blob: 2559991eea6a59e23a88837a897cf8e8dad7cc0a [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
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -080081#include <linux/nsproxy.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020082#include <net/net_namespace.h>
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -080083#include <net/netns/generic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070084#include <net/sock.h>
85
86#include <asm/uaccess.h>
87
88#define PPPOE_HASH_BITS 4
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -080089#define PPPOE_HASH_SIZE (1 << PPPOE_HASH_BITS)
90#define PPPOE_HASH_MASK (PPPOE_HASH_SIZE - 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
93static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb);
94static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb);
95
David S. Miller17ba15f2005-12-27 20:57:40 -080096static const struct proto_ops pppoe_ops;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -080097static struct ppp_channel_ops pppoe_chan_ops;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -080098
99/* per-net private data for this module */
Hannes Ederd6781f22009-02-14 11:13:52 +0000100static int pppoe_net_id;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800101struct pppoe_net {
102 /*
103 * we could use _single_ hash table for all
104 * nets by injecting net id into the hash but
105 * it would increase hash chains and add
106 * a few additional math comparations messy
107 * as well, moreover in case of SMP less locking
108 * controversy here
109 */
110 struct pppox_sock *hash_table[PPPOE_HASH_SIZE];
111 rwlock_t hash_lock;
112};
113
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800114/*
115 * PPPoE could be in the following stages:
116 * 1) Discovery stage (to obtain remote MAC and Session ID)
117 * 2) Session stage (MAC and SID are known)
118 *
119 * Ethernet frames have a special tag for this but
120 * we use simplier approach based on session id
121 */
122static inline bool stage_session(__be16 sid)
123{
124 return sid != 0;
125}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800127static inline struct pppoe_net *pppoe_pernet(struct net *net)
128{
129 BUG_ON(!net);
130
131 return net_generic(net, pppoe_net_id);
132}
133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b)
135{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800136 return a->sid == b->sid && !memcmp(a->remote, b->remote, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137}
138
Al Virob963dc12007-08-23 02:55:33 -0400139static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800141 return a->sid == sid && !memcmp(a->remote, addr, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142}
143
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800144#if 8 % PPPOE_HASH_BITS
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700145#error 8 must be a multiple of PPPOE_HASH_BITS
146#endif
147
Al Virob963dc12007-08-23 02:55:33 -0400148static int hash_item(__be16 sid, unsigned char *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700150 unsigned char hash = 0;
151 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800153 for (i = 0; i < ETH_ALEN; i++)
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700154 hash ^= addr[i];
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800155 for (i = 0; i < sizeof(sid_t) * 8; i += 8)
156 hash ^= (__force __u32)sid >> i;
157 for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;)
158 hash ^= hash >> i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800160 return hash & PPPOE_HASH_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161}
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163/**********************************************************************
164 *
165 * Set/get/delete/rehash items (internal versions)
166 *
167 **********************************************************************/
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800168static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid,
169 unsigned char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170{
171 int hash = hash_item(sid, addr);
172 struct pppox_sock *ret;
173
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800174 ret = pn->hash_table[hash];
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800175 while (ret) {
176 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
177 ret->pppoe_ifindex == ifindex)
178 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800180 ret = ret->next;
181 }
182
183 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184}
185
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800186static int __set_item(struct pppoe_net *pn, struct pppox_sock *po)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187{
188 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
189 struct pppox_sock *ret;
190
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800191 ret = pn->hash_table[hash];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 while (ret) {
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800193 if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) &&
194 ret->pppoe_ifindex == po->pppoe_ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 return -EALREADY;
196
197 ret = ret->next;
198 }
199
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800200 po->next = pn->hash_table[hash];
201 pn->hash_table[hash] = po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
203 return 0;
204}
205
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800206static struct pppox_sock *__delete_item(struct pppoe_net *pn, __be16 sid,
207 char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
209 int hash = hash_item(sid, addr);
210 struct pppox_sock *ret, **src;
211
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800212 ret = pn->hash_table[hash];
213 src = &pn->hash_table[hash];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
215 while (ret) {
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800216 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
217 ret->pppoe_ifindex == ifindex) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 *src = ret->next;
219 break;
220 }
221
222 src = &ret->next;
223 ret = ret->next;
224 }
225
226 return ret;
227}
228
229/**********************************************************************
230 *
231 * Set/get/delete/rehash items
232 *
233 **********************************************************************/
