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3557baab JC |
1 | /***************************************************************************** |
2 | * Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets | |
3 | * | |
4 | * PPPoX --- Generic PPP encapsulation socket family | |
5 | * PPPoL2TP --- PPP over L2TP (RFC 2661) | |
6 | * | |
7 | * Version: 1.0.0 | |
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 | * License: | |
17 | * This program is free software; you can redistribute it and/or | |
18 | * modify it under the terms of the GNU General Public License | |
19 | * as published by the Free Software Foundation; either version | |
20 | * 2 of the License, or (at your option) any later version. | |
21 | * | |
22 | */ | |
23 | ||
24 | /* This driver handles only L2TP data frames; control frames are handled by a | |
25 | * userspace application. | |
26 | * | |
27 | * To send data in an L2TP session, userspace opens a PPPoL2TP socket and | |
28 | * attaches it to a bound UDP socket with local tunnel_id / session_id and | |
29 | * peer tunnel_id / session_id set. Data can then be sent or received using | |
30 | * regular socket sendmsg() / recvmsg() calls. Kernel parameters of the socket | |
31 | * can be read or modified using ioctl() or [gs]etsockopt() calls. | |
32 | * | |
33 | * When a PPPoL2TP socket is connected with local and peer session_id values | |
34 | * zero, the socket is treated as a special tunnel management socket. | |
35 | * | |
36 | * Here's example userspace code to create a socket for sending/receiving data | |
37 | * over an L2TP session:- | |
38 | * | |
39 | * struct sockaddr_pppol2tp sax; | |
40 | * int fd; | |
41 | * int session_fd; | |
42 | * | |
43 | * fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP); | |
44 | * | |
45 | * sax.sa_family = AF_PPPOX; | |
46 | * sax.sa_protocol = PX_PROTO_OL2TP; | |
47 | * sax.pppol2tp.fd = tunnel_fd; // bound UDP socket | |
48 | * sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr; | |
49 | * sax.pppol2tp.addr.sin_port = addr->sin_port; | |
50 | * sax.pppol2tp.addr.sin_family = AF_INET; | |
51 | * sax.pppol2tp.s_tunnel = tunnel_id; | |
52 | * sax.pppol2tp.s_session = session_id; | |
53 | * sax.pppol2tp.d_tunnel = peer_tunnel_id; | |
54 | * sax.pppol2tp.d_session = peer_session_id; | |
55 | * | |
56 | * session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax)); | |
57 | * | |
58 | * A pppd plugin that allows PPP traffic to be carried over L2TP using | |
59 | * this driver is available from the OpenL2TP project at | |
60 | * http://openl2tp.sourceforge.net. | |
61 | */ | |
62 | ||
63 | #include <linux/module.h> | |
3557baab JC |
64 | #include <linux/string.h> |
65 | #include <linux/list.h> | |
66 | #include <asm/uaccess.h> | |
67 | ||
68 | #include <linux/kernel.h> | |
69 | #include <linux/spinlock.h> | |
70 | #include <linux/kthread.h> | |
71 | #include <linux/sched.h> | |
72 | #include <linux/slab.h> | |
73 | #include <linux/errno.h> | |
74 | #include <linux/jiffies.h> | |
75 | ||
76 | #include <linux/netdevice.h> | |
77 | #include <linux/net.h> | |
78 | #include <linux/inetdevice.h> | |
79 | #include <linux/skbuff.h> | |
80 | #include <linux/init.h> | |
81 | #include <linux/ip.h> | |
82 | #include <linux/udp.h> | |
83 | #include <linux/if_pppox.h> | |
84 | #include <linux/if_pppol2tp.h> | |
85 | #include <net/sock.h> | |
86 | #include <linux/ppp_channel.h> | |
87 | #include <linux/ppp_defs.h> | |
88 | #include <linux/if_ppp.h> | |
89 | #include <linux/file.h> | |
90 | #include <linux/hash.h> | |
91 | #include <linux/sort.h> | |
92 | #include <linux/proc_fs.h> | |
457c4cbc | 93 | #include <net/net_namespace.h> |
3557baab JC |
94 | #include <net/dst.h> |
95 | #include <net/ip.h> | |
96 | #include <net/udp.h> | |
97 | #include <net/xfrm.h> | |
98 | ||
99 | #include <asm/byteorder.h> | |
100 | #include <asm/atomic.h> | |
101 | ||
102 | ||
103 | #define PPPOL2TP_DRV_VERSION "V1.0" | |
104 | ||
105 | /* L2TP header constants */ | |
106 | #define L2TP_HDRFLAG_T 0x8000 | |
107 | #define L2TP_HDRFLAG_L 0x4000 | |
108 | #define L2TP_HDRFLAG_S 0x0800 | |
109 | #define L2TP_HDRFLAG_O 0x0200 | |
110 | #define L2TP_HDRFLAG_P 0x0100 | |
111 | ||
112 | #define L2TP_HDR_VER_MASK 0x000F | |
113 | #define L2TP_HDR_VER 0x0002 | |
114 | ||
115 | /* Space for UDP, L2TP and PPP headers */ | |
116 | #define PPPOL2TP_HEADER_OVERHEAD 40 | |
117 | ||
118 | /* Just some random numbers */ | |
119 | #define L2TP_TUNNEL_MAGIC 0x42114DDA | |
120 | #define L2TP_SESSION_MAGIC 0x0C04EB7D | |
121 | ||
122 | #define PPPOL2TP_HASH_BITS 4 | |
123 | #define PPPOL2TP_HASH_SIZE (1 << PPPOL2TP_HASH_BITS) | |
124 | ||
125 | /* Default trace flags */ | |
126 | #define PPPOL2TP_DEFAULT_DEBUG_FLAGS 0 | |
127 | ||
128 | #define PRINTK(_mask, _type, _lvl, _fmt, args...) \ | |
129 | do { \ | |
130 | if ((_mask) & (_type)) \ | |
131 | printk(_lvl "PPPOL2TP: " _fmt, ##args); \ | |
132 | } while(0) | |
133 | ||
134 | /* Number of bytes to build transmit L2TP headers. | |
135 | * Unfortunately the size is different depending on whether sequence numbers | |
136 | * are enabled. | |
137 | */ | |
138 | #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10 | |
139 | #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6 | |
140 | ||
141 | struct pppol2tp_tunnel; | |
142 | ||
143 | /* Describes a session. It is the sk_user_data field in the PPPoL2TP | |
144 | * socket. Contains information to determine incoming packets and transmit | |
145 | * outgoing ones. | |
146 | */ | |
147 | struct pppol2tp_session | |
148 | { | |
149 | int magic; /* should be | |
150 | * L2TP_SESSION_MAGIC */ | |
151 | int owner; /* pid that opened the socket */ | |
152 | ||
153 | struct sock *sock; /* Pointer to the session | |
154 | * PPPoX socket */ | |
155 | struct sock *tunnel_sock; /* Pointer to the tunnel UDP | |
156 | * socket */ | |
157 | ||
158 | struct pppol2tp_addr tunnel_addr; /* Description of tunnel */ | |
159 | ||
160 | struct pppol2tp_tunnel *tunnel; /* back pointer to tunnel | |
161 | * context */ | |
162 | ||
163 | char name[20]; /* "sess xxxxx/yyyyy", where | |
164 | * x=tunnel_id, y=session_id */ | |
165 | int mtu; | |
166 | int mru; | |
167 | int flags; /* accessed by PPPIOCGFLAGS. | |
168 | * Unused. */ | |
169 | unsigned recv_seq:1; /* expect receive packets with | |
170 | * sequence numbers? */ | |
171 | unsigned send_seq:1; /* send packets with sequence | |
172 | * numbers? */ | |
173 | unsigned lns_mode:1; /* behave as LNS? LAC enables | |
174 | * sequence numbers under | |
175 | * control of LNS. */ | |
176 | int debug; /* bitmask of debug message | |
177 | * categories */ | |
178 | int reorder_timeout; /* configured reorder timeout | |
179 | * (in jiffies) */ | |
180 | u16 nr; /* session NR state (receive) */ | |
181 | u16 ns; /* session NR state (send) */ | |
182 | struct sk_buff_head reorder_q; /* receive reorder queue */ | |
183 | struct pppol2tp_ioc_stats stats; | |
184 | struct hlist_node hlist; /* Hash list node */ | |
185 | }; | |
186 | ||
187 | /* The sk_user_data field of the tunnel's UDP socket. It contains info to track | |
188 | * all the associated sessions so incoming packets can be sorted out | |
189 | */ | |
190 | struct pppol2tp_tunnel | |
191 | { | |
192 | int magic; /* Should be L2TP_TUNNEL_MAGIC */ | |
193 | rwlock_t hlist_lock; /* protect session_hlist */ | |
194 | struct hlist_head session_hlist[PPPOL2TP_HASH_SIZE]; | |
195 | /* hashed list of sessions, | |
196 | * hashed by id */ | |
197 | int debug; /* bitmask of debug message | |
198 | * categories */ | |
199 | char name[12]; /* "tunl xxxxx" */ | |
200 | struct pppol2tp_ioc_stats stats; | |
201 | ||
202 | void (*old_sk_destruct)(struct sock *); | |
203 | ||
204 | struct sock *sock; /* Parent socket */ | |
205 | struct list_head list; /* Keep a list of all open | |
206 | * prepared sockets */ | |
207 | ||
208 | atomic_t ref_count; | |
209 | }; | |
210 | ||
211 | /* Private data stored for received packets in the skb. | |
212 | */ | |
213 | struct pppol2tp_skb_cb { | |
214 | u16 ns; | |
215 | u16 nr; | |
216 | u16 has_seq; | |
217 | u16 length; | |
218 | unsigned long expires; | |
219 | }; | |
220 | ||
221 | #define PPPOL2TP_SKB_CB(skb) ((struct pppol2tp_skb_cb *) &skb->cb[sizeof(struct inet_skb_parm)]) | |
222 | ||
223 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
224 | static void pppol2tp_tunnel_free(struct pppol2tp_tunnel *tunnel); | |
225 | ||
226 | static atomic_t pppol2tp_tunnel_count; | |
227 | static atomic_t pppol2tp_session_count; | |
228 | static struct ppp_channel_ops pppol2tp_chan_ops = { pppol2tp_xmit , NULL }; | |
229 | static struct proto_ops pppol2tp_ops; | |
230 | static LIST_HEAD(pppol2tp_tunnel_list); | |
231 | static DEFINE_RWLOCK(pppol2tp_tunnel_list_lock); | |
232 | ||
233 | /* Helpers to obtain tunnel/session contexts from sockets. | |
234 | */ | |
235 | static inline struct pppol2tp_session *pppol2tp_sock_to_session(struct sock *sk) | |
236 | { | |
237 | struct pppol2tp_session *session; | |
238 | ||
239 | if (sk == NULL) | |
240 | return NULL; | |
241 | ||
24b95685 | 242 | sock_hold(sk); |
3557baab | 243 | session = (struct pppol2tp_session *)(sk->sk_user_data); |
24b95685 JC |
244 | if (session == NULL) { |
245 | sock_put(sk); | |
246 | goto out; | |
247 | } | |
3557baab JC |
248 | |
249 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
24b95685 | 250 | out: |
3557baab JC |
251 | return session; |
252 | } | |
253 | ||
254 | static inline struct pppol2tp_tunnel *pppol2tp_sock_to_tunnel(struct sock *sk) | |
255 | { | |
256 | struct pppol2tp_tunnel *tunnel; | |
257 | ||
258 | if (sk == NULL) | |
259 | return NULL; | |
260 | ||
24b95685 | 261 | sock_hold(sk); |
3557baab | 262 | tunnel = (struct pppol2tp_tunnel *)(sk->sk_user_data); |
24b95685 JC |
263 | if (tunnel == NULL) { |
264 | sock_put(sk); | |
265 | goto out; | |
266 | } | |
3557baab JC |
267 | |
268 | BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC); | |
24b95685 | 269 | out: |
3557baab JC |
270 | return tunnel; |
271 | } | |
272 | ||
273 | /* Tunnel reference counts. Incremented per session that is added to | |
274 | * the tunnel. | |
275 | */ | |
276 | static inline void pppol2tp_tunnel_inc_refcount(struct pppol2tp_tunnel *tunnel) | |
277 | { | |
278 | atomic_inc(&tunnel->ref_count); | |
279 | } | |
280 | ||
281 | static inline void pppol2tp_tunnel_dec_refcount(struct pppol2tp_tunnel *tunnel) | |
282 | { | |
283 | if (atomic_dec_and_test(&tunnel->ref_count)) | |
284 | pppol2tp_tunnel_free(tunnel); | |
285 | } | |
286 | ||
287 | /* Session hash list. | |
288 | * The session_id SHOULD be random according to RFC2661, but several | |
289 | * L2TP implementations (Cisco and Microsoft) use incrementing | |
290 | * session_ids. So we do a real hash on the session_id, rather than a | |
291 | * simple bitmask. | |
292 | */ | |
293 | static inline struct hlist_head * | |
294 | pppol2tp_session_id_hash(struct pppol2tp_tunnel *tunnel, u16 session_id) | |
295 | { | |
296 | unsigned long hash_val = (unsigned long) session_id; | |
297 | return &tunnel->session_hlist[hash_long(hash_val, PPPOL2TP_HASH_BITS)]; | |
298 | } | |
299 | ||
300 | /* Lookup a session by id | |
301 | */ | |
302 | static struct pppol2tp_session * | |
303 | pppol2tp_session_find(struct pppol2tp_tunnel *tunnel, u16 session_id) | |
304 | { | |
305 | struct hlist_head *session_list = | |
306 | pppol2tp_session_id_hash(tunnel, session_id); | |
307 | struct pppol2tp_session *session; | |
308 | struct hlist_node *walk; | |
309 | ||
cf3752e2 | 310 | read_lock_bh(&tunnel->hlist_lock); |
3557baab JC |
311 | hlist_for_each_entry(session, walk, session_list, hlist) { |
312 | if (session->tunnel_addr.s_session == session_id) { | |
cf3752e2 | 313 | read_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
314 | return session; |
315 | } | |
316 | } | |
cf3752e2 | 317 | read_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
318 | |
319 | return NULL; | |
320 | } | |
321 | ||
322 | /* Lookup a tunnel by id | |
