1 /* $NetBSD: icmp6.c,v 1.246 2020/07/27 14:52:55 roy 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 1.246 2020/07/27 14:52:55 roy 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 91 #include <netinet/in.h> 92 #include <netinet/in_var.h> 93 #include <netinet/ip6.h> 94 #include <netinet/wqinput.h> 95 #include <netinet6/ip6_var.h> 96 #include <netinet6/ip6_private.h> 97 #include <netinet/icmp6.h> 98 #include <netinet6/icmp6_private.h> 99 #include <netinet6/mld6_var.h> 100 #include <netinet6/in6_pcb.h> 101 #include <netinet6/nd6.h> 102 #include <netinet6/in6_ifattach.h> 103 #include <netinet6/ip6protosw.h> 104 #include <netinet6/scope6_var.h> 105 106 #ifdef IPSEC 107 #include <netipsec/ipsec.h> 108 #include <netipsec/ipsec6.h> 109 #include <netipsec/key.h> 110 #endif 111 112 #include "faith.h" 113 #if defined(NFAITH) && 0 < NFAITH 114 #include <net/if_faith.h> 115 #endif 116 117 /* Ensure that non packed structures are the desired size. */ 118 __CTASSERT(sizeof(struct icmp6_hdr) == 8); 119 __CTASSERT(sizeof(struct icmp6_nodeinfo) == 16); 120 __CTASSERT(sizeof(struct icmp6_namelookup) == 20); 121 __CTASSERT(sizeof(struct icmp6_router_renum) == 16); 122 123 __CTASSERT(sizeof(struct nd_router_solicit) == 8); 124 __CTASSERT(sizeof(struct nd_router_advert) == 16); 125 __CTASSERT(sizeof(struct nd_neighbor_solicit) == 24); 126 __CTASSERT(sizeof(struct nd_neighbor_advert) == 24); 127 __CTASSERT(sizeof(struct nd_redirect) == 40); 128 __CTASSERT(sizeof(struct nd_opt_hdr) == 2); 129 __CTASSERT(sizeof(struct nd_opt_route_info) == 8); 130 __CTASSERT(sizeof(struct nd_opt_prefix_info) == 32); 131 __CTASSERT(sizeof(struct nd_opt_rd_hdr) == 8); 132 __CTASSERT(sizeof(struct nd_opt_mtu) == 8); 133 __CTASSERT(sizeof(struct nd_opt_nonce) == 2 + ND_OPT_NONCE_LEN); 134 __CTASSERT(sizeof(struct nd_opt_rdnss) == 8); 135 __CTASSERT(sizeof(struct nd_opt_dnssl) == 8); 136 137 __CTASSERT(sizeof(struct mld_hdr) == 24); 138 __CTASSERT(sizeof(struct ni_reply_fqdn) == 8); 139 __CTASSERT(sizeof(struct rr_pco_match) == 24); 140 __CTASSERT(sizeof(struct rr_pco_use) == 32); 141 __CTASSERT(sizeof(struct rr_result) == 24); 142 143 extern struct domain inet6domain; 144 145 percpu_t *icmp6stat_percpu; 146 147 extern struct inpcbtable raw6cbtable; 148 extern int icmp6errppslim; 149 static int icmp6errpps_count = 0; 150 static struct timeval icmp6errppslim_last; 151 extern int icmp6_nodeinfo; 152 153 /* 154 * List of callbacks to notify when Path MTU changes are made. 155 */ 156 struct icmp6_mtudisc_callback { 157 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 158 void (*mc_func)(struct in6_addr *); 159 }; 160 161 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 162 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 163 164 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 165 extern int pmtu_expire; 166 167 /* XXX do these values make any sense? */ 168 static int icmp6_mtudisc_hiwat = 1280; 169 static int icmp6_mtudisc_lowat = 256; 170 171 /* 172 * keep track of # of redirect routes. 173 */ 174 static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 175 176 /* XXX experimental, turned off */ 177 static int icmp6_redirect_hiwat = -1; 178 static int icmp6_redirect_lowat = -1; 179 180 /* Protect mtudisc and redirect stuffs */ 181 static kmutex_t icmp6_mtx __cacheline_aligned; 182 183 static void icmp6_errcount(u_int, int, int); 184 static int icmp6_rip6_input(struct mbuf **, int); 185 static void icmp6_reflect(struct mbuf *, size_t); 186 static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 187 static const char *icmp6_redirect_diag(char *, size_t, struct in6_addr *, 188 struct in6_addr *, struct in6_addr *); 189 static void icmp6_redirect_input(struct mbuf *, int); 190 static struct mbuf *ni6_input(struct mbuf *, int); 191 static struct mbuf *ni6_nametodns(const char *, int, int); 192 static int ni6_dnsmatch(const char *, int, const char *, int); 193 static int ni6_addrs(struct icmp6_nodeinfo *, struct ifnet **, char *, 194 struct psref *); 195 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 196 struct ifnet *, int); 197 static int icmp6_notify_error(struct mbuf *, int, int, int); 198 static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 199 static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 200 static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 201 static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 202 203 /* workqueue-based pr_input */ 204 static struct wqinput *icmp6_wqinput; 205 static void _icmp6_input(struct mbuf *m, int off, int proto); 206 207 void 208 icmp6_init(void) 209 { 210 211 sysctl_net_inet6_icmp6_setup(NULL); 212 mld_init(); 213 214 mutex_init(&icmp6_mtx, MUTEX_DEFAULT, IPL_NONE); 215 mutex_enter(&icmp6_mtx); 216 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 217 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 218 mutex_exit(&icmp6_mtx); 219 220 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS); 221 222 icmp6_wqinput = wqinput_create("icmp6", _icmp6_input); 223 } 224 225 static void 226 icmp6_errcount(u_int base, int type, int code) 227 { 228 switch (type) { 229 case ICMP6_DST_UNREACH: 230 switch (code) { 231 case ICMP6_DST_UNREACH_NOROUTE: 232 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE); 233 return; 234 case ICMP6_DST_UNREACH_ADMIN: 235 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN); 236 return; 237 case ICMP6_DST_UNREACH_BEYONDSCOPE: 238 ICMP6_STATINC(base + 239 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE); 240 return; 241 case ICMP6_DST_UNREACH_ADDR: 242 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR); 243 return; 244 case ICMP6_DST_UNREACH_NOPORT: 245 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT); 246 return; 247 } 248 break; 249 case ICMP6_PACKET_TOO_BIG: 250 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG); 251 return; 252 case ICMP6_TIME_EXCEEDED: 253 switch (code) { 254 case ICMP6_TIME_EXCEED_TRANSIT: 255 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT); 256 return; 257 case ICMP6_TIME_EXCEED_REASSEMBLY: 258 ICMP6_STATINC(base + 259 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY); 260 return; 261 } 262 break; 263 case ICMP6_PARAM_PROB: 264 switch (code) { 265 case ICMP6_PARAMPROB_HEADER: 266 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER); 267 return; 268 case ICMP6_PARAMPROB_NEXTHEADER: 269 ICMP6_STATINC(base + 270 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER); 271 return; 272 case ICMP6_PARAMPROB_OPTION: 273 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION); 274 return; 275 } 276 break; 277 case ND_REDIRECT: 278 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT); 279 return; 280 } 281 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN); 282 } 283 284 /* 285 * Register a Path MTU Discovery callback. 286 */ 287 void 288 icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *)) 289 { 290 struct icmp6_mtudisc_callback *mc, *new; 291 292 new = kmem_alloc(sizeof(*mc), KM_SLEEP); 293 294 mutex_enter(&icmp6_mtx); 295 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 296 mc = LIST_NEXT(mc, mc_list)) { 297 if (mc->mc_func == func) { 298 mutex_exit(&icmp6_mtx); 299 kmem_free(new, sizeof(*mc)); 300 return; 301 } 302 } 303 304 new->mc_func = func; 305 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, new, mc_list); 306 mutex_exit(&icmp6_mtx); 307 } 308 309 /* 310 * A wrapper function for icmp6_error() necessary when the erroneous packet 311 * may not contain enough scope zone information. 312 */ 313 void 314 icmp6_error2(struct mbuf *m, int type, int code, int param, 315 struct ifnet *ifp, struct in6_addr *src) 316 { 317 struct ip6_hdr *ip6; 318 319 KASSERT(ifp != NULL); 320 321 if (m->m_len < sizeof(struct ip6_hdr)) { 322 m = m_pullup(m, sizeof(struct ip6_hdr)); 323 if (m == NULL) 324 return; 325 } 326 327 ip6 = mtod(m, struct ip6_hdr *); 328 329 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 330 goto out; 331 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 332 goto out; 333 334 *src = ip6->ip6_src; 335 icmp6_error(m, type, code, param); 336 return; 337 338 out: 339 m_freem(m); 340 } 341 342 /* 343 * Generate an error packet of type error in response to bad IP6 packet. 344 */ 345 void 346 icmp6_error(struct mbuf *m, int type, int code, int param) 347 { 348 struct ip6_hdr *oip6, *nip6; 349 struct icmp6_hdr *icmp6; 350 u_int preplen; 351 int off; 352 int nxt; 353 354 ICMP6_STATINC(ICMP6_STAT_ERROR); 355 356 /* count per-type-code statistics */ 357 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); 358 359 if (m->m_flags & M_DECRYPTED) { 360 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 361 goto freeit; 362 } 363 364 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && 365 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) 366 return; 367 oip6 = mtod(m, struct ip6_hdr *); 368 369 /* 370 * If the destination address of the erroneous packet is a multicast 371 * address, or the packet was sent using link-layer multicast, 372 * we should basically suppress sending an error (RFC 2463, Section 373 * 2.4). 374 * We have two exceptions (the item e.2 in that section): 375 * - the Packet Too Big message can be sent for path MTU discovery. 376 * - the Parameter Problem Message that can be allowed an icmp6 error 377 * in the option type field. This check has been done in 378 * ip6_unknown_opt(), so we can just check the type and code. 379 */ 380 if ((m->m_flags & (M_BCAST|M_MCAST) || 381 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 382 (type != ICMP6_PACKET_TOO_BIG && 383 (type != ICMP6_PARAM_PROB || 384 code != ICMP6_PARAMPROB_OPTION))) 385 goto freeit; 386 387 /* 388 * RFC 2463, 2.4 (e.5): source address check. 389 * XXX: the case of anycast source? 390 */ 391 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 392 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 393 goto freeit; 394 395 /* 396 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 397 * don't do it. 398 */ 399 nxt = -1; 400 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 401 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 402 struct icmp6_hdr *icp; 403 404 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 405 sizeof(*icp)); 406 if (icp == NULL) { 407 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 408 return; 409 } 410 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 411 icp->icmp6_type == ND_REDIRECT) { 412 /* 413 * ICMPv6 error 414 * Special case: for redirect (which is 415 * informational) we must not send icmp6 error. 