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3557baab JC |
1 | /***************************************************************************** |
2 | * Linux PPP over L2TP (PPPoX/PPPoL2TP) Sockets | |
3 | * | |
4 | * PPPoX --- Generic PPP encapsulation socket family | |
5 | * PPPoL2TP --- PPP over L2TP (RFC 2661) | |
6 | * | |
7 | * Version: 1.0.0 | |
8 | * | |
9 | * Authors: Martijn van Oosterhout <kleptog@svana.org> | |
10 | * James Chapman (jchapman@katalix.com) | |
11 | * Contributors: | |
12 | * Michal Ostrowski <mostrows@speakeasy.net> | |
13 | * Arnaldo Carvalho de Melo <acme@xconectiva.com.br> | |
14 | * David S. Miller (davem@redhat.com) | |
15 | * | |
16 | * License: | |
17 | * This program is free software; you can redistribute it and/or | |
18 | * modify it under the terms of the GNU General Public License | |
19 | * as published by the Free Software Foundation; either version | |
20 | * 2 of the License, or (at your option) any later version. | |
21 | * | |
22 | */ | |
23 | ||
24 | /* This driver handles only L2TP data frames; control frames are handled by a | |
25 | * userspace application. | |
26 | * | |
27 | * To send data in an L2TP session, userspace opens a PPPoL2TP socket and | |
28 | * attaches it to a bound UDP socket with local tunnel_id / session_id and | |
29 | * peer tunnel_id / session_id set. Data can then be sent or received using | |
30 | * regular socket sendmsg() / recvmsg() calls. Kernel parameters of the socket | |
31 | * can be read or modified using ioctl() or [gs]etsockopt() calls. | |
32 | * | |
33 | * When a PPPoL2TP socket is connected with local and peer session_id values | |
34 | * zero, the socket is treated as a special tunnel management socket. | |
35 | * | |
36 | * Here's example userspace code to create a socket for sending/receiving data | |
37 | * over an L2TP session:- | |
38 | * | |
39 | * struct sockaddr_pppol2tp sax; | |
40 | * int fd; | |
41 | * int session_fd; | |
42 | * | |
43 | * fd = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP); | |
44 | * | |
45 | * sax.sa_family = AF_PPPOX; | |
46 | * sax.sa_protocol = PX_PROTO_OL2TP; | |
47 | * sax.pppol2tp.fd = tunnel_fd; // bound UDP socket | |
48 | * sax.pppol2tp.addr.sin_addr.s_addr = addr->sin_addr.s_addr; | |
49 | * sax.pppol2tp.addr.sin_port = addr->sin_port; | |
50 | * sax.pppol2tp.addr.sin_family = AF_INET; | |
51 | * sax.pppol2tp.s_tunnel = tunnel_id; | |
52 | * sax.pppol2tp.s_session = session_id; | |
53 | * sax.pppol2tp.d_tunnel = peer_tunnel_id; | |
54 | * sax.pppol2tp.d_session = peer_session_id; | |
55 | * | |
56 | * session_fd = connect(fd, (struct sockaddr *)&sax, sizeof(sax)); | |
57 | * | |
58 | * A pppd plugin that allows PPP traffic to be carried over L2TP using | |
59 | * this driver is available from the OpenL2TP project at | |
60 | * http://openl2tp.sourceforge.net. | |
61 | */ | |
62 | ||
63 | #include <linux/module.h> | |
3557baab JC |
64 | #include <linux/string.h> |
65 | #include <linux/list.h> | |
66 | #include <asm/uaccess.h> | |
67 | ||
68 | #include <linux/kernel.h> | |
69 | #include <linux/spinlock.h> | |
70 | #include <linux/kthread.h> | |
71 | #include <linux/sched.h> | |
72 | #include <linux/slab.h> | |
73 | #include <linux/errno.h> | |
74 | #include <linux/jiffies.h> | |
75 | ||
76 | #include <linux/netdevice.h> | |
77 | #include <linux/net.h> | |
78 | #include <linux/inetdevice.h> | |
79 | #include <linux/skbuff.h> | |
80 | #include <linux/init.h> | |
81 | #include <linux/ip.h> | |
82 | #include <linux/udp.h> | |
83 | #include <linux/if_pppox.h> | |
84 | #include <linux/if_pppol2tp.h> | |
85 | #include <net/sock.h> | |
86 | #include <linux/ppp_channel.h> | |
87 | #include <linux/ppp_defs.h> | |
88 | #include <linux/if_ppp.h> | |
89 | #include <linux/file.h> | |
90 | #include <linux/hash.h> | |
91 | #include <linux/sort.h> | |
92 | #include <linux/proc_fs.h> | |
4e9fb801 | 93 | #include <linux/nsproxy.h> |
457c4cbc | 94 | #include <net/net_namespace.h> |
4e9fb801 | 95 | #include <net/netns/generic.h> |
3557baab JC |
96 | #include <net/dst.h> |
97 | #include <net/ip.h> | |
98 | #include <net/udp.h> | |
99 | #include <net/xfrm.h> | |
100 | ||
101 | #include <asm/byteorder.h> | |
102 | #include <asm/atomic.h> | |
103 | ||
104 | ||
105 | #define PPPOL2TP_DRV_VERSION "V1.0" | |
106 | ||
107 | /* L2TP header constants */ | |
108 | #define L2TP_HDRFLAG_T 0x8000 | |
109 | #define L2TP_HDRFLAG_L 0x4000 | |
110 | #define L2TP_HDRFLAG_S 0x0800 | |
111 | #define L2TP_HDRFLAG_O 0x0200 | |
112 | #define L2TP_HDRFLAG_P 0x0100 | |
113 | ||
114 | #define L2TP_HDR_VER_MASK 0x000F | |
115 | #define L2TP_HDR_VER 0x0002 | |
116 | ||
117 | /* Space for UDP, L2TP and PPP headers */ | |
118 | #define PPPOL2TP_HEADER_OVERHEAD 40 | |
119 | ||
120 | /* Just some random numbers */ | |
121 | #define L2TP_TUNNEL_MAGIC 0x42114DDA | |
122 | #define L2TP_SESSION_MAGIC 0x0C04EB7D | |
123 | ||
124 | #define PPPOL2TP_HASH_BITS 4 | |
125 | #define PPPOL2TP_HASH_SIZE (1 << PPPOL2TP_HASH_BITS) | |
126 | ||
127 | /* Default trace flags */ | |
128 | #define PPPOL2TP_DEFAULT_DEBUG_FLAGS 0 | |
129 | ||
130 | #define PRINTK(_mask, _type, _lvl, _fmt, args...) \ | |
131 | do { \ | |
132 | if ((_mask) & (_type)) \ | |
133 | printk(_lvl "PPPOL2TP: " _fmt, ##args); \ | |
134 | } while(0) | |
135 | ||
136 | /* Number of bytes to build transmit L2TP headers. | |
137 | * Unfortunately the size is different depending on whether sequence numbers | |
138 | * are enabled. | |
139 | */ | |
140 | #define PPPOL2TP_L2TP_HDR_SIZE_SEQ 10 | |
141 | #define PPPOL2TP_L2TP_HDR_SIZE_NOSEQ 6 | |
142 | ||
143 | struct pppol2tp_tunnel; | |
144 | ||
145 | /* Describes a session. It is the sk_user_data field in the PPPoL2TP | |
146 | * socket. Contains information to determine incoming packets and transmit | |
147 | * outgoing ones. | |
148 | */ | |
149 | struct pppol2tp_session | |
150 | { | |
151 | int magic; /* should be | |
152 | * L2TP_SESSION_MAGIC */ | |
153 | int owner; /* pid that opened the socket */ | |
154 | ||
155 | struct sock *sock; /* Pointer to the session | |
156 | * PPPoX socket */ | |
157 | struct sock *tunnel_sock; /* Pointer to the tunnel UDP | |
158 | * socket */ | |
159 | ||
160 | struct pppol2tp_addr tunnel_addr; /* Description of tunnel */ | |
161 | ||
162 | struct pppol2tp_tunnel *tunnel; /* back pointer to tunnel | |
163 | * context */ | |
164 | ||
165 | char name[20]; /* "sess xxxxx/yyyyy", where | |
166 | * x=tunnel_id, y=session_id */ | |
167 | int mtu; | |
168 | int mru; | |
169 | int flags; /* accessed by PPPIOCGFLAGS. | |
170 | * Unused. */ | |
171 | unsigned recv_seq:1; /* expect receive packets with | |
172 | * sequence numbers? */ | |
173 | unsigned send_seq:1; /* send packets with sequence | |
174 | * numbers? */ | |
175 | unsigned lns_mode:1; /* behave as LNS? LAC enables | |
176 | * sequence numbers under | |
177 | * control of LNS. */ | |
178 | int debug; /* bitmask of debug message | |
179 | * categories */ | |
180 | int reorder_timeout; /* configured reorder timeout | |
181 | * (in jiffies) */ | |
182 | u16 nr; /* session NR state (receive) */ | |
183 | u16 ns; /* session NR state (send) */ | |
184 | struct sk_buff_head reorder_q; /* receive reorder queue */ | |
185 | struct pppol2tp_ioc_stats stats; | |
186 | struct hlist_node hlist; /* Hash list node */ | |
187 | }; | |
188 | ||
189 | /* The sk_user_data field of the tunnel's UDP socket. It contains info to track | |
190 | * all the associated sessions so incoming packets can be sorted out | |
191 | */ | |
192 | struct pppol2tp_tunnel | |
193 | { | |
194 | int magic; /* Should be L2TP_TUNNEL_MAGIC */ | |
195 | rwlock_t hlist_lock; /* protect session_hlist */ | |
196 | struct hlist_head session_hlist[PPPOL2TP_HASH_SIZE]; | |
197 | /* hashed list of sessions, | |
198 | * hashed by id */ | |
199 | int debug; /* bitmask of debug message | |
200 | * categories */ | |
201 | char name[12]; /* "tunl xxxxx" */ | |
202 | struct pppol2tp_ioc_stats stats; | |
203 | ||
204 | void (*old_sk_destruct)(struct sock *); | |
205 | ||
206 | struct sock *sock; /* Parent socket */ | |
207 | struct list_head list; /* Keep a list of all open | |
208 | * prepared sockets */ | |
4e9fb801 | 209 | struct net *pppol2tp_net; /* the net we belong to */ |
3557baab JC |
210 | |
211 | atomic_t ref_count; | |
212 | }; | |
213 | ||
214 | /* Private data stored for received packets in the skb. | |
215 | */ | |
216 | struct pppol2tp_skb_cb { | |
217 | u16 ns; | |
218 | u16 nr; | |
219 | u16 has_seq; | |
220 | u16 length; | |
221 | unsigned long expires; | |
222 | }; | |
223 | ||
224 | #define PPPOL2TP_SKB_CB(skb) ((struct pppol2tp_skb_cb *) &skb->cb[sizeof(struct inet_skb_parm)]) | |
225 | ||
226 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
227 | static void pppol2tp_tunnel_free(struct pppol2tp_tunnel *tunnel); | |
228 | ||
229 | static atomic_t pppol2tp_tunnel_count; | |
230 | static atomic_t pppol2tp_session_count; | |
231 | static struct ppp_channel_ops pppol2tp_chan_ops = { pppol2tp_xmit , NULL }; | |
232 | static struct proto_ops pppol2tp_ops; | |
4e9fb801 CG |
233 | |
234 | /* per-net private data for this module */ | |
d6781f2a | 235 | static int pppol2tp_net_id; |
4e9fb801 CG |
236 | struct pppol2tp_net { |
237 | struct list_head pppol2tp_tunnel_list; | |
238 | rwlock_t pppol2tp_tunnel_list_lock; | |
239 | }; | |
240 | ||
241 | static inline struct pppol2tp_net *pppol2tp_pernet(struct net *net) | |
242 | { | |
243 | BUG_ON(!net); | |
244 | ||
245 | return net_generic(net, pppol2tp_net_id); | |
246 | } | |
3557baab JC |
247 | |
248 | /* Helpers to obtain tunnel/session contexts from sockets. | |
249 | */ | |
250 | static inline struct pppol2tp_session *pppol2tp_sock_to_session(struct sock *sk) | |
251 | { | |
252 | struct pppol2tp_session *session; | |
253 | ||
254 | if (sk == NULL) | |
255 | return NULL; | |
256 | ||
24b95685 | 257 | sock_hold(sk); |
3557baab | 258 | session = (struct pppol2tp_session *)(sk->sk_user_data); |
24b95685 JC |
259 | if (session == NULL) { |
260 | sock_put(sk); | |
261 | goto out; | |
262 | } | |
3557baab JC |
263 | |
264 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); | |
24b95685 | 265 | out: |
3557baab JC |
266 | return session; |
267 | } | |
268 | ||
269 | static inline struct pppol2tp_tunnel *pppol2tp_sock_to_tunnel(struct sock *sk) | |
270 | { | |
271 | struct pppol2tp_tunnel *tunnel; | |
272 | ||
273 | if (sk == NULL) | |
274 | return NULL; | |
275 | ||
24b95685 | 276 | sock_hold(sk); |
3557baab | 277 | tunnel = (struct pppol2tp_tunnel *)(sk->sk_user_data); |
24b95685 JC |
278 | if (tunnel == NULL) { |
279 | sock_put(sk); | |
280 | goto out; | |
281 | } | |
3557baab JC |
282 | |
283 | BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC); | |
24b95685 | 284 | out: |
3557baab JC |
285 | return tunnel; |
286 | } | |
287 | ||
288 | /* Tunnel reference counts. Incremented per session that is added to | |
289 | * the tunnel. | |
290 | */ | |
291 | static inline void pppol2tp_tunnel_inc_refcount(struct pppol2tp_tunnel *tunnel) | |
292 | { | |
293 | atomic_inc(&tunnel->ref_count); | |
294 | } | |
295 | ||
296 | static inline void pppol2tp_tunnel_dec_refcount(struct pppol2tp_tunnel *tunnel) | |
297 | { | |
298 | if (atomic_dec_and_test(&tunnel->ref_count)) | |
299 | pppol2tp_tunnel_free(tunnel); | |
300 | } | |
301 | ||
302 | /* Session hash list. | |
303 | * The session_id SHOULD be random according to RFC2661, but several | |
304 | * L2TP implementations (Cisco and Microsoft) use incrementing | |
305 | * session_ids. So we do a real hash on the session_id, rather than a | |
306 | * simple bitmask. | |
307 | */ | |
308 | static inline struct hlist_head * | |
309 | pppol2tp_session_id_hash(struct pppol2tp_tunnel *tunnel, u16 session_id) | |
310 | { | |
311 | unsigned long hash_val = (unsigned long) session_id; | |
312 | return &tunnel->session_hlist[hash_long(hash_val, PPPOL2TP_HASH_BITS)]; | |
313 | } | |
314 | ||
315 | /* Lookup a session by id | |
316 | */ | |
317 | static struct pppol2tp_session * | |
318 | pppol2tp_session_find(struct pppol2tp_tunnel *tunnel, u16 session_id) | |
319 | { | |
320 | struct hlist_head *session_list = | |
321 | pppol2tp_session_id_hash(tunnel, session_id); | |
322 | struct pppol2tp_session *session; | |
323 | struct hlist_node *walk; | |
