1 /* $NetBSD: icmp6.c,v 1.230 2018/04/14 17:55:47 maxv 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 1.230 2018/04/14 17:55:47 maxv 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/ipsec_var.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 #include <net/net_osdep.h> 118 119 extern struct domain inet6domain; 120 121 percpu_t *icmp6stat_percpu; 122 123 extern struct inpcbtable raw6cbtable; 124 extern int icmp6errppslim; 125 static int icmp6errpps_count = 0; 126 static struct timeval icmp6errppslim_last; 127 extern int icmp6_nodeinfo; 128 129 /* 130 * List of callbacks to notify when Path MTU changes are made. 131 */ 132 struct icmp6_mtudisc_callback { 133 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 134 void (*mc_func)(struct in6_addr *); 135 }; 136 137 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 138 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 139 140 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 141 extern int pmtu_expire; 142 143 /* XXX do these values make any sense? */ 144 static int icmp6_mtudisc_hiwat = 1280; 145 static int icmp6_mtudisc_lowat = 256; 146 147 /* 148 * keep track of # of redirect routes. 149 */ 150 static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 151 152 /* XXX experimental, turned off */ 153 static int icmp6_redirect_hiwat = -1; 154 static int icmp6_redirect_lowat = -1; 155 156 /* Protect mtudisc and redirect stuffs */ 157 static kmutex_t icmp6_mtx __cacheline_aligned; 158 159 static void icmp6_errcount(u_int, int, int); 160 static int icmp6_rip6_input(struct mbuf **, int); 161 static void icmp6_reflect(struct mbuf *, size_t); 162 static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 163 static const char *icmp6_redirect_diag(char *, size_t, struct in6_addr *, 164 struct in6_addr *, struct in6_addr *); 165 static void icmp6_redirect_input(struct mbuf *, int); 166 static struct mbuf *ni6_input(struct mbuf *, int); 167 static struct mbuf *ni6_nametodns(const char *, int, int); 168 static int ni6_dnsmatch(const char *, int, const char *, int); 169 static int ni6_addrs(struct icmp6_nodeinfo *, struct ifnet **, char *, 170 struct psref *); 171 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 172 struct ifnet *, int); 173 static int icmp6_notify_error(struct mbuf *, int, int, int); 174 static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 175 static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 176 static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 177 static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 178 179 /* workqueue-based pr_input */ 180 static struct wqinput *icmp6_wqinput; 181 static void _icmp6_input(struct mbuf *m, int off, int proto); 182 183 void 184 icmp6_init(void) 185 { 186 187 sysctl_net_inet6_icmp6_setup(NULL); 188 mld_init(); 189 190 mutex_init(&icmp6_mtx, MUTEX_DEFAULT, IPL_NONE); 191 mutex_enter(&icmp6_mtx); 192 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 193 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 194 mutex_exit(&icmp6_mtx); 195 196 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS); 197 198 icmp6_wqinput = wqinput_create("icmp6", _icmp6_input); 199 } 200 201 static void 202 icmp6_errcount(u_int base, int type, int code) 203 { 204 switch (type) { 205 case ICMP6_DST_UNREACH: 206 switch (code) { 207 case ICMP6_DST_UNREACH_NOROUTE: 208 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE); 209 return; 210 case ICMP6_DST_UNREACH_ADMIN: 211 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN); 212 return; 213 case ICMP6_DST_UNREACH_BEYONDSCOPE: 214 ICMP6_STATINC(base + 215 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE); 216 return; 217 case ICMP6_DST_UNREACH_ADDR: 218 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR); 219 return; 220 case ICMP6_DST_UNREACH_NOPORT: 221 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT); 222 return; 223 } 224 break; 225 case ICMP6_PACKET_TOO_BIG: 226 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG); 227 return; 228 case ICMP6_TIME_EXCEEDED: 229 switch (code) { 230 case ICMP6_TIME_EXCEED_TRANSIT: 231 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT); 232 return; 233 case ICMP6_TIME_EXCEED_REASSEMBLY: 234 ICMP6_STATINC(base + 235 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY); 236 return; 237 } 238 break; 239 case ICMP6_PARAM_PROB: 240 switch (code) { 241 case ICMP6_PARAMPROB_HEADER: 242 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER); 243 return; 244 case ICMP6_PARAMPROB_NEXTHEADER: 245 ICMP6_STATINC(base + 246 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER); 247 return; 248 case ICMP6_PARAMPROB_OPTION: 249 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION); 250 return; 251 } 252 break; 253 case ND_REDIRECT: 254 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT); 255 return; 256 } 257 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN); 258 } 259 260 /* 261 * Register a Path MTU Discovery callback. 262 */ 263 void 264 icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *)) 265 { 266 struct icmp6_mtudisc_callback *mc, *new; 267 268 new = kmem_alloc(sizeof(*mc), KM_SLEEP); 269 270 mutex_enter(&icmp6_mtx); 271 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 272 mc = LIST_NEXT(mc, mc_list)) { 273 if (mc->mc_func == func) { 274 mutex_exit(&icmp6_mtx); 275 kmem_free(new, sizeof(*mc)); 276 return; 277 } 278 } 279 280 new->mc_func = func; 281 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, new, mc_list); 282 mutex_exit(&icmp6_mtx); 283 } 284 285 /* 286 * A wrapper function for icmp6_error() necessary when the erroneous packet 287 * may not contain enough scope zone information. 288 */ 289 void 290 icmp6_error2(struct mbuf *m, int type, int code, int param, 291 struct ifnet *ifp) 292 { 293 struct ip6_hdr *ip6; 294 295 KASSERT(ifp != NULL); 296 297 if (m->m_len < sizeof(struct ip6_hdr)) { 298 m = m_pullup(m, sizeof(struct ip6_hdr)); 299 if (m == NULL) 300 return; 301 } 302 303 ip6 = mtod(m, struct ip6_hdr *); 304 305 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 306 goto out; 307 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 308 goto out; 309 310 icmp6_error(m, type, code, param); 311 return; 312 313 out: 314 m_freem(m); 315 } 316 317 /* 318 * Generate an error packet of type error in response to bad IP6 packet. 319 */ 320 void 321 icmp6_error(struct mbuf *m, int type, int code, int param) 322 { 323 struct ip6_hdr *oip6, *nip6; 324 struct icmp6_hdr *icmp6; 325 u_int preplen; 326 int off; 327 int nxt; 328 329 ICMP6_STATINC(ICMP6_STAT_ERROR); 330 331 /* count per-type-code statistics */ 332 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); 333 334 if (m->m_flags & M_DECRYPTED) { 335 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 336 goto freeit; 337 } 338 339 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && 340 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) 341 return; 342 oip6 = mtod(m, struct ip6_hdr *); 343 344 /* 345 * If the destination address of the erroneous packet is a multicast 346 * address, or the packet was sent using link-layer multicast, 347 * we should basically suppress sending an error (RFC 2463, Section 348 * 2.4). 349 * We have two exceptions (the item e.2 in that section): 350 * - the Packet Too Big message can be sent for path MTU discovery. 351 * - the Parameter Problem Message that can be allowed an icmp6 error 352 * in the option type field. This check has been done in 353 * ip6_unknown_opt(), so we can just check the type and code. 354 */ 355 if ((m->m_flags & (M_BCAST|M_MCAST) || 356 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 357 (type != ICMP6_PACKET_TOO_BIG && 358 (type != ICMP6_PARAM_PROB || 359 code != ICMP6_PARAMPROB_OPTION))) 360 goto freeit; 361 362 /* 363 * RFC 2463, 2.4 (e.5): source address check. 364 * XXX: the case of anycast source? 365 */ 366 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 367 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 368 goto freeit; 369 370 /* 371 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 372 * don't do it. 373 */ 374 nxt = -1; 375 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 376 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 377 struct icmp6_hdr *icp; 378 379 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 380 sizeof(*icp)); 381 if (icp == NULL) { 382 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 383 return; 384 } 385 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 386 icp->icmp6_type == ND_REDIRECT) { 387 /* 388 * ICMPv6 error 389 * Special case: for redirect (which is 390 * informational) we must not send icmp6 error. 391 */ 392 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 393 goto freeit; 394 } else { 395 /* ICMPv6 informational - send the error */ 396 } 397 } else { 398 /* non-ICMPv6 - send the error */ 399 } 400 401 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 402 403 /* Finally, do rate limitation check. */ 404 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 405 ICMP6_STATINC(ICMP6_STAT_TOOFREQ); 406 goto freeit; 407 } 408 409 /* 410 * OK, ICMP6 can be generated. 411 */ 412 413 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 414 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 415 416 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 417 M_PREPEND(m, preplen, M_DONTWAIT); 418 if (m && M_UNWRITABLE(m, preplen)) 419 m = m_pullup(m, preplen); 420 if (m == NULL) { 421 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__); 422 return; 423 } 424 425 nip6 = mtod(m, struct ip6_hdr *); 426 nip6->ip6_src = oip6->ip6_src; 427 nip6->ip6_dst = oip6->ip6_dst; 428 429 in6_clearscope(&oip6->ip6_src); 430 in6_clearscope(&oip6->ip6_dst); 431 432 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 433 icmp6->icmp6_type = type; 434 icmp6->icmp6_code = code; 435 icmp6->icmp6_pptr = htonl((u_int32_t)param); 436 437 /* 438 * icmp6_reflect() is designed to be in the input path. 439 * icmp6_error() can be called from both input and output path, 440 * and if we are in output path rcvif could contain bogus value. 441 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 442 * information in ip header (nip6). 443 */ 444 m_reset_rcvif(m); 445 446 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 447 448 /* header order: IPv6 - ICMPv6 */ 449 icmp6_reflect(m, sizeof(struct ip6_hdr)); 450 451 return; 452 453 freeit: 454 /* 455 * If we can't tell whether or not we can generate ICMP6, free it. 456 */ 457 m_freem(m); 458 } 459 460 /* 461 * Process a received ICMP6 message. 