416 */ 417 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 418 goto freeit; 419 } else { 420 /* ICMPv6 informational - send the error */ 421 } 422 } else { 423 /* non-ICMPv6 - send the error */ 424 } 425 426 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 427 428 /* Finally, do rate limitation check. */ 429 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 430 ICMP6_STATINC(ICMP6_STAT_TOOFREQ); 431 goto freeit; 432 } 433 434 /* 435 * OK, ICMP6 can be generated. 436 */ 437 438 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 439 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 440 441 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 442 M_PREPEND(m, preplen, M_DONTWAIT); 443 if (m && M_UNWRITABLE(m, preplen)) 444 m = m_pullup(m, preplen); 445 if (m == NULL) { 446 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__); 447 return; 448 } 449 450 nip6 = mtod(m, struct ip6_hdr *); 451 nip6->ip6_src = oip6->ip6_src; 452 nip6->ip6_dst = oip6->ip6_dst; 453 454 in6_clearscope(&oip6->ip6_src); 455 in6_clearscope(&oip6->ip6_dst); 456 457 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 458 icmp6->icmp6_type = type; 459 icmp6->icmp6_code = code; 460 icmp6->icmp6_pptr = htonl((u_int32_t)param); 461 462 /* 463 * icmp6_reflect() is designed to be in the input path. 464 * icmp6_error() can be called from both input and output path, 465 * and if we are in output path rcvif could contain bogus value. 466 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 467 * information in ip header (nip6). 468 */ 469 m_reset_rcvif(m); 470 471 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 472 473 /* header order: IPv6 - ICMPv6 */ 474 icmp6_reflect(m, sizeof(struct ip6_hdr)); 475 476 return; 477 478 freeit: 479 /* 480 * If we can't tell whether or not we can generate ICMP6, free it. 481 */ 482 m_freem(m); 483 } 484 485 /* 486 * Process a received ICMP6 message. 487 */ 488 static void 489 _icmp6_input(struct mbuf *m, int off, int proto) 490 { 491 struct mbuf *n; 492 struct ip6_hdr *ip6, *nip6; 493 struct icmp6_hdr *icmp6, *nicmp6; 494 int icmp6len = m->m_pkthdr.len - off; 495 int code, sum; 496 struct ifnet *rcvif; 497 struct psref psref; 498 char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN]; 499 500 rcvif = m_get_rcvif_psref(m, &psref); 501 if (__predict_false(rcvif == NULL)) 502 goto freeit; 503 504 #define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 505 KASSERT(ICMP6_MAXLEN < MCLBYTES); 506 icmp6_ifstat_inc(rcvif, ifs6_in_msg); 507 508 /* 509 * Locate icmp6 structure in mbuf, and check 510 * that not corrupted and of at least minimum length 511 */ 512 513 if (icmp6len < sizeof(struct icmp6_hdr)) { 514 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 515 icmp6_ifstat_inc(rcvif, ifs6_in_error); 516 goto freeit; 517 } 518 519 if (m->m_len < sizeof(struct ip6_hdr)) { 520 m = m_pullup(m, sizeof(struct ip6_hdr)); 521 if (m == NULL) { 522 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 523 icmp6_ifstat_inc(rcvif, ifs6_in_error); 524 goto freeit; 525 } 526 } 527 528 ip6 = mtod(m, struct ip6_hdr *); 529 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 530 if (icmp6 == NULL) { 531 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 532 icmp6_ifstat_inc(rcvif, ifs6_in_error); 533 goto freeit; 534 } 535 536 /* 537 * Enforce alignment requirements that are violated in 538 * some cases, see kern/50766 for details. 539 */ 540 if (IP6_HDR_ALIGNED_P(icmp6) == 0) { 541 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0); 542 if (m == NULL) { 543 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 544 icmp6_ifstat_inc(rcvif, ifs6_in_error); 545 goto freeit; 546 } 547 ip6 = mtod(m, struct ip6_hdr *); 548 icmp6 = (struct icmp6_hdr *)(mtod(m, char *) + off); 549 } 550 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 551 552 /* 553 * calculate the checksum 554 */ 555 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 556 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 557 icmp6->icmp6_type, sum, IN6_PRINT(ip6buf, &ip6->ip6_src)); 558 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 559 icmp6_ifstat_inc(rcvif, ifs6_in_error); 560 goto freeit; 561 } 562 563 #if defined(NFAITH) && 0 < NFAITH 564 if (faithprefix(&ip6->ip6_dst)) { 565 /* 566 * Deliver very specific ICMP6 type only. 567 * This is important to deliver TOOBIG. Otherwise PMTUD 568 * will not work. 569 */ 570 switch (icmp6->icmp6_type) { 571 case ICMP6_DST_UNREACH: 572 case ICMP6_PACKET_TOO_BIG: 573 case ICMP6_TIME_EXCEEDED: 574 break; 575 default: 576 goto freeit; 577 } 578 } 579 #endif 580 581 code = icmp6->icmp6_code; 582 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 583 584 switch (icmp6->icmp6_type) { 585 case ICMP6_DST_UNREACH: 586 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 587 switch (code) { 588 case ICMP6_DST_UNREACH_NOROUTE: 589 code = PRC_UNREACH_NET; 590 break; 591 case ICMP6_DST_UNREACH_ADMIN: 592 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 593 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 594 break; 595 case ICMP6_DST_UNREACH_ADDR: 596 code = PRC_HOSTDEAD; 597 break; 598 case ICMP6_DST_UNREACH_BEYONDSCOPE: 599 /* I mean "source address was incorrect." */ 600 code = PRC_UNREACH_NET; 601 break; 602 case ICMP6_DST_UNREACH_NOPORT: 603 code = PRC_UNREACH_PORT; 604 break; 605 default: 606 goto badcode; 607 } 608 goto deliver; 609 610 case ICMP6_PACKET_TOO_BIG: 611 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 612 613 /* 614 * MTU is checked in icmp6_mtudisc. 615 */ 616 code = PRC_MSGSIZE; 617 618 /* 619 * Updating the path MTU will be done after examining 620 * intermediate extension headers. 621 */ 622 goto deliver; 623 624 case ICMP6_TIME_EXCEEDED: 625 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 626 switch (code) { 627 case ICMP6_TIME_EXCEED_TRANSIT: 628 code = PRC_TIMXCEED_INTRANS; 629 break; 630 case ICMP6_TIME_EXCEED_REASSEMBLY: 631 code = PRC_TIMXCEED_REASS; 632 break; 633 default: 634 goto badcode; 635 } 636 goto deliver; 637 638 case ICMP6_PARAM_PROB: 639 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 640 switch (code) { 641 case ICMP6_PARAMPROB_NEXTHEADER: 642 code = PRC_UNREACH_PROTOCOL; 643 break; 644 case ICMP6_PARAMPROB_HEADER: 645 case ICMP6_PARAMPROB_OPTION: 646 code = PRC_PARAMPROB; 647 break; 648 default: 649 goto badcode; 650 } 651 goto deliver; 652 653 case ICMP6_ECHO_REQUEST: 654 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 655 if (code != 0) 656 goto badcode; 657 /* 658 * Copy mbuf to send to two data paths: userland socket(s), 659 * and to the querier (echo reply). 660 * m: a copy for socket, n: a copy for querier 661 * 662 * If the first mbuf is shared, or the first mbuf is too short, 663 * copy the first part of the data into a fresh mbuf. 664 * Otherwise, we will wrongly overwrite both copies. 665 */ 666 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 667 /* Give up local */ 668 n = m; 669 m = NULL; 670 } else if (M_UNWRITABLE(n, off + sizeof(struct icmp6_hdr))) { 671 struct mbuf *n0 = n; 672 673 /* 674 * Prepare an internal mbuf. m_pullup() doesn't 675 * always copy the length we specified. 676 */ 677 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 678 /* Give up local */ 679 n = m; 680 m = NULL; 681 } 682 m_freem(n0); 683 } 684 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 685 sizeof(*nicmp6)); 686 if (nicmp6 == NULL) 687 goto freeit; 688 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 689 nicmp6->icmp6_code = 0; 690 if (n) { 691 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 692 icmp6s[ICMP6_STAT_REFLECT]++; 693 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 694 ICMP6_STAT_PUTREF(); 695 icmp6_reflect(n, off); 696 } 697 if (!m) 698 goto freeit; 699 break; 700 701 case ICMP6_ECHO_REPLY: 702 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 703 if (code != 0) 704 goto badcode; 705 break; 706 707 case MLD_LISTENER_QUERY: 708 case MLD_LISTENER_REPORT: 709 if (icmp6len < sizeof(struct mld_hdr)) 710 goto badlen; 711 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 712 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 713 else 714 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 715 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 716 /* give up local */ 717 mld_input(m, off); 718 m = NULL; 719 goto freeit; 720 } 721 mld_input(n, off); 722 /* m stays. */ 723 break; 724 725 case MLD_LISTENER_DONE: 726 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 727 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 728 goto badlen; 729 break; /* nothing to be done in kernel */ 730 731 case MLD_MTRACE_RESP: 732 case MLD_MTRACE: 733 /* XXX: these two are experimental. not officially defined. */ 734 /* XXX: per-interface statistics? */ 735 break; /* just pass it to applications */ 736 737 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 738 { 739 enum { WRU, FQDN } mode; 740 741 if (!icmp6_nodeinfo) 742 break; 743 744 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 745 mode = WRU; 746 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 747 mode = FQDN; 748 else 749 goto badlen; 750 751 if (mode == FQDN) { 752 n = m_copypacket(m, M_DONTWAIT); 753 if (n) 754 n = ni6_input(n, off); 755 } else { 756 u_char *p; 757 int maxhlen; 758 759 if ((icmp6_nodeinfo & 5) != 5) 760 break; 761 762 if (code != 0) 763 goto badcode; 764 MGETHDR(n, M_DONTWAIT, m->m_type); 765 if (n && ICMP6_MAXLEN > MHLEN) { 766 MCLGET(n, M_DONTWAIT); 767 if ((n->m_flags & M_EXT) == 0) { 768 m_free(n); 769 n = NULL; 770 } 771 } 772 if (n == NULL) { 773 /* Give up remote */ 774 break; 775 } 776 m_reset_rcvif(n); 777 n->m_len = 0; 778 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 779 if (maxhlen < 0) { 780 m_free(n); 781 break; 782 } 783 if (maxhlen > hostnamelen) 784 maxhlen = hostnamelen; 785 /* 786 * Copy IPv6 and ICMPv6 only. 787 */ 788 nip6 = mtod(n, struct ip6_hdr *); 789 memcpy(nip6, ip6, sizeof(struct ip6_hdr)); 790 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 791 memcpy(nicmp6, icmp6, sizeof(struct icmp6_hdr)); 792 793 p = (u_char *)(nicmp6 + 1); 794 memset(p, 0, 4); 795 memcpy(p + 4, hostname, maxhlen); /* meaningless TTL */ 796 797 m_copy_pkthdr(n, m); 798 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 799 sizeof(struct icmp6_hdr) + 4 + maxhlen; 800 nicmp6->icmp6_type = ICMP6_WRUREPLY; 801 nicmp6->icmp6_code = 0; 802 } 803 if (n) { 804 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 805 icmp6s[ICMP6_STAT_REFLECT]++; 806 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 807 ICMP6_STAT_PUTREF(); 808 icmp6_reflect(n, sizeof(struct ip6_hdr)); 809 } 810 break; 811 } 812 813 case ICMP6_WRUREPLY: 814 if (code != 0) 815 goto badcode; 816 break; 817 818 case ND_ROUTER_SOLICIT: 819 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 820 /* FALLTHROUGH */ 821 case ND_ROUTER_ADVERT: 822 if (icmp6->icmp6_type == ND_ROUTER_ADVERT) 823 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 