OMAP3: PM: default defconfig for PM kernel testing
[linux-ginger.git] / drivers / net / pppoe.c
blob7cbf6f9b51deddb790372a652e169ca0ccf0ef77
1 /** -*- linux-c -*- ***********************************************************
2 * Linux PPP over Ethernet (PPPoX/PPPoE) Sockets
4 * PPPoX --- Generic PPP encapsulation socket family
5 * PPPoE --- PPP over Ethernet (RFC 2516)
8 * Version: 0.7.0
10 * 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 ...)
16 * 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)
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.
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>
81 #include <linux/nsproxy.h>
82 #include <net/net_namespace.h>
83 #include <net/netns/generic.h>
84 #include <net/sock.h>
86 #include <asm/uaccess.h>
88 #define PPPOE_HASH_BITS 4
89 #define PPPOE_HASH_SIZE (1 << PPPOE_HASH_BITS)
90 #define PPPOE_HASH_MASK (PPPOE_HASH_SIZE - 1)
92 static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
93 static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb);
94 static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb);
96 static const struct proto_ops pppoe_ops;
97 static struct ppp_channel_ops pppoe_chan_ops;
99 /* per-net private data for this module */
100 static int pppoe_net_id;
101 struct pppoe_net {
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
110 struct pppox_sock *hash_table[PPPOE_HASH_SIZE];
111 rwlock_t hash_lock;
114 /* to eliminate a race btw pppoe_flush_dev and pppoe_release */
115 static DEFINE_SPINLOCK(flush_lock);
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)
122 * Ethernet frames have a special tag for this but
123 * we use simplier approach based on session id
125 static inline bool stage_session(__be16 sid)
127 return sid != 0;
130 static inline struct pppoe_net *pppoe_pernet(struct net *net)
132 BUG_ON(!net);
134 return net_generic(net, pppoe_net_id);
137 static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b)
139 return a->sid == b->sid && !memcmp(a->remote, b->remote, ETH_ALEN);
142 static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr)
144 return a->sid == sid && !memcmp(a->remote, addr, ETH_ALEN);
147 #if 8 % PPPOE_HASH_BITS
148 #error 8 must be a multiple of PPPOE_HASH_BITS
149 #endif
151 static int hash_item(__be16 sid, unsigned char *addr)
153 unsigned char hash = 0;
154 unsigned int i;
156 for (i = 0; i < ETH_ALEN; i++)
157 hash ^= addr[i];
158 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;
163 return hash & PPPOE_HASH_MASK;
166 /**********************************************************************
168 * Set/get/delete/rehash items (internal versions)
170 **********************************************************************/
171 static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid,
172 unsigned char *addr, int ifindex)
174 int hash = hash_item(sid, addr);
175 struct pppox_sock *ret;
177 ret = pn->hash_table[hash];
178 while (ret) {
179 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
180 ret->pppoe_ifindex == ifindex)
181 return ret;
183 ret = ret->next;
186 return NULL;
189 static int __set_item(struct pppoe_net *pn, struct pppox_sock *po)
191 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
192 struct pppox_sock *ret;
194 ret = pn->hash_table[hash];
195 while (ret) {
196 if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) &&
197 ret->pppoe_ifindex == po->pppoe_ifindex)
198 return -EALREADY;
200 ret = ret->next;
203 po->next = pn->hash_table[hash];
204 pn->hash_table[hash] = po;
206 return 0;
209 static struct pppox_sock *__delete_item(struct pppoe_net *pn, __be16 sid,
210 char *addr, int ifindex)
212 int hash = hash_item(sid, addr);
213 struct pppox_sock *ret, **src;
215 ret = pn->hash_table[hash];
216 src = &pn->hash_table[hash];
218 while (ret) {
219 if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
220 ret->pppoe_ifindex == ifindex) {
221 *src = ret->next;
222 break;
225 src = &ret->next;
226 ret = ret->next;
