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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
fd558d18 JC |
2 | /***************************************************************************** |
3 | * Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets | |
4 | * | |
5 | * PPPoX --- Generic PPP encapsulation socket family | |
6 | * PPPoL2TP --- PPP over L2TP (RFC 2661) | |
7 | * | |
8 | * Version: 2.0.0 | |
9 | * | |
10 | * Authors: James Chapman (jchapman@katalix.com) | |
11 | * | |
12 | * Based on original work by Martijn van Oosterhout <kleptog@svana.org> | |
13 | * | |
14 | * License: | |
fd558d18 JC |
15 | */ |
16 | ||
17 | /* This driver handles only L2TP data frames; control frames are handled by a | |
18 | * userspace application. | |
19 | * | |
20 | * To send data in an L2TP session, userspace opens a PPPoL2TP socket and | |
21 | * attaches it to a bound UDP socket with local tunnel_id / session_id and | |
22 | * peer tunnel_id / session_id set. Data can then be sent or received using | |
23 | * regular socket sendmsg() / recvmsg() calls. Kernel parameters of the socket | |
24 | * can be read or modified using ioctl() or [gs]etsockopt() calls. | |
25 | * | |
26 | * When a PPPoL2TP socket is connected with local and peer session_id values | |
27 | * zero, the socket is treated as a special tunnel management socket. | |
28 | * | |
29 | * Here's example userspace code to create a socket for sending/receiving data | |
30 | * over an L2TP session:- | |
31 | * | |
32 | * struct sockaddr_pppol2tp sax; | |
33 | * int fd; | |
34 | * int session_fd; | |
35 | * | |
36 | * fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP); | |
37 | * | |
38 | * sax.sa_family = AF_PPPOX; | |
39 | * sax.sa_protocol = PX_PROTO_OL2TP; | |
40 | * sax.pppol2tp.fd = tunnel_fd; // bound UDP socket | |
41 | * sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr; | |
42 | * sax.pppol2tp.addr.sin_port = addr->sin_port; | |
43 | * sax.pppol2tp.addr.sin_family = AF_INET; | |
44 | * sax.pppol2tp.s_tunnel = tunnel_id; | |
45 | * sax.pppol2tp.s_session = session_id; | |
46 | * sax.pppol2tp.d_tunnel = peer_tunnel_id; | |
47 | * sax.pppol2tp.d_session = peer_session_id; | |
48 | * | |
49 | * session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax)); | |
50 | * | |
51 | * A pppd plugin that allows PPP traffic to be carried over L2TP using | |
52 | * this driver is available from the OpenL2TP project at | |
53 | * http://openl2tp.sourceforge.net. | |
54 | */ | |
55 | ||
a4ca44fa JP |
56 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
57 | ||
fd558d18 JC |
58 | #include <linux/module.h> |
59 | #include <linux/string.h> | |
60 | #include <linux/list.h> | |
61 | #include <linux/uaccess.h> | |
62 | ||
63 | #include <linux/kernel.h> | |
64 | #include <linux/spinlock.h> | |
65 | #include <linux/kthread.h> | |
66 | #include <linux/sched.h> | |
67 | #include <linux/slab.h> | |
68 | #include <linux/errno.h> | |
69 | #include <linux/jiffies.h> | |
70 | ||
71 | #include <linux/netdevice.h> | |
72 | #include <linux/net.h> | |
73 | #include <linux/inetdevice.h> | |
74 | #include <linux/skbuff.h> | |
75 | #include <linux/init.h> | |
76 | #include <linux/ip.h> | |
77 | #include <linux/udp.h> | |
78 | #include <linux/if_pppox.h> | |
79 | #include <linux/if_pppol2tp.h> | |
80 | #include <net/sock.h> | |
81 | #include <linux/ppp_channel.h> | |
82 | #include <linux/ppp_defs.h> | |
4b32da2b | 83 | #include <linux/ppp-ioctl.h> |
fd558d18 JC |
84 | #include <linux/file.h> |
85 | #include <linux/hash.h> | |
86 | #include <linux/sort.h> | |
87 | #include <linux/proc_fs.h> | |
309795f4 | 88 | #include <linux/l2tp.h> |
fd558d18 JC |
89 | #include <linux/nsproxy.h> |
90 | #include <net/net_namespace.h> | |
91 | #include <net/netns/generic.h> | |
fd558d18 JC |
92 | #include <net/ip.h> |
93 | #include <net/udp.h> | |
cf2f5c88 | 94 | #include <net/inet_common.h> |
fd558d18 JC |
95 | |
96 | #include <asm/byteorder.h> | |
60063497 | 97 | #include <linux/atomic.h> |
fd558d18 JC |
98 | |
99 | #include "l2tp_core.h" | |
100 | ||
101 | #define PPPOL2TP_DRV_VERSION "V2.0" | |
102 | ||
103 | /* Space for UDP, L2TP and PPP headers */ | |
104 | #define PPPOL2TP_HEADER_OVERHEAD 40 | |
105 | ||
fd558d18 JC |
106 | /* Number of bytes to build transmit L2TP headers. |
107 | * Unfortunately the size is different depending on whether sequence numbers | |
108 | * are enabled. | |
109 | */ | |
110 | #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10 | |
111 | #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6 | |
112 | ||
113 | /* Private data of each session. This data lives at the end of struct | |
114 | * l2tp_session, referenced via session->priv[]. | |
115 | */ | |
116 | struct pppol2tp_session { | |
117 | int owner; /* pid that opened the socket */ | |
118 | ||
ee40fb2e GN |
119 | struct mutex sk_lock; /* Protects .sk */ |
120 | struct sock __rcu *sk; /* Pointer to the session | |
fd558d18 | 121 | * PPPoX socket */ |
ee40fb2e GN |
122 | struct sock *__sk; /* Copy of .sk, for cleanup */ |
123 | struct rcu_head rcu; /* For asynchronous release */ | |
fd558d18 JC |
124 | }; |
125 | ||
126 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
127 | ||
d7100da0 | 128 | static const struct ppp_channel_ops pppol2tp_chan_ops = { |
129 | .start_xmit = pppol2tp_xmit, | |
130 | }; | |
131 | ||
fd558d18 JC |
132 | static const struct proto_ops pppol2tp_ops; |
133 | ||
ee40fb2e GN |
134 | /* Retrieves the pppol2tp socket associated to a session. |
135 | * A reference is held on the returned socket, so this function must be paired | |
136 | * with sock_put(). | |
137 | */ | |
138 | static struct sock *pppol2tp_session_get_sock(struct l2tp_session *session) | |
139 | { | |
140 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
141 | struct sock *sk; | |
142 | ||
143 | rcu_read_lock(); | |
144 | sk = rcu_dereference(ps->sk); | |
145 | if (sk) | |
146 | sock_hold(sk); | |
147 | rcu_read_unlock(); | |
148 | ||
149 | return sk; | |
150 | } | |
151 | ||
fd558d18 JC |
152 | /* Helpers to obtain tunnel/session contexts from sockets. |
153 | */ | |
154 | static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk) | |
155 | { | |
156 | struct l2tp_session *session; | |
157 | ||
158 | if (sk == NULL) | |
159 | return NULL; | |
160 | ||
161 | sock_hold(sk); | |
162 | session = (struct l2tp_session *)(sk->sk_user_data); | |
163 | if (session == NULL) { | |
164 | sock_put(sk); | |
165 | goto out; | |
166 | } | |
167 | ||
168 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
169 | ||
170 | out: | |
171 | return session; | |
172 | } | |
173 | ||
174 | /***************************************************************************** | |
175 | * Receive data handling | |
176 | *****************************************************************************/ | |
177 | ||
fd558d18 JC |
178 | /* Receive message. This is the recvmsg for the PPPoL2TP socket. |
179 | */ | |
1b784140 YX |
180 | static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg, |
181 | size_t len, int flags) | |
fd558d18 JC |
182 | { |
183 | int err; | |
184 | struct sk_buff *skb; | |
185 | struct sock *sk = sock->sk; | |
186 | ||
187 | err = -EIO; | |
188 | if (sk->sk_state & PPPOX_BOUND) | |
189 | goto end; | |
190 | ||
fd558d18 JC |
191 | err = 0; |
192 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
193 | flags & MSG_DONTWAIT, &err); | |
194 | if (!skb) | |
195 | goto end; | |
196 | ||
197 | if (len > skb->len) | |
198 | len = skb->len; | |
199 | else if (len < skb->len) | |
200 | msg->msg_flags |= MSG_TRUNC; | |
201 | ||
51f3d02b | 202 | err = skb_copy_datagram_msg(skb, 0, msg, len); |
fd558d18 JC |
203 | if (likely(err == 0)) |
204 | err = len; | |
205 | ||
206 | kfree_skb(skb); | |
207 | end: | |
208 | return err; | |
209 | } | |
210 | ||
211 | static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len) | |
212 | { | |
213 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
214 | struct sock *sk = NULL; | |
215 | ||
216 | /* If the socket is bound, send it in to PPP's input queue. Otherwise | |