824 if (code != 0) 825 goto badcode; 826 if ((icmp6->icmp6_type == ND_ROUTER_SOLICIT && 827 icmp6len < sizeof(struct nd_router_solicit)) || 828 (icmp6->icmp6_type == ND_ROUTER_ADVERT && 829 icmp6len < sizeof(struct nd_router_advert))) 830 goto badlen; 831 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 832 /* give up local */ 833 nd6_rtr_cache(m, off, icmp6len, icmp6->icmp6_type); 834 m = NULL; 835 goto freeit; 836 } 837 nd6_rtr_cache(n, off, icmp6len, icmp6->icmp6_type); 838 /* m stays. */ 839 break; 840 841 case ND_NEIGHBOR_SOLICIT: 842 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 843 if (code != 0) 844 goto badcode; 845 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 846 goto badlen; 847 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 848 /* give up local */ 849 nd6_ns_input(m, off, icmp6len); 850 m = NULL; 851 goto freeit; 852 } 853 nd6_ns_input(n, off, icmp6len); 854 /* m stays. */ 855 break; 856 857 case ND_NEIGHBOR_ADVERT: 858 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 859 if (code != 0) 860 goto badcode; 861 if (icmp6len < sizeof(struct nd_neighbor_advert)) 862 goto badlen; 863 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 864 /* give up local */ 865 nd6_na_input(m, off, icmp6len); 866 m = NULL; 867 goto freeit; 868 } 869 nd6_na_input(n, off, icmp6len); 870 /* m stays. */ 871 break; 872 873 case ND_REDIRECT: 874 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 875 if (code != 0) 876 goto badcode; 877 if (icmp6len < sizeof(struct nd_redirect)) 878 goto badlen; 879 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 880 /* give up local */ 881 icmp6_redirect_input(m, off); 882 m = NULL; 883 goto freeit; 884 } 885 icmp6_redirect_input(n, off); 886 /* m stays. */ 887 break; 888 889 case ICMP6_ROUTER_RENUMBERING: 890 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 891 code != ICMP6_ROUTER_RENUMBERING_RESULT) 892 goto badcode; 893 if (icmp6len < sizeof(struct icmp6_router_renum)) 894 goto badlen; 895 break; 896 897 default: 898 nd6log(LOG_DEBUG, 899 "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 900 icmp6->icmp6_type, 901 IN6_PRINT(ip6buf, &ip6->ip6_src), 902 IN6_PRINT(ip6buf2, &ip6->ip6_dst), 903 rcvif ? rcvif->if_index : 0); 904 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 905 /* ICMPv6 error: MUST deliver it by spec... */ 906 code = PRC_NCMDS; 907 /* deliver */ 908 } else { 909 /* ICMPv6 informational: MUST not deliver */ 910 break; 911 } 912 deliver: 913 if (icmp6_notify_error(m, off, icmp6len, code)) { 914 /* In this case, m should've been freed. */ 915 m_put_rcvif_psref(rcvif, &psref); 916 return; 917 } 918 break; 919 920 badcode: 921 ICMP6_STATINC(ICMP6_STAT_BADCODE); 922 break; 923 924 badlen: 925 ICMP6_STATINC(ICMP6_STAT_BADLEN); 926 break; 927 } 928 m_put_rcvif_psref(rcvif, &psref); 929 930 /* deliver the packet to appropriate sockets */ 931 icmp6_rip6_input(&m, off); 932 933 return; 934 935 freeit: 936 m_put_rcvif_psref(rcvif, &psref); 937 m_freem(m); 938 return; 939 } 940 941 int 942 icmp6_input(struct mbuf **mp, int *offp, int proto) 943 { 944 945 wqinput_input(icmp6_wqinput, *mp, *offp, proto); 946 947 return IPPROTO_DONE; 948 } 949 950 static int 951 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 952 { 953 struct icmp6_hdr *icmp6; 954 struct ip6_hdr *eip6; 955 u_int32_t notifymtu; 956 struct sockaddr_in6 icmp6src, icmp6dst; 957 958 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 959 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 960 goto freeit; 961 } 962 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 963 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 964 if (icmp6 == NULL) { 965 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 966 return (-1); 967 } 968 eip6 = (struct ip6_hdr *)(icmp6 + 1); 969 970 /* Detect the upper level protocol */ 971 { 972 void *(*ctlfunc)(int, const struct sockaddr *, void *); 973 u_int8_t nxt = eip6->ip6_nxt; 974 int eoff = off + sizeof(struct icmp6_hdr) + 975 sizeof(struct ip6_hdr); 976 struct ip6ctlparam ip6cp; 977 struct in6_addr *finaldst = NULL; 978 int icmp6type = icmp6->icmp6_type; 979 struct ip6_frag *fh; 980 struct ip6_rthdr *rth; 981 struct ifnet *rcvif; 982 int s; 983 984 while (1) { /* XXX: should avoid infinite loop explicitly? */ 985 struct ip6_ext *eh; 986 987 switch (nxt) { 988 case IPPROTO_HOPOPTS: 989 case IPPROTO_DSTOPTS: 990 case IPPROTO_AH: 991 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 992 eoff, sizeof(*eh)); 993 if (eh == NULL) { 994 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 995 return (-1); 996 } 997 998 if (nxt == IPPROTO_AH) 999 eoff += (eh->ip6e_len + 2) << 2; 1000 else 1001 eoff += (eh->ip6e_len + 1) << 3; 1002 nxt = eh->ip6e_nxt; 1003 break; 1004 case IPPROTO_ROUTING: 1005 /* Ignore the option. */ 1006 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 1007 eoff, sizeof(*rth)); 1008 if (rth == NULL) { 1009 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1010 return (-1); 1011 } 1012 1013 eoff += (rth->ip6r_len + 1) << 3; 1014 nxt = rth->ip6r_nxt; 1015 break; 1016 case IPPROTO_FRAGMENT: 1017 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1018 eoff, sizeof(*fh)); 1019 if (fh == NULL) { 1020 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1021 return (-1); 1022 } 1023 /* 1024 * Data after a fragment header is meaningless 1025 * unless it is the first fragment, but 1026 * we'll go to the notify label for path MTU 1027 * discovery. 1028 */ 1029 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1030 goto notify; 1031 1032 eoff += sizeof(struct ip6_frag); 1033 nxt = fh->ip6f_nxt; 1034 break; 1035 default: 1036 /* 1037 * This case includes ESP and the No Next 1038 * Header. In such cases going to the notify 1039 * label does not have any meaning 1040 * (i.e. ctlfunc will be NULL), but we go 1041 * anyway since we might have to update 1042 * path MTU information. 1043 */ 1044 goto notify; 1045 } 1046 } 1047 notify: 1048 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1049 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1050 if (icmp6 == NULL) { 1051 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1052 return (-1); 1053 } 1054 1055 /* 1056 * retrieve parameters from the inner IPv6 header, and convert 1057 * them into sockaddr structures. 1058 * XXX: there is no guarantee that the source or destination 1059 * addresses of the inner packet are in the same scope zone as 1060 * the addresses of the icmp packet. But there is no other 1061 * way to determine the zone. 1062 */ 1063 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1064 1065 rcvif = m_get_rcvif(m, &s); 1066 if (__predict_false(rcvif == NULL)) 1067 goto freeit; 1068 sockaddr_in6_init(&icmp6dst, 1069 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1070 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1071 m_put_rcvif(rcvif, &s); 1072 goto freeit; 1073 } 1074 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1075 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1076 m_put_rcvif(rcvif, &s); 1077 goto freeit; 1078 } 1079 m_put_rcvif(rcvif, &s); 1080 1081 icmp6src.sin6_flowinfo = 1082 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1083 1084 if (finaldst == NULL) 1085 finaldst = &eip6->ip6_dst; 1086 ip6cp.ip6c_m = m; 1087 ip6cp.ip6c_icmp6 = icmp6; 1088 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1089 ip6cp.ip6c_off = eoff; 1090 ip6cp.ip6c_finaldst = finaldst; 1091 ip6cp.ip6c_src = &icmp6src; 1092 ip6cp.ip6c_nxt = nxt; 1093 1094 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1095 notifymtu = ntohl(icmp6->icmp6_mtu); 1096 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1097 } 1098 1099 ctlfunc = inet6sw[ip6_protox[nxt]].pr_ctlinput; 1100 if (ctlfunc) { 1101 (void)(*ctlfunc)(code, sin6tosa(&icmp6dst), &ip6cp); 1102 } 1103 } 1104 return (0); 1105 1106 freeit: 1107 m_freem(m); 1108 return (-1); 1109 } 1110 1111 void 1112 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1113 { 1114 unsigned long rtcount; 1115 struct icmp6_mtudisc_callback *mc; 1116 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1117 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1118 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1119 u_int mtu = ntohl(icmp6->icmp6_mtu); 1120 struct rtentry *rt = NULL; 1121 struct sockaddr_in6 sin6; 1122 struct ifnet *rcvif; 1123 int s; 1124 1125 /* 1126 * The MTU should not be less than the minimal IPv6 MTU except for the 1127 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1128 * In that one case, the MTU might be less than 1280. 1129 */ 1130 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1131 /* is the mtu even sane? */ 1132 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1133 return; 1134 if (!validated) 1135 return; 1136 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1137 } 1138 1139 /* 1140 * allow non-validated cases if memory is plenty, to make traffic 1141 * from non-connected pcb happy. 1142 */ 1143 mutex_enter(&icmp6_mtx); 1144 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1145 if (validated) { 1146 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) { 1147 mutex_exit(&icmp6_mtx); 1148 return; 1149 } else if (0 <= icmp6_mtudisc_lowat && 1150 rtcount > icmp6_mtudisc_lowat) { 1151 /* 1152 * XXX nuke a victim, install the new one. 1153 */ 1154 } 1155 } else { 1156 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) { 1157 mutex_exit(&icmp6_mtx); 1158 return; 1159 } 1160 } 1161 mutex_exit(&icmp6_mtx); 1162 1163 memset(&sin6, 0, sizeof(sin6)); 1164 sin6.sin6_family = PF_INET6; 1165 sin6.sin6_len = sizeof(struct sockaddr_in6); 1166 sin6.sin6_addr = *dst; 1167 rcvif = m_get_rcvif(m, &s); 1168 if (__predict_false(rcvif == NULL)) 1169 return; 1170 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1171 m_put_rcvif(rcvif, &s); 1172 return; 1173 } 1174 m_put_rcvif(rcvif, &s); 1175 1176 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1177 1178 if (rt && (rt->rt_flags & RTF_HOST) && 1179 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1180 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1181 if (mtu < rt->rt_ifp->if_mtu) { 1182 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1183 rt->rt_rmx.rmx_mtu = mtu; 1184 } 1185 } 1186 if (rt) { 1187 rt_unref(rt); 1188 } 1189 1190 /* 1191 * Notify protocols that the MTU for this destination 1192 * has changed. 1193 */ 1194 mutex_enter(&icmp6_mtx); 1195 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1196 mc = LIST_NEXT(mc, mc_list)) 1197 (*mc->mc_func)(&sin6.sin6_addr); 1198 mutex_exit(&icmp6_mtx); 1199 } 1200 1201 /* 1202 * Process a Node Information Query packet, based on 1203 * draft-ietf-ipngwg-icmp-name-lookups-07. 