From: Gao feng <gaofeng@cn.fujitsu.com>
Date: Mon, 19 Mar 2012 22:36:10 +0000 (+0000)
Subject: ipv6: fix incorrent ipv6 ipsec packet fragment
X-Git-Tag: v3.4-rc1~177^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1f85851e17b64cabd089a8a8839dddebc627948c;p=pandora-kernel.git

ipv6: fix incorrent ipv6 ipsec packet fragment

Since commit 299b0767(ipv6: Fix IPsec slowpath fragmentation problem)
In func ip6_append_data,after call skb_put(skb, fraglen + dst_exthdrlen)
the skb->len contains dst_exthdrlen,and we don't reduce dst_exthdrlen at last
This will make fraggap>0 in next "while cycle",and cause the size of skb incorrent

Fix this by reserve headroom for dst_exthdrlen.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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