1 /* $NetBSD: icmp6.c,v 1.238 2018/06/01 07:13:35 ozaki-r Exp $ */ 2 /* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: icmp6.c,v 1.238 2018/06/01 07:13:35 ozaki-r Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_inet.h" 69 #include "opt_ipsec.h" 70 #endif 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/kmem.h> 75 #include <sys/mbuf.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/time.h> 80 #include <sys/kernel.h> 81 #include <sys/syslog.h> 82 #include <sys/domain.h> 83 #include <sys/sysctl.h> 84 85 #include <net/if.h> 86 #include <net/route.h> 87 #include <net/if_dl.h> 88 #include <net/if_types.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <netinet/ip6.h> 93 #include <netinet/wqinput.h> 94 #include <netinet6/ip6_var.h> 95 #include <netinet6/ip6_private.h> 96 #include <netinet/icmp6.h> 97 #include <netinet6/icmp6_private.h> 98 #include <netinet6/mld6_var.h> 99 #include <netinet6/in6_pcb.h> 100 #include <netinet6/nd6.h> 101 #include <netinet6/in6_ifattach.h> 102 #include <netinet6/ip6protosw.h> 103 #include <netinet6/scope6_var.h> 104 105 #ifdef IPSEC 106 #include <netipsec/ipsec.h> 107 #include <netipsec/ipsec6.h> 108 #include <netipsec/key.h> 109 #endif 110 111 #include "faith.h" 112 #if defined(NFAITH) && 0 < NFAITH 113 #include <net/if_faith.h> 114 #endif 115 116 extern struct domain inet6domain; 117 118 percpu_t *icmp6stat_percpu; 119 120 extern struct inpcbtable raw6cbtable; 121 extern int icmp6errppslim; 122 static int icmp6errpps_count = 0; 123 static struct timeval icmp6errppslim_last; 124 extern int icmp6_nodeinfo; 125 126 /* 127 * List of callbacks to notify when Path MTU changes are made. 128 */ 129 struct icmp6_mtudisc_callback { 130 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 131 void (*mc_func)(struct in6_addr *); 132 }; 133 134 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 135 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 136 137 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 138 extern int pmtu_expire; 139 140 /* XXX do these values make any sense? */ 141 static int icmp6_mtudisc_hiwat = 1280; 142 static int icmp6_mtudisc_lowat = 256; 143 144 /* 145 * keep track of # of redirect routes. 146 */ 147 static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 148 149 /* XXX experimental, turned off */ 150 static int icmp6_redirect_hiwat = -1; 151 static int icmp6_redirect_lowat = -1; 152 153 /* Protect mtudisc and redirect stuffs */ 154 static kmutex_t icmp6_mtx __cacheline_aligned; 155 156 static void icmp6_errcount(u_int, int, int); 157 static int icmp6_rip6_input(struct mbuf **, int); 158 static void icmp6_reflect(struct mbuf *, size_t); 159 static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 160 static const char *icmp6_redirect_diag(char *, size_t, struct in6_addr *, 161 struct in6_addr *, struct in6_addr *); 162 static void icmp6_redirect_input(struct mbuf *, int); 163 static struct mbuf *ni6_input(struct mbuf *, int); 164 static struct mbuf *ni6_nametodns(const char *, int, int); 165 static int ni6_dnsmatch(const char *, int, const char *, int); 166 static int ni6_addrs(struct icmp6_nodeinfo *, struct ifnet **, char *, 167 struct psref *); 168 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 169 struct ifnet *, int); 170 static int icmp6_notify_error(struct mbuf *, int, int, int); 171 static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 172 static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 173 static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 174 static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 175 176 /* workqueue-based pr_input */ 177 static struct wqinput *icmp6_wqinput; 178 static void _icmp6_input(struct mbuf *m, int off, int proto); 179 180 void 181 icmp6_init(void) 182 { 183 184 sysctl_net_inet6_icmp6_setup(NULL); 185 mld_init(); 186 187 mutex_init(&icmp6_mtx, MUTEX_DEFAULT, IPL_NONE); 188 mutex_enter(&icmp6_mtx); 189 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 190 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 191 mutex_exit(&icmp6_mtx); 192 193 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS); 194 195 icmp6_wqinput = wqinput_create("icmp6", _icmp6_input); 196 } 197 198 static void 199 icmp6_errcount(u_int base, int type, int code) 200 { 201 switch (type) { 202 case ICMP6_DST_UNREACH: 203 switch (code) { 204 case ICMP6_DST_UNREACH_NOROUTE: 205 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE); 206 return; 207 case ICMP6_DST_UNREACH_ADMIN: 208 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN); 209 return; 210 case ICMP6_DST_UNREACH_BEYONDSCOPE: 211 ICMP6_STATINC(base + 212 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE); 213 return; 214 case ICMP6_DST_UNREACH_ADDR: 215 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR); 216 return; 217 case ICMP6_DST_UNREACH_NOPORT: 218 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT); 219 return; 220 } 221 break; 222 case ICMP6_PACKET_TOO_BIG: 223 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG); 224 return; 225 case ICMP6_TIME_EXCEEDED: 226 switch (code) { 227 case ICMP6_TIME_EXCEED_TRANSIT: 228 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT); 229 return; 230 case ICMP6_TIME_EXCEED_REASSEMBLY: 231 ICMP6_STATINC(base + 232 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY); 233 return; 234 } 235 break; 236 case ICMP6_PARAM_PROB: 237 switch (code) { 238 case ICMP6_PARAMPROB_HEADER: 239 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER); 240 return; 241 case ICMP6_PARAMPROB_NEXTHEADER: 242 ICMP6_STATINC(base + 243 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER); 244 return; 245 case ICMP6_PARAMPROB_OPTION: 246 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION); 247 return; 248 } 249 break; 250 case ND_REDIRECT: 251 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT); 252 return; 253 } 254 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN); 255 } 256 257 /* 258 * Register a Path MTU Discovery callback. 259 */ 260 void 261 icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *)) 262 { 263 struct icmp6_mtudisc_callback *mc, *new; 264 265 new = kmem_alloc(sizeof(*mc), KM_SLEEP); 266 267 mutex_enter(&icmp6_mtx); 268 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 269 mc = LIST_NEXT(mc, mc_list)) { 270 if (mc->mc_func == func) { 271 mutex_exit(&icmp6_mtx); 272 kmem_free(new, sizeof(*mc)); 273 return; 274 } 275 } 276 277 new->mc_func = func; 278 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, new, mc_list); 279 mutex_exit(&icmp6_mtx); 280 } 281 282 /* 283 * A wrapper function for icmp6_error() necessary when the erroneous packet 284 * may not contain enough scope zone information. 285 */ 286 void 287 icmp6_error2(struct mbuf *m, int type, int code, int param, 288 struct ifnet *ifp) 289 { 290 struct ip6_hdr *ip6; 291 292 KASSERT(ifp != NULL); 293 294 if (m->m_len < sizeof(struct ip6_hdr)) { 295 m = m_pullup(m, sizeof(struct ip6_hdr)); 296 if (m == NULL) 297 return; 298 } 299 300 ip6 = mtod(m, struct ip6_hdr *); 301 302 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 303 goto out; 304 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 305 goto out; 306 307 icmp6_error(m, type, code, param); 308 return; 309 310 out: 311 m_freem(m); 312 } 313 314 /* 315 * Generate an error packet of type error in response to bad IP6 packet. 316 */ 317 void 318 icmp6_error(struct mbuf *m, int type, int code, int param) 319 { 320 struct ip6_hdr *oip6, *nip6; 321 struct icmp6_hdr *icmp6; 322 u_int preplen; 323 int off; 324 int nxt; 325 326 ICMP6_STATINC(ICMP6_STAT_ERROR); 327 328 /* count per-type-code statistics */ 329 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); 330 331 if (m->m_flags & M_DECRYPTED) { 332 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 333 goto freeit; 334 } 335 336 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && 337 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) 338 return; 339 oip6 = mtod(m, struct ip6_hdr *); 340 341 /* 342 * If the destination address of the erroneous packet is a multicast 343 * address, or the packet was sent using link-layer multicast, 344 * we should basically suppress sending an error (RFC 2463, Section 345 * 2.4). 346 * We have two exceptions (the item e.2 in that section): 347 * - the Packet Too Big message can be sent for path MTU discovery. 348 * - the Parameter Problem Message that can be allowed an icmp6 error 349 * in the option type field. This check has been done in 350 * ip6_unknown_opt(), so we can just check the type and code. 351 */ 352 if ((m->m_flags & (M_BCAST|M_MCAST) || 353 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 354 (type != ICMP6_PACKET_TOO_BIG && 355 (type != ICMP6_PARAM_PROB || 356 code != ICMP6_PARAMPROB_OPTION))) 357 goto freeit; 358 359 /* 360 * RFC 2463, 2.4 (e.5): source address check. 361 * XXX: the case of anycast source? 362 */ 363 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 364 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 365 goto freeit; 366 367 /* 368 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 369 * don't do it. 370 */ 371 nxt = -1; 372 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 373 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 374 struct icmp6_hdr *icp; 375 376 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 377 sizeof(*icp)); 378 if (icp == NULL) { 379 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 380 return; 381 } 382 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 383 icp->icmp6_type == ND_REDIRECT) { 384 /* 385 * ICMPv6 error 386 * Special case: for redirect (which is 387 * informational) we must not send icmp6 error. 388 */ 389 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 390 goto freeit; 391 } else { 392 /* ICMPv6 informational - send the error */ 393 } 394 } else { 395 /* non-ICMPv6 - send the error */ 396 } 397 398 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 399 400 /* Finally, do rate limitation check. */ 401 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 402 ICMP6_STATINC(ICMP6_STAT_TOOFREQ); 403 goto freeit; 404 } 405 406 /* 407 * OK, ICMP6 can be generated. 408 */ 409 410 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 411 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 412 413 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 414 M_PREPEND(m, preplen, M_DONTWAIT); 415 if (m && M_UNWRITABLE(m, preplen)) 416 m = m_pullup(m, preplen); 417 if (m == NULL) { 418 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__); 419 return; 420 } 421 422 nip6 = mtod(m, struct ip6_hdr *); 423 nip6->ip6_src = oip6->ip6_src; 424 nip6->ip6_dst = oip6->ip6_dst; 425 426 in6_clearscope(&oip6->ip6_src); 427 in6_clearscope(&oip6->ip6_dst); 428 429 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 430 icmp6->icmp6_type = type; 431 icmp6->icmp6_code = code; 432 icmp6->icmp6_pptr = htonl((u_int32_t)param); 433 434 /* 435 * icmp6_reflect() is designed to be in the input path. 436 * icmp6_error() can be called from both input and output path, 437 * and if we are in output path rcvif could contain bogus value. 