[net] rtnetlink: fix the wrong minimal dump size getting from rtnl_calcit()

[Zhang Shengju]

For RT netlink, calcit() function should return the minimal size for
netlink dump message. This will make sure that dump message for every
network device can be stored.

Currently, rtnl_calcit() function doesn't account the size of header of
netlink message, this patch will fix it.

Signed-off-by: Zhang Shengju <zhangshen...@cmss.chinamobile.com>
---
 net/core/rtnetlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index f4b9350..09e115b 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2734,7 +2734,7 @@ static u16 rtnl_calcit(struct sk_buff *skb, struct 
nlmsghdr *nlh)
                                                           ext_filter_mask));
        }
 
-       return min_ifinfo_dump_size;
+       return nlmsg_total_size(min_ifinfo_dump_size);
 }
 
 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
-- 
1.8.3.1