blob: f0031f1f97e5e1b7bd52d825021fa3783c93885a [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
114/* to eliminate a race btw pppoe_flush_dev and pppoe_release */
115static DEFINE_SPINLOCK(flush_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800117/*
118 * PPPoE could be in the following stages:
119 * 1) Discovery stage (to obtain remote MAC and Session ID)
120 * 2) Session stage (MAC and SID are known)
121 *
122 * Ethernet frames have a special tag for this but
123 * we use simplier approach based on session id
124 */
125static inline bool stage_session(__be16 sid)
126{
127 return sid != 0;
128}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800130static inline struct pppoe_net *pppoe_pernet(struct net *net)
131{
132 BUG_ON(!net);
133
134 return net_generic(net, pppoe_net_id);
135}
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b)
138{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800139 return a->sid == b->sid && !memcmp(a->remote, b->remote, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
Al Virob963dc12007-08-23 02:55:33 -0400142static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800144 return a->sid == sid && !memcmp(a->remote, addr, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145}
146
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800147#if 8 % PPPOE_HASH_BITS
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700148#error 8 must be a multiple of PPPOE_HASH_BITS
149#endif
150
Al Virob963dc12007-08-23 02:55:33 -0400151static int hash_item(__be16 sid, unsigned char *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700153 unsigned char hash = 0;
154 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800156 for (i = 0; i < ETH_ALEN; i++)
Florian Zumbiehlf1543f82007-07-31 13:47:57 -0700157 hash ^= addr[i];
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800158 for (i = 0; i < sizeof(sid_t) * 8; i += 8)
159 hash ^= (__force __u32)sid >> i;
160 for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;)
161 hash ^= hash >> i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800163 return hash & PPPOE_HASH_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164}
165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166/**********************************************************************
167 *
168 * Set/get/delete/rehash items (internal versions)
169 *
170 **********************************************************************/
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800171static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid,
172 unsigned char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173{
174 int hash = hash_item(sid, addr);
175 struct pppox_sock *ret;
176
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800177 ret = pn->hash_table[hash];
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800178 while (ret) {
179 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
180 ret->pppoe_ifindex == ifindex)
181 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800183 ret = ret->next;
184 }
185
186 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187}
188
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800189static int __set_item(struct pppoe_net *pn, struct pppox_sock *po)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
191 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
192 struct pppox_sock *ret;
193
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800194 ret = pn->hash_table[hash];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 while (ret) {
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800196 if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) &&
197 ret->pppoe_ifindex == po->pppoe_ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 return -EALREADY;
199
200 ret = ret->next;
201 }
202
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800203 po->next = pn->hash_table[hash];
204 pn->hash_table[hash] = po;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206 return 0;
207}
208
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800209static struct pppox_sock *__delete_item(struct pppoe_net *pn, __be16 sid,
210 char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211{
212 int hash = hash_item(sid, addr);
213 struct pppox_sock *ret, **src;
214
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800215 ret = pn->hash_table[hash];
216 src = &pn->hash_table[hash];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218 while (ret) {
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800219 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
220 ret->pppoe_ifindex == ifindex) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 *src = ret->next;
222 break;
223 }
224
225 src = &ret->next;
226 ret = ret->next;
227 }
228
229 return ret;
230}
231
232/**********************************************************************
233 *
234 * Set/get/delete/rehash items
235 *
236 **********************************************************************/
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800237static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid,
238 unsigned char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239{
240 struct pppox_sock *po;
241
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800242 read_lock_bh(&pn->hash_lock);
243 po = __get_item(pn, sid, addr, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 if (po)
245 sock_hold(sk_pppox(po));
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800246 read_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
248 return po;
249}
250
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800251static inline struct pppox_sock *get_item_by_addr(struct net *net,
252 struct sockaddr_pppox *sp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253{
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700254 struct net_device *dev;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800255 struct pppoe_net *pn;
256 struct pppox_sock *pppox_sock;
257
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800258 int ifindex;
259
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800260 dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800261 if (!dev)
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800262 return NULL;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800263
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800264 ifindex = dev->ifindex;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800265 pn = net_generic(net, pppoe_net_id);
266 pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid,
267 sp->sa_addr.pppoe.remote, ifindex);
Florian Zumbiehl90719db2007-03-02 13:16:56 -0800268 dev_put(dev);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800269
270 return pppox_sock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271}
272
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800273static inline struct pppox_sock *delete_item(struct pppoe_net *pn, __be16 sid,
274 char *addr, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275{
276 struct pppox_sock *ret;
277
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800278 write_lock_bh(&pn->hash_lock);
279 ret = __delete_item(pn, sid, addr, ifindex);
280 write_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
282 return ret;
283}
284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285/***************************************************************************
286 *
287 * Handler for device events.
