Fix #39: allow use of loopback interface for routing

The loopback interface should be allowed once the multicast flag has been enabled (with `ip link set multicast on dev lo`). Enabling mrouted on a loopback interface work just fine on Linux. Signed-off-by: Joachim Wiberg <[email protected]>
troglobit · Sep 20, 2020 · 9961051 · 9961051
1 parent 61767ba
commit 9961051
Showing 1 changed file with 7 additions and 4 deletions.
diff --git a/src/config.c b/src/config.c
@@ -32,16 +32,19 @@ void config_vifs_from_kernel(void)
 	/*
 	 * Ignore any interface for an address family other than IP.
 	 */
-	if (!ifa->ifa_addr || ifa->ifa_addr->sa_family != AF_INET)
+	if (!ifa->ifa_addr || ifa->ifa_addr->sa_family != AF_INET) {
+	    logit(LOG_INFO, 0, "skipping (this instance of) %s, no IPv4 address.", ifa->ifa_name);
 	    continue;
+	}
 
 	/*
-	 * Ignore loopback interfaces and interfaces that do not support
-	 * multicast.
+	 * Ignore interfaces that do not support multicast.
 	 */
 	flags = ifa->ifa_flags;
-	if ((flags & (IFF_LOOPBACK|IFF_MULTICAST)) != IFF_MULTICAST)
+	if (!(flags & IFF_MULTICAST)) {
+	    logit(LOG_INFO, 0, "skipping %s, does not support multicast.", ifa->ifa_name);
 	    continue;
+	}
 
 	/*
 	 * Perform some sanity checks on the address and subnet, ignore any