1 /* $NetBSD: in6_proto.c,v 1.83 2008/11/25 18:28:06 pooka 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 1.83 2008/11/25 18:28:06 pooka Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_ipsec.h" 69 #include "opt_iso.h" 70 71 #include <sys/param.h> 72 #include <sys/socket.h> 73 #include <sys/protosw.h> 74 #include <sys/kernel.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/in_var.h> 85 #include <netinet/ip_encap.h> 86 #include <netinet/ip.h> 87 #include <netinet/ip_var.h> 88 #include <netinet/in_pcb.h> 89 #include <netinet/ip6.h> 90 #include <netinet6/ip6_var.h> 91 #include <netinet/icmp6.h> 92 #include <netinet6/in6_pcb.h> 93 94 #include <netinet/tcp.h> 95 #include <netinet/tcp_fsm.h> 96 #include <netinet/tcp_seq.h> 97 #include <netinet/tcp_timer.h> 98 #include <netinet/tcp_var.h> 99 #include <netinet/tcpip.h> 100 #include <netinet/tcp_debug.h> 101 102 #include <netinet6/udp6.h> 103 #include <netinet6/udp6_var.h> 104 105 #include <netinet6/pim6_var.h> 106 107 #include <netinet6/nd6.h> 108 109 #ifdef IPSEC 110 #include <netinet6/ipsec.h> 111 #include <netinet6/ah.h> 112 #ifdef IPSEC_ESP 113 #include <netinet6/esp.h> 114 #endif 115 #include <netinet6/ipcomp.h> 116 #endif /* IPSEC */ 117 118 #ifdef FAST_IPSEC 119 #include <netipsec/ipsec.h> 120 #include <netipsec/ipsec6.h> 121 #include <netipsec/key.h> 122 #endif /* FAST_IPSEC */ 123 124 125 #include "carp.h" 126 #if NCARP > 0 127 #include <netinet/ip_carp.h> 128 #endif 129 130 #include "etherip.h" 131 #if NETHERIP > 1 132 #include <netinet6/ip6_etherip.h> 133 #endif 134 135 #include <netinet6/ip6protosw.h> 136 137 #include <net/net_osdep.h> 138 139 #ifndef offsetof /* XXX */ 140 #define offsetof(type, member) ((size_t)(&((type *)0)->member)) 141 #endif 142 143 /* 144 * TCP/IP protocol family: IP6, ICMP6, UDP, TCP. 145 */ 146 147 DOMAIN_DEFINE(inet6domain); /* forward declare and add to link set */ 148 149 /* Wrappers to acquire kernel_lock. */ 150 151 PR_WRAP_USRREQ(rip6_usrreq) 152 PR_WRAP_USRREQ(udp6_usrreq) 153 PR_WRAP_USRREQ(tcp_usrreq) 154 155 #define rip6_usrreq rip6_usrreq_wrapper 156 #define udp6_usrreq udp6_usrreq_wrapper 157 #define tcp_usrreq tcp_usrreq_wrapper 158 159 PR_WRAP_CTLINPUT(rip6_ctlinput) 160 PR_WRAP_CTLINPUT(encap6_ctlinput) 161 PR_WRAP_CTLINPUT(udp6_ctlinput) 162 PR_WRAP_CTLINPUT(tcp6_ctlinput) 163 164 #define rip6_ctlinput rip6_ctlinput_wrapper 165 #define encap6_ctlinput encap6_ctlinput_wrapper 166 #define udp6_ctlinput udp6_ctlinput_wrapper 167 #define tcp6_ctlinput tcp6_ctlinput_wrapper 168 169 PR_WRAP_CTLOUTPUT(rip6_ctloutput) 170 PR_WRAP_CTLOUTPUT(ip6_ctloutput) 171 PR_WRAP_CTLOUTPUT(tcp_ctloutput) 172 PR_WRAP_CTLOUTPUT(icmp6_ctloutput) 173 174 #define rip6_ctloutput rip6_ctloutput_wrapper 175 #define ip6_ctloutput ip6_ctloutput_wrapper 176 #define tcp_ctloutput tcp_ctloutput_wrapper 177 #define icmp6_ctloutput icmp6_ctloutput_wrapper 178 179 #if defined(IPSEC) || defined(FAST_IPSEC) 180 PR_WRAP_CTLINPUT(ah6_ctlinput) 181 PR_WRAP_CTLINPUT(esp6_ctlinput) 182 183 #define ah6_ctlinput ah6_ctlinput_wrapper 184 #define esp6_ctlinput esp6_ctlinput_wrapper 185 #endif 186 187 const struct ip6protosw inet6sw[] = { 188 { .pr_domain = &inet6domain, 189 .pr_protocol = IPPROTO_IPV6, 190 .pr_init = ip6_init, 191 .pr_slowtimo = frag6_slowtimo, 192 .pr_drain = frag6_drain, 193 }, 194 { .pr_type = SOCK_DGRAM, 195 .pr_domain = &inet6domain, 196 .pr_protocol = IPPROTO_UDP, 197 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 198 .pr_input = udp6_input, 199 .pr_ctlinput = udp6_ctlinput, 200 .pr_ctloutput = ip6_ctloutput, 201 .pr_usrreq = udp6_usrreq, 202 .pr_init = udp6_init, 203 }, 204 { .pr_type = SOCK_STREAM, 205 .pr_domain = &inet6domain, 206 .pr_protocol = IPPROTO_TCP, 207 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS|PR_PURGEIF, 208 .pr_input = tcp6_input, 209 .pr_ctlinput = tcp6_ctlinput, 210 .pr_ctloutput = tcp_ctloutput, 211 .pr_usrreq = tcp_usrreq, 212 #ifndef INET /* don't call initialization and timeout routines twice */ 213 .pr_init = tcp_init, 214 .pr_slowtimo = tcp_slowtimo, 215 .pr_drain = tcp_drain, 216 #endif 217 }, 218 { .pr_type = SOCK_RAW, 219 .pr_domain = &inet6domain, 220 .pr_protocol = IPPROTO_RAW, 221 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 222 .pr_input = rip6_input, 223 .pr_output = rip6_output, 224 .pr_ctlinput = rip6_ctlinput, 225 .pr_ctloutput = rip6_ctloutput, 226 .pr_usrreq = rip6_usrreq, 227 }, 228 #ifdef GATEWAY 229 { .pr_domain = &inet6domain, 230 .pr_protocol = IPPROTO_IPV6, 231 .pr_slowtimo = ip6flow_slowtimo, 232 }, 233 #endif /* GATEWAY */ 234 { .pr_type = SOCK_RAW, 235 .pr_domain = &inet6domain, 236 .pr_protocol = IPPROTO_ICMPV6, 237 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 238 .pr_input = icmp6_input, 239 .pr_output = rip6_output, 240 .pr_ctlinput = rip6_ctlinput, 241 .pr_ctloutput = icmp6_ctloutput, 242 .pr_usrreq = rip6_usrreq, 243 .pr_init = icmp6_init, 244 }, 245 { .pr_type = SOCK_RAW, 246 .pr_domain = &inet6domain, 247 .pr_protocol = IPPROTO_DSTOPTS, 248 .pr_flags = PR_ATOMIC|PR_ADDR, 249 .pr_input = dest6_input, 250 }, 251 { .pr_type = SOCK_RAW, 252 .pr_domain = &inet6domain, 253 .pr_protocol = IPPROTO_ROUTING, 254 .pr_flags = PR_ATOMIC|PR_ADDR, 255 .pr_input = route6_input, 256 }, 257 { .pr_type = SOCK_RAW, 258 .pr_domain = &inet6domain, 259 .pr_protocol = IPPROTO_FRAGMENT, 260 .pr_flags = PR_ATOMIC|PR_ADDR, 261 .pr_input = frag6_input, 262 }, 263 #ifdef IPSEC 264 { .pr_type = SOCK_RAW, 265 .pr_domain = &inet6domain, 266 .pr_protocol = IPPROTO_AH, 267 .pr_flags = PR_ATOMIC|PR_ADDR, 268 .pr_input = ah6_input, 269 .pr_ctlinput = ah6_ctlinput, 270 .pr_init = ah6_init, 271 }, 272 #ifdef IPSEC_ESP 273 { .pr_type = SOCK_RAW, 274 .pr_domain = &inet6domain, 275 .pr_protocol = IPPROTO_ESP, 276 .pr_flags = PR_ATOMIC|PR_ADDR, 277 .pr_input = esp6_input, 278 .pr_ctlinput = esp6_ctlinput, 279 .pr_init = esp6_init, 280 }, 281 #endif 282 { .pr_type = SOCK_RAW, 283 .pr_domain = &inet6domain, 284 .pr_protocol = IPPROTO_IPCOMP, 285 .pr_flags = PR_ATOMIC|PR_ADDR, 286 .pr_input = ipcomp6_input, 287 .pr_init = ipcomp6_init, 288 }, 289 #endif /* IPSEC */ 290 #ifdef FAST_IPSEC 291 { .pr_type = SOCK_RAW, 292 .pr_domain = &inet6domain, 293 .pr_protocol = IPPROTO_AH, 294 .pr_flags = PR_ATOMIC|PR_ADDR, 295 .pr_input = ipsec6_common_input, 296 .pr_ctlinput = ah6_ctlinput, 297 }, 298 { .pr_type = SOCK_RAW, 299 .pr_domain = &inet6domain, 300 .pr_protocol = IPPROTO_ESP, 