summaryrefslogtreecommitdiff
path: root/sys/netipx/ipx_input.c
blob: 132cdb811a70e9a8baaa352df4b87df29a9f6833 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
/*	$OpenBSD: ipx_input.c,v 1.8 2000/01/11 20:56:15 fgsch Exp $	*/

/*-
 *
 * Copyright (c) 1996 Michael Shalayeff
 * 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
 *
 * from FreeBSD Id: ipx_input.c,v 1.8 1996/03/11 15:13:48 davidg Exp
 */

#include <sys/param.h>
#include <sys/queue.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <vm/vm.h>

#include <net/if.h>
#include <net/route.h>
#include <net/netisr.h>
#include <net/raw_cb.h>

#include <netipx/ipx.h>
#include <netipx/spx.h>
#include <netipx/ipx_if.h>
#include <netipx/ipx_pcb.h>
#include <netipx/ipx_var.h>

#ifndef IPXPRINTFS
#define IPXPRINTFS	1	/* printing forwarding information */
#endif

int ipxprintfs = IPXPRINTFS;
int ipxcksum = 0;
int ipxdonosocks = 0;
int ipxforwarding = 0;
int 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_int16_t	allones[] = {0xffff, 0xffff, 0xffff};

#ifndef	IPXCBHASHSIZE
#define	IPXCBHASHSIZE	32
#endif
struct ipxpcbtable	ipxrawcbtable;
int			ipxrawcbhashsize = IPXCBHASHSIZE;

struct ipx_ifaddrhead	ipx_ifaddr;
struct ifqueue	ipxintrq;
int	ipxqmaxlen = IFQ_MAXLEN;

u_long	ipx_pexseq;

/*
 * IPX initialization.
 */

void
ipx_init()
{
	ipx_broadnet = * (union ipx_net *) allones;
	ipx_broadhost = * (union ipx_host *) allones;

	ipx_pexseq = time.tv_usec;
	ipxintrq.ifq_maxlen = ipxqmaxlen;

	ipx_netmask.sipx_len = 6;
	ipx_netmask.sipx_addr.ipx_net = ipx_broadnet;

	ipx_hostmask.sipx_len = 12;
	ipx_hostmask.sipx_addr.ipx_net = ipx_broadnet;
	ipx_hostmask.sipx_addr.ipx_host = ipx_broadhost;

	ipx_pcbinit(&ipxrawcbtable, ipxrawcbhashsize);

	TAILQ_INIT(&ipx_ifaddr);
}

/*
 * 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;
	}

	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 = ipxrawcbtable.ipxpt_queue.cqh_first;
	     ipxp != (struct ipxpcb *)&ipxrawcbtable.ipxpt_queue;
	     ipxp = ipxp->ipxp_queue.cqe_next) {
		struct mbuf *m1 = m_copy(m, 0, (int)M_COPYALL);
		if (m1)
			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_PPROP) {
		if (ipxnetbios) {
			ipx_output_type20(m);
			goto next;
		} else
			goto bad;
	}

	/*
	 * Is this a directed broadcast?
	 */
	if (ipx_hosteqnh(ipx_broadhost,ipx->ipx_dna.ipx_host)) {
		if ((!ipx_neteq(ipx->ipx_dna, ipx->ipx_sna)) &&
		    (!ipx_neteqnn(ipx->ipx_dna.ipx_net, ipx_broadnet)) &&
		    (!ipx_neteqnn(ipx->ipx_sna.ipx_net, ipx_zeronet)) &&
		    (!ipx_neteqnn(ipx->ipx_dna.ipx_net, ipx_zeronet)) ) {
			/*
			 * If it is a broadcast to the net where it was
			 * received from, treat it as ours.
			 */
			for (ia = ipx_ifaddr.tqh_first; ia;
			    ia = ia->ia_list.tqe_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.tqh_first; ia; ia = ia->ia_list.tqe_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.ipx_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.ipx_port,
	    IPX_WILDCARD);
	/*
	 * Switch out to protocol's input routine.
	 */
	if (ipxp) {
		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 NULL;
	switch (cmd) {
		struct sockaddr_ipx *sipx;

