1 /* $NetBSD: icmp6.c,v 1.250 2021/02/19 14:52:00 christos 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 1.250 2021/02/19 14:52:00 christos 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 /* 155 * List of callbacks to notify when Path MTU changes are made. 156 */ 157 struct icmp6_mtudisc_callback { 158 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 159 void (*mc_func)(struct in6_addr *); 160 }; 161 162 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 163 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 164 165 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 166 extern int pmtu_expire; 167 168 /* XXX do these values make any sense? */ 169 static int icmp6_mtudisc_hiwat = 1280; 170 static int icmp6_mtudisc_lowat = 256; 171 172 /* 173 * keep track of # of redirect routes. 174 */ 175 static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 176 177 /* XXX experimental, turned off */ 178 static int icmp6_redirect_hiwat = -1; 179 static int icmp6_redirect_lowat = -1; 180 181 /* Protect mtudisc and redirect stuffs */ 182 static kmutex_t icmp6_mtx __cacheline_aligned; 183 184 static void icmp6_errcount(u_int, int, int); 185 static int icmp6_rip6_input(struct mbuf **, int); 186 static void icmp6_reflect(struct mbuf *, size_t); 187 static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 188 static const char *icmp6_redirect_diag(char *, size_t, struct in6_addr *, 189 struct in6_addr *, struct in6_addr *); 190 static void icmp6_redirect_input(struct mbuf *, int); 191 static struct mbuf *ni6_input(struct mbuf *, int); 192 static struct mbuf *ni6_nametodns(const char *, int, int); 193 static int ni6_dnsmatch(const char *, int, const char *, int); 194 static int ni6_addrs(struct icmp6_nodeinfo *, struct ifnet **, char *, 195 struct psref *); 196 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 197 struct ifnet *, int); 198 static int icmp6_notify_error(struct mbuf *, int, int, int); 199 static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 200 static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 201 static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 202 static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 203 204 /* workqueue-based pr_input */ 205 static struct wqinput *icmp6_wqinput; 206 static void _icmp6_input(struct mbuf *m, int off, int proto); 207 208 void 209 icmp6_init(void) 210 { 211 212 sysctl_net_inet6_icmp6_setup(NULL); 213 mld_init(); 214 215 mutex_init(&icmp6_mtx, MUTEX_DEFAULT, IPL_NONE); 216 mutex_enter(&icmp6_mtx); 217 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 218 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 219 mutex_exit(&icmp6_mtx); 220 221 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS); 222 223 icmp6_wqinput = wqinput_create("icmp6", _icmp6_input); 224 } 225 226 static void 227 icmp6_errcount(u_int base, int type, int code) 228 { 229 switch (type) { 230 case ICMP6_DST_UNREACH: 231 switch (code) { 232 case ICMP6_DST_UNREACH_NOROUTE: 233 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE); 234 return; 235 case ICMP6_DST_UNREACH_ADMIN: 236 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN); 237 return; 238 case ICMP6_DST_UNREACH_BEYONDSCOPE: 239 ICMP6_STATINC(base + 240 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE); 241 return; 242 case ICMP6_DST_UNREACH_ADDR: 243 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR); 244 return; 245 case ICMP6_DST_UNREACH_NOPORT: 246 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT); 247 return; 248 } 249 break; 250 case ICMP6_PACKET_TOO_BIG: 251 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG); 252 return; 253 case ICMP6_TIME_EXCEEDED: 254 switch (code) { 255 case ICMP6_TIME_EXCEED_TRANSIT: 256 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT); 257 return; 258 case ICMP6_TIME_EXCEED_REASSEMBLY: 259 ICMP6_STATINC(base + 260 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY); 261 return; 262 } 263 break; 264 case ICMP6_PARAM_PROB: 265 switch (code) { 266 case ICMP6_PARAMPROB_HEADER: 267 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER); 268 return; 269 case ICMP6_PARAMPROB_NEXTHEADER: 270 ICMP6_STATINC(base + 271 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER); 272 return; 273 case ICMP6_PARAMPROB_OPTION: 274 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION); 275 return; 276 } 277 break; 278 case ND_REDIRECT: 279 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT); 280 return; 281 } 282 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN); 283 } 284 285 /* 286 * Register a Path MTU Discovery callback. 287 */ 288 void 289 icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *)) 290 { 291 struct icmp6_mtudisc_callback *mc, *new; 292 293 new = kmem_alloc(sizeof(*mc), KM_SLEEP); 294 295 mutex_enter(&icmp6_mtx); 296 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 297 mc = LIST_NEXT(mc, mc_list)) { 298 if (mc->mc_func == func) { 299 mutex_exit(&icmp6_mtx); 300 kmem_free(new, sizeof(*mc)); 301 return; 302 } 303 } 304 305 new->mc_func = func; 306 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, new, mc_list); 307 mutex_exit(&icmp6_mtx); 308 } 309 310 /* 311 * A wrapper function for icmp6_error() necessary when the erroneous packet 312 * may not contain enough scope zone information. 313 */ 314 void 315 icmp6_error2(struct mbuf *m, int type, int code, int param, 316 struct ifnet *ifp, struct in6_addr *src) 317 { 318 struct ip6_hdr *ip6; 319 320 KASSERT(ifp != NULL); 321 322 if (m->m_len < sizeof(struct ip6_hdr)) { 323 m = m_pullup(m, sizeof(struct ip6_hdr)); 324 if (m == NULL) 325 return; 326 } 327 328 ip6 = mtod(m, struct ip6_hdr *); 329 330 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 331 goto out; 332 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 333 goto out; 334 335 *src = ip6->ip6_src; 336 icmp6_error(m, type, code, param); 337 return; 338 339 out: 340 m_freem(m); 341 } 342 343 /* 344 * Generate an error packet of type error in response to bad IP6 packet. 345 */ 346 void 347 icmp6_error(struct mbuf *m, int type, int code, int param) 348 { 349 struct ip6_hdr *oip6, *nip6; 350 struct icmp6_hdr *icmp6; 351 u_int preplen; 352 int off; 353 int nxt; 354 355 ICMP6_STATINC(ICMP6_STAT_ERROR); 356 357 /* count per-type-code statistics */ 358 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); 359 360 if (m->m_flags & M_DECRYPTED) { 361 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 362 goto freeit; 363 } 364 365 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && 366 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) 367 return; 368 oip6 = mtod(m, struct ip6_hdr *); 369 370 /* 371 * If the destination address of the erroneous packet is a multicast 372 * address, or the packet was sent using link-layer multicast, 373 * we should basically suppress sending an error (RFC 2463, Section 374 * 2.4). 375 * We have two exceptions (the item e.2 in that section): 376 * - the Packet Too Big message can be sent for path MTU discovery. 377 * - the Parameter Problem Message that can be allowed an icmp6 error 378 * in the option type field. This check has been done in 379 * ip6_unknown_opt(), so we can just check the type and code. 380 */ 381 if ((m->m_flags & (M_BCAST|M_MCAST) || 382 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 383 (type != ICMP6_PACKET_TOO_BIG && 384 (type != ICMP6_PARAM_PROB || 385 code != ICMP6_PARAMPROB_OPTION))) 386 goto freeit; 387 388 /* 389 * RFC 2463, 2.4 (e.5): source address check. 390 * XXX: the case of anycast source? 391 */ 392 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 393 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 394 goto freeit; 395 396 /* 397 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 398 * don't do it. 399 */ 400 nxt = -1; 401 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 402 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 403 struct icmp6_hdr *icp; 404 405 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 406 sizeof(*icp)); 407 if (icp == NULL) { 408 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 409 return; 410 } 411 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 412 icp->icmp6_type == ND_REDIRECT) { 413 /* 414 * ICMPv6 error 415 * Special case: for redirect (which is 416 * informational) we must not send icmp6 error. 417 */ 418 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 419 goto freeit; 420 } else { 421 /* ICMPv6 informational - send the error */ 422 } 423 } else { 424 /* non-ICMPv6 - send the error */ 425 } 426 427 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 428 429 /* Finally, do rate limitation check. */ 430 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 431 ICMP6_STATINC(ICMP6_STAT_TOOFREQ); 432 goto freeit; 433 } 434 435 /* 436 * OK, ICMP6 can be generated. 437 */ 438 439 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 440 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 441 442 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 443 M_PREPEND(m, preplen, M_DONTWAIT); 444 if (m && M_UNWRITABLE(m, preplen)) 445 m = m_pullup(m, preplen); 446 if (m == NULL) { 447 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__); 448 return; 449 } 450 451 nip6 = mtod(m, struct ip6_hdr *); 452 nip6->ip6_src = oip6->ip6_src; 453 nip6->ip6_dst = oip6->ip6_dst; 454 455 in6_clearscope(&oip6->ip6_src); 456 in6_clearscope(&oip6->ip6_dst); 457 458 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 459 icmp6->icmp6_type = type; 460 icmp6->icmp6_code = code; 461 icmp6->icmp6_pptr = htonl((u_int32_t)param); 462 463 /* 464 * icmp6_reflect() is designed to be in the input path. 465 * icmp6_error() can be called from both input and output path, 466 * and if we are in output path rcvif could contain bogus value. 467 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 468 * information in ip header (nip6). 469 */ 470 m_reset_rcvif(m); 471 472 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 473 474 /* header order: IPv6 - ICMPv6 */ 475 icmp6_reflect(m, sizeof(struct ip6_hdr)); 476 477 return; 478 479 freeit: 480 /* 481 * If we can't tell whether or not we can generate ICMP6, free it. 482 */ 483 m_freem(m); 484 } 485 486 /* 487 * Process a received ICMP6 message. 