| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.13 014/149] ipv6: reuse ip6_frag_id from ip6_ufo_append_data | Date | Thu, 20 Mar 2014 17:02:57 -0700 |
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3.13-stable review patch. If anyone has any objections, please let me know.
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From: Hannes Frederic Sowa <hannes@stressinduktion.org>
[ Upstream commit 916e4cf46d0204806c062c8c6c4d1f633852c5b6 ]
Currently we generate a new fragmentation id on UFO segmentation. It is pretty hairy to identify the correct net namespace and dst there. Especially tunnels use IFF_XMIT_DST_RELEASE and thus have no skb_dst available at all.
This causes unreliable or very predictable ipv6 fragmentation id generation while segmentation.
Luckily we already have pregenerated the ip6_frag_id in ip6_ufo_append_data and can use it here.
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/ipv6/udp_offload.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/ipv6/udp_offload.c +++ b/net/ipv6/udp_offload.c @@ -113,7 +113,7 @@ static struct sk_buff *udp6_ufo_fragment fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen); fptr->nexthdr = nexthdr; fptr->reserved = 0; - ipv6_select_ident(fptr, (struct rt6_info *)skb_dst(skb)); + fptr->identification = skb_shinfo(skb)->ip6_frag_id; /* Fragment the skb. ipv6 header and the remaining fields of the * fragment header are updated in ipv6_gso_segment()
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