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udp: fix l4 hash after reconnect

Browse source 
After the blamed commit below, udp_rehash() is supposed to be called
with both local and remote addresses set.

Currently that is already the case for IPv6 sockets, but for IPv4 the
destination address is updated after rehashing.

Address the issue moving the destination address and port initialization
before rehashing.

Fixes: 1b29a730ef ("ipv6/udp: Add 4-tuple hash for connected socket")
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/4761e466ab9f7542c68cdc95f248987d127044d2.1733499715.git.pabeni@redhat.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Paolo Abeni 2024-12-06 16:49:14 +01:00
parent 00301ef4b2
commit 51a00be6a0
1 changed files with 5 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
net/ipv4/datagram.c
View file

@ -61,15 +61,17 @@ int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len
err = -EACCES;
goto out;
}
/* Update addresses before rehashing */
inet->inet_daddr = fl4->daddr;
inet->inet_dport = usin->sin_port;
if (!inet->inet_saddr)
inet->inet_saddr = fl4->saddr; /* Update source address */
inet->inet_saddr = fl4->saddr;
if (!inet->inet_rcv_saddr) {
inet->inet_rcv_saddr = fl4->saddr;
if (sk->sk_prot->rehash)
sk->sk_prot->rehash(sk);
}
inet->inet_daddr = fl4->daddr;
inet->inet_dport = usin->sin_port;
reuseport_has_conns_set(sk);
sk->sk_state = TCP_ESTABLISHED;
sk_set_txhash(sk);