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.\" $OpenBSD: rtable_walk.9,v 1.1 2019/07/12 16:53:57 mpi Exp $
.\"
.\" Copyright (c) 2019 Martin Pieuchot <mpi@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.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: July 12 2019 $
.Dt RTABLE_WALK 9
.Os
.Sh NAME
.Nm rtable_walk
.Nd iterate over a routing table
.Sh SYNOPSIS
.In net/rtable.h
.Ft int
.Fo rtable_walk
.Fa "unsigned int rtableid"
.Fa "sa_family_t af"
.Fa "struct rtentry **prt"
.Fa "int (*func)(struct rtentry *, void *, unsigned int)"
.Fa "void *arg"
.Fc
.Sh DESCRIPTION
The
.Fn rtable_walk
function iterates over the routing table
.Fa rtableid
and applies
.Fa func
to all entries of address family
.Fa af .
.Pp
The iteration is interrupted as soon as
.Fa func
returns a non-zero value.
If
.Fa prt
is not
.Dv NULL
when the iteration is interrupted, it is set to the current
routing entry.
In that case
.Fn rtfree
must be called on the routing entry pointed to by
.Fa prt .
.Sh CONTEXT
.Fn rtable_walk
can be called during autoconf or from process context.
.Sh RETURN VALUES
.Fn rtable_walk
returns any non-zero value returned by
.Fa func .
It may also fail with:
.Pp
.Bl -tag -width Er -compact
.It Bq Er EAFNOSUPPORT
A routing table with ID of
.Fa rtableid
and address family of
.Fa af
doesn't exist.
.El
.Sh SEE ALSO
.Xr rtfree 9
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