462 */ 463 static void 464 _icmp6_input(struct mbuf *m, int off, int proto) 465 { 466 struct mbuf *n; 467 struct ip6_hdr *ip6, *nip6; 468 struct icmp6_hdr *icmp6, *nicmp6; 469 int icmp6len = m->m_pkthdr.len - off; 470 int code, sum; 471 struct ifnet *rcvif; 472 struct psref psref; 473 char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN]; 474 475 rcvif = m_get_rcvif_psref(m, &psref); 476 if (__predict_false(rcvif == NULL)) 477 goto freeit; 478 479 #define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 480 KASSERT(ICMP6_MAXLEN < MCLBYTES); 481 icmp6_ifstat_inc(rcvif, ifs6_in_msg); 482 483 /* 484 * Locate icmp6 structure in mbuf, and check 485 * that not corrupted and of at least minimum length 486 */ 487 488 if (icmp6len < sizeof(struct icmp6_hdr)) { 489 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 490 icmp6_ifstat_inc(rcvif, ifs6_in_error); 491 goto freeit; 492 } 493 494 if (m->m_len < sizeof(struct ip6_hdr)) { 495 m = m_pullup(m, sizeof(struct ip6_hdr)); 496 if (m == NULL) { 497 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 498 icmp6_ifstat_inc(rcvif, ifs6_in_error); 499 goto freeit; 500 } 501 } 502 503 ip6 = mtod(m, struct ip6_hdr *); 504 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 505 if (icmp6 == NULL) { 506 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 507 icmp6_ifstat_inc(rcvif, ifs6_in_error); 508 goto freeit; 509 } 510 511 /* 512 * Enforce alignment requirements that are violated in 513 * some cases, see kern/50766 for details. 514 */ 515 if (IP6_HDR_ALIGNED_P(icmp6) == 0) { 516 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0); 517 if (m == NULL) { 518 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 519 icmp6_ifstat_inc(rcvif, ifs6_in_error); 520 goto freeit; 521 } 522 ip6 = mtod(m, struct ip6_hdr *); 523 icmp6 = (struct icmp6_hdr *)(mtod(m, char *) + off); 524 } 525 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 526 527 /* 528 * calculate the checksum 529 */ 530 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 531 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 532 icmp6->icmp6_type, sum, IN6_PRINT(ip6buf, &ip6->ip6_src)); 533 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 534 icmp6_ifstat_inc(rcvif, ifs6_in_error); 535 goto freeit; 536 } 537 538 #if defined(NFAITH) && 0 < NFAITH 539 if (faithprefix(&ip6->ip6_dst)) { 540 /* 541 * Deliver very specific ICMP6 type only. 542 * This is important to deliver TOOBIG. Otherwise PMTUD 543 * will not work. 544 */ 545 switch (icmp6->icmp6_type) { 546 case ICMP6_DST_UNREACH: 547 case ICMP6_PACKET_TOO_BIG: 548 case ICMP6_TIME_EXCEEDED: 549 break; 550 default: 551 goto freeit; 552 } 553 } 554 #endif 555 556 code = icmp6->icmp6_code; 557 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 558 559 switch (icmp6->icmp6_type) { 560 case ICMP6_DST_UNREACH: 561 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 562 switch (code) { 563 case ICMP6_DST_UNREACH_NOROUTE: 564 code = PRC_UNREACH_NET; 565 break; 566 case ICMP6_DST_UNREACH_ADMIN: 567 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 568 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 569 break; 570 case ICMP6_DST_UNREACH_ADDR: 571 code = PRC_HOSTDEAD; 572 break; 573 case ICMP6_DST_UNREACH_BEYONDSCOPE: 574 /* I mean "source address was incorrect." */ 575 code = PRC_UNREACH_NET; 576 break; 577 case ICMP6_DST_UNREACH_NOPORT: 578 code = PRC_UNREACH_PORT; 579 break; 580 default: 581 goto badcode; 582 } 583 goto deliver; 584 585 case ICMP6_PACKET_TOO_BIG: 586 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 587 588 /* 589 * MTU is checked in icmp6_mtudisc. 590 */ 591 code = PRC_MSGSIZE; 592 593 /* 594 * Updating the path MTU will be done after examining 595 * intermediate extension headers. 596 */ 597 goto deliver; 598 599 case ICMP6_TIME_EXCEEDED: 600 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 601 switch (code) { 602 case ICMP6_TIME_EXCEED_TRANSIT: 603 code = PRC_TIMXCEED_INTRANS; 604 break; 605 case ICMP6_TIME_EXCEED_REASSEMBLY: 606 code = PRC_TIMXCEED_REASS; 607 break; 608 default: 609 goto badcode; 610 } 611 goto deliver; 612 613 case ICMP6_PARAM_PROB: 614 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 615 switch (code) { 616 case ICMP6_PARAMPROB_NEXTHEADER: 617 code = PRC_UNREACH_PROTOCOL; 618 break; 619 case ICMP6_PARAMPROB_HEADER: 620 case ICMP6_PARAMPROB_OPTION: 621 code = PRC_PARAMPROB; 622 break; 623 default: 624 goto badcode; 625 } 626 goto deliver; 627 628 case ICMP6_ECHO_REQUEST: 629 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 630 if (code != 0) 631 goto badcode; 632 /* 633 * Copy mbuf to send to two data paths: userland socket(s), 634 * and to the querier (echo reply). 635 * m: a copy for socket, n: a copy for querier 636 * 637 * If the first mbuf is shared, or the first mbuf is too short, 638 * copy the first part of the data into a fresh mbuf. 639 * Otherwise, we will wrongly overwrite both copies. 640 */ 641 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 642 /* Give up local */ 643 n = m; 644 m = NULL; 645 } else if (M_READONLY(n) || 646 n->m_len < off + sizeof(struct icmp6_hdr)) { 647 struct mbuf *n0 = n; 648 649 /* 650 * Prepare an internal mbuf. m_pullup() doesn't 651 * always copy the length we specified. 652 */ 653 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 654 /* Give up local */ 655 n = m; 656 m = NULL; 657 } 658 m_freem(n0); 659 } 660 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 661 sizeof(*nicmp6)); 662 if (nicmp6 == NULL) 663 goto freeit; 664 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 665 nicmp6->icmp6_code = 0; 666 if (n) { 667 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 668 icmp6s[ICMP6_STAT_REFLECT]++; 669 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 670 ICMP6_STAT_PUTREF(); 671 icmp6_reflect(n, off); 672 } 673 if (!m) 674 goto freeit; 675 break; 676 677 case ICMP6_ECHO_REPLY: 678 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 679 if (code != 0) 680 goto badcode; 681 break; 682 683 case MLD_LISTENER_QUERY: 684 case MLD_LISTENER_REPORT: 685 if (icmp6len < sizeof(struct mld_hdr)) 686 goto badlen; 687 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 688 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 689 else 690 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 691 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 692 /* give up local */ 693 mld_input(m, off); 694 m = NULL; 695 goto freeit; 696 } 697 mld_input(n, off); 698 /* m stays. */ 699 break; 700 701 case MLD_LISTENER_DONE: 702 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 703 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 704 goto badlen; 705 break; /* nothing to be done in kernel */ 706 707 case MLD_MTRACE_RESP: 708 case MLD_MTRACE: 709 /* XXX: these two are experimental. not officially defined. */ 710 /* XXX: per-interface statistics? */ 711 break; /* just pass it to applications */ 712 713 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 714 { 715 enum { WRU, FQDN } mode; 716 717 if (!icmp6_nodeinfo) 718 break; 719 720 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 721 mode = WRU; 722 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 723 mode = FQDN; 724 else 725 goto badlen; 726 727 if (mode == FQDN) { 728 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 729 if (n) 730 n = ni6_input(n, off); 731 } else { 732 u_char *p; 733 int maxhlen; 734 735 if ((icmp6_nodeinfo & 5) != 5) 736 break; 737 738 if (code != 0) 739 goto badcode; 740 MGETHDR(n, M_DONTWAIT, m->m_type); 741 if (n && ICMP6_MAXLEN > MHLEN) { 742 MCLGET(n, M_DONTWAIT); 743 if ((n->m_flags & M_EXT) == 0) { 744 m_free(n); 745 n = NULL; 746 } 747 } 748 if (n == NULL) { 749 /* Give up remote */ 750 break; 751 } 752 m_reset_rcvif(n); 753 n->m_len = 0; 754 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 755 if (maxhlen < 0) { 756 m_free(n); 757 break; 758 } 759 if (maxhlen > hostnamelen) 760 maxhlen = hostnamelen; 761 /* 762 * Copy IPv6 and ICMPv6 only. 763 */ 764 nip6 = mtod(n, struct ip6_hdr *); 765 memcpy(nip6, ip6, sizeof(struct ip6_hdr)); 766 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 767 memcpy(nicmp6, icmp6, sizeof(struct icmp6_hdr)); 768 769 p = (u_char *)(nicmp6 + 1); 770 memset(p, 0, 4); 771 memcpy(p + 4, hostname, maxhlen); /* meaningless TTL */ 772 773 M_COPY_PKTHDR(n, m); /* just for rcvif */ 774 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 775 sizeof(struct icmp6_hdr) + 4 + maxhlen; 776 nicmp6->icmp6_type = ICMP6_WRUREPLY; 777 nicmp6->icmp6_code = 0; 778 } 779 if (n) { 780 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 781 icmp6s[ICMP6_STAT_REFLECT]++; 782 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 783 ICMP6_STAT_PUTREF(); 784 icmp6_reflect(n, sizeof(struct ip6_hdr)); 785 } 786 break; 787 } 788 789 case ICMP6_WRUREPLY: 790 if (code != 0) 791 goto badcode; 792 break; 793 794 case ND_ROUTER_SOLICIT: 795 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 796 if (code != 0) 797 goto badcode; 798 if (icmp6len < sizeof(struct nd_router_solicit)) 799 goto badlen; 800 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 801 /* give up local */ 802 nd6_rs_input(m, off, icmp6len); 803 m = NULL; 804 goto freeit; 805 } 806 nd6_rs_input(n, off, icmp6len); 807 /* m stays. */ 808 break; 809 810 case ND_ROUTER_ADVERT: 811 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 812 if (code != 0) 813 goto badcode; 814 if (icmp6len < sizeof(struct nd_router_advert)) 815 goto badlen; 816 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 817 /* give up local */ 818 nd6_ra_input(m, off, icmp6len); 819 m = NULL; 820 goto freeit; 821 } 822 nd6_ra_input(n, off, icmp6len); 823 /* m stays. */ 824 break; 825 826 case ND_NEIGHBOR_SOLICIT: 827 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 828 if (code != 0) 829 goto badcode; 830 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 831 goto badlen; 832 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 833 /* give up local */ 834 nd6_ns_input(m, off, icmp6len); 835 m = NULL; 836 goto freeit; 837 } 838 nd6_ns_input(n, off, icmp6len); 839 /* m stays. */ 840 break; 841 842 case ND_NEIGHBOR_ADVERT: 843 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 844 if (code != 0) 845 goto badcode; 846 if (icmp6len < sizeof(struct nd_neighbor_advert)) 847 goto badlen; 848 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 849 /* give up local */ 850 nd6_na_input(m, off, icmp6len); 851 m = NULL; 852 goto freeit; 853 } 854 nd6_na_input(n, off, icmp6len); 855 /* m stays. */ 856 break; 857 858 case ND_REDIRECT: 859 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 860 if (code != 0) 861 goto badcode; 862 if (icmp6len < sizeof(struct nd_redirect)) 863 goto badlen; 864 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 865 /* give up local */ 866 icmp6_redirect_input(m, off); 867 m = NULL; 868 goto freeit; 869 } 870 icmp6_redirect_input(n, off); 871 /* m stays. */ 872 break; 873 874 case ICMP6_ROUTER_RENUMBERING: 875 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 876 code != ICMP6_ROUTER_RENUMBERING_RESULT) 