288 * Certain device events require that sockets be unconnected.
289 *
290 **************************************************************************/
291
292static void pppoe_flush_dev(struct net_device *dev)
293{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800294 struct pppoe_net *pn;
295 int i;
296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 BUG_ON(dev == NULL);
298
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800299 pn = pppoe_pernet(dev_net(dev));
300 if (!pn) /* already freed */
301 return;
302
303 write_lock_bh(&pn->hash_lock);
304 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
305 struct pppox_sock *po = pn->hash_table[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307 while (po != NULL) {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800308 struct sock *sk;
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700309 if (po->pppoe_dev != dev) {
310 po = po->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 continue;
312 }
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800313 sk = sk_pppox(po);
314 spin_lock(&flush_lock);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700315 po->pppoe_dev = NULL;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800316 spin_unlock(&flush_lock);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700317 dev_put(dev);
318
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700319 /* We always grab the socket lock, followed by the
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800320 * hash_lock, in that order. Since we should
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700321 * hold the sock lock while doing any unbinding,
322 * we need to release the lock we're holding.
323 * Hold a reference to the sock so it doesn't disappear
324 * as we're jumping between locks.
325 */
326
327 sock_hold(sk);
328
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800329 write_unlock_bh(&pn->hash_lock);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700330 lock_sock(sk);
331
332 if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
333 pppox_unbind_sock(sk);
334 sk->sk_state = PPPOX_ZOMBIE;
335 sk->sk_state_change(sk);
336 }
337
338 release_sock(sk);
339 sock_put(sk);
340
341 /* Restart scan at the beginning of this hash chain.
342 * While the lock was dropped the chain contents may
343 * have changed.
344 */
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
391 if (sk->sk_state & PPPOX_BOUND) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 ppp_input(&po->chan, skb);
393 } else if (sk->sk_state & PPPOX_RELAY) {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800394 relay_po = get_item_by_addr(dev_net(po->pppoe_dev),
395 &po->pppoe_relay);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 if (relay_po == NULL)
397 goto abort_kfree;
398
399 if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0)
400 goto abort_put;
401
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 if (!__pppoe_xmit(sk_pppox(relay_po), skb))
403 goto abort_put;
404 } else {
405 if (sock_queue_rcv_skb(sk, skb))
406 goto abort_kfree;
407 }
408
409 return NET_RX_SUCCESS;
410
411abort_put:
412 sock_put(sk_pppox(relay_po));
413
414abort_kfree:
415 kfree_skb(skb);
416 return NET_RX_DROP;
417}
418
419/************************************************************************
420 *
421 * Receive wrapper called in BH context.
422 *
423 ***********************************************************************/
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800424static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev,
425 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426{
427 struct pppoe_hdr *ph;
428 struct pppox_sock *po;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800429 struct pppoe_net *pn;
Herbert Xu392fdb02008-06-10 14:07:25 -0700430 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800432 skb = skb_share_check(skb, GFP_ATOMIC);
433 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 goto out;
435
Herbert Xu31bac442007-09-16 16:19:20 -0700436 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
437 goto drop;
438
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300439 ph = pppoe_hdr(skb);
Herbert Xu392fdb02008-06-10 14:07:25 -0700440 len = ntohs(ph->length);
441
442 skb_pull_rcsum(skb, sizeof(*ph));
443 if (skb->len < len)
444 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
David S. Miller263e69c2008-10-30 23:11:44 -0700446 if (pskb_trim_rcsum(skb, len))
Herbert Xu392fdb02008-06-10 14:07:25 -0700447 goto drop;
448
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800449 pn = pppoe_pernet(dev_net(dev));
450 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
David S. Miller263e69c2008-10-30 23:11:44 -0700451 if (!po)
Herbert Xu392fdb02008-06-10 14:07:25 -0700452 goto drop;
453
454 return sk_receive_skb(sk_pppox(po), skb, 0);
455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456drop:
457 kfree_skb(skb);
458out:
459 return NET_RX_DROP;
460}
461
462/************************************************************************
463 *
464 * Receive a PPPoE Discovery frame.
