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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 | 119 | struct mutex sk_lock; /* Protects .sk */ |
20dcb110 | 120 | struct sock __rcu *sk; /* Pointer to the session PPPoX socket */ |
ee40fb2e GN |
121 | struct sock *__sk; /* Copy of .sk, for cleanup */ |
122 | struct rcu_head rcu; /* For asynchronous release */ | |
fd558d18 JC |
123 | }; |
124 | ||
125 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
126 | ||
d7100da0 | 127 | static const struct ppp_channel_ops pppol2tp_chan_ops = { |
128 | .start_xmit = pppol2tp_xmit, | |
129 | }; | |
130 | ||
fd558d18 JC |
131 | static const struct proto_ops pppol2tp_ops; |
132 | ||
ee40fb2e GN |
133 | /* Retrieves the pppol2tp socket associated to a session. |
134 | * A reference is held on the returned socket, so this function must be paired | |
135 | * with sock_put(). | |
136 | */ | |
137 | static struct sock *pppol2tp_session_get_sock(struct l2tp_session *session) | |
138 | { | |
139 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
140 | struct sock *sk; | |
141 | ||
142 | rcu_read_lock(); | |
143 | sk = rcu_dereference(ps->sk); | |
144 | if (sk) | |
145 | sock_hold(sk); | |
146 | rcu_read_unlock(); | |
147 | ||
148 | return sk; | |
149 | } | |
150 | ||
fd558d18 JC |
151 | /* Helpers to obtain tunnel/session contexts from sockets. |
152 | */ | |
153 | static inline struct l2tp_session *pppol2tp_sock_to_session(struct sock *sk) | |
154 | { | |
155 | struct l2tp_session *session; | |
156 | ||
0febc7b3 | 157 | if (!sk) |
fd558d18 JC |
158 | return NULL; |
159 | ||
160 | sock_hold(sk); | |
161 | session = (struct l2tp_session *)(sk->sk_user_data); | |
0febc7b3 | 162 | if (!session) { |
fd558d18 JC |
163 | sock_put(sk); |
164 | goto out; | |
165 | } | |
1aa646ac TP |
166 | if (WARN_ON(session->magic != L2TP_SESSION_MAGIC)) { |
167 | session = NULL; | |
168 | sock_put(sk); | |
169 | goto out; | |
170 | } | |
fd558d18 JC |
171 | |
172 | out: | |
173 | return session; | |
174 | } | |
175 | ||
176 | /***************************************************************************** | |
177 | * Receive data handling | |
178 | *****************************************************************************/ | |
179 | ||
fd558d18 JC |
180 | /* Receive message. This is the recvmsg for the PPPoL2TP socket. |
181 | */ | |
1b784140 YX |
182 | static int pppol2tp_recvmsg(struct socket *sock, struct msghdr *msg, |
183 | size_t len, int flags) | |
fd558d18 JC |
184 | { |
185 | int err; | |
186 | struct sk_buff *skb; | |
187 | struct sock *sk = sock->sk; | |
188 | ||
189 | err = -EIO; | |
190 | if (sk->sk_state & PPPOX_BOUND) | |
191 | goto end; | |
192 | ||
fd558d18 | 193 | err = 0; |
f4b41f06 | 194 | skb = skb_recv_datagram(sk, flags, &err); |
fd558d18 JC |
195 | if (!skb) |
196 | goto end; | |
197 | ||
198 | if (len > skb->len) | |
199 | len = skb->len; | |
200 | else if (len < skb->len) | |
201 | msg->msg_flags |= MSG_TRUNC; | |
202 | ||
51f3d02b | 203 | err = skb_copy_datagram_msg(skb, 0, msg, len); |
fd558d18 JC |
204 | if (likely(err == 0)) |
205 | err = len; | |
206 | ||
207 | kfree_skb(skb); | |
208 | end: | |
209 | return err; | |
210 | } | |
211 | ||
212 | static void pppol2tp_recv(struct l2tp_session *session, struct sk_buff *skb, int data_len) | |
213 | { | |
214 | struct pppol2tp_session *ps = l2tp_session_priv(session); | |
215 | struct sock *sk = NULL; | |
216 | ||
217 | /* If the socket is bound, send it in to PPP's input queue. Otherwise | |
218 | * queue it on the session socket. | |
219 | */ | |
ee40fb2e GN |
220 | rcu_read_lock(); |
221 | sk = rcu_dereference(ps->sk); | |
0febc7b3 | 222 | if (!sk) |
fd558d18 JC |
223 | goto no_sock; |
224 | ||
2b139e6b GN |
225 | /* If the first two bytes are 0xFF03, consider that it is the PPP's |
226 | * Address and Control fields and skip them. The L2TP module has always | |
227 | * worked this way, although, in theory, the use of these fields should | |
7f553ff2 | 228 | * be negotiated and handled at the PPP layer. These fields are |
2b139e6b GN |
229 | * constant: 0xFF is the All-Stations Address and 0x03 the Unnumbered |
230 | * Information command with Poll/Final bit set to zero (RFC 1662). | |
231 | */ | |
232 | if (pskb_may_pull(skb, 2) && skb->data[0] == PPP_ALLSTATIONS && | |
233 | skb->data[1] == PPP_UI) | |
234 | skb_pull(skb, 2); | |
235 | ||
fd558d18 JC |
236 | if (sk->sk_state & PPPOX_BOUND) { |
237 | struct pppox_sock *po; | |
98f40b3e | 238 | |
fd558d18 JC |
239 | po = pppox_sk(sk); |
240 | ppp_input(&po->chan, skb); | |
241 | } else { | |
9e9cb622 GN |
242 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
243 | atomic_long_inc(&session->stats.rx_errors); | |
244 | kfree_skb(skb); | |
245 | } | |
fd558d18 | 246 | } |
ee40fb2e | 247 | rcu_read_unlock(); |
fd558d18 JC |
248 | |
249 | return; | |
250 | ||
251 | no_sock: | |
ee40fb2e | 252 | rcu_read_unlock(); |
5ee759cd | 253 | pr_warn_ratelimited("%s: no socket in recv\n", session->name); |
fd558d18 JC |
254 | kfree_skb(skb); |
255 | } | |
256 | ||
fd558d18 JC |
257 | /************************************************************************ |
258 | * Transmit handling | |
259 | ***********************************************************************/ | |
260 | ||
fd558d18 JC |
261 | /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here |
262 | * when a user application does a sendmsg() on the session socket. L2TP and | |
263 | * PPP headers must be inserted into the user's data. | |
264 | */ | |
1b784140 | 265 | static int pppol2tp_sendmsg(struct socket *sock, struct msghdr *m, |
fd558d18 JC |
266 | size_t total_len) |
267 | { | |
fd558d18 JC |
268 | struct sock *sk = sock->sk; |
269 | struct sk_buff *skb; | |
270 | int error; | |
271 | struct l2tp_session *session; | |
272 | struct l2tp_tunnel *tunnel; | |
0d76751f | 273 | int uhlen; |
fd558d18 JC |
274 | |
275 | error = -ENOTCONN; | |
276 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
277 | goto error; | |
278 | ||
279 | /* Get session and tunnel contexts */ | |
280 | error = -EBADF; | |
281 | session = pppol2tp_sock_to_session(sk); | |
0febc7b3 | 282 | if (!session) |
fd558d18 JC |
283 | goto error; |
284 | ||
7198c77a | 285 | tunnel = session->tunnel; |
fd558d18 | 286 | |
0d76751f JC |
287 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
288 | ||
fd558d18 JC |
289 | /* Allocate a socket buffer */ |
290 | error = -ENOMEM; | |
291 | skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + | |
0d76751f | 292 | uhlen + session->hdr_len + |
54c151d9 | 293 | 2 + total_len, /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ |
fd558d18 JC |
294 | 0, GFP_KERNEL); |
295 | if (!skb) | |
7198c77a | 296 | goto error_put_sess; |
fd558d18 JC |
297 | |
298 | /* Reserve space for headers. */ | |
299 | skb_reserve(skb, NET_SKB_PAD); | |
300 | skb_reset_network_header(skb); | |
301 | skb_reserve(skb, sizeof(struct iphdr)); | |
302 | skb_reset_transport_header(skb); | |
0d76751f | 303 | skb_reserve(skb, uhlen); |
fd558d18 JC |
304 | |
305 | /* Add PPP header */ | |
54c151d9 GF |
306 | skb->data[0] = PPP_ALLSTATIONS; |
307 | skb->data[1] = PPP_UI; | |
fd558d18 JC |
308 | skb_put(skb, 2); |
309 | ||
310 | /* Copy user data into skb */ | |
6ce8e9ce | 311 | error = memcpy_from_msg(skb_put(skb, total_len), m, total_len); |
fd558d18 JC |
312 | if (error < 0) { |
