netdev - [PATCH 2/3] net/ipv4/udp_tunnel: prefer SO_BINDTOIF over SO

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Message-Id: <20190110142529.14315-2-dh.herrmann@gmail.com>
Date:   Thu, 10 Jan 2019 15:25:28 +0100
From:   David Herrmann <dh.herrmann@...il.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, teg@...m.no,
        David Herrmann <dh.herrmann@...il.com>
Subject: [PATCH 2/3] net/ipv4/udp_tunnel: prefer SO_BINDTOIF over SO_BINDTODEVICE

The udp-tunnel setup allows binding sockets to a network device. Prefer
the new SO_BINDTOIF to avoid temporarily resolving the device-name just
to look it up in the ioctl again.

Signed-off-by: David Herrmann <dh.herrmann@...il.com>
---
 net/ipv4/udp_tunnel.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/net/ipv4/udp_tunnel.c b/net/ipv4/udp_tunnel.c
index be8b5b2157d8..5d26c501da3b 100644
--- a/net/ipv4/udp_tunnel.c
+++ b/net/ipv4/udp_tunnel.c
@@ -21,18 +21,9 @@ int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
 		goto error;
 
 	if (cfg->bind_ifindex) {
-		struct net_device *dev;
-
-		dev = dev_get_by_index(net, cfg->bind_ifindex);
-		if (!dev) {
-			err = -ENODEV;
-			goto error;
-		}
-
-		err = kernel_setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE,
-					dev->name, strlen(dev->name) + 1);
-		dev_put(dev);
-
+		err = kernel_setsockopt(sock, SOL_SOCKET, SO_BINDTOIF,
+					(void *)&cfg->bind_ifindex,
+					sizeof(cfg->bind_ifindex));
 		if (err < 0)
 			goto error;
 	}
-- 
2.20.1