323 | */ | |
324 | static struct pppol2tp_tunnel *pppol2tp_tunnel_find(u16 tunnel_id) | |
325 | { | |
326 | struct pppol2tp_tunnel *tunnel = NULL; | |
327 | ||
cf3752e2 | 328 | read_lock_bh(&pppol2tp_tunnel_list_lock); |
3557baab JC |
329 | list_for_each_entry(tunnel, &pppol2tp_tunnel_list, list) { |
330 | if (tunnel->stats.tunnel_id == tunnel_id) { | |
cf3752e2 | 331 | read_unlock_bh(&pppol2tp_tunnel_list_lock); |
3557baab JC |
332 | return tunnel; |
333 | } | |
334 | } | |
cf3752e2 | 335 | read_unlock_bh(&pppol2tp_tunnel_list_lock); |
3557baab JC |
336 | |
337 | return NULL; | |
338 | } | |
339 | ||
340 | /***************************************************************************** | |
341 | * Receive data handling | |
342 | *****************************************************************************/ | |
343 | ||
344 | /* Queue a skb in order. We come here only if the skb has an L2TP sequence | |
345 | * number. | |
346 | */ | |
347 | static void pppol2tp_recv_queue_skb(struct pppol2tp_session *session, struct sk_buff *skb) | |
348 | { | |
349 | struct sk_buff *skbp; | |
e653181d | 350 | struct sk_buff *tmp; |
3557baab JC |
351 | u16 ns = PPPOL2TP_SKB_CB(skb)->ns; |
352 | ||
cf3752e2 | 353 | spin_lock_bh(&session->reorder_q.lock); |
e653181d | 354 | skb_queue_walk_safe(&session->reorder_q, skbp, tmp) { |
3557baab | 355 | if (PPPOL2TP_SKB_CB(skbp)->ns > ns) { |
43f59c89 | 356 | __skb_queue_before(&session->reorder_q, skbp, skb); |
3557baab JC |
357 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, |
358 | "%s: pkt %hu, inserted before %hu, reorder_q len=%d\n", | |
359 | session->name, ns, PPPOL2TP_SKB_CB(skbp)->ns, | |
360 | skb_queue_len(&session->reorder_q)); | |
361 | session->stats.rx_oos_packets++; | |
362 | goto out; | |
363 | } | |
364 | } | |
365 | ||
366 | __skb_queue_tail(&session->reorder_q, skb); | |
367 | ||
368 | out: | |
cf3752e2 | 369 | spin_unlock_bh(&session->reorder_q.lock); |
3557baab JC |
370 | } |
371 | ||
372 | /* Dequeue a single skb. | |
373 | */ | |
374 | static void pppol2tp_recv_dequeue_skb(struct pppol2tp_session *session, struct sk_buff *skb) | |
375 | { | |
376 | struct pppol2tp_tunnel *tunnel = session->tunnel; | |
377 | int length = PPPOL2TP_SKB_CB(skb)->length; | |
378 | struct sock *session_sock = NULL; | |
379 | ||
e653181d | 380 | /* We're about to requeue the skb, so return resources |
3557baab JC |
381 | * to its current owner (a socket receive buffer). |
382 | */ | |
3557baab JC |
383 | skb_orphan(skb); |
384 | ||
385 | tunnel->stats.rx_packets++; | |
386 | tunnel->stats.rx_bytes += length; | |
387 | session->stats.rx_packets++; | |
388 | session->stats.rx_bytes += length; | |
389 | ||
390 | if (PPPOL2TP_SKB_CB(skb)->has_seq) { | |
391 | /* Bump our Nr */ | |
392 | session->nr++; | |
393 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, | |
394 | "%s: updated nr to %hu\n", session->name, session->nr); | |
395 | } | |
396 | ||
397 | /* If the socket is bound, send it in to PPP's input queue. Otherwise | |
398 | * queue it on the session socket. | |
399 | */ | |
400 | session_sock = session->sock; | |
401 | if (session_sock->sk_state & PPPOX_BOUND) { | |
402 | struct pppox_sock *po; | |
403 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
404 | "%s: recv %d byte data frame, passing to ppp\n", | |
405 | session->name, length); | |
406 | ||
407 | /* We need to forget all info related to the L2TP packet | |
408 | * gathered in the skb as we are going to reuse the same | |
409 | * skb for the inner packet. | |
410 | * Namely we need to: | |
411 | * - reset xfrm (IPSec) information as it applies to | |
412 | * the outer L2TP packet and not to the inner one | |
413 | * - release the dst to force a route lookup on the inner | |
414 | * IP packet since skb->dst currently points to the dst | |
415 | * of the UDP tunnel | |
416 | * - reset netfilter information as it doesn't apply | |
417 | * to the inner packet either | |
418 | */ | |
419 | secpath_reset(skb); | |
420 | dst_release(skb->dst); | |
421 | skb->dst = NULL; | |
422 | nf_reset(skb); | |
423 | ||
424 | po = pppox_sk(session_sock); | |
425 | ppp_input(&po->chan, skb); | |
426 | } else { | |
427 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO, | |
428 | "%s: socket not bound\n", session->name); | |
429 | ||
430 | /* Not bound. Nothing we can do, so discard. */ | |
431 | session->stats.rx_errors++; | |
432 | kfree_skb(skb); | |
433 | } | |
434 | ||
435 | sock_put(session->sock); | |
436 | } | |
437 | ||
438 | /* Dequeue skbs from the session's reorder_q, subject to packet order. | |
439 | * Skbs that have been in the queue for too long are simply discarded. | |
440 | */ | |
441 | static void pppol2tp_recv_dequeue(struct pppol2tp_session *session) | |
442 | { | |
443 | struct sk_buff *skb; | |
444 | struct sk_buff *tmp; | |
445 | ||
446 | /* If the pkt at the head of the queue has the nr that we | |
447 | * expect to send up next, dequeue it and any other | |
448 | * in-sequence packets behind it. | |
449 | */ | |
cf3752e2 | 450 | spin_lock_bh(&session->reorder_q.lock); |
3557baab JC |
451 | skb_queue_walk_safe(&session->reorder_q, skb, tmp) { |
452 | if (time_after(jiffies, PPPOL2TP_SKB_CB(skb)->expires)) { | |
453 | session->stats.rx_seq_discards++; | |
454 | session->stats.rx_errors++; | |
455 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, | |
456 | "%s: oos pkt %hu len %d discarded (too old), " | |
457 | "waiting for %hu, reorder_q_len=%d\n", | |
458 | session->name, PPPOL2TP_SKB_CB(skb)->ns, | |
459 | PPPOL2TP_SKB_CB(skb)->length, session->nr, | |
460 | skb_queue_len(&session->reorder_q)); | |
461 | __skb_unlink(skb, &session->reorder_q); | |
462 | kfree_skb(skb); | |
c8fff1cf | 463 | sock_put(session->sock); |
3557baab JC |
464 | continue; |
465 | } | |
466 | ||
467 | if (PPPOL2TP_SKB_CB(skb)->has_seq) { | |
468 | if (PPPOL2TP_SKB_CB(skb)->ns != session->nr) { | |
469 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, | |
470 | "%s: holding oos pkt %hu len %d, " | |
471 | "waiting for %hu, reorder_q_len=%d\n", | |
472 | session->name, PPPOL2TP_SKB_CB(skb)->ns, | |
473 | PPPOL2TP_SKB_CB(skb)->length, session->nr, | |
474 | skb_queue_len(&session->reorder_q)); | |
475 | goto out; | |
476 | } | |
477 | } | |
e653181d JC |
478 | __skb_unlink(skb, &session->reorder_q); |
479 | ||
480 | /* Process the skb. We release the queue lock while we | |
481 | * do so to let other contexts process the queue. | |
482 | */ | |
cf3752e2 | 483 | spin_unlock_bh(&session->reorder_q.lock); |
3557baab | 484 | pppol2tp_recv_dequeue_skb(session, skb); |
cf3752e2 | 485 | spin_lock_bh(&session->reorder_q.lock); |
3557baab JC |
486 | } |
487 | ||
488 | out: | |
cf3752e2 | 489 | spin_unlock_bh(&session->reorder_q.lock); |
3557baab JC |
490 | } |
491 | ||
ffcebb16 JC |
492 | static inline int pppol2tp_verify_udp_checksum(struct sock *sk, |
493 | struct sk_buff *skb) | |
494 | { | |
495 | struct udphdr *uh = udp_hdr(skb); | |
496 | u16 ulen = ntohs(uh->len); | |
497 | struct inet_sock *inet; | |
498 | __wsum psum; | |
499 | ||
500 | if (sk->sk_no_check || skb_csum_unnecessary(skb) || !uh->check) | |
501 | return 0; | |
502 | ||
503 | inet = inet_sk(sk); | |
504 | psum = csum_tcpudp_nofold(inet->saddr, inet->daddr, ulen, | |
505 | IPPROTO_UDP, 0); | |
506 | ||
507 | if ((skb->ip_summed == CHECKSUM_COMPLETE) && | |
508 | !csum_fold(csum_add(psum, skb->csum))) | |
509 | return 0; | |
510 | ||
511 | skb->csum = psum; | |
512 | ||
513 | return __skb_checksum_complete(skb); | |
514 | } | |
515 | ||
3557baab JC |
516 | /* Internal receive frame. Do the real work of receiving an L2TP data frame |
517 | * here. The skb is not on a list when we get here. | |
518 | * Returns 0 if the packet was a data packet and was successfully passed on. | |
519 | * Returns 1 if the packet was not a good data packet and could not be | |
520 | * forwarded. All such packets are passed up to userspace to deal with. | |
521 | */ | |
522 | static int pppol2tp_recv_core(struct sock *sock, struct sk_buff *skb) | |
523 | { | |
524 | struct pppol2tp_session *session = NULL; | |
525 | struct pppol2tp_tunnel *tunnel; | |
91781004 | 526 | unsigned char *ptr, *optr; |
3557baab JC |
527 | u16 hdrflags; |
528 | u16 tunnel_id, session_id; | |
529 | int length; | |
7a70e39b | 530 | int offset; |
3557baab JC |
531 | |
532 | tunnel = pppol2tp_sock_to_tunnel(sock); | |
533 | if (tunnel == NULL) | |
91781004 | 534 | goto no_tunnel; |
3557baab | 535 | |
ffcebb16 JC |
536 | if (tunnel->sock && pppol2tp_verify_udp_checksum(tunnel->sock, skb)) |
537 | goto discard_bad_csum; | |
538 | ||
7a70e39b HX |
539 | /* UDP always verifies the packet length. */ |
540 | __skb_pull(skb, sizeof(struct udphdr)); | |
541 | ||
3557baab | 542 | /* Short packet? */ |
7a70e39b | 543 | if (!pskb_may_pull(skb, 12)) { |
3557baab JC |
544 | PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_INFO, |
545 | "%s: recv short packet (len=%d)\n", tunnel->name, skb->len); | |
546 | goto error; | |
547 | } | |
548 | ||
549 | /* Point to L2TP header */ | |
91781004 | 550 | optr = ptr = skb->data; |
3557baab JC |
551 | |
552 | /* Get L2TP header flags */ | |
553 | hdrflags = ntohs(*(__be16*)ptr); | |
554 | ||
555 | /* Trace packet contents, if enabled */ | |
556 | if (tunnel->debug & PPPOL2TP_MSG_DATA) { | |
7a70e39b HX |
557 | length = min(16u, skb->len); |
558 | if (!pskb_may_pull(skb, length)) | |
559 | goto error; | |
560 | ||
3557baab JC |
561 | printk(KERN_DEBUG "%s: recv: ", tunnel->name); |
562 | ||
7a70e39b HX |
563 | offset = 0; |
564 | do { | |
565 | printk(" %02X", ptr[offset]); | |
566 | } while (++offset < length); | |
567 | ||
3557baab JC |
568 | printk("\n"); |
569 | } | |
570 | ||
571 | /* Get length of L2TP packet */ | |
7a70e39b | 572 | length = skb->len; |
3557baab JC |
573 | |
574 | /* If type is control packet, it is handled by userspace. */ | |
575 | if (hdrflags & L2TP_HDRFLAG_T) { | |
576 | PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
577 | "%s: recv control packet, len=%d\n", tunnel->name, length); | |
578 | goto error; | |
579 | } | |
580 | ||
581 | /* Skip flags */ | |
582 | ptr += 2; | |
583 | ||
584 | /* If length is present, skip it */ | |
585 | if (hdrflags & L2TP_HDRFLAG_L) | |
586 | ptr += 2; | |
587 | ||
588 | /* Extract tunnel and session ID */ | |
589 | tunnel_id = ntohs(*(__be16 *) ptr); | |
590 | ptr += 2; | |
591 | session_id = ntohs(*(__be16 *) ptr); | |
592 | ptr += 2; | |
593 | ||
594 | /* Find the session context */ | |
595 | session = pppol2tp_session_find(tunnel, session_id); | |
596 | if (!session) { | |
597 | /* Not found? Pass to userspace to deal with */ | |
598 | PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_INFO, | |
599 | "%s: no socket found (%hu/%hu). Passing up.\n", | |
600 | tunnel->name, tunnel_id, session_id); | |
601 | goto error; | |
602 | } | |
603 | sock_hold(session->sock); | |
604 | ||
605 | /* The ref count on the socket was increased by the above call since | |
606 | * we now hold a pointer to the session. Take care to do sock_put() | |
607 | * when exiting this function from now on... | |
608 | */ | |
609 | ||
610 | /* Handle the optional sequence numbers. If we are the LAC, | |
611 | * enable/disable sequence numbers under the control of the LNS. If | |
612 | * no sequence numbers present but we were expecting them, discard | |
613 | * frame. | |
614 | */ | |
615 | if (hdrflags & L2TP_HDRFLAG_S) { | |
616 | u16 ns, nr; | |
617 | ns = ntohs(*(__be16 *) ptr); | |
618 | ptr += 2; | |
619 | nr = ntohs(*(__be16 *) ptr); | |
620 | ptr += 2; | |
621 | ||
622 | /* Received a packet with sequence numbers. If we're the LNS, | |
623 | * check if we sre sending sequence numbers and if not, | |
624 | * configure it so. | |
625 | */ | |
626 | if ((!session->lns_mode) && (!session->send_seq)) { | |
627 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_INFO, | |
628 | "%s: requested to enable seq numbers by LNS\n", | |
629 | session->name); | |
630 | session->send_seq = -1; | |
