aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/net/pppoe.c
blob: 475dc930380f63b6a1b0fd52b2532b43354798c5 (plain) (tree)
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053






















































































                                                                                 
                                        


























































































































































































































































                                                                               
                                                              





































                                                                          

                                                 



                              









                                                                       

                                                         













                                                                         

                                                      
































































































































































































































































































































































































































































































































































































































































                                                                                       
                                                          









                                                     
                                           














                                             

                                       









































                                                              
                                             









                                                           
/** -*- linux-c -*- ***********************************************************
 * Linux PPP over Ethernet (PPPoX/PPPoE) Sockets
 *
 * PPPoX --- Generic PPP encapsulation socket family
 * PPPoE --- PPP over Ethernet (RFC 2516)
 *
 *
 * Version:	0.7.0
 *
 * 220102 :	Fix module use count on failure in pppoe_create, pppox_sk -acme
 * 030700 :	Fixed connect logic to allow for disconnect.
 * 270700 :	Fixed potential SMP problems; we must protect against
 *		simultaneous invocation of ppp_input
 *		and ppp_unregister_channel.
 * 040800 :	Respect reference count mechanisms on net-devices.
 * 200800 :	fix kfree(skb) in pppoe_rcv (acme)
 *		Module reference count is decremented in the right spot now,
 *		guards against sock_put not actually freeing the sk
 *		in pppoe_release.
 * 051000 :	Initialization cleanup.
 * 111100 :	Fix recvmsg.
 * 050101 :	Fix PADT procesing.
 * 140501 :	Use pppoe_rcv_core to handle all backlog. (Alexey)
 * 170701 :	Do not lock_sock with rwlock held. (DaveM)
 *		Ignore discovery frames if user has socket
 *		locked. (DaveM)
 *		Ignore return value of dev_queue_xmit in __pppoe_xmit
 *		or else we may kfree an SKB twice. (DaveM)
 * 190701 :	When doing copies of skb's in __pppoe_xmit, always delete
 *		the original skb that was passed in on success, never on
 *		failure.  Delete the copy of the skb on failure to avoid
 *		a memory leak.
 * 081001 :	Misc. cleanup (licence string, non-blocking, prevent
 *		reference of device on close).
 * 121301 :	New ppp channels interface; cannot unregister a channel
 *		from interrupts.  Thus, we mark the socket as a ZOMBIE
 *		and do the unregistration later.
 * 081002 :	seq_file support for proc stuff -acme
 * 111602 :	Merge all 2.4 fixes into 2.5/2.6 tree.  Label 2.5/2.6
 *		as version 0.7.  Spacing cleanup.
 * Author:	Michal Ostrowski <mostrows@speakeasy.net>
 * Contributors:
 * 		Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *		David S. Miller (davem@redhat.com)
 *
 * License:
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 */

#include <linux/string.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/net.h>
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/if_ether.h>
#include <linux/if_pppox.h>
#include <linux/ppp_channel.h>
#include <linux/ppp_defs.h>
#include <linux/if_ppp.h>
#include <linux/notifier.h>
#include <linux/file.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>

#include <net/sock.h>

#include <asm/uaccess.h>

#define PPPOE_HASH_BITS 4
#define PPPOE_HASH_SIZE (1<<PPPOE_HASH_BITS)

static struct ppp_channel_ops pppoe_chan_ops;

static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb);
static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb);

static const struct proto_ops pppoe_ops;
static DEFINE_RWLOCK(pppoe_hash_lock);

static struct ppp_channel_ops pppoe_chan_ops;

static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b)
{
	return (a->sid == b->sid &&
		(memcmp(a->remote, b->remote, ETH_ALEN) == 0));
}

static inline int cmp_addr(struct pppoe_addr *a, unsigned long sid, char *addr)
{
	return (a->sid == sid &&
		(memcmp(a->remote,addr,ETH_ALEN) == 0));
}

static int hash_item(unsigned long sid, unsigned char *addr)
{
	char hash = 0;
	int i, j;

	for (i = 0; i < ETH_ALEN ; ++i) {
		for (j = 0; j < 8/PPPOE_HASH_BITS ; ++j) {
			hash ^= addr[i] >> ( j * PPPOE_HASH_BITS );
		}
	}

	for (i = 0; i < (sizeof(unsigned long)*8) / PPPOE_HASH_BITS ; ++i)
		hash ^= sid >> (i*PPPOE_HASH_BITS);

	return hash & ( PPPOE_HASH_SIZE - 1 );
}

/* zeroed because its in .bss */
static struct pppox_sock *item_hash_table[PPPOE_HASH_SIZE];

/**********************************************************************
 *
 *  Set/get/delete/rehash items  (internal versions)
 *
 **********************************************************************/
static struct pppox_sock *__get_item(unsigned long sid, unsigned char *addr)
{
	int hash = hash_item(sid, addr);
	struct pppox_sock *ret;

	ret = item_hash_table[hash];

	while (ret && !cmp_addr(&ret->pppoe_pa, sid, addr))
		ret = ret->next;

	return ret;
}

static int __set_item(struct pppox_sock *po)
{
	int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
	struct pppox_sock *ret;

	ret = item_hash_table[hash];
	while (ret) {
		if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa))
			return -EALREADY;

		ret = ret->next;
	}

	if (!ret) {
		po->next = item_hash_table[hash];
		item_hash_table[hash] = po;
	}

	return 0;
}

static struct pppox_sock *__delete_item(unsigned long sid, char *addr)
{
	int hash = hash_item(sid, addr);
	struct pppox_sock *ret, **src;

	ret = item_hash_table[hash];
	src = &item_hash_table[hash];

	while (ret) {
		if (cmp_addr(&ret->pppoe_pa, sid, addr)) {
			*src = ret->next;
			break;
		}

		src = &ret->next;
		ret = ret->next;
	}

	return ret;
}

/**********************************************************************
 *
 *  Set/get/delete/rehash items
 *
 **********************************************************************/
static inline struct pppox_sock *get_item(unsigned long sid,
					 unsigned char *addr)
{
	struct pppox_sock *po;

	read_lock_bh(&pppoe_hash_lock);
	po = __get_item(sid, addr);
	if (po)
		sock_hold(sk_pppox(po));
	read_unlock_bh(&pppoe_hash_lock);

	return po;
}

static inline struct pppox_sock *get_item_by_addr(struct sockaddr_pppox *sp)
{
	return get_item(sp->sa_addr.pppoe.sid, sp->sa_addr.pppoe.remote);
}

static inline int set_item(struct pppox_sock *po)
{
	int i;

	if (!po)
		return -EINVAL;

	write_lock_bh(&pppoe_hash_lock);
	i = __set_item(po);
	write_unlock_bh(&pppoe_hash_lock);

	return i;
}

static inline struct pppox_sock *delete_item(unsigned long sid, char *addr)
{
	struct pppox_sock *ret;

	write_lock_bh(&pppoe_hash_lock);
	ret = __delete_item(sid, addr);
	write_unlock_bh(&pppoe_hash_lock);

	return ret;
}



/***************************************************************************
 *
 *  Handler for device events.
 *  Certain device events require that sockets be unconnected.
 *
 **************************************************************************/

static void pppoe_flush_dev(struct net_device *dev)
{
	int hash;

	BUG_ON(dev == NULL);

	read_lock_bh(&pppoe_hash_lock);
	for (hash = 0; hash < PPPOE_HASH_SIZE; hash++) {
		struct pppox_sock *po = item_hash_table[hash];

		while (po != NULL) {
			if (po->pppoe_dev == dev) {
				struct sock *sk = sk_pppox(po);

				sock_hold(sk);
				po->pppoe_dev = NULL;

				/* We hold a reference to SK, now drop the
				 * hash table lock so that we may attempt
				 * to lock the socket (which can sleep).
				 */
				read_unlock_bh(&pppoe_hash_lock);

				lock_sock(sk);

				if (sk->sk_state &
				    (PPPOX_CONNECTED | PPPOX_BOUND)) {
					pppox_unbind_sock(sk);
					dev_put(dev);
					sk->sk_state = PPPOX_ZOMBIE;
					sk->sk_state_change(sk);
				}

				release_sock(sk);

				sock_put(sk);

				read_lock_bh(&pppoe_hash_lock);

				/* Now restart from the beginning of this
				 * hash chain.  We always NULL out pppoe_dev
				 * so we are guaranteed to make forward
				 * progress.
				 */
				po = item_hash_table[hash];
				continue;
			}
			po = po->next;
		}
	}
	read_unlock_bh(&pppoe_hash_lock);
}

static int pppoe_device_event(struct notifier_block *this,
			      unsigned long event, void *ptr)
{
	struct net_device *dev = (struct net_device *) ptr;

