1 /* $FreeBSD$ */
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 typedef int pr_output_t (struct mbuf *, struct socket *);
62
63 struct key_cb {
64 int key_count;
65 int any_count;
66 };
67 static struct key_cb key_cb;
68
69 static struct sockaddr key_dst = { 2, PF_KEY, };
70 static struct sockaddr key_src = { 2, PF_KEY, };
71
72 static int key_sendup0 __P((struct rawcb *, struct mbuf *, int));
73
74 struct pfkeystat pfkeystat;
75
76 /*
77 * key_output()
78 */
79 int
80 #if __STDC__
81 key_output(struct mbuf *m, ...)
82 #else
83 key_output(m, va_alist)
84 struct mbuf *m;
85 va_dcl
86 #endif
87 {
88 struct sadb_msg *msg;
89 int len, error = 0;
90 int s;
91 struct socket *so;
92 va_list ap;
93
94 va_start(ap, m);
95 so = va_arg(ap, struct socket *);
96 va_end(ap);
97
98 if (m == 0)
99 panic("key_output: NULL pointer was passed.\n");
100
101 pfkeystat.out_total++;
102 pfkeystat.out_bytes += m->m_pkthdr.len;
103
104 len = m->m_pkthdr.len;
105 if (len < sizeof(struct sadb_msg)) {
106 pfkeystat.out_tooshort++;
107 error = EINVAL;
108 goto end;
109 }
110
111 if (m->m_len < sizeof(struct sadb_msg)) {
112 if ((m = m_pullup(m, sizeof(struct sadb_msg))) == 0) {
113 pfkeystat.out_nomem++;
114 error = ENOBUFS;
115 goto end;
116 }
117 }
118
119 if ((m->m_flags & M_PKTHDR) == 0)
120 panic("key_output: not M_PKTHDR ??");
121
122 KEYDEBUG(KEYDEBUG_KEY_DUMP, kdebug_mbuf(m));
123
124 msg = mtod(m, struct sadb_msg *);
125 pfkeystat.out_msgtype[msg->sadb_msg_type]++;
126 if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
127 pfkeystat.out_invlen++;
128 error = EINVAL;
129 goto end;
130 }
131
132 /*XXX giant lock*/
133 s = splnet();
134 error = key_parse(m, so);
135 m = NULL;
136 splx(s);
137 end:
138 if (m)
139 m_freem(m);
140 return error;
141 }
142
143 /*
144 * send message to the socket.
145 */
146 static int
147 key_sendup0(rp, m, promisc)
148 struct rawcb *rp;
149 struct mbuf *m;
150 int promisc;
151 {
152 int error;
153
154 if (promisc) {
155 struct sadb_msg *pmsg;
156
157 M_PREPEND(m, sizeof(struct sadb_msg), M_DONTWAIT);
158 if (m && m->m_len < sizeof(struct sadb_msg))
159 m = m_pullup(m, sizeof(struct sadb_msg));
160 if (!m) {
161 pfkeystat.in_nomem++;
162 m_freem(m);
163 return ENOBUFS;
164 }
165 m->m_pkthdr.len += sizeof(*pmsg);
166
167 pmsg = mtod(m, struct sadb_msg *);
168 bzero(pmsg, sizeof(*pmsg));
169 pmsg->sadb_msg_version = PF_KEY_V2;
170 pmsg->sadb_msg_type = SADB_X_PROMISC;
171 pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
172 /* pid and seq? */
173
174 pfkeystat.in_msgtype[pmsg->sadb_msg_type]++;
175 }
176
177 if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src,
178 m, NULL)) {
179 pfkeystat.in_nomem++;
180 m_freem(m);
181 error = ENOBUFS;
182 } else
183 error = 0;
184 sorwakeup(rp->rcb_socket);
185 return error;
186 }
187
188 /* XXX this interface should be obsoleted. */
189 int
190 key_sendup(so, msg, len, target)
191 struct socket *so;
192 struct sadb_msg *msg;
193 u_int len;
194 int target; /*target of the resulting message*/
195 {
196 struct mbuf *m, *n, *mprev;
197 int tlen;
198
199 /* sanity check */
200 if (so == 0 || msg == 0)
201 panic("key_sendup: NULL pointer was passed.\n");
202
203 KEYDEBUG(KEYDEBUG_KEY_DUMP,
204 printf("key_sendup: \n");
205 kdebug_sadb(msg));
206
207 /*
208 * we increment statistics here, just in case we have ENOBUFS
209 * in this function.