1204 * 1205 * Spec incompatibilities: 1206 * - IPv6 Subject address handling 1207 * - IPv4 Subject address handling support missing 1208 * - Proxy reply (answer even if it's not for me) 1209 * - joins NI group address at in6_ifattach() time only, does not cope 1210 * with hostname changes by sethostname(3) 1211 */ 1212 static struct mbuf * 1213 ni6_input(struct mbuf *m, int off) 1214 { 1215 struct icmp6_nodeinfo *ni6, *nni6; 1216 struct mbuf *n = NULL; 1217 u_int16_t qtype; 1218 int subjlen; 1219 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1220 struct ni_reply_fqdn *fqdn; 1221 int addrs; /* for NI_QTYPE_NODEADDR */ 1222 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1223 struct sockaddr_in6 sin6; /* ip6_dst */ 1224 struct in6_addr in6_subj; /* subject address */ 1225 struct ip6_hdr *ip6; 1226 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1227 char *subj = NULL; 1228 struct ifnet *rcvif; 1229 int s, ss; 1230 struct ifaddr *ifa; 1231 struct psref psref; 1232 1233 ip6 = mtod(m, struct ip6_hdr *); 1234 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1235 if (ni6 == NULL) { 1236 /* m is already reclaimed */ 1237 return NULL; 1238 } 1239 KASSERT((m->m_flags & M_PKTHDR) != 0); 1240 1241 /* 1242 * Validate IPv6 destination address. 1243 * 1244 * The Responder must discard the Query without further processing 1245 * unless it is one of the Responder's unicast or anycast addresses, or 1246 * a link-local scope multicast address which the Responder has joined. 1247 * [icmp-name-lookups-07, Section 4.] 1248 */ 1249 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1250 /* XXX scopeid */ 1251 ss = pserialize_read_enter(); 1252 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1253 if (ifa != NULL) { 1254 ; /* unicast/anycast, fine */ 1255 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) { 1256 ; /* link-local multicast, fine */ 1257 } else { 1258 pserialize_read_exit(ss); 1259 goto bad; 1260 } 1261 pserialize_read_exit(ss); 1262 1263 /* validate query Subject field. */ 1264 qtype = ntohs(ni6->ni_qtype); 1265 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1266 switch (qtype) { 1267 case NI_QTYPE_NOOP: 1268 case NI_QTYPE_SUPTYPES: 1269 /* 07 draft */ 1270 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1271 break; 1272 /* FALLTHROUGH */ 1273 case NI_QTYPE_FQDN: 1274 case NI_QTYPE_NODEADDR: 1275 case NI_QTYPE_IPV4ADDR: 1276 switch (ni6->ni_code) { 1277 case ICMP6_NI_SUBJ_IPV6: 1278 #if ICMP6_NI_SUBJ_IPV6 != 0 1279 case 0: 1280 #endif 1281 /* 1282 * backward compatibility - try to accept 03 draft 1283 * format, where no Subject is present. 1284 */ 1285 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1286 subjlen == 0) { 1287 oldfqdn++; 1288 break; 1289 } 1290 #if ICMP6_NI_SUBJ_IPV6 != 0 1291 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1292 goto bad; 1293 #endif 1294 1295 if (subjlen != sizeof(sin6.sin6_addr)) 1296 goto bad; 1297 1298 /* 1299 * Validate Subject address. 1300 * 1301 * Not sure what exactly "address belongs to the node" 1302 * means in the spec, is it just unicast, or what? 1303 * 1304 * At this moment we consider Subject address as 1305 * "belong to the node" if the Subject address equals 1306 * to the IPv6 destination address; validation for 1307 * IPv6 destination address should have done enough 1308 * check for us. 1309 * 1310 * We do not do proxy at this moment. 1311 */ 1312 /* m_pulldown instead of copy? */ 1313 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1314 subjlen, (void *)&in6_subj); 1315 rcvif = m_get_rcvif(m, &s); 1316 if (__predict_false(rcvif == NULL)) 1317 goto bad; 1318 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1319 m_put_rcvif(rcvif, &s); 1320 goto bad; 1321 } 1322 m_put_rcvif(rcvif, &s); 1323 1324 subj = (char *)&in6_subj; 1325 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1326 break; 1327 1328 /* 1329 * XXX if we are to allow other cases, we should really 1330 * be careful about scope here. 1331 * basically, we should disallow queries toward IPv6 1332 * destination X with subject Y, if scope(X) > scope(Y). 1333 * if we allow scope(X) > scope(Y), it will result in 1334 * information leakage across scope boundary. 1335 */ 1336 goto bad; 1337 1338 case ICMP6_NI_SUBJ_FQDN: 1339 /* 1340 * Validate Subject name with gethostname(3). 1341 * 1342 * The behavior may need some debate, since: 1343 * - we are not sure if the node has FQDN as 1344 * hostname (returned by gethostname(3)). 1345 * - the code does wildcard match for truncated names. 1346 * however, we are not sure if we want to perform 1347 * wildcard match, if gethostname(3) side has 1348 * truncated hostname. 1349 */ 1350 n = ni6_nametodns(hostname, hostnamelen, 0); 1351 if (!n || n->m_next || n->m_len == 0) 1352 goto bad; 1353 IP6_EXTHDR_GET(subj, char *, m, 1354 off + sizeof(struct icmp6_nodeinfo), subjlen); 1355 if (subj == NULL) 1356 goto bad; 1357 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1358 n->m_len)) { 1359 goto bad; 1360 } 1361 m_freem(n); 1362 n = NULL; 1363 break; 1364 1365 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1366 default: 1367 goto bad; 1368 } 1369 break; 1370 } 1371 1372 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1373 switch (qtype) { 1374 case NI_QTYPE_FQDN: 1375 if ((icmp6_nodeinfo & 1) == 0) 1376 goto bad; 1377 break; 1378 case NI_QTYPE_NODEADDR: 1379 case NI_QTYPE_IPV4ADDR: 1380 if ((icmp6_nodeinfo & 2) == 0) 1381 goto bad; 1382 break; 1383 } 1384 1385 /* guess reply length */ 1386 switch (qtype) { 1387 case NI_QTYPE_NOOP: 1388 break; /* no reply data */ 1389 case NI_QTYPE_SUPTYPES: 1390 replylen += sizeof(u_int32_t); 1391 break; 1392 case NI_QTYPE_FQDN: 1393 /* will append an mbuf */ 1394 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1395 break; 1396 case NI_QTYPE_NODEADDR: 1397 addrs = ni6_addrs(ni6, &ifp, subj, &psref); 1398 replylen += addrs * 1399 (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1400 if (replylen > MCLBYTES) 1401 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1402 break; 1403 case NI_QTYPE_IPV4ADDR: 1404 /* unsupported - should respond with unknown Qtype? */ 1405 goto bad; 1406 default: 1407 /* 1408 * XXX: We must return a reply with the ICMP6 code 1409 * `unknown Qtype' in this case. However we regard the case 1410 * as an FQDN query for backward compatibility. 1411 * Older versions set a random value to this field, 1412 * so it rarely varies in the defined qtypes. 1413 * But the mechanism is not reliable... 1414 * maybe we should obsolete older versions. 1415 */ 1416 qtype = NI_QTYPE_FQDN; 1417 /* will append an mbuf */ 1418 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1419 oldfqdn++; 1420 break; 1421 } 1422 1423 /* allocate an mbuf to reply. */ 1424 MGETHDR(n, M_DONTWAIT, m->m_type); 1425 if (n == NULL) { 1426 goto bad; 1427 } 1428 m_move_pkthdr(n, m); 1429 if (replylen > MHLEN) { 1430 if (replylen > MCLBYTES) { 1431 /* 1432 * XXX: should we try to allocate more? But MCLBYTES 1433 * is probably much larger than IPV6_MMTU... 1434 */ 1435 goto bad; 1436 } 1437 MCLGET(n, M_DONTWAIT); 1438 if ((n->m_flags & M_EXT) == 0) { 1439 goto bad; 1440 } 1441 } 1442 n->m_pkthdr.len = n->m_len = replylen; 1443 1444 /* copy mbuf header and IPv6 + Node Information base headers */ 1445 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1446 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1447 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1448 1449 /* qtype dependent procedure */ 1450 switch (qtype) { 1451 case NI_QTYPE_NOOP: 1452 nni6->ni_code = ICMP6_NI_SUCCESS; 1453 nni6->ni_flags = 0; 1454 break; 1455 case NI_QTYPE_SUPTYPES: 1456 { 1457 u_int32_t v; 1458 nni6->ni_code = ICMP6_NI_SUCCESS; 1459 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1460 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1461 v = (u_int32_t)htonl(0x0000000f); 1462 memcpy(nni6 + 1, &v, sizeof(u_int32_t)); 1463 break; 1464 } 1465 case NI_QTYPE_FQDN: 1466 nni6->ni_code = ICMP6_NI_SUCCESS; 1467 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1468 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 1469 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1470 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1471 /* 1472 * XXX do we really have FQDN in variable "hostname"? 1473 */ 1474 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1475 if (n->m_next == NULL) 1476 goto bad; 1477 /* XXX we assume that n->m_next is not a chain */ 1478 if (n->m_next->m_next != NULL) 1479 goto bad; 1480 n->m_pkthdr.len += n->m_next->m_len; 1481 break; 1482 case NI_QTYPE_NODEADDR: 1483 { 1484 int lenlim, copied; 1485 1486 nni6->ni_code = ICMP6_NI_SUCCESS; 1487 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1488 sizeof(struct icmp6_nodeinfo); 1489 lenlim = M_TRAILINGSPACE(n); 1490 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1491 if_put(ifp, &psref); 1492 ifp = NULL; 1493 /* update mbuf length */ 1494 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1495 sizeof(struct icmp6_nodeinfo) + copied; 1496 break; 1497 } 1498 default: 1499 panic("%s: impossible", __func__); 1500 break; 1501 } 1502 1503 nni6->ni_type = ICMP6_NI_REPLY; 1504 m_freem(m); 1505 return n; 1506 1507 bad: 1508 if_put(ifp, &psref); 1509 m_freem(m); 1510 if (n) 1511 m_freem(n); 1512 return NULL; 1513 } 1514 1515 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1516 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1517 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1518 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1519 1520 /* 1521 * make a mbuf with DNS-encoded string. no compression support. 1522 * 1523 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1524 * treated as truncated name (two \0 at the end). this is a wild guess. 1525 * 1526 * old - return pascal string if non-zero 1527 */ 1528 static struct mbuf * 1529 ni6_nametodns(const char *name, int namelen, int old) 1530 { 1531 struct mbuf *m; 1532 char *cp, *ep; 1533 const char *p, *q; 1534 int i, len, nterm; 1535 1536 if (old) 1537 len = namelen + 1; 1538 else 1539 len = MCLBYTES; 1540 1541 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1542 MGET(m, M_DONTWAIT, MT_DATA); 1543 if (m && len > MLEN) { 1544 MCLGET(m, M_DONTWAIT); 1545 if ((m->m_flags & M_EXT) == 0) 1546 goto fail; 1547 } 1548 if (!m) 1549 goto fail; 1550 m->m_next = NULL; 1551 1552 if (old) { 1553 m->m_len = len; 1554 *mtod(m, char *) = namelen; 1555 memcpy(mtod(m, char *) + 1, name, namelen); 1556 return m; 1557 } else { 1558 m->m_len = 0; 1559 cp = mtod(m, char *); 1560 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1561 1562 /* if not certain about my name, return empty buffer */ 1563 if (namelen == 0) 1564 return m; 1565 1566 /* 1567 * guess if it looks like shortened hostname, or FQDN. 1568 * shortened hostname needs two trailing "\0". 