock *sk)
244{
93606317
TP		 245 struct l2tp_tunnel *tunnel = l2tp_sock_to_tunnel(sk);
246
a32e0eec
CE		 247 lock_sock(sk);
248 ip6_flush_pending_frames(sk);
249 release_sock(sk);
250
93606317
TP		 251 if (tunnel) {
252 l2tp_tunnel_closeall(tunnel);
253 sock_put(sk);
254 }
255
a32e0eec
CE		 256 inet6_destroy_sock(sk);
257}
258
259static int l2tp_ip6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
260{
261 struct inet_sock *inet = inet_sk(sk);
262 struct ipv6_pinfo *np = inet6_sk(sk);
263 struct sockaddr_l2tpip6 *addr = (struct sockaddr_l2tpip6 *) uaddr;
264 __be32 v4addr = 0;
265 int addr_type;
266 int err;
267
c51ce497
JC		 268 if (!sock_flag(sk, SOCK_ZAPPED))
269 return -EINVAL;
270 if (addr->l2tp_family != AF_INET6)
271 return -EINVAL;
a32e0eec
CE		 272 if (addr_len < sizeof(*addr))
273 return -EINVAL;
274
275 addr_type = ipv6_addr_type(&addr->l2tp_addr);
276
277 /* l2tp_ip6 sockets are IPv6 only */
278 if (addr_type == IPV6_ADDR_MAPPED)
279 return -EADDRNOTAVAIL;
280
281 /* L2TP is point-point, not multicast */
282 if (addr_type & IPV6_ADDR_MULTICAST)
283 return -EADDRNOTAVAIL;
284
285 err = -EADDRINUSE;
286 read_lock_bh(&l2tp_ip6_lock);
287 if (__l2tp_ip6_bind_lookup(&init_net, &addr->l2tp_addr,
288 sk->sk_bound_dev_if, addr->l2tp_conn_id))
289 goto out_in_use;
290 read_unlock_bh(&l2tp_ip6_lock);
291
292 lock_sock(sk);
293
294 err = -EINVAL;
295 if (sk->sk_state != TCP_CLOSE)
296 goto out_unlock;
297
298 /* Check if the address belongs to the host. */
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_len >= sizeof(struct sockaddr_in6) &&
305 addr->l2tp_scope_id) {
306 /* Override any existing binding, if another
307 * one is supplied by user.
308 */
309 sk->sk_bound_dev_if = addr->l2tp_scope_id;
310 }
311
312 /* Binding to link-local address requires an
313 interface */
314 if (!sk->sk_bound_dev_if)
315 goto out_unlock_rcu;
316
317 err = -ENODEV;
318 dev = dev_get_by_index_rcu(sock_net(sk),
319 sk->sk_bound_dev_if);
320 if (!dev)
321 goto out_unlock_rcu;
322 }
323
324 /* ipv4 addr of the socket is invalid. Only the
325 * unspecified and mapped address have a v4 equivalent.
