icmp6.c revision 121472
1221828Sgrehan/* $FreeBSD: head/sys/netinet6/icmp6.c 121472 2003-10-24 18:26:30Z ume $ */ 2221828Sgrehan/* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */ 3221828Sgrehan 4221828Sgrehan/* 5221828Sgrehan * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6221828Sgrehan * All rights reserved. 7221828Sgrehan * 8221828Sgrehan * Redistribution and use in source and binary forms, with or without 9221828Sgrehan * modification, are permitted provided that the following conditions 10221828Sgrehan * are met: 11221828Sgrehan * 1. Redistributions of source code must retain the above copyright 12221828Sgrehan * notice, this list of conditions and the following disclaimer. 13221828Sgrehan * 2. Redistributions in binary form must reproduce the above copyright 14221828Sgrehan * notice, this list of conditions and the following disclaimer in the 15221828Sgrehan * documentation and/or other materials provided with the distribution. 16221828Sgrehan * 3. Neither the name of the project nor the names of its contributors 17221828Sgrehan * may be used to endorse or promote products derived from this software 18221828Sgrehan * without specific prior written permission. 19221828Sgrehan * 20221828Sgrehan * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21221828Sgrehan * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22221828Sgrehan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23221828Sgrehan * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24221828Sgrehan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25221828Sgrehan * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26245678Sneel * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27221828Sgrehan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28221828Sgrehan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29221828Sgrehan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30221828Sgrehan * SUCH DAMAGE. 31221828Sgrehan */ 32265062Sneel 33265062Sneel/* 34265062Sneel * Copyright (c) 1982, 1986, 1988, 1993 35265062Sneel * The Regents of the University of California. All rights reserved. 36265203Sneel * 37265062Sneel * Redistribution and use in source and binary forms, with or without 38265062Sneel * modification, are permitted provided that the following conditions 39265062Sneel * are met: 40221828Sgrehan * 1. Redistributions of source code must retain the above copyright 41221828Sgrehan * notice, this list of conditions and the following disclaimer. 42221828Sgrehan * 2. Redistributions in binary form must reproduce the above copyright 43221828Sgrehan * notice, this list of conditions and the following disclaimer in the 44221828Sgrehan * documentation and/or other materials provided with the distribution. 45262506Sneel * 3. All advertising materials mentioning features or use of this software 46221828Sgrehan * must display the following acknowledgement: 47221828Sgrehan * This product includes software developed by the University of 48221828Sgrehan * California, Berkeley and its contributors. 49221828Sgrehan * 4. Neither the name of the University nor the names of its contributors 50258579Sneel * may be used to endorse or promote products derived from this software 51258075Sneel * without specific prior written permission. 52221828Sgrehan * 53256072Sneel * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54256072Sneel * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55256072Sneel * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56221828Sgrehan * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57266573Sneel * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58240922Sneel * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59240922Sneel * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60260466Sneel * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61221828Sgrehan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62259782Sjhb * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63256072Sneel * SUCH DAMAGE. 64256072Sneel * 65263780Sneel * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 66263780Sneel */ 67221828Sgrehan 68221828Sgrehan#include "opt_inet.h" 69221828Sgrehan#include "opt_inet6.h" 70221828Sgrehan#include "opt_ipsec.h" 71221828Sgrehan 72221828Sgrehan#include <sys/param.h> 73221828Sgrehan#include <sys/domain.h> 74221828Sgrehan#include <sys/kernel.h> 75221828Sgrehan#include <sys/lock.h> 76221828Sgrehan#include <sys/malloc.h> 77221828Sgrehan#include <sys/mbuf.h> 78256072Sneel#include <sys/protosw.h> 79256072Sneel#include <sys/signalvar.h> 80259863Sneel#include <sys/socket.h> 81259863Sneel#include <sys/socketvar.h> 82221828Sgrehan#include <sys/sx.h> 83221828Sgrehan#include <sys/syslog.h> 84221828Sgrehan#include <sys/systm.h> 85221828Sgrehan#include <sys/time.h> 86259782Sjhb 87221828Sgrehan#include <net/if.h> 88221828Sgrehan#include <net/if_dl.h> 89221828Sgrehan#include <net/if_types.h> 90221828Sgrehan#include <net/route.h> 91221828Sgrehan 92221828Sgrehan#include <netinet/in.h> 93221828Sgrehan#include <netinet/in_pcb.h> 94221828Sgrehan#include <netinet/in_var.h> 95221828Sgrehan#include <netinet/ip6.h> 96221828Sgrehan#include <netinet/icmp6.h> 97256072Sneel#include <netinet6/in6_ifattach.h> 98256072Sneel#include <netinet6/in6_pcb.h> 99259863Sneel#include <netinet6/ip6protosw.h> 100259863Sneel#include <netinet6/ip6_var.h> 101221828Sgrehan#include <netinet6/mld6_var.h> 102221828Sgrehan#include <netinet6/nd6.h> 103221828Sgrehan 104221828Sgrehan#ifdef IPSEC 105221828Sgrehan#include <netinet6/ipsec.h> 106249396Sneel#include <netkey/key.h> 107221828Sgrehan#endif 108221828Sgrehan 109241041Sneel#ifdef FAST_IPSEC 110221828Sgrehan#include <netipsec/ipsec.h> 111221828Sgrehan#include <netipsec/key.h> 112256072Sneel#define IPSEC 113256072Sneel#endif 114256072Sneel 115221828Sgrehan#include <net/net_osdep.h> 116221828Sgrehan 117256072Sneelextern struct domain inet6domain; 118256072Sneel 119256072Sneelstruct icmp6stat icmp6stat; 120221828Sgrehan 121221828Sgrehanextern struct inpcbhead ripcb; 122221828Sgrehanextern int icmp6errppslim; 123221828Sgrehanstatic int icmp6errpps_count = 0; 124221828Sgrehanstatic struct timeval icmp6errppslim_last; 125221828Sgrehanextern int icmp6_nodeinfo; 126221828Sgrehan 127265062Sneelstatic void icmp6_errcount __P((struct icmp6errstat *, int, int)); 128221828Sgrehanstatic int icmp6_rip6_input __P((struct mbuf **, int)); 129241982Sneelstatic int icmp6_ratelimit __P((const struct in6_addr *, const int, const int)); 130241982Sneelstatic const char *icmp6_redirect_diag __P((struct in6_addr *, 131263211Stychon struct in6_addr *, struct in6_addr *)); 132263211Stychonstatic struct mbuf *ni6_input __P((struct mbuf *, int)); 133263211Stychonstatic struct mbuf *ni6_nametodns __P((const char *, int, int)); 134221828Sgrehanstatic int ni6_dnsmatch __P((const char *, int, const char *, int)); 135221828Sgrehanstatic int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 136258075Sneel struct ifnet **, char *)); 137258579Sneelstatic int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 138221828Sgrehan struct ifnet *, int)); 139221828Sgrehanstatic int icmp6_notify_error __P((struct mbuf *, int, int, int)); 140240922Sneel 141240922Sneel#ifdef COMPAT_RFC1885 142258075Sneelstatic struct route_in6 icmp6_reflect_rt; 143221828Sgrehan#endif 144223621Sgrehan 145240894Sneel 146265062Sneelvoid 147221828Sgrehanicmp6_init() 148221828Sgrehan{ 149260619Sneel mld6_init(); 150260619Sneel} 151260619Sneel 152260619Sneelstatic void 153260619Sneelicmp6_errcount(stat, type, code) 154260619Sneel struct icmp6errstat *stat; 155260619Sneel int type, code; 156260619Sneel{ 157260619Sneel switch (type) { 158260619Sneel case ICMP6_DST_UNREACH: 159260619Sneel switch (code) { 160260619Sneel case ICMP6_DST_UNREACH_NOROUTE: 161260619Sneel stat->icp6errs_dst_unreach_noroute++; 162260619Sneel return; 163260619Sneel case ICMP6_DST_UNREACH_ADMIN: 164260619Sneel stat->icp6errs_dst_unreach_admin++; 165260619Sneel return; 166260619Sneel case ICMP6_DST_UNREACH_BEYONDSCOPE: 167260619Sneel stat->icp6errs_dst_unreach_beyondscope++; 168260619Sneel return; 169260619Sneel case ICMP6_DST_UNREACH_ADDR: 170260619Sneel stat->icp6errs_dst_unreach_addr++; 171260619Sneel return; 172260619Sneel case ICMP6_DST_UNREACH_NOPORT: 173263780Sneel stat->icp6errs_dst_unreach_noport++; 174263780Sneel return; 175263780Sneel } 176263780Sneel break; 177263780Sneel case ICMP6_PACKET_TOO_BIG: 178263780Sneel stat->icp6errs_packet_too_big++; 179263780Sneel return; 180260619Sneel case ICMP6_TIME_EXCEEDED: 181221828Sgrehan switch (code) { 182221828Sgrehan case ICMP6_TIME_EXCEED_TRANSIT: 183221828Sgrehan stat->icp6errs_time_exceed_transit++; 184221828Sgrehan return; 185221828Sgrehan case ICMP6_TIME_EXCEED_REASSEMBLY: 186221828Sgrehan stat->icp6errs_time_exceed_reassembly++; 187221828Sgrehan return; 188221828Sgrehan } 189221828Sgrehan break; 190241489Sneel case ICMP6_PARAM_PROB: 191241489Sneel switch (code) { 192256072Sneel case ICMP6_PARAMPROB_HEADER: 193241489Sneel stat->icp6errs_paramprob_header++; 194256072Sneel return; 195241489Sneel case ICMP6_PARAMPROB_NEXTHEADER: 196221828Sgrehan stat->icp6errs_paramprob_nextheader++; 197259737Sneel return; 198259737Sneel case ICMP6_PARAMPROB_OPTION: 199249879Sgrehan stat->icp6errs_paramprob_option++; 200221828Sgrehan return; 201221828Sgrehan } 202249879Sgrehan break; 203221828Sgrehan case ND_REDIRECT: 204249879Sgrehan stat->icp6errs_redirect++; 205221828Sgrehan return; 206221828Sgrehan } 207241489Sneel stat->icp6errs_unknown++; 208259863Sneel} 209256072Sneel 210256072Sneel/* 211256072Sneel * Generate an error packet of type error in response to bad IP6 packet. 212263035Stychon */ 213263744Stychonvoid 214262506Sneelicmp6_error(m, type, code, param) 215262506Sneel struct mbuf *m; 216262506Sneel int type, code, param; 217262506Sneel{ 218262506Sneel struct ip6_hdr *oip6, *nip6; 219262506Sneel struct icmp6_hdr *icmp6; 220262506Sneel u_int preplen; 221262506Sneel int off; 222262506Sneel int nxt; 223262506Sneel 224262506Sneel icmp6stat.icp6s_error++; 225262506Sneel 226262506Sneel /* count per-type-code statistics */ 227262506Sneel icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 228262506Sneel 229262506Sneel#ifdef M_DECRYPTED /*not openbsd*/ 230262506Sneel if (m->m_flags & M_DECRYPTED) { 231262506Sneel icmp6stat.icp6s_canterror++; 232262506Sneel goto freeit; 233262506Sneel } 234262506Sneel#endif 235262506Sneel 236262506Sneel#ifndef PULLDOWN_TEST 237262506Sneel IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 238262506Sneel#else 239262506Sneel if (m->m_len < sizeof(struct ip6_hdr)) { 240266626Sneel m = m_pullup(m, sizeof(struct ip6_hdr)); 241262506Sneel if (m == NULL) 242266573Sneel return; 243266573Sneel } 244221828Sgrehan#endif 245221828Sgrehan oip6 = mtod(m, struct ip6_hdr *); 246243640Sneel 247243640Sneel /* 248255438Sgrehan * If the destination address of the erroneous packet is a multicast 249221828Sgrehan * address, or the packet was sent using link-layer multicast, 250221828Sgrehan * we should basically suppress sending an error (RFC 2463, Section 251221828Sgrehan * 2.4). 