Commit | Line | Data |
---|---|---|
fd558d18 JC |
1 | /* |
2 | * L2TP core. | |
3 | * | |
4 | * Copyright (c) 2008,2009,2010 Katalix Systems Ltd | |
5 | * | |
6 | * This file contains some code of the original L2TPv2 pppol2tp | |
7 | * driver, which has the following copyright: | |
8 | * | |
9 | * Authors: Martijn van Oosterhout <kleptog@svana.org> | |
10 | * James Chapman (jchapman@katalix.com) | |
11 | * Contributors: | |
12 | * Michal Ostrowski <mostrows@speakeasy.net> | |
13 | * Arnaldo Carvalho de Melo <acme@xconectiva.com.br> | |
14 | * David S. Miller (davem@redhat.com) | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2 as | |
18 | * published by the Free Software Foundation. | |
19 | */ | |
20 | ||
a4ca44fa JP |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
fd558d18 JC |
23 | #include <linux/module.h> |
24 | #include <linux/string.h> | |
25 | #include <linux/list.h> | |
e02d494d | 26 | #include <linux/rculist.h> |
fd558d18 JC |
27 | #include <linux/uaccess.h> |
28 | ||
29 | #include <linux/kernel.h> | |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/kthread.h> | |
32 | #include <linux/sched.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/errno.h> | |
35 | #include <linux/jiffies.h> | |
36 | ||
37 | #include <linux/netdevice.h> | |
38 | #include <linux/net.h> | |
39 | #include <linux/inetdevice.h> | |
40 | #include <linux/skbuff.h> | |
41 | #include <linux/init.h> | |
0d76751f | 42 | #include <linux/in.h> |
fd558d18 JC |
43 | #include <linux/ip.h> |
44 | #include <linux/udp.h> | |
0d76751f | 45 | #include <linux/l2tp.h> |
fd558d18 JC |
46 | #include <linux/hash.h> |
47 | #include <linux/sort.h> | |
48 | #include <linux/file.h> | |
49 | #include <linux/nsproxy.h> | |
50 | #include <net/net_namespace.h> | |
51 | #include <net/netns/generic.h> | |
52 | #include <net/dst.h> | |
53 | #include <net/ip.h> | |
54 | #include <net/udp.h> | |
85644b4d | 55 | #include <net/udp_tunnel.h> |
309795f4 | 56 | #include <net/inet_common.h> |
fd558d18 | 57 | #include <net/xfrm.h> |
0d76751f | 58 | #include <net/protocol.h> |
d2cf3361 BL |
59 | #include <net/inet6_connection_sock.h> |
60 | #include <net/inet_ecn.h> | |
61 | #include <net/ip6_route.h> | |
d499bd2e | 62 | #include <net/ip6_checksum.h> |
fd558d18 JC |
63 | |
64 | #include <asm/byteorder.h> | |
60063497 | 65 | #include <linux/atomic.h> |
fd558d18 JC |
66 | |
67 | #include "l2tp_core.h" | |
68 | ||
69 | #define L2TP_DRV_VERSION "V2.0" | |
70 | ||
71 | /* L2TP header constants */ | |
72 | #define L2TP_HDRFLAG_T 0x8000 | |
73 | #define L2TP_HDRFLAG_L 0x4000 | |
74 | #define L2TP_HDRFLAG_S 0x0800 | |
75 | #define L2TP_HDRFLAG_O 0x0200 | |
76 | #define L2TP_HDRFLAG_P 0x0100 | |
77 | ||
78 | #define L2TP_HDR_VER_MASK 0x000F | |
79 | #define L2TP_HDR_VER_2 0x0002 | |
f7faffa3 | 80 | #define L2TP_HDR_VER_3 0x0003 |
fd558d18 JC |
81 | |
82 | /* L2TPv3 default L2-specific sublayer */ | |
83 | #define L2TP_SLFLAG_S 0x40000000 | |
84 | #define L2TP_SL_SEQ_MASK 0x00ffffff | |
85 | ||
86 | #define L2TP_HDR_SIZE_SEQ 10 | |
87 | #define L2TP_HDR_SIZE_NOSEQ 6 | |
88 | ||
89 | /* Default trace flags */ | |
90 | #define L2TP_DEFAULT_DEBUG_FLAGS 0 | |
91 | ||
fd558d18 JC |
92 | /* Private data stored for received packets in the skb. |
93 | */ | |
94 | struct l2tp_skb_cb { | |
f7faffa3 | 95 | u32 ns; |
fd558d18 JC |
96 | u16 has_seq; |
97 | u16 length; | |
98 | unsigned long expires; | |
99 | }; | |
100 | ||
101 | #define L2TP_SKB_CB(skb) ((struct l2tp_skb_cb *) &skb->cb[sizeof(struct inet_skb_parm)]) | |
102 | ||
103 | static atomic_t l2tp_tunnel_count; | |
104 | static atomic_t l2tp_session_count; | |
f8ccac0e | 105 | static struct workqueue_struct *l2tp_wq; |
fd558d18 JC |
106 | |
107 | /* per-net private data for this module */ | |
108 | static unsigned int l2tp_net_id; | |
109 | struct l2tp_net { | |
110 | struct list_head l2tp_tunnel_list; | |
e02d494d | 111 | spinlock_t l2tp_tunnel_list_lock; |
f7faffa3 | 112 | struct hlist_head l2tp_session_hlist[L2TP_HASH_SIZE_2]; |
e02d494d | 113 | spinlock_t l2tp_session_hlist_lock; |
fd558d18 JC |
114 | }; |
115 | ||
fc130840 | 116 | |
8d8a51e2 DM |
117 | static inline struct l2tp_tunnel *l2tp_tunnel(struct sock *sk) |
118 | { | |
119 | return sk->sk_user_data; | |
120 | } | |
121 | ||
9aaef50c | 122 | static inline struct l2tp_net *l2tp_pernet(const struct net *net) |
fd558d18 JC |
123 | { |
124 | BUG_ON(!net); | |
125 | ||
126 | return net_generic(net, l2tp_net_id); | |
127 | } | |
128 | ||
f7faffa3 JC |
129 | /* Session hash global list for L2TPv3. |
130 | * The session_id SHOULD be random according to RFC3931, but several | |
131 | * L2TP implementations use incrementing session_ids. So we do a real | |
132 | * hash on the session_id, rather than a simple bitmask. | |
133 | */ | |
134 | static inline struct hlist_head * | |
135 | l2tp_session_id_hash_2(struct l2tp_net *pn, u32 session_id) | |
136 | { | |
137 | return &pn->l2tp_session_hlist[hash_32(session_id, L2TP_HASH_BITS_2)]; | |
138 | ||
139 | } | |
140 | ||
80d84ef3 TP |
141 | /* Lookup the tunnel socket, possibly involving the fs code if the socket is |
142 | * owned by userspace. A struct sock returned from this function must be | |
143 | * released using l2tp_tunnel_sock_put once you're done with it. | |
144 | */ | |
b5d2b285 | 145 | static struct sock *l2tp_tunnel_sock_lookup(struct l2tp_tunnel *tunnel) |
80d84ef3 TP |
146 | { |
147 | int err = 0; | |
148 | struct socket *sock = NULL; | |
149 | struct sock *sk = NULL; | |
150 | ||
151 | if (!tunnel) | |
152 | goto out; | |
153 | ||
154 | if (tunnel->fd >= 0) { | |
155 | /* Socket is owned by userspace, who might be in the process | |
156 | * of closing it. Look the socket up using the fd to ensure | |
157 | * consistency. | |
158 | */ | |
159 | sock = sockfd_lookup(tunnel->fd, &err); | |
160 | if (sock) | |
161 | sk = sock->sk; | |
162 | } else { | |
163 | /* Socket is owned by kernelspace */ | |
164 | sk = tunnel->sock; | |
8abbbe8f | 165 | sock_hold(sk); |
80d84ef3 TP |
166 | } |
167 | ||
168 | out: | |
169 | return sk; | |
170 | } | |
80d84ef3 TP |
171 | |
172 | /* Drop a reference to a tunnel socket obtained via. l2tp_tunnel_sock_put */ | |
b5d2b285 | 173 | static void l2tp_tunnel_sock_put(struct sock *sk) |
80d84ef3 TP |
174 | { |
175 | struct l2tp_tunnel *tunnel = l2tp_sock_to_tunnel(sk); | |
176 | if (tunnel) { | |
177 | if (tunnel->fd >= 0) { | |
178 | /* Socket is owned by userspace */ | |
179 | sockfd_put(sk->sk_socket); | |
180 | } | |
181 | sock_put(sk); | |
182 | } | |
8abbbe8f | 183 | sock_put(sk); |
80d84ef3 | 184 | } |
80d84ef3 | 185 | |
fd558d18 JC |
186 | /* Session hash list. |
187 | * The session_id SHOULD be random according to RFC2661, but several | |
188 | * L2TP implementations (Cisco and Microsoft) use incrementing | |
189 | * session_ids. So we do a real hash on the session_id, rather than a | |
190 | * simple bitmask. | |
191 | */ | |
192 | static inline struct hlist_head * | |
193 | l2tp_session_id_hash(struct l2tp_tunnel *tunnel, u32 session_id) | |
194 | { | |
195 | return &tunnel->session_hlist[hash_32(session_id, L2TP_HASH_BITS)]; | |
196 | } | |
197 | ||
54652eb1 GN |
198 | /* Lookup a tunnel. A new reference is held on the returned tunnel. */ |
199 | struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id) | |
200 | { | |
201 | const struct l2tp_net *pn = l2tp_pernet(net); | |
202 | struct l2tp_tunnel *tunnel; | |
203 | ||
204 | rcu_read_lock_bh(); | |
205 | list_for_each_entry_rcu(tunnel, &pn->l2tp_tunnel_list, list) { | |
206 | if (tunnel->tunnel_id == tunnel_id) { | |
207 | l2tp_tunnel_inc_refcount(tunnel); | |
208 | rcu_read_unlock_bh(); | |
209 | ||
210 | return tunnel; | |
211 | } | |
212 | } | |
213 | rcu_read_unlock_bh(); | |
214 | ||
215 | return NULL; | |
216 | } | |
217 | EXPORT_SYMBOL_GPL(l2tp_tunnel_get); | |
218 | ||
55a3ce3b | 219 | /* Lookup a session. A new reference is held on the returned session. |
61b9a047 GN |
220 | * Optionally calls session->ref() too if do_ref is true. |
221 | */ | |
9aaef50c | 222 | struct l2tp_session *l2tp_session_get(const struct net *net, |
61b9a047 GN |
223 | struct l2tp_tunnel *tunnel, |
224 | u32 session_id, bool do_ref) | |
225 | { | |
226 | struct hlist_head *session_list; | |
227 | struct l2tp_session *session; | |
228 | ||
229 | if (!tunnel) { | |
230 | struct l2tp_net *pn = l2tp_pernet(net); | |
231 | ||
232 | session_list = l2tp_session_id_hash_2(pn, session_id); | |
233 | ||
234 | rcu_read_lock_bh(); | |
235 | hlist_for_each_entry_rcu(session, session_list, global_hlist) { | |
236 | if (session->session_id == session_id) { | |
237 | l2tp_session_inc_refcount(session); | |
238 | if (do_ref && session->ref) | |
239 | session->ref(session); | |
240 | rcu_read_unlock_bh(); | |
241 | ||
242 | return session; | |
243 | } | |
244 | } | |
245 | rcu_read_unlock_bh(); | |
246 | ||
247 | return NULL; | |
248 | } | |
249 | ||
250 | session_list = l2tp_session_id_hash(tunnel, session_id); | |
251 | read_lock_bh(&tunnel->hlist_lock); | |
252 | hlist_for_each_entry(session, session_list, hlist) { | |
253 | if (session->session_id == session_id) { | |
254 | l2tp_session_inc_refcount(session); | |
255 | if (do_ref && session->ref) | |
256 | session->ref(session); | |
257 | read_unlock_bh(&tunnel->hlist_lock); | |
258 | ||
