From: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Date: Sat, 19 Nov 2016 15:50:13 +0000 (+0800)
Subject: libnetlink: reduce size of message sent to kernel
X-Git-Tag: v4.9.0~24
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1b109a30bf711833da0f674e46da8aaafa6a9e4f;p=thirdparty%2Fiproute2.git

libnetlink: reduce size of message sent to kernel

Fixes commit 246f57c4086d99fa ("ip link: Add support for kernel
side filtering").

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@cmss.chinamobile.com>
---

diff --git a/lib/libnetlink.c b/lib/libnetlink.c
index 22799355e..7f2a0d447 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, &req, req.nlh.nlmsg_len, 0);
 }
 
 int rtnl_wilddump_stats_req_filter(struct rtnl_handle *rth, int fam, int type,