1 /* $NetBSD: icmp6.c,v 1.209 2017/02/13 07:18:20 ozaki-r Exp $ */ 2 /* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: icmp6.c,v 1.209 2017/02/13 07:18:20 ozaki-r Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_inet.h" 69 #include "opt_ipsec.h" 70 #endif 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/kmem.h> 75 #include <sys/mbuf.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/time.h> 80 #include <sys/kernel.h> 81 #include <sys/syslog.h> 82 #include <sys/domain.h> 83 #include <sys/sysctl.h> 84 85 #include <net/if.h> 86 #include <net/route.h> 87 #include <net/if_dl.h> 88 #include <net/if_types.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <netinet/ip6.h> 93 #include <netinet/wqinput.h> 94 #include <netinet6/ip6_var.h> 95 #include <netinet6/ip6_private.h> 96 #include <netinet/icmp6.h> 97 #include <netinet6/icmp6_private.h> 98 #include <netinet6/mld6_var.h> 99 #include <netinet6/in6_pcb.h> 100 #include <netinet6/nd6.h> 101 #include <netinet6/in6_ifattach.h> 102 #include <netinet6/ip6protosw.h> 103 #include <netinet6/scope6_var.h> 104 105 #ifdef IPSEC 106 #include <netipsec/ipsec.h> 107 #include <netipsec/key.h> 108 #endif 109 110 111 #include "faith.h" 112 #if defined(NFAITH) && 0 < NFAITH 113 #include <net/if_faith.h> 114 #endif 115 116 #include <net/net_osdep.h> 117 118 extern struct domain inet6domain; 119 120 percpu_t *icmp6stat_percpu; 121 122 extern struct inpcbtable raw6cbtable; 123 extern int icmp6errppslim; 124 static int icmp6errpps_count = 0; 125 static struct timeval icmp6errppslim_last; 126 extern int icmp6_nodeinfo; 127 128 /* 129 * List of callbacks to notify when Path MTU changes are made. 130 */ 131 struct icmp6_mtudisc_callback { 132 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 133 void (*mc_func)(struct in6_addr *); 134 }; 135 136 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 137 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 138 139 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 140 extern int pmtu_expire; 141 142 /* XXX do these values make any sense? */ 143 static int icmp6_mtudisc_hiwat = 1280; 144 static int icmp6_mtudisc_lowat = 256; 145 146 /* 147 * keep track of # of redirect routes. 148 */ 149 static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 150 151 /* XXX experimental, turned off */ 152 static int icmp6_redirect_hiwat = -1; 153 static int icmp6_redirect_lowat = -1; 154 155 /* Protect mtudisc and redirect stuffs */ 156 static kmutex_t icmp6_mtx __cacheline_aligned; 157 158 static void icmp6_errcount(u_int, int, int); 159 static int icmp6_rip6_input(struct mbuf **, int); 160 static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 161 static const char *icmp6_redirect_diag(char *, size_t, struct in6_addr *, 162 struct in6_addr *, struct in6_addr *); 163 static struct mbuf *ni6_input(struct mbuf *, int); 164 static struct mbuf *ni6_nametodns(const char *, int, int); 165 static int ni6_dnsmatch(const char *, int, const char *, int); 166 static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *, 167 struct ifnet **, char *, struct psref *); 168 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 169 struct ifnet *, int); 170 static int icmp6_notify_error(struct mbuf *, int, int, int); 171 static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 172 static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 173 static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 174 static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 175 176 /* workqueue-based pr_input */ 177 static struct wqinput *icmp6_wqinput; 178 static void _icmp6_input(struct mbuf *m, int off, int proto); 179 180 void 181 icmp6_init(void) 182 { 183 184 sysctl_net_inet6_icmp6_setup(NULL); 185 mld_init(); 186 187 mutex_init(&icmp6_mtx, MUTEX_DEFAULT, IPL_NONE); 188 mutex_enter(&icmp6_mtx); 189 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 190 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 191 mutex_exit(&icmp6_mtx); 192 193 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS); 194 195 icmp6_wqinput = wqinput_create("icmp6", _icmp6_input); 196 } 197 198 static void 199 icmp6_errcount(u_int base, int type, int code) 200 { 201 switch (type) { 202 case ICMP6_DST_UNREACH: 203 switch (code) { 204 case ICMP6_DST_UNREACH_NOROUTE: 205 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE); 206 return; 207 case ICMP6_DST_UNREACH_ADMIN: 208 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN); 209 return; 210 case ICMP6_DST_UNREACH_BEYONDSCOPE: 211 ICMP6_STATINC(base + 212 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE); 213 return; 214 case ICMP6_DST_UNREACH_ADDR: 215 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR); 216 return; 217 case ICMP6_DST_UNREACH_NOPORT: 218 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT); 219 return; 220 } 221 break; 222 case ICMP6_PACKET_TOO_BIG: 223 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG); 224 return; 225 case ICMP6_TIME_EXCEEDED: 226 switch (code) { 227 case ICMP6_TIME_EXCEED_TRANSIT: 228 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT); 229 return; 230 case ICMP6_TIME_EXCEED_REASSEMBLY: 231 ICMP6_STATINC(base + 232 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY); 233 return; 234 } 235 break; 236 case ICMP6_PARAM_PROB: 237 switch (code) { 238 case ICMP6_PARAMPROB_HEADER: 239 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER); 240 return; 241 case ICMP6_PARAMPROB_NEXTHEADER: 242 ICMP6_STATINC(base + 243 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER); 244 return; 245 case ICMP6_PARAMPROB_OPTION: 246 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION); 247 return; 248 } 249 break; 250 case ND_REDIRECT: 251 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT); 252 return; 253 } 254 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN); 255 } 256 257 /* 258 * Register a Path MTU Discovery callback. 259 */ 260 void 261 icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *)) 262 { 263 struct icmp6_mtudisc_callback *mc, *new; 264 265 new = kmem_alloc(sizeof(*mc), KM_SLEEP); 266 267 mutex_enter(&icmp6_mtx); 268 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 269 mc = LIST_NEXT(mc, mc_list)) { 270 if (mc->mc_func == func) { 271 mutex_exit(&icmp6_mtx); 272 kmem_free(new, sizeof(*mc)); 273 return; 274 } 275 } 276 277 new->mc_func = func; 278 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, new, mc_list); 279 mutex_exit(&icmp6_mtx); 280 } 281 282 /* 283 * A wrapper function for icmp6_error() necessary when the erroneous packet 284 * may not contain enough scope zone information. 285 */ 286 void 287 icmp6_error2(struct mbuf *m, int type, int code, int param, 288 struct ifnet *ifp) 289 { 290 struct ip6_hdr *ip6; 291 292 if (ifp == NULL) 293 return; 294 295 if (m->m_len < sizeof(struct ip6_hdr)) { 296 m = m_pullup(m, sizeof(struct ip6_hdr)); 297 if (m == NULL) 298 return; 299 } 300 301 ip6 = mtod(m, struct ip6_hdr *); 302 303 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 304 return; 305 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 306 return; 307 308 icmp6_error(m, type, code, param); 309 } 310 311 /* 312 * Generate an error packet of type error in response to bad IP6 packet. 313 */ 314 void 315 icmp6_error(struct mbuf *m, int type, int code, int param) 316 { 317 struct ip6_hdr *oip6, *nip6; 318 struct icmp6_hdr *icmp6; 319 u_int preplen; 320 int off; 321 int nxt; 322 323 ICMP6_STATINC(ICMP6_STAT_ERROR); 324 325 /* count per-type-code statistics */ 326 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); 327 328 if (m->m_flags & M_DECRYPTED) { 329 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 330 goto freeit; 331 } 332 333 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && 334 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) 335 return; 336 oip6 = mtod(m, struct ip6_hdr *); 337 338 /* 339 * If the destination address of the erroneous packet is a multicast 340 * address, or the packet was sent using link-layer multicast, 341 * we should basically suppress sending an error (RFC 2463, Section 342 * 2.4). 343 * We have two exceptions (the item e.2 in that section): 344 * - the Pakcet Too Big message can be sent for path MTU discovery. 345 * - the Parameter Problem Message that can be allowed an icmp6 error 346 * in the option type field. This check has been done in 347 * ip6_unknown_opt(), so we can just check the type and code. 348 */ 349 if ((m->m_flags & (M_BCAST|M_MCAST) || 350 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 351 (type != ICMP6_PACKET_TOO_BIG && 352 (type != ICMP6_PARAM_PROB || 353 code != ICMP6_PARAMPROB_OPTION))) 354 goto freeit; 355 356 /* 357 * RFC 2463, 2.4 (e.5): source address check. 358 * XXX: the case of anycast source? 359 */ 360 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 361 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 362 goto freeit; 363 364 /* 365 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 366 * don't do it. 367 */ 368 nxt = -1; 369 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 370 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 371 struct icmp6_hdr *icp; 372 373 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 374 sizeof(*icp)); 375 if (icp == NULL) { 376 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 377 return; 378 } 379 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 380 icp->icmp6_type == ND_REDIRECT) { 381 /* 382 * ICMPv6 error 383 * Special case: for redirect (which is 384 * informational) we must not send icmp6 error. 385 */ 386 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 387 goto freeit; 388 } else { 389 /* ICMPv6 informational - send the error */ 390 } 391 } 392 #if 0 /* controversial */ 393 else if (off >= 0 && nxt == IPPROTO_ESP) { 394 /* 395 * It could be ICMPv6 error inside ESP. Take a safer side, 396 * don't respond. 397 */ 398 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 399 goto freeit; 400 } 401 #endif 402 else { 403 /* non-ICMPv6 - send the error */ 404 } 405 406 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 407 408 /* Finally, do rate limitation check. */ 409 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 410 ICMP6_STATINC(ICMP6_STAT_TOOFREQ); 411 goto freeit; 412 } 413 414 /* 415 * OK, ICMP6 can be generated. 416 */ 417 418 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 419 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 420 421 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 422 M_PREPEND(m, preplen, M_DONTWAIT); 423 if (m && M_UNWRITABLE(m, preplen)) 424 m = m_pullup(m, preplen); 425 if (m == NULL) { 426 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__); 427 return; 428 } 429 430 nip6 = mtod(m, struct ip6_hdr *); 431 nip6->ip6_src = oip6->ip6_src; 432 nip6->ip6_dst = oip6->ip6_dst; 433 434 in6_clearscope(&oip6->ip6_src); 435 in6_clearscope(&oip6->ip6_dst); 436 437 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 438 icmp6->icmp6_type = type; 439 icmp6->icmp6_code = code; 440 icmp6->icmp6_pptr = htonl((u_int32_t)param); 441 442 /* 443 * icmp6_reflect() is designed to be in the input path. 444 * icmp6_error() can be called from both input and output path, 445 * and if we are in output path rcvif could contain bogus value. 