netdev - Re: [PATCH ipsec-next 3/3] xfrm: lwtunnel: add lwtunnel support for xfrm interfaces in collect

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Date:   Wed, 24 Aug 2022 17:21:02 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Eyal Birger <eyal.birger@...il.com>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
        pablo@...filter.org, contact@...elbtn.com, dsahern@...nel.org
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, devel@...ux-ipsec.org
Subject: Re: [PATCH ipsec-next 3/3] xfrm: lwtunnel: add lwtunnel support for
 xfrm interfaces in collect_md mode


Le 23/08/2022 à 17:45, Eyal Birger a écrit :
> Allow specifying the xfrm interface if_id as part of a route metadata
> using the lwtunnel infrastructure.
> 
> This allows for example using a single xfrm interface in collect_md
> mode as the target of multiple routes each specifying a different if_id.
> 
> With the appropriate changes to iproute2, considering an xfrm device
> ipsec1 in collect_md mode one can for example add a route specifying
> an if_id like so:
> 
> ip route add <SUBNET> dev ipsec1 encap xfrm if_id 1
It would be nice to be able to specify the link also. It may help to combine
this with vrf. Something like
ip route add <SUBNET> dev ipsec1 encap xfrm if_id 1 dev eth0