326 */
327 v4addr = LOOPBACK4_IPV6;
328 err = -EADDRNOTAVAIL;
329 if (!ipv6_chk_addr(sock_net(sk), &addr->l2tp_addr, dev, 0))
330 goto out_unlock_rcu;
331 }
332 rcu_read_unlock();
333
334 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
efe4208f 335 sk->sk_v6_rcv_saddr = addr->l2tp_addr;
a32e0eec
CE		 336 np->saddr = addr->l2tp_addr;
337
338 l2tp_ip6_sk(sk)->conn_id = addr->l2tp_conn_id;
339
340 write_lock_bh(&l2tp_ip6_lock);
341 sk_add_bind_node(sk, &l2tp_ip6_bind_table);
342 sk_del_node_init(sk);
343 write_unlock_bh(&l2tp_ip6_lock);
344
c51ce497 345 sock_reset_flag(sk, SOCK_ZAPPED);
a32e0eec
CE		 346 release_sock(sk);
347 return 0;
348
349out_unlock_rcu:
350 rcu_read_unlock();
351out_unlock:
352 release_sock(sk);
353 return err;
354
355out_in_use:
356 read_unlock_bh(&l2tp_ip6_lock);
357 return err;
358}
359
360static int l2tp_ip6_connect(struct sock *sk, struct sockaddr *uaddr,
361 int addr_len)
362{
363 struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *) uaddr;
364 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
365 struct in6_addr *daddr;
366 int addr_type;
367 int rc;
368
c51ce497
JC		 369 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
370 return -EINVAL;
371
a32e0eec
CE		 372 if (addr_len < sizeof(*lsa))
373 return -EINVAL;
374
82b276cd
HFS		 375 if (usin->sin6_family != AF_INET6)
376 return -EINVAL;
377
a32e0eec
CE		 378 addr_type = ipv6_addr_type(&usin->sin6_addr);
379 if (addr_type & IPV6_ADDR_MULTICAST)
380 return -EINVAL;
381
382 if (addr_type & IPV6_ADDR_MAPPED) {
383 daddr = &usin->sin6_addr;
384 if (ipv4_is_multicast(daddr->s6_addr32[3]))
385 return -EINVAL;
386 }
387
388 rc = ip6_datagram_connect(sk, uaddr, addr_len);
389
390 lock_sock(sk);
391
392 l2tp_ip6_sk(sk)->peer_conn_id = lsa->l2tp_conn_id;
393
394 write_lock_bh(&l2tp_ip6_lock);
395 hlist_del_init(&sk->sk_bind_node);
396 sk_add_bind_node(sk, &l2tp_ip6_bind_table);
397 write_unlock_bh(&l2tp_ip6_lock);
398
399 release_sock(sk);
400
401 return rc;
402}
403
c51ce497
JC		 404static int l2tp_ip6_disconnect(struct sock *sk, int flags)
405{
406 if (sock_flag(sk, SOCK_ZAPPED))
407 return 0;
408
409 return udp_disconnect(sk, flags);
410}
411
a32e0eec
CE		 412static int l2tp_ip6_getname(struct socket *sock, struct sockaddr *uaddr,
413 int *uaddr_len, int peer)
414{
415 struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *)uaddr;
416 struct sock *sk = sock->sk;
417 struct ipv6_pinfo *np = inet6_sk(sk);
418 struct l2tp_ip6_sock *lsk = l2tp_ip6_sk(sk);
419
420 lsa->l2tp_family = AF_INET6;
421 lsa->l2tp_flowinfo = 0;
422 lsa->l2tp_scope_id = 0;
04d4fbca 423 lsa->l2tp_unused = 0;
a32e0eec
CE		 424 if (peer) {
425 if (!lsk->peer_conn_id)
426 return -ENOTCONN;
427 lsa->l2tp_conn_id = lsk->peer_conn_id;
efe4208f 428 lsa->l2tp_addr = sk->sk_v6_daddr;
a32e0eec
CE		 429 if (np->sndflow)
430 lsa->l2tp_flowinfo = np->flow_label;
431 } else {
efe4208f 432 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
a32e0eec
CE		 433 lsa->l2tp_addr = np->saddr;
434 else
efe4208f 435 lsa->l2tp_addr = sk->sk_v6_rcv_saddr;
a32e0eec
CE		 436
437 lsa->l2tp_conn_id = lsk->conn_id;
438 }
439 if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL)
440 lsa->l2tp_scope_id = sk->sk_bound_dev_if;
441 *uaddr_len = sizeof(*lsa);
442 return 0;
443}
444
445static int l2tp_ip6_backlog_recv(struct sock *sk, struct sk_buff *skb)
446{
447 int rc;
448
449 /* Charge it to the socket, dropping if the queue is full. */
450 rc = sock_queue_rcv_skb(sk, skb);
451 if (rc < 0)
452 goto drop;
453
454 return 0;
455
456drop:
457 IP_INC_STATS(&init_net, IPSTATS_MIB_INDISCARDS);
458 kfree_skb(skb);
459 return -1;
460}
461
462static int l2tp_ip6_push_pending_frames(struct sock *sk)
463{
464 struct sk_buff *skb;
465 __be32 *transhdr = NULL;
466 int err = 0;
467
468 skb = skb_peek(&sk->sk_write_queue);
469 if (skb == NULL)
470 goto out;
471
472 transhdr = (__be32 *)skb_transport_header(skb);
473 *transhdr = 0;
474
475 err = ip6_push_pending_frames(sk);
476
477out:
478 return err;
479}
480
481/* Userspace will call sendmsg() on the tunnel socket to send L2TP
482 * control frames.
