1 /* $NetBSD: icmp6.c,v 1.245 2020/06/12 11:04:45 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 1.245 2020/06/12 11:04:45 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 extern struct domain inet6domain; 118 119 percpu_t *icmp6stat_percpu; 120 121 extern struct inpcbtable raw6cbtable; 122 extern int icmp6errppslim; 123 static int icmp6errpps_count = 0; 124 static struct timeval icmp6errppslim_last; 125 extern int icmp6_nodeinfo; 126 127 /* 128 * List of callbacks to notify when Path MTU changes are made. 129 */ 130 struct icmp6_mtudisc_callback { 131 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 132 void (*mc_func)(struct in6_addr *); 133 }; 134 135 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 136 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 137 138 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 139 extern int pmtu_expire; 140 141 /* XXX do these values make any sense? */ 142 static int icmp6_mtudisc_hiwat = 1280; 143 static int icmp6_mtudisc_lowat = 256; 144 145 /* 146 * keep track of # of redirect routes. 147 */ 148 static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 149 150 /* XXX experimental, turned off */ 151 static int icmp6_redirect_hiwat = -1; 152 static int icmp6_redirect_lowat = -1; 153 154 /* Protect mtudisc and redirect stuffs */ 155 static kmutex_t icmp6_mtx __cacheline_aligned; 156 157 static void icmp6_errcount(u_int, int, int); 158 static int icmp6_rip6_input(struct mbuf **, int); 159 static void icmp6_reflect(struct mbuf *, size_t); 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 void icmp6_redirect_input(struct mbuf *, int); 164 static struct mbuf *ni6_input(struct mbuf *, int); 165 static struct mbuf *ni6_nametodns(const char *, int, int); 166 static int ni6_dnsmatch(const char *, int, const char *, int); 167 static int ni6_addrs(struct icmp6_nodeinfo *, struct ifnet **, char *, 168 struct psref *); 169 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 170 struct ifnet *, int); 171 static int icmp6_notify_error(struct mbuf *, int, int, int); 172 static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 173 static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 174 static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 175 static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 176 177 /* workqueue-based pr_input */ 178 static struct wqinput *icmp6_wqinput; 179 static void _icmp6_input(struct mbuf *m, int off, int proto); 180 181 void 182 icmp6_init(void) 183 { 184 185 sysctl_net_inet6_icmp6_setup(NULL); 186 mld_init(); 187 188 mutex_init(&icmp6_mtx, MUTEX_DEFAULT, IPL_NONE); 189 mutex_enter(&icmp6_mtx); 190 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 191 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 192 mutex_exit(&icmp6_mtx); 193 194 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS); 195 196 icmp6_wqinput = wqinput_create("icmp6", _icmp6_input); 197 } 198 199 static void 200 icmp6_errcount(u_int base, int type, int code) 201 { 202 switch (type) { 203 case ICMP6_DST_UNREACH: 204 switch (code) { 205 case ICMP6_DST_UNREACH_NOROUTE: 206 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE); 207 return; 208 case ICMP6_DST_UNREACH_ADMIN: 209 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN); 210 return; 211 case ICMP6_DST_UNREACH_BEYONDSCOPE: 212 ICMP6_STATINC(base + 213 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE); 214 return; 215 case ICMP6_DST_UNREACH_ADDR: 216 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR); 217 return; 218 case ICMP6_DST_UNREACH_NOPORT: 219 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT); 220 return; 221 } 222 break; 223 case ICMP6_PACKET_TOO_BIG: 224 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG); 225 return; 226 case ICMP6_TIME_EXCEEDED: 227 switch (code) { 228 case ICMP6_TIME_EXCEED_TRANSIT: 229 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT); 230 return; 231 case ICMP6_TIME_EXCEED_REASSEMBLY: 232 ICMP6_STATINC(base + 233 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY); 234 return; 235 } 236 break; 237 case ICMP6_PARAM_PROB: 238 switch (code) { 239 case ICMP6_PARAMPROB_HEADER: 240 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER); 241 return; 242 case ICMP6_PARAMPROB_NEXTHEADER: 243 ICMP6_STATINC(base + 244 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER); 245 return; 246 case ICMP6_PARAMPROB_OPTION: 247 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION); 248 return; 249 } 250 break; 251 case ND_REDIRECT: 252 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT); 253 return; 254 } 255 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN); 256 } 257 258 /* 259 * Register a Path MTU Discovery callback. 260 */ 261 void 262 icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *)) 263 { 264 struct icmp6_mtudisc_callback *mc, *new; 265 266 new = kmem_alloc(sizeof(*mc), KM_SLEEP); 267 268 mutex_enter(&icmp6_mtx); 269 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 270 mc = LIST_NEXT(mc, mc_list)) { 271 if (mc->mc_func == func) { 272 mutex_exit(&icmp6_mtx); 273 kmem_free(new, sizeof(*mc)); 274 return; 275 } 276 } 277 278 new->mc_func = func; 279 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, new, mc_list); 280 mutex_exit(&icmp6_mtx); 281 } 282 283 /* 284 * A wrapper function for icmp6_error() necessary when the erroneous packet 285 * may not contain enough scope zone information. 286 */ 287 void 288 icmp6_error2(struct mbuf *m, int type, int code, int param, 289 struct ifnet *ifp, struct in6_addr *src) 290 { 291 struct ip6_hdr *ip6; 292 293 KASSERT(ifp != NULL); 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 goto out; 305 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 306 goto out; 307 308 *src = ip6->ip6_src; 309 icmp6_error(m, type, code, param); 310 return; 311 312 out: 313 m_freem(m); 314 } 315 316 /* 317 * Generate an error packet of type error in response to bad IP6 packet. 318 */ 319 void 320 icmp6_error(struct mbuf *m, int type, int code, int param) 321 { 322 struct ip6_hdr *oip6, *nip6; 323 struct icmp6_hdr *icmp6; 324 u_int preplen; 325 int off; 326 int nxt; 327 328 ICMP6_STATINC(ICMP6_STAT_ERROR); 329 330 /* count per-type-code statistics */ 331 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); 332 333 if (m->m_flags & M_DECRYPTED) { 334 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 335 goto freeit; 336 } 337 338 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && 339 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) 340 return; 341 oip6 = mtod(m, struct ip6_hdr *); 342 343 /* 344 * If the destination address of the erroneous packet is a multicast 345 * address, or the packet was sent using link-layer multicast, 346 * we should basically suppress sending an error (RFC 2463, Section 347 * 2.4). 348 * We have two exceptions (the item e.2 in that section): 349 * - the Packet Too Big message can be sent for path MTU discovery. 350 * - the Parameter Problem Message that can be allowed an icmp6 error 351 * in the option type field. This check has been done in 352 * ip6_unknown_opt(), so we can just check the type and code. 353 */ 354 if ((m->m_flags & (M_BCAST|M_MCAST) || 355 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 356 (type != ICMP6_PACKET_TOO_BIG && 357 (type != ICMP6_PARAM_PROB || 358 code != ICMP6_PARAMPROB_OPTION))) 359 goto freeit; 360 361 /* 362 * RFC 2463, 2.4 (e.5): source address check. 363 * XXX: the case of anycast source? 364 */ 365 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 366 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 367 goto freeit; 368 369 /* 370 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 371 * don't do it. 372 */ 373 nxt = -1; 374 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 375 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 376 struct icmp6_hdr *icp; 377 378 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 379 sizeof(*icp)); 380 if (icp == NULL) { 381 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 382 return; 383 } 384 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 385 icp->icmp6_type == ND_REDIRECT) { 386 /* 387 * ICMPv6 error 388 * Special case: for redirect (which is 389 * informational) we must not send icmp6 error. 390 */ 391 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 392 goto freeit; 393 } else { 394 /* ICMPv6 informational - send the error */ 395 } 396 } else { 397 /* non-ICMPv6 - send the error */ 398 } 399 400 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 401 402 /* Finally, do rate limitation check. */ 403 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 404 ICMP6_STATINC(ICMP6_STAT_TOOFREQ); 405 goto freeit; 406 } 407 408 /* 409 * OK, ICMP6 can be generated. 410 */ 411 412 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 413 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 414 415 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 416 M_PREPEND(m, preplen, M_DONTWAIT); 417 if (m && M_UNWRITABLE(m, preplen)) 418 m = m_pullup(m, preplen); 419 if (m == NULL) { 420 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__); 421 return; 422 } 423 424 nip6 = mtod(m, struct ip6_hdr *); 425 nip6->ip6_src = oip6->ip6_src; 426 nip6->ip6_dst = oip6->ip6_dst; 427 428 in6_clearscope(&oip6->ip6_src); 429 in6_clearscope(&oip6->ip6_dst); 430 431 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 432 icmp6->icmp6_type = type; 433 icmp6->icmp6_code = code; 434 icmp6->icmp6_pptr = htonl((u_int32_t)param); 435 436 /* 437 * icmp6_reflect() is designed to be in the input path. 438 * icmp6_error() can be called from both input and output path, 439 * and if we are in output path rcvif could contain bogus value. 440 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 441 * information in ip header (nip6). 442 */ 443 m_reset_rcvif(m); 444 445 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 446 447 /* header order: IPv6 - ICMPv6 */ 448 icmp6_reflect(m, sizeof(struct ip6_hdr)); 449 450 return; 451 452 freeit: 453 /* 454 * If we can't tell whether or not we can generate ICMP6, free it. 455 */ 456 m_freem(m); 457 } 458 459 /* 460 * Process a received ICMP6 message. 