1 /* $NetBSD: in_proto.c,v 1.118 2016/01/21 15:41:30 riastradh 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 1.118 2016/01/21 15:41:30 riastradh Exp $"); 65 66 #ifdef _KERNEL_OPT 67 #include "opt_mrouting.h" 68 #include "opt_inet.h" 69 #include "opt_ipsec.h" 70 #include "opt_pim.h" 71 #include "opt_gateway.h" 72 #include "opt_dccp.h" 73 #include "opt_sctp.h" 74 #include "opt_compat_netbsd.h" 75 #endif 76 77 #include <sys/param.h> 78 #include <sys/socket.h> 79 #include <sys/protosw.h> 80 #include <sys/domain.h> 81 #include <sys/mbuf.h> 82 83 #include <net/if.h> 84 #include <net/radix.h> 85 #include <net/route.h> 86 87 #include <netinet/in.h> 88 #include <netinet/in_systm.h> 89 #include <netinet/in_var.h> 90 #include <netinet/ip.h> 91 #include <netinet/ip_var.h> 92 #include <netinet/ip_icmp.h> 93 #include <netinet/in_ifattach.h> 94 #include <netinet/in_pcb.h> 95 #include <netinet/in_proto.h> 96 97 #ifdef INET6 98 #ifndef INET 99 #include <netinet/in.h> 100 #endif 101 #include <netinet/ip6.h> 102 #endif 103 104 #include <netinet/igmp_var.h> 105 #ifdef PIM 106 #include <netinet/pim_var.h> 107 #endif 108 #include <netinet/tcp.h> 109 #include <netinet/tcp_fsm.h> 110 #include <netinet/tcp_seq.h> 111 #include <netinet/tcp_timer.h> 112 #include <netinet/tcp_var.h> 113 #include <netinet/tcpip.h> 114 #include <netinet/tcp_debug.h> 115 #include <netinet/udp.h> 116 #include <netinet/udp_var.h> 117 #include <netinet/ip_encap.h> 118 119 #ifdef DCCP 120 #include <netinet/dccp.h> 121 #include <netinet/dccp_var.h> 122 #endif 123 124 #ifdef SCTP 125 #include <netinet/sctp.h> 126 #include <netinet/sctp_var.h> 127 #endif 128 129 /* 130 * TCP/IP protocol family: IP, ICMP, UDP, TCP. 131 */ 132 133 #ifdef IPSEC 134 #include <netipsec/ipsec.h> 135 #include <netipsec/key.h> 136 #endif /* IPSEC */ 137 138 #include "carp.h" 139 #if NCARP > 0 140 #include <netinet/ip_carp.h> 141 #endif 142 143 #include "pfsync.h" 144 #if NPFSYNC > 0 145 #include <net/pfvar.h> 146 #include <net/if_pfsync.h> 147 #endif 148 149 #include "etherip.h" 150 #if NETHERIP > 0 151 #include <netinet/ip_etherip.h> 152 #endif 153 154 DOMAIN_DEFINE(inetdomain); /* forward declare and add to link set */ 155 156 /* Wrappers to acquire kernel_lock. */ 157 158 PR_WRAP_CTLINPUT(rip_ctlinput) 159 PR_WRAP_CTLINPUT(udp_ctlinput) 160 PR_WRAP_CTLINPUT(tcp_ctlinput) 161 162 #define rip_ctlinput rip_ctlinput_wrapper 163 #define udp_ctlinput udp_ctlinput_wrapper 164 #define tcp_ctlinput tcp_ctlinput_wrapper 165 166 PR_WRAP_CTLOUTPUT(rip_ctloutput) 167 PR_WRAP_CTLOUTPUT(udp_ctloutput) 168 PR_WRAP_CTLOUTPUT(tcp_ctloutput) 169 170 #define rip_ctloutput rip_ctloutput_wrapper 171 #define udp_ctloutput udp_ctloutput_wrapper 172 #define tcp_ctloutput tcp_ctloutput_wrapper 173 174 #ifdef DCCP 175 PR_WRAP_CTLINPUT(dccp_ctlinput) 176 PR_WRAP_CTLOUTPUT(dccp_ctloutput) 177 178 #define dccp_ctlinput dccp_ctlinput_wrapper 179 #define dccp_ctloutput dccp_ctloutput_wrapper 180 #endif 181 182 #ifdef SCTP 183 PR_WRAP_CTLINPUT(sctp_ctlinput) 184 PR_WRAP_CTLOUTPUT(sctp_ctloutput) 