438 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 439 * information in ip header (nip6). 440 */ 441 m_reset_rcvif(m); 442 443 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 444 445 /* header order: IPv6 - ICMPv6 */ 446 icmp6_reflect(m, sizeof(struct ip6_hdr)); 447 448 return; 449 450 freeit: 451 /* 452 * If we can't tell whether or not we can generate ICMP6, free it. 453 */ 454 m_freem(m); 455 } 456 457 /* 458 * Process a received ICMP6 message. 459 */ 460 static void 461 _icmp6_input(struct mbuf *m, int off, int proto) 462 { 463 struct mbuf *n; 464 struct ip6_hdr *ip6, *nip6; 465 struct icmp6_hdr *icmp6, *nicmp6; 466 int icmp6len = m->m_pkthdr.len - off; 467 int code, sum; 468 struct ifnet *rcvif; 469 struct psref psref; 470 char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN]; 471 472 rcvif = m_get_rcvif_psref(m, &psref); 473 if (__predict_false(rcvif == NULL)) 474 goto freeit; 475 476 #define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 477 KASSERT(ICMP6_MAXLEN < MCLBYTES); 478 icmp6_ifstat_inc(rcvif, ifs6_in_msg); 479 480 /* 481 * Locate icmp6 structure in mbuf, and check 482 * that not corrupted and of at least minimum length 483 */ 484 485 if (icmp6len < sizeof(struct icmp6_hdr)) { 486 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 487 icmp6_ifstat_inc(rcvif, ifs6_in_error); 488 goto freeit; 489 } 490 491 if (m->m_len < sizeof(struct ip6_hdr)) { 492 m = m_pullup(m, sizeof(struct ip6_hdr)); 493 if (m == NULL) { 494 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 495 icmp6_ifstat_inc(rcvif, ifs6_in_error); 496 goto freeit; 497 } 498 } 499 500 ip6 = mtod(m, struct ip6_hdr *); 501 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 502 if (icmp6 == NULL) { 503 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 504 icmp6_ifstat_inc(rcvif, ifs6_in_error); 505 goto freeit; 506 } 507 508 /* 509 * Enforce alignment requirements that are violated in 510 * some cases, see kern/50766 for details. 511 */ 512 if (IP6_HDR_ALIGNED_P(icmp6) == 0) { 513 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0); 514 if (m == NULL) { 515 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 516 icmp6_ifstat_inc(rcvif, ifs6_in_error); 517 goto freeit; 518 } 519 ip6 = mtod(m, struct ip6_hdr *); 520 icmp6 = (struct icmp6_hdr *)(mtod(m, char *) + off); 521 } 522 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 523 524 /* 525 * calculate the checksum 526 */ 527 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 528 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 529 icmp6->icmp6_type, sum, IN6_PRINT(ip6buf, &ip6->ip6_src)); 530 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 531 icmp6_ifstat_inc(rcvif, ifs6_in_error); 532 goto freeit; 533 } 534 535 #if defined(NFAITH) && 0 < NFAITH 536 if (faithprefix(&ip6->ip6_dst)) { 537 /* 538 * Deliver very specific ICMP6 type only. 539 * This is important to deliver TOOBIG. Otherwise PMTUD 540 * will not work. 541 */ 542 switch (icmp6->icmp6_type) { 543 case ICMP6_DST_UNREACH: 544 case ICMP6_PACKET_TOO_BIG: 545 case ICMP6_TIME_EXCEEDED: 546 break; 547 default: 548 goto freeit; 549 } 550 } 551 #endif 552 553 code = icmp6->icmp6_code; 554 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 555 556 switch (icmp6->icmp6_type) { 557 case ICMP6_DST_UNREACH: 558 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 559 switch (code) { 560 case ICMP6_DST_UNREACH_NOROUTE: 561 code = PRC_UNREACH_NET; 562 break; 563 case ICMP6_DST_UNREACH_ADMIN: 564 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 565 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 566 break; 567 case ICMP6_DST_UNREACH_ADDR: 568 code = PRC_HOSTDEAD; 569 break; 570 case ICMP6_DST_UNREACH_BEYONDSCOPE: 571 /* I mean "source address was incorrect." */ 572 code = PRC_UNREACH_NET; 573 break; 574 case ICMP6_DST_UNREACH_NOPORT: 575 code = PRC_UNREACH_PORT; 576 break; 577 default: 578 goto badcode; 579 } 580 goto deliver; 581 582 case ICMP6_PACKET_TOO_BIG: 583 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 584 585 /* 586 * MTU is checked in icmp6_mtudisc. 587 */ 588 code = PRC_MSGSIZE; 589 590 /* 591 * Updating the path MTU will be done after examining 592 * intermediate extension headers. 593 */ 594 goto deliver; 595 596 case ICMP6_TIME_EXCEEDED: 597 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 598 switch (code) { 599 case ICMP6_TIME_EXCEED_TRANSIT: 600 code = PRC_TIMXCEED_INTRANS; 601 break; 602 case ICMP6_TIME_EXCEED_REASSEMBLY: 603 code = PRC_TIMXCEED_REASS; 604 break; 605 default: 606 goto badcode; 607 } 608 goto deliver; 609 610 case ICMP6_PARAM_PROB: 611 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 612 switch (code) { 613 case ICMP6_PARAMPROB_NEXTHEADER: 614 code = PRC_UNREACH_PROTOCOL; 615 break; 616 case ICMP6_PARAMPROB_HEADER: 617 case ICMP6_PARAMPROB_OPTION: 618 code = PRC_PARAMPROB; 619 break; 620 default: 621 goto badcode; 622 } 623 goto deliver; 624 625 case ICMP6_ECHO_REQUEST: 626 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 627 if (code != 0) 628 goto badcode; 629 /* 630 * Copy mbuf to send to two data paths: userland socket(s), 631 * and to the querier (echo reply). 632 * m: a copy for socket, n: a copy for querier 633 * 634 * If the first mbuf is shared, or the first mbuf is too short, 635 * copy the first part of the data into a fresh mbuf. 636 * Otherwise, we will wrongly overwrite both copies. 637 */ 638 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 639 /* Give up local */ 640 n = m; 641 m = NULL; 642 } else if (M_UNWRITABLE(n, off + sizeof(struct icmp6_hdr))) { 643 struct mbuf *n0 = n; 644 645 /* 646 * Prepare an internal mbuf. m_pullup() doesn't 647 * always copy the length we specified. 648 */ 649 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 650 /* Give up local */ 651 n = m; 652 m = NULL; 653 } 654 m_freem(n0); 655 } 656 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 657 sizeof(*nicmp6)); 658 if (nicmp6 == NULL) 659 goto freeit; 660 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 661 nicmp6->icmp6_code = 0; 662 if (n) { 663 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 664 icmp6s[ICMP6_STAT_REFLECT]++; 665 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 666 ICMP6_STAT_PUTREF(); 667 icmp6_reflect(n, off); 668 } 669 if (!m) 670 goto freeit; 671 break; 672 673 case ICMP6_ECHO_REPLY: 674 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 675 if (code != 0) 676 goto badcode; 677 break; 678 679 case MLD_LISTENER_QUERY: 680 case MLD_LISTENER_REPORT: 681 if (icmp6len < sizeof(struct mld_hdr)) 682 goto badlen; 683 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 684 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 685 else 686 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 687 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 688 /* give up local */ 689 mld_input(m, off); 690 m = NULL; 691 goto freeit; 692 } 693 mld_input(n, off); 694 /* m stays. */ 695 break; 696 697 case MLD_LISTENER_DONE: 698 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 699 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 700 goto badlen; 701 break; /* nothing to be done in kernel */ 702 703 case MLD_MTRACE_RESP: 704 case MLD_MTRACE: 705 /* XXX: these two are experimental. not officially defined. */ 706 /* XXX: per-interface statistics? */ 707 break; /* just pass it to applications */ 708 709 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 710 { 711 enum { WRU, FQDN } mode; 712 713 if (!icmp6_nodeinfo) 714 break; 715 716 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 717 mode = WRU; 718 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 719 mode = FQDN; 720 else 721 goto badlen; 722 723 if (mode == FQDN) { 724 n = m_copypacket(m, M_DONTWAIT); 725 if (n) 726 n = ni6_input(n, off); 727 } else { 728 u_char *p; 729 int maxhlen; 730 731 if ((icmp6_nodeinfo & 5) != 5) 732 break; 733 734 if (code != 0) 735 goto badcode; 736 MGETHDR(n, M_DONTWAIT, m->m_type); 737 if (n && ICMP6_MAXLEN > MHLEN) { 738 MCLGET(n, M_DONTWAIT); 739 if ((n->m_flags & M_EXT) == 0) { 740 m_free(n); 741 n = NULL; 742 } 743 } 744 if (n == NULL) { 745 /* Give up remote */ 746 break; 747 } 748 m_reset_rcvif(n); 749 n->m_len = 0; 750 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 751 if (maxhlen < 0) { 752 m_free(n); 753 break; 754 } 755 if (maxhlen > hostnamelen) 756 maxhlen = hostnamelen; 757 /* 758 * Copy IPv6 and ICMPv6 only. 759 */ 760 nip6 = mtod(n, struct ip6_hdr *); 761 memcpy(nip6, ip6, sizeof(struct ip6_hdr)); 762 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 763 memcpy(nicmp6, icmp6, sizeof(struct icmp6_hdr)); 764 765 p = (u_char *)(nicmp6 + 1); 766 memset(p, 0, 4); 767 memcpy(p + 4, hostname, maxhlen); /* meaningless TTL */ 768 769 M_COPY_PKTHDR(n, m); 770 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 771 sizeof(struct icmp6_hdr) + 4 + maxhlen; 772 nicmp6->icmp6_type = ICMP6_WRUREPLY; 773 nicmp6->icmp6_code = 0; 774 } 775 if (n) { 776 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 777 icmp6s[ICMP6_STAT_REFLECT]++; 778 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 779 ICMP6_STAT_PUTREF(); 780 icmp6_reflect(n, sizeof(struct ip6_hdr)); 781 } 782 break; 783 } 784 785 case ICMP6_WRUREPLY: 786 if (code != 0) 787 goto badcode; 788 break; 789 790 case ND_ROUTER_SOLICIT: 791 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 792 if (code != 0) 793 goto badcode; 794 if (icmp6len < sizeof(struct nd_router_solicit)) 795 goto badlen; 796 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 797 /* give up local */ 798 nd6_rs_input(m, off, icmp6len); 799 m = NULL; 800 goto freeit; 801 } 802 nd6_rs_input(n, off, icmp6len); 803 /* m stays. */ 804 break; 805 806 case ND_ROUTER_ADVERT: 807 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 808 if (code != 0) 809 goto badcode; 810 if (icmp6len < sizeof(struct nd_router_advert)) 811 goto badlen; 812 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 813 /* give up local */ 814 nd6_ra_input(m, off, icmp6len); 815 m = NULL; 816 goto freeit; 817 } 818 nd6_ra_input(n, off, icmp6len); 819 /* m stays. */ 820 break; 821 822 case ND_NEIGHBOR_SOLICIT: 823 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 824 if (code != 0) 825 goto badcode; 826 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 827 goto badlen; 828 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 829 /* give up local */ 830 nd6_ns_input(m, off, icmp6len); 831 m = NULL; 832 goto freeit; 833 } 834 nd6_ns_input(n, off, icmp6len); 835 /* m stays. */ 836 break; 837 838 case ND_NEIGHBOR_ADVERT: 839 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 840 if (code != 0) 841 goto badcode; 842 if (icmp6len < sizeof(struct nd_neighbor_advert)) 843 goto badlen; 844 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 