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1c79356b
A
1/* $KAME: keysock.c,v 1.13 2000/03/25 07:24:13 sumikawa Exp $ */
2
3/*
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
1c79356b
A
32/* This code has derived from sys/net/rtsock.c on FreeBSD2.2.5 */
33
1c79356b
A
34#include <sys/types.h>
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/kernel.h>
1c79356b 38#include <sys/sysctl.h>
1c79356b 39#include <sys/mbuf.h>
1c79356b 40#include <sys/malloc.h>
1c79356b
A
41#include <sys/socket.h>
42#include <sys/socketvar.h>
43#include <sys/domain.h>
44#include <sys/protosw.h>
45#include <sys/errno.h>
1c79356b 46
1c79356b
A
47
48#include <net/raw_cb.h>
49#include <net/route.h>
50
51#include <net/pfkeyv2.h>
52#include <netkey/keydb.h>
53#include <netkey/key.h>
54#include <netkey/keysock.h>
55#include <netkey/key_debug.h>
56
1c79356b
A
57struct sockaddr key_dst = { 2, PF_KEY, };
58struct sockaddr key_src = { 2, PF_KEY, };
1c79356b
A
59
60static int key_sendup0 __P((struct rawcb *, struct mbuf *, int));
61
62struct pfkeystat pfkeystat;
63
1c79356b 64/*
9bccf70c 65 * key_output()
1c79356b 66 */
1c79356b 67int
9bccf70c
A
68#ifdef __APPLE__
69/* No variable argument support? */
70key_output(struct mbuf *m, struct socket *so)
1c79356b 71#else
9bccf70c
A
72#if __STDC__
73key_output(struct mbuf *m, ...)
1c79356b 74#else
9bccf70c
A
75key_output(m, va_alist)
76 struct mbuf *m;
77 va_dcl
1c79356b 78#endif
1c79356b 79#endif
1c79356b 80{
9bccf70c 81 struct sadb_msg *msg;
1c79356b
A
82 int len, error = 0;
83 int s;
9bccf70c
A
84#ifndef __APPLE__
85 struct socket *so;
86 va_list ap;
87
88 va_start(ap, m);
89 so = va_arg(ap, struct socket *);
90 va_end(ap);
91#endif
1c79356b
A
92
93 if (m == 0)
94 panic("key_output: NULL pointer was passed.\n");
95
96 pfkeystat.out_total++;
97 pfkeystat.out_bytes += m->m_pkthdr.len;
98
99 len = m->m_pkthdr.len;
100 if (len < sizeof(struct sadb_msg)) {
101#if IPSEC_DEBUG
102 printf("key_output: Invalid message length.\n");
103#endif
104 pfkeystat.out_tooshort++;
105 error = EINVAL;
106 goto end;
107 }
108
109 if (m->m_len < sizeof(struct sadb_msg)) {
110 if ((m = m_pullup(m, sizeof(struct sadb_msg))) == 0) {
111#if IPSEC_DEBUG
112 printf("key_output: can't pullup mbuf\n");
113#endif
114 pfkeystat.out_nomem++;
115 error = ENOBUFS;
116 goto end;
117 }
118 }
119
120 if ((m->m_flags & M_PKTHDR) == 0)
121 panic("key_output: not M_PKTHDR ??");
122
9bccf70c 123#if IPSEC_DEBUG
1c79356b
A
124 KEYDEBUG(KEYDEBUG_KEY_DUMP, kdebug_mbuf(m));
125#endif /* defined(IPSEC_DEBUG) */
126
127 msg = mtod(m, struct sadb_msg *);
128 pfkeystat.out_msgtype[msg->sadb_msg_type]++;
129 if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
130#if IPSEC_DEBUG
131 printf("key_output: Invalid message length.\n");
132#endif
133 pfkeystat.out_invlen++;
134 error = EINVAL;
135 goto end;
136 }
137
1c79356b 138 /*XXX giant lock*/
1c79356b 139 s = splnet();
9bccf70c
A
140 error = key_parse(m, so);
141 m = NULL;
1c79356b 142 splx(s);
1c79356b 143end:
9bccf70c
A
144 if (m)
145 m_freem(m);
146 return error;
1c79356b
A
147}
148
149/*
150 * send message to the socket.