1569 */ 1570 i = 0; 1571 for (p = name; p < name + namelen; p++) { 1572 if (*p == '.') 1573 i++; 1574 } 1575 if (i < 2) 1576 nterm = 2; 1577 else 1578 nterm = 1; 1579 1580 p = name; 1581 while (cp < ep && p < name + namelen) { 1582 i = 0; 1583 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1584 i++; 1585 /* result does not fit into mbuf */ 1586 if (cp + i + 1 >= ep) 1587 goto fail; 1588 /* 1589 * DNS label length restriction, RFC1035 page 8. 1590 * "i == 0" case is included here to avoid returning 1591 * 0-length label on "foo..bar". 1592 */ 1593 if (i <= 0 || i >= 64) 1594 goto fail; 1595 *cp++ = i; 1596 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1597 goto fail; 1598 while (i > 0) { 1599 if (!isalnum(*p) && *p != '-') 1600 goto fail; 1601 if (isupper(*p)) { 1602 *cp++ = tolower(*p); 1603 p++; 1604 } else 1605 *cp++ = *p++; 1606 i--; 1607 } 1608 p = q; 1609 if (p < name + namelen && *p == '.') 1610 p++; 1611 } 1612 /* termination */ 1613 if (cp + nterm >= ep) 1614 goto fail; 1615 while (nterm-- > 0) 1616 *cp++ = '\0'; 1617 m->m_len = cp - mtod(m, char *); 1618 return m; 1619 } 1620 1621 panic("should not reach here"); 1622 /* NOTREACHED */ 1623 1624 fail: 1625 if (m) 1626 m_freem(m); 1627 return NULL; 1628 } 1629 1630 /* 1631 * check if two DNS-encoded string matches. takes care of truncated 1632 * form (with \0\0 at the end). no compression support. 1633 * XXX upper/lowercase match (see RFC2065) 1634 */ 1635 static int 1636 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1637 { 1638 const char *a0, *b0; 1639 int l; 1640 1641 /* simplest case - need validation? */ 1642 if (alen == blen && memcmp(a, b, alen) == 0) 1643 return 1; 1644 1645 a0 = a; 1646 b0 = b; 1647 1648 /* termination is mandatory */ 1649 if (alen < 2 || blen < 2) 1650 return 0; 1651 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1652 return 0; 1653 alen--; 1654 blen--; 1655 1656 while (a - a0 < alen && b - b0 < blen) { 1657 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1658 return 0; 1659 1660 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1661 return 0; 1662 /* we don't support compression yet */ 1663 if (a[0] >= 64 || b[0] >= 64) 1664 return 0; 1665 1666 /* truncated case */ 1667 if (a[0] == 0 && a - a0 == alen - 1) 1668 return 1; 1669 if (b[0] == 0 && b - b0 == blen - 1) 1670 return 1; 1671 if (a[0] == 0 || b[0] == 0) 1672 return 0; 1673 1674 if (a[0] != b[0]) 1675 return 0; 1676 l = a[0]; 1677 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1678 return 0; 1679 if (memcmp(a + 1, b + 1, l) != 0) 1680 return 0; 1681 1682 a += 1 + l; 1683 b += 1 + l; 1684 } 1685 1686 if (a - a0 == alen && b - b0 == blen) 1687 return 1; 1688 else 1689 return 0; 1690 } 1691 1692 /* 1693 * calculate the number of addresses to be returned in the node info reply. 1694 */ 1695 static int 1696 ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj, 1697 struct psref *psref) 1698 { 1699 struct ifnet *ifp; 1700 struct in6_ifaddr *ia6; 1701 struct ifaddr *ifa; 1702 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1703 int addrs = 0, addrsofif, iffound = 0; 1704 int niflags = ni6->ni_flags; 1705 int s; 1706 1707 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1708 switch (ni6->ni_code) { 1709 case ICMP6_NI_SUBJ_IPV6: 1710 if (subj == NULL) /* must be impossible... */ 1711 return 0; 1712 subj_ip6 = (struct sockaddr_in6 *)subj; 1713 break; 1714 default: 1715 /* 1716 * XXX: we only support IPv6 subject address for 1717 * this Qtype. 1718 */ 1719 return 0; 1720 } 1721 } 1722 1723 s = pserialize_read_enter(); 1724 IFNET_READER_FOREACH(ifp) { 1725 addrsofif = 0; 1726 IFADDR_READER_FOREACH(ifa, ifp) { 1727 if (ifa->ifa_addr->sa_family != AF_INET6) 1728 continue; 1729 ia6 = (struct in6_ifaddr *)ifa; 1730 1731 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1732 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1733 &ia6->ia_addr.sin6_addr)) 1734 iffound = 1; 1735 1736 /* 1737 * IPv4-mapped addresses can only be returned by a 1738 * Node Information proxy, since they represent 1739 * addresses of IPv4-only nodes, which perforce do 1740 * not implement this protocol. 1741 * [icmp-name-lookups-07, Section 5.4] 1742 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1743 * this function at this moment. 1744 */ 1745 1746 /* What do we have to do about ::1? */ 1747 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1748 case IPV6_ADDR_SCOPE_LINKLOCAL: 1749 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1750 continue; 1751 break; 1752 case IPV6_ADDR_SCOPE_SITELOCAL: 1753 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1754 continue; 1755 break; 1756 case IPV6_ADDR_SCOPE_GLOBAL: 1757 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1758 continue; 1759 break; 1760 default: 1761 continue; 1762 } 1763 1764 /* 1765 * check if anycast is okay. 1766 * XXX: just experimental. not in the spec. 1767 */ 1768 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1769 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1770 continue; /* we need only unicast addresses */ 1771 1772 addrsofif++; /* count the address */ 1773 } 1774 if (iffound) { 1775 if_acquire(ifp, psref); 1776 pserialize_read_exit(s); 1777 *ifpp = ifp; 1778 return addrsofif; 1779 } 1780 1781 addrs += addrsofif; 1782 } 1783 pserialize_read_exit(s); 1784 1785 return addrs; 1786 } 1787 1788 static int 1789 ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1790 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1791 int resid) 1792 { 1793 struct ifnet *ifp; 1794 struct in6_ifaddr *ia6; 1795 struct ifaddr *ifa; 1796 struct ifnet *ifp_dep = NULL; 1797 int copied = 0, allow_deprecated = 0; 1798 u_char *cp = (u_char *)(nni6 + 1); 1799 int niflags = ni6->ni_flags; 1800 u_int32_t ltime; 1801 int s; 1802 1803 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1804 return 0; /* needless to copy */ 1805 1806 s = pserialize_read_enter(); 1807 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1808 again: 1809 1810 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1811 { 1812 IFADDR_READER_FOREACH(ifa, ifp) { 1813 if (ifa->ifa_addr->sa_family != AF_INET6) 1814 continue; 1815 ia6 = (struct in6_ifaddr *)ifa; 1816 1817 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1818 allow_deprecated == 0) { 1819 /* 1820 * prefererred address should be put before 1821 * deprecated addresses. 1822 */ 1823 1824 /* record the interface for later search */ 1825 if (ifp_dep == NULL) 1826 ifp_dep = ifp; 1827 1828 continue; 1829 } 1830 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1831 allow_deprecated != 0) 1832 continue; /* we now collect deprecated addrs */ 1833 1834 /* What do we have to do about ::1? */ 1835 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1836 case IPV6_ADDR_SCOPE_LINKLOCAL: 1837 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1838 continue; 1839 break; 1840 case IPV6_ADDR_SCOPE_SITELOCAL: 1841 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1842 continue; 1843 break; 1844 case IPV6_ADDR_SCOPE_GLOBAL: 1845 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1846 continue; 1847 break; 1848 default: 1849 continue; 1850 } 1851 1852 /* 1853 * check if anycast is okay. 1854 * XXX: just experimental. not in the spec. 1855 */ 1856 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1857 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1858 continue; 1859 1860 /* now we can copy the address */ 1861 if (resid < sizeof(struct in6_addr) + 1862 sizeof(u_int32_t)) { 1863 /* 1864 * We give up much more copy. 1865 * Set the truncate flag and return. 1866 */ 1867 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1868 goto out; 1869 } 1870 1871 /* 1872 * Set the TTL of the address. 1873 * The TTL value should be one of the following 1874 * according to the specification: 1875 * 1876 * 1. The remaining lifetime of a DHCP lease on the 1877 * address, or 1878 * 2. The remaining Valid Lifetime of a prefix from 1879 * which the address was derived through Stateless 1880 * Autoconfiguration. 1881 * 1882 * Note that we currently do not support stateful 1883 * address configuration by DHCPv6, so the former 1884 * case can't happen. 1885 * 1886 * TTL must be 2^31 > TTL >= 0. 1887 */ 1888 if (ia6->ia6_lifetime.ia6t_expire == 0) 1889 ltime = ND6_INFINITE_LIFETIME; 1890 else { 1891 if (ia6->ia6_lifetime.ia6t_expire > 1892 time_uptime) 1893 ltime = ia6->ia6_lifetime.ia6t_expire - 1894 time_uptime; 1895 else 1896 ltime = 0; 1897 } 1898 if (ltime > 0x7fffffff) 1899 ltime = 0x7fffffff; 1900 ltime = htonl(ltime); 1901 1902 memcpy(cp, <ime, sizeof(u_int32_t)); 1903 cp += sizeof(u_int32_t); 1904 1905 /* copy the address itself */ 1906 bcopy(&ia6->ia_addr.sin6_addr, cp, 1907 sizeof(struct in6_addr)); 1908 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1909 cp += sizeof(struct in6_addr); 1910 1911 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1912 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1913 } 1914 if (ifp0) /* we need search only on the specified IF */ 1915 break; 1916 } 1917 1918 if (allow_deprecated == 0 && ifp_dep != NULL) { 1919 ifp = ifp_dep; 1920 allow_deprecated = 1; 1921 1922 goto again; 1923 } 1924 out: 1925 pserialize_read_exit(s); 1926 return copied; 1927 } 1928 1929 /* 1930 * XXX almost dup'ed code with rip6_input. 1931 */ 1932 static int 1933 icmp6_rip6_input(struct mbuf **mp, int off) 1934 { 1935 struct mbuf *m = *mp; 1936 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1937 struct inpcb_hdr *inph; 1938 struct in6pcb *in6p; 1939 struct in6pcb *last = NULL; 1940 struct sockaddr_in6 rip6src; 1941 struct icmp6_hdr *icmp6; 1942 struct mbuf *n, *opts = NULL; 1943 1944 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1945 if (icmp6 == NULL) { 1946 /* m is already reclaimed */ 1947 return IPPROTO_DONE; 1948 } 1949 1950 /* 1951 * XXX: the address may have embedded scope zone ID, which should be 1952 * hidden from applications. 