313 | kfree_skb(skb); | |
7198c77a | 314 | goto error_put_sess; |
fd558d18 | 315 | } |
fd558d18 | 316 | |
455cc32b | 317 | local_bh_disable(); |
efe05278 | 318 | l2tp_xmit_skb(session, skb); |
455cc32b | 319 | local_bh_enable(); |
fd558d18 | 320 | |
8b82547e | 321 | sock_put(sk); |
fd558d18 | 322 | |
a6f79d0f | 323 | return total_len; |
fd558d18 | 324 | |
fd558d18 JC |
325 | error_put_sess: |
326 | sock_put(sk); | |
327 | error: | |
328 | return error; | |
329 | } | |
330 | ||
331 | /* Transmit function called by generic PPP driver. Sends PPP frame | |
332 | * over PPPoL2TP socket. | |
333 | * | |
334 | * This is almost the same as pppol2tp_sendmsg(), but rather than | |
335 | * being called with a msghdr from userspace, it is called with a skb | |
336 | * from the kernel. | |
337 | * | |
338 | * The supplied skb from ppp doesn't have enough headroom for the | |
339 | * insertion of L2TP, UDP and IP headers so we need to allocate more | |
340 | * headroom in the skb. This will create a cloned skb. But we must be | |
341 | * careful in the error case because the caller will expect to free | |
342 | * the skb it supplied, not our cloned skb. So we take care to always | |
343 | * leave the original skb unfreed if we return an error. | |
344 | */ | |
345 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
346 | { | |
b71a61cc | 347 | struct sock *sk = (struct sock *)chan->private; |
fd558d18 JC |
348 | struct l2tp_session *session; |
349 | struct l2tp_tunnel *tunnel; | |
09df57ca | 350 | int uhlen, headroom; |
fd558d18 JC |
351 | |
352 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
353 | goto abort; | |
354 | ||
355 | /* Get session and tunnel contexts from the socket */ | |
356 | session = pppol2tp_sock_to_session(sk); | |
0febc7b3 | 357 | if (!session) |
fd558d18 JC |
358 | goto abort; |
359 | ||
7198c77a | 360 | tunnel = session->tunnel; |
fd558d18 | 361 | |
09df57ca ED |
362 | uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; |
363 | headroom = NET_SKB_PAD + | |
364 | sizeof(struct iphdr) + /* IP header */ | |
365 | uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */ | |
366 | session->hdr_len + /* L2TP header */ | |
54c151d9 | 367 | 2; /* 2 bytes for PPP_ALLSTATIONS & PPP_UI */ |
09df57ca | 368 | if (skb_cow_head(skb, headroom)) |
7198c77a | 369 | goto abort_put_sess; |
fd558d18 | 370 | |
fd558d18 | 371 | /* Setup PPP header */ |
54c151d9 GF |
372 | __skb_push(skb, 2); |
373 | skb->data[0] = PPP_ALLSTATIONS; | |
374 | skb->data[1] = PPP_UI; | |
fd558d18 | 375 | |
455cc32b | 376 | local_bh_disable(); |
efe05278 | 377 | l2tp_xmit_skb(session, skb); |
455cc32b | 378 | local_bh_enable(); |
fd558d18 | 379 | |
fd558d18 | 380 | sock_put(sk); |
7198c77a | 381 | |
fd558d18 JC |
382 | return 1; |
383 | ||
fd558d18 JC |
384 | abort_put_sess: |
385 | sock_put(sk); | |
386 | abort: | |
387 | /* Free the original skb */ | |
388 | kfree_skb(skb); | |
389 | return 1; | |
390 | } | |
391 | ||
392 | /***************************************************************************** | |
393 | * Session (and tunnel control) socket create/destroy. | |
394 | *****************************************************************************/ | |
395 | ||
d02ba2a6 JC |
396 | static void pppol2tp_put_sk(struct rcu_head *head) |
397 | { | |
398 | struct pppol2tp_session *ps; | |
399 | ||
400 | ps = container_of(head, typeof(*ps), rcu); | |
401 | sock_put(ps->__sk); | |
402 | } | |
403 | ||
fd558d18 JC |
404 | /* Really kill the session socket. (Called from sock_put() if |
405 | * refcnt == 0.) | |
406 | */ | |
407 | static void pppol2tp_session_destruct(struct sock *sk) | |
408 | { | |
f6e16b29 | 409 | struct l2tp_session *session = sk->sk_user_data; |
e91793bb GN |
410 | |
411 | skb_queue_purge(&sk->sk_receive_queue); | |
412 | skb_queue_purge(&sk->sk_write_queue); | |
413 | ||
f6e16b29 | 414 | if (session) { |
fd558d18 | 415 | sk->sk_user_data = NULL; |
1aa646ac TP |
416 | if (WARN_ON(session->magic != L2TP_SESSION_MAGIC)) |
417 | return; | |
fd558d18 JC |
418 | l2tp_session_dec_refcount(session); |
419 | } | |
fd558d18 JC |
420 | } |
421 | ||
422 | /* Called when the PPPoX socket (session) is closed. | |
423 | */ | |
424 | static int pppol2tp_release(struct socket *sock) | |
425 | { | |
426 | struct sock *sk = sock->sk; | |
427 | struct l2tp_session *session; | |
428 | int error; | |
429 | ||
430 | if (!sk) | |
431 | return 0; | |
432 | ||
433 | error = -EBADF; | |
434 | lock_sock(sk); | |
435 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
436 | goto error; | |
437 | ||
438 | pppox_unbind_sock(sk); | |
439 | ||
440 | /* Signal the death of the socket. */ | |
441 | sk->sk_state = PPPOX_DEAD; | |
442 | sock_orphan(sk); | |
443 | sock->sk = NULL; | |
444 | ||
445 | session = pppol2tp_sock_to_session(sk); | |
d02ba2a6 | 446 | if (session) { |
3d609342 GN |
447 | struct pppol2tp_session *ps; |
448 | ||
f98be6c6 | 449 | l2tp_session_delete(session); |
3d609342 GN |
450 | |
451 | ps = l2tp_session_priv(session); | |
452 | mutex_lock(&ps->sk_lock); | |
453 | ps->__sk = rcu_dereference_protected(ps->sk, | |
454 | lockdep_is_held(&ps->sk_lock)); | |
455 | RCU_INIT_POINTER(ps->sk, NULL); | |
456 | mutex_unlock(&ps->sk_lock); | |
457 | call_rcu(&ps->rcu, pppol2tp_put_sk); | |
458 | ||
459 | /* Rely on the sock_put() call at the end of the function for | |
460 | * dropping the reference held by pppol2tp_sock_to_session(). | |
461 | * The last reference will be dropped by pppol2tp_put_sk(). | |
462 | */ | |
fd558d18 | 463 | } |
d02ba2a6 | 464 | |
fd558d18 JC |
465 | release_sock(sk); |
466 | ||
467 | /* This will delete the session context via | |
468 | * pppol2tp_session_destruct() if the socket's refcnt drops to | |
469 | * zero. | |
470 | */ | |
471 | sock_put(sk); | |
472 | ||
473 | return 0; | |
474 | ||
475 | error: | |
476 | release_sock(sk); | |
477 | return error; | |
478 | } | |
479 | ||
480 | static struct proto pppol2tp_sk_proto = { | |
481 | .name = "PPPOL2TP", | |
482 | .owner = THIS_MODULE, | |
483 | .obj_size = sizeof(struct pppox_sock), | |
484 | }; | |
485 | ||
486 | static int pppol2tp_backlog_recv(struct sock *sk, struct sk_buff *skb) | |
487 | { | |
488 | int rc; | |
489 | ||
490 | rc = l2tp_udp_encap_recv(sk, skb); | |
491 | if (rc) | |
492 | kfree_skb(skb); | |
493 | ||
494 | return NET_RX_SUCCESS; | |
495 | } | |
496 | ||
497 | /* socket() handler. Initialize a new struct sock. | |
498 | */ | |
11aa9c28 | 499 | static int pppol2tp_create(struct net *net, struct socket *sock, int kern) |
fd558d18 JC |
500 | { |
501 | int error = -ENOMEM; | |
502 | struct sock *sk; | |
503 | ||
11aa9c28 | 504 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto, kern); |
fd558d18 JC |
505 | if (!sk) |
506 | goto out; | |
507 | ||
508 | sock_init_data(sock, sk); | |
509 | ||
510 | sock->state = SS_UNCONNECTED; | |
511 | sock->ops = &pppol2tp_ops; | |
512 | ||
513 | sk->sk_backlog_rcv = pppol2tp_backlog_recv; | |
514 | sk->sk_protocol = PX_PROTO_OL2TP; | |
515 | sk->sk_family = PF_PPPOX; | |
516 | sk->sk_state = PPPOX_NONE; | |
517 | sk->sk_type = SOCK_STREAM; | |
518 | sk->sk_destruct = pppol2tp_session_destruct; | |
519 | ||
520 | error = 0; | |
521 | ||
522 | out: | |
523 | return error; | |
524 | } | |
525 | ||
0ad66140 JC |
526 | static void pppol2tp_show(struct seq_file *m, void *arg) |
527 | { | |
528 | struct l2tp_session *session = arg; | |