461 */ 462 static void 463 _icmp6_input(struct mbuf *m, int off, int proto) 464 { 465 struct mbuf *n; 466 struct ip6_hdr *ip6, *nip6; 467 struct icmp6_hdr *icmp6, *nicmp6; 468 int icmp6len = m->m_pkthdr.len - off; 469 int code, sum; 470 struct ifnet *rcvif; 471 struct psref psref; 472 char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN]; 473 474 rcvif = m_get_rcvif_psref(m, &psref); 475 if (__predict_false(rcvif == NULL)) 476 goto freeit; 477 478 #define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 479 KASSERT(ICMP6_MAXLEN < MCLBYTES); 480 icmp6_ifstat_inc(rcvif, ifs6_in_msg); 481 482 /* 483 * Locate icmp6 structure in mbuf, and check 484 * that not corrupted and of at least minimum length 485 */ 486 487 if (icmp6len < sizeof(struct icmp6_hdr)) { 488 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 489 icmp6_ifstat_inc(rcvif, ifs6_in_error); 490 goto freeit; 491 } 492 493 if (m->m_len < sizeof(struct ip6_hdr)) { 494 m = m_pullup(m, sizeof(struct ip6_hdr)); 495 if (m == NULL) { 496 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 497 icmp6_ifstat_inc(rcvif, ifs6_in_error); 498 goto freeit; 499 } 500 } 501 502 ip6 = mtod(m, struct ip6_hdr *); 503 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 504 if (icmp6 == NULL) { 505 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 506 icmp6_ifstat_inc(rcvif, ifs6_in_error); 507 goto freeit; 508 } 509 510 /* 511 * Enforce alignment requirements that are violated in 512 * some cases, see kern/50766 for details. 513 */ 514 if (IP6_HDR_ALIGNED_P(icmp6) == 0) { 515 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0); 516 if (m == NULL) { 517 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 518 icmp6_ifstat_inc(rcvif, ifs6_in_error); 519 goto freeit; 520 } 521 ip6 = mtod(m, struct ip6_hdr *); 522 icmp6 = (struct icmp6_hdr *)(mtod(m, char *) + off); 523 } 524 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 525 526 /* 527 * calculate the checksum 528 */ 529 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 530 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 531 icmp6->icmp6_type, sum, IN6_PRINT(ip6buf, &ip6->ip6_src)); 532 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 533 icmp6_ifstat_inc(rcvif, ifs6_in_error); 534 goto freeit; 535 } 536 537 #if defined(NFAITH) && 0 < NFAITH 538 if (faithprefix(&ip6->ip6_dst)) { 539 /* 540 * Deliver very specific ICMP6 type only. 541 * This is important to deliver TOOBIG. Otherwise PMTUD 542 * will not work. 543 */ 544 switch (icmp6->icmp6_type) { 545 case ICMP6_DST_UNREACH: 546 case ICMP6_PACKET_TOO_BIG: 547 case ICMP6_TIME_EXCEEDED: 548 break; 549 default: 550 goto freeit; 551 } 552 } 553 #endif 554 555 code = icmp6->icmp6_code; 556 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 557 558 switch (icmp6->icmp6_type) { 559 case ICMP6_DST_UNREACH: 560 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 561 switch (code) { 562 case ICMP6_DST_UNREACH_NOROUTE: 563 code = PRC_UNREACH_NET; 564 break; 565 case ICMP6_DST_UNREACH_ADMIN: 566 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 567 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 568 break; 569 case ICMP6_DST_UNREACH_ADDR: 570 code = PRC_HOSTDEAD; 571 break; 572 case ICMP6_DST_UNREACH_BEYONDSCOPE: 573 /* I mean "source address was incorrect." */ 574 code = PRC_UNREACH_NET; 575 break; 576 case ICMP6_DST_UNREACH_NOPORT: 577 code = PRC_UNREACH_PORT; 578 break; 579 default: 580 goto badcode; 581 } 582 goto deliver; 583 584 case ICMP6_PACKET_TOO_BIG: 585 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 586 587 /* 588 * MTU is checked in icmp6_mtudisc. 589 */ 590 code = PRC_MSGSIZE; 591 592 /* 593 * Updating the path MTU will be done after examining 594 * intermediate extension headers. 595 */ 596 goto deliver; 597 598 case ICMP6_TIME_EXCEEDED: 599 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 600 switch (code) { 601 case ICMP6_TIME_EXCEED_TRANSIT: 602 code = PRC_TIMXCEED_INTRANS; 603 break; 604 case ICMP6_TIME_EXCEED_REASSEMBLY: 605 code = PRC_TIMXCEED_REASS; 606 break; 607 default: 608 goto badcode; 609 } 610 goto deliver; 611 612 case ICMP6_PARAM_PROB: 613 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 614 switch (code) { 615 case ICMP6_PARAMPROB_NEXTHEADER: 616 code = PRC_UNREACH_PROTOCOL; 617 break; 618 case ICMP6_PARAMPROB_HEADER: 619 case ICMP6_PARAMPROB_OPTION: 620 code = PRC_PARAMPROB; 621 break; 622 default: 623 goto badcode; 624 } 625 goto deliver; 626 627 case ICMP6_ECHO_REQUEST: 628 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 629 if (code != 0) 630 goto badcode; 631 /* 632 * Copy mbuf to send to two data paths: userland socket(s), 633 * and to the querier (echo reply). 634 * m: a copy for socket, n: a copy for querier 635 * 636 * If the first mbuf is shared, or the first mbuf is too short, 637 * copy the first part of the data into a fresh mbuf. 638 * Otherwise, we will wrongly overwrite both copies. 639 */ 640 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 641 /* Give up local */ 642 n = m; 643 m = NULL; 644 } else if (M_UNWRITABLE(n, off + sizeof(struct icmp6_hdr))) { 645 struct mbuf *n0 = n; 646 647 /* 648 * Prepare an internal mbuf. m_pullup() doesn't 649 * always copy the length we specified. 650 */ 651 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 652 /* Give up local */ 653 n = m; 654 m = NULL; 655 } 656 m_freem(n0); 657 } 658 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 659 sizeof(*nicmp6)); 660 if (nicmp6 == NULL) 661 goto freeit; 662 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 663 nicmp6->icmp6_code = 0; 664 if (n) { 665 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 666 icmp6s[ICMP6_STAT_REFLECT]++; 667 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 668 ICMP6_STAT_PUTREF(); 669 icmp6_reflect(n, off); 670 } 671 if (!m) 672 goto freeit; 673 break; 674 675 case ICMP6_ECHO_REPLY: 676 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 677 if (code != 0) 678 goto badcode; 679 break; 680 681 case MLD_LISTENER_QUERY: 682 case MLD_LISTENER_REPORT: 683 if (icmp6len < sizeof(struct mld_hdr)) 684 goto badlen; 685 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 686 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 687 else 688 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 689 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 690 /* give up local */ 691 mld_input(m, off); 692 m = NULL; 693 goto freeit; 694 } 695 mld_input(n, off); 696 /* m stays. */ 697 break; 698 699 case MLD_LISTENER_DONE: 700 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 701 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 702 goto badlen; 703 break; /* nothing to be done in kernel */ 704 705 case MLD_MTRACE_RESP: 706 case MLD_MTRACE: 707 /* XXX: these two are experimental. not officially defined. */ 708 /* XXX: per-interface statistics? */ 709 break; /* just pass it to applications */ 710 711 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 712 { 713 enum { WRU, FQDN } mode; 714 715 if (!icmp6_nodeinfo) 716 break; 717 718 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 719 mode = WRU; 720 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 721 mode = FQDN; 722 else 723 goto badlen; 724 725 if (mode == FQDN) { 726 n = m_copypacket(m, M_DONTWAIT); 727 if (n) 728 n = ni6_input(n, off); 729 } else { 730 u_char *p; 731 int maxhlen; 732 733 if ((icmp6_nodeinfo & 5) != 5) 734 break; 735 736 if (code != 0) 737 goto badcode; 738 MGETHDR(n, M_DONTWAIT, m->m_type); 739 if (n && ICMP6_MAXLEN > MHLEN) { 740 MCLGET(n, M_DONTWAIT); 741 if ((n->m_flags & M_EXT) == 0) { 742 m_free(n); 743 n = NULL; 744 } 745 } 746 if (n == NULL) { 747 /* Give up remote */ 748 break; 749 } 750 m_reset_rcvif(n); 751 n->m_len = 0; 752 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 753 if (maxhlen < 0) { 754 m_free(n); 755 break; 756 } 757 if (maxhlen > hostnamelen) 758 maxhlen = hostnamelen; 759 /* 760 * Copy IPv6 and ICMPv6 only. 761 */ 762 nip6 = mtod(n, struct ip6_hdr *); 763 memcpy(nip6, ip6, sizeof(struct ip6_hdr)); 764 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 765 memcpy(nicmp6, icmp6, sizeof(struct icmp6_hdr)); 766 767 p = (u_char *)(nicmp6 + 1); 768 memset(p, 0, 4); 769 memcpy(p + 4, hostname, maxhlen); /* meaningless TTL */ 770 771 m_copy_pkthdr(n, m); 772 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 773 sizeof(struct icmp6_hdr) + 4 + maxhlen; 774 nicmp6->icmp6_type = ICMP6_WRUREPLY; 775 nicmp6->icmp6_code = 0; 776 } 777 if (n) { 778 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 779 icmp6s[ICMP6_STAT_REFLECT]++; 780 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 781 ICMP6_STAT_PUTREF(); 782 icmp6_reflect(n, sizeof(struct ip6_hdr)); 783 } 784 break; 785 } 786 787 case ICMP6_WRUREPLY: 788 if (code != 0) 789 goto badcode; 790 break; 791 792 case ND_ROUTER_SOLICIT: 793 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 794 /* FALLTHROUGH */ 795 case ND_ROUTER_ADVERT: 796 if (icmp6->icmp6_type == ND_ROUTER_ADVERT) 797 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 798 if (code != 0) 799 goto badcode; 800 if ((icmp6->icmp6_type == ND_ROUTER_SOLICIT && 801 icmp6len < sizeof(struct nd_router_solicit)) || 802 (icmp6->icmp6_type == ND_ROUTER_ADVERT && 803 icmp6len < sizeof(struct nd_router_advert))) 804 goto badlen; 805 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 806 /* give up local */ 807 nd6_rtr_cache(m, off, icmp6len, icmp6->icmp6_type); 808 m = NULL; 809 goto freeit; 810 } 811 nd6_rtr_cache(n, off, icmp6len, icmp6->icmp6_type); 812 /* m stays. */ 813 break; 814 815 case ND_NEIGHBOR_SOLICIT: 816 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 817 if (code != 0) 818 goto badcode; 819 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 820 goto badlen; 821 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 822 /* give up local */ 823 nd6_ns_input(m, off, icmp6len); 824 m = NULL; 825 goto freeit; 826 } 827 nd6_ns_input(n, off, icmp6len); 828 /* m stays. */ 829 break; 830 831 case ND_NEIGHBOR_ADVERT: 832 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 833 if (code != 0) 834 goto badcode; 835 if (icmp6len < sizeof(struct nd_neighbor_advert)) 836 goto badlen; 837 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 838 /* give up local */ 839 nd6_na_input(m, off, icmp6len); 840 m = NULL; 841 goto freeit; 842 } 843 nd6_na_input(n, off, icmp6len); 844 /* m stays. */ 845 break; 846 847 case ND_REDIRECT: 848 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 849 if (code != 0) 850 goto badcode; 851 if (icmp6len < sizeof(struct nd_redirect)) 852 goto badlen; 853 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 854 /* give up local */ 855 icmp6_redirect_input(m, off); 856 m = NULL; 857 goto freeit; 858 } 859 icmp6_redirect_input(n, off); 860 /* m stays. */ 861 break; 862 863 case ICMP6_ROUTER_RENUMBERING: 864 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 865 code != ICMP6_ROUTER_RENUMBERING_RESULT) 866 goto badcode; 867 if (icmp6len < sizeof(struct icmp6_router_renum)) 868 goto badlen; 869 break; 870 871 default: 872 nd6log(LOG_DEBUG, 873 "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 874 icmp6->icmp6_type, 875 IN6_PRINT(ip6buf, &ip6->ip6_src), 876 IN6_PRINT(ip6buf2, &ip6->ip6_dst), 877 rcvif ? rcvif->if_index : 0); 878 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 879 /* ICMPv6 error: MUST deliver it by spec... */ 880 code = PRC_NCMDS; 881 /* deliver */ 882 } else { 883 /* ICMPv6 informational: MUST not deliver */ 884 break; 885 } 886 deliver: 887 if (icmp6_notify_error(m, off, icmp6len, code)) { 888 /* In this case, m should've been freed. */ 889 m_put_rcvif_psref(rcvif, &psref); 890 return; 891 } 892 break; 893 894 badcode: 895 ICMP6_STATINC(ICMP6_STAT_BADCODE); 896 break; 897 898 badlen: 899 ICMP6_STATINC(ICMP6_STAT_BADLEN); 900 break; 901 } 902 m_put_rcvif_psref(rcvif, &psref); 903 904 /* deliver the packet to appropriate sockets */ 905 icmp6_rip6_input(&m, off); 906 907 return; 908 909 freeit: 910 m_put_rcvif_psref(rcvif, &psref); 911 m_freem(m); 912 return; 913 } 914 915 int 916 icmp6_input(struct mbuf **mp, int *offp, int proto) 917 { 918 919 wqinput_input(icmp6_wqinput, *mp, *offp, proto); 920 921 return IPPROTO_DONE; 922 } 923 924 static int 925 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 926 { 927 struct icmp6_hdr *icmp6; 928 struct ip6_hdr *eip6; 929 u_int32_t notifymtu; 930 struct sockaddr_in6 icmp6src, icmp6dst; 931 932 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 933 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 934 goto freeit; 935 } 936 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 937 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 938 if (icmp6 == NULL) { 939 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 940 return (-1); 941 } 942 eip6 = (struct ip6_hdr *)(icmp6 + 1); 943 944 /* Detect the upper level protocol */ 945 { 946 void *(*ctlfunc)(int, const struct sockaddr *, void *); 947 u_int8_t nxt = eip6->ip6_nxt; 948 int eoff = off + sizeof(struct icmp6_hdr) + 949 sizeof(struct ip6_hdr); 950 struct ip6ctlparam ip6cp; 951 struct in6_addr *finaldst = NULL; 952 int icmp6type = icmp6->icmp6_type; 953 struct ip6_frag *fh; 954 struct ip6_rthdr *rth; 955 struct ifnet *rcvif; 956 int s; 957 958 while (1) { /* XXX: should avoid infinite loop explicitly? */ 959 struct ip6_ext *eh; 960 961 switch (nxt) { 962 case IPPROTO_HOPOPTS: 963 case IPPROTO_DSTOPTS: 964 case IPPROTO_AH: 965 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 966 eoff, sizeof(*eh)); 967 if (eh == NULL) { 968 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 969 return (-1); 970 } 971 972 if (nxt == IPPROTO_AH) 973 eoff += (eh->ip6e_len + 2) << 2; 974 else 975 eoff += (eh->ip6e_len + 1) << 3; 976 nxt = eh->ip6e_nxt; 977 break; 978 case IPPROTO_ROUTING: 979 /* Ignore the option. */ 980 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 981 eoff, sizeof(*rth)); 982 if (rth == NULL) { 983 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 984 return (-1); 985 } 986 987 eoff += (rth->ip6r_len + 1) << 3; 988 nxt = rth->ip6r_nxt; 989 break; 990 case IPPROTO_FRAGMENT: 991 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 992 eoff, sizeof(*fh)); 993 if (fh == NULL) { 994 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 995 return (-1); 996 } 997 /* 998 * Data after a fragment header is meaningless 999 * unless it is the first fragment, but 1000 * we'll go to the notify label for path MTU 1001 * discovery. 1002 */ 1003 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1004 goto notify; 1005 1006 eoff += sizeof(struct ip6_frag); 1007 nxt = fh->ip6f_nxt; 1008 break; 1009 default: 1010 /* 1011 * This case includes ESP and the No Next 1012 * Header. In such cases going to the notify 1013 * label does not have any meaning 1014 * (i.e. ctlfunc will be NULL), but we go 1015 * anyway since we might have to update 1016 * path MTU information. 1017 */ 1018 goto notify; 1019 } 1020 } 1021 notify: 1022 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1023 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1024 if (icmp6 == NULL) { 1025 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1026 return (-1); 1027 } 1028 1029 /* 1030 * retrieve parameters from the inner IPv6 header, and convert 1031 * them into sockaddr structures. 1032 * XXX: there is no guarantee that the source or destination 1033 * addresses of the inner packet are in the same scope zone as 1034 * the addresses of the icmp packet. But there is no other 1035 * way to determine the zone. 1036 */ 1037 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1038 1039 rcvif = m_get_rcvif(m, &s); 1040 if (__predict_false(rcvif == NULL)) 1041 goto freeit; 1042 sockaddr_in6_init(&icmp6dst, 1043 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1044 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1045 m_put_rcvif(rcvif, &s); 1046 goto freeit; 1047 } 1048 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1049 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1050 m_put_rcvif(rcvif, &s); 1051 goto freeit; 1052 } 1053 m_put_rcvif(rcvif, &s); 1054 1055 icmp6src.sin6_flowinfo = 1056 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1057 1058 if (finaldst == NULL) 1059 finaldst = &eip6->ip6_dst; 1060 ip6cp.ip6c_m = m; 1061 ip6cp.ip6c_icmp6 = icmp6; 1062 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1063 ip6cp.ip6c_off = eoff; 1064 ip6cp.ip6c_finaldst = finaldst; 1065 ip6cp.ip6c_src = &icmp6src; 1066 ip6cp.ip6c_nxt = nxt; 1067 1068 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1069 notifymtu = ntohl(icmp6->icmp6_mtu); 1070 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1071 } 1072 1073 ctlfunc = inet6sw[ip6_protox[nxt]].pr_ctlinput; 1074 if (ctlfunc) { 1075 (void)(*ctlfunc)(code, sin6tosa(&icmp6dst), &ip6cp); 1076 } 1077 } 1078 return (0); 1079 1080 freeit: 1081 m_freem(m); 1082 return (-1); 1083 } 1084 1085 void 1086 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1087 { 1088 unsigned long rtcount; 1089 struct icmp6_mtudisc_callback *mc; 1090 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1091 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1092 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1093 u_int mtu = ntohl(icmp6->icmp6_mtu); 1094 struct rtentry *rt = NULL; 1095 struct sockaddr_in6 sin6; 1096 struct ifnet *rcvif; 1097 int s; 1098 1099 /* 1100 * The MTU should not be less than the minimal IPv6 MTU except for the 1101 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1102 * In that one case, the MTU might be less than 1280. 1103 */ 1104 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1105 /* is the mtu even sane? */ 1106 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1107 return; 1108 if (!validated) 1109 return; 1110 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1111 } 1112 1113 /* 1114 * allow non-validated cases if memory is plenty, to make traffic 1115 * from non-connected pcb happy. 1116 */ 1117 mutex_enter(&icmp6_mtx); 1118 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1119 if (validated) { 1120 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) { 1121 mutex_exit(&icmp6_mtx); 1122 return; 1123 } else if (0 <= icmp6_mtudisc_lowat && 1124 rtcount > icmp6_mtudisc_lowat) { 1125 /* 1126 * XXX nuke a victim, install the new one. 1127 */ 1128 } 1129 } else { 1130 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) { 1131 mutex_exit(&icmp6_mtx); 1132 return; 1133 } 1134 } 1135 mutex_exit(&icmp6_mtx); 1136 1137 memset(&sin6, 0, sizeof(sin6)); 1138 sin6.sin6_family = PF_INET6; 1139 sin6.sin6_len = sizeof(struct sockaddr_in6); 1140 sin6.sin6_addr = *dst; 1141 rcvif = m_get_rcvif(m, &s); 1142 if (__predict_false(rcvif == NULL)) 1143 return; 1144 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1145 m_put_rcvif(rcvif, &s); 1146 return; 1147 } 1148 m_put_rcvif(rcvif, &s); 1149 1150 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1151 1152 if (rt && (rt->rt_flags & RTF_HOST) && 1153 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1154 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1155 if (mtu < rt->rt_ifp->if_mtu) { 1156 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1157 rt->rt_rmx.rmx_mtu = mtu; 1158 } 1159 } 1160 if (rt) { 1161 rt_unref(rt); 1162 } 1163 1164 /* 1165 * Notify protocols that the MTU for this destination 1166 * has changed. 1167 */ 1168 mutex_enter(&icmp6_mtx); 1169 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1170 mc = LIST_NEXT(mc, mc_list)) 1171 (*mc->mc_func)(&sin6.sin6_addr); 1172 mutex_exit(&icmp6_mtx); 1173 } 1174 1175 /* 1176 * Process a Node Information Query packet, based on 1177 * draft-ietf-ipngwg-icmp-name-lookups-07. 1178 * 1179 * Spec incompatibilities: 1180 * - IPv6 Subject address handling 1181 * - IPv4 Subject address handling support missing 1182 * - Proxy reply (answer even if it's not for me) 1183 * - joins NI group address at in6_ifattach() time only, does not cope 1184 * with hostname changes by sethostname(3) 1185 */ 1186 static struct mbuf * 1187 ni6_input(struct mbuf *m, int off) 1188 { 1189 struct icmp6_nodeinfo *ni6, *nni6; 1190 struct mbuf *n = NULL; 1191 u_int16_t qtype; 1192 int subjlen; 1193 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1194 struct ni_reply_fqdn *fqdn; 1195 int addrs; /* for NI_QTYPE_NODEADDR */ 1196 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1197 struct sockaddr_in6 sin6; /* ip6_dst */ 1198 struct in6_addr in6_subj; /* subject address */ 1199 struct ip6_hdr *ip6; 1200 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1201 char *subj = NULL; 1202 struct ifnet *rcvif; 1203 int s, ss; 1204 struct ifaddr *ifa; 1205 struct psref psref; 1206 1207 ip6 = mtod(m, struct ip6_hdr *); 1208 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1209 if (ni6 == NULL) { 1210 /* m is already reclaimed */ 1211 return NULL; 1212 } 1213 KASSERT((m->m_flags & M_PKTHDR) != 0); 1214 1215 /* 1216 * Validate IPv6 destination address. 1217 * 1218 * The Responder must discard the Query without further processing 1219 * unless it is one of the Responder's unicast or anycast addresses, or 1220 * a link-local scope multicast address which the Responder has joined. 1221 * [icmp-name-lookups-07, Section 4.] 1222 */ 1223 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1224 /* XXX scopeid */ 1225 ss = pserialize_read_enter(); 1226 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1227 if (ifa != NULL) { 1228 ; /* unicast/anycast, fine */ 1229 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) { 1230 ; /* link-local multicast, fine */ 1231 } else { 1232 pserialize_read_exit(ss); 1233 goto bad; 1234 } 1235 pserialize_read_exit(ss); 1236 1237 /* validate query Subject field. */ 1238 qtype = ntohs(ni6->ni_qtype); 1239 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1240 switch (qtype) { 1241 case NI_QTYPE_NOOP: 1242 case NI_QTYPE_SUPTYPES: 1243 /* 07 draft */ 1244 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1245 break; 1246 /* FALLTHROUGH */ 1247 case NI_QTYPE_FQDN: 1248 case NI_QTYPE_NODEADDR: 1249 case NI_QTYPE_IPV4ADDR: 1250 switch (ni6->ni_code) { 1251 case ICMP6_NI_SUBJ_IPV6: 1252 #if ICMP6_NI_SUBJ_IPV6 != 0 1253 case 0: 1254 #endif 1255 /* 1256 * backward compatibility - try to accept 03 draft 1257 * format, where no Subject is present. 