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if_vether(4), further developement
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henning.matyschok_outlook.com
Feb 10 2022, 7:14 PM
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if_vether(4), further developement
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Therefore, an updated version:
Index: share/man/man4/Makefile
===================================================================
--- share/man/man4/Makefile
+++ share/man/man4/Makefile
@@ -528,6 +528,7 @@
udplite.4 \
ure.4 \
vale.4 \
+ vether.4 \
vga.4 \
vge.4 \
viapm.4 \
@@ -714,6 +715,7 @@
MLINKS+=ti.4 if_ti.4
MLINKS+=tun.4 if_tun.4
MLINKS+=ure.4 if_ure.4
+MLINKS+=vether.4 if_vether.4
MLINKS+=vge.4 if_vge.4
MLINKS+=vlan.4 if_vlan.4
MLINKS+=vxlan.4 if_vxlan.4
Index: share/man/man4/vether.4
===================================================================
--- /dev/null
+++ share/man/man4/vether.4
@@ -0,0 +1,53 @@
+.\" $OpenBSD: vether.4,v 1.4 2014/01/20 05:07:49 schwarze Exp $
+.\"
+.\" Copyright (c) 2009 Theo de Raadt <deraadt@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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd $Mdocdate: January 20 2014 $
+.Dt VETHER 4
+.Os
+.Sh NAME
+.Nm vether
+.Nd virtual Ethernet interface
+.Sh SYNOPSIS
+.Cd "pseudo-device vether"
+.Sh DESCRIPTION
+The
+.Nm
+interface simulates a normal Ethernet interface by encapsulating
+standard network frames with an Ethernet header, specifically
+for use as a member in a
+.Xr bridge 4 .
+.Pp
+To use
+.Nm
+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
+.Nm
+interface is a member of a
+.Xr bridge 4 ,
+the frame will show up there.
+.Sh SEE ALSO
+.Xr arp 4 ,
+.Xr bridge 4 ,
+.Xr inet 4 ,
+.Xr inet6 4 ,
+.Xr netintro 4 ,
+.Xr ng_ether 4 ,
+.Xr ng_pppoe 4 ,
+.Xr vlan 4 ,
+.Xr ifconfig 8
Index: sys/conf/files
===================================================================
--- sys/conf/files
+++ sys/conf/files
@@ -4060,6 +4060,7 @@
net/if_spppsubr.c optional sppp | netgraph_sppp
net/if_stf.c optional stf inet inet6
net/if_tuntap.c optional tuntap
+net/if_vether.c optional vether
net/if_vlan.c optional vlan
net/if_vxlan.c optional vxlan inet | vxlan inet6
net/ifdi_if.m optional ether pci iflib
Index: sys/modules/Makefile
===================================================================
--- sys/modules/Makefile
+++ sys/modules/Makefile
@@ -157,6 +157,7 @@
${_if_ndis} \
${_if_stf} \
if_tuntap \
+ if_vether \
if_vlan \
if_vxlan \
iflib \
Index: sys/modules/if_vether/Makefile
===================================================================
--- /dev/null
+++ sys/modules/if_vether/Makefile
@@ -0,0 +1,7 @@
+# $FreeBSD$
+
+.PATH: ${SRCTOP}/sys/net
+KMOD= if_vether
+SRCS= if_vether.c
+
+.include <bsd.kmod.mk>
Index: sys/net/if_vether.c
===================================================================
--- /dev/null
+++ sys/net/if_vether.c
@@ -0,0 +1,451 @@
+/*
+ * Copyright (c) 2009 Theo de Raadt
+ *
+ * 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.
+ */
+/*
+ * Copyright (c) 2018, 2021 United States Marine Corps
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+
+#include <net/if.h>
+#include <net/if_var.h>
+#include <net/if_clone.h>
+#include <net/if_dl.h>
+#include <net/if_media.h>
+#include <net/netisr.h>
+#include <net/if_types.h>
+#include <net/bpf.h>
+#include <net/ethernet.h>
+#include <net/if_bridgevar.h>
+#include <net/vnet.h>
+
+/*
+ * Virtual Ethernet interface, ported from OpenBSD. This interface
+ * operates in conjunction with if_bridge(4).
