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linux/drivers/net/pppoe.c

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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: 0.7.0
*
* 070228 : Fix to allow multiple sessions with same remote MAC and same
* session id by including the local device ifindex in the
* tuple identifying a session. This also ensures packets can't
* be injected into a session from interfaces other than the one
* specified by userspace. Florian Zumbiehl <florz@florz.de>
* (Oh, BTW, this one is YYMMDD, in case you were wondering ...)
* 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/net_namespace.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, __be16 sid, char *addr)
{
return (a->sid == sid &&
(memcmp(a->remote,addr,ETH_ALEN) == 0));
}
#if 8%PPPOE_HASH_BITS
#error 8 must be a multiple of PPPOE_HASH_BITS
#endif
static int hash_item(__be16 sid, unsigned char *addr)
{
unsigned char hash = 0;
unsigned int i;
for (i = 0 ; i < ETH_ALEN ; i++) {
hash ^= addr[i];
}
for (i = 0 ; i < sizeof(sid_t)*8 ; i += 8 ){
hash ^= (__force __u32)sid>>i;
}
for (i = 8 ; (i>>=1) >= PPPOE_HASH_BITS ; ) {
hash ^= hash>>i;
}
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(__be16 sid, unsigned char *addr, int ifindex)
{
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->pppoe_ifindex == ifindex))
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) && ret->pppoe_ifindex == po->pppoe_ifindex)
return -EALREADY;
ret = ret->next;
}
po->next = item_hash_table[hash];
item_hash_table[hash] = po;
return 0;
}
static struct pppox_sock *__delete_item(__be16 sid, char *addr, int ifindex)
{
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) && ret->pppoe_ifindex == ifindex) {
*src = ret->next;
break;
}
src = &ret->next;
ret = ret->next;
}
return ret;
}
/**********************************************************************
*
* Set/get/delete/rehash items
*
**********************************************************************/
static inline struct pppox_sock *get_item(__be16 sid,
unsigned char *addr, int ifindex)
{
struct pppox_sock *po;
read_lock_bh(&pppoe_hash_lock);
po = __get_item(sid, addr, ifindex);
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)
{
struct net_device *dev;
int ifindex;
dev = dev_get_by_name(&init_net, sp->sa_addr.pppoe.dev);
if(!dev)
return NULL;
ifindex = dev->ifindex;
dev_put(dev);
return get_item(sp->sa_addr.pppoe.sid, sp->sa_addr.pppoe.remote, ifindex);
}
static inline struct pppox_sock *delete_item(__be16 sid, char *addr, int ifindex)
{
struct pppox_sock *ret;
write_lock_bh(&pppoe_hash_lock);
ret = __delete_item(sid, addr, ifindex);
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);
write_lock_bh(&pppoe_hash_lock);
for (hash = 0; hash < PPPOE_HASH_SIZE; hash++) {
struct pppox_sock *po = item_hash_table[hash];
while (po != NULL) {
struct sock *sk = sk_pppox(po);
if (po->pppoe_dev != dev) {
po = po->next;
continue;
}
po->pppoe_dev = NULL;
dev_put(dev);
/* We always grab the socket lock, followed by the
* pppoe_hash_lock, in that order. Since we should
* hold the sock lock while doing any unbinding,
* we need to release the lock we're holding.
* Hold a reference to the sock so it doesn't disappear
* as we're jumping between locks.
*/
sock_hold(sk);
write_unlock_bh(&pppoe_hash_lock);
lock_sock(sk);
if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
pppox_unbind_sock(sk);
sk->sk_state = PPPOX_ZOMBIE;
sk->sk_state_change(sk);
}
release_sock(sk);
sock_put(sk);
/* Restart scan at the beginning of this hash chain.
* While the lock was dropped the chain contents may
* have changed.
