From 79d6b3f34ac0df84d792748389c2bd32a2fb33f2 Mon Sep 17 00:00:00 2001
From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
Date: Mon, 1 Jun 2009 10:30:52 +0000
Subject: [PATCH] Document IP_BINDANY IP socket option.

Reviewed by:	brueffer
---
 share/man/man4/ip.4 | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/share/man/man4/ip.4 b/share/man/man4/ip.4
index 72d0490aabe8..9bf91400ee33 100644
--- a/share/man/man4/ip.4
+++ b/share/man/man4/ip.4
@@ -32,7 +32,7 @@
 .\"     @(#)ip.4	8.2 (Berkeley) 11/30/93
 .\" $FreeBSD$
 .\"
-.Dd March 9, 2009
+.Dd June 1, 2009
 .Dt IP 4
 .Os
 .Sh NAME
@@ -243,6 +243,23 @@ socket level option, otherwise the
 .Dv IP_ONESBCAST option has no effect.
 .Pp
 If the
+.Dv IP_BINDANY
+option is enabled on a
+.Dv SOCK_STREAM ,
+.Dv SOCK_DGRAM
+or a
+.Dv SOCK_RAW
+socket, one can
+.Xr bind 2
+to any address, even one not bound to any available network interface in the
+system.
+This functionality (in conjunction with special firewall rules) can be used for
+implementing a transparent proxy.
+The
+.Dv PRIV_NETINET_BINDANY
+privilege is needed to set this option.
+.Pp
+If the
 .Dv IP_RECVTTL
 option is enabled on a
 .Dv SOCK_DGRAM