1 /* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.13 2003/05/06 06:46:58 suz Exp $ */ 2 /* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun 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 "opt_inet.h" 65 #include "opt_inet6.h" 66 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/malloc.h> 70 #include <sys/mbuf.h> 71 #include <sys/protosw.h> 72 #include <sys/socket.h> 73 #include <sys/socketvar.h> 74 #include <sys/socketops.h> 75 #include <sys/time.h> 76 #include <sys/kernel.h> 77 #include <sys/syslog.h> 78 #include <sys/domain.h> 79 80 #include <sys/thread2.h> 81 #include <sys/msgport2.h> 82 83 #include <net/if.h> 84 #include <net/route.h> 85 #include <net/if_dl.h> 86 #include <net/if_types.h> 87 #include <net/netisr2.h> 88 #include <net/netmsg2.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <netinet/ip6.h> 93 #include <netinet6/ip6_var.h> 94 #include <netinet/icmp6.h> 95 #include <netinet6/mld6_var.h> 96 #include <netinet/in_pcb.h> 97 #include <netinet6/in6_pcb.h> 98 #include <netinet6/nd6.h> 99 #include <netinet6/in6_ifattach.h> 100 #include <netinet6/ip6protosw.h> 101 102 #include <net/net_osdep.h> 103 104 #ifdef HAVE_NRL_INPCB 105 /* inpcb members */ 106 #define in6pcb inpcb 107 #define in6p_laddr inp_laddr6 108 #define in6p_faddr inp_faddr6 109 #define in6p_icmp6filt inp_icmp6filt 110 #define in6p_route inp_route 111 #define in6p_socket inp_socket 112 #define in6p_flags inp_flags 113 #define in6p_moptions inp_moptions6 114 #define in6p_outputopts inp_outputopts6 115 #define in6p_ip6 inp_ipv6 116 #define in6p_flowinfo inp_flowinfo 117 #define in6p_next inp_next 118 #define in6p_prev inp_prev 119 /* function names */ 120 #define in6_pcbdetach in_pcbdetach 121 #define in6_rtchange in_rtchange 122 123 /* 124 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from 125 * others... 126 */ 127 #define in6p_ip6_nxt inp_ipv6.ip6_nxt 128 #endif 129 130 #define ICMP6_FASTTIMO (hz / PR_FASTHZ) 131 132 /* 133 * ppratecheck() is available, so define it here. 134 */ 135 #define HAVE_PPSRATECHECK 136 137 extern struct domain inet6domain; 138 extern struct protosw inet6sw[]; 139 extern u_char ip6_protox[]; 140 141 struct icmp6stat icmp6stat; 142 143 extern struct inpcbinfo ripcbinfo; 144 extern int icmp6errppslim; 145 static int icmp6errpps_count = 0; 146 static struct timeval icmp6errppslim_last; 147 extern int icmp6_nodeinfo; 148 149 static void icmp6_errcount (struct icmp6errstat *, int, int); 150 static int icmp6_rip6_input (struct mbuf **, int); 151 static int icmp6_ratelimit (const struct in6_addr *, const int, const int); 152 static const char *icmp6_redirect_diag (struct in6_addr *, 153 struct in6_addr *, struct in6_addr *); 154 #ifndef HAVE_PPSRATECHECK 155 static int ppsratecheck (struct timeval *, int *, int); 156 #endif 157 static struct mbuf *ni6_input (struct mbuf *, int); 158 static struct mbuf *ni6_nametodns (const char *, int, int); 159 static int ni6_dnsmatch (const char *, int, const char *, int); 160 static int ni6_addrs (struct icmp6_nodeinfo *, struct mbuf *, 161 struct ifnet **, char *); 162 static int ni6_store_addrs (struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 163 struct ifnet *, int); 164 static int icmp6_notify_error (struct mbuf *, int, int, int); 165 166 static void icmp6_fasttimo(void *); 167 static void icmp6_fasttimo_dispatch(netmsg_t); 168 169 #ifdef COMPAT_RFC1885 170 static struct route_in6 icmp6_reflect_rt; 171 #endif 172 173 static struct callout icmp6_fasttimo_ch; 174 static struct netmsg_base icmp6_fasttimo_nmsg; 175 176 void 177 icmp6_init(void) 178 { 179 180 mld6_init(); 181 182 callout_init_mp(&icmp6_fasttimo_ch); 183 netmsg_init(&icmp6_fasttimo_nmsg, NULL, &netisr_adone_rport, 184 MSGF_PRIORITY, icmp6_fasttimo_dispatch); 185 186 callout_reset_bycpu(&icmp6_fasttimo_ch, ICMP6_FASTTIMO, 187 icmp6_fasttimo, NULL, 0); 188 } 189 190 static void 191 icmp6_errcount(struct icmp6errstat *stat, int type, int code) 192 { 193 switch (type) { 194 case ICMP6_DST_UNREACH: 195 switch (code) { 196 case ICMP6_DST_UNREACH_NOROUTE: 197 stat->icp6errs_dst_unreach_noroute++; 198 return; 199 case ICMP6_DST_UNREACH_ADMIN: 200 stat->icp6errs_dst_unreach_admin++; 201 return; 202 case ICMP6_DST_UNREACH_BEYONDSCOPE: 203 stat->icp6errs_dst_unreach_beyondscope++; 204 return; 205 case ICMP6_DST_UNREACH_ADDR: 206 stat->icp6errs_dst_unreach_addr++; 207 return; 208 case ICMP6_DST_UNREACH_NOPORT: 209 stat->icp6errs_dst_unreach_noport++; 210 return; 211 } 212 break; 213 case ICMP6_PACKET_TOO_BIG: 214 stat->icp6errs_packet_too_big++; 215 return; 216 case ICMP6_TIME_EXCEEDED: 217 switch (code) { 218 case ICMP6_TIME_EXCEED_TRANSIT: 219 stat->icp6errs_time_exceed_transit++; 220 return; 221 case ICMP6_TIME_EXCEED_REASSEMBLY: 222 stat->icp6errs_time_exceed_reassembly++; 223 return; 224 } 225 break; 226 case ICMP6_PARAM_PROB: 227 switch (code) { 228 case ICMP6_PARAMPROB_HEADER: 229 stat->icp6errs_paramprob_header++; 230 return; 231 case ICMP6_PARAMPROB_NEXTHEADER: 232 stat->icp6errs_paramprob_nextheader++; 233 return; 234 case ICMP6_PARAMPROB_OPTION: 235 stat->icp6errs_paramprob_option++; 236 return; 237 } 238 break; 239 case ND_REDIRECT: 240 stat->icp6errs_redirect++; 241 return; 242 } 243 stat->icp6errs_unknown++; 244 } 245 246 /* 247 * Generate an error packet of type error in response to bad IP6 packet. 248 */ 249 void 250 icmp6_error(struct mbuf *m, int type, int code, int param) 251 { 252 struct ip6_hdr *oip6, *nip6; 253 struct icmp6_hdr *icmp6; 254 u_int preplen; 255 int off; 256 int nxt; 257 258 icmp6stat.icp6s_error++; 259 260 /* count per-type-code statistics */ 261 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 262 263 #ifdef M_DECRYPTED /*not openbsd*/ 264 if (m->m_flags & M_DECRYPTED) { 265 icmp6stat.icp6s_canterror++; 266 goto freeit; 267 } 268 #endif 269 270 #ifndef PULLDOWN_TEST 271 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 272 #else 273 if (m->m_len < sizeof(struct ip6_hdr)) { 274 m = m_pullup(m, sizeof(struct ip6_hdr)); 275 if (m == NULL) 276 return; 277 } 278 #endif 279 oip6 = mtod(m, struct ip6_hdr *); 280 if ((oip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 281 kprintf("%s to %s not IPv6 (%d != %d)\n", 282 __func__, ip6_sprintf(&oip6->ip6_src), 283 oip6->ip6_vfc & IPV6_VERSION_MASK, IPV6_VERSION); 284 goto freeit; 285 } 286 287 /* 288 * Multicast destination check. For unrecognized option errors, 289 * this check has already done in ip6_unknown_opt(), so we can 290 * check only for other errors. 