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