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800234static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid,
235 unsigned char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236{
237 struct pppox_sock *po;
238
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800239 read_lock_bh(&pn->hash_lock);
240 po = __get_item(pn, sid, addr, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 if (po)
242 sock_hold(sk_pppox(po));
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800243 read_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245 return po;
246}
247
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800248static inline struct pppox_sock *get_item_by_addr(struct net *net,
249 struct sockaddr_pppox *sp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250{
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700251 struct net_device *dev;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800252 struct pppoe_net *pn;
253 struct pppox_sock *pppox_sock;
254
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800255 int ifindex;
256
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800257 dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800258 if (!dev)
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800259 return NULL;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800260
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800261 ifindex = dev->ifindex;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800262 pn = net_generic(net, pppoe_net_id);
263 pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid,
264 sp->sa_addr.pppoe.remote, ifindex);
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800265 dev_put(dev);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800266
267 return pppox_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268}
269
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800270static inline struct pppox_sock *delete_item(struct pppoe_net *pn, __be16 sid,
271 char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272{
273 struct pppox_sock *ret;
274
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800275 write_lock_bh(&pn->hash_lock);
276 ret = __delete_item(pn, sid, addr, ifindex);
277 write_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279 return ret;
280}
281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282/***************************************************************************
283 *
284 * Handler for device events.
285 * Certain device events require that sockets be unconnected.
286 *
287 **************************************************************************/
288
289static void pppoe_flush_dev(struct net_device *dev)
290{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800291 struct pppoe_net *pn;
292 int i;
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 BUG_ON(dev == NULL);
295
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800296 pn = pppoe_pernet(dev_net(dev));
297 if (!pn) /* already freed */
298 return;
299
300 write_lock_bh(&pn->hash_lock);
301 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
302 struct pppox_sock *po = pn->hash_table[i];
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700303 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700305 while (po) {
306 while (po && po->pppoe_dev != dev) {
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700307 po = po->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 }
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700309
310 if (!po)
311 break;
312
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800313 sk = sk_pppox(po);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700314
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700315 /* We always grab the socket lock, followed by the
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700316 * hash_lock, in that order. Since we should hold the
317 * sock lock while doing any unbinding, we need to
318 * release the lock we're holding. Hold a reference to
319 * the sock so it doesn't disappear as we're jumping
320 * between locks.
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700321 */
322
323 sock_hold(sk);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800324 write_unlock_bh(&pn->hash_lock);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700325 lock_sock(sk);
326
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700327 if (po->pppoe_dev == dev
328 && sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700329 pppox_unbind_sock(sk);
330 sk->sk_state = PPPOX_ZOMBIE;
331 sk->sk_state_change(sk);
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700332 po->pppoe_dev = NULL;
333 dev_put(dev);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700334 }
335
336 release_sock(sk);
337 sock_put(sk);
338
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700339 /* Restart the process from the start of the current
340 * hash chain. We dropped locks so the world may have
341 * change from underneath us.
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700342 */
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700343
344 BUG_ON(pppoe_pernet(dev_net(dev)) == NULL);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800345 write_lock_bh(&pn->hash_lock);
346 po = pn->hash_table[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 }
348 }
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800349 write_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350}
351
352static int pppoe_device_event(struct notifier_block *this,
353 unsigned long event, void *ptr)
354{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800355 struct net_device *dev = (struct net_device *)ptr;
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200356
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 /* Only look at sockets that are using this specific device. */
358 switch (event) {
359 case NETDEV_CHANGEMTU:
360 /* A change in mtu is a bad thing, requiring
361 * LCP re-negotiation.
362 */
363
364 case NETDEV_GOING_DOWN:
365 case NETDEV_DOWN:
366 /* Find every socket on this device and kill it. */
367 pppoe_flush_dev(dev);
368 break;
369
370 default:
371 break;
372 };
373
374 return NOTIFY_DONE;
375}
376
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377static struct notifier_block pppoe_notifier = {
378 .notifier_call = pppoe_device_event,
379};
380
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381/************************************************************************
382 *
383 * Do the real work of receiving a PPPoE Session frame.
