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import PULS_20180308
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
28#include <net/tcp_states.h>
29#include <net/protocol.h>
30#include <net/xfrm.h>
31
32#include <net/transp_v6.h>
33#include <net/addrconf.h>
34#include <net/ip6_route.h>
35
36#include "l2tp_core.h"
37
38struct l2tp_ip6_sock {
39 /* inet_sock has to be the first member of l2tp_ip6_sock */
40 struct inet_sock inet;
41
42 u32 conn_id;
43 u32 peer_conn_id;
44
45 /* ipv6_pinfo has to be the last member of l2tp_ip6_sock, see
46 inet6_sk_generic */
47 struct ipv6_pinfo inet6;
48};
49
50static DEFINE_RWLOCK(l2tp_ip6_lock);
51static struct hlist_head l2tp_ip6_table;
52static struct hlist_head l2tp_ip6_bind_table;
53
54static inline struct l2tp_ip6_sock *l2tp_ip6_sk(const struct sock *sk)
55{
56 return (struct l2tp_ip6_sock *)sk;
57}
58
59static struct sock *__l2tp_ip6_bind_lookup(struct net *net,
60 struct in6_addr *laddr,
61 int dif, u32 tunnel_id)
62{
a32e0eec
CE		 63 struct sock *sk;
64
b67bfe0d 65 sk_for_each_bound(sk, &l2tp_ip6_bind_table) {
a32e0eec
CE		 66 struct in6_addr *addr = inet6_rcv_saddr(sk);
67 struct l2tp_ip6_sock *l2tp = l2tp_ip6_sk(sk);
68
69 if (l2tp == NULL)
70 continue;
71
72 if ((l2tp->conn_id == tunnel_id) &&
73 net_eq(sock_net(sk), net) &&
74 !(addr && ipv6_addr_equal(addr, laddr)) &&
75 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
76 goto found;
77 }
78
79 sk = NULL;
80found:
81 return sk;
82}
83
84static inline struct sock *l2tp_ip6_bind_lookup(struct net *net,
85 struct in6_addr *laddr,
86 int dif, u32 tunnel_id)
87{
88 struct sock *sk = __l2tp_ip6_bind_lookup(net, laddr, dif, tunnel_id);
89 if (sk)
90 sock_hold(sk);
91
92 return sk;
93}
94
95/* When processing receive frames, there are two cases to
96 * consider. Data frames consist of a non-zero session-id and an
97 * optional cookie. Control frames consist of a regular L2TP header
98 * preceded by 32-bits of zeros.
99 *
100 * L2TPv3 Session Header Over IP
101 *
102 * 0 1 2 3
103 * 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
104 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
105 * | Session ID |
106 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
107 * | Cookie (optional, maximum 64 bits)...
108 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
109 * |
110 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
111 *
112 * L2TPv3 Control Message Header Over IP
113 *
114 * 0 1 2 3
115 * 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
116 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
117 * | (32 bits of zeros) |
118 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
119 * |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length |
120 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
121 * | Control Connection ID |
122 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
123 * | Ns | Nr |
124 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
125 *
126 * All control frames are passed to userspace.
127 */
128static int l2tp_ip6_recv(struct sk_buff *skb)
129{
130 struct sock *sk;
131 u32 session_id;
132 u32 tunnel_id;
133 unsigned char *ptr, *optr;
134 struct l2tp_session *session;
135 struct l2tp_tunnel *tunnel = NULL;
136 int length;
a32e0eec
CE		 137
138 /* Point to L2TP header */
139 optr = ptr = skb->data;
140
141 if (!pskb_may_pull(skb, 4))
142 goto discard;
143
144 session_id = ntohl(*((__be32 *) ptr));
145 ptr += 4;
146
147 /* RFC3931: L2TP/IP packets have the first 4 bytes containing
148 * the session_id. If it is 0, the packet is a L2TP control
149 * frame and the session_id value can be discarded.