*/
write_lock_bh(&pppoe_hash_lock);
po = item_hash_table[hash];
}
}
write_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;
if (dev_net(dev) != &init_net)
return NOTIFY_DONE;
/* 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;
if (sk->sk_state & PPPOX_BOUND) {
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;
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;
int len;
if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
goto out;
if (dev_net(dev) != &init_net)
goto drop;
if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
goto drop;
ph = pppoe_hdr(skb);
len = ntohs(ph->length);
skb_pull_rcsum(skb, sizeof(*ph));
if (skb->len < len)
goto drop;
po = get_item(ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
if (!po)
goto drop;
if (pskb_trim_rcsum(skb, len))
goto drop;
return sk_receive_skb(sk_pppox(po), skb, 0);
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 (dev_net(dev) != &init_net)
goto abort;
if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
goto out;
if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
goto abort;
ph = pppoe_hdr(skb);
if (ph->code != PADT_CODE)
goto abort;
po = get_item(ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
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 net *net, struct socket *sock)
{
int error = -ENOMEM;
struct sock *sk;
sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto);
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;
if (!sk)
return 0;
lock_sock(sk);
if (sock_flag(sk, SOCK_DEAD)){
release_sock(sk);
return -EBADF;
}
pppox_unbind_sock(sk);
/* Signal the death of the socket. */
sk->sk_state = PPPOX_DEAD;
/* Write lock on hash lock protects the entire "po" struct from
* concurrent updates via pppoe_flush_dev. The "po" struct should
* be considered part of the hash table contents, thus protected
* by the hash table lock */
write_lock_bh(&pppoe_hash_lock);
po = pppox_sk(sk);
if (po->pppoe_pa.sid) {
__delete_item(po->pppoe_pa.sid,
po->pppoe_pa.remote, po->pppoe_ifindex);
}
if (po->pppoe_dev) {
dev_put(po->pppoe_dev);
po->pppoe_dev = NULL;
}
write_unlock_bh(&pppoe_hash_lock);
sock_orphan(sk);
sock->sk = NULL;
skb_queue_purge(&sk->sk_receive_queue);
release_sock(sk);
sock_put(sk);
return 0;
}
static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
int sockaddr_len, int flags)
{
struct sock *sk = sock->sk;
struct net_device *dev;
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,po->pppoe_ifindex);
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(&init_net, sp->sa_addr.pppoe.dev);
error = -ENODEV;
if (!dev)
goto end;
po->pppoe_dev = dev;
po->pppoe_ifindex = dev->ifindex;
write_lock_bh(&pppoe_hash_lock);
if (!(dev->flags & IFF_UP)){
write_unlock_bh(&pppoe_hash_lock);
goto err_put;
}
memcpy(&po->pppoe_pa,
&sp->sa_addr.pppoe,
sizeof(struct pppoe_addr));
error = __set_item(po);
write_unlock_bh(&pppoe_hash_lock);
if (error < 0)
goto err_put;
po->chan.hdrlen = (sizeof(struct pppoe_hdr) +
dev->hard_header_len);
po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr);
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;
int err;
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 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:
err = -ENOTTY;
}
return err;
}
static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *m, size_t total_len)
{
struct sk_buff *skb;
struct sock *sk = sock->sk;
struct pppox_sock *po = pppox_sk(sk);
int error;
struct pppoe_hdr hdr;
struct pppoe_hdr *ph;
struct net_device *dev;
char *start;
lock_sock(sk);
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;
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_reset_network_header(skb);
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 *ph;
int data_len = skb->len;
if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
goto abort;
if (!dev)
goto abort;
/* Copy the data if there is no space for the header or if it's
* read-only.
*/
if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len))
goto abort;
__skb_push(skb, sizeof(*ph));
skb_reset_network_header(skb);
ph = pppoe_hdr(skb);
ph->ver = 1;
ph->type = 1;
ph->code = 0;
ph->sid = po->num;
ph->length = htons(data_len);
skb->protocol = __constant_htons(ETH_P_PPP_SES);
skb->dev = dev;
dev_hard_header(skb, dev, ETH_P_PPP_SES,
po->pppoe_pa.remote, NULL, data_len);
dev_queue_xmit(skb);
return 1;
abort:
kfree_skb(skb);
return 1;
}
/************************************************************************
*
* 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;
int error = 0;
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) {
total_len = min(total_len, skb->len);
error = skb_copy_datagram_iovec(skb, 0, m->msg_iov, total_len);
if (error == 0)
error = total_len;
}
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;
DECLARE_MAC_BUF(mac);
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 %s %8s\n",
po->pppoe_pa.sid, print_mac(mac, po->pppoe_pa.remote), dev_name);
out:
return 0;
}
static __inline__ struct pppox_sock *pppoe_get_idx(loff_t pos)
{
struct pppox_sock *po;
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)
__acquires(pppoe_hash_lock)
{
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)
__releases(pppoe_hash_lock)
{
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 const 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 = proc_net_fops_create(&init_net, "pppoe", S_IRUGO, &pppoe_seq_fops);
if (!p)
return -ENOMEM;
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("pppoe", init_net.proc_net);
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);
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