svn commit: r193218 - head/share/man/man4

[Pawel Jakub Dawidek]

Author: pjd
Date: Mon Jun  1 10:30:52 2009
New Revision: 193218
URL: http://svn.freebsd.org/changeset/base/193218

Log:
  Document IP_BINDANY IP socket option.
  
  Reviewed by:	brueffer

Modified:
  head/share/man/man4/ip.4

Modified: head/share/man/man4/ip.4
==============================================================================
--- head/share/man/man4/ip.4	Mon Jun  1 10:30:00 2009	(r193217)
+++ head/share/man/man4/ip.4	Mon Jun  1 10:30:52 2009	(r193218)
@@ -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