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authorSteffen Klassert <steffen.klassert@secunet.com>2008-06-17 16:37:13 -0700
committerDavid S. Miller <davem@davemloft.net>2008-06-17 16:38:23 -0700
commitfe833fca2eac6b3d3ad5e35f44ad4638362f1da8 (patch)
tree5069eb9f5b9c9f881fb42dc0e2c347ef7b45036f /net/ipv4/xfrm4_mode_tunnel.c
parentnetfilter: nf_conntrack_h323: fix module unload crash (diff)
downloadlinux-dev-fe833fca2eac6b3d3ad5e35f44ad4638362f1da8.tar.xz
linux-dev-fe833fca2eac6b3d3ad5e35f44ad4638362f1da8.zip
xfrm: fix fragmentation for ipv4 xfrm tunnel
When generating the ip header for the transformed packet we just copy the frag_off field of the ip header from the original packet to the ip header of the new generated packet. If we receive a packet as a chain of fragments, all but the last of the new generated packets have the IP_MF flag set. We have to mask the frag_off field to only keep the IP_DF flag from the original packet. This got lost with git commit 36cf9acf93e8561d9faec24849e57688a81eb9c5 ("[IPSEC]: Separate inner/outer mode processing on output") Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/xfrm4_mode_tunnel.c')
-rw-r--r--net/ipv4/xfrm4_mode_tunnel.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c
index 584e6d74e3a9..7135279f3f84 100644
--- a/net/ipv4/xfrm4_mode_tunnel.c
+++ b/net/ipv4/xfrm4_mode_tunnel.c
@@ -52,7 +52,7 @@ static int xfrm4_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
IP_ECN_clear(top_iph);
top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
- 0 : XFRM_MODE_SKB_CB(skb)->frag_off;
+ 0 : (XFRM_MODE_SKB_CB(skb)->frag_off & htons(IP_DF));
ip_select_ident(top_iph, dst->child, NULL);
top_iph->ttl = dst_metric(dst->child, RTAX_HOPLIMIT);