1 /* $NetBSD: in_proto.c,v 1.107 2014/01/02 18:29:01 pooka 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 1.107 2014/01/02 18:29:01 pooka Exp $"); 65 66 #include "opt_mrouting.h" 67 #include "opt_inet.h" 68 #include "opt_ipsec.h" 69 #include "opt_pim.h" 70 #include "opt_gateway.h" 71 72 #include <sys/param.h> 73 #include <sys/socket.h> 74 #include <sys/protosw.h> 75 #include <sys/domain.h> 76 #include <sys/mbuf.h> 77 78 #include <net/if.h> 79 #include <net/radix.h> 80 #include <net/route.h> 81 82 #include <netinet/in.h> 83 #include <netinet/in_systm.h> 84 #include <netinet/ip.h> 85 #include <netinet/ip_var.h> 86 #include <netinet/ip_icmp.h> 87 #include <netinet/in_ifattach.h> 88 #include <netinet/in_pcb.h> 89 #include <netinet/in_proto.h> 90 91 #ifdef INET6 92 #ifndef INET 93 #include <netinet/in.h> 94 #endif 95 #include <netinet/ip6.h> 96 #endif 97 98 #include <netinet/igmp_var.h> 99 #ifdef PIM 100 #include <netinet/pim_var.h> 101 #endif 102 #include <netinet/tcp.h> 103 #include <netinet/tcp_fsm.h> 104 #include <netinet/tcp_seq.h> 105 #include <netinet/tcp_timer.h> 106 #include <netinet/tcp_var.h> 107 #include <netinet/tcpip.h> 108 #include <netinet/tcp_debug.h> 109 #include <netinet/udp.h> 110 #include <netinet/udp_var.h> 111 #include <netinet/ip_encap.h> 112 113 /* 114 * TCP/IP protocol family: IP, ICMP, UDP, TCP. 115 */ 116 117 #ifdef IPSEC 118 #include <netipsec/ipsec.h> 119 #include <netipsec/key.h> 120 #endif /* IPSEC */ 121 122 #include "carp.h" 123 #if NCARP > 0 124 #include <netinet/ip_carp.h> 125 #endif 126 127 #include "pfsync.h" 128 #if NPFSYNC > 0 129 #include <net/pfvar.h> 130 #include <net/if_pfsync.h> 131 #endif 132 133 #include "etherip.h" 134 #if NETHERIP > 0 135 #include <netinet/ip_etherip.h> 136 #endif 137 138 DOMAIN_DEFINE(inetdomain); /* forward declare and add to link set */ 139 140 /* Wrappers to acquire kernel_lock. */ 141 142 PR_WRAP_USRREQ(rip_usrreq) 143 PR_WRAP_USRREQ(udp_usrreq) 144 PR_WRAP_USRREQ(tcp_usrreq) 145 146 #define rip_usrreq rip_usrreq_wrapper 147 #define udp_usrreq udp_usrreq_wrapper 148 #define tcp_usrreq tcp_usrreq_wrapper 149 150 PR_WRAP_CTLINPUT(rip_ctlinput) 151 PR_WRAP_CTLINPUT(udp_ctlinput) 152 PR_WRAP_CTLINPUT(tcp_ctlinput) 153 154 #define rip_ctlinput rip_ctlinput_wrapper 155 #define udp_ctlinput udp_ctlinput_wrapper 156 #define tcp_ctlinput tcp_ctlinput_wrapper 157 158 PR_WRAP_CTLOUTPUT(rip_ctloutput) 159 PR_WRAP_CTLOUTPUT(udp_ctloutput) 160 PR_WRAP_CTLOUTPUT(tcp_ctloutput) 161 162 #define rip_ctloutput rip_ctloutput_wrapper 163 #define udp_ctloutput udp_ctloutput_wrapper 164 #define tcp_ctloutput tcp_ctloutput_wrapper 165 166 #if defined(IPSEC) 167 PR_WRAP_CTLINPUT(ah4_ctlinput) 168 169 #define ah4_ctlinput ah4_ctlinput_wrapper 170 PR_WRAP_CTLINPUT(esp4_ctlinput) 171 172 #define esp4_ctlinput esp4_ctlinput_wrapper 173 #endif 174 175 const struct protosw inetsw[] = { 176 { .pr_domain = &inetdomain, 177 .pr_init = ip_init, 178 .pr_output = ip_output, 179 .pr_fasttimo = ip_fasttimo, 180 .pr_slowtimo = ip_slowtimo, 181 .pr_drain = ip_drainstub, 182 }, 183 { .pr_type = SOCK_DGRAM, 184 .pr_domain = &inetdomain, 185 .pr_protocol = IPPROTO_UDP, 186 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 187 .pr_input = udp_input, 188 .pr_ctlinput = udp_ctlinput, 189 .pr_ctloutput = udp_ctloutput, 190 .pr_usrreq = udp_usrreq, 191 .pr_init = udp_init, 192 }, 193 { .pr_type = SOCK_STREAM, 194 .pr_domain = &inetdomain, 195 .pr_protocol = IPPROTO_TCP, 196 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS|PR_PURGEIF, 