ee40fb2e GN |
529 | struct sock *sk; |
530 | ||
531 | sk = pppol2tp_session_get_sock(session); | |
532 | if (sk) { | |
533 | struct pppox_sock *po = pppox_sk(sk); | |
0ad66140 | 534 | |
ee40fb2e GN |
535 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); |
536 | sock_put(sk); | |
0ad66140 JC |
537 | } |
538 | } | |
0ad66140 | 539 | |
f98be6c6 GN |
540 | static void pppol2tp_session_init(struct l2tp_session *session) |
541 | { | |
542 | struct pppol2tp_session *ps; | |
f98be6c6 GN |
543 | |
544 | session->recv_skb = pppol2tp_recv; | |
c2ebc256 AB |
545 | if (IS_ENABLED(CONFIG_L2TP_DEBUGFS)) |
546 | session->show = pppol2tp_show; | |
f98be6c6 GN |
547 | |
548 | ps = l2tp_session_priv(session); | |
549 | mutex_init(&ps->sk_lock); | |
f98be6c6 | 550 | ps->owner = current->pid; |
f98be6c6 GN |
551 | } |
552 | ||
a408194a GN |
553 | struct l2tp_connect_info { |
554 | u8 version; | |
555 | int fd; | |
556 | u32 tunnel_id; | |
557 | u32 peer_tunnel_id; | |
558 | u32 session_id; | |
559 | u32 peer_session_id; | |
560 | }; | |
561 | ||
562 | static int pppol2tp_sockaddr_get_info(const void *sa, int sa_len, | |
563 | struct l2tp_connect_info *info) | |
564 | { | |
565 | switch (sa_len) { | |
566 | case sizeof(struct sockaddr_pppol2tp): | |
567 | { | |
568 | const struct sockaddr_pppol2tp *sa_v2in4 = sa; | |
569 | ||
570 | if (sa_v2in4->sa_protocol != PX_PROTO_OL2TP) | |
571 | return -EINVAL; | |
572 | ||
573 | info->version = 2; | |
574 | info->fd = sa_v2in4->pppol2tp.fd; | |
575 | info->tunnel_id = sa_v2in4->pppol2tp.s_tunnel; | |
576 | info->peer_tunnel_id = sa_v2in4->pppol2tp.d_tunnel; | |
577 | info->session_id = sa_v2in4->pppol2tp.s_session; | |
578 | info->peer_session_id = sa_v2in4->pppol2tp.d_session; | |
579 | ||
580 | break; | |
581 | } | |
582 | case sizeof(struct sockaddr_pppol2tpv3): | |
583 | { | |
584 | const struct sockaddr_pppol2tpv3 *sa_v3in4 = sa; | |
585 | ||
586 | if (sa_v3in4->sa_protocol != PX_PROTO_OL2TP) | |
587 | return -EINVAL; | |
588 | ||
589 | info->version = 3; | |
590 | info->fd = sa_v3in4->pppol2tp.fd; | |
591 | info->tunnel_id = sa_v3in4->pppol2tp.s_tunnel; | |
592 | info->peer_tunnel_id = sa_v3in4->pppol2tp.d_tunnel; | |
593 | info->session_id = sa_v3in4->pppol2tp.s_session; | |
594 | info->peer_session_id = sa_v3in4->pppol2tp.d_session; | |
595 | ||
596 | break; | |
597 | } | |
598 | case sizeof(struct sockaddr_pppol2tpin6): | |
599 | { | |
600 | const struct sockaddr_pppol2tpin6 *sa_v2in6 = sa; | |
601 | ||
602 | if (sa_v2in6->sa_protocol != PX_PROTO_OL2TP) | |
603 | return -EINVAL; | |
604 | ||
605 | info->version = 2; | |
606 | info->fd = sa_v2in6->pppol2tp.fd; | |
607 | info->tunnel_id = sa_v2in6->pppol2tp.s_tunnel; | |
608 | info->peer_tunnel_id = sa_v2in6->pppol2tp.d_tunnel; | |
609 | info->session_id = sa_v2in6->pppol2tp.s_session; | |
610 | info->peer_session_id = sa_v2in6->pppol2tp.d_session; | |
611 | ||
612 | break; | |
613 | } | |
614 | case sizeof(struct sockaddr_pppol2tpv3in6): | |
615 | { | |
616 | const struct sockaddr_pppol2tpv3in6 *sa_v3in6 = sa; | |
617 | ||
618 | if (sa_v3in6->sa_protocol != PX_PROTO_OL2TP) | |
619 | return -EINVAL; | |
620 | ||
621 | info->version = 3; | |
622 | info->fd = sa_v3in6->pppol2tp.fd; | |
623 | info->tunnel_id = sa_v3in6->pppol2tp.s_tunnel; | |
624 | info->peer_tunnel_id = sa_v3in6->pppol2tp.d_tunnel; | |
625 | info->session_id = sa_v3in6->pppol2tp.s_session; | |
626 | info->peer_session_id = sa_v3in6->pppol2tp.d_session; | |
627 | ||
628 | break; | |
629 | } | |
630 | default: | |
631 | return -EINVAL; | |
632 | } | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
789141b2 GN |
637 | /* Rough estimation of the maximum payload size a tunnel can transmit without |
638 | * fragmenting at the lower IP layer. Assumes L2TPv2 with sequence | |
639 | * numbers and no IP option. Not quite accurate, but the result is mostly | |
640 | * unused anyway. | |
641 | */ | |
642 | static int pppol2tp_tunnel_mtu(const struct l2tp_tunnel *tunnel) | |
643 | { | |
644 | int mtu; | |
645 | ||
646 | mtu = l2tp_tunnel_dst_mtu(tunnel); | |
647 | if (mtu <= PPPOL2TP_HEADER_OVERHEAD) | |
648 | return 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
649 | ||
650 | return mtu - PPPOL2TP_HEADER_OVERHEAD; | |
651 | } | |
652 | ||
fd558d18 JC |
653 | /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket |
654 | */ | |
655 | static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
656 | int sockaddr_len, int flags) | |
657 | { | |
658 | struct sock *sk = sock->sk; | |
fd558d18 JC |
659 | struct pppox_sock *po = pppox_sk(sk); |
660 | struct l2tp_session *session = NULL; | |
a408194a | 661 | struct l2tp_connect_info info; |
fd558d18 JC |
662 | struct l2tp_tunnel *tunnel; |
663 | struct pppol2tp_session *ps; | |
fd558d18 | 664 | struct l2tp_session_cfg cfg = { 0, }; |
dbdbc73b | 665 | bool drop_refcnt = false; |
f9e56baf | 666 | bool drop_tunnel = false; |
bda06be2 GN |
667 | bool new_session = false; |
668 | bool new_tunnel = false; | |
a408194a | 669 | int error; |
eb1c28c0 | 670 | |
a408194a GN |
671 | error = pppol2tp_sockaddr_get_info(uservaddr, sockaddr_len, &info); |
672 | if (error < 0) | |
673 | return error; | |
eb1c28c0 | 674 | |
a408194a | 675 | lock_sock(sk); |
fd558d18 JC |
676 | |
677 | /* Check for already bound sockets */ | |
678 | error = -EBUSY; | |
679 | if (sk->sk_state & PPPOX_CONNECTED) | |
680 | goto end; | |
681 | ||
682 | /* We don't supporting rebinding anyway */ | |
683 | error = -EALREADY; | |
684 | if (sk->sk_user_data) | |
685 | goto end; /* socket is already attached */ | |
686 | ||
e0d4435f | 687 | /* Don't bind if tunnel_id is 0 */ |
fd558d18 | 688 | error = -EINVAL; |
a408194a | 689 | if (!info.tunnel_id) |
fd558d18 JC |
690 | goto end; |
691 | ||
a408194a | 692 | tunnel = l2tp_tunnel_get(sock_net(sk), info.tunnel_id); |
f9e56baf GN |
693 | if (tunnel) |
694 | drop_tunnel = true; | |
309795f4 | 695 | |
e0d4435f JC |
696 | /* Special case: create tunnel context if session_id and |
697 | * peer_session_id is 0. Otherwise look up tunnel using supplied | |
fd558d18 JC |
698 | * tunnel id. |
699 | */ | |
a408194a | 700 | if (!info.session_id && !info.peer_session_id) { |
0febc7b3 | 701 | if (!tunnel) { |
309795f4 JC |
702 | struct l2tp_tunnel_cfg tcfg = { |
703 | .encap = L2TP_ENCAPTYPE_UDP, | |
309795f4 | 704 | }; |
3e1bc8bf GN |
705 | |
706 | /* Prevent l2tp_tunnel_register() from trying to set up | |
707 | * a kernel socket. | |
708 | */ | |
a408194a | 709 | if (info.fd < 0) { |
3e1bc8bf GN |
710 | error = -EBADF; |
711 | goto end; | |
712 | } | |
713 | ||
c9ccd4c6 | 714 | error = l2tp_tunnel_create(info.fd, |
a408194a GN |
715 | info.version, |
716 | info.tunnel_id, | |
717 | info.peer_tunnel_id, &tcfg, | |
718 | &tunnel); | |
309795f4 JC |
719 | if (error < 0) |
720 | goto end; | |
6b9f3423 GN |
721 | |
722 | l2tp_tunnel_inc_refcount(tunnel); | |
723 | error = l2tp_tunnel_register(tunnel, sock_net(sk), | |
724 | &tcfg); | |
725 | if (error < 0) { | |
726 | kfree(tunnel); | |
727 | goto end; | |
728 | } | |
729 | drop_tunnel = true; | |
bda06be2 | 730 | new_tunnel = true; |
309795f4 | 731 | } |
fd558d18 | 732 | } else { |
fd558d18 JC |
733 | /* Error if we can't find the tunnel */ |
734 | error = -ENOENT; | |
0febc7b3 | 735 | if (!tunnel) |
fd558d18 JC |
736 | goto end; |
737 | ||
738 | /* Error if socket is not prepped */ | |