1953 */ 1954 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1955 if (sa6_recoverscope(&rip6src)) { 1956 m_freem(m); 1957 return IPPROTO_DONE; 1958 } 1959 1960 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1961 in6p = (struct in6pcb *)inph; 1962 if (in6p->in6p_af != AF_INET6) 1963 continue; 1964 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1965 continue; 1966 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1967 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1968 continue; 1969 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1970 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1971 continue; 1972 if (in6p->in6p_icmp6filt && 1973 ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1974 in6p->in6p_icmp6filt)) 1975 continue; 1976 1977 if (last == NULL) { 1978 ; 1979 } 1980 #ifdef IPSEC 1981 else if (ipsec_used && ipsec_in_reject(m, last)) { 1982 /* do not inject data into pcb */ 1983 } 1984 #endif 1985 else if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 1986 if (last->in6p_flags & IN6P_CONTROLOPTS) 1987 ip6_savecontrol(last, &opts, ip6, n); 1988 /* strip intermediate headers */ 1989 m_adj(n, off); 1990 if (sbappendaddr(&last->in6p_socket->so_rcv, 1991 sin6tosa(&rip6src), n, opts) == 0) { 1992 soroverflow(last->in6p_socket); 1993 m_freem(n); 1994 if (opts) 1995 m_freem(opts); 1996 } else { 1997 sorwakeup(last->in6p_socket); 1998 } 1999 opts = NULL; 2000 } 2001 2002 last = in6p; 2003 } 2004 2005 #ifdef IPSEC 2006 if (ipsec_used && last && ipsec_in_reject(m, last)) { 2007 m_freem(m); 2008 IP6_STATDEC(IP6_STAT_DELIVERED); 2009 /* do not inject data into pcb */ 2010 } else 2011 #endif 2012 if (last) { 2013 if (last->in6p_flags & IN6P_CONTROLOPTS) 2014 ip6_savecontrol(last, &opts, ip6, m); 2015 /* strip intermediate headers */ 2016 m_adj(m, off); 2017 if (sbappendaddr(&last->in6p_socket->so_rcv, 2018 sin6tosa(&rip6src), m, opts) == 0) { 2019 soroverflow(last->in6p_socket); 2020 m_freem(m); 2021 if (opts) 2022 m_freem(opts); 2023 } else { 2024 sorwakeup(last->in6p_socket); 2025 } 2026 } else { 2027 m_freem(m); 2028 IP6_STATDEC(IP6_STAT_DELIVERED); 2029 } 2030 return IPPROTO_DONE; 2031 } 2032 2033 /* 2034 * Reflect the ip6 packet back to the source. 2035 * OFF points to the icmp6 header, counted from the top of the mbuf. 2036 * 2037 * Note: RFC 1885 required that an echo reply should be truncated if it 2038 * did not fit in with (return) path MTU, and KAME code supported the 2039 * behavior. However, as a clarification after the RFC, this limitation 2040 * was removed in a revised version of the spec, RFC 2463. We had kept the 2041 * old behavior, with a (non-default) ifdef block, while the new version of 2042 * the spec was an internet-draft status, and even after the new RFC was 2043 * published. But it would rather make sense to clean the obsoleted part 2044 * up, and to make the code simpler at this stage. 2045 */ 2046 static void 2047 icmp6_reflect(struct mbuf *m, size_t off) 2048 { 2049 struct ip6_hdr *ip6; 2050 struct icmp6_hdr *icmp6; 2051 const struct in6_ifaddr *ia; 2052 const struct ip6aux *ip6a; 2053 int plen; 2054 int type, code; 2055 struct ifnet *outif = NULL; 2056 struct in6_addr origdst; 2057 struct ifnet *rcvif; 2058 int s; 2059 bool ip6_src_filled = false; 2060 2061 /* too short to reflect */ 2062 if (off < sizeof(struct ip6_hdr)) { 2063 nd6log(LOG_DEBUG, 2064 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2065 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2066 __FILE__, __LINE__); 2067 goto bad; 2068 } 2069 2070 /* 2071 * If there are extra headers between IPv6 and ICMPv6, strip 2072 * off that header first. 2073 */ 2074 CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN); 2075 if (off > sizeof(struct ip6_hdr)) { 2076 size_t l; 2077 struct ip6_hdr nip6; 2078 2079 l = off - sizeof(struct ip6_hdr); 2080 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2081 m_adj(m, l); 2082 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2083 if (m->m_len < l) { 2084 if ((m = m_pullup(m, l)) == NULL) 2085 return; 2086 } 2087 memcpy(mtod(m, void *), (void *)&nip6, sizeof(nip6)); 2088 } else { 2089 size_t l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2090 if (m->m_len < l) { 2091 if ((m = m_pullup(m, l)) == NULL) 2092 return; 2093 } 2094 } 2095 2096 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2097 ip6 = mtod(m, struct ip6_hdr *); 2098 ip6->ip6_nxt = IPPROTO_ICMPV6; 2099 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2100 type = icmp6->icmp6_type; /* keep type for statistics */ 2101 code = icmp6->icmp6_code; /* ditto. */ 2102 2103 origdst = ip6->ip6_dst; 2104 /* 2105 * ip6_input() drops a packet if its src is multicast. 2106 * So, the src is never multicast. 2107 */ 2108 ip6->ip6_dst = ip6->ip6_src; 2109 2110 /* 2111 * If the incoming packet was addressed directly to us (i.e. unicast), 2112 * use dst as the src for the reply. 2113 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2114 * (for example) when we encounter an error while forwarding procedure 2115 * destined to a duplicated address of ours. 2116 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2117 * procedure of an outgoing packet of our own, in which case we need 2118 * to search in the ifaddr list. 2119 */ 2120 if (IN6_IS_ADDR_MULTICAST(&origdst)) { 2121 ; 2122 } else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2123 if ((ip6a->ip6a_flags & 2124 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2125 ip6->ip6_src = ip6a->ip6a_src; 2126 ip6_src_filled = true; 2127 } 2128 } else { 2129 union { 2130 struct sockaddr_in6 sin6; 2131 struct sockaddr sa; 2132 } u; 2133 int _s; 2134 struct ifaddr *ifa; 2135 2136 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2137 2138 _s = pserialize_read_enter(); 2139 ifa = ifa_ifwithaddr(&u.sa); 2140 2141 if (ifa != NULL) { 2142 ia = ifatoia6(ifa); 2143 if ((ia->ia6_flags & 2144 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2145 ip6->ip6_src = ia->ia_addr.sin6_addr; 2146 ip6_src_filled = true; 2147 } 2148 } 2149 pserialize_read_exit(_s); 2150 } 2151 2152 if (!ip6_src_filled) { 2153 int e; 2154 struct sockaddr_in6 sin6; 2155 struct route ro; 2156 2157 /* 2158 * This case matches to multicasts, our anycast, or unicasts 2159 * that we do not own. Select a source address based on the 2160 * source address of the erroneous packet. 2161 */ 2162 /* zone ID should be embedded */ 2163 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2164 2165 memset(&ro, 0, sizeof(ro)); 2166 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2167 &ip6->ip6_src); 2168 rtcache_free(&ro); 2169 if (e != 0) { 2170 char ip6buf[INET6_ADDRSTRLEN]; 2171 nd6log(LOG_DEBUG, 2172 "source can't be determined: " 2173 "dst=%s, error=%d\n", 2174 IN6_PRINT(ip6buf, &sin6.sin6_addr), e); 2175 goto bad; 2176 } 2177 } 2178 2179 ip6->ip6_flow = 0; 2180 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2181 ip6->ip6_vfc |= IPV6_VERSION; 2182 ip6->ip6_nxt = IPPROTO_ICMPV6; 2183 rcvif = m_get_rcvif(m, &s); 2184 if (rcvif) { 2185 /* XXX: This may not be the outgoing interface */ 2186 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2187 } else { 2188 ip6->ip6_hlim = ip6_defhlim; 2189 } 2190 m_put_rcvif(rcvif, &s); 2191 2192 m->m_pkthdr.csum_flags = 0; 2193 icmp6->icmp6_cksum = 0; 2194 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2195 sizeof(struct ip6_hdr), plen); 2196 2197 /* 2198 * XXX option handling 2199 */ 2200 2201 m->m_flags &= ~(M_BCAST|M_MCAST); 2202 2203 /* 2204 * To avoid a "too big" situation at an intermediate router 2205 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2206 * Note that only echo and node information replies are affected, 2207 * since the length of ICMP6 errors is limited to the minimum MTU. 2208 */ 2209 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) != 0 && 2210 outif) 2211 icmp6_ifstat_inc(outif, ifs6_out_error); 2212 if (outif) 2213 icmp6_ifoutstat_inc(outif, type, code); 2214 2215 return; 2216 2217 bad: 2218 m_freem(m); 2219 return; 2220 } 2221 2222 static const char * 2223 icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6, 2224 struct in6_addr *dst6, struct in6_addr *tgt6) 2225 { 2226 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 2227 char ip6buft[INET6_ADDRSTRLEN]; 2228 2229 snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)", 2230 IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6), 2231 IN6_PRINT(ip6buft, tgt6)); 2232 return buf; 2233 } 2234 2235 static void 2236 icmp6_redirect_input(struct mbuf *m, int off) 2237 { 2238 struct ifnet *ifp; 2239 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2240 struct nd_redirect *nd_rd; 2241 int icmp6len = m->m_pkthdr.len - off; 2242 char *lladdr = NULL; 2243 int lladdrlen = 0; 2244 struct rtentry *rt = NULL; 2245 int is_router; 2246 int is_onlink; 2247 struct in6_addr src6 = ip6->ip6_src; 2248 struct in6_addr redtgt6; 2249 struct in6_addr reddst6; 2250 union nd_opts ndopts; 2251 struct psref psref; 2252 char ip6buf[INET6_ADDRSTRLEN]; 2253 char diagbuf[256]; 2254 2255 ifp = m_get_rcvif_psref(m, &psref); 2256 if (ifp == NULL) 2257 goto freeit; 2258 2259 /* XXX if we are router, we don't update route by icmp6 redirect */ 2260 if (ip6_forwarding) 2261 goto freeit; 2262 if (!icmp6_rediraccept) 2263 goto freeit; 2264 2265 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2266 if (nd_rd == NULL) { 2267 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2268 m_put_rcvif_psref(ifp, &psref); 2269 return; 2270 } 2271 redtgt6 = nd_rd->nd_rd_target; 2272 reddst6 = nd_rd->nd_rd_dst; 2273 2274 if (in6_setscope(&redtgt6, ifp, NULL) || 2275 in6_setscope(&reddst6, ifp, NULL)) { 2276 goto freeit; 2277 } 2278 2279 /* validation */ 2280 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2281 nd6log(LOG_ERR, 2282 "ICMP6 redirect sent from %s rejected; " 2283 "must be from linklocal\n", IN6_PRINT(ip6buf, &src6)); 2284 goto bad; 2285 } 2286 if (ip6->ip6_hlim != 255) { 2287 nd6log(LOG_ERR, 2288 "ICMP6 redirect sent from %s rejected; " 2289 "hlim=%d (must be 255)\n", 2290 IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim); 2291 goto bad; 2292 } 2293 2294 { 2295 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2296 struct sockaddr_in6 sin6; 2297 struct in6_addr *gw6; 2298 2299 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2300 rt = rtalloc1(sin6tosa(&sin6), 0); 2301 if (rt) { 2302 if (rt->rt_gateway == NULL || 2303 rt->rt_gateway->sa_family != AF_INET6) { 2304 nd6log(LOG_ERR, 2305 "ICMP6 redirect rejected; no route " 2306 "with inet6 gateway found for redirect dst: %s\n", 2307 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2308 &src6, &reddst6, &redtgt6)); 2309 rt_unref(rt); 2310 goto bad; 2311 } 2312 2313 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2314 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2315 nd6log(LOG_ERR, 2316 "ICMP6 redirect rejected; " 2317 "not equal to gw-for-src=%s (must be same): %s\n", 2318 IN6_PRINT(ip6buf, gw6), 2319 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2320 &src6, &reddst6, &redtgt6)); 2321 rt_unref(rt); 2322 goto bad; 2323 } 2324 } else { 2325 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2326 "no route found for redirect dst: %s\n", 2327 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2328 &src6, &reddst6, &redtgt6)); 2329 goto bad; 2330 } 2331 rt_unref(rt); 2332 rt = NULL; 2333 } 2334 2335 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2336 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2337 "redirect dst must be unicast: %s\n", 2338 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2339 &src6, &reddst6, &redtgt6)); 