On Thu, Apr 15, 2010 at 11:05 PM, Patrick McHardy <kaber@xxxxxxxxx> wrote:
>
> No its not:
>
> static void nfnetlink_rcv(struct sk_buff *skb)
> {
> nfnl_lock();
> netlink_rcv_skb(skb, &nfnetlink_rcv_msg);
> nfnl_unlock();
> }
>
>
static int
nfqnl_rcv_nl_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct netlink_notify *n = ptr;
if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
int i;
/* destroy all instances for this pid */
spin_lock(&instances_lock);
for (i = 0; i < INSTANCE_BUCKETS; i++) {
struct hlist_node *tmp, *t2;
struct nfqnl_instance *inst;
struct hlist_head *head = &instance_table[i];
hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
if ((n->net == &init_net) &&
(n->pid == inst->peer_pid))
__instance_destroy(inst);
}
}
spin_unlock(&instances_lock);
}
return NOTIFY_DONE;
}
static struct notifier_block nfqnl_rtnl_notifier = {
.notifier_call = nfqnl_rcv_nl_event,
};
...
netlink_register_notifier(&nfqnl_rtnl_notifier);
...
int netlink_register_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_register(&netlink_chain, nb);
}
...
static int netlink_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct netlink_sock *nlk;
if (!sk)
return 0;
netlink_remove(sk);
sock_orphan(sk);
nlk = nlk_sk(sk);
/*
* OK. Socket is unlinked, any packets that arrive now
* will be purged.
*/
sock->sk = NULL;
wake_up_interruptible_all(&nlk->wait);
skb_queue_purge(&sk->sk_write_queue);
if (nlk->pid) {
struct netlink_notify n = {
.net = sock_net(sk),
.protocol = sk->sk_protocol,
.pid = nlk->pid,
};
atomic_notifier_call_chain(&netlink_chain,
NETLINK_URELEASE, &n);
}
--
Regards，
Changli Gao(xiaosuo@xxxxxxxxx)
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