icmp6.c revision 1.234
1/* $NetBSD: icmp6.c,v 1.234 2018/04/28 13:26:57 maxv 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 1.234 2018/04/28 13:26:57 maxv 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 <netinet/wqinput.h> 94#include <netinet6/ip6_var.h> 95#include <netinet6/ip6_private.h> 96#include <netinet/icmp6.h> 97#include <netinet6/icmp6_private.h> 98#include <netinet6/mld6_var.h> 99#include <netinet6/in6_pcb.h> 100#include <netinet6/nd6.h> 101#include <netinet6/in6_ifattach.h> 102#include <netinet6/ip6protosw.h> 103#include <netinet6/scope6_var.h> 104 105#ifdef IPSEC 106#include <netipsec/ipsec.h> 107#include <netipsec/ipsec6.h> 108#include <netipsec/key.h> 109#endif 110 111#include "faith.h" 112#if defined(NFAITH) && 0 < NFAITH 113#include <net/if_faith.h> 114#endif 115 116#include <net/net_osdep.h> 117 118extern struct domain inet6domain; 119 120percpu_t *icmp6stat_percpu; 121 122extern struct inpcbtable raw6cbtable; 123extern int icmp6errppslim; 124static int icmp6errpps_count = 0; 125static struct timeval icmp6errppslim_last; 126extern int icmp6_nodeinfo; 127 128/* 129 * List of callbacks to notify when Path MTU changes are made. 130 */ 131struct icmp6_mtudisc_callback { 132 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 133 void (*mc_func)(struct in6_addr *); 134}; 135 136LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 137 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 138 139static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 140extern int pmtu_expire; 141 142/* XXX do these values make any sense? */ 143static int icmp6_mtudisc_hiwat = 1280; 144static int icmp6_mtudisc_lowat = 256; 145 146/* 147 * keep track of # of redirect routes. 148 */ 149static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 150 151/* XXX experimental, turned off */ 152static int icmp6_redirect_hiwat = -1; 153static int icmp6_redirect_lowat = -1; 154 155/* Protect mtudisc and redirect stuffs */ 156static kmutex_t icmp6_mtx __cacheline_aligned; 157 158static void icmp6_errcount(u_int, int, int); 159static int icmp6_rip6_input(struct mbuf **, int); 160static void icmp6_reflect(struct mbuf *, size_t); 161static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 162static const char *icmp6_redirect_diag(char *, size_t, struct in6_addr *, 163 struct in6_addr *, struct in6_addr *); 164static void icmp6_redirect_input(struct mbuf *, int); 165static struct mbuf *ni6_input(struct mbuf *, int); 166static struct mbuf *ni6_nametodns(const char *, int, int); 167static int ni6_dnsmatch(const char *, int, const char *, int); 168static int ni6_addrs(struct icmp6_nodeinfo *, struct ifnet **, char *, 169 struct psref *); 170static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 171 struct ifnet *, int); 172static int icmp6_notify_error(struct mbuf *, int, int, int); 173static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 174static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 175static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 176static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 177 178/* workqueue-based pr_input */ 179static struct wqinput *icmp6_wqinput; 180static void _icmp6_input(struct mbuf *m, int off, int proto); 181 182void 183icmp6_init(void) 184{ 185 186 sysctl_net_inet6_icmp6_setup(NULL); 187 mld_init(); 188 189 mutex_init(&icmp6_mtx, MUTEX_DEFAULT, IPL_NONE); 190 mutex_enter(&icmp6_mtx); 191 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 192 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 193 mutex_exit(&icmp6_mtx); 194 195 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS); 196 197 icmp6_wqinput = wqinput_create("icmp6", _icmp6_input); 198} 199 200static void 201icmp6_errcount(u_int base, int type, int code) 202{ 203 switch (type) { 204 case ICMP6_DST_UNREACH: 205 switch (code) { 206 case ICMP6_DST_UNREACH_NOROUTE: 207 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE); 208 return; 209 case ICMP6_DST_UNREACH_ADMIN: 210 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN); 211 return; 212 case ICMP6_DST_UNREACH_BEYONDSCOPE: 213 ICMP6_STATINC(base + 214 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE); 215 return; 216 case ICMP6_DST_UNREACH_ADDR: 217 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR); 218 return; 219 case ICMP6_DST_UNREACH_NOPORT: 220 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT); 221 return; 222 } 223 break; 224 case ICMP6_PACKET_TOO_BIG: 225 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG); 226 return; 227 case ICMP6_TIME_EXCEEDED: 228 switch (code) { 229 case ICMP6_TIME_EXCEED_TRANSIT: 230 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT); 231 return; 232 case ICMP6_TIME_EXCEED_REASSEMBLY: 233 ICMP6_STATINC(base + 234 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY); 235 return; 236 } 237 break; 238 case ICMP6_PARAM_PROB: 239 switch (code) { 240 case ICMP6_PARAMPROB_HEADER: 241 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER); 242 return; 243 case ICMP6_PARAMPROB_NEXTHEADER: 244 ICMP6_STATINC(base + 245 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER); 246 return; 247 case ICMP6_PARAMPROB_OPTION: 248 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION); 249 return; 250 } 251 break; 252 case ND_REDIRECT: 253 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT); 254 return; 255 } 256 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN); 257} 258 259/* 260 * Register a Path MTU Discovery callback. 261 */ 262void 263icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *)) 264{ 265 struct icmp6_mtudisc_callback *mc, *new; 266 267 new = kmem_alloc(sizeof(*mc), KM_SLEEP); 268 269 mutex_enter(&icmp6_mtx); 270 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 271 mc = LIST_NEXT(mc, mc_list)) { 272 if (mc->mc_func == func) { 273 mutex_exit(&icmp6_mtx); 274 kmem_free(new, sizeof(*mc)); 275 return; 276 } 277 } 278 279 new->mc_func = func; 280 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, new, mc_list); 281 mutex_exit(&icmp6_mtx); 282} 283 284/* 285 * A wrapper function for icmp6_error() necessary when the erroneous packet 286 * may not contain enough scope zone information. 287 */ 288void 289icmp6_error2(struct mbuf *m, int type, int code, int param, 290 struct ifnet *ifp) 291{ 292 struct ip6_hdr *ip6; 293 294 KASSERT(ifp != NULL); 295 296 if (m->m_len < sizeof(struct ip6_hdr)) { 297 m = m_pullup(m, sizeof(struct ip6_hdr)); 298 if (m == NULL) 299 return; 300 } 301 302 ip6 = mtod(m, struct ip6_hdr *); 303 304 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 305 goto out; 306 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 307 goto out; 308 309 icmp6_error(m, type, code, param); 310 return; 311 312out: 313 m_freem(m); 314} 315 316/* 317 * Generate an error packet of type error in response to bad IP6 packet. 318 */ 319void 320icmp6_error(struct mbuf *m, int type, int code, int param) 321{ 322 struct ip6_hdr *oip6, *nip6; 323 struct icmp6_hdr *icmp6; 324 u_int preplen; 325 int off; 326 int nxt; 327 328 ICMP6_STATINC(ICMP6_STAT_ERROR); 329 330 /* count per-type-code statistics */ 331 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); 332 333 if (m->m_flags & M_DECRYPTED) { 334 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 335 goto freeit; 336 } 337 338 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && 339 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) 340 return; 341 oip6 = mtod(m, struct ip6_hdr *); 342 343 /* 344 * If the destination address of the erroneous packet is a multicast 345 * address, or the packet was sent using link-layer multicast, 346 * we should basically suppress sending an error (RFC 2463, Section 347 * 2.4). 348 * We have two exceptions (the item e.2 in that section): 349 * - the Packet Too Big message can be sent for path MTU discovery. 350 * - the Parameter Problem Message that can be allowed an icmp6 error 351 * in the option type field. This check has been done in 352 * ip6_unknown_opt(), so we can just check the type and code. 353 */ 354 if ((m->m_flags & (M_BCAST|M_MCAST) || 355 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 356 (type != ICMP6_PACKET_TOO_BIG && 357 (type != ICMP6_PARAM_PROB || 358 code != ICMP6_PARAMPROB_OPTION))) 359 goto freeit; 360 361 /* 362 * RFC 2463, 2.4 (e.5): source address check. 363 * XXX: the case of anycast source? 364 */ 365 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 366 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 367 goto freeit; 368 369 /* 370 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 371 * don't do it. 372 */ 373 nxt = -1; 374 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 375 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 376 struct icmp6_hdr *icp; 377 378 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 379 sizeof(*icp)); 380 if (icp == NULL) { 381 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 382 return; 383 } 384 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 385 icp->icmp6_type == ND_REDIRECT) { 386 /* 387 * ICMPv6 error 388 * Special case: for redirect (which is 389 * informational) we must not send icmp6 error. 390 */ 391 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 392 goto freeit; 393 } else { 394 /* ICMPv6 informational - send the error */ 395 } 396 } else { 397 /* non-ICMPv6 - send the error */ 398 } 399 400 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 401 402 /* Finally, do rate limitation check. */ 403 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 404 ICMP6_STATINC(ICMP6_STAT_TOOFREQ); 405 goto freeit; 406 } 407 408 /* 409 * OK, ICMP6 can be generated. 410 */ 411 412 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 413 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 414 415 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 416 M_PREPEND(m, preplen, M_DONTWAIT); 417 if (m && M_UNWRITABLE(m, preplen)) 418 m = m_pullup(m, preplen); 419 if (m == NULL) { 420 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__); 421 return; 422 } 423 424 nip6 = mtod(m, struct ip6_hdr *); 425 nip6->ip6_src = oip6->ip6_src; 426 nip6->ip6_dst = oip6->ip6_dst; 427 428 in6_clearscope(&oip6->ip6_src); 429 in6_clearscope(&oip6->ip6_dst); 430 431 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 432 icmp6->icmp6_type = type; 433 icmp6->icmp6_code = code; 434 icmp6->icmp6_pptr = htonl((u_int32_t)param); 435 436 /* 437 * icmp6_reflect() is designed to be in the input path. 438 * icmp6_error() can be called from both input and output path, 439 * and if we are in output path rcvif could contain bogus value. 440 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 441 * information in ip header (nip6). 