blob: 244d7830c92aac88486981f7ec52b3d3b141631f [file] [log] [blame]
James Chapman3557baa2007-06-27 15:49:24 -07001/*****************************************************************************
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>
64#include <linux/version.h>
65#include <linux/string.h>
66#include <linux/list.h>
67#include <asm/uaccess.h>
68
69#include <linux/kernel.h>
70#include <linux/spinlock.h>
71#include <linux/kthread.h>
72#include <linux/sched.h>
73#include <linux/slab.h>
74#include <linux/errno.h>
75#include <linux/jiffies.h>
76
77#include <linux/netdevice.h>
78#include <linux/net.h>
79#include <linux/inetdevice.h>
80#include <linux/skbuff.h>
81#include <linux/init.h>
82#include <linux/ip.h>
83#include <linux/udp.h>
84#include <linux/if_pppox.h>
85#include <linux/if_pppol2tp.h>
86#include <net/sock.h>
87#include <linux/ppp_channel.h>
88#include <linux/ppp_defs.h>
89#include <linux/if_ppp.h>
90#include <linux/file.h>
91#include <linux/hash.h>
92#include <linux/sort.h>
93#include <linux/proc_fs.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020094#include <net/net_namespace.h>
James Chapman3557baa2007-06-27 15:49:24 -070095#include <net/dst.h>
96#include <net/ip.h>
97#include <net/udp.h>
98#include <net/xfrm.h>
99
100#include <asm/byteorder.h>
101#include <asm/atomic.h>
102
103
104#define PPPOL2TP_DRV_VERSION "V1.0"
105
106/* L2TP header constants */
107#define L2TP_HDRFLAG_T 0x8000
108#define L2TP_HDRFLAG_L 0x4000
109#define L2TP_HDRFLAG_S 0x0800
110#define L2TP_HDRFLAG_O 0x0200
111#define L2TP_HDRFLAG_P 0x0100
112
113#define L2TP_HDR_VER_MASK 0x000F
114#define L2TP_HDR_VER 0x0002
115
116/* Space for UDP, L2TP and PPP headers */
117#define PPPOL2TP_HEADER_OVERHEAD 40
118
119/* Just some random numbers */
120#define L2TP_TUNNEL_MAGIC 0x42114DDA
121#define L2TP_SESSION_MAGIC 0x0C04EB7D
122
123#define PPPOL2TP_HASH_BITS 4
124#define PPPOL2TP_HASH_SIZE (1 << PPPOL2TP_HASH_BITS)
125
126/* Default trace flags */
127#define PPPOL2TP_DEFAULT_DEBUG_FLAGS 0
128
129#define PRINTK(_mask, _type, _lvl, _fmt, args...) \
130 do { \
131 if ((_mask) & (_type)) \
132 printk(_lvl "PPPOL2TP: " _fmt, ##args); \
133 } while(0)
134
135/* Number of bytes to build transmit L2TP headers.
136 * Unfortunately the size is different depending on whether sequence numbers
137 * are enabled.
138 */
139#define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10
140#define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6
141
142struct pppol2tp_tunnel;
143
144/* Describes a session. It is the sk_user_data field in the PPPoL2TP
145 * socket. Contains information to determine incoming packets and transmit
146 * outgoing ones.
147 */
148struct pppol2tp_session
149{
150 int magic; /* should be
151 * L2TP_SESSION_MAGIC */
152 int owner; /* pid that opened the socket */
153
154 struct sock *sock; /* Pointer to the session
155 * PPPoX socket */
156 struct sock *tunnel_sock; /* Pointer to the tunnel UDP
157 * socket */
158
159 struct pppol2tp_addr tunnel_addr; /* Description of tunnel */
160
161 struct pppol2tp_tunnel *tunnel; /* back pointer to tunnel
162 * context */
163
164 char name[20]; /* "sess xxxxx/yyyyy", where
165 * x=tunnel_id, y=session_id */
166 int mtu;
167 int mru;
168 int flags; /* accessed by PPPIOCGFLAGS.
169 * Unused. */
170 unsigned recv_seq:1; /* expect receive packets with
171 * sequence numbers? */
172 unsigned send_seq:1; /* send packets with sequence
173 * numbers? */
174 unsigned lns_mode:1; /* behave as LNS? LAC enables
175 * sequence numbers under
176 * control of LNS. */
177 int debug; /* bitmask of debug message
178 * categories */
179 int reorder_timeout; /* configured reorder timeout
180 * (in jiffies) */
181 u16 nr; /* session NR state (receive) */
182 u16 ns; /* session NR state (send) */
183 struct sk_buff_head reorder_q; /* receive reorder queue */
184 struct pppol2tp_ioc_stats stats;
185 struct hlist_node hlist; /* Hash list node */
186};
187
188/* The sk_user_data field of the tunnel's UDP socket. It contains info to track
189 * all the associated sessions so incoming packets can be sorted out
190 */
191struct pppol2tp_tunnel
192{
193 int magic; /* Should be L2TP_TUNNEL_MAGIC */
194 rwlock_t hlist_lock; /* protect session_hlist */
195 struct hlist_head session_hlist[PPPOL2TP_HASH_SIZE];
196 /* hashed list of sessions,
197 * hashed by id */
198 int debug; /* bitmask of debug message
199 * categories */
200 char name[12]; /* "tunl xxxxx" */
201 struct pppol2tp_ioc_stats stats;
202
203 void (*old_sk_destruct)(struct sock *);
204
205 struct sock *sock; /* Parent socket */
206 struct list_head list; /* Keep a list of all open
207 * prepared sockets */
208
209 atomic_t ref_count;
210};
211
212/* Private data stored for received packets in the skb.
213 */
214struct pppol2tp_skb_cb {
215 u16 ns;
216 u16 nr;
217 u16 has_seq;
218 u16 length;
219 unsigned long expires;
220};
221
222#define PPPOL2TP_SKB_CB(skb) ((struct pppol2tp_skb_cb *) &skb->cb[sizeof(struct inet_skb_parm)])
223
224static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
225static void pppol2tp_tunnel_free(struct pppol2tp_tunnel *tunnel);
226
227static atomic_t pppol2tp_tunnel_count;
228static atomic_t pppol2tp_session_count;
229static struct ppp_channel_ops pppol2tp_chan_ops = { pppol2tp_xmit , NULL };
230static struct proto_ops pppol2tp_ops;
231static LIST_HEAD(pppol2tp_tunnel_list);
232static DEFINE_RWLOCK(pppol2tp_tunnel_list_lock);
233
234/* Helpers to obtain tunnel/session contexts from sockets.
235 */
236static inline struct pppol2tp_session *pppol2tp_sock_to_session(struct sock *sk)
237{
238 struct pppol2tp_session *session;
239
240 if (sk == NULL)
241 return NULL;
242
243 session = (struct pppol2tp_session *)(sk->sk_user_data);
244 if (session == NULL)
245 return NULL;
246
247 BUG_ON(session->magic != L2TP_SESSION_MAGIC);
248
249 return session;
250}
251
252static inline struct pppol2tp_tunnel *pppol2tp_sock_to_tunnel(struct sock *sk)
253{
254 struct pppol2tp_tunnel *tunnel;
255
256 if (sk == NULL)
257 return NULL;
258
259 tunnel = (struct pppol2tp_tunnel *)(sk->sk_user_data);
260 if (tunnel == NULL)
261 return NULL;
262
263 BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);
264
265 return tunnel;
266}
267
268/* Tunnel reference counts. Incremented per session that is added to
269 * the tunnel.
270 */
271static inline void pppol2tp_tunnel_inc_refcount(struct pppol2tp_tunnel *tunnel)
272{
273 atomic_inc(&tunnel->ref_count);
274}
275
276static inline void pppol2tp_tunnel_dec_refcount(struct pppol2tp_tunnel *tunnel)
277{
278 if (atomic_dec_and_test(&tunnel->ref_count))
279 pppol2tp_tunnel_free(tunnel);
280}
281
282/* Session hash list.
283 * The session_id SHOULD be random according to RFC2661, but several
284 * L2TP implementations (Cisco and Microsoft) use incrementing
285 * session_ids. So we do a real hash on the session_id, rather than a
286 * simple bitmask.
287 */
288static inline struct hlist_head *
289pppol2tp_session_id_hash(struct pppol2tp_tunnel *tunnel, u16 session_id)
290{
291 unsigned long hash_val = (unsigned long) session_id;
292 return &tunnel->session_hlist[hash_long(hash_val, PPPOL2TP_HASH_BITS)];
293}
294
295/* Lookup a session by id
296 */
297static struct pppol2tp_session *
298pppol2tp_session_find(struct pppol2tp_tunnel *tunnel, u16 session_id)
299{
300 struct hlist_head *session_list =
301 pppol2tp_session_id_hash(tunnel, session_id);
302 struct pppol2tp_session *session;
303 struct hlist_node *walk;
304
James Chapmancf3752e2008-03-05 18:39:08 -0800305 read_lock_bh(&tunnel->hlist_lock);
James Chapman3557baa2007-06-27 15:49:24 -0700306 hlist_for_each_entry(session, walk, session_list, hlist) {
307 if (session->tunnel_addr.s_session == session_id) {
James Chapmancf3752e2008-03-05 18:39:08 -0800308 read_unlock_bh(&tunnel->hlist_lock);
James Chapman3557baa2007-06-27 15:49:24 -0700309 return session;
310 }
311 }
James Chapmancf3752e2008-03-05 18:39:08 -0800312 read_unlock_bh(&tunnel->hlist_lock);
James Chapman3557baa2007-06-27 15:49:24 -0700313
314 return NULL;
315}
316
317/* Lookup a tunnel by id
318 */
319static struct pppol2tp_tunnel *pppol2tp_tunnel_find(u16 tunnel_id)
320{
321 struct pppol2tp_tunnel *tunnel = NULL;
322
James Chapmancf3752e2008-03-05 18:39:08 -0800323 read_lock_bh(&pppol2tp_tunnel_list_lock);
James Chapman3557baa2007-06-27 15:49:24 -0700324 list_for_each_entry(tunnel, &pppol2tp_tunnel_list, list) {
325 if (tunnel->stats.tunnel_id == tunnel_id) {
James Chapmancf3752e2008-03-05 18:39:08 -0800326 read_unlock_bh(&pppol2tp_tunnel_list_lock);
James Chapman3557baa2007-06-27 15:49:24 -0700327 return tunnel;
328 }
329 }
James Chapmancf3752e2008-03-05 18:39:08 -0800330 read_unlock_bh(&pppol2tp_tunnel_list_lock);
James Chapman3557baa2007-06-27 15:49:24 -0700331
332 return NULL;
333}
334
335/*****************************************************************************
336 * Receive data handling
337 *****************************************************************************/
338
339/* Queue a skb in order. We come here only if the skb has an L2TP sequence
340 * number.
341 */
342static void pppol2tp_recv_queue_skb(struct pppol2tp_session *session, struct sk_buff *skb)
343{
344 struct sk_buff *skbp;
James Chapmane6531812008-03-05 18:40:01 -0800345 struct sk_buff *tmp;
James Chapman3557baa2007-06-27 15:49:24 -0700346 u16 ns = PPPOL2TP_SKB_CB(skb)->ns;
347
James Chapmancf3752e2008-03-05 18:39:08 -0800348 spin_lock_bh(&session->reorder_q.lock);
James Chapmane6531812008-03-05 18:40:01 -0800349 skb_queue_walk_safe(&session->reorder_q, skbp, tmp) {
James Chapman3557baa2007-06-27 15:49:24 -0700350 if (PPPOL2TP_SKB_CB(skbp)->ns > ns) {
351 __skb_insert(skb, skbp->prev, skbp, &session->reorder_q);
352 PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
353 "%s: pkt %hu, inserted before %hu, reorder_q len=%d\n",
354 session->name, ns, PPPOL2TP_SKB_CB(skbp)->ns,
355 skb_queue_len(&session->reorder_q));
356 session->stats.rx_oos_packets++;
357 goto out;
358 }
359 }
360
361 __skb_queue_tail(&session->reorder_q, skb);
362
363out:
James Chapmancf3752e2008-03-05 18:39:08 -0800364 spin_unlock_bh(&session->reorder_q.lock);
James Chapman3557baa2007-06-27 15:49:24 -0700365}
366
367/* Dequeue a single skb.