229 return ret;
232 /**********************************************************************
234 * Set/get/delete/rehash items
236 **********************************************************************/
237 static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid,
238 unsigned char *addr, int ifindex)
240 struct pppox_sock *po;
242 read_lock_bh(&pn->hash_lock);
243 po = __get_item(pn, sid, addr, ifindex);
244 if (po)
245 sock_hold(sk_pppox(po));
246 read_unlock_bh(&pn->hash_lock);
248 return po;
251 static inline struct pppox_sock *get_item_by_addr(struct net *net,
252 struct sockaddr_pppox *sp)
254 struct net_device *dev;
255 struct pppoe_net *pn;
256 struct pppox_sock *pppox_sock;
258 int ifindex;
260 dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
261 if (!dev)
262 return NULL;
264 ifindex = dev->ifindex;
265 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);
268 dev_put(dev);
270 return pppox_sock;
273 static inline struct pppox_sock *delete_item(struct pppoe_net *pn, __be16 sid,
274 char *addr, int ifindex)
276 struct pppox_sock *ret;
278 write_lock_bh(&pn->hash_lock);
279 ret = __delete_item(pn, sid, addr, ifindex);
280 write_unlock_bh(&pn->hash_lock);
282 return ret;
285 /***************************************************************************
287 * Handler for device events.
288 * Certain device events require that sockets be unconnected.
290 **************************************************************************/
292 static void pppoe_flush_dev(struct net_device *dev)
294 struct pppoe_net *pn;
295 int i;
297 BUG_ON(dev == NULL);
299 pn = pppoe_pernet(dev_net(dev));
300 if (!pn) /* already freed */
301 return;
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];
307 while (po != NULL) {
308 struct sock *sk;
309 if (po->pppoe_dev != dev) {
310 po = po->next;
311 continue;
313 sk = sk_pppox(po);
314 spin_lock(&flush_lock);
315 po->pppoe_dev = NULL;
316 spin_unlock(&flush_lock);
317 dev_put(dev);
319 /* We always grab the socket lock, followed by the
320 * hash_lock, in that order. Since we should
321 * 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.
327 sock_hold(sk);
329 write_unlock_bh(&pn->hash_lock);
330 lock_sock(sk);
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);
338 release_sock(sk);
339 sock_put(sk);
341 /* Restart scan at the beginning of this hash chain.
342 * While the lock was dropped the chain contents may
343 * have changed.
345 write_lock_bh(&pn->hash_lock);
346 po = pn->hash_table[i];
349 write_unlock_bh(&pn->hash_lock);
352 static int pppoe_device_event(struct notifier_block *this,
353 unsigned long event, void *ptr)
355 struct net_device *dev = (struct net_device *)ptr;
357 /* 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.
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;
370 default:
371 break;
374 return NOTIFY_DONE;
377 static struct notifier_block pppoe_notifier = {
378 .notifier_call = pppoe_device_event,
381 /************************************************************************
383 * Do the real work of receiving a PPPoE Session frame.
385 ***********************************************************************/
386 static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb)
388 struct pppox_sock *po = pppox_sk(sk);
389 struct pppox_sock *relay_po;
391 if (sk->sk_state & PPPOX_BOUND) {
392 ppp_input(&po->chan, skb);
393 } else if (sk->sk_state & PPPOX_RELAY) {
394 relay_po = get_item_by_addr(dev_net(po->pppoe_dev),
395 &po->pppoe_relay);
396 if (relay_po == NULL)
397 goto abort_kfree;
399 if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0)
400 goto abort_put;
402 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;
409 return NET_RX_SUCCESS;
411 abort_put:
412 sock_put(sk_pppox(relay_po));
414 abort_kfree:
415 kfree_skb(skb);
416 return NET_RX_DROP;
419 /************************************************************************
421 * Receive wrapper called in BH context.
