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-rw-r--r--include/linux/l2tp.h17
-rw-r--r--net/l2tp/Makefile3
-rw-r--r--net/l2tp/l2tp_ip6.c792
3 files changed, 812 insertions, 0 deletions
diff --git a/include/linux/l2tp.h b/include/linux/l2tp.h
index 16b834741d16..7eab668f60f3 100644
--- a/include/linux/l2tp.h
+++ b/include/linux/l2tp.h
@@ -11,6 +11,7 @@
11#include <linux/socket.h> 11#include <linux/socket.h>
12#ifdef __KERNEL__ 12#ifdef __KERNEL__
13#include <linux/in.h> 13#include <linux/in.h>
14#include <linux/in6.h>
14#else 15#else
15#include <netinet/in.h> 16#include <netinet/in.h>
16#endif 17#endif
@@ -39,6 +40,22 @@ struct sockaddr_l2tpip {
39 sizeof(__u32)]; 40 sizeof(__u32)];
40}; 41};
41 42
43/**
44 * struct sockaddr_l2tpip6 - the sockaddr structure for L2TP-over-IPv6 sockets
45 * @l2tp_family: address family number AF_L2TPIP.
46 * @l2tp_addr: protocol specific address information
47 * @l2tp_conn_id: connection id of tunnel
48 */
49struct sockaddr_l2tpip6 {
50 /* The first fields must match struct sockaddr_in6 */
51 __kernel_sa_family_t l2tp_family; /* AF_INET6 */
52 __be16 l2tp_unused; /* INET port number (unused) */
53 __be32 l2tp_flowinfo; /* IPv6 flow information */
54 struct in6_addr l2tp_addr; /* IPv6 address */
55 __u32 l2tp_scope_id; /* scope id (new in RFC2553) */
56 __u32 l2tp_conn_id; /* Connection ID of tunnel */
57};
58
42/***************************************************************************** 59/*****************************************************************************
43 * NETLINK_GENERIC netlink family. 60 * NETLINK_GENERIC netlink family.
44 *****************************************************************************/ 61 *****************************************************************************/
diff --git a/net/l2tp/Makefile b/net/l2tp/Makefile
index 110e7bc2de5e..2870f41ea44d 100644
--- a/net/l2tp/Makefile
+++ b/net/l2tp/Makefile
@@ -10,3 +10,6 @@ obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_IP)) += l2tp_ip.o
10obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_V3)) += l2tp_netlink.o 10obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_V3)) += l2tp_netlink.o
11obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_ETH)) += l2tp_eth.o 11obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_ETH)) += l2tp_eth.o
12obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_DEBUGFS)) += l2tp_debugfs.o 12obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_DEBUGFS)) += l2tp_debugfs.o
13ifneq ($(CONFIG_IPV6),)
14obj-$(subst y,$(CONFIG_L2TP),$(CONFIG_L2TP_IP)) += l2tp_ip6.o
15endif
diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
new file mode 100644
index 000000000000..88f0abe35443
--- /dev/null
+++ b/net/l2tp/l2tp_ip6.c
@@ -0,0 +1,792 @@
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
12#include <linux/icmp.h>
13#include <linux/module.h>
14#include <linux/skbuff.h>
15#include <linux/random.h>
16#include <linux/socket.h>
17#include <linux/l2tp.h>
18#include <linux/in.h>
19#include <linux/in6.h>
20#include <net/sock.h>
21#include <net/ip.h>
22#include <net/icmp.h>
23#include <net/udp.h>
24#include <net/inet_common.h>
25#include <net/inet_hashtables.h>
26#include <net/tcp_states.h>
27#include <net/protocol.h>
