blob: c22b30533a14cb89eeeda69a83317f80e8c383b3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/** -*- 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 *
Florian Zumbiehl90719db2007-03-02 13:16:56 -080010 * 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 ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 * 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
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020081#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070082#include <net/sock.h>
83
84#include <asm/uaccess.h>
85
86#define PPPOE_HASH_BITS 4
87#define PPPOE_HASH_SIZE (1<<PPPOE_HASH_BITS)
88
89static struct ppp_channel_ops pppoe_chan_ops;
90
91static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
92static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb);
93static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb);
94
David S. Miller17ba15f2005-12-27 20:57:40 -080095static const struct proto_ops pppoe_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096static DEFINE_RWLOCK(pppoe_hash_lock);
97
98static struct ppp_channel_ops pppoe_chan_ops;
99
100static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b)
101{
102 return (a->sid == b->sid &&
103 (memcmp(a->remote, b->remote, ETH_ALEN) == 0));
104}
105
Al Virob963dc12007-08-23 02:55:33 -0400106static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107{
108 return (a->sid == sid &&
109 (memcmp(a->remote,addr,ETH_ALEN) == 0));
110}
111
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700112#if 8%PPPOE_HASH_BITS
113#error 8 must be a multiple of PPPOE_HASH_BITS
114#endif
115
Al Virob963dc12007-08-23 02:55:33 -0400116static int hash_item(__be16 sid, unsigned char *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117{
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700118 unsigned char hash = 0;
119 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700121 for (i = 0 ; i < ETH_ALEN ; i++) {
122 hash ^= addr[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 }
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700124 for (i = 0 ; i < sizeof(sid_t)*8 ; i += 8 ){
Al Virob963dc12007-08-23 02:55:33 -0400125 hash ^= (__force __u32)sid>>i;
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700126 }
127 for (i = 8 ; (i>>=1) >= PPPOE_HASH_BITS ; ) {
128 hash ^= hash>>i;
129 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131 return hash & ( PPPOE_HASH_SIZE - 1 );
132}
133
134/* zeroed because its in .bss */
135static struct pppox_sock *item_hash_table[PPPOE_HASH_SIZE];
136
137/**********************************************************************
138 *
139 * Set/get/delete/rehash items (internal versions)
140 *
141 **********************************************************************/
Al Virob963dc12007-08-23 02:55:33 -0400142static struct pppox_sock *__get_item(__be16 sid, unsigned char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
144 int hash = hash_item(sid, addr);
145 struct pppox_sock *ret;
146
147 ret = item_hash_table[hash];
148
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800149 while (ret && !(cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 ret = ret->next;
151
152 return ret;
153}
154
155static int __set_item(struct pppox_sock *po)
156{
157 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
158 struct pppox_sock *ret;
159
160 ret = item_hash_table[hash];
161 while (ret) {
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800162 if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && ret->pppoe_ifindex == po->pppoe_ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 return -EALREADY;
164
165 ret = ret->next;
166 }
167
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800168 po->next = item_hash_table[hash];
169 item_hash_table[hash] = po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171 return 0;
172}
173
Al Virob963dc12007-08-23 02:55:33 -0400174static struct pppox_sock *__delete_item(__be16 sid, char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
176 int hash = hash_item(sid, addr);
177 struct pppox_sock *ret, **src;
178
179 ret = item_hash_table[hash];
180 src = &item_hash_table[hash];
181
182 while (ret) {
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800183 if (cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 *src = ret->next;
185 break;
186 }
187
188 src = &ret->next;
189 ret = ret->next;
190 }
191
192 return ret;
193}
194
195/**********************************************************************
196 *
197 * Set/get/delete/rehash items
198 *
199 **********************************************************************/
Al Virob963dc12007-08-23 02:55:33 -0400200static inline struct pppox_sock *get_item(__be16 sid,
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800201 unsigned char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202{
203 struct pppox_sock *po;
204
205 read_lock_bh(&pppoe_hash_lock);
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800206 po = __get_item(sid, addr, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 if (po)
208 sock_hold(sk_pppox(po));
209 read_unlock_bh(&pppoe_hash_lock);
210
211 return po;
212}
213
214static inline struct pppox_sock *get_item_by_addr(struct sockaddr_pppox *sp)
215{
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700216 struct net_device *dev;
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800217 int ifindex;
218
Eric W. Biederman881d9662007-09-17 11:56:21 -0700219 dev = dev_get_by_name(&init_net, sp->sa_addr.pppoe.dev);
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800220 if(!dev)
221 return NULL;
222 ifindex = dev->ifindex;
223 dev_put(dev);
224 return get_item(sp->sa_addr.pppoe.sid, sp->sa_addr.pppoe.remote, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225}
226
Al Virob963dc12007-08-23 02:55:33 -0400227static inline struct pppox_sock *delete_item(__be16 sid, char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
229 struct pppox_sock *ret;
230
231 write_lock_bh(&pppoe_hash_lock);
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800232 ret = __delete_item(sid, addr, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 write_unlock_bh(&pppoe_hash_lock);
234
235 return ret;
236}
237
238
239
240/***************************************************************************
241 *
242 * Handler for device events.
