Commit | Line | Data |
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1da177e4 LT |
1 | /** -*- linux-c -*- *********************************************************** |
2 | * Linux PPP over Ethernet (PPPoX/PPPoE) Sockets | |
3 | * | |
4 | * PPPoX --- Generic PPP encapsulation socket family | |
5 | * PPPoE --- PPP over Ethernet (RFC 2516) | |
6 | * | |
7 | * | |
8 | * Version: 0.7.0 | |
9 | * | |
90719dbe FZ |
10 | * 070228 : Fix to allow multiple sessions with same remote MAC and same |
11 | * session id by including the local device ifindex in the | |
12 | * tuple identifying a session. This also ensures packets can't | |
13 | * be injected into a session from interfaces other than the one | |
14 | * specified by userspace. Florian Zumbiehl <florz@florz.de> | |
15 | * (Oh, BTW, this one is YYMMDD, in case you were wondering ...) | |
1da177e4 LT |
16 | * 220102 : Fix module use count on failure in pppoe_create, pppox_sk -acme |
17 | * 030700 : Fixed connect logic to allow for disconnect. | |
18 | * 270700 : Fixed potential SMP problems; we must protect against | |
19 | * simultaneous invocation of ppp_input | |
20 | * and ppp_unregister_channel. | |
21 | * 040800 : Respect reference count mechanisms on net-devices. | |
22 | * 200800 : fix kfree(skb) in pppoe_rcv (acme) | |
23 | * Module reference count is decremented in the right spot now, | |
24 | * guards against sock_put not actually freeing the sk | |
25 | * in pppoe_release. | |
26 | * 051000 : Initialization cleanup. | |
27 | * 111100 : Fix recvmsg. | |
28 | * 050101 : Fix PADT procesing. | |
29 | * 140501 : Use pppoe_rcv_core to handle all backlog. (Alexey) | |
30 | * 170701 : Do not lock_sock with rwlock held. (DaveM) | |
31 | * Ignore discovery frames if user has socket | |
32 | * locked. (DaveM) | |
33 | * Ignore return value of dev_queue_xmit in __pppoe_xmit | |
34 | * or else we may kfree an SKB twice. (DaveM) | |
35 | * 190701 : When doing copies of skb's in __pppoe_xmit, always delete | |
36 | * the original skb that was passed in on success, never on | |
37 | * failure. Delete the copy of the skb on failure to avoid | |
38 | * a memory leak. | |
39 | * 081001 : Misc. cleanup (licence string, non-blocking, prevent | |
40 | * reference of device on close). | |
41 | * 121301 : New ppp channels interface; cannot unregister a channel | |
42 | * from interrupts. Thus, we mark the socket as a ZOMBIE | |
43 | * and do the unregistration later. | |
44 | * 081002 : seq_file support for proc stuff -acme | |
45 | * 111602 : Merge all 2.4 fixes into 2.5/2.6 tree. Label 2.5/2.6 | |
46 | * as version 0.7. Spacing cleanup. | |
47 | * Author: Michal Ostrowski <mostrows@speakeasy.net> | |
48 | * Contributors: | |
49 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
50 | * David S. Miller (davem@redhat.com) | |
51 | * | |
52 | * License: | |
53 | * This program is free software; you can redistribute it and/or | |
54 | * modify it under the terms of the GNU General Public License | |
55 | * as published by the Free Software Foundation; either version | |
56 | * 2 of the License, or (at your option) any later version. | |
57 | * | |
58 | */ | |
59 | ||
60 | #include <linux/string.h> | |
61 | #include <linux/module.h> | |
62 | #include <linux/kernel.h> | |
63 | #include <linux/slab.h> | |
64 | #include <linux/errno.h> | |
65 | #include <linux/netdevice.h> | |
66 | #include <linux/net.h> | |
67 | #include <linux/inetdevice.h> | |
68 | #include <linux/etherdevice.h> | |
69 | #include <linux/skbuff.h> | |
70 | #include <linux/init.h> | |
71 | #include <linux/if_ether.h> | |
72 | #include <linux/if_pppox.h> | |
73 | #include <linux/ppp_channel.h> | |
74 | #include <linux/ppp_defs.h> | |
75 | #include <linux/if_ppp.h> | |
76 | #include <linux/notifier.h> | |
77 | #include <linux/file.h> | |
78 | #include <linux/proc_fs.h> | |
79 | #include <linux/seq_file.h> | |
80 | ||
81 | #include <net/sock.h> | |
82 | ||
83 | #include <asm/uaccess.h> | |
84 | ||
85 | #define PPPOE_HASH_BITS 4 | |
86 | #define PPPOE_HASH_SIZE (1<<PPPOE_HASH_BITS) | |
87 | ||
88 | static struct ppp_channel_ops pppoe_chan_ops; | |
89 | ||
90 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); | |
91 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
92 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb); | |
93 | ||
17ba15fb | 94 | static const struct proto_ops pppoe_ops; |
1da177e4 LT |
95 | static DEFINE_RWLOCK(pppoe_hash_lock); |
96 | ||
97 | static struct ppp_channel_ops pppoe_chan_ops; | |
98 | ||
99 | static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b) | |
