blob: 82ee6ed954cb84272aa41be0fa3ad12eb6c64e2c [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>
Paul Mackerras4b32da2b2012-03-04 12:56:55 +000075#include <linux/ppp-ioctl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070092static 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;
stephen hemmingerd7100da2010-08-04 07:34:36 +000095static const struct ppp_channel_ops pppoe_chan_ops;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -080096
97/* per-net private data for this module */
Eric Dumazetf99189b2009-11-17 10:42:49 +000098static int pppoe_net_id __read_mostly;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -080099struct pppoe_net {
100 /*
101 * we could use _single_ hash table for all
102 * nets by injecting net id into the hash but
103 * it would increase hash chains and add
104 * a few additional math comparations messy
105 * as well, moreover in case of SMP less locking
106 * controversy here
107 */
108 struct pppox_sock *hash_table[PPPOE_HASH_SIZE];
109 rwlock_t hash_lock;
110};
111
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800112/*
113 * PPPoE could be in the following stages:
114 * 1) Discovery stage (to obtain remote MAC and Session ID)
115 * 2) Session stage (MAC and SID are known)
116 *
117 * Ethernet frames have a special tag for this but
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300118 * we use simpler approach based on session id
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800119 */
120static inline bool stage_session(__be16 sid)
121{
122 return sid != 0;
123}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800125static inline struct pppoe_net *pppoe_pernet(struct net *net)
126{
127 BUG_ON(!net);
128
129 return net_generic(net, pppoe_net_id);
130}
131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b)
133{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800134 return a->sid == b->sid && !memcmp(a->remote, b->remote, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135}
136
Al Virob963dc12007-08-23 02:55:33 -0400137static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800139 return a->sid == sid && !memcmp(a->remote, addr, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800142#if 8 % PPPOE_HASH_BITS
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700143#error 8 must be a multiple of PPPOE_HASH_BITS
144#endif
145
Al Virob963dc12007-08-23 02:55:33 -0400146static int hash_item(__be16 sid, unsigned char *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147{
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700148 unsigned char hash = 0;
149 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800151 for (i = 0; i < ETH_ALEN; i++)
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700152 hash ^= addr[i];
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800153 for (i = 0; i < sizeof(sid_t) * 8; i += 8)
154 hash ^= (__force __u32)sid >> i;
155 for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;)
156 hash ^= hash >> i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800158 return hash & PPPOE_HASH_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159}
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161/**********************************************************************
162 *
163 * Set/get/delete/rehash items (internal versions)
164 *
165 **********************************************************************/
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800166static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid,
167 unsigned char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{
169 int hash = hash_item(sid, addr);
170 struct pppox_sock *ret;
171
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800172 ret = pn->hash_table[hash];
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800173 while (ret) {
174 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
175 ret->pppoe_ifindex == ifindex)
176 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800178 ret = ret->next;
179 }
180
181 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182}
183
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800184static int __set_item(struct pppoe_net *pn, struct pppox_sock *po)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185{
186 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
187 struct pppox_sock *ret;
188
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800189 ret = pn->hash_table[hash];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 while (ret) {
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800191 if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) &&
192 ret->pppoe_ifindex == po->pppoe_ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 return -EALREADY;
194
195 ret = ret->next;
196 }
197
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800198 po->next = pn->hash_table[hash];
199 pn->hash_table[hash] = po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
201 return 0;
202}
203
Rami Rosen3b12bb62012-05-17 05:04:50 +0000204static void __delete_item(struct pppoe_net *pn, __be16 sid,
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800205 char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206{
207 int hash = hash_item(sid, addr);
208 struct pppox_sock *ret, **src;
209
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800210 ret = pn->hash_table[hash];
211 src = &pn->hash_table[hash];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213 while (ret) {
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800214 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
215 ret->pppoe_ifindex == ifindex) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 *src = ret->next;
217 break;
218 }
219
220 src = &ret->next;
221 ret = ret->next;
222 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223}
224
225/**********************************************************************
226 *
227 * Set/get/delete/rehash items
228 *
229 **********************************************************************/
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800230static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid,
231 unsigned char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232{
233 struct pppox_sock *po;
234
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800235 read_lock_bh(&pn->hash_lock);
236 po = __get_item(pn, sid, addr, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 if (po)
