Include PIPEX in kernel by default. And add new sysctl variable

`net.pipex.enable' to enable PIPEX.   By default, pipex is disabled
and it will not process packets from wire.  Update man pages and
update HOWTO_PIPEX_NPPPD.txt for testers.

discussed with dlg@, ok deraadt@ mcbride@ claudio@

2 files changed, 31 insertions, 3 deletions

diff --git a/sbin/sysctl/sysctl.8 b/sbin/sysctl/sysctl.8
index 6bb7064dba1..d1311f0b6a1 100644
--- a/sbin/sysctl/sysctl.8
+++ b/sbin/sysctl/sysctl.8
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: sysctl.8,v 1.160 2011/07/06 23:44:20 sthen Exp $
+.\"	$OpenBSD: sysctl.8,v 1.161 2011/07/08 18:30:17 yasuoka Exp $
 .\"	$NetBSD: sysctl.8,v 1.4 1995/09/30 07:12:49 thorpej Exp $
 .\"
 .\" Copyright (c) 1993
@@ -30,7 +30,7 @@
 .\"
 .\"	@(#)sysctl.8	8.2 (Berkeley) 5/9/95
 .\"
-.Dd $Mdocdate: July 6 2011 $
+.Dd $Mdocdate: July 8 2011 $
 .Dt SYSCTL 8
 .Os
 .Sh NAME
@@ -317,6 +317,7 @@ and a few require a kernel compiled with non-standard
 .It net.inet6.icmp6.mtudisc_hiwat	integer	yes
 .It net.inet6.icmp6.mtudisc_lowat	integer	yes
 .It net.inet6.icmp6.nd6_debug	integer	yes
+.It net.pipex.enable	integer	yes
 .It debug.syncprt	integer	yes
 .It debug.busyprt	integer	yes
 .It debug.doclusterread	integer	yes
diff --git a/sbin/sysctl/sysctl.c b/sbin/sysctl/sysctl.c
index c9476e84666..fe26c1f0107 100644
--- a/sbin/sysctl/sysctl.c
+++ b/sbin/sysctl/sysctl.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sysctl.c,v 1.176 2011/05/23 01:33:20 djm Exp $	*/
+/*	$OpenBSD: sysctl.c,v 1.177 2011/07/08 18:30:17 yasuoka Exp $	*/
 /*	$NetBSD: sysctl.c,v 1.9 1995/09/30 07:12:50 thorpej Exp $	*/
 
 /*
@@ -72,6 +72,7 @@
 
 #include <net/pfvar.h>
 #include <net/if_pfsync.h>
+#include <net/pipex.h>
 
 #ifdef INET6
 #include <netinet/ip6.h>
@@ -591,6 +592,12 @@ parse(char *string, int flags)
 				return;
 			break;
 		}
+		if (mib[1] == PF_PIPEX) {
+			len = sysctl_pipex(string, &bufp, mib, flags, &type);
+			if (len < 0)
+				return;
+			break;
+		}
 		if (flags == 0)
 			return;
 		warnx("use netstat to view %s information", string);
@@ -1346,6 +1353,7 @@ struct ctlname pfsyncname[] = PFSYNCCTL_NAMES;
 struct ctlname divertname[] = DIVERTCTL_NAMES;
 struct ctlname bpfname[] = CTL_NET_BPF_NAMES;
 struct ctlname ifqname[] = CTL_IFQ_NAMES;
+struct ctlname pipexname[] = PIPEXCTL_NAMES;
 struct list inetlist = { inetname, IPPROTO_MAXID };
 struct list inetvars[] = {
 	{ ipname, IPCTL_MAXID },	/* ip */
@@ -1610,6 +1618,7 @@ struct list inetvars[] = {
 };
 struct list bpflist = { bpfname, NET_BPF_MAXID };
 struct list ifqlist = { ifqname, IFQCTL_MAXID };
+struct list pipexlist = { pipexname, PIPEXCTL_MAXID };
 
 struct list kernmalloclist = { kernmallocname, KERN_MALLOC_MAXID };
 struct list forkstatlist = { forkstatname, KERN_FORKSTAT_MAXID };
@@ -2171,6 +2180,24 @@ sysctl_mpls(char *string, char **bufpp, int mib[], int flags, int *typep)
 	return (3);
 }
 
+/* handle PIPEX requests */
+int
+sysctl_pipex(char *string, char **bufpp, int mib[], int flags, int *typep)
+{
+	struct list *lp;
+	int indx;
+
+	if (*bufpp == NULL) {
+		listall(string, &pipexlist);
+		return (-1);
+	}
+	if ((indx = findname(string, "third", bufpp, &pipexlist)) == -1)
+		return (-1);
+	mib[2] = indx;
+	*typep = pipexlist.list[indx].ctl_type;
+	return (3);
+}
+
 /*
  * Handle SysV semaphore info requests
  */