0febc7b3 | 739 | if (!tunnel->sock) |
fd558d18 JC |
740 | goto end; |
741 | } | |
742 | ||
b79585f5 | 743 | if (tunnel->peer_tunnel_id == 0) |
a408194a | 744 | tunnel->peer_tunnel_id = info.peer_tunnel_id; |
fd558d18 | 745 | |
01e28b92 | 746 | session = l2tp_tunnel_get_session(tunnel, info.session_id); |
dbdbc73b GN |
747 | if (session) { |
748 | drop_refcnt = true; | |
7ac6ab1f GN |
749 | |
750 | if (session->pwtype != L2TP_PWTYPE_PPP) { | |
751 | error = -EPROTOTYPE; | |
752 | goto end; | |
753 | } | |
754 | ||
dbdbc73b GN |
755 | ps = l2tp_session_priv(session); |
756 | ||
757 | /* Using a pre-existing session is fine as long as it hasn't | |
758 | * been connected yet. | |
309795f4 | 759 | */ |
ee40fb2e GN |
760 | mutex_lock(&ps->sk_lock); |
761 | if (rcu_dereference_protected(ps->sk, | |
3d609342 GN |
762 | lockdep_is_held(&ps->sk_lock)) || |
763 | ps->__sk) { | |
ee40fb2e | 764 | mutex_unlock(&ps->sk_lock); |
dbdbc73b GN |
765 | error = -EEXIST; |
766 | goto end; | |
767 | } | |
309795f4 | 768 | } else { |
90904ff5 | 769 | cfg.pw_type = L2TP_PWTYPE_PPP; |
309795f4 | 770 | |
dbdbc73b | 771 | session = l2tp_session_create(sizeof(struct pppol2tp_session), |
a408194a GN |
772 | tunnel, info.session_id, |
773 | info.peer_session_id, &cfg); | |
dbdbc73b GN |
774 | if (IS_ERR(session)) { |
775 | error = PTR_ERR(session); | |
309795f4 | 776 | goto end; |
dbdbc73b | 777 | } |
3953ae7b | 778 | |
f98be6c6 | 779 | pppol2tp_session_init(session); |
ee40fb2e | 780 | ps = l2tp_session_priv(session); |
3953ae7b | 781 | l2tp_session_inc_refcount(session); |
ee40fb2e GN |
782 | |
783 | mutex_lock(&ps->sk_lock); | |
3953ae7b GN |
784 | error = l2tp_session_register(session, tunnel); |
785 | if (error < 0) { | |
ee40fb2e | 786 | mutex_unlock(&ps->sk_lock); |
3953ae7b GN |
787 | kfree(session); |
788 | goto end; | |
789 | } | |
790 | drop_refcnt = true; | |
bda06be2 | 791 | new_session = true; |
fd558d18 JC |
792 | } |
793 | ||
fd558d18 JC |
794 | /* Special case: if source & dest session_id == 0x0000, this |
795 | * socket is being created to manage the tunnel. Just set up | |
796 | * the internal context for use by ioctl() and sockopt() | |
797 | * handlers. | |
798 | */ | |
6c0ec37b | 799 | if (session->session_id == 0 && session->peer_session_id == 0) { |
fd558d18 JC |
800 | error = 0; |
801 | goto out_no_ppp; | |
802 | } | |
803 | ||
804 | /* The only header we need to worry about is the L2TP | |
805 | * header. This size is different depending on whether | |
806 | * sequence numbers are enabled for the data channel. | |
807 | */ | |
808 | po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
809 | ||
810 | po->chan.private = sk; | |
811 | po->chan.ops = &pppol2tp_chan_ops; | |
789141b2 | 812 | po->chan.mtu = pppol2tp_tunnel_mtu(tunnel); |
fd558d18 JC |
813 | |
814 | error = ppp_register_net_channel(sock_net(sk), &po->chan); | |
ee40fb2e GN |
815 | if (error) { |
816 | mutex_unlock(&ps->sk_lock); | |
fd558d18 | 817 | goto end; |
ee40fb2e | 818 | } |
fd558d18 JC |
819 | |
820 | out_no_ppp: | |
821 | /* This is how we get the session context from the socket. */ | |
822 | sk->sk_user_data = session; | |
ee40fb2e GN |
823 | rcu_assign_pointer(ps->sk, sk); |
824 | mutex_unlock(&ps->sk_lock); | |
825 | ||
f98be6c6 GN |
826 | /* Keep the reference we've grabbed on the session: sk doesn't expect |
827 | * the session to disappear. pppol2tp_session_destruct() is responsible | |
828 | * for dropping it. | |
829 | */ | |
830 | drop_refcnt = false; | |
831 | ||
fd558d18 | 832 | sk->sk_state = PPPOX_CONNECTED; |
fd558d18 JC |
833 | |
834 | end: | |
bda06be2 GN |
835 | if (error) { |
836 | if (new_session) | |
837 | l2tp_session_delete(session); | |
838 | if (new_tunnel) | |
839 | l2tp_tunnel_delete(tunnel); | |
840 | } | |
dbdbc73b GN |
841 | if (drop_refcnt) |
842 | l2tp_session_dec_refcount(session); | |
f9e56baf GN |
843 | if (drop_tunnel) |
844 | l2tp_tunnel_dec_refcount(tunnel); | |
fd558d18 JC |
845 | release_sock(sk); |
846 | ||
847 | return error; | |
848 | } | |
849 | ||
309795f4 JC |
850 | #ifdef CONFIG_L2TP_V3 |
851 | ||
f026bc29 GN |
852 | /* Called when creating sessions via the netlink interface. */ |
853 | static int pppol2tp_session_create(struct net *net, struct l2tp_tunnel *tunnel, | |
854 | u32 session_id, u32 peer_session_id, | |
855 | struct l2tp_session_cfg *cfg) | |
309795f4 JC |
856 | { |
857 | int error; | |
309795f4 | 858 | struct l2tp_session *session; |
309795f4 | 859 | |
309795f4 | 860 | /* Error if tunnel socket is not prepped */ |
f026bc29 GN |
861 | if (!tunnel->sock) { |
862 | error = -ENOENT; | |
3953ae7b | 863 | goto err; |
f026bc29 | 864 | } |
309795f4 | 865 | |
309795f4 | 866 | /* Allocate and initialize a new session context. */ |
309795f4 JC |
867 | session = l2tp_session_create(sizeof(struct pppol2tp_session), |
868 | tunnel, session_id, | |
869 | peer_session_id, cfg); | |
dbdbc73b GN |
870 | if (IS_ERR(session)) { |
871 | error = PTR_ERR(session); | |
3953ae7b | 872 | goto err; |
dbdbc73b | 873 | } |
309795f4 | 874 | |
f98be6c6 | 875 | pppol2tp_session_init(session); |
309795f4 | 876 | |
3953ae7b GN |
877 | error = l2tp_session_register(session, tunnel); |
878 | if (error < 0) | |
879 | goto err_sess; | |
309795f4 | 880 | |
3953ae7b | 881 | return 0; |
309795f4 | 882 | |
3953ae7b GN |
883 | err_sess: |
884 | kfree(session); | |
885 | err: | |
309795f4 JC |
886 | return error; |
887 | } | |
888 | ||
309795f4 JC |
889 | #endif /* CONFIG_L2TP_V3 */ |
890 | ||
fd558d18 JC |
891 | /* getname() support. |
892 | */ | |
893 | static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, | |
9b2c45d4 | 894 | int peer) |
fd558d18 | 895 | { |
e0d4435f | 896 | int len = 0; |
fd558d18 JC |
897 | int error = 0; |
898 | struct l2tp_session *session; | |
899 | struct l2tp_tunnel *tunnel; | |
900 | struct sock *sk = sock->sk; | |
901 | struct inet_sock *inet; | |
902 | struct pppol2tp_session *pls; | |
903 | ||
904 | error = -ENOTCONN; | |
0febc7b3 | 905 | if (!sk) |
fd558d18 | 906 | goto end; |
56cff471 | 907 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
fd558d18 JC |
908 | goto end; |
909 | ||
910 | error = -EBADF; | |
911 | session = pppol2tp_sock_to_session(sk); | |
0febc7b3 | 912 | if (!session) |
fd558d18 JC |
913 | goto end; |
914 | ||
915 | pls = l2tp_session_priv(session); | |
7198c77a | 916 | tunnel = session->tunnel; |
fd558d18 | 917 | |
bbdb32cb | 918 | inet = inet_sk(tunnel->sock); |
6c0ec37b | 919 | if (tunnel->version == 2 && tunnel->sock->sk_family == AF_INET) { |
e0d4435f | 920 | struct sockaddr_pppol2tp sp; |
b71a61cc | 921 | |
e0d4435f JC |
922 | len = sizeof(sp); |
923 | memset(&sp, 0, len); | |
924 | sp.sa_family = AF_PPPOX; | |
925 | sp.sa_protocol = PX_PROTO_OL2TP; | |
926 | sp.pppol2tp.fd = tunnel->fd; | |
927 | sp.pppol2tp.pid = pls->owner; | |
928 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
929 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
930 | sp.pppol2tp.s_session = session->session_id; | |
931 | sp.pppol2tp.d_session = session->peer_session_id; | |
932 | sp.pppol2tp.addr.sin_family = AF_INET; | |
933 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
934 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
935 | memcpy(uaddr, &sp, len); | |
d2cf3361 | 936 | #if IS_ENABLED(CONFIG_IPV6) |
6c0ec37b | 937 | } else if (tunnel->version == 2 && tunnel->sock->sk_family == AF_INET6) { |