845 /* give up local */ 846 nd6_na_input(m, off, icmp6len); 847 m = NULL; 848 goto freeit; 849 } 850 nd6_na_input(n, off, icmp6len); 851 /* m stays. */ 852 break; 853 854 case ND_REDIRECT: 855 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 856 if (code != 0) 857 goto badcode; 858 if (icmp6len < sizeof(struct nd_redirect)) 859 goto badlen; 860 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) { 861 /* give up local */ 862 icmp6_redirect_input(m, off); 863 m = NULL; 864 goto freeit; 865 } 866 icmp6_redirect_input(n, off); 867 /* m stays. */ 868 break; 869 870 case ICMP6_ROUTER_RENUMBERING: 871 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 872 code != ICMP6_ROUTER_RENUMBERING_RESULT) 873 goto badcode; 874 if (icmp6len < sizeof(struct icmp6_router_renum)) 875 goto badlen; 876 break; 877 878 default: 879 nd6log(LOG_DEBUG, 880 "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 881 icmp6->icmp6_type, 882 IN6_PRINT(ip6buf, &ip6->ip6_src), 883 IN6_PRINT(ip6buf2, &ip6->ip6_dst), 884 rcvif ? rcvif->if_index : 0); 885 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 886 /* ICMPv6 error: MUST deliver it by spec... */ 887 code = PRC_NCMDS; 888 /* deliver */ 889 } else { 890 /* ICMPv6 informational: MUST not deliver */ 891 break; 892 } 893 deliver: 894 if (icmp6_notify_error(m, off, icmp6len, code)) { 895 /* In this case, m should've been freed. */ 896 m_put_rcvif_psref(rcvif, &psref); 897 return; 898 } 899 break; 900 901 badcode: 902 ICMP6_STATINC(ICMP6_STAT_BADCODE); 903 break; 904 905 badlen: 906 ICMP6_STATINC(ICMP6_STAT_BADLEN); 907 break; 908 } 909 m_put_rcvif_psref(rcvif, &psref); 910 911 /* deliver the packet to appropriate sockets */ 912 icmp6_rip6_input(&m, off); 913 914 return; 915 916 freeit: 917 m_put_rcvif_psref(rcvif, &psref); 918 m_freem(m); 919 return; 920 } 921 922 int 923 icmp6_input(struct mbuf **mp, int *offp, int proto) 924 { 925 926 wqinput_input(icmp6_wqinput, *mp, *offp, proto); 927 928 return IPPROTO_DONE; 929 } 930 931 static int 932 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 933 { 934 struct icmp6_hdr *icmp6; 935 struct ip6_hdr *eip6; 936 u_int32_t notifymtu; 937 struct sockaddr_in6 icmp6src, icmp6dst; 938 939 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 940 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 941 goto freeit; 942 } 943 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 944 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 945 if (icmp6 == NULL) { 946 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 947 return (-1); 948 } 949 eip6 = (struct ip6_hdr *)(icmp6 + 1); 950 951 /* Detect the upper level protocol */ 952 { 953 void (*ctlfunc)(int, struct sockaddr *, void *); 954 u_int8_t nxt = eip6->ip6_nxt; 955 int eoff = off + sizeof(struct icmp6_hdr) + 956 sizeof(struct ip6_hdr); 957 struct ip6ctlparam ip6cp; 958 struct in6_addr *finaldst = NULL; 959 int icmp6type = icmp6->icmp6_type; 960 struct ip6_frag *fh; 961 struct ip6_rthdr *rth; 962 struct ifnet *rcvif; 963 int s; 964 965 while (1) { /* XXX: should avoid infinite loop explicitly? */ 966 struct ip6_ext *eh; 967 968 switch (nxt) { 969 case IPPROTO_HOPOPTS: 970 case IPPROTO_DSTOPTS: 971 case IPPROTO_AH: 972 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 973 eoff, sizeof(*eh)); 974 if (eh == NULL) { 975 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 976 return (-1); 977 } 978 979 if (nxt == IPPROTO_AH) 980 eoff += (eh->ip6e_len + 2) << 2; 981 else 982 eoff += (eh->ip6e_len + 1) << 3; 983 nxt = eh->ip6e_nxt; 984 break; 985 case IPPROTO_ROUTING: 986 /* Ignore the option. */ 987 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 988 eoff, sizeof(*rth)); 989 if (rth == NULL) { 990 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 991 return (-1); 992 } 993 994 eoff += (rth->ip6r_len + 1) << 3; 995 nxt = rth->ip6r_nxt; 996 break; 997 case IPPROTO_FRAGMENT: 998 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 999 eoff, sizeof(*fh)); 1000 if (fh == NULL) { 1001 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1002 return (-1); 1003 } 1004 /* 1005 * Data after a fragment header is meaningless 1006 * unless it is the first fragment, but 1007 * we'll go to the notify label for path MTU 1008 * discovery. 1009 */ 1010 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1011 goto notify; 1012 1013 eoff += sizeof(struct ip6_frag); 1014 nxt = fh->ip6f_nxt; 1015 break; 1016 default: 1017 /* 1018 * This case includes ESP and the No Next 1019 * Header. In such cases going to the notify 1020 * label does not have any meaning 1021 * (i.e. ctlfunc will be NULL), but we go 1022 * anyway since we might have to update 1023 * path MTU information. 1024 */ 1025 goto notify; 1026 } 1027 } 1028 notify: 1029 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1030 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1031 if (icmp6 == NULL) { 1032 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1033 return (-1); 1034 } 1035 1036 /* 1037 * retrieve parameters from the inner IPv6 header, and convert 1038 * them into sockaddr structures. 1039 * XXX: there is no guarantee that the source or destination 1040 * addresses of the inner packet are in the same scope zone as 1041 * the addresses of the icmp packet. But there is no other 1042 * way to determine the zone. 1043 */ 1044 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1045 1046 rcvif = m_get_rcvif(m, &s); 1047 if (__predict_false(rcvif == NULL)) 1048 goto freeit; 1049 sockaddr_in6_init(&icmp6dst, 1050 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1051 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1052 m_put_rcvif(rcvif, &s); 1053 goto freeit; 1054 } 1055 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1056 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1057 m_put_rcvif(rcvif, &s); 1058 goto freeit; 1059 } 1060 m_put_rcvif(rcvif, &s); 1061 1062 icmp6src.sin6_flowinfo = 1063 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1064 1065 if (finaldst == NULL) 1066 finaldst = &eip6->ip6_dst; 1067 ip6cp.ip6c_m = m; 1068 ip6cp.ip6c_icmp6 = icmp6; 1069 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1070 ip6cp.ip6c_off = eoff; 1071 ip6cp.ip6c_finaldst = finaldst; 1072 ip6cp.ip6c_src = &icmp6src; 1073 ip6cp.ip6c_nxt = nxt; 1074 1075 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1076 notifymtu = ntohl(icmp6->icmp6_mtu); 1077 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1078 } 1079 1080 ctlfunc = (void (*)(int, struct sockaddr *, void *)) 1081 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1082 if (ctlfunc) { 1083 (void)(*ctlfunc)(code, sin6tosa(&icmp6dst), &ip6cp); 1084 } 1085 } 1086 return (0); 1087 1088 freeit: 1089 m_freem(m); 1090 return (-1); 1091 } 1092 1093 void 1094 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1095 { 1096 unsigned long rtcount; 1097 struct icmp6_mtudisc_callback *mc; 1098 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1099 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1100 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1101 u_int mtu = ntohl(icmp6->icmp6_mtu); 1102 struct rtentry *rt = NULL; 1103 struct sockaddr_in6 sin6; 1104 struct ifnet *rcvif; 1105 int s; 1106 1107 /* 1108 * The MTU should not be less than the minimal IPv6 MTU except for the 1109 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1110 * In that one case, the MTU might be less than 1280. 1111 */ 1112 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1113 /* is the mtu even sane? */ 1114 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1115 return; 1116 if (!validated) 1117 return; 1118 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1119 } 1120 1121 /* 1122 * allow non-validated cases if memory is plenty, to make traffic 1123 * from non-connected pcb happy. 1124 */ 1125 mutex_enter(&icmp6_mtx); 1126 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1127 if (validated) { 1128 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) { 1129 mutex_exit(&icmp6_mtx); 1130 return; 1131 } else if (0 <= icmp6_mtudisc_lowat && 1132 rtcount > icmp6_mtudisc_lowat) { 1133 /* 1134 * XXX nuke a victim, install the new one. 1135 */ 1136 } 1137 } else { 1138 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) { 1139 mutex_exit(&icmp6_mtx); 1140 return; 1141 } 1142 } 1143 mutex_exit(&icmp6_mtx); 1144 1145 memset(&sin6, 0, sizeof(sin6)); 1146 sin6.sin6_family = PF_INET6; 1147 sin6.sin6_len = sizeof(struct sockaddr_in6); 1148 sin6.sin6_addr = *dst; 1149 rcvif = m_get_rcvif(m, &s); 1150 if (__predict_false(rcvif == NULL)) 1151 return; 1152 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1153 m_put_rcvif(rcvif, &s); 1154 return; 1155 } 1156 m_put_rcvif(rcvif, &s); 1157 1158 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1159 1160 if (rt && (rt->rt_flags & RTF_HOST) && 1161 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1162 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1163 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1164 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1165 rt->rt_rmx.rmx_mtu = mtu; 1166 } 1167 } 1168 if (rt) { 1169 rt_unref(rt); 1170 } 1171 1172 /* 1173 * Notify protocols that the MTU for this destination 1174 * has changed. 1175 */ 1176 mutex_enter(&icmp6_mtx); 1177 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1178 mc = LIST_NEXT(mc, mc_list)) 1179 (*mc->mc_func)(&sin6.sin6_addr); 1180 mutex_exit(&icmp6_mtx); 1181 } 1182 1183 /* 1184 * Process a Node Information Query packet, based on 1185 * draft-ietf-ipngwg-icmp-name-lookups-07. 1186 * 1187 * Spec incompatibilities: 1188 * - IPv6 Subject address handling 1189 * - IPv4 Subject address handling support missing 1190 * - Proxy reply (answer even if it's not for me) 1191 * - joins NI group address at in6_ifattach() time only, does not cope 1192 * with hostname changes by sethostname(3) 1193 */ 1194 static struct mbuf * 1195 ni6_input(struct mbuf *m, int off) 1196 { 1197 struct icmp6_nodeinfo *ni6, *nni6; 1198 struct mbuf *n = NULL; 1199 u_int16_t qtype; 1200 int subjlen; 1201 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1202 struct ni_reply_fqdn *fqdn; 1203 int addrs; /* for NI_QTYPE_NODEADDR */ 1204 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1205 struct sockaddr_in6 sin6; /* ip6_dst */ 1206 struct in6_addr in6_subj; /* subject address */ 1207 struct ip6_hdr *ip6; 1208 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1209 char *subj = NULL; 1210 struct ifnet *rcvif; 1211 int s, ss; 1212 struct ifaddr *ifa; 1213 struct psref psref; 1214 1215 ip6 = mtod(m, struct ip6_hdr *); 1216 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1217 if (ni6 == NULL) { 1218 /* m is already reclaimed */ 1219 return NULL; 1220 } 1221 KASSERT((m->m_flags & M_PKTHDR) != 0); 1222 1223 /* 1224 * Validate IPv6 destination address. 1225 * 1226 * The Responder must discard the Query without further processing 1227 * unless it is one of the Responder's unicast or anycast addresses, or 1228 * a link-local scope multicast address which the Responder has joined. 