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/** -*- linux-c -*- ***********************************************************
* Linux PPP over Ethernet (PPPoX/PPPoE) Sockets
*
* PPPoX --- Generic PPP encapsulation socket family
* PPPoE --- PPP over Ethernet (RFC 2516)
*
*
* Version: 0.6.9
*
* 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).
*
* Author: Michal Ostrowski <mostrows@speakeasy.net>
* Contributors:
* Arnaldo Carvalho de Melo <acme@xconectiva.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 <asm/uaccess.h>
#include <linux/kernel.h>
#include <linux/sched.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 <net/sock.h>
#include <linux/ppp_channel.h>
#include <linux/ppp_defs.h>
#include <linux/if_ppp.h>
#include <linux/if_pppvar.h>
#include <linux/notifier.h>
#include <linux/file.h>
#include <linux/proc_fs.h>
static int __attribute__((unused)) pppoe_debug = 7;
#define PPPOE_HASH_BITS 4
#define PPPOE_HASH_SIZE (1<<PPPOE_HASH_BITS)
int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb);
int __pppoe_xmit(struct sock *sk, struct sk_buff *skb);
struct proto_ops pppoe_ops;
#if 0
#define CHECKPTR(x,y) { if (!(x) && pppoe_debug &7 ){ printk(KERN_CRIT "PPPoE Invalid pointer : %s , %p\n",#x,(x)); error=-EINVAL; goto y; }}
#define DEBUG(s,args...) if( pppoe_debug & (s) ) printk(KERN_CRIT args );
#else
#define CHECKPTR(x,y) do {} while (0);
#define DEBUG(s,args...) do { } while (0);
#endif
static rwlock_t pppoe_hash_lock = RW_LOCK_UNLOCKED;
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 );
}
static struct pppox_opt *item_hash_table[PPPOE_HASH_SIZE] = { 0, };
/**********************************************************************
*
* Set/get/delete/rehash items (internal versions)
*
**********************************************************************/
static struct pppox_opt *__get_item(unsigned long sid, unsigned char *addr)
{
int hash = hash_item(sid, addr);
struct pppox_opt *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_opt *po)
{
int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
struct pppox_opt *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_opt *__delete_item(unsigned long sid, char *addr)
{
int hash = hash_item(sid, addr);
struct pppox_opt *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_opt *get_item(unsigned long sid,
unsigned char *addr)
{
struct pppox_opt *po;
read_lock_bh(&pppoe_hash_lock);
po = __get_item(sid, addr);
if (po)
sock_hold(po->sk);
read_unlock_bh(&pppoe_hash_lock);
return po;
}
static inline struct pppox_opt *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_opt *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_opt *delete_item(unsigned long sid, char *addr)
{
struct pppox_opt *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;
if (dev == NULL)
BUG();
read_lock_bh(&pppoe_hash_lock);
for (hash = 0; hash < PPPOE_HASH_SIZE; hash++) {
struct pppox_opt *po = item_hash_table[hash];
while (po != NULL) {
if (po->pppoe_dev == dev) {
struct sock *sk = po->sk;
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->state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
pppox_unbind_sock(sk);
dev_put(dev);
sk->state = PPPOX_DEAD;
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 guarenteed 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.
*
***********************************************************************/
int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb)
{
struct pppox_opt *po = sk->protinfo.pppox;
struct pppox_opt *relay_po = NULL;
if (sk->state & PPPOX_BOUND) {
skb_pull(skb, sizeof(struct pppoe_hdr));
ppp_input(&po->chan, skb);
} else if (sk->state & PPPOX_RELAY) {
relay_po = get_item_by_addr(&po->pppoe_relay);
if (relay_po == NULL)
goto abort_kfree;
if ((relay_po->sk->state & PPPOX_CONNECTED) == 0)
goto abort_put;
skb_pull(skb, sizeof(struct pppoe_hdr));
if (!__pppoe_xmit( relay_po->sk , skb))
goto abort_put;
} else {
sock_queue_rcv_skb(sk, skb);
}
return NET_RX_SUCCESS;
abort_put:
sock_put(relay_po->sk);
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 pppoe_hdr *ph = (struct pppoe_hdr *) skb->nh.raw;
struct pppox_opt *po;
struct sock *sk ;
int ret;
po = get_item((unsigned long) ph->sid, skb->mac.ethernet->h_source);
if (!po) {
kfree_skb(skb);
return NET_RX_DROP;
}
sk = po->sk;
bh_lock_sock(sk);
/* Socket state is unknown, must put skb into backlog. */
if (sk->lock.users != 0) {
sk_add_backlog(sk, skb);
ret = NET_RX_SUCCESS;
} else {
ret = pppoe_rcv_core(sk, skb);
}
bh_unlock_sock(sk);
sock_put(sk);
return ret;
}
/************************************************************************
*
* 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 pppoe_hdr *ph = (struct pppoe_hdr *) skb->nh.raw;
struct pppox_opt *po;
if (ph->code != PADT_CODE)
goto abort;
po = get_item((unsigned long) ph->sid, skb->mac.ethernet->h_source);
if (po) {
struct sock *sk = po->sk;
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 (sk->lock.users == 0)
pppox_unbind_sock(sk);
bh_unlock_sock(sk);
sock_put(sk);
}
abort:
kfree_skb(skb);
return NET_RX_SUCCESS; /* Lies... :-) */
}
struct packet_type pppoes_ptype = {
type: __constant_htons(ETH_P_PPP_SES),
func: pppoe_rcv,
};
struct packet_type pppoed_ptype = {
type: __constant_htons(ETH_P_PPP_DISC),
func: pppoe_disc_rcv,
};
/***********************************************************************
*
* Really kill the socket. (Called from sock_put if refcnt == 0.)