+ */
+
+struct vether_softc {
+ struct ifmedia sc_ifm; /* fake media information */
+ struct ifnet *sc_ifp; /* network interface. */
+};
+#define VETHER_IF_FLAGS (IFF_SIMPLEX|IFF_BROADCAST|IFF_MULTICAST)
+#define VETHER_IFCAP_FLAGS (IFCAP_VLAN_MTU|IFCAP_JUMBO_MTU)
+#define VETHER_IFM_FLAGS (IFM_ETHER|IFM_AUTO)
+
+/*
+ * XXX
+ * The set of protocol-numbers index-set
+ * against <net/netisr.h> maps-to set
+ * over (enum), e. g.:
+ *
+ * typedef enum netisr_proto {
+ * netisr_ip = NETISR_IP,
+ * netisr_igmp = NETISR_IGMP,
+ * netisr_route = NETISR_ROUTE,
+ * netisr_arp = NETISR_ARP,
+ * netisr_ether = NETISR_ETHER,
+ * netisr_ipv6 = NETISR_IPV6,
+ * netisr_epair = NETISR_EPAIR,
+ * netisr_ip_direct = NETISR_IP_DIRECT,
+ * netisr_ipv6_direct = NETISR_IPV6_DIRECT,
+ * netisr_vether = NETISR_VETHER_FWD,
+ * } netisr_proto_t;
+ */
+#define NETISR_VETHER_FWD 11
+
+typedef enum vether_netisr_component {
+ vether_netisr_fwd = NETISR_VETHER_FWD,
+} vether_netisr_component_t;
+
+static void vether_ifaddr_init(struct ifnet *, struct ether_addr *);
+static void vether_nh_fwd_cb(struct mbuf *);
+static void vether_texeof(struct ifnet *);
+
+static void vether_init(void *);
+static void vether_stop(struct ifnet *);
+static void vether_start(struct ifnet *);
+
+static int vether_media_change(struct ifnet *);
+static void vether_media_status(struct ifnet *, struct ifmediareq *);
+static int vether_ioctl(struct ifnet *, u_long, caddr_t);
+
+static int vether_clone_create(struct if_clone *, int, caddr_t);
+static void vether_clone_destroy(struct ifnet *);
+
+static struct netisr_handler vether_nh_fwd = {
+ .nh_name = "Softintr. for if_vether(4)",
+ .nh_handler = vether_nh_fwd_cb,
+ .nh_proto = vether_netisr_fwd,
+ .nh_policy = NETISR_POLICY_FLOW,
+};
+static const char vether_name[] = "vether";
+
+VNET_DEFINE(struct if_clone *, vether_cloner);
+#define V_vether_cloner VNET(vether_cloner)
+
+static int
+vether_clone_create(struct if_clone *ifc, int unit, caddr_t data)
+{
+ struct vether_softc *sc;
+ struct ifnet *ifp;
+ struct ether_addr lla;
+ int error;
+
+ /*
+ * For safety reason, there is a condition test applied -
+ * independently, if M_WAITOK was enabled or not.
