blob: 58a26a47af29a1ee3764968dda5e7497752c9e7a [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) {
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300344 struct pppoe_hdr *ph = pppoe_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 int len = ntohs(ph->length);
Herbert Xucbb042f2006-03-20 22:43:56 -0800346 skb_pull_rcsum(skb, sizeof(struct pppoe_hdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 if (pskb_trim_rcsum(skb, len))
348 goto abort_kfree;
349
350 ppp_input(&po->chan, skb);
351 } else if (sk->sk_state & PPPOX_RELAY) {
352 relay_po = get_item_by_addr(&po->pppoe_relay);
353
354 if (relay_po == NULL)
355 goto abort_kfree;
356
357 if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0)
358 goto abort_put;
359
360 skb_pull(skb, sizeof(struct pppoe_hdr));
361 if (!__pppoe_xmit(sk_pppox(relay_po), skb))
362 goto abort_put;
363 } else {
364 if (sock_queue_rcv_skb(sk, skb))
365 goto abort_kfree;
366 }
367
368 return NET_RX_SUCCESS;
369
370abort_put:
371 sock_put(sk_pppox(relay_po));
372
373abort_kfree:
374 kfree_skb(skb);
375 return NET_RX_DROP;
376}
377
378/************************************************************************
379 *
380 * Receive wrapper called in BH context.
381 *
382 ***********************************************************************/
383static int pppoe_rcv(struct sk_buff *skb,
384 struct net_device *dev,
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700385 struct packet_type *pt,
386 struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
388{
389 struct pppoe_hdr *ph;
390 struct pppox_sock *po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400392 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 goto out;
394
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900395 if (dev_net(dev) != &init_net)
Eric W. Biedermane730c152007-09-17 11:53:39 -0700396 goto drop;
397
Herbert Xu31bac442007-09-16 16:19:20 -0700398 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
399 goto drop;
400
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300401 ph = pppoe_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Al Virob963dc12007-08-23 02:55:33 -0400403 po = get_item(ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400404 if (po != NULL)
Arnaldo Carvalho de Melo58a5a7b2006-11-16 14:06:06 -0200405 return sk_receive_skb(sk_pppox(po), skb, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406drop:
407 kfree_skb(skb);
408out:
409 return NET_RX_DROP;
410}
411
412/************************************************************************
413 *
414 * Receive a PPPoE Discovery frame.
415 * This is solely for detection of PADT frames
416 *
417 ***********************************************************************/
418static int pppoe_disc_rcv(struct sk_buff *skb,
419 struct net_device *dev,
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700420 struct packet_type *pt,
421 struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
423{
424 struct pppoe_hdr *ph;
425 struct pppox_sock *po;
426
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900427 if (dev_net(dev) != &init_net)
Eric W. Biedermane730c152007-09-17 11:53:39 -0700428 goto abort;
429
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
431 goto abort;
432
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400433 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 goto out;
435
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300436 ph = pppoe_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 if (ph->code != PADT_CODE)
438 goto abort;
439
Al Virob963dc12007-08-23 02:55:33 -0400440 po = get_item(ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 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
462abort:
463 kfree_skb(skb);
464out:
465 return NET_RX_SUCCESS; /* Lies... :-) */
466}
467
468static struct packet_type pppoes_ptype = {
469 .type = __constant_htons(ETH_P_PPP_SES),
470 .func = pppoe_rcv,
471};
472
473static struct packet_type pppoed_ptype = {
474 .type = __constant_htons(ETH_P_PPP_DISC),
475 .func = pppoe_disc_rcv,
476};
477
478static 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 **********************************************************************/
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700489static int pppoe_create(struct net *net, struct socket *sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490{
491 int error = -ENOMEM;
492 struct sock *sk;
493
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700494 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 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;
510out: return error;
511}
512
513static int pppoe_release(struct socket *sock)
514{
515 struct sock *sk = sock->sk;
516 struct pppox_sock *po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
518 if (!sk)
