freebsd-dev/sys/netipx/ipx_ip.c

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/*
* Copyright (c) 1995, Mike Mitchell
* Copyright (c) 1984, 1985, 1986, 1987, 1993
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* @(#)ipx_ip.c
*
1999-08-28 01:08:13 +00:00
* $FreeBSD$
*/
/*
* Software interface driver for encapsulating IPX in IP.
*/
#include "opt_inet.h"
#include "opt_ipx.h"
#ifdef IPXIP
#ifndef INET
#error The option IPXIP requires option INET.
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <net/netisr.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#include <netipx/ipx_ip.h>
#include <netipx/ipx_var.h>
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static struct ifnet ipxipif;
/* list of all hosts and gateways or broadcast addrs */
static struct ifnet_en *ipxip_list;
static struct ifnet_en *ipxipattach(void);
static int ipxip_free(struct ifnet *ifp);
static int ipxipioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
static int ipxipoutput(struct ifnet *ifp, struct mbuf *m,
struct sockaddr *dst, struct rtentry *rt);
static void ipxip_rtchange(struct in_addr *dst);
static void ipxipstart(struct ifnet *ifp);
static struct ifnet_en *
ipxipattach()
{
register struct ifnet_en *m;
register struct ifnet *ifp;
if (ipxipif.if_mtu == 0) {
ifp = &ipxipif;
ifp->if_name = "ipxip";
ifp->if_mtu = LOMTU;
ifp->if_ioctl = ipxipioctl;
ifp->if_output = ipxipoutput;
ifp->if_start = ipxipstart;
ifp->if_flags = IFF_POINTOPOINT;
}
MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT | M_ZERO);
if (m == NULL)
return (NULL);
m->ifen_next = ipxip_list;
ipxip_list = m;
ifp = &m->ifen_ifnet;
ifp->if_name = "ipxip";
ifp->if_mtu = LOMTU;
ifp->if_ioctl = ipxipioctl;
ifp->if_output = ipxipoutput;
ifp->if_start = ipxipstart;
ifp->if_flags = IFF_POINTOPOINT;
ifp->if_unit = ipxipif.if_unit++;
if_attach(ifp);
return (m);
}
/*
* Process an ioctl request.
*/
static int
ipxipioctl(ifp, cmd, data)
register struct ifnet *ifp;
u_long cmd;
caddr_t data;
{
int error = 0;
struct ifreq *ifr;
switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
/* fall into: */
case SIOCSIFDSTADDR:
/*
* Everything else is done at a higher level.
*/
break;
case SIOCSIFFLAGS:
ifr = (struct ifreq *)data;
if ((ifr->ifr_flags & IFF_UP) == 0)
error = ipxip_free(ifp);
default:
error = EINVAL;
}
return (error);
}
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static struct mbuf *ipxip_badlen;
static struct mbuf *ipxip_lastin;
static int ipxip_hold_input;
void
ipxip_input(m, hlen)
register struct mbuf *m;
int hlen;
{
register struct ip *ip;
register struct ipx *ipx;
register struct ifqueue *ifq = &ipxintrq;
int len, s;
if (ipxip_hold_input) {
if (ipxip_lastin != NULL) {
m_freem(ipxip_lastin);
}
ipxip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
}
/*
* Get IP and IPX header together in first mbuf.
*/
ipxipif.if_ipackets++;
s = sizeof(struct ip) + sizeof(struct ipx);
if (((m->m_flags & M_EXT) || m->m_len < s) &&
(m = m_pullup(m, s)) == NULL) {
ipxipif.if_ierrors++;
return;
}
ip = mtod(m, struct ip *);
if (ip->ip_hl > (sizeof(struct ip) >> 2)) {
ip_stripoptions(m, (struct mbuf *)NULL);
if (m->m_len < s) {
if ((m = m_pullup(m, s)) == NULL) {
ipxipif.if_ierrors++;
return;
}
ip = mtod(m, struct ip *);
}
}
/*
* Make mbuf data length reflect IPX length.
* If not enough data to reflect IPX length, drop.
*/
m->m_data += sizeof(struct ip);
m->m_len -= sizeof(struct ip);
m->m_pkthdr.len -= sizeof(struct ip);
ipx = mtod(m, struct ipx *);
len = ntohs(ipx->ipx_len);
if (len & 1)
len++; /* Preserve Garbage Byte */
if (ip->ip_len != len) {
if (len > ip->ip_len) {
ipxipif.if_ierrors++;
if (ipxip_badlen)
m_freem(ipxip_badlen);
ipxip_badlen = m;
return;
}
/* Any extra will be trimmed off by the IPX routines */
}
/*
* Deliver to IPX
*/
if (IF_HANDOFF(ifq, m, NULL))
schednetisr(NETISR_IPX);
return;
}
static int
ipxipoutput(ifp, m, dst, rt)
struct ifnet *ifp;
struct mbuf *m;
struct sockaddr *dst;
struct rtentry *rt;
{
register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
register struct ip *ip;
register struct route *ro = &(ifn->ifen_route);
register int len = 0;
register struct ipx *ipx = mtod(m, struct ipx *);
int error;
ifn->ifen_ifnet.if_opackets++;
ipxipif.if_opackets++;
/*
* Calculate data length and make space
* for IP header.