217 | * queue it on the session socket. | |
218 | */ | |
ee40fb2e GN |
219 | rcu_read_lock(); |
220 | sk = rcu_dereference(ps->sk); | |
fd558d18 JC |
221 | if (sk == NULL) |
222 | goto no_sock; | |
223 | ||
2b139e6b GN |
224 | /* If the first two bytes are 0xFF03, consider that it is the PPP's |
225 | * Address and Control fields and skip them. The L2TP module has always | |
226 | * worked this way, although, in theory, the use of these fields should | |
227 | * be negociated and handled at the PPP layer. These fields are | |
228 | * constant: 0xFF is the All-Stations Address and 0x03 the Unnumbered | |
229 | * Information command with Poll/Final bit set to zero (RFC 1662). | |
230 | */ | |
231 | if (pskb_may_pull(skb, 2) && skb->data[0] == PPP_ALLSTATIONS && | |
232 | skb->data[1] == PPP_UI) | |
233 | skb_pull(skb, 2); | |
234 | ||
fd558d18 JC |
235 | if (sk->sk_state & PPPOX_BOUND) { |
236 | struct pppox_sock *po; | |
98f40b3e | 237 | |
fba40c63 | 238 | l2tp_dbg(session, L2TP_MSG_DATA, |
a4ca44fa JP |
239 | "%s: recv %d byte data frame, passing to ppp\n", |
240 | session->name, data_len); | |
fd558d18 | 241 | |
fd558d18 JC |
242 | po = pppox_sk(sk); |
243 | ppp_input(&po->chan, skb); | |
244 | } else { | |
fba40c63 | 245 | l2tp_dbg(session, L2TP_MSG_DATA, |
9e9cb622 GN |
246 | "%s: recv %d byte data frame, passing to L2TP socket\n", |
247 | session->name, data_len); | |
fd558d18 | 248 | |
9e9cb622 GN |
249 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
250 | atomic_long_inc(&session->stats.rx_errors); | |
251 | kfree_skb(skb); | |
252 | } | |
fd558d18 | 253 | } |
ee40fb2e | 254 | rcu_read_unlock(); |
fd558d18 JC |
255 | |
256 | return; | |
257 | ||
258 | no_sock: | |
ee40fb2e | 259 | rcu_read_unlock(); |
fba40c63 | 260 | l2tp_info(session, L2TP_MSG_DATA, "%s: no socket\n", session->name); |
fd558d18 JC |
261 | kfree_skb(skb); |
262 | } | |
263 | ||
fd558d18 JC |
264 | /************************************************************************ |
265 | * Transmit handling | |
266 | ***********************************************************************/ | |
267 | ||
fd558d18 JC |
268 | /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here |
269 | * when a user application does a sendmsg() on the session socket. L2TP and | |
270 | * PPP headers must be inserted into the user's data. | |
271 | */ | |
1b784140 | 272 | static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m, |
fd558d18 JC |
273 | size_t total_len) |
274 | { | |
fd558d18 JC |
275 | struct sock *sk = sock->sk; |
276 | struct sk_buff *skb; | |
277 | int error; | |
278 | struct l2tp_session *session; | |
279 | struct l2tp_tunnel *tunnel; | |
0d76751f | 280 | int uhlen; |
fd558d18 JC |
281 | |
282 | error = -ENOTCONN; | |
283 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
284 | goto error; | |
285 | ||
286 | /* Get session and tunnel contexts */ | |
287 | error = -EBADF; | |
288 | session = pppol2tp_sock_to_session(sk); | |
289 | if (session == NULL) | |
290 | goto error; | |
291 | ||
7198c77a | 292 | tunnel = session->tunnel; |
fd558d18 | 293 | |
0d76751f JC |
294 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
295 | ||
fd558d18 JC |
296 | /* Allocate a socket buffer */ |
297 | error = -ENOMEM; | |
298 | skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + | |
0d76751f | 299 | uhlen + session->hdr_len + |
54c151d9 | 300 | 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ |
fd558d18 JC |
301 | 0, GFP_KERNEL); |
302 | if (!skb) | |
7198c77a | 303 | goto error_put_sess; |
fd558d18 JC |
304 | |
305 | /* Reserve space for headers. */ | |
306 | skb_reserve(skb, NET_SKB_PAD); | |
307 | skb_reset_network_header(skb); | |
308 | skb_reserve(skb, sizeof(struct iphdr)); | |
309 | skb_reset_transport_header(skb); | |
0d76751f | 310 | skb_reserve(skb, uhlen); |
fd558d18 JC |
311 | |
312 | /* Add PPP header */ | |
54c151d9 GF |
313 | skb->data[0] = PPP_ALLSTATIONS; |
314 | skb->data[1] = PPP_UI; | |
fd558d18 JC |
315 | skb_put(skb, 2); |
316 | ||
317 | /* Copy user data into skb */ | |
6ce8e9ce | 318 | error = memcpy_from_msg(skb_put(skb, total_len), m, total_len); |
fd558d18 JC |
319 | if (error < 0) { |
320 | kfree_skb(skb); | |
7198c77a | 321 | goto error_put_sess; |
fd558d18 | 322 | } |
fd558d18 | 323 | |
455cc32b | 324 | local_bh_disable(); |
fd558d18 | 325 | l2tp_xmit_skb(session, skb, session->hdr_len); |
455cc32b | 326 | local_bh_enable(); |
fd558d18 | 327 | |
8b82547e | 328 | sock_put(sk); |
fd558d18 | 329 | |
a6f79d0f | 330 | return total_len; |
fd558d18 | 331 | |
fd558d18 JC |
332 | error_put_sess: |
333 | sock_put(sk); | |
334 | error: | |
335 | return error; | |
336 | } | |
337 | ||
338 | /* Transmit function called by generic PPP driver. Sends PPP frame | |
339 | * over PPPoL2TP socket. | |
340 | * | |
341 | * This is almost the same as pppol2tp_sendmsg(), but rather than | |
342 | * being called with a msghdr from userspace, it is called with a skb | |
343 | * from the kernel. | |
344 | * | |
345 | * The supplied skb from ppp doesn't have enough headroom for the | |
346 | * insertion of L2TP, UDP and IP headers so we need to allocate more | |
347 | * headroom in the skb. This will create a cloned skb. But we must be | |
348 | * careful in the error case because the caller will expect to free | |
349 | * the skb it supplied, not our cloned skb. So we take care to always | |
350 | * leave the original skb unfreed if we return an error. | |
351 | */ | |
352 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
353 | { | |
fd558d18 | 354 | struct sock *sk = (struct sock *) chan->private; |
fd558d18 JC |
355 | struct l2tp_session *session; |
356 | struct l2tp_tunnel *tunnel; | |
09df57ca | 357 | int uhlen, headroom; |
fd558d18 JC |
358 | |
359 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
360 | goto abort; | |
361 | ||
362 | /* Get session and tunnel contexts from the socket */ | |
363 | session = pppol2tp_sock_to_session(sk); | |
364 | if (session == NULL) | |
365 | goto abort; | |
366 | ||
7198c77a | 367 | tunnel = session->tunnel; |
fd558d18 | 368 | |
09df57ca ED |
369 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
370 | headroom = NET_SKB_PAD + | |
371 | sizeof(struct iphdr) + /* IP header */ | |
372 | uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */ | |
373 | session->hdr_len + /* L2TP header */ | |
54c151d9 | 374 | 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ |
09df57ca | 375 | if (skb_cow_head(skb, headroom)) |
7198c77a | 376 | goto abort_put_sess; |
fd558d18 | 377 | |
fd558d18 | 378 | /* Setup PPP header */ |
54c151d9 GF |
379 | __skb_push(skb, 2); |
380 | skb->data[0] = PPP_ALLSTATIONS; | |
381 | skb->data[1] = PPP_UI; | |
fd558d18 | 382 | |
455cc32b | 383 | local_bh_disable(); |
e0d4435f | 384 | l2tp_xmit_skb(session, skb, session->hdr_len); |
455cc32b | 385 | local_bh_enable(); |
fd558d18 | 386 | |
fd558d18 | 387 | sock_put(sk); |
7198c77a | 388 | |
fd558d18 JC |
389 | return 1; |
390 | ||
fd558d18 JC |
391 | abort_put_sess: |
392 | sock_put(sk); | |
393 | abort: | |
394 | /* Free the original skb */ | |
395 | kfree_skb(skb); | |
396 | return 1; | |
397 | } | |
398 | ||
399 | /***************************************************************************** | |
400 | * Session (and tunnel control) socket create/destroy. | |
401 | *****************************************************************************/ | |
402 | ||
d02ba2a6 JC |
403 | static void pppol2tp_put_sk(struct rcu_head *head) |
404 | { | |
405 | struct pppol2tp_session *ps; | |
406 | ||
407 | ps = container_of(head, typeof(*ps), rcu); | |
408 | sock_put(ps->__sk); | |
409 | } | |
410 | ||
fd558d18 JC |
411 | /* Really kill the session socket. (Called from sock_put() if |
412 | * refcnt == 0.) | |
413 | */ | |
414 | static void pppol2tp_session_destruct(struct sock *sk) | |
415 | { | |
f6e16b29 | 416 | struct l2tp_session *session = sk->sk_user_data; |
e91793bb GN |
417 | |
418 | skb_queue_purge(&sk->sk_receive_queue); | |
419 | skb_queue_purge(&sk->sk_write_queue); | |
420 | ||