100 | { | |
101 | return (a->sid == b->sid && | |
102 | (memcmp(a->remote, b->remote, ETH_ALEN) == 0)); | |
103 | } | |
104 | ||
105 | static inline int cmp_addr(struct pppoe_addr *a, unsigned long sid, char *addr) | |
106 | { | |
107 | return (a->sid == sid && | |
108 | (memcmp(a->remote,addr,ETH_ALEN) == 0)); | |
109 | } | |
110 | ||
111 | static int hash_item(unsigned long sid, unsigned char *addr) | |
112 | { | |
113 | char hash = 0; | |
114 | int i, j; | |
115 | ||
116 | for (i = 0; i < ETH_ALEN ; ++i) { | |
117 | for (j = 0; j < 8/PPPOE_HASH_BITS ; ++j) { | |
118 | hash ^= addr[i] >> ( j * PPPOE_HASH_BITS ); | |
119 | } | |
120 | } | |
121 | ||
122 | for (i = 0; i < (sizeof(unsigned long)*8) / PPPOE_HASH_BITS ; ++i) | |
123 | hash ^= sid >> (i*PPPOE_HASH_BITS); | |
124 | ||
125 | return hash & ( PPPOE_HASH_SIZE - 1 ); | |
126 | } | |
127 | ||
128 | /* zeroed because its in .bss */ | |
129 | static struct pppox_sock *item_hash_table[PPPOE_HASH_SIZE]; | |
130 | ||
131 | /********************************************************************** | |
132 | * | |
133 | * Set/get/delete/rehash items (internal versions) | |
134 | * | |
135 | **********************************************************************/ | |
90719dbe | 136 | static struct pppox_sock *__get_item(unsigned long sid, unsigned char *addr, int ifindex) |
1da177e4 LT |
137 | { |
138 | int hash = hash_item(sid, addr); | |
139 | struct pppox_sock *ret; | |
140 | ||
141 | ret = item_hash_table[hash]; | |
142 | ||
6f30e186 | 143 | while (ret && !(cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex)) |
1da177e4 LT |
144 | ret = ret->next; |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
149 | static int __set_item(struct pppox_sock *po) | |
150 | { | |
151 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
152 | struct pppox_sock *ret; | |
153 | ||
154 | ret = item_hash_table[hash]; | |
155 | while (ret) { | |
6f30e186 | 156 | if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && ret->pppoe_ifindex == po->pppoe_ifindex) |
1da177e4 LT |
157 | return -EALREADY; |
158 | ||
159 | ret = ret->next; | |
160 | } | |
161 | ||
90719dbe FZ |
162 | po->next = item_hash_table[hash]; |
163 | item_hash_table[hash] = po; | |
1da177e4 LT |
164 | |
165 | return 0; | |
166 | } | |
167 | ||
90719dbe | 168 | static struct pppox_sock *__delete_item(unsigned long sid, char *addr, int ifindex) |
1da177e4 LT |
169 | { |
170 | int hash = hash_item(sid, addr); | |
171 | struct pppox_sock *ret, **src; | |
172 | ||
173 | ret = item_hash_table[hash]; | |
174 | src = &item_hash_table[hash]; | |
175 | ||
176 | while (ret) { | |
6f30e186 | 177 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex) { |
1da177e4 LT |
178 | *src = ret->next; |
179 | break; | |
180 | } | |
181 | ||
182 | src = &ret->next; | |
183 | ret = ret->next; | |
184 | } | |
185 | ||
186 | return ret; | |
187 | } | |
188 | ||
189 | /********************************************************************** | |
190 | * | |
191 | * Set/get/delete/rehash items | |
192 | * | |
193 | **********************************************************************/ | |
194 | static inline struct pppox_sock *get_item(unsigned long sid, | |
90719dbe | 195 | unsigned char *addr, int ifindex) |
1da177e4 LT |
196 | { |
197 | struct pppox_sock *po; | |
198 | ||
199 | read_lock_bh(&pppoe_hash_lock); | |
90719dbe | 200 | po = __get_item(sid, addr, ifindex); |
1da177e4 LT |
201 | if (po) |
202 | sock_hold(sk_pppox(po)); | |
203 | read_unlock_bh(&pppoe_hash_lock); | |
204 | ||
205 | return po; | |
206 | } | |
207 | ||
208 | static inline struct pppox_sock *get_item_by_addr(struct sockaddr_pppox *sp) | |
209 | { | |
90719dbe FZ |
210 | struct net_device *dev = NULL; |
211 | int ifindex; | |
212 | ||
213 | dev = dev_get_by_name(sp->sa_addr.pppoe.dev); | |
214 | if(!dev) | |
215 | return NULL; | |
216 | ifindex = dev->ifindex; | |
217 | dev_put(dev); | |
218 | return get_item(sp->sa_addr.pppoe.sid, sp->sa_addr.pppoe.remote, ifindex); | |
1da177e4 LT |
219 | } |
220 | ||
221 | static inline int set_item(struct pppox_sock *po) | |
222 | { | |
223 | int i; | |
224 | ||
225 | if (!po) | |
226 | return -EINVAL; | |
227 | ||
228 | write_lock_bh(&pppoe_hash_lock); | |
229 | i = __set_item(po); | |
230 | write_unlock_bh(&pppoe_hash_lock); | |
231 | ||
232 | return i; | |
233 | } | |
234 | ||
90719dbe | 235 | static inline struct pppox_sock *delete_item(unsigned long sid, char *addr, int ifindex) |
1da177e4 LT |
236 | { |
237 | struct pppox_sock *ret; | |
238 | ||
239 | write_lock_bh(&pppoe_hash_lock); | |
