Packet Filtering Hooks Kernel Functions

The packet filtering hooks kernel functions are exported from the misc/neti and misc/hook kernel modules to support packet filtering. To use these functions, link your kernel modules with -Nmisc/neti and -Nmisc/hook so that the kernel load the functions.

The following kernel functions support packet filtering:

hook_alloc: Allocate a hook_t data structure. For more information, see the hook_alloc(9F) man page.
hook_free: Free a hook_t structure that was allocated by hook_alloc(). For more information, see the hook_free(9F) man page.
net_event_notify_register: Register a function to be called when there is a change to a specified event. For more information, see the net_event_notify_register(9F) man page.
net_event_notify_unregister: Stop receiving the notification of changes to the specified event through calls to the specified callback function. For more information, see the net_event_notify_unregister(9F) man page.
net_getifname: Retrieve the name given to the specified network interface. For more information, see the net_getifname(9F) man page.
net_getlifaddr: Retrieve the network address information for each specified logical interface. For more information, see the net_getlifaddr(9F) man page.
net_getmtu: Retrieve information about the current MTU of the specified network interface. For more information, see the net_getmtu(9F) man page.
net_getpmtuenabled: Indicate whether path MTU (PMTU) discovery is enabled for the specified network protocol. For more information, see the net_getpmtuenabled(9F) man page.
net_hook_register(9F): Add a hook that allows callbacks to be registered with events that belong to the specified network protocol. For more information, see the net_hook_register(9F) man page.
net_hook_unregister(9F): Disable callback hooks that were registered with net_hook_register(). For more information, see the net_hook_register(9F) man page.
net_inject: Deliver network layer packets either into the kernel or onto the network. For more information, see the net_inject(9F) man page.
net_inject_alloc: Allocate a net_inject_t structure. For more information, see the net_inject_alloc(9F) man page.
net_inject_free: Free a net_inject_t structure that was allocated by net_inject_alloc(). For more information, see the net_inject_free(9F) man page.
net_instance_alloc: Allocate a net_instance_t structure. For more information, see the net_instance_alloc(9F) man page.
net_instance_free: Free a net_instance_t structure that was allocated by net_instance_alloc(). For more information, see the net_instance_free(9F) man page.
net_instance_notify_register: Register the specified function to be called when there is a new instance added to or removed from the specified network instance. For more information, see the net_instance_notify_register(9F) man page.
net_instance_notify_unregister: Stop receiving the notification of changes to the specified instance through calls to the specified callback function. For more information, see the net_instance_notify_unregister(9F) man page.
net_instance_register: Record the set of functions to be called when an event related to IP instance maintenance occurs. For more information, see the net_instance_register(9F) man page.
net_instance_unregister: Remove the set of instances that were registered with net_instance_register(). For more information, see the net_instance_unregister(9F) man page.
net_ispartialchecksum: Indicates whether the specified packet contains headers with only partial checksum values. For more information, see the net_ispartialchecksum(9F) man page.
net_isvalidchecksum: Verify the layer 3 checksum and, in some cases, the layer 4 checksum in the specified packet. For more information, see the net_isvalidchecksum(9F) man page.
net_kstat_create: Allocate and initialize a new kstat(9S) structure for the specified instance of IP. For more information, see the net_kstat_create(9F) man page.
net_kstat_delete: Remove a kstat for the specified instance of IP from the system. For more information, see the net_kstat_delete(9F) man page.
net_lifgetnext: Search all of the logical interfaces that are associated with a physical network interface. For more information, see the net_lifgetnext(9F) man page.
net_phygetnext: Search all of the network interfaces that a network protocol owns. For more information, see the net_phygetnext(9F) man page.
net_phylookup: Attempt to retrieve the specified interface name for a network protocol. For more information, see the net_phylookup(9F) man page.
net_protocol_lookup: Locate an implementation of a network layer protocol. For more information, see the net_protocol_lookup(9F) man page.
net_protocol_notify_register(9F): Register the specified function to be called when there is a change to the specified protocol. For more information, see the net_protocol_notify_register(9F) man page.
net_protocol_release: Indicate that a reference to the specified network protocol is no longer required. For more information, see the net_protocol_release(9F) man page.
net_routeto: Indicate which network interface packets are sent. For more information, see the net_routeto(9F) man page.