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Diffstat (limited to 'net/ipv4/inet_hashtables.c')
-rw-r--r--net/ipv4/inet_hashtables.c45
1 files changed, 39 insertions, 6 deletions
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index d745f962745e..18ef370af113 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -858,14 +858,34 @@ inet_bhash2_addr_any_hashbucket(const struct sock *sk, const struct net *net, in
return &hinfo->bhash2[hash & (hinfo->bhash_size - 1)];
}
-int inet_bhash2_update_saddr(struct inet_bind_hashbucket *prev_saddr, struct sock *sk)
+static void inet_update_saddr(struct sock *sk, void *saddr, int family)
+{
+ if (family == AF_INET) {
+ inet_sk(sk)->inet_saddr = *(__be32 *)saddr;
+ sk_rcv_saddr_set(sk, inet_sk(sk)->inet_saddr);
+ }
+#if IS_ENABLED(CONFIG_IPV6)
+ else {
+ sk->sk_v6_rcv_saddr = *(struct in6_addr *)saddr;
+ }
+#endif
+}
+
+int inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family)
{
struct inet_hashinfo *hinfo = tcp_or_dccp_get_hashinfo(sk);
+ struct inet_bind_hashbucket *head, *head2;
struct inet_bind2_bucket *tb2, *new_tb2;
int l3mdev = inet_sk_bound_l3mdev(sk);
- struct inet_bind_hashbucket *head2;
int port = inet_sk(sk)->inet_num;
struct net *net = sock_net(sk);
+ int bhash;
+
+ if (!inet_csk(sk)->icsk_bind2_hash) {
+ /* Not bind()ed before. */
+ inet_update_saddr(sk, saddr, family);
+ return 0;
+ }
/* Allocate a bind2 bucket ahead of time to avoid permanently putting
* the bhash2 table in an inconsistent state if a new tb2 bucket
@@ -875,14 +895,25 @@ int inet_bhash2_update_saddr(struct inet_bind_hashbucket *prev_saddr, struct soc
if (!new_tb2)
return -ENOMEM;
+ bhash = inet_bhashfn(net, port, hinfo->bhash_size);
+ head = &hinfo->bhash[bhash];
head2 = inet_bhashfn_portaddr(hinfo, sk, net, port);
- spin_lock_bh(&prev_saddr->lock);
+ /* If we change saddr locklessly, another thread
+ * iterating over bhash might see corrupted address.
+ */
+ spin_lock_bh(&head->lock);
+
+ spin_lock(&head2->lock);
__sk_del_bind2_node(sk);
inet_bind2_bucket_destroy(hinfo->bind2_bucket_cachep, inet_csk(sk)->icsk_bind2_hash);
- spin_unlock_bh(&prev_saddr->lock);
+ spin_unlock(&head2->lock);
+
+ inet_update_saddr(sk, saddr, family);
- spin_lock_bh(&head2->lock);
+ head2 = inet_bhashfn_portaddr(hinfo, sk, net, port);
+
+ spin_lock(&head2->lock);
tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, sk);
if (!tb2) {
tb2 = new_tb2;
@@ -890,7 +921,9 @@ int inet_bhash2_update_saddr(struct inet_bind_hashbucket *prev_saddr, struct soc
}
sk_add_bind2_node(sk, &tb2->owners);
inet_csk(sk)->icsk_bind2_hash = tb2;
- spin_unlock_bh(&head2->lock);
+ spin_unlock(&head2->lock);
+
+ spin_unlock_bh(&head->lock);
if (tb2 != new_tb2)
kmem_cache_free(hinfo->bind2_bucket_cachep, new_tb2);