519 return 0;
520
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700521 lock_sock(sk);
522 if (sock_flag(sk, SOCK_DEAD)){
523 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 return -EBADF;
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700525 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
527 pppox_unbind_sock(sk);
528
529 /* Signal the death of the socket. */
530 sk->sk_state = PPPOX_DEAD;
531
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700532
533 /* Write lock on hash lock protects the entire "po" struct from
534 * concurrent updates via pppoe_flush_dev. The "po" struct should
535 * be considered part of the hash table contents, thus protected
536 * by the hash table lock */
537 write_lock_bh(&pppoe_hash_lock);
538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 po = pppox_sk(sk);
540 if (po->pppoe_pa.sid) {
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700541 __delete_item(po->pppoe_pa.sid,
542 po->pppoe_pa.remote, po->pppoe_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 }
544
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700545 if (po->pppoe_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 dev_put(po->pppoe_dev);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700547 po->pppoe_dev = NULL;
548 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700550 write_unlock_bh(&pppoe_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
552 sock_orphan(sk);
553 sock->sk = NULL;
554
555 skb_queue_purge(&sk->sk_receive_queue);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700556 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 sock_put(sk);
558
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700559 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560}
561
562
563static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
564 int sockaddr_len, int flags)
565{
566 struct sock *sk = sock->sk;
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800567 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
569 struct pppox_sock *po = pppox_sk(sk);
570 int error;
571
572 lock_sock(sk);
573
574 error = -EINVAL;
575 if (sp->sa_protocol != PX_PROTO_OE)
576 goto end;
577
578 /* Check for already bound sockets */
579 error = -EBUSY;
580 if ((sk->sk_state & PPPOX_CONNECTED) && sp->sa_addr.pppoe.sid)
581 goto end;
582
583 /* Check for already disconnected sockets, on attempts to disconnect */
584 error = -EALREADY;
585 if ((sk->sk_state & PPPOX_DEAD) && !sp->sa_addr.pppoe.sid )
586 goto end;
587
588 error = 0;
589 if (po->pppoe_pa.sid) {
590 pppox_unbind_sock(sk);
591
592 /* Delete the old binding */
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800593 delete_item(po->pppoe_pa.sid,po->pppoe_pa.remote,po->pppoe_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
595 if(po->pppoe_dev)
596 dev_put(po->pppoe_dev);
597
598 memset(sk_pppox(po) + 1, 0,
599 sizeof(struct pppox_sock) - sizeof(struct sock));
600
601 sk->sk_state = PPPOX_NONE;
602 }
603
604 /* Don't re-bind if sid==0 */
605 if (sp->sa_addr.pppoe.sid != 0) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700606 dev = dev_get_by_name(&init_net, sp->sa_addr.pppoe.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
608 error = -ENODEV;
609 if (!dev)
610 goto end;
611
612 po->pppoe_dev = dev;
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800613 po->pppoe_ifindex = dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
Florian Zumbiehl74b885c2007-04-20 16:57:27 -0700615 write_lock_bh(&pppoe_hash_lock);
616 if (!(dev->flags & IFF_UP)){
617 write_unlock_bh(&pppoe_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 goto err_put;
Florian Zumbiehl74b885c2007-04-20 16:57:27 -0700619 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
621 memcpy(&po->pppoe_pa,
622 &sp->sa_addr.pppoe,
623 sizeof(struct pppoe_addr));
624
Florian Zumbiehl74b885c2007-04-20 16:57:27 -0700625 error = __set_item(po);
626 write_unlock_bh(&pppoe_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 if (error < 0)
628 goto err_put;
629
630 po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
631 dev->hard_header_len);
632
Michal Ostrowskic9aa6892006-09-27 16:11:25 -0700633 po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 po->chan.private = sk;
635 po->chan.ops = &pppoe_chan_ops;
636
637 error = ppp_register_channel(&po->chan);
638 if (error)
639 goto err_put;
640
641 sk->sk_state = PPPOX_CONNECTED;
642 }
643
644 po->num = sp->sa_addr.pppoe.sid;
645
646 end:
647 release_sock(sk);
648 return error;
649err_put:
650 if (po->pppoe_dev) {
651 dev_put(po->pppoe_dev);
652 po->pppoe_dev = NULL;
653 }
654 goto end;
655}
656
657
658static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
659 int *usockaddr_len, int peer)
660{
661 int len = sizeof(struct sockaddr_pppox);
662 struct sockaddr_pppox sp;