28#include <net/xfrm.h>
29
30#include <net/transp_v6.h>
31#include <net/addrconf.h>
32#include <net/ip6_route.h>
33
34#include "l2tp_core.h"
35
36struct l2tp_ip6_sock {
37 /* inet_sock has to be the first member of l2tp_ip6_sock */
38 struct inet_sock inet;
39
40 u32 conn_id;
41 u32 peer_conn_id;
42
43 /* ipv6_pinfo has to be the last member of l2tp_ip6_sock, see
44 inet6_sk_generic */
45 struct ipv6_pinfo inet6;
46};
47
48static DEFINE_RWLOCK(l2tp_ip6_lock);
49static struct hlist_head l2tp_ip6_table;
50static struct hlist_head l2tp_ip6_bind_table;
51
52static inline struct l2tp_ip6_sock *l2tp_ip6_sk(const struct sock *sk)
53{
54 return (struct l2tp_ip6_sock *)sk;
55}
56
57static struct sock *__l2tp_ip6_bind_lookup(struct net *net,
58 struct in6_addr *laddr,
59 int dif, u32 tunnel_id)
60{
61 struct hlist_node *node;
62 struct sock *sk;
63
64 sk_for_each_bound(sk, node, &l2tp_ip6_bind_table) {
65 struct in6_addr *addr = inet6_rcv_saddr(sk);
66 struct l2tp_ip6_sock *l2tp = l2tp_ip6_sk(sk);
67
68 if (l2tp == NULL)
69 continue;
70
71 if ((l2tp->conn_id == tunnel_id) &&
72 net_eq(sock_net(sk), net) &&
73 !(addr && ipv6_addr_equal(addr, laddr)) &&
74 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
75 goto found;
76 }
77
78 sk = NULL;
79found:
80 return sk;
81}
82
83static inline struct sock *l2tp_ip6_bind_lookup(struct net *net,
84 struct in6_addr *laddr,
85 int dif, u32 tunnel_id)
86{
87 struct sock *sk = __l2tp_ip6_bind_lookup(net, laddr, dif, tunnel_id);
88 if (sk)
89 sock_hold(sk);
90
91 return sk;
92}
93
94/* When processing receive frames, there are two cases to
95 * consider. Data frames consist of a non-zero session-id and an
96 * optional cookie. Control frames consist of a regular L2TP header
97 * preceded by 32-bits of zeros.
98 *
99 * L2TPv3 Session Header Over IP
100 *
101 * 0 1 2 3
102 * 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
103 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
104 * | Session ID |
105 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
106 * | Cookie (optional, maximum 64 bits)...
107 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
108 * |
109 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
110 *
111 * L2TPv3 Control Message Header Over IP
112 *
113 * 0 1 2 3
114 * 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
115 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
116 * | (32 bits of zeros) |
117 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
118 * |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length |
119 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
120 * | Control Connection ID |
121 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
122 * | Ns | Nr |
123 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
124 *
125 * All control frames are passed to userspace.
126 */
127static int l2tp_ip6_recv(struct sk_buff *skb)
128{
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 int length;
136 int offset;
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
171 printk(KERN_DEBUG "%s: ip recv: ", tunnel->name);
172
173 offset = 0;
174 do {
175 printk(" %02X", ptr[offset]);
176 } while (++offset < length);
177
178 printk("\n");
179 }
180
181 l2tp_recv_common(session, skb, ptr, optr, 0, skb->len,