423 ***********************************************************************/
424 static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev,
425 struct packet_type *pt, struct net_device *orig_dev)
427 struct pppoe_hdr *ph;
428 struct pppox_sock *po;
429 struct pppoe_net *pn;
430 int len;
432 skb = skb_share_check(skb, GFP_ATOMIC);
433 if (!skb)
434 goto out;
436 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
437 goto drop;
439 ph = pppoe_hdr(skb);
440 len = ntohs(ph->length);
442 skb_pull_rcsum(skb, sizeof(*ph));
443 if (skb->len < len)
444 goto drop;
446 if (pskb_trim_rcsum(skb, len))
447 goto drop;
449 pn = pppoe_pernet(dev_net(dev));
450 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
451 if (!po)
452 goto drop;
454 return sk_receive_skb(sk_pppox(po), skb, 0);
456 drop:
457 kfree_skb(skb);
458 out:
459 return NET_RX_DROP;
462 /************************************************************************
464 * Receive a PPPoE Discovery frame.
465 * This is solely for detection of PADT frames
467 ***********************************************************************/
468 static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev,
469 struct packet_type *pt, struct net_device *orig_dev)
472 struct pppoe_hdr *ph;
473 struct pppox_sock *po;
474 struct pppoe_net *pn;
476 skb = skb_share_check(skb, GFP_ATOMIC);
477 if (!skb)
478 goto out;
480 if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
481 goto abort;
483 ph = pppoe_hdr(skb);
484 if (ph->code != PADT_CODE)
485 goto abort;
487 pn = pppoe_pernet(dev_net(dev));
488 po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
489 if (po) {
490 struct sock *sk = sk_pppox(po);
492 bh_lock_sock(sk);
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.
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.
503 sk->sk_state = PPPOX_ZOMBIE;
506 bh_unlock_sock(sk);
507 sock_put(sk);
510 abort:
511 kfree_skb(skb);
512 out:
513 return NET_RX_SUCCESS; /* Lies... :-) */
516 static struct packet_type pppoes_ptype __read_mostly = {
517 .type = cpu_to_be16(ETH_P_PPP_SES),
518 .func = pppoe_rcv,
521 static struct packet_type pppoed_ptype __read_mostly = {
522 .type = cpu_to_be16(ETH_P_PPP_DISC),
523 .func = pppoe_disc_rcv,
526 static struct proto pppoe_sk_proto __read_mostly = {
527 .name = "PPPOE",
528 .owner = THIS_MODULE,
529 .obj_size = sizeof(struct pppox_sock),
532 /***********************************************************************
534 * Initialize a new struct sock.
536 **********************************************************************/
537 static int pppoe_create(struct net *net, struct socket *sock)
539 struct sock *sk;
541 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto);
542 if (!sk)
543 return -ENOMEM;
545 sock_init_data(sock, sk);
547 sock->state = SS_UNCONNECTED;
548 sock->ops = &pppoe_ops;
550 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;
556 return 0;
559 static int pppoe_release(struct socket *sock)
561 struct sock *sk = sock->sk;
562 struct pppox_sock *po;
563 struct pppoe_net *pn;
565 if (!sk)
566 return 0;
568 lock_sock(sk);
569 if (sock_flag(sk, SOCK_DEAD)) {
570 release_sock(sk);
571 return -EBADF;
574 pppox_unbind_sock(sk);
576 /* Signal the death of the socket. */
577 sk->sk_state = PPPOX_DEAD;
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)
584 spin_lock(&flush_lock);
585 po = pppox_sk(sk);
586 if (!po->pppoe_dev) {
587 spin_unlock(&flush_lock);
588 goto out;
590 pn = pppoe_pernet(dev_net(po->pppoe_dev));