465 * This is solely for detection of PADT frames
466 *
467 ***********************************************************************/
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800468static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev,
469 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
471{
472 struct pppoe_hdr *ph;
473 struct pppox_sock *po;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800474 struct pppoe_net *pn;
Eric W. Biedermane730c152007-09-17 11:53:39 -0700475
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800476 skb = skb_share_check(skb, GFP_ATOMIC);
477 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 goto out;
479
Herbert Xubc6cffd12008-06-10 14:08:25 -0700480 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
481 goto abort;
482
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300483 ph = pppoe_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 if (ph->code != PADT_CODE)
485 goto abort;
486
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800487 pn = pppoe_pernet(dev_net(dev));
488 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 if (po) {
490 struct sock *sk = sk_pppox(po);
491
492 bh_lock_sock(sk);
493
494 /* If the user has locked the socket, just ignore
495 * the packet. With the way two rcv protocols hook into
496 * one socket family type, we cannot (easily) distinguish
497 * what kind of SKB it is during backlog rcv.
498 */
499 if (sock_owned_by_user(sk) == 0) {
500 /* We're no longer connect at the PPPOE layer,
501 * and must wait for ppp channel to disconnect us.
502 */
503 sk->sk_state = PPPOX_ZOMBIE;
504 }
505
506 bh_unlock_sock(sk);
507 sock_put(sk);
508 }
509
510abort:
511 kfree_skb(skb);
512out:
513 return NET_RX_SUCCESS; /* Lies... :-) */
514}
515
Stephen Hemminger7546dd92009-03-09 08:18:29 +0000516static struct packet_type pppoes_ptype __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -0800517 .type = cpu_to_be16(ETH_P_PPP_SES),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 .func = pppoe_rcv,
519};
520
Stephen Hemminger7546dd92009-03-09 08:18:29 +0000521static struct packet_type pppoed_ptype __read_mostly = {
Harvey Harrison09640e62009-02-01 00:45:17 -0800522 .type = cpu_to_be16(ETH_P_PPP_DISC),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 .func = pppoe_disc_rcv,
524};
525
Stephen Hemminger7546dd92009-03-09 08:18:29 +0000526static struct proto pppoe_sk_proto __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 .name = "PPPOE",
528 .owner = THIS_MODULE,
529 .obj_size = sizeof(struct pppox_sock),
530};
531
532/***********************************************************************
533 *
534 * Initialize a new struct sock.
535 *
536 **********************************************************************/
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700537static int pppoe_create(struct net *net, struct socket *sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 struct sock *sk;
540
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700541 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 if (!sk)
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800543 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
545 sock_init_data(sock, sk);
546
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800547 sock->state = SS_UNCONNECTED;
548 sock->ops = &pppoe_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800550 sk->sk_backlog_rcv = pppoe_rcv_core;
551 sk->sk_state = PPPOX_NONE;
552 sk->sk_type = SOCK_STREAM;
553 sk->sk_family = PF_PPPOX;
554 sk->sk_protocol = PX_PROTO_OE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800556 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557}
558
559static int pppoe_release(struct socket *sock)
560{
561 struct sock *sk = sock->sk;
562 struct pppox_sock *po;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800563 struct pppoe_net *pn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
565 if (!sk)
566 return 0;
567
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700568 lock_sock(sk);
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800569 if (sock_flag(sk, SOCK_DEAD)) {
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700570 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 return -EBADF;
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700572 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
574 pppox_unbind_sock(sk);
575
576 /* Signal the death of the socket. */
577 sk->sk_state = PPPOX_DEAD;
578
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800579 /*
580 * pppoe_flush_dev could lead to a race with
581 * this routine so we use flush_lock to eliminate
582 * such a case (we only need per-net specific data)
583 */
584 spin_lock(&flush_lock);
585 po = pppox_sk(sk);
586 if (!po->pppoe_dev) {
587 spin_unlock(&flush_lock);
588 goto out;
589 }
590 pn = pppoe_pernet(dev_net(po->pppoe_dev));
591 spin_unlock(&flush_lock);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700592
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800593 /*
594 * protect "po" from concurrent updates
595 * on pppoe_flush_dev
596 */
597 write_lock_bh(&pn->hash_lock);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700598
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 po = pppox_sk(sk);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800600 if (stage_session(po->pppoe_pa.sid))