877 goto badcode; 878 if (icmp6len < sizeof(struct icmp6_router_renum)) 879 goto badlen; 880 break; 881 882 default: 883 nd6log(LOG_DEBUG, 884 "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 885 icmp6->icmp6_type, 886 IN6_PRINT(ip6buf, &ip6->ip6_src), 887 IN6_PRINT(ip6buf2, &ip6->ip6_dst), 888 rcvif ? rcvif->if_index : 0); 889 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 890 /* ICMPv6 error: MUST deliver it by spec... */ 891 code = PRC_NCMDS; 892 /* deliver */ 893 } else { 894 /* ICMPv6 informational: MUST not deliver */ 895 break; 896 } 897 deliver: 898 if (icmp6_notify_error(m, off, icmp6len, code)) { 899 /* In this case, m should've been freed. */ 900 m_put_rcvif_psref(rcvif, &psref); 901 return; 902 } 903 break; 904 905 badcode: 906 ICMP6_STATINC(ICMP6_STAT_BADCODE); 907 break; 908 909 badlen: 910 ICMP6_STATINC(ICMP6_STAT_BADLEN); 911 break; 912 } 913 m_put_rcvif_psref(rcvif, &psref); 914 915 /* deliver the packet to appropriate sockets */ 916 icmp6_rip6_input(&m, off); 917 918 return; 919 920 freeit: 921 m_put_rcvif_psref(rcvif, &psref); 922 m_freem(m); 923 return; 924 } 925 926 int 927 icmp6_input(struct mbuf **mp, int *offp, int proto) 928 { 929 930 wqinput_input(icmp6_wqinput, *mp, *offp, proto); 931 932 return IPPROTO_DONE; 933 } 934 935 static int 936 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 937 { 938 struct icmp6_hdr *icmp6; 939 struct ip6_hdr *eip6; 940 u_int32_t notifymtu; 941 struct sockaddr_in6 icmp6src, icmp6dst; 942 943 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 944 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 945 goto freeit; 946 } 947 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 948 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 949 if (icmp6 == NULL) { 950 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 951 return (-1); 952 } 953 eip6 = (struct ip6_hdr *)(icmp6 + 1); 954 955 /* Detect the upper level protocol */ 956 { 957 void (*ctlfunc)(int, struct sockaddr *, void *); 958 u_int8_t nxt = eip6->ip6_nxt; 959 int eoff = off + sizeof(struct icmp6_hdr) + 960 sizeof(struct ip6_hdr); 961 struct ip6ctlparam ip6cp; 962 struct in6_addr *finaldst = NULL; 963 int icmp6type = icmp6->icmp6_type; 964 struct ip6_frag *fh; 965 struct ip6_rthdr *rth; 966 struct ifnet *rcvif; 967 int s; 968 969 while (1) { /* XXX: should avoid infinite loop explicitly? */ 970 struct ip6_ext *eh; 971 972 switch (nxt) { 973 case IPPROTO_HOPOPTS: 974 case IPPROTO_DSTOPTS: 975 case IPPROTO_AH: 976 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 977 eoff, sizeof(*eh)); 978 if (eh == NULL) { 979 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 980 return (-1); 981 } 982 983 if (nxt == IPPROTO_AH) 984 eoff += (eh->ip6e_len + 2) << 2; 985 else 986 eoff += (eh->ip6e_len + 1) << 3; 987 nxt = eh->ip6e_nxt; 988 break; 989 case IPPROTO_ROUTING: 990 /* Ignore the option. */ 991 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 992 eoff, sizeof(*rth)); 993 if (rth == NULL) { 994 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 995 return (-1); 996 } 997 998 eoff += (rth->ip6r_len + 1) << 3; 999 nxt = rth->ip6r_nxt; 1000 break; 1001 case IPPROTO_FRAGMENT: 1002 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1003 eoff, sizeof(*fh)); 1004 if (fh == NULL) { 1005 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1006 return (-1); 1007 } 1008 /* 1009 * Data after a fragment header is meaningless 1010 * unless it is the first fragment, but 1011 * we'll go to the notify label for path MTU 1012 * discovery. 1013 */ 1014 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1015 goto notify; 1016 1017 eoff += sizeof(struct ip6_frag); 1018 nxt = fh->ip6f_nxt; 1019 break; 1020 default: 1021 /* 1022 * This case includes ESP and the No Next 1023 * Header. In such cases going to the notify 1024 * label does not have any meaning 1025 * (i.e. ctlfunc will be NULL), but we go 1026 * anyway since we might have to update 1027 * path MTU information. 1028 */ 1029 goto notify; 1030 } 1031 } 1032 notify: 1033 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1034 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1035 if (icmp6 == NULL) { 1036 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1037 return (-1); 1038 } 1039 1040 /* 1041 * retrieve parameters from the inner IPv6 header, and convert 1042 * them into sockaddr structures. 1043 * XXX: there is no guarantee that the source or destination 1044 * addresses of the inner packet are in the same scope zone as 1045 * the addresses of the icmp packet. But there is no other 1046 * way to determine the zone. 1047 */ 1048 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1049 1050 rcvif = m_get_rcvif(m, &s); 1051 if (__predict_false(rcvif == NULL)) 1052 goto freeit; 1053 sockaddr_in6_init(&icmp6dst, 1054 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1055 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1056 m_put_rcvif(rcvif, &s); 1057 goto freeit; 1058 } 1059 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1060 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1061 m_put_rcvif(rcvif, &s); 1062 goto freeit; 1063 } 1064 m_put_rcvif(rcvif, &s); 1065 1066 icmp6src.sin6_flowinfo = 1067 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1068 1069 if (finaldst == NULL) 1070 finaldst = &eip6->ip6_dst; 1071 ip6cp.ip6c_m = m; 1072 ip6cp.ip6c_icmp6 = icmp6; 1073 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1074 ip6cp.ip6c_off = eoff; 1075 ip6cp.ip6c_finaldst = finaldst; 1076 ip6cp.ip6c_src = &icmp6src; 1077 ip6cp.ip6c_nxt = nxt; 1078 1079 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1080 notifymtu = ntohl(icmp6->icmp6_mtu); 1081 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1082 } 1083 1084 ctlfunc = (void (*)(int, struct sockaddr *, void *)) 1085 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1086 if (ctlfunc) { 1087 (void)(*ctlfunc)(code, sin6tosa(&icmp6dst), &ip6cp); 1088 } 1089 } 1090 return (0); 1091 1092 freeit: 1093 m_freem(m); 1094 return (-1); 1095 } 1096 1097 void 1098 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1099 { 1100 unsigned long rtcount; 1101 struct icmp6_mtudisc_callback *mc; 1102 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1103 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1104 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1105 u_int mtu = ntohl(icmp6->icmp6_mtu); 1106 struct rtentry *rt = NULL; 1107 struct sockaddr_in6 sin6; 1108 struct ifnet *rcvif; 1109 int s; 1110 1111 /* 1112 * The MTU should not be less than the minimal IPv6 MTU except for the 1113 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1114 * In that one case, the MTU might be less than 1280. 1115 */ 1116 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1117 /* is the mtu even sane? */ 1118 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1119 return; 1120 if (!validated) 1121 return; 1122 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1123 } 1124 1125 /* 1126 * allow non-validated cases if memory is plenty, to make traffic 1127 * from non-connected pcb happy. 1128 */ 1129 mutex_enter(&icmp6_mtx); 1130 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1131 if (validated) { 1132 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) { 1133 mutex_exit(&icmp6_mtx); 1134 return; 1135 } else if (0 <= icmp6_mtudisc_lowat && 1136 rtcount > icmp6_mtudisc_lowat) { 1137 /* 1138 * XXX nuke a victim, install the new one. 1139 */ 1140 } 1141 } else { 1142 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) { 1143 mutex_exit(&icmp6_mtx); 1144 return; 1145 } 1146 } 1147 mutex_exit(&icmp6_mtx); 1148 1149 memset(&sin6, 0, sizeof(sin6)); 1150 sin6.sin6_family = PF_INET6; 1151 sin6.sin6_len = sizeof(struct sockaddr_in6); 1152 sin6.sin6_addr = *dst; 1153 rcvif = m_get_rcvif(m, &s); 1154 if (__predict_false(rcvif == NULL)) 1155 return; 1156 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1157 m_put_rcvif(rcvif, &s); 1158 return; 1159 } 1160 m_put_rcvif(rcvif, &s); 1161 1162 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1163 1164 if (rt && (rt->rt_flags & RTF_HOST) && 1165 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1166 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1167 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1168 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1169 rt->rt_rmx.rmx_mtu = mtu; 1170 } 1171 } 1172 if (rt) { 1173 rt_unref(rt); 1174 } 1175 1176 /* 1177 * Notify protocols that the MTU for this destination 1178 * has changed. 1179 */ 1180 mutex_enter(&icmp6_mtx); 1181 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1182 mc = LIST_NEXT(mc, mc_list)) 1183 (*mc->mc_func)(&sin6.sin6_addr); 1184 mutex_exit(&icmp6_mtx); 1185 } 1186 1187 /* 1188 * Process a Node Information Query packet, based on 1189 * draft-ietf-ipngwg-icmp-name-lookups-07. 1190 * 1191 * Spec incompatibilities: 1192 * - IPv6 Subject address handling 1193 * - IPv4 Subject address handling support missing 1194 * - Proxy reply (answer even if it's not for me) 1195 * - joins NI group address at in6_ifattach() time only, does not cope 1196 * with hostname changes by sethostname(3) 1197 */ 1198 static struct mbuf * 1199 ni6_input(struct mbuf *m, int off) 1200 { 1201 struct icmp6_nodeinfo *ni6, *nni6; 1202 struct mbuf *n = NULL; 1203 u_int16_t qtype; 1204 int subjlen; 1205 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1206 struct ni_reply_fqdn *fqdn; 1207 int addrs; /* for NI_QTYPE_NODEADDR */ 1208 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1209 struct sockaddr_in6 sin6; /* ip6_dst */ 1210 struct in6_addr in6_subj; /* subject address */ 1211 struct ip6_hdr *ip6; 1212 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1213 char *subj = NULL; 1214 struct ifnet *rcvif; 1215 int s, ss; 1216 struct ifaddr *ifa; 1217 struct psref psref; 1218 1219 ip6 = mtod(m, struct ip6_hdr *); 1220 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1221 if (ni6 == NULL) { 1222 /* m is already reclaimed */ 1223 return NULL; 1224 } 1225 KASSERT((m->m_flags & M_PKTHDR) != 0); 1226 1227 /* 1228 * Validate IPv6 destination address. 1229 * 1230 * The Responder must discard the Query without further processing 1231 * unless it is one of the Responder's unicast or anycast addresses, or 1232 * a link-local scope multicast address which the Responder has joined. 1233 * [icmp-name-lookups-07, Section 4.] 