151 */
152static int
153key_sendup0(rp, m, promisc)
154 struct rawcb *rp;
155 struct mbuf *m;
156 int promisc;
157{
9bccf70c
A
158 int error;
159
1c79356b
A
160 if (promisc) {
161 struct sadb_msg *pmsg;
162
163 M_PREPEND(m, sizeof(struct sadb_msg), M_NOWAIT);
164 if (m && m->m_len < sizeof(struct sadb_msg))
165 m = m_pullup(m, sizeof(struct sadb_msg));
166 if (!m) {
167#if IPSEC_DEBUG
168 printf("key_sendup0: cannot pullup\n");
169#endif
9bccf70c 170 pfkeystat.in_nomem++;
1c79356b
A
171 m_freem(m);
172 return ENOBUFS;
173 }
174 m->m_pkthdr.len += sizeof(*pmsg);
175
176 pmsg = mtod(m, struct sadb_msg *);
177 bzero(pmsg, sizeof(*pmsg));
178 pmsg->sadb_msg_version = PF_KEY_V2;
179 pmsg->sadb_msg_type = SADB_X_PROMISC;
180 pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
181 /* pid and seq? */
182
183 pfkeystat.in_msgtype[pmsg->sadb_msg_type]++;
184 }
185
9bccf70c
A
186 if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src,
187 m, NULL)) {
1c79356b
A
188#if IPSEC_DEBUG
189 printf("key_sendup0: sbappendaddr failed\n");
190#endif
191 pfkeystat.in_nomem++;
192 m_freem(m);
9bccf70c
A
193 error = ENOBUFS;
194 } else
195 error = 0;
1c79356b 196 sorwakeup(rp->rcb_socket);
9bccf70c 197 return error;
1c79356b
A
198}
199
200/* XXX this interface should be obsoleted. */
201int
202key_sendup(so, msg, len, target)
203 struct socket *so;
204 struct sadb_msg *msg;
205 u_int len;
206 int target; /*target of the resulting message*/
207{
208 struct mbuf *m, *n, *mprev;
209 int tlen;
210
211 /* sanity check */
212 if (so == 0 || msg == 0)
213 panic("key_sendup: NULL pointer was passed.\n");
214
215 KEYDEBUG(KEYDEBUG_KEY_DUMP,
216 printf("key_sendup: \n");
217 kdebug_sadb(msg));
218
219 /*
220 * we increment statistics here, just in case we have ENOBUFS
221 * in this function.
222 */
223 pfkeystat.in_total++;
224 pfkeystat.in_bytes += len;
225 pfkeystat.in_msgtype[msg->sadb_msg_type]++;
226
227 /*
228 * Get mbuf chain whenever possible (not clusters),
229 * to save socket buffer. We'll be generating many SADB_ACQUIRE
9bccf70c 230 * messages to listening key sockets. If we simply allocate clusters,
1c79356b
A
231 * sbappendaddr() will raise ENOBUFS due to too little sbspace().
232 * sbspace() computes # of actual data bytes AND mbuf region.
233 *
234 * TODO: SADB_ACQUIRE filters should be implemented.
235 */
236 tlen = len;
237 m = mprev = NULL;
238 while (tlen > 0) {
239 if (tlen == len) {
240 MGETHDR(n, M_DONTWAIT, MT_DATA);
241 n->m_len = MHLEN;
242 } else {
243 MGET(n, M_DONTWAIT, MT_DATA);
244 n->m_len = MLEN;
245 }
246 if (!n) {
247 pfkeystat.in_nomem++;
248 return ENOBUFS;
249 }
250 if (tlen >= MCLBYTES) { /*XXX better threshold? */
251 MCLGET(n, M_DONTWAIT);
252 if ((n->m_flags & M_EXT) == 0) {
253 m_free(n);
254 m_freem(m);
255 pfkeystat.in_nomem++;
256 return ENOBUFS;
257 }
258 n->m_len = MCLBYTES;
259 }
260
261 if (tlen < n->m_len)
262 n->m_len = tlen;
263 n->m_next = NULL;
264 if (m == NULL)
265 m = mprev = n;
266 else {
267 mprev->m_next = n;
268 mprev = n;
269 }
270 tlen -= n->m_len;
271 n = NULL;
272 }
273 m->m_pkthdr.len = len;
274 m->m_pkthdr.rcvif = NULL;
275 m_copyback(m, 0, len, (caddr_t)msg);
276
277 /* avoid duplicated statistics */
278 pfkeystat.in_total--;
279 pfkeystat.in_bytes -= len;
280 pfkeystat.in_msgtype[msg->sadb_msg_type]--;
281
282 return key_sendup_mbuf(so, m, target);
283}
284
9bccf70c 285/* so can be NULL if target != KEY_SENDUP_ONE */
1c79356b
A
286int
287key_sendup_mbuf(so, m, target)
