512 lines
12 KiB
C
512 lines
12 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_input.c
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/random.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/route.h>
|
|
#include <net/netisr.h>
|
|
#include <net/intrq.h>
|
|
|
|
#include <netipx/ipx.h>
|
|
#include <netipx/spx.h>
|
|
#include <netipx/ipx_if.h>
|
|
#include <netipx/ipx_pcb.h>
|
|
#include <netipx/ipx_var.h>
|
|
|
|
int ipxcksum = 0;
|
|
SYSCTL_INT(_net_ipx_ipx, OID_AUTO, checksum, CTLFLAG_RW,
|
|
&ipxcksum, 0, "");
|
|
|
|
static int ipxprintfs = 0; /* printing forwarding information */
|
|
SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxprintfs, CTLFLAG_RW,
|
|
&ipxprintfs, 0, "");
|
|
|
|
static int ipxforwarding = 0;
|
|
SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxforwarding, CTLFLAG_RW,
|
|
&ipxforwarding, 0, "");
|
|
|
|
static int ipxnetbios = 0;
|
|
SYSCTL_INT(_net_ipx, OID_AUTO, ipxnetbios, CTLFLAG_RW,
|
|
&ipxnetbios, 0, "");
|
|
|
|
union ipx_net ipx_zeronet;
|
|
union ipx_host ipx_zerohost;
|
|
|
|
union ipx_net ipx_broadnet;
|
|
union ipx_host ipx_broadhost;
|
|
|
|
struct ipxstat ipxstat;
|
|
struct sockaddr_ipx ipx_netmask, ipx_hostmask;
|
|
|
|
static u_short allones[] = {-1, -1, -1};
|
|
|
|
struct ipxpcb ipxpcb;
|
|
struct ipxpcb ipxrawpcb;
|
|
|
|
static int ipxqmaxlen = IFQ_MAXLEN;
|
|
|
|
long ipx_pexseq;
|
|
const int ipxintrq_present = 1;
|
|
|
|
static int ipx_do_route(struct ipx_addr *src, struct route *ro);
|
|
static void ipx_undo_route(struct route *ro);
|
|
static void ipx_forward(struct mbuf *m);
|
|
|
|
/*
|
|
* IPX initialization.
|
|
*/
|
|
|
|
void
|
|
ipx_init()
|
|
{
|
|
ipx_broadnet = *(union ipx_net *)allones;
|
|
ipx_broadhost = *(union ipx_host *)allones;
|
|
|
|
read_random(&ipx_pexseq, sizeof ipx_pexseq);
|
|
ipxintrq.ifq_maxlen = ipxqmaxlen;
|
|
mtx_init(&ipxintrq.ifq_mtx, "ipx_inq", MTX_DEF);
|
|
ipxpcb.ipxp_next = ipxpcb.ipxp_prev = &ipxpcb;
|
|
ipxrawpcb.ipxp_next = ipxrawpcb.ipxp_prev = &ipxrawpcb;
|
|
|
|
ipx_netmask.sipx_len = 6;
|
|
ipx_netmask.sipx_addr.x_net = ipx_broadnet;
|
|
|
|
ipx_hostmask.sipx_len = 12;
|
|
ipx_hostmask.sipx_addr.x_net = ipx_broadnet;
|
|
ipx_hostmask.sipx_addr.x_host = ipx_broadhost;
|
|
|
|
register_netisr(NETISR_IPX, ipxintr);
|
|
}
|
|
|
|
/*
|
|
* IPX input routine. Pass to next level.
|
|
*/
|
|
void
|
|
ipxintr()
|
|
{
|
|
register struct ipx *ipx;
|
|
register struct mbuf *m;
|
|
register struct ipxpcb *ipxp;
|
|
struct ipx_ifaddr *ia;
|
|
int len, s;
|
|
|
|
next:
|
|
/*
|
|
* Get next datagram off input queue and get IPX header
|
|
* in first mbuf.
|
|
*/
|
|
s = splimp();
|
|
IF_DEQUEUE(&ipxintrq, m);
|
|
splx(s);
|
|
if (m == NULL)
|
|
return;
|
|
/*
|
|
* If no IPX addresses have been set yet but the interfaces
|
|
* are receiving, can't do anything with incoming packets yet.
