vether: Implement a virtual ethernet interface
The vether interface simulates a normal Ethernet interface by encapsulating standard network frames with an Ethernet header, specifically for use as a member in a bridge(4). To use vether the administrator needs to configure an address onto the interface so that packets can be routed to it. An Ethernet header will be prepended and, if the vether interface is a member of a bridge(4), the frame will show up there. Taken from OpenBSD.
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roy
parent
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@ -1,4 +1,4 @@
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# $NetBSD: mi,v 1.1703 2020/09/21 14:03:15 kim Exp $
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# $NetBSD: mi,v 1.1704 2020/09/27 13:31:04 roy Exp $
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#
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# Note: don't delete entries from here - mark them as "obsolete" instead.
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#
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@ -2020,6 +2020,7 @@
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./usr/share/man/cat4/vioscsi.0 man-sys-catman .cat
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./usr/share/man/cat4/virt.0 man-sys-catman .cat
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./usr/share/man/cat4/virtio.0 man-sys-catman .cat
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./usr/share/man/cat4/vether.0 man-sys-catman .cat
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./usr/share/man/cat4/vlan.0 man-sys-catman .cat
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./usr/share/man/cat4/vmmon.0 man-sys-catman .cat
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./usr/share/man/cat4/vmnet.0 man-sys-catman .cat
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@ -5158,6 +5159,7 @@
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./usr/share/man/html4/vioscsi.html man-sys-htmlman html
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./usr/share/man/html4/virt.html man-sys-htmlman html
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./usr/share/man/html4/virtio.html man-sys-htmlman html
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./usr/share/man/html4/vether.html man-sys-htmlman html
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./usr/share/man/html4/vlan.html man-sys-htmlman html
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./usr/share/man/html4/vmmon.html man-sys-htmlman html
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./usr/share/man/html4/vmnet.html man-sys-htmlman html
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@ -8228,6 +8230,7 @@
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./usr/share/man/man4/vioscsi.4 man-sys-man .man
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./usr/share/man/man4/virt.4 man-sys-man .man
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./usr/share/man/man4/virtio.4 man-sys-man .man
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./usr/share/man/man4/vether.4 man-sys-man .man
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./usr/share/man/man4/vlan.4 man-sys-man .man
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./usr/share/man/man4/vmmon.4 man-sys-man .man
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./usr/share/man/man4/vmnet.4 man-sys-man .man
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@ -1,4 +1,4 @@
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# $NetBSD: Makefile,v 1.708 2020/09/08 10:05:47 yamaguchi Exp $
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# $NetBSD: Makefile,v 1.709 2020/09/27 13:31:04 roy Exp $
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# @(#)Makefile 8.1 (Berkeley) 6/18/93
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MAN= aac.4 ac97.4 acardide.4 aceride.4 acphy.4 \
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@ -69,7 +69,7 @@ MAN= aac.4 ac97.4 acardide.4 aceride.4 acphy.4 \
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unix.4 userconf.4 \
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vald.4 valz.4 veriexec.4 vga.4 vge.4 viaide.4 video.4 \
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vio9p.4 vioif.4 viomb.4 viornd.4 vioscsi.4 virt.4 virtio.4 \
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vlan.4 vmmon.4 vmnet.4 vnd.4 voodoofb.4 vr.4 vte.4 \
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vether.4 vlan.4 vmmon.4 vmnet.4 vnd.4 voodoofb.4 vr.4 vte.4 \
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wapbl.4 wb.4 wbsio.4 wd.4 wdc.4 wg.4 wi.4 wm.4 wpi.4 \
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wsbell.4 wscons.4 wsdisplay.4 wsfont.4 wskbd.4 wsmouse.4 wsmux.4 \
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xbox.4 xge.4 \
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@ -0,0 +1,57 @@
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.\" $OpenBSD: vether.4,v 1.5 2017/10/17 22:47:58 schwarze Exp $
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.\"
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.\" Copyright (c) 2009 Theo de Raadt <deraadt@openbsd.org>
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.Dd October 17, 2017
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.Dt VETHER 4
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.Os
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.Sh NAME
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.Nm vether
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.Nd virtual Ethernet interface
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.Sh SYNOPSIS
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.Cd "pseudo-device vether"
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.Sh DESCRIPTION
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The
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.Nm
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interface simulates a normal Ethernet interface by encapsulating
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standard network frames with an Ethernet header, specifically
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for use as a member in a
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.Xr bridge 4 .
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.Pp
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To use
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.Nm
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the administrator needs to configure an address onto the interface
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so that packets can be routed to it.
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An Ethernet header will be prepended and, if the
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.Nm
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interface is a member of a
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.Xr bridge 4 ,
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the frame will show up there.
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.Sh SEE ALSO
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.Xr bridge 4 ,
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.Xr ifconfig 8
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.Sh HISTORY
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The
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.Nm
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interface first appeared in
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.Ox 4.7 and
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.Nx 10.