384 *
385 ***********************************************************************/
386static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb)
387{
388 struct pppox_sock *po = pppox_sk(sk);
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700389 struct pppox_sock *relay_po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700391 /* Backlog receive. Semantics of backlog rcv preclude any code from
392 * executing in lock_sock()/release_sock() bounds; meaning sk->sk_state
393 * can't change.
394 */
395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 if (sk->sk_state & PPPOX_BOUND) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 ppp_input(&po->chan, skb);
398 } else if (sk->sk_state & PPPOX_RELAY) {
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700399 relay_po = get_item_by_addr(sock_net(sk),
400 &po->pppoe_relay);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 if (relay_po == NULL)
402 goto abort_kfree;
403
404 if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0)
405 goto abort_put;
406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 if (!__pppoe_xmit(sk_pppox(relay_po), skb))
408 goto abort_put;
409 } else {
410 if (sock_queue_rcv_skb(sk, skb))
411 goto abort_kfree;
412 }
413
414 return NET_RX_SUCCESS;
415
416abort_put:
417 sock_put(sk_pppox(relay_po));
418
419abort_kfree:
420 kfree_skb(skb);
421 return NET_RX_DROP;
422}
423
424/************************************************************************
425 *
426 * Receive wrapper called in BH context.
427 *
428 ***********************************************************************/
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800429static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev,
430 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431{
432 struct pppoe_hdr *ph;
433 struct pppox_sock *po;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800434 struct pppoe_net *pn;
Herbert Xu392fdb02008-06-10 14:07:25 -0700435 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800437 skb = skb_share_check(skb, GFP_ATOMIC);
438 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 goto out;
440
Herbert Xu31bac442007-09-16 16:19:20 -0700441 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
442 goto drop;
443
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300444 ph = pppoe_hdr(skb);
Herbert Xu392fdb02008-06-10 14:07:25 -0700445 len = ntohs(ph->length);
446
447 skb_pull_rcsum(skb, sizeof(*ph));
448 if (skb->len < len)
449 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
David S. Miller263e69c2008-10-30 23:11:44 -0700451 if (pskb_trim_rcsum(skb, len))
Herbert Xu392fdb02008-06-10 14:07:25 -0700452 goto drop;
453
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800454 pn = pppoe_pernet(dev_net(dev));
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700455
456 /* Note that get_item does a sock_hold(), so sk_pppox(po)
457 * is known to be safe.
458 */
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800459 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
David S. Miller263e69c2008-10-30 23:11:44 -0700460 if (!po)
Herbert Xu392fdb02008-06-10 14:07:25 -0700461 goto drop;
462
463 return sk_receive_skb(sk_pppox(po), skb, 0);
464
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465drop:
466 kfree_skb(skb);
467out:
468 return NET_RX_DROP;
469}
470
471/************************************************************************
472 *
473 * Receive a PPPoE Discovery frame.
474 * This is solely for detection of PADT frames
475 *
476 ***********************************************************************/
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800477static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev,
478 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
480{
481 struct pppoe_hdr *ph;
482 struct pppox_sock *po;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800483 struct pppoe_net *pn;
Eric W. Biedermane730c152007-09-17 11:53:39 -0700484
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800485 skb = skb_share_check(skb, GFP_ATOMIC);
486 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 goto out;
488
Herbert Xubc6cffd12008-06-10 14:08:25 -0700489 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
490 goto abort;
491
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300492 ph = pppoe_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 if (ph->code != PADT_CODE)
494 goto abort;
495
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800496 pn = pppoe_pernet(dev_net(dev));
497 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 if (po) {
499 struct sock *sk = sk_pppox(po);
500
501 bh_lock_sock(sk);
502
503 /* If the user has locked the socket, just ignore
504 * the packet. With the way two rcv protocols hook into
505 * one socket family type, we cannot (easily) distinguish
506 * what kind of SKB it is during backlog rcv.
507 */
508 if (sock_owned_by_user(sk) == 0) {
509 /* We're no longer connect at the PPPOE layer,
510 * and must wait for ppp channel to disconnect us.
