1 /* $NetBSD: icmp6.c,v 1.252 2022/08/29 09:14:02 knakahara 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 1.252 2022/08/29 09:14:02 knakahara Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_compat_netbsd.h" 69 #include "opt_inet.h" 70 #include "opt_ipsec.h" 71 #endif 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/kmem.h> 76 #include <sys/mbuf.h> 77 #include <sys/protosw.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/time.h> 81 #include <sys/kernel.h> 82 #include <sys/syslog.h> 83 #include <sys/domain.h> 84 #include <sys/sysctl.h> 85 86 #include <net/if.h> 87 #include <net/route.h> 88 #include <net/if_dl.h> 89 #include <net/if_types.h> 90 #include <net/nd.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_var.h> 94 #include <netinet/ip6.h> 95 #include <netinet/wqinput.h> 96 #include <netinet6/ip6_var.h> 97 #include <netinet6/ip6_private.h> 98 #include <netinet/icmp6.h> 99 #include <netinet6/icmp6_private.h> 100 #include <netinet6/mld6_var.h> 101 #include <netinet6/in6_pcb.h> 102 #include <netinet6/in6_ifattach.h> 103 #include <netinet6/ip6protosw.h> 104 #include <netinet6/nd6.h> 105 #include <netinet6/scope6_var.h> 106 107 #ifdef IPSEC 108 #include <netipsec/ipsec.h> 109 #include <netipsec/ipsec6.h> 110 #include <netipsec/key.h> 111 #endif 112 113 #include "faith.h" 114 #if defined(NFAITH) && 0 < NFAITH 115 #include <net/if_faith.h> 116 #endif 117 118 /* Ensure that non packed structures are the desired size. */ 119 __CTASSERT(sizeof(struct icmp6_hdr) == 8); 120 __CTASSERT(sizeof(struct icmp6_nodeinfo) == 16); 121 __CTASSERT(sizeof(struct icmp6_namelookup) == 20); 122 __CTASSERT(sizeof(struct icmp6_router_renum) == 16); 123 124 __CTASSERT(sizeof(struct nd_router_solicit) == 8); 125 __CTASSERT(sizeof(struct nd_router_advert) == 16); 126 __CTASSERT(sizeof(struct nd_neighbor_solicit) == 24); 127 __CTASSERT(sizeof(struct nd_neighbor_advert) == 24); 128 __CTASSERT(sizeof(struct nd_redirect) == 40); 129 __CTASSERT(sizeof(struct nd_opt_hdr) == 2); 130 __CTASSERT(sizeof(struct nd_opt_route_info) == 8); 131 __CTASSERT(sizeof(struct nd_opt_prefix_info) == 32); 132 __CTASSERT(sizeof(struct nd_opt_rd_hdr) == 8); 133 __CTASSERT(sizeof(struct nd_opt_mtu) == 8); 134 __CTASSERT(sizeof(struct nd_opt_nonce) == 2 + ND_OPT_NONCE_LEN); 135 __CTASSERT(sizeof(struct nd_opt_rdnss) == 8); 136 __CTASSERT(sizeof(struct nd_opt_dnssl) == 8); 137 138 __CTASSERT(sizeof(struct mld_hdr) == 24); 139 __CTASSERT(sizeof(struct ni_reply_fqdn) == 8); 140 __CTASSERT(sizeof(struct rr_pco_match) == 24); 141 __CTASSERT(sizeof(struct rr_pco_use) == 32); 142 __CTASSERT(sizeof(struct rr_result) == 24); 143 144 extern struct domain inet6domain; 145 146 percpu_t *icmp6stat_percpu; 147 148 extern struct inpcbtable raw6cbtable; 149 extern int icmp6errppslim; 150 static int icmp6errpps_count = 0; 151 static struct timeval icmp6errppslim_last; 152 extern int icmp6_nodeinfo; 153 154 bool icmp6_dynamic_rt_msg = false; 155 156 /* 157 * List of callbacks to notify when Path MTU changes are made. 158 */ 159 struct icmp6_mtudisc_callback { 160 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 161 void (*mc_func)(struct in6_addr *); 162 }; 163 164 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 165 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 166 167 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 168 extern int pmtu_expire; 169 170 /* XXX do these values make any sense? */ 171 static int icmp6_mtudisc_hiwat = 1280; 172 static int icmp6_mtudisc_lowat = 256; 173 174 /* 175 * keep track of # of redirect routes. 176 */ 177 static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 178 179 /* XXX experimental, turned off */ 180 static int icmp6_redirect_hiwat = -1; 181 static int icmp6_redirect_lowat = -1; 182 183 /* Protect mtudisc and redirect stuffs */ 184 static kmutex_t icmp6_mtx __cacheline_aligned; 185 186 static bool icmp6_reflect_pmtu = false; 187 188 static void icmp6_errcount(u_int, int, int); 189 static int icmp6_rip6_input(struct mbuf **, int); 190 static void icmp6_reflect(struct mbuf *, size_t); 191 static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 192 static const char *icmp6_redirect_diag(char *, size_t, struct in6_addr *, 193 struct in6_addr *, struct in6_addr *); 194 static void icmp6_redirect_input(struct mbuf *, int); 195 static struct mbuf *ni6_input(struct mbuf *, int); 196 static struct mbuf *ni6_nametodns(const char *, int, int); 197 static int ni6_dnsmatch(const char *, int, const char *, int); 198 static int ni6_addrs(struct icmp6_nodeinfo *, struct ifnet **, char *, 199 struct psref *); 200 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 201 struct ifnet *, int); 202 static int icmp6_notify_error(struct mbuf *, int, int, int); 203 static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 204 static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 205 static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 206 static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 207 208 /* workqueue-based pr_input */ 209 static struct wqinput *icmp6_wqinput; 210 static void _icmp6_input(struct mbuf *m, int off, int proto); 211 212 void 213 icmp6_init(void) 214 { 215 216 sysctl_net_inet6_icmp6_setup(NULL); 217 mld_init(); 218 219 mutex_init(&icmp6_mtx, MUTEX_DEFAULT, IPL_NONE); 220 mutex_enter(&icmp6_mtx); 221 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 222 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 223 mutex_exit(&icmp6_mtx); 224 225 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS); 226 227 icmp6_wqinput = wqinput_create("icmp6", _icmp6_input); 228 } 229 230 static void 231 icmp6_errcount(u_int base, int type, int code) 232 { 233 switch (type) { 234 case ICMP6_DST_UNREACH: 235 switch (code) { 236 case ICMP6_DST_UNREACH_NOROUTE: 237 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE); 238 return; 239 case ICMP6_DST_UNREACH_ADMIN: 240 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN); 241 return; 242 case ICMP6_DST_UNREACH_BEYONDSCOPE: 243 ICMP6_STATINC(base + 244 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE); 245 return; 246 case ICMP6_DST_UNREACH_ADDR: 247 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR); 248 return; 249 case ICMP6_DST_UNREACH_NOPORT: 250 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT); 251 return; 252 } 253 break; 254 case ICMP6_PACKET_TOO_BIG: 255 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG); 256 return; 257 case ICMP6_TIME_EXCEEDED: 258 switch (code) { 259 case ICMP6_TIME_EXCEED_TRANSIT: 260 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT); 261 return; 262 case ICMP6_TIME_EXCEED_REASSEMBLY: 263 ICMP6_STATINC(base + 264 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY); 265 return; 266 } 267 break; 268 case ICMP6_PARAM_PROB: 269 switch (code) { 270 case ICMP6_PARAMPROB_HEADER: 271 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER); 272 return; 273 case ICMP6_PARAMPROB_NEXTHEADER: 274 ICMP6_STATINC(base + 275 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER); 276 return; 277 case ICMP6_PARAMPROB_OPTION: 278 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION); 279 return; 280 } 281 break; 282 case ND_REDIRECT: 283 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT); 284 return; 285 } 286 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN); 287 } 288 289 /* 290 * Register a Path MTU Discovery callback. 291 */ 292 void 293 icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *)) 294 { 295 struct icmp6_mtudisc_callback *mc, *new; 296 297 new = kmem_alloc(sizeof(*mc), KM_SLEEP); 298 299 mutex_enter(&icmp6_mtx); 300 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 301 mc = LIST_NEXT(mc, mc_list)) { 302 if (mc->mc_func == func) { 303 mutex_exit(&icmp6_mtx); 304 kmem_free(new, sizeof(*mc)); 305 return; 306 } 307 } 308 309 new->mc_func = func; 310 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, new, mc_list); 311 mutex_exit(&icmp6_mtx); 312 } 313 314 /* 315 * A wrapper function for icmp6_error() necessary when the erroneous packet 316 * may not contain enough scope zone information. 317 */ 318 void 319 icmp6_error2(struct mbuf *m, int type, int code, int param, 320 struct ifnet *ifp, struct in6_addr *src) 321 { 322 struct ip6_hdr *ip6; 323 324 KASSERT(ifp != NULL); 325 326 if (m->m_len < sizeof(struct ip6_hdr)) { 327 m = m_pullup(m, sizeof(struct ip6_hdr)); 328 if (m == NULL) 329 return; 330 } 331 332 ip6 = mtod(m, struct ip6_hdr *); 333 334 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 335 goto out; 336 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 337 goto out; 338 339 *src = ip6->ip6_src; 340 icmp6_error(m, type, code, param); 341 return; 342 343 out: 344 m_freem(m); 345 } 346 347 /* 348 * Generate an error packet of type error in response to bad IP6 packet. 349 */ 350 void 351 icmp6_error(struct mbuf *m, int type, int code, int param) 352 { 353 struct ip6_hdr *oip6, *nip6; 354 struct icmp6_hdr *icmp6; 355 u_int preplen; 356 int off; 357 int nxt; 358 359 ICMP6_STATINC(ICMP6_STAT_ERROR); 360 361 /* count per-type-code statistics */ 362 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); 363 364 if (m->m_flags & M_DECRYPTED) { 365 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 366 goto freeit; 367 } 368 369 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && 370 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) 371 return; 372 oip6 = mtod(m, struct ip6_hdr *); 373 374 /* 375 * If the destination address of the erroneous packet is a multicast 376 * address, or the packet was sent using link-layer multicast, 377 * we should basically suppress sending an error (RFC 2463, Section 378 * 2.4). 379 * We have two exceptions (the item e.2 in that section): 380 * - the Packet Too Big message can be sent for path MTU discovery. 381 * - the Parameter Problem Message that can be allowed an icmp6 error 382 * in the option type field. This check has been done in 383 * ip6_unknown_opt(), so we can just check the type and code. 384 */ 385 if ((m->m_flags & (M_BCAST|M_MCAST) || 386 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 387 (type != ICMP6_PACKET_TOO_BIG && 388 (type != ICMP6_PARAM_PROB || 389 code != ICMP6_PARAMPROB_OPTION))) 390 goto freeit; 391 392 /* 393 * RFC 2463, 2.4 (e.5): source address check. 394 * XXX: the case of anycast source? 395 */ 396 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 397 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 398 goto freeit; 399 400 /* 401 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 402 * don't do it. 403 */ 404 nxt = -1; 405 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 406 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 407 struct icmp6_hdr *icp; 408 409 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 410 sizeof(*icp)); 411 if (icp == NULL) { 412 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 413 return; 414 } 415 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 416 icp->icmp6_type == ND_REDIRECT) { 417 /* 418 * ICMPv6 error 419 * Special case: for redirect (which is 420 * informational) we must not send icmp6 error. 