259 | return session; | |
260 | } | |
261 | } | |
262 | read_unlock_bh(&tunnel->hlist_lock); | |
263 | ||
264 | return NULL; | |
265 | } | |
266 | EXPORT_SYMBOL_GPL(l2tp_session_get); | |
267 | ||
e08293a4 GN |
268 | struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth, |
269 | bool do_ref) | |
fd558d18 JC |
270 | { |
271 | int hash; | |
fd558d18 JC |
272 | struct l2tp_session *session; |
273 | int count = 0; | |
274 | ||
275 | read_lock_bh(&tunnel->hlist_lock); | |
276 | for (hash = 0; hash < L2TP_HASH_SIZE; hash++) { | |
b67bfe0d | 277 | hlist_for_each_entry(session, &tunnel->session_hlist[hash], hlist) { |
fd558d18 | 278 | if (++count > nth) { |
e08293a4 GN |
279 | l2tp_session_inc_refcount(session); |
280 | if (do_ref && session->ref) | |
281 | session->ref(session); | |
fd558d18 JC |
282 | read_unlock_bh(&tunnel->hlist_lock); |
283 | return session; | |
284 | } | |
285 | } | |
286 | } | |
287 | ||
288 | read_unlock_bh(&tunnel->hlist_lock); | |
289 | ||
290 | return NULL; | |
291 | } | |
e08293a4 | 292 | EXPORT_SYMBOL_GPL(l2tp_session_get_nth); |
fd558d18 | 293 | |
309795f4 JC |
294 | /* Lookup a session by interface name. |
295 | * This is very inefficient but is only used by management interfaces. | |
296 | */ | |
9aaef50c GN |
297 | struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net, |
298 | const char *ifname, | |
2777e2ab | 299 | bool do_ref) |
309795f4 JC |
300 | { |
301 | struct l2tp_net *pn = l2tp_pernet(net); | |
302 | int hash; | |
309795f4 JC |
303 | struct l2tp_session *session; |
304 | ||
e02d494d | 305 | rcu_read_lock_bh(); |
309795f4 | 306 | for (hash = 0; hash < L2TP_HASH_SIZE_2; hash++) { |
b67bfe0d | 307 | hlist_for_each_entry_rcu(session, &pn->l2tp_session_hlist[hash], global_hlist) { |
309795f4 | 308 | if (!strcmp(session->ifname, ifname)) { |
2777e2ab GN |
309 | l2tp_session_inc_refcount(session); |
310 | if (do_ref && session->ref) | |
311 | session->ref(session); | |
e02d494d | 312 | rcu_read_unlock_bh(); |
2777e2ab | 313 | |
309795f4 JC |
314 | return session; |
315 | } | |
316 | } | |
317 | } | |
318 | ||
e02d494d | 319 | rcu_read_unlock_bh(); |
309795f4 JC |
320 | |
321 | return NULL; | |
322 | } | |
2777e2ab | 323 | EXPORT_SYMBOL_GPL(l2tp_session_get_by_ifname); |
309795f4 | 324 | |
3953ae7b GN |
325 | int l2tp_session_register(struct l2tp_session *session, |
326 | struct l2tp_tunnel *tunnel) | |
dbdbc73b GN |
327 | { |
328 | struct l2tp_session *session_walk; | |
329 | struct hlist_head *g_head; | |
330 | struct hlist_head *head; | |
331 | struct l2tp_net *pn; | |
f3c66d4e | 332 | int err; |
dbdbc73b GN |
333 | |
334 | head = l2tp_session_id_hash(tunnel, session->session_id); | |
335 | ||
336 | write_lock_bh(&tunnel->hlist_lock); | |
f3c66d4e GN |
337 | if (!tunnel->acpt_newsess) { |
338 | err = -ENODEV; | |
339 | goto err_tlock; | |
340 | } | |
341 | ||
dbdbc73b | 342 | hlist_for_each_entry(session_walk, head, hlist) |
f3c66d4e GN |
343 | if (session_walk->session_id == session->session_id) { |
344 | err = -EEXIST; | |
345 | goto err_tlock; | |
346 | } | |
dbdbc73b GN |
347 | |
348 | if (tunnel->version == L2TP_HDR_VER_3) { | |
349 | pn = l2tp_pernet(tunnel->l2tp_net); | |
350 | g_head = l2tp_session_id_hash_2(l2tp_pernet(tunnel->l2tp_net), | |
351 | session->session_id); | |
352 | ||
353 | spin_lock_bh(&pn->l2tp_session_hlist_lock); | |
f3c66d4e | 354 | |
dbdbc73b | 355 | hlist_for_each_entry(session_walk, g_head, global_hlist) |
f3c66d4e GN |
356 | if (session_walk->session_id == session->session_id) { |
357 | err = -EEXIST; | |
358 | goto err_tlock_pnlock; | |
359 | } | |
dbdbc73b | 360 | |
f3c66d4e GN |
361 | l2tp_tunnel_inc_refcount(tunnel); |
362 | sock_hold(tunnel->sock); | |
dbdbc73b | 363 | hlist_add_head_rcu(&session->global_hlist, g_head); |
f3c66d4e | 364 | |
dbdbc73b | 365 | spin_unlock_bh(&pn->l2tp_session_hlist_lock); |
f3c66d4e GN |
366 | } else { |
367 | l2tp_tunnel_inc_refcount(tunnel); | |
368 | sock_hold(tunnel->sock); | |
dbdbc73b GN |
369 | } |
370 | ||
371 | hlist_add_head(&session->hlist, head); | |
372 | write_unlock_bh(&tunnel->hlist_lock); | |
373 | ||
3953ae7b GN |
374 | /* Ignore management session in session count value */ |
375 | if (session->session_id != 0) | |
376 | atomic_inc(&l2tp_session_count); | |
377 | ||
dbdbc73b GN |
378 | return 0; |
379 | ||
f3c66d4e | 380 | err_tlock_pnlock: |
dbdbc73b | 381 | spin_unlock_bh(&pn->l2tp_session_hlist_lock); |
f3c66d4e | 382 | err_tlock: |
dbdbc73b GN |
383 | write_unlock_bh(&tunnel->hlist_lock); |
384 | ||
f3c66d4e | 385 | return err; |
dbdbc73b | 386 | } |
3953ae7b | 387 | EXPORT_SYMBOL_GPL(l2tp_session_register); |
dbdbc73b | 388 | |
fd558d18 JC |
389 | /* Lookup a tunnel by id |
390 | */ | |
2f858b92 | 391 | struct l2tp_tunnel *l2tp_tunnel_find(const struct net *net, u32 tunnel_id) |
fd558d18 JC |
392 | { |
393 | struct l2tp_tunnel *tunnel; | |
394 | struct l2tp_net *pn = l2tp_pernet(net); | |
395 | ||
e02d494d JC |
396 | rcu_read_lock_bh(); |
397 | list_for_each_entry_rcu(tunnel, &pn->l2tp_tunnel_list, list) { | |
fd558d18 | 398 | if (tunnel->tunnel_id == tunnel_id) { |
e02d494d | 399 | rcu_read_unlock_bh(); |
fd558d18 JC |
400 | return tunnel; |
401 | } | |
402 | } | |
e02d494d | 403 | rcu_read_unlock_bh(); |
fd558d18 JC |
404 | |
405 | return NULL; | |
406 | } | |
407 | EXPORT_SYMBOL_GPL(l2tp_tunnel_find); | |
408 | ||
2f858b92 | 409 | struct l2tp_tunnel *l2tp_tunnel_find_nth(const struct net *net, int nth) |
fd558d18 JC |
410 | { |
411 | struct l2tp_net *pn = l2tp_pernet(net); | |
412 | struct l2tp_tunnel *tunnel; | |
413 | int count = 0; | |
414 | ||
e02d494d JC |
415 | rcu_read_lock_bh(); |
416 | list_for_each_entry_rcu(tunnel, &pn->l2tp_tunnel_list, list) { | |
fd558d18 | 417 | if (++count > nth) { |
e02d494d | 418 | rcu_read_unlock_bh(); |
fd558d18 JC |
419 | return tunnel; |
420 | } | |
421 | } | |
422 | ||
e02d494d | 423 | rcu_read_unlock_bh(); |
fd558d18 JC |
424 | |
425 | return NULL; | |
426 | } | |
427 | EXPORT_SYMBOL_GPL(l2tp_tunnel_find_nth); | |
428 | ||
429 | /***************************************************************************** | |
430 | * Receive data handling | |
431 | *****************************************************************************/ | |
432 | ||
433 | /* Queue a skb in order. We come here only if the skb has an L2TP sequence | |
434 | * number. | |
435 | */ | |
436 | static void l2tp_recv_queue_skb(struct l2tp_session *session, struct sk_buff *skb) | |
437 | { | |
438 | struct sk_buff *skbp; | |
439 | struct sk_buff *tmp; | |
f7faffa3 | 440 | u32 ns = L2TP_SKB_CB(skb)->ns; |
fd558d18 JC |
441 | |
442 | spin_lock_bh(&session->reorder_q.lock); | |
443 | skb_queue_walk_safe(&session->reorder_q, skbp, tmp) { | |
444 | if (L2TP_SKB_CB(skbp)->ns > ns) { | |
445 | __skb_queue_before(&session->reorder_q, skbp, skb); | |
a4ca44fa JP |
446 | l2tp_dbg(session, L2TP_MSG_SEQ, |
447 | "%s: pkt %hu, inserted before %hu, reorder_q len=%d\n", | |
448 | session->name, ns, L2TP_SKB_CB(skbp)->ns, | |
449 | skb_queue_len(&session->reorder_q)); | |
7b7c0719 | 450 | atomic_long_inc(&session->stats.rx_oos_packets); |
fd558d18 JC |
451 | goto out; |
452 | } | |
453 | } | |
454 | ||
455 | __skb_queue_tail(&session->reorder_q, skb); | |
456 | ||
457 | out: | |
458 | spin_unlock_bh(&session->reorder_q.lock); | |
459 | } | |
460 | ||
461 | /* Dequeue a single skb. | |
462 | */ | |
463 | static void l2tp_recv_dequeue_skb(struct l2tp_session *session, struct sk_buff *skb) | |
464 | { | |
465 | struct l2tp_tunnel *tunnel = session->tunnel; | |
466 | int length = L2TP_SKB_CB(skb)->length; | |
467 | ||
468 | /* We're about to requeue the skb, so return resources | |
469 | * to its current owner (a socket receive buffer). | |
470 | */ | |
471 | skb_orphan(skb); | |
472 | ||
7b7c0719 TP |
473 | atomic_long_inc(&tunnel->stats.rx_packets); |
474 | atomic_long_add(length, &tunnel->stats.rx_bytes); | |
475 | atomic_long_inc(&session->stats.rx_packets); | |
476 | atomic_long_add(length, &session->stats.rx_bytes); | |
fd558d18 JC |
477 | |
478 | if (L2TP_SKB_CB(skb)->has_seq) { | |
479 | /* Bump our Nr */ | |
480 | session->nr++; | |
8a1631d5 | 481 | session->nr &= session->nr_max; |
f7faffa3 | 482 | |
a4ca44fa JP |
483 | l2tp_dbg(session, L2TP_MSG_SEQ, "%s: updated nr to %hu\n", |
484 | session->name, session->nr); | |
fd558d18 JC |
485 | } |
486 | ||
487 | /* call private receive handler */ | |
488 | if (session->recv_skb != NULL) | |
489 | (*session->recv_skb)(session, skb, L2TP_SKB_CB(skb)->length); | |
490 | else | |
491 | kfree_skb(skb); | |
492 | ||
493 | if (session->deref) | |
494 | (*session->deref)(session); | |
495 | } | |
496 | ||
497 | /* Dequeue skbs from the session's reorder_q, subject to packet order. | |
498 | * Skbs that have been in the queue for too long are simply discarded. | |
499 | */ | |
500 | static void l2tp_recv_dequeue(struct l2tp_session *session) | |
501 | { | |
502 | struct sk_buff *skb; | |
503 | struct sk_buff *tmp; | |
504 | ||
505 | /* If the pkt at the head of the queue has the nr that we | |
506 | * expect to send up next, dequeue it and any other | |
507 | * in-sequence packets behind it. | |
508 | */ | |
e2e210c0 | 509 | start: |
fd558d18 JC |
510 | spin_lock_bh(&session->reorder_q.lock); |
511 | skb_queue_walk_safe(&session->reorder_q, skb, tmp) { | |