591 spin_unlock(&flush_lock);
594 * protect "po" from concurrent updates
595 * on pppoe_flush_dev
597 write_lock_bh(&pn->hash_lock);
599 po = pppox_sk(sk);
600 if (stage_session(po->pppoe_pa.sid))
601 __delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote,
602 po->pppoe_ifindex);
604 if (po->pppoe_dev) {
605 dev_put(po->pppoe_dev);
606 po->pppoe_dev = NULL;
609 write_unlock_bh(&pn->hash_lock);
611 out:
612 sock_orphan(sk);
613 sock->sk = NULL;
615 skb_queue_purge(&sk->sk_receive_queue);
616 release_sock(sk);
617 sock_put(sk);
619 return 0;
622 static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
623 int sockaddr_len, int flags)
625 struct sock *sk = sock->sk;
626 struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr;
627 struct pppox_sock *po = pppox_sk(sk);
628 struct net_device *dev;
629 struct pppoe_net *pn;
630 int error;
632 lock_sock(sk);
634 error = -EINVAL;
635 if (sp->sa_protocol != PX_PROTO_OE)
636 goto end;
638 /* Check for already bound sockets */
639 error = -EBUSY;
640 if ((sk->sk_state & PPPOX_CONNECTED) &&
641 stage_session(sp->sa_addr.pppoe.sid))
642 goto end;
644 /* Check for already disconnected sockets, on attempts to disconnect */
645 error = -EALREADY;
646 if ((sk->sk_state & PPPOX_DEAD) &&
647 !stage_session(sp->sa_addr.pppoe.sid))
648 goto end;
650 error = 0;
652 /* Delete the old binding */
653 if (stage_session(po->pppoe_pa.sid)) {
654 pppox_unbind_sock(sk);
655 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);
659 dev_put(po->pppoe_dev);
661 memset(sk_pppox(po) + 1, 0,
662 sizeof(struct pppox_sock) - sizeof(struct sock));
663 sk->sk_state = PPPOX_NONE;
666 /* Re-bind in session stage only */
667 if (stage_session(sp->sa_addr.pppoe.sid)) {
668 error = -ENODEV;
669 dev = dev_get_by_name(sock_net(sk), sp->sa_addr.pppoe.dev);
670 if (!dev)
671 goto end;
673 po->pppoe_dev = dev;
674 po->pppoe_ifindex = dev->ifindex;
675 pn = pppoe_pernet(dev_net(dev));
676 write_lock_bh(&pn->hash_lock);
677 if (!(dev->flags & IFF_UP)) {
678 write_unlock_bh(&pn->hash_lock);
679 goto err_put;
682 memcpy(&po->pppoe_pa,
683 &sp->sa_addr.pppoe,
684 sizeof(struct pppoe_addr));
686 error = __set_item(pn, po);
687 write_unlock_bh(&pn->hash_lock);
688 if (error < 0)
689 goto err_put;
691 po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
692 dev->hard_header_len);
694 po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr);
695 po->chan.private = sk;
696 po->chan.ops = &pppoe_chan_ops;
698 error = ppp_register_net_channel(dev_net(dev), &po->chan);
699 if (error)
700 goto err_put;
702 sk->sk_state = PPPOX_CONNECTED;
705 po->num = sp->sa_addr.pppoe.sid;
707 end:
708 release_sock(sk);
709 return error;
710 err_put:
711 if (po->pppoe_dev) {
712 dev_put(po->pppoe_dev);
713 po->pppoe_dev = NULL;
715 goto end;
718 static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
719 int *usockaddr_len, int peer)
721 int len = sizeof(struct sockaddr_pppox);
722 struct sockaddr_pppox sp;
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));
729 memcpy(uaddr, &sp, len);
731 *usockaddr_len = len;
733 return 0;
736 static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
737 unsigned long arg)
739 struct sock *sk = sock->sk;
740 struct pppox_sock *po = pppox_sk(sk);
741 int val;
742 int err;
744 switch (cmd) {
745 case PPPIOCGMRU:
746 err = -ENXIO;
747 if (!(sk->sk_state & PPPOX_CONNECTED))
748 break;
750 err = -EFAULT;
751 if (put_user(po->pppoe_dev->mtu -
752 sizeof(struct pppoe_hdr) -
