Re: Minor IPSec bug + solution

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Martin Bouzek <martin.bouzek@xxxxxxxxxxxx> wrote:
> 
> I was setting up an VPN via IPSec in kernel 2.6.x on IPv4 and found the
> following bug. It is not possible to set up an IPComp/ESP tunnel with
> IPComp set as mandatory. The following setup works fine for me:

You can never set IPComp as mandatory because ipcomp_output() will not
compress anything that is incompressible.

> function. For tunnels it returns 
> 
> tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family);

The check is correct as it is.  Internal states must never match any
required transform.
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