421 */ 422 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 423 goto freeit; 424 } else { 425 /* ICMPv6 informational - send the error */ 426 } 427 } else { 428 /* non-ICMPv6 - send the error */ 429 } 430 431 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 432 433 /* Finally, do rate limitation check. */ 434 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 435 ICMP6_STATINC(ICMP6_STAT_TOOFREQ); 436 goto freeit; 437 } 438 439 /* 440 * OK, ICMP6 can be generated. 441 */ 442 443 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 444 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 445 446 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 447 M_PREPEND(m, preplen, M_DONTWAIT); 448 if (m && M_UNWRITABLE(m, preplen)) 449 m = m_pullup(m, preplen); 450 if (m == NULL) { 451 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__); 452 return; 453 } 454 455 nip6 = mtod(m, struct ip6_hdr *); 456 nip6->ip6_src = oip6->ip6_src; 457 nip6->ip6_dst = oip6->ip6_dst; 458 459 in6_clearscope(&oip6->ip6_src); 460 in6_clearscope(&oip6->ip6_dst); 461 462 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 463 icmp6->icmp6_type = type; 464 icmp6->icmp6_code = code; 465 icmp6->icmp6_pptr = htonl((u_int32_t)param); 466 467 /* 468 * icmp6_reflect() is designed to be in the input path. 469 * icmp6_error() can be called from both input and output path, 470 * and if we are in output path rcvif could contain bogus value. 471 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 472 * information in ip header (nip6). 473 */ 474 m_reset_rcvif(m); 475 476 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 477 478 /* header order: IPv6 - ICMPv6 */ 479 icmp6_reflect(m, sizeof(struct ip6_hdr)); 480 481 return; 482 483 freeit: 484 /* 485 * If we can't tell whether or not we can generate ICMP6, free it. 486 */ 487 m_freem(m); 488 } 489 490 /* 491 * Process a received ICMP6 message. 492 */ 493 static void 494 _icmp6_input(struct mbuf *m, int off, int proto) 495 { 496 struct mbuf *n; 497 struct ip6_hdr *ip6, *nip6; 498 struct icmp6_hdr *icmp6, *nicmp6; 499 int icmp6len = m->m_pkthdr.len - off; 500 int code, sum; 501 struct ifnet *rcvif; 502 struct psref psref; 503 char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN]; 504 505 rcvif = m_get_rcvif_psref(m, &psref); 506 if (__predict_false(rcvif == NULL)) 507 goto freeit; 508 509 #define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 510 KASSERT(ICMP6_MAXLEN < MCLBYTES); 511 icmp6_ifstat_inc(rcvif, ifs6_in_msg); 512 513 /* 514 * Locate icmp6 structure in mbuf, and check 515 * that not corrupted and of at least minimum length 516 */ 517 518 if (icmp6len < sizeof(struct icmp6_hdr)) { 519 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 520 icmp6_ifstat_inc(rcvif, ifs6_in_error); 521 goto freeit; 522 } 523 524 if (m->m_len < sizeof(struct ip6_hdr)) { 525 m = m_pullup(m, sizeof(struct ip6_hdr)); 526 if (m == NULL) { 527 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 528 icmp6_ifstat_inc(rcvif, ifs6_in_error); 529 goto freeit; 530 } 531 } 532 533 ip6 = mtod(m, struct ip6_hdr *); 534 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 535 if (icmp6 == NULL) { 536 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 537 icmp6_ifstat_inc(rcvif, ifs6_in_error); 538 goto freeit; 539 } 540 541 /* 542 * Enforce alignment requirements that are violated in 543 * some cases, see kern/50766 for details. 544 */ 545 if (ACCESSIBLE_POINTER(icmp6, struct ip6_hdr) == 0) { 546 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0); 547 if (m == NULL) { 548 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 549 icmp6_ifstat_inc(rcvif, ifs6_in_error); 550 goto freeit; 551 } 552 ip6 = mtod(m, struct ip6_hdr *); 553 icmp6 = (struct icmp6_hdr *)(mtod(m, char *) + off); 554 } 555 KASSERT(ACCESSIBLE_POINTER(icmp6, struct ip6_hdr)); 556 557 /* 558 * calculate the checksum 559 */ 560 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 561 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 562 icmp6->icmp6_type, sum, IN6_PRINT(ip6buf, &ip6->ip6_src)); 563 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 564 icmp6_ifstat_inc(rcvif, ifs6_in_error); 565 goto freeit; 566 } 567 568 #if defined(NFAITH) && 0 < NFAITH 569 if (faithprefix(&ip6->ip6_dst)) { 570 /* 571 * Deliver very specific ICMP6 type only. 572 * This is important to deliver TOOBIG. Otherwise PMTUD 573 * will not work. 574 */ 575 switch (icmp6->icmp6_type) { 576 case ICMP6_DST_UNREACH: 577 case ICMP6_PACKET_TOO_BIG: 578 case ICMP6_TIME_EXCEEDED: 579 break; 580 default: 581 goto freeit; 582 } 583 } 584 #endif 585 586 code = icmp6->icmp6_code; 587 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 588 589 switch (icmp6->icmp6_type) { 590 case ICMP6_DST_UNREACH: 591 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 592 switch (code) { 593 case ICMP6_DST_UNREACH_NOROUTE: 594 code = PRC_UNREACH_NET; 595 break; 596 case ICMP6_DST_UNREACH_ADMIN: 597 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 598 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 599 break; 600 case ICMP6_DST_UNREACH_ADDR: 601 code = PRC_HOSTDEAD; 602 break; 603 case ICMP6_DST_UNREACH_BEYONDSCOPE: 604 /* I mean "source address was incorrect." */ 605 code = PRC_UNREACH_NET; 606 break; 607 case ICMP6_DST_UNREACH_NOPORT: 608 code = PRC_UNREACH_PORT; 609 break; 610 default: 611 goto badcode; 612 } 613 goto deliver; 614 615 case ICMP6_PACKET_TOO_BIG: 616 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 617 618 /* 619 * MTU is checked in icmp6_mtudisc. 620 */ 621 code = PRC_MSGSIZE; 622 623 /* 624 * Updating the path MTU will be done after examining 625 * intermediate extension headers. 626 */ 627 goto deliver; 628 629 case ICMP6_TIME_EXCEEDED: 630 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 631 switch (code) { 632 case ICMP6_TIME_EXCEED_TRANSIT: 633 code = PRC_TIMXCEED_INTRANS; 634 break; 635 case ICMP6_TIME_EXCEED_REASSEMBLY: 636 code = PRC_TIMXCEED_REASS; 637 break; 638 default: 639 goto badcode; 640 } 641 goto deliver; 642 643 case ICMP6_PARAM_PROB: 644 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 645 switch (code) { 646 case ICMP6_PARAMPROB_NEXTHEADER: 647 code = PRC_UNREACH_PROTOCOL; 648 break; 649 case ICMP6_PARAMPROB_HEADER: 650 case ICMP6_PARAMPROB_OPTION: 651 code = PRC_PARAMPROB; 652 break; 653 default: 654 goto badcode; 655 } 656 goto deliver; 657 658 case ICMP6_ECHO_REQUEST: 659 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 660 if (code != 0) 661 goto badcode; 662 /* 663 * Copy mbuf to send to two data paths: userland socket(s), 664 * and to the querier (echo reply). 665 * m: a copy for socket, n: a copy for querier 666 * 667 * If the first mbuf is shared, or the first mbuf is too short, 668 * copy the first part of the data into a fresh mbuf. 669 * Otherwise, we will wrongly overwrite both copies. 670 */ 671 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 672 /* Give up local */ 673 n = m; 674 m = NULL; 675 } else if (M_UNWRITABLE(n, off + sizeof(struct icmp6_hdr))) { 676 struct mbuf *n0 = n; 677 678 /* 679 * Prepare an internal mbuf. m_pullup() doesn't 680 * always copy the length we specified. 681 */ 682 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 683 /* Give up local */ 684 n = m; 685 m = NULL; 686 } 687 m_freem(n0); 688 } 689 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 690 sizeof(*nicmp6)); 691 if (nicmp6 == NULL) 692 goto freeit; 693 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 694 nicmp6->icmp6_code = 0; 695 if (n) { 696 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 697 icmp6s[ICMP6_STAT_REFLECT]++; 698 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 699 ICMP6_STAT_PUTREF(); 700 icmp6_reflect(n, off); 701 } 702 if (!m) 703 goto freeit; 704 break; 705 706 case ICMP6_ECHO_REPLY: 707 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 708 if (code != 0) 709 goto badcode; 710 break; 711 712 case MLD_LISTENER_QUERY: 713 case MLD_LISTENER_REPORT: 714 if (icmp6len < sizeof(struct mld_hdr)) 715 goto badlen; 716 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 717 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 718 else 719 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 720 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 721 /* give up local */ 722 mld_input(m, off); 723 m = NULL; 724 goto freeit; 725 } 726 mld_input(n, off); 727 /* m stays. */ 728 break; 729 730 case MLD_LISTENER_DONE: 731 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 732 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 733 goto badlen; 734 break; /* nothing to be done in kernel */ 735 736 case MLD_MTRACE_RESP: 737 case MLD_MTRACE: 738 /* XXX: these two are experimental. not officially defined. */ 739 /* XXX: per-interface statistics? */ 740 break; /* just pass it to applications */ 741 742 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 743 { 744 enum { WRU, FQDN } mode; 745 746 if (!icmp6_nodeinfo) 747 break; 748 749 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 750 mode = WRU; 751 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 752 mode = FQDN; 753 else 754 goto badlen; 755 756 if (mode == FQDN) { 757 n = m_copypacket(m, M_DONTWAIT); 758 if (n) 759 n = ni6_input(n, off); 760 } else { 761 u_char *p; 762 int maxhlen; 763 764 if ((icmp6_nodeinfo & 5) != 5) 765 break; 766 767 if (code != 0) 768 goto badcode; 769 MGETHDR(n, M_DONTWAIT, m->m_type); 770 if (n && ICMP6_MAXLEN > MHLEN) { 771 MCLGET(n, M_DONTWAIT); 772 if ((n->m_flags & M_EXT) == 0) { 773 m_free(n); 774 n = NULL; 775 } 776 } 777 if (n == NULL) { 778 /* Give up remote */ 779 break; 780 } 781 m_reset_rcvif(n); 782 n->m_len = 0; 783 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 784 if (maxhlen < 0) { 785 m_free(n); 786 break; 787 } 788 if (maxhlen > hostnamelen) 789 maxhlen = hostnamelen; 790 /* 791 * Copy IPv6 and ICMPv6 only. 792 */ 793 nip6 = mtod(n, struct ip6_hdr *); 794 memcpy(nip6, ip6, sizeof(struct ip6_hdr)); 795 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 796 memcpy(nicmp6, icmp6, sizeof(struct icmp6_hdr)); 797 798 p = (u_char *)(nicmp6 + 1); 799 memset(p, 0, 4); 800 memcpy(p + 4, hostname, maxhlen); /* meaningless TTL */ 801 802 m_copy_pkthdr(n, m); 803 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 804 sizeof(struct icmp6_hdr) + 4 + maxhlen; 805 nicmp6->icmp6_type = ICMP6_WRUREPLY; 806 nicmp6->icmp6_code = 0; 807 } 808 if (n) { 809 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 810 icmp6s[ICMP6_STAT_REFLECT]++; 811 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 812 ICMP6_STAT_PUTREF(); 813 icmp6_reflect(n, sizeof(struct ip6_hdr)); 814 } 815 break; 816 } 817 818 case ICMP6_WRUREPLY: 819 if (code != 0) 820 goto badcode; 821 break; 822 823 case ND_ROUTER_SOLICIT: 824 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 825 /* FALLTHROUGH */ 826 case ND_ROUTER_ADVERT: 827 if (icmp6->icmp6_type == ND_ROUTER_ADVERT) 828 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 829 if (code != 0) 830 goto badcode; 831 if ((icmp6->icmp6_type == ND_ROUTER_SOLICIT && 832 icmp6len < sizeof(struct nd_router_solicit)) || 833 (icmp6->icmp6_type == ND_ROUTER_ADVERT && 834 icmp6len < sizeof(struct nd_router_advert))) 835 goto badlen; 836 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 837 /* give up local */ 838 nd6_rtr_cache(m, off, icmp6len, icmp6->icmp6_type); 