291 */ 292 if ((m->m_flags & (M_BCAST|M_MCAST) || 293 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 294 (type != ICMP6_PACKET_TOO_BIG && 295 (type != ICMP6_PARAM_PROB || 296 code != ICMP6_PARAMPROB_OPTION))) 297 goto freeit; 298 299 /* Source address check. XXX: the case of anycast source? */ 300 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 301 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 302 goto freeit; 303 304 /* 305 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 306 * don't do it. 307 */ 308 nxt = -1; 309 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 310 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 311 struct icmp6_hdr *icp; 312 313 #ifndef PULLDOWN_TEST 314 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 315 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 316 #else 317 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 318 sizeof(*icp)); 319 if (icp == NULL) { 320 icmp6stat.icp6s_tooshort++; 321 return; 322 } 323 #endif 324 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 325 icp->icmp6_type == ND_REDIRECT) { 326 /* 327 * ICMPv6 error 328 * Special case: for redirect (which is 329 * informational) we must not send icmp6 error. 330 */ 331 icmp6stat.icp6s_canterror++; 332 goto freeit; 333 } else { 334 /* ICMPv6 informational - send the error */ 335 } 336 } else { 337 /* non-ICMPv6 - send the error */ 338 } 339 340 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 341 342 /* Finally, do rate limitation check. */ 343 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 344 icmp6stat.icp6s_toofreq++; 345 goto freeit; 346 } 347 348 /* 349 * OK, ICMP6 can be generated. 350 */ 351 352 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 353 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 354 355 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 356 M_PREPEND(m, preplen, M_NOWAIT); 357 if (m && m->m_len < preplen) 358 m = m_pullup(m, preplen); 359 if (m == NULL) { 360 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 361 return; 362 } 363 364 nip6 = mtod(m, struct ip6_hdr *); 365 nip6->ip6_src = oip6->ip6_src; 366 nip6->ip6_dst = oip6->ip6_dst; 367 368 in6_clearscope(&oip6->ip6_src); 369 in6_clearscope(&oip6->ip6_dst); 370 371 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 372 icmp6->icmp6_type = type; 373 icmp6->icmp6_code = code; 374 icmp6->icmp6_pptr = htonl((u_int32_t)param); 375 376 /* 377 * icmp6_reflect() is designed to be in the input path. 378 * icmp6_error() can be called from both input and outut path, 379 * and if we are in output path rcvif could contain bogus value. 380 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 381 * information in ip header (nip6). 382 */ 383 m->m_pkthdr.rcvif = NULL; 384 385 icmp6stat.icp6s_outhist[type]++; 386 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 387 388 return; 389 390 freeit: 391 /* 392 * If we can't tell wheter or not we can generate ICMP6, free it. 393 */ 394 m_freem(m); 395 } 396 397 /* 398 * Process a received ICMP6 message. 399 */ 400 int 401 icmp6_input(struct mbuf **mp, int *offp, int proto) 402 { 403 struct mbuf *m = *mp, *n; 404 struct ip6_hdr *ip6, *nip6; 405 struct icmp6_hdr *icmp6, *nicmp6; 406 int off = *offp; 407 int icmp6len = m->m_pkthdr.len - *offp; 408 int code, sum, noff; 409 410 #ifndef PULLDOWN_TEST 411 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 412 /* m might change if M_LOOP. So, call mtod after this */ 413 #endif 414 415 /* 416 * Locate icmp6 structure in mbuf, and check 417 * that not corrupted and of at least minimum length 418 */ 419 420 ip6 = mtod(m, struct ip6_hdr *); 421 if (icmp6len < sizeof(struct icmp6_hdr)) { 422 icmp6stat.icp6s_tooshort++; 423 goto freeit; 424 } 425 426 /* 427 * calculate the checksum 428 */ 429 #ifndef PULLDOWN_TEST 430 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 431 #else 432 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 433 if (icmp6 == NULL) { 434 icmp6stat.icp6s_tooshort++; 435 return IPPROTO_DONE; 436 } 437 #endif 438 code = icmp6->icmp6_code; 439 440 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 441 nd6log((LOG_ERR, 442 "ICMP6 checksum error(%d|%x) %s\n", 443 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); 444 icmp6stat.icp6s_checksum++; 445 goto freeit; 446 } 447 448 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 449 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 450 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 451 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 452 453 switch (icmp6->icmp6_type) { 454 case ICMP6_DST_UNREACH: 455 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 456 switch (code) { 457 case ICMP6_DST_UNREACH_NOROUTE: 458 code = PRC_UNREACH_NET; 459 break; 460 case ICMP6_DST_UNREACH_ADMIN: 461 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 462 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 463 break; 464 case ICMP6_DST_UNREACH_ADDR: 465 code = PRC_HOSTDEAD; 466 break; 467 #ifdef COMPAT_RFC1885 468 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 469 code = PRC_UNREACH_SRCFAIL; 470 break; 471 #else 472 case ICMP6_DST_UNREACH_BEYONDSCOPE: 473 /* I mean "source address was incorrect." */ 474 code = PRC_PARAMPROB; 475 break; 476 #endif 477 case ICMP6_DST_UNREACH_NOPORT: 478 code = PRC_UNREACH_PORT; 479 break; 480 default: 481 goto badcode; 482 } 483 goto deliver; 484 break; 485 486 case ICMP6_PACKET_TOO_BIG: 487 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 488 if (code != 0) 489 goto badcode; 490 491 code = PRC_MSGSIZE; 492 493 /* 494 * Updating the path MTU will be done after examining 495 * intermediate extension headers. 