511 */
512 sk->sk_state = PPPOX_ZOMBIE;
513 }
514
515 bh_unlock_sock(sk);
516 sock_put(sk);
517 }
518
519abort:
520 kfree_skb(skb);
521out:
522 return NET_RX_SUCCESS; /* Lies... :-) */
523}
524
Stephen Hemminger7546dd92009-03-09 08:18:29 +0000525static struct packet_type pppoes_ptype __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -0800526 .type = cpu_to_be16(ETH_P_PPP_SES),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 .func = pppoe_rcv,
528};
529
Stephen Hemminger7546dd92009-03-09 08:18:29 +0000530static struct packet_type pppoed_ptype __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -0800531 .type = cpu_to_be16(ETH_P_PPP_DISC),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 .func = pppoe_disc_rcv,
533};
534
Stephen Hemminger7546dd92009-03-09 08:18:29 +0000535static struct proto pppoe_sk_proto __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 .name = "PPPOE",
537 .owner = THIS_MODULE,
538 .obj_size = sizeof(struct pppox_sock),
539};
540
541/***********************************************************************
542 *
543 * Initialize a new struct sock.
544 *
545 **********************************************************************/
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700546static int pppoe_create(struct net *net, struct socket *sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 struct sock *sk;
549
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700550 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 if (!sk)
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800552 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
554 sock_init_data(sock, sk);
555
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800556 sock->state = SS_UNCONNECTED;
557 sock->ops = &pppoe_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800559 sk->sk_backlog_rcv = pppoe_rcv_core;
560 sk->sk_state = PPPOX_NONE;
561 sk->sk_type = SOCK_STREAM;
562 sk->sk_family = PF_PPPOX;
563 sk->sk_protocol = PX_PROTO_OE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800565 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566}
567
568static int pppoe_release(struct socket *sock)
569{
570 struct sock *sk = sock->sk;
571 struct pppox_sock *po;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800572 struct pppoe_net *pn;
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700573 struct net *net = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
575 if (!sk)
576 return 0;
577
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700578 lock_sock(sk);
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800579 if (sock_flag(sk, SOCK_DEAD)) {
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700580 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 return -EBADF;
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700582 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700584 po = pppox_sk(sk);
585
586 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
587 dev_put(po->pppoe_dev);
588 po->pppoe_dev = NULL;
589 }
590
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 pppox_unbind_sock(sk);
592
593 /* Signal the death of the socket. */
594 sk->sk_state = PPPOX_DEAD;
595
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700596 net = sock_net(sk);
597 pn = pppoe_pernet(net);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700598
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800599 /*
600 * protect "po" from concurrent updates
601 * on pppoe_flush_dev
602 */
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700603 delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote,
604 po->pppoe_ifindex);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700605
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 sock_orphan(sk);
607 sock->sk = NULL;
608
609 skb_queue_purge(&sk->sk_receive_queue);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700610 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 sock_put(sk);
612
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700613 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614}
615
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
617 int sockaddr_len, int flags)
618{
619 struct sock *sk = sock->sk;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800620 struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 struct pppox_sock *po = pppox_sk(sk);
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700622 struct net_device *dev = NULL;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800623 struct pppoe_net *pn;
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700624 struct net *net = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 int error;
626
627 lock_sock(sk);
628
629 error = -EINVAL;
630 if (sp->sa_protocol != PX_PROTO_OE)
631 goto end;
632
633 /* Check for already bound sockets */
634 error = -EBUSY;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800635 if ((sk->sk_state & PPPOX_CONNECTED) &&
636 stage_session(sp->sa_addr.pppoe.sid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 goto end;
638
639 /* Check for already disconnected sockets, on attempts to disconnect */
640 error = -EALREADY;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800641 if ((sk->sk_state & PPPOX_DEAD) &&
642 !stage_session(sp->sa_addr.pppoe.sid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 goto end;
644
645 error = 0;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800646
