Re: [PATCH net-next 2/2] selftests: seg6: add test for post-encap SID route lookup

[Nicolas Dichtel <nicolas.dichtel@6wind.com>]

Le 11/07/2026 à 18:29, Andrea Mayer a écrit :
> Add a selftest for the SEG6_IPTUNNEL_TABLE attribute, which selects the FIB
> table for the post-encap SID route lookup. This looks up the route for the
> first SID, the outer destination of the encapsulated packet.
> 
> Two routers provide L3 VPN services over an IPv6 underlay. Each router uses
> a separate VRF per tenant, with default blackhole routes (IPv4 and IPv6)
> that drop unmatched traffic. Tenant traffic is encapsulated, then
> decapsulated with an End.DT46.
> The encap routes are installed in the tenant VRF, but the routes that match
> the first SIDs live in a separate underlay table (500). The "lookup 500"
> attribute points the lookup there rather than to the VRF.
> 
> The test covers both the input path, where forwarded host traffic triggers
> encapsulation, and the output path, where a router originates traffic from
> its own loopback inside a VRF.
> With the "lookup" attribute, traffic reaches its destination on both paths.
> Without it, on the input path the lookup stays in the VRF and hits the
> blackhole, and on the output path it falls through to the main table, which
> has no matching route.
> 
> Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it>

Reviewed-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>