368 */
369static void pppol2tp_recv_dequeue_skb(struct pppol2tp_session *session, struct sk_buff *skb)
370{
371 struct pppol2tp_tunnel *tunnel = session->tunnel;
372 int length = PPPOL2TP_SKB_CB(skb)->length;
373 struct sock *session_sock = NULL;
374
James Chapmane6531812008-03-05 18:40:01 -0800375 /* We're about to requeue the skb, so return resources
James Chapman3557baa2007-06-27 15:49:24 -0700376 * to its current owner (a socket receive buffer).
377 */
James Chapman3557baa2007-06-27 15:49:24 -0700378 skb_orphan(skb);
379
380 tunnel->stats.rx_packets++;
381 tunnel->stats.rx_bytes += length;
382 session->stats.rx_packets++;
383 session->stats.rx_bytes += length;
384
385 if (PPPOL2TP_SKB_CB(skb)->has_seq) {
386 /* Bump our Nr */
387 session->nr++;
388 PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
389 "%s: updated nr to %hu\n", session->name, session->nr);
390 }
391
392 /* If the socket is bound, send it in to PPP's input queue. Otherwise
393 * queue it on the session socket.
394 */
395 session_sock = session->sock;
396 if (session_sock->sk_state & PPPOX_BOUND) {
397 struct pppox_sock *po;
398 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
399 "%s: recv %d byte data frame, passing to ppp\n",
400 session->name, length);
401
402 /* We need to forget all info related to the L2TP packet
403 * gathered in the skb as we are going to reuse the same
404 * skb for the inner packet.
405 * Namely we need to:
406 * - reset xfrm (IPSec) information as it applies to
407 * the outer L2TP packet and not to the inner one
408 * - release the dst to force a route lookup on the inner
409 * IP packet since skb->dst currently points to the dst
410 * of the UDP tunnel
411 * - reset netfilter information as it doesn't apply
412 * to the inner packet either
413 */
414 secpath_reset(skb);
415 dst_release(skb->dst);
416 skb->dst = NULL;
417 nf_reset(skb);
418
419 po = pppox_sk(session_sock);
420 ppp_input(&po->chan, skb);
421 } else {
422 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
423 "%s: socket not bound\n", session->name);
424
425 /* Not bound. Nothing we can do, so discard. */
426 session->stats.rx_errors++;
427 kfree_skb(skb);
428 }
429
430 sock_put(session->sock);
431}
432
433/* Dequeue skbs from the session's reorder_q, subject to packet order.
434 * Skbs that have been in the queue for too long are simply discarded.
435 */
436static void pppol2tp_recv_dequeue(struct pppol2tp_session *session)
437{
438 struct sk_buff *skb;
439 struct sk_buff *tmp;
440
441 /* If the pkt at the head of the queue has the nr that we
442 * expect to send up next, dequeue it and any other
443 * in-sequence packets behind it.
444 */
James Chapmancf3752e2008-03-05 18:39:08 -0800445 spin_lock_bh(&session->reorder_q.lock);
James Chapman3557baa2007-06-27 15:49:24 -0700446 skb_queue_walk_safe(&session->reorder_q, skb, tmp) {
447 if (time_after(jiffies, PPPOL2TP_SKB_CB(skb)->expires)) {
448 session->stats.rx_seq_discards++;
449 session->stats.rx_errors++;
450 PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
451 "%s: oos pkt %hu len %d discarded (too old), "
452 "waiting for %hu, reorder_q_len=%d\n",
453 session->name, PPPOL2TP_SKB_CB(skb)->ns,
454 PPPOL2TP_SKB_CB(skb)->length, session->nr,
455 skb_queue_len(&session->reorder_q));
456 __skb_unlink(skb, &session->reorder_q);
457 kfree_skb(skb);
Jarek Poplawskic8fff1c2008-03-03 20:48:53 -0800458 sock_put(session->sock);
James Chapman3557baa2007-06-27 15:49:24 -0700459 continue;
460 }
461
462 if (PPPOL2TP_SKB_CB(skb)->has_seq) {
463 if (PPPOL2TP_SKB_CB(skb)->ns != session->nr) {
464 PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
465 "%s: holding oos pkt %hu len %d, "
466 "waiting for %hu, reorder_q_len=%d\n",
467 session->name, PPPOL2TP_SKB_CB(skb)->ns,
468 PPPOL2TP_SKB_CB(skb)->length, session->nr,
469 skb_queue_len(&session->reorder_q));
470 goto out;
471 }
472 }
James Chapmane6531812008-03-05 18:40:01 -0800473 __skb_unlink(skb, &session->reorder_q);
474
475 /* Process the skb. We release the queue lock while we
476 * do so to let other contexts process the queue.
477 */
James Chapmancf3752e2008-03-05 18:39:08 -0800478 spin_unlock_bh(&session->reorder_q.lock);
James Chapman3557baa2007-06-27 15:49:24 -0700479 pppol2tp_recv_dequeue_skb(session, skb);
James Chapmancf3752e2008-03-05 18:39:08 -0800480 spin_lock_bh(&session->reorder_q.lock);
James Chapman3557baa2007-06-27 15:49:24 -0700481 }
482
483out:
James Chapmancf3752e2008-03-05 18:39:08 -0800484 spin_unlock_bh(&session->reorder_q.lock);
James Chapman3557baa2007-06-27 15:49:24 -0700485}
486
487/* Internal receive frame. Do the real work of receiving an L2TP data frame
488 * here. The skb is not on a list when we get here.
489 * Returns 0 if the packet was a data packet and was successfully passed on.
490 * Returns 1 if the packet was not a good data packet and could not be
491 * forwarded. All such packets are passed up to userspace to deal with.
492 */
493static int pppol2tp_recv_core(struct sock *sock, struct sk_buff *skb)
494{
495 struct pppol2tp_session *session = NULL;
496 struct pppol2tp_tunnel *tunnel;
James Chapman91781002007-11-05 23:32:37 -0800497 unsigned char *ptr, *optr;
James Chapman3557baa2007-06-27 15:49:24 -0700498 u16 hdrflags;
499 u16 tunnel_id, session_id;
500 int length;
Herbert Xu7a70e392007-09-18 13:18:42 -0700501 int offset;
James Chapman3557baa2007-06-27 15:49:24 -0700502
503 tunnel = pppol2tp_sock_to_tunnel(sock);
504 if (tunnel == NULL)
James Chapman91781002007-11-05 23:32:37 -0800505 goto no_tunnel;
James Chapman3557baa2007-06-27 15:49:24 -0700506
Herbert Xu7a70e392007-09-18 13:18:42 -0700507 /* UDP always verifies the packet length. */
508 __skb_pull(skb, sizeof(struct udphdr));
509
James Chapman3557baa2007-06-27 15:49:24 -0700510 /* Short packet? */
Herbert Xu7a70e392007-09-18 13:18:42 -0700511 if (!pskb_may_pull(skb, 12)) {
James Chapman3557baa2007-06-27 15:49:24 -0700512 PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
513 "%s: recv short packet (len=%d)\n", tunnel->name, skb->len);
514 goto error;
515 }
516
517 /* Point to L2TP header */
James Chapman91781002007-11-05 23:32:37 -0800518 optr = ptr = skb->data;
James Chapman3557baa2007-06-27 15:49:24 -0700519
520 /* Get L2TP header flags */
521 hdrflags = ntohs(*(__be16*)ptr);
522
523 /* Trace packet contents, if enabled */
524 if (tunnel->debug & PPPOL2TP_MSG_DATA) {
Herbert Xu7a70e392007-09-18 13:18:42 -0700525 length = min(16u, skb->len);
526 if (!pskb_may_pull(skb, length))
527 goto error;
528
James Chapman3557baa2007-06-27 15:49:24 -0700529 printk(KERN_DEBUG "%s: recv: ", tunnel->name);
530
Herbert Xu7a70e392007-09-18 13:18:42 -0700531 offset = 0;
532 do {
533 printk(" %02X", ptr[offset]);
534 } while (++offset < length);
535
James Chapman3557baa2007-06-27 15:49:24 -0700536 printk("\n");
537 }
538
539 /* Get length of L2TP packet */
Herbert Xu7a70e392007-09-18 13:18:42 -0700540 length = skb->len;
James Chapman3557baa2007-06-27 15:49:24 -0700541
542 /* If type is control packet, it is handled by userspace. */
543 if (hdrflags & L2TP_HDRFLAG_T) {
544 PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
545 "%s: recv control packet, len=%d\n", tunnel->name, length);
546 goto error;
547 }
548
549 /* Skip flags */
550 ptr += 2;
551
552 /* If length is present, skip it */
553 if (hdrflags & L2TP_HDRFLAG_L)
554 ptr += 2;
555
556 /* Extract tunnel and session ID */
557 tunnel_id = ntohs(*(__be16 *) ptr);
558 ptr += 2;
559 session_id = ntohs(*(__be16 *) ptr);
560 ptr += 2;
561
562 /* Find the session context */
563 session = pppol2tp_session_find(tunnel, session_id);
564 if (!session) {
565 /* Not found? Pass to userspace to deal with */
566 PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_INFO,
567 "%s: no socket found (%hu/%hu). Passing up.\n",
568 tunnel->name, tunnel_id, session_id);
569 goto error;
570 }
571 sock_hold(session->sock);
572
573 /* The ref count on the socket was increased by the above call since
574 * we now hold a pointer to the session. Take care to do sock_put()
575 * when exiting this function from now on...
576 */
577
578 /* Handle the optional sequence numbers. If we are the LAC,
579 * enable/disable sequence numbers under the control of the LNS. If
580 * no sequence numbers present but we were expecting them, discard
581 * frame.
582 */
583 if (hdrflags & L2TP_HDRFLAG_S) {
584 u16 ns, nr;
585 ns = ntohs(*(__be16 *) ptr);
586 ptr += 2;
587 nr = ntohs(*(__be16 *) ptr);
588 ptr += 2;
589
590 /* Received a packet with sequence numbers. If we're the LNS,
591 * check if we sre sending sequence numbers and if not,
592 * configure it so.
593 */
594 if ((!session->lns_mode) && (!session->send_seq)) {
595 PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_INFO,
596 "%s: requested to enable seq numbers by LNS\n",
597 session->name);
598 session->send_seq = -1;
599 }
600
601 /* Store L2TP info in the skb */
602 PPPOL2TP_SKB_CB(skb)->ns = ns;
603 PPPOL2TP_SKB_CB(skb)->nr = nr;
604 PPPOL2TP_SKB_CB(skb)->has_seq = 1;
605
606 PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
607 "%s: recv data ns=%hu, nr=%hu, session nr=%hu\n",
608 session->name, ns, nr, session->nr);
609 } else {
610 /* No sequence numbers.
611 * If user has configured mandatory sequence numbers, discard.