488 */ 489 static void 490 _icmp6_input(struct mbuf *m, int off, int proto) 491 { 492 struct mbuf *n; 493 struct ip6_hdr *ip6, *nip6; 494 struct icmp6_hdr *icmp6, *nicmp6; 495 int icmp6len = m->m_pkthdr.len - off; 496 int code, sum; 497 struct ifnet *rcvif; 498 struct psref psref; 499 char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN]; 500 501 rcvif = m_get_rcvif_psref(m, &psref); 502 if (__predict_false(rcvif == NULL)) 503 goto freeit; 504 505 #define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 506 KASSERT(ICMP6_MAXLEN < MCLBYTES); 507 icmp6_ifstat_inc(rcvif, ifs6_in_msg); 508 509 /* 510 * Locate icmp6 structure in mbuf, and check 511 * that not corrupted and of at least minimum length 512 */ 513 514 if (icmp6len < sizeof(struct icmp6_hdr)) { 515 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 516 icmp6_ifstat_inc(rcvif, ifs6_in_error); 517 goto freeit; 518 } 519 520 if (m->m_len < sizeof(struct ip6_hdr)) { 521 m = m_pullup(m, sizeof(struct ip6_hdr)); 522 if (m == NULL) { 523 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 524 icmp6_ifstat_inc(rcvif, ifs6_in_error); 525 goto freeit; 526 } 527 } 528 529 ip6 = mtod(m, struct ip6_hdr *); 530 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 531 if (icmp6 == NULL) { 532 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 533 icmp6_ifstat_inc(rcvif, ifs6_in_error); 534 goto freeit; 535 } 536 537 /* 538 * Enforce alignment requirements that are violated in 539 * some cases, see kern/50766 for details. 540 */ 541 if (ACCESSIBLE_POINTER(icmp6, struct ip6_hdr) == 0) { 542 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0); 543 if (m == NULL) { 544 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 545 icmp6_ifstat_inc(rcvif, ifs6_in_error); 546 goto freeit; 547 } 548 ip6 = mtod(m, struct ip6_hdr *); 549 icmp6 = (struct icmp6_hdr *)(mtod(m, char *) + off); 550 } 551 KASSERT(ACCESSIBLE_POINTER(icmp6, struct ip6_hdr)); 552 553 /* 554 * calculate the checksum 555 */ 556 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 557 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 558 icmp6->icmp6_type, sum, IN6_PRINT(ip6buf, &ip6->ip6_src)); 559 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 560 icmp6_ifstat_inc(rcvif, ifs6_in_error); 561 goto freeit; 562 } 563 564 #if defined(NFAITH) && 0 < NFAITH 565 if (faithprefix(&ip6->ip6_dst)) { 566 /* 567 * Deliver very specific ICMP6 type only. 568 * This is important to deliver TOOBIG. Otherwise PMTUD 569 * will not work. 570 */ 571 switch (icmp6->icmp6_type) { 572 case ICMP6_DST_UNREACH: 573 case ICMP6_PACKET_TOO_BIG: 574 case ICMP6_TIME_EXCEEDED: 575 break; 576 default: 577 goto freeit; 578 } 579 } 580 #endif 581 582 code = icmp6->icmp6_code; 583 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 584 585 switch (icmp6->icmp6_type) { 586 case ICMP6_DST_UNREACH: 587 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 588 switch (code) { 589 case ICMP6_DST_UNREACH_NOROUTE: 590 code = PRC_UNREACH_NET; 591 break; 592 case ICMP6_DST_UNREACH_ADMIN: 593 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 594 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 595 break; 596 case ICMP6_DST_UNREACH_ADDR: 597 code = PRC_HOSTDEAD; 598 break; 599 case ICMP6_DST_UNREACH_BEYONDSCOPE: 600 /* I mean "source address was incorrect." */ 601 code = PRC_UNREACH_NET; 602 break; 603 case ICMP6_DST_UNREACH_NOPORT: 604 code = PRC_UNREACH_PORT; 605 break; 606 default: 607 goto badcode; 608 } 609 goto deliver; 610 611 case ICMP6_PACKET_TOO_BIG: 612 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 613 614 /* 615 * MTU is checked in icmp6_mtudisc. 616 */ 617 code = PRC_MSGSIZE; 618 619 /* 620 * Updating the path MTU will be done after examining 621 * intermediate extension headers. 622 */ 623 goto deliver; 624 625 case ICMP6_TIME_EXCEEDED: 626 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 627 switch (code) { 628 case ICMP6_TIME_EXCEED_TRANSIT: 629 code = PRC_TIMXCEED_INTRANS; 630 break; 631 case ICMP6_TIME_EXCEED_REASSEMBLY: 632 code = PRC_TIMXCEED_REASS; 633 break; 634 default: 635 goto badcode; 636 } 637 goto deliver; 638 639 case ICMP6_PARAM_PROB: 640 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 641 switch (code) { 642 case ICMP6_PARAMPROB_NEXTHEADER: 643 code = PRC_UNREACH_PROTOCOL; 644 break; 645 case ICMP6_PARAMPROB_HEADER: 646 case ICMP6_PARAMPROB_OPTION: 647 code = PRC_PARAMPROB; 648 break; 649 default: 650 goto badcode; 651 } 652 goto deliver; 653 654 case ICMP6_ECHO_REQUEST: 655 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 656 if (code != 0) 657 goto badcode; 658 /* 659 * Copy mbuf to send to two data paths: userland socket(s), 660 * and to the querier (echo reply). 661 * m: a copy for socket, n: a copy for querier 662 * 663 * If the first mbuf is shared, or the first mbuf is too short, 664 * copy the first part of the data into a fresh mbuf. 665 * Otherwise, we will wrongly overwrite both copies. 666 */ 667 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 668 /* Give up local */ 669 n = m; 670 m = NULL; 671 } else if (M_UNWRITABLE(n, off + sizeof(struct icmp6_hdr))) { 672 struct mbuf *n0 = n; 673 674 /* 675 * Prepare an internal mbuf. m_pullup() doesn't 676 * always copy the length we specified. 677 */ 678 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 679 /* Give up local */ 680 n = m; 681 m = NULL; 682 } 683 m_freem(n0); 684 } 685 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 686 sizeof(*nicmp6)); 687 if (nicmp6 == NULL) 688 goto freeit; 689 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 690 nicmp6->icmp6_code = 0; 691 if (n) { 692 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 693 icmp6s[ICMP6_STAT_REFLECT]++; 694 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 695 ICMP6_STAT_PUTREF(); 696 icmp6_reflect(n, off); 697 } 698 if (!m) 699 goto freeit; 700 break; 701 702 case ICMP6_ECHO_REPLY: 703 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 704 if (code != 0) 705 goto badcode; 706 break; 707 708 case MLD_LISTENER_QUERY: 709 case MLD_LISTENER_REPORT: 710 if (icmp6len < sizeof(struct mld_hdr)) 711 goto badlen; 712 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 713 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 714 else 715 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 716 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 717 /* give up local */ 718 mld_input(m, off); 719 m = NULL; 720 goto freeit; 721 } 722 mld_input(n, off); 723 /* m stays. */ 724 break; 725 726 case MLD_LISTENER_DONE: 727 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 728 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 729 goto badlen; 730 break; /* nothing to be done in kernel */ 731 732 case MLD_MTRACE_RESP: 733 case MLD_MTRACE: 734 /* XXX: these two are experimental. not officially defined. */ 735 /* XXX: per-interface statistics? */ 736 break; /* just pass it to applications */ 737 738 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 739 { 740 enum { WRU, FQDN } mode; 741 742 if (!icmp6_nodeinfo) 743 break; 744 745 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 746 mode = WRU; 747 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 748 mode = FQDN; 749 else 750 goto badlen; 751 752 if (mode == FQDN) { 753 n = m_copypacket(m, M_DONTWAIT); 754 if (n) 755 n = ni6_input(n, off); 756 } else { 757 u_char *p; 758 int maxhlen; 759 760 if ((icmp6_nodeinfo & 5) != 5) 761 break; 762 763 if (code != 0) 764 goto badcode; 765 MGETHDR(n, M_DONTWAIT, m->m_type); 766 if (n && ICMP6_MAXLEN > MHLEN) { 767 MCLGET(n, M_DONTWAIT); 768 if ((n->m_flags & M_EXT) == 0) { 769 m_free(n); 770 n = NULL; 771 } 772 } 773 if (n == NULL) { 774 /* Give up remote */ 775 break; 776 } 777 m_reset_rcvif(n); 778 n->m_len = 0; 779 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 780 if (maxhlen < 0) { 781 m_free(n); 782 break; 783 } 784 if (maxhlen > hostnamelen) 785 maxhlen = hostnamelen; 786 /* 787 * Copy IPv6 and ICMPv6 only. 788 */ 789 nip6 = mtod(n, struct ip6_hdr *); 790 memcpy(nip6, ip6, sizeof(struct ip6_hdr)); 791 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 792 memcpy(nicmp6, icmp6, sizeof(struct icmp6_hdr)); 793 794 p = (u_char *)(nicmp6 + 1); 795 memset(p, 0, 4); 796 memcpy(p + 4, hostname, maxhlen); /* meaningless TTL */ 797 798 m_copy_pkthdr(n, m); 799 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 800 sizeof(struct icmp6_hdr) + 4 + maxhlen; 801 nicmp6->icmp6_type = ICMP6_WRUREPLY; 802 nicmp6->icmp6_code = 0; 803 } 804 if (n) { 805 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 806 icmp6s[ICMP6_STAT_REFLECT]++; 807 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 808 ICMP6_STAT_PUTREF(); 809 icmp6_reflect(n, sizeof(struct ip6_hdr)); 810 } 811 break; 812 } 813 814 case ICMP6_WRUREPLY: 815 if (code != 0) 816 goto badcode; 817 break; 818 819 case ND_ROUTER_SOLICIT: 820 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 821 /* FALLTHROUGH */ 822 case ND_ROUTER_ADVERT: 823 if (icmp6->icmp6_type == ND_ROUTER_ADVERT) 824 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 825 if (code != 0) 826 goto badcode; 827 if ((icmp6->icmp6_type == ND_ROUTER_SOLICIT && 828 icmp6len < sizeof(struct nd_router_solicit)) || 829 (icmp6->icmp6_type == ND_ROUTER_ADVERT && 830 icmp6len < sizeof(struct nd_router_advert))) 831 goto badlen; 832 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 833 /* give up local */ 834 nd6_rtr_cache(m, off, icmp6len, icmp6->icmp6_type); 835 m = NULL; 836 goto freeit; 837 } 838 nd6_rtr_cache(n, off, icmp6len, icmp6->icmp6_type); 839 /* m stays. */ 840 break; 841 842 case ND_NEIGHBOR_SOLICIT: 843 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 844 if (code != 0) 845 goto badcode; 846 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 847 goto badlen; 848 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 849 /* give up local */ 850 nd6_ns_input(m, off, icmp6len); 851 m = NULL; 852 goto freeit; 853 } 854 nd6_ns_input(n, off, icmp6len); 855 /* m stays. */ 856 break; 857 858 case ND_NEIGHBOR_ADVERT: 859 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 860 if (code != 0) 861 goto badcode; 862 if (icmp6len < sizeof(struct nd_neighbor_advert)) 863 goto badlen; 864 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 865 /* give up local */ 866 nd6_na_input(m, off, icmp6len); 867 m = NULL; 868 goto freeit; 869 } 870 nd6_na_input(n, off, icmp6len); 871 /* m stays. */ 872 break; 873 874 case ND_REDIRECT: 875 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 876 if (code != 0) 877 goto badcode; 878 if (icmp6len < sizeof(struct nd_redirect)) 879 goto badlen; 880 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 881 /* give up local */ 882 icmp6_redirect_input(m, off); 883 m = NULL; 884 goto freeit; 885 } 886 icmp6_redirect_input(n, off); 887 /* m stays. */ 888 break; 889 890 case ICMP6_ROUTER_RENUMBERING: 891 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 892 code != ICMP6_ROUTER_RENUMBERING_RESULT) 893 goto badcode; 894 if (icmp6len < sizeof(struct icmp6_router_renum)) 895 goto badlen; 896 break; 897 898 default: 899 nd6log(LOG_DEBUG, 900 "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 901 icmp6->icmp6_type, 902 IN6_PRINT(ip6buf, &ip6->ip6_src), 903 IN6_PRINT(ip6buf2, &ip6->ip6_dst), 904 rcvif ? rcvif->if_index : 0); 905 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 906 /* ICMPv6 error: MUST deliver it by spec... */ 907 code = PRC_NCMDS; 908 /* deliver */ 909 } else { 910 /* ICMPv6 informational: MUST not deliver */ 911 break; 912 } 913 deliver: 914 if (icmp6_notify_error(m, off, icmp6len, code)) { 915 /* In this case, m should've been freed. */ 916 m_put_rcvif_psref(rcvif, &psref); 917 return; 918 } 919 break; 920 921 badcode: 922 ICMP6_STATINC(ICMP6_STAT_BADCODE); 923 break; 924 925 badlen: 926 ICMP6_STATINC(ICMP6_STAT_BADLEN); 927 break; 928 } 929 m_put_rcvif_psref(rcvif, &psref); 930 931 /* deliver the packet to appropriate sockets */ 932 icmp6_rip6_input(&m, off); 933 934 return; 935 936 freeit: 937 m_put_rcvif_psref(rcvif, &psref); 938 m_freem(m); 939 return; 940 } 941 942 int 943 icmp6_input(struct mbuf **mp, int *offp, int proto) 944 { 945 946 wqinput_input(icmp6_wqinput, *mp, *offp, proto); 947 948 return IPPROTO_DONE; 949 } 950 951 static int 952 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 953 { 954 struct icmp6_hdr *icmp6; 955 struct ip6_hdr *eip6; 956 u_int32_t notifymtu; 957 struct sockaddr_in6 icmp6src, icmp6dst; 958 959 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 960 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 961 goto freeit; 962 } 963 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 964 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 965 if (icmp6 == NULL) { 966 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 967 return (-1); 968 } 969 eip6 = (struct ip6_hdr *)(icmp6 + 1); 970 971 /* Detect the upper level protocol */ 972 { 973 void *(*ctlfunc)(int, const struct sockaddr *, void *); 974 u_int8_t nxt = eip6->ip6_nxt; 975 int eoff = off + sizeof(struct icmp6_hdr) + 976 sizeof(struct ip6_hdr); 977 struct ip6ctlparam ip6cp; 978 struct in6_addr *finaldst = NULL; 979 int icmp6type = icmp6->icmp6_type; 980 struct ip6_frag *fh; 981 struct ip6_rthdr *rth; 982 struct ifnet *rcvif; 983 int s; 984 985 while (1) { /* XXX: should avoid infinite loop explicitly? */ 986 struct ip6_ext *eh; 987 988 switch (nxt) { 989 case IPPROTO_HOPOPTS: 990 case IPPROTO_DSTOPTS: 991 case IPPROTO_AH: 992 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 993 eoff, sizeof(*eh)); 994 if (eh == NULL) { 995 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 996 return (-1); 997 } 998 999 if (nxt == IPPROTO_AH) 1000 eoff += (eh->ip6e_len + 2) << 2; 1001 else 1002 eoff += (eh->ip6e_len + 1) << 3; 1003 nxt = eh->ip6e_nxt; 1004 break; 1005 case IPPROTO_ROUTING: 1006 /* Ignore the option. */ 1007 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 1008 eoff, sizeof(*rth)); 1009 if (rth == NULL) { 1010 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1011 return (-1); 1012 } 1013 1014 eoff += (rth->ip6r_len + 1) << 3; 1015 nxt = rth->ip6r_nxt; 1016 break; 1017 case IPPROTO_FRAGMENT: 1018 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1019 eoff, sizeof(*fh)); 1020 if (fh == NULL) { 1021 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1022 return (-1); 1023 } 1024 /* 1025 * Data after a fragment header is meaningless 1026 * unless it is the first fragment, but 1027 * we'll go to the notify label for path MTU 1028 * discovery. 1029 */ 1030 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1031 goto notify; 1032 1033 eoff += sizeof(struct ip6_frag); 1034 nxt = fh->ip6f_nxt; 1035 break; 1036 default: 1037 /* 1038 * This case includes ESP and the No Next 1039 * Header. In such cases going to the notify 1040 * label does not have any meaning 1041 * (i.e. ctlfunc will be NULL), but we go 1042 * anyway since we might have to update 1043 * path MTU information. 1044 */ 1045 goto notify; 1046 } 1047 } 1048 notify: 1049 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1050 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1051 if (icmp6 == NULL) { 1052 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1053 return (-1); 1054 } 1055 1056 /* 1057 * retrieve parameters from the inner IPv6 header, and convert 1058 * them into sockaddr structures. 1059 * XXX: there is no guarantee that the source or destination 1060 * addresses of the inner packet are in the same scope zone as 1061 * the addresses of the icmp packet. But there is no other 1062 * way to determine the zone. 1063 */ 1064 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1065 1066 rcvif = m_get_rcvif(m, &s); 1067 if (__predict_false(rcvif == NULL)) 1068 goto freeit; 1069 sockaddr_in6_init(&icmp6dst, 1070 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1071 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1072 m_put_rcvif(rcvif, &s); 1073 goto freeit; 1074 } 1075 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1076 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1077 m_put_rcvif(rcvif, &s); 1078 goto freeit; 1079 } 1080 m_put_rcvif(rcvif, &s); 1081 1082 icmp6src.sin6_flowinfo = 1083 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1084 1085 if (finaldst == NULL) 1086 finaldst = &eip6->ip6_dst; 1087 ip6cp.ip6c_m = m; 1088 ip6cp.ip6c_icmp6 = icmp6; 1089 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1090 ip6cp.ip6c_off = eoff; 1091 ip6cp.ip6c_finaldst = finaldst; 1092 ip6cp.ip6c_src = &icmp6src; 1093 ip6cp.ip6c_nxt = nxt; 1094 1095 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1096 notifymtu = ntohl(icmp6->icmp6_mtu); 1097 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1098 } 1099 1100 ctlfunc = inet6sw[ip6_protox[nxt]].pr_ctlinput; 1101 if (ctlfunc) { 1102 (void)(*ctlfunc)(code, sin6tosa(&icmp6dst), &ip6cp); 1103 } 1104 } 1105 return (0); 1106 1107 freeit: 1108 m_freem(m); 1109 return (-1); 1110 } 1111 1112 void 1113 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1114 { 1115 unsigned long rtcount; 1116 struct icmp6_mtudisc_callback *mc; 1117 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1118 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1119 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1120 u_int mtu = ntohl(icmp6->icmp6_mtu); 1121 struct rtentry *rt = NULL; 1122 struct sockaddr_in6 sin6; 1123 struct ifnet *rcvif; 1124 int s; 1125 1126 /* 1127 * The MTU should not be less than the minimal IPv6 MTU except for the 1128 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1129 * In that one case, the MTU might be less than 1280. 1130 */ 1131 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1132 /* is the mtu even sane? */ 1133 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1134 return; 1135 if (!validated) 1136 return; 1137 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1138 } 1139 1140 /* 1141 * allow non-validated cases if memory is plenty, to make traffic 1142 * from non-connected pcb happy. 1143 */ 1144 mutex_enter(&icmp6_mtx); 1145 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1146 if (validated) { 1147 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) { 1148 mutex_exit(&icmp6_mtx); 1149 return; 1150 } else if (0 <= icmp6_mtudisc_lowat && 1151 rtcount > icmp6_mtudisc_lowat) { 1152 /* 1153 * XXX nuke a victim, install the new one. 1154 */ 1155 } 1156 } else { 1157 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) { 1158 mutex_exit(&icmp6_mtx); 1159 return; 1160 } 1161 } 1162 mutex_exit(&icmp6_mtx); 1163 1164 memset(&sin6, 0, sizeof(sin6)); 1165 sin6.sin6_family = PF_INET6; 1166 sin6.sin6_len = sizeof(struct sockaddr_in6); 1167 sin6.sin6_addr = *dst; 1168 rcvif = m_get_rcvif(m, &s); 1169 if (__predict_false(rcvif == NULL)) 1170 return; 1171 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1172 m_put_rcvif(rcvif, &s); 1173 return; 1174 } 1175 m_put_rcvif(rcvif, &s); 1176 1177 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1178 1179 if (rt && (rt->rt_flags & RTF_HOST) && 1180 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1181 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1182 if (mtu < rt->rt_ifp->if_mtu) { 1183 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1184 rt->rt_rmx.rmx_mtu = mtu; 1185 } 1186 } 1187 if (rt) { 1188 rt_unref(rt); 1189 } 1190 1191 /* 1192 * Notify protocols that the MTU for this destination 1193 * has changed. 1194 */ 1195 mutex_enter(&icmp6_mtx); 1196 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1197 mc = LIST_NEXT(mc, mc_list)) 1198 (*mc->mc_func)(&sin6.sin6_addr); 1199 mutex_exit(&icmp6_mtx); 1200 } 1201 1202 /* 1203 * Process a Node Information Query packet, based on 1204 * draft-ietf-ipngwg-icmp-name-lookups-07. 1205 * 1206 * Spec incompatibilities: 1207 * - IPv6 Subject address handling 1208 * - IPv4 Subject address handling support missing 1209 * - Proxy reply (answer even if it's not for me) 1210 * - joins NI group address at in6_ifattach() time only, does not cope 1211 * with hostname changes by sethostname(3) 1212 */ 1213 static struct mbuf * 1214 ni6_input(struct mbuf *m, int off) 1215 { 1216 struct icmp6_nodeinfo *ni6, *nni6; 1217 struct mbuf *n = NULL; 1218 u_int16_t qtype; 1219 int subjlen; 1220 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1221 struct ni_reply_fqdn *fqdn; 1222 int addrs; /* for NI_QTYPE_NODEADDR */ 1223 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1224 struct sockaddr_in6 sin6; /* ip6_dst */ 1225 struct in6_addr in6_subj; /* subject address */ 1226 struct ip6_hdr *ip6; 1227 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1228 char *subj = NULL; 1229 struct ifnet *rcvif; 1230 int s, ss; 1231 struct ifaddr *ifa; 1232 struct psref psref; 1233 1234 ip6 = mtod(m, struct ip6_hdr *); 1235 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1236 if (ni6 == NULL) { 1237 /* m is already reclaimed */ 1238 return NULL; 1239 } 1240 KASSERT((m->m_flags & M_PKTHDR) != 0); 1241 1242 /* 1243 * Validate IPv6 destination address. 1244 * 1245 * The Responder must discard the Query without further processing 1246 * unless it is one of the Responder's unicast or anycast addresses, or 1247 * a link-local scope multicast address which the Responder has joined. 1248 * [icmp-name-lookups-07, Section 4.] 1249 */ 1250 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1251 /* XXX scopeid */ 1252 ss = pserialize_read_enter(); 1253 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1254 if (ifa != NULL) { 1255 ; /* unicast/anycast, fine */ 1256 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) { 1257 ; /* link-local multicast, fine */ 1258 } else { 1259 pserialize_read_exit(ss); 1260 goto bad; 1261 } 1262 pserialize_read_exit(ss); 1263 1264 /* validate query Subject field. */ 1265 qtype = ntohs(ni6->ni_qtype); 1266 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1267 switch (qtype) { 1268 case NI_QTYPE_NOOP: 1269 case NI_QTYPE_SUPTYPES: 1270 /* 07 draft */ 1271 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1272 break; 1273 /* FALLTHROUGH */ 1274 case NI_QTYPE_FQDN: 1275 case NI_QTYPE_NODEADDR: 1276 case NI_QTYPE_IPV4ADDR: 1277 switch (ni6->ni_code) { 1278 case ICMP6_NI_SUBJ_IPV6: 1279 #if ICMP6_NI_SUBJ_IPV6 != 0 1280 case 0: 1281 #endif 1282 /* 1283 * backward compatibility - try to accept 03 draft 1284 * format, where no Subject is present. 