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1fdb6e6c69
freebsd/sys/net/if_gif.c
Yoshinobu Inoue 4739b8076f IPv6 6to4 support. 
Now most big problem of IPv6 is getting IPv6 address
   assignment.
   6to4 solve the problem. 6to4 addr is defined like below,

          2002: 4byte v4 addr : 2byte SLA ID : 8byte interface ID

   The most important point of the address format is that an IPv4 addr
   is embeded in it. So any user who has IPv4 addr can get IPv6 address
   block with 2byte subnet space. Also, the IPv4 addr is used for
   semi-automatic IPv6 over IPv4 tunneling.

   With 6to4, getting IPv6 addr become dramatically easy.
   The attached patch enable 6to4 extension, and confirmed to work,
   between "Richard Seaman, Jr." <dick@tar.com> and me.

Approved by: jkh

Reviewed by: itojun
2000-03-11 11:17:24 +00:00

487 lines
11 KiB
C
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/*
* 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.
*
* $FreeBSD$
*/
/*
* gif.c
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/syslog.h>
#include <machine/cpu.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/in_gif.h>
#endif /* INET */
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_gif.h>
#endif /* INET6 */
#include <net/if_gif.h>
#include "gif.h"
#include <net/net_osdep.h>
void gifattach __P((void *));
/*
* gif global variable definitions
*/
int ngif = NGIF + 1; /* number of interfaces. +1 for stf. */
struct gif_softc *gif = 0;
void
gifattach(dummy)
void *dummy;
{
register struct gif_softc *sc;
register int i;
gif = sc = malloc (ngif * sizeof(struct gif_softc), M_DEVBUF, M_WAIT);
bzero(sc, ngif * sizeof(struct gif_softc));
for (i = 0; i < ngif - 1; sc++, i++) { /* leave last one for stf */
sc->gif_if.if_name = "gif";
sc->gif_if.if_unit = i;
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_output = gif_output;
sc->gif_if.if_type = IFT_GIF;
sc->gif_if.if_snd.ifq_maxlen = ifqmaxlen;
if_attach(&sc->gif_if);
bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int));
}
sc->gif_if.if_name = "stf";
sc->gif_if.if_unit = 0;
sc->gif_if.if_mtu = GIF_MTU;
sc->gif_if.if_flags = IFF_MULTICAST;
sc->gif_if.if_ioctl = gif_ioctl;
sc->gif_if.if_output = gif_output;
sc->gif_if.if_type = IFT_GIF;
sc->gif_if.if_snd.ifq_maxlen = ifqmaxlen;
if_attach(&sc->gif_if);
bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int));
}
PSEUDO_SET(gifattach, if_gif);
int
gif_output(ifp, m, dst, rt)
struct ifnet *ifp;
struct mbuf *m;
struct sockaddr *dst;
struct rtentry *rt; /* added in net2 */
{
register struct gif_softc *sc = (struct gif_softc*)ifp;
int error = 0;
static int called = 0; /* XXX: MUTEX */
int calllimit = 10; /* XXX: adhoc */
/*
* gif may cause infinite recursion calls when misconfigured.
* We'll prevent this by introducing upper limit.
* XXX: this mechanism may introduce another problem about
* mutual exclusion of the variable CALLED, especially if we
* use kernel thread.
*/
if (++called >= calllimit) {
log(LOG_NOTICE,
"gif_output: recursively called too many times(%d)\n",
called);
m_freem(m);
error = EIO; /* is there better errno? */
goto end;
}
getmicrotime(&ifp->if_lastchange);
m->m_flags &= ~(M_BCAST|M_MCAST);
if (!(ifp->if_flags & IFF_UP) ||
sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
m_freem(m);
error = ENETDOWN;
goto end;
}
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_int af = dst->sa_family;
m0.m_next = m;
m0.m_len = 4;
m0.m_data = (char *)&af;
bpf_mtap(ifp, &m0);
}
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;
}
end:
called = 0; /* reset recursion counter */
if (error) ifp->if_oerrors++;
return error;
}
void
gif_input(m, af, gifp)
struct mbuf *m;
int af;
struct ifnet *gifp;
{
int s, isr;
register struct ifqueue *ifq = 0;
if (gifp == NULL) {
/* just in case */
m_freem(m);
return;
}
if (m->m_pkthdr.rcvif)
m->m_pkthdr.rcvif = gifp;
if (gifp->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_int af = AF_INET6;
m0.m_next = m;
m0.m_len = 4;
m0.m_data = (char *)&af;
bpf_mtap(gifp, &m0);
}
/*
* Put the packet to the network layer input queue according to the
* specified address family.
* Note: older versions of gif_input directly called network layer
* input functions, e.g. ip6_input, here. We changed the policy to
* prevent too many recursive calls of such input functions, which