f6e16b29 | 421 | if (session) { |
fd558d18 JC |
422 | sk->sk_user_data = NULL; |
423 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
424 | l2tp_session_dec_refcount(session); | |
425 | } | |
fd558d18 JC |
426 | } |
427 | ||
428 | /* Called when the PPPoX socket (session) is closed. | |
429 | */ | |
430 | static int pppol2tp_release(struct socket *sock) | |
431 | { | |
432 | struct sock *sk = sock->sk; | |
433 | struct l2tp_session *session; | |
434 | int error; | |
435 | ||
436 | if (!sk) | |
437 | return 0; | |
438 | ||
439 | error = -EBADF; | |
440 | lock_sock(sk); | |
441 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
442 | goto error; | |
443 | ||
444 | pppox_unbind_sock(sk); | |
445 | ||
446 | /* Signal the death of the socket. */ | |
447 | sk->sk_state = PPPOX_DEAD; | |
448 | sock_orphan(sk); | |
449 | sock->sk = NULL; | |
450 | ||
451 | session = pppol2tp_sock_to_session(sk); | |
d02ba2a6 | 452 | if (session) { |
3d609342 GN |
453 | struct pppol2tp_session *ps; |
454 | ||
f98be6c6 | 455 | l2tp_session_delete(session); |
3d609342 GN |
456 | |
457 | ps = l2tp_session_priv(session); | |
458 | mutex_lock(&ps->sk_lock); | |
459 | ps->__sk = rcu_dereference_protected(ps->sk, | |
460 | lockdep_is_held(&ps->sk_lock)); | |
461 | RCU_INIT_POINTER(ps->sk, NULL); | |
462 | mutex_unlock(&ps->sk_lock); | |
463 | call_rcu(&ps->rcu, pppol2tp_put_sk); | |
464 | ||
465 | /* Rely on the sock_put() call at the end of the function for | |
466 | * dropping the reference held by pppol2tp_sock_to_session(). | |
467 | * The last reference will be dropped by pppol2tp_put_sk(). | |
468 | */ | |
fd558d18 | 469 | } |
d02ba2a6 | 470 | |
fd558d18 JC |
471 | release_sock(sk); |
472 | ||
473 | /* This will delete the session context via | |
474 | * pppol2tp_session_destruct() if the socket's refcnt drops to | |
475 | * zero. | |
476 | */ | |
477 | sock_put(sk); | |
478 | ||
479 | return 0; | |
480 | ||
481 | error: | |
482 | release_sock(sk); | |
483 | return error; | |
484 | } | |
485 | ||
486 | static struct proto pppol2tp_sk_proto = { | |
487 | .name = "PPPOL2TP", | |
488 | .owner = THIS_MODULE, | |
489 | .obj_size = sizeof(struct pppox_sock), | |
490 | }; | |
491 | ||
492 | static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
493 | { | |
494 | int rc; | |
495 | ||
496 | rc = l2tp_udp_encap_recv(sk, skb); | |
497 | if (rc) | |
498 | kfree_skb(skb); | |
499 | ||
500 | return NET_RX_SUCCESS; | |
501 | } | |
502 | ||
503 | /* socket() handler. Initialize a new struct sock. | |
504 | */ | |
11aa9c28 | 505 | static int pppol2tp_create(struct net *net, struct socket *sock, int kern) |
fd558d18 JC |
506 | { |
507 | int error = -ENOMEM; | |
508 | struct sock *sk; | |
509 | ||
11aa9c28 | 510 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern); |
fd558d18 JC |
511 | if (!sk) |
512 | goto out; | |
513 | ||
514 | sock_init_data(sock, sk); | |
515 | ||
516 | sock->state = SS_UNCONNECTED; | |
517 | sock->ops = &pppol2tp_ops; | |
518 | ||
519 | sk->sk_backlog_rcv = pppol2tp_backlog_recv; | |
520 | sk->sk_protocol = PX_PROTO_OL2TP; | |
521 | sk->sk_family = PF_PPPOX; | |
522 | sk->sk_state = PPPOX_NONE; | |
523 | sk->sk_type = SOCK_STREAM; | |
524 | sk->sk_destruct = pppol2tp_session_destruct; | |
525 | ||
526 | error = 0; | |
527 | ||
528 | out: | |
529 | return error; | |
530 | } | |
531 | ||
0ad66140 JC |
532 | static void pppol2tp_show(struct seq_file *m, void *arg) |
533 | { | |
534 | struct l2tp_session *session = arg; | |
ee40fb2e GN |
535 | struct sock *sk; |
536 | ||
537 | sk = pppol2tp_session_get_sock(session); | |
538 | if (sk) { | |
539 | struct pppox_sock *po = pppox_sk(sk); | |
0ad66140 | 540 | |
ee40fb2e GN |
541 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); |
542 | sock_put(sk); | |
0ad66140 JC |
543 | } |
544 | } | |
0ad66140 | 545 | |
f98be6c6 GN |
546 | static void pppol2tp_session_init(struct l2tp_session *session) |
547 | { | |
548 | struct pppol2tp_session *ps; | |
f98be6c6 GN |
549 | |
550 | session->recv_skb = pppol2tp_recv; | |
c2ebc256 AB |
551 | if (IS_ENABLED(CONFIG_L2TP_DEBUGFS)) |
552 | session->show = pppol2tp_show; | |
f98be6c6 GN |
553 | |
554 | ps = l2tp_session_priv(session); | |
555 | mutex_init(&ps->sk_lock); | |
f98be6c6 | 556 | ps->owner = current->pid; |
f98be6c6 GN |
557 | } |
558 | ||
a408194a GN |
559 | struct l2tp_connect_info { |
560 | u8 version; | |
561 | int fd; | |
562 | u32 tunnel_id; | |
563 | u32 peer_tunnel_id; | |
564 | u32 session_id; | |
565 | u32 peer_session_id; | |
566 | }; | |
567 | ||
568 | static int pppol2tp_sockaddr_get_info(const void *sa, int sa_len, | |
569 | struct l2tp_connect_info *info) | |
570 | { | |
571 | switch (sa_len) { | |
572 | case sizeof(struct sockaddr_pppol2tp): | |
573 | { | |
574 | const struct sockaddr_pppol2tp *sa_v2in4 = sa; | |
575 | ||
576 | if (sa_v2in4->sa_protocol != PX_PROTO_OL2TP) | |
577 | return -EINVAL; | |
578 | ||
579 | info->version = 2; | |
580 | info->fd = sa_v2in4->pppol2tp.fd; | |
581 | info->tunnel_id = sa_v2in4->pppol2tp.s_tunnel; | |
582 | info->peer_tunnel_id = sa_v2in4->pppol2tp.d_tunnel; | |
583 | info->session_id = sa_v2in4->pppol2tp.s_session; | |
584 | info->peer_session_id = sa_v2in4->pppol2tp.d_session; | |
585 | ||
586 | break; | |
587 | } | |
588 | case sizeof(struct sockaddr_pppol2tpv3): | |
589 | { | |
590 | const struct sockaddr_pppol2tpv3 *sa_v3in4 = sa; | |
591 | ||
592 | if (sa_v3in4->sa_protocol != PX_PROTO_OL2TP) | |
593 | return -EINVAL; | |
594 | ||
595 | info->version = 3; | |
596 | info->fd = sa_v3in4->pppol2tp.fd; | |
597 | info->tunnel_id = sa_v3in4->pppol2tp.s_tunnel; | |
598 | info->peer_tunnel_id = sa_v3in4->pppol2tp.d_tunnel; | |
599 | info->session_id = sa_v3in4->pppol2tp.s_session; | |
600 | info->peer_session_id = sa_v3in4->pppol2tp.d_session; | |
601 | ||
602 | break; | |
603 | } | |
604 | case sizeof(struct sockaddr_pppol2tpin6): | |
605 | { | |
606 | const struct sockaddr_pppol2tpin6 *sa_v2in6 = sa; | |
607 | ||
608 | if (sa_v2in6->sa_protocol != PX_PROTO_OL2TP) | |
609 | return -EINVAL; | |
610 | ||
611 | info->version = 2; | |
612 | info->fd = sa_v2in6->pppol2tp.fd; | |
613 | info->tunnel_id = sa_v2in6->pppol2tp.s_tunnel; | |
614 | info->peer_tunnel_id = sa_v2in6->pppol2tp.d_tunnel; | |
615 | info->session_id = sa_v2in6->pppol2tp.s_session; | |
616 | info->peer_session_id = sa_v2in6->pppol2tp.d_session; | |
617 | ||
618 | break; | |
619 | } | |
620 | case sizeof(struct sockaddr_pppol2tpv3in6): | |
621 | { | |
622 | const struct sockaddr_pppol2tpv3in6 *sa_v3in6 = sa; | |
623 | ||
624 | if (sa_v3in6->sa_protocol != PX_PROTO_OL2TP) | |
625 | return -EINVAL; | |
626 | ||
627 | info->version = 3; | |
628 | info->fd = sa_v3in6->pppol2tp.fd; | |
629 | info->tunnel_id = sa_v3in6->pppol2tp.s_tunnel; | |
630 | info->peer_tunnel_id = sa_v3in6->pppol2tp.d_tunnel; | |
631 | info->session_id = sa_v3in6->pppol2tp.s_session; | |
632 | info->peer_session_id = sa_v3in6->pppol2tp.d_session; | |
633 | ||
634 | break; | |
635 | } | |
636 | default: | |
637 | return -EINVAL; | |
638 | } | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
789141b2 GN |
643 | /* Rough estimation of the maximum payload size a tunnel can transmit without |
644 | * fragmenting at the lower IP layer. Assumes L2TPv2 with sequence | |
645 | * numbers and no IP option. Not quite accurate, but the result is mostly | |
646 | * unused anyway. | |
647 | */ | |
648 | static int pppol2tp_tunnel_mtu(const struct l2tp_tunnel *tunnel) | |
649 | { | |
650 | int mtu; | |
651 | ||
652 | mtu = l2tp_tunnel_dst_mtu(tunnel); | |
653 | if (mtu <= PPPOL2TP_HEADER_OVERHEAD) | |
654 | return 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
655 | ||
656 | return mtu - PPPOL2TP_HEADER_OVERHEAD; | |
657 | } | |
658 | ||
fd558d18 JC |
659 | /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket |
660 | */ | |
661 | static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
662 | int sockaddr_len, int flags) | |
663 | { | |
664 | struct sock *sk = sock->sk; | |
fd558d18 JC |
665 | struct pppox_sock *po = pppox_sk(sk); |