|
|
*/
|
|
if (ipx_ifaddr == NULL)
|
|
goto bad;
|
|
|
|
ipxstat.ipxs_total++;
|
|
|
|
if ((m->m_flags & M_EXT || m->m_len < sizeof(struct ipx)) &&
|
|
(m = m_pullup(m, sizeof(struct ipx))) == 0) {
|
|
ipxstat.ipxs_toosmall++;
|
|
goto next;
|
|
}
|
|
|
|
/*
|
|
* Give any raw listeners a crack at the packet
|
|
*/
|
|
for (ipxp = ipxrawpcb.ipxp_next; ipxp != &ipxrawpcb;
|
|
ipxp = ipxp->ipxp_next) {
|
|
struct mbuf *m1 = m_copy(m, 0, (int)M_COPYALL);
|
|
if (m1 != NULL)
|
|
ipx_input(m1, ipxp);
|
|
}
|
|
|
|
ipx = mtod(m, struct ipx *);
|
|
len = ntohs(ipx->ipx_len);
|
|
/*
|
|
* Check that the amount of data in the buffers
|
|
* is as at least much as the IPX header would have us expect.
|
|
* Trim mbufs if longer than we expect.
|
|
* Drop packet if shorter than we expect.
|
|
*/
|
|
if (m->m_pkthdr.len < len) {
|
|
ipxstat.ipxs_tooshort++;
|
|
goto bad;
|
|
}
|
|
if (m->m_pkthdr.len > len) {
|
|
if (m->m_len == m->m_pkthdr.len) {
|
|
m->m_len = len;
|
|
m->m_pkthdr.len = len;
|
|
} else
|
|
m_adj(m, len - m->m_pkthdr.len);
|
|
}
|
|
if (ipxcksum && ipx->ipx_sum != 0xffff) {
|
|
if (ipx->ipx_sum != ipx_cksum(m, len)) {
|
|
ipxstat.ipxs_badsum++;
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Propagated (Netbios) packets (type 20) has to be handled
|
|
* different. :-(
|
|
*/
|
|
if (ipx->ipx_pt == IPXPROTO_NETBIOS) {
|
|
if (ipxnetbios) {
|
|
ipx_output_type20(m);
|
|
goto next;
|
|
} else
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Is this a directed broadcast?
|
|
*/
|
|
if (ipx_hosteqnh(ipx_broadhost,ipx->ipx_dna.x_host)) {
|
|
if ((!ipx_neteq(ipx->ipx_dna, ipx->ipx_sna)) &&
|
|
(!ipx_neteqnn(ipx->ipx_dna.x_net, ipx_broadnet)) &&
|
|
(!ipx_neteqnn(ipx->ipx_sna.x_net, ipx_zeronet)) &&
|
|
(!ipx_neteqnn(ipx->ipx_dna.x_net, ipx_zeronet)) ) {
|
|
/*
|
|
* If it is a broadcast to the net where it was
|
|
* received from, treat it as ours.
|
|
*/
|
|
for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
|
|
if((ia->ia_ifa.ifa_ifp == m->m_pkthdr.rcvif) &&
|
|
ipx_neteq(ia->ia_addr.sipx_addr,
|
|
ipx->ipx_dna))
|
|
goto ours;
|
|
|
|
/*
|
|
* Look to see if I need to eat this packet.
|
|
* Algorithm is to forward all young packets
|
|
* and prematurely age any packets which will
|
|
* by physically broadcasted.
|
|
* Any very old packets eaten without forwarding
|
|
* would die anyway.
|
|
*
|
|
* Suggestion of Bill Nesheim, Cornell U.
|
|
*/
|
|
if (ipx->ipx_tc < IPX_MAXHOPS) {
|
|
ipx_forward(m);
|
|
goto next;
|
|
}
|
|
}
|
|
/*
|
|
* Is this our packet? If not, forward.
|
|
*/
|
|
} else {
|
|
for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
|
|
if (ipx_hosteq(ipx->ipx_dna, ia->ia_addr.sipx_addr) &&
|
|
(ipx_neteq(ipx->ipx_dna, ia->ia_addr.sipx_addr) ||
|
|
ipx_neteqnn(ipx->ipx_dna.x_net, ipx_zeronet)))
|
|
break;
|
|
|
|
if (ia == NULL) {
|
|
ipx_forward(m);
|
|
goto next;
|
|
}
|
|
}
|
|
ours:
|
|
/*
|
|
* Locate pcb for datagram.
|
|
*/
|
|
ipxp = ipx_pcblookup(&ipx->ipx_sna, ipx->ipx_dna.x_port, IPX_WILDCARD);
|
|
/*
|
|
* Switch out to protocol's input routine.