*
**********************************************************************/
void pppoe_sock_destruct(struct sock *sk)
{
if (sk->protinfo.destruct_hook)
kfree(sk->protinfo.destruct_hook);
MOD_DEC_USE_COUNT;
}
/***********************************************************************
*
* Initialize a new struct sock.
*
**********************************************************************/
static int pppoe_create(struct socket *sock)
{
int error = 0;
struct sock *sk;
MOD_INC_USE_COUNT;
sk = sk_alloc(PF_PPPOX, GFP_KERNEL, 1);
if (!sk)
return -ENOMEM;
sock_init_data(sock, sk);
sock->state = SS_UNCONNECTED;
sock->ops = &pppoe_ops;
sk->protocol = PX_PROTO_OE;
sk->family = PF_PPPOX;
sk->backlog_rcv = pppoe_rcv_core;
sk->next = NULL;
sk->pprev = NULL;
sk->state = PPPOX_NONE;
sk->type = SOCK_STREAM;
sk->destruct = pppoe_sock_destruct;
sk->protinfo.pppox = kmalloc(sizeof(struct pppox_opt), GFP_KERNEL);
if (!sk->protinfo.pppox) {
error = -ENOMEM;
goto free_sk;
}
memset((void *) sk->protinfo.pppox, 0, sizeof(struct pppox_opt));
sk->protinfo.pppox->sk = sk;
/* Delete the protinfo when it is time to do so. */
sk->protinfo.destruct_hook = sk->protinfo.pppox;
sock->sk = sk;
return 0;
free_sk:
sk_free(sk);
return error;
}
int pppoe_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct pppox_opt *po;
int error = 0;
if (!sk)
return 0;
if (sk->dead != 0)
return -EBADF;
pppox_unbind_sock(sk);
/* Signal the death of the socket. */
sk->state = PPPOX_DEAD;
po = sk->protinfo.pppox;
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->receive_queue);
sock_put(sk);
return error;
}
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_opt *po = sk->protinfo.pppox;
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->state & PPPOX_CONNECTED) && sp->sa_addr.pppoe.sid)
goto end;
/* Check for already disconnected sockets,
on attempts to disconnect */
error = -EALREADY;
if((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);
dev_put(po->pppoe_dev);
memset(po, 0, sizeof(struct pppox_opt));
po->sk = 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->state = PPPOX_CONNECTED;
}
sk->num = sp->sa_addr.pppoe.sid;
end:
release_sock(sk);
return error;
err_put:
dev_put(po->pppoe_dev);
po->pppoe_dev = NULL;
goto end;
}
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, &sock->sk->protinfo.pppox->pppoe_pa,
sizeof(struct pppoe_addr));
memcpy(uaddr, &sp, len);
*usockaddr_len = len;
return 0;
}
int pppoe_ioctl(struct socket *sock, unsigned int cmd,
unsigned long arg)
{
struct sock *sk = sock->sk;
struct pppox_opt *po;
int val = 0;
int err = 0;
po = sk->protinfo.pppox;
switch (cmd) {
case PPPIOCGMRU:
err = -ENXIO;
if (!(sk->state & PPPOX_CONNECTED))
break;
err = -EFAULT;
if (put_user(po->pppoe_dev->mtu -
sizeof(struct pppoe_hdr) -
PPP_HDRLEN,
(int *) arg))
break;
err = 0;
break;
case PPPIOCSMRU:
err = -ENXIO;
if (!(sk->state & PPPOX_CONNECTED))
break;
err = -EFAULT;
if (get_user(val,(int *) 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 *) arg))
break;
err = 0;
break;
case PPPOEIOCSFWD:
{
struct pppox_opt *relay_po;
err = -EBUSY;
if (sk->state & PPPOX_BOUND)
break;
err = -ENOTCONN;
if (!(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*)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(relay_po->sk);
sk->state |= PPPOX_RELAY;
err = 0;
break;
}
case PPPOEIOCDFWD:
err = -EALREADY;
if (!(sk->state & PPPOX_RELAY))
break;
sk->state &= ~PPPOX_RELAY;
err = 0;
break;
default:;
};
return err;
}