1229 * [icmp-name-lookups-07, Section 4.] 1230 */ 1231 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1232 /* XXX scopeid */ 1233 ss = pserialize_read_enter(); 1234 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1235 if (ifa != NULL) { 1236 ; /* unicast/anycast, fine */ 1237 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) { 1238 ; /* link-local multicast, fine */ 1239 } else { 1240 pserialize_read_exit(ss); 1241 goto bad; 1242 } 1243 pserialize_read_exit(ss); 1244 1245 /* validate query Subject field. */ 1246 qtype = ntohs(ni6->ni_qtype); 1247 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1248 switch (qtype) { 1249 case NI_QTYPE_NOOP: 1250 case NI_QTYPE_SUPTYPES: 1251 /* 07 draft */ 1252 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1253 break; 1254 /* FALLTHROUGH */ 1255 case NI_QTYPE_FQDN: 1256 case NI_QTYPE_NODEADDR: 1257 case NI_QTYPE_IPV4ADDR: 1258 switch (ni6->ni_code) { 1259 case ICMP6_NI_SUBJ_IPV6: 1260 #if ICMP6_NI_SUBJ_IPV6 != 0 1261 case 0: 1262 #endif 1263 /* 1264 * backward compatibility - try to accept 03 draft 1265 * format, where no Subject is present. 1266 */ 1267 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1268 subjlen == 0) { 1269 oldfqdn++; 1270 break; 1271 } 1272 #if ICMP6_NI_SUBJ_IPV6 != 0 1273 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1274 goto bad; 1275 #endif 1276 1277 if (subjlen != sizeof(sin6.sin6_addr)) 1278 goto bad; 1279 1280 /* 1281 * Validate Subject address. 1282 * 1283 * Not sure what exactly "address belongs to the node" 1284 * means in the spec, is it just unicast, or what? 1285 * 1286 * At this moment we consider Subject address as 1287 * "belong to the node" if the Subject address equals 1288 * to the IPv6 destination address; validation for 1289 * IPv6 destination address should have done enough 1290 * check for us. 1291 * 1292 * We do not do proxy at this moment. 1293 */ 1294 /* m_pulldown instead of copy? */ 1295 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1296 subjlen, (void *)&in6_subj); 1297 rcvif = m_get_rcvif(m, &s); 1298 if (__predict_false(rcvif == NULL)) 1299 goto bad; 1300 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1301 m_put_rcvif(rcvif, &s); 1302 goto bad; 1303 } 1304 m_put_rcvif(rcvif, &s); 1305 1306 subj = (char *)&in6_subj; 1307 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1308 break; 1309 1310 /* 1311 * XXX if we are to allow other cases, we should really 1312 * be careful about scope here. 1313 * basically, we should disallow queries toward IPv6 1314 * destination X with subject Y, if scope(X) > scope(Y). 1315 * if we allow scope(X) > scope(Y), it will result in 1316 * information leakage across scope boundary. 1317 */ 1318 goto bad; 1319 1320 case ICMP6_NI_SUBJ_FQDN: 1321 /* 1322 * Validate Subject name with gethostname(3). 1323 * 1324 * The behavior may need some debate, since: 1325 * - we are not sure if the node has FQDN as 1326 * hostname (returned by gethostname(3)). 1327 * - the code does wildcard match for truncated names. 1328 * however, we are not sure if we want to perform 1329 * wildcard match, if gethostname(3) side has 1330 * truncated hostname. 1331 */ 1332 n = ni6_nametodns(hostname, hostnamelen, 0); 1333 if (!n || n->m_next || n->m_len == 0) 1334 goto bad; 1335 IP6_EXTHDR_GET(subj, char *, m, 1336 off + sizeof(struct icmp6_nodeinfo), subjlen); 1337 if (subj == NULL) 1338 goto bad; 1339 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1340 n->m_len)) { 1341 goto bad; 1342 } 1343 m_freem(n); 1344 n = NULL; 1345 break; 1346 1347 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1348 default: 1349 goto bad; 1350 } 1351 break; 1352 } 1353 1354 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1355 switch (qtype) { 1356 case NI_QTYPE_FQDN: 1357 if ((icmp6_nodeinfo & 1) == 0) 1358 goto bad; 1359 break; 1360 case NI_QTYPE_NODEADDR: 1361 case NI_QTYPE_IPV4ADDR: 1362 if ((icmp6_nodeinfo & 2) == 0) 1363 goto bad; 1364 break; 1365 } 1366 1367 /* guess reply length */ 1368 switch (qtype) { 1369 case NI_QTYPE_NOOP: 1370 break; /* no reply data */ 1371 case NI_QTYPE_SUPTYPES: 1372 replylen += sizeof(u_int32_t); 1373 break; 1374 case NI_QTYPE_FQDN: 1375 /* will append an mbuf */ 1376 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1377 break; 1378 case NI_QTYPE_NODEADDR: 1379 addrs = ni6_addrs(ni6, &ifp, subj, &psref); 1380 replylen += addrs * 1381 (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1382 if (replylen > MCLBYTES) 1383 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1384 break; 1385 case NI_QTYPE_IPV4ADDR: 1386 /* unsupported - should respond with unknown Qtype? */ 1387 goto bad; 1388 default: 1389 /* 1390 * XXX: We must return a reply with the ICMP6 code 1391 * `unknown Qtype' in this case. However we regard the case 1392 * as an FQDN query for backward compatibility. 1393 * Older versions set a random value to this field, 1394 * so it rarely varies in the defined qtypes. 1395 * But the mechanism is not reliable... 1396 * maybe we should obsolete older versions. 1397 */ 1398 qtype = NI_QTYPE_FQDN; 1399 /* will append an mbuf */ 1400 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1401 oldfqdn++; 1402 break; 1403 } 1404 1405 /* allocate an mbuf to reply. */ 1406 MGETHDR(n, M_DONTWAIT, m->m_type); 1407 if (n == NULL) { 1408 goto bad; 1409 } 1410 M_MOVE_PKTHDR(n, m); 1411 if (replylen > MHLEN) { 1412 if (replylen > MCLBYTES) { 1413 /* 1414 * XXX: should we try to allocate more? But MCLBYTES 1415 * is probably much larger than IPV6_MMTU... 1416 */ 1417 goto bad; 1418 } 1419 MCLGET(n, M_DONTWAIT); 1420 if ((n->m_flags & M_EXT) == 0) { 1421 goto bad; 1422 } 1423 } 1424 n->m_pkthdr.len = n->m_len = replylen; 1425 1426 /* copy mbuf header and IPv6 + Node Information base headers */ 1427 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1428 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1429 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1430 1431 /* qtype dependent procedure */ 1432 switch (qtype) { 1433 case NI_QTYPE_NOOP: 1434 nni6->ni_code = ICMP6_NI_SUCCESS; 1435 nni6->ni_flags = 0; 1436 break; 1437 case NI_QTYPE_SUPTYPES: 1438 { 1439 u_int32_t v; 1440 nni6->ni_code = ICMP6_NI_SUCCESS; 1441 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1442 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1443 v = (u_int32_t)htonl(0x0000000f); 1444 memcpy(nni6 + 1, &v, sizeof(u_int32_t)); 1445 break; 1446 } 1447 case NI_QTYPE_FQDN: 1448 nni6->ni_code = ICMP6_NI_SUCCESS; 1449 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1450 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 1451 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1452 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1453 /* 1454 * XXX do we really have FQDN in variable "hostname"? 1455 */ 1456 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1457 if (n->m_next == NULL) 1458 goto bad; 1459 /* XXX we assume that n->m_next is not a chain */ 1460 if (n->m_next->m_next != NULL) 1461 goto bad; 1462 n->m_pkthdr.len += n->m_next->m_len; 1463 break; 1464 case NI_QTYPE_NODEADDR: 1465 { 1466 int lenlim, copied; 1467 1468 nni6->ni_code = ICMP6_NI_SUCCESS; 1469 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1470 sizeof(struct icmp6_nodeinfo); 1471 lenlim = M_TRAILINGSPACE(n); 1472 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1473 if_put(ifp, &psref); 1474 ifp = NULL; 1475 /* update mbuf length */ 1476 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1477 sizeof(struct icmp6_nodeinfo) + copied; 1478 break; 1479 } 1480 default: 1481 panic("%s: impossible", __func__); 1482 break; 1483 } 1484 1485 nni6->ni_type = ICMP6_NI_REPLY; 1486 m_freem(m); 1487 return n; 1488 1489 bad: 1490 if_put(ifp, &psref); 1491 m_freem(m); 1492 if (n) 1493 m_freem(n); 1494 return NULL; 1495 } 1496 1497 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1498 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1499 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1500 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1501 1502 /* 1503 * make a mbuf with DNS-encoded string. no compression support. 1504 * 1505 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1506 * treated as truncated name (two \0 at the end). this is a wild guess. 1507 * 1508 * old - return pascal string if non-zero 1509 */ 1510 static struct mbuf * 1511 ni6_nametodns(const char *name, int namelen, int old) 1512 { 1513 struct mbuf *m; 1514 char *cp, *ep; 1515 const char *p, *q; 1516 int i, len, nterm; 1517 1518 if (old) 1519 len = namelen + 1; 1520 else 1521 len = MCLBYTES; 1522 1523 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1524 MGET(m, M_DONTWAIT, MT_DATA); 1525 if (m && len > MLEN) { 1526 MCLGET(m, M_DONTWAIT); 1527 if ((m->m_flags & M_EXT) == 0) 1528 goto fail; 1529 } 1530 if (!m) 1531 goto fail; 1532 m->m_next = NULL; 1533 1534 if (old) { 1535 m->m_len = len; 1536 *mtod(m, char *) = namelen; 1537 memcpy(mtod(m, char *) + 1, name, namelen); 1538 return m; 1539 } else { 1540 m->m_len = 0; 1541 cp = mtod(m, char *); 1542 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1543 1544 /* if not certain about my name, return empty buffer */ 1545 if (namelen == 0) 1546 return m; 1547 1548 /* 1549 * guess if it looks like shortened hostname, or FQDN. 1550 * shortened hostname needs two trailing "\0". 1551 */ 1552 i = 0; 1553 for (p = name; p < name + namelen; p++) { 1554 if (*p == '.') 1555 i++; 1556 } 1557 if (i < 2) 1558 nterm = 2; 1559 else 1560 nterm = 1; 1561 1562 p = name; 1563 while (cp < ep && p < name + namelen) { 1564 i = 0; 1565 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1566 i++; 1567 /* result does not fit into mbuf */ 1568 if (cp + i + 1 >= ep) 1569 goto fail; 1570 /* 1571 * DNS label length restriction, RFC1035 page 8. 1572 * "i == 0" case is included here to avoid returning 1573 * 0-length label on "foo..bar". 1574 */ 1575 if (i <= 0 || i >= 64) 1576 goto fail; 1577 *cp++ = i; 1578 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1579 goto fail; 1580 while (i > 0) { 1581 if (!isalnum(*p) && *p != '-') 1582 goto fail; 1583 if (isupper(*p)) { 1584 *cp++ = tolower(*p); 1585 p++; 1586 } else 1587 *cp++ = *p++; 1588 i--; 1589 } 1590 p = q; 1591 if (p < name + namelen && *p == '.') 1592 p++; 1593 } 1594 /* termination */ 1595 if (cp + nterm >= ep) 1596 goto fail; 1597 while (nterm-- > 0) 1598 *cp++ = '\0'; 1599 m->m_len = cp - mtod(m, char *); 1600 return m; 1601 } 1602 1603 panic("should not reach here"); 1604 /* NOTREACHED */ 1605 1606 fail: 1607 if (m) 1608 m_freem(m); 1609 return NULL; 1610 } 1611 1612 /* 1613 * check if two DNS-encoded string matches. takes care of truncated 1614 * form (with \0\0 at the end). no compression support. 