150 */
151 if (session_id == 0) {
152 __skb_pull(skb, 4);
153 goto pass_up;
154 }
155
156 /* Ok, this is a data packet. Lookup the session. */
157 session = l2tp_session_find(&init_net, NULL, session_id);
158 if (session == NULL)
159 goto discard;
160
161 tunnel = session->tunnel;
162 if (tunnel == NULL)
163 goto discard;
164
165 /* Trace packet contents, if enabled */
166 if (tunnel->debug & L2TP_MSG_DATA) {
167 length = min(32u, skb->len);
168 if (!pskb_may_pull(skb, length))
169 goto discard;
170
a4ca44fa
JP		 171 pr_debug("%s: ip recv\n", tunnel->name);
172 print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
a32e0eec
CE		 173 }
174
175 l2tp_recv_common(session, skb, ptr, optr, 0, skb->len,
176 tunnel->recv_payload_hook);
177 return 0;
178
179pass_up:
180 /* Get the tunnel_id from the L2TP header */
181 if (!pskb_may_pull(skb, 12))
182 goto discard;
183
184 if ((skb->data[0] & 0xc0) != 0xc0)
185 goto discard;
186
187 tunnel_id = ntohl(*(__be32 *) &skb->data[4]);
188 tunnel = l2tp_tunnel_find(&init_net, tunnel_id);
189 if (tunnel != NULL)
190 sk = tunnel->sock;
191 else {
192 struct ipv6hdr *iph = ipv6_hdr(skb);
193
194 read_lock_bh(&l2tp_ip6_lock);
195 sk = __l2tp_ip6_bind_lookup(&init_net, &iph->daddr,
196 0, tunnel_id);
197 read_unlock_bh(&l2tp_ip6_lock);
198 }
199
200 if (sk == NULL)
201 goto discard;
202
203 sock_hold(sk);
204
205 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
206 goto discard_put;
207
208 nf_reset(skb);
209
210 return sk_receive_skb(sk, skb, 1);
211
212discard_put:
213 sock_put(sk);
214
215discard:
216 kfree_skb(skb);
217 return 0;
218}
219
220static int l2tp_ip6_open(struct sock *sk)
221{
222 /* Prevent autobind. We don't have ports. */
223 inet_sk(sk)->inet_num = IPPROTO_L2TP;
224
225 write_lock_bh(&l2tp_ip6_lock);
226 sk_add_node(sk, &l2tp_ip6_table);
227 write_unlock_bh(&l2tp_ip6_lock);
228
229 return 0;
230}
231
232static void l2tp_ip6_close(struct sock *sk, long timeout)
233{
234 write_lock_bh(&l2tp_ip6_lock);
235 hlist_del_init(&sk->sk_bind_node);
236 sk_del_node_init(sk);
237 write_unlock_bh(&l2tp_ip6_lock);
238
239 sk_common_release(sk);
240}
241
242static void l2tp_ip6_destroy_sock(struct sock *sk)
243{
93606317
TP		 244 struct l2tp_tunnel *tunnel = l2tp_sock_to_tunnel(sk);
245
a32e0eec
CE		 246 lock_sock(sk);
247 ip6_flush_pending_frames(sk);
248 release_sock(sk);
249
93606317
TP		 250 if (tunnel) {
251 l2tp_tunnel_closeall(tunnel);
252 sock_put(sk);
253 }
254
a32e0eec
CE		 255 inet6_destroy_sock(sk);
256}
257
258static int l2tp_ip6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
259{
260 struct inet_sock *inet = inet_sk(sk);
261 struct ipv6_pinfo *np = inet6_sk(sk);
262 struct sockaddr_l2tpip6 *addr = (struct sockaddr_l2tpip6 *) uaddr;
263 __be32 v4addr = 0;
264 int addr_type;
265 int err;
266
c51ce497
JC		 267 if (addr->l2tp_family != AF_INET6)
268 return -EINVAL;
a32e0eec
CE		 269 if (addr_len < sizeof(*addr))
270 return -EINVAL;
271
272 addr_type = ipv6_addr_type(&addr->l2tp_addr);
273
274 /* l2tp_ip6 sockets are IPv6 only */
275 if (addr_type == IPV6_ADDR_MAPPED)
276 return -EADDRNOTAVAIL;
277
278 /* L2TP is point-point, not multicast */
