From ce12ce87d291522f11dbdffa40853d35e0846adc Mon Sep 17 00:00:00 2001
From: mcbride <mcbride@openbsd.org>
Date: Fri, 27 May 2005 04:55:27 +0000
Subject: Experimental support for opportunitic use of jumbograms where only
 some hosts on the local network support them.

This adds a new socket option, SO_JUMBO, and a new route flag,
RTF_JUMBO. If _both_ the socket option is set and the route for the host
has RTF_JUMBO set, ip_output will fragment the packet to the largest
possible size for the link, ignoring the card's MTU.

The semantics of this feature will be evolving rapidly; talk to us
if you intend to use it.

ok deraadt@ marius@
---
 sys/net/rtsock.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'sys/net/rtsock.c')

diff --git a/sys/net/rtsock.c b/sys/net/rtsock.c
index f19aabbf2cd..2085dd99568 100644
--- a/sys/net/rtsock.c
+++ b/sys/net/rtsock.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: rtsock.c,v 1.43 2004/09/16 22:31:29 henning Exp $	*/
+/*	$OpenBSD: rtsock.c,v 1.44 2005/05/27 04:55:27 mcbride Exp $	*/
 /*	$NetBSD: rtsock.c,v 1.18 1996/03/29 00:32:10 cgd Exp $	*/
 
 /*
@@ -396,6 +396,12 @@ report:
 				    rt->rt_ifp = ifp;
 				}
 			}
+
+			/* XXX Hack to allow the jumbo flag to be toggled */
+			if (rtm->rtm_flags & RTF_JUMBO)
+				rt->rt_flags = (rt->rt_flags & ~rtm->rtm_use) |
+				    (rtm->rtm_flags & rtm->rtm_use);
+
 			rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx,
 			    &rt->rt_rmx);
 			if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
-- 
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