1615 * XXX upper/lowercase match (see RFC2065) 1616 */ 1617 static int 1618 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1619 { 1620 const char *a0, *b0; 1621 int l; 1622 1623 /* simplest case - need validation? */ 1624 if (alen == blen && memcmp(a, b, alen) == 0) 1625 return 1; 1626 1627 a0 = a; 1628 b0 = b; 1629 1630 /* termination is mandatory */ 1631 if (alen < 2 || blen < 2) 1632 return 0; 1633 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1634 return 0; 1635 alen--; 1636 blen--; 1637 1638 while (a - a0 < alen && b - b0 < blen) { 1639 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1640 return 0; 1641 1642 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1643 return 0; 1644 /* we don't support compression yet */ 1645 if (a[0] >= 64 || b[0] >= 64) 1646 return 0; 1647 1648 /* truncated case */ 1649 if (a[0] == 0 && a - a0 == alen - 1) 1650 return 1; 1651 if (b[0] == 0 && b - b0 == blen - 1) 1652 return 1; 1653 if (a[0] == 0 || b[0] == 0) 1654 return 0; 1655 1656 if (a[0] != b[0]) 1657 return 0; 1658 l = a[0]; 1659 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1660 return 0; 1661 if (memcmp(a + 1, b + 1, l) != 0) 1662 return 0; 1663 1664 a += 1 + l; 1665 b += 1 + l; 1666 } 1667 1668 if (a - a0 == alen && b - b0 == blen) 1669 return 1; 1670 else 1671 return 0; 1672 } 1673 1674 /* 1675 * calculate the number of addresses to be returned in the node info reply. 1676 */ 1677 static int 1678 ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj, 1679 struct psref *psref) 1680 { 1681 struct ifnet *ifp; 1682 struct in6_ifaddr *ia6; 1683 struct ifaddr *ifa; 1684 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1685 int addrs = 0, addrsofif, iffound = 0; 1686 int niflags = ni6->ni_flags; 1687 int s; 1688 1689 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1690 switch (ni6->ni_code) { 1691 case ICMP6_NI_SUBJ_IPV6: 1692 if (subj == NULL) /* must be impossible... */ 1693 return 0; 1694 subj_ip6 = (struct sockaddr_in6 *)subj; 1695 break; 1696 default: 1697 /* 1698 * XXX: we only support IPv6 subject address for 1699 * this Qtype. 1700 */ 1701 return 0; 1702 } 1703 } 1704 1705 s = pserialize_read_enter(); 1706 IFNET_READER_FOREACH(ifp) { 1707 addrsofif = 0; 1708 IFADDR_READER_FOREACH(ifa, ifp) { 1709 if (ifa->ifa_addr->sa_family != AF_INET6) 1710 continue; 1711 ia6 = (struct in6_ifaddr *)ifa; 1712 1713 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1714 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1715 &ia6->ia_addr.sin6_addr)) 1716 iffound = 1; 1717 1718 /* 1719 * IPv4-mapped addresses can only be returned by a 1720 * Node Information proxy, since they represent 1721 * addresses of IPv4-only nodes, which perforce do 1722 * not implement this protocol. 1723 * [icmp-name-lookups-07, Section 5.4] 1724 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1725 * this function at this moment. 1726 */ 1727 1728 /* What do we have to do about ::1? */ 1729 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1730 case IPV6_ADDR_SCOPE_LINKLOCAL: 1731 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1732 continue; 1733 break; 1734 case IPV6_ADDR_SCOPE_SITELOCAL: 1735 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1736 continue; 1737 break; 1738 case IPV6_ADDR_SCOPE_GLOBAL: 1739 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1740 continue; 1741 break; 1742 default: 1743 continue; 1744 } 1745 1746 /* 1747 * check if anycast is okay. 1748 * XXX: just experimental. not in the spec. 1749 */ 1750 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1751 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1752 continue; /* we need only unicast addresses */ 1753 1754 addrsofif++; /* count the address */ 1755 } 1756 if (iffound) { 1757 if_acquire(ifp, psref); 1758 pserialize_read_exit(s); 1759 *ifpp = ifp; 1760 return addrsofif; 1761 } 1762 1763 addrs += addrsofif; 1764 } 1765 pserialize_read_exit(s); 1766 1767 return addrs; 1768 } 1769 1770 static int 1771 ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1772 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1773 int resid) 1774 { 1775 struct ifnet *ifp; 1776 struct in6_ifaddr *ia6; 1777 struct ifaddr *ifa; 1778 struct ifnet *ifp_dep = NULL; 1779 int copied = 0, allow_deprecated = 0; 1780 u_char *cp = (u_char *)(nni6 + 1); 1781 int niflags = ni6->ni_flags; 1782 u_int32_t ltime; 1783 int s; 1784 1785 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1786 return 0; /* needless to copy */ 1787 1788 s = pserialize_read_enter(); 1789 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1790 again: 1791 1792 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1793 { 1794 IFADDR_READER_FOREACH(ifa, ifp) { 1795 if (ifa->ifa_addr->sa_family != AF_INET6) 1796 continue; 1797 ia6 = (struct in6_ifaddr *)ifa; 1798 1799 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1800 allow_deprecated == 0) { 1801 /* 1802 * prefererred address should be put before 1803 * deprecated addresses. 1804 */ 1805 1806 /* record the interface for later search */ 1807 if (ifp_dep == NULL) 1808 ifp_dep = ifp; 1809 1810 continue; 1811 } 1812 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1813 allow_deprecated != 0) 1814 continue; /* we now collect deprecated addrs */ 1815 1816 /* What do we have to do about ::1? */ 1817 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1818 case IPV6_ADDR_SCOPE_LINKLOCAL: 1819 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1820 continue; 1821 break; 1822 case IPV6_ADDR_SCOPE_SITELOCAL: 1823 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1824 continue; 1825 break; 1826 case IPV6_ADDR_SCOPE_GLOBAL: 1827 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1828 continue; 1829 break; 1830 default: 1831 continue; 1832 } 1833 1834 /* 1835 * check if anycast is okay. 1836 * XXX: just experimental. not in the spec. 1837 */ 1838 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1839 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1840 continue; 1841 1842 /* now we can copy the address */ 1843 if (resid < sizeof(struct in6_addr) + 1844 sizeof(u_int32_t)) { 1845 /* 1846 * We give up much more copy. 1847 * Set the truncate flag and return. 1848 */ 1849 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1850 goto out; 1851 } 1852 1853 /* 1854 * Set the TTL of the address. 1855 * The TTL value should be one of the following 1856 * according to the specification: 1857 * 1858 * 1. The remaining lifetime of a DHCP lease on the 1859 * address, or 1860 * 2. The remaining Valid Lifetime of a prefix from 1861 * which the address was derived through Stateless 1862 * Autoconfiguration. 1863 * 1864 * Note that we currently do not support stateful 1865 * address configuration by DHCPv6, so the former 1866 * case can't happen. 1867 * 1868 * TTL must be 2^31 > TTL >= 0. 1869 */ 1870 if (ia6->ia6_lifetime.ia6t_expire == 0) 1871 ltime = ND6_INFINITE_LIFETIME; 1872 else { 1873 if (ia6->ia6_lifetime.ia6t_expire > 1874 time_uptime) 1875 ltime = ia6->ia6_lifetime.ia6t_expire - 1876 time_uptime; 1877 else 1878 ltime = 0; 1879 } 1880 if (ltime > 0x7fffffff) 1881 ltime = 0x7fffffff; 1882 ltime = htonl(ltime); 1883 1884 memcpy(cp, <ime, sizeof(u_int32_t)); 1885 cp += sizeof(u_int32_t); 1886 1887 /* copy the address itself */ 1888 bcopy(&ia6->ia_addr.sin6_addr, cp, 1889 sizeof(struct in6_addr)); 1890 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1891 cp += sizeof(struct in6_addr); 1892 1893 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1894 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1895 } 1896 if (ifp0) /* we need search only on the specified IF */ 1897 break; 1898 } 1899 1900 if (allow_deprecated == 0 && ifp_dep != NULL) { 1901 ifp = ifp_dep; 1902 allow_deprecated = 1; 1903 1904 goto again; 1905 } 1906 out: 1907 pserialize_read_exit(s); 1908 return copied; 1909 } 1910 1911 /* 1912 * XXX almost dup'ed code with rip6_input. 1913 */ 1914 static int 1915 icmp6_rip6_input(struct mbuf **mp, int off) 1916 { 1917 struct mbuf *m = *mp; 1918 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1919 struct inpcb_hdr *inph; 1920 struct in6pcb *in6p; 1921 struct in6pcb *last = NULL; 1922 struct sockaddr_in6 rip6src; 1923 struct icmp6_hdr *icmp6; 1924 struct mbuf *n, *opts = NULL; 1925 1926 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1927 if (icmp6 == NULL) { 1928 /* m is already reclaimed */ 1929 return IPPROTO_DONE; 1930 } 1931 1932 /* 1933 * XXX: the address may have embedded scope zone ID, which should be 1934 * hidden from applications. 1935 */ 1936 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1937 if (sa6_recoverscope(&rip6src)) { 1938 m_freem(m); 1939 return IPPROTO_DONE; 1940 } 1941 1942 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1943 in6p = (struct in6pcb *)inph; 1944 if (in6p->in6p_af != AF_INET6) 1945 continue; 1946 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1947 continue; 1948 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1949 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1950 continue; 1951 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1952 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1953 continue; 1954 if (in6p->in6p_icmp6filt && 1955 ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1956 in6p->in6p_icmp6filt)) 1957 continue; 1958 1959 if (last == NULL) { 1960 ; 1961 } 1962 #ifdef IPSEC 1963 else if (ipsec_used && ipsec_in_reject(m, last)) { 1964 /* do not inject data into pcb */ 1965 } 1966 #endif 1967 else if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { 1968 if (last->in6p_flags & IN6P_CONTROLOPTS) 1969 ip6_savecontrol(last, &opts, ip6, n); 1970 /* strip intermediate headers */ 1971 m_adj(n, off); 1972 if (sbappendaddr(&last->in6p_socket->so_rcv, 1973 sin6tosa(&rip6src), n, opts) == 0) { 1974 soroverflow(last->in6p_socket); 1975 m_freem(n); 1976 if (opts) 1977 m_freem(opts); 1978 } else { 1979 sorwakeup(last->in6p_socket); 1980 } 1981 opts = NULL; 1982 } 1983 1984 last = in6p; 1985 } 1986 1987 #ifdef IPSEC 1988 if (ipsec_used && last && ipsec_in_reject(m, last)) { 1989 m_freem(m); 1990 IP6_STATDEC(IP6_STAT_DELIVERED); 1991 /* do not inject data into pcb */ 1992 } else 1993 #endif 1994 if (last) { 1995 if (last->in6p_flags & IN6P_CONTROLOPTS) 1996 ip6_savecontrol(last, &opts, ip6, m); 1997 /* strip intermediate headers */ 1998 m_adj(m, off); 1999 if (sbappendaddr(&last->in6p_socket->so_rcv, 2000 sin6tosa(&rip6src), m, opts) == 0) { 2001 soroverflow(last->in6p_socket); 2002 m_freem(m); 2003 if (opts) 2004 m_freem(opts); 2005 } else { 2006 sorwakeup(last->in6p_socket); 2007 } 2008 } else { 2009 m_freem(m); 2010 IP6_STATDEC(IP6_STAT_DELIVERED); 2011 } 2012 return IPPROTO_DONE; 2013 } 2014 2015 /* 2016 * Reflect the ip6 packet back to the source. 