icmp6.c revision 1.227
1/* $NetBSD: icmp6.c,v 1.227 2018/04/14 06:45:17 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 1.227 2018/04/14 06:45:17 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 119extern struct domain inet6domain; 120 121percpu_t *icmp6stat_percpu; 122 123extern struct inpcbtable raw6cbtable; 124extern int icmp6errppslim; 125static int icmp6errpps_count = 0; 126static struct timeval icmp6errppslim_last; 127extern int icmp6_nodeinfo; 128 129/* 130 * List of callbacks to notify when Path MTU changes are made. 131 */ 132struct icmp6_mtudisc_callback { 133 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 134 void (*mc_func)(struct in6_addr *); 135}; 136 137LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 138 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 139 140static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 141extern int pmtu_expire; 142 143/* XXX do these values make any sense? */ 144static int icmp6_mtudisc_hiwat = 1280; 145static int icmp6_mtudisc_lowat = 256; 146 147/* 148 * keep track of # of redirect routes. 149 */ 150static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 151 152/* XXX experimental, turned off */ 153static int icmp6_redirect_hiwat = -1; 154static int icmp6_redirect_lowat = -1; 155 156/* Protect mtudisc and redirect stuffs */ 157static kmutex_t icmp6_mtx __cacheline_aligned; 158 159static void icmp6_errcount(u_int, int, int); 160static int icmp6_rip6_input(struct mbuf **, int); 161static void icmp6_reflect(struct mbuf *, size_t); 162static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 163static const char *icmp6_redirect_diag(char *, size_t, struct in6_addr *, 164 struct in6_addr *, struct in6_addr *); 165static void icmp6_redirect_input(struct mbuf *, int); 166static struct mbuf *ni6_input(struct mbuf *, int); 167static struct mbuf *ni6_nametodns(const char *, int, int); 168static int ni6_dnsmatch(const char *, int, const char *, int); 169static int ni6_addrs(struct icmp6_nodeinfo *, struct ifnet **, char *, 170 struct psref *); 171static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 172 struct ifnet *, int); 173static int icmp6_notify_error(struct mbuf *, int, int, int); 174static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 175static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 176static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 177static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 178 179/* workqueue-based pr_input */ 180static struct wqinput *icmp6_wqinput; 181static void _icmp6_input(struct mbuf *m, int off, int proto); 182 183void 184icmp6_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 201static void 202icmp6_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 */ 263void 264icmp6_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 */ 289void 290icmp6_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 313out: 314 m_freem(m); 315} 316 317/* 318 * Generate an error packet of type error in response to bad IP6 packet. 319 */ 320void 321icmp6_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 453freeit: 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 */ 463static 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 920freeit: 921 m_put_rcvif_psref(rcvif, &psref); 922 m_freem(m); 923 return; 924} 925 926int 927icmp6_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 935static int 936icmp6_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 ip6_rthdr0 *rth0; 967 int rthlen; 968 struct ifnet *rcvif; 969 int s; 970 971 while (1) { /* XXX: should avoid infinite loop explicitly? */ 972 struct ip6_ext *eh; 973 974 switch (nxt) { 975 case IPPROTO_HOPOPTS: 976 case IPPROTO_DSTOPTS: 977 case IPPROTO_AH: 978 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 979 eoff, sizeof(*eh)); 980 if (eh == NULL) { 981 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 982 return (-1); 983 } 984 985 if (nxt == IPPROTO_AH) 986 eoff += (eh->ip6e_len + 2) << 2; 987 else 988 eoff += (eh->ip6e_len + 1) << 3; 989 nxt = eh->ip6e_nxt; 990 break; 991 case IPPROTO_ROUTING: 992 /* 993 * When the erroneous packet contains a 994 * routing header, we should examine the 995 * header to determine the final destination. 996 * Otherwise, we can't properly update 997 * information that depends on the final 998 * destination (e.g. path MTU). 999 */ 1000 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 1001 eoff, sizeof(*rth)); 1002 if (rth == NULL) { 1003 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1004 return (-1); 1005 } 1006 rthlen = (rth->ip6r_len + 1) << 3; 1007 /* 1008 * XXX: currently there is no 1009 * officially defined type other 1010 * than type-0. 1011 * Note that if the segment left field 1012 * is 0, all intermediate hops must 1013 * have been passed. 1014 */ 1015 if (rth->ip6r_segleft && 1016 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 1017 int hops; 1018 1019 IP6_EXTHDR_GET(rth0, 1020 struct ip6_rthdr0 *, m, 1021 eoff, rthlen); 1022 if (rth0 == NULL) { 1023 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1024 return (-1); 1025 } 1026 /* just ignore a bogus header */ 1027 if ((rth0->ip6r0_len % 2) == 0 && 1028 (hops = rth0->ip6r0_len/2)) 1029 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 1030 } 1031 eoff += rthlen; 1032 nxt = rth->ip6r_nxt; 1033 break; 1034 case IPPROTO_FRAGMENT: 1035 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1036 eoff, sizeof(*fh)); 1037 if (fh == NULL) { 1038 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1039 return (-1); 1040 } 1041 /* 1042 * Data after a fragment header is meaningless 1043 * unless it is the first fragment, but 1044 * we'll go to the notify label for path MTU 1045 * discovery. 1046 */ 1047 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1048 goto notify; 1049 1050 eoff += sizeof(struct ip6_frag); 1051 nxt = fh->ip6f_nxt; 1052 break; 1053 default: 1054 /* 1055 * This case includes ESP and the No Next 1056 * Header. In such cases going to the notify 1057 * label does not have any meaning 1058 * (i.e. ctlfunc will be NULL), but we go 1059 * anyway since we might have to update 1060 * path MTU information. 1061 */ 1062 goto notify; 1063 } 1064 } 1065 notify: 1066 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1067 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1068 if (icmp6 == NULL) { 1069 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1070 return (-1); 1071 } 1072 1073 /* 1074 * retrieve parameters from the inner IPv6 header, and convert 1075 * them into sockaddr structures. 1076 * XXX: there is no guarantee that the source or destination 1077 * addresses of the inner packet are in the same scope zone as 1078 * the addresses of the icmp packet. But there is no other 1079 * way to determine the zone. 1080 */ 1081 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1082 1083 rcvif = m_get_rcvif(m, &s); 1084 if (__predict_false(rcvif == NULL)) 1085 goto freeit; 1086 sockaddr_in6_init(&icmp6dst, 1087 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1088 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1089 m_put_rcvif(rcvif, &s); 1090 goto freeit; 1091 } 1092 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1093 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1094 m_put_rcvif(rcvif, &s); 1095 goto freeit; 1096 } 1097 m_put_rcvif(rcvif, &s); 1098 1099 icmp6src.sin6_flowinfo = 1100 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1101 1102 if (finaldst == NULL) 1103 finaldst = &eip6->ip6_dst; 1104 ip6cp.ip6c_m = m; 1105 ip6cp.ip6c_icmp6 = icmp6; 1106 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1107 ip6cp.ip6c_off = eoff; 1108 ip6cp.ip6c_finaldst = finaldst; 1109 ip6cp.ip6c_src = &icmp6src; 1110 ip6cp.ip6c_nxt = nxt; 1111 1112 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1113 notifymtu = ntohl(icmp6->icmp6_mtu); 1114 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1115 } 1116 1117 ctlfunc = (void (*)(int, struct sockaddr *, void *)) 1118 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1119 if (ctlfunc) { 1120 (void)(*ctlfunc)(code, sin6tosa(&icmp6dst), &ip6cp); 1121 } 1122 } 1123 return (0); 1124 1125freeit: 1126 m_freem(m); 1127 return (-1); 1128} 1129 1130void 1131icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1132{ 1133 unsigned long rtcount; 1134 struct icmp6_mtudisc_callback *mc; 1135 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1136 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1137 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1138 u_int mtu = ntohl(icmp6->icmp6_mtu); 1139 struct rtentry *rt = NULL; 1140 struct sockaddr_in6 sin6; 1141 struct ifnet *rcvif; 1142 int s; 1143 1144 /* 1145 * The MTU should not be less than the minimal IPv6 MTU except for the 1146 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1147 * In that one case, the MTU might be less than 1280. 