543 lines
13 KiB
C
543 lines
13 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_input.c
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*
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* $Id: ipx_input.c,v 1.16 1998/03/30 09:53:09 phk Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/netisr.h>
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#include <netipx/ipx.h>
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#include <netipx/spx.h>
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#include <netipx/ipx_if.h>
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#include <netipx/ipx_pcb.h>
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#include <netipx/ipx_var.h>
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#include <machine/random.h>
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int ipxcksum = 0;
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SYSCTL_INT(_net_ipx_ipx, OID_AUTO, checksum, CTLFLAG_RW,
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&ipxcksum, 0, "");
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static int ipxprintfs = 0; /* printing forwarding information */
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SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxprintfs, CTLFLAG_RW,
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&ipxprintfs, 0, "");
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static int ipxforwarding = 0;
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SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxforwarding, CTLFLAG_RW,
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&ipxforwarding, 0, "");
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static int ipxnetbios = 0;
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SYSCTL_INT(_net_ipx, OID_AUTO, ipxnetbios, CTLFLAG_RW,
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&ipxnetbios, 0, "");
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union ipx_net ipx_zeronet;
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union ipx_host ipx_zerohost;
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union ipx_net ipx_broadnet;
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union ipx_host ipx_broadhost;
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struct ipxstat ipxstat;
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struct sockaddr_ipx ipx_netmask, ipx_hostmask;
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static u_short allones[] = {-1, -1, -1};
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struct ipxpcb ipxpcb;
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struct ipxpcb ipxrawpcb;
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struct ifqueue ipxintrq;
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static int ipxqmaxlen = IFQ_MAXLEN;
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long ipx_pexseq;
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NETISR_SET(NETISR_IPX, ipxintr);
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static int ipx_do_route(struct ipx_addr *src, struct route *ro);
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static void ipx_undo_route(struct route *ro);
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static void ipx_forward(struct mbuf *m);
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/*
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* IPX initialization.
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*/
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void
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ipx_init()
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{
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ipx_broadnet = *(union ipx_net *)allones;
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ipx_broadhost = *(union ipx_host *)allones;
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read_random(&ipx_pexseq, sizeof ipx_pexseq);
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ipxintrq.ifq_maxlen = ipxqmaxlen;
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ipxpcb.ipxp_next = ipxpcb.ipxp_prev = &ipxpcb;
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ipxrawpcb.ipxp_next = ipxrawpcb.ipxp_prev = &ipxrawpcb;
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ipx_netmask.sipx_len = 6;
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ipx_netmask.sipx_addr.x_net = ipx_broadnet;
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ipx_hostmask.sipx_len = 12;
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ipx_hostmask.sipx_addr.x_net = ipx_broadnet;
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ipx_hostmask.sipx_addr.x_host = ipx_broadhost;
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}
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/*
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* IPX input routine. Pass to next level.
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*/
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void
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ipxintr()
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{
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register struct ipx *ipx;
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register struct mbuf *m;
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register struct ipxpcb *ipxp;
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struct ipx_ifaddr *ia;
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register int i;
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int len, s;
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char oddshortpacket = 0;
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next:
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/*
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* Get next datagram off input queue and get IPX header
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* in first mbuf.
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*/
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s = splimp();
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IF_DEQUEUE(&ipxintrq, m);
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splx(s);
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if (m == NULL)
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return;
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/*
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* If no IPX addresses have been set yet but the interfaces
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* are receiving, can't do anything with incoming packets yet.
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*/
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if (ipx_ifaddr == NULL)
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goto bad;
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ipxstat.ipxs_total++;
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if ((m->m_flags & M_EXT || m->m_len < sizeof(struct ipx)) &&
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(m = m_pullup(m, sizeof(struct ipx))) == 0) {
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ipxstat.ipxs_toosmall++;
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goto next;
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}
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/*
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* Give any raw listeners a crack at the packet
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*/
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for (ipxp = ipxrawpcb.ipxp_next; ipxp != &ipxrawpcb;
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ipxp = ipxp->ipxp_next) {
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struct mbuf *m1 = m_copy(m, 0, (int)M_COPYALL);
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if (m1 != NULL)
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ipx_input(m1, ipxp);
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}
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ipx = mtod(m, struct ipx *);
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len = ntohs(ipx->ipx_len);
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if ((len < m->m_pkthdr.len) && (oddshortpacket = len & 1)) {
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/*
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* If this packet is of odd length, and the length
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* inside the header is less than the received packet
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* length, preserve garbage byte for possible checksum.
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*/
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len++;
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}
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/*
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* Check that the amount of data in the buffers
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* is as at least much as the IPX header would have us expect.
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* Trim mbufs if longer than we expect.
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* Drop packet if shorter than we expect.
