1 /* $FreeBSD: releng/5.1/sys/netipsec/keysock.c 113255 2003-04-08 14:25:47Z des $ */
2 /* $KAME: keysock.c,v 1.25 2001/08/13 20:07:41 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include "opt_ipsec.h"
34
35 /* This code has derived from sys/net/rtsock.c on FreeBSD2.2.5 */
36
37 #include <sys/types.h>
38 #include <sys/param.h>
39 #include <sys/domain.h>
40 #include <sys/errno.h>
41 #include <sys/kernel.h>
42 #include <sys/malloc.h>
43 #include <sys/mbuf.h>
44 #include <sys/protosw.h>
45 #include <sys/signalvar.h>
46 #include <sys/socket.h>
47 #include <sys/socketvar.h>
48 #include <sys/sysctl.h>
49 #include <sys/systm.h>
50
51 #include <net/raw_cb.h>
52 #include <net/route.h>
53
54 #include <net/pfkeyv2.h>
55 #include <netipsec/key.h>
56 #include <netipsec/keysock.h>
57 #include <netipsec/key_debug.h>
58
59 #include <machine/stdarg.h>
60
61 struct key_cb {
62 int key_count;
63 int any_count;
64 };
65 static struct key_cb key_cb;
66
67 static struct sockaddr key_dst = { 2, PF_KEY, };
68 static struct sockaddr key_src = { 2, PF_KEY, };
69
70 static int key_sendup0 __P((struct rawcb *, struct mbuf *, int));
71
72 struct pfkeystat pfkeystat;
73
74 /*
75 * key_output()
76 */
77 int
78 #if __STDC__
79 key_output(struct mbuf *m, ...)
80 #else
81 key_output(m, va_alist)
82 struct mbuf *m;
83 va_dcl
84 #endif
85 {
86 struct sadb_msg *msg;
87 int len, error = 0;
88 int s;
89 struct socket *so;
90 va_list ap;
91
92 va_start(ap, m);
93 so = va_arg(ap, struct socket *);
94 va_end(ap);
95
96 if (m == 0)
97 panic("key_output: NULL pointer was passed.\n");
98
99 pfkeystat.out_total++;
100 pfkeystat.out_bytes += m->m_pkthdr.len;
101
102 len = m->m_pkthdr.len;
103 if (len < sizeof(struct sadb_msg)) {
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 pfkeystat.out_nomem++;
112 error = ENOBUFS;
113 goto end;
114 }
115 }
116
117 M_ASSERTPKTHDR(m);
118
119 KEYDEBUG(KEYDEBUG_KEY_DUMP, kdebug_mbuf(m));
120
121 msg = mtod(m, struct sadb_msg *);
122 pfkeystat.out_msgtype[msg->sadb_msg_type]++;
123 if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
124 pfkeystat.out_invlen++;
125 error = EINVAL;
126 goto end;
127 }
128
129 /*XXX giant lock*/
130 s = splnet();
131 error = key_parse(m, so);
132 m = NULL;
133 splx(s);
134 end:
135 if (m)
136 m_freem(m);
137 return error;
138 }
139
140 /*
141 * send message to the socket.
142 */
143 static int
144 key_sendup0(rp, m, promisc)
145 struct rawcb *rp;
146 struct mbuf *m;
147 int promisc;
148 {
149 int error;
150
151 if (promisc) {
152 struct sadb_msg *pmsg;
153
154 M_PREPEND(m, sizeof(struct sadb_msg), M_DONTWAIT);
155 if (m && m->m_len < sizeof(struct sadb_msg))
156 m = m_pullup(m, sizeof(struct sadb_msg));
157 if (!m) {
158 pfkeystat.in_nomem++;
159 m_freem(m);
160 return ENOBUFS;
161 }
162 m->m_pkthdr.len += sizeof(*pmsg);
163
164 pmsg = mtod(m, struct sadb_msg *);
165 bzero(pmsg, sizeof(*pmsg));
166 pmsg->sadb_msg_version = PF_KEY_V2;
167 pmsg->sadb_msg_type = SADB_X_PROMISC;
168 pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
169 /* pid and seq? */
170
171 pfkeystat.in_msgtype[pmsg->sadb_msg_type]++;
172 }
173
174 if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src,
175 m, NULL)) {
176 pfkeystat.in_nomem++;
177 m_freem(m);
178 error = ENOBUFS;
179 } else
180 error = 0;
181 sorwakeup(rp->rcb_socket);
182 return error;
183 }
184
185 /* XXX this interface should be obsoleted. */
186 int
187 key_sendup(so, msg, len, target)
188 struct socket *so;
189 struct sadb_msg *msg;
190 u_int len;
191 int target; /*target of the resulting message*/
192 {
193 struct mbuf *m, *n, *mprev;
194 int tlen;
195
196 /* sanity check */
197 if (so == 0 || msg == 0)
198 panic("key_sendup: NULL pointer was passed.\n");
199
200 KEYDEBUG(KEYDEBUG_KEY_DUMP,
201 printf("key_sendup: \n");
202 kdebug_sadb(msg));
203
204 /*
205 * we increment statistics here, just in case we have ENOBUFS
206 * in this function.
