1 /* $NetBSD: in6_proto.c,v 1.95 2011/12/31 20:41:59 christos 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 1.95 2011/12/31 20:41:59 christos 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 KAME_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 /* KAME_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 /* 141 * TCP/IP protocol family: IP6, ICMP6, UDP, TCP. 142 */ 143 144 DOMAIN_DEFINE(inet6domain); /* forward declare and add to link set */ 145 146 /* Wrappers to acquire kernel_lock. */ 147 148 PR_WRAP_USRREQ(rip6_usrreq) 149 PR_WRAP_USRREQ(udp6_usrreq) 150 PR_WRAP_USRREQ(tcp_usrreq) 151 152 #define rip6_usrreq rip6_usrreq_wrapper 153 #define udp6_usrreq udp6_usrreq_wrapper 154 #define tcp_usrreq tcp_usrreq_wrapper 155 156 PR_WRAP_CTLINPUT(rip6_ctlinput) 157 PR_WRAP_CTLINPUT(encap6_ctlinput) 158 PR_WRAP_CTLINPUT(udp6_ctlinput) 159 PR_WRAP_CTLINPUT(tcp6_ctlinput) 160 161 #define rip6_ctlinput rip6_ctlinput_wrapper 162 #define encap6_ctlinput encap6_ctlinput_wrapper 163 #define udp6_ctlinput udp6_ctlinput_wrapper 164 #define tcp6_ctlinput tcp6_ctlinput_wrapper 165 166 PR_WRAP_CTLOUTPUT(rip6_ctloutput) 167 PR_WRAP_CTLOUTPUT(tcp_ctloutput) 168 PR_WRAP_CTLOUTPUT(udp6_ctloutput) 169 PR_WRAP_CTLOUTPUT(icmp6_ctloutput) 170 171 #define rip6_ctloutput rip6_ctloutput_wrapper 172 #define tcp_ctloutput tcp_ctloutput_wrapper 173 #define udp6_ctloutput udp6_ctloutput_wrapper 174 #define icmp6_ctloutput icmp6_ctloutput_wrapper 175 176 #if defined(KAME_IPSEC) || defined(FAST_IPSEC) 177 PR_WRAP_CTLINPUT(ah6_ctlinput) 178 179 #define ah6_ctlinput ah6_ctlinput_wrapper 180 #endif 181 182 #if (defined(KAME_IPSEC) && defined(IPSEC_ESP)) || defined(FAST_IPSEC) 183 PR_WRAP_CTLINPUT(esp6_ctlinput) 184 185 #define esp6_ctlinput esp6_ctlinput_wrapper 186 #endif 187 188 const struct ip6protosw inet6sw[] = { 189 { .pr_domain = &inet6domain, 190 .pr_protocol = IPPROTO_IPV6, 191 .pr_init = ip6_init, 192 .pr_fasttimo = frag6_fasttimo, 193 .pr_slowtimo = frag6_slowtimo, 194 .pr_drain = frag6_drainstub, 195 }, 196 { .pr_type = SOCK_DGRAM, 197 .pr_domain = &inet6domain, 198 .pr_protocol = IPPROTO_UDP, 199 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 200 .pr_input = udp6_input, 201 .pr_ctlinput = udp6_ctlinput, 202 .pr_ctloutput = udp6_ctloutput, 203 .pr_usrreq = udp6_usrreq, 204 .pr_init = udp6_init, 205 }, 206 { .pr_type = SOCK_STREAM, 207 .pr_domain = &inet6domain, 208 .pr_protocol = IPPROTO_TCP, 209 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS|PR_PURGEIF, 210 .pr_input = tcp6_input, 211 .pr_ctlinput = tcp6_ctlinput, 212 .pr_ctloutput = tcp_ctloutput, 213 .pr_usrreq = tcp_usrreq, 214 #ifndef INET /* don't call initialization and timeout routines twice */ 215 .pr_init = tcp_init, 216 .pr_fasttimo = tcp_fasttimo, 217 .pr_slowtimo = tcp_slowtimo, 218 .pr_drain = tcp_drainstub, 219 #endif 220 }, 221 { .pr_type = SOCK_RAW, 222 .pr_domain = &inet6domain, 223 .pr_protocol = IPPROTO_RAW, 224 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 225 .pr_input = rip6_input, 226 .pr_output = rip6_output, 227 .pr_ctlinput = rip6_ctlinput, 228 .pr_ctloutput = rip6_ctloutput, 229 .pr_usrreq = rip6_usrreq, 230 }, 231 #ifdef GATEWAY 232 { .pr_domain = &inet6domain, 233 .pr_protocol = IPPROTO_IPV6, 234 .pr_slowtimo = ip6flow_slowtimo, 235 .pr_init = ip6flow_poolinit, 236 }, 237 #endif /* GATEWAY */ 238 { .pr_type = SOCK_RAW, 239 .pr_domain = &inet6domain, 240 .pr_protocol = IPPROTO_ICMPV6, 241 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 242 .pr_input = icmp6_input, 243 .pr_output = rip6_output, 244 .pr_ctlinput = rip6_ctlinput, 245 .pr_ctloutput = icmp6_ctloutput, 246 .pr_usrreq = rip6_usrreq, 247 .pr_init = icmp6_init, 248 }, 249 { .pr_type = SOCK_RAW, 250 .pr_domain = &inet6domain, 251 .pr_protocol = IPPROTO_DSTOPTS, 252 .pr_flags = PR_ATOMIC|PR_ADDR, 253 .pr_input = dest6_input, 254 }, 255 { .pr_type = SOCK_RAW, 256 .pr_domain = &inet6domain, 257 .pr_protocol = IPPROTO_ROUTING, 258 .pr_flags = PR_ATOMIC|PR_ADDR, 259 .pr_input = route6_input, 260 }, 261 { .pr_type = SOCK_RAW, 262 .pr_domain = &inet6domain, 263 .pr_protocol = IPPROTO_FRAGMENT, 264 .pr_flags = PR_ATOMIC|PR_ADDR, 265 .pr_input = frag6_input, 266 }, 267 #ifdef KAME_IPSEC 268 { .pr_type = SOCK_RAW, 269 .pr_domain = &inet6domain, 270 .pr_protocol = IPPROTO_AH, 271 .pr_flags = PR_ATOMIC|PR_ADDR, 272 .pr_input = ah6_input, 273 .pr_ctlinput = ah6_ctlinput, 274 .pr_init = ah6_init, 275 }, 276 #ifdef IPSEC_ESP 277 { .pr_type = SOCK_RAW, 278 .pr_domain = &inet6domain, 279 .pr_protocol = IPPROTO_ESP, 280 .pr_flags = PR_ATOMIC|PR_ADDR, 281 .pr_input = esp6_input, 282 .pr_ctlinput = esp6_ctlinput, 283 .pr_init = esp6_init, 284 }, 285 #endif 286 { .pr_type = SOCK_RAW, 287 .pr_domain = &inet6domain, 288 .pr_protocol = IPPROTO_IPCOMP, 289 .pr_flags = PR_ATOMIC|PR_ADDR, 290 .pr_input = ipcomp6_input, 291 .pr_init = ipcomp6_init, 292 }, 293 #endif /* KAME_IPSEC */ 294 #ifdef FAST_IPSEC 295 { .pr_type = SOCK_RAW, 296 .pr_domain = &inet6domain, 297 .pr_protocol = IPPROTO_AH, 298 .pr_flags = PR_ATOMIC|PR_ADDR, 299 .pr_input = ipsec6_common_input, 300 .pr_ctlinput = ah6_ctlinput, 301 }, 302 { .pr_type = SOCK_RAW, 303 .pr_domain = &inet6domain, 304 .pr_protocol = IPPROTO_ESP, 305 .pr_flags = PR_ATOMIC|PR_ADDR, 306 .pr_input = ipsec6_common_input, 307 .pr_ctlinput = esp6_ctlinput, 308 }, 309 { .pr_type = SOCK_RAW, 310 .pr_domain = &inet6domain, 311 .pr_protocol = IPPROTO_IPCOMP, 312 .pr_flags = PR_ATOMIC|PR_ADDR, 313 .pr_input = ipsec6_common_input, 314 }, 315 #endif /* FAST_IPSEC */ 316 #ifdef INET 317 { .pr_type = SOCK_RAW, 318 .pr_domain = &inet6domain, 319 .pr_protocol = IPPROTO_IPV4, 320 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 321 .pr_input = encap6_input, 322 .pr_output = rip6_output, 323 .pr_ctlinput = encap6_ctlinput, 324 .pr_ctloutput = rip6_ctloutput, 325 .pr_usrreq = rip6_usrreq, 326 .pr_init = encap_init, 327 }, 328 #endif 329 { .pr_type = SOCK_RAW, 330 .pr_domain = &inet6domain, 331 .pr_protocol = IPPROTO_IPV6, 332 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 333 .pr_input = encap6_input, 334 .pr_output = rip6_output, 335 .pr_ctlinput = encap6_ctlinput, 336 .pr_ctloutput = rip6_ctloutput, 337 .pr_usrreq = rip6_usrreq, 338 .pr_init = encap_init, 339 }, 340 #if NETHERIP > 0 341 { .pr_type = SOCK_RAW, 342 .pr_domain = &inet6domain, 343 .pr_protocol = IPPROTO_ETHERIP, 344 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 345 .pr_input = ip6_etherip_input, 346 .pr_output = rip6_output, 347 .pr_ctlinput = rip6_ctlinput, 348 .pr_ctloutput = rip6_ctloutput, 349 .pr_usrreq = rip6_usrreq, 350 }, 351 #endif 352 #if NCARP > 0 353 { .pr_type = SOCK_RAW, 354 .pr_domain = &inet6domain, 355 .pr_protocol = IPPROTO_CARP, 356 .pr_flags = PR_ATOMIC|PR_ADDR, 357 .pr_input = carp6_proto_input, 358 .pr_output = rip6_output, 359 .pr_ctloutput = rip6_ctloutput, 360 .pr_usrreq = rip6_usrreq, 361 }, 362 #endif /* NCARP */ 363 #ifdef ISO 364 { .pr_type = SOCK_RAW, 365 .pr_domain = &inet6domain, 366 .pr_protocol = IPPROTO_EON, 367 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 368 .pr_input = encap6_input, 369 .pr_output = rip6_output, 370 .pr_ctlinput = encap6_ctlinput, 371 .pr_ctloutput = rip6_ctloutput, 372 .pr_usrreq = rip6_usrreq, 373 /*XXX*/ 374 .pr_init = encap_init, 375 }, 376 #endif 377 { .pr_type = SOCK_RAW, 378 .pr_domain = &inet6domain, 379 .pr_protocol = IPPROTO_PIM, 380 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 381 .pr_input = pim6_input, 382 .pr_output = rip6_output, 383 .pr_ctloutput = rip6_ctloutput, 384 .pr_usrreq = rip6_usrreq, 385 .pr_init = pim6_init, 386 }, 387 /* raw wildcard */ 388 { .pr_type = SOCK_RAW, 389 .pr_domain = &inet6domain, 390 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 391 .pr_input = rip6_input, 392 .pr_output = rip6_output, 393 .pr_ctloutput = rip6_ctloutput, 394 .pr_usrreq = rip6_usrreq, 395 .pr_init = rip6_init, 396 }, 397 }; 398 399 static const struct sockaddr_in6 in6_any = { 400 .sin6_len = sizeof(in6_any) 401 , .sin6_family = AF_INET6 402 , .sin6_port = 0 403 , .sin6_flowinfo = 0 404 , .sin6_addr = IN6ADDR_ANY_INIT 405 , .sin6_scope_id = 0 406 }; 407 408 struct domain inet6domain = { 409 .dom_family = AF_INET6, .dom_name = "internet6", 410 .dom_init = NULL, .dom_externalize = NULL, .dom_dispose = NULL, 411 .dom_protosw = (const struct protosw *)inet6sw, 412 .dom_protoswNPROTOSW = (const struct protosw *)&inet6sw[sizeof(inet6sw)/sizeof(inet6sw[0])], 413 .dom_rtattach = rt_inithead, 414 .dom_rtoffset = offsetof(struct sockaddr_in6, sin6_addr) << 3, 415 .dom_maxrtkey = sizeof(struct ip_pack6), 416 .dom_ifattach = in6_domifattach, .dom_ifdetach = in6_domifdetach, 417 .dom_ifqueues = { &ip6intrq, NULL }, 418 .dom_link = { NULL }, 419 .dom_mowner = MOWNER_INIT("",""), 420 .dom_sa_cmpofs = offsetof(struct sockaddr_in6, sin6_addr), 421 .dom_sa_cmplen = sizeof(struct in6_addr), 422 .dom_sa_any = (const struct sockaddr *)&in6_any, 423 .dom_sockaddr_externalize = sockaddr_in6_externalize, 424 .dom_rtcache = LIST_HEAD_INITIALIZER(inet6domain.dom_rtcache) 425 }; 426 427 #if 0 428 int 429 sockaddr_in6_cmp(const struct sockaddr *lsa, const struct sockaddr *rsa) 430 { 431 uint_fast8_t len; 432 const uint_fast8_t addrofs = offsetof(struct sockaddr_in6, sin6_addr), 433 addrend = addrofs + sizeof(struct in6_addr); 434 int rc; 435 const struct sockaddr_in6 *lsin6, *rsin6; 436 437 lsin6 = satocsin6(lsa); 438 rsin6 = satocsin6(rsa); 439 440 len = MIN(addrend, MIN(lsin6->sin6_len, rsin6->sin6_len)); 441 442 if (len > addrofs && 443 (rc = memcmp(&lsin6->sin6_addr, &rsin6->sin6_addr, 444 len - addrofs)) != 0) 445 return rc; 446 447 return lsin6->sin6_len - rsin6->sin6_len; 448 } 449 #endif 450 451 /* 452 * Internet configuration info 453 */ 454 #ifndef IPV6FORWARDING 455 #ifdef GATEWAY6 456 #define IPV6FORWARDING 1 /* forward IP6 packets not for us */ 457 #else 458 #define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */ 459 #endif /* GATEWAY6 */ 460 #endif /* !IPV6FORWARDING */ 461 462 int ip6_forwarding = IPV6FORWARDING; /* act as router? */ 463 int ip6_sendredirects = 1; 464 int ip6_defhlim = IPV6_DEFHLIM; 465 int ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS; 466 int ip6_accept_rtadv = 0; /* "IPV6FORWARDING ? 0 : 1" is dangerous */ 467 int ip6_maxfragpackets = 200; 468 int ip6_maxfrags = 200; 469 int ip6_log_interval = 5; 470 int ip6_hdrnestlimit = 50; /* appropriate? */ 471 int ip6_dad_count = 1; /* DupAddrDetectionTransmits */ 472 int ip6_auto_flowlabel = 1; 473 int ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */ 474 int ip6_rr_prune = 5; /* router renumbering prefix 475 * walk list every 5 sec. */ 476 int ip6_mcast_pmtu = 0; /* enable pMTU discovery for multicast? */ 477 int ip6_v6only = 1; 478 479 int ip6_keepfaith = 0; 480 time_t ip6_log_time = 0; 481 int ip6_rtadv_maxroutes = 100; /* (arbitrary) initial maximum number of 482 * routes via rtadv expected to be 483 * significantly larger than common use. 484 * if you need to count: 3 extra initial 485 * routes, plus 1 per interface after the 486 * first one, then one per non-linklocal 487 * prefix */ 488 489 /* icmp6 */ 490 /* 491 * BSDI4 defines these variables in in_proto.c... 492 * XXX: what if we don't define INET? Should we define pmtu6_expire 493 * or so? (jinmei@kame.net 19990310) 494 */ 495 int pmtu_expire = 60*10; 496 497 /* raw IP6 parameters */ 498 /* 499 * Nominal space allocated to a raw ip socket. 500 */ 501 #define RIPV6SNDQ 8192 502 #define RIPV6RCVQ 8192 503 504 u_long rip6_sendspace = RIPV6SNDQ; 505 u_long rip6_recvspace = RIPV6RCVQ; 506 507 /* ICMPV6 parameters */ 508 int icmp6_rediraccept = 1; /* accept and process redirects */ 509 int icmp6_redirtimeout = 10 * 60; /* 10 minutes */ 510 int icmp6errppslim = 100; /* 100pps */ 511 int icmp6_nodeinfo = 1; /* enable/disable NI response */ 512 513 /* UDP on IP6 parameters */ 514 int udp6_sendspace = 9216; /* really max datagram size */ 515 int udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6)); 516 /* 40 1K datagrams */ 517