666 | struct l2tp_session *session = NULL; | |
a408194a | 667 | struct l2tp_connect_info info; |
fd558d18 JC |
668 | struct l2tp_tunnel *tunnel; |
669 | struct pppol2tp_session *ps; | |
fd558d18 | 670 | struct l2tp_session_cfg cfg = { 0, }; |
dbdbc73b | 671 | bool drop_refcnt = false; |
f9e56baf | 672 | bool drop_tunnel = false; |
bda06be2 GN |
673 | bool new_session = false; |
674 | bool new_tunnel = false; | |
a408194a | 675 | int error; |
eb1c28c0 | 676 | |
a408194a GN |
677 | error = pppol2tp_sockaddr_get_info(uservaddr, sockaddr_len, &info); |
678 | if (error < 0) | |
679 | return error; | |
eb1c28c0 | 680 | |
a408194a | 681 | lock_sock(sk); |
fd558d18 JC |
682 | |
683 | /* Check for already bound sockets */ | |
684 | error = -EBUSY; | |
685 | if (sk->sk_state & PPPOX_CONNECTED) | |
686 | goto end; | |
687 | ||
688 | /* We don't supporting rebinding anyway */ | |
689 | error = -EALREADY; | |
690 | if (sk->sk_user_data) | |
691 | goto end; /* socket is already attached */ | |
692 | ||
e0d4435f | 693 | /* Don't bind if tunnel_id is 0 */ |
fd558d18 | 694 | error = -EINVAL; |
a408194a | 695 | if (!info.tunnel_id) |
fd558d18 JC |
696 | goto end; |
697 | ||
a408194a | 698 | tunnel = l2tp_tunnel_get(sock_net(sk), info.tunnel_id); |
f9e56baf GN |
699 | if (tunnel) |
700 | drop_tunnel = true; | |
309795f4 | 701 | |
e0d4435f JC |
702 | /* Special case: create tunnel context if session_id and |
703 | * peer_session_id is 0. Otherwise look up tunnel using supplied | |
fd558d18 JC |
704 | * tunnel id. |
705 | */ | |
a408194a | 706 | if (!info.session_id && !info.peer_session_id) { |
309795f4 JC |
707 | if (tunnel == NULL) { |
708 | struct l2tp_tunnel_cfg tcfg = { | |
709 | .encap = L2TP_ENCAPTYPE_UDP, | |
710 | .debug = 0, | |
711 | }; | |
3e1bc8bf GN |
712 | |
713 | /* Prevent l2tp_tunnel_register() from trying to set up | |
714 | * a kernel socket. | |
715 | */ | |
a408194a | 716 | if (info.fd < 0) { |
3e1bc8bf GN |
717 | error = -EBADF; |
718 | goto end; | |
719 | } | |
720 | ||
a408194a GN |
721 | error = l2tp_tunnel_create(sock_net(sk), info.fd, |
722 | info.version, | |
723 | info.tunnel_id, | |
724 | info.peer_tunnel_id, &tcfg, | |
725 | &tunnel); | |
309795f4 JC |
726 | if (error < 0) |
727 | goto end; | |
6b9f3423 GN |
728 | |
729 | l2tp_tunnel_inc_refcount(tunnel); | |
730 | error = l2tp_tunnel_register(tunnel, sock_net(sk), | |
731 | &tcfg); | |
732 | if (error < 0) { | |
733 | kfree(tunnel); | |
734 | goto end; | |
735 | } | |
736 | drop_tunnel = true; | |
bda06be2 | 737 | new_tunnel = true; |
309795f4 | 738 | } |
fd558d18 | 739 | } else { |
fd558d18 JC |
740 | /* Error if we can't find the tunnel */ |
741 | error = -ENOENT; | |
742 | if (tunnel == NULL) | |
743 | goto end; | |
744 | ||
745 | /* Error if socket is not prepped */ | |
746 | if (tunnel->sock == NULL) | |
747 | goto end; | |
748 | } | |
749 | ||
b79585f5 | 750 | if (tunnel->peer_tunnel_id == 0) |
a408194a | 751 | tunnel->peer_tunnel_id = info.peer_tunnel_id; |
fd558d18 | 752 | |
01e28b92 | 753 | session = l2tp_tunnel_get_session(tunnel, info.session_id); |
dbdbc73b GN |
754 | if (session) { |
755 | drop_refcnt = true; | |
7ac6ab1f GN |
756 | |
757 | if (session->pwtype != L2TP_PWTYPE_PPP) { | |
758 | error = -EPROTOTYPE; | |
759 | goto end; | |
760 | } | |
761 | ||
dbdbc73b GN |
762 | ps = l2tp_session_priv(session); |
763 | ||
764 | /* Using a pre-existing session is fine as long as it hasn't | |
765 | * been connected yet. | |
309795f4 | 766 | */ |
ee40fb2e GN |
767 | mutex_lock(&ps->sk_lock); |
768 | if (rcu_dereference_protected(ps->sk, | |
3d609342 GN |
769 | lockdep_is_held(&ps->sk_lock)) || |
770 | ps->__sk) { | |
ee40fb2e | 771 | mutex_unlock(&ps->sk_lock); |
dbdbc73b GN |
772 | error = -EEXIST; |
773 | goto end; | |
774 | } | |
309795f4 | 775 | } else { |
90904ff5 | 776 | cfg.pw_type = L2TP_PWTYPE_PPP; |
309795f4 | 777 | |
dbdbc73b | 778 | session = l2tp_session_create(sizeof(struct pppol2tp_session), |
a408194a GN |
779 | tunnel, info.session_id, |
780 | info.peer_session_id, &cfg); | |
dbdbc73b GN |
781 | if (IS_ERR(session)) { |
782 | error = PTR_ERR(session); | |
309795f4 | 783 | goto end; |
dbdbc73b | 784 | } |
3953ae7b | 785 | |
f98be6c6 | 786 | pppol2tp_session_init(session); |
ee40fb2e | 787 | ps = l2tp_session_priv(session); |
3953ae7b | 788 | l2tp_session_inc_refcount(session); |
ee40fb2e GN |
789 | |
790 | mutex_lock(&ps->sk_lock); | |
3953ae7b GN |
791 | error = l2tp_session_register(session, tunnel); |
792 | if (error < 0) { | |
ee40fb2e | 793 | mutex_unlock(&ps->sk_lock); |
3953ae7b GN |
794 | kfree(session); |
795 | goto end; | |
796 | } | |
797 | drop_refcnt = true; | |
bda06be2 | 798 | new_session = true; |
fd558d18 JC |
799 | } |
800 | ||
fd558d18 JC |
801 | /* Special case: if source & dest session_id == 0x0000, this |
802 | * socket is being created to manage the tunnel. Just set up | |
803 | * the internal context for use by ioctl() and sockopt() | |
804 | * handlers. | |
805 | */ | |
806 | if ((session->session_id == 0) && | |
807 | (session->peer_session_id == 0)) { | |
808 | error = 0; | |
809 | goto out_no_ppp; | |
810 | } | |
811 | ||
812 | /* The only header we need to worry about is the L2TP | |
813 | * header. This size is different depending on whether | |
814 | * sequence numbers are enabled for the data channel. | |
815 | */ | |
816 | po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
817 | ||
818 | po->chan.private = sk; | |
819 | po->chan.ops = &pppol2tp_chan_ops; | |
789141b2 | 820 | po->chan.mtu = pppol2tp_tunnel_mtu(tunnel); |
fd558d18 JC |
821 | |
822 | error = ppp_register_net_channel(sock_net(sk), &po->chan); | |
ee40fb2e GN |
823 | if (error) { |
824 | mutex_unlock(&ps->sk_lock); | |
fd558d18 | 825 | goto end; |
ee40fb2e | 826 | } |
fd558d18 JC |
827 | |
828 | out_no_ppp: | |
829 | /* This is how we get the session context from the socket. */ | |
830 | sk->sk_user_data = session; | |
ee40fb2e GN |
831 | rcu_assign_pointer(ps->sk, sk); |
832 | mutex_unlock(&ps->sk_lock); | |
833 | ||
f98be6c6 GN |
834 | /* Keep the reference we've grabbed on the session: sk doesn't expect |
835 | * the session to disappear. pppol2tp_session_destruct() is responsible | |
836 | * for dropping it. | |
837 | */ | |
838 | drop_refcnt = false; | |
839 | ||
fd558d18 | 840 | sk->sk_state = PPPOX_CONNECTED; |
fba40c63 | 841 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: created\n", |
a4ca44fa | 842 | session->name); |
fd558d18 JC |
843 | |
844 | end: | |
bda06be2 GN |
845 | if (error) { |
846 | if (new_session) | |
847 | l2tp_session_delete(session); | |
848 | if (new_tunnel) | |
849 | l2tp_tunnel_delete(tunnel); | |
850 | } | |
dbdbc73b GN |
851 | if (drop_refcnt) |
852 | l2tp_session_dec_refcount(session); | |
f9e56baf GN |
853 | if (drop_tunnel) |
854 | l2tp_tunnel_dec_refcount(tunnel); | |
fd558d18 JC |
855 | release_sock(sk); |
856 | ||
857 | return error; | |
858 | } | |
859 | ||
309795f4 JC |
860 | #ifdef CONFIG_L2TP_V3 |
861 | ||
f026bc29 GN |
862 | /* Called when creating sessions via the netlink interface. */ |
863 | static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel, | |
864 | u32 session_id, u32 peer_session_id, | |
865 | struct l2tp_session_cfg *cfg) | |
309795f4 JC |
866 | { |
867 | int error; | |
309795f4 | 868 | struct l2tp_session *session; |
309795f4 | 869 | |
309795f4 | 870 | /* Error if tunnel socket is not prepped */ |
f026bc29 GN |
871 | if (!tunnel->sock) { |
872 | error = -ENOENT; | |
3953ae7b | 873 | goto err; |
f026bc29 | 874 | } |
309795f4 | 875 | |
309795f4 | 876 | /* Allocate and initialize a new session context. */ |
309795f4 JC |
877 | session = l2tp_session_create(sizeof(struct pppol2tp_session), |
878 | tunnel, session_id, | |
879 | peer_session_id, cfg); | |
dbdbc73b GN |
880 | if (IS_ERR(session)) { |
881 | error = PTR_ERR(session); | |
3953ae7b | 882 | goto err; |
dbdbc73b | 883 | } |
309795f4 | 884 | |
f98be6c6 | 885 | pppol2tp_session_init(session); |
309795f4 | 886 | |
3953ae7b GN |
887 | error = l2tp_session_register(session, tunnel); |
888 | if (error < 0) | |