301 .pr_flags = PR_ATOMIC|PR_ADDR, 302 .pr_input = ipsec6_common_input, 303 .pr_ctlinput = esp6_ctlinput, 304 }, 305 { .pr_type = SOCK_RAW, 306 .pr_domain = &inet6domain, 307 .pr_protocol = IPPROTO_IPCOMP, 308 .pr_flags = PR_ATOMIC|PR_ADDR, 309 .pr_input = ipsec6_common_input, 310 }, 311 #endif /* FAST_IPSEC */ 312 #ifdef INET 313 { .pr_type = SOCK_RAW, 314 .pr_domain = &inet6domain, 315 .pr_protocol = IPPROTO_IPV4, 316 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 317 .pr_input = encap6_input, 318 .pr_output = rip6_output, 319 .pr_ctlinput = encap6_ctlinput, 320 .pr_ctloutput = rip6_ctloutput, 321 .pr_usrreq = rip6_usrreq, 322 .pr_init = encap_init, 323 }, 324 #endif 325 { .pr_type = SOCK_RAW, 326 .pr_domain = &inet6domain, 327 .pr_protocol = IPPROTO_IPV6, 328 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 329 .pr_input = encap6_input, 330 .pr_output = rip6_output, 331 .pr_ctlinput = encap6_ctlinput, 332 .pr_ctloutput = rip6_ctloutput, 333 .pr_usrreq = rip6_usrreq, 334 .pr_init = encap_init, 335 }, 336 #if NETHERIP > 1 337 { .pr_type = SOCK_RAW, 338 .pr_domain = &inet6domain, 339 .pr_protocol = IPPROTO_ETHERIP, 340 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 341 .pr_input = ip6_etherip_input, 342 .pr_output = rip6_output, 343 .pr_ctlinput = rip6_ctlinput, 344 .pr_ctloutput = rip6_ctloutput, 345 .pr_usrreq = rip6_usrreq, 346 }, 347 #endif 348 #if NCARP > 0 349 { .pr_type = SOCK_RAW, 350 .pr_domain = &inet6domain, 351 .pr_protocol = IPPROTO_CARP, 352 .pr_flags = PR_ATOMIC|PR_ADDR, 353 .pr_input = carp6_proto_input, 354 .pr_output = rip6_output, 355 .pr_ctloutput = rip6_ctloutput, 356 .pr_usrreq = rip6_usrreq, 357 }, 358 #endif /* NCARP */ 359 #ifdef ISO 360 { .pr_type = SOCK_RAW, 361 .pr_domain = &inet6domain, 362 .pr_protocol = IPPROTO_EON, 363 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 364 .pr_input = encap6_input, 365 .pr_output = rip6_output, 366 .pr_ctlinput = encap6_ctlinput, 367 .pr_ctloutput = rip6_ctloutput, 368 .pr_usrreq = rip6_usrreq, 369 /*XXX*/ 370 .pr_init = encap_init, 371 }, 372 #endif 373 { .pr_type = SOCK_RAW, 374 .pr_domain = &inet6domain, 375 .pr_protocol = IPPROTO_PIM, 376 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 377 .pr_input = pim6_input, 378 .pr_output = rip6_output, 379 .pr_ctloutput = rip6_ctloutput, 380 .pr_usrreq = rip6_usrreq, 381 .pr_init = pim6_init, 382 }, 383 /* raw wildcard */ 384 { .pr_type = SOCK_RAW, 385 .pr_domain = &inet6domain, 386 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 387 .pr_input = rip6_input, 388 .pr_output = rip6_output, 389 .pr_ctloutput = rip6_ctloutput, 390 .pr_usrreq = rip6_usrreq, 391 .pr_init = rip6_init, 392 }, 393 }; 394 395 static const struct sockaddr_in6 in6_any = { 396 .sin6_len = sizeof(in6_any) 397 , .sin6_family = AF_INET6 398 , .sin6_port = 0 399 , .sin6_flowinfo = 0 400 , .sin6_addr = IN6ADDR_ANY_INIT 401 , .sin6_scope_id = 0 402 }; 403 404 struct domain inet6domain = { 405 .dom_family = AF_INET6, .dom_name = "internet6", 406 .dom_init = NULL, .dom_externalize = NULL, .dom_dispose = NULL, 407 .dom_protosw = (const struct protosw *)inet6sw, 408 .dom_protoswNPROTOSW = (const struct protosw *)&inet6sw[sizeof(inet6sw)/sizeof(inet6sw[0])], 