90719dbe | 240 | ret = __delete_item(sid, addr, ifindex); |
1da177e4 LT |
241 | write_unlock_bh(&pppoe_hash_lock); |
242 | ||
243 | return ret; | |
244 | } | |
245 | ||
246 | ||
247 | ||
248 | /*************************************************************************** | |
249 | * | |
250 | * Handler for device events. | |
251 | * Certain device events require that sockets be unconnected. | |
252 | * | |
253 | **************************************************************************/ | |
254 | ||
255 | static void pppoe_flush_dev(struct net_device *dev) | |
256 | { | |
257 | int hash; | |
258 | ||
259 | BUG_ON(dev == NULL); | |
260 | ||
261 | read_lock_bh(&pppoe_hash_lock); | |
262 | for (hash = 0; hash < PPPOE_HASH_SIZE; hash++) { | |
263 | struct pppox_sock *po = item_hash_table[hash]; | |
264 | ||
265 | while (po != NULL) { | |
266 | if (po->pppoe_dev == dev) { | |
267 | struct sock *sk = sk_pppox(po); | |
268 | ||
269 | sock_hold(sk); | |
270 | po->pppoe_dev = NULL; | |
271 | ||
272 | /* We hold a reference to SK, now drop the | |
273 | * hash table lock so that we may attempt | |
274 | * to lock the socket (which can sleep). | |
275 | */ | |
276 | read_unlock_bh(&pppoe_hash_lock); | |
277 | ||
278 | lock_sock(sk); | |
279 | ||
280 | if (sk->sk_state & | |
281 | (PPPOX_CONNECTED | PPPOX_BOUND)) { | |
282 | pppox_unbind_sock(sk); | |
283 | dev_put(dev); | |
284 | sk->sk_state = PPPOX_ZOMBIE; | |
285 | sk->sk_state_change(sk); | |
286 | } | |
287 | ||
288 | release_sock(sk); | |
289 | ||
290 | sock_put(sk); | |
291 | ||
292 | read_lock_bh(&pppoe_hash_lock); | |
293 | ||
294 | /* Now restart from the beginning of this | |
295 | * hash chain. We always NULL out pppoe_dev | |
296 | * so we are guaranteed to make forward | |
297 | * progress. | |
298 | */ | |
299 | po = item_hash_table[hash]; | |
300 | continue; | |
301 | } | |
302 | po = po->next; | |
303 | } | |
304 | } | |
305 | read_unlock_bh(&pppoe_hash_lock); | |
306 | } | |
307 | ||
308 | static int pppoe_device_event(struct notifier_block *this, | |
309 | unsigned long event, void *ptr) | |
310 | { | |
311 | struct net_device *dev = (struct net_device *) ptr; | |
312 | ||
313 | /* Only look at sockets that are using this specific device. */ | |
314 | switch (event) { | |
315 | case NETDEV_CHANGEMTU: | |
316 | /* A change in mtu is a bad thing, requiring | |
317 | * LCP re-negotiation. | |
318 | */ | |
319 | ||
320 | case NETDEV_GOING_DOWN: | |
321 | case NETDEV_DOWN: | |
322 | /* Find every socket on this device and kill it. */ | |
323 | pppoe_flush_dev(dev); | |
324 | break; | |
325 | ||
326 | default: | |
327 | break; | |
328 | }; | |
329 | ||
330 | return NOTIFY_DONE; | |
331 | } | |
332 | ||
333 | ||
334 | static struct notifier_block pppoe_notifier = { | |
335 | .notifier_call = pppoe_device_event, | |
336 | }; | |
337 | ||
338 | ||
339 | /************************************************************************ | |
340 | * | |
341 | * Do the real work of receiving a PPPoE Session frame. | |
342 | * | |
343 | ***********************************************************************/ | |
344 | static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) | |
345 | { | |
346 | struct pppox_sock *po = pppox_sk(sk); | |
347 | struct pppox_sock *relay_po = NULL; | |
348 | ||
349 | if (sk->sk_state & PPPOX_BOUND) { | |
797659fb | 350 | struct pppoe_hdr *ph = pppoe_hdr(skb); |
1da177e4 | 351 | int len = ntohs(ph->length); |
cbb042f9 | 352 | skb_pull_rcsum(skb, sizeof(struct pppoe_hdr)); |
1da177e4 LT |
353 | if (pskb_trim_rcsum(skb, len)) |
354 | goto abort_kfree; | |
355 | ||
356 | ppp_input(&po->chan, skb); | |
357 | } else if (sk->sk_state & PPPOX_RELAY) { | |
358 | relay_po = get_item_by_addr(&po->pppoe_relay); | |
359 | ||
360 | if (relay_po == NULL) | |
361 | goto abort_kfree; | |
362 | ||
363 | if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) | |
364 | goto abort_put; | |
365 | ||
366 | skb_pull(skb, sizeof(struct pppoe_hdr)); | |
367 | if (!__pppoe_xmit(sk_pppox(relay_po), skb)) | |
368 | goto abort_put; | |
369 | } else { | |
370 | if (sock_queue_rcv_skb(sk, skb)) | |
371 | goto abort_kfree; | |
372 | } | |
373 | ||
374 | return NET_RX_SUCCESS; | |
375 | ||
376 | abort_put: | |
377 | sock_put(sk_pppox(relay_po)); | |
378 | ||
379 | abort_kfree: | |
380 | kfree_skb(skb); | |
381 | return NET_RX_DROP; | |
382 | } | |
383 | ||
384 | /************************************************************************ | |
385 | * | |
386 | * Receive wrapper called in BH context. | |
387 | * | |
388 | ***********************************************************************/ | |