483 */
1b784140 484static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
a32e0eec
CE		 485{
486 struct ipv6_txoptions opt_space;
342dfc30 487 DECLARE_SOCKADDR(struct sockaddr_l2tpip6 *, lsa, msg->msg_name);
a32e0eec
CE		 488 struct in6_addr *daddr, *final_p, final;
489 struct ipv6_pinfo *np = inet6_sk(sk);
45f6fad8 490 struct ipv6_txoptions *opt_to_free = NULL;
a32e0eec
CE		 491 struct ipv6_txoptions *opt = NULL;
492 struct ip6_flowlabel *flowlabel = NULL;
493 struct dst_entry *dst = NULL;
494 struct flowi6 fl6;
495 int addr_len = msg->msg_namelen;
496 int hlimit = -1;
497 int tclass = -1;
498 int dontfrag = -1;
499 int transhdrlen = 4; /* zero session-id */
500 int ulen = len + transhdrlen;
501 int err;
502
503 /* Rough check on arithmetic overflow,
504 better check is made in ip6_append_data().
505 */
506 if (len > INT_MAX)
507 return -EMSGSIZE;
508
509 /* Mirror BSD error message compatibility */
510 if (msg->msg_flags & MSG_OOB)
511 return -EOPNOTSUPP;
512
513 /*
514 * Get and verify the address.
515 */
516 memset(&fl6, 0, sizeof(fl6));
517
518 fl6.flowi6_mark = sk->sk_mark;
519
520 if (lsa) {
521 if (addr_len < SIN6_LEN_RFC2133)
522 return -EINVAL;
523
524 if (lsa->l2tp_family && lsa->l2tp_family != AF_INET6)
525 return -EAFNOSUPPORT;
526
527 daddr = &lsa->l2tp_addr;
528 if (np->sndflow) {
529 fl6.flowlabel = lsa->l2tp_flowinfo & IPV6_FLOWINFO_MASK;
530 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
531 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
532 if (flowlabel == NULL)
533 return -EINVAL;
a32e0eec
CE		 534 }
535 }
536
537 /*
538 * Otherwise it will be difficult to maintain
539 * sk->sk_dst_cache.
540 */
541 if (sk->sk_state == TCP_ESTABLISHED &&
efe4208f
ED		 542 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
543 daddr = &sk->sk_v6_daddr;
a32e0eec
CE		 544
545 if (addr_len >= sizeof(struct sockaddr_in6) &&
546 lsa->l2tp_scope_id &&
547 ipv6_addr_type(daddr) & IPV6_ADDR_LINKLOCAL)
548 fl6.flowi6_oif = lsa->l2tp_scope_id;
549 } else {
550 if (sk->sk_state != TCP_ESTABLISHED)
551 return -EDESTADDRREQ;
552
efe4208f 553 daddr = &sk->sk_v6_daddr;
a32e0eec
CE		 554 fl6.flowlabel = np->flow_label;
555 }
556
557 if (fl6.flowi6_oif == 0)
558 fl6.flowi6_oif = sk->sk_bound_dev_if;
559
560 if (msg->msg_controllen) {
561 opt = &opt_space;
562 memset(opt, 0, sizeof(struct ipv6_txoptions));
563 opt->tot_len = sizeof(struct ipv6_txoptions);
564
73df66f8
TP		 565 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
566 &hlimit, &tclass, &dontfrag);
a32e0eec
CE		 567 if (err < 0) {
568 fl6_sock_release(flowlabel);
569 return err;
570 }
571 if ((fl6.flowlabel & IPV6_FLOWLABEL_MASK) && !flowlabel) {
572 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
573 if (flowlabel == NULL)
574 return -EINVAL;
575 }
576 if (!(opt->opt_nflen|opt->opt_flen))
577 opt = NULL;
578 }
579
45f6fad8
ED		 580 if (!opt) {
581 opt = txopt_get(np);
582 opt_to_free = opt;
583 }
a32e0eec
CE		 584 if (flowlabel)
585 opt = fl6_merge_options(&opt_space, flowlabel, opt);
586 opt = ipv6_fixup_options(&opt_space, opt);
587
588 fl6.flowi6_proto = sk->sk_protocol;