243 * Certain device events require that sockets be unconnected.
244 *
245 **************************************************************************/
246
247static void pppoe_flush_dev(struct net_device *dev)
248{
249 int hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 BUG_ON(dev == NULL);
251
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700252 write_lock_bh(&pppoe_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 for (hash = 0; hash < PPPOE_HASH_SIZE; hash++) {
254 struct pppox_sock *po = item_hash_table[hash];
255
256 while (po != NULL) {
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700257 struct sock *sk = sk_pppox(po);
258 if (po->pppoe_dev != dev) {
259 po = po->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 continue;
261 }
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700262 po->pppoe_dev = NULL;
263 dev_put(dev);
264
265
266 /* We always grab the socket lock, followed by the
267 * pppoe_hash_lock, in that order. Since we should
268 * hold the sock lock while doing any unbinding,
269 * we need to release the lock we're holding.
270 * Hold a reference to the sock so it doesn't disappear
271 * as we're jumping between locks.
272 */
273
274 sock_hold(sk);
275
276 write_unlock_bh(&pppoe_hash_lock);
277 lock_sock(sk);
278
279 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
280 pppox_unbind_sock(sk);
281 sk->sk_state = PPPOX_ZOMBIE;
282 sk->sk_state_change(sk);
283 }
284
285 release_sock(sk);
286 sock_put(sk);
287
288 /* Restart scan at the beginning of this hash chain.
289 * While the lock was dropped the chain contents may
290 * have changed.
291 */
292 write_lock_bh(&pppoe_hash_lock);
293 po = item_hash_table[hash];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 }
295 }
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700296 write_unlock_bh(&pppoe_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297}
298
299static int pppoe_device_event(struct notifier_block *this,
300 unsigned long event, void *ptr)
301{
302 struct net_device *dev = (struct net_device *) ptr;
303
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900304 if (dev_net(dev) != &init_net)
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200305 return NOTIFY_DONE;
306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 /* Only look at sockets that are using this specific device. */
308 switch (event) {
309 case NETDEV_CHANGEMTU:
310 /* A change in mtu is a bad thing, requiring
311 * LCP re-negotiation.
312 */
313
314 case NETDEV_GOING_DOWN:
315 case NETDEV_DOWN:
316 /* Find every socket on this device and kill it. */
317 pppoe_flush_dev(dev);
318 break;
319
320 default:
321 break;
322 };
323
324 return NOTIFY_DONE;
325}
326
327
328static struct notifier_block pppoe_notifier = {
329 .notifier_call = pppoe_device_event,
330};
331
332
333/************************************************************************
334 *
335 * Do the real work of receiving a PPPoE Session frame.