1258 */ 1259 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1260 subjlen == 0) { 1261 oldfqdn++; 1262 break; 1263 } 1264 #if ICMP6_NI_SUBJ_IPV6 != 0 1265 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1266 goto bad; 1267 #endif 1268 1269 if (subjlen != sizeof(sin6.sin6_addr)) 1270 goto bad; 1271 1272 /* 1273 * Validate Subject address. 1274 * 1275 * Not sure what exactly "address belongs to the node" 1276 * means in the spec, is it just unicast, or what? 1277 * 1278 * At this moment we consider Subject address as 1279 * "belong to the node" if the Subject address equals 1280 * to the IPv6 destination address; validation for 1281 * IPv6 destination address should have done enough 1282 * check for us. 1283 * 1284 * We do not do proxy at this moment. 1285 */ 1286 /* m_pulldown instead of copy? */ 1287 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1288 subjlen, (void *)&in6_subj); 1289 rcvif = m_get_rcvif(m, &s); 1290 if (__predict_false(rcvif == NULL)) 1291 goto bad; 1292 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1293 m_put_rcvif(rcvif, &s); 1294 goto bad; 1295 } 1296 m_put_rcvif(rcvif, &s); 1297 1298 subj = (char *)&in6_subj; 1299 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1300 break; 1301 1302 /* 1303 * XXX if we are to allow other cases, we should really 1304 * be careful about scope here. 1305 * basically, we should disallow queries toward IPv6 1306 * destination X with subject Y, if scope(X) > scope(Y). 1307 * if we allow scope(X) > scope(Y), it will result in 1308 * information leakage across scope boundary. 1309 */ 1310 goto bad; 1311 1312 case ICMP6_NI_SUBJ_FQDN: 1313 /* 1314 * Validate Subject name with gethostname(3). 1315 * 1316 * The behavior may need some debate, since: 1317 * - we are not sure if the node has FQDN as 1318 * hostname (returned by gethostname(3)). 1319 * - the code does wildcard match for truncated names. 1320 * however, we are not sure if we want to perform 1321 * wildcard match, if gethostname(3) side has 1322 * truncated hostname. 1323 */ 1324 n = ni6_nametodns(hostname, hostnamelen, 0); 1325 if (!n || n->m_next || n->m_len == 0) 1326 goto bad; 1327 IP6_EXTHDR_GET(subj, char *, m, 1328 off + sizeof(struct icmp6_nodeinfo), subjlen); 1329 if (subj == NULL) 1330 goto bad; 1331 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1332 n->m_len)) { 1333 goto bad; 1334 } 1335 m_freem(n); 1336 n = NULL; 1337 break; 1338 1339 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1340 default: 1341 goto bad; 1342 } 1343 break; 1344 } 1345 1346 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1347 switch (qtype) { 1348 case NI_QTYPE_FQDN: 1349 if ((icmp6_nodeinfo & 1) == 0) 1350 goto bad; 1351 break; 1352 case NI_QTYPE_NODEADDR: 1353 case NI_QTYPE_IPV4ADDR: 1354 if ((icmp6_nodeinfo & 2) == 0) 1355 goto bad; 1356 break; 1357 } 1358 1359 /* guess reply length */ 1360 switch (qtype) { 1361 case NI_QTYPE_NOOP: 1362 break; /* no reply data */ 1363 case NI_QTYPE_SUPTYPES: 1364 replylen += sizeof(u_int32_t); 1365 break; 1366 case NI_QTYPE_FQDN: 1367 /* will append an mbuf */ 1368 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1369 break; 1370 case NI_QTYPE_NODEADDR: 1371 addrs = ni6_addrs(ni6, &ifp, subj, &psref); 1372 replylen += addrs * 1373 (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1374 if (replylen > MCLBYTES) 1375 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1376 break; 1377 case NI_QTYPE_IPV4ADDR: 1378 /* unsupported - should respond with unknown Qtype? */ 1379 goto bad; 1380 default: 1381 /* 1382 * XXX: We must return a reply with the ICMP6 code 1383 * `unknown Qtype' in this case. However we regard the case 1384 * as an FQDN query for backward compatibility. 1385 * Older versions set a random value to this field, 1386 * so it rarely varies in the defined qtypes. 1387 * But the mechanism is not reliable... 1388 * maybe we should obsolete older versions. 1389 */ 1390 qtype = NI_QTYPE_FQDN; 1391 /* will append an mbuf */ 1392 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1393 oldfqdn++; 1394 break; 1395 } 1396 1397 /* allocate an mbuf to reply. */ 1398 MGETHDR(n, M_DONTWAIT, m->m_type); 1399 if (n == NULL) { 1400 goto bad; 1401 } 1402 m_move_pkthdr(n, m); 1403 if (replylen > MHLEN) { 1404 if (replylen > MCLBYTES) { 1405 /* 1406 * XXX: should we try to allocate more? But MCLBYTES 1407 * is probably much larger than IPV6_MMTU... 1408 */ 1409 goto bad; 1410 } 1411 MCLGET(n, M_DONTWAIT); 1412 if ((n->m_flags & M_EXT) == 0) { 1413 goto bad; 1414 } 1415 } 1416 n->m_pkthdr.len = n->m_len = replylen; 1417 1418 /* copy mbuf header and IPv6 + Node Information base headers */ 1419 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1420 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1421 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1422 1423 /* qtype dependent procedure */ 1424 switch (qtype) { 1425 case NI_QTYPE_NOOP: 1426 nni6->ni_code = ICMP6_NI_SUCCESS; 1427 nni6->ni_flags = 0; 1428 break; 1429 case NI_QTYPE_SUPTYPES: 1430 { 1431 u_int32_t v; 1432 nni6->ni_code = ICMP6_NI_SUCCESS; 1433 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1434 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1435 v = (u_int32_t)htonl(0x0000000f); 1436 memcpy(nni6 + 1, &v, sizeof(u_int32_t)); 1437 break; 1438 } 1439 case NI_QTYPE_FQDN: 1440 nni6->ni_code = ICMP6_NI_SUCCESS; 1441 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1442 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 1443 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1444 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1445 /* 1446 * XXX do we really have FQDN in variable "hostname"? 1447 */ 1448 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1449 if (n->m_next == NULL) 1450 goto bad; 1451 /* XXX we assume that n->m_next is not a chain */ 1452 if (n->m_next->m_next != NULL) 1453 goto bad; 1454 n->m_pkthdr.len += n->m_next->m_len; 1455 break; 1456 case NI_QTYPE_NODEADDR: 1457 { 1458 int lenlim, copied; 1459 1460 nni6->ni_code = ICMP6_NI_SUCCESS; 1461 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1462 sizeof(struct icmp6_nodeinfo); 1463 lenlim = M_TRAILINGSPACE(n); 1464 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1465 if_put(ifp, &psref); 1466 ifp = NULL; 1467 /* update mbuf length */ 1468 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1469 sizeof(struct icmp6_nodeinfo) + copied; 1470 break; 1471 } 1472 default: 1473 panic("%s: impossible", __func__); 1474 break; 1475 } 1476 1477 nni6->ni_type = ICMP6_NI_REPLY; 1478 m_freem(m); 1479 return n; 1480 1481 bad: 1482 if_put(ifp, &psref); 1483 m_freem(m); 1484 if (n) 1485 m_freem(n); 1486 return NULL; 1487 } 1488 1489 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1490 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1491 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1492 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1493 1494 /* 1495 * make a mbuf with DNS-encoded string. no compression support. 1496 * 1497 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1498 * treated as truncated name (two \0 at the end). this is a wild guess. 1499 * 1500 * old - return pascal string if non-zero 1501 */ 1502 static struct mbuf * 1503 ni6_nametodns(const char *name, int namelen, int old) 1504 { 1505 struct mbuf *m; 1506 char *cp, *ep; 1507 const char *p, *q; 1508 int i, len, nterm; 1509 1510 if (old) 1511 len = namelen + 1; 1512 else 1513 len = MCLBYTES; 1514 1515 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1516 MGET(m, M_DONTWAIT, MT_DATA); 1517 if (m && len > MLEN) { 1518 MCLGET(m, M_DONTWAIT); 1519 if ((m->m_flags & M_EXT) == 0) 1520 goto fail; 1521 } 1522 if (!m) 1523 goto fail; 1524 m->m_next = NULL; 1525 1526 if (old) { 1527 m->m_len = len; 1528 *mtod(m, char *) = namelen; 1529 memcpy(mtod(m, char *) + 1, name, namelen); 1530 return m; 1531 } else { 1532 m->m_len = 0; 1533 cp = mtod(m, char *); 1534 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1535 1536 /* if not certain about my name, return empty buffer */ 1537 if (namelen == 0) 1538 return m; 1539 1540 /* 1541 * guess if it looks like shortened hostname, or FQDN. 1542 * shortened hostname needs two trailing "\0". 1543 */ 1544 i = 0; 1545 for (p = name; p < name + namelen; p++) { 1546 if (*p == '.') 1547 i++; 1548 } 1549 if (i < 2) 1550 nterm = 2; 1551 else 1552 nterm = 1; 1553 1554 p = name; 1555 while (cp < ep && p < name + namelen) { 1556 i = 0; 1557 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1558 i++; 1559 /* result does not fit into mbuf */ 1560 if (cp + i + 1 >= ep) 1561 goto fail; 1562 /* 1563 * DNS label length restriction, RFC1035 page 8. 1564 * "i == 0" case is included here to avoid returning 1565 * 0-length label on "foo..bar". 1566 */ 1567 if (i <= 0 || i >= 64) 1568 goto fail; 1569 *cp++ = i; 1570 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1571 goto fail; 1572 while (i > 0) { 1573 if (!isalnum(*p) && *p != '-') 1574 goto fail; 1575 if (isupper(*p)) { 1576 *cp++ = tolower(*p); 1577 p++; 1578 } else 1579 *cp++ = *p++; 1580 i--; 1581 } 1582 p = q; 1583 if (p < name + namelen && *p == '.') 1584 p++; 1585 } 1586 /* termination */ 1587 if (cp + nterm >= ep) 1588 goto fail; 1589 while (nterm-- > 0) 1590 *cp++ = '\0'; 1591 m->m_len = cp - mtod(m, char *); 1592 return m; 1593 } 1594 1595 panic("should not reach here"); 1596 /* NOTREACHED */ 1597 1598 fail: 1599 if (m) 1600 m_freem(m); 1601 return NULL; 1602 } 1603 1604 /* 1605 * check if two DNS-encoded string matches. takes care of truncated 1606 * form (with \0\0 at the end). no compression support. 1607 * XXX upper/lowercase match (see RFC2065) 1608 */ 1609 static int 1610 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1611 { 1612 const char *a0, *b0; 1613 int l; 1614 1615 /* simplest case - need validation? */ 1616 if (alen == blen && memcmp(a, b, alen) == 0) 1617 return 1; 1618 1619 a0 = a; 1620 b0 = b; 1621 1622 /* termination is mandatory */ 1623 if (alen < 2 || blen < 2) 1624 return 0; 1625 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1626 return 0; 1627 alen--; 1628 blen--; 1629 1630 while (a - a0 < alen && b - b0 < blen) { 1631 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1632 return 0; 1633 1634 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1635 return 0; 1636 /* we don't support compression yet */ 1637 if (a[0] >= 64 || b[0] >= 64) 1638 return 0; 1639 1640 /* truncated case */ 1641 if (a[0] == 0 && a - a0 == alen - 1) 1642 return 1; 1643 if (b[0] == 0 && b - b0 == blen - 1) 1644 return 1; 1645 if (a[0] == 0 || b[0] == 0) 1646 return 0; 1647 1648 if (a[0] != b[0]) 1649 return 0; 1650 l = a[0]; 1651 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1652 return 0; 1653 if (memcmp(a + 1, b + 1, l) != 0) 1654 return 0; 1655 1656 a += 1 + l; 1657 b += 1 + l; 1658 } 1659 1660 if (a - a0 == alen && b - b0 == blen) 1661 return 1; 1662 else 1663 return 0; 1664 } 1665 1666 /* 1667 * calculate the number of addresses to be returned in the node info reply. 