static int packet_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct sock **skp;
if (!sk)
return 0;
write_lock_bh(&packet_sklist_lock);
for (skp = &packet_sklist; *skp; skp = &(*skp)->next) {
if (*skp == sk) {
*skp = sk->next;
__sock_put(sk);
break;
}
}
write_unlock_bh(&packet_sklist_lock);
/*
* Unhook packet receive handler.
*/
if (sk->protinfo.af_packet->running) {
/*
* Remove the protocol hook
*/
dev_remove_pack(&sk->protinfo.af_packet->prot_hook);
sk->protinfo.af_packet->running = 0;
__sock_put(sk);
}
#ifdef CONFIG_PACKET_MULTICAST
packet_flush_mclist(sk);
#endif
#ifdef CONFIG_PACKET_MMAP
if (sk->protinfo.af_packet->pg_vec) {
struct tpacket_req req;
memset(&req, 0, sizeof(req));
packet_set_ring(sk, &req, 1);
}
#endif
/*
* Now the socket is dead. No more input will appear.
*/
sock_orphan(sk);
sock->sk = NULL;
/* Purge queues */
skb_queue_purge(&sk->receive_queue);
sock_put(sk);
return 0;
}
static int packet_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct packet_sock *po;
if (!sk)
return 0;
po = pkt_sk(sk);
write_lock_bh(&packet_sklist_lock);
sk_del_node_init(sk);
write_unlock_bh(&packet_sklist_lock);
/*
* Unhook packet receive handler.
*/
if (po->running) {
/*
* Remove the protocol hook
*/
dev_remove_pack(&po->prot_hook);
po->running = 0;
po->num = 0;
__sock_put(sk);
}
#ifdef CONFIG_PACKET_MULTICAST
packet_flush_mclist(sk);
#endif
#ifdef CONFIG_PACKET_MMAP
if (po->pg_vec) {
struct tpacket_req req;
memset(&req, 0, sizeof(req));
packet_set_ring(sk, &req, 1);
}
#endif
/*
* Now the socket is dead. No more input will appear.
*/
sock_orphan(sk);
sock->sk = NULL;
/* Purge queues */
skb_queue_purge(&sk->sk_receive_queue);
sock_put(sk);
return 0;
}
static int
packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
{
struct sock *sk = sock->sk;
int ret;
if (level != SOL_PACKET)
return -ENOPROTOOPT;
switch(optname) {
#ifdef CONFIG_PACKET_MULTICAST
case PACKET_ADD_MEMBERSHIP:
case PACKET_DROP_MEMBERSHIP:
{
struct packet_mreq mreq;
if (optlen<sizeof(mreq))
return -EINVAL;
if (copy_from_user(&mreq,optval,sizeof(mreq)))
return -EFAULT;
if (optname == PACKET_ADD_MEMBERSHIP)
ret = packet_mc_add(sk, &mreq);
else
ret = packet_mc_drop(sk, &mreq);
return ret;
}
#endif
#ifdef CONFIG_PACKET_MMAP
case PACKET_RX_RING:
{
struct tpacket_req req;
if (optlen<sizeof(req))
return -EINVAL;
if (copy_from_user(&req,optval,sizeof(req)))
return -EFAULT;
return packet_set_ring(sk, &req, 0);
}
case PACKET_COPY_THRESH:
{
int val;
if (optlen!=sizeof(val))
return -EINVAL;
if (copy_from_user(&val,optval,sizeof(val)))
return -EFAULT;
pkt_sk(sk)->copy_thresh = val;
return 0;
}
#endif
default:
return -ENOPROTOOPT;
}
}