icmp6.c revision 1.192.2.3
1 /* $NetBSD: icmp6.c,v 1.192.2.3 2016/11/04 14:49:21 pgoyette Exp $ */ 2 /* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei 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, 1988, 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 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: icmp6.c,v 1.192.2.3 2016/11/04 14:49:21 pgoyette Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_inet.h" 69 #include "opt_ipsec.h" 70 #endif 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/kmem.h> 75 #include <sys/mbuf.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/time.h> 80 #include <sys/kernel.h> 81 #include <sys/syslog.h> 82 #include <sys/domain.h> 83 #include <sys/sysctl.h> 84 85 #include <net/if.h> 86 #include <net/route.h> 87 #include <net/if_dl.h> 88 #include <net/if_types.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <netinet/ip6.h> 93 #include <netinet6/ip6_var.h> 94 #include <netinet6/ip6_private.h> 95 #include <netinet/icmp6.h> 96 #include <netinet6/icmp6_private.h> 97 #include <netinet6/mld6_var.h> 98 #include <netinet6/in6_pcb.h> 99 #include <netinet6/nd6.h> 100 #include <netinet6/in6_ifattach.h> 101 #include <netinet6/ip6protosw.h> 102 #include <netinet6/scope6_var.h> 103 104 #ifdef IPSEC 105 #include <netipsec/ipsec.h> 106 #include <netipsec/key.h> 107 #endif 108 109 110 #include "faith.h" 111 #if defined(NFAITH) && 0 < NFAITH 112 #include <net/if_faith.h> 113 #endif 114 115 #include <net/net_osdep.h> 116 117 extern struct domain inet6domain; 118 119 percpu_t *icmp6stat_percpu; 120 121 extern struct inpcbtable raw6cbtable; 122 extern int icmp6errppslim; 123 static int icmp6errpps_count = 0; 124 static struct timeval icmp6errppslim_last; 125 extern int icmp6_nodeinfo; 126 127 /* 128 * List of callbacks to notify when Path MTU changes are made. 129 */ 130 struct icmp6_mtudisc_callback { 131 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 132 void (*mc_func)(struct in6_addr *); 133 }; 134 135 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 136 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 137 138 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 139 extern int pmtu_expire; 140 141 /* XXX do these values make any sense? */ 142 static int icmp6_mtudisc_hiwat = 1280; 143 static int icmp6_mtudisc_lowat = 256; 144 145 /* 146 * keep track of # of redirect routes. 147 */ 148 static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 149 150 /* XXX experimental, turned off */ 151 static int icmp6_redirect_hiwat = -1; 152 static int icmp6_redirect_lowat = -1; 153 154 static void icmp6_errcount(u_int, int, int); 155 static int icmp6_rip6_input(struct mbuf **, int); 156 static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 157 static const char *icmp6_redirect_diag(struct in6_addr *, 158 struct in6_addr *, struct in6_addr *); 159 static struct mbuf *ni6_input(struct mbuf *, int); 160 static struct mbuf *ni6_nametodns(const char *, int, int); 161 static int ni6_dnsmatch(const char *, int, const char *, int); 162 static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *, 163 struct ifnet **, char *, struct psref *); 164 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 165 struct ifnet *, int); 166 static int icmp6_notify_error(struct mbuf *, int, int, int); 167 static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 168 static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 169 static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 170 static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 171 172 173 void 174 icmp6_init(void) 175 { 176 177 sysctl_net_inet6_icmp6_setup(NULL); 178 mld_init(); 179 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 180 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 181 182 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS); 183 } 184 185 static void 186 icmp6_errcount(u_int base, int type, int code) 187 { 188 switch (type) { 189 case ICMP6_DST_UNREACH: 190 switch (code) { 191 case ICMP6_DST_UNREACH_NOROUTE: 192 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE); 193 return; 194 case ICMP6_DST_UNREACH_ADMIN: 195 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN); 196 return; 197 case ICMP6_DST_UNREACH_BEYONDSCOPE: 198 ICMP6_STATINC(base + 199 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE); 200 return; 201 case ICMP6_DST_UNREACH_ADDR: 202 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR); 203 return; 204 case ICMP6_DST_UNREACH_NOPORT: 205 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT); 206 return; 207 } 208 break; 209 case ICMP6_PACKET_TOO_BIG: 210 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG); 211 return; 212 case ICMP6_TIME_EXCEEDED: 213 switch (code) { 214 case ICMP6_TIME_EXCEED_TRANSIT: 215 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT); 216 return; 217 case ICMP6_TIME_EXCEED_REASSEMBLY: 218 ICMP6_STATINC(base + 219 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY); 220 return; 221 } 222 break; 223 case ICMP6_PARAM_PROB: 224 switch (code) { 225 case ICMP6_PARAMPROB_HEADER: 226 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER); 227 return; 228 case ICMP6_PARAMPROB_NEXTHEADER: 229 ICMP6_STATINC(base + 230 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER); 231 return; 232 case ICMP6_PARAMPROB_OPTION: 233 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION); 234 return; 235 } 236 break; 237 case ND_REDIRECT: 238 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT); 239 return; 240 } 241 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN); 242 } 243 244 /* 245 * Register a Path MTU Discovery callback. 246 */ 247 void 248 icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *)) 249 { 250 struct icmp6_mtudisc_callback *mc; 251 252 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 253 mc = LIST_NEXT(mc, mc_list)) { 254 if (mc->mc_func == func) 255 return; 256 } 257 258 mc = kmem_alloc(sizeof(*mc), KM_SLEEP); 259 mc->mc_func = func; 260 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, mc, mc_list); 261 } 262 263 /* 264 * A wrapper function for icmp6_error() necessary when the erroneous packet 265 * may not contain enough scope zone information. 266 */ 267 void 268 icmp6_error2(struct mbuf *m, int type, int code, int param, 269 struct ifnet *ifp) 270 { 271 struct ip6_hdr *ip6; 272 273 if (ifp == NULL) 274 return; 275 276 if (m->m_len < sizeof(struct ip6_hdr)) { 277 m = m_pullup(m, sizeof(struct ip6_hdr)); 278 if (m == NULL) 279 return; 280 } 281 282 ip6 = mtod(m, struct ip6_hdr *); 283 284 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 285 return; 286 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 287 return; 288 289 icmp6_error(m, type, code, param); 290 } 291 292 /* 293 * Generate an error packet of type error in response to bad IP6 packet. 294 */ 295 void 296 icmp6_error(struct mbuf *m, int type, int code, int param) 297 { 298 struct ip6_hdr *oip6, *nip6; 299 struct icmp6_hdr *icmp6; 300 u_int preplen; 301 int off; 302 int nxt; 303 304 ICMP6_STATINC(ICMP6_STAT_ERROR); 305 306 /* count per-type-code statistics */ 307 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); 308 309 if (m->m_flags & M_DECRYPTED) { 310 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 311 goto freeit; 312 } 313 314 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && 315 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) 316 return; 317 oip6 = mtod(m, struct ip6_hdr *); 318 319 /* 320 * If the destination address of the erroneous packet is a multicast 321 * address, or the packet was sent using link-layer multicast, 322 * we should basically suppress sending an error (RFC 2463, Section 323 * 2.4). 324 * We have two exceptions (the item e.2 in that section): 325 * - the Pakcet Too Big message can be sent for path MTU discovery. 326 * - the Parameter Problem Message that can be allowed an icmp6 error 327 * in the option type field. This check has been done in 328 * ip6_unknown_opt(), so we can just check the type and code. 329 */ 330 if ((m->m_flags & (M_BCAST|M_MCAST) || 331 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 332 (type != ICMP6_PACKET_TOO_BIG && 333 (type != ICMP6_PARAM_PROB || 334 code != ICMP6_PARAMPROB_OPTION))) 335 goto freeit; 336 337 /* 338 * RFC 2463, 2.4 (e.5): source address check. 339 * XXX: the case of anycast source? 340 */ 341 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 342 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 343 goto freeit; 344 345 /* 346 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 347 * don't do it. 348 */ 349 nxt = -1; 350 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 351 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 352 struct icmp6_hdr *icp; 353 354 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 355 sizeof(*icp)); 356 if (icp == NULL) { 357 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 358 return; 359 } 360 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 361 icp->icmp6_type == ND_REDIRECT) { 362 /* 363 * ICMPv6 error 364 * Special case: for redirect (which is 365 * informational) we must not send icmp6 error. 366 */ 367 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 368 goto freeit; 369 } else { 370 /* ICMPv6 informational - send the error */ 371 } 372 } 373 #if 0 /* controversial */ 374 else if (off >= 0 && nxt == IPPROTO_ESP) { 375 /* 376 * It could be ICMPv6 error inside ESP. Take a safer side, 377 * don't respond. 378 */ 379 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 380 goto freeit; 381 } 382 #endif 383 else { 384 /* non-ICMPv6 - send the error */ 385 } 386 387 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 388 389 /* Finally, do rate limitation check. */ 390 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 391 ICMP6_STATINC(ICMP6_STAT_TOOFREQ); 392 goto freeit; 393 } 394 395 /* 396 * OK, ICMP6 can be generated. 397 */ 398 399 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 400 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 401 402 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 403 M_PREPEND(m, preplen, M_DONTWAIT); 404 if (m && M_UNWRITABLE(m, preplen)) 405 m = m_pullup(m, preplen); 406 if (m == NULL) { 407 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__); 408 return; 409 } 410 411 nip6 = mtod(m, struct ip6_hdr *); 412 nip6->ip6_src = oip6->ip6_src; 413 nip6->ip6_dst = oip6->ip6_dst; 414 415 in6_clearscope(&oip6->ip6_src); 416 in6_clearscope(&oip6->ip6_dst); 417 418 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 419 icmp6->icmp6_type = type; 420 icmp6->icmp6_code = code; 421 icmp6->icmp6_pptr = htonl((u_int32_t)param); 422 423 /* 424 * icmp6_reflect() is designed to be in the input path. 425 * icmp6_error() can be called from both input and output path, 426 * and if we are in output path rcvif could contain bogus value. 427 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 428 * information in ip header (nip6). 429 */ 430 m_reset_rcvif(m); 431 432 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 433 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 434 435 return; 436 437 freeit: 438 /* 439 * If we can't tell whether or not we can generate ICMP6, free it. 440 */ 441 m_freem(m); 442 } 443 444 /* 445 * Process a received ICMP6 message. 446 */ 447 int 448 icmp6_input(struct mbuf **mp, int *offp, int proto) 449 { 450 struct mbuf *m = *mp, *n; 451 struct ip6_hdr *ip6, *nip6; 452 struct icmp6_hdr *icmp6, *nicmp6; 453 int off = *offp; 454 int icmp6len = m->m_pkthdr.len - *offp; 455 int code, sum, noff, i; 456 struct ifnet *rcvif; 457 struct psref psref; 458 459 rcvif = m_get_rcvif_psref(m, &psref); 460 if (__predict_false(rcvif == NULL)) 461 goto freeit; 462 463 #define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 464 KASSERT(ICMP6_MAXLEN < MCLBYTES); 465 icmp6_ifstat_inc(rcvif, ifs6_in_msg); 466 467 /* 468 * Locate icmp6 structure in mbuf, and check 469 * that not corrupted and of at least minimum length 470 */ 471 472 if (icmp6len < sizeof(struct icmp6_hdr)) { 473 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 474 icmp6_ifstat_inc(rcvif, ifs6_in_error); 475 goto freeit; 476 } 477 478 i = off + sizeof(*icmp6); 479 if ((m->m_len < i || M_READONLY(m)) && (m = m_pullup(m, i)) == 0) { 480 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 481 #if 0 /* m is 0 here */ 482 icmp6_ifstat_inc(rcvif, ifs6_in_error); 483 #endif 484 goto freeit; 485 } 486 ip6 = mtod(m, struct ip6_hdr *); 487 /* 488 * calculate the checksum 489 */ 490 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 491 if (icmp6 == NULL) { 492 m_put_rcvif_psref(rcvif, &psref); 493 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 494 /* m is invalid */ 495 /*icmp6_ifstat_inc(rcvif, ifs6_in_error);*/ 496 return IPPROTO_DONE; 497 } 498 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 499 code = icmp6->icmp6_code; 500 501 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 502 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 503 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)); 504 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 505 icmp6_ifstat_inc(rcvif, ifs6_in_error); 506 goto freeit; 507 } 508 509 #if defined(NFAITH) && 0 < NFAITH 510 if (faithprefix(&ip6->ip6_dst)) { 511 /* 512 * Deliver very specific ICMP6 type only. 513 * This is important to deliver TOOBIG. Otherwise PMTUD 514 * will not work. 515 */ 516 switch (icmp6->icmp6_type) { 517 case ICMP6_DST_UNREACH: 518 case ICMP6_PACKET_TOO_BIG: 519 case ICMP6_TIME_EXCEEDED: 520 break; 521 default: 522 goto freeit; 523 } 524 } 525 #endif 526 527 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 528 529 switch (icmp6->icmp6_type) { 530 case ICMP6_DST_UNREACH: 531 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 532 switch (code) { 533 case ICMP6_DST_UNREACH_NOROUTE: 534 code = PRC_UNREACH_NET; 535 break; 536 case ICMP6_DST_UNREACH_ADMIN: 537 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 538 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 539 break; 540 case ICMP6_DST_UNREACH_ADDR: 541 code = PRC_HOSTDEAD; 542 break; 543 #ifdef COMPAT_RFC1885 544 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 545 code = PRC_UNREACH_SRCFAIL; 546 break; 547 #else 548 case ICMP6_DST_UNREACH_BEYONDSCOPE: 549 /* I mean "source address was incorrect." */ 550 code = PRC_UNREACH_NET; 551 break; 552 #endif 553 case ICMP6_DST_UNREACH_NOPORT: 554 code = PRC_UNREACH_PORT; 555 break; 556 default: 557 goto badcode; 558 } 559 goto deliver; 560 561 case ICMP6_PACKET_TOO_BIG: 562 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 563 564 /* 565 * MTU is checked in icmp6_mtudisc. 566 */ 567 code = PRC_MSGSIZE; 568 569 /* 570 * Updating the path MTU will be done after examining 571 * intermediate extension headers. 572 */ 573 goto deliver; 574 575 case ICMP6_TIME_EXCEEDED: 576 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 577 switch (code) { 578 case ICMP6_TIME_EXCEED_TRANSIT: 579 code = PRC_TIMXCEED_INTRANS; 580 break; 581 case ICMP6_TIME_EXCEED_REASSEMBLY: 582 code = PRC_TIMXCEED_REASS; 583 break; 584 default: 585 goto badcode; 586 } 587 goto deliver; 588 589 case ICMP6_PARAM_PROB: 590 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 591 switch (code) { 592 case ICMP6_PARAMPROB_NEXTHEADER: 593 code = PRC_UNREACH_PROTOCOL; 594 break; 595 case ICMP6_PARAMPROB_HEADER: 596 case ICMP6_PARAMPROB_OPTION: 597 code = PRC_PARAMPROB; 598 break; 599 default: 600 goto badcode; 601 } 602 goto deliver; 603 604 case ICMP6_ECHO_REQUEST: 605 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 606 if (code != 0) 607 goto badcode; 608 /* 609 * Copy mbuf to send to two data paths: userland socket(s), 610 * and to the querier (echo reply). 611 * m: a copy for socket, n: a copy for querier 612 * 613 * If the first mbuf is shared, or the first mbuf is too short, 614 * copy the first part of the data into a fresh mbuf. 615 * Otherwise, we will wrongly overwrite both copies. 616 */ 617 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 618 /* Give up local */ 619 n = m; 620 m = NULL; 621 } else if (M_READONLY(n) || 622 n->m_len < off + sizeof(struct icmp6_hdr)) { 623 struct mbuf *n0 = n; 624 625 /* 626 * Prepare an internal mbuf. m_pullup() doesn't 627 * always copy the length we specified. 628 */ 629 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 630 /* Give up local */ 631 n = m; 632 m = NULL; 633 } 634 m_freem(n0); 635 } 636 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 637 sizeof(*nicmp6)); 638 if (nicmp6 == NULL) 639 goto freeit; 640 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 641 nicmp6->icmp6_code = 0; 642 if (n) { 643 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 644 icmp6s[ICMP6_STAT_REFLECT]++; 645 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 646 ICMP6_STAT_PUTREF(); 647 icmp6_reflect(n, off); 648 } 649 if (!m) 650 goto freeit; 651 break; 652 653 case ICMP6_ECHO_REPLY: 654 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 655 if (code != 0) 656 goto badcode; 657 break; 658 659 case MLD_LISTENER_QUERY: 660 case MLD_LISTENER_REPORT: 661 if (icmp6len < sizeof(struct mld_hdr)) 662 goto badlen; 663 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 664 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 665 else 666 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 667 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 668 /* give up local */ 669 mld_input(m, off); 670 m = NULL; 671 goto freeit; 672 } 673 mld_input(n, off); 674 /* m stays. */ 675 break; 676 677 case MLD_LISTENER_DONE: 678 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 679 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 680 goto badlen; 681 break; /* nothing to be done in kernel */ 682 683 case MLD_MTRACE_RESP: 684 case MLD_MTRACE: 685 /* XXX: these two are experimental. not officially defined. */ 686 /* XXX: per-interface statistics? */ 687 break; /* just pass it to applications */ 688 689 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 690 { 691 enum { WRU, FQDN } mode; 692 693 if (!icmp6_nodeinfo) 694 break; 695 696 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 697 mode = WRU; 698 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 699 mode = FQDN; 700 else 701 goto badlen; 702 703 if (mode == FQDN) { 704 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 705 if (n) 706 n = ni6_input(n, off); 707 /* XXX meaningless if n == NULL */ 708 noff = sizeof(struct ip6_hdr); 709 } else { 710 u_char *p; 711 int maxhlen; 712 713 if ((icmp6_nodeinfo & 5) != 5) 714 break; 715 716 if (code != 0) 717 goto badcode; 718 MGETHDR(n, M_DONTWAIT, m->m_type); 719 if (n && ICMP6_MAXLEN > MHLEN) { 720 MCLGET(n, M_DONTWAIT); 721 if ((n->m_flags & M_EXT) == 0) { 722 m_free(n); 723 n = NULL; 724 } 725 } 726 if (n == NULL) { 727 /* Give up remote */ 728 break; 729 } 730 m_reset_rcvif(n); 731 n->m_len = 0; 732 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 733 if (maxhlen < 0) 734 break; 735 if (maxhlen > hostnamelen) 736 maxhlen = hostnamelen; 737 /* 738 * Copy IPv6 and ICMPv6 only. 739 */ 740 nip6 = mtod(n, struct ip6_hdr *); 741 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 742 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 743 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 744 p = (u_char *)(nicmp6 + 1); 745 memset(p, 0, 4); 746 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 747 noff = sizeof(struct ip6_hdr); 748 M_COPY_PKTHDR(n, m); /* just for rcvif */ 749 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 750 sizeof(struct icmp6_hdr) + 4 + maxhlen; 751 nicmp6->icmp6_type = ICMP6_WRUREPLY; 752 nicmp6->icmp6_code = 0; 753 } 754 #undef hostnamelen 755 if (n) { 756 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 757 icmp6s[ICMP6_STAT_REFLECT]++; 758 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 759 ICMP6_STAT_PUTREF(); 760 icmp6_reflect(n, noff); 761 } 762 break; 763 } 764 765 case ICMP6_WRUREPLY: 766 if (code != 0) 767 goto badcode; 768 break; 769 770 case ND_ROUTER_SOLICIT: 771 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 772 if (code != 0) 773 goto badcode; 774 if (icmp6len < sizeof(struct nd_router_solicit)) 775 goto badlen; 776 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 777 /* give up local */ 778 nd6_rs_input(m, off, icmp6len); 779 m = NULL; 780 goto freeit; 781 } 782 nd6_rs_input(n, off, icmp6len); 783 /* m stays. */ 784 break; 785 786 case ND_ROUTER_ADVERT: 787 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 788 if (code != 0) 789 goto badcode; 790 if (icmp6len < sizeof(struct nd_router_advert)) 791 goto badlen; 792 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 793 /* give up local */ 794 nd6_ra_input(m, off, icmp6len); 795 m = NULL; 796 goto freeit; 797 } 798 nd6_ra_input(n, off, icmp6len); 799 /* m stays. */ 800 break; 801 802 case ND_NEIGHBOR_SOLICIT: 803 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 804 if (code != 0) 805 goto badcode; 806 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 807 goto badlen; 808 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 809 /* give up local */ 810 nd6_ns_input(m, off, icmp6len); 811 m = NULL; 812 goto freeit; 813 } 814 nd6_ns_input(n, off, icmp6len); 815 /* m stays. */ 816 break; 817 818 case ND_NEIGHBOR_ADVERT: 819 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 820 if (code != 0) 821 goto badcode; 822 if (icmp6len < sizeof(struct nd_neighbor_advert)) 823 goto badlen; 824 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 825 /* give up local */ 826 nd6_na_input(m, off, icmp6len); 827 m = NULL; 828 goto freeit; 829 } 830 nd6_na_input(n, off, icmp6len); 831 /* m stays. */ 832 break; 833 834 case ND_REDIRECT: 835 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 836 if (code != 0) 837 goto badcode; 838 if (icmp6len < sizeof(struct nd_redirect)) 839 goto badlen; 840 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 841 /* give up local */ 842 icmp6_redirect_input(m, off); 843 m = NULL; 844 goto freeit; 845 } 846 icmp6_redirect_input(n, off); 847 /* m stays. */ 848 break; 849 850 case ICMP6_ROUTER_RENUMBERING: 851 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 852 code != ICMP6_ROUTER_RENUMBERING_RESULT) 853 goto badcode; 854 if (icmp6len < sizeof(struct icmp6_router_renum)) 855 goto badlen; 856 break; 857 858 default: 859 nd6log(LOG_DEBUG, "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 860 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 861 ip6_sprintf(&ip6->ip6_dst), 862 rcvif ? rcvif->if_index : 0); 863 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 864 /* ICMPv6 error: MUST deliver it by spec... */ 865 code = PRC_NCMDS; 866 /* deliver */ 867 } else { 868 /* ICMPv6 informational: MUST not deliver */ 869 break; 870 } 871 deliver: 872 if (icmp6_notify_error(m, off, icmp6len, code)) { 873 /* In this case, m should've been freed. */ 874 m_put_rcvif_psref(rcvif, &psref); 875 return (IPPROTO_DONE); 876 } 877 break; 878 879 badcode: 880 ICMP6_STATINC(ICMP6_STAT_BADCODE); 881 break; 882 883 badlen: 884 ICMP6_STATINC(ICMP6_STAT_BADLEN); 885 break; 886 } 887 m_put_rcvif_psref(rcvif, &psref); 888 889 /* deliver the packet to appropriate sockets */ 890 icmp6_rip6_input(&m, *offp); 891 892 return IPPROTO_DONE; 893 894 freeit: 895 m_put_rcvif_psref(rcvif, &psref); 896 m_freem(m); 897 return IPPROTO_DONE; 898 } 899 900 static int 901 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 902 { 903 struct icmp6_hdr *icmp6; 904 struct ip6_hdr *eip6; 905 u_int32_t notifymtu; 906 struct sockaddr_in6 icmp6src, icmp6dst; 907 908 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 909 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 910 goto freeit; 911 } 912 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 913 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 914 if (icmp6 == NULL) { 915 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 916 return (-1); 917 } 918 eip6 = (struct ip6_hdr *)(icmp6 + 1); 919 920 /* Detect the upper level protocol */ 921 { 922 void (*ctlfunc)(int, struct sockaddr *, void *); 923 u_int8_t nxt = eip6->ip6_nxt; 924 int eoff = off + sizeof(struct icmp6_hdr) + 925 sizeof(struct ip6_hdr); 926 struct ip6ctlparam ip6cp; 927 struct in6_addr *finaldst = NULL; 928 int icmp6type = icmp6->icmp6_type; 929 struct ip6_frag *fh; 930 struct ip6_rthdr *rth; 931 struct ip6_rthdr0 *rth0; 932 int rthlen; 933 struct ifnet *rcvif; 934 int s; 935 936 while (1) { /* XXX: should avoid infinite loop explicitly? */ 937 struct ip6_ext *eh; 938 939 switch (nxt) { 940 case IPPROTO_HOPOPTS: 941 case IPPROTO_DSTOPTS: 942 case IPPROTO_AH: 943 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 944 eoff, sizeof(*eh)); 945 if (eh == NULL) { 946 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 947 return (-1); 948 } 949 950 if (nxt == IPPROTO_AH) 951 eoff += (eh->ip6e_len + 2) << 2; 952 else 953 eoff += (eh->ip6e_len + 1) << 3; 954 nxt = eh->ip6e_nxt; 955 break; 956 case IPPROTO_ROUTING: 957 /* 958 * When the erroneous packet contains a 959 * routing header, we should examine the 960 * header to determine the final destination. 961 * Otherwise, we can't properly update 962 * information that depends on the final 963 * destination (e.g. path MTU). 964 */ 965 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 966 eoff, sizeof(*rth)); 967 if (rth == NULL) { 968 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 969 return (-1); 970 } 971 rthlen = (rth->ip6r_len + 1) << 3; 972 /* 973 * XXX: currently there is no 974 * officially defined type other 975 * than type-0. 976 * Note that if the segment left field 977 * is 0, all intermediate hops must 978 * have been passed. 979 */ 980 if (rth->ip6r_segleft && 981 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 982 int hops; 983 984 IP6_EXTHDR_GET(rth0, 985 struct ip6_rthdr0 *, m, 986 eoff, rthlen); 987 if (rth0 == NULL) { 988 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 989 return (-1); 990 } 991 /* just ignore a bogus header */ 992 if ((rth0->ip6r0_len % 2) == 0 && 993 (hops = rth0->ip6r0_len/2)) 994 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 995 } 996 eoff += rthlen; 997 nxt = rth->ip6r_nxt; 998 break; 999 case IPPROTO_FRAGMENT: 1000 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1001 eoff, sizeof(*fh)); 1002 if (fh == NULL) { 1003 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1004 return (-1); 1005 } 1006 /* 1007 * Data after a fragment header is meaningless 1008 * unless it is the first fragment, but 1009 * we'll go to the notify label for path MTU 1010 * discovery. 1011 */ 1012 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1013 goto notify; 1014 1015 eoff += sizeof(struct ip6_frag); 1016 nxt = fh->ip6f_nxt; 1017 break; 1018 default: 1019 /* 1020 * This case includes ESP and the No Next 1021 * Header. In such cases going to the notify 1022 * label does not have any meaning 1023 * (i.e. ctlfunc will be NULL), but we go 1024 * anyway since we might have to update 1025 * path MTU information. 1026 */ 1027 goto notify; 1028 } 1029 } 1030 notify: 1031 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1032 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1033 if (icmp6 == NULL) { 1034 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1035 return (-1); 1036 } 1037 1038 /* 1039 * retrieve parameters from the inner IPv6 header, and convert 1040 * them into sockaddr structures. 1041 * XXX: there is no guarantee that the source or destination 1042 * addresses of the inner packet are in the same scope zone as 1043 * the addresses of the icmp packet. But there is no other 1044 * way to determine the zone. 1045 */ 1046 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1047 1048 rcvif = m_get_rcvif(m, &s); 1049 sockaddr_in6_init(&icmp6dst, 1050 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1051 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1052 m_put_rcvif(rcvif, &s); 1053 goto freeit; 1054 } 1055 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1056 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1057 m_put_rcvif(rcvif, &s); 1058 goto freeit; 1059 } 1060 m_put_rcvif(rcvif, &s); 1061 1062 icmp6src.sin6_flowinfo = 1063 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1064 1065 if (finaldst == NULL) 1066 finaldst = &eip6->ip6_dst; 1067 ip6cp.ip6c_m = m; 1068 ip6cp.ip6c_icmp6 = icmp6; 1069 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1070 ip6cp.ip6c_off = eoff; 1071 ip6cp.ip6c_finaldst = finaldst; 1072 ip6cp.ip6c_src = &icmp6src; 1073 ip6cp.ip6c_nxt = nxt; 1074 1075 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1076 notifymtu = ntohl(icmp6->icmp6_mtu); 1077 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1078 } 1079 1080 ctlfunc = (void (*)(int, struct sockaddr *, void *)) 1081 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1082 if (ctlfunc) { 1083 (void) (*ctlfunc)(code, sin6tosa(&icmp6dst), 1084 &ip6cp); 1085 } 1086 } 1087 return (0); 1088 1089 freeit: 1090 m_freem(m); 1091 return (-1); 1092 } 1093 1094 void 1095 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1096 { 1097 unsigned long rtcount; 1098 struct icmp6_mtudisc_callback *mc; 1099 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1100 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1101 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1102 u_int mtu = ntohl(icmp6->icmp6_mtu); 1103 struct rtentry *rt = NULL; 1104 struct sockaddr_in6 sin6; 1105 struct ifnet *rcvif; 1106 int s; 1107 1108 /* 1109 * The MTU should not be less than the minimal IPv6 MTU except for the 1110 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1111 * In that one case, the MTU might be less than 1280. 1112 */ 1113 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1114 /* is the mtu even sane? */ 1115 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1116 return; 1117 if (!validated) 1118 return; 1119 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1120 } 1121 1122 /* 1123 * allow non-validated cases if memory is plenty, to make traffic 1124 * from non-connected pcb happy. 1125 */ 1126 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1127 if (validated) { 1128 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) 1129 return; 1130 else if (0 <= icmp6_mtudisc_lowat && 1131 rtcount > icmp6_mtudisc_lowat) { 1132 /* 1133 * XXX nuke a victim, install the new one. 1134 */ 1135 } 1136 } else { 1137 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) 1138 return; 1139 } 1140 1141 memset(&sin6, 0, sizeof(sin6)); 1142 sin6.sin6_family = PF_INET6; 1143 sin6.sin6_len = sizeof(struct sockaddr_in6); 1144 sin6.sin6_addr = *dst; 1145 rcvif = m_get_rcvif(m, &s); 1146 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1147 m_put_rcvif(rcvif, &s); 1148 return; 1149 } 1150 m_put_rcvif(rcvif, &s); 1151 1152 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1153 1154 if (rt && (rt->rt_flags & RTF_HOST) && 1155 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1156 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1157 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1158 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1159 rt->rt_rmx.rmx_mtu = mtu; 1160 } 1161 } 1162 if (rt) { 1163 rtfree(rt); 1164 } 1165 1166 /* 1167 * Notify protocols that the MTU for this destination 1168 * has changed. 1169 */ 1170 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1171 mc = LIST_NEXT(mc, mc_list)) 1172 (*mc->mc_func)(&sin6.sin6_addr); 1173 } 1174 1175 /* 1176 * Process a Node Information Query packet, based on 1177 * draft-ietf-ipngwg-icmp-name-lookups-07. 1178 * 1179 * Spec incompatibilities: 1180 * - IPv6 Subject address handling 1181 * - IPv4 Subject address handling support missing 1182 * - Proxy reply (answer even if it's not for me) 1183 * - joins NI group address at in6_ifattach() time only, does not cope 1184 * with hostname changes by sethostname(3) 1185 */ 1186 static struct mbuf * 1187 ni6_input(struct mbuf *m, int off) 1188 { 1189 struct icmp6_nodeinfo *ni6, *nni6; 1190 struct mbuf *n = NULL; 1191 u_int16_t qtype; 1192 int subjlen; 1193 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1194 struct ni_reply_fqdn *fqdn; 1195 int addrs; /* for NI_QTYPE_NODEADDR */ 1196 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1197 struct sockaddr_in6 sin6; /* ip6_dst */ 1198 struct in6_addr in6_subj; /* subject address */ 1199 struct ip6_hdr *ip6; 1200 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1201 char *subj = NULL; 1202 struct ifnet *rcvif; 1203 int s, ss; 1204 struct ifaddr *ifa; 1205 struct psref psref; 1206 1207 ip6 = mtod(m, struct ip6_hdr *); 1208 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1209 if (ni6 == NULL) { 1210 /* m is already reclaimed */ 1211 return NULL; 1212 } 1213 1214 /* 1215 * Validate IPv6 destination address. 1216 * 1217 * The Responder must discard the Query without further processing 1218 * unless it is one of the Responder's unicast or anycast addresses, or 1219 * a link-local scope multicast address which the Responder has joined. 1220 * [icmp-name-lookups-07, Section 4.] 1221 */ 1222 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1223 /* XXX scopeid */ 1224 ss = pserialize_read_enter(); 1225 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1226 if (ifa != NULL) 1227 ; /* unicast/anycast, fine */ 1228 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1229 ; /* link-local multicast, fine */ 1230 else { 1231 pserialize_read_exit(ss); 1232 goto bad; 1233 } 1234 pserialize_read_exit(ss); 1235 1236 /* validate query Subject field. */ 1237 qtype = ntohs(ni6->ni_qtype); 1238 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1239 switch (qtype) { 1240 case NI_QTYPE_NOOP: 1241 case NI_QTYPE_SUPTYPES: 1242 /* 07 draft */ 1243 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1244 break; 1245 /* FALLTHROUGH */ 1246 case NI_QTYPE_FQDN: 1247 case NI_QTYPE_NODEADDR: 1248 case NI_QTYPE_IPV4ADDR: 1249 switch (ni6->ni_code) { 1250 case ICMP6_NI_SUBJ_IPV6: 1251 #if ICMP6_NI_SUBJ_IPV6 != 0 1252 case 0: 1253 #endif 1254 /* 1255 * backward compatibility - try to accept 03 draft 1256 * format, where no Subject is present. 1257 */ 1258 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1259 subjlen == 0) { 1260 oldfqdn++; 1261 break; 1262 } 1263 #if ICMP6_NI_SUBJ_IPV6 != 0 1264 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1265 goto bad; 1266 #endif 1267 1268 if (subjlen != sizeof(sin6.sin6_addr)) 1269 goto bad; 1270 1271 /* 1272 * Validate Subject address. 1273 * 1274 * Not sure what exactly "address belongs to the node" 1275 * means in the spec, is it just unicast, or what? 1276 * 1277 * At this moment we consider Subject address as 1278 * "belong to the node" if the Subject address equals 1279 * to the IPv6 destination address; validation for 1280 * IPv6 destination address should have done enough 1281 * check for us. 1282 * 1283 * We do not do proxy at this moment. 1284 */ 1285 /* m_pulldown instead of copy? */ 1286 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1287 subjlen, (void *)&in6_subj); 1288 rcvif = m_get_rcvif(m, &s); 1289 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1290 m_put_rcvif(rcvif, &s); 1291 goto bad; 1292 } 1293 m_put_rcvif(rcvif, &s); 1294 1295 subj = (char *)&in6_subj; 1296 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1297 break; 1298 1299 /* 1300 * XXX if we are to allow other cases, we should really 1301 * be careful about scope here. 1302 * basically, we should disallow queries toward IPv6 1303 * destination X with subject Y, if scope(X) > scope(Y). 1304 * if we allow scope(X) > scope(Y), it will result in 1305 * information leakage across scope boundary. 1306 */ 1307 goto bad; 1308 1309 case ICMP6_NI_SUBJ_FQDN: 1310 /* 1311 * Validate Subject name with gethostname(3). 1312 * 1313 * The behavior may need some debate, since: 1314 * - we are not sure if the node has FQDN as 1315 * hostname (returned by gethostname(3)). 1316 * - the code does wildcard match for truncated names. 1317 * however, we are not sure if we want to perform 1318 * wildcard match, if gethostname(3) side has 1319 * truncated hostname. 1320 */ 1321 n = ni6_nametodns(hostname, hostnamelen, 0); 1322 if (!n || n->m_next || n->m_len == 0) 1323 goto bad; 1324 IP6_EXTHDR_GET(subj, char *, m, 1325 off + sizeof(struct icmp6_nodeinfo), subjlen); 1326 if (subj == NULL) 1327 goto bad; 1328 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1329 n->m_len)) { 1330 goto bad; 1331 } 1332 m_freem(n); 1333 n = NULL; 1334 break; 1335 1336 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1337 default: 1338 goto bad; 1339 } 1340 break; 1341 } 1342 1343 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1344 switch (qtype) { 1345 case NI_QTYPE_FQDN: 1346 if ((icmp6_nodeinfo & 1) == 0) 1347 goto bad; 1348 break; 1349 case NI_QTYPE_NODEADDR: 1350 case NI_QTYPE_IPV4ADDR: 1351 if ((icmp6_nodeinfo & 2) == 0) 1352 goto bad; 1353 break; 1354 } 1355 1356 /* guess reply length */ 1357 switch (qtype) { 1358 case NI_QTYPE_NOOP: 1359 break; /* no reply data */ 1360 case NI_QTYPE_SUPTYPES: 1361 replylen += sizeof(u_int32_t); 1362 break; 1363 case NI_QTYPE_FQDN: 1364 /* XXX will append an mbuf */ 1365 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1366 break; 1367 case NI_QTYPE_NODEADDR: 1368 addrs = ni6_addrs(ni6, m, &ifp, subj, &psref); 1369 if ((replylen += addrs * (sizeof(struct in6_addr) + 1370 sizeof(u_int32_t))) > MCLBYTES) 1371 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1372 break; 1373 case NI_QTYPE_IPV4ADDR: 1374 /* unsupported - should respond with unknown Qtype? */ 1375 goto bad; 1376 default: 1377 /* 1378 * XXX: We must return a reply with the ICMP6 code 1379 * `unknown Qtype' in this case. However we regard the case 1380 * as an FQDN query for backward compatibility. 1381 * Older versions set a random value to this field, 1382 * so it rarely varies in the defined qtypes. 1383 * But the mechanism is not reliable... 1384 * maybe we should obsolete older versions. 1385 */ 1386 qtype = NI_QTYPE_FQDN; 1387 /* XXX will append an mbuf */ 1388 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1389 oldfqdn++; 1390 break; 1391 } 1392 1393 /* allocate an mbuf to reply. */ 1394 MGETHDR(n, M_DONTWAIT, m->m_type); 1395 if (n == NULL) { 1396 if_put(ifp, &psref); 1397 m_freem(m); 1398 return (NULL); 1399 } 1400 M_MOVE_PKTHDR(n, m); /* just for rcvif */ 1401 if (replylen > MHLEN) { 1402 if (replylen > MCLBYTES) { 1403 /* 1404 * XXX: should we try to allocate more? But MCLBYTES 1405 * is probably much larger than IPV6_MMTU... 1406 */ 1407 goto bad; 1408 } 1409 MCLGET(n, M_DONTWAIT); 1410 if ((n->m_flags & M_EXT) == 0) { 1411 goto bad; 1412 } 1413 } 1414 n->m_pkthdr.len = n->m_len = replylen; 1415 1416 /* copy mbuf header and IPv6 + Node Information base headers */ 1417 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1418 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1419 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1420 1421 /* qtype dependent procedure */ 1422 switch (qtype) { 1423 case NI_QTYPE_NOOP: 1424 nni6->ni_code = ICMP6_NI_SUCCESS; 1425 nni6->ni_flags = 0; 1426 break; 1427 case NI_QTYPE_SUPTYPES: 1428 { 1429 u_int32_t v; 1430 nni6->ni_code = ICMP6_NI_SUCCESS; 1431 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1432 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1433 v = (u_int32_t)htonl(0x0000000f); 1434 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1435 break; 1436 } 1437 case NI_QTYPE_FQDN: 1438 nni6->ni_code = ICMP6_NI_SUCCESS; 1439 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1440 sizeof(struct ip6_hdr) + 1441 sizeof(struct icmp6_nodeinfo)); 1442 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1443 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1444 /* 1445 * XXX do we really have FQDN in variable "hostname"? 1446 */ 1447 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1448 if (n->m_next == NULL) 1449 goto bad; 1450 /* XXX we assume that n->m_next is not a chain */ 1451 if (n->m_next->m_next != NULL) 1452 goto bad; 1453 n->m_pkthdr.len += n->m_next->m_len; 1454 break; 1455 case NI_QTYPE_NODEADDR: 1456 { 1457 int lenlim, copied; 1458 1459 nni6->ni_code = ICMP6_NI_SUCCESS; 1460 n->m_pkthdr.len = n->m_len = 1461 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1462 lenlim = M_TRAILINGSPACE(n); 1463 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1464 if_put(ifp, &psref); 1465 ifp = NULL; 1466 /* XXX: reset mbuf length */ 1467 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1468 sizeof(struct icmp6_nodeinfo) + copied; 1469 break; 1470 } 1471 default: 1472 break; /* XXX impossible! */ 1473 } 1474 1475 nni6->ni_type = ICMP6_NI_REPLY; 1476 m_freem(m); 1477 return (n); 1478 1479 bad: 1480 if_put(ifp, &psref); 1481 m_freem(m); 1482 if (n) 1483 m_freem(n); 1484 return (NULL); 1485 } 1486 #undef hostnamelen 1487 1488 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1489 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1490 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1491 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1492 1493 /* 1494 * make a mbuf with DNS-encoded string. no compression support. 1495 * 1496 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1497 * treated as truncated name (two \0 at the end). this is a wild guess. 1498 * 1499 * old - return pascal string if non-zero 1500 */ 1501 static struct mbuf * 1502 ni6_nametodns(const char *name, int namelen, int old) 1503 { 1504 struct mbuf *m; 1505 char *cp, *ep; 1506 const char *p, *q; 1507 int i, len, nterm; 1508 1509 if (old) 1510 len = namelen + 1; 1511 else 1512 len = MCLBYTES; 1513 1514 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1515 MGET(m, M_DONTWAIT, MT_DATA); 1516 if (m && len > MLEN) { 1517 MCLGET(m, M_DONTWAIT); 1518 if ((m->m_flags & M_EXT) == 0) 1519 goto fail; 1520 } 1521 if (!m) 1522 goto fail; 1523 m->m_next = NULL; 1524 1525 if (old) { 1526 m->m_len = len; 1527 *mtod(m, char *) = namelen; 1528 bcopy(name, mtod(m, char *) + 1, namelen); 1529 return m; 1530 } else { 1531 m->m_len = 0; 1532 cp = mtod(m, char *); 1533 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1534 1535 /* if not certain about my name, return empty buffer */ 1536 if (namelen == 0) 1537 return m; 1538 1539 /* 1540 * guess if it looks like shortened hostname, or FQDN. 1541 * shortened hostname needs two trailing "\0". 1542 */ 1543 i = 0; 1544 for (p = name; p < name + namelen; p++) { 1545 if (*p && *p == '.') 1546 i++; 1547 } 1548 if (i < 2) 1549 nterm = 2; 1550 else 1551 nterm = 1; 1552 1553 p = name; 1554 while (cp < ep && p < name + namelen) { 1555 i = 0; 1556 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1557 i++; 1558 /* result does not fit into mbuf */ 1559 if (cp + i + 1 >= ep) 1560 goto fail; 1561 /* 1562 * DNS label length restriction, RFC1035 page 8. 1563 * "i == 0" case is included here to avoid returning 1564 * 0-length label on "foo..bar". 1565 */ 1566 if (i <= 0 || i >= 64) 1567 goto fail; 1568 *cp++ = i; 1569 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1570 goto fail; 1571 while (i > 0) { 1572 if (!isalnum(*p) && *p != '-') 1573 goto fail; 1574 if (isupper(*p)) { 1575 *cp++ = tolower(*p); 1576 p++; 1577 } else 1578 *cp++ = *p++; 1579 i--; 1580 } 1581 p = q; 1582 if (p < name + namelen && *p == '.') 1583 p++; 1584 } 1585 /* termination */ 1586 if (cp + nterm >= ep) 1587 goto fail; 1588 while (nterm-- > 0) 1589 *cp++ = '\0'; 1590 m->m_len = cp - mtod(m, char *); 1591 return m; 1592 } 1593 1594 panic("should not reach here"); 1595 /* NOTREACHED */ 1596 1597 fail: 1598 if (m) 1599 m_freem(m); 1600 return NULL; 1601 } 1602 1603 /* 1604 * check if two DNS-encoded string matches. takes care of truncated 1605 * form (with \0\0 at the end). no compression support. 1606 * XXX upper/lowercase match (see RFC2065) 1607 */ 1608 static int 1609 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1610 { 1611 const char *a0, *b0; 1612 int l; 1613 1614 /* simplest case - need validation? */ 1615 if (alen == blen && memcmp(a, b, alen) == 0) 1616 return 1; 1617 1618 a0 = a; 1619 b0 = b; 1620 1621 /* termination is mandatory */ 1622 if (alen < 2 || blen < 2) 1623 return 0; 1624 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1625 return 0; 1626 alen--; 1627 blen--; 1628 1629 while (a - a0 < alen && b - b0 < blen) { 1630 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1631 return 0; 1632 1633 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1634 return 0; 1635 /* we don't support compression yet */ 1636 if (a[0] >= 64 || b[0] >= 64) 1637 return 0; 1638 1639 /* truncated case */ 1640 if (a[0] == 0 && a - a0 == alen - 1) 1641 return 1; 1642 if (b[0] == 0 && b - b0 == blen - 1) 1643 return 1; 1644 if (a[0] == 0 || b[0] == 0) 1645 return 0; 1646 1647 if (a[0] != b[0]) 1648 return 0; 1649 l = a[0]; 1650 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1651 return 0; 1652 if (memcmp(a + 1, b + 1, l) != 0) 1653 return 0; 1654 1655 a += 1 + l; 1656 b += 1 + l; 1657 } 1658 1659 if (a - a0 == alen && b - b0 == blen) 1660 return 1; 1661 else 1662 return 0; 1663 } 1664 1665 /* 1666 * calculate the number of addresses to be returned in the node info reply. 1667 */ 1668 static int 1669 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, 1670 struct ifnet **ifpp, char *subj, struct psref *psref) 1671 { 1672 struct ifnet *ifp; 1673 struct in6_ifaddr *ia6; 1674 struct ifaddr *ifa; 1675 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1676 int addrs = 0, addrsofif, iffound = 0; 1677 int niflags = ni6->ni_flags; 1678 int s; 1679 1680 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1681 switch (ni6->ni_code) { 1682 case ICMP6_NI_SUBJ_IPV6: 1683 if (subj == NULL) /* must be impossible... */ 1684 return (0); 1685 subj_ip6 = (struct sockaddr_in6 *)subj; 1686 break; 1687 default: 1688 /* 1689 * XXX: we only support IPv6 subject address for 1690 * this Qtype. 1691 */ 1692 return (0); 1693 } 1694 } 1695 1696 s = pserialize_read_enter(); 1697 IFNET_READER_FOREACH(ifp) { 1698 addrsofif = 0; 1699 IFADDR_READER_FOREACH(ifa, ifp) { 1700 if (ifa->ifa_addr->sa_family != AF_INET6) 1701 continue; 1702 ia6 = (struct in6_ifaddr *)ifa; 1703 1704 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1705 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1706 &ia6->ia_addr.sin6_addr)) 1707 iffound = 1; 1708 1709 /* 1710 * IPv4-mapped addresses can only be returned by a 1711 * Node Information proxy, since they represent 1712 * addresses of IPv4-only nodes, which perforce do 1713 * not implement this protocol. 1714 * [icmp-name-lookups-07, Section 5.4] 1715 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1716 * this function at this moment. 1717 */ 1718 1719 /* What do we have to do about ::1? */ 1720 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1721 case IPV6_ADDR_SCOPE_LINKLOCAL: 1722 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1723 continue; 1724 break; 1725 case IPV6_ADDR_SCOPE_SITELOCAL: 1726 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1727 continue; 1728 break; 1729 case IPV6_ADDR_SCOPE_GLOBAL: 1730 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1731 continue; 1732 break; 1733 default: 1734 continue; 1735 } 1736 1737 /* 1738 * check if anycast is okay. 1739 * XXX: just experimental. not in the spec. 1740 */ 1741 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1742 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1743 continue; /* we need only unicast addresses */ 1744 1745 addrsofif++; /* count the address */ 1746 } 1747 if (iffound) { 1748 if_acquire_NOMPSAFE(ifp, psref); 1749 pserialize_read_exit(s); 1750 *ifpp = ifp; 1751 return (addrsofif); 1752 } 1753 1754 addrs += addrsofif; 1755 } 1756 pserialize_read_exit(s); 1757 1758 return (addrs); 1759 } 1760 1761 static int 1762 ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1763 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1764 int resid) 1765 { 1766 struct ifnet *ifp; 1767 struct in6_ifaddr *ia6; 1768 struct ifaddr *ifa; 1769 struct ifnet *ifp_dep = NULL; 1770 int copied = 0, allow_deprecated = 0; 1771 u_char *cp = (u_char *)(nni6 + 1); 1772 int niflags = ni6->ni_flags; 1773 u_int32_t ltime; 1774 int s; 1775 1776 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1777 return (0); /* needless to copy */ 1778 1779 s = pserialize_read_enter(); 1780 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1781 again: 1782 1783 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1784 { 1785 IFADDR_READER_FOREACH(ifa, ifp) { 1786 if (ifa->ifa_addr->sa_family != AF_INET6) 1787 continue; 1788 ia6 = (struct in6_ifaddr *)ifa; 1789 1790 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1791 allow_deprecated == 0) { 1792 /* 1793 * prefererred address should be put before 1794 * deprecated addresses. 1795 */ 1796 1797 /* record the interface for later search */ 1798 if (ifp_dep == NULL) 1799 ifp_dep = ifp; 1800 1801 continue; 1802 } 1803 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1804 allow_deprecated != 0) 1805 continue; /* we now collect deprecated addrs */ 1806 1807 /* What do we have to do about ::1? */ 1808 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1809 case IPV6_ADDR_SCOPE_LINKLOCAL: 1810 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1811 continue; 1812 break; 1813 case IPV6_ADDR_SCOPE_SITELOCAL: 1814 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1815 continue; 1816 break; 1817 case IPV6_ADDR_SCOPE_GLOBAL: 1818 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1819 continue; 1820 break; 1821 default: 1822 continue; 1823 } 1824 1825 /* 1826 * check if anycast is okay. 1827 * XXX: just experimental. not in the spec. 1828 */ 1829 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1830 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1831 continue; 1832 1833 /* now we can copy the address */ 1834 if (resid < sizeof(struct in6_addr) + 1835 sizeof(u_int32_t)) { 1836 /* 1837 * We give up much more copy. 1838 * Set the truncate flag and return. 1839 */ 1840 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1841 goto out; 1842 } 1843 1844 /* 1845 * Set the TTL of the address. 1846 * The TTL value should be one of the following 1847 * according to the specification: 1848 * 1849 * 1. The remaining lifetime of a DHCP lease on the 1850 * address, or 1851 * 2. The remaining Valid Lifetime of a prefix from 1852 * which the address was derived through Stateless 1853 * Autoconfiguration. 1854 * 1855 * Note that we currently do not support stateful 1856 * address configuration by DHCPv6, so the former 1857 * case can't happen. 1858 * 1859 * TTL must be 2^31 > TTL >= 0. 1860 */ 1861 if (ia6->ia6_lifetime.ia6t_expire == 0) 1862 ltime = ND6_INFINITE_LIFETIME; 1863 else { 1864 if (ia6->ia6_lifetime.ia6t_expire > 1865 time_uptime) 1866 ltime = ia6->ia6_lifetime.ia6t_expire - 1867 time_uptime; 1868 else 1869 ltime = 0; 1870 } 1871 if (ltime > 0x7fffffff) 1872 ltime = 0x7fffffff; 1873 ltime = htonl(ltime); 1874 1875 bcopy(<ime, cp, sizeof(u_int32_t)); 1876 cp += sizeof(u_int32_t); 1877 1878 /* copy the address itself */ 1879 bcopy(&ia6->ia_addr.sin6_addr, cp, 1880 sizeof(struct in6_addr)); 1881 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1882 cp += sizeof(struct in6_addr); 1883 1884 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1885 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1886 } 1887 if (ifp0) /* we need search only on the specified IF */ 1888 break; 1889 } 1890 1891 if (allow_deprecated == 0 && ifp_dep != NULL) { 1892 ifp = ifp_dep; 1893 allow_deprecated = 1; 1894 1895 goto again; 1896 } 1897 out: 1898 pserialize_read_exit(s); 1899 return (copied); 1900 } 1901 1902 /* 1903 * XXX almost dup'ed code with rip6_input. 1904 */ 1905 static int 1906 icmp6_rip6_input(struct mbuf **mp, int off) 1907 { 1908 struct mbuf *m = *mp; 1909 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1910 struct inpcb_hdr *inph; 1911 struct in6pcb *in6p; 1912 struct in6pcb *last = NULL; 1913 struct sockaddr_in6 rip6src; 1914 struct icmp6_hdr *icmp6; 1915 struct mbuf *opts = NULL; 1916 1917 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1918 if (icmp6 == NULL) { 1919 /* m is already reclaimed */ 1920 return IPPROTO_DONE; 1921 } 1922 1923 /* 1924 * XXX: the address may have embedded scope zone ID, which should be 1925 * hidden from applications. 1926 */ 1927 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1928 if (sa6_recoverscope(&rip6src)) { 1929 m_freem(m); 1930 return (IPPROTO_DONE); 1931 } 1932 1933 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1934 in6p = (struct in6pcb *)inph; 1935 if (in6p->in6p_af != AF_INET6) 1936 continue; 1937 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1938 continue; 1939 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1940 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1941 continue; 1942 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1943 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1944 continue; 1945 if (in6p->in6p_icmp6filt 1946 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1947 in6p->in6p_icmp6filt)) 1948 continue; 1949 if (last) { 1950 struct mbuf *n; 1951 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1952 if (last->in6p_flags & IN6P_CONTROLOPTS) 1953 ip6_savecontrol(last, &opts, ip6, n); 1954 /* strip intermediate headers */ 1955 m_adj(n, off); 1956 if (sbappendaddr(&last->in6p_socket->so_rcv, 1957 sin6tosa(&rip6src), n, opts) == 0) { 1958 /* should notify about lost packet */ 1959 m_freem(n); 1960 if (opts) 1961 m_freem(opts); 1962 } else 1963 sorwakeup(last->in6p_socket); 1964 opts = NULL; 1965 } 1966 } 1967 last = in6p; 1968 } 1969 if (last) { 1970 if (last->in6p_flags & IN6P_CONTROLOPTS) 1971 ip6_savecontrol(last, &opts, ip6, m); 1972 /* strip intermediate headers */ 1973 m_adj(m, off); 1974 if (sbappendaddr(&last->in6p_socket->so_rcv, 1975 sin6tosa(&rip6src), m, opts) == 0) { 1976 m_freem(m); 1977 if (opts) 1978 m_freem(opts); 1979 } else 1980 sorwakeup(last->in6p_socket); 1981 } else { 1982 m_freem(m); 1983 IP6_STATDEC(IP6_STAT_DELIVERED); 1984 } 1985 return IPPROTO_DONE; 1986 } 1987 1988 /* 1989 * Reflect the ip6 packet back to the source. 1990 * OFF points to the icmp6 header, counted from the top of the mbuf. 1991 * 1992 * Note: RFC 1885 required that an echo reply should be truncated if it 1993 * did not fit in with (return) path MTU, and KAME code supported the 1994 * behavior. However, as a clarification after the RFC, this limitation 1995 * was removed in a revised version of the spec, RFC 2463. We had kept the 1996 * old behavior, with a (non-default) ifdef block, while the new version of 1997 * the spec was an internet-draft status, and even after the new RFC was 1998 * published. But it would rather make sense to clean the obsoleted part 1999 * up, and to make the code simpler at this stage. 2000 */ 2001 void 2002 icmp6_reflect(struct mbuf *m, size_t off) 2003 { 2004 struct ip6_hdr *ip6; 2005 struct icmp6_hdr *icmp6; 2006 const struct in6_ifaddr *ia; 2007 const struct ip6aux *ip6a; 2008 int plen; 2009 int type, code; 2010 struct ifnet *outif = NULL; 2011 struct in6_addr origdst; 2012 struct ifnet *rcvif; 2013 int s; 2014 bool ip6_src_filled = false; 2015 2016 /* too short to reflect */ 2017 if (off < sizeof(struct ip6_hdr)) { 2018 nd6log(LOG_DEBUG, 2019 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2020 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2021 __FILE__, __LINE__); 2022 goto bad; 2023 } 2024 2025 /* 2026 * If there are extra headers between IPv6 and ICMPv6, strip 2027 * off that header first. 2028 */ 2029 #ifdef DIAGNOSTIC 2030 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2031 panic("assumption failed in icmp6_reflect"); 2032 #endif 2033 if (off > sizeof(struct ip6_hdr)) { 2034 size_t l; 2035 struct ip6_hdr nip6; 2036 2037 l = off - sizeof(struct ip6_hdr); 2038 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2039 m_adj(m, l); 2040 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2041 if (m->m_len < l) { 2042 if ((m = m_pullup(m, l)) == NULL) 2043 return; 2044 } 2045 bcopy((void *)&nip6, mtod(m, void *), sizeof(nip6)); 2046 } else /* off == sizeof(struct ip6_hdr) */ { 2047 size_t l; 2048 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2049 if (m->m_len < l) { 2050 if ((m = m_pullup(m, l)) == NULL) 2051 return; 2052 } 2053 } 2054 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2055 ip6 = mtod(m, struct ip6_hdr *); 2056 ip6->ip6_nxt = IPPROTO_ICMPV6; 2057 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2058 type = icmp6->icmp6_type; /* keep type for statistics */ 2059 code = icmp6->icmp6_code; /* ditto. */ 2060 2061 origdst = ip6->ip6_dst; 2062 /* 2063 * ip6_input() drops a packet if its src is multicast. 2064 * So, the src is never multicast. 2065 */ 2066 ip6->ip6_dst = ip6->ip6_src; 2067 2068 /* 2069 * If the incoming packet was addressed directly to us (i.e. unicast), 2070 * use dst as the src for the reply. 2071 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2072 * (for example) when we encounter an error while forwarding procedure 2073 * destined to a duplicated address of ours. 2074 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2075 * procedure of an outgoing packet of our own, in which case we need 2076 * to search in the ifaddr list. 2077 */ 2078 if (IN6_IS_ADDR_MULTICAST(&origdst)) 2079 ; 2080 else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2081 if ((ip6a->ip6a_flags & 2082 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2083 ip6->ip6_src = ip6a->ip6a_src; 2084 ip6_src_filled = true; 2085 } 2086 } else { 2087 union { 2088 struct sockaddr_in6 sin6; 2089 struct sockaddr sa; 2090 } u; 2091 int _s; 2092 struct ifaddr *ifa; 2093 2094 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2095 2096 _s = pserialize_read_enter(); 2097 ifa = ifa_ifwithaddr(&u.sa); 2098 2099 if (ifa != NULL) { 2100 ia = ifatoia6(ifa); 2101 if ((ia->ia6_flags & 2102 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2103 ip6->ip6_src = ia->ia_addr.sin6_addr; 2104 ip6_src_filled = true; 2105 } 2106 } 2107 pserialize_read_exit(_s); 2108 } 2109 2110 if (!ip6_src_filled) { 2111 int e; 2112 struct sockaddr_in6 sin6; 2113 struct route ro; 2114 2115 /* 2116 * This case matches to multicasts, our anycast, or unicasts 2117 * that we do not own. Select a source address based on the 2118 * source address of the erroneous packet. 2119 */ 2120 /* zone ID should be embedded */ 2121 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2122 2123 memset(&ro, 0, sizeof(ro)); 2124 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2125 &ip6->ip6_src); 2126 rtcache_free(&ro); 2127 if (e != 0) { 2128 nd6log(LOG_DEBUG, 2129 "source can't be determined: " 2130 "dst=%s, error=%d\n", 2131 ip6_sprintf(&sin6.sin6_addr), e); 2132 goto bad; 2133 } 2134 } 2135 2136 ip6->ip6_flow = 0; 2137 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2138 ip6->ip6_vfc |= IPV6_VERSION; 2139 ip6->ip6_nxt = IPPROTO_ICMPV6; 2140 rcvif = m_get_rcvif(m, &s); 2141 if (rcvif) { 2142 /* XXX: This may not be the outgoing interface */ 2143 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2144 } else 2145 ip6->ip6_hlim = ip6_defhlim; 2146 m_put_rcvif(rcvif, &s); 2147 2148 m->m_pkthdr.csum_flags = 0; 2149 icmp6->icmp6_cksum = 0; 2150 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2151 sizeof(struct ip6_hdr), plen); 2152 2153 /* 2154 * XXX option handling 2155 */ 2156 2157 m->m_flags &= ~(M_BCAST|M_MCAST); 2158 2159 /* 2160 * To avoid a "too big" situation at an intermediate router 2161 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2162 * Note that only echo and node information replies are affected, 2163 * since the length of ICMP6 errors is limited to the minimum MTU. 2164 */ 2165 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) 2166 != 0 && outif) 2167 icmp6_ifstat_inc(outif, ifs6_out_error); 2168 if (outif) 2169 icmp6_ifoutstat_inc(outif, type, code); 2170 2171 return; 2172 2173 bad: 2174 m_freem(m); 2175 return; 2176 } 2177 2178 static const char * 2179 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 2180 struct in6_addr *tgt6) 2181 { 2182 static char buf[1024]; 2183 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2184 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2185 return buf; 2186 } 2187 2188 void 2189 icmp6_redirect_input(struct mbuf *m, int off) 2190 { 2191 struct ifnet *ifp; 2192 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2193 struct nd_redirect *nd_rd; 2194 int icmp6len = ntohs(ip6->ip6_plen); 2195 char *lladdr = NULL; 2196 int lladdrlen = 0; 2197 struct rtentry *rt = NULL; 2198 int is_router; 2199 int is_onlink; 2200 struct in6_addr src6 = ip6->ip6_src; 2201 struct in6_addr redtgt6; 2202 struct in6_addr reddst6; 2203 union nd_opts ndopts; 2204 struct psref psref; 2205 2206 ifp = m_get_rcvif_psref(m, &psref); 2207 if (ifp == NULL) 2208 goto freeit; 2209 2210 /* XXX if we are router, we don't update route by icmp6 redirect */ 2211 if (ip6_forwarding) 2212 goto freeit; 2213 if (!icmp6_rediraccept) 2214 goto freeit; 2215 2216 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2217 if (nd_rd == NULL) { 2218 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2219 m_put_rcvif_psref(ifp, &psref); 2220 return; 2221 } 2222 redtgt6 = nd_rd->nd_rd_target; 2223 reddst6 = nd_rd->nd_rd_dst; 2224 2225 if (in6_setscope(&redtgt6, ifp, NULL) || 2226 in6_setscope(&reddst6, ifp, NULL)) { 2227 goto freeit; 2228 } 2229 2230 /* validation */ 2231 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2232 nd6log(LOG_ERR, 2233 "ICMP6 redirect sent from %s rejected; " 2234 "must be from linklocal\n", ip6_sprintf(&src6)); 2235 goto bad; 2236 } 2237 if (ip6->ip6_hlim != 255) { 2238 nd6log(LOG_ERR, 2239 "ICMP6 redirect sent from %s rejected; " 2240 "hlim=%d (must be 255)\n", 2241 ip6_sprintf(&src6), ip6->ip6_hlim); 2242 goto bad; 2243 } 2244 { 2245 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2246 struct sockaddr_in6 sin6; 2247 struct in6_addr *gw6; 2248 2249 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2250 rt = rtalloc1(sin6tosa(&sin6), 0); 2251 if (rt) { 2252 if (rt->rt_gateway == NULL || 2253 rt->rt_gateway->sa_family != AF_INET6) { 2254 nd6log(LOG_ERR, 2255 "ICMP6 redirect rejected; no route " 2256 "with inet6 gateway found for redirect dst: %s\n", 2257 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2258 rtfree(rt); 2259 goto bad; 2260 } 2261 2262 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2263 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2264 nd6log(LOG_ERR, 2265 "ICMP6 redirect rejected; " 2266 "not equal to gw-for-src=%s (must be same): %s\n", 2267 ip6_sprintf(gw6), 2268 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2269 rtfree(rt); 2270 goto bad; 2271 } 2272 } else { 2273 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2274 "no route found for redirect dst: %s\n", 2275 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2276 goto bad; 2277 } 2278 rtfree(rt); 2279 rt = NULL; 2280 } 2281 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2282 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2283 "redirect dst must be unicast: %s\n", 2284 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2285 goto bad; 2286 } 2287 2288 is_router = is_onlink = 0; 2289 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2290 is_router = 1; /* router case */ 2291 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2292 is_onlink = 1; /* on-link destination case */ 2293 if (!is_router && !is_onlink) { 2294 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2295 "neither router case nor onlink case: %s\n", 2296 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2297 goto bad; 2298 } 2299 /* validation passed */ 2300 2301 icmp6len -= sizeof(*nd_rd); 2302 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2303 if (nd6_options(&ndopts) < 0) { 2304 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2305 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2306 /* nd6_options have incremented stats */ 2307 goto freeit; 2308 } 2309 2310 if (ndopts.nd_opts_tgt_lladdr) { 2311 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2312 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2313 } 2314 2315 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2316 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2317 "(if %d, icmp6 packet %d): %s\n", 2318 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2319 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2320 goto bad; 2321 } 2322 2323 /* RFC 2461 8.3 */ 2324 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2325 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2326 2327 m_put_rcvif_psref(ifp, &psref); 2328 ifp = NULL; 2329 2330 if (!is_onlink) { /* better router case. perform rtredirect. */ 2331 /* perform rtredirect */ 2332 struct sockaddr_in6 sdst; 2333 struct sockaddr_in6 sgw; 2334 struct sockaddr_in6 ssrc; 2335 unsigned long rtcount; 2336 struct rtentry *newrt = NULL; 2337 2338 /* 2339 * do not install redirect route, if the number of entries 2340 * is too much (> hiwat). note that, the node (= host) will 2341 * work just fine even if we do not install redirect route 2342 * (there will be additional hops, though). 2343 */ 2344 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2345 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) 2346 goto freeit; 2347 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) 2348 goto freeit; 2349 else if (0 <= icmp6_redirect_lowat && 2350 rtcount > icmp6_redirect_lowat) { 2351 /* 2352 * XXX nuke a victim, install the new one. 2353 */ 2354 } 2355 2356 memset(&sdst, 0, sizeof(sdst)); 2357 memset(&sgw, 0, sizeof(sgw)); 2358 memset(&ssrc, 0, sizeof(ssrc)); 2359 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2360 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2361 sizeof(struct sockaddr_in6); 2362 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2363 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2364 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2365 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2366 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), 2367 &newrt); 2368 2369 if (newrt) { 2370 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2371 icmp6_redirect_timeout_q); 2372 rtfree(newrt); 2373 } 2374 } 2375 /* finally update cached route in each socket via pfctlinput */ 2376 { 2377 struct sockaddr_in6 sdst; 2378 2379 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2380 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2381 #if defined(IPSEC) 2382 if (ipsec_used) 2383 key_sa_routechange(sin6tosa(&sdst)); 2384 #endif 2385 } 2386 2387 freeit: 2388 if (ifp != NULL) 2389 m_put_rcvif_psref(ifp, &psref); 2390 m_freem(m); 2391 return; 2392 2393 bad: 2394 m_put_rcvif_psref(ifp, &psref); 2395 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2396 m_freem(m); 2397 } 2398 2399 void 2400 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2401 { 2402 struct ifnet *ifp; /* my outgoing interface */ 2403 struct in6_addr *ifp_ll6; 2404 struct in6_addr *nexthop; 2405 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2406 struct mbuf *m = NULL; /* newly allocated one */ 2407 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2408 struct nd_redirect *nd_rd; 2409 size_t maxlen; 2410 u_char *p; 2411 struct sockaddr_in6 src_sa; 2412 2413 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2414 2415 /* if we are not router, we don't send icmp6 redirect */ 2416 if (!ip6_forwarding) 2417 goto fail; 2418 2419 /* sanity check */ 2420 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2421 goto fail; 2422 2423 /* 2424 * Address check: 2425 * the source address must identify a neighbor, and 2426 * the destination address must not be a multicast address 2427 * [RFC 2461, sec 8.2] 2428 */ 2429 sip6 = mtod(m0, struct ip6_hdr *); 2430 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2431 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2432 goto fail; 2433 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2434 goto fail; /* what should we do here? */ 2435 2436 /* rate limit */ 2437 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2438 goto fail; 2439 2440 /* 2441 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2442 * we almost always ask for an mbuf cluster for simplicity. 2443 * (MHLEN < IPV6_MMTU is almost always true) 2444 */ 2445 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2446 if (m && IPV6_MMTU >= MHLEN) { 2447 #if IPV6_MMTU >= MCLBYTES 2448 _MCLGET(m, mcl_cache, IPV6_MMTU, M_DONTWAIT); 2449 #else 2450 MCLGET(m, M_DONTWAIT); 2451 #endif 2452 } 2453 2454 if (!m) 2455 goto fail; 2456 m_reset_rcvif(m); 2457 m->m_len = 0; 2458 maxlen = M_TRAILINGSPACE(m); 2459 maxlen = min(IPV6_MMTU, maxlen); 2460 /* just for safety */ 2461 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2462 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2463 goto fail; 2464 } 2465 2466 { 2467 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2468 struct in6_ifaddr *ia; 2469 int s = pserialize_read_enter(); 2470 if ((ia = in6ifa_ifpforlinklocal(ifp, 2471 IN6_IFF_NOTREADY| 2472 IN6_IFF_ANYCAST)) == NULL) { 2473 pserialize_read_exit(s); 2474 goto fail; 2475 } 2476 ifp_ll6 = &ia->ia_addr.sin6_addr; 2477 pserialize_read_exit(s); 2478 } 2479 2480 /* get ip6 linklocal address for the router. */ 2481 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2482 struct sockaddr_in6 *sin6; 2483 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2484 nexthop = &sin6->sin6_addr; 2485 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2486 nexthop = NULL; 2487 } else 2488 nexthop = NULL; 2489 2490 /* ip6 */ 2491 ip6 = mtod(m, struct ip6_hdr *); 2492 ip6->ip6_flow = 0; 2493 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2494 ip6->ip6_vfc |= IPV6_VERSION; 2495 /* ip6->ip6_plen will be set later */ 2496 ip6->ip6_nxt = IPPROTO_ICMPV6; 2497 ip6->ip6_hlim = 255; 2498 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2499 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2500 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2501 2502 /* ND Redirect */ 2503 nd_rd = (struct nd_redirect *)(ip6 + 1); 2504 nd_rd->nd_rd_type = ND_REDIRECT; 2505 nd_rd->nd_rd_code = 0; 2506 nd_rd->nd_rd_reserved = 0; 2507 if (rt->rt_flags & RTF_GATEWAY) { 2508 /* 2509 * nd_rd->nd_rd_target must be a link-local address in 2510 * better router cases. 2511 */ 2512 if (!nexthop) 2513 goto fail; 2514 bcopy(nexthop, &nd_rd->nd_rd_target, 2515 sizeof(nd_rd->nd_rd_target)); 2516 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2517 sizeof(nd_rd->nd_rd_dst)); 2518 } else { 2519 /* make sure redtgt == reddst */ 2520 nexthop = &sip6->ip6_dst; 2521 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2522 sizeof(nd_rd->nd_rd_target)); 2523 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2524 sizeof(nd_rd->nd_rd_dst)); 2525 } 2526 2527 p = (u_char *)(nd_rd + 1); 2528 2529 { 2530 /* target lladdr option */ 2531 struct llentry *ln = NULL; 2532 int len; 2533 struct nd_opt_hdr *nd_opt; 2534 char *lladdr; 2535 2536 ln = nd6_lookup(nexthop, ifp, false); 2537 if (ln == NULL) 2538 goto nolladdropt; 2539 len = sizeof(*nd_opt) + ifp->if_addrlen; 2540 len = (len + 7) & ~7; /* round by 8 */ 2541 /* safety check */ 2542 if (len + (p - (u_char *)ip6) > maxlen) { 2543 LLE_RUNLOCK(ln); 2544 goto nolladdropt; 2545 } 2546 if (ln->la_flags & LLE_VALID) { 2547 nd_opt = (struct nd_opt_hdr *)p; 2548 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2549 nd_opt->nd_opt_len = len >> 3; 2550 lladdr = (char *)(nd_opt + 1); 2551 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2552 p += len; 2553 } 2554 LLE_RUNLOCK(ln); 2555 } 2556 nolladdropt:; 2557 2558 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2559 2560 /* just to be safe */ 2561 if (m0->m_flags & M_DECRYPTED) 2562 goto noredhdropt; 2563 if (p - (u_char *)ip6 > maxlen) 2564 goto noredhdropt; 2565 2566 { 2567 /* redirected header option */ 2568 int len; 2569 struct nd_opt_rd_hdr *nd_opt_rh; 2570 2571 /* 2572 * compute the maximum size for icmp6 redirect header option. 2573 * XXX room for auth header? 2574 */ 2575 len = maxlen - (p - (u_char *)ip6); 2576 len &= ~7; 2577 2578 /* 2579 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2580 * about padding/truncate rule for the original IP packet. 2581 * From the discussion on IPv6imp in Feb 1999, 2582 * the consensus was: 2583 * - "attach as much as possible" is the goal 2584 * - pad if not aligned (original size can be guessed by 2585 * original ip6 header) 2586 * Following code adds the padding if it is simple enough, 2587 * and truncates if not. 2588 */ 2589 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2590 /* not enough room, truncate */ 2591 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2592 m0->m_pkthdr.len); 2593 } else { 2594 /* 2595 * enough room, truncate if not aligned. 2596 * we don't pad here for simplicity. 2597 */ 2598 size_t extra; 2599 2600 extra = m0->m_pkthdr.len % 8; 2601 if (extra) { 2602 /* truncate */ 2603 m_adj(m0, -extra); 2604 } 2605 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2606 } 2607 2608 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2609 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2610 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2611 nd_opt_rh->nd_opt_rh_len = len >> 3; 2612 p += sizeof(*nd_opt_rh); 2613 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2614 2615 /* connect m0 to m */ 2616 m->m_pkthdr.len += m0->m_pkthdr.len; 2617 m_cat(m, m0); 2618 m0 = NULL; 2619 } 2620 noredhdropt: 2621 if (m0) { 2622 m_freem(m0); 2623 m0 = NULL; 2624 } 2625 2626 /* XXX: clear embedded link IDs in the inner header */ 2627 in6_clearscope(&sip6->ip6_src); 2628 in6_clearscope(&sip6->ip6_dst); 2629 in6_clearscope(&nd_rd->nd_rd_target); 2630 in6_clearscope(&nd_rd->nd_rd_dst); 2631 2632 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2633 2634 nd_rd->nd_rd_cksum = 0; 2635 nd_rd->nd_rd_cksum 2636 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2637 2638 /* send the packet to outside... */ 2639 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2640 icmp6_ifstat_inc(ifp, ifs6_out_error); 2641 2642 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2643 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2644 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2645 2646 return; 2647 2648 fail: 2649 if (m) 2650 m_freem(m); 2651 if (m0) 2652 m_freem(m0); 2653 } 2654 2655 /* 2656 * ICMPv6 socket option processing. 2657 */ 2658 int 2659 icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2660 { 2661 int error = 0; 2662 struct in6pcb *in6p = sotoin6pcb(so); 2663 2664 if (sopt->sopt_level != IPPROTO_ICMPV6) 2665 return rip6_ctloutput(op, so, sopt); 2666 2667 switch (op) { 2668 case PRCO_SETOPT: 2669 switch (sopt->sopt_name) { 2670 case ICMP6_FILTER: 2671 { 2672 struct icmp6_filter fil; 2673 2674 error = sockopt_get(sopt, &fil, sizeof(fil)); 2675 if (error) 2676 break; 2677 memcpy(in6p->in6p_icmp6filt, &fil, 2678 sizeof(struct icmp6_filter)); 2679 error = 0; 2680 break; 2681 } 2682 2683 default: 2684 error = ENOPROTOOPT; 2685 break; 2686 } 2687 break; 2688 2689 case PRCO_GETOPT: 2690 switch (sopt->sopt_name) { 2691 case ICMP6_FILTER: 2692 { 2693 if (in6p->in6p_icmp6filt == NULL) { 2694 error = EINVAL; 2695 break; 2696 } 2697 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2698 sizeof(struct icmp6_filter)); 2699 break; 2700 } 2701 2702 default: 2703 error = ENOPROTOOPT; 2704 break; 2705 } 2706 break; 2707 } 2708 2709 return (error); 2710 } 2711 2712 /* 2713 * Perform rate limit check. 