324 | ||
cf3752e2 | 325 | read_lock_bh(&tunnel->hlist_lock); |
3557baab JC |
326 | hlist_for_each_entry(session, walk, session_list, hlist) { |
327 | if (session->tunnel_addr.s_session == session_id) { | |
cf3752e2 | 328 | read_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
329 | return session; |
330 | } | |
331 | } | |
cf3752e2 | 332 | read_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
333 | |
334 | return NULL; | |
335 | } | |
336 | ||
337 | /* Lookup a tunnel by id | |
338 | */ | |
4e9fb801 | 339 | static struct pppol2tp_tunnel *pppol2tp_tunnel_find(struct net *net, u16 tunnel_id) |
3557baab | 340 | { |
4e9fb801 CG |
341 | struct pppol2tp_tunnel *tunnel; |
342 | struct pppol2tp_net *pn = pppol2tp_pernet(net); | |
3557baab | 343 | |
4e9fb801 CG |
344 | read_lock_bh(&pn->pppol2tp_tunnel_list_lock); |
345 | list_for_each_entry(tunnel, &pn->pppol2tp_tunnel_list, list) { | |
3557baab | 346 | if (tunnel->stats.tunnel_id == tunnel_id) { |
4e9fb801 | 347 | read_unlock_bh(&pn->pppol2tp_tunnel_list_lock); |
3557baab JC |
348 | return tunnel; |
349 | } | |
350 | } | |
4e9fb801 | 351 | read_unlock_bh(&pn->pppol2tp_tunnel_list_lock); |
3557baab JC |
352 | |
353 | return NULL; | |
354 | } | |
355 | ||
356 | /***************************************************************************** | |
357 | * Receive data handling | |
358 | *****************************************************************************/ | |
359 | ||
360 | /* Queue a skb in order. We come here only if the skb has an L2TP sequence | |
361 | * number. | |
362 | */ | |
363 | static void pppol2tp_recv_queue_skb(struct pppol2tp_session *session, struct sk_buff *skb) | |
364 | { | |
365 | struct sk_buff *skbp; | |
e653181d | 366 | struct sk_buff *tmp; |
3557baab JC |
367 | u16 ns = PPPOL2TP_SKB_CB(skb)->ns; |
368 | ||
cf3752e2 | 369 | spin_lock_bh(&session->reorder_q.lock); |
e653181d | 370 | skb_queue_walk_safe(&session->reorder_q, skbp, tmp) { |
3557baab | 371 | if (PPPOL2TP_SKB_CB(skbp)->ns > ns) { |
43f59c89 | 372 | __skb_queue_before(&session->reorder_q, skbp, skb); |
3557baab JC |
373 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, |
374 | "%s: pkt %hu, inserted before %hu, reorder_q len=%d\n", | |
375 | session->name, ns, PPPOL2TP_SKB_CB(skbp)->ns, | |
376 | skb_queue_len(&session->reorder_q)); | |
377 | session->stats.rx_oos_packets++; | |
378 | goto out; | |
379 | } | |
380 | } | |
381 | ||
382 | __skb_queue_tail(&session->reorder_q, skb); | |
383 | ||
384 | out: | |
cf3752e2 | 385 | spin_unlock_bh(&session->reorder_q.lock); |
3557baab JC |
386 | } |
387 | ||
388 | /* Dequeue a single skb. | |
389 | */ | |
390 | static void pppol2tp_recv_dequeue_skb(struct pppol2tp_session *session, struct sk_buff *skb) | |
391 | { | |
392 | struct pppol2tp_tunnel *tunnel = session->tunnel; | |
393 | int length = PPPOL2TP_SKB_CB(skb)->length; | |
394 | struct sock *session_sock = NULL; | |
395 | ||
e653181d | 396 | /* We're about to requeue the skb, so return resources |
3557baab JC |
397 | * to its current owner (a socket receive buffer). |
398 | */ | |
3557baab JC |
399 | skb_orphan(skb); |
400 | ||
401 | tunnel->stats.rx_packets++; | |
402 | tunnel->stats.rx_bytes += length; | |
403 | session->stats.rx_packets++; | |
404 | session->stats.rx_bytes += length; | |
405 | ||
406 | if (PPPOL2TP_SKB_CB(skb)->has_seq) { | |
407 | /* Bump our Nr */ | |
408 | session->nr++; | |
409 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, | |
410 | "%s: updated nr to %hu\n", session->name, session->nr); | |
411 | } | |
412 | ||
413 | /* If the socket is bound, send it in to PPP's input queue. Otherwise | |
414 | * queue it on the session socket. | |
415 | */ | |
416 | session_sock = session->sock; | |
417 | if (session_sock->sk_state & PPPOX_BOUND) { | |
418 | struct pppox_sock *po; | |
419 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
420 | "%s: recv %d byte data frame, passing to ppp\n", | |
421 | session->name, length); | |
422 | ||
423 | /* We need to forget all info related to the L2TP packet | |
424 | * gathered in the skb as we are going to reuse the same | |
425 | * skb for the inner packet. | |
426 | * Namely we need to: | |
427 | * - reset xfrm (IPSec) information as it applies to | |
428 | * the outer L2TP packet and not to the inner one | |
429 | * - release the dst to force a route lookup on the inner | |
430 | * IP packet since skb->dst currently points to the dst | |
431 | * of the UDP tunnel | |
432 | * - reset netfilter information as it doesn't apply | |
433 | * to the inner packet either | |
434 | */ | |
435 | secpath_reset(skb); | |
adf30907 | 436 | skb_dst_drop(skb); |
3557baab JC |
437 | nf_reset(skb); |
438 | ||
439 | po = pppox_sk(session_sock); | |
440 | ppp_input(&po->chan, skb); | |
441 | } else { | |
442 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_INFO, | |
443 | "%s: socket not bound\n", session->name); | |
444 | ||
445 | /* Not bound. Nothing we can do, so discard. */ | |
446 | session->stats.rx_errors++; | |
447 | kfree_skb(skb); | |
448 | } | |
449 | ||
450 | sock_put(session->sock); | |
451 | } | |
452 | ||
453 | /* Dequeue skbs from the session's reorder_q, subject to packet order. | |
454 | * Skbs that have been in the queue for too long are simply discarded. | |
455 | */ | |
456 | static void pppol2tp_recv_dequeue(struct pppol2tp_session *session) | |
457 | { | |
458 | struct sk_buff *skb; | |
459 | struct sk_buff *tmp; | |
460 | ||
461 | /* If the pkt at the head of the queue has the nr that we | |
462 | * expect to send up next, dequeue it and any other | |
463 | * in-sequence packets behind it. | |
464 | */ | |
cf3752e2 | 465 | spin_lock_bh(&session->reorder_q.lock); |
3557baab JC |
466 | skb_queue_walk_safe(&session->reorder_q, skb, tmp) { |
467 | if (time_after(jiffies, PPPOL2TP_SKB_CB(skb)->expires)) { | |
468 | session->stats.rx_seq_discards++; | |
469 | session->stats.rx_errors++; | |
470 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, | |
471 | "%s: oos pkt %hu len %d discarded (too old), " | |
472 | "waiting for %hu, reorder_q_len=%d\n", | |
473 | session->name, PPPOL2TP_SKB_CB(skb)->ns, | |
474 | PPPOL2TP_SKB_CB(skb)->length, session->nr, | |
475 | skb_queue_len(&session->reorder_q)); | |
476 | __skb_unlink(skb, &session->reorder_q); | |
477 | kfree_skb(skb); | |
c8fff1cf | 478 | sock_put(session->sock); |
3557baab JC |
479 | continue; |
480 | } | |
481 | ||
482 | if (PPPOL2TP_SKB_CB(skb)->has_seq) { | |
483 | if (PPPOL2TP_SKB_CB(skb)->ns != session->nr) { | |
484 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, | |
485 | "%s: holding oos pkt %hu len %d, " | |
486 | "waiting for %hu, reorder_q_len=%d\n", | |
487 | session->name, PPPOL2TP_SKB_CB(skb)->ns, | |
488 | PPPOL2TP_SKB_CB(skb)->length, session->nr, | |
489 | skb_queue_len(&session->reorder_q)); | |
490 | goto out; | |
491 | } | |
492 | } | |
e653181d JC |
493 | __skb_unlink(skb, &session->reorder_q); |
494 | ||
495 | /* Process the skb. We release the queue lock while we | |
496 | * do so to let other contexts process the queue. | |
497 | */ | |
cf3752e2 | 498 | spin_unlock_bh(&session->reorder_q.lock); |
3557baab | 499 | pppol2tp_recv_dequeue_skb(session, skb); |
cf3752e2 | 500 | spin_lock_bh(&session->reorder_q.lock); |
3557baab JC |
501 | } |
502 | ||
503 | out: | |
cf3752e2 | 504 | spin_unlock_bh(&session->reorder_q.lock); |
3557baab JC |
505 | } |
506 | ||
ffcebb16 JC |
507 | static inline int pppol2tp_verify_udp_checksum(struct sock *sk, |
508 | struct sk_buff *skb) | |
509 | { | |
510 | struct udphdr *uh = udp_hdr(skb); | |
511 | u16 ulen = ntohs(uh->len); | |
512 | struct inet_sock *inet; | |
513 | __wsum psum; | |
514 | ||
515 | if (sk->sk_no_check || skb_csum_unnecessary(skb) || !uh->check) | |
516 | return 0; | |
517 | ||
518 | inet = inet_sk(sk); | |
519 | psum = csum_tcpudp_nofold(inet->saddr, inet->daddr, ulen, | |
520 | IPPROTO_UDP, 0); | |
521 | ||
522 | if ((skb->ip_summed == CHECKSUM_COMPLETE) && | |
523 | !csum_fold(csum_add(psum, skb->csum))) | |
524 | return 0; | |
525 | ||
526 | skb->csum = psum; | |
527 | ||
528 | return __skb_checksum_complete(skb); | |
529 | } | |
530 | ||
3557baab JC |
531 | /* Internal receive frame. Do the real work of receiving an L2TP data frame |
532 | * here. The skb is not on a list when we get here. | |
533 | * Returns 0 if the packet was a data packet and was successfully passed on. | |
534 | * Returns 1 if the packet was not a good data packet and could not be | |
535 | * forwarded. All such packets are passed up to userspace to deal with. | |
536 | */ | |
537 | static int pppol2tp_recv_core(struct sock *sock, struct sk_buff *skb) | |
538 | { | |
539 | struct pppol2tp_session *session = NULL; | |
540 | struct pppol2tp_tunnel *tunnel; | |
91781004 | 541 | unsigned char *ptr, *optr; |
3557baab JC |
542 | u16 hdrflags; |
543 | u16 tunnel_id, session_id; | |
544 | int length; | |
7a70e39b | 545 | int offset; |
3557baab JC |
546 | |
547 | tunnel = pppol2tp_sock_to_tunnel(sock); | |
548 | if (tunnel == NULL) | |
91781004 | 549 | goto no_tunnel; |
3557baab | 550 | |
ffcebb16 JC |
551 | if (tunnel->sock && pppol2tp_verify_udp_checksum(tunnel->sock, skb)) |
552 | goto discard_bad_csum; | |
553 | ||
7a70e39b HX |
554 | /* UDP always verifies the packet length. */ |
555 | __skb_pull(skb, sizeof(struct udphdr)); | |
556 | ||
3557baab | 557 | /* Short packet? */ |
7a70e39b | 558 | if (!pskb_may_pull(skb, 12)) { |
3557baab JC |
559 | PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_INFO, |
560 | "%s: recv short packet (len=%d)\n", tunnel->name, skb->len); | |
561 | goto error; | |
562 | } | |
563 | ||
564 | /* Point to L2TP header */ | |
91781004 | 565 | optr = ptr = skb->data; |
3557baab JC |
566 | |
567 | /* Get L2TP header flags */ | |
568 | hdrflags = ntohs(*(__be16*)ptr); | |
569 | ||
570 | /* Trace packet contents, if enabled */ | |
571 | if (tunnel->debug & PPPOL2TP_MSG_DATA) { | |
7a70e39b HX |
572 | length = min(16u, skb->len); |
573 | if (!pskb_may_pull(skb, length)) | |
574 | goto error; | |
575 | ||
3557baab JC |
576 | printk(KERN_DEBUG "%s: recv: ", tunnel->name); |
577 | ||
7a70e39b HX |
578 | offset = 0; |
579 | do { | |
580 | printk(" %02X", ptr[offset]); | |
581 | } while (++offset < length); | |
582 | ||
3557baab JC |
583 | printk("\n"); |
584 | } | |
585 | ||
586 | /* Get length of L2TP packet */ | |
7a70e39b | 587 | length = skb->len; |
3557baab JC |
588 | |
589 | /* If type is control packet, it is handled by userspace. */ | |
590 | if (hdrflags & L2TP_HDRFLAG_T) { | |
591 | PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
592 | "%s: recv control packet, len=%d\n", tunnel->name, length); | |
593 | goto error; | |
594 | } | |
595 | ||
596 | /* Skip flags */ | |
597 | ptr += 2; | |
598 | ||
599 | /* If length is present, skip it */ | |
600 | if (hdrflags & L2TP_HDRFLAG_L) | |
601 | ptr += 2; | |
602 | ||
603 | /* Extract tunnel and session ID */ | |
604 | tunnel_id = ntohs(*(__be16 *) ptr); | |
605 | ptr += 2; | |
606 | session_id = ntohs(*(__be16 *) ptr); | |
607 | ptr += 2; | |
608 | ||
609 | /* Find the session context */ | |
610 | session = pppol2tp_session_find(tunnel, session_id); | |
611 | if (!session) { | |
612 | /* Not found? Pass to userspace to deal with */ | |
613 | PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_INFO, | |
614 | "%s: no socket found (%hu/%hu). Passing up.\n", | |
615 | tunnel->name, tunnel_id, session_id); | |
616 | goto error; | |
617 | } | |
618 | sock_hold(session->sock); | |
619 | ||
620 | /* The ref count on the socket was increased by the above call since | |
621 | * we now hold a pointer to the session. Take care to do sock_put() | |
622 | * when exiting this function from now on... | |
623 | */ | |
624 | ||
625 | /* Handle the optional sequence numbers. If we are the LAC, | |
626 | * enable/disable sequence numbers under the control of the LNS. If | |
627 | * no sequence numbers present but we were expecting them, discard | |
628 | * frame. | |
629 | */ | |
630 | if (hdrflags & L2TP_HDRFLAG_S) { | |
631 | u16 ns, nr; | |
632 | ns = ntohs(*(__be16 *) ptr); | |
633 | ptr += 2; | |
634 | nr = ntohs(*(__be16 *) ptr); | |
635 | ptr += 2; | |
636 | ||
637 | /* Received a packet with sequence numbers. If we're the LNS, | |