601 __delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote,
602 po->pppoe_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700604 if (po->pppoe_dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 dev_put(po->pppoe_dev);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700606 po->pppoe_dev = NULL;
607 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800609 write_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800611out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 sock_orphan(sk);
613 sock->sk = NULL;
614
615 skb_queue_purge(&sk->sk_receive_queue);
Michal Ostrowski42dc9cd2007-04-20 16:59:24 -0700616 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 sock_put(sk);
618
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700619 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620}
621
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
623 int sockaddr_len, int flags)
624{
625 struct sock *sk = sock->sk;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800626 struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 struct pppox_sock *po = pppox_sk(sk);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800628 struct net_device *dev;
629 struct pppoe_net *pn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 int error;
631
632 lock_sock(sk);
633
634 error = -EINVAL;
635 if (sp->sa_protocol != PX_PROTO_OE)
636 goto end;
637
638 /* Check for already bound sockets */
639 error = -EBUSY;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800640 if ((sk->sk_state & PPPOX_CONNECTED) &&
641 stage_session(sp->sa_addr.pppoe.sid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 goto end;
643
644 /* Check for already disconnected sockets, on attempts to disconnect */
645 error = -EALREADY;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800646 if ((sk->sk_state & PPPOX_DEAD) &&
647 !stage_session(sp->sa_addr.pppoe.sid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 goto end;
649
650 error = 0;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800651
652 /* Delete the old binding */
653 if (stage_session(po->pppoe_pa.sid)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 pppox_unbind_sock(sk);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800655 if (po->pppoe_dev) {
656 pn = pppoe_pernet(dev_net(po->pppoe_dev));
657 delete_item(pn, po->pppoe_pa.sid,
658 po->pppoe_pa.remote, po->pppoe_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 dev_put(po->pppoe_dev);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800660 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 memset(sk_pppox(po) + 1, 0,
662 sizeof(struct pppox_sock) - sizeof(struct sock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 sk->sk_state = PPPOX_NONE;
664 }
665
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800666 /* Re-bind in session stage only */
667 if (stage_session(sp->sa_addr.pppoe.sid)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 error = -ENODEV;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800669 dev = dev_get_by_name(sock_net(sk), sp->sa_addr.pppoe.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 if (!dev)
671 goto end;
672
673 po->pppoe_dev = dev;
Florian Zumbiehl6f30e182007-03-04 16:03:22 -0800674 po->pppoe_ifindex = dev->ifindex;
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800675 pn = pppoe_pernet(dev_net(dev));
676 write_lock_bh(&pn->hash_lock);
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -0800677 if (!(dev->flags & IFF_UP)) {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800678 write_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 goto err_put;
Florian Zumbiehl74b885c2007-04-20 16:57:27 -0700680 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
682 memcpy(&po->pppoe_pa,
683 &sp->sa_addr.pppoe,
684 sizeof(struct pppoe_addr));
685
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800686 error = __set_item(pn, po);
687 write_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 if (error < 0)
689 goto err_put;
690
691 po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
692 dev->hard_header_len);
693
Michal Ostrowskic9aa6892006-09-27 16:11:25 -0700694 po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 po->chan.private = sk;
696 po->chan.ops = &pppoe_chan_ops;
697
Cyrill Gorcunovf5882c32009-01-21 15:55:40 -0800698 error = ppp_register_net_channel(dev_net(dev), &po->chan);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 if (error)
700 goto err_put;
701
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
918 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
919 goto abort;
920
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 if (!dev)
922 goto abort;
923
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700924 /* Copy the data if there is no space for the header or if it's
925 * read-only.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 */
Herbert Xud9cc2042007-09-16 16:21:16 -0700927 if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 goto abort;
929
Herbert Xu9355ec22007-09-16 16:20:21 -0700930 __skb_push(skb, sizeof(*ph));
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700931 skb_reset_network_header(skb);
932
Herbert Xu9355ec22007-09-16 16:20:21 -0700933 ph = pppoe_hdr(skb);
934 ph->ver = 1;
935 ph->type = 1;
936 ph->code = 0;
937 ph->sid = po->num;
938 ph->length = htons(data_len);
939
Harvey Harrison09640e62009-02-01 00:45:17 -0800940 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700941 skb->dev = dev;