2714 * Returns 0 if it is okay to send the icmp6 packet. 2715 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2716 * limitation. 2717 * 2718 * XXX per-destination/type check necessary? 2719 */ 2720 static int 2721 icmp6_ratelimit( 2722 const struct in6_addr *dst, /* not used at this moment */ 2723 const int type, /* not used at this moment */ 2724 const int code) /* not used at this moment */ 2725 { 2726 int ret; 2727 2728 ret = 0; /* okay to send */ 2729 2730 /* PPS limit */ 2731 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2732 icmp6errppslim)) { 2733 /* The packet is subject to rate limit */ 2734 ret++; 2735 } 2736 2737 return ret; 2738 } 2739 2740 static struct rtentry * 2741 icmp6_mtudisc_clone(struct sockaddr *dst) 2742 { 2743 struct rtentry *rt; 2744 int error; 2745 2746 rt = rtalloc1(dst, 1); 2747 if (rt == 0) 2748 return NULL; 2749 2750 /* If we didn't get a host route, allocate one */ 2751 if ((rt->rt_flags & RTF_HOST) == 0) { 2752 struct rtentry *nrt; 2753 2754 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2755 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2756 if (error) { 2757 rtfree(rt); 2758 return NULL; 2759 } 2760 nrt->rt_rmx = rt->rt_rmx; 2761 rtfree(rt); 2762 rt = nrt; 2763 } 2764 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2765 icmp6_mtudisc_timeout_q); 2766 if (error) { 2767 rtfree(rt); 2768 return NULL; 2769 } 2770 2771 return rt; /* caller need to call rtfree() */ 2772 } 2773 2774 static void 2775 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2776 { 2777 2778 KASSERT(rt != NULL); 2779 rt_assert_referenced(rt); 2780 2781 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2782 (RTF_DYNAMIC | RTF_HOST)) { 2783 rtrequest(RTM_DELETE, rt_getkey(rt), 2784 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2785 } else { 2786 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2787 rt->rt_rmx.rmx_mtu = 0; 2788 } 2789 } 2790 2791 static void 2792 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2793 { 2794 2795 KASSERT(rt != NULL); 2796 rt_assert_referenced(rt); 2797 2798 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2799 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2800 rtrequest(RTM_DELETE, rt_getkey(rt), 2801 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2802 } 2803 } 2804 2805 /* 2806 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2807 */ 2808 static int 2809 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2810 { 2811 (void)&name; 2812 (void)&l; 2813 (void)&oname; 2814 2815 if (namelen != 0) 2816 return (EINVAL); 2817 2818 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2819 /*XXXUNCONST*/ 2820 __UNCONST(newp), newlen)); 2821 } 2822 2823 static int 2824 sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2825 { 2826 2827 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2828 } 2829 2830 static int 2831 sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2832 { 2833 int error, tmp; 2834 struct sysctlnode node; 2835 2836 node = *rnode; 2837 node.sysctl_data = &tmp; 2838 tmp = icmp6_redirtimeout; 2839 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2840 if (error || newp == NULL) 2841 return error; 2842 if (tmp < 0) 2843 return EINVAL; 2844 icmp6_redirtimeout = tmp; 2845 2846 if (icmp6_redirect_timeout_q != NULL) { 2847 if (icmp6_redirtimeout == 0) { 2848 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2849 } else { 2850 rt_timer_queue_change(icmp6_redirect_timeout_q, 2851 icmp6_redirtimeout); 2852 } 2853 } else if (icmp6_redirtimeout > 0) { 2854 icmp6_redirect_timeout_q = 2855 rt_timer_queue_create(icmp6_redirtimeout); 2856 } 2857 2858 return 0; 2859 } 2860 2861 static void 2862 sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2863 { 2864 extern int nd6_maxqueuelen; /* defined in nd6.c */ 2865 2866 sysctl_createv(clog, 0, NULL, NULL, 2867 CTLFLAG_PERMANENT, 2868 CTLTYPE_NODE, "inet6", NULL, 2869 NULL, 0, NULL, 0, 2870 CTL_NET, PF_INET6, CTL_EOL); 2871 sysctl_createv(clog, 0, NULL, NULL, 2872 CTLFLAG_PERMANENT, 2873 CTLTYPE_NODE, "icmp6", 2874 SYSCTL_DESCR("ICMPv6 related settings"), 2875 NULL, 0, NULL, 0, 2876 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2877 2878 sysctl_createv(clog, 0, NULL, NULL, 2879 CTLFLAG_PERMANENT, 2880 CTLTYPE_STRUCT, "stats", 2881 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2882 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2883 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2884 ICMPV6CTL_STATS, CTL_EOL); 2885 sysctl_createv(clog, 0, NULL, NULL, 2886 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2887 CTLTYPE_INT, "rediraccept", 2888 SYSCTL_DESCR("Accept and process redirect messages"), 2889 NULL, 0, &icmp6_rediraccept, 0, 2890 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2891 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2892 sysctl_createv(clog, 0, NULL, NULL, 2893 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2894 CTLTYPE_INT, "redirtimeout", 2895 SYSCTL_DESCR("Redirect generated route lifetime"), 2896 sysctl_net_inet6_icmp6_redirtimeout, 0, 2897 &icmp6_redirtimeout, 0, 2898 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2899 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2900 #if 0 /* obsoleted */ 2901 sysctl_createv(clog, 0, NULL, NULL, 2902 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2903 CTLTYPE_INT, "errratelimit", NULL, 2904 NULL, 0, &icmp6_errratelimit, 0, 2905 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2906 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2907 #endif 2908 sysctl_createv(clog, 0, NULL, NULL, 2909 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2910 CTLTYPE_INT, "nd6_prune", 2911 SYSCTL_DESCR("Neighbor discovery prune interval"), 2912 NULL, 0, &nd6_prune, 0, 2913 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2914 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2915 sysctl_createv(clog, 0, NULL, NULL, 2916 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2917 CTLTYPE_INT, "nd6_delay", 2918 SYSCTL_DESCR("First probe delay time"), 2919 NULL, 0, &nd6_delay, 0, 2920 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2921 ICMPV6CTL_ND6_DELAY, CTL_EOL); 2922 sysctl_createv(clog, 0, NULL, NULL, 2923 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2924 CTLTYPE_INT, "nd6_umaxtries", 2925 SYSCTL_DESCR("Number of unicast discovery attempts"), 2926 NULL, 0, &nd6_umaxtries, 0, 2927 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2928 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 2929 sysctl_createv(clog, 0, NULL, NULL, 2930 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2931 CTLTYPE_INT, "nd6_mmaxtries", 2932 SYSCTL_DESCR("Number of multicast discovery attempts"), 2933 NULL, 0, &nd6_mmaxtries, 0, 2934 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2935 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 2936 sysctl_createv(clog, 0, NULL, NULL, 2937 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2938 CTLTYPE_INT, "nd6_useloopback", 2939 SYSCTL_DESCR("Use loopback interface for local traffic"), 2940 NULL, 0, &nd6_useloopback, 0, 2941 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2942 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 2943 #if 0 /* obsoleted */ 2944 sysctl_createv(clog, 0, NULL, NULL, 2945 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2946 CTLTYPE_INT, "nd6_proxyall", NULL, 2947 NULL, 0, &nd6_proxyall, 0, 2948 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2949 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 2950 #endif 2951 sysctl_createv(clog, 0, NULL, NULL, 2952 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2953 CTLTYPE_INT, "nodeinfo", 2954 SYSCTL_DESCR("Respond to node information requests"), 2955 NULL, 0, &icmp6_nodeinfo, 0, 2956 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2957 ICMPV6CTL_NODEINFO, CTL_EOL); 2958 sysctl_createv(clog, 0, NULL, NULL, 2959 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2960 CTLTYPE_INT, "errppslimit", 2961 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 2962 NULL, 0, &icmp6errppslim, 0, 2963 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2964 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 2965 sysctl_createv(clog, 0, NULL, NULL, 2966 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2967 CTLTYPE_INT, "nd6_maxnudhint", 2968 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 2969 NULL, 0, &nd6_maxnudhint, 0, 2970 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2971 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 2972 sysctl_createv(clog, 0, NULL, NULL, 2973 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2974 CTLTYPE_INT, "mtudisc_hiwat", 2975 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2976 NULL, 0, &icmp6_mtudisc_hiwat, 0, 2977 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2978 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 2979 sysctl_createv(clog, 0, NULL, NULL, 2980 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2981 CTLTYPE_INT, "mtudisc_lowat", 2982 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2983 NULL, 0, &icmp6_mtudisc_lowat, 0, 2984 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2985 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 2986 sysctl_createv(clog, 0, NULL, NULL, 2987 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2988 CTLTYPE_INT, "nd6_debug", 2989 SYSCTL_DESCR("Enable neighbor discovery debug output"), 2990 NULL, 0, &nd6_debug, 0, 2991 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2992 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 2993 sysctl_createv(clog, 0, NULL, NULL, 2994 CTLFLAG_PERMANENT, 2995 CTLTYPE_STRUCT, "nd6_drlist", 2996 SYSCTL_DESCR("Default router list"), 2997 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 2998 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2999 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 3000 sysctl_createv(clog, 0, NULL, NULL, 3001 CTLFLAG_PERMANENT, 3002 CTLTYPE_STRUCT, "nd6_prlist", 3003 SYSCTL_DESCR("Prefix list"), 3004 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3005 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3006 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 3007 sysctl_createv(clog, 0, NULL, NULL, 3008 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3009 CTLTYPE_INT, "maxqueuelen", 3010 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3011 NULL, 1, &nd6_maxqueuelen, 0, 3012 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3013 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3014 } 3015 3016 void 3017 icmp6_statinc(u_int stat) 3018 { 3019 3020 KASSERT(stat < ICMP6_NSTATS); 3021 ICMP6_STATINC(stat); 3022 } 3023
Indexes created Tue Oct 21 19:09:51 GMT 2025