+ */
+
+ if ((sc = malloc(sizeof(struct vether_softc),
+ M_DEVBUF, M_WAITOK|M_ZERO)) != NULL) {
+
+ if ((ifp = if_alloc(IFT_ETHER)) != NULL) {
+ sc->sc_ifp = ifp;
+ ifp->if_softc = sc;
+
+ if_initname(ifp, vether_name, unit);
+
+ ifp->if_init = vether_init;
+ ifp->if_ioctl = vether_ioctl;
+ ifp->if_start = vether_start;
+
+ ifp->if_flags = VETHER_IF_FLAGS;
+
+ ifp->if_capabilities = VETHER_IFCAP_FLAGS;
+ ifp->if_capenable = VETHER_IFCAP_FLAGS;
+
+ ifp->if_baudrate = 0;
+
+ ifmedia_init(&sc->sc_ifm, 0, vether_media_change,
+ vether_media_status);
+ ifmedia_add(&sc->sc_ifm, VETHER_IFM_FLAGS, 0, NULL);
+ ifmedia_set(&sc->sc_ifm, VETHER_IFM_FLAGS);
+
+ vether_ifaddr_init(ifp, &lla);
+ ether_ifattach(ifp, lla.octet);
+
+ error = 0;
+ } else {
+ error = ENOSPC;
+ free(sc, M_DEVBUF);
+ }
+ } else
+ error = ENOBUFS;
+
+ return (error);
+}
+
+static void
+vether_clone_destroy(struct ifnet *ifp)
+{
+ struct vether_softc *sc;
+
+ if (ifp != NULL) {
+ ifp->if_flags &= ~IFF_UP;
+
+ vether_stop(ifp);
+
+ if ((sc = ifp->if_softc) != NULL) {
+ free(sc, M_DEVBUF);
+ ifp->if_softc = NULL;
+ }
+ ether_ifdetach(ifp);
+ if_free(ifp);
+ }
+}
+
+static void
+vnet_vether_init(const void *unused __unused)
+{
+
+ V_vether_cloner = if_clone_simple(vether_name,
+ vether_clone_create, vether_clone_destroy, 0);
+}
+VNET_SYSINIT(vnet_vether_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
+ vnet_vether_init, NULL);
+
+static void
+vnet_vether_uninit(const void *unused __unused)
+{
+
+ if_clone_detach(V_vether_cloner);
+}
+VNET_SYSUNINIT(vnet_vether_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
+ vnet_vether_uninit, NULL);
+
+static int
+vether_mod_event(module_t mod, int event, void *data)
+{
+ switch (event) {
+ case MOD_LOAD:
+ netisr_register(&vether_nh_fwd);
+ return (0);
+ case MOD_UNLOAD:
+ netisr_unregister(&vether_nh_fwd);
+ return (0);
+ default:
+ break;
+ }
+ return (EOPNOTSUPP);
+}
+
+static moduledata_t vether_mod = {
+ "if_vether",
+ vether_mod_event,
+ 0,
+};
+DECLARE_MODULE(if_vether, vether_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
+
+/*
+ * I/O.
+ */
+
+static void
+vether_txeof(struct ifnet *ifp)
+{
+ struct mbuf *m;
+
+ if (ifp != NULL) {
+ IFQ_DEQUEUE(&ifp->if_snd, m);
+ if (m != NULL) {
+ BPF_MTAP(ifp, m);
+
+ if ((m->m_flags & M_PKTHDR) != 0) {
+
+ /* do some statistics */
+
+ if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
+ if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
+
+ /* discard, if not member of if_bridge(4) */
+ if (ifp->if_bridge == NULL)
+ m->m_pkthdr.rcvif = ifp;
+
+ /*
+ * Three cases are considered here:
+ *
+ * (a) Frame was tx'd by layer above.
+ *
+ * (b) Frame was rx'd by link-layer.
+ *
+ * (c) Data sink.
+ */
+ if (m->m_pkthdr.rcvif == NULL) {
+ m->m_pkthdr.rcvif = ifp;
+ netisr_dispatch(vether_netisr_fwd, m);
+ } else if (m->m_pkthdr.rcvif != ifp) {
+ m->m_pkthdr.rcvif = ifp;
+
+ /* demultiplex any other frame */
+ (*ifp->if_input)(ifp, m);
+ } else {
+ m_freem(m);
+ m = NULL;
+ }
+
+ } else {
+ if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
+
+ m_freem(m);
+ m = NULL;
+ }
+ vether_txeof(ifp);
+ }
+ }
+}
+
+static void
+vether_start(struct ifnet *ifp)
+{
+ if ((ifp->if_flags & IFF_UP) != 0) {
+ ifp->if_drv_flags |= IFF_DRV_OACTIVE;
+ vether_txeof(ifp);
+ ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
+ }
+}
+
+/*
+ * Broadcast frame by if_bridge(4).