442 */ 443 m_reset_rcvif(m); 444 445 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 446 447 /* header order: IPv6 - ICMPv6 */ 448 icmp6_reflect(m, sizeof(struct ip6_hdr)); 449 450 return; 451 452freeit: 453 /* 454 * If we can't tell whether or not we can generate ICMP6, free it. 455 */ 456 m_freem(m); 457} 458 459/* 460 * Process a received ICMP6 message. 461 */ 462static void 463_icmp6_input(struct mbuf *m, int off, int proto) 464{ 465 struct mbuf *n; 466 struct ip6_hdr *ip6, *nip6; 467 struct icmp6_hdr *icmp6, *nicmp6; 468 int icmp6len = m->m_pkthdr.len - off; 469 int code, sum; 470 struct ifnet *rcvif; 471 struct psref psref; 472 char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN]; 473 474 rcvif = m_get_rcvif_psref(m, &psref); 475 if (__predict_false(rcvif == NULL)) 476 goto freeit; 477 478#define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 479 KASSERT(ICMP6_MAXLEN < MCLBYTES); 480 icmp6_ifstat_inc(rcvif, ifs6_in_msg); 481 482 /* 483 * Locate icmp6 structure in mbuf, and check 484 * that not corrupted and of at least minimum length 485 */ 486 487 if (icmp6len < sizeof(struct icmp6_hdr)) { 488 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 489 icmp6_ifstat_inc(rcvif, ifs6_in_error); 490 goto freeit; 491 } 492 493 if (m->m_len < sizeof(struct ip6_hdr)) { 494 m = m_pullup(m, sizeof(struct ip6_hdr)); 495 if (m == NULL) { 496 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 497 icmp6_ifstat_inc(rcvif, ifs6_in_error); 498 goto freeit; 499 } 500 } 501 502 ip6 = mtod(m, struct ip6_hdr *); 503 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 504 if (icmp6 == NULL) { 505 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 506 icmp6_ifstat_inc(rcvif, ifs6_in_error); 507 goto freeit; 508 } 509 510 /* 511 * Enforce alignment requirements that are violated in 512 * some cases, see kern/50766 for details. 513 */ 514 if (IP6_HDR_ALIGNED_P(icmp6) == 0) { 515 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0); 516 if (m == NULL) { 517 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 518 icmp6_ifstat_inc(rcvif, ifs6_in_error); 519 goto freeit; 520 } 521 ip6 = mtod(m, struct ip6_hdr *); 522 icmp6 = (struct icmp6_hdr *)(mtod(m, char *) + off); 523 } 524 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 525 526 /* 527 * calculate the checksum 528 */ 529 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 530 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 531 icmp6->icmp6_type, sum, IN6_PRINT(ip6buf, &ip6->ip6_src)); 532 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 533 icmp6_ifstat_inc(rcvif, ifs6_in_error); 534 goto freeit; 535 } 536 537#if defined(NFAITH) && 0 < NFAITH 538 if (faithprefix(&ip6->ip6_dst)) { 539 /* 540 * Deliver very specific ICMP6 type only. 541 * This is important to deliver TOOBIG. Otherwise PMTUD 542 * will not work. 543 */ 544 switch (icmp6->icmp6_type) { 545 case ICMP6_DST_UNREACH: 546 case ICMP6_PACKET_TOO_BIG: 547 case ICMP6_TIME_EXCEEDED: 548 break; 549 default: 550 goto freeit; 551 } 552 } 553#endif 554 555 code = icmp6->icmp6_code; 556 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 557 558 switch (icmp6->icmp6_type) { 559 case ICMP6_DST_UNREACH: 560 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 561 switch (code) { 562 case ICMP6_DST_UNREACH_NOROUTE: 563 code = PRC_UNREACH_NET; 564 break; 565 case ICMP6_DST_UNREACH_ADMIN: 566 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 567 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 568 break; 569 case ICMP6_DST_UNREACH_ADDR: 570 code = PRC_HOSTDEAD; 571 break; 572 case ICMP6_DST_UNREACH_BEYONDSCOPE: 573 /* I mean "source address was incorrect." */ 574 code = PRC_UNREACH_NET; 575 break; 576 case ICMP6_DST_UNREACH_NOPORT: 577 code = PRC_UNREACH_PORT; 578 break; 579 default: 580 goto badcode; 581 } 582 goto deliver; 583 584 case ICMP6_PACKET_TOO_BIG: 585 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 586 587 /* 588 * MTU is checked in icmp6_mtudisc. 589 */ 590 code = PRC_MSGSIZE; 591 592 /* 593 * Updating the path MTU will be done after examining 594 * intermediate extension headers. 595 */ 596 goto deliver; 597 598 case ICMP6_TIME_EXCEEDED: 599 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 600 switch (code) { 601 case ICMP6_TIME_EXCEED_TRANSIT: 602 code = PRC_TIMXCEED_INTRANS; 603 break; 604 case ICMP6_TIME_EXCEED_REASSEMBLY: 605 code = PRC_TIMXCEED_REASS; 606 break; 607 default: 608 goto badcode; 609 } 610 goto deliver; 611 612 case ICMP6_PARAM_PROB: 613 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 614 switch (code) { 615 case ICMP6_PARAMPROB_NEXTHEADER: 616 code = PRC_UNREACH_PROTOCOL; 617 break; 618 case ICMP6_PARAMPROB_HEADER: 619 case ICMP6_PARAMPROB_OPTION: 620 code = PRC_PARAMPROB; 621 break; 622 default: 623 goto badcode; 624 } 625 goto deliver; 626 627 case ICMP6_ECHO_REQUEST: 628 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 629 if (code != 0) 630 goto badcode; 631 /* 632 * Copy mbuf to send to two data paths: userland socket(s), 633 * and to the querier (echo reply). 634 * m: a copy for socket, n: a copy for querier 635 * 636 * If the first mbuf is shared, or the first mbuf is too short, 637 * copy the first part of the data into a fresh mbuf. 638 * Otherwise, we will wrongly overwrite both copies. 639 */ 640 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 641 /* Give up local */ 642 n = m; 643 m = NULL; 644 } else if (M_UNWRITABLE(n, off + sizeof(struct icmp6_hdr))) { 645 struct mbuf *n0 = n; 646 647 /* 648 * Prepare an internal mbuf. m_pullup() doesn't 649 * always copy the length we specified. 650 */ 651 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 652 /* Give up local */ 653 n = m; 654 m = NULL; 655 } 656 m_freem(n0); 657 } 658 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 659 sizeof(*nicmp6)); 660 if (nicmp6 == NULL) 661 goto freeit; 662 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 663 nicmp6->icmp6_code = 0; 664 if (n) { 665 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 666 icmp6s[ICMP6_STAT_REFLECT]++; 667 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 668 ICMP6_STAT_PUTREF(); 669 icmp6_reflect(n, off); 670 } 671 if (!m) 672 goto freeit; 673 break; 674 675 case ICMP6_ECHO_REPLY: 676 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 677 if (code != 0) 678 goto badcode; 679 break; 680 681 case MLD_LISTENER_QUERY: 682 case MLD_LISTENER_REPORT: 683 if (icmp6len < sizeof(struct mld_hdr)) 684 goto badlen; 685 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 686 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 687 else 688 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 689 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 690 /* give up local */ 691 mld_input(m, off); 692 m = NULL; 693 goto freeit; 694 } 695 mld_input(n, off); 696 /* m stays. */ 697 break; 698 699 case MLD_LISTENER_DONE: 700 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 701 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 702 goto badlen; 703 break; /* nothing to be done in kernel */ 704 705 case MLD_MTRACE_RESP: 706 case MLD_MTRACE: 707 /* XXX: these two are experimental. not officially defined. */ 708 /* XXX: per-interface statistics? */ 709 break; /* just pass it to applications */ 710 711 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 712 { 713 enum { WRU, FQDN } mode; 714 715 if (!icmp6_nodeinfo) 716 break; 717 718 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 719 mode = WRU; 720 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 721 mode = FQDN; 722 else 723 goto badlen; 724 725 if (mode == FQDN) { 726 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 727 if (n) 728 n = ni6_input(n, off); 729 } else { 730 u_char *p; 731 int maxhlen; 732 733 if ((icmp6_nodeinfo & 5) != 5) 734 break; 735 736 if (code != 0) 737 goto badcode; 738 MGETHDR(n, M_DONTWAIT, m->m_type); 739 if (n && ICMP6_MAXLEN > MHLEN) { 740 MCLGET(n, M_DONTWAIT); 741 if ((n->m_flags & M_EXT) == 0) { 742 m_free(n); 743 n = NULL; 744 } 745 } 746 if (n == NULL) { 747 /* Give up remote */ 748 break; 749 } 750 m_reset_rcvif(n); 751 n->m_len = 0; 752 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 753 if (maxhlen < 0) { 754 m_free(n); 755 break; 756 } 757 if (maxhlen > hostnamelen) 758 maxhlen = hostnamelen; 759 /* 760 * Copy IPv6 and ICMPv6 only. 761 */ 762 nip6 = mtod(n, struct ip6_hdr *); 763 memcpy(nip6, ip6, sizeof(struct ip6_hdr)); 764 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 765 memcpy(nicmp6, icmp6, sizeof(struct icmp6_hdr)); 766 767 p = (u_char *)(nicmp6 + 1); 768 memset(p, 0, 4); 769 memcpy(p + 4, hostname, maxhlen); /* meaningless TTL */ 770 771 M_COPY_PKTHDR(n, m); /* just for rcvif */ 772 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 773 sizeof(struct icmp6_hdr) + 4 + maxhlen; 774 nicmp6->icmp6_type = ICMP6_WRUREPLY; 775 nicmp6->icmp6_code = 0; 776 } 777 if (n) { 778 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 779 icmp6s[ICMP6_STAT_REFLECT]++; 780 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 781 ICMP6_STAT_PUTREF(); 782 icmp6_reflect(n, sizeof(struct ip6_hdr)); 783 } 784 break; 785 } 786 787 case ICMP6_WRUREPLY: 788 if (code != 0) 789 goto badcode; 790 break; 791 792 case ND_ROUTER_SOLICIT: 793 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 794 if (code != 0) 795 goto badcode; 796 if (icmp6len < sizeof(struct nd_router_solicit)) 797 goto badlen; 798 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 799 /* give up local */ 800 nd6_rs_input(m, off, icmp6len); 801 m = NULL; 802 goto freeit; 803 } 804 nd6_rs_input(n, off, icmp6len); 805 /* m stays. */ 806 break; 807 808 case ND_ROUTER_ADVERT: 809 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 810 if (code != 0) 811 goto badcode; 812 if (icmp6len < sizeof(struct nd_router_advert)) 813 goto badlen; 814 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 815 /* give up local */ 816 nd6_ra_input(m, off, icmp6len); 817 m = NULL; 818 goto freeit; 819 } 820 nd6_ra_input(n, off, icmp6len); 821 /* m stays. */ 822 break; 823 824 case ND_NEIGHBOR_SOLICIT: 825 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 826 if (code != 0) 827 goto badcode; 828 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 829 goto badlen; 830 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 831 /* give up local */ 832 nd6_ns_input(m, off, icmp6len); 833 m = NULL; 834 goto freeit; 835 } 836 nd6_ns_input(n, off, icmp6len); 837 /* m stays. */ 838 break; 839 840 case ND_NEIGHBOR_ADVERT: 841 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 842 if (code != 0) 843 goto badcode; 844 if (icmp6len < sizeof(struct nd_neighbor_advert)) 845 goto