889 | goto err_sess; | |
309795f4 | 890 | |
3953ae7b | 891 | return 0; |
309795f4 | 892 | |
3953ae7b GN |
893 | err_sess: |
894 | kfree(session); | |
895 | err: | |
309795f4 JC |
896 | return error; |
897 | } | |
898 | ||
309795f4 JC |
899 | #endif /* CONFIG_L2TP_V3 */ |
900 | ||
fd558d18 JC |
901 | /* getname() support. |
902 | */ | |
903 | static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, | |
9b2c45d4 | 904 | int peer) |
fd558d18 | 905 | { |
e0d4435f | 906 | int len = 0; |
fd558d18 JC |
907 | int error = 0; |
908 | struct l2tp_session *session; | |
909 | struct l2tp_tunnel *tunnel; | |
910 | struct sock *sk = sock->sk; | |
911 | struct inet_sock *inet; | |
912 | struct pppol2tp_session *pls; | |
913 | ||
914 | error = -ENOTCONN; | |
915 | if (sk == NULL) | |
916 | goto end; | |
56cff471 | 917 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
fd558d18 JC |
918 | goto end; |
919 | ||
920 | error = -EBADF; | |
921 | session = pppol2tp_sock_to_session(sk); | |
922 | if (session == NULL) | |
923 | goto end; | |
924 | ||
925 | pls = l2tp_session_priv(session); | |
7198c77a | 926 | tunnel = session->tunnel; |
fd558d18 | 927 | |
bbdb32cb | 928 | inet = inet_sk(tunnel->sock); |
d2cf3361 | 929 | if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) { |
e0d4435f JC |
930 | struct sockaddr_pppol2tp sp; |
931 | len = sizeof(sp); | |
932 | memset(&sp, 0, len); | |
933 | sp.sa_family = AF_PPPOX; | |
934 | sp.sa_protocol = PX_PROTO_OL2TP; | |
935 | sp.pppol2tp.fd = tunnel->fd; | |
936 | sp.pppol2tp.pid = pls->owner; | |
937 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
938 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
939 | sp.pppol2tp.s_session = session->session_id; | |
940 | sp.pppol2tp.d_session = session->peer_session_id; | |
941 | sp.pppol2tp.addr.sin_family = AF_INET; | |
942 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
943 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
944 | memcpy(uaddr, &sp, len); | |
d2cf3361 BL |
945 | #if IS_ENABLED(CONFIG_IPV6) |
946 | } else if ((tunnel->version == 2) && | |
947 | (tunnel->sock->sk_family == AF_INET6)) { | |
d2cf3361 | 948 | struct sockaddr_pppol2tpin6 sp; |
efe4208f | 949 | |
d2cf3361 BL |
950 | len = sizeof(sp); |
951 | memset(&sp, 0, len); | |
952 | sp.sa_family = AF_PPPOX; | |
953 | sp.sa_protocol = PX_PROTO_OL2TP; | |
954 | sp.pppol2tp.fd = tunnel->fd; | |
955 | sp.pppol2tp.pid = pls->owner; | |
956 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
957 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
958 | sp.pppol2tp.s_session = session->session_id; | |
959 | sp.pppol2tp.d_session = session->peer_session_id; | |
960 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
961 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
efe4208f ED |
962 | memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr, |
963 | sizeof(tunnel->sock->sk_v6_daddr)); | |
d2cf3361 BL |
964 | memcpy(uaddr, &sp, len); |
965 | } else if ((tunnel->version == 3) && | |
966 | (tunnel->sock->sk_family == AF_INET6)) { | |
d2cf3361 | 967 | struct sockaddr_pppol2tpv3in6 sp; |
efe4208f | 968 | |
d2cf3361 BL |
969 | len = sizeof(sp); |
970 | memset(&sp, 0, len); | |
971 | sp.sa_family = AF_PPPOX; | |
972 | sp.sa_protocol = PX_PROTO_OL2TP; | |
973 | sp.pppol2tp.fd = tunnel->fd; | |
974 | sp.pppol2tp.pid = pls->owner; | |
975 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
976 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
977 | sp.pppol2tp.s_session = session->session_id; | |
978 | sp.pppol2tp.d_session = session->peer_session_id; | |
979 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
980 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
efe4208f ED |
981 | memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr, |
982 | sizeof(tunnel->sock->sk_v6_daddr)); | |
d2cf3361 BL |
983 | memcpy(uaddr, &sp, len); |
984 | #endif | |
e0d4435f JC |
985 | } else if (tunnel->version == 3) { |
986 | struct sockaddr_pppol2tpv3 sp; | |
987 | len = sizeof(sp); | |
988 | memset(&sp, 0, len); | |
989 | sp.sa_family = AF_PPPOX; | |
990 | sp.sa_protocol = PX_PROTO_OL2TP; | |
991 | sp.pppol2tp.fd = tunnel->fd; | |
992 | sp.pppol2tp.pid = pls->owner; | |
993 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
994 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
995 | sp.pppol2tp.s_session = session->session_id; | |
996 | sp.pppol2tp.d_session = session->peer_session_id; | |
997 | sp.pppol2tp.addr.sin_family = AF_INET; | |
998 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
999 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
1000 | memcpy(uaddr, &sp, len); | |
1001 | } | |
fd558d18 | 1002 | |
9b2c45d4 | 1003 | error = len; |
fd558d18 | 1004 | |
fd558d18 | 1005 | sock_put(sk); |
fd558d18 JC |
1006 | end: |
1007 | return error; | |
1008 | } | |
1009 | ||
1010 | /**************************************************************************** | |
1011 | * ioctl() handlers. | |
1012 | * | |
1013 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1014 | * sockets. However, in order to control kernel tunnel features, we allow | |
1015 | * userspace to create a special "tunnel" PPPoX socket which is used for | |
1016 | * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow | |
1017 | * the user application to issue L2TP setsockopt(), getsockopt() and ioctl() | |
1018 | * calls. | |
1019 | ****************************************************************************/ | |
1020 | ||
1021 | static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest, | |
7390ed8a | 1022 | const struct l2tp_stats *stats) |
fd558d18 | 1023 | { |
7390ed8a GN |
1024 | memset(dest, 0, sizeof(*dest)); |
1025 | ||
7b7c0719 TP |
1026 | dest->tx_packets = atomic_long_read(&stats->tx_packets); |
1027 | dest->tx_bytes = atomic_long_read(&stats->tx_bytes); | |
1028 | dest->tx_errors = atomic_long_read(&stats->tx_errors); | |
1029 | dest->rx_packets = atomic_long_read(&stats->rx_packets); | |
1030 | dest->rx_bytes = atomic_long_read(&stats->rx_bytes); | |
1031 | dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards); | |
1032 | dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets); | |
1033 | dest->rx_errors = atomic_long_read(&stats->rx_errors); | |
fd558d18 JC |
1034 | } |
1035 | ||
528534f0 GN |
1036 | static int pppol2tp_tunnel_copy_stats(struct pppol2tp_ioc_stats *stats, |
1037 | struct l2tp_tunnel *tunnel) | |
1038 | { | |
1039 | struct l2tp_session *session; | |
1040 | ||
1041 | if (!stats->session_id) { | |
528534f0 GN |
1042 | pppol2tp_copy_stats(stats, &tunnel->stats); |
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | /* If session_id is set, search the corresponding session in the | |
1047 | * context of this tunnel and record the session's statistics. | |
1048 | */ | |
1049 | session = l2tp_tunnel_get_session(tunnel, stats->session_id); | |
1050 | if (!session) | |
1051 | return -EBADR; | |
1052 | ||
1053 | if (session->pwtype != L2TP_PWTYPE_PPP) { | |
1054 | l2tp_session_dec_refcount(session); | |
1055 | return -EBADR; | |
1056 | } | |
1057 | ||
528534f0 GN |
1058 | pppol2tp_copy_stats(stats, &session->stats); |
1059 | l2tp_session_dec_refcount(session); | |
1060 | ||
1061 | return 0; | |
1062 | } | |
1063 | ||
fd558d18 JC |
1064 | static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, |
1065 | unsigned long arg) | |
1066 | { | |
528534f0 | 1067 | struct pppol2tp_ioc_stats stats; |
fd558d18 | 1068 | struct l2tp_session *session; |
79e6760e GN |
1069 | |
1070 | switch (cmd) { | |
1071 | case PPPIOCGMRU: | |
1072 | case PPPIOCGFLAGS: | |
1073 | session = sock->sk->sk_user_data; | |
1074 | if (!session) | |
1075 | return -ENOTCONN; | |
fd558d18 | 1076 | |
79e6760e GN |
1077 | /* Not defined for tunnels */ |
1078 | if (!session->session_id && !session->peer_session_id) | |
1079 | return -ENOSYS; | |
fd558d18 | 1080 | |
79e6760e GN |
1081 | if (put_user(0, (int __user *)arg)) |
1082 | return -EFAULT; | |
1083 | break; | |
1084 | ||
1085 | case PPPIOCSMRU: | |
1086 | case PPPIOCSFLAGS: | |
1087 | session = sock->sk->sk_user_data; | |