1668 */ 1669 static int 1670 ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj, 1671 struct psref *psref) 1672 { 1673 struct ifnet *ifp; 1674 struct in6_ifaddr *ia6; 1675 struct ifaddr *ifa; 1676 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1677 int addrs = 0, addrsofif, iffound = 0; 1678 int niflags = ni6->ni_flags; 1679 int s; 1680 1681 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1682 switch (ni6->ni_code) { 1683 case ICMP6_NI_SUBJ_IPV6: 1684 if (subj == NULL) /* must be impossible... */ 1685 return 0; 1686 subj_ip6 = (struct sockaddr_in6 *)subj; 1687 break; 1688 default: 1689 /* 1690 * XXX: we only support IPv6 subject address for 1691 * this Qtype. 1692 */ 1693 return 0; 1694 } 1695 } 1696 1697 s = pserialize_read_enter(); 1698 IFNET_READER_FOREACH(ifp) { 1699 addrsofif = 0; 1700 IFADDR_READER_FOREACH(ifa, ifp) { 1701 if (ifa->ifa_addr->sa_family != AF_INET6) 1702 continue; 1703 ia6 = (struct in6_ifaddr *)ifa; 1704 1705 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1706 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1707 &ia6->ia_addr.sin6_addr)) 1708 iffound = 1; 1709 1710 /* 1711 * IPv4-mapped addresses can only be returned by a 1712 * Node Information proxy, since they represent 1713 * addresses of IPv4-only nodes, which perforce do 1714 * not implement this protocol. 1715 * [icmp-name-lookups-07, Section 5.4] 1716 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1717 * this function at this moment. 1718 */ 1719 1720 /* What do we have to do about ::1? */ 1721 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1722 case IPV6_ADDR_SCOPE_LINKLOCAL: 1723 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1724 continue; 1725 break; 1726 case IPV6_ADDR_SCOPE_SITELOCAL: 1727 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1728 continue; 1729 break; 1730 case IPV6_ADDR_SCOPE_GLOBAL: 1731 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1732 continue; 1733 break; 1734 default: 1735 continue; 1736 } 1737 1738 /* 1739 * check if anycast is okay. 1740 * XXX: just experimental. not in the spec. 1741 */ 1742 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1743 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1744 continue; /* we need only unicast addresses */ 1745 1746 addrsofif++; /* count the address */ 1747 } 1748 if (iffound) { 1749 if_acquire(ifp, psref); 1750 pserialize_read_exit(s); 1751 *ifpp = ifp; 1752 return addrsofif; 1753 } 1754 1755 addrs += addrsofif; 1756 } 1757 pserialize_read_exit(s); 1758 1759 return addrs; 1760 } 1761 1762 static int 1763 ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1764 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1765 int resid) 1766 { 1767 struct ifnet *ifp; 1768 struct in6_ifaddr *ia6; 1769 struct ifaddr *ifa; 1770 struct ifnet *ifp_dep = NULL; 1771 int copied = 0, allow_deprecated = 0; 1772 u_char *cp = (u_char *)(nni6 + 1); 1773 int niflags = ni6->ni_flags; 1774 u_int32_t ltime; 1775 int s; 1776 1777 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1778 return 0; /* needless to copy */ 1779 1780 s = pserialize_read_enter(); 1781 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1782 again: 1783 1784 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1785 { 1786 IFADDR_READER_FOREACH(ifa, ifp) { 1787 if (ifa->ifa_addr->sa_family != AF_INET6) 1788 continue; 1789 ia6 = (struct in6_ifaddr *)ifa; 1790 1791 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1792 allow_deprecated == 0) { 1793 /* 1794 * prefererred address should be put before 1795 * deprecated addresses. 1796 */ 1797 1798 /* record the interface for later search */ 1799 if (ifp_dep == NULL) 1800 ifp_dep = ifp; 1801 1802 continue; 1803 } 1804 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1805 allow_deprecated != 0) 1806 continue; /* we now collect deprecated addrs */ 1807 1808 /* What do we have to do about ::1? */ 1809 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1810 case IPV6_ADDR_SCOPE_LINKLOCAL: 1811 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1812 continue; 1813 break; 1814 case IPV6_ADDR_SCOPE_SITELOCAL: 1815 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1816 continue; 1817 break; 1818 case IPV6_ADDR_SCOPE_GLOBAL: 1819 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1820 continue; 1821 break; 1822 default: 1823 continue; 1824 } 1825 1826 /* 1827 * check if anycast is okay. 1828 * XXX: just experimental. not in the spec. 1829 */ 1830 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1831 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1832 continue; 1833 1834 /* now we can copy the address */ 1835 if (resid < sizeof(struct in6_addr) + 1836 sizeof(u_int32_t)) { 1837 /* 1838 * We give up much more copy. 1839 * Set the truncate flag and return. 1840 */ 1841 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1842 goto out; 1843 } 1844 1845 /* 1846 * Set the TTL of the address. 1847 * The TTL value should be one of the following 1848 * according to the specification: 1849 * 1850 * 1. The remaining lifetime of a DHCP lease on the 1851 * address, or 1852 * 2. The remaining Valid Lifetime of a prefix from 1853 * which the address was derived through Stateless 1854 * Autoconfiguration. 1855 * 1856 * Note that we currently do not support stateful 1857 * address configuration by DHCPv6, so the former 1858 * case can't happen. 1859 * 1860 * TTL must be 2^31 > TTL >= 0. 1861 */ 1862 if (ia6->ia6_lifetime.ia6t_expire == 0) 1863 ltime = ND6_INFINITE_LIFETIME; 1864 else { 1865 if (ia6->ia6_lifetime.ia6t_expire > 1866 time_uptime) 1867 ltime = ia6->ia6_lifetime.ia6t_expire - 1868 time_uptime; 1869 else 1870 ltime = 0; 1871 } 1872 if (ltime > 0x7fffffff) 1873 ltime = 0x7fffffff; 1874 ltime = htonl(ltime); 1875 1876 memcpy(cp, <ime, sizeof(u_int32_t)); 1877 cp += sizeof(u_int32_t); 1878 1879 /* copy the address itself */ 1880 bcopy(&ia6->ia_addr.sin6_addr, cp, 1881 sizeof(struct in6_addr)); 1882 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1883 cp += sizeof(struct in6_addr); 1884 1885 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1886 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1887 } 1888 if (ifp0) /* we need search only on the specified IF */ 1889 break; 1890 } 1891 1892 if (allow_deprecated == 0 && ifp_dep != NULL) { 1893 ifp = ifp_dep; 1894 allow_deprecated = 1; 1895 1896 goto again; 1897 } 1898 out: 1899 pserialize_read_exit(s); 1900 return copied; 1901 } 1902 1903 /* 1904 * XXX almost dup'ed code with rip6_input. 1905 */ 1906 static int 1907 icmp6_rip6_input(struct mbuf **mp, int off) 1908 { 1909 struct mbuf *m = *mp; 1910 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1911 struct inpcb_hdr *inph; 1912 struct in6pcb *in6p; 1913 struct in6pcb *last = NULL; 1914 struct sockaddr_in6 rip6src; 1915 struct icmp6_hdr *icmp6; 1916 struct mbuf *n, *opts = NULL; 1917 1918 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1919 if (icmp6 == NULL) { 1920 /* m is already reclaimed */ 1921 return IPPROTO_DONE; 1922 } 1923 1924 /* 1925 * XXX: the address may have embedded scope zone ID, which should be 1926 * hidden from applications. 1927 */ 1928 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1929 if (sa6_recoverscope(&rip6src)) { 1930 m_freem(m); 1931 return IPPROTO_DONE; 1932 } 1933 1934 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1935 in6p = (struct in6pcb *)inph; 1936 if (in6p->in6p_af != AF_INET6) 1937 continue; 1938 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1939 continue; 1940 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1941 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1942 continue; 1943 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1944 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1945 continue; 1946 if (in6p->in6p_icmp6filt && 1947 ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1948 in6p->in6p_icmp6filt)) 1949 continue; 1950 1951 if (last == NULL) { 1952 ; 1953 } 1954 #ifdef IPSEC 1955 else if (ipsec_used && ipsec_in_reject(m, last)) { 1956 /* do not inject data into pcb */ 1957 } 1958 #endif 1959 else if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 1960 if (last->in6p_flags & IN6P_CONTROLOPTS) 1961 ip6_savecontrol(last, &opts, ip6, n); 1962 /* strip intermediate headers */ 1963 m_adj(n, off); 1964 if (sbappendaddr(&last->in6p_socket->so_rcv, 1965 sin6tosa(&rip6src), n, opts) == 0) { 1966 soroverflow(last->in6p_socket); 1967 m_freem(n); 1968 if (opts) 1969 m_freem(opts); 1970 } else { 1971 sorwakeup(last->in6p_socket); 1972 } 1973 opts = NULL; 1974 } 1975 1976 last = in6p; 1977 } 1978 1979 #ifdef IPSEC 1980 if (ipsec_used && last && ipsec_in_reject(m, last)) { 1981 m_freem(m); 1982 IP6_STATDEC(IP6_STAT_DELIVERED); 1983 /* do not inject data into pcb */ 1984 } else 1985 #endif 1986 if (last) { 1987 if (last->in6p_flags & IN6P_CONTROLOPTS) 1988 ip6_savecontrol(last, &opts, ip6, m); 1989 /* strip intermediate headers */ 1990 m_adj(m, off); 1991 if (sbappendaddr(&last->in6p_socket->so_rcv, 1992 sin6tosa(&rip6src), m, opts) == 0) { 1993 soroverflow(last->in6p_socket); 1994 m_freem(m); 1995 if (opts) 1996 m_freem(opts); 1997 } else { 1998 sorwakeup(last->in6p_socket); 1999 } 2000 } else { 2001 m_freem(m); 2002 IP6_STATDEC(IP6_STAT_DELIVERED); 2003 } 2004 return IPPROTO_DONE; 2005 } 2006 2007 /* 2008 * Reflect the ip6 packet back to the source. 2009 * OFF points to the icmp6 header, counted from the top of the mbuf. 2010 * 2011 * Note: RFC 1885 required that an echo reply should be truncated if it 2012 * did not fit in with (return) path MTU, and KAME code supported the 2013 * behavior. However, as a clarification after the RFC, this limitation 2014 * was removed in a revised version of the spec, RFC 2463. We had kept the 2015 * old behavior, with a (non-default) ifdef block, while the new version of 2016 * the spec was an internet-draft status, and even after the new RFC was 2017 * published. But it would rather make sense to clean the obsoleted part 2018 * up, and to make the code simpler at this stage. 