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 #include "opt_route.h" 35 36 /* This code has derived from sys/net/rtsock.c on FreeBSD2.2.5 */ 37 38 #include <sys/types.h> 39 #include <sys/param.h> 40 #include <sys/domain.h> 41 #include <sys/errno.h> 42 #include <sys/kernel.h> 43 #include <sys/lock.h> 44 #include <sys/malloc.h> 45 #include <sys/mbuf.h> 46 #include <sys/mutex.h> 47 #include <sys/priv.h> 48 #include <sys/protosw.h> 49 #include <sys/signalvar.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/sysctl.h> 53 #include <sys/systm.h> 54 #include <sys/vimage.h> 55 56 #include <net/if.h> 57 #include <net/raw_cb.h> 58 #include <net/route.h> 59 #include <net/vnet.h> 60 61 #include <netinet/in.h> 62 63 #include <net/pfkeyv2.h> 64 #include <netipsec/key.h> 65 #include <netipsec/keysock.h> 66 #include <netipsec/key_debug.h> 67 #include <netipsec/ipsec.h> 68 69 #include <machine/stdarg.h> 70 71 #ifdef VIMAGE_GLOBALS 72 static struct key_cb key_cb; 73 struct pfkeystat pfkeystat; 74 #endif 75 76 static struct sockaddr key_src = { 2, PF_KEY }; 77 78 static int key_sendup0 __P((struct rawcb *, struct mbuf *, int)); 79 80 /* 81 * key_output() 82 */ 83 int 84 key_output(struct mbuf *m, struct socket *so) 85 { 86 INIT_VNET_IPSEC(curvnet); 87 struct sadb_msg *msg; 88 int len, error = 0; 89 90 if (m == 0) 91 panic("%s: NULL pointer was passed.\n", __func__); 92 93 V_pfkeystat.out_total++; 94 V_pfkeystat.out_bytes += m->m_pkthdr.len; 95 96 len = m->m_pkthdr.len; 97 if (len < sizeof(struct sadb_msg)) { 98 V_pfkeystat.out_tooshort++; 99 error = EINVAL; 100 goto end; 101 } 102 103 if (m->m_len < sizeof(struct sadb_msg)) { 104 if ((m = m_pullup(m, sizeof(struct sadb_msg))) == 0) { 105 V_pfkeystat.out_nomem++; 106 error = ENOBUFS; 107 goto end; 108 } 109 } 110 111 M_ASSERTPKTHDR(m); 112 113 KEYDEBUG(KEYDEBUG_KEY_DUMP, kdebug_mbuf(m)); 114 115 msg = mtod(m, struct sadb_msg *); 116 V_pfkeystat.out_msgtype[msg->sadb_msg_type]++; 117 if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) { 118 V_pfkeystat.out_invlen++; 119 error = EINVAL; 120 goto end; 121 } 122 123 error = key_parse(m, so); 124 m = NULL; 125 end: 126 if (m) 127 m_freem(m); 128 return error; 129 } 130 131 /* 132 * send message to the socket. 133 */ 134 static int 135 key_sendup0(rp, m, promisc) 136 struct rawcb *rp; 137 struct mbuf *m; 138 int promisc; 139 { 140 INIT_VNET_IPSEC(curvnet); 141 int error; 142 143 if (promisc) { 144 struct sadb_msg *pmsg; 145 146 M_PREPEND(m, sizeof(struct sadb_msg), M_DONTWAIT); 147 if (m && m->m_len < sizeof(struct sadb_msg)) 148 m = m_pullup(m, sizeof(struct sadb_msg)); 149 if (!m) { 150 V_pfkeystat.in_nomem++; 151 m_freem(m); 152 return ENOBUFS; 153 } 154 m->m_pkthdr.len += sizeof(*pmsg); 155 156 pmsg = mtod(m, struct sadb_msg *); 157 bzero(pmsg, sizeof(*pmsg)); 158 pmsg->sadb_msg_version = PF_KEY_V2; 159 pmsg->sadb_msg_type = SADB_X_PROMISC; 160 pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 161 /* pid and seq? */ 162 163 V_pfkeystat.in_msgtype[pmsg->sadb_msg_type]++; 164 } 165 166 if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src, 167 m, NULL)) { 168 V_pfkeystat.in_nomem++; 169 