446 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 447 * information in ip header (nip6). 448 */ 449 m_reset_rcvif(m); 450 451 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 452 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 453 454 return; 455 456 freeit: 457 /* 458 * If we can't tell whether or not we can generate ICMP6, free it. 459 */ 460 m_freem(m); 461 } 462 463 /* 464 * Process a received ICMP6 message. 465 */ 466 static void 467 _icmp6_input(struct mbuf *m, int off, int proto) 468 { 469 struct mbuf *n; 470 struct ip6_hdr *ip6, *nip6; 471 struct icmp6_hdr *icmp6, *nicmp6; 472 int icmp6len = m->m_pkthdr.len - off; 473 int code, sum, noff; 474 struct ifnet *rcvif; 475 struct psref psref; 476 char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN]; 477 478 rcvif = m_get_rcvif_psref(m, &psref); 479 if (__predict_false(rcvif == NULL)) 480 goto freeit; 481 482 #define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 483 KASSERT(ICMP6_MAXLEN < MCLBYTES); 484 icmp6_ifstat_inc(rcvif, ifs6_in_msg); 485 486 /* 487 * Locate icmp6 structure in mbuf, and check 488 * that not corrupted and of at least minimum length 489 */ 490 491 if (icmp6len < sizeof(struct icmp6_hdr)) { 492 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 493 icmp6_ifstat_inc(rcvif, ifs6_in_error); 494 goto freeit; 495 } 496 497 ip6 = mtod(m, struct ip6_hdr *); 498 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 499 if (icmp6 == NULL) { 500 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 501 icmp6_ifstat_inc(rcvif, ifs6_in_error); 502 goto freeit; 503 } 504 /* 505 * Enforce alignment requirements that are violated in 506 * some cases, see kern/50766 for details. 507 */ 508 if (IP6_HDR_ALIGNED_P(icmp6) == 0) { 509 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0); 510 if (m == NULL) { 511 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 512 icmp6_ifstat_inc(rcvif, ifs6_in_error); 513 goto freeit; 514 } 515 ip6 = mtod(m, struct ip6_hdr *); 516 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 517 } 518 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 519 520 /* 521 * calculate the checksum 522 */ 523 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 524 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 525 icmp6->icmp6_type, sum, IN6_PRINT(ip6buf, &ip6->ip6_src)); 526 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 527 icmp6_ifstat_inc(rcvif, ifs6_in_error); 528 goto freeit; 529 } 530 531 #if defined(NFAITH) && 0 < NFAITH 532 if (faithprefix(&ip6->ip6_dst)) { 533 /* 534 * Deliver very specific ICMP6 type only. 535 * This is important to deliver TOOBIG. Otherwise PMTUD 536 * will not work. 537 */ 538 switch (icmp6->icmp6_type) { 539 case ICMP6_DST_UNREACH: 540 case ICMP6_PACKET_TOO_BIG: 541 case ICMP6_TIME_EXCEEDED: 542 break; 543 default: 544 goto freeit; 545 } 546 } 547 #endif 548 549 code = icmp6->icmp6_code; 550 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 551 552 switch (icmp6->icmp6_type) { 553 case ICMP6_DST_UNREACH: 554 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 555 switch (code) { 556 case ICMP6_DST_UNREACH_NOROUTE: 557 code = PRC_UNREACH_NET; 558 break; 559 case ICMP6_DST_UNREACH_ADMIN: 560 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 561 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 562 break; 563 case ICMP6_DST_UNREACH_ADDR: 564 code = PRC_HOSTDEAD; 565 break; 566 #ifdef COMPAT_RFC1885 567 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 568 code = PRC_UNREACH_SRCFAIL; 569 break; 570 #else 571 case ICMP6_DST_UNREACH_BEYONDSCOPE: 572 /* I mean "source address was incorrect." */ 573 code = PRC_UNREACH_NET; 574 break; 575 #endif 576 case ICMP6_DST_UNREACH_NOPORT: 577 code = PRC_UNREACH_PORT; 578 break; 579 default: 580 goto badcode; 581 } 582 goto deliver; 583 584 case ICMP6_PACKET_TOO_BIG: 585 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 586 587 /* 588 * MTU is checked in icmp6_mtudisc. 589 */ 590 code = PRC_MSGSIZE; 591 592 /* 593 * Updating the path MTU will be done after examining 594 * intermediate extension headers. 595 */ 596 goto deliver; 597 598 case ICMP6_TIME_EXCEEDED: 599 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 600 switch (code) { 601 case ICMP6_TIME_EXCEED_TRANSIT: 602 code = PRC_TIMXCEED_INTRANS; 603 break; 604 case ICMP6_TIME_EXCEED_REASSEMBLY: 605 code = PRC_TIMXCEED_REASS; 606 break; 607 default: 608 goto badcode; 609 } 610 goto deliver; 611 612 case ICMP6_PARAM_PROB: 613 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 614 switch (code) { 615 case ICMP6_PARAMPROB_NEXTHEADER: 616 code = PRC_UNREACH_PROTOCOL; 617 break; 618 case ICMP6_PARAMPROB_HEADER: 619 case ICMP6_PARAMPROB_OPTION: 620 code = PRC_PARAMPROB; 621 break; 622 default: 623 goto badcode; 624 } 625 goto deliver; 626 627 case ICMP6_ECHO_REQUEST: 628 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 629 if (code != 0) 630 goto badcode; 631 /* 632 * Copy mbuf to send to two data paths: userland socket(s), 633 * and to the querier (echo reply). 634 * m: a copy for socket, n: a copy for querier 635 * 636 * If the first mbuf is shared, or the first mbuf is too short, 637 * copy the first part of the data into a fresh mbuf. 638 * Otherwise, we will wrongly overwrite both copies. 639 */ 640 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 641 /* Give up local */ 642 n = m; 643 m = NULL; 644 } else if (M_READONLY(n) || 645 n->m_len < off + sizeof(struct icmp6_hdr)) { 646 struct mbuf *n0 = n; 647 648 /* 649 * Prepare an internal mbuf. m_pullup() doesn't 650 * always copy the length we specified. 651 */ 652 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 653 /* Give up local */ 654 n = m; 655 m = NULL; 656 } 657 m_freem(n0); 658 } 659 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 660 sizeof(*nicmp6)); 661 if (nicmp6 == NULL) 662 goto freeit; 663 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 664 nicmp6->icmp6_code = 0; 665 if (n) { 666 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 667 icmp6s[ICMP6_STAT_REFLECT]++; 668 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 669 ICMP6_STAT_PUTREF(); 670 icmp6_reflect(n, off); 671 } 672 if (!m) 673 goto freeit; 674 break; 675 676 case ICMP6_ECHO_REPLY: 677 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 678 if (code != 0) 679 goto badcode; 680 break; 681 682 case MLD_LISTENER_QUERY: 683 case MLD_LISTENER_REPORT: 684 if (icmp6len < sizeof(struct mld_hdr)) 685 goto badlen; 686 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 687 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 688 else 689 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 690 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 691 /* give up local */ 692 mld_input(m, off); 693 m = NULL; 694 goto freeit; 695 } 696 mld_input(n, off); 697 /* m stays. */ 698 break; 699 700 case MLD_LISTENER_DONE: 701 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 702 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 703 goto badlen; 704 break; /* nothing to be done in kernel */ 705 706 case MLD_MTRACE_RESP: 707 case MLD_MTRACE: 708 /* XXX: these two are experimental. not officially defined. */ 709 /* XXX: per-interface statistics? */ 710 break; /* just pass it to applications */ 711 712 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 713 { 714 enum { WRU, FQDN } mode; 715 716 if (!icmp6_nodeinfo) 717 break; 718 719 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 720 mode = WRU; 721 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 722 mode = FQDN; 723 else 724 goto badlen; 725 726 if (mode == FQDN) { 727 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 728 if (n) 729 n = ni6_input(n, off); 730 /* XXX meaningless if n == NULL */ 731 noff = sizeof(struct ip6_hdr); 732 } else { 733 u_char *p; 734 int maxhlen; 735 736 if ((icmp6_nodeinfo & 5) != 5) 737 break; 738 739 if (code != 0) 740 goto badcode; 741 MGETHDR(n, M_DONTWAIT, m->m_type); 742 if (n && ICMP6_MAXLEN > MHLEN) { 743 MCLGET(n, M_DONTWAIT); 744 if ((n->m_flags & M_EXT) == 0) { 745 m_free(n); 746 n = NULL; 747 } 748 } 749 if (n == NULL) { 750 /* Give up remote */ 751 break; 752 } 753 m_reset_rcvif(n); 754 n->m_len = 0; 755 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 756 if (maxhlen < 0) 757 break; 758 if (maxhlen > hostnamelen) 759 maxhlen = hostnamelen; 760 /* 761 * Copy IPv6 and ICMPv6 only. 762 */ 763 nip6 = mtod(n, struct ip6_hdr *); 764 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 765 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 766 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 767 p = (u_char *)(nicmp6 + 1); 768 memset(p, 0, 4); 769 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 770 noff = sizeof(struct ip6_hdr); 771 M_COPY_PKTHDR(n, m); /* just for rcvif */ 772 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 773 sizeof(struct icmp6_hdr) + 4 + maxhlen; 774 nicmp6->icmp6_type = ICMP6_WRUREPLY; 775 nicmp6->icmp6_code = 0; 776 } 777 #undef hostnamelen 778 if (n) { 779 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 780 icmp6s[ICMP6_STAT_REFLECT]++; 781 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 782 ICMP6_STAT_PUTREF(); 783 icmp6_reflect(n, noff); 784 } 785 break; 786 } 787 788 case ICMP6_WRUREPLY: 789 if (code != 0) 790 goto badcode; 791 break; 792 793 case ND_ROUTER_SOLICIT: 794 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 795 if (code != 0) 796 goto badcode; 797 if (icmp6len < sizeof(struct nd_router_solicit)) 798 goto badlen; 799 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 800 /* give up local */ 801 nd6_rs_input(m, off, icmp6len); 802 m = NULL; 803 goto freeit; 804 } 805 nd6_rs_input(n, off, icmp6len); 806 /* m stays. */ 807 break; 808 809 case ND_ROUTER_ADVERT: 810 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 811 if (code != 0) 812 goto badcode; 813 if (icmp6len < sizeof(struct nd_router_advert)) 814 goto badlen; 815 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 816 /* give up local */ 817 nd6_ra_input(m, off, icmp6len); 818 m = NULL; 819 goto freeit; 820 } 821 nd6_ra_input(n, off, icmp6len); 822 /* m stays. */ 823 break; 824 825 case ND_NEIGHBOR_SOLICIT: 826 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 827 if (code != 0) 828 goto badcode; 829 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 830 goto badlen; 831 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 832 /* give up local */ 833 nd6_ns_input(m, off, icmp6len); 834 m = NULL; 835 goto freeit; 836 } 837 nd6_ns_input(n, off, icmp6len); 838 /* m stays. */ 839 break; 840 841 case ND_NEIGHBOR_ADVERT: 842 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 843 if (code != 0) 844 goto badcode; 845 if (icmp6len < sizeof(struct nd_neighbor_advert)) 846 