182 tunnel->recv_payload_hook);
183 return 0;
184
185pass_up:
186 /* Get the tunnel_id from the L2TP header */
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 tunnel = l2tp_tunnel_find(&init_net, tunnel_id);
195 if (tunnel != NULL)
196 sk = tunnel->sock;
197 else {
198 struct ipv6hdr *iph = ipv6_hdr(skb);
199
200 read_lock_bh(&l2tp_ip6_lock);
201 sk = __l2tp_ip6_bind_lookup(&init_net, &iph->daddr,
202 0, tunnel_id);
203 read_unlock_bh(&l2tp_ip6_lock);
204 }
205
206 if (sk == NULL)
207 goto discard;
208
209 sock_hold(sk);
210
211 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
212 goto discard_put;
213
214 nf_reset(skb);
215
216 return sk_receive_skb(sk, skb, 1);
217
218discard_put:
219 sock_put(sk);
220
221discard:
222 kfree_skb(skb);
223 return 0;
224}
225
226static int l2tp_ip6_open(struct sock *sk)
227{
228 /* Prevent autobind. We don't have ports. */
229 inet_sk(sk)->inet_num = IPPROTO_L2TP;
230
231 write_lock_bh(&l2tp_ip6_lock);
232 sk_add_node(sk, &l2tp_ip6_table);
233 write_unlock_bh(&l2tp_ip6_lock);
234
235 return 0;
236}
237
238static void l2tp_ip6_close(struct sock *sk, long timeout)
239{
240 write_lock_bh(&l2tp_ip6_lock);
241 hlist_del_init(&sk->sk_bind_node);
242 sk_del_node_init(sk);
243 write_unlock_bh(&l2tp_ip6_lock);
244
245 sk_common_release(sk);
246}
247
248static void l2tp_ip6_destroy_sock(struct sock *sk)
249{
250 lock_sock(sk);
251 ip6_flush_pending_frames(sk);
252 release_sock(sk);
253
254 inet6_destroy_sock(sk);
255}
256
257static int l2tp_ip6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
258{
259 struct inet_sock *inet = inet_sk(sk);
260 struct ipv6_pinfo *np = inet6_sk(sk);
261 struct sockaddr_l2tpip6 *addr = (struct sockaddr_l2tpip6 *) uaddr;
262 __be32 v4addr = 0;
263 int addr_type;
264 int err;
265
266 if (addr_len < sizeof(*addr))
267 return -EINVAL;
268
269 addr_type = ipv6_addr_type(&addr->l2tp_addr);
270
271 /* l2tp_ip6 sockets are IPv6 only */
272 if (addr_type == IPV6_ADDR_MAPPED)
273 return -EADDRNOTAVAIL;
274
275 /* L2TP is point-point, not multicast */
276 if (addr_type & IPV6_ADDR_MULTICAST)
277 return -EADDRNOTAVAIL;
278
279 err = -EADDRINUSE;
280 read_lock_bh(&l2tp_ip6_lock);
281 if (__l2tp_ip6_bind_lookup(&init_net, &addr->l2tp_addr,
282 sk->sk_bound_dev_if, addr->l2tp_conn_id))
283 goto out_in_use;
284 read_unlock_bh(&l2tp_ip6_lock);
285
286 lock_sock(sk);
287
288 err = -EINVAL;
289 if (sk->sk_state != TCP_CLOSE)
290 goto out_unlock;
291
292 /* Check if the address belongs to the host. */
293 rcu_read_lock();
294 if (addr_type != IPV6_ADDR_ANY) {
295 struct net_device *dev = NULL;
296
297 if (addr_type & IPV6_ADDR_LINKLOCAL) {
298 if (addr_len >= sizeof(struct sockaddr_in6) &&
299 addr->l2tp_scope_id) {
300 /* Override any existing binding, if another
301 * one is supplied by user.
302 */
303 sk->sk_bound_dev_if = addr->l2tp_scope_id;
304 }
305
306 /* Binding to link-local address requires an
307 interface */
308 if (!sk->sk_bound_dev_if)
309 goto out_unlock_rcu;
310
311 err = -ENODEV;
312 dev = dev_get_by_index_rcu(sock_net(sk),
313 sk->sk_bound_dev_if);
314 if (!dev)
315 goto out_unlock_rcu;
316 }
317
318 /* ipv4 addr of the socket is invalid. Only the
319 * unspecified and mapped address have a v4 equivalent.