1234 */ 1235 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1236 /* XXX scopeid */ 1237 ss = pserialize_read_enter(); 1238 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1239 if (ifa != NULL) { 1240 ; /* unicast/anycast, fine */ 1241 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) { 1242 ; /* link-local multicast, fine */ 1243 } else { 1244 pserialize_read_exit(ss); 1245 goto bad; 1246 } 1247 pserialize_read_exit(ss); 1248 1249 /* validate query Subject field. */ 1250 qtype = ntohs(ni6->ni_qtype); 1251 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1252 switch (qtype) { 1253 case NI_QTYPE_NOOP: 1254 case NI_QTYPE_SUPTYPES: 1255 /* 07 draft */ 1256 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1257 break; 1258 /* FALLTHROUGH */ 1259 case NI_QTYPE_FQDN: 1260 case NI_QTYPE_NODEADDR: 1261 case NI_QTYPE_IPV4ADDR: 1262 switch (ni6->ni_code) { 1263 case ICMP6_NI_SUBJ_IPV6: 1264 #if ICMP6_NI_SUBJ_IPV6 != 0 1265 case 0: 1266 #endif 1267 /* 1268 * backward compatibility - try to accept 03 draft 1269 * format, where no Subject is present. 1270 */ 1271 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1272 subjlen == 0) { 1273 oldfqdn++; 1274 break; 1275 } 1276 #if ICMP6_NI_SUBJ_IPV6 != 0 1277 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1278 goto bad; 1279 #endif 1280 1281 if (subjlen != sizeof(sin6.sin6_addr)) 1282 goto bad; 1283 1284 /* 1285 * Validate Subject address. 1286 * 1287 * Not sure what exactly "address belongs to the node" 1288 * means in the spec, is it just unicast, or what? 1289 * 1290 * At this moment we consider Subject address as 1291 * "belong to the node" if the Subject address equals 1292 * to the IPv6 destination address; validation for 1293 * IPv6 destination address should have done enough 1294 * check for us. 1295 * 1296 * We do not do proxy at this moment. 1297 */ 1298 /* m_pulldown instead of copy? */ 1299 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1300 subjlen, (void *)&in6_subj); 1301 rcvif = m_get_rcvif(m, &s); 1302 if (__predict_false(rcvif == NULL)) 1303 goto bad; 1304 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1305 m_put_rcvif(rcvif, &s); 1306 goto bad; 1307 } 1308 m_put_rcvif(rcvif, &s); 1309 1310 subj = (char *)&in6_subj; 1311 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1312 break; 1313 1314 /* 1315 * XXX if we are to allow other cases, we should really 1316 * be careful about scope here. 1317 * basically, we should disallow queries toward IPv6 1318 * destination X with subject Y, if scope(X) > scope(Y). 1319 * if we allow scope(X) > scope(Y), it will result in 1320 * information leakage across scope boundary. 1321 */ 1322 goto bad; 1323 1324 case ICMP6_NI_SUBJ_FQDN: 1325 /* 1326 * Validate Subject name with gethostname(3). 1327 * 1328 * The behavior may need some debate, since: 1329 * - we are not sure if the node has FQDN as 1330 * hostname (returned by gethostname(3)). 1331 * - the code does wildcard match for truncated names. 1332 * however, we are not sure if we want to perform 1333 * wildcard match, if gethostname(3) side has 1334 * truncated hostname. 1335 */ 1336 n = ni6_nametodns(hostname, hostnamelen, 0); 1337 if (!n || n->m_next || n->m_len == 0) 1338 goto bad; 1339 IP6_EXTHDR_GET(subj, char *, m, 1340 off + sizeof(struct icmp6_nodeinfo), subjlen); 1341 if (subj == NULL) 1342 goto bad; 1343 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1344 n->m_len)) { 1345 goto bad; 1346 } 1347 m_freem(n); 1348 n = NULL; 1349 break; 1350 1351 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1352 default: 1353 goto bad; 1354 } 1355 break; 1356 } 1357 1358 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1359 switch (qtype) { 1360 case NI_QTYPE_FQDN: 1361 if ((icmp6_nodeinfo & 1) == 0) 1362 goto bad; 1363 break; 1364 case NI_QTYPE_NODEADDR: 1365 case NI_QTYPE_IPV4ADDR: 1366 if ((icmp6_nodeinfo & 2) == 0) 1367 goto bad; 1368 break; 1369 } 1370 1371 /* guess reply length */ 1372 switch (qtype) { 1373 case NI_QTYPE_NOOP: 1374 break; /* no reply data */ 1375 case NI_QTYPE_SUPTYPES: 1376 replylen += sizeof(u_int32_t); 1377 break; 1378 case NI_QTYPE_FQDN: 1379 /* will append an mbuf */ 1380 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1381 break; 1382 case NI_QTYPE_NODEADDR: 1383 addrs = ni6_addrs(ni6, &ifp, subj, &psref); 1384 replylen += addrs * 1385 (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1386 if (replylen > MCLBYTES) 1387 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1388 break; 1389 case NI_QTYPE_IPV4ADDR: 1390 /* unsupported - should respond with unknown Qtype? */ 1391 goto bad; 1392 default: 1393 /* 1394 * XXX: We must return a reply with the ICMP6 code 1395 * `unknown Qtype' in this case. However we regard the case 1396 * as an FQDN query for backward compatibility. 1397 * Older versions set a random value to this field, 1398 * so it rarely varies in the defined qtypes. 1399 * But the mechanism is not reliable... 1400 * maybe we should obsolete older versions. 1401 */ 1402 qtype = NI_QTYPE_FQDN; 1403 /* will append an mbuf */ 1404 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1405 oldfqdn++; 1406 break; 1407 } 1408 1409 /* allocate an mbuf to reply. */ 1410 MGETHDR(n, M_DONTWAIT, m->m_type); 1411 if (n == NULL) { 1412 goto bad; 1413 } 1414 M_MOVE_PKTHDR(n, m); /* just for rcvif */ 1415 if (replylen > MHLEN) { 1416 if (replylen > MCLBYTES) { 1417 /* 1418 * XXX: should we try to allocate more? But MCLBYTES 1419 * is probably much larger than IPV6_MMTU... 1420 */ 1421 goto bad; 1422 } 1423 MCLGET(n, M_DONTWAIT); 1424 if ((n->m_flags & M_EXT) == 0) { 1425 goto bad; 1426 } 1427 } 1428 n->m_pkthdr.len = n->m_len = replylen; 1429 1430 /* copy mbuf header and IPv6 + Node Information base headers */ 1431 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1432 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1433 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1434 1435 /* qtype dependent procedure */ 1436 switch (qtype) { 1437 case NI_QTYPE_NOOP: 1438 nni6->ni_code = ICMP6_NI_SUCCESS; 1439 nni6->ni_flags = 0; 1440 break; 1441 case NI_QTYPE_SUPTYPES: 1442 { 1443 u_int32_t v; 1444 nni6->ni_code = ICMP6_NI_SUCCESS; 1445 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1446 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1447 v = (u_int32_t)htonl(0x0000000f); 1448 memcpy(nni6 + 1, &v, sizeof(u_int32_t)); 1449 break; 1450 } 1451 case NI_QTYPE_FQDN: 1452 nni6->ni_code = ICMP6_NI_SUCCESS; 1453 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1454 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 1455 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1456 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1457 /* 1458 * XXX do we really have FQDN in variable "hostname"? 1459 */ 1460 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1461 if (n->m_next == NULL) 1462 goto bad; 1463 /* XXX we assume that n->m_next is not a chain */ 1464 if (n->m_next->m_next != NULL) 1465 goto bad; 1466 n->m_pkthdr.len += n->m_next->m_len; 1467 break; 1468 case NI_QTYPE_NODEADDR: 1469 { 1470 int lenlim, copied; 1471 1472 nni6->ni_code = ICMP6_NI_SUCCESS; 1473 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1474 sizeof(struct icmp6_nodeinfo); 1475 lenlim = M_TRAILINGSPACE(n); 1476 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1477 if_put(ifp, &psref); 1478 ifp = NULL; 1479 /* update mbuf length */ 1480 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1481 sizeof(struct icmp6_nodeinfo) + copied; 1482 break; 1483 } 1484 default: 1485 panic("%s: impossible", __func__); 1486 break; 1487 } 1488 1489 nni6->ni_type = ICMP6_NI_REPLY; 1490 m_freem(m); 1491 return n; 1492 1493 bad: 1494 if_put(ifp, &psref); 1495 m_freem(m); 1496 if (n) 1497 m_freem(n); 1498 return NULL; 1499 } 1500 1501 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1502 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1503 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1504 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1505 1506 /* 1507 * make a mbuf with DNS-encoded string. no compression support. 1508 * 1509 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1510 * treated as truncated name (two \0 at the end). this is a wild guess. 1511 * 1512 * old - return pascal string if non-zero 1513 */ 1514 static struct mbuf * 1515 ni6_nametodns(const char *name, int namelen, int old) 1516 { 1517 struct mbuf *m; 1518 char *cp, *ep; 1519 const char *p, *q; 1520 int i, len, nterm; 1521 1522 if (old) 1523 len = namelen + 1; 1524 else 1525 len = MCLBYTES; 1526 1527 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1528 MGET(m, M_DONTWAIT, MT_DATA); 1529 if (m && len > MLEN) { 1530 MCLGET(m, M_DONTWAIT); 1531 if ((m->m_flags & M_EXT) == 0) 1532 goto fail; 1533 } 1534 if (!m) 1535 goto fail; 1536 m->m_next = NULL; 1537 1538 if (old) { 1539 m->m_len = len; 1540 *mtod(m, char *) = namelen; 1541 memcpy(mtod(m, char *) + 1, name, namelen); 1542 return m; 1543 } else { 1544 m->m_len = 0; 1545 cp = mtod(m, char *); 1546 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1547 1548 /* if not certain about my name, return empty buffer */ 1549 if (namelen == 0) 1550 return m; 1551 1552 /* 1553 * guess if it looks like shortened hostname, or FQDN. 1554 * shortened hostname needs two trailing "\0". 1555 */ 1556 i = 0; 1557 for (p = name; p < name + namelen; p++) { 1558 if (*p == '.') 1559 i++; 1560 } 1561 if (i < 2) 1562 nterm = 2; 1563 else 1564 nterm = 1; 1565 1566 p = name; 1567 while (cp < ep && p < name + namelen) { 1568 i = 0; 1569 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1570 i++; 1571 /* result does not fit into mbuf */ 1572 if (cp + i + 1 >= ep) 1573 goto fail; 1574 /* 1575 * DNS label length restriction, RFC1035 page 8. 1576 * "i == 0" case is included here to avoid returning 1577 * 0-length label on "foo..bar". 1578 */ 1579 if (i <= 0 || i >= 64) 1580 goto fail; 1581 *cp++ = i; 1582 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1583 goto fail; 1584 while (i > 0) { 1585 if (!isalnum(*p) && *p != '-') 1586 goto fail; 1587 if (isupper(*p)) { 1588 *cp++ = tolower(*p); 1589 p++; 1590 } else 1591 *cp++ = *p++; 1592 i--; 1593 } 1594 p = q; 1595 if (p < name + namelen && *p == '.') 1596 p++; 1597 } 1598 /* termination */ 1599 if (cp + nterm >= ep) 1600 goto fail; 1601 while (nterm-- > 0) 1602 *cp++ = '\0'; 1603 m->m_len = cp - mtod(m, char *); 1604 return m; 1605 } 1606 1607 panic("should not reach here"); 1608 /* NOTREACHED */ 1609 1610 fail: 1611 if (m) 1612 m_freem(m); 1613 return NULL; 1614 } 1615 1616 /* 1617 * check if two DNS-encoded string matches. takes care of truncated 1618 * form (with \0\0 at the end). no compression support. 