netdev - [iproute2] libnetlink: reduce size of message sent to kernel

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Date:   Sat, 19 Nov 2016 23:50:13 +0800
From:   Zhang Shengju <zhangshengju@...s.chinamobile.com>
To:     netdev@...r.kernel.org
Subject: [iproute2] libnetlink: reduce size of message sent to kernel

This patch reduce the size of message sent to kernel space. Before this
patch, for command: 'ip link show', we will sent 1056 bytes. With this
patch, we only need to send 40 bytes.

Signed-off-by: Zhang Shengju <zhangshengju@...s.chinamobile.com>
---
 lib/libnetlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/libnetlink.c b/lib/libnetlink.c
index 2279935..d0e19cc 100644
--- a/lib/libnetlink.c
+++ b/lib/libnetlink.c
@@ -149,7 +149,7 @@ int rtnl_wilddump_req_filter_fn(struct rtnl_handle *rth, int family, int type,
 	if (err)
 		return err;
 
-	return send(rth->fd, (void*)&req, sizeof(req), 0);
+	return send(rth->fd, (void*)&req, req.nlh.nlmsg_len, 0);
 }
 
 int rtnl_wilddump_stats_req_filter(struct rtnl_handle *rth, int fam, int type,
-- 
1.8.3.1