753 PPP_HDRLEN,
754 (int __user *)arg))
755 break;
756 err = 0;
757 break;
759 case PPPIOCSMRU:
760 err = -ENXIO;
761 if (!(sk->sk_state & PPPOX_CONNECTED))
762 break;
764 err = -EFAULT;
765 if (get_user(val, (int __user *)arg))
766 break;
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;
776 case PPPIOCSFLAGS:
777 err = -EFAULT;
778 if (get_user(val, (int __user *)arg))
779 break;
780 err = 0;
781 break;
783 case PPPOEIOCSFWD:
785 struct pppox_sock *relay_po;
787 err = -EBUSY;
788 if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD))
789 break;
791 err = -ENOTCONN;
792 if (!(sk->sk_state & PPPOX_CONNECTED))
793 break;
795 /* PPPoE address from the user specifies an outbound
796 PPPoE address which frames are forwarded to */
797 err = -EFAULT;
798 if (copy_from_user(&po->pppoe_relay,
799 (void __user *)arg,
800 sizeof(struct sockaddr_pppox)))
801 break;
803 err = -EINVAL;
804 if (po->pppoe_relay.sa_family != AF_PPPOX ||
805 po->pppoe_relay.sa_protocol != PX_PROTO_OE)
806 break;
808 /* Check that the socket referenced by the address
809 actually exists. */
810 relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay);
811 if (!relay_po)
812 break;
814 sock_put(sk_pppox(relay_po));
815 sk->sk_state |= PPPOX_RELAY;
816 err = 0;
817 break;
820 case PPPOEIOCDFWD:
821 err = -EALREADY;
822 if (!(sk->sk_state & PPPOX_RELAY))
823 break;
825 sk->sk_state &= ~PPPOX_RELAY;
826 err = 0;
827 break;
829 default:
830 err = -ENOTTY;
833 return err;
836 static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
837 struct msghdr *m, size_t total_len)
839 struct sk_buff *skb;
840 struct sock *sk = sock->sk;
841 struct pppox_sock *po = pppox_sk(sk);
842 int error;
843 struct pppoe_hdr hdr;
844 struct pppoe_hdr *ph;
845 struct net_device *dev;
846 char *start;
848 lock_sock(sk);
849 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) {
850 error = -ENOTCONN;
851 goto end;
854 hdr.ver = 1;
855 hdr.type = 1;
856 hdr.code = 0;
857 hdr.sid = po->num;
859 dev = po->pppoe_dev;
861 error = -EMSGSIZE;
862 if (total_len > (dev->mtu + dev->hard_header_len))
863 goto end;
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;
873 /* Reserve space for headers. */
874 skb_reserve(skb, dev->hard_header_len);
875 skb_reset_network_header(skb);
877 skb->dev = dev;
879 skb->priority = sk->sk_priority;
880 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
882 ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr));
883 start = (char *)&ph->tag[0];
885 error = memcpy_fromiovec(start, m->msg_iov, total_len);
886 if (error < 0) {
887 kfree_skb(skb);
888 goto end;
891 error = total_len;
892 dev_hard_header(skb, dev, ETH_P_PPP_SES,
893 po->pppoe_pa.remote, NULL, total_len);
895 memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
897 ph->length = htons(total_len);
899 dev_queue_xmit(skb);
901 end:
902 release_sock(sk);
903 return error;
906 /************************************************************************
908 * xmit function for internal use.
910 ***********************************************************************/
911 static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
913 struct pppox_sock *po = pppox_sk(sk);
914 struct net_device *dev = po->pppoe_dev;
915 struct pppoe_hdr *ph;
916 int data_len = skb->len;
918 if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
919 goto abort;
921 if (!dev)
922 goto abort;
924 /* Copy the data if there is no space for the header or if it's
925 * read-only.