638 | * check if we sre sending sequence numbers and if not, | |
639 | * configure it so. | |
640 | */ | |
641 | if ((!session->lns_mode) && (!session->send_seq)) { | |
642 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_INFO, | |
643 | "%s: requested to enable seq numbers by LNS\n", | |
644 | session->name); | |
645 | session->send_seq = -1; | |
646 | } | |
647 | ||
648 | /* Store L2TP info in the skb */ | |
649 | PPPOL2TP_SKB_CB(skb)->ns = ns; | |
650 | PPPOL2TP_SKB_CB(skb)->nr = nr; | |
651 | PPPOL2TP_SKB_CB(skb)->has_seq = 1; | |
652 | ||
653 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, | |
654 | "%s: recv data ns=%hu, nr=%hu, session nr=%hu\n", | |
655 | session->name, ns, nr, session->nr); | |
656 | } else { | |
657 | /* No sequence numbers. | |
658 | * If user has configured mandatory sequence numbers, discard. | |
659 | */ | |
660 | if (session->recv_seq) { | |
661 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_WARNING, | |
662 | "%s: recv data has no seq numbers when required. " | |
663 | "Discarding\n", session->name); | |
664 | session->stats.rx_seq_discards++; | |
3557baab JC |
665 | goto discard; |
666 | } | |
667 | ||
668 | /* If we're the LAC and we're sending sequence numbers, the | |
669 | * LNS has requested that we no longer send sequence numbers. | |
670 | * If we're the LNS and we're sending sequence numbers, the | |
671 | * LAC is broken. Discard the frame. | |
672 | */ | |
673 | if ((!session->lns_mode) && (session->send_seq)) { | |
674 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_INFO, | |
675 | "%s: requested to disable seq numbers by LNS\n", | |
676 | session->name); | |
677 | session->send_seq = 0; | |
678 | } else if (session->send_seq) { | |
679 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_WARNING, | |
680 | "%s: recv data has no seq numbers when required. " | |
681 | "Discarding\n", session->name); | |
682 | session->stats.rx_seq_discards++; | |
3557baab JC |
683 | goto discard; |
684 | } | |
685 | ||
686 | /* Store L2TP info in the skb */ | |
687 | PPPOL2TP_SKB_CB(skb)->has_seq = 0; | |
688 | } | |
689 | ||
690 | /* If offset bit set, skip it. */ | |
7a70e39b HX |
691 | if (hdrflags & L2TP_HDRFLAG_O) { |
692 | offset = ntohs(*(__be16 *)ptr); | |
91781004 | 693 | ptr += 2 + offset; |
7a70e39b | 694 | } |
3557baab | 695 | |
91781004 JC |
696 | offset = ptr - optr; |
697 | if (!pskb_may_pull(skb, offset)) | |
698 | goto discard; | |
699 | ||
700 | __skb_pull(skb, offset); | |
3557baab JC |
701 | |
702 | /* Skip PPP header, if present. In testing, Microsoft L2TP clients | |
703 | * don't send the PPP header (PPP header compression enabled), but | |
704 | * other clients can include the header. So we cope with both cases | |
705 | * here. The PPP header is always FF03 when using L2TP. | |
706 | * | |
707 | * Note that skb->data[] isn't dereferenced from a u16 ptr here since | |
708 | * the field may be unaligned. | |
709 | */ | |
91781004 JC |
710 | if (!pskb_may_pull(skb, 2)) |
711 | goto discard; | |
712 | ||
3557baab JC |
713 | if ((skb->data[0] == 0xff) && (skb->data[1] == 0x03)) |
714 | skb_pull(skb, 2); | |
715 | ||
716 | /* Prepare skb for adding to the session's reorder_q. Hold | |
717 | * packets for max reorder_timeout or 1 second if not | |
718 | * reordering. | |
719 | */ | |
720 | PPPOL2TP_SKB_CB(skb)->length = length; | |
721 | PPPOL2TP_SKB_CB(skb)->expires = jiffies + | |
722 | (session->reorder_timeout ? session->reorder_timeout : HZ); | |
723 | ||
724 | /* Add packet to the session's receive queue. Reordering is done here, if | |
725 | * enabled. Saved L2TP protocol info is stored in skb->sb[]. | |
726 | */ | |
727 | if (PPPOL2TP_SKB_CB(skb)->has_seq) { | |
728 | if (session->reorder_timeout != 0) { | |
729 | /* Packet reordering enabled. Add skb to session's | |
730 | * reorder queue, in order of ns. | |
731 | */ | |
732 | pppol2tp_recv_queue_skb(session, skb); | |
733 | } else { | |
734 | /* Packet reordering disabled. Discard out-of-sequence | |
735 | * packets | |
736 | */ | |
737 | if (PPPOL2TP_SKB_CB(skb)->ns != session->nr) { | |
738 | session->stats.rx_seq_discards++; | |
3557baab JC |
739 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, |
740 | "%s: oos pkt %hu len %d discarded, " | |
741 | "waiting for %hu, reorder_q_len=%d\n", | |
742 | session->name, PPPOL2TP_SKB_CB(skb)->ns, | |
743 | PPPOL2TP_SKB_CB(skb)->length, session->nr, | |
744 | skb_queue_len(&session->reorder_q)); | |
745 | goto discard; | |
746 | } | |
747 | skb_queue_tail(&session->reorder_q, skb); | |
748 | } | |
749 | } else { | |
750 | /* No sequence numbers. Add the skb to the tail of the | |
751 | * reorder queue. This ensures that it will be | |
752 | * delivered after all previous sequenced skbs. | |
753 | */ | |
754 | skb_queue_tail(&session->reorder_q, skb); | |
755 | } | |
756 | ||
757 | /* Try to dequeue as many skbs from reorder_q as we can. */ | |
758 | pppol2tp_recv_dequeue(session); | |
759 | ||
760 | return 0; | |
761 | ||
762 | discard: | |
7a70e39b | 763 | session->stats.rx_errors++; |
3557baab JC |
764 | kfree_skb(skb); |
765 | sock_put(session->sock); | |
24b95685 | 766 | sock_put(sock); |
3557baab JC |
767 | |
768 | return 0; | |
769 | ||
ffcebb16 JC |
770 | discard_bad_csum: |
771 | LIMIT_NETDEBUG("%s: UDP: bad checksum\n", tunnel->name); | |
772 | UDP_INC_STATS_USER(&init_net, UDP_MIB_INERRORS, 0); | |
773 | tunnel->stats.rx_errors++; | |
774 | kfree_skb(skb); | |
775 | ||
776 | return 0; | |
777 | ||
3557baab | 778 | error: |
91781004 JC |
779 | /* Put UDP header back */ |
780 | __skb_push(skb, sizeof(struct udphdr)); | |
24b95685 | 781 | sock_put(sock); |
91781004 JC |
782 | |
783 | no_tunnel: | |
3557baab JC |
784 | return 1; |
785 | } | |
786 | ||
787 | /* UDP encapsulation receive handler. See net/ipv4/udp.c. | |
788 | * Return codes: | |
789 | * 0 : success. | |
790 | * <0: error | |
791 | * >0: skb should be passed up to userspace as UDP. | |
792 | */ | |
793 | static int pppol2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
794 | { | |
795 | struct pppol2tp_tunnel *tunnel; | |
796 | ||
797 | tunnel = pppol2tp_sock_to_tunnel(sk); | |
798 | if (tunnel == NULL) | |
799 | goto pass_up; | |
800 | ||
801 | PRINTK(tunnel->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
802 | "%s: received %d bytes\n", tunnel->name, skb->len); | |
803 | ||
804 | if (pppol2tp_recv_core(sk, skb)) | |
24b95685 | 805 | goto pass_up_put; |
3557baab | 806 | |
24b95685 | 807 | sock_put(sk); |
3557baab JC |
808 | return 0; |
809 | ||
24b95685 JC |
810 | pass_up_put: |
811 | sock_put(sk); | |
3557baab JC |
812 | pass_up: |
813 | return 1; | |
814 | } | |
815 | ||
816 | /* Receive message. This is the recvmsg for the PPPoL2TP socket. | |
817 | */ | |
818 | static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock, | |
819 | struct msghdr *msg, size_t len, | |
820 | int flags) | |
821 | { | |
822 | int err; | |
823 | struct sk_buff *skb; | |
824 | struct sock *sk = sock->sk; | |
825 | ||
826 | err = -EIO; | |
827 | if (sk->sk_state & PPPOX_BOUND) | |
828 | goto end; | |
829 | ||
830 | msg->msg_namelen = 0; | |
831 | ||
832 | err = 0; | |
833 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
834 | flags & MSG_DONTWAIT, &err); | |
6b6707a5 JC |
835 | if (!skb) |
836 | goto end; | |
837 | ||
838 | if (len > skb->len) | |
839 | len = skb->len; | |
840 | else if (len < skb->len) | |
841 | msg->msg_flags |= MSG_TRUNC; | |
842 | ||
843 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len); | |
844 | if (likely(err == 0)) | |
845 | err = len; | |
846 | ||
3557baab JC |
847 | kfree_skb(skb); |
848 | end: | |
849 | return err; | |
850 | } | |
851 | ||
852 | /************************************************************************ | |
853 | * Transmit handling | |
854 | ***********************************************************************/ | |
855 | ||
856 | /* Tell how big L2TP headers are for a particular session. This | |
857 | * depends on whether sequence numbers are being used. | |
858 | */ | |
859 | static inline int pppol2tp_l2tp_header_len(struct pppol2tp_session *session) | |
860 | { | |
861 | if (session->send_seq) | |
862 | return PPPOL2TP_L2TP_HDR_SIZE_SEQ; | |
863 | ||
864 | return PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
865 | } | |
866 | ||
867 | /* Build an L2TP header for the session into the buffer provided. | |
868 | */ | |
869 | static void pppol2tp_build_l2tp_header(struct pppol2tp_session *session, | |
870 | void *buf) | |
871 | { | |
872 | __be16 *bufp = buf; | |
873 | u16 flags = L2TP_HDR_VER; | |
874 | ||
875 | if (session->send_seq) | |
876 | flags |= L2TP_HDRFLAG_S; | |
877 | ||
878 | /* Setup L2TP header. | |
879 | * FIXME: Can this ever be unaligned? Is direct dereferencing of | |
880 | * 16-bit header fields safe here for all architectures? | |
881 | */ | |
882 | *bufp++ = htons(flags); | |
883 | *bufp++ = htons(session->tunnel_addr.d_tunnel); | |
884 | *bufp++ = htons(session->tunnel_addr.d_session); | |
885 | if (session->send_seq) { | |
886 | *bufp++ = htons(session->ns); | |
887 | *bufp++ = 0; | |
888 | session->ns++; | |
889 | PRINTK(session->debug, PPPOL2TP_MSG_SEQ, KERN_DEBUG, | |
890 | "%s: updated ns to %hu\n", session->name, session->ns); | |
891 | } | |
892 | } | |
893 | ||
894 | /* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here | |
895 | * when a user application does a sendmsg() on the session socket. L2TP and | |
896 | * PPP headers must be inserted into the user's data. | |
897 | */ | |
898 | static int pppol2tp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
899 | size_t total_len) | |
900 | { | |
901 | static const unsigned char ppph[2] = { 0xff, 0x03 }; | |
902 | struct sock *sk = sock->sk; | |
903 | struct inet_sock *inet; | |
ffcebb16 | 904 | __wsum csum; |
3557baab JC |
905 | struct sk_buff *skb; |
906 | int error; | |
907 | int hdr_len; | |
908 | struct pppol2tp_session *session; | |
909 | struct pppol2tp_tunnel *tunnel; | |
910 | struct udphdr *uh; | |
7d4372b5 | 911 | unsigned int len; |
ffcebb16 JC |
912 | struct sock *sk_tun; |
913 | u16 udp_len; | |
3557baab JC |
914 | |
915 | error = -ENOTCONN; | |
916 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
917 | goto error; | |
918 | ||
919 | /* Get session and tunnel contexts */ | |
920 | error = -EBADF; | |
921 | session = pppol2tp_sock_to_session(sk); | |
922 | if (session == NULL) | |
923 | goto error; | |
924 | ||
ffcebb16 JC |
925 | sk_tun = session->tunnel_sock; |
926 | tunnel = pppol2tp_sock_to_tunnel(sk_tun); | |
3557baab | 927 | if (tunnel == NULL) |
24b95685 | 928 | goto error_put_sess; |
3557baab JC |
929 | |
930 | /* What header length is configured for this session? */ | |
931 | hdr_len = pppol2tp_l2tp_header_len(session); | |
932 | ||
933 | /* Allocate a socket buffer */ | |
934 | error = -ENOMEM; | |
935 | skb = sock_wmalloc(sk, NET_SKB_PAD + sizeof(struct iphdr) + | |
936 | sizeof(struct udphdr) + hdr_len + | |
937 | sizeof(ppph) + total_len, | |
938 | 0, GFP_KERNEL); | |
939 | if (!skb) | |
24b95685 | 940 | goto error_put_sess_tun; |
3557baab JC |
941 | |
942 | /* Reserve space for headers. */ | |
943 | skb_reserve(skb, NET_SKB_PAD); | |
944 | skb_reset_network_header(skb); | |
945 | skb_reserve(skb, sizeof(struct iphdr)); | |
946 | skb_reset_transport_header(skb); | |
947 | ||
948 | /* Build UDP header */ | |
ffcebb16 JC |
949 | inet = inet_sk(sk_tun); |
950 | udp_len = hdr_len + sizeof(ppph) + total_len; | |
3557baab JC |
951 | uh = (struct udphdr *) skb->data; |
952 | uh->source = inet->sport; | |
953 | uh->dest = inet->dport; | |
ffcebb16 | 954 | uh->len = htons(udp_len); |
3557baab JC |
955 | uh->check = 0; |
956 | skb_put(skb, sizeof(struct udphdr)); | |
957 | ||
958 | /* Build L2TP header */ | |
959 | pppol2tp_build_l2tp_header(session, skb->data); | |
960 | skb_put(skb, hdr_len); | |
961 | ||
962 | /* Add PPP header */ | |
963 | skb->data[0] = ppph[0]; | |
964 | skb->data[1] = ppph[1]; | |
965 | skb_put(skb, 2); | |
966 | ||
967 | /* Copy user data into skb */ | |
968 | error = memcpy_fromiovec(skb->data, m->msg_iov, total_len); | |
969 | if (error < 0) { | |
970 | kfree_skb(skb); | |
24b95685 | 971 | goto error_put_sess_tun; |
3557baab JC |
972 | } |
973 | skb_put(skb, total_len); | |
974 | ||
975 | /* Calculate UDP checksum if configured to do so */ | |