2340 goto bad; 2341 } 2342 2343 is_router = is_onlink = 0; 2344 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2345 is_router = 1; /* router case */ 2346 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2347 is_onlink = 1; /* on-link destination case */ 2348 if (!is_router && !is_onlink) { 2349 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2350 "neither router case nor onlink case: %s\n", 2351 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2352 &src6, &reddst6, &redtgt6)); 2353 goto bad; 2354 } 2355 /* validation passed */ 2356 2357 icmp6len -= sizeof(*nd_rd); 2358 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2359 if (nd6_options(&ndopts) < 0) { 2360 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2361 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2362 &src6, &reddst6, &redtgt6)); 2363 /* nd6_options have incremented stats */ 2364 goto freeit; 2365 } 2366 2367 if (ndopts.nd_opts_tgt_lladdr) { 2368 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2369 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2370 } 2371 2372 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2373 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2374 "(if %d, icmp6 packet %d): %s\n", 2375 IN6_PRINT(ip6buf, &redtgt6), 2376 ifp->if_addrlen, lladdrlen - 2, 2377 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2378 &src6, &reddst6, &redtgt6)); 2379 goto bad; 2380 } 2381 2382 /* RFC 2461 8.3 */ 2383 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2384 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2385 2386 m_put_rcvif_psref(ifp, &psref); 2387 ifp = NULL; 2388 2389 if (!is_onlink) { /* better router case. perform rtredirect. */ 2390 /* perform rtredirect */ 2391 struct sockaddr_in6 sdst; 2392 struct sockaddr_in6 sgw; 2393 struct sockaddr_in6 ssrc; 2394 unsigned long rtcount; 2395 struct rtentry *newrt = NULL; 2396 2397 /* 2398 * do not install redirect route, if the number of entries 2399 * is too much (> hiwat). note that, the node (= host) will 2400 * work just fine even if we do not install redirect route 2401 * (there will be additional hops, though). 2402 */ 2403 mutex_enter(&icmp6_mtx); 2404 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2405 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) { 2406 mutex_exit(&icmp6_mtx); 2407 goto freeit; 2408 } 2409 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) { 2410 mutex_exit(&icmp6_mtx); 2411 goto freeit; 2412 } else if (0 <= icmp6_redirect_lowat && 2413 rtcount > icmp6_redirect_lowat) { 2414 /* 2415 * XXX nuke a victim, install the new one. 2416 */ 2417 } 2418 2419 memset(&sdst, 0, sizeof(sdst)); 2420 memset(&sgw, 0, sizeof(sgw)); 2421 memset(&ssrc, 0, sizeof(ssrc)); 2422 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2423 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2424 sizeof(struct sockaddr_in6); 2425 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2426 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2427 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2428 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2429 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), &newrt); 2430 2431 if (newrt) { 2432 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2433 icmp6_redirect_timeout_q); 2434 rt_unref(newrt); 2435 } 2436 mutex_exit(&icmp6_mtx); 2437 } 2438 /* finally update cached route in each socket via pfctlinput */ 2439 { 2440 struct sockaddr_in6 sdst; 2441 2442 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2443 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2444 #if defined(IPSEC) 2445 if (ipsec_used) 2446 key_sa_routechange(sin6tosa(&sdst)); 2447 #endif 2448 } 2449 2450 freeit: 2451 if (ifp != NULL) 2452 m_put_rcvif_psref(ifp, &psref); 2453 m_freem(m); 2454 return; 2455 2456 bad: 2457 m_put_rcvif_psref(ifp, &psref); 2458 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2459 m_freem(m); 2460 } 2461 2462 void 2463 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2464 { 2465 struct ifnet *ifp; /* my outgoing interface */ 2466 struct in6_addr *ifp_ll6; 2467 struct in6_addr *nexthop; 2468 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2469 struct mbuf *m = NULL; /* newly allocated one */ 2470 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2471 struct nd_redirect *nd_rd; 2472 size_t maxlen; 2473 u_char *p; 2474 struct sockaddr_in6 src_sa; 2475 2476 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2477 2478 /* if we are not router, we don't send icmp6 redirect */ 2479 if (!ip6_forwarding) 2480 goto fail; 2481 2482 /* sanity check */ 2483 KASSERT(m0 != NULL); 2484 KASSERT(rt != NULL); 2485 2486 ifp = rt->rt_ifp; 2487 2488 /* 2489 * Address check: 2490 * the source address must identify a neighbor, and 2491 * the destination address must not be a multicast address 2492 * [RFC 2461, sec 8.2] 2493 */ 2494 sip6 = mtod(m0, struct ip6_hdr *); 2495 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2496 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2497 goto fail; 2498 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2499 goto fail; /* what should we do here? */ 2500 2501 /* rate limit */ 2502 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2503 goto fail; 2504 2505 /* 2506 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2507 * we almost always ask for an mbuf cluster for simplicity. 2508 * (MHLEN < IPV6_MMTU is almost always true) 2509 */ 2510 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2511 if (m && IPV6_MMTU >= MHLEN) { 2512 #if IPV6_MMTU >= MCLBYTES 2513 MEXTMALLOC(m, IPV6_MMTU, M_NOWAIT); 2514 #else 2515 MCLGET(m, M_DONTWAIT); 2516 #endif 2517 } 2518 2519 if (!m) 2520 goto fail; 2521 m_reset_rcvif(m); 2522 m->m_len = 0; 2523 maxlen = M_TRAILINGSPACE(m); 2524 maxlen = uimin(IPV6_MMTU, maxlen); 2525 2526 /* just for safety */ 2527 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct nd_redirect) + 2528 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2529 goto fail; 2530 } 2531 2532 { 2533 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2534 struct in6_ifaddr *ia; 2535 int s = pserialize_read_enter(); 2536 if ((ia = in6ifa_ifpforlinklocal(ifp, 2537 IN6_IFF_NOTREADY| 2538 IN6_IFF_ANYCAST)) == NULL) { 2539 pserialize_read_exit(s); 2540 goto fail; 2541 } 2542 ifp_ll6 = &ia->ia_addr.sin6_addr; 2543 pserialize_read_exit(s); 2544 } 2545 2546 /* get ip6 linklocal address for the router. */ 2547 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2548 struct sockaddr_in6 *sin6; 2549 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2550 nexthop = &sin6->sin6_addr; 2551 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2552 nexthop = NULL; 2553 } else 2554 nexthop = NULL; 2555 2556 /* ip6 */ 2557 ip6 = mtod(m, struct ip6_hdr *); 2558 ip6->ip6_flow = 0; 2559 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2560 ip6->ip6_vfc |= IPV6_VERSION; 2561 /* ip6->ip6_plen will be set later */ 2562 ip6->ip6_nxt = IPPROTO_ICMPV6; 2563 ip6->ip6_hlim = 255; 2564 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2565 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2566 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2567 2568 /* ND Redirect */ 2569 nd_rd = (struct nd_redirect *)(ip6 + 1); 2570 nd_rd->nd_rd_type = ND_REDIRECT; 2571 nd_rd->nd_rd_code = 0; 2572 nd_rd->nd_rd_reserved = 0; 2573 if (rt->rt_flags & RTF_GATEWAY) { 2574 /* 2575 * nd_rd->nd_rd_target must be a link-local address in 2576 * better router cases. 2577 */ 2578 if (!nexthop) 2579 goto fail; 2580 bcopy(nexthop, &nd_rd->nd_rd_target, 2581 sizeof(nd_rd->nd_rd_target)); 2582 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2583 sizeof(nd_rd->nd_rd_dst)); 2584 } else { 2585 /* make sure redtgt == reddst */ 2586 nexthop = &sip6->ip6_dst; 2587 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2588 sizeof(nd_rd->nd_rd_target)); 2589 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2590 sizeof(nd_rd->nd_rd_dst)); 2591 } 2592 2593 p = (u_char *)(nd_rd + 1); 2594 2595 { 2596 /* target lladdr option */ 2597 struct llentry *ln = NULL; 2598 int len, pad; 2599 struct nd_opt_hdr *nd_opt; 2600 char *lladdr; 2601 2602 ln = nd6_lookup(nexthop, ifp, false); 2603 if (ln == NULL) 2604 goto nolladdropt; 2605 len = sizeof(*nd_opt) + ifp->if_addrlen; 2606 len = (len + 7) & ~7; /* round by 8 */ 2607 pad = len - (sizeof(*nd_opt) + ifp->if_addrlen); 2608 2609 /* safety check */ 2610 if (len + (p - (u_char *)ip6) > maxlen) { 2611 LLE_RUNLOCK(ln); 2612 goto nolladdropt; 2613 } 2614 2615 if (ln->la_flags & LLE_VALID) { 2616 nd_opt = (struct nd_opt_hdr *)p; 2617 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2618 nd_opt->nd_opt_len = len >> 3; 2619 lladdr = (char *)(nd_opt + 1); 2620 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2621 memset(lladdr + ifp->if_addrlen, 0, pad); 2622 p += len; 2623 } 2624 LLE_RUNLOCK(ln); 2625 } 2626 nolladdropt: 2627 2628 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2629 2630 /* just to be safe */ 2631 if (m0->m_flags & M_DECRYPTED) 2632 goto noredhdropt; 2633 if (p - (u_char *)ip6 > maxlen) 2634 goto noredhdropt; 2635 2636 { 2637 /* redirected header option */ 2638 int len; 2639 struct nd_opt_rd_hdr *nd_opt_rh; 2640 2641 /* 2642 * compute the maximum size for icmp6 redirect header option. 2643 * XXX room for auth header? 2644 */ 2645 len = maxlen - (p - (u_char *)ip6); 2646 len &= ~7; 2647 2648 if (len < sizeof(*nd_opt_rh)) { 2649 goto noredhdropt; 2650 } 2651 2652 /* 2653 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2654 * about padding/truncate rule for the original IP packet. 2655 * From the discussion on IPv6imp in Feb 1999, 2656 * the consensus was: 2657 * - "attach as much as possible" is the goal 2658 * - pad if not aligned (original size can be guessed by 2659 * original ip6 header) 2660 * Following code adds the padding if it is simple enough, 2661 * and truncates if not. 2662 */ 2663 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2664 /* not enough room, truncate */ 2665 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2666 m0->m_pkthdr.len); 2667 } else { 2668 /* 2669 * enough room, truncate if not aligned. 2670 * we don't pad here for simplicity. 