blob: e94790632d558b6b5b4221fcccf0905a4630ed75 [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
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
88static struct ppp_channel_ops pppoe_chan_ops;
89
90static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
91static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb);
92static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb);
93
David S. Miller17ba15f2005-12-27 20:57:40 -080094static const struct proto_ops pppoe_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095static DEFINE_RWLOCK(pppoe_hash_lock);
96
97static struct ppp_channel_ops pppoe_chan_ops;
98
99static 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
105static 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
111static 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 */
129static struct pppox_sock *item_hash_table[PPPOE_HASH_SIZE];
130
131/**********************************************************************
132 *
133 * Set/get/delete/rehash items (internal versions)
134 *
135 **********************************************************************/
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800136static struct pppox_sock *__get_item(unsigned long sid, unsigned char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137{
138 int hash = hash_item(sid, addr);
139 struct pppox_sock *ret;
140
141 ret = item_hash_table[hash];
142
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800143 while (ret && !(cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 ret = ret->next;
145
146 return ret;
147}
148
149static 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) {
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800156 if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && ret->pppoe_ifindex == po->pppoe_ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 return -EALREADY;
158
159 ret = ret->next;
160 }
161
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800162 po->next = item_hash_table[hash];
163 item_hash_table[hash] = po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165 return 0;
166}
167
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800168static struct pppox_sock *__delete_item(unsigned long sid, char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169{
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) {
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800177 if (cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 *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 **********************************************************************/
194static inline struct pppox_sock *get_item(unsigned long sid,
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800195 unsigned char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
197 struct pppox_sock *po;
198
199 read_lock_bh(&pppoe_hash_lock);
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800200 po = __get_item(sid, addr, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 if (po)
202 sock_hold(sk_pppox(po));
203 read_unlock_bh(&pppoe_hash_lock);
204
205 return po;
206}
207
208static inline struct pppox_sock *get_item_by_addr(struct sockaddr_pppox *sp)
209{
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800210 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
220
221static 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
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800235static inline struct pppox_sock *delete_item(unsigned long sid, char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236{
237 struct pppox_sock *ret;
238
239 write_lock_bh(&pppoe_hash_lock);
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800240 ret = __delete_item(sid, addr, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 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
255static 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
308static 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
334static 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 ***********************************************************************/
344static 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) {
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300350 struct pppoe_hdr *ph = pppoe_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 int len = ntohs(ph->length);
Herbert Xucbb042f2006-03-20 22:43:56 -0800352 skb_pull_rcsum(skb, sizeof(struct pppoe_hdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 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
376abort_put:
377 sock_put(sk_pppox(relay_po));
378
379abort_kfree:
380 kfree_skb(skb);
381 return NET_RX_DROP;
382}
383
384/************************************************************************
385 *
386 * Receive wrapper called in BH context.
387 *
388 ***********************************************************************/
389static int pppoe_rcv(struct sk_buff *skb,
390 struct net_device *dev,
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700391 struct packet_type *pt,
392 struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
394{
395 struct pppoe_hdr *ph;
396 struct pppox_sock *po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
398 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
399 goto drop;
400
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400401 if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 goto out;
403
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300404 ph = pppoe_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800406 po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400407 if (po != NULL)
Arnaldo Carvalho de Melo58a5a7b2006-11-16 14:06:06 -0200408 return sk_receive_skb(sk_pppox(po), skb, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409drop:
410 kfree_skb(skb);
411out:
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 ***********************************************************************/
421static int pppoe_disc_rcv(struct sk_buff *skb,
422 struct net_device *dev,
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700423 struct packet_type *pt,
424 struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
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
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
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800440 po = get_item((unsigned long) 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 **********************************************************************/
489static 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;
510out: return error;
511}
512
513static 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) {
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800532 delete_item(po->pppoe_pa.sid, po->pppoe_pa.remote, po->pppoe_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 }
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
550static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
551 int sockaddr_len, int flags)
552{
553 struct sock *sk = sock->sk;
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800554 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 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 */
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800580 delete_item(po->pppoe_pa.sid,po->pppoe_pa.remote,po->pppoe_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
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;
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800600 po->pppoe_ifindex = dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601
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
Michal Ostrowskic9aa6892006-09-27 16:11:25 -0700616 po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 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;
632err_put:
633 if (po->pppoe_dev) {
634 dev_put(po->pppoe_dev);
635 po->pppoe_dev = NULL;
636 }
637 goto end;
638}
639
640
641static 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
660static 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
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800721 PPPoE address which frames are forwarded to */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 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
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400762static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 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);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700802 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
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
829end:
830 release_sock(sk);
831 return error;
832}
833
834
835/************************************************************************
836 *
837 * xmit function for internal use.
