Stop our own router advertisements from looping back to us.

Pointed out by semarie@

diff --git a/usr.sbin/rad/rad.c b/usr.sbin/rad/rad.c
index 36b68f2..4652e1e 100644 (file)
--- a/usr.sbin/rad/rad.c
+++ b/usr.sbin/rad/rad.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: rad.c,v 1.8 2018/07/15 09:28:21 florian Exp $ */
+/*     $OpenBSD: rad.c,v 1.9 2018/07/18 14:43:34 florian Exp $ */
 
 /*
  * Copyright (c) 2018 Florian Obser <florian@openbsd.org>
@@ -129,7 +129,7 @@ main(int argc, char *argv[])
        char                    *saved_argv0;
        int                      pipe_main2frontend[2];
        int                      pipe_main2engine[2];
-       int                      icmp6sock, on = 1;
+       int                      icmp6sock, on = 1, off = 0;
        int                      frontend_routesock, rtfilter;
        int                      control_fd;
 
@@ -275,6 +275,10 @@ main(int argc, char *argv[])
            sizeof(on)) < 0)
                fatal("IPV6_RECVHOPLIMIT");
 
+       if (setsockopt(icmp6sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off,
+           sizeof(off)) < 0)
+               fatal("IPV6_RECVHOPLIMIT");
+
        /* only router advertisements and solicitations */
        ICMP6_FILTER_SETBLOCKALL(&filt);
        ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);