496 */ 497 goto deliver; 498 break; 499 500 case ICMP6_TIME_EXCEEDED: 501 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 502 switch (code) { 503 case ICMP6_TIME_EXCEED_TRANSIT: 504 case ICMP6_TIME_EXCEED_REASSEMBLY: 505 code += PRC_TIMXCEED_INTRANS; 506 break; 507 default: 508 goto badcode; 509 } 510 goto deliver; 511 break; 512 513 case ICMP6_PARAM_PROB: 514 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 515 switch (code) { 516 case ICMP6_PARAMPROB_NEXTHEADER: 517 code = PRC_UNREACH_PROTOCOL; 518 break; 519 case ICMP6_PARAMPROB_HEADER: 520 case ICMP6_PARAMPROB_OPTION: 521 code = PRC_PARAMPROB; 522 break; 523 default: 524 goto badcode; 525 } 526 goto deliver; 527 break; 528 529 case ICMP6_ECHO_REQUEST: 530 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 531 if (code != 0) 532 goto badcode; 533 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 534 /* Give up remote */ 535 break; 536 } 537 if ((n->m_flags & M_EXT) || 538 n->m_len < off + sizeof(struct icmp6_hdr)) { 539 struct mbuf *n0 = n; 540 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 541 int n0len; 542 543 /* 544 * Prepare an internal mbuf. m_pullup() doesn't 545 * always copy the length we specified. 546 */ 547 if (maxlen >= MCLBYTES) { 548 /* Give up remote */ 549 m_freem(n0); 550 break; 551 } 552 n = m_getb(maxlen, M_NOWAIT, n0->m_type, M_PKTHDR); 553 if (n == NULL) { 554 /* Give up remote */ 555 m_freem(n0); 556 break; 557 } 558 n0len = n0->m_pkthdr.len; /* save for use below */ 559 M_MOVE_PKTHDR(n, n0); 560 /* 561 * Copy IPv6 and ICMPv6 only. 562 */ 563 nip6 = mtod(n, struct ip6_hdr *); 564 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 565 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 566 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 567 noff = sizeof(struct ip6_hdr); 568 /* new mbuf contains only ipv6+icmpv6 headers */ 569 n->m_len = noff + sizeof(struct icmp6_hdr); 570 /* 571 * Adjust mbuf. ip6_plen will be adjusted in 572 * ip6_output(). 573 */ 574 m_adj(n0, off + sizeof(struct icmp6_hdr)); 575 /* recalculate complete packet size */ 576 n->m_pkthdr.len = n0len + (noff - off); 577 n->m_next = n0; 578 } else { 579 nip6 = mtod(n, struct ip6_hdr *); 580 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 581 noff = off; 582 } 583 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 584 nicmp6->icmp6_code = 0; 585 if (n) { 586 icmp6stat.icp6s_reflect++; 587 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 588 icmp6_reflect(n, noff); 589 } 590 break; 591 592 case ICMP6_ECHO_REPLY: 593 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 594 if (code != 0) 595 goto badcode; 596 break; 597 598 case MLD_LISTENER_QUERY: 599 case MLD_LISTENER_REPORT: 600 if (icmp6len < sizeof(struct mld_hdr)) 601 goto badlen; 602 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 603 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 604 else 605 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 606 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 607 /* give up local */ 608 mld6_input(m, off); 609 m = NULL; 610 goto freeit; 611 } 612 mld6_input(n, off); 613 /* m stays. */ 614 break; 615 616 case MLD_LISTENER_DONE: 617 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 618 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 619 goto badlen; 620 break; /* nothing to be done in kernel */ 621 622 case MLD_MTRACE_RESP: 623 case MLD_MTRACE: 624 /* XXX: these two are experimental. not officially defind. */ 625 /* XXX: per-interface statistics? */ 626 break; /* just pass it to applications */ 627 628 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 629 { 630 enum { WRU, FQDN } mode; 631 632 if (!icmp6_nodeinfo) 633 break; 634 635 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 636 mode = WRU; 637 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 638 mode = FQDN; 639 else 640 goto badlen; 641 642 #define hostnamelen strlen(hostname) 643 if (mode == FQDN) { 644 #ifndef PULLDOWN_TEST 645 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 646 IPPROTO_DONE); 647 #endif 648 n = m_copym(m, 0, M_COPYALL, M_NOWAIT); 649 if (n != NULL) 650 n = ni6_input(n, off); 651 /* XXX meaningless if n == NULL */ 652 noff = sizeof(struct ip6_hdr); 653 } else { 654 u_char *p; 655 int maxlen, maxhlen; 656 657 if ((icmp6_nodeinfo & 5) != 5) 658 break; 659 660 if (code != 0) 661 goto badcode; 662 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 663 if (maxlen >= MCLBYTES) { 664 /* Give up remote */ 665 break; 666 } 667 n = m_getb(maxlen, M_NOWAIT, m->m_type, M_PKTHDR); 668 if (n == NULL) { 669 /* Give up remote */ 670 break; 671 } 672 if (!m_dup_pkthdr(n, m, M_NOWAIT)) { 673 /* 674 * Previous code did a blind M_COPY_PKTHDR 675 * and said "just for rcvif". If true, then 676 * we could tolerate the dup failing (due to 677 * the deep copy of the tag chain). For now 678 * be conservative and just fail. 679 */ 680 m_free(n); 681 break; 682 } 683 n->m_len = 0; 684 maxhlen = M_TRAILINGSPACE(n) - maxlen; 685 if (maxhlen > hostnamelen) 686 maxhlen = hostnamelen; 687 /* 688 * Copy IPv6 and ICMPv6 only. 689 */ 690 nip6 = mtod(n, struct ip6_hdr *); 691 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 692 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 693 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 694 p = (u_char *)(nicmp6 + 1); 695 bzero(p, 4); 696 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 697 noff = sizeof(struct ip6_hdr); 698 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 699 sizeof(struct icmp6_hdr) + 4 + maxhlen; 700 nicmp6->icmp6_type = ICMP6_WRUREPLY; 701 nicmp6->icmp6_code = 0; 702 } 703 #undef hostnamelen 704 if (n) { 705 icmp6stat.icp6s_reflect++; 706 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 707 icmp6_reflect(n, noff); 708 } 709 break; 710 } 711 712 case ICMP6_WRUREPLY: 713 if (code != 0) 714 goto badcode; 715 break; 716 717 case ND_ROUTER_SOLICIT: 718 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 719 if (code != 0) 720 goto badcode; 