	/* Only look at sockets that are using this specific device. */
	switch (event) {
	case NETDEV_CHANGEMTU:
		/* A change in mtu is a bad thing, requiring
		 * LCP re-negotiation.
		 */

	case NETDEV_GOING_DOWN:
	case NETDEV_DOWN:
		/* Find every socket on this device and kill it. */
		pppoe_flush_dev(dev);
		break;

	default:
		break;
	};

	return NOTIFY_DONE;
}


static struct notifier_block pppoe_notifier = {
	.notifier_call = pppoe_device_event,
};


/************************************************************************
 *
 * Do the real work of receiving a PPPoE Session frame.
 *
 ***********************************************************************/
static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb)
{
	struct pppox_sock *po = pppox_sk(sk);
	struct pppox_sock *relay_po = NULL;

	if (sk->sk_state & PPPOX_BOUND) {
		struct pppoe_hdr *ph = (struct pppoe_hdr *) skb->nh.raw;
		int len = ntohs(ph->length);
		skb_pull_rcsum(skb, sizeof(struct pppoe_hdr));
		if (pskb_trim_rcsum(skb, len))
			goto abort_kfree;

		ppp_input(&po->chan, skb);
	} else if (sk->sk_state & PPPOX_RELAY) {
		relay_po = get_item_by_addr(&po->pppoe_relay);

		if (relay_po == NULL)
			goto abort_kfree;

		if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0)
			goto abort_put;

		skb_pull(skb, sizeof(struct pppoe_hdr));
		if (!__pppoe_xmit(sk_pppox(relay_po), skb))
			goto abort_put;
	} else {
		if (sock_queue_rcv_skb(sk, skb))
			goto abort_kfree;
	}

	return NET_RX_SUCCESS;

abort_put:
	sock_put(sk_pppox(relay_po));

abort_kfree:
	kfree_skb(skb);
	return NET_RX_DROP;
}

/************************************************************************
 *
 * Receive wrapper called in BH context.
 *
 ***********************************************************************/
static int pppoe_rcv(struct sk_buff *skb,
		     struct net_device *dev,
		     struct packet_type *pt,
		     struct net_device *orig_dev)

{
	struct pppoe_hdr *ph;
	struct pppox_sock *po;

	if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
		goto drop;

	if (!(skb = skb_share_check(skb, GFP_ATOMIC))) 
		goto out;

	ph = (struct pppoe_hdr *) skb->nh.raw;

	po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source);
	if (po != NULL) 
		return sk_receive_skb(sk_pppox(po), skb);
drop:
	kfree_skb(skb);
out:
	return NET_RX_DROP;
}

/************************************************************************
 *
 * Receive a PPPoE Discovery frame.
 * This is solely for detection of PADT frames
 *
 ***********************************************************************/
static int pppoe_disc_rcv(struct sk_buff *skb,
			  struct net_device *dev,
			  struct packet_type *pt,
			  struct net_device *orig_dev)

{
	struct pppoe_hdr *ph;
	struct pppox_sock *po;

	if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
		goto abort;

	if (!(skb = skb_share_check(skb, GFP_ATOMIC))) 
		goto out;

	ph = (struct pppoe_hdr *) skb->nh.raw;
	if (ph->code != PADT_CODE)
		goto abort;

	po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source);
	if (po) {
		struct sock *sk = sk_pppox(po);

		bh_lock_sock(sk);

		/* If the user has locked the socket, just ignore
		 * the packet.  With the way two rcv protocols hook into
		 * one socket family type, we cannot (easily) distinguish
		 * what kind of SKB it is during backlog rcv.
		 */
		if (sock_owned_by_user(sk) == 0) {
			/* We're no longer connect at the PPPOE layer,
			 * and must wait for ppp channel to disconnect us.
			 */
			sk->sk_state = PPPOX_ZOMBIE;
		}

		bh_unlock_sock(sk);
		sock_put(sk);
	}

abort:
	kfree_skb(skb);
out:
	return NET_RX_SUCCESS; /* Lies... :-) */
}

static struct packet_type pppoes_ptype = {
	.type	= __constant_htons(ETH_P_PPP_SES),
	.func	= pppoe_rcv,
};

static struct packet_type pppoed_ptype = {
	.type	= __constant_htons(ETH_P_PPP_DISC),
	.func	= pppoe_disc_rcv,
};

static struct proto pppoe_sk_proto = {
	.name	  = "PPPOE",
	.owner	  = THIS_MODULE,
	.obj_size = sizeof(struct pppox_sock),
};

