1 /* $FreeBSD$ */
2 /* $KAME: keysock.c,v 1.25 2001/08/13 20:07:41 itojun Exp $ */
3
4 /*-
5 * SPDX-License-Identifier: BSD-3-Clause
6 *
7 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the project nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include "opt_ipsec.h"
36
37 /* This code has derived from sys/net/rtsock.c on FreeBSD2.2.5 */
38
39 #include <sys/types.h>
40 #include <sys/param.h>
41 #include <sys/domain.h>
42 #include <sys/errno.h>
43 #include <sys/kernel.h>
44 #include <sys/lock.h>
45 #include <sys/malloc.h>
46 #include <sys/mbuf.h>
47 #include <sys/mutex.h>
48 #include <sys/priv.h>
49 #include <sys/protosw.h>
50 #include <sys/signalvar.h>
51 #include <sys/socket.h>
52 #include <sys/socketvar.h>
53 #include <sys/sysctl.h>
54 #include <sys/systm.h>
55
56 #include <net/if.h>
57 #include <net/vnet.h>
58 #include <net/raw_cb.h>
59
60 #include <netinet/in.h>
61
62 #include <net/pfkeyv2.h>
63 #include <netipsec/key.h>
64 #include <netipsec/keysock.h>
65 #include <netipsec/key_debug.h>
66 #include <netipsec/ipsec.h>
67
68 #include <machine/stdarg.h>
69
70 struct key_cb {
71 int key_count;
72 int any_count;
73 };
74 VNET_DEFINE_STATIC(struct key_cb, key_cb);
75 #define V_key_cb VNET(key_cb)
76
77 static struct sockaddr key_src = { 2, PF_KEY, };
78
79 static int key_sendup0(struct rawcb *, struct mbuf *, int);
80
81 VNET_PCPUSTAT_DEFINE(struct pfkeystat, pfkeystat);
82 VNET_PCPUSTAT_SYSINIT(pfkeystat);
83
84 #ifdef VIMAGE
85 VNET_PCPUSTAT_SYSUNINIT(pfkeystat);
86 #endif /* VIMAGE */
87
88 /*
89 * key_output()
90 */
91 int
92 key_output(struct mbuf *m, struct socket *so, ...)
93 {
94 struct sadb_msg *msg;
95 int len, error = 0;
96
97 if (m == NULL)
98 panic("%s: NULL pointer was passed.\n", __func__);
99
100 PFKEYSTAT_INC(out_total);
101 PFKEYSTAT_ADD(out_bytes, m->m_pkthdr.len);
102
103 len = m->m_pkthdr.len;
104 if (len < sizeof(struct sadb_msg)) {
105 PFKEYSTAT_INC(out_tooshort);
106 error = EINVAL;
107 goto end;
108 }
109
110 if (m->m_len < sizeof(struct sadb_msg)) {
111 if ((m = m_pullup(m, sizeof(struct sadb_msg))) == NULL) {
112 PFKEYSTAT_INC(out_nomem);
113 error = ENOBUFS;
114 goto end;
115 }
116 }
117
118 M_ASSERTPKTHDR(m);
119
120 KEYDBG(KEY_DUMP, kdebug_mbuf(m));
121
122 msg = mtod(m, struct sadb_msg *);
123 PFKEYSTAT_INC(out_msgtype[msg->sadb_msg_type]);
124 if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) {
125 PFKEYSTAT_INC(out_invlen);
126 error = EINVAL;
127 goto end;
128 }
129
130 error = key_parse(m, so);
131 m = NULL;
132 end:
133 if (m)
134 m_freem(m);
135 return error;
136 }
137
138 /*
139 * send message to the socket.