|
|
*/
|
|
if (ipxp != NULL) {
|
|
ipxstat.ipxs_delivered++;
|
|
if ((ipxp->ipxp_flags & IPXP_ALL_PACKETS) == 0)
|
|
switch (ipx->ipx_pt) {
|
|
|
|
case IPXPROTO_SPX:
|
|
spx_input(m, ipxp);
|
|
goto next;
|
|
}
|
|
ipx_input(m, ipxp);
|
|
} else
|
|
goto bad;
|
|
|
|
goto next;
|
|
|
|
bad:
|
|
m_freem(m);
|
|
goto next;
|
|
}
|
|
|
|
void
|
|
ipx_ctlinput(cmd, arg_as_sa, dummy)
|
|
int cmd;
|
|
struct sockaddr *arg_as_sa; /* XXX should be swapped with dummy */
|
|
void *dummy;
|
|
{
|
|
caddr_t arg = (/* XXX */ caddr_t)arg_as_sa;
|
|
struct ipx_addr *ipx;
|
|
|
|
if (cmd < 0 || cmd > PRC_NCMDS)
|
|
return;
|
|
switch (cmd) {
|
|
struct sockaddr_ipx *sipx;
|
|
|
|
case PRC_IFDOWN:
|
|
case PRC_HOSTDEAD:
|
|
case PRC_HOSTUNREACH:
|
|
sipx = (struct sockaddr_ipx *)arg;
|
|
if (sipx->sipx_family != AF_IPX)
|
|
return;
|
|
ipx = &sipx->sipx_addr;
|
|
break;
|
|
|
|
default:
|
|
if (ipxprintfs)
|
|
printf("ipx_ctlinput: cmd %d.\n", cmd);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Forward a packet. If some error occurs drop the packet. IPX don't
|
|
* have a way to return errors to the sender.
|
|
*/
|
|
|
|
static struct route ipx_droute;
|
|
static struct route ipx_sroute;
|
|
|
|
static void
|
|
ipx_forward(m)
|
|
struct mbuf *m;
|
|
{
|
|
register struct ipx *ipx = mtod(m, struct ipx *);
|
|
register int error;
|
|
struct mbuf *mcopy = NULL;
|
|
int agedelta = 1;
|
|
int flags = IPX_FORWARDING;
|
|
int ok_there = 0;
|
|
int ok_back = 0;
|
|
|
|
if (ipxforwarding == 0) {
|
|
/* can't tell difference between net and host */
|
|
ipxstat.ipxs_cantforward++;
|
|
m_freem(m);
|
|
goto cleanup;
|
|
}
|
|
ipx->ipx_tc++;
|
|
if (ipx->ipx_tc > IPX_MAXHOPS) {
|
|
ipxstat.ipxs_cantforward++;
|
|
m_freem(m);
|
|
goto cleanup;
|
|
}
|
|
|
|
if ((ok_there = ipx_do_route(&ipx->ipx_dna,&ipx_droute)) == 0) {
|
|
ipxstat.ipxs_noroute++;
|
|
m_freem(m);
|
|
goto cleanup;
|
|
}
|
|
/*
|
|
* Here we think about forwarding broadcast packets,
|
|
* so we try to insure that it doesn't go back out
|
|
* on the interface it came in on. Also, if we
|
|
* are going to physically broadcast this, let us
|
|
* age the packet so we can eat it safely the second time around.
|
|
*/
|
|
if (ipx->ipx_dna.x_host.c_host[0] & 0x1) {
|
|
struct ipx_ifaddr *ia = ipx_iaonnetof(&ipx->ipx_dna);
|
|
struct ifnet *ifp;
|
|
if (ia != NULL) {
|
|
/* I'm gonna hafta eat this packet */
|
|
agedelta += IPX_MAXHOPS - ipx->ipx_tc;
|
|
ipx->ipx_tc = IPX_MAXHOPS;
|
|
}
|
|
if ((ok_back = ipx_do_route(&ipx->ipx_sna,&ipx_sroute)) == 0) {
|
|
/* error = ENETUNREACH; He'll never get it! */
|
|
ipxstat.ipxs_noroute++;
|
|
m_freem(m);
|
|
goto cleanup;
|
|
}
|
|
if (ipx_droute.ro_rt &&
|
|
(ifp = ipx_droute.ro_rt->rt_ifp) &&
|
|
ipx_sroute.ro_rt &&
|
|
(ifp != ipx_sroute.ro_rt->rt_ifp)) {
|
|
flags |= IPX_ALLOWBROADCAST;
|
|
} else {
|
|
ipxstat.ipxs_noroute++;
|
|
m_freem(m);
|
|
goto cleanup;
|
|
}
|
|
