1 /* $FreeBSD: releng/11.1/sys/netipsec/keysock.c 315514 2017-03-18 22:04:20Z ae $ */
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/lock.h>
43 #include <sys/malloc.h>
44 #include <sys/mbuf.h>
45 #include <sys/mutex.h>
46 #include <sys/priv.h>
47 #include <sys/protosw.h>
48 #include <sys/signalvar.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/sysctl.h>
52 #include <sys/systm.h>
53
54 #include <net/if.h>
55 #include <net/vnet.h>
56 #include <net/raw_cb.h>
57
58 #include <netinet/in.h>
59
60 #include <net/pfkeyv2.h>
61 #include <netipsec/key.h>
62 #include <netipsec/keysock.h>
63 #include <netipsec/key_debug.h>
64 #include <netipsec/ipsec.h>
65
66 #include <machine/stdarg.h>
67
68 struct key_cb {
69 int key_count;
70 int any_count;
71 };
72 static VNET_DEFINE(struct key_cb, key_cb);
73 #define V_key_cb VNET(key_cb)
74
75 static struct sockaddr key_src = { 2, PF_KEY, };
76
77 static int key_sendup0(struct rawcb *, struct mbuf *, int);
78
79 VNET_PCPUSTAT_DEFINE(struct pfkeystat, pfkeystat);
80 VNET_PCPUSTAT_SYSINIT(pfkeystat);
81
82 #ifdef VIMAGE
83 VNET_PCPUSTAT_SYSUNINIT(pfkeystat);
84 #endif /* VIMAGE */
85
86 /*
87 * key_output()
88 */
89 int
90 key_output(struct mbuf *m, struct socket *so, ...)
91 {
92 struct sadb_msg *msg;
93 int len, error = 0;
94
95 if (m == NULL)
96 panic("%s: NULL pointer was passed.\n", __func__);
97
98 PFKEYSTAT_INC(out_total);
99 PFKEYSTAT_ADD(out_bytes, m->m_pkthdr.len);
100
101 len = m->m_pkthdr.len;
102 if (len < sizeof(struct sadb_msg)) {
103 PFKEYSTAT_INC(out_tooshort);
104 error = EINVAL;
105 goto end;
106 }
107
108 if (m->m_len < sizeof(struct sadb_msg)) {
109 if ((m = m_pullup(m, sizeof(struct sadb_msg))) == NULL) {
110 PFKEYSTAT_INC(out_nomem);
111 error = ENOBUFS;
112 goto end;
113 }
114 }
115
116 M_ASSERTPKTHDR(m);
117
118 KEYDBG(KEY_DUMP, kdebug_mbuf(m));
119
120 msg = mtod(m, struct sadb_msg *);
121 PFKEYSTAT_INC(out_msgtype[msg->sadb_msg_type]);
122 if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
123 PFKEYSTAT_INC(out_invlen);
124 error = EINVAL;
125 goto end;
126 }
127
128 error = key_parse(m, so);
129 m = NULL;
130 end:
131 if (m)
132 m_freem(m);
133 return error;
134 }
135
136 /*
137 * send message to the socket.
138 */
139 static int
140 key_sendup0(struct rawcb *rp, struct mbuf *m, int promisc)
141 {
142 int error;
143
144 if (promisc) {
145 struct sadb_msg *pmsg;
146
147 M_PREPEND(m, sizeof(struct sadb_msg), M_NOWAIT);
148 if (m == NULL) {
149 PFKEYSTAT_INC(in_nomem);
150 return (ENOBUFS);
151 }
152 pmsg = mtod(m, struct sadb_msg *);
153 bzero(pmsg, sizeof(*pmsg));
154 pmsg->sadb_msg_version = PF_KEY_V2;
155 pmsg->sadb_msg_type = SADB_X_PROMISC;
156 pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
157 /* pid and seq? */
158
159 PFKEYSTAT_INC(in_msgtype[pmsg->sadb_msg_type]);
160 }
161
162 if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src,
163 m, NULL)) {
164 PFKEYSTAT_INC(in_nomem);
165 m_freem(m);
166 error = ENOBUFS;
167 } else
168 error = 0;
169 sorwakeup(rp->rcb_socket);
170 return error;
171 }
172
173 /* XXX this interface should be obsoleted. */
174 int
175 key_sendup(struct socket *so, struct sadb_msg *msg, u_int len, int target)
176 {
177 struct mbuf *m, *n, *mprev;
178 int tlen;
179
180 /* sanity check */
181 if (so == NULL || msg == NULL)
182 panic("%s: NULL pointer was passed.\n", __func__);
183
184 KEYDBG(KEY_DUMP,
185 printf("%s: \n", __func__);
186 kdebug_sadb(msg));
187
188 /*
189 * we increment statistics here, just in case we have ENOBUFS
190 * in this function.
