in6_proto.c revision 1.79
1 /* $NetBSD: in6_proto.c,v 1.79 2007/09/19 04:33:44 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 1.79 2007/09/19 04:33:44 dyoung 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 const struct ip6protosw inet6sw[] = { 150 { .pr_domain = &inet6domain, 151 .pr_protocol = IPPROTO_IPV6, 152 .pr_init = ip6_init, 153 .pr_slowtimo = frag6_slowtimo, 154 .pr_drain = frag6_drain, 155 }, 156 { .pr_type = SOCK_DGRAM, 157 .pr_domain = &inet6domain, 158 .pr_protocol = IPPROTO_UDP, 159 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 160 .pr_input = udp6_input, 161 .pr_ctlinput = udp6_ctlinput, 162 .pr_ctloutput = ip6_ctloutput, 163 .pr_usrreq = udp6_usrreq, 164 .pr_init = udp6_init, 165 }, 166 { .pr_type = SOCK_STREAM, 167 .pr_domain = &inet6domain, 168 .pr_protocol = IPPROTO_TCP, 169 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS|PR_PURGEIF, 170 .pr_input = tcp6_input, 171 .pr_ctlinput = tcp6_ctlinput, 172 .pr_ctloutput = tcp_ctloutput, 173 .pr_usrreq = tcp_usrreq, 174 #ifndef INET /* don't call initialization and timeout routines twice */ 175 .pr_init = tcp_init, 176 .pr_slowtimo = tcp_slowtimo, 177 .pr_drain = tcp_drain, 178 #endif 179 }, 180 { .pr_type = SOCK_RAW, 181 .pr_domain = &inet6domain, 182 .pr_protocol = IPPROTO_RAW, 183 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 184 .pr_input = rip6_input, 185 .pr_output = rip6_output, 186 .pr_ctlinput = rip6_ctlinput, 187 .pr_ctloutput = rip6_ctloutput, 188 .pr_usrreq = rip6_usrreq, 189 }, 190 #ifdef GATEWAY 191 { .pr_domain = &inet6domain, 192 .pr_protocol = IPPROTO_IPV6, 193 .pr_slowtimo = ip6flow_slowtimo, 194 }, 195 #endif /* GATEWAY */ 196 { .pr_type = SOCK_RAW, 197 .pr_domain = &inet6domain, 198 .pr_protocol = IPPROTO_ICMPV6, 199 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 200 .pr_input = icmp6_input, 201 .pr_output = rip6_output, 202 .pr_ctlinput = rip6_ctlinput, 203 .pr_ctloutput = icmp6_ctloutput, 204 .pr_usrreq = rip6_usrreq, 205 .pr_init = icmp6_init, 206 }, 207 { .pr_type = SOCK_RAW, 208 .pr_domain = &inet6domain, 209 .pr_protocol = IPPROTO_DSTOPTS, 210 .pr_flags = PR_ATOMIC|PR_ADDR, 211 .pr_input = dest6_input, 212 }, 213 { .pr_type = SOCK_RAW, 214 .pr_domain = &inet6domain, 215 .pr_protocol = IPPROTO_ROUTING, 216 .pr_flags = PR_ATOMIC|PR_ADDR, 217 .pr_input = route6_input, 218 }, 219 { .pr_type = SOCK_RAW, 220 .pr_domain = &inet6domain, 221 .pr_protocol = IPPROTO_FRAGMENT, 222 .pr_flags = PR_ATOMIC|PR_ADDR, 223 .pr_input = frag6_input, 224 }, 225 #ifdef IPSEC 226 { .pr_type = SOCK_RAW, 227 .pr_domain = &inet6domain, 228 .pr_protocol = IPPROTO_AH, 229 .pr_flags = PR_ATOMIC|PR_ADDR, 230 .pr_input = ah6_input, 231 .pr_ctlinput = ah6_ctlinput, 232 }, 233 #ifdef IPSEC_ESP 234 { .pr_type = SOCK_RAW, 235 .pr_domain = &inet6domain, 236 .pr_protocol = IPPROTO_ESP, 237 .pr_flags = PR_ATOMIC|PR_ADDR, 238 .pr_input = esp6_input, 239 .pr_ctlinput = esp6_ctlinput, 240 }, 241 #endif 242 { .pr_type = SOCK_RAW, 243 .pr_domain = &inet6domain, 244 .pr_protocol = IPPROTO_IPCOMP, 245 .pr_flags = PR_ATOMIC|PR_ADDR, 246 .pr_input = ipcomp6_input, 247 }, 248 #endif /* IPSEC */ 249 #ifdef FAST_IPSEC 250 { .pr_type = SOCK_RAW, 251 .pr_domain = &inet6domain, 252 .pr_protocol = IPPROTO_AH, 253 .pr_flags = PR_ATOMIC|PR_ADDR, 254 .pr_input = ipsec6_common_input, 255 .pr_ctlinput = ah6_ctlinput, 256 }, 257 { .pr_type = SOCK_RAW, 258 .pr_domain = &inet6domain, 259 .pr_protocol = IPPROTO_ESP, 260 .pr_flags = PR_ATOMIC|PR_ADDR, 261 .pr_input = ipsec6_common_input, 262 .pr_ctlinput = esp6_ctlinput, 263 }, 264 { .pr_type = SOCK_RAW, 265 .pr_domain = &inet6domain, 266 .pr_protocol = IPPROTO_IPCOMP, 267 .pr_flags = PR_ATOMIC|PR_ADDR, 268 .pr_input = ipsec6_common_input, 269 }, 270 #endif /* FAST_IPSEC */ 271 #ifdef INET 272 { .pr_type = SOCK_RAW, 273 .pr_domain = &inet6domain, 274 .pr_protocol = IPPROTO_IPV4, 275 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 276 .pr_input = encap6_input, 277 .pr_output = rip6_output, 278 .pr_ctlinput = encap6_ctlinput, 279 .pr_ctloutput = rip6_ctloutput, 280 .pr_usrreq = rip6_usrreq, 281 .pr_init = encap_init, 282 }, 283 #endif 284 { .pr_type = SOCK_RAW, 285 .pr_domain = &inet6domain, 286 .pr_protocol = IPPROTO_IPV6, 287 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 288 .pr_input = encap6_input, 289 .pr_output = rip6_output, 290 .pr_ctlinput = encap6_ctlinput, 291 .pr_ctloutput = rip6_ctloutput, 292 .pr_usrreq = rip6_usrreq, 293 .pr_init = encap_init, 294 }, 295 #if NETHERIP > 1 296 { .pr_type = SOCK_RAW, 297 .pr_domain = &inet6domain, 298 .pr_protocol = IPPROTO_ETHERIP, 299 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 300 .pr_input = ip6_etherip_input, 301 .pr_output = rip6_output, 302 .pr_ctlinput = rip6_ctlinput, 303 .pr_ctloutput = rip6_ctloutput, 304 .pr_usrreq = rip6_usrreq, 305 }, 306 #endif 307 #if NCARP > 0 308 { .pr_type = SOCK_RAW, 309 .pr_domain = &inet6domain, 310 .pr_protocol = IPPROTO_CARP, 311 .pr_flags = PR_ATOMIC|PR_ADDR, 312 .pr_input = carp6_proto_input, 313 .pr_output = rip6_output, 314 .pr_ctloutput = rip6_ctloutput, 315 .pr_usrreq = rip6_usrreq, 316 }, 317 #endif /* NCARP */ 318 #ifdef ISO 319 { .pr_type = SOCK_RAW, 320 .pr_domain = &inet6domain, 321 .pr_protocol = IPPROTO_EON, 322 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 323 .pr_input = encap6_input, 324 .pr_output = rip6_output, 325 .pr_ctlinput = encap6_ctlinput, 326 .pr_ctloutput = rip6_ctloutput, 327 .pr_usrreq = rip6_usrreq, 328 /*XXX*/ 329 .pr_init = encap_init, 330 }, 331 #endif 332 { .pr_type = SOCK_RAW, 333 .pr_domain = &inet6domain, 334 .pr_protocol = IPPROTO_PIM, 335 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 336 .pr_input = pim6_input, 337 .pr_output = rip6_output, 338 .pr_ctloutput = rip6_ctloutput, 339 .pr_usrreq = rip6_usrreq, 340 }, 341 /* raw wildcard */ 342 { .pr_type = SOCK_RAW, 343 .pr_domain = &inet6domain, 344 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 345 .pr_input = rip6_input, 346 .pr_output = rip6_output, 347 .pr_ctloutput = rip6_ctloutput, 348 .pr_usrreq = rip6_usrreq, 349 .pr_init = rip6_init, 350 }, 351 }; 352 353 static const struct sockaddr_in6 in6_any = { 354 .sin6_len = sizeof(in6_any) 355 , .sin6_family = AF_INET6 356 , .sin6_port = 0 357 , .sin6_flowinfo = 0 358 , .sin6_addr = IN6ADDR_ANY_INIT 359 , .sin6_scope_id = 0 360 }; 361 362 struct domain inet6domain = { 363 .dom_family = AF_INET6, .dom_name = "internet6", 364 .dom_init = NULL, .dom_externalize = NULL, .dom_dispose = NULL, 365 .dom_protosw = (const struct protosw *)inet6sw, 366 .dom_protoswNPROTOSW = (const struct protosw *)&inet6sw[sizeof(inet6sw)/sizeof(inet6sw[0])], 367 .dom_rtattach = rn_inithead, 368 .dom_rtoffset = offsetof(struct sockaddr_in6, sin6_addr) << 3, 369 .dom_maxrtkey = sizeof(struct sockaddr_in6), 370 .dom_ifattach = in6_domifattach, .dom_ifdetach = in6_domifdetach, 371 .dom_ifqueues = { &ip6intrq, NULL }, 372 .dom_link = { NULL }, 373 .dom_mowner = MOWNER_INIT("",""), 374 .dom_sa_cmpofs = offsetof(struct sockaddr_in6, sin6_addr), 375 .dom_sa_cmplen = sizeof(struct in6_addr), 376 .dom_sa_any = (const struct sockaddr *)&in6_any, 377 .dom_rtcache = LIST_HEAD_INITIALIZER(inet6domain.dom_rtcache) 378 }; 379 380 int 381 sockaddr_in6_cmp(const struct sockaddr *lsa, const struct sockaddr *rsa) 382 { 383 uint_fast8_t len; 384 const uint_fast8_t addrofs = offsetof(struct sockaddr_in6, sin6_addr), 385 addrend = addrofs + sizeof(struct in6_addr); 386 int rc; 387 const struct sockaddr_in6 *lsin6, *rsin6; 388 389 lsin6 = satocsin6(lsa); 390 rsin6 = satocsin6(rsa); 391 392 len = MIN(addrend, MIN(lsin6->sin6_len, rsin6->sin6_len)); 393 394 if (len > addrofs && 395 (rc = memcmp(&lsin6->sin6_addr, &rsin6->sin6_addr, 396 len - addrofs)) != 0) 397 return rc; 398 399 return lsin6->sin6_len - rsin6->sin6_len; 400 } 401 402 /* 403 * Internet configuration info 404 */ 405 #ifndef IPV6FORWARDING 406 #ifdef GATEWAY6 407 #define IPV6FORWARDING 1 /* forward IP6 packets not for us */ 408 #else 409 #define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */ 410 #endif /* GATEWAY6 */ 411 #endif /* !IPV6FORWARDING */ 412 413 int ip6_forwarding = IPV6FORWARDING; /* act as router? */ 414 int ip6_sendredirects = 1; 415 int ip6_defhlim = IPV6_DEFHLIM; 416 int ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS; 417 int ip6_accept_rtadv = 0; /* "IPV6FORWARDING ? 0 : 1" is dangerous */ 418 int ip6_maxfragpackets = 200; 419 int ip6_maxfrags = 200; 420 int ip6_log_interval = 5; 421 int ip6_hdrnestlimit = 50; /* appropriate? */ 422 int ip6_dad_count = 1; /* DupAddrDetectionTransmits */ 423 int ip6_auto_flowlabel = 1; 424 int ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */ 425 int ip6_rr_prune = 5; /* router renumbering prefix 426 * walk list every 5 sec. */ 427 int ip6_mcast_pmtu = 0; /* enable pMTU discovery for multicast? */ 428 int ip6_v6only = 1; 429 430 int ip6_keepfaith = 0; 431 time_t ip6_log_time = (time_t)0L; 432 433 /* icmp6 */ 434 /* 435 * BSDI4 defines these variables in in_proto.c... 436 * XXX: what if we don't define INET? Should we define pmtu6_expire 437 * or so? (jinmei (at) kame.net 19990310) 438 */ 439 int pmtu_expire = 60*10; 440 441 /* raw IP6 parameters */ 442 /* 443 * Nominal space allocated to a raw ip socket. 444 */ 445 #define RIPV6SNDQ 8192 446 #define RIPV6RCVQ 8192 447 448 u_long rip6_sendspace = RIPV6SNDQ; 449 u_long rip6_recvspace = RIPV6RCVQ; 450 451 /* ICMPV6 parameters */ 452 int icmp6_rediraccept = 1; /* accept and process redirects */ 453 int icmp6_redirtimeout = 10 * 60; /* 10 minutes */ 454 int icmp6errppslim = 100; /* 100pps */ 455 int icmp6_nodeinfo = 1; /* enable/disable NI response */ 456 457 /* UDP on IP6 parameters */ 458 int udp6_sendspace = 9216; /* really max datagram size */ 459 int udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6)); 460 /* 40 1K datagrams */ 461
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