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/9.2/sys/netipsec/keysock.c 252693 2013-07-04 08:59:34Z 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/raw_cb.h> 56 #include <net/route.h> 57 #include <net/vnet.h> 58 59 #include <netinet/in.h> 60 61 #include <net/pfkeyv2.h> 62 #include <netipsec/key.h> 63 #include <netipsec/keysock.h> 64 #include <netipsec/key_debug.h> 65 #include <netipsec/ipsec.h> 66 67 #include <machine/stdarg.h> 68 69 struct key_cb { 70 int key_count; 71 int any_count; 72 }; 73 static VNET_DEFINE(struct key_cb, key_cb); 74 #define V_key_cb VNET(key_cb) 75 76 static struct sockaddr key_src = { 2, PF_KEY, }; 77 78 static int key_sendup0 __P((struct rawcb *, struct mbuf *, int)); 79 80 VNET_DEFINE(struct pfkeystat, pfkeystat); 81 82 /* 83 * key_output() 84 */ 85 int 86 key_output(struct mbuf *m, struct socket *so) 87 { 88 struct sadb_msg *msg; 89 int len, error = 0; 90 91 if (m == 0) 92 panic("%s: NULL pointer was passed.\n", __func__); 93 94 PFKEYSTAT_INC(out_total); 95 PFKEYSTAT_ADD(out_bytes, m->m_pkthdr.len); 96 97 len = m->m_pkthdr.len; 98 if (len < sizeof(struct sadb_msg)) { 99 PFKEYSTAT_INC(out_tooshort); 100 error = EINVAL; 101 goto end; 102 } 103 104 if (m->m_len < sizeof(struct sadb_msg)) { 105 if ((m = m_pullup(m, sizeof(struct sadb_msg))) == 0) { 106 PFKEYSTAT_INC(out_nomem); 107 error = ENOBUFS; 108 goto end; 109 } 110 } 111 112 M_ASSERTPKTHDR(m); 113 114 KEYDEBUG(KEYDEBUG_KEY_DUMP, kdebug_mbuf(m)); 115 116 msg = mtod(m, struct sadb_msg *); 117 PFKEYSTAT_INC(out_msgtype[msg->sadb_msg_type]); 118 if (len != PFKEY_UNUNIT64(msg->sadb_msg_len)) { 119 PFKEYSTAT_INC(out_invlen); 120 error = EINVAL; 121 goto end; 122 } 123 124 error = key_parse(m, so); 125 m = NULL; 126 end: 127 if (m) 128 m_freem(m); 129 return error; 130 } 131 132 /* 133 * send message to the socket. 134 */ 135 static int 136 key_sendup0(rp, m, promisc) 137 struct rawcb *rp; 138 struct mbuf *m; 139 int promisc; 140 { 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 PFKEYSTAT_INC(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 PFKEYSTAT_INC(in_msgtype[pmsg->sadb_msg_type]); 164 } 165 166 if (!sbappendaddr(&rp->rcb_socket->so_rcv, (struct sockaddr *)&key_src, 167 m, NULL)) { 168 PFKEYSTAT_INC(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 struct mbuf *m, *n, *mprev; 186 int tlen; 187 188 /* sanity check */ 189 if (so == 0 || msg == 0) 190 panic("%s: NULL pointer was passed.\n", __func__); 191 192 KEYDEBUG(KEYDEBUG_KEY_DUMP, 193 printf("%s: \n", __func__); 194 kdebug_sadb(msg)); 195 196 /* 197 * we increment statistics here, just in case we have ENOBUFS 198 * in this function. 199 */ 200 PFKEYSTAT_INC(in_total); 201 PFKEYSTAT_ADD(in_bytes, len); 202 PFKEYSTAT_INC(in_msgtype[msg->sadb_msg_type]); 203 204 /* 205 * Get mbuf chain whenever possible (not clusters), 206 * to save socket buffer. We'll be generating many SADB_ACQUIRE 207 * messages to listening key sockets. If we simply allocate clusters, 208 * sbappendaddr() will raise ENOBUFS due to too little sbspace(). 