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/* $OpenBSD: if_enc.c,v 1.49 2010/06/29 21:28:37 reyk Exp $ */
/*
* Copyright (c) 2010 Reyk Floeter <reyk@vantronix.net>
*
* 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 "enc.h"
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <net/if.h>
#include <net/if_enc.h>
#include <net/if_types.h>
#include <net/route.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
TAILQ_HEAD(__enchead, enc_softc) enc_list; /* all enc interfaces */
struct ifnet **enc_ifps; /* rdomain-mapped enc ifs */
u_int enc_max_id;
void encattach(int);
int enc_clone_create(struct if_clone *, int);
int enc_clone_destroy(struct ifnet *);
void enc_start(struct ifnet *);
int enc_output(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
int enc_ioctl(struct ifnet *, u_long, caddr_t);
int enc_setif(struct ifnet *, u_int);
void enc_unsetif(struct ifnet *);
struct if_clone enc_cloner =
IF_CLONE_INITIALIZER("enc", enc_clone_create, enc_clone_destroy);
void
encattach(int count)
{
TAILQ_INIT(&enc_list);
/* Create enc0 by default */
(void)enc_clone_create(&enc_cloner, 0);
if_clone_attach(&enc_cloner);
}
int
enc_clone_create(struct if_clone *ifc, int unit)
{
struct enc_softc *sc;
struct ifnet *ifp;
if ((sc = malloc(sizeof(struct enc_softc),
M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
return (ENOMEM);
sc->sc_unit = unit;
ifp = &sc->sc_if;
ifp->if_softc = sc;
ifp->if_type = IFT_ENC;
ifp->if_start = enc_start;
ifp->if_output = enc_output;
ifp->if_ioctl = enc_ioctl;
ifp->if_hdrlen = ENC_HDRLEN;
snprintf(ifp->if_xname, sizeof(ifp->if_xname), "%s%d",
ifc->ifc_name, unit);
if_attach(ifp);
if_alloc_sadl(ifp);
#if NBPFILTER > 0
bpfattach(&ifp->if_bpf, ifp, DLT_ENC, ENC_HDRLEN);
#endif
if (enc_setif(ifp, 0) != 0) {
if_detach(ifp);
free(sc, M_DEVBUF);
return (-1);
}
TAILQ_INSERT_TAIL(&enc_list, sc, sc_entry);
return (0);
}
int
enc_clone_destroy(struct ifnet *ifp)
{
struct enc_softc *sc = ifp->if_softc;
int s;
/* Protect users from removing enc0 */
if (sc->sc_unit == 0)
return (EPERM);
s = splnet();
TAILQ_REMOVE(&enc_list, sc, sc_entry);
enc_unsetif(ifp);
if_detach(ifp);
free(sc, M_DEVBUF);
splx(s);
return (0);
}
void
enc_start(struct ifnet *ifp)
{
struct mbuf *m;
for (;;) {
IF_DROP(&ifp->if_snd);
IF_DEQUEUE(&ifp->if_snd, m);
if (m == NULL)
break;
m_freem(m);
}
}
int
enc_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
struct rtentry *rt)
{
m_freem(m); /* drop packet */
return (0);
}
int
enc_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct ifreq *ifr = (struct ifreq *)data;
int error = 0;
switch (cmd) {
case SIOCAIFADDR:
case SIOCSIFADDR:
case SIOCSIFDSTADDR:
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP)
ifp->if_flags |= IFF_RUNNING;
else
ifp->if_flags &= ~IFF_RUNNING;
break;
case SIOCSIFRTABLEID:
if ((error = enc_setif(ifp, ifr->ifr_rdomainid)) != 0)
return (error);
/* FALLTHROUGH */
default:
return (ENOTTY);
}
return (0);
}
struct ifnet *
enc_getif(u_int id)
{
if (enc_ifps == NULL)
return (NULL);
else if (id > RT_TABLEID_MAX)
return (NULL);
else if (id > enc_max_id)
return (NULL);
return (enc_ifps[id]);
}
int
enc_setif(struct ifnet *ifp, u_int id)
{
struct ifnet **new;
size_t newlen;
enc_unsetif(ifp);
/*
* There can only be one default encif per rdomain -
* Don't overwrite the existing enc iface that is stored
* for this rdomain, so only the first enc interface that
* was added for this rdomain becomes the default.
*/
if (enc_getif(id) != NULL)
return (0);
if (id > RT_TABLEID_MAX)
return (-1);
if (id == 0 || id > enc_max_id) {
newlen = sizeof(struct ifnet *) * (id + 1);
if ((new = malloc(newlen, M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
return (-1);
if (enc_ifps != NULL) {
memcpy(new, enc_ifps,
sizeof(struct ifnet *) * (enc_max_id + 1));
free(enc_ifps, M_DEVBUF);
}
enc_ifps = new;
enc_max_id = id;
}
enc_ifps[id] = ifp;
/* Indicate that this interface is the rdomain default */
ifp->if_link_state = LINK_STATE_UP;
return (0);
}
void
enc_unsetif(struct ifnet *ifp)
{
u_int id = ifp->if_rdomain;
struct ifnet *oifp;
struct enc_softc *sc;
if ((oifp = enc_getif(id)) == NULL || oifp != ifp)
return;
/* Clear slot for this rdomain */
enc_ifps[id] = NULL;
ifp->if_link_state = LINK_STATE_UNKNOWN;
/*
* Now find the next available encif to be the default interface
* for this rdomain.
*/
TAILQ_FOREACH(sc, &enc_list, sc_entry) {
if (&sc->sc_if == ifp || sc->sc_if.if_rdomain != id)
continue;
enc_ifps[id] = &sc->sc_if;
sc->sc_if.if_link_state = LINK_STATE_UP;
break;
}
}
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