1088 | if (!session) | |
1089 | return -ENOTCONN; | |
fd558d18 | 1090 | |
79e6760e GN |
1091 | /* Not defined for tunnels */ |
1092 | if (!session->session_id && !session->peer_session_id) | |
1093 | return -ENOSYS; | |
1094 | ||
503c0188 | 1095 | if (!access_ok((int __user *)arg, sizeof(int))) |
79e6760e GN |
1096 | return -EFAULT; |
1097 | break; | |
1098 | ||
1099 | case PPPIOCGL2TPSTATS: | |
1100 | session = sock->sk->sk_user_data; | |
1101 | if (!session) | |
1102 | return -ENOTCONN; | |
1103 | ||
1104 | /* Session 0 represents the parent tunnel */ | |
528534f0 GN |
1105 | if (!session->session_id && !session->peer_session_id) { |
1106 | u32 session_id; | |
1107 | int err; | |
1108 | ||
1109 | if (copy_from_user(&stats, (void __user *)arg, | |
1110 | sizeof(stats))) | |
1111 | return -EFAULT; | |
1112 | ||
1113 | session_id = stats.session_id; | |
1114 | err = pppol2tp_tunnel_copy_stats(&stats, | |
1115 | session->tunnel); | |
1116 | if (err < 0) | |
1117 | return err; | |
1118 | ||
1119 | stats.session_id = session_id; | |
1120 | } else { | |
b0e29063 GN |
1121 | pppol2tp_copy_stats(&stats, &session->stats); |
1122 | stats.session_id = session->session_id; | |
528534f0 GN |
1123 | } |
1124 | stats.tunnel_id = session->tunnel->tunnel_id; | |
1125 | stats.using_ipsec = l2tp_tunnel_uses_xfrm(session->tunnel); | |
1126 | ||
1127 | if (copy_to_user((void __user *)arg, &stats, sizeof(stats))) | |
1128 | return -EFAULT; | |
79e6760e GN |
1129 | break; |
1130 | ||
1131 | default: | |
4f5f85e9 | 1132 | return -ENOIOCTLCMD; |
bdd0292f | 1133 | } |
fd558d18 | 1134 | |
79e6760e | 1135 | return 0; |
fd558d18 JC |
1136 | } |
1137 | ||
1138 | /***************************************************************************** | |
1139 | * setsockopt() / getsockopt() support. | |
1140 | * | |
1141 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1142 | * sockets. In order to control kernel tunnel features, we allow userspace to | |
1143 | * create a special "tunnel" PPPoX socket which is used for control only. | |
1144 | * Tunnel PPPoX sockets have session_id == 0 and simply allow the user | |
1145 | * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls. | |
1146 | *****************************************************************************/ | |
1147 | ||
1148 | /* Tunnel setsockopt() helper. | |
1149 | */ | |
1150 | static int pppol2tp_tunnel_setsockopt(struct sock *sk, | |
1151 | struct l2tp_tunnel *tunnel, | |
1152 | int optname, int val) | |
1153 | { | |
1154 | int err = 0; | |
1155 | ||
1156 | switch (optname) { | |
1157 | case PPPOL2TP_SO_DEBUG: | |
1158 | tunnel->debug = val; | |
fba40c63 | 1159 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: set debug=%x\n", |
a4ca44fa | 1160 | tunnel->name, tunnel->debug); |
fd558d18 JC |
1161 | break; |
1162 | ||
1163 | default: | |
1164 | err = -ENOPROTOOPT; | |
1165 | break; | |
1166 | } | |
1167 | ||
1168 | return err; | |
1169 | } | |
1170 | ||
1171 | /* Session setsockopt helper. | |
1172 | */ | |
1173 | static int pppol2tp_session_setsockopt(struct sock *sk, | |
1174 | struct l2tp_session *session, | |
1175 | int optname, int val) | |
1176 | { | |
1177 | int err = 0; | |
fd558d18 JC |
1178 | |
1179 | switch (optname) { | |
1180 | case PPPOL2TP_SO_RECVSEQ: | |
1181 | if ((val != 0) && (val != 1)) { | |
1182 | err = -EINVAL; | |
1183 | break; | |
1184 | } | |
3f9b9770 | 1185 | session->recv_seq = !!val; |
fba40c63 | 1186 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1187 | "%s: set recv_seq=%d\n", |
1188 | session->name, session->recv_seq); | |
fd558d18 JC |
1189 | break; |
1190 | ||
1191 | case PPPOL2TP_SO_SENDSEQ: | |
1192 | if ((val != 0) && (val != 1)) { | |
1193 | err = -EINVAL; | |
1194 | break; | |
1195 | } | |
3f9b9770 | 1196 | session->send_seq = !!val; |
fd558d18 | 1197 | { |
ee40fb2e GN |
1198 | struct pppox_sock *po = pppox_sk(sk); |
1199 | ||
fd558d18 JC |
1200 | po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ : |
1201 | PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
1202 | } | |
bb5016ea | 1203 | l2tp_session_set_header_len(session, session->tunnel->version); |
fba40c63 | 1204 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1205 | "%s: set send_seq=%d\n", |
1206 | session->name, session->send_seq); | |
fd558d18 JC |
1207 | break; |
1208 | ||
1209 | case PPPOL2TP_SO_LNSMODE: | |
1210 | if ((val != 0) && (val != 1)) { | |
1211 | err = -EINVAL; | |
1212 | break; | |
1213 | } | |
3f9b9770 | 1214 | session->lns_mode = !!val; |
fba40c63 | 1215 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1216 | "%s: set lns_mode=%d\n", |
1217 | session->name, session->lns_mode); | |
fd558d18 JC |
1218 | break; |
1219 | ||
1220 | case PPPOL2TP_SO_DEBUG: | |
1221 | session->debug = val; | |
fba40c63 | 1222 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: set debug=%x\n", |
a4ca44fa | 1223 | session->name, session->debug); |
fd558d18 JC |
1224 | break; |
1225 | ||
1226 | case PPPOL2TP_SO_REORDERTO: | |
1227 | session->reorder_timeout = msecs_to_jiffies(val); | |
fba40c63 | 1228 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa JP |
1229 | "%s: set reorder_timeout=%d\n", |
1230 | session->name, session->reorder_timeout); | |
fd558d18 JC |
1231 | break; |
1232 | ||
1233 | default: | |
1234 | err = -ENOPROTOOPT; | |
1235 | break; | |
1236 | } | |
1237 | ||
1238 | return err; | |
1239 | } | |
1240 | ||
1241 | /* Main setsockopt() entry point. | |
1242 | * Does API checks, then calls either the tunnel or session setsockopt | |
1243 | * handler, according to whether the PPPoL2TP socket is a for a regular | |
1244 | * session or the special tunnel type. | |
1245 | */ | |
1246 | static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, | |
1247 | char __user *optval, unsigned int optlen) | |
1248 | { | |
1249 | struct sock *sk = sock->sk; | |
1250 | struct l2tp_session *session; | |
1251 | struct l2tp_tunnel *tunnel; | |
fd558d18 JC |
1252 | int val; |
1253 | int err; | |
1254 | ||
1255 | if (level != SOL_PPPOL2TP) | |
3cf521f7 | 1256 | return -EINVAL; |
fd558d18 JC |
1257 | |
1258 | if (optlen < sizeof(int)) | |
1259 | return -EINVAL; | |
1260 | ||
1261 | if (get_user(val, (int __user *)optval)) | |
1262 | return -EFAULT; | |
1263 | ||
1264 | err = -ENOTCONN; | |
1265 | if (sk->sk_user_data == NULL) | |
1266 | goto end; | |
1267 | ||
1268 | /* Get session context from the socket */ | |
1269 | err = -EBADF; | |
1270 | session = pppol2tp_sock_to_session(sk); | |
1271 | if (session == NULL) | |
1272 | goto end; | |
1273 | ||
1274 | /* Special case: if session_id == 0x0000, treat as operation on tunnel | |
1275 | */ | |
fd558d18 JC |
1276 | if ((session->session_id == 0) && |
1277 | (session->peer_session_id == 0)) { | |
7198c77a | 1278 | tunnel = session->tunnel; |
fd558d18 | 1279 | err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); |
7198c77a | 1280 | } else { |
fd558d18 | 1281 | err = pppol2tp_session_setsockopt(sk, session, optname, val); |
7198c77a | 1282 | } |
fd558d18 | 1283 | |
fd558d18 JC |
1284 | sock_put(sk); |
1285 | end: | |
1286 | return err; | |
1287 | } | |
1288 | ||
1289 | /* Tunnel getsockopt helper. Called with sock locked. | |
1290 | */ | |
1291 | static int pppol2tp_tunnel_getsockopt(struct sock *sk, | |
1292 | struct l2tp_tunnel *tunnel, | |
1293 | int optname, int *val) | |
1294 | { | |
1295 | int err = 0; | |
1296 | ||
1297 | switch (optname) { | |
1298 | case PPPOL2TP_SO_DEBUG: | |
1299 | *val = tunnel->debug; | |
fba40c63 | 1300 | l2tp_info(tunnel, L2TP_MSG_CONTROL, "%s: get debug=%x\n", |
a4ca44fa | 1301 | tunnel->name, tunnel->debug); |
fd558d18 JC |
1302 | break; |
1303 | ||
1304 | default: | |
1305 | err = -ENOPROTOOPT; | |
1306 | break; | |
1307 | } | |
1308 | ||
1309 | return err; | |
1310 | } | |
1311 | ||
1312 | /* Session getsockopt helper. Called with sock locked. | |
1313 | */ | |
1314 | static int pppol2tp_session_getsockopt(struct sock *sk, | |
1315 | struct l2tp_session *session, | |
1316 | int optname, int *val) | |
1317 | { | |
1318 | int err = 0; | |
1319 | ||