1285 */ 1286 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1287 subjlen == 0) { 1288 oldfqdn++; 1289 break; 1290 } 1291 #if ICMP6_NI_SUBJ_IPV6 != 0 1292 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1293 goto bad; 1294 #endif 1295 1296 if (subjlen != sizeof(sin6.sin6_addr)) 1297 goto bad; 1298 1299 /* 1300 * Validate Subject address. 1301 * 1302 * Not sure what exactly "address belongs to the node" 1303 * means in the spec, is it just unicast, or what? 1304 * 1305 * At this moment we consider Subject address as 1306 * "belong to the node" if the Subject address equals 1307 * to the IPv6 destination address; validation for 1308 * IPv6 destination address should have done enough 1309 * check for us. 1310 * 1311 * We do not do proxy at this moment. 1312 */ 1313 /* m_pulldown instead of copy? */ 1314 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1315 subjlen, (void *)&in6_subj); 1316 rcvif = m_get_rcvif(m, &s); 1317 if (__predict_false(rcvif == NULL)) 1318 goto bad; 1319 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1320 m_put_rcvif(rcvif, &s); 1321 goto bad; 1322 } 1323 m_put_rcvif(rcvif, &s); 1324 1325 subj = (char *)&in6_subj; 1326 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1327 break; 1328 1329 /* 1330 * XXX if we are to allow other cases, we should really 1331 * be careful about scope here. 1332 * basically, we should disallow queries toward IPv6 1333 * destination X with subject Y, if scope(X) > scope(Y). 1334 * if we allow scope(X) > scope(Y), it will result in 1335 * information leakage across scope boundary. 1336 */ 1337 goto bad; 1338 1339 case ICMP6_NI_SUBJ_FQDN: 1340 /* 1341 * Validate Subject name with gethostname(3). 1342 * 1343 * The behavior may need some debate, since: 1344 * - we are not sure if the node has FQDN as 1345 * hostname (returned by gethostname(3)). 1346 * - the code does wildcard match for truncated names. 1347 * however, we are not sure if we want to perform 1348 * wildcard match, if gethostname(3) side has 1349 * truncated hostname. 1350 */ 1351 n = ni6_nametodns(hostname, hostnamelen, 0); 1352 if (!n || n->m_next || n->m_len == 0) 1353 goto bad; 1354 IP6_EXTHDR_GET(subj, char *, m, 1355 off + sizeof(struct icmp6_nodeinfo), subjlen); 1356 if (subj == NULL) 1357 goto bad; 1358 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1359 n->m_len)) { 1360 goto bad; 1361 } 1362 m_freem(n); 1363 n = NULL; 1364 break; 1365 1366 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1367 default: 1368 goto bad; 1369 } 1370 break; 1371 } 1372 1373 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1374 switch (qtype) { 1375 case NI_QTYPE_FQDN: 1376 if ((icmp6_nodeinfo & 1) == 0) 1377 goto bad; 1378 break; 1379 case NI_QTYPE_NODEADDR: 1380 case NI_QTYPE_IPV4ADDR: 1381 if ((icmp6_nodeinfo & 2) == 0) 1382 goto bad; 1383 break; 1384 } 1385 1386 /* guess reply length */ 1387 switch (qtype) { 1388 case NI_QTYPE_NOOP: 1389 break; /* no reply data */ 1390 case NI_QTYPE_SUPTYPES: 1391 replylen += sizeof(u_int32_t); 1392 break; 1393 case NI_QTYPE_FQDN: 1394 /* will append an mbuf */ 1395 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1396 break; 1397 case NI_QTYPE_NODEADDR: 1398 addrs = ni6_addrs(ni6, &ifp, subj, &psref); 1399 replylen += addrs * 1400 (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1401 if (replylen > MCLBYTES) 1402 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1403 break; 1404 case NI_QTYPE_IPV4ADDR: 1405 /* unsupported - should respond with unknown Qtype? */ 1406 goto bad; 1407 default: 1408 /* 1409 * XXX: We must return a reply with the ICMP6 code 1410 * `unknown Qtype' in this case. However we regard the case 1411 * as an FQDN query for backward compatibility. 1412 * Older versions set a random value to this field, 1413 * so it rarely varies in the defined qtypes. 1414 * But the mechanism is not reliable... 1415 * maybe we should obsolete older versions. 1416 */ 1417 qtype = NI_QTYPE_FQDN; 1418 /* will append an mbuf */ 1419 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1420 oldfqdn++; 1421 break; 1422 } 1423 1424 /* allocate an mbuf to reply. */ 1425 MGETHDR(n, M_DONTWAIT, m->m_type); 1426 if (n == NULL) { 1427 goto bad; 1428 } 1429 m_move_pkthdr(n, m); 1430 if (replylen > MHLEN) { 1431 if (replylen > MCLBYTES) { 1432 /* 1433 * XXX: should we try to allocate more? But MCLBYTES 1434 * is probably much larger than IPV6_MMTU... 1435 */ 1436 goto bad; 1437 } 1438 MCLGET(n, M_DONTWAIT); 1439 if ((n->m_flags & M_EXT) == 0) { 1440 goto bad; 1441 } 1442 } 1443 n->m_pkthdr.len = n->m_len = replylen; 1444 1445 /* copy mbuf header and IPv6 + Node Information base headers */ 1446 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1447 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1448 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1449 1450 /* qtype dependent procedure */ 1451 switch (qtype) { 1452 case NI_QTYPE_NOOP: 1453 nni6->ni_code = ICMP6_NI_SUCCESS; 1454 nni6->ni_flags = 0; 1455 break; 1456 case NI_QTYPE_SUPTYPES: 1457 { 1458 u_int32_t v; 1459 nni6->ni_code = ICMP6_NI_SUCCESS; 1460 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1461 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1462 v = (u_int32_t)htonl(0x0000000f); 1463 memcpy(nni6 + 1, &v, sizeof(u_int32_t)); 1464 break; 1465 } 1466 case NI_QTYPE_FQDN: 1467 nni6->ni_code = ICMP6_NI_SUCCESS; 1468 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1469 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 1470 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1471 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1472 /* 1473 * XXX do we really have FQDN in variable "hostname"? 1474 */ 1475 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1476 if (n->m_next == NULL) 1477 goto bad; 1478 /* XXX we assume that n->m_next is not a chain */ 1479 if (n->m_next->m_next != NULL) 1480 goto bad; 1481 n->m_pkthdr.len += n->m_next->m_len; 1482 break; 1483 case NI_QTYPE_NODEADDR: 1484 { 1485 int lenlim, copied; 1486 1487 nni6->ni_code = ICMP6_NI_SUCCESS; 1488 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1489 sizeof(struct icmp6_nodeinfo); 1490 lenlim = M_TRAILINGSPACE(n); 1491 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1492 if_put(ifp, &psref); 1493 ifp = NULL; 1494 /* update mbuf length */ 1495 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1496 sizeof(struct icmp6_nodeinfo) + copied; 1497 break; 1498 } 1499 default: 1500 panic("%s: impossible", __func__); 1501 break; 1502 } 1503 1504 nni6->ni_type = ICMP6_NI_REPLY; 1505 m_freem(m); 1506 return n; 1507 1508 bad: 1509 if_put(ifp, &psref); 1510 m_freem(m); 1511 if (n) 1512 m_freem(n); 1513 return NULL; 1514 } 1515 1516 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1517 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1518 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1519 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1520 1521 /* 1522 * make a mbuf with DNS-encoded string. no compression support. 1523 * 1524 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1525 * treated as truncated name (two \0 at the end). this is a wild guess. 1526 * 1527 * old - return pascal string if non-zero 1528 */ 1529 static struct mbuf * 1530 ni6_nametodns(const char *name, int namelen, int old) 1531 { 1532 struct mbuf *m; 1533 char *cp, *ep; 1534 const char *p, *q; 1535 int i, len, nterm; 1536 1537 if (old) 1538 len = namelen + 1; 1539 else 1540 len = MCLBYTES; 1541 1542 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1543 MGET(m, M_DONTWAIT, MT_DATA); 1544 if (m && len > MLEN) { 1545 MCLGET(m, M_DONTWAIT); 1546 if ((m->m_flags & M_EXT) == 0) 1547 goto fail; 1548 } 1549 if (!m) 1550 goto fail; 1551 m->m_next = NULL; 1552 1553 if (old) { 1554 m->m_len = len; 1555 *mtod(m, char *) = namelen; 1556 memcpy(mtod(m, char *) + 1, name, namelen); 1557 return m; 1558 } else { 1559 m->m_len = 0; 1560 cp = mtod(m, char *); 1561 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1562 1563 /* if not certain about my name, return empty buffer */ 1564 if (namelen == 0) 1565 return m; 1566 1567 /* 1568 * guess if it looks like shortened hostname, or FQDN. 1569 * shortened hostname needs two trailing "\0". 1570 */ 1571 i = 0; 1572 for (p = name; p < name + namelen; p++) { 1573 if (*p == '.') 1574 i++; 1575 } 1576 if (i < 2) 1577 nterm = 2; 1578 else 1579 nterm = 1; 1580 1581 p = name; 1582 while (cp < ep && p < name + namelen) { 1583 i = 0; 1584 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1585 i++; 1586 /* result does not fit into mbuf */ 1587 if (cp + i + 1 >= ep) 1588 goto fail; 1589 /* 1590 * DNS label length restriction, RFC1035 page 8. 1591 * "i == 0" case is included here to avoid returning 1592 * 0-length label on "foo..bar". 1593 */ 1594 if (i <= 0 || i >= 64) 1595 goto fail; 1596 *cp++ = i; 1597 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1598 goto fail; 1599 while (i > 0) { 1600 if (!isalnum(*p) && *p != '-') 1601 goto fail; 1602 if (isupper(*p)) { 1603 *cp++ = tolower(*p); 1604 p++; 1605 } else 1606 *cp++ = *p++; 1607 i--; 1608 } 1609 p = q; 1610 if (p < name + namelen && *p == '.') 1611 p++; 1612 } 1613 /* termination */ 1614 if (cp + nterm >= ep) 1615 goto fail; 1616 while (nterm-- > 0) 1617 *cp++ = '\0'; 1618 m->m_len = cp - mtod(m, char *); 1619 return m; 1620 } 1621 1622 panic("should not reach here"); 1623 /* NOTREACHED */ 1624 1625 fail: 1626 if (m) 1627 m_freem(m); 1628 return NULL; 1629 } 1630 1631 /* 1632 * check if two DNS-encoded string matches. takes care of truncated 1633 * form (with \0\0 at the end). no compression support. 1634 * XXX upper/lowercase match (see RFC2065) 1635 */ 1636 static int 1637 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1638 { 1639 const char *a0, *b0; 1640 int l; 1641 1642 /* simplest case - need validation? */ 1643 if (alen == blen && memcmp(a, b, alen) == 0) 1644 return 1; 1645 1646 a0 = a; 1647 b0 = b; 1648 1649 /* termination is mandatory */ 1650 if (alen < 2 || blen < 2) 1651 return 0; 1652 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1653 return 0; 1654 alen--; 1655 blen--; 1656 1657 while (a - a0 < alen && b - b0 < blen) { 1658 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1659 return 0; 1660 1661 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1662 return 0; 1663 /* we don't support compression yet */ 1664 if (a[0] >= 64 || b[0] >= 64) 1665 return 0; 1666 1667 /* truncated case */ 1668 if (a[0] == 0 && a - a0 == alen - 1) 1669 return 1; 1670 if (b[0] == 0 && b - b0 == blen - 1) 1671 return 1; 1672 if (a[0] == 0 || b[0] == 0) 1673 return 0; 1674 1675 if (a[0] != b[0]) 1676 return 0; 1677 l = a[0]; 1678 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1679 return 0; 1680 if (memcmp(a + 1, b + 1, l) != 0) 1681 return 0; 1682 1683 a += 1 + l; 1684 b += 1 + l; 1685 } 1686 1687 if (a - a0 == alen && b - b0 == blen) 1688 return 1; 1689 else 1690 return 0; 1691 } 1692 1693 /* 1694 * calculate the number of addresses to be returned in the node info reply. 