1148 */ 1149 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1150 /* is the mtu even sane? */ 1151 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1152 return; 1153 if (!validated) 1154 return; 1155 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1156 } 1157 1158 /* 1159 * allow non-validated cases if memory is plenty, to make traffic 1160 * from non-connected pcb happy. 1161 */ 1162 mutex_enter(&icmp6_mtx); 1163 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1164 if (validated) { 1165 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) { 1166 mutex_exit(&icmp6_mtx); 1167 return; 1168 } else if (0 <= icmp6_mtudisc_lowat && 1169 rtcount > icmp6_mtudisc_lowat) { 1170 /* 1171 * XXX nuke a victim, install the new one. 1172 */ 1173 } 1174 } else { 1175 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) { 1176 mutex_exit(&icmp6_mtx); 1177 return; 1178 } 1179 } 1180 mutex_exit(&icmp6_mtx); 1181 1182 memset(&sin6, 0, sizeof(sin6)); 1183 sin6.sin6_family = PF_INET6; 1184 sin6.sin6_len = sizeof(struct sockaddr_in6); 1185 sin6.sin6_addr = *dst; 1186 rcvif = m_get_rcvif(m, &s); 1187 if (__predict_false(rcvif == NULL)) 1188 return; 1189 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1190 m_put_rcvif(rcvif, &s); 1191 return; 1192 } 1193 m_put_rcvif(rcvif, &s); 1194 1195 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1196 1197 if (rt && (rt->rt_flags & RTF_HOST) && 1198 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1199 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1200 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1201 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1202 rt->rt_rmx.rmx_mtu = mtu; 1203 } 1204 } 1205 if (rt) { 1206 rt_unref(rt); 1207 } 1208 1209 /* 1210 * Notify protocols that the MTU for this destination 1211 * has changed. 1212 */ 1213 mutex_enter(&icmp6_mtx); 1214 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1215 mc = LIST_NEXT(mc, mc_list)) 1216 (*mc->mc_func)(&sin6.sin6_addr); 1217 mutex_exit(&icmp6_mtx); 1218} 1219 1220/* 1221 * Process a Node Information Query packet, based on 1222 * draft-ietf-ipngwg-icmp-name-lookups-07. 1223 * 1224 * Spec incompatibilities: 1225 * - IPv6 Subject address handling 1226 * - IPv4 Subject address handling support missing 1227 * - Proxy reply (answer even if it's not for me) 1228 * - joins NI group address at in6_ifattach() time only, does not cope 1229 * with hostname changes by sethostname(3) 1230 */ 1231static struct mbuf * 1232ni6_input(struct mbuf *m, int off) 1233{ 1234 struct icmp6_nodeinfo *ni6, *nni6; 1235 struct mbuf *n = NULL; 1236 u_int16_t qtype; 1237 int subjlen; 1238 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1239 struct ni_reply_fqdn *fqdn; 1240 int addrs; /* for NI_QTYPE_NODEADDR */ 1241 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1242 struct sockaddr_in6 sin6; /* ip6_dst */ 1243 struct in6_addr in6_subj; /* subject address */ 1244 struct ip6_hdr *ip6; 1245 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1246 char *subj = NULL; 1247 struct ifnet *rcvif; 1248 int s, ss; 1249 struct ifaddr *ifa; 1250 struct psref psref; 1251 1252 ip6 = mtod(m, struct ip6_hdr *); 1253 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1254 if (ni6 == NULL) { 1255 /* m is already reclaimed */ 1256 return NULL; 1257 } 1258 KASSERT((m->m_flags & M_PKTHDR) != 0); 1259 1260 /* 1261 * Validate IPv6 destination address. 1262 * 1263 * The Responder must discard the Query without further processing 1264 * unless it is one of the Responder's unicast or anycast addresses, or 1265 * a link-local scope multicast address which the Responder has joined. 1266 * [icmp-name-lookups-07, Section 4.] 1267 */ 1268 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1269 /* XXX scopeid */ 1270 ss = pserialize_read_enter(); 1271 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1272 if (ifa != NULL) 1273 ; /* unicast/anycast, fine */ 1274 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1275 ; /* link-local multicast, fine */ 1276 else { 1277 pserialize_read_exit(ss); 1278 goto bad; 1279 } 1280 pserialize_read_exit(ss); 1281 1282 /* validate query Subject field. */ 1283 qtype = ntohs(ni6->ni_qtype); 1284 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1285 switch (qtype) { 1286 case NI_QTYPE_NOOP: 1287 case NI_QTYPE_SUPTYPES: 1288 /* 07 draft */ 1289 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1290 break; 1291 /* FALLTHROUGH */ 1292 case NI_QTYPE_FQDN: 1293 case NI_QTYPE_NODEADDR: 1294 case NI_QTYPE_IPV4ADDR: 1295 switch (ni6->ni_code) { 1296 case ICMP6_NI_SUBJ_IPV6: 1297#if ICMP6_NI_SUBJ_IPV6 != 0 1298 case 0: 1299#endif 1300 /* 1301 * backward compatibility - try to accept 03 draft 1302 * format, where no Subject is present. 1303 */ 1304 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1305 subjlen == 0) { 1306 oldfqdn++; 1307 break; 1308 } 1309#if ICMP6_NI_SUBJ_IPV6 != 0 1310 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1311 goto bad; 1312#endif 1313 1314 if (subjlen != sizeof(sin6.sin6_addr)) 1315 goto bad; 1316 1317 /* 1318 * Validate Subject address. 1319 * 1320 * Not sure what exactly "address belongs to the node" 1321 * means in the spec, is it just unicast, or what? 1322 * 1323 * At this moment we consider Subject address as 1324 * "belong to the node" if the Subject address equals 1325 * to the IPv6 destination address; validation for 1326 * IPv6 destination address should have done enough 1327 * check for us. 1328 * 1329 * We do not do proxy at this moment. 1330 */ 1331 /* m_pulldown instead of copy? */ 1332 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1333 subjlen, (void *)&in6_subj); 1334 rcvif = m_get_rcvif(m, &s); 1335 if (__predict_false(rcvif == NULL)) 1336 goto bad; 1337 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1338 m_put_rcvif(rcvif, &s); 1339 goto bad; 1340 } 1341 m_put_rcvif(rcvif, &s); 1342 1343 subj = (char *)&in6_subj; 1344 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1345 break; 1346 1347 /* 1348 * XXX if we are to allow other cases, we should really 1349 * be careful about scope here. 1350 * basically, we should disallow queries toward IPv6 1351 * destination X with subject Y, if scope(X) > scope(Y). 1352 * if we allow scope(X) > scope(Y), it will result in 1353 * information leakage across scope boundary. 1354 */ 1355 goto bad; 1356 1357 case ICMP6_NI_SUBJ_FQDN: 1358 /* 1359 * Validate Subject name with gethostname(3). 1360 * 1361 * The behavior may need some debate, since: 1362 * - we are not sure if the node has FQDN as 1363 * hostname (returned by gethostname(3)). 1364 * - the code does wildcard match for truncated names. 1365 * however, we are not sure if we want to perform 1366 * wildcard match, if gethostname(3) side has 1367 * truncated hostname. 1368 */ 1369 n = ni6_nametodns(hostname, hostnamelen, 0); 1370 if (!n || n->m_next || n->m_len == 0) 1371 goto bad; 1372 IP6_EXTHDR_GET(subj, char *, m, 1373 off + sizeof(struct icmp6_nodeinfo), subjlen); 1374 if (subj == NULL) 1375 goto bad; 1376 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1377 n->m_len)) { 1378 goto bad; 1379 } 1380 m_freem(n); 1381 n = NULL; 1382 break; 1383 1384 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1385 default: 1386 goto bad; 1387 } 1388 break; 1389 } 1390 1391 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1392 switch (qtype) { 1393 case NI_QTYPE_FQDN: 1394 if ((icmp6_nodeinfo & 1) == 0) 1395 goto bad; 1396 break; 1397 case NI_QTYPE_NODEADDR: 1398 case NI_QTYPE_IPV4ADDR: 1399 if ((icmp6_nodeinfo & 2) == 0) 1400 goto bad; 1401 break; 1402 } 1403 1404 /* guess reply length */ 1405 switch (qtype) { 1406 case NI_QTYPE_NOOP: 1407 break; /* no reply data */ 1408 case NI_QTYPE_SUPTYPES: 1409 replylen += sizeof(u_int32_t); 1410 break; 1411 case NI_QTYPE_FQDN: 1412 /* will append an mbuf */ 1413 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1414 break; 1415 case NI_QTYPE_NODEADDR: 1416 addrs = ni6_addrs(ni6, &ifp, subj, &psref); 1417 replylen += addrs * 1418 (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1419 if (replylen > MCLBYTES) 1420 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1421 break; 1422 case NI_QTYPE_IPV4ADDR: 1423 /* unsupported - should respond with unknown Qtype? */ 1424 goto bad; 1425 default: 1426 /* 1427 * XXX: We must return a reply with the ICMP6 code 1428 * `unknown Qtype' in this case. However we regard the case 1429 * as an FQDN query for backward compatibility. 