437 lines
10 KiB
C
437 lines
10 KiB
C
/*
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* Copyright (c) 1995, Mike Mitchell
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* Copyright (c) 1984, 1985, 1986, 1987, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ipx_ip.c
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*/
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/*
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* Software interface driver for encapsulating IPX in IP.
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*/
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#ifdef IPXIP
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <sys/protosw.h>
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#include <net/if.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <machine/mtpr.h>
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#include <netipx/ipx.h>
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#include <netipx/ipx_if.h>
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#include <netipx/ipx_ip.h>
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struct ifnet ipxipif;
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struct ifnet_en *ipxip_list; /* list of all hosts and gateways or broadcast addrs */
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struct ifnet_en *
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ipxipattach()
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{
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register struct ifnet_en *m;
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register struct ifnet *ifp;
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if (ipxipif.if_mtu == 0) {
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ifp = &ipxipif;
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ifp->if_name = "ipxip";
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ifp->if_mtu = LOMTU;
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ifp->if_ioctl = ipxipioctl;
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ifp->if_output = ipxipoutput;
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ifp->if_start = ipxipstart;
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ifp->if_flags = IFF_POINTOPOINT;
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}
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MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT);
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if (m == NULL) return (NULL);
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m->ifen_next = ipxip_list;
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ipxip_list = m;
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ifp = &m->ifen_ifnet;
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ifp->if_name = "ipxip";
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ifp->if_mtu = LOMTU;
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ifp->if_ioctl = ipxipioctl;
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ifp->if_output = ipxipoutput;
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ifp->if_start = ipxipstart;
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ifp->if_flags = IFF_POINTOPOINT;
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ifp->if_unit = ipxipif.if_unit++;
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if_attach(ifp);
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return (m);
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}
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/*
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* Process an ioctl request.
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*/
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/* ARGSUSED */
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int
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ipxipioctl(ifp, cmd, data)
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register struct ifnet *ifp;
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int cmd;
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caddr_t data;
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{
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int error = 0;
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struct ifreq *ifr;
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switch (cmd) {
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case SIOCSIFADDR:
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ifp->if_flags |= IFF_UP;
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/* fall into: */
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case SIOCSIFDSTADDR:
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/*
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* Everything else is done at a higher level.
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*/
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break;
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case SIOCSIFFLAGS:
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ifr = (struct ifreq *)data;
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if ((ifr->ifr_flags & IFF_UP) == 0)
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error = ipxip_free(ifp);
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default:
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error = EINVAL;
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}
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return (error);
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}
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struct mbuf *ipxip_badlen;
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struct mbuf *ipxip_lastin;
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int ipxip_hold_input;
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void
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ipxip_input(m, ifp)
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register struct mbuf *m;
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struct ifnet *ifp;
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{
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register struct ip *ip;
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register struct ipx *ipx;
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register struct ifqueue *ifq = &ipxintrq;
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int len, s;
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if (ipxip_hold_input) {
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if (ipxip_lastin) {
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m_freem(ipxip_lastin);
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}
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ipxip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
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}
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/*
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* Get IP and IPX header together in first mbuf.
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*/
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ipxipif.if_ipackets++;
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s = sizeof (struct ip) + sizeof (struct ipx);
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if (((m->m_flags & M_EXT) || m->m_len < s) &&
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(m = m_pullup(m, s)) == 0) {
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ipxipif.if_ierrors++;
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return;
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}
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ip = mtod(m, struct ip *);
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if (ip->ip_hl > (sizeof (struct ip) >> 2)) {
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ip_stripoptions(m, (struct mbuf *)0);
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if (m->m_len < s) {
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if ((m = m_pullup(m, s)) == 0) {
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ipxipif.if_ierrors++;
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return;
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}
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ip = mtod(m, struct ip *);
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}
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}
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/*
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* Make mbuf data length reflect IPX length.
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* If not enough data to reflect IPX length, drop.
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*/
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m->m_data += sizeof (struct ip);
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m->m_len -= sizeof (struct ip);
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m->m_pkthdr.len -= sizeof (struct ip);
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ipx = mtod(m, struct ipx *);
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len = ntohs(ipx->ipx_len);
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if (len & 1) len++; /* Preserve Garbage Byte */
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if (ip->ip_len != len) {
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if (len > ip->ip_len) {
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ipxipif.if_ierrors++;
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if (ipxip_badlen) m_freem(ipxip_badlen);
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ipxip_badlen = m;
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return;
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}
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/* Any extra will be trimmed off by the IPX routines */
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}
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/*
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* Place interface pointer before the data
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* for the receiving protocol.
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*/
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m->m_pkthdr.rcvif = ifp;
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/*
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* Deliver to IPX
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*/
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s = splimp();
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if (IF_QFULL(ifq)) {
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IF_DROP(ifq);
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bad:
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m_freem(m);
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splx(s);
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return;
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}
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IF_ENQUEUE(ifq, m);
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schednetisr(NETISR_IPX);
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splx(s);
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return;
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}
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/* ARGSUSED */
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int
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ipxipoutput(ifn, m, dst)
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struct ifnet_en *ifn;
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register struct mbuf *m;
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struct sockaddr *dst;
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{
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register struct ip *ip;
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register struct route *ro = &(ifn->ifen_route);
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register int len = 0;
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register struct ipx *ipx = mtod(m, struct ipx *);
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int error;
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ifn->ifen_ifnet.if_opackets++;
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ipxipif.if_opackets++;
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/*
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* Calculate data length and make space
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* for IP header.