838 *
839 ***********************************************************************/
840static 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);
Florin Malita9bc18092006-06-05 15:34:33 -0700878
879 if (skb2 == NULL)
880 goto abort;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 }
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
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700887 skb_reset_network_header(skb2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
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
906abort:
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 ***********************************************************************/
917static 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
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400924static struct ppp_channel_ops pppoe_chan_ops = {
925 .start_xmit = pppoe_xmit,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926};
927
928static 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
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) {
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300950 struct pppoe_hdr *ph = pppoe_hdr(skb);
951 const int len = ntohs(ph->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952
953 error = memcpy_toiovec(m->msg_iov, (unsigned char *) &ph->tag[0], len);
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300954 if (error == 0)
955 error = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 }
957
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300958 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959end:
960 return error;
961}
962
963#ifdef CONFIG_PROC_FS
964static 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);
982out:
983 return 0;
984}
985
986static __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 }
999out:
1000 return po;
1001}
1002
1003static 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
1011static 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;
Jeff Garzik6aa20a22006-09-13 13:24:59 -04001021 if (po->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 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 }
1032out:
1033 return po;
1034}
1035
1036static void pppoe_seq_stop(struct seq_file *seq, void *v)
1037{
1038 read_unlock_bh(&pppoe_hash_lock);
1039}
1040
1041static 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
1048static int pppoe_seq_open(struct inode *inode, struct file *file)
1049{
1050 return seq_open(file, &pppoe_seq_ops);
1051}
1052
Arjan van de Vend54b1fd2007-02-12 00:55:34 -08001053static const struct file_operations pppoe_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 .owner = THIS_MODULE,
1055 .open = pppoe_seq_open,
1056 .read = seq_read,
1057 .llseek = seq_lseek,
1058 .release = seq_release,
1059};
1060
1061static int __init pppoe_proc_init(void)
1062{
1063 struct proc_dir_entry *p;
1064
Al Viro66600222005-09-28 22:32:57 +01001065 p = create_proc_entry("net/pppoe", S_IRUGO, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 if (!p)
1067 return -ENOMEM;
1068
1069 p->proc_fops = &pppoe_seq_fops;
1070 return 0;
1071}
1072#else /* CONFIG_PROC_FS */
1073static inline int pppoe_proc_init(void) { return 0; }
1074#endif /* CONFIG_PROC_FS */
1075
David S. Miller17ba15f2005-12-27 20:57:40 -08001076static const struct proto_ops pppoe_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 .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,
David S. Miller17ba15f2005-12-27 20:57:40 -08001092 .mmap = sock_no_mmap,
1093 .ioctl = pppox_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094};
1095
1096static struct pppox_proto pppoe_proto = {
1097 .create = pppoe_create,
1098 .ioctl = pppoe_ioctl,
1099 .owner = THIS_MODULE,
1100};
1101
1102
1103static 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;
Jeff Garzik6aa20a22006-09-13 13:24:59 -04001117
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 dev_add_pack(&pppoes_ptype);
1119 dev_add_pack(&pppoed_ptype);
1120 register_netdevice_notifier(&pppoe_notifier);
1121out:
1122 return err;
1123out_unregister_pppox_proto:
1124 unregister_pppox_proto(PX_PROTO_OE);
1125out_unregister_pppoe_proto:
1126 proto_unregister(&pppoe_sk_proto);
1127 goto out;
1128}
1129
1130static 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);
Al Viro66600222005-09-28 22:32:57 +01001136 remove_proc_entry("net/pppoe", NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 proto_unregister(&pppoe_sk_proto);
1138}
1139
1140module_init(pppoe_init);
1141module_exit(pppoe_exit);
1142
1143MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
1144MODULE_DESCRIPTION("PPP over Ethernet driver");
1145MODULE_LICENSE("GPL");
1146MODULE_ALIAS_NETPROTO(PF_PPPOX);