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