612 */
613 if (session->recv_seq) {
614 PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_WARNING,
615 "%s: recv data has no seq numbers when required. "
616 "Discarding\n", session->name);
617 session->stats.rx_seq_discards++;
James Chapman3557baa2007-06-27 15:49:24 -0700618 goto discard;
619 }
620
621 /* If we're the LAC and we're sending sequence numbers, the
622 * LNS has requested that we no longer send sequence numbers.
623 * If we're the LNS and we're sending sequence numbers, the
624 * LAC is broken. Discard the frame.
625 */
626 if ((!session->lns_mode) && (session->send_seq)) {
627 PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_INFO,
628 "%s: requested to disable seq numbers by LNS\n",
629 session->name);
630 session->send_seq = 0;
631 } else if (session->send_seq) {
632 PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_WARNING,
633 "%s: recv data has no seq numbers when required. "
634 "Discarding\n", session->name);
635 session->stats.rx_seq_discards++;
James Chapman3557baa2007-06-27 15:49:24 -0700636 goto discard;
637 }
638
639 /* Store L2TP info in the skb */
640 PPPOL2TP_SKB_CB(skb)->has_seq = 0;
641 }
642
643 /* If offset bit set, skip it. */
Herbert Xu7a70e392007-09-18 13:18:42 -0700644 if (hdrflags & L2TP_HDRFLAG_O) {
645 offset = ntohs(*(__be16 *)ptr);
James Chapman91781002007-11-05 23:32:37 -0800646 ptr += 2 + offset;
Herbert Xu7a70e392007-09-18 13:18:42 -0700647 }
James Chapman3557baa2007-06-27 15:49:24 -0700648
James Chapman91781002007-11-05 23:32:37 -0800649 offset = ptr - optr;
650 if (!pskb_may_pull(skb, offset))
651 goto discard;
652
653 __skb_pull(skb, offset);
James Chapman3557baa2007-06-27 15:49:24 -0700654
655 /* Skip PPP header, if present. In testing, Microsoft L2TP clients
656 * don't send the PPP header (PPP header compression enabled), but
657 * other clients can include the header. So we cope with both cases
658 * here. The PPP header is always FF03 when using L2TP.
659 *
660 * Note that skb->data[] isn't dereferenced from a u16 ptr here since
661 * the field may be unaligned.
662 */
James Chapman91781002007-11-05 23:32:37 -0800663 if (!pskb_may_pull(skb, 2))
664 goto discard;
665
James Chapman3557baa2007-06-27 15:49:24 -0700666 if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03))
667 skb_pull(skb, 2);
668
669 /* Prepare skb for adding to the session's reorder_q. Hold
670 * packets for max reorder_timeout or 1 second if not
671 * reordering.
672 */
673 PPPOL2TP_SKB_CB(skb)->length = length;
674 PPPOL2TP_SKB_CB(skb)->expires = jiffies +
675 (session->reorder_timeout ? session->reorder_timeout : HZ);
676
677 /* Add packet to the session's receive queue. Reordering is done here, if
678 * enabled. Saved L2TP protocol info is stored in skb->sb[].
679 */
680 if (PPPOL2TP_SKB_CB(skb)->has_seq) {
681 if (session->reorder_timeout != 0) {
682 /* Packet reordering enabled. Add skb to session's
683 * reorder queue, in order of ns.
684 */
685 pppol2tp_recv_queue_skb(session, skb);
686 } else {
687 /* Packet reordering disabled. Discard out-of-sequence
688 * packets
689 */
690 if (PPPOL2TP_SKB_CB(skb)->ns != session->nr) {
691 session->stats.rx_seq_discards++;
James Chapman3557baa2007-06-27 15:49:24 -0700692 PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
693 "%s: oos pkt %hu len %d discarded, "
694 "waiting for %hu, reorder_q_len=%d\n",
695 session->name, PPPOL2TP_SKB_CB(skb)->ns,
696 PPPOL2TP_SKB_CB(skb)->length, session->nr,
697 skb_queue_len(&session->reorder_q));
698 goto discard;
699 }
700 skb_queue_tail(&session->reorder_q, skb);
701 }
702 } else {
703 /* No sequence numbers. Add the skb to the tail of the
704 * reorder queue. This ensures that it will be
705 * delivered after all previous sequenced skbs.
706 */
707 skb_queue_tail(&session->reorder_q, skb);
708 }
709
710 /* Try to dequeue as many skbs from reorder_q as we can. */
711 pppol2tp_recv_dequeue(session);
712
713 return 0;
714
715discard:
Herbert Xu7a70e392007-09-18 13:18:42 -0700716 session->stats.rx_errors++;
James Chapman3557baa2007-06-27 15:49:24 -0700717 kfree_skb(skb);
718 sock_put(session->sock);
719
720 return 0;
721
722error:
James Chapman91781002007-11-05 23:32:37 -0800723 /* Put UDP header back */
724 __skb_push(skb, sizeof(struct udphdr));
725
726no_tunnel:
James Chapman3557baa2007-06-27 15:49:24 -0700727 return 1;
728}
729
730/* UDP encapsulation receive handler. See net/ipv4/udp.c.
731 * Return codes:
732 * 0 : success.
733 * <0: error
734 * >0: skb should be passed up to userspace as UDP.
735 */
736static int pppol2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
737{
738 struct pppol2tp_tunnel *tunnel;
739
740 tunnel = pppol2tp_sock_to_tunnel(sk);
741 if (tunnel == NULL)
742 goto pass_up;
743
744 PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
745 "%s: received %d bytes\n", tunnel->name, skb->len);
746
747 if (pppol2tp_recv_core(sk, skb))
748 goto pass_up;
749
750 return 0;
751
752pass_up:
753 return 1;
754}
755
756/* Receive message. This is the recvmsg for the PPPoL2TP socket.
757 */
758static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock,
759 struct msghdr *msg, size_t len,
760 int flags)
761{
762 int err;
763 struct sk_buff *skb;
764 struct sock *sk = sock->sk;
765
766 err = -EIO;
767 if (sk->sk_state & PPPOX_BOUND)
768 goto end;
769
770 msg->msg_namelen = 0;
771
772 err = 0;
773 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
774 flags & MSG_DONTWAIT, &err);
775 if (skb) {
776 err = memcpy_toiovec(msg->msg_iov, (unsigned char *) skb->data,
777 skb->len);
778 if (err < 0)
779 goto do_skb_free;
780 err = skb->len;
781 }
782do_skb_free:
783 kfree_skb(skb);
784end:
785 return err;
786}
787
788/************************************************************************
789 * Transmit handling
790 ***********************************************************************/
791
792/* Tell how big L2TP headers are for a particular session. This
793 * depends on whether sequence numbers are being used.
794 */
795static inline int pppol2tp_l2tp_header_len(struct pppol2tp_session *session)
796{
797 if (session->send_seq)
798 return PPPOL2TP_L2TP_HDR_SIZE_SEQ;
799
800 return PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
801}
802
803/* Build an L2TP header for the session into the buffer provided.
804 */
805static void pppol2tp_build_l2tp_header(struct pppol2tp_session *session,
806 void *buf)
807{
808 __be16 *bufp = buf;
809 u16 flags = L2TP_HDR_VER;
810
811 if (session->send_seq)
812 flags |= L2TP_HDRFLAG_S;
813
814 /* Setup L2TP header.
815 * FIXME: Can this ever be unaligned? Is direct dereferencing of
816 * 16-bit header fields safe here for all architectures?
817 */
818 *bufp++ = htons(flags);
819 *bufp++ = htons(session->tunnel_addr.d_tunnel);
820 *bufp++ = htons(session->tunnel_addr.d_session);
821 if (session->send_seq) {
822 *bufp++ = htons(session->ns);
823 *bufp++ = 0;
824 session->ns++;
825 PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG,
826 "%s: updated ns to %hu\n", session->name, session->ns);
827 }
828}
829
830/* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
831 * when a user application does a sendmsg() on the session socket. L2TP and
832 * PPP headers must be inserted into the user's data.
833 */
834static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
835 size_t total_len)
836{
837 static const unsigned char ppph[2] = { 0xff, 0x03 };
838 struct sock *sk = sock->sk;
839 struct inet_sock *inet;
840 __wsum csum = 0;
841 struct sk_buff *skb;
842 int error;
843 int hdr_len;
844 struct pppol2tp_session *session;
845 struct pppol2tp_tunnel *tunnel;
846 struct udphdr *uh;
Patrick McHardy7d4372b2007-07-18 02:04:09 -0700847 unsigned int len;
James Chapman3557baa2007-06-27 15:49:24 -0700848
849 error = -ENOTCONN;
850 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
851 goto error;
852
853 /* Get session and tunnel contexts */
854 error = -EBADF;
855 session = pppol2tp_sock_to_session(sk);
856 if (session == NULL)
857 goto error;
858
859 tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock);
860 if (tunnel == NULL)
861 goto error;
862
863 /* What header length is configured for this session? */
864 hdr_len = pppol2tp_l2tp_header_len(session);
865
866 /* Allocate a socket buffer */
867 error = -ENOMEM;
868 skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) +
869 sizeof(struct udphdr) + hdr_len +
870 sizeof(ppph) + total_len,
871 0, GFP_KERNEL);
872 if (!skb)
873 goto error;
874
875 /* Reserve space for headers. */
876 skb_reserve(skb, NET_SKB_PAD);
877 skb_reset_network_header(skb);
878 skb_reserve(skb, sizeof(struct iphdr));
879 skb_reset_transport_header(skb);
880
881 /* Build UDP header */
882 inet = inet_sk(session->tunnel_sock);
883 uh = (struct udphdr *) skb->data;
884 uh->source = inet->sport;
885 uh->dest = inet->dport;
886 uh->len = htons(hdr_len + sizeof(ppph) + total_len);
887 uh->check = 0;
888 skb_put(skb, sizeof(struct udphdr));
889
890 /* Build L2TP header */
891 pppol2tp_build_l2tp_header(session, skb->data);
892 skb_put(skb, hdr_len);
893
894 /* Add PPP header */
895 skb->data[0] = ppph[0];
896 skb->data[1] = ppph[1];
897 skb_put(skb, 2);
898
899 /* Copy user data into skb */
900 error = memcpy_fromiovec(skb->data, m->msg_iov, total_len);
901 if (error < 0) {
902 kfree_skb(skb);
903 goto error;
904 }
905 skb_put(skb, total_len);
906
907 /* Calculate UDP checksum if configured to do so */
908 if (session->tunnel_sock->sk_no_check != UDP_CSUM_NOXMIT)
909 csum = udp_csum_outgoing(sk, skb);
910
911 /* Debug */
912 if (session->send_seq)
913 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
David S. Miller38d15b62007-06-27 15:52:25 -0700914 "%s: send %Zd bytes, ns=%hu\n", session->name,
James Chapman3557baa2007-06-27 15:49:24 -0700915 total_len, session->ns - 1);
916 else
917 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
David S. Miller38d15b62007-06-27 15:52:25 -0700918 "%s: send %Zd bytes\n", session->name, total_len);
James Chapman3557baa2007-06-27 15:49:24 -0700919
920 if (session->debug & PPPOL2TP_MSG_DATA) {
921 int i;
922 unsigned char *datap = skb->data;
923
924 printk(KERN_DEBUG "%s: xmit:", session->name);
925 for (i = 0; i < total_len; i++) {
926 printk(" %02X", *datap++);
927 if (i == 15) {
928 printk(" ...");
929 break;
930 }
931 }
932 printk("\n");
933 }
934
935 /* Queue the packet to IP for output */
Patrick McHardy7d4372b2007-07-18 02:04:09 -0700936 len = skb->len;
James Chapman3557baa2007-06-27 15:49:24 -0700937 error = ip_queue_xmit(skb, 1);
938
939 /* Update stats */
940 if (error >= 0) {
941 tunnel->stats.tx_packets++;
Patrick McHardy7d4372b2007-07-18 02:04:09 -0700942 tunnel->stats.tx_bytes += len;
James Chapman3557baa2007-06-27 15:49:24 -0700943 session->stats.tx_packets++;
Patrick McHardy7d4372b2007-07-18 02:04:09 -0700944 session->stats.tx_bytes += len;
James Chapman3557baa2007-06-27 15:49:24 -0700945 } else {
946 tunnel->stats.tx_errors++;
947 session->stats.tx_errors++;
948 }
949
950error:
951 return error;
952}
953
954/* Transmit function called by generic PPP driver. Sends PPP frame
955 * over PPPoL2TP socket.