279 if (addr_type & IPV6_ADDR_MULTICAST)
280 return -EADDRNOTAVAIL;
281
282 err = -EADDRINUSE;
283 read_lock_bh(&l2tp_ip6_lock);
284 if (__l2tp_ip6_bind_lookup(&init_net, &addr->l2tp_addr,
285 sk->sk_bound_dev_if, addr->l2tp_conn_id))
286 goto out_in_use;
287 read_unlock_bh(&l2tp_ip6_lock);
288
289 lock_sock(sk);
290
291 err = -EINVAL;
4b9e9796
S		 292 if (!sock_flag(sk, SOCK_ZAPPED))
293 goto out_unlock;
294
a32e0eec
CE		 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;
335 np->rcv_saddr = addr->l2tp_addr;
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
375 addr_type = ipv6_addr_type(&usin->sin6_addr);
376 if (addr_type & IPV6_ADDR_MULTICAST)
377 return -EINVAL;
378
379 if (addr_type & IPV6_ADDR_MAPPED) {
380 daddr = &usin->sin6_addr;
381 if (ipv4_is_multicast(daddr->s6_addr32[3]))
382 return -EINVAL;
383 }
384
385 rc = ip6_datagram_connect(sk, uaddr, addr_len);
386
387 lock_sock(sk);
388
389 l2tp_ip6_sk(sk)->peer_conn_id = lsa->l2tp_conn_id;
390
391 write_lock_bh(&l2tp_ip6_lock);
392 hlist_del_init(&sk->sk_bind_node);
393 sk_add_bind_node(sk, &l2tp_ip6_bind_table);
394 write_unlock_bh(&l2tp_ip6_lock);
395
396 release_sock(sk);
397
398 return rc;
399}
400
c51ce497
JC		 401static int l2tp_ip6_disconnect(struct sock *sk, int flags)
402{
403 if (sock_flag(sk, SOCK_ZAPPED))
404 return 0;
405
406 return udp_disconnect(sk, flags);
407}
408
a32e0eec
CE		 409static int l2tp_ip6_getname(struct socket *sock, struct sockaddr *uaddr,
410 int *uaddr_len, int peer)
411{
412 struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *)uaddr;
413 struct sock *sk = sock->sk;
414 struct ipv6_pinfo *np = inet6_sk(sk);
415 struct l2tp_ip6_sock *lsk = l2tp_ip6_sk(sk);
416
417 lsa->l2tp_family = AF_INET6;
418 lsa->l2tp_flowinfo = 0;
419 lsa->l2tp_scope_id = 0;
04d4fbca 420 lsa->l2tp_unused = 0;
a32e0eec
CE		 421 if (peer) {
422 if (!lsk->peer_conn_id)
423 return -ENOTCONN;
424 lsa->l2tp_conn_id = lsk->peer_conn_id;
425 lsa->l2tp_addr = np->daddr;
426 if (np->sndflow)
427 lsa->l2tp_flowinfo = np->flow_label;
428 } else {
429 if (ipv6_addr_any(&np->rcv_saddr))
430 lsa->l2tp_addr = np->saddr;
431 else
432 lsa->l2tp_addr = np->rcv_saddr;
433
434 lsa->l2tp_conn_id = lsk->conn_id;
435 }
436 if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL)
437 lsa->l2tp_scope_id = sk->sk_bound_dev_if;
438 *uaddr_len = sizeof(*lsa);
439 return 0;
440}
441
442static int l2tp_ip6_backlog_recv(struct sock *sk, struct sk_buff *skb)
443{
444 int rc;
445
446 /* Charge it to the socket, dropping if the queue is full. */
447 rc = sock_queue_rcv_skb(sk, skb);
448 if (rc < 0)
449 goto drop;
450
451 return 0;
452
453drop:
454 IP_INC_STATS(&init_net, IPSTATS_MIB_INDISCARDS);
455 kfree_skb(skb);
456 return -1;
457}
458
459static int l2tp_ip6_push_pending_frames(struct sock *sk)
460{
461 struct sk_buff *skb;
462 __be32 *transhdr = NULL;
463 int err = 0;
464
465 skb = skb_peek(&sk->sk_write_queue);
466 if (skb == NULL)
467 goto out;
468
469 transhdr = (__be32 *)skb_transport_header(skb);
470 *transhdr = 0;
471
472 err = ip6_push_pending_frames(sk);
473
474out:
475 return err;
476}
477
478/* Userspace will call sendmsg() on the tunnel socket to send L2TP
479 * control frames.