+ */
+
+static void
+vether_nh_fwd_cb(struct mbuf *m)
+{
+ struct ifnet *ifp;
+ int error;
+
+ if (m != NULL) {
+
+ if ((m->m_flags & M_PKTHDR) != 0) {
+
+ if ((ifp = m->m_pkthdr.rcvif) != NULL)
+ BRIDGE_OUTPUT(ifp, m, error);
+ else
+ error = EADDRNOTAVAIL;
+ } else
+ error = ECONNABORTED;
+ } else
+ error = ENOBUFS;
+
+ if (error != 0) {
+
+ if (m != NULL) {
+ m_freem(m);
+ m = NULL;
+ }
+ }
+}
+
+/*
+ * Initialize lla.
+ */
+
+static void
+vether_ifaddr_init(struct ifnet *ifp, struct ether_addr *lla)
+{
+ caddr_t pfx, sfx;
+
+ if (ifp != NULL) {
+
+ if (lla != NULL) {
+ pfx = lla->octet;
+ pfx[0] = 0x02;
+
+ sfx = (pfx + 1);
+ arc4rand(sfx, 5, 0);
+ }
+ }
+}
+
+static int
+vether_media_change(struct ifnet *ifp)
+{
+ int error;
+
+ if (ifp != NULL)
+ error = 0;
+ else
+ error = EADDRNOTAVAIL;
+
+ return (error);
+}
+
+static void
+vether_media_status(struct ifnet *ifp, struct ifmediareq *ifm)
+{
+ if (ifp != NULL) {
+
+ if (ifm != NULL) {
+ ifm->ifm_active = (IFM_ETHER|IFM_AUTO);
+ ifm->ifm_status = (IFM_AVALID|IFM_ACTIVE);
+ }
+ }
+}
+
+static void
+vether_init(void *xsc)
+{
+ struct vether_softc *sc;
+ struct ifnet *ifp;
+
+ if ((sc = (struct vether_softc *)xsc) != NULL) {
+
+ if ((ifp = sc->sc_ifp) != NULL) {
+ ifp->if_drv_flags |= IFF_DRV_RUNNING;
+ ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
+ }
+ }
+}
+
+static void
+vether_stop(struct ifnet *ifp)
+{
+ if (ifp != NULL)
+ ifp->if_drv_flags &= ~(IFF_DRV_RUNNING|IFF_DRV_OACTIVE);
+}
+
+static int
+vether_ioctl(struct ifnet *ifp, u_long req, caddr_t argp)
+{
+ struct vether_softc *sc;
+ struct ifreq *ifr;
+ int error;
+
+ if (ifp != NULL) {
+
+ if ((sc = ifp->if_softc) != NULL) {
+ ifr = (struct ifreq *)argp;
+
+ switch (req) {
+ case SIOCSIFMTU:
+ if (ifr->ifr_mtu < ETHER_MAX_LEN_JUMBO) {
+ ifp->if_mtu = ifr->ifr_mtu;
+ error = 0;
+ } else
+ error = EINVAL;
+ break;
+ case SIOCSIFMEDIA: /* Media types can't be changed. */
+ case SIOCGIFMEDIA:
+ error = ifmedia_ioctl(ifp, ifr, &sc->sc_ifm, req);
+ break;
+ case SIOCSIFFLAGS:
+ case SIOCADDMULTI:
+ case SIOCDELMULTI:
+ error = 0;
+ break;
+ case SIOCSIFPHYS:
+ error = EOPNOTSUPP;
+ break;
+ default:
+ error = ether_ioctl(ifp, req, argp);
+ break;
+ }
+ } else
+ error = ENXIO;
+ } else
+ error = ENOTTY;
+
+ return (error);
+}
+
Henning Andersen Matyschok, 120179M11214, United States Marine Corps, United States Air Force Facility
Wasserlooser Weg 5
Flensburg
24944 Germany

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