336 *
337 ***********************************************************************/
338static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb)
339{
340 struct pppox_sock *po = pppox_sk(sk);
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700341 struct pppox_sock *relay_po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343 if (sk->sk_state & PPPOX_BOUND) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 ppp_input(&po->chan, skb);
345 } else if (sk->sk_state & PPPOX_RELAY) {
346 relay_po = get_item_by_addr(&po->pppoe_relay);
347
348 if (relay_po == NULL)
349 goto abort_kfree;
350
351 if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0)
352 goto abort_put;
353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 if (!__pppoe_xmit(sk_pppox(relay_po), skb))
355 goto abort_put;
356 } else {
357 if (sock_queue_rcv_skb(sk, skb))
358 goto abort_kfree;
359 }
360
361 return NET_RX_SUCCESS;
362
363abort_put:
364 sock_put(sk_pppox(relay_po));
365
366abort_kfree:
367 kfree_skb(skb);
368 return NET_RX_DROP;
369}
370
371/************************************************************************
372 *
373 * Receive wrapper called in BH context.
374 *
375 ***********************************************************************/
376static int pppoe_rcv(struct sk_buff *skb,
377 struct net_device *dev,
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700378 struct packet_type *pt,
379 struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
381{
382 struct pppoe_hdr *ph;
383 struct pppox_sock *po;
Herbert Xu392fdb02008-06-10 14:07:25 -0700384 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400386 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 goto out;
388
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900389 if (dev_net(dev) != &init_net)
Eric W. Biedermane730c152007-09-17 11:53:39 -0700390 goto drop;
391
Herbert Xu31bac442007-09-16 16:19:20 -0700392 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
393 goto drop;
394
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300395 ph = pppoe_hdr(skb);
Herbert Xu392fdb02008-06-10 14:07:25 -0700396 len = ntohs(ph->length);
397
398 skb_pull_rcsum(skb, sizeof(*ph));
399 if (skb->len < len)
400 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
David S. Miller263e69c2008-10-30 23:11:44 -0700402 if (pskb_trim_rcsum(skb, len))
Herbert Xu392fdb02008-06-10 14:07:25 -0700403 goto drop;
404
David S. Miller263e69c2008-10-30 23:11:44 -0700405 po = get_item(ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
406 if (!po)
Herbert Xu392fdb02008-06-10 14:07:25 -0700407 goto drop;
408
409 return sk_receive_skb(sk_pppox(po), skb, 0);
410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411drop:
412 kfree_skb(skb);
413out:
414 return NET_RX_DROP;
415}
416
417/************************************************************************
418 *
419 * Receive a PPPoE Discovery frame.
420 * This is solely for detection of PADT frames
421 *
422 ***********************************************************************/
423static int pppoe_disc_rcv(struct sk_buff *skb,
424 struct net_device *dev,
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700425 struct packet_type *pt,
426 struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
428{
429 struct pppoe_hdr *ph;
430 struct pppox_sock *po;
431
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900432 if (dev_net(dev) != &init_net)
Eric W. Biedermane730c152007-09-17 11:53:39 -0700433 goto abort;
434
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400435 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 goto out;
437
Herbert Xubc6cffd2008-06-10 14:08:25 -0700438 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
439 goto abort;
440
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300441 ph = pppoe_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 if (ph->code != PADT_CODE)
443 goto abort;
444
Al Virob963dc12007-08-23 02:55:33 -0400445 po = get_item(ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 if (po) {
447 struct sock *sk = sk_pppox(po);
448
449 bh_lock_sock(sk);
450
451 /* If the user has locked the socket, just ignore
452 * the packet. With the way two rcv protocols hook into
453 * one socket family type, we cannot (easily) distinguish
454 * what kind of SKB it is during backlog rcv.
455 */
456 if (sock_owned_by_user(sk) == 0) {
457 /* We're no longer connect at the PPPOE layer,
458 * and must wait for ppp channel to disconnect us.