1619 * XXX upper/lowercase match (see RFC2065) 1620 */ 1621 static int 1622 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1623 { 1624 const char *a0, *b0; 1625 int l; 1626 1627 /* simplest case - need validation? */ 1628 if (alen == blen && memcmp(a, b, alen) == 0) 1629 return 1; 1630 1631 a0 = a; 1632 b0 = b; 1633 1634 /* termination is mandatory */ 1635 if (alen < 2 || blen < 2) 1636 return 0; 1637 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1638 return 0; 1639 alen--; 1640 blen--; 1641 1642 while (a - a0 < alen && b - b0 < blen) { 1643 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1644 return 0; 1645 1646 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1647 return 0; 1648 /* we don't support compression yet */ 1649 if (a[0] >= 64 || b[0] >= 64) 1650 return 0; 1651 1652 /* truncated case */ 1653 if (a[0] == 0 && a - a0 == alen - 1) 1654 return 1; 1655 if (b[0] == 0 && b - b0 == blen - 1) 1656 return 1; 1657 if (a[0] == 0 || b[0] == 0) 1658 return 0; 1659 1660 if (a[0] != b[0]) 1661 return 0; 1662 l = a[0]; 1663 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1664 return 0; 1665 if (memcmp(a + 1, b + 1, l) != 0) 1666 return 0; 1667 1668 a += 1 + l; 1669 b += 1 + l; 1670 } 1671 1672 if (a - a0 == alen && b - b0 == blen) 1673 return 1; 1674 else 1675 return 0; 1676 } 1677 1678 /* 1679 * calculate the number of addresses to be returned in the node info reply. 1680 */ 1681 static int 1682 ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj, 1683 struct psref *psref) 1684 { 1685 struct ifnet *ifp; 1686 struct in6_ifaddr *ia6; 1687 struct ifaddr *ifa; 1688 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1689 int addrs = 0, addrsofif, iffound = 0; 1690 int niflags = ni6->ni_flags; 1691 int s; 1692 1693 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1694 switch (ni6->ni_code) { 1695 case ICMP6_NI_SUBJ_IPV6: 1696 if (subj == NULL) /* must be impossible... */ 1697 return 0; 1698 subj_ip6 = (struct sockaddr_in6 *)subj; 1699 break; 1700 default: 1701 /* 1702 * XXX: we only support IPv6 subject address for 1703 * this Qtype. 1704 */ 1705 return 0; 1706 } 1707 } 1708 1709 s = pserialize_read_enter(); 1710 IFNET_READER_FOREACH(ifp) { 1711 addrsofif = 0; 1712 IFADDR_READER_FOREACH(ifa, ifp) { 1713 if (ifa->ifa_addr->sa_family != AF_INET6) 1714 continue; 1715 ia6 = (struct in6_ifaddr *)ifa; 1716 1717 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1718 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1719 &ia6->ia_addr.sin6_addr)) 1720 iffound = 1; 1721 1722 /* 1723 * IPv4-mapped addresses can only be returned by a 1724 * Node Information proxy, since they represent 1725 * addresses of IPv4-only nodes, which perforce do 1726 * not implement this protocol. 1727 * [icmp-name-lookups-07, Section 5.4] 1728 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1729 * this function at this moment. 1730 */ 1731 1732 /* What do we have to do about ::1? */ 1733 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1734 case IPV6_ADDR_SCOPE_LINKLOCAL: 1735 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1736 continue; 1737 break; 1738 case IPV6_ADDR_SCOPE_SITELOCAL: 1739 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1740 continue; 1741 break; 1742 case IPV6_ADDR_SCOPE_GLOBAL: 1743 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1744 continue; 1745 break; 1746 default: 1747 continue; 1748 } 1749 1750 /* 1751 * check if anycast is okay. 1752 * XXX: just experimental. not in the spec. 1753 */ 1754 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1755 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1756 continue; /* we need only unicast addresses */ 1757 1758 addrsofif++; /* count the address */ 1759 } 1760 if (iffound) { 1761 if_acquire(ifp, psref); 1762 pserialize_read_exit(s); 1763 *ifpp = ifp; 1764 return addrsofif; 1765 } 1766 1767 addrs += addrsofif; 1768 } 1769 pserialize_read_exit(s); 1770 1771 return addrs; 1772 } 1773 1774 static int 1775 ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1776 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1777 int resid) 1778 { 1779 struct ifnet *ifp; 1780 struct in6_ifaddr *ia6; 1781 struct ifaddr *ifa; 1782 struct ifnet *ifp_dep = NULL; 1783 int copied = 0, allow_deprecated = 0; 1784 u_char *cp = (u_char *)(nni6 + 1); 1785 int niflags = ni6->ni_flags; 1786 u_int32_t ltime; 1787 int s; 1788 1789 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1790 return 0; /* needless to copy */ 1791 1792 s = pserialize_read_enter(); 1793 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1794 again: 1795 1796 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1797 { 1798 IFADDR_READER_FOREACH(ifa, ifp) { 1799 if (ifa->ifa_addr->sa_family != AF_INET6) 1800 continue; 1801 ia6 = (struct in6_ifaddr *)ifa; 1802 1803 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1804 allow_deprecated == 0) { 1805 /* 1806 * prefererred address should be put before 1807 * deprecated addresses. 1808 */ 1809 1810 /* record the interface for later search */ 1811 if (ifp_dep == NULL) 1812 ifp_dep = ifp; 1813 1814 continue; 1815 } 1816 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1817 allow_deprecated != 0) 1818 continue; /* we now collect deprecated addrs */ 1819 1820 /* What do we have to do about ::1? */ 1821 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1822 case IPV6_ADDR_SCOPE_LINKLOCAL: 1823 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1824 continue; 1825 break; 1826 case IPV6_ADDR_SCOPE_SITELOCAL: 1827 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1828 continue; 1829 break; 1830 case IPV6_ADDR_SCOPE_GLOBAL: 1831 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1832 continue; 1833 break; 1834 default: 1835 continue; 1836 } 1837 1838 /* 1839 * check if anycast is okay. 1840 * XXX: just experimental. not in the spec. 1841 */ 1842 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1843 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1844 continue; 1845 1846 /* now we can copy the address */ 1847 if (resid < sizeof(struct in6_addr) + 1848 sizeof(u_int32_t)) { 1849 /* 1850 * We give up much more copy. 1851 * Set the truncate flag and return. 1852 */ 1853 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1854 goto out; 1855 } 1856 1857 /* 1858 * Set the TTL of the address. 1859 * The TTL value should be one of the following 1860 * according to the specification: 1861 * 1862 * 1. The remaining lifetime of a DHCP lease on the 1863 * address, or 1864 * 2. The remaining Valid Lifetime of a prefix from 1865 * which the address was derived through Stateless 1866 * Autoconfiguration. 1867 * 1868 * Note that we currently do not support stateful 1869 * address configuration by DHCPv6, so the former 1870 * case can't happen. 1871 * 1872 * TTL must be 2^31 > TTL >= 0. 1873 */ 1874 if (ia6->ia6_lifetime.ia6t_expire == 0) 1875 ltime = ND6_INFINITE_LIFETIME; 1876 else { 1877 if (ia6->ia6_lifetime.ia6t_expire > 1878 time_uptime) 1879 ltime = ia6->ia6_lifetime.ia6t_expire - 1880 time_uptime; 1881 else 1882 ltime = 0; 1883 } 1884 if (ltime > 0x7fffffff) 1885 ltime = 0x7fffffff; 1886 ltime = htonl(ltime); 1887 1888 memcpy(cp, <ime, sizeof(u_int32_t)); 1889 cp += sizeof(u_int32_t); 1890 1891 /* copy the address itself */ 1892 bcopy(&ia6->ia_addr.sin6_addr, cp, 1893 sizeof(struct in6_addr)); 1894 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1895 cp += sizeof(struct in6_addr); 1896 1897 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1898 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1899 } 1900 if (ifp0) /* we need search only on the specified IF */ 1901 break; 1902 } 1903 1904 if (allow_deprecated == 0 && ifp_dep != NULL) { 1905 ifp = ifp_dep; 1906 allow_deprecated = 1; 1907 1908 goto again; 1909 } 1910 out: 1911 pserialize_read_exit(s); 1912 return copied; 1913 } 1914 1915 /* 1916 * XXX almost dup'ed code with rip6_input. 1917 */ 1918 static int 1919 icmp6_rip6_input(struct mbuf **mp, int off) 1920 { 1921 struct mbuf *m = *mp; 1922 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1923 struct inpcb_hdr *inph; 1924 struct in6pcb *in6p; 1925 struct in6pcb *last = NULL; 1926 struct sockaddr_in6 rip6src; 1927 struct icmp6_hdr *icmp6; 1928 struct mbuf *n, *opts = NULL; 1929 1930 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1931 if (icmp6 == NULL) { 1932 /* m is already reclaimed */ 1933 return IPPROTO_DONE; 1934 } 1935 1936 /* 1937 * XXX: the address may have embedded scope zone ID, which should be 1938 * hidden from applications. 1939 */ 1940 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1941 if (sa6_recoverscope(&rip6src)) { 1942 m_freem(m); 1943 return IPPROTO_DONE; 1944 } 1945 1946 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1947 in6p = (struct in6pcb *)inph; 1948 if (in6p->in6p_af != AF_INET6) 1949 continue; 1950 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1951 continue; 1952 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1953 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1954 continue; 1955 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1956 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1957 continue; 1958 if (in6p->in6p_icmp6filt && 1959 ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1960 in6p->in6p_icmp6filt)) 1961 continue; 1962 1963 if (last == NULL) { 1964 ; 1965 } 1966 #ifdef IPSEC 1967 else if (ipsec_used && ipsec_in_reject(m, last)) { 1968 /* do not inject data into pcb */ 1969 } 1970 #endif 1971 else if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1972 if (last->in6p_flags & IN6P_CONTROLOPTS) 1973 ip6_savecontrol(last, &opts, ip6, n); 1974 /* strip intermediate headers */ 1975 m_adj(n, off); 1976 if (sbappendaddr(&last->in6p_socket->so_rcv, 1977 sin6tosa(&rip6src), n, opts) == 0) { 1978 soroverflow(last->in6p_socket); 1979 m_freem(n); 1980 if (opts) 1981 m_freem(opts); 1982 } else { 1983 sorwakeup(last->in6p_socket); 1984 } 1985 opts = NULL; 1986 } 1987 1988 last = in6p; 1989 } 1990 1991 #ifdef IPSEC 1992 if (ipsec_used && last && ipsec_in_reject(m, last)) { 1993 m_freem(m); 1994 IP6_STATDEC(IP6_STAT_DELIVERED); 1995 /* do not inject data into pcb */ 1996 } else 1997 #endif 1998 if (last) { 1999 if (last->in6p_flags & IN6P_CONTROLOPTS) 2000 ip6_savecontrol(last, &opts, ip6, m); 2001 /* strip intermediate headers */ 2002 m_adj(m, off); 2003 if (sbappendaddr(&last->in6p_socket->so_rcv, 2004 sin6tosa(&rip6src), m, opts) == 0) { 2005 soroverflow(last->in6p_socket); 2006 m_freem(m); 2007 if (opts) 2008 m_freem(opts); 2009 } else { 2010 sorwakeup(last->in6p_socket); 2011 } 2012 } else { 2013 m_freem(m); 2014 IP6_STATDEC(IP6_STAT_DELIVERED); 2015 } 2016 return IPPROTO_DONE; 2017 } 2018 2019 /* 2020 * Reflect the ip6 packet back to the source. 2021 * OFF points to the icmp6 header, counted from the top of the mbuf. 2022 * 2023 * Note: RFC 1885 required that an echo reply should be truncated if it 2024 * did not fit in with (return) path MTU, and KAME code supported the 2025 * behavior. However, as a clarification after the RFC, this limitation 2026 * was removed in a revised version of the spec, RFC 2463. We had kept the 2027 * old behavior, with a (non-default) ifdef block, while the new version of 2028 * the spec was an internet-draft status, and even after the new RFC was 2029 * published. But it would rather make sense to clean the obsoleted part 2030 * up, and to make the code simpler at this stage. 