512 | if (time_after(jiffies, L2TP_SKB_CB(skb)->expires)) { | |
7b7c0719 TP |
513 | atomic_long_inc(&session->stats.rx_seq_discards); |
514 | atomic_long_inc(&session->stats.rx_errors); | |
a4ca44fa JP |
515 | l2tp_dbg(session, L2TP_MSG_SEQ, |
516 | "%s: oos pkt %u len %d discarded (too old), waiting for %u, reorder_q_len=%d\n", | |
517 | session->name, L2TP_SKB_CB(skb)->ns, | |
518 | L2TP_SKB_CB(skb)->length, session->nr, | |
519 | skb_queue_len(&session->reorder_q)); | |
38d40b3f | 520 | session->reorder_skip = 1; |
fd558d18 JC |
521 | __skb_unlink(skb, &session->reorder_q); |
522 | kfree_skb(skb); | |
523 | if (session->deref) | |
524 | (*session->deref)(session); | |
525 | continue; | |
526 | } | |
527 | ||
528 | if (L2TP_SKB_CB(skb)->has_seq) { | |
38d40b3f | 529 | if (session->reorder_skip) { |
a4ca44fa JP |
530 | l2tp_dbg(session, L2TP_MSG_SEQ, |
531 | "%s: advancing nr to next pkt: %u -> %u", | |
532 | session->name, session->nr, | |
533 | L2TP_SKB_CB(skb)->ns); | |
38d40b3f JC |
534 | session->reorder_skip = 0; |
535 | session->nr = L2TP_SKB_CB(skb)->ns; | |
536 | } | |
fd558d18 | 537 | if (L2TP_SKB_CB(skb)->ns != session->nr) { |
a4ca44fa JP |
538 | l2tp_dbg(session, L2TP_MSG_SEQ, |
539 | "%s: holding oos pkt %u len %d, waiting for %u, reorder_q_len=%d\n", | |
540 | session->name, L2TP_SKB_CB(skb)->ns, | |
541 | L2TP_SKB_CB(skb)->length, session->nr, | |
542 | skb_queue_len(&session->reorder_q)); | |
fd558d18 JC |
543 | goto out; |
544 | } | |
545 | } | |
546 | __skb_unlink(skb, &session->reorder_q); | |
547 | ||
548 | /* Process the skb. We release the queue lock while we | |
549 | * do so to let other contexts process the queue. | |
550 | */ | |
551 | spin_unlock_bh(&session->reorder_q.lock); | |
552 | l2tp_recv_dequeue_skb(session, skb); | |
e2e210c0 | 553 | goto start; |
fd558d18 JC |
554 | } |
555 | ||
556 | out: | |
557 | spin_unlock_bh(&session->reorder_q.lock); | |
558 | } | |
559 | ||
8a1631d5 JC |
560 | static int l2tp_seq_check_rx_window(struct l2tp_session *session, u32 nr) |
561 | { | |
562 | u32 nws; | |
563 | ||
564 | if (nr >= session->nr) | |
565 | nws = nr - session->nr; | |
566 | else | |
567 | nws = (session->nr_max + 1) - (session->nr - nr); | |
568 | ||
569 | return nws < session->nr_window_size; | |
570 | } | |
571 | ||
b6dc01a4 JC |
572 | /* If packet has sequence numbers, queue it if acceptable. Returns 0 if |
573 | * acceptable, else non-zero. | |
574 | */ | |
575 | static int l2tp_recv_data_seq(struct l2tp_session *session, struct sk_buff *skb) | |
576 | { | |
8a1631d5 JC |
577 | if (!l2tp_seq_check_rx_window(session, L2TP_SKB_CB(skb)->ns)) { |
578 | /* Packet sequence number is outside allowed window. | |
579 | * Discard it. | |
580 | */ | |
581 | l2tp_dbg(session, L2TP_MSG_SEQ, | |
582 | "%s: pkt %u len %d discarded, outside window, nr=%u\n", | |
583 | session->name, L2TP_SKB_CB(skb)->ns, | |
584 | L2TP_SKB_CB(skb)->length, session->nr); | |
585 | goto discard; | |
586 | } | |
587 | ||
b6dc01a4 JC |
588 | if (session->reorder_timeout != 0) { |
589 | /* Packet reordering enabled. Add skb to session's | |
590 | * reorder queue, in order of ns. | |
591 | */ | |
592 | l2tp_recv_queue_skb(session, skb); | |
a0dbd822 JC |
593 | goto out; |
594 | } | |
595 | ||
596 | /* Packet reordering disabled. Discard out-of-sequence packets, while | |
597 | * tracking the number if in-sequence packets after the first OOS packet | |
598 | * is seen. After nr_oos_count_max in-sequence packets, reset the | |
599 | * sequence number to re-enable packet reception. | |
600 | */ | |
601 | if (L2TP_SKB_CB(skb)->ns == session->nr) { | |
602 | skb_queue_tail(&session->reorder_q, skb); | |
b6dc01a4 | 603 | } else { |
a0dbd822 JC |
604 | u32 nr_oos = L2TP_SKB_CB(skb)->ns; |
605 | u32 nr_next = (session->nr_oos + 1) & session->nr_max; | |
606 | ||
607 | if (nr_oos == nr_next) | |
608 | session->nr_oos_count++; | |
609 | else | |
610 | session->nr_oos_count = 0; | |
611 | ||
612 | session->nr_oos = nr_oos; | |
613 | if (session->nr_oos_count > session->nr_oos_count_max) { | |
614 | session->reorder_skip = 1; | |
615 | l2tp_dbg(session, L2TP_MSG_SEQ, | |
616 | "%s: %d oos packets received. Resetting sequence numbers\n", | |
617 | session->name, session->nr_oos_count); | |
618 | } | |
619 | if (!session->reorder_skip) { | |
b6dc01a4 JC |
620 | atomic_long_inc(&session->stats.rx_seq_discards); |
621 | l2tp_dbg(session, L2TP_MSG_SEQ, | |
622 | "%s: oos pkt %u len %d discarded, waiting for %u, reorder_q_len=%d\n", | |
623 | session->name, L2TP_SKB_CB(skb)->ns, | |
624 | L2TP_SKB_CB(skb)->length, session->nr, | |
625 | skb_queue_len(&session->reorder_q)); | |
626 | goto discard; | |
627 | } | |
628 | skb_queue_tail(&session->reorder_q, skb); | |
629 | } | |
630 | ||
a0dbd822 | 631 | out: |
b6dc01a4 JC |
632 | return 0; |
633 | ||
634 | discard: | |
635 | return 1; | |
636 | } | |
637 | ||
f7faffa3 JC |
638 | /* Do receive processing of L2TP data frames. We handle both L2TPv2 |
639 | * and L2TPv3 data frames here. | |
640 | * | |
641 | * L2TPv2 Data Message Header | |
642 | * | |
643 | * 0 1 2 3 | |
644 | * 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 | |
645 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
646 | * |T|L|x|x|S|x|O|P|x|x|x|x| Ver | Length (opt) | | |
647 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
648 | * | Tunnel ID | Session ID | | |
649 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
650 | * | Ns (opt) | Nr (opt) | | |
651 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
652 | * | Offset Size (opt) | Offset pad... (opt) | |
653 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
654 | * | |
655 | * Data frames are marked by T=0. All other fields are the same as | |
656 | * those in L2TP control frames. | |
657 | * | |
658 | * L2TPv3 Data Message Header | |
659 | * | |
660 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
661 | * | L2TP Session Header | | |
662 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
663 | * | L2-Specific Sublayer | | |
664 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
665 | * | Tunnel Payload ... | |
666 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
667 | * | |
668 | * L2TPv3 Session Header Over IP | |
669 | * | |
670 | * 0 1 2 3 | |
671 | * 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 | |
672 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
673 | * | Session ID | | |
674 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
675 | * | Cookie (optional, maximum 64 bits)... | |
676 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
677 | * | | |
678 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
679 | * | |
680 | * L2TPv3 L2-Specific Sublayer Format | |
681 | * | |
682 | * 0 1 2 3 | |
683 | * 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 | |
684 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
685 | * |x|S|x|x|x|x|x|x| Sequence Number | | |
686 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
687 | * | |
688 | * Cookie value, sublayer format and offset (pad) are negotiated with | |
689 | * the peer when the session is set up. Unlike L2TPv2, we do not need | |
690 | * to parse the packet header to determine if optional fields are | |
691 | * present. | |
692 | * | |
693 | * Caller must already have parsed the frame and determined that it is | |
694 | * a data (not control) frame before coming here. Fields up to the | |
695 | * session-id have already been parsed and ptr points to the data | |
696 | * after the session-id. | |
61b9a047 GN |
697 | * |
698 | * session->ref() must have been called prior to l2tp_recv_common(). | |
699 | * session->deref() will be called automatically after skb is processed. | |
fd558d18 | 700 | */ |
f7faffa3 JC |
701 | void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb, |
702 | unsigned char *ptr, unsigned char *optr, u16 hdrflags, | |
703 | int length, int (*payload_hook)(struct sk_buff *skb)) | |
fd558d18 | 704 | { |
f7faffa3 | 705 | struct l2tp_tunnel *tunnel = session->tunnel; |
fd558d18 | 706 | int offset; |
f7faffa3 | 707 | u32 ns, nr; |
fd558d18 | 708 | |
f7faffa3 JC |
709 | /* Parse and check optional cookie */ |
710 | if (session->peer_cookie_len > 0) { | |
711 | if (memcmp(ptr, &session->peer_cookie[0], session->peer_cookie_len)) { | |
a4ca44fa JP |
712 | l2tp_info(tunnel, L2TP_MSG_DATA, |
713 | "%s: cookie mismatch (%u/%u). Discarding.\n", | |
714 | tunnel->name, tunnel->tunnel_id, | |
715 | session->session_id); | |
7b7c0719 | 716 | atomic_long_inc(&session->stats.rx_cookie_discards); |
f7faffa3 JC |
717 | goto discard; |
718 | } | |
719 | ptr += session->peer_cookie_len; | |
720 | } | |
721 | ||
fd558d18 JC |
722 | /* Handle the optional sequence numbers. Sequence numbers are |
723 | * in different places for L2TPv2 and L2TPv3. | |
724 | * | |
725 | * If we are the LAC, enable/disable sequence numbers under | |
726 | * the control of the LNS. If no sequence numbers present but | |
727 | * we were expecting them, discard frame. | |
728 | */ | |
729 | ns = nr = 0; | |
730 | L2TP_SKB_CB(skb)->has_seq = 0; | |
f7faffa3 JC |
731 | if (tunnel->version == L2TP_HDR_VER_2) { |
732 | if (hdrflags & L2TP_HDRFLAG_S) { | |
733 | ns = ntohs(*(__be16 *) ptr); | |
734 | ptr += 2; | |
735 | nr = ntohs(*(__be16 *) ptr); | |
736 | ptr += 2; | |
fd558d18 | 737 | |
