1 /* $NetBSD: in6_proto.c,v 1.100 2014/01/02 18:29:01 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 1.100 2014/01/02 18:29:01 pooka Exp $"); 66 67 #include "opt_gateway.h" 68 #include "opt_inet.h" 69 #include "opt_ipsec.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 <netipsec/ipsec.h> 111 #include <netipsec/ipsec6.h> 112 #include <netipsec/key.h> 113 #endif /* IPSEC */ 114 115 116 #include "carp.h" 117 #if NCARP > 0 118 #include <netinet/ip_carp.h> 119 #endif 120 121 #include "etherip.h" 122 #if NETHERIP > 0 123 #include <netinet6/ip6_etherip.h> 124 #endif 125 126 #include <netinet6/ip6protosw.h> 127 128 #include <net/net_osdep.h> 129 130 /* 131 * TCP/IP protocol family: IP6, ICMP6, UDP, TCP. 132 */ 133 134 DOMAIN_DEFINE(inet6domain); /* forward declare and add to link set */ 135 136 /* Wrappers to acquire kernel_lock. */ 137 138 PR_WRAP_USRREQ(rip6_usrreq) 139 PR_WRAP_USRREQ(udp6_usrreq) 140 PR_WRAP_USRREQ(tcp_usrreq) 141 142 #define rip6_usrreq rip6_usrreq_wrapper 143 #define udp6_usrreq udp6_usrreq_wrapper 144 #define tcp_usrreq tcp_usrreq_wrapper 145 146 PR_WRAP_CTLINPUT(rip6_ctlinput) 147 PR_WRAP_CTLINPUT(encap6_ctlinput) 148 PR_WRAP_CTLINPUT(udp6_ctlinput) 149 PR_WRAP_CTLINPUT(tcp6_ctlinput) 150 151 #define rip6_ctlinput rip6_ctlinput_wrapper 152 #define encap6_ctlinput encap6_ctlinput_wrapper 153 #define udp6_ctlinput udp6_ctlinput_wrapper 154 #define tcp6_ctlinput tcp6_ctlinput_wrapper 155 156 PR_WRAP_CTLOUTPUT(rip6_ctloutput) 157 PR_WRAP_CTLOUTPUT(tcp_ctloutput) 158 PR_WRAP_CTLOUTPUT(udp6_ctloutput) 159 PR_WRAP_CTLOUTPUT(icmp6_ctloutput) 160 161 #define rip6_ctloutput rip6_ctloutput_wrapper 162 #define tcp_ctloutput tcp_ctloutput_wrapper 163 #define udp6_ctloutput udp6_ctloutput_wrapper 164 #define icmp6_ctloutput icmp6_ctloutput_wrapper 165 166 #if defined(IPSEC) 167 PR_WRAP_CTLINPUT(ah6_ctlinput) 168 169 #define ah6_ctlinput ah6_ctlinput_wrapper 170 #endif 171 172 #if defined(IPSEC) 173 PR_WRAP_CTLINPUT(esp6_ctlinput) 174 175 #define esp6_ctlinput esp6_ctlinput_wrapper 176 #endif 177 178 static void 179 tcp6_init(void) 180 { 181 182 icmp6_mtudisc_callback_register(tcp6_mtudisc_callback); 183 184 tcp_init_common(sizeof(struct ip6_hdr)); 185 } 186 187 const struct ip6protosw inet6sw[] = { 188 { .pr_domain = &inet6domain, 189 .pr_protocol = IPPROTO_IPV6, 190 .pr_init = ip6_init, 191 .pr_fasttimo = frag6_fasttimo, 192 .pr_slowtimo = frag6_slowtimo, 193 .pr_drain = frag6_drainstub, 194 }, 195 { .pr_type = SOCK_DGRAM, 196 .pr_domain = &inet6domain, 197 .pr_protocol = IPPROTO_UDP, 198 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 199 .pr_input = udp6_input, 200 .pr_ctlinput = udp6_ctlinput, 201 .pr_ctloutput = udp6_ctloutput, 202 .pr_usrreq = udp6_usrreq, 203 .pr_init = udp6_init, 204 }, 205 { .pr_type = SOCK_STREAM, 206 .pr_domain = &inet6domain, 207 .pr_protocol = IPPROTO_TCP, 208 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS|PR_PURGEIF, 209 .pr_input = tcp6_input, 210 .pr_ctlinput = tcp6_ctlinput, 211 .pr_ctloutput = tcp_ctloutput, 212 .pr_usrreq = tcp_usrreq, 213 .pr_init = tcp6_init, 214 .pr_fasttimo = tcp_fasttimo, 215 .pr_drain = tcp_drainstub, 216 }, 217 { .pr_type = SOCK_RAW, 218 .pr_domain = &inet6domain, 219 .pr_protocol = IPPROTO_RAW, 220 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 221 .pr_input = rip6_input, 222 .pr_output = rip6_output, 223 .pr_ctlinput = rip6_ctlinput, 224 .pr_ctloutput = rip6_ctloutput, 225 .pr_usrreq = rip6_usrreq, 226 }, 227 #ifdef