network: do not remove reject type routes more than once

Usually, removing non-existing addresses, routes, and etc, are safe.
However, when multiple interfaces lost their carriers simultaneously,
then manager_drop_routes() and manager_drop_nexthop() are called multiple
times. If a route with a blackhole nexthop is removed in that process,
the later removal requests of the route fail with -EINVAL, rathar
than -ESRCH, as the corresponding nexthop does not exist anymore.

So, let's not remove routes which managed by Manager more than once.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/network/networkd-route.h b/src/network/networkd-route.h
index 331f1f9ea2..ddb433817a 100644
--- a/src/network/networkd-route.h
+++ b/src/network/networkd-route.h
@@ -52,6 +52,7 @@ typedef struct Route {
         bool protocol_set:1;
         bool pref_set:1;
         bool gateway_from_dhcp_or_ra:1;
+        bool removing:1;
 
         union in_addr_union gw;
         union in_addr_union dst;