238 sock_hold(sk_pppox(po));
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800239 read_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241 return po;
242}
243
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800244static inline struct pppox_sock *get_item_by_addr(struct net *net,
245 struct sockaddr_pppox *sp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700247 struct net_device *dev;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800248 struct pppoe_net *pn;
Eric Dumazet1178f662009-11-01 19:51:22 +0000249 struct pppox_sock *pppox_sock = NULL;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800250
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800251 int ifindex;
252
Eric Dumazet1178f662009-11-01 19:51:22 +0000253 rcu_read_lock();
254 dev = dev_get_by_name_rcu(net, sp->sa_addr.pppoe.dev);
255 if (dev) {
256 ifindex = dev->ifindex;
Jiri Pirkobe9e9692010-04-26 01:46:12 +0000257 pn = pppoe_pernet(net);
Eric Dumazet1178f662009-11-01 19:51:22 +0000258 pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid,
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800259 sp->sa_addr.pppoe.remote, ifindex);
Eric Dumazet1178f662009-11-01 19:51:22 +0000260 }
261 rcu_read_unlock();
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800262 return pppox_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263}
264
Rami Rosen3b12bb62012-05-17 05:04:50 +0000265static inline void delete_item(struct pppoe_net *pn, __be16 sid,
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800266 char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800268 write_lock_bh(&pn->hash_lock);
Rami Rosen3b12bb62012-05-17 05:04:50 +0000269 __delete_item(pn, sid, addr, ifindex);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800270 write_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271}
272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273/***************************************************************************
274 *
275 * Handler for device events.
276 * Certain device events require that sockets be unconnected.
277 *
278 **************************************************************************/
279
280static void pppoe_flush_dev(struct net_device *dev)
281{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800282 struct pppoe_net *pn;
283 int i;
284
Dan Carpentera5e93152010-05-22 10:27:48 +0000285 pn = pppoe_pernet(dev_net(dev));
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800286 write_lock_bh(&pn->hash_lock);
287 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
288 struct pppox_sock *po = pn->hash_table[i];
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700289 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700291 while (po) {
292 while (po && po->pppoe_dev != dev) {
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700293 po = po->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 }
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700295
296 if (!po)
297 break;
298
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800299 sk = sk_pppox(po);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700300
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700301 /* We always grab the socket lock, followed by the
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700302 * hash_lock, in that order. Since we should hold the
303 * sock lock while doing any unbinding, we need to
304 * release the lock we're holding. Hold a reference to
305 * the sock so it doesn't disappear as we're jumping
306 * between locks.
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700307 */
308
309 sock_hold(sk);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800310 write_unlock_bh(&pn->hash_lock);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700311 lock_sock(sk);
312
Joe Perches8e95a202009-12-03 07:58:21 +0000313 if (po->pppoe_dev == dev &&
Ulrich Weberae07b0b2011-04-06 14:04:49 -0700314 sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) {
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700315 pppox_unbind_sock(sk);
316 sk->sk_state = PPPOX_ZOMBIE;
317 sk->sk_state_change(sk);
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700318 po->pppoe_dev = NULL;
319 dev_put(dev);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700320 }
321
322 release_sock(sk);
323 sock_put(sk);
324
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700325 /* Restart the process from the start of the current
326 * hash chain. We dropped locks so the world may have
327 * change from underneath us.
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700328 */
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700329
330 BUG_ON(pppoe_pernet(dev_net(dev)) == NULL);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800331 write_lock_bh(&pn->hash_lock);
332 po = pn->hash_table[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 }
334 }
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800335 write_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336}
337
338static int pppoe_device_event(struct notifier_block *this,
339 unsigned long event, void *ptr)
340{
Jiri Pirko351638e2013-05-28 01:30:21 +0000341 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200342
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 /* Only look at sockets that are using this specific device. */
344 switch (event) {
David S. Miller680ba7c2011-07-18 11:48:28 -0700345 case NETDEV_CHANGEADDR:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 case NETDEV_CHANGEMTU:
David S. Miller680ba7c2011-07-18 11:48:28 -0700347 /* A change in mtu or address is a bad thing, requiring
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 * LCP re-negotiation.
349 */
350
351 case NETDEV_GOING_DOWN:
352 case NETDEV_DOWN:
353 /* Find every socket on this device and kill it. */
354 pppoe_flush_dev(dev);
355 break;
356
357 default:
358 break;
Joe Perchesee289b62010-05-17 22:47:34 -0700359 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
361 return NOTIFY_DONE;
362}
363
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364static struct notifier_block pppoe_notifier = {
365 .notifier_call = pppoe_device_event,
366};
367
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368/************************************************************************
369 *
370 * Do the real work of receiving a PPPoE Session frame.