ffcebb16 JC |
976 | if (sk_tun->sk_no_check == UDP_CSUM_NOXMIT) |
977 | skb->ip_summed = CHECKSUM_NONE; | |
adf30907 | 978 | else if (!(skb_dst(skb)->dev->features & NETIF_F_V4_CSUM)) { |
ffcebb16 JC |
979 | skb->ip_summed = CHECKSUM_COMPLETE; |
980 | csum = skb_checksum(skb, 0, udp_len, 0); | |
981 | uh->check = csum_tcpudp_magic(inet->saddr, inet->daddr, | |
982 | udp_len, IPPROTO_UDP, csum); | |
983 | if (uh->check == 0) | |
984 | uh->check = CSUM_MANGLED_0; | |
985 | } else { | |
986 | skb->ip_summed = CHECKSUM_PARTIAL; | |
987 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
988 | skb->csum_offset = offsetof(struct udphdr, check); | |
989 | uh->check = ~csum_tcpudp_magic(inet->saddr, inet->daddr, | |
990 | udp_len, IPPROTO_UDP, 0); | |
991 | } | |
3557baab JC |
992 | |
993 | /* Debug */ | |
994 | if (session->send_seq) | |
995 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
38d15b65 | 996 | "%s: send %Zd bytes, ns=%hu\n", session->name, |
3557baab JC |
997 | total_len, session->ns - 1); |
998 | else | |
999 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
38d15b65 | 1000 | "%s: send %Zd bytes\n", session->name, total_len); |
3557baab JC |
1001 | |
1002 | if (session->debug & PPPOL2TP_MSG_DATA) { | |
1003 | int i; | |
1004 | unsigned char *datap = skb->data; | |
1005 | ||
1006 | printk(KERN_DEBUG "%s: xmit:", session->name); | |
1007 | for (i = 0; i < total_len; i++) { | |
1008 | printk(" %02X", *datap++); | |
1009 | if (i == 15) { | |
1010 | printk(" ..."); | |
1011 | break; | |
1012 | } | |
1013 | } | |
1014 | printk("\n"); | |
1015 | } | |
1016 | ||
1017 | /* Queue the packet to IP for output */ | |
7d4372b5 | 1018 | len = skb->len; |
3557baab JC |
1019 | error = ip_queue_xmit(skb, 1); |
1020 | ||
1021 | /* Update stats */ | |
1022 | if (error >= 0) { | |
1023 | tunnel->stats.tx_packets++; | |
7d4372b5 | 1024 | tunnel->stats.tx_bytes += len; |
3557baab | 1025 | session->stats.tx_packets++; |
7d4372b5 | 1026 | session->stats.tx_bytes += len; |
3557baab JC |
1027 | } else { |
1028 | tunnel->stats.tx_errors++; | |
1029 | session->stats.tx_errors++; | |
1030 | } | |
1031 | ||
24b95685 JC |
1032 | return error; |
1033 | ||
1034 | error_put_sess_tun: | |
1035 | sock_put(session->tunnel_sock); | |
1036 | error_put_sess: | |
1037 | sock_put(sk); | |
3557baab JC |
1038 | error: |
1039 | return error; | |
1040 | } | |
1041 | ||
24b95685 JC |
1042 | /* Automatically called when the skb is freed. |
1043 | */ | |
1044 | static void pppol2tp_sock_wfree(struct sk_buff *skb) | |
1045 | { | |
1046 | sock_put(skb->sk); | |
1047 | } | |
1048 | ||
1049 | /* For data skbs that we transmit, we associate with the tunnel socket | |
1050 | * but don't do accounting. | |
1051 | */ | |
1052 | static inline void pppol2tp_skb_set_owner_w(struct sk_buff *skb, struct sock *sk) | |
1053 | { | |
1054 | sock_hold(sk); | |
1055 | skb->sk = sk; | |
1056 | skb->destructor = pppol2tp_sock_wfree; | |
1057 | } | |
1058 | ||
3557baab JC |
1059 | /* Transmit function called by generic PPP driver. Sends PPP frame |
1060 | * over PPPoL2TP socket. | |
1061 | * | |
1062 | * This is almost the same as pppol2tp_sendmsg(), but rather than | |
1063 | * being called with a msghdr from userspace, it is called with a skb | |
1064 | * from the kernel. | |
1065 | * | |
1066 | * The supplied skb from ppp doesn't have enough headroom for the | |
1067 | * insertion of L2TP, UDP and IP headers so we need to allocate more | |
1068 | * headroom in the skb. This will create a cloned skb. But we must be | |
1069 | * careful in the error case because the caller will expect to free | |
1070 | * the skb it supplied, not our cloned skb. So we take care to always | |
1071 | * leave the original skb unfreed if we return an error. | |
1072 | */ | |
1073 | static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
1074 | { | |
1075 | static const u8 ppph[2] = { 0xff, 0x03 }; | |
1076 | struct sock *sk = (struct sock *) chan->private; | |
1077 | struct sock *sk_tun; | |
1078 | int hdr_len; | |
ffcebb16 | 1079 | u16 udp_len; |
3557baab JC |
1080 | struct pppol2tp_session *session; |
1081 | struct pppol2tp_tunnel *tunnel; | |
1082 | int rc; | |
1083 | int headroom; | |
1084 | int data_len = skb->len; | |
1085 | struct inet_sock *inet; | |
ffcebb16 | 1086 | __wsum csum; |
3557baab | 1087 | struct udphdr *uh; |
7d4372b5 | 1088 | unsigned int len; |
090c48d3 JC |
1089 | int old_headroom; |
1090 | int new_headroom; | |
3557baab JC |
1091 | |
1092 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
1093 | goto abort; | |
1094 | ||
1095 | /* Get session and tunnel contexts from the socket */ | |
1096 | session = pppol2tp_sock_to_session(sk); | |
1097 | if (session == NULL) | |
1098 | goto abort; | |
1099 | ||
1100 | sk_tun = session->tunnel_sock; | |
1101 | if (sk_tun == NULL) | |
24b95685 | 1102 | goto abort_put_sess; |
3557baab JC |
1103 | tunnel = pppol2tp_sock_to_tunnel(sk_tun); |
1104 | if (tunnel == NULL) | |
24b95685 | 1105 | goto abort_put_sess; |
3557baab JC |
1106 | |
1107 | /* What header length is configured for this session? */ | |
1108 | hdr_len = pppol2tp_l2tp_header_len(session); | |
1109 | ||
1110 | /* Check that there's enough headroom in the skb to insert IP, | |
1111 | * UDP and L2TP and PPP headers. If not enough, expand it to | |
090c48d3 | 1112 | * make room. Adjust truesize. |
3557baab JC |
1113 | */ |
1114 | headroom = NET_SKB_PAD + sizeof(struct iphdr) + | |
1115 | sizeof(struct udphdr) + hdr_len + sizeof(ppph); | |
090c48d3 | 1116 | old_headroom = skb_headroom(skb); |
f3d5e3a4 | 1117 | if (skb_cow_head(skb, headroom)) |
24b95685 | 1118 | goto abort_put_sess_tun; |
3557baab | 1119 | |
090c48d3 JC |
1120 | new_headroom = skb_headroom(skb); |
1121 | skb_orphan(skb); | |
1122 | skb->truesize += new_headroom - old_headroom; | |
1123 | ||
3557baab | 1124 | /* Setup PPP header */ |
f3d5e3a4 HX |
1125 | __skb_push(skb, sizeof(ppph)); |
1126 | skb->data[0] = ppph[0]; | |
1127 | skb->data[1] = ppph[1]; | |
3557baab JC |
1128 | |
1129 | /* Setup L2TP header */ | |
f3d5e3a4 | 1130 | pppol2tp_build_l2tp_header(session, __skb_push(skb, hdr_len)); |
3557baab | 1131 | |
ffcebb16 JC |
1132 | udp_len = sizeof(struct udphdr) + hdr_len + sizeof(ppph) + data_len; |
1133 | ||
3557baab JC |
1134 | /* Setup UDP header */ |
1135 | inet = inet_sk(sk_tun); | |
f3d5e3a4 HX |
1136 | __skb_push(skb, sizeof(*uh)); |
1137 | skb_reset_transport_header(skb); | |
1138 | uh = udp_hdr(skb); | |
3557baab JC |
1139 | uh->source = inet->sport; |
1140 | uh->dest = inet->dport; | |
ffcebb16 | 1141 | uh->len = htons(udp_len); |
3557baab JC |
1142 | uh->check = 0; |
1143 | ||
3557baab JC |
1144 | /* Debug */ |
1145 | if (session->send_seq) | |
1146 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
1147 | "%s: send %d bytes, ns=%hu\n", session->name, | |
1148 | data_len, session->ns - 1); | |
1149 | else | |
1150 | PRINTK(session->debug, PPPOL2TP_MSG_DATA, KERN_DEBUG, | |
1151 | "%s: send %d bytes\n", session->name, data_len); | |
1152 | ||
1153 | if (session->debug & PPPOL2TP_MSG_DATA) { | |
1154 | int i; | |
f3d5e3a4 | 1155 | unsigned char *datap = skb->data; |
3557baab JC |
1156 | |
1157 | printk(KERN_DEBUG "%s: xmit:", session->name); | |
1158 | for (i = 0; i < data_len; i++) { | |
1159 | printk(" %02X", *datap++); | |
1160 | if (i == 31) { | |
1161 | printk(" ..."); | |
1162 | break; | |
1163 | } | |
1164 | } | |
1165 | printk("\n"); | |
1166 | } | |
1167 | ||
f3d5e3a4 HX |
1168 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1169 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | | |
1170 | IPSKB_REROUTED); | |
1171 | nf_reset(skb); | |
f77ae939 | 1172 | |
3557baab | 1173 | /* Get routing info from the tunnel socket */ |
adf30907 ED |
1174 | skb_dst_drop(skb); |
1175 | skb_dst_set(skb, dst_clone(__sk_dst_get(sk_tun))); | |
24b95685 | 1176 | pppol2tp_skb_set_owner_w(skb, sk_tun); |
3557baab | 1177 | |
ffcebb16 JC |
1178 | /* Calculate UDP checksum if configured to do so */ |
1179 | if (sk_tun->sk_no_check == UDP_CSUM_NOXMIT) | |
1180 | skb->ip_summed = CHECKSUM_NONE; | |
adf30907 | 1181 | else if (!(skb_dst(skb)->dev->features & NETIF_F_V4_CSUM)) { |
ffcebb16 JC |
1182 | skb->ip_summed = CHECKSUM_COMPLETE; |
1183 | csum = skb_checksum(skb, 0, udp_len, 0); | |
1184 | uh->check = csum_tcpudp_magic(inet->saddr, inet->daddr, | |
1185 | udp_len, IPPROTO_UDP, csum); | |
1186 | if (uh->check == 0) | |
1187 | uh->check = CSUM_MANGLED_0; | |
1188 | } else { | |
1189 | skb->ip_summed = CHECKSUM_PARTIAL; | |
1190 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1191 | skb->csum_offset = offsetof(struct udphdr, check); | |
1192 | uh->check = ~csum_tcpudp_magic(inet->saddr, inet->daddr, | |
1193 | udp_len, IPPROTO_UDP, 0); | |
1194 | } | |
1195 | ||
3557baab | 1196 | /* Queue the packet to IP for output */ |
f3d5e3a4 HX |
1197 | len = skb->len; |
1198 | rc = ip_queue_xmit(skb, 1); | |
3557baab JC |
1199 | |
1200 | /* Update stats */ | |
1201 | if (rc >= 0) { | |
1202 | tunnel->stats.tx_packets++; | |
7d4372b5 | 1203 | tunnel->stats.tx_bytes += len; |
3557baab | 1204 | session->stats.tx_packets++; |
7d4372b5 | 1205 | session->stats.tx_bytes += len; |
3557baab JC |
1206 | } else { |
1207 | tunnel->stats.tx_errors++; | |
1208 | session->stats.tx_errors++; | |
1209 | } | |
1210 | ||
24b95685 JC |
1211 | sock_put(sk_tun); |
1212 | sock_put(sk); | |
3557baab JC |
1213 | return 1; |
1214 | ||
24b95685 JC |
1215 | abort_put_sess_tun: |
1216 | sock_put(sk_tun); | |
1217 | abort_put_sess: | |
1218 | sock_put(sk); | |
3557baab | 1219 | abort: |
f3d5e3a4 HX |
1220 | /* Free the original skb */ |
1221 | kfree_skb(skb); | |
1222 | return 1; | |
3557baab JC |
1223 | } |
1224 | ||
1225 | /***************************************************************************** | |
1226 | * Session (and tunnel control) socket create/destroy. | |
1227 | *****************************************************************************/ | |
1228 | ||
1229 | /* When the tunnel UDP socket is closed, all the attached sockets need to go | |
1230 | * too. | |
1231 | */ | |
1232 | static void pppol2tp_tunnel_closeall(struct pppol2tp_tunnel *tunnel) | |
1233 | { | |
1234 | int hash; | |
1235 | struct hlist_node *walk; | |
1236 | struct hlist_node *tmp; | |
1237 | struct pppol2tp_session *session; | |
1238 | struct sock *sk; | |
1239 | ||
0ee904c3 | 1240 | BUG_ON(tunnel == NULL); |
3557baab JC |
1241 | |
1242 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1243 | "%s: closing all sessions...\n", tunnel->name); | |
1244 | ||
cf3752e2 | 1245 | write_lock_bh(&tunnel->hlist_lock); |
3557baab JC |
1246 | for (hash = 0; hash < PPPOL2TP_HASH_SIZE; hash++) { |
1247 | again: | |
1248 | hlist_for_each_safe(walk, tmp, &tunnel->session_hlist[hash]) { | |
ec9b6add JP |
1249 | struct sk_buff *skb; |
1250 | ||
3557baab JC |
1251 | session = hlist_entry(walk, struct pppol2tp_session, hlist); |
1252 | ||
1253 | sk = session->sock; | |
1254 | ||
1255 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1256 | "%s: closing session\n", session->name); | |
1257 | ||
1258 | hlist_del_init(&session->hlist); | |
1259 | ||
1260 | /* Since we should hold the sock lock while | |
1261 | * doing any unbinding, we need to release the | |
1262 | * lock we're holding before taking that lock. | |
1263 | * Hold a reference to the sock so it doesn't | |
1264 | * disappear as we're jumping between locks. | |
1265 | */ | |
1266 | sock_hold(sk); | |
cf3752e2 | 1267 | write_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
1268 | lock_sock(sk); |
1269 | ||
1270 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { | |
1271 | pppox_unbind_sock(sk); | |
1272 | sk->sk_state = PPPOX_DEAD; | |
1273 | sk->sk_state_change(sk); | |
1274 | } | |
1275 | ||
1276 | /* Purge any queued data */ | |
1277 | skb_queue_purge(&sk->sk_receive_queue); | |
1278 | skb_queue_purge(&sk->sk_write_queue); | |
ec9b6add JP |
1279 | while ((skb = skb_dequeue(&session->reorder_q))) { |
1280 | kfree_skb(skb); | |
1281 | sock_put(sk); | |
1282 | } | |
3557baab JC |
1283 | |
1284 | release_sock(sk); | |
1285 | sock_put(sk); | |
1286 | ||
1287 | /* Now restart from the beginning of this hash | |
1288 | * chain. We always remove a session from the | |
1289 | * list so we are guaranteed to make forward | |
