1 /* $NetBSD: in6_proto.c,v 1.91 2011/05/03 17:44:30 dyoung Exp $ */ 2 /* $KAME: in6_proto.c,v 1.66 2000/10/10 15:35:47 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 /* 34 * Copyright (c) 1982, 1986, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)in_proto.c 8.1 (Berkeley) 6/10/93 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: in6_proto.c,v 1.91 2011/05/03 17:44:30 dyoung Exp $"); 66 67 #include "opt_gateway.h" 68 #include "opt_inet.h" 69 #include "opt_ipsec.h" 70 #include "opt_iso.h" 71 72 #include <sys/param.h> 73 #include <sys/socket.h> 74 #include <sys/protosw.h> 75 #include <sys/kernel.h> 76 #include <sys/domain.h> 77 #include <sys/mbuf.h> 78 79 #include <net/if.h> 80 #include <net/radix.h> 81 #include <net/route.h> 82 83 #include <netinet/in.h> 84 #include <netinet/in_systm.h> 85 #include <netinet/in_var.h> 86 #include <netinet/ip_encap.h> 87 #include <netinet/ip.h> 88 #include <netinet/ip_var.h> 89 #include <netinet/in_pcb.h> 90 #include <netinet/ip6.h> 91 #include <netinet6/ip6_var.h> 92 #include <netinet/icmp6.h> 93 #include <netinet6/in6_pcb.h> 94 95 #include <netinet/tcp.h> 96 #include <netinet/tcp_fsm.h> 97 #include <netinet/tcp_seq.h> 98 #include <netinet/tcp_timer.h> 99 #include <netinet/tcp_var.h> 100 #include <netinet/tcpip.h> 101 #include <netinet/tcp_debug.h> 102 103 #include <netinet6/udp6.h> 104 #include <netinet6/udp6_var.h> 105 106 #include <netinet6/pim6_var.h> 107 108 #include <netinet6/nd6.h> 109 110 #ifdef IPSEC 111 #include <netinet6/ipsec.h> 112 #include <netinet6/ah.h> 113 #ifdef IPSEC_ESP 114 #include <netinet6/esp.h> 115 #endif 116 #include <netinet6/ipcomp.h> 117 #endif /* IPSEC */ 118 119 #ifdef FAST_IPSEC 120 #include <netipsec/ipsec.h> 121 #include <netipsec/ipsec6.h> 122 #include <netipsec/key.h> 123 #endif /* FAST_IPSEC */ 124 125 126 #include "carp.h" 127 #if NCARP > 0 128 #include <netinet/ip_carp.h> 129 #endif 130 131 #include "etherip.h" 132 #if NETHERIP > 0 133 #include <netinet6/ip6_etherip.h> 134 #endif 135 136 #include <netinet6/ip6protosw.h> 137 138 #include <net/net_osdep.h> 139 140 #ifndef offsetof /* XXX */ 141 #define offsetof(type, member) ((size_t)(&((type *)0)->member)) 142 #endif 143 144 /* 145 * TCP/IP protocol family: IP6, ICMP6, UDP, TCP. 146 */ 147 148 DOMAIN_DEFINE(inet6domain); /* forward declare and add to link set */ 149 150 /* Wrappers to acquire kernel_lock. */ 151 152 PR_WRAP_USRREQ(rip6_usrreq) 153 PR_WRAP_USRREQ(udp6_usrreq) 154 PR_WRAP_USRREQ(tcp_usrreq) 155 156 #define rip6_usrreq rip6_usrreq_wrapper 157 #define udp6_usrreq udp6_usrreq_wrapper 158 #define tcp_usrreq tcp_usrreq_wrapper 159 160 PR_WRAP_CTLINPUT(rip6_ctlinput) 161 PR_WRAP_CTLINPUT(encap6_ctlinput) 162 