netdev - [PATCH net 2/2] udp6: add missing rehash callback to udplite

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Message-Id: <1547655465-16133-2-git-send-email-alexey.kodanev@oracle.com>
Date:   Wed, 16 Jan 2019 19:17:45 +0300
From:   Alexey Kodanev <alexey.kodanev@...cle.com>
To:     netdev@...r.kernel.org
Cc:     Peter Oskolkov <posk@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>,
        Alexey Kodanev <alexey.kodanev@...cle.com>
Subject: [PATCH net 2/2] 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.

Signed-off-by: Alexey Kodanev <alexey.kodanev@...cle.com>
---
 net/ipv6/udp.c      | 2 +-
 net/ipv6/udp_impl.h | 1 +
 net/ipv6/udplite.c  | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 7c35050..c9144bc 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 5730e65..20e324b 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 a125aeb..f359078 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,
-- 
1.8.3.1