320 */
321 v4addr = LOOPBACK4_IPV6;
322 err = -EADDRNOTAVAIL;
323 if (!ipv6_chk_addr(sock_net(sk), &addr->l2tp_addr, dev, 0))
324 goto out_unlock_rcu;
325 }
326 rcu_read_unlock();
327
328 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
329 np->rcv_saddr = addr->l2tp_addr;
330 np->saddr = addr->l2tp_addr;
331
332 l2tp_ip6_sk(sk)->conn_id = addr->l2tp_conn_id;
333
334 write_lock_bh(&l2tp_ip6_lock);
335 sk_add_bind_node(sk, &l2tp_ip6_bind_table);
336 sk_del_node_init(sk);
337 write_unlock_bh(&l2tp_ip6_lock);
338
339 release_sock(sk);
340 return 0;
341
342out_unlock_rcu:
343 rcu_read_unlock();
344out_unlock:
345 release_sock(sk);
346 return err;
347
348out_in_use:
349 read_unlock_bh(&l2tp_ip6_lock);
350 return err;
351}
352
353static int l2tp_ip6_connect(struct sock *sk, struct sockaddr *uaddr,
354 int addr_len)
355{
356 struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *) uaddr;
357 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
358 struct in6_addr *daddr;
359 int addr_type;
360 int rc;
361
362 if (addr_len < sizeof(*lsa))
363 return -EINVAL;
364
365 addr_type = ipv6_addr_type(&usin->sin6_addr);
366 if (addr_type & IPV6_ADDR_MULTICAST)
367 return -EINVAL;
368
369 if (addr_type & IPV6_ADDR_MAPPED) {
370 daddr = &usin->sin6_addr;
371 if (ipv4_is_multicast(daddr->s6_addr32[3]))
372 return -EINVAL;
373 }
374
375 rc = ip6_datagram_connect(sk, uaddr, addr_len);
376
377 lock_sock(sk);
378
379 l2tp_ip6_sk(sk)->peer_conn_id = lsa->l2tp_conn_id;
380
381 write_lock_bh(&l2tp_ip6_lock);
382 hlist_del_init(&sk->sk_bind_node);
383 sk_add_bind_node(sk, &l2tp_ip6_bind_table);
384 write_unlock_bh(&l2tp_ip6_lock);
385
386 release_sock(sk);
387
388 return rc;
389}
390
391static int l2tp_ip6_getname(struct socket *sock, struct sockaddr *uaddr,
392 int *uaddr_len, int peer)
393{
394 struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *)uaddr;
395 struct sock *sk = sock->sk;
396 struct ipv6_pinfo *np = inet6_sk(sk);
397 struct l2tp_ip6_sock *lsk = l2tp_ip6_sk(sk);
398
399 lsa->l2tp_family = AF_INET6;
400 lsa->l2tp_flowinfo = 0;
401 lsa->l2tp_scope_id = 0;
402 if (peer) {
403 if (!lsk->peer_conn_id)
404 return -ENOTCONN;
405 lsa->l2tp_conn_id = lsk->peer_conn_id;
406 lsa->l2tp_addr = np->daddr;
407 if (np->sndflow)
408 lsa->l2tp_flowinfo = np->flow_label;
409 } else {
410 if (ipv6_addr_any(&np->rcv_saddr))
411 lsa->l2tp_addr = np->saddr;
412 else
413 lsa->l2tp_addr = np->rcv_saddr;
414
415 lsa->l2tp_conn_id = lsk->conn_id;
416 }
417 if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL)
418 lsa->l2tp_scope_id = sk->sk_bound_dev_if;
419 *uaddr_len = sizeof(*lsa);
420 return 0;
421}
422
423static int l2tp_ip6_backlog_recv(struct sock *sk, struct sk_buff *skb)
424{
425 int rc;
426
427 /* Charge it to the socket, dropping if the queue is full. */
428 rc = sock_queue_rcv_skb(sk, skb);
429 if (rc < 0)
430 goto drop;
431
432 return 0;
433
434drop:
435 IP_INC_STATS(&init_net, IPSTATS_MIB_INDISCARDS);
436 kfree_skb(skb);
437 return -1;
438}
439
440static int l2tp_ip6_push_pending_frames(struct sock *sk)
441{
442 struct sk_buff *skb;
443 __be32 *transhdr = NULL;
444 int err = 0;
445
446 skb = skb_peek(&sk->sk_write_queue);
447 if (skb == NULL)
448 goto out;
449
450 transhdr = (__be32 *)skb_transport_header(skb);
451 *transhdr = 0;
452
453 err = ip6_push_pending_frames(sk);
454
455out:
456 return err;
457}
458
459/* Userspace will call sendmsg() on the tunnel socket to send L2TP
460 * control frames.