2017 * OFF points to the icmp6 header, counted from the top of the mbuf. 2018 * 2019 * Note: RFC 1885 required that an echo reply should be truncated if it 2020 * did not fit in with (return) path MTU, and KAME code supported the 2021 * behavior. However, as a clarification after the RFC, this limitation 2022 * was removed in a revised version of the spec, RFC 2463. We had kept the 2023 * old behavior, with a (non-default) ifdef block, while the new version of 2024 * the spec was an internet-draft status, and even after the new RFC was 2025 * published. But it would rather make sense to clean the obsoleted part 2026 * up, and to make the code simpler at this stage. 2027 */ 2028 static void 2029 icmp6_reflect(struct mbuf *m, size_t off) 2030 { 2031 struct ip6_hdr *ip6; 2032 struct icmp6_hdr *icmp6; 2033 const struct in6_ifaddr *ia; 2034 const struct ip6aux *ip6a; 2035 int plen; 2036 int type, code; 2037 struct ifnet *outif = NULL; 2038 struct in6_addr origdst; 2039 struct ifnet *rcvif; 2040 int s; 2041 bool ip6_src_filled = false; 2042 2043 /* too short to reflect */ 2044 if (off < sizeof(struct ip6_hdr)) { 2045 nd6log(LOG_DEBUG, 2046 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2047 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2048 __FILE__, __LINE__); 2049 goto bad; 2050 } 2051 2052 /* 2053 * If there are extra headers between IPv6 and ICMPv6, strip 2054 * off that header first. 2055 */ 2056 CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN); 2057 if (off > sizeof(struct ip6_hdr)) { 2058 size_t l; 2059 struct ip6_hdr nip6; 2060 2061 l = off - sizeof(struct ip6_hdr); 2062 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2063 m_adj(m, l); 2064 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2065 if (m->m_len < l) { 2066 if ((m = m_pullup(m, l)) == NULL) 2067 return; 2068 } 2069 memcpy(mtod(m, void *), (void *)&nip6, sizeof(nip6)); 2070 } else { 2071 size_t l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2072 if (m->m_len < l) { 2073 if ((m = m_pullup(m, l)) == NULL) 2074 return; 2075 } 2076 } 2077 2078 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2079 ip6 = mtod(m, struct ip6_hdr *); 2080 ip6->ip6_nxt = IPPROTO_ICMPV6; 2081 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2082 type = icmp6->icmp6_type; /* keep type for statistics */ 2083 code = icmp6->icmp6_code; /* ditto. */ 2084 2085 origdst = ip6->ip6_dst; 2086 /* 2087 * ip6_input() drops a packet if its src is multicast. 2088 * So, the src is never multicast. 2089 */ 2090 ip6->ip6_dst = ip6->ip6_src; 2091 2092 /* 2093 * If the incoming packet was addressed directly to us (i.e. unicast), 2094 * use dst as the src for the reply. 2095 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2096 * (for example) when we encounter an error while forwarding procedure 2097 * destined to a duplicated address of ours. 2098 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2099 * procedure of an outgoing packet of our own, in which case we need 2100 * to search in the ifaddr list. 2101 */ 2102 if (IN6_IS_ADDR_MULTICAST(&origdst)) { 2103 ; 2104 } else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2105 if ((ip6a->ip6a_flags & 2106 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2107 ip6->ip6_src = ip6a->ip6a_src; 2108 ip6_src_filled = true; 2109 } 2110 } else { 2111 union { 2112 struct sockaddr_in6 sin6; 2113 struct sockaddr sa; 2114 } u; 2115 int _s; 2116 struct ifaddr *ifa; 2117 2118 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2119 2120 _s = pserialize_read_enter(); 2121 ifa = ifa_ifwithaddr(&u.sa); 2122 2123 if (ifa != NULL) { 2124 ia = ifatoia6(ifa); 2125 if ((ia->ia6_flags & 2126 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2127 ip6->ip6_src = ia->ia_addr.sin6_addr; 2128 ip6_src_filled = true; 2129 } 2130 } 2131 pserialize_read_exit(_s); 2132 } 2133 2134 if (!ip6_src_filled) { 2135 int e; 2136 struct sockaddr_in6 sin6; 2137 struct route ro; 2138 2139 /* 2140 * This case matches to multicasts, our anycast, or unicasts 2141 * that we do not own. Select a source address based on the 2142 * source address of the erroneous packet. 2143 */ 2144 /* zone ID should be embedded */ 2145 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2146 2147 memset(&ro, 0, sizeof(ro)); 2148 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2149 &ip6->ip6_src); 2150 rtcache_free(&ro); 2151 if (e != 0) { 2152 char ip6buf[INET6_ADDRSTRLEN]; 2153 nd6log(LOG_DEBUG, 2154 "source can't be determined: " 2155 "dst=%s, error=%d\n", 2156 IN6_PRINT(ip6buf, &sin6.sin6_addr), e); 2157 goto bad; 2158 } 2159 } 2160 2161 ip6->ip6_flow = 0; 2162 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2163 ip6->ip6_vfc |= IPV6_VERSION; 2164 ip6->ip6_nxt = IPPROTO_ICMPV6; 2165 rcvif = m_get_rcvif(m, &s); 2166 if (rcvif) { 2167 /* XXX: This may not be the outgoing interface */ 2168 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2169 } else { 2170 ip6->ip6_hlim = ip6_defhlim; 2171 } 2172 m_put_rcvif(rcvif, &s); 2173 2174 m->m_pkthdr.csum_flags = 0; 2175 icmp6->icmp6_cksum = 0; 2176 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2177 sizeof(struct ip6_hdr), plen); 2178 2179 /* 2180 * XXX option handling 2181 */ 2182 2183 m->m_flags &= ~(M_BCAST|M_MCAST); 2184 2185 /* 2186 * To avoid a "too big" situation at an intermediate router 2187 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2188 * Note that only echo and node information replies are affected, 2189 * since the length of ICMP6 errors is limited to the minimum MTU. 2190 */ 2191 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) != 0 && 2192 outif) 2193 icmp6_ifstat_inc(outif, ifs6_out_error); 2194 if (outif) 2195 icmp6_ifoutstat_inc(outif, type, code); 2196 2197 return; 2198 2199 bad: 2200 m_freem(m); 2201 return; 2202 } 2203 2204 static const char * 2205 icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6, 2206 struct in6_addr *dst6, struct in6_addr *tgt6) 2207 { 2208 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 2209 char ip6buft[INET6_ADDRSTRLEN]; 2210 2211 snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)", 2212 IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6), 2213 IN6_PRINT(ip6buft, tgt6)); 2214 return buf; 2215 } 2216 2217 static void 2218 icmp6_redirect_input(struct mbuf *m, int off) 2219 { 2220 struct ifnet *ifp; 2221 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2222 struct nd_redirect *nd_rd; 2223 int icmp6len = m->m_pkthdr.len - off; 2224 char *lladdr = NULL; 2225 int lladdrlen = 0; 2226 struct rtentry *rt = NULL; 2227 int is_router; 2228 int is_onlink; 2229 struct in6_addr src6 = ip6->ip6_src; 2230 struct in6_addr redtgt6; 2231 struct in6_addr reddst6; 2232 union nd_opts ndopts; 2233 struct psref psref; 2234 char ip6buf[INET6_ADDRSTRLEN]; 2235 char diagbuf[256]; 2236 2237 ifp = m_get_rcvif_psref(m, &psref); 2238 if (ifp == NULL) 2239 goto freeit; 2240 2241 /* XXX if we are router, we don't update route by icmp6 redirect */ 2242 if (ip6_forwarding) 2243 goto freeit; 2244 if (!icmp6_rediraccept) 2245 goto freeit; 2246 2247 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2248 if (nd_rd == NULL) { 2249 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2250 m_put_rcvif_psref(ifp, &psref); 2251 return; 2252 } 2253 redtgt6 = nd_rd->nd_rd_target; 2254 reddst6 = nd_rd->nd_rd_dst; 2255 2256 if (in6_setscope(&redtgt6, ifp, NULL) || 2257 in6_setscope(&reddst6, ifp, NULL)) { 2258 goto freeit; 2259 } 2260 2261 /* validation */ 2262 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2263 nd6log(LOG_ERR, 2264 "ICMP6 redirect sent from %s rejected; " 2265 "must be from linklocal\n", IN6_PRINT(ip6buf, &src6)); 2266 goto bad; 2267 } 2268 if (ip6->ip6_hlim != 255) { 2269 nd6log(LOG_ERR, 2270 "ICMP6 redirect sent from %s rejected; " 2271 "hlim=%d (must be 255)\n", 2272 IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim); 2273 goto bad; 2274 } 2275 2276 { 2277 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2278 struct sockaddr_in6 sin6; 2279 struct in6_addr *gw6; 2280 2281 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2282 rt = rtalloc1(sin6tosa(&sin6), 0); 2283 if (rt) { 2284 if (rt->rt_gateway == NULL || 2285 rt->rt_gateway->sa_family != AF_INET6) { 2286 nd6log(LOG_ERR, 2287 "ICMP6 redirect rejected; no route " 2288 "with inet6 gateway found for redirect dst: %s\n", 2289 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2290 &src6, &reddst6, &redtgt6)); 2291 rt_unref(rt); 2292 goto bad; 2293 } 2294 2295 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2296 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2297 nd6log(LOG_ERR, 2298 "ICMP6 redirect rejected; " 2299 "not equal to gw-for-src=%s (must be same): %s\n", 2300 IN6_PRINT(ip6buf, gw6), 2301 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2302 &src6, &reddst6, &redtgt6)); 2303 rt_unref(rt); 2304 goto bad; 2305 } 2306 } else { 2307 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2308 "no route found for redirect dst: %s\n", 2309 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2310 &src6, &reddst6, &redtgt6)); 2311 goto bad; 2312 } 2313 rt_unref(rt); 2314 rt = NULL; 2315 } 2316 2317 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2318 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2319 "redirect dst must be unicast: %s\n", 2320 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2321 &src6, &reddst6, &redtgt6)); 2322 goto bad; 2323 } 2324 2325 is_router = is_onlink = 0; 2326 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2327 is_router = 1; /* router case */ 2328 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2329 is_onlink = 1; /* on-link destination case */ 2330 if (!is_router && !is_onlink) { 2331 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2332 "neither router case nor onlink case: %s\n", 2333 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2334 &src6, &reddst6, &redtgt6)); 2335 goto bad; 2336 } 2337 /* validation passed */ 2338 2339 icmp6len -= sizeof(*nd_rd); 2340 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2341 if (nd6_options(&ndopts) < 0) { 2342 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2343 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2344 &src6, &reddst6, &redtgt6)); 2345 /* nd6_options have incremented stats */ 2346 goto freeit; 2347 } 2348 2349 if (ndopts.nd_opts_tgt_lladdr) { 2350 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2351 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2352 } 2353 2354 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2355 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2356 "(if %d, icmp6 packet %d): %s\n", 2357 IN6_PRINT(ip6buf, &redtgt6), 2358 ifp->if_addrlen, lladdrlen - 2, 2359 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2360 &src6, &reddst6, &redtgt6)); 2361 goto bad; 2362 } 2363 2364 /* RFC 2461 8.3 */ 2365 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2366 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2367 2368 m_put_rcvif_psref(ifp, &psref); 2369 ifp = NULL; 2370 2371 if (!is_onlink) { /* better router case. perform rtredirect. */ 2372 /* perform rtredirect */ 2373 struct sockaddr_in6 sdst; 2374 struct sockaddr_in6 sgw; 2375 struct sockaddr_in6 ssrc; 2376 unsigned long rtcount; 2377 struct rtentry *newrt = NULL; 2378 2379 /* 2380 * do not install redirect route, if the number of entries 2381 * is too much (> hiwat). note that, the node (= host) will 2382 * work just fine even if we do not install redirect route 2383 * (there will be additional hops, though). 