1695 */ 1696 static int 1697 ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj, 1698 struct psref *psref) 1699 { 1700 struct ifnet *ifp; 1701 struct in6_ifaddr *ia6; 1702 struct ifaddr *ifa; 1703 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1704 int addrs = 0, addrsofif, iffound = 0; 1705 int niflags = ni6->ni_flags; 1706 int s; 1707 1708 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1709 switch (ni6->ni_code) { 1710 case ICMP6_NI_SUBJ_IPV6: 1711 if (subj == NULL) /* must be impossible... */ 1712 return 0; 1713 subj_ip6 = (struct sockaddr_in6 *)subj; 1714 break; 1715 default: 1716 /* 1717 * XXX: we only support IPv6 subject address for 1718 * this Qtype. 1719 */ 1720 return 0; 1721 } 1722 } 1723 1724 s = pserialize_read_enter(); 1725 IFNET_READER_FOREACH(ifp) { 1726 addrsofif = 0; 1727 IFADDR_READER_FOREACH(ifa, ifp) { 1728 if (ifa->ifa_addr->sa_family != AF_INET6) 1729 continue; 1730 ia6 = (struct in6_ifaddr *)ifa; 1731 1732 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1733 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1734 &ia6->ia_addr.sin6_addr)) 1735 iffound = 1; 1736 1737 /* 1738 * IPv4-mapped addresses can only be returned by a 1739 * Node Information proxy, since they represent 1740 * addresses of IPv4-only nodes, which perforce do 1741 * not implement this protocol. 1742 * [icmp-name-lookups-07, Section 5.4] 1743 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1744 * this function at this moment. 1745 */ 1746 1747 /* What do we have to do about ::1? */ 1748 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1749 case IPV6_ADDR_SCOPE_LINKLOCAL: 1750 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1751 continue; 1752 break; 1753 case IPV6_ADDR_SCOPE_SITELOCAL: 1754 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1755 continue; 1756 break; 1757 case IPV6_ADDR_SCOPE_GLOBAL: 1758 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1759 continue; 1760 break; 1761 default: 1762 continue; 1763 } 1764 1765 /* 1766 * check if anycast is okay. 1767 * XXX: just experimental. not in the spec. 1768 */ 1769 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1770 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1771 continue; /* we need only unicast addresses */ 1772 1773 addrsofif++; /* count the address */ 1774 } 1775 if (iffound) { 1776 if_acquire(ifp, psref); 1777 pserialize_read_exit(s); 1778 *ifpp = ifp; 1779 return addrsofif; 1780 } 1781 1782 addrs += addrsofif; 1783 } 1784 pserialize_read_exit(s); 1785 1786 return addrs; 1787 } 1788 1789 static int 1790 ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1791 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1792 int resid) 1793 { 1794 struct ifnet *ifp; 1795 struct in6_ifaddr *ia6; 1796 struct ifaddr *ifa; 1797 struct ifnet *ifp_dep = NULL; 1798 int copied = 0, allow_deprecated = 0; 1799 u_char *cp = (u_char *)(nni6 + 1); 1800 int niflags = ni6->ni_flags; 1801 u_int32_t ltime; 1802 int s; 1803 1804 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1805 return 0; /* needless to copy */ 1806 1807 s = pserialize_read_enter(); 1808 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1809 again: 1810 1811 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1812 { 1813 IFADDR_READER_FOREACH(ifa, ifp) { 1814 if (ifa->ifa_addr->sa_family != AF_INET6) 1815 continue; 1816 ia6 = (struct in6_ifaddr *)ifa; 1817 1818 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1819 allow_deprecated == 0) { 1820 /* 1821 * prefererred address should be put before 1822 * deprecated addresses. 1823 */ 1824 1825 /* record the interface for later search */ 1826 if (ifp_dep == NULL) 1827 ifp_dep = ifp; 1828 1829 continue; 1830 } 1831 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1832 allow_deprecated != 0) 1833 continue; /* we now collect deprecated addrs */ 1834 1835 /* What do we have to do about ::1? */ 1836 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1837 case IPV6_ADDR_SCOPE_LINKLOCAL: 1838 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1839 continue; 1840 break; 1841 case IPV6_ADDR_SCOPE_SITELOCAL: 1842 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1843 continue; 1844 break; 1845 case IPV6_ADDR_SCOPE_GLOBAL: 1846 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1847 continue; 1848 break; 1849 default: 1850 continue; 1851 } 1852 1853 /* 1854 * check if anycast is okay. 1855 * XXX: just experimental. not in the spec. 1856 */ 1857 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1858 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1859 continue; 1860 1861 /* now we can copy the address */ 1862 if (resid < sizeof(struct in6_addr) + 1863 sizeof(u_int32_t)) { 1864 /* 1865 * We give up much more copy. 1866 * Set the truncate flag and return. 1867 */ 1868 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1869 goto out; 1870 } 1871 1872 /* 1873 * Set the TTL of the address. 1874 * The TTL value should be one of the following 1875 * according to the specification: 1876 * 1877 * 1. The remaining lifetime of a DHCP lease on the 1878 * address, or 1879 * 2. The remaining Valid Lifetime of a prefix from 1880 * which the address was derived through Stateless 1881 * Autoconfiguration. 1882 * 1883 * Note that we currently do not support stateful 1884 * address configuration by DHCPv6, so the former 1885 * case can't happen. 1886 * 1887 * TTL must be 2^31 > TTL >= 0. 1888 */ 1889 if (ia6->ia6_lifetime.ia6t_expire == 0) 1890 ltime = ND6_INFINITE_LIFETIME; 1891 else { 1892 if (ia6->ia6_lifetime.ia6t_expire > 1893 time_uptime) 1894 ltime = ia6->ia6_lifetime.ia6t_expire - 1895 time_uptime; 1896 else 1897 ltime = 0; 1898 } 1899 if (ltime > 0x7fffffff) 1900 ltime = 0x7fffffff; 1901 ltime = htonl(ltime); 1902 1903 memcpy(cp, <ime, sizeof(u_int32_t)); 1904 cp += sizeof(u_int32_t); 1905 1906 /* copy the address itself */ 1907 bcopy(&ia6->ia_addr.sin6_addr, cp, 1908 sizeof(struct in6_addr)); 1909 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1910 cp += sizeof(struct in6_addr); 1911 1912 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1913 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1914 } 1915 if (ifp0) /* we need search only on the specified IF */ 1916 break; 1917 } 1918 1919 if (allow_deprecated == 0 && ifp_dep != NULL) { 1920 ifp = ifp_dep; 1921 allow_deprecated = 1; 1922 1923 goto again; 1924 } 1925 out: 1926 pserialize_read_exit(s); 1927 return copied; 1928 } 1929 1930 /* 1931 * XXX almost dup'ed code with rip6_input. 1932 */ 1933 static int 1934 icmp6_rip6_input(struct mbuf **mp, int off) 1935 { 1936 struct mbuf *m = *mp; 1937 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1938 struct inpcb_hdr *inph; 1939 struct in6pcb *in6p; 1940 struct in6pcb *last = NULL; 1941 struct sockaddr_in6 rip6src; 1942 struct icmp6_hdr *icmp6; 1943 struct mbuf *n, *opts = NULL; 1944 1945 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1946 if (icmp6 == NULL) { 1947 /* m is already reclaimed */ 1948 return IPPROTO_DONE; 1949 } 1950 1951 /* 1952 * XXX: the address may have embedded scope zone ID, which should be 1953 * hidden from applications. 1954 */ 1955 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1956 if (sa6_recoverscope(&rip6src)) { 1957 m_freem(m); 1958 return IPPROTO_DONE; 1959 } 1960 1961 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1962 in6p = (struct in6pcb *)inph; 1963 if (in6p->in6p_af != AF_INET6) 1964 continue; 1965 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1966 continue; 1967 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1968 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1969 continue; 1970 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1971 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1972 continue; 1973 if (in6p->in6p_icmp6filt && 1974 ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1975 in6p->in6p_icmp6filt)) 1976 continue; 1977 1978 if (last == NULL) { 1979 ; 1980 } 1981 #ifdef IPSEC 1982 else if (ipsec_used && ipsec_in_reject(m, last)) { 1983 /* do not inject data into pcb */ 1984 } 1985 #endif 1986 else if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 1987 if (last->in6p_flags & IN6P_CONTROLOPTS) 1988 ip6_savecontrol(last, &opts, ip6, n); 1989 /* strip intermediate headers */ 1990 m_adj(n, off); 1991 if (sbappendaddr(&last->in6p_socket->so_rcv, 1992 sin6tosa(&rip6src), n, opts) == 0) { 1993 soroverflow(last->in6p_socket); 1994 m_freem(n); 1995 if (opts) 1996 m_freem(opts); 1997 } else { 1998 sorwakeup(last->in6p_socket); 1999 } 2000 opts = NULL; 2001 } 2002 2003 last = in6p; 2004 } 2005 2006 #ifdef IPSEC 2007 if (ipsec_used && last && ipsec_in_reject(m, last)) { 2008 m_freem(m); 2009 IP6_STATDEC(IP6_STAT_DELIVERED); 2010 /* do not inject data into pcb */ 2011 } else 2012 #endif 2013 if (last) { 2014 if (last->in6p_flags & IN6P_CONTROLOPTS) 2015 ip6_savecontrol(last, &opts, ip6, m); 2016 /* strip intermediate headers */ 2017 m_adj(m, off); 2018 if (sbappendaddr(&last->in6p_socket->so_rcv, 2019 sin6tosa(&rip6src), m, opts) == 0) { 2020 soroverflow(last->in6p_socket); 2021 m_freem(m); 2022 if (opts) 2023 m_freem(opts); 2024 } else { 2025 sorwakeup(last->in6p_socket); 2026 } 2027 } else { 2028 m_freem(m); 2029 IP6_STATDEC(IP6_STAT_DELIVERED); 2030 } 2031 return IPPROTO_DONE; 2032 } 2033 2034 /* 2035 * Reflect the ip6 packet back to the source. 2036 * OFF points to the icmp6 header, counted from the top of the mbuf. 2037 * 2038 * Note: RFC 1885 required that an echo reply should be truncated if it 2039 * did not fit in with (return) path MTU, and KAME code supported the 2040 * behavior. However, as a clarification after the RFC, this limitation 2041 * was removed in a revised version of the spec, RFC 2463. We had kept the 2042 * old behavior, with a (non-default) ifdef block, while the new version of 2043 * the spec was an internet-draft status, and even after the new RFC was 2044 * published. But it would rather make sense to clean the obsoleted part 2045 * up, and to make the code simpler at this stage. 