1430 * Older versions set a random value to this field, 1431 * so it rarely varies in the defined qtypes. 1432 * But the mechanism is not reliable... 1433 * maybe we should obsolete older versions. 1434 */ 1435 qtype = NI_QTYPE_FQDN; 1436 /* will append an mbuf */ 1437 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1438 oldfqdn++; 1439 break; 1440 } 1441 1442 /* allocate an mbuf to reply. */ 1443 MGETHDR(n, M_DONTWAIT, m->m_type); 1444 if (n == NULL) { 1445 goto bad; 1446 } 1447 M_MOVE_PKTHDR(n, m); /* just for rcvif */ 1448 if (replylen > MHLEN) { 1449 if (replylen > MCLBYTES) { 1450 /* 1451 * XXX: should we try to allocate more? But MCLBYTES 1452 * is probably much larger than IPV6_MMTU... 1453 */ 1454 goto bad; 1455 } 1456 MCLGET(n, M_DONTWAIT); 1457 if ((n->m_flags & M_EXT) == 0) { 1458 goto bad; 1459 } 1460 } 1461 n->m_pkthdr.len = n->m_len = replylen; 1462 1463 /* copy mbuf header and IPv6 + Node Information base headers */ 1464 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1465 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1466 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1467 1468 /* qtype dependent procedure */ 1469 switch (qtype) { 1470 case NI_QTYPE_NOOP: 1471 nni6->ni_code = ICMP6_NI_SUCCESS; 1472 nni6->ni_flags = 0; 1473 break; 1474 case NI_QTYPE_SUPTYPES: 1475 { 1476 u_int32_t v; 1477 nni6->ni_code = ICMP6_NI_SUCCESS; 1478 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1479 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1480 v = (u_int32_t)htonl(0x0000000f); 1481 memcpy(nni6 + 1, &v, sizeof(u_int32_t)); 1482 break; 1483 } 1484 case NI_QTYPE_FQDN: 1485 nni6->ni_code = ICMP6_NI_SUCCESS; 1486 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1487 sizeof(struct ip6_hdr) + 1488 sizeof(struct icmp6_nodeinfo)); 1489 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1490 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1491 /* 1492 * XXX do we really have FQDN in variable "hostname"? 1493 */ 1494 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1495 if (n->m_next == NULL) 1496 goto bad; 1497 /* XXX we assume that n->m_next is not a chain */ 1498 if (n->m_next->m_next != NULL) 1499 goto bad; 1500 n->m_pkthdr.len += n->m_next->m_len; 1501 break; 1502 case NI_QTYPE_NODEADDR: 1503 { 1504 int lenlim, copied; 1505 1506 nni6->ni_code = ICMP6_NI_SUCCESS; 1507 n->m_pkthdr.len = n->m_len = 1508 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1509 lenlim = M_TRAILINGSPACE(n); 1510 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1511 if_put(ifp, &psref); 1512 ifp = NULL; 1513 /* XXX: reset mbuf length */ 1514 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1515 sizeof(struct icmp6_nodeinfo) + copied; 1516 break; 1517 } 1518 default: 1519 panic("%s: impossible", __func__); 1520 break; 1521 } 1522 1523 nni6->ni_type = ICMP6_NI_REPLY; 1524 m_freem(m); 1525 return n; 1526 1527bad: 1528 if_put(ifp, &psref); 1529 m_freem(m); 1530 if (n) 1531 m_freem(n); 1532 return NULL; 1533} 1534 1535#define isupper(x) ('A' <= (x) && (x) <= 'Z') 1536#define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1537#define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1538#define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1539 1540/* 1541 * make a mbuf with DNS-encoded string. no compression support. 1542 * 1543 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1544 * treated as truncated name (two \0 at the end). this is a wild guess. 1545 * 1546 * old - return pascal string if non-zero 1547 */ 1548static struct mbuf * 1549ni6_nametodns(const char *name, int namelen, int old) 1550{ 1551 struct mbuf *m; 1552 char *cp, *ep; 1553 const char *p, *q; 1554 int i, len, nterm; 1555 1556 if (old) 1557 len = namelen + 1; 1558 else 1559 len = MCLBYTES; 1560 1561 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1562 MGET(m, M_DONTWAIT, MT_DATA); 1563 if (m && len > MLEN) { 1564 MCLGET(m, M_DONTWAIT); 1565 if ((m->m_flags & M_EXT) == 0) 1566 goto fail; 1567 } 1568 if (!m) 1569 goto fail; 1570 m->m_next = NULL; 1571 1572 if (old) { 1573 m->m_len = len; 1574 *mtod(m, char *) = namelen; 1575 memcpy(mtod(m, char *) + 1, name, namelen); 1576 return m; 1577 } else { 1578 m->m_len = 0; 1579 cp = mtod(m, char *); 1580 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1581 1582 /* if not certain about my name, return empty buffer */ 1583 if (namelen == 0) 1584 return m; 1585 1586 /* 1587 * guess if it looks like shortened hostname, or FQDN. 1588 * shortened hostname needs two trailing "\0". 1589 */ 1590 i = 0; 1591 for (p = name; p < name + namelen; p++) { 1592 if (*p == '.') 1593 i++; 1594 } 1595 if (i < 2) 1596 nterm = 2; 1597 else 1598 nterm = 1; 1599 1600 p = name; 1601 while (cp < ep && p < name + namelen) { 1602 i = 0; 1603 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1604 i++; 1605 /* result does not fit into mbuf */ 1606 if (cp + i + 1 >= ep) 1607 goto fail; 1608 /* 1609 * DNS label length restriction, RFC1035 page 8. 1610 * "i == 0" case is included here to avoid returning 1611 * 0-length label on "foo..bar". 1612 */ 1613 if (i <= 0 || i >= 64) 1614 goto fail; 1615 *cp++ = i; 1616 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1617 goto fail; 1618 while (i > 0) { 1619 if (!isalnum(*p) && *p != '-') 1620 goto fail; 1621 if (isupper(*p)) { 1622 *cp++ = tolower(*p); 1623 p++; 1624 } else 1625 *cp++ = *p++; 1626 i--; 1627 } 1628 p = q; 1629 if (p < name + namelen && *p == '.') 1630 p++; 1631 } 1632 /* termination */ 1633 if (cp + nterm >= ep) 1634 goto fail; 1635 while (nterm-- > 0) 1636 *cp++ = '\0'; 1637 m->m_len = cp - mtod(m, char *); 1638 return m; 1639 } 1640 1641 panic("should not reach here"); 1642 /* NOTREACHED */ 1643 1644fail: 1645 if (m) 1646 m_freem(m); 1647 return NULL; 1648} 1649 1650/* 1651 * check if two DNS-encoded string matches. takes care of truncated 1652 * form (with \0\0 at the end). no compression support. 1653 * XXX upper/lowercase match (see RFC2065) 1654 */ 1655static int 1656ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1657{ 1658 const char *a0, *b0; 1659 int l; 1660 1661 /* simplest case - need validation? */ 1662 if (alen == blen && memcmp(a, b, alen) == 0) 1663 return 1; 1664 1665 a0 = a; 1666 b0 = b; 1667 1668 /* termination is mandatory */ 1669 if (alen < 2 || blen < 2) 1670 return 0; 1671 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1672 return 0; 1673 alen--; 1674 blen--; 1675 1676 while (a - a0 < alen && b - b0 < blen) { 1677 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1678 return 0; 1679 1680 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1681 return 0; 1682 /* we don't support compression yet */ 1683 if (a[0] >= 64 || b[0] >= 64) 1684 return 0; 1685 1686 /* truncated case */ 1687 if (a[0] == 0 && a - a0 == alen - 1) 1688 return 1; 1689 if (b[0] == 0 && b - b0 == blen - 1) 1690 return 1; 1691 if (a[0] == 0 || b[0] == 0) 1692 return 0; 1693 1694 if (a[0] != b[0]) 1695 return 0; 1696 l = a[0]; 1697 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1698 return 0; 1699 if (memcmp(a + 1, b + 1, l) != 0) 1700 return 0; 1701 1702 a += 1 + l; 1703 b += 1 + l; 1704 } 1705 1706 if (a - a0 == alen && b - b0 == blen) 1707 return 1; 1708 else 1709 return 0; 1710} 1711 1712/* 1713 * calculate the number of addresses to be returned in the node info reply. 1714 */ 1715static int 1716ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj, 1717 struct psref *psref) 1718{ 1719 struct ifnet *ifp; 1720 struct in6_ifaddr *ia6; 1721 struct ifaddr *ifa; 1722 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1723 int addrs = 0, addrsofif, iffound = 0; 1724 int niflags = ni6->ni_flags; 1725 int s; 1726 1727 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1728 switch (ni6->ni_code) { 1729 case ICMP6_NI_SUBJ_IPV6: 1730 if (subj == NULL) /* must be impossible... */ 1731 return (0); 1732 subj_ip6 = (struct sockaddr_in6 *)subj; 1733 break; 1734 default: 1735 /* 1736 * XXX: we only support IPv6 subject address for 1737 * this Qtype. 