647 /* Delete the old binding */
648 if (stage_session(po->pppoe_pa.sid)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 pppox_unbind_sock(sk);
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700650 pn = pppoe_pernet(sock_net(sk));
651 delete_item(pn, po->pppoe_pa.sid,
652 po->pppoe_pa.remote, po->pppoe_ifindex);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800653 if (po->pppoe_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 dev_put(po->pppoe_dev);
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700655 po->pppoe_dev = NULL;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800656 }
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700657
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 memset(sk_pppox(po) + 1, 0,
659 sizeof(struct pppox_sock) - sizeof(struct sock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 sk->sk_state = PPPOX_NONE;
661 }
662
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800663 /* Re-bind in session stage only */
664 if (stage_session(sp->sa_addr.pppoe.sid)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 error = -ENODEV;
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700666 net = sock_net(sk);
667 dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 if (!dev)
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700669 goto err_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
671 po->pppoe_dev = dev;
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800672 po->pppoe_ifindex = dev->ifindex;
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700673 pn = pppoe_pernet(net);
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800674 if (!(dev->flags & IFF_UP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 goto err_put;
Florian Zumbiehl74b885c2007-04-20 16:57:27 -0700676 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
678 memcpy(&po->pppoe_pa,
679 &sp->sa_addr.pppoe,
680 sizeof(struct pppoe_addr));
681
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700682 write_lock_bh(&pn->hash_lock);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800683 error = __set_item(pn, po);
684 write_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 if (error < 0)
686 goto err_put;
687
688 po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
689 dev->hard_header_len);
690
Michal Ostrowskic9aa6892006-09-27 16:11:25 -0700691 po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 po->chan.private = sk;
693 po->chan.ops = &pppoe_chan_ops;
694
Cyrill Gorcunovf5882c32009-01-21 15:55:40 -0800695 error = ppp_register_net_channel(dev_net(dev), &po->chan);
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700696 if (error) {
697 delete_item(pn, po->pppoe_pa.sid,
698 po->pppoe_pa.remote, po->pppoe_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 goto err_put;
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700700 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
702 sk->sk_state = PPPOX_CONNECTED;
703 }
704
705 po->num = sp->sa_addr.pppoe.sid;
706
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800707end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 release_sock(sk);
709 return error;
710err_put:
711 if (po->pppoe_dev) {
712 dev_put(po->pppoe_dev);
713 po->pppoe_dev = NULL;
714 }
715 goto end;
716}
717
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
719 int *usockaddr_len, int peer)
720{
721 int len = sizeof(struct sockaddr_pppox);
722 struct sockaddr_pppox sp;
723
724 sp.sa_family = AF_PPPOX;
725 sp.sa_protocol = PX_PROTO_OE;
726 memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa,
727 sizeof(struct pppoe_addr));
728
729 memcpy(uaddr, &sp, len);
730
731 *usockaddr_len = len;
732
733 return 0;
734}
735
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
737 unsigned long arg)
738{
739 struct sock *sk = sock->sk;
740 struct pppox_sock *po = pppox_sk(sk);
Florian Zumbiehl86c1dcf2007-07-30 17:48:23 -0700741 int val;
742 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
744 switch (cmd) {
745 case PPPIOCGMRU:
746 err = -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 if (!(sk->sk_state & PPPOX_CONNECTED))
748 break;
749
750 err = -EFAULT;
751 if (put_user(po->pppoe_dev->mtu -
752 sizeof(struct pppoe_hdr) -
753 PPP_HDRLEN,
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800754 (int __user *)arg))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 break;
756 err = 0;
757 break;
758
759 case PPPIOCSMRU:
760 err = -ENXIO;
761 if (!(sk->sk_state & PPPOX_CONNECTED))
762 break;
763
764 err = -EFAULT;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800765 if (get_user(val, (int __user *)arg))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 break;
767
768 if (val < (po->pppoe_dev->mtu
769 - sizeof(struct pppoe_hdr)
770 - PPP_HDRLEN))
771 err = 0;
772 else
773 err = -EINVAL;
774 break;
775
776 case PPPIOCSFLAGS:
777 err = -EFAULT;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800778 if (get_user(val, (int __user *)arg))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 break;
780 err = 0;
781 break;
782
783 case PPPOEIOCSFWD:
784 {
785 struct pppox_sock *relay_po;
786
787 err = -EBUSY;
788 if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD))
789 break;
790
791 err = -ENOTCONN;
792 if (!(sk->sk_state & PPPOX_CONNECTED))
793 break;
794
795 /* PPPoE address from the user specifies an outbound