140 */
141 static int
142 key_sendup0(struct rawcb *rp, struct mbuf *m, int promisc)
143 {
144
145 if (promisc) {
146 struct sadb_msg *pmsg;
147
148 M_PREPEND(m, sizeof(struct sadb_msg), M_NOWAIT);
149 if (m == NULL) {
150 PFKEYSTAT_INC(in_nomem);
151 return (ENOBUFS);
152 }
153 pmsg = mtod(m, struct sadb_msg *);
154 bzero(pmsg, sizeof(*pmsg));
155 pmsg->sadb_msg_version = PF_KEY_V2;
156 pmsg->sadb_msg_type = SADB_X_PROMISC;
157 pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
158 /* pid and seq? */
159
160 PFKEYSTAT_INC(in_msgtype[pmsg->sadb_msg_type]);
161 }
162
163 if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src,
164 m, NULL)) {
165 PFKEYSTAT_INC(in_nomem);
166 m_freem(m);
167 soroverflow(rp->rcb_socket);
168 return ENOBUFS;
169 }
170
171 sorwakeup(rp->rcb_socket);
172 return 0;
173 }
174
175 /* so can be NULL if target != KEY_SENDUP_ONE */
176 int
177 key_sendup_mbuf(struct socket *so, struct mbuf *m, int target)
178 {
179 struct mbuf *n;
180 struct keycb *kp;
181 struct rawcb *rp;
182 int error = 0;
183
184 KASSERT(m != NULL, ("NULL mbuf pointer was passed."));
185 KASSERT(so != NULL || target != KEY_SENDUP_ONE,
186 ("NULL socket pointer was passed."));
187 KASSERT(target == KEY_SENDUP_ONE || target == KEY_SENDUP_ALL ||
188 target == KEY_SENDUP_REGISTERED, ("Wrong target %d", target));
189
190 PFKEYSTAT_INC(in_total);
191 PFKEYSTAT_ADD(in_bytes, m->m_pkthdr.len);
192 if (m->m_len < sizeof(struct sadb_msg)) {
193 m = m_pullup(m, sizeof(struct sadb_msg));
194 if (m == NULL) {
195 PFKEYSTAT_INC(in_nomem);
196 return ENOBUFS;
197 }
198 }
199 if (m->m_len >= sizeof(struct sadb_msg)) {
200 struct sadb_msg *msg;
201 msg = mtod(m, struct sadb_msg *);
202 PFKEYSTAT_INC(in_msgtype[msg->sadb_msg_type]);
203 }
204 mtx_lock(&rawcb_mtx);
205 if (V_key_cb.any_count == 0) {
206 mtx_unlock(&rawcb_mtx);
207 m_freem(m);
208 return (0);
209 }
210 LIST_FOREACH(rp, &V_rawcb_list, list)
211 {
212 if (rp->rcb_proto.sp_family != PF_KEY)
213 continue;
214 if (rp->rcb_proto.sp_protocol
215 && rp->rcb_proto.sp_protocol != PF_KEY_V2) {
216 continue;
217 }
218
219 /*
220 * If you are in promiscuous mode, and when you get broadcasted
221 * reply, you'll get two PF_KEY messages.
222 * (based on pf_key@inner.net message on 14 Oct 1998)
223 */
224 kp = (struct keycb *)rp;
225 if (kp->kp_promisc) {
226 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
227 if (n != NULL)
228 key_sendup0(rp, n, 1);
229 else
230 PFKEYSTAT_INC(in_nomem);
231 }
232
233 /* the exact target will be processed later */
234 if (so && sotorawcb(so) == rp)
235 continue;
236
237 if (target == KEY_SENDUP_ONE || (
238 target == KEY_SENDUP_REGISTERED && kp->kp_registered == 0))
239 continue;
240
241 /* KEY_SENDUP_ALL + KEY_SENDUP_REGISTERED */
242 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
243 if (n == NULL) {
244 PFKEYSTAT_INC(in_nomem);
245 /* Try send to another socket */
246 continue;
247 }
248
249 if (key_sendup0(rp, n, 0) == 0)
250 PFKEYSTAT_INC(in_msgtarget[target]);
251 }
252
253 if (so) { /* KEY_SENDUP_ONE */
254 error = key_sendup0(sotorawcb(so), m, 0);
255 if (error == 0)
256 PFKEYSTAT_INC(in_msgtarget[KEY_SENDUP_ONE]);
257 } else {
258 error = 0;
259 m_freem(m);
260 }
261 mtx_unlock(&rawcb_mtx);
262 return (error);
263 }
264
265 /*
266 * key_abort()
267 * derived from net/rtsock.c:rts_abort()
268 */
269 static void
270 key_abort(struct socket *so)
271 {
272 raw_usrreqs.pru_abort(so);
273 }
274
275 /*
276 * key_attach()
277 * derived from net/rtsock.c:rts_attach()
278 */
279 static int
280 key_attach(struct socket *so, int proto, struct thread *td)
281 {
282 struct keycb *kp;
283 int error;
284
285 KASSERT(so->so_pcb == NULL, ("key_attach: so_pcb != NULL"));
286
287 if (td != NULL) {
288 error = priv_check(td, PRIV_NET_RAW);
289 if (error)
290 return error;
291 }
292
293 /* XXX */
294 kp = malloc(sizeof *kp, M_PCB, M_WAITOK | M_ZERO);
295 if (kp == NULL)
296 return ENOBUFS;
297
298 so->so_pcb = (caddr_t)kp;
299 error = raw_attach(so, proto);
300 kp = (struct keycb *)sotorawcb(so);
301 if (error) {
302 free(kp, M_PCB);
303 so->so_pcb = (caddr_t) 0;
304 return error;
305 }
306
307 kp->kp_promisc = kp->kp_registered = 0;
308
309 if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */
310 V_key_cb.key_count++;
311 V_key_cb.any_count++;
312 soisconnected(so);
313 so->so_options |= SO_USELOOPBACK;
314
315 return 0;
316 }
317
318 /*
319 * key_bind()
320 * derived from net/rtsock.c:rts_bind()
321 */
322 static int
323 key_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
324 {
325 return EINVAL;
326 }
327
328 /*
329 * key_close()
330 * derived from net/rtsock.c:rts_close().