480 */
481static int l2tp_ip6_sendmsg(struct kiocb *iocb, struct sock *sk,
482 struct msghdr *msg, size_t len)
483{
484 struct ipv6_txoptions opt_space;
485 struct sockaddr_l2tpip6 *lsa =
486 (struct sockaddr_l2tpip6 *) msg->msg_name;
487 struct in6_addr *daddr, *final_p, final;
488 struct ipv6_pinfo *np = inet6_sk(sk);
489 struct ipv6_txoptions *opt = NULL;
490 struct ip6_flowlabel *flowlabel = NULL;
491 struct dst_entry *dst = NULL;
492 struct flowi6 fl6;
493 int addr_len = msg->msg_namelen;
494 int hlimit = -1;
495 int tclass = -1;
496 int dontfrag = -1;
497 int transhdrlen = 4; /* zero session-id */
498 int ulen = len + transhdrlen;
499 int err;
500
501 /* Rough check on arithmetic overflow,
502 better check is made in ip6_append_data().
503 */
504 if (len > INT_MAX)
505 return -EMSGSIZE;
506
507 /* Mirror BSD error message compatibility */
508 if (msg->msg_flags & MSG_OOB)
509 return -EOPNOTSUPP;
510
511 /*
512 * Get and verify the address.
513 */
514 memset(&fl6, 0, sizeof(fl6));
515
516 fl6.flowi6_mark = sk->sk_mark;
517
518 if (lsa) {
519 if (addr_len < SIN6_LEN_RFC2133)
520 return -EINVAL;
521
522 if (lsa->l2tp_family && lsa->l2tp_family != AF_INET6)
523 return -EAFNOSUPPORT;
524
525 daddr = &lsa->l2tp_addr;
526 if (np->sndflow) {
527 fl6.flowlabel = lsa->l2tp_flowinfo & IPV6_FLOWINFO_MASK;
528 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
529 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
530 if (flowlabel == NULL)
531 return -EINVAL;
532 daddr = &flowlabel->dst;
533 }
534 }
535
536 /*
537 * Otherwise it will be difficult to maintain
538 * sk->sk_dst_cache.
539 */
540 if (sk->sk_state == TCP_ESTABLISHED &&
541 ipv6_addr_equal(daddr, &np->daddr))
542 daddr = &np->daddr;
543
544 if (addr_len >= sizeof(struct sockaddr_in6) &&
545 lsa->l2tp_scope_id &&
546 ipv6_addr_type(daddr) & IPV6_ADDR_LINKLOCAL)
547 fl6.flowi6_oif = lsa->l2tp_scope_id;
548 } else {
549 if (sk->sk_state != TCP_ESTABLISHED)
550 return -EDESTADDRREQ;
551
552 daddr = &np->daddr;
553 fl6.flowlabel = np->flow_label;
554 }
555
556 if (fl6.flowi6_oif == 0)
557 fl6.flowi6_oif = sk->sk_bound_dev_if;
558
559 if (msg->msg_controllen) {
560 opt = &opt_space;
561 memset(opt, 0, sizeof(struct ipv6_txoptions));
562 opt->tot_len = sizeof(struct ipv6_txoptions);
563
73df66f8
TP		 564 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
565 &hlimit, &tclass, &dontfrag);
a32e0eec
CE		 566 if (err < 0) {
567 fl6_sock_release(flowlabel);
568 return err;
569 }
570 if ((fl6.flowlabel & IPV6_FLOWLABEL_MASK) && !flowlabel) {
571 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
572 if (flowlabel == NULL)
573 return -EINVAL;
574 }
575 if (!(opt->opt_nflen|opt->opt_flen))
576 opt = NULL;
577 }
578
579 if (opt == NULL)
580 opt = np->opt;
581 if (flowlabel)
582 opt = fl6_merge_options(&opt_space, flowlabel, opt);
583 opt = ipv6_fixup_options(&opt_space, opt);
584
585 fl6.flowi6_proto = sk->sk_protocol;
586 if (!ipv6_addr_any(daddr))
587 fl6.daddr = *daddr;
588 else