631 | } | |
632 | ||
633 | /* Store L2TP info in the skb */ | |
634 | PPPOL2TP_SKB_CB(skb)->ns = ns; | |
635 | PPPOL2TP_SKB_CB(skb)->nr = nr; | |
636 | PPPOL2TP_SKB_CB(skb)->has_seq = 1; | |
637 | ||
638 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, | |
639 | "%s: recv data ns=%hu, nr=%hu, session nr=%hu\n", | |
640 | session->name, ns, nr, session->nr); | |
641 | } else { | |
642 | /* No sequence numbers. | |
643 | * If user has configured mandatory sequence numbers, discard. | |
644 | */ | |
645 | if (session->recv_seq) { | |
646 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_WARNING, | |
647 | "%s: recv data has no seq numbers when required. " | |
648 | "Discarding\n", session->name); | |
649 | session->stats.rx_seq_discards++; | |
3557baab JC |
650 | goto discard; |
651 | } | |
652 | ||
653 | /* If we're the LAC and we're sending sequence numbers, the | |
654 | * LNS has requested that we no longer send sequence numbers. | |
655 | * If we're the LNS and we're sending sequence numbers, the | |
656 | * LAC is broken. Discard the frame. | |
657 | */ | |
658 | if ((!session->lns_mode) && (session->send_seq)) { | |
659 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_INFO, | |
660 | "%s: requested to disable seq numbers by LNS\n", | |
661 | session->name); | |
662 | session->send_seq = 0; | |
663 | } else if (session->send_seq) { | |
664 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_WARNING, | |
665 | "%s: recv data has no seq numbers when required. " | |
666 | "Discarding\n", session->name); | |
667 | session->stats.rx_seq_discards++; | |
3557baab JC |
668 | goto discard; |
669 | } | |
670 | ||
671 | /* Store L2TP info in the skb */ | |
672 | PPPOL2TP_SKB_CB(skb)->has_seq = 0; | |
673 | } | |
674 | ||
675 | /* If offset bit set, skip it. */ | |
7a70e39b HX |
676 | if (hdrflags & L2TP_HDRFLAG_O) { |
677 | offset = ntohs(*(__be16 *)ptr); | |
91781004 | 678 | ptr += 2 + offset; |
7a70e39b | 679 | } |
3557baab | 680 | |
91781004 JC |
681 | offset = ptr - optr; |
682 | if (!pskb_may_pull(skb, offset)) | |
683 | goto discard; | |
684 | ||
685 | __skb_pull(skb, offset); | |
3557baab JC |
686 | |
687 | /* Skip PPP header, if present. In testing, Microsoft L2TP clients | |
688 | * don't send the PPP header (PPP header compression enabled), but | |
689 | * other clients can include the header. So we cope with both cases | |
690 | * here. The PPP header is always FF03 when using L2TP. | |
691 | * | |
692 | * Note that skb->data[] isn't dereferenced from a u16 ptr here since | |
693 | * the field may be unaligned. | |
694 | */ | |
91781004 JC |
695 | if (!pskb_may_pull(skb, 2)) |
696 | goto discard; | |
697 | ||
3557baab JC |
698 | if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03)) |
699 | skb_pull(skb, 2); | |
700 | ||
701 | /* Prepare skb for adding to the session's reorder_q. Hold | |
702 | * packets for max reorder_timeout or 1 second if not | |
703 | * reordering. | |
704 | */ | |
705 | PPPOL2TP_SKB_CB(skb)->length = length; | |
706 | PPPOL2TP_SKB_CB(skb)->expires = jiffies + | |
707 | (session->reorder_timeout ? session->reorder_timeout : HZ); | |
708 | ||
709 | /* Add packet to the session's receive queue. Reordering is done here, if | |
710 | * enabled. Saved L2TP protocol info is stored in skb->sb[]. | |
711 | */ | |
712 | if (PPPOL2TP_SKB_CB(skb)->has_seq) { | |
713 | if (session->reorder_timeout != 0) { | |
714 | /* Packet reordering enabled. Add skb to session's | |
715 | * reorder queue, in order of ns. | |
716 | */ | |
717 | pppol2tp_recv_queue_skb(session, skb); | |
718 | } else { | |
719 | /* Packet reordering disabled. Discard out-of-sequence | |
720 | * packets | |
721 | */ | |
722 | if (PPPOL2TP_SKB_CB(skb)->ns != session->nr) { | |
723 | session->stats.rx_seq_discards++; | |
3557baab JC |
724 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, |
725 | "%s: oos pkt %hu len %d discarded, " | |
726 | "waiting for %hu, reorder_q_len=%d\n", | |
727 | session->name, PPPOL2TP_SKB_CB(skb)->ns, | |
728 | PPPOL2TP_SKB_CB(skb)->length, session->nr, | |
729 | skb_queue_len(&session->reorder_q)); | |
730 | goto discard; | |
731 | } | |
732 | skb_queue_tail(&session->reorder_q, skb); | |
733 | } | |
734 | } else { | |
735 | /* No sequence numbers. Add the skb to the tail of the | |
736 | * reorder queue. This ensures that it will be | |
737 | * delivered after all previous sequenced skbs. | |
738 | */ | |
739 | skb_queue_tail(&session->reorder_q, skb); | |
740 | } | |
741 | ||
742 | /* Try to dequeue as many skbs from reorder_q as we can. */ | |
743 | pppol2tp_recv_dequeue(session); | |
744 | ||
745 | return 0; | |
746 | ||
747 | discard: | |
7a70e39b | 748 | session->stats.rx_errors++; |
3557baab JC |
749 | kfree_skb(skb); |
750 | sock_put(session->sock); | |
24b95685 | 751 | sock_put(sock); |
3557baab JC |
752 | |
753 | return 0; | |
754 | ||
ffcebb16 JC |
755 | discard_bad_csum: |
756 | LIMIT_NETDEBUG("%s: UDP: bad checksum\n", tunnel->name); | |
757 | UDP_INC_STATS_USER(&init_net, UDP_MIB_INERRORS, 0); | |
758 | tunnel->stats.rx_errors++; | |
759 | kfree_skb(skb); | |
760 | ||
761 | return 0; | |
762 | ||
3557baab | 763 | error: |
91781004 JC |
764 | /* Put UDP header back */ |
765 | __skb_push(skb, sizeof(struct udphdr)); | |
24b95685 | 766 | sock_put(sock); |
91781004 JC |
767 | |
768 | no_tunnel: | |
3557baab JC |
769 | return 1; |
770 | } | |
771 | ||
772 | /* UDP encapsulation receive handler. See net/ipv4/udp.c. | |
773 | * Return codes: | |
774 | * 0 : success. | |
775 | * <0: error | |
776 | * >0: skb should be passed up to userspace as UDP. | |
777 | */ | |
778 | static int pppol2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
779 | { | |
780 | struct pppol2tp_tunnel *tunnel; | |
781 | ||
782 | tunnel = pppol2tp_sock_to_tunnel(sk); | |
783 | if (tunnel == NULL) | |
784 | goto pass_up; | |
785 | ||
786 | PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
787 | "%s: received %d bytes\n", tunnel->name, skb->len); | |
788 | ||
789 | if (pppol2tp_recv_core(sk, skb)) | |
24b95685 | 790 | goto pass_up_put; |
3557baab | 791 | |
24b95685 | 792 | sock_put(sk); |
3557baab JC |
793 | return 0; |
794 | ||
24b95685 JC |
795 | pass_up_put: |
796 | sock_put(sk); | |
3557baab JC |
797 | pass_up: |
798 | return 1; | |
799 | } | |
800 | ||
801 | /* Receive message. This is the recvmsg for the PPPoL2TP socket. | |
802 | */ | |
803 | static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock, | |
804 | struct msghdr *msg, size_t len, | |
805 | int flags) | |
806 | { | |
807 | int err; | |
808 | struct sk_buff *skb; | |
809 | struct sock *sk = sock->sk; | |
810 | ||
811 | err = -EIO; | |
812 | if (sk->sk_state & PPPOX_BOUND) | |
813 | goto end; | |
814 | ||
815 | msg->msg_namelen = 0; | |
816 | ||
817 | err = 0; | |
818 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
819 | flags & MSG_DONTWAIT, &err); | |
6b6707a5 JC |
820 | if (!skb) |
821 | goto end; | |
822 | ||
823 | if (len > skb->len) | |
824 | len = skb->len; | |
825 | else if (len < skb->len) | |
826 | msg->msg_flags |= MSG_TRUNC; | |
827 | ||
828 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len); | |
829 | if (likely(err == 0)) | |
830 | err = len; | |
831 | ||
3557baab JC |
832 | kfree_skb(skb); |
833 | end: | |
834 | return err; | |
835 | } | |
836 | ||
837 | /************************************************************************ | |
838 | * Transmit handling | |
839 | ***********************************************************************/ | |
840 | ||
841 | /* Tell how big L2TP headers are for a particular session. This | |
842 | * depends on whether sequence numbers are being used. | |
843 | */ | |
844 | static inline int pppol2tp_l2tp_header_len(struct pppol2tp_session *session) | |
845 | { | |
846 | if (session->send_seq) | |
847 | return PPPOL2TP_L2TP_HDR_SIZE_SEQ; | |
848 | ||
849 | return PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
850 | } | |
851 | ||
852 | /* Build an L2TP header for the session into the buffer provided. | |
853 | */ | |
854 | static void pppol2tp_build_l2tp_header(struct pppol2tp_session *session, | |
855 | void *buf) | |
856 | { | |
857 | __be16 *bufp = buf; | |
858 | u16 flags = L2TP_HDR_VER; | |
859 | ||
860 | if (session->send_seq) | |
861 | flags |= L2TP_HDRFLAG_S; | |
862 | ||
863 | /* Setup L2TP header. | |
864 | * FIXME: Can this ever be unaligned? Is direct dereferencing of | |
865 | * 16-bit header fields safe here for all architectures? | |
866 | */ | |
867 | *bufp++ = htons(flags); | |
868 | *bufp++ = htons(session->tunnel_addr.d_tunnel); | |
869 | *bufp++ = htons(session->tunnel_addr.d_session); | |
870 | if (session->send_seq) { | |
871 | *bufp++ = htons(session->ns); | |
872 | *bufp++ = 0; | |
873 | session->ns++; | |
874 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, | |
875 | "%s: updated ns to %hu\n", session->name, session->ns); | |
876 | } | |
877 | } | |
878 | ||
879 | /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here | |
880 | * when a user application does a sendmsg() on the session socket. L2TP and | |
881 | * PPP headers must be inserted into the user's data. | |
882 | */ | |
883 | static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
884 | size_t total_len) | |
885 | { | |
886 | static const unsigned char ppph[2] = { 0xff, 0x03 }; | |
887 | struct sock *sk = sock->sk; | |
888 | struct inet_sock *inet; | |
ffcebb16 | 889 | __wsum csum; |
3557baab JC |
890 | struct sk_buff *skb; |
891 | int error; | |
892 | int hdr_len; | |
893 | struct pppol2tp_session *session; | |
894 | struct pppol2tp_tunnel *tunnel; | |
895 | struct udphdr *uh; | |
7d4372b5 | 896 | unsigned int len; |
ffcebb16 JC |
897 | struct sock *sk_tun; |
898 | u16 udp_len; | |
3557baab JC |
899 | |
900 | error = -ENOTCONN; | |
901 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
902 | goto error; | |
903 | ||
904 | /* Get session and tunnel contexts */ | |
905 | error = -EBADF; | |
906 | session = pppol2tp_sock_to_session(sk); | |
907 | if (session == NULL) | |
908 | goto error; | |
909 | ||
ffcebb16 JC |
910 | sk_tun = session->tunnel_sock; |
911 | tunnel = pppol2tp_sock_to_tunnel(sk_tun); | |
3557baab | 912 | if (tunnel == NULL) |
24b95685 | 913 | goto error_put_sess; |
3557baab JC |
914 | |
915 | /* What header length is configured for this session? */ | |
916 | hdr_len = pppol2tp_l2tp_header_len(session); | |
917 | ||
918 | /* Allocate a socket buffer */ | |
919 | error = -ENOMEM; | |
920 | skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + | |
921 | sizeof(struct udphdr) + hdr_len + | |
922 | sizeof(ppph) + total_len, | |
923 | 0, GFP_KERNEL); | |
924 | if (!skb) | |
24b95685 | 925 | goto error_put_sess_tun; |
3557baab JC |
926 | |
927 | /* Reserve space for headers. */ | |
928 | skb_reserve(skb, NET_SKB_PAD); | |
929 | skb_reset_network_header(skb); | |
930 | skb_reserve(skb, sizeof(struct iphdr)); | |
931 | skb_reset_transport_header(skb); | |
932 | ||
933 | /* Build UDP header */ | |
ffcebb16 JC |
934 | inet = inet_sk(sk_tun); |
935 | udp_len = hdr_len + sizeof(ppph) + total_len; | |
3557baab JC |
936 | uh = (struct udphdr *) skb->data; |
937 | uh->source = inet->sport; | |
938 | uh->dest = inet->dport; | |
ffcebb16 | 939 | uh->len = htons(udp_len); |
3557baab JC |
940 | uh->check = 0; |
941 | skb_put(skb, sizeof(struct udphdr)); | |
942 | ||
943 | /* Build L2TP header */ | |
944 | pppol2tp_build_l2tp_header(session, skb->data); | |
945 | skb_put(skb, hdr_len); | |
946 | ||
947 | /* Add PPP header */ | |
948 | skb->data[0] = ppph[0]; | |
949 | skb->data[1] = ppph[1]; | |
950 | skb_put(skb, 2); | |
951 | ||
952 | /* Copy user data into skb */ | |
953 | error = memcpy_fromiovec(skb->data, m->msg_iov, total_len); | |
954 | if (error < 0) { | |
955 | kfree_skb(skb); | |
24b95685 | 956 | goto error_put_sess_tun; |
3557baab JC |
957 | } |
958 | skb_put(skb, total_len); | |
959 | ||
960 | /* Calculate UDP checksum if configured to do so */ | |
ffcebb16 JC |
961 | if (sk_tun->sk_no_check == UDP_CSUM_NOXMIT) |
