Il 23/02/2012 03:06, Eric Dumazet ha scritto:
Thanks !

Please try following patch.

diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c
index 534972e..f170933 100644
--- a/net/ipv4/xfrm4_mode_tunnel.c
+++ b/net/ipv4/xfrm4_mode_tunnel.c
@@ -84,9 +84,11 @@ static int xfrm4_mode_tunnel_input(struct xfrm_state *x, 
struct sk_buff *skb)
        if (!(x->props.flags&  XFRM_STATE_NOECN))
                ipip_ecn_decapsulate(skb);

-       old_mac = skb_mac_header(skb);
-       skb_set_mac_header(skb, -skb->mac_len);
-       memmove(skb_mac_header(skb), old_mac, skb->mac_len);
+       if (skb_mac_header_was_set(skb)) {
+               old_mac = skb_mac_header(skb);
+               skb_set_mac_header(skb, -skb->mac_len);
+               memmove(skb_mac_header(skb), old_mac, skb->mac_len);
+       }
        skb_reset_network_header(skb);
        err = 0;


Your patch does solve the problem, thanks!

Niccolò



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