589 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
590 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
591 fl6.saddr = np->saddr;
592
593 final_p = fl6_update_dst(&fl6, opt, &final);
594
595 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
596 fl6.flowi6_oif = np->mcast_oif;
597 else if (!fl6.flowi6_oif)
598 fl6.flowi6_oif = np->ucast_oif;
599
600 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
601
602 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
603 if (IS_ERR(dst)) {
604 err = PTR_ERR(dst);
605 goto out;
606 }
607
608 if (hlimit < 0) {
609 if (ipv6_addr_is_multicast(&fl6.daddr))
610 hlimit = np->mcast_hops;
611 else
612 hlimit = np->hop_limit;
613 if (hlimit < 0)
614 hlimit = ip6_dst_hoplimit(dst);
615 }
616
617 if (tclass < 0)
618 tclass = np->tclass;
619
620 if (dontfrag < 0)
621 dontfrag = np->dontfrag;
622
623 if (msg->msg_flags & MSG_CONFIRM)
624 goto do_confirm;
625
626back_from_confirm:
627 lock_sock(sk);
628 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
629 ulen, transhdrlen, hlimit, tclass, opt,
630 &fl6, (struct rt6_info *)dst,
631 msg->msg_flags, dontfrag);
632 if (err)
633 ip6_flush_pending_frames(sk);
634 else if (!(msg->msg_flags & MSG_MORE))
635 err = l2tp_ip6_push_pending_frames(sk);
636 release_sock(sk);
637done:
638 dst_release(dst);
639out:
640 fl6_sock_release(flowlabel);
641
642 return err < 0 ? err : len;
643
644do_confirm:
645 dst_confirm(dst);
646 if (!(msg->msg_flags & MSG_PROBE) || len)
647 goto back_from_confirm;
648 err = 0;
649 goto done;
650}
651
652static int l2tp_ip6_recvmsg(struct kiocb *iocb, struct sock *sk,
653 struct msghdr *msg, size_t len, int noblock,
654 int flags, int *addr_len)
655{
700163db 656 struct ipv6_pinfo *np = inet6_sk(sk);
a32e0eec
CE		 657 struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *)msg->msg_name;
658 size_t copied = 0;
659 int err = -EOPNOTSUPP;
660 struct sk_buff *skb;
661
662 if (flags & MSG_OOB)
663 goto out;
664
665 if (addr_len)
666 *addr_len = sizeof(*lsa);
667
668 if (flags & MSG_ERRQUEUE)
08c62a10 669 return ipv6_recv_error(sk, msg, len, addr_len);
a32e0eec
CE		 670
671 skb = skb_recv_datagram(sk, flags, noblock, &err);
672 if (!skb)
673 goto out;
674
675 copied = skb->len;
676 if (len < copied) {
677 msg->msg_flags |= MSG_TRUNC;
678 copied = len;
679 }
680
681 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
682 if (err)
683 goto done;
684
685 sock_recv_timestamp(msg, sk, skb);
686
687 /* Copy the address. */
688 if (lsa) {
689 lsa->l2tp_family = AF_INET6;
690 lsa->l2tp_unused = 0;
691 lsa->l2tp_addr = ipv6_hdr(skb)->saddr;
692 lsa->l2tp_flowinfo = 0;
693 lsa->l2tp_scope_id = 0;
b860d3cc 694 lsa->l2tp_conn_id = 0;
a32e0eec
CE		 695 if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL)
696 lsa->l2tp_scope_id = IP6CB(skb)->iif;
697 }
698
700163db
TP		 699 if (np->rxopt.all)
700 ip6_datagram_recv_ctl(sk, msg, skb);
a32e0eec
CE		 701
702 if (flags & MSG_TRUNC)
703 copied = skb->len;
704done:
705 skb_free_datagram(sk, skb);
706out:
