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/5.0/sys/netipsec/keysock.c 105197 2002-10-16 02:10:08Z sam $ */ 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 if ((m->m_flags & M_PKTHDR) == 0) 118 panic("key_output: not M_PKTHDR ??"); 119 120 KEYDEBUG(KEYDEBUG_KEY_DUMP, kdebug_mbuf(m)); 121 122 msg = mtod(m, struct sadb_msg *); 123 pfkeystat.out_msgtype[msg->sadb_msg_type]++; 124 if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) { 125 pfkeystat.out_invlen++; 126 error = EINVAL; 127 goto end; 128 } 129 130 /*XXX giant lock*/ 131 s = splnet(); 132 error = key_parse(m, so); 133 m = NULL; 134 splx(s); 135 end: 136 if (m) 137 m_freem(m); 138 return error; 139 } 140 141 /* 142 * send message to the socket. 143 */ 144 static int 145 key_sendup0(rp, m, promisc) 146 struct rawcb *rp; 147 struct mbuf *m; 148 int promisc; 149 { 150 int error; 151 152 if (promisc) { 153 struct sadb_msg *pmsg; 154 155 M_PREPEND(m, sizeof(struct sadb_msg), M_NOWAIT); 156 if (m && m->m_len < sizeof(struct sadb_msg)) 157 m = m_pullup(m, sizeof(struct sadb_msg)); 158 if (!m) { 159 pfkeystat.in_nomem++; 160 m_freem(m); 161 return ENOBUFS; 162 } 163 m->m_pkthdr.len += sizeof(*pmsg); 164 165 pmsg = mtod(m, struct sadb_msg *); 166 bzero(pmsg, sizeof(*pmsg)); 167 pmsg->sadb_msg_version = PF_KEY_V2; 168 pmsg->sadb_msg_type = SADB_X_PROMISC; 169 pmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 170 /* pid and seq? */ 171 172 pfkeystat.in_msgtype[pmsg->sadb_msg_type]++; 173 } 174 175 if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src, 176 m, NULL)) { 177 pfkeystat.in_nomem++; 178 m_freem(m); 179 error = ENOBUFS; 180 } else 181 error = 0; 182 sorwakeup(rp->rcb_socket); 183 return error; 184 } 185 186 /* XXX this interface should be obsoleted. */ 187 int 188 key_sendup(so, msg, len, target) 189 struct socket *so; 190 struct sadb_msg *msg; 191 u_int len; 192 int target; /*target of the resulting message*/ 193 { 194 struct mbuf *m, *n, *mprev; 195 int tlen; 196 197 /* sanity check */ 198 if (so == 0 || msg == 0) 199 panic("key_sendup: NULL pointer was passed.\n"); 200 201 KEYDEBUG(KEYDEBUG_KEY_DUMP, 202 printf("key_sendup: \n"); 203 kdebug_sadb(msg)); 204 205 /* 206 * we increment statistics here, just in case we have ENOBUFS 207 * in this function. 208 */ 209 pfkeystat.in_total++; 210 pfkeystat.in_bytes += len; 211 pfkeystat.in_msgtype[msg->sadb_msg_type]++; 212 213 /* 214 * Get mbuf chain whenever possible (not clusters), 215 * to save socket buffer. We'll be generating many SADB_ACQUIRE 216 * messages to listening key sockets. If we simply allocate clusters, 217 * sbappendaddr() will raise ENOBUFS due to too little sbspace(). 218 * sbspace() computes # of actual data bytes AND mbuf region. 219 * 220 * TODO: SADB_ACQUIRE filters should be implemented. 221 */ 222 tlen = len; 223 m = mprev = NULL; 224 while (tlen > 0) { 225 if (tlen == len) { 226 MGETHDR(n, M_DONTWAIT, MT_DATA); 227 n->m_len = MHLEN; 228 } else { 229 MGET(n, M_DONTWAIT, MT_DATA); 230 n->m_len = MLEN; 231 } 232 if (!n) { 233 pfkeystat.in_nomem++; 234 return ENOBUFS; 235 } 236 if (tlen >= MCLBYTES) { /*XXX better threshold? */ 237 MCLGET(n, M_DONTWAIT); 238 if ((n->m_flags & M_EXT) == 0) { 239 m_free(n); 240 m_freem(m); 241 pfkeystat.in_nomem++; 242 return ENOBUFS; 243 } 244 n->m_len = MCLBYTES; 245 } 246 247 if (tlen < n->m_len) 248 n->m_len = tlen; 249 n->m_next = NULL; 250 if (m == NULL) 251 m = mprev = n; 252 else { 253 mprev->m_next = n; 254 mprev = n; 255 } 256 tlen -= n->m_len; 257 n = NULL; 258 } 259 m->m_pkthdr.len = len; 260 m->m_pkthdr.rcvif = NULL; 261 m_copyback(m, 0, len, (caddr_t)msg); 262 263 /* avoid duplicated statistics */ 264 pfkeystat.in_total--; 265 pfkeystat.in_bytes -= len; 266 pfkeystat.in_msgtype[msg->sadb_msg_type]--; 267 268 return key_sendup_mbuf(so, m, target); 269 } 270 271 /* so can be NULL if target != KEY_SENDUP_ONE */ 272 int 273 key_sendup_mbuf(so, m, target) 274 struct socket *so; 275 struct mbuf *m; 276 int target; 277 { 278 struct mbuf *n; 279 struct keycb *kp; 280 int sendup; 281 struct rawcb *rp; 282 int error = 0; 283 284 if (m == NULL) 285 panic("key_sendup_mbuf: NULL pointer was passed.