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*/
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len = ntohs(ipx->ipx_len);
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if (len & 1) len++; /* Preserve Garbage Byte */
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/* following clause not necessary on vax */
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if (3 & (int)m->m_data) {
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/* force longword alignment of ip hdr */
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struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
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if (m0 == 0) {
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m_freem(m);
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return (ENOBUFS);
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}
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MH_ALIGN(m0, sizeof (struct ip));
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m0->m_flags = m->m_flags & M_COPYFLAGS;
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m0->m_next = m;
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m0->m_len = sizeof (struct ip);
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m0->m_pkthdr.len = m0->m_len + m->m_len;
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m->m_flags &= ~M_PKTHDR;
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} else {
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M_PREPEND(m, sizeof (struct ip), M_DONTWAIT);
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if (m == 0)
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return (ENOBUFS);
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}
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/*
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* Fill in IP header.
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*/
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ip = mtod(m, struct ip *);
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*(long *)ip = 0;
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ip->ip_p = IPPROTO_IDP;
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ip->ip_src = ifn->ifen_src;
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ip->ip_dst = ifn->ifen_dst;
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ip->ip_len = (u_short)len + sizeof (struct ip);
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ip->ip_ttl = MAXTTL;
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/*
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* Output final datagram.
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*/
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error = (ip_output(m, (struct mbuf *)0, ro, SO_BROADCAST, NULL));
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if (error) {
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ifn->ifen_ifnet.if_oerrors++;
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ifn->ifen_ifnet.if_ierrors = error;
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}
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return (error);
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bad:
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m_freem(m);
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return (ENETUNREACH);
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}
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void
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ipxipstart(ifp)
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struct ifnet *ifp;
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{
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panic("ipxip_start called\n");
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}
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struct ifreq ifr_ipxip = {"ipxip0"};
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int
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ipxip_route(m)
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register struct mbuf *m;
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{
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register struct ipxip_req *rq = mtod(m, struct ipxip_req *);
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struct sockaddr_ipx *ipx_dst = (struct sockaddr_ipx *)&rq->rq_ipx;
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struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip;
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struct route ro;
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struct ifnet_en *ifn;
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struct sockaddr_in *src;
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/*
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* First, make sure we already have an IPX address:
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*/
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if (ipx_hosteqnh(ipx_thishost, ipx_zerohost))
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return (EADDRNOTAVAIL);
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/*
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* Now, determine if we can get to the destination
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*/
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bzero((caddr_t)&ro, sizeof (ro));
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ro.ro_dst = *(struct sockaddr *)ip_dst;
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rtalloc(&ro);
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if (ro.ro_rt == 0 || ro.ro_rt->rt_ifp == 0) {
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return (ENETUNREACH);
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}
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/*
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* And see how he's going to get back to us:
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* i.e., what return ip address do we use?
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*/
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{
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register struct in_ifaddr *ia;
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struct ifnet *ifp = ro.ro_rt->rt_ifp;
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for (ia = in_ifaddr; ia; ia = ia->ia_next)
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if (ia->ia_ifp == ifp)
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break;
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if (ia == 0)
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ia = in_ifaddr;
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if (ia == 0) {
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RTFREE(ro.ro_rt);
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return (EADDRNOTAVAIL);
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}
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src = (struct sockaddr_in *)&ia->ia_addr;
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}
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/*
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* Is there a free (pseudo-)interface or space?
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*/
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for (ifn = ipxip_list; ifn; ifn = ifn->ifen_next) {
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if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
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break;
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}
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if (ifn == NULL)
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ifn = ipxipattach();
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if (ifn == NULL) {
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RTFREE(ro.ro_rt);
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return (ENOBUFS);
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}
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ifn->ifen_route = ro;
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ifn->ifen_dst = ip_dst->sin_addr;
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ifn->ifen_src = src->sin_addr;
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/*
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* now configure this as a point to point link
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*/
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ifr_ipxip.ifr_name[4] = '0' + ipxipif.if_unit - 1;
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ifr_ipxip.ifr_dstaddr = * (struct sockaddr *) ipx_dst;
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(void)ipx_control((struct socket *)0, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
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(struct ifnet *)ifn);
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satoipx_addr(ifr_ipxip.ifr_addr).x_host = ipx_thishost;
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return (ipx_control((struct socket *)0, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
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(struct ifnet *)ifn));
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}
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int
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ipxip_free(ifp)
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struct ifnet *ifp;
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{
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register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
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struct route *ro = & ifn->ifen_route;
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if (ro->ro_rt) {
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RTFREE(ro->ro_rt);
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ro->ro_rt = 0;
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}
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ifp->if_flags &= ~IFF_UP;
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return (0);
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}
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void
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ipxip_ctlinput(cmd, sa)
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int cmd;
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struct sockaddr *sa;
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{
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/*extern u_char inetctlerrmap[]; */ /*XXX*/ /*JRE*/
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struct sockaddr_in *sin;
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/* int in_rtchange(); */ /*XXX*/ /*JRE*/
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if ((unsigned)cmd >= PRC_NCMDS)
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return;
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if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
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return;
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sin = (struct sockaddr_in *)sa;
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if (sin->sin_addr.s_addr == INADDR_ANY)
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return;
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switch (cmd) {
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case PRC_ROUTEDEAD:
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case PRC_REDIRECT_NET:
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case PRC_REDIRECT_HOST:
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case PRC_REDIRECT_TOSNET:
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case PRC_REDIRECT_TOSHOST:
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ipxip_rtchange(&sin->sin_addr);
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break;
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}
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}
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void
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ipxip_rtchange(dst)
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register struct in_addr *dst;
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{
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register struct ifnet_en *ifn;
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for (ifn = ipxip_list; ifn; ifn = ifn->ifen_next) {
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if (ifn->ifen_dst.s_addr == dst->s_addr &&
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ifn->ifen_route.ro_rt) {
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RTFREE(ifn->ifen_route.ro_rt);
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ifn->ifen_route.ro_rt = 0;
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}
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}
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}
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#endif
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