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*/
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if (m->m_pkthdr.len < len) {
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ipxstat.ipxs_tooshort++;
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goto bad;
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}
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if (m->m_pkthdr.len > len) {
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if (m->m_len == m->m_pkthdr.len) {
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m->m_len = len;
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m->m_pkthdr.len = len;
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} else
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m_adj(m, len - m->m_pkthdr.len);
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}
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if (ipxcksum && ((i = ipx->ipx_sum) != 0xffff)) {
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ipx->ipx_sum = 0;
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if (i != (ipx->ipx_sum = ipx_cksum(m, len))) {
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ipxstat.ipxs_badsum++;
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goto bad;
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}
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}
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/*
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* Propagated (Netbios) packets (type 20) has to be handled
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* different. :-(
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*/
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if (ipx->ipx_pt == IPXPROTO_NETBIOS) {
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if (ipxnetbios) {
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ipx_output_type20(m);
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goto next;
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} else
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goto bad;
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}
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/*
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* Is this a directed broadcast?
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*/
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if (ipx_hosteqnh(ipx_broadhost,ipx->ipx_dna.x_host)) {
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if ((!ipx_neteq(ipx->ipx_dna, ipx->ipx_sna)) &&
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(!ipx_neteqnn(ipx->ipx_dna.x_net, ipx_broadnet)) &&
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(!ipx_neteqnn(ipx->ipx_sna.x_net, ipx_zeronet)) &&
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(!ipx_neteqnn(ipx->ipx_dna.x_net, ipx_zeronet)) ) {
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/*
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* If it is a broadcast to the net where it was
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* received from, treat it as ours.
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*/
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for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
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if((ia->ia_ifa.ifa_ifp == m->m_pkthdr.rcvif) &&
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ipx_neteq(ia->ia_addr.sipx_addr,
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ipx->ipx_dna))
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goto ours;
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/*
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* Look to see if I need to eat this packet.
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* Algorithm is to forward all young packets
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* and prematurely age any packets which will
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* by physically broadcasted.
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* Any very old packets eaten without forwarding
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* would die anyway.
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*
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* Suggestion of Bill Nesheim, Cornell U.
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*/
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if (ipx->ipx_tc < IPX_MAXHOPS) {
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ipx_forward(m);
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goto next;
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}
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}
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/*
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* Is this our packet? If not, forward.
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*/
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} else {
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for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
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if (ipx_hosteq(ipx->ipx_dna, ia->ia_addr.sipx_addr) &&
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(ipx_neteq(ipx->ipx_dna, ia->ia_addr.sipx_addr) ||
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ipx_neteqnn(ipx->ipx_dna.x_net, ipx_zeronet)))
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break;
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if (ia == NULL) {
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ipx_forward(m);
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goto next;
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}
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}
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ours:
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/*
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* Locate pcb for datagram.
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*/
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ipxp = ipx_pcblookup(&ipx->ipx_sna, ipx->ipx_dna.x_port, IPX_WILDCARD);
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/*
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* Switch out to protocol's input routine.
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*/
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if (ipxp != NULL) {
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if (oddshortpacket) {
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m_adj(m, -1);
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}
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ipxstat.ipxs_delivered++;
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if ((ipxp->ipxp_flags & IPXP_ALL_PACKETS) == 0)
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switch (ipx->ipx_pt) {
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case IPXPROTO_SPX:
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spx_input(m, ipxp);
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goto next;
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}
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ipx_input(m, ipxp);
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} else
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goto bad;
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goto next;
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bad:
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m_freem(m);
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goto next;
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}
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void
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ipx_ctlinput(cmd, arg_as_sa, dummy)
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int cmd;
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struct sockaddr *arg_as_sa; /* XXX should be swapped with dummy */
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void *dummy;
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{
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caddr_t arg = (/* XXX */ caddr_t)arg_as_sa;
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struct ipx_addr *ipx;
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if (cmd < 0 || cmd > PRC_NCMDS)
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return;
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switch (cmd) {
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struct sockaddr_ipx *sipx;
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case PRC_IFDOWN:
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case PRC_HOSTDEAD:
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case PRC_HOSTUNREACH:
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sipx = (struct sockaddr_ipx *)arg;
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if (sipx->sipx_family != AF_IPX)
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return;
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ipx = &sipx->sipx_addr;
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break;
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default:
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printf("ipx_ctlinput: cmd %d.\n", cmd);
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break;
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}
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}
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/*
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* Forward a packet. If some error occurs drop the packet. IPX don't
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* have a way to return errors to the sender.
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*/
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static struct route ipx_droute;
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static struct route ipx_sroute;
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static void
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ipx_forward(m)
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struct mbuf *m;
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{
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register struct ipx *ipx = mtod(m, struct ipx *);
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register int error;
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struct mbuf *mcopy = NULL;
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int agedelta = 1;
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int flags = IPX_FORWARDING;
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int ok_there = 0;
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int ok_back = 0;
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if (ipxforwarding == 0) {
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/* can't tell difference between net and host */
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ipxstat.ipxs_cantforward++;
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m_freem(m);
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goto cleanup;
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}
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ipx->ipx_tc++;
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if (ipx->ipx_tc > IPX_MAXHOPS) {
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ipxstat.ipxs_cantforward++;
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m_freem(m);
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goto cleanup;
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}
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if ((ok_there = ipx_do_route(&ipx->ipx_dna,&ipx_droute)) == 0) {
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ipxstat.ipxs_noroute++;
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m_freem(m);
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goto cleanup;
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}
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/*
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* Here we think about forwarding broadcast packets,
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* so we try to insure that it doesn't go back out
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* on the interface it came in on. Also, if we
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* are going to physically broadcast this, let us
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* age the packet so we can eat it safely the second time around.