839 m = NULL; 840 goto freeit; 841 } 842 nd6_rtr_cache(n, off, icmp6len, icmp6->icmp6_type); 843 /* m stays. */ 844 break; 845 846 case ND_NEIGHBOR_SOLICIT: 847 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 848 if (code != 0) 849 goto badcode; 850 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 851 goto badlen; 852 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 853 /* give up local */ 854 nd6_ns_input(m, off, icmp6len); 855 m = NULL; 856 goto freeit; 857 } 858 nd6_ns_input(n, off, icmp6len); 859 /* m stays. */ 860 break; 861 862 case ND_NEIGHBOR_ADVERT: 863 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 864 if (code != 0) 865 goto badcode; 866 if (icmp6len < sizeof(struct nd_neighbor_advert)) 867 goto badlen; 868 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 869 /* give up local */ 870 nd6_na_input(m, off, icmp6len); 871 m = NULL; 872 goto freeit; 873 } 874 nd6_na_input(n, off, icmp6len); 875 /* m stays. */ 876 break; 877 878 case ND_REDIRECT: 879 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 880 if (code != 0) 881 goto badcode; 882 if (icmp6len < sizeof(struct nd_redirect)) 883 goto badlen; 884 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 885 /* give up local */ 886 icmp6_redirect_input(m, off); 887 m = NULL; 888 goto freeit; 889 } 890 icmp6_redirect_input(n, off); 891 /* m stays. */ 892 break; 893 894 case ICMP6_ROUTER_RENUMBERING: 895 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 896 code != ICMP6_ROUTER_RENUMBERING_RESULT) 897 goto badcode; 898 if (icmp6len < sizeof(struct icmp6_router_renum)) 899 goto badlen; 900 break; 901 902 default: 903 nd6log(LOG_DEBUG, 904 "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 905 icmp6->icmp6_type, 906 IN6_PRINT(ip6buf, &ip6->ip6_src), 907 IN6_PRINT(ip6buf2, &ip6->ip6_dst), 908 rcvif ? rcvif->if_index : 0); 909 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 910 /* ICMPv6 error: MUST deliver it by spec... */ 911 code = PRC_NCMDS; 912 /* deliver */ 913 } else { 914 /* ICMPv6 informational: MUST not deliver */ 915 break; 916 } 917 deliver: 918 if (icmp6_notify_error(m, off, icmp6len, code)) { 919 /* In this case, m should've been freed. */ 920 m_put_rcvif_psref(rcvif, &psref); 921 return; 922 } 923 break; 924 925 badcode: 926 ICMP6_STATINC(ICMP6_STAT_BADCODE); 927 break; 928 929 badlen: 930 ICMP6_STATINC(ICMP6_STAT_BADLEN); 931 break; 932 } 933 m_put_rcvif_psref(rcvif, &psref); 934 935 /* deliver the packet to appropriate sockets */ 936 icmp6_rip6_input(&m, off); 937 938 return; 939 940 freeit: 941 m_put_rcvif_psref(rcvif, &psref); 942 m_freem(m); 943 return; 944 } 945 946 int 947 icmp6_input(struct mbuf **mp, int *offp, int proto) 948 { 949 950 wqinput_input(icmp6_wqinput, *mp, *offp, proto); 951 952 return IPPROTO_DONE; 953 } 954 955 static int 956 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 957 { 958 struct icmp6_hdr *icmp6; 959 struct ip6_hdr *eip6; 960 u_int32_t notifymtu; 961 struct sockaddr_in6 icmp6src, icmp6dst; 962 963 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 964 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 965 goto freeit; 966 } 967 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 968 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 969 if (icmp6 == NULL) { 970 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 971 return (-1); 972 } 973 eip6 = (struct ip6_hdr *)(icmp6 + 1); 974 975 /* Detect the upper level protocol */ 976 { 977 void *(*ctlfunc)(int, const struct sockaddr *, void *); 978 u_int8_t nxt = eip6->ip6_nxt; 979 int eoff = off + sizeof(struct icmp6_hdr) + 980 sizeof(struct ip6_hdr); 981 struct ip6ctlparam ip6cp; 982 struct in6_addr *finaldst = NULL; 983 int icmp6type = icmp6->icmp6_type; 984 struct ip6_frag *fh; 985 struct ip6_rthdr *rth; 986 struct ifnet *rcvif; 987 int s; 988 989 while (1) { /* XXX: should avoid infinite loop explicitly? */ 990 struct ip6_ext *eh; 991 992 switch (nxt) { 993 case IPPROTO_HOPOPTS: 994 case IPPROTO_DSTOPTS: 995 case IPPROTO_AH: 996 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 997 eoff, sizeof(*eh)); 998 if (eh == NULL) { 999 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1000 return (-1); 1001 } 1002 1003 if (nxt == IPPROTO_AH) 1004 eoff += (eh->ip6e_len + 2) << 2; 1005 else 1006 eoff += (eh->ip6e_len + 1) << 3; 1007 nxt = eh->ip6e_nxt; 1008 break; 1009 case IPPROTO_ROUTING: 1010 /* Ignore the option. */ 1011 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 1012 eoff, sizeof(*rth)); 1013 if (rth == NULL) { 1014 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1015 return (-1); 1016 } 1017 1018 eoff += (rth->ip6r_len + 1) << 3; 1019 nxt = rth->ip6r_nxt; 1020 break; 1021 case IPPROTO_FRAGMENT: 1022 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1023 eoff, sizeof(*fh)); 1024 if (fh == NULL) { 1025 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1026 return (-1); 1027 } 1028 /* 1029 * Data after a fragment header is meaningless 1030 * unless it is the first fragment, but 1031 * we'll go to the notify label for path MTU 1032 * discovery. 1033 */ 1034 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1035 goto notify; 1036 1037 eoff += sizeof(struct ip6_frag); 1038 nxt = fh->ip6f_nxt; 1039 break; 1040 default: 1041 /* 1042 * This case includes ESP and the No Next 1043 * Header. In such cases going to the notify 1044 * label does not have any meaning 1045 * (i.e. ctlfunc will be NULL), but we go 1046 * anyway since we might have to update 1047 * path MTU information. 1048 */ 1049 goto notify; 1050 } 1051 } 1052 notify: 1053 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1054 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1055 if (icmp6 == NULL) { 1056 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1057 return (-1); 1058 } 1059 1060 /* 1061 * retrieve parameters from the inner IPv6 header, and convert 1062 * them into sockaddr structures. 1063 * XXX: there is no guarantee that the source or destination 1064 * addresses of the inner packet are in the same scope zone as 1065 * the addresses of the icmp packet. But there is no other 1066 * way to determine the zone. 1067 */ 1068 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1069 1070 rcvif = m_get_rcvif(m, &s); 1071 if (__predict_false(rcvif == NULL)) 1072 goto freeit; 1073 sockaddr_in6_init(&icmp6dst, 1074 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1075 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1076 m_put_rcvif(rcvif, &s); 1077 goto freeit; 1078 } 1079 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1080 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1081 m_put_rcvif(rcvif, &s); 1082 goto freeit; 1083 } 1084 m_put_rcvif(rcvif, &s); 1085 1086 icmp6src.sin6_flowinfo = 1087 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1088 1089 if (finaldst == NULL) 1090 finaldst = &eip6->ip6_dst; 1091 ip6cp.ip6c_m = m; 1092 ip6cp.ip6c_icmp6 = icmp6; 1093 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1094 ip6cp.ip6c_off = eoff; 1095 ip6cp.ip6c_finaldst = finaldst; 1096 ip6cp.ip6c_src = &icmp6src; 1097 ip6cp.ip6c_nxt = nxt; 1098 1099 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1100 notifymtu = ntohl(icmp6->icmp6_mtu); 1101 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1102 } 1103 1104 ctlfunc = inet6sw[ip6_protox[nxt]].pr_ctlinput; 1105 if (ctlfunc) { 1106 (void)(*ctlfunc)(code, sin6tosa(&icmp6dst), &ip6cp); 1107 } 1108 } 1109 return (0); 1110 1111 freeit: 1112 m_freem(m); 1113 return (-1); 1114 } 1115 1116 void 1117 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1118 { 1119 unsigned long rtcount; 1120 struct icmp6_mtudisc_callback *mc; 1121 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1122 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1123 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1124 u_int mtu = ntohl(icmp6->icmp6_mtu); 1125 struct rtentry *rt = NULL; 1126 struct sockaddr_in6 sin6; 1127 struct ifnet *rcvif; 1128 int s; 1129 1130 /* 1131 * The MTU should not be less than the minimal IPv6 MTU except for the 1132 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1133 * In that one case, the MTU might be less than 1280. 1134 */ 1135 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1136 /* is the mtu even sane? */ 1137 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1138 return; 1139 if (!validated) 1140 return; 1141 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1142 } 1143 1144 /* 1145 * allow non-validated cases if memory is plenty, to make traffic 1146 * from non-connected pcb happy. 1147 */ 1148 mutex_enter(&icmp6_mtx); 1149 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1150 if (validated) { 1151 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) { 1152 mutex_exit(&icmp6_mtx); 1153 return; 1154 } else if (0 <= icmp6_mtudisc_lowat && 1155 rtcount > icmp6_mtudisc_lowat) { 1156 /* 1157 * XXX nuke a victim, install the new one. 1158 */ 1159 } 1160 } else { 1161 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) { 1162 mutex_exit(&icmp6_mtx); 1163 return; 1164 } 1165 } 1166 mutex_exit(&icmp6_mtx); 1167 1168 memset(&sin6, 0, sizeof(sin6)); 1169 sin6.sin6_family = PF_INET6; 1170 sin6.sin6_len = sizeof(struct sockaddr_in6); 1171 sin6.sin6_addr = *dst; 1172 rcvif = m_get_rcvif(m, &s); 1173 if (__predict_false(rcvif == NULL)) 1174 return; 1175 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1176 m_put_rcvif(rcvif, &s); 1177 return; 1178 } 1179 m_put_rcvif(rcvif, &s); 1180 1181 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1182 1183 if (rt && (rt->rt_flags & RTF_HOST) && 1184 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1185 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1186 if (mtu < rt->rt_ifp->if_mtu) { 1187 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1188 rt->rt_rmx.rmx_mtu = mtu; 1189 } 1190 } 1191 if (rt) { 1192 rt_unref(rt); 1193 } 1194 1195 /* 1196 * Notify protocols that the MTU for this destination 1197 * has changed. 1198 */ 1199 mutex_enter(&icmp6_mtx); 1200 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1201 mc = LIST_NEXT(mc, mc_list)) 1202 (*mc->mc_func)(&sin6.sin6_addr); 1203 mutex_exit(&icmp6_mtx); 1204 } 1205 1206 /* 1207 * Process a Node Information Query packet, based on 1208 * draft-ietf-ipngwg-icmp-name-lookups-07. 1209 * 1210 * Spec incompatibilities: 1211 * - IPv6 Subject address handling 1212 * - IPv4 Subject address handling support missing 1213 * - Proxy reply (answer even if it's not for me) 1214 * - joins NI group address at in6_ifattach() time only, does not cope 1215 * with hostname changes by sethostname(3) 1216 */ 1217 static struct mbuf * 1218 ni6_input(struct mbuf *m, int off) 1219 { 1220 struct icmp6_nodeinfo *ni6, *nni6; 1221 struct mbuf *n = NULL; 1222 u_int16_t qtype; 1223 int subjlen; 1224 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1225 struct ni_reply_fqdn *fqdn; 1226 int addrs; /* for NI_QTYPE_NODEADDR */ 1227 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1228 struct sockaddr_in6 sin6; /* ip6_dst */ 1229 struct in6_addr in6_subj; /* subject address */ 1230 struct ip6_hdr *ip6; 1231 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1232 char *subj = NULL; 1233 struct ifnet *rcvif; 1234 int s, ss; 1235 struct ifaddr *ifa; 1236 struct psref psref; 1237 1238 ip6 = mtod(m, struct ip6_hdr *); 1239 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1240 if (ni6 == NULL) { 1241 /* m is already reclaimed */ 1242 return NULL; 1243 } 1244 KASSERT((m->m_flags & M_PKTHDR) != 0); 1245 1246 /* 1247 * Validate IPv6 destination address. 