389 | static int pppoe_rcv(struct sk_buff *skb, | |
390 | struct net_device *dev, | |
f2ccd8fa DM |
391 | struct packet_type *pt, |
392 | struct net_device *orig_dev) | |
1da177e4 LT |
393 | |
394 | { | |
395 | struct pppoe_hdr *ph; | |
396 | struct pppox_sock *po; | |
1da177e4 LT |
397 | |
398 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) | |
399 | goto drop; | |
400 | ||
6aa20a22 | 401 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 LT |
402 | goto out; |
403 | ||
797659fb | 404 | ph = pppoe_hdr(skb); |
1da177e4 | 405 | |
90719dbe | 406 | po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
6aa20a22 | 407 | if (po != NULL) |
58a5a7b9 | 408 | return sk_receive_skb(sk_pppox(po), skb, 0); |
1da177e4 LT |
409 | drop: |
410 | kfree_skb(skb); | |
411 | out: | |
412 | return NET_RX_DROP; | |
413 | } | |
414 | ||
415 | /************************************************************************ | |
416 | * | |
417 | * Receive a PPPoE Discovery frame. | |
418 | * This is solely for detection of PADT frames | |
419 | * | |
420 | ***********************************************************************/ | |
421 | static int pppoe_disc_rcv(struct sk_buff *skb, | |
422 | struct net_device *dev, | |
f2ccd8fa DM |
423 | struct packet_type *pt, |
424 | struct net_device *orig_dev) | |
1da177e4 LT |
425 | |
426 | { | |
427 | struct pppoe_hdr *ph; | |
428 | struct pppox_sock *po; | |
429 | ||
430 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) | |
431 | goto abort; | |
432 | ||
6aa20a22 | 433 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 LT |
434 | goto out; |
435 | ||
797659fb | 436 | ph = pppoe_hdr(skb); |
1da177e4 LT |
437 | if (ph->code != PADT_CODE) |
438 | goto abort; | |
439 | ||
90719dbe | 440 | po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
1da177e4 LT |
441 | if (po) { |
442 | struct sock *sk = sk_pppox(po); | |
443 | ||
444 | bh_lock_sock(sk); | |
445 | ||
446 | /* If the user has locked the socket, just ignore | |
447 | * the packet. With the way two rcv protocols hook into | |
448 | * one socket family type, we cannot (easily) distinguish | |
449 | * what kind of SKB it is during backlog rcv. | |
450 | */ | |
451 | if (sock_owned_by_user(sk) == 0) { | |
452 | /* We're no longer connect at the PPPOE layer, | |
453 | * and must wait for ppp channel to disconnect us. | |
454 | */ | |
455 | sk->sk_state = PPPOX_ZOMBIE; | |
456 | } | |
457 | ||
458 | bh_unlock_sock(sk); | |
459 | sock_put(sk); | |
460 | } | |
461 | ||
462 | abort: | |
463 | kfree_skb(skb); | |
464 | out: | |
465 | return NET_RX_SUCCESS; /* Lies... :-) */ | |
466 | } | |
467 | ||
468 | static struct packet_type pppoes_ptype = { | |
469 | .type = __constant_htons(ETH_P_PPP_SES), | |
470 | .func = pppoe_rcv, | |
471 | }; | |
472 | ||
473 | static struct packet_type pppoed_ptype = { | |
474 | .type = __constant_htons(ETH_P_PPP_DISC), | |
475 | .func = pppoe_disc_rcv, | |
476 | }; | |
477 | ||
478 | static struct proto pppoe_sk_proto = { | |
479 | .name = "PPPOE", | |
480 | .owner = THIS_MODULE, | |
481 | .obj_size = sizeof(struct pppox_sock), | |
482 | }; | |
483 | ||
484 | /*********************************************************************** | |
485 | * | |
486 | * Initialize a new struct sock. | |
487 | * | |
488 | **********************************************************************/ | |
489 | static int pppoe_create(struct socket *sock) | |
490 | { | |
491 | int error = -ENOMEM; | |
492 | struct sock *sk; | |
493 | ||
494 | sk = sk_alloc(PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto, 1); | |
495 | if (!sk) | |
496 | goto out; | |
497 | ||
498 | sock_init_data(sock, sk); | |
499 | ||
500 | sock->state = SS_UNCONNECTED; | |
501 | sock->ops = &pppoe_ops; | |
502 | ||
503 | sk->sk_backlog_rcv = pppoe_rcv_core; | |
504 | sk->sk_state = PPPOX_NONE; | |
505 | sk->sk_type = SOCK_STREAM; | |
506 | sk->sk_family = PF_PPPOX; | |
507 | sk->sk_protocol = PX_PROTO_OE; | |
508 | ||
509 | error = 0; | |
510 | out: return error; | |
511 | } | |
512 | ||
513 | static int pppoe_release(struct socket *sock) | |
514 | { | |
515 | struct sock *sk = sock->sk; | |
516 | struct pppox_sock *po; | |
517 | int error = 0; | |
518 | ||
519 | if (!sk) | |
520 | return 0; | |
521 | ||
522 | if (sock_flag(sk, SOCK_DEAD)) | |
523 | return -EBADF; | |
524 | ||
525 | pppox_unbind_sock(sk); | |
526 | ||
527 | /* Signal the death of the socket. */ | |
528 | sk->sk_state = PPPOX_DEAD; | |
529 | ||
530 | po = pppox_sk(sk); | |
531 | if (po->pppoe_pa.sid) { | |
