linux-cp: Handle RTA_VIA routes.

RTA_VIA allows routes to have a next-hop in a different address family.
This commit makes linux-cp import those types of routes correctly,
instead of importing the routes without a gateway.

This uses rtnl_route_nh_get_gateway, which is available since libnl
3.4.0 (Oct. 9, 2017). Even Debian Stretch has it via backports.

Type: fix
Change-Id: I06297c700461ba7874eb8baf9355bd40990b3121
Signed-off-by: Adrian Pistol <vifino@posteo.net>

diff --git a/src/plugins/linux-cp/lcp_router.c b/src/plugins/linux-cp/lcp_router.c
index 01eca9f..c5846cf 100644 (file)
--- a/src/plugins/linux-cp/lcp_router.c
+++ b/src/plugins/linux-cp/lcp_router.c
@@ -1022,10 +1022,11 @@ lcp_router_route_path_parse (struct rtnl_nexthop *rnh, void *arg)
       path->frp_preference = ctx->preference;
 
       addr = rtnl_route_nh_get_gateway (rnh);
+      if (!addr)
+       addr = rtnl_route_nh_get_via (rnh);
 
       if (addr)
-       fproto = lcp_router_mk_addr46 (rtnl_route_nh_get_gateway (rnh),
-                                      &path->frp_addr);
+       fproto = lcp_router_mk_addr46 (addr, &path->frp_addr);
       else
        fproto = ctx->route_proto;