1248 * 1249 * The Responder must discard the Query without further processing 1250 * unless it is one of the Responder's unicast or anycast addresses, or 1251 * a link-local scope multicast address which the Responder has joined. 1252 * [icmp-name-lookups-07, Section 4.] 1253 */ 1254 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1255 /* XXX scopeid */ 1256 ss = pserialize_read_enter(); 1257 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1258 if (ifa != NULL) { 1259 ; /* unicast/anycast, fine */ 1260 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) { 1261 ; /* link-local multicast, fine */ 1262 } else { 1263 pserialize_read_exit(ss); 1264 goto bad; 1265 } 1266 pserialize_read_exit(ss); 1267 1268 /* validate query Subject field. */ 1269 qtype = ntohs(ni6->ni_qtype); 1270 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1271 switch (qtype) { 1272 case NI_QTYPE_NOOP: 1273 case NI_QTYPE_SUPTYPES: 1274 /* 07 draft */ 1275 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1276 break; 1277 /* FALLTHROUGH */ 1278 case NI_QTYPE_FQDN: 1279 case NI_QTYPE_NODEADDR: 1280 case NI_QTYPE_IPV4ADDR: 1281 switch (ni6->ni_code) { 1282 case ICMP6_NI_SUBJ_IPV6: 1283 #if ICMP6_NI_SUBJ_IPV6 != 0 1284 case 0: 1285 #endif 1286 /* 1287 * backward compatibility - try to accept 03 draft 1288 * format, where no Subject is present. 1289 */ 1290 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1291 subjlen == 0) { 1292 oldfqdn++; 1293 break; 1294 } 1295 #if ICMP6_NI_SUBJ_IPV6 != 0 1296 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1297 goto bad; 1298 #endif 1299 1300 if (subjlen != sizeof(sin6.sin6_addr)) 1301 goto bad; 1302 1303 /* 1304 * Validate Subject address. 1305 * 1306 * Not sure what exactly "address belongs to the node" 1307 * means in the spec, is it just unicast, or what? 1308 * 1309 * At this moment we consider Subject address as 1310 * "belong to the node" if the Subject address equals 1311 * to the IPv6 destination address; validation for 1312 * IPv6 destination address should have done enough 1313 * check for us. 1314 * 1315 * We do not do proxy at this moment. 1316 */ 1317 /* m_pulldown instead of copy? */ 1318 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1319 subjlen, (void *)&in6_subj); 1320 rcvif = m_get_rcvif(m, &s); 1321 if (__predict_false(rcvif == NULL)) 1322 goto bad; 1323 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1324 m_put_rcvif(rcvif, &s); 1325 goto bad; 1326 } 1327 m_put_rcvif(rcvif, &s); 1328 1329 subj = (char *)&in6_subj; 1330 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1331 break; 1332 1333 /* 1334 * XXX if we are to allow other cases, we should really 1335 * be careful about scope here. 1336 * basically, we should disallow queries toward IPv6 1337 * destination X with subject Y, if scope(X) > scope(Y). 1338 * if we allow scope(X) > scope(Y), it will result in 1339 * information leakage across scope boundary. 1340 */ 1341 goto bad; 1342 1343 case ICMP6_NI_SUBJ_FQDN: 1344 /* 1345 * Validate Subject name with gethostname(3). 1346 * 1347 * The behavior may need some debate, since: 1348 * - we are not sure if the node has FQDN as 1349 * hostname (returned by gethostname(3)). 1350 * - the code does wildcard match for truncated names. 1351 * however, we are not sure if we want to perform 1352 * wildcard match, if gethostname(3) side has 1353 * truncated hostname. 1354 */ 1355 n = ni6_nametodns(hostname, hostnamelen, 0); 1356 if (!n || n->m_next || n->m_len == 0) 1357 goto bad; 1358 IP6_EXTHDR_GET(subj, char *, m, 1359 off + sizeof(struct icmp6_nodeinfo), subjlen); 1360 if (subj == NULL) 1361 goto bad; 1362 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1363 n->m_len)) { 1364 goto bad; 1365 } 1366 m_freem(n); 1367 n = NULL; 1368 break; 1369 1370 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1371 default: 1372 goto bad; 1373 } 1374 break; 1375 } 1376 1377 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1378 switch (qtype) { 1379 case NI_QTYPE_FQDN: 1380 if ((icmp6_nodeinfo & 1) == 0) 1381 goto bad; 1382 break; 1383 case NI_QTYPE_NODEADDR: 1384 case NI_QTYPE_IPV4ADDR: 1385 if ((icmp6_nodeinfo & 2) == 0) 1386 goto bad; 1387 break; 1388 } 1389 1390 /* guess reply length */ 1391 switch (qtype) { 1392 case NI_QTYPE_NOOP: 1393 break; /* no reply data */ 1394 case NI_QTYPE_SUPTYPES: 1395 replylen += sizeof(u_int32_t); 1396 break; 1397 case NI_QTYPE_FQDN: 1398 /* will append an mbuf */ 1399 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1400 break; 1401 case NI_QTYPE_NODEADDR: 1402 addrs = ni6_addrs(ni6, &ifp, subj, &psref); 1403 replylen += addrs * 1404 (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1405 if (replylen > MCLBYTES) 1406 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1407 break; 1408 case NI_QTYPE_IPV4ADDR: 1409 /* unsupported - should respond with unknown Qtype? */ 1410 goto bad; 1411 default: 1412 /* 1413 * XXX: We must return a reply with the ICMP6 code 1414 * `unknown Qtype' in this case. However we regard the case 1415 * as an FQDN query for backward compatibility. 1416 * Older versions set a random value to this field, 1417 * so it rarely varies in the defined qtypes. 1418 * But the mechanism is not reliable... 1419 * maybe we should obsolete older versions. 1420 */ 1421 qtype = NI_QTYPE_FQDN; 1422 /* will append an mbuf */ 1423 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1424 oldfqdn++; 1425 break; 1426 } 1427 1428 /* allocate an mbuf to reply. */ 1429 MGETHDR(n, M_DONTWAIT, m->m_type); 1430 if (n == NULL) { 1431 goto bad; 1432 } 1433 m_move_pkthdr(n, m); 1434 if (replylen > MHLEN) { 1435 if (replylen > MCLBYTES) { 1436 /* 1437 * XXX: should we try to allocate more? But MCLBYTES 1438 * is probably much larger than IPV6_MMTU... 1439 */ 1440 goto bad; 1441 } 1442 MCLGET(n, M_DONTWAIT); 1443 if ((n->m_flags & M_EXT) == 0) { 1444 goto bad; 1445 } 1446 } 1447 n->m_pkthdr.len = n->m_len = replylen; 1448 1449 /* copy mbuf header and IPv6 + Node Information base headers */ 1450 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1451 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1452 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1453 1454 /* qtype dependent procedure */ 1455 switch (qtype) { 1456 case NI_QTYPE_NOOP: 1457 nni6->ni_code = ICMP6_NI_SUCCESS; 1458 nni6->ni_flags = 0; 1459 break; 1460 case NI_QTYPE_SUPTYPES: 1461 { 1462 u_int32_t v; 1463 nni6->ni_code = ICMP6_NI_SUCCESS; 1464 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1465 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1466 v = (u_int32_t)htonl(0x0000000f); 1467 memcpy(nni6 + 1, &v, sizeof(u_int32_t)); 1468 break; 1469 } 1470 case NI_QTYPE_FQDN: 1471 nni6->ni_code = ICMP6_NI_SUCCESS; 1472 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1473 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 1474 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1475 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1476 /* 1477 * XXX do we really have FQDN in variable "hostname"? 1478 */ 1479 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1480 if (n->m_next == NULL) 1481 goto bad; 1482 /* XXX we assume that n->m_next is not a chain */ 1483 if (n->m_next->m_next != NULL) 1484 goto bad; 1485 n->m_pkthdr.len += n->m_next->m_len; 1486 break; 1487 case NI_QTYPE_NODEADDR: 1488 { 1489 int lenlim, copied; 1490 1491 nni6->ni_code = ICMP6_NI_SUCCESS; 1492 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1493 sizeof(struct icmp6_nodeinfo); 1494 lenlim = M_TRAILINGSPACE(n); 1495 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1496 if_put(ifp, &psref); 1497 ifp = NULL; 1498 /* update mbuf length */ 1499 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1500 sizeof(struct icmp6_nodeinfo) + copied; 1501 break; 1502 } 1503 default: 1504 panic("%s: impossible", __func__); 1505 break; 1506 } 1507 1508 nni6->ni_type = ICMP6_NI_REPLY; 1509 m_freem(m); 1510 return n; 1511 1512 bad: 1513 if_put(ifp, &psref); 1514 m_freem(m); 1515 if (n) 1516 m_freem(n); 1517 return NULL; 1518 } 1519 1520 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1521 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1522 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1523 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1524 1525 /* 1526 * make a mbuf with DNS-encoded string. no compression support. 1527 * 1528 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1529 * treated as truncated name (two \0 at the end). this is a wild guess. 1530 * 1531 * old - return pascal string if non-zero 1532 */ 1533 static struct mbuf * 1534 ni6_nametodns(const char *name, int namelen, int old) 1535 { 1536 struct mbuf *m; 1537 char *cp, *ep; 1538 const char *p, *q; 1539 int i, len, nterm; 1540 1541 if (old) 1542 len = namelen + 1; 1543 else 1544 len = MCLBYTES; 1545 1546 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1547 MGET(m, M_DONTWAIT, MT_DATA); 1548 if (m && len > MLEN) { 1549 MCLGET(m, M_DONTWAIT); 1550 if ((m->m_flags & M_EXT) == 0) 1551 goto fail; 1552 } 1553 if (!m) 1554 goto fail; 1555 m->m_next = NULL; 1556 1557 if (old) { 1558 m->m_len = len; 1559 *mtod(m, char *) = namelen; 1560 memcpy(mtod(m, char *) + 1, name, namelen); 1561 return m; 1562 } else { 1563 m->m_len = 0; 1564 cp = mtod(m, char *); 1565 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1566 1567 /* if not certain about my name, return empty buffer */ 1568 if (namelen == 0) 1569 return m; 1570 1571 /* 1572 * guess if it looks like shortened hostname, or FQDN. 1573 * shortened hostname needs two trailing "\0". 1574 */ 1575 i = 0; 1576 for (p = name; p < name + namelen; p++) { 1577 if (*p == '.') 1578 i++; 1579 } 1580 if (i < 2) 1581 nterm = 2; 1582 else 1583 nterm = 1; 1584 1585 p = name; 1586 while (cp < ep && p < name + namelen) { 1587 i = 0; 1588 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1589 i++; 1590 /* result does not fit into mbuf */ 1591 if (cp + i + 1 >= ep) 1592 goto fail; 1593 /* 1594 * DNS label length restriction, RFC1035 page 8. 1595 * "i == 0" case is included here to avoid returning 1596 * 0-length label on "foo..bar". 1597 */ 1598 if (i <= 0 || i >= 64) 1599 goto fail; 1600 *cp++ = i; 1601 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1602 goto fail; 1603 while (i > 0) { 1604 if (!isalnum(*p) && *p != '-') 1605 goto fail; 1606 if (isupper(*p)) { 1607 *cp++ = tolower(*p); 1608 p++; 1609 } else 1610 *cp++ = *p++; 1611 i--; 1612 } 1613 p = q; 1614 if (p < name + namelen && *p == '.') 1615 p++; 1616 } 1617 /* termination */ 1618 if (cp + nterm >= ep) 1619 goto fail; 1620 while (nterm-- > 0) 1621 *cp++ = '\0'; 1622 m->m_len = cp - mtod(m, char *); 1623 return m; 1624 } 1625 1626 panic("should not reach here"); 1627 /* NOTREACHED */ 1628 1629 fail: 1630 if (m) 1631 m_freem(m); 1632 return NULL; 1633 } 1634 1635 /* 1636 * check if two DNS-encoded string matches. takes care of truncated 1637 * form (with \0\0 at the end). no compression support. 