badlen; 846 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 847 /* give up local */ 848 nd6_na_input(m, off, icmp6len); 849 m = NULL; 850 goto freeit; 851 } 852 nd6_na_input(n, off, icmp6len); 853 /* m stays. */ 854 break; 855 856 case ND_REDIRECT: 857 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 858 if (code != 0) 859 goto badcode; 860 if (icmp6len < sizeof(struct nd_redirect)) 861 goto badlen; 862 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 863 /* give up local */ 864 icmp6_redirect_input(m, off); 865 m = NULL; 866 goto freeit; 867 } 868 icmp6_redirect_input(n, off); 869 /* m stays. */ 870 break; 871 872 case ICMP6_ROUTER_RENUMBERING: 873 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 874 code != ICMP6_ROUTER_RENUMBERING_RESULT) 875 goto badcode; 876 if (icmp6len < sizeof(struct icmp6_router_renum)) 877 goto badlen; 878 break; 879 880 default: 881 nd6log(LOG_DEBUG, 882 "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 883 icmp6->icmp6_type, 884 IN6_PRINT(ip6buf, &ip6->ip6_src), 885 IN6_PRINT(ip6buf2, &ip6->ip6_dst), 886 rcvif ? rcvif->if_index : 0); 887 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 888 /* ICMPv6 error: MUST deliver it by spec... */ 889 code = PRC_NCMDS; 890 /* deliver */ 891 } else { 892 /* ICMPv6 informational: MUST not deliver */ 893 break; 894 } 895 deliver: 896 if (icmp6_notify_error(m, off, icmp6len, code)) { 897 /* In this case, m should've been freed. */ 898 m_put_rcvif_psref(rcvif, &psref); 899 return; 900 } 901 break; 902 903 badcode: 904 ICMP6_STATINC(ICMP6_STAT_BADCODE); 905 break; 906 907 badlen: 908 ICMP6_STATINC(ICMP6_STAT_BADLEN); 909 break; 910 } 911 m_put_rcvif_psref(rcvif, &psref); 912 913 /* deliver the packet to appropriate sockets */ 914 icmp6_rip6_input(&m, off); 915 916 return; 917 918freeit: 919 m_put_rcvif_psref(rcvif, &psref); 920 m_freem(m); 921 return; 922} 923 924int 925icmp6_input(struct mbuf **mp, int *offp, int proto) 926{ 927 928 wqinput_input(icmp6_wqinput, *mp, *offp, proto); 929 930 return IPPROTO_DONE; 931} 932 933static int 934icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 935{ 936 struct icmp6_hdr *icmp6; 937 struct ip6_hdr *eip6; 938 u_int32_t notifymtu; 939 struct sockaddr_in6 icmp6src, icmp6dst; 940 941 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 942 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 943 goto freeit; 944 } 945 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 946 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 947 if (icmp6 == NULL) { 948 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 949 return (-1); 950 } 951 eip6 = (struct ip6_hdr *)(icmp6 + 1); 952 953 /* Detect the upper level protocol */ 954 { 955 void (*ctlfunc)(int, struct sockaddr *, void *); 956 u_int8_t nxt = eip6->ip6_nxt; 957 int eoff = off + sizeof(struct icmp6_hdr) + 958 sizeof(struct ip6_hdr); 959 struct ip6ctlparam ip6cp; 960 struct in6_addr *finaldst = NULL; 961 int icmp6type = icmp6->icmp6_type; 962 struct ip6_frag *fh; 963 struct ip6_rthdr *rth; 964 struct ifnet *rcvif; 965 int s; 966 967 while (1) { /* XXX: should avoid infinite loop explicitly? */ 968 struct ip6_ext *eh; 969 970 switch (nxt) { 971 case IPPROTO_HOPOPTS: 972 case IPPROTO_DSTOPTS: 973 case IPPROTO_AH: 974 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 975 eoff, sizeof(*eh)); 976 if (eh == NULL) { 977 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 978 return (-1); 979 } 980 981 if (nxt == IPPROTO_AH) 982 eoff += (eh->ip6e_len + 2) << 2; 983 else 984 eoff += (eh->ip6e_len + 1) << 3; 985 nxt = eh->ip6e_nxt; 986 break; 987 case IPPROTO_ROUTING: 988 /* Ignore the option. */ 989 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 990 eoff, sizeof(*rth)); 991 if (rth == NULL) { 992 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 993 return (-1); 994 } 995 996 eoff += (rth->ip6r_len + 1) << 3; 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 if (__predict_false(rcvif == NULL)) 1050 goto freeit; 1051 sockaddr_in6_init(&icmp6dst, 1052 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1053 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1054 m_put_rcvif(rcvif, &s); 1055 goto freeit; 1056 } 1057 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1058 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1059 m_put_rcvif(rcvif, &s); 1060 goto freeit; 1061 } 1062 m_put_rcvif(rcvif, &s); 1063 1064 icmp6src.sin6_flowinfo = 1065 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1066 1067 if (finaldst == NULL) 1068 finaldst = &eip6->ip6_dst; 1069 ip6cp.ip6c_m = m; 1070 ip6cp.ip6c_icmp6 = icmp6; 1071 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1072 ip6cp.ip6c_off = eoff; 1073 ip6cp.ip6c_finaldst = finaldst; 1074 ip6cp.ip6c_src = &icmp6src; 1075 ip6cp.ip6c_nxt = nxt; 1076 1077 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1078 notifymtu = ntohl(icmp6->icmp6_mtu); 1079 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1080 } 1081 1082 ctlfunc = (void (*)(int, struct sockaddr *, void *)) 1083 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1084 if (ctlfunc) { 1085 (void)(*ctlfunc)(code, sin6tosa(&icmp6dst), &ip6cp); 1086 } 1087 } 1088 return (0); 1089 1090freeit: 1091 m_freem(m); 1092 return (-1); 1093} 1094 1095void 1096icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1097{ 1098 unsigned long rtcount; 1099 struct icmp6_mtudisc_callback *mc; 1100 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1101 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1102 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1103 u_int mtu = ntohl(icmp6->icmp6_mtu); 1104 struct rtentry *rt = NULL; 1105 struct sockaddr_in6 sin6; 1106 struct ifnet *rcvif; 1107 int s; 1108 1109 /* 1110 * The MTU should not be less than the minimal IPv6 MTU except for the 1111 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1112 * In that one case, the MTU might be less than 1280. 1113 */ 1114 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1115 /* is the mtu even sane? */ 1116 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1117 return; 1118 if (!validated) 1119 return; 1120 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1121 } 1122 1123 /* 1124 * allow non-validated cases if memory is plenty, to make traffic 1125 * from non-connected pcb happy. 1126 */ 1127 mutex_enter(&icmp6_mtx); 1128 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1129 if (validated) { 1130 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) { 1131 mutex_exit(&icmp6_mtx); 1132 return; 1133 } else if (0 <= icmp6_mtudisc_lowat && 1134 rtcount > icmp6_mtudisc_lowat) { 1135 /* 1136 * XXX nuke a victim, install the new one. 1137 */ 1138 } 1139 } else { 1140 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) { 1141 mutex_exit(&icmp6_mtx); 1142 return; 1143 } 1144 } 1145 mutex_exit(&icmp6_mtx); 1146 1147 memset(&sin6, 0, sizeof(sin6)); 1148 sin6.sin6_family = PF_INET6; 1149 sin6.sin6_len = sizeof(struct sockaddr_in6); 1150 sin6.sin6_addr = *dst; 1151 rcvif = m_get_rcvif(m, &s); 1152 if (__predict_false(rcvif == NULL)) 1153 return; 1154 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1155 m_put_rcvif(rcvif, &s); 1156 return; 1157 } 1158 m_put_rcvif(rcvif, &s); 1159 1160 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1161 1162 if (rt && (rt->rt_flags & RTF_HOST) && 1163 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1164 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1165 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1166 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1167 rt->rt_rmx.rmx_mtu = mtu; 1168 } 1169 } 1170 if (rt) { 1171 rt_unref(rt); 1172 } 1173 1174 /* 1175 * Notify protocols that the MTU for this destination 1176 * has changed. 1177 */ 1178 mutex_enter(&icmp6_mtx); 1179 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1180 mc = LIST_NEXT(mc, mc_list)) 1181 (*mc->mc_func)(&sin6.sin6_addr); 1182 mutex_exit(&icmp6_mtx); 1183} 1184 1185/* 1186 * Process a Node Information Query packet, based on 1187 * draft-ietf-ipngwg-icmp-name-lookups-07. 1188 * 1189 * Spec incompatibilities: 1190 * - IPv6 Subject address handling 1191 * - IPv4 Subject address handling support missing 1192 * - Proxy reply (answer even if it's not for me) 1193 * - joins NI group address at in6_ifattach() time only, does not cope 1194 * with hostname changes by sethostname(3) 1195 */ 1196static struct mbuf * 1197ni6_input(struct mbuf *m, int off) 1198{ 1199 struct icmp6_nodeinfo *ni6, *nni6; 1200 struct mbuf *n = NULL; 1201 u_int16_t qtype; 1202 int subjlen; 1203 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1204 struct ni_reply_fqdn *fqdn; 1205 int addrs; /* for NI_QTYPE_NODEADDR */ 1206 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1207 struct sockaddr_in6 sin6; /* ip6_dst */ 1208 struct in6_addr in6_subj; /* subject address */ 1209 struct ip6_hdr *ip6; 1210 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1211 char *subj = NULL; 1212 struct ifnet *rcvif; 1213 int s, ss; 1214 struct ifaddr *ifa; 1215 struct psref psref; 1216 1217 ip6 = mtod(m, struct ip6_hdr *); 1218 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1219 if (ni6 == NULL) { 1220 /* m is already reclaimed */ 1221 return NULL; 1222 } 1223 KASSERT((m->m_flags & M_PKTHDR) != 0); 1224 1225 /* 1226 * Validate IPv6 destination address. 1227 * 1228 * The Responder must discard the Query without further processing 1229 * unless it is one of the Responder's unicast or anycast addresses, or 1230 * a link-local scope multicast address which the Responder has joined. 1231 * [icmp-name-lookups-07, Section 4.] 1232 */ 1233 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1234 /* XXX scopeid */ 1235 ss = pserialize_read_enter(); 1236 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1237 if (ifa != NULL) { 1238 ; /* unicast/anycast, fine */ 1239 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) { 1240 ; /* link-local multicast, fine */ 1241 } else { 1242 pserialize_read_exit(ss); 1243 goto bad; 1244 } 1245 pserialize_read_exit(ss); 1246 1247 /* validate query Subject field. */ 1248 qtype = ntohs(ni6->ni_qtype); 1249 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1250 switch (qtype) { 1251 case NI_QTYPE_NOOP: 1252 case NI_QTYPE_SUPTYPES: 1253 /* 07 draft */ 1254 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1255 break; 1256 /* FALLTHROUGH */ 1257 case NI_QTYPE_FQDN: 1258 case NI_QTYPE_NODEADDR: 1259 case NI_QTYPE_IPV4ADDR: 1260 switch (ni6->ni_code) { 1261 case ICMP6_NI_SUBJ_IPV6: 1262#if ICMP6_NI_SUBJ_IPV6 != 0 1263 case 0: 1264#endif 1265 /* 1266 * backward compatibility - try to accept 03 draft 1267 * format, where no Subject is present. 