udp6: add missing rehash callback to udplite

After commit 23b0269e58ae ("net: udp6: prefer listeners bound to an
address"), UDP-Lite only works when specifying a local address for
the sockets.

This is related to the problem addressed in the commit 719f835853a9
("udp: add rehash on connect()"). Moreover, __udp6_lib_lookup() now
looks for a socket immediately in the secondary hash table.

And this issue was found with LTP/network tests as well.

Fixes: 23b0269e58ae ("net: udp6: prefer listeners bound to an address")
Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 3 insertions, 1 deletions

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index e1f2b9660666..2596ffdeebea 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -102,7 +102,7 @@ int udp_v6_get_port(struct sock *sk, unsigned short snum)
         return udp_lib_get_port(sk, snum, hash2_nulladdr);
 }
 
-static void udp_v6_rehash(struct sock *sk)
+void udp_v6_rehash(struct sock *sk)
 {
         u16 new_hash = ipv6_portaddr_hash(sock_net(sk),
                                           &sk->sk_v6_rcv_saddr,
diff --git a/net/ipv6/udp_impl.h b/net/ipv6/udp_impl.h
index 5730e6503cb4..20e324b6f358 100644
--- a/net/ipv6/udp_impl.h
+++ b/net/ipv6/udp_impl.h
@@ -13,6 +13,7 @@ int __udp6_lib_err(struct sk_buff *, struct inet6_skb_parm *, u8, u8, int,
                    __be32, struct udp_table *);
 
 int udp_v6_get_port(struct sock *sk, unsigned short snum);
+void udp_v6_rehash(struct sock *sk);
 
 int udpv6_getsockopt(struct sock *sk, int level, int optname,
                      char __user *optval, int __user *optlen);
diff --git a/net/ipv6/udplite.c b/net/ipv6/udplite.c
index a125aebc29e5..f35907836444 100644
--- a/net/ipv6/udplite.c
+++ b/net/ipv6/udplite.c
@@ -49,6 +49,7 @@ struct proto udplitev6_prot = {
         .recvmsg           = udpv6_recvmsg,
         .hash              = udp_lib_hash,
         .unhash            = udp_lib_unhash,
+        .rehash            = udp_v6_rehash,
         .get_port          = udp_v6_get_port,
         .memory_allocated  = &udp_memory_allocated,
         .sysctl_mem        = sysctl_udp_mem,