d2cf3361 | 938 | struct sockaddr_pppol2tpin6 sp; |
efe4208f | 939 | |
d2cf3361 BL |
940 | len = sizeof(sp); |
941 | memset(&sp, 0, len); | |
942 | sp.sa_family = AF_PPPOX; | |
943 | sp.sa_protocol = PX_PROTO_OL2TP; | |
944 | sp.pppol2tp.fd = tunnel->fd; | |
945 | sp.pppol2tp.pid = pls->owner; | |
946 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
947 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
948 | sp.pppol2tp.s_session = session->session_id; | |
949 | sp.pppol2tp.d_session = session->peer_session_id; | |
950 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
951 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
efe4208f ED |
952 | memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr, |
953 | sizeof(tunnel->sock->sk_v6_daddr)); | |
d2cf3361 | 954 | memcpy(uaddr, &sp, len); |
6c0ec37b | 955 | } else if (tunnel->version == 3 && tunnel->sock->sk_family == AF_INET6) { |
d2cf3361 | 956 | struct sockaddr_pppol2tpv3in6 sp; |
efe4208f | 957 | |
d2cf3361 BL |
958 | len = sizeof(sp); |
959 | memset(&sp, 0, len); | |
960 | sp.sa_family = AF_PPPOX; | |
961 | sp.sa_protocol = PX_PROTO_OL2TP; | |
962 | sp.pppol2tp.fd = tunnel->fd; | |
963 | sp.pppol2tp.pid = pls->owner; | |
964 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
965 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
966 | sp.pppol2tp.s_session = session->session_id; | |
967 | sp.pppol2tp.d_session = session->peer_session_id; | |
968 | sp.pppol2tp.addr.sin6_family = AF_INET6; | |
969 | sp.pppol2tp.addr.sin6_port = inet->inet_dport; | |
efe4208f ED |
970 | memcpy(&sp.pppol2tp.addr.sin6_addr, &tunnel->sock->sk_v6_daddr, |
971 | sizeof(tunnel->sock->sk_v6_daddr)); | |
d2cf3361 BL |
972 | memcpy(uaddr, &sp, len); |
973 | #endif | |
e0d4435f JC |
974 | } else if (tunnel->version == 3) { |
975 | struct sockaddr_pppol2tpv3 sp; | |
b71a61cc | 976 | |
e0d4435f JC |
977 | len = sizeof(sp); |
978 | memset(&sp, 0, len); | |
979 | sp.sa_family = AF_PPPOX; | |
980 | sp.sa_protocol = PX_PROTO_OL2TP; | |
981 | sp.pppol2tp.fd = tunnel->fd; | |
982 | sp.pppol2tp.pid = pls->owner; | |
983 | sp.pppol2tp.s_tunnel = tunnel->tunnel_id; | |
984 | sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id; | |
985 | sp.pppol2tp.s_session = session->session_id; | |
986 | sp.pppol2tp.d_session = session->peer_session_id; | |
987 | sp.pppol2tp.addr.sin_family = AF_INET; | |
988 | sp.pppol2tp.addr.sin_port = inet->inet_dport; | |
989 | sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr; | |
990 | memcpy(uaddr, &sp, len); | |
991 | } | |
fd558d18 | 992 | |
9b2c45d4 | 993 | error = len; |
fd558d18 | 994 | |
fd558d18 | 995 | sock_put(sk); |
fd558d18 JC |
996 | end: |
997 | return error; | |
998 | } | |
999 | ||
1000 | /**************************************************************************** | |
1001 | * ioctl() handlers. | |
1002 | * | |
1003 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1004 | * sockets. However, in order to control kernel tunnel features, we allow | |
1005 | * userspace to create a special "tunnel" PPPoX socket which is used for | |
1006 | * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow | |
1007 | * the user application to issue L2TP setsockopt(), getsockopt() and ioctl() | |
1008 | * calls. | |
1009 | ****************************************************************************/ | |
1010 | ||
1011 | static void pppol2tp_copy_stats(struct pppol2tp_ioc_stats *dest, | |
7390ed8a | 1012 | const struct l2tp_stats *stats) |
fd558d18 | 1013 | { |
7390ed8a GN |
1014 | memset(dest, 0, sizeof(*dest)); |
1015 | ||
7b7c0719 TP |
1016 | dest->tx_packets = atomic_long_read(&stats->tx_packets); |
1017 | dest->tx_bytes = atomic_long_read(&stats->tx_bytes); | |
1018 | dest->tx_errors = atomic_long_read(&stats->tx_errors); | |
1019 | dest->rx_packets = atomic_long_read(&stats->rx_packets); | |
1020 | dest->rx_bytes = atomic_long_read(&stats->rx_bytes); | |
1021 | dest->rx_seq_discards = atomic_long_read(&stats->rx_seq_discards); | |
1022 | dest->rx_oos_packets = atomic_long_read(&stats->rx_oos_packets); | |
1023 | dest->rx_errors = atomic_long_read(&stats->rx_errors); | |
fd558d18 JC |
1024 | } |
1025 | ||
528534f0 GN |
1026 | static int pppol2tp_tunnel_copy_stats(struct pppol2tp_ioc_stats *stats, |
1027 | struct l2tp_tunnel *tunnel) | |
1028 | { | |
1029 | struct l2tp_session *session; | |
1030 | ||
1031 | if (!stats->session_id) { | |
528534f0 GN |
1032 | pppol2tp_copy_stats(stats, &tunnel->stats); |
1033 | return 0; | |
1034 | } | |
1035 | ||
1036 | /* If session_id is set, search the corresponding session in the | |
1037 | * context of this tunnel and record the session's statistics. | |
1038 | */ | |
1039 | session = l2tp_tunnel_get_session(tunnel, stats->session_id); | |
1040 | if (!session) | |
1041 | return -EBADR; | |
1042 | ||
1043 | if (session->pwtype != L2TP_PWTYPE_PPP) { | |
1044 | l2tp_session_dec_refcount(session); | |
1045 | return -EBADR; | |
1046 | } | |
1047 | ||
528534f0 GN |
1048 | pppol2tp_copy_stats(stats, &session->stats); |
1049 | l2tp_session_dec_refcount(session); | |
1050 | ||
1051 | return 0; | |
1052 | } | |
1053 | ||
fd558d18 JC |
1054 | static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, |
1055 | unsigned long arg) | |
1056 | { | |
528534f0 | 1057 | struct pppol2tp_ioc_stats stats; |
fd558d18 | 1058 | struct l2tp_session *session; |
79e6760e GN |
1059 | |
1060 | switch (cmd) { | |
1061 | case PPPIOCGMRU: | |
1062 | case PPPIOCGFLAGS: | |
1063 | session = sock->sk->sk_user_data; | |
1064 | if (!session) | |
1065 | return -ENOTCONN; | |
fd558d18 | 1066 | |
45faeff1 TP |
1067 | if (WARN_ON(session->magic != L2TP_SESSION_MAGIC)) |
1068 | return -EBADF; | |
1069 | ||
79e6760e GN |
1070 | /* Not defined for tunnels */ |
1071 | if (!session->session_id && !session->peer_session_id) | |
1072 | return -ENOSYS; | |
fd558d18 | 1073 | |
79e6760e GN |
1074 | if (put_user(0, (int __user *)arg)) |
1075 | return -EFAULT; | |
1076 | break; | |
1077 | ||
1078 | case PPPIOCSMRU: | |
1079 | case PPPIOCSFLAGS: | |
1080 | session = sock->sk->sk_user_data; | |
1081 | if (!session) | |
1082 | return -ENOTCONN; | |
fd558d18 | 1083 | |
45faeff1 TP |
1084 | if (WARN_ON(session->magic != L2TP_SESSION_MAGIC)) |
1085 | return -EBADF; | |
1086 | ||
79e6760e GN |
1087 | /* Not defined for tunnels */ |
1088 | if (!session->session_id && !session->peer_session_id) | |
1089 | return -ENOSYS; | |
1090 | ||
503c0188 | 1091 | if (!access_ok((int __user *)arg, sizeof(int))) |
79e6760e GN |
1092 | return -EFAULT; |
1093 | break; | |
1094 | ||
1095 | case PPPIOCGL2TPSTATS: | |
1096 | session = sock->sk->sk_user_data; | |
1097 | if (!session) | |
1098 | return -ENOTCONN; | |
1099 | ||
45faeff1 TP |
1100 | if (WARN_ON(session->magic != L2TP_SESSION_MAGIC)) |
1101 | return -EBADF; | |
1102 | ||
79e6760e | 1103 | /* Session 0 represents the parent tunnel */ |
528534f0 GN |
1104 | if (!session->session_id && !session->peer_session_id) { |
1105 | u32 session_id; | |
1106 | int err; | |
1107 | ||
1108 | if (copy_from_user(&stats, (void __user *)arg, | |
1109 | sizeof(stats))) | |
1110 | return -EFAULT; | |
1111 | ||
1112 | session_id = stats.session_id; | |
1113 | err = pppol2tp_tunnel_copy_stats(&stats, | |
1114 | session->tunnel); | |
1115 | if (err < 0) | |
1116 | return err; | |
1117 | ||