2031 */ 2032 static void 2033 icmp6_reflect(struct mbuf *m, size_t off) 2034 { 2035 struct ip6_hdr *ip6; 2036 struct icmp6_hdr *icmp6; 2037 const struct in6_ifaddr *ia; 2038 const struct ip6aux *ip6a; 2039 int plen; 2040 int type, code; 2041 struct ifnet *outif = NULL; 2042 struct in6_addr origdst; 2043 struct ifnet *rcvif; 2044 int s; 2045 bool ip6_src_filled = false; 2046 2047 /* too short to reflect */ 2048 if (off < sizeof(struct ip6_hdr)) { 2049 nd6log(LOG_DEBUG, 2050 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2051 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2052 __FILE__, __LINE__); 2053 goto bad; 2054 } 2055 2056 /* 2057 * If there are extra headers between IPv6 and ICMPv6, strip 2058 * off that header first. 2059 */ 2060 CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN); 2061 if (off > sizeof(struct ip6_hdr)) { 2062 size_t l; 2063 struct ip6_hdr nip6; 2064 2065 l = off - sizeof(struct ip6_hdr); 2066 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2067 m_adj(m, l); 2068 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2069 if (m->m_len < l) { 2070 if ((m = m_pullup(m, l)) == NULL) 2071 return; 2072 } 2073 memcpy(mtod(m, void *), (void *)&nip6, sizeof(nip6)); 2074 } else { 2075 size_t l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2076 if (m->m_len < l) { 2077 if ((m = m_pullup(m, l)) == NULL) 2078 return; 2079 } 2080 } 2081 2082 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2083 ip6 = mtod(m, struct ip6_hdr *); 2084 ip6->ip6_nxt = IPPROTO_ICMPV6; 2085 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2086 type = icmp6->icmp6_type; /* keep type for statistics */ 2087 code = icmp6->icmp6_code; /* ditto. */ 2088 2089 origdst = ip6->ip6_dst; 2090 /* 2091 * ip6_input() drops a packet if its src is multicast. 2092 * So, the src is never multicast. 2093 */ 2094 ip6->ip6_dst = ip6->ip6_src; 2095 2096 /* 2097 * If the incoming packet was addressed directly to us (i.e. unicast), 2098 * use dst as the src for the reply. 2099 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2100 * (for example) when we encounter an error while forwarding procedure 2101 * destined to a duplicated address of ours. 2102 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2103 * procedure of an outgoing packet of our own, in which case we need 2104 * to search in the ifaddr list. 2105 */ 2106 if (IN6_IS_ADDR_MULTICAST(&origdst)) { 2107 ; 2108 } else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2109 if ((ip6a->ip6a_flags & 2110 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2111 ip6->ip6_src = ip6a->ip6a_src; 2112 ip6_src_filled = true; 2113 } 2114 } else { 2115 union { 2116 struct sockaddr_in6 sin6; 2117 struct sockaddr sa; 2118 } u; 2119 int _s; 2120 struct ifaddr *ifa; 2121 2122 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2123 2124 _s = pserialize_read_enter(); 2125 ifa = ifa_ifwithaddr(&u.sa); 2126 2127 if (ifa != NULL) { 2128 ia = ifatoia6(ifa); 2129 if ((ia->ia6_flags & 2130 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2131 ip6->ip6_src = ia->ia_addr.sin6_addr; 2132 ip6_src_filled = true; 2133 } 2134 } 2135 pserialize_read_exit(_s); 2136 } 2137 2138 if (!ip6_src_filled) { 2139 int e; 2140 struct sockaddr_in6 sin6; 2141 struct route ro; 2142 2143 /* 2144 * This case matches to multicasts, our anycast, or unicasts 2145 * that we do not own. Select a source address based on the 2146 * source address of the erroneous packet. 2147 */ 2148 /* zone ID should be embedded */ 2149 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2150 2151 memset(&ro, 0, sizeof(ro)); 2152 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2153 &ip6->ip6_src); 2154 rtcache_free(&ro); 2155 if (e != 0) { 2156 char ip6buf[INET6_ADDRSTRLEN]; 2157 nd6log(LOG_DEBUG, 2158 "source can't be determined: " 2159 "dst=%s, error=%d\n", 2160 IN6_PRINT(ip6buf, &sin6.sin6_addr), e); 2161 goto bad; 2162 } 2163 } 2164 2165 ip6->ip6_flow = 0; 2166 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2167 ip6->ip6_vfc |= IPV6_VERSION; 2168 ip6->ip6_nxt = IPPROTO_ICMPV6; 2169 rcvif = m_get_rcvif(m, &s); 2170 if (rcvif) { 2171 /* XXX: This may not be the outgoing interface */ 2172 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2173 } else { 2174 ip6->ip6_hlim = ip6_defhlim; 2175 } 2176 m_put_rcvif(rcvif, &s); 2177 2178 m->m_pkthdr.csum_flags = 0; 2179 icmp6->icmp6_cksum = 0; 2180 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2181 sizeof(struct ip6_hdr), plen); 2182 2183 /* 2184 * XXX option handling 2185 */ 2186 2187 m->m_flags &= ~(M_BCAST|M_MCAST); 2188 2189 /* 2190 * To avoid a "too big" situation at an intermediate router 2191 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2192 * Note that only echo and node information replies are affected, 2193 * since the length of ICMP6 errors is limited to the minimum MTU. 2194 */ 2195 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) != 0 && 2196 outif) 2197 icmp6_ifstat_inc(outif, ifs6_out_error); 2198 if (outif) 2199 icmp6_ifoutstat_inc(outif, type, code); 2200 2201 return; 2202 2203 bad: 2204 m_freem(m); 2205 return; 2206 } 2207 2208 static const char * 2209 icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6, 2210 struct in6_addr *dst6, struct in6_addr *tgt6) 2211 { 2212 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 2213 char ip6buft[INET6_ADDRSTRLEN]; 2214 2215 snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)", 2216 IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6), 2217 IN6_PRINT(ip6buft, tgt6)); 2218 return buf; 2219 } 2220 2221 static void 2222 icmp6_redirect_input(struct mbuf *m, int off) 2223 { 2224 struct ifnet *ifp; 2225 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2226 struct nd_redirect *nd_rd; 2227 int icmp6len = m->m_pkthdr.len - off; 2228 char *lladdr = NULL; 2229 int lladdrlen = 0; 2230 struct rtentry *rt = NULL; 2231 int is_router; 2232 int is_onlink; 2233 struct in6_addr src6 = ip6->ip6_src; 2234 struct in6_addr redtgt6; 2235 struct in6_addr reddst6; 2236 union nd_opts ndopts; 2237 struct psref psref; 2238 char ip6buf[INET6_ADDRSTRLEN]; 2239 char diagbuf[256]; 2240 2241 ifp = m_get_rcvif_psref(m, &psref); 2242 if (ifp == NULL) 2243 goto freeit; 2244 2245 /* XXX if we are router, we don't update route by icmp6 redirect */ 2246 if (ip6_forwarding) 2247 goto freeit; 2248 if (!icmp6_rediraccept) 2249 goto freeit; 2250 2251 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2252 if (nd_rd == NULL) { 2253 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2254 m_put_rcvif_psref(ifp, &psref); 2255 return; 2256 } 2257 redtgt6 = nd_rd->nd_rd_target; 2258 reddst6 = nd_rd->nd_rd_dst; 2259 2260 if (in6_setscope(&redtgt6, ifp, NULL) || 2261 in6_setscope(&reddst6, ifp, NULL)) { 2262 goto freeit; 2263 } 2264 2265 /* validation */ 2266 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2267 nd6log(LOG_ERR, 2268 "ICMP6 redirect sent from %s rejected; " 2269 "must be from linklocal\n", IN6_PRINT(ip6buf, &src6)); 2270 goto bad; 2271 } 2272 if (ip6->ip6_hlim != 255) { 2273 nd6log(LOG_ERR, 2274 "ICMP6 redirect sent from %s rejected; " 2275 "hlim=%d (must be 255)\n", 2276 IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim); 2277 goto bad; 2278 } 2279 2280 { 2281 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2282 struct sockaddr_in6 sin6; 2283 struct in6_addr *gw6; 2284 2285 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2286 rt = rtalloc1(sin6tosa(&sin6), 0); 2287 if (rt) { 2288 if (rt->rt_gateway == NULL || 2289 rt->rt_gateway->sa_family != AF_INET6) { 2290 nd6log(LOG_ERR, 2291 "ICMP6 redirect rejected; no route " 2292 "with inet6 gateway found for redirect dst: %s\n", 2293 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2294 &src6, &reddst6, &redtgt6)); 2295 rt_unref(rt); 2296 goto bad; 2297 } 2298 2299 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2300 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2301 nd6log(LOG_ERR, 2302 "ICMP6 redirect rejected; " 2303 "not equal to gw-for-src=%s (must be same): %s\n", 2304 IN6_PRINT(ip6buf, gw6), 2305 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2306 &src6, &reddst6, &redtgt6)); 2307 rt_unref(rt); 2308 goto bad; 2309 } 2310 } else { 2311 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2312 "no route found for redirect dst: %s\n", 2313 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2314 &src6, &reddst6, &redtgt6)); 2315 goto bad; 2316 } 2317 rt_unref(rt); 2318 rt = NULL; 2319 } 2320 2321 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2322 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2323 "redirect dst must be unicast: %s\n", 2324 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2325 &src6, &reddst6, &redtgt6)); 2326 goto bad; 2327 } 2328 2329 is_router = is_onlink = 0; 2330 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2331 is_router = 1; /* router case */ 2332 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2333 is_onlink = 1; /* on-link destination case */ 2334 if (!is_router && !is_onlink) { 2335 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2336 "neither router case nor onlink case: %s\n", 2337 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2338 &src6, &reddst6, &redtgt6)); 2339 goto bad; 2340 } 2341 /* validation passed */ 2342 2343 icmp6len -= sizeof(*nd_rd); 2344 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2345 if (nd6_options(&ndopts) < 0) { 2346 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2347 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2348 &src6, &reddst6, &redtgt6)); 2349 /* nd6_options have incremented stats */ 2350 goto freeit; 2351 } 2352 2353 if (ndopts.nd_opts_tgt_lladdr) { 2354 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2355 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2356 } 2357 2358 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2359 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2360 "(if %d, icmp6 packet %d): %s\n", 2361 IN6_PRINT(ip6buf, &redtgt6), 2362 ifp->if_addrlen, lladdrlen - 2, 2363 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2364 &src6, &reddst6, &redtgt6)); 2365 goto bad; 2366 } 2367 2368 /* RFC 2461 8.3 */ 2369 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2370 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2371 2372 m_put_rcvif_psref(ifp, &psref); 2373 ifp = NULL; 2374 2375 if (!is_onlink) { /* better router case. perform rtredirect. */ 2376 /* perform rtredirect */ 2377 struct sockaddr_in6 sdst; 2378 struct sockaddr_in6 sgw; 2379 struct sockaddr_in6 ssrc; 2380 unsigned long rtcount; 2381 struct rtentry *newrt = NULL; 2382 2383 /* 2384 * do not install redirect route, if the number of entries 2385 * is too much (> hiwat). note that, the node (= host) will 2386 * work just fine even if we do not install redirect route 2387 * (there will be additional hops, though). 