209 * sbspace() computes # of actual data bytes AND mbuf region. 210 * 211 * TODO: SADB_ACQUIRE filters should be implemented. 212 */ 213 tlen = len; 214 m = mprev = NULL; 215 while (tlen > 0) { 216 if (tlen == len) { 217 MGETHDR(n, M_DONTWAIT, MT_DATA); 218 if (n == NULL) { 219 PFKEYSTAT_INC(in_nomem); 220 return ENOBUFS; 221 } 222 n->m_len = MHLEN; 223 } else { 224 MGET(n, M_DONTWAIT, MT_DATA); 225 if (n == NULL) { 226 PFKEYSTAT_INC(in_nomem); 227 return ENOBUFS; 228 } 229 n->m_len = MLEN; 230 } 231 if (tlen >= MCLBYTES) { /*XXX better threshold? */ 232 MCLGET(n, M_DONTWAIT); 233 if ((n->m_flags & M_EXT) == 0) { 234 m_free(n); 235 m_freem(m); 236 PFKEYSTAT_INC(in_nomem); 237 return ENOBUFS; 238 } 239 n->m_len = MCLBYTES; 240 } 241 242 if (tlen < n->m_len) 243 n->m_len = tlen; 244 n->m_next = NULL; 245 if (m == NULL) 246 m = mprev = n; 247 else { 248 mprev->m_next = n; 249 mprev = n; 250 } 251 tlen -= n->m_len; 252 n = NULL; 253 } 254 m->m_pkthdr.len = len; 255 m->m_pkthdr.rcvif = NULL; 256 m_copyback(m, 0, len, (caddr_t)msg); 257 258 /* avoid duplicated statistics */ 259 PFKEYSTAT_ADD(in_total, -1); 260 PFKEYSTAT_ADD(in_bytes, -len); 261 PFKEYSTAT_ADD(in_msgtype[msg->sadb_msg_type], -1); 262 263 return key_sendup_mbuf(so, m, target); 264 } 265 266 /* so can be NULL if target != KEY_SENDUP_ONE */ 267 int 268 key_sendup_mbuf(so, m, target) 269 struct socket *so; 270 struct mbuf *m; 271 int target; 272 { 273 struct mbuf *n; 274 struct keycb *kp; 275 int sendup; 276 struct rawcb *rp; 277 int error = 0; 278 279 if (m == NULL) 280 panic("key_sendup_mbuf: NULL pointer was passed.\n"); 281 if (so == NULL && target == KEY_SENDUP_ONE) 282 panic("%s: NULL pointer was passed.\n", __func__); 283 284 PFKEYSTAT_INC(in_total); 285 PFKEYSTAT_ADD(in_bytes, m->m_pkthdr.len); 286 if (m->m_len < sizeof(struct sadb_msg)) { 287 m = m_pullup(m, sizeof(struct sadb_msg)); 288 if (m == NULL) { 289 PFKEYSTAT_INC(in_nomem); 290 return ENOBUFS; 291 } 292 } 293 if (m->m_len >= sizeof(struct sadb_msg)) { 294 struct sadb_msg *msg; 295 msg = mtod(m, struct sadb_msg *); 296 PFKEYSTAT_INC(in_msgtype[msg->sadb_msg_type]); 297 } 298 mtx_lock(&rawcb_mtx); 299 LIST_FOREACH(rp, &V_rawcb_list, list) 300 { 301 if (rp->rcb_proto.sp_family != PF_KEY) 302 continue; 303 if (rp->rcb_proto.sp_protocol 304 && rp->rcb_proto.sp_protocol != PF_KEY_V2) { 305 continue; 306 } 307 308 kp = (struct keycb *)rp; 309 310 /* 311 * If you are in promiscuous mode, and when you get broadcasted 312 * reply, you'll get two PF_KEY messages. 