6f30e186 | 532 | delete_item(po->pppoe_pa.sid, po->pppoe_pa.remote, po->pppoe_ifindex); |
1da177e4 LT |
533 | } |
534 | ||
535 | if (po->pppoe_dev) | |
536 | dev_put(po->pppoe_dev); | |
537 | ||
538 | po->pppoe_dev = NULL; | |
539 | ||
540 | sock_orphan(sk); | |
541 | sock->sk = NULL; | |
542 | ||
543 | skb_queue_purge(&sk->sk_receive_queue); | |
544 | sock_put(sk); | |
545 | ||
546 | return error; | |
547 | } | |
548 | ||
549 | ||
550 | static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, | |
551 | int sockaddr_len, int flags) | |
552 | { | |
553 | struct sock *sk = sock->sk; | |
90719dbe | 554 | struct net_device *dev; |
1da177e4 LT |
555 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr; |
556 | struct pppox_sock *po = pppox_sk(sk); | |
557 | int error; | |
558 | ||
559 | lock_sock(sk); | |
560 | ||
561 | error = -EINVAL; | |
562 | if (sp->sa_protocol != PX_PROTO_OE) | |
563 | goto end; | |
564 | ||
565 | /* Check for already bound sockets */ | |
566 | error = -EBUSY; | |
567 | if ((sk->sk_state & PPPOX_CONNECTED) && sp->sa_addr.pppoe.sid) | |
568 | goto end; | |
569 | ||
570 | /* Check for already disconnected sockets, on attempts to disconnect */ | |
571 | error = -EALREADY; | |
572 | if ((sk->sk_state & PPPOX_DEAD) && !sp->sa_addr.pppoe.sid ) | |
573 | goto end; | |
574 | ||
575 | error = 0; | |
576 | if (po->pppoe_pa.sid) { | |
577 | pppox_unbind_sock(sk); | |
578 | ||
579 | /* Delete the old binding */ | |
6f30e186 | 580 | delete_item(po->pppoe_pa.sid,po->pppoe_pa.remote,po->pppoe_ifindex); |
1da177e4 LT |
581 | |
582 | if(po->pppoe_dev) | |
583 | dev_put(po->pppoe_dev); | |
584 | ||
585 | memset(sk_pppox(po) + 1, 0, | |
586 | sizeof(struct pppox_sock) - sizeof(struct sock)); | |
587 | ||
588 | sk->sk_state = PPPOX_NONE; | |
589 | } | |
590 | ||
591 | /* Don't re-bind if sid==0 */ | |
592 | if (sp->sa_addr.pppoe.sid != 0) { | |
593 | dev = dev_get_by_name(sp->sa_addr.pppoe.dev); | |
594 | ||
595 | error = -ENODEV; | |
596 | if (!dev) | |
597 | goto end; | |
598 | ||
599 | po->pppoe_dev = dev; | |
6f30e186 | 600 | po->pppoe_ifindex = dev->ifindex; |
1da177e4 LT |
601 | |
602 | if (!(dev->flags & IFF_UP)) | |
603 | goto err_put; | |
604 | ||
605 | memcpy(&po->pppoe_pa, | |
606 | &sp->sa_addr.pppoe, | |
607 | sizeof(struct pppoe_addr)); | |
608 | ||
609 | error = set_item(po); | |
610 | if (error < 0) | |
611 | goto err_put; | |
612 | ||
613 | po->chan.hdrlen = (sizeof(struct pppoe_hdr) + | |
614 | dev->hard_header_len); | |
615 | ||
c9aa6895 | 616 | po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr); |
1da177e4 LT |
617 | po->chan.private = sk; |
618 | po->chan.ops = &pppoe_chan_ops; | |
619 | ||
620 | error = ppp_register_channel(&po->chan); | |
621 | if (error) | |
622 | goto err_put; | |
623 | ||
624 | sk->sk_state = PPPOX_CONNECTED; | |
625 | } | |
626 | ||
627 | po->num = sp->sa_addr.pppoe.sid; | |
628 | ||
629 | end: | |
630 | release_sock(sk); | |
631 | return error; | |
632 | err_put: | |
633 | if (po->pppoe_dev) { | |
634 | dev_put(po->pppoe_dev); | |
635 | po->pppoe_dev = NULL; | |
636 | } | |
637 | goto end; | |
638 | } | |
639 | ||
640 | ||
641 | static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, | |
642 | int *usockaddr_len, int peer) | |
643 | { | |
644 | int len = sizeof(struct sockaddr_pppox); | |
645 | struct sockaddr_pppox sp; | |
646 | ||
647 | sp.sa_family = AF_PPPOX; | |
648 | sp.sa_protocol = PX_PROTO_OE; | |
649 | memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa, | |
650 | sizeof(struct pppoe_addr)); | |
651 | ||
652 | memcpy(uaddr, &sp, len); | |
653 | ||
654 | *usockaddr_len = len; | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
659 | ||
660 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, | |
661 | unsigned long arg) | |
662 | { | |
663 | struct sock *sk = sock->sk; | |
664 | struct pppox_sock *po = pppox_sk(sk); | |
665 | int val = 0; | |
666 | int err = 0; | |
667 | ||
668 | switch (cmd) { | |
669 | case PPPIOCGMRU: | |
670 | err = -ENXIO; | |
671 | ||
672 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
673 | break; | |
674 | ||
675 | err = -EFAULT; | |
676 | if (put_user(po->pppoe_dev->mtu - | |
677 | sizeof(struct pppoe_hdr) - | |
678 | PPP_HDRLEN, | |
679 | (int __user *) arg)) | |
680 | break; | |
681 | err = 0; | |
682 | break; | |
683 | ||
684 | case PPPIOCSMRU: | |
685 | err = -ENXIO; | |
686 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
687 | break; | |
688 | ||
689 | err = -EFAULT; | |
690 | if (get_user(val,(int __user *) arg)) | |
691 | break; | |
692 | ||
693 | if (val < (po->pppoe_dev->mtu | |