\n"); 286 if (so == NULL && target == KEY_SENDUP_ONE) 287 panic("key_sendup_mbuf: NULL pointer was passed.\n"); 288 289 pfkeystat.in_total++; 290 pfkeystat.in_bytes += m->m_pkthdr.len; 291 if (m->m_len < sizeof(struct sadb_msg)) { 292 #if 1 293 m = m_pullup(m, sizeof(struct sadb_msg)); 294 if (m == NULL) { 295 pfkeystat.in_nomem++; 296 return ENOBUFS; 297 } 298 #else 299 /* don't bother pulling it up just for stats */ 300 #endif 301 } 302 if (m->m_len >= sizeof(struct sadb_msg)) { 303 struct sadb_msg *msg; 304 msg = mtod(m, struct sadb_msg *); 305 pfkeystat.in_msgtype[msg->sadb_msg_type]++; 306 } 307 308 LIST_FOREACH(rp, &rawcb_list, list) 309 { 310 if (rp->rcb_proto.sp_family != PF_KEY) 311 continue; 312 if (rp->rcb_proto.sp_protocol 313 && rp->rcb_proto.sp_protocol != PF_KEY_V2) { 314 continue; 315 } 316 317 kp = (struct keycb *)rp; 318 319 /* 320 * If you are in promiscuous mode, and when you get broadcasted 321 * reply, you'll get two PF_KEY messages. 322 * (based on pf_key@inner.net message on 14 Oct 1998) 323 */ 324 if (((struct keycb *)rp)->kp_promisc) { 325 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 326 (void)key_sendup0(rp, n, 1); 327 n = NULL; 328 } 329 } 330 331 /* the exact target will be processed later */ 332 if (so && sotorawcb(so) == rp) 333 continue; 334 335 sendup = 0; 336 switch (target) { 337 case KEY_SENDUP_ONE: 338 /* the statement has no effect */ 339 if (so && sotorawcb(so) == rp) 340 sendup++; 341 break; 342 case KEY_SENDUP_ALL: 343 sendup++; 344 break; 345 case KEY_SENDUP_REGISTERED: 346 if (kp->kp_registered) 347 sendup++; 348 break; 349 } 350 pfkeystat.in_msgtarget[target]++; 351 352 if (!sendup) 353 continue; 354 355 if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) { 356 m_freem(m); 357 pfkeystat.in_nomem++; 358 return ENOBUFS; 359 } 360 361 if ((error = key_sendup0(rp, n, 0)) != 0) { 362 m_freem(m); 363 return error; 364 } 365 366 n = NULL; 367 } 368 369 if (so) { 370 error = key_sendup0(sotorawcb(so), m, 0); 371 m = NULL; 372 } else { 373 error = 0; 374 m_freem(m); 375 } 376 return error; 377 } 378 379 /* 380 * key_abort() 381 * derived from net/rtsock.c:rts_abort() 382 */ 383 static int 384 key_abort(struct socket *so) 385 { 386 int s, error; 387 s = splnet(); 388 error = raw_usrreqs.pru_abort(so); 389 splx(s); 390 return error; 391 } 392 393 /* 394 * key_attach() 395 * derived from net/rtsock.c:rts_attach() 396 */ 397 static int 398 key_attach(struct socket *so, int proto, struct thread *td) 399 { 400 struct keycb *kp; 401 int s, error; 402 403 if (sotorawcb(so) != 0) 404 return EISCONN; /* XXX panic? */ 405 kp = (struct keycb *)malloc(sizeof *kp, M_PCB, M_WAITOK|M_ZERO); /* XXX */ 406 if (kp == 0) 407 return ENOBUFS; 408 409 /* 410 * The splnet() is necessary to block protocols from sending 411 * error notifications (like RTM_REDIRECT or RTM_LOSING) while 412 * this PCB is extant but incompletely initialized. 