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/* $OpenBSD: if_pair.c,v 1.17 2021/01/13 01:57:31 kn Exp $ */
/*
* Copyright (c) 2015 Reyk Floeter <reyk@openbsd.org>
* 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_media.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
void pairattach(int);
int pairioctl(struct ifnet *, u_long, caddr_t);
void pairstart(struct ifqueue *);
int pair_clone_create(struct if_clone *, int);
int pair_clone_destroy(struct ifnet *);
int pair_media_change(struct ifnet *);
void pair_media_status(struct ifnet *, struct ifmediareq *);
void pair_link_state(struct ifnet *);
struct pair_softc {
struct arpcom sc_ac;
struct ifmedia sc_media;
unsigned int sc_pairedif;
};
struct if_clone pair_cloner =
IF_CLONE_INITIALIZER("pair", pair_clone_create, pair_clone_destroy);
int
pair_media_change(struct ifnet *ifp)
{
return (0);
}
void
pair_media_status(struct ifnet *ifp, struct ifmediareq *imr)
{
struct pair_softc *sc = ifp->if_softc;
struct ifnet *pairedifp;
imr->ifm_active = IFM_ETHER | IFM_AUTO;
if ((pairedifp = if_get(sc->sc_pairedif)) == NULL) {
imr->ifm_status = 0;
return;
}
if_put(pairedifp);
imr->ifm_status = IFM_AVALID | IFM_ACTIVE;
}
void
pair_link_state(struct ifnet *ifp)
{
struct pair_softc *sc = ifp->if_softc;
struct ifnet *pairedifp;
unsigned int link_state;
/* The pair state is determined by the paired interface */
if ((pairedifp = if_get(sc->sc_pairedif)) != NULL) {
link_state = LINK_STATE_UP;
if_put(pairedifp);
} else
link_state = LINK_STATE_DOWN;
if (ifp->if_link_state != link_state) {
ifp->if_link_state = link_state;
if_link_state_change(ifp);
}
}
void
pairattach(int npair)
{
if_clone_attach(&pair_cloner);
}
int
pair_clone_create(struct if_clone *ifc, int unit)
{
struct ifnet *ifp;
struct pair_softc *sc;
sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
ifp = &sc->sc_ac.ac_if;
snprintf(ifp->if_xname, sizeof ifp->if_xname, "pair%d", unit);
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ether_fakeaddr(ifp);
ifp->if_softc = sc;
ifp->if_ioctl = pairioctl;
ifp->if_qstart = pairstart;
ifp->if_xflags = IFXF_CLONED | IFXF_MPSAFE;
ifp->if_hardmtu = ETHER_MAX_HARDMTU_LEN;
ifp->if_capabilities = IFCAP_VLAN_MTU;
ifmedia_init(&sc->sc_media, 0, pair_media_change,
pair_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);
pair_link_state(ifp);
return (0);
}
int
pair_clone_destroy(struct ifnet *ifp)
{
struct pair_softc *sc = ifp->if_softc;
struct ifnet *pairedifp;
struct pair_softc *dstsc = ifp->if_softc;
if ((pairedifp = if_get(sc->sc_pairedif)) != NULL) {
dstsc = pairedifp->if_softc;
dstsc->sc_pairedif = 0;
pair_link_state(pairedifp);
if_put(pairedifp);
}
ifmedia_delete_instance(&sc->sc_media, IFM_INST_ANY);
ether_ifdetach(ifp);
if_detach(ifp);
free(sc, M_DEVBUF, sizeof(*sc));
return (0);
}
void
pairstart(struct ifqueue *ifq)
{
struct ifnet *ifp = ifq->ifq_if;
struct pair_softc *sc = (struct pair_softc *)ifp->if_softc;
struct mbuf_list ml = MBUF_LIST_INITIALIZER();
struct ifnet *pairedifp;
struct mbuf *m;
pairedifp = if_get(sc->sc_pairedif);
while ((m = ifq_dequeue(ifq)) != NULL) {
#if NBPFILTER > 0
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_OUT);
#endif /* NBPFILTER > 0 */
if (pairedifp != NULL) {
if (m->m_flags & M_PKTHDR)
m_resethdr(m);
ml_enqueue(&ml, m);
} else
m_freem(m);
}
if (pairedifp != NULL) {
if_input(pairedifp, &ml);
if_put(pairedifp);
}
}
int
pairioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct pair_softc *sc = (struct pair_softc *)ifp->if_softc;
struct ifreq *ifr = (struct ifreq *)data;
struct if_clone *ifc;
struct pair_softc *pairedsc = ifp->if_softc;
struct ifnet *oldifp = NULL, *newifp = NULL;
int error = 0, unit;
switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
/* FALLTHROUGH */
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP)
ifp->if_flags |= IFF_RUNNING;
else
ifp->if_flags &= ~IFF_RUNNING;
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
break;
case SIOCGIFMEDIA:
case SIOCSIFMEDIA:
error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd);
break;
case SIOCSIFPAIR:
if (sc->sc_pairedif == ifr->ifr_index)
break;
/* Cannot link to myself */
if (ifr->ifr_index == ifp->if_index) {
error = EINVAL;
break;
}
oldifp = if_get(sc->sc_pairedif);
newifp = if_get(ifr->ifr_index);
if (newifp != NULL) {
pairedsc = newifp->if_softc;
if (pairedsc->sc_pairedif != 0) {
error = EBUSY;
break;
}
/* Only allow pair(4) interfaces for the pair */
if ((ifc = if_clone_lookup(newifp->if_xname,
&unit)) == NULL || strcmp("pair",
ifc->ifc_name) != 0) {
error = ENODEV;
break;
}
pairedsc->sc_pairedif = ifp->if_index;
sc->sc_pairedif = ifr->ifr_index;
} else
sc->sc_pairedif = 0;
if (oldifp != NULL) {
pairedsc = oldifp->if_softc;
pairedsc->sc_pairedif = 0;
}
break;
case SIOCGIFPAIR:
ifr->ifr_index = sc->sc_pairedif;
break;
default:
error = ether_ioctl(ifp, &sc->sc_ac, cmd, data);
}
if (newifp != NULL || oldifp != NULL)
pair_link_state(ifp);
if (oldifp != NULL) {
pair_link_state(oldifp);
if_put(oldifp);
}
if (newifp != NULL) {
pair_link_state(newifp);
if_put(newifp);
}
return (error);
}
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