694 | - sizeof(struct pppoe_hdr) | |
695 | - PPP_HDRLEN)) | |
696 | err = 0; | |
697 | else | |
698 | err = -EINVAL; | |
699 | break; | |
700 | ||
701 | case PPPIOCSFLAGS: | |
702 | err = -EFAULT; | |
703 | if (get_user(val, (int __user *) arg)) | |
704 | break; | |
705 | err = 0; | |
706 | break; | |
707 | ||
708 | case PPPOEIOCSFWD: | |
709 | { | |
710 | struct pppox_sock *relay_po; | |
711 | ||
712 | err = -EBUSY; | |
713 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD)) | |
714 | break; | |
715 | ||
716 | err = -ENOTCONN; | |
717 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
718 | break; | |
719 | ||
720 | /* PPPoE address from the user specifies an outbound | |
90719dbe | 721 | PPPoE address which frames are forwarded to */ |
1da177e4 LT |
722 | err = -EFAULT; |
723 | if (copy_from_user(&po->pppoe_relay, | |
724 | (void __user *)arg, | |
725 | sizeof(struct sockaddr_pppox))) | |
726 | break; | |
727 | ||
728 | err = -EINVAL; | |
729 | if (po->pppoe_relay.sa_family != AF_PPPOX || | |
730 | po->pppoe_relay.sa_protocol!= PX_PROTO_OE) | |
731 | break; | |
732 | ||
733 | /* Check that the socket referenced by the address | |
734 | actually exists. */ | |
735 | relay_po = get_item_by_addr(&po->pppoe_relay); | |
736 | ||
737 | if (!relay_po) | |
738 | break; | |
739 | ||
740 | sock_put(sk_pppox(relay_po)); | |
741 | sk->sk_state |= PPPOX_RELAY; | |
742 | err = 0; | |
743 | break; | |
744 | } | |
745 | ||
746 | case PPPOEIOCDFWD: | |
747 | err = -EALREADY; | |
748 | if (!(sk->sk_state & PPPOX_RELAY)) | |
749 | break; | |
750 | ||
751 | sk->sk_state &= ~PPPOX_RELAY; | |
752 | err = 0; | |
753 | break; | |
754 | ||
755 | default:; | |
756 | }; | |
757 | ||
758 | return err; | |
759 | } | |
760 | ||
761 | ||
6aa20a22 | 762 | static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
763 | struct msghdr *m, size_t total_len) |
764 | { | |
765 | struct sk_buff *skb = NULL; | |
766 | struct sock *sk = sock->sk; | |
767 | struct pppox_sock *po = pppox_sk(sk); | |
768 | int error = 0; | |
769 | struct pppoe_hdr hdr; | |
770 | struct pppoe_hdr *ph; | |
771 | struct net_device *dev; | |
772 | char *start; | |
773 | ||
774 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { | |
775 | error = -ENOTCONN; | |
776 | goto end; | |
777 | } | |
778 | ||
779 | hdr.ver = 1; | |
780 | hdr.type = 1; | |
781 | hdr.code = 0; | |
782 | hdr.sid = po->num; | |
783 | ||
784 | lock_sock(sk); | |
785 | ||
786 | dev = po->pppoe_dev; | |
787 | ||
788 | error = -EMSGSIZE; | |
789 | if (total_len > (dev->mtu + dev->hard_header_len)) | |
790 | goto end; | |
791 | ||
792 | ||
793 | skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32, | |
794 | 0, GFP_KERNEL); | |
795 | if (!skb) { | |
796 | error = -ENOMEM; | |
797 | goto end; | |
798 | } | |
799 | ||
800 | /* Reserve space for headers. */ | |
801 | skb_reserve(skb, dev->hard_header_len); | |
802 | skb->nh.raw = skb->data; | |
803 | ||
804 | skb->dev = dev; | |
805 | ||
806 | skb->priority = sk->sk_priority; | |
807 | skb->protocol = __constant_htons(ETH_P_PPP_SES); | |
808 | ||
809 | ph = (struct pppoe_hdr *) skb_put(skb, total_len + sizeof(struct pppoe_hdr)); | |
810 | start = (char *) &ph->tag[0]; | |
811 | ||
812 | error = memcpy_fromiovec(start, m->msg_iov, total_len); | |
813 | ||
814 | if (error < 0) { | |
815 | kfree_skb(skb); | |
816 | goto end; | |
817 | } | |
818 | ||
819 | error = total_len; | |
820 | dev->hard_header(skb, dev, ETH_P_PPP_SES, | |
821 | po->pppoe_pa.remote, NULL, total_len); | |
822 | ||
823 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); | |
824 | ||
825 | ph->length = htons(total_len); | |
826 | ||
827 | dev_queue_xmit(skb); | |
828 | ||
829 | end: | |
830 | release_sock(sk); | |
831 | return error; | |
832 | } | |
833 | ||
834 | ||
835 | /************************************************************************ | |
836 | * | |
837 | * xmit function for internal use. | |
838 | * | |
839 | ***********************************************************************/ | |
840 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) | |
841 | { | |
842 | struct pppox_sock *po = pppox_sk(sk); | |
843 | struct net_device *dev = po->pppoe_dev; | |
844 | struct pppoe_hdr hdr; | |
845 | struct pppoe_hdr *ph; | |
846 | int headroom = skb_headroom(skb); | |
847 | int data_len = skb->len; | |
848 | struct sk_buff *skb2; | |
849 | ||
850 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
851 | goto abort; | |
852 | ||
853 | hdr.ver = 1; | |
854 | hdr.type = 1; | |
855 | hdr.code = 0; | |
856 | hdr.sid = po->num; | |
857 | hdr.length = htons(skb->len); | |