1268 */ 1269 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1270 subjlen == 0) { 1271 oldfqdn++; 1272 break; 1273 } 1274#if ICMP6_NI_SUBJ_IPV6 != 0 1275 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1276 goto bad; 1277#endif 1278 1279 if (subjlen != sizeof(sin6.sin6_addr)) 1280 goto bad; 1281 1282 /* 1283 * Validate Subject address. 1284 * 1285 * Not sure what exactly "address belongs to the node" 1286 * means in the spec, is it just unicast, or what? 1287 * 1288 * At this moment we consider Subject address as 1289 * "belong to the node" if the Subject address equals 1290 * to the IPv6 destination address; validation for 1291 * IPv6 destination address should have done enough 1292 * check for us. 1293 * 1294 * We do not do proxy at this moment. 1295 */ 1296 /* m_pulldown instead of copy? */ 1297 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1298 subjlen, (void *)&in6_subj); 1299 rcvif = m_get_rcvif(m, &s); 1300 if (__predict_false(rcvif == NULL)) 1301 goto bad; 1302 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1303 m_put_rcvif(rcvif, &s); 1304 goto bad; 1305 } 1306 m_put_rcvif(rcvif, &s); 1307 1308 subj = (char *)&in6_subj; 1309 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1310 break; 1311 1312 /* 1313 * XXX if we are to allow other cases, we should really 1314 * be careful about scope here. 1315 * basically, we should disallow queries toward IPv6 1316 * destination X with subject Y, if scope(X) > scope(Y). 1317 * if we allow scope(X) > scope(Y), it will result in 1318 * information leakage across scope boundary. 1319 */ 1320 goto bad; 1321 1322 case ICMP6_NI_SUBJ_FQDN: 1323 /* 1324 * Validate Subject name with gethostname(3). 1325 * 1326 * The behavior may need some debate, since: 1327 * - we are not sure if the node has FQDN as 1328 * hostname (returned by gethostname(3)). 1329 * - the code does wildcard match for truncated names. 1330 * however, we are not sure if we want to perform 1331 * wildcard match, if gethostname(3) side has 1332 * truncated hostname. 1333 */ 1334 n = ni6_nametodns(hostname, hostnamelen, 0); 1335 if (!n || n->m_next || n->m_len == 0) 1336 goto bad; 1337 IP6_EXTHDR_GET(subj, char *, m, 1338 off + sizeof(struct icmp6_nodeinfo), subjlen); 1339 if (subj == NULL) 1340 goto bad; 1341 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1342 n->m_len)) { 1343 goto bad; 1344 } 1345 m_freem(n); 1346 n = NULL; 1347 break; 1348 1349 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1350 default: 1351 goto bad; 1352 } 1353 break; 1354 } 1355 1356 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1357 switch (qtype) { 1358 case NI_QTYPE_FQDN: 1359 if ((icmp6_nodeinfo & 1) == 0) 1360 goto bad; 1361 break; 1362 case NI_QTYPE_NODEADDR: 1363 case NI_QTYPE_IPV4ADDR: 1364 if ((icmp6_nodeinfo & 2) == 0) 1365 goto bad; 1366 break; 1367 } 1368 1369 /* guess reply length */ 1370 switch (qtype) { 1371 case NI_QTYPE_NOOP: 1372 break; /* no reply data */ 1373 case NI_QTYPE_SUPTYPES: 1374 replylen += sizeof(u_int32_t); 1375 break; 1376 case NI_QTYPE_FQDN: 1377 /* will append an mbuf */ 1378 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1379 break; 1380 case NI_QTYPE_NODEADDR: 1381 addrs = ni6_addrs(ni6, &ifp, subj, &psref); 1382 replylen += addrs * 1383 (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1384 if (replylen > MCLBYTES) 1385 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1386 break; 1387 case NI_QTYPE_IPV4ADDR: 1388 /* unsupported - should respond with unknown Qtype? */ 1389 goto bad; 1390 default: 1391 /* 1392 * XXX: We must return a reply with the ICMP6 code 1393 * `unknown Qtype' in this case. However we regard the case 1394 * as an FQDN query for backward compatibility. 1395 * Older versions set a random value to this field, 1396 * so it rarely varies in the defined qtypes. 1397 * But the mechanism is not reliable... 1398 * maybe we should obsolete older versions. 1399 */ 1400 qtype = NI_QTYPE_FQDN; 1401 /* will append an mbuf */ 1402 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1403 oldfqdn++; 1404 break; 1405 } 1406 1407 /* allocate an mbuf to reply. */ 1408 MGETHDR(n, M_DONTWAIT, m->m_type); 1409 if (n == NULL) { 1410 goto bad; 1411 } 1412 M_MOVE_PKTHDR(n, m); /* just for rcvif */ 1413 if (replylen > MHLEN) { 1414 if (replylen > MCLBYTES) { 1415 /* 1416 * XXX: should we try to allocate more? But MCLBYTES 1417 * is probably much larger than IPV6_MMTU... 1418 */ 1419 goto bad; 1420 } 1421 MCLGET(n, M_DONTWAIT); 1422 if ((n->m_flags & M_EXT) == 0) { 1423 goto bad; 1424 } 1425 } 1426 n->m_pkthdr.len = n->m_len = replylen; 1427 1428 /* copy mbuf header and IPv6 + Node Information base headers */ 1429 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1430 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1431 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1432 1433 /* qtype dependent procedure */ 1434 switch (qtype) { 1435 case NI_QTYPE_NOOP: 1436 nni6->ni_code = ICMP6_NI_SUCCESS; 1437 nni6->ni_flags = 0; 1438 break; 1439 case NI_QTYPE_SUPTYPES: 1440 { 1441 u_int32_t v; 1442 nni6->ni_code = ICMP6_NI_SUCCESS; 1443 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1444 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1445 v = (u_int32_t)htonl(0x0000000f); 1446 memcpy(nni6 + 1, &v, sizeof(u_int32_t)); 1447 break; 1448 } 1449 case NI_QTYPE_FQDN: 1450 nni6->ni_code = ICMP6_NI_SUCCESS; 1451 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1452 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 1453 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1454 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1455 /* 1456 * XXX do we really have FQDN in variable "hostname"? 1457 */ 1458 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1459 if (n->m_next == NULL) 1460 goto bad; 1461 /* XXX we assume that n->m_next is not a chain */ 1462 if (n->m_next->m_next != NULL) 1463 goto bad; 1464 n->m_pkthdr.len += n->m_next->m_len; 1465 break; 1466 case NI_QTYPE_NODEADDR: 1467 { 1468 int lenlim, copied; 1469 1470 nni6->ni_code = ICMP6_NI_SUCCESS; 1471 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1472 sizeof(struct icmp6_nodeinfo); 1473 lenlim = M_TRAILINGSPACE(n); 1474 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1475 if_put(ifp, &psref); 1476 ifp = NULL; 1477 /* update mbuf length */ 1478 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1479 sizeof(struct icmp6_nodeinfo) + copied; 1480 break; 1481 } 1482 default: 1483 panic("%s: impossible", __func__); 1484 break; 1485 } 1486 1487 nni6->ni_type = ICMP6_NI_REPLY; 1488 m_freem(m); 1489 return n; 1490 1491bad: 1492 if_put(ifp, &psref); 1493 m_freem(m); 1494 if (n) 1495 m_freem(n); 1496 return NULL; 1497} 1498 1499#define isupper(x) ('A' <= (x) && (x) <= 'Z') 1500#define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1501#define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1502#define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1503 1504/* 1505 * make a mbuf with DNS-encoded string. no compression support. 1506 * 1507 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1508 * treated as truncated name (two \0 at the end). this is a wild guess. 1509 * 1510 * old - return pascal string if non-zero 1511 */ 1512static struct mbuf * 1513ni6_nametodns(const char *name, int namelen, int old) 1514{ 1515 struct mbuf *m; 1516 char *cp, *ep; 1517 const char *p, *q; 1518 int i, len, nterm; 1519 1520 if (old) 1521 len = namelen + 1; 1522 else 1523 len = MCLBYTES; 1524 1525 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1526 MGET(m, M_DONTWAIT, MT_DATA); 1527 if (m && len > MLEN) { 1528 MCLGET(m, M_DONTWAIT); 1529 if ((m->m_flags & M_EXT) == 0) 1530 goto fail; 1531 } 1532 if (!m) 1533 goto fail; 1534 m->m_next = NULL; 1535 1536 if (old) { 1537 m->m_len = len; 1538 *mtod(m, char *) = namelen; 1539 memcpy(mtod(m, char *) + 1, name, namelen); 1540 return m; 1541 } else { 1542 m->m_len = 0; 1543 cp = mtod(m, char *); 1544 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1545 1546 /* if not certain about my name, return empty buffer */ 1547 if (namelen == 0) 1548 return m; 1549 1550 /* 1551 * guess if it looks like shortened hostname, or FQDN. 1552 * shortened hostname needs two trailing "\0". 1553 */ 1554 i = 0; 1555 for (p = name; p < name + namelen; p++) { 1556 if (*p == '.') 1557 i++; 1558 } 1559 if (i < 2) 1560 nterm = 2; 1561 else 1562 nterm = 1; 1563 1564 p = name; 1565 while (cp < ep && p < name + namelen) { 1566 i = 0; 1567 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1568 i++; 1569 /* result does not fit into mbuf */ 1570 if (cp + i + 1 >= ep) 1571 goto fail; 1572 /* 1573 * DNS label length restriction, RFC1035 page 8. 1574 * "i == 0" case is included here to avoid returning 1575 * 0-length label on "foo..bar". 1576 */ 1577 if (i <= 0 || i >= 64) 1578 goto fail; 1579 *cp++ = i; 1580 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1581 goto fail; 1582 while (i > 0) { 1583 if (!isalnum(*p) && *p != '-') 1584 goto fail; 1585 if (isupper(*p)) { 1586 *cp++ = tolower(*p); 1587 p++; 1588 } else 1589 *cp++ = *p++; 1590 i--; 1591 } 1592 p = q; 1593 if (p < name + namelen && *p == '.') 1594 p++; 1595 } 1596 /* termination */ 1597 if (cp + nterm >= ep) 1598 goto fail; 1599 while (nterm-- > 0) 1600 *cp++ = '\0'; 1601 m->m_len = cp - mtod(m, char *); 1602 return m; 1603 } 1604 1605 panic("should not reach here"); 1606 /* NOTREACHED */ 1607 1608fail: 1609 if (m) 1610 m_freem(m); 1611 return NULL; 1612} 1613 1614/* 1615 * check if two DNS-encoded string matches. takes care of truncated 1616 * form (with \0\0 at the end). no compression support. 1617 * XXX upper/lowercase match (see RFC2065) 1618 */ 1619static int 1620ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1621{ 1622 const char *a0, *b0; 1623 int l; 1624 1625 /* simplest case - need validation? */ 1626 if (alen == blen && memcmp(a, b, alen) == 0) 1627 return 1; 1628 1629 a0 = a; 1630 b0 = b; 1631 1632 /* termination is mandatory */ 1633 if (alen < 2 || blen < 2) 1634 return 0; 1635 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1636 return 0; 1637 alen--; 1638 blen--; 1639 1640 while (a - a0 < alen && b - b0 < blen) { 1641 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1642 return 0; 1643 1644 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1645 return 0; 1646 /* we don't support compression yet */ 1647 if (a[0] >= 64 || b[0] >= 64) 1648 return 0; 1649 1650 /* truncated case */ 1651 if (a[0] == 0 && a - a0 == alen - 1) 1652 return 1; 1653 if (b[0] == 0 && b - b0 == blen - 1) 1654 return 1; 1655 if (a[0] == 0 || b[0] == 0) 1656 return 0; 1657 1658 if (a[0] != b[0]) 1659 return 0; 1660 l = a[0]; 1661 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1662 return 0; 1663 if (memcmp(a + 1, b + 1, l) != 0) 1664 return 0; 1665 1666 a += 1 + l; 1667 b += 1 + l; 1668 } 1669 1670 if (a - a0 == alen && b - b0 == blen) 1671 return 1; 1672 else 1673 return 0; 1674} 1675 1676/* 1677 * calculate the number of addresses to be returned in the node info reply. 