927 if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len))
928 goto abort;
930 __skb_push(skb, sizeof(*ph));
931 skb_reset_network_header(skb);
933 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);
940 skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
941 skb->dev = dev;
943 dev_hard_header(skb, dev, ETH_P_PPP_SES,
944 po->pppoe_pa.remote, NULL, data_len);
946 dev_queue_xmit(skb);
948 return 1;
950 abort:
951 kfree_skb(skb);
952 return 1;
955 /************************************************************************
957 * xmit function called by generic PPP driver
958 * sends PPP frame over PPPoE socket
960 ***********************************************************************/
961 static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
963 struct sock *sk = (struct sock *)chan->private;
964 return __pppoe_xmit(sk, skb);
967 static struct ppp_channel_ops pppoe_chan_ops = {
968 .start_xmit = pppoe_xmit,
971 static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock,
972 struct msghdr *m, size_t total_len, int flags)
974 struct sock *sk = sock->sk;
975 struct sk_buff *skb;
976 int error = 0;
978 if (sk->sk_state & PPPOX_BOUND) {
979 error = -EIO;
980 goto end;
983 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
984 flags & MSG_DONTWAIT, &error);
985 if (error < 0)
986 goto end;
988 m->msg_namelen = 0;
990 if (skb) {
991 total_len = min_t(size_t, total_len, skb->len);
992 error = skb_copy_datagram_iovec(skb, 0, m->msg_iov, total_len);
993 if (error == 0)
994 error = total_len;
997 kfree_skb(skb);
998 end:
999 return error;
1002 #ifdef CONFIG_PROC_FS
1003 static int pppoe_seq_show(struct seq_file *seq, void *v)
1005 struct pppox_sock *po;
1006 char *dev_name;
1008 if (v == SEQ_START_TOKEN) {
1009 seq_puts(seq, "Id Address Device\n");
1010 goto out;
1013 po = v;
1014 dev_name = po->pppoe_pa.dev;
1016 seq_printf(seq, "%08X %pM %8s\n",
1017 po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
1018 out:
1019 return 0;
1022 static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos)
1024 struct pppox_sock *po;
1025 int i;
1027 for (i = 0; i < PPPOE_HASH_SIZE; i++) {
1028 po = pn->hash_table[i];
1029 while (po) {
1030 if (!pos--)
1031 goto out;
1032 po = po->next;
1036 out:
1037 return po;
1040 static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
1041 __acquires(pn->hash_lock)
1043 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1044 loff_t l = *pos;
1046 read_lock_bh(&pn->hash_lock);
1047 return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN;
1050 static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1052 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1053 struct pppox_sock *po;
1055 ++*pos;
1056 if (v == SEQ_START_TOKEN) {
1057 po = pppoe_get_idx(pn, 0);
1058 goto out;
1060 po = v;
1061 if (po->next)
1062 po = po->next;
1063 else {
1064 int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
1066 po = NULL;
1067 while (++hash < PPPOE_HASH_SIZE) {
1068 po = pn->hash_table[hash];
1069 if (po)
1070 break;
1074 out:
1075 return po;
1078 static void pppoe_seq_stop(struct seq_file *seq, void *v)
1079 __releases(pn->hash_lock)
1081 struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
1082 read_unlock_bh(&pn->hash_lock);
1085 static const struct seq_operations pppoe_seq_ops = {
1086 .start = pppoe_seq_start,
1087 .next = pppoe_seq_next,
1088 .stop = pppoe_seq_stop,