207 */
208 pfkeystat.in_total++;
209 pfkeystat.in_bytes += len;
210 pfkeystat.in_msgtype[msg->sadb_msg_type]++;
211
212 /*
213 * Get mbuf chain whenever possible (not clusters),
214 * to save socket buffer. We'll be generating many SADB_ACQUIRE
215 * messages to listening key sockets. If we simply allocate clusters,
216 * sbappendaddr() will raise ENOBUFS due to too little sbspace().
217 * sbspace() computes # of actual data bytes AND mbuf region.
218 *
219 * TODO: SADB_ACQUIRE filters should be implemented.
220 */
221 tlen = len;
222 m = mprev = NULL;
223 while (tlen > 0) {
224 if (tlen == len) {
225 MGETHDR(n, M_DONTWAIT, MT_DATA);
226 n->m_len = MHLEN;
227 } else {
228 MGET(n, M_DONTWAIT, MT_DATA);
229 n->m_len = MLEN;
230 }
231 if (!n) {
232 pfkeystat.in_nomem++;
233 return ENOBUFS;
234 }
235 if (tlen >= MCLBYTES) { /*XXX better threshold? */
236 MCLGET(n, M_DONTWAIT);
237 if ((n->m_flags & M_EXT) == 0) {
238 m_free(n);
239 m_freem(m);
240 pfkeystat.in_nomem++;
241 return ENOBUFS;
242 }
243 n->m_len = MCLBYTES;
244 }
245
246 if (tlen < n->m_len)
247 n->m_len = tlen;
248 n->m_next = NULL;
249 if (m == NULL)
250 m = mprev = n;
251 else {
252 mprev->m_next = n;
253 mprev = n;
254 }
255 tlen -= n->m_len;
256 n = NULL;
257 }
258 m->m_pkthdr.len = len;
259 m->m_pkthdr.rcvif = NULL;
260 m_copyback(m, 0, len, (caddr_t)msg);
261
262 /* avoid duplicated statistics */
263 pfkeystat.in_total--;
264 pfkeystat.in_bytes -= len;
265 pfkeystat.in_msgtype[msg->sadb_msg_type]--;
266
267 return key_sendup_mbuf(so, m, target);
268 }
269
270 /* so can be NULL if target != KEY_SENDUP_ONE */
271 int
272 key_sendup_mbuf(so, m, target)
273 struct socket *so;
274 struct mbuf *m;
275 int target;
276 {
277 struct mbuf *n;
278 struct keycb *kp;
279 int sendup;
280 struct rawcb *rp;
281 int error = 0;
282
283 if (m == NULL)
284 panic("key_sendup_mbuf: NULL pointer was passed.\n");
285 if (so == NULL && target == KEY_SENDUP_ONE)
286 panic("key_sendup_mbuf: NULL pointer was passed.\n");
287
288 pfkeystat.in_total++;
289 pfkeystat.in_bytes += m->m_pkthdr.len;
290 if (m->m_len < sizeof(struct sadb_msg)) {
291 #if 1
292 m = m_pullup(m, sizeof(struct sadb_msg));
293 if (m == NULL) {
294 pfkeystat.in_nomem++;
295 return ENOBUFS;
296 }
297 #else
298 /* don't bother pulling it up just for stats */
299 #endif
300 }
301 if (m->m_len >= sizeof(struct sadb_msg)) {
302 struct sadb_msg *msg;
303 msg = mtod(m, struct sadb_msg *);
304 pfkeystat.in_msgtype[msg->sadb_msg_type]++;
305 }
306
307 LIST_FOREACH(rp, &rawcb_list, list)
308 {
309 if (rp->rcb_proto.sp_family != PF_KEY)
310 continue;
311 if (rp->rcb_proto.sp_protocol
312 && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
313 continue;
314 }
315
316 kp = (struct keycb *)rp;
317
318 /*
319 * If you are in promiscuous mode, and when you get broadcasted
320 * reply, you'll get two PF_KEY messages.