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800796 PPPoE address which frames are forwarded to */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 err = -EFAULT;
798 if (copy_from_user(&po->pppoe_relay,
799 (void __user *)arg,
800 sizeof(struct sockaddr_pppox)))
801 break;
802
803 err = -EINVAL;
804 if (po->pppoe_relay.sa_family != AF_PPPOX ||
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800805 po->pppoe_relay.sa_protocol != PX_PROTO_OE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 break;
807
808 /* Check that the socket referenced by the address
809 actually exists. */
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800810 relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 if (!relay_po)
812 break;
813
814 sock_put(sk_pppox(relay_po));
815 sk->sk_state |= PPPOX_RELAY;
816 err = 0;
817 break;
818 }
819
820 case PPPOEIOCDFWD:
821 err = -EALREADY;
822 if (!(sk->sk_state & PPPOX_RELAY))
823 break;
824
825 sk->sk_state &= ~PPPOX_RELAY;
826 err = 0;
827 break;
828
Florian Zumbiehl86c1dcf2007-07-30 17:48:23 -0700829 default:
830 err = -ENOTTY;
831 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
833 return err;
834}
835
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400836static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 struct msghdr *m, size_t total_len)
838{
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700839 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 struct sock *sk = sock->sk;
841 struct pppox_sock *po = pppox_sk(sk);
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700842 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 struct pppoe_hdr hdr;
844 struct pppoe_hdr *ph;
845 struct net_device *dev;
846 char *start;
847
Florian Zumbiehl8aeca8f2007-07-30 17:49:13 -0700848 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) {
850 error = -ENOTCONN;
851 goto end;
852 }
853
854 hdr.ver = 1;
855 hdr.type = 1;
856 hdr.code = 0;
857 hdr.sid = po->num;
858
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 dev = po->pppoe_dev;
860
861 error = -EMSGSIZE;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800862 if (total_len > (dev->mtu + dev->hard_header_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 goto end;
864
865
866 skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32,
867 0, GFP_KERNEL);
868 if (!skb) {
869 error = -ENOMEM;
870 goto end;
871 }
872
873 /* Reserve space for headers. */
874 skb_reserve(skb, dev->hard_header_len);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700875 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876
877 skb->dev = dev;
878
879 skb->priority = sk->sk_priority;
Harvey Harrison09640e62009-02-01 00:45:17 -0800880 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800882 ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr));
883 start = (char *)&ph->tag[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884
885 error = memcpy_fromiovec(start, m->msg_iov, total_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 if (error < 0) {
887 kfree_skb(skb);
888 goto end;
889 }
890
891 error = total_len;
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700892 dev_hard_header(skb, dev, ETH_P_PPP_SES,
893 po->pppoe_pa.remote, NULL, total_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894
895 memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
896
897 ph->length = htons(total_len);
898
899 dev_queue_xmit(skb);
900
901end:
902 release_sock(sk);
903 return error;
904}
905
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906/************************************************************************
907 *
908 * xmit function for internal use.
909 *
910 ***********************************************************************/
911static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
912{
913 struct pppox_sock *po = pppox_sk(sk);
914 struct net_device *dev = po->pppoe_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 struct pppoe_hdr *ph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 int data_len = skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700918 /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP
919 * xmit operations conclude prior to an unregistration call. Thus
920 * sk->sk_state cannot change, so we don't need to do lock_sock().
921 * But, we also can't do a lock_sock since that introduces a potential
922 * deadlock as we'd reverse the lock ordering used when calling
923 * ppp_unregister_channel().
924 */
925
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
927 goto abort;
928
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 if (!dev)
930 goto abort;
931
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700932 /* Copy the data if there is no space for the header or if it's
933 * read-only.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 */
Herbert Xud9cc2042007-09-16 16:21:16 -0700935 if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 goto abort;
937
Herbert Xu9355ec22007-09-16 16:20:21 -0700938 __skb_push(skb, sizeof(*ph));
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700939 skb_reset_network_header(skb);
940
Herbert Xu9355ec22007-09-16 16:20:21 -0700941 ph = pppoe_hdr(skb);
942 ph->ver = 1;
943 ph->type = 1;
944 ph->code = 0;
945 ph->sid = po->num;
946 ph->length = htons(data_len);
947
Harvey Harrison09640e62009-02-01 00:45:17 -0800948 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700949 skb->dev = dev;
950
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700951 dev_hard_header(skb, dev, ETH_P_PPP_SES,
