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/* $OpenBSD: if_mpe.c,v 1.12 2008/10/28 01:16:14 michele Exp $ */
/*
* Copyright (c) 2008 Pierre-Yves Ritschard <pyr@spootnik.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 "mpe.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_types.h>
#include <net/netisr.h>
#include <net/route.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/nd6.h>
#endif /* INET6 */
#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <netmpls/mpls.h>
#ifdef MPLS_DEBUG
#define DPRINTF(x) do { if (mpedebug) printf x ; } while (0)
#else
#define DPRINTF(x)
#endif
void mpeattach(int);
int mpeoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
int mpeioctl(struct ifnet *, u_long, caddr_t);
void mpestart(struct ifnet *);
int mpe_clone_create(struct if_clone *, int);
int mpe_clone_destroy(struct ifnet *);
LIST_HEAD(, mpe_softc) mpeif_list;
struct if_clone mpe_cloner =
IF_CLONE_INITIALIZER("mpe", mpe_clone_create, mpe_clone_destroy);
void
mpeattach(int nmpe)
{
LIST_INIT(&mpeif_list);
if_clone_attach(&mpe_cloner);
}
int
mpe_clone_create(struct if_clone *ifc, int unit)
{
struct ifnet *ifp;
struct mpe_softc *mpeif;
int s;
if ((mpeif = malloc(sizeof(*mpeif),
M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
return (ENOMEM);
mpeif->sc_shim.shim_label = MPLS_BOS_MASK | htonl(mpls_defttl);
mpeif->sc_unit = unit;
ifp = &mpeif->sc_if;
snprintf(ifp->if_xname, sizeof ifp->if_xname, "mpe%d", unit);
ifp->if_flags = IFF_POINTOPOINT;
ifp->if_softc = mpeif;
ifp->if_mtu = MPE_MTU;
ifp->if_ioctl = mpeioctl;
ifp->if_output = mpeoutput;
ifp->if_start = mpestart;
ifp->if_type = IFT_MPLS;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
ifp->if_hdrlen = MPE_HDRLEN;
IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
IFQ_SET_READY(&ifp->if_snd);
if_attach(ifp);
if_alloc_sadl(ifp);
#if NBPFILTER > 0
bpfattach(&ifp->if_bpf, ifp, DLT_LOOP, MPE_HDRLEN);
#endif
s = splnet();
LIST_INSERT_HEAD(&mpeif_list, mpeif, sc_list);
splx(s);
return (0);
}
int
mpe_clone_destroy(struct ifnet *ifp)
{
struct mpe_softc *mpeif = ifp->if_softc;
int s;
s = splnet();
LIST_REMOVE(mpeif, sc_list);
splx(s);
#if NBPFILTER > 0
bpfdetach(ifp);
#endif
if_detach(ifp);
free(mpeif, M_DEVBUF);
return (0);
}
/*
* Start output on the mpe interface.
*/
void
mpestart(struct ifnet *ifp)
{
struct mbuf *m;
struct mpe_softc *ifm;
struct shim_hdr shim;
int s;
for (;;) {
s = splnet();
IFQ_DEQUEUE(&ifp->if_snd, m);
splx(s);
if (m == NULL)
return;
#if NBPFILTER > 0
if (ifp->if_bpf)
bpf_mtap_af(ifp->if_bpf, AF_INET, m, BPF_DIRECTION_OUT);
#endif
ifm = ifp->if_softc;
shim.shim_label = ifm->sc_shim.shim_label;
M_PREPEND(m, sizeof(shim), M_DONTWAIT);
m_copyback(m, 0, sizeof(shim), (caddr_t)&shim);
if (m == NULL) {
ifp->if_ierrors++;
continue;
}
m->m_pkthdr.rcvif = ifp;
mpls_output(m);
}
}
int
mpeoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
struct rtentry *rt)
{
int s;
int error;
error = 0;
switch (dst->sa_family) {
case AF_INET:
break;
case AF_MPLS:
/*
* drop MPLS packets entering here. This is a hack to prevent
* loops because of misconfiguration.
*/
m_freem(m);
error = ENETUNREACH;
return (error);
default:
error = ENETDOWN;
goto out;
}
s = splnet();
IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error);
if (error) {
/* mbuf is already freed */
splx(s);
return (error);
}
if_start(ifp);
splx(s);
out:
if (error)
ifp->if_oerrors++;
return (error);
}
/* ARGSUSED */
int
mpeioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
int error;
struct mpe_softc *ifm;
struct ifreq *ifr;
struct shim_hdr shim;
u_int32_t ttl = htonl(mpls_defttl);
ifr = (struct ifreq *)data;
error = 0;
switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
break;
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP)
ifp->if_flags |= IFF_RUNNING;
else
ifp->if_flags &= ~IFF_RUNNING;
break;
case SIOCSIFMTU:
if (ifr->ifr_mtu < MPE_MTU_MIN ||
ifr->ifr_mtu > MPE_MTU_MAX)
error = EINVAL;
else
ifp->if_mtu = ifr->ifr_mtu;
break;
case SIOCGETLABEL:
ifm = ifp->if_softc;
shim.shim_label =
((ntohl(ifm->sc_shim.shim_label & MPLS_LABEL_MASK)) >>
MPLS_LABEL_OFFSET);
error = copyout(&shim, ifr->ifr_data, sizeof(shim));
break;
case SIOCSETLABEL:
ifm = ifp->if_softc;
if ((error = copyin(ifr->ifr_data, &shim, sizeof(shim))))
break;
if (shim.shim_label > MPLS_LABEL_MAX ||
shim.shim_label <= MPLS_LABEL_RESERVED_MAX) {
error = EINVAL;
break;
}
shim.shim_label = (htonl(shim.shim_label << MPLS_LABEL_OFFSET))
| MPLS_BOS_MASK | ttl;
if (ifm->sc_shim.shim_label == shim.shim_label)
break;
LIST_FOREACH(ifm, &mpeif_list, sc_list) {
if (ifm != ifp->if_softc &&
ifm->sc_shim.shim_label == shim.shim_label) {
error = EEXIST;
break;
}
}
if (error)
break;
ifm = ifp->if_softc;
ifm->sc_shim.shim_label = shim.shim_label;
break;
default:
return (ENOTTY);
}
return (error);
}
void
mpe_input(struct mbuf *m, struct ifnet *ifp, struct sockaddr_mpls *smpls,
u_int32_t ttl)
{
int s;
/* fixup ttl */
/* label -> AF lookup */
#if NBPFILTER > 0
if (ifp && ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_OUT);
#endif
s = splnet();
IF_ENQUEUE(&ipintrq, m);
schednetisr(NETISR_IP);
splx(s);
}
void
mpe_input6(struct mbuf *m, struct ifnet *ifp, struct sockaddr_mpls *smpls,
u_int32_t ttl)
{
int s;
/* fixup ttl */
/* label -> AF lookup */
#if NBPFILTER > 0
if (ifp && ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_OUT);
#endif
s = splnet();
IF_ENQUEUE(&ip6intrq, m);
schednetisr(NETISR_IPV6);
splx(s);
}
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