459 */
460 sk->sk_state = PPPOX_ZOMBIE;
461 }
462
463 bh_unlock_sock(sk);
464 sock_put(sk);
465 }
466
467abort:
468 kfree_skb(skb);
469out:
470 return NET_RX_SUCCESS; /* Lies... :-) */
471}
472
473static struct packet_type pppoes_ptype = {
474 .type = __constant_htons(ETH_P_PPP_SES),
475 .func = pppoe_rcv,
476};
477
478static struct packet_type pppoed_ptype = {
479 .type = __constant_htons(ETH_P_PPP_DISC),
480 .func = pppoe_disc_rcv,
481};
482
483static struct proto pppoe_sk_proto = {
484 .name = "PPPOE",
485 .owner = THIS_MODULE,
486 .obj_size = sizeof(struct pppox_sock),
487};
488
489/***********************************************************************
490 *
491 * Initialize a new struct sock.
492 *
493 **********************************************************************/
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700494static int pppoe_create(struct net *net, struct socket *sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495{
496 int error = -ENOMEM;
497 struct sock *sk;
498
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700499 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 if (!sk)
501 goto out;
502
503 sock_init_data(sock, sk);
504
505 sock->state = SS_UNCONNECTED;
506 sock->ops = &pppoe_ops;
507
508 sk->sk_backlog_rcv = pppoe_rcv_core;
509 sk->sk_state = PPPOX_NONE;
510 sk->sk_type = SOCK_STREAM;
511 sk->sk_family = PF_PPPOX;
512 sk->sk_protocol = PX_PROTO_OE;
513
514 error = 0;
515out: return error;
516}
517
518static int pppoe_release(struct socket *sock)
519{
520 struct sock *sk = sock->sk;
521 struct pppox_sock *po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523 if (!sk)
524 return 0;
525
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700526 lock_sock(sk);
527 if (sock_flag(sk, SOCK_DEAD)){
528 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 return -EBADF;
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700530 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
532 pppox_unbind_sock(sk);
533
534 /* Signal the death of the socket. */
535 sk->sk_state = PPPOX_DEAD;
536
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700537
538 /* Write lock on hash lock protects the entire "po" struct from
539 * concurrent updates via pppoe_flush_dev. The "po" struct should
540 * be considered part of the hash table contents, thus protected
541 * by the hash table lock */
542 write_lock_bh(&pppoe_hash_lock);
543
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 po = pppox_sk(sk);
545 if (po->pppoe_pa.sid) {
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700546 __delete_item(po->pppoe_pa.sid,
547 po->pppoe_pa.remote, po->pppoe_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 }
549
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700550 if (po->pppoe_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 dev_put(po->pppoe_dev);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700552 po->pppoe_dev = NULL;
553 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700555 write_unlock_bh(&pppoe_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
557 sock_orphan(sk);
558 sock->sk = NULL;
559
560 skb_queue_purge(&sk->sk_receive_queue);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700561 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 sock_put(sk);
563
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700564 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565}
566
567
568static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
569 int sockaddr_len, int flags)
570{
571 struct sock *sk = sock->sk;
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800572 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
574 struct pppox_sock *po = pppox_sk(sk);
575 int error;
576
577 lock_sock(sk);
