in6_proto.c revision 1.72
1 /* $NetBSD: in6_proto.c,v 1.72 2007/02/19 07:28:58 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 1.72 2007/02/19 07:28:58 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 { .pr_type = SOCK_RAW, 191 .pr_domain = &inet6domain, 192 .pr_protocol = IPPROTO_ICMPV6, 193 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 194 .pr_input = icmp6_input, 195 .pr_output = rip6_output, 196 .pr_ctlinput = rip6_ctlinput, 197 .pr_ctloutput = rip6_ctloutput, 198 .pr_usrreq = rip6_usrreq, 199 .pr_init = icmp6_init, 200 }, 201 { .pr_type = SOCK_RAW, 202 .pr_domain = &inet6domain, 203 .pr_protocol = IPPROTO_DSTOPTS, 204 .pr_flags = PR_ATOMIC|PR_ADDR, 205 .pr_input = dest6_input, 206 }, 207 { .pr_type = SOCK_RAW, 208 .pr_domain = &inet6domain, 209 .pr_protocol = IPPROTO_ROUTING, 210 .pr_flags = PR_ATOMIC|PR_ADDR, 211 .pr_input = route6_input, 212 }, 213 { .pr_type = SOCK_RAW, 214 .pr_domain = &inet6domain, 215 .pr_protocol = IPPROTO_FRAGMENT, 216 .pr_flags = PR_ATOMIC|PR_ADDR, 217 .pr_input = frag6_input, 218 }, 219 #ifdef IPSEC 220 { .pr_type = SOCK_RAW, 221 .pr_domain = &inet6domain, 222 .pr_protocol = IPPROTO_AH, 223 .pr_flags = PR_ATOMIC|PR_ADDR, 224 .pr_input = ah6_input, 225 .pr_ctlinput = ah6_ctlinput, 226 }, 227 #ifdef IPSEC_ESP 228 { .pr_type = SOCK_RAW, 229 .pr_domain = &inet6domain, 230 .pr_protocol = IPPROTO_ESP, 231 .pr_flags = PR_ATOMIC|PR_ADDR, 232 .pr_input = esp6_input, 233 .pr_ctlinput = esp6_ctlinput, 234 }, 235 #endif 236 { .pr_type = SOCK_RAW, 237 .pr_domain = &inet6domain, 238 .pr_protocol = IPPROTO_IPCOMP, 239 .pr_flags = PR_ATOMIC|PR_ADDR, 240 .pr_input = ipcomp6_input, 241 }, 242 #endif /* IPSEC */ 243 #ifdef FAST_IPSEC 244 { SOCK_RAW, &inet6domain, IPPROTO_AH, PR_ATOMIC|PR_ADDR, 245 ipsec6_common_input, 0, ah6_ctlinput, 0, 246 0, 247 0, 0, 0, 0, 248 }, 249 { SOCK_RAW, &inet6domain, IPPROTO_ESP, PR_ATOMIC|PR_ADDR, 250 ipsec6_common_input, 0, esp6_ctlinput, 0, 251 0, 252 0, 0, 0, 0, 253 }, 254 { SOCK_RAW, &inet6domain, IPPROTO_IPCOMP, PR_ATOMIC|PR_ADDR, 255 ipsec6_common_input, 0, 0, 0, 256 0, 257 0, 0, 0, 0, 258 }, 259 #endif /* FAST_IPSEC */ 260 #ifdef INET 261 { .pr_type = SOCK_RAW, 262 .pr_domain = &inet6domain, 263 .pr_protocol = IPPROTO_IPV4, 264 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 265 .pr_input = encap6_input, 266 .pr_output = rip6_output, 267 .pr_ctlinput = encap6_ctlinput, 268 .pr_ctloutput = rip6_ctloutput, 269 .pr_usrreq = rip6_usrreq, 270 .pr_init = encap_init, 271 }, 272 #endif 273 { .pr_type = SOCK_RAW, 274 .pr_domain = &inet6domain, 275 .pr_protocol = IPPROTO_IPV6, 276 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 277 .pr_input = encap6_input, 278 .pr_output = rip6_output, 279 .pr_ctlinput = encap6_ctlinput, 280 .pr_ctloutput = rip6_ctloutput, 281 .pr_usrreq = rip6_usrreq, 282 .pr_init = encap_init, 283 }, 284 #if NETHERIP > 1 285 { .pr_type = SOCK_RAW, 286 .pr_domain = &inet6domain, 287 .pr_protocol = IPPROTO_ETHERIP, 288 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 289 .pr_input = ip6_etherip_input, 290 .pr_output = rip6_output, 291 .pr_ctlinput = rip6_ctlinput, 292 .pr_ctloutput = rip6_ctloutput, 293 .pr_usrreq = rip6_usrreq, 294 }, 295 #endif 296 #if NCARP > 0 297 { .pr_type = SOCK_RAW, 298 .pr_domain = &inet6domain, 299 .pr_protocol = IPPROTO_CARP, 300 .pr_flags = PR_ATOMIC|PR_ADDR, 301 .pr_input = carp6_proto_input, 302 .pr_output = rip6_output, 303 .pr_ctloutput = rip6_ctloutput, 304 .pr_usrreq = rip6_usrreq, 305 }, 306 #endif /* NCARP */ 307 #ifdef ISO 308 { .pr_type = SOCK_RAW, 309 .pr_domain = &inet6domain, 310 .pr_protocol = IPPROTO_EON, 311 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 312 .pr_input = encap6_input, 313 .pr_output = rip6_output, 314 .pr_ctlinput = encap6_ctlinput, 315 .pr_ctloutput = rip6_ctloutput, 316 .pr_usrreq = rip6_usrreq, 317 /*XXX*/ 318 .pr_init = encap_init, 319 }, 320 #endif 321 { .pr_type = SOCK_RAW, 322 .pr_domain = &inet6domain, 323 .pr_protocol = IPPROTO_PIM, 324 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 325 .pr_input = pim6_input, 326 .pr_output = rip6_output, 327 .pr_ctloutput = rip6_ctloutput, 328 .pr_usrreq = rip6_usrreq, 329 }, 330 /* raw wildcard */ 331 { .pr_type = SOCK_RAW, 332 .pr_domain = &inet6domain, 333 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 334 .pr_input = rip6_input, 335 .pr_output = rip6_output, 336 .pr_ctloutput = rip6_ctloutput, 337 .pr_usrreq = rip6_usrreq, 338 .pr_init = rip6_init, 339 }, 340 }; 341 342 struct domain inet6domain = { 343 .dom_family = AF_INET6, .dom_name = "internet6", 344 .dom_init = NULL, .dom_externalize = NULL, .dom_dispose = NULL, 345 .dom_protosw = (const struct protosw *)inet6sw, 346 .dom_protoswNPROTOSW = (const struct protosw *)&inet6sw[sizeof(inet6sw)/sizeof(inet6sw[0])], 347 .dom_rtattach = rn_inithead, 348 .dom_rtoffset = offsetof(struct sockaddr_in6, sin6_addr) << 3, 349 .dom_maxrtkey = sizeof(struct sockaddr_in6), 350 .dom_ifattach = in6_domifattach, .dom_ifdetach = in6_domifdetach, 351 .dom_ifqueues = { &ip6intrq, NULL }, 352 .dom_link = { NULL }, 353 .dom_mowner = MOWNER_INIT("","") 354 }; 355 356 /* 357 * Internet configuration info 358 */ 359 #ifndef IPV6FORWARDING 360 #ifdef GATEWAY6 361 #define IPV6FORWARDING 1 /* forward IP6 packets not for us */ 362 #else 363 #define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */ 364 #endif /* GATEWAY6 */ 365 #endif /* !IPV6FORWARDING */ 366 367 int ip6_forwarding = IPV6FORWARDING; /* act as router? */ 368 int ip6_sendredirects = 1; 369 int ip6_defhlim = IPV6_DEFHLIM; 370 int ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS; 371 int ip6_accept_rtadv = 0; /* "IPV6FORWARDING ? 0 : 1" is dangerous */ 372 int ip6_maxfragpackets = 200; 373 int ip6_maxfrags = 200; 374 int ip6_log_interval = 5; 375 int ip6_hdrnestlimit = 50; /* appropriate? */ 376 int ip6_dad_count = 1; /* DupAddrDetectionTransmits */ 377 int ip6_auto_flowlabel = 1; 378 int ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */ 379 int ip6_rr_prune = 5; /* router renumbering prefix 380 * walk list every 5 sec. */ 381 int ip6_mcast_pmtu = 0; /* enable pMTU discovery for multicast? */ 382 int ip6_v6only = 1; 383 384 int ip6_keepfaith = 0; 385 time_t ip6_log_time = (time_t)0L; 386 387 /* icmp6 */ 388 /* 389 * BSDI4 defines these variables in in_proto.c... 390 * XXX: what if we don't define INET? Should we define pmtu6_expire 391 * or so? (jinmei (at) kame.net 19990310) 392 */ 393 int pmtu_expire = 60*10; 394 395 /* raw IP6 parameters */ 396 /* 397 * Nominal space allocated to a raw ip socket. 398 */ 399 #define RIPV6SNDQ 8192 400 #define RIPV6RCVQ 8192 401 402 u_long rip6_sendspace = RIPV6SNDQ; 403 u_long rip6_recvspace = RIPV6RCVQ; 404 405 /* ICMPV6 parameters */ 406 int icmp6_rediraccept = 1; /* accept and process redirects */ 407 int icmp6_redirtimeout = 10 * 60; /* 10 minutes */ 408 int icmp6errppslim = 100; /* 100pps */ 409 int icmp6_nodeinfo = 1; /* enable/disable NI response */ 410 411 /* UDP on IP6 parameters */ 412 int udp6_sendspace = 9216; /* really max datagram size */ 413 int udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6)); 414 /* 40 1K datagrams */ 415
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