GATEWAY 228 { .pr_domain = &inet6domain, 229 .pr_protocol = IPPROTO_IPV6, 230 .pr_slowtimo = ip6flow_slowtimo, 231 .pr_init = ip6flow_poolinit, 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 = ipsec6_common_input, 269 .pr_ctlinput = ah6_ctlinput, 270 }, 271 { .pr_type = SOCK_RAW, 272 .pr_domain = &inet6domain, 273 .pr_protocol = IPPROTO_ESP, 274 .pr_flags = PR_ATOMIC|PR_ADDR, 275 .pr_input = ipsec6_common_input, 276 .pr_ctlinput = esp6_ctlinput, 277 }, 278 { .pr_type = SOCK_RAW, 279 .pr_domain = &inet6domain, 280 .pr_protocol = IPPROTO_IPCOMP, 281 .pr_flags = PR_ATOMIC|PR_ADDR, 282 .pr_input = ipsec6_common_input, 283 }, 284 #endif /* IPSEC */ 285 #ifdef INET 286 { .pr_type = SOCK_RAW, 287 .pr_domain = &inet6domain, 288 .pr_protocol = IPPROTO_IPV4, 289 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 290 .pr_input = encap6_input, 291 .pr_output = rip6_output, 292 .pr_ctlinput = encap6_ctlinput, 293 .pr_ctloutput = rip6_ctloutput, 294 .pr_usrreq = rip6_usrreq, 295 .pr_init = encap_init, 296 }, 297 #endif 298 { .pr_type = SOCK_RAW, 299 .pr_domain = &inet6domain, 300 .pr_protocol = IPPROTO_IPV6, 301 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 302 .pr_input = encap6_input, 303 .pr_output = rip6_output, 304 .pr_ctlinput = encap6_ctlinput, 305 .pr_ctloutput = rip6_ctloutput, 306 .pr_usrreq = rip6_usrreq, 307 .pr_init = encap_init, 308 }, 309 #if NETHERIP > 0 310 { .pr_type = SOCK_RAW, 311 .pr_domain = &inet6domain, 312 .pr_protocol = IPPROTO_ETHERIP, 313 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 314 .pr_input = ip6_etherip_input, 315 .pr_output = rip6_output, 316 .pr_ctlinput = rip6_ctlinput, 317 .pr_ctloutput = rip6_ctloutput, 318 .pr_usrreq = rip6_usrreq, 319 }, 320 #endif 321 #if NCARP > 0 322 { .pr_type = SOCK_RAW, 323 .pr_domain = &inet6domain, 324 .pr_protocol = IPPROTO_CARP, 325 .pr_flags = PR_ATOMIC|PR_ADDR, 326 .pr_input = carp6_proto_input, 327 .pr_output = rip6_output, 328 .pr_ctloutput = rip6_ctloutput, 329 .pr_usrreq = rip6_usrreq, 330 }, 331 #endif /* NCARP */ 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 .pr_init = pim6_init, 341 }, 342 /* raw wildcard */ 343 { .pr_type = SOCK_RAW, 344 .pr_domain = &inet6domain, 345 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 346 .pr_input = rip6_input, 347 .pr_output = rip6_output, 348 .pr_ctloutput = rip6_ctloutput, 349 .pr_usrreq = rip6_usrreq, 350 .pr_init = rip6_init, 351 }, 352 }; 353 354 static const struct sockaddr_in6 in6_any = { 355 .sin6_len = sizeof(in6_any) 356 , .sin6_family = AF_INET6 357 , .sin6_port = 0 358 , .sin6_flowinfo = 0 359 , .sin6_addr = IN6ADDR_ANY_INIT 360 , .sin6_scope_id = 0 361 }; 362 363 bool in6_present = false; 364 static void 365 in6_init(void) 366 { 367 368 in6_present = true; 369 } 370 371 struct domain inet6domain = { 372 .dom_family = AF_INET6, .dom_name = "internet6", 373 .dom_init = in6_init, .dom_externalize = NULL, .dom_dispose = NULL, 374 .dom_protosw = (const struct protosw *)inet6sw, 375 .dom_protoswNPROTOSW = (const struct protosw *)&inet6sw[sizeof(inet6sw)/sizeof(inet6sw[0])], 376 .dom_rtattach = rt_inithead, 377 .dom_rtoffset = offsetof(struct sockaddr_in6, sin6_addr) << 3, 378 .dom_maxrtkey = sizeof(struct ip_pack6), 379 .dom_ifattach = in6_domifattach, .dom_ifdetach = in6_domifdetach, 380 .dom_ifqueues = { &ip6intrq, NULL }, 381 .dom_link = { NULL }, 382 .dom_mowner = MOWNER_INIT("",""), 383 .dom_sa_cmpofs = offsetof(struct sockaddr_in6, sin6_addr), 384 .dom_sa_cmplen = sizeof(struct in6_addr), 385 .dom_sa_any = (const struct sockaddr *)&in6_any, 386 .dom_sockaddr_externalize = sockaddr_in6_externalize, 387 .dom_rtcache = LIST_HEAD_INITIALIZER(inet6domain.dom_rtcache) 388 }; 389 390 #if 0 391 int 392 sockaddr_in6_cmp(const struct sockaddr *lsa, const struct sockaddr *rsa) 393 { 394 uint_fast8_t len; 395 const uint_fast8_t addrofs = offsetof(struct sockaddr_in6, sin6_addr), 396 addrend = addrofs + sizeof(struct in6_addr); 397 int rc; 398 const struct sockaddr_in6 *lsin6, *rsin6; 399 400 lsin6 = satocsin6(lsa); 401 rsin6 = satocsin6(rsa); 402 403 len = MIN(addrend, MIN(lsin6->sin6_len, rsin6->sin6_len)); 404 405 if (len > addrofs && 406 (rc = memcmp(&lsin6->sin6_addr, &rsin6->sin6_addr, 407 len - addrofs)) != 0) 408 return rc; 409 410 return lsin6->sin6_len - rsin6->sin6_len; 411 } 412 #endif 413 414 /* 415 * Internet configuration info 416 */ 417 #ifndef IPV6FORWARDING 418 #ifdef GATEWAY6 419 #define IPV6FORWARDING 1 /* forward IP6 packets not for us */ 420 #else 421 #define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */ 422 #endif /* GATEWAY6 */ 423 #endif /* !IPV6FORWARDING */ 424 425 int ip6_forwarding = IPV6FORWARDING; /* act as router? */ 426 int ip6_sendredirects = 1; 427 int ip6_defhlim = IPV6_DEFHLIM; 428 int ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS; 429 int ip6_accept_rtadv = 0; /* "IPV6FORWARDING ? 0 : 1" is dangerous */ 430 int ip6_maxfragpackets = 200; 431 int ip6_maxfrags = 200; 432 int ip6_log_interval = 5; 433 int ip6_hdrnestlimit = 50; /* appropriate? */ 434 int ip6_dad_count = 1; /* DupAddrDetectionTransmits */ 435 int ip6_auto_flowlabel = 1; 436 int ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */ 437 int ip6_rr_prune = 5; /* router renumbering prefix 438 * walk list every 5 sec. */ 439 int ip6_mcast_pmtu = 0; /* enable pMTU discovery for multicast? */ 440 int ip6_v6only = 1; 441 int ip6_neighborgcthresh = 2048; /* Threshold # of NDP entries for GC */ 442 int ip6_maxifprefixes = 16; /* Max acceptable prefixes via RA per IF */ 443 int ip6_maxifdefrouters = 16; /* Max acceptable def routers via RA */ 444 int ip6_maxdynroutes = 4096; /* Max # of routes created via redirect */ 445 446 int ip6_keepfaith = 0; 447 time_t ip6_log_time = 0; 448 int ip6_rtadv_maxroutes = 100; /* (arbitrary) initial maximum number of 449 * routes via rtadv expected to be 450 * significantly larger than common use. 451 * if you need to count: 3 extra initial 452 * routes, plus 1 per interface after the 453 * first one, then one per non-linklocal 454 * prefix */ 455 456 /* icmp6 */ 457 /* 458 * BSDI4 defines these variables in in_proto.c... 459 * XXX: what if we don't define INET? Should we define pmtu6_expire 460 * or so? (jinmei@kame.net 19990310) 461 */ 462 int pmtu_expire = 60*10; 463 464 /* raw IP6 parameters */ 465 /* 466 * Nominal space allocated to a raw ip socket. 467 */ 468 #define RIPV6SNDQ 8192 469 #define RIPV6RCVQ 8192 470 471 u_long rip6_sendspace = RIPV6SNDQ; 472 u_long rip6_recvspace = RIPV6RCVQ; 473 474 /* ICMPV6 parameters */ 475 int icmp6_rediraccept = 1; /* accept and process redirects */ 476 int icmp6_redirtimeout = 10 * 60; /* 10 minutes */ 477 int icmp6errppslim = 100; /* 100pps */ 478 int icmp6_nodeinfo = 1; /* enable/disable NI response */ 479 480 /* UDP on IP6 parameters */ 481 int udp6_sendspace = 9216; /* really max datagram size */ 482 int udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6)); 483 /* 40 1K datagrams */ 484