962 | skb->ip_summed = CHECKSUM_NONE; | |
963 | else if (!(skb->dst->dev->features & NETIF_F_V4_CSUM)) { | |
964 | skb->ip_summed = CHECKSUM_COMPLETE; | |
965 | csum = skb_checksum(skb, 0, udp_len, 0); | |
966 | uh->check = csum_tcpudp_magic(inet->saddr, inet->daddr, | |
967 | udp_len, IPPROTO_UDP, csum); | |
968 | if (uh->check == 0) | |
969 | uh->check = CSUM_MANGLED_0; | |
970 | } else { | |
971 | skb->ip_summed = CHECKSUM_PARTIAL; | |
972 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
973 | skb->csum_offset = offsetof(struct udphdr, check); | |
974 | uh->check = ~csum_tcpudp_magic(inet->saddr, inet->daddr, | |
975 | udp_len, IPPROTO_UDP, 0); | |
976 | } | |
3557baab JC |
977 | |
978 | /* Debug */ | |
979 | if (session->send_seq) | |
980 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
38d15b65 | 981 | "%s: send %Zd bytes, ns=%hu\n", session->name, |
3557baab JC |
982 | total_len, session->ns - 1); |
983 | else | |
984 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
38d15b65 | 985 | "%s: send %Zd bytes\n", session->name, total_len); |
3557baab JC |
986 | |
987 | if (session->debug & PPPOL2TP_MSG_DATA) { | |
988 | int i; | |
989 | unsigned char *datap = skb->data; | |
990 | ||
991 | printk(KERN_DEBUG "%s: xmit:", session->name); | |
992 | for (i = 0; i < total_len; i++) { | |
993 | printk(" %02X", *datap++); | |
994 | if (i == 15) { | |
995 | printk(" ..."); | |
996 | break; | |
997 | } | |
998 | } | |
999 | printk("\n"); | |
1000 | } | |
1001 | ||
1002 | /* Queue the packet to IP for output */ | |
7d4372b5 | 1003 | len = skb->len; |
3557baab JC |
1004 | error = ip_queue_xmit(skb, 1); |
1005 | ||
1006 | /* Update stats */ | |
1007 | if (error >= 0) { | |
1008 | tunnel->stats.tx_packets++; | |
7d4372b5 | 1009 | tunnel->stats.tx_bytes += len; |
3557baab | 1010 | session->stats.tx_packets++; |
7d4372b5 | 1011 | session->stats.tx_bytes += len; |
3557baab JC |
1012 | } else { |
1013 | tunnel->stats.tx_errors++; | |
1014 | session->stats.tx_errors++; | |
1015 | } | |
1016 | ||
24b95685 JC |
1017 | return error; |
1018 | ||
1019 | error_put_sess_tun: | |
1020 | sock_put(session->tunnel_sock); | |
1021 | error_put_sess: | |
1022 | sock_put(sk); | |
3557baab JC |
1023 | error: |
1024 | return error; | |
1025 | } | |
1026 | ||
24b95685 JC |
1027 | /* Automatically called when the skb is freed. |
1028 | */ | |
1029 | static void pppol2tp_sock_wfree(struct sk_buff *skb) | |
1030 | { | |
1031 | sock_put(skb->sk); | |
1032 | } | |
1033 | ||
1034 | /* For data skbs that we transmit, we associate with the tunnel socket | |
1035 | * but don't do accounting. | |
1036 | */ | |
1037 | static inline void pppol2tp_skb_set_owner_w(struct sk_buff *skb, struct sock *sk) | |
1038 | { | |
1039 | sock_hold(sk); | |
1040 | skb->sk = sk; | |
1041 | skb->destructor = pppol2tp_sock_wfree; | |
1042 | } | |
1043 | ||
3557baab JC |
1044 | /* Transmit function called by generic PPP driver. Sends PPP frame |
1045 | * over PPPoL2TP socket. | |
1046 | * | |
1047 | * This is almost the same as pppol2tp_sendmsg(), but rather than | |
1048 | * being called with a msghdr from userspace, it is called with a skb | |
1049 | * from the kernel. | |
1050 | * | |
1051 | * The supplied skb from ppp doesn't have enough headroom for the | |
1052 | * insertion of L2TP, UDP and IP headers so we need to allocate more | |
1053 | * headroom in the skb. This will create a cloned skb. But we must be | |
1054 | * careful in the error case because the caller will expect to free | |
1055 | * the skb it supplied, not our cloned skb. So we take care to always | |
1056 | * leave the original skb unfreed if we return an error. | |
1057 | */ | |
1058 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
1059 | { | |
1060 | static const u8 ppph[2] = { 0xff, 0x03 }; | |
1061 | struct sock *sk = (struct sock *) chan->private; | |
1062 | struct sock *sk_tun; | |
1063 | int hdr_len; | |
ffcebb16 | 1064 | u16 udp_len; |
3557baab JC |
1065 | struct pppol2tp_session *session; |
1066 | struct pppol2tp_tunnel *tunnel; | |
1067 | int rc; | |
1068 | int headroom; | |
1069 | int data_len = skb->len; | |
1070 | struct inet_sock *inet; | |
ffcebb16 | 1071 | __wsum csum; |
3557baab | 1072 | struct udphdr *uh; |
7d4372b5 | 1073 | unsigned int len; |
090c48d3 JC |
1074 | int old_headroom; |
1075 | int new_headroom; | |
3557baab JC |
1076 | |
1077 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
1078 | goto abort; | |
1079 | ||
1080 | /* Get session and tunnel contexts from the socket */ | |
1081 | session = pppol2tp_sock_to_session(sk); | |
1082 | if (session == NULL) | |
1083 | goto abort; | |
1084 | ||
1085 | sk_tun = session->tunnel_sock; | |
1086 | if (sk_tun == NULL) | |
24b95685 | 1087 | goto abort_put_sess; |
3557baab JC |
1088 | tunnel = pppol2tp_sock_to_tunnel(sk_tun); |
1089 | if (tunnel == NULL) | |
24b95685 | 1090 | goto abort_put_sess; |
3557baab JC |
1091 | |
1092 | /* What header length is configured for this session? */ | |
1093 | hdr_len = pppol2tp_l2tp_header_len(session); | |
1094 | ||
1095 | /* Check that there's enough headroom in the skb to insert IP, | |
1096 | * UDP and L2TP and PPP headers. If not enough, expand it to | |
090c48d3 | 1097 | * make room. Adjust truesize. |
3557baab JC |
1098 | */ |
1099 | headroom = NET_SKB_PAD + sizeof(struct iphdr) + | |
1100 | sizeof(struct udphdr) + hdr_len + sizeof(ppph); | |
090c48d3 | 1101 | old_headroom = skb_headroom(skb); |
f3d5e3a4 | 1102 | if (skb_cow_head(skb, headroom)) |
24b95685 | 1103 | goto abort_put_sess_tun; |
3557baab | 1104 | |
090c48d3 JC |
1105 | new_headroom = skb_headroom(skb); |
1106 | skb_orphan(skb); | |
1107 | skb->truesize += new_headroom - old_headroom; | |
1108 | ||
3557baab | 1109 | /* Setup PPP header */ |
f3d5e3a4 HX |
1110 | __skb_push(skb, sizeof(ppph)); |
1111 | skb->data[0] = ppph[0]; | |
1112 | skb->data[1] = ppph[1]; | |
3557baab JC |
1113 | |
1114 | /* Setup L2TP header */ | |
f3d5e3a4 | 1115 | pppol2tp_build_l2tp_header(session, __skb_push(skb, hdr_len)); |
3557baab | 1116 | |
ffcebb16 JC |
1117 | udp_len = sizeof(struct udphdr) + hdr_len + sizeof(ppph) + data_len; |
1118 | ||
3557baab JC |
1119 | /* Setup UDP header */ |
1120 | inet = inet_sk(sk_tun); | |
f3d5e3a4 HX |
1121 | __skb_push(skb, sizeof(*uh)); |
1122 | skb_reset_transport_header(skb); | |
1123 | uh = udp_hdr(skb); | |
3557baab JC |
1124 | uh->source = inet->sport; |
1125 | uh->dest = inet->dport; | |
ffcebb16 | 1126 | uh->len = htons(udp_len); |
3557baab JC |
1127 | uh->check = 0; |
1128 | ||
3557baab JC |
1129 | /* Debug */ |
1130 | if (session->send_seq) | |
1131 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
1132 | "%s: send %d bytes, ns=%hu\n", session->name, | |
1133 | data_len, session->ns - 1); | |
1134 | else | |
1135 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
1136 | "%s: send %d bytes\n", session->name, data_len); | |
1137 | ||
1138 | if (session->debug & PPPOL2TP_MSG_DATA) { | |
1139 | int i; | |
f3d5e3a4 | 1140 | unsigned char *datap = skb->data; |
3557baab JC |
1141 | |
1142 | printk(KERN_DEBUG "%s: xmit:", session->name); | |
1143 | for (i = 0; i < data_len; i++) { | |
1144 | printk(" %02X", *datap++); | |
1145 | if (i == 31) { | |
1146 | printk(" ..."); | |
1147 | break; | |
1148 | } | |
1149 | } | |
1150 | printk("\n"); | |
1151 | } | |
1152 | ||
f3d5e3a4 HX |
1153 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1154 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | | |
1155 | IPSKB_REROUTED); | |
1156 | nf_reset(skb); | |
f77ae939 | 1157 | |
3557baab | 1158 | /* Get routing info from the tunnel socket */ |
f3d5e3a4 | 1159 | dst_release(skb->dst); |
cf3752e2 | 1160 | skb->dst = dst_clone(__sk_dst_get(sk_tun)); |
24b95685 | 1161 | pppol2tp_skb_set_owner_w(skb, sk_tun); |
3557baab | 1162 | |
ffcebb16 JC |
1163 | /* Calculate UDP checksum if configured to do so */ |
1164 | if (sk_tun->sk_no_check == UDP_CSUM_NOXMIT) | |
1165 | skb->ip_summed = CHECKSUM_NONE; | |
1166 | else if (!(skb->dst->dev->features & NETIF_F_V4_CSUM)) { | |
1167 | skb->ip_summed = CHECKSUM_COMPLETE; | |
1168 | csum = skb_checksum(skb, 0, udp_len, 0); | |
1169 | uh->check = csum_tcpudp_magic(inet->saddr, inet->daddr, | |
1170 | udp_len, IPPROTO_UDP, csum); | |
1171 | if (uh->check == 0) | |
1172 | uh->check = CSUM_MANGLED_0; | |
1173 | } else { | |
1174 | skb->ip_summed = CHECKSUM_PARTIAL; | |
1175 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1176 | skb->csum_offset = offsetof(struct udphdr, check); | |
1177 | uh->check = ~csum_tcpudp_magic(inet->saddr, inet->daddr, | |
1178 | udp_len, IPPROTO_UDP, 0); | |
1179 | } | |
1180 | ||
3557baab | 1181 | /* Queue the packet to IP for output */ |
f3d5e3a4 HX |
1182 | len = skb->len; |
1183 | rc = ip_queue_xmit(skb, 1); | |
3557baab JC |
1184 | |
1185 | /* Update stats */ | |
1186 | if (rc >= 0) { | |
1187 | tunnel->stats.tx_packets++; | |
7d4372b5 | 1188 | tunnel->stats.tx_bytes += len; |
3557baab | 1189 | session->stats.tx_packets++; |
7d4372b5 | 1190 | session->stats.tx_bytes += len; |
3557baab JC |
1191 | } else { |
1192 | tunnel->stats.tx_errors++; | |
1193 | session->stats.tx_errors++; | |
1194 | } | |
1195 | ||
24b95685 JC |
1196 | sock_put(sk_tun); |
1197 | sock_put(sk); | |
3557baab JC |
1198 | return 1; |
1199 | ||
24b95685 JC |
1200 | abort_put_sess_tun: |
1201 | sock_put(sk_tun); | |
1202 | abort_put_sess: | |
1203 | sock_put(sk); | |
3557baab | 1204 | abort: |
f3d5e3a4 HX |
1205 | /* Free the original skb */ |
1206 | kfree_skb(skb); | |
1207 | return 1; | |
3557baab JC |
1208 | } |
1209 | ||
1210 | /***************************************************************************** | |
1211 | * Session (and tunnel control) socket create/destroy. | |
1212 | *****************************************************************************/ | |
1213 | ||
1214 | /* When the tunnel UDP socket is closed, all the attached sockets need to go | |
1215 | * too. | |
1216 | */ | |
1217 | static void pppol2tp_tunnel_closeall(struct pppol2tp_tunnel *tunnel) | |
1218 | { | |
1219 | int hash; | |
1220 | struct hlist_node *walk; | |
1221 | struct hlist_node *tmp; | |
1222 | struct pppol2tp_session *session; | |
1223 | struct sock *sk; | |
1224 | ||
1225 | if (tunnel == NULL) | |
1226 | BUG(); | |
1227 | ||
1228 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1229 | "%s: closing all sessions...\n", tunnel->name); | |
1230 | ||
cf3752e2 | 1231 | write_lock_bh(&tunnel->hlist_lock); |
3557baab JC |
1232 | for (hash = 0; hash < PPPOL2TP_HASH_SIZE; hash++) { |
1233 | again: | |
1234 | hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) { | |
ec9b6add JP |
1235 | struct sk_buff *skb; |
1236 | ||
3557baab JC |
1237 | session = hlist_entry(walk, struct pppol2tp_session, hlist); |
1238 | ||
1239 | sk = session->sock; | |
1240 | ||
1241 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1242 | "%s: closing session\n", session->name); | |
1243 | ||
1244 | hlist_del_init(&session->hlist); | |
1245 | ||
1246 | /* Since we should hold the sock lock while | |
1247 | * doing any unbinding, we need to release the | |
1248 | * lock we're holding before taking that lock. | |
1249 | * Hold a reference to the sock so it doesn't | |
1250 | * disappear as we're jumping between locks. | |
1251 | */ | |
1252 | sock_hold(sk); | |
cf3752e2 | 1253 | write_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
1254 | lock_sock(sk); |
1255 | ||
1256 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { | |
1257 | pppox_unbind_sock(sk); | |
1258 | sk->sk_state = PPPOX_DEAD; | |
1259 | sk->sk_state_change(sk); | |
1260 | } | |
1261 | ||
1262 | /* Purge any queued data */ | |
1263 | skb_queue_purge(&sk->sk_receive_queue); | |
1264 | skb_queue_purge(&sk->sk_write_queue); | |
ec9b6add JP |
1265 | while ((skb = skb_dequeue(&session->reorder_q))) { |
1266 | kfree_skb(skb); | |
1267 | sock_put(sk); | |
1268 | } | |
3557baab JC |
1269 | |
1270 | release_sock(sk); | |
1271 | sock_put(sk); | |
1272 | ||