1290 | * progress. | |
1291 | */ | |
cf3752e2 | 1292 | write_lock_bh(&tunnel->hlist_lock); |
3557baab JC |
1293 | goto again; |
1294 | } | |
1295 | } | |
cf3752e2 | 1296 | write_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
1297 | } |
1298 | ||
1299 | /* Really kill the tunnel. | |
1300 | * Come here only when all sessions have been cleared from the tunnel. | |
1301 | */ | |
1302 | static void pppol2tp_tunnel_free(struct pppol2tp_tunnel *tunnel) | |
1303 | { | |
4e9fb801 CG |
1304 | struct pppol2tp_net *pn = pppol2tp_pernet(tunnel->pppol2tp_net); |
1305 | ||
3557baab | 1306 | /* Remove from socket list */ |
4e9fb801 | 1307 | write_lock_bh(&pn->pppol2tp_tunnel_list_lock); |
3557baab | 1308 | list_del_init(&tunnel->list); |
4e9fb801 | 1309 | write_unlock_bh(&pn->pppol2tp_tunnel_list_lock); |
3557baab JC |
1310 | |
1311 | atomic_dec(&pppol2tp_tunnel_count); | |
1312 | kfree(tunnel); | |
1313 | } | |
1314 | ||
1315 | /* Tunnel UDP socket destruct hook. | |
1316 | * The tunnel context is deleted only when all session sockets have been | |
1317 | * closed. | |
1318 | */ | |
1319 | static void pppol2tp_tunnel_destruct(struct sock *sk) | |
1320 | { | |
1321 | struct pppol2tp_tunnel *tunnel; | |
1322 | ||
24b95685 | 1323 | tunnel = sk->sk_user_data; |
3557baab JC |
1324 | if (tunnel == NULL) |
1325 | goto end; | |
1326 | ||
1327 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1328 | "%s: closing...\n", tunnel->name); | |
1329 | ||
1330 | /* Close all sessions */ | |
1331 | pppol2tp_tunnel_closeall(tunnel); | |
1332 | ||
1333 | /* No longer an encapsulation socket. See net/ipv4/udp.c */ | |
1334 | (udp_sk(sk))->encap_type = 0; | |
1335 | (udp_sk(sk))->encap_rcv = NULL; | |
1336 | ||
1337 | /* Remove hooks into tunnel socket */ | |
1338 | tunnel->sock = NULL; | |
1339 | sk->sk_destruct = tunnel->old_sk_destruct; | |
1340 | sk->sk_user_data = NULL; | |
1341 | ||
1342 | /* Call original (UDP) socket descructor */ | |
1343 | if (sk->sk_destruct != NULL) | |
1344 | (*sk->sk_destruct)(sk); | |
1345 | ||
1346 | pppol2tp_tunnel_dec_refcount(tunnel); | |
1347 | ||
1348 | end: | |
1349 | return; | |
1350 | } | |
1351 | ||
1352 | /* Really kill the session socket. (Called from sock_put() if | |
1353 | * refcnt == 0.) | |
1354 | */ | |
1355 | static void pppol2tp_session_destruct(struct sock *sk) | |
1356 | { | |
1357 | struct pppol2tp_session *session = NULL; | |
1358 | ||
1359 | if (sk->sk_user_data != NULL) { | |
1360 | struct pppol2tp_tunnel *tunnel; | |
1361 | ||
24b95685 | 1362 | session = sk->sk_user_data; |
3557baab JC |
1363 | if (session == NULL) |
1364 | goto out; | |
1365 | ||
24b95685 JC |
1366 | BUG_ON(session->magic != L2TP_SESSION_MAGIC); |
1367 | ||
3557baab JC |
1368 | /* Don't use pppol2tp_sock_to_tunnel() here to |
1369 | * get the tunnel context because the tunnel | |
1370 | * socket might have already been closed (its | |
1371 | * sk->sk_user_data will be NULL) so use the | |
1372 | * session's private tunnel ptr instead. | |
1373 | */ | |
1374 | tunnel = session->tunnel; | |
1375 | if (tunnel != NULL) { | |
1376 | BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC); | |
1377 | ||
1378 | /* If session_id is zero, this is a null | |
1379 | * session context, which was created for a | |
1380 | * socket that is being used only to manage | |
1381 | * tunnels. | |
1382 | */ | |
1383 | if (session->tunnel_addr.s_session != 0) { | |
1384 | /* Delete the session socket from the | |
1385 | * hash | |
1386 | */ | |
cf3752e2 | 1387 | write_lock_bh(&tunnel->hlist_lock); |
3557baab | 1388 | hlist_del_init(&session->hlist); |
cf3752e2 | 1389 | write_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
1390 | |
1391 | atomic_dec(&pppol2tp_session_count); | |
1392 | } | |
1393 | ||
1394 | /* This will delete the tunnel context if this | |
1395 | * is the last session on the tunnel. | |
1396 | */ | |
1397 | session->tunnel = NULL; | |
1398 | session->tunnel_sock = NULL; | |
1399 | pppol2tp_tunnel_dec_refcount(tunnel); | |
1400 | } | |
1401 | } | |
1402 | ||
1403 | kfree(session); | |
1404 | out: | |
1405 | return; | |
1406 | } | |
1407 | ||
1408 | /* Called when the PPPoX socket (session) is closed. | |
1409 | */ | |
1410 | static int pppol2tp_release(struct socket *sock) | |
1411 | { | |
1412 | struct sock *sk = sock->sk; | |
199f7d24 | 1413 | struct pppol2tp_session *session; |
3557baab JC |
1414 | int error; |
1415 | ||
1416 | if (!sk) | |
1417 | return 0; | |
1418 | ||
1419 | error = -EBADF; | |
1420 | lock_sock(sk); | |
1421 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
1422 | goto error; | |
1423 | ||
1424 | pppox_unbind_sock(sk); | |
1425 | ||
1426 | /* Signal the death of the socket. */ | |
1427 | sk->sk_state = PPPOX_DEAD; | |
1428 | sock_orphan(sk); | |
1429 | sock->sk = NULL; | |
1430 | ||
199f7d24 JC |
1431 | session = pppol2tp_sock_to_session(sk); |
1432 | ||
3557baab JC |
1433 | /* Purge any queued data */ |
1434 | skb_queue_purge(&sk->sk_receive_queue); | |
1435 | skb_queue_purge(&sk->sk_write_queue); | |
199f7d24 JC |
1436 | if (session != NULL) { |
1437 | struct sk_buff *skb; | |
1438 | while ((skb = skb_dequeue(&session->reorder_q))) { | |
1439 | kfree_skb(skb); | |
1440 | sock_put(sk); | |
1441 | } | |
e6358135 | 1442 | sock_put(sk); |
199f7d24 | 1443 | } |
3557baab JC |
1444 | |
1445 | release_sock(sk); | |
1446 | ||
1447 | /* This will delete the session context via | |
1448 | * pppol2tp_session_destruct() if the socket's refcnt drops to | |
1449 | * zero. | |
1450 | */ | |
1451 | sock_put(sk); | |
1452 | ||
1453 | return 0; | |
1454 | ||
1455 | error: | |
1456 | release_sock(sk); | |
1457 | return error; | |
1458 | } | |
1459 | ||
1460 | /* Internal function to prepare a tunnel (UDP) socket to have PPPoX | |
1461 | * sockets attached to it. | |
1462 | */ | |
4e9fb801 CG |
1463 | static struct sock *pppol2tp_prepare_tunnel_socket(struct net *net, |
1464 | int fd, u16 tunnel_id, int *error) | |
3557baab JC |
1465 | { |
1466 | int err; | |
1467 | struct socket *sock = NULL; | |
1468 | struct sock *sk; | |
1469 | struct pppol2tp_tunnel *tunnel; | |
4e9fb801 | 1470 | struct pppol2tp_net *pn; |
3557baab JC |
1471 | struct sock *ret = NULL; |
1472 | ||
1473 | /* Get the tunnel UDP socket from the fd, which was opened by | |
1474 | * the userspace L2TP daemon. | |
1475 | */ | |
1476 | err = -EBADF; | |
1477 | sock = sockfd_lookup(fd, &err); | |
1478 | if (!sock) { | |
1479 | PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR, | |
1480 | "tunl %hu: sockfd_lookup(fd=%d) returned %d\n", | |
1481 | tunnel_id, fd, err); | |
1482 | goto err; | |
1483 | } | |
1484 | ||
a14d6abc HX |
1485 | sk = sock->sk; |
1486 | ||
3557baab | 1487 | /* Quick sanity checks */ |
a14d6abc HX |
1488 | err = -EPROTONOSUPPORT; |
1489 | if (sk->sk_protocol != IPPROTO_UDP) { | |
3557baab | 1490 | PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR, |
a14d6abc HX |
1491 | "tunl %hu: fd %d wrong protocol, got %d, expected %d\n", |
1492 | tunnel_id, fd, sk->sk_protocol, IPPROTO_UDP); | |
3557baab JC |
1493 | goto err; |
1494 | } | |
1495 | err = -EAFNOSUPPORT; | |
1496 | if (sock->ops->family != AF_INET) { | |
1497 | PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_ERR, | |
1498 | "tunl %hu: fd %d wrong family, got %d, expected %d\n", | |
1499 | tunnel_id, fd, sock->ops->family, AF_INET); | |
1500 | goto err; | |
1501 | } | |
1502 | ||
1503 | err = -ENOTCONN; | |
3557baab JC |
1504 | |
1505 | /* Check if this socket has already been prepped */ | |
1506 | tunnel = (struct pppol2tp_tunnel *)sk->sk_user_data; | |
1507 | if (tunnel != NULL) { | |
1508 | /* User-data field already set */ | |
1509 | err = -EBUSY; | |
1510 | BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC); | |
1511 | ||
1512 | /* This socket has already been prepped */ | |
1513 | ret = tunnel->sock; | |
1514 | goto out; | |
1515 | } | |
1516 | ||
1517 | /* This socket is available and needs prepping. Create a new tunnel | |
1518 | * context and init it. | |
1519 | */ | |
1520 | sk->sk_user_data = tunnel = kzalloc(sizeof(struct pppol2tp_tunnel), GFP_KERNEL); | |
1521 | if (sk->sk_user_data == NULL) { | |
1522 | err = -ENOMEM; | |
1523 | goto err; | |
1524 | } | |
1525 | ||
1526 | tunnel->magic = L2TP_TUNNEL_MAGIC; | |
1527 | sprintf(&tunnel->name[0], "tunl %hu", tunnel_id); | |
1528 | ||
1529 | tunnel->stats.tunnel_id = tunnel_id; | |
1530 | tunnel->debug = PPPOL2TP_DEFAULT_DEBUG_FLAGS; | |
1531 | ||
1532 | /* Hook on the tunnel socket destructor so that we can cleanup | |
1533 | * if the tunnel socket goes away. | |
1534 | */ | |
1535 | tunnel->old_sk_destruct = sk->sk_destruct; | |
1536 | sk->sk_destruct = &pppol2tp_tunnel_destruct; | |
1537 | ||
1538 | tunnel->sock = sk; | |
1539 | sk->sk_allocation = GFP_ATOMIC; | |
1540 | ||
1541 | /* Misc init */ | |
1542 | rwlock_init(&tunnel->hlist_lock); | |
1543 | ||
4e9fb801 CG |
1544 | /* The net we belong to */ |
1545 | tunnel->pppol2tp_net = net; | |
1546 | pn = pppol2tp_pernet(net); | |
1547 | ||
3557baab JC |
1548 | /* Add tunnel to our list */ |
1549 | INIT_LIST_HEAD(&tunnel->list); | |
4e9fb801 CG |
1550 | write_lock_bh(&pn->pppol2tp_tunnel_list_lock); |
1551 | list_add(&tunnel->list, &pn->pppol2tp_tunnel_list); | |
1552 | write_unlock_bh(&pn->pppol2tp_tunnel_list_lock); | |
3557baab JC |
1553 | atomic_inc(&pppol2tp_tunnel_count); |
1554 | ||
1555 | /* Bump the reference count. The tunnel context is deleted | |
1556 | * only when this drops to zero. | |
1557 | */ | |
1558 | pppol2tp_tunnel_inc_refcount(tunnel); | |
1559 | ||
1560 | /* Mark socket as an encapsulation socket. See net/ipv4/udp.c */ | |
1561 | (udp_sk(sk))->encap_type = UDP_ENCAP_L2TPINUDP; | |
1562 | (udp_sk(sk))->encap_rcv = pppol2tp_udp_encap_recv; | |
1563 | ||
1564 | ret = tunnel->sock; | |
1565 | ||
1566 | *error = 0; | |
1567 | out: | |
1568 | if (sock) | |
1569 | sockfd_put(sock); | |
1570 | ||
1571 | return ret; | |
1572 | ||
1573 | err: | |
1574 | *error = err; | |
1575 | goto out; | |
1576 | } | |
1577 | ||
1578 | static struct proto pppol2tp_sk_proto = { | |
1579 | .name = "PPPOL2TP", | |
1580 | .owner = THIS_MODULE, | |
1581 | .obj_size = sizeof(struct pppox_sock), | |
1582 | }; | |
1583 | ||
1584 | /* socket() handler. Initialize a new struct sock. | |
1585 | */ | |
1b8d7ae4 | 1586 | static int pppol2tp_create(struct net *net, struct socket *sock) |
3557baab JC |
1587 | { |
1588 | int error = -ENOMEM; | |
1589 | struct sock *sk; | |
1590 | ||
6257ff21 | 1591 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppol2tp_sk_proto); |
3557baab JC |
1592 | if (!sk) |
1593 | goto out; | |
1594 | ||
1595 | sock_init_data(sock, sk); | |
1596 | ||
1597 | sock->state = SS_UNCONNECTED; | |
1598 | sock->ops = &pppol2tp_ops; | |
1599 | ||
1600 | sk->sk_backlog_rcv = pppol2tp_recv_core; | |
1601 | sk->sk_protocol = PX_PROTO_OL2TP; | |
1602 | sk->sk_family = PF_PPPOX; | |
1603 | sk->sk_state = PPPOX_NONE; | |
1604 | sk->sk_type = SOCK_STREAM; | |
1605 | sk->sk_destruct = pppol2tp_session_destruct; | |
1606 | ||
1607 | error = 0; | |
1608 | ||
1609 | out: | |
1610 | return error; | |
1611 | } | |
1612 | ||
1613 | /* connect() handler. Attach a PPPoX socket to a tunnel UDP socket | |
1614 | */ | |
1615 | static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
1616 | int sockaddr_len, int flags) | |
1617 | { | |
1618 | struct sock *sk = sock->sk; | |
1619 | struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr; | |
1620 | struct pppox_sock *po = pppox_sk(sk); | |
1621 | struct sock *tunnel_sock = NULL; | |
1622 | struct pppol2tp_session *session = NULL; | |
1623 | struct pppol2tp_tunnel *tunnel; | |
1624 | struct dst_entry *dst; | |
1625 | int error = 0; | |
1626 | ||
1627 | lock_sock(sk); | |
1628 | ||
1629 | error = -EINVAL; | |
1630 | if (sp->sa_protocol != PX_PROTO_OL2TP) | |
1631 | goto end; | |
1632 | ||
1633 | /* Check for already bound sockets */ | |
1634 | error = -EBUSY; | |
1635 | if (sk->sk_state & PPPOX_CONNECTED) | |
1636 | goto end; | |
1637 | ||
1638 | /* We don't supporting rebinding anyway */ | |
1639 | error = -EALREADY; | |
1640 | if (sk->sk_user_data) | |
1641 | goto end; /* socket is already attached */ | |
1642 | ||
1643 | /* Don't bind if s_tunnel is 0 */ | |
1644 | error = -EINVAL; | |