1678 */ 1679static int 1680ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj, 1681 struct psref *psref) 1682{ 1683 struct ifnet *ifp; 1684 struct in6_ifaddr *ia6; 1685 struct ifaddr *ifa; 1686 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1687 int addrs = 0, addrsofif, iffound = 0; 1688 int niflags = ni6->ni_flags; 1689 int s; 1690 1691 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1692 switch (ni6->ni_code) { 1693 case ICMP6_NI_SUBJ_IPV6: 1694 if (subj == NULL) /* must be impossible... */ 1695 return 0; 1696 subj_ip6 = (struct sockaddr_in6 *)subj; 1697 break; 1698 default: 1699 /* 1700 * XXX: we only support IPv6 subject address for 1701 * this Qtype. 1702 */ 1703 return 0; 1704 } 1705 } 1706 1707 s = pserialize_read_enter(); 1708 IFNET_READER_FOREACH(ifp) { 1709 addrsofif = 0; 1710 IFADDR_READER_FOREACH(ifa, ifp) { 1711 if (ifa->ifa_addr->sa_family != AF_INET6) 1712 continue; 1713 ia6 = (struct in6_ifaddr *)ifa; 1714 1715 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1716 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1717 &ia6->ia_addr.sin6_addr)) 1718 iffound = 1; 1719 1720 /* 1721 * IPv4-mapped addresses can only be returned by a 1722 * Node Information proxy, since they represent 1723 * addresses of IPv4-only nodes, which perforce do 1724 * not implement this protocol. 1725 * [icmp-name-lookups-07, Section 5.4] 1726 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1727 * this function at this moment. 1728 */ 1729 1730 /* What do we have to do about ::1? */ 1731 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1732 case IPV6_ADDR_SCOPE_LINKLOCAL: 1733 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1734 continue; 1735 break; 1736 case IPV6_ADDR_SCOPE_SITELOCAL: 1737 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1738 continue; 1739 break; 1740 case IPV6_ADDR_SCOPE_GLOBAL: 1741 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1742 continue; 1743 break; 1744 default: 1745 continue; 1746 } 1747 1748 /* 1749 * check if anycast is okay. 1750 * XXX: just experimental. not in the spec. 1751 */ 1752 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1753 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1754 continue; /* we need only unicast addresses */ 1755 1756 addrsofif++; /* count the address */ 1757 } 1758 if (iffound) { 1759 if_acquire(ifp, psref); 1760 pserialize_read_exit(s); 1761 *ifpp = ifp; 1762 return addrsofif; 1763 } 1764 1765 addrs += addrsofif; 1766 } 1767 pserialize_read_exit(s); 1768 1769 return addrs; 1770} 1771 1772static int 1773ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1774 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1775 int resid) 1776{ 1777 struct ifnet *ifp; 1778 struct in6_ifaddr *ia6; 1779 struct ifaddr *ifa; 1780 struct ifnet *ifp_dep = NULL; 1781 int copied = 0, allow_deprecated = 0; 1782 u_char *cp = (u_char *)(nni6 + 1); 1783 int niflags = ni6->ni_flags; 1784 u_int32_t ltime; 1785 int s; 1786 1787 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1788 return 0; /* needless to copy */ 1789 1790 s = pserialize_read_enter(); 1791 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1792again: 1793 1794 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1795 { 1796 IFADDR_READER_FOREACH(ifa, ifp) { 1797 if (ifa->ifa_addr->sa_family != AF_INET6) 1798 continue; 1799 ia6 = (struct in6_ifaddr *)ifa; 1800 1801 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1802 allow_deprecated == 0) { 1803 /* 1804 * prefererred address should be put before 1805 * deprecated addresses. 1806 */ 1807 1808 /* record the interface for later search */ 1809 if (ifp_dep == NULL) 1810 ifp_dep = ifp; 1811 1812 continue; 1813 } 1814 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1815 allow_deprecated != 0) 1816 continue; /* we now collect deprecated addrs */ 1817 1818 /* What do we have to do about ::1? */ 1819 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1820 case IPV6_ADDR_SCOPE_LINKLOCAL: 1821 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1822 continue; 1823 break; 1824 case IPV6_ADDR_SCOPE_SITELOCAL: 1825 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1826 continue; 1827 break; 1828 case IPV6_ADDR_SCOPE_GLOBAL: 1829 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1830 continue; 1831 break; 1832 default: 1833 continue; 1834 } 1835 1836 /* 1837 * check if anycast is okay. 1838 * XXX: just experimental. not in the spec. 1839 */ 1840 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1841 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1842 continue; 1843 1844 /* now we can copy the address */ 1845 if (resid < sizeof(struct in6_addr) + 1846 sizeof(u_int32_t)) { 1847 /* 1848 * We give up much more copy. 1849 * Set the truncate flag and return. 1850 */ 1851 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1852 goto out; 1853 } 1854 1855 /* 1856 * Set the TTL of the address. 1857 * The TTL value should be one of the following 1858 * according to the specification: 1859 * 1860 * 1. The remaining lifetime of a DHCP lease on the 1861 * address, or 1862 * 2. The remaining Valid Lifetime of a prefix from 1863 * which the address was derived through Stateless 1864 * Autoconfiguration. 1865 * 1866 * Note that we currently do not support stateful 1867 * address configuration by DHCPv6, so the former 1868 * case can't happen. 1869 * 1870 * TTL must be 2^31 > TTL >= 0. 1871 */ 1872 if (ia6->ia6_lifetime.ia6t_expire == 0) 1873 ltime = ND6_INFINITE_LIFETIME; 1874 else { 1875 if (ia6->ia6_lifetime.ia6t_expire > 1876 time_uptime) 1877 ltime = ia6->ia6_lifetime.ia6t_expire - 1878 time_uptime; 1879 else 1880 ltime = 0; 1881 } 1882 if (ltime > 0x7fffffff) 1883 ltime = 0x7fffffff; 1884 ltime = htonl(ltime); 1885 1886 memcpy(cp, <ime, sizeof(u_int32_t)); 1887 cp += sizeof(u_int32_t); 1888 1889 /* copy the address itself */ 1890 bcopy(&ia6->ia_addr.sin6_addr, cp, 1891 sizeof(struct in6_addr)); 1892 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1893 cp += sizeof(struct in6_addr); 1894 1895 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1896 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1897 } 1898 if (ifp0) /* we need search only on the specified IF */ 1899 break; 1900 } 1901 1902 if (allow_deprecated == 0 && ifp_dep != NULL) { 1903 ifp = ifp_dep; 1904 allow_deprecated = 1; 1905 1906 goto again; 1907 } 1908out: 1909 pserialize_read_exit(s); 1910 return copied; 1911} 1912 1913/* 1914 * XXX almost dup'ed code with rip6_input. 1915 */ 1916static int 1917icmp6_rip6_input(struct mbuf **mp, int off) 1918{ 1919 struct mbuf *m = *mp; 1920 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1921 struct inpcb_hdr *inph; 1922 struct in6pcb *in6p; 1923 struct in6pcb *last = NULL; 1924 struct sockaddr_in6 rip6src; 1925 struct icmp6_hdr *icmp6; 1926 struct mbuf *n, *opts = NULL; 1927 1928 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1929 if (icmp6 == NULL) { 1930 /* m is already reclaimed */ 1931 return IPPROTO_DONE; 1932 } 1933 1934 /* 1935 * XXX: the address may have embedded scope zone ID, which should be 1936 * hidden from applications. 1937 */ 1938 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1939 if (sa6_recoverscope(&rip6src)) { 1940 m_freem(m); 1941 return IPPROTO_DONE; 1942 } 1943 1944 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1945 in6p = (struct in6pcb *)inph; 1946 if (in6p->in6p_af != AF_INET6) 1947 continue; 1948 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1949 continue; 1950 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1951 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1952 continue; 1953 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1954 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1955 continue; 1956 if (in6p->in6p_icmp6filt && 1957 ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1958 in6p->in6p_icmp6filt)) 1959 continue; 1960 1961 if (last == NULL) { 1962 ; 1963 } 1964#ifdef IPSEC 1965 else if (ipsec_used && ipsec_in_reject(m, last)) { 1966 /* do not inject data into pcb */ 1967 } 1968#endif 1969 else if ((n = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT)) != NULL) { 1970 if (last->in6p_flags & IN6P_CONTROLOPTS) 1971 ip6_savecontrol(last, &opts, ip6, n); 1972 /* strip intermediate headers */ 1973 m_adj(n, off); 1974 if (sbappendaddr(&last->in6p_socket->so_rcv, 1975 sin6tosa(&rip6src), n, opts) == 0) { 1976 soroverflow(last->in6p_socket); 1977 m_freem(n); 1978 if (opts) 1979 m_freem(opts); 1980 } else { 1981 sorwakeup(last->in6p_socket); 1982 } 1983 opts = NULL; 1984 } 1985 1986 last = in6p; 1987 } 1988 1989#ifdef IPSEC 1990 if (ipsec_used && last && ipsec_in_reject(m, last)) { 1991 m_freem(m); 1992 IP6_STATDEC(IP6_STAT_DELIVERED); 1993 /* do not inject data into pcb */ 1994 } else 1995#endif 1996 if (last) { 1997 if (last->in6p_flags & IN6P_CONTROLOPTS) 1998 ip6_savecontrol(last, &opts, ip6, m); 1999 /* strip intermediate headers */ 2000 m_adj(m, off); 2001 if (sbappendaddr(&last->in6p_socket->so_rcv, 2002 sin6tosa(&rip6src), m, opts) == 0) { 2003 soroverflow(last->in6p_socket); 2004 m_freem(m); 2005 if (opts) 2006 m_freem(opts); 2007 } else { 2008 sorwakeup(last->in6p_socket); 2009 } 2010 } else { 2011 m_freem(m); 2012 IP6_STATDEC(IP6_STAT_DELIVERED); 2013 } 2014 return IPPROTO_DONE; 2015} 2016 2017/* 2018 * Reflect the ip6 packet back to the source. 2019 * OFF points to the icmp6 header, counted from the top of the mbuf. 2020 * 2021 * Note: RFC 1885 required that an echo reply should be truncated if it 2022 * did not fit in with (return) path MTU, and KAME code supported the 2023 * behavior. However, as a clarification after the RFC, this limitation 2024 * was removed in a revised version of the spec, RFC 2463. We had kept the 2025 * old behavior, with a (non-default) ifdef block, while the new version of 2026 * the spec was an internet-draft status, and even after the new RFC was 2027 * published. But it would rather make sense to clean the obsoleted part 2028 * up, and to make the code simpler at this stage. 