371 *
372 ***********************************************************************/
373static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb)
374{
375 struct pppox_sock *po = pppox_sk(sk);
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700376 struct pppox_sock *relay_po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700378 /* Backlog receive. Semantics of backlog rcv preclude any code from
379 * executing in lock_sock()/release_sock() bounds; meaning sk->sk_state
380 * can't change.
381 */
382
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 if (sk->sk_state & PPPOX_BOUND) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 ppp_input(&po->chan, skb);
385 } else if (sk->sk_state & PPPOX_RELAY) {
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700386 relay_po = get_item_by_addr(sock_net(sk),
387 &po->pppoe_relay);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 if (relay_po == NULL)
389 goto abort_kfree;
390
391 if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0)
392 goto abort_put;
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 if (!__pppoe_xmit(sk_pppox(relay_po), skb))
395 goto abort_put;
396 } else {
397 if (sock_queue_rcv_skb(sk, skb))
398 goto abort_kfree;
399 }
400
401 return NET_RX_SUCCESS;
402
403abort_put:
404 sock_put(sk_pppox(relay_po));
405
406abort_kfree:
407 kfree_skb(skb);
408 return NET_RX_DROP;
409}
410
411/************************************************************************
412 *
413 * Receive wrapper called in BH context.
414 *
415 ***********************************************************************/
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800416static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev,
417 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418{
419 struct pppoe_hdr *ph;
420 struct pppox_sock *po;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800421 struct pppoe_net *pn;
Herbert Xu392fdb02008-06-10 14:07:25 -0700422 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800424 skb = skb_share_check(skb, GFP_ATOMIC);
425 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 goto out;
427
Herbert Xu31bac442007-09-16 16:19:20 -0700428 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
429 goto drop;
430
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300431 ph = pppoe_hdr(skb);
Herbert Xu392fdb02008-06-10 14:07:25 -0700432 len = ntohs(ph->length);
433
434 skb_pull_rcsum(skb, sizeof(*ph));
435 if (skb->len < len)
436 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
David S. Miller263e69c2008-10-30 23:11:44 -0700438 if (pskb_trim_rcsum(skb, len))
Herbert Xu392fdb02008-06-10 14:07:25 -0700439 goto drop;
440
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800441 pn = pppoe_pernet(dev_net(dev));
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700442
443 /* Note that get_item does a sock_hold(), so sk_pppox(po)
444 * is known to be safe.
445 */
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800446 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
David S. Miller263e69c2008-10-30 23:11:44 -0700447 if (!po)
Herbert Xu392fdb02008-06-10 14:07:25 -0700448 goto drop;
449
450 return sk_receive_skb(sk_pppox(po), skb, 0);
451
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452drop:
453 kfree_skb(skb);
454out:
455 return NET_RX_DROP;
456}
457
458/************************************************************************
459 *
460 * Receive a PPPoE Discovery frame.
461 * This is solely for detection of PADT frames
462 *
463 ***********************************************************************/
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800464static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev,
465 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
467{
468 struct pppoe_hdr *ph;
469 struct pppox_sock *po;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800470 struct pppoe_net *pn;
Eric W. Biedermane730c152007-09-17 11:53:39 -0700471
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800472 skb = skb_share_check(skb, GFP_ATOMIC);
473 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 goto out;
475
Herbert Xubc6cffd12008-06-10 14:08:25 -0700476 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
477 goto abort;
478
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300479 ph = pppoe_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 if (ph->code != PADT_CODE)
481 goto abort;
482
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800483 pn = pppoe_pernet(dev_net(dev));
484 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 if (po) {
486 struct sock *sk = sk_pppox(po);
487
488 bh_lock_sock(sk);
489
490 /* If the user has locked the socket, just ignore
491 * the packet. With the way two rcv protocols hook into
492 * one socket family type, we cannot (easily) distinguish
493 * what kind of SKB it is during backlog rcv.
494 */
495 if (sock_owned_by_user(sk) == 0) {
496 /* We're no longer connect at the PPPOE layer,
497 * and must wait for ppp channel to disconnect us.