252221828Sgrehan * We have two exceptions (the item e.2 in that section): 253221828Sgrehan * - the Pakcet Too Big message can be sent for path MTU discovery. 254221828Sgrehan * - the Parameter Problem Message that can be allowed an icmp6 error 255221828Sgrehan * in the option type field. This check has been done in 256221828Sgrehan * ip6_unknown_opt(), so we can just check the type and code. 257221828Sgrehan */ 258221828Sgrehan if ((m->m_flags & (M_BCAST|M_MCAST) || 259221828Sgrehan IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 260221828Sgrehan (type != ICMP6_PACKET_TOO_BIG && 261221828Sgrehan (type != ICMP6_PARAM_PROB || 262221828Sgrehan code != ICMP6_PARAMPROB_OPTION))) 263221828Sgrehan goto freeit; 264221828Sgrehan 265221828Sgrehan /* 266221828Sgrehan * RFC 2463, 2.4 (e.5): source address check. 267221828Sgrehan * XXX: the case of anycast source? 268221828Sgrehan */ 269221828Sgrehan if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 270221828Sgrehan IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 271221828Sgrehan goto freeit; 272221828Sgrehan 273221828Sgrehan /* 274221828Sgrehan * If we are about to send ICMPv6 against ICMPv6 error/redirect, 275221828Sgrehan * don't do it. 276221828Sgrehan */ 277221828Sgrehan nxt = -1; 278221828Sgrehan off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 279221828Sgrehan if (off >= 0 && nxt == IPPROTO_ICMPV6) { 280221828Sgrehan struct icmp6_hdr *icp; 281221828Sgrehan 282221828Sgrehan#ifndef PULLDOWN_TEST 283221828Sgrehan IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 284221828Sgrehan icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 285221828Sgrehan#else 286221828Sgrehan IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 287266626Sneel sizeof(*icp)); 288221828Sgrehan if (icp == NULL) { 289221828Sgrehan icmp6stat.icp6s_tooshort++; 290221828Sgrehan return; 291221828Sgrehan } 292221828Sgrehan#endif 293221828Sgrehan if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 294221828Sgrehan icp->icmp6_type == ND_REDIRECT) { 295221828Sgrehan /* 296221828Sgrehan * ICMPv6 error 297221828Sgrehan * Special case: for redirect (which is 298221828Sgrehan * informational) we must not send icmp6 error. 299256645Sneel */ 300221828Sgrehan icmp6stat.icp6s_canterror++; 301221828Sgrehan goto freeit; 302221828Sgrehan } else { 303240922Sneel /* ICMPv6 informational - send the error */ 304262236Sneel } 305240922Sneel } else { 306240922Sneel /* non-ICMPv6 - send the error */ 307240922Sneel } 308240922Sneel 309266125Sjhb oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 310266125Sjhb 311266125Sjhb /* Finally, do rate limitation check. */ 312266125Sjhb if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 313266125Sjhb icmp6stat.icp6s_toofreq++; 314221828Sgrehan goto freeit; 315221828Sgrehan } 316221828Sgrehan 317221828Sgrehan /* 318221828Sgrehan * OK, ICMP6 can be generated. 319221828Sgrehan */ 320221828Sgrehan 321221828Sgrehan if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 322221828Sgrehan m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 323221828Sgrehan 324221828Sgrehan preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 325221828Sgrehan M_PREPEND(m, preplen, M_DONTWAIT); 326221828Sgrehan if (m && m->m_len < preplen) 327221828Sgrehan m = m_pullup(m, preplen); 328221828Sgrehan if (m == NULL) { 329221828Sgrehan nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 330221828Sgrehan return; 331221828Sgrehan } 332221828Sgrehan 333221828Sgrehan nip6 = mtod(m, struct ip6_hdr *); 334221828Sgrehan nip6->ip6_src = oip6->ip6_src; 335221828Sgrehan nip6->ip6_dst = oip6->ip6_dst; 336234761Sgrehan 337256072Sneel in6_clearscope(&oip6->ip6_src); 338240912Sneel in6_clearscope(&oip6->ip6_dst); 339265101Sneel 340260619Sneel icmp6 = (struct icmp6_hdr *)(nip6 + 1); 341261170Sneel icmp6->icmp6_type = type; 342263780Sneel icmp6->icmp6_code = code; 343266573Sneel icmp6->icmp6_pptr = htonl((u_int32_t)param); 344234761Sgrehan 345221828Sgrehan /* 346221828Sgrehan * icmp6_reflect() is designed to be in the input path. 347266573Sneel * icmp6_error() can be called from both input and outut path, 348266573Sneel * and if we are in output path rcvif could contain bogus value. 349266573Sneel * clear m->m_pkthdr.rcvif for safety, we should have enough scope 350266573Sneel * information in ip header (nip6). 351266573Sneel */ 352266573Sneel m->m_pkthdr.rcvif = NULL; 353266573Sneel 354266573Sneel icmp6stat.icp6s_outhist[type]++; 355266573Sneel icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 356266573Sneel 357266573Sneel return; 358266573Sneel 359266573Sneel freeit: 360266573Sneel /* 361266573Sneel * If we can't tell wheter or not we can generate ICMP6, free it. 362266573Sneel */ 363266573Sneel m_freem(m); 364266573Sneel} 365266573Sneel 366266573Sneel/* 367266573Sneel * Process a received ICMP6 message. 368266573Sneel */ 369266573Sneelint 370266573Sneelicmp6_input(mp, offp, proto) 371266573Sneel struct mbuf **mp; 372266573Sneel int *offp, proto; 373221828Sgrehan{ 374221828Sgrehan struct mbuf *m = *mp, *n; 375221828Sgrehan struct ip6_hdr *ip6, *nip6; 376221828Sgrehan struct icmp6_hdr *icmp6, *nicmp6; 377221828Sgrehan int off = *offp; 378266573Sneel int icmp6len = m->m_pkthdr.len - *offp; 379266573Sneel int code, sum, noff; 380221828Sgrehan 381241497Sgrehan#ifndef PULLDOWN_TEST 382256072Sneel IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 383256072Sneel /* m might change if M_LOOP. So, call mtod after this */ 384256072Sneel#endif 385256072Sneel 386256072Sneel /* 387256072Sneel * Locate icmp6 structure in mbuf, and check 388261504Sjhb * that not corrupted and of at least minimum length 389261504Sjhb */ 390266424Sneel 391243640Sneel ip6 = mtod(m, struct ip6_hdr *); 392256072Sneel if (icmp6len < sizeof(struct icmp6_hdr)) { 393221828Sgrehan icmp6stat.icp6s_tooshort++; 394221828Sgrehan goto freeit; 395221828Sgrehan } 396221828Sgrehan 397221828Sgrehan /* 398260167Sneel * calculate the checksum 399260167Sneel */ 400260167Sneel#ifndef PULLDOWN_TEST 401260167Sneel icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 402260167Sneel#else 403221828Sgrehan IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 404221828Sgrehan if (icmp6 == NULL) { 405260167Sneel icmp6stat.icp6s_tooshort++; 406260167Sneel return IPPROTO_DONE; 407260167Sneel } 408260167Sneel#endif 409260167Sneel code = icmp6->icmp6_code; 410260167Sneel 411221828Sgrehan if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 412221828Sgrehan nd6log((LOG_ERR, 413221828Sgrehan "ICMP6 checksum error(%d|%x) %s\n", 414221828Sgrehan icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); 415221828Sgrehan icmp6stat.icp6s_checksum++; 416240912Sneel goto freeit; 417240912Sneel } 418240912Sneel 419240912Sneel if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 420259081Sneel /* 421259081Sneel * Deliver very specific ICMP6 type only. 422259081Sneel * This is important to deilver TOOBIG. Otherwise PMTUD 423261170Sneel * will not work. 424261170Sneel */ 425261170Sneel switch (icmp6->icmp6_type) { 426265062Sneel case ICMP6_DST_UNREACH: 427265062Sneel case ICMP6_PACKET_TOO_BIG: 428265062Sneel case ICMP6_TIME_EXCEEDED: 429221828Sgrehan break; 430221828Sgrehan default: 431221828Sgrehan goto freeit; 432221828Sgrehan } 433 } 434 435 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 436 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 437 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 438 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 439 440 switch (icmp6->icmp6_type) { 441 case ICMP6_DST_UNREACH: 442 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 443 switch (code) { 444 case ICMP6_DST_UNREACH_NOROUTE: 445 code = PRC_UNREACH_NET; 446 break; 447 case ICMP6_DST_UNREACH_ADMIN: 448 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 449 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 450 break; 451 case ICMP6_DST_UNREACH_ADDR: 452 code = PRC_HOSTDEAD; 453 break; 454#ifdef COMPAT_RFC1885 455 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 456 code = PRC_UNREACH_SRCFAIL; 457 break; 458#else 459 case ICMP6_DST_UNREACH_BEYONDSCOPE: 460 /* I mean "source address was incorrect." */ 461 code = PRC_PARAMPROB; 462 break; 463#endif 464 case ICMP6_DST_UNREACH_NOPORT: 465 code = PRC_UNREACH_PORT; 466 break; 467 default: 468 goto badcode; 469 } 470 goto deliver; 471 break; 472 473 case ICMP6_PACKET_TOO_BIG: 474 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 475 if (code != 0) 476 goto badcode; 477 478 code = PRC_MSGSIZE; 479 480 /* 481 * Updating the path MTU will be done after examining 482 * intermediate extension headers. 483 */ 484 goto deliver; 485 break; 486 487 case ICMP6_TIME_EXCEEDED: 488 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 489 switch (code) { 490 case ICMP6_TIME_EXCEED_TRANSIT: 491 case ICMP6_TIME_EXCEED_REASSEMBLY: 492 code += PRC_TIMXCEED_INTRANS; 493 break; 494 default: 495 goto badcode; 496 } 497 goto deliver; 498 break; 499 500 case ICMP6_PARAM_PROB: 501 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 502 switch (code) { 503 case ICMP6_PARAMPROB_NEXTHEADER: 504 code = PRC_UNREACH_PROTOCOL; 505 break; 506 case ICMP6_PARAMPROB_HEADER: 507 case ICMP6_PARAMPROB_OPTION: 508 code = PRC_PARAMPROB; 509 break; 510 default: 511 goto badcode; 512 } 513 goto deliver; 514 break; 515 516 case ICMP6_ECHO_REQUEST: 517 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 518 if (code != 0) 519 goto badcode; 520 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 521 /* Give up remote */ 522 break; 523 } 524 if ((n->m_flags & M_EXT) != 0 525 || n->m_len < off + sizeof(struct icmp6_hdr)) { 526 struct mbuf *n0 = n; 527 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 528 int n0len; 529 530 /* 531 * Prepare an internal mbuf. m_pullup() doesn't 532 * always copy the length we specified. 