210 */
211 pfkeystat.in_total++;
212 pfkeystat.in_bytes += len;
213 pfkeystat.in_msgtype[msg->sadb_msg_type]++;
214
215 /*
216 * Get mbuf chain whenever possible (not clusters),
217 * to save socket buffer. We'll be generating many SADB_ACQUIRE
218 * messages to listening key sockets. If we simply allocate clusters,
219 * sbappendaddr() will raise ENOBUFS due to too little sbspace().
220 * sbspace() computes # of actual data bytes AND mbuf region.
221 *
222 * TODO: SADB_ACQUIRE filters should be implemented.
223 */
224 tlen = len;
225 m = mprev = NULL;
226 while (tlen > 0) {
227 if (tlen == len) {
228 MGETHDR(n, M_DONTWAIT, MT_DATA);
229 n->m_len = MHLEN;
230 } else {
231 MGET(n, M_DONTWAIT, MT_DATA);
232 n->m_len = MLEN;
233 }
234 if (!n) {
235 pfkeystat.in_nomem++;
236 return ENOBUFS;
237 }
238 if (tlen >= MCLBYTES) { /*XXX better threshold? */
239 MCLGET(n, M_DONTWAIT);
240 if ((n->m_flags & M_EXT) == 0) {
241 m_free(n);
242 m_freem(m);
243 pfkeystat.in_nomem++;
244 return ENOBUFS;
245 }
246 n->m_len = MCLBYTES;
247 }
248
249 if (tlen < n->m_len)
250 n->m_len = tlen;
251 n->m_next = NULL;
252 if (m == NULL)
253 m = mprev = n;
254 else {
255 mprev->m_next = n;
256 mprev = n;
257 }
258 tlen -= n->m_len;
259 n = NULL;
260 }
261 m->m_pkthdr.len = len;
262 m->m_pkthdr.rcvif = NULL;
263 m_copyback(m, 0, len, (caddr_t)msg);
264
265 /* avoid duplicated statistics */
266 pfkeystat.in_total--;
267 pfkeystat.in_bytes -= len;
268 pfkeystat.in_msgtype[msg->sadb_msg_type]--;
269
270 return key_sendup_mbuf(so, m, target);
271 }
272
273 /* so can be NULL if target != KEY_SENDUP_ONE */
274 int
275 key_sendup_mbuf(so, m, target)
276 struct socket *so;
277 struct mbuf *m;
278 int target;
279 {
280 struct mbuf *n;
281 struct keycb *kp;
282 int sendup;
283 struct rawcb *rp;
284 int error = 0;
285
286 if (m == NULL)
287 panic("key_sendup_mbuf: NULL pointer was passed.\n");
288 if (so == NULL && target == KEY_SENDUP_ONE)
289 panic("key_sendup_mbuf: NULL pointer was passed.\n");
290
291 pfkeystat.in_total++;
292 pfkeystat.in_bytes += m->m_pkthdr.len;
293 if (m->m_len < sizeof(struct sadb_msg)) {
294 #if 1
295 m = m_pullup(m, sizeof(struct sadb_msg));
296 if (m == NULL) {
297 pfkeystat.in_nomem++;
298 return ENOBUFS;
299 }
300 #else
301 /* don't bother pulling it up just for stats */
302 #endif
303 }
304 if (m->m_len >= sizeof(struct sadb_msg)) {
305 struct sadb_msg *msg;
306 msg = mtod(m, struct sadb_msg *);
307 pfkeystat.in_msgtype[msg->sadb_msg_type]++;
308 }
309
310 LIST_FOREACH(rp, &rawcb_list, list)
311 {
312 if (rp->rcb_proto.sp_family != PF_KEY)
313 continue;
314 if (rp->rcb_proto.sp_protocol
315 && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
316 continue;
317 }
318
319 kp = (struct keycb *)rp;
320
321 /*
322 * If you are in promiscuous mode, and when you get broadcasted
323 * reply, you'll get two PF_KEY messages.