721 if (icmp6len < sizeof(struct nd_router_solicit)) 722 goto badlen; 723 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 724 /* give up local */ 725 nd6_rs_input(m, off, icmp6len); 726 m = NULL; 727 goto freeit; 728 } 729 nd6_rs_input(n, off, icmp6len); 730 /* m stays. */ 731 break; 732 733 case ND_ROUTER_ADVERT: 734 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 735 if (code != 0) 736 goto badcode; 737 if (icmp6len < sizeof(struct nd_router_advert)) 738 goto badlen; 739 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 740 /* give up local */ 741 nd6_ra_input(m, off, icmp6len); 742 m = NULL; 743 goto freeit; 744 } 745 nd6_ra_input(n, off, icmp6len); 746 /* m stays. */ 747 break; 748 749 case ND_NEIGHBOR_SOLICIT: 750 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 751 if (code != 0) 752 goto badcode; 753 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 754 goto badlen; 755 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 756 /* give up local */ 757 nd6_ns_input(m, off, icmp6len); 758 m = NULL; 759 goto freeit; 760 } 761 nd6_ns_input(n, off, icmp6len); 762 /* m stays. */ 763 break; 764 765 case ND_NEIGHBOR_ADVERT: 766 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 767 if (code != 0) 768 goto badcode; 769 if (icmp6len < sizeof(struct nd_neighbor_advert)) 770 goto badlen; 771 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 772 /* give up local */ 773 nd6_na_input(m, off, icmp6len); 774 m = NULL; 775 goto freeit; 776 } 777 nd6_na_input(n, off, icmp6len); 778 /* m stays. */ 779 break; 780 781 case ND_REDIRECT: 782 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 783 if (code != 0) 784 goto badcode; 785 if (icmp6len < sizeof(struct nd_redirect)) 786 goto badlen; 787 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 788 /* give up local */ 789 icmp6_redirect_input(m, off); 790 m = NULL; 791 goto freeit; 792 } 793 icmp6_redirect_input(n, off); 794 /* m stays. */ 795 break; 796 797 case ICMP6_ROUTER_RENUMBERING: 798 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 799 code != ICMP6_ROUTER_RENUMBERING_RESULT) 800 goto badcode; 801 if (icmp6len < sizeof(struct icmp6_router_renum)) 802 goto badlen; 803 break; 804 805 default: 806 nd6log((LOG_DEBUG, 807 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 808 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 809 ip6_sprintf(&ip6->ip6_dst), 810 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 811 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 812 /* ICMPv6 error: MUST deliver it by spec... */ 813 code = PRC_NCMDS; 814 /* deliver */ 815 } else { 816 /* ICMPv6 informational: MUST not deliver */ 817 break; 818 } 819 deliver: 820 if (icmp6_notify_error(m, off, icmp6len, code)) { 821 /* In this case, m should've been freed. */ 822 return (IPPROTO_DONE); 823 } 824 break; 825 826 badcode: 827 icmp6stat.icp6s_badcode++; 828 break; 829 830 badlen: 831 icmp6stat.icp6s_badlen++; 832 break; 833 } 834 835 /* deliver the packet to appropriate sockets */ 836 icmp6_rip6_input(&m, *offp); 837 838 return IPPROTO_DONE; 839 840 freeit: 841 m_freem(m); 842 return IPPROTO_DONE; 843 } 844 845 static int 846 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 847 { 848 struct icmp6_hdr *icmp6; 849 struct ip6_hdr *eip6; 850 u_int32_t notifymtu; 851 struct sockaddr_in6 icmp6src, icmp6dst; 852 853 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 854 icmp6stat.icp6s_tooshort++; 855 goto freeit; 856 } 857 #ifndef PULLDOWN_TEST 858 IP6_EXTHDR_CHECK(m, off, 859 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 860 -1); 861 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 862 #else 863 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 864 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 865 if (icmp6 == NULL) { 866 icmp6stat.icp6s_tooshort++; 867 return (-1); 868 } 869 #endif 870 eip6 = (struct ip6_hdr *)(icmp6 + 1); 871 872 /* Detect the upper level protocol */ 873 { 874 u_int8_t nxt = eip6->ip6_nxt; 875 int eoff = off + sizeof(struct icmp6_hdr) + 876 sizeof(struct ip6_hdr); 877 struct ip6ctlparam ip6cp; 878 struct in6_addr *finaldst = NULL; 879 int icmp6type = icmp6->icmp6_type; 880 struct ip6_frag *fh; 881 struct ip6_rthdr *rth; 882 int rthlen; 883 884 while (1) { /* XXX: should avoid infinite loop explicitly? */ 885 struct ip6_ext *eh; 886 887 switch (nxt) { 888 case IPPROTO_HOPOPTS: 889 case IPPROTO_DSTOPTS: 890 case IPPROTO_AH: 891 #ifndef PULLDOWN_TEST 892 IP6_EXTHDR_CHECK(m, 0, 893 eoff + sizeof(struct ip6_ext), -1); 894 eh = (struct ip6_ext *) 895 (mtod(m, caddr_t) + eoff); 896 #else 897 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 898 eoff, sizeof(*eh)); 899 if (eh == NULL) { 900 icmp6stat.icp6s_tooshort++; 901 return (-1); 902 } 903 #endif 904 905 if (nxt == IPPROTO_AH) 906 eoff += (eh->ip6e_len + 2) << 2; 907 else 908 eoff += (eh->ip6e_len + 1) << 3; 909 nxt = eh->ip6e_nxt; 910 break; 911 case IPPROTO_ROUTING: 912 /* 913 * When the erroneous packet contains a 914 * routing header, we should examine the 915 * header to determine the final destination. 916 * Otherwise, we can't properly update 917 * information that depends on the final 918 * destination (e.g. path MTU). 919 */ 920 #ifndef PULLDOWN_TEST 921 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 922 -1); 923 rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 924 + eoff); 925 #else 926 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 927 eoff, sizeof(*rth)); 928 if (rth == NULL) { 929 icmp6stat.icp6s_tooshort++; 930 return (-1); 931 } 932 #endif 933 rthlen = (rth->ip6r_len + 1) << 3; 934 eoff += rthlen; 935 nxt = rth->ip6r_nxt; 936 break; 937 case IPPROTO_FRAGMENT: 938 #ifndef PULLDOWN_TEST 939 IP6_EXTHDR_CHECK(m, 0, eoff + 940 sizeof(struct ip6_frag), 941 -1); 942 fh = (struct ip6_frag *)(mtod(m, caddr_t) 943 + eoff); 944 #else 945 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 946 eoff, sizeof(*fh)); 947 if (fh == NULL) { 948 icmp6stat.icp6s_tooshort++; 949 return (-1); 950 } 951 #endif 952 /* 953 * Data after a fragment header is meaningless 954 * unless it is the first fragment, but 955 * we'll go to the notify label for path MTU 956 * discovery. 