/***********************************************************************
 *
 * Initialize a new struct sock.
 *
 **********************************************************************/
static int pppoe_create(struct socket *sock)
{
	int error = -ENOMEM;
	struct sock *sk;

	sk = sk_alloc(PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto, 1);
	if (!sk)
		goto out;

	sock_init_data(sock, sk);

	sock->state = SS_UNCONNECTED;
	sock->ops   = &pppoe_ops;

	sk->sk_backlog_rcv = pppoe_rcv_core;
	sk->sk_state	   = PPPOX_NONE;
	sk->sk_type	   = SOCK_STREAM;
	sk->sk_family	   = PF_PPPOX;
	sk->sk_protocol	   = PX_PROTO_OE;

	error = 0;
out:	return error;
}

static int pppoe_release(struct socket *sock)
{
	struct sock *sk = sock->sk;
	struct pppox_sock *po;
	int error = 0;

	if (!sk)
		return 0;

	if (sock_flag(sk, SOCK_DEAD))
		return -EBADF;

	pppox_unbind_sock(sk);

	/* Signal the death of the socket. */
	sk->sk_state = PPPOX_DEAD;

	po = pppox_sk(sk);
	if (po->pppoe_pa.sid) {
		delete_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
	}

	if (po->pppoe_dev)
		dev_put(po->pppoe_dev);

	po->pppoe_dev = NULL;

	sock_orphan(sk);
	sock->sk = NULL;

	skb_queue_purge(&sk->sk_receive_queue);
	sock_put(sk);

	return error;
}


static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
		  int sockaddr_len, int flags)
{
	struct sock *sk = sock->sk;
	struct net_device *dev = NULL;
	struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
	struct pppox_sock *po = pppox_sk(sk);
	int error;

	lock_sock(sk);

	error = -EINVAL;
	if (sp->sa_protocol != PX_PROTO_OE)
		goto end;

	/* Check for already bound sockets */
	error = -EBUSY;
	if ((sk->sk_state & PPPOX_CONNECTED) && sp->sa_addr.pppoe.sid)
		goto end;

	/* Check for already disconnected sockets, on attempts to disconnect */
	error = -EALREADY;
	if ((sk->sk_state & PPPOX_DEAD) && !sp->sa_addr.pppoe.sid )
		goto end;

	error = 0;
	if (po->pppoe_pa.sid) {
		pppox_unbind_sock(sk);

		/* Delete the old binding */
		delete_item(po->pppoe_pa.sid,po->pppoe_pa.remote);

		if(po->pppoe_dev)
			dev_put(po->pppoe_dev);

		memset(sk_pppox(po) + 1, 0,
		       sizeof(struct pppox_sock) - sizeof(struct sock));

		sk->sk_state = PPPOX_NONE;
	}

	/* Don't re-bind if sid==0 */
	if (sp->sa_addr.pppoe.sid != 0) {
		dev = dev_get_by_name(sp->sa_addr.pppoe.dev);

		error = -ENODEV;
		if (!dev)
			goto end;

		po->pppoe_dev = dev;

		if (!(dev->flags & IFF_UP))
			goto err_put;

		memcpy(&po->pppoe_pa,
		       &sp->sa_addr.pppoe,
		       sizeof(struct pppoe_addr));

		error = set_item(po);
		if (error < 0)
			goto err_put;

		po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
				   dev->hard_header_len);

		po->chan.private = sk;
		po->chan.ops = &pppoe_chan_ops;

		error = ppp_register_channel(&po->chan);
		if (error)
			goto err_put;

		sk->sk_state = PPPOX_CONNECTED;
	}

	po->num = sp->sa_addr.pppoe.sid;

 end:
	release_sock(sk);
	return error;
err_put:
	if (po->pppoe_dev) {
		dev_put(po->pppoe_dev);
		po->pppoe_dev = NULL;
	}
	goto end;
}


static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr,
		  int *usockaddr_len, int peer)
{
	int len = sizeof(struct sockaddr_pppox);
	struct sockaddr_pppox sp;

	sp.sa_family	= AF_PPPOX;
	sp.sa_protocol	= PX_PROTO_OE;
	memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa,
	       sizeof(struct pppoe_addr));

	memcpy(uaddr, &sp, len);