461 */
462static int l2tp_ip6_sendmsg(struct kiocb *iocb, struct sock *sk,
463 struct msghdr *msg, size_t len)
464{
465 struct ipv6_txoptions opt_space;
466 struct sockaddr_l2tpip6 *lsa =
467 (struct sockaddr_l2tpip6 *) msg->msg_name;
468 struct in6_addr *daddr, *final_p, final;
469 struct ipv6_pinfo *np = inet6_sk(sk);
470 struct ipv6_txoptions *opt = NULL;
471 struct ip6_flowlabel *flowlabel = NULL;
472 struct dst_entry *dst = NULL;
473 struct flowi6 fl6;
474 int addr_len = msg->msg_namelen;
475 int hlimit = -1;
476 int tclass = -1;
477 int dontfrag = -1;
478 int transhdrlen = 4; /* zero session-id */
479 int ulen = len + transhdrlen;
480 int err;
481
482 /* Rough check on arithmetic overflow,
483 better check is made in ip6_append_data().
484 */
485 if (len > INT_MAX)
486 return -EMSGSIZE;
487
488 /* Mirror BSD error message compatibility */
489 if (msg->msg_flags & MSG_OOB)
490 return -EOPNOTSUPP;
491
492 /*
493 * Get and verify the address.
494 */
495 memset(&fl6, 0, sizeof(fl6));
496
497 fl6.flowi6_mark = sk->sk_mark;
498
499 if (lsa) {
500 if (addr_len < SIN6_LEN_RFC2133)
501 return -EINVAL;
502
503 if (lsa->l2tp_family && lsa->l2tp_family != AF_INET6)
504 return -EAFNOSUPPORT;
505
506 daddr = &lsa->l2tp_addr;
507 if (np->sndflow) {
508 fl6.flowlabel = lsa->l2tp_flowinfo & IPV6_FLOWINFO_MASK;
509 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
510 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
511 if (flowlabel == NULL)
512 return -EINVAL;
513 daddr = &flowlabel->dst;
514 }
515 }
516
517 /*
518 * Otherwise it will be difficult to maintain
519 * sk->sk_dst_cache.
520 */
521 if (sk->sk_state == TCP_ESTABLISHED &&
522 ipv6_addr_equal(daddr, &np->daddr))
523 daddr = &np->daddr;
524
525 if (addr_len >= sizeof(struct sockaddr_in6) &&
526 lsa->l2tp_scope_id &&
527 ipv6_addr_type(daddr) & IPV6_ADDR_LINKLOCAL)
528 fl6.flowi6_oif = lsa->l2tp_scope_id;
529 } else {
530 if (sk->sk_state != TCP_ESTABLISHED)
531 return -EDESTADDRREQ;
532
533 daddr = &np->daddr;
534 fl6.flowlabel = np->flow_label;
535 }
536
537 if (fl6.flowi6_oif == 0)
538 fl6.flowi6_oif = sk->sk_bound_dev_if;
539
540 if (msg->msg_controllen) {
541 opt = &opt_space;
542 memset(opt, 0, sizeof(struct ipv6_txoptions));
543 opt->tot_len = sizeof(struct ipv6_txoptions);
544
545 err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
546 &hlimit, &tclass, &dontfrag);
547 if (err < 0) {
548 fl6_sock_release(flowlabel);
549 return err;
550 }
551 if ((fl6.flowlabel & IPV6_FLOWLABEL_MASK) && !flowlabel) {
552 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
553 if (flowlabel == NULL)
554 return -EINVAL;
555 }
556 if (!(opt->opt_nflen|opt->opt_flen))
557 opt = NULL;
558 }
559
560 if (opt == NULL)
561 opt = np->opt;
562 if (flowlabel)
563 opt = fl6_merge_options(&opt_space, flowlabel, opt);
564 opt = ipv6_fixup_options(&opt_space, opt);
565
566 fl6.flowi6_proto = sk->sk_protocol;
567 if (!ipv6_addr_any(daddr))