498 */
499 sk->sk_state = PPPOX_ZOMBIE;
500 }
501
502 bh_unlock_sock(sk);
503 sock_put(sk);
504 }
505
506abort:
507 kfree_skb(skb);
508out:
509 return NET_RX_SUCCESS; /* Lies... :-) */
510}
511
Stephen Hemminger7546dd92009-03-09 08:18:29 +0000512static struct packet_type pppoes_ptype __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -0800513 .type = cpu_to_be16(ETH_P_PPP_SES),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 .func = pppoe_rcv,
515};
516
Stephen Hemminger7546dd92009-03-09 08:18:29 +0000517static struct packet_type pppoed_ptype __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -0800518 .type = cpu_to_be16(ETH_P_PPP_DISC),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 .func = pppoe_disc_rcv,
520};
521
Stephen Hemminger7546dd92009-03-09 08:18:29 +0000522static struct proto pppoe_sk_proto __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 .name = "PPPOE",
524 .owner = THIS_MODULE,
525 .obj_size = sizeof(struct pppox_sock),
526};
527
528/***********************************************************************
529 *
530 * Initialize a new struct sock.
531 *
532 **********************************************************************/
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700533static int pppoe_create(struct net *net, struct socket *sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 struct sock *sk;
536
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700537 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 if (!sk)
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800539 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
541 sock_init_data(sock, sk);
542
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800543 sock->state = SS_UNCONNECTED;
544 sock->ops = &pppoe_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800546 sk->sk_backlog_rcv = pppoe_rcv_core;
547 sk->sk_state = PPPOX_NONE;
548 sk->sk_type = SOCK_STREAM;
549 sk->sk_family = PF_PPPOX;
550 sk->sk_protocol = PX_PROTO_OE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800552 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553}
554
555static int pppoe_release(struct socket *sock)
556{
557 struct sock *sk = sock->sk;
558 struct pppox_sock *po;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800559 struct pppoe_net *pn;
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700560 struct net *net = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
562 if (!sk)
563 return 0;
564
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700565 lock_sock(sk);
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800566 if (sock_flag(sk, SOCK_DEAD)) {
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700567 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 return -EBADF;
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700569 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700571 po = pppox_sk(sk);
572
Xiaodong Xu2b018d52012-09-22 00:09:32 +0000573 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) {
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700574 dev_put(po->pppoe_dev);
575 po->pppoe_dev = NULL;
576 }
577
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 pppox_unbind_sock(sk);
579
580 /* Signal the death of the socket. */
581 sk->sk_state = PPPOX_DEAD;
582
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700583 net = sock_net(sk);
584 pn = pppoe_pernet(net);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700585
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800586 /*
587 * protect "po" from concurrent updates
588 * on pppoe_flush_dev
589 */
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700590 delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote,
591 po->pppoe_ifindex);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700592
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 sock_orphan(sk);
594 sock->sk = NULL;
595
596 skb_queue_purge(&sk->sk_receive_queue);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700597 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 sock_put(sk);
599
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700600 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601}
602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
604 int sockaddr_len, int flags)
605{
606 struct sock *sk = sock->sk;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800607 struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 struct pppox_sock *po = pppox_sk(sk);
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700609 struct net_device *dev = NULL;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800610 struct pppoe_net *pn;
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700611 struct net *net = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 int error;
613
614 lock_sock(sk);
615
616 error = -EINVAL;
617 if (sp->sa_protocol != PX_PROTO_OE)
618 goto end;
619
620 /* Check for already bound sockets */
621 error = -EBUSY;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800622 if ((sk->sk_state & PPPOX_CONNECTED) &&