m_freem(m); 170 error = ENOBUFS; 171 } else 172 error = 0; 173 sorwakeup(rp->rcb_socket); 174 return error; 175 } 176 177 /* XXX this interface should be obsoleted. */ 178 int 179 key_sendup(so, msg, len, target) 180 struct socket *so; 181 struct sadb_msg *msg; 182 u_int len; 183 int target; /*target of the resulting message*/ 184 { 185 INIT_VNET_IPSEC(curvnet); 186 struct mbuf *m, *n, *mprev; 187 int tlen; 188 189 /* sanity check */ 190 if (so == 0 || msg == 0) 191 panic("%s: NULL pointer was passed.\n", __func__); 192 193 KEYDEBUG(KEYDEBUG_KEY_DUMP, 194 printf("%s: \n", __func__); 195 kdebug_sadb(msg)); 196 197 /* 198 * we increment statistics here, just in case we have ENOBUFS 199 * in this function. 200 */ 201 V_pfkeystat.in_total++; 202 V_pfkeystat.in_bytes += len; 203 V_pfkeystat.in_msgtype[msg->sadb_msg_type]++; 204 205 /* 206 * Get mbuf chain whenever possible (not clusters), 207 * to save socket buffer. We'll be generating many SADB_ACQUIRE 208 * messages to listening key sockets. If we simply allocate clusters, 209 * sbappendaddr() will raise ENOBUFS due to too little sbspace(). 210 * sbspace() computes # of actual data bytes AND mbuf region. 211 * 212 * TODO: SADB_ACQUIRE filters should be implemented. 213 */ 214 tlen = len; 215 m = mprev = NULL; 216 while (tlen > 0) { 217 if (tlen == len) { 218 MGETHDR(n, M_DONTWAIT, MT_DATA); 219 if (n == NULL) { 220 V_pfkeystat.in_nomem++; 221 return ENOBUFS; 222 } 223 n->m_len = MHLEN; 224 } else { 225 MGET(n, M_DONTWAIT, MT_DATA); 226 if (n == NULL) { 227 V_pfkeystat.in_nomem++; 228 return ENOBUFS; 229 } 230 n->m_len = MLEN; 231 } 232 if (tlen >= MCLBYTES) { /*XXX better threshold? */ 233 MCLGET(n, M_DONTWAIT); 234 if ((n->m_flags & M_EXT) == 0) { 235 m_free(n); 236 m_freem(m); 237 V_pfkeystat.in_nomem++; 238 return ENOBUFS; 239 } 240 n->m_len = MCLBYTES; 241 } 242 243 if (tlen < n->m_len) 244 n->m_len = tlen; 245 n->m_next = NULL; 246 if (m == NULL) 247 m = mprev = n; 248 else { 249 mprev->m_next = n; 250 mprev = n; 251 } 252 tlen -= n->m_len; 253 n = NULL; 254 } 255 m->m_pkthdr.len = len; 256 m->m_pkthdr.rcvif = NULL; 257 m_copyback(m, 0, len, (caddr_t)msg); 258 259 /* avoid duplicated statistics */ 260 V_pfkeystat.in_total--; 261 V_pfkeystat.in_bytes -= len; 262 V_pfkeystat.in_msgtype[msg->sadb_msg_type]--; 263 264 return key_sendup_mbuf(so, m, target); 265 } 266 267 /* so can be NULL if target != KEY_SENDUP_ONE */ 268 int 269 key_sendup_mbuf(so, m, target) 270 struct socket *so; 271 struct mbuf *m; 272 int target; 273 { 274 INIT_VNET_NET(curvnet); 275 INIT_VNET_IPSEC(curvnet); 276 struct mbuf *n; 277 struct keycb *kp; 278 int sendup; 279 struct rawcb *rp; 280 int error = 0; 281 282 if (m == NULL) 283 panic("key_sendup_mbuf: NULL pointer was passed.\n"); 284 if (so == NULL && target == KEY_SENDUP_ONE) 285 panic("%s: NULL pointer was passed.