1118 | stats.session_id = session_id; | |
1119 | } else { | |
b0e29063 GN |
1120 | pppol2tp_copy_stats(&stats, &session->stats); |
1121 | stats.session_id = session->session_id; | |
528534f0 GN |
1122 | } |
1123 | stats.tunnel_id = session->tunnel->tunnel_id; | |
1124 | stats.using_ipsec = l2tp_tunnel_uses_xfrm(session->tunnel); | |
1125 | ||
1126 | if (copy_to_user((void __user *)arg, &stats, sizeof(stats))) | |
1127 | return -EFAULT; | |
79e6760e GN |
1128 | break; |
1129 | ||
1130 | default: | |
4f5f85e9 | 1131 | return -ENOIOCTLCMD; |
bdd0292f | 1132 | } |
fd558d18 | 1133 | |
79e6760e | 1134 | return 0; |
fd558d18 JC |
1135 | } |
1136 | ||
1137 | /***************************************************************************** | |
1138 | * setsockopt() / getsockopt() support. | |
1139 | * | |
1140 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1141 | * sockets. In order to control kernel tunnel features, we allow userspace to | |
1142 | * create a special "tunnel" PPPoX socket which is used for control only. | |
1143 | * Tunnel PPPoX sockets have session_id == 0 and simply allow the user | |
1144 | * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls. | |
1145 | *****************************************************************************/ | |
1146 | ||
1147 | /* Tunnel setsockopt() helper. | |
1148 | */ | |
1149 | static int pppol2tp_tunnel_setsockopt(struct sock *sk, | |
1150 | struct l2tp_tunnel *tunnel, | |
1151 | int optname, int val) | |
1152 | { | |
1153 | int err = 0; | |
1154 | ||
1155 | switch (optname) { | |
1156 | case PPPOL2TP_SO_DEBUG: | |
eee049c0 | 1157 | /* Tunnel debug flags option is deprecated */ |
fd558d18 JC |
1158 | break; |
1159 | ||
1160 | default: | |
1161 | err = -ENOPROTOOPT; | |
1162 | break; | |
1163 | } | |
1164 | ||
1165 | return err; | |
1166 | } | |
1167 | ||
1168 | /* Session setsockopt helper. | |
1169 | */ | |
1170 | static int pppol2tp_session_setsockopt(struct sock *sk, | |
1171 | struct l2tp_session *session, | |
1172 | int optname, int val) | |
1173 | { | |
1174 | int err = 0; | |
fd558d18 JC |
1175 | |
1176 | switch (optname) { | |
1177 | case PPPOL2TP_SO_RECVSEQ: | |
6c0ec37b | 1178 | if (val != 0 && val != 1) { |
fd558d18 JC |
1179 | err = -EINVAL; |
1180 | break; | |
1181 | } | |
3f9b9770 | 1182 | session->recv_seq = !!val; |
fd558d18 JC |
1183 | break; |
1184 | ||
1185 | case PPPOL2TP_SO_SENDSEQ: | |
6c0ec37b | 1186 | if (val != 0 && val != 1) { |
fd558d18 JC |
1187 | err = -EINVAL; |
1188 | break; | |
1189 | } | |
3f9b9770 | 1190 | session->send_seq = !!val; |
fd558d18 | 1191 | { |
ee40fb2e GN |
1192 | struct pppox_sock *po = pppox_sk(sk); |
1193 | ||
fd558d18 JC |
1194 | po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ : |
1195 | PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
1196 | } | |
bb5016ea | 1197 | l2tp_session_set_header_len(session, session->tunnel->version); |
fd558d18 JC |
1198 | break; |
1199 | ||
1200 | case PPPOL2TP_SO_LNSMODE: | |
6c0ec37b | 1201 | if (val != 0 && val != 1) { |
fd558d18 JC |
1202 | err = -EINVAL; |
1203 | break; | |
1204 | } | |
3f9b9770 | 1205 | session->lns_mode = !!val; |
fd558d18 JC |
1206 | break; |
1207 | ||
1208 | case PPPOL2TP_SO_DEBUG: | |
eee049c0 | 1209 | /* Session debug flags option is deprecated */ |
fd558d18 JC |
1210 | break; |
1211 | ||
1212 | case PPPOL2TP_SO_REORDERTO: | |
1213 | session->reorder_timeout = msecs_to_jiffies(val); | |
fd558d18 JC |
1214 | break; |
1215 | ||
1216 | default: | |
1217 | err = -ENOPROTOOPT; | |
1218 | break; | |
1219 | } | |
1220 | ||
1221 | return err; | |
1222 | } | |
1223 | ||
1224 | /* Main setsockopt() entry point. | |
1225 | * Does API checks, then calls either the tunnel or session setsockopt | |
1226 | * handler, according to whether the PPPoL2TP socket is a for a regular | |
1227 | * session or the special tunnel type. | |
1228 | */ | |
1229 | static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, | |
a7b75c5a | 1230 | sockptr_t optval, unsigned int optlen) |
fd558d18 JC |
1231 | { |
1232 | struct sock *sk = sock->sk; | |
1233 | struct l2tp_session *session; | |
1234 | struct l2tp_tunnel *tunnel; | |
fd558d18 JC |
1235 | int val; |
1236 | int err; | |
1237 | ||
1238 | if (level != SOL_PPPOL2TP) | |
3cf521f7 | 1239 | return -EINVAL; |
fd558d18 JC |
1240 | |
1241 | if (optlen < sizeof(int)) | |
1242 | return -EINVAL; | |
1243 | ||
a7b75c5a | 1244 | if (copy_from_sockptr(&val, optval, sizeof(int))) |
fd558d18 JC |
1245 | return -EFAULT; |
1246 | ||
1247 | err = -ENOTCONN; | |
0febc7b3 | 1248 | if (!sk->sk_user_data) |
fd558d18 JC |
1249 | goto end; |
1250 | ||
1251 | /* Get session context from the socket */ | |
1252 | err = -EBADF; | |
1253 | session = pppol2tp_sock_to_session(sk); | |
0febc7b3 | 1254 | if (!session) |
fd558d18 JC |
1255 | goto end; |
1256 | ||
1257 | /* Special case: if session_id == 0x0000, treat as operation on tunnel | |
1258 | */ | |
6c0ec37b | 1259 | if (session->session_id == 0 && session->peer_session_id == 0) { |
7198c77a | 1260 | tunnel = session->tunnel; |
fd558d18 | 1261 | err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); |
7198c77a | 1262 | } else { |
fd558d18 | 1263 | err = pppol2tp_session_setsockopt(sk, session, optname, val); |
7198c77a | 1264 | } |
fd558d18 | 1265 | |
fd558d18 JC |
1266 | sock_put(sk); |
1267 | end: | |
1268 | return err; | |
1269 | } | |
1270 | ||
1271 | /* Tunnel getsockopt helper. Called with sock locked. | |
1272 | */ | |
1273 | static int pppol2tp_tunnel_getsockopt(struct sock *sk, | |
1274 | struct l2tp_tunnel *tunnel, | |
1275 | int optname, int *val) | |
1276 | { | |
1277 | int err = 0; | |
1278 | ||
1279 | switch (optname) { | |
1280 | case PPPOL2TP_SO_DEBUG: | |
eee049c0 TP |
1281 | /* Tunnel debug flags option is deprecated */ |
1282 | *val = 0; | |
fd558d18 JC |
1283 | break; |
1284 | ||
1285 | default: | |
1286 | err = -ENOPROTOOPT; | |
1287 | break; | |
1288 | } | |
1289 | ||
1290 | return err; | |
1291 | } | |
1292 | ||
1293 | /* Session getsockopt helper. Called with sock locked. | |
1294 | */ | |
1295 | static int pppol2tp_session_getsockopt(struct sock *sk, | |
1296 | struct l2tp_session *session, | |
1297 | int optname, int *val) | |
1298 | { | |
1299 | int err = 0; | |
1300 | ||
1301 | switch (optname) { | |
1302 | case PPPOL2TP_SO_RECVSEQ: | |
1303 | *val = session->recv_seq; | |
fd558d18 JC |
1304 | break; |
1305 | ||
1306 | case PPPOL2TP_SO_SENDSEQ: | |
1307 | *val = session->send_seq; | |
fd558d18 JC |
1308 | break; |
1309 | ||
1310 | case PPPOL2TP_SO_LNSMODE: | |
1311 | *val = session->lns_mode; | |
fd558d18 JC |
1312 | break; |
1313 | ||
1314 | case PPPOL2TP_SO_DEBUG: | |
eee049c0 TP |
1315 | /* Session debug flags option is deprecated */ |
1316 | *val = 0; | |
fd558d18 JC |
1317 | break; |
1318 | ||
1319 | case PPPOL2TP_SO_REORDERTO: | |
b71a61cc | 1320 | *val = (int)jiffies_to_msecs(session->reorder_timeout); |
fd558d18 JC |
1321 | break; |
1322 | ||
1323 | default: | |
1324 | err = -ENOPROTOOPT; | |
1325 | } | |
1326 | ||
1327 | return err; | |
1328 | } | |
1329 | ||
1330 | /* Main getsockopt() entry point. | |
1331 | * Does API checks, then calls either the tunnel or session getsockopt | |
1332 | * handler, according to whether the PPPoX socket is a for a regular session | |
1333 | * or the special tunnel type. | |
1334 | */ | |
e3192690 JP |
1335 | static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, |