533 */ 534 if (maxlen >= MCLBYTES) { 535 /* Give up remote */ 536 m_freem(n0); 537 break; 538 } 539 MGETHDR(n, M_DONTWAIT, n0->m_type); 540 n0len = n0->m_pkthdr.len; /* save for use below */ 541 if (n) 542 M_MOVE_PKTHDR(n, n0); 543 if (n && maxlen >= MHLEN) { 544 MCLGET(n, M_DONTWAIT); 545 if ((n->m_flags & M_EXT) == 0) { 546 m_free(n); 547 n = NULL; 548 } 549 } 550 if (n == NULL) { 551 /* Give up remote */ 552 m_freem(n0); 553 break; 554 } 555 /* 556 * Copy IPv6 and ICMPv6 only. 557 */ 558 nip6 = mtod(n, struct ip6_hdr *); 559 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 560 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 561 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 562 noff = sizeof(struct ip6_hdr); 563 /* new mbuf contains only ipv6+icmpv6 headers */ 564 n->m_len = noff + sizeof(struct icmp6_hdr); 565 /* 566 * Adjust mbuf. ip6_plen will be adjusted in 567 * ip6_output(). 568 */ 569 m_adj(n0, off + sizeof(struct icmp6_hdr)); 570 /* recalculate complete packet size */ 571 n->m_pkthdr.len = n0len + (noff - off); 572 n->m_next = n0; 573 } else { 574 nip6 = mtod(n, struct ip6_hdr *); 575 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 576 noff = off; 577 } 578 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 579 nicmp6->icmp6_code = 0; 580 if (n) { 581 icmp6stat.icp6s_reflect++; 582 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 583 icmp6_reflect(n, noff); 584 } 585 break; 586 587 case ICMP6_ECHO_REPLY: 588 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 589 if (code != 0) 590 goto badcode; 591 break; 592 593 case MLD_LISTENER_QUERY: 594 case MLD_LISTENER_REPORT: 595 if (icmp6len < sizeof(struct mld_hdr)) 596 goto badlen; 597 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 598 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 599 else 600 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 601 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 602 /* give up local */ 603 mld6_input(m, off); 604 m = NULL; 605 goto freeit; 606 } 607 mld6_input(n, off); 608 /* m stays. */ 609 break; 610 611 case MLD_LISTENER_DONE: 612 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 613 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 614 goto badlen; 615 break; /* nothing to be done in kernel */ 616 617 case MLD_MTRACE_RESP: 618 case MLD_MTRACE: 619 /* XXX: these two are experimental. not officially defined. */ 620 /* XXX: per-interface statistics? */ 621 break; /* just pass it to applications */ 622 623 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 624 { 625 enum { WRU, FQDN } mode; 626 627 if (!icmp6_nodeinfo) 628 break; 629 630 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 631 mode = WRU; 632 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 633 mode = FQDN; 634 else 635 goto badlen; 636 637#define hostnamelen strlen(hostname) 638 if (mode == FQDN) { 639#ifndef PULLDOWN_TEST 640 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 641 IPPROTO_DONE); 642#endif 643 n = m_copy(m, 0, M_COPYALL); 644 if (n) 645 n = ni6_input(n, off); 646 /* XXX meaningless if n == NULL */ 647 noff = sizeof(struct ip6_hdr); 648 } else { 649 u_char *p; 650 int maxlen, maxhlen; 651 652 if ((icmp6_nodeinfo & 5) != 5) 653 break; 654 655 if (code != 0) 656 goto badcode; 657 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 658 if (maxlen >= MCLBYTES) { 659 /* Give up remote */ 660 break; 661 } 662 MGETHDR(n, M_DONTWAIT, m->m_type); 663 if (n && maxlen > MHLEN) { 664 MCLGET(n, M_DONTWAIT); 665 if ((n->m_flags & M_EXT) == 0) { 666 m_free(n); 667 n = NULL; 668 } 669 } 670 if (!m_dup_pkthdr(n, m, M_DONTWAIT)) { 671 /* 672 * Previous code did a blind M_COPY_PKTHDR 673 * and said "just for rcvif". If true, then 674 * we could tolerate the dup failing (due to 675 * the deep copy of the tag chain). For now 676 * be conservative and just fail. 677 */ 678 m_free(n); 679 n = NULL; 680 } 681 if (n == NULL) { 682 /* Give up remote */ 683 break; 684 } 685 n->m_pkthdr.rcvif = NULL; 686 n->m_len = 0; 687 maxhlen = M_TRAILINGSPACE(n) - maxlen; 688 if (maxhlen > hostnamelen) 689 maxhlen = hostnamelen; 690 /* 691 * Copy IPv6 and ICMPv6 only. 692 */ 693 nip6 = mtod(n, struct ip6_hdr *); 694 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 695 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 696 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 697 p = (u_char *)(nicmp6 + 1); 698 bzero(p, 4); 699 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 700 noff = sizeof(struct ip6_hdr); 701 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 702 sizeof(struct icmp6_hdr) + 4 + maxhlen; 703 nicmp6->icmp6_type = ICMP6_WRUREPLY; 704 nicmp6->icmp6_code = 0; 705 } 706#undef hostnamelen 707 if (n) { 708 icmp6stat.icp6s_reflect++; 709 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 710 icmp6_reflect(n, noff); 711 } 712 break; 713 } 714 715 case ICMP6_WRUREPLY: 716 if (code != 0) 717 goto badcode; 718 break; 719 720 case ND_ROUTER_SOLICIT: 721 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 722 if (code != 0) 723 goto badcode; 724 if (icmp6len < sizeof(struct nd_router_solicit)) 725 goto badlen; 726 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 727 /* give up local */ 728 nd6_rs_input(m, off, icmp6len); 729 m = NULL; 730 goto freeit; 731 } 732 nd6_rs_input(n, off, icmp6len); 733 /* m stays. */ 734 break; 735 736 case ND_ROUTER_ADVERT: 737 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 738 if (code != 0) 739 goto badcode; 740 if (icmp6len < sizeof(struct nd_router_advert)) 741 goto badlen; 742 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 743 /* give up local */ 744 nd6_ra_input(m, off, icmp6len); 745 m = NULL; 746 goto freeit; 747 } 748 nd6_ra_input(n, off, icmp6len); 749 /* m stays. */ 750 break; 751 752 case ND_NEIGHBOR_SOLICIT: 753 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 754 if (code != 0) 755 goto badcode; 756 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 757 goto badlen; 758 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 759 /* give up local */ 760 nd6_ns_input(m, off, icmp6len); 761 m = NULL; 762 goto freeit; 763 } 764 nd6_ns_input(n, off, icmp6len); 765 /* m stays. */ 766 break; 767 768 case ND_NEIGHBOR_ADVERT: 769 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 770 if (code != 0) 771 goto badcode; 772 if (icmp6len < sizeof(struct nd_neighbor_advert)) 773 goto badlen; 774 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 775 /* give up local */ 776 nd6_na_input(m, off, icmp6len); 777 m = NULL; 778 goto freeit; 779 } 780 nd6_na_input(n, off, icmp6len); 781 /* m stays. */ 782 break; 783 784 case ND_REDIRECT: 785 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 786 if (code != 0) 787 goto badcode; 788 if (icmp6len < sizeof(struct nd_redirect)) 789 goto badlen; 790 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 791 /* give up local */ 792 icmp6_redirect_input(m, off); 793 m = NULL; 794 goto freeit; 795 } 796 icmp6_redirect_input(n, off); 797 /* m stays. */ 798 break; 799 800 case ICMP6_ROUTER_RENUMBERING: 801 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 802 code != ICMP6_ROUTER_RENUMBERING_RESULT) 803 goto badcode; 804 if (icmp6len < sizeof(struct icmp6_router_renum)) 805 goto badlen; 806 break; 807 808 default: 809 nd6log((LOG_DEBUG, 810 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 811 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 812 ip6_sprintf(&ip6->ip6_dst), 813 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 814 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 815 /* ICMPv6 error: MUST deliver it by spec... */ 816 code = PRC_NCMDS; 817 /* deliver */ 818 } else { 819 /* ICMPv6 informational: MUST not deliver */ 820 break; 821 } 822 deliver: 823 if (icmp6_notify_error(m, off, icmp6len, code)) { 824 /* In this case, m should've been freed. */ 825 return (IPPROTO_DONE); 826 } 827 break; 828 829 badcode: 830 icmp6stat.icp6s_badcode++; 831 break; 832 833 badlen: 834 icmp6stat.icp6s_badlen++; 835 break; 836 } 837 838 /* deliver the packet to appropriate sockets */ 839 icmp6_rip6_input(&m, *offp); 840 841 return IPPROTO_DONE; 842 843 freeit: 844 m_freem(m); 845 return IPPROTO_DONE; 846} 847 848static int 849icmp6_notify_error(m, off, icmp6len, code) 850 struct mbuf *m; 851 int off, icmp6len, code; 852{ 853 struct icmp6_hdr *icmp6; 854 struct ip6_hdr *eip6; 855 u_int32_t notifymtu; 856 struct sockaddr_in6 icmp6src, icmp6dst; 857 858 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 859 icmp6stat.icp6s_tooshort++; 860 goto freeit; 861 } 862#ifndef PULLDOWN_TEST 863 IP6_EXTHDR_CHECK(m, off, 864 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1); 865 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 866#else 867 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 868 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 869 if (icmp6 == NULL) { 870 icmp6stat.icp6s_tooshort++; 871 return (-1); 872 } 873#endif 874 eip6 = (struct ip6_hdr *)(icmp6 + 1); 875 876 /* Detect the upper level protocol */ 877 { 878 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 879 u_int8_t nxt = eip6->ip6_nxt; 880 int eoff = off + sizeof(struct icmp6_hdr) + 881 sizeof(struct ip6_hdr); 882 struct ip6ctlparam ip6cp; 883 struct in6_addr *finaldst = NULL; 884 int icmp6type = icmp6->icmp6_type; 885 struct ip6_frag *fh; 886 struct ip6_rthdr *rth; 887 struct ip6_rthdr0 *rth0; 888 int rthlen; 889 890 while (1) { /* XXX: should avoid infinite loop explicitly? */ 891 struct ip6_ext *eh; 892 893 switch (nxt) { 894 case IPPROTO_HOPOPTS: 895 case IPPROTO_DSTOPTS: 896 case IPPROTO_AH: 897#ifndef PULLDOWN_TEST 898 IP6_EXTHDR_CHECK(m, 0, 899 eoff + sizeof(struct ip6_ext), -1); 900 eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff); 901#else 902 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 903 eoff, sizeof(*eh)); 904 if (eh == NULL) { 905 icmp6stat.icp6s_tooshort++; 906 return (-1); 907 } 908#endif 909 910 if (nxt == IPPROTO_AH) 911 eoff += (eh->ip6e_len + 2) << 2; 912 else 913 eoff += (eh->ip6e_len + 1) << 3; 914 nxt = eh->ip6e_nxt; 915 break; 916 case IPPROTO_ROUTING: 917 /* 918 * When the erroneous packet contains a 919 * routing header, we should examine the 920 * header to determine the final destination. 921 * Otherwise, we can't properly update 922 * information that depends on the final 923 * destination (e.g. path MTU). 924 */ 925#ifndef PULLDOWN_TEST 926 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1); 927 rth = (struct ip6_rthdr *) 928 (mtod(m, caddr_t) + eoff); 929#else 930 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 931 eoff, sizeof(*rth)); 932 if (rth == NULL) { 933 icmp6stat.icp6s_tooshort++; 934 return (-1); 935 } 936#endif 937 rthlen = (rth->ip6r_len + 1) << 3; 938 /* 939 * XXX: currently there is no 940 * officially defined type other 941 * than type-0. 