commit 19bcd64795f4a5b5c86abafd112cfaa87cb614bb
from: Stefan Sperling <stsp@stsp.name>
date: Tue Sep 03 09:12:39 2024 UTC

fix adding blackhole and reject routes; a gateway is required

Fixes an invalid route message error during nsh -i at boot time:

%  cmd:        route           (line 49) margv [route 224.0.0.0/4 127.0.0.1 iface nompath reject]
% RTM_ADD: Add Route: len 128, table 0, pid: 0, seq 1, errno 0, flags:<UP,REJECT,STATIC>
% locks:  inits: 
% sockaddrs: <DST,NETMASK>
 224.0.0.0 240.0.0.0
% ip_route: rtmsg: Invalid argument

commit - 1ecf319919277305fea3d35396c316fc23e7f3db
commit + 19bcd64795f4a5b5c86abafd112cfaa87cb614bb
blob - e589a9248c616b92452683464991fe98de5758ca
blob + a558cf19abc8bd22c365719553f577e6a42ebe5b
--- route.c
+++ route.c
@@ -220,6 +220,14 @@ route(int argc, char **argv)
 		printf("%% unknown destination address family %d\n", dest.family);
 		return(1);
 	}
+
+	/*
+	 * Adding blackhole or reject routes requires a gateway even if the
+	 * "iface" parameter was specified. A gateway argument is required when
+	 * adding routes so simply setting the GATEWAY flag here is sufficient.
+	 */
+	if (cmd == RTM_ADD && (flags & (RTF_BLACKHOLE|RTF_REJECT)))
+		flags |= RTF_GATEWAY;
 
 	flags |= RTF_UP;