goto badlen; 847 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 848 /* give up local */ 849 nd6_na_input(m, off, icmp6len); 850 m = NULL; 851 goto freeit; 852 } 853 nd6_na_input(n, off, icmp6len); 854 /* m stays. */ 855 break; 856 857 case ND_REDIRECT: 858 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 859 if (code != 0) 860 goto badcode; 861 if (icmp6len < sizeof(struct nd_redirect)) 862 goto badlen; 863 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 864 /* give up local */ 865 icmp6_redirect_input(m, off); 866 m = NULL; 867 goto freeit; 868 } 869 icmp6_redirect_input(n, off); 870 /* m stays. */ 871 break; 872 873 case ICMP6_ROUTER_RENUMBERING: 874 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 875 code != ICMP6_ROUTER_RENUMBERING_RESULT) 876 goto badcode; 877 if (icmp6len < sizeof(struct icmp6_router_renum)) 878 goto badlen; 879 break; 880 881 default: 882 nd6log(LOG_DEBUG, 883 "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 884 icmp6->icmp6_type, 885 IN6_PRINT(ip6buf, &ip6->ip6_src), 886 IN6_PRINT(ip6buf2, &ip6->ip6_dst), 887 rcvif ? rcvif->if_index : 0); 888 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 889 /* ICMPv6 error: MUST deliver it by spec... */ 890 code = PRC_NCMDS; 891 /* deliver */ 892 } else { 893 /* ICMPv6 informational: MUST not deliver */ 894 break; 895 } 896 deliver: 897 if (icmp6_notify_error(m, off, icmp6len, code)) { 898 /* In this case, m should've been freed. */ 899 m_put_rcvif_psref(rcvif, &psref); 900 return; 901 } 902 break; 903 904 badcode: 905 ICMP6_STATINC(ICMP6_STAT_BADCODE); 906 break; 907 908 badlen: 909 ICMP6_STATINC(ICMP6_STAT_BADLEN); 910 break; 911 } 912 m_put_rcvif_psref(rcvif, &psref); 913 914 /* deliver the packet to appropriate sockets */ 915 icmp6_rip6_input(&m, off); 916 917 return; 918 919 freeit: 920 m_put_rcvif_psref(rcvif, &psref); 921 m_freem(m); 922 return; 923 } 924 925 int 926 icmp6_input(struct mbuf **mp, int *offp, int proto) 927 { 928 929 wqinput_input(icmp6_wqinput, *mp, *offp, proto); 930 931 return IPPROTO_DONE; 932 } 933 934 static int 935 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 936 { 937 struct icmp6_hdr *icmp6; 938 struct ip6_hdr *eip6; 939 u_int32_t notifymtu; 940 struct sockaddr_in6 icmp6src, icmp6dst; 941 942 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 943 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 944 goto freeit; 945 } 946 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 947 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 948 if (icmp6 == NULL) { 949 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 950 return (-1); 951 } 952 eip6 = (struct ip6_hdr *)(icmp6 + 1); 953 954 /* Detect the upper level protocol */ 955 { 956 void (*ctlfunc)(int, struct sockaddr *, void *); 957 u_int8_t nxt = eip6->ip6_nxt; 958 int eoff = off + sizeof(struct icmp6_hdr) + 959 sizeof(struct ip6_hdr); 960 struct ip6ctlparam ip6cp; 961 struct in6_addr *finaldst = NULL; 962 int icmp6type = icmp6->icmp6_type; 963 struct ip6_frag *fh; 964 struct ip6_rthdr *rth; 965 struct ip6_rthdr0 *rth0; 966 int rthlen; 967 struct ifnet *rcvif; 968 int s; 969 970 while (1) { /* XXX: should avoid infinite loop explicitly? */ 971 struct ip6_ext *eh; 972 973 switch (nxt) { 974 case IPPROTO_HOPOPTS: 975 case IPPROTO_DSTOPTS: 976 case IPPROTO_AH: 977 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 978 eoff, sizeof(*eh)); 979 if (eh == NULL) { 980 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 981 return (-1); 982 } 983 984 if (nxt == IPPROTO_AH) 985 eoff += (eh->ip6e_len + 2) << 2; 986 else 987 eoff += (eh->ip6e_len + 1) << 3; 988 nxt = eh->ip6e_nxt; 989 break; 990 case IPPROTO_ROUTING: 991 /* 992 * When the erroneous packet contains a 993 * routing header, we should examine the 994 * header to determine the final destination. 995 * Otherwise, we can't properly update 996 * information that depends on the final 997 * destination (e.g. path MTU). 998 */ 999 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 1000 eoff, sizeof(*rth)); 1001 if (rth == NULL) { 1002 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1003 return (-1); 1004 } 1005 rthlen = (rth->ip6r_len + 1) << 3; 1006 /* 1007 * XXX: currently there is no 1008 * officially defined type other 1009 * than type-0. 1010 * Note that if the segment left field 1011 * is 0, all intermediate hops must 1012 * have been passed. 1013 */ 1014 if (rth->ip6r_segleft && 1015 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 1016 int hops; 1017 1018 IP6_EXTHDR_GET(rth0, 1019 struct ip6_rthdr0 *, m, 1020 eoff, rthlen); 1021 if (rth0 == NULL) { 1022 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1023 return (-1); 1024 } 1025 /* just ignore a bogus header */ 1026 if ((rth0->ip6r0_len % 2) == 0 && 1027 (hops = rth0->ip6r0_len/2)) 1028 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 1029 } 1030 eoff += rthlen; 1031 nxt = rth->ip6r_nxt; 1032 break; 1033 case IPPROTO_FRAGMENT: 1034 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1035 eoff, sizeof(*fh)); 1036 if (fh == NULL) { 1037 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1038 return (-1); 1039 } 1040 /* 1041 * Data after a fragment header is meaningless 1042 * unless it is the first fragment, but 1043 * we'll go to the notify label for path MTU 1044 * discovery. 1045 */ 1046 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1047 goto notify; 1048 1049 eoff += sizeof(struct ip6_frag); 1050 nxt = fh->ip6f_nxt; 1051 break; 1052 default: 1053 /* 1054 * This case includes ESP and the No Next 1055 * Header. In such cases going to the notify 1056 * label does not have any meaning 1057 * (i.e. ctlfunc will be NULL), but we go 1058 * anyway since we might have to update 1059 * path MTU information. 1060 */ 1061 goto notify; 1062 } 1063 } 1064 notify: 1065 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1066 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1067 if (icmp6 == NULL) { 1068 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1069 return (-1); 1070 } 1071 1072 /* 1073 * retrieve parameters from the inner IPv6 header, and convert 1074 * them into sockaddr structures. 1075 * XXX: there is no guarantee that the source or destination 1076 * addresses of the inner packet are in the same scope zone as 1077 * the addresses of the icmp packet. But there is no other 1078 * way to determine the zone. 1079 */ 1080 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1081 1082 rcvif = m_get_rcvif(m, &s); 1083 if (__predict_false(rcvif == NULL)) 1084 goto freeit; 1085 sockaddr_in6_init(&icmp6dst, 1086 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1087 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1088 m_put_rcvif(rcvif, &s); 1089 goto freeit; 1090 } 1091 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1092 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1093 m_put_rcvif(rcvif, &s); 1094 goto freeit; 1095 } 1096 m_put_rcvif(rcvif, &s); 1097 1098 icmp6src.sin6_flowinfo = 1099 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1100 1101 if (finaldst == NULL) 1102 finaldst = &eip6->ip6_dst; 1103 ip6cp.ip6c_m = m; 1104 ip6cp.ip6c_icmp6 = icmp6; 1105 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1106 ip6cp.ip6c_off = eoff; 1107 ip6cp.ip6c_finaldst = finaldst; 1108 ip6cp.ip6c_src = &icmp6src; 1109 ip6cp.ip6c_nxt = nxt; 1110 1111 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1112 notifymtu = ntohl(icmp6->icmp6_mtu); 1113 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1114 } 1115 1116 ctlfunc = (void (*)(int, struct sockaddr *, void *)) 1117 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1118 if (ctlfunc) { 1119 (void) (*ctlfunc)(code, sin6tosa(&icmp6dst), 1120 &ip6cp); 1121 } 1122 } 1123 return (0); 1124 1125 freeit: 1126 m_freem(m); 1127 return (-1); 1128 } 1129 1130 void 1131 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1132 { 1133 unsigned long rtcount; 1134 struct icmp6_mtudisc_callback *mc; 1135 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1136 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1137 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1138 u_int mtu = ntohl(icmp6->icmp6_mtu); 1139 struct rtentry *rt = NULL; 1140 struct sockaddr_in6 sin6; 1141 struct ifnet *rcvif; 1142 int s; 1143 1144 /* 1145 * The MTU should not be less than the minimal IPv6 MTU except for the 1146 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1147 * In that one case, the MTU might be less than 1280. 1148 */ 1149 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1150 /* is the mtu even sane? */ 1151 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1152 return; 1153 if (!validated) 1154 return; 1155 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1156 } 1157 1158 /* 1159 * allow non-validated cases if memory is plenty, to make traffic 1160 * from non-connected pcb happy. 1161 */ 1162 mutex_enter(&icmp6_mtx); 1163 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1164 if (validated) { 1165 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) { 1166 mutex_exit(&icmp6_mtx); 1167 return; 1168 } 1169 else if (0 <= icmp6_mtudisc_lowat && 1170 rtcount > icmp6_mtudisc_lowat) { 1171 /* 1172 * XXX nuke a victim, install the new one. 1173 */ 1174 } 1175 } else { 1176 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) { 1177 mutex_exit(&icmp6_mtx); 1178 return; 1179 } 1180 } 1181 mutex_exit(&icmp6_mtx); 1182 1183 memset(&sin6, 0, sizeof(sin6)); 1184 sin6.sin6_family = PF_INET6; 1185 sin6.sin6_len = sizeof(struct sockaddr_in6); 1186 sin6.sin6_addr = *dst; 1187 rcvif = m_get_rcvif(m, &s); 1188 if (__predict_false(rcvif == NULL)) 1189 return; 1190 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1191 m_put_rcvif(rcvif, &s); 1192 return; 1193 } 1194 m_put_rcvif(rcvif, &s); 1195 1196 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1197 1198 if (rt && (rt->rt_flags & RTF_HOST) && 1199 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1200 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1201 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1202 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1203 rt->rt_rmx.rmx_mtu = mtu; 1204 } 1205 } 1206 if (rt) { 1207 rt_unref(rt); 1208 } 1209 1210 /* 1211 * Notify protocols that the MTU for this destination 1212 * has changed. 1213 */ 1214 mutex_enter(&icmp6_mtx); 1215 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1216 mc = LIST_NEXT(mc, mc_list)) 1217 (*mc->mc_func)(&sin6.sin6_addr); 1218 mutex_exit(&icmp6_mtx); 1219 } 1220 1221 /* 1222 * Process a Node Information Query packet, based on 1223 * draft-ietf-ipngwg-icmp-name-lookups-07. 