network: adjust nexthops of dynamic routes before requesting

No effective functionality is changed. Preparation for later commits.

src/network/networkd-dhcp-prefix-delegation.c

@@ -300,6 +300,10 @@ static int dhcp_pd_request_route(Link *link, const struct in6_addr *prefix, usec
         route->priority = link->network->dhcp_pd_route_metric;
         route->lifetime_usec = lifetime_usec;
 
+        r = route_adjust_nexthops(route, link);
+        if (r < 0)
+                return r;
+
         if (route_get(NULL, link, route, &existing) < 0)
                 link->dhcp_pd_configured = false;
         else
@@ -695,6 +699,10 @@ static int dhcp_request_unreachable_route(
         route->priority = IP6_RT_PRIO_USER;
         route->lifetime_usec = lifetime_usec;
 
+        r = route_adjust_nexthops(route, link);
+        if (r < 0)
+                return r;
+
         if (route_get(link->manager, NULL, route, &existing) < 0)
                 *configured = false;
         else
@@ -789,6 +797,10 @@ static int dhcp4_pd_request_default_gateway_on_6rd_tunnel(Link *link, const stru
         route->priority = IP6_RT_PRIO_USER;
         route->lifetime_usec = lifetime_usec;
 
+        r = route_adjust_nexthops(route, link);
+        if (r < 0)
+                return r;
+
         if (route_get(NULL, link, route, &existing) < 0) /* This is a new route. */
                 link->dhcp_pd_configured = false;
         else

src/network/networkd-dhcp4.c

@@ -390,6 +390,10 @@ static int dhcp4_request_route(Route *in, Link *link) {
         if (r < 0)
                 return r;
 
+        r = route_adjust_nexthops(route, link);
+        if (r < 0)
+                return r;
+
         if (route_get(NULL, link, route, &existing) < 0) /* This is a new route. */
                 link->dhcp4_configured = false;
         else

src/network/networkd-ndisc.c

@@ -218,6 +218,10 @@ static int ndisc_request_route(Route *in, Link *link, sd_ndisc_router *rt) {
         if (r < 0)
                 return r;
 
+        r = route_adjust_nexthops(route, link);
+        if (r < 0)
+                return r;
+
         is_new = route_get(NULL, link, route, NULL) < 0;
 
         r = link_request_route(link, TAKE_PTR(route), true, &link->ndisc_messages,