f7faffa3 JC |
738 | /* Store L2TP info in the skb */ |
739 | L2TP_SKB_CB(skb)->ns = ns; | |
740 | L2TP_SKB_CB(skb)->has_seq = 1; | |
fd558d18 | 741 | |
a4ca44fa JP |
742 | l2tp_dbg(session, L2TP_MSG_SEQ, |
743 | "%s: recv data ns=%u, nr=%u, session nr=%u\n", | |
744 | session->name, ns, nr, session->nr); | |
f7faffa3 JC |
745 | } |
746 | } else if (session->l2specific_type == L2TP_L2SPECTYPE_DEFAULT) { | |
747 | u32 l2h = ntohl(*(__be32 *) ptr); | |
748 | ||
749 | if (l2h & 0x40000000) { | |
750 | ns = l2h & 0x00ffffff; | |
751 | ||
752 | /* Store L2TP info in the skb */ | |
753 | L2TP_SKB_CB(skb)->ns = ns; | |
754 | L2TP_SKB_CB(skb)->has_seq = 1; | |
755 | ||
a4ca44fa JP |
756 | l2tp_dbg(session, L2TP_MSG_SEQ, |
757 | "%s: recv data ns=%u, session nr=%u\n", | |
758 | session->name, ns, session->nr); | |
f7faffa3 | 759 | } |
fd558d18 JC |
760 | } |
761 | ||
f7faffa3 JC |
762 | /* Advance past L2-specific header, if present */ |
763 | ptr += session->l2specific_len; | |
764 | ||
fd558d18 JC |
765 | if (L2TP_SKB_CB(skb)->has_seq) { |
766 | /* Received a packet with sequence numbers. If we're the LNS, | |
767 | * check if we sre sending sequence numbers and if not, | |
768 | * configure it so. | |
769 | */ | |
770 | if ((!session->lns_mode) && (!session->send_seq)) { | |
a4ca44fa JP |
771 | l2tp_info(session, L2TP_MSG_SEQ, |
772 | "%s: requested to enable seq numbers by LNS\n", | |
773 | session->name); | |
3f9b9770 | 774 | session->send_seq = 1; |
f7faffa3 | 775 | l2tp_session_set_header_len(session, tunnel->version); |
fd558d18 JC |
776 | } |
777 | } else { | |
778 | /* No sequence numbers. | |
779 | * If user has configured mandatory sequence numbers, discard. | |
780 | */ | |
781 | if (session->recv_seq) { | |
a4ca44fa JP |
782 | l2tp_warn(session, L2TP_MSG_SEQ, |
783 | "%s: recv data has no seq numbers when required. Discarding.\n", | |
784 | session->name); | |
7b7c0719 | 785 | atomic_long_inc(&session->stats.rx_seq_discards); |
fd558d18 JC |
786 | goto discard; |
787 | } | |
788 | ||
789 | /* If we're the LAC and we're sending sequence numbers, the | |
790 | * LNS has requested that we no longer send sequence numbers. | |
791 | * If we're the LNS and we're sending sequence numbers, the | |
792 | * LAC is broken. Discard the frame. | |
793 | */ | |
794 | if ((!session->lns_mode) && (session->send_seq)) { | |
a4ca44fa JP |
795 | l2tp_info(session, L2TP_MSG_SEQ, |
796 | "%s: requested to disable seq numbers by LNS\n", | |
797 | session->name); | |
fd558d18 | 798 | session->send_seq = 0; |
f7faffa3 | 799 | l2tp_session_set_header_len(session, tunnel->version); |
fd558d18 | 800 | } else if (session->send_seq) { |
a4ca44fa JP |
801 | l2tp_warn(session, L2TP_MSG_SEQ, |
802 | "%s: recv data has no seq numbers when required. Discarding.\n", | |
803 | session->name); | |
7b7c0719 | 804 | atomic_long_inc(&session->stats.rx_seq_discards); |
fd558d18 JC |
805 | goto discard; |
806 | } | |
807 | } | |
808 | ||
f7faffa3 JC |
809 | /* Session data offset is handled differently for L2TPv2 and |
810 | * L2TPv3. For L2TPv2, there is an optional 16-bit value in | |
811 | * the header. For L2TPv3, the offset is negotiated using AVPs | |
812 | * in the session setup control protocol. | |
813 | */ | |
814 | if (tunnel->version == L2TP_HDR_VER_2) { | |
815 | /* If offset bit set, skip it. */ | |
816 | if (hdrflags & L2TP_HDRFLAG_O) { | |
817 | offset = ntohs(*(__be16 *)ptr); | |
818 | ptr += 2 + offset; | |
819 | } | |
820 | } else | |
821 | ptr += session->offset; | |
fd558d18 JC |
822 | |
823 | offset = ptr - optr; | |
824 | if (!pskb_may_pull(skb, offset)) | |
825 | goto discard; | |
826 | ||
827 | __skb_pull(skb, offset); | |
828 | ||
829 | /* If caller wants to process the payload before we queue the | |
830 | * packet, do so now. | |
831 | */ | |
832 | if (payload_hook) | |
833 | if ((*payload_hook)(skb)) | |
834 | goto discard; | |
835 | ||
836 | /* Prepare skb for adding to the session's reorder_q. Hold | |
837 | * packets for max reorder_timeout or 1 second if not | |
838 | * reordering. | |
839 | */ | |
840 | L2TP_SKB_CB(skb)->length = length; | |
841 | L2TP_SKB_CB(skb)->expires = jiffies + | |
842 | (session->reorder_timeout ? session->reorder_timeout : HZ); | |
843 | ||
844 | /* Add packet to the session's receive queue. Reordering is done here, if | |
845 | * enabled. Saved L2TP protocol info is stored in skb->sb[]. | |
846 | */ | |
847 | if (L2TP_SKB_CB(skb)->has_seq) { | |
b6dc01a4 JC |
848 | if (l2tp_recv_data_seq(session, skb)) |
849 | goto discard; | |
fd558d18 JC |
850 | } else { |
851 | /* No sequence numbers. Add the skb to the tail of the | |
852 | * reorder queue. This ensures that it will be | |
853 | * delivered after all previous sequenced skbs. | |
854 | */ | |
855 | skb_queue_tail(&session->reorder_q, skb); | |
856 | } | |
857 | ||
858 | /* Try to dequeue as many skbs from reorder_q as we can. */ | |
859 | l2tp_recv_dequeue(session); | |
860 | ||
f7faffa3 | 861 | return; |
fd558d18 JC |
862 | |
863 | discard: | |
7b7c0719 | 864 | atomic_long_inc(&session->stats.rx_errors); |
fd558d18 JC |
865 | kfree_skb(skb); |
866 | ||
867 | if (session->deref) | |
868 | (*session->deref)(session); | |
f7faffa3 JC |
869 | } |
870 | EXPORT_SYMBOL(l2tp_recv_common); | |
871 | ||
48f72f92 TP |
872 | /* Drop skbs from the session's reorder_q |
873 | */ | |
874 | int l2tp_session_queue_purge(struct l2tp_session *session) | |
875 | { | |
876 | struct sk_buff *skb = NULL; | |
877 | BUG_ON(!session); | |
878 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
879 | while ((skb = skb_dequeue(&session->reorder_q))) { | |
880 | atomic_long_inc(&session->stats.rx_errors); | |
881 | kfree_skb(skb); | |
882 | if (session->deref) | |
883 | (*session->deref)(session); | |
884 | } | |
885 | return 0; | |
886 | } | |
887 | EXPORT_SYMBOL_GPL(l2tp_session_queue_purge); | |
888 | ||
f7faffa3 JC |
889 | /* Internal UDP receive frame. Do the real work of receiving an L2TP data frame |
890 | * here. The skb is not on a list when we get here. | |
891 | * Returns 0 if the packet was a data packet and was successfully passed on. | |
892 | * Returns 1 if the packet was not a good data packet and could not be | |
893 | * forwarded. All such packets are passed up to userspace to deal with. | |
894 | */ | |
fc130840 | 895 | static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb, |
896 | int (*payload_hook)(struct sk_buff *skb)) | |
f7faffa3 JC |
897 | { |
898 | struct l2tp_session *session = NULL; | |
899 | unsigned char *ptr, *optr; | |
900 | u16 hdrflags; | |
901 | u32 tunnel_id, session_id; | |
f7faffa3 JC |
902 | u16 version; |
903 | int length; | |
904 | ||
58d6085c | 905 | /* UDP has verifed checksum */ |
f7faffa3 JC |
906 | |
907 | /* UDP always verifies the packet length. */ | |
908 | __skb_pull(skb, sizeof(struct udphdr)); | |
909 | ||
910 | /* Short packet? */ | |
911 | if (!pskb_may_pull(skb, L2TP_HDR_SIZE_SEQ)) { | |
a4ca44fa JP |
912 | l2tp_info(tunnel, L2TP_MSG_DATA, |
913 | "%s: recv short packet (len=%d)\n", | |
914 | tunnel->name, skb->len); | |
f7faffa3 JC |
915 | goto error; |
916 | } | |
917 | ||
f7faffa3 JC |
918 | /* Trace packet contents, if enabled */ |
919 | if (tunnel->debug & L2TP_MSG_DATA) { | |
920 | length = min(32u, skb->len); | |
921 | if (!pskb_may_pull(skb, length)) | |
922 | goto error; | |
923 | ||
a4ca44fa JP |
924 | pr_debug("%s: recv\n", tunnel->name); |
925 | print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, skb->data, length); | |
f7faffa3 JC |
926 | } |
927 | ||
e50e705c ED |
928 | /* Point to L2TP header */ |
929 | optr = ptr = skb->data; | |
930 | ||
f7faffa3 JC |
931 | /* Get L2TP header flags */ |
932 | hdrflags = ntohs(*(__be16 *) ptr); | |
933 | ||
934 | /* Check protocol version */ | |
935 | version = hdrflags & L2TP_HDR_VER_MASK; | |
936 | if (version != tunnel->version) { | |
a4ca44fa JP |
937 | l2tp_info(tunnel, L2TP_MSG_DATA, |
938 | "%s: recv protocol version mismatch: got %d expected %d\n", | |
939 | tunnel->name, version, tunnel->version); | |
f7faffa3 JC |
940 | goto error; |
941 | } | |
942 | ||
943 | /* Get length of L2TP packet */ | |
944 | length = skb->len; | |
945 | ||
946 | /* If type is control packet, it is handled by userspace. */ | |
947 | if (hdrflags & L2TP_HDRFLAG_T) { | |
a4ca44fa JP |
948 | l2tp_dbg(tunnel, L2TP_MSG_DATA, |
949 | "%s: recv control packet, len=%d\n", | |
950 | tunnel->name, length); | |
f7faffa3 JC |
951 | goto error; |
952 | } | |
953 | ||
954 | /* Skip flags */ | |
955 | ptr += 2; | |
956 | ||
957 | if (tunnel->version == L2TP_HDR_VER_2) { | |
958 | /* If length is present, skip it */ | |
959 | if (hdrflags & L2TP_HDRFLAG_L) | |
960 | ptr += 2; | |
961 | ||
962 | /* Extract tunnel and session ID */ | |
963 | tunnel_id = ntohs(*(__be16 *) ptr); | |
964 | ptr += 2; | |
965 | session_id = ntohs(*(__be16 *) ptr); | |
966 | ptr += 2; | |
967 | } else { | |
968 | ptr += 2; /* skip reserved bits */ | |
969 | tunnel_id = tunnel->tunnel_id; | |
970 | session_id = ntohl(*(__be32 *) ptr); | |
971 | ptr += 4; | |
972 | } | |
973 | ||
974 | /* Find the session context */ | |
61b9a047 | 975 | session = l2tp_session_get(tunnel->l2tp_net, tunnel, session_id, true); |
309795f4 | 976 | if (!session || !session->recv_skb) { |
61b9a047 GN |
977 | if (session) { |