1336 | char __user *optval, int __user *optlen) | |
fd558d18 JC |
1337 | { |
1338 | struct sock *sk = sock->sk; | |
1339 | struct l2tp_session *session; | |
1340 | struct l2tp_tunnel *tunnel; | |
1341 | int val, len; | |
1342 | int err; | |
fd558d18 JC |
1343 | |
1344 | if (level != SOL_PPPOL2TP) | |
3cf521f7 | 1345 | return -EINVAL; |
fd558d18 | 1346 | |
e3192690 | 1347 | if (get_user(len, optlen)) |
fd558d18 JC |
1348 | return -EFAULT; |
1349 | ||
1350 | len = min_t(unsigned int, len, sizeof(int)); | |
1351 | ||
1352 | if (len < 0) | |
1353 | return -EINVAL; | |
1354 | ||
1355 | err = -ENOTCONN; | |
0febc7b3 | 1356 | if (!sk->sk_user_data) |
fd558d18 JC |
1357 | goto end; |
1358 | ||
1359 | /* Get the session context */ | |
1360 | err = -EBADF; | |
1361 | session = pppol2tp_sock_to_session(sk); | |
0febc7b3 | 1362 | if (!session) |
fd558d18 JC |
1363 | goto end; |
1364 | ||
1365 | /* Special case: if session_id == 0x0000, treat as operation on tunnel */ | |
6c0ec37b | 1366 | if (session->session_id == 0 && session->peer_session_id == 0) { |
7198c77a | 1367 | tunnel = session->tunnel; |
fd558d18 | 1368 | err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); |
321a52a3 GN |
1369 | if (err) |
1370 | goto end_put_sess; | |
1371 | } else { | |
fd558d18 | 1372 | err = pppol2tp_session_getsockopt(sk, session, optname, &val); |
321a52a3 GN |
1373 | if (err) |
1374 | goto end_put_sess; | |
1375 | } | |
fd558d18 JC |
1376 | |
1377 | err = -EFAULT; | |
e3192690 | 1378 | if (put_user(len, optlen)) |
fd558d18 JC |
1379 | goto end_put_sess; |
1380 | ||
b71a61cc | 1381 | if (copy_to_user((void __user *)optval, &val, len)) |
fd558d18 JC |
1382 | goto end_put_sess; |
1383 | ||
1384 | err = 0; | |
1385 | ||
1386 | end_put_sess: | |
1387 | sock_put(sk); | |
1388 | end: | |
1389 | return err; | |
1390 | } | |
1391 | ||
1392 | /***************************************************************************** | |
1393 | * /proc filesystem for debug | |
f7faffa3 JC |
1394 | * Since the original pppol2tp driver provided /proc/net/pppol2tp for |
1395 | * L2TPv2, we dump only L2TPv2 tunnels and sessions here. | |
fd558d18 JC |
1396 | *****************************************************************************/ |
1397 | ||
1398 | static unsigned int pppol2tp_net_id; | |
1399 | ||
1400 | #ifdef CONFIG_PROC_FS | |
1401 | ||
1402 | struct pppol2tp_seq_data { | |
1403 | struct seq_net_private p; | |
1404 | int tunnel_idx; /* current tunnel */ | |
1405 | int session_idx; /* index of session within current tunnel */ | |
1406 | struct l2tp_tunnel *tunnel; | |
1407 | struct l2tp_session *session; /* NULL means get next tunnel */ | |
1408 | }; | |
1409 | ||
1410 | static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd) | |
1411 | { | |
0e0c3fee GN |
1412 | /* Drop reference taken during previous invocation */ |
1413 | if (pd->tunnel) | |
1414 | l2tp_tunnel_dec_refcount(pd->tunnel); | |
1415 | ||
f7faffa3 | 1416 | for (;;) { |
0e0c3fee | 1417 | pd->tunnel = l2tp_tunnel_get_nth(net, pd->tunnel_idx); |
f7faffa3 JC |
1418 | pd->tunnel_idx++; |
1419 | ||
0e0c3fee GN |
1420 | /* Only accept L2TPv2 tunnels */ |
1421 | if (!pd->tunnel || pd->tunnel->version == 2) | |
1422 | return; | |
f7faffa3 | 1423 | |
0e0c3fee | 1424 | l2tp_tunnel_dec_refcount(pd->tunnel); |
f7faffa3 | 1425 | } |
fd558d18 JC |
1426 | } |
1427 | ||
1428 | static void pppol2tp_next_session(struct net *net, struct pppol2tp_seq_data *pd) | |
1429 | { | |
83494407 GN |
1430 | /* Drop reference taken during previous invocation */ |
1431 | if (pd->session) | |
1432 | l2tp_session_dec_refcount(pd->session); | |
1433 | ||
a4346210 | 1434 | pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx); |
fd558d18 | 1435 | pd->session_idx++; |
f7faffa3 | 1436 | |
0febc7b3 | 1437 | if (!pd->session) { |
fd558d18 JC |
1438 | pd->session_idx = 0; |
1439 | pppol2tp_next_tunnel(net, pd); | |
1440 | } | |
1441 | } | |
1442 | ||
1443 | static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs) | |
1444 | { | |
1445 | struct pppol2tp_seq_data *pd = SEQ_START_TOKEN; | |
1446 | loff_t pos = *offs; | |
1447 | struct net *net; | |
1448 | ||
1449 | if (!pos) | |
1450 | goto out; | |
1451 | ||
ebb4f5e6 TP |
1452 | if (WARN_ON(!m->private)) { |
1453 | pd = NULL; | |
1454 | goto out; | |
1455 | } | |
1456 | ||
fd558d18 JC |
1457 | pd = m->private; |
1458 | net = seq_file_net(m); | |
1459 | ||
0febc7b3 | 1460 | if (!pd->tunnel) |
fd558d18 JC |
1461 | pppol2tp_next_tunnel(net, pd); |
1462 | else | |
1463 | pppol2tp_next_session(net, pd); | |
1464 | ||
1465 | /* NULL tunnel and session indicates end of list */ | |
0febc7b3 | 1466 | if (!pd->tunnel && !pd->session) |
fd558d18 JC |
1467 | pd = NULL; |
1468 | ||
1469 | out: | |
1470 | return pd; | |
1471 | } | |
1472 | ||
1473 | static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1474 | { | |
1475 | (*pos)++; | |
1476 | return NULL; | |
1477 | } | |
1478 | ||
1479 | static void pppol2tp_seq_stop(struct seq_file *p, void *v) | |
1480 | { | |
0e0c3fee GN |
1481 | struct pppol2tp_seq_data *pd = v; |
1482 | ||
1483 | if (!pd || pd == SEQ_START_TOKEN) | |
1484 | return; | |
1485 | ||
83494407 GN |
1486 | /* Drop reference taken by last invocation of pppol2tp_next_session() |
1487 | * or pppol2tp_next_tunnel(). | |
1488 | */ | |
1489 | if (pd->session) { | |
1490 | l2tp_session_dec_refcount(pd->session); | |
1491 | pd->session = NULL; | |
1492 | } | |
5411b618 | 1493 | if (pd->tunnel) { |
0e0c3fee | 1494 | l2tp_tunnel_dec_refcount(pd->tunnel); |
5411b618 | 1495 | pd->tunnel = NULL; |
5411b618 | 1496 | } |
fd558d18 JC |
1497 | } |
1498 | ||
1499 | static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v) | |
1500 | { | |
1501 | struct l2tp_tunnel *tunnel = v; | |
1502 | ||
1503 | seq_printf(m, "\nTUNNEL '%s', %c %d\n", | |
1504 | tunnel->name, | |
1505 | (tunnel == tunnel->sock->sk_user_data) ? 'Y' : 'N', | |
fbea9e07 | 1506 | refcount_read(&tunnel->ref_count) - 1); |
7b7c0719 | 1507 | seq_printf(m, " %08x %ld/%ld/%ld %ld/%ld/%ld\n", |
eee049c0 | 1508 | 0, |
7b7c0719 TP |
1509 | atomic_long_read(&tunnel->stats.tx_packets), |
1510 | atomic_long_read(&tunnel->stats.tx_bytes), | |
1511 | atomic_long_read(&tunnel->stats.tx_errors), | |
1512 | atomic_long_read(&tunnel->stats.rx_packets), | |
1513 | atomic_long_read(&tunnel->stats.rx_bytes), | |
1514 | atomic_long_read(&tunnel->stats.rx_errors)); | |
fd558d18 JC |
1515 | } |
1516 | ||
1517 | static void pppol2tp_seq_session_show(struct seq_file *m, void *v) | |
1518 | { | |
1519 | struct l2tp_session *session = v; | |
1520 | struct l2tp_tunnel *tunnel = session->tunnel; | |
ee40fb2e GN |
1521 | unsigned char state; |
1522 | char user_data_ok; | |
1523 | struct sock *sk; | |
fd558d18 JC |
1524 | u32 ip = 0; |
1525 | u16 port = 0; | |
1526 | ||
1527 | if (tunnel->sock) { | |
1528 | struct inet_sock *inet = inet_sk(tunnel->sock); | |
b71a61cc | 1529 | |
fd558d18 JC |
1530 | ip = ntohl(inet->inet_saddr); |
1531 | port = ntohs(inet->inet_sport); | |
1532 | } | |
1533 | ||
ee40fb2e GN |
1534 | sk = pppol2tp_session_get_sock(session); |
1535 | if (sk) { | |
1536 | state = sk->sk_state; | |
1537 | user_data_ok = (session == sk->sk_user_data) ? 'Y' : 'N'; | |
1538 | } else { | |
1539 | state = 0; | |
1540 | user_data_ok = 'N'; | |
1541 | } | |
1542 | ||
