netdev - [PATCH net] udp: rehash on disconnect

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Message-Id: <20200219191632.253526-1-willemdebruijn.kernel@gmail.com>
Date:   Wed, 19 Feb 2020 14:16:32 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, plroskin@...il.com, edumazet@...gle.com,
        Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH net] udp: rehash on disconnect

From: Willem de Bruijn <willemb@...gle.com>

As of the below commit, udp sockets bound to a specific address can
coexist with one bound to the any addr for the same port.

The commit also phased out the use of socket hashing based only on
port (hslot), in favor of always hashing on {addr, port} (hslot2).

The change broke the following behavior with disconnect (AF_UNSPEC):

    server binds to 0.0.0.0:1337
    server connects to 127.0.0.1:80
    server disconnects
    client connects to 127.0.0.1:1337
    client sends "hello"
    server reads "hello"	// times out, packet did not find sk

On connect the server acquires a specific source addr suitable for
routing to its destination. On disconnect it reverts to the any addr.

The connect call triggers a rehash to a different hslot2. On
disconnect, add the same to return to the original hslot2.

Skip this step if the socket is going to be unhashed completely.

Fixes: 4cdeeee9252a ("net: udp: prefer listeners bound to an address")
Reported-by: Pavel Roskin <plroskin@...il.com>
Signed-off-by: Willem de Bruijn <willemb@...gle.com>
---
 net/ipv4/udp.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index db76b96092991..08a41f1e1cd22 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1857,8 +1857,12 @@ int __udp_disconnect(struct sock *sk, int flags)
 	inet->inet_dport = 0;
 	sock_rps_reset_rxhash(sk);
 	sk->sk_bound_dev_if = 0;
-	if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
+	if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) {
 		inet_reset_saddr(sk);
+		if (sk->sk_prot->rehash &&
+		    (sk->sk_userlocks & SOCK_BINDPORT_LOCK))
+			sk->sk_prot->rehash(sk);
+	}
 
 	if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) {
 		sk->sk_prot->unhash(sk);
-- 
2.25.0.265.gbab2e86ba0-goog