	case PRC_IFDOWN:
	case PRC_HOSTDEAD:
	case PRC_HOSTUNREACH:
		sipx = (struct sockaddr_ipx *)arg;
		if (sipx == NULL || sipx->sipx_family != AF_IPX)
			return NULL;
		ipx = &sipx->sipx_addr;
		break;

	default:
		break;
	}
	return NULL;
}

/*
 * Forward a packet.  If some error occurs return the sender
 * an error packet.  Note we can't always generate a meaningful
 * error message because the IPX errors don't have a large enough repetoire
 * of codes and types.
 */
struct route ipx_droute;
struct route ipx_sroute;

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) {
		m_freem(m);
		goto cleanup;
	}
	ipx->ipx_tc++;
	if (ipx->ipx_tc > IPX_MAXHOPS) {
		m_freem(m);
		goto cleanup;
	}

	if ((ok_there = ipx_do_route(&ipx->ipx_dna,&ipx_droute))==0) {
		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.ipx_host.c_host[0] & 0x1) {
		struct ipx_ifaddr *ia = ipx_iaonnetof(&ipx->ipx_dna);
		struct ifnet *ifp;
		if (ia) {
			/* 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! */
			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 {
			m_freem(m);
			goto cleanup;
		}
	}
	/* need to adjust checksum */
	if (ipxcksum && ipx->ipx_sum != 0xffff) {
		union bytes {
			u_char c[4];
			u_short s[2];
			long l;
		} x;
		register int shift;
		x.l = 0; x.c[0] = agedelta;
		shift = (((((int)ntohs(ipx->ipx_len))+1)>>1)-2) & 0xf;
		x.l = ipx->ipx_sum + (x.s[0] << shift);
		x.l = x.s[0] + x.s[1];
		x.l = x.s[0] + x.s[1];
		if (x.l==0xffff) ipx->ipx_sum = 0; else ipx->ipx_sum = x.l;
	} else 
		ipx->ipx_sum = 0xffff;

	error = ipx_outputfl(m, &ipx_droute, flags);
	if (error == 0) {
		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:
			break;

		case EMSGSIZE:
			break;

		case ENOBUFS:
			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);
}

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.ipx_port = 0;
	rtalloc(ro);
	if (ro->ro_rt == 0 || ro->ro_rt->rt_ifp == 0) {
		return (0);
	}
	ro->ro_rt->rt_use++;
	return (1);
}

void
ipx_undo_route(ro)
register struct route *ro;
{
	if (ro->ro_rt) {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 = ipxrawcbtable.ipxpt_queue.cqh_first;
	    ipxp != (struct ipxpcb *)&ipxrawcbtable.ipxpt_queue;
	    ipxp = ipxp->ipxp_queue.cqe_next) {
		struct mbuf *m0 = m_copy(m, 0, (int)M_COPYALL);
		if (m0) {
			register struct ipx *ipx;

			M_PREPEND(m0, sizeof (*ipx), M_DONTWAIT);
			if (m0 == NULL)
				continue;
			ipx = mtod(m0, struct ipx *);
			ipx->ipx_sna.ipx_net = ipx_zeronet;
			for (ia = ipx_ifaddr.tqh_first; ia;
			    ia = ia->ia_list.tqe_next)
				if (ifp == ia->ia_ifp)
					break;
			if (ia == NULL)
				ipx->ipx_sna.ipx_host = ipx_zerohost;
			else
				ipx->ipx_sna.ipx_host =
				    ia->ia_addr.sipx_addr.ipx_host;

			if (ifp && (ifp->if_flags & IFF_POINTOPOINT))
			    for(ifa = ifp->if_addrlist.tqh_first; ifa;
					ifa = ifa->ifa_list.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);
		}
	}
}