PR_WRAP_CTLINPUT(udp6_ctlinput) 163 PR_WRAP_CTLINPUT(tcp6_ctlinput) 164 165 #define rip6_ctlinput rip6_ctlinput_wrapper 166 #define encap6_ctlinput encap6_ctlinput_wrapper 167 #define udp6_ctlinput udp6_ctlinput_wrapper 168 #define tcp6_ctlinput tcp6_ctlinput_wrapper 169 170 PR_WRAP_CTLOUTPUT(rip6_ctloutput) 171 PR_WRAP_CTLOUTPUT(ip6_ctloutput) 172 PR_WRAP_CTLOUTPUT(tcp_ctloutput) 173 PR_WRAP_CTLOUTPUT(icmp6_ctloutput) 174 175 #define rip6_ctloutput rip6_ctloutput_wrapper 176 #define ip6_ctloutput ip6_ctloutput_wrapper 177 #define tcp_ctloutput tcp_ctloutput_wrapper 178 #define icmp6_ctloutput icmp6_ctloutput_wrapper 179 180 #if defined(IPSEC) || defined(FAST_IPSEC) 181 PR_WRAP_CTLINPUT(ah6_ctlinput) 182 183 #define ah6_ctlinput ah6_ctlinput_wrapper 184 #endif 185 186 #if (defined(IPSEC) && defined(IPSEC_ESP)) || defined(FAST_IPSEC) 187 PR_WRAP_CTLINPUT(esp6_ctlinput) 188 189 #define esp6_ctlinput esp6_ctlinput_wrapper 190 #endif 191 192 const struct ip6protosw inet6sw[] = { 193 { .pr_domain = &inet6domain, 194 .pr_protocol = IPPROTO_IPV6, 195 .pr_init = ip6_init, 196 .pr_fasttimo = frag6_fasttimo, 197 .pr_slowtimo = frag6_slowtimo, 198 .pr_drain = frag6_drainstub, 199 }, 200 { .pr_type = SOCK_DGRAM, 201 .pr_domain = &inet6domain, 202 .pr_protocol = IPPROTO_UDP, 203 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 204 .pr_input = udp6_input, 205 .pr_ctlinput = udp6_ctlinput, 206 .pr_ctloutput = ip6_ctloutput, 207 .pr_usrreq = udp6_usrreq, 208 .pr_init = udp6_init, 209 }, 210 { .pr_type = SOCK_STREAM, 211 .pr_domain = &inet6domain, 212 .pr_protocol = IPPROTO_TCP, 213 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS|PR_PURGEIF, 214 .pr_input = tcp6_input, 215 .pr_ctlinput = tcp6_ctlinput, 216 .pr_ctloutput = tcp_ctloutput, 217 .pr_usrreq = tcp_usrreq, 218 #ifndef INET /* don't call initialization and timeout routines twice */ 219 .pr_init = tcp_init, 220 .pr_fasttimo = tcp_fasttimo, 221 .pr_slowtimo = tcp_slowtimo, 222 .pr_drain = tcp_drainstub, 223 #endif 224 }, 225 { .pr_type = SOCK_RAW, 226 .pr_domain = &inet6domain, 227 .pr_protocol = IPPROTO_RAW, 228 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 229 .pr_input = rip6_input, 230 .pr_output = rip6_output, 231 .pr_ctlinput = rip6_ctlinput, 232 .pr_ctloutput = rip6_ctloutput, 233 .pr_usrreq = rip6_usrreq, 234 }, 235 #ifdef GATEWAY 236 { .pr_domain = &inet6domain, 237 .pr_protocol = IPPROTO_IPV6, 238 .pr_slowtimo = ip6flow_slowtimo, 239 .pr_init = ip6flow_poolinit, 240 }, 241 #endif /* GATEWAY */ 242 { .pr_type = SOCK_RAW, 243 .pr_domain = &inet6domain, 244 .pr_protocol = IPPROTO_ICMPV6, 245 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 246 .pr_input = icmp6_input, 247 .pr_output = rip6_output, 248 .pr_ctlinput = rip6_ctlinput, 249 .pr_ctloutput = icmp6_ctloutput, 250 .pr_usrreq = rip6_usrreq, 251 .pr_init = icmp6_init, 252 }, 253 { .pr_type = SOCK_RAW, 254 .pr_domain = &inet6domain, 255 .pr_protocol = IPPROTO_DSTOPTS, 256 .pr_flags = PR_ATOMIC|PR_ADDR, 257 .pr_input = dest6_input, 258 }, 259 { .pr_type = SOCK_RAW, 260 .pr_domain = &inet6domain, 261 .pr_protocol = IPPROTO_ROUTING, 262 .pr_flags = PR_ATOMIC|PR_ADDR, 263 .pr_input = route6_input, 264 }, 265 { .pr_type = SOCK_RAW, 266 .pr_domain = &inet6domain, 267 .pr_protocol = IPPROTO_FRAGMENT, 268 .pr_flags = PR_ATOMIC|PR_ADDR, 269 .pr_input = frag6_input, 270 }, 271 #ifdef IPSEC 272 { .pr_type = SOCK_RAW, 273 .pr_domain = &inet6domain, 274 .pr_protocol = IPPROTO_AH, 275 .pr_flags = PR_ATOMIC|PR_ADDR, 276 .pr_input = ah6_input, 277 .pr_ctlinput = ah6_ctlinput, 278 .pr_init = ah6_init, 279 }, 280 #ifdef IPSEC_ESP 281 { .pr_type = SOCK_RAW, 282 .pr_domain = &inet6domain, 283 .pr_protocol = IPPROTO_ESP, 284 .pr_flags = PR_ATOMIC|PR_ADDR, 285 .pr_input = esp6_input, 286 .pr_ctlinput = esp6_ctlinput, 287 .pr_init = esp6_init, 288 }, 289 #endif 290 { .pr_type = SOCK_RAW, 291 .pr_domain = &inet6domain, 292 .pr_protocol = IPPROTO_IPCOMP, 293 .pr_flags = PR_ATOMIC|PR_ADDR, 294 .pr_input = ipcomp6_input, 295 .pr_init = ipcomp6_init, 296 }, 297 #endif /* IPSEC */ 298 #ifdef FAST_IPSEC 299 { .pr_type = SOCK_RAW, 300 .pr_domain = &inet6domain, 301 .pr_protocol = IPPROTO_AH, 302 .pr_flags = PR_ATOMIC|PR_ADDR, 303 .pr_input = ipsec6_common_input, 304 .pr_ctlinput = ah6_ctlinput, 305 }, 306 { .pr_type = SOCK_RAW, 307 .pr_domain = &inet6domain, 308 .pr_protocol = IPPROTO_ESP, 309 .pr_flags = PR_ATOMIC|PR_ADDR, 310 .pr_input = ipsec6_common_input, 311 .pr_ctlinput = esp6_ctlinput, 312 }, 313 { .pr_type = SOCK_RAW, 314 .pr_domain = &inet6domain, 315 .pr_protocol = IPPROTO_IPCOMP, 316 .pr_flags = PR_ATOMIC|PR_ADDR, 317 .pr_input = ipsec6_common_input, 318 }, 319 #endif /* FAST_IPSEC */ 320 #ifdef INET 321 { .pr_type = SOCK_RAW, 322 .pr_domain = &inet6domain, 323 .pr_protocol = IPPROTO_IPV4, 324 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 325 .pr_input = encap6_input, 326 .pr_output = rip6_output, 327 .pr_ctlinput = encap6_ctlinput, 328 .pr_ctloutput = rip6_ctloutput, 329 .pr_usrreq = rip6_usrreq, 330 .pr_init = encap_init, 331 }, 332 #endif 333 { .pr_type = SOCK_RAW, 334 .pr_domain = &inet6domain, 335 .pr_protocol = IPPROTO_IPV6, 336 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 337 .pr_input = encap6_input, 338 .pr_output = rip6_output, 339 .pr_ctlinput = encap6_ctlinput, 340 .pr_ctloutput = rip6_ctloutput, 341 .pr_usrreq = rip6_usrreq, 342 .pr_init = encap_init, 343 }, 344 #if NETHERIP > 0 345 { .pr_type = SOCK_RAW, 346 .pr_domain = &inet6domain, 347 .pr_protocol = IPPROTO_ETHERIP, 348 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 349 .pr_input = ip6_etherip_input, 350 .pr_output = rip6_output, 351 .pr_ctlinput = rip6_ctlinput, 352 .pr_ctloutput = rip6_ctloutput, 353 .pr_usrreq = rip6_usrreq, 354 }, 355 #endif 356 #if NCARP > 0 357 { .pr_type = SOCK_RAW, 358 .pr_domain = &inet6domain, 359 .pr_protocol = IPPROTO_CARP, 360 .pr_flags = PR_ATOMIC|PR_ADDR, 361 .pr_input = carp6_proto_input, 362 .pr_output = rip6_output, 363 .pr_ctloutput = rip6_ctloutput, 364 .pr_usrreq = rip6_usrreq, 365 }, 366 #endif /* NCARP */ 367 #ifdef ISO 368 { .pr_type = SOCK_RAW, 369 .pr_domain = &inet6domain, 370 .pr_protocol = IPPROTO_EON, 371 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 372 .pr_input = encap6_input, 373 .pr_output = rip6_output, 374 .pr_ctlinput = encap6_ctlinput, 375 .pr_ctloutput = rip6_ctloutput, 376 .pr_usrreq = rip6_usrreq, 377 /*XXX*/ 378 .pr_init = encap_init, 379 }, 380 #endif 381 { .pr_type = SOCK_RAW, 382 .pr_domain = &inet6domain, 383 .pr_protocol = IPPROTO_PIM, 384 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 385 .pr_input = pim6_input, 386 .pr_output = rip6_output, 387 .pr_ctloutput = rip6_ctloutput, 388 .pr_usrreq = rip6_usrreq, 389 .pr_init = pim6_init, 390 }, 391 /* raw wildcard */ 392 { .pr_type = SOCK_RAW, 393 .pr_domain = &inet6domain, 394 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 395 .pr_input = rip6_input, 396 .pr_output = rip6_output, 397 .pr_ctloutput = rip6_ctloutput, 398 .pr_usrreq = rip6_usrreq, 399 .pr_init = rip6_init, 400 }, 401 }; 402 403 static const struct sockaddr_in6 in6_any = { 404 .sin6_len = sizeof(in6_any) 405 , .sin6_family = AF_INET6 406 , .sin6_port = 0 407 , .sin6_flowinfo = 0 408 , .sin6_addr = IN6ADDR_ANY_INIT 409 , .sin6_scope_id = 0 410 }; 411 412 struct domain inet6domain = { 413 .dom_family = AF_INET6, .dom_name = "internet6", 414 .dom_init = NULL, .dom_externalize = NULL, .dom_dispose = NULL, 415 .dom_protosw = (const struct protosw *)inet6sw, 416 .dom_protoswNPROTOSW = (const struct protosw *)&inet6sw[sizeof(inet6sw)/sizeof(inet6sw[0])], 417 .dom_rtattach = rt_inithead, 418 .dom_rtoffset = offsetof(struct sockaddr_in6, sin6_addr) << 3, 419 .dom_maxrtkey = sizeof(struct ip_pack6), 420 .dom_ifattach = in6_domifattach, .dom_ifdetach = in6_domifdetach, 421 .dom_ifqueues = { &ip6intrq, NULL }, 422 .dom_link = { NULL }, 423 .dom_mowner = MOWNER_INIT("",""), 424 .dom_sa_cmpofs = offsetof(struct sockaddr_in6, sin6_addr), 425 .dom_sa_cmplen = sizeof(struct in6_addr), 426 .dom_sa_any = (const struct sockaddr *)&in6_any, 427 .dom_sockaddr_externalize = sockaddr_in6_externalize, 428 .dom_rtcache = LIST_HEAD_INITIALIZER(inet6domain.dom_rtcache) 429 }; 430 431 #if 0 432 int 433 sockaddr_in6_cmp(const struct sockaddr *lsa, const struct sockaddr *rsa) 434 { 435 uint_fast8_t len; 436 const uint_fast8_t addrofs = offsetof(struct sockaddr_in6, sin6_addr), 437 addrend = addrofs + sizeof(struct in6_addr); 438 int rc; 439 const struct sockaddr_in6 *lsin6, *rsin6; 440 441 lsin6 = satocsin6(lsa); 442 rsin6 = satocsin6(rsa); 443 444 len = MIN(addrend, MIN(lsin6->sin6_len, rsin6->sin6_len)); 445 446 if (len > addrofs && 447 (rc = memcmp(&lsin6->sin6_addr, &rsin6->sin6_addr, 448 len - addrofs)) != 0) 449 return rc; 450 451 return lsin6->sin6_len - rsin6->sin6_len; 452 } 453 #endif 454 455 /* 456 * Internet configuration info 457 */ 458 #ifndef IPV6FORWARDING 459 #ifdef GATEWAY6 460 #define IPV6FORWARDING 1 /* forward IP6 packets not for us */ 461 #else 462 #define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */ 463 #endif /* GATEWAY6 */ 464 #endif /* !IPV6FORWARDING */ 465 466 int ip6_forwarding = IPV6FORWARDING; /* act as router? */ 467 int ip6_sendredirects = 1; 468 int ip6_defhlim = IPV6_DEFHLIM; 469 int ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS; 470 int ip6_accept_rtadv = 0; /* "IPV6FORWARDING ? 0 : 1" is dangerous */ 471 int ip6_maxfragpackets = 200; 472 int ip6_maxfrags = 200; 473 int ip6_log_interval = 5; 474 int ip6_hdrnestlimit = 50; /* appropriate? */ 475 int ip6_dad_count = 1; /* DupAddrDetectionTransmits */ 476 int ip6_auto_flowlabel = 1; 477 int ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */ 478 int ip6_rr_prune = 5; /* router renumbering prefix 479 * walk list every 5 sec. */ 480 int ip6_mcast_pmtu = 0; /* enable pMTU discovery for multicast? */ 481 int ip6_v6only = 1; 482 483 int ip6_keepfaith = 0; 484 time_t ip6_log_time = (time_t)0L; 485 486 /* icmp6 */ 487 /* 488 * BSDI4 defines these variables in in_proto.c... 489 * XXX: what if we don't define INET? Should we define pmtu6_expire 490 * or so? (jinmei@kame.net 19990310) 491 */ 492 int pmtu_expire = 60*10; 493 494 /* raw IP6 parameters */ 495 /* 496 * Nominal space allocated to a raw ip socket. 497 */ 498 #define RIPV6SNDQ 8192 499 #define RIPV6RCVQ 8192 500 501 u_long rip6_sendspace = RIPV6SNDQ; 502 u_long rip6_recvspace = RIPV6RCVQ; 503 504 /* ICMPV6 parameters */ 505 int icmp6_rediraccept = 1; /* accept and process redirects */ 506 int icmp6_redirtimeout = 10 * 60; /* 10 minutes */ 507 int icmp6errppslim = 100; /* 100pps */ 508 int icmp6_nodeinfo = 1; /* enable/disable NI response */ 509 510 /* UDP on IP6 parameters */ 511 int udp6_sendspace = 9216; /* really max datagram size */ 512 int udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6)); 513 /* 40 1K datagrams */ 514