942
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700943 dev_hard_header(skb, dev, ETH_P_PPP_SES,
944 po->pppoe_pa.remote, NULL, data_len);
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700945
Herbert Xu21d0c832007-09-19 10:45:02 -0700946 dev_queue_xmit(skb);
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700947
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 return 1;
949
950abort:
Herbert Xudb7bf6d2007-09-16 16:19:50 -0700951 kfree_skb(skb);
952 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953}
954
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955/************************************************************************
956 *
957 * xmit function called by generic PPP driver
958 * sends PPP frame over PPPoE socket
959 *
960 ***********************************************************************/
961static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
962{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -0800963 struct sock *sk = (struct sock *)chan->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 return __pppoe_xmit(sk, skb);
965}
966
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400967static struct ppp_channel_ops pppoe_chan_ops = {
968 .start_xmit = pppoe_xmit,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969};
970
971static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock,
972 struct msghdr *m, size_t total_len, int flags)
973{
974 struct sock *sk = sock->sk;
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700975 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977
978 if (sk->sk_state & PPPOX_BOUND) {
979 error = -EIO;
980 goto end;
981 }
982
983 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
984 flags & MSG_DONTWAIT, &error);
Florian Zumbiehlbfafb262007-04-20 16:56:31 -0700985 if (error < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987
988 m->msg_namelen = 0;
989
990 if (skb) {
Stephen Hemminger2645a3c2008-06-20 21:58:02 -0700991 total_len = min_t(size_t, total_len, skb->len);
Herbert Xu392fdb02008-06-10 14:07:25 -0700992 error = skb_copy_datagram_iovec(skb, 0, m->msg_iov, total_len);
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300993 if (error == 0)
Herbert Xu392fdb02008-06-10 14:07:25 -0700994 error = total_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 }
996
Arnaldo Carvalho de Melo797659f2007-03-10 15:56:08 -0300997 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998end:
999 return error;
1000}
1001
1002#ifdef CONFIG_PROC_FS
1003static int pppoe_seq_show(struct seq_file *seq, void *v)
1004{
1005 struct pppox_sock *po;
1006 char *dev_name;
1007
1008 if (v == SEQ_START_TOKEN) {
1009 seq_puts(seq, "Id Address Device\n");
1010 goto out;
1011 }
1012
1013 po = v;
1014 dev_name = po->pppoe_pa.dev;
1015
Johannes Berge1749612008-10-27 15:59:26 -07001016 seq_printf(seq, "%08X %pM %8s\n",
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001017 po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018out:
1019 return 0;
1020}
1021
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001022static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023{
Florian Zumbiehlbfafb262007-04-20 16:56:31 -07001024 struct pppox_sock *po;
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001025 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001027 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001028 po = pn->hash_table[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 while (po) {
1030 if (!pos--)
1031 goto out;
1032 po = po->next;
1033 }
1034 }
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001035
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036out:
1037 return po;
1038}
1039
1040static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001041 __acquires(pn->hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042{
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001043 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 loff_t l = *pos;
1045
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001046 read_lock_bh(&pn->hash_lock);
1047 return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048}
1049
1050static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1051{
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001052 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 struct pppox_sock *po;
1054
1055 ++*pos;
1056 if (v == SEQ_START_TOKEN) {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001057 po = pppoe_get_idx(pn, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 goto out;
1059 }
1060 po = v;
Jeff Garzik6aa20a22006-09-13 13:24:59 -04001061 if (po->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 po = po->next;
1063 else {
1064 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
1065
1066 while (++hash < PPPOE_HASH_SIZE) {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001067 po = pn->hash_table[hash];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 if (po)
1069 break;
1070 }
1071 }
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001072
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073out:
1074 return po;
1075}
1076
1077static void pppoe_seq_stop(struct seq_file *seq, void *v)
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001078 __releases(pn->hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079{
