linux-kernel - [PATCH net v3] udp: preserve the connected status if only UDP cmsg

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Date: Fri, 19 Apr 2024 01:06:10 +0800
From: Yick Xie <yick.xie@...il.com>
To: willemdebruijn.kernel@...il.com,
	willemb@...gle.com
Cc: netdev@...r.kernel.org,
	davem@...emloft.net,
	dsahern@...nel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH net v3] udp: preserve the connected status if only UDP cmsg

If "udp_cmsg_send()" returned 0 (i.e. only UDP cmsg),
"connected" should not be set to 0. Otherwise it stops
the connected socket from using the cached route.

Fixes: 2e8de8576343 ("udp: add gso segment cmsg")
Signed-off-by: Yick Xie <yick.xie@...il.com>
Cc: stable@...r.kernel.org
---
v3: Fix the IPV6 counterpart and revise the subject
v2: Add Fixes tag
v1: https://lore.kernel.org/netdev/20240414195213.106209-1-yick.xie@gmail.com/
---
 net/ipv4/udp.c | 5 +++--
 net/ipv6/udp.c | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index c02bf011d4a6..420905be5f30 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1123,16 +1123,17 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 
 	if (msg->msg_controllen) {
 		err = udp_cmsg_send(sk, msg, &ipc.gso_size);
-		if (err > 0)
+		if (err > 0) {
 			err = ip_cmsg_send(sk, msg, &ipc,
 					   sk->sk_family == AF_INET6);
+			connected = 0;
+		}
 		if (unlikely(err < 0)) {
 			kfree(ipc.opt);
 			return err;
 		}
 		if (ipc.opt)
 			free = 1;
-		connected = 0;
 	}
 	if (!ipc.opt) {
 		struct ip_options_rcu *inet_opt;
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 8b1dd7f51249..1a4cccdd40c9 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1474,9 +1474,11 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 		ipc6.opt = opt;
 
 		err = udp_cmsg_send(sk, msg, &ipc6.gso_size);
-		if (err > 0)
+		if (err > 0) {
 			err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, fl6,
 						    &ipc6);
+			connected = false;
+		}
 		if (err < 0) {
 			fl6_sock_release(flowlabel);
 			return err;
@@ -1488,7 +1490,6 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 		}
 		if (!(opt->opt_nflen|opt->opt_flen))
 			opt = NULL;
-		connected = false;
 	}
 	if (!opt) {
 		opt = txopt_get(np);
-- 
2.34.1