Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netipsec/keysock.c
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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);
Cache object: 259bc23dd77ec88b50c496ed1f33202b
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