2019 */ 2020 static void 2021 icmp6_reflect(struct mbuf *m, size_t off) 2022 { 2023 struct ip6_hdr *ip6; 2024 struct icmp6_hdr *icmp6; 2025 const struct in6_ifaddr *ia; 2026 const struct ip6aux *ip6a; 2027 int plen; 2028 int type, code; 2029 struct ifnet *outif = NULL; 2030 struct in6_addr origdst; 2031 struct ifnet *rcvif; 2032 int s; 2033 bool ip6_src_filled = false; 2034 2035 /* too short to reflect */ 2036 if (off < sizeof(struct ip6_hdr)) { 2037 nd6log(LOG_DEBUG, 2038 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2039 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2040 __FILE__, __LINE__); 2041 goto bad; 2042 } 2043 2044 /* 2045 * If there are extra headers between IPv6 and ICMPv6, strip 2046 * off that header first. 2047 */ 2048 CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN); 2049 if (off > sizeof(struct ip6_hdr)) { 2050 size_t l; 2051 struct ip6_hdr nip6; 2052 2053 l = off - sizeof(struct ip6_hdr); 2054 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2055 m_adj(m, l); 2056 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2057 if (m->m_len < l) { 2058 if ((m = m_pullup(m, l)) == NULL) 2059 return; 2060 } 2061 memcpy(mtod(m, void *), (void *)&nip6, sizeof(nip6)); 2062 } else { 2063 size_t l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2064 if (m->m_len < l) { 2065 if ((m = m_pullup(m, l)) == NULL) 2066 return; 2067 } 2068 } 2069 2070 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2071 ip6 = mtod(m, struct ip6_hdr *); 2072 ip6->ip6_nxt = IPPROTO_ICMPV6; 2073 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2074 type = icmp6->icmp6_type; /* keep type for statistics */ 2075 code = icmp6->icmp6_code; /* ditto. */ 2076 2077 origdst = ip6->ip6_dst; 2078 /* 2079 * ip6_input() drops a packet if its src is multicast. 2080 * So, the src is never multicast. 2081 */ 2082 ip6->ip6_dst = ip6->ip6_src; 2083 2084 /* 2085 * If the incoming packet was addressed directly to us (i.e. unicast), 2086 * use dst as the src for the reply. 2087 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2088 * (for example) when we encounter an error while forwarding procedure 2089 * destined to a duplicated address of ours. 2090 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2091 * procedure of an outgoing packet of our own, in which case we need 2092 * to search in the ifaddr list. 2093 */ 2094 if (IN6_IS_ADDR_MULTICAST(&origdst)) { 2095 ; 2096 } else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2097 if ((ip6a->ip6a_flags & 2098 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2099 ip6->ip6_src = ip6a->ip6a_src; 2100 ip6_src_filled = true; 2101 } 2102 } else { 2103 union { 2104 struct sockaddr_in6 sin6; 2105 struct sockaddr sa; 2106 } u; 2107 int _s; 2108 struct ifaddr *ifa; 2109 2110 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2111 2112 _s = pserialize_read_enter(); 2113 ifa = ifa_ifwithaddr(&u.sa); 2114 2115 if (ifa != NULL) { 2116 ia = ifatoia6(ifa); 2117 if ((ia->ia6_flags & 2118 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2119 ip6->ip6_src = ia->ia_addr.sin6_addr; 2120 ip6_src_filled = true; 2121 } 2122 } 2123 pserialize_read_exit(_s); 2124 } 2125 2126 if (!ip6_src_filled) { 2127 int e; 2128 struct sockaddr_in6 sin6; 2129 struct route ro; 2130 2131 /* 2132 * This case matches to multicasts, our anycast, or unicasts 2133 * that we do not own. Select a source address based on the 2134 * source address of the erroneous packet. 2135 */ 2136 /* zone ID should be embedded */ 2137 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2138 2139 memset(&ro, 0, sizeof(ro)); 2140 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2141 &ip6->ip6_src); 2142 rtcache_free(&ro); 2143 if (e != 0) { 2144 char ip6buf[INET6_ADDRSTRLEN]; 2145 nd6log(LOG_DEBUG, 2146 "source can't be determined: " 2147 "dst=%s, error=%d\n", 2148 IN6_PRINT(ip6buf, &sin6.sin6_addr), e); 2149 goto bad; 2150 } 2151 } 2152 2153 ip6->ip6_flow = 0; 2154 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2155 ip6->ip6_vfc |= IPV6_VERSION; 2156 ip6->ip6_nxt = IPPROTO_ICMPV6; 2157 rcvif = m_get_rcvif(m, &s); 2158 if (rcvif) { 2159 /* XXX: This may not be the outgoing interface */ 2160 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2161 } else { 2162 ip6->ip6_hlim = ip6_defhlim; 2163 } 2164 m_put_rcvif(rcvif, &s); 2165 2166 m->m_pkthdr.csum_flags = 0; 2167 icmp6->icmp6_cksum = 0; 2168 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2169 sizeof(struct ip6_hdr), plen); 2170 2171 /* 2172 * XXX option handling 2173 */ 2174 2175 m->m_flags &= ~(M_BCAST|M_MCAST); 2176 2177 /* 2178 * To avoid a "too big" situation at an intermediate router 2179 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2180 * Note that only echo and node information replies are affected, 2181 * since the length of ICMP6 errors is limited to the minimum MTU. 2182 */ 2183 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) != 0 && 2184 outif) 2185 icmp6_ifstat_inc(outif, ifs6_out_error); 2186 if (outif) 2187 icmp6_ifoutstat_inc(outif, type, code); 2188 2189 return; 2190 2191 bad: 2192 m_freem(m); 2193 return; 2194 } 2195 2196 static const char * 2197 icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6, 2198 struct in6_addr *dst6, struct in6_addr *tgt6) 2199 { 2200 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 2201 char ip6buft[INET6_ADDRSTRLEN]; 2202 2203 snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)", 2204 IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6), 2205 IN6_PRINT(ip6buft, tgt6)); 2206 return buf; 2207 } 2208 2209 static void 2210 icmp6_redirect_input(struct mbuf *m, int off) 2211 { 2212 struct ifnet *ifp; 2213 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2214 struct nd_redirect *nd_rd; 2215 int icmp6len = m->m_pkthdr.len - off; 2216 char *lladdr = NULL; 2217 int lladdrlen = 0; 2218 struct rtentry *rt = NULL; 2219 int is_router; 2220 int is_onlink; 2221 struct in6_addr src6 = ip6->ip6_src; 2222 struct in6_addr redtgt6; 2223 struct in6_addr reddst6; 2224 union nd_opts ndopts; 2225 struct psref psref; 2226 char ip6buf[INET6_ADDRSTRLEN]; 2227 char diagbuf[256]; 2228 2229 ifp = m_get_rcvif_psref(m, &psref); 2230 if (ifp == NULL) 2231 goto freeit; 2232 2233 /* XXX if we are router, we don't update route by icmp6 redirect */ 2234 if (ip6_forwarding) 2235 goto freeit; 2236 if (!icmp6_rediraccept) 2237 goto freeit; 2238 2239 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2240 if (nd_rd == NULL) { 2241 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2242 m_put_rcvif_psref(ifp, &psref); 2243 return; 2244 } 2245 redtgt6 = nd_rd->nd_rd_target; 2246 reddst6 = nd_rd->nd_rd_dst; 2247 2248 if (in6_setscope(&redtgt6, ifp, NULL) || 2249 in6_setscope(&reddst6, ifp, NULL)) { 2250 goto freeit; 2251 } 2252 2253 /* validation */ 2254 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2255 nd6log(LOG_ERR, 2256 "ICMP6 redirect sent from %s rejected; " 2257 "must be from linklocal\n", IN6_PRINT(ip6buf, &src6)); 2258 goto bad; 2259 } 2260 if (ip6->ip6_hlim != 255) { 2261 nd6log(LOG_ERR, 2262 "ICMP6 redirect sent from %s rejected; " 2263 "hlim=%d (must be 255)\n", 2264 IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim); 2265 goto bad; 2266 } 2267 2268 { 2269 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2270 struct sockaddr_in6 sin6; 2271 struct in6_addr *gw6; 2272 2273 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2274 rt = rtalloc1(sin6tosa(&sin6), 0); 2275 if (rt) { 2276 if (rt->rt_gateway == NULL || 2277 rt->rt_gateway->sa_family != AF_INET6) { 2278 nd6log(LOG_ERR, 2279 "ICMP6 redirect rejected; no route " 2280 "with inet6 gateway found for redirect dst: %s\n", 2281 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2282 &src6, &reddst6, &redtgt6)); 2283 rt_unref(rt); 2284 goto bad; 2285 } 2286 2287 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2288 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2289 nd6log(LOG_ERR, 2290 "ICMP6 redirect rejected; " 2291 "not equal to gw-for-src=%s (must be same): %s\n", 2292 IN6_PRINT(ip6buf, gw6), 2293 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2294 &src6, &reddst6, &redtgt6)); 2295 rt_unref(rt); 2296 goto bad; 2297 } 2298 } else { 2299 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2300 "no route found for redirect dst: %s\n", 2301 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2302 &src6, &reddst6, &redtgt6)); 2303 goto bad; 2304 } 2305 rt_unref(rt); 2306 rt = NULL; 2307 } 2308 2309 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2310 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2311 "redirect dst must be unicast: %s\n", 2312 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2313 &src6, &reddst6, &redtgt6)); 2314 goto bad; 2315 } 2316 2317 is_router = is_onlink = 0; 2318 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2319 is_router = 1; /* router case */ 2320 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2321 is_onlink = 1; /* on-link destination case */ 2322 if (!is_router && !is_onlink) { 2323 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2324 "neither router case nor onlink case: %s\n", 2325 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2326 &src6, &reddst6, &redtgt6)); 2327 goto bad; 2328 } 2329 /* validation passed */ 2330 2331 icmp6len -= sizeof(*nd_rd); 2332 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2333 if (nd6_options(&ndopts) < 0) { 2334 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2335 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2336 &src6, &reddst6, &redtgt6)); 2337 /* nd6_options have incremented stats */ 2338 goto freeit; 2339 } 2340 2341 if (ndopts.nd_opts_tgt_lladdr) { 2342 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2343 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2344 } 2345 2346 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2347 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2348 "(if %d, icmp6 packet %d): %s\n", 2349 IN6_PRINT(ip6buf, &redtgt6), 2350 ifp->if_addrlen, lladdrlen - 2, 2351 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2352 &src6, &reddst6, &redtgt6)); 2353 goto bad; 2354 } 2355 2356 /* RFC 2461 8.3 */ 2357 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2358 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2359 2360 m_put_rcvif_psref(ifp, &psref); 2361 ifp = NULL; 2362 2363 if (!is_onlink) { /* better router case. perform rtredirect. */ 2364 /* perform rtredirect */ 2365 struct sockaddr_in6 sdst; 2366 struct sockaddr_in6 sgw; 2367 struct sockaddr_in6 ssrc; 2368 unsigned long rtcount; 2369 struct rtentry *newrt = NULL; 2370 2371 /* 2372 * do not install redirect route, if the number of entries 2373 * is too much (> hiwat). note that, the node (= host) will 2374 * work just fine even if we do not install redirect route 2375 * (there will be additional hops, though). 