1224 * 1225 * Spec incompatibilities: 1226 * - IPv6 Subject address handling 1227 * - IPv4 Subject address handling support missing 1228 * - Proxy reply (answer even if it's not for me) 1229 * - joins NI group address at in6_ifattach() time only, does not cope 1230 * with hostname changes by sethostname(3) 1231 */ 1232 static struct mbuf * 1233 ni6_input(struct mbuf *m, int off) 1234 { 1235 struct icmp6_nodeinfo *ni6, *nni6; 1236 struct mbuf *n = NULL; 1237 u_int16_t qtype; 1238 int subjlen; 1239 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1240 struct ni_reply_fqdn *fqdn; 1241 int addrs; /* for NI_QTYPE_NODEADDR */ 1242 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1243 struct sockaddr_in6 sin6; /* ip6_dst */ 1244 struct in6_addr in6_subj; /* subject address */ 1245 struct ip6_hdr *ip6; 1246 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1247 char *subj = NULL; 1248 struct ifnet *rcvif; 1249 int s, ss; 1250 struct ifaddr *ifa; 1251 struct psref psref; 1252 1253 ip6 = mtod(m, struct ip6_hdr *); 1254 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1255 if (ni6 == NULL) { 1256 /* m is already reclaimed */ 1257 return NULL; 1258 } 1259 1260 /* 1261 * Validate IPv6 destination address. 1262 * 1263 * The Responder must discard the Query without further processing 1264 * unless it is one of the Responder's unicast or anycast addresses, or 1265 * a link-local scope multicast address which the Responder has joined. 1266 * [icmp-name-lookups-07, Section 4.] 1267 */ 1268 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1269 /* XXX scopeid */ 1270 ss = pserialize_read_enter(); 1271 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1272 if (ifa != NULL) 1273 ; /* unicast/anycast, fine */ 1274 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1275 ; /* link-local multicast, fine */ 1276 else { 1277 pserialize_read_exit(ss); 1278 goto bad; 1279 } 1280 pserialize_read_exit(ss); 1281 1282 /* validate query Subject field. */ 1283 qtype = ntohs(ni6->ni_qtype); 1284 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1285 switch (qtype) { 1286 case NI_QTYPE_NOOP: 1287 case NI_QTYPE_SUPTYPES: 1288 /* 07 draft */ 1289 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1290 break; 1291 /* FALLTHROUGH */ 1292 case NI_QTYPE_FQDN: 1293 case NI_QTYPE_NODEADDR: 1294 case NI_QTYPE_IPV4ADDR: 1295 switch (ni6->ni_code) { 1296 case ICMP6_NI_SUBJ_IPV6: 1297 #if ICMP6_NI_SUBJ_IPV6 != 0 1298 case 0: 1299 #endif 1300 /* 1301 * backward compatibility - try to accept 03 draft 1302 * format, where no Subject is present. 1303 */ 1304 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1305 subjlen == 0) { 1306 oldfqdn++; 1307 break; 1308 } 1309 #if ICMP6_NI_SUBJ_IPV6 != 0 1310 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1311 goto bad; 1312 #endif 1313 1314 if (subjlen != sizeof(sin6.sin6_addr)) 1315 goto bad; 1316 1317 /* 1318 * Validate Subject address. 1319 * 1320 * Not sure what exactly "address belongs to the node" 1321 * means in the spec, is it just unicast, or what? 1322 * 1323 * At this moment we consider Subject address as 1324 * "belong to the node" if the Subject address equals 1325 * to the IPv6 destination address; validation for 1326 * IPv6 destination address should have done enough 1327 * check for us. 1328 * 1329 * We do not do proxy at this moment. 1330 */ 1331 /* m_pulldown instead of copy? */ 1332 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1333 subjlen, (void *)&in6_subj); 1334 rcvif = m_get_rcvif(m, &s); 1335 if (__predict_false(rcvif == NULL)) 1336 goto bad; 1337 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1338 m_put_rcvif(rcvif, &s); 1339 goto bad; 1340 } 1341 m_put_rcvif(rcvif, &s); 1342 1343 subj = (char *)&in6_subj; 1344 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1345 break; 1346 1347 /* 1348 * XXX if we are to allow other cases, we should really 1349 * be careful about scope here. 1350 * basically, we should disallow queries toward IPv6 1351 * destination X with subject Y, if scope(X) > scope(Y). 1352 * if we allow scope(X) > scope(Y), it will result in 1353 * information leakage across scope boundary. 1354 */ 1355 goto bad; 1356 1357 case ICMP6_NI_SUBJ_FQDN: 1358 /* 1359 * Validate Subject name with gethostname(3). 1360 * 1361 * The behavior may need some debate, since: 1362 * - we are not sure if the node has FQDN as 1363 * hostname (returned by gethostname(3)). 1364 * - the code does wildcard match for truncated names. 1365 * however, we are not sure if we want to perform 1366 * wildcard match, if gethostname(3) side has 1367 * truncated hostname. 1368 */ 1369 n = ni6_nametodns(hostname, hostnamelen, 0); 1370 if (!n || n->m_next || n->m_len == 0) 1371 goto bad; 1372 IP6_EXTHDR_GET(subj, char *, m, 1373 off + sizeof(struct icmp6_nodeinfo), subjlen); 1374 if (subj == NULL) 1375 goto bad; 1376 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1377 n->m_len)) { 1378 goto bad; 1379 } 1380 m_freem(n); 1381 n = NULL; 1382 break; 1383 1384 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1385 default: 1386 goto bad; 1387 } 1388 break; 1389 } 1390 1391 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1392 switch (qtype) { 1393 case NI_QTYPE_FQDN: 1394 if ((icmp6_nodeinfo & 1) == 0) 1395 goto bad; 1396 break; 1397 case NI_QTYPE_NODEADDR: 1398 case NI_QTYPE_IPV4ADDR: 1399 if ((icmp6_nodeinfo & 2) == 0) 1400 goto bad; 1401 break; 1402 } 1403 1404 /* guess reply length */ 1405 switch (qtype) { 1406 case NI_QTYPE_NOOP: 1407 break; /* no reply data */ 1408 case NI_QTYPE_SUPTYPES: 1409 replylen += sizeof(u_int32_t); 1410 break; 1411 case NI_QTYPE_FQDN: 1412 /* XXX will append an mbuf */ 1413 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1414 break; 1415 case NI_QTYPE_NODEADDR: 1416 addrs = ni6_addrs(ni6, m, &ifp, subj, &psref); 1417 if ((replylen += addrs * (sizeof(struct in6_addr) + 1418 sizeof(u_int32_t))) > MCLBYTES) 1419 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1420 break; 1421 case NI_QTYPE_IPV4ADDR: 1422 /* unsupported - should respond with unknown Qtype? */ 1423 goto bad; 1424 default: 1425 /* 1426 * XXX: We must return a reply with the ICMP6 code 1427 * `unknown Qtype' in this case. However we regard the case 1428 * as an FQDN query for backward compatibility. 1429 * Older versions set a random value to this field, 1430 * so it rarely varies in the defined qtypes. 1431 * But the mechanism is not reliable... 1432 * maybe we should obsolete older versions. 1433 */ 1434 qtype = NI_QTYPE_FQDN; 1435 /* XXX will append an mbuf */ 1436 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1437 oldfqdn++; 1438 break; 1439 } 1440 1441 /* allocate an mbuf to reply. */ 1442 MGETHDR(n, M_DONTWAIT, m->m_type); 1443 if (n == NULL) { 1444 if_put(ifp, &psref); 1445 m_freem(m); 1446 return (NULL); 1447 } 1448 M_MOVE_PKTHDR(n, m); /* just for rcvif */ 1449 if (replylen > MHLEN) { 1450 if (replylen > MCLBYTES) { 1451 /* 1452 * XXX: should we try to allocate more? But MCLBYTES 1453 * is probably much larger than IPV6_MMTU... 1454 */ 1455 goto bad; 1456 } 1457 MCLGET(n, M_DONTWAIT); 1458 if ((n->m_flags & M_EXT) == 0) { 1459 goto bad; 1460 } 1461 } 1462 n->m_pkthdr.len = n->m_len = replylen; 1463 1464 /* copy mbuf header and IPv6 + Node Information base headers */ 1465 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1466 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1467 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1468 1469 /* qtype dependent procedure */ 1470 switch (qtype) { 1471 case NI_QTYPE_NOOP: 1472 nni6->ni_code = ICMP6_NI_SUCCESS; 1473 nni6->ni_flags = 0; 1474 break; 1475 case NI_QTYPE_SUPTYPES: 1476 { 1477 u_int32_t v; 1478 nni6->ni_code = ICMP6_NI_SUCCESS; 1479 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1480 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1481 v = (u_int32_t)htonl(0x0000000f); 1482 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1483 break; 1484 } 1485 case NI_QTYPE_FQDN: 1486 nni6->ni_code = ICMP6_NI_SUCCESS; 1487 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1488 sizeof(struct ip6_hdr) + 1489 sizeof(struct icmp6_nodeinfo)); 1490 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1491 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1492 /* 1493 * XXX do we really have FQDN in variable "hostname"? 1494 */ 1495 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1496 if (n->m_next == NULL) 1497 goto bad; 1498 /* XXX we assume that n->m_next is not a chain */ 1499 if (n->m_next->m_next != NULL) 1500 goto bad; 1501 n->m_pkthdr.len += n->m_next->m_len; 1502 break; 1503 case NI_QTYPE_NODEADDR: 1504 { 1505 int lenlim, copied; 1506 1507 nni6->ni_code = ICMP6_NI_SUCCESS; 1508 n->m_pkthdr.len = n->m_len = 1509 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1510 lenlim = M_TRAILINGSPACE(n); 1511 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1512 if_put(ifp, &psref); 1513 ifp = NULL; 1514 /* XXX: reset mbuf length */ 1515 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1516 sizeof(struct icmp6_nodeinfo) + copied; 1517 break; 1518 } 1519 default: 1520 break; /* XXX impossible! */ 1521 } 1522 1523 nni6->ni_type = ICMP6_NI_REPLY; 1524 m_freem(m); 1525 return (n); 1526 1527 bad: 1528 if_put(ifp, &psref); 1529 m_freem(m); 1530 if (n) 1531 m_freem(n); 1532 return (NULL); 1533 } 1534 #undef hostnamelen 1535 1536 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1537 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1538 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1539 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1540 1541 /* 1542 * make a mbuf with DNS-encoded string. no compression support. 1543 * 1544 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1545 * treated as truncated name (two \0 at the end). this is a wild guess. 1546 * 1547 * old - return pascal string if non-zero 1548 */ 1549 static struct mbuf * 1550 ni6_nametodns(const char *name, int namelen, int old) 1551 { 1552 struct mbuf *m; 1553 char *cp, *ep; 1554 const char *p, *q; 1555 int i, len, nterm; 1556 1557 if (old) 1558 len = namelen + 1; 1559 else 1560 len = MCLBYTES; 1561 1562 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1563 MGET(m, M_DONTWAIT, MT_DATA); 1564 if (m && len > MLEN) { 1565 MCLGET(m, M_DONTWAIT); 1566 if ((m->m_flags & M_EXT) == 0) 1567 goto fail; 1568 } 1569 if (!m) 1570 goto fail; 1571 m->m_next = NULL; 1572 1573 if (old) { 1574 m->m_len = len; 1575 *mtod(m, char *) = namelen; 1576 bcopy(name, mtod(m, char *) + 1, namelen); 1577 return m; 1578 } else { 1579 m->m_len = 0; 1580 cp = mtod(m, char *); 1581 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1582 1583 /* if not certain about my name, return empty buffer */ 1584 if (namelen == 0) 1585 return m; 1586 1587 /* 1588 * guess if it looks like shortened hostname, or FQDN. 1589 * shortened hostname needs two trailing "\0". 1590 */ 1591 i = 0; 1592 for (p = name; p < name + namelen; p++) { 1593 if (*p == '.') 1594 i++; 1595 } 1596 if (i < 2) 1597 nterm = 2; 1598 else 1599 nterm = 1; 1600 1601 p = name; 1602 while (cp < ep && p < name + namelen) { 1603 i = 0; 1604 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1605 i++; 1606 /* result does not fit into mbuf */ 1607 if (cp + i + 1 >= ep) 1608 goto fail; 1609 /* 1610 * DNS label length restriction, RFC1035 page 8. 1611 * "i == 0" case is included here to avoid returning 1612 * 0-length label on "foo..bar". 