185 186 #define sctp_ctlinput sctp_ctlinput_wrapper 187 #define sctp_ctloutput sctp_ctloutput_wrapper 188 #endif 189 190 #if defined(IPSEC) 191 PR_WRAP_CTLINPUT(ah4_ctlinput) 192 193 #define ah4_ctlinput ah4_ctlinput_wrapper 194 PR_WRAP_CTLINPUT(esp4_ctlinput) 195 196 #define esp4_ctlinput esp4_ctlinput_wrapper 197 #endif 198 199 const struct protosw inetsw[] = { 200 { .pr_domain = &inetdomain, 201 .pr_init = ip_init, 202 .pr_fasttimo = ip_fasttimo, 203 .pr_slowtimo = ip_slowtimo, 204 .pr_drain = ip_drainstub, 205 }, 206 { .pr_type = SOCK_DGRAM, 207 .pr_domain = &inetdomain, 208 .pr_protocol = IPPROTO_UDP, 209 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 210 .pr_input = udp_input, 211 .pr_ctlinput = udp_ctlinput, 212 .pr_ctloutput = udp_ctloutput, 213 .pr_usrreqs = &udp_usrreqs, 214 .pr_init = udp_init, 215 }, 216 { .pr_type = SOCK_STREAM, 217 .pr_domain = &inetdomain, 218 .pr_protocol = IPPROTO_TCP, 219 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS|PR_PURGEIF, 220 .pr_input = tcp_input, 221 .pr_ctlinput = tcp_ctlinput, 222 .pr_ctloutput = tcp_ctloutput, 223 .pr_usrreqs = &tcp_usrreqs, 224 .pr_init = tcp_init, 225 .pr_fasttimo = tcp_fasttimo, 226 .pr_drain = tcp_drainstub, 227 }, 228 #ifdef DCCP 229 { .pr_type = SOCK_CONN_DGRAM, 230 .pr_domain = &inetdomain, 231 .pr_protocol = IPPROTO_DCCP, 232 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_ATOMIC|PR_LISTEN|PR_ABRTACPTDIS, 233 .pr_input = dccp_input, 234 .pr_ctlinput = dccp_ctlinput, 235 .pr_ctloutput = dccp_ctloutput, 236 .pr_usrreqs = &dccp_usrreqs, 237 .pr_init = dccp_init, 238 }, 239 #endif 240 #ifdef SCTP 241 { .pr_type = SOCK_DGRAM, 242 .pr_domain = &inetdomain, 243 .pr_protocol = IPPROTO_SCTP, 244 .pr_flags = PR_ADDR_OPT|PR_WANTRCVD, 245 .pr_input = sctp_input, 246 .pr_ctlinput = sctp_ctlinput, 247 .pr_ctloutput = sctp_ctloutput, 248 .pr_usrreqs = &sctp_usrreqs, 249 .pr_init = sctp_init, 250 .pr_drain = sctp_drain 251 }, 252 { .pr_type = SOCK_SEQPACKET, 253 .pr_domain = &inetdomain, 254 .pr_protocol = IPPROTO_SCTP, 255 .pr_flags = PR_ADDR_OPT|PR_WANTRCVD, 256 .pr_input = sctp_input, 257 .pr_ctlinput = sctp_ctlinput, 258 .pr_ctloutput = sctp_ctloutput, 259 .pr_usrreqs = &sctp_usrreqs, 260 .pr_drain = sctp_drain 261 }, 262 { .pr_type = SOCK_STREAM, 263 .pr_domain = &inetdomain, 264 .pr_protocol = IPPROTO_SCTP, 265 .pr_flags = PR_CONNREQUIRED|PR_ADDR_OPT|PR_WANTRCVD|PR_LISTEN, 266 .pr_input = sctp_input, 267 .pr_ctlinput = sctp_ctlinput, 268 .pr_ctloutput = sctp_ctloutput, 269 .pr_usrreqs = &sctp_usrreqs, 270 .pr_drain = sctp_drain 271 }, 272 #endif /* SCTP */ 273 { .pr_type = SOCK_RAW, 274 .pr_domain = &inetdomain, 275 .pr_protocol = IPPROTO_RAW, 276 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 277 .pr_input = rip_input, 278 .pr_ctlinput = rip_ctlinput, 279 .pr_ctloutput = rip_ctloutput, 280 .pr_usrreqs = &rip_usrreqs, 281 }, 282 { .pr_type = SOCK_RAW, 283 .pr_domain = &inetdomain, 284 .pr_protocol = IPPROTO_ICMP, 285 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 286 .pr_input = icmp_input, 287 .pr_ctlinput = rip_ctlinput, 288 .pr_ctloutput = rip_ctloutput, 289 .pr_usrreqs = &rip_usrreqs, 290 .pr_init = icmp_init, 291 }, 292 #ifdef GATEWAY 293 { .pr_domain = &inetdomain, 294 .pr_protocol = IPPROTO_IP, 295 .pr_slowtimo = ipflow_slowtimo, 296 .pr_init = ipflow_poolinit, 297 }, 298 #endif /* GATEWAY */ 299 #ifdef IPSEC 300 { .pr_type = SOCK_RAW, 301 .pr_domain = &inetdomain, 302 .pr_protocol = IPPROTO_AH, 303 .pr_flags = PR_ATOMIC|PR_ADDR, 304 .pr_input = ipsec4_common_input, 305 .pr_ctlinput = ah4_ctlinput, 306 }, 307 { .pr_type = SOCK_RAW, 308 .pr_domain = &inetdomain, 309 .pr_protocol = IPPROTO_ESP, 310 .pr_flags = PR_ATOMIC|PR_ADDR, 311 .pr_input = ipsec4_common_input, 312 .pr_ctlinput = esp4_ctlinput, 313 }, 314 { .pr_type = SOCK_RAW, 315 .pr_domain = &inetdomain, 316 .pr_protocol = IPPROTO_IPCOMP, 317 .pr_flags = PR_ATOMIC|PR_ADDR, 318 .pr_input = ipsec4_common_input, 319 }, 320 #endif /* IPSEC */ 321 { .pr_type = SOCK_RAW, 322 .pr_domain = &inetdomain, 323 .pr_protocol = IPPROTO_IPV4, 324 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 325 .pr_input = encap4_input, 326 .pr_ctlinput = rip_ctlinput, 327 .pr_ctloutput = rip_ctloutput, 328 .pr_usrreqs = &rip_usrreqs, 329 .pr_init = encap_init, 330 }, 331 #ifdef INET6 332 { .pr_type = SOCK_RAW, 333 .pr_domain = &inetdomain, 334 .pr_protocol = IPPROTO_IPV6, 335 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 336 .pr_input = encap4_input, 337 .pr_ctlinput = rip_ctlinput, 338 .pr_ctloutput = rip_ctloutput, 339 .pr_usrreqs = &rip_usrreqs, 340 .pr_init = encap_init, 341 }, 342 #endif /* INET6 */ 343 #if NETHERIP > 0 344 { .pr_type = SOCK_RAW, 345 .pr_domain = &inetdomain, 346 .pr_protocol = IPPROTO_ETHERIP, 347 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 348 .pr_input = ip_etherip_input, 349 .pr_ctlinput = rip_ctlinput, 350 .pr_ctloutput = rip_ctloutput, 351 .pr_usrreqs = &rip_usrreqs, 352 }, 353 #endif /* NETHERIP > 0 */ 354 #if NCARP > 0 355 { .pr_type = SOCK_RAW, 356 .pr_domain = &inetdomain, 357 .pr_protocol = IPPROTO_CARP, 358 .pr_flags = PR_ATOMIC|PR_ADDR, 359 .pr_input = carp_proto_input, 360 .pr_ctloutput = rip_ctloutput, 361 .pr_usrreqs = &rip_usrreqs, 362 .pr_init = carp_init, 363 }, 364 #endif /* NCARP > 0 */ 365 #if NPFSYNC > 0 366 { .pr_type = SOCK_RAW, 367 .pr_domain = &inetdomain, 368 .pr_protocol = IPPROTO_PFSYNC, 369 .pr_flags = PR_ATOMIC|PR_ADDR, 370 .pr_input = pfsync_input, 371 .pr_ctloutput = rip_ctloutput, 372 .pr_usrreqs = &rip_usrreqs, 373 }, 374 #endif /* NPFSYNC > 0 */ 375 { .pr_type = SOCK_RAW, 376 .pr_domain = &inetdomain, 377 .pr_protocol = IPPROTO_IGMP, 378 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 379 .pr_input = igmp_input, 380 .pr_ctloutput = rip_ctloutput, 381 .pr_ctlinput = rip_ctlinput, 382 .pr_usrreqs = &rip_usrreqs, 383 .pr_fasttimo = igmp_fasttimo, 384 .pr_slowtimo = igmp_slowtimo, 385 .pr_init = igmp_init, 386 }, 387 #ifdef PIM 388 { .pr_type = SOCK_RAW, 389 .pr_domain = &inetdomain, 390 .pr_protocol = IPPROTO_PIM, 391 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 392 .pr_input = pim_input, 393 .pr_ctloutput = rip_ctloutput, 394 .pr_ctlinput = rip_ctlinput, 395 .pr_usrreqs = &rip_usrreqs, 396 }, 397 #endif /* PIM */ 398 /* raw wildcard */ 399 { .pr_type = SOCK_RAW, 400 .pr_domain = &inetdomain, 401 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 402 .pr_input = rip_input, 403 .pr_ctloutput = rip_ctloutput, 404 .pr_ctlinput = rip_ctlinput, 405 .pr_usrreqs = &rip_usrreqs, 406 .pr_init = rip_init, 407 }, 408 }; 409 410 const struct sockaddr_in in_any = { 411 .sin_len = sizeof(struct sockaddr_in) 412 , .sin_family = AF_INET 413 , .sin_port = 0 414 , .sin_addr = {.s_addr = 0 /* INADDR_ANY */} 415 }; 416 417 struct domain inetdomain = { 418 .dom_family = PF_INET, .dom_name = "internet", .dom_init = NULL, 419 .dom_externalize = NULL, .dom_dispose = NULL, 420 .dom_protosw = inetsw, 421 .dom_protoswNPROTOSW = &inetsw[__arraycount(inetsw)], 422 .dom_rtattach = rt_inithead, 423 .dom_rtoffset = 32, 424 .dom_maxrtkey = sizeof(struct ip_pack4), 425 .dom_if_up = in_if_up, 426 .dom_if_down = in_if_down, 427 .dom_ifattach = in_domifattach, 428 .dom_ifdetach = in_domifdetach, 429 .dom_if_link_state_change = in_if_link_state_change, 430 .dom_ifqueues = { NULL, NULL }, 431 .dom_link = { NULL }, 432 .dom_mowner = MOWNER_INIT("",""), 433 .dom_sa_cmpofs = offsetof(struct sockaddr_in, sin_addr), 434 .dom_sa_cmplen = sizeof(struct in_addr), 435 .dom_sa_any = (const struct sockaddr *)&in_any, 436 .dom_sockaddr_const_addr = sockaddr_in_const_addr, 437 .dom_sockaddr_addr = sockaddr_in_addr, 438 .dom_rtcache = LIST_HEAD_INITIALIZER(inetdomain.dom_rtcache) 439 }; 440 441 u_char ip_protox[IPPROTO_MAX]; 442 443 int icmperrppslim = 100; /* 100pps */ 444 445 static void 446 sockaddr_in_addrlen(const struct sockaddr *sa, socklen_t *slenp) 447 { 448 socklen_t slen; 449 450 if (slenp == NULL) 451 return; 452 453 slen = sockaddr_getlen(sa); 454 *slenp = (socklen_t)MIN(sizeof(struct in_addr), 455 slen - MIN(slen, offsetof(struct sockaddr_in, sin_addr))); 456 } 457 458 const void * 459 sockaddr_in_const_addr(const struct sockaddr *sa, socklen_t *slenp) 460 { 461 const struct sockaddr_in *sin; 462 463 sockaddr_in_addrlen(sa, slenp); 464 sin = (const struct sockaddr_in *)sa; 465 return &sin->sin_addr; 466 } 467 468 void * 469 sockaddr_in_addr(struct sockaddr *sa, socklen_t *slenp) 470 { 471 struct sockaddr_in *sin; 472 473 sockaddr_in_addrlen(sa, slenp); 474 sin = (struct sockaddr_in *)sa; 475 return &sin->sin_addr; 476 } 477 478 int 479 sockaddr_in_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2) 480 { 481 uint_fast8_t len; 482 const uint_fast8_t addrofs = offsetof(struct sockaddr_in, sin_addr), 483 addrend = addrofs + sizeof(struct in_addr); 484 int rc; 485 const struct sockaddr_in *sin1, *sin2; 486 487 sin1 = satocsin(sa1); 488 sin2 = satocsin(sa2); 489 490 len = MIN(addrend, MIN(sin1->sin_len, sin2->sin_len)); 491 492 if (len > addrofs && 493 (rc = memcmp(&sin1->sin_addr, &sin2->sin_addr, 494 len - addrofs)) != 0) 495 return rc; 496 497 return sin1->sin_len - sin2->sin_len; 498 } 499