NetBSD/sys/net/if_vether.c

158 lines
3.7 KiB
C

/* $NetBSD: if_vether.c,v 1.1 2020/09/27 13:31:04 roy Exp $ */
/* $OpenBSD: if_vether.c,v 1.27 2016/04/13 11:41:15 mpi Exp $ */
/*
* Copyright (c) 2009 Theo de Raadt
* Copyright (c) 2020 Roy Marples
*
* 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_vether.c,v 1.1 2020/09/27 13:31:04 roy Exp $");
#include <sys/cprng.h>
#include <sys/kmem.h>
#include <sys/mbuf.h>
#include <net/if.h>
#include <net/if_ether.h>
#include <net/bpf.h>
void vetherattach(int);
static int vether_ioctl(struct ifnet *, u_long, void *);
static void vether_start(struct ifnet *);
static int vether_clone_create(struct if_clone *, int);
static int vether_clone_destroy(struct ifnet *);
static void vether_stop(struct ifnet *, int);
static int vether_init(struct ifnet *);
struct vether_softc {
struct ethercom sc_ec;
};
struct if_clone vether_cloner =
IF_CLONE_INITIALIZER("vether", vether_clone_create, vether_clone_destroy);
void
vetherattach(int nvether)
{
if_clone_attach(&vether_cloner);
}
static int
vether_clone_create(struct if_clone *ifc, int unit)
{
struct ifnet *ifp;
struct vether_softc *sc;
uint8_t enaddr[ETHER_ADDR_LEN] =
{ 0xf2, 0x0b, 0xa4, 0xff, 0xff, 0xff };
sc = kmem_zalloc(sizeof(*sc), KM_SLEEP);
ifp = &sc->sc_ec.ec_if;
if_initname(ifp, ifc->ifc_name, unit);
ifp->if_softc = sc;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
#ifdef NET_MPSAFE
ifp->if_extflags = IFEF_MPSAFE;
#endif
ifp->if_ioctl = vether_ioctl;
ifp->if_start = vether_start;
ifp->if_stop = vether_stop;
ifp->if_init = vether_init;
IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
IFQ_SET_READY(&ifp->if_snd);
sc->sc_ec.ec_capabilities = ETHERCAP_VLAN_MTU | ETHERCAP_JUMBO_MTU;
/*
* In order to obtain unique initial Ethernet address on a host,
* do some randomisation. It's not meant for anything but avoiding
* hard-coding an address.
*/
cprng_fast(&enaddr[3], 3);
/* Those steps are mandatory for an Ethernet driver. */
if_initialize(ifp);
ether_ifattach(ifp, enaddr);
if_register(ifp);
return 0;
}
static int
vether_clone_destroy(struct ifnet *ifp)
{
struct vether_softc *sc = ifp->if_softc;
ether_ifdetach(ifp);
if_detach(ifp);
kmem_free(sc, sizeof(*sc));
return 0;
}
static int
vether_init(struct ifnet *ifp)
{
ifp->if_flags |= IFF_RUNNING;
if_link_state_change(ifp, LINK_STATE_UP);
vether_start(ifp);
return 0;
}
/*
* The bridge has magically already done all the work for us,
* and we only need to discard the packets.
*/
static void
vether_start(struct ifnet *ifp)
{
struct mbuf *m;
for (;;) {
IFQ_DEQUEUE(&ifp->if_snd, m);
if (m == NULL)
break;
bpf_mtap(ifp, m, BPF_D_OUT);
m_freem(m);
if_statinc(ifp, if_opackets);
}
}
static void
vether_stop(struct ifnet *ifp, __unused int disable)
{
ifp->if_flags &= ~IFF_RUNNING;
if_link_state_change(ifp, LINK_STATE_DOWN);
}
static int
vether_ioctl(struct ifnet *ifp, unsigned long cmd, void *data)
{
int error = 0;
switch (cmd) {
case SIOCADDMULTI:
case SIOCDELMULTI:
break;
default:
error = ether_ioctl(ifp, cmd, data);
}
return error;
}