/** -*- 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/ppp-ioctl.h>
|
#include <linux/notifier.h>
|
#include <linux/file.h>
|
#include <linux/proc_fs.h>
|
#include <linux/seq_file.h>
|
|
#include <linux/nsproxy.h>
|
#include <net/net_namespace.h>
|
#include <net/netns/generic.h>
|
#include <net/sock.h>
|
|
#include <linux/uaccess.h>
|
|
#define PPPOE_HASH_BITS 4
|
#define PPPOE_HASH_SIZE (1 << PPPOE_HASH_BITS)
|
#define PPPOE_HASH_MASK (PPPOE_HASH_SIZE - 1)
|
|
static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb);
|
|
static const struct proto_ops pppoe_ops;
|
static const struct ppp_channel_ops pppoe_chan_ops;
|
|
/* per-net private data for this module */
|
static unsigned int pppoe_net_id __read_mostly;
|
struct pppoe_net {
|
/*
|
* we could use _single_ hash table for all
|
* nets by injecting net id into the hash but
|
* it would increase hash chains and add
|
* a few additional math comparations messy
|
* as well, moreover in case of SMP less locking
|
* controversy here
|
*/
|
struct pppox_sock *hash_table[PPPOE_HASH_SIZE];
|
rwlock_t hash_lock;
|
};
|
|
/*
|
* PPPoE could be in the following stages:
|
* 1) Discovery stage (to obtain remote MAC and Session ID)
|
* 2) Session stage (MAC and SID are known)
|
*
|
* Ethernet frames have a special tag for this but
|
* we use simpler approach based on session id
|
*/
|
static inline bool stage_session(__be16 sid)
|
{
|
return sid != 0;
|
}
|
|
static inline struct pppoe_net *pppoe_pernet(struct net *net)
|
{
|
BUG_ON(!net);
|
|
return net_generic(net, pppoe_net_id);
|
}
|
|
static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b)
|
{
|
return a->sid == b->sid && ether_addr_equal(a->remote, b->remote);
|
}
|
|
static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr)
|
{
|
return a->sid == sid && ether_addr_equal(a->remote, addr);
|
}
|
|
#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_MASK;
|
}
|
|
/**********************************************************************
|
*
|
* Set/get/delete/rehash items (internal versions)
|
*
|
**********************************************************************/
|
static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid,
|
unsigned char *addr, int ifindex)
|
{
|
int hash = hash_item(sid, addr);
|
struct pppox_sock *ret;
|
|
ret = pn->hash_table[hash];
|
while (ret) {
|
if (cmp_addr(&ret->pppoe_pa, sid, addr) &&
|
ret->pppoe_ifindex == ifindex)
|
return ret;
|
|
ret = ret->next;
|
}
|
|
return NULL;
|
}
|
|
static int __set_item(struct pppoe_net *pn, struct pppox_sock *po)
|
{
|
int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
|
struct pppox_sock *ret;
|
|
ret = pn->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 = pn->hash_table[hash];
|
pn->hash_table[hash] = po;
|
|
return 0;
|
}
|
|
static void __delete_item(struct pppoe_net *pn, __be16 sid,
|
char *addr, int ifindex)
|
{
|
int hash = hash_item(sid, addr);
|
struct pppox_sock *ret, **src;
|
|
ret = pn->hash_table[hash];
|
src = &pn->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;
|
}
|
}
|
|
/**********************************************************************
|
*
|
* Set/get/delete/rehash items
|
*
|
**********************************************************************/
|
static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid,
|
unsigned char *addr, int ifindex)
|
{
|
struct pppox_sock *po;
|
|
read_lock_bh(&pn->hash_lock);
|
po = __get_item(pn, sid, addr, ifindex);
|
if (po)
|
sock_hold(sk_pppox(po));
|
read_unlock_bh(&pn->hash_lock);
|
|
return po;
|
}
|
|
static inline struct pppox_sock *get_item_by_addr(struct net *net,
|
struct sockaddr_pppox *sp)
|
{
|
struct net_device *dev;
|
struct pppoe_net *pn;
|
struct pppox_sock *pppox_sock = NULL;
|
|
int ifindex;
|
|
rcu_read_lock();
|
dev = dev_get_by_name_rcu(net, sp->sa_addr.pppoe.dev);
|
if (dev) {
|
ifindex = dev->ifindex;
|
pn = pppoe_pernet(net);
|
pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid,
|
sp->sa_addr.pppoe.remote, ifindex);
|
}
|
rcu_read_unlock();
|
return pppox_sock;
|
}
|
|
static inline void delete_item(struct pppoe_net *pn, __be16 sid,
|
char *addr, int ifindex)
|
{
|
write_lock_bh(&pn->hash_lock);
|
__delete_item(pn, sid, addr, ifindex);
|
write_unlock_bh(&pn->hash_lock);
|
}
|
|
/***************************************************************************
|
*
|
* Handler for device events.
