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Add section describing existing filtering points.

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Document byteorder behavior in AF_INET[6] hooks in new section.

MFC after:	2 weeks
This commit is contained in:
Alexander V. Chernikov 2012-09-16 13:13:02 +00:00
parent 4f06dcbd80
commit 54202ab3d1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=240561
1 changed files with 13 additions and 18 deletions
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31
share/man/man9/pfil.9
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@ -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 the packet processing is to stop, or 0
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