623 stage_session(sp->sa_addr.pppoe.sid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 goto end;
625
626 /* Check for already disconnected sockets, on attempts to disconnect */
627 error = -EALREADY;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800628 if ((sk->sk_state & PPPOX_DEAD) &&
629 !stage_session(sp->sa_addr.pppoe.sid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 goto end;
631
632 error = 0;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800633
634 /* Delete the old binding */
635 if (stage_session(po->pppoe_pa.sid)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 pppox_unbind_sock(sk);
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700637 pn = pppoe_pernet(sock_net(sk));
638 delete_item(pn, po->pppoe_pa.sid,
639 po->pppoe_pa.remote, po->pppoe_ifindex);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800640 if (po->pppoe_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 dev_put(po->pppoe_dev);
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700642 po->pppoe_dev = NULL;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800643 }
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700644
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 memset(sk_pppox(po) + 1, 0,
646 sizeof(struct pppox_sock) - sizeof(struct sock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 sk->sk_state = PPPOX_NONE;
648 }
649
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800650 /* Re-bind in session stage only */
651 if (stage_session(sp->sa_addr.pppoe.sid)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 error = -ENODEV;
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700653 net = sock_net(sk);
654 dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 if (!dev)
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700656 goto err_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
658 po->pppoe_dev = dev;
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800659 po->pppoe_ifindex = dev->ifindex;
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700660 pn = pppoe_pernet(net);
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800661 if (!(dev->flags & IFF_UP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 goto err_put;
Florian Zumbiehl74b885c2007-04-20 16:57:27 -0700663 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664
665 memcpy(&po->pppoe_pa,
666 &sp->sa_addr.pppoe,
667 sizeof(struct pppoe_addr));
668
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700669 write_lock_bh(&pn->hash_lock);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800670 error = __set_item(pn, po);
671 write_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 if (error < 0)
673 goto err_put;
674
675 po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
676 dev->hard_header_len);
677
Michal Ostrowskic9aa6892006-09-27 16:11:25 -0700678 po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 po->chan.private = sk;
680 po->chan.ops = &pppoe_chan_ops;
681
Cyrill Gorcunovf5882c32009-01-21 15:55:40 -0800682 error = ppp_register_net_channel(dev_net(dev), &po->chan);
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700683 if (error) {
684 delete_item(pn, po->pppoe_pa.sid,
685 po->pppoe_pa.remote, po->pppoe_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 goto err_put;
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700687 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
689 sk->sk_state = PPPOX_CONNECTED;
690 }
691
692 po->num = sp->sa_addr.pppoe.sid;
693
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800694end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 release_sock(sk);
696 return error;
697err_put:
698 if (po->pppoe_dev) {
699 dev_put(po->pppoe_dev);
700 po->pppoe_dev = NULL;
701 }
702 goto end;
703}
704
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
706 int *usockaddr_len, int peer)
707{
708 int len = sizeof(struct sockaddr_pppox);
709 struct sockaddr_pppox sp;
710
711 sp.sa_family = AF_PPPOX;
712 sp.sa_protocol = PX_PROTO_OE;
713 memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa,
714 sizeof(struct pppoe_addr));
715
716 memcpy(uaddr, &sp, len);
717
718 *usockaddr_len = len;
719
720 return 0;
721}
722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
724 unsigned long arg)
725{
726 struct sock *sk = sock->sk;
727 struct pppox_sock *po = pppox_sk(sk);
Florian Zumbiehl86c1dcf2007-07-30 17:48:23 -0700728 int val;
729 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
731 switch (cmd) {
732 case PPPIOCGMRU:
733 err = -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 if (!(sk->sk_state & PPPOX_CONNECTED))
735 break;
736
737 err = -EFAULT;
738 if (put_user(po->pppoe_dev->mtu -
739 sizeof(struct pppoe_hdr) -
740 PPP_HDRLEN,
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800741 (int __user *)arg))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 break;
743 err = 0;
744 break;
745
746 case PPPIOCSMRU:
747 err = -ENXIO;
748 if (!(sk->sk_state & PPPOX_CONNECTED))
749 break;
750
751 err = -EFAULT;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800752 if (get_user(val, (int __user *)arg))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 break;