* might cause kernel panic. But the change may introduce another
* problem; if the input queue is full, packets are discarded.
* We believed it rarely occurs and changed the policy. If we find
* it occurs more times than we thought, we may change the policy
* again.
*/
switch (af) {
#ifdef INET
case AF_INET:
ifq = &ipintrq;
isr = NETISR_IP;
break;
#endif
#ifdef INET6
case AF_INET6:
ifq = &ip6intrq;
isr = NETISR_IPV6;
break;
#endif
default:
m_freem(m);
return;
}
s = splimp();
if (IF_QFULL(ifq)) {
IF_DROP(ifq); /* update statistics */
m_freem(m);
splx(s);
return;
}
IF_ENQUEUE(ifq, m);
/* we need schednetisr since the address family may change */
schednetisr(isr);
gifp->if_ipackets++;
gifp->if_ibytes += m->m_pkthdr.len;
splx(s);
return;
}
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 *sa, *dst, *src;
switch (cmd) {
case SIOCSIFADDR:
break;
case SIOCSIFDSTADDR:
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
break;
case SIOCGIFMTU:
break;
case SIOCSIFMTU:
{
u_long mtu;
mtu = ifr->ifr_mtu;
if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) {
return (EINVAL);
}
ifp->if_mtu = mtu;
}
break;
case SIOCSIFPHYADDR:
#ifdef INET6
case SIOCSIFPHYADDR_IN6:
#endif /* INET6 */
switch (ifr->ifr_addr.sa_family) {
#ifdef INET
case AF_INET:
src = (struct sockaddr *)
&(((struct in_aliasreq *)data)->ifra_addr);
dst = (struct sockaddr *)
&(((struct in_aliasreq *)data)->ifra_dstaddr);
/* only one gif can have dst = INADDR_ANY */
#define satosaddr(sa) (((struct sockaddr_in *)(sa))->sin_addr.s_addr)
#ifdef INET6
if (bcmp(ifp->if_name, "stf", 3) == 0)
satosaddr(dst) = INADDR_BROADCAST;
#endif
if (satosaddr(dst) == INADDR_ANY) {
int i;
struct gif_softc *sc2;
for (i = 0, sc2 = gif; i < ngif; i++, sc2++) {
if (sc2 == sc) continue;
if (sc2->gif_pdst &&
satosaddr(sc2->gif_pdst)
== INADDR_ANY) {
error = EADDRNOTAVAIL;
goto bad;
}
}
}
size = sizeof(struct sockaddr_in);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
src = (struct sockaddr *)
&(((struct in6_aliasreq *)data)->ifra_addr);
dst = (struct sockaddr *)
&(((struct in6_aliasreq *)data)->ifra_dstaddr);
/* only one gif can have dst = in6addr_any */
#define satoin6(sa) (&((struct sockaddr_in6 *)(sa))->sin6_addr)
if (IN6_IS_ADDR_UNSPECIFIED(satoin6(dst))) {
int i;
struct gif_softc *sc2;
for (i = 0, sc2 = gif; i < ngif; i++, sc2++) {
if (sc2 == sc) continue;
if (sc2->gif_pdst &&
IN6_IS_ADDR_UNSPECIFIED(
satoin6(sc2->gif_pdst)
)) {
error = EADDRNOTAVAIL;
goto bad;
}
}
}
size = sizeof(struct sockaddr_in6);
break;
#endif /* INET6 */
default:
error = EPROTOTYPE;
goto bad;
break;
}
if (sc->gif_psrc != NULL)
free((caddr_t)sc->gif_psrc, M_IFADDR);
if (sc->gif_pdst != NULL)
free((caddr_t)sc->gif_pdst, M_IFADDR);
sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK);
bzero((caddr_t)sa, size);
bcopy((caddr_t)src, (caddr_t)sa, size);
sc->gif_psrc = sa;
sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK);
bzero((caddr_t)sa, size);
bcopy((caddr_t)dst, (caddr_t)sa, size);
sc->gif_pdst = sa;
ifp->if_flags |= (IFF_UP|IFF_RUNNING);
{
int s;
s = splnet();
if_up(ifp); /* send up RTM_IFINFO */
splx(s);
}
break;
case SIOCGIFPSRCADDR:
#ifdef INET6
case SIOCGIFPSRCADDR_IN6:
#endif /* INET6 */
if (sc->gif_psrc == NULL) {
error = EADDRNOTAVAIL;
goto bad;
}
src = sc->gif_psrc;
switch (sc->gif_psrc->sa_family) {
#ifdef INET
case AF_INET:
dst = &ifr->ifr_addr;
size = sizeof(struct sockaddr_in);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
dst = (struct sockaddr *)
&(((struct in6_ifreq *)data)->ifr_addr);
size = sizeof(struct sockaddr_in6);
break;
#endif /* INET6 */
default:
error = EADDRNOTAVAIL;
goto bad;
}
bcopy((caddr_t)src, (caddr_t)dst, size);
break;
case SIOCGIFPDSTADDR:
#ifdef INET6
case SIOCGIFPDSTADDR_IN6:
#endif /* INET6 */
if (sc->gif_pdst == NULL) {
error = EADDRNOTAVAIL;
goto bad;
}
src = sc->gif_pdst;
switch (sc->gif_pdst->sa_family) {
#ifdef INET
case AF_INET:
dst = &ifr->ifr_addr;
size = sizeof(struct sockaddr_in);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
dst = (struct sockaddr *)
&(((struct in6_ifreq *)data)->ifr_addr);
size = sizeof(struct sockaddr_in6);
break;
#endif /* INET6 */
default:
error = EADDRNOTAVAIL;
goto bad;
}
bcopy((caddr_t)src, (caddr_t)dst, size);
break;
case SIOCSIFFLAGS:
break;
default:
error = EINVAL;
break;
}
bad:
return error;
}
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