1089 .show = pppoe_seq_show,
1092 static int pppoe_seq_open(struct inode *inode, struct file *file)
1094 return seq_open_net(inode, file, &pppoe_seq_ops,
1095 sizeof(struct seq_net_private));
1098 static const struct file_operations pppoe_seq_fops = {
1099 .owner = THIS_MODULE,
1100 .open = pppoe_seq_open,
1101 .read = seq_read,
1102 .llseek = seq_lseek,
1103 .release = seq_release_net,
1106 #endif /* CONFIG_PROC_FS */
1108 static const struct proto_ops pppoe_ops = {
1109 .family = AF_PPPOX,
1110 .owner = THIS_MODULE,
1111 .release = pppoe_release,
1112 .bind = sock_no_bind,
1113 .connect = pppoe_connect,
1114 .socketpair = sock_no_socketpair,
1115 .accept = sock_no_accept,
1116 .getname = pppoe_getname,
1117 .poll = datagram_poll,
1118 .listen = sock_no_listen,
1119 .shutdown = sock_no_shutdown,
1120 .setsockopt = sock_no_setsockopt,
1121 .getsockopt = sock_no_getsockopt,
1122 .sendmsg = pppoe_sendmsg,
1123 .recvmsg = pppoe_recvmsg,
1124 .mmap = sock_no_mmap,
1125 .ioctl = pppox_ioctl,
1128 static struct pppox_proto pppoe_proto = {
1129 .create = pppoe_create,
1130 .ioctl = pppoe_ioctl,
1131 .owner = THIS_MODULE,
1134 static __net_init int pppoe_init_net(struct net *net)
1136 struct pppoe_net *pn;
1137 struct proc_dir_entry *pde;
1138 int err;
1140 pn = kzalloc(sizeof(*pn), GFP_KERNEL);
1141 if (!pn)
1142 return -ENOMEM;
1144 rwlock_init(&pn->hash_lock);
1146 err = net_assign_generic(net, pppoe_net_id, pn);
1147 if (err)
1148 goto out;
1150 pde = proc_net_fops_create(net, "pppoe", S_IRUGO, &pppoe_seq_fops);
1151 #ifdef CONFIG_PROC_FS
1152 if (!pde) {
1153 err = -ENOMEM;
1154 goto out;
1156 #endif
1158 return 0;
1160 out:
1161 kfree(pn);
1162 return err;
1165 static __net_exit void pppoe_exit_net(struct net *net)
1167 struct pppoe_net *pn;
1169 proc_net_remove(net, "pppoe");
1170 pn = net_generic(net, pppoe_net_id);
1172 * if someone has cached our net then
1173 * further net_generic call will return NULL
1175 net_assign_generic(net, pppoe_net_id, NULL);
1176 kfree(pn);
1179 static struct pernet_operations pppoe_net_ops = {
1180 .init = pppoe_init_net,
1181 .exit = pppoe_exit_net,
1184 static int __init pppoe_init(void)
1186 int err;
1188 err = register_pernet_gen_device(&pppoe_net_id, &pppoe_net_ops);
1189 if (err)
1190 goto out;
1192 err = proto_register(&pppoe_sk_proto, 0);
1193 if (err)
1194 goto out_unregister_net_ops;
1196 err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
1197 if (err)
1198 goto out_unregister_pppoe_proto;
1200 dev_add_pack(&pppoes_ptype);
1201 dev_add_pack(&pppoed_ptype);
1202 register_netdevice_notifier(&pppoe_notifier);
1204 return 0;
1206 out_unregister_pppoe_proto:
1207 proto_unregister(&pppoe_sk_proto);
1208 out_unregister_net_ops:
1209 unregister_pernet_gen_device(pppoe_net_id, &pppoe_net_ops);
1210 out:
1211 return err;
1214 static void __exit pppoe_exit(void)
1216 unregister_netdevice_notifier(&pppoe_notifier);
1217 dev_remove_pack(&pppoed_ptype);
1218 dev_remove_pack(&pppoes_ptype);
1219 unregister_pppox_proto(PX_PROTO_OE);
1220 proto_unregister(&pppoe_sk_proto);
1221 unregister_pernet_gen_device(pppoe_net_id, &pppoe_net_ops);
1224 module_init(pppoe_init);
1225 module_exit(pppoe_exit);
1227 MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
1228 MODULE_DESCRIPTION("PPP over Ethernet driver");
1229 MODULE_LICENSE("GPL");
1230 MODULE_ALIAS_NETPROTO(PF_PPPOX);