978 | if (session->deref) | |
979 | session->deref(session); | |
980 | l2tp_session_dec_refcount(session); | |
981 | } | |
982 | ||
f7faffa3 | 983 | /* Not found? Pass to userspace to deal with */ |
a4ca44fa JP |
984 | l2tp_info(tunnel, L2TP_MSG_DATA, |
985 | "%s: no session found (%u/%u). Passing up.\n", | |
986 | tunnel->name, tunnel_id, session_id); | |
f7faffa3 JC |
987 | goto error; |
988 | } | |
989 | ||
990 | l2tp_recv_common(session, skb, ptr, optr, hdrflags, length, payload_hook); | |
61b9a047 | 991 | l2tp_session_dec_refcount(session); |
fd558d18 JC |
992 | |
993 | return 0; | |
994 | ||
fd558d18 JC |
995 | error: |
996 | /* Put UDP header back */ | |
997 | __skb_push(skb, sizeof(struct udphdr)); | |
998 | ||
999 | return 1; | |
1000 | } | |
fd558d18 JC |
1001 | |
1002 | /* UDP encapsulation receive handler. See net/ipv4/udp.c. | |
1003 | * Return codes: | |
1004 | * 0 : success. | |
1005 | * <0: error | |
1006 | * >0: skb should be passed up to userspace as UDP. | |
1007 | */ | |
1008 | int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
1009 | { | |
1010 | struct l2tp_tunnel *tunnel; | |
1011 | ||
1012 | tunnel = l2tp_sock_to_tunnel(sk); | |
1013 | if (tunnel == NULL) | |
1014 | goto pass_up; | |
1015 | ||
a4ca44fa JP |
1016 | l2tp_dbg(tunnel, L2TP_MSG_DATA, "%s: received %d bytes\n", |
1017 | tunnel->name, skb->len); | |
fd558d18 JC |
1018 | |
1019 | if (l2tp_udp_recv_core(tunnel, skb, tunnel->recv_payload_hook)) | |
1020 | goto pass_up_put; | |
1021 | ||
1022 | sock_put(sk); | |
1023 | return 0; | |
1024 | ||
1025 | pass_up_put: | |
1026 | sock_put(sk); | |
1027 | pass_up: | |
1028 | return 1; | |
1029 | } | |
1030 | EXPORT_SYMBOL_GPL(l2tp_udp_encap_recv); | |
1031 | ||
1032 | /************************************************************************ | |
1033 | * Transmit handling | |
1034 | ***********************************************************************/ | |
1035 | ||
1036 | /* Build an L2TP header for the session into the buffer provided. | |
1037 | */ | |
f7faffa3 | 1038 | static int l2tp_build_l2tpv2_header(struct l2tp_session *session, void *buf) |
fd558d18 | 1039 | { |
f7faffa3 | 1040 | struct l2tp_tunnel *tunnel = session->tunnel; |
fd558d18 | 1041 | __be16 *bufp = buf; |
f7faffa3 | 1042 | __be16 *optr = buf; |
fd558d18 JC |
1043 | u16 flags = L2TP_HDR_VER_2; |
1044 | u32 tunnel_id = tunnel->peer_tunnel_id; | |
1045 | u32 session_id = session->peer_session_id; | |
1046 | ||
1047 | if (session->send_seq) | |
1048 | flags |= L2TP_HDRFLAG_S; | |
1049 | ||
1050 | /* Setup L2TP header. */ | |
1051 | *bufp++ = htons(flags); | |
1052 | *bufp++ = htons(tunnel_id); | |
1053 | *bufp++ = htons(session_id); | |
1054 | if (session->send_seq) { | |
1055 | *bufp++ = htons(session->ns); | |
1056 | *bufp++ = 0; | |
1057 | session->ns++; | |
f7faffa3 | 1058 | session->ns &= 0xffff; |
a4ca44fa JP |
1059 | l2tp_dbg(session, L2TP_MSG_SEQ, "%s: updated ns to %u\n", |
1060 | session->name, session->ns); | |
fd558d18 | 1061 | } |
f7faffa3 JC |
1062 | |
1063 | return bufp - optr; | |
fd558d18 JC |
1064 | } |
1065 | ||
f7faffa3 | 1066 | static int l2tp_build_l2tpv3_header(struct l2tp_session *session, void *buf) |
fd558d18 | 1067 | { |
0d76751f | 1068 | struct l2tp_tunnel *tunnel = session->tunnel; |
f7faffa3 JC |
1069 | char *bufp = buf; |
1070 | char *optr = bufp; | |
f7faffa3 | 1071 | |
0d76751f JC |
1072 | /* Setup L2TP header. The header differs slightly for UDP and |
1073 | * IP encapsulations. For UDP, there is 4 bytes of flags. | |
1074 | */ | |
1075 | if (tunnel->encap == L2TP_ENCAPTYPE_UDP) { | |
1076 | u16 flags = L2TP_HDR_VER_3; | |
1077 | *((__be16 *) bufp) = htons(flags); | |
1078 | bufp += 2; | |
1079 | *((__be16 *) bufp) = 0; | |
1080 | bufp += 2; | |
1081 | } | |
1082 | ||
f7faffa3 JC |
1083 | *((__be32 *) bufp) = htonl(session->peer_session_id); |
1084 | bufp += 4; | |
1085 | if (session->cookie_len) { | |
1086 | memcpy(bufp, &session->cookie[0], session->cookie_len); | |
1087 | bufp += session->cookie_len; | |
1088 | } | |
1089 | if (session->l2specific_len) { | |
1090 | if (session->l2specific_type == L2TP_L2SPECTYPE_DEFAULT) { | |
1091 | u32 l2h = 0; | |
1092 | if (session->send_seq) { | |
1093 | l2h = 0x40000000 | session->ns; | |
1094 | session->ns++; | |
1095 | session->ns &= 0xffffff; | |
a4ca44fa JP |
1096 | l2tp_dbg(session, L2TP_MSG_SEQ, |
1097 | "%s: updated ns to %u\n", | |
1098 | session->name, session->ns); | |
f7faffa3 JC |
1099 | } |
1100 | ||
1101 | *((__be32 *) bufp) = htonl(l2h); | |
1102 | } | |
1103 | bufp += session->l2specific_len; | |
1104 | } | |
1105 | if (session->offset) | |
1106 | bufp += session->offset; | |
fd558d18 | 1107 | |
f7faffa3 | 1108 | return bufp - optr; |
fd558d18 | 1109 | } |
fd558d18 | 1110 | |
fc130840 | 1111 | static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb, |
d9d8da80 | 1112 | struct flowi *fl, size_t data_len) |
fd558d18 JC |
1113 | { |
1114 | struct l2tp_tunnel *tunnel = session->tunnel; | |
1115 | unsigned int len = skb->len; | |
1116 | int error; | |
1117 | ||
1118 | /* Debug */ | |
1119 | if (session->send_seq) | |
5b5e0928 | 1120 | l2tp_dbg(session, L2TP_MSG_DATA, "%s: send %zd bytes, ns=%u\n", |
a4ca44fa | 1121 | session->name, data_len, session->ns - 1); |
fd558d18 | 1122 | else |
5b5e0928 | 1123 | l2tp_dbg(session, L2TP_MSG_DATA, "%s: send %zd bytes\n", |
a4ca44fa | 1124 | session->name, data_len); |
fd558d18 JC |
1125 | |
1126 | if (session->debug & L2TP_MSG_DATA) { | |
0d76751f JC |
1127 | int uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
1128 | unsigned char *datap = skb->data + uhlen; | |
fd558d18 | 1129 | |
a4ca44fa JP |
1130 | pr_debug("%s: xmit\n", session->name); |
1131 | print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, | |
1132 | datap, min_t(size_t, 32, len - uhlen)); | |
fd558d18 JC |
1133 | } |
1134 | ||
1135 | /* Queue the packet to IP for output */ | |
60ff7467 | 1136 | skb->ignore_df = 1; |
d2cf3361 | 1137 | #if IS_ENABLED(CONFIG_IPV6) |
746e3499 | 1138 | if (tunnel->sock->sk_family == PF_INET6 && !tunnel->v4mapped) |
b0270e91 | 1139 | error = inet6_csk_xmit(tunnel->sock, skb, NULL); |
d2cf3361 BL |
1140 | else |
1141 | #endif | |
b0270e91 | 1142 | error = ip_queue_xmit(tunnel->sock, skb, fl); |
fd558d18 JC |
1143 | |
1144 | /* Update stats */ | |
1145 | if (error >= 0) { | |
7b7c0719 TP |
1146 | atomic_long_inc(&tunnel->stats.tx_packets); |
1147 | atomic_long_add(len, &tunnel->stats.tx_bytes); | |
1148 | atomic_long_inc(&session->stats.tx_packets); | |
1149 | atomic_long_add(len, &session->stats.tx_bytes); | |
fd558d18 | 1150 | } else { |
7b7c0719 TP |
1151 | atomic_long_inc(&tunnel->stats.tx_errors); |
1152 | atomic_long_inc(&session->stats.tx_errors); | |
fd558d18 JC |
1153 | } |
1154 | ||
1155 | return 0; | |
1156 | } | |
fd558d18 | 1157 | |
fd558d18 JC |
1158 | /* If caller requires the skb to have a ppp header, the header must be |
1159 | * inserted in the skb data before calling this function. | |
1160 | */ | |
1161 | int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len) | |
1162 | { | |
1163 | int data_len = skb->len; | |
0d76751f JC |
1164 | struct l2tp_tunnel *tunnel = session->tunnel; |
1165 | struct sock *sk = tunnel->sock; | |
d9d8da80 | 1166 | struct flowi *fl; |
fd558d18 | 1167 | struct udphdr *uh; |
fd558d18 | 1168 | struct inet_sock *inet; |
fd558d18 | 1169 | int headroom; |
0d76751f JC |
1170 | int uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
1171 | int udp_len; | |
b8c84307 | 1172 | int ret = NET_XMIT_SUCCESS; |
fd558d18 JC |
1173 | |
1174 | /* Check that there's enough headroom in the skb to insert IP, | |
1175 | * UDP and L2TP headers. If not enough, expand it to | |
1176 | * make room. Adjust truesize. | |
1177 | */ | |
1178 | headroom = NET_SKB_PAD + sizeof(struct iphdr) + | |
0d76751f | 1179 | uhlen + hdr_len; |
835acf5d | 1180 | if (skb_cow_head(skb, headroom)) { |
b8c84307 ED |
1181 | kfree_skb(skb); |
1182 | return NET_XMIT_DROP; | |
835acf5d | 1183 | } |
fd558d18 | 1184 | |
fd558d18 | 1185 | /* Setup L2TP header */ |
f7faffa3 | 1186 | session->build_header(session, __skb_push(skb, hdr_len)); |
fd558d18 | 1187 | |
0d76751f | 1188 | /* Reset skb netfilter state */ |
fd558d18 JC |
1189 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1190 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | | |
1191 | IPSKB_REROUTED); | |
1192 | nf_reset(skb); | |
1193 | ||
6af88da1 DM |
1194 | bh_lock_sock(sk); |
1195 | if (sock_owned_by_user(sk)) { | |
b8c84307 ED |
1196 | kfree_skb(skb); |
1197 | ret = NET_XMIT_DROP; | |
6af88da1 DM |
1198 | goto out_unlock; |
1199 | } | |
1200 | ||
fd558d18 JC |
1201 | /* Get routing info from the tunnel socket */ |
1202 | skb_dst_drop(skb); | |
71b1391a | 1203 | skb_dst_set(skb, dst_clone(__sk_dst_check(sk, 0))); |
fd558d18 | 1204 | |
d9d8da80 DM |
1205 | inet = inet_sk(sk); |
1206 | fl = &inet->cork.fl; | |
0d76751f JC |
1207 | switch (tunnel->encap) { |
1208 | case L2TP_ENCAPTYPE_UDP: | |
1209 | /* Setup UDP header */ | |
0d76751f JC |
1210 | __skb_push(skb, sizeof(*uh)); |
1211 | skb_reset_transport_header(skb); | |
1212 | uh = udp_hdr(skb); | |
1213 | uh->source = inet->inet_sport; | |
1214 | uh->dest = inet->inet_dport; | |
1215 | udp_len = uhlen + hdr_len + data_len; | |
1216 | uh->len = htons(udp_len); | |
0d76751f JC |