858 | ||
859 | if (!dev) | |
860 | goto abort; | |
861 | ||
862 | /* Copy the skb if there is no space for the header. */ | |
863 | if (headroom < (sizeof(struct pppoe_hdr) + dev->hard_header_len)) { | |
864 | skb2 = dev_alloc_skb(32+skb->len + | |
865 | sizeof(struct pppoe_hdr) + | |
866 | dev->hard_header_len); | |
867 | ||
868 | if (skb2 == NULL) | |
869 | goto abort; | |
870 | ||
871 | skb_reserve(skb2, dev->hard_header_len + sizeof(struct pppoe_hdr)); | |
872 | memcpy(skb_put(skb2, skb->len), skb->data, skb->len); | |
873 | } else { | |
874 | /* Make a clone so as to not disturb the original skb, | |
875 | * give dev_queue_xmit something it can free. | |
876 | */ | |
877 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
9bc18091 FM |
878 | |
879 | if (skb2 == NULL) | |
880 | goto abort; | |
1da177e4 LT |
881 | } |
882 | ||
883 | ph = (struct pppoe_hdr *) skb_push(skb2, sizeof(struct pppoe_hdr)); | |
884 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); | |
885 | skb2->protocol = __constant_htons(ETH_P_PPP_SES); | |
886 | ||
887 | skb2->nh.raw = skb2->data; | |
888 | ||
889 | skb2->dev = dev; | |
890 | ||
891 | dev->hard_header(skb2, dev, ETH_P_PPP_SES, | |
892 | po->pppoe_pa.remote, NULL, data_len); | |
893 | ||
894 | /* We're transmitting skb2, and assuming that dev_queue_xmit | |
895 | * will free it. The generic ppp layer however, is expecting | |
896 | * that we give back 'skb' (not 'skb2') in case of failure, | |
897 | * but free it in case of success. | |
898 | */ | |
899 | ||
900 | if (dev_queue_xmit(skb2) < 0) | |
901 | goto abort; | |
902 | ||
903 | kfree_skb(skb); | |
904 | return 1; | |
905 | ||
906 | abort: | |
907 | return 0; | |
908 | } | |
909 | ||
910 | ||
911 | /************************************************************************ | |
912 | * | |
913 | * xmit function called by generic PPP driver | |
914 | * sends PPP frame over PPPoE socket | |
915 | * | |
916 | ***********************************************************************/ | |
917 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
918 | { | |
919 | struct sock *sk = (struct sock *) chan->private; | |
920 | return __pppoe_xmit(sk, skb); | |
921 | } | |
922 | ||
923 | ||
6aa20a22 JG |
924 | static struct ppp_channel_ops pppoe_chan_ops = { |
925 | .start_xmit = pppoe_xmit, | |
1da177e4 LT |
926 | }; |
927 | ||
928 | static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock, | |
929 | struct msghdr *m, size_t total_len, int flags) | |
930 | { | |
931 | struct sock *sk = sock->sk; | |
932 | struct sk_buff *skb = NULL; | |
933 | int error = 0; | |
1da177e4 LT |
934 | |
935 | if (sk->sk_state & PPPOX_BOUND) { | |
936 | error = -EIO; | |
937 | goto end; | |
938 | } | |
939 | ||
940 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
941 | flags & MSG_DONTWAIT, &error); | |
942 | ||
943 | if (error < 0) { | |
944 | goto end; | |
945 | } | |
946 | ||
947 | m->msg_namelen = 0; | |
948 | ||
949 | if (skb) { | |
797659fb ACM |
950 | struct pppoe_hdr *ph = pppoe_hdr(skb); |
951 | const int len = ntohs(ph->length); | |
1da177e4 LT |
952 | |
953 | error = memcpy_toiovec(m->msg_iov, (unsigned char *) &ph->tag[0], len); | |
797659fb ACM |
954 | if (error == 0) |
955 | error = len; | |
1da177e4 LT |
956 | } |
957 | ||
797659fb | 958 | kfree_skb(skb); |
1da177e4 LT |
959 | end: |
960 | return error; | |
961 | } | |
962 | ||
963 | #ifdef CONFIG_PROC_FS | |
964 | static int pppoe_seq_show(struct seq_file *seq, void *v) | |
965 | { | |
966 | struct pppox_sock *po; | |
967 | char *dev_name; | |
968 | ||
969 | if (v == SEQ_START_TOKEN) { | |
970 | seq_puts(seq, "Id Address Device\n"); | |
971 | goto out; | |
972 | } | |
973 | ||
974 | po = v; | |
975 | dev_name = po->pppoe_pa.dev; | |
976 | ||
977 | seq_printf(seq, "%08X %02X:%02X:%02X:%02X:%02X:%02X %8s\n", | |
978 | po->pppoe_pa.sid, | |
979 | po->pppoe_pa.remote[0], po->pppoe_pa.remote[1], | |
980 | po->pppoe_pa.remote[2], po->pppoe_pa.remote[3], | |
981 | po->pppoe_pa.remote[4], po->pppoe_pa.remote[5], dev_name); | |
982 | out: | |
983 | return 0; | |
984 | } | |
985 | ||
986 | static __inline__ struct pppox_sock *pppoe_get_idx(loff_t pos) | |
987 | { | |
988 | struct pppox_sock *po = NULL; | |
989 | int i = 0; | |
990 | ||
991 | for (; i < PPPOE_HASH_SIZE; i++) { | |
992 | po = item_hash_table[i]; | |
993 | while (po) { | |
994 | if (!pos--) | |
995 | goto out; | |
996 | po = po->next; | |
997 | } | |
998 | } | |
999 | out: | |
1000 | return po; | |
1001 | } | |
1002 | ||
1003 | static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos) | |
