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freebsd/sys/netipx/ipx_ip.c
Garrett Wollman cfe8b629f1 Yow! Completely change the way socket options are handled, eliminating
another specialized mbuf type in the process.  Also clean up some
of the cruft surrounding IPFW, multicast routing, RSVP, and other
ill-explored corners.
1998-08-23 03:07:17 +00:00

464 lines
11 KiB
C

/*
* 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
*
* $Id: ipx_ip.c,v 1.21 1998/06/07 17:12:19 dfr Exp $
*/
/*
* 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>
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);
if (m == NULL)
return (NULL);
bzero(m, sizeof(*m));
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);
}
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
*/
s = splimp();
if (IF_QFULL(ifq)) {
IF_DROP(ifq);
m_freem(m);
splx(s);
return;
}
IF_ENQUEUE(ifq, m);
schednetisr(NETISR_IPX);
splx(s);
return;
}
static int
ipxipoutput(ifp, m, dst, rt)
struct ifnet *ifp;
register 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");
}
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 = in_ifaddrhead.tqh_first; ia != NULL;
ia = ia->ia_link.tqe_next)
if (ia->ia_ifp == ifp)
break;
if (ia == NULL)
ia = in_ifaddrhead.tqh_first;
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_p);
/* 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_p));
}
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 */