197 .pr_input = tcp_input, 198 .pr_ctlinput = tcp_ctlinput, 199 .pr_ctloutput = tcp_ctloutput, 200 .pr_usrreq = tcp_usrreq, 201 .pr_init = tcp_init, 202 .pr_fasttimo = tcp_fasttimo, 203 .pr_drain = tcp_drainstub, 204 }, 205 { .pr_type = SOCK_RAW, 206 .pr_domain = &inetdomain, 207 .pr_protocol = IPPROTO_RAW, 208 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 209 .pr_input = rip_input, 210 .pr_output = rip_output, 211 .pr_ctlinput = rip_ctlinput, 212 .pr_ctloutput = rip_ctloutput, 213 .pr_usrreq = rip_usrreq, 214 }, 215 { .pr_type = SOCK_RAW, 216 .pr_domain = &inetdomain, 217 .pr_protocol = IPPROTO_ICMP, 218 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 219 .pr_input = icmp_input, 220 .pr_output = rip_output, 221 .pr_ctlinput = rip_ctlinput, 222 .pr_ctloutput = rip_ctloutput, 223 .pr_usrreq = rip_usrreq, 224 .pr_init = icmp_init, 225 }, 226 #ifdef GATEWAY 227 { .pr_domain = &inetdomain, 228 .pr_protocol = IPPROTO_IP, 229 .pr_slowtimo = ipflow_slowtimo, 230 .pr_init = ipflow_poolinit, 231 }, 232 #endif /* GATEWAY */ 233 #ifdef IPSEC 234 { .pr_type = SOCK_RAW, 235 .pr_domain = &inetdomain, 236 .pr_protocol = IPPROTO_AH, 237 .pr_flags = PR_ATOMIC|PR_ADDR, 238 .pr_input = ipsec4_common_input, 239 .pr_ctlinput = ah4_ctlinput, 240 }, 241 { .pr_type = SOCK_RAW, 242 .pr_domain = &inetdomain, 243 .pr_protocol = IPPROTO_ESP, 244 .pr_flags = PR_ATOMIC|PR_ADDR, 245 .pr_input = ipsec4_common_input, 246 .pr_ctlinput = esp4_ctlinput, 247 }, 248 { .pr_type = SOCK_RAW, 249 .pr_domain = &inetdomain, 250 .pr_protocol = IPPROTO_IPCOMP, 251 .pr_flags = PR_ATOMIC|PR_ADDR, 252 .pr_input = ipsec4_common_input, 253 }, 254 #endif /* IPSEC */ 255 { .pr_type = SOCK_RAW, 256 .pr_domain = &inetdomain, 257 .pr_protocol = IPPROTO_IPV4, 258 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 259 .pr_input = encap4_input, 260 .pr_output = rip_output, 261 .pr_ctlinput = rip_ctlinput, 262 .pr_ctloutput = rip_ctloutput, 263 .pr_usrreq = rip_usrreq, 264 .pr_init = encap_init, 265 }, 266 #ifdef INET6 267 { .pr_type = SOCK_RAW, 268 .pr_domain = &inetdomain, 269 .pr_protocol = IPPROTO_IPV6, 270 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 271 .pr_input = encap4_input, 272 .pr_output = rip_output, 273 .pr_ctlinput = rip_ctlinput, 274 .pr_ctloutput = rip_ctloutput, 275 .pr_usrreq = rip_usrreq, 276 .pr_init = encap_init, 277 }, 278 #endif /* INET6 */ 279 #if NETHERIP > 0 280 { .pr_type = SOCK_RAW, 281 .pr_domain = &inetdomain, 282 .pr_protocol = IPPROTO_ETHERIP, 283 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 284 .pr_input = ip_etherip_input, 285 .pr_output = rip_output, 286 .pr_ctlinput = rip_ctlinput, 287 .pr_ctloutput = rip_ctloutput, 288 .pr_usrreq = rip_usrreq, 289 }, 290 #endif /* NETHERIP > 0 */ 291 #if NCARP > 0 292 { .pr_type = SOCK_RAW, 293 .pr_domain = &inetdomain, 294 .pr_protocol = IPPROTO_CARP, 295 .pr_flags = PR_ATOMIC|PR_ADDR, 296 .pr_input = carp_proto_input, 297 .pr_output = rip_output, 298 .pr_ctloutput = rip_ctloutput, 299 .pr_usrreq = rip_usrreq, 300 .pr_init = carp_init, 301 }, 302 #endif /* NCARP > 0 */ 303 #if NPFSYNC > 0 304 { .pr_type = SOCK_RAW, 305 .pr_domain = &inetdomain, 306 .pr_protocol = IPPROTO_PFSYNC, 307 .pr_flags = PR_ATOMIC|PR_ADDR, 308 .pr_input = pfsync_input, 309 .pr_output = rip_output, 310 .pr_ctloutput = rip_ctloutput, 311 .pr_usrreq = rip_usrreq, 312 }, 313 #endif /* NPFSYNC > 0 */ 314 { .pr_type = SOCK_RAW, 315 .pr_domain = &inetdomain, 316 .pr_protocol = IPPROTO_IGMP, 317 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 318 .pr_input = igmp_input, 319 .pr_output = rip_output, 320 .pr_ctloutput = rip_ctloutput, 321 .pr_ctlinput = rip_ctlinput, 322 .pr_usrreq = rip_usrreq, 323 .pr_fasttimo = igmp_fasttimo, 324 .pr_slowtimo = igmp_slowtimo, 325 .pr_init = igmp_init, 326 }, 327 #ifdef PIM 328 { .pr_type = SOCK_RAW, 329 .pr_domain = &inetdomain, 330 .pr_protocol = IPPROTO_PIM, 331 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 332 .pr_input = pim_input, 333 .pr_output = rip_output, 334 .pr_ctloutput = rip_ctloutput, 335 .pr_ctlinput = rip_ctlinput, 336 .pr_usrreq = rip_usrreq, 337 }, 338 #endif /* PIM */ 339 /* raw wildcard */ 340 { .pr_type = SOCK_RAW, 341 .pr_domain = &inetdomain, 342 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 343 .pr_input = rip_input, 344 .pr_output = rip_output, 345 .pr_ctloutput = rip_ctloutput, 346 .pr_ctlinput = rip_ctlinput, 347 .pr_usrreq = rip_usrreq, 348 .pr_init = rip_init, 349 }, 350 }; 351 352 extern struct ifqueue ipintrq; 353 354 const struct sockaddr_in in_any = { 355 .sin_len = sizeof(struct sockaddr_in) 356 , .sin_family = AF_INET 357 , .sin_port = 0 358 , .sin_addr = {.s_addr = 0 /* INADDR_ANY */} 359 }; 360 361 struct domain inetdomain = { 362 .dom_family = PF_INET, .dom_name = "internet", .dom_init = NULL, 363 .dom_externalize = NULL, .dom_dispose = NULL, 364 .dom_protosw = inetsw, 365 .dom_protoswNPROTOSW = &inetsw[__arraycount(inetsw)], 366 .dom_rtattach = rt_inithead, 367 .dom_rtoffset = 32, 368 .dom_maxrtkey = sizeof(struct ip_pack4), 369 #ifdef IPSELSRC 370 .dom_ifattach = in_domifattach, 371 .dom_ifdetach = in_domifdetach, 372 #else 373 .dom_ifattach = NULL, 374 .dom_ifdetach = NULL, 375 #endif 376 .dom_ifqueues = { &ipintrq, NULL }, 377 .dom_link = { NULL }, 378 .dom_mowner = MOWNER_INIT("",""), 379 .dom_sa_cmpofs = offsetof(struct sockaddr_in, sin_addr), 380 .dom_sa_cmplen = sizeof(struct in_addr), 381 .dom_sa_any = (const struct sockaddr *)&in_any, 382 .dom_sockaddr_const_addr = sockaddr_in_const_addr, 383 .dom_sockaddr_addr = sockaddr_in_addr, 384 .dom_rtcache = LIST_HEAD_INITIALIZER(inetdomain.dom_rtcache) 385 }; 386 387 u_char ip_protox[IPPROTO_MAX]; 388 389 int icmperrppslim = 100; /* 100pps */ 390 391 static void 392 sockaddr_in_addrlen(const struct sockaddr *sa, socklen_t *slenp) 393 { 394 socklen_t slen; 395 396 if (slenp == NULL) 397 return; 398 399 slen = sockaddr_getlen(sa); 400 *slenp = (socklen_t)MIN(sizeof(struct in_addr), 401 slen - MIN(slen, offsetof(struct sockaddr_in, sin_addr))); 402 } 403 404 const void * 405 sockaddr_in_const_addr(const struct sockaddr *sa, socklen_t *slenp) 406 { 407 const struct sockaddr_in *sin; 408 409 sockaddr_in_addrlen(sa, slenp); 410 sin = (const struct sockaddr_in *)sa; 411 return &sin->sin_addr; 412 } 413 414 void * 415 sockaddr_in_addr(struct sockaddr *sa, socklen_t *slenp) 416 { 417 struct sockaddr_in *sin; 418 419 sockaddr_in_addrlen(sa, slenp); 420 sin = (struct sockaddr_in *)sa; 421 return &sin->sin_addr; 422 } 423 424 int 425 sockaddr_in_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2) 426 { 427 uint_fast8_t len; 428 const uint_fast8_t addrofs = offsetof(struct sockaddr_in, sin_addr), 429 addrend = addrofs + sizeof(struct in_addr); 430 int rc; 431 const struct sockaddr_in *sin1, *sin2; 432 433 sin1 = satocsin(sa1); 434 sin2 = satocsin(sa2); 435 436 len = MIN(addrend, MIN(sin1->sin_len, sin2->sin_len)); 437 438 if (len > addrofs && 439 (rc = memcmp(&sin1->sin_addr, &sin2->sin_addr, 440 len - addrofs)) != 0) 441 return rc; 442 443 return sin1->sin_len - sin2->sin_len; 444 } 445