|
* Certain device events require that sockets be unconnected.
|
*
|
**************************************************************************/
|
|
static void pppoe_flush_dev(struct net_device *dev)
|
{
|
struct pppoe_net *pn;
|
int i;
|
|
pn = pppoe_pernet(dev_net(dev));
|
write_lock_bh(&pn->hash_lock);
|
for (i = 0; i < PPPOE_HASH_SIZE; i++) {
|
struct pppox_sock *po = pn->hash_table[i];
|
struct sock *sk;
|
|
while (po) {
|
while (po && po->pppoe_dev != dev) {
|
po = po->next;
|
}
|
|
if (!po)
|
break;
|
|
sk = sk_pppox(po);
|
|
/* We always grab the socket lock, followed by the
|
* 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(&pn->hash_lock);
|
lock_sock(sk);
|
|
if (po->pppoe_dev == dev &&
|
sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) {
|
pppox_unbind_sock(sk);
|
sk->sk_state_change(sk);
|
po->pppoe_dev = NULL;
|
dev_put(dev);
|
}
|
|
release_sock(sk);
|
sock_put(sk);
|
|
/* Restart the process from the start of the current
|
* hash chain. We dropped locks so the world may have
|
* change from underneath us.
|
*/
|
|
BUG_ON(pppoe_pernet(dev_net(dev)) == NULL);
|
write_lock_bh(&pn->hash_lock);
|
po = pn->hash_table[i];
|
}
|
}
|
write_unlock_bh(&pn->hash_lock);
|
}
|
|
static int pppoe_device_event(struct notifier_block *this,
|
unsigned long event, void *ptr)
|
{
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
/* Only look at sockets that are using this specific device. */
|
switch (event) {
|
case NETDEV_CHANGEADDR:
|
case NETDEV_CHANGEMTU:
|
/* A change in mtu or address 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;
|
|
/* Backlog receive. Semantics of backlog rcv preclude any code from
|
* executing in lock_sock()/release_sock() bounds; meaning sk->sk_state
|
* can't change.
|
*/
|
|
if (skb->pkt_type == PACKET_OTHERHOST)
|
goto abort_kfree;
|
|
if (sk->sk_state & PPPOX_BOUND) {
|
ppp_input(&po->chan, skb);
|
} else if (sk->sk_state & PPPOX_RELAY) {
|
relay_po = get_item_by_addr(sock_net(sk),
|
&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;
|
|
sock_put(sk_pppox(relay_po));
|
} 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;
|
struct pppoe_net *pn;
|
int len;
|
|
skb = skb_share_check(skb, GFP_ATOMIC);
|
if (!skb)
|
goto out;
|
|
if (skb_mac_header_len(skb) < ETH_HLEN)
|
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;
|
|
if (pskb_trim_rcsum(skb, len))
|
goto drop;
|
|
ph = pppoe_hdr(skb);
|
pn = pppoe_pernet(dev_net(dev));
|
|
/* Note that get_item does a sock_hold(), so sk_pppox(po)
|
* is known to be safe.