1738 */ 1739 return (0); 1740 } 1741 } 1742 1743 s = pserialize_read_enter(); 1744 IFNET_READER_FOREACH(ifp) { 1745 addrsofif = 0; 1746 IFADDR_READER_FOREACH(ifa, ifp) { 1747 if (ifa->ifa_addr->sa_family != AF_INET6) 1748 continue; 1749 ia6 = (struct in6_ifaddr *)ifa; 1750 1751 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1752 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1753 &ia6->ia_addr.sin6_addr)) 1754 iffound = 1; 1755 1756 /* 1757 * IPv4-mapped addresses can only be returned by a 1758 * Node Information proxy, since they represent 1759 * addresses of IPv4-only nodes, which perforce do 1760 * not implement this protocol. 1761 * [icmp-name-lookups-07, Section 5.4] 1762 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1763 * this function at this moment. 1764 */ 1765 1766 /* What do we have to do about ::1? */ 1767 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1768 case IPV6_ADDR_SCOPE_LINKLOCAL: 1769 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1770 continue; 1771 break; 1772 case IPV6_ADDR_SCOPE_SITELOCAL: 1773 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1774 continue; 1775 break; 1776 case IPV6_ADDR_SCOPE_GLOBAL: 1777 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1778 continue; 1779 break; 1780 default: 1781 continue; 1782 } 1783 1784 /* 1785 * check if anycast is okay. 1786 * XXX: just experimental. not in the spec. 1787 */ 1788 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1789 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1790 continue; /* we need only unicast addresses */ 1791 1792 addrsofif++; /* count the address */ 1793 } 1794 if (iffound) { 1795 if_acquire(ifp, psref); 1796 pserialize_read_exit(s); 1797 *ifpp = ifp; 1798 return (addrsofif); 1799 } 1800 1801 addrs += addrsofif; 1802 } 1803 pserialize_read_exit(s); 1804 1805 return (addrs); 1806} 1807 1808static int 1809ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1810 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1811 int resid) 1812{ 1813 struct ifnet *ifp; 1814 struct in6_ifaddr *ia6; 1815 struct ifaddr *ifa; 1816 struct ifnet *ifp_dep = NULL; 1817 int copied = 0, allow_deprecated = 0; 1818 u_char *cp = (u_char *)(nni6 + 1); 1819 int niflags = ni6->ni_flags; 1820 u_int32_t ltime; 1821 int s; 1822 1823 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1824 return (0); /* needless to copy */ 1825 1826 s = pserialize_read_enter(); 1827 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1828again: 1829 1830 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1831 { 1832 IFADDR_READER_FOREACH(ifa, ifp) { 1833 if (ifa->ifa_addr->sa_family != AF_INET6) 1834 continue; 1835 ia6 = (struct in6_ifaddr *)ifa; 1836 1837 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1838 allow_deprecated == 0) { 1839 /* 1840 * prefererred address should be put before 1841 * deprecated addresses. 1842 */ 1843 1844 /* record the interface for later search */ 1845 if (ifp_dep == NULL) 1846 ifp_dep = ifp; 1847 1848 continue; 1849 } 1850 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1851 allow_deprecated != 0) 1852 continue; /* we now collect deprecated addrs */ 1853 1854 /* What do we have to do about ::1? */ 1855 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1856 case IPV6_ADDR_SCOPE_LINKLOCAL: 1857 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1858 continue; 1859 break; 1860 case IPV6_ADDR_SCOPE_SITELOCAL: 1861 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1862 continue; 1863 break; 1864 case IPV6_ADDR_SCOPE_GLOBAL: 1865 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1866 continue; 1867 break; 1868 default: 1869 continue; 1870 } 1871 1872 /* 1873 * check if anycast is okay. 1874 * XXX: just experimental. not in the spec. 1875 */ 1876 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1877 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1878 continue; 1879 1880 /* now we can copy the address */ 1881 if (resid < sizeof(struct in6_addr) + 1882 sizeof(u_int32_t)) { 1883 /* 1884 * We give up much more copy. 1885 * Set the truncate flag and return. 1886 */ 1887 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1888 goto out; 1889 } 1890 1891 /* 1892 * Set the TTL of the address. 1893 * The TTL value should be one of the following 1894 * according to the specification: 1895 * 1896 * 1. The remaining lifetime of a DHCP lease on the 1897 * address, or 1898 * 2. The remaining Valid Lifetime of a prefix from 1899 * which the address was derived through Stateless 1900 * Autoconfiguration. 1901 * 1902 * Note that we currently do not support stateful 1903 * address configuration by DHCPv6, so the former 1904 * case can't happen. 1905 * 1906 * TTL must be 2^31 > TTL >= 0. 1907 */ 1908 if (ia6->ia6_lifetime.ia6t_expire == 0) 1909 ltime = ND6_INFINITE_LIFETIME; 1910 else { 1911 if (ia6->ia6_lifetime.ia6t_expire > 1912 time_uptime) 1913 ltime = ia6->ia6_lifetime.ia6t_expire - 1914 time_uptime; 1915 else 1916 ltime = 0; 1917 } 1918 if (ltime > 0x7fffffff) 1919 ltime = 0x7fffffff; 1920 ltime = htonl(ltime); 1921 1922 memcpy(cp, <ime, sizeof(u_int32_t)); 1923 cp += sizeof(u_int32_t); 1924 1925 /* copy the address itself */ 1926 bcopy(&ia6->ia_addr.sin6_addr, cp, 1927 sizeof(struct in6_addr)); 1928 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1929 cp += sizeof(struct in6_addr); 1930 1931 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1932 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1933 } 1934 if (ifp0) /* we need search only on the specified IF */ 1935 break; 1936 } 1937 1938 if (allow_deprecated == 0 && ifp_dep != NULL) { 1939 ifp = ifp_dep; 1940 allow_deprecated = 1; 1941 1942 goto again; 1943 } 1944out: 1945 pserialize_read_exit(s); 1946 return (copied); 1947} 1948 1949/* 1950 * XXX almost dup'ed code with rip6_input. 1951 */ 1952static int 1953icmp6_rip6_input(struct mbuf **mp, int off) 1954{ 1955 struct mbuf *m = *mp; 1956 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1957 struct inpcb_hdr *inph; 1958 struct in6pcb *in6p; 1959 struct in6pcb *last = NULL; 1960 struct sockaddr_in6 rip6src; 1961 struct icmp6_hdr *icmp6; 1962 struct mbuf *n, *opts = NULL; 1963 1964 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1965 if (icmp6 == NULL) { 1966 /* m is already reclaimed */ 1967 return IPPROTO_DONE; 1968 } 1969 1970 /* 1971 * XXX: the address may have embedded scope zone ID, which should be 1972 * hidden from applications. 1973 */ 1974 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1975 if (sa6_recoverscope(&rip6src)) { 1976 m_freem(m); 1977 return (IPPROTO_DONE); 1978 } 1979 1980 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1981 in6p = (struct in6pcb *)inph; 1982 if (in6p->in6p_af != AF_INET6) 1983 continue; 1984 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1985 continue; 1986 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1987 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1988 continue; 1989 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1990 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1991 continue; 1992 if (in6p->in6p_icmp6filt && 1993 ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1994 in6p->in6p_icmp6filt)) 1995 continue; 1996 1997 if (last == NULL) { 1998 ; 1999 } 2000#ifdef IPSEC 2001 else if (ipsec_used && ipsec_in_reject(m, last)) { 2002 /* do not inject data into pcb */ 2003 } 2004#endif 2005 else if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 2006 if (last->in6p_flags & IN6P_CONTROLOPTS) 2007 ip6_savecontrol(last, &opts, ip6, n); 2008 /* strip intermediate headers */ 2009 m_adj(n, off); 2010 if (sbappendaddr(&last->in6p_socket->so_rcv, 2011 sin6tosa(&rip6src), n, opts) == 0) { 2012 soroverflow(last->in6p_socket); 2013 m_freem(n); 2014 if (opts) 2015 m_freem(opts); 2016 } else { 2017 sorwakeup(last->in6p_socket); 2018 } 2019 opts = NULL; 2020 } 2021 2022 last = in6p; 2023 } 2024 2025#ifdef IPSEC 2026 if (ipsec_used && last && ipsec_in_reject(m, last)) { 2027 m_freem(m); 2028 IP6_STATDEC(IP6_STAT_DELIVERED); 2029 /* do not inject data into pcb */ 2030 } else 2031#endif 2032 if (last) { 2033 if (last->in6p_flags & IN6P_CONTROLOPTS) 2034 ip6_savecontrol(last, &opts, ip6, m); 2035 /* strip intermediate headers */ 2036 m_adj(m, off); 2037 if (sbappendaddr(&last->in6p_socket->so_rcv, 2038 sin6tosa(&rip6src), m, opts) == 0) { 2039 soroverflow(last->in6p_socket); 2040 m_freem(m); 2041 if (opts) 2042 m_freem(opts); 2043 } else 2044 sorwakeup(last->in6p_socket); 2045 } else { 2046 m_freem(m); 2047 IP6_STATDEC(IP6_STAT_DELIVERED); 2048 } 2049 return IPPROTO_DONE; 2050} 2051 2052/* 2053 * Reflect the ip6 packet back to the source. 