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From: "Alexander V. Chernikov" <melifaro@FreeBSD.org>
Date: Sun, 16 Sep 2012 13:13:02 +0000 (UTC)
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Subject: svn commit: r240561 - head/share/man/man9
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Author: melifaro
Date: Sun Sep 16 13:13:02 2012
New Revision: 240561
URL: http://svn.freebsd.org/changeset/base/240561

Log:
  Add section describing existing filtering points.
  Document byteorder behavior in AF_INET[6] hooks in new section.
  
  MFC after:	2 weeks

Modified:
  head/share/man/man9/pfil.9

Modified: head/share/man/man9/pfil.9
==============================================================================
--- head/share/man/man9/pfil.9	Sun Sep 16 12:08:06 2012	(r240560)
+++ head/share/man/man9/pfil.9	Sun Sep 16 13:13:02 2012	(r240561)
@@ -28,7 +28,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd September 29, 2004
+.Dd September 16, 2012
 .Dt PFIL 9
 .Os
 .Sh NAME
@@ -122,6 +122,18 @@ The filter returns an error (errno) if t
 if the processing is to continue.
 If the packet processing is to stop, it is the responsibility of the
 filter to free the packet.
+.Sh FILTERING POINTS
+Currently, filtering points are implemented for the following link types:
+.Pp
+.Bl -tag -width "AF_INET6" -offset XXX -compact
+.It AF_INET
+.It AF_INET6
+IPv4 and IPv6 packets. Note that packet header is already
+.Cm converted to host format.
+Host format has to be preserved in case of header modifications.
+.It AF_LINK
+Link-layer packets. 
+.El
 .Sh RETURN VALUES
 If successful,
 .Fn pfil_head_get
@@ -187,23 +199,6 @@ The
 function
 is only safe for internal use.
 .Pp
-.Fx
-implements only hooks for
-.Dv AF_INET
-and
-.Dv AF_INET6 .
-Packets diverted through these hooks have data in
-host byte order contrary to the above statements.
-.Pp
-The
-.Xr if_bridge 4
-diverts
-.Dv AF_INET
-and
-.Dv AF_INET6
-traffic according to its sysctl settings, but contrary to the above
-statements, the data is provided in host byte order.
-.Pp
 When a
 .Vt pfil_head
 is being modified, no traffic is diverted