956 *
957 * This is almost the same as pppol2tp_sendmsg(), but rather than
958 * being called with a msghdr from userspace, it is called with a skb
959 * from the kernel.
960 *
961 * The supplied skb from ppp doesn't have enough headroom for the
962 * insertion of L2TP, UDP and IP headers so we need to allocate more
963 * headroom in the skb. This will create a cloned skb. But we must be
964 * careful in the error case because the caller will expect to free
965 * the skb it supplied, not our cloned skb. So we take care to always
966 * leave the original skb unfreed if we return an error.
967 */
968static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
969{
970 static const u8 ppph[2] = { 0xff, 0x03 };
971 struct sock *sk = (struct sock *) chan->private;
972 struct sock *sk_tun;
973 int hdr_len;
974 struct pppol2tp_session *session;
975 struct pppol2tp_tunnel *tunnel;
976 int rc;
977 int headroom;
978 int data_len = skb->len;
979 struct inet_sock *inet;
980 __wsum csum = 0;
James Chapman3557baa2007-06-27 15:49:24 -0700981 struct udphdr *uh;
Patrick McHardy7d4372b2007-07-18 02:04:09 -0700982 unsigned int len;
James Chapman3557baa2007-06-27 15:49:24 -0700983
984 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
985 goto abort;
986
987 /* Get session and tunnel contexts from the socket */
988 session = pppol2tp_sock_to_session(sk);
989 if (session == NULL)
990 goto abort;
991
992 sk_tun = session->tunnel_sock;
993 if (sk_tun == NULL)
994 goto abort;
995 tunnel = pppol2tp_sock_to_tunnel(sk_tun);
996 if (tunnel == NULL)
997 goto abort;
998
999 /* What header length is configured for this session? */
1000 hdr_len = pppol2tp_l2tp_header_len(session);
1001
1002 /* Check that there's enough headroom in the skb to insert IP,
1003 * UDP and L2TP and PPP headers. If not enough, expand it to
1004 * make room. Note that a new skb (or a clone) is
1005 * allocated. If we return an error from this point on, make
1006 * sure we free the new skb but do not free the original skb
1007 * since that is done by the caller for the error case.
1008 */
1009 headroom = NET_SKB_PAD + sizeof(struct iphdr) +
1010 sizeof(struct udphdr) + hdr_len + sizeof(ppph);
Herbert Xuf3d5e3a2007-09-19 10:46:28 -07001011 if (skb_cow_head(skb, headroom))
1012 goto abort;
James Chapman3557baa2007-06-27 15:49:24 -07001013
1014 /* Setup PPP header */
Herbert Xuf3d5e3a2007-09-19 10:46:28 -07001015 __skb_push(skb, sizeof(ppph));
1016 skb->data[0] = ppph[0];
1017 skb->data[1] = ppph[1];
James Chapman3557baa2007-06-27 15:49:24 -07001018
1019 /* Setup L2TP header */
Herbert Xuf3d5e3a2007-09-19 10:46:28 -07001020 pppol2tp_build_l2tp_header(session, __skb_push(skb, hdr_len));
James Chapman3557baa2007-06-27 15:49:24 -07001021
1022 /* Setup UDP header */
1023 inet = inet_sk(sk_tun);
Herbert Xuf3d5e3a2007-09-19 10:46:28 -07001024 __skb_push(skb, sizeof(*uh));
1025 skb_reset_transport_header(skb);
1026 uh = udp_hdr(skb);
James Chapman3557baa2007-06-27 15:49:24 -07001027 uh->source = inet->sport;
1028 uh->dest = inet->dport;
1029 uh->len = htons(sizeof(struct udphdr) + hdr_len + sizeof(ppph) + data_len);
1030 uh->check = 0;
1031
Herbert Xuf3d5e3a2007-09-19 10:46:28 -07001032 /* *BROKEN* Calculate UDP checksum if configured to do so */
James Chapman3557baa2007-06-27 15:49:24 -07001033 if (sk_tun->sk_no_check != UDP_CSUM_NOXMIT)
Herbert Xuf3d5e3a2007-09-19 10:46:28 -07001034 csum = udp_csum_outgoing(sk_tun, skb);
James Chapman3557baa2007-06-27 15:49:24 -07001035
1036 /* Debug */
1037 if (session->send_seq)
1038 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
1039 "%s: send %d bytes, ns=%hu\n", session->name,
1040 data_len, session->ns - 1);
1041 else
1042 PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG,
1043 "%s: send %d bytes\n", session->name, data_len);
1044
1045 if (session->debug & PPPOL2TP_MSG_DATA) {
1046 int i;
Herbert Xuf3d5e3a2007-09-19 10:46:28 -07001047 unsigned char *datap = skb->data;
James Chapman3557baa2007-06-27 15:49:24 -07001048
1049 printk(KERN_DEBUG "%s: xmit:", session->name);
1050 for (i = 0; i < data_len; i++) {
1051 printk(" %02X", *datap++);
1052 if (i == 31) {
1053 printk(" ...");
1054 break;
1055 }
1056 }
1057 printk("\n");
1058 }
1059
Herbert Xuf3d5e3a2007-09-19 10:46:28 -07001060 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1061 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
1062 IPSKB_REROUTED);
1063 nf_reset(skb);
Patrick McHardyf77ae932007-07-18 02:04:39 -07001064
James Chapman3557baa2007-06-27 15:49:24 -07001065 /* Get routing info from the tunnel socket */
Herbert Xuf3d5e3a2007-09-19 10:46:28 -07001066 dst_release(skb->dst);
James Chapmancf3752e2008-03-05 18:39:08 -08001067 skb->dst = dst_clone(__sk_dst_get(sk_tun));
James Chapman91781002007-11-05 23:32:37 -08001068 skb_orphan(skb);
1069 skb->sk = sk_tun;
James Chapman3557baa2007-06-27 15:49:24 -07001070
1071 /* Queue the packet to IP for output */
Herbert Xuf3d5e3a2007-09-19 10:46:28 -07001072 len = skb->len;
1073 rc = ip_queue_xmit(skb, 1);
James Chapman3557baa2007-06-27 15:49:24 -07001074
1075 /* Update stats */
1076 if (rc >= 0) {
1077 tunnel->stats.tx_packets++;
Patrick McHardy7d4372b2007-07-18 02:04:09 -07001078 tunnel->stats.tx_bytes += len;
James Chapman3557baa2007-06-27 15:49:24 -07001079 session->stats.tx_packets++;
Patrick McHardy7d4372b2007-07-18 02:04:09 -07001080 session->stats.tx_bytes += len;
James Chapman3557baa2007-06-27 15:49:24 -07001081 } else {
1082 tunnel->stats.tx_errors++;
1083 session->stats.tx_errors++;
1084 }
1085
James Chapman3557baa2007-06-27 15:49:24 -07001086 return 1;
1087
James Chapman3557baa2007-06-27 15:49:24 -07001088abort:
Herbert Xuf3d5e3a2007-09-19 10:46:28 -07001089 /* Free the original skb */
1090 kfree_skb(skb);
1091 return 1;
James Chapman3557baa2007-06-27 15:49:24 -07001092}
1093
1094/*****************************************************************************
1095 * Session (and tunnel control) socket create/destroy.
1096 *****************************************************************************/
1097
1098/* When the tunnel UDP socket is closed, all the attached sockets need to go
1099 * too.
1100 */
1101static void pppol2tp_tunnel_closeall(struct pppol2tp_tunnel *tunnel)
1102{
1103 int hash;
1104 struct hlist_node *walk;
1105 struct hlist_node *tmp;
1106 struct pppol2tp_session *session;
1107 struct sock *sk;
1108
1109 if (tunnel == NULL)
1110 BUG();
1111
1112 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1113 "%s: closing all sessions...\n", tunnel->name);
1114
James Chapmancf3752e2008-03-05 18:39:08 -08001115 write_lock_bh(&tunnel->hlist_lock);
James Chapman3557baa2007-06-27 15:49:24 -07001116 for (hash = 0; hash < PPPOL2TP_HASH_SIZE; hash++) {
1117again:
1118 hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) {
Jarek Poplawskiec9b6ad2008-03-03 20:49:34 -08001119 struct sk_buff *skb;
1120
James Chapman3557baa2007-06-27 15:49:24 -07001121 session = hlist_entry(walk, struct pppol2tp_session, hlist);
1122
1123 sk = session->sock;
1124
1125 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1126 "%s: closing session\n", session->name);
1127
1128 hlist_del_init(&session->hlist);
1129
1130 /* Since we should hold the sock lock while
1131 * doing any unbinding, we need to release the
1132 * lock we're holding before taking that lock.
1133 * Hold a reference to the sock so it doesn't
1134 * disappear as we're jumping between locks.
1135 */
1136 sock_hold(sk);
James Chapmancf3752e2008-03-05 18:39:08 -08001137 write_unlock_bh(&tunnel->hlist_lock);
James Chapman3557baa2007-06-27 15:49:24 -07001138 lock_sock(sk);
1139
1140 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
1141 pppox_unbind_sock(sk);
1142 sk->sk_state = PPPOX_DEAD;
1143 sk->sk_state_change(sk);
1144 }
1145
1146 /* Purge any queued data */
1147 skb_queue_purge(&sk->sk_receive_queue);
1148 skb_queue_purge(&sk->sk_write_queue);
Jarek Poplawskiec9b6ad2008-03-03 20:49:34 -08001149 while ((skb = skb_dequeue(&session->reorder_q))) {
1150 kfree_skb(skb);
1151 sock_put(sk);
1152 }
James Chapman3557baa2007-06-27 15:49:24 -07001153
1154 release_sock(sk);
1155 sock_put(sk);
1156
1157 /* Now restart from the beginning of this hash
1158 * chain. We always remove a session from the
1159 * list so we are guaranteed to make forward
1160 * progress.
1161 */
James Chapmancf3752e2008-03-05 18:39:08 -08001162 write_lock_bh(&tunnel->hlist_lock);
James Chapman3557baa2007-06-27 15:49:24 -07001163 goto again;
1164 }
1165 }
James Chapmancf3752e2008-03-05 18:39:08 -08001166 write_unlock_bh(&tunnel->hlist_lock);
James Chapman3557baa2007-06-27 15:49:24 -07001167}
1168
1169/* Really kill the tunnel.
1170 * Come here only when all sessions have been cleared from the tunnel.
1171 */
1172static void pppol2tp_tunnel_free(struct pppol2tp_tunnel *tunnel)
1173{
1174 /* Remove from socket list */
James Chapmancf3752e2008-03-05 18:39:08 -08001175 write_lock_bh(&pppol2tp_tunnel_list_lock);
James Chapman3557baa2007-06-27 15:49:24 -07001176 list_del_init(&tunnel->list);
James Chapmancf3752e2008-03-05 18:39:08 -08001177 write_unlock_bh(&pppol2tp_tunnel_list_lock);
James Chapman3557baa2007-06-27 15:49:24 -07001178
1179 atomic_dec(&pppol2tp_tunnel_count);
1180 kfree(tunnel);
1181}
1182
1183/* Tunnel UDP socket destruct hook.