321 * (based on pf_key@inner.net message on 14 Oct 1998)
322 */
323 if (((struct keycb *)rp)->kp_promisc) {
324 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
325 (void)key_sendup0(rp, n, 1);
326 n = NULL;
327 }
328 }
329
330 /* the exact target will be processed later */
331 if (so && sotorawcb(so) == rp)
332 continue;
333
334 sendup = 0;
335 switch (target) {
336 case KEY_SENDUP_ONE:
337 /* the statement has no effect */
338 if (so && sotorawcb(so) == rp)
339 sendup++;
340 break;
341 case KEY_SENDUP_ALL:
342 sendup++;
343 break;
344 case KEY_SENDUP_REGISTERED:
345 if (kp->kp_registered)
346 sendup++;
347 break;
348 }
349 pfkeystat.in_msgtarget[target]++;
350
351 if (!sendup)
352 continue;
353
354 if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) {
355 m_freem(m);
356 pfkeystat.in_nomem++;
357 return ENOBUFS;
358 }
359
360 if ((error = key_sendup0(rp, n, 0)) != 0) {
361 m_freem(m);
362 return error;
363 }
364
365 n = NULL;
366 }
367
368 if (so) {
369 error = key_sendup0(sotorawcb(so), m, 0);
370 m = NULL;
371 } else {
372 error = 0;
373 m_freem(m);
374 }
375 return error;
376 }
377
378 /*
379 * key_abort()
380 * derived from net/rtsock.c:rts_abort()
381 */
382 static int
383 key_abort(struct socket *so)
384 {
385 int s, error;
386 s = splnet();
387 error = raw_usrreqs.pru_abort(so);
388 splx(s);
389 return error;
390 }
391
392 /*
393 * key_attach()
394 * derived from net/rtsock.c:rts_attach()
395 */
396 static int
397 key_attach(struct socket *so, int proto, struct thread *td)
398 {
399 struct keycb *kp;
400 int s, error;
401
402 if (sotorawcb(so) != 0)
403 return EISCONN; /* XXX panic? */
404 kp = (struct keycb *)malloc(sizeof *kp, M_PCB, M_WAITOK|M_ZERO); /* XXX */
405 if (kp == 0)
406 return ENOBUFS;
407
408 /*
409 * The splnet() is necessary to block protocols from sending
410 * error notifications (like RTM_REDIRECT or RTM_LOSING) while
411 * this PCB is extant but incompletely initialized.
412 * Probably we should try to do more of this work beforehand and
413 * eliminate the spl.