\n", __func__); 286 287 V_pfkeystat.in_total++; 288 V_pfkeystat.in_bytes += m->m_pkthdr.len; 289 if (m->m_len < sizeof(struct sadb_msg)) { 290 m = m_pullup(m, sizeof(struct sadb_msg)); 291 if (m == NULL) { 292 V_pfkeystat.in_nomem++; 293 return ENOBUFS; 294 } 295 } 296 if (m->m_len >= sizeof(struct sadb_msg)) { 297 struct sadb_msg *msg; 298 msg = mtod(m, struct sadb_msg *); 299 V_pfkeystat.in_msgtype[msg->sadb_msg_type]++; 300 } 301 mtx_lock(&rawcb_mtx); 302 LIST_FOREACH(rp, &V_rawcb_list, list) 303 { 304 if (rp->rcb_proto.sp_family != PF_KEY) 305 continue; 306 if (rp->rcb_proto.sp_protocol 307 && rp->rcb_proto.sp_protocol != PF_KEY_V2) { 308 continue; 309 } 310 311 kp = (struct keycb *)rp; 312 313 /* 314 * If you are in promiscuous mode, and when you get broadcasted 315 * reply, you'll get two PF_KEY messages. 316 * (based on pf_key@inner.net message on 14 Oct 1998) 317 */ 318 if (((struct keycb *)rp)->kp_promisc) { 319 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 320 (void)key_sendup0(rp, n, 1); 321 n = NULL; 322 } 323 } 324 325 /* the exact target will be processed later */ 326 if (so && sotorawcb(so) == rp) 327 continue; 328 329 sendup = 0; 330 switch (target) { 331 case KEY_SENDUP_ONE: 332 /* the statement has no effect */ 333 if (so && sotorawcb(so) == rp) 334 sendup++; 335 break; 336 case KEY_SENDUP_ALL: 337 sendup++; 338 break; 339 case KEY_SENDUP_REGISTERED: 340 if (kp->kp_registered) 341 sendup++; 342 break; 343 } 344 V_pfkeystat.in_msgtarget[target]++; 345 346 if (!sendup) 347 continue; 348 349 if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) { 350 m_freem(m); 351 V_pfkeystat.in_nomem++; 352 mtx_unlock(&rawcb_mtx); 353 return ENOBUFS; 354 } 355 356 if ((error = key_sendup0(rp, n, 0)) != 0) { 357 m_freem(m); 358 mtx_unlock(&rawcb_mtx); 359 return error; 360 } 361 362 n = NULL; 363 } 364 365 if (so) { 366 error = key_sendup0(sotorawcb(so), m, 0); 367 m = NULL; 368 } else { 369 error = 0; 370 m_freem(m); 371 } 372 mtx_unlock(&rawcb_mtx); 373 return error; 374 } 375 376 /* 377 * key_abort() 378 * derived from net/rtsock.c:rts_abort() 379 */ 380 static void 381 key_abort(struct socket *so) 382 { 383 raw_usrreqs.pru_abort(so); 384 } 385 386 /* 387 * key_attach() 388 * derived from net/rtsock.c:rts_attach() 389 */ 390 static int 391 key_attach(struct socket *so, int proto, struct thread *td) 392 { 393 INIT_VNET_IPSEC(curvnet); 394 struct keycb *kp; 395 int error; 396 397 KASSERT(so->so_pcb == NULL, ("key_attach: so_pcb != NULL")); 398 399 if (td != NULL) { 400 error = priv_check(td, PRIV_NET_RAW); 401 if (error) 402 return error; 403 } 404 405 /* XXX */ 406 kp = malloc(sizeof *kp, M_PCB, M_WAITOK | M_ZERO); 407 if (kp == 0) 408 return ENOBUFS; 409 410 so->so_pcb = (caddr_t)kp; 411 error = raw_attach(so, proto); 412 kp = (struct keycb *)sotorawcb(so); 413 if (error) { 414 free(kp, M_PCB); 415 so->so_pcb = (caddr_t) 0; 416 return error; 417 } 418 419 kp->kp_promisc = kp->kp_registered = 0; 420 421 if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */ 422 V_key_cb.key_count++; 423 V_key_cb.any_count++; 424 soisconnected(so); 425 so->so_options |= SO_USELOOPBACK; 426 427 return 0; 428 } 429 430 /* 431 * key_bind() 432 * derived from net/rtsock.c:rts_bind() 433 */ 434 static int 435 key_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 436 { 437 return EINVAL; 438 } 439 440 /* 441 * key_close() 442 * derived from net/rtsock.c:rts_close(). 