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*/
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if (ipx->ipx_dna.x_host.c_host[0] & 0x1) {
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struct ipx_ifaddr *ia = ipx_iaonnetof(&ipx->ipx_dna);
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struct ifnet *ifp;
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if (ia != NULL) {
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/* I'm gonna hafta eat this packet */
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agedelta += IPX_MAXHOPS - ipx->ipx_tc;
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ipx->ipx_tc = IPX_MAXHOPS;
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}
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if ((ok_back = ipx_do_route(&ipx->ipx_sna,&ipx_sroute)) == 0) {
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/* error = ENETUNREACH; He'll never get it! */
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ipxstat.ipxs_noroute++;
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m_freem(m);
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goto cleanup;
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}
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if (ipx_droute.ro_rt &&
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(ifp = ipx_droute.ro_rt->rt_ifp) &&
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ipx_sroute.ro_rt &&
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(ifp != ipx_sroute.ro_rt->rt_ifp)) {
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flags |= IPX_ALLOWBROADCAST;
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} else {
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ipxstat.ipxs_noroute++;
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m_freem(m);
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goto cleanup;
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}
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}
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/* XXX
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* I think the checksum generation is bogus. According to the NLSP
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* spec the ipx_tc (hop count) field and the ipx_sum should be
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* zero'ed before generating the checksum, ie. it should not be
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* necesary to recompute it in the forwarding function.
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*/
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/* need to adjust checksum */
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if (ipxcksum && ipx->ipx_sum != 0xffff) {
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union bytes {
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u_char c[4];
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u_short s[2];
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long l;
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} x;
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register int shift;
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x.l = 0;
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x.c[0] = agedelta;
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shift = (((((int)ntohs(ipx->ipx_len)) + 1) >> 1) - 2) & 0xf;
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x.l = ipx->ipx_sum + (x.s[0] << shift);
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x.l = x.s[0] + x.s[1];
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x.l = x.s[0] + x.s[1];
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if (x.l == 0xffff)
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ipx->ipx_sum = 0;
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else
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ipx->ipx_sum = x.l;
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} else
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ipx->ipx_sum = 0xffff;
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error = ipx_outputfl(m, &ipx_droute, flags);
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if (error == 0) {
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ipxstat.ipxs_forward++;
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if (ipxprintfs) {
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printf("forward: ");
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ipx_printhost(&ipx->ipx_sna);
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printf(" to ");
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ipx_printhost(&ipx->ipx_dna);
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printf(" hops %d\n", ipx->ipx_tc);
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}
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} else if (mcopy != NULL) {
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ipx = mtod(mcopy, struct ipx *);
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switch (error) {
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case ENETUNREACH:
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case EHOSTDOWN:
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case EHOSTUNREACH:
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case ENETDOWN:
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case EPERM:
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ipxstat.ipxs_noroute++;
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break;
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case EMSGSIZE:
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ipxstat.ipxs_mtutoosmall++;
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break;
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case ENOBUFS:
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ipxstat.ipxs_odropped++;
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break;
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}
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mcopy = NULL;
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m_freem(m);
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}
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cleanup:
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if (ok_there)
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ipx_undo_route(&ipx_droute);
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if (ok_back)
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ipx_undo_route(&ipx_sroute);
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if (mcopy != NULL)
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m_freem(mcopy);
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}
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static int
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ipx_do_route(src, ro)
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struct ipx_addr *src;
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struct route *ro;
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{
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struct sockaddr_ipx *dst;
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bzero((caddr_t)ro, sizeof(*ro));
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dst = (struct sockaddr_ipx *)&ro->ro_dst;
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dst->sipx_len = sizeof(*dst);
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dst->sipx_family = AF_IPX;
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dst->sipx_addr = *src;
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dst->sipx_addr.x_port = 0;
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rtalloc(ro);
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if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL) {
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return (0);
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}
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ro->ro_rt->rt_use++;
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return (1);
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}
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static void
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ipx_undo_route(ro)
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register struct route *ro;
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{
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if (ro->ro_rt != NULL) {
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RTFREE(ro->ro_rt);
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}
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}
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void
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ipx_watch_output(m, ifp)
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struct mbuf *m;
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struct ifnet *ifp;
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{
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register struct ipxpcb *ipxp;
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register struct ifaddr *ifa;
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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))
|
|
for(ifa = ifp->if_addrhead.tqh_first; ifa != NULL;
|
|
ifa = ifa->ifa_link.tqe_next) {
|
|
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);
|
|
}
|
|
}
|
|
}
|