2388 */ 2389 mutex_enter(&icmp6_mtx); 2390 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2391 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) { 2392 mutex_exit(&icmp6_mtx); 2393 goto freeit; 2394 } 2395 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) { 2396 mutex_exit(&icmp6_mtx); 2397 goto freeit; 2398 } else if (0 <= icmp6_redirect_lowat && 2399 rtcount > icmp6_redirect_lowat) { 2400 /* 2401 * XXX nuke a victim, install the new one. 2402 */ 2403 } 2404 2405 memset(&sdst, 0, sizeof(sdst)); 2406 memset(&sgw, 0, sizeof(sgw)); 2407 memset(&ssrc, 0, sizeof(ssrc)); 2408 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2409 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2410 sizeof(struct sockaddr_in6); 2411 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2412 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2413 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2414 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2415 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), &newrt); 2416 2417 if (newrt) { 2418 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2419 icmp6_redirect_timeout_q); 2420 rt_unref(newrt); 2421 } 2422 mutex_exit(&icmp6_mtx); 2423 } 2424 /* finally update cached route in each socket via pfctlinput */ 2425 { 2426 struct sockaddr_in6 sdst; 2427 2428 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2429 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2430 #if defined(IPSEC) 2431 if (ipsec_used) 2432 key_sa_routechange(sin6tosa(&sdst)); 2433 #endif 2434 } 2435 2436 freeit: 2437 if (ifp != NULL) 2438 m_put_rcvif_psref(ifp, &psref); 2439 m_freem(m); 2440 return; 2441 2442 bad: 2443 m_put_rcvif_psref(ifp, &psref); 2444 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2445 m_freem(m); 2446 } 2447 2448 void 2449 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2450 { 2451 struct ifnet *ifp; /* my outgoing interface */ 2452 struct in6_addr *ifp_ll6; 2453 struct in6_addr *nexthop; 2454 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2455 struct mbuf *m = NULL; /* newly allocated one */ 2456 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2457 struct nd_redirect *nd_rd; 2458 size_t maxlen; 2459 u_char *p; 2460 struct sockaddr_in6 src_sa; 2461 2462 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2463 2464 /* if we are not router, we don't send icmp6 redirect */ 2465 if (!ip6_forwarding) 2466 goto fail; 2467 2468 /* sanity check */ 2469 KASSERT(m0 != NULL); 2470 KASSERT(rt != NULL); 2471 2472 ifp = rt->rt_ifp; 2473 2474 /* 2475 * Address check: 2476 * the source address must identify a neighbor, and 2477 * the destination address must not be a multicast address 2478 * [RFC 2461, sec 8.2] 2479 */ 2480 sip6 = mtod(m0, struct ip6_hdr *); 2481 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2482 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2483 goto fail; 2484 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2485 goto fail; /* what should we do here? */ 2486 2487 /* rate limit */ 2488 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2489 goto fail; 2490 2491 /* 2492 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2493 * we almost always ask for an mbuf cluster for simplicity. 2494 * (MHLEN < IPV6_MMTU is almost always true) 2495 */ 2496 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2497 if (m && IPV6_MMTU >= MHLEN) { 2498 #if IPV6_MMTU >= MCLBYTES 2499 _MCLGET(m, mcl_cache, IPV6_MMTU, M_DONTWAIT); 2500 #else 2501 MCLGET(m, M_DONTWAIT); 2502 #endif 2503 } 2504 2505 if (!m) 2506 goto fail; 2507 m_reset_rcvif(m); 2508 m->m_len = 0; 2509 maxlen = M_TRAILINGSPACE(m); 2510 maxlen = min(IPV6_MMTU, maxlen); 2511 2512 /* just for safety */ 2513 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct nd_redirect) + 2514 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2515 goto fail; 2516 } 2517 2518 { 2519 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2520 struct in6_ifaddr *ia; 2521 int s = pserialize_read_enter(); 2522 if ((ia = in6ifa_ifpforlinklocal(ifp, 2523 IN6_IFF_NOTREADY| 2524 IN6_IFF_ANYCAST)) == NULL) { 2525 pserialize_read_exit(s); 2526 goto fail; 2527 } 2528 ifp_ll6 = &ia->ia_addr.sin6_addr; 2529 pserialize_read_exit(s); 2530 } 2531 2532 /* get ip6 linklocal address for the router. */ 2533 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2534 struct sockaddr_in6 *sin6; 2535 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2536 nexthop = &sin6->sin6_addr; 2537 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2538 nexthop = NULL; 2539 } else 2540 nexthop = NULL; 2541 2542 /* ip6 */ 2543 ip6 = mtod(m, struct ip6_hdr *); 2544 ip6->ip6_flow = 0; 2545 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2546 ip6->ip6_vfc |= IPV6_VERSION; 2547 /* ip6->ip6_plen will be set later */ 2548 ip6->ip6_nxt = IPPROTO_ICMPV6; 2549 ip6->ip6_hlim = 255; 2550 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2551 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2552 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2553 2554 /* ND Redirect */ 2555 nd_rd = (struct nd_redirect *)(ip6 + 1); 2556 nd_rd->nd_rd_type = ND_REDIRECT; 2557 nd_rd->nd_rd_code = 0; 2558 nd_rd->nd_rd_reserved = 0; 2559 if (rt->rt_flags & RTF_GATEWAY) { 2560 /* 2561 * nd_rd->nd_rd_target must be a link-local address in 2562 * better router cases. 2563 */ 2564 if (!nexthop) 2565 goto fail; 2566 bcopy(nexthop, &nd_rd->nd_rd_target, 2567 sizeof(nd_rd->nd_rd_target)); 2568 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2569 sizeof(nd_rd->nd_rd_dst)); 2570 } else { 2571 /* make sure redtgt == reddst */ 2572 nexthop = &sip6->ip6_dst; 2573 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2574 sizeof(nd_rd->nd_rd_target)); 2575 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2576 sizeof(nd_rd->nd_rd_dst)); 2577 } 2578 2579 p = (u_char *)(nd_rd + 1); 2580 2581 { 2582 /* target lladdr option */ 2583 struct llentry *ln = NULL; 2584 int len, pad; 2585 struct nd_opt_hdr *nd_opt; 2586 char *lladdr; 2587 2588 ln = nd6_lookup(nexthop, ifp, false); 2589 if (ln == NULL) 2590 goto nolladdropt; 2591 len = sizeof(*nd_opt) + ifp->if_addrlen; 2592 len = (len + 7) & ~7; /* round by 8 */ 2593 pad = len - (sizeof(*nd_opt) + ifp->if_addrlen); 2594 2595 /* safety check */ 2596 if (len + (p - (u_char *)ip6) > maxlen) { 2597 LLE_RUNLOCK(ln); 2598 goto nolladdropt; 2599 } 2600 2601 if (ln->la_flags & LLE_VALID) { 2602 nd_opt = (struct nd_opt_hdr *)p; 2603 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2604 nd_opt->nd_opt_len = len >> 3; 2605 lladdr = (char *)(nd_opt + 1); 2606 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2607 memset(lladdr + ifp->if_addrlen, 0, pad); 2608 p += len; 2609 } 2610 LLE_RUNLOCK(ln); 2611 } 2612 nolladdropt: 2613 2614 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2615 2616 /* just to be safe */ 2617 if (m0->m_flags & M_DECRYPTED) 2618 goto noredhdropt; 2619 if (p - (u_char *)ip6 > maxlen) 2620 goto noredhdropt; 2621 2622 { 2623 /* redirected header option */ 2624 int len; 2625 struct nd_opt_rd_hdr *nd_opt_rh; 2626 2627 /* 2628 * compute the maximum size for icmp6 redirect header option. 2629 * XXX room for auth header? 2630 */ 2631 len = maxlen - (p - (u_char *)ip6); 2632 len &= ~7; 2633 2634 if (len < sizeof(*nd_opt_rh)) { 2635 goto noredhdropt; 2636 } 2637 2638 /* 2639 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2640 * about padding/truncate rule for the original IP packet. 2641 * From the discussion on IPv6imp in Feb 1999, 2642 * the consensus was: 2643 * - "attach as much as possible" is the goal 2644 * - pad if not aligned (original size can be guessed by 2645 * original ip6 header) 2646 * Following code adds the padding if it is simple enough, 2647 * and truncates if not. 2648 */ 2649 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2650 /* not enough room, truncate */ 2651 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2652 m0->m_pkthdr.len); 2653 } else { 2654 /* 2655 * enough room, truncate if not aligned. 2656 * we don't pad here for simplicity. 2657 */ 2658 int extra; 2659 2660 extra = m0->m_pkthdr.len % 8; 2661 if (extra) { 2662 /* truncate */ 2663 m_adj(m0, -extra); 2664 } 2665 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2666 } 2667 2668 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2669 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2670 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2671 nd_opt_rh->nd_opt_rh_len = len >> 3; 2672 p += sizeof(*nd_opt_rh); 2673 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2674 2675 /* connect m0 to m */ 2676 m->m_pkthdr.len += m0->m_pkthdr.len; 2677 m_cat(m, m0); 2678 m0 = NULL; 2679 } 2680 noredhdropt: 2681 if (m0) { 2682 m_freem(m0); 2683 m0 = NULL; 2684 } 2685 2686 /* XXX: clear embedded link IDs in the inner header */ 2687 in6_clearscope(&sip6->ip6_src); 2688 in6_clearscope(&sip6->ip6_dst); 2689 in6_clearscope(&nd_rd->nd_rd_target); 2690 in6_clearscope(&nd_rd->nd_rd_dst); 2691 2692 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2693 2694 nd_rd->nd_rd_cksum = 0; 2695 nd_rd->nd_rd_cksum = 2696 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2697 2698 /* send the packet to outside... */ 2699 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2700 icmp6_ifstat_inc(ifp, ifs6_out_error); 2701 2702 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2703 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2704 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2705 2706 return; 2707 2708 fail: 2709 if (m) 2710 m_freem(m); 2711 if (m0) 2712 m_freem(m0); 2713 } 2714 2715 /* 2716 * ICMPv6 socket option processing. 2717 */ 2718 int 2719 icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2720 { 2721 int error = 0; 2722 struct in6pcb *in6p = sotoin6pcb(so); 2723 2724 if (sopt->sopt_level != IPPROTO_ICMPV6) 2725 return rip6_ctloutput(op, so, sopt); 2726 2727 switch (op) { 2728 case PRCO_SETOPT: 2729 switch (sopt->sopt_name) { 2730 case ICMP6_FILTER: 2731 { 2732 struct icmp6_filter fil; 2733 2734 error = sockopt_get(sopt, &fil, sizeof(fil)); 2735 if (error) 2736 break; 2737 memcpy(in6p->in6p_icmp6filt, &fil, 2738 sizeof(struct icmp6_filter)); 2739 error = 0; 2740 break; 2741 } 2742 2743 default: 2744 error = ENOPROTOOPT; 2745 break; 2746 } 2747 break; 2748 2749 case PRCO_GETOPT: 2750 switch (sopt->sopt_name) { 2751 case ICMP6_FILTER: 2752 { 2753 if (in6p->in6p_icmp6filt == NULL) { 2754 error = EINVAL; 2755 break; 2756 } 2757 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2758 sizeof(struct icmp6_filter)); 2759 break; 2760 } 2761 2762 default: 2763 error = ENOPROTOOPT; 2764 break; 2765 } 2766 break; 2767 } 2768 2769 return error; 2770 } 2771 2772 /* 2773 * Perform rate limit check. 2774 * Returns 0 if it is okay to send the icmp6 packet. 