568 fl6.daddr = *daddr;
569 else
570 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
571 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
572 fl6.saddr = np->saddr;
573
574 final_p = fl6_update_dst(&fl6, opt, &final);
575
576 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
577 fl6.flowi6_oif = np->mcast_oif;
578 else if (!fl6.flowi6_oif)
579 fl6.flowi6_oif = np->ucast_oif;
580
581 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
582
583 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
584 if (IS_ERR(dst)) {
585 err = PTR_ERR(dst);
586 goto out;
587 }
588
589 if (hlimit < 0) {
590 if (ipv6_addr_is_multicast(&fl6.daddr))
591 hlimit = np->mcast_hops;
592 else
593 hlimit = np->hop_limit;
594 if (hlimit < 0)
595 hlimit = ip6_dst_hoplimit(dst);
596 }
597
598 if (tclass < 0)
599 tclass = np->tclass;
600
601 if (dontfrag < 0)
602 dontfrag = np->dontfrag;
603
604 if (msg->msg_flags & MSG_CONFIRM)
605 goto do_confirm;
606
607back_from_confirm:
608 lock_sock(sk);
609 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
610 ulen, transhdrlen, hlimit, tclass, opt,
611 &fl6, (struct rt6_info *)dst,
612 msg->msg_flags, dontfrag);
613 if (err)
614 ip6_flush_pending_frames(sk);
615 else if (!(msg->msg_flags & MSG_MORE))
616 err = l2tp_ip6_push_pending_frames(sk);
617 release_sock(sk);
618done:
619 dst_release(dst);
620out:
621 fl6_sock_release(flowlabel);
622
623 return err < 0 ? err : len;
624
625do_confirm:
626 dst_confirm(dst);
627 if (!(msg->msg_flags & MSG_PROBE) || len)
628 goto back_from_confirm;
629 err = 0;
630 goto done;
631}
632
633static int l2tp_ip6_recvmsg(struct kiocb *iocb, struct sock *sk,
634 struct msghdr *msg, size_t len, int noblock,
635 int flags, int *addr_len)
636{
637 struct inet_sock *inet = inet_sk(sk);
638 struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *)msg->msg_name;
639 size_t copied = 0;
640 int err = -EOPNOTSUPP;
641 struct sk_buff *skb;
642
643 if (flags & MSG_OOB)
644 goto out;
645
646 if (addr_len)
647 *addr_len = sizeof(*lsa);
648
649 if (flags & MSG_ERRQUEUE)
650 return ipv6_recv_error(sk, msg, len);
651
652 skb = skb_recv_datagram(sk, flags, noblock, &err);
653 if (!skb)
654 goto out;
655
656 copied = skb->len;
657 if (len < copied) {
658 msg->msg_flags |= MSG_TRUNC;
659 copied = len;
660 }
661
662 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
663 if (err)
664 goto done;
665
666 sock_recv_timestamp(msg, sk, skb);
667
668 /* Copy the address. */
669 if (lsa) {
670 lsa->l2tp_family = AF_INET6;
671 lsa->l2tp_unused = 0;
672 lsa->l2tp_addr = ipv6_hdr(skb)->saddr;
673 lsa->l2tp_flowinfo = 0;
674 lsa->l2tp_scope_id = 0;
675 if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL)
676 lsa->l2tp_scope_id = IP6CB(skb)->iif;
677 }
678
679 if (inet->cmsg_flags)
680 ip_cmsg_recv(msg, skb);
681
682 if (flags & MSG_TRUNC)
683 copied = skb->len;
684done:
685 skb_free_datagram(sk, skb);
686out:
687 return err ? err : copied;
688}
689