1613 */ 1614 if (i <= 0 || i >= 64) 1615 goto fail; 1616 *cp++ = i; 1617 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1618 goto fail; 1619 while (i > 0) { 1620 if (!isalnum(*p) && *p != '-') 1621 goto fail; 1622 if (isupper(*p)) { 1623 *cp++ = tolower(*p); 1624 p++; 1625 } else 1626 *cp++ = *p++; 1627 i--; 1628 } 1629 p = q; 1630 if (p < name + namelen && *p == '.') 1631 p++; 1632 } 1633 /* termination */ 1634 if (cp + nterm >= ep) 1635 goto fail; 1636 while (nterm-- > 0) 1637 *cp++ = '\0'; 1638 m->m_len = cp - mtod(m, char *); 1639 return m; 1640 } 1641 1642 panic("should not reach here"); 1643 /* NOTREACHED */ 1644 1645 fail: 1646 if (m) 1647 m_freem(m); 1648 return NULL; 1649 } 1650 1651 /* 1652 * check if two DNS-encoded string matches. takes care of truncated 1653 * form (with \0\0 at the end). no compression support. 1654 * XXX upper/lowercase match (see RFC2065) 1655 */ 1656 static int 1657 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1658 { 1659 const char *a0, *b0; 1660 int l; 1661 1662 /* simplest case - need validation? */ 1663 if (alen == blen && memcmp(a, b, alen) == 0) 1664 return 1; 1665 1666 a0 = a; 1667 b0 = b; 1668 1669 /* termination is mandatory */ 1670 if (alen < 2 || blen < 2) 1671 return 0; 1672 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1673 return 0; 1674 alen--; 1675 blen--; 1676 1677 while (a - a0 < alen && b - b0 < blen) { 1678 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1679 return 0; 1680 1681 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1682 return 0; 1683 /* we don't support compression yet */ 1684 if (a[0] >= 64 || b[0] >= 64) 1685 return 0; 1686 1687 /* truncated case */ 1688 if (a[0] == 0 && a - a0 == alen - 1) 1689 return 1; 1690 if (b[0] == 0 && b - b0 == blen - 1) 1691 return 1; 1692 if (a[0] == 0 || b[0] == 0) 1693 return 0; 1694 1695 if (a[0] != b[0]) 1696 return 0; 1697 l = a[0]; 1698 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1699 return 0; 1700 if (memcmp(a + 1, b + 1, l) != 0) 1701 return 0; 1702 1703 a += 1 + l; 1704 b += 1 + l; 1705 } 1706 1707 if (a - a0 == alen && b - b0 == blen) 1708 return 1; 1709 else 1710 return 0; 1711 } 1712 1713 /* 1714 * calculate the number of addresses to be returned in the node info reply. 1715 */ 1716 static int 1717 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, 1718 struct ifnet **ifpp, char *subj, struct psref *psref) 1719 { 1720 struct ifnet *ifp; 1721 struct in6_ifaddr *ia6; 1722 struct ifaddr *ifa; 1723 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1724 int addrs = 0, addrsofif, iffound = 0; 1725 int niflags = ni6->ni_flags; 1726 int s; 1727 1728 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1729 switch (ni6->ni_code) { 1730 case ICMP6_NI_SUBJ_IPV6: 1731 if (subj == NULL) /* must be impossible... */ 1732 return (0); 1733 subj_ip6 = (struct sockaddr_in6 *)subj; 1734 break; 1735 default: 1736 /* 1737 * XXX: we only support IPv6 subject address for 1738 * this Qtype. 1739 */ 1740 return (0); 1741 } 1742 } 1743 1744 s = pserialize_read_enter(); 1745 IFNET_READER_FOREACH(ifp) { 1746 addrsofif = 0; 1747 IFADDR_READER_FOREACH(ifa, ifp) { 1748 if (ifa->ifa_addr->sa_family != AF_INET6) 1749 continue; 1750 ia6 = (struct in6_ifaddr *)ifa; 1751 1752 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1753 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1754 &ia6->ia_addr.sin6_addr)) 1755 iffound = 1; 1756 1757 /* 1758 * IPv4-mapped addresses can only be returned by a 1759 * Node Information proxy, since they represent 1760 * addresses of IPv4-only nodes, which perforce do 1761 * not implement this protocol. 1762 * [icmp-name-lookups-07, Section 5.4] 1763 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1764 * this function at this moment. 1765 */ 1766 1767 /* What do we have to do about ::1? */ 1768 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1769 case IPV6_ADDR_SCOPE_LINKLOCAL: 1770 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1771 continue; 1772 break; 1773 case IPV6_ADDR_SCOPE_SITELOCAL: 1774 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1775 continue; 1776 break; 1777 case IPV6_ADDR_SCOPE_GLOBAL: 1778 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1779 continue; 1780 break; 1781 default: 1782 continue; 1783 } 1784 1785 /* 1786 * check if anycast is okay. 1787 * XXX: just experimental. not in the spec. 1788 */ 1789 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1790 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1791 continue; /* we need only unicast addresses */ 1792 1793 addrsofif++; /* count the address */ 1794 } 1795 if (iffound) { 1796 if_acquire_NOMPSAFE(ifp, psref); 1797 pserialize_read_exit(s); 1798 *ifpp = ifp; 1799 return (addrsofif); 1800 } 1801 1802 addrs += addrsofif; 1803 } 1804 pserialize_read_exit(s); 1805 1806 return (addrs); 1807 } 1808 1809 static int 1810 ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1811 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1812 int resid) 1813 { 1814 struct ifnet *ifp; 1815 struct in6_ifaddr *ia6; 1816 struct ifaddr *ifa; 1817 struct ifnet *ifp_dep = NULL; 1818 int copied = 0, allow_deprecated = 0; 1819 u_char *cp = (u_char *)(nni6 + 1); 1820 int niflags = ni6->ni_flags; 1821 u_int32_t ltime; 1822 int s; 1823 1824 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1825 return (0); /* needless to copy */ 1826 1827 s = pserialize_read_enter(); 1828 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1829 again: 1830 1831 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1832 { 1833 IFADDR_READER_FOREACH(ifa, ifp) { 1834 if (ifa->ifa_addr->sa_family != AF_INET6) 1835 continue; 1836 ia6 = (struct in6_ifaddr *)ifa; 1837 1838 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1839 allow_deprecated == 0) { 1840 /* 1841 * prefererred address should be put before 1842 * deprecated addresses. 1843 */ 1844 1845 /* record the interface for later search */ 1846 if (ifp_dep == NULL) 1847 ifp_dep = ifp; 1848 1849 continue; 1850 } 1851 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1852 allow_deprecated != 0) 1853 continue; /* we now collect deprecated addrs */ 1854 1855 /* What do we have to do about ::1? */ 1856 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1857 case IPV6_ADDR_SCOPE_LINKLOCAL: 1858 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1859 continue; 1860 break; 1861 case IPV6_ADDR_SCOPE_SITELOCAL: 1862 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1863 continue; 1864 break; 1865 case IPV6_ADDR_SCOPE_GLOBAL: 1866 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1867 continue; 1868 break; 1869 default: 1870 continue; 1871 } 1872 1873 /* 1874 * check if anycast is okay. 1875 * XXX: just experimental. not in the spec. 1876 */ 1877 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1878 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1879 continue; 1880 1881 /* now we can copy the address */ 1882 if (resid < sizeof(struct in6_addr) + 1883 sizeof(u_int32_t)) { 1884 /* 1885 * We give up much more copy. 1886 * Set the truncate flag and return. 1887 */ 1888 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1889 goto out; 1890 } 1891 1892 /* 1893 * Set the TTL of the address. 1894 * The TTL value should be one of the following 1895 * according to the specification: 1896 * 1897 * 1. The remaining lifetime of a DHCP lease on the 1898 * address, or 1899 * 2. The remaining Valid Lifetime of a prefix from 1900 * which the address was derived through Stateless 1901 * Autoconfiguration. 1902 * 1903 * Note that we currently do not support stateful 1904 * address configuration by DHCPv6, so the former 1905 * case can't happen. 1906 * 1907 * TTL must be 2^31 > TTL >= 0. 1908 */ 1909 if (ia6->ia6_lifetime.ia6t_expire == 0) 1910 ltime = ND6_INFINITE_LIFETIME; 1911 else { 1912 if (ia6->ia6_lifetime.ia6t_expire > 1913 time_uptime) 1914 ltime = ia6->ia6_lifetime.ia6t_expire - 1915 time_uptime; 1916 else 1917 ltime = 0; 1918 } 1919 if (ltime > 0x7fffffff) 1920 ltime = 0x7fffffff; 1921 ltime = htonl(ltime); 1922 1923 bcopy(<ime, cp, sizeof(u_int32_t)); 1924 cp += sizeof(u_int32_t); 1925 1926 /* copy the address itself */ 1927 bcopy(&ia6->ia_addr.sin6_addr, cp, 1928 sizeof(struct in6_addr)); 1929 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1930 cp += sizeof(struct in6_addr); 1931 1932 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1933 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1934 } 1935 if (ifp0) /* we need search only on the specified IF */ 1936 break; 1937 } 1938 1939 if (allow_deprecated == 0 && ifp_dep != NULL) { 1940 ifp = ifp_dep; 1941 allow_deprecated = 1; 1942 1943 goto again; 1944 } 1945 out: 1946 pserialize_read_exit(s); 1947 return (copied); 1948 } 1949 1950 /* 1951 * XXX almost dup'ed code with rip6_input. 1952 */ 1953 static int 1954 icmp6_rip6_input(struct mbuf **mp, int off) 1955 { 1956 struct mbuf *m = *mp; 1957 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1958 struct inpcb_hdr *inph; 1959 struct in6pcb *in6p; 1960 struct in6pcb *last = NULL; 1961 struct sockaddr_in6 rip6src; 1962 struct icmp6_hdr *icmp6; 1963 struct mbuf *opts = NULL; 1964 1965 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1966 if (icmp6 == NULL) { 1967 /* m is already reclaimed */ 1968 return IPPROTO_DONE; 1969 } 1970 1971 /* 1972 * XXX: the address may have embedded scope zone ID, which should be 1973 * hidden from applications. 1974 */ 1975 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1976 if (sa6_recoverscope(&rip6src)) { 1977 m_freem(m); 1978 return (IPPROTO_DONE); 1979 } 1980 1981 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1982 in6p = (struct in6pcb *)inph; 1983 if (in6p->in6p_af != AF_INET6) 1984 continue; 1985 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1986 continue; 1987 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1988 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1989 continue; 1990 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1991 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1992 continue; 1993 if (in6p->in6p_icmp6filt 1994 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1995 in6p->in6p_icmp6filt)) 1996 continue; 1997 if (last) { 1998 struct mbuf *n; 1999 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 2000 if (last->in6p_flags & IN6P_CONTROLOPTS) 2001 ip6_savecontrol(last, &opts, ip6, n); 2002 /* strip intermediate headers */ 2003 m_adj(n, off); 2004 if (sbappendaddr(&last->in6p_socket->so_rcv, 2005 sin6tosa(&rip6src), n, opts) == 0) { 2006 /* should notify about lost packet */ 2007 m_freem(n); 2008 if (opts) 2009 m_freem(opts); 2010 } else 2011 sorwakeup(last->in6p_socket); 2012 opts = NULL; 2013 } 2014 } 2015 last = in6p; 2016 } 2017 if (last) { 2018 if (last->in6p_flags & IN6P_CONTROLOPTS) 2019 ip6_savecontrol(last, &opts, ip6, m); 2020 /* strip intermediate headers */ 2021 m_adj(m, off); 2022 if (sbappendaddr(&last->in6p_socket->so_rcv, 2023 sin6tosa(&rip6src), m, opts) == 0) { 2024 m_freem(m); 2025 if (opts) 2026 m_freem(opts); 2027 } else 2028 sorwakeup(last->in6p_socket); 2029 } else { 2030 m_freem(m); 2031 IP6_STATDEC(IP6_STAT_DELIVERED); 2032 } 2033 return IPPROTO_DONE; 2034 } 2035 2036 /* 2037 * Reflect the ip6 packet back to the source. 