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ng_ipfw.4freebsd
Langue: en
Version: 300198 (debian - 07/07/09)
Section: 4 (Pilotes et protocoles réseau)
BSD mandoc
NAME
ng_ipfw - interface between netgraph and IP firewallSYNOPSIS
In netgraph/ng_ipfw.hDESCRIPTION
The ipfw node implements interface between ipfw(4) and netgraph(4) subsystems.HOOKS
The ipfw node supports an arbitrary number of hooks, which must be named using only numeric characters.OPERATION
Once the module is loaded into the kernel, a single node named ipfw is automatically created. No more ipfw nodes can be created. Once destroyed, the only way to recreate the node is to reload the 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. Packets injected via the netgraph command are tagged with Vt struct ng_ipfw_tag . 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).
struct ng_ipfw_tag { struct m_tag mt; /* tag header */ struct ip_fw *rule; /* matching rule */ struct ifnet *ifp; /* interface, for ip_output */ int dir; /* packet direction */ #define NG_IPFW_OUT 0 #define NG_IPFW_IN 1 int flags; /* flags, for ip_output() */ };
Packets received by a node from netgraph(4) must be tagged with Vt struct ng_ipfw_tag 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 module.SEE ALSO
ipfw(4), netgraph(4), ipfw(8), mbuf_tags9HISTORY
The ipfw node type was implemented in Fx 6.0 .AUTHORS
The ipfw node was written by An Gleb Smirnoff Aq glebius@FreeBSD.org .Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre