File: [local] / src / sys / net / if_gif.c (download)
Revision 1.31, Tue Dec 16 20:33:25 2003 UTC (20 years, 5 months ago) by markus
Branch: MAIN
CVS Tags: SMP_SYNC_B, SMP_SYNC_A, OPENBSD_3_7_BASE, OPENBSD_3_7, OPENBSD_3_6_BASE, OPENBSD_3_6, OPENBSD_3_5_BASE, OPENBSD_3_5 Changes since 1.30: +5 -4 lines
return error in ifc_destroy; ok deraadt, itojun, cedric, hshoexer
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/* $OpenBSD: if_gif.c,v 1.31 2003/12/16 20:33:25 markus Exp $ */
/* $KAME: if_gif.c,v 1.43 2001/02/20 08:51:07 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/bpf.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_gif.h>
#endif /* INET */
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_gif.h>
#endif /* INET6 */
#include <net/if_gif.h>
#include "bpfilter.h"
#include "bridge.h"
extern int ifqmaxlen;
void gifattach(int);
int gif_clone_create(struct if_clone *, int);
int gif_clone_destroy(struct ifnet *);
/*
* gif global variable definitions
*/
struct gif_softc_head gif_softc_list;
struct if_clone gif_cloner =
IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy);
/* ARGSUSED */
void
gifattach(count)
int count;
{
LIST_INIT(&gif_softc_list);
if_clone_attach(&gif_cloner);
}
int
gif_clone_create(ifc, unit)
struct if_clone *ifc;
int unit;
{
struct gif_softc *sc;
int s;
sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT);
if (!sc)
return (ENOMEM);
bzero(sc, sizeof(*sc));
snprintf(sc->gif_if.if_xname, sizeof sc->gif_if.if_xname,
"%s%d", ifc->ifc_name, unit);
sc->gif_if.if_mtu = GIF_MTU;
sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
sc->gif_if.if_ioctl = gif_ioctl;
sc->gif_if.if_start = gif_start;
sc->gif_if.if_output = gif_output;
sc->gif_if.if_type = IFT_GIF;
sc->gif_if.if_snd.ifq_maxlen = ifqmaxlen;
sc->gif_if.if_softc = sc;
if_attach(&sc->gif_if);
if_alloc_sadl(&sc->gif_if);
#if NBPFILTER > 0
bpfattach(&sc->gif_if.if_bpf, &sc->gif_if, DLT_NULL,
sizeof(u_int));
#endif
s = splnet();
LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list);
splx(s);
return (0);
}
int
gif_clone_destroy(ifp)
struct ifnet *ifp;
{
struct gif_softc *sc = ifp->if_softc;
int s;
s = splnet();
LIST_REMOVE(sc, gif_list);
splx(s);
#if NBPFILTER > 0
bpfdetach(ifp);
#endif
if_detach(ifp);
if (sc->gif_psrc)
free((caddr_t)sc->gif_psrc, M_IFADDR);
sc->gif_psrc = NULL;
if (sc->gif_pdst)
free((caddr_t)sc->gif_pdst, M_IFADDR);
sc->gif_pdst = NULL;
free(sc, M_DEVBUF);
return (0);
}
void
gif_start(ifp)
struct ifnet *ifp;
{
#if NBRIDGE > 0
struct sockaddr dst;
#endif /* NBRIDGE */
struct mbuf *m;
int s;
#if NBRIDGE > 0
bzero(&dst, sizeof(dst));
/*
* XXX The assumption here is that only the ethernet bridge
* uses the start routine of this interface, and it's thus
* safe to do this.
*/
dst.sa_family = AF_LINK;
#endif /* NBRIDGE */
for (;;) {
s = splimp();
IF_DEQUEUE(&ifp->if_snd, m);
splx(s);
if (m == NULL) return;
#if NBRIDGE > 0
/* Sanity check -- interface should be member of a bridge */
if (ifp->if_bridge == NULL) m_freem(m);
else gif_output(ifp, m, &dst, NULL);
#else
m_freem(m);
#endif /* NBRIDGE */
}
}
int
gif_output(ifp, m, dst, rt)
struct ifnet *ifp;
struct mbuf *m;
struct sockaddr *dst;
struct rtentry *rt; /* added in net2 */
{
struct gif_softc *sc = (struct gif_softc*)ifp;
int error = 0;
struct m_tag *mtag;
if (!(ifp->if_flags & IFF_UP) ||
sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
m_freem(m);
error = ENETDOWN;
goto end;
}
/*
* gif may cause infinite recursion calls when misconfigured.
* We'll prevent this by detecting loops.
*/
for (mtag = m_tag_find(m, PACKET_TAG_GIF, NULL); mtag;
mtag = m_tag_find(m, PACKET_TAG_GIF, mtag)) {
if (!bcmp((caddr_t)(mtag + 1), &ifp, sizeof(struct ifnet *))) {
IF_DROP(&ifp->if_snd);
log(LOG_NOTICE,
"gif_output: recursively called too many times\n");
m_freem(m);
error = EIO; /* is there better errno? */
goto end;
}
}
mtag = m_tag_get(PACKET_TAG_GIF, sizeof(struct ifnet *), M_NOWAIT);
if (mtag == NULL) {
IF_DROP(&ifp->if_snd);
m_freem(m);
error = ENOMEM;
goto end;
}
bcopy(&ifp, (caddr_t)(mtag + 1), sizeof(struct ifnet *));
m_tag_prepend(m, mtag);
m->m_flags &= ~(M_BCAST|M_MCAST);
#if NBPFILTER > 0
if (ifp->if_bpf) {
/*
* We need to prepend the address family as
* a four byte field. Cons up a dummy header
* to pacify bpf. This is safe because bpf
* will only read from the mbuf (i.e., it won't
* try to free it or keep a pointer a to it).
*/
struct mbuf m0;
u_int32_t af = dst->sa_family;
m0.m_flags = 0;
m0.m_next = m;
m0.m_len = 4;
m0.m_data = (char *)⁡
bpf_mtap(ifp->if_bpf, &m0);
}
#endif
ifp->if_opackets++;
ifp->if_obytes += m->m_pkthdr.len;
switch (sc->gif_psrc->sa_family) {
#ifdef INET
case AF_INET:
error = in_gif_output(ifp, dst->sa_family, m, rt);
break;
#endif
#ifdef INET6
case AF_INET6:
error = in6_gif_output(ifp, dst->sa_family, m, rt);
break;
#endif
default:
m_freem(m);
error = ENETDOWN;
break;
}
end:
if (error)
ifp->if_oerrors++;
return error;
}
int
gif_ioctl(ifp, cmd, data)
struct ifnet *ifp;
u_long cmd;
caddr_t data;
{
struct gif_softc *sc = (struct gif_softc*)ifp;
struct ifreq *ifr = (struct ifreq*)data;
int error = 0, size;
struct sockaddr *dst, *src;
struct sockaddr *sa;
int s;
struct gif_softc *sc2;
switch (cmd) {
case SIOCSIFADDR:
break;
case SIOCSIFDSTADDR:
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
switch (ifr->ifr_addr.sa_family) {
#ifdef INET
case AF_INET: /* IP supports Multicast */
break;
#endif /* INET */
#ifdef INET6
case AF_INET6: /* IP6 supports Multicast */
break;
#endif /* INET6 */
default: /* Other protocols doesn't support Multicast */
error = EAFNOSUPPORT;
break;
}
break;
case SIOCSIFPHYADDR:
#ifdef INET6
case SIOCSIFPHYADDR_IN6:
#endif /* INET6 */
case SIOCSLIFPHYADDR:
switch (cmd) {
#ifdef INET
case SIOCSIFPHYADDR:
src = (struct sockaddr *)
&(((struct in_aliasreq *)data)->ifra_addr);
dst = (struct sockaddr *)
&(((struct in_aliasreq *)data)->ifra_dstaddr);
break;
#endif
#ifdef INET6
case SIOCSIFPHYADDR_IN6:
src = (struct sockaddr *)
&(((struct in6_aliasreq *)data)->ifra_addr);
dst = (struct sockaddr *)
&(((struct in6_aliasreq *)data)->ifra_dstaddr);
break;
#endif
case SIOCSLIFPHYADDR:
src = (struct sockaddr *)
&(((struct if_laddrreq *)data)->addr);
dst = (struct sockaddr *)
&(((struct if_laddrreq *)data)->dstaddr);
break;
default:
return EINVAL;
}
/* sa_family must be equal */
if (src->sa_family != dst->sa_family)
return EINVAL;
/* validate sa_len */
switch (src->sa_family) {
#ifdef INET
case AF_INET:
if (src->sa_len != sizeof(struct sockaddr_in))
return EINVAL;
break;
#endif
#ifdef INET6
case AF_INET6:
if (src->sa_len != sizeof(struct sockaddr_in6))
return EINVAL;
break;
#endif
default:
return EAFNOSUPPORT;
}
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
if (dst->sa_len != sizeof(struct sockaddr_in))
return EINVAL;
break;
#endif
#ifdef INET6
case AF_INET6:
if (dst->sa_len != sizeof(struct sockaddr_in6))
return EINVAL;
break;
#endif
default:
return EAFNOSUPPORT;
}
/* check sa_family looks sane for the cmd */
switch (cmd) {
case SIOCSIFPHYADDR:
if (src->sa_family == AF_INET)
break;
return EAFNOSUPPORT;
#ifdef INET6
case SIOCSIFPHYADDR_IN6:
if (src->sa_family == AF_INET6)
break;
return EAFNOSUPPORT;
#endif /* INET6 */
case SIOCSLIFPHYADDR:
/* checks done in the above */
break;
}
LIST_FOREACH(sc2, &gif_softc_list, gif_list) {
if (sc2 == sc)
continue;
if (!sc2->gif_pdst || !sc2->gif_psrc)
continue;
if (sc2->gif_pdst->sa_family != dst->sa_family ||
sc2->gif_pdst->sa_len != dst->sa_len ||
sc2->gif_psrc->sa_family != src->sa_family ||
sc2->gif_psrc->sa_len != src->sa_len)
continue;
/* can't configure same pair of address onto two gifs */
if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 &&
bcmp(sc2->gif_psrc, src, src->sa_len) == 0) {
error = EADDRNOTAVAIL;
goto bad;
}
/* can't configure multiple multi-dest interfaces */
#define multidest(x) \
(((struct sockaddr_in *)(x))->sin_addr.s_addr == INADDR_ANY)
#ifdef INET6
#define multidest6(x) \
(IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(x))->sin6_addr))
#endif
if (dst->sa_family == AF_INET &&
multidest(dst) && multidest(sc2->gif_pdst)) {
error = EADDRNOTAVAIL;
goto bad;
}
#ifdef INET6
if (dst->sa_family == AF_INET6 &&
multidest6(dst) && multidest6(sc2->gif_pdst)) {
error = EADDRNOTAVAIL;
goto bad;
}
#endif
}
if (sc->gif_psrc)
free((caddr_t)sc->gif_psrc, M_IFADDR);
sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK);
bcopy((caddr_t)src, (caddr_t)sa, src->sa_len);
sc->gif_psrc = sa;
if (sc->gif_pdst)
free((caddr_t)sc->gif_pdst, M_IFADDR);
sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK);
bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len);
sc->gif_pdst = sa;
s = splnet();
ifp->if_flags |= IFF_RUNNING;
if_up(ifp); /* send up RTM_IFINFO */
splx(s);
error = 0;
break;
#ifdef SIOCDIFPHYADDR
case SIOCDIFPHYADDR:
if (sc->gif_psrc) {
free((caddr_t)sc->gif_psrc, M_IFADDR);
sc->gif_psrc = NULL;
}
if (sc->gif_pdst) {
free((caddr_t)sc->gif_pdst, M_IFADDR);
sc->gif_pdst = NULL;
}
/* change the IFF_{UP, RUNNING} flag as well? */
break;
#endif
case SIOCGIFPSRCADDR:
#ifdef INET6
case SIOCGIFPSRCADDR_IN6:
#endif /* INET6 */
if (sc->gif_psrc == NULL) {
error = EADDRNOTAVAIL;
goto bad;
}
src = sc->gif_psrc;
switch (cmd) {
#ifdef INET
case SIOCGIFPSRCADDR:
dst = &ifr->ifr_addr;
size = sizeof(ifr->ifr_addr);
break;
#endif /* INET */
#ifdef INET6
case SIOCGIFPSRCADDR_IN6:
dst = (struct sockaddr *)
&(((struct in6_ifreq *)data)->ifr_addr);
size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
break;
#endif /* INET6 */
default:
error = EADDRNOTAVAIL;
goto bad;
}
if (src->sa_len > size)
return EINVAL;
bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
break;
case SIOCGIFPDSTADDR:
#ifdef INET6
case SIOCGIFPDSTADDR_IN6:
#endif /* INET6 */
if (sc->gif_pdst == NULL) {
error = EADDRNOTAVAIL;
goto bad;
}
src = sc->gif_pdst;
switch (cmd) {
#ifdef INET
case SIOCGIFPDSTADDR:
dst = &ifr->ifr_addr;
size = sizeof(ifr->ifr_addr);
break;
#endif /* INET */
#ifdef INET6
case SIOCGIFPDSTADDR_IN6:
dst = (struct sockaddr *)
&(((struct in6_ifreq *)data)->ifr_addr);
size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
break;
#endif /* INET6 */
default:
error = EADDRNOTAVAIL;
goto bad;
}
if (src->sa_len > size)
return EINVAL;
bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
break;
case SIOCGLIFPHYADDR:
if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
error = EADDRNOTAVAIL;
goto bad;
}
/* copy src */
src = sc->gif_psrc;
dst = (struct sockaddr *)
&(((struct if_laddrreq *)data)->addr);
size = sizeof(((struct if_laddrreq *)data)->addr);
if (src->sa_len > size)
return EINVAL;
bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
/* copy dst */
src = sc->gif_pdst;
dst = (struct sockaddr *)
&(((struct if_laddrreq *)data)->dstaddr);
size = sizeof(((struct if_laddrreq *)data)->dstaddr);
if (src->sa_len > size)
return EINVAL;
bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
break;
case SIOCSIFFLAGS:
/* if_ioctl() takes care of it */
break;
case SIOCSIFMTU:
ifp->if_mtu = ((struct ifreq *)data)->ifr_mtu;
break;
default:
error = EINVAL;
break;
}
bad:
return error;
}