1645 | if (sp->pppol2tp.s_tunnel == 0) | |
1646 | goto end; | |
1647 | ||
1648 | /* Special case: prepare tunnel socket if s_session and | |
1649 | * d_session is 0. Otherwise look up tunnel using supplied | |
1650 | * tunnel id. | |
1651 | */ | |
1652 | if ((sp->pppol2tp.s_session == 0) && (sp->pppol2tp.d_session == 0)) { | |
4e9fb801 CG |
1653 | tunnel_sock = pppol2tp_prepare_tunnel_socket(sock_net(sk), |
1654 | sp->pppol2tp.fd, | |
3557baab JC |
1655 | sp->pppol2tp.s_tunnel, |
1656 | &error); | |
1657 | if (tunnel_sock == NULL) | |
1658 | goto end; | |
1659 | ||
1660 | tunnel = tunnel_sock->sk_user_data; | |
1661 | } else { | |
4e9fb801 | 1662 | tunnel = pppol2tp_tunnel_find(sock_net(sk), sp->pppol2tp.s_tunnel); |
3557baab JC |
1663 | |
1664 | /* Error if we can't find the tunnel */ | |
1665 | error = -ENOENT; | |
1666 | if (tunnel == NULL) | |
1667 | goto end; | |
1668 | ||
1669 | tunnel_sock = tunnel->sock; | |
1670 | } | |
1671 | ||
1672 | /* Check that this session doesn't already exist */ | |
1673 | error = -EEXIST; | |
1674 | session = pppol2tp_session_find(tunnel, sp->pppol2tp.s_session); | |
1675 | if (session != NULL) | |
1676 | goto end; | |
1677 | ||
1678 | /* Allocate and initialize a new session context. */ | |
1679 | session = kzalloc(sizeof(struct pppol2tp_session), GFP_KERNEL); | |
1680 | if (session == NULL) { | |
1681 | error = -ENOMEM; | |
1682 | goto end; | |
1683 | } | |
1684 | ||
1685 | skb_queue_head_init(&session->reorder_q); | |
1686 | ||
1687 | session->magic = L2TP_SESSION_MAGIC; | |
1688 | session->owner = current->pid; | |
1689 | session->sock = sk; | |
1690 | session->tunnel = tunnel; | |
1691 | session->tunnel_sock = tunnel_sock; | |
1692 | session->tunnel_addr = sp->pppol2tp; | |
1693 | sprintf(&session->name[0], "sess %hu/%hu", | |
1694 | session->tunnel_addr.s_tunnel, | |
1695 | session->tunnel_addr.s_session); | |
1696 | ||
1697 | session->stats.tunnel_id = session->tunnel_addr.s_tunnel; | |
1698 | session->stats.session_id = session->tunnel_addr.s_session; | |
1699 | ||
1700 | INIT_HLIST_NODE(&session->hlist); | |
1701 | ||
1702 | /* Inherit debug options from tunnel */ | |
1703 | session->debug = tunnel->debug; | |
1704 | ||
1705 | /* Default MTU must allow space for UDP/L2TP/PPP | |
1706 | * headers. | |
1707 | */ | |
1708 | session->mtu = session->mru = 1500 - PPPOL2TP_HEADER_OVERHEAD; | |
1709 | ||
1710 | /* If PMTU discovery was enabled, use the MTU that was discovered */ | |
1711 | dst = sk_dst_get(sk); | |
1712 | if (dst != NULL) { | |
1713 | u32 pmtu = dst_mtu(__sk_dst_get(sk)); | |
1714 | if (pmtu != 0) | |
1715 | session->mtu = session->mru = pmtu - | |
1716 | PPPOL2TP_HEADER_OVERHEAD; | |
1717 | dst_release(dst); | |
1718 | } | |
1719 | ||
1720 | /* Special case: if source & dest session_id == 0x0000, this socket is | |
1721 | * being created to manage the tunnel. Don't add the session to the | |
1722 | * session hash list, just set up the internal context for use by | |
1723 | * ioctl() and sockopt() handlers. | |
1724 | */ | |
1725 | if ((session->tunnel_addr.s_session == 0) && | |
1726 | (session->tunnel_addr.d_session == 0)) { | |
1727 | error = 0; | |
1728 | sk->sk_user_data = session; | |
1729 | goto out_no_ppp; | |
1730 | } | |
1731 | ||
1732 | /* Get tunnel context from the tunnel socket */ | |
1733 | tunnel = pppol2tp_sock_to_tunnel(tunnel_sock); | |
1734 | if (tunnel == NULL) { | |
1735 | error = -EBADF; | |
1736 | goto end; | |
1737 | } | |
1738 | ||
1739 | /* Right now, because we don't have a way to push the incoming skb's | |
1740 | * straight through the UDP layer, the only header we need to worry | |
1741 | * about is the L2TP header. This size is different depending on | |
1742 | * whether sequence numbers are enabled for the data channel. | |
1743 | */ | |
1744 | po->chan.hdrlen = PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
1745 | ||
1746 | po->chan.private = sk; | |
1747 | po->chan.ops = &pppol2tp_chan_ops; | |
1748 | po->chan.mtu = session->mtu; | |
1749 | ||
f5882c30 | 1750 | error = ppp_register_net_channel(sock_net(sk), &po->chan); |
3557baab | 1751 | if (error) |
24b95685 | 1752 | goto end_put_tun; |
3557baab JC |
1753 | |
1754 | /* This is how we get the session context from the socket. */ | |
1755 | sk->sk_user_data = session; | |
1756 | ||
1757 | /* Add session to the tunnel's hash list */ | |
cf3752e2 | 1758 | write_lock_bh(&tunnel->hlist_lock); |
3557baab JC |
1759 | hlist_add_head(&session->hlist, |
1760 | pppol2tp_session_id_hash(tunnel, | |
1761 | session->tunnel_addr.s_session)); | |
cf3752e2 | 1762 | write_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
1763 | |
1764 | atomic_inc(&pppol2tp_session_count); | |
1765 | ||
1766 | out_no_ppp: | |
1767 | pppol2tp_tunnel_inc_refcount(tunnel); | |
1768 | sk->sk_state = PPPOX_CONNECTED; | |
1769 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1770 | "%s: created\n", session->name); | |
1771 | ||
24b95685 JC |
1772 | end_put_tun: |
1773 | sock_put(tunnel_sock); | |
3557baab JC |
1774 | end: |
1775 | release_sock(sk); | |
1776 | ||
5dc474d6 JL |
1777 | if (error != 0) { |
1778 | if (session) | |
1779 | PRINTK(session->debug, | |
1780 | PPPOL2TP_MSG_CONTROL, KERN_WARNING, | |
1781 | "%s: connect failed: %d\n", | |
1782 | session->name, error); | |
1783 | else | |
1784 | PRINTK(-1, PPPOL2TP_MSG_CONTROL, KERN_WARNING, | |
1785 | "connect failed: %d\n", error); | |
1786 | } | |
3557baab JC |
1787 | |
1788 | return error; | |
1789 | } | |
1790 | ||
1791 | /* getname() support. | |
1792 | */ | |
1793 | static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr, | |
1794 | int *usockaddr_len, int peer) | |
1795 | { | |
1796 | int len = sizeof(struct sockaddr_pppol2tp); | |
1797 | struct sockaddr_pppol2tp sp; | |
1798 | int error = 0; | |
1799 | struct pppol2tp_session *session; | |
1800 | ||
1801 | error = -ENOTCONN; | |
1802 | if (sock->sk->sk_state != PPPOX_CONNECTED) | |
1803 | goto end; | |
1804 | ||
1805 | session = pppol2tp_sock_to_session(sock->sk); | |
1806 | if (session == NULL) { | |
1807 | error = -EBADF; | |
1808 | goto end; | |
1809 | } | |
1810 | ||
1811 | sp.sa_family = AF_PPPOX; | |
1812 | sp.sa_protocol = PX_PROTO_OL2TP; | |
1813 | memcpy(&sp.pppol2tp, &session->tunnel_addr, | |
1814 | sizeof(struct pppol2tp_addr)); | |
1815 | ||
1816 | memcpy(uaddr, &sp, len); | |
1817 | ||
1818 | *usockaddr_len = len; | |
1819 | ||
1820 | error = 0; | |
24b95685 | 1821 | sock_put(sock->sk); |
3557baab JC |
1822 | |
1823 | end: | |
1824 | return error; | |
1825 | } | |
1826 | ||
1827 | /**************************************************************************** | |
1828 | * ioctl() handlers. | |
1829 | * | |
1830 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
1831 | * sockets. However, in order to control kernel tunnel features, we allow | |
1832 | * userspace to create a special "tunnel" PPPoX socket which is used for | |
1833 | * control only. Tunnel PPPoX sockets have session_id == 0 and simply allow | |
1834 | * the user application to issue L2TP setsockopt(), getsockopt() and ioctl() | |
1835 | * calls. | |
1836 | ****************************************************************************/ | |
1837 | ||
1838 | /* Session ioctl helper. | |
1839 | */ | |
1840 | static int pppol2tp_session_ioctl(struct pppol2tp_session *session, | |
1841 | unsigned int cmd, unsigned long arg) | |
1842 | { | |
1843 | struct ifreq ifr; | |
1844 | int err = 0; | |
1845 | struct sock *sk = session->sock; | |
1846 | int val = (int) arg; | |
1847 | ||
1848 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG, | |
1849 | "%s: pppol2tp_session_ioctl(cmd=%#x, arg=%#lx)\n", | |
1850 | session->name, cmd, arg); | |
1851 | ||
1852 | sock_hold(sk); | |
1853 | ||
1854 | switch (cmd) { | |
1855 | case SIOCGIFMTU: | |
1856 | err = -ENXIO; | |
1857 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1858 | break; | |
1859 | ||
1860 | err = -EFAULT; | |
1861 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1862 | break; | |
1863 | ifr.ifr_mtu = session->mtu; | |
1864 | if (copy_to_user((void __user *) arg, &ifr, sizeof(struct ifreq))) | |
1865 | break; | |
1866 | ||
1867 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1868 | "%s: get mtu=%d\n", session->name, session->mtu); | |
1869 | err = 0; | |
1870 | break; | |
1871 | ||
1872 | case SIOCSIFMTU: | |
1873 | err = -ENXIO; | |
1874 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1875 | break; | |
1876 | ||
1877 | err = -EFAULT; | |
1878 | if (copy_from_user(&ifr, (void __user *) arg, sizeof(struct ifreq))) | |
1879 | break; | |
1880 | ||
1881 | session->mtu = ifr.ifr_mtu; | |
1882 | ||
1883 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1884 | "%s: set mtu=%d\n", session->name, session->mtu); | |
1885 | err = 0; | |
1886 | break; | |
1887 | ||
1888 | case PPPIOCGMRU: | |
1889 | err = -ENXIO; | |
1890 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1891 | break; | |
1892 | ||
1893 | err = -EFAULT; | |
1894 | if (put_user(session->mru, (int __user *) arg)) | |
1895 | break; | |
1896 | ||
1897 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1898 | "%s: get mru=%d\n", session->name, session->mru); | |
1899 | err = 0; | |
1900 | break; | |
1901 | ||
1902 | case PPPIOCSMRU: | |
1903 | err = -ENXIO; | |
1904 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1905 | break; | |
1906 | ||
1907 | err = -EFAULT; | |
1908 | if (get_user(val,(int __user *) arg)) | |
1909 | break; | |
1910 | ||
1911 | session->mru = val; | |
1912 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1913 | "%s: set mru=%d\n", session->name, session->mru); | |
1914 | err = 0; | |
1915 | break; | |
1916 | ||
1917 | case PPPIOCGFLAGS: | |
1918 | err = -EFAULT; | |
1919 | if (put_user(session->flags, (int __user *) arg)) | |
1920 | break; | |
1921 | ||
1922 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1923 | "%s: get flags=%d\n", session->name, session->flags); | |
1924 | err = 0; | |
1925 | break; | |
1926 | ||
1927 | case PPPIOCSFLAGS: | |
1928 | err = -EFAULT; | |
1929 | if (get_user(val, (int __user *) arg)) | |
1930 | break; | |
1931 | session->flags = val; | |
1932 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1933 | "%s: set flags=%d\n", session->name, session->flags); | |
1934 | err = 0; | |
1935 | break; | |
1936 | ||
1937 | case PPPIOCGL2TPSTATS: | |
1938 | err = -ENXIO; | |
1939 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1940 | break; | |
1941 | ||
1942 | if (copy_to_user((void __user *) arg, &session->stats, | |
1943 | sizeof(session->stats))) | |
1944 | break; | |
1945 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
1946 | "%s: get L2TP stats\n", session->name); | |
1947 | err = 0; | |
1948 | break; | |
1949 | ||
1950 | default: | |
1951 | err = -ENOSYS; | |
1952 | break; | |
1953 | } | |
1954 | ||
1955 | sock_put(sk); | |
1956 | ||
1957 | return err; | |
1958 | } | |
1959 | ||
1960 | /* Tunnel ioctl helper. | |
1961 | * | |
1962 | * Note the special handling for PPPIOCGL2TPSTATS below. If the ioctl data | |
1963 | * specifies a session_id, the session ioctl handler is called. This allows an | |
1964 | * application to retrieve session stats via a tunnel socket. | |
1965 | */ | |
1966 | static int pppol2tp_tunnel_ioctl(struct pppol2tp_tunnel *tunnel, | |
1967 | unsigned int cmd, unsigned long arg) | |
1968 | { | |
1969 | int err = 0; | |
1970 | struct sock *sk = tunnel->sock; | |
1971 | struct pppol2tp_ioc_stats stats_req; | |
1972 | ||
1973 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_DEBUG, | |
1974 | "%s: pppol2tp_tunnel_ioctl(cmd=%#x, arg=%#lx)\n", tunnel->name, | |
1975 | cmd, arg); | |
1976 | ||
1977 | sock_hold(sk); | |
1978 | ||
1979 | switch (cmd) { | |
1980 | case PPPIOCGL2TPSTATS: | |
1981 | err = -ENXIO; | |
1982 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
1983 | break; | |
1984 | ||
1985 | if (copy_from_user(&stats_req, (void __user *) arg, | |
1986 | sizeof(stats_req))) { | |
1987 | err = -EFAULT; | |
1988 | break; | |
1989 | } | |
1990 | if (stats_req.session_id != 0) { | |
1991 | /* resend to session ioctl handler */ | |
1992 | struct pppol2tp_session *session = | |
1993 | pppol2tp_session_find(tunnel, stats_req.session_id); | |
1994 | if (session != NULL) | |
1995 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