952 po->pppoe_pa.remote, NULL, data_len);
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700953
Herbert Xu21d0c832007-09-19 10:45:02 -0700954 dev_queue_xmit(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 return 1;
956
957abort:
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700958 kfree_skb(skb);
959 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960}
961
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962/************************************************************************
963 *
964 * xmit function called by generic PPP driver
965 * sends PPP frame over PPPoE socket
966 *
967 ***********************************************************************/
968static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
969{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800970 struct sock *sk = (struct sock *)chan->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 return __pppoe_xmit(sk, skb);
972}
973
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400974static struct ppp_channel_ops pppoe_chan_ops = {
975 .start_xmit = pppoe_xmit,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976};
977
978static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock,
979 struct msghdr *m, size_t total_len, int flags)
980{
981 struct sock *sk = sock->sk;
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700982 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
985 if (sk->sk_state & PPPOX_BOUND) {
986 error = -EIO;
987 goto end;
988 }
989
990 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
991 flags & MSG_DONTWAIT, &error);
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700992 if (error < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994
995 m->msg_namelen = 0;
996
997 if (skb) {
Stephen Hemminger2645a3c2008-06-20 21:58:02 -0700998 total_len = min_t(size_t, total_len, skb->len);
Herbert Xu392fdb02008-06-10 14:07:25 -0700999 error = skb_copy_datagram_iovec(skb, 0, m->msg_iov, total_len);
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -03001000 if (error == 0)
Herbert Xu392fdb02008-06-10 14:07:25 -07001001 error = total_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 }
1003
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -03001004 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005end:
1006 return error;
1007}
1008
1009#ifdef CONFIG_PROC_FS
1010static int pppoe_seq_show(struct seq_file *seq, void *v)
1011{
1012 struct pppox_sock *po;
1013 char *dev_name;
1014
1015 if (v == SEQ_START_TOKEN) {
1016 seq_puts(seq, "Id Address Device\n");
1017 goto out;
1018 }
1019
1020 po = v;
1021 dev_name = po->pppoe_pa.dev;
1022
Johannes Berge1749612008-10-27 15:59:26 -07001023 seq_printf(seq, "%08X %pM %8s\n",
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001024 po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025out:
1026 return 0;
1027}
1028
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001029static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030{
Florian Zumbiehlbfafb262007-04-20 16:56:31 -07001031 struct pppox_sock *po;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001032 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001034 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001035 po = pn->hash_table[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 while (po) {
1037 if (!pos--)
1038 goto out;
1039 po = po->next;
1040 }
1041 }
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001042
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043out:
1044 return po;
1045}
1046
1047static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001048 __acquires(pn->hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049{
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001050 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 loff_t l = *pos;
1052
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001053 read_lock_bh(&pn->hash_lock);
1054 return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055}
1056
1057static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1058{
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001059 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 struct pppox_sock *po;
1061
1062 ++*pos;
1063 if (v == SEQ_START_TOKEN) {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001064 po = pppoe_get_idx(pn, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 goto out;
1066 }
1067 po = v;
Jeff Garzik6aa20a22006-09-13 13:24:59 -04001068 if (po->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 po = po->next;
1070 else {
1071 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
1072
Eric Dumazet72fc9392009-07-28 23:43:08 +00001073 po = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 while (++hash < PPPOE_HASH_SIZE) {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001075 po = pn->hash_table[hash];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 if (po)
1077 break;
1078 }
1079 }
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001080
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081out:
1082 return po;
1083}
1084
1085static void pppoe_seq_stop(struct seq_file *seq, void *v)
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001086 __releases(pn->hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087{
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001088 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001089 read_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090}