288 struct socket *so;
289 struct mbuf *m;
290 int target;
291{
292 struct mbuf *n;
293 struct keycb *kp;
294 int sendup;
295 struct rawcb *rp;
9bccf70c 296 int error = 0;
1c79356b 297
9bccf70c
A
298 if (m == NULL)
299 panic("key_sendup_mbuf: NULL pointer was passed.\n");
300 if (so == NULL && target == KEY_SENDUP_ONE)
1c79356b
A
301 panic("key_sendup_mbuf: NULL pointer was passed.\n");
302
303 pfkeystat.in_total++;
304 pfkeystat.in_bytes += m->m_pkthdr.len;
305 if (m->m_len < sizeof(struct sadb_msg)) {
306#if 1
307 m = m_pullup(m, sizeof(struct sadb_msg));
308 if (m == NULL) {
309 pfkeystat.in_nomem++;
310 return ENOBUFS;
311 }
312#else
313 /* don't bother pulling it up just for stats */
314#endif
315 }
316 if (m->m_len >= sizeof(struct sadb_msg)) {
317 struct sadb_msg *msg;
318 msg = mtod(m, struct sadb_msg *);
319 pfkeystat.in_msgtype[msg->sadb_msg_type]++;
320 }
321
1c79356b 322 LIST_FOREACH(rp, &rawcb_list, list)
1c79356b
A
323 {
324 if (rp->rcb_proto.sp_family != PF_KEY)
325 continue;
326 if (rp->rcb_proto.sp_protocol
327 && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
328 continue;
329 }
330
331 kp = (struct keycb *)rp;
332
333 /*
334 * If you are in promiscuous mode, and when you get broadcasted
335 * reply, you'll get two PF_KEY messages.
336 * (based on pf_key@inner.net message on 14 Oct 1998)
337 */
338 if (((struct keycb *)rp)->kp_promisc) {
339 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
340 (void)key_sendup0(rp, n, 1);
341 n = NULL;
342 }
343 }
344
345 /* the exact target will be processed later */
9bccf70c 346 if (so && sotorawcb(so) == rp)
1c79356b
A
347 continue;
348
349 sendup = 0;
350 switch (target) {
351 case KEY_SENDUP_ONE:
352 /* the statement has no effect */
9bccf70c 353 if (so && sotorawcb(so) == rp)
1c79356b
A
354 sendup++;
355 break;
356 case KEY_SENDUP_ALL:
357 sendup++;
358 break;
359 case KEY_SENDUP_REGISTERED:
360 if (kp->kp_registered)
361 sendup++;
362 break;
363 }
364 pfkeystat.in_msgtarget[target]++;
365
366 if (!sendup)
367 continue;
368
369 if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) {
370#if IPSEC_DEBUG
371 printf("key_sendup: m_copy fail\n");
372#endif
373 m_freem(m);
374 pfkeystat.in_nomem++;
375 return ENOBUFS;
376 }
377
378 if ((error = key_sendup0(rp, n, 0)) != 0) {
379 m_freem(m);
380 return error;
381 }
382
383 n = NULL;
384 }
385
9bccf70c
A
386 if (so) {
387 error = key_sendup0(sotorawcb(so), m, 0);
388 m = NULL;
389 } else {
390 error = 0;
391 m_freem(m);
392 }
1c79356b
A
393 return error;
394}
395
1c79356b
A
396/*
397 * key_abort()
398 * derived from net/rtsock.c:rts_abort()
399 */
400static int
401key_abort(struct socket *so)
402{
403 int s, error;
404 s = splnet();
405 error = raw_usrreqs.pru_abort(so);
406 splx(s);
407 return error;
408}
409
410/*
411 * key_attach()
412 * derived from net/rtsock.c:rts_attach()
413 */
414static int
415key_attach(struct socket *so, int proto, struct proc *p)
416{
417 struct keycb *kp;
418 int s, error;
419
420 if (sotorawcb(so) != 0)
421 return EISCONN; /* XXX panic? */
422 kp = (struct keycb *)_MALLOC(sizeof *kp, M_PCB, M_WAITOK); /* XXX */
423 if (kp == 0)
424 return ENOBUFS;
425 bzero(kp, sizeof *kp);
426
427 /*
428 * The splnet() is necessary to block protocols from sending
429 * error notifications (like RTM_REDIRECT or RTM_LOSING) while
430 * this PCB is extant but incompletely initialized.
431 * Probably we should try to do more of this work beforehand and
432 * eliminate the spl.