	*usockaddr_len = len;

	return 0;
}


static int pppoe_ioctl(struct socket *sock, unsigned int cmd,
		unsigned long arg)
{
	struct sock *sk = sock->sk;
	struct pppox_sock *po = pppox_sk(sk);
	int val = 0;
	int err = 0;

	switch (cmd) {
	case PPPIOCGMRU:
		err = -ENXIO;

		if (!(sk->sk_state & PPPOX_CONNECTED))
			break;

		err = -EFAULT;
		if (put_user(po->pppoe_dev->mtu -
			     sizeof(struct pppoe_hdr) -
			     PPP_HDRLEN,
			     (int __user *) arg))
			break;
		err = 0;
		break;

	case PPPIOCSMRU:
		err = -ENXIO;
		if (!(sk->sk_state & PPPOX_CONNECTED))
			break;

		err = -EFAULT;
		if (get_user(val,(int __user *) arg))
			break;

		if (val < (po->pppoe_dev->mtu
			   - sizeof(struct pppoe_hdr)
			   - PPP_HDRLEN))
			err = 0;
		else
			err = -EINVAL;
		break;

	case PPPIOCSFLAGS:
		err = -EFAULT;
		if (get_user(val, (int __user *) arg))
			break;
		err = 0;
		break;

	case PPPOEIOCSFWD:
	{
		struct pppox_sock *relay_po;

		err = -EBUSY;
		if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD))
			break;

		err = -ENOTCONN;
		if (!(sk->sk_state & PPPOX_CONNECTED))
			break;

		/* PPPoE address from the user specifies an outbound
		   PPPoE address to which frames are forwarded to */
		err = -EFAULT;
		if (copy_from_user(&po->pppoe_relay,
				   (void __user *)arg,
				   sizeof(struct sockaddr_pppox)))
			break;

		err = -EINVAL;
		if (po->pppoe_relay.sa_family != AF_PPPOX ||
		    po->pppoe_relay.sa_protocol!= PX_PROTO_OE)
			break;

		/* Check that the socket referenced by the address
		   actually exists. */
		relay_po = get_item_by_addr(&po->pppoe_relay);

		if (!relay_po)
			break;

		sock_put(sk_pppox(relay_po));
		sk->sk_state |= PPPOX_RELAY;
		err = 0;
		break;
	}

	case PPPOEIOCDFWD:
		err = -EALREADY;
		if (!(sk->sk_state & PPPOX_RELAY))
			break;

		sk->sk_state &= ~PPPOX_RELAY;
		err = 0;
		break;

	default:;
	};

	return err;
}


static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock, 
		  struct msghdr *m, size_t total_len)
{
	struct sk_buff *skb = NULL;
	struct sock *sk = sock->sk;
	struct pppox_sock *po = pppox_sk(sk);
	int error = 0;
	struct pppoe_hdr hdr;
	struct pppoe_hdr *ph;
	struct net_device *dev;
	char *start;

	if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) {
		error = -ENOTCONN;
		goto end;
	}

	hdr.ver = 1;
	hdr.type = 1;
	hdr.code = 0;
	hdr.sid = po->num;

	lock_sock(sk);

	dev = po->pppoe_dev;

	error = -EMSGSIZE;
 	if (total_len > (dev->mtu + dev->hard_header_len))
		goto end;


	skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32,
			   0, GFP_KERNEL);
	if (!skb) {
		error = -ENOMEM;
		goto end;
	}

	/* Reserve space for headers. */
	skb_reserve(skb, dev->hard_header_len);
	skb->nh.raw = skb->data;

	skb->dev = dev;

	skb->priority = sk->sk_priority;
	skb->protocol = __constant_htons(ETH_P_PPP_SES);

	ph = (struct pppoe_hdr *) skb_put(skb, total_len + sizeof(struct pppoe_hdr));
	start = (char *) &ph->tag[0];

	error = memcpy_fromiovec(start, m->msg_iov, total_len);

	if (error < 0) {
		kfree_skb(skb);
		goto end;
	}

	error = total_len;
	dev->hard_header(skb, dev, ETH_P_PPP_SES,
			 po->pppoe_pa.remote, NULL, total_len);