2046 */ 2047 static void 2048 icmp6_reflect(struct mbuf *m, size_t off) 2049 { 2050 struct ip6_hdr *ip6; 2051 struct icmp6_hdr *icmp6; 2052 const struct in6_ifaddr *ia; 2053 const struct ip6aux *ip6a; 2054 int plen; 2055 int type, code; 2056 struct ifnet *outif = NULL; 2057 struct in6_addr origdst; 2058 struct ifnet *rcvif; 2059 int s; 2060 bool ip6_src_filled = false; 2061 2062 /* too short to reflect */ 2063 if (off < sizeof(struct ip6_hdr)) { 2064 nd6log(LOG_DEBUG, 2065 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2066 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2067 __FILE__, __LINE__); 2068 goto bad; 2069 } 2070 2071 /* 2072 * If there are extra headers between IPv6 and ICMPv6, strip 2073 * off that header first. 2074 */ 2075 CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN); 2076 if (off > sizeof(struct ip6_hdr)) { 2077 size_t l; 2078 struct ip6_hdr nip6; 2079 2080 l = off - sizeof(struct ip6_hdr); 2081 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2082 m_adj(m, l); 2083 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2084 if (m->m_len < l) { 2085 if ((m = m_pullup(m, l)) == NULL) 2086 return; 2087 } 2088 memcpy(mtod(m, void *), (void *)&nip6, sizeof(nip6)); 2089 } else { 2090 size_t l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2091 if (m->m_len < l) { 2092 if ((m = m_pullup(m, l)) == NULL) 2093 return; 2094 } 2095 } 2096 2097 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2098 ip6 = mtod(m, struct ip6_hdr *); 2099 ip6->ip6_nxt = IPPROTO_ICMPV6; 2100 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2101 type = icmp6->icmp6_type; /* keep type for statistics */ 2102 code = icmp6->icmp6_code; /* ditto. */ 2103 2104 origdst = ip6->ip6_dst; 2105 /* 2106 * ip6_input() drops a packet if its src is multicast. 2107 * So, the src is never multicast. 2108 */ 2109 ip6->ip6_dst = ip6->ip6_src; 2110 2111 /* 2112 * If the incoming packet was addressed directly to us (i.e. unicast), 2113 * use dst as the src for the reply. 2114 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2115 * (for example) when we encounter an error while forwarding procedure 2116 * destined to a duplicated address of ours. 2117 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2118 * procedure of an outgoing packet of our own, in which case we need 2119 * to search in the ifaddr list. 2120 */ 2121 if (IN6_IS_ADDR_MULTICAST(&origdst)) { 2122 ; 2123 } else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2124 if ((ip6a->ip6a_flags & 2125 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2126 ip6->ip6_src = ip6a->ip6a_src; 2127 ip6_src_filled = true; 2128 } 2129 } else { 2130 union { 2131 struct sockaddr_in6 sin6; 2132 struct sockaddr sa; 2133 } u; 2134 int _s; 2135 struct ifaddr *ifa; 2136 2137 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2138 2139 _s = pserialize_read_enter(); 2140 ifa = ifa_ifwithaddr(&u.sa); 2141 2142 if (ifa != NULL) { 2143 ia = ifatoia6(ifa); 2144 if ((ia->ia6_flags & 2145 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2146 ip6->ip6_src = ia->ia_addr.sin6_addr; 2147 ip6_src_filled = true; 2148 } 2149 } 2150 pserialize_read_exit(_s); 2151 } 2152 2153 if (!ip6_src_filled) { 2154 int e; 2155 struct sockaddr_in6 sin6; 2156 struct route ro; 2157 2158 /* 2159 * This case matches to multicasts, our anycast, or unicasts 2160 * that we do not own. Select a source address based on the 2161 * source address of the erroneous packet. 2162 */ 2163 /* zone ID should be embedded */ 2164 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2165 2166 memset(&ro, 0, sizeof(ro)); 2167 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2168 &ip6->ip6_src); 2169 rtcache_free(&ro); 2170 if (e != 0) { 2171 char ip6buf[INET6_ADDRSTRLEN]; 2172 nd6log(LOG_DEBUG, 2173 "source can't be determined: " 2174 "dst=%s, error=%d\n", 2175 IN6_PRINT(ip6buf, &sin6.sin6_addr), e); 2176 goto bad; 2177 } 2178 } 2179 2180 ip6->ip6_flow = 0; 2181 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2182 ip6->ip6_vfc |= IPV6_VERSION; 2183 ip6->ip6_nxt = IPPROTO_ICMPV6; 2184 rcvif = m_get_rcvif(m, &s); 2185 if (rcvif) { 2186 /* XXX: This may not be the outgoing interface */ 2187 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2188 } else { 2189 ip6->ip6_hlim = ip6_defhlim; 2190 } 2191 m_put_rcvif(rcvif, &s); 2192 2193 m->m_pkthdr.csum_flags = 0; 2194 icmp6->icmp6_cksum = 0; 2195 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2196 sizeof(struct ip6_hdr), plen); 2197 2198 /* 2199 * XXX option handling 2200 */ 2201 2202 m->m_flags &= ~(M_BCAST|M_MCAST); 2203 2204 /* 2205 * To avoid a "too big" situation at an intermediate router 2206 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2207 * Note that only echo and node information replies are affected, 2208 * since the length of ICMP6 errors is limited to the minimum MTU. 2209 */ 2210 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) != 0 && 2211 outif) 2212 icmp6_ifstat_inc(outif, ifs6_out_error); 2213 if (outif) 2214 icmp6_ifoutstat_inc(outif, type, code); 2215 2216 return; 2217 2218 bad: 2219 m_freem(m); 2220 return; 2221 } 2222 2223 static const char * 2224 icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6, 2225 struct in6_addr *dst6, struct in6_addr *tgt6) 2226 { 2227 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 2228 char ip6buft[INET6_ADDRSTRLEN]; 2229 2230 snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)", 2231 IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6), 2232 IN6_PRINT(ip6buft, tgt6)); 2233 return buf; 2234 } 2235 2236 static void 2237 icmp6_redirect_input(struct mbuf *m, int off) 2238 { 2239 struct ifnet *ifp; 2240 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2241 struct nd_redirect *nd_rd; 2242 int icmp6len = m->m_pkthdr.len - off; 2243 char *lladdr = NULL; 2244 int lladdrlen = 0; 2245 struct rtentry *rt = NULL; 2246 int is_router; 2247 int is_onlink; 2248 struct in6_addr src6 = ip6->ip6_src; 2249 struct in6_addr redtgt6; 2250 struct in6_addr reddst6; 2251 union nd_opts ndopts; 2252 struct psref psref; 2253 char ip6buf[INET6_ADDRSTRLEN]; 2254 char diagbuf[256]; 2255 2256 ifp = m_get_rcvif_psref(m, &psref); 2257 if (ifp == NULL) 2258 goto freeit; 2259 2260 /* XXX if we are router, we don't update route by icmp6 redirect */ 2261 if (ip6_forwarding) 2262 goto freeit; 2263 if (!icmp6_rediraccept) 2264 goto freeit; 2265 2266 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2267 if (nd_rd == NULL) { 2268 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2269 m_put_rcvif_psref(ifp, &psref); 2270 return; 2271 } 2272 redtgt6 = nd_rd->nd_rd_target; 2273 reddst6 = nd_rd->nd_rd_dst; 2274 2275 if (in6_setscope(&redtgt6, ifp, NULL) || 2276 in6_setscope(&reddst6, ifp, NULL)) { 2277 goto freeit; 2278 } 2279 2280 /* validation */ 2281 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2282 nd6log(LOG_ERR, 2283 "ICMP6 redirect sent from %s rejected; " 2284 "must be from linklocal\n", IN6_PRINT(ip6buf, &src6)); 2285 goto bad; 2286 } 2287 if (ip6->ip6_hlim != 255) { 2288 nd6log(LOG_ERR, 2289 "ICMP6 redirect sent from %s rejected; " 2290 "hlim=%d (must be 255)\n", 2291 IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim); 2292 goto bad; 2293 } 2294 2295 { 2296 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2297 struct sockaddr_in6 sin6; 2298 struct in6_addr *gw6; 2299 2300 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2301 rt = rtalloc1(sin6tosa(&sin6), 0); 2302 if (rt) { 2303 if (rt->rt_gateway == NULL || 2304 rt->rt_gateway->sa_family != AF_INET6) { 2305 nd6log(LOG_ERR, 2306 "ICMP6 redirect rejected; no route " 2307 "with inet6 gateway found for redirect dst: %s\n", 2308 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2309 &src6, &reddst6, &redtgt6)); 2310 rt_unref(rt); 2311 goto bad; 2312 } 2313 2314 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2315 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2316 nd6log(LOG_ERR, 2317 "ICMP6 redirect rejected; " 2318 "not equal to gw-for-src=%s (must be same): %s\n", 2319 IN6_PRINT(ip6buf, gw6), 2320 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2321 &src6, &reddst6, &redtgt6)); 2322 rt_unref(rt); 2323 goto bad; 2324 } 2325 } else { 2326 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2327 "no route found for redirect dst: %s\n", 2328 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2329 &src6, &reddst6, &redtgt6)); 2330 goto bad; 2331 } 2332 rt_unref(rt); 2333 rt = NULL; 2334 } 2335 2336 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2337 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2338 "redirect dst must be unicast: %s\n", 2339 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2340 &src6, &reddst6, &redtgt6)); 2341 goto bad; 2342 } 2343 2344 is_router = is_onlink = 0; 2345 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2346 is_router = 1; /* router case */ 2347 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2348 is_onlink = 1; /* on-link destination case */ 2349 if (!is_router && !is_onlink) { 2350 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2351 "neither router case nor onlink case: %s\n", 2352 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2353 &src6, &reddst6, &redtgt6)); 2354 goto bad; 2355 } 2356 /* validation passed */ 2357 2358 icmp6len -= sizeof(*nd_rd); 2359 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2360 if (nd6_options(&ndopts) < 0) { 2361 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2362 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2363 &src6, &reddst6, &redtgt6)); 2364 /* nd6_options have incremented stats */ 2365 goto freeit; 2366 } 2367 2368 if (ndopts.nd_opts_tgt_lladdr) { 2369 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2370 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2371 } 2372 2373 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2374 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2375 "(if %d, icmp6 packet %d): %s\n", 2376 IN6_PRINT(ip6buf, &redtgt6), 2377 ifp->if_addrlen, lladdrlen - 2, 2378 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2379 &src6, &reddst6, &redtgt6)); 2380 goto bad; 2381 } 2382 2383 /* RFC 2461 8.3 */ 2384 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2385 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2386 2387 m_put_rcvif_psref(ifp, &psref); 2388 ifp = NULL; 2389 2390 if (!is_onlink) { /* better router case. perform rtredirect. */ 2391 /* perform rtredirect */ 2392 struct sockaddr_in6 sdst; 2393 struct sockaddr_in6 sgw; 2394 struct sockaddr_in6 ssrc; 2395 unsigned long rtcount; 2396 struct rtentry *newrt = NULL; 2397 2398 /* 2399 * do not install redirect route, if the number of entries 2400 * is too much (> hiwat). note that, the node (= host) will 2401 * work just fine even if we do not install redirect route 2402 * (there will be additional hops, though). 