942 * Note that if the segment left field 943 * is 0, all intermediate hops must 944 * have been passed. 945 */ 946 if (rth->ip6r_segleft && 947 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 948 int hops; 949 950#ifndef PULLDOWN_TEST 951 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1); 952 rth0 = (struct ip6_rthdr0 *) 953 (mtod(m, caddr_t) + eoff); 954#else 955 IP6_EXTHDR_GET(rth0, 956 struct ip6_rthdr0 *, m, 957 eoff, rthlen); 958 if (rth0 == NULL) { 959 icmp6stat.icp6s_tooshort++; 960 return (-1); 961 } 962#endif 963 /* just ignore a bogus header */ 964 if ((rth0->ip6r0_len % 2) == 0 && 965 (hops = rth0->ip6r0_len/2)) 966 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 967 } 968 eoff += rthlen; 969 nxt = rth->ip6r_nxt; 970 break; 971 case IPPROTO_FRAGMENT: 972#ifndef PULLDOWN_TEST 973 IP6_EXTHDR_CHECK(m, 0, eoff + 974 sizeof(struct ip6_frag), -1); 975 fh = (struct ip6_frag *)(mtod(m, caddr_t) + 976 eoff); 977#else 978 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 979 eoff, sizeof(*fh)); 980 if (fh == NULL) { 981 icmp6stat.icp6s_tooshort++; 982 return (-1); 983 } 984#endif 985 /* 986 * Data after a fragment header is meaningless 987 * unless it is the first fragment, but 988 * we'll go to the notify label for path MTU 989 * discovery. 990 */ 991 if (fh->ip6f_offlg & IP6F_OFF_MASK) 992 goto notify; 993 994 eoff += sizeof(struct ip6_frag); 995 nxt = fh->ip6f_nxt; 996 break; 997 default: 998 /* 999 * This case includes ESP and the No Next 1000 * Header. In such cases going to the notify 1001 * label does not have any meaning 1002 * (i.e. ctlfunc will be NULL), but we go 1003 * anyway since we might have to update 1004 * path MTU information. 1005 */ 1006 goto notify; 1007 } 1008 } 1009 notify: 1010#ifndef PULLDOWN_TEST 1011 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 1012#else 1013 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1014 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1015 if (icmp6 == NULL) { 1016 icmp6stat.icp6s_tooshort++; 1017 return (-1); 1018 } 1019#endif 1020 1021 /* 1022 * retrieve parameters from the inner IPv6 header, and convert 1023 * them into sockaddr structures. 1024 * XXX: there is no guarantee that the source or destination 1025 * addresses of the inner packet are in the same scope as 1026 * the addresses of the icmp packet. But there is no other 1027 * way to determine the zone. 1028 */ 1029 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1030 1031 bzero(&icmp6dst, sizeof(icmp6dst)); 1032 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1033 icmp6dst.sin6_family = AF_INET6; 1034 if (finaldst == NULL) 1035 icmp6dst.sin6_addr = eip6->ip6_dst; 1036 else 1037 icmp6dst.sin6_addr = *finaldst; 1038 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6dst.sin6_addr, 1039 &icmp6dst.sin6_scope_id)) 1040 goto freeit; 1041 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 1042 NULL, NULL)) { 1043 /* should be impossbile */ 1044 nd6log((LOG_DEBUG, 1045 "icmp6_notify_error: in6_embedscope failed\n")); 1046 goto freeit; 1047 } 1048 1049 /* 1050 * retrieve parameters from the inner IPv6 header, and convert 1051 * them into sockaddr structures. 1052 */ 1053 bzero(&icmp6src, sizeof(icmp6src)); 1054 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1055 icmp6src.sin6_family = AF_INET6; 1056 icmp6src.sin6_addr = eip6->ip6_src; 1057 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6src.sin6_addr, 1058 &icmp6src.sin6_scope_id)) { 1059 goto freeit; 1060 } 1061 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 1062 NULL, NULL)) { 1063 /* should be impossbile */ 1064 nd6log((LOG_DEBUG, 1065 "icmp6_notify_error: in6_embedscope failed\n")); 1066 goto freeit; 1067 } 1068 icmp6src.sin6_flowinfo = (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1069 1070 if (finaldst == NULL) 1071 finaldst = &eip6->ip6_dst; 1072 ip6cp.ip6c_m = m; 1073 ip6cp.ip6c_icmp6 = icmp6; 1074 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1075 ip6cp.ip6c_off = eoff; 1076 ip6cp.ip6c_finaldst = finaldst; 1077 ip6cp.ip6c_src = &icmp6src; 1078 ip6cp.ip6c_nxt = nxt; 1079 1080 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1081 notifymtu = ntohl(icmp6->icmp6_mtu); 1082 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1083 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 1084 } 1085 1086 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 1087 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1088 if (ctlfunc) { 1089 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1090 &ip6cp); 1091 } 1092 } 1093 return (0); 1094 1095 freeit: 1096 m_freem(m); 1097 return (-1); 1098} 1099 1100void 1101icmp6_mtudisc_update(ip6cp, validated) 1102 struct ip6ctlparam *ip6cp; 1103 int validated; 1104{ 1105 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1106 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1107 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1108 u_int mtu = ntohl(icmp6->icmp6_mtu); 1109 struct rtentry *rt = NULL; 1110 struct sockaddr_in6 sin6; 1111 1112#if 0 1113 /* 1114 * RFC2460 section 5, last paragraph. 1115 * even though minimum link MTU for IPv6 is IPV6_MMTU, 1116 * we may see ICMPv6 too big with mtu < IPV6_MMTU 1117 * due to packet translator in the middle. 1118 * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for 1119 * special handling. 1120 */ 1121 if (mtu < IPV6_MMTU) 1122 return; 1123#endif 1124 1125 /* 1126 * we reject ICMPv6 too big with abnormally small value. 1127 * XXX what is the good definition of "abnormally small"? 1128 */ 1129 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1130 return; 1131 1132 if (!validated) 1133 return; 1134 1135 bzero(&sin6, sizeof(sin6)); 1136 sin6.sin6_family = PF_INET6; 1137 sin6.sin6_len = sizeof(struct sockaddr_in6); 1138 sin6.sin6_addr = *dst; 1139 /* XXX normally, this won't happen */ 1140 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1141 sin6.sin6_addr.s6_addr16[1] = 1142 htons(m->m_pkthdr.rcvif->if_index); 1143 } 1144 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1145 rt = rtalloc1((struct sockaddr *)&sin6, 0, 1146 RTF_CLONING | RTF_PRCLONING); 1147 1148 if (rt && (rt->rt_flags & RTF_HOST) && 1149 !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 1150 if (mtu < IPV6_MMTU) { 1151 /* xxx */ 1152 rt->rt_rmx.rmx_locks |= RTV_MTU; 1153 } else if (mtu < rt->rt_ifp->if_mtu && 1154 rt->rt_rmx.rmx_mtu > mtu) { 1155 icmp6stat.icp6s_pmtuchg++; 1156 rt->rt_rmx.rmx_mtu = mtu; 1157 } 1158 } 1159 if (rt) 1160 rtfree(rt); 1161} 1162 1163/* 1164 * Process a Node Information Query packet, based on 1165 * draft-ietf-ipngwg-icmp-name-lookups-07. 1166 * 1167 * Spec incompatibilities: 1168 * - IPv6 Subject address handling 1169 * - IPv4 Subject address handling support missing 1170 * - Proxy reply (answer even if it's not for me) 1171 * - joins NI group address at in6_ifattach() time only, does not cope 1172 * with hostname changes by sethostname(3) 1173 */ 1174#define hostnamelen strlen(hostname) 1175static struct mbuf * 1176ni6_input(m, off) 1177 struct mbuf *m; 1178 int off; 1179{ 1180 struct icmp6_nodeinfo *ni6, *nni6; 1181 struct mbuf *n = NULL; 1182 u_int16_t qtype; 1183 int subjlen; 1184 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1185 struct ni_reply_fqdn *fqdn; 1186 int addrs; /* for NI_QTYPE_NODEADDR */ 1187 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1188 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1189 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */ 1190 struct ip6_hdr *ip6; 1191 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1192 char *subj = NULL; 1193 struct in6_ifaddr *ia6 = NULL; 1194 1195 ip6 = mtod(m, struct ip6_hdr *); 1196#ifndef PULLDOWN_TEST 1197 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1198#else 1199 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1200 if (ni6 == NULL) { 1201 /* m is already reclaimed */ 1202 return (NULL); 1203 } 1204#endif 1205 1206 /* 1207 * Validate IPv6 destination address. 1208 * 1209 * The Responder must discard the Query without further processing 1210 * unless it is one of the Responder's unicast or anycast addresses, or 1211 * a link-local scope multicast address which the Responder has joined. 1212 * [icmp-name-lookups-07, Section 4.] 1213 */ 1214 bzero(&sin6, sizeof(sin6)); 1215 sin6.sin6_family = AF_INET6; 1216 sin6.sin6_len = sizeof(struct sockaddr_in6); 1217 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1218 /* XXX scopeid */ 1219 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) { 1220 /* unicast/anycast, fine */ 1221 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1222 (icmp6_nodeinfo & 4) == 0) { 1223 nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 1224 "a temporary address in %s:%d", 1225 __FILE__, __LINE__)); 1226 goto bad; 1227 } 1228 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1229 ; /* link-local multicast, fine */ 1230 else 1231 goto bad; 1232 1233 /* validate query Subject field. */ 1234 qtype = ntohs(ni6->ni_qtype); 1235 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1236 switch (qtype) { 1237 case NI_QTYPE_NOOP: 1238 case NI_QTYPE_SUPTYPES: 1239 /* 07 draft */ 1240 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1241 break; 1242 /* FALLTHROUGH */ 1243 case NI_QTYPE_FQDN: 1244 case NI_QTYPE_NODEADDR: 1245 switch (ni6->ni_code) { 1246 case ICMP6_NI_SUBJ_IPV6: 1247#if ICMP6_NI_SUBJ_IPV6 != 0 1248 case 0: 1249#endif 1250 /* 1251 * backward compatibility - try to accept 03 draft 1252 * format, where no Subject is present. 1253 */ 1254 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1255 subjlen == 0) { 1256 oldfqdn++; 1257 break; 1258 } 1259#if ICMP6_NI_SUBJ_IPV6 != 0 1260 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1261 goto bad; 1262#endif 1263 1264 if (subjlen != sizeof(sin6.sin6_addr)) 1265 goto bad; 1266 1267 /* 1268 * Validate Subject address. 1269 * 1270 * Not sure what exactly "address belongs to the node" 1271 * means in the spec, is it just unicast, or what? 1272 * 1273 * At this moment we consider Subject address as 1274 * "belong to the node" if the Subject address equals 1275 * to the IPv6 destination address; validation for 1276 * IPv6 destination address should have done enough 1277 * check for us. 1278 * 1279 * We do not do proxy at this moment. 