1217 | |
1218 | /* Calculate UDP checksum if configured to do so */ | |
d2cf3361 | 1219 | #if IS_ENABLED(CONFIG_IPV6) |
e18503f4 | 1220 | if (sk->sk_family == PF_INET6 && !tunnel->v4mapped) |
77157e19 TH |
1221 | udp6_set_csum(udp_get_no_check6_tx(sk), |
1222 | skb, &inet6_sk(sk)->saddr, | |
1223 | &sk->sk_v6_daddr, udp_len); | |
d2cf3361 BL |
1224 | else |
1225 | #endif | |
77157e19 TH |
1226 | udp_set_csum(sk->sk_no_check_tx, skb, inet->inet_saddr, |
1227 | inet->inet_daddr, udp_len); | |
0d76751f JC |
1228 | break; |
1229 | ||
1230 | case L2TP_ENCAPTYPE_IP: | |
1231 | break; | |
fd558d18 JC |
1232 | } |
1233 | ||
d9d8da80 | 1234 | l2tp_xmit_core(session, skb, fl, data_len); |
6af88da1 DM |
1235 | out_unlock: |
1236 | bh_unlock_sock(sk); | |
fd558d18 | 1237 | |
b8c84307 | 1238 | return ret; |
fd558d18 JC |
1239 | } |
1240 | EXPORT_SYMBOL_GPL(l2tp_xmit_skb); | |
1241 | ||
1242 | /***************************************************************************** | |
1243 | * Tinnel and session create/destroy. | |
1244 | *****************************************************************************/ | |
1245 | ||
1246 | /* Tunnel socket destruct hook. | |
1247 | * The tunnel context is deleted only when all session sockets have been | |
1248 | * closed. | |
1249 | */ | |
fc130840 | 1250 | static void l2tp_tunnel_destruct(struct sock *sk) |
fd558d18 | 1251 | { |
8d8a51e2 | 1252 | struct l2tp_tunnel *tunnel = l2tp_tunnel(sk); |
f8ccac0e | 1253 | struct l2tp_net *pn; |
fd558d18 | 1254 | |
fd558d18 JC |
1255 | if (tunnel == NULL) |
1256 | goto end; | |
1257 | ||
a4ca44fa | 1258 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: closing...\n", tunnel->name); |
fd558d18 | 1259 | |
fd558d18 | 1260 | |
f8ccac0e | 1261 | /* Disable udp encapsulation */ |
0d76751f JC |
1262 | switch (tunnel->encap) { |
1263 | case L2TP_ENCAPTYPE_UDP: | |
1264 | /* No longer an encapsulation socket. See net/ipv4/udp.c */ | |
1265 | (udp_sk(sk))->encap_type = 0; | |
1266 | (udp_sk(sk))->encap_rcv = NULL; | |
9980d001 | 1267 | (udp_sk(sk))->encap_destroy = NULL; |
0d76751f JC |
1268 | break; |
1269 | case L2TP_ENCAPTYPE_IP: | |
1270 | break; | |
1271 | } | |
fd558d18 JC |
1272 | |
1273 | /* Remove hooks into tunnel socket */ | |
fd558d18 JC |
1274 | sk->sk_destruct = tunnel->old_sk_destruct; |
1275 | sk->sk_user_data = NULL; | |
1276 | ||
f8ccac0e TP |
1277 | /* Remove the tunnel struct from the tunnel list */ |
1278 | pn = l2tp_pernet(tunnel->l2tp_net); | |
1279 | spin_lock_bh(&pn->l2tp_tunnel_list_lock); | |
1280 | list_del_rcu(&tunnel->list); | |
1281 | spin_unlock_bh(&pn->l2tp_tunnel_list_lock); | |
1282 | atomic_dec(&l2tp_tunnel_count); | |
fd558d18 | 1283 | |
f8ccac0e | 1284 | l2tp_tunnel_closeall(tunnel); |
f3c66d4e GN |
1285 | |
1286 | tunnel->sock = NULL; | |
fd558d18 JC |
1287 | l2tp_tunnel_dec_refcount(tunnel); |
1288 | ||
f8ccac0e TP |
1289 | /* Call the original destructor */ |
1290 | if (sk->sk_destruct) | |
1291 | (*sk->sk_destruct)(sk); | |
fd558d18 JC |
1292 | end: |
1293 | return; | |
1294 | } | |
fd558d18 JC |
1295 | |
1296 | /* When the tunnel is closed, all the attached sessions need to go too. | |
1297 | */ | |
e34f4c70 | 1298 | void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel) |
fd558d18 JC |
1299 | { |
1300 | int hash; | |
1301 | struct hlist_node *walk; | |
1302 | struct hlist_node *tmp; | |
1303 | struct l2tp_session *session; | |
1304 | ||
1305 | BUG_ON(tunnel == NULL); | |
1306 | ||
a4ca44fa JP |
1307 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: closing all sessions...\n", |
1308 | tunnel->name); | |
fd558d18 JC |
1309 | |
1310 | write_lock_bh(&tunnel->hlist_lock); | |
f3c66d4e | 1311 | tunnel->acpt_newsess = false; |
fd558d18 JC |
1312 | for (hash = 0; hash < L2TP_HASH_SIZE; hash++) { |
1313 | again: | |
1314 | hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) { | |
1315 | session = hlist_entry(walk, struct l2tp_session, hlist); | |
1316 | ||
a4ca44fa JP |
1317 | l2tp_info(session, L2TP_MSG_CONTROL, |
1318 | "%s: closing session\n", session->name); | |
fd558d18 JC |
1319 | |
1320 | hlist_del_init(&session->hlist); | |
1321 | ||
b228a940 GN |
1322 | if (test_and_set_bit(0, &session->dead)) |
1323 | goto again; | |
1324 | ||
fd558d18 JC |
1325 | if (session->ref != NULL) |
1326 | (*session->ref)(session); | |
1327 | ||
1328 | write_unlock_bh(&tunnel->hlist_lock); | |
1329 | ||
f6e16b29 | 1330 | __l2tp_session_unhash(session); |
4c6e2fd3 TP |
1331 | l2tp_session_queue_purge(session); |
1332 | ||
fd558d18 JC |
1333 | if (session->session_close != NULL) |
1334 | (*session->session_close)(session); | |
1335 | ||
1336 | if (session->deref != NULL) | |
1337 | (*session->deref)(session); | |
1338 | ||
9980d001 TP |
1339 | l2tp_session_dec_refcount(session); |
1340 | ||
fd558d18 JC |
1341 | write_lock_bh(&tunnel->hlist_lock); |
1342 | ||
1343 | /* Now restart from the beginning of this hash | |
1344 | * chain. We always remove a session from the | |
1345 | * list so we are guaranteed to make forward | |
1346 | * progress. | |
1347 | */ | |
1348 | goto again; | |
1349 | } | |
1350 | } | |
1351 | write_unlock_bh(&tunnel->hlist_lock); | |
1352 | } | |
e34f4c70 | 1353 | EXPORT_SYMBOL_GPL(l2tp_tunnel_closeall); |
fd558d18 | 1354 | |
9980d001 TP |
1355 | /* Tunnel socket destroy hook for UDP encapsulation */ |
1356 | static void l2tp_udp_encap_destroy(struct sock *sk) | |
1357 | { | |
1358 | struct l2tp_tunnel *tunnel = l2tp_sock_to_tunnel(sk); | |
1359 | if (tunnel) { | |
1360 | l2tp_tunnel_closeall(tunnel); | |
1361 | sock_put(sk); | |
1362 | } | |
1363 | } | |
1364 | ||
f8ccac0e TP |
1365 | /* Workqueue tunnel deletion function */ |
1366 | static void l2tp_tunnel_del_work(struct work_struct *work) | |
1367 | { | |
1368 | struct l2tp_tunnel *tunnel = NULL; | |
1369 | struct socket *sock = NULL; | |
1370 | struct sock *sk = NULL; | |
1371 | ||
1372 | tunnel = container_of(work, struct l2tp_tunnel, del_work); | |
12d656af RK |
1373 | |
1374 | l2tp_tunnel_closeall(tunnel); | |
1375 | ||
f8ccac0e TP |
1376 | sk = l2tp_tunnel_sock_lookup(tunnel); |
1377 | if (!sk) | |
06a15f51 | 1378 | goto out; |
f8ccac0e TP |
1379 | |
1380 | sock = sk->sk_socket; | |
f8ccac0e | 1381 | |
02d13ed5 TP |
1382 | /* If the tunnel socket was created by userspace, then go through the |
1383 | * inet layer to shut the socket down, and let userspace close it. | |
1384 | * Otherwise, if we created the socket directly within the kernel, use | |
1385 | * the sk API to release it here. | |
167eb17e TP |
1386 | * In either case the tunnel resources are freed in the socket |
1387 | * destructor when the tunnel socket goes away. | |
f8ccac0e | 1388 | */ |
02d13ed5 TP |
1389 | if (tunnel->fd >= 0) { |
1390 | if (sock) | |
1391 | inet_shutdown(sock, 2); | |
167eb17e | 1392 | } else { |
26abe143 | 1393 | if (sock) { |
02d13ed5 | 1394 | kernel_sock_shutdown(sock, SHUT_RDWR); |
26abe143 EB |
1395 | sock_release(sock); |
1396 | } | |
167eb17e | 1397 | } |
f8ccac0e TP |
1398 | |
1399 | l2tp_tunnel_sock_put(sk); | |
06a15f51 AC |
1400 | out: |
1401 | l2tp_tunnel_dec_refcount(tunnel); | |
fd558d18 | 1402 | } |
fd558d18 | 1403 | |
789a4a2c JC |
1404 | /* Create a socket for the tunnel, if one isn't set up by |
1405 | * userspace. This is used for static tunnels where there is no | |
1406 | * managing L2TP daemon. | |
167eb17e TP |
1407 | * |
1408 | * Since we don't want these sockets to keep a namespace alive by | |
1409 | * themselves, we drop the socket's namespace refcount after creation. | |
1410 | * These sockets are freed when the namespace exits using the pernet | |
1411 | * exit hook. | |
789a4a2c | 1412 | */ |
167eb17e TP |
1413 | static int l2tp_tunnel_sock_create(struct net *net, |
1414 | u32 tunnel_id, | |
1415 | u32 peer_tunnel_id, | |
1416 | struct l2tp_tunnel_cfg *cfg, | |
1417 | struct socket **sockp) | |
789a4a2c JC |
1418 | { |
1419 | int err = -EINVAL; | |
167eb17e | 1420 | struct socket *sock = NULL; |
85644b4d | 1421 | struct udp_port_cfg udp_conf; |
789a4a2c JC |
1422 | |
1423 | switch (cfg->encap) { | |
1424 | case L2TP_ENCAPTYPE_UDP: | |
85644b4d TH |
1425 | memset(&udp_conf, 0, sizeof(udp_conf)); |
1426 | ||
f9bac8df CE |
1427 | #if IS_ENABLED(CONFIG_IPV6) |
1428 | if (cfg->local_ip6 && cfg->peer_ip6) { | |
85644b4d TH |
1429 | udp_conf.family = AF_INET6; |
1430 | memcpy(&udp_conf.local_ip6, cfg->local_ip6, | |
1431 | sizeof(udp_conf.local_ip6)); | |
1432 | memcpy(&udp_conf.peer_ip6, cfg->peer_ip6, | |
1433 | sizeof(udp_conf.peer_ip6)); | |
1434 | udp_conf.use_udp6_tx_checksums = | |
018f8258 | 1435 | ! cfg->udp6_zero_tx_checksums; |
85644b4d | 1436 | udp_conf.use_udp6_rx_checksums = |
018f8258 | 1437 | ! cfg->udp6_zero_rx_checksums; |
f9bac8df CE |
1438 | } else |
1439 | #endif | |
1440 | { | |
85644b4d TH |
1441 | udp_conf.family = AF_INET; |
1442 | udp_conf.local_ip = cfg->local_ip; | |
1443 | udp_conf.peer_ip = cfg->peer_ip; | |
1444 | udp_conf.use_udp_checksums = cfg->use_udp_checksums; | |
f9bac8df | 1445 | } |
789a4a2c | 1446 | |
85644b4d TH |
1447 | udp_conf.local_udp_port = htons(cfg->local_udp_port); |
1448 | udp_conf.peer_udp_port = htons(cfg->peer_udp_port); | |
1449 | ||
1450 | err = udp_sock_create(net, &udp_conf, &sock); | |
1451 | if (err < 0) | |
1452 | goto out; | |
789a4a2c JC |
1453 | |
1454 | break; | |
1455 | ||
