Date: Tue, 21 Feb 2012 20:11:28 -0800 (PST) From: Craig Leres <leres@ee.lbl.gov> To: FreeBSD-gnats-submit@FreeBSD.org Cc: Craig Leres <leres@ee.lbl.gov> Subject: bin/165384: [PATCH] Add option to suppress RA prefix info Message-ID: <201202220411.q1M4BSsE071128@hot.ee.lbl.gov> Resent-Message-ID: <201202220420.q1M4KCkh021322@freefall.freebsd.org>
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>Number: 165384
>Category: bin
>Synopsis: [PATCH] Add option to suppress RA prefix info
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Wed Feb 22 04:20:11 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Craig Leres
>Release: FreeBSD 8.2-RELEASE amd64
>Organization:
Lawrence Berkeley National Laboratory
>Environment:
FreeBSD hot.ee.lbl.gov 8.2-RELEASE FreeBSD 8.2-RELEASE #11 r43: Tue Oct 4 13:18:06 PDT 2011 leres@hot.ee.lbl.gov:/usr/src/8.2-RELEASE/sys/amd64/compile/LBLIPV6 amd64
>Description:
To create a stateful IPv6 DHCP environment, routing
advertisement messages must set the "managed" flag, may
optionally set the "other stateful" flag and must not include
any prefix information; including prefix information in
router advertisemessages explicitly allows clients to use
stateless address autoconfiguration.
rtadvd does not provide a configuration option to suppress
prefix info. If you do not explicitly specify one or more
"addr" options, rtadvd automatically discovers prefixes by
iterating over the interfaces.
>How-To-Repeat:
>Fix:
The attached patches add a "noprefix" option to rtadvd.conf.
--- patch-config.c begins here ---
Index: config.c
===================================================================
--- config.c (revision 43)
+++ config.c (working copy)
@@ -283,6 +283,13 @@
if (addr == NULL)
continue;
+ if (agetflag("noprefix")) {
+ syslog(LOG_ERR,
+ "noprefix is set but addr is set (%s); ignoring",
+ addr);
+ continue;
+ }
+
/* allocate memory to store prefix information */
if ((pfx = malloc(sizeof(struct prefix))) == NULL) {
syslog(LOG_ERR,
@@ -381,7 +388,7 @@
now.tv_sec + pfx->preflifetime;
}
}
- if (tmp->pfxs == 0)
+ if (tmp->pfxs == 0 && !agetflag("noprefix"))
get_prefix(tmp);
MAYHAVE(val, "mtu", 0);
--- patch-config.c ends here ---
--- patch-rtadvd.conf.5 begins here ---
Index: rtadvd.conf.5
===================================================================
--- rtadvd.conf.5 (revision 43)
+++ rtadvd.conf.5 (working copy)
@@ -172,7 +172,10 @@
.El
.Pp
The following items are for ICMPv6 prefix information option,
-which will be attached to router advertisement header.
+which will be attached to router advertisement header
+unless the
+.Cm noprefix
+option is specified.
These items can be omitted, then
.Nm rtadvd
will automatically get appropriate prefixes from the kernel's routing table,
@@ -183,6 +186,8 @@
.Dq Li prefix2 ,
to specify multiple prefixes.
.Bl -tag -width indent
+.It Cm \&noprefix
+(bool) Suppress prefix headers.
.It Cm \&clockskew
(num) Time skew to adjust link propagation delays and clock skews
between routers on the link
--- patch-rtadvd.conf.5 ends here ---
>Release-Note:
>Audit-Trail:
>Unformatted:
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