957 */ 958 if (fh->ip6f_offlg & IP6F_OFF_MASK) 959 goto notify; 960 961 eoff += sizeof(struct ip6_frag); 962 nxt = fh->ip6f_nxt; 963 break; 964 default: 965 /* 966 * This case includes ESP and the No Next 967 * Header. In such cases going to the notify 968 * label does not have any meaning 969 * (i.e. pr_ctlinput will be NULL), but we go 970 * anyway since we might have to update 971 * path MTU information. 972 */ 973 goto notify; 974 } 975 } 976 notify: 977 #ifndef PULLDOWN_TEST 978 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 979 #else 980 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 981 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 982 if (icmp6 == NULL) { 983 icmp6stat.icp6s_tooshort++; 984 return (-1); 985 } 986 #endif 987 988 eip6 = (struct ip6_hdr *)(icmp6 + 1); 989 bzero(&icmp6dst, sizeof(icmp6dst)); 990 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 991 icmp6dst.sin6_family = AF_INET6; 992 if (finaldst == NULL) 993 icmp6dst.sin6_addr = eip6->ip6_dst; 994 else 995 icmp6dst.sin6_addr = *finaldst; 996 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6dst.sin6_addr, 997 &icmp6dst.sin6_scope_id)) 998 goto freeit; 999 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 1000 NULL, NULL)) { 1001 /* should be impossbile */ 1002 nd6log((LOG_DEBUG, 1003 "icmp6_notify_error: in6_embedscope failed\n")); 1004 goto freeit; 1005 } 1006 1007 /* 1008 * retrieve parameters from the inner IPv6 header, and convert 1009 * them into sockaddr structures. 1010 */ 1011 bzero(&icmp6src, sizeof(icmp6src)); 1012 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1013 icmp6src.sin6_family = AF_INET6; 1014 icmp6src.sin6_addr = eip6->ip6_src; 1015 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6src.sin6_addr, 1016 &icmp6src.sin6_scope_id)) 1017 goto freeit; 1018 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 1019 NULL, NULL)) { 1020 /* should be impossbile */ 1021 nd6log((LOG_DEBUG, 1022 "icmp6_notify_error: in6_embedscope failed\n")); 1023 goto freeit; 1024 } 1025 icmp6src.sin6_flowinfo = 1026 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1027 1028 if (finaldst == NULL) 1029 finaldst = &eip6->ip6_dst; 1030 ip6cp.ip6c_m = m; 1031 ip6cp.ip6c_icmp6 = icmp6; 1032 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1033 ip6cp.ip6c_off = eoff; 1034 ip6cp.ip6c_finaldst = finaldst; 1035 ip6cp.ip6c_src = &icmp6src; 1036 ip6cp.ip6c_nxt = nxt; 1037 1038 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1039 notifymtu = ntohl(icmp6->icmp6_mtu); 1040 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1041 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 1042 } 1043 1044 so_pr_ctlinput( 1045 &inet6sw[ip6_protox[nxt]], 1046 code, (struct sockaddr *)&icmp6dst, &ip6cp); 1047 } 1048 return (0); 1049 1050 freeit: 1051 m_freem(m); 1052 return (-1); 1053 } 1054 1055 void 1056 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1057 { 1058 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1059 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1060 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1061 u_int mtu = ntohl(icmp6->icmp6_mtu); 1062 struct rtentry *rt = NULL; 1063 struct sockaddr_in6 sin6; 1064 1065 if (!validated) 1066 return; 1067 1068 bzero(&sin6, sizeof(sin6)); 1069 sin6.sin6_family = PF_INET6; 1070 sin6.sin6_len = sizeof(struct sockaddr_in6); 1071 sin6.sin6_addr = *dst; 1072 /* XXX normally, this won't happen */ 1073 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1074 sin6.sin6_addr.s6_addr16[1] = 1075 htons(m->m_pkthdr.rcvif->if_index); 1076 } 1077 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1078 rt = rtpurelookup((struct sockaddr *)&sin6); 1079 if (rt != NULL && (rt->rt_flags & RTF_HOST) && 1080 !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 1081 if (mtu < IPV6_MMTU) { /* XXX */ 1082 rt->rt_rmx.rmx_locks |= RTV_MTU; 1083 } else if (mtu < rt->rt_ifp->if_mtu && 1084 rt->rt_rmx.rmx_mtu > mtu) { 1085 icmp6stat.icp6s_pmtuchg++; 1086 rt->rt_rmx.rmx_mtu = mtu; 1087 } 1088 } 1089 if (rt) 1090 --rt->rt_refcnt; 1091 } 1092 1093 /* 1094 * Process a Node Information Query packet, based on 1095 * draft-ietf-ipngwg-icmp-name-lookups-07. 1096 * 1097 * Spec incompatibilities: 1098 * - IPv6 Subject address handling 1099 * - IPv4 Subject address handling support missing 1100 * - Proxy reply (answer even if it's not for me) 1101 * - joins NI group address at in6_ifattach() time only, does not cope 1102 * with hostname changes by sethostname(3) 1103 */ 1104 #define hostnamelen strlen(hostname) 1105 static struct mbuf * 1106 ni6_input(struct mbuf *m, int off) 1107 { 1108 struct icmp6_nodeinfo *ni6, *nni6; 1109 struct mbuf *n = NULL; 1110 u_int16_t qtype; 1111 int subjlen; 1112 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1113 struct ni_reply_fqdn *fqdn; 1114 int addrs; /* for NI_QTYPE_NODEADDR */ 1115 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1116 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1117 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */ 1118 struct ip6_hdr *ip6; 1119 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1120 char *subj = NULL; 1121 struct in6_ifaddr *ia6 = NULL; 1122 1123 ip6 = mtod(m, struct ip6_hdr *); 1124 #ifndef PULLDOWN_TEST 1125 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1126 #else 1127 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1128 if (ni6 == NULL) { 1129 /* m is already reclaimed */ 1130 return NULL; 1131 } 1132 #endif 1133 1134 /* 1135 * Validate IPv6 destination address. 1136 * 1137 * The Responder must discard the Query without further processing 1138 * unless it is one of the Responder's unicast or anycast addresses, or 1139 * a link-local scope multicast address which the Responder has joined. 1140 * [icmp-name-lookups-07, Section 4.] 