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NG_IPFW(4)		     Kernel Interfaces Manual		      NG_IPFW(4)

NAME
     ng_ipfw -- interface between netgraph and IP firewall

SYNOPSIS
     #include <netinet/ip_var.h>
     #include <netgraph/ng_ipfw.h>

DESCRIPTION
     The  ipfw node implements interface between ipfw(4) and netgraph(4) subsys-
     tems.

HOOKS
     The ipfw node supports an arbitrary number of hooks, which  must  be  named
     using only numeric characters.

OPERATION
     Once the ng_ipfw module is loaded into the kernel, a single node named ipfw
     is  automatically	created.   No  more ipfw nodes can be created.	Once de-
     stroyed, the only way to recreate the node is to reload the ng_ipfw module.

     Packets can be injected into netgraph(4) using either the netgraph or ngtee
     commands of the ipfw(8) utility.  These commands require a  numeric  cookie
     to be supplied as an argument.  Packets are sent out of the hook whose name
     equals the cookie value.  If no hook matches, packets are discarded.  Pack-
     ets injected via the netgraph command are tagged with struct ipfw_rule_ref.
     This  tag	contains  information  that helps the packet to re-enter ipfw(4)
     processing, should the packet come back from netgraph(4) to ipfw(4).

     Packets received by a node from netgraph(4) subsystem must be  tagged  with
     struct  ipfw_rule_ref  tag.  Packets re-enter IP firewall processing at the
     next rule.  If no tag is supplied, packets are discarded.

CONTROL MESSAGES
     This node type supports only the generic control messages.

SHUTDOWN
     This node shuts down upon receipt of a NGM_SHUTDOWN  control  message.   Do
     not  do  this, since the new ipfw node can only be created by reloading the
     ng_ipfw module.

SEE ALSO
     ipfw(4), netgraph(4), ipfw(8), mbuf_tags(9)

HISTORY
     The ipfw node type was implemented in FreeBSD 6.0.

AUTHORS
     The ipfw node was written by Gleb Smirnoff <glebius@FreeBSD.org>.

FreeBSD ports 15.quarterly	  March 2, 2010 		      NG_IPFW(4)

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