2029 */ 2030static void 2031icmp6_reflect(struct mbuf *m, size_t off) 2032{ 2033 struct ip6_hdr *ip6; 2034 struct icmp6_hdr *icmp6; 2035 const struct in6_ifaddr *ia; 2036 const struct ip6aux *ip6a; 2037 int plen; 2038 int type, code; 2039 struct ifnet *outif = NULL; 2040 struct in6_addr origdst; 2041 struct ifnet *rcvif; 2042 int s; 2043 bool ip6_src_filled = false; 2044 2045 /* too short to reflect */ 2046 if (off < sizeof(struct ip6_hdr)) { 2047 nd6log(LOG_DEBUG, 2048 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2049 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2050 __FILE__, __LINE__); 2051 goto bad; 2052 } 2053 2054 /* 2055 * If there are extra headers between IPv6 and ICMPv6, strip 2056 * off that header first. 2057 */ 2058 CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN); 2059 if (off > sizeof(struct ip6_hdr)) { 2060 size_t l; 2061 struct ip6_hdr nip6; 2062 2063 l = off - sizeof(struct ip6_hdr); 2064 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2065 m_adj(m, l); 2066 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2067 if (m->m_len < l) { 2068 if ((m = m_pullup(m, l)) == NULL) 2069 return; 2070 } 2071 memcpy(mtod(m, void *), (void *)&nip6, sizeof(nip6)); 2072 } else { 2073 size_t l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2074 if (m->m_len < l) { 2075 if ((m = m_pullup(m, l)) == NULL) 2076 return; 2077 } 2078 } 2079 2080 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2081 ip6 = mtod(m, struct ip6_hdr *); 2082 ip6->ip6_nxt = IPPROTO_ICMPV6; 2083 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2084 type = icmp6->icmp6_type; /* keep type for statistics */ 2085 code = icmp6->icmp6_code; /* ditto. */ 2086 2087 origdst = ip6->ip6_dst; 2088 /* 2089 * ip6_input() drops a packet if its src is multicast. 2090 * So, the src is never multicast. 2091 */ 2092 ip6->ip6_dst = ip6->ip6_src; 2093 2094 /* 2095 * If the incoming packet was addressed directly to us (i.e. unicast), 2096 * use dst as the src for the reply. 2097 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2098 * (for example) when we encounter an error while forwarding procedure 2099 * destined to a duplicated address of ours. 2100 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2101 * procedure of an outgoing packet of our own, in which case we need 2102 * to search in the ifaddr list. 2103 */ 2104 if (IN6_IS_ADDR_MULTICAST(&origdst)) { 2105 ; 2106 } else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2107 if ((ip6a->ip6a_flags & 2108 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2109 ip6->ip6_src = ip6a->ip6a_src; 2110 ip6_src_filled = true; 2111 } 2112 } else { 2113 union { 2114 struct sockaddr_in6 sin6; 2115 struct sockaddr sa; 2116 } u; 2117 int _s; 2118 struct ifaddr *ifa; 2119 2120 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2121 2122 _s = pserialize_read_enter(); 2123 ifa = ifa_ifwithaddr(&u.sa); 2124 2125 if (ifa != NULL) { 2126 ia = ifatoia6(ifa); 2127 if ((ia->ia6_flags & 2128 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2129 ip6->ip6_src = ia->ia_addr.sin6_addr; 2130 ip6_src_filled = true; 2131 } 2132 } 2133 pserialize_read_exit(_s); 2134 } 2135 2136 if (!ip6_src_filled) { 2137 int e; 2138 struct sockaddr_in6 sin6; 2139 struct route ro; 2140 2141 /* 2142 * This case matches to multicasts, our anycast, or unicasts 2143 * that we do not own. Select a source address based on the 2144 * source address of the erroneous packet. 2145 */ 2146 /* zone ID should be embedded */ 2147 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2148 2149 memset(&ro, 0, sizeof(ro)); 2150 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2151 &ip6->ip6_src); 2152 rtcache_free(&ro); 2153 if (e != 0) { 2154 char ip6buf[INET6_ADDRSTRLEN]; 2155 nd6log(LOG_DEBUG, 2156 "source can't be determined: " 2157 "dst=%s, error=%d\n", 2158 IN6_PRINT(ip6buf, &sin6.sin6_addr), e); 2159 goto bad; 2160 } 2161 } 2162 2163 ip6->ip6_flow = 0; 2164 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2165 ip6->ip6_vfc |= IPV6_VERSION; 2166 ip6->ip6_nxt = IPPROTO_ICMPV6; 2167 rcvif = m_get_rcvif(m, &s); 2168 if (rcvif) { 2169 /* XXX: This may not be the outgoing interface */ 2170 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2171 } else { 2172 ip6->ip6_hlim = ip6_defhlim; 2173 } 2174 m_put_rcvif(rcvif, &s); 2175 2176 m->m_pkthdr.csum_flags = 0; 2177 icmp6->icmp6_cksum = 0; 2178 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2179 sizeof(struct ip6_hdr), plen); 2180 2181 /* 2182 * XXX option handling 2183 */ 2184 2185 m->m_flags &= ~(M_BCAST|M_MCAST); 2186 2187 /* 2188 * To avoid a "too big" situation at an intermediate router 2189 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2190 * Note that only echo and node information replies are affected, 2191 * since the length of ICMP6 errors is limited to the minimum MTU. 2192 */ 2193 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) != 0 && 2194 outif) 2195 icmp6_ifstat_inc(outif, ifs6_out_error); 2196 if (outif) 2197 icmp6_ifoutstat_inc(outif, type, code); 2198 2199 return; 2200 2201 bad: 2202 m_freem(m); 2203 return; 2204} 2205 2206static const char * 2207icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6, 2208 struct in6_addr *dst6, struct in6_addr *tgt6) 2209{ 2210 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 2211 char ip6buft[INET6_ADDRSTRLEN]; 2212 2213 snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)", 2214 IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6), 2215 IN6_PRINT(ip6buft, tgt6)); 2216 return buf; 2217} 2218 2219static void 2220icmp6_redirect_input(struct mbuf *m, int off) 2221{ 2222 struct ifnet *ifp; 2223 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2224 struct nd_redirect *nd_rd; 2225 int icmp6len = m->m_pkthdr.len - off; 2226 char *lladdr = NULL; 2227 int lladdrlen = 0; 2228 struct rtentry *rt = NULL; 2229 int is_router; 2230 int is_onlink; 2231 struct in6_addr src6 = ip6->ip6_src; 2232 struct in6_addr redtgt6; 2233 struct in6_addr reddst6; 2234 union nd_opts ndopts; 2235 struct psref psref; 2236 char ip6buf[INET6_ADDRSTRLEN]; 2237 char diagbuf[256]; 2238 2239 ifp = m_get_rcvif_psref(m, &psref); 2240 if (ifp == NULL) 2241 goto freeit; 2242 2243 /* XXX if we are router, we don't update route by icmp6 redirect */ 2244 if (ip6_forwarding) 2245 goto freeit; 2246 if (!icmp6_rediraccept) 2247 goto freeit; 2248 2249 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2250 if (nd_rd == NULL) { 2251 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2252 m_put_rcvif_psref(ifp, &psref); 2253 return; 2254 } 2255 redtgt6 = nd_rd->nd_rd_target; 2256 reddst6 = nd_rd->nd_rd_dst; 2257 2258 if (in6_setscope(&redtgt6, ifp, NULL) || 2259 in6_setscope(&reddst6, ifp, NULL)) { 2260 goto freeit; 2261 } 2262 2263 /* validation */ 2264 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2265 nd6log(LOG_ERR, 2266 "ICMP6 redirect sent from %s rejected; " 2267 "must be from linklocal\n", IN6_PRINT(ip6buf, &src6)); 2268 goto bad; 2269 } 2270 if (ip6->ip6_hlim != 255) { 2271 nd6log(LOG_ERR, 2272 "ICMP6 redirect sent from %s rejected; " 2273 "hlim=%d (must be 255)\n", 2274 IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim); 2275 goto bad; 2276 } 2277 2278 { 2279 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2280 struct sockaddr_in6 sin6; 2281 struct in6_addr *gw6; 2282 2283 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2284 rt = rtalloc1(sin6tosa(&sin6), 0); 2285 if (rt) { 2286 if (rt->rt_gateway == NULL || 2287 rt->rt_gateway->sa_family != AF_INET6) { 2288 nd6log(LOG_ERR, 2289 "ICMP6 redirect rejected; no route " 2290 "with inet6 gateway found for redirect dst: %s\n", 2291 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2292 &src6, &reddst6, &redtgt6)); 2293 rt_unref(rt); 2294 goto bad; 2295 } 2296 2297 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2298 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2299 nd6log(LOG_ERR, 2300 "ICMP6 redirect rejected; " 2301 "not equal to gw-for-src=%s (must be same): %s\n", 2302 IN6_PRINT(ip6buf, gw6), 2303 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2304 &src6, &reddst6, &redtgt6)); 2305 rt_unref(rt); 2306 goto bad; 2307 } 2308 } else { 2309 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2310 "no route found for redirect dst: %s\n", 2311 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2312 &src6, &reddst6, &redtgt6)); 2313 goto bad; 2314 } 2315 rt_unref(rt); 2316 rt = NULL; 2317 } 2318 2319 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2320 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2321 "redirect dst must be unicast: %s\n", 2322 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2323 &src6, &reddst6, &redtgt6)); 2324 goto bad; 2325 } 2326 2327 is_router = is_onlink = 0; 2328 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2329 is_router = 1; /* router case */ 2330 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2331 is_onlink = 1; /* on-link destination case */ 2332 if (!is_router && !is_onlink) { 2333 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2334 "neither router case nor onlink case: %s\n", 2335 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2336 &src6, &reddst6, &redtgt6)); 2337 goto bad; 2338 } 2339 /* validation passed */ 2340 2341 icmp6len -= sizeof(*nd_rd); 2342 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2343 if (nd6_options(&ndopts) < 0) { 2344 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2345 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2346 &src6, &reddst6, &redtgt6)); 2347 /* nd6_options have incremented stats */ 2348 goto freeit; 2349 } 2350 2351 if (ndopts.nd_opts_tgt_lladdr) { 2352 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2353 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2354 } 2355 2356 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2357 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2358 "(if %d, icmp6 packet %d): %s\n", 2359 IN6_PRINT(ip6buf, &redtgt6), 2360 ifp->if_addrlen, lladdrlen - 2, 2361 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2362 &src6, &reddst6, &redtgt6)); 2363 goto bad; 2364 } 2365 2366 /* RFC 2461 8.3 */ 2367 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2368 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2369 2370 m_put_rcvif_psref(ifp, &psref); 2371 ifp = NULL; 2372 2373 if (!is_onlink) { /* better router case. perform rtredirect. */ 2374 /* perform rtredirect */ 2375 struct sockaddr_in6 sdst; 2376 struct sockaddr_in6 sgw; 2377 struct sockaddr_in6 ssrc; 2378 unsigned long rtcount; 2379 struct rtentry *newrt = NULL; 2380 2381 /* 2382 * do not install redirect route, if the number of entries 2383 * is too much (> hiwat). note that, the node (= host) will 2384 * work just fine even if we do not install redirect route 2385 * (there will be additional hops, though). 