tcp: send_reset: test for non-NULL sk first

tcp_md5_do_lookup requires a full socket, so once we extend
_send_reset() to also accept timewait socket we would have to change

if (!sk && hash_location)

to something like

if ((!sk || !sk_fullsock(sk)) && hash_location) {
  ...
} else {
  (sk && sk_fullsock(sk)) tcp_md5_do_lookup()
}

Switch the two branches: check if we have a socket first, then
fall back to a listener lookup if we saw a md5 option (hash_location).

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 46e92fb..eb29c2f 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -587,7 +587,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
        } rep;
        struct ip_reply_arg arg;
 #ifdef CONFIG_TCP_MD5SIG
-       struct tcp_md5sig_key *key;
+       struct tcp_md5sig_key *key = NULL;
        const __u8 *hash_location = NULL;
        unsigned char newhash[16];
        int genhash;
@@ -627,7 +627,10 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
        net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
 #ifdef CONFIG_TCP_MD5SIG
        hash_location = tcp_parse_md5sig_option(th);
-       if (!sk && hash_location) {
+       if (sk) {
+               key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)
+                                       &ip_hdr(skb)->saddr, AF_INET);
+       } else if (hash_location) {
                /*
                 * active side is lost. Try to find listening socket through
                 * source port, and then find md5 key through listening socket.
@@ -651,10 +654,6 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
                genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, skb);
                if (genhash || memcmp(hash_location, newhash, 16) != 0)
                        goto release_sk1;
-       } else {
-               key = sk ? tcp_md5_do_lookup(sk, (union tcp_md5_addr *)
-                                            &ip_hdr(skb)->saddr,
-                                            AF_INET) : NULL;
        }
 
        if (key) {

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index f03d2b0..32fa0de 100644 (file)
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -854,7 +854,9 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
 
 #ifdef CONFIG_TCP_MD5SIG
        hash_location = tcp_parse_md5sig_option(th);
-       if (!sk && hash_location) {
+       if (sk) {
+               key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr);
+       } else if (hash_location) {
                /*
                 * active side is lost. Try to find listening socket through
                 * source port, and then find md5 key through listening socket.
@@ -877,8 +879,6 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
                genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb);
                if (genhash || memcmp(hash_location, newhash, 16) != 0)
                        goto release_sk1;
-       } else {
-               key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL;
        }
 #endif