313 * (based on pf_key@inner.net message on 14 Oct 1998) 314 */ 315 if (((struct keycb *)rp)->kp_promisc) { 316 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 317 (void)key_sendup0(rp, n, 1); 318 n = NULL; 319 } 320 } 321 322 /* the exact target will be processed later */ 323 if (so && sotorawcb(so) == rp) 324 continue; 325 326 sendup = 0; 327 switch (target) { 328 case KEY_SENDUP_ONE: 329 /* the statement has no effect */ 330 if (so && sotorawcb(so) == rp) 331 sendup++; 332 break; 333 case KEY_SENDUP_ALL: 334 sendup++; 335 break; 336 case KEY_SENDUP_REGISTERED: 337 if (kp->kp_registered) 338 sendup++; 339 break; 340 } 341 PFKEYSTAT_INC(in_msgtarget[target]); 342 343 if (!sendup) 344 continue; 345 346 if ((n = m_copy(m, 0, (int)M_COPYALL)) == NULL) { 347 m_freem(m); 348 PFKEYSTAT_INC(in_nomem); 349 mtx_unlock(&rawcb_mtx); 350 return ENOBUFS; 351 } 352 353 if ((error = key_sendup0(rp, n, 0)) != 0) { 354 m_freem(m); 355 mtx_unlock(&rawcb_mtx); 356 return error; 357 } 358 359 n = NULL; 360 } 361 362 if (so) { 363 error = key_sendup0(sotorawcb(so), m, 0); 364 m = NULL; 365 } else { 366 error = 0; 367 m_freem(m); 368 } 369 mtx_unlock(&rawcb_mtx); 370 return error; 371 } 372 373 /* 374 * key_abort() 375 * derived from net/rtsock.c:rts_abort() 376 */ 377 static void 378 key_abort(struct socket *so) 379 { 380 raw_usrreqs.pru_abort(so); 381 } 382 383 /* 384 * key_attach() 385 * derived from net/rtsock.c:rts_attach() 386 */ 387 static int 388 key_attach(struct socket *so, int proto, struct thread *td) 389 { 390 struct keycb *kp; 391 int error; 392 393 KASSERT(so->so_pcb == NULL, ("key_attach: so_pcb != NULL")); 394 395 if (td != NULL) { 396 error = priv_check(td, PRIV_NET_RAW); 397 if (error) 398 return error; 399 } 400 401 /* XXX */ 402 kp = malloc(sizeof *kp, M_PCB, M_WAITOK | M_ZERO); 403 if (kp == 0) 404 return ENOBUFS; 405 406 so->so_pcb = (caddr_t)kp; 407 error = raw_attach(so, proto); 408 kp = (struct keycb *)sotorawcb(so); 409 if (error) { 410 free(kp, M_PCB); 411 so->so_pcb = (caddr_t) 0; 412 return error; 413 } 414 415 kp->kp_promisc = kp->kp_registered = 0; 416 417 if (kp->kp_raw.rcb_proto.sp_protocol == PF_KEY) /* XXX: AF_KEY */ 418 V_key_cb.key_count++; 419 V_key_cb.any_count++; 420 soisconnected(so); 421 so->so_options |= SO_USELOOPBACK; 422 423 return 0; 424 } 425 426 /* 427 * key_bind() 428 * derived from net/rtsock.c:rts_bind() 429 */ 430 static int 431 key_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 432 { 433 return EINVAL; 434 } 435 436 /* 437 * key_close() 438 * derived from net/rtsock.c:rts_close(). 