1 /* $NetBSD: in_proto.c,v 1.103 2012/03/22 20:34:38 drochner Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1986, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)in_proto.c 8.2 (Berkeley) 2/9/95 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: in_proto.c,v 1.103 2012/03/22 20:34:38 drochner Exp $"); 65 66 #include "opt_mrouting.h" 67 #include "opt_eon.h" /* ISO CLNL over IP */ 68 #include "opt_iso.h" /* ISO TP tunneled over IP */ 69 #include "opt_inet.h" 70 #include "opt_ipsec.h" 71 #include "opt_pim.h" 72 #include "opt_gateway.h" 73 74 #include <sys/param.h> 75 #include <sys/socket.h> 76 #include <sys/protosw.h> 77 #include <sys/domain.h> 78 #include <sys/mbuf.h> 79 80 #include <net/if.h> 81 #include <net/radix.h> 82 #include <net/route.h> 83 84 #include <netinet/in.h> 85 #include <netinet/in_systm.h> 86 #include <netinet/ip.h> 87 #include <netinet/ip_var.h> 88 #include <netinet/ip_icmp.h> 89 #include <netinet/in_ifattach.h> 90 #include <netinet/in_pcb.h> 91 #include <netinet/in_proto.h> 92 93 #ifdef INET6 94 #ifndef INET 95 #include <netinet/in.h> 96 #endif 97 #include <netinet/ip6.h> 98 #endif 99 100 #include <netinet/igmp_var.h> 101 #ifdef PIM 102 #include <netinet/pim_var.h> 103 #endif 104 #include <netinet/tcp.h> 105 #include <netinet/tcp_fsm.h> 106 #include <netinet/tcp_seq.h> 107 #include <netinet/tcp_timer.h> 108 #include <netinet/tcp_var.h> 109 #include <netinet/tcpip.h> 110 #include <netinet/tcp_debug.h> 111 #include <netinet/udp.h> 112 #include <netinet/udp_var.h> 113 #include <netinet/ip_encap.h> 114 115 /* 116 * TCP/IP protocol family: IP, ICMP, UDP, TCP. 117 */ 118 119 #ifdef FAST_IPSEC 120 #include <netipsec/ipsec.h> 121 #include <netipsec/key.h> 122 #endif /* FAST_IPSEC */ 123 124 #ifdef TPIP 125 #include <netiso/tp_param.h> 126 #include <netiso/tp_var.h> 127 #endif /* TPIP */ 128 129 #ifdef EON 130 #include <netiso/eonvar.h> 131 #endif /* EON */ 132 133 #include "carp.h" 134 #if NCARP > 0 135 #include <netinet/ip_carp.h> 136 #endif 137 138 #include "pfsync.h" 139 #if NPFSYNC > 0 140 #include <net/pfvar.h> 141 #include <net/if_pfsync.h> 142 #endif 143 144 #include "etherip.h" 145 #if NETHERIP > 0 146 #include <netinet/ip_etherip.h> 147 #endif 148 149 DOMAIN_DEFINE(inetdomain); /* forward declare and add to link set */ 150 151 /* Wrappers to acquire kernel_lock. */ 152 153 PR_WRAP_USRREQ(rip_usrreq) 154 PR_WRAP_USRREQ(udp_usrreq) 155 PR_WRAP_USRREQ(tcp_usrreq) 156 157 #define rip_usrreq rip_usrreq_wrapper 158 #define udp_usrreq udp_usrreq_wrapper 159 #define tcp_usrreq tcp_usrreq_wrapper 160 161 PR_WRAP_CTLINPUT(rip_ctlinput) 162 PR_WRAP_CTLINPUT(udp_ctlinput) 163 PR_WRAP_CTLINPUT(tcp_ctlinput) 164 165 #define rip_ctlinput rip_ctlinput_wrapper 166 #define udp_ctlinput udp_ctlinput_wrapper 167 #define tcp_ctlinput tcp_ctlinput_wrapper 168 169 PR_WRAP_CTLOUTPUT(rip_ctloutput) 170 PR_WRAP_CTLOUTPUT(udp_ctloutput) 171 PR_WRAP_CTLOUTPUT(tcp_ctloutput) 172 173 #define rip_ctloutput rip_ctloutput_wrapper 174 #define udp_ctloutput udp_ctloutput_wrapper 175 #define tcp_ctloutput tcp_ctloutput_wrapper 176 177 #if defined(FAST_IPSEC) 178 PR_WRAP_CTLINPUT(ah4_ctlinput) 