1184 * The tunnel context is deleted only when all session sockets have been
1185 * closed.
1186 */
1187static void pppol2tp_tunnel_destruct(struct sock *sk)
1188{
1189 struct pppol2tp_tunnel *tunnel;
1190
1191 tunnel = pppol2tp_sock_to_tunnel(sk);
1192 if (tunnel == NULL)
1193 goto end;
1194
1195 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1196 "%s: closing...\n", tunnel->name);
1197
1198 /* Close all sessions */
1199 pppol2tp_tunnel_closeall(tunnel);
1200
1201 /* No longer an encapsulation socket. See net/ipv4/udp.c */
1202 (udp_sk(sk))->encap_type = 0;
1203 (udp_sk(sk))->encap_rcv = NULL;
1204
1205 /* Remove hooks into tunnel socket */
1206 tunnel->sock = NULL;
1207 sk->sk_destruct = tunnel->old_sk_destruct;
1208 sk->sk_user_data = NULL;
1209
1210 /* Call original (UDP) socket descructor */
1211 if (sk->sk_destruct != NULL)
1212 (*sk->sk_destruct)(sk);
1213
1214 pppol2tp_tunnel_dec_refcount(tunnel);
1215
1216end:
1217 return;
1218}
1219
1220/* Really kill the session socket. (Called from sock_put() if
1221 * refcnt == 0.)
1222 */
1223static void pppol2tp_session_destruct(struct sock *sk)
1224{
1225 struct pppol2tp_session *session = NULL;
1226
1227 if (sk->sk_user_data != NULL) {
1228 struct pppol2tp_tunnel *tunnel;
1229
1230 session = pppol2tp_sock_to_session(sk);
1231 if (session == NULL)
1232 goto out;
1233
1234 /* Don't use pppol2tp_sock_to_tunnel() here to
1235 * get the tunnel context because the tunnel
1236 * socket might have already been closed (its
1237 * sk->sk_user_data will be NULL) so use the
1238 * session's private tunnel ptr instead.
1239 */
1240 tunnel = session->tunnel;
1241 if (tunnel != NULL) {
1242 BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);
1243
1244 /* If session_id is zero, this is a null
1245 * session context, which was created for a
1246 * socket that is being used only to manage
1247 * tunnels.
1248 */
1249 if (session->tunnel_addr.s_session != 0) {
1250 /* Delete the session socket from the
1251 * hash
1252 */
James Chapmancf3752e2008-03-05 18:39:08 -08001253 write_lock_bh(&tunnel->hlist_lock);
James Chapman3557baa2007-06-27 15:49:24 -07001254 hlist_del_init(&session->hlist);
James Chapmancf3752e2008-03-05 18:39:08 -08001255 write_unlock_bh(&tunnel->hlist_lock);
James Chapman3557baa2007-06-27 15:49:24 -07001256
1257 atomic_dec(&pppol2tp_session_count);
1258 }
1259
1260 /* This will delete the tunnel context if this
1261 * is the last session on the tunnel.
1262 */
1263 session->tunnel = NULL;
1264 session->tunnel_sock = NULL;
1265 pppol2tp_tunnel_dec_refcount(tunnel);
1266 }
1267 }
1268
1269 kfree(session);
1270out:
1271 return;
1272}
1273
1274/* Called when the PPPoX socket (session) is closed.
1275 */
1276static int pppol2tp_release(struct socket *sock)
1277{
1278 struct sock *sk = sock->sk;
1279 int error;
1280
1281 if (!sk)
1282 return 0;
1283
1284 error = -EBADF;
1285 lock_sock(sk);
1286 if (sock_flag(sk, SOCK_DEAD) != 0)
1287 goto error;
1288
1289 pppox_unbind_sock(sk);
1290
1291 /* Signal the death of the socket. */
1292 sk->sk_state = PPPOX_DEAD;
1293 sock_orphan(sk);
1294 sock->sk = NULL;
1295
1296 /* Purge any queued data */
1297 skb_queue_purge(&sk->sk_receive_queue);
1298 skb_queue_purge(&sk->sk_write_queue);
1299
1300 release_sock(sk);
1301
1302 /* This will delete the session context via
1303 * pppol2tp_session_destruct() if the socket's refcnt drops to
1304 * zero.
1305 */
1306 sock_put(sk);
1307
1308 return 0;
1309
1310error:
1311 release_sock(sk);
1312 return error;
1313}
1314
1315/* Internal function to prepare a tunnel (UDP) socket to have PPPoX
1316 * sockets attached to it.
1317 */
1318static struct sock *pppol2tp_prepare_tunnel_socket(int fd, u16 tunnel_id,
1319 int *error)
1320{
1321 int err;
1322 struct socket *sock = NULL;
1323 struct sock *sk;
1324 struct pppol2tp_tunnel *tunnel;
1325 struct sock *ret = NULL;
1326
1327 /* Get the tunnel UDP socket from the fd, which was opened by
1328 * the userspace L2TP daemon.
1329 */
1330 err = -EBADF;
1331 sock = sockfd_lookup(fd, &err);
1332 if (!sock) {
1333 PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR,
1334 "tunl %hu: sockfd_lookup(fd=%d) returned %d\n",
1335 tunnel_id, fd, err);
1336 goto err;
1337 }
1338
Herbert Xua14d6ab2007-09-18 13:18:17 -07001339 sk = sock->sk;
1340
James Chapman3557baa2007-06-27 15:49:24 -07001341 /* Quick sanity checks */
Herbert Xua14d6ab2007-09-18 13:18:17 -07001342 err = -EPROTONOSUPPORT;
1343 if (sk->sk_protocol != IPPROTO_UDP) {
James Chapman3557baa2007-06-27 15:49:24 -07001344 PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR,
Herbert Xua14d6ab2007-09-18 13:18:17 -07001345 "tunl %hu: fd %d wrong protocol, got %d, expected %d\n",
1346 tunnel_id, fd, sk->sk_protocol, IPPROTO_UDP);
James Chapman3557baa2007-06-27 15:49:24 -07001347 goto err;
1348 }
1349 err = -EAFNOSUPPORT;
1350 if (sock->ops->family != AF_INET) {
1351 PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR,
1352 "tunl %hu: fd %d wrong family, got %d, expected %d\n",
1353 tunnel_id, fd, sock->ops->family, AF_INET);
1354 goto err;
1355 }
1356
1357 err = -ENOTCONN;
James Chapman3557baa2007-06-27 15:49:24 -07001358
1359 /* Check if this socket has already been prepped */
1360 tunnel = (struct pppol2tp_tunnel *)sk->sk_user_data;
1361 if (tunnel != NULL) {
1362 /* User-data field already set */
1363 err = -EBUSY;
1364 BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);
1365
1366 /* This socket has already been prepped */
1367 ret = tunnel->sock;
1368 goto out;
1369 }
1370
1371 /* This socket is available and needs prepping. Create a new tunnel
1372 * context and init it.
1373 */
1374 sk->sk_user_data = tunnel = kzalloc(sizeof(struct pppol2tp_tunnel), GFP_KERNEL);
1375 if (sk->sk_user_data == NULL) {
1376 err = -ENOMEM;
1377 goto err;
1378 }
1379
1380 tunnel->magic = L2TP_TUNNEL_MAGIC;
1381 sprintf(&tunnel->name[0], "tunl %hu", tunnel_id);
1382
1383 tunnel->stats.tunnel_id = tunnel_id;
1384 tunnel->debug = PPPOL2TP_DEFAULT_DEBUG_FLAGS;
1385
1386 /* Hook on the tunnel socket destructor so that we can cleanup
1387 * if the tunnel socket goes away.
1388 */
1389 tunnel->old_sk_destruct = sk->sk_destruct;
1390 sk->sk_destruct = &pppol2tp_tunnel_destruct;
1391
1392 tunnel->sock = sk;
1393 sk->sk_allocation = GFP_ATOMIC;
1394
1395 /* Misc init */
1396 rwlock_init(&tunnel->hlist_lock);
1397
1398 /* Add tunnel to our list */
1399 INIT_LIST_HEAD(&tunnel->list);
James Chapmancf3752e2008-03-05 18:39:08 -08001400 write_lock_bh(&pppol2tp_tunnel_list_lock);
James Chapman3557baa2007-06-27 15:49:24 -07001401 list_add(&tunnel->list, &pppol2tp_tunnel_list);
James Chapmancf3752e2008-03-05 18:39:08 -08001402 write_unlock_bh(&pppol2tp_tunnel_list_lock);
James Chapman3557baa2007-06-27 15:49:24 -07001403 atomic_inc(&pppol2tp_tunnel_count);
1404
1405 /* Bump the reference count. The tunnel context is deleted
1406 * only when this drops to zero.
1407 */
1408 pppol2tp_tunnel_inc_refcount(tunnel);
1409
1410 /* Mark socket as an encapsulation socket. See net/ipv4/udp.c */
1411 (udp_sk(sk))->encap_type = UDP_ENCAP_L2TPINUDP;
1412 (udp_sk(sk))->encap_rcv = pppol2tp_udp_encap_recv;
1413
1414 ret = tunnel->sock;
1415
1416 *error = 0;
1417out:
1418 if (sock)
1419 sockfd_put(sock);
1420
1421 return ret;
1422
1423err:
1424 *error = err;
1425 goto out;
1426}
1427
1428static struct proto pppol2tp_sk_proto = {
1429 .name = "PPPOL2TP",
1430 .owner = THIS_MODULE,
1431 .obj_size = sizeof(struct pppox_sock),
1432};
1433
1434/* socket() handler. Initialize a new struct sock.
1435 */
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001436static int pppol2tp_create(struct net *net, struct socket *sock)
James Chapman3557baa2007-06-27 15:49:24 -07001437{
1438 int error = -ENOMEM;
1439 struct sock *sk;
1440
Pavel Emelyanov6257ff22007-11-01 00:39:31 -07001441 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto);
James Chapman3557baa2007-06-27 15:49:24 -07001442 if (!sk)
1443 goto out;
1444
1445 sock_init_data(sock, sk);
1446
1447 sock->state = SS_UNCONNECTED;
1448 sock->ops = &pppol2tp_ops;
1449
1450 sk->sk_backlog_rcv = pppol2tp_recv_core;
1451 sk->sk_protocol = PX_PROTO_OL2TP;
1452 sk->sk_family = PF_PPPOX;
1453 sk->sk_state = PPPOX_NONE;
1454 sk->sk_type = SOCK_STREAM;
1455 sk->sk_destruct = pppol2tp_session_destruct;
1456
1457 error = 0;
1458
1459out:
1460 return error;
1461}
1462
1463/* connect() handler. Attach a PPPoX socket to a tunnel UDP socket
1464 */
1465static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
1466 int sockaddr_len, int flags)
1467{
1468 struct sock *sk = sock->sk;
1469 struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
1470 struct pppox_sock *po = pppox_sk(sk);
1471 struct sock *tunnel_sock = NULL;
1472 struct pppol2tp_session *session = NULL;
1473 struct pppol2tp_tunnel *tunnel;
1474 struct dst_entry *dst;
1475 int error = 0;
1476
1477 lock_sock(sk);
1478
1479 error = -EINVAL;
1480 if (sp->sa_protocol != PX_PROTO_OL2TP)
1481 goto end;
1482
1483 /* Check for already bound sockets */
1484 error = -EBUSY;
1485 if (sk->sk_state & PPPOX_CONNECTED)
1486 goto end;
1487
1488 /* We don't supporting rebinding anyway */
1489 error = -EALREADY;
1490 if (sk->sk_user_data)
1491 goto end; /* socket is already attached */
1492
1493 /* Don't bind if s_tunnel is 0 */
1494 error = -EINVAL;
1495 if (sp->pppol2tp.s_tunnel == 0)
1496 goto end;
1497
1498 /* Special case: prepare tunnel socket if s_session and
1499 * d_session is 0. Otherwise look up tunnel using supplied
1500 * tunnel id.
