summaryrefslogtreecommitdiff
path: root/sys/netipx/ipx_ip.c
blob: 249e23e699bd4a66ebfebd8cef5c520b19449edf (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
/*	$OpenBSD: ipx_ip.c,v 1.18 2004/01/03 14:08:54 espie 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. 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
 *
 * from FreeBSD Id: ipx_ip.c,v 1.7 1996/03/11 15:13:50 davidg Exp
 */

/*
 * Software interface driver for encapsulating IPX in IP.
 */

#ifdef IPXIP
#ifndef INET
#error The option IPXIP requires option INET.
#endif

#include <sys/param.h>
#include <sys/queue.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/protosw.h>

#include <net/if.h>
#include <net/if_types.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 <sys/stdarg.h>

struct ifnet ipxipif;
struct ifnet_en *ipxip_list; /* list of all hosts and gateways or broadcast addrs */

void
ipxipprotoinit(void)
{
	(void) ipxipattach();
}

struct ifnet_en *
ipxipattach(void)
{
	struct ifnet_en *m;
	struct ifnet *ifp;

	if (ipxipif.if_mtu == 0) {
		ifp = &ipxipif;
		snprintf(ifp->if_xname, sizeof ifp->if_xname, "ipx0");
		ifp->if_mtu = LOMTU;
		ifp->if_ioctl = ipxipioctl;
		ifp->if_output = ipxipoutput;
		ifp->if_start = ipxipstart;
		ifp->if_flags = IFF_POINTOPOINT;
		ifp->if_type = IFT_NSIP;
	}

	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;

	snprintf(ifp->if_xname, sizeof ifp->if_xname, "ipx0");
	ifp->if_mtu = LOMTU;
	ifp->if_ioctl = ipxipioctl;
	ifp->if_output = ipxipoutput;
	ifp->if_start = ipxipstart;
	ifp->if_flags = IFF_POINTOPOINT;
	if_attach(ifp);

	return (m);
}


/*
 * Process an ioctl request.
 */
/* ARGSUSED */
int
ipxipioctl(ifp, cmd, data)
	struct ifnet *ifp;
	u_long cmd;
	caddr_t data;
{
	int error = 0;
	struct ifreq *ifr;

	switch (cmd) {

	case SIOCSIFADDR:
		ifp->if_flags |= IFF_UP;
		/* FALLTHROUGH */

	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);
}

struct mbuf *ipxip_badlen;

void
ipxip_input( struct mbuf *m, ...)
{
	struct ifnet *ifp;
	struct ip *ip;
	struct ipx *ipx;
	struct ifqueue *ifq = &ipxintrq;
	int len, s;
	va_list	ap;

	va_start(ap, m);
	ifp = va_arg(ap, struct ifnet *);
	va_end(ap);

	/*
	 * 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 *)0);
		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 (ntohs(ip->ip_len) - (ip->ip_hl << 2) != len) {
		if (len > ntohs(ip->ip_len) - (ip->ip_hl << 2)) {
			ipxipif.if_ierrors++;
			if (ipxip_badlen)
				m_freem(ipxip_badlen);
			ipxip_badlen = m;
			return;
		}
		/* Any extra will be trimmed off by the IPX routines */
	}

	/*
	 * Place interface pointer before the data
	 * for the receiving protocol.
	 */
	m->m_pkthdr.rcvif = ifp;
	/*
	 * 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;
}

/* ARGSUSED */
int
ipxipoutput(ifp, m, dst, rt)
	struct ifnet *ifp;
	struct mbuf *m;
	struct sockaddr *dst;
	struct rtentry *rt;
{
	struct ifnet_en *ifn = (struct ifnet_en *)ifp;
	struct ip *ip;
	struct route *ro = &(ifn->ifen_route);
	int len = 0;
	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 & (long)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;
		m0->m_pkthdr.tags = m->m_pkthdr.tags;
		m->m_flags &= ~M_PKTHDR;
		m_tag_init(m);
	} 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;
	if (len + sizeof(struct ip) > IP_MAXPACKET) {
		m_freem(m);
		return EMSGSIZE;
	}
	ip->ip_len = htons(len + sizeof(struct ip));
	ip->ip_ttl = MAXTTL;

	/*
	 * Output final datagram.
	 */
	error = ip_output(m, NULL, ro, SO_BROADCAST, NULL, NULL, NULL);
	if (error) {
		ifn->ifen_ifnet.if_oerrors++;
		ifn->ifen_ifnet.if_ierrors = error;
	}
	return (error);
}

void
ipxipstart(ifp)
	struct ifnet *ifp;
{
	panic("ipxip_start called");
}

struct ifreq ifr_ipxip = {"ipx0"};

int
ipxip_route(m)
	struct mbuf *m;
{
	struct ipxip_req *rq = mtod(m, struct ipxip_req *);
	struct sockaddr_ipx *ipx_dst = (struct sockaddr_ipx *)&rq->rq_ipx;
	struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip;
	struct route ro;
	struct ifnet_en *ifn;
	struct sockaddr_in *src;

	/*
	 * First, make sure we already have an IPX address.
	 */
	if (ipx_ifaddr.tqh_first == 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?
	 */
	{
		struct in_ifaddr *ia;
		struct ifnet *ifp = ro.ro_rt->rt_ifp;

		for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next)
			if (ia->ia_ifp == ifp)
				break;
		if (ia == NULL)
			ia = in_ifaddr.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; 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_dstaddr = * (struct sockaddr *) ipx_dst;
	ipx_control((struct socket *)0, (int)SIOCSIFDSTADDR,
		(caddr_t)&ifr_ipxip, (struct ifnet *)ifn);

	satoipx_addr(ifr_ipxip.ifr_addr).ipx_host =
	    ipx_ifaddr.tqh_first->ia_addr.sipx_addr.ipx_host;

	return (ipx_control((struct socket *)0, (int)SIOCSIFADDR,
			(caddr_t)&ifr_ipxip, (struct ifnet *)ifn));
}

int
ipxip_free(ifp)
	struct ifnet *ifp;
{
	struct ifnet_en *ifn = (struct ifnet_en *)ifp;
	struct route *ro = & ifn->ifen_route;

	if (ro->ro_rt) {
		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 NULL;
	if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
		return NULL;
	sin = (struct sockaddr_in *)sa;
	if (sin->sin_addr.s_addr == INADDR_ANY)
		return NULL;

	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;
	}
	return NULL;
}

void
ipxip_rtchange(dst)
	struct in_addr *dst;
{
	struct ifnet_en *ifn;

	for (ifn = ipxip_list; ifn; ifn = ifn->ifen_next) {
		if (ifn->ifen_dst.s_addr == dst->s_addr &&
		    ifn->ifen_route.ro_rt) {
			RTFREE(ifn->ifen_route.ro_rt);
			ifn->ifen_route.ro_rt = NULL;
		}
	}
}
#endif /* IPXIP */