578
579 error = -EINVAL;
580 if (sp->sa_protocol != PX_PROTO_OE)
581 goto end;
582
583 /* Check for already bound sockets */
584 error = -EBUSY;
585 if ((sk->sk_state & PPPOX_CONNECTED) && sp->sa_addr.pppoe.sid)
586 goto end;
587
588 /* Check for already disconnected sockets, on attempts to disconnect */
589 error = -EALREADY;
590 if ((sk->sk_state & PPPOX_DEAD) && !sp->sa_addr.pppoe.sid )
591 goto end;
592
593 error = 0;
594 if (po->pppoe_pa.sid) {
595 pppox_unbind_sock(sk);
596
597 /* Delete the old binding */
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800598 delete_item(po->pppoe_pa.sid,po->pppoe_pa.remote,po->pppoe_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
600 if(po->pppoe_dev)
601 dev_put(po->pppoe_dev);
602
603 memset(sk_pppox(po) + 1, 0,
604 sizeof(struct pppox_sock) - sizeof(struct sock));
605
606 sk->sk_state = PPPOX_NONE;
607 }
608
609 /* Don't re-bind if sid==0 */
610 if (sp->sa_addr.pppoe.sid != 0) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700611 dev = dev_get_by_name(&init_net, sp->sa_addr.pppoe.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612
613 error = -ENODEV;
614 if (!dev)
615 goto end;
616
617 po->pppoe_dev = dev;
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800618 po->pppoe_ifindex = dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Florian Zumbiehl74b885c2007-04-20 16:57:27 -0700620 write_lock_bh(&pppoe_hash_lock);
621 if (!(dev->flags & IFF_UP)){
622 write_unlock_bh(&pppoe_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 goto err_put;
Florian Zumbiehl74b885c2007-04-20 16:57:27 -0700624 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
626 memcpy(&po->pppoe_pa,
627 &sp->sa_addr.pppoe,
628 sizeof(struct pppoe_addr));
629
Florian Zumbiehl74b885c2007-04-20 16:57:27 -0700630 error = __set_item(po);
631 write_unlock_bh(&pppoe_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 if (error < 0)
633 goto err_put;
634
635 po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
636 dev->hard_header_len);
637
Michal Ostrowskic9aa6892006-09-27 16:11:25 -0700638 po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 po->chan.private = sk;
640 po->chan.ops = &pppoe_chan_ops;
641
642 error = ppp_register_channel(&po->chan);
643 if (error)
644 goto err_put;
645
646 sk->sk_state = PPPOX_CONNECTED;
647 }
648
649 po->num = sp->sa_addr.pppoe.sid;
650
651 end:
652 release_sock(sk);
653 return error;
654err_put:
655 if (po->pppoe_dev) {
656 dev_put(po->pppoe_dev);
657 po->pppoe_dev = NULL;
658 }
659 goto end;
660}
661
662
663static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
664 int *usockaddr_len, int peer)
665{
666 int len = sizeof(struct sockaddr_pppox);
667 struct sockaddr_pppox sp;
668
669 sp.sa_family = AF_PPPOX;
670 sp.sa_protocol = PX_PROTO_OE;
671 memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa,
672 sizeof(struct pppoe_addr));
673
674 memcpy(uaddr, &sp, len);
675
676 *usockaddr_len = len;
677
678 return 0;
679}
680
681
682static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
683 unsigned long arg)
684{
685 struct sock *sk = sock->sk;
686 struct pppox_sock *po = pppox_sk(sk);
Florian Zumbiehl86c1dcf2007-07-30 17:48:23 -0700687 int val;
688 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
690 switch (cmd) {
691 case PPPIOCGMRU:
692 err = -ENXIO;
693
694 if (!(sk->sk_state & PPPOX_CONNECTED))
695 break;
696
697 err = -EFAULT;
698 if (put_user(po->pppoe_dev->mtu -
699 sizeof(struct pppoe_hdr) -
700 PPP_HDRLEN,
701 (int __user *) arg))
702 break;
703 err = 0;
704 break;
705
706 case PPPIOCSMRU:
707 err = -ENXIO;
708 if (!(sk->sk_state & PPPOX_CONNECTED))
709 break;
710
711 err = -EFAULT;
712 if (get_user(val,(int __user *) arg))
713 break;
714
715 if (val < (po->pppoe_dev->mtu