1280 */ 1281 /* m_pulldown instead of copy? */ 1282 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1283 subjlen, (caddr_t)&sin6.sin6_addr); 1284 if (in6_addr2zoneid(m->m_pkthdr.rcvif, 1285 &sin6.sin6_addr, &sin6.sin6_scope_id)) { 1286 goto bad; 1287 } 1288 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL); 1289 bzero(&sin6_d, sizeof(sin6_d)); 1290 sin6_d.sin6_family = AF_INET6; /* not used, actually */ 1291 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */ 1292 sin6_d.sin6_addr = ip6->ip6_dst; 1293 if (in6_addr2zoneid(m->m_pkthdr.rcvif, 1294 &ip6->ip6_dst, &sin6_d.sin6_scope_id)) { 1295 goto bad; 1296 } 1297 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL); 1298 subj = (char *)&sin6; 1299 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) 1300 break; 1301 1302 /* 1303 * XXX if we are to allow other cases, we should really 1304 * be careful about scope here. 1305 * basically, we should disallow queries toward IPv6 1306 * destination X with subject Y, 1307 * if scope(X) > scope(Y). 1308 * if we allow scope(X) > scope(Y), it will result in 1309 * information leakage across scope boundary. 1310 */ 1311 goto bad; 1312 1313 case ICMP6_NI_SUBJ_FQDN: 1314 /* 1315 * Validate Subject name with gethostname(3). 1316 * 1317 * The behavior may need some debate, since: 1318 * - we are not sure if the node has FQDN as 1319 * hostname (returned by gethostname(3)). 1320 * - the code does wildcard match for truncated names. 1321 * however, we are not sure if we want to perform 1322 * wildcard match, if gethostname(3) side has 1323 * truncated hostname. 1324 */ 1325 n = ni6_nametodns(hostname, hostnamelen, 0); 1326 if (!n || n->m_next || n->m_len == 0) 1327 goto bad; 1328 IP6_EXTHDR_GET(subj, char *, m, 1329 off + sizeof(struct icmp6_nodeinfo), subjlen); 1330 if (subj == NULL) 1331 goto bad; 1332 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1333 n->m_len)) { 1334 goto bad; 1335 } 1336 m_freem(n); 1337 n = NULL; 1338 break; 1339 1340 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1341 default: 1342 goto bad; 1343 } 1344 break; 1345 } 1346 1347 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1348 switch (qtype) { 1349 case NI_QTYPE_FQDN: 1350 if ((icmp6_nodeinfo & 1) == 0) 1351 goto bad; 1352 break; 1353 case NI_QTYPE_NODEADDR: 1354 if ((icmp6_nodeinfo & 2) == 0) 1355 goto bad; 1356 break; 1357 } 1358 1359 /* guess reply length */ 1360 switch (qtype) { 1361 case NI_QTYPE_NOOP: 1362 break; /* no reply data */ 1363 case NI_QTYPE_SUPTYPES: 1364 replylen += sizeof(u_int32_t); 1365 break; 1366 case NI_QTYPE_FQDN: 1367 /* XXX will append an mbuf */ 1368 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1369 break; 1370 case NI_QTYPE_NODEADDR: 1371 addrs = ni6_addrs(ni6, m, &ifp, subj); 1372 if ((replylen += addrs * (sizeof(struct in6_addr) + 1373 sizeof(u_int32_t))) > MCLBYTES) 1374 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1375 break; 1376 default: 1377 /* 1378 * XXX: We must return a reply with the ICMP6 code 1379 * `unknown Qtype' in this case. However we regard the case 1380 * as an FQDN query for backward compatibility. 1381 * Older versions set a random value to this field, 1382 * so it rarely varies in the defined qtypes. 1383 * But the mechanism is not reliable... 1384 * maybe we should obsolete older versions. 1385 */ 1386 qtype = NI_QTYPE_FQDN; 1387 /* XXX will append an mbuf */ 1388 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1389 oldfqdn++; 1390 break; 1391 } 1392 1393 /* allocate an mbuf to reply. */ 1394 MGETHDR(n, M_DONTWAIT, m->m_type); 1395 if (n == NULL) { 1396 m_freem(m); 1397 return (NULL); 1398 } 1399 M_MOVE_PKTHDR(n, m); /* just for recvif */ 1400 if (replylen > MHLEN) { 1401 if (replylen > MCLBYTES) { 1402 /* 1403 * XXX: should we try to allocate more? But MCLBYTES 1404 * is probably much larger than IPV6_MMTU... 1405 */ 1406 goto bad; 1407 } 1408 MCLGET(n, M_DONTWAIT); 1409 if ((n->m_flags & M_EXT) == 0) { 1410 goto bad; 1411 } 1412 } 1413 n->m_pkthdr.len = n->m_len = replylen; 1414 1415 /* copy mbuf header and IPv6 + Node Information base headers */ 1416 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1417 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1418 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1419 1420 /* qtype dependent procedure */ 1421 switch (qtype) { 1422 case NI_QTYPE_NOOP: 1423 nni6->ni_code = ICMP6_NI_SUCCESS; 1424 nni6->ni_flags = 0; 1425 break; 1426 case NI_QTYPE_SUPTYPES: 1427 { 1428 u_int32_t v; 1429 nni6->ni_code = ICMP6_NI_SUCCESS; 1430 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1431 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1432 v = (u_int32_t)htonl(0x0000000f); 1433 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1434 break; 1435 } 1436 case NI_QTYPE_FQDN: 1437 nni6->ni_code = ICMP6_NI_SUCCESS; 1438 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1439 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 1440 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1441 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1442 /* 1443 * XXX do we really have FQDN in variable "hostname"? 1444 */ 1445 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1446 if (n->m_next == NULL) 1447 goto bad; 1448 /* XXX we assume that n->m_next is not a chain */ 1449 if (n->m_next->m_next != NULL) 1450 goto bad; 1451 n->m_pkthdr.len += n->m_next->m_len; 1452 break; 1453 case NI_QTYPE_NODEADDR: 1454 { 1455 int lenlim, copied; 1456 1457 nni6->ni_code = ICMP6_NI_SUCCESS; 1458 n->m_pkthdr.len = n->m_len = 1459 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1460 lenlim = M_TRAILINGSPACE(n); 1461 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1462 /* XXX: reset mbuf length */ 1463 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1464 sizeof(struct icmp6_nodeinfo) + copied; 1465 break; 1466 } 1467 default: 1468 break; /* XXX impossible! */ 1469 } 1470 1471 nni6->ni_type = ICMP6_NI_REPLY; 1472 m_freem(m); 1473 return (n); 1474 1475 bad: 1476 m_freem(m); 1477 if (n) 1478 m_freem(n); 1479 return (NULL); 1480} 1481#undef hostnamelen 1482 1483/* 1484 * make a mbuf with DNS-encoded string. no compression support. 1485 * 1486 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1487 * treated as truncated name (two \0 at the end). this is a wild guess. 1488 */ 1489static struct mbuf * 1490ni6_nametodns(name, namelen, old) 1491 const char *name; 1492 int namelen; 1493 int old; /* return pascal string if non-zero */ 1494{ 1495 struct mbuf *m; 1496 char *cp, *ep; 1497 const char *p, *q; 1498 int i, len, nterm; 1499 1500 if (old) 1501 len = namelen + 1; 1502 else 1503 len = MCLBYTES; 1504 1505 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1506 MGET(m, M_DONTWAIT, MT_DATA); 1507 if (m && len > MLEN) { 1508 MCLGET(m, M_DONTWAIT); 1509 if ((m->m_flags & M_EXT) == 0) 1510 goto fail; 1511 } 1512 if (!m) 1513 goto fail; 1514 m->m_next = NULL; 1515 1516 if (old) { 1517 m->m_len = len; 1518 *mtod(m, char *) = namelen; 1519 bcopy(name, mtod(m, char *) + 1, namelen); 1520 return m; 1521 } else { 1522 m->m_len = 0; 1523 cp = mtod(m, char *); 1524 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1525 1526 /* if not certain about my name, return empty buffer */ 1527 if (namelen == 0) 1528 return m; 1529 1530 /* 1531 * guess if it looks like shortened hostname, or FQDN. 1532 * shortened hostname needs two trailing "\0". 1533 */ 1534 i = 0; 1535 for (p = name; p < name + namelen; p++) { 1536 if (*p && *p == '.') 1537 i++; 1538 } 1539 if (i < 2) 1540 nterm = 2; 1541 else 1542 nterm = 1; 1543 1544 p = name; 1545 while (cp < ep && p < name + namelen) { 1546 i = 0; 1547 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1548 i++; 1549 /* result does not fit into mbuf */ 1550 if (cp + i + 1 >= ep) 1551 goto fail; 1552 /* 1553 * DNS label length restriction, RFC1035 page 8. 1554 * "i == 0" case is included here to avoid returning 1555 * 0-length label on "foo..bar". 1556 */ 1557 if (i <= 0 || i >= 64) 1558 goto fail; 1559 *cp++ = i; 1560 bcopy(p, cp, i); 1561 cp += i; 1562 p = q; 1563 if (p < name + namelen && *p == '.') 1564 p++; 1565 } 1566 /* termination */ 1567 if (cp + nterm >= ep) 1568 goto fail; 1569 while (nterm-- > 0) 1570 *cp++ = '\0'; 1571 m->m_len = cp - mtod(m, char *); 1572 return m; 1573 } 1574 1575 panic("should not reach here"); 1576 /* NOTREACHED */ 1577 1578 fail: 1579 if (m) 1580 m_freem(m); 1581 return NULL; 1582} 1583 1584/* 1585 * check if two DNS-encoded string matches. takes care of truncated 1586 * form (with \0\0 at the end). no compression support. 1587 * XXX upper/lowercase match (see RFC2065) 1588 */ 1589static int 1590ni6_dnsmatch(a, alen, b, blen) 1591 const char *a; 1592 int alen; 1593 const char *b; 1594 int blen; 1595{ 1596 const char *a0, *b0; 1597 int l; 1598 1599 /* simplest case - need validation? */ 1600 if (alen == blen && bcmp(a, b, alen) == 0) 1601 return 1; 1602 1603 a0 = a; 1604 b0 = b; 1605 1606 /* termination is mandatory */ 1607 if (alen < 2 || blen < 2) 1608 return 0; 1609 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1610 return 0; 1611 alen--; 1612 blen--; 1613 1614 while (a - a0 < alen && b - b0 < blen) { 1615 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1616 return 0; 1617 1618 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1619 return 0; 1620 /* we don't support compression yet */ 1621 if (a[0] >= 64 || b[0] >= 64) 1622 return 0; 1623 1624 /* truncated case */ 1625 if (a[0] == 0 && a - a0 == alen - 1) 1626 return 1; 1627 if (b[0] == 0 && b - b0 == blen - 1) 1628 return 1; 1629 if (a[0] == 0 || b[0] == 0) 1630 return 0; 1631 1632 if (a[0] != b[0]) 1633 return 0; 1634 l = a[0]; 1635 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1636 return 0; 1637 if (bcmp(a + 1, b + 1, l) != 0) 1638 return 0; 1639 1640 a += 1 + l; 1641 b += 1 + l; 1642 } 1643 1644 if (a - a0 == alen && b - b0 == blen) 1645 return 1; 1646 else 1647 return 0; 1648} 1649 1650/* 1651 * calculate the number of addresses to be returned in the node info reply. 1652 */ 1653static int 1654ni6_addrs(ni6, m, ifpp, subj) 1655 struct icmp6_nodeinfo *ni6; 1656 struct mbuf *m; 1657 struct ifnet **ifpp; 1658 char *subj; 1659{ 1660 struct ifnet *ifp; 1661 struct in6_ifaddr *ifa6; 1662 struct ifaddr *ifa; 1663 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1664 int addrs = 0, addrsofif, iffound = 0; 1665 int niflags = ni6->ni_flags; 1666 1667 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1668 switch (ni6->ni_code) { 1669 case ICMP6_NI_SUBJ_IPV6: 1670 if (subj == NULL) /* must be impossible... */ 1671 return (0); 1672 subj_ip6 = (struct sockaddr_in6 *)subj; 1673 break; 1674 default: 1675 /* 1676 * XXX: we only support IPv6 subject address for 1677 * this Qtype. 