2038 * OFF points to the icmp6 header, counted from the top of the mbuf. 2039 * 2040 * Note: RFC 1885 required that an echo reply should be truncated if it 2041 * did not fit in with (return) path MTU, and KAME code supported the 2042 * behavior. However, as a clarification after the RFC, this limitation 2043 * was removed in a revised version of the spec, RFC 2463. We had kept the 2044 * old behavior, with a (non-default) ifdef block, while the new version of 2045 * the spec was an internet-draft status, and even after the new RFC was 2046 * published. But it would rather make sense to clean the obsoleted part 2047 * up, and to make the code simpler at this stage. 2048 */ 2049 void 2050 icmp6_reflect(struct mbuf *m, size_t off) 2051 { 2052 struct ip6_hdr *ip6; 2053 struct icmp6_hdr *icmp6; 2054 const struct in6_ifaddr *ia; 2055 const struct ip6aux *ip6a; 2056 int plen; 2057 int type, code; 2058 struct ifnet *outif = NULL; 2059 struct in6_addr origdst; 2060 struct ifnet *rcvif; 2061 int s; 2062 bool ip6_src_filled = false; 2063 2064 /* too short to reflect */ 2065 if (off < sizeof(struct ip6_hdr)) { 2066 nd6log(LOG_DEBUG, 2067 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2068 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2069 __FILE__, __LINE__); 2070 goto bad; 2071 } 2072 2073 /* 2074 * If there are extra headers between IPv6 and ICMPv6, strip 2075 * off that header first. 2076 */ 2077 #ifdef DIAGNOSTIC 2078 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2079 panic("assumption failed in icmp6_reflect"); 2080 #endif 2081 if (off > sizeof(struct ip6_hdr)) { 2082 size_t l; 2083 struct ip6_hdr nip6; 2084 2085 l = off - sizeof(struct ip6_hdr); 2086 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2087 m_adj(m, l); 2088 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2089 if (m->m_len < l) { 2090 if ((m = m_pullup(m, l)) == NULL) 2091 return; 2092 } 2093 bcopy((void *)&nip6, mtod(m, void *), sizeof(nip6)); 2094 } else /* off == sizeof(struct ip6_hdr) */ { 2095 size_t l; 2096 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2097 if (m->m_len < l) { 2098 if ((m = m_pullup(m, l)) == NULL) 2099 return; 2100 } 2101 } 2102 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2103 ip6 = mtod(m, struct ip6_hdr *); 2104 ip6->ip6_nxt = IPPROTO_ICMPV6; 2105 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2106 type = icmp6->icmp6_type; /* keep type for statistics */ 2107 code = icmp6->icmp6_code; /* ditto. */ 2108 2109 origdst = ip6->ip6_dst; 2110 /* 2111 * ip6_input() drops a packet if its src is multicast. 2112 * So, the src is never multicast. 2113 */ 2114 ip6->ip6_dst = ip6->ip6_src; 2115 2116 /* 2117 * If the incoming packet was addressed directly to us (i.e. unicast), 2118 * use dst as the src for the reply. 2119 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2120 * (for example) when we encounter an error while forwarding procedure 2121 * destined to a duplicated address of ours. 2122 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2123 * procedure of an outgoing packet of our own, in which case we need 2124 * to search in the ifaddr list. 2125 */ 2126 if (IN6_IS_ADDR_MULTICAST(&origdst)) 2127 ; 2128 else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2129 if ((ip6a->ip6a_flags & 2130 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2131 ip6->ip6_src = ip6a->ip6a_src; 2132 ip6_src_filled = true; 2133 } 2134 } else { 2135 union { 2136 struct sockaddr_in6 sin6; 2137 struct sockaddr sa; 2138 } u; 2139 int _s; 2140 struct ifaddr *ifa; 2141 2142 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2143 2144 _s = pserialize_read_enter(); 2145 ifa = ifa_ifwithaddr(&u.sa); 2146 2147 if (ifa != NULL) { 2148 ia = ifatoia6(ifa); 2149 if ((ia->ia6_flags & 2150 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2151 ip6->ip6_src = ia->ia_addr.sin6_addr; 2152 ip6_src_filled = true; 2153 } 2154 } 2155 pserialize_read_exit(_s); 2156 } 2157 2158 if (!ip6_src_filled) { 2159 int e; 2160 struct sockaddr_in6 sin6; 2161 struct route ro; 2162 2163 /* 2164 * This case matches to multicasts, our anycast, or unicasts 2165 * that we do not own. Select a source address based on the 2166 * source address of the erroneous packet. 2167 */ 2168 /* zone ID should be embedded */ 2169 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2170 2171 memset(&ro, 0, sizeof(ro)); 2172 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2173 &ip6->ip6_src); 2174 rtcache_free(&ro); 2175 if (e != 0) { 2176 char ip6buf[INET6_ADDRSTRLEN]; 2177 nd6log(LOG_DEBUG, 2178 "source can't be determined: " 2179 "dst=%s, error=%d\n", 2180 IN6_PRINT(ip6buf, &sin6.sin6_addr), e); 2181 goto bad; 2182 } 2183 } 2184 2185 ip6->ip6_flow = 0; 2186 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2187 ip6->ip6_vfc |= IPV6_VERSION; 2188 ip6->ip6_nxt = IPPROTO_ICMPV6; 2189 rcvif = m_get_rcvif(m, &s); 2190 if (rcvif) { 2191 /* XXX: This may not be the outgoing interface */ 2192 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2193 } else 2194 ip6->ip6_hlim = ip6_defhlim; 2195 m_put_rcvif(rcvif, &s); 2196 2197 m->m_pkthdr.csum_flags = 0; 2198 icmp6->icmp6_cksum = 0; 2199 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2200 sizeof(struct ip6_hdr), plen); 2201 2202 /* 2203 * XXX option handling 2204 */ 2205 2206 m->m_flags &= ~(M_BCAST|M_MCAST); 2207 2208 /* 2209 * To avoid a "too big" situation at an intermediate router 2210 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2211 * Note that only echo and node information replies are affected, 2212 * since the length of ICMP6 errors is limited to the minimum MTU. 2213 */ 2214 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) 2215 != 0 && outif) 2216 icmp6_ifstat_inc(outif, ifs6_out_error); 2217 if (outif) 2218 icmp6_ifoutstat_inc(outif, type, code); 2219 2220 return; 2221 2222 bad: 2223 m_freem(m); 2224 return; 2225 } 2226 2227 static const char * 2228 icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6, struct in6_addr *dst6, 2229 struct in6_addr *tgt6) 2230 { 2231 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 2232 char ip6buft[INET6_ADDRSTRLEN]; 2233 2234 snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)", 2235 IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6), 2236 IN6_PRINT(ip6buft, tgt6)); 2237 return buf; 2238 } 2239 2240 void 2241 icmp6_redirect_input(struct mbuf *m, int off) 2242 { 2243 struct ifnet *ifp; 2244 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2245 struct nd_redirect *nd_rd; 2246 int icmp6len = ntohs(ip6->ip6_plen); 2247 char *lladdr = NULL; 2248 int lladdrlen = 0; 2249 struct rtentry *rt = NULL; 2250 int is_router; 2251 int is_onlink; 2252 struct in6_addr src6 = ip6->ip6_src; 2253 struct in6_addr redtgt6; 2254 struct in6_addr reddst6; 2255 union nd_opts ndopts; 2256 struct psref psref; 2257 char ip6buf[INET6_ADDRSTRLEN]; 2258 char diagbuf[256]; 2259 2260 ifp = m_get_rcvif_psref(m, &psref); 2261 if (ifp == NULL) 2262 goto freeit; 2263 2264 /* XXX if we are router, we don't update route by icmp6 redirect */ 2265 if (ip6_forwarding) 2266 goto freeit; 2267 if (!icmp6_rediraccept) 2268 goto freeit; 2269 2270 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2271 if (nd_rd == NULL) { 2272 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2273 m_put_rcvif_psref(ifp, &psref); 2274 return; 2275 } 2276 redtgt6 = nd_rd->nd_rd_target; 2277 reddst6 = nd_rd->nd_rd_dst; 2278 2279 if (in6_setscope(&redtgt6, ifp, NULL) || 2280 in6_setscope(&reddst6, ifp, NULL)) { 2281 goto freeit; 2282 } 2283 2284 /* validation */ 2285 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2286 nd6log(LOG_ERR, 2287 "ICMP6 redirect sent from %s rejected; " 2288 "must be from linklocal\n", IN6_PRINT(ip6buf, &src6)); 2289 goto bad; 2290 } 2291 if (ip6->ip6_hlim != 255) { 2292 nd6log(LOG_ERR, 2293 "ICMP6 redirect sent from %s rejected; " 2294 "hlim=%d (must be 255)\n", 2295 IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim); 2296 goto bad; 2297 } 2298 { 2299 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2300 struct sockaddr_in6 sin6; 2301 struct in6_addr *gw6; 2302 2303 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2304 rt = rtalloc1(sin6tosa(&sin6), 0); 2305 if (rt) { 2306 if (rt->rt_gateway == NULL || 2307 rt->rt_gateway->sa_family != AF_INET6) { 2308 nd6log(LOG_ERR, 2309 "ICMP6 redirect rejected; no route " 2310 "with inet6 gateway found for redirect dst: %s\n", 2311 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2312 &src6, &reddst6, &redtgt6)); 2313 rt_unref(rt); 2314 goto bad; 2315 } 2316 2317 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2318 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2319 nd6log(LOG_ERR, 2320 "ICMP6 redirect rejected; " 2321 "not equal to gw-for-src=%s (must be same): %s\n", 2322 IN6_PRINT(ip6buf, gw6), 2323 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2324 &src6, &reddst6, &redtgt6)); 2325 rt_unref(rt); 2326 goto bad; 2327 } 2328 } else { 2329 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2330 "no route found for redirect dst: %s\n", 2331 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2332 &src6, &reddst6, &redtgt6)); 2333 goto bad; 2334 } 2335 rt_unref(rt); 2336 rt = NULL; 2337 } 2338 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2339 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2340 "redirect dst must be unicast: %s\n", 2341 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2342 &src6, &reddst6, &redtgt6)); 2343 goto bad; 2344 } 2345 2346 is_router = is_onlink = 0; 2347 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2348 is_router = 1; /* router case */ 2349 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2350 is_onlink = 1; /* on-link destination case */ 2351 if (!is_router && !is_onlink) { 2352 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2353 "neither router case nor onlink case: %s\n", 2354 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2355 &src6, &reddst6, &redtgt6)); 2356 goto bad; 2357 } 2358 /* validation passed */ 2359 2360 icmp6len -= sizeof(*nd_rd); 2361 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2362 if (nd6_options(&ndopts) < 0) { 2363 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2364 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2365 &src6, &reddst6, &redtgt6)); 2366 /* nd6_options have incremented stats */ 2367 goto freeit; 2368 } 2369 2370 if (ndopts.nd_opts_tgt_lladdr) { 2371 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2372 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2373 } 2374 2375 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2376 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2377 "(if %d, icmp6 packet %d): %s\n", 2378 IN6_PRINT(ip6buf, &redtgt6), 2379 ifp->if_addrlen, lladdrlen - 2, 2380 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2381 &src6, &reddst6, &redtgt6)); 2382 goto bad; 2383 } 2384 2385 /* RFC 2461 8.3 */ 2386 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2387 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2388 2389 m_put_rcvif_psref(ifp, &psref); 2390 ifp = NULL; 2391 2392 if (!is_onlink) { /* better router case. perform rtredirect. */ 2393 /* perform rtredirect */ 2394 struct sockaddr_in6 sdst; 2395 struct sockaddr_in6 sgw; 2396 struct sockaddr_in6 ssrc; 2397 unsigned long rtcount; 2398 struct rtentry *newrt = NULL; 2399 2400 /* 2401 * do not install redirect route, if the number of entries 2402 * is too much (> hiwat). note that, the node (= host) will 2403 * work just fine even if we do not install redirect route 2404 * (there will be additional hops, though). 