2054 * OFF points to the icmp6 header, counted from the top of the mbuf. 2055 * 2056 * Note: RFC 1885 required that an echo reply should be truncated if it 2057 * did not fit in with (return) path MTU, and KAME code supported the 2058 * behavior. However, as a clarification after the RFC, this limitation 2059 * was removed in a revised version of the spec, RFC 2463. We had kept the 2060 * old behavior, with a (non-default) ifdef block, while the new version of 2061 * the spec was an internet-draft status, and even after the new RFC was 2062 * published. But it would rather make sense to clean the obsoleted part 2063 * up, and to make the code simpler at this stage. 2064 */ 2065static void 2066icmp6_reflect(struct mbuf *m, size_t off) 2067{ 2068 struct ip6_hdr *ip6; 2069 struct icmp6_hdr *icmp6; 2070 const struct in6_ifaddr *ia; 2071 const struct ip6aux *ip6a; 2072 int plen; 2073 int type, code; 2074 struct ifnet *outif = NULL; 2075 struct in6_addr origdst; 2076 struct ifnet *rcvif; 2077 int s; 2078 bool ip6_src_filled = false; 2079 2080 /* too short to reflect */ 2081 if (off < sizeof(struct ip6_hdr)) { 2082 nd6log(LOG_DEBUG, 2083 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2084 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2085 __FILE__, __LINE__); 2086 goto bad; 2087 } 2088 2089 /* 2090 * If there are extra headers between IPv6 and ICMPv6, strip 2091 * off that header first. 2092 */ 2093 CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN); 2094 if (off > sizeof(struct ip6_hdr)) { 2095 size_t l; 2096 struct ip6_hdr nip6; 2097 2098 l = off - sizeof(struct ip6_hdr); 2099 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2100 m_adj(m, l); 2101 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2102 if (m->m_len < l) { 2103 if ((m = m_pullup(m, l)) == NULL) 2104 return; 2105 } 2106 memcpy(mtod(m, void *), (void *)&nip6, sizeof(nip6)); 2107 } else { 2108 size_t l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2109 if (m->m_len < l) { 2110 if ((m = m_pullup(m, l)) == NULL) 2111 return; 2112 } 2113 } 2114 2115 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2116 ip6 = mtod(m, struct ip6_hdr *); 2117 ip6->ip6_nxt = IPPROTO_ICMPV6; 2118 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2119 type = icmp6->icmp6_type; /* keep type for statistics */ 2120 code = icmp6->icmp6_code; /* ditto. */ 2121 2122 origdst = ip6->ip6_dst; 2123 /* 2124 * ip6_input() drops a packet if its src is multicast. 2125 * So, the src is never multicast. 2126 */ 2127 ip6->ip6_dst = ip6->ip6_src; 2128 2129 /* 2130 * If the incoming packet was addressed directly to us (i.e. unicast), 2131 * use dst as the src for the reply. 2132 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2133 * (for example) when we encounter an error while forwarding procedure 2134 * destined to a duplicated address of ours. 2135 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2136 * procedure of an outgoing packet of our own, in which case we need 2137 * to search in the ifaddr list. 2138 */ 2139 if (IN6_IS_ADDR_MULTICAST(&origdst)) 2140 ; 2141 else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2142 if ((ip6a->ip6a_flags & 2143 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2144 ip6->ip6_src = ip6a->ip6a_src; 2145 ip6_src_filled = true; 2146 } 2147 } else { 2148 union { 2149 struct sockaddr_in6 sin6; 2150 struct sockaddr sa; 2151 } u; 2152 int _s; 2153 struct ifaddr *ifa; 2154 2155 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2156 2157 _s = pserialize_read_enter(); 2158 ifa = ifa_ifwithaddr(&u.sa); 2159 2160 if (ifa != NULL) { 2161 ia = ifatoia6(ifa); 2162 if ((ia->ia6_flags & 2163 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2164 ip6->ip6_src = ia->ia_addr.sin6_addr; 2165 ip6_src_filled = true; 2166 } 2167 } 2168 pserialize_read_exit(_s); 2169 } 2170 2171 if (!ip6_src_filled) { 2172 int e; 2173 struct sockaddr_in6 sin6; 2174 struct route ro; 2175 2176 /* 2177 * This case matches to multicasts, our anycast, or unicasts 2178 * that we do not own. Select a source address based on the 2179 * source address of the erroneous packet. 2180 */ 2181 /* zone ID should be embedded */ 2182 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2183 2184 memset(&ro, 0, sizeof(ro)); 2185 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2186 &ip6->ip6_src); 2187 rtcache_free(&ro); 2188 if (e != 0) { 2189 char ip6buf[INET6_ADDRSTRLEN]; 2190 nd6log(LOG_DEBUG, 2191 "source can't be determined: " 2192 "dst=%s, error=%d\n", 2193 IN6_PRINT(ip6buf, &sin6.sin6_addr), e); 2194 goto bad; 2195 } 2196 } 2197 2198 ip6->ip6_flow = 0; 2199 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2200 ip6->ip6_vfc |= IPV6_VERSION; 2201 ip6->ip6_nxt = IPPROTO_ICMPV6; 2202 rcvif = m_get_rcvif(m, &s); 2203 if (rcvif) { 2204 /* XXX: This may not be the outgoing interface */ 2205 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2206 } else 2207 ip6->ip6_hlim = ip6_defhlim; 2208 m_put_rcvif(rcvif, &s); 2209 2210 m->m_pkthdr.csum_flags = 0; 2211 icmp6->icmp6_cksum = 0; 2212 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2213 sizeof(struct ip6_hdr), plen); 2214 2215 /* 2216 * XXX option handling 2217 */ 2218 2219 m->m_flags &= ~(M_BCAST|M_MCAST); 2220 2221 /* 2222 * To avoid a "too big" situation at an intermediate router 2223 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2224 * Note that only echo and node information replies are affected, 2225 * since the length of ICMP6 errors is limited to the minimum MTU. 2226 */ 2227 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) 2228 != 0 && outif) 2229 icmp6_ifstat_inc(outif, ifs6_out_error); 2230 if (outif) 2231 icmp6_ifoutstat_inc(outif, type, code); 2232 2233 return; 2234 2235 bad: 2236 m_freem(m); 2237 return; 2238} 2239 2240static const char * 2241icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6, 2242 struct in6_addr *dst6, struct in6_addr *tgt6) 2243{ 2244 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 2245 char ip6buft[INET6_ADDRSTRLEN]; 2246 2247 snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)", 2248 IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6), 2249 IN6_PRINT(ip6buft, tgt6)); 2250 return buf; 2251} 2252 2253static void 2254icmp6_redirect_input(struct mbuf *m, int off) 2255{ 2256 struct ifnet *ifp; 2257 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2258 struct nd_redirect *nd_rd; 2259 int icmp6len = ntohs(ip6->ip6_plen); 2260 char *lladdr = NULL; 2261 int lladdrlen = 0; 2262 struct rtentry *rt = NULL; 2263 int is_router; 2264 int is_onlink; 2265 struct in6_addr src6 = ip6->ip6_src; 2266 struct in6_addr redtgt6; 2267 struct in6_addr reddst6; 2268 union nd_opts ndopts; 2269 struct psref psref; 2270 char ip6buf[INET6_ADDRSTRLEN]; 2271 char diagbuf[256]; 2272 2273 ifp = m_get_rcvif_psref(m, &psref); 2274 if (ifp == NULL) 2275 goto freeit; 2276 2277 /* XXX if we are router, we don't update route by icmp6 redirect */ 2278 if (ip6_forwarding) 2279 goto freeit; 2280 if (!icmp6_rediraccept) 2281 goto freeit; 2282 2283 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2284 if (nd_rd == NULL) { 2285 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2286 m_put_rcvif_psref(ifp, &psref); 2287 return; 2288 } 2289 redtgt6 = nd_rd->nd_rd_target; 2290 reddst6 = nd_rd->nd_rd_dst; 2291 2292 if (in6_setscope(&redtgt6, ifp, NULL) || 2293 in6_setscope(&reddst6, ifp, NULL)) { 2294 goto freeit; 2295 } 2296 2297 /* validation */ 2298 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2299 nd6log(LOG_ERR, 2300 "ICMP6 redirect sent from %s rejected; " 2301 "must be from linklocal\n", IN6_PRINT(ip6buf, &src6)); 2302 goto bad; 2303 } 2304 if (ip6->ip6_hlim != 255) { 2305 nd6log(LOG_ERR, 2306 "ICMP6 redirect sent from %s rejected; " 2307 "hlim=%d (must be 255)\n", 2308 IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim); 2309 goto bad; 2310 } 2311 2312 { 2313 