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path: root/net/ipv4/inet_timewait_sock.c
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Diffstat (limited to 'net/ipv4/inet_timewait_sock.c')
-rw-r--r--net/ipv4/inet_timewait_sock.c26
1 files changed, 15 insertions, 11 deletions
diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index 1c5fd38f882..60689951ecd 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -23,12 +23,12 @@ static void __inet_twsk_kill(struct inet_timewait_sock *tw,
rwlock_t *lock = inet_ehash_lockp(hashinfo, tw->tw_hash);
write_lock(lock);
- if (hlist_unhashed(&tw->tw_node)) {
+ if (hlist_nulls_unhashed(&tw->tw_node)) {
write_unlock(lock);
return;
}
- __hlist_del(&tw->tw_node);
- sk_node_init(&tw->tw_node);
+ hlist_nulls_del_rcu(&tw->tw_node);
+ sk_nulls_node_init(&tw->tw_node);
write_unlock(lock);
/* Disassociate with bind bucket. */
@@ -92,13 +92,17 @@ void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
write_lock(lock);
- /* Step 2: Remove SK from established hash. */
- if (__sk_del_node_init(sk))
- sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
-
- /* Step 3: Hash TW into TIMEWAIT chain. */
- inet_twsk_add_node(tw, &ehead->twchain);
+ /*
+ * Step 2: Hash TW into TIMEWAIT chain.
+ * Should be done before removing sk from established chain
+ * because readers are lockless and search established first.
+ */
atomic_inc(&tw->tw_refcnt);
+ inet_twsk_add_node_rcu(tw, &ehead->twchain);
+
+ /* Step 3: Remove SK from established hash. */
+ if (__sk_nulls_del_node_init_rcu(sk))
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
write_unlock(lock);
}
@@ -416,7 +420,7 @@ void inet_twsk_purge(struct net *net, struct inet_hashinfo *hashinfo,
{
struct inet_timewait_sock *tw;
struct sock *sk;
- struct hlist_node *node;
+ struct hlist_nulls_node *node;
int h;
local_bh_disable();
@@ -426,7 +430,7 @@ void inet_twsk_purge(struct net *net, struct inet_hashinfo *hashinfo,
rwlock_t *lock = inet_ehash_lockp(hashinfo, h);
restart:
write_lock(lock);
- sk_for_each(sk, node, &head->twchain) {
+ sk_nulls_for_each(sk, node, &head->twchain) {
tw = inet_twsk(sk);
if (!net_eq(twsk_net(tw), net) ||