*/
len = ntohs(ipx->ipx_len);
if (len & 1)
len++; /* Preserve Garbage Byte */
/* following clause not necessary on vax */
if (3 & (int)m->m_data) {
/* force longword alignment of ip hdr */
struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
if (m0 == NULL) {
m_freem(m);
return (ENOBUFS);
}
MH_ALIGN(m0, sizeof(struct ip));
m0->m_flags = m->m_flags & M_COPYFLAGS;
m0->m_next = m;
m0->m_len = sizeof(struct ip);
m0->m_pkthdr.len = m0->m_len + m->m_len;
m->m_flags &= ~M_PKTHDR;
m = m0;
} else {
M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
if (m == NULL)
return (ENOBUFS);
}
/*
* Fill in IP header.
*/
ip = mtod(m, struct ip *);
*(long *)ip = 0;
ip->ip_p = IPPROTO_IDP;
ip->ip_src = ifn->ifen_src;
ip->ip_dst = ifn->ifen_dst;
ip->ip_len = (u_short)len + sizeof(struct ip);
ip->ip_ttl = MAXTTL;
/*
* Output final datagram.
*/
error = (ip_output(m, (struct mbuf *)NULL, ro, SO_BROADCAST, NULL));
if (error) {
ifn->ifen_ifnet.if_oerrors++;
ifn->ifen_ifnet.if_ierrors = error;
}
return (error);
m_freem(m);
return (ENETUNREACH);
}
static void
ipxipstart(ifp)
struct ifnet *ifp;
{
panic("ipxip_start called\n");
}
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static struct ifreq ifr_ipxip = {"ipxip0"};
int
ipxip_route(so, sopt)
struct socket *so;
struct sockopt *sopt;
{
int error;
struct ifnet_en *ifn;
struct sockaddr_in *src;
struct ipxip_req rq;
struct sockaddr_ipx *ipx_dst;
struct sockaddr_in *ip_dst;
struct route ro;
error = sooptcopyin(sopt, &rq, sizeof rq, sizeof rq);
if (error)
return (error);
ipx_dst = (struct sockaddr_ipx *)&rq.rq_ipx;
ip_dst = (struct sockaddr_in *)&rq.rq_ip;
/*
* First, make sure we already have an IPX address:
*/
if (ipx_ifaddr == NULL)
return (EADDRNOTAVAIL);
/*
* Now, determine if we can get to the destination
*/
bzero((caddr_t)&ro, sizeof(ro));
ro.ro_dst = *(struct sockaddr *)ip_dst;
rtalloc(&ro);
if (ro.ro_rt == NULL || ro.ro_rt->rt_ifp == NULL) {
return (ENETUNREACH);
}
/*
* And see how he's going to get back to us:
* i.e., what return ip address do we use?
*/
{
register struct in_ifaddr *ia;
struct ifnet *ifp = ro.ro_rt->rt_ifp;
for (ia = TAILQ_FIRST(&in_ifaddrhead); ia != NULL;
ia = TAILQ_NEXT(ia, ia_link))
if (ia->ia_ifp == ifp)
break;
if (ia == NULL)
ia = TAILQ_FIRST(&in_ifaddrhead);
if (ia == NULL) {
RTFREE(ro.ro_rt);
return (EADDRNOTAVAIL);
}
src = (struct sockaddr_in *)&ia->ia_addr;
}
/*
* Is there a free (pseudo-)interface or space?
*/
for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
break;
}
if (ifn == NULL)
ifn = ipxipattach();
if (ifn == NULL) {
RTFREE(ro.ro_rt);
return (ENOBUFS);
}
ifn->ifen_route = ro;
ifn->ifen_dst = ip_dst->sin_addr;
ifn->ifen_src = src->sin_addr;
/*
* now configure this as a point to point link
*/
ifr_ipxip.ifr_name[4] = '0' + ipxipif.if_unit - 1;
ifr_ipxip.ifr_dstaddr = *(struct sockaddr *)ipx_dst;
ipx_control(so, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
(struct ifnet *)ifn, sopt->sopt_td);
/* use any of our addresses */
satoipx_addr(ifr_ipxip.ifr_addr).x_host =
ipx_ifaddr->ia_addr.sipx_addr.x_host;
return (ipx_control(so, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
(struct ifnet *)ifn, sopt->sopt_td));
}
static int
ipxip_free(ifp)
struct ifnet *ifp;
{
register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
struct route *ro = & ifn->ifen_route;
if (ro->ro_rt != NULL) {
RTFREE(ro->ro_rt);
ro->ro_rt = NULL;
}
ifp->if_flags &= ~IFF_UP;
return (0);
}
void
ipxip_ctlinput(cmd, sa, dummy)
int cmd;
struct sockaddr *sa;
void *dummy;
{
struct sockaddr_in *sin;
if ((unsigned)cmd >= PRC_NCMDS)
return;
if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
return;
sin = (struct sockaddr_in *)sa;
if (sin->sin_addr.s_addr == INADDR_ANY)
return;
switch (cmd) {
case PRC_ROUTEDEAD:
case PRC_REDIRECT_NET:
case PRC_REDIRECT_HOST:
case PRC_REDIRECT_TOSNET:
case PRC_REDIRECT_TOSHOST:
ipxip_rtchange(&sin->sin_addr);
break;
}
}
static void
ipxip_rtchange(dst)
register struct in_addr *dst;
{
register struct ifnet_en *ifn;
for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
if (ifn->ifen_dst.s_addr == dst->s_addr &&
ifn->ifen_route.ro_rt != NULL) {
RTFREE(ifn->ifen_route.ro_rt);
ifn->ifen_route.ro_rt = NULL;
}
}
}
#endif /* IPXIP */