413 * Probably we should try to do more of this work beforehand and 414 * eliminate the spl. 415 */ 416 s = splnet(); 417 so->so_pcb = (caddr_t)kp; 418 error = raw_usrreqs.pru_attach(so, proto, td); 419 kp = (struct keycb *)sotorawcb(so); 420 if (error) { 421 free(kp, M_PCB); 422 so->so_pcb = (caddr_t) 0; 423 splx(s); 424 return error; 425 } 426 427 kp->kp_promisc = kp->kp_registered = 0; 428 429 if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */ 430 key_cb.key_count++; 431 key_cb.any_count++; 432 kp->kp_raw.rcb_laddr = &key_src; 433 kp->kp_raw.rcb_faddr = &key_dst; 434 soisconnected(so); 435 so->so_options |= SO_USELOOPBACK; 436 437 splx(s); 438 return 0; 439 } 440 441 /* 442 * key_bind() 443 * derived from net/rtsock.c:rts_bind() 444 */ 445 static int 446 key_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 447 { 448 int s, error; 449 s = splnet(); 450 error = raw_usrreqs.pru_bind(so, nam, td); /* xxx just EINVAL */ 451 splx(s); 452 return error; 453 } 454 455 /* 456 * key_connect() 457 * derived from net/rtsock.c:rts_connect() 458 */ 459 static int 460 key_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 461 { 462 int s, error; 463 s = splnet(); 464 error = raw_usrreqs.pru_connect(so, nam, td); /* XXX just EINVAL */ 465 splx(s); 466 return error; 467 } 468 469 /* 470 * key_detach() 471 * derived from net/rtsock.c:rts_detach() 472 */ 473 static int 474 key_detach(struct socket *so) 475 { 476 struct keycb *kp = (struct keycb *)sotorawcb(so); 477 int s, error; 478 479 s = splnet(); 480 if (kp != 0) { 481 if (kp->kp_raw.rcb_proto.sp_protocol 482 == PF_KEY) /* XXX: AF_KEY */ 483 key_cb.key_count--; 484 key_cb.any_count--; 485 486 key_freereg(so); 487 } 488 error = raw_usrreqs.pru_detach(so); 489 splx(s); 490 return error; 491 } 492 493 /* 494 * key_disconnect() 495 * derived from net/rtsock.c:key_disconnect() 496 */ 497 static int 498 key_disconnect(struct socket *so) 499 { 500 int s, error; 501 s = splnet(); 502 error = raw_usrreqs.pru_disconnect(so); 503 splx(s); 504 return error; 505 } 506 507 /* 508 * key_peeraddr() 509 * derived from net/rtsock.c:rts_peeraddr() 510 */ 511 static int 512 key_peeraddr(struct socket *so, struct sockaddr **nam) 513 { 514 int s, error; 515 s = splnet(); 516 error = raw_usrreqs.pru_peeraddr(so, nam); 517 splx(s); 518 return error; 519 } 520 521 /* 522 * key_send() 523 * derived from net/rtsock.c:rts_send() 524 */ 525 static int 526 key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 527 struct mbuf *control, struct thread *td) 528 { 529 int s, error; 530 s = splnet(); 531 error = raw_usrreqs.pru_send(so, flags, m, nam, control, td); 532 splx(s); 533 return error; 534 } 535 536 /* 537 * key_shutdown() 538 * derived from net/rtsock.c:rts_shutdown() 539 */ 540 static int 541 key_shutdown(struct socket *so) 542 { 543 int s, error; 544 s = splnet(); 545 error = raw_usrreqs.pru_shutdown(so); 546 splx(s); 547 return error; 548 } 549 550 /* 551 * key_sockaddr() 552 * derived from net/rtsock.c:rts_sockaddr() 553 */ 554 static int 555 key_sockaddr(struct socket *so, struct sockaddr **nam) 556 { 557 int s, error; 558 s = splnet(); 559 error = raw_usrreqs.pru_sockaddr(so, nam); 560 splx(s); 561 return error; 562 } 563 564 struct pr_usrreqs key_usrreqs = { 565 key_abort, pru_accept_notsupp, key_attach, key_bind, 566 key_connect, 567 pru_connect2_notsupp, pru_control_notsupp, key_detach, 568 key_disconnect, pru_listen_notsupp, key_peeraddr, 569 pru_rcvd_notsupp, 570 pru_rcvoob_notsupp, key_send, pru_sense_null, key_shutdown, 571 key_sockaddr, sosend, soreceive, sopoll 572 }; 573 574 /* sysctl */ 575 SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family"); 576 577 /* 578 * Definitions of protocols supported in the KEY domain. 579 */ 580 581 extern struct domain keydomain; 582 583 struct protosw keysw[] = { 584 { SOCK_RAW, &keydomain, PF_KEY_V2, PR_ATOMIC|PR_ADDR, 585 0, (pr_output_t *)key_output, raw_ctlinput, 0, 586 0, 587 raw_init, 0, 0, 0, 588 &key_usrreqs 589 } 590 }; 591 592 static void 593 key_init0(void) 594 { 595 bzero((caddr_t)&key_cb, sizeof(key_cb)); 596 key_init(); 597 } 598 599 struct domain keydomain = 600 { PF_KEY, "key", key_init0, 0, 0, 601 keysw, &keysw[sizeof(keysw)/sizeof(keysw[0])] }; 602 603 DOMAIN_SET(key);
Cache object: fd123392305a8f2a4278cee03a904e9f
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