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2314 struct sockaddr_in6 sin6; 2315 struct in6_addr *gw6; 2316 2317 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2318 rt = rtalloc1(sin6tosa(&sin6), 0); 2319 if (rt) { 2320 if (rt->rt_gateway == NULL || 2321 rt->rt_gateway->sa_family != AF_INET6) { 2322 nd6log(LOG_ERR, 2323 "ICMP6 redirect rejected; no route " 2324 "with inet6 gateway found for redirect dst: %s\n", 2325 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2326 &src6, &reddst6, &redtgt6)); 2327 rt_unref(rt); 2328 goto bad; 2329 } 2330 2331 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2332 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2333 nd6log(LOG_ERR, 2334 "ICMP6 redirect rejected; " 2335 "not equal to gw-for-src=%s (must be same): %s\n", 2336 IN6_PRINT(ip6buf, gw6), 2337 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2338 &src6, &reddst6, &redtgt6)); 2339 rt_unref(rt); 2340 goto bad; 2341 } 2342 } else { 2343 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2344 "no route found for redirect dst: %s\n", 2345 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2346 &src6, &reddst6, &redtgt6)); 2347 goto bad; 2348 } 2349 rt_unref(rt); 2350 rt = NULL; 2351 } 2352 2353 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2354 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2355 "redirect dst must be unicast: %s\n", 2356 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2357 &src6, &reddst6, &redtgt6)); 2358 goto bad; 2359 } 2360 2361 is_router = is_onlink = 0; 2362 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2363 is_router = 1; /* router case */ 2364 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2365 is_onlink = 1; /* on-link destination case */ 2366 if (!is_router && !is_onlink) { 2367 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2368 "neither router case nor onlink case: %s\n", 2369 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2370 &src6, &reddst6, &redtgt6)); 2371 goto bad; 2372 } 2373 /* validation passed */ 2374 2375 icmp6len -= sizeof(*nd_rd); 2376 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2377 if (nd6_options(&ndopts) < 0) { 2378 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2379 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2380 &src6, &reddst6, &redtgt6)); 2381 /* nd6_options have incremented stats */ 2382 goto freeit; 2383 } 2384 2385 if (ndopts.nd_opts_tgt_lladdr) { 2386 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2387 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2388 } 2389 2390 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2391 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2392 "(if %d, icmp6 packet %d): %s\n", 2393 IN6_PRINT(ip6buf, &redtgt6), 2394 ifp->if_addrlen, lladdrlen - 2, 2395 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2396 &src6, &reddst6, &redtgt6)); 2397 goto bad; 2398 } 2399 2400 /* RFC 2461 8.3 */ 2401 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2402 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2403 2404 m_put_rcvif_psref(ifp, &psref); 2405 ifp = NULL; 2406 2407 if (!is_onlink) { /* better router case. perform rtredirect. */ 2408 /* perform rtredirect */ 2409 struct sockaddr_in6 sdst; 2410 struct sockaddr_in6 sgw; 2411 struct sockaddr_in6 ssrc; 2412 unsigned long rtcount; 2413 struct rtentry *newrt = NULL; 2414 2415 /* 2416 * do not install redirect route, if the number of entries 2417 * is too much (> hiwat). note that, the node (= host) will 2418 * work just fine even if we do not install redirect route 2419 * (there will be additional hops, though). 2420 */ 2421 mutex_enter(&icmp6_mtx); 2422 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2423 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) { 2424 mutex_exit(&icmp6_mtx); 2425 goto freeit; 2426 } 2427 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) { 2428 mutex_exit(&icmp6_mtx); 2429 goto freeit; 2430 } else if (0 <= icmp6_redirect_lowat && 2431 rtcount > icmp6_redirect_lowat) { 2432 /* 2433 * XXX nuke a victim, install the new one. 2434 */ 2435 } 2436 2437 memset(&sdst, 0, sizeof(sdst)); 2438 memset(&sgw, 0, sizeof(sgw)); 2439 memset(&ssrc, 0, sizeof(ssrc)); 2440 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2441 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2442 sizeof(struct sockaddr_in6); 2443 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2444 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2445 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2446 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2447 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), &newrt); 2448 2449 if (newrt) { 2450 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2451 icmp6_redirect_timeout_q); 2452 rt_unref(newrt); 2453 } 2454 mutex_exit(&icmp6_mtx); 2455 } 2456 /* finally update cached route in each socket via pfctlinput */ 2457 { 2458 struct sockaddr_in6 sdst; 2459 2460 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2461 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2462#if defined(IPSEC) 2463 if (ipsec_used) 2464 key_sa_routechange(sin6tosa(&sdst)); 2465#endif 2466 } 2467 2468freeit: 2469 if (ifp != NULL) 2470 m_put_rcvif_psref(ifp, &psref); 2471 m_freem(m); 2472 return; 2473 2474bad: 2475 m_put_rcvif_psref(ifp, &psref); 2476 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2477 m_freem(m); 2478} 2479 2480void 2481icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2482{ 2483 struct ifnet *ifp; /* my outgoing interface */ 2484 struct in6_addr *ifp_ll6; 2485 struct in6_addr *nexthop; 2486 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2487 struct mbuf *m = NULL; /* newly allocated one */ 2488 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2489 struct nd_redirect *nd_rd; 2490 size_t maxlen; 2491 u_char *p; 2492 struct sockaddr_in6 src_sa; 2493 2494 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2495 2496 /* if we are not router, we don't send icmp6 redirect */ 2497 if (!ip6_forwarding) 2498 goto fail; 2499 2500 /* sanity check */ 2501 KASSERT(m0 != NULL); 2502 KASSERT(rt != NULL); 2503 2504 ifp = rt->rt_ifp; 2505 2506 /* 2507 * Address check: 2508 * the source address must identify a neighbor, and 2509 * the destination address must not be a multicast address 2510 * [RFC 2461, sec 8.2] 2511 */ 2512 sip6 = mtod(m0, struct ip6_hdr *); 2513 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2514 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2515 goto fail; 2516 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2517 goto fail; /* what should we do here? */ 2518 2519 /* rate limit */ 2520 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2521 goto fail; 2522 2523 /* 2524 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2525 * we almost always ask for an mbuf cluster for simplicity. 2526 * (MHLEN < IPV6_MMTU is almost always true) 2527 */ 2528 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2529 if (m && IPV6_MMTU >= MHLEN) { 2530#if IPV6_MMTU >= MCLBYTES 2531 _MCLGET(m, mcl_cache, IPV6_MMTU, M_DONTWAIT); 2532#else 2533 MCLGET(m, M_DONTWAIT); 2534#endif 2535 } 2536 2537 if (!m) 2538 goto fail; 2539 m_reset_rcvif(m); 2540 m->m_len = 0; 2541 maxlen = M_TRAILINGSPACE(m); 2542 maxlen = min(IPV6_MMTU, maxlen); 2543 2544 /* just for safety */ 2545 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct nd_redirect) + 2546 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2547 goto fail; 2548 } 2549 2550 { 2551 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2552 struct in6_ifaddr *ia; 2553 int s = pserialize_read_enter(); 2554 if ((ia = in6ifa_ifpforlinklocal(ifp, 2555 IN6_IFF_NOTREADY| 2556 IN6_IFF_ANYCAST)) == NULL) { 2557 pserialize_read_exit(s); 2558 goto fail; 2559 } 2560 ifp_ll6 = &ia->ia_addr.sin6_addr; 2561 pserialize_read_exit(s); 2562 } 2563 2564 /* get ip6 linklocal address for the router. */ 2565 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2566 struct sockaddr_in6 *sin6; 2567 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2568 nexthop = &sin6->sin6_addr; 2569 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2570 nexthop = NULL; 2571 } else 2572 nexthop = NULL; 2573 2574 /* ip6 */ 2575 ip6 = mtod(m, struct ip6_hdr *); 2576 ip6->ip6_flow = 0; 2577 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2578 ip6->ip6_vfc |= IPV6_VERSION; 2579 /* ip6->ip6_plen will be set later */ 2580 ip6->ip6_nxt = IPPROTO_ICMPV6; 2581 ip6->ip6_hlim = 255; 2582 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2583 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2584 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2585 2586 /* ND Redirect */ 2587 nd_rd = (struct nd_redirect *)(ip6 + 1); 2588 nd_rd->nd_rd_type = ND_REDIRECT; 2589 nd_rd->nd_rd_code = 0; 2590 nd_rd->nd_rd_reserved = 0; 2591 if (rt->rt_flags & RTF_GATEWAY) { 2592 /* 2593 * nd_rd->nd_rd_target must be a link-local address in 2594 * better router cases. 