2405 */ 2406 mutex_enter(&icmp6_mtx); 2407 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2408 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) { 2409 mutex_exit(&icmp6_mtx); 2410 goto freeit; 2411 } 2412 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) { 2413 mutex_exit(&icmp6_mtx); 2414 goto freeit; 2415 } else if (0 <= icmp6_redirect_lowat && 2416 rtcount > icmp6_redirect_lowat) { 2417 /* 2418 * XXX nuke a victim, install the new one. 2419 */ 2420 } 2421 2422 memset(&sdst, 0, sizeof(sdst)); 2423 memset(&sgw, 0, sizeof(sgw)); 2424 memset(&ssrc, 0, sizeof(ssrc)); 2425 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2426 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2427 sizeof(struct sockaddr_in6); 2428 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2429 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2430 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2431 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2432 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), 2433 &newrt); 2434 2435 if (newrt) { 2436 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2437 icmp6_redirect_timeout_q); 2438 rt_unref(newrt); 2439 } 2440 mutex_exit(&icmp6_mtx); 2441 } 2442 /* finally update cached route in each socket via pfctlinput */ 2443 { 2444 struct sockaddr_in6 sdst; 2445 2446 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2447 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2448 #if defined(IPSEC) 2449 if (ipsec_used) 2450 key_sa_routechange(sin6tosa(&sdst)); 2451 #endif 2452 } 2453 2454 freeit: 2455 if (ifp != NULL) 2456 m_put_rcvif_psref(ifp, &psref); 2457 m_freem(m); 2458 return; 2459 2460 bad: 2461 m_put_rcvif_psref(ifp, &psref); 2462 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2463 m_freem(m); 2464 } 2465 2466 void 2467 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2468 { 2469 struct ifnet *ifp; /* my outgoing interface */ 2470 struct in6_addr *ifp_ll6; 2471 struct in6_addr *nexthop; 2472 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2473 struct mbuf *m = NULL; /* newly allocated one */ 2474 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2475 struct nd_redirect *nd_rd; 2476 size_t maxlen; 2477 u_char *p; 2478 struct sockaddr_in6 src_sa; 2479 2480 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2481 2482 /* if we are not router, we don't send icmp6 redirect */ 2483 if (!ip6_forwarding) 2484 goto fail; 2485 2486 /* sanity check */ 2487 KASSERT(m0 != NULL); 2488 KASSERT(rt != NULL); 2489 2490 ifp = rt->rt_ifp; 2491 2492 /* 2493 * Address check: 2494 * the source address must identify a neighbor, and 2495 * the destination address must not be a multicast address 2496 * [RFC 2461, sec 8.2] 2497 */ 2498 sip6 = mtod(m0, struct ip6_hdr *); 2499 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2500 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2501 goto fail; 2502 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2503 goto fail; /* what should we do here? */ 2504 2505 /* rate limit */ 2506 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2507 goto fail; 2508 2509 /* 2510 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2511 * we almost always ask for an mbuf cluster for simplicity. 2512 * (MHLEN < IPV6_MMTU is almost always true) 2513 */ 2514 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2515 if (m && IPV6_MMTU >= MHLEN) { 2516 #if IPV6_MMTU >= MCLBYTES 2517 _MCLGET(m, mcl_cache, IPV6_MMTU, M_DONTWAIT); 2518 #else 2519 MCLGET(m, M_DONTWAIT); 2520 #endif 2521 } 2522 2523 if (!m) 2524 goto fail; 2525 m_reset_rcvif(m); 2526 m->m_len = 0; 2527 maxlen = M_TRAILINGSPACE(m); 2528 maxlen = min(IPV6_MMTU, maxlen); 2529 /* just for safety */ 2530 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2531 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2532 goto fail; 2533 } 2534 2535 { 2536 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2537 struct in6_ifaddr *ia; 2538 int s = pserialize_read_enter(); 2539 if ((ia = in6ifa_ifpforlinklocal(ifp, 2540 IN6_IFF_NOTREADY| 2541 IN6_IFF_ANYCAST)) == NULL) { 2542 pserialize_read_exit(s); 2543 goto fail; 2544 } 2545 ifp_ll6 = &ia->ia_addr.sin6_addr; 2546 pserialize_read_exit(s); 2547 } 2548 2549 /* get ip6 linklocal address for the router. */ 2550 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2551 struct sockaddr_in6 *sin6; 2552 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2553 nexthop = &sin6->sin6_addr; 2554 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2555 nexthop = NULL; 2556 } else 2557 nexthop = NULL; 2558 2559 /* ip6 */ 2560 ip6 = mtod(m, struct ip6_hdr *); 2561 ip6->ip6_flow = 0; 2562 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2563 ip6->ip6_vfc |= IPV6_VERSION; 2564 /* ip6->ip6_plen will be set later */ 2565 ip6->ip6_nxt = IPPROTO_ICMPV6; 2566 ip6->ip6_hlim = 255; 2567 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2568 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2569 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2570 2571 /* ND Redirect */ 2572 nd_rd = (struct nd_redirect *)(ip6 + 1); 2573 nd_rd->nd_rd_type = ND_REDIRECT; 2574 nd_rd->nd_rd_code = 0; 2575 nd_rd->nd_rd_reserved = 0; 2576 if (rt->rt_flags & RTF_GATEWAY) { 2577 /* 2578 * nd_rd->nd_rd_target must be a link-local address in 2579 * better router cases. 2580 */ 2581 if (!nexthop) 2582 goto fail; 2583 bcopy(nexthop, &nd_rd->nd_rd_target, 2584 sizeof(nd_rd->nd_rd_target)); 2585 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2586 sizeof(nd_rd->nd_rd_dst)); 2587 } else { 2588 /* make sure redtgt == reddst */ 2589 nexthop = &sip6->ip6_dst; 2590 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2591 sizeof(nd_rd->nd_rd_target)); 2592 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2593 sizeof(nd_rd->nd_rd_dst)); 2594 } 2595 2596 p = (u_char *)(nd_rd + 1); 2597 2598 { 2599 /* target lladdr option */ 2600 struct llentry *ln = NULL; 2601 int len; 2602 struct nd_opt_hdr *nd_opt; 2603 char *lladdr; 2604 2605 ln = nd6_lookup(nexthop, ifp, false); 2606 if (ln == NULL) 2607 goto nolladdropt; 2608 len = sizeof(*nd_opt) + ifp->if_addrlen; 2609 len = (len + 7) & ~7; /* round by 8 */ 2610 /* safety check */ 2611 if (len + (p - (u_char *)ip6) > maxlen) { 2612 LLE_RUNLOCK(ln); 2613 goto nolladdropt; 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 p += len; 2622 } 2623 LLE_RUNLOCK(ln); 2624 } 2625 nolladdropt:; 2626 2627 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2628 2629 /* just to be safe */ 2630 if (m0->m_flags & M_DECRYPTED) 2631 goto noredhdropt; 2632 if (p - (u_char *)ip6 > maxlen) 2633 goto noredhdropt; 2634 2635 { 2636 /* redirected header option */ 2637 int len; 2638 struct nd_opt_rd_hdr *nd_opt_rh; 2639 2640 /* 2641 * compute the maximum size for icmp6 redirect header option. 2642 * XXX room for auth header? 2643 */ 2644 len = maxlen - (p - (u_char *)ip6); 2645 len &= ~7; 2646 2647 /* 2648 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2649 * about padding/truncate rule for the original IP packet. 2650 * From the discussion on IPv6imp in Feb 1999, 2651 * the consensus was: 2652 * - "attach as much as possible" is the goal 2653 * - pad if not aligned (original size can be guessed by 2654 * original ip6 header) 2655 * Following code adds the padding if it is simple enough, 2656 * and truncates if not. 2657 */ 2658 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2659 /* not enough room, truncate */ 2660 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2661 m0->m_pkthdr.len); 2662 } else { 2663 /* 2664 * enough room, truncate if not aligned. 2665 * we don't pad here for simplicity. 2666 */ 2667 size_t extra; 2668 2669 extra = m0->m_pkthdr.len % 8; 2670 if (extra) { 2671 /* truncate */ 2672 m_adj(m0, -extra); 2673 } 2674 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2675 } 2676 2677 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2678 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2679 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2680 nd_opt_rh->nd_opt_rh_len = len >> 3; 2681 p += sizeof(*nd_opt_rh); 2682 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2683 2684 /* connect m0 to m */ 2685 m->m_pkthdr.len += m0->m_pkthdr.len; 2686 m_cat(m, m0); 2687 m0 = NULL; 2688 } 2689 noredhdropt: 2690 if (m0) { 2691 m_freem(m0); 2692 m0 = NULL; 2693 } 2694 2695 /* XXX: clear embedded link IDs in the inner header */ 2696 in6_clearscope(&sip6->ip6_src); 2697 in6_clearscope(&sip6->ip6_dst); 2698 in6_clearscope(&nd_rd->nd_rd_target); 2699 in6_clearscope(&nd_rd->nd_rd_dst); 2700 2701 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2702 2703 nd_rd->nd_rd_cksum = 0; 2704 nd_rd->nd_rd_cksum 2705 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2706 2707 /* send the packet to outside... */ 2708 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2709 icmp6_ifstat_inc(ifp, ifs6_out_error); 2710 2711 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2712 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2713 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2714 2715 return; 2716 2717 fail: 2718 if (m) 2719 m_freem(m); 2720 if (m0) 2721 m_freem(m0); 2722 } 2723 2724 /* 2725 * ICMPv6 socket option processing. 2726 */ 2727 int 2728 icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2729 { 2730 int error = 0; 2731 struct in6pcb *in6p = sotoin6pcb(so); 2732 2733 if (sopt->sopt_level != IPPROTO_ICMPV6) 2734 return rip6_ctloutput(op, so, sopt); 2735 2736 switch (op) { 2737 case PRCO_SETOPT: 2738 switch (sopt->sopt_name) { 2739 case ICMP6_FILTER: 2740 { 2741 struct icmp6_filter fil; 2742 2743 error = sockopt_get(sopt, &fil, sizeof(fil)); 2744 if (error) 2745 break; 2746 memcpy(in6p->in6p_icmp6filt, &fil, 2747 sizeof(struct icmp6_filter)); 2748 error = 0; 2749 break; 2750 } 2751 2752 default: 2753 error = ENOPROTOOPT; 2754 break; 2755 } 2756 break; 2757 2758 case PRCO_GETOPT: 2759 switch (sopt->sopt_name) { 2760 case ICMP6_FILTER: 2761 { 2762 if (in6p->in6p_icmp6filt == NULL) { 2763 error = EINVAL; 2764 break; 2765 } 2766 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2767 sizeof(struct icmp6_filter)); 2768 break; 2769 } 2770 2771 default: 2772 error = ENOPROTOOPT; 2773 break; 2774 } 2775 break; 2776 } 2777 2778 return (error); 2779 } 2780 2781 /* 2782 * Perform rate limit check. 