324 * (based on pf_key@inner.net message on 14 Oct 1998)
325 */
326 if (((struct keycb *)rp)->kp_promisc) {
327 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
328 (void)key_sendup0(rp, n, 1);
329 n = NULL;
330 }
331 }
332
333 /* the exact target will be processed later */
334 if (so && sotorawcb(so) == rp)
335 continue;
336
337 sendup = 0;
338 switch (target) {
339 case KEY_SENDUP_ONE:
340 /* the statement has no effect */
341 if (so && sotorawcb(so) == rp)
342 sendup++;
343 break;
344 case KEY_SENDUP_ALL:
345 sendup++;
346 break;
347 case KEY_SENDUP_REGISTERED:
348 if (kp->kp_registered)
349 sendup++;
350 break;
351 }
352 pfkeystat.in_msgtarget[target]++;
353
354 if (!sendup)
355 continue;
356
357 if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) {
358 m_freem(m);
359 pfkeystat.in_nomem++;
360 return ENOBUFS;
361 }
362
363 if ((error = key_sendup0(rp, n, 0)) != 0) {
364 m_freem(m);
365 return error;
366 }
367
368 n = NULL;
369 }
370
371 if (so) {
372 error = key_sendup0(sotorawcb(so), m, 0);
373 m = NULL;
374 } else {
375 error = 0;
376 m_freem(m);
377 }
378 return error;
379 }
380
381 /*
382 * key_abort()
383 * derived from net/rtsock.c:rts_abort()
384 */
385 static int
386 key_abort(struct socket *so)
387 {
388 int s, error;
389 s = splnet();
390 error = raw_usrreqs.pru_abort(so);
391 splx(s);
392 return error;
393 }
394
395 /*
396 * key_attach()
397 * derived from net/rtsock.c:rts_attach()
398 */
399 static int
400 key_attach(struct socket *so, int proto, struct proc *td)
401 {
402 struct keycb *kp;
403 int s, error;
404
405 if (sotorawcb(so) != 0)
406 return EISCONN; /* XXX panic? */
407 kp = (struct keycb *)malloc(sizeof *kp, M_PCB, M_WAITOK|M_ZERO); /* XXX */
408 if (kp == 0)
409 return ENOBUFS;
410
411 /*
412 * The splnet() is necessary to block protocols from sending
413 * error notifications (like RTM_REDIRECT or RTM_LOSING) while
414 * this PCB is extant but incompletely initialized.
415 * Probably we should try to do more of this work beforehand and
416 * eliminate the spl.
417 */
418 s = splnet();
419 so->so_pcb = (caddr_t)kp;
420 error = raw_usrreqs.pru_attach(so, proto, td);
421 kp = (struct keycb *)sotorawcb(so);
422 if (error) {
423 free(kp, M_PCB);
424 so->so_pcb = (caddr_t) 0;
425 splx(s);
426 return error;
427 }
428
429 kp->kp_promisc = kp->kp_registered = 0;
430
431 if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
432 key_cb.key_count++;
433 key_cb.any_count++;
434 kp->kp_raw.rcb_laddr = &key_src;
435 kp->kp_raw.rcb_faddr = &key_dst;
436 soisconnected(so);
437 so->so_options |= SO_USELOOPBACK;
438
439 splx(s);
440 return 0;
441 }
442
443 /*
444 * key_bind()
445 * derived from net/rtsock.c:rts_bind()
446 */
447 static int
448 key_bind(struct socket *so, struct sockaddr *nam, struct proc *td)
449 {
450 int s, error;
451 s = splnet();
452 error = raw_usrreqs.pru_bind(so, nam, td); /* xxx just EINVAL */
453 splx(s);
454 return error;
455 }
456
457 /*
458 * key_connect()
459 * derived from net/rtsock.c:rts_connect()
460 */
461 static int
462 key_connect(struct socket *so, struct sockaddr *nam, struct proc *td)
463 {
464 int s, error;