1273 | /* Now restart from the beginning of this hash | |
1274 | * chain. We always remove a session from the | |
1275 | * list so we are guaranteed to make forward | |
1276 | * progress. | |
1277 | */ | |
cf3752e2 | 1278 | write_lock_bh(&tunnel->hlist_lock); |
3557baab JC |
1279 | goto again; |
1280 | } | |
1281 | } | |
cf3752e2 | 1282 | write_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
1283 | } |
1284 | ||
1285 | /* Really kill the tunnel. | |
1286 | * Come here only when all sessions have been cleared from the tunnel. | |
1287 | */ | |
1288 | static void pppol2tp_tunnel_free(struct pppol2tp_tunnel *tunnel) | |
1289 | { | |
1290 | /* Remove from socket list */ | |
cf3752e2 | 1291 | write_lock_bh(&pppol2tp_tunnel_list_lock); |
3557baab | 1292 | list_del_init(&tunnel->list); |
cf3752e2 | 1293 | write_unlock_bh(&pppol2tp_tunnel_list_lock); |
3557baab JC |
1294 | |
1295 | atomic_dec(&pppol2tp_tunnel_count); | |
1296 | kfree(tunnel); | |
1297 | } | |
1298 | ||
1299 | /* Tunnel UDP socket destruct hook. | |
1300 | * The tunnel context is deleted only when all session sockets have been | |
1301 | * closed. | |
1302 | */ | |
1303 | static void pppol2tp_tunnel_destruct(struct sock *sk) | |
1304 | { | |
1305 | struct pppol2tp_tunnel *tunnel; | |
1306 | ||
24b95685 | 1307 | tunnel = sk->sk_user_data; |
3557baab JC |
1308 | if (tunnel == NULL) |
1309 | goto end; | |
1310 | ||
1311 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1312 | "%s: closing...\n", tunnel->name); | |
1313 | ||
1314 | /* Close all sessions */ | |
1315 | pppol2tp_tunnel_closeall(tunnel); | |
1316 | ||
1317 | /* No longer an encapsulation socket. See net/ipv4/udp.c */ | |
1318 | (udp_sk(sk))->encap_type = 0; | |
1319 | (udp_sk(sk))->encap_rcv = NULL; | |
1320 | ||
1321 | /* Remove hooks into tunnel socket */ | |
1322 | tunnel->sock = NULL; | |
1323 | sk->sk_destruct = tunnel->old_sk_destruct; | |
1324 | sk->sk_user_data = NULL; | |
1325 | ||
1326 | /* Call original (UDP) socket descructor */ | |
1327 | if (sk->sk_destruct != NULL) | |
1328 | (*sk->sk_destruct)(sk); | |
1329 | ||
1330 | pppol2tp_tunnel_dec_refcount(tunnel); | |
1331 | ||
1332 | end: | |
1333 | return; | |
1334 | } | |
1335 | ||
1336 | /* Really kill the session socket. (Called from sock_put() if | |
1337 | * refcnt == 0.) | |
1338 | */ | |
1339 | static void pppol2tp_session_destruct(struct sock *sk) | |
1340 | { | |
1341 | struct pppol2tp_session *session = NULL; | |
1342 | ||
1343 | if (sk->sk_user_data != NULL) { | |
1344 | struct pppol2tp_tunnel *tunnel; | |
1345 | ||
24b95685 | 1346 | session = sk->sk_user_data; |
3557baab JC |
1347 | if (session == NULL) |
1348 | goto out; | |
1349 | ||
24b95685 JC |
1350 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); |
1351 | ||
3557baab JC |
1352 | /* Don't use pppol2tp_sock_to_tunnel() here to |
1353 | * get the tunnel context because the tunnel | |
1354 | * socket might have already been closed (its | |
1355 | * sk->sk_user_data will be NULL) so use the | |
1356 | * session's private tunnel ptr instead. | |
1357 | */ | |
1358 | tunnel = session->tunnel; | |
1359 | if (tunnel != NULL) { | |
1360 | BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC); | |
1361 | ||
1362 | /* If session_id is zero, this is a null | |
1363 | * session context, which was created for a | |
1364 | * socket that is being used only to manage | |
1365 | * tunnels. | |
1366 | */ | |
1367 | if (session->tunnel_addr.s_session != 0) { | |
1368 | /* Delete the session socket from the | |
1369 | * hash | |
1370 | */ | |
cf3752e2 | 1371 | write_lock_bh(&tunnel->hlist_lock); |
3557baab | 1372 | hlist_del_init(&session->hlist); |
cf3752e2 | 1373 | write_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
1374 | |
1375 | atomic_dec(&pppol2tp_session_count); | |
1376 | } | |
1377 | ||
1378 | /* This will delete the tunnel context if this | |
1379 | * is the last session on the tunnel. | |
1380 | */ | |
1381 | session->tunnel = NULL; | |
1382 | session->tunnel_sock = NULL; | |
1383 | pppol2tp_tunnel_dec_refcount(tunnel); | |
1384 | } | |
1385 | } | |
1386 | ||
1387 | kfree(session); | |
1388 | out: | |
1389 | return; | |
1390 | } | |
1391 | ||
1392 | /* Called when the PPPoX socket (session) is closed. | |
1393 | */ | |
1394 | static int pppol2tp_release(struct socket *sock) | |
1395 | { | |
1396 | struct sock *sk = sock->sk; | |
199f7d24 | 1397 | struct pppol2tp_session *session; |
3557baab JC |
1398 | int error; |
1399 | ||
1400 | if (!sk) | |
1401 | return 0; | |
1402 | ||
1403 | error = -EBADF; | |
1404 | lock_sock(sk); | |
1405 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
1406 | goto error; | |
1407 | ||
1408 | pppox_unbind_sock(sk); | |
1409 | ||
1410 | /* Signal the death of the socket. */ | |
1411 | sk->sk_state = PPPOX_DEAD; | |
1412 | sock_orphan(sk); | |
1413 | sock->sk = NULL; | |
1414 | ||
199f7d24 JC |
1415 | session = pppol2tp_sock_to_session(sk); |
1416 | ||
3557baab JC |
1417 | /* Purge any queued data */ |
1418 | skb_queue_purge(&sk->sk_receive_queue); | |
1419 | skb_queue_purge(&sk->sk_write_queue); | |
199f7d24 JC |
1420 | if (session != NULL) { |
1421 | struct sk_buff *skb; | |
1422 | while ((skb = skb_dequeue(&session->reorder_q))) { | |
1423 | kfree_skb(skb); | |
1424 | sock_put(sk); | |
1425 | } | |
e6358135 | 1426 | sock_put(sk); |
199f7d24 | 1427 | } |
3557baab JC |
1428 | |
1429 | release_sock(sk); | |
1430 | ||
1431 | /* This will delete the session context via | |
1432 | * pppol2tp_session_destruct() if the socket's refcnt drops to | |
1433 | * zero. | |
1434 | */ | |
1435 | sock_put(sk); | |
1436 | ||
1437 | return 0; | |
1438 | ||
1439 | error: | |
1440 | release_sock(sk); | |
1441 | return error; | |
1442 | } | |
1443 | ||
1444 | /* Internal function to prepare a tunnel (UDP) socket to have PPPoX | |
1445 | * sockets attached to it. | |
1446 | */ | |
1447 | static struct sock *pppol2tp_prepare_tunnel_socket(int fd, u16 tunnel_id, | |
1448 | int *error) | |
1449 | { | |
1450 | int err; | |
1451 | struct socket *sock = NULL; | |
1452 | struct sock *sk; | |
1453 | struct pppol2tp_tunnel *tunnel; | |
1454 | struct sock *ret = NULL; | |
1455 | ||
1456 | /* Get the tunnel UDP socket from the fd, which was opened by | |
1457 | * the userspace L2TP daemon. | |
1458 | */ | |
1459 | err = -EBADF; | |
1460 | sock = sockfd_lookup(fd, &err); | |
1461 | if (!sock) { | |
1462 | PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR, | |
1463 | "tunl %hu: sockfd_lookup(fd=%d) returned %d\n", | |
1464 | tunnel_id, fd, err); | |
1465 | goto err; | |
1466 | } | |
1467 | ||
a14d6abc HX |
1468 | sk = sock->sk; |
1469 | ||
3557baab | 1470 | /* Quick sanity checks */ |
a14d6abc HX |
1471 | err = -EPROTONOSUPPORT; |
1472 | if (sk->sk_protocol != IPPROTO_UDP) { | |
3557baab | 1473 | PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR, |
a14d6abc HX |
1474 | "tunl %hu: fd %d wrong protocol, got %d, expected %d\n", |
1475 | tunnel_id, fd, sk->sk_protocol, IPPROTO_UDP); | |
3557baab JC |
1476 | goto err; |
1477 | } | |
1478 | err = -EAFNOSUPPORT; | |
1479 | if (sock->ops->family != AF_INET) { | |
1480 | PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR, | |
1481 | "tunl %hu: fd %d wrong family, got %d, expected %d\n", | |
1482 | tunnel_id, fd, sock->ops->family, AF_INET); | |
1483 | goto err; | |
1484 | } | |
1485 | ||
1486 | err = -ENOTCONN; | |
3557baab JC |
1487 | |
1488 | /* Check if this socket has already been prepped */ | |
1489 | tunnel = (struct pppol2tp_tunnel *)sk->sk_user_data; | |
1490 | if (tunnel != NULL) { | |
1491 | /* User-data field already set */ | |
1492 | err = -EBUSY; | |
1493 | BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC); | |
1494 | ||
1495 | /* This socket has already been prepped */ | |
1496 | ret = tunnel->sock; | |
1497 | goto out; | |
1498 | } | |
1499 | ||
1500 | /* This socket is available and needs prepping. Create a new tunnel | |
1501 | * context and init it. | |
1502 | */ | |
1503 | sk->sk_user_data = tunnel = kzalloc(sizeof(struct pppol2tp_tunnel), GFP_KERNEL); | |
1504 | if (sk->sk_user_data == NULL) { | |
1505 | err = -ENOMEM; | |
1506 | goto err; | |
1507 | } | |
1508 | ||
1509 | tunnel->magic = L2TP_TUNNEL_MAGIC; | |
1510 | sprintf(&tunnel->name[0], "tunl %hu", tunnel_id); | |
1511 | ||
1512 | tunnel->stats.tunnel_id = tunnel_id; | |
1513 | tunnel->debug = PPPOL2TP_DEFAULT_DEBUG_FLAGS; | |
1514 | ||
1515 | /* Hook on the tunnel socket destructor so that we can cleanup | |
1516 | * if the tunnel socket goes away. | |
1517 | */ | |
1518 | tunnel->old_sk_destruct = sk->sk_destruct; | |
1519 | sk->sk_destruct = &pppol2tp_tunnel_destruct; | |
1520 | ||
1521 | tunnel->sock = sk; | |
1522 | sk->sk_allocation = GFP_ATOMIC; | |
1523 | ||
1524 | /* Misc init */ | |
1525 | rwlock_init(&tunnel->hlist_lock); | |
1526 | ||
1527 | /* Add tunnel to our list */ | |
1528 | INIT_LIST_HEAD(&tunnel->list); | |
cf3752e2 | 1529 | write_lock_bh(&pppol2tp_tunnel_list_lock); |
3557baab | 1530 | list_add(&tunnel->list, &pppol2tp_tunnel_list); |
cf3752e2 | 1531 | write_unlock_bh(&pppol2tp_tunnel_list_lock); |
3557baab JC |
1532 | atomic_inc(&pppol2tp_tunnel_count); |
1533 | ||
1534 | /* Bump the reference count. The tunnel context is deleted | |
1535 | * only when this drops to zero. | |
1536 | */ | |
1537 | pppol2tp_tunnel_inc_refcount(tunnel); | |
1538 | ||
1539 | /* Mark socket as an encapsulation socket. See net/ipv4/udp.c */ | |
1540 | (udp_sk(sk))->encap_type = UDP_ENCAP_L2TPINUDP; | |
1541 | (udp_sk(sk))->encap_rcv = pppol2tp_udp_encap_recv; | |
1542 | ||
1543 | ret = tunnel->sock; | |
1544 | ||
1545 | *error = 0; | |
1546 | out: | |
1547 | if (sock) | |
1548 | sockfd_put(sock); | |
1549 | ||
1550 | return ret; | |
1551 | ||
1552 | err: | |
1553 | *error = err; | |
1554 | goto out; | |
1555 | } | |
1556 | ||
1557 | static struct proto pppol2tp_sk_proto = { | |
1558 | .name = "PPPOL2TP", | |
1559 | .owner = THIS_MODULE, | |
1560 | .obj_size = sizeof(struct pppox_sock), | |
1561 | }; | |
1562 | ||
1563 | /* socket() handler. Initialize a new struct sock. | |
1564 | */ | |
1b8d7ae4 | 1565 | static int pppol2tp_create(struct net *net, struct socket *sock) |
3557baab JC |
1566 | { |
1567 | int error = -ENOMEM; | |
1568 | struct sock *sk; | |
1569 | ||
6257ff21 | 1570 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto); |
3557baab JC |
1571 | if (!sk) |
1572 | goto out; | |
1573 | ||
1574 | sock_init_data(sock, sk); | |
1575 | ||
1576 | sock->state = SS_UNCONNECTED; | |
1577 | sock->ops = &pppol2tp_ops; | |
1578 | ||
1579 | sk->sk_backlog_rcv = pppol2tp_recv_core; | |
1580 | sk->sk_protocol = PX_PROTO_OL2TP; | |
1581 | sk->sk_family = PF_PPPOX; | |
1582 | sk->sk_state = PPPOX_NONE; | |
1583 | sk->sk_type = SOCK_STREAM; | |
1584 | sk->sk_destruct = pppol2tp_session_destruct; | |
1585 | ||
1586 | error = 0; | |
1587 | ||
1588 | out: | |
1589 | return error; | |
1590 | } | |
1591 | ||
1592 | /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket | |
1593 | */ | |
1594 | static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
1595 | int sockaddr_len, int flags) | |
1596 | { | |
1597 | struct sock *sk = sock->sk; | |
1598 | struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr; | |
1599 | struct pppox_sock *po = pppox_sk(sk); | |
1600 | struct sock *tunnel_sock = NULL; | |
1601 | struct pppol2tp_session *session = NULL; | |
1602 | struct pppol2tp_tunnel *tunnel; | |
1603 | struct dst_entry *dst; | |
1604 | int error = 0; | |
1605 | ||
1606 | lock_sock(sk); | |
1607 | ||
1608 | error = -EINVAL; | |
1609 | if (sp->sa_protocol != PX_PROTO_OL2TP) | |
1610 | goto end; | |
1611 | ||
1612 | /* Check for already bound sockets */ | |
1613 | error = -EBUSY; | |
1614 | if (sk->sk_state & PPPOX_CONNECTED) | |
1615 | goto end; | |
1616 | ||
1617 | /* We don't supporting rebinding anyway */ | |
1618 | error = -EALREADY; | |
1619 | if (sk->sk_user_data) | |
1620 | goto end; /* socket is already attached */ | |
1621 | ||
1622 | /* Don't bind if s_tunnel is 0 */ | |
1623 | error = -EINVAL; | |