1004 | { | |
1005 | loff_t l = *pos; | |
1006 | ||
1007 | read_lock_bh(&pppoe_hash_lock); | |
1008 | return l ? pppoe_get_idx(--l) : SEQ_START_TOKEN; | |
1009 | } | |
1010 | ||
1011 | static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1012 | { | |
1013 | struct pppox_sock *po; | |
1014 | ||
1015 | ++*pos; | |
1016 | if (v == SEQ_START_TOKEN) { | |
1017 | po = pppoe_get_idx(0); | |
1018 | goto out; | |
1019 | } | |
1020 | po = v; | |
6aa20a22 | 1021 | if (po->next) |
1da177e4 LT |
1022 | po = po->next; |
1023 | else { | |
1024 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
1025 | ||
1026 | while (++hash < PPPOE_HASH_SIZE) { | |
1027 | po = item_hash_table[hash]; | |
1028 | if (po) | |
1029 | break; | |
1030 | } | |
1031 | } | |
1032 | out: | |
1033 | return po; | |
1034 | } | |
1035 | ||
1036 | static void pppoe_seq_stop(struct seq_file *seq, void *v) | |
1037 | { | |
1038 | read_unlock_bh(&pppoe_hash_lock); | |
1039 | } | |
1040 | ||
1041 | static struct seq_operations pppoe_seq_ops = { | |
1042 | .start = pppoe_seq_start, | |
1043 | .next = pppoe_seq_next, | |
1044 | .stop = pppoe_seq_stop, | |
1045 | .show = pppoe_seq_show, | |
1046 | }; | |
1047 | ||
1048 | static int pppoe_seq_open(struct inode *inode, struct file *file) | |
1049 | { | |
1050 | return seq_open(file, &pppoe_seq_ops); | |
1051 | } | |
1052 | ||
d54b1fdb | 1053 | static const struct file_operations pppoe_seq_fops = { |
1da177e4 LT |
1054 | .owner = THIS_MODULE, |
1055 | .open = pppoe_seq_open, | |
1056 | .read = seq_read, | |
1057 | .llseek = seq_lseek, | |
1058 | .release = seq_release, | |
1059 | }; | |
1060 | ||
1061 | static int __init pppoe_proc_init(void) | |
1062 | { | |
1063 | struct proc_dir_entry *p; | |
1064 | ||
66600221 | 1065 | p = create_proc_entry("net/pppoe", S_IRUGO, NULL); |
1da177e4 LT |
1066 | if (!p) |
1067 | return -ENOMEM; | |
1068 | ||
1069 | p->proc_fops = &pppoe_seq_fops; | |
1070 | return 0; | |
1071 | } | |
1072 | #else /* CONFIG_PROC_FS */ | |
1073 | static inline int pppoe_proc_init(void) { return 0; } | |
1074 | #endif /* CONFIG_PROC_FS */ | |
1075 | ||
17ba15fb | 1076 | static const struct proto_ops pppoe_ops = { |
1da177e4 LT |
1077 | .family = AF_PPPOX, |
1078 | .owner = THIS_MODULE, | |
1079 | .release = pppoe_release, | |
1080 | .bind = sock_no_bind, | |
1081 | .connect = pppoe_connect, | |
1082 | .socketpair = sock_no_socketpair, | |
1083 | .accept = sock_no_accept, | |
1084 | .getname = pppoe_getname, | |
1085 | .poll = datagram_poll, | |
1086 | .listen = sock_no_listen, | |
1087 | .shutdown = sock_no_shutdown, | |
1088 | .setsockopt = sock_no_setsockopt, | |
1089 | .getsockopt = sock_no_getsockopt, | |
1090 | .sendmsg = pppoe_sendmsg, | |
1091 | .recvmsg = pppoe_recvmsg, | |
17ba15fb DM |
1092 | .mmap = sock_no_mmap, |
1093 | .ioctl = pppox_ioctl, | |
1da177e4 LT |
1094 | }; |
1095 | ||
1096 | static struct pppox_proto pppoe_proto = { | |
1097 | .create = pppoe_create, | |
1098 | .ioctl = pppoe_ioctl, | |
1099 | .owner = THIS_MODULE, | |
1100 | }; | |
1101 | ||
1102 | ||
1103 | static int __init pppoe_init(void) | |
1104 | { | |
1105 | int err = proto_register(&pppoe_sk_proto, 0); | |
1106 | ||
1107 | if (err) | |
1108 | goto out; | |
1109 | ||
1110 | err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); | |
1111 | if (err) | |
1112 | goto out_unregister_pppoe_proto; | |
1113 | ||
1114 | err = pppoe_proc_init(); | |
1115 | if (err) | |
1116 | goto out_unregister_pppox_proto; | |
6aa20a22 | 1117 | |
1da177e4 LT |
1118 | dev_add_pack(&pppoes_ptype); |
1119 | dev_add_pack(&pppoed_ptype); | |
1120 | register_netdevice_notifier(&pppoe_notifier); | |
1121 | out: | |
1122 | return err; | |
1123 | out_unregister_pppox_proto: | |
1124 | unregister_pppox_proto(PX_PROTO_OE); | |
1125 | out_unregister_pppoe_proto: | |
1126 | proto_unregister(&pppoe_sk_proto); | |
1127 | goto out; | |
1128 | } | |
1129 | ||
1130 | static void __exit pppoe_exit(void) | |
1131 | { | |
1132 | unregister_pppox_proto(PX_PROTO_OE); | |
1133 | dev_remove_pack(&pppoes_ptype); | |
1134 | dev_remove_pack(&pppoed_ptype); | |
1135 | unregister_netdevice_notifier(&pppoe_notifier); | |
66600221 | 1136 | remove_proc_entry("net/pppoe", NULL); |
1da177e4 LT |
1137 | proto_unregister(&pppoe_sk_proto); |
1138 | } | |
1139 | ||
1140 | module_init(pppoe_init); | |
1141 | module_exit(pppoe_exit); | |
1142 | ||
1143 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); | |
1144 | MODULE_DESCRIPTION("PPP over Ethernet driver"); | |
1145 | MODULE_LICENSE("GPL"); | |
1146 | MODULE_ALIAS_NETPROTO(PF_PPPOX); |