1996 | else | |
1997 | err = -EBADR; | |
1998 | break; | |
1999 | } | |
2000 | #ifdef CONFIG_XFRM | |
2001 | tunnel->stats.using_ipsec = (sk->sk_policy[0] || sk->sk_policy[1]) ? 1 : 0; | |
2002 | #endif | |
2003 | if (copy_to_user((void __user *) arg, &tunnel->stats, | |
2004 | sizeof(tunnel->stats))) { | |
2005 | err = -EFAULT; | |
2006 | break; | |
2007 | } | |
2008 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2009 | "%s: get L2TP stats\n", tunnel->name); | |
2010 | err = 0; | |
2011 | break; | |
2012 | ||
2013 | default: | |
2014 | err = -ENOSYS; | |
2015 | break; | |
2016 | } | |
2017 | ||
2018 | sock_put(sk); | |
2019 | ||
2020 | return err; | |
2021 | } | |
2022 | ||
2023 | /* Main ioctl() handler. | |
2024 | * Dispatch to tunnel or session helpers depending on the socket. | |
2025 | */ | |
2026 | static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd, | |
2027 | unsigned long arg) | |
2028 | { | |
2029 | struct sock *sk = sock->sk; | |
2030 | struct pppol2tp_session *session; | |
2031 | struct pppol2tp_tunnel *tunnel; | |
2032 | int err; | |
2033 | ||
2034 | if (!sk) | |
2035 | return 0; | |
2036 | ||
2037 | err = -EBADF; | |
2038 | if (sock_flag(sk, SOCK_DEAD) != 0) | |
2039 | goto end; | |
2040 | ||
2041 | err = -ENOTCONN; | |
2042 | if ((sk->sk_user_data == NULL) || | |
2043 | (!(sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)))) | |
2044 | goto end; | |
2045 | ||
2046 | /* Get session context from the socket */ | |
2047 | err = -EBADF; | |
2048 | session = pppol2tp_sock_to_session(sk); | |
2049 | if (session == NULL) | |
2050 | goto end; | |
2051 | ||
2052 | /* Special case: if session's session_id is zero, treat ioctl as a | |
2053 | * tunnel ioctl | |
2054 | */ | |
2055 | if ((session->tunnel_addr.s_session == 0) && | |
2056 | (session->tunnel_addr.d_session == 0)) { | |
2057 | err = -EBADF; | |
2058 | tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock); | |
2059 | if (tunnel == NULL) | |
24b95685 | 2060 | goto end_put_sess; |
3557baab JC |
2061 | |
2062 | err = pppol2tp_tunnel_ioctl(tunnel, cmd, arg); | |
24b95685 JC |
2063 | sock_put(session->tunnel_sock); |
2064 | goto end_put_sess; | |
3557baab JC |
2065 | } |
2066 | ||
2067 | err = pppol2tp_session_ioctl(session, cmd, arg); | |
2068 | ||
24b95685 JC |
2069 | end_put_sess: |
2070 | sock_put(sk); | |
3557baab JC |
2071 | end: |
2072 | return err; | |
2073 | } | |
2074 | ||
2075 | /***************************************************************************** | |
2076 | * setsockopt() / getsockopt() support. | |
2077 | * | |
2078 | * The PPPoX socket is created for L2TP sessions: tunnels have their own UDP | |
2079 | * sockets. In order to control kernel tunnel features, we allow userspace to | |
2080 | * create a special "tunnel" PPPoX socket which is used for control only. | |
2081 | * Tunnel PPPoX sockets have session_id == 0 and simply allow the user | |
2082 | * application to issue L2TP setsockopt(), getsockopt() and ioctl() calls. | |
2083 | *****************************************************************************/ | |
2084 | ||
2085 | /* Tunnel setsockopt() helper. | |
2086 | */ | |
2087 | static int pppol2tp_tunnel_setsockopt(struct sock *sk, | |
2088 | struct pppol2tp_tunnel *tunnel, | |
2089 | int optname, int val) | |
2090 | { | |
2091 | int err = 0; | |
2092 | ||
2093 | switch (optname) { | |
2094 | case PPPOL2TP_SO_DEBUG: | |
2095 | tunnel->debug = val; | |
2096 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2097 | "%s: set debug=%x\n", tunnel->name, tunnel->debug); | |
2098 | break; | |
2099 | ||
2100 | default: | |
2101 | err = -ENOPROTOOPT; | |
2102 | break; | |
2103 | } | |
2104 | ||
2105 | return err; | |
2106 | } | |
2107 | ||
2108 | /* Session setsockopt helper. | |
2109 | */ | |
2110 | static int pppol2tp_session_setsockopt(struct sock *sk, | |
2111 | struct pppol2tp_session *session, | |
2112 | int optname, int val) | |
2113 | { | |
2114 | int err = 0; | |
2115 | ||
2116 | switch (optname) { | |
2117 | case PPPOL2TP_SO_RECVSEQ: | |
2118 | if ((val != 0) && (val != 1)) { | |
2119 | err = -EINVAL; | |
2120 | break; | |
2121 | } | |
2122 | session->recv_seq = val ? -1 : 0; | |
2123 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2124 | "%s: set recv_seq=%d\n", session->name, | |
2125 | session->recv_seq); | |
2126 | break; | |
2127 | ||
2128 | case PPPOL2TP_SO_SENDSEQ: | |
2129 | if ((val != 0) && (val != 1)) { | |
2130 | err = -EINVAL; | |
2131 | break; | |
2132 | } | |
2133 | session->send_seq = val ? -1 : 0; | |
2134 | { | |
2135 | struct sock *ssk = session->sock; | |
2136 | struct pppox_sock *po = pppox_sk(ssk); | |
2137 | po->chan.hdrlen = val ? PPPOL2TP_L2TP_HDR_SIZE_SEQ : | |
2138 | PPPOL2TP_L2TP_HDR_SIZE_NOSEQ; | |
2139 | } | |
2140 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2141 | "%s: set send_seq=%d\n", session->name, session->send_seq); | |
2142 | break; | |
2143 | ||
2144 | case PPPOL2TP_SO_LNSMODE: | |
2145 | if ((val != 0) && (val != 1)) { | |
2146 | err = -EINVAL; | |
2147 | break; | |
2148 | } | |
2149 | session->lns_mode = val ? -1 : 0; | |
2150 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2151 | "%s: set lns_mode=%d\n", session->name, | |
2152 | session->lns_mode); | |
2153 | break; | |
2154 | ||
2155 | case PPPOL2TP_SO_DEBUG: | |
2156 | session->debug = val; | |
2157 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2158 | "%s: set debug=%x\n", session->name, session->debug); | |
2159 | break; | |
2160 | ||
2161 | case PPPOL2TP_SO_REORDERTO: | |
2162 | session->reorder_timeout = msecs_to_jiffies(val); | |
2163 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2164 | "%s: set reorder_timeout=%d\n", session->name, | |
2165 | session->reorder_timeout); | |
2166 | break; | |
2167 | ||
2168 | default: | |
2169 | err = -ENOPROTOOPT; | |
2170 | break; | |
2171 | } | |
2172 | ||
2173 | return err; | |
2174 | } | |
2175 | ||
2176 | /* Main setsockopt() entry point. | |
2177 | * Does API checks, then calls either the tunnel or session setsockopt | |
2178 | * handler, according to whether the PPPoL2TP socket is a for a regular | |
2179 | * session or the special tunnel type. | |
2180 | */ | |
2181 | static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, | |
2182 | char __user *optval, int optlen) | |
2183 | { | |
2184 | struct sock *sk = sock->sk; | |
2185 | struct pppol2tp_session *session = sk->sk_user_data; | |
2186 | struct pppol2tp_tunnel *tunnel; | |
2187 | int val; | |
2188 | int err; | |
2189 | ||
2190 | if (level != SOL_PPPOL2TP) | |
2191 | return udp_prot.setsockopt(sk, level, optname, optval, optlen); | |
2192 | ||
2193 | if (optlen < sizeof(int)) | |
2194 | return -EINVAL; | |
2195 | ||
2196 | if (get_user(val, (int __user *)optval)) | |
2197 | return -EFAULT; | |
2198 | ||
2199 | err = -ENOTCONN; | |
2200 | if (sk->sk_user_data == NULL) | |
2201 | goto end; | |
2202 | ||
2203 | /* Get session context from the socket */ | |
2204 | err = -EBADF; | |
2205 | session = pppol2tp_sock_to_session(sk); | |
2206 | if (session == NULL) | |
2207 | goto end; | |
2208 | ||
2209 | /* Special case: if session_id == 0x0000, treat as operation on tunnel | |
2210 | */ | |
2211 | if ((session->tunnel_addr.s_session == 0) && | |
2212 | (session->tunnel_addr.d_session == 0)) { | |
2213 | err = -EBADF; | |
2214 | tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock); | |
2215 | if (tunnel == NULL) | |
24b95685 | 2216 | goto end_put_sess; |
3557baab JC |
2217 | |
2218 | err = pppol2tp_tunnel_setsockopt(sk, tunnel, optname, val); | |
24b95685 | 2219 | sock_put(session->tunnel_sock); |
3557baab JC |
2220 | } else |
2221 | err = pppol2tp_session_setsockopt(sk, session, optname, val); | |
2222 | ||
2223 | err = 0; | |
2224 | ||
24b95685 JC |
2225 | end_put_sess: |
2226 | sock_put(sk); | |
3557baab JC |
2227 | end: |
2228 | return err; | |
2229 | } | |
2230 | ||
2231 | /* Tunnel getsockopt helper. Called with sock locked. | |
2232 | */ | |
2233 | static int pppol2tp_tunnel_getsockopt(struct sock *sk, | |
2234 | struct pppol2tp_tunnel *tunnel, | |
af3b162a | 2235 | int optname, int *val) |
3557baab JC |
2236 | { |
2237 | int err = 0; | |
2238 | ||
2239 | switch (optname) { | |
2240 | case PPPOL2TP_SO_DEBUG: | |
2241 | *val = tunnel->debug; | |
2242 | PRINTK(tunnel->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2243 | "%s: get debug=%x\n", tunnel->name, tunnel->debug); | |
2244 | break; | |
2245 | ||
2246 | default: | |
2247 | err = -ENOPROTOOPT; | |
2248 | break; | |
2249 | } | |
2250 | ||
2251 | return err; | |
2252 | } | |
2253 | ||
2254 | /* Session getsockopt helper. Called with sock locked. | |
2255 | */ | |
2256 | static int pppol2tp_session_getsockopt(struct sock *sk, | |
2257 | struct pppol2tp_session *session, | |
af3b162a | 2258 | int optname, int *val) |
3557baab JC |
2259 | { |
2260 | int err = 0; | |
2261 | ||
2262 | switch (optname) { | |
2263 | case PPPOL2TP_SO_RECVSEQ: | |
2264 | *val = session->recv_seq; | |
2265 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2266 | "%s: get recv_seq=%d\n", session->name, *val); | |
2267 | break; | |
2268 | ||
2269 | case PPPOL2TP_SO_SENDSEQ: | |
2270 | *val = session->send_seq; | |
2271 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2272 | "%s: get send_seq=%d\n", session->name, *val); | |
2273 | break; | |
2274 | ||
2275 | case PPPOL2TP_SO_LNSMODE: | |
2276 | *val = session->lns_mode; | |
2277 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2278 | "%s: get lns_mode=%d\n", session->name, *val); | |
2279 | break; | |
2280 | ||
2281 | case PPPOL2TP_SO_DEBUG: | |
2282 | *val = session->debug; | |
2283 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2284 | "%s: get debug=%d\n", session->name, *val); | |
2285 | break; | |
2286 | ||
2287 | case PPPOL2TP_SO_REORDERTO: | |
2288 | *val = (int) jiffies_to_msecs(session->reorder_timeout); | |
2289 | PRINTK(session->debug, PPPOL2TP_MSG_CONTROL, KERN_INFO, | |
2290 | "%s: get reorder_timeout=%d\n", session->name, *val); | |
2291 | break; | |
2292 | ||
2293 | default: | |
2294 | err = -ENOPROTOOPT; | |
2295 | } | |
2296 | ||
2297 | return err; | |
2298 | } | |
2299 | ||
2300 | /* Main getsockopt() entry point. | |
2301 | * Does API checks, then calls either the tunnel or session getsockopt | |
2302 | * handler, according to whether the PPPoX socket is a for a regular session | |
2303 | * or the special tunnel type. | |
2304 | */ | |
2305 | static int pppol2tp_getsockopt(struct socket *sock, int level, | |
2306 | int optname, char __user *optval, int __user *optlen) | |
2307 | { | |
2308 | struct sock *sk = sock->sk; | |
2309 | struct pppol2tp_session *session = sk->sk_user_data; | |
2310 | struct pppol2tp_tunnel *tunnel; | |
2311 | int val, len; | |
2312 | int err; | |
2313 | ||
2314 | if (level != SOL_PPPOL2TP) | |
2315 | return udp_prot.getsockopt(sk, level, optname, optval, optlen); | |
2316 | ||
2317 | if (get_user(len, (int __user *) optlen)) | |
2318 | return -EFAULT; | |
2319 | ||
2320 | len = min_t(unsigned int, len, sizeof(int)); | |
2321 | ||
2322 | if (len < 0) | |
2323 | return -EINVAL; | |
2324 | ||
2325 | err = -ENOTCONN; | |
2326 | if (sk->sk_user_data == NULL) | |
2327 | goto end; | |
2328 | ||
2329 | /* Get the session context */ | |
2330 | err = -EBADF; | |
2331 | session = pppol2tp_sock_to_session(sk); | |
2332 | if (session == NULL) | |
2333 | goto end; | |
2334 | ||
2335 | /* Special case: if session_id == 0x0000, treat as operation on tunnel */ | |
2336 | if ((session->tunnel_addr.s_session == 0) && | |
2337 | (session->tunnel_addr.d_session == 0)) { | |
2338 | err = -EBADF; | |
2339 | tunnel = pppol2tp_sock_to_tunnel(session->tunnel_sock); | |
2340 | if (tunnel == NULL) | |
24b95685 | 2341 | goto end_put_sess; |
3557baab JC |
2342 | |
2343 | err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); | |
24b95685 | 2344 | sock_put(session->tunnel_sock); |
3557baab JC |
2345 | } else |
2346 | err = pppol2tp_session_getsockopt(sk, session, optname, &val); | |
2347 | ||
2348 | err = -EFAULT; | |
2349 | if (put_user(len, (int __user *) optlen)) | |
24b95685 | 2350 | goto end_put_sess; |
3557baab JC |
2351 | |
2352 | if (copy_to_user((void __user *) optval, &val, len)) | |
24b95685 | 2353 | goto end_put_sess; |
3557baab JC |
2354 | |
2355 | err = 0; | |
24b95685 JC |