|
*/
|
po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
|
if (!po)
|
goto drop;
|
|
return sk_receive_skb(sk_pppox(po), skb, 0);
|
|
drop:
|
kfree_skb(skb);
|
out:
|
return NET_RX_DROP;
|
}
|
|
static void pppoe_unbind_sock_work(struct work_struct *work)
|
{
|
struct pppox_sock *po = container_of(work, struct pppox_sock,
|
proto.pppoe.padt_work);
|
struct sock *sk = sk_pppox(po);
|
|
lock_sock(sk);
|
if (po->pppoe_dev) {
|
dev_put(po->pppoe_dev);
|
po->pppoe_dev = NULL;
|
}
|
pppox_unbind_sock(sk);
|
release_sock(sk);
|
sock_put(sk);
|
}
|
|
/************************************************************************
|
*
|
* 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;
|
struct pppoe_net *pn;
|
|
skb = skb_share_check(skb, GFP_ATOMIC);
|
if (!skb)
|
goto out;
|
|
if (skb->pkt_type != PACKET_HOST)
|
goto abort;
|
|
if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
|
goto abort;
|
|
ph = pppoe_hdr(skb);
|
if (ph->code != PADT_CODE)
|
goto abort;
|
|
pn = pppoe_pernet(dev_net(dev));
|
po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex);
|
if (po)
|
if (!schedule_work(&po->proto.pppoe.padt_work))
|
sock_put(sk_pppox(po));
|
|
abort:
|
kfree_skb(skb);
|
out:
|
return NET_RX_SUCCESS; /* Lies... :-) */
|
}
|
|
static struct packet_type pppoes_ptype __read_mostly = {
|
.type = cpu_to_be16(ETH_P_PPP_SES),
|
.func = pppoe_rcv,
|
};
|
|
static struct packet_type pppoed_ptype __read_mostly = {
|
.type = cpu_to_be16(ETH_P_PPP_DISC),
|
.func = pppoe_disc_rcv,
|
};
|
|
static struct proto pppoe_sk_proto __read_mostly = {
|
.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 kern)
|
{
|
struct sock *sk;
|
|
sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto, kern);
|
if (!sk)
|
return -ENOMEM;
|
|
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;
|
|
INIT_WORK(&pppox_sk(sk)->proto.pppoe.padt_work,
|
pppoe_unbind_sock_work);
|
|
return 0;
|
}
|
|
static int pppoe_release(struct socket *sock)
|
{
|
struct sock *sk = sock->sk;
|
struct pppox_sock *po;
|
struct pppoe_net *pn;
|
struct net *net = NULL;
|
|
if (!sk)
|
return 0;
|
|
lock_sock(sk);
|
if (sock_flag(sk, SOCK_DEAD)) {
|
release_sock(sk);
|
return -EBADF;
|
}
|
|
po = pppox_sk(sk);
|
|
if (po->pppoe_dev) {
|
dev_put(po->pppoe_dev);
|
po->pppoe_dev = NULL;
|
}
|
|
pppox_unbind_sock(sk);
|
|
/* Signal the death of the socket. */
|
sk->sk_state = PPPOX_DEAD;
|
|
net = sock_net(sk);
|
pn = pppoe_pernet(net);
|
|
/*
|
* protect "po" from concurrent updates
|
* on pppoe_flush_dev
|
*/
|
delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote,
|
po->pppoe_ifindex);
|
|
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 sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr;
|
struct pppox_sock *po = pppox_sk(sk);
|
struct net_device *dev = NULL;
|
struct pppoe_net *pn;
|
struct net *net = NULL;
|
int error;
|
|
lock_sock(sk);
|
|
error = -EINVAL;
|
|
if (sockaddr_len != sizeof(struct sockaddr_pppox))
|
goto end;
|
|
if (sp->sa_protocol != PX_PROTO_OE)
|
goto end;
|
|
/* Check for already bound sockets */