1141 */ 1142 bzero(&sin6, sizeof(sin6)); 1143 sin6.sin6_family = AF_INET6; 1144 sin6.sin6_len = sizeof(struct sockaddr_in6); 1145 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1146 /* XXX scopeid */ 1147 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) { 1148 /* unicast/anycast, fine */ 1149 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) && 1150 (icmp6_nodeinfo & 4) == 0) { 1151 nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 1152 "a temporary address in %s:%d", 1153 __FILE__, __LINE__)); 1154 goto bad; 1155 } 1156 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1157 ; /* link-local multicast, fine */ 1158 else 1159 goto bad; 1160 1161 /* validate query Subject field. */ 1162 qtype = ntohs(ni6->ni_qtype); 1163 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1164 switch (qtype) { 1165 case NI_QTYPE_NOOP: 1166 case NI_QTYPE_SUPTYPES: 1167 /* 07 draft */ 1168 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1169 break; 1170 /* FALLTHROUGH */ 1171 case NI_QTYPE_FQDN: 1172 case NI_QTYPE_NODEADDR: 1173 switch (ni6->ni_code) { 1174 case ICMP6_NI_SUBJ_IPV6: 1175 #if ICMP6_NI_SUBJ_IPV6 != 0 1176 case 0: 1177 #endif 1178 /* 1179 * backward compatibility - try to accept 03 draft 1180 * format, where no Subject is present. 1181 */ 1182 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1183 subjlen == 0) { 1184 oldfqdn++; 1185 break; 1186 } 1187 #if ICMP6_NI_SUBJ_IPV6 != 0 1188 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1189 goto bad; 1190 #endif 1191 1192 if (subjlen != sizeof(sin6.sin6_addr)) 1193 goto bad; 1194 1195 /* 1196 * Validate Subject address. 1197 * 1198 * Not sure what exactly "address belongs to the node" 1199 * means in the spec, is it just unicast, or what? 1200 * 1201 * At this moment we consider Subject address as 1202 * "belong to the node" if the Subject address equals 1203 * to the IPv6 destination address; validation for 1204 * IPv6 destination address should have done enough 1205 * check for us. 1206 * 1207 * We do not do proxy at this moment. 1208 */ 1209 /* m_pulldown instead of copy? */ 1210 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1211 subjlen, &sin6.sin6_addr); 1212 if (in6_addr2zoneid(m->m_pkthdr.rcvif, 1213 &sin6.sin6_addr, &sin6.sin6_scope_id)) 1214 goto bad; 1215 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL); 1216 bzero(&sin6_d, sizeof(sin6_d)); 1217 sin6_d.sin6_family = AF_INET6; /* not used, actually */ 1218 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */ 1219 sin6_d.sin6_addr = ip6->ip6_dst; 1220 if (in6_addr2zoneid(m->m_pkthdr.rcvif, 1221 &ip6->ip6_dst, &sin6_d.sin6_scope_id)) 1222 goto bad; 1223 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL); 1224 subj = (char *)&sin6; 1225 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) 1226 break; 1227 1228 /* 1229 * XXX if we are to allow other cases, we should really 1230 * be careful about scope here. 1231 * basically, we should disallow queries toward IPv6 1232 * destination X with subject Y, if scope(X) > scope(Y). 1233 * if we allow scope(X) > scope(Y), it will result in 1234 * information leakage across scope boundary. 1235 */ 1236 goto bad; 1237 1238 case ICMP6_NI_SUBJ_FQDN: 1239 /* 1240 * Validate Subject name with gethostname(3). 1241 * 1242 * The behavior may need some debate, since: 1243 * - we are not sure if the node has FQDN as 1244 * hostname (returned by gethostname(3)). 1245 * - the code does wildcard match for truncated names. 1246 * however, we are not sure if we want to perform 1247 * wildcard match, if gethostname(3) side has 1248 * truncated hostname. 1249 */ 1250 n = ni6_nametodns(hostname, hostnamelen, 0); 1251 if (!n || n->m_next || n->m_len == 0) 1252 goto bad; 1253 IP6_EXTHDR_GET(subj, char *, m, 1254 off + sizeof(struct icmp6_nodeinfo), subjlen); 1255 if (subj == NULL) 1256 goto bad; 1257 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1258 n->m_len)) { 1259 goto bad; 1260 } 1261 m_freem(n); 1262 n = NULL; 1263 break; 1264 1265 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1266 default: 1267 goto bad; 1268 } 1269 break; 1270 } 1271 1272 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1273 switch (qtype) { 1274 case NI_QTYPE_FQDN: 1275 if ((icmp6_nodeinfo & 1) == 0) 1276 goto bad; 1277 break; 1278 case NI_QTYPE_NODEADDR: 1279 if ((icmp6_nodeinfo & 2) == 0) 1280 goto bad; 1281 break; 1282 } 1283 1284 /* guess reply length */ 1285 switch (qtype) { 1286 case NI_QTYPE_NOOP: 1287 break; /* no reply data */ 1288 case NI_QTYPE_SUPTYPES: 1289 replylen += sizeof(u_int32_t); 1290 break; 1291 case NI_QTYPE_FQDN: 1292 /* XXX will append an mbuf */ 1293 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1294 break; 1295 case NI_QTYPE_NODEADDR: 1296 addrs = ni6_addrs(ni6, m, &ifp, subj); 1297 if ((replylen += addrs * (sizeof(struct in6_addr) + 1298 sizeof(u_int32_t))) > MCLBYTES) 1299 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1300 break; 1301 default: 1302 /* 1303 * XXX: We must return a reply with the ICMP6 code 1304 * `unknown Qtype' in this case. However we regard the case 1305 * as an FQDN query for backward compatibility. 1306 * Older versions set a random value to this field, 1307 * so it rarely varies in the defined qtypes. 1308 * But the mechanism is not reliable... 1309 * maybe we should obsolete older versions. 1310 */ 1311 qtype = NI_QTYPE_FQDN; 1312 /* XXX will append an mbuf */ 1313 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1314 oldfqdn++; 1315 break; 1316 } 1317 1318 /* allocate an mbuf to reply. */ 1319 if (replylen > MCLBYTES) { 1320 /* 1321 * XXX: should we try to allocate more? But MCLBYTES 1322 * is probably much larger than IPV6_MMTU... 1323 */ 1324 goto bad; 1325 } 1326 n = m_getb(replylen, M_NOWAIT, m->m_type, M_PKTHDR); 1327 if (n == NULL) { 1328 m_freem(m); 1329 return (NULL); 1330 } 1331 M_MOVE_PKTHDR(n, m); /* just for recvif */ 1332 n->m_pkthdr.len = n->m_len = replylen; 1333 1334 /* copy mbuf header and IPv6 + Node Information base headers */ 1335 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1336 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1337 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1338 1339 /* qtype dependent procedure */ 1340 switch (qtype) { 1341 case NI_QTYPE_NOOP: 1342 nni6->ni_code = ICMP6_NI_SUCCESS; 1343 nni6->ni_flags = 0; 1344 break; 1345 case NI_QTYPE_SUPTYPES: 1346 { 1347 u_int32_t v; 1348 nni6->ni_code = ICMP6_NI_SUCCESS; 1349 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1350 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1351 v = (u_int32_t)htonl(0x0000000f); 1352 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1353 break; 1354 } 1355 case NI_QTYPE_FQDN: 1356 nni6->ni_code = ICMP6_NI_SUCCESS; 1357 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1358 sizeof(struct ip6_hdr) + 1359 sizeof(struct icmp6_nodeinfo)); 1360 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1361 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1362 /* 1363 * XXX do we really have FQDN in variable "hostname"? 