1624 | if (sp->pppol2tp.s_tunnel == 0) | |
1625 | goto end; | |
1626 | ||
1627 | /* Special case: prepare tunnel socket if s_session and | |
1628 | * d_session is 0. Otherwise look up tunnel using supplied | |
1629 | * tunnel id. | |
1630 | */ | |
1631 | if ((sp->pppol2tp.s_session == 0) && (sp->pppol2tp.d_session == 0)) { | |
1632 | tunnel_sock = pppol2tp_prepare_tunnel_socket(sp->pppol2tp.fd, | |
1633 | sp->pppol2tp.s_tunnel, | |
1634 | &error); | |
1635 | if (tunnel_sock == NULL) | |
1636 | goto end; | |
1637 | ||
1638 | tunnel = tunnel_sock->sk_user_data; | |
1639 | } else { | |
1640 | tunnel = pppol2tp_tunnel_find(sp->pppol2tp.s_tunnel); | |
1641 | ||
1642 | /* Error if we can't find the tunnel */ | |
1643 | error = -ENOENT; | |
1644 | if (tunnel == NULL) | |
1645 | goto end; | |
1646 | ||
1647 | tunnel_sock = tunnel->sock; | |
1648 | } | |
1649 | ||
1650 | /* Check that this session doesn't already exist */ | |
1651 | error = -EEXIST; | |
1652 | session = pppol2tp_session_find(tunnel, sp->pppol2tp.s_session); | |
1653 | if (session != NULL) | |
1654 | goto end; | |
1655 | ||
1656 | /* Allocate and initialize a new session context. */ | |
1657 | session = kzalloc(sizeof(struct pppol2tp_session), GFP_KERNEL); | |
1658 | if (session == NULL) { | |
1659 | error = -ENOMEM; | |
1660 | goto end; | |
1661 | } | |
1662 | ||
1663 | skb_queue_head_init(&session->reorder_q); | |
1664 | ||
1665 | session->magic = L2TP_SESSION_MAGIC; | |
1666 | session->owner = current->pid; | |
1667 | session->sock = sk; | |
1668 | session->tunnel = tunnel; | |
1669 | session->tunnel_sock = tunnel_sock; | |
1670 | session->tunnel_addr = sp->pppol2tp; | |
1671 | sprintf(&session->name[0], "sess %hu/%hu", | |
1672 | session->tunnel_addr.s_tunnel, | |
1673 | session->tunnel_addr.s_session); | |
1674 | ||
1675 | session->stats.tunnel_id = session->tunnel_addr.s_tunnel; | |
1676 | session->stats.session_id = session->tunnel_addr.s_session; | |
1677 | ||
1678 | INIT_HLIST_NODE(&session->hlist); | |
1679 | ||
1680 | /* Inherit debug options from tunnel */ | |
1681 | session->debug = tunnel->debug; | |
1682 | ||
1683 | /* Default MTU must allow space for UDP/L2TP/PPP | |
1684 | * headers. | |
1685 | */ | |
1686 | session->mtu = session->mru = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
1687 | ||
1688 | /* If PMTU discovery was enabled, use the MTU that was discovered */ | |
1689 | dst = sk_dst_get(sk); | |
1690 | if (dst != NULL) { | |
1691 | u32 pmtu = dst_mtu(__sk_dst_get(sk)); | |
1692 | if (pmtu != 0) | |
1693 | session->mtu = session->mru = pmtu - | |
1694 | PPPOL2TP_HEADER_OVERHEAD; | |
1695 | dst_release(dst); | |
1696 | } | |
1697 | ||
1698 | /* Special case: if source & dest session_id == 0x0000, this socket is | |
1699 | * being created to manage the tunnel. Don't add the session to the | |
1700 | * session hash list, just set up the internal context for use by | |
1701 | * ioctl() and sockopt() handlers. | |
1702 | */ | |
1703 | if ((session->tunnel_addr.s_session == 0) && | |
1704 | (session->tunnel_addr.d_session == 0)) { | |
1705 | error = 0; | |
1706 | sk->sk_user_data = session; | |
1707 | goto out_no_ppp; | |
1708 | } | |
1709 | ||
1710 | /* Get tunnel context from the tunnel socket */ | |
1711 | tunnel = pppol2tp_sock_to_tunnel(tunnel_sock); | |
1712 | if (tunnel == NULL) { | |
1713 | error = -EBADF; | |
1714 | goto end; | |
1715 | } | |
1716 | ||
1717 | /* Right now, because we don't have a way to push the incoming skb's | |
1718 | * straight through the UDP layer, the only header we need to worry | |
1719 | * about is the L2TP header. This size is different depending on | |
1720 | * whether sequence numbers are enabled for the data channel. | |
1721 | */ | |
1722 | po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
1723 | ||
1724 | po->chan.private = sk; | |
1725 | po->chan.ops = &pppol2tp_chan_ops; | |
1726 | po->chan.mtu = session->mtu; | |
1727 | ||
1728 | error = ppp_register_channel(&po->chan); | |
1729 | if (error) | |
24b95685 | 1730 | goto end_put_tun; |
3557baab JC |
1731 | |
1732 | /* This is how we get the session context from the socket. */ | |
1733 | sk->sk_user_data = session; | |
1734 | ||
1735 | /* Add session to the tunnel's hash list */ | |
cf3752e2 | 1736 | write_lock_bh(&tunnel->hlist_lock); |
3557baab JC |
1737 | hlist_add_head(&session->hlist, |
1738 | pppol2tp_session_id_hash(tunnel, | |
1739 | session->tunnel_addr.s_session)); | |
cf3752e2 | 1740 | write_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
1741 | |
1742 | atomic_inc(&pppol2tp_session_count); | |
1743 | ||
1744 | out_no_ppp: | |
1745 | pppol2tp_tunnel_inc_refcount(tunnel); | |
1746 | sk->sk_state = PPPOX_CONNECTED; | |
1747 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1748 | "%s: created\n", session->name); | |
1749 | ||
24b95685 JC |
1750 | end_put_tun: |
1751 | sock_put(tunnel_sock); | |
3557baab JC |
1752 | end: |
1753 | release_sock(sk); | |
1754 | ||
5dc474d6 JL |
1755 | if (error != 0) { |
1756 | if (session) | |
1757 | PRINTK(session->debug, | |
1758 | PPPOL2TP_MSG_CONTROL, KERN_WARNING, | |
1759 | "%s: connect failed: %d\n", | |
1760 | session->name, error); | |
1761 | else | |
1762 | PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_WARNING, | |
1763 | "connect failed: %d\n", error); | |
1764 | } | |
3557baab JC |
1765 | |
1766 | return error; | |
1767 | } | |
1768 | ||
1769 | /* getname() support. | |
1770 | */ | |
1771 | static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, | |
1772 | int *usockaddr_len, int peer) | |
1773 | { | |
1774 | int len = sizeof(struct sockaddr_pppol2tp); | |
1775 | struct sockaddr_pppol2tp sp; | |
1776 | int error = 0; | |
1777 | struct pppol2tp_session *session; | |
1778 | ||
1779 | error = -ENOTCONN; | |
1780 | if (sock->sk->sk_state != PPPOX_CONNECTED) | |
1781 | goto end; | |
1782 | ||
1783 | session = pppol2tp_sock_to_session(sock->sk); | |
1784 | if (session == NULL) { | |
1785 | error = -EBADF; | |
1786 | goto end; | |
1787 | } | |
1788 | ||
1789 | sp.sa_family = AF_PPPOX; | |
1790 | sp.sa_protocol = PX_PROTO_OL2TP; | |
1791 | memcpy(&sp.pppol2tp, &session->tunnel_addr, | |
1792 | sizeof(struct pppol2tp_addr)); | |
1793 | ||
1794 | memcpy(uaddr, &sp, len); | |
1795 | ||
1796 | *usockaddr_len = len; | |
1797 | ||
1798 | error = 0; | |
24b95685 | 1799 | sock_put(sock->sk); |
3557baab JC |
1800 | |
1801 | end: | |
1802 | return error; | |
1803 | } | |
1804 | ||
1805 | /**************************************************************************** | |
1806 | * ioctl() handlers. | |
1807 | * | |
1808 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1809 | * sockets. However, in order to control kernel tunnel features, we allow | |
1810 | * userspace to create a special "tunnel" PPPoX socket which is used for | |
1811 | * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow | |
1812 | * the user application to issue L2TP setsockopt(), getsockopt() and ioctl() | |
1813 | * calls. | |
1814 | ****************************************************************************/ | |
1815 | ||
1816 | /* Session ioctl helper. | |
1817 | */ | |
1818 | static int pppol2tp_session_ioctl(struct pppol2tp_session *session, | |
1819 | unsigned int cmd, unsigned long arg) | |
1820 | { | |
1821 | struct ifreq ifr; | |
1822 | int err = 0; | |
1823 | struct sock *sk = session->sock; | |
1824 | int val = (int) arg; | |
1825 | ||
1826 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG, | |
1827 | "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n", | |
1828 | session->name, cmd, arg); | |
1829 | ||
1830 | sock_hold(sk); | |
1831 | ||
1832 | switch (cmd) { | |
1833 | case SIOCGIFMTU: | |
1834 | err = -ENXIO; | |
1835 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1836 | break; | |
1837 | ||
1838 | err = -EFAULT; | |
1839 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1840 | break; | |
1841 | ifr.ifr_mtu = session->mtu; | |
1842 | if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq))) | |
1843 | break; | |
1844 | ||
1845 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1846 | "%s: get mtu=%d\n", session->name, session->mtu); | |
1847 | err = 0; | |
1848 | break; | |
1849 | ||
1850 | case SIOCSIFMTU: | |
1851 | err = -ENXIO; | |
1852 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1853 | break; | |
1854 | ||
1855 | err = -EFAULT; | |
1856 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1857 | break; | |
1858 | ||
1859 | session->mtu = ifr.ifr_mtu; | |
1860 | ||
1861 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1862 | "%s: set mtu=%d\n", session->name, session->mtu); | |
1863 | err = 0; | |
1864 | break; | |
1865 | ||
1866 | case PPPIOCGMRU: | |
1867 | err = -ENXIO; | |
1868 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1869 | break; | |
1870 | ||
1871 | err = -EFAULT; | |
1872 | if (put_user(session->mru, (int __user *) arg)) | |
1873 | break; | |
1874 | ||
1875 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1876 | "%s: get mru=%d\n", session->name, session->mru); | |
1877 | err = 0; | |
1878 | break; | |
1879 | ||
1880 | case PPPIOCSMRU: | |
1881 | err = -ENXIO; | |
1882 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1883 | break; | |
1884 | ||
1885 | err = -EFAULT; | |
1886 | if (get_user(val,(int __user *) arg)) | |
1887 | break; | |
1888 | ||
1889 | session->mru = val; | |
1890 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1891 | "%s: set mru=%d\n", session->name, session->mru); | |
1892 | err = 0; | |
1893 | break; | |
1894 | ||
1895 | case PPPIOCGFLAGS: | |
1896 | err = -EFAULT; | |
1897 | if (put_user(session->flags, (int __user *) arg)) | |
1898 | break; | |
1899 | ||
1900 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1901 | "%s: get flags=%d\n", session->name, session->flags); | |
1902 | err = 0; | |
1903 | break; | |
1904 | ||
1905 | case PPPIOCSFLAGS: | |
1906 | err = -EFAULT; | |
1907 | if (get_user(val, (int __user *) arg)) | |
1908 | break; | |
1909 | session->flags = val; | |
1910 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1911 | "%s: set flags=%d\n", session->name, session->flags); | |
1912 | err = 0; | |
1913 | break; | |
1914 | ||
1915 | case PPPIOCGL2TPSTATS: | |
1916 | err = -ENXIO; | |
1917 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1918 | break; | |
1919 | ||
1920 | if (copy_to_user((void __user *) arg, &session->stats, | |
1921 | sizeof(session->stats))) | |
1922 | break; | |
1923 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1924 | "%s: get L2TP stats\n", session->name); | |
1925 | err = 0; | |
1926 | break; | |
1927 | ||
1928 | default: | |
1929 | err = -ENOSYS; | |
1930 | break; | |
1931 | } | |
1932 | ||
1933 | sock_put(sk); | |
1934 | ||
1935 | return err; | |
1936 | } | |
1937 | ||
1938 | /* Tunnel ioctl helper. | |
1939 | * | |
1940 | * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data | |
1941 | * specifies a session_id, the session ioctl handler is called. This allows an | |
1942 | * application to retrieve session stats via a tunnel socket. | |
1943 | */ | |
1944 | static int pppol2tp_tunnel_ioctl(struct pppol2tp_tunnel *tunnel, | |
1945 | unsigned int cmd, unsigned long arg) | |
1946 | { | |
1947 | int err = 0; | |
1948 | struct sock *sk = tunnel->sock; | |
1949 | struct pppol2tp_ioc_stats stats_req; | |
1950 | ||
1951 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG, | |
1952 | "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n", tunnel->name, | |
1953 | cmd, arg); | |
1954 | ||
1955 | sock_hold(sk); | |
1956 | ||
1957 | switch (cmd) { | |
1958 | case PPPIOCGL2TPSTATS: | |
1959 | err = -ENXIO; | |
1960 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1961 | break; | |
1962 | ||
1963 | if (copy_from_user(&stats_req, (void __user *) arg, | |
1964 | sizeof(stats_req))) { | |
1965 | err = -EFAULT; | |
1966 | break; | |
1967 | } | |
1968 | if (stats_req.session_id != 0) { | |
1969 | /* resend to session ioctl handler */ | |
1970 | struct pppol2tp_session *session = | |