2783 * Returns 0 if it is okay to send the icmp6 packet. 2784 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2785 * limitation. 2786 * 2787 * XXX per-destination/type check necessary? 2788 */ 2789 static int 2790 icmp6_ratelimit( 2791 const struct in6_addr *dst, /* not used at this moment */ 2792 const int type, /* not used at this moment */ 2793 const int code) /* not used at this moment */ 2794 { 2795 int ret; 2796 2797 ret = 0; /* okay to send */ 2798 2799 /* PPS limit */ 2800 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2801 icmp6errppslim)) { 2802 /* The packet is subject to rate limit */ 2803 ret++; 2804 } 2805 2806 return ret; 2807 } 2808 2809 static struct rtentry * 2810 icmp6_mtudisc_clone(struct sockaddr *dst) 2811 { 2812 struct rtentry *rt; 2813 int error; 2814 2815 rt = rtalloc1(dst, 1); 2816 if (rt == 0) 2817 return NULL; 2818 2819 /* If we didn't get a host route, allocate one */ 2820 if ((rt->rt_flags & RTF_HOST) == 0) { 2821 struct rtentry *nrt; 2822 2823 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2824 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2825 if (error) { 2826 rt_unref(rt); 2827 return NULL; 2828 } 2829 nrt->rt_rmx = rt->rt_rmx; 2830 rt_unref(rt); 2831 rt = nrt; 2832 } 2833 2834 mutex_enter(&icmp6_mtx); 2835 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2836 icmp6_mtudisc_timeout_q); 2837 mutex_exit(&icmp6_mtx); 2838 2839 if (error) { 2840 rt_unref(rt); 2841 return NULL; 2842 } 2843 2844 return rt; /* caller need to call rtfree() */ 2845 } 2846 2847 static void 2848 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2849 { 2850 2851 KASSERT(rt != NULL); 2852 rt_assert_referenced(rt); 2853 2854 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2855 (RTF_DYNAMIC | RTF_HOST)) { 2856 rtrequest(RTM_DELETE, rt_getkey(rt), 2857 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2858 } else { 2859 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2860 rt->rt_rmx.rmx_mtu = 0; 2861 } 2862 } 2863 2864 static void 2865 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2866 { 2867 2868 KASSERT(rt != NULL); 2869 rt_assert_referenced(rt); 2870 2871 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2872 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2873 rtrequest(RTM_DELETE, rt_getkey(rt), 2874 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2875 } 2876 } 2877 2878 /* 2879 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2880 */ 2881 static int 2882 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2883 { 2884 (void)&name; 2885 (void)&l; 2886 (void)&oname; 2887 2888 if (namelen != 0) 2889 return (EINVAL); 2890 2891 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2892 /*XXXUNCONST*/ 2893 __UNCONST(newp), newlen)); 2894 } 2895 2896 static int 2897 sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2898 { 2899 2900 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2901 } 2902 2903 static int 2904 sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2905 { 2906 int error, tmp; 2907 struct sysctlnode node; 2908 2909 mutex_enter(&icmp6_mtx); 2910 2911 node = *rnode; 2912 node.sysctl_data = &tmp; 2913 tmp = icmp6_redirtimeout; 2914 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2915 if (error || newp == NULL) 2916 goto out; 2917 if (tmp < 0) { 2918 error = EINVAL; 2919 goto out; 2920 } 2921 icmp6_redirtimeout = tmp; 2922 2923 if (icmp6_redirect_timeout_q != NULL) { 2924 if (icmp6_redirtimeout == 0) { 2925 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2926 } else { 2927 rt_timer_queue_change(icmp6_redirect_timeout_q, 2928 icmp6_redirtimeout); 2929 } 2930 } else if (icmp6_redirtimeout > 0) { 2931 icmp6_redirect_timeout_q = 2932 rt_timer_queue_create(icmp6_redirtimeout); 2933 } 2934 error = 0; 2935 out: 2936 mutex_exit(&icmp6_mtx); 2937 return error; 2938 } 2939 2940 static void 2941 sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2942 { 2943 extern int nd6_maxqueuelen; /* defined in nd6.c */ 2944 2945 sysctl_createv(clog, 0, NULL, NULL, 2946 CTLFLAG_PERMANENT, 2947 CTLTYPE_NODE, "inet6", NULL, 2948 NULL, 0, NULL, 0, 2949 CTL_NET, PF_INET6, CTL_EOL); 2950 sysctl_createv(clog, 0, NULL, NULL, 2951 CTLFLAG_PERMANENT, 2952 CTLTYPE_NODE, "icmp6", 2953 SYSCTL_DESCR("ICMPv6 related settings"), 2954 NULL, 0, NULL, 0, 2955 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2956 2957 sysctl_createv(clog, 0, NULL, NULL, 2958 CTLFLAG_PERMANENT, 2959 CTLTYPE_STRUCT, "stats", 2960 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2961 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2962 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2963 ICMPV6CTL_STATS, CTL_EOL); 2964 sysctl_createv(clog, 0, NULL, NULL, 2965 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2966 CTLTYPE_INT, "rediraccept", 2967 SYSCTL_DESCR("Accept and process redirect messages"), 2968 NULL, 0, &icmp6_rediraccept, 0, 2969 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2970 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2971 sysctl_createv(clog, 0, NULL, NULL, 2972 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2973 CTLTYPE_INT, "redirtimeout", 2974 SYSCTL_DESCR("Redirect generated route lifetime"), 2975 sysctl_net_inet6_icmp6_redirtimeout, 0, 2976 &icmp6_redirtimeout, 0, 2977 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2978 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2979 #if 0 /* obsoleted */ 2980 sysctl_createv(clog, 0, NULL, NULL, 2981 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2982 CTLTYPE_INT, "errratelimit", NULL, 2983 NULL, 0, &icmp6_errratelimit, 0, 2984 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2985 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2986 #endif 2987 sysctl_createv(clog, 0, NULL, NULL, 2988 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2989 CTLTYPE_INT, "nd6_prune", 2990 SYSCTL_DESCR("Neighbor discovery prune interval"), 2991 NULL, 0, &nd6_prune, 0, 2992 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2993 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2994 sysctl_createv(clog, 0, NULL, NULL, 2995 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2996 CTLTYPE_INT, "nd6_delay", 2997 SYSCTL_DESCR("First probe delay time"), 2998 NULL, 0, &nd6_delay, 0, 2999 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3000 ICMPV6CTL_ND6_DELAY, CTL_EOL); 3001 sysctl_createv(clog, 0, NULL, NULL, 3002 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3003 CTLTYPE_INT, "nd6_umaxtries", 3004 SYSCTL_DESCR("Number of unicast discovery attempts"), 3005 NULL, 0, &nd6_umaxtries, 0, 3006 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3007 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 3008 sysctl_createv(clog, 0, NULL, NULL, 3009 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3010 CTLTYPE_INT, "nd6_mmaxtries", 3011 SYSCTL_DESCR("Number of multicast discovery attempts"), 3012 NULL, 0, &nd6_mmaxtries, 0, 3013 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3014 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 3015 sysctl_createv(clog, 0, NULL, NULL, 3016 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3017 CTLTYPE_INT, "nd6_useloopback", 3018 SYSCTL_DESCR("Use loopback interface for local traffic"), 3019 NULL, 0, &nd6_useloopback, 0, 3020 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3021 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 3022 #if 0 /* obsoleted */ 3023 sysctl_createv(clog, 0, NULL, NULL, 3024 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3025 CTLTYPE_INT, "nd6_proxyall", NULL, 3026 NULL, 0, &nd6_proxyall, 0, 3027 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3028 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 3029 #endif 3030 sysctl_createv(clog, 0, NULL, NULL, 3031 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3032 CTLTYPE_INT, "nodeinfo", 3033 SYSCTL_DESCR("Respond to node information requests"), 3034 NULL, 0, &icmp6_nodeinfo, 0, 3035 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3036 ICMPV6CTL_NODEINFO, CTL_EOL); 3037 sysctl_createv(clog, 0, NULL, NULL, 3038 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3039 CTLTYPE_INT, "errppslimit", 3040 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 3041 NULL, 0, &icmp6errppslim, 0, 3042 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3043 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 3044 sysctl_createv(clog, 0, NULL, NULL, 3045 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3046 CTLTYPE_INT, "nd6_maxnudhint", 3047 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 3048 NULL, 0, &nd6_maxnudhint, 0, 3049 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3050 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 3051 sysctl_createv(clog, 0, NULL, NULL, 3052 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3053 CTLTYPE_INT, "mtudisc_hiwat", 3054 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3055 NULL, 0, &icmp6_mtudisc_hiwat, 0, 3056 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3057 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 3058 sysctl_createv(clog, 0, NULL, NULL, 3059 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3060 CTLTYPE_INT, "mtudisc_lowat", 3061 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3062 NULL, 0, &icmp6_mtudisc_lowat, 0, 3063 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3064 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 3065 sysctl_createv(clog, 0, NULL, NULL, 3066 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3067 CTLTYPE_INT, "nd6_debug", 3068 SYSCTL_DESCR("Enable neighbor discovery debug output"), 3069 NULL, 0, &nd6_debug, 0, 3070 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3071 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 3072 sysctl_createv(clog, 0, NULL, NULL, 3073 CTLFLAG_PERMANENT, 3074 CTLTYPE_STRUCT, "nd6_drlist", 3075 SYSCTL_DESCR("Default router list"), 3076 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3077 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3078 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 3079 sysctl_createv(clog, 0, NULL, NULL, 3080 CTLFLAG_PERMANENT, 3081 CTLTYPE_STRUCT, "nd6_prlist", 3082 SYSCTL_DESCR("Prefix list"), 3083 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3084 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3085 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 3086 sysctl_createv(clog, 0, NULL, NULL, 3087 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3088 CTLTYPE_INT, "maxqueuelen", 3089 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3090 NULL, 1, &nd6_maxqueuelen, 0, 3091 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3092 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3093 } 3094 3095 void 3096 icmp6_statinc(u_int stat) 3097 { 3098 3099 KASSERT(stat < ICMP6_NSTATS); 3100 ICMP6_STATINC(stat); 3101 } 3102