1501 */
1502 if ((sp->pppol2tp.s_session == 0) && (sp->pppol2tp.d_session == 0)) {
1503 tunnel_sock = pppol2tp_prepare_tunnel_socket(sp->pppol2tp.fd,
1504 sp->pppol2tp.s_tunnel,
1505 &error);
1506 if (tunnel_sock == NULL)
1507 goto end;
1508
1509 tunnel = tunnel_sock->sk_user_data;
1510 } else {
1511 tunnel = pppol2tp_tunnel_find(sp->pppol2tp.s_tunnel);
1512
1513 /* Error if we can't find the tunnel */
1514 error = -ENOENT;
1515 if (tunnel == NULL)
1516 goto end;
1517
1518 tunnel_sock = tunnel->sock;
1519 }
1520
1521 /* Check that this session doesn't already exist */
1522 error = -EEXIST;
1523 session = pppol2tp_session_find(tunnel, sp->pppol2tp.s_session);
1524 if (session != NULL)
1525 goto end;
1526
1527 /* Allocate and initialize a new session context. */
1528 session = kzalloc(sizeof(struct pppol2tp_session), GFP_KERNEL);
1529 if (session == NULL) {
1530 error = -ENOMEM;
1531 goto end;
1532 }
1533
1534 skb_queue_head_init(&session->reorder_q);
1535
1536 session->magic = L2TP_SESSION_MAGIC;
1537 session->owner = current->pid;
1538 session->sock = sk;
1539 session->tunnel = tunnel;
1540 session->tunnel_sock = tunnel_sock;
1541 session->tunnel_addr = sp->pppol2tp;
1542 sprintf(&session->name[0], "sess %hu/%hu",
1543 session->tunnel_addr.s_tunnel,
1544 session->tunnel_addr.s_session);
1545
1546 session->stats.tunnel_id = session->tunnel_addr.s_tunnel;
1547 session->stats.session_id = session->tunnel_addr.s_session;
1548
1549 INIT_HLIST_NODE(&session->hlist);
1550
1551 /* Inherit debug options from tunnel */
1552 session->debug = tunnel->debug;
1553
1554 /* Default MTU must allow space for UDP/L2TP/PPP
1555 * headers.
1556 */
1557 session->mtu = session->mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
1558
1559 /* If PMTU discovery was enabled, use the MTU that was discovered */
1560 dst = sk_dst_get(sk);
1561 if (dst != NULL) {
1562 u32 pmtu = dst_mtu(__sk_dst_get(sk));
1563 if (pmtu != 0)
1564 session->mtu = session->mru = pmtu -
1565 PPPOL2TP_HEADER_OVERHEAD;
1566 dst_release(dst);
1567 }
1568
1569 /* Special case: if source & dest session_id == 0x0000, this socket is
1570 * being created to manage the tunnel. Don't add the session to the
1571 * session hash list, just set up the internal context for use by
1572 * ioctl() and sockopt() handlers.
1573 */
1574 if ((session->tunnel_addr.s_session == 0) &&
1575 (session->tunnel_addr.d_session == 0)) {
1576 error = 0;
1577 sk->sk_user_data = session;
1578 goto out_no_ppp;
1579 }
1580
1581 /* Get tunnel context from the tunnel socket */
1582 tunnel = pppol2tp_sock_to_tunnel(tunnel_sock);
1583 if (tunnel == NULL) {
1584 error = -EBADF;
1585 goto end;
1586 }
1587
1588 /* Right now, because we don't have a way to push the incoming skb's
1589 * straight through the UDP layer, the only header we need to worry
1590 * about is the L2TP header. This size is different depending on
1591 * whether sequence numbers are enabled for the data channel.
1592 */
1593 po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1594
1595 po->chan.private = sk;
1596 po->chan.ops = &pppol2tp_chan_ops;
1597 po->chan.mtu = session->mtu;
1598
1599 error = ppp_register_channel(&po->chan);
1600 if (error)
1601 goto end;
1602
1603 /* This is how we get the session context from the socket. */
1604 sk->sk_user_data = session;
1605
1606 /* Add session to the tunnel's hash list */
James Chapmancf3752e2008-03-05 18:39:08 -08001607 write_lock_bh(&tunnel->hlist_lock);
James Chapman3557baa2007-06-27 15:49:24 -07001608 hlist_add_head(&session->hlist,
1609 pppol2tp_session_id_hash(tunnel,
1610 session->tunnel_addr.s_session));
James Chapmancf3752e2008-03-05 18:39:08 -08001611 write_unlock_bh(&tunnel->hlist_lock);
James Chapman3557baa2007-06-27 15:49:24 -07001612
1613 atomic_inc(&pppol2tp_session_count);
1614
1615out_no_ppp:
1616 pppol2tp_tunnel_inc_refcount(tunnel);
1617 sk->sk_state = PPPOX_CONNECTED;
1618 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1619 "%s: created\n", session->name);
1620
1621end:
1622 release_sock(sk);
1623
1624 if (error != 0)
1625 PRINTK(session ? session->debug : -1, PPPOL2TP_MSG_CONTROL, KERN_WARNING,
1626 "%s: connect failed: %d\n", session->name, error);
1627
1628 return error;
1629}
1630
1631/* getname() support.
1632 */
1633static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
1634 int *usockaddr_len, int peer)
1635{
1636 int len = sizeof(struct sockaddr_pppol2tp);
1637 struct sockaddr_pppol2tp sp;
1638 int error = 0;
1639 struct pppol2tp_session *session;
1640
1641 error = -ENOTCONN;
1642 if (sock->sk->sk_state != PPPOX_CONNECTED)
1643 goto end;
1644
1645 session = pppol2tp_sock_to_session(sock->sk);
1646 if (session == NULL) {
1647 error = -EBADF;
1648 goto end;
1649 }
1650
1651 sp.sa_family = AF_PPPOX;
1652 sp.sa_protocol = PX_PROTO_OL2TP;
1653 memcpy(&sp.pppol2tp, &session->tunnel_addr,
1654 sizeof(struct pppol2tp_addr));
1655
1656 memcpy(uaddr, &sp, len);
1657
1658 *usockaddr_len = len;
1659
1660 error = 0;
1661
1662end:
1663 return error;
1664}
1665
1666/****************************************************************************
1667 * ioctl() handlers.
1668 *
1669 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1670 * sockets. However, in order to control kernel tunnel features, we allow
1671 * userspace to create a special "tunnel" PPPoX socket which is used for
1672 * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow
1673 * the user application to issue L2TP setsockopt(), getsockopt() and ioctl()
1674 * calls.
1675 ****************************************************************************/
1676
1677/* Session ioctl helper.
1678 */
1679static int pppol2tp_session_ioctl(struct pppol2tp_session *session,
1680 unsigned int cmd, unsigned long arg)
1681{
1682 struct ifreq ifr;
1683 int err = 0;
1684 struct sock *sk = session->sock;
1685 int val = (int) arg;
1686
1687 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1688 "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n",
1689 session->name, cmd, arg);
1690
1691 sock_hold(sk);
1692
1693 switch (cmd) {
1694 case SIOCGIFMTU:
1695 err = -ENXIO;
1696 if (!(sk->sk_state & PPPOX_CONNECTED))
1697 break;
1698
1699 err = -EFAULT;
1700 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1701 break;
1702 ifr.ifr_mtu = session->mtu;
1703 if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq)))
1704 break;
1705
1706 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1707 "%s: get mtu=%d\n", session->name, session->mtu);
1708 err = 0;
1709 break;
1710
1711 case SIOCSIFMTU:
1712 err = -ENXIO;
1713 if (!(sk->sk_state & PPPOX_CONNECTED))
1714 break;
1715
1716 err = -EFAULT;
1717 if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq)))
1718 break;
1719
1720 session->mtu = ifr.ifr_mtu;
1721
1722 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1723 "%s: set mtu=%d\n", session->name, session->mtu);
1724 err = 0;
1725 break;
1726
1727 case PPPIOCGMRU:
1728 err = -ENXIO;
1729 if (!(sk->sk_state & PPPOX_CONNECTED))
1730 break;
1731
1732 err = -EFAULT;
1733 if (put_user(session->mru, (int __user *) arg))
1734 break;
1735
1736 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1737 "%s: get mru=%d\n", session->name, session->mru);
1738 err = 0;
1739 break;
1740
1741 case PPPIOCSMRU:
1742 err = -ENXIO;
1743 if (!(sk->sk_state & PPPOX_CONNECTED))
1744 break;
1745
1746 err = -EFAULT;
1747 if (get_user(val,(int __user *) arg))
1748 break;
1749
1750 session->mru = val;
1751 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1752 "%s: set mru=%d\n", session->name, session->mru);
1753 err = 0;
1754 break;
1755
1756 case PPPIOCGFLAGS:
1757 err = -EFAULT;
1758 if (put_user(session->flags, (int __user *) arg))
1759 break;
1760
1761 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1762 "%s: get flags=%d\n", session->name, session->flags);
1763 err = 0;
1764 break;
1765
1766 case PPPIOCSFLAGS:
1767 err = -EFAULT;
1768 if (get_user(val, (int __user *) arg))
1769 break;
1770 session->flags = val;
1771 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1772 "%s: set flags=%d\n", session->name, session->flags);
1773 err = 0;
1774 break;
1775
1776 case PPPIOCGL2TPSTATS:
1777 err = -ENXIO;
1778 if (!(sk->sk_state & PPPOX_CONNECTED))
1779 break;
1780
1781 if (copy_to_user((void __user *) arg, &session->stats,
1782 sizeof(session->stats)))
1783 break;
1784 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1785 "%s: get L2TP stats\n", session->name);
1786 err = 0;
1787 break;
1788
1789 default:
1790 err = -ENOSYS;
1791 break;
1792 }
1793
1794 sock_put(sk);
1795
1796 return err;
1797}
1798
1799/* Tunnel ioctl helper.
1800 *
1801 * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data
1802 * specifies a session_id, the session ioctl handler is called. This allows an
1803 * application to retrieve session stats via a tunnel socket.
1804 */
1805static int pppol2tp_tunnel_ioctl(struct pppol2tp_tunnel *tunnel,
1806 unsigned int cmd, unsigned long arg)
1807{
1808 int err = 0;
1809 struct sock *sk = tunnel->sock;
1810 struct pppol2tp_ioc_stats stats_req;
1811
1812 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG,
1813 "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n", tunnel->name,
1814 cmd, arg);
1815
1816 sock_hold(sk);
1817
1818 switch (cmd) {
1819 case PPPIOCGL2TPSTATS:
1820 err = -ENXIO;
1821 if (!(sk->sk_state & PPPOX_CONNECTED))
1822 break;
1823
1824 if (copy_from_user(&stats_req, (void __user *) arg,
1825 sizeof(stats_req))) {
1826 err = -EFAULT;
1827 break;
1828 }
1829 if (stats_req.session_id != 0) {
1830 /* resend to session ioctl handler */
1831 struct pppol2tp_session *session =
1832 pppol2tp_session_find(tunnel, stats_req.session_id);
1833 if (session != NULL)
1834 err = pppol2tp_session_ioctl(session, cmd, arg);
1835 else
1836 err = -EBADR;
1837 break;
1838 }
1839#ifdef CONFIG_XFRM
1840 tunnel->stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0;
1841#endif
1842 if (copy_to_user((void __user *) arg, &tunnel->stats,
1843 sizeof(tunnel->stats))) {
1844 err = -EFAULT;
1845 break;
1846 }
1847 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1848 "%s: get L2TP stats\n", tunnel->name);
1849 err = 0;
1850 break;
1851
1852 default:
1853 err = -ENOSYS;
1854 break;
1855 }
1856
1857 sock_put(sk);
1858
1859 return err;
1860}
1861
1862/* Main ioctl() handler.