1678 */ 1679 return (0); 1680 } 1681 } 1682 1683 IFNET_RLOCK(); 1684 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 1685 addrsofif = 0; 1686 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1687 if (ifa->ifa_addr->sa_family != AF_INET6) 1688 continue; 1689 ifa6 = (struct in6_ifaddr *)ifa; 1690 1691 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1692 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1693 &ifa6->ia_addr.sin6_addr)) 1694 iffound = 1; 1695 1696 /* 1697 * IPv4-mapped addresses can only be returned by a 1698 * Node Information proxy, since they represent 1699 * addresses of IPv4-only nodes, which perforce do 1700 * not implement this protocol. 1701 * [icmp-name-lookups-07, Section 5.4] 1702 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1703 * this function at this moment. 1704 */ 1705 1706 /* What do we have to do about ::1? */ 1707 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1708 case IPV6_ADDR_SCOPE_LINKLOCAL: 1709 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1710 continue; 1711 break; 1712 case IPV6_ADDR_SCOPE_SITELOCAL: 1713 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1714 continue; 1715 break; 1716 case IPV6_ADDR_SCOPE_GLOBAL: 1717 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1718 continue; 1719 break; 1720 default: 1721 continue; 1722 } 1723 1724 /* 1725 * check if anycast is okay. 1726 * XXX: just experimental. not in the spec. 1727 */ 1728 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1729 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1730 continue; /* we need only unicast addresses */ 1731 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1732 (icmp6_nodeinfo & 4) == 0) { 1733 continue; 1734 } 1735 addrsofif++; /* count the address */ 1736 } 1737 if (iffound) { 1738 *ifpp = ifp; 1739 IFNET_RUNLOCK(); 1740 return (addrsofif); 1741 } 1742 1743 addrs += addrsofif; 1744 } 1745 IFNET_RUNLOCK(); 1746 1747 return (addrs); 1748} 1749 1750static int 1751ni6_store_addrs(ni6, nni6, ifp0, resid) 1752 struct icmp6_nodeinfo *ni6, *nni6; 1753 struct ifnet *ifp0; 1754 int resid; 1755{ 1756 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1757 struct in6_ifaddr *ifa6; 1758 struct ifaddr *ifa; 1759 struct ifnet *ifp_dep = NULL; 1760 int copied = 0, allow_deprecated = 0; 1761 u_char *cp = (u_char *)(nni6 + 1); 1762 int niflags = ni6->ni_flags; 1763 u_int32_t ltime; 1764 1765 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1766 return (0); /* needless to copy */ 1767 1768 IFNET_RLOCK(); 1769 again: 1770 1771 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 1772 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1773 ifa = ifa->ifa_list.tqe_next) { 1774 if (ifa->ifa_addr->sa_family != AF_INET6) 1775 continue; 1776 ifa6 = (struct in6_ifaddr *)ifa; 1777 1778 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1779 allow_deprecated == 0) { 1780 /* 1781 * prefererred address should be put before 1782 * deprecated addresses. 1783 */ 1784 1785 /* record the interface for later search */ 1786 if (ifp_dep == NULL) 1787 ifp_dep = ifp; 1788 1789 continue; 1790 } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1791 allow_deprecated != 0) 1792 continue; /* we now collect deprecated addrs */ 1793 1794 /* What do we have to do about ::1? */ 1795 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1796 case IPV6_ADDR_SCOPE_LINKLOCAL: 1797 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1798 continue; 1799 break; 1800 case IPV6_ADDR_SCOPE_SITELOCAL: 1801 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1802 continue; 1803 break; 1804 case IPV6_ADDR_SCOPE_GLOBAL: 1805 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1806 continue; 1807 break; 1808 default: 1809 continue; 1810 } 1811 1812 /* 1813 * check if anycast is okay. 1814 * XXX: just experimental. not in the spec. 1815 */ 1816 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1817 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1818 continue; 1819 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1820 (icmp6_nodeinfo & 4) == 0) { 1821 continue; 1822 } 1823 1824 /* now we can copy the address */ 1825 if (resid < sizeof(struct in6_addr) + 1826 sizeof(u_int32_t)) { 1827 /* 1828 * We give up much more copy. 1829 * Set the truncate flag and return. 1830 */ 1831 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1832 IFNET_RUNLOCK(); 1833 return (copied); 1834 } 1835 1836 /* 1837 * Set the TTL of the address. 1838 * The TTL value should be one of the following 1839 * according to the specification: 1840 * 1841 * 1. The remaining lifetime of a DHCP lease on the 1842 * address, or 1843 * 2. The remaining Valid Lifetime of a prefix from 1844 * which the address was derived through Stateless 1845 * Autoconfiguration. 1846 * 1847 * Note that we currently do not support stateful 1848 * address configuration by DHCPv6, so the former 1849 * case can't happen. 1850 */ 1851 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1852 ltime = ND6_INFINITE_LIFETIME; 1853 else { 1854 if (ifa6->ia6_lifetime.ia6t_expire > 1855 time_second) 1856 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second); 1857 else 1858 ltime = 0; 1859 } 1860 1861 bcopy(<ime, cp, sizeof(u_int32_t)); 1862 cp += sizeof(u_int32_t); 1863 1864 /* copy the address itself */ 1865 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1866 sizeof(struct in6_addr)); 1867 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1868 cp += sizeof(struct in6_addr); 1869 1870 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1871 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1872 } 1873 if (ifp0) /* we need search only on the specified IF */ 1874 break; 1875 } 1876 1877 if (allow_deprecated == 0 && ifp_dep != NULL) { 1878 ifp = ifp_dep; 1879 allow_deprecated = 1; 1880 1881 goto again; 1882 } 1883 1884 IFNET_RUNLOCK(); 1885 1886 return (copied); 1887} 1888 1889/* 1890 * XXX almost dup'ed code with rip6_input. 1891 */ 1892static int 1893icmp6_rip6_input(mp, off) 1894 struct mbuf **mp; 1895 int off; 1896{ 1897 struct mbuf *m = *mp; 1898 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1899 struct in6pcb *in6p; 1900 struct in6pcb *last = NULL; 1901 struct sockaddr_in6 fromsa; 1902 struct icmp6_hdr *icmp6; 1903 struct mbuf *opts = NULL; 1904 1905#ifndef PULLDOWN_TEST 1906 /* this is assumed to be safe. */ 1907 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1908#else 1909 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1910 if (icmp6 == NULL) { 1911 /* m is already reclaimed */ 1912 return (IPPROTO_DONE); 1913 } 1914#endif 1915 1916 bzero(&fromsa, sizeof(fromsa)); 1917 fromsa.sin6_len = sizeof(struct sockaddr_in6); 1918 fromsa.sin6_family = AF_INET6; 1919 /* KAME hack: recover scopeid */ 1920 (void)in6_recoverscope(&fromsa, &ip6->ip6_src, m->m_pkthdr.rcvif); 1921 1922 LIST_FOREACH(in6p, &ripcb, inp_list) { 1923 if ((in6p->inp_vflag & INP_IPV6) == 0) 1924 continue; 1925 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1926 continue; 1927 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1928 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1929 continue; 1930 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1931 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1932 continue; 1933 if (in6p->in6p_icmp6filt 1934 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1935 in6p->in6p_icmp6filt)) 1936 continue; 1937 if (last) { 1938 struct mbuf *n; 1939 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1940 if (last->in6p_flags & IN6P_CONTROLOPTS) 1941 ip6_savecontrol(last, &opts, ip6, n); 1942 /* strip intermediate headers */ 1943 m_adj(n, off); 1944 if (sbappendaddr(&last->in6p_socket->so_rcv, 1945 (struct sockaddr *)&fromsa, n, opts) 1946 == 0) { 1947 /* should notify about lost packet */ 1948 m_freem(n); 1949 if (opts) { 1950 m_freem(opts); 1951 } 1952 } else 1953 sorwakeup(last->in6p_socket); 1954 opts = NULL; 1955 } 1956 } 1957 last = in6p; 1958 } 1959 if (last) { 1960 if (last->in6p_flags & IN6P_CONTROLOPTS) 1961 ip6_savecontrol(last, &opts, ip6, m); 1962 /* strip intermediate headers */ 1963 m_adj(m, off); 1964 if (sbappendaddr(&last->in6p_socket->so_rcv, 1965 (struct sockaddr *)&fromsa, m, opts) == 0) { 1966 m_freem(m); 1967 if (opts) 1968 m_freem(opts); 1969 } else 1970 sorwakeup(last->in6p_socket); 1971 } else { 1972 m_freem(m); 1973 ip6stat.ip6s_delivered--; 1974 } 1975 return IPPROTO_DONE; 1976} 1977 1978/* 1979 * Reflect the ip6 packet back to the source. 1980 * OFF points to the icmp6 header, counted from the top of the mbuf. 1981 */ 1982void 1983icmp6_reflect(m, off) 1984 struct mbuf *m; 1985 size_t off; 1986{ 1987 struct ip6_hdr *ip6; 1988 struct icmp6_hdr *icmp6; 1989 struct in6_ifaddr *ia; 1990 struct in6_addr t, *src = 0; 1991 int plen; 1992 int type, code; 1993 struct ifnet *outif = NULL; 1994 struct sockaddr_in6 sa6_src, sa6_dst; 1995#ifdef COMPAT_RFC1885 1996 int mtu = IPV6_MMTU; 1997 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 1998#endif 1999 2000 /* too short to reflect */ 2001 if (off < sizeof(struct ip6_hdr)) { 2002 nd6log((LOG_DEBUG, 2003 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2004 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2005 __FILE__, __LINE__)); 2006 goto bad; 2007 } 2008 2009 /* 2010 * If there are extra headers between IPv6 and ICMPv6, strip 2011 * off that header first. 2012 */ 2013#ifdef DIAGNOSTIC 2014 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2015 panic("assumption failed in icmp6_reflect"); 2016#endif 2017 if (off > sizeof(struct ip6_hdr)) { 2018 size_t l; 2019 struct ip6_hdr nip6; 2020 2021 l = off - sizeof(struct ip6_hdr); 2022 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2023 m_adj(m, l); 2024 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2025 if (m->m_len < l) { 2026 if ((m = m_pullup(m, l)) == NULL) 2027 return; 2028 } 2029 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2030 } else /* off == sizeof(struct ip6_hdr) */ { 2031 size_t l; 2032 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2033 if (m->m_len < l) { 2034 if ((m = m_pullup(m, l)) == NULL) 2035 return; 2036 } 2037 } 2038 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2039 ip6 = mtod(m, struct ip6_hdr *); 2040 ip6->ip6_nxt = IPPROTO_ICMPV6; 2041 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2042 type = icmp6->icmp6_type; /* keep type for statistics */ 2043 code = icmp6->icmp6_code; /* ditto. */ 2044 2045 t = ip6->ip6_dst; 2046 /* 2047 * ip6_input() drops a packet if its src is multicast. 