2376 */ 2377 mutex_enter(&icmp6_mtx); 2378 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2379 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) { 2380 mutex_exit(&icmp6_mtx); 2381 goto freeit; 2382 } 2383 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) { 2384 mutex_exit(&icmp6_mtx); 2385 goto freeit; 2386 } else if (0 <= icmp6_redirect_lowat && 2387 rtcount > icmp6_redirect_lowat) { 2388 /* 2389 * XXX nuke a victim, install the new one. 2390 */ 2391 } 2392 2393 memset(&sdst, 0, sizeof(sdst)); 2394 memset(&sgw, 0, sizeof(sgw)); 2395 memset(&ssrc, 0, sizeof(ssrc)); 2396 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2397 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2398 sizeof(struct sockaddr_in6); 2399 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2400 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2401 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2402 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2403 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), &newrt); 2404 2405 if (newrt) { 2406 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2407 icmp6_redirect_timeout_q); 2408 rt_unref(newrt); 2409 } 2410 mutex_exit(&icmp6_mtx); 2411 } 2412 /* finally update cached route in each socket via pfctlinput */ 2413 { 2414 struct sockaddr_in6 sdst; 2415 2416 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2417 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2418 #if defined(IPSEC) 2419 if (ipsec_used) 2420 key_sa_routechange(sin6tosa(&sdst)); 2421 #endif 2422 } 2423 2424 freeit: 2425 if (ifp != NULL) 2426 m_put_rcvif_psref(ifp, &psref); 2427 m_freem(m); 2428 return; 2429 2430 bad: 2431 m_put_rcvif_psref(ifp, &psref); 2432 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2433 m_freem(m); 2434 } 2435 2436 void 2437 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2438 { 2439 struct ifnet *ifp; /* my outgoing interface */ 2440 struct in6_addr *ifp_ll6; 2441 struct in6_addr *nexthop; 2442 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2443 struct mbuf *m = NULL; /* newly allocated one */ 2444 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2445 struct nd_redirect *nd_rd; 2446 size_t maxlen; 2447 u_char *p; 2448 struct sockaddr_in6 src_sa; 2449 2450 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2451 2452 /* if we are not router, we don't send icmp6 redirect */ 2453 if (!ip6_forwarding) 2454 goto fail; 2455 2456 /* sanity check */ 2457 KASSERT(m0 != NULL); 2458 KASSERT(rt != NULL); 2459 2460 ifp = rt->rt_ifp; 2461 2462 /* 2463 * Address check: 2464 * the source address must identify a neighbor, and 2465 * the destination address must not be a multicast address 2466 * [RFC 2461, sec 8.2] 2467 */ 2468 sip6 = mtod(m0, struct ip6_hdr *); 2469 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2470 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2471 goto fail; 2472 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2473 goto fail; /* what should we do here? */ 2474 2475 /* rate limit */ 2476 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2477 goto fail; 2478 2479 /* 2480 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2481 * we almost always ask for an mbuf cluster for simplicity. 2482 * (MHLEN < IPV6_MMTU is almost always true) 2483 */ 2484 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2485 if (m && IPV6_MMTU >= MHLEN) { 2486 #if IPV6_MMTU >= MCLBYTES 2487 MEXTMALLOC(m, IPV6_MMTU, M_NOWAIT); 2488 #else 2489 MCLGET(m, M_DONTWAIT); 2490 #endif 2491 } 2492 2493 if (!m) 2494 goto fail; 2495 m_reset_rcvif(m); 2496 m->m_len = 0; 2497 maxlen = M_TRAILINGSPACE(m); 2498 maxlen = uimin(IPV6_MMTU, maxlen); 2499 2500 /* just for safety */ 2501 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct nd_redirect) + 2502 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2503 goto fail; 2504 } 2505 2506 { 2507 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2508 struct in6_ifaddr *ia; 2509 int s = pserialize_read_enter(); 2510 if ((ia = in6ifa_ifpforlinklocal(ifp, 2511 IN6_IFF_NOTREADY| 2512 IN6_IFF_ANYCAST)) == NULL) { 2513 pserialize_read_exit(s); 2514 goto fail; 2515 } 2516 ifp_ll6 = &ia->ia_addr.sin6_addr; 2517 pserialize_read_exit(s); 2518 } 2519 2520 /* get ip6 linklocal address for the router. */ 2521 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2522 struct sockaddr_in6 *sin6; 2523 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2524 nexthop = &sin6->sin6_addr; 2525 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2526 nexthop = NULL; 2527 } else 2528 nexthop = NULL; 2529 2530 /* ip6 */ 2531 ip6 = mtod(m, struct ip6_hdr *); 2532 ip6->ip6_flow = 0; 2533 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2534 ip6->ip6_vfc |= IPV6_VERSION; 2535 /* ip6->ip6_plen will be set later */ 2536 ip6->ip6_nxt = IPPROTO_ICMPV6; 2537 ip6->ip6_hlim = 255; 2538 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2539 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2540 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2541 2542 /* ND Redirect */ 2543 nd_rd = (struct nd_redirect *)(ip6 + 1); 2544 nd_rd->nd_rd_type = ND_REDIRECT; 2545 nd_rd->nd_rd_code = 0; 2546 nd_rd->nd_rd_reserved = 0; 2547 if (rt->rt_flags & RTF_GATEWAY) { 2548 /* 2549 * nd_rd->nd_rd_target must be a link-local address in 2550 * better router cases. 2551 */ 2552 if (!nexthop) 2553 goto fail; 2554 bcopy(nexthop, &nd_rd->nd_rd_target, 2555 sizeof(nd_rd->nd_rd_target)); 2556 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2557 sizeof(nd_rd->nd_rd_dst)); 2558 } else { 2559 /* make sure redtgt == reddst */ 2560 nexthop = &sip6->ip6_dst; 2561 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2562 sizeof(nd_rd->nd_rd_target)); 2563 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2564 sizeof(nd_rd->nd_rd_dst)); 2565 } 2566 2567 p = (u_char *)(nd_rd + 1); 2568 2569 { 2570 /* target lladdr option */ 2571 struct llentry *ln = NULL; 2572 int len, pad; 2573 struct nd_opt_hdr *nd_opt; 2574 char *lladdr; 2575 2576 ln = nd6_lookup(nexthop, ifp, false); 2577 if (ln == NULL) 2578 goto nolladdropt; 2579 len = sizeof(*nd_opt) + ifp->if_addrlen; 2580 len = (len + 7) & ~7; /* round by 8 */ 2581 pad = len - (sizeof(*nd_opt) + ifp->if_addrlen); 2582 2583 /* safety check */ 2584 if (len + (p - (u_char *)ip6) > maxlen) { 2585 LLE_RUNLOCK(ln); 2586 goto nolladdropt; 2587 } 2588 2589 if (ln->la_flags & LLE_VALID) { 2590 nd_opt = (struct nd_opt_hdr *)p; 2591 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2592 nd_opt->nd_opt_len = len >> 3; 2593 lladdr = (char *)(nd_opt + 1); 2594 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2595 memset(lladdr + ifp->if_addrlen, 0, pad); 2596 p += len; 2597 } 2598 LLE_RUNLOCK(ln); 2599 } 2600 nolladdropt: 2601 2602 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2603 2604 /* just to be safe */ 2605 if (m0->m_flags & M_DECRYPTED) 2606 goto noredhdropt; 2607 if (p - (u_char *)ip6 > maxlen) 2608 goto noredhdropt; 2609 2610 { 2611 /* redirected header option */ 2612 int len; 2613 struct nd_opt_rd_hdr *nd_opt_rh; 2614 2615 /* 2616 * compute the maximum size for icmp6 redirect header option. 2617 * XXX room for auth header? 2618 */ 2619 len = maxlen - (p - (u_char *)ip6); 2620 len &= ~7; 2621 2622 if (len < sizeof(*nd_opt_rh)) { 2623 goto noredhdropt; 2624 } 2625 2626 /* 2627 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2628 * about padding/truncate rule for the original IP packet. 2629 * From the discussion on IPv6imp in Feb 1999, 2630 * the consensus was: 2631 * - "attach as much as possible" is the goal 2632 * - pad if not aligned (original size can be guessed by 2633 * original ip6 header) 2634 * Following code adds the padding if it is simple enough, 2635 * and truncates if not. 2636 */ 2637 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2638 /* not enough room, truncate */ 2639 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2640 m0->m_pkthdr.len); 2641 } else { 2642 /* 2643 * enough room, truncate if not aligned. 2644 * we don't pad here for simplicity. 2645 */ 2646 int extra; 2647 2648 extra = m0->m_pkthdr.len % 8; 2649 if (extra) { 2650 /* truncate */ 2651 m_adj(m0, -extra); 2652 } 2653 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2654 } 2655 2656 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2657 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2658 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2659 nd_opt_rh->nd_opt_rh_len = len >> 3; 2660 p += sizeof(*nd_opt_rh); 2661 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2662 2663 /* connect m0 to m */ 2664 m->m_pkthdr.len += m0->m_pkthdr.len; 2665 m_cat(m, m0); 2666 m0 = NULL; 2667 } 2668 noredhdropt: 2669 if (m0) { 2670 m_freem(m0); 2671 m0 = NULL; 2672 } 2673 2674 /* XXX: clear embedded link IDs in the inner header */ 2675 in6_clearscope(&sip6->ip6_src); 2676 in6_clearscope(&sip6->ip6_dst); 2677 in6_clearscope(&nd_rd->nd_rd_target); 2678 in6_clearscope(&nd_rd->nd_rd_dst); 2679 2680 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2681 2682 nd_rd->nd_rd_cksum = 0; 2683 nd_rd->nd_rd_cksum = 2684 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2685 2686 /* send the packet to outside... */ 2687 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2688 icmp6_ifstat_inc(ifp, ifs6_out_error); 2689 2690 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2691 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2692 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2693 2694 return; 2695 2696 fail: 2697 if (m) 2698 m_freem(m); 2699 if (m0) 2700 m_freem(m0); 2701 } 2702 2703 /* 2704 * ICMPv6 socket option processing. 2705 */ 2706 int 2707 icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2708 { 2709 int error = 0; 2710 struct in6pcb *in6p = sotoin6pcb(so); 2711 2712 if (sopt->sopt_level != IPPROTO_ICMPV6) 2713 return rip6_ctloutput(op, so, sopt); 2714 2715 switch (op) { 2716 case PRCO_SETOPT: 2717 switch (sopt->sopt_name) { 2718 case ICMP6_FILTER: 2719 { 2720 struct icmp6_filter fil; 2721 2722 error = sockopt_get(sopt, &fil, sizeof(fil)); 2723 if (error) 2724 break; 2725 memcpy(in6p->in6p_icmp6filt, &fil, 2726 sizeof(struct icmp6_filter)); 2727 error = 0; 2728 break; 2729 } 2730 2731 default: 2732 error = ENOPROTOOPT; 2733 break; 2734 } 2735 break; 2736 2737 case PRCO_GETOPT: 2738 switch (sopt->sopt_name) { 2739 case ICMP6_FILTER: 2740 { 2741 if (in6p->in6p_icmp6filt == NULL) { 2742 error = EINVAL; 2743 break; 2744 } 2745 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2746 sizeof(struct icmp6_filter)); 2747 break; 2748 } 2749 2750 default: 2751 error = ENOPROTOOPT; 2752 break; 2753 } 2754 break; 2755 } 2756 2757 return error; 2758 } 2759 2760 /* 2761 * Perform rate limit check. 2762 * Returns 0 if it is okay to send the icmp6 packet. 2763 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2764 * limitation. 2765 * 2766 * XXX per-destination/type check necessary? 