716 - sizeof(struct pppoe_hdr)
717 - PPP_HDRLEN))
718 err = 0;
719 else
720 err = -EINVAL;
721 break;
722
723 case PPPIOCSFLAGS:
724 err = -EFAULT;
725 if (get_user(val, (int __user *) arg))
726 break;
727 err = 0;
728 break;
729
730 case PPPOEIOCSFWD:
731 {
732 struct pppox_sock *relay_po;
733
734 err = -EBUSY;
735 if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD))
736 break;
737
738 err = -ENOTCONN;
739 if (!(sk->sk_state & PPPOX_CONNECTED))
740 break;
741
742 /* PPPoE address from the user specifies an outbound
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800743 PPPoE address which frames are forwarded to */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 err = -EFAULT;
745 if (copy_from_user(&po->pppoe_relay,
746 (void __user *)arg,
747 sizeof(struct sockaddr_pppox)))
748 break;
749
750 err = -EINVAL;
751 if (po->pppoe_relay.sa_family != AF_PPPOX ||
752 po->pppoe_relay.sa_protocol!= PX_PROTO_OE)
753 break;
754
755 /* Check that the socket referenced by the address
756 actually exists. */
757 relay_po = get_item_by_addr(&po->pppoe_relay);
758
759 if (!relay_po)
760 break;
761
762 sock_put(sk_pppox(relay_po));
763 sk->sk_state |= PPPOX_RELAY;
764 err = 0;
765 break;
766 }
767
768 case PPPOEIOCDFWD:
769 err = -EALREADY;
770 if (!(sk->sk_state & PPPOX_RELAY))
771 break;
772
773 sk->sk_state &= ~PPPOX_RELAY;
774 err = 0;
775 break;
776
Florian Zumbiehl86c1dcf2007-07-30 17:48:23 -0700777 default:
778 err = -ENOTTY;
779 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780
781 return err;
782}
783
784
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400785static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 struct msghdr *m, size_t total_len)
787{
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700788 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 struct sock *sk = sock->sk;
790 struct pppox_sock *po = pppox_sk(sk);
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700791 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 struct pppoe_hdr hdr;
793 struct pppoe_hdr *ph;
794 struct net_device *dev;
795 char *start;
796
Florian Zumbiehl8aeca8f2007-07-30 17:49:13 -0700797 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) {
799 error = -ENOTCONN;
800 goto end;
801 }
802
803 hdr.ver = 1;
804 hdr.type = 1;
805 hdr.code = 0;
806 hdr.sid = po->num;
807
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 dev = po->pppoe_dev;
809
810 error = -EMSGSIZE;
811 if (total_len > (dev->mtu + dev->hard_header_len))
812 goto end;
813
814
815 skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32,
816 0, GFP_KERNEL);
817 if (!skb) {
818 error = -ENOMEM;
819 goto end;
820 }
821
822 /* Reserve space for headers. */
823 skb_reserve(skb, dev->hard_header_len);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700824 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
826 skb->dev = dev;
827
828 skb->priority = sk->sk_priority;
829 skb->protocol = __constant_htons(ETH_P_PPP_SES);
830
831 ph = (struct pppoe_hdr *) skb_put(skb, total_len + sizeof(struct pppoe_hdr));
832 start = (char *) &ph->tag[0];
833
834 error = memcpy_fromiovec(start, m->msg_iov, total_len);
835
836 if (error < 0) {
837 kfree_skb(skb);
838 goto end;
839 }
840
841 error = total_len;
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700842 dev_hard_header(skb, dev, ETH_P_PPP_SES,
843 po->pppoe_pa.remote, NULL, total_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844
845 memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
846
847 ph->length = htons(total_len);
848
849 dev_queue_xmit(skb);
850
851end:
852 release_sock(sk);
853 return error;
854}
855
856
857/************************************************************************
858 *
859 * xmit function for internal use.