1638 * XXX upper/lowercase match (see RFC2065) 1639 */ 1640 static int 1641 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1642 { 1643 const char *a0, *b0; 1644 int l; 1645 1646 /* simplest case - need validation? */ 1647 if (alen == blen && memcmp(a, b, alen) == 0) 1648 return 1; 1649 1650 a0 = a; 1651 b0 = b; 1652 1653 /* termination is mandatory */ 1654 if (alen < 2 || blen < 2) 1655 return 0; 1656 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1657 return 0; 1658 alen--; 1659 blen--; 1660 1661 while (a - a0 < alen && b - b0 < blen) { 1662 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1663 return 0; 1664 1665 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1666 return 0; 1667 /* we don't support compression yet */ 1668 if (a[0] >= 64 || b[0] >= 64) 1669 return 0; 1670 1671 /* truncated case */ 1672 if (a[0] == 0 && a - a0 == alen - 1) 1673 return 1; 1674 if (b[0] == 0 && b - b0 == blen - 1) 1675 return 1; 1676 if (a[0] == 0 || b[0] == 0) 1677 return 0; 1678 1679 if (a[0] != b[0]) 1680 return 0; 1681 l = a[0]; 1682 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1683 return 0; 1684 if (memcmp(a + 1, b + 1, l) != 0) 1685 return 0; 1686 1687 a += 1 + l; 1688 b += 1 + l; 1689 } 1690 1691 if (a - a0 == alen && b - b0 == blen) 1692 return 1; 1693 else 1694 return 0; 1695 } 1696 1697 /* 1698 * calculate the number of addresses to be returned in the node info reply. 1699 */ 1700 static int 1701 ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj, 1702 struct psref *psref) 1703 { 1704 struct ifnet *ifp; 1705 struct in6_ifaddr *ia6; 1706 struct ifaddr *ifa; 1707 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1708 int addrs = 0, addrsofif, iffound = 0; 1709 int niflags = ni6->ni_flags; 1710 int s; 1711 1712 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1713 switch (ni6->ni_code) { 1714 case ICMP6_NI_SUBJ_IPV6: 1715 if (subj == NULL) /* must be impossible... */ 1716 return 0; 1717 subj_ip6 = (struct sockaddr_in6 *)subj; 1718 break; 1719 default: 1720 /* 1721 * XXX: we only support IPv6 subject address for 1722 * this Qtype. 1723 */ 1724 return 0; 1725 } 1726 } 1727 1728 s = pserialize_read_enter(); 1729 IFNET_READER_FOREACH(ifp) { 1730 addrsofif = 0; 1731 IFADDR_READER_FOREACH(ifa, ifp) { 1732 if (ifa->ifa_addr->sa_family != AF_INET6) 1733 continue; 1734 ia6 = (struct in6_ifaddr *)ifa; 1735 1736 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1737 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1738 &ia6->ia_addr.sin6_addr)) 1739 iffound = 1; 1740 1741 /* 1742 * IPv4-mapped addresses can only be returned by a 1743 * Node Information proxy, since they represent 1744 * addresses of IPv4-only nodes, which perforce do 1745 * not implement this protocol. 1746 * [icmp-name-lookups-07, Section 5.4] 1747 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1748 * this function at this moment. 1749 */ 1750 1751 /* What do we have to do about ::1? */ 1752 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1753 case IPV6_ADDR_SCOPE_LINKLOCAL: 1754 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1755 continue; 1756 break; 1757 case IPV6_ADDR_SCOPE_SITELOCAL: 1758 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1759 continue; 1760 break; 1761 case IPV6_ADDR_SCOPE_GLOBAL: 1762 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1763 continue; 1764 break; 1765 default: 1766 continue; 1767 } 1768 1769 /* 1770 * check if anycast is okay. 1771 * XXX: just experimental. not in the spec. 1772 */ 1773 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1774 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1775 continue; /* we need only unicast addresses */ 1776 1777 addrsofif++; /* count the address */ 1778 } 1779 if (iffound) { 1780 if_acquire(ifp, psref); 1781 pserialize_read_exit(s); 1782 *ifpp = ifp; 1783 return addrsofif; 1784 } 1785 1786 addrs += addrsofif; 1787 } 1788 pserialize_read_exit(s); 1789 1790 return addrs; 1791 } 1792 1793 static int 1794 ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1795 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1796 int resid) 1797 { 1798 struct ifnet *ifp; 1799 struct in6_ifaddr *ia6; 1800 struct ifaddr *ifa; 1801 struct ifnet *ifp_dep = NULL; 1802 int copied = 0, allow_deprecated = 0; 1803 u_char *cp = (u_char *)(nni6 + 1); 1804 int niflags = ni6->ni_flags; 1805 u_int32_t ltime; 1806 int s; 1807 1808 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1809 return 0; /* needless to copy */ 1810 1811 s = pserialize_read_enter(); 1812 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1813 again: 1814 1815 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1816 { 1817 IFADDR_READER_FOREACH(ifa, ifp) { 1818 if (ifa->ifa_addr->sa_family != AF_INET6) 1819 continue; 1820 ia6 = (struct in6_ifaddr *)ifa; 1821 1822 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1823 allow_deprecated == 0) { 1824 /* 1825 * prefererred address should be put before 1826 * deprecated addresses. 1827 */ 1828 1829 /* record the interface for later search */ 1830 if (ifp_dep == NULL) 1831 ifp_dep = ifp; 1832 1833 continue; 1834 } 1835 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1836 allow_deprecated != 0) 1837 continue; /* we now collect deprecated addrs */ 1838 1839 /* What do we have to do about ::1? */ 1840 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1841 case IPV6_ADDR_SCOPE_LINKLOCAL: 1842 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1843 continue; 1844 break; 1845 case IPV6_ADDR_SCOPE_SITELOCAL: 1846 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1847 continue; 1848 break; 1849 case IPV6_ADDR_SCOPE_GLOBAL: 1850 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1851 continue; 1852 break; 1853 default: 1854 continue; 1855 } 1856 1857 /* 1858 * check if anycast is okay. 1859 * XXX: just experimental. not in the spec. 1860 */ 1861 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1862 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1863 continue; 1864 1865 /* now we can copy the address */ 1866 if (resid < sizeof(struct in6_addr) + 1867 sizeof(u_int32_t)) { 1868 /* 1869 * We give up much more copy. 1870 * Set the truncate flag and return. 1871 */ 1872 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1873 goto out; 1874 } 1875 1876 /* 1877 * Set the TTL of the address. 1878 * The TTL value should be one of the following 1879 * according to the specification: 1880 * 1881 * 1. The remaining lifetime of a DHCP lease on the 1882 * address, or 1883 * 2. The remaining Valid Lifetime of a prefix from 1884 * which the address was derived through Stateless 1885 * Autoconfiguration. 1886 * 1887 * Note that we currently do not support stateful 1888 * address configuration by DHCPv6, so the former 1889 * case can't happen. 1890 * 1891 * TTL must be 2^31 > TTL >= 0. 1892 */ 1893 if (ia6->ia6_lifetime.ia6t_expire == 0) 1894 ltime = ND6_INFINITE_LIFETIME; 1895 else { 1896 if (ia6->ia6_lifetime.ia6t_expire > 1897 time_uptime) 1898 ltime = ia6->ia6_lifetime.ia6t_expire - 1899 time_uptime; 1900 else 1901 ltime = 0; 1902 } 1903 if (ltime > 0x7fffffff) 1904 ltime = 0x7fffffff; 1905 ltime = htonl(ltime); 1906 1907 memcpy(cp, <ime, sizeof(u_int32_t)); 1908 cp += sizeof(u_int32_t); 1909 1910 /* copy the address itself */ 1911 bcopy(&ia6->ia_addr.sin6_addr, cp, 1912 sizeof(struct in6_addr)); 1913 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1914 cp += sizeof(struct in6_addr); 1915 1916 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1917 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1918 } 1919 if (ifp0) /* we need search only on the specified IF */ 1920 break; 1921 } 1922 1923 if (allow_deprecated == 0 && ifp_dep != NULL) { 1924 ifp = ifp_dep; 1925 allow_deprecated = 1; 1926 1927 goto again; 1928 } 1929 out: 1930 pserialize_read_exit(s); 1931 return copied; 1932 } 1933 1934 /* 1935 * XXX almost dup'ed code with rip6_input. 1936 */ 1937 static int 1938 icmp6_rip6_input(struct mbuf **mp, int off) 1939 { 1940 struct mbuf *m = *mp; 1941 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1942 struct inpcb_hdr *inph; 1943 struct in6pcb *in6p; 1944 struct in6pcb *last = NULL; 1945 struct sockaddr_in6 rip6src; 1946 struct icmp6_hdr *icmp6; 1947 struct mbuf *n, *opts = NULL; 1948 1949 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1950 if (icmp6 == NULL) { 1951 /* m is already reclaimed */ 1952 return IPPROTO_DONE; 1953 } 1954 1955 /* 1956 * XXX: the address may have embedded scope zone ID, which should be 1957 * hidden from applications. 1958 */ 1959 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1960 if (sa6_recoverscope(&rip6src)) { 1961 m_freem(m); 1962 return IPPROTO_DONE; 1963 } 1964 1965 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1966 in6p = (struct in6pcb *)inph; 1967 if (in6p->in6p_af != AF_INET6) 1968 continue; 1969 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1970 continue; 1971 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1972 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1973 continue; 1974 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1975 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1976 continue; 1977 if (in6p->in6p_icmp6filt && 1978 ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1979 in6p->in6p_icmp6filt)) 1980 continue; 1981 1982 if (last == NULL) { 1983 ; 1984 } 1985 #ifdef IPSEC 1986 else if (ipsec_used && ipsec_in_reject(m, last)) { 1987 /* do not inject data into pcb */ 1988 } 1989 #endif 1990 else if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 1991 if (last->in6p_flags & IN6P_CONTROLOPTS) 1992 ip6_savecontrol(last, &opts, ip6, n); 1993 /* strip intermediate headers */ 1994 m_adj(n, off); 1995 if (sbappendaddr(&last->in6p_socket->so_rcv, 1996 sin6tosa(&rip6src), n, opts) == 0) { 1997 soroverflow(last->in6p_socket); 1998 m_freem(n); 1999 if (opts) 2000 m_freem(opts); 2001 } else { 2002 sorwakeup(last->in6p_socket); 2003 } 2004 opts = NULL; 2005 } 2006 2007 last = in6p; 2008 } 2009 2010 #ifdef IPSEC 2011 if (ipsec_used && last && ipsec_in_reject(m, last)) { 2012 m_freem(m); 2013 IP6_STATDEC(IP6_STAT_DELIVERED); 2014 /* do not inject data into pcb */ 2015 } else 2016 #endif 2017 if (last) { 2018 if (last->in6p_flags & IN6P_CONTROLOPTS) 2019 ip6_savecontrol(last, &opts, ip6, m); 2020 /* strip intermediate headers */ 2021 m_adj(m, off); 2022 if (sbappendaddr(&last->in6p_socket->so_rcv, 2023 sin6tosa(&rip6src), m, opts) == 0) { 2024 soroverflow(last->in6p_socket); 2025 m_freem(m); 2026 if (opts) 2027 m_freem(opts); 2028 } else { 2029 sorwakeup(last->in6p_socket); 2030 } 2031 } else { 2032 m_freem(m); 2033 IP6_STATDEC(IP6_STAT_DELIVERED); 2034 } 2035 return IPPROTO_DONE; 2036 } 2037 2038 /* 2039 * Reflect the ip6 packet back to the source. 2040 * OFF points to the icmp6 header, counted from the top of the mbuf. 2041 * 2042 * Note: RFC 1885 required that an echo reply should be truncated if it 2043 * did not fit in with (return) path MTU, and KAME code supported the 2044 * behavior. However, as a clarification after the RFC, this limitation 2045 * was removed in a revised version of the spec, RFC 2463. We had kept the 2046 * old behavior, with a (non-default) ifdef block, while the new version of 2047 * the spec was an internet-draft status, and even after the new RFC was 2048 * published. But it would rather make sense to clean the obsoleted part 2049 * up, and to make the code simpler at this stage. 