1364 */ 1365 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1366 if (n->m_next == NULL) 1367 goto bad; 1368 /* XXX we assume that n->m_next is not a chain */ 1369 if (n->m_next->m_next != NULL) 1370 goto bad; 1371 n->m_pkthdr.len += n->m_next->m_len; 1372 break; 1373 case NI_QTYPE_NODEADDR: 1374 { 1375 int lenlim, copied; 1376 1377 nni6->ni_code = ICMP6_NI_SUCCESS; 1378 n->m_pkthdr.len = n->m_len = 1379 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1380 lenlim = M_TRAILINGSPACE(n); 1381 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1382 /* XXX: reset mbuf length */ 1383 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1384 sizeof(struct icmp6_nodeinfo) + copied; 1385 break; 1386 } 1387 default: 1388 break; /* XXX impossible! */ 1389 } 1390 1391 nni6->ni_type = ICMP6_NI_REPLY; 1392 m_freem(m); 1393 return (n); 1394 1395 bad: 1396 m_freem(m); 1397 if (n) 1398 m_freem(n); 1399 return (NULL); 1400 } 1401 #undef hostnamelen 1402 1403 /* 1404 * make a mbuf with DNS-encoded string. no compression support. 1405 * 1406 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1407 * treated as truncated name (two \0 at the end). this is a wild guess. 1408 */ 1409 static struct mbuf * 1410 ni6_nametodns(const char *name, int namelen, 1411 int old) /* return pascal string if non-zero */ 1412 { 1413 struct mbuf *m; 1414 char *cp, *ep; 1415 const char *p, *q; 1416 int i, len, nterm; 1417 1418 if (old) 1419 len = namelen + 1; 1420 else 1421 len = MCLBYTES; 1422 1423 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1424 m = m_getb(len, M_NOWAIT, MT_DATA, 0); 1425 if (!m) 1426 goto fail; 1427 1428 if (old) { 1429 m->m_len = len; 1430 *mtod(m, char *) = namelen; 1431 bcopy(name, mtod(m, char *) + 1, namelen); 1432 return m; 1433 } else { 1434 m->m_len = 0; 1435 cp = mtod(m, char *); 1436 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1437 1438 /* if not certain about my name, return empty buffer */ 1439 if (namelen == 0) 1440 return m; 1441 1442 /* 1443 * guess if it looks like shortened hostname, or FQDN. 1444 * shortened hostname needs two trailing "\0". 1445 */ 1446 i = 0; 1447 for (p = name; p < name + namelen; p++) { 1448 if (*p && *p == '.') 1449 i++; 1450 } 1451 if (i < 2) 1452 nterm = 2; 1453 else 1454 nterm = 1; 1455 1456 p = name; 1457 while (cp < ep && p < name + namelen) { 1458 i = 0; 1459 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1460 i++; 1461 /* result does not fit into mbuf */ 1462 if (cp + i + 1 >= ep) 1463 goto fail; 1464 /* 1465 * DNS label length restriction, RFC1035 page 8. 1466 * "i == 0" case is included here to avoid returning 1467 * 0-length label on "foo..bar". 1468 */ 1469 if (i <= 0 || i >= 64) 1470 goto fail; 1471 *cp++ = i; 1472 bcopy(p, cp, i); 1473 cp += i; 1474 p = q; 1475 if (p < name + namelen && *p == '.') 1476 p++; 1477 } 1478 /* termination */ 1479 if (cp + nterm >= ep) 1480 goto fail; 1481 while (nterm-- > 0) 1482 *cp++ = '\0'; 1483 m->m_len = cp - mtod(m, char *); 1484 return m; 1485 } 1486 1487 panic("should not reach here"); 1488 /* NOTREACHED */ 1489 1490 fail: 1491 if (m) 1492 m_freem(m); 1493 return NULL; 1494 } 1495 1496 /* 1497 * check if two DNS-encoded string matches. takes care of truncated 1498 * form (with \0\0 at the end). no compression support. 1499 * XXX upper/lowercase match (see RFC2065) 1500 */ 1501 static int 1502 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1503 { 1504 const char *a0, *b0; 1505 int l; 1506 1507 /* simplest case - need validation? */ 1508 if (alen == blen && bcmp(a, b, alen) == 0) 1509 return 1; 1510 1511 a0 = a; 1512 b0 = b; 1513 1514 /* termination is mandatory */ 1515 if (alen < 2 || blen < 2) 1516 return 0; 1517 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1518 return 0; 1519 alen--; 1520 blen--; 1521 1522 while (a - a0 < alen && b - b0 < blen) { 1523 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1524 return 0; 1525 1526 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1527 return 0; 1528 /* we don't support compression yet */ 1529 if (a[0] >= 64 || b[0] >= 64) 1530 return 0; 1531 1532 /* truncated case */ 1533 if (a[0] == 0 && a - a0 == alen - 1) 1534 return 1; 1535 if (b[0] == 0 && b - b0 == blen - 1) 1536 return 1; 1537 if (a[0] == 0 || b[0] == 0) 1538 return 0; 1539 1540 if (a[0] != b[0]) 1541 return 0; 1542 l = a[0]; 1543 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1544 return 0; 1545 if (bcmp(a + 1, b + 1, l) != 0) 1546 return 0; 1547 1548 a += 1 + l; 1549 b += 1 + l; 1550 } 1551 1552 if (a - a0 == alen && b - b0 == blen) 1553 return 1; 1554 else 1555 return 0; 1556 } 1557 1558 /* 1559 * calculate the number of addresses to be returned in the node info reply. 1560 */ 1561 static int 1562 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp, 1563 char *subj) 1564 { 1565 const struct ifnet_array *arr; 1566 struct in6_ifaddr *ifa6; 1567 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1568 int addrs = 0, addrsofif, iffound = 0; 1569 int niflags = ni6->ni_flags; 1570 int i; 1571 1572 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1573 switch (ni6->ni_code) { 1574 case ICMP6_NI_SUBJ_IPV6: 1575 if (subj == NULL) /* must be impossible... */ 1576 return (0); 1577 subj_ip6 = (struct sockaddr_in6 *)subj; 1578 break; 1579 default: 1580 /* 1581 * XXX: we only support IPv6 subject address for 1582 * this Qtype. 