860 *
861 ***********************************************************************/
862static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
863{
864 struct pppox_sock *po = pppox_sk(sk);
865 struct net_device *dev = po->pppoe_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 struct pppoe_hdr *ph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 int data_len = skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
869 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
870 goto abort;
871
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 if (!dev)
873 goto abort;
874
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700875 /* Copy the data if there is no space for the header or if it's
876 * read-only.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 */
Herbert Xud9cc2042007-09-16 16:21:16 -0700878 if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 goto abort;
880
Herbert Xu9355ec22007-09-16 16:20:21 -0700881 __skb_push(skb, sizeof(*ph));
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700882 skb_reset_network_header(skb);
883
Herbert Xu9355ec22007-09-16 16:20:21 -0700884 ph = pppoe_hdr(skb);
885 ph->ver = 1;
886 ph->type = 1;
887 ph->code = 0;
888 ph->sid = po->num;
889 ph->length = htons(data_len);
890
891 skb->protocol = __constant_htons(ETH_P_PPP_SES);
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700892 skb->dev = dev;
893
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700894 dev_hard_header(skb, dev, ETH_P_PPP_SES,
895 po->pppoe_pa.remote, NULL, data_len);
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700896
Herbert Xu21d0c832007-09-19 10:45:02 -0700897 dev_queue_xmit(skb);
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700898
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 return 1;
900
901abort:
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700902 kfree_skb(skb);
903 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904}
905
906
907/************************************************************************
908 *
909 * xmit function called by generic PPP driver
910 * sends PPP frame over PPPoE socket
911 *
912 ***********************************************************************/
913static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
914{
915 struct sock *sk = (struct sock *) chan->private;
916 return __pppoe_xmit(sk, skb);
917}
918
919
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400920static struct ppp_channel_ops pppoe_chan_ops = {
921 .start_xmit = pppoe_xmit,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922};
923
924static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock,
925 struct msghdr *m, size_t total_len, int flags)
926{
927 struct sock *sk = sock->sk;
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700928 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
931 if (sk->sk_state & PPPOX_BOUND) {
932 error = -EIO;
933 goto end;
934 }
935
936 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
937 flags & MSG_DONTWAIT, &error);
938
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700939 if (error < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
942 m->msg_namelen = 0;
943
944 if (skb) {
Stephen Hemminger2645a3c2008-06-20 21:58:02 -0700945 total_len = min_t(size_t, total_len, skb->len);
Herbert Xu392fdb02008-06-10 14:07:25 -0700946 error = skb_copy_datagram_iovec(skb, 0, m->msg_iov, total_len);
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300947 if (error == 0)
Herbert Xu392fdb02008-06-10 14:07:25 -0700948 error = total_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 }
950
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300951 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952end:
953 return error;
954}
955
956#ifdef CONFIG_PROC_FS
957static int pppoe_seq_show(struct seq_file *seq, void *v)
958{
959 struct pppox_sock *po;
960 char *dev_name;
961
962 if (v == SEQ_START_TOKEN) {
963 seq_puts(seq, "Id Address Device\n");
964 goto out;
965 }
966
967 po = v;
968 dev_name = po->pppoe_pa.dev;
969
Johannes Berge1749612008-10-27 15:59:26 -0700970 seq_printf(seq, "%08X %pM %8s\n",
971 po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972out:
973 return 0;
974}
975
976static __inline__ struct pppox_sock *pppoe_get_idx(loff_t pos)
977{
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700978 struct pppox_sock *po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 int i = 0;
980
981 for (; i < PPPOE_HASH_SIZE; i++) {
982 po = item_hash_table[i];
983 while (po) {
984 if (!pos--)
985 goto out;
986 po = po->next;