663
664 sp.sa_family = AF_PPPOX;
665 sp.sa_protocol = PX_PROTO_OE;
666 memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa,
667 sizeof(struct pppoe_addr));
668
669 memcpy(uaddr, &sp, len);
670
671 *usockaddr_len = len;
672
673 return 0;
674}
675
676
677static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
678 unsigned long arg)
679{
680 struct sock *sk = sock->sk;
681 struct pppox_sock *po = pppox_sk(sk);
Florian Zumbiehl86c1dcf2007-07-30 17:48:23 -0700682 int val;
683 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
685 switch (cmd) {
686 case PPPIOCGMRU:
687 err = -ENXIO;
688
689 if (!(sk->sk_state & PPPOX_CONNECTED))
690 break;
691
692 err = -EFAULT;
693 if (put_user(po->pppoe_dev->mtu -
694 sizeof(struct pppoe_hdr) -
695 PPP_HDRLEN,
696 (int __user *) arg))
697 break;
698 err = 0;
699 break;
700
701 case PPPIOCSMRU:
702 err = -ENXIO;
703 if (!(sk->sk_state & PPPOX_CONNECTED))
704 break;
705
706 err = -EFAULT;
707 if (get_user(val,(int __user *) arg))
708 break;
709
710 if (val < (po->pppoe_dev->mtu
711 - sizeof(struct pppoe_hdr)
712 - PPP_HDRLEN))
713 err = 0;
714 else
715 err = -EINVAL;
716 break;
717
718 case PPPIOCSFLAGS:
719 err = -EFAULT;
720 if (get_user(val, (int __user *) arg))
721 break;
722 err = 0;
723 break;
724
725 case PPPOEIOCSFWD:
726 {
727 struct pppox_sock *relay_po;
728
729 err = -EBUSY;
730 if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD))
731 break;
732
733 err = -ENOTCONN;
734 if (!(sk->sk_state & PPPOX_CONNECTED))
735 break;
736
737 /* PPPoE address from the user specifies an outbound
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800738 PPPoE address which frames are forwarded to */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 err = -EFAULT;
740 if (copy_from_user(&po->pppoe_relay,
741 (void __user *)arg,
742 sizeof(struct sockaddr_pppox)))
743 break;
744
745 err = -EINVAL;
746 if (po->pppoe_relay.sa_family != AF_PPPOX ||
747 po->pppoe_relay.sa_protocol!= PX_PROTO_OE)
748 break;
749
750 /* Check that the socket referenced by the address
751 actually exists. */
752 relay_po = get_item_by_addr(&po->pppoe_relay);
753
754 if (!relay_po)
755 break;
756
757 sock_put(sk_pppox(relay_po));
758 sk->sk_state |= PPPOX_RELAY;
759 err = 0;
760 break;
761 }
762
763 case PPPOEIOCDFWD:
764 err = -EALREADY;
765 if (!(sk->sk_state & PPPOX_RELAY))
766 break;
767
768 sk->sk_state &= ~PPPOX_RELAY;
769 err = 0;
770 break;
771
Florian Zumbiehl86c1dcf2007-07-30 17:48:23 -0700772 default:
773 err = -ENOTTY;
774 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
776 return err;
777}
778
779
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400780static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 struct msghdr *m, size_t total_len)
782{
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700783 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 struct sock *sk = sock->sk;
785 struct pppox_sock *po = pppox_sk(sk);
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700786 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 struct pppoe_hdr hdr;
788 struct pppoe_hdr *ph;
789 struct net_device *dev;
790 char *start;
791
Florian Zumbiehl8aeca8f2007-07-30 17:49:13 -0700792 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) {
794 error = -ENOTCONN;
795 goto end;
796 }
797
798 hdr.ver = 1;
799 hdr.type = 1;
800 hdr.code = 0;
801 hdr.sid = po->num;
802
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 dev = po->pppoe_dev;
804
805 error = -EMSGSIZE;
806 if (total_len > (dev->mtu + dev->hard_header_len))
807 goto end;
808
809
810 skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32,
811 0, GFP_KERNEL);
812 if (!skb) {
813 error = -ENOMEM;
814 goto end;
815 }
816
817 /* Reserve space for headers. */
818 skb_reserve(skb, dev->hard_header_len);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700819 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
821 skb->dev = dev;
822
823 skb->priority = sk->sk_priority;
824 skb->protocol = __constant_htons(ETH_P_PPP_SES);
825
826 ph = (struct pppoe_hdr *) skb_put(skb, total_len + sizeof(struct pppoe_hdr));
827 start = (char *) &ph->tag[0];
828
829 error = memcpy_fromiovec(start, m->msg_iov, total_len);
830
831 if (error < 0) {
832 kfree_skb(skb);
833 goto end;
834 }
835
836 error = total_len;
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700837 dev_hard_header(skb, dev, ETH_P_PPP_SES,
838 po->pppoe_pa.remote, NULL, total_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
840 memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
841
842 ph->length = htons(total_len);
843
844 dev_queue_xmit(skb);
845
846end:
847 release_sock(sk);
848 return error;
849}
850
851
852/************************************************************************
853 *
854 * xmit function for internal use.