754
755 if (val < (po->pppoe_dev->mtu
756 - sizeof(struct pppoe_hdr)
757 - PPP_HDRLEN))
758 err = 0;
759 else
760 err = -EINVAL;
761 break;
762
763 case PPPIOCSFLAGS:
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 err = 0;
768 break;
769
770 case PPPOEIOCSFWD:
771 {
772 struct pppox_sock *relay_po;
773
774 err = -EBUSY;
775 if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD))
776 break;
777
778 err = -ENOTCONN;
779 if (!(sk->sk_state & PPPOX_CONNECTED))
780 break;
781
782 /* PPPoE address from the user specifies an outbound
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800783 PPPoE address which frames are forwarded to */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 err = -EFAULT;
785 if (copy_from_user(&po->pppoe_relay,
786 (void __user *)arg,
787 sizeof(struct sockaddr_pppox)))
788 break;
789
790 err = -EINVAL;
791 if (po->pppoe_relay.sa_family != AF_PPPOX ||
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800792 po->pppoe_relay.sa_protocol != PX_PROTO_OE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 break;
794
795 /* Check that the socket referenced by the address
796 actually exists. */
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800797 relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 if (!relay_po)
799 break;
800
801 sock_put(sk_pppox(relay_po));
802 sk->sk_state |= PPPOX_RELAY;
803 err = 0;
804 break;
805 }
806
807 case PPPOEIOCDFWD:
808 err = -EALREADY;
809 if (!(sk->sk_state & PPPOX_RELAY))
810 break;
811
812 sk->sk_state &= ~PPPOX_RELAY;
813 err = 0;
814 break;
815
Florian Zumbiehl86c1dcf2007-07-30 17:48:23 -0700816 default:
817 err = -ENOTTY;
818 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
820 return err;
821}
822
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400823static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 struct msghdr *m, size_t total_len)
825{
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700826 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 struct sock *sk = sock->sk;
828 struct pppox_sock *po = pppox_sk(sk);
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700829 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 struct pppoe_hdr hdr;
831 struct pppoe_hdr *ph;
832 struct net_device *dev;
833 char *start;
834
Florian Zumbiehl8aeca8f2007-07-30 17:49:13 -0700835 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) {
837 error = -ENOTCONN;
838 goto end;
839 }
840
841 hdr.ver = 1;
842 hdr.type = 1;
843 hdr.code = 0;
844 hdr.sid = po->num;
845
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 dev = po->pppoe_dev;
847
848 error = -EMSGSIZE;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800849 if (total_len > (dev->mtu + dev->hard_header_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 goto end;
851
852
853 skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32,
854 0, GFP_KERNEL);
855 if (!skb) {
856 error = -ENOMEM;
857 goto end;
858 }
859
860 /* Reserve space for headers. */
861 skb_reserve(skb, dev->hard_header_len);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700862 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
864 skb->dev = dev;
865
866 skb->priority = sk->sk_priority;
Harvey Harrison09640e62009-02-01 00:45:17 -0800867 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800869 ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr));
870 start = (char *)&ph->tag[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
872 error = memcpy_fromiovec(start, m->msg_iov, total_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 if (error < 0) {
874 kfree_skb(skb);
875 goto end;
876 }
877
878 error = total_len;
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700879 dev_hard_header(skb, dev, ETH_P_PPP_SES,
880 po->pppoe_pa.remote, NULL, total_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881
882 memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
883
884 ph->length = htons(total_len);
885
886 dev_queue_xmit(skb);
887
888end:
889 release_sock(sk);
890 return error;
891}
892
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893/************************************************************************
894 *
895 * xmit function for internal use.
896 *
897 ***********************************************************************/
898static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
899{
900 struct pppox_sock *po = pppox_sk(sk);
901 struct net_device *dev = po->pppoe_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 struct pppoe_hdr *ph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 int data_len = skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904
Michal Ostrowskifb64bb52009-10-26 16:23:20 -0700905 /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP
906 * xmit operations conclude prior to an unregistration call. Thus
907 * sk->sk_state cannot change, so we don't need to do lock_sock().
908 * But, we also can't do a lock_sock since that introduces a potential
909 * deadlock as we'd reverse the lock ordering used when calling
910 * ppp_unregister_channel().