2048 * So, the src is never multicast. 2049 */ 2050 ip6->ip6_dst = ip6->ip6_src; 2051 2052 /* 2053 * XXX: make sure to embed scope zone information, using 2054 * already embedded IDs or the received interface (if any). 2055 * Note that rcvif may be NULL. 2056 * TODO: scoped routing case (XXX). 2057 */ 2058 bzero(&sa6_src, sizeof(sa6_src)); 2059 sa6_src.sin6_family = AF_INET6; 2060 sa6_src.sin6_len = sizeof(sa6_src); 2061 sa6_src.sin6_addr = ip6->ip6_dst; 2062 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 2063 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL); 2064 bzero(&sa6_dst, sizeof(sa6_dst)); 2065 sa6_dst.sin6_family = AF_INET6; 2066 sa6_dst.sin6_len = sizeof(sa6_dst); 2067 sa6_dst.sin6_addr = t; 2068 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 2069 in6_embedscope(&t, &sa6_dst, NULL, NULL); 2070 2071#ifdef COMPAT_RFC1885 2072 /* 2073 * xxx guess MTU 2074 * RFC 1885 requires that echo reply should be truncated if it 2075 * does not fit in with (return) path MTU, but the description was 2076 * removed in the new spec. 2077 */ 2078 if (icmp6_reflect_rt.ro_rt == 0 || 2079 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 2080 if (icmp6_reflect_rt.ro_rt) { 2081 RTFREE(icmp6_reflect_rt.ro_rt); 2082 icmp6_reflect_rt.ro_rt = 0; 2083 } 2084 bzero(sin6, sizeof(*sin6)); 2085 sin6->sin6_family = PF_INET6; 2086 sin6->sin6_len = sizeof(struct sockaddr_in6); 2087 sin6->sin6_addr = ip6->ip6_dst; 2088 2089 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt, 2090 RTF_PRCLONING); 2091 } 2092 2093 if (icmp6_reflect_rt.ro_rt == 0) 2094 goto bad; 2095 2096 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 2097 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 2098 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 2099 2100 if (mtu < m->m_pkthdr.len) { 2101 plen -= (m->m_pkthdr.len - mtu); 2102 m_adj(m, mtu - m->m_pkthdr.len); 2103 } 2104#endif 2105 /* 2106 * If the incoming packet was addressed directly to us (i.e. unicast), 2107 * use dst as the src for the reply. 2108 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2109 * (for example) when we encounter an error while forwarding procedure 2110 * destined to a duplicated address of ours. 2111 */ 2112 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2113 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2114 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2115 src = &t; 2116 break; 2117 } 2118 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2119 /* 2120 * This is the case if the dst is our link-local address 2121 * and the sender is also ourselves. 2122 */ 2123 src = &t; 2124 } 2125 2126 if (src == 0) { 2127 int e; 2128 struct route_in6 ro; 2129 2130 /* 2131 * This case matches to multicasts, our anycast, or unicasts 2132 * that we do not own. Select a source address based on the 2133 * source address of the erroneous packet. 2134 */ 2135 bzero(&ro, sizeof(ro)); 2136 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); 2137 if (ro.ro_rt) 2138 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2139 if (src == NULL) { 2140 nd6log((LOG_DEBUG, 2141 "icmp6_reflect: source can't be determined: " 2142 "dst=%s, error=%d\n", 2143 ip6_sprintf(&sa6_src.sin6_addr), e)); 2144 goto bad; 2145 } 2146 } 2147 2148 ip6->ip6_src = *src; 2149 2150 ip6->ip6_flow = 0; 2151 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2152 ip6->ip6_vfc |= IPV6_VERSION; 2153 ip6->ip6_nxt = IPPROTO_ICMPV6; 2154 if (outif) 2155 ip6->ip6_hlim = ND_IFINFO(outif)->chlim; 2156 else if (m->m_pkthdr.rcvif) { 2157 /* XXX: This may not be the outgoing interface */ 2158 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 2159 } else 2160 ip6->ip6_hlim = ip6_defhlim; 2161 2162 icmp6->icmp6_cksum = 0; 2163 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2164 sizeof(struct ip6_hdr), plen); 2165 2166 /* 2167 * XXX option handling 2168 */ 2169 2170 m->m_flags &= ~(M_BCAST|M_MCAST); 2171 2172#ifdef COMPAT_RFC1885 2173 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL); 2174#else 2175 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2176#endif 2177 if (outif) 2178 icmp6_ifoutstat_inc(outif, type, code); 2179 2180 return; 2181 2182 bad: 2183 m_freem(m); 2184 return; 2185} 2186 2187void 2188icmp6_fasttimo() 2189{ 2190 2191 mld6_fasttimeo(); 2192} 2193 2194static const char * 2195icmp6_redirect_diag(src6, dst6, tgt6) 2196 struct in6_addr *src6; 2197 struct in6_addr *dst6; 2198 struct in6_addr *tgt6; 2199{ 2200 static char buf[1024]; 2201 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2202 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2203 return buf; 2204} 2205 2206void 2207icmp6_redirect_input(m, off) 2208 struct mbuf *m; 2209 int off; 2210{ 2211 struct ifnet *ifp = m->m_pkthdr.rcvif; 2212 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2213 struct nd_redirect *nd_rd; 2214 int icmp6len = ntohs(ip6->ip6_plen); 2215 char *lladdr = NULL; 2216 int lladdrlen = 0; 2217 u_char *redirhdr = NULL; 2218 int redirhdrlen = 0; 2219 struct rtentry *rt = NULL; 2220 int is_router; 2221 int is_onlink; 2222 struct in6_addr src6 = ip6->ip6_src; 2223 struct in6_addr redtgt6; 2224 struct in6_addr reddst6; 2225 union nd_opts ndopts; 2226 2227 if (!m || !ifp) 2228 return; 2229 2230 /* XXX if we are router, we don't update route by icmp6 redirect */ 2231 if (ip6_forwarding) 2232 goto freeit; 2233 if (!icmp6_rediraccept) 2234 goto freeit; 2235 2236#ifndef PULLDOWN_TEST 2237 IP6_EXTHDR_CHECK(m, off, icmp6len,); 2238 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2239#else 2240 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2241 if (nd_rd == NULL) { 2242 icmp6stat.icp6s_tooshort++; 2243 return; 2244 } 2245#endif 2246 redtgt6 = nd_rd->nd_rd_target; 2247 reddst6 = nd_rd->nd_rd_dst; 2248 2249 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2250 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2251 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2252 reddst6.s6_addr16[1] = htons(ifp->if_index); 2253 2254 /* validation */ 2255 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2256 nd6log((LOG_ERR, 2257 "ICMP6 redirect sent from %s rejected; " 2258 "must be from linklocal\n", 2259 ip6_sprintf(&src6))); 2260 goto bad; 2261 } 2262 if (ip6->ip6_hlim != 255) { 2263 nd6log((LOG_ERR, 2264 "ICMP6 redirect sent from %s rejected; " 2265 "hlim=%d (must be 255)\n", 2266 ip6_sprintf(&src6), ip6->ip6_hlim)); 2267 goto bad; 2268 } 2269 { 2270 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2271 struct sockaddr_in6 sin6; 2272 struct in6_addr *gw6; 2273 2274 bzero(&sin6, sizeof(sin6)); 2275 sin6.sin6_family = AF_INET6; 2276 sin6.sin6_len = sizeof(struct sockaddr_in6); 2277 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2278 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 2279 if (rt) { 2280 if (rt->rt_gateway == NULL || 2281 rt->rt_gateway->sa_family != AF_INET6) { 2282 nd6log((LOG_ERR, 2283 "ICMP6 redirect rejected; no route " 2284 "with inet6 gateway found for redirect dst: %s\n", 2285 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2286 RTFREE_LOCKED(rt); 2287 goto bad; 2288 } 2289 2290 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2291 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2292 nd6log((LOG_ERR, 2293 "ICMP6 redirect rejected; " 2294 "not equal to gw-for-src=%s (must be same): " 2295 "%s\n", 2296 ip6_sprintf(gw6), 2297 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2298 RTFREE_LOCKED(rt); 2299 goto bad; 2300 } 2301 } else { 2302 nd6log((LOG_ERR, 2303 "ICMP6 redirect rejected; " 2304 "no route found for redirect dst: %s\n", 2305 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2306 goto bad; 2307 } 2308 RTFREE_LOCKED(rt); 2309 rt = NULL; 2310 } 2311 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2312 nd6log((LOG_ERR, 2313 "ICMP6 redirect rejected; " 2314 "redirect dst must be unicast: %s\n", 2315 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2316 goto bad; 2317 } 2318 2319 is_router = is_onlink = 0; 2320 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2321 is_router = 1; /* router case */ 2322 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2323 is_onlink = 1; /* on-link destination case */ 2324 if (!is_router && !is_onlink) { 2325 nd6log((LOG_ERR, 2326 "ICMP6 redirect rejected; " 2327 "neither router case nor onlink case: %s\n", 2328 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2329 goto bad; 2330 } 2331 /* validation passed */ 2332 2333 icmp6len -= sizeof(*nd_rd); 2334 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2335 if (nd6_options(&ndopts) < 0) { 2336 nd6log((LOG_INFO, "icmp6_redirect_input: " 2337 "invalid ND option, rejected: %s\n", 2338 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2339 /* nd6_options have incremented stats */ 2340 goto freeit; 2341 } 2342 2343 if (ndopts.nd_opts_tgt_lladdr) { 2344 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2345 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2346 } 2347 2348 if (ndopts.nd_opts_rh) { 2349 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2350 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2351 } 2352 2353 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2354 nd6log((LOG_INFO, 2355 "icmp6_redirect_input: lladdrlen mismatch for %s " 2356 "(if %d, icmp6 packet %d): %s\n", 2357 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2358 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2359 goto bad; 2360 } 2361 2362 /* RFC 2461 8.3 */ 2363 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2364 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2365 2366 if (!is_onlink) { /* better router case. perform rtredirect. */ 2367 /* perform rtredirect */ 2368 struct sockaddr_in6 sdst; 2369 struct sockaddr_in6 sgw; 2370 struct sockaddr_in6 ssrc; 2371 2372 bzero(&sdst, sizeof(sdst)); 2373 bzero(&sgw, sizeof(sgw)); 2374 bzero(&ssrc, sizeof(ssrc)); 2375 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2376 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2377 sizeof(struct sockaddr_in6); 2378 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2379 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2380 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2381 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2382 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2383 (struct sockaddr *)&ssrc); 2384 } 2385 /* finally update cached route in each socket via pfctlinput */ 2386 { 2387 struct