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change rt_ifa_add and rt_ifa_del so they take an rdomain argument.

this allows mpls interfaces (mpe, mpw) to pass the rdomain they
wish the local label to be in, rather than have it implicitly forced
to 0 by these functions. right now they'll pass 0, but it will soon
be possible to have them rx packets in other rdomains.

previously the functions used ifp->if_rdomain for the rdomain.
everything other than mpls still passes ifp->if_rdomain.

ok mpi@

.\"	$OpenBSD: rt_ifa_add.9,v 1.6 2019/02/13 23:47:43 dlg Exp $
.\"
.\" Copyright (c) 2014 Martin Pieuchot
.\"
.\" 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: February 13 2019 $
.Dt RT_IFA_ADD 9
.Os
.Sh NAME
.Nm rt_ifa_add ,
.Nm rt_ifa_del ,
.Nm rt_ifa_addlocal ,
.Nm rt_ifa_dellocal
.Nd add or delete routing entries associated with an address
.Sh SYNOPSIS
.In sys/types.h
.In sys/socket.h
.In net/if.h
.In net/route.h
.Ft int
.Fo rt_ifa_add
.Fa "struct ifaddr *ifa"
.Fa "int flags"
.Fa "struct sockaddr *dst"
.Fa "unsigned int rdomain"
.Fc
.Ft int
.Fo rt_ifa_del
.Fa "struct ifaddr *ifa"
.Fa "int flags"
.Fa "struct sockaddr *dst"
.Fa "unsigned int rdomain"
.Fc
.Ft int
.Fn rt_ifa_addlocal "struct ifaddr *ifa"
.Ft int
.Fn rt_ifa_dellocal "struct ifaddr *ifa"
.Sh DESCRIPTION
These functions create and delete routing entries required by the network
stack and managed by the kernel.
.Bl -tag -width rt_ifa_addlocalxx
.It Fn rt_ifa_add
Creates and associates a connected routing entry with
.Fa ifa
in the routing domain specified by
.Fa rdomain .
.Pp
Connected routing entries represent routes to prefixes and should be created
with
.Dv RTF_CLONING
in
.Fa flags
and the address of
.Fa ifa
in
.Fa dst .
But for Point-to-Point interfaces, connected routing entries represent routes
to hosts and should be created
with
.Dv RTF_HOST
in
.Fa flags
and the destination address in
.Fa dst .
Connected routing entries have a priority of
.Dv RTP_CONNECTED .
.It Fn rt_ifa_del
Removes the connected routing entry associated with
.Fa ifa
in the routing domain specified by
.Fa rdomain .
.It Fn rt_ifa_addlocal
Creates and associates a local routing entry
with
.Fa ifa .
.Pp
Local routing entries are used to not send packets destined to a local
address on the wire and instead redirect them to
.Xr lo 4 .
They have the lowest priority available,
.Dv RTP_LOCAL ,
and contain a special flag,
.Dv RTF_LOCAL ,
that can be checked to determine if the address is configured on the system.
.It Fn rt_ifa_dellocal
Removes the local routing entry associated with
.Fa ifa .
.El
.Sh CONTEXT
.Fn rt_ifa_add ,
.Fn rt_ifa_del ,
.Fn rt_ifa_addlocal ,
and
.Fn rt_ifa_dellocal
can be called during autoconf, from process context, or from interrupt context.
.Sh RETURN VALUES
.Fn rt_ifa_add ,
.Fn rt_ifa_del ,
.Fn rt_ifa_addlocal ,
and
.Fn rt_ifa_dellocal
will return
.Dv 0
on success and the return value of
.Xr rtrequest 9
otherwise.
.Sh SEE ALSO
.Xr lo 4 ,
.Xr route 4 ,
.Xr rtrequest 9