1091
Jan Engelhardt4101dec2009-01-14 13:52:18 -08001092static const struct seq_operations pppoe_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 .start = pppoe_seq_start,
1094 .next = pppoe_seq_next,
1095 .stop = pppoe_seq_stop,
1096 .show = pppoe_seq_show,
1097};
1098
1099static int pppoe_seq_open(struct inode *inode, struct file *file)
1100{
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001101 return seq_open_net(inode, file, &pppoe_seq_ops,
1102 sizeof(struct seq_net_private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103}
1104
Arjan van de Vend54b1fd2007-02-12 00:55:34 -08001105static const struct file_operations pppoe_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 .owner = THIS_MODULE,
1107 .open = pppoe_seq_open,
1108 .read = seq_read,
1109 .llseek = seq_lseek,
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001110 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111};
1112
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113#endif /* CONFIG_PROC_FS */
1114
David S. Miller17ba15f2005-12-27 20:57:40 -08001115static const struct proto_ops pppoe_ops = {
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001116 .family = AF_PPPOX,
1117 .owner = THIS_MODULE,
1118 .release = pppoe_release,
1119 .bind = sock_no_bind,
1120 .connect = pppoe_connect,
1121 .socketpair = sock_no_socketpair,
1122 .accept = sock_no_accept,
1123 .getname = pppoe_getname,
1124 .poll = datagram_poll,
1125 .listen = sock_no_listen,
1126 .shutdown = sock_no_shutdown,
1127 .setsockopt = sock_no_setsockopt,
1128 .getsockopt = sock_no_getsockopt,
1129 .sendmsg = pppoe_sendmsg,
1130 .recvmsg = pppoe_recvmsg,
1131 .mmap = sock_no_mmap,
1132 .ioctl = pppox_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133};
1134
1135static struct pppox_proto pppoe_proto = {
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001136 .create = pppoe_create,
1137 .ioctl = pppoe_ioctl,
1138 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139};
1140
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001141static __net_init int pppoe_init_net(struct net *net)
1142{
1143 struct pppoe_net *pn;
1144 struct proc_dir_entry *pde;
1145 int err;
1146
1147 pn = kzalloc(sizeof(*pn), GFP_KERNEL);
1148 if (!pn)
1149 return -ENOMEM;
1150
1151 rwlock_init(&pn->hash_lock);
1152
1153 err = net_assign_generic(net, pppoe_net_id, pn);
1154 if (err)
1155 goto out;
1156
1157 pde = proc_net_fops_create(net, "pppoe", S_IRUGO, &pppoe_seq_fops);
1158#ifdef CONFIG_PROC_FS
1159 if (!pde) {
1160 err = -ENOMEM;
1161 goto out;
1162 }
1163#endif
1164
1165 return 0;
1166
1167out:
1168 kfree(pn);
1169 return err;
1170}
1171
1172static __net_exit void pppoe_exit_net(struct net *net)
1173{
1174 struct pppoe_net *pn;
1175
1176 proc_net_remove(net, "pppoe");
1177 pn = net_generic(net, pppoe_net_id);
1178 /*
1179 * if someone has cached our net then
1180 * further net_generic call will return NULL
1181 */
1182 net_assign_generic(net, pppoe_net_id, NULL);
1183 kfree(pn);
1184}
1185
Alexey Dobriyan00129852009-02-09 18:05:16 -08001186static struct pernet_operations pppoe_net_ops = {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001187 .init = pppoe_init_net,
1188 .exit = pppoe_exit_net,
1189};
1190
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191static int __init pppoe_init(void)
1192{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001193 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
Cyrill Gorcunov07f66422009-08-12 16:39:16 -07001195 err = register_pernet_gen_device(&pppoe_net_id, &pppoe_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 if (err)
1197 goto out;
1198
Cyrill Gorcunov07f66422009-08-12 16:39:16 -07001199 err = proto_register(&pppoe_sk_proto, 0);
1200 if (err)
1201 goto out_unregister_net_ops;
1202
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001203 err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 if (err)
1205 goto out_unregister_pppoe_proto;
1206
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 dev_add_pack(&pppoes_ptype);
1208 dev_add_pack(&pppoed_ptype);
1209 register_netdevice_notifier(&pppoe_notifier);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001210
1211 return 0;
1212
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213out_unregister_pppoe_proto:
1214 proto_unregister(&pppoe_sk_proto);
Cyrill Gorcunov07f66422009-08-12 16:39:16 -07001215out_unregister_net_ops:
1216 unregister_pernet_gen_device(pppoe_net_id, &pppoe_net_ops);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001217out:
1218 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219}
1220
1221static void __exit pppoe_exit(void)
1222{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 unregister_netdevice_notifier(&pppoe_notifier);
Cyrill Gorcunov07f66422009-08-12 16:39:16 -07001224 dev_remove_pack(&pppoed_ptype);
1225 dev_remove_pack(&pppoes_ptype);
1226 unregister_pppox_proto(PX_PROTO_OE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 proto_unregister(&pppoe_sk_proto);
Cyrill Gorcunov07f66422009-08-12 16:39:16 -07001228 unregister_pernet_gen_device(pppoe_net_id, &pppoe_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229}
1230
1231module_init(pppoe_init);
1232module_exit(pppoe_exit);
1233
1234MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
1235MODULE_DESCRIPTION("PPP over Ethernet driver");
1236MODULE_LICENSE("GPL");
1237MODULE_ALIAS_NETPROTO(PF_PPPOX);