191 */
192 PFKEYSTAT_INC(in_total);
193 PFKEYSTAT_ADD(in_bytes, len);
194 PFKEYSTAT_INC(in_msgtype[msg->sadb_msg_type]);
195
196 /*
197 * Get mbuf chain whenever possible (not clusters),
198 * to save socket buffer. We'll be generating many SADB_ACQUIRE
199 * messages to listening key sockets. If we simply allocate clusters,
200 * sbappendaddr() will raise ENOBUFS due to too little sbspace().
201 * sbspace() computes # of actual data bytes AND mbuf region.
202 *
203 * TODO: SADB_ACQUIRE filters should be implemented.
204 */
205 tlen = len;
206 m = mprev = NULL;
207 while (tlen > 0) {
208 if (tlen == len) {
209 MGETHDR(n, M_NOWAIT, MT_DATA);
210 if (n == NULL) {
211 PFKEYSTAT_INC(in_nomem);
212 return ENOBUFS;
213 }
214 n->m_len = MHLEN;
215 } else {
216 MGET(n, M_NOWAIT, MT_DATA);
217 if (n == NULL) {
218 PFKEYSTAT_INC(in_nomem);
219 return ENOBUFS;
220 }
221 n->m_len = MLEN;
222 }
223 if (tlen >= MCLBYTES) { /*XXX better threshold? */
224 if (!(MCLGET(n, M_NOWAIT))) {
225 m_free(n);
226 m_freem(m);
227 PFKEYSTAT_INC(in_nomem);
228 return ENOBUFS;
229 }
230 n->m_len = MCLBYTES;
231 }
232
233 if (tlen < n->m_len)
234 n->m_len = tlen;
235 n->m_next = NULL;
236 if (m == NULL)
237 m = mprev = n;
238 else {
239 mprev->m_next = n;
240 mprev = n;
241 }
242 tlen -= n->m_len;
243 n = NULL;
244 }
245 m->m_pkthdr.len = len;
246 m->m_pkthdr.rcvif = NULL;
247 m_copyback(m, 0, len, (caddr_t)msg);
248
249 /* avoid duplicated statistics */
250 PFKEYSTAT_ADD(in_total, -1);
251 PFKEYSTAT_ADD(in_bytes, -len);
252 PFKEYSTAT_ADD(in_msgtype[msg->sadb_msg_type], -1);
253
254 return key_sendup_mbuf(so, m, target);
255 }
256
257 /* so can be NULL if target != KEY_SENDUP_ONE */
258 int
259 key_sendup_mbuf(struct socket *so, struct mbuf *m, int target)
260 {
261 struct mbuf *n;
262 struct keycb *kp;
263 int sendup;
264 struct rawcb *rp;
265 int error = 0;
266
267 if (m == NULL)
268 panic("key_sendup_mbuf: NULL pointer was passed.\n");
269 if (so == NULL && target == KEY_SENDUP_ONE)
270 panic("%s: NULL pointer was passed.\n", __func__);
271
272 PFKEYSTAT_INC(in_total);
273 PFKEYSTAT_ADD(in_bytes, m->m_pkthdr.len);
274 if (m->m_len < sizeof(struct sadb_msg)) {
275 m = m_pullup(m, sizeof(struct sadb_msg));
276 if (m == NULL) {
277 PFKEYSTAT_INC(in_nomem);
278 return ENOBUFS;
279 }
280 }
281 if (m->m_len >= sizeof(struct sadb_msg)) {
282 struct sadb_msg *msg;
283 msg = mtod(m, struct sadb_msg *);
284 PFKEYSTAT_INC(in_msgtype[msg->sadb_msg_type]);
285 }
286 mtx_lock(&rawcb_mtx);
287 LIST_FOREACH(rp, &V_rawcb_list, list)
288 {
289 if (rp->rcb_proto.sp_family != PF_KEY)
290 continue;
291 if (rp->rcb_proto.sp_protocol
292 && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
293 continue;
294 }
295
296 kp = (struct keycb *)rp;
297
298 /*
299 * If you are in promiscuous mode, and when you get broadcasted
300 * reply, you'll get two PF_KEY messages.
