summaryrefslogtreecommitdiffstats
path: root/sys/netipsec/keysock.c
blob: cc1214ba59bf9d131989273cb54d15f9aa123174 (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
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
/*	$FreeBSD$	*/
/*	$KAME: keysock.c,v 1.25 2001/08/13 20:07:41 itojun Exp $	*/

/*-
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * 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 project 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 PROJECT 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 PROJECT 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.
 */

#include "opt_ipsec.h"

/* This code has derived from sys/net/rtsock.c on FreeBSD2.2.5 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/domain.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/priv.h>
#include <sys/protosw.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/systm.h>

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

#include <net/pfkeyv2.h>
#include <netipsec/key.h>
#include <netipsec/keysock.h>
#include <netipsec/key_debug.h>

#include <machine/stdarg.h>

struct key_cb {
	int key_count;
	int any_count;
};
static struct key_cb key_cb;

static struct sockaddr key_dst = { 2, PF_KEY, };
static struct sockaddr key_src = { 2, PF_KEY, };

static int key_sendup0 __P((struct rawcb *, struct mbuf *, int));

struct pfkeystat pfkeystat;

/*
 * key_output()
 */
int
key_output(struct mbuf *m, struct socket *so)
{
	struct sadb_msg *msg;
	int len, error = 0;

	if (m == 0)
		panic("%s: NULL pointer was passed.\n", __func__);

	pfkeystat.out_total++;
	pfkeystat.out_bytes += m->m_pkthdr.len;

	len = m->m_pkthdr.len;
	if (len < sizeof(struct sadb_msg)) {
		pfkeystat.out_tooshort++;
		error = EINVAL;
		goto end;
	}

	if (m->m_len < sizeof(struct sadb_msg)) {
		if ((m = m_pullup(m, sizeof(struct sadb_msg))) == 0) {
			pfkeystat.out_nomem++;
			error = ENOBUFS;
			goto end;
		}
	}

	M_ASSERTPKTHDR(m);

	KEYDEBUG(KEYDEBUG_KEY_DUMP, kdebug_mbuf(m));

	msg = mtod(m, struct sadb_msg *);
	pfkeystat.out_msgtype[msg->sadb_msg_type]++;
	if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
		pfkeystat.out_invlen++;
		error = EINVAL;
		goto end;
	}

	error = key_parse(m, so);
	m = NULL;
end:
	if (m)
		m_freem(m);
	return error;
}

/*
 * send message to the socket.
 */
static int
key_sendup0(rp, m, promisc)
	struct rawcb *rp;
	struct mbuf *m;
	int promisc;
{
	int error;

	if (promisc) {
		struct sadb_msg *pmsg;

		M_PREPEND(m, sizeof(struct sadb_msg), M_DONTWAIT);
		if (m && m->m_len < sizeof(struct sadb_msg))
			m = m_pullup(m, sizeof(struct sadb_msg));
		if (!m) {
			pfkeystat.in_nomem++;
			m_freem(m);
			return ENOBUFS;
		}
		m->m_pkthdr.len += sizeof(*pmsg);

		pmsg = mtod(m, struct sadb_msg *);
		bzero(pmsg, sizeof(*pmsg));
		pmsg->sadb_msg_version = PF_KEY_V2;
		pmsg->sadb_msg_type = SADB_X_PROMISC;
		pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
		/* pid and seq? */

		pfkeystat.in_msgtype[pmsg->sadb_msg_type]++;
	}

	if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src,
	    m, NULL)) {
		pfkeystat.in_nomem++;
		m_freem(m);
		error = ENOBUFS;
	} else
		error = 0;
	sorwakeup(rp->rcb_socket);
	return error;
}

/* XXX this interface should be obsoleted. */
int
key_sendup(so, msg, len, target)
	struct socket *so;
	struct sadb_msg *msg;
	u_int len;
	int target;	/*target of the resulting message*/
{
	struct mbuf *m, *n, *mprev;
	int tlen;

	/* sanity check */
	if (so == 0 || msg == 0)
		panic("%s: NULL pointer was passed.\n", __func__);

	KEYDEBUG(KEYDEBUG_KEY_DUMP,
		printf("%s: \n", __func__);
		kdebug_sadb(msg));

	/*
	 * we increment statistics here, just in case we have ENOBUFS
	 * in this function.
	 */
	pfkeystat.in_total++;
	pfkeystat.in_bytes += len;
	pfkeystat.in_msgtype[msg->sadb_msg_type]++;

