From 336d023b2ed22064b0e800275fcf7e385f3d4d03 Mon Sep 17 00:00:00 2001
From: "Bjoern A. Zeeb" <bz@FreeBSD.org>
Date: Sun, 17 Apr 2011 16:35:16 +0000
Subject: [PATCH] Make in_proto.c dependent on either inet or inet6.

While it does not provide any functionality for IPv6, it provides
the sysctl nodes for net.inet.* that a lot of functionality shared
between IPv4 and IPv6 depends on.  We cannot change these anymore
without breaking a lot of management and tuning.

In case of IPv6 only, we compile out everything but the sysctl node
declarations.

Reviewed by:	gnn
Sponsored by:	The FreeBSD Foundation
Sponsored by:	iXsystems
MFC After:	5 days
---
 sys/conf/files         | 2 +-
 sys/netinet/in_proto.c | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/sys/conf/files b/sys/conf/files
index b772c78c5f67..ee9d597ab947 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -2653,7 +2653,7 @@ netinet/ip_gre.c		optional gre inet
 netinet/ip_id.c			optional inet
 netinet/in_mcast.c		optional inet
 netinet/in_pcb.c		optional inet | inet6
-netinet/in_proto.c		optional inet \
+netinet/in_proto.c		optional inet | inet6 \
 	compile-with "${NORMAL_C} -I$S/contrib/pf"
 netinet/in_rmx.c		optional inet
 netinet/ip_divert.c		optional inet ipdivert ipfirewall
diff --git a/sys/netinet/in_proto.c b/sys/netinet/in_proto.c
index 110301a51006..a5907ec69338 100644
--- a/sys/netinet/in_proto.c
+++ b/sys/netinet/in_proto.c
@@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$");
 #include "opt_ipx.h"
 #include "opt_mrouting.h"
 #include "opt_ipsec.h"
+#include "opt_inet.h"
 #include "opt_inet6.h"
 #include "opt_pf.h"
 #include "opt_sctp.h"
@@ -50,6 +51,13 @@ __FBSDID("$FreeBSD$");
 #include <sys/queue.h>
 #include <sys/sysctl.h>
 
+/*
+ * While this file provides the domain and protocol switch tables for IPv4, it
+ * also provides the sysctl node declarations for net.inet.* often shared with
+ * IPv6 for common features or by upper layer protocols.  In case of no IPv4
+ * support compile out everything but these sysctl nodes.
+ */
+#ifdef INET
 #include <net/if.h>
 #include <net/route.h>
 #ifdef RADIX_MPATH
@@ -372,6 +380,7 @@ struct domain inetdomain = {
 };
 
 VNET_DOMAIN_SET(inet);
+#endif /* INET */
 
 SYSCTL_NODE(_net,      PF_INET,		inet,	CTLFLAG_RW, 0,
 	"Internet Family");