tree ca5ccc41834e4c811e859724a184f223a3772ca7
parent 6fac41157252220678b210fcb13e2c3dad7a912a
author Nicolas Dichtel <nicolas.dichtel@6wind.com> 1361526894 +0100
committer Steffen Klassert <steffen.klassert@secunet.com> 1362549765 +0100

xfrm: allow to avoid copying DSCP during encapsulation

By default, DSCP is copying during encapsulation.
Copying the DSCP in IPsec tunneling may be a bit dangerous because packets with
different DSCP may get reordered relative to each other in the network and then
dropped by the remote IPsec GW if the reordering becomes too big compared to the
replay window.

It is possible to avoid this copy with netfilter rules, but it's very convenient
to be able to configure it for each SA directly.

This patch adds a toogle for this purpose. By default, it's not set to maintain
backward compatibility.

Field flags in struct xfrm_usersa_info is full, hence I add a new attribute.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>