1583 */ 1584 return (0); 1585 } 1586 } 1587 1588 arr = ifnet_array_get(); 1589 for (i = 0; i < arr->ifnet_count; ++i) { 1590 struct ifnet *ifp = arr->ifnet_arr[i]; 1591 struct ifaddr_container *ifac; 1592 1593 addrsofif = 0; 1594 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) 1595 { 1596 struct ifaddr *ifa = ifac->ifa; 1597 1598 if (ifa->ifa_addr->sa_family != AF_INET6) 1599 continue; 1600 ifa6 = (struct in6_ifaddr *)ifa; 1601 1602 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1603 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1604 &ifa6->ia_addr.sin6_addr)) 1605 iffound = 1; 1606 1607 /* 1608 * IPv4-mapped addresses can only be returned by a 1609 * Node Information proxy, since they represent 1610 * addresses of IPv4-only nodes, which perforce do 1611 * not implement this protocol. 1612 * [icmp-name-lookups-07, Section 5.4] 1613 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1614 * this function at this moment. 1615 */ 1616 1617 /* What do we have to do about ::1? */ 1618 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1619 case IPV6_ADDR_SCOPE_LINKLOCAL: 1620 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1621 continue; 1622 break; 1623 case IPV6_ADDR_SCOPE_SITELOCAL: 1624 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1625 continue; 1626 break; 1627 case IPV6_ADDR_SCOPE_GLOBAL: 1628 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1629 continue; 1630 break; 1631 default: 1632 continue; 1633 } 1634 1635 /* 1636 * check if anycast is okay. 1637 * XXX: just experimental. not in the spec. 1638 */ 1639 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) && 1640 !(niflags & NI_NODEADDR_FLAG_ANYCAST)) 1641 continue; /* we need only unicast addresses */ 1642 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) && 1643 (icmp6_nodeinfo & 4) == 0) { 1644 continue; 1645 } 1646 addrsofif++; /* count the address */ 1647 } 1648 if (iffound) { 1649 *ifpp = ifp; 1650 return (addrsofif); 1651 } 1652 1653 addrs += addrsofif; 1654 } 1655 1656 return (addrs); 1657 } 1658 1659 static int 1660 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6, 1661 struct ifnet *ifp0, int resid) 1662 { 1663 const struct ifnet_array *arr; 1664 struct in6_ifaddr *ifa6; 1665 int copied = 0, allow_deprecated = 0; 1666 u_char *cp = (u_char *)(nni6 + 1); 1667 int niflags = ni6->ni_flags; 1668 u_int32_t ltime; 1669 int idx, idx_dep = -1; 1670 1671 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1672 return (0); /* needless to copy */ 1673 1674 arr = ifnet_array_get(); 1675 if (ifp0 == NULL) { 1676 idx = 0; 1677 } else { 1678 for (idx = 0; idx < arr->ifnet_count; ++idx) { 1679 if (arr->ifnet_arr[idx] == ifp0) 1680 break; 1681 } 1682 } 1683 1684 again: 1685 1686 for (; idx < arr->ifnet_count; ++idx) { 1687 struct ifnet *ifp = arr->ifnet_arr[idx]; 1688 struct ifaddr_container *ifac; 1689 1690 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1691 struct ifaddr *ifa = ifac->ifa; 1692 1693 if (ifa->ifa_addr->sa_family != AF_INET6) 1694 continue; 1695 ifa6 = (struct in6_ifaddr *)ifa; 1696 1697 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) && 1698 allow_deprecated == 0) { 1699 /* 1700 * prefererred address should be put before 1701 * deprecated addresses. 1702 */ 1703 1704 /* record the interface for later search */ 1705 if (idx_dep < 0) 1706 idx_dep = idx; 1707 1708 continue; 1709 } 1710 else if (!(ifa6->ia6_flags & IN6_IFF_DEPRECATED) && 1711 allow_deprecated != 0) 1712 continue; /* we now collect deprecated addrs */ 1713 1714 /* What do we have to do about ::1? */ 1715 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1716 case IPV6_ADDR_SCOPE_LINKLOCAL: 1717 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1718 continue; 1719 break; 1720 case IPV6_ADDR_SCOPE_SITELOCAL: 1721 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1722 continue; 1723 break; 1724 case IPV6_ADDR_SCOPE_GLOBAL: 1725 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1726 continue; 1727 break; 1728 default: 1729 continue; 1730 } 1731 1732 /* 1733 * check if anycast is okay. 1734 * XXX: just experimental. not in the spec. 1735 */ 1736 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) && 1737 !(niflags & NI_NODEADDR_FLAG_ANYCAST)) 1738 continue; 1739 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) && 1740 (icmp6_nodeinfo & 4) == 0) { 1741 continue; 1742 } 1743 1744 /* now we can copy the address */ 1745 if (resid < sizeof(struct in6_addr) + 1746 sizeof(u_int32_t)) { 1747 /* 1748 * We give up much more copy. 1749 * Set the truncate flag and return. 1750 */ 1751 nni6->ni_flags |= 1752 NI_NODEADDR_FLAG_TRUNCATE; 1753 return (copied); 1754 } 1755 1756 /* 1757 * Set the TTL of the address. 1758 * The TTL value should be one of the following 1759 * according to the specification: 1760 * 1761 * 1. The remaining lifetime of a DHCP lease on the 1762 * address, or 1763 * 2. The remaining Valid Lifetime of a prefix from 1764 * which the address was derived through Stateless 1765 * Autoconfiguration. 1766 * 1767 * Note that we currently do not support stateful 1768 * address configuration by DHCPv6, so the former 1769 * case can't happen. 1770 */ 1771 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1772 ltime = ND6_INFINITE_LIFETIME; 1773 else { 1774 if (ifa6->ia6_lifetime.ia6t_expire > 1775 time_uptime) 1776 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime); 1777 else 1778 ltime = 0; 1779 } 1780 1781 bcopy(<ime, cp, sizeof(u_int32_t)); 1782 cp += sizeof(u_int32_t); 1783 1784 /* copy the address itself */ 1785 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1786 sizeof(struct in6_addr)); 1787 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1788 cp += sizeof(struct in6_addr); 1789 1790 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1791 copied += (sizeof(struct in6_addr) + 1792 sizeof(u_int32_t)); 1793 } 1794 if (ifp0) /* we need search only on the specified IF */ 1795 break; 1796 } 1797 1798