465 s = splnet();
466 error = raw_usrreqs.pru_connect(so, nam, td); /* XXX just EINVAL */
467 splx(s);
468 return error;
469 }
470
471 /*
472 * key_detach()
473 * derived from net/rtsock.c:rts_detach()
474 */
475 static int
476 key_detach(struct socket *so)
477 {
478 struct keycb *kp = (struct keycb *)sotorawcb(so);
479 int s, error;
480
481 s = splnet();
482 if (kp != 0) {
483 if (kp->kp_raw.rcb_proto.sp_protocol
484 == PF_KEY) /* XXX: AF_KEY */
485 key_cb.key_count--;
486 key_cb.any_count--;
487
488 key_freereg(so);
489 }
490 error = raw_usrreqs.pru_detach(so);
491 splx(s);
492 return error;
493 }
494
495 /*
496 * key_disconnect()
497 * derived from net/rtsock.c:key_disconnect()
498 */
499 static int
500 key_disconnect(struct socket *so)
501 {
502 int s, error;
503 s = splnet();
504 error = raw_usrreqs.pru_disconnect(so);
505 splx(s);
506 return error;
507 }
508
509 /*
510 * key_peeraddr()
511 * derived from net/rtsock.c:rts_peeraddr()
512 */
513 static int
514 key_peeraddr(struct socket *so, struct sockaddr **nam)
515 {
516 int s, error;
517 s = splnet();
518 error = raw_usrreqs.pru_peeraddr(so, nam);
519 splx(s);
520 return error;
521 }
522
523 /*
524 * key_send()
525 * derived from net/rtsock.c:rts_send()
526 */
527 static int
528 key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
529 struct mbuf *control, struct proc *td)
530 {
531 int s, error;
532 s = splnet();
533 error = raw_usrreqs.pru_send(so, flags, m, nam, control, td);
534 splx(s);
535 return error;
536 }
537
538 /*
539 * key_shutdown()
540 * derived from net/rtsock.c:rts_shutdown()
541 */
542 static int
543 key_shutdown(struct socket *so)
544 {
545 int s, error;
546 s = splnet();
547 error = raw_usrreqs.pru_shutdown(so);
548 splx(s);
549 return error;
550 }
551
552 /*
553 * key_sockaddr()
554 * derived from net/rtsock.c:rts_sockaddr()
555 */
556 static int
557 key_sockaddr(struct socket *so, struct sockaddr **nam)
558 {
559 int s, error;
560 s = splnet();
561 error = raw_usrreqs.pru_sockaddr(so, nam);
562 splx(s);
563 return error;
564 }
565
566 struct pr_usrreqs key_usrreqs = {
567 key_abort, pru_accept_notsupp, key_attach, key_bind,
568 key_connect,
569 pru_connect2_notsupp, pru_control_notsupp, key_detach,
570 key_disconnect, pru_listen_notsupp, key_peeraddr,
571 pru_rcvd_notsupp,
572 pru_rcvoob_notsupp, key_send, pru_sense_null, key_shutdown,
573 key_sockaddr, sosend, soreceive, sopoll
574 };
575
576 /* sysctl */
577 SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
578
579 /*
580 * Definitions of protocols supported in the KEY domain.
581 */
582
583 extern struct domain keydomain;
584
585 struct protosw keysw[] = {
586 { SOCK_RAW, &keydomain, PF_KEY_V2, PR_ATOMIC|PR_ADDR,
587 0, (pr_output_t *)key_output, raw_ctlinput, 0,
588 0,
589 raw_init, 0, 0, 0,
590 &key_usrreqs
591 }
592 };
593
594 static void
595 key_init0(void)
596 {
597 bzero((caddr_t)&key_cb, sizeof(key_cb));
598 key_init();
599 }
600
601 struct domain keydomain =
602 { PF_KEY, "key", key_init0, 0, 0,
603 keysw, &keysw[sizeof(keysw)/sizeof(keysw[0])] };
604
605 DOMAIN_SET(key);
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