414 */
415 s = splnet();
416 so->so_pcb = (caddr_t)kp;
417 error = raw_usrreqs.pru_attach(so, proto, td);
418 kp = (struct keycb *)sotorawcb(so);
419 if (error) {
420 free(kp, M_PCB);
421 so->so_pcb = (caddr_t) 0;
422 splx(s);
423 return error;
424 }
425
426 kp->kp_promisc = kp->kp_registered = 0;
427
428 if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
429 key_cb.key_count++;
430 key_cb.any_count++;
431 kp->kp_raw.rcb_laddr = &key_src;
432 kp->kp_raw.rcb_faddr = &key_dst;
433 soisconnected(so);
434 so->so_options |= SO_USELOOPBACK;
435
436 splx(s);
437 return 0;
438 }
439
440 /*
441 * key_bind()
442 * derived from net/rtsock.c:rts_bind()
443 */
444 static int
445 key_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
446 {
447 int s, error;
448 s = splnet();
449 error = raw_usrreqs.pru_bind(so, nam, td); /* xxx just EINVAL */
450 splx(s);
451 return error;
452 }
453
454 /*
455 * key_connect()
456 * derived from net/rtsock.c:rts_connect()
457 */
458 static int
459 key_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
460 {
461 int s, error;
462 s = splnet();
463 error = raw_usrreqs.pru_connect(so, nam, td); /* XXX just EINVAL */
464 splx(s);
465 return error;
466 }
467
468 /*
469 * key_detach()
470 * derived from net/rtsock.c:rts_detach()
471 */
472 static int
473 key_detach(struct socket *so)
474 {
475 struct keycb *kp = (struct keycb *)sotorawcb(so);
476 int s, error;
477
478 s = splnet();
479 if (kp != 0) {
480 if (kp->kp_raw.rcb_proto.sp_protocol
481 == PF_KEY) /* XXX: AF_KEY */
482 key_cb.key_count--;
483 key_cb.any_count--;
484
485 key_freereg(so);
486 }
487 error = raw_usrreqs.pru_detach(so);
488 splx(s);
489 return error;
490 }
491
492 /*
493 * key_disconnect()
494 * derived from net/rtsock.c:key_disconnect()
495 */
496 static int
497 key_disconnect(struct socket *so)
498 {
499 int s, error;
500 s = splnet();
501 error = raw_usrreqs.pru_disconnect(so);
502 splx(s);
503 return error;
504 }
505
506 /*
507 * key_peeraddr()
508 * derived from net/rtsock.c:rts_peeraddr()
509 */
510 static int
511 key_peeraddr(struct socket *so, struct sockaddr **nam)
512 {
513 int s, error;
514 s = splnet();
515 error = raw_usrreqs.pru_peeraddr(so, nam);
516 splx(s);
517 return error;
518 }
519
520 /*
521 * key_send()
522 * derived from net/rtsock.c:rts_send()
523 */
524 static int
525 key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
526 struct mbuf *control, struct thread *td)
527 {
528 int s, error;
529 s = splnet();
530 error = raw_usrreqs.pru_send(so, flags, m, nam, control, td);
531 splx(s);
532 return error;
533 }
534
535 /*
536 * key_shutdown()
537 * derived from net/rtsock.c:rts_shutdown()
538 */
539 static int
540 key_shutdown(struct socket *so)
541 {
542 int s, error;
543 s = splnet();
544 error = raw_usrreqs.pru_shutdown(so);
545 splx(s);
546 return error;
547 }
548
549 /*
550 * key_sockaddr()
551 * derived from net/rtsock.c:rts_sockaddr()
552 */
553 static int
554 key_sockaddr(struct socket *so, struct sockaddr **nam)
555 {
556 int s, error;
557 s = splnet();
558 error = raw_usrreqs.pru_sockaddr(so, nam);
559 splx(s);
560 return error;
561 }
562
563 struct pr_usrreqs key_usrreqs = {
564 key_abort, pru_accept_notsupp, key_attach, key_bind,
565 key_connect,
566 pru_connect2_notsupp, pru_control_notsupp, key_detach,
567 key_disconnect, pru_listen_notsupp, key_peeraddr,
568 pru_rcvd_notsupp,
569 pru_rcvoob_notsupp, key_send, pru_sense_null, key_shutdown,
570 key_sockaddr, sosend, soreceive, sopoll
571 };
572
573 /* sysctl */
574 SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
575
576 /*
577 * Definitions of protocols supported in the KEY domain.
578 */
579
580 extern struct domain keydomain;
581
582 struct protosw keysw[] = {
583 { SOCK_RAW, &keydomain, PF_KEY_V2, PR_ATOMIC|PR_ADDR,
584 0, (pr_output_t *)key_output, raw_ctlinput, 0,
585 0,
586 raw_init, 0, 0, 0,
587 &key_usrreqs
588 }
589 };
590
591 static void
592 key_init0(void)
593 {
594 bzero((caddr_t)&key_cb, sizeof(key_cb));
595 key_init();
596 }
597
598 struct domain keydomain =
599 { PF_KEY, "key", key_init0, 0, 0,
600 keysw, &keysw[sizeof(keysw)/sizeof(keysw[0])] };
601
602 DOMAIN_SET(key);
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