int pppoe_sendmsg(struct socket *sock, struct msghdr *m,
int total_len, struct scm_cookie *scm)
{
struct sk_buff *skb = NULL;
struct sock *sk = sock->sk;
int error = 0;
struct pppoe_hdr hdr;
struct pppoe_hdr *ph;
struct net_device *dev;
char *start;
if (sk->dead || !(sk->state & PPPOX_CONNECTED)) {
error = -ENOTCONN;
goto end;
}
hdr.ver = 1;
hdr.type = 1;
hdr.code = 0;
hdr.sid = sk->num;
lock_sock(sk);
dev = sk->protinfo.pppox->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->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,
sk->protinfo.pppox->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.
*
***********************************************************************/
int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
{
struct net_device *dev = sk->protinfo.pppox->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 (sk->dead || !(sk->state & PPPOX_CONNECTED))
goto abort;
hdr.ver = 1;
hdr.type = 1;
hdr.code = 0;
hdr.sid = sk->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,
sk->protinfo.pppox->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
*
***********************************************************************/
int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
{
struct sock *sk = (struct sock *) chan->private;
return __pppoe_xmit(sk, skb);
}
struct ppp_channel_ops pppoe_chan_ops = { pppoe_xmit , NULL };
int pppoe_rcvmsg(struct socket *sock, struct msghdr *m, int total_len, int flags, struct scm_cookie *scm)
{
struct sock *sk = sock->sk;
struct sk_buff *skb = NULL;
int error = 0;
int len;
struct pppoe_hdr *ph = NULL;
if (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;
}
int pppoe_proc_info(char *buffer, char **start, off_t offset, int length)
{
struct pppox_opt *po;
int len = 0;
off_t pos = 0;
off_t begin = 0;
int size;
int i;
len += sprintf(buffer,
"Id Address Device\n");
pos = len;
write_lock_bh(&pppoe_hash_lock);
for (i = 0; i < PPPOE_HASH_SIZE; i++) {
po = item_hash_table[i];
while (po) {
char *dev = po->pppoe_pa.dev;
size = sprintf(buffer + len,
"%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);
len += size;
pos += size;
if (pos < offset) {
len = 0;
begin = pos;
}
if (pos > offset + length)
break;
po = po->next;
}
if (po)
break;
}
write_unlock_bh(&pppoe_hash_lock);
*start = buffer + (offset - begin);
len -= (offset - begin);
if (len > length)
len = length;
if (len < 0)
len = 0;
return len;
}
struct proto_ops pppoe_ops = {
family: AF_PPPOX,
release: pppoe_release,
bind: sock_no_bind,
connect: pppoe_connect,
socketpair: sock_no_socketpair,
accept: sock_no_accept,
getname: pppoe_getname,
poll: datagram_poll,
ioctl: pppoe_ioctl,
listen: sock_no_listen,
shutdown: sock_no_shutdown,
setsockopt: sock_no_setsockopt,
getsockopt: sock_no_getsockopt,
sendmsg: pppoe_sendmsg,
recvmsg: pppoe_rcvmsg,
mmap: sock_no_mmap
};
struct pppox_proto pppoe_proto = {
create: pppoe_create,
ioctl: pppoe_ioctl
};
int __init pppoe_init(void)
{
int err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
if (err == 0) {
dev_add_pack(&pppoes_ptype);
dev_add_pack(&pppoed_ptype);
register_netdevice_notifier(&pppoe_notifier);
proc_net_create("pppoe", 0, pppoe_proc_info);
}
return err;
}
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);
proc_net_remove("pppoe");
}
module_init(pppoe_init);
module_exit(pppoe_exit);
MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
MODULE_DESCRIPTION("PPP over Ethernet driver");
MODULE_LICENSE("GPL");
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