690static struct proto l2tp_ip6_prot = {
691 .name = "L2TP/IPv6",
692 .owner = THIS_MODULE,
693 .init = l2tp_ip6_open,
694 .close = l2tp_ip6_close,
695 .bind = l2tp_ip6_bind,
696 .connect = l2tp_ip6_connect,
697 .disconnect = udp_disconnect,
698 .ioctl = udp_ioctl,
699 .destroy = l2tp_ip6_destroy_sock,
700 .setsockopt = ipv6_setsockopt,
701 .getsockopt = ipv6_getsockopt,
702 .sendmsg = l2tp_ip6_sendmsg,
703 .recvmsg = l2tp_ip6_recvmsg,
704 .backlog_rcv = l2tp_ip6_backlog_recv,
705 .hash = inet_hash,
706 .unhash = inet_unhash,
707 .obj_size = sizeof(struct l2tp_ip6_sock),
708#ifdef CONFIG_COMPAT
709 .compat_setsockopt = compat_ipv6_setsockopt,
710 .compat_getsockopt = compat_ipv6_getsockopt,
711#endif
712};
713
714static const struct proto_ops l2tp_ip6_ops = {
715 .family = PF_INET6,
716 .owner = THIS_MODULE,
717 .release = inet6_release,
718 .bind = inet6_bind,
719 .connect = inet_dgram_connect,
720 .socketpair = sock_no_socketpair,
721 .accept = sock_no_accept,
722 .getname = l2tp_ip6_getname,
723 .poll = datagram_poll,
724 .ioctl = inet6_ioctl,
725 .listen = sock_no_listen,
726 .shutdown = inet_shutdown,
727 .setsockopt = sock_common_setsockopt,
728 .getsockopt = sock_common_getsockopt,
729 .sendmsg = inet_sendmsg,
730 .recvmsg = sock_common_recvmsg,
731 .mmap = sock_no_mmap,
732 .sendpage = sock_no_sendpage,
733#ifdef CONFIG_COMPAT
734 .compat_setsockopt = compat_sock_common_setsockopt,
735 .compat_getsockopt = compat_sock_common_getsockopt,
736#endif
737};
738
739static struct inet_protosw l2tp_ip6_protosw = {
740 .type = SOCK_DGRAM,
741 .protocol = IPPROTO_L2TP,
742 .prot = &l2tp_ip6_prot,
743 .ops = &l2tp_ip6_ops,
744 .no_check = 0,
745};
746
747static struct inet6_protocol l2tp_ip6_protocol __read_mostly = {
748 .handler = l2tp_ip6_recv,
749};
750
751static int __init l2tp_ip6_init(void)
752{
753 int err;
754
755 printk(KERN_INFO "L2TP IP encapsulation support for IPv6 (L2TPv3)\n");
756
757 err = proto_register(&l2tp_ip6_prot, 1);
758 if (err != 0)
759 goto out;
760
761 err = inet6_add_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP);
762 if (err)
763 goto out1;
764
765 inet6_register_protosw(&l2tp_ip6_protosw);
766 return 0;
767
768out1:
769 proto_unregister(&l2tp_ip6_prot);
770out:
771 return err;
772}
773
774static void __exit l2tp_ip6_exit(void)
775{
776 inet6_unregister_protosw(&l2tp_ip6_protosw);
777 inet6_del_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP);
778 proto_unregister(&l2tp_ip6_prot);
779}
780
781module_init(l2tp_ip6_init);
782module_exit(l2tp_ip6_exit);
783
784MODULE_LICENSE("GPL");
785MODULE_AUTHOR("Chris Elston <celston@katalix.com>");
786MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6");
787MODULE_VERSION("1.0");
788
789/* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like
790 * enums
791 */
792MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 2, IPPROTO_L2TP);
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-29 23:23:16 -0400