707 return err ? err : copied;
708}
709
710static struct proto l2tp_ip6_prot = {
711 .name = "L2TP/IPv6",
712 .owner = THIS_MODULE,
713 .init = l2tp_ip6_open,
714 .close = l2tp_ip6_close,
715 .bind = l2tp_ip6_bind,
716 .connect = l2tp_ip6_connect,
c51ce497 717 .disconnect = l2tp_ip6_disconnect,
a32e0eec
CE		 718 .ioctl = udp_ioctl,
719 .destroy = l2tp_ip6_destroy_sock,
720 .setsockopt = ipv6_setsockopt,
721 .getsockopt = ipv6_getsockopt,
722 .sendmsg = l2tp_ip6_sendmsg,
723 .recvmsg = l2tp_ip6_recvmsg,
724 .backlog_rcv = l2tp_ip6_backlog_recv,
725 .hash = inet_hash,
726 .unhash = inet_unhash,
727 .obj_size = sizeof(struct l2tp_ip6_sock),
728#ifdef CONFIG_COMPAT
729 .compat_setsockopt = compat_ipv6_setsockopt,
730 .compat_getsockopt = compat_ipv6_getsockopt,
731#endif
732};
733
734static const struct proto_ops l2tp_ip6_ops = {
735 .family = PF_INET6,
736 .owner = THIS_MODULE,
737 .release = inet6_release,
738 .bind = inet6_bind,
739 .connect = inet_dgram_connect,
740 .socketpair = sock_no_socketpair,
741 .accept = sock_no_accept,
742 .getname = l2tp_ip6_getname,
743 .poll = datagram_poll,
744 .ioctl = inet6_ioctl,
745 .listen = sock_no_listen,
746 .shutdown = inet_shutdown,
747 .setsockopt = sock_common_setsockopt,
748 .getsockopt = sock_common_getsockopt,
749 .sendmsg = inet_sendmsg,
750 .recvmsg = sock_common_recvmsg,
751 .mmap = sock_no_mmap,
752 .sendpage = sock_no_sendpage,
753#ifdef CONFIG_COMPAT
754 .compat_setsockopt = compat_sock_common_setsockopt,
755 .compat_getsockopt = compat_sock_common_getsockopt,
756#endif
757};
758
759static struct inet_protosw l2tp_ip6_protosw = {
760 .type = SOCK_DGRAM,
761 .protocol = IPPROTO_L2TP,
762 .prot = &l2tp_ip6_prot,
763 .ops = &l2tp_ip6_ops,
764 .no_check = 0,
765};
766
767static struct inet6_protocol l2tp_ip6_protocol __read_mostly = {
768 .handler = l2tp_ip6_recv,
769};
770
771static int __init l2tp_ip6_init(void)
772{
773 int err;
774
a4ca44fa 775 pr_info("L2TP IP encapsulation support for IPv6 (L2TPv3)\n");
a32e0eec
CE		 776
777 err = proto_register(&l2tp_ip6_prot, 1);
778 if (err != 0)
779 goto out;
780
781 err = inet6_add_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP);
782 if (err)
783 goto out1;
784
785 inet6_register_protosw(&l2tp_ip6_protosw);
786 return 0;
787
788out1:
789 proto_unregister(&l2tp_ip6_prot);
790out:
791 return err;
792}
793
794static void __exit l2tp_ip6_exit(void)
795{
796 inet6_unregister_protosw(&l2tp_ip6_protosw);
797 inet6_del_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP);
798 proto_unregister(&l2tp_ip6_prot);
799}
800
801module_init(l2tp_ip6_init);
802module_exit(l2tp_ip6_exit);
803
804MODULE_LICENSE("GPL");
805MODULE_AUTHOR("Chris Elston <celston@katalix.com>");
806MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6");
807MODULE_VERSION("1.0");
808
809/* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
810 * enums
811 */
812MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 2, IPPROTO_L2TP);
kernel source for telekom puls (alcatel/mediatek)