1320 | switch (optname) { | |
1321 | case PPPOL2TP_SO_RECVSEQ: | |
1322 | *val = session->recv_seq; | |
fba40c63 | 1323 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1324 | "%s: get recv_seq=%d\n", session->name, *val); |
fd558d18 JC |
1325 | break; |
1326 | ||
1327 | case PPPOL2TP_SO_SENDSEQ: | |
1328 | *val = session->send_seq; | |
fba40c63 | 1329 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1330 | "%s: get send_seq=%d\n", session->name, *val); |
fd558d18 JC |
1331 | break; |
1332 | ||
1333 | case PPPOL2TP_SO_LNSMODE: | |
1334 | *val = session->lns_mode; | |
fba40c63 | 1335 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1336 | "%s: get lns_mode=%d\n", session->name, *val); |
fd558d18 JC |
1337 | break; |
1338 | ||
1339 | case PPPOL2TP_SO_DEBUG: | |
1340 | *val = session->debug; | |
fba40c63 | 1341 | l2tp_info(session, L2TP_MSG_CONTROL, "%s: get debug=%d\n", |
a4ca44fa | 1342 | session->name, *val); |
fd558d18 JC |
1343 | break; |
1344 | ||
1345 | case PPPOL2TP_SO_REORDERTO: | |
1346 | *val = (int) jiffies_to_msecs(session->reorder_timeout); | |
fba40c63 | 1347 | l2tp_info(session, L2TP_MSG_CONTROL, |
a4ca44fa | 1348 | "%s: get reorder_timeout=%d\n", session->name, *val); |
fd558d18 JC |
1349 | break; |
1350 | ||
1351 | default: | |
1352 | err = -ENOPROTOOPT; | |
1353 | } | |
1354 | ||
1355 | return err; | |
1356 | } | |
1357 | ||
1358 | /* Main getsockopt() entry point. | |
1359 | * Does API checks, then calls either the tunnel or session getsockopt | |
1360 | * handler, according to whether the PPPoX socket is a for a regular session | |
1361 | * or the special tunnel type. | |
1362 | */ | |
e3192690 JP |
1363 | static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, |
1364 | char __user *optval, int __user *optlen) | |
fd558d18 JC |
1365 | { |
1366 | struct sock *sk = sock->sk; | |
1367 | struct l2tp_session *session; | |
1368 | struct l2tp_tunnel *tunnel; | |
1369 | int val, len; | |
1370 | int err; | |
fd558d18 JC |
1371 | |
1372 | if (level != SOL_PPPOL2TP) | |
3cf521f7 | 1373 | return -EINVAL; |
fd558d18 | 1374 | |
e3192690 | 1375 | if (get_user(len, optlen)) |
fd558d18 JC |
1376 | return -EFAULT; |
1377 | ||
1378 | len = min_t(unsigned int, len, sizeof(int)); | |
1379 | ||
1380 | if (len < 0) | |
1381 | return -EINVAL; | |
1382 | ||
1383 | err = -ENOTCONN; | |
1384 | if (sk->sk_user_data == NULL) | |
1385 | goto end; | |
1386 | ||
1387 | /* Get the session context */ | |
1388 | err = -EBADF; | |
1389 | session = pppol2tp_sock_to_session(sk); | |
1390 | if (session == NULL) | |
1391 | goto end; | |
1392 | ||
1393 | /* Special case: if session_id == 0x0000, treat as operation on tunnel */ | |
fd558d18 JC |
1394 | if ((session->session_id == 0) && |
1395 | (session->peer_session_id == 0)) { | |
7198c77a | 1396 | tunnel = session->tunnel; |
fd558d18 | 1397 | err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); |
321a52a3 GN |
1398 | if (err) |
1399 | goto end_put_sess; | |
1400 | } else { | |
fd558d18 | 1401 | err = pppol2tp_session_getsockopt(sk, session, optname, &val); |
321a52a3 GN |
1402 | if (err) |
1403 | goto end_put_sess; | |
1404 | } | |
fd558d18 JC |
1405 | |
1406 | err = -EFAULT; | |
e3192690 | 1407 | if (put_user(len, optlen)) |
fd558d18 JC |
1408 | goto end_put_sess; |
1409 | ||
1410 | if (copy_to_user((void __user *) optval, &val, len)) | |
1411 | goto end_put_sess; | |
1412 | ||
1413 | err = 0; | |
1414 | ||
1415 | end_put_sess: | |
1416 | sock_put(sk); | |
1417 | end: | |
1418 | return err; | |
1419 | } | |
1420 | ||
1421 | /***************************************************************************** | |
1422 | * /proc filesystem for debug | |
f7faffa3 JC |
1423 | * Since the original pppol2tp driver provided /proc/net/pppol2tp for |
1424 | * L2TPv2, we dump only L2TPv2 tunnels and sessions here. | |
fd558d18 JC |
1425 | *****************************************************************************/ |
1426 | ||
1427 | static unsigned int pppol2tp_net_id; | |
1428 | ||
1429 | #ifdef CONFIG_PROC_FS | |
1430 | ||
1431 | struct pppol2tp_seq_data { | |
1432 | struct seq_net_private p; | |
1433 | int tunnel_idx; /* current tunnel */ | |
1434 | int session_idx; /* index of session within current tunnel */ | |
1435 | struct l2tp_tunnel *tunnel; | |
1436 | struct l2tp_session *session; /* NULL means get next tunnel */ | |
1437 | }; | |
1438 | ||
1439 | static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd) | |
1440 | { | |
0e0c3fee GN |
1441 | /* Drop reference taken during previous invocation */ |
1442 | if (pd->tunnel) | |
1443 | l2tp_tunnel_dec_refcount(pd->tunnel); | |
1444 | ||
f7faffa3 | 1445 | for (;;) { |
0e0c3fee | 1446 | pd->tunnel = l2tp_tunnel_get_nth(net, pd->tunnel_idx); |
f7faffa3 JC |
1447 | pd->tunnel_idx++; |
1448 | ||
0e0c3fee GN |
1449 | /* Only accept L2TPv2 tunnels */ |
1450 | if (!pd->tunnel || pd->tunnel->version == 2) | |
1451 | return; | |
f7faffa3 | 1452 | |
0e0c3fee | 1453 | l2tp_tunnel_dec_refcount(pd->tunnel); |
f7faffa3 | 1454 | } |
fd558d18 JC |
1455 | } |
1456 | ||
1457 | static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd) | |
1458 | { | |
83494407 GN |
1459 | /* Drop reference taken during previous invocation */ |
1460 | if (pd->session) | |
1461 | l2tp_session_dec_refcount(pd->session); | |
1462 | ||
a4346210 | 1463 | pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx); |
fd558d18 | 1464 | pd->session_idx++; |
f7faffa3 | 1465 | |
fd558d18 JC |
1466 | if (pd->session == NULL) { |
1467 | pd->session_idx = 0; | |
1468 | pppol2tp_next_tunnel(net, pd); | |
1469 | } | |
1470 | } | |
1471 | ||
1472 | static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs) | |
1473 | { | |
1474 | struct pppol2tp_seq_data *pd = SEQ_START_TOKEN; | |
1475 | loff_t pos = *offs; | |
1476 | struct net *net; | |
1477 | ||
1478 | if (!pos) | |
1479 | goto out; | |
1480 | ||
1481 | BUG_ON(m->private == NULL); | |
1482 | pd = m->private; | |
1483 | net = seq_file_net(m); | |
1484 | ||
1485 | if (pd->tunnel == NULL) | |
1486 | pppol2tp_next_tunnel(net, pd); | |
1487 | else | |
1488 | pppol2tp_next_session(net, pd); | |
1489 | ||
1490 | /* NULL tunnel and session indicates end of list */ | |
1491 | if ((pd->tunnel == NULL) && (pd->session == NULL)) | |
1492 | pd = NULL; | |
1493 | ||
1494 | out: | |
1495 | return pd; | |
1496 | } | |
1497 | ||
1498 | static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1499 | { | |
1500 | (*pos)++; | |
1501 | return NULL; | |
1502 | } | |
1503 | ||
1504 | static void pppol2tp_seq_stop(struct seq_file *p, void *v) | |
1505 | { | |
0e0c3fee GN |
1506 | struct pppol2tp_seq_data *pd = v; |
1507 | ||
1508 | if (!pd || pd == SEQ_START_TOKEN) | |
1509 | return; | |
1510 | ||
83494407 GN |
1511 | /* Drop reference taken by last invocation of pppol2tp_next_session() |
1512 | * or pppol2tp_next_tunnel(). | |
1513 | */ | |
1514 | if (pd->session) { | |
1515 | l2tp_session_dec_refcount(pd->session); | |
1516 | pd->session = NULL; | |
1517 | } | |
5411b618 | 1518 | if (pd->tunnel) { |
0e0c3fee | 1519 | l2tp_tunnel_dec_refcount(pd->tunnel); |
5411b618 | 1520 | pd->tunnel = NULL; |
5411b618 | 1521 | } |
fd558d18 JC |
1522 | } |
1523 | ||
1524 | static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v) | |
1525 | { | |
1526 | struct l2tp_tunnel *tunnel = v; | |
1527 | ||
1528 | seq_printf(m, "\nTUNNEL '%s', %c %d\n", | |
1529 | tunnel->name, | |
1530 | (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N', | |
fbea9e07 | 1531 | refcount_read(&tunnel->ref_count) - 1); |
7b7c0719 | 1532 | seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n", |
fd558d18 | 1533 | tunnel->debug, |
7b7c0719 TP |
1534 | atomic_long_read(&tunnel->stats.tx_packets), |
1535 | atomic_long_read(&tunnel->stats.tx_bytes), | |
1536 | atomic_long_read(&tunnel->stats.tx_errors), | |
1537 | atomic_long_read(&tunnel->stats.rx_packets), | |
1538 | atomic_long_read(&tunnel->stats.rx_bytes), | |
1539 | atomic_long_read(&tunnel->stats.rx_errors)); | |
fd558d18 JC |
1540 | } |
1541 | ||
1542 | static void pppol2tp_seq_session_show(struct seq_file *m, void *v) | |