2595 */ 2596 if (!nexthop) 2597 goto fail; 2598 bcopy(nexthop, &nd_rd->nd_rd_target, 2599 sizeof(nd_rd->nd_rd_target)); 2600 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2601 sizeof(nd_rd->nd_rd_dst)); 2602 } else { 2603 /* make sure redtgt == reddst */ 2604 nexthop = &sip6->ip6_dst; 2605 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2606 sizeof(nd_rd->nd_rd_target)); 2607 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2608 sizeof(nd_rd->nd_rd_dst)); 2609 } 2610 2611 p = (u_char *)(nd_rd + 1); 2612 2613 { 2614 /* target lladdr option */ 2615 struct llentry *ln = NULL; 2616 int len, pad; 2617 struct nd_opt_hdr *nd_opt; 2618 char *lladdr; 2619 2620 ln = nd6_lookup(nexthop, ifp, false); 2621 if (ln == NULL) 2622 goto nolladdropt; 2623 len = sizeof(*nd_opt) + ifp->if_addrlen; 2624 len = (len + 7) & ~7; /* round by 8 */ 2625 pad = len - (sizeof(*nd_opt) + ifp->if_addrlen); 2626 2627 /* safety check */ 2628 if (len + (p - (u_char *)ip6) > maxlen) { 2629 LLE_RUNLOCK(ln); 2630 goto nolladdropt; 2631 } 2632 2633 if (ln->la_flags & LLE_VALID) { 2634 nd_opt = (struct nd_opt_hdr *)p; 2635 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2636 nd_opt->nd_opt_len = len >> 3; 2637 lladdr = (char *)(nd_opt + 1); 2638 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2639 memset(lladdr + ifp->if_addrlen, 0, pad); 2640 p += len; 2641 } 2642 LLE_RUNLOCK(ln); 2643 } 2644nolladdropt: 2645 2646 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2647 2648 /* just to be safe */ 2649 if (m0->m_flags & M_DECRYPTED) 2650 goto noredhdropt; 2651 if (p - (u_char *)ip6 > maxlen) 2652 goto noredhdropt; 2653 2654 { 2655 /* redirected header option */ 2656 int len; 2657 struct nd_opt_rd_hdr *nd_opt_rh; 2658 2659 /* 2660 * compute the maximum size for icmp6 redirect header option. 2661 * XXX room for auth header? 2662 */ 2663 len = maxlen - (p - (u_char *)ip6); 2664 len &= ~7; 2665 2666 if (len < sizeof(*nd_opt_rh)) { 2667 goto noredhdropt; 2668 } 2669 2670 /* 2671 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2672 * about padding/truncate rule for the original IP packet. 2673 * From the discussion on IPv6imp in Feb 1999, 2674 * the consensus was: 2675 * - "attach as much as possible" is the goal 2676 * - pad if not aligned (original size can be guessed by 2677 * original ip6 header) 2678 * Following code adds the padding if it is simple enough, 2679 * and truncates if not. 2680 */ 2681 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2682 /* not enough room, truncate */ 2683 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2684 m0->m_pkthdr.len); 2685 } else { 2686 /* 2687 * enough room, truncate if not aligned. 2688 * we don't pad here for simplicity. 2689 */ 2690 int extra; 2691 2692 extra = m0->m_pkthdr.len % 8; 2693 if (extra) { 2694 /* truncate */ 2695 m_adj(m0, -extra); 2696 } 2697 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2698 } 2699 2700 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2701 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2702 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2703 nd_opt_rh->nd_opt_rh_len = len >> 3; 2704 p += sizeof(*nd_opt_rh); 2705 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2706 2707 /* connect m0 to m */ 2708 m->m_pkthdr.len += m0->m_pkthdr.len; 2709 m_cat(m, m0); 2710 m0 = NULL; 2711 } 2712noredhdropt: 2713 if (m0) { 2714 m_freem(m0); 2715 m0 = NULL; 2716 } 2717 2718 /* XXX: clear embedded link IDs in the inner header */ 2719 in6_clearscope(&sip6->ip6_src); 2720 in6_clearscope(&sip6->ip6_dst); 2721 in6_clearscope(&nd_rd->nd_rd_target); 2722 in6_clearscope(&nd_rd->nd_rd_dst); 2723 2724 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2725 2726 nd_rd->nd_rd_cksum = 0; 2727 nd_rd->nd_rd_cksum = 2728 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2729 2730 /* send the packet to outside... */ 2731 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2732 icmp6_ifstat_inc(ifp, ifs6_out_error); 2733 2734 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2735 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2736 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2737 2738 return; 2739 2740fail: 2741 if (m) 2742 m_freem(m); 2743 if (m0) 2744 m_freem(m0); 2745} 2746 2747/* 2748 * ICMPv6 socket option processing. 2749 */ 2750int 2751icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2752{ 2753 int error = 0; 2754 struct in6pcb *in6p = sotoin6pcb(so); 2755 2756 if (sopt->sopt_level != IPPROTO_ICMPV6) 2757 return rip6_ctloutput(op, so, sopt); 2758 2759 switch (op) { 2760 case PRCO_SETOPT: 2761 switch (sopt->sopt_name) { 2762 case ICMP6_FILTER: 2763 { 2764 struct icmp6_filter fil; 2765 2766 error = sockopt_get(sopt, &fil, sizeof(fil)); 2767 if (error) 2768 break; 2769 memcpy(in6p->in6p_icmp6filt, &fil, 2770 sizeof(struct icmp6_filter)); 2771 error = 0; 2772 break; 2773 } 2774 2775 default: 2776 error = ENOPROTOOPT; 2777 break; 2778 } 2779 break; 2780 2781 case PRCO_GETOPT: 2782 switch (sopt->sopt_name) { 2783 case ICMP6_FILTER: 2784 { 2785 if (in6p->in6p_icmp6filt == NULL) { 2786 error = EINVAL; 2787 break; 2788 } 2789 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2790 sizeof(struct icmp6_filter)); 2791 break; 2792 } 2793 2794 default: 2795 error = ENOPROTOOPT; 2796 break; 2797 } 2798 break; 2799 } 2800 2801 return (error); 2802} 2803 2804/* 2805 * Perform rate limit check. 2806 * Returns 0 if it is okay to send the icmp6 packet. 2807 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2808 * limitation. 2809 * 2810 * XXX per-destination/type check necessary? 2811 */ 2812static int 2813icmp6_ratelimit( 2814 const struct in6_addr *dst, /* not used at this moment */ 2815 const int type, /* not used at this moment */ 2816 const int code) /* not used at this moment */ 2817{ 2818 int ret; 2819 2820 ret = 0; /* okay to send */ 2821 2822 /* PPS limit */ 2823 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2824 icmp6errppslim)) { 2825 /* The packet is subject to rate limit */ 2826 ret++; 2827 } 2828 2829 return ret; 2830} 2831 2832static struct rtentry * 2833icmp6_mtudisc_clone(struct sockaddr *dst) 2834{ 2835 struct rtentry *rt; 2836 int error; 2837 2838 rt = rtalloc1(dst, 1); 2839 if (rt == 0) 2840 return NULL; 2841 2842 /* If we didn't get a host route, allocate one */ 2843 if ((rt->rt_flags & RTF_HOST) == 0) { 2844 struct rtentry *nrt; 2845 2846 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2847 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2848 if (error) { 2849 rt_unref(rt); 2850 return NULL; 2851 } 2852 nrt->rt_rmx = rt->rt_rmx; 2853 rt_unref(rt); 2854 rt = nrt; 2855 } 2856 2857 mutex_enter(&icmp6_mtx); 2858 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2859 icmp6_mtudisc_timeout_q); 2860 mutex_exit(&icmp6_mtx); 2861 2862 if (error) { 2863 rt_unref(rt); 2864 return NULL; 2865 } 2866 2867 return rt; /* caller need to call rtfree() */ 2868} 2869 2870static void 2871icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2872{ 2873 2874 KASSERT(rt != NULL); 2875 rt_assert_referenced(rt); 2876 2877 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2878 (RTF_DYNAMIC | RTF_HOST)) { 2879 rtrequest(RTM_DELETE, rt_getkey(rt), 2880 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2881 } else { 2882 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2883 rt->rt_rmx.rmx_mtu = 0; 2884 } 2885} 2886 2887static void 2888icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2889{ 2890 2891 KASSERT(rt != NULL); 2892 rt_assert_referenced(rt); 2893 2894 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2895 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2896 rtrequest(RTM_DELETE, rt_getkey(rt), 2897 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2898 } 2899} 2900 2901/* 2902 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2903 */ 