}
|
|
/*
|
|
* We don't need to recompute checksum because ipx_tc field
|
|
* is ignored by checksum calculation routine, however
|
|
* it may be desirable to reset checksum if ipxcksum == 0
|
|
*/
|
|
#if 0
|
|
if (!ipxcksum)
|
|
ipx->ipx_sum = 0xffff;
|
|
#endif
|
|
|
|
error = ipx_outputfl(m, &ipx_droute, flags);
|
|
if (error == 0) {
|
|
ipxstat.ipxs_forward++;
|
|
|
|
if (ipxprintfs) {
|
|
printf("forward: ");
|
|
ipx_printhost(&ipx->ipx_sna);
|
|
printf(" to ");
|
|
ipx_printhost(&ipx->ipx_dna);
|
|
printf(" hops %d\n", ipx->ipx_tc);
|
|
}
|
|
} else if (mcopy != NULL) {
|
|
ipx = mtod(mcopy, struct ipx *);
|
|
switch (error) {
|
|
|
|
case ENETUNREACH:
|
|
case EHOSTDOWN:
|
|
case EHOSTUNREACH:
|
|
case ENETDOWN:
|
|
case EPERM:
|
|
ipxstat.ipxs_noroute++;
|
|
break;
|
|
|
|
case EMSGSIZE:
|
|
ipxstat.ipxs_mtutoosmall++;
|
|
break;
|
|
|
|
case ENOBUFS:
|
|
ipxstat.ipxs_odropped++;
|
|
break;
|
|
}
|
|
mcopy = NULL;
|
|
m_freem(m);
|
|
}
|
|
cleanup:
|
|
if (ok_there)
|
|
ipx_undo_route(&ipx_droute);
|
|
if (ok_back)
|
|
ipx_undo_route(&ipx_sroute);
|
|
if (mcopy != NULL)
|
|
m_freem(mcopy);
|
|
}
|
|
|
|
static int
|
|
ipx_do_route(src, ro)
|
|
struct ipx_addr *src;
|
|
struct route *ro;
|
|
{
|
|
struct sockaddr_ipx *dst;
|
|
|
|
bzero((caddr_t)ro, sizeof(*ro));
|
|
dst = (struct sockaddr_ipx *)&ro->ro_dst;
|
|
|
|
dst->sipx_len = sizeof(*dst);
|
|
dst->sipx_family = AF_IPX;
|
|
dst->sipx_addr = *src;
|
|
dst->sipx_addr.x_port = 0;
|
|
rtalloc(ro);
|
|
if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL) {
|
|
return (0);
|
|
}
|
|
ro->ro_rt->rt_use++;
|
|
return (1);
|
|
}
|
|
|
|
static void
|
|
ipx_undo_route(ro)
|
|
register struct route *ro;
|
|
{
|
|
if (ro->ro_rt != NULL) {
|
|
RTFREE(ro->ro_rt);
|
|
}
|
|
}
|
|
|
|
void
|
|
ipx_watch_output(m, ifp)
|
|
struct mbuf *m;
|
|
struct ifnet *ifp;
|
|
{
|
|
register struct ipxpcb *ipxp;
|
|
register struct ifaddr *ifa;
|
|
register struct ipx_ifaddr *ia;
|
|
/*
|
|
* Give any raw listeners a crack at the packet
|
|
*/
|
|
for (ipxp = ipxrawpcb.ipxp_next; ipxp != &ipxrawpcb;
|
|
ipxp = ipxp->ipxp_next) {
|
|
struct mbuf *m0 = m_copy(m, 0, (int)M_COPYALL);
|
|
if (m0 != NULL) {
|
|
register struct ipx *ipx;
|
|
|
|
M_PREPEND(m0, sizeof(*ipx), M_DONTWAIT);
|
|
if (m0 == NULL)
|
|
continue;
|
|
ipx = mtod(m0, struct ipx *);
|
|
ipx->ipx_sna.x_net = ipx_zeronet;
|
|
for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
|
|
if (ifp == ia->ia_ifp)
|
|
break;
|
|
if (ia == NULL)
|
|
ipx->ipx_sna.x_host = ipx_zerohost;
|
|
else
|
|
ipx->ipx_sna.x_host =
|
|
ia->ia_addr.sipx_addr.x_host;
|
|
|
|
if (ifp != NULL && (ifp->if_flags & IFF_POINTOPOINT))
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
if (ifa->ifa_addr->sa_family == AF_IPX) {
|
|
ipx->ipx_sna = IA_SIPX(ifa)->sipx_addr;
|
|
break;
|
|
}
|
|
}
|
|
ipx->ipx_len = ntohl(m0->m_pkthdr.len);
|
|
ipx_input(m0, ipxp);
|
|
}
|
|
}
|
|
}
|