439 */ 440 static void 441 key_close(struct socket *so) 442 { 443 444 raw_usrreqs.pru_close(so); 445 } 446 447 /* 448 * key_connect() 449 * derived from net/rtsock.c:rts_connect() 450 */ 451 static int 452 key_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 453 { 454 return EINVAL; 455 } 456 457 /* 458 * key_detach() 459 * derived from net/rtsock.c:rts_detach() 460 */ 461 static void 462 key_detach(struct socket *so) 463 { 464 struct keycb *kp = (struct keycb *)sotorawcb(so); 465 466 KASSERT(kp != NULL, ("key_detach: kp == NULL")); 467 if (kp->kp_raw.rcb_proto.sp_protocol 468 == PF_KEY) /* XXX: AF_KEY */ 469 V_key_cb.key_count--; 470 V_key_cb.any_count--; 471 472 key_freereg(so); 473 raw_usrreqs.pru_detach(so); 474 } 475 476 /* 477 * key_disconnect() 478 * derived from net/rtsock.c:key_disconnect() 479 */ 480 static int 481 key_disconnect(struct socket *so) 482 { 483 return(raw_usrreqs.pru_disconnect(so)); 484 } 485 486 /* 487 * key_peeraddr() 488 * derived from net/rtsock.c:rts_peeraddr() 489 */ 490 static int 491 key_peeraddr(struct socket *so, struct sockaddr **nam) 492 { 493 return(raw_usrreqs.pru_peeraddr(so, nam)); 494 } 495 496 /* 497 * key_send() 498 * derived from net/rtsock.c:rts_send() 499 */ 500 static int 501 key_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 502 struct mbuf *control, struct thread *td) 503 { 504 return(raw_usrreqs.pru_send(so, flags, m, nam, control, td)); 505 } 506 507 /* 508 * key_shutdown() 509 * derived from net/rtsock.c:rts_shutdown() 510 */ 511 static int 512 key_shutdown(struct socket *so) 513 { 514 return(raw_usrreqs.pru_shutdown(so)); 515 } 516 517 /* 518 * key_sockaddr() 519 * derived from net/rtsock.c:rts_sockaddr() 520 */ 521 static int 522 key_sockaddr(struct socket *so, struct sockaddr **nam) 523 { 524 return(raw_usrreqs.pru_sockaddr(so, nam)); 525 } 526 527 struct pr_usrreqs key_usrreqs = { 528 .pru_abort = key_abort, 529 .pru_attach = key_attach, 530 .pru_bind = key_bind, 531 .pru_connect = key_connect, 532 .pru_detach = key_detach, 533 .pru_disconnect = key_disconnect, 534 .pru_peeraddr = key_peeraddr, 535 .pru_send = key_send, 536 .pru_shutdown = key_shutdown, 537 .pru_sockaddr = key_sockaddr, 538 .pru_close = key_close, 539 }; 540 541 /* sysctl */ 542 SYSCTL_NODE(_net, PF_KEY, key, CTLFLAG_RW, 0, "Key Family"); 543 544 /* 545 * Definitions of protocols supported in the KEY domain. 546 */ 547 548 extern struct domain keydomain; 549 550 struct protosw keysw[] = { 551 { 552 .pr_type = SOCK_RAW, 553 .pr_domain = &keydomain, 554 .pr_protocol = PF_KEY_V2, 555 .pr_flags = PR_ATOMIC|PR_ADDR, 556 .pr_output = key_output, 557 .pr_ctlinput = raw_ctlinput, 558 .pr_init = raw_init, 559 .pr_usrreqs = &key_usrreqs 560 } 561 }; 562 563 static void 564 key_init0(void) 565 { 566 567 bzero((caddr_t)&V_key_cb, sizeof(V_key_cb)); 568 key_init(); 569 } 570 571 struct domain keydomain = { 572 .dom_family = PF_KEY, 573 .dom_name = "key", 574 .dom_init = key_init0, 575 #ifdef VIMAGE 576 .dom_destroy = key_destroy, 577 #endif 578 .dom_protosw = keysw, 579 .dom_protoswNPROTOSW = &keysw[sizeof(keysw)/sizeof(keysw[0])] 580 }; 581 582 VNET_DOMAIN_SET(key);
Cache object: 737d8321383b6aada39ec1e06d4e378f
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