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authorHannes Frederic Sowa <hannes@stressinduktion.org>2014-02-21 02:55:35 +0100
committerDavid S. Miller <davem@davemloft.net>2014-02-22 00:28:21 -0500
commit916e4cf46d0204806c062c8c6c4d1f633852c5b6 (patch)
tree2770571fb4c9f109eda3ea1cad8f5aa9f3248bb7
parent4c47af4d5eb2c2f78f886079a3920a7078a6f0a0 (diff)
downloadlinux-916e4cf46d0204806c062c8c6c4d1f633852c5b6.tar.bz2
ipv6: reuse ip6_frag_id from ip6_ufo_append_data
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>
-rw-r--r--net/ipv6/udp_offload.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index e7359f9eaa8d..b261ee8b83fc 100644
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -113,7 +113,7 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
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()