2403 */ 2404 mutex_enter(&icmp6_mtx); 2405 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2406 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) { 2407 mutex_exit(&icmp6_mtx); 2408 goto freeit; 2409 } 2410 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) { 2411 mutex_exit(&icmp6_mtx); 2412 goto freeit; 2413 } else if (0 <= icmp6_redirect_lowat && 2414 rtcount > icmp6_redirect_lowat) { 2415 /* 2416 * XXX nuke a victim, install the new one. 2417 */ 2418 } 2419 2420 memset(&sdst, 0, sizeof(sdst)); 2421 memset(&sgw, 0, sizeof(sgw)); 2422 memset(&ssrc, 0, sizeof(ssrc)); 2423 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2424 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2425 sizeof(struct sockaddr_in6); 2426 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2427 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2428 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2429 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2430 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), &newrt); 2431 2432 if (newrt) { 2433 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2434 icmp6_redirect_timeout_q); 2435 rt_unref(newrt); 2436 } 2437 mutex_exit(&icmp6_mtx); 2438 } 2439 /* finally update cached route in each socket via pfctlinput */ 2440 { 2441 struct sockaddr_in6 sdst; 2442 2443 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2444 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2445 #if defined(IPSEC) 2446 if (ipsec_used) 2447 key_sa_routechange(sin6tosa(&sdst)); 2448 #endif 2449 } 2450 2451 freeit: 2452 if (ifp != NULL) 2453 m_put_rcvif_psref(ifp, &psref); 2454 m_freem(m); 2455 return; 2456 2457 bad: 2458 m_put_rcvif_psref(ifp, &psref); 2459 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2460 m_freem(m); 2461 } 2462 2463 void 2464 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2465 { 2466 struct ifnet *ifp; /* my outgoing interface */ 2467 struct in6_addr *ifp_ll6; 2468 struct in6_addr *nexthop; 2469 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2470 struct mbuf *m = NULL; /* newly allocated one */ 2471 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2472 struct nd_redirect *nd_rd; 2473 size_t maxlen; 2474 u_char *p; 2475 struct sockaddr_in6 src_sa; 2476 2477 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2478 2479 /* if we are not router, we don't send icmp6 redirect */ 2480 if (!ip6_forwarding) 2481 goto fail; 2482 2483 /* sanity check */ 2484 KASSERT(m0 != NULL); 2485 KASSERT(rt != NULL); 2486 2487 ifp = rt->rt_ifp; 2488 2489 /* 2490 * Address check: 2491 * the source address must identify a neighbor, and 2492 * the destination address must not be a multicast address 2493 * [RFC 2461, sec 8.2] 2494 */ 2495 sip6 = mtod(m0, struct ip6_hdr *); 2496 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2497 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2498 goto fail; 2499 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2500 goto fail; /* what should we do here? */ 2501 2502 /* rate limit */ 2503 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2504 goto fail; 2505 2506 /* 2507 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2508 * we almost always ask for an mbuf cluster for simplicity. 2509 * (MHLEN < IPV6_MMTU is almost always true) 2510 */ 2511 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2512 if (m && IPV6_MMTU >= MHLEN) { 2513 #if IPV6_MMTU >= MCLBYTES 2514 MEXTMALLOC(m, IPV6_MMTU, M_NOWAIT); 2515 #else 2516 MCLGET(m, M_DONTWAIT); 2517 #endif 2518 } 2519 2520 if (!m) 2521 goto fail; 2522 m_reset_rcvif(m); 2523 m->m_len = 0; 2524 maxlen = M_TRAILINGSPACE(m); 2525 maxlen = uimin(IPV6_MMTU, maxlen); 2526 2527 /* just for safety */ 2528 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct nd_redirect) + 2529 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2530 goto fail; 2531 } 2532 2533 { 2534 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2535 struct in6_ifaddr *ia; 2536 int s = pserialize_read_enter(); 2537 if ((ia = in6ifa_ifpforlinklocal(ifp, 2538 IN6_IFF_NOTREADY| 2539 IN6_IFF_ANYCAST)) == NULL) { 2540 pserialize_read_exit(s); 2541 goto fail; 2542 } 2543 ifp_ll6 = &ia->ia_addr.sin6_addr; 2544 pserialize_read_exit(s); 2545 } 2546 2547 /* get ip6 linklocal address for the router. */ 2548 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2549 struct sockaddr_in6 *sin6; 2550 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2551 nexthop = &sin6->sin6_addr; 2552 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2553 nexthop = NULL; 2554 } else 2555 nexthop = NULL; 2556 2557 /* ip6 */ 2558 ip6 = mtod(m, struct ip6_hdr *); 2559 ip6->ip6_flow = 0; 2560 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2561 ip6->ip6_vfc |= IPV6_VERSION; 2562 /* ip6->ip6_plen will be set later */ 2563 ip6->ip6_nxt = IPPROTO_ICMPV6; 2564 ip6->ip6_hlim = 255; 2565 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2566 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2567 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2568 2569 /* ND Redirect */ 2570 nd_rd = (struct nd_redirect *)(ip6 + 1); 2571 nd_rd->nd_rd_type = ND_REDIRECT; 2572 nd_rd->nd_rd_code = 0; 2573 nd_rd->nd_rd_reserved = 0; 2574 if (rt->rt_flags & RTF_GATEWAY) { 2575 /* 2576 * nd_rd->nd_rd_target must be a link-local address in 2577 * better router cases. 2578 */ 2579 if (!nexthop) 2580 goto fail; 2581 bcopy(nexthop, &nd_rd->nd_rd_target, 2582 sizeof(nd_rd->nd_rd_target)); 2583 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2584 sizeof(nd_rd->nd_rd_dst)); 2585 } else { 2586 /* make sure redtgt == reddst */ 2587 nexthop = &sip6->ip6_dst; 2588 bcopy(&sip6->ip6_dst, &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 } 2593 2594 p = (u_char *)(nd_rd + 1); 2595 2596 { 2597 /* target lladdr option */ 2598 struct llentry *ln = NULL; 2599 int len, pad; 2600 struct nd_opt_hdr *nd_opt; 2601 char *lladdr; 2602 2603 ln = nd6_lookup(nexthop, ifp, false); 2604 if (ln == NULL) 2605 goto nolladdropt; 2606 len = sizeof(*nd_opt) + ifp->if_addrlen; 2607 len = (len + 7) & ~7; /* round by 8 */ 2608 pad = len - (sizeof(*nd_opt) + ifp->if_addrlen); 2609 2610 /* safety check */ 2611 if (len + (p - (u_char *)ip6) > maxlen) { 2612 LLE_RUNLOCK(ln); 2613 goto nolladdropt; 2614 } 2615 2616 if (ln->la_flags & LLE_VALID) { 2617 nd_opt = (struct nd_opt_hdr *)p; 2618 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2619 nd_opt->nd_opt_len = len >> 3; 2620 lladdr = (char *)(nd_opt + 1); 2621 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2622 memset(lladdr + ifp->if_addrlen, 0, pad); 2623 p += len; 2624 } 2625 LLE_RUNLOCK(ln); 2626 } 2627 nolladdropt: 2628 2629 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2630 2631 /* just to be safe */ 2632 if (m0->m_flags & M_DECRYPTED) 2633 goto noredhdropt; 2634 if (p - (u_char *)ip6 > maxlen) 2635 goto noredhdropt; 2636 2637 { 2638 /* redirected header option */ 2639 int len; 2640 struct nd_opt_rd_hdr *nd_opt_rh; 2641 2642 /* 2643 * compute the maximum size for icmp6 redirect header option. 2644 * XXX room for auth header? 2645 */ 2646 len = maxlen - (p - (u_char *)ip6); 2647 len &= ~7; 2648 2649 if (len < sizeof(*nd_opt_rh)) { 2650 goto noredhdropt; 2651 } 2652 2653 /* 2654 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2655 * about padding/truncate rule for the original IP packet. 2656 * From the discussion on IPv6imp in Feb 1999, 2657 * the consensus was: 2658 * - "attach as much as possible" is the goal 2659 * - pad if not aligned (original size can be guessed by 2660 * original ip6 header) 2661 * Following code adds the padding if it is simple enough, 2662 * and truncates if not. 2663 */ 2664 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2665 /* not enough room, truncate */ 2666 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2667 m0->m_pkthdr.len); 2668 } else { 2669 /* 2670 * enough room, truncate if not aligned. 2671 * we don't pad here for simplicity. 2672 */ 2673 int extra; 2674 2675 extra = m0->m_pkthdr.len % 8; 2676 if (extra) { 2677 /* truncate */ 2678 m_adj(m0, -extra); 2679 } 2680 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2681 } 2682 2683 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2684 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2685 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2686 nd_opt_rh->nd_opt_rh_len = len >> 3; 2687 p += sizeof(*nd_opt_rh); 2688 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2689 2690 /* connect m0 to m */ 2691 m->m_pkthdr.len += m0->m_pkthdr.len; 2692 m_cat(m, m0); 2693 m0 = NULL; 2694 } 2695 noredhdropt: 2696 if (m0) { 2697 m_freem(m0); 2698 m0 = NULL; 2699 } 2700 2701 /* XXX: clear embedded link IDs in the inner header */ 2702 in6_clearscope(&sip6->ip6_src); 2703 in6_clearscope(&sip6->ip6_dst); 2704 in6_clearscope(&nd_rd->nd_rd_target); 2705 in6_clearscope(&nd_rd->nd_rd_dst); 2706 2707 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2708 2709 nd_rd->nd_rd_cksum = 0; 2710 nd_rd->nd_rd_cksum = 2711 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2712 2713 /* send the packet to outside... */ 2714 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2715 icmp6_ifstat_inc(ifp, ifs6_out_error); 2716 2717 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2718 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2719 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2720 2721 return; 2722 2723 fail: 2724 if (m) 2725 m_freem(m); 2726 if (m0) 2727 m_freem(m0); 2728 } 2729 2730 /* 2731 * ICMPv6 socket option processing. 2732 */ 2733 int 2734 icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2735 { 2736 int error = 0; 2737 struct in6pcb *in6p = sotoin6pcb(so); 2738 2739 if (sopt->sopt_level != IPPROTO_ICMPV6) 2740 return rip6_ctloutput(op, so, sopt); 2741 2742 switch (op) { 2743 case PRCO_SETOPT: 2744 switch (sopt->sopt_name) { 2745 case ICMP6_FILTER: 2746 { 2747 struct icmp6_filter fil; 2748 2749 error = sockopt_get(sopt, &fil, sizeof(fil)); 2750 if (error) 2751 break; 2752 memcpy(in6p->in6p_icmp6filt, &fil, 2753 sizeof(struct icmp6_filter)); 2754 error = 0; 2755 break; 2756 } 2757 2758 default: 2759 error = ENOPROTOOPT; 2760 break; 2761 } 2762 break; 2763 2764 case PRCO_GETOPT: 2765 switch (sopt->sopt_name) { 2766 case ICMP6_FILTER: 2767 { 2768 if (in6p->in6p_icmp6filt == NULL) { 2769 error = EINVAL; 2770 break; 2771 } 2772 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2773 sizeof(struct icmp6_filter)); 2774 break; 2775 } 2776 2777 default: 2778 error = ENOPROTOOPT; 2779 break; 2780 } 2781 break; 2782 } 2783 2784 return error; 2785 } 2786 2787 /* 2788 * Perform rate limit check. 2789 * Returns 0 if it is okay to send the icmp6 packet. 2790 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2791 * limitation. 2792 * 2793 * XXX per-destination/type check necessary? 