1 /* $NetBSD: icmp6.c,v 1.199 2016/10/25 02:45:10 ozaki-r 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 1.199 2016/10/25 02:45:10 ozaki-r 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; 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 ip6 = mtod(m, struct ip6_hdr *); 479 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 480 if (icmp6 == NULL) { 481 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 482 icmp6_ifstat_inc(rcvif, ifs6_in_error); 483 goto freeit; 484 } 485 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 486 487 /* 488 * calculate the checksum 489 */ 490 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 491 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 492 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)); 493 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 494 icmp6_ifstat_inc(rcvif, ifs6_in_error); 495 goto freeit; 496 } 497 498 #if defined(NFAITH) && 0 < NFAITH 499 if (faithprefix(&ip6->ip6_dst)) { 500 /* 501 * Deliver very specific ICMP6 type only. 502 * This is important to deliver TOOBIG. Otherwise PMTUD 503 * will not work. 504 */ 505 switch (icmp6->icmp6_type) { 506 case ICMP6_DST_UNREACH: 507 case ICMP6_PACKET_TOO_BIG: 508 case ICMP6_TIME_EXCEEDED: 509 break; 510 default: 511 goto freeit; 512 } 513 } 514 #endif 515 516 code = icmp6->icmp6_code; 517 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 518 519 switch (icmp6->icmp6_type) { 520 case ICMP6_DST_UNREACH: 521 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 522 switch (code) { 523 case ICMP6_DST_UNREACH_NOROUTE: 524 code = PRC_UNREACH_NET; 525 break; 526 case ICMP6_DST_UNREACH_ADMIN: 527 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 528 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 529 break; 530 case ICMP6_DST_UNREACH_ADDR: 531 code = PRC_HOSTDEAD; 532 break; 533 #ifdef COMPAT_RFC1885 534 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 535 code = PRC_UNREACH_SRCFAIL; 536 break; 537 #else 538 case ICMP6_DST_UNREACH_BEYONDSCOPE: 539 /* I mean "source address was incorrect." */ 540 code = PRC_UNREACH_NET; 541 break; 542 #endif 543 case ICMP6_DST_UNREACH_NOPORT: 544 code = PRC_UNREACH_PORT; 545 break; 546 default: 547 goto badcode; 548 } 549 goto deliver; 550 551 case ICMP6_PACKET_TOO_BIG: 552 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 553 554 /* 555 * MTU is checked in icmp6_mtudisc. 556 */ 557 code = PRC_MSGSIZE; 558 559 /* 560 * Updating the path MTU will be done after examining 561 * intermediate extension headers. 562 */ 563 goto deliver; 564 565 case ICMP6_TIME_EXCEEDED: 566 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 567 switch (code) { 568 case ICMP6_TIME_EXCEED_TRANSIT: 569 code = PRC_TIMXCEED_INTRANS; 570 break; 571 case ICMP6_TIME_EXCEED_REASSEMBLY: 572 code = PRC_TIMXCEED_REASS; 573 break; 574 default: 575 goto badcode; 576 } 577 goto deliver; 578 579 case ICMP6_PARAM_PROB: 580 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 581 switch (code) { 582 case ICMP6_PARAMPROB_NEXTHEADER: 583 code = PRC_UNREACH_PROTOCOL; 584 break; 585 case ICMP6_PARAMPROB_HEADER: 586 case ICMP6_PARAMPROB_OPTION: 587 code = PRC_PARAMPROB; 588 break; 589 default: 590 goto badcode; 591 } 592 goto deliver; 593 594 case ICMP6_ECHO_REQUEST: 595 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 596 if (code != 0) 597 goto badcode; 598 /* 599 * Copy mbuf to send to two data paths: userland socket(s), 600 * and to the querier (echo reply). 601 * m: a copy for socket, n: a copy for querier 602 * 603 * If the first mbuf is shared, or the first mbuf is too short, 604 * copy the first part of the data into a fresh mbuf. 605 * Otherwise, we will wrongly overwrite both copies. 606 */ 607 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 608 /* Give up local */ 609 n = m; 610 m = NULL; 611 } else if (M_READONLY(n) || 612 n->m_len < off + sizeof(struct icmp6_hdr)) { 613 struct mbuf *n0 = n; 614 615 /* 616 * Prepare an internal mbuf. m_pullup() doesn't 617 * always copy the length we specified. 618 */ 619 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 620 /* Give up local */ 621 n = m; 622 m = NULL; 623 } 624 m_freem(n0); 625 } 626 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 627 sizeof(*nicmp6)); 628 if (nicmp6 == NULL) 629 goto freeit; 630 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 631 nicmp6->icmp6_code = 0; 632 if (n) { 633 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 634 icmp6s[ICMP6_STAT_REFLECT]++; 635 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 636 ICMP6_STAT_PUTREF(); 637 icmp6_reflect(n, off); 638 } 639 if (!m) 640 goto freeit; 641 break; 642 643 case ICMP6_ECHO_REPLY: 644 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 645 if (code != 0) 646 goto badcode; 647 break; 648 649 case MLD_LISTENER_QUERY: 650 case MLD_LISTENER_REPORT: 651 if (icmp6len < sizeof(struct mld_hdr)) 652 goto badlen; 653 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 654 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 655 else 656 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 657 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 658 /* give up local */ 659 mld_input(m, off); 660 m = NULL; 661 goto freeit; 662 } 663 mld_input(n, off); 664 /* m stays. */ 665 break; 666 667 case MLD_LISTENER_DONE: 668 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 669 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 670 goto badlen; 671 break; /* nothing to be done in kernel */ 672 673 case MLD_MTRACE_RESP: 674 case MLD_MTRACE: 675 /* XXX: these two are experimental. not officially defined. */ 676 /* XXX: per-interface statistics? */ 677 break; /* just pass it to applications */ 678 679 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 680 { 681 enum { WRU, FQDN } mode; 682 683 if (!icmp6_nodeinfo) 684 break; 685 686 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 687 mode = WRU; 688 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 689 mode = FQDN; 690 else 691 goto badlen; 692 693 if (mode == FQDN) { 694 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 695 if (n) 696 n = ni6_input(n, off); 697 /* XXX meaningless if n == NULL */ 698 noff = sizeof(struct ip6_hdr); 699 } else { 700 u_char *p; 701 int maxhlen; 702 703 if ((icmp6_nodeinfo & 5) != 5) 704 break; 705 706 if (code != 0) 707 goto badcode; 708 MGETHDR(n, M_DONTWAIT, m->m_type); 709 if (n && ICMP6_MAXLEN > MHLEN) { 710 MCLGET(n, M_DONTWAIT); 711 if ((n->m_flags & M_EXT) == 0) { 712 m_free(n); 713 n = NULL; 714 } 715 } 716 if (n == NULL) { 717 /* Give up remote */ 718 break; 719 } 720 m_reset_rcvif(n); 721 n->m_len = 0; 722 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 723 if (maxhlen < 0) 724 break; 725 if (maxhlen > hostnamelen) 726 maxhlen = hostnamelen; 727 /* 728 * Copy IPv6 and ICMPv6 only. 729 */ 730 nip6 = mtod(n, struct ip6_hdr *); 731 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 732 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 733 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 734 p = (u_char *)(nicmp6 + 1); 735 memset(p, 0, 4); 736 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 737 noff = sizeof(struct ip6_hdr); 738 M_COPY_PKTHDR(n, m); /* just for rcvif */ 739 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 740 sizeof(struct icmp6_hdr) + 4 + maxhlen; 741 nicmp6->icmp6_type = ICMP6_WRUREPLY; 742 nicmp6->icmp6_code = 0; 743 } 744 #undef hostnamelen 745 if (n) { 746 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 747 icmp6s[ICMP6_STAT_REFLECT]++; 748 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 749 ICMP6_STAT_PUTREF(); 750 icmp6_reflect(n, noff); 751 } 752 break; 753 } 754 755 case ICMP6_WRUREPLY: 756 if (code != 0) 757 goto badcode; 758 break; 759 760 case ND_ROUTER_SOLICIT: 761 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 762 if (code != 0) 763 goto badcode; 764 if (icmp6len < sizeof(struct nd_router_solicit)) 765 goto badlen; 766 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 767 /* give up local */ 768 nd6_rs_input(m, off, icmp6len); 769 m = NULL; 770 goto freeit; 771 } 772 nd6_rs_input(n, off, icmp6len); 773 /* m stays. */ 774 break; 775 776 case ND_ROUTER_ADVERT: 777 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 778 if (code != 0) 779 goto badcode; 780 if (icmp6len < sizeof(struct nd_router_advert)) 781 goto badlen; 782 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 783 /* give up local */ 784 nd6_ra_input(m, off, icmp6len); 785 m = NULL; 786 goto freeit; 787 } 788 nd6_ra_input(n, off, icmp6len); 789 /* m stays. */ 790 break; 791 792 case ND_NEIGHBOR_SOLICIT: 793 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 794 if (code != 0) 795 goto badcode; 796 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 797 goto badlen; 798 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 799 /* give up local */ 800 nd6_ns_input(m, off, icmp6len); 801 m = NULL; 802 goto freeit; 803 } 804 nd6_ns_input(n, off, icmp6len); 805 /* m stays. */ 806 break; 807 808 case ND_NEIGHBOR_ADVERT: 809 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 810 if (code != 0) 811 goto badcode; 812 if (icmp6len < sizeof(struct nd_neighbor_advert)) 813 goto badlen; 814 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 815 /* give up local */ 816 nd6_na_input(m, off, icmp6len); 817 m = NULL; 818 goto freeit; 819 } 820 nd6_na_input(n, off, icmp6len); 821 /* m stays. */ 822 break; 823 824 case ND_REDIRECT: 825 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 826 if (code != 0) 827 goto badcode; 828 if (icmp6len < sizeof(struct nd_redirect)) 829 goto badlen; 830 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 831 /* give up local */ 832 icmp6_redirect_input(m, off); 833 m = NULL; 834 goto freeit; 835 } 836 icmp6_redirect_input(n, off); 837 /* m stays. */ 838 break; 839 840 case ICMP6_ROUTER_RENUMBERING: 841 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 842 code != ICMP6_ROUTER_RENUMBERING_RESULT) 843 goto badcode; 844 if (icmp6len < sizeof(struct icmp6_router_renum)) 845 goto badlen; 846 break; 847 848 default: 849 nd6log(LOG_DEBUG, "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 850 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 851 ip6_sprintf(&ip6->ip6_dst), 852 rcvif ? rcvif->if_index : 0); 853 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 854 /* ICMPv6 error: MUST deliver it by spec... */ 855 code = PRC_NCMDS; 856 /* deliver */ 857 } else { 858 /* ICMPv6 informational: MUST not deliver */ 859 break; 860 } 861 deliver: 862 if (icmp6_notify_error(m, off, icmp6len, code)) { 863 /* In this case, m should've been freed. */ 864 m_put_rcvif_psref(rcvif, &psref); 865 return (IPPROTO_DONE); 866 } 867 break; 868 869 badcode: 870 ICMP6_STATINC(ICMP6_STAT_BADCODE); 871 break; 872 873 badlen: 874 ICMP6_STATINC(ICMP6_STAT_BADLEN); 875 break; 876 } 877 m_put_rcvif_psref(rcvif, &psref); 878 879 /* deliver the packet to appropriate sockets */ 880 icmp6_rip6_input(&m, *offp); 881 882 return IPPROTO_DONE; 883 884 freeit: 885 m_put_rcvif_psref(rcvif, &psref); 886 m_freem(m); 887 return IPPROTO_DONE; 888 } 889 890 static int 891 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 892 { 893 struct icmp6_hdr *icmp6; 894 struct ip6_hdr *eip6; 895 u_int32_t notifymtu; 896 struct sockaddr_in6 icmp6src, icmp6dst; 897 898 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 899 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 900 goto freeit; 901 } 902 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 903 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 904 if (icmp6 == NULL) { 905 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 906 return (-1); 907 } 908 eip6 = (struct ip6_hdr *)(icmp6 + 1); 909 910 /* Detect the upper level protocol */ 911 { 912 void (*ctlfunc)(int, struct sockaddr *, void *); 913 u_int8_t nxt = eip6->ip6_nxt; 914 int eoff = off + sizeof(struct icmp6_hdr) + 915 sizeof(struct ip6_hdr); 916 struct ip6ctlparam ip6cp; 917 struct in6_addr *finaldst = NULL; 918 int icmp6type = icmp6->icmp6_type; 919 struct ip6_frag *fh; 920 struct ip6_rthdr *rth; 921 struct ip6_rthdr0 *rth0; 922 int rthlen; 923 struct ifnet *rcvif; 924 int s; 925 926 while (1) { /* XXX: should avoid infinite loop explicitly? */ 927 struct ip6_ext *eh; 928 929 switch (nxt) { 930 case IPPROTO_HOPOPTS: 931 case IPPROTO_DSTOPTS: 932 case IPPROTO_AH: 933 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 934 eoff, sizeof(*eh)); 935 if (eh == NULL) { 936 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 937 return (-1); 938 } 939 940 if (nxt == IPPROTO_AH) 941 eoff += (eh->ip6e_len + 2) << 2; 942 else 943 eoff += (eh->ip6e_len + 1) << 3; 944 nxt = eh->ip6e_nxt; 945 break; 946 case IPPROTO_ROUTING: 947 /* 948 * When the erroneous packet contains a 949 * routing header, we should examine the 950 * header to determine the final destination. 951 * Otherwise, we can't properly update 952 * information that depends on the final 953 * destination (e.g. path MTU). 954 */ 955 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 956 eoff, sizeof(*rth)); 957 if (rth == NULL) { 958 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 959 return (-1); 960 } 961 rthlen = (rth->ip6r_len + 1) << 3; 962 /* 963 * XXX: currently there is no 964 * officially defined type other 965 * than type-0. 966 * Note that if the segment left field 967 * is 0, all intermediate hops must 968 * have been passed. 969 */ 970 if (rth->ip6r_segleft && 971 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 972 int hops; 973 974 IP6_EXTHDR_GET(rth0, 975 struct ip6_rthdr0 *, m, 976 eoff, rthlen); 977 if (rth0 == NULL) { 978 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 979 return (-1); 980 } 981 /* just ignore a bogus header */ 982 if ((rth0->ip6r0_len % 2) == 0 && 983 (hops = rth0->ip6r0_len/2)) 984 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 985 } 986 eoff += rthlen; 987 nxt = rth->ip6r_nxt; 988 break; 989 case IPPROTO_FRAGMENT: 990 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 991 eoff, sizeof(*fh)); 992 if (fh == NULL) { 993 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 994 return (-1); 995 } 996 /* 997 * Data after a fragment header is meaningless 998 * unless it is the first fragment, but 999 * we'll go to the notify label for path MTU 1000 * discovery. 1001 */ 1002 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1003 goto notify; 1004 1005 eoff += sizeof(struct ip6_frag); 1006 nxt = fh->ip6f_nxt; 1007 break; 1008 default: 1009 /* 1010 * This case includes ESP and the No Next 1011 * Header. In such cases going to the notify 1012 * label does not have any meaning 1013 * (i.e. ctlfunc will be NULL), but we go 1014 * anyway since we might have to update 1015 * path MTU information. 1016 */ 1017 goto notify; 1018 } 1019 } 1020 notify: 1021 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1022 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1023 if (icmp6 == NULL) { 1024 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1025 return (-1); 1026 } 1027 1028 /* 1029 * retrieve parameters from the inner IPv6 header, and convert 1030 * them into sockaddr structures. 1031 * XXX: there is no guarantee that the source or destination 1032 * addresses of the inner packet are in the same scope zone as 1033 * the addresses of the icmp packet. But there is no other 1034 * way to determine the zone. 1035 */ 1036 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1037 1038 rcvif = m_get_rcvif(m, &s); 1039 sockaddr_in6_init(&icmp6dst, 1040 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1041 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1042 m_put_rcvif(rcvif, &s); 1043 goto freeit; 1044 } 1045 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1046 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1047 m_put_rcvif(rcvif, &s); 1048 goto freeit; 1049 } 1050 m_put_rcvif(rcvif, &s); 1051 1052 icmp6src.sin6_flowinfo = 1053 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1054 1055 if (finaldst == NULL) 1056 finaldst = &eip6->ip6_dst; 1057 ip6cp.ip6c_m = m; 1058 ip6cp.ip6c_icmp6 = icmp6; 1059 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1060 ip6cp.ip6c_off = eoff; 1061 ip6cp.ip6c_finaldst = finaldst; 1062 ip6cp.ip6c_src = &icmp6src; 1063 ip6cp.ip6c_nxt = nxt; 1064 1065 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1066 notifymtu = ntohl(icmp6->icmp6_mtu); 1067 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1068 } 1069 1070 ctlfunc = (void (*)(int, struct sockaddr *, void *)) 1071 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1072 if (ctlfunc) { 1073 (void) (*ctlfunc)(code, sin6tosa(&icmp6dst), 1074 &ip6cp); 1075 } 1076 } 1077 return (0); 1078 1079 freeit: 1080 m_freem(m); 1081 return (-1); 1082 } 1083 1084 void 1085 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1086 { 1087 unsigned long rtcount; 1088 struct icmp6_mtudisc_callback *mc; 1089 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1090 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1091 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1092 u_int mtu = ntohl(icmp6->icmp6_mtu); 1093 struct rtentry *rt = NULL; 1094 struct sockaddr_in6 sin6; 1095 struct ifnet *rcvif; 1096 int s; 1097 1098 /* 1099 * The MTU should not be less than the minimal IPv6 MTU except for the 1100 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1101 * In that one case, the MTU might be less than 1280. 1102 */ 1103 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1104 /* is the mtu even sane? */ 1105 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1106 return; 1107 if (!validated) 1108 return; 1109 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1110 } 1111 1112 /* 1113 * allow non-validated cases if memory is plenty, to make traffic 1114 * from non-connected pcb happy. 1115 */ 1116 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1117 if (validated) { 1118 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) 1119 return; 1120 else if (0 <= icmp6_mtudisc_lowat && 1121 rtcount > icmp6_mtudisc_lowat) { 1122 /* 1123 * XXX nuke a victim, install the new one. 1124 */ 1125 } 1126 } else { 1127 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) 1128 return; 1129 } 1130 1131 memset(&sin6, 0, sizeof(sin6)); 1132 sin6.sin6_family = PF_INET6; 1133 sin6.sin6_len = sizeof(struct sockaddr_in6); 1134 sin6.sin6_addr = *dst; 1135 rcvif = m_get_rcvif(m, &s); 1136 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1137 m_put_rcvif(rcvif, &s); 1138 return; 1139 } 1140 m_put_rcvif(rcvif, &s); 1141 1142 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1143 1144 if (rt && (rt->rt_flags & RTF_HOST) && 1145 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1146 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1147 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1148 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1149 rt->rt_rmx.rmx_mtu = mtu; 1150 } 1151 } 1152 if (rt) { 1153 rtfree(rt); 1154 } 1155 1156 /* 1157 * Notify protocols that the MTU for this destination 1158 * has changed. 1159 */ 1160 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1161 mc = LIST_NEXT(mc, mc_list)) 1162 (*mc->mc_func)(&sin6.sin6_addr); 1163 } 1164 1165 /* 1166 * Process a Node Information Query packet, based on 1167 * draft-ietf-ipngwg-icmp-name-lookups-07. 1168 * 1169 * Spec incompatibilities: 1170 * - IPv6 Subject address handling 1171 * - IPv4 Subject address handling support missing 1172 * - Proxy reply (answer even if it's not for me) 1173 * - joins NI group address at in6_ifattach() time only, does not cope 1174 * with hostname changes by sethostname(3) 1175 */ 1176 static struct mbuf * 1177 ni6_input(struct mbuf *m, int off) 1178 { 1179 struct icmp6_nodeinfo *ni6, *nni6; 1180 struct mbuf *n = NULL; 1181 u_int16_t qtype; 1182 int subjlen; 1183 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1184 struct ni_reply_fqdn *fqdn; 1185 int addrs; /* for NI_QTYPE_NODEADDR */ 1186 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1187 struct sockaddr_in6 sin6; /* ip6_dst */ 1188 struct in6_addr in6_subj; /* subject address */ 1189 struct ip6_hdr *ip6; 1190 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1191 char *subj = NULL; 1192 struct ifnet *rcvif; 1193 int s, ss; 1194 struct ifaddr *ifa; 1195 struct psref psref; 1196 1197 ip6 = mtod(m, struct ip6_hdr *); 1198 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1199 if (ni6 == NULL) { 1200 /* m is already reclaimed */ 1201 return NULL; 1202 } 1203 1204 /* 1205 * Validate IPv6 destination address. 1206 * 1207 * The Responder must discard the Query without further processing 1208 * unless it is one of the Responder's unicast or anycast addresses, or 1209 * a link-local scope multicast address which the Responder has joined. 1210 * [icmp-name-lookups-07, Section 4.] 1211 */ 1212 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1213 /* XXX scopeid */ 1214 ss = pserialize_read_enter(); 1215 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1216 if (ifa != NULL) 1217 ; /* unicast/anycast, fine */ 1218 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1219 ; /* link-local multicast, fine */ 1220 else { 1221 pserialize_read_exit(ss); 1222 goto bad; 1223 } 1224 pserialize_read_exit(ss); 1225 1226 /* validate query Subject field. */ 1227 qtype = ntohs(ni6->ni_qtype); 1228 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1229 switch (qtype) { 1230 case NI_QTYPE_NOOP: 1231 case NI_QTYPE_SUPTYPES: 1232 /* 07 draft */ 1233 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1234 break; 1235 /* FALLTHROUGH */ 1236 case NI_QTYPE_FQDN: 1237 case NI_QTYPE_NODEADDR: 1238 case NI_QTYPE_IPV4ADDR: 1239 switch (ni6->ni_code) { 1240 case ICMP6_NI_SUBJ_IPV6: 1241 #if ICMP6_NI_SUBJ_IPV6 != 0 1242 case 0: 1243 #endif 1244 /* 1245 * backward compatibility - try to accept 03 draft 1246 * format, where no Subject is present. 1247 */ 1248 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1249 subjlen == 0) { 1250 oldfqdn++; 1251 break; 1252 } 1253 #if ICMP6_NI_SUBJ_IPV6 != 0 1254 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1255 goto bad; 1256 #endif 1257 1258 if (subjlen != sizeof(sin6.sin6_addr)) 1259 goto bad; 1260 1261 /* 1262 * Validate Subject address. 1263 * 1264 * Not sure what exactly "address belongs to the node" 1265 * means in the spec, is it just unicast, or what? 1266 * 1267 * At this moment we consider Subject address as 1268 * "belong to the node" if the Subject address equals 1269 * to the IPv6 destination address; validation for 1270 * IPv6 destination address should have done enough 1271 * check for us. 1272 * 1273 * We do not do proxy at this moment. 1274 */ 1275 /* m_pulldown instead of copy? */ 1276 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1277 subjlen, (void *)&in6_subj); 1278 rcvif = m_get_rcvif(m, &s); 1279 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1280 m_put_rcvif(rcvif, &s); 1281 goto bad; 1282 } 1283 m_put_rcvif(rcvif, &s); 1284 1285 subj = (char *)&in6_subj; 1286 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1287 break; 1288 1289 /* 1290 * XXX if we are to allow other cases, we should really 1291 * be careful about scope here. 1292 * basically, we should disallow queries toward IPv6 1293 * destination X with subject Y, if scope(X) > scope(Y). 1294 * if we allow scope(X) > scope(Y), it will result in 1295 * information leakage across scope boundary. 1296 */ 1297 goto bad; 1298 1299 case ICMP6_NI_SUBJ_FQDN: 1300 /* 1301 * Validate Subject name with gethostname(3). 1302 * 1303 * The behavior may need some debate, since: 1304 * - we are not sure if the node has FQDN as 1305 * hostname (returned by gethostname(3)). 1306 * - the code does wildcard match for truncated names. 1307 * however, we are not sure if we want to perform 1308 * wildcard match, if gethostname(3) side has 1309 * truncated hostname. 1310 */ 1311 n = ni6_nametodns(hostname, hostnamelen, 0); 1312 if (!n || n->m_next || n->m_len == 0) 1313 goto bad; 1314 IP6_EXTHDR_GET(subj, char *, m, 1315 off + sizeof(struct icmp6_nodeinfo), subjlen); 1316 if (subj == NULL) 1317 goto bad; 1318 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1319 n->m_len)) { 1320 goto bad; 1321 } 1322 m_freem(n); 1323 n = NULL; 1324 break; 1325 1326 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1327 default: 1328 goto bad; 1329 } 1330 break; 1331 } 1332 1333 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1334 switch (qtype) { 1335 case NI_QTYPE_FQDN: 1336 if ((icmp6_nodeinfo & 1) == 0) 1337 goto bad; 1338 break; 1339 case NI_QTYPE_NODEADDR: 1340 case NI_QTYPE_IPV4ADDR: 1341 if ((icmp6_nodeinfo & 2) == 0) 1342 goto bad; 1343 break; 1344 } 1345 1346 /* guess reply length */ 1347 switch (qtype) { 1348 case NI_QTYPE_NOOP: 1349 break; /* no reply data */ 1350 case NI_QTYPE_SUPTYPES: 1351 replylen += sizeof(u_int32_t); 1352 break; 1353 case NI_QTYPE_FQDN: 1354 /* XXX will append an mbuf */ 1355 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1356 break; 1357 case NI_QTYPE_NODEADDR: 1358 addrs = ni6_addrs(ni6, m, &ifp, subj, &psref); 1359 if ((replylen += addrs * (sizeof(struct in6_addr) + 1360 sizeof(u_int32_t))) > MCLBYTES) 1361 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1362 break; 1363 case NI_QTYPE_IPV4ADDR: 1364 /* unsupported - should respond with unknown Qtype? */ 1365 goto bad; 1366 default: 1367 /* 1368 * XXX: We must return a reply with the ICMP6 code 1369 * `unknown Qtype' in this case. However we regard the case 1370 * as an FQDN query for backward compatibility. 1371 * Older versions set a random value to this field, 1372 * so it rarely varies in the defined qtypes. 1373 * But the mechanism is not reliable... 1374 * maybe we should obsolete older versions. 1375 */ 1376 qtype = NI_QTYPE_FQDN; 1377 /* XXX will append an mbuf */ 1378 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1379 oldfqdn++; 1380 break; 1381 } 1382 1383 /* allocate an mbuf to reply. */ 1384 MGETHDR(n, M_DONTWAIT, m->m_type); 1385 if (n == NULL) { 1386 if_put(ifp, &psref); 1387 m_freem(m); 1388 return (NULL); 1389 } 1390 M_MOVE_PKTHDR(n, m); /* just for rcvif */ 1391 if (replylen > MHLEN) { 1392 if (replylen > MCLBYTES) { 1393 /* 1394 * XXX: should we try to allocate more? But MCLBYTES 1395 * is probably much larger than IPV6_MMTU... 1396 */ 1397 goto bad; 1398 } 1399 MCLGET(n, M_DONTWAIT); 1400 if ((n->m_flags & M_EXT) == 0) { 1401 goto bad; 1402 } 1403 } 1404 n->m_pkthdr.len = n->m_len = replylen; 1405 1406 /* copy mbuf header and IPv6 + Node Information base headers */ 1407 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1408 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1409 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1410 1411 /* qtype dependent procedure */ 1412 switch (qtype) { 1413 case NI_QTYPE_NOOP: 1414 nni6->ni_code = ICMP6_NI_SUCCESS; 1415 nni6->ni_flags = 0; 1416 break; 1417 case NI_QTYPE_SUPTYPES: 1418 { 1419 u_int32_t v; 1420 nni6->ni_code = ICMP6_NI_SUCCESS; 1421 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1422 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1423 v = (u_int32_t)htonl(0x0000000f); 1424 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1425 break; 1426 } 1427 case NI_QTYPE_FQDN: 1428 nni6->ni_code = ICMP6_NI_SUCCESS; 1429 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1430 sizeof(struct ip6_hdr) + 1431 sizeof(struct icmp6_nodeinfo)); 1432 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1433 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1434 /* 1435 * XXX do we really have FQDN in variable "hostname"? 1436 */ 1437 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1438 if (n->m_next == NULL) 1439 goto bad; 1440 /* XXX we assume that n->m_next is not a chain */ 1441 if (n->m_next->m_next != NULL) 1442 goto bad; 1443 n->m_pkthdr.len += n->m_next->m_len; 1444 break; 1445 case NI_QTYPE_NODEADDR: 1446 { 1447 int lenlim, copied; 1448 1449 nni6->ni_code = ICMP6_NI_SUCCESS; 1450 n->m_pkthdr.len = n->m_len = 1451 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1452 lenlim = M_TRAILINGSPACE(n); 1453 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1454 if_put(ifp, &psref); 1455 ifp = NULL; 1456 /* XXX: reset mbuf length */ 1457 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1458 sizeof(struct icmp6_nodeinfo) + copied; 1459 break; 1460 } 1461 default: 1462 break; /* XXX impossible! */ 1463 } 1464 1465 nni6->ni_type = ICMP6_NI_REPLY; 1466 m_freem(m); 1467 return (n); 1468 1469 bad: 1470 if_put(ifp, &psref); 1471 m_freem(m); 1472 if (n) 1473 m_freem(n); 1474 return (NULL); 1475 } 1476 #undef hostnamelen 1477 1478 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1479 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1480 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1481 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1482 1483 /* 1484 * make a mbuf with DNS-encoded string. no compression support. 1485 * 1486 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1487 * treated as truncated name (two \0 at the end). this is a wild guess. 1488 * 1489 * old - return pascal string if non-zero 1490 */ 1491 static struct mbuf * 1492 ni6_nametodns(const char *name, int namelen, int old) 1493 { 1494 struct mbuf *m; 1495 char *cp, *ep; 1496 const char *p, *q; 1497 int i, len, nterm; 1498 1499 if (old) 1500 len = namelen + 1; 1501 else 1502 len = MCLBYTES; 1503 1504 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1505 MGET(m, M_DONTWAIT, MT_DATA); 1506 if (m && len > MLEN) { 1507 MCLGET(m, M_DONTWAIT); 1508 if ((m->m_flags & M_EXT) == 0) 1509 goto fail; 1510 } 1511 if (!m) 1512 goto fail; 1513 m->m_next = NULL; 1514 1515 if (old) { 1516 m->m_len = len; 1517 *mtod(m, char *) = namelen; 1518 bcopy(name, mtod(m, char *) + 1, namelen); 1519 return m; 1520 } else { 1521 m->m_len = 0; 1522 cp = mtod(m, char *); 1523 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1524 1525 /* if not certain about my name, return empty buffer */ 1526 if (namelen == 0) 1527 return m; 1528 1529 /* 1530 * guess if it looks like shortened hostname, or FQDN. 1531 * shortened hostname needs two trailing "\0". 1532 */ 1533 i = 0; 1534 for (p = name; p < name + namelen; p++) { 1535 if (*p == '.') 1536 i++; 1537 } 1538 if (i < 2) 1539 nterm = 2; 1540 else 1541 nterm = 1; 1542 1543 p = name; 1544 while (cp < ep && p < name + namelen) { 1545 i = 0; 1546 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1547 i++; 1548 /* result does not fit into mbuf */ 1549 if (cp + i + 1 >= ep) 1550 goto fail; 1551 /* 1552 * DNS label length restriction, RFC1035 page 8. 1553 * "i == 0" case is included here to avoid returning 1554 * 0-length label on "foo..bar". 1555 */ 1556 if (i <= 0 || i >= 64) 1557 goto fail; 1558 *cp++ = i; 1559 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1560 goto fail; 1561 while (i > 0) { 1562 if (!isalnum(*p) && *p != '-') 1563 goto fail; 1564 if (isupper(*p)) { 1565 *cp++ = tolower(*p); 1566 p++; 1567 } else 1568 *cp++ = *p++; 1569 i--; 1570 } 1571 p = q; 1572 if (p < name + namelen && *p == '.') 1573 p++; 1574 } 1575 /* termination */ 1576 if (cp + nterm >= ep) 1577 goto fail; 1578 while (nterm-- > 0) 1579 *cp++ = '\0'; 1580 m->m_len = cp - mtod(m, char *); 1581 return m; 1582 } 1583 1584 panic("should not reach here"); 1585 /* NOTREACHED */ 1586 1587 fail: 1588 if (m) 1589 m_freem(m); 1590 return NULL; 1591 } 1592 1593 /* 1594 * check if two DNS-encoded string matches. takes care of truncated 1595 * form (with \0\0 at the end). no compression support. 1596 * XXX upper/lowercase match (see RFC2065) 1597 */ 1598 static int 1599 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1600 { 1601 const char *a0, *b0; 1602 int l; 1603 1604 /* simplest case - need validation? */ 1605 if (alen == blen && memcmp(a, b, alen) == 0) 1606 return 1; 1607 1608 a0 = a; 1609 b0 = b; 1610 1611 /* termination is mandatory */ 1612 if (alen < 2 || blen < 2) 1613 return 0; 1614 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1615 return 0; 1616 alen--; 1617 blen--; 1618 1619 while (a - a0 < alen && b - b0 < blen) { 1620 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1621 return 0; 1622 1623 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1624 return 0; 1625 /* we don't support compression yet */ 1626 if (a[0] >= 64 || b[0] >= 64) 1627 return 0; 1628 1629 /* truncated case */ 1630 if (a[0] == 0 && a - a0 == alen - 1) 1631 return 1; 1632 if (b[0] == 0 && b - b0 == blen - 1) 1633 return 1; 1634 if (a[0] == 0 || b[0] == 0) 1635 return 0; 1636 1637 if (a[0] != b[0]) 1638 return 0; 1639 l = a[0]; 1640 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1641 return 0; 1642 if (memcmp(a + 1, b + 1, l) != 0) 1643 return 0; 1644 1645 a += 1 + l; 1646 b += 1 + l; 1647 } 1648 1649 if (a - a0 == alen && b - b0 == blen) 1650 return 1; 1651 else 1652 return 0; 1653 } 1654 1655 /* 1656 * calculate the number of addresses to be returned in the node info reply. 1657 */ 1658 static int 1659 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, 1660 struct ifnet **ifpp, char *subj, struct psref *psref) 1661 { 1662 struct ifnet *ifp; 1663 struct in6_ifaddr *ia6; 1664 struct ifaddr *ifa; 1665 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1666 int addrs = 0, addrsofif, iffound = 0; 1667 int niflags = ni6->ni_flags; 1668 int s; 1669 1670 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1671 switch (ni6->ni_code) { 1672 case ICMP6_NI_SUBJ_IPV6: 1673 if (subj == NULL) /* must be impossible... */ 1674 return (0); 1675 subj_ip6 = (struct sockaddr_in6 *)subj; 1676 break; 1677 default: 1678 /* 1679 * XXX: we only support IPv6 subject address for 1680 * this Qtype. 1681 */ 1682 return (0); 1683 } 1684 } 1685 1686 s = pserialize_read_enter(); 1687 IFNET_READER_FOREACH(ifp) { 1688 addrsofif = 0; 1689 IFADDR_READER_FOREACH(ifa, ifp) { 1690 if (ifa->ifa_addr->sa_family != AF_INET6) 1691 continue; 1692 ia6 = (struct in6_ifaddr *)ifa; 1693 1694 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1695 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1696 &ia6->ia_addr.sin6_addr)) 1697 iffound = 1; 1698 1699 /* 1700 * IPv4-mapped addresses can only be returned by a 1701 * Node Information proxy, since they represent 1702 * addresses of IPv4-only nodes, which perforce do 1703 * not implement this protocol. 1704 * [icmp-name-lookups-07, Section 5.4] 1705 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1706 * this function at this moment. 1707 */ 1708 1709 /* What do we have to do about ::1? */ 1710 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1711 case IPV6_ADDR_SCOPE_LINKLOCAL: 1712 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1713 continue; 1714 break; 1715 case IPV6_ADDR_SCOPE_SITELOCAL: 1716 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1717 continue; 1718 break; 1719 case IPV6_ADDR_SCOPE_GLOBAL: 1720 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1721 continue; 1722 break; 1723 default: 1724 continue; 1725 } 1726 1727 /* 1728 * check if anycast is okay. 1729 * XXX: just experimental. not in the spec. 1730 */ 1731 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1732 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1733 continue; /* we need only unicast addresses */ 1734 1735 addrsofif++; /* count the address */ 1736 } 1737 if (iffound) { 1738 if_acquire_NOMPSAFE(ifp, psref); 1739 pserialize_read_exit(s); 1740 *ifpp = ifp; 1741 return (addrsofif); 1742 } 1743 1744 addrs += addrsofif; 1745 } 1746 pserialize_read_exit(s); 1747 1748 return (addrs); 1749 } 1750 1751 static int 1752 ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1753 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1754 int resid) 1755 { 1756 struct ifnet *ifp; 1757 struct in6_ifaddr *ia6; 1758 struct ifaddr *ifa; 1759 struct ifnet *ifp_dep = NULL; 1760 int copied = 0, allow_deprecated = 0; 1761 u_char *cp = (u_char *)(nni6 + 1); 1762 int niflags = ni6->ni_flags; 1763 u_int32_t ltime; 1764 int s; 1765 1766 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1767 return (0); /* needless to copy */ 1768 1769 s = pserialize_read_enter(); 1770 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1771 again: 1772 1773 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1774 { 1775 IFADDR_READER_FOREACH(ifa, ifp) { 1776 if (ifa->ifa_addr->sa_family != AF_INET6) 1777 continue; 1778 ia6 = (struct in6_ifaddr *)ifa; 1779 1780 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1781 allow_deprecated == 0) { 1782 /* 1783 * prefererred address should be put before 1784 * deprecated addresses. 1785 */ 1786 1787 /* record the interface for later search */ 1788 if (ifp_dep == NULL) 1789 ifp_dep = ifp; 1790 1791 continue; 1792 } 1793 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1794 allow_deprecated != 0) 1795 continue; /* we now collect deprecated addrs */ 1796 1797 /* What do we have to do about ::1? */ 1798 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1799 case IPV6_ADDR_SCOPE_LINKLOCAL: 1800 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1801 continue; 1802 break; 1803 case IPV6_ADDR_SCOPE_SITELOCAL: 1804 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1805 continue; 1806 break; 1807 case IPV6_ADDR_SCOPE_GLOBAL: 1808 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1809 continue; 1810 break; 1811 default: 1812 continue; 1813 } 1814 1815 /* 1816 * check if anycast is okay. 1817 * XXX: just experimental. not in the spec. 1818 */ 1819 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1820 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1821 continue; 1822 1823 /* now we can copy the address */ 1824 if (resid < sizeof(struct in6_addr) + 1825 sizeof(u_int32_t)) { 1826 /* 1827 * We give up much more copy. 1828 * Set the truncate flag and return. 1829 */ 1830 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1831 goto out; 1832 } 1833 1834 /* 1835 * Set the TTL of the address. 1836 * The TTL value should be one of the following 1837 * according to the specification: 1838 * 1839 * 1. The remaining lifetime of a DHCP lease on the 1840 * address, or 1841 * 2. The remaining Valid Lifetime of a prefix from 1842 * which the address was derived through Stateless 1843 * Autoconfiguration. 1844 * 1845 * Note that we currently do not support stateful 1846 * address configuration by DHCPv6, so the former 1847 * case can't happen. 1848 * 1849 * TTL must be 2^31 > TTL >= 0. 1850 */ 1851 if (ia6->ia6_lifetime.ia6t_expire == 0) 1852 ltime = ND6_INFINITE_LIFETIME; 1853 else { 1854 if (ia6->ia6_lifetime.ia6t_expire > 1855 time_uptime) 1856 ltime = ia6->ia6_lifetime.ia6t_expire - 1857 time_uptime; 1858 else 1859 ltime = 0; 1860 } 1861 if (ltime > 0x7fffffff) 1862 ltime = 0x7fffffff; 1863 ltime = htonl(ltime); 1864 1865 bcopy(<ime, cp, sizeof(u_int32_t)); 1866 cp += sizeof(u_int32_t); 1867 1868 /* copy the address itself */ 1869 bcopy(&ia6->ia_addr.sin6_addr, cp, 1870 sizeof(struct in6_addr)); 1871 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1872 cp += sizeof(struct in6_addr); 1873 1874 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1875 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1876 } 1877 if (ifp0) /* we need search only on the specified IF */ 1878 break; 1879 } 1880 1881 if (allow_deprecated == 0 && ifp_dep != NULL) { 1882 ifp = ifp_dep; 1883 allow_deprecated = 1; 1884 1885 goto again; 1886 } 1887 out: 1888 pserialize_read_exit(s); 1889 return (copied); 1890 } 1891 1892 /* 1893 * XXX almost dup'ed code with rip6_input. 1894 */ 1895 static int 1896 icmp6_rip6_input(struct mbuf **mp, int off) 1897 { 1898 struct mbuf *m = *mp; 1899 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1900 struct inpcb_hdr *inph; 1901 struct in6pcb *in6p; 1902 struct in6pcb *last = NULL; 1903 struct sockaddr_in6 rip6src; 1904 struct icmp6_hdr *icmp6; 1905 struct mbuf *opts = NULL; 1906 1907 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1908 if (icmp6 == NULL) { 1909 /* m is already reclaimed */ 1910 return IPPROTO_DONE; 1911 } 1912 1913 /* 1914 * XXX: the address may have embedded scope zone ID, which should be 1915 * hidden from applications. 1916 */ 1917 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1918 if (sa6_recoverscope(&rip6src)) { 1919 m_freem(m); 1920 return (IPPROTO_DONE); 1921 } 1922 1923 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1924 in6p = (struct in6pcb *)inph; 1925 if (in6p->in6p_af != AF_INET6) 1926 continue; 1927 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1928 continue; 1929 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1930 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1931 continue; 1932 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1933 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1934 continue; 1935 if (in6p->in6p_icmp6filt 1936 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1937 in6p->in6p_icmp6filt)) 1938 continue; 1939 if (last) { 1940 struct mbuf *n; 1941 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1942 if (last->in6p_flags & IN6P_CONTROLOPTS) 1943 ip6_savecontrol(last, &opts, ip6, n); 1944 /* strip intermediate headers */ 1945 m_adj(n, off); 1946 if (sbappendaddr(&last->in6p_socket->so_rcv, 1947 sin6tosa(&rip6src), n, opts) == 0) { 1948 /* should notify about lost packet */ 1949 m_freem(n); 1950 if (opts) 1951 m_freem(opts); 1952 } else 1953 sorwakeup(last->in6p_socket); 1954 opts = NULL; 1955 } 1956 } 1957 last = in6p; 1958 } 1959 if (last) { 1960 if (last->in6p_flags & IN6P_CONTROLOPTS) 1961 ip6_savecontrol(last, &opts, ip6, m); 1962 /* strip intermediate headers */ 1963 m_adj(m, off); 1964 if (sbappendaddr(&last->in6p_socket->so_rcv, 1965 sin6tosa(&rip6src), m, opts) == 0) { 1966 m_freem(m); 1967 if (opts) 1968 m_freem(opts); 1969 } else 1970 sorwakeup(last->in6p_socket); 1971 } else { 1972 m_freem(m); 1973 IP6_STATDEC(IP6_STAT_DELIVERED); 1974 } 1975 return IPPROTO_DONE; 1976 } 1977 1978 /* 1979 * Reflect the ip6 packet back to the source. 1980 * OFF points to the icmp6 header, counted from the top of the mbuf. 1981 * 1982 * Note: RFC 1885 required that an echo reply should be truncated if it 1983 * did not fit in with (return) path MTU, and KAME code supported the 1984 * behavior. However, as a clarification after the RFC, this limitation 1985 * was removed in a revised version of the spec, RFC 2463. We had kept the 1986 * old behavior, with a (non-default) ifdef block, while the new version of 1987 * the spec was an internet-draft status, and even after the new RFC was 1988 * published. But it would rather make sense to clean the obsoleted part 1989 * up, and to make the code simpler at this stage. 1990 */ 1991 void 1992 icmp6_reflect(struct mbuf *m, size_t off) 1993 { 1994 struct ip6_hdr *ip6; 1995 struct icmp6_hdr *icmp6; 1996 const struct in6_ifaddr *ia; 1997 const struct ip6aux *ip6a; 1998 int plen; 1999 int type, code; 2000 struct ifnet *outif = NULL; 2001 struct in6_addr origdst; 2002 const struct in6_addr *src = NULL; 2003 struct ifnet *rcvif; 2004 int s; 2005 2006 /* too short to reflect */ 2007 if (off < sizeof(struct ip6_hdr)) { 2008 nd6log(LOG_DEBUG, 2009 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2010 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2011 __FILE__, __LINE__); 2012 goto bad; 2013 } 2014 2015 /* 2016 * If there are extra headers between IPv6 and ICMPv6, strip 2017 * off that header first. 2018 */ 2019 #ifdef DIAGNOSTIC 2020 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2021 panic("assumption failed in icmp6_reflect"); 2022 #endif 2023 if (off > sizeof(struct ip6_hdr)) { 2024 size_t l; 2025 struct ip6_hdr nip6; 2026 2027 l = off - sizeof(struct ip6_hdr); 2028 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2029 m_adj(m, l); 2030 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2031 if (m->m_len < l) { 2032 if ((m = m_pullup(m, l)) == NULL) 2033 return; 2034 } 2035 bcopy((void *)&nip6, mtod(m, void *), sizeof(nip6)); 2036 } else /* off == sizeof(struct ip6_hdr) */ { 2037 size_t l; 2038 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2039 if (m->m_len < l) { 2040 if ((m = m_pullup(m, l)) == NULL) 2041 return; 2042 } 2043 } 2044 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2045 ip6 = mtod(m, struct ip6_hdr *); 2046 ip6->ip6_nxt = IPPROTO_ICMPV6; 2047 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2048 type = icmp6->icmp6_type; /* keep type for statistics */ 2049 code = icmp6->icmp6_code; /* ditto. */ 2050 2051 origdst = ip6->ip6_dst; 2052 /* 2053 * ip6_input() drops a packet if its src is multicast. 2054 * So, the src is never multicast. 2055 */ 2056 ip6->ip6_dst = ip6->ip6_src; 2057 2058 /* 2059 * If the incoming packet was addressed directly to us (i.e. unicast), 2060 * use dst as the src for the reply. 2061 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2062 * (for example) when we encounter an error while forwarding procedure 2063 * destined to a duplicated address of ours. 2064 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2065 * procedure of an outgoing packet of our own, in which case we need 2066 * to search in the ifaddr list. 2067 */ 2068 if (IN6_IS_ADDR_MULTICAST(&origdst)) 2069 ; 2070 else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2071 if ((ip6a->ip6a_flags & 2072 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) 2073 src = &ip6a->ip6a_src; 2074 } else { 2075 union { 2076 struct sockaddr_in6 sin6; 2077 struct sockaddr sa; 2078 } u; 2079 int _s; 2080 struct ifaddr *ifa; 2081 2082 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2083 2084 _s = pserialize_read_enter(); 2085 ifa = ifa_ifwithaddr(&u.sa); 2086 2087 if (ifa != NULL) { 2088 ia = ifatoia6(ifa); 2089 if ((ia->ia6_flags & 2090 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) 2091 src = &ia->ia_addr.sin6_addr; 2092 } 2093 pserialize_read_exit(_s); 2094 } 2095 2096 if (src == NULL) { 2097 int e; 2098 struct sockaddr_in6 sin6; 2099 struct route ro; 2100 2101 /* 2102 * This case matches to multicasts, our anycast, or unicasts 2103 * that we do not own. Select a source address based on the 2104 * source address of the erroneous packet. 2105 */ 2106 /* zone ID should be embedded */ 2107 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2108 2109 memset(&ro, 0, sizeof(ro)); 2110 src = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, &e); 2111 rtcache_free(&ro); 2112 if (src == NULL) { 2113 nd6log(LOG_DEBUG, 2114 "source can't be determined: " 2115 "dst=%s, error=%d\n", 2116 ip6_sprintf(&sin6.sin6_addr), e); 2117 goto bad; 2118 } 2119 } 2120 2121 ip6->ip6_src = *src; 2122 ip6->ip6_flow = 0; 2123 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2124 ip6->ip6_vfc |= IPV6_VERSION; 2125 ip6->ip6_nxt = IPPROTO_ICMPV6; 2126 rcvif = m_get_rcvif(m, &s); 2127 if (rcvif) { 2128 /* XXX: This may not be the outgoing interface */ 2129 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2130 } else 2131 ip6->ip6_hlim = ip6_defhlim; 2132 m_put_rcvif(rcvif, &s); 2133 2134 m->m_pkthdr.csum_flags = 0; 2135 icmp6->icmp6_cksum = 0; 2136 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2137 sizeof(struct ip6_hdr), plen); 2138 2139 /* 2140 * XXX option handling 2141 */ 2142 2143 m->m_flags &= ~(M_BCAST|M_MCAST); 2144 2145 /* 2146 * To avoid a "too big" situation at an intermediate router 2147 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2148 * Note that only echo and node information replies are affected, 2149 * since the length of ICMP6 errors is limited to the minimum MTU. 2150 */ 2151 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) 2152 != 0 && outif) 2153 icmp6_ifstat_inc(outif, ifs6_out_error); 2154 if (outif) 2155 icmp6_ifoutstat_inc(outif, type, code); 2156 2157 return; 2158 2159 bad: 2160 m_freem(m); 2161 return; 2162 } 2163 2164 static const char * 2165 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 2166 struct in6_addr *tgt6) 2167 { 2168 static char buf[1024]; 2169 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2170 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2171 return buf; 2172 } 2173 2174 void 2175 icmp6_redirect_input(struct mbuf *m, int off) 2176 { 2177 struct ifnet *ifp; 2178 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2179 struct nd_redirect *nd_rd; 2180 int icmp6len = ntohs(ip6->ip6_plen); 2181 char *lladdr = NULL; 2182 int lladdrlen = 0; 2183 struct rtentry *rt = NULL; 2184 int is_router; 2185 int is_onlink; 2186 struct in6_addr src6 = ip6->ip6_src; 2187 struct in6_addr redtgt6; 2188 struct in6_addr reddst6; 2189 union nd_opts ndopts; 2190 struct psref psref; 2191 2192 ifp = m_get_rcvif_psref(m, &psref); 2193 if (ifp == NULL) 2194 goto freeit; 2195 2196 /* XXX if we are router, we don't update route by icmp6 redirect */ 2197 if (ip6_forwarding) 2198 goto freeit; 2199 if (!icmp6_rediraccept) 2200 goto freeit; 2201 2202 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2203 if (nd_rd == NULL) { 2204 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2205 m_put_rcvif_psref(ifp, &psref); 2206 return; 2207 } 2208 redtgt6 = nd_rd->nd_rd_target; 2209 reddst6 = nd_rd->nd_rd_dst; 2210 2211 if (in6_setscope(&redtgt6, ifp, NULL) || 2212 in6_setscope(&reddst6, ifp, NULL)) { 2213 goto freeit; 2214 } 2215 2216 /* validation */ 2217 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2218 nd6log(LOG_ERR, 2219 "ICMP6 redirect sent from %s rejected; " 2220 "must be from linklocal\n", ip6_sprintf(&src6)); 2221 goto bad; 2222 } 2223 if (ip6->ip6_hlim != 255) { 2224 nd6log(LOG_ERR, 2225 "ICMP6 redirect sent from %s rejected; " 2226 "hlim=%d (must be 255)\n", 2227 ip6_sprintf(&src6), ip6->ip6_hlim); 2228 goto bad; 2229 } 2230 { 2231 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2232 struct sockaddr_in6 sin6; 2233 struct in6_addr *gw6; 2234 2235 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2236 rt = rtalloc1(sin6tosa(&sin6), 0); 2237 if (rt) { 2238 if (rt->rt_gateway == NULL || 2239 rt->rt_gateway->sa_family != AF_INET6) { 2240 nd6log(LOG_ERR, 2241 "ICMP6 redirect rejected; no route " 2242 "with inet6 gateway found for redirect dst: %s\n", 2243 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2244 rtfree(rt); 2245 goto bad; 2246 } 2247 2248 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2249 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2250 nd6log(LOG_ERR, 2251 "ICMP6 redirect rejected; " 2252 "not equal to gw-for-src=%s (must be same): %s\n", 2253 ip6_sprintf(gw6), 2254 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2255 rtfree(rt); 2256 goto bad; 2257 } 2258 } else { 2259 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2260 "no route found for redirect dst: %s\n", 2261 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2262 goto bad; 2263 } 2264 rtfree(rt); 2265 rt = NULL; 2266 } 2267 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2268 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2269 "redirect dst must be unicast: %s\n", 2270 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2271 goto bad; 2272 } 2273 2274 is_router = is_onlink = 0; 2275 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2276 is_router = 1; /* router case */ 2277 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2278 is_onlink = 1; /* on-link destination case */ 2279 if (!is_router && !is_onlink) { 2280 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2281 "neither router case nor onlink case: %s\n", 2282 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2283 goto bad; 2284 } 2285 /* validation passed */ 2286 2287 icmp6len -= sizeof(*nd_rd); 2288 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2289 if (nd6_options(&ndopts) < 0) { 2290 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2291 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2292 /* nd6_options have incremented stats */ 2293 goto freeit; 2294 } 2295 2296 if (ndopts.nd_opts_tgt_lladdr) { 2297 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2298 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2299 } 2300 2301 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2302 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2303 "(if %d, icmp6 packet %d): %s\n", 2304 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2305 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2306 goto bad; 2307 } 2308 2309 /* RFC 2461 8.3 */ 2310 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2311 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2312 2313 m_put_rcvif_psref(ifp, &psref); 2314 ifp = NULL; 2315 2316 if (!is_onlink) { /* better router case. perform rtredirect. */ 2317 /* perform rtredirect */ 2318 struct sockaddr_in6 sdst; 2319 struct sockaddr_in6 sgw; 2320 struct sockaddr_in6 ssrc; 2321 unsigned long rtcount; 2322 struct rtentry *newrt = NULL; 2323 2324 /* 2325 * do not install redirect route, if the number of entries 2326 * is too much (> hiwat). note that, the node (= host) will 2327 * work just fine even if we do not install redirect route 2328 * (there will be additional hops, though). 2329 */ 2330 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2331 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) 2332 goto freeit; 2333 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) 2334 goto freeit; 2335 else if (0 <= icmp6_redirect_lowat && 2336 rtcount > icmp6_redirect_lowat) { 2337 /* 2338 * XXX nuke a victim, install the new one. 2339 */ 2340 } 2341 2342 memset(&sdst, 0, sizeof(sdst)); 2343 memset(&sgw, 0, sizeof(sgw)); 2344 memset(&ssrc, 0, sizeof(ssrc)); 2345 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2346 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2347 sizeof(struct sockaddr_in6); 2348 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2349 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2350 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2351 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2352 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), 2353 &newrt); 2354 2355 if (newrt) { 2356 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2357 icmp6_redirect_timeout_q); 2358 rtfree(newrt); 2359 } 2360 } 2361 /* finally update cached route in each socket via pfctlinput */ 2362 { 2363 struct sockaddr_in6 sdst; 2364 2365 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2366 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2367 #if defined(IPSEC) 2368 if (ipsec_used) 2369 key_sa_routechange(sin6tosa(&sdst)); 2370 #endif 2371 } 2372 2373 freeit: 2374 if (ifp != NULL) 2375 m_put_rcvif_psref(ifp, &psref); 2376 m_freem(m); 2377 return; 2378 2379 bad: 2380 m_put_rcvif_psref(ifp, &psref); 2381 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2382 m_freem(m); 2383 } 2384 2385 void 2386 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2387 { 2388 struct ifnet *ifp; /* my outgoing interface */ 2389 struct in6_addr *ifp_ll6; 2390 struct in6_addr *nexthop; 2391 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2392 struct mbuf *m = NULL; /* newly allocated one */ 2393 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2394 struct nd_redirect *nd_rd; 2395 size_t maxlen; 2396 u_char *p; 2397 struct sockaddr_in6 src_sa; 2398 2399 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2400 2401 /* if we are not router, we don't send icmp6 redirect */ 2402 if (!ip6_forwarding) 2403 goto fail; 2404 2405 /* sanity check */ 2406 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2407 goto fail; 2408 2409 /* 2410 * Address check: 2411 * the source address must identify a neighbor, and 2412 * the destination address must not be a multicast address 2413 * [RFC 2461, sec 8.2] 2414 */ 2415 sip6 = mtod(m0, struct ip6_hdr *); 2416 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2417 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2418 goto fail; 2419 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2420 goto fail; /* what should we do here? */ 2421 2422 /* rate limit */ 2423 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2424 goto fail; 2425 2426 /* 2427 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2428 * we almost always ask for an mbuf cluster for simplicity. 2429 * (MHLEN < IPV6_MMTU is almost always true) 2430 */ 2431 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2432 if (m && IPV6_MMTU >= MHLEN) { 2433 #if IPV6_MMTU >= MCLBYTES 2434 _MCLGET(m, mcl_cache, IPV6_MMTU, M_DONTWAIT); 2435 #else 2436 MCLGET(m, M_DONTWAIT); 2437 #endif 2438 } 2439 2440 if (!m) 2441 goto fail; 2442 m_reset_rcvif(m); 2443 m->m_len = 0; 2444 maxlen = M_TRAILINGSPACE(m); 2445 maxlen = min(IPV6_MMTU, maxlen); 2446 /* just for safety */ 2447 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2448 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2449 goto fail; 2450 } 2451 2452 { 2453 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2454 struct in6_ifaddr *ia; 2455 int s = pserialize_read_enter(); 2456 if ((ia = in6ifa_ifpforlinklocal(ifp, 2457 IN6_IFF_NOTREADY| 2458 IN6_IFF_ANYCAST)) == NULL) { 2459 pserialize_read_exit(s); 2460 goto fail; 2461 } 2462 ifp_ll6 = &ia->ia_addr.sin6_addr; 2463 pserialize_read_exit(s); 2464 } 2465 2466 /* get ip6 linklocal address for the router. */ 2467 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2468 struct sockaddr_in6 *sin6; 2469 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2470 nexthop = &sin6->sin6_addr; 2471 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2472 nexthop = NULL; 2473 } else 2474 nexthop = NULL; 2475 2476 /* ip6 */ 2477 ip6 = mtod(m, struct ip6_hdr *); 2478 ip6->ip6_flow = 0; 2479 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2480 ip6->ip6_vfc |= IPV6_VERSION; 2481 /* ip6->ip6_plen will be set later */ 2482 ip6->ip6_nxt = IPPROTO_ICMPV6; 2483 ip6->ip6_hlim = 255; 2484 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2485 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2486 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2487 2488 /* ND Redirect */ 2489 nd_rd = (struct nd_redirect *)(ip6 + 1); 2490 nd_rd->nd_rd_type = ND_REDIRECT; 2491 nd_rd->nd_rd_code = 0; 2492 nd_rd->nd_rd_reserved = 0; 2493 if (rt->rt_flags & RTF_GATEWAY) { 2494 /* 2495 * nd_rd->nd_rd_target must be a link-local address in 2496 * better router cases. 2497 */ 2498 if (!nexthop) 2499 goto fail; 2500 bcopy(nexthop, &nd_rd->nd_rd_target, 2501 sizeof(nd_rd->nd_rd_target)); 2502 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2503 sizeof(nd_rd->nd_rd_dst)); 2504 } else { 2505 /* make sure redtgt == reddst */ 2506 nexthop = &sip6->ip6_dst; 2507 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2508 sizeof(nd_rd->nd_rd_target)); 2509 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2510 sizeof(nd_rd->nd_rd_dst)); 2511 } 2512 2513 p = (u_char *)(nd_rd + 1); 2514 2515 { 2516 /* target lladdr option */ 2517 struct llentry *ln = NULL; 2518 int len; 2519 struct nd_opt_hdr *nd_opt; 2520 char *lladdr; 2521 2522 ln = nd6_lookup(nexthop, ifp, false); 2523 if (ln == NULL) 2524 goto nolladdropt; 2525 len = sizeof(*nd_opt) + ifp->if_addrlen; 2526 len = (len + 7) & ~7; /* round by 8 */ 2527 /* safety check */ 2528 if (len + (p - (u_char *)ip6) > maxlen) { 2529 LLE_RUNLOCK(ln); 2530 goto nolladdropt; 2531 } 2532 if (ln->la_flags & LLE_VALID) { 2533 nd_opt = (struct nd_opt_hdr *)p; 2534 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2535 nd_opt->nd_opt_len = len >> 3; 2536 lladdr = (char *)(nd_opt + 1); 2537 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2538 p += len; 2539 } 2540 LLE_RUNLOCK(ln); 2541 } 2542 nolladdropt:; 2543 2544 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2545 2546 /* just to be safe */ 2547 if (m0->m_flags & M_DECRYPTED) 2548 goto noredhdropt; 2549 if (p - (u_char *)ip6 > maxlen) 2550 goto noredhdropt; 2551 2552 { 2553 /* redirected header option */ 2554 int len; 2555 struct nd_opt_rd_hdr *nd_opt_rh; 2556 2557 /* 2558 * compute the maximum size for icmp6 redirect header option. 2559 * XXX room for auth header? 2560 */ 2561 len = maxlen - (p - (u_char *)ip6); 2562 len &= ~7; 2563 2564 /* 2565 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2566 * about padding/truncate rule for the original IP packet. 2567 * From the discussion on IPv6imp in Feb 1999, 2568 * the consensus was: 2569 * - "attach as much as possible" is the goal 2570 * - pad if not aligned (original size can be guessed by 2571 * original ip6 header) 2572 * Following code adds the padding if it is simple enough, 2573 * and truncates if not. 2574 */ 2575 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2576 /* not enough room, truncate */ 2577 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2578 m0->m_pkthdr.len); 2579 } else { 2580 /* 2581 * enough room, truncate if not aligned. 2582 * we don't pad here for simplicity. 2583 */ 2584 size_t extra; 2585 2586 extra = m0->m_pkthdr.len % 8; 2587 if (extra) { 2588 /* truncate */ 2589 m_adj(m0, -extra); 2590 } 2591 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2592 } 2593 2594 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2595 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2596 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2597 nd_opt_rh->nd_opt_rh_len = len >> 3; 2598 p += sizeof(*nd_opt_rh); 2599 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2600 2601 /* connect m0 to m */ 2602 m->m_pkthdr.len += m0->m_pkthdr.len; 2603 m_cat(m, m0); 2604 m0 = NULL; 2605 } 2606 noredhdropt: 2607 if (m0) { 2608 m_freem(m0); 2609 m0 = NULL; 2610 } 2611 2612 /* XXX: clear embedded link IDs in the inner header */ 2613 in6_clearscope(&sip6->ip6_src); 2614 in6_clearscope(&sip6->ip6_dst); 2615 in6_clearscope(&nd_rd->nd_rd_target); 2616 in6_clearscope(&nd_rd->nd_rd_dst); 2617 2618 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2619 2620 nd_rd->nd_rd_cksum = 0; 2621 nd_rd->nd_rd_cksum 2622 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2623 2624 /* send the packet to outside... */ 2625 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2626 icmp6_ifstat_inc(ifp, ifs6_out_error); 2627 2628 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2629 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2630 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2631 2632 return; 2633 2634 fail: 2635 if (m) 2636 m_freem(m); 2637 if (m0) 2638 m_freem(m0); 2639 } 2640 2641 /* 2642 * ICMPv6 socket option processing. 2643 */ 2644 int 2645 icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2646 { 2647 int error = 0; 2648 struct in6pcb *in6p = sotoin6pcb(so); 2649 2650 if (sopt->sopt_level != IPPROTO_ICMPV6) 2651 return rip6_ctloutput(op, so, sopt); 2652 2653 switch (op) { 2654 case PRCO_SETOPT: 2655 switch (sopt->sopt_name) { 2656 case ICMP6_FILTER: 2657 { 2658 struct icmp6_filter fil; 2659 2660 error = sockopt_get(sopt, &fil, sizeof(fil)); 2661 if (error) 2662 break; 2663 memcpy(in6p->in6p_icmp6filt, &fil, 2664 sizeof(struct icmp6_filter)); 2665 error = 0; 2666 break; 2667 } 2668 2669 default: 2670 error = ENOPROTOOPT; 2671 break; 2672 } 2673 break; 2674 2675 case PRCO_GETOPT: 2676 switch (sopt->sopt_name) { 2677 case ICMP6_FILTER: 2678 { 2679 if (in6p->in6p_icmp6filt == NULL) { 2680 error = EINVAL; 2681 break; 2682 } 2683 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2684 sizeof(struct icmp6_filter)); 2685 break; 2686 } 2687 2688 default: 2689 error = ENOPROTOOPT; 2690 break; 2691 } 2692 break; 2693 } 2694 2695 return (error); 2696 } 2697 2698 /* 2699 * Perform rate limit check. 2700 * Returns 0 if it is okay to send the icmp6 packet. 2701 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2702 * limitation. 2703 * 2704 * XXX per-destination/type check necessary? 2705 */ 2706 static int 2707 icmp6_ratelimit( 2708 const struct in6_addr *dst, /* not used at this moment */ 2709 const int type, /* not used at this moment */ 2710 const int code) /* not used at this moment */ 2711 { 2712 int ret; 2713 2714 ret = 0; /* okay to send */ 2715 2716 /* PPS limit */ 2717 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2718 icmp6errppslim)) { 2719 /* The packet is subject to rate limit */ 2720 ret++; 2721 } 2722 2723 return ret; 2724 } 2725 2726 static struct rtentry * 2727 icmp6_mtudisc_clone(struct sockaddr *dst) 2728 { 2729 struct rtentry *rt; 2730 int error; 2731 2732 rt = rtalloc1(dst, 1); 2733 if (rt == 0) 2734 return NULL; 2735 2736 /* If we didn't get a host route, allocate one */ 2737 if ((rt->rt_flags & RTF_HOST) == 0) { 2738 struct rtentry *nrt; 2739 2740 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2741 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2742 if (error) { 2743 rtfree(rt); 2744 return NULL; 2745 } 2746 nrt->rt_rmx = rt->rt_rmx; 2747 rtfree(rt); 2748 rt = nrt; 2749 } 2750 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2751 icmp6_mtudisc_timeout_q); 2752 if (error) { 2753 rtfree(rt); 2754 return NULL; 2755 } 2756 2757 return rt; /* caller need to call rtfree() */ 2758 } 2759 2760 static void 2761 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2762 { 2763 2764 KASSERT(rt != NULL); 2765 rt_assert_referenced(rt); 2766 2767 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2768 (RTF_DYNAMIC | RTF_HOST)) { 2769 rtrequest(RTM_DELETE, rt_getkey(rt), 2770 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2771 } else { 2772 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2773 rt->rt_rmx.rmx_mtu = 0; 2774 } 2775 } 2776 2777 static void 2778 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2779 { 2780 2781 KASSERT(rt != NULL); 2782 rt_assert_referenced(rt); 2783 2784 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2785 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2786 rtrequest(RTM_DELETE, rt_getkey(rt), 2787 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2788 } 2789 } 2790 2791 /* 2792 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2793 */ 2794 static int 2795 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2796 { 2797 (void)&name; 2798 (void)&l; 2799 (void)&oname; 2800 2801 if (namelen != 0) 2802 return (EINVAL); 2803 2804 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2805 /*XXXUNCONST*/ 2806 __UNCONST(newp), newlen)); 2807 } 2808 2809 static int 2810 sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2811 { 2812 2813 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2814 } 2815 2816 static int 2817 sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2818 { 2819 int error, tmp; 2820 struct sysctlnode node; 2821 2822 node = *rnode; 2823 node.sysctl_data = &tmp; 2824 tmp = icmp6_redirtimeout; 2825 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2826 if (error || newp == NULL) 2827 return error; 2828 if (tmp < 0) 2829 return EINVAL; 2830 icmp6_redirtimeout = tmp; 2831 2832 if (icmp6_redirect_timeout_q != NULL) { 2833 if (icmp6_redirtimeout == 0) { 2834 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2835 } else { 2836 rt_timer_queue_change(icmp6_redirect_timeout_q, 2837 icmp6_redirtimeout); 2838 } 2839 } else if (icmp6_redirtimeout > 0) { 2840 icmp6_redirect_timeout_q = 2841 rt_timer_queue_create(icmp6_redirtimeout); 2842 } 2843 2844 return 0; 2845 } 2846 2847 static void 2848 sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2849 { 2850 extern int nd6_maxqueuelen; /* defined in nd6.c */ 2851 2852 sysctl_createv(clog, 0, NULL, NULL, 2853 CTLFLAG_PERMANENT, 2854 CTLTYPE_NODE, "inet6", NULL, 2855 NULL, 0, NULL, 0, 2856 CTL_NET, PF_INET6, CTL_EOL); 2857 sysctl_createv(clog, 0, NULL, NULL, 2858 CTLFLAG_PERMANENT, 2859 CTLTYPE_NODE, "icmp6", 2860 SYSCTL_DESCR("ICMPv6 related settings"), 2861 NULL, 0, NULL, 0, 2862 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2863 2864 sysctl_createv(clog, 0, NULL, NULL, 2865 CTLFLAG_PERMANENT, 2866 CTLTYPE_STRUCT, "stats", 2867 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2868 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2869 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2870 ICMPV6CTL_STATS, CTL_EOL); 2871 sysctl_createv(clog, 0, NULL, NULL, 2872 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2873 CTLTYPE_INT, "rediraccept", 2874 SYSCTL_DESCR("Accept and process redirect messages"), 2875 NULL, 0, &icmp6_rediraccept, 0, 2876 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2877 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2878 sysctl_createv(clog, 0, NULL, NULL, 2879 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2880 CTLTYPE_INT, "redirtimeout", 2881 SYSCTL_DESCR("Redirect generated route lifetime"), 2882 sysctl_net_inet6_icmp6_redirtimeout, 0, 2883 &icmp6_redirtimeout, 0, 2884 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2885 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2886 #if 0 /* obsoleted */ 2887 sysctl_createv(clog, 0, NULL, NULL, 2888 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2889 CTLTYPE_INT, "errratelimit", NULL, 2890 NULL, 0, &icmp6_errratelimit, 0, 2891 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2892 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2893 #endif 2894 sysctl_createv(clog, 0, NULL, NULL, 2895 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2896 CTLTYPE_INT, "nd6_prune", 2897 SYSCTL_DESCR("Neighbor discovery prune interval"), 2898 NULL, 0, &nd6_prune, 0, 2899 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2900 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2901 sysctl_createv(clog, 0, NULL, NULL, 2902 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2903 CTLTYPE_INT, "nd6_delay", 2904 SYSCTL_DESCR("First probe delay time"), 2905 NULL, 0, &nd6_delay, 0, 2906 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2907 ICMPV6CTL_ND6_DELAY, CTL_EOL); 2908 sysctl_createv(clog, 0, NULL, NULL, 2909 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2910 CTLTYPE_INT, "nd6_umaxtries", 2911 SYSCTL_DESCR("Number of unicast discovery attempts"), 2912 NULL, 0, &nd6_umaxtries, 0, 2913 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2914 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 2915 sysctl_createv(clog, 0, NULL, NULL, 2916 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2917 CTLTYPE_INT, "nd6_mmaxtries", 2918 SYSCTL_DESCR("Number of multicast discovery attempts"), 2919 NULL, 0, &nd6_mmaxtries, 0, 2920 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2921 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 2922 sysctl_createv(clog, 0, NULL, NULL, 2923 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2924 CTLTYPE_INT, "nd6_useloopback", 2925 SYSCTL_DESCR("Use loopback interface for local traffic"), 2926 NULL, 0, &nd6_useloopback, 0, 2927 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2928 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 2929 #if 0 /* obsoleted */ 2930 sysctl_createv(clog, 0, NULL, NULL, 2931 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2932 CTLTYPE_INT, "nd6_proxyall", NULL, 2933 NULL, 0, &nd6_proxyall, 0, 2934 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2935 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 2936 #endif 2937 sysctl_createv(clog, 0, NULL, NULL, 2938 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2939 CTLTYPE_INT, "nodeinfo", 2940 SYSCTL_DESCR("Respond to node information requests"), 2941 NULL, 0, &icmp6_nodeinfo, 0, 2942 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2943 ICMPV6CTL_NODEINFO, CTL_EOL); 2944 sysctl_createv(clog, 0, NULL, NULL, 2945 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2946 CTLTYPE_INT, "errppslimit", 2947 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 2948 NULL, 0, &icmp6errppslim, 0, 2949 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2950 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 2951 sysctl_createv(clog, 0, NULL, NULL, 2952 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2953 CTLTYPE_INT, "nd6_maxnudhint", 2954 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 2955 NULL, 0, &nd6_maxnudhint, 0, 2956 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2957 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 2958 sysctl_createv(clog, 0, NULL, NULL, 2959 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2960 CTLTYPE_INT, "mtudisc_hiwat", 2961 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2962 NULL, 0, &icmp6_mtudisc_hiwat, 0, 2963 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2964 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 2965 sysctl_createv(clog, 0, NULL, NULL, 2966 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2967 CTLTYPE_INT, "mtudisc_lowat", 2968 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2969 NULL, 0, &icmp6_mtudisc_lowat, 0, 2970 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2971 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 2972 sysctl_createv(clog, 0, NULL, NULL, 2973 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2974 CTLTYPE_INT, "nd6_debug", 2975 SYSCTL_DESCR("Enable neighbor discovery debug output"), 2976 NULL, 0, &nd6_debug, 0, 2977 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2978 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 2979 sysctl_createv(clog, 0, NULL, NULL, 2980 CTLFLAG_PERMANENT, 2981 CTLTYPE_STRUCT, "nd6_drlist", 2982 SYSCTL_DESCR("Default router list"), 2983 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 2984 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2985 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 2986 sysctl_createv(clog, 0, NULL, NULL, 2987 CTLFLAG_PERMANENT, 2988 CTLTYPE_STRUCT, "nd6_prlist", 2989 SYSCTL_DESCR("Prefix list"), 2990 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 2991 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2992 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 2993 sysctl_createv(clog, 0, NULL, NULL, 2994 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2995 CTLTYPE_INT, "maxqueuelen", 2996 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 2997 NULL, 1, &nd6_maxqueuelen, 0, 2998 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2999 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3000 } 3001 3002 void 3003 icmp6_statinc(u_int stat) 3004 { 3005 3006 KASSERT(stat < ICMP6_NSTATS); 3007 ICMP6_STATINC(stat); 3008 } 3009