2384 */ 2385 mutex_enter(&icmp6_mtx); 2386 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2387 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) { 2388 mutex_exit(&icmp6_mtx); 2389 goto freeit; 2390 } 2391 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) { 2392 mutex_exit(&icmp6_mtx); 2393 goto freeit; 2394 } else if (0 <= icmp6_redirect_lowat && 2395 rtcount > icmp6_redirect_lowat) { 2396 /* 2397 * XXX nuke a victim, install the new one. 2398 */ 2399 } 2400 2401 memset(&sdst, 0, sizeof(sdst)); 2402 memset(&sgw, 0, sizeof(sgw)); 2403 memset(&ssrc, 0, sizeof(ssrc)); 2404 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2405 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2406 sizeof(struct sockaddr_in6); 2407 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2408 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2409 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2410 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2411 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), &newrt); 2412 2413 if (newrt) { 2414 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2415 icmp6_redirect_timeout_q); 2416 rt_unref(newrt); 2417 } 2418 mutex_exit(&icmp6_mtx); 2419 } 2420 /* finally update cached route in each socket via pfctlinput */ 2421 { 2422 struct sockaddr_in6 sdst; 2423 2424 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2425 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2426 #if defined(IPSEC) 2427 if (ipsec_used) 2428 key_sa_routechange(sin6tosa(&sdst)); 2429 #endif 2430 } 2431 2432 freeit: 2433 if (ifp != NULL) 2434 m_put_rcvif_psref(ifp, &psref); 2435 m_freem(m); 2436 return; 2437 2438 bad: 2439 m_put_rcvif_psref(ifp, &psref); 2440 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2441 m_freem(m); 2442 } 2443 2444 void 2445 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2446 { 2447 struct ifnet *ifp; /* my outgoing interface */ 2448 struct in6_addr *ifp_ll6; 2449 struct in6_addr *nexthop; 2450 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2451 struct mbuf *m = NULL; /* newly allocated one */ 2452 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2453 struct nd_redirect *nd_rd; 2454 size_t maxlen; 2455 u_char *p; 2456 struct sockaddr_in6 src_sa; 2457 2458 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2459 2460 /* if we are not router, we don't send icmp6 redirect */ 2461 if (!ip6_forwarding) 2462 goto fail; 2463 2464 /* sanity check */ 2465 KASSERT(m0 != NULL); 2466 KASSERT(rt != NULL); 2467 2468 ifp = rt->rt_ifp; 2469 2470 /* 2471 * Address check: 2472 * the source address must identify a neighbor, and 2473 * the destination address must not be a multicast address 2474 * [RFC 2461, sec 8.2] 2475 */ 2476 sip6 = mtod(m0, struct ip6_hdr *); 2477 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2478 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2479 goto fail; 2480 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2481 goto fail; /* what should we do here? */ 2482 2483 /* rate limit */ 2484 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2485 goto fail; 2486 2487 /* 2488 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2489 * we almost always ask for an mbuf cluster for simplicity. 2490 * (MHLEN < IPV6_MMTU is almost always true) 2491 */ 2492 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2493 if (m && IPV6_MMTU >= MHLEN) { 2494 #if IPV6_MMTU >= MCLBYTES 2495 MEXTMALLOC(m, IPV6_MMTU, M_NOWAIT); 2496 #else 2497 MCLGET(m, M_DONTWAIT); 2498 #endif 2499 } 2500 2501 if (!m) 2502 goto fail; 2503 m_reset_rcvif(m); 2504 m->m_len = 0; 2505 maxlen = M_TRAILINGSPACE(m); 2506 maxlen = min(IPV6_MMTU, maxlen); 2507 2508 /* just for safety */ 2509 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct nd_redirect) + 2510 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2511 goto fail; 2512 } 2513 2514 { 2515 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2516 struct in6_ifaddr *ia; 2517 int s = pserialize_read_enter(); 2518 if ((ia = in6ifa_ifpforlinklocal(ifp, 2519 IN6_IFF_NOTREADY| 2520 IN6_IFF_ANYCAST)) == NULL) { 2521 pserialize_read_exit(s); 2522 goto fail; 2523 } 2524 ifp_ll6 = &ia->ia_addr.sin6_addr; 2525 pserialize_read_exit(s); 2526 } 2527 2528 /* get ip6 linklocal address for the router. */ 2529 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2530 struct sockaddr_in6 *sin6; 2531 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2532 nexthop = &sin6->sin6_addr; 2533 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2534 nexthop = NULL; 2535 } else 2536 nexthop = NULL; 2537 2538 /* ip6 */ 2539 ip6 = mtod(m, struct ip6_hdr *); 2540 ip6->ip6_flow = 0; 2541 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2542 ip6->ip6_vfc |= IPV6_VERSION; 2543 /* ip6->ip6_plen will be set later */ 2544 ip6->ip6_nxt = IPPROTO_ICMPV6; 2545 ip6->ip6_hlim = 255; 2546 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2547 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2548 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2549 2550 /* ND Redirect */ 2551 nd_rd = (struct nd_redirect *)(ip6 + 1); 2552 nd_rd->nd_rd_type = ND_REDIRECT; 2553 nd_rd->nd_rd_code = 0; 2554 nd_rd->nd_rd_reserved = 0; 2555 if (rt->rt_flags & RTF_GATEWAY) { 2556 /* 2557 * nd_rd->nd_rd_target must be a link-local address in 2558 * better router cases. 2559 */ 2560 if (!nexthop) 2561 goto fail; 2562 bcopy(nexthop, &nd_rd->nd_rd_target, 2563 sizeof(nd_rd->nd_rd_target)); 2564 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2565 sizeof(nd_rd->nd_rd_dst)); 2566 } else { 2567 /* make sure redtgt == reddst */ 2568 nexthop = &sip6->ip6_dst; 2569 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2570 sizeof(nd_rd->nd_rd_target)); 2571 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2572 sizeof(nd_rd->nd_rd_dst)); 2573 } 2574 2575 p = (u_char *)(nd_rd + 1); 2576 2577 { 2578 /* target lladdr option */ 2579 struct llentry *ln = NULL; 2580 int len, pad; 2581 struct nd_opt_hdr *nd_opt; 2582 char *lladdr; 2583 2584 ln = nd6_lookup(nexthop, ifp, false); 2585 if (ln == NULL) 2586 goto nolladdropt; 2587 len = sizeof(*nd_opt) + ifp->if_addrlen; 2588 len = (len + 7) & ~7; /* round by 8 */ 2589 pad = len - (sizeof(*nd_opt) + ifp->if_addrlen); 2590 2591 /* safety check */ 2592 if (len + (p - (u_char *)ip6) > maxlen) { 2593 LLE_RUNLOCK(ln); 2594 goto nolladdropt; 2595 } 2596 2597 if (ln->la_flags & LLE_VALID) { 2598 nd_opt = (struct nd_opt_hdr *)p; 2599 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2600 nd_opt->nd_opt_len = len >> 3; 2601 lladdr = (char *)(nd_opt + 1); 2602 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2603 memset(lladdr + ifp->if_addrlen, 0, pad); 2604 p += len; 2605 } 2606 LLE_RUNLOCK(ln); 2607 } 2608 nolladdropt: 2609 2610 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2611 2612 /* just to be safe */ 2613 if (m0->m_flags & M_DECRYPTED) 2614 goto noredhdropt; 2615 if (p - (u_char *)ip6 > maxlen) 2616 goto noredhdropt; 2617 2618 { 2619 /* redirected header option */ 2620 int len; 2621 struct nd_opt_rd_hdr *nd_opt_rh; 2622 2623 /* 2624 * compute the maximum size for icmp6 redirect header option. 2625 * XXX room for auth header? 2626 */ 2627 len = maxlen - (p - (u_char *)ip6); 2628 len &= ~7; 2629 2630 if (len < sizeof(*nd_opt_rh)) { 2631 goto noredhdropt; 2632 } 2633 2634 /* 2635 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2636 * about padding/truncate rule for the original IP packet. 2637 * From the discussion on IPv6imp in Feb 1999, 2638 * the consensus was: 2639 * - "attach as much as possible" is the goal 2640 * - pad if not aligned (original size can be guessed by 2641 * original ip6 header) 2642 * Following code adds the padding if it is simple enough, 2643 * and truncates if not. 2644 */ 2645 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2646 /* not enough room, truncate */ 2647 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2648 m0->m_pkthdr.len); 2649 } else { 2650 /* 2651 * enough room, truncate if not aligned. 2652 * we don't pad here for simplicity. 2653 */ 2654 int extra; 2655 2656 extra = m0->m_pkthdr.len % 8; 2657 if (extra) { 2658 /* truncate */ 2659 m_adj(m0, -extra); 2660 } 2661 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2662 } 2663 2664 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2665 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2666 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2667 nd_opt_rh->nd_opt_rh_len = len >> 3; 2668 p += sizeof(*nd_opt_rh); 2669 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2670 2671 /* connect m0 to m */ 2672 m->m_pkthdr.len += m0->m_pkthdr.len; 2673 m_cat(m, m0); 2674 m0 = NULL; 2675 } 2676 noredhdropt: 2677 if (m0) { 2678 m_freem(m0); 2679 m0 = NULL; 2680 } 2681 2682 /* XXX: clear embedded link IDs in the inner header */ 2683 in6_clearscope(&sip6->ip6_src); 2684 in6_clearscope(&sip6->ip6_dst); 2685 in6_clearscope(&nd_rd->nd_rd_target); 2686 in6_clearscope(&nd_rd->nd_rd_dst); 2687 2688 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2689 2690 nd_rd->nd_rd_cksum = 0; 2691 nd_rd->nd_rd_cksum = 2692 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2693 2694 /* send the packet to outside... */ 2695 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2696 icmp6_ifstat_inc(ifp, ifs6_out_error); 2697 2698 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2699 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2700 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2701 2702 return; 2703 2704 fail: 2705 if (m) 2706 m_freem(m); 2707 if (m0) 2708 m_freem(m0); 2709 } 2710 2711 /* 2712 * ICMPv6 socket option processing. 2713 */ 2714 int 2715 icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2716 { 2717 int error = 0; 2718 struct in6pcb *in6p = sotoin6pcb(so); 2719 2720 if (sopt->sopt_level != IPPROTO_ICMPV6) 2721 return rip6_ctloutput(op, so, sopt); 2722 2723 switch (op) { 2724 case PRCO_SETOPT: 2725 switch (sopt->sopt_name) { 2726 case ICMP6_FILTER: 2727 { 2728 struct icmp6_filter fil; 2729 2730 error = sockopt_get(sopt, &fil, sizeof(fil)); 2731 if (error) 2732 break; 2733 memcpy(in6p->in6p_icmp6filt, &fil, 2734 sizeof(struct icmp6_filter)); 2735 error = 0; 2736 break; 2737 } 2738 2739 default: 2740 error = ENOPROTOOPT; 2741 break; 2742 } 2743 break; 2744 2745 case PRCO_GETOPT: 2746 switch (sopt->sopt_name) { 2747 case ICMP6_FILTER: 2748 { 2749 if (in6p->in6p_icmp6filt == NULL) { 2750 error = EINVAL; 2751 break; 2752 } 2753 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2754 sizeof(struct icmp6_filter)); 2755 break; 2756 } 2757 2758 default: 2759 error = ENOPROTOOPT; 2760 break; 2761 } 2762 break; 2763 } 2764 2765 return error; 2766 } 2767 2768 /* 2769 * Perform rate limit check. 