301 * (based on pf_key@inner.net message on 14 Oct 1998)
302 */
303 if (((struct keycb *)rp)->kp_promisc) {
304 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
305 (void)key_sendup0(rp, n, 1);
306 n = NULL;
307 }
308 }
309
310 /* the exact target will be processed later */
311 if (so && sotorawcb(so) == rp)
312 continue;
313
314 sendup = 0;
315 switch (target) {
316 case KEY_SENDUP_ONE:
317 /* the statement has no effect */
318 if (so && sotorawcb(so) == rp)
319 sendup++;
320 break;
321 case KEY_SENDUP_ALL:
322 sendup++;
323 break;
324 case KEY_SENDUP_REGISTERED:
325 if (kp->kp_registered)
326 sendup++;
327 break;
328 }
329 PFKEYSTAT_INC(in_msgtarget[target]);
330
331 if (!sendup)
332 continue;
333
334 if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) {
335 m_freem(m);
336 PFKEYSTAT_INC(in_nomem);
337 mtx_unlock(&rawcb_mtx);
338 return ENOBUFS;
339 }
340
341 if ((error = key_sendup0(rp, n, 0)) != 0) {
342 m_freem(m);
343 mtx_unlock(&rawcb_mtx);
344 return error;
345 }
346
347 n = NULL;
348 }
349
350 if (so) {
351 error = key_sendup0(sotorawcb(so), m, 0);
352 m = NULL;
353 } else {
354 error = 0;
355 m_freem(m);
356 }
357 mtx_unlock(&rawcb_mtx);
358 return error;
359 }
360
361 /*
362 * key_abort()
363 * derived from net/rtsock.c:rts_abort()
364 */
365 static void
366 key_abort(struct socket *so)
367 {
368 raw_usrreqs.pru_abort(so);
369 }
370
371 /*
372 * key_attach()
373 * derived from net/rtsock.c:rts_attach()
374 */
375 static int
376 key_attach(struct socket *so, int proto, struct thread *td)
377 {
378 struct keycb *kp;
379 int error;
380
381 KASSERT(so->so_pcb == NULL, ("key_attach: so_pcb != NULL"));
382
383 if (td != NULL) {
384 error = priv_check(td, PRIV_NET_RAW);
385 if (error)
386 return error;
387 }
388
389 /* XXX */
390 kp = malloc(sizeof *kp, M_PCB, M_WAITOK | M_ZERO);
391 if (kp == NULL)
392 return ENOBUFS;
393
394 so->so_pcb = (caddr_t)kp;
395 error = raw_attach(so, proto);
396 kp = (struct keycb *)sotorawcb(so);
397 if (error) {
398 free(kp, M_PCB);
399 so->so_pcb = (caddr_t) 0;
400 return error;
401 }
402
403 kp->kp_promisc = kp->kp_registered = 0;
404
405 if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
406 V_key_cb.key_count++;
407 V_key_cb.any_count++;
408 soisconnected(so);
409 so->so_options |= SO_USELOOPBACK;
410
411 return 0;
412 }
413
414 /*
415 * key_bind()
416 * derived from net/rtsock.c:rts_bind()
417 */
418 static int
419 key_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
420 {
421 return EINVAL;
422 }
423
424 /*
425 * key_close()
426 * derived from net/rtsock.c:rts_close().
