"The logging of errors SHOULD be restricted to conflicting information

that causes hosts to switch from one value to another with each
received advertisement." (RFC 4861)

Receiving of RAs on non-advertising interfaces is not a conflicting
information; don't log it.

"Mike." (the.lists AT mgm51 DOT com) reported that this
leads to excessive logging with certain cable providers in 2013.
Recently reported again by Aaron Riekenberg (aaron.riekenberg AT gmail
DOT com). Thanks!

OK bluhm@

diff --git a/usr.sbin/rtadvd/rtadvd.c b/usr.sbin/rtadvd/rtadvd.c
index 8c70297..7fa6180 100644 (file)
--- a/usr.sbin/rtadvd/rtadvd.c
+++ b/usr.sbin/rtadvd/rtadvd.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: rtadvd.c,v 1.51 2015/01/01 16:31:59 florian Exp $     */
+/*     $OpenBSD: rtadvd.c,v 1.52 2015/01/01 20:28:27 florian Exp $     */
 /*     $KAME: rtadvd.c,v 1.66 2002/05/29 14:18:36 itojun Exp $ */
 
 /*
@@ -810,13 +810,9 @@ ra_input(int len, struct nd_router_advert *ra,
        /*
         * RA consistency check according to RFC-2461 6.2.7
         */
-       if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == 0) {
-               log_info("received RA from %s on non-advertising interface(%s)",
-                   inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
-                       INET6_ADDRSTRLEN),
-                   if_indextoname(pi->ipi6_ifindex, ifnamebuf));
-               goto done;
-       }
+       if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == NULL)
+               goto done;      /* not our interface */
+
        rai->rainput++;         /* increment statistics */
        
        /* Cur Hop Limit value */