Eyal Birger 2c2493b9da
xfrm: lwtunnel: add lwtunnel support for xfrm interfaces in collect_md mode ...
Allow specifying the xfrm interface if_id and link 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
In which case traffic routed to the device via this route would use
if_id in the xfrm interface policy lookup.
Or in the context of vrf, one can also specify the "link" property:
ip route add <SUBNET> dev ipsec1 encap xfrm if_id 1 link_dev eth15
Note: LWT_XFRM_LINK uses NLA_U32 similar to IFLA_XFRM_LINK even though
internally "link" is signed. This is consistent with other _LINK
attributes in other devices as well as in bpf and should not have an
effect as device indexes can't be negative.
Reviewed-by: Nicolas Dichtel <nicolas.dichtel@6wind.com >
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org >
Signed-off-by: Eyal Birger <eyal.birger@gmail.com >
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com >
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2c2493b9da