2767 */ 2768 static int 2769 icmp6_ratelimit( 2770 const struct in6_addr *dst, /* not used at this moment */ 2771 const int type, /* not used at this moment */ 2772 const int code) /* not used at this moment */ 2773 { 2774 int ret; 2775 2776 ret = 0; /* okay to send */ 2777 2778 /* PPS limit */ 2779 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2780 icmp6errppslim)) { 2781 /* The packet is subject to rate limit */ 2782 ret++; 2783 } 2784 2785 return ret; 2786 } 2787 2788 static struct rtentry * 2789 icmp6_mtudisc_clone(struct sockaddr *dst) 2790 { 2791 struct rtentry *rt; 2792 int error; 2793 2794 rt = rtalloc1(dst, 1); 2795 if (rt == NULL) 2796 return NULL; 2797 2798 /* If we didn't get a host route, allocate one */ 2799 if ((rt->rt_flags & RTF_HOST) == 0) { 2800 struct rtentry *nrt; 2801 2802 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2803 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2804 if (error) { 2805 rt_unref(rt); 2806 return NULL; 2807 } 2808 nrt->rt_rmx = rt->rt_rmx; 2809 rt_unref(rt); 2810 rt = nrt; 2811 } 2812 2813 mutex_enter(&icmp6_mtx); 2814 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2815 icmp6_mtudisc_timeout_q); 2816 mutex_exit(&icmp6_mtx); 2817 2818 if (error) { 2819 rt_unref(rt); 2820 return NULL; 2821 } 2822 2823 return rt; /* caller need to call rtfree() */ 2824 } 2825 2826 static void 2827 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2828 { 2829 struct rtentry *retrt; 2830 2831 KASSERT(rt != NULL); 2832 rt_assert_referenced(rt); 2833 2834 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2835 (RTF_DYNAMIC | RTF_HOST)) { 2836 rtrequest(RTM_DELETE, rt_getkey(rt), 2837 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt); 2838 rt_unref(rt); 2839 rt_free(retrt); 2840 } else { 2841 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2842 rt->rt_rmx.rmx_mtu = 0; 2843 } 2844 } 2845 2846 static void 2847 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2848 { 2849 struct rtentry *retrt; 2850 2851 KASSERT(rt != NULL); 2852 rt_assert_referenced(rt); 2853 2854 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2855 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2856 rtrequest(RTM_DELETE, rt_getkey(rt), 2857 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt); 2858 rt_unref(rt); 2859 rt_free(retrt); 2860 } 2861 } 2862 2863 #ifdef COMPAT_90 2864 /* 2865 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2866 */ 2867 static int 2868 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2869 { 2870 (void)&name; 2871 (void)&l; 2872 (void)&oname; 2873 2874 if (namelen != 0) 2875 return (EINVAL); 2876 2877 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2878 /*XXXUNCONST*/ 2879 __UNCONST(newp), newlen)); 2880 } 2881 #endif 2882 2883 static int 2884 sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2885 { 2886 2887 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2888 } 2889 2890 static int 2891 sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2892 { 2893 int error, tmp; 2894 struct sysctlnode node; 2895 2896 mutex_enter(&icmp6_mtx); 2897 2898 node = *rnode; 2899 node.sysctl_data = &tmp; 2900 tmp = icmp6_redirtimeout; 2901 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2902 if (error || newp == NULL) 2903 goto out; 2904 if (tmp < 0) { 2905 error = EINVAL; 2906 goto out; 2907 } 2908 icmp6_redirtimeout = tmp; 2909 2910 if (icmp6_redirect_timeout_q != NULL) { 2911 if (icmp6_redirtimeout == 0) { 2912 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2913 } else { 2914 rt_timer_queue_change(icmp6_redirect_timeout_q, 2915 icmp6_redirtimeout); 2916 } 2917 } else if (icmp6_redirtimeout > 0) { 2918 icmp6_redirect_timeout_q = 2919 rt_timer_queue_create(icmp6_redirtimeout); 2920 } 2921 error = 0; 2922 out: 2923 mutex_exit(&icmp6_mtx); 2924 return error; 2925 } 2926 2927 static void 2928 sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2929 { 2930 extern int nd6_maxqueuelen; /* defined in nd6.c */ 2931 2932 sysctl_createv(clog, 0, NULL, NULL, 2933 CTLFLAG_PERMANENT, 2934 CTLTYPE_NODE, "inet6", NULL, 2935 NULL, 0, NULL, 0, 2936 CTL_NET, PF_INET6, CTL_EOL); 2937 sysctl_createv(clog, 0, NULL, NULL, 2938 CTLFLAG_PERMANENT, 2939 CTLTYPE_NODE, "icmp6", 2940 SYSCTL_DESCR("ICMPv6 related settings"), 2941 NULL, 0, NULL, 0, 2942 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2943 2944 sysctl_createv(clog, 0, NULL, NULL, 2945 CTLFLAG_PERMANENT, 2946 CTLTYPE_STRUCT, "stats", 2947 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2948 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2949 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2950 ICMPV6CTL_STATS, CTL_EOL); 2951 sysctl_createv(clog, 0, NULL, NULL, 2952 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2953 CTLTYPE_INT, "rediraccept", 2954 SYSCTL_DESCR("Accept and process redirect messages"), 2955 NULL, 0, &icmp6_rediraccept, 0, 2956 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2957 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2958 sysctl_createv(clog, 0, NULL, NULL, 2959 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2960 CTLTYPE_INT, "redirtimeout", 2961 SYSCTL_DESCR("Redirect generated route lifetime"), 2962 sysctl_net_inet6_icmp6_redirtimeout, 0, 2963 &icmp6_redirtimeout, 0, 2964 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2965 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2966 #if 0 /* obsoleted */ 2967 sysctl_createv(clog, 0, NULL, NULL, 2968 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2969 CTLTYPE_INT, "errratelimit", NULL, 2970 NULL, 0, &icmp6_errratelimit, 0, 2971 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2972 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2973 #endif 2974 sysctl_createv(clog, 0, NULL, NULL, 2975 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2976 CTLTYPE_INT, "nd6_prune", 2977 SYSCTL_DESCR("Neighbor discovery prune interval"), 2978 NULL, 0, &nd6_prune, 0, 2979 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2980 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2981 sysctl_createv(clog, 0, NULL, NULL, 2982 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2983 CTLTYPE_INT, "nd6_delay", 2984 SYSCTL_DESCR("First probe delay time"), 2985 NULL, 0, &nd6_delay, 0, 2986 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2987 ICMPV6CTL_ND6_DELAY, CTL_EOL); 2988 sysctl_createv(clog, 0, NULL, NULL, 2989 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2990 CTLTYPE_INT, "nd6_umaxtries", 2991 SYSCTL_DESCR("Number of unicast discovery attempts"), 2992 NULL, 0, &nd6_umaxtries, 0, 2993 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2994 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 2995 sysctl_createv(clog, 0, NULL, NULL, 2996 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2997 CTLTYPE_INT, "nd6_mmaxtries", 2998 SYSCTL_DESCR("Number of multicast discovery attempts"), 2999 NULL, 0, &nd6_mmaxtries, 0, 3000 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3001 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 3002 sysctl_createv(clog, 0, NULL, NULL, 3003 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3004 CTLTYPE_INT, "nd6_useloopback", 3005 SYSCTL_DESCR("Use loopback interface for local traffic"), 3006 NULL, 0, &nd6_useloopback, 0, 3007 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3008 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 3009 #if 0 /* obsoleted */ 3010 sysctl_createv(clog, 0, NULL, NULL, 3011 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3012 CTLTYPE_INT, "nd6_proxyall", NULL, 3013 NULL, 0, &nd6_proxyall, 0, 3014 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3015 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 3016 #endif 3017 sysctl_createv(clog, 0, NULL, NULL, 3018 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3019 CTLTYPE_INT, "nodeinfo", 3020 SYSCTL_DESCR("Respond to node information requests"), 3021 NULL, 0, &icmp6_nodeinfo, 0, 3022 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3023 ICMPV6CTL_NODEINFO, CTL_EOL); 3024 sysctl_createv(clog, 0, NULL, NULL, 3025 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3026 CTLTYPE_INT, "errppslimit", 3027 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 3028 NULL, 0, &icmp6errppslim, 0, 3029 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3030 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 3031 sysctl_createv(clog, 0, NULL, NULL, 3032 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3033 CTLTYPE_INT, "nd6_maxnudhint", 3034 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 3035 NULL, 0, &nd6_maxnudhint, 0, 3036 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3037 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 3038 sysctl_createv(clog, 0, NULL, NULL, 3039 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3040 CTLTYPE_INT, "mtudisc_hiwat", 3041 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3042 NULL, 0, &icmp6_mtudisc_hiwat, 0, 3043 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3044 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 3045 sysctl_createv(clog, 0, NULL, NULL, 3046 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3047 CTLTYPE_INT, "mtudisc_lowat", 3048 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3049 NULL, 0, &icmp6_mtudisc_lowat, 0, 3050 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3051 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 3052 sysctl_createv(clog, 0, NULL, NULL, 3053 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3054 CTLTYPE_INT, "nd6_debug", 3055 SYSCTL_DESCR("Enable neighbor discovery debug output"), 3056 NULL, 0, &nd6_debug, 0, 3057 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3058 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 3059 #ifdef COMPAT_90 3060 sysctl_createv(clog, 0, NULL, NULL, 3061 CTLFLAG_PERMANENT, 3062 CTLTYPE_STRUCT, "nd6_drlist", 3063 SYSCTL_DESCR("Default router list"), 3064 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3065 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3066 OICMPV6CTL_ND6_DRLIST, CTL_EOL); 3067 sysctl_createv(clog, 0, NULL, NULL, 3068 CTLFLAG_PERMANENT, 3069 CTLTYPE_STRUCT, "nd6_prlist", 3070 SYSCTL_DESCR("Prefix list"), 3071 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3072 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3073 OICMPV6CTL_ND6_PRLIST, CTL_EOL); 3074 #endif 3075 sysctl_createv(clog, 0, NULL, NULL, 3076 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3077 CTLTYPE_INT, "maxqueuelen", 3078 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3079 NULL, 1, &nd6_maxqueuelen, 0, 3080 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3081 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3082 } 3083 3084 void 3085 icmp6_statinc(u_int stat) 3086 { 3087 3088 KASSERT(stat < ICMP6_NSTATS); 3089 ICMP6_STATINC(stat); 3090 } 3091