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001080 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001081 read_unlock_bh(&pn->hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082}
1083
Jan Engelhardt4101dec2009-01-14 13:52:18 -08001084static const struct seq_operations pppoe_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 .start = pppoe_seq_start,
1086 .next = pppoe_seq_next,
1087 .stop = pppoe_seq_stop,
1088 .show = pppoe_seq_show,
1089};
1090
1091static int pppoe_seq_open(struct inode *inode, struct file *file)
1092{
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001093 return seq_open_net(inode, file, &pppoe_seq_ops,
1094 sizeof(struct seq_net_private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095}
1096
Arjan van de Vend54b1fd2007-02-12 00:55:34 -08001097static const struct file_operations pppoe_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 .owner = THIS_MODULE,
1099 .open = pppoe_seq_open,
1100 .read = seq_read,
1101 .llseek = seq_lseek,
Cyrill Gorcunov3617aa42009-01-26 21:11:02 -08001102 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103};
1104
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105#endif /* CONFIG_PROC_FS */
1106
David S. Miller17ba15f2005-12-27 20:57:40 -08001107static const struct proto_ops pppoe_ops = {
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001108 .family = AF_PPPOX,
1109 .owner = THIS_MODULE,
1110 .release = pppoe_release,
1111 .bind = sock_no_bind,
1112 .connect = pppoe_connect,
1113 .socketpair = sock_no_socketpair,
1114 .accept = sock_no_accept,
1115 .getname = pppoe_getname,
1116 .poll = datagram_poll,
1117 .listen = sock_no_listen,
1118 .shutdown = sock_no_shutdown,
1119 .setsockopt = sock_no_setsockopt,
1120 .getsockopt = sock_no_getsockopt,
1121 .sendmsg = pppoe_sendmsg,
1122 .recvmsg = pppoe_recvmsg,
1123 .mmap = sock_no_mmap,
1124 .ioctl = pppox_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125};
1126
1127static struct pppox_proto pppoe_proto = {
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001128 .create = pppoe_create,
1129 .ioctl = pppoe_ioctl,
1130 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131};
1132
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001133static __net_init int pppoe_init_net(struct net *net)
1134{
1135 struct pppoe_net *pn;
1136 struct proc_dir_entry *pde;
1137 int err;
1138
1139 pn = kzalloc(sizeof(*pn), GFP_KERNEL);
1140 if (!pn)
1141 return -ENOMEM;
1142
1143 rwlock_init(&pn->hash_lock);
1144
1145 err = net_assign_generic(net, pppoe_net_id, pn);
1146 if (err)
1147 goto out;
1148
1149 pde = proc_net_fops_create(net, "pppoe", S_IRUGO, &pppoe_seq_fops);
1150#ifdef CONFIG_PROC_FS
1151 if (!pde) {
1152 err = -ENOMEM;
1153 goto out;
1154 }
1155#endif
1156
1157 return 0;
1158
1159out:
1160 kfree(pn);
1161 return err;
1162}
1163
1164static __net_exit void pppoe_exit_net(struct net *net)
1165{
1166 struct pppoe_net *pn;
1167
1168 proc_net_remove(net, "pppoe");
1169 pn = net_generic(net, pppoe_net_id);
1170 /*
1171 * if someone has cached our net then
1172 * further net_generic call will return NULL
1173 */
1174 net_assign_generic(net, pppoe_net_id, NULL);
1175 kfree(pn);
1176}
1177
Alexey Dobriyan00129852009-02-09 18:05:16 -08001178static struct pernet_operations pppoe_net_ops = {
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001179 .init = pppoe_init_net,
1180 .exit = pppoe_exit_net,
1181};
1182
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183static int __init pppoe_init(void)
1184{
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001185 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001187 err = proto_register(&pppoe_sk_proto, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 if (err)
1189 goto out;
1190
Cyrill Gorcunov6aba9152009-01-21 15:54:15 -08001191 err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 if (err)
1193 goto out_unregister_pppoe_proto;
1194
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001195 err = register_pernet_gen_device(&pppoe_net_id, &pppoe_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 if (err)
1197 goto out_unregister_pppox_proto;
Jeff Garzik6aa20a22006-09-13 13:24:59 -04001198
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 dev_add_pack(&pppoes_ptype);
1200 dev_add_pack(&pppoed_ptype);
1201 register_netdevice_notifier(&pppoe_notifier);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001202
1203 return 0;
1204
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205out_unregister_pppox_proto:
1206 unregister_pppox_proto(PX_PROTO_OE);
1207out_unregister_pppoe_proto:
1208 proto_unregister(&pppoe_sk_proto);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001209out:
1210 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211}
1212
1213static void __exit pppoe_exit(void)
1214{
1215 unregister_pppox_proto(PX_PROTO_OE);
1216 dev_remove_pack(&pppoes_ptype);
1217 dev_remove_pack(&pppoed_ptype);
1218 unregister_netdevice_notifier(&pppoe_notifier);
Cyrill Gorcunova6bcf1c2009-01-21 15:54:54 -08001219 unregister_pernet_gen_device(pppoe_net_id, &pppoe_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 proto_unregister(&pppoe_sk_proto);
1221}
1222
1223module_init(pppoe_init);
1224module_exit(pppoe_exit);
1225
1226MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
1227MODULE_DESCRIPTION("PPP over Ethernet driver");
1228MODULE_LICENSE("GPL");
1229MODULE_ALIAS_NETPROTO(PF_PPPOX);