2356 | |
2357 | end_put_sess: | |
2358 | sock_put(sk); | |
3557baab JC |
2359 | end: |
2360 | return err; | |
2361 | } | |
2362 | ||
2363 | /***************************************************************************** | |
2364 | * /proc filesystem for debug | |
2365 | *****************************************************************************/ | |
2366 | ||
2367 | #ifdef CONFIG_PROC_FS | |
2368 | ||
2369 | #include <linux/seq_file.h> | |
2370 | ||
2371 | struct pppol2tp_seq_data { | |
cbec6605 | 2372 | struct seq_net_private p; |
4e9fb801 CG |
2373 | struct pppol2tp_tunnel *tunnel; /* current tunnel */ |
2374 | struct pppol2tp_session *session; /* NULL means get first session in tunnel */ | |
3557baab JC |
2375 | }; |
2376 | ||
2377 | static struct pppol2tp_session *next_session(struct pppol2tp_tunnel *tunnel, struct pppol2tp_session *curr) | |
2378 | { | |
2379 | struct pppol2tp_session *session = NULL; | |
2380 | struct hlist_node *walk; | |
2381 | int found = 0; | |
2382 | int next = 0; | |
2383 | int i; | |
2384 | ||
cf3752e2 | 2385 | read_lock_bh(&tunnel->hlist_lock); |
3557baab JC |
2386 | for (i = 0; i < PPPOL2TP_HASH_SIZE; i++) { |
2387 | hlist_for_each_entry(session, walk, &tunnel->session_hlist[i], hlist) { | |
2388 | if (curr == NULL) { | |
2389 | found = 1; | |
2390 | goto out; | |
2391 | } | |
2392 | if (session == curr) { | |
2393 | next = 1; | |
2394 | continue; | |
2395 | } | |
2396 | if (next) { | |
2397 | found = 1; | |
2398 | goto out; | |
2399 | } | |
2400 | } | |
2401 | } | |
2402 | out: | |
cf3752e2 | 2403 | read_unlock_bh(&tunnel->hlist_lock); |
3557baab JC |
2404 | if (!found) |
2405 | session = NULL; | |
2406 | ||
2407 | return session; | |
2408 | } | |
2409 | ||
4e9fb801 CG |
2410 | static struct pppol2tp_tunnel *next_tunnel(struct pppol2tp_net *pn, |
2411 | struct pppol2tp_tunnel *curr) | |
3557baab JC |
2412 | { |
2413 | struct pppol2tp_tunnel *tunnel = NULL; | |
2414 | ||
4e9fb801 CG |
2415 | read_lock_bh(&pn->pppol2tp_tunnel_list_lock); |
2416 | if (list_is_last(&curr->list, &pn->pppol2tp_tunnel_list)) { | |
3557baab JC |
2417 | goto out; |
2418 | } | |
2419 | tunnel = list_entry(curr->list.next, struct pppol2tp_tunnel, list); | |
2420 | out: | |
4e9fb801 | 2421 | read_unlock_bh(&pn->pppol2tp_tunnel_list_lock); |
3557baab JC |
2422 | |
2423 | return tunnel; | |
2424 | } | |
2425 | ||
2426 | static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs) | |
2427 | { | |
2428 | struct pppol2tp_seq_data *pd = SEQ_START_TOKEN; | |
4e9fb801 | 2429 | struct pppol2tp_net *pn; |
3557baab JC |
2430 | loff_t pos = *offs; |
2431 | ||
2432 | if (!pos) | |
2433 | goto out; | |
2434 | ||
2435 | BUG_ON(m->private == NULL); | |
2436 | pd = m->private; | |
cbec6605 | 2437 | pn = pppol2tp_pernet(seq_file_net(m)); |
3557baab JC |
2438 | |
2439 | if (pd->tunnel == NULL) { | |
4e9fb801 CG |
2440 | if (!list_empty(&pn->pppol2tp_tunnel_list)) |
2441 | pd->tunnel = list_entry(pn->pppol2tp_tunnel_list.next, struct pppol2tp_tunnel, list); | |
3557baab JC |
2442 | } else { |
2443 | pd->session = next_session(pd->tunnel, pd->session); | |
2444 | if (pd->session == NULL) { | |
4e9fb801 | 2445 | pd->tunnel = next_tunnel(pn, pd->tunnel); |
3557baab JC |
2446 | } |
2447 | } | |
2448 | ||
2449 | /* NULL tunnel and session indicates end of list */ | |
2450 | if ((pd->tunnel == NULL) && (pd->session == NULL)) | |
2451 | pd = NULL; | |
2452 | ||
2453 | out: | |
2454 | return pd; | |
2455 | } | |
2456 | ||
2457 | static void *pppol2tp_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
2458 | { | |
2459 | (*pos)++; | |
2460 | return NULL; | |
2461 | } | |
2462 | ||
2463 | static void pppol2tp_seq_stop(struct seq_file *p, void *v) | |
2464 | { | |
2465 | /* nothing to do */ | |
2466 | } | |
2467 | ||
2468 | static void pppol2tp_seq_tunnel_show(struct seq_file *m, void *v) | |
2469 | { | |
2470 | struct pppol2tp_tunnel *tunnel = v; | |
2471 | ||
2472 | seq_printf(m, "\nTUNNEL '%s', %c %d\n", | |
2473 | tunnel->name, | |
2474 | (tunnel == tunnel->sock->sk_user_data) ? 'Y':'N', | |
2475 | atomic_read(&tunnel->ref_count) - 1); | |
2476 | seq_printf(m, " %08x %llu/%llu/%llu %llu/%llu/%llu\n", | |
2477 | tunnel->debug, | |
0efeaa33 AM |
2478 | (unsigned long long)tunnel->stats.tx_packets, |
2479 | (unsigned long long)tunnel->stats.tx_bytes, | |
2480 | (unsigned long long)tunnel->stats.tx_errors, | |
2481 | (unsigned long long)tunnel->stats.rx_packets, | |
2482 | (unsigned long long)tunnel->stats.rx_bytes, | |
2483 | (unsigned long long)tunnel->stats.rx_errors); | |
3557baab JC |
2484 | } |
2485 | ||
2486 | static void pppol2tp_seq_session_show(struct seq_file *m, void *v) | |
2487 | { | |
2488 | struct pppol2tp_session *session = v; | |
2489 | ||
2490 | seq_printf(m, " SESSION '%s' %08X/%d %04X/%04X -> " | |
2491 | "%04X/%04X %d %c\n", | |
2492 | session->name, | |
2493 | ntohl(session->tunnel_addr.addr.sin_addr.s_addr), | |
2494 | ntohs(session->tunnel_addr.addr.sin_port), | |
2495 | session->tunnel_addr.s_tunnel, | |
2496 | session->tunnel_addr.s_session, | |
2497 | session->tunnel_addr.d_tunnel, | |
2498 | session->tunnel_addr.d_session, | |
2499 | session->sock->sk_state, | |
2500 | (session == session->sock->sk_user_data) ? | |
2501 | 'Y' : 'N'); | |
2502 | seq_printf(m, " %d/%d/%c/%c/%s %08x %u\n", | |
2503 | session->mtu, session->mru, | |
2504 | session->recv_seq ? 'R' : '-', | |
2505 | session->send_seq ? 'S' : '-', | |
2506 | session->lns_mode ? "LNS" : "LAC", | |
2507 | session->debug, | |
2508 | jiffies_to_msecs(session->reorder_timeout)); | |
2509 | seq_printf(m, " %hu/%hu %llu/%llu/%llu %llu/%llu/%llu\n", | |
2510 | session->nr, session->ns, | |
0efeaa33 AM |
2511 | (unsigned long long)session->stats.tx_packets, |
2512 | (unsigned long long)session->stats.tx_bytes, | |
2513 | (unsigned long long)session->stats.tx_errors, | |
2514 | (unsigned long long)session->stats.rx_packets, | |
2515 | (unsigned long long)session->stats.rx_bytes, | |
2516 | (unsigned long long)session->stats.rx_errors); | |
3557baab JC |
2517 | } |
2518 | ||
2519 | static int pppol2tp_seq_show(struct seq_file *m, void *v) | |
2520 | { | |
2521 | struct pppol2tp_seq_data *pd = v; | |
2522 | ||
2523 | /* display header on line 1 */ | |
2524 | if (v == SEQ_START_TOKEN) { | |
2525 | seq_puts(m, "PPPoL2TP driver info, " PPPOL2TP_DRV_VERSION "\n"); | |
2526 | seq_puts(m, "TUNNEL name, user-data-ok session-count\n"); | |
2527 | seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
2528 | seq_puts(m, " SESSION name, addr/port src-tid/sid " | |
2529 | "dest-tid/sid state user-data-ok\n"); | |
2530 | seq_puts(m, " mtu/mru/rcvseq/sendseq/lns debug reorderto\n"); | |
2531 | seq_puts(m, " nr/ns tx-pkts/bytes/errs rx-pkts/bytes/errs\n"); | |
2532 | goto out; | |
2533 | } | |
2534 | ||
2535 | /* Show the tunnel or session context. | |
2536 | */ | |
2537 | if (pd->session == NULL) | |
2538 | pppol2tp_seq_tunnel_show(m, pd->tunnel); | |
2539 | else | |
2540 | pppol2tp_seq_session_show(m, pd->session); | |
2541 | ||
2542 | out: | |
2543 | return 0; | |
2544 | } | |
2545 | ||
4101dec9 | 2546 | static const struct seq_operations pppol2tp_seq_ops = { |
3557baab JC |
2547 | .start = pppol2tp_seq_start, |
2548 | .next = pppol2tp_seq_next, | |
2549 | .stop = pppol2tp_seq_stop, | |
2550 | .show = pppol2tp_seq_show, | |
2551 | }; | |
2552 | ||
2553 | /* Called when our /proc file is opened. We allocate data for use when | |
2554 | * iterating our tunnel / session contexts and store it in the private | |
2555 | * data of the seq_file. | |
2556 | */ | |
2557 | static int pppol2tp_proc_open(struct inode *inode, struct file *file) | |
2558 | { | |
cbec6605 AD |
2559 | return seq_open_net(inode, file, &pppol2tp_seq_ops, |
2560 | sizeof(struct pppol2tp_seq_data)); | |
3557baab JC |
2561 | } |
2562 | ||
4101dec9 | 2563 | static const struct file_operations pppol2tp_proc_fops = { |
3557baab JC |
2564 | .owner = THIS_MODULE, |
2565 | .open = pppol2tp_proc_open, | |
2566 | .read = seq_read, | |
2567 | .llseek = seq_lseek, | |
cbec6605 | 2568 | .release = seq_release_net, |
3557baab JC |
2569 | }; |
2570 | ||
3557baab JC |
2571 | #endif /* CONFIG_PROC_FS */ |
2572 | ||
2573 | /***************************************************************************** | |
2574 | * Init and cleanup | |
2575 | *****************************************************************************/ | |
2576 | ||
2577 | static struct proto_ops pppol2tp_ops = { | |
2578 | .family = AF_PPPOX, | |
2579 | .owner = THIS_MODULE, | |
2580 | .release = pppol2tp_release, | |
2581 | .bind = sock_no_bind, | |
2582 | .connect = pppol2tp_connect, | |
2583 | .socketpair = sock_no_socketpair, | |
2584 | .accept = sock_no_accept, | |
2585 | .getname = pppol2tp_getname, | |
2586 | .poll = datagram_poll, | |
2587 | .listen = sock_no_listen, | |
2588 | .shutdown = sock_no_shutdown, | |
2589 | .setsockopt = pppol2tp_setsockopt, | |
2590 | .getsockopt = pppol2tp_getsockopt, | |
2591 | .sendmsg = pppol2tp_sendmsg, | |
2592 | .recvmsg = pppol2tp_recvmsg, | |
2593 | .mmap = sock_no_mmap, | |
2594 | .ioctl = pppox_ioctl, | |
2595 | }; | |
2596 | ||
2597 | static struct pppox_proto pppol2tp_proto = { | |
2598 | .create = pppol2tp_create, | |
2599 | .ioctl = pppol2tp_ioctl | |
2600 | }; | |
2601 | ||
4e9fb801 CG |
2602 | static __net_init int pppol2tp_init_net(struct net *net) |
2603 | { | |
2604 | struct pppol2tp_net *pn; | |
2605 | struct proc_dir_entry *pde; | |
2606 | int err; | |
2607 | ||
2608 | pn = kzalloc(sizeof(*pn), GFP_KERNEL); | |
2609 | if (!pn) | |
2610 | return -ENOMEM; | |
2611 | ||
2612 | INIT_LIST_HEAD(&pn->pppol2tp_tunnel_list); | |
2613 | rwlock_init(&pn->pppol2tp_tunnel_list_lock); | |
2614 | ||
2615 | err = net_assign_generic(net, pppol2tp_net_id, pn); | |
2616 | if (err) | |
2617 | goto out; | |
2618 | ||
2619 | pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops); | |
2620 | #ifdef CONFIG_PROC_FS | |
2621 | if (!pde) { | |
2622 | err = -ENOMEM; | |
2623 | goto out; | |
2624 | } | |
2625 | #endif | |
2626 | ||
2627 | return 0; | |
2628 | ||
2629 | out: | |
2630 | kfree(pn); | |
2631 | return err; | |
2632 | } | |
2633 | ||
2634 | static __net_exit void pppol2tp_exit_net(struct net *net) | |
2635 | { | |
2636 | struct pppoe_net *pn; | |
2637 | ||
2638 | proc_net_remove(net, "pppol2tp"); | |
2639 | pn = net_generic(net, pppol2tp_net_id); | |
2640 | /* | |
2641 | * if someone has cached our net then | |
2642 | * further net_generic call will return NULL | |
2643 | */ | |
2644 | net_assign_generic(net, pppol2tp_net_id, NULL); | |
2645 | kfree(pn); | |
2646 | } | |
2647 | ||
0012985d | 2648 | static struct pernet_operations pppol2tp_net_ops = { |
4e9fb801 CG |
2649 | .init = pppol2tp_init_net, |
2650 | .exit = pppol2tp_exit_net, | |
2651 | }; | |
2652 | ||
3557baab JC |
2653 | static int __init pppol2tp_init(void) |
2654 | { | |
2655 | int err; | |
2656 | ||
2657 | err = proto_register(&pppol2tp_sk_proto, 0); | |
2658 | if (err) | |
2659 | goto out; | |
2660 | err = register_pppox_proto(PX_PROTO_OL2TP, &pppol2tp_proto); | |
2661 | if (err) | |
2662 | goto out_unregister_pppol2tp_proto; | |
2663 | ||
4e9fb801 CG |
2664 | err = register_pernet_gen_device(&pppol2tp_net_id, &pppol2tp_net_ops); |
2665 | if (err) | |
3557baab | 2666 | goto out_unregister_pppox_proto; |
4e9fb801 | 2667 | |
3557baab JC |
2668 | printk(KERN_INFO "PPPoL2TP kernel driver, %s\n", |
2669 | PPPOL2TP_DRV_VERSION); | |
2670 | ||
2671 | out: | |
2672 | return err; | |
3557baab JC |
2673 | out_unregister_pppox_proto: |
2674 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
2675 | out_unregister_pppol2tp_proto: | |
2676 | proto_unregister(&pppol2tp_sk_proto); | |
2677 | goto out; | |
2678 | } | |
2679 | ||
2680 | static void __exit pppol2tp_exit(void) | |
2681 | { | |
2682 | unregister_pppox_proto(PX_PROTO_OL2TP); | |
3557baab JC |
2683 | proto_unregister(&pppol2tp_sk_proto); |
2684 | } | |
2685 | ||
2686 | module_init(pppol2tp_init); | |
2687 | module_exit(pppol2tp_exit); | |
2688 | ||
2450022a | 2689 | MODULE_AUTHOR("Martijn van Oosterhout <kleptog@svana.org>, " |
3557baab JC |
2690 | "James Chapman <jchapman@katalix.com>"); |
2691 | MODULE_DESCRIPTION("PPP over L2TP over UDP"); | |
2692 | MODULE_LICENSE("GPL"); | |
2693 | MODULE_VERSION(PPPOL2TP_DRV_VERSION); |