911 */
912
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
914 goto abort;
915
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 if (!dev)
917 goto abort;
918
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700919 /* Copy the data if there is no space for the header or if it's
920 * read-only.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 */
Herbert Xud9cc2042007-09-16 16:21:16 -0700922 if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 goto abort;
924
Herbert Xu9355ec22007-09-16 16:20:21 -0700925 __skb_push(skb, sizeof(*ph));
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700926 skb_reset_network_header(skb);
927
Herbert Xu9355ec22007-09-16 16:20:21 -0700928 ph = pppoe_hdr(skb);
929 ph->ver = 1;
930 ph->type = 1;
931 ph->code = 0;
932 ph->sid = po->num;
933 ph->length = htons(data_len);
934
Harvey Harrison09640e62009-02-01 00:45:17 -0800935 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700936 skb->dev = dev;
937
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700938 dev_hard_header(skb, dev, ETH_P_PPP_SES,
939 po->pppoe_pa.remote, NULL, data_len);
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700940
Herbert Xu21d0c832007-09-19 10:45:02 -0700941 dev_queue_xmit(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 return 1;
943
944abort:
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700945 kfree_skb(skb);
Andrej Ota2a27a032010-12-12 15:06:16 -0800946 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947}
948
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949/************************************************************************
950 *
951 * xmit function called by generic PPP driver
952 * sends PPP frame over PPPoE socket
953 *
954 ***********************************************************************/
955static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
956{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800957 struct sock *sk = (struct sock *)chan->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 return __pppoe_xmit(sk, skb);
959}
960
stephen hemmingerd7100da2010-08-04 07:34:36 +0000961static const struct ppp_channel_ops pppoe_chan_ops = {
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400962 .start_xmit = pppoe_xmit,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963};
964
965static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock,
966 struct msghdr *m, size_t total_len, int flags)
967{
968 struct sock *sk = sock->sk;
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700969 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971
972 if (sk->sk_state & PPPOX_BOUND) {
973 error = -EIO;
974 goto end;
975 }
976
977 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
978 flags & MSG_DONTWAIT, &error);
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700979 if (error < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 if (skb) {
Stephen Hemminger2645a3c2008-06-20 21:58:02 -0700983 total_len = min_t(size_t, total_len, skb->len);
Herbert Xu392fdb02008-06-10 14:07:25 -0700984 error = skb_copy_datagram_iovec(skb, 0, m->msg_iov, total_len);
Eric Dumazet968d7012012-05-18 20:23:00 +0000985 if (error == 0) {
986 consume_skb(skb);
987 return total_len;
988 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 }
990
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300991 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992end:
993 return error;
994}
995
996#ifdef CONFIG_PROC_FS
997static int pppoe_seq_show(struct seq_file *seq, void *v)
998{
999 struct pppox_sock *po;
1000 char *dev_name;
1001
1002 if (v == SEQ_START_TOKEN) {
1003 seq_puts(seq, "Id Address Device\n");
1004 goto out;
1005 }
1006
1007 po = v;
1008 dev_name = po->pppoe_pa.dev;
1009
Johannes Berge1749612008-10-27 15:59:26 -07001010 seq_printf(seq, "%08X %pM %8s\n",
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001011 po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012out:
1013 return 0;
1014}
1015
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001016static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017{
Florian Zumbiehlbfafb262007-04-20 16:56:31 -07001018 struct pppox_sock *po;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001019 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001021 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001022 po = pn->hash_table[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 while (po) {
1024 if (!pos--)
1025 goto out;
1026 po = po->next;
1027 }
1028 }
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001029
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030out:
1031 return po;
1032}
1033
1034static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001035 __acquires(pn->hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036{
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001037 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 loff_t l = *pos;
1039
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001040 read_lock_bh(&pn->hash_lock);
1041 return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042}
1043
1044static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1045{
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001046 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 struct pppox_sock *po;
1048
1049 ++*pos;
1050 if (v == SEQ_START_TOKEN) {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001051 po = pppoe_get_idx(pn, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 goto out;
1053 }
1054 po = v;
Jeff Garzik6aa20a22006-09-13 13:24:59 -04001055 if (po->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 po = po->next;
1057 else {
1058 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
1059
Eric Dumazet72fc9392009-07-28 23:43:08 +00001060 po = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 while (++hash < PPPOE_HASH_SIZE) {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001062 po = pn->hash_table[hash];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 if (po)
1064 break;
1065 }
1066 }
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001067