|
error = -EBUSY;
|
if ((sk->sk_state & PPPOX_CONNECTED) &&
|
stage_session(sp->sa_addr.pppoe.sid))
|
goto end;
|
|
/* Check for already disconnected sockets, on attempts to disconnect */
|
error = -EALREADY;
|
if ((sk->sk_state & PPPOX_DEAD) &&
|
!stage_session(sp->sa_addr.pppoe.sid))
|
goto end;
|
|
error = 0;
|
|
/* Delete the old binding */
|
if (stage_session(po->pppoe_pa.sid)) {
|
pppox_unbind_sock(sk);
|
pn = pppoe_pernet(sock_net(sk));
|
delete_item(pn, po->pppoe_pa.sid,
|
po->pppoe_pa.remote, po->pppoe_ifindex);
|
if (po->pppoe_dev) {
|
dev_put(po->pppoe_dev);
|
po->pppoe_dev = NULL;
|
}
|
|
po->pppoe_ifindex = 0;
|
memset(&po->pppoe_pa, 0, sizeof(po->pppoe_pa));
|
memset(&po->pppoe_relay, 0, sizeof(po->pppoe_relay));
|
memset(&po->chan, 0, sizeof(po->chan));
|
po->next = NULL;
|
po->num = 0;
|
|
sk->sk_state = PPPOX_NONE;
|
}
|
|
/* Re-bind in session stage only */
|
if (stage_session(sp->sa_addr.pppoe.sid)) {
|
error = -ENODEV;
|
net = sock_net(sk);
|
dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
|
if (!dev)
|
goto err_put;
|
|
po->pppoe_dev = dev;
|
po->pppoe_ifindex = dev->ifindex;
|
pn = pppoe_pernet(net);
|
if (!(dev->flags & IFF_UP)) {
|
goto err_put;
|
}
|
|
memcpy(&po->pppoe_pa,
|
&sp->sa_addr.pppoe,
|
sizeof(struct pppoe_addr));
|
|
write_lock_bh(&pn->hash_lock);
|
error = __set_item(pn, po);
|
write_unlock_bh(&pn->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) - 2;
|
po->chan.private = sk;
|
po->chan.ops = &pppoe_chan_ops;
|
|
error = ppp_register_net_channel(dev_net(dev), &po->chan);
|
if (error) {
|
delete_item(pn, po->pppoe_pa.sid,
|
po->pppoe_pa.remote, po->pppoe_ifindex);
|
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 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);
|
|
return len;
|
}
|
|
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_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(sock_net(sk), &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 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;
|
int hlen;
|
|
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;
|
|
hlen = LL_RESERVED_SPACE(dev);
|
skb = sock_wmalloc(sk, hlen + sizeof(*ph) + total_len +
|
dev->needed_tailroom, 0, GFP_KERNEL);
|
if (!skb) {
|
error = -ENOMEM;
|
goto end;
|
}
|
|
/* Reserve space for headers. */
|
skb_reserve(skb, hlen);
|
skb_reset_network_header(skb);
|
|
skb->dev = dev;
|
|
skb->priority = sk->sk_priority;
|
skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
|
|
ph = skb_put(skb, total_len + sizeof(struct pppoe_hdr));
|
start = (char *)&ph->tag[0];
|
|
error = memcpy_from_msg(start, m, 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;
|
|
/* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP
|
* xmit operations conclude prior to an unregistration call. Thus
|
* sk->sk_state cannot change, so we don't need to do lock_sock().
|
* But, we also can't do a lock_sock since that introduces a potential
|
* deadlock as we'd reverse the lock ordering used when calling
|
* ppp_unregister_channel().