589 if (!ipv6_addr_any(daddr))
590 fl6.daddr = *daddr;
591 else
592 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
593 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
594 fl6.saddr = np->saddr;
595
596 final_p = fl6_update_dst(&fl6, opt, &final);
597
598 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
599 fl6.flowi6_oif = np->mcast_oif;
600 else if (!fl6.flowi6_oif)
601 fl6.flowi6_oif = np->ucast_oif;
602
603 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
604
0e0d44ab 605 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
a32e0eec
CE		 606 if (IS_ERR(dst)) {
607 err = PTR_ERR(dst);
608 goto out;
609 }
610
5c98631c
LC		 611 if (hlimit < 0)
612 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
a32e0eec
CE		 613
614 if (tclass < 0)
615 tclass = np->tclass;
616
617 if (dontfrag < 0)
618 dontfrag = np->dontfrag;
619
620 if (msg->msg_flags & MSG_CONFIRM)
621 goto do_confirm;
622
623back_from_confirm:
624 lock_sock(sk);
f69e6d13 625 err = ip6_append_data(sk, ip_generic_getfrag, msg,
a32e0eec
CE		 626 ulen, transhdrlen, hlimit, tclass, opt,
627 &fl6, (struct rt6_info *)dst,
628 msg->msg_flags, dontfrag);
629 if (err)
630 ip6_flush_pending_frames(sk);
631 else if (!(msg->msg_flags & MSG_MORE))
632 err = l2tp_ip6_push_pending_frames(sk);
633 release_sock(sk);
634done:
635 dst_release(dst);
636out:
637 fl6_sock_release(flowlabel);
45f6fad8 638 txopt_put(opt_to_free);
a32e0eec
CE		 639
640 return err < 0 ? err : len;
641
642do_confirm:
643 dst_confirm(dst);
644 if (!(msg->msg_flags & MSG_PROBE) || len)
645 goto back_from_confirm;
646 err = 0;
647 goto done;
648}
649
1b784140
YX		 650static int l2tp_ip6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
651 int noblock, int flags, int *addr_len)
a32e0eec 652{
700163db 653 struct ipv6_pinfo *np = inet6_sk(sk);
342dfc30 654 DECLARE_SOCKADDR(struct sockaddr_l2tpip6 *, lsa, msg->msg_name);
a32e0eec
CE		 655 size_t copied = 0;
656 int err = -EOPNOTSUPP;
657 struct sk_buff *skb;
658
659 if (flags & MSG_OOB)
660 goto out;
661
662 if (addr_len)
663 *addr_len = sizeof(*lsa);
664
665 if (flags & MSG_ERRQUEUE)
85fbaa75 666 return ipv6_recv_error(sk, msg, len, addr_len);
a32e0eec
CE		 667
668 skb = skb_recv_datagram(sk, flags, noblock, &err);
669 if (!skb)
670 goto out;
671
672 copied = skb->len;
673 if (len < copied) {
674 msg->msg_flags |= MSG_TRUNC;
675 copied = len;
676 }
677
51f3d02b 678 err = skb_copy_datagram_msg(skb, 0, msg, copied);
a32e0eec
CE		 679 if (err)
680 goto done;
681
682 sock_recv_timestamp(msg, sk, skb);
683
684 /* Copy the address. */
685 if (lsa) {
686 lsa->l2tp_family = AF_INET6;
687 lsa->l2tp_unused = 0;
688 lsa->l2tp_addr = ipv6_hdr(skb)->saddr;
689 lsa->l2tp_flowinfo = 0;
690 lsa->l2tp_scope_id = 0;
b860d3cc 691 lsa->l2tp_conn_id = 0;
a32e0eec 692 if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL)
4330487a 693 lsa->l2tp_scope_id = inet6_iif(skb);
a32e0eec
CE		 694 }
695
700163db
TP		 696 if (np->rxopt.all)
697 ip6_datagram_recv_ctl(sk, msg, skb);
a32e0eec
CE		 698
699 if (flags & MSG_TRUNC)
700 copied = skb->len;
701done:
702 skb_free_datagram(sk, skb);
703out:
704 return err ? err : copied;
705}
706
707static struct proto l2tp_ip6_prot = {
708 .name = "L2TP/IPv6",
709 .owner = THIS_MODULE,
710 .init = l2tp_ip6_open,
711 .close = l2tp_ip6_close,
712 .bind = l2tp_ip6_bind,
713 .connect = l2tp_ip6_connect,
c51ce497 714 .disconnect = l2tp_ip6_disconnect,
a32e0eec
CE		 715 .ioctl = udp_ioctl,
716 .destroy = l2tp_ip6_destroy_sock,
717 .setsockopt = ipv6_setsockopt,
718 .getsockopt = ipv6_getsockopt,
719 .sendmsg = l2tp_ip6_sendmsg,
720 .recvmsg = l2tp_ip6_recvmsg,
721 .backlog_rcv = l2tp_ip6_backlog_recv,
496611d7 722 .hash = inet6_hash,
a32e0eec
CE		 723 .unhash = inet_unhash,
724 .obj_size = sizeof(struct l2tp_ip6_sock),
725#ifdef CONFIG_COMPAT
726 .compat_setsockopt = compat_ipv6_setsockopt,
727 .compat_getsockopt = compat_ipv6_getsockopt,
728#endif
729};
730
731static const struct proto_ops l2tp_ip6_ops = {
732 .family = PF_INET6,
733 .owner = THIS_MODULE,
734 .release = inet6_release,
735 .bind = inet6_bind,
736 .connect = inet_dgram_connect,
737 .socketpair = sock_no_socketpair,
738 .accept = sock_no_accept,
739 .getname = l2tp_ip6_getname,
740 .poll = datagram_poll,
741 .ioctl = inet6_ioctl,
742 .listen = sock_no_listen,
743 .shutdown = inet_shutdown,
744 .setsockopt = sock_common_setsockopt,
745 .getsockopt = sock_common_getsockopt,
746 .sendmsg = inet_sendmsg,
747 .recvmsg = sock_common_recvmsg,
748 .mmap = sock_no_mmap,
749 .sendpage = sock_no_sendpage,
750#ifdef CONFIG_COMPAT
751 .compat_setsockopt = compat_sock_common_setsockopt,
752 .compat_getsockopt = compat_sock_common_getsockopt,
753#endif
754};
755
756static struct inet_protosw l2tp_ip6_protosw = {
757 .type = SOCK_DGRAM,
758 .protocol = IPPROTO_L2TP,
759 .prot = &l2tp_ip6_prot,
760 .ops = &l2tp_ip6_ops,
a32e0eec
CE		 761};
762
763static struct inet6_protocol l2tp_ip6_protocol __read_mostly = {
764 .handler = l2tp_ip6_recv,
765};
766
767static int __init l2tp_ip6_init(void)
768{
769 int err;
770
a4ca44fa 771 pr_info("L2TP IP encapsulation support for IPv6 (L2TPv3)\n");
a32e0eec
CE		 772
773 err = proto_register(&l2tp_ip6_prot, 1);
774 if (err != 0)
775 goto out;
776
777 err = inet6_add_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP);
778 if (err)
779 goto out1;
780
781 inet6_register_protosw(&l2tp_ip6_protosw);
782 return 0;
783
784out1:
785 proto_unregister(&l2tp_ip6_prot);
786out:
787 return err;
788}
789
790static void __exit l2tp_ip6_exit(void)
791{
792 inet6_unregister_protosw(&l2tp_ip6_protosw);
793 inet6_del_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP);
794 proto_unregister(&l2tp_ip6_prot);
795}
796
797module_init(l2tp_ip6_init);
798module_exit(l2tp_ip6_exit);
799
800MODULE_LICENSE("GPL");
801MODULE_AUTHOR("Chris Elston <celston@katalix.com>");
802MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6");
803MODULE_VERSION("1.0");
804
805/* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
806 * enums
807 */
808MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 2, IPPROTO_L2TP);
163c2e25 809MODULE_ALIAS_NET_PF_PROTO(PF_INET6, IPPROTO_L2TP);
Linux kernel - Deliverables
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