855 *
856 ***********************************************************************/
857static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
858{
859 struct pppox_sock *po = pppox_sk(sk);
860 struct net_device *dev = po->pppoe_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 struct pppoe_hdr *ph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 int data_len = skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
864 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
865 goto abort;
866
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 if (!dev)
868 goto abort;
869
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700870 /* Copy the data if there is no space for the header or if it's
871 * read-only.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 */
Herbert Xud9cc2042007-09-16 16:21:16 -0700873 if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 goto abort;
875
Herbert Xu9355ec22007-09-16 16:20:21 -0700876 __skb_push(skb, sizeof(*ph));
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700877 skb_reset_network_header(skb);
878
Herbert Xu9355ec22007-09-16 16:20:21 -0700879 ph = pppoe_hdr(skb);
880 ph->ver = 1;
881 ph->type = 1;
882 ph->code = 0;
883 ph->sid = po->num;
884 ph->length = htons(data_len);
885
886 skb->protocol = __constant_htons(ETH_P_PPP_SES);
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700887 skb->dev = dev;
888
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700889 dev_hard_header(skb, dev, ETH_P_PPP_SES,
890 po->pppoe_pa.remote, NULL, data_len);
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700891
Herbert Xu21d0c832007-09-19 10:45:02 -0700892 dev_queue_xmit(skb);
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700893
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 return 1;
895
896abort:
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700897 kfree_skb(skb);
898 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899}
900
901
902/************************************************************************
903 *
904 * xmit function called by generic PPP driver
905 * sends PPP frame over PPPoE socket
906 *
907 ***********************************************************************/
908static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
909{
910 struct sock *sk = (struct sock *) chan->private;
911 return __pppoe_xmit(sk, skb);
912}
913
914
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400915static struct ppp_channel_ops pppoe_chan_ops = {
916 .start_xmit = pppoe_xmit,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917};
918
919static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock,
920 struct msghdr *m, size_t total_len, int flags)
921{
922 struct sock *sk = sock->sk;
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700923 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925
926 if (sk->sk_state & PPPOX_BOUND) {
927 error = -EIO;
928 goto end;
929 }
930
931 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
932 flags & MSG_DONTWAIT, &error);
933
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700934 if (error < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936
937 m->msg_namelen = 0;
938
939 if (skb) {
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300940 struct pppoe_hdr *ph = pppoe_hdr(skb);
941 const int len = ntohs(ph->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
943 error = memcpy_toiovec(m->msg_iov, (unsigned char *) &ph->tag[0], len);
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300944 if (error == 0)
945 error = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 }
947
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300948 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949end:
950 return error;
951}
952
953#ifdef CONFIG_PROC_FS
954static int pppoe_seq_show(struct seq_file *seq, void *v)
955{
956 struct pppox_sock *po;
957 char *dev_name;
Joe Perches0795af52007-10-03 17:59:30 -0700958 DECLARE_MAC_BUF(mac);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
960 if (v == SEQ_START_TOKEN) {
961 seq_puts(seq, "Id Address Device\n");
962 goto out;
963 }
964
965 po = v;
966 dev_name = po->pppoe_pa.dev;
967
Joe Perches0795af52007-10-03 17:59:30 -0700968 seq_printf(seq, "%08X %s %8s\n",
969 po->pppoe_pa.sid, print_mac(mac, po->pppoe_pa.remote), dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970out:
971 return 0;
972}
973
974static __inline__ struct pppox_sock *pppoe_get_idx(loff_t pos)
975{
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700976 struct pppox_sock *po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 int i = 0;
978
979 for (; i < PPPOE_HASH_SIZE; i++) {