1543 | { | |
1544 | struct l2tp_session *session = v; | |
1545 | struct l2tp_tunnel *tunnel = session->tunnel; | |
ee40fb2e GN |
1546 | unsigned char state; |
1547 | char user_data_ok; | |
1548 | struct sock *sk; | |
fd558d18 JC |
1549 | u32 ip = 0; |
1550 | u16 port = 0; | |
1551 | ||
1552 | if (tunnel->sock) { | |
1553 | struct inet_sock *inet = inet_sk(tunnel->sock); | |
1554 | ip = ntohl(inet->inet_saddr); | |
1555 | port = ntohs(inet->inet_sport); | |
1556 | } | |
1557 | ||
ee40fb2e GN |
1558 | sk = pppol2tp_session_get_sock(session); |
1559 | if (sk) { | |
1560 | state = sk->sk_state; | |
1561 | user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N'; | |
1562 | } else { | |
1563 | state = 0; | |
1564 | user_data_ok = 'N'; | |
1565 | } | |
1566 | ||
fd558d18 JC |
1567 | seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> " |
1568 | "%04X/%04X %d %c\n", | |
1569 | session->name, ip, port, | |
1570 | tunnel->tunnel_id, | |
1571 | session->session_id, | |
1572 | tunnel->peer_tunnel_id, | |
1573 | session->peer_session_id, | |
ee40fb2e | 1574 | state, user_data_ok); |
789141b2 | 1575 | seq_printf(m, " 0/0/%c/%c/%s %08x %u\n", |
fd558d18 JC |
1576 | session->recv_seq ? 'R' : '-', |
1577 | session->send_seq ? 'S' : '-', | |
1578 | session->lns_mode ? "LNS" : "LAC", | |
1579 | session->debug, | |
1580 | jiffies_to_msecs(session->reorder_timeout)); | |
7b7c0719 | 1581 | seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n", |
fd558d18 | 1582 | session->nr, session->ns, |
7b7c0719 TP |
1583 | atomic_long_read(&session->stats.tx_packets), |
1584 | atomic_long_read(&session->stats.tx_bytes), | |
1585 | atomic_long_read(&session->stats.tx_errors), | |
1586 | atomic_long_read(&session->stats.rx_packets), | |
1587 | atomic_long_read(&session->stats.rx_bytes), | |
1588 | atomic_long_read(&session->stats.rx_errors)); | |
9345471b | 1589 | |
ee40fb2e GN |
1590 | if (sk) { |
1591 | struct pppox_sock *po = pppox_sk(sk); | |
1592 | ||
9345471b | 1593 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); |
ee40fb2e GN |
1594 | sock_put(sk); |
1595 | } | |
fd558d18 JC |
1596 | } |
1597 | ||
1598 | static int pppol2tp_seq_show(struct seq_file *m, void *v) | |
1599 | { | |
1600 | struct pppol2tp_seq_data *pd = v; | |
1601 | ||
1602 | /* display header on line 1 */ | |
1603 | if (v == SEQ_START_TOKEN) { | |
1604 | seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n"); | |
1605 | seq_puts(m, "TUNNEL name, user-data-ok session-count\n"); | |
1606 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1607 | seq_puts(m, " SESSION name, addr/port src-tid/sid " | |
1608 | "dest-tid/sid state user-data-ok\n"); | |
1609 | seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n"); | |
1610 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1611 | goto out; | |
1612 | } | |
1613 | ||
83494407 | 1614 | if (!pd->session) |
fd558d18 | 1615 | pppol2tp_seq_tunnel_show(m, pd->tunnel); |
83494407 | 1616 | else |
fd558d18 JC |
1617 | pppol2tp_seq_session_show(m, pd->session); |
1618 | ||
1619 | out: | |
1620 | return 0; | |
1621 | } | |
1622 | ||
1623 | static const struct seq_operations pppol2tp_seq_ops = { | |
1624 | .start = pppol2tp_seq_start, | |
1625 | .next = pppol2tp_seq_next, | |
1626 | .stop = pppol2tp_seq_stop, | |
1627 | .show = pppol2tp_seq_show, | |
1628 | }; | |
fd558d18 JC |
1629 | #endif /* CONFIG_PROC_FS */ |
1630 | ||
1631 | /***************************************************************************** | |
1632 | * Network namespace | |
1633 | *****************************************************************************/ | |
1634 | ||
1635 | static __net_init int pppol2tp_init_net(struct net *net) | |
1636 | { | |
1637 | struct proc_dir_entry *pde; | |
1638 | int err = 0; | |
1639 | ||
c3506372 CH |
1640 | pde = proc_create_net("pppol2tp", 0444, net->proc_net, |
1641 | &pppol2tp_seq_ops, sizeof(struct pppol2tp_seq_data)); | |
fd558d18 JC |
1642 | if (!pde) { |
1643 | err = -ENOMEM; | |
1644 | goto out; | |
1645 | } | |
1646 | ||
1647 | out: | |
1648 | return err; | |
1649 | } | |
1650 | ||
1651 | static __net_exit void pppol2tp_exit_net(struct net *net) | |
1652 | { | |
ece31ffd | 1653 | remove_proc_entry("pppol2tp", net->proc_net); |
fd558d18 JC |
1654 | } |
1655 | ||
1656 | static struct pernet_operations pppol2tp_net_ops = { | |
1657 | .init = pppol2tp_init_net, | |
1658 | .exit = pppol2tp_exit_net, | |
1659 | .id = &pppol2tp_net_id, | |
1660 | }; | |
1661 | ||
1662 | /***************************************************************************** | |
1663 | * Init and cleanup | |
1664 | *****************************************************************************/ | |
1665 | ||
1666 | static const struct proto_ops pppol2tp_ops = { | |
1667 | .family = AF_PPPOX, | |
1668 | .owner = THIS_MODULE, | |
1669 | .release = pppol2tp_release, | |
1670 | .bind = sock_no_bind, | |
1671 | .connect = pppol2tp_connect, | |
1672 | .socketpair = sock_no_socketpair, | |
1673 | .accept = sock_no_accept, | |
1674 | .getname = pppol2tp_getname, | |
a11e1d43 | 1675 | .poll = datagram_poll, |
fd558d18 JC |
1676 | .listen = sock_no_listen, |
1677 | .shutdown = sock_no_shutdown, | |
1678 | .setsockopt = pppol2tp_setsockopt, | |
1679 | .getsockopt = pppol2tp_getsockopt, | |
1680 | .sendmsg = pppol2tp_sendmsg, | |
1681 | .recvmsg = pppol2tp_recvmsg, | |
1682 | .mmap = sock_no_mmap, | |
1683 | .ioctl = pppox_ioctl, | |
1684 | }; | |
1685 | ||
756e64a0 | 1686 | static const struct pppox_proto pppol2tp_proto = { |
fd558d18 | 1687 | .create = pppol2tp_create, |
e1558a93 WY |
1688 | .ioctl = pppol2tp_ioctl, |
1689 | .owner = THIS_MODULE, | |
fd558d18 JC |
1690 | }; |
1691 | ||
309795f4 JC |
1692 | #ifdef CONFIG_L2TP_V3 |
1693 | ||
1694 | static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = { | |
1695 | .session_create = pppol2tp_session_create, | |
cf2f5c88 | 1696 | .session_delete = l2tp_session_delete, |
309795f4 JC |
1697 | }; |
1698 | ||
1699 | #endif /* CONFIG_L2TP_V3 */ | |
1700 | ||
fd558d18 JC |
1701 | static int __init pppol2tp_init(void) |
1702 | { | |
1703 | int err; | |
1704 | ||
1705 | err = register_pernet_device(&pppol2tp_net_ops); | |
1706 | if (err) | |
1707 | goto out; | |
1708 | ||
1709 | err = proto_register(&pppol2tp_sk_proto, 0); | |
1710 | if (err) | |
1711 | goto out_unregister_pppol2tp_pernet; | |
1712 | ||
1713 | err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto); | |
1714 | if (err) | |
1715 | goto out_unregister_pppol2tp_proto; | |
1716 | ||
309795f4 JC |
1717 | #ifdef CONFIG_L2TP_V3 |
1718 | err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops); | |
1719 | if (err) | |
1720 | goto out_unregister_pppox; | |
1721 | #endif | |
1722 | ||
a4ca44fa | 1723 | pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION); |
fd558d18 JC |
1724 | |
1725 | out: | |
1726 | return err; | |
309795f4 JC |
1727 | |
1728 | #ifdef CONFIG_L2TP_V3 | |
1729 | out_unregister_pppox: | |
1730 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
1731 | #endif | |
fd558d18 JC |
1732 | out_unregister_pppol2tp_proto: |
1733 | proto_unregister(&pppol2tp_sk_proto); | |
1734 | out_unregister_pppol2tp_pernet: | |
1735 | unregister_pernet_device(&pppol2tp_net_ops); | |
1736 | goto out; | |
1737 | } | |
1738 | ||
1739 | static void __exit pppol2tp_exit(void) | |
1740 | { | |
309795f4 JC |
1741 | #ifdef CONFIG_L2TP_V3 |
1742 | l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP); | |
1743 | #endif | |
fd558d18 JC |
1744 | unregister_pppox_proto(PX_PROTO_OL2TP); |
1745 | proto_unregister(&pppol2tp_sk_proto); | |
1746 | unregister_pernet_device(&pppol2tp_net_ops); | |
1747 | } | |
1748 | ||
1749 | module_init(pppol2tp_init); | |
1750 | module_exit(pppol2tp_exit); | |
1751 | ||
1752 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
1753 | MODULE_DESCRIPTION("PPP over L2TP over UDP"); | |
1754 | MODULE_LICENSE("GPL"); | |
1755 | MODULE_VERSION(PPPOL2TP_DRV_VERSION); | |
681b4d88 | 1756 | MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP); |
249ee819 | 1757 | MODULE_ALIAS_L2TP_PWTYPE(7); |