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.\"     $OpenBSD: if_addrhook_add.9,v 1.3 2024/02/22 08:10:08 jsg Exp $
.\"
.\"  Copyright (c) 2019 David Gwynne <dlg@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.Dd $Mdocdate: February 22 2024 $
.Dt IF_ADDRHOOK_ADD 9
.Os
.Sh NAME
.Nm if_addrhook_add ,
.Nm if_addrhook_del ,
.\" .Nm if_addrhooks_run ,
.Nm if_detachhook_add ,
.Nm if_detachhook_del ,
.Nm if_linkstatehook_add ,
.Nm if_linkstatehook_del
.Nd interface event hook API
.Sh SYNOPSIS
.In net/if_var.h
.Ft void
.Fn if_addrhook_add "struct ifnet *ifp" "struct task *t"
.Ft void
.Fn if_addrhook_del "struct ifnet *ifp" "struct task *t"
.\" .Ft void
.\" .Fn if_addrhooks_run "struct ifnet *ifp"
.Ft void
.Fn if_detachhook_add "struct ifnet *ifp" "struct task *t"
.Ft void
.Fn if_detachhook_del "struct ifnet *ifp" "struct task *t"
.Ft void
.Fn if_linkstatehook_add "struct ifnet *ifp" "struct task *t"
.Ft void
.Fn if_linkstatehook_del "struct ifnet *ifp" "struct task *t"
.Sh DESCRIPTION
The interface hook API allows for the registration of a task that
will be called when an IP address change, link state, or detach event
occurs on the specified interface.
Tasks should be initialised with
.Xr task_add 9
or
.Xr TASK_INITIALIZER 9
before being used with the following functions.
.Pp
The
.Fn if_addrhook_add
function registers the task
.Fa t
on the
.Fa ifp
interface.
The event will fire every time an IPv4 or IPv6 address change occurs
on the interface until explicitly removed with
.Fn if_addrhook_del .
.Pp
The
.Fn if_addrhook_del
function removes the task
.Fa t
from the
.Fa ifp
interface.
.Pp
The
.Fn if_detachhook_add
function registers the task
.Fa t
on the
.Fa ifp
interface.
The event will fire when the interface is being destroyed.
.Pp
The
.Fn if_detachhook_del
function removes the task
.Fa t
from the
.Fa ifp
interface.
.Pp
The
.Fn if_linkstatehook_add
function registers the task
.Fa t
on the
.Fa ifp
interface.
The event will fire for every link state change, or when the interface
is brought up or down, until explicitly removed with
.Fn if_linkstatehook_del .
.Pp
The
.Fn if_linkstatehook_del
function removes the task
.Fa t
from the
.Fa ifp
interface.
.Sh CONTEXT
.Fn if_addrhook_add ,
.Fn if_addrhook_del ,
.\" .Fn if_addrhooks_run ,
.Fn if_detachhook_add ,
.Fn if_detachhook_del ,
.Fn if_linkstatehook_add ,
and
.Fn if_linkstatehook_del
can be called during autoconf, from process context, or from interrupt context.
.Sh SEE ALSO
.Xr task_set 9