2386 */ 2387 mutex_enter(&icmp6_mtx); 2388 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2389 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) { 2390 mutex_exit(&icmp6_mtx); 2391 goto freeit; 2392 } 2393 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) { 2394 mutex_exit(&icmp6_mtx); 2395 goto freeit; 2396 } else if (0 <= icmp6_redirect_lowat && 2397 rtcount > icmp6_redirect_lowat) { 2398 /* 2399 * XXX nuke a victim, install the new one. 2400 */ 2401 } 2402 2403 memset(&sdst, 0, sizeof(sdst)); 2404 memset(&sgw, 0, sizeof(sgw)); 2405 memset(&ssrc, 0, sizeof(ssrc)); 2406 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2407 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2408 sizeof(struct sockaddr_in6); 2409 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2410 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2411 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2412 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2413 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), &newrt); 2414 2415 if (newrt) { 2416 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2417 icmp6_redirect_timeout_q); 2418 rt_unref(newrt); 2419 } 2420 mutex_exit(&icmp6_mtx); 2421 } 2422 /* finally update cached route in each socket via pfctlinput */ 2423 { 2424 struct sockaddr_in6 sdst; 2425 2426 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2427 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2428#if defined(IPSEC) 2429 if (ipsec_used) 2430 key_sa_routechange(sin6tosa(&sdst)); 2431#endif 2432 } 2433 2434freeit: 2435 if (ifp != NULL) 2436 m_put_rcvif_psref(ifp, &psref); 2437 m_freem(m); 2438 return; 2439 2440bad: 2441 m_put_rcvif_psref(ifp, &psref); 2442 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2443 m_freem(m); 2444} 2445 2446void 2447icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2448{ 2449 struct ifnet *ifp; /* my outgoing interface */ 2450 struct in6_addr *ifp_ll6; 2451 struct in6_addr *nexthop; 2452 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2453 struct mbuf *m = NULL; /* newly allocated one */ 2454 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2455 struct nd_redirect *nd_rd; 2456 size_t maxlen; 2457 u_char *p; 2458 struct sockaddr_in6 src_sa; 2459 2460 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2461 2462 /* if we are not router, we don't send icmp6 redirect */ 2463 if (!ip6_forwarding) 2464 goto fail; 2465 2466 /* sanity check */ 2467 KASSERT(m0 != NULL); 2468 KASSERT(rt != NULL); 2469 2470 ifp = rt->rt_ifp; 2471 2472 /* 2473 * Address check: 2474 * the source address must identify a neighbor, and 2475 * the destination address must not be a multicast address 2476 * [RFC 2461, sec 8.2] 2477 */ 2478 sip6 = mtod(m0, struct ip6_hdr *); 2479 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2480 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2481 goto fail; 2482 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2483 goto fail; /* what should we do here? */ 2484 2485 /* rate limit */ 2486 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2487 goto fail; 2488 2489 /* 2490 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2491 * we almost always ask for an mbuf cluster for simplicity. 2492 * (MHLEN < IPV6_MMTU is almost always true) 2493 */ 2494 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2495 if (m && IPV6_MMTU >= MHLEN) { 2496#if IPV6_MMTU >= MCLBYTES 2497 MEXTMALLOC(m, IPV6_MMTU, M_NOWAIT); 2498#else 2499 MCLGET(m, M_DONTWAIT); 2500#endif 2501 } 2502 2503 if (!m) 2504 goto fail; 2505 m_reset_rcvif(m); 2506 m->m_len = 0; 2507 maxlen = M_TRAILINGSPACE(m); 2508 maxlen = min(IPV6_MMTU, maxlen); 2509 2510 /* just for safety */ 2511 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct nd_redirect) + 2512 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2513 goto fail; 2514 } 2515 2516 { 2517 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2518 struct in6_ifaddr *ia; 2519 int s = pserialize_read_enter(); 2520 if ((ia = in6ifa_ifpforlinklocal(ifp, 2521 IN6_IFF_NOTREADY| 2522 IN6_IFF_ANYCAST)) == NULL) { 2523 pserialize_read_exit(s); 2524 goto fail; 2525 } 2526 ifp_ll6 = &ia->ia_addr.sin6_addr; 2527 pserialize_read_exit(s); 2528 } 2529 2530 /* get ip6 linklocal address for the router. */ 2531 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2532 struct sockaddr_in6 *sin6; 2533 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2534 nexthop = &sin6->sin6_addr; 2535 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2536 nexthop = NULL; 2537 } else 2538 nexthop = NULL; 2539 2540 /* ip6 */ 2541 ip6 = mtod(m, struct ip6_hdr *); 2542 ip6->ip6_flow = 0; 2543 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2544 ip6->ip6_vfc |= IPV6_VERSION; 2545 /* ip6->ip6_plen will be set later */ 2546 ip6->ip6_nxt = IPPROTO_ICMPV6; 2547 ip6->ip6_hlim = 255; 2548 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2549 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2550 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2551 2552 /* ND Redirect */ 2553 nd_rd = (struct nd_redirect *)(ip6 + 1); 2554 nd_rd->nd_rd_type = ND_REDIRECT; 2555 nd_rd->nd_rd_code = 0; 2556 nd_rd->nd_rd_reserved = 0; 2557 if (rt->rt_flags & RTF_GATEWAY) { 2558 /* 2559 * nd_rd->nd_rd_target must be a link-local address in 2560 * better router cases. 2561 */ 2562 if (!nexthop) 2563 goto fail; 2564 bcopy(nexthop, &nd_rd->nd_rd_target, 2565 sizeof(nd_rd->nd_rd_target)); 2566 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2567 sizeof(nd_rd->nd_rd_dst)); 2568 } else { 2569 /* make sure redtgt == reddst */ 2570 nexthop = &sip6->ip6_dst; 2571 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2572 sizeof(nd_rd->nd_rd_target)); 2573 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2574 sizeof(nd_rd->nd_rd_dst)); 2575 } 2576 2577 p = (u_char *)(nd_rd + 1); 2578 2579 { 2580 /* target lladdr option */ 2581 struct llentry *ln = NULL; 2582 int len, pad; 2583 struct nd_opt_hdr *nd_opt; 2584 char *lladdr; 2585 2586 ln = nd6_lookup(nexthop, ifp, false); 2587 if (ln == NULL) 2588 goto nolladdropt; 2589 len = sizeof(*nd_opt) + ifp->if_addrlen; 2590 len = (len + 7) & ~7; /* round by 8 */ 2591 pad = len - (sizeof(*nd_opt) + ifp->if_addrlen); 2592 2593 /* safety check */ 2594 if (len + (p - (u_char *)ip6) > maxlen) { 2595 LLE_RUNLOCK(ln); 2596 goto nolladdropt; 2597 } 2598 2599 if (ln->la_flags & LLE_VALID) { 2600 nd_opt = (struct nd_opt_hdr *)p; 2601 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2602 nd_opt->nd_opt_len = len >> 3; 2603 lladdr = (char *)(nd_opt + 1); 2604 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2605 memset(lladdr + ifp->if_addrlen, 0, pad); 2606 p += len; 2607 } 2608 LLE_RUNLOCK(ln); 2609 } 2610nolladdropt: 2611 2612 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2613 2614 /* just to be safe */ 2615 if (m0->m_flags & M_DECRYPTED) 2616 goto noredhdropt; 2617 if (p - (u_char *)ip6 > maxlen) 2618 goto noredhdropt; 2619 2620 { 2621 /* redirected header option */ 2622 int len; 2623 struct nd_opt_rd_hdr *nd_opt_rh; 2624 2625 /* 2626 * compute the maximum size for icmp6 redirect header option. 2627 * XXX room for auth header? 2628 */ 2629 len = maxlen - (p - (u_char *)ip6); 2630 len &= ~7; 2631 2632 if (len < sizeof(*nd_opt_rh)) { 2633 goto noredhdropt; 2634 } 2635 2636 /* 2637 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2638 * about padding/truncate rule for the original IP packet. 2639 * From the discussion on IPv6imp in Feb 1999, 2640 * the consensus was: 2641 * - "attach as much as possible" is the goal 2642 * - pad if not aligned (original size can be guessed by 2643 * original ip6 header) 2644 * Following code adds the padding if it is simple enough, 2645 * and truncates if not. 2646 */ 2647 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2648 /* not enough room, truncate */ 2649 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2650 m0->m_pkthdr.len); 2651 } else { 2652 /* 2653 * enough room, truncate if not aligned. 2654 * we don't pad here for simplicity. 2655 */ 2656 int extra; 2657 2658 extra = m0->m_pkthdr.len % 8; 2659 if (extra) { 2660 /* truncate */ 2661 m_adj(m0, -extra); 2662 } 2663 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2664 } 2665 2666 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2667 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2668 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2669 nd_opt_rh->nd_opt_rh_len = len >> 3; 2670 p += sizeof(*nd_opt_rh); 2671 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2672 2673 /* connect m0 to m */ 2674 m->m_pkthdr.len += m0->m_pkthdr.len; 2675 m_cat(m, m0); 2676 m0 = NULL; 2677 } 2678noredhdropt: 2679 if (m0) { 2680 m_freem(m0); 2681 m0 = NULL; 2682 } 2683 2684 /* XXX: clear embedded link IDs in the inner header */ 2685 in6_clearscope(&sip6->ip6_src); 2686 in6_clearscope(&sip6->ip6_dst); 2687 in6_clearscope(&nd_rd->nd_rd_target); 2688 in6_clearscope(&nd_rd->nd_rd_dst); 2689 2690 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2691 2692 nd_rd->nd_rd_cksum = 0; 2693 nd_rd->nd_rd_cksum = 2694 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2695 2696 /* send the packet to outside... */ 2697 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2698 icmp6_ifstat_inc(ifp, ifs6_out_error); 2699 2700 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2701 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2702 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2703 2704 return; 2705 2706fail: 2707 if (m) 2708 m_freem(m); 2709 if (m0) 2710 m_freem(m0); 2711} 2712 2713/* 2714 * ICMPv6 socket option processing. 2715 */ 2716int 2717icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2718{ 2719 int error = 0; 2720 struct in6pcb *in6p = sotoin6pcb(so); 2721 2722 if (sopt->sopt_level != IPPROTO_ICMPV6) 2723 return rip6_ctloutput(op, so, sopt); 2724 2725 switch (op) { 2726 case PRCO_SETOPT: 2727 switch (sopt->sopt_name) { 2728 case ICMP6_FILTER: 2729 { 2730 struct icmp6_filter fil; 2731 2732 error = sockopt_get(sopt, &fil, sizeof(fil)); 2733 if (error) 2734 break; 2735 memcpy(in6p->in6p_icmp6filt, &fil, 2736 sizeof(struct icmp6_filter)); 2737 error = 0; 2738 break; 2739 } 2740 2741 default: 2742 error = ENOPROTOOPT; 2743 break; 2744 } 2745 break; 2746 2747 case PRCO_GETOPT: 2748 switch (sopt->sopt_name) { 2749 case ICMP6_FILTER: 2750 { 2751 if (in6p->in6p_icmp6filt == NULL) { 2752 error = EINVAL; 2753 break; 2754 } 2755 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2756 sizeof(struct icmp6_filter)); 2757 break; 2758 } 2759 2760 default: 2761 error = ENOPROTOOPT; 2762 break; 2763 } 2764 break; 2765 } 2766 2767 return error; 2768} 2769 2770/* 2771 * Perform rate limit check. 2772 * Returns 0 if it is okay to send the icmp6 packet. 2773 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2774 * limitation. 