	memcpy(ph, &hdr, sizeof(struct pppoe_hdr));

	ph->length = htons(total_len);

	dev_queue_xmit(skb);

end:
	release_sock(sk);
	return error;
}


/************************************************************************
 *
 * xmit function for internal use.
 *
 ***********************************************************************/
static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
{
	struct pppox_sock *po = pppox_sk(sk);
	struct net_device *dev = po->pppoe_dev;
	struct pppoe_hdr hdr;
	struct pppoe_hdr *ph;
	int headroom = skb_headroom(skb);
	int data_len = skb->len;
	struct sk_buff *skb2;

	if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
		goto abort;

	hdr.ver	= 1;
	hdr.type = 1;
	hdr.code = 0;
	hdr.sid	= po->num;
	hdr.length = htons(skb->len);

	if (!dev)
		goto abort;

	/* Copy the skb if there is no space for the header. */
	if (headroom < (sizeof(struct pppoe_hdr) + dev->hard_header_len)) {
		skb2 = dev_alloc_skb(32+skb->len +
				     sizeof(struct pppoe_hdr) +
				     dev->hard_header_len);

		if (skb2 == NULL)
			goto abort;

		skb_reserve(skb2, dev->hard_header_len + sizeof(struct pppoe_hdr));
		memcpy(skb_put(skb2, skb->len), skb->data, skb->len);
	} else {
		/* Make a clone so as to not disturb the original skb,
		 * give dev_queue_xmit something it can free.
		 */
		skb2 = skb_clone(skb, GFP_ATOMIC);
	}

	ph = (struct pppoe_hdr *) skb_push(skb2, sizeof(struct pppoe_hdr));
	memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
	skb2->protocol = __constant_htons(ETH_P_PPP_SES);

	skb2->nh.raw = skb2->data;

	skb2->dev = dev;

	dev->hard_header(skb2, dev, ETH_P_PPP_SES,
			 po->pppoe_pa.remote, NULL, data_len);

	/* We're transmitting skb2, and assuming that dev_queue_xmit
	 * will free it.  The generic ppp layer however, is expecting
	 * that we give back 'skb' (not 'skb2') in case of failure,
	 * but free it in case of success.
	 */

	if (dev_queue_xmit(skb2) < 0)
		goto abort;

	kfree_skb(skb);
	return 1;

abort:
	return 0;
}


/************************************************************************
 *
 * xmit function called by generic PPP driver
 * sends PPP frame over PPPoE socket
 *
 ***********************************************************************/
static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
{
	struct sock *sk = (struct sock *) chan->private;
	return __pppoe_xmit(sk, skb);
}


static struct ppp_channel_ops pppoe_chan_ops = { 
	.start_xmit = pppoe_xmit, 
};

static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock,
		  struct msghdr *m, size_t total_len, int flags)
{
	struct sock *sk = sock->sk;
	struct sk_buff *skb = NULL;
	int error = 0;
	int len;
	struct pppoe_hdr *ph = NULL;

	if (sk->sk_state & PPPOX_BOUND) {
		error = -EIO;
		goto end;
	}

	skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
				flags & MSG_DONTWAIT, &error);

	if (error < 0) {
		goto end;
	}

	m->msg_namelen = 0;

	if (skb) {
		error = 0;
		ph = (struct pppoe_hdr *) skb->nh.raw;
		len = ntohs(ph->length);

		error = memcpy_toiovec(m->msg_iov, (unsigned char *) &ph->tag[0], len);
		if (error < 0)
			goto do_skb_free;
		error = len;
	}

do_skb_free:
	if (skb)
		kfree_skb(skb);
end:
	return error;
}

#ifdef CONFIG_PROC_FS
static int pppoe_seq_show(struct seq_file *seq, void *v)
{
	struct pppox_sock *po;
	char *dev_name;

	if (v == SEQ_START_TOKEN) {
		seq_puts(seq, "Id       Address              Device\n");
		goto out;
	}

	po = v;
	dev_name = po->pppoe_pa.dev;

	seq_printf(seq, "%08X %02X:%02X:%02X:%02X:%02X:%02X %8s\n",
		   po->pppoe_pa.sid,
		   po->pppoe_pa.remote[0], po->pppoe_pa.remote[1],
		   po->pppoe_pa.remote[2], po->pppoe_pa.remote[3],
		   po->pppoe_pa.remote[4], po->pppoe_pa.remote[5], dev_name);
out:
	return 0;
}