427 */
428 static void
429 key_close(struct socket *so)
430 {
431
432 raw_usrreqs.pru_close(so);
433 }
434
435 /*
436 * key_connect()
437 * derived from net/rtsock.c:rts_connect()
438 */
439 static int
440 key_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
441 {
442 return EINVAL;
443 }
444
445 /*
446 * key_detach()
447 * derived from net/rtsock.c:rts_detach()
448 */
449 static void
450 key_detach(struct socket *so)
451 {
452 struct keycb *kp = (struct keycb *)sotorawcb(so);
453
454 KASSERT(kp != NULL, ("key_detach: kp == NULL"));
455 if (kp->kp_raw.rcb_proto.sp_protocol
456 == PF_KEY) /* XXX: AF_KEY */
457 V_key_cb.key_count--;
458 V_key_cb.any_count--;
459
460 key_freereg(so);
461 raw_usrreqs.pru_detach(so);
462 }
463
464 /*
465 * key_disconnect()
466 * derived from net/rtsock.c:key_disconnect()
467 */
468 static int
469 key_disconnect(struct socket *so)
470 {
471 return(raw_usrreqs.pru_disconnect(so));
472 }
473
474 /*
475 * key_peeraddr()
476 * derived from net/rtsock.c:rts_peeraddr()
477 */
478 static int
479 key_peeraddr(struct socket *so, struct sockaddr **nam)
480 {
481 return(raw_usrreqs.pru_peeraddr(so, nam));
482 }
483
484 /*
485 * key_send()
486 * derived from net/rtsock.c:rts_send()
487 */
488 static int
489 key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
490 struct mbuf *control, struct thread *td)
491 {
492 return(raw_usrreqs.pru_send(so, flags, m, nam, control, td));
493 }
494
495 /*
496 * key_shutdown()
497 * derived from net/rtsock.c:rts_shutdown()
498 */
499 static int
500 key_shutdown(struct socket *so)
501 {
502 return(raw_usrreqs.pru_shutdown(so));
503 }
504
505 /*
506 * key_sockaddr()
507 * derived from net/rtsock.c:rts_sockaddr()
508 */
509 static int
510 key_sockaddr(struct socket *so, struct sockaddr **nam)
511 {
512 return(raw_usrreqs.pru_sockaddr(so, nam));
513 }
514
515 struct pr_usrreqs key_usrreqs = {
516 .pru_abort = key_abort,
517 .pru_attach = key_attach,
518 .pru_bind = key_bind,
519 .pru_connect = key_connect,
520 .pru_detach = key_detach,
521 .pru_disconnect = key_disconnect,
522 .pru_peeraddr = key_peeraddr,
523 .pru_send = key_send,
524 .pru_shutdown = key_shutdown,
525 .pru_sockaddr = key_sockaddr,
526 .pru_close = key_close,
527 };
528
529 /* sysctl */
530 SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
531
532 /*
533 * Definitions of protocols supported in the KEY domain.
534 */
535
536 extern struct domain keydomain;
537
538 struct protosw keysw[] = {
539 {
540 .pr_type = SOCK_RAW,
541 .pr_domain = &keydomain,
542 .pr_protocol = PF_KEY_V2,
543 .pr_flags = PR_ATOMIC|PR_ADDR,
544 .pr_output = key_output,
545 .pr_ctlinput = raw_ctlinput,
546 .pr_init = raw_init,
547 .pr_usrreqs = &key_usrreqs
548 }
549 };
550
551 static void
552 key_init0(void)
553 {
554
555 bzero((caddr_t)&V_key_cb, sizeof(V_key_cb));
556 key_init();
557 }
558
559 struct domain keydomain = {
560 .dom_family = PF_KEY,
561 .dom_name = "key",
562 .dom_init = key_init0,
563 #ifdef VIMAGE
564 .dom_destroy = key_destroy,
565 #endif
566 .dom_protosw = keysw,
567 .dom_protoswNPROTOSW = &keysw[nitems(keysw)]
568 };
569
570 VNET_DOMAIN_SET(key);
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