987 }
988 }
989out:
990 return po;
991}
992
993static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
Stephen Hemminger3c582b32008-01-23 20:54:07 -0800994 __acquires(pppoe_hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995{
996 loff_t l = *pos;
997
998 read_lock_bh(&pppoe_hash_lock);
999 return l ? pppoe_get_idx(--l) : SEQ_START_TOKEN;
1000}
1001
1002static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1003{
1004 struct pppox_sock *po;
1005
1006 ++*pos;
1007 if (v == SEQ_START_TOKEN) {
1008 po = pppoe_get_idx(0);
1009 goto out;
1010 }
1011 po = v;
Jeff Garzik6aa20a22006-09-13 13:24:59 -04001012 if (po->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 po = po->next;
1014 else {
1015 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
1016
1017 while (++hash < PPPOE_HASH_SIZE) {
1018 po = item_hash_table[hash];
1019 if (po)
1020 break;
1021 }
1022 }
1023out:
1024 return po;
1025}
1026
1027static void pppoe_seq_stop(struct seq_file *seq, void *v)
Stephen Hemminger3c582b32008-01-23 20:54:07 -08001028 __releases(pppoe_hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029{
1030 read_unlock_bh(&pppoe_hash_lock);
1031}
1032
1033static struct seq_operations pppoe_seq_ops = {
1034 .start = pppoe_seq_start,
1035 .next = pppoe_seq_next,
1036 .stop = pppoe_seq_stop,
1037 .show = pppoe_seq_show,
1038};
1039
1040static int pppoe_seq_open(struct inode *inode, struct file *file)
1041{
1042 return seq_open(file, &pppoe_seq_ops);
1043}
1044
Arjan van de Vend54b1fd2007-02-12 00:55:34 -08001045static const struct file_operations pppoe_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 .owner = THIS_MODULE,
1047 .open = pppoe_seq_open,
1048 .read = seq_read,
1049 .llseek = seq_lseek,
1050 .release = seq_release,
1051};
1052
1053static int __init pppoe_proc_init(void)
1054{
1055 struct proc_dir_entry *p;
1056
Denis V. Luneva95609c2008-04-29 01:02:29 -07001057 p = proc_net_fops_create(&init_net, "pppoe", S_IRUGO, &pppoe_seq_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 if (!p)
1059 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 return 0;
1061}
1062#else /* CONFIG_PROC_FS */
1063static inline int pppoe_proc_init(void) { return 0; }
1064#endif /* CONFIG_PROC_FS */
1065
David S. Miller17ba15f2005-12-27 20:57:40 -08001066static const struct proto_ops pppoe_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 .family = AF_PPPOX,
1068 .owner = THIS_MODULE,
1069 .release = pppoe_release,
1070 .bind = sock_no_bind,
1071 .connect = pppoe_connect,
1072 .socketpair = sock_no_socketpair,
1073 .accept = sock_no_accept,
1074 .getname = pppoe_getname,
1075 .poll = datagram_poll,
1076 .listen = sock_no_listen,
1077 .shutdown = sock_no_shutdown,
1078 .setsockopt = sock_no_setsockopt,
1079 .getsockopt = sock_no_getsockopt,
1080 .sendmsg = pppoe_sendmsg,
1081 .recvmsg = pppoe_recvmsg,
David S. Miller17ba15f2005-12-27 20:57:40 -08001082 .mmap = sock_no_mmap,
1083 .ioctl = pppox_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084};
1085
1086static struct pppox_proto pppoe_proto = {
1087 .create = pppoe_create,
1088 .ioctl = pppoe_ioctl,
1089 .owner = THIS_MODULE,
1090};
1091
1092
1093static int __init pppoe_init(void)
1094{
1095 int err = proto_register(&pppoe_sk_proto, 0);
1096
1097 if (err)
1098 goto out;
1099
1100 err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
1101 if (err)
1102 goto out_unregister_pppoe_proto;
1103
1104 err = pppoe_proc_init();
1105 if (err)
1106 goto out_unregister_pppox_proto;
Jeff Garzik6aa20a22006-09-13 13:24:59 -04001107
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 dev_add_pack(&pppoes_ptype);
1109 dev_add_pack(&pppoed_ptype);
1110 register_netdevice_notifier(&pppoe_notifier);
1111out:
1112 return err;
1113out_unregister_pppox_proto:
1114 unregister_pppox_proto(PX_PROTO_OE);
1115out_unregister_pppoe_proto:
1116 proto_unregister(&pppoe_sk_proto);
1117 goto out;
1118}
1119
1120static void __exit pppoe_exit(void)
1121{
1122 unregister_pppox_proto(PX_PROTO_OE);
1123 dev_remove_pack(&pppoes_ptype);
1124 dev_remove_pack(&pppoed_ptype);
1125 unregister_netdevice_notifier(&pppoe_notifier);
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02001126 remove_proc_entry("pppoe", init_net.proc_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 proto_unregister(&pppoe_sk_proto);
1128}
1129
1130module_init(pppoe_init);
1131module_exit(pppoe_exit);
1132
1133MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
1134MODULE_DESCRIPTION("PPP over Ethernet driver");
1135MODULE_LICENSE("GPL");
1136MODULE_ALIAS_NETPROTO(PF_PPPOX);