commit 628a5c561890a9a9a74dea017873530584aab06e
author John Heffner <jheffner@psc.edu> Fri Apr 20 15:53:27 2007 -0700
committer David S. Miller <davem@sunset.davemloft.net> Wed Apr 25 22:29:10 2007 -0700
tree f10edc4078c3f19487bbe3a902ecadda89273361
parent b881ef7603230550aa0150b22af94089f07ab00d

[INET]: Add IP(V6)_PMTUDISC_RPOBE

Add IP(V6)_PMTUDISC_PROBE value for IP(V6)_MTU_DISCOVER.  This option forces
us not to fragment, but does not make use of the kernel path MTU discovery.
That is, it allows for user-mode MTU probing (or, packetization-layer path
MTU discovery).  This is particularly useful for diagnostic utilities, like
traceroute/tracepath.

Signed-off-by: John Heffner <jheffner@psc.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/in6.h

diff --git a/include/linux/in6.h b/include/linux/in6.h
index 4e8350a..d559fac 100644
--- a/include/linux/in6.h
+++ b/include/linux/in6.h
@@ -179,6 +179,7 @@
 #define IPV6_PMTUDISC_DONT		0
 #define IPV6_PMTUDISC_WANT		1
 #define IPV6_PMTUDISC_DO		2
+#define IPV6_PMTUDISC_PROBE		3
 
 /* Flowlabel */
 #define IPV6_FLOWLABEL_MGR	32