409 .dom_rtattach = rn_inithead, 410 .dom_rtoffset = offsetof(struct sockaddr_in6, sin6_addr) << 3, 411 .dom_maxrtkey = sizeof(struct ip_pack6), 412 .dom_ifattach = in6_domifattach, .dom_ifdetach = in6_domifdetach, 413 .dom_ifqueues = { &ip6intrq, NULL }, 414 .dom_link = { NULL }, 415 .dom_mowner = MOWNER_INIT("",""), 416 .dom_sa_cmpofs = offsetof(struct sockaddr_in6, sin6_addr), 417 .dom_sa_cmplen = sizeof(struct in6_addr), 418 .dom_sa_any = (const struct sockaddr *)&in6_any, 419 .dom_rtcache = LIST_HEAD_INITIALIZER(inet6domain.dom_rtcache) 420 }; 421 422 int 423 sockaddr_in6_cmp(const struct sockaddr *lsa, const struct sockaddr *rsa) 424 { 425 uint_fast8_t len; 426 const uint_fast8_t addrofs = offsetof(struct sockaddr_in6, sin6_addr), 427 addrend = addrofs + sizeof(struct in6_addr); 428 int rc; 429 const struct sockaddr_in6 *lsin6, *rsin6; 430 431 lsin6 = satocsin6(lsa); 432 rsin6 = satocsin6(rsa); 433 434 len = MIN(addrend, MIN(lsin6->sin6_len, rsin6->sin6_len)); 435 436 if (len > addrofs && 437 (rc = memcmp(&lsin6->sin6_addr, &rsin6->sin6_addr, 438 len - addrofs)) != 0) 439 return rc; 440 441 return lsin6->sin6_len - rsin6->sin6_len; 442 } 443 444 /* 445 * Internet configuration info 446 */ 447 #ifndef IPV6FORWARDING 448 #ifdef GATEWAY6 449 #define IPV6FORWARDING 1 /* forward IP6 packets not for us */ 450 #else 451 #define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */ 452 #endif /* GATEWAY6 */ 453 #endif /* !IPV6FORWARDING */ 454 455 int ip6_forwarding = IPV6FORWARDING; /* act as router? */ 456 int ip6_sendredirects = 1; 457 int ip6_defhlim = IPV6_DEFHLIM; 458 int ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS; 459 int ip6_accept_rtadv = 0; /* "IPV6FORWARDING ? 0 : 1" is dangerous */ 460 int ip6_maxfragpackets = 200; 461 int ip6_maxfrags = 200; 462 int ip6_log_interval = 5; 463 int ip6_hdrnestlimit = 50; /* appropriate? */ 464 int ip6_dad_count = 1; /* DupAddrDetectionTransmits */ 465 int ip6_auto_flowlabel = 1; 466 int ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */ 467 int ip6_rr_prune = 5; /* router renumbering prefix 468 * walk list every 5 sec. */ 469 int ip6_mcast_pmtu = 0; /* enable pMTU discovery for multicast? */ 470 int ip6_v6only = 1; 471 472 int ip6_keepfaith = 0; 473 time_t ip6_log_time = (time_t)0L; 474 475 /* icmp6 */ 476 /* 477 * BSDI4 defines these variables in in_proto.c... 478 * XXX: what if we don't define INET? Should we define pmtu6_expire 479 * or so? (jinmei@kame.net 19990310) 480 */ 481 int pmtu_expire = 60*10; 482 483 /* raw IP6 parameters */ 484 /* 485 * Nominal space allocated to a raw ip socket. 486 */ 487 #define RIPV6SNDQ 8192 488 #define RIPV6RCVQ 8192 489 490 u_long rip6_sendspace = RIPV6SNDQ; 491 u_long rip6_recvspace = RIPV6RCVQ; 492 493 /* ICMPV6 parameters */ 494 int icmp6_rediraccept = 1; /* accept and process redirects */ 495 int icmp6_redirtimeout = 10 * 60; /* 10 minutes */ 496 int icmp6errppslim = 100; /* 100pps */ 497 int icmp6_nodeinfo = 1; /* enable/disable NI response */ 498 499 /* UDP on IP6 parameters */ 500 int udp6_sendspace = 9216; /* really max datagram size */ 501 int udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6)); 502 /* 40 1K datagrams */ 503