summaryrefslogtreecommitdiffstats
path: root/sys/netinet/if_atm.c
blob: c46460e11bc3f6a070b627f6233d5de8cb481f07 (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
/*      $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos Exp $       */

/*-
 *
 * Copyright (c) 1996 Charles D. Cranor and Washington University.
 * 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 Charles D. Cranor and
 *      Washington University.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * IP <=> ATM address resolution.
 */
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_natm.h"

#if defined(INET) || defined(INET6)

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/queue.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/syslog.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/if_atm.h>

#include <netinet/in.h>
#include <netinet/if_atm.h>

#ifdef NATM
#include <netnatm/natm.h>
#endif

#define SDL(s) ((struct sockaddr_dl *)s)

#define	GET3BYTE(V, A, L)	do {				\
	(V) = ((A)[0] << 16) | ((A)[1] << 8) | (A)[2];		\
	(A) += 3;						\
	(L) -= 3;						\
    } while (0)

#define GET2BYTE(V, A, L)	do {				\
	(V) = ((A)[0] << 8) | (A)[1];				\
	(A) += 2;						\
	(L) -= 2;						\
    } while (0)

#define GET1BYTE(V, A, L)	do {				\
	(V) = *(A)++;						\
	(L)--;							\
    } while (0)


/*
 * atm_rtrequest: handle ATM rt request (in support of generic code)
 *   inputs: "req" = request code
 *           "rt" = route entry
 *           "info" = rt_addrinfo
 */
void
atm_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
{
	struct sockaddr *gate = rt->rt_gateway;
	struct atmio_openvcc op;
	struct atmio_closevcc cl;
	u_char *addr;
	u_int alen;
#ifdef NATM
	struct sockaddr_in *sin;
	struct natmpcb *npcb = NULL;
#endif
	static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};

	if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
		return;

	switch (req) {

	case RTM_RESOLVE: /* resolve: only happens when cloning */
		printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
		break;

	case RTM_ADD:
		/*
		 * route added by a command (e.g. ifconfig, route, arp...).
		 *
		 * first check to see if this is not a host route, in which
		 * case we are being called via "ifconfig" to set the address.
		 */
		if ((rt->rt_flags & RTF_HOST) == 0) {
			rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
			gate = rt->rt_gateway;
			SDL(gate)->sdl_type = rt->rt_ifp->if_type;
			SDL(gate)->sdl_index = rt->rt_ifp->if_index;
			break;
		}

		if (gate->sa_family != AF_LINK ||
		    gate->sa_len < sizeof(null_sdl)) {
			log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
			break;
		}

		KASSERT(rt->rt_ifp->if_ioctl != NULL,
		    ("atm_rtrequest: null ioctl"));

		/*
		 * Parse and verify the link level address as
		 * an open request
		 */
#ifdef NATM
		NATM_LOCK();
#endif
		bzero(&op, sizeof(op));
		addr = LLADDR(SDL(gate));
		alen = SDL(gate)->sdl_alen;
		if (alen < 4) {
			printf("%s: bad link-level address\n", __func__);
			goto failed;
		}

		if (alen == 4) {
			/* old type address */
			GET1BYTE(op.param.flags, addr, alen);
			GET1BYTE(op.param.vpi, addr, alen);
			GET2BYTE(op.param.vci, addr, alen);
			op.param.traffic = ATMIO_TRAFFIC_UBR;
			op.param.aal = (op.param.flags & ATM_PH_AAL5) ?
			    ATMIO_AAL_5 : ATMIO_AAL_0;
		} else {
			/* new address */
			op.param.aal = ATMIO_AAL_5;

			GET1BYTE(op.param.flags, addr, alen);
			op.param.flags &= ATM_PH_LLCSNAP;

			GET1BYTE(op.param.vpi, addr, alen);
			GET2BYTE(op.param.vci, addr, alen);

			GET1BYTE(op.param.traffic, addr, alen);

			switch (op.param.traffic) {

			  case ATMIO_TRAFFIC_UBR:
				if (alen >= 3)
					GET3BYTE(op.param.tparam.pcr,
					    addr, alen);
				break;

			  case ATMIO_TRAFFIC_CBR:
				if (alen < 3)
					goto bad_param;
				GET3BYTE(op.param.tparam.pcr, addr, alen);
				break;

			  case ATMIO_TRAFFIC_VBR:
				if (alen < 3 * 3)
					goto bad_param;
				GET3BYTE(op.param.tparam.pcr, addr, alen);
				GET3BYTE(op.param.tparam.scr, addr, alen);
				GET3BYTE(op.param.tparam.mbs, addr, alen);
				break;

			  case ATMIO_TRAFFIC_ABR:
				if (alen < 4 * 3 + 2 + 1 * 2 + 3)
					goto bad_param;
				GET3BYTE(op.param.tparam.pcr, addr, alen);
				GET3BYTE(op.param.tparam.mcr, addr, alen);
				GET3BYTE(op.param.tparam.icr, addr, alen);
				GET3BYTE(op.param.tparam.tbe, addr, alen);
				GET1BYTE(op.param.tparam.nrm, addr, alen);
				GET1BYTE(op.param.tparam.trm, addr, alen);
				GET2BYTE(op.param.tparam.adtf, addr, alen);
				GET1BYTE(op.param.tparam.rif, addr, alen);
				GET1BYTE(op.param.tparam.rdf, addr, alen);
				GET1BYTE(op.param.tparam.cdf, addr, alen);
				break;