2050 */ 2051 static void 2052 icmp6_reflect(struct mbuf *m, size_t off) 2053 { 2054 struct ip6_hdr *ip6; 2055 struct icmp6_hdr *icmp6; 2056 const struct in6_ifaddr *ia; 2057 const struct ip6aux *ip6a; 2058 int plen; 2059 int type, code; 2060 struct ifnet *outif = NULL; 2061 struct in6_addr origdst; 2062 struct ifnet *rcvif; 2063 int s; 2064 bool ip6_src_filled = false; 2065 int flags; 2066 2067 /* too short to reflect */ 2068 if (off < sizeof(struct ip6_hdr)) { 2069 nd6log(LOG_DEBUG, 2070 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2071 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2072 __FILE__, __LINE__); 2073 goto bad; 2074 } 2075 2076 /* 2077 * If there are extra headers between IPv6 and ICMPv6, strip 2078 * off that header first. 2079 */ 2080 CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN); 2081 if (off > sizeof(struct ip6_hdr)) { 2082 size_t l; 2083 struct ip6_hdr nip6; 2084 2085 l = off - sizeof(struct ip6_hdr); 2086 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2087 m_adj(m, l); 2088 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2089 if (m->m_len < l) { 2090 if ((m = m_pullup(m, l)) == NULL) 2091 return; 2092 } 2093 memcpy(mtod(m, void *), (void *)&nip6, sizeof(nip6)); 2094 } else { 2095 size_t l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2096 if (m->m_len < l) { 2097 if ((m = m_pullup(m, l)) == NULL) 2098 return; 2099 } 2100 } 2101 2102 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2103 ip6 = mtod(m, struct ip6_hdr *); 2104 ip6->ip6_nxt = IPPROTO_ICMPV6; 2105 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2106 type = icmp6->icmp6_type; /* keep type for statistics */ 2107 code = icmp6->icmp6_code; /* ditto. */ 2108 2109 origdst = ip6->ip6_dst; 2110 /* 2111 * ip6_input() drops a packet if its src is multicast. 2112 * So, the src is never multicast. 2113 */ 2114 ip6->ip6_dst = ip6->ip6_src; 2115 2116 /* 2117 * If the incoming packet was addressed directly to us (i.e. unicast), 2118 * use dst as the src for the reply. 2119 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2120 * (for example) when we encounter an error while forwarding procedure 2121 * destined to a duplicated address of ours. 2122 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2123 * procedure of an outgoing packet of our own, in which case we need 2124 * to search in the ifaddr list. 2125 */ 2126 if (IN6_IS_ADDR_MULTICAST(&origdst)) { 2127 ; 2128 } else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2129 if ((ip6a->ip6a_flags & 2130 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2131 ip6->ip6_src = ip6a->ip6a_src; 2132 ip6_src_filled = true; 2133 } 2134 } else { 2135 union { 2136 struct sockaddr_in6 sin6; 2137 struct sockaddr sa; 2138 } u; 2139 int _s; 2140 struct ifaddr *ifa; 2141 2142 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2143 2144 _s = pserialize_read_enter(); 2145 ifa = ifa_ifwithaddr(&u.sa); 2146 2147 if (ifa != NULL) { 2148 ia = ifatoia6(ifa); 2149 if ((ia->ia6_flags & 2150 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2151 ip6->ip6_src = ia->ia_addr.sin6_addr; 2152 ip6_src_filled = true; 2153 } 2154 } 2155 pserialize_read_exit(_s); 2156 } 2157 2158 if (!ip6_src_filled) { 2159 int e; 2160 struct sockaddr_in6 sin6; 2161 struct route ro; 2162 2163 /* 2164 * This case matches to multicasts, our anycast, or unicasts 2165 * that we do not own. Select a source address based on the 2166 * source address of the erroneous packet. 2167 */ 2168 /* zone ID should be embedded */ 2169 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2170 2171 memset(&ro, 0, sizeof(ro)); 2172 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2173 &ip6->ip6_src); 2174 rtcache_free(&ro); 2175 if (e != 0) { 2176 char ip6buf[INET6_ADDRSTRLEN]; 2177 nd6log(LOG_DEBUG, 2178 "source can't be determined: " 2179 "dst=%s, error=%d\n", 2180 IN6_PRINT(ip6buf, &sin6.sin6_addr), e); 2181 goto bad; 2182 } 2183 } 2184 2185 ip6->ip6_flow = 0; 2186 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2187 ip6->ip6_vfc |= IPV6_VERSION; 2188 ip6->ip6_nxt = IPPROTO_ICMPV6; 2189 rcvif = m_get_rcvif(m, &s); 2190 if (rcvif) { 2191 /* XXX: This may not be the outgoing interface */ 2192 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2193 } else { 2194 ip6->ip6_hlim = ip6_defhlim; 2195 } 2196 m_put_rcvif(rcvif, &s); 2197 2198 m->m_pkthdr.csum_flags = 0; 2199 icmp6->icmp6_cksum = 0; 2200 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2201 sizeof(struct ip6_hdr), plen); 2202 2203 /* 2204 * XXX option handling 2205 */ 2206 2207 m->m_flags &= ~(M_BCAST|M_MCAST); 2208 2209 /* 2210 * Note for icmp6_reflect_pmtu == false 2211 * To avoid a "too big" situation at an intermediate router 2212 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2213 * Note that only echo and node information replies are affected, 2214 * since the length of ICMP6 errors is limited to the minimum MTU. 2215 */ 2216 flags = icmp6_reflect_pmtu ? 0 : IPV6_MINMTU; 2217 if (ip6_output(m, NULL, NULL, flags, NULL, NULL, &outif) != 0 && 2218 outif) 2219 icmp6_ifstat_inc(outif, ifs6_out_error); 2220 if (outif) 2221 icmp6_ifoutstat_inc(outif, type, code); 2222 2223 return; 2224 2225 bad: 2226 m_freem(m); 2227 return; 2228 } 2229 2230 static const char * 2231 icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6, 2232 struct in6_addr *dst6, struct in6_addr *tgt6) 2233 { 2234 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 2235 char ip6buft[INET6_ADDRSTRLEN]; 2236 2237 snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)", 2238 IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6), 2239 IN6_PRINT(ip6buft, tgt6)); 2240 return buf; 2241 } 2242 2243 static void 2244 icmp6_redirect_input(struct mbuf *m, int off) 2245 { 2246 struct ifnet *ifp; 2247 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2248 struct nd_redirect *nd_rd; 2249 int icmp6len = m->m_pkthdr.len - off; 2250 char *lladdr = NULL; 2251 int lladdrlen = 0; 2252 struct rtentry *rt = NULL; 2253 int is_router; 2254 int is_onlink; 2255 struct in6_addr src6 = ip6->ip6_src; 2256 struct in6_addr redtgt6; 2257 struct in6_addr reddst6; 2258 union nd_opts ndopts; 2259 struct psref psref; 2260 char ip6buf[INET6_ADDRSTRLEN]; 2261 char diagbuf[256]; 2262 2263 ifp = m_get_rcvif_psref(m, &psref); 2264 if (ifp == NULL) 2265 goto freeit; 2266 2267 /* XXX if we are router, we don't update route by icmp6 redirect */ 2268 if (ip6_forwarding) 2269 goto freeit; 2270 if (!icmp6_rediraccept) 2271 goto freeit; 2272 2273 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2274 if (nd_rd == NULL) { 2275 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2276 m_put_rcvif_psref(ifp, &psref); 2277 return; 2278 } 2279 redtgt6 = nd_rd->nd_rd_target; 2280 reddst6 = nd_rd->nd_rd_dst; 2281 2282 if (in6_setscope(&redtgt6, ifp, NULL) || 2283 in6_setscope(&reddst6, ifp, NULL)) { 2284 goto freeit; 2285 } 2286 2287 /* validation */ 2288 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2289 nd6log(LOG_ERR, 2290 "ICMP6 redirect sent from %s rejected; " 2291 "must be from linklocal\n", IN6_PRINT(ip6buf, &src6)); 2292 goto bad; 2293 } 2294 if (ip6->ip6_hlim != 255) { 2295 nd6log(LOG_ERR, 2296 "ICMP6 redirect sent from %s rejected; " 2297 "hlim=%d (must be 255)\n", 2298 IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim); 2299 goto bad; 2300 } 2301 2302 { 2303 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2304 struct sockaddr_in6 sin6; 2305 struct in6_addr *gw6; 2306 2307 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2308 rt = rtalloc1(sin6tosa(&sin6), 0); 2309 if (rt) { 2310 if (rt->rt_gateway == NULL || 2311 rt->rt_gateway->sa_family != AF_INET6) { 2312 nd6log(LOG_ERR, 2313 "ICMP6 redirect rejected; no route " 2314 "with inet6 gateway found for redirect dst: %s\n", 2315 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2316 &src6, &reddst6, &redtgt6)); 2317 rt_unref(rt); 2318 goto bad; 2319 } 2320 2321 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2322 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2323 nd6log(LOG_ERR, 2324 "ICMP6 redirect rejected; " 2325 "not equal to gw-for-src=%s (must be same): %s\n", 2326 IN6_PRINT(ip6buf, gw6), 2327 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2328 &src6, &reddst6, &redtgt6)); 2329 rt_unref(rt); 2330 goto bad; 2331 } 2332 } else { 2333 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2334 "no route found for redirect dst: %s\n", 2335 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2336 &src6, &reddst6, &redtgt6)); 2337 goto bad; 2338 } 2339 rt_unref(rt); 2340 rt = NULL; 2341 } 2342 2343 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2344 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2345 "redirect dst must be unicast: %s\n", 2346 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2347 &src6, &reddst6, &redtgt6)); 2348 goto bad; 2349 } 2350 2351 is_router = is_onlink = 0; 2352 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2353 is_router = 1; /* router case */ 2354 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2355 is_onlink = 1; /* on-link destination case */ 2356 if (!is_router && !is_onlink) { 2357 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2358 "neither router case nor onlink case: %s\n", 2359 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2360 &src6, &reddst6, &redtgt6)); 2361 goto bad; 2362 } 2363 /* validation passed */ 2364 2365 icmp6len -= sizeof(*nd_rd); 2366 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2367 if (nd6_options(&ndopts) < 0) { 2368 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2369 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2370 &src6, &reddst6, &redtgt6)); 2371 /* nd6_options have incremented stats */ 2372 goto freeit; 2373 } 2374 2375 if (ndopts.nd_opts_tgt_lladdr) { 2376 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2377 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2378 } 2379 2380 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2381 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2382 "(if %d, icmp6 packet %d): %s\n", 2383 IN6_PRINT(ip6buf, &redtgt6), 2384 ifp->if_addrlen, lladdrlen - 2, 2385 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2386 &src6, &reddst6, &redtgt6)); 2387 goto bad; 2388 } 2389 2390 /* RFC 2461 8.3 */ 2391 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2392 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2393 2394 m_put_rcvif_psref(ifp, &psref); 2395 ifp = NULL; 2396 2397 if (!is_onlink) { /* better router case. perform rtredirect. */ 2398 /* perform rtredirect */ 2399 struct sockaddr_in6 sdst; 2400 struct sockaddr_in6 sgw; 2401 struct sockaddr_in6 ssrc; 2402 unsigned long rtcount; 2403 struct rtentry *newrt = NULL; 2404 2405 /* 2406 * do not install redirect route, if the number of entries 2407 * is too much (> hiwat). note that, the node (= host) will 2408 * work just fine even if we do not install redirect route 2409 * (there will be additional hops, though). 