static __inline__ struct pppox_sock *pppoe_get_idx(loff_t pos)
{
	struct pppox_sock *po = NULL;
	int i = 0;

	for (; i < PPPOE_HASH_SIZE; i++) {
		po = item_hash_table[i];
		while (po) {
			if (!pos--)
				goto out;
			po = po->next;
		}
	}
out:
	return po;
}

static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos)
{
	loff_t l = *pos;

	read_lock_bh(&pppoe_hash_lock);
	return l ? pppoe_get_idx(--l) : SEQ_START_TOKEN;
}

static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct pppox_sock *po;

	++*pos;
	if (v == SEQ_START_TOKEN) {
		po = pppoe_get_idx(0);
		goto out;
	}
	po = v;
	if (po->next) 
		po = po->next;
	else {
		int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);

		while (++hash < PPPOE_HASH_SIZE) {
			po = item_hash_table[hash];
			if (po)
				break;
		}
	}
out:
	return po;
}

static void pppoe_seq_stop(struct seq_file *seq, void *v)
{
	read_unlock_bh(&pppoe_hash_lock);
}

static struct seq_operations pppoe_seq_ops = {
	.start		= pppoe_seq_start,
	.next		= pppoe_seq_next,
	.stop		= pppoe_seq_stop,
	.show		= pppoe_seq_show,
};

static int pppoe_seq_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &pppoe_seq_ops);
}

static struct file_operations pppoe_seq_fops = {
	.owner		= THIS_MODULE,
	.open		= pppoe_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static int __init pppoe_proc_init(void)
{
	struct proc_dir_entry *p;

	p = create_proc_entry("net/pppoe", S_IRUGO, NULL);
	if (!p)
		return -ENOMEM;

	p->proc_fops = &pppoe_seq_fops;
	return 0;
}
#else /* CONFIG_PROC_FS */
static inline int pppoe_proc_init(void) { return 0; }
#endif /* CONFIG_PROC_FS */

static const struct proto_ops pppoe_ops = {
    .family		= AF_PPPOX,
    .owner		= THIS_MODULE,
    .release		= pppoe_release,
    .bind		= sock_no_bind,
    .connect		= pppoe_connect,
    .socketpair		= sock_no_socketpair,
    .accept		= sock_no_accept,
    .getname		= pppoe_getname,
    .poll		= datagram_poll,
    .listen		= sock_no_listen,
    .shutdown		= sock_no_shutdown,
    .setsockopt		= sock_no_setsockopt,
    .getsockopt		= sock_no_getsockopt,
    .sendmsg		= pppoe_sendmsg,
    .recvmsg		= pppoe_recvmsg,
    .mmap		= sock_no_mmap,
    .ioctl		= pppox_ioctl,
};

static struct pppox_proto pppoe_proto = {
    .create	= pppoe_create,
    .ioctl	= pppoe_ioctl,
    .owner	= THIS_MODULE,
};


static int __init pppoe_init(void)
{
	int err = proto_register(&pppoe_sk_proto, 0);

	if (err)
		goto out;

 	err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
	if (err)
		goto out_unregister_pppoe_proto;

	err = pppoe_proc_init();
	if (err)
		goto out_unregister_pppox_proto;
	
	dev_add_pack(&pppoes_ptype);
	dev_add_pack(&pppoed_ptype);
	register_netdevice_notifier(&pppoe_notifier);
out:
	return err;
out_unregister_pppox_proto:
	unregister_pppox_proto(PX_PROTO_OE);
out_unregister_pppoe_proto:
	proto_unregister(&pppoe_sk_proto);
	goto out;
}

static void __exit pppoe_exit(void)
{
	unregister_pppox_proto(PX_PROTO_OE);
	dev_remove_pack(&pppoes_ptype);
	dev_remove_pack(&pppoed_ptype);
	unregister_netdevice_notifier(&pppoe_notifier);
	remove_proc_entry("net/pppoe", NULL);
	proto_unregister(&pppoe_sk_proto);
}

module_init(pppoe_init);
module_exit(pppoe_exit);

MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
MODULE_DESCRIPTION("PPP over Ethernet driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_PPPOX);