2775 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2776 * limitation. 2777 * 2778 * XXX per-destination/type check necessary? 2779 */ 2780 static int 2781 icmp6_ratelimit( 2782 const struct in6_addr *dst, /* not used at this moment */ 2783 const int type, /* not used at this moment */ 2784 const int code) /* not used at this moment */ 2785 { 2786 int ret; 2787 2788 ret = 0; /* okay to send */ 2789 2790 /* PPS limit */ 2791 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2792 icmp6errppslim)) { 2793 /* The packet is subject to rate limit */ 2794 ret++; 2795 } 2796 2797 return ret; 2798 } 2799 2800 static struct rtentry * 2801 icmp6_mtudisc_clone(struct sockaddr *dst) 2802 { 2803 struct rtentry *rt; 2804 int error; 2805 2806 rt = rtalloc1(dst, 1); 2807 if (rt == NULL) 2808 return NULL; 2809 2810 /* If we didn't get a host route, allocate one */ 2811 if ((rt->rt_flags & RTF_HOST) == 0) { 2812 struct rtentry *nrt; 2813 2814 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2815 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2816 if (error) { 2817 rt_unref(rt); 2818 return NULL; 2819 } 2820 nrt->rt_rmx = rt->rt_rmx; 2821 rt_unref(rt); 2822 rt = nrt; 2823 } 2824 2825 mutex_enter(&icmp6_mtx); 2826 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2827 icmp6_mtudisc_timeout_q); 2828 mutex_exit(&icmp6_mtx); 2829 2830 if (error) { 2831 rt_unref(rt); 2832 return NULL; 2833 } 2834 2835 return rt; /* caller need to call rtfree() */ 2836 } 2837 2838 static void 2839 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2840 { 2841 2842 KASSERT(rt != NULL); 2843 rt_assert_referenced(rt); 2844 2845 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2846 (RTF_DYNAMIC | RTF_HOST)) { 2847 rtrequest(RTM_DELETE, rt_getkey(rt), 2848 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2849 } else { 2850 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2851 rt->rt_rmx.rmx_mtu = 0; 2852 } 2853 } 2854 2855 static void 2856 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2857 { 2858 2859 KASSERT(rt != NULL); 2860 rt_assert_referenced(rt); 2861 2862 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2863 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2864 rtrequest(RTM_DELETE, rt_getkey(rt), 2865 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2866 } 2867 } 2868 2869 /* 2870 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2871 */ 2872 static int 2873 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2874 { 2875 (void)&name; 2876 (void)&l; 2877 (void)&oname; 2878 2879 if (namelen != 0) 2880 return (EINVAL); 2881 2882 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2883 /*XXXUNCONST*/ 2884 __UNCONST(newp), newlen)); 2885 } 2886 2887 static int 2888 sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2889 { 2890 2891 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2892 } 2893 2894 static int 2895 sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2896 { 2897 int error, tmp; 2898 struct sysctlnode node; 2899 2900 mutex_enter(&icmp6_mtx); 2901 2902 node = *rnode; 2903 node.sysctl_data = &tmp; 2904 tmp = icmp6_redirtimeout; 2905 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2906 if (error || newp == NULL) 2907 goto out; 2908 if (tmp < 0) { 2909 error = EINVAL; 2910 goto out; 2911 } 2912 icmp6_redirtimeout = tmp; 2913 2914 if (icmp6_redirect_timeout_q != NULL) { 2915 if (icmp6_redirtimeout == 0) { 2916 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2917 } else { 2918 rt_timer_queue_change(icmp6_redirect_timeout_q, 2919 icmp6_redirtimeout); 2920 } 2921 } else if (icmp6_redirtimeout > 0) { 2922 icmp6_redirect_timeout_q = 2923 rt_timer_queue_create(icmp6_redirtimeout); 2924 } 2925 error = 0; 2926 out: 2927 mutex_exit(&icmp6_mtx); 2928 return error; 2929 } 2930 2931 static void 2932 sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2933 { 2934 extern int nd6_maxqueuelen; /* defined in nd6.c */ 2935 2936 sysctl_createv(clog, 0, NULL, NULL, 2937 CTLFLAG_PERMANENT, 2938 CTLTYPE_NODE, "inet6", NULL, 2939 NULL, 0, NULL, 0, 2940 CTL_NET, PF_INET6, CTL_EOL); 2941 sysctl_createv(clog, 0, NULL, NULL, 2942 CTLFLAG_PERMANENT, 2943 CTLTYPE_NODE, "icmp6", 2944 SYSCTL_DESCR("ICMPv6 related settings"), 2945 NULL, 0, NULL, 0, 2946 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2947 2948 sysctl_createv(clog, 0, NULL, NULL, 2949 CTLFLAG_PERMANENT, 2950 CTLTYPE_STRUCT, "stats", 2951 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2952 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2953 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2954 ICMPV6CTL_STATS, CTL_EOL); 2955 sysctl_createv(clog, 0, NULL, NULL, 2956 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2957 CTLTYPE_INT, "rediraccept", 2958 SYSCTL_DESCR("Accept and process redirect messages"), 2959 NULL, 0, &icmp6_rediraccept, 0, 2960 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2961 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2962 sysctl_createv(clog, 0, NULL, NULL, 2963 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2964 CTLTYPE_INT, "redirtimeout", 2965 SYSCTL_DESCR("Redirect generated route lifetime"), 2966 sysctl_net_inet6_icmp6_redirtimeout, 0, 2967 &icmp6_redirtimeout, 0, 2968 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2969 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2970 #if 0 /* obsoleted */ 2971 sysctl_createv(clog, 0, NULL, NULL, 2972 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2973 CTLTYPE_INT, "errratelimit", NULL, 2974 NULL, 0, &icmp6_errratelimit, 0, 2975 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2976 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2977 #endif 2978 sysctl_createv(clog, 0, NULL, NULL, 2979 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2980 CTLTYPE_INT, "nd6_prune", 2981 SYSCTL_DESCR("Neighbor discovery prune interval"), 2982 NULL, 0, &nd6_prune, 0, 2983 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2984 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2985 sysctl_createv(clog, 0, NULL, NULL, 2986 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2987 CTLTYPE_INT, "nd6_delay", 2988 SYSCTL_DESCR("First probe delay time"), 2989 NULL, 0, &nd6_delay, 0, 2990 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2991 ICMPV6CTL_ND6_DELAY, CTL_EOL); 2992 sysctl_createv(clog, 0, NULL, NULL, 2993 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2994 CTLTYPE_INT, "nd6_umaxtries", 2995 SYSCTL_DESCR("Number of unicast discovery attempts"), 2996 NULL, 0, &nd6_umaxtries, 0, 2997 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2998 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 2999 sysctl_createv(clog, 0, NULL, NULL, 3000 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3001 CTLTYPE_INT, "nd6_mmaxtries", 3002 SYSCTL_DESCR("Number of multicast discovery attempts"), 3003 NULL, 0, &nd6_mmaxtries, 0, 3004 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3005 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 3006 sysctl_createv(clog, 0, NULL, NULL, 3007 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3008 CTLTYPE_INT, "nd6_useloopback", 3009 SYSCTL_DESCR("Use loopback interface for local traffic"), 3010 NULL, 0, &nd6_useloopback, 0, 3011 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3012 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 3013 #if 0 /* obsoleted */ 3014 sysctl_createv(clog, 0, NULL, NULL, 3015 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3016 CTLTYPE_INT, "nd6_proxyall", NULL, 3017 NULL, 0, &nd6_proxyall, 0, 3018 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3019 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 3020 #endif 3021 sysctl_createv(clog, 0, NULL, NULL, 3022 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3023 CTLTYPE_INT, "nodeinfo", 3024 SYSCTL_DESCR("Respond to node information requests"), 3025 NULL, 0, &icmp6_nodeinfo, 0, 3026 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3027 ICMPV6CTL_NODEINFO, CTL_EOL); 3028 sysctl_createv(clog, 0, NULL, NULL, 3029 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3030 CTLTYPE_INT, "errppslimit", 3031 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 3032 NULL, 0, &icmp6errppslim, 0, 3033 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3034 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 3035 sysctl_createv(clog, 0, NULL, NULL, 3036 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3037 CTLTYPE_INT, "nd6_maxnudhint", 3038 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 3039 NULL, 0, &nd6_maxnudhint, 0, 3040 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3041 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 3042 sysctl_createv(clog, 0, NULL, NULL, 3043 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3044 CTLTYPE_INT, "mtudisc_hiwat", 3045 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3046 NULL, 0, &icmp6_mtudisc_hiwat, 0, 3047 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3048 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 3049 sysctl_createv(clog, 0, NULL, NULL, 3050 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3051 CTLTYPE_INT, "mtudisc_lowat", 3052 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3053 NULL, 0, &icmp6_mtudisc_lowat, 0, 3054 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3055 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 3056 sysctl_createv(clog, 0, NULL, NULL, 3057 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3058 CTLTYPE_INT, "nd6_debug", 3059 SYSCTL_DESCR("Enable neighbor discovery debug output"), 3060 NULL, 0, &nd6_debug, 0, 3061 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3062 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 3063 sysctl_createv(clog, 0, NULL, NULL, 3064 CTLFLAG_PERMANENT, 3065 CTLTYPE_STRUCT, "nd6_drlist", 3066 SYSCTL_DESCR("Default router list"), 3067 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3068 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3069 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 3070 sysctl_createv(clog, 0, NULL, NULL, 3071 CTLFLAG_PERMANENT, 3072 CTLTYPE_STRUCT, "nd6_prlist", 3073 SYSCTL_DESCR("Prefix list"), 3074 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3075 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3076 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 3077 sysctl_createv(clog, 0, NULL, NULL, 3078 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3079 CTLTYPE_INT, "maxqueuelen", 3080 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3081 NULL, 1, &nd6_maxqueuelen, 0, 3082 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3083 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3084 } 3085 3086 void 3087 icmp6_statinc(u_int stat) 3088 { 3089 3090 KASSERT(stat < ICMP6_NSTATS); 3091 ICMP6_STATINC(stat); 3092 } 3093