2794 */ 2795 static int 2796 icmp6_ratelimit( 2797 const struct in6_addr *dst, /* not used at this moment */ 2798 const int type, /* not used at this moment */ 2799 const int code) /* not used at this moment */ 2800 { 2801 int ret; 2802 2803 ret = 0; /* okay to send */ 2804 2805 /* PPS limit */ 2806 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2807 icmp6errppslim)) { 2808 /* The packet is subject to rate limit */ 2809 ret++; 2810 } 2811 2812 return ret; 2813 } 2814 2815 static struct rtentry * 2816 icmp6_mtudisc_clone(struct sockaddr *dst) 2817 { 2818 struct rtentry *rt; 2819 int error; 2820 2821 rt = rtalloc1(dst, 1); 2822 if (rt == NULL) 2823 return NULL; 2824 2825 /* If we didn't get a host route, allocate one */ 2826 if ((rt->rt_flags & RTF_HOST) == 0) { 2827 struct rtentry *nrt; 2828 2829 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2830 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2831 if (error) { 2832 rt_unref(rt); 2833 return NULL; 2834 } 2835 nrt->rt_rmx = rt->rt_rmx; 2836 rt_unref(rt); 2837 rt = nrt; 2838 } 2839 2840 mutex_enter(&icmp6_mtx); 2841 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2842 icmp6_mtudisc_timeout_q); 2843 mutex_exit(&icmp6_mtx); 2844 2845 if (error) { 2846 rt_unref(rt); 2847 return NULL; 2848 } 2849 2850 return rt; /* caller need to call rtfree() */ 2851 } 2852 2853 static void 2854 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2855 { 2856 struct rtentry *retrt; 2857 2858 KASSERT(rt != NULL); 2859 rt_assert_referenced(rt); 2860 2861 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2862 (RTF_DYNAMIC | RTF_HOST)) { 2863 rtrequest(RTM_DELETE, rt_getkey(rt), 2864 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt); 2865 rt_unref(rt); 2866 rt_free(retrt); 2867 } else { 2868 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2869 rt->rt_rmx.rmx_mtu = 0; 2870 } 2871 } 2872 2873 static void 2874 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2875 { 2876 struct rtentry *retrt; 2877 2878 KASSERT(rt != NULL); 2879 rt_assert_referenced(rt); 2880 2881 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2882 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2883 rtrequest(RTM_DELETE, rt_getkey(rt), 2884 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt); 2885 rt_unref(rt); 2886 rt_free(retrt); 2887 } 2888 } 2889 2890 #ifdef COMPAT_90 2891 /* 2892 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2893 */ 2894 static int 2895 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2896 { 2897 (void)&name; 2898 (void)&l; 2899 (void)&oname; 2900 2901 if (namelen != 0) 2902 return (EINVAL); 2903 2904 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2905 /*XXXUNCONST*/ 2906 __UNCONST(newp), newlen)); 2907 } 2908 #endif 2909 2910 static int 2911 sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2912 { 2913 2914 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2915 } 2916 2917 static int 2918 sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2919 { 2920 int error, tmp; 2921 struct sysctlnode node; 2922 2923 mutex_enter(&icmp6_mtx); 2924 2925 node = *rnode; 2926 node.sysctl_data = &tmp; 2927 tmp = icmp6_redirtimeout; 2928 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2929 if (error || newp == NULL) 2930 goto out; 2931 if (tmp < 0) { 2932 error = EINVAL; 2933 goto out; 2934 } 2935 icmp6_redirtimeout = tmp; 2936 2937 if (icmp6_redirect_timeout_q != NULL) { 2938 if (icmp6_redirtimeout == 0) { 2939 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2940 } else { 2941 rt_timer_queue_change(icmp6_redirect_timeout_q, 2942 icmp6_redirtimeout); 2943 } 2944 } else if (icmp6_redirtimeout > 0) { 2945 icmp6_redirect_timeout_q = 2946 rt_timer_queue_create(icmp6_redirtimeout); 2947 } 2948 error = 0; 2949 out: 2950 mutex_exit(&icmp6_mtx); 2951 return error; 2952 } 2953 2954 static void 2955 sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2956 { 2957 2958 sysctl_createv(clog, 0, NULL, NULL, 2959 CTLFLAG_PERMANENT, 2960 CTLTYPE_NODE, "inet6", NULL, 2961 NULL, 0, NULL, 0, 2962 CTL_NET, PF_INET6, CTL_EOL); 2963 sysctl_createv(clog, 0, NULL, NULL, 2964 CTLFLAG_PERMANENT, 2965 CTLTYPE_NODE, "icmp6", 2966 SYSCTL_DESCR("ICMPv6 related settings"), 2967 NULL, 0, NULL, 0, 2968 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2969 2970 sysctl_createv(clog, 0, NULL, NULL, 2971 CTLFLAG_PERMANENT, 2972 CTLTYPE_STRUCT, "stats", 2973 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2974 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2975 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2976 ICMPV6CTL_STATS, CTL_EOL); 2977 sysctl_createv(clog, 0, NULL, NULL, 2978 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2979 CTLTYPE_INT, "rediraccept", 2980 SYSCTL_DESCR("Accept and process redirect messages"), 2981 NULL, 0, &icmp6_rediraccept, 0, 2982 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2983 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2984 sysctl_createv(clog, 0, NULL, NULL, 2985 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2986 CTLTYPE_INT, "redirtimeout", 2987 SYSCTL_DESCR("Redirect generated route lifetime"), 2988 sysctl_net_inet6_icmp6_redirtimeout, 0, 2989 &icmp6_redirtimeout, 0, 2990 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2991 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2992 #if 0 /* obsoleted */ 2993 sysctl_createv(clog, 0, NULL, NULL, 2994 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2995 CTLTYPE_INT, "errratelimit", NULL, 2996 NULL, 0, &icmp6_errratelimit, 0, 2997 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2998 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2999 #endif 3000 sysctl_createv(clog, 0, NULL, NULL, 3001 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3002 CTLTYPE_INT, "nd6_prune", 3003 SYSCTL_DESCR("Neighbor discovery prune interval"), 3004 NULL, 0, &nd6_prune, 0, 3005 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3006 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 3007 sysctl_createv(clog, 0, NULL, NULL, 3008 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3009 CTLTYPE_INT, "nd6_delay", 3010 SYSCTL_DESCR("First probe delay time"), 3011 NULL, 0, &nd6_nd_domain.nd_delay, 0, 3012 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3013 ICMPV6CTL_ND6_DELAY, CTL_EOL); 3014 sysctl_createv(clog, 0, NULL, NULL, 3015 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3016 CTLTYPE_INT, "nd6_mmaxtries", 3017 SYSCTL_DESCR("Number of multicast discovery attempts"), 3018 NULL, 0, &nd6_nd_domain.nd_mmaxtries, 0, 3019 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3020 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 3021 sysctl_createv(clog, 0, NULL, NULL, 3022 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3023 CTLTYPE_INT, "nd6_umaxtries", 3024 SYSCTL_DESCR("Number of unicast discovery attempts"), 3025 NULL, 0, &nd6_nd_domain.nd_umaxtries, 0, 3026 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3027 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 3028 sysctl_createv(clog, 0, NULL, NULL, 3029 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3030 CTLTYPE_INT, "nd6_maxnudhint", 3031 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 3032 NULL, 0, &nd6_nd_domain.nd_maxnudhint, 0, 3033 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3034 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 3035 sysctl_createv(clog, 0, NULL, NULL, 3036 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3037 CTLTYPE_INT, "maxqueuelen", 3038 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3039 NULL, 1, &nd6_nd_domain.nd_maxqueuelen, 0, 3040 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3041 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3042 sysctl_createv(clog, 0, NULL, NULL, 3043 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3044 CTLTYPE_INT, "nd6_useloopback", 3045 SYSCTL_DESCR("Use loopback interface for local traffic"), 3046 NULL, 0, &nd6_useloopback, 0, 3047 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3048 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 3049 #if 0 /* obsoleted */ 3050 sysctl_createv(clog, 0, NULL, NULL, 3051 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3052 CTLTYPE_INT, "nd6_proxyall", NULL, 3053 NULL, 0, &nd6_proxyall, 0, 3054 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3055 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 3056 #endif 3057 sysctl_createv(clog, 0, NULL, NULL, 3058 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3059 CTLTYPE_INT, "nodeinfo", 3060 SYSCTL_DESCR("Respond to node information requests"), 3061 NULL, 0, &icmp6_nodeinfo, 0, 3062 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3063 ICMPV6CTL_NODEINFO, CTL_EOL); 3064 sysctl_createv(clog, 0, NULL, NULL, 3065 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3066 CTLTYPE_INT, "errppslimit", 3067 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 3068 NULL, 0, &icmp6errppslim, 0, 3069 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3070 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 3071 sysctl_createv(clog, 0, NULL, NULL, 3072 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3073 CTLTYPE_INT, "mtudisc_hiwat", 3074 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3075 NULL, 0, &icmp6_mtudisc_hiwat, 0, 3076 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3077 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 3078 sysctl_createv(clog, 0, NULL, NULL, 3079 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3080 CTLTYPE_INT, "mtudisc_lowat", 3081 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3082 NULL, 0, &icmp6_mtudisc_lowat, 0, 3083 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3084 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 3085 sysctl_createv(clog, 0, NULL, NULL, 3086 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3087 CTLTYPE_INT, "nd6_debug", 3088 SYSCTL_DESCR("Enable neighbor discovery debug output"), 3089 NULL, 0, &nd6_debug, 0, 3090 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3091 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 3092 #ifdef COMPAT_90 3093 sysctl_createv(clog, 0, NULL, NULL, 3094 CTLFLAG_PERMANENT, 3095 CTLTYPE_STRUCT, "nd6_drlist", 3096 SYSCTL_DESCR("Default router list"), 3097 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3098 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3099 OICMPV6CTL_ND6_DRLIST, CTL_EOL); 3100 sysctl_createv(clog, 0, NULL, NULL, 3101 CTLFLAG_PERMANENT, 3102 CTLTYPE_STRUCT, "nd6_prlist", 3103 SYSCTL_DESCR("Prefix list"), 3104 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3105 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3106 OICMPV6CTL_ND6_PRLIST, CTL_EOL); 3107 #endif 3108 } 3109 3110 void 3111 icmp6_statinc(u_int stat) 3112 { 3113 3114 KASSERT(stat < ICMP6_NSTATS); 3115 ICMP6_STATINC(stat); 3116 } 3117