sockaddr_in6 sdst; 2388 2389 bzero(&sdst, sizeof(sdst)); 2390 sdst.sin6_family = AF_INET6; 2391 sdst.sin6_len = sizeof(struct sockaddr_in6); 2392 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2393 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2394#ifdef IPSEC 2395 key_sa_routechange((struct sockaddr *)&sdst); 2396#endif 2397 } 2398 2399 freeit: 2400 m_freem(m); 2401 return; 2402 2403 bad: 2404 icmp6stat.icp6s_badredirect++; 2405 m_freem(m); 2406} 2407 2408void 2409icmp6_redirect_output(m0, rt) 2410 struct mbuf *m0; 2411 struct rtentry *rt; 2412{ 2413 struct ifnet *ifp; /* my outgoing interface */ 2414 struct in6_addr *ifp_ll6; 2415 struct in6_addr *router_ll6; 2416 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2417 struct mbuf *m = NULL; /* newly allocated one */ 2418 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2419 struct nd_redirect *nd_rd; 2420 size_t maxlen; 2421 u_char *p; 2422 struct ifnet *outif = NULL; 2423 struct sockaddr_in6 src_sa; 2424 2425 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2426 2427 /* if we are not router, we don't send icmp6 redirect */ 2428 if (!ip6_forwarding || ip6_accept_rtadv) 2429 goto fail; 2430 2431 /* sanity check */ 2432 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2433 goto fail; 2434 2435 /* 2436 * Address check: 2437 * the source address must identify a neighbor, and 2438 * the destination address must not be a multicast address 2439 * [RFC 2461, sec 8.2] 2440 */ 2441 sip6 = mtod(m0, struct ip6_hdr *); 2442 bzero(&src_sa, sizeof(src_sa)); 2443 src_sa.sin6_family = AF_INET6; 2444 src_sa.sin6_len = sizeof(src_sa); 2445 src_sa.sin6_addr = sip6->ip6_src; 2446 /* we don't currently use sin6_scope_id, but eventually use it */ 2447 if (in6_addr2zoneid(ifp, &sip6->ip6_src, &src_sa.sin6_scope_id)) 2448 goto fail; 2449 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2450 goto fail; 2451 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2452 goto fail; /* what should we do here? */ 2453 2454 /* rate limit */ 2455 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2456 goto fail; 2457 2458 /* 2459 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2460 * we almost always ask for an mbuf cluster for simplicity. 2461 * (MHLEN < IPV6_MMTU is almost always true) 2462 */ 2463#if IPV6_MMTU >= MCLBYTES 2464# error assumption failed about IPV6_MMTU and MCLBYTES 2465#endif 2466 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2467 if (m && IPV6_MMTU >= MHLEN) 2468 MCLGET(m, M_DONTWAIT); 2469 if (!m) 2470 goto fail; 2471 m->m_pkthdr.rcvif = NULL; 2472 m->m_len = 0; 2473 maxlen = M_TRAILINGSPACE(m); 2474 maxlen = min(IPV6_MMTU, maxlen); 2475 /* just for safety */ 2476 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2477 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2478 goto fail; 2479 } 2480 2481 { 2482 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2483 struct in6_ifaddr *ia; 2484 if ((ia = in6ifa_ifpforlinklocal(ifp, 2485 IN6_IFF_NOTREADY| 2486 IN6_IFF_ANYCAST)) == NULL) 2487 goto fail; 2488 ifp_ll6 = &ia->ia_addr.sin6_addr; 2489 } 2490 2491 /* get ip6 linklocal address for the router. */ 2492 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2493 struct sockaddr_in6 *sin6; 2494 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2495 router_ll6 = &sin6->sin6_addr; 2496 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2497 router_ll6 = (struct in6_addr *)NULL; 2498 } else 2499 router_ll6 = (struct in6_addr *)NULL; 2500 2501 /* ip6 */ 2502 ip6 = mtod(m, struct ip6_hdr *); 2503 ip6->ip6_flow = 0; 2504 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2505 ip6->ip6_vfc |= IPV6_VERSION; 2506 /* ip6->ip6_plen will be set later */ 2507 ip6->ip6_nxt = IPPROTO_ICMPV6; 2508 ip6->ip6_hlim = 255; 2509 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2510 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2511 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2512 2513 /* ND Redirect */ 2514 nd_rd = (struct nd_redirect *)(ip6 + 1); 2515 nd_rd->nd_rd_type = ND_REDIRECT; 2516 nd_rd->nd_rd_code = 0; 2517 nd_rd->nd_rd_reserved = 0; 2518 if (rt->rt_flags & RTF_GATEWAY) { 2519 /* 2520 * nd_rd->nd_rd_target must be a link-local address in 2521 * better router cases. 2522 */ 2523 if (!router_ll6) 2524 goto fail; 2525 bcopy(router_ll6, &nd_rd->nd_rd_target, 2526 sizeof(nd_rd->nd_rd_target)); 2527 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2528 sizeof(nd_rd->nd_rd_dst)); 2529 } else { 2530 /* make sure redtgt == reddst */ 2531 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2532 sizeof(nd_rd->nd_rd_target)); 2533 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2534 sizeof(nd_rd->nd_rd_dst)); 2535 } 2536 2537 p = (u_char *)(nd_rd + 1); 2538 2539 if (!router_ll6) 2540 goto nolladdropt; 2541 2542 { 2543 /* target lladdr option */ 2544 struct rtentry *rt_router = NULL; 2545 int len; 2546 struct sockaddr_dl *sdl; 2547 struct nd_opt_hdr *nd_opt; 2548 char *lladdr; 2549 2550 rt_router = nd6_lookup(router_ll6, 0, ifp); 2551 if (!rt_router) 2552 goto nolladdropt; 2553 len = sizeof(*nd_opt) + ifp->if_addrlen; 2554 len = (len + 7) & ~7; /* round by 8 */ 2555 /* safety check */ 2556 if (len + (p - (u_char *)ip6) > maxlen) 2557 goto nolladdropt; 2558 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2559 (rt_router->rt_flags & RTF_LLINFO) && 2560 (rt_router->rt_gateway->sa_family == AF_LINK) && 2561 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2562 sdl->sdl_alen) { 2563 nd_opt = (struct nd_opt_hdr *)p; 2564 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2565 nd_opt->nd_opt_len = len >> 3; 2566 lladdr = (char *)(nd_opt + 1); 2567 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2568 p += len; 2569 } 2570 } 2571nolladdropt:; 2572 2573 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2574 2575 /* just to be safe */ 2576#ifdef M_DECRYPTED /*not openbsd*/ 2577 if (m0->m_flags & M_DECRYPTED) 2578 goto noredhdropt; 2579#endif 2580 if (p - (u_char *)ip6 > maxlen) 2581 goto noredhdropt; 2582 2583 { 2584 /* redirected header option */ 2585 int len; 2586 struct nd_opt_rd_hdr *nd_opt_rh; 2587 2588 /* 2589 * compute the maximum size for icmp6 redirect header option. 2590 * XXX room for auth header? 2591 */ 2592 len = maxlen - (p - (u_char *)ip6); 2593 len &= ~7; 2594 2595 /* This is just for simplicity. */ 2596 if (m0->m_pkthdr.len != m0->m_len) { 2597 if (m0->m_next) { 2598 m_freem(m0->m_next); 2599 m0->m_next = NULL; 2600 } 2601 m0->m_pkthdr.len = m0->m_len; 2602 } 2603 2604 /* 2605 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2606 * about padding/truncate rule for the original IP packet. 2607 * From the discussion on IPv6imp in Feb 1999, 2608 * the consensus was: 2609 * - "attach as much as possible" is the goal 2610 * - pad if not aligned (original size can be guessed by 2611 * original ip6 header) 2612 * Following code adds the padding if it is simple enough, 2613 * and truncates if not. 2614 */ 2615 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2616 panic("assumption failed in %s:%d", __FILE__, 2617 __LINE__); 2618 2619 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2620 /* not enough room, truncate */ 2621 m0->m_pkthdr.len = m0->m_len = len - 2622 sizeof(*nd_opt_rh); 2623 } else { 2624 /* enough room, pad or truncate */ 2625 size_t extra; 2626 2627 extra = m0->m_pkthdr.len % 8; 2628 if (extra) { 2629 /* pad if easy enough, truncate if not */ 2630 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2631 /* pad */ 2632 m0->m_len += (8 - extra); 2633 m0->m_pkthdr.len += (8 - extra); 2634 } else { 2635 /* truncate */ 2636 m0->m_pkthdr.len -= extra; 2637 m0->m_len -= extra; 2638 } 2639 } 2640 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2641 m0->m_pkthdr.len = m0->m_len = len - 2642 sizeof(*nd_opt_rh); 2643 } 2644 2645 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2646 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2647 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2648 nd_opt_rh->nd_opt_rh_len = len >> 3; 2649 p += sizeof(*nd_opt_rh); 2650 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2651 2652 /* connect m0 to m */ 2653 m_tag_delete_chain(m0, NULL); 2654 m0->m_flags &= ~M_PKTHDR; 2655 m->m_next = m0; 2656 m->m_pkthdr.len = m->m_len + m0->m_len; 2657 m0 = NULL; 2658 } 2659noredhdropt:; 2660 if (m0) { 2661 m_freem(m0); 2662 m0 = NULL; 2663 } 2664 2665 /* XXX: clear embedded link IDs in the inner header */ 2666 in6_clearscope(&sip6->ip6_src); 2667 in6_clearscope(&sip6->ip6_dst); 2668 in6_clearscope(&nd_rd->nd_rd_target); 2669 in6_clearscope(&nd_rd->nd_rd_dst); 2670 2671 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2672 2673 nd_rd->nd_rd_cksum = 0; 2674 nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2675 sizeof(*ip6), ntohs(ip6->ip6_plen)); 2676 2677 /* send the packet to outside... */ 2678 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2679 if (outif) { 2680 icmp6_ifstat_inc(outif, ifs6_out_msg); 2681 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2682 } 2683 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2684 2685 return; 2686 2687fail: 2688 if (m) 2689 m_freem(m); 2690 if (m0) 2691 m_freem(m0); 2692} 2693 2694/* 2695 * ICMPv6 socket option processing. 2696 */ 2697int 2698icmp6_ctloutput(so, sopt) 2699 struct socket *so; 2700 struct sockopt *sopt; 2701{ 2702 int error = 0; 2703 int optlen; 2704 struct inpcb *inp = sotoinpcb(so); 2705 int level, op, optname; 2706 2707 if (sopt) { 2708 level = sopt->sopt_level; 2709 op = sopt->sopt_dir; 2710 optname = sopt->sopt_name; 2711 optlen = sopt->sopt_valsize; 2712 } else 2713 level = op = optname = optlen = 0; 2714 2715 if (level != IPPROTO_ICMPV6) { 2716 return EINVAL; 2717 } 2718 2719 switch (op) { 2720 case PRCO_SETOPT: 2721 switch (optname) { 2722 case ICMP6_FILTER: 2723 { 2724 struct icmp6_filter *p; 2725 2726 if (optlen != sizeof(*p)) { 2727 error = EMSGSIZE; 2728 break; 2729 } 2730 if (inp->in6p_icmp6filt == NULL) { 2731 error = EINVAL; 2732 break; 2733 } 2734 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen, 2735 optlen); 2736 break; 2737 } 2738 2739 default: 2740 error = ENOPROTOOPT; 2741 break; 2742 } 2743 break; 2744 2745 case PRCO_GETOPT: 2746 switch (optname) { 2747 case ICMP6_FILTER: 2748 { 2749 if (inp->in6p_icmp6filt == NULL) { 2750 error = EINVAL; 2751 break; 2752 } 2753 error = sooptcopyout(sopt, inp->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 */ 2776static int 2777icmp6_ratelimit(dst, type, code) 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