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.Sh AUTHORS
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.An Theo de Raadt Aq Mt deraadt@openbsd.org
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.Sh BUGS
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Like
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.Xr tap 4 ,
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the Ethernet address chosen will be partially random, and may
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occasionally collide with another address.
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@ -1,4 +1,4 @@
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# $NetBSD: files.net,v 1.28 2020/09/13 11:48:45 roy Exp $
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# $NetBSD: files.net,v 1.29 2020/09/27 13:31:04 roy Exp $
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# XXX CLEANUP
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define net
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@ -31,6 +31,7 @@ file net/if_sl.c sl needs-flag
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file net/if_spppsubr.c sppp
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file net/if_tap.c tap
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file net/if_tun.c tun
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file net/if_vether.c vether
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file net/if_vlan.c vlan needs-flag
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file net/if_pppoe.c pppoe needs-flag
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file net/if_wg.c wg needs-flag
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@ -0,0 +1,157 @@
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/* $NetBSD: if_vether.c,v 1.1 2020/09/27 13:31:04 roy Exp $ */
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/* $OpenBSD: if_vether.c,v 1.27 2016/04/13 11:41:15 mpi Exp $ */
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/*
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* Copyright (c) 2009 Theo de Raadt
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* Copyright (c) 2020 Roy Marples
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: if_vether.c,v 1.1 2020/09/27 13:31:04 roy Exp $");
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#include <sys/cprng.h>
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#include <sys/kmem.h>
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#include <sys/mbuf.h>
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#include <net/if.h>
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#include <net/if_ether.h>
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#include <net/bpf.h>
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void vetherattach(int);
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static int vether_ioctl(struct ifnet *, u_long, void *);
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static void vether_start(struct ifnet *);
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static int vether_clone_create(struct if_clone *, int);
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static int vether_clone_destroy(struct ifnet *);
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static void vether_stop(struct ifnet *, int);
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static int vether_init(struct ifnet *);
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struct vether_softc {
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struct ethercom sc_ec;
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};
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struct if_clone vether_cloner =
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IF_CLONE_INITIALIZER("vether", vether_clone_create, vether_clone_destroy);
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void
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vetherattach(int nvether)
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{
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if_clone_attach(&vether_cloner);
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}
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static int
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vether_clone_create(struct if_clone *ifc, int unit)
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{
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struct ifnet *ifp;
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struct vether_softc *sc;
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uint8_t enaddr[ETHER_ADDR_LEN] =
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{ 0xf2, 0x0b, 0xa4, 0xff, 0xff, 0xff };
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sc = kmem_zalloc(sizeof(*sc), KM_SLEEP);
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ifp = &sc->sc_ec.ec_if;
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if_initname(ifp, ifc->ifc_name, unit);
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ifp->if_softc = sc;
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ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
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#ifdef NET_MPSAFE
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ifp->if_extflags = IFEF_MPSAFE;
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#endif
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ifp->if_ioctl = vether_ioctl;
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ifp->if_start = vether_start;
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ifp->if_stop = vether_stop;
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ifp->if_init = vether_init;
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IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
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IFQ_SET_READY(&ifp->if_snd);
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sc->sc_ec.ec_capabilities = ETHERCAP_VLAN_MTU | ETHERCAP_JUMBO_MTU;
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/*
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* In order to obtain unique initial Ethernet address on a host,
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* do some randomisation. It's not meant for anything but avoiding
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* hard-coding an address.
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*/
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cprng_fast(&enaddr[3], 3);
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/* Those steps are mandatory for an Ethernet driver. */
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if_initialize(ifp);
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ether_ifattach(ifp, enaddr);
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if_register(ifp);
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return 0;
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}
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static int
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vether_clone_destroy(struct ifnet *ifp)
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{
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struct vether_softc *sc = ifp->if_softc;
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ether_ifdetach(ifp);
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if_detach(ifp);
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kmem_free(sc, sizeof(*sc));
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return 0;
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}
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static int
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vether_init(struct ifnet *ifp)
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{
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ifp->if_flags |= IFF_RUNNING;
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if_link_state_change(ifp, LINK_STATE_UP);
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vether_start(ifp);
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return 0;
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}
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/*
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* The bridge has magically already done all the work for us,
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* and we only need to discard the packets.
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*/
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static void
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vether_start(struct ifnet *ifp)
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{
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struct mbuf *m;
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for (;;) {
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IFQ_DEQUEUE(&ifp->if_snd, m);
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if (m == NULL)
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break;
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bpf_mtap(ifp, m, BPF_D_OUT);
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m_freem(m);
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if_statinc(ifp, if_opackets);
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}
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}
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static void
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vether_stop(struct ifnet *ifp, __unused int disable)
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{
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ifp->if_flags &= ~IFF_RUNNING;
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if_link_state_change(ifp, LINK_STATE_DOWN);
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}
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static int
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vether_ioctl(struct ifnet *ifp, unsigned long cmd, void *data)
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{
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int error = 0;
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switch (cmd) {
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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break;
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default:
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error = ether_ioctl(ifp, cmd, data);
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}
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return error;
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}
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