1863 * Dispatch to tunnel or session helpers depending on the socket.
1864 */
1865static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
1866 unsigned long arg)
1867{
1868 struct sock *sk = sock->sk;
1869 struct pppol2tp_session *session;
1870 struct pppol2tp_tunnel *tunnel;
1871 int err;
1872
1873 if (!sk)
1874 return 0;
1875
1876 err = -EBADF;
1877 if (sock_flag(sk, SOCK_DEAD) != 0)
1878 goto end;
1879
1880 err = -ENOTCONN;
1881 if ((sk->sk_user_data == NULL) ||
1882 (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND))))
1883 goto end;
1884
1885 /* Get session context from the socket */
1886 err = -EBADF;
1887 session = pppol2tp_sock_to_session(sk);
1888 if (session == NULL)
1889 goto end;
1890
1891 /* Special case: if session's session_id is zero, treat ioctl as a
1892 * tunnel ioctl
1893 */
1894 if ((session->tunnel_addr.s_session == 0) &&
1895 (session->tunnel_addr.d_session == 0)) {
1896 err = -EBADF;
1897 tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock);
1898 if (tunnel == NULL)
1899 goto end;
1900
1901 err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg);
1902 goto end;
1903 }
1904
1905 err = pppol2tp_session_ioctl(session, cmd, arg);
1906
1907end:
1908 return err;
1909}
1910
1911/*****************************************************************************
1912 * setsockopt() / getsockopt() support.
1913 *
1914 * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP
1915 * sockets. In order to control kernel tunnel features, we allow userspace to
1916 * create a special "tunnel" PPPoX socket which is used for control only.
1917 * Tunnel PPPoX sockets have session_id == 0 and simply allow the user
1918 * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls.
1919 *****************************************************************************/
1920
1921/* Tunnel setsockopt() helper.
1922 */
1923static int pppol2tp_tunnel_setsockopt(struct sock *sk,
1924 struct pppol2tp_tunnel *tunnel,
1925 int optname, int val)
1926{
1927 int err = 0;
1928
1929 switch (optname) {
1930 case PPPOL2TP_SO_DEBUG:
1931 tunnel->debug = val;
1932 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1933 "%s: set debug=%x\n", tunnel->name, tunnel->debug);
1934 break;
1935
1936 default:
1937 err = -ENOPROTOOPT;
1938 break;
1939 }
1940
1941 return err;
1942}
1943
1944/* Session setsockopt helper.
1945 */
1946static int pppol2tp_session_setsockopt(struct sock *sk,
1947 struct pppol2tp_session *session,
1948 int optname, int val)
1949{
1950 int err = 0;
1951
1952 switch (optname) {
1953 case PPPOL2TP_SO_RECVSEQ:
1954 if ((val != 0) && (val != 1)) {
1955 err = -EINVAL;
1956 break;
1957 }
1958 session->recv_seq = val ? -1 : 0;
1959 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1960 "%s: set recv_seq=%d\n", session->name,
1961 session->recv_seq);
1962 break;
1963
1964 case PPPOL2TP_SO_SENDSEQ:
1965 if ((val != 0) && (val != 1)) {
1966 err = -EINVAL;
1967 break;
1968 }
1969 session->send_seq = val ? -1 : 0;
1970 {
1971 struct sock *ssk = session->sock;
1972 struct pppox_sock *po = pppox_sk(ssk);
1973 po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ :
1974 PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
1975 }
1976 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1977 "%s: set send_seq=%d\n", session->name, session->send_seq);
1978 break;
1979
1980 case PPPOL2TP_SO_LNSMODE:
1981 if ((val != 0) && (val != 1)) {
1982 err = -EINVAL;
1983 break;
1984 }
1985 session->lns_mode = val ? -1 : 0;
1986 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1987 "%s: set lns_mode=%d\n", session->name,
1988 session->lns_mode);
1989 break;
1990
1991 case PPPOL2TP_SO_DEBUG:
1992 session->debug = val;
1993 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
1994 "%s: set debug=%x\n", session->name, session->debug);
1995 break;
1996
1997 case PPPOL2TP_SO_REORDERTO:
1998 session->reorder_timeout = msecs_to_jiffies(val);
1999 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
2000 "%s: set reorder_timeout=%d\n", session->name,
2001 session->reorder_timeout);
2002 break;
2003
2004 default:
2005 err = -ENOPROTOOPT;
2006 break;
2007 }
2008
2009 return err;
2010}
2011
2012/* Main setsockopt() entry point.
2013 * Does API checks, then calls either the tunnel or session setsockopt
2014 * handler, according to whether the PPPoL2TP socket is a for a regular
2015 * session or the special tunnel type.
2016 */
2017static int pppol2tp_setsockopt(struct socket *sock, int level, int optname,
2018 char __user *optval, int optlen)
2019{
2020 struct sock *sk = sock->sk;
2021 struct pppol2tp_session *session = sk->sk_user_data;
2022 struct pppol2tp_tunnel *tunnel;
2023 int val;
2024 int err;
2025
2026 if (level != SOL_PPPOL2TP)
2027 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
2028
2029 if (optlen < sizeof(int))
2030 return -EINVAL;
2031
2032 if (get_user(val, (int __user *)optval))
2033 return -EFAULT;
2034
2035 err = -ENOTCONN;
2036 if (sk->sk_user_data == NULL)
2037 goto end;
2038
2039 /* Get session context from the socket */
2040 err = -EBADF;
2041 session = pppol2tp_sock_to_session(sk);
2042 if (session == NULL)
2043 goto end;
2044
2045 /* Special case: if session_id == 0x0000, treat as operation on tunnel
2046 */
2047 if ((session->tunnel_addr.s_session == 0) &&
2048 (session->tunnel_addr.d_session == 0)) {
2049 err = -EBADF;
2050 tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock);
2051 if (tunnel == NULL)
2052 goto end;
2053
2054 err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val);
2055 } else
2056 err = pppol2tp_session_setsockopt(sk, session, optname, val);
2057
2058 err = 0;
2059
2060end:
2061 return err;
2062}
2063
2064/* Tunnel getsockopt helper. Called with sock locked.
2065 */
2066static int pppol2tp_tunnel_getsockopt(struct sock *sk,
2067 struct pppol2tp_tunnel *tunnel,
Al Viroaf3b1622007-07-26 17:35:09 +01002068 int optname, int *val)
James Chapman3557baa2007-06-27 15:49:24 -07002069{
2070 int err = 0;
2071
2072 switch (optname) {
2073 case PPPOL2TP_SO_DEBUG:
2074 *val = tunnel->debug;
2075 PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
2076 "%s: get debug=%x\n", tunnel->name, tunnel->debug);
2077 break;
2078
2079 default:
2080 err = -ENOPROTOOPT;
2081 break;
2082 }
2083
2084 return err;
2085}
2086
2087/* Session getsockopt helper. Called with sock locked.
2088 */
2089static int pppol2tp_session_getsockopt(struct sock *sk,
2090 struct pppol2tp_session *session,
Al Viroaf3b1622007-07-26 17:35:09 +01002091 int optname, int *val)
James Chapman3557baa2007-06-27 15:49:24 -07002092{
2093 int err = 0;
2094
2095 switch (optname) {
2096 case PPPOL2TP_SO_RECVSEQ:
2097 *val = session->recv_seq;
2098 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
2099 "%s: get recv_seq=%d\n", session->name, *val);
2100 break;
2101
2102 case PPPOL2TP_SO_SENDSEQ:
2103 *val = session->send_seq;
2104 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
2105 "%s: get send_seq=%d\n", session->name, *val);
2106 break;
2107
2108 case PPPOL2TP_SO_LNSMODE:
2109 *val = session->lns_mode;
2110 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
2111 "%s: get lns_mode=%d\n", session->name, *val);
2112 break;
2113
2114 case PPPOL2TP_SO_DEBUG:
2115 *val = session->debug;
2116 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
2117 "%s: get debug=%d\n", session->name, *val);
2118 break;
2119
2120 case PPPOL2TP_SO_REORDERTO:
2121 *val = (int) jiffies_to_msecs(session->reorder_timeout);
2122 PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO,
2123 "%s: get reorder_timeout=%d\n", session->name, *val);
2124 break;
2125
2126 default:
2127 err = -ENOPROTOOPT;
2128 }
2129
2130 return err;
2131}
2132
2133/* Main getsockopt() entry point.
2134 * Does API checks, then calls either the tunnel or session getsockopt
2135 * handler, according to whether the PPPoX socket is a for a regular session
2136 * or the special tunnel type.