2775 * 2776 * XXX per-destination/type check necessary? 2777 */ 2778static int 2779icmp6_ratelimit( 2780 const struct in6_addr *dst, /* not used at this moment */ 2781 const int type, /* not used at this moment */ 2782 const int code) /* not used at this moment */ 2783{ 2784 int ret; 2785 2786 ret = 0; /* okay to send */ 2787 2788 /* PPS limit */ 2789 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2790 icmp6errppslim)) { 2791 /* The packet is subject to rate limit */ 2792 ret++; 2793 } 2794 2795 return ret; 2796} 2797 2798static struct rtentry * 2799icmp6_mtudisc_clone(struct sockaddr *dst) 2800{ 2801 struct rtentry *rt; 2802 int error; 2803 2804 rt = rtalloc1(dst, 1); 2805 if (rt == NULL) 2806 return NULL; 2807 2808 /* If we didn't get a host route, allocate one */ 2809 if ((rt->rt_flags & RTF_HOST) == 0) { 2810 struct rtentry *nrt; 2811 2812 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2813 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2814 if (error) { 2815 rt_unref(rt); 2816 return NULL; 2817 } 2818 nrt->rt_rmx = rt->rt_rmx; 2819 rt_unref(rt); 2820 rt = nrt; 2821 } 2822 2823 mutex_enter(&icmp6_mtx); 2824 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2825 icmp6_mtudisc_timeout_q); 2826 mutex_exit(&icmp6_mtx); 2827 2828 if (error) { 2829 rt_unref(rt); 2830 return NULL; 2831 } 2832 2833 return rt; /* caller need to call rtfree() */ 2834} 2835 2836static void 2837icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2838{ 2839 2840 KASSERT(rt != NULL); 2841 rt_assert_referenced(rt); 2842 2843 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2844 (RTF_DYNAMIC | RTF_HOST)) { 2845 rtrequest(RTM_DELETE, rt_getkey(rt), 2846 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2847 } else { 2848 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2849 rt->rt_rmx.rmx_mtu = 0; 2850 } 2851} 2852 2853static void 2854icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2855{ 2856 2857 KASSERT(rt != NULL); 2858 rt_assert_referenced(rt); 2859 2860 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2861 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2862 rtrequest(RTM_DELETE, rt_getkey(rt), 2863 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2864 } 2865} 2866 2867/* 2868 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2869 */ 2870static int 2871sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2872{ 2873 (void)&name; 2874 (void)&l; 2875 (void)&oname; 2876 2877 if (namelen != 0) 2878 return (EINVAL); 2879 2880 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2881 /*XXXUNCONST*/ 2882 __UNCONST(newp), newlen)); 2883} 2884 2885static int 2886sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2887{ 2888 2889 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2890} 2891 2892static int 2893sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2894{ 2895 int error, tmp; 2896 struct sysctlnode node; 2897 2898 mutex_enter(&icmp6_mtx); 2899 2900 node = *rnode; 2901 node.sysctl_data = &tmp; 2902 tmp = icmp6_redirtimeout; 2903 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2904 if (error || newp == NULL) 2905 goto out; 2906 if (tmp < 0) { 2907 error = EINVAL; 2908 goto out; 2909 } 2910 icmp6_redirtimeout = tmp; 2911 2912 if (icmp6_redirect_timeout_q != NULL) { 2913 if (icmp6_redirtimeout == 0) { 2914 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2915 } else { 2916 rt_timer_queue_change(icmp6_redirect_timeout_q, 2917 icmp6_redirtimeout); 2918 } 2919 } else if (icmp6_redirtimeout > 0) { 2920 icmp6_redirect_timeout_q = 2921 rt_timer_queue_create(icmp6_redirtimeout); 2922 } 2923 error = 0; 2924out: 2925 mutex_exit(&icmp6_mtx); 2926 return error; 2927} 2928 2929static void 2930sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2931{ 2932 extern int nd6_maxqueuelen; /* defined in nd6.c */ 2933 2934 sysctl_createv(clog, 0, NULL, NULL, 2935 CTLFLAG_PERMANENT, 2936 CTLTYPE_NODE, "inet6", NULL, 2937 NULL, 0, NULL, 0, 2938 CTL_NET, PF_INET6, CTL_EOL); 2939 sysctl_createv(clog, 0, NULL, NULL, 2940 CTLFLAG_PERMANENT, 2941 CTLTYPE_NODE, "icmp6", 2942 SYSCTL_DESCR("ICMPv6 related settings"), 2943 NULL, 0, NULL, 0, 2944 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2945 2946 sysctl_createv(clog, 0, NULL, NULL, 2947 CTLFLAG_PERMANENT, 2948 CTLTYPE_STRUCT, "stats", 2949 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2950 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2951 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2952 ICMPV6CTL_STATS, CTL_EOL); 2953 sysctl_createv(clog, 0, NULL, NULL, 2954 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2955 CTLTYPE_INT, "rediraccept", 2956 SYSCTL_DESCR("Accept and process redirect messages"), 2957 NULL, 0, &icmp6_rediraccept, 0, 2958 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2959 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2960 sysctl_createv(clog, 0, NULL, NULL, 2961 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2962 CTLTYPE_INT, "redirtimeout", 2963 SYSCTL_DESCR("Redirect generated route lifetime"), 2964 sysctl_net_inet6_icmp6_redirtimeout, 0, 2965 &icmp6_redirtimeout, 0, 2966 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2967 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2968#if 0 /* obsoleted */ 2969 sysctl_createv(clog, 0, NULL, NULL, 2970 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2971 CTLTYPE_INT, "errratelimit", NULL, 2972 NULL, 0, &icmp6_errratelimit, 0, 2973 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2974 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2975#endif 2976 sysctl_createv(clog, 0, NULL, NULL, 2977 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2978 CTLTYPE_INT, "nd6_prune", 2979 SYSCTL_DESCR("Neighbor discovery prune interval"), 2980 NULL, 0, &nd6_prune, 0, 2981 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2982 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2983 sysctl_createv(clog, 0, NULL, NULL, 2984 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2985 CTLTYPE_INT, "nd6_delay", 2986 SYSCTL_DESCR("First probe delay time"), 2987 NULL, 0, &nd6_delay, 0, 2988 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2989 ICMPV6CTL_ND6_DELAY, CTL_EOL); 2990 sysctl_createv(clog, 0, NULL, NULL, 2991 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2992 CTLTYPE_INT, "nd6_umaxtries", 2993 SYSCTL_DESCR("Number of unicast discovery attempts"), 2994 NULL, 0, &nd6_umaxtries, 0, 2995 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2996 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 2997 sysctl_createv(clog, 0, NULL, NULL, 2998 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2999 CTLTYPE_INT, "nd6_mmaxtries", 3000 SYSCTL_DESCR("Number of multicast discovery attempts"), 3001 NULL, 0, &nd6_mmaxtries, 0, 3002 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3003 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 3004 sysctl_createv(clog, 0, NULL, NULL, 3005 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3006 CTLTYPE_INT, "nd6_useloopback", 3007 SYSCTL_DESCR("Use loopback interface for local traffic"), 3008 NULL, 0, &nd6_useloopback, 0, 3009 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3010 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 3011#if 0 /* obsoleted */ 3012 sysctl_createv(clog, 0, NULL, NULL, 3013 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3014 CTLTYPE_INT, "nd6_proxyall", NULL, 3015 NULL, 0, &nd6_proxyall, 0, 3016 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3017 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 3018#endif 3019 sysctl_createv(clog, 0, NULL, NULL, 3020 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3021 CTLTYPE_INT, "nodeinfo", 3022 SYSCTL_DESCR("Respond to node information requests"), 3023 NULL, 0, &icmp6_nodeinfo, 0, 3024 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3025 ICMPV6CTL_NODEINFO, CTL_EOL); 3026 sysctl_createv(clog, 0, NULL, NULL, 3027 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3028 CTLTYPE_INT, "errppslimit", 3029 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 3030 NULL, 0, &icmp6errppslim, 0, 3031 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3032 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 3033 sysctl_createv(clog, 0, NULL, NULL, 3034 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3035 CTLTYPE_INT, "nd6_maxnudhint", 3036 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 3037 NULL, 0, &nd6_maxnudhint, 0, 3038 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3039 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 3040 sysctl_createv(clog, 0, NULL, NULL, 3041 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3042 CTLTYPE_INT, "mtudisc_hiwat", 3043 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3044 NULL, 0, &icmp6_mtudisc_hiwat, 0, 3045 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3046 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 3047 sysctl_createv(clog, 0, NULL, NULL, 3048 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3049 CTLTYPE_INT, "mtudisc_lowat", 3050 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3051 NULL, 0, &icmp6_mtudisc_lowat, 0, 3052 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3053 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 3054 sysctl_createv(clog, 0, NULL, NULL, 3055 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3056 CTLTYPE_INT, "nd6_debug", 3057 SYSCTL_DESCR("Enable neighbor discovery debug output"), 3058 NULL, 0, &nd6_debug, 0, 3059 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3060 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 3061 sysctl_createv(clog, 0, NULL, NULL, 3062 CTLFLAG_PERMANENT, 3063 CTLTYPE_STRUCT, "nd6_drlist", 3064 SYSCTL_DESCR("Default router list"), 3065 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3066 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3067 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 3068 sysctl_createv(clog, 0, NULL, NULL, 3069 CTLFLAG_PERMANENT, 3070 CTLTYPE_STRUCT, "nd6_prlist", 3071 SYSCTL_DESCR("Prefix list"), 3072 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3073 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3074 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 3075 sysctl_createv(clog, 0, NULL, NULL, 3076 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3077 CTLTYPE_INT, "maxqueuelen", 3078 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3079 NULL, 1, &nd6_maxqueuelen, 0, 3080 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3081 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3082} 3083 3084void 3085icmp6_statinc(u_int stat) 3086{ 3087 3088 KASSERT(stat < ICMP6_NSTATS); 3089 ICMP6_STATINC(stat); 3090} 3091