2410 */ 2411 mutex_enter(&icmp6_mtx); 2412 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2413 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) { 2414 mutex_exit(&icmp6_mtx); 2415 goto freeit; 2416 } 2417 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) { 2418 mutex_exit(&icmp6_mtx); 2419 goto freeit; 2420 } else if (0 <= icmp6_redirect_lowat && 2421 rtcount > icmp6_redirect_lowat) { 2422 /* 2423 * XXX nuke a victim, install the new one. 2424 */ 2425 } 2426 2427 memset(&sdst, 0, sizeof(sdst)); 2428 memset(&sgw, 0, sizeof(sgw)); 2429 memset(&ssrc, 0, sizeof(ssrc)); 2430 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2431 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2432 sizeof(struct sockaddr_in6); 2433 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2434 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2435 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2436 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2437 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), &newrt); 2438 2439 if (newrt) { 2440 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2441 icmp6_redirect_timeout_q); 2442 rt_unref(newrt); 2443 } 2444 mutex_exit(&icmp6_mtx); 2445 } 2446 /* finally update cached route in each socket via pfctlinput */ 2447 { 2448 struct sockaddr_in6 sdst; 2449 2450 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2451 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2452 #if defined(IPSEC) 2453 if (ipsec_used) 2454 key_sa_routechange(sin6tosa(&sdst)); 2455 #endif 2456 } 2457 2458 freeit: 2459 if (ifp != NULL) 2460 m_put_rcvif_psref(ifp, &psref); 2461 m_freem(m); 2462 return; 2463 2464 bad: 2465 m_put_rcvif_psref(ifp, &psref); 2466 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2467 m_freem(m); 2468 } 2469 2470 void 2471 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2472 { 2473 struct ifnet *ifp; /* my outgoing interface */ 2474 struct in6_addr *ifp_ll6; 2475 struct in6_addr *nexthop; 2476 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2477 struct mbuf *m = NULL; /* newly allocated one */ 2478 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2479 struct nd_redirect *nd_rd; 2480 size_t maxlen; 2481 u_char *p; 2482 struct sockaddr_in6 src_sa; 2483 2484 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2485 2486 /* if we are not router, we don't send icmp6 redirect */ 2487 if (!ip6_forwarding) 2488 goto fail; 2489 2490 /* sanity check */ 2491 KASSERT(m0 != NULL); 2492 KASSERT(rt != NULL); 2493 2494 ifp = rt->rt_ifp; 2495 2496 /* 2497 * Address check: 2498 * the source address must identify a neighbor, and 2499 * the destination address must not be a multicast address 2500 * [RFC 2461, sec 8.2] 2501 */ 2502 sip6 = mtod(m0, struct ip6_hdr *); 2503 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2504 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2505 goto fail; 2506 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2507 goto fail; /* what should we do here? */ 2508 2509 /* rate limit */ 2510 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2511 goto fail; 2512 2513 /* 2514 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2515 * we almost always ask for an mbuf cluster for simplicity. 2516 * (MHLEN < IPV6_MMTU is almost always true) 2517 */ 2518 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2519 if (m && IPV6_MMTU >= MHLEN) { 2520 #if IPV6_MMTU >= MCLBYTES 2521 MEXTMALLOC(m, IPV6_MMTU, M_NOWAIT); 2522 #else 2523 MCLGET(m, M_DONTWAIT); 2524 #endif 2525 } 2526 2527 if (!m) 2528 goto fail; 2529 m_reset_rcvif(m); 2530 m->m_len = 0; 2531 maxlen = M_TRAILINGSPACE(m); 2532 maxlen = uimin(IPV6_MMTU, maxlen); 2533 2534 /* just for safety */ 2535 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct nd_redirect) + 2536 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2537 goto fail; 2538 } 2539 2540 { 2541 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2542 struct in6_ifaddr *ia; 2543 int s = pserialize_read_enter(); 2544 if ((ia = in6ifa_ifpforlinklocal(ifp, 2545 IN6_IFF_NOTREADY| 2546 IN6_IFF_ANYCAST)) == NULL) { 2547 pserialize_read_exit(s); 2548 goto fail; 2549 } 2550 ifp_ll6 = &ia->ia_addr.sin6_addr; 2551 pserialize_read_exit(s); 2552 } 2553 2554 /* get ip6 linklocal address for the router. */ 2555 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2556 struct sockaddr_in6 *sin6; 2557 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2558 nexthop = &sin6->sin6_addr; 2559 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2560 nexthop = NULL; 2561 } else 2562 nexthop = NULL; 2563 2564 /* ip6 */ 2565 ip6 = mtod(m, struct ip6_hdr *); 2566 ip6->ip6_flow = 0; 2567 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2568 ip6->ip6_vfc |= IPV6_VERSION; 2569 /* ip6->ip6_plen will be set later */ 2570 ip6->ip6_nxt = IPPROTO_ICMPV6; 2571 ip6->ip6_hlim = 255; 2572 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2573 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2574 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2575 2576 /* ND Redirect */ 2577 nd_rd = (struct nd_redirect *)(ip6 + 1); 2578 nd_rd->nd_rd_type = ND_REDIRECT; 2579 nd_rd->nd_rd_code = 0; 2580 nd_rd->nd_rd_reserved = 0; 2581 if (rt->rt_flags & RTF_GATEWAY) { 2582 /* 2583 * nd_rd->nd_rd_target must be a link-local address in 2584 * better router cases. 2585 */ 2586 if (!nexthop) 2587 goto fail; 2588 bcopy(nexthop, &nd_rd->nd_rd_target, 2589 sizeof(nd_rd->nd_rd_target)); 2590 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2591 sizeof(nd_rd->nd_rd_dst)); 2592 } else { 2593 /* make sure redtgt == reddst */ 2594 nexthop = &sip6->ip6_dst; 2595 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2596 sizeof(nd_rd->nd_rd_target)); 2597 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2598 sizeof(nd_rd->nd_rd_dst)); 2599 } 2600 2601 p = (u_char *)(nd_rd + 1); 2602 2603 { 2604 /* target lladdr option */ 2605 struct llentry *ln = NULL; 2606 int len, pad; 2607 struct nd_opt_hdr *nd_opt; 2608 char *lladdr; 2609 2610 ln = nd6_lookup(nexthop, ifp, false); 2611 if (ln == NULL) 2612 goto nolladdropt; 2613 len = sizeof(*nd_opt) + ifp->if_addrlen; 2614 len = (len + 7) & ~7; /* round by 8 */ 2615 pad = len - (sizeof(*nd_opt) + ifp->if_addrlen); 2616 2617 /* safety check */ 2618 if (len + (p - (u_char *)ip6) > maxlen) { 2619 LLE_RUNLOCK(ln); 2620 goto nolladdropt; 2621 } 2622 2623 if (ln->la_flags & LLE_VALID) { 2624 nd_opt = (struct nd_opt_hdr *)p; 2625 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2626 nd_opt->nd_opt_len = len >> 3; 2627 lladdr = (char *)(nd_opt + 1); 2628 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2629 memset(lladdr + ifp->if_addrlen, 0, pad); 2630 p += len; 2631 } 2632 LLE_RUNLOCK(ln); 2633 } 2634 nolladdropt: 2635 2636 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2637 2638 /* just to be safe */ 2639 if (m0->m_flags & M_DECRYPTED) 2640 goto noredhdropt; 2641 if (p - (u_char *)ip6 > maxlen) 2642 goto noredhdropt; 2643 2644 { 2645 /* redirected header option */ 2646 int len; 2647 struct nd_opt_rd_hdr *nd_opt_rh; 2648 2649 /* 2650 * compute the maximum size for icmp6 redirect header option. 2651 * XXX room for auth header? 2652 */ 2653 len = maxlen - (p - (u_char *)ip6); 2654 len &= ~7; 2655 2656 if (len < sizeof(*nd_opt_rh)) { 2657 goto noredhdropt; 2658 } 2659 2660 /* 2661 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2662 * about padding/truncate rule for the original IP packet. 2663 * From the discussion on IPv6imp in Feb 1999, 2664 * the consensus was: 2665 * - "attach as much as possible" is the goal 2666 * - pad if not aligned (original size can be guessed by 2667 * original ip6 header) 2668 * Following code adds the padding if it is simple enough, 2669 * and truncates if not. 2670 */ 2671 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2672 /* not enough room, truncate */ 2673 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2674 m0->m_pkthdr.len); 2675 } else { 2676 /* 2677 * enough room, truncate if not aligned. 2678 * we don't pad here for simplicity. 2679 */ 2680 int extra; 2681 2682 extra = m0->m_pkthdr.len % 8; 2683 if (extra) { 2684 /* truncate */ 2685 m_adj(m0, -extra); 2686 } 2687 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2688 } 2689 2690 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2691 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2692 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2693 nd_opt_rh->nd_opt_rh_len = len >> 3; 2694 p += sizeof(*nd_opt_rh); 2695 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2696 2697 /* connect m0 to m */ 2698 m->m_pkthdr.len += m0->m_pkthdr.len; 2699 m_cat(m, m0); 2700 m0 = NULL; 2701 } 2702 noredhdropt: 2703 if (m0) { 2704 m_freem(m0); 2705 m0 = NULL; 2706 } 2707 2708 /* XXX: clear embedded link IDs in the inner header */ 2709 in6_clearscope(&sip6->ip6_src); 2710 in6_clearscope(&sip6->ip6_dst); 2711 in6_clearscope(&nd_rd->nd_rd_target); 2712 in6_clearscope(&nd_rd->nd_rd_dst); 2713 2714 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2715 2716 nd_rd->nd_rd_cksum = 0; 2717 nd_rd->nd_rd_cksum = 2718 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2719 2720 /* send the packet to outside... */ 2721 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2722 icmp6_ifstat_inc(ifp, ifs6_out_error); 2723 2724 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2725 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2726 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2727 2728 return; 2729 2730 fail: 2731 if (m) 2732 m_freem(m); 2733 if (m0) 2734 m_freem(m0); 2735 } 2736 2737 /* 2738 * ICMPv6 socket option processing. 2739 */ 2740 int 2741 icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2742 { 2743 int error = 0; 2744 struct in6pcb *in6p = sotoin6pcb(so); 2745 2746 if (sopt->sopt_level != IPPROTO_ICMPV6) 2747 return rip6_ctloutput(op, so, sopt); 2748 2749 switch (op) { 2750 case PRCO_SETOPT: 2751 switch (sopt->sopt_name) { 2752 case ICMP6_FILTER: 2753 { 2754 struct icmp6_filter fil; 2755 2756 error = sockopt_get(sopt, &fil, sizeof(fil)); 2757 if (error) 2758 break; 2759 memcpy(in6p->in6p_icmp6filt, &fil, 2760 sizeof(struct icmp6_filter)); 2761 error = 0; 2762 break; 2763 } 2764 2765 default: 2766 error = ENOPROTOOPT; 2767 break; 2768 } 2769 break; 2770 2771 case PRCO_GETOPT: 2772 switch (sopt->sopt_name) { 2773 case ICMP6_FILTER: 2774 { 2775 if (in6p->in6p_icmp6filt == NULL) { 2776 error = EINVAL; 2777 break; 2778 } 2779 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2780 sizeof(struct icmp6_filter)); 2781 break; 2782 } 2783 2784 default: 2785 error = ENOPROTOOPT; 2786 break; 2787 } 2788 break; 2789 } 2790 2791 return error; 2792 } 2793 2794 /* 2795 * Perform rate limit check. 2796 * Returns 0 if it is okay to send the icmp6 packet. 2797 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2798 * limitation. 2799 * 2800 * XXX per-destination/type check necessary? 