The following reply was made to PR bin/111493; it has been noted by GNATS.
From: Bruce Simpson <b...@incunabulum.net>
To: freebsd-gnats-sub...@freebsd.org
Cc:
Subject: Re: bin/111493: [patch] routed(8) doesn't use multicasts for RIPv2
via P2P interfaces
Date: Sat, 10 Apr 2010 14:27:00 +0100
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Pulled up proposed patch on HEAD.
FreeBSD's routed has deviated from vendor branch too much, and the
vendor branch history got lost in the noise of the SVN conversion.
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diff -uNr -x '.svn*' -x 'Makefile*' -x md5.c routed/output.c routedx/output.c
--- routed/output.c 2010-04-10 14:21:52.000000000 +0100
+++ routedx/output.c 2007-08-13 16:33:55.000000000 +0100
@@ -140,8 +142,8 @@
flags = MSG_DONTROUTE;
break;
case OUT_MULTICAST:
- if ((ifp->int_if_flags & (IFF_POINTOPOINT|IFF_MULTICAST)) ==
- IFF_POINTOPOINT) {
+ if ((ifp->int_if_flags & IFF_POINTOPOINT)
+ && !(ifp->int_if_flags & IFF_MULTICAST)) {
msg = "Send pt-to-pt";
} else if (ifp->int_state & IS_DUP) {
trace_act("abort multicast output via %s"
@@ -862,9 +877,10 @@
} else if (ifp->int_if_flags & IFF_POINTOPOINT) {
/* point-to-point hardware interface */
dst.sin_addr.s_addr = ifp->int_dstaddr;
- if (vers == RIPv2 &&
- ifp->int_if_flags & IFF_MULTICAST &&
- !(ifp->int_state & IS_NO_RIP_MCAST)) {
+ /* use multicast if the interface allows (e.g. GRE) */
+ if (vers == RIPv2
+ && (ifp->int_if_flags & IFF_MULTICAST)
+ && !(ifp->int_state & IS_NO_RIP_MCAST)) {
type = OUT_MULTICAST;
} else {
type = OUT_UNICAST;
@@ -957,7 +973,14 @@
} else if (ifp->int_if_flags & IFF_POINTOPOINT) {
/* point-to-point hardware interface */
dst.sin_addr.s_addr = ifp->int_dstaddr;
- type = OUT_UNICAST;
+ /* use multicast if the interface allows (e.g. GRE) */
+ if (buf.rip_vers == RIPv2
+ && (ifp->int_if_flags & IFF_MULTICAST)
+ && !(ifp->int_state & IS_NO_RIP_MCAST)) {
+ type = OUT_MULTICAST;
+ } else {
+ type = OUT_UNICAST;
+ }
} else if (ifp->int_state & IS_REMOTE) {
/* remote interface */
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