2137 */
2138static int pppol2tp_getsockopt(struct socket *sock, int level,
2139 int optname, char __user *optval, int __user *optlen)
2140{
2141 struct sock *sk = sock->sk;
2142 struct pppol2tp_session *session = sk->sk_user_data;
2143 struct pppol2tp_tunnel *tunnel;
2144 int val, len;
2145 int err;
2146
2147 if (level != SOL_PPPOL2TP)
2148 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
2149
2150 if (get_user(len, (int __user *) optlen))
2151 return -EFAULT;
2152
2153 len = min_t(unsigned int, len, sizeof(int));
2154
2155 if (len < 0)
2156 return -EINVAL;
2157
2158 err = -ENOTCONN;
2159 if (sk->sk_user_data == NULL)
2160 goto end;
2161
2162 /* Get the session context */
2163 err = -EBADF;
2164 session = pppol2tp_sock_to_session(sk);
2165 if (session == NULL)
2166 goto end;
2167
2168 /* Special case: if session_id == 0x0000, treat as operation on tunnel */
2169 if ((session->tunnel_addr.s_session == 0) &&
2170 (session->tunnel_addr.d_session == 0)) {
2171 err = -EBADF;
2172 tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock);
2173 if (tunnel == NULL)
2174 goto end;
2175
2176 err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val);
2177 } else
2178 err = pppol2tp_session_getsockopt(sk, session, optname, &val);
2179
2180 err = -EFAULT;
2181 if (put_user(len, (int __user *) optlen))
2182 goto end;
2183
2184 if (copy_to_user((void __user *) optval, &val, len))
2185 goto end;
2186
2187 err = 0;
2188end:
2189 return err;
2190}
2191
2192/*****************************************************************************
2193 * /proc filesystem for debug
2194 *****************************************************************************/
2195
2196#ifdef CONFIG_PROC_FS
2197
2198#include <linux/seq_file.h>
2199
2200struct pppol2tp_seq_data {
2201 struct pppol2tp_tunnel *tunnel; /* current tunnel */
2202 struct pppol2tp_session *session; /* NULL means get first session in tunnel */
2203};
2204
2205static struct pppol2tp_session *next_session(struct pppol2tp_tunnel *tunnel, struct pppol2tp_session *curr)
2206{
2207 struct pppol2tp_session *session = NULL;
2208 struct hlist_node *walk;
2209 int found = 0;
2210 int next = 0;
2211 int i;
2212
James Chapmancf3752e2008-03-05 18:39:08 -08002213 read_lock_bh(&tunnel->hlist_lock);
James Chapman3557baa2007-06-27 15:49:24 -07002214 for (i = 0; i < PPPOL2TP_HASH_SIZE; i++) {
2215 hlist_for_each_entry(session, walk, &tunnel->session_hlist[i], hlist) {
2216 if (curr == NULL) {
2217 found = 1;
2218 goto out;
2219 }
2220 if (session == curr) {
2221 next = 1;
2222 continue;
2223 }
2224 if (next) {
2225 found = 1;
2226 goto out;
2227 }
2228 }
2229 }
2230out:
James Chapmancf3752e2008-03-05 18:39:08 -08002231 read_unlock_bh(&tunnel->hlist_lock);
James Chapman3557baa2007-06-27 15:49:24 -07002232 if (!found)
2233 session = NULL;
2234
2235 return session;
2236}
2237
2238static struct pppol2tp_tunnel *next_tunnel(struct pppol2tp_tunnel *curr)
2239{
2240 struct pppol2tp_tunnel *tunnel = NULL;
2241
James Chapmancf3752e2008-03-05 18:39:08 -08002242 read_lock_bh(&pppol2tp_tunnel_list_lock);
James Chapman3557baa2007-06-27 15:49:24 -07002243 if (list_is_last(&curr->list, &pppol2tp_tunnel_list)) {
2244 goto out;
2245 }
2246 tunnel = list_entry(curr->list.next, struct pppol2tp_tunnel, list);
2247out:
James Chapmancf3752e2008-03-05 18:39:08 -08002248 read_unlock_bh(&pppol2tp_tunnel_list_lock);
James Chapman3557baa2007-06-27 15:49:24 -07002249
2250 return tunnel;
2251}
2252
2253static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
2254{
2255 struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
2256 loff_t pos = *offs;
2257
2258 if (!pos)
2259 goto out;
2260
2261 BUG_ON(m->private == NULL);
2262 pd = m->private;
2263
2264 if (pd->tunnel == NULL) {
2265 if (!list_empty(&pppol2tp_tunnel_list))
2266 pd->tunnel = list_entry(pppol2tp_tunnel_list.next, struct pppol2tp_tunnel, list);
2267 } else {
2268 pd->session = next_session(pd->tunnel, pd->session);
2269 if (pd->session == NULL) {
2270 pd->tunnel = next_tunnel(pd->tunnel);
2271 }
2272 }
2273
2274 /* NULL tunnel and session indicates end of list */
2275 if ((pd->tunnel == NULL) && (pd->session == NULL))
2276 pd = NULL;
2277
2278out:
2279 return pd;
2280}
2281
2282static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos)
2283{
2284 (*pos)++;
2285 return NULL;
2286}
2287
2288static void pppol2tp_seq_stop(struct seq_file *p, void *v)
2289{
2290 /* nothing to do */
2291}
2292
2293static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v)
2294{
2295 struct pppol2tp_tunnel *tunnel = v;
2296
2297 seq_printf(m, "\nTUNNEL '%s', %c %d\n",
2298 tunnel->name,
2299 (tunnel == tunnel->sock->sk_user_data) ? 'Y':'N',
2300 atomic_read(&tunnel->ref_count) - 1);
2301 seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n",
2302 tunnel->debug,
Andrew Morton0efeaa32008-02-09 23:17:51 -08002303 (unsigned long long)tunnel->stats.tx_packets,
2304 (unsigned long long)tunnel->stats.tx_bytes,
2305 (unsigned long long)tunnel->stats.tx_errors,
2306 (unsigned long long)tunnel->stats.rx_packets,
2307 (unsigned long long)tunnel->stats.rx_bytes,
2308 (unsigned long long)tunnel->stats.rx_errors);
James Chapman3557baa2007-06-27 15:49:24 -07002309}
2310
2311static void pppol2tp_seq_session_show(struct seq_file *m, void *v)
2312{
2313 struct pppol2tp_session *session = v;
2314
2315 seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> "
2316 "%04X/%04X %d %c\n",
2317 session->name,
2318 ntohl(session->tunnel_addr.addr.sin_addr.s_addr),
2319 ntohs(session->tunnel_addr.addr.sin_port),
2320 session->tunnel_addr.s_tunnel,
2321 session->tunnel_addr.s_session,
2322 session->tunnel_addr.d_tunnel,
2323 session->tunnel_addr.d_session,
2324 session->sock->sk_state,
2325 (session == session->sock->sk_user_data) ?
2326 'Y' : 'N');
2327 seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n",
2328 session->mtu, session->mru,
2329 session->recv_seq ? 'R' : '-',
2330 session->send_seq ? 'S' : '-',
2331 session->lns_mode ? "LNS" : "LAC",
2332 session->debug,
2333 jiffies_to_msecs(session->reorder_timeout));
2334 seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n",
2335 session->nr, session->ns,
Andrew Morton0efeaa32008-02-09 23:17:51 -08002336 (unsigned long long)session->stats.tx_packets,
2337 (unsigned long long)session->stats.tx_bytes,
2338 (unsigned long long)session->stats.tx_errors,
2339 (unsigned long long)session->stats.rx_packets,
2340 (unsigned long long)session->stats.rx_bytes,
2341 (unsigned long long)session->stats.rx_errors);
James Chapman3557baa2007-06-27 15:49:24 -07002342}
2343
2344static int pppol2tp_seq_show(struct seq_file *m, void *v)
2345{
2346 struct pppol2tp_seq_data *pd = v;
2347
2348 /* display header on line 1 */
2349 if (v == SEQ_START_TOKEN) {
2350 seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n");
2351 seq_puts(m, "TUNNEL name, user-data-ok session-count\n");
2352 seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
2353 seq_puts(m, " SESSION name, addr/port src-tid/sid "
2354 "dest-tid/sid state user-data-ok\n");
2355 seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n");
2356 seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
2357 goto out;
2358 }
2359
2360 /* Show the tunnel or session context.
2361 */
2362 if (pd->session == NULL)
2363 pppol2tp_seq_tunnel_show(m, pd->tunnel);
2364 else
2365 pppol2tp_seq_session_show(m, pd->session);
2366
2367out:
2368 return 0;
2369}
2370
2371static struct seq_operations pppol2tp_seq_ops = {
2372 .start = pppol2tp_seq_start,
2373 .next = pppol2tp_seq_next,
2374 .stop = pppol2tp_seq_stop,
2375 .show = pppol2tp_seq_show,
2376};
2377
2378/* Called when our /proc file is opened. We allocate data for use when
2379 * iterating our tunnel / session contexts and store it in the private
2380 * data of the seq_file.
2381 */
2382static int pppol2tp_proc_open(struct inode *inode, struct file *file)
2383{
2384 struct seq_file *m;
2385 struct pppol2tp_seq_data *pd;
2386 int ret = 0;
2387
2388 ret = seq_open(file, &pppol2tp_seq_ops);
2389 if (ret < 0)
2390 goto out;
2391
2392 m = file->private_data;
2393
2394 /* Allocate and fill our proc_data for access later */
2395 ret = -ENOMEM;
2396 m->private = kzalloc(sizeof(struct pppol2tp_seq_data), GFP_KERNEL);
2397 if (m->private == NULL)
2398 goto out;
2399
2400 pd = m->private;
2401 ret = 0;
2402
2403out:
2404 return ret;
2405}
2406
2407/* Called when /proc file access completes.
2408 */
2409static int pppol2tp_proc_release(struct inode *inode, struct file *file)
2410{
2411 struct seq_file *m = (struct seq_file *)file->private_data;
2412
2413 kfree(m->private);
2414 m->private = NULL;
2415
2416 return seq_release(inode, file);
2417}
2418
2419static struct file_operations pppol2tp_proc_fops = {
2420 .owner = THIS_MODULE,
2421 .open = pppol2tp_proc_open,
2422 .read = seq_read,
2423 .llseek = seq_lseek,
2424 .release = pppol2tp_proc_release,
2425};
2426
2427static struct proc_dir_entry *pppol2tp_proc;
2428
2429#endif /* CONFIG_PROC_FS */
2430
2431/*****************************************************************************
2432 * Init and cleanup
2433 *****************************************************************************/
2434
2435static struct proto_ops pppol2tp_ops = {
2436 .family = AF_PPPOX,
2437 .owner = THIS_MODULE,
2438 .release = pppol2tp_release,
2439 .bind = sock_no_bind,
2440 .connect = pppol2tp_connect,
2441 .socketpair = sock_no_socketpair,
2442 .accept = sock_no_accept,
2443 .getname = pppol2tp_getname,
2444 .poll = datagram_poll,
2445 .listen = sock_no_listen,
2446 .shutdown = sock_no_shutdown,
2447 .setsockopt = pppol2tp_setsockopt,
2448 .getsockopt = pppol2tp_getsockopt,
2449 .sendmsg = pppol2tp_sendmsg,
2450 .recvmsg = pppol2tp_recvmsg,
2451 .mmap = sock_no_mmap,
2452 .ioctl = pppox_ioctl,
2453};
2454
2455static struct pppox_proto pppol2tp_proto = {
2456 .create = pppol2tp_create,
2457 .ioctl = pppol2tp_ioctl
2458};
2459
2460static int __init pppol2tp_init(void)
2461{
2462 int err;
2463
2464 err = proto_register(&pppol2tp_sk_proto, 0);
2465 if (err)
2466 goto out;
2467 err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto);
2468 if (err)
2469 goto out_unregister_pppol2tp_proto;
2470
2471#ifdef CONFIG_PROC_FS
Denis V. Luneva95609c2008-04-29 01:02:29 -07002472 pppol2tp_proc = proc_net_fops_create(&init_net, "pppol2tp", 0,
2473 &pppol2tp_proc_fops);
James Chapman3557baa2007-06-27 15:49:24 -07002474 if (!pppol2tp_proc) {
2475 err = -ENOMEM;
2476 goto out_unregister_pppox_proto;
2477 }
James Chapman3557baa2007-06-27 15:49:24 -07002478#endif /* CONFIG_PROC_FS */
2479 printk(KERN_INFO "PPPoL2TP kernel driver, %s\n",
2480 PPPOL2TP_DRV_VERSION);
2481
2482out:
2483 return err;
Rami Rosen731a0602008-02-05 16:30:50 -08002484#ifdef CONFIG_PROC_FS
James Chapman3557baa2007-06-27 15:49:24 -07002485out_unregister_pppox_proto:
2486 unregister_pppox_proto(PX_PROTO_OL2TP);
Rami Rosen731a0602008-02-05 16:30:50 -08002487#endif
James Chapman3557baa2007-06-27 15:49:24 -07002488out_unregister_pppol2tp_proto:
2489 proto_unregister(&pppol2tp_sk_proto);
2490 goto out;
2491}
2492
2493static void __exit pppol2tp_exit(void)
2494{
2495 unregister_pppox_proto(PX_PROTO_OL2TP);
2496
2497#ifdef CONFIG_PROC_FS
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02002498 remove_proc_entry("pppol2tp", init_net.proc_net);
James Chapman3557baa2007-06-27 15:49:24 -07002499#endif
2500 proto_unregister(&pppol2tp_sk_proto);
2501}
2502
2503module_init(pppol2tp_init);
2504module_exit(pppol2tp_exit);
2505
Joe Perches24500222007-11-19 17:48:28 -08002506MODULE_AUTHOR("Martijn van Oosterhout <kleptog@svana.org>, "
James Chapman3557baa2007-06-27 15:49:24 -07002507 "James Chapman <jchapman@katalix.com>");
2508MODULE_DESCRIPTION("PPP over L2TP over UDP");
2509MODULE_LICENSE("GPL");
2510MODULE_VERSION(PPPOL2TP_DRV_VERSION);