2770 * Returns 0 if it is okay to send the icmp6 packet. 2771 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2772 * limitation. 2773 * 2774 * XXX per-destination/type check necessary? 2775 */ 2776 static int 2777 icmp6_ratelimit( 2778 const struct in6_addr *dst, /* not used at this moment */ 2779 const int type, /* not used at this moment */ 2780 const int code) /* not used at this moment */ 2781 { 2782 int ret; 2783 2784 ret = 0; /* okay to send */ 2785 2786 /* PPS limit */ 2787 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2788 icmp6errppslim)) { 2789 /* The packet is subject to rate limit */ 2790 ret++; 2791 } 2792 2793 return ret; 2794 } 2795 2796 static struct rtentry * 2797 icmp6_mtudisc_clone(struct sockaddr *dst) 2798 { 2799 struct rtentry *rt; 2800 int error; 2801 2802 rt = rtalloc1(dst, 1); 2803 if (rt == NULL) 2804 return NULL; 2805 2806 /* If we didn't get a host route, allocate one */ 2807 if ((rt->rt_flags & RTF_HOST) == 0) { 2808 struct rtentry *nrt; 2809 2810 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2811 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2812 if (error) { 2813 rt_unref(rt); 2814 return NULL; 2815 } 2816 nrt->rt_rmx = rt->rt_rmx; 2817 rt_unref(rt); 2818 rt = nrt; 2819 } 2820 2821 mutex_enter(&icmp6_mtx); 2822 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2823 icmp6_mtudisc_timeout_q); 2824 mutex_exit(&icmp6_mtx); 2825 2826 if (error) { 2827 rt_unref(rt); 2828 return NULL; 2829 } 2830 2831 return rt; /* caller need to call rtfree() */ 2832 } 2833 2834 static void 2835 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2836 { 2837 struct rtentry *retrt; 2838 2839 KASSERT(rt != NULL); 2840 rt_assert_referenced(rt); 2841 2842 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2843 (RTF_DYNAMIC | RTF_HOST)) { 2844 rtrequest(RTM_DELETE, rt_getkey(rt), 2845 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt); 2846 rt_unref(rt); 2847 rt_free(retrt); 2848 } else { 2849 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2850 rt->rt_rmx.rmx_mtu = 0; 2851 } 2852 } 2853 2854 static void 2855 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2856 { 2857 struct rtentry *retrt; 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 printf("%s: RTM_DELETE\n", __func__); 2865 rtrequest(RTM_DELETE, rt_getkey(rt), 2866 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt); 2867 rt_unref(rt); 2868 rt_free(retrt); 2869 } 2870 } 2871 2872 /* 2873 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2874 */ 2875 static int 2876 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2877 { 2878 (void)&name; 2879 (void)&l; 2880 (void)&oname; 2881 2882 if (namelen != 0) 2883 return (EINVAL); 2884 2885 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2886 /*XXXUNCONST*/ 2887 __UNCONST(newp), newlen)); 2888 } 2889 2890 static int 2891 sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2892 { 2893 2894 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2895 } 2896 2897 static int 2898 sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2899 { 2900 int error, tmp; 2901 struct sysctlnode node; 2902 2903 mutex_enter(&icmp6_mtx); 2904 2905 node = *rnode; 2906 node.sysctl_data = &tmp; 2907 tmp = icmp6_redirtimeout; 2908 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2909 if (error || newp == NULL) 2910 goto out; 2911 if (tmp < 0) { 2912 error = EINVAL; 2913 goto out; 2914 } 2915 icmp6_redirtimeout = tmp; 2916 2917 if (icmp6_redirect_timeout_q != NULL) { 2918 if (icmp6_redirtimeout == 0) { 2919 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2920 } else { 2921 rt_timer_queue_change(icmp6_redirect_timeout_q, 2922 icmp6_redirtimeout); 2923 } 2924 } else if (icmp6_redirtimeout > 0) { 2925 icmp6_redirect_timeout_q = 2926 rt_timer_queue_create(icmp6_redirtimeout); 2927 } 2928 error = 0; 2929 out: 2930 mutex_exit(&icmp6_mtx); 2931 return error; 2932 } 2933 2934 static void 2935 sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2936 { 2937 extern int nd6_maxqueuelen; /* defined in nd6.c */ 2938 2939 sysctl_createv(clog, 0, NULL, NULL, 2940 CTLFLAG_PERMANENT, 2941 CTLTYPE_NODE, "inet6", NULL, 2942 NULL, 0, NULL, 0, 2943 CTL_NET, PF_INET6, CTL_EOL); 2944 sysctl_createv(clog, 0, NULL, NULL, 2945 CTLFLAG_PERMANENT, 2946 CTLTYPE_NODE, "icmp6", 2947 SYSCTL_DESCR("ICMPv6 related settings"), 2948 NULL, 0, NULL, 0, 2949 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2950 2951 sysctl_createv(clog, 0, NULL, NULL, 2952 CTLFLAG_PERMANENT, 2953 CTLTYPE_STRUCT, "stats", 2954 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2955 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2956 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2957 ICMPV6CTL_STATS, CTL_EOL); 2958 sysctl_createv(clog, 0, NULL, NULL, 2959 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2960 CTLTYPE_INT, "rediraccept", 2961 SYSCTL_DESCR("Accept and process redirect messages"), 2962 NULL, 0, &icmp6_rediraccept, 0, 2963 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2964 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2965 sysctl_createv(clog, 0, NULL, NULL, 2966 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2967 CTLTYPE_INT, "redirtimeout", 2968 SYSCTL_DESCR("Redirect generated route lifetime"), 2969 sysctl_net_inet6_icmp6_redirtimeout, 0, 2970 &icmp6_redirtimeout, 0, 2971 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2972 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2973 #if 0 /* obsoleted */ 2974 sysctl_createv(clog, 0, NULL, NULL, 2975 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2976 CTLTYPE_INT, "errratelimit", NULL, 2977 NULL, 0, &icmp6_errratelimit, 0, 2978 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2979 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2980 #endif 2981 sysctl_createv(clog, 0, NULL, NULL, 2982 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2983 CTLTYPE_INT, "nd6_prune", 2984 SYSCTL_DESCR("Neighbor discovery prune interval"), 2985 NULL, 0, &nd6_prune, 0, 2986 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2987 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2988 sysctl_createv(clog, 0, NULL, NULL, 2989 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2990 CTLTYPE_INT, "nd6_delay", 2991 SYSCTL_DESCR("First probe delay time"), 2992 NULL, 0, &nd6_delay, 0, 2993 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2994 ICMPV6CTL_ND6_DELAY, CTL_EOL); 2995 sysctl_createv(clog, 0, NULL, NULL, 2996 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2997 CTLTYPE_INT, "nd6_umaxtries", 2998 SYSCTL_DESCR("Number of unicast discovery attempts"), 2999 NULL, 0, &nd6_umaxtries, 0, 3000 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3001 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 3002 sysctl_createv(clog, 0, NULL, NULL, 3003 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3004 CTLTYPE_INT, "nd6_mmaxtries", 3005 SYSCTL_DESCR("Number of multicast discovery attempts"), 3006 NULL, 0, &nd6_mmaxtries, 0, 3007 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3008 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 3009 sysctl_createv(clog, 0, NULL, NULL, 3010 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3011 CTLTYPE_INT, "nd6_useloopback", 3012 SYSCTL_DESCR("Use loopback interface for local traffic"), 3013 NULL, 0, &nd6_useloopback, 0, 3014 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3015 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 3016 #if 0 /* obsoleted */ 3017 sysctl_createv(clog, 0, NULL, NULL, 3018 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3019 CTLTYPE_INT, "nd6_proxyall", NULL, 3020 NULL, 0, &nd6_proxyall, 0, 3021 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3022 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 3023 #endif 3024 sysctl_createv(clog, 0, NULL, NULL, 3025 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3026 CTLTYPE_INT, "nodeinfo", 3027 SYSCTL_DESCR("Respond to node information requests"), 3028 NULL, 0, &icmp6_nodeinfo, 0, 3029 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3030 ICMPV6CTL_NODEINFO, CTL_EOL); 3031 sysctl_createv(clog, 0, NULL, NULL, 3032 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3033 CTLTYPE_INT, "errppslimit", 3034 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 3035 NULL, 0, &icmp6errppslim, 0, 3036 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3037 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 3038 sysctl_createv(clog, 0, NULL, NULL, 3039 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3040 CTLTYPE_INT, "nd6_maxnudhint", 3041 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 3042 NULL, 0, &nd6_maxnudhint, 0, 3043 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3044 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 3045 sysctl_createv(clog, 0, NULL, NULL, 3046 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3047 CTLTYPE_INT, "mtudisc_hiwat", 3048 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3049 NULL, 0, &icmp6_mtudisc_hiwat, 0, 3050 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3051 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 3052 sysctl_createv(clog, 0, NULL, NULL, 3053 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3054 CTLTYPE_INT, "mtudisc_lowat", 3055 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3056 NULL, 0, &icmp6_mtudisc_lowat, 0, 3057 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3058 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 3059 sysctl_createv(clog, 0, NULL, NULL, 3060 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3061 CTLTYPE_INT, "nd6_debug", 3062 SYSCTL_DESCR("Enable neighbor discovery debug output"), 3063 NULL, 0, &nd6_debug, 0, 3064 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3065 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 3066 sysctl_createv(clog, 0, NULL, NULL, 3067 CTLFLAG_PERMANENT, 3068 CTLTYPE_STRUCT, "nd6_drlist", 3069 SYSCTL_DESCR("Default router list"), 3070 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3071 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3072 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 3073 sysctl_createv(clog, 0, NULL, NULL, 3074 CTLFLAG_PERMANENT, 3075 CTLTYPE_STRUCT, "nd6_prlist", 3076 SYSCTL_DESCR("Prefix list"), 3077 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3078 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3079 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 3080 sysctl_createv(clog, 0, NULL, NULL, 3081 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3082 CTLTYPE_INT, "maxqueuelen", 3083 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3084 NULL, 1, &nd6_maxqueuelen, 0, 3085 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3086 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3087 } 3088 3089 void 3090 icmp6_statinc(u_int stat) 3091 { 3092 3093 KASSERT(stat < ICMP6_NSTATS); 3094 ICMP6_STATINC(stat); 3095 } 3096