1971 | pppol2tp_session_find(tunnel, stats_req.session_id); | |
1972 | if (session != NULL) | |
1973 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1974 | else | |
1975 | err = -EBADR; | |
1976 | break; | |
1977 | } | |
1978 | #ifdef CONFIG_XFRM | |
1979 | tunnel->stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0; | |
1980 | #endif | |
1981 | if (copy_to_user((void __user *) arg, &tunnel->stats, | |
1982 | sizeof(tunnel->stats))) { | |
1983 | err = -EFAULT; | |
1984 | break; | |
1985 | } | |
1986 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1987 | "%s: get L2TP stats\n", tunnel->name); | |
1988 | err = 0; | |
1989 | break; | |
1990 | ||
1991 | default: | |
1992 | err = -ENOSYS; | |
1993 | break; | |
1994 | } | |
1995 | ||
1996 | sock_put(sk); | |
1997 | ||
1998 | return err; | |
1999 | } | |
2000 | ||
2001 | /* Main ioctl() handler. | |
2002 | * Dispatch to tunnel or session helpers depending on the socket. | |
2003 | */ | |
2004 | static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, | |
2005 | unsigned long arg) | |
2006 | { | |
2007 | struct sock *sk = sock->sk; | |
2008 | struct pppol2tp_session *session; | |
2009 | struct pppol2tp_tunnel *tunnel; | |
2010 | int err; | |
2011 | ||
2012 | if (!sk) | |
2013 | return 0; | |
2014 | ||
2015 | err = -EBADF; | |
2016 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
2017 | goto end; | |
2018 | ||
2019 | err = -ENOTCONN; | |
2020 | if ((sk->sk_user_data == NULL) || | |
2021 | (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)))) | |
2022 | goto end; | |
2023 | ||
2024 | /* Get session context from the socket */ | |
2025 | err = -EBADF; | |
2026 | session = pppol2tp_sock_to_session(sk); | |
2027 | if (session == NULL) | |
2028 | goto end; | |
2029 | ||
2030 | /* Special case: if session's session_id is zero, treat ioctl as a | |
2031 | * tunnel ioctl | |
2032 | */ | |
2033 | if ((session->tunnel_addr.s_session == 0) && | |
2034 | (session->tunnel_addr.d_session == 0)) { | |
2035 | err = -EBADF; | |
2036 | tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock); | |
2037 | if (tunnel == NULL) | |
24b95685 | 2038 | goto end_put_sess; |
3557baab JC |
2039 | |
2040 | err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg); | |
24b95685 JC |
2041 | sock_put(session->tunnel_sock); |
2042 | goto end_put_sess; | |
3557baab JC |
2043 | } |
2044 | ||
2045 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
2046 | ||
24b95685 JC |
2047 | end_put_sess: |
2048 | sock_put(sk); | |
3557baab JC |
2049 | end: |
2050 | return err; | |
2051 | } | |
2052 | ||
2053 | /***************************************************************************** | |
2054 | * setsockopt() / getsockopt() support. | |
2055 | * | |
2056 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
2057 | * sockets. In order to control kernel tunnel features, we allow userspace to | |
2058 | * create a special "tunnel" PPPoX socket which is used for control only. | |
2059 | * Tunnel PPPoX sockets have session_id == 0 and simply allow the user | |
2060 | * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls. | |
2061 | *****************************************************************************/ | |
2062 | ||
2063 | /* Tunnel setsockopt() helper. | |
2064 | */ | |
2065 | static int pppol2tp_tunnel_setsockopt(struct sock *sk, | |
2066 | struct pppol2tp_tunnel *tunnel, | |
2067 | int optname, int val) | |
2068 | { | |
2069 | int err = 0; | |
2070 | ||
2071 | switch (optname) { | |
2072 | case PPPOL2TP_SO_DEBUG: | |
2073 | tunnel->debug = val; | |
2074 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2075 | "%s: set debug=%x\n", tunnel->name, tunnel->debug); | |
2076 | break; | |
2077 | ||
2078 | default: | |
2079 | err = -ENOPROTOOPT; | |
2080 | break; | |
2081 | } | |
2082 | ||
2083 | return err; | |
2084 | } | |
2085 | ||
2086 | /* Session setsockopt helper. | |
2087 | */ | |
2088 | static int pppol2tp_session_setsockopt(struct sock *sk, | |
2089 | struct pppol2tp_session *session, | |
2090 | int optname, int val) | |
2091 | { | |
2092 | int err = 0; | |
2093 | ||
2094 | switch (optname) { | |
2095 | case PPPOL2TP_SO_RECVSEQ: | |
2096 | if ((val != 0) && (val != 1)) { | |
2097 | err = -EINVAL; | |
2098 | break; | |
2099 | } | |
2100 | session->recv_seq = val ? -1 : 0; | |
2101 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2102 | "%s: set recv_seq=%d\n", session->name, | |
2103 | session->recv_seq); | |
2104 | break; | |
2105 | ||
2106 | case PPPOL2TP_SO_SENDSEQ: | |
2107 | if ((val != 0) && (val != 1)) { | |
2108 | err = -EINVAL; | |
2109 | break; | |
2110 | } | |
2111 | session->send_seq = val ? -1 : 0; | |
2112 | { | |
2113 | struct sock *ssk = session->sock; | |
2114 | struct pppox_sock *po = pppox_sk(ssk); | |
2115 | po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ : | |
2116 | PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
2117 | } | |
2118 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2119 | "%s: set send_seq=%d\n", session->name, session->send_seq); | |
2120 | break; | |
2121 | ||
2122 | case PPPOL2TP_SO_LNSMODE: | |
2123 | if ((val != 0) && (val != 1)) { | |
2124 | err = -EINVAL; | |
2125 | break; | |
2126 | } | |
2127 | session->lns_mode = val ? -1 : 0; | |
2128 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2129 | "%s: set lns_mode=%d\n", session->name, | |
2130 | session->lns_mode); | |
2131 | break; | |
2132 | ||
2133 | case PPPOL2TP_SO_DEBUG: | |
2134 | session->debug = val; | |
2135 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2136 | "%s: set debug=%x\n", session->name, session->debug); | |
2137 | break; | |
2138 | ||
2139 | case PPPOL2TP_SO_REORDERTO: | |
2140 | session->reorder_timeout = msecs_to_jiffies(val); | |
2141 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2142 | "%s: set reorder_timeout=%d\n", session->name, | |
2143 | session->reorder_timeout); | |
2144 | break; | |
2145 | ||
2146 | default: | |
2147 | err = -ENOPROTOOPT; | |
2148 | break; | |
2149 | } | |
2150 | ||
2151 | return err; | |
2152 | } | |
2153 | ||
2154 | /* Main setsockopt() entry point. | |
2155 | * Does API checks, then calls either the tunnel or session setsockopt | |
2156 | * handler, according to whether the PPPoL2TP socket is a for a regular | |
2157 | * session or the special tunnel type. | |
2158 | */ | |
2159 | static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, | |
2160 | char __user *optval, int optlen) | |
2161 | { | |
2162 | struct sock *sk = sock->sk; | |
2163 | struct pppol2tp_session *session = sk->sk_user_data; | |
2164 | struct pppol2tp_tunnel *tunnel; | |
2165 | int val; | |
2166 | int err; | |
2167 | ||
2168 | if (level != SOL_PPPOL2TP) | |
2169 | return udp_prot.setsockopt(sk, level, optname, optval, optlen); | |
2170 | ||
2171 | if (optlen < sizeof(int)) | |
2172 | return -EINVAL; | |
2173 | ||
2174 | if (get_user(val, (int __user *)optval)) | |
2175 | return -EFAULT; | |
2176 | ||
2177 | err = -ENOTCONN; | |
2178 | if (sk->sk_user_data == NULL) | |
2179 | goto end; | |
2180 | ||
2181 | /* Get session context from the socket */ | |
2182 | err = -EBADF; | |
2183 | session = pppol2tp_sock_to_session(sk); | |
2184 | if (session == NULL) | |
2185 | goto end; | |
2186 | ||
2187 | /* Special case: if session_id == 0x0000, treat as operation on tunnel | |
2188 | */ | |
2189 | if ((session->tunnel_addr.s_session == 0) && | |
2190 | (session->tunnel_addr.d_session == 0)) { | |
2191 | err = -EBADF; | |
2192 | tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock); | |
2193 | if (tunnel == NULL) | |
24b95685 | 2194 | goto end_put_sess; |
3557baab JC |
2195 | |
2196 | err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); | |
24b95685 | 2197 | sock_put(session->tunnel_sock); |
3557baab JC |
2198 | } else |
2199 | err = pppol2tp_session_setsockopt(sk, session, optname, val); | |
2200 | ||
2201 | err = 0; | |
2202 | ||
24b95685 JC |
2203 | end_put_sess: |
2204 | sock_put(sk); | |
3557baab JC |
2205 | end: |
2206 | return err; | |
2207 | } | |
2208 | ||
2209 | /* Tunnel getsockopt helper. Called with sock locked. | |
2210 | */ | |
2211 | static int pppol2tp_tunnel_getsockopt(struct sock *sk, | |
2212 | struct pppol2tp_tunnel *tunnel, | |
af3b162a | 2213 | int optname, int *val) |
3557baab JC |
2214 | { |
2215 | int err = 0; | |
2216 | ||
2217 | switch (optname) { | |
2218 | case PPPOL2TP_SO_DEBUG: | |
2219 | *val = tunnel->debug; | |
2220 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2221 | "%s: get debug=%x\n", tunnel->name, tunnel->debug); | |
2222 | break; | |
2223 | ||
2224 | default: | |
2225 | err = -ENOPROTOOPT; | |
2226 | break; | |
2227 | } | |
2228 | ||
2229 | return err; | |
2230 | } | |
2231 | ||
2232 | /* Session getsockopt helper. Called with sock locked. | |
2233 | */ | |
2234 | static int pppol2tp_session_getsockopt(struct sock *sk, | |
2235 | struct pppol2tp_session *session, | |
af3b162a | 2236 | int optname, int *val) |
3557baab JC |
2237 | { |
2238 | int err = 0; | |
2239 | ||
2240 | switch (optname) { | |
2241 | case PPPOL2TP_SO_RECVSEQ: | |
2242 | *val = session->recv_seq; | |
2243 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2244 | "%s: get recv_seq=%d\n", session->name, *val); | |
2245 | break; | |
2246 | ||
2247 | case PPPOL2TP_SO_SENDSEQ: | |
2248 | *val = session->send_seq; | |
2249 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2250 | "%s: get send_seq=%d\n", session->name, *val); | |
2251 | break; | |
2252 | ||
2253 | case PPPOL2TP_SO_LNSMODE: | |
2254 | *val = session->lns_mode; | |
2255 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2256 | "%s: get lns_mode=%d\n", session->name, *val); | |
2257 | break; | |
2258 | ||
2259 | case PPPOL2TP_SO_DEBUG: | |
2260 | *val = session->debug; | |
2261 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2262 | "%s: get debug=%d\n", session->name, *val); | |
2263 | break; | |
2264 | ||
2265 | case PPPOL2TP_SO_REORDERTO: | |
2266 | *val = (int) jiffies_to_msecs(session->reorder_timeout); | |
2267 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2268 | "%s: get reorder_timeout=%d\n", session->name, *val); | |
2269 | break; | |
2270 | ||
2271 | default: | |
2272 | err = -ENOPROTOOPT; | |
2273 | } | |
2274 | ||
2275 | return err; | |
2276 | } | |
2277 | ||
2278 | /* Main getsockopt() entry point. | |
2279 | * Does API checks, then calls either the tunnel or session getsockopt | |
2280 | * handler, according to whether the PPPoX socket is a for a regular session | |
2281 | * or the special tunnel type. | |
2282 | */ | |
2283 | static int pppol2tp_getsockopt(struct socket *sock, int level, | |
2284 | int optname, char __user *optval, int __user *optlen) | |
2285 | { | |
2286 | struct sock *sk = sock->sk; | |
2287 | struct pppol2tp_session *session = sk->sk_user_data; | |
2288 | struct pppol2tp_tunnel *tunnel; | |
2289 | int val, len; | |
2290 | int err; | |
2291 | ||
2292 | if (level != SOL_PPPOL2TP) | |
2293 | return udp_prot.getsockopt(sk, level, optname, optval, optlen); | |
2294 | ||
2295 | if (get_user(len, (int __user *) optlen)) | |
2296 | return -EFAULT; | |
2297 | ||
2298 | len = min_t(unsigned int, len, sizeof(int)); | |
2299 | ||
2300 | if (len < 0) | |
2301 | return -EINVAL; | |
2302 | ||
2303 | err = -ENOTCONN; | |
2304 | if (sk->sk_user_data == NULL) | |
2305 | goto end; | |
2306 | ||
2307 | /* Get the session context */ | |
2308 | err = -EBADF; | |
2309 | session = pppol2tp_sock_to_session(sk); | |
2310 | if (session == NULL) | |
2311 | goto end; | |
2312 | ||
2313 | /* Special case: if session_id == 0x0000, treat as operation on tunnel */ | |
2314 | if ((session->tunnel_addr.s_session == 0) && | |
2315 | (session->tunnel_addr.d_session == 0)) { | |
2316 | err = -EBADF; | |
2317 | tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock); | |
2318 | if (tunnel == NULL) | |
24b95685 | 2319 | goto end_put_sess; |
3557baab JC |
2320 | |
2321 | err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); | |
24b95685 | 2322 | sock_put(session->tunnel_sock); |
3557baab JC |