|
*/
|
|
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, LL_RESERVED_SPACE(dev) + sizeof(*ph)))
|
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 = cpu_to_be16(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 const struct ppp_channel_ops pppoe_chan_ops = {
|
.start_xmit = pppoe_xmit,
|
};
|
|
static int pppoe_recvmsg(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;
|
|
if (skb) {
|
total_len = min_t(size_t, total_len, skb->len);
|
error = skb_copy_datagram_msg(skb, 0, m, total_len);
|
if (error == 0) {
|
consume_skb(skb);
|
return 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;
|
|
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 %pM %8s\n",
|
po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name);
|
out:
|
return 0;
|
}
|
|
static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos)
|
{
|
struct pppox_sock *po;
|
int i;
|
|
for (i = 0; i < PPPOE_HASH_SIZE; i++) {
|
po = pn->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(pn->hash_lock)
|
{
|
struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
|
loff_t l = *pos;
|
|
read_lock_bh(&pn->hash_lock);
|
return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN;
|
}
|
|
static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
{
|
struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
|
struct pppox_sock *po;
|
|
++*pos;
|
if (v == SEQ_START_TOKEN) {
|
po = pppoe_get_idx(pn, 0);
|
goto out;
|
}
|
po = v;
|
if (po->next)
|
po = po->next;
|
else {
|
int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote);
|
|
po = NULL;
|
while (++hash < PPPOE_HASH_SIZE) {
|
po = pn->hash_table[hash];
|
if (po)
|
break;
|
}
|
}
|
|
out:
|
return po;
|
}
|
|
static void pppoe_seq_stop(struct seq_file *seq, void *v)
|
__releases(pn->hash_lock)
|
{
|
struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq));
|
read_unlock_bh(&pn->hash_lock);
|
}
|
|
static const struct seq_operations pppoe_seq_ops = {
|
.start = pppoe_seq_start,
|
.next = pppoe_seq_next,
|
.stop = pppoe_seq_stop,
|
.show = pppoe_seq_show,
|
};
|
#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,
|
#ifdef CONFIG_COMPAT
|
.compat_ioctl = pppox_compat_ioctl,
|
#endif
|
};
|
|
static const struct pppox_proto pppoe_proto = {
|
.create = pppoe_create,
|
.ioctl = pppoe_ioctl,
|
.owner = THIS_MODULE,
|
};
|
|
static __net_init int pppoe_init_net(struct net *net)
|
{
|
struct pppoe_net *pn = pppoe_pernet(net);
|
struct proc_dir_entry *pde;
|
|
rwlock_init(&pn->hash_lock);
|
|
pde = proc_create_net("pppoe", 0444, net->proc_net,
|
&pppoe_seq_ops, sizeof(struct seq_net_private));
|
#ifdef CONFIG_PROC_FS
|
if (!pde)
|
return -ENOMEM;
|
#endif
|
|
return 0;
|
}
|
|
static __net_exit void pppoe_exit_net(struct net *net)
|
{
|
remove_proc_entry("pppoe", net->proc_net);
|
}
|
|
static struct pernet_operations pppoe_net_ops = {
|
.init = pppoe_init_net,
|
.exit = pppoe_exit_net,
|
.id = &pppoe_net_id,
|
.size = sizeof(struct pppoe_net),
|
};
|
|
static int __init pppoe_init(void)
|
{
|
int err;
|
|
err = register_pernet_device(&pppoe_net_ops);
|
if (err)
|
goto out;
|
|
err = proto_register(&pppoe_sk_proto, 0);
|
if (err)
|
goto out_unregister_net_ops;
|
|
err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto);
|
if (err)
|
goto out_unregister_pppoe_proto;
|
|
dev_add_pack(&pppoes_ptype);
|
dev_add_pack(&pppoed_ptype);
|
register_netdevice_notifier(&pppoe_notifier);
|
|
return 0;
|
|
out_unregister_pppoe_proto:
|
proto_unregister(&pppoe_sk_proto);
|
out_unregister_net_ops:
|
unregister_pernet_device(&pppoe_net_ops);
|
out:
|
return err;
|
}
|
|
static void __exit pppoe_exit(void)
|
{
|
unregister_netdevice_notifier(&pppoe_notifier);
|
dev_remove_pack(&pppoed_ptype);
|
dev_remove_pack(&pppoes_ptype);
|
unregister_pppox_proto(PX_PROTO_OE);
|
proto_unregister(&pppoe_sk_proto);
|
unregister_pernet_device(&pppoe_net_ops);
|
}
|
|
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_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OE);
|