1456 | case L2TP_ENCAPTYPE_IP: | |
f9bac8df CE |
1457 | #if IS_ENABLED(CONFIG_IPV6) |
1458 | if (cfg->local_ip6 && cfg->peer_ip6) { | |
85644b4d TH |
1459 | struct sockaddr_l2tpip6 ip6_addr = {0}; |
1460 | ||
26abe143 | 1461 | err = sock_create_kern(net, AF_INET6, SOCK_DGRAM, |
167eb17e | 1462 | IPPROTO_L2TP, &sock); |
5dac94e1 JC |
1463 | if (err < 0) |
1464 | goto out; | |
789a4a2c | 1465 | |
5dac94e1 JC |
1466 | ip6_addr.l2tp_family = AF_INET6; |
1467 | memcpy(&ip6_addr.l2tp_addr, cfg->local_ip6, | |
1468 | sizeof(ip6_addr.l2tp_addr)); | |
1469 | ip6_addr.l2tp_conn_id = tunnel_id; | |
1470 | err = kernel_bind(sock, (struct sockaddr *) &ip6_addr, | |
1471 | sizeof(ip6_addr)); | |
1472 | if (err < 0) | |
1473 | goto out; | |
789a4a2c | 1474 | |
5dac94e1 JC |
1475 | ip6_addr.l2tp_family = AF_INET6; |
1476 | memcpy(&ip6_addr.l2tp_addr, cfg->peer_ip6, | |
1477 | sizeof(ip6_addr.l2tp_addr)); | |
1478 | ip6_addr.l2tp_conn_id = peer_tunnel_id; | |
1479 | err = kernel_connect(sock, | |
1480 | (struct sockaddr *) &ip6_addr, | |
1481 | sizeof(ip6_addr), 0); | |
1482 | if (err < 0) | |
1483 | goto out; | |
1484 | } else | |
1485 | #endif | |
1486 | { | |
85644b4d TH |
1487 | struct sockaddr_l2tpip ip_addr = {0}; |
1488 | ||
26abe143 | 1489 | err = sock_create_kern(net, AF_INET, SOCK_DGRAM, |
167eb17e | 1490 | IPPROTO_L2TP, &sock); |
5dac94e1 JC |
1491 | if (err < 0) |
1492 | goto out; | |
789a4a2c | 1493 | |
5dac94e1 JC |
1494 | ip_addr.l2tp_family = AF_INET; |
1495 | ip_addr.l2tp_addr = cfg->local_ip; | |
1496 | ip_addr.l2tp_conn_id = tunnel_id; | |
1497 | err = kernel_bind(sock, (struct sockaddr *) &ip_addr, | |
1498 | sizeof(ip_addr)); | |
1499 | if (err < 0) | |
1500 | goto out; | |
1501 | ||
1502 | ip_addr.l2tp_family = AF_INET; | |
1503 | ip_addr.l2tp_addr = cfg->peer_ip; | |
1504 | ip_addr.l2tp_conn_id = peer_tunnel_id; | |
1505 | err = kernel_connect(sock, (struct sockaddr *) &ip_addr, | |
1506 | sizeof(ip_addr), 0); | |
1507 | if (err < 0) | |
1508 | goto out; | |
1509 | } | |
789a4a2c JC |
1510 | break; |
1511 | ||
1512 | default: | |
1513 | goto out; | |
1514 | } | |
1515 | ||
1516 | out: | |
167eb17e | 1517 | *sockp = sock; |
789a4a2c | 1518 | if ((err < 0) && sock) { |
167eb17e | 1519 | kernel_sock_shutdown(sock, SHUT_RDWR); |
26abe143 | 1520 | sock_release(sock); |
789a4a2c JC |
1521 | *sockp = NULL; |
1522 | } | |
1523 | ||
1524 | return err; | |
1525 | } | |
1526 | ||
37159ef2 ED |
1527 | static struct lock_class_key l2tp_socket_class; |
1528 | ||
fd558d18 JC |
1529 | int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg, struct l2tp_tunnel **tunnelp) |
1530 | { | |
1531 | struct l2tp_tunnel *tunnel = NULL; | |
1532 | int err; | |
1533 | struct socket *sock = NULL; | |
1534 | struct sock *sk = NULL; | |
1535 | struct l2tp_net *pn; | |
0d76751f | 1536 | enum l2tp_encap_type encap = L2TP_ENCAPTYPE_UDP; |
fd558d18 JC |
1537 | |
1538 | /* Get the tunnel socket from the fd, which was opened by | |
789a4a2c JC |
1539 | * the userspace L2TP daemon. If not specified, create a |
1540 | * kernel socket. | |
fd558d18 | 1541 | */ |
789a4a2c | 1542 | if (fd < 0) { |
167eb17e TP |
1543 | err = l2tp_tunnel_sock_create(net, tunnel_id, peer_tunnel_id, |
1544 | cfg, &sock); | |
789a4a2c JC |
1545 | if (err < 0) |
1546 | goto err; | |
1547 | } else { | |
789a4a2c JC |
1548 | sock = sockfd_lookup(fd, &err); |
1549 | if (!sock) { | |
cbb95e0c | 1550 | pr_err("tunl %u: sockfd_lookup(fd=%d) returned %d\n", |
789a4a2c | 1551 | tunnel_id, fd, err); |
cbb95e0c TP |
1552 | err = -EBADF; |
1553 | goto err; | |
1554 | } | |
1555 | ||
1556 | /* Reject namespace mismatches */ | |
1557 | if (!net_eq(sock_net(sock->sk), net)) { | |
1558 | pr_err("tunl %u: netns mismatch\n", tunnel_id); | |
1559 | err = -EINVAL; | |
789a4a2c JC |
1560 | goto err; |
1561 | } | |
fd558d18 JC |
1562 | } |
1563 | ||
1564 | sk = sock->sk; | |
1565 | ||
0d76751f JC |
1566 | if (cfg != NULL) |
1567 | encap = cfg->encap; | |
1568 | ||
fd558d18 | 1569 | /* Quick sanity checks */ |
0d76751f JC |
1570 | switch (encap) { |
1571 | case L2TP_ENCAPTYPE_UDP: | |
1572 | err = -EPROTONOSUPPORT; | |
1573 | if (sk->sk_protocol != IPPROTO_UDP) { | |
a4ca44fa | 1574 | pr_err("tunl %hu: fd %d wrong protocol, got %d, expected %d\n", |
0d76751f JC |
1575 | tunnel_id, fd, sk->sk_protocol, IPPROTO_UDP); |
1576 | goto err; | |
1577 | } | |
1578 | break; | |
1579 | case L2TP_ENCAPTYPE_IP: | |
1580 | err = -EPROTONOSUPPORT; | |
1581 | if (sk->sk_protocol != IPPROTO_L2TP) { | |
a4ca44fa | 1582 | pr_err("tunl %hu: fd %d wrong protocol, got %d, expected %d\n", |
0d76751f JC |
1583 | tunnel_id, fd, sk->sk_protocol, IPPROTO_L2TP); |
1584 | goto err; | |
1585 | } | |
1586 | break; | |
fd558d18 JC |
1587 | } |
1588 | ||
1589 | /* Check if this socket has already been prepped */ | |
8d8a51e2 | 1590 | tunnel = l2tp_tunnel(sk); |
fd558d18 JC |
1591 | if (tunnel != NULL) { |
1592 | /* This socket has already been prepped */ | |
1593 | err = -EBUSY; | |
1594 | goto err; | |
1595 | } | |
1596 | ||
fd558d18 JC |
1597 | tunnel = kzalloc(sizeof(struct l2tp_tunnel), GFP_KERNEL); |
1598 | if (tunnel == NULL) { | |
1599 | err = -ENOMEM; | |
1600 | goto err; | |
1601 | } | |
1602 | ||
1603 | tunnel->version = version; | |
1604 | tunnel->tunnel_id = tunnel_id; | |
1605 | tunnel->peer_tunnel_id = peer_tunnel_id; | |
1606 | tunnel->debug = L2TP_DEFAULT_DEBUG_FLAGS; | |
1607 | ||
1608 | tunnel->magic = L2TP_TUNNEL_MAGIC; | |
1609 | sprintf(&tunnel->name[0], "tunl %u", tunnel_id); | |
1610 | rwlock_init(&tunnel->hlist_lock); | |
f3c66d4e | 1611 | tunnel->acpt_newsess = true; |
fd558d18 JC |
1612 | |
1613 | /* The net we belong to */ | |
1614 | tunnel->l2tp_net = net; | |
1615 | pn = l2tp_pernet(net); | |
1616 | ||
0d76751f | 1617 | if (cfg != NULL) |
fd558d18 JC |
1618 | tunnel->debug = cfg->debug; |
1619 | ||
e18503f4 FC |
1620 | #if IS_ENABLED(CONFIG_IPV6) |
1621 | if (sk->sk_family == PF_INET6) { | |
1622 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1623 | ||
1624 | if (ipv6_addr_v4mapped(&np->saddr) && | |
efe4208f | 1625 | ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { |
e18503f4 FC |
1626 | struct inet_sock *inet = inet_sk(sk); |
1627 | ||
1628 | tunnel->v4mapped = true; | |
1629 | inet->inet_saddr = np->saddr.s6_addr32[3]; | |
efe4208f ED |
1630 | inet->inet_rcv_saddr = sk->sk_v6_rcv_saddr.s6_addr32[3]; |
1631 | inet->inet_daddr = sk->sk_v6_daddr.s6_addr32[3]; | |
e18503f4 FC |
1632 | } else { |
1633 | tunnel->v4mapped = false; | |
1634 | } | |
1635 | } | |
1636 | #endif | |
1637 | ||
fd558d18 | 1638 | /* Mark socket as an encapsulation socket. See net/ipv4/udp.c */ |
0d76751f JC |
1639 | tunnel->encap = encap; |
1640 | if (encap == L2TP_ENCAPTYPE_UDP) { | |
a5c5e2da | 1641 | struct udp_tunnel_sock_cfg udp_cfg = { }; |
c8fffcea AZ |
1642 | |
1643 | udp_cfg.sk_user_data = tunnel; | |
1644 | udp_cfg.encap_type = UDP_ENCAP_L2TPINUDP; | |
1645 | udp_cfg.encap_rcv = l2tp_udp_encap_recv; | |
1646 | udp_cfg.encap_destroy = l2tp_udp_encap_destroy; | |
fd558d18 | 1647 | |
c8fffcea AZ |
1648 | setup_udp_tunnel_sock(net, sock, &udp_cfg); |
1649 | } else { | |
1650 | sk->sk_user_data = tunnel; | |
1651 | } | |
fd558d18 JC |
1652 | |
1653 | /* Hook on the tunnel socket destructor so that we can cleanup | |
1654 | * if the tunnel socket goes away. | |
1655 | */ | |
1656 | tunnel->old_sk_destruct = sk->sk_destruct; | |
1657 | sk->sk_destruct = &l2tp_tunnel_destruct; | |
1658 | tunnel->sock = sk; | |
80d84ef3 | 1659 | tunnel->fd = fd; |
37159ef2 ED |
1660 | lockdep_set_class_and_name(&sk->sk_lock.slock, &l2tp_socket_class, "l2tp_sock"); |
1661 | ||
fd558d18 JC |
1662 | sk->sk_allocation = GFP_ATOMIC; |
1663 | ||
f8ccac0e TP |
1664 | /* Init delete workqueue struct */ |
1665 | INIT_WORK(&tunnel->del_work, l2tp_tunnel_del_work); | |
1666 | ||
fd558d18 JC |
1667 | /* Add tunnel to our list */ |
1668 | INIT_LIST_HEAD(&tunnel->list); | |
fd558d18 JC |
1669 | atomic_inc(&l2tp_tunnel_count); |
1670 | ||
1671 | /* Bump the reference count. The tunnel context is deleted | |
1769192a | 1672 | * only when this drops to zero. Must be done before list insertion |
fd558d18 | 1673 | */ |
fbea9e07 | 1674 | refcount_set(&tunnel->ref_count, 1); |
1769192a ED |
1675 | spin_lock_bh(&pn->l2tp_tunnel_list_lock); |
1676 | list_add_rcu(&tunnel->list, &pn->l2tp_tunnel_list); | |
1677 | spin_unlock_bh(&pn->l2tp_tunnel_list_lock); | |
fd558d18 JC |
1678 | |
1679 | err = 0; | |
1680 | err: | |
1681 | if (tunnelp) | |
1682 | *tunnelp = tunnel; | |
1683 | ||
789a4a2c JC |
1684 | /* If tunnel's socket was created by the kernel, it doesn't |
1685 | * have a file. | |
1686 | */ | |
1687 | if (sock && sock->file) | |
fd558d18 JC |
1688 | sockfd_put(sock); |
1689 | ||
1690 | return err; | |
1691 | } | |
1692 | EXPORT_SYMBOL_GPL(l2tp_tunnel_create); | |
1693 | ||
309795f4 JC |
1694 | /* This function is used by the netlink TUNNEL_DELETE command. |
1695 | */ | |
62b982ee | 1696 | void l2tp_tunnel_delete(struct l2tp_tunnel *tunnel) |
309795f4 | 1697 | { |
62b982ee SD |
1698 | if (!test_and_set_bit(0, &tunnel->dead)) { |
1699 | l2tp_tunnel_inc_refcount(tunnel); | |
1700 | queue_work(l2tp_wq, &tunnel->del_work); | |
06a15f51 | 1701 | } |
309795f4 JC |
1702 | } |
1703 | EXPORT_SYMBOL_GPL(l2tp_tunnel_delete); | |
1704 | ||
fd558d18 JC |