9f7da9a0 | 1543 | seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> %04X/%04X %d %c\n", |
fd558d18 JC |
1544 | session->name, ip, port, |
1545 | tunnel->tunnel_id, | |
1546 | session->session_id, | |
1547 | tunnel->peer_tunnel_id, | |
1548 | session->peer_session_id, | |
ee40fb2e | 1549 | state, user_data_ok); |
789141b2 | 1550 | seq_printf(m, " 0/0/%c/%c/%s %08x %u\n", |
fd558d18 JC |
1551 | session->recv_seq ? 'R' : '-', |
1552 | session->send_seq ? 'S' : '-', | |
1553 | session->lns_mode ? "LNS" : "LAC", | |
eee049c0 | 1554 | 0, |
fd558d18 | 1555 | jiffies_to_msecs(session->reorder_timeout)); |
7b7c0719 | 1556 | seq_printf(m, " %hu/%hu %ld/%ld/%ld %ld/%ld/%ld\n", |
fd558d18 | 1557 | session->nr, session->ns, |
7b7c0719 TP |
1558 | atomic_long_read(&session->stats.tx_packets), |
1559 | atomic_long_read(&session->stats.tx_bytes), | |
1560 | atomic_long_read(&session->stats.tx_errors), | |
1561 | atomic_long_read(&session->stats.rx_packets), | |
1562 | atomic_long_read(&session->stats.rx_bytes), | |
1563 | atomic_long_read(&session->stats.rx_errors)); | |
9345471b | 1564 | |
ee40fb2e GN |
1565 | if (sk) { |
1566 | struct pppox_sock *po = pppox_sk(sk); | |
1567 | ||
9345471b | 1568 | seq_printf(m, " interface %s\n", ppp_dev_name(&po->chan)); |
ee40fb2e GN |
1569 | sock_put(sk); |
1570 | } | |
fd558d18 JC |
1571 | } |
1572 | ||
1573 | static int pppol2tp_seq_show(struct seq_file *m, void *v) | |
1574 | { | |
1575 | struct pppol2tp_seq_data *pd = v; | |
1576 | ||
1577 | /* display header on line 1 */ | |
1578 | if (v == SEQ_START_TOKEN) { | |
1579 | seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n"); | |
1580 | seq_puts(m, "TUNNEL name, user-data-ok session-count\n"); | |
1581 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
9f7da9a0 | 1582 | seq_puts(m, " SESSION name, addr/port src-tid/sid dest-tid/sid state user-data-ok\n"); |
fd558d18 JC |
1583 | seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n"); |
1584 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
1585 | goto out; | |
1586 | } | |
1587 | ||
83494407 | 1588 | if (!pd->session) |
fd558d18 | 1589 | pppol2tp_seq_tunnel_show(m, pd->tunnel); |
83494407 | 1590 | else |
fd558d18 JC |
1591 | pppol2tp_seq_session_show(m, pd->session); |
1592 | ||
1593 | out: | |
1594 | return 0; | |
1595 | } | |
1596 | ||
1597 | static const struct seq_operations pppol2tp_seq_ops = { | |
1598 | .start = pppol2tp_seq_start, | |
1599 | .next = pppol2tp_seq_next, | |
1600 | .stop = pppol2tp_seq_stop, | |
1601 | .show = pppol2tp_seq_show, | |
1602 | }; | |
fd558d18 JC |
1603 | #endif /* CONFIG_PROC_FS */ |
1604 | ||
1605 | /***************************************************************************** | |
1606 | * Network namespace | |
1607 | *****************************************************************************/ | |
1608 | ||
1609 | static __net_init int pppol2tp_init_net(struct net *net) | |
1610 | { | |
1611 | struct proc_dir_entry *pde; | |
1612 | int err = 0; | |
1613 | ||
c3506372 | 1614 | pde = proc_create_net("pppol2tp", 0444, net->proc_net, |
8ce9825a | 1615 | &pppol2tp_seq_ops, sizeof(struct pppol2tp_seq_data)); |
fd558d18 JC |
1616 | if (!pde) { |
1617 | err = -ENOMEM; | |
1618 | goto out; | |
1619 | } | |
1620 | ||
1621 | out: | |
1622 | return err; | |
1623 | } | |
1624 | ||
1625 | static __net_exit void pppol2tp_exit_net(struct net *net) | |
1626 | { | |
ece31ffd | 1627 | remove_proc_entry("pppol2tp", net->proc_net); |
fd558d18 JC |
1628 | } |
1629 | ||
1630 | static struct pernet_operations pppol2tp_net_ops = { | |
1631 | .init = pppol2tp_init_net, | |
1632 | .exit = pppol2tp_exit_net, | |
1633 | .id = &pppol2tp_net_id, | |
1634 | }; | |
1635 | ||
1636 | /***************************************************************************** | |
1637 | * Init and cleanup | |
1638 | *****************************************************************************/ | |
1639 | ||
1640 | static const struct proto_ops pppol2tp_ops = { | |
1641 | .family = AF_PPPOX, | |
1642 | .owner = THIS_MODULE, | |
1643 | .release = pppol2tp_release, | |
1644 | .bind = sock_no_bind, | |
1645 | .connect = pppol2tp_connect, | |
1646 | .socketpair = sock_no_socketpair, | |
1647 | .accept = sock_no_accept, | |
1648 | .getname = pppol2tp_getname, | |
a11e1d43 | 1649 | .poll = datagram_poll, |
fd558d18 JC |
1650 | .listen = sock_no_listen, |
1651 | .shutdown = sock_no_shutdown, | |
1652 | .setsockopt = pppol2tp_setsockopt, | |
1653 | .getsockopt = pppol2tp_getsockopt, | |
1654 | .sendmsg = pppol2tp_sendmsg, | |
1655 | .recvmsg = pppol2tp_recvmsg, | |
1656 | .mmap = sock_no_mmap, | |
1657 | .ioctl = pppox_ioctl, | |
055d8824 AB |
1658 | #ifdef CONFIG_COMPAT |
1659 | .compat_ioctl = pppox_compat_ioctl, | |
1660 | #endif | |
fd558d18 JC |
1661 | }; |
1662 | ||
756e64a0 | 1663 | static const struct pppox_proto pppol2tp_proto = { |
fd558d18 | 1664 | .create = pppol2tp_create, |
e1558a93 WY |
1665 | .ioctl = pppol2tp_ioctl, |
1666 | .owner = THIS_MODULE, | |
fd558d18 JC |
1667 | }; |
1668 | ||
309795f4 JC |
1669 | #ifdef CONFIG_L2TP_V3 |
1670 | ||
1671 | static const struct l2tp_nl_cmd_ops pppol2tp_nl_cmd_ops = { | |
1672 | .session_create = pppol2tp_session_create, | |
cf2f5c88 | 1673 | .session_delete = l2tp_session_delete, |
309795f4 JC |
1674 | }; |
1675 | ||
1676 | #endif /* CONFIG_L2TP_V3 */ | |
1677 | ||
fd558d18 JC |
1678 | static int __init pppol2tp_init(void) |
1679 | { | |
1680 | int err; | |
1681 | ||
1682 | err = register_pernet_device(&pppol2tp_net_ops); | |
1683 | if (err) | |
1684 | goto out; | |
1685 | ||
1686 | err = proto_register(&pppol2tp_sk_proto, 0); | |
1687 | if (err) | |
1688 | goto out_unregister_pppol2tp_pernet; | |
1689 | ||
1690 | err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto); | |
1691 | if (err) | |
1692 | goto out_unregister_pppol2tp_proto; | |
1693 | ||
309795f4 JC |
1694 | #ifdef CONFIG_L2TP_V3 |
1695 | err = l2tp_nl_register_ops(L2TP_PWTYPE_PPP, &pppol2tp_nl_cmd_ops); | |
1696 | if (err) | |
1697 | goto out_unregister_pppox; | |
1698 | #endif | |
1699 | ||
a4ca44fa | 1700 | pr_info("PPPoL2TP kernel driver, %s\n", PPPOL2TP_DRV_VERSION); |
fd558d18 JC |
1701 | |
1702 | out: | |
1703 | return err; | |
309795f4 JC |
1704 | |
1705 | #ifdef CONFIG_L2TP_V3 | |
1706 | out_unregister_pppox: | |
1707 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
1708 | #endif | |
fd558d18 JC |
1709 | out_unregister_pppol2tp_proto: |
1710 | proto_unregister(&pppol2tp_sk_proto); | |
1711 | out_unregister_pppol2tp_pernet: | |
1712 | unregister_pernet_device(&pppol2tp_net_ops); | |
1713 | goto out; | |
1714 | } | |
1715 | ||
1716 | static void __exit pppol2tp_exit(void) | |
1717 | { | |
309795f4 JC |
1718 | #ifdef CONFIG_L2TP_V3 |
1719 | l2tp_nl_unregister_ops(L2TP_PWTYPE_PPP); | |
1720 | #endif | |
fd558d18 JC |
1721 | unregister_pppox_proto(PX_PROTO_OL2TP); |
1722 | proto_unregister(&pppol2tp_sk_proto); | |
1723 | unregister_pernet_device(&pppol2tp_net_ops); | |
1724 | } | |
1725 | ||
1726 | module_init(pppol2tp_init); | |
1727 | module_exit(pppol2tp_exit); | |
1728 | ||
1729 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
1730 | MODULE_DESCRIPTION("PPP over L2TP over UDP"); | |
1731 | MODULE_LICENSE("GPL"); | |
1732 | MODULE_VERSION(PPPOL2TP_DRV_VERSION); | |
681b4d88 | 1733 | MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OL2TP); |
249ee819 | 1734 | MODULE_ALIAS_L2TP_PWTYPE(7); |