2671 */ 2672 int extra; 2673 2674 extra = m0->m_pkthdr.len % 8; 2675 if (extra) { 2676 /* truncate */ 2677 m_adj(m0, -extra); 2678 } 2679 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2680 } 2681 2682 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2683 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2684 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2685 nd_opt_rh->nd_opt_rh_len = len >> 3; 2686 p += sizeof(*nd_opt_rh); 2687 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2688 2689 /* connect m0 to m */ 2690 m->m_pkthdr.len += m0->m_pkthdr.len; 2691 m_cat(m, m0); 2692 m0 = NULL; 2693 } 2694 noredhdropt: 2695 if (m0) { 2696 m_freem(m0); 2697 m0 = NULL; 2698 } 2699 2700 /* XXX: clear embedded link IDs in the inner header */ 2701 in6_clearscope(&sip6->ip6_src); 2702 in6_clearscope(&sip6->ip6_dst); 2703 in6_clearscope(&nd_rd->nd_rd_target); 2704 in6_clearscope(&nd_rd->nd_rd_dst); 2705 2706 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2707 2708 nd_rd->nd_rd_cksum = 0; 2709 nd_rd->nd_rd_cksum = 2710 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2711 2712 /* send the packet to outside... */ 2713 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2714 icmp6_ifstat_inc(ifp, ifs6_out_error); 2715 2716 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2717 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2718 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2719 2720 return; 2721 2722 fail: 2723 if (m) 2724 m_freem(m); 2725 if (m0) 2726 m_freem(m0); 2727 } 2728 2729 /* 2730 * ICMPv6 socket option processing. 2731 */ 2732 int 2733 icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2734 { 2735 int error = 0; 2736 struct in6pcb *in6p = sotoin6pcb(so); 2737 2738 if (sopt->sopt_level != IPPROTO_ICMPV6) 2739 return rip6_ctloutput(op, so, sopt); 2740 2741 switch (op) { 2742 case PRCO_SETOPT: 2743 switch (sopt->sopt_name) { 2744 case ICMP6_FILTER: 2745 { 2746 struct icmp6_filter fil; 2747 2748 error = sockopt_get(sopt, &fil, sizeof(fil)); 2749 if (error) 2750 break; 2751 memcpy(in6p->in6p_icmp6filt, &fil, 2752 sizeof(struct icmp6_filter)); 2753 error = 0; 2754 break; 2755 } 2756 2757 default: 2758 error = ENOPROTOOPT; 2759 break; 2760 } 2761 break; 2762 2763 case PRCO_GETOPT: 2764 switch (sopt->sopt_name) { 2765 case ICMP6_FILTER: 2766 { 2767 if (in6p->in6p_icmp6filt == NULL) { 2768 error = EINVAL; 2769 break; 2770 } 2771 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2772 sizeof(struct icmp6_filter)); 2773 break; 2774 } 2775 2776 default: 2777 error = ENOPROTOOPT; 2778 break; 2779 } 2780 break; 2781 } 2782 2783 return error; 2784 } 2785 2786 /* 2787 * Perform rate limit check. 2788 * Returns 0 if it is okay to send the icmp6 packet. 2789 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2790 * limitation. 2791 * 2792 * XXX per-destination/type check necessary? 2793 */ 2794 static int 2795 icmp6_ratelimit( 2796 const struct in6_addr *dst, /* not used at this moment */ 2797 const int type, /* not used at this moment */ 2798 const int code) /* not used at this moment */ 2799 { 2800 int ret; 2801 2802 ret = 0; /* okay to send */ 2803 2804 /* PPS limit */ 2805 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2806 icmp6errppslim)) { 2807 /* The packet is subject to rate limit */ 2808 ret++; 2809 } 2810 2811 return ret; 2812 } 2813 2814 static struct rtentry * 2815 icmp6_mtudisc_clone(struct sockaddr *dst) 2816 { 2817 struct rtentry *rt; 2818 int error; 2819 2820 rt = rtalloc1(dst, 1); 2821 if (rt == NULL) 2822 return NULL; 2823 2824 /* If we didn't get a host route, allocate one */ 2825 if ((rt->rt_flags & RTF_HOST) == 0) { 2826 struct rtentry *nrt; 2827 2828 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2829 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2830 if (error) { 2831 rt_unref(rt); 2832 return NULL; 2833 } 2834 nrt->rt_rmx = rt->rt_rmx; 2835 rt_unref(rt); 2836 rt = nrt; 2837 } 2838 2839 mutex_enter(&icmp6_mtx); 2840 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2841 icmp6_mtudisc_timeout_q); 2842 mutex_exit(&icmp6_mtx); 2843 2844 if (error) { 2845 rt_unref(rt); 2846 return NULL; 2847 } 2848 2849 return rt; /* caller need to call rtfree() */ 2850 } 2851 2852 static void 2853 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2854 { 2855 struct rtentry *retrt; 2856 2857 KASSERT(rt != NULL); 2858 rt_assert_referenced(rt); 2859 2860 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2861 (RTF_DYNAMIC | RTF_HOST)) { 2862 rtrequest(RTM_DELETE, rt_getkey(rt), 2863 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt); 2864 rt_unref(rt); 2865 rt_free(retrt); 2866 } else { 2867 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2868 rt->rt_rmx.rmx_mtu = 0; 2869 } 2870 } 2871 2872 static void 2873 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2874 { 2875 struct rtentry *retrt; 2876 2877 KASSERT(rt != NULL); 2878 rt_assert_referenced(rt); 2879 2880 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2881 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2882 rtrequest(RTM_DELETE, rt_getkey(rt), 2883 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt); 2884 rt_unref(rt); 2885 rt_free(retrt); 2886 } 2887 } 2888 2889 #ifdef COMPAT_90 2890 /* 2891 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2892 */ 2893 static int 2894 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2895 { 2896 (void)&name; 2897 (void)&l; 2898 (void)&oname; 2899 2900 if (namelen != 0) 2901 return (EINVAL); 2902 2903 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2904 /*XXXUNCONST*/ 2905 __UNCONST(newp), newlen)); 2906 } 2907 #endif 2908 2909 static int 2910 sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2911 { 2912 2913 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2914 } 2915 2916 static int 2917 sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2918 { 2919 int error, tmp; 2920 struct sysctlnode node; 2921 2922 mutex_enter(&icmp6_mtx); 2923 2924 node = *rnode; 2925 node.sysctl_data = &tmp; 2926 tmp = icmp6_redirtimeout; 2927 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2928 if (error || newp == NULL) 2929 goto out; 2930 if (tmp < 0) { 2931 error = EINVAL; 2932 goto out; 2933 } 2934 icmp6_redirtimeout = tmp; 2935 2936 if (icmp6_redirect_timeout_q != NULL) { 2937 if (icmp6_redirtimeout == 0) { 2938 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2939 } else { 2940 rt_timer_queue_change(icmp6_redirect_timeout_q, 2941 icmp6_redirtimeout); 2942 } 2943 } else if (icmp6_redirtimeout > 0) { 2944 icmp6_redirect_timeout_q = 2945 rt_timer_queue_create(icmp6_redirtimeout); 2946 } 2947 error = 0; 2948 out: 2949 mutex_exit(&icmp6_mtx); 2950 return error; 2951 } 2952 2953 static void 2954 sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2955 { 2956 extern int nd6_maxqueuelen; /* defined in nd6.c */ 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_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_umaxtries", 3017 SYSCTL_DESCR("Number of unicast discovery attempts"), 3018 NULL, 0, &nd6_umaxtries, 0, 3019 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3020 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 3021 sysctl_createv(clog, 0, NULL, NULL, 3022 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3023 CTLTYPE_INT, "nd6_mmaxtries", 3024 SYSCTL_DESCR("Number of multicast discovery attempts"), 3025 NULL, 0, &nd6_mmaxtries, 0, 3026 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3027 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 3028 sysctl_createv(clog, 0, NULL, NULL, 3029 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3030 CTLTYPE_INT, "nd6_useloopback", 3031 SYSCTL_DESCR("Use loopback interface for local traffic"), 3032 NULL, 0, &nd6_useloopback, 0, 3033 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3034 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 3035 #if 0 /* obsoleted */ 3036 sysctl_createv(clog, 0, NULL, NULL, 3037 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3038 CTLTYPE_INT, "nd6_proxyall", NULL, 3039 NULL, 0, &nd6_proxyall, 0, 3040 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3041 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 3042 #endif 3043 sysctl_createv(clog, 0, NULL, NULL, 3044 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3045 CTLTYPE_INT, "nodeinfo", 3046 SYSCTL_DESCR("Respond to node information requests"), 3047 NULL, 0, &icmp6_nodeinfo, 0, 3048 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3049 ICMPV6CTL_NODEINFO, CTL_EOL); 3050 sysctl_createv(clog, 0, NULL, NULL, 3051 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3052 CTLTYPE_INT, "errppslimit", 3053 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 3054 NULL, 0, &icmp6errppslim, 0, 3055 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3056 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 3057 sysctl_createv(clog, 0, NULL, NULL, 3058 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3059 CTLTYPE_INT, "nd6_maxnudhint", 3060 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 3061 NULL, 0, &nd6_maxnudhint, 0, 3062 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3063 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 3064 sysctl_createv(clog, 0, NULL, NULL, 3065 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3066 CTLTYPE_INT, "mtudisc_hiwat", 3067 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3068 NULL, 0, &icmp6_mtudisc_hiwat, 0, 3069 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3070 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 3071 sysctl_createv(clog, 0, NULL, NULL, 3072 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3073 CTLTYPE_INT, "mtudisc_lowat", 3074 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3075 NULL, 0, &icmp6_mtudisc_lowat, 0, 3076 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3077 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 3078 sysctl_createv(clog, 0, NULL, NULL, 3079 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3080 CTLTYPE_INT, "nd6_debug", 3081 SYSCTL_DESCR("Enable neighbor discovery debug output"), 3082 NULL, 0, &nd6_debug, 0, 3083 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3084 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 3085 #ifdef COMPAT_90 3086 sysctl_createv(clog, 0, NULL, NULL, 3087 CTLFLAG_PERMANENT, 3088 CTLTYPE_STRUCT, "nd6_drlist", 3089 SYSCTL_DESCR("Default router list"), 3090 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3091 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3092 OICMPV6CTL_ND6_DRLIST, CTL_EOL); 3093 sysctl_createv(clog, 0, NULL, NULL, 3094 CTLFLAG_PERMANENT, 3095 CTLTYPE_STRUCT, "nd6_prlist", 3096 SYSCTL_DESCR("Prefix list"), 3097 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3098 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3099 OICMPV6CTL_ND6_PRLIST, CTL_EOL); 3100 #endif 3101 sysctl_createv(clog, 0, NULL, NULL, 3102 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3103 CTLTYPE_INT, "maxqueuelen", 3104 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3105 NULL, 1, &nd6_maxqueuelen, 0, 3106 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3107 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3108 } 3109 3110 void 3111 icmp6_statinc(u_int stat) 3112 { 3113 3114 KASSERT(stat < ICMP6_NSTATS); 3115 ICMP6_STATINC(stat); 3116 } 3117