			  default:
			  bad_param:
				printf("%s: bad traffic params\n", __func__);
				goto failed;
			}
		}
		op.param.rmtu = op.param.tmtu = rt->rt_ifp->if_mtu;
#ifdef NATM
		/*
		 * let native ATM know we are using this VCI/VPI
		 * (i.e. reserve it)
		 */
		sin = (struct sockaddr_in *) rt_key(rt);
		if (sin->sin_family != AF_INET)
			goto failed;
		npcb = npcb_add(NULL, rt->rt_ifp, op.param.vci,  op.param.vpi);
		if (npcb == NULL)
			goto failed;
		npcb->npcb_flags |= NPCB_IP;
		npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
		/* XXX: move npcb to llinfo when ATM ARP is ready */
#ifdef __notyet_restored__
		rt->rt_llinfo = (caddr_t) npcb;
#endif
		rt->rt_flags |= RTF_LLINFO;
#endif
		/*
		 * let the lower level know this circuit is active
		 */
		op.rxhand = NULL;
		op.param.flags |= ATMIO_FLAG_ASYNC;
		if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMOPENVCC,
		    (caddr_t)&op) != 0) {
			printf("atm: couldn't add VC\n");
			goto failed;
		}

		SDL(gate)->sdl_type = rt->rt_ifp->if_type;
		SDL(gate)->sdl_index = rt->rt_ifp->if_index;

#ifdef NATM
		NATM_UNLOCK();
#endif
		break;

failed:
#ifdef NATM
		if (npcb) {
			npcb_free(npcb, NPCB_DESTROY);
#ifdef __notyet_restored__
			rt->rt_llinfo = NULL;
#endif
			rt->rt_flags &= ~RTF_LLINFO;
		}
		NATM_UNLOCK();
#endif
		/* mark as invalid. We cannot RTM_DELETE the route from
		 * here, because the recursive call to rtrequest1 does
		 * not really work. */
		rt->rt_flags |= RTF_REJECT;
		break;

	case RTM_DELETE:
#ifdef NATM
		/*
		 * tell native ATM we are done with this VC
		 */
		if (rt->rt_flags & RTF_LLINFO) {
			NATM_LOCK();
#ifdef __notyet_restored__
			npcb_free((struct natmpcb *)rt->rt_llinfo,
			    NPCB_DESTROY);
			rt->rt_llinfo = NULL;
#endif
			rt->rt_flags &= ~RTF_LLINFO;
			NATM_UNLOCK();
		}
#endif
		/*
		 * tell the lower layer to disable this circuit
		 */
		bzero(&op, sizeof(op));
		addr = LLADDR(SDL(gate));
		addr++;
		cl.vpi = *addr++;
		cl.vci = *addr++ << 8;
		cl.vci |= *addr++;
		(void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMCLOSEVCC,
		    (caddr_t)&cl);
		break;
	}
}

/*
 * atmresolve:
 *   inputs:
 *     [1] "rt" = the link level route to use (or null if need to look one up)
 *     [2] "m" = mbuf containing the data to be sent
 *     [3] "dst" = sockaddr_in (IP) address of dest.
 *   output:
 *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
 *   return:
 *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
 *     1 == resolve OK; desten contains result
 *
 *   XXX: will need more work if we wish to support ATMARP in the kernel,
 *   but this is enough for PVCs entered via the "route" command.
 */
int
atmresolve(struct rtentry *rt, struct mbuf *m, struct sockaddr *dst,
    struct atm_pseudohdr *desten)
{
	struct sockaddr_dl *sdl;

	if (m->m_flags & (M_BCAST | M_MCAST)) {
		log(LOG_INFO,
		    "atmresolve: BCAST/MCAST packet detected/dumped\n");
		goto bad;
	}

	if (rt == NULL) {
		rt = RTALLOC1(dst, 0); /* link level on table 0 XXX MRT */
		if (rt == NULL)
			goto bad;	/* failed */
		RT_REMREF(rt);		/* don't keep LL references */
		if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
		    rt->rt_gateway->sa_family != AF_LINK) {
			RT_UNLOCK(rt);
			goto bad;
		}
		RT_UNLOCK(rt);
	}

	/*
	 * note that rt_gateway is a sockaddr_dl which contains the
	 * atm_pseudohdr data structure for this route.   we currently
	 * don't need any rt_llinfo info (but will if we want to support
	 * ATM ARP [c.f. if_ether.c]).
	 */
	sdl = SDL(rt->rt_gateway);

	/*
	 * Check the address family and length is valid, the address
	 * is resolved; otherwise, try to resolve.
	 */
	if (sdl->sdl_family == AF_LINK && sdl->sdl_alen >= sizeof(*desten)) {
		bcopy(LLADDR(sdl), desten, sizeof(*desten));
		return (1);	/* ok, go for it! */
	}

	/*
	 * we got an entry, but it doesn't have valid link address
	 * info in it (it is prob. the interface route, which has
	 * sdl_alen == 0).    dump packet.  (fall through to "bad").
	 */
bad:
	m_freem(m);
	return (0);
}
#endif /* INET */
OpenPOWER on IntegriCloud