179 180 #define ah4_ctlinput ah4_ctlinput_wrapper 181 #endif 182 183 #if defined(IPSEC_ESP) || defined(FAST_IPSEC) 184 PR_WRAP_CTLINPUT(esp4_ctlinput) 185 186 #define esp4_ctlinput esp4_ctlinput_wrapper 187 #endif 188 189 #ifdef TPIP 190 PR_WRAP_CTLOUTPUT(tp_ctloutput) 191 192 #define tp_ctloutput tp_ctloutput_wrapper 193 194 PR_WRAP_CTLINPUT(tpip_ctlinput) 195 196 #define tpip_ctlinput tpip_ctlinput_wrapper 197 #endif 198 199 #ifdef EON 200 PR_WRAP_CTLINPUT(eonctlinput) 201 202 #define eonctlinput eonctlinput_wrapper 203 #endif 204 205 const struct protosw inetsw[] = { 206 { .pr_domain = &inetdomain, 207 .pr_init = ip_init, 208 .pr_output = ip_output, 209 .pr_fasttimo = ip_fasttimo, 210 .pr_slowtimo = ip_slowtimo, 211 .pr_drain = ip_drainstub, 212 }, 213 { .pr_type = SOCK_DGRAM, 214 .pr_domain = &inetdomain, 215 .pr_protocol = IPPROTO_UDP, 216 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 217 .pr_input = udp_input, 218 .pr_ctlinput = udp_ctlinput, 219 .pr_ctloutput = udp_ctloutput, 220 .pr_usrreq = udp_usrreq, 221 .pr_init = udp_init, 222 }, 223 { .pr_type = SOCK_STREAM, 224 .pr_domain = &inetdomain, 225 .pr_protocol = IPPROTO_TCP, 226 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS|PR_PURGEIF, 227 .pr_input = tcp_input, 228 .pr_ctlinput = tcp_ctlinput, 229 .pr_ctloutput = tcp_ctloutput, 230 .pr_usrreq = tcp_usrreq, 231 .pr_init = tcp_init, 232 .pr_fasttimo = tcp_fasttimo, 233 .pr_slowtimo = tcp_slowtimo, 234 .pr_drain = tcp_drainstub, 235 }, 236 { .pr_type = SOCK_RAW, 237 .pr_domain = &inetdomain, 238 .pr_protocol = IPPROTO_RAW, 239 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 240 .pr_input = rip_input, 241 .pr_output = rip_output, 242 .pr_ctlinput = rip_ctlinput, 243 .pr_ctloutput = rip_ctloutput, 244 .pr_usrreq = rip_usrreq, 245 }, 246 { .pr_type = SOCK_RAW, 247 .pr_domain = &inetdomain, 248 .pr_protocol = IPPROTO_ICMP, 249 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 250 .pr_input = icmp_input, 251 .pr_output = rip_output, 252 .pr_ctlinput = rip_ctlinput, 253 .pr_ctloutput = rip_ctloutput, 254 .pr_usrreq = rip_usrreq, 255 .pr_init = icmp_init, 256 }, 257 #ifdef GATEWAY 258 { .pr_domain = &inetdomain, 259 .pr_protocol = IPPROTO_IP, 260 .pr_slowtimo = ipflow_slowtimo, 261 .pr_init = ipflow_poolinit, 262 }, 263 #endif /* GATEWAY */ 264 #ifdef FAST_IPSEC 265 { .pr_type = SOCK_RAW, 266 .pr_domain = &inetdomain, 267 .pr_protocol = IPPROTO_AH, 268 .pr_flags = PR_ATOMIC|PR_ADDR, 269 .pr_input = ipsec4_common_input, 270 .pr_ctlinput = ah4_ctlinput, 271 }, 272 { .pr_type = SOCK_RAW, 273 .pr_domain = &inetdomain, 274 .pr_protocol = IPPROTO_ESP, 275 .pr_flags = PR_ATOMIC|PR_ADDR, 276 .pr_input = ipsec4_common_input, 277 .pr_ctlinput = esp4_ctlinput, 278 }, 279 { .pr_type = SOCK_RAW, 280 .pr_domain = &inetdomain, 281 .pr_protocol = IPPROTO_IPCOMP, 282 .pr_flags = PR_ATOMIC|PR_ADDR, 283 .pr_input = ipsec4_common_input, 284 }, 285 #endif /* FAST_IPSEC */ 286 { .pr_type = SOCK_RAW, 287 .pr_domain = &inetdomain, 288 .pr_protocol = IPPROTO_IPV4, 289 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 290 .pr_input = encap4_input, 291 .pr_output = rip_output, 292 .pr_ctlinput = rip_ctlinput, 293 .pr_ctloutput = rip_ctloutput, 294 .pr_usrreq = rip_usrreq, 295 .pr_init = encap_init, 296 }, 297 #ifdef INET6 298 { .pr_type = SOCK_RAW, 299 .pr_domain = &inetdomain, 300 .pr_protocol = IPPROTO_IPV6, 301 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 302 .pr_input = encap4_input, 303 .pr_output = rip_output, 304 .pr_ctlinput = rip_ctlinput, 305 .pr_ctloutput = rip_ctloutput, 306 .pr_usrreq = rip_usrreq, 307 .pr_init = encap_init, 308 }, 309 #endif /* INET6 */ 310 #if NETHERIP > 0 311 { .pr_type = SOCK_RAW, 312 .pr_domain = &inetdomain, 313 .pr_protocol = IPPROTO_ETHERIP, 314 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 315 .pr_input = ip_etherip_input, 316 .pr_output = rip_output, 317 .pr_ctlinput = rip_ctlinput, 318 .pr_ctloutput = rip_ctloutput, 319 .pr_usrreq = rip_usrreq, 320 }, 321 #endif /* NETHERIP > 0 */ 322 #if NCARP > 0 323 { .pr_type = SOCK_RAW, 324 .pr_domain = &inetdomain, 325 .pr_protocol = IPPROTO_CARP, 326 .pr_flags = PR_ATOMIC|PR_ADDR, 327 .pr_input = carp_proto_input, 328 .pr_output = rip_output, 329 .pr_ctloutput = rip_ctloutput, 330 .pr_usrreq = rip_usrreq, 331 .pr_init = carp_init, 332 }, 333 #endif /* NCARP > 0 */ 334 #if NPFSYNC > 0 335 { .pr_type = SOCK_RAW, 336 .pr_domain = &inetdomain, 337 .pr_protocol = IPPROTO_PFSYNC, 338 .pr_flags = PR_ATOMIC|PR_ADDR, 339 .pr_input = pfsync_input, 340 .pr_output = rip_output, 341 .pr_ctloutput = rip_ctloutput, 342 .pr_usrreq = rip_usrreq, 343 }, 344 #endif /* NPFSYNC > 0 */ 345 { .pr_type = SOCK_RAW, 346 .pr_domain = &inetdomain, 347 .pr_protocol = IPPROTO_IGMP, 348 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 349 .pr_input = igmp_input, 350 .pr_output = rip_output, 351 .pr_ctloutput = rip_ctloutput, 352 .pr_ctlinput = rip_ctlinput, 353 .pr_usrreq = rip_usrreq, 354 .pr_fasttimo = igmp_fasttimo, 355 .pr_slowtimo = igmp_slowtimo, 356 .pr_init = igmp_init, 357 }, 358 #ifdef PIM 359 { .pr_type = SOCK_RAW, 360 .pr_domain = &inetdomain, 361 .pr_protocol = IPPROTO_PIM, 362 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 363 .pr_input = pim_input, 364 .pr_output = rip_output, 365 .pr_ctloutput = rip_ctloutput, 366 .pr_ctlinput = rip_ctlinput, 367 .pr_usrreq = rip_usrreq, 368 }, 369 #endif /* PIM */ 370 #ifdef TPIP 371 { .pr_type = SOCK_SEQPACKET, 372 .pr_domain = &inetdomain, 373 .pr_protocol = IPPROTO_TP, 374 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_LASTHDR|PR_ABRTACPTDIS, 375 .pr_input = tpip_input, 376 .pr_ctloutput = tp_ctloutput, 377 .pr_ctlinput = tpip_ctlinput, 378 .pr_usrreq = tp_usrreq, 379 .pr_init = tp_init, 380 .pr_slowtimo = tp_slowtimo, 381 .pr_drain = tp_drain, 382 }, 383 #endif /* TPIP */ 384 #ifdef ISO 385 /* EON (ISO CLNL over IP) */ 386 #ifdef EON 387 { .pr_type = SOCK_RAW, 388 .pr_domain = &inetdomain, 389 .pr_protocol = IPPROTO_EON, 390 .pr_flags = PR_LASTHDR, 391 .pr_input = eoninput, 392 .pr_ctlinput = eonctlinput, 393 .pr_init = eonprotoinit, 394 }, 395 #else 396 { .pr_type = SOCK_RAW, 397 .pr_domain = &inetdomain, 398 .pr_protocol = IPPROTO_EON, 399 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 400 .pr_input = encap4_input, 401 .pr_output = rip_output, 402 .pr_ctloutput = rip_ctloutput, 403 .pr_ctlinput = rip_ctlinput, 404 .pr_usrreq = rip_usrreq, 405 .pr_init = encap_init, 406 }, 407 #endif /* EON */ 408 #endif /* ISO */ 409 /* raw wildcard */ 410 { .pr_type = SOCK_RAW, 411 .pr_domain = &inetdomain, 412 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 413 .pr_input = rip_input, 414 .pr_output = rip_output, 415 .pr_ctloutput = rip_ctloutput, 416 .pr_ctlinput = rip_ctlinput, 417 .pr_usrreq = rip_usrreq, 418 .pr_init = rip_init, 419 }, 420 }; 421 422 extern struct ifqueue ipintrq; 423 424 const struct sockaddr_in in_any = { 425 .sin_len = sizeof(struct sockaddr_in) 426 , .sin_family = AF_INET 427 , .sin_port = 0 428 , .sin_addr = {.s_addr = 0 /* INADDR_ANY */} 429 }; 430 431 struct domain inetdomain = { 432 .dom_family = PF_INET, .dom_name = "internet", .dom_init = NULL, 433 .dom_externalize = NULL, .dom_dispose = NULL, 434 .dom_protosw = inetsw, 435 .dom_protoswNPROTOSW = &inetsw[__arraycount(inetsw)], 436 .dom_rtattach = rt_inithead, 437 .dom_rtoffset = 32, 438 .dom_maxrtkey = sizeof(struct ip_pack4), 439 #ifdef IPSELSRC 440 .dom_ifattach = in_domifattach, 441 .dom_ifdetach = in_domifdetach, 442 #else 443 .dom_ifattach = NULL, 444 .dom_ifdetach = NULL, 445 #endif 446 .dom_ifqueues = { &ipintrq, NULL }, 447 .dom_link = { NULL }, 448 .dom_mowner = MOWNER_INIT("",""), 449 .dom_sa_cmpofs = offsetof(struct sockaddr_in, sin_addr), 450 .dom_sa_cmplen = sizeof(struct in_addr), 451 .dom_sa_any = (const struct sockaddr *)&in_any, 452 .dom_sockaddr_const_addr = sockaddr_in_const_addr, 453 .dom_sockaddr_addr = sockaddr_in_addr, 454 .dom_rtcache = LIST_HEAD_INITIALIZER(inetdomain.dom_rtcache) 455 }; 456 457 u_char ip_protox[IPPROTO_MAX]; 458 459 int icmperrppslim = 100; /* 100pps */ 460 461 static void 462 sockaddr_in_addrlen(const struct sockaddr *sa, socklen_t *slenp) 463 { 464 socklen_t slen; 465 466 if (slenp == NULL) 467 return; 468 469 slen = sockaddr_getlen(sa); 470 *slenp = (socklen_t)MIN(sizeof(struct in_addr), 471 slen - MIN(slen, offsetof(struct sockaddr_in, sin_addr))); 472 } 473 474 const void * 475 sockaddr_in_const_addr(const struct sockaddr *sa, socklen_t *slenp) 476 { 477 const struct sockaddr_in *sin; 478 479 sockaddr_in_addrlen(sa, slenp); 480 sin = (const struct sockaddr_in *)sa; 481 return &sin->sin_addr; 482 } 483 484 void * 485 sockaddr_in_addr(struct sockaddr *sa, socklen_t *slenp) 486 { 487 struct sockaddr_in *sin; 488 489 sockaddr_in_addrlen(sa, slenp); 490 sin = (struct sockaddr_in *)sa; 491 return &sin->sin_addr; 492 } 493 494 int 495 sockaddr_in_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2) 496 { 497 uint_fast8_t len; 498 const uint_fast8_t addrofs = offsetof(struct sockaddr_in, sin_addr), 499 addrend = addrofs + sizeof(struct in_addr); 500 int rc; 501 const struct sockaddr_in *sin1, *sin2; 502 503 sin1 = satocsin(sa1); 504 sin2 = satocsin(sa2); 505 506 len = MIN(addrend, MIN(sin1->sin_len, sin2->sin_len)); 507 508 if (len > addrofs && 509 (rc = memcmp(&sin1->sin_addr, &sin2->sin_addr, 510 len - addrofs)) != 0) 511 return rc; 512 513 return sin1->sin_len - sin2->sin_len; 514 } 515