331 */
332 static void
333 key_close(struct socket *so)
334 {
335
336 raw_usrreqs.pru_close(so);
337 }
338
339 /*
340 * key_connect()
341 * derived from net/rtsock.c:rts_connect()
342 */
343 static int
344 key_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
345 {
346 return EINVAL;
347 }
348
349 /*
350 * key_detach()
351 * derived from net/rtsock.c:rts_detach()
352 */
353 static void
354 key_detach(struct socket *so)
355 {
356 struct keycb *kp = (struct keycb *)sotorawcb(so);
357
358 KASSERT(kp != NULL, ("key_detach: kp == NULL"));
359 if (kp->kp_raw.rcb_proto.sp_protocol
360 == PF_KEY) /* XXX: AF_KEY */
361 V_key_cb.key_count--;
362 V_key_cb.any_count--;
363
364 key_freereg(so);
365 raw_usrreqs.pru_detach(so);
366 }
367
368 /*
369 * key_disconnect()
370 * derived from net/rtsock.c:key_disconnect()
371 */
372 static int
373 key_disconnect(struct socket *so)
374 {
375 return(raw_usrreqs.pru_disconnect(so));
376 }
377
378 /*
379 * key_peeraddr()
380 * derived from net/rtsock.c:rts_peeraddr()
381 */
382 static int
383 key_peeraddr(struct socket *so, struct sockaddr **nam)
384 {
385 return(raw_usrreqs.pru_peeraddr(so, nam));
386 }
387
388 /*
389 * key_send()
390 * derived from net/rtsock.c:rts_send()
391 */
392 static int
393 key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
394 struct mbuf *control, struct thread *td)
395 {
396 return(raw_usrreqs.pru_send(so, flags, m, nam, control, td));
397 }
398
399 /*
400 * key_shutdown()
401 * derived from net/rtsock.c:rts_shutdown()
402 */
403 static int
404 key_shutdown(struct socket *so)
405 {
406 return(raw_usrreqs.pru_shutdown(so));
407 }
408
409 /*
410 * key_sockaddr()
411 * derived from net/rtsock.c:rts_sockaddr()
412 */
413 static int
414 key_sockaddr(struct socket *so, struct sockaddr **nam)
415 {
416 return(raw_usrreqs.pru_sockaddr(so, nam));
417 }
418
419 struct pr_usrreqs key_usrreqs = {
420 .pru_abort = key_abort,
421 .pru_attach = key_attach,
422 .pru_bind = key_bind,
423 .pru_connect = key_connect,
424 .pru_detach = key_detach,
425 .pru_disconnect = key_disconnect,
426 .pru_peeraddr = key_peeraddr,
427 .pru_send = key_send,
428 .pru_shutdown = key_shutdown,
429 .pru_sockaddr = key_sockaddr,
430 .pru_close = key_close,
431 };
432
433 /* sysctl */
434 SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family");
435
436 /*
437 * Definitions of protocols supported in the KEY domain.
438 */
439
440 extern struct domain keydomain;
441
442 struct protosw keysw[] = {
443 {
444 .pr_type = SOCK_RAW,
445 .pr_domain = &keydomain,
446 .pr_protocol = PF_KEY_V2,
447 .pr_flags = PR_ATOMIC|PR_ADDR,
448 .pr_output = key_output,
449 .pr_ctlinput = raw_ctlinput,
450 .pr_init = raw_init,
451 .pr_usrreqs = &key_usrreqs
452 }
453 };
454
455 static void
456 key_init0(void)
457 {
458
459 bzero((caddr_t)&V_key_cb, sizeof(V_key_cb));
460 key_init();
461 }
462
463 struct domain keydomain = {
464 .dom_family = PF_KEY,
465 .dom_name = "key",
466 .dom_init = key_init0,
467 #ifdef VIMAGE
468 .dom_destroy = key_destroy,
469 #endif
470 .dom_protosw = keysw,
471 .dom_protoswNPROTOSW = &keysw[nitems(keysw)]
472 };
473
474 VNET_DOMAIN_SET(key);
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