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068out:
1069 return po;
1070}
1071
1072static void pppoe_seq_stop(struct seq_file *seq, void *v)
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001073 __releases(pn->hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074{
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001075 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001076 read_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077}
1078
Jan Engelhardt4101dec2009-01-14 13:52:18 -08001079static const struct seq_operations pppoe_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 .start = pppoe_seq_start,
1081 .next = pppoe_seq_next,
1082 .stop = pppoe_seq_stop,
1083 .show = pppoe_seq_show,
1084};
1085
1086static int pppoe_seq_open(struct inode *inode, struct file *file)
1087{
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001088 return seq_open_net(inode, file, &pppoe_seq_ops,
1089 sizeof(struct seq_net_private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090}
1091
Arjan van de Vend54b1fd2007-02-12 00:55:34 -08001092static const struct file_operations pppoe_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 .owner = THIS_MODULE,
1094 .open = pppoe_seq_open,
1095 .read = seq_read,
1096 .llseek = seq_lseek,
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001097 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098};
1099
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100#endif /* CONFIG_PROC_FS */
1101
David S. Miller17ba15f2005-12-27 20:57:40 -08001102static const struct proto_ops pppoe_ops = {
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001103 .family = AF_PPPOX,
1104 .owner = THIS_MODULE,
1105 .release = pppoe_release,
1106 .bind = sock_no_bind,
1107 .connect = pppoe_connect,
1108 .socketpair = sock_no_socketpair,
1109 .accept = sock_no_accept,
1110 .getname = pppoe_getname,
1111 .poll = datagram_poll,
1112 .listen = sock_no_listen,
1113 .shutdown = sock_no_shutdown,
1114 .setsockopt = sock_no_setsockopt,
1115 .getsockopt = sock_no_getsockopt,
1116 .sendmsg = pppoe_sendmsg,
1117 .recvmsg = pppoe_recvmsg,
1118 .mmap = sock_no_mmap,
1119 .ioctl = pppox_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120};
1121
Eric Dumazet756e64a2010-09-21 06:43:54 +00001122static const struct pppox_proto pppoe_proto = {
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001123 .create = pppoe_create,
1124 .ioctl = pppoe_ioctl,
1125 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126};
1127
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001128static __net_init int pppoe_init_net(struct net *net)
1129{
Eric W. Biedermanc879a6f2009-11-29 15:46:10 +00001130 struct pppoe_net *pn = pppoe_pernet(net);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001131 struct proc_dir_entry *pde;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001132
1133 rwlock_init(&pn->hash_lock);
1134
Gao fengd4beaa62013-02-18 01:34:54 +00001135 pde = proc_create("pppoe", S_IRUGO, net->proc_net, &pppoe_seq_fops);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001136#ifdef CONFIG_PROC_FS
Eric W. Biedermanc879a6f2009-11-29 15:46:10 +00001137 if (!pde)
1138 return -ENOMEM;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001139#endif
1140
1141 return 0;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001142}
1143
1144static __net_exit void pppoe_exit_net(struct net *net)
1145{
Gao fengece31ff2013-02-18 01:34:56 +00001146 remove_proc_entry("pppoe", net->proc_net);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001147}
1148
Alexey Dobriyan00129852009-02-09 18:05:16 -08001149static struct pernet_operations pppoe_net_ops = {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001150 .init = pppoe_init_net,
1151 .exit = pppoe_exit_net,
Eric W. Biedermanc879a6f2009-11-29 15:46:10 +00001152 .id = &pppoe_net_id,
1153 .size = sizeof(struct pppoe_net),
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001154};
1155
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156static int __init pppoe_init(void)
1157{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001158 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159
Eric W. Biedermanc879a6f2009-11-29 15:46:10 +00001160 err = register_pernet_device(&pppoe_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 if (err)
1162 goto out;
1163
Cyrill Gorcunov07f66422009-08-12 16:39:16 -07001164 err = proto_register(&pppoe_sk_proto, 0);
1165 if (err)
1166 goto out_unregister_net_ops;
1167
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001168 err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 if (err)
1170 goto out_unregister_pppoe_proto;
1171
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 dev_add_pack(&pppoes_ptype);
1173 dev_add_pack(&pppoed_ptype);
1174 register_netdevice_notifier(&pppoe_notifier);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001175
1176 return 0;
1177
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178out_unregister_pppoe_proto:
1179 proto_unregister(&pppoe_sk_proto);
Cyrill Gorcunov07f66422009-08-12 16:39:16 -07001180out_unregister_net_ops:
Eric W. Biedermanc879a6f2009-11-29 15:46:10 +00001181 unregister_pernet_device(&pppoe_net_ops);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001182out:
1183 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184}
1185
1186static void __exit pppoe_exit(void)
1187{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 unregister_netdevice_notifier(&pppoe_notifier);
Cyrill Gorcunov07f66422009-08-12 16:39:16 -07001189 dev_remove_pack(&pppoed_ptype);
1190 dev_remove_pack(&pppoes_ptype);
1191 unregister_pppox_proto(PX_PROTO_OE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 proto_unregister(&pppoe_sk_proto);
Eric W. Biedermanc879a6f2009-11-29 15:46:10 +00001193 unregister_pernet_device(&pppoe_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194}
1195
1196module_init(pppoe_init);
1197module_exit(pppoe_exit);
1198
1199MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
1200MODULE_DESCRIPTION("PPP over Ethernet driver");
1201MODULE_LICENSE("GPL");
1202MODULE_ALIAS_NETPROTO(PF_PPPOX);