2801 */ 2802 static int 2803 icmp6_ratelimit( 2804 const struct in6_addr *dst, /* not used at this moment */ 2805 const int type, /* not used at this moment */ 2806 const int code) /* not used at this moment */ 2807 { 2808 int ret; 2809 2810 ret = 0; /* okay to send */ 2811 2812 /* PPS limit */ 2813 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2814 icmp6errppslim)) { 2815 /* The packet is subject to rate limit */ 2816 ret++; 2817 } 2818 2819 return ret; 2820 } 2821 2822 static struct rtentry * 2823 icmp6_mtudisc_clone(struct sockaddr *dst) 2824 { 2825 struct rtentry *rt; 2826 int error; 2827 2828 rt = rtalloc1(dst, 1); 2829 if (rt == NULL) 2830 return NULL; 2831 2832 /* If we didn't get a host route, allocate one */ 2833 if ((rt->rt_flags & RTF_HOST) == 0) { 2834 struct rtentry *nrt; 2835 2836 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2837 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2838 if (error) { 2839 rt_unref(rt); 2840 return NULL; 2841 } 2842 nrt->rt_rmx = rt->rt_rmx; 2843 rt_newmsg_dynamic(RTM_ADD, nrt); 2844 rt_unref(rt); 2845 rt = nrt; 2846 } 2847 2848 mutex_enter(&icmp6_mtx); 2849 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2850 icmp6_mtudisc_timeout_q); 2851 mutex_exit(&icmp6_mtx); 2852 2853 if (error) { 2854 rt_unref(rt); 2855 return NULL; 2856 } 2857 2858 return rt; /* caller need to call rtfree() */ 2859 } 2860 2861 static void 2862 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2863 { 2864 struct rtentry *retrt; 2865 2866 KASSERT(rt != NULL); 2867 rt_assert_referenced(rt); 2868 2869 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2870 (RTF_DYNAMIC | RTF_HOST)) { 2871 rtrequest(RTM_DELETE, rt_getkey(rt), 2872 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt); 2873 rt_newmsg_dynamic(RTM_DELETE, retrt); 2874 rt_unref(rt); 2875 rt_free(retrt); 2876 } else { 2877 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2878 rt->rt_rmx.rmx_mtu = 0; 2879 } 2880 } 2881 2882 static void 2883 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2884 { 2885 struct rtentry *retrt; 2886 2887 KASSERT(rt != NULL); 2888 rt_assert_referenced(rt); 2889 2890 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2891 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2892 rtrequest(RTM_DELETE, rt_getkey(rt), 2893 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt); 2894 rt_newmsg_dynamic(RTM_DELETE, retrt); 2895 rt_unref(rt); 2896 rt_free(retrt); 2897 } 2898 } 2899 2900 #ifdef COMPAT_90 2901 /* 2902 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2903 */ 2904 static int 2905 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2906 { 2907 (void)&name; 2908 (void)&l; 2909 (void)&oname; 2910 2911 if (namelen != 0) 2912 return (EINVAL); 2913 2914 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2915 /*XXXUNCONST*/ 2916 __UNCONST(newp), newlen)); 2917 } 2918 #endif 2919 2920 static int 2921 sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2922 { 2923 2924 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2925 } 2926 2927 static int 2928 sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2929 { 2930 int error, tmp; 2931 struct sysctlnode node; 2932 2933 mutex_enter(&icmp6_mtx); 2934 2935 node = *rnode; 2936 node.sysctl_data = &tmp; 2937 tmp = icmp6_redirtimeout; 2938 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2939 if (error || newp == NULL) 2940 goto out; 2941 if (tmp < 0) { 2942 error = EINVAL; 2943 goto out; 2944 } 2945 icmp6_redirtimeout = tmp; 2946 2947 if (icmp6_redirect_timeout_q != NULL) { 2948 if (icmp6_redirtimeout == 0) { 2949 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2950 } else { 2951 rt_timer_queue_change(icmp6_redirect_timeout_q, 2952 icmp6_redirtimeout); 2953 } 2954 } else if (icmp6_redirtimeout > 0) { 2955 icmp6_redirect_timeout_q = 2956 rt_timer_queue_create(icmp6_redirtimeout); 2957 } 2958 error = 0; 2959 out: 2960 mutex_exit(&icmp6_mtx); 2961 return error; 2962 } 2963 2964 static void 2965 sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2966 { 2967 2968 sysctl_createv(clog, 0, NULL, NULL, 2969 CTLFLAG_PERMANENT, 2970 CTLTYPE_NODE, "inet6", NULL, 2971 NULL, 0, NULL, 0, 2972 CTL_NET, PF_INET6, CTL_EOL); 2973 sysctl_createv(clog, 0, NULL, NULL, 2974 CTLFLAG_PERMANENT, 2975 CTLTYPE_NODE, "icmp6", 2976 SYSCTL_DESCR("ICMPv6 related settings"), 2977 NULL, 0, NULL, 0, 2978 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2979 2980 sysctl_createv(clog, 0, NULL, NULL, 2981 CTLFLAG_PERMANENT, 2982 CTLTYPE_STRUCT, "stats", 2983 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2984 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2985 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2986 ICMPV6CTL_STATS, CTL_EOL); 2987 sysctl_createv(clog, 0, NULL, NULL, 2988 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2989 CTLTYPE_INT, "rediraccept", 2990 SYSCTL_DESCR("Accept and process redirect messages"), 2991 NULL, 0, &icmp6_rediraccept, 0, 2992 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2993 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2994 sysctl_createv(clog, 0, NULL, NULL, 2995 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2996 CTLTYPE_INT, "redirtimeout", 2997 SYSCTL_DESCR("Redirect generated route lifetime"), 2998 sysctl_net_inet6_icmp6_redirtimeout, 0, 2999 &icmp6_redirtimeout, 0, 3000 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3001 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 3002 #if 0 /* obsoleted */ 3003 sysctl_createv(clog, 0, NULL, NULL, 3004 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3005 CTLTYPE_INT, "errratelimit", NULL, 3006 NULL, 0, &icmp6_errratelimit, 0, 3007 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3008 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 3009 #endif 3010 sysctl_createv(clog, 0, NULL, NULL, 3011 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3012 CTLTYPE_INT, "nd6_prune", 3013 SYSCTL_DESCR("Neighbor discovery prune interval"), 3014 NULL, 0, &nd6_prune, 0, 3015 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3016 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 3017 sysctl_createv(clog, 0, NULL, NULL, 3018 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3019 CTLTYPE_INT, "nd6_delay", 3020 SYSCTL_DESCR("First probe delay time"), 3021 NULL, 0, &nd6_nd_domain.nd_delay, 0, 3022 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3023 ICMPV6CTL_ND6_DELAY, CTL_EOL); 3024 sysctl_createv(clog, 0, NULL, NULL, 3025 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3026 CTLTYPE_INT, "nd6_mmaxtries", 3027 SYSCTL_DESCR("Number of multicast discovery attempts"), 3028 NULL, 0, &nd6_nd_domain.nd_mmaxtries, 0, 3029 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3030 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 3031 sysctl_createv(clog, 0, NULL, NULL, 3032 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3033 CTLTYPE_INT, "nd6_umaxtries", 3034 SYSCTL_DESCR("Number of unicast discovery attempts"), 3035 NULL, 0, &nd6_nd_domain.nd_umaxtries, 0, 3036 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3037 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 3038 sysctl_createv(clog, 0, NULL, NULL, 3039 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3040 CTLTYPE_INT, "nd6_maxnudhint", 3041 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 3042 NULL, 0, &nd6_nd_domain.nd_maxnudhint, 0, 3043 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3044 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 3045 sysctl_createv(clog, 0, NULL, NULL, 3046 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3047 CTLTYPE_INT, "maxqueuelen", 3048 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3049 NULL, 1, &nd6_nd_domain.nd_maxqueuelen, 0, 3050 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3051 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3052 sysctl_createv(clog, 0, NULL, NULL, 3053 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3054 CTLTYPE_INT, "nd6_useloopback", 3055 SYSCTL_DESCR("Use loopback interface for local traffic"), 3056 NULL, 0, &nd6_useloopback, 0, 3057 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3058 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 3059 #if 0 /* obsoleted */ 3060 sysctl_createv(clog, 0, NULL, NULL, 3061 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3062 CTLTYPE_INT, "nd6_proxyall", NULL, 3063 NULL, 0, &nd6_proxyall, 0, 3064 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3065 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 3066 #endif 3067 sysctl_createv(clog, 0, NULL, NULL, 3068 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3069 CTLTYPE_INT, "nodeinfo", 3070 SYSCTL_DESCR("Respond to node information requests"), 3071 NULL, 0, &icmp6_nodeinfo, 0, 3072 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3073 ICMPV6CTL_NODEINFO, CTL_EOL); 3074 sysctl_createv(clog, 0, NULL, NULL, 3075 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3076 CTLTYPE_INT, "errppslimit", 3077 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 3078 NULL, 0, &icmp6errppslim, 0, 3079 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3080 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 3081 sysctl_createv(clog, 0, NULL, NULL, 3082 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3083 CTLTYPE_INT, "mtudisc_hiwat", 3084 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3085 NULL, 0, &icmp6_mtudisc_hiwat, 0, 3086 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3087 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 3088 sysctl_createv(clog, 0, NULL, NULL, 3089 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3090 CTLTYPE_INT, "mtudisc_lowat", 3091 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3092 NULL, 0, &icmp6_mtudisc_lowat, 0, 3093 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3094 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 3095 sysctl_createv(clog, 0, NULL, NULL, 3096 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3097 CTLTYPE_INT, "nd6_debug", 3098 SYSCTL_DESCR("Enable neighbor discovery debug output"), 3099 NULL, 0, &nd6_debug, 0, 3100 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3101 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 3102 #ifdef COMPAT_90 3103 sysctl_createv(clog, 0, NULL, NULL, 3104 CTLFLAG_PERMANENT, 3105 CTLTYPE_STRUCT, "nd6_drlist", 3106 SYSCTL_DESCR("Default router list"), 3107 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3108 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3109 OICMPV6CTL_ND6_DRLIST, CTL_EOL); 3110 sysctl_createv(clog, 0, NULL, NULL, 3111 CTLFLAG_PERMANENT, 3112 CTLTYPE_STRUCT, "nd6_prlist", 3113 SYSCTL_DESCR("Prefix list"), 3114 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3115 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3116 OICMPV6CTL_ND6_PRLIST, CTL_EOL); 3117 #endif 3118 sysctl_createv(clog, 0, NULL, NULL, 3119 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3120 CTLTYPE_BOOL, "reflect_pmtu", 3121 SYSCTL_DESCR("Use path MTU Discovery for icmpv6 reflect"), 3122 NULL, 0, &icmp6_reflect_pmtu, 0, 3123 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3124 ICMPV6CTL_REFLECT_PMTU, CTL_EOL); 3125 sysctl_createv(clog, 0, NULL, NULL, 3126 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3127 CTLTYPE_BOOL, "dynamic_rt_msg", 3128 SYSCTL_DESCR("Send routing message for RTF_DYNAMIC"), 3129 NULL, 0, &icmp6_dynamic_rt_msg, 0, 3130 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3131 ICMPV6CTL_DYNAMIC_RT_MSG, CTL_EOL); 3132 } 3133 3134 void 3135 icmp6_statinc(u_int stat) 3136 { 3137 3138 KASSERT(stat < ICMP6_NSTATS); 3139 ICMP6_STATINC(stat); 3140 } 3141