1705 | /* Really kill the session. |
1706 | */ | |
1707 | void l2tp_session_free(struct l2tp_session *session) | |
1708 | { | |
f6e16b29 | 1709 | struct l2tp_tunnel *tunnel = session->tunnel; |
fd558d18 | 1710 | |
fbea9e07 | 1711 | BUG_ON(refcount_read(&session->ref_count) != 0); |
fd558d18 | 1712 | |
f6e16b29 | 1713 | if (tunnel) { |
fd558d18 | 1714 | BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC); |
f6e16b29 TP |
1715 | if (session->session_id != 0) |
1716 | atomic_dec(&l2tp_session_count); | |
1717 | sock_put(tunnel->sock); | |
1718 | session->tunnel = NULL; | |
1719 | l2tp_tunnel_dec_refcount(tunnel); | |
1720 | } | |
1721 | ||
1722 | kfree(session); | |
f6e16b29 TP |
1723 | } |
1724 | EXPORT_SYMBOL_GPL(l2tp_session_free); | |
1725 | ||
1726 | /* Remove an l2tp session from l2tp_core's hash lists. | |
1727 | * Provides a tidyup interface for pseudowire code which can't just route all | |
1728 | * shutdown via. l2tp_session_delete and a pseudowire-specific session_close | |
1729 | * callback. | |
1730 | */ | |
1731 | void __l2tp_session_unhash(struct l2tp_session *session) | |
1732 | { | |
1733 | struct l2tp_tunnel *tunnel = session->tunnel; | |
fd558d18 | 1734 | |
f6e16b29 TP |
1735 | /* Remove the session from core hashes */ |
1736 | if (tunnel) { | |
1737 | /* Remove from the per-tunnel hash */ | |
fd558d18 JC |
1738 | write_lock_bh(&tunnel->hlist_lock); |
1739 | hlist_del_init(&session->hlist); | |
1740 | write_unlock_bh(&tunnel->hlist_lock); | |
1741 | ||
f6e16b29 | 1742 | /* For L2TPv3 we have a per-net hash: remove from there, too */ |
f7faffa3 JC |
1743 | if (tunnel->version != L2TP_HDR_VER_2) { |
1744 | struct l2tp_net *pn = l2tp_pernet(tunnel->l2tp_net); | |
e02d494d JC |
1745 | spin_lock_bh(&pn->l2tp_session_hlist_lock); |
1746 | hlist_del_init_rcu(&session->global_hlist); | |
1747 | spin_unlock_bh(&pn->l2tp_session_hlist_lock); | |
1748 | synchronize_rcu(); | |
f7faffa3 | 1749 | } |
fd558d18 | 1750 | } |
fd558d18 | 1751 | } |
f6e16b29 | 1752 | EXPORT_SYMBOL_GPL(__l2tp_session_unhash); |
fd558d18 | 1753 | |
309795f4 JC |
1754 | /* This function is used by the netlink SESSION_DELETE command and by |
1755 | pseudowire modules. | |
1756 | */ | |
1757 | int l2tp_session_delete(struct l2tp_session *session) | |
1758 | { | |
b228a940 GN |
1759 | if (test_and_set_bit(0, &session->dead)) |
1760 | return 0; | |
1761 | ||
f6e16b29 TP |
1762 | if (session->ref) |
1763 | (*session->ref)(session); | |
1764 | __l2tp_session_unhash(session); | |
4c6e2fd3 | 1765 | l2tp_session_queue_purge(session); |
309795f4 JC |
1766 | if (session->session_close != NULL) |
1767 | (*session->session_close)(session); | |
f6e16b29 | 1768 | if (session->deref) |
1b7c92b9 | 1769 | (*session->deref)(session); |
309795f4 | 1770 | l2tp_session_dec_refcount(session); |
309795f4 JC |
1771 | return 0; |
1772 | } | |
1773 | EXPORT_SYMBOL_GPL(l2tp_session_delete); | |
1774 | ||
f7faffa3 JC |
1775 | /* We come here whenever a session's send_seq, cookie_len or |
1776 | * l2specific_len parameters are set. | |
1777 | */ | |
bb5016ea | 1778 | void l2tp_session_set_header_len(struct l2tp_session *session, int version) |
f7faffa3 JC |
1779 | { |
1780 | if (version == L2TP_HDR_VER_2) { | |
1781 | session->hdr_len = 6; | |
1782 | if (session->send_seq) | |
1783 | session->hdr_len += 4; | |
1784 | } else { | |
0d76751f JC |
1785 | session->hdr_len = 4 + session->cookie_len + session->l2specific_len + session->offset; |
1786 | if (session->tunnel->encap == L2TP_ENCAPTYPE_UDP) | |
1787 | session->hdr_len += 4; | |
f7faffa3 JC |
1788 | } |
1789 | ||
1790 | } | |
bb5016ea | 1791 | EXPORT_SYMBOL_GPL(l2tp_session_set_header_len); |
f7faffa3 | 1792 | |
fd558d18 JC |
1793 | struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunnel, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg) |
1794 | { | |
1795 | struct l2tp_session *session; | |
1796 | ||
1797 | session = kzalloc(sizeof(struct l2tp_session) + priv_size, GFP_KERNEL); | |
1798 | if (session != NULL) { | |
1799 | session->magic = L2TP_SESSION_MAGIC; | |
1800 | session->tunnel = tunnel; | |
1801 | ||
1802 | session->session_id = session_id; | |
1803 | session->peer_session_id = peer_session_id; | |
d301e325 | 1804 | session->nr = 0; |
8a1631d5 JC |
1805 | if (tunnel->version == L2TP_HDR_VER_2) |
1806 | session->nr_max = 0xffff; | |
1807 | else | |
1808 | session->nr_max = 0xffffff; | |
1809 | session->nr_window_size = session->nr_max / 2; | |
a0dbd822 JC |
1810 | session->nr_oos_count_max = 4; |
1811 | ||
1812 | /* Use NR of first received packet */ | |
1813 | session->reorder_skip = 1; | |
fd558d18 JC |
1814 | |
1815 | sprintf(&session->name[0], "sess %u/%u", | |
1816 | tunnel->tunnel_id, session->session_id); | |
1817 | ||
1818 | skb_queue_head_init(&session->reorder_q); | |
1819 | ||
1820 | INIT_HLIST_NODE(&session->hlist); | |
f7faffa3 | 1821 | INIT_HLIST_NODE(&session->global_hlist); |
fd558d18 JC |
1822 | |
1823 | /* Inherit debug options from tunnel */ | |
1824 | session->debug = tunnel->debug; | |
1825 | ||
1826 | if (cfg) { | |
f7faffa3 | 1827 | session->pwtype = cfg->pw_type; |
fd558d18 | 1828 | session->debug = cfg->debug; |
fd558d18 JC |
1829 | session->mtu = cfg->mtu; |
1830 | session->mru = cfg->mru; | |
1831 | session->send_seq = cfg->send_seq; | |
1832 | session->recv_seq = cfg->recv_seq; | |
1833 | session->lns_mode = cfg->lns_mode; | |
f7faffa3 JC |
1834 | session->reorder_timeout = cfg->reorder_timeout; |
1835 | session->offset = cfg->offset; | |
1836 | session->l2specific_type = cfg->l2specific_type; | |
1837 | session->l2specific_len = cfg->l2specific_len; | |
1838 | session->cookie_len = cfg->cookie_len; | |
1839 | memcpy(&session->cookie[0], &cfg->cookie[0], cfg->cookie_len); | |
1840 | session->peer_cookie_len = cfg->peer_cookie_len; | |
1841 | memcpy(&session->peer_cookie[0], &cfg->peer_cookie[0], cfg->peer_cookie_len); | |
fd558d18 JC |
1842 | } |
1843 | ||
f7faffa3 JC |
1844 | if (tunnel->version == L2TP_HDR_VER_2) |
1845 | session->build_header = l2tp_build_l2tpv2_header; | |
1846 | else | |
1847 | session->build_header = l2tp_build_l2tpv3_header; | |
1848 | ||
1849 | l2tp_session_set_header_len(session, tunnel->version); | |
1850 | ||
9ee369a4 GN |
1851 | refcount_set(&session->ref_count, 1); |
1852 | ||
dbdbc73b | 1853 | return session; |
fd558d18 JC |
1854 | } |
1855 | ||
dbdbc73b | 1856 | return ERR_PTR(-ENOMEM); |
fd558d18 JC |
1857 | } |
1858 | EXPORT_SYMBOL_GPL(l2tp_session_create); | |
1859 | ||
1860 | /***************************************************************************** | |
1861 | * Init and cleanup | |
1862 | *****************************************************************************/ | |
1863 | ||
1864 | static __net_init int l2tp_init_net(struct net *net) | |
1865 | { | |
e773aaff | 1866 | struct l2tp_net *pn = net_generic(net, l2tp_net_id); |
f7faffa3 | 1867 | int hash; |
fd558d18 | 1868 | |
fd558d18 | 1869 | INIT_LIST_HEAD(&pn->l2tp_tunnel_list); |
e02d494d | 1870 | spin_lock_init(&pn->l2tp_tunnel_list_lock); |
fd558d18 | 1871 | |
f7faffa3 JC |
1872 | for (hash = 0; hash < L2TP_HASH_SIZE_2; hash++) |
1873 | INIT_HLIST_HEAD(&pn->l2tp_session_hlist[hash]); | |
1874 | ||
e02d494d | 1875 | spin_lock_init(&pn->l2tp_session_hlist_lock); |
f7faffa3 | 1876 | |
fd558d18 | 1877 | return 0; |
fd558d18 JC |
1878 | } |
1879 | ||
167eb17e TP |
1880 | static __net_exit void l2tp_exit_net(struct net *net) |
1881 | { | |
1882 | struct l2tp_net *pn = l2tp_pernet(net); | |
1883 | struct l2tp_tunnel *tunnel = NULL; | |
1884 | ||
1885 | rcu_read_lock_bh(); | |
1886 | list_for_each_entry_rcu(tunnel, &pn->l2tp_tunnel_list, list) { | |
4dc12ffe | 1887 | l2tp_tunnel_delete(tunnel); |
167eb17e TP |
1888 | } |
1889 | rcu_read_unlock_bh(); | |
2f86953e SD |
1890 | |
1891 | flush_workqueue(l2tp_wq); | |
1892 | rcu_barrier(); | |
167eb17e TP |
1893 | } |
1894 | ||
fd558d18 JC |
1895 | static struct pernet_operations l2tp_net_ops = { |
1896 | .init = l2tp_init_net, | |
167eb17e | 1897 | .exit = l2tp_exit_net, |
fd558d18 JC |
1898 | .id = &l2tp_net_id, |
1899 | .size = sizeof(struct l2tp_net), | |
1900 | }; | |
1901 | ||
1902 | static int __init l2tp_init(void) | |
1903 | { | |
1904 | int rc = 0; | |
1905 | ||
1906 | rc = register_pernet_device(&l2tp_net_ops); | |
1907 | if (rc) | |
1908 | goto out; | |
1909 | ||
59ff3eb6 | 1910 | l2tp_wq = alloc_workqueue("l2tp", WQ_UNBOUND, 0); |
f8ccac0e TP |
1911 | if (!l2tp_wq) { |
1912 | pr_err("alloc_workqueue failed\n"); | |
67e04c29 | 1913 | unregister_pernet_device(&l2tp_net_ops); |
f8ccac0e TP |
1914 | rc = -ENOMEM; |
1915 | goto out; | |
1916 | } | |
1917 | ||
a4ca44fa | 1918 | pr_info("L2TP core driver, %s\n", L2TP_DRV_VERSION); |
fd558d18 JC |
1919 | |
1920 | out: | |
1921 | return rc; | |
1922 | } | |
1923 | ||
1924 | static void __exit l2tp_exit(void) | |
1925 | { | |
1926 | unregister_pernet_device(&l2tp_net_ops); | |
f8ccac0e TP |
1927 | if (l2tp_wq) { |
1928 | destroy_workqueue(l2tp_wq); | |
1929 | l2tp_wq = NULL; | |
1930 | } | |
fd558d18 JC |
1931 | } |
1932 | ||
1933 | module_init(l2tp_init); | |
1934 | module_exit(l2tp_exit); | |
1935 | ||
1936 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
1937 | MODULE_DESCRIPTION("L2TP core"); | |
1938 | MODULE_LICENSE("GPL"); | |
1939 | MODULE_VERSION(L2TP_DRV_VERSION); | |
1940 |