443 */ 444 static void 445 key_close(struct socket *so) 446 { 447 448 raw_usrreqs.pru_close(so); 449 } 450 451 /* 452 * key_connect() 453 * derived from net/rtsock.c:rts_connect() 454 */ 455 static int 456 key_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 457 { 458 return EINVAL; 459 } 460 461 /* 462 * key_detach() 463 * derived from net/rtsock.c:rts_detach() 464 */ 465 static void 466 key_detach(struct socket *so) 467 { 468 INIT_VNET_IPSEC(curvnet); 469 struct keycb *kp = (struct keycb *)sotorawcb(so); 470 471 KASSERT(kp != NULL, ("key_detach: kp == NULL")); 472 if (kp->kp_raw.rcb_proto.sp_protocol 473 == PF_KEY) /* XXX: AF_KEY */ 474 V_key_cb.key_count--; 475 V_key_cb.any_count--; 476 477 key_freereg(so); 478 raw_usrreqs.pru_detach(so); 479 } 480 481 /* 482 * key_disconnect() 483 * derived from net/rtsock.c:key_disconnect() 484 */ 485 static int 486 key_disconnect(struct socket *so) 487 { 488 return(raw_usrreqs.pru_disconnect(so)); 489 } 490 491 /* 492 * key_peeraddr() 493 * derived from net/rtsock.c:rts_peeraddr() 494 */ 495 static int 496 key_peeraddr(struct socket *so, struct sockaddr **nam) 497 { 498 return(raw_usrreqs.pru_peeraddr(so, nam)); 499 } 500 501 /* 502 * key_send() 503 * derived from net/rtsock.c:rts_send() 504 */ 505 static int 506 key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 507 struct mbuf *control, struct thread *td) 508 { 509 return(raw_usrreqs.pru_send(so, flags, m, nam, control, td)); 510 } 511 512 /* 513 * key_shutdown() 514 * derived from net/rtsock.c:rts_shutdown() 515 */ 516 static int 517 key_shutdown(struct socket *so) 518 { 519 return(raw_usrreqs.pru_shutdown(so)); 520 } 521 522 /* 523 * key_sockaddr() 524 * derived from net/rtsock.c:rts_sockaddr() 525 */ 526 static int 527 key_sockaddr(struct socket *so, struct sockaddr **nam) 528 { 529 return(raw_usrreqs.pru_sockaddr(so, nam)); 530 } 531 532 struct pr_usrreqs key_usrreqs = { 533 .pru_abort = key_abort, 534 .pru_attach = key_attach, 535 .pru_bind = key_bind, 536 .pru_connect = key_connect, 537 .pru_detach = key_detach, 538 .pru_disconnect = key_disconnect, 539 .pru_peeraddr = key_peeraddr, 540 .pru_send = key_send, 541 .pru_shutdown = key_shutdown, 542 .pru_sockaddr = key_sockaddr, 543 .pru_close = key_close, 544 }; 545 546 /* sysctl */ 547 SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family"); 548 549 /* 550 * Definitions of protocols supported in the KEY domain. 551 */ 552 553 extern struct domain keydomain; 554 555 struct protosw keysw[] = { 556 { 557 .pr_type = SOCK_RAW, 558 .pr_domain = &keydomain, 559 .pr_protocol = PF_KEY_V2, 560 .pr_flags = PR_ATOMIC|PR_ADDR, 561 .pr_output = key_output, 562 .pr_ctlinput = raw_ctlinput, 563 .pr_init = raw_init, 564 .pr_usrreqs = &key_usrreqs 565 } 566 }; 567 568 static void 569 key_init0(void) 570 { 571 INIT_VNET_IPSEC(curvnet); 572 573 bzero((caddr_t)&V_key_cb, sizeof(V_key_cb)); 574 ipsec_init(); 575 key_init(); 576 } 577 578 struct domain keydomain = { 579 .dom_family = PF_KEY, 580 .dom_name = "key", 581 .dom_init = key_init0, 582 .dom_protosw = keysw, 583 .dom_protoswNPROTOSW = &keysw[sizeof(keysw)/sizeof(keysw[0])] 584 }; 585 586 DOMAIN_SET(key); 587