433 */
434 s = splnet();
435 so->so_pcb = (caddr_t)kp;
436 error = raw_usrreqs.pru_attach(so, proto, p);
437 kp = (struct keycb *)sotorawcb(so);
438 if (error) {
439 _FREE(kp, M_PCB);
440 so->so_pcb = (caddr_t) 0;
441 splx(s);
442 printf("key_usrreq: key_usrreq results %d\n", error);
443 return error;
444 }
445
446 kp->kp_promisc = kp->kp_registered = 0;
447
448 if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
449 key_cb.key_count++;
450 key_cb.any_count++;
451 kp->kp_raw.rcb_laddr = &key_src;
452 kp->kp_raw.rcb_faddr = &key_dst;
453 soisconnected(so);
454 so->so_options |= SO_USELOOPBACK;
455
456 splx(s);
457 return 0;
458}
459
460/*
461 * key_bind()
462 * derived from net/rtsock.c:rts_bind()
463 */
464static int
465key_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
466{
467 int s, error;
468 s = splnet();
469 error = raw_usrreqs.pru_bind(so, nam, p); /* xxx just EINVAL */
470 splx(s);
471 return error;
472}
473
474/*
475 * key_connect()
476 * derived from net/rtsock.c:rts_connect()
477 */
478static int
479key_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
480{
481 int s, error;
482 s = splnet();
483 error = raw_usrreqs.pru_connect(so, nam, p); /* XXX just EINVAL */
484 splx(s);
485 return error;
486}
487
488/*
489 * key_detach()
490 * derived from net/rtsock.c:rts_detach()
491 */
492static int
493key_detach(struct socket *so)
494{
495 struct keycb *kp = (struct keycb *)sotorawcb(so);
496 int s, error;
497
498 s = splnet();
499 if (kp != 0) {
500 if (kp->kp_raw.rcb_proto.sp_protocol
501 == PF_KEY) /* XXX: AF_KEY */
502 key_cb.key_count--;
503 key_cb.any_count--;
504
505 key_freereg(so);
506 }
507 error = raw_usrreqs.pru_detach(so);
508 splx(s);
509 return error;
510}
511
512/*
513 * key_disconnect()
514 * derived from net/rtsock.c:key_disconnect()
515 */
516static int
517key_disconnect(struct socket *so)
518{
519 int s, error;
520 s = splnet();
521 error = raw_usrreqs.pru_disconnect(so);
522 splx(s);
523 return error;
524}
525
526/*
527 * key_peeraddr()
528 * derived from net/rtsock.c:rts_peeraddr()
529 */
530static int
531key_peeraddr(struct socket *so, struct sockaddr **nam)
532{
533 int s, error;
534 s = splnet();
535 error = raw_usrreqs.pru_peeraddr(so, nam);
536 splx(s);
537 return error;
538}
539
540/*
541 * key_send()
542 * derived from net/rtsock.c:rts_send()
543 */
544static int
545key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
546 struct mbuf *control, struct proc *p)
547{
548 int s, error;
549 s = splnet();
550 error = raw_usrreqs.pru_send(so, flags, m, nam, control, p);
551 splx(s);
552 return error;
553}
554
555/*
556 * key_shutdown()
557 * derived from net/rtsock.c:rts_shutdown()
558 */
559static int
560key_shutdown(struct socket *so)
561{
562 int s, error;
563 s = splnet();
564 error = raw_usrreqs.pru_shutdown(so);
565 splx(s);
566 return error;
567}
568
569/*
570 * key_sockaddr()
571 * derived from net/rtsock.c:rts_sockaddr()
572 */
573static int
574key_sockaddr(struct socket *so, struct sockaddr **nam)
575{
576 int s, error;
577 s = splnet();
578 error = raw_usrreqs.pru_sockaddr(so, nam);
579 splx(s);
580 return error;
581}
582
583struct pr_usrreqs key_usrreqs = {
584 key_abort, pru_accept_notsupp, key_attach, key_bind,
585 key_connect,
586 pru_connect2_notsupp, pru_control_notsupp, key_detach,
587 key_disconnect, pru_listen_notsupp, key_peeraddr,
588 pru_rcvd_notsupp,
589 pru_rcvoob_notsupp, key_send, pru_sense_null, key_shutdown,
590 key_sockaddr, sosend, soreceive, sopoll
591};
1c79356b 592
1c79356b
A
593/* sysctl */
594SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
1c79356b
A
595
596/*
597 * Definitions of protocols supported in the KEY domain.
598 */
599
600extern struct domain keydomain;
601
602struct protosw keysw[] = {
603{ SOCK_RAW, &keydomain, PF_KEY_V2, PR_ATOMIC|PR_ADDR,
604 0, key_output, raw_ctlinput, 0,
605 0,
606 raw_init, 0, 0, 0,
607 0, &key_usrreqs
608}
609};
610
611struct domain keydomain =
612 { PF_KEY, "key", key_init, 0, 0,
613 keysw, 0,
614 0,0,
615 sizeof(struct key_cb), 0
616 };
617
618DOMAIN_SET(key);