	/*
	 * Get mbuf chain whenever possible (not clusters),
	 * to save socket buffer.  We'll be generating many SADB_ACQUIRE
	 * messages to listening key sockets.  If we simply allocate clusters,
	 * sbappendaddr() will raise ENOBUFS due to too little sbspace().
	 * sbspace() computes # of actual data bytes AND mbuf region.
	 *
	 * TODO: SADB_ACQUIRE filters should be implemented.
	 */
	tlen = len;
	m = mprev = NULL;
	while (tlen > 0) {
		if (tlen == len) {
			MGETHDR(n, M_DONTWAIT, MT_DATA);
			if (n == NULL) {
				pfkeystat.in_nomem++;
				return ENOBUFS;
			}
			n->m_len = MHLEN;
		} else {
			MGET(n, M_DONTWAIT, MT_DATA);
			if (n == NULL) {
				pfkeystat.in_nomem++;
				return ENOBUFS;
			}
			n->m_len = MLEN;
		}
		if (tlen >= MCLBYTES) {	/*XXX better threshold? */
			MCLGET(n, M_DONTWAIT);
			if ((n->m_flags & M_EXT) == 0) {
				m_free(n);
				m_freem(m);
				pfkeystat.in_nomem++;
				return ENOBUFS;
			}
			n->m_len = MCLBYTES;
		}

		if (tlen < n->m_len)
			n->m_len = tlen;
		n->m_next = NULL;
		if (m == NULL)
			m = mprev = n;
		else {
			mprev->m_next = n;
			mprev = n;
		}
		tlen -= n->m_len;
		n = NULL;
	}
	m->m_pkthdr.len = len;
	m->m_pkthdr.rcvif = NULL;
	m_copyback(m, 0, len, (caddr_t)msg);

	/* avoid duplicated statistics */
	pfkeystat.in_total--;
	pfkeystat.in_bytes -= len;
	pfkeystat.in_msgtype[msg->sadb_msg_type]--;

	return key_sendup_mbuf(so, m, target);
}

/* so can be NULL if target != KEY_SENDUP_ONE */
int
key_sendup_mbuf(so, m, target)
	struct socket *so;
	struct mbuf *m;
	int target;
{
	struct mbuf *n;
	struct keycb *kp;
	int sendup;
	struct rawcb *rp;
	int error = 0;

	if (m == NULL)
		panic("key_sendup_mbuf: NULL pointer was passed.\n");
	if (so == NULL && target == KEY_SENDUP_ONE)
		panic("%s: NULL pointer was passed.\n", __func__);

	pfkeystat.in_total++;
	pfkeystat.in_bytes += m->m_pkthdr.len;
	if (m->m_len < sizeof(struct sadb_msg)) {
		m = m_pullup(m, sizeof(struct sadb_msg));
		if (m == NULL) {
			pfkeystat.in_nomem++;
			return ENOBUFS;
		}
	}
	if (m->m_len >= sizeof(struct sadb_msg)) {
		struct sadb_msg *msg;
		msg = mtod(m, struct sadb_msg *);
		pfkeystat.in_msgtype[msg->sadb_msg_type]++;
	}
	mtx_lock(&rawcb_mtx);
	LIST_FOREACH(rp, &rawcb_list, list)
	{
		if (rp->rcb_proto.sp_family != PF_KEY)
			continue;
		if (rp->rcb_proto.sp_protocol
		 && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
			continue;
		}

		kp = (struct keycb *)rp;

		/*
		 * If you are in promiscuous mode, and when you get broadcasted
		 * reply, you'll get two PF_KEY messages.
		 * (based on pf_key@inner.net message on 14 Oct 1998)
		 */
		if (((struct keycb *)rp)->kp_promisc) {
			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
				(void)key_sendup0(rp, n, 1);
				n = NULL;
			}
		}

		/* the exact target will be processed later */
		if (so && sotorawcb(so) == rp)
			continue;

		sendup = 0;
		switch (target) {
		case KEY_SENDUP_ONE:
			/* the statement has no effect */
			if (so && sotorawcb(so) == rp)
				sendup++;
			break;
		case KEY_SENDUP_ALL:
			sendup++;
			break;
		case KEY_SENDUP_REGISTERED:
			if (kp->kp_registered)
				sendup++;
			break;
		}
		pfkeystat.in_msgtarget[target]++;

		if (!sendup)
			continue;

		if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) {
			m_freem(m);
			pfkeystat.in_nomem++;
			mtx_unlock(&rawcb_mtx);
			return ENOBUFS;
		}

		if ((error = key_sendup0(rp, n, 0)) != 0) {
			m_freem(m);
			mtx_unlock(&rawcb_mtx);
			return error;
		}

		n = NULL;
	}

	if (so) {
		error = key_sendup0(sotorawcb(so), m, 0);
		m = NULL;
	} else {
		error = 0;
		m_freem(m);
	}
	mtx_unlock(&rawcb_mtx);
	return error;
}

/*
 * key_abort()
 * derived from net/rtsock.c:rts_abort()
 */
static void
key_abort(struct socket *so)
{
	raw_usrreqs.pru_abort(so);
}