2904static int 2905sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2906{ 2907 (void)&name; 2908 (void)&l; 2909 (void)&oname; 2910 2911 if (namelen != 0) 2912 return (EINVAL); 2913 2914 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2915 /*XXXUNCONST*/ 2916 __UNCONST(newp), newlen)); 2917} 2918 2919static int 2920sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2921{ 2922 2923 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2924} 2925 2926static int 2927sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2928{ 2929 int error, tmp; 2930 struct sysctlnode node; 2931 2932 mutex_enter(&icmp6_mtx); 2933 2934 node = *rnode; 2935 node.sysctl_data = &tmp; 2936 tmp = icmp6_redirtimeout; 2937 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2938 if (error || newp == NULL) 2939 goto out; 2940 if (tmp < 0) { 2941 error = EINVAL; 2942 goto out; 2943 } 2944 icmp6_redirtimeout = tmp; 2945 2946 if (icmp6_redirect_timeout_q != NULL) { 2947 if (icmp6_redirtimeout == 0) { 2948 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2949 } else { 2950 rt_timer_queue_change(icmp6_redirect_timeout_q, 2951 icmp6_redirtimeout); 2952 } 2953 } else if (icmp6_redirtimeout > 0) { 2954 icmp6_redirect_timeout_q = 2955 rt_timer_queue_create(icmp6_redirtimeout); 2956 } 2957 error = 0; 2958out: 2959 mutex_exit(&icmp6_mtx); 2960 return error; 2961} 2962 2963static void 2964sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2965{ 2966 extern int nd6_maxqueuelen; /* defined in nd6.c */ 2967 2968 sysctl_createv(clog, 0, NULL, NULL, 2969 CTLFLAG_PERMANENT, 2970 CTLTYPE_NODE, "inet6", NULL, 2971 NULL, 0, NULL, 0, 2972 CTL_NET, PF_INET6, CTL_EOL); 2973 sysctl_createv(clog, 0, NULL, NULL, 2974 CTLFLAG_PERMANENT, 2975 CTLTYPE_NODE, "icmp6", 2976 SYSCTL_DESCR("ICMPv6 related settings"), 2977 NULL, 0, NULL, 0, 2978 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2979 2980 sysctl_createv(clog, 0, NULL, NULL, 2981 CTLFLAG_PERMANENT, 2982 CTLTYPE_STRUCT, "stats", 2983 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2984 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2985 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2986 ICMPV6CTL_STATS, CTL_EOL); 2987 sysctl_createv(clog, 0, NULL, NULL, 2988 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2989 CTLTYPE_INT, "rediraccept", 2990 SYSCTL_DESCR("Accept and process redirect messages"), 2991 NULL, 0, &icmp6_rediraccept, 0, 2992 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2993 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2994 sysctl_createv(clog, 0, NULL, NULL, 2995 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2996 CTLTYPE_INT, "redirtimeout", 2997 SYSCTL_DESCR("Redirect generated route lifetime"), 2998 sysctl_net_inet6_icmp6_redirtimeout, 0, 2999 &icmp6_redirtimeout, 0, 3000 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3001 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 3002#if 0 /* obsoleted */ 3003 sysctl_createv(clog, 0, NULL, NULL, 3004 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3005 CTLTYPE_INT, "errratelimit", NULL, 3006 NULL, 0, &icmp6_errratelimit, 0, 3007 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3008 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 3009#endif 3010 sysctl_createv(clog, 0, NULL, NULL, 3011 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3012 CTLTYPE_INT, "nd6_prune", 3013 SYSCTL_DESCR("Neighbor discovery prune interval"), 3014 NULL, 0, &nd6_prune, 0, 3015 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3016 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 3017 sysctl_createv(clog, 0, NULL, NULL, 3018 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3019 CTLTYPE_INT, "nd6_delay", 3020 SYSCTL_DESCR("First probe delay time"), 3021 NULL, 0, &nd6_delay, 0, 3022 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3023 ICMPV6CTL_ND6_DELAY, CTL_EOL); 3024 sysctl_createv(clog, 0, NULL, NULL, 3025 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3026 CTLTYPE_INT, "nd6_umaxtries", 3027 SYSCTL_DESCR("Number of unicast discovery attempts"), 3028 NULL, 0, &nd6_umaxtries, 0, 3029 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3030 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 3031 sysctl_createv(clog, 0, NULL, NULL, 3032 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3033 CTLTYPE_INT, "nd6_mmaxtries", 3034 SYSCTL_DESCR("Number of multicast discovery attempts"), 3035 NULL, 0, &nd6_mmaxtries, 0, 3036 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3037 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 3038 sysctl_createv(clog, 0, NULL, NULL, 3039 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3040 CTLTYPE_INT, "nd6_useloopback", 3041 SYSCTL_DESCR("Use loopback interface for local traffic"), 3042 NULL, 0, &nd6_useloopback, 0, 3043 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3044 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 3045#if 0 /* obsoleted */ 3046 sysctl_createv(clog, 0, NULL, NULL, 3047 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3048 CTLTYPE_INT, "nd6_proxyall", NULL, 3049 NULL, 0, &nd6_proxyall, 0, 3050 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3051 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 3052#endif 3053 sysctl_createv(clog, 0, NULL, NULL, 3054 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3055 CTLTYPE_INT, "nodeinfo", 3056 SYSCTL_DESCR("Respond to node information requests"), 3057 NULL, 0, &icmp6_nodeinfo, 0, 3058 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3059 ICMPV6CTL_NODEINFO, CTL_EOL); 3060 sysctl_createv(clog, 0, NULL, NULL, 3061 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3062 CTLTYPE_INT, "errppslimit", 3063 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 3064 NULL, 0, &icmp6errppslim, 0, 3065 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3066 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 3067 sysctl_createv(clog, 0, NULL, NULL, 3068 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3069 CTLTYPE_INT, "nd6_maxnudhint", 3070 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 3071 NULL, 0, &nd6_maxnudhint, 0, 3072 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3073 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 3074 sysctl_createv(clog, 0, NULL, NULL, 3075 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3076 CTLTYPE_INT, "mtudisc_hiwat", 3077 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3078 NULL, 0, &icmp6_mtudisc_hiwat, 0, 3079 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3080 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 3081 sysctl_createv(clog, 0, NULL, NULL, 3082 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3083 CTLTYPE_INT, "mtudisc_lowat", 3084 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3085 NULL, 0, &icmp6_mtudisc_lowat, 0, 3086 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3087 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 3088 sysctl_createv(clog, 0, NULL, NULL, 3089 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3090 CTLTYPE_INT, "nd6_debug", 3091 SYSCTL_DESCR("Enable neighbor discovery debug output"), 3092 NULL, 0, &nd6_debug, 0, 3093 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3094 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 3095 sysctl_createv(clog, 0, NULL, NULL, 3096 CTLFLAG_PERMANENT, 3097 CTLTYPE_STRUCT, "nd6_drlist", 3098 SYSCTL_DESCR("Default router list"), 3099 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3100 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3101 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 3102 sysctl_createv(clog, 0, NULL, NULL, 3103 CTLFLAG_PERMANENT, 3104 CTLTYPE_STRUCT, "nd6_prlist", 3105 SYSCTL_DESCR("Prefix list"), 3106 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3107 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3108 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 3109 sysctl_createv(clog, 0, NULL, NULL, 3110 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3111 CTLTYPE_INT, "maxqueuelen", 3112 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3113 NULL, 1, &nd6_maxqueuelen, 0, 3114 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3115 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3116} 3117 3118void 3119icmp6_statinc(u_int stat) 3120{ 3121 3122 KASSERT(stat < ICMP6_NSTATS); 3123 ICMP6_STATINC(stat); 3124} 3125