2323 | } else |
2324 | err = pppol2tp_session_getsockopt(sk, session, optname, &val); | |
2325 | ||
2326 | err = -EFAULT; | |
2327 | if (put_user(len, (int __user *) optlen)) | |
24b95685 | 2328 | goto end_put_sess; |
3557baab JC |
2329 | |
2330 | if (copy_to_user((void __user *) optval, &val, len)) | |
24b95685 | 2331 | goto end_put_sess; |
3557baab JC |
2332 | |
2333 | err = 0; | |
24b95685 JC |
2334 | |
2335 | end_put_sess: | |
2336 | sock_put(sk); | |
3557baab JC |
2337 | end: |
2338 | return err; | |
2339 | } | |
2340 | ||
2341 | /***************************************************************************** | |
2342 | * /proc filesystem for debug | |
2343 | *****************************************************************************/ | |
2344 | ||
2345 | #ifdef CONFIG_PROC_FS | |
2346 | ||
2347 | #include <linux/seq_file.h> | |
2348 | ||
2349 | struct pppol2tp_seq_data { | |
2350 | struct pppol2tp_tunnel *tunnel; /* current tunnel */ | |
2351 | struct pppol2tp_session *session; /* NULL means get first session in tunnel */ | |
2352 | }; | |
2353 | ||
2354 | static struct pppol2tp_session *next_session(struct pppol2tp_tunnel *tunnel, struct pppol2tp_session *curr) | |
2355 | { | |
2356 | struct pppol2tp_session *session = NULL; | |
2357 | struct hlist_node *walk; | |
2358 | int found = 0; | |
2359 | int next = 0; | |
2360 | int i; | |
2361 | ||
cf3752e2 | 2362 | read_lock_bh(&tunnel->hlist_lock); |
3557baab JC |
2363 | for (i = 0; i < PPPOL2TP_HASH_SIZE; i++) { |
2364 | hlist_for_each_entry(session, walk, &tunnel->session_hlist[i], hlist) { | |
2365 | if (curr == NULL) { | |
2366 | found = 1; | |
2367 | goto out; | |
2368 | } | |
2369 | if (session == curr) { | |
2370 | next = 1; | |
2371 | continue; | |
2372 | } | |
2373 | if (next) { | |
2374 | found = 1; | |
2375 | goto out; | |
2376 | } | |
2377 | } | |
2378 | } | |
2379 | out: | |
cf3752e2 | 2380 | read_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
2381 | if (!found) |
2382 | session = NULL; | |
2383 | ||
2384 | return session; | |
2385 | } | |
2386 | ||
2387 | static struct pppol2tp_tunnel *next_tunnel(struct pppol2tp_tunnel *curr) | |
2388 | { | |
2389 | struct pppol2tp_tunnel *tunnel = NULL; | |
2390 | ||
cf3752e2 | 2391 | read_lock_bh(&pppol2tp_tunnel_list_lock); |
3557baab JC |
2392 | if (list_is_last(&curr->list, &pppol2tp_tunnel_list)) { |
2393 | goto out; | |
2394 | } | |
2395 | tunnel = list_entry(curr->list.next, struct pppol2tp_tunnel, list); | |
2396 | out: | |
cf3752e2 | 2397 | read_unlock_bh(&pppol2tp_tunnel_list_lock); |
3557baab JC |
2398 | |
2399 | return tunnel; | |
2400 | } | |
2401 | ||
2402 | static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs) | |
2403 | { | |
2404 | struct pppol2tp_seq_data *pd = SEQ_START_TOKEN; | |
2405 | loff_t pos = *offs; | |
2406 | ||
2407 | if (!pos) | |
2408 | goto out; | |
2409 | ||
2410 | BUG_ON(m->private == NULL); | |
2411 | pd = m->private; | |
2412 | ||
2413 | if (pd->tunnel == NULL) { | |
2414 | if (!list_empty(&pppol2tp_tunnel_list)) | |
2415 | pd->tunnel = list_entry(pppol2tp_tunnel_list.next, struct pppol2tp_tunnel, list); | |
2416 | } else { | |
2417 | pd->session = next_session(pd->tunnel, pd->session); | |
2418 | if (pd->session == NULL) { | |
2419 | pd->tunnel = next_tunnel(pd->tunnel); | |
2420 | } | |
2421 | } | |
2422 | ||
2423 | /* NULL tunnel and session indicates end of list */ | |
2424 | if ((pd->tunnel == NULL) && (pd->session == NULL)) | |
2425 | pd = NULL; | |
2426 | ||
2427 | out: | |
2428 | return pd; | |
2429 | } | |
2430 | ||
2431 | static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
2432 | { | |
2433 | (*pos)++; | |
2434 | return NULL; | |
2435 | } | |
2436 | ||
2437 | static void pppol2tp_seq_stop(struct seq_file *p, void *v) | |
2438 | { | |
2439 | /* nothing to do */ | |
2440 | } | |
2441 | ||
2442 | static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v) | |
2443 | { | |
2444 | struct pppol2tp_tunnel *tunnel = v; | |
2445 | ||
2446 | seq_printf(m, "\nTUNNEL '%s', %c %d\n", | |
2447 | tunnel->name, | |
2448 | (tunnel == tunnel->sock->sk_user_data) ? 'Y':'N', | |
2449 | atomic_read(&tunnel->ref_count) - 1); | |
2450 | seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n", | |
2451 | tunnel->debug, | |
0efeaa33 AM |
2452 | (unsigned long long)tunnel->stats.tx_packets, |
2453 | (unsigned long long)tunnel->stats.tx_bytes, | |
2454 | (unsigned long long)tunnel->stats.tx_errors, | |
2455 | (unsigned long long)tunnel->stats.rx_packets, | |
2456 | (unsigned long long)tunnel->stats.rx_bytes, | |
2457 | (unsigned long long)tunnel->stats.rx_errors); | |
3557baab JC |
2458 | } |
2459 | ||
2460 | static void pppol2tp_seq_session_show(struct seq_file *m, void *v) | |
2461 | { | |
2462 | struct pppol2tp_session *session = v; | |
2463 | ||
2464 | seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> " | |
2465 | "%04X/%04X %d %c\n", | |
2466 | session->name, | |
2467 | ntohl(session->tunnel_addr.addr.sin_addr.s_addr), | |
2468 | ntohs(session->tunnel_addr.addr.sin_port), | |
2469 | session->tunnel_addr.s_tunnel, | |
2470 | session->tunnel_addr.s_session, | |
2471 | session->tunnel_addr.d_tunnel, | |
2472 | session->tunnel_addr.d_session, | |
2473 | session->sock->sk_state, | |
2474 | (session == session->sock->sk_user_data) ? | |
2475 | 'Y' : 'N'); | |
2476 | seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n", | |
2477 | session->mtu, session->mru, | |
2478 | session->recv_seq ? 'R' : '-', | |
2479 | session->send_seq ? 'S' : '-', | |
2480 | session->lns_mode ? "LNS" : "LAC", | |
2481 | session->debug, | |
2482 | jiffies_to_msecs(session->reorder_timeout)); | |
2483 | seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n", | |
2484 | session->nr, session->ns, | |
0efeaa33 AM |
2485 | (unsigned long long)session->stats.tx_packets, |
2486 | (unsigned long long)session->stats.tx_bytes, | |
2487 | (unsigned long long)session->stats.tx_errors, | |
2488 | (unsigned long long)session->stats.rx_packets, | |
2489 | (unsigned long long)session->stats.rx_bytes, | |
2490 | (unsigned long long)session->stats.rx_errors); | |
3557baab JC |
2491 | } |
2492 | ||
2493 | static int pppol2tp_seq_show(struct seq_file *m, void *v) | |
2494 | { | |
2495 | struct pppol2tp_seq_data *pd = v; | |
2496 | ||
2497 | /* display header on line 1 */ | |
2498 | if (v == SEQ_START_TOKEN) { | |
2499 | seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n"); | |
2500 | seq_puts(m, "TUNNEL name, user-data-ok session-count\n"); | |
2501 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
2502 | seq_puts(m, " SESSION name, addr/port src-tid/sid " | |
2503 | "dest-tid/sid state user-data-ok\n"); | |
2504 | seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n"); | |
2505 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
2506 | goto out; | |
2507 | } | |
2508 | ||
2509 | /* Show the tunnel or session context. | |
2510 | */ | |
2511 | if (pd->session == NULL) | |
2512 | pppol2tp_seq_tunnel_show(m, pd->tunnel); | |
2513 | else | |
2514 | pppol2tp_seq_session_show(m, pd->session); | |
2515 | ||
2516 | out: | |
2517 | return 0; | |
2518 | } | |
2519 | ||
2520 | static struct seq_operations pppol2tp_seq_ops = { | |
2521 | .start = pppol2tp_seq_start, | |
2522 | .next = pppol2tp_seq_next, | |
2523 | .stop = pppol2tp_seq_stop, | |
2524 | .show = pppol2tp_seq_show, | |
2525 | }; | |
2526 | ||
2527 | /* Called when our /proc file is opened. We allocate data for use when | |
2528 | * iterating our tunnel / session contexts and store it in the private | |
2529 | * data of the seq_file. | |
2530 | */ | |
2531 | static int pppol2tp_proc_open(struct inode *inode, struct file *file) | |
2532 | { | |
2533 | struct seq_file *m; | |
2534 | struct pppol2tp_seq_data *pd; | |
2535 | int ret = 0; | |
2536 | ||
2537 | ret = seq_open(file, &pppol2tp_seq_ops); | |
2538 | if (ret < 0) | |
2539 | goto out; | |
2540 | ||
2541 | m = file->private_data; | |
2542 | ||
2543 | /* Allocate and fill our proc_data for access later */ | |
2544 | ret = -ENOMEM; | |
2545 | m->private = kzalloc(sizeof(struct pppol2tp_seq_data), GFP_KERNEL); | |
2546 | if (m->private == NULL) | |
2547 | goto out; | |
2548 | ||
2549 | pd = m->private; | |
2550 | ret = 0; | |
2551 | ||
2552 | out: | |
2553 | return ret; | |
2554 | } | |
2555 | ||
2556 | /* Called when /proc file access completes. | |
2557 | */ | |
2558 | static int pppol2tp_proc_release(struct inode *inode, struct file *file) | |
2559 | { | |
2560 | struct seq_file *m = (struct seq_file *)file->private_data; | |
2561 | ||
2562 | kfree(m->private); | |
2563 | m->private = NULL; | |
2564 | ||
2565 | return seq_release(inode, file); | |
2566 | } | |
2567 | ||
2568 | static struct file_operations pppol2tp_proc_fops = { | |
2569 | .owner = THIS_MODULE, | |
2570 | .open = pppol2tp_proc_open, | |
2571 | .read = seq_read, | |
2572 | .llseek = seq_lseek, | |
2573 | .release = pppol2tp_proc_release, | |
2574 | }; | |
2575 | ||
2576 | static struct proc_dir_entry *pppol2tp_proc; | |
2577 | ||
2578 | #endif /* CONFIG_PROC_FS */ | |
2579 | ||
2580 | /***************************************************************************** | |
2581 | * Init and cleanup | |
2582 | *****************************************************************************/ | |
2583 | ||
2584 | static struct proto_ops pppol2tp_ops = { | |
2585 | .family = AF_PPPOX, | |
2586 | .owner = THIS_MODULE, | |
2587 | .release = pppol2tp_release, | |
2588 | .bind = sock_no_bind, | |
2589 | .connect = pppol2tp_connect, | |
2590 | .socketpair = sock_no_socketpair, | |
2591 | .accept = sock_no_accept, | |
2592 | .getname = pppol2tp_getname, | |
2593 | .poll = datagram_poll, | |
2594 | .listen = sock_no_listen, | |
2595 | .shutdown = sock_no_shutdown, | |
2596 | .setsockopt = pppol2tp_setsockopt, | |
2597 | .getsockopt = pppol2tp_getsockopt, | |
2598 | .sendmsg = pppol2tp_sendmsg, | |
2599 | .recvmsg = pppol2tp_recvmsg, | |
2600 | .mmap = sock_no_mmap, | |
2601 | .ioctl = pppox_ioctl, | |
2602 | }; | |
2603 | ||
2604 | static struct pppox_proto pppol2tp_proto = { | |
2605 | .create = pppol2tp_create, | |
2606 | .ioctl = pppol2tp_ioctl | |
2607 | }; | |
2608 | ||
2609 | static int __init pppol2tp_init(void) | |
2610 | { | |
2611 | int err; | |
2612 | ||
2613 | err = proto_register(&pppol2tp_sk_proto, 0); | |
2614 | if (err) | |
2615 | goto out; | |
2616 | err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto); | |
2617 | if (err) | |
2618 | goto out_unregister_pppol2tp_proto; | |
2619 | ||
2620 | #ifdef CONFIG_PROC_FS | |
a95609cb DL |
2621 | pppol2tp_proc = proc_net_fops_create(&init_net, "pppol2tp", 0, |
2622 | &pppol2tp_proc_fops); | |
3557baab JC |
2623 | if (!pppol2tp_proc) { |
2624 | err = -ENOMEM; | |
2625 | goto out_unregister_pppox_proto; | |
2626 | } | |
3557baab JC |
2627 | #endif /* CONFIG_PROC_FS */ |
2628 | printk(KERN_INFO "PPPoL2TP kernel driver, %s\n", | |
2629 | PPPOL2TP_DRV_VERSION); | |
2630 | ||
2631 | out: | |
2632 | return err; | |
731a0609 | 2633 | #ifdef CONFIG_PROC_FS |
3557baab JC |
2634 | out_unregister_pppox_proto: |
2635 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
731a0609 | 2636 | #endif |
3557baab JC |
2637 | out_unregister_pppol2tp_proto: |
2638 | proto_unregister(&pppol2tp_sk_proto); | |
2639 | goto out; | |
2640 | } | |
2641 | ||
2642 | static void __exit pppol2tp_exit(void) | |
2643 | { | |
2644 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
2645 | ||
2646 | #ifdef CONFIG_PROC_FS | |
457c4cbc | 2647 | remove_proc_entry("pppol2tp", init_net.proc_net); |
3557baab JC |
2648 | #endif |
2649 | proto_unregister(&pppol2tp_sk_proto); | |
2650 | } | |
2651 | ||
2652 | module_init(pppol2tp_init); | |
2653 | module_exit(pppol2tp_exit); | |
2654 | ||
2450022a | 2655 | MODULE_AUTHOR("Martijn van Oosterhout <kleptog@svana.org>, " |
3557baab JC |
2656 | "James Chapman <jchapman@katalix.com>"); |
2657 | MODULE_DESCRIPTION("PPP over L2TP over UDP"); | |
2658 | MODULE_LICENSE("GPL"); | |
2659 | MODULE_VERSION(PPPOL2TP_DRV_VERSION); |