Nandakumar Raghavan
f7e6645ac6
Allow users to allow DHCPv6 unreachable/blackhole routes (installed for delegated prefixes) into a specific routing table, analogous to the existing RouteTable= in [DHCPv4] and [IPv6AcceptRA]. The config parser config_parse_dhcp_or_ra_route_table() is extended with an AF_UNSPEC ltype discriminator for DHCPv6 (AF_INET6 is already taken by NDISC/RA). link_get_dhcp6_route_table() follows the same pattern as link_get_dhcp4_route_table() and link_get_ndisc_route_table(), falling back to the VRF table when not explicitly set. In dhcp_request_unreachable_route(), the table is applied only for NETWORK_CONFIG_SOURCE_DHCP6 routes (the uplink unreachable aggregates), not DHCP_PD routes (per-subnet routes on downstream interfaces), matching the intent of the feature. The !route->table_set guard avoids overriding a table already set by the route code.
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