980 po = item_hash_table[i];
981 while (po) {
982 if (!pos--)
983 goto out;
984 po = po->next;
985 }
986 }
987out:
988 return po;
989}
990
991static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
Stephen Hemminger3c582b32008-01-23 20:54:07 -0800992 __acquires(pppoe_hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993{
994 loff_t l = *pos;
995
996 read_lock_bh(&pppoe_hash_lock);
997 return l ? pppoe_get_idx(--l) : SEQ_START_TOKEN;
998}
999
1000static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1001{
1002 struct pppox_sock *po;
1003
1004 ++*pos;
1005 if (v == SEQ_START_TOKEN) {
1006 po = pppoe_get_idx(0);
1007 goto out;
1008 }
1009 po = v;
Jeff Garzik6aa20a22006-09-13 13:24:59 -04001010 if (po->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 po = po->next;
1012 else {
1013 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
1014
1015 while (++hash < PPPOE_HASH_SIZE) {
1016 po = item_hash_table[hash];
1017 if (po)
1018 break;
1019 }
1020 }
1021out:
1022 return po;
1023}
1024
1025static void pppoe_seq_stop(struct seq_file *seq, void *v)
Stephen Hemminger3c582b32008-01-23 20:54:07 -08001026 __releases(pppoe_hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027{
1028 read_unlock_bh(&pppoe_hash_lock);
1029}
1030
1031static struct seq_operations pppoe_seq_ops = {
1032 .start = pppoe_seq_start,
1033 .next = pppoe_seq_next,
1034 .stop = pppoe_seq_stop,
1035 .show = pppoe_seq_show,
1036};
1037
1038static int pppoe_seq_open(struct inode *inode, struct file *file)
1039{
1040 return seq_open(file, &pppoe_seq_ops);
1041}
1042
Arjan van de Vend54b1fd2007-02-12 00:55:34 -08001043static const struct file_operations pppoe_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 .owner = THIS_MODULE,
1045 .open = pppoe_seq_open,
1046 .read = seq_read,
1047 .llseek = seq_lseek,
1048 .release = seq_release,
1049};
1050
1051static int __init pppoe_proc_init(void)
1052{
1053 struct proc_dir_entry *p;
1054
Denis V. Luneva95609c2008-04-29 01:02:29 -07001055 p = proc_net_fops_create(&init_net, "pppoe", S_IRUGO, &pppoe_seq_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 if (!p)
1057 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 return 0;
1059}
1060#else /* CONFIG_PROC_FS */
1061static inline int pppoe_proc_init(void) { return 0; }
1062#endif /* CONFIG_PROC_FS */
1063
David S. Miller17ba15f2005-12-27 20:57:40 -08001064static const struct proto_ops pppoe_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 .family = AF_PPPOX,
1066 .owner = THIS_MODULE,
1067 .release = pppoe_release,
1068 .bind = sock_no_bind,
1069 .connect = pppoe_connect,
1070 .socketpair = sock_no_socketpair,
1071 .accept = sock_no_accept,
1072 .getname = pppoe_getname,
1073 .poll = datagram_poll,
1074 .listen = sock_no_listen,
1075 .shutdown = sock_no_shutdown,
1076 .setsockopt = sock_no_setsockopt,
1077 .getsockopt = sock_no_getsockopt,
1078 .sendmsg = pppoe_sendmsg,
1079 .recvmsg = pppoe_recvmsg,
David S. Miller17ba15f2005-12-27 20:57:40 -08001080 .mmap = sock_no_mmap,
1081 .ioctl = pppox_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082};
1083
1084static struct pppox_proto pppoe_proto = {
1085 .create = pppoe_create,
1086 .ioctl = pppoe_ioctl,
1087 .owner = THIS_MODULE,
1088};
1089
1090
1091static int __init pppoe_init(void)
1092{
1093 int err = proto_register(&pppoe_sk_proto, 0);
1094
1095 if (err)
1096 goto out;
1097
1098 err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
1099 if (err)
1100 goto out_unregister_pppoe_proto;
1101
1102 err = pppoe_proc_init();
1103 if (err)
1104 goto out_unregister_pppox_proto;
Jeff Garzik6aa20a22006-09-13 13:24:59 -04001105
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 dev_add_pack(&pppoes_ptype);
1107 dev_add_pack(&pppoed_ptype);
1108 register_netdevice_notifier(&pppoe_notifier);
1109out:
1110 return err;
1111out_unregister_pppox_proto:
1112 unregister_pppox_proto(PX_PROTO_OE);
1113out_unregister_pppoe_proto:
1114 proto_unregister(&pppoe_sk_proto);
1115 goto out;
1116}
1117
1118static void __exit pppoe_exit(void)
1119{
1120 unregister_pppox_proto(PX_PROTO_OE);
1121 dev_remove_pack(&pppoes_ptype);
1122 dev_remove_pack(&pppoed_ptype);
1123 unregister_netdevice_notifier(&pppoe_notifier);
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02001124 remove_proc_entry("pppoe", init_net.proc_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 proto_unregister(&pppoe_sk_proto);
1126}
1127
1128module_init(pppoe_init);
1129module_exit(pppoe_exit);
1130
1131MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
1132MODULE_DESCRIPTION("PPP over Ethernet driver");
1133MODULE_LICENSE("GPL");
1134MODULE_ALIAS_NETPROTO(PF_PPPOX);