/*
 * key_attach()
 * derived from net/rtsock.c:rts_attach()
 */
static int
key_attach(struct socket *so, int proto, struct thread *td)
{
	struct keycb *kp;
	int error;

	KASSERT(so->so_pcb == NULL, ("key_attach: so_pcb != NULL"));

	if (td != NULL) {
		error = priv_check(td, PRIV_NET_RAW);
		if (error)
			return error;
	}

	/* XXX */
	MALLOC(kp, struct keycb *, sizeof *kp, M_PCB, M_WAITOK | M_ZERO); 
	if (kp == 0)
		return ENOBUFS;

	so->so_pcb = (caddr_t)kp;
	error = raw_attach(so, proto);
	kp = (struct keycb *)sotorawcb(so);
	if (error) {
		free(kp, M_PCB);
		so->so_pcb = (caddr_t) 0;
		return error;
	}

	kp->kp_promisc = kp->kp_registered = 0;

	if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
		key_cb.key_count++;
	key_cb.any_count++;
	kp->kp_raw.rcb_laddr = &key_src;
	kp->kp_raw.rcb_faddr = &key_dst;
	soisconnected(so);
	so->so_options |= SO_USELOOPBACK;

	return 0;
}

/*
 * key_bind()
 * derived from net/rtsock.c:rts_bind()
 */
static int
key_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
{
  return EINVAL;
}

/*
 * key_close()
 * derived from net/rtsock.c:rts_close().
 */
static void
key_close(struct socket *so)
{

	raw_usrreqs.pru_close(so);
}

/*
 * key_connect()
 * derived from net/rtsock.c:rts_connect()
 */
static int
key_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
{
	return EINVAL;
}

/*
 * key_detach()
 * derived from net/rtsock.c:rts_detach()
 */
static void
key_detach(struct socket *so)
{
	struct keycb *kp = (struct keycb *)sotorawcb(so);

	KASSERT(kp != NULL, ("key_detach: kp == NULL"));
	if (kp->kp_raw.rcb_proto.sp_protocol
	    == PF_KEY) /* XXX: AF_KEY */
		key_cb.key_count--;
	key_cb.any_count--;

	key_freereg(so);
	raw_usrreqs.pru_detach(so);
}

/*
 * key_disconnect()
 * derived from net/rtsock.c:key_disconnect()
 */
static int
key_disconnect(struct socket *so)
{
	return(raw_usrreqs.pru_disconnect(so));
}

/*
 * key_peeraddr()
 * derived from net/rtsock.c:rts_peeraddr()
 */
static int
key_peeraddr(struct socket *so, struct sockaddr **nam)
{
	return(raw_usrreqs.pru_peeraddr(so, nam));
}

/*
 * key_send()
 * derived from net/rtsock.c:rts_send()
 */
static int
key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
	 struct mbuf *control, struct thread *td)
{
	return(raw_usrreqs.pru_send(so, flags, m, nam, control, td));
}

/*
 * key_shutdown()
 * derived from net/rtsock.c:rts_shutdown()
 */
static int
key_shutdown(struct socket *so)
{
	return(raw_usrreqs.pru_shutdown(so));
}

/*
 * key_sockaddr()
 * derived from net/rtsock.c:rts_sockaddr()
 */
static int
key_sockaddr(struct socket *so, struct sockaddr **nam)
{
	return(raw_usrreqs.pru_sockaddr(so, nam));
}

struct pr_usrreqs key_usrreqs = {
	.pru_abort =		key_abort,
	.pru_attach =		key_attach,
	.pru_bind =		key_bind,
	.pru_connect =		key_connect,
	.pru_detach =		key_detach,
	.pru_disconnect =	key_disconnect,
	.pru_peeraddr =		key_peeraddr,
	.pru_send =		key_send,
	.pru_shutdown =		key_shutdown,
	.pru_sockaddr =		key_sockaddr,
	.pru_close =		key_close,
};

/* sysctl */
SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");

/*
 * Definitions of protocols supported in the KEY domain.
 */

extern struct domain keydomain;

struct protosw keysw[] = {
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&keydomain,
	.pr_protocol =		PF_KEY_V2,
	.pr_flags =		PR_ATOMIC|PR_ADDR,
	.pr_output =		key_output,
	.pr_ctlinput =		raw_ctlinput,
	.pr_init =		raw_init,
	.pr_usrreqs =		&key_usrreqs
}
};

static void
key_init0(void)
{
	bzero((caddr_t)&key_cb, sizeof(key_cb));
	key_init();
}

struct domain keydomain = {
	.dom_family =		PF_KEY,
	.dom_name =		"key",
	.dom_init =		key_init0,
	.dom_protosw =		keysw,
	.dom_protoswNPROTOSW =	&keysw[sizeof(keysw)/sizeof(keysw[0])]
};

DOMAIN_SET(key);
OpenPOWER on IntegriCloud