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/* $OpenBSD: if_vether.c,v 1.6 2009/11/22 12:33:25 deraadt Exp $ */
/*
* 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.
*/
#include "vether.h"
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/in_var.h>
#endif
#include <dev/rndvar.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#ifdef VETHER_DEBUG
#define DPRINTF(x) do { if (vetherdebug) printf x ; } while (0)
#else
#define DPRINTF(x)
#endif
void vetherattach(int);
int vetherioctl(struct ifnet *, u_long, caddr_t);
void vetherstart(struct ifnet *);
int vether_clone_create(struct if_clone *, int);
int vether_clone_destroy(struct ifnet *);
int vether_media_change(struct ifnet *);
void vether_media_status(struct ifnet *, struct ifmediareq *);
struct vether_softc {
struct arpcom sc_ac;
struct ifmedia sc_media;
LIST_ENTRY(vether_softc) sc_list;
};
LIST_HEAD(, vether_softc) vether_list;
struct if_clone vether_cloner =
IF_CLONE_INITIALIZER("vether", vether_clone_create, vether_clone_destroy);
int
vether_media_change(struct ifnet *ifp)
{
return (0);
}
void
vether_media_status(struct ifnet *ifp, struct ifmediareq *imr)
{
imr->ifm_active = IFM_ETHER | IFM_AUTO;
imr->ifm_status = IFM_AVALID | IFM_ACTIVE;
}
void
vetherattach(int nvether)
{
LIST_INIT(&vether_list);
if_clone_attach(&vether_cloner);
}
int
vether_clone_create(struct if_clone *ifc, int unit)
{
struct ifnet *ifp;
struct vether_softc *sc;
u_int32_t macaddr_rnd;
int s;
if ((sc = malloc(sizeof(*sc),
M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
return (ENOMEM);
/* from if_tun.c: generate fake MAC address: 00 bd xx xx xx unit_no */
sc->sc_ac.ac_enaddr[0] = 0x00;
sc->sc_ac.ac_enaddr[1] = 0xbd;
/*
* This no longer happens pre-scheduler so let's use the real
* random subsystem instead of random().
*/
macaddr_rnd = arc4random();
bcopy(&macaddr_rnd, &sc->sc_ac.ac_enaddr[2], sizeof(u_int32_t));
sc->sc_ac.ac_enaddr[5] = (u_char)unit + 1;
ifp = &sc->sc_ac.ac_if;
snprintf(ifp->if_xname, sizeof ifp->if_xname, "vether%d", unit);
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_softc = sc;
ifp->if_ioctl = vetherioctl;
ifp->if_start = vetherstart;
IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
IFQ_SET_READY(&ifp->if_snd);
ifp->if_capabilities = IFCAP_VLAN_MTU;
ifmedia_init(&sc->sc_media, 0, vether_media_change,
vether_media_status);
ifmedia_add(&sc->sc_media, IFM_ETHER | IFM_AUTO, 0, NULL);
ifmedia_set(&sc->sc_media, IFM_ETHER | IFM_AUTO);
if_attach(ifp);
ether_ifattach(ifp);
s = splnet();
LIST_INSERT_HEAD(&vether_list, sc, sc_list);
splx(s);
return (0);
}
int
vether_clone_destroy(struct ifnet *ifp)
{
struct vether_softc *sc = ifp->if_softc;
int s;
s = splnet();
LIST_REMOVE(sc, sc_list);
splx(s);
ether_ifdetach(ifp);
if_detach(ifp);
free(sc, M_DEVBUF);
return (0);
}
/*
* The bridge has magically already done all the work for us,
* and we only need to discard the packets.
*/
void
vetherstart(struct ifnet *ifp)
{
struct mbuf *m;
int s;
for (;;) {
s = splnet();
IFQ_DEQUEUE(&ifp->if_snd, m);
splx(s);
if (m == NULL)
return;
ifp->if_opackets++;
m_freem(m);
}
}
/* ARGSUSED */
int
vetherioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct vether_softc *sc = (struct vether_softc *)ifp->if_softc;
struct ifaddr *ifa = (struct ifaddr *)data;
struct ifreq *ifr = (struct ifreq *)data;
int error = 0, link_state;
ifr = (struct ifreq *)data;
switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
#ifdef INET
if (ifa->ifa_addr->sa_family == AF_INET)
arp_ifinit(&sc->sc_ac, ifa);
#endif
/* FALLTHROUGH */
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP) {
ifp->if_flags |= IFF_RUNNING;
link_state = LINK_STATE_UP;
} else {
ifp->if_flags &= ~IFF_RUNNING;
link_state = LINK_STATE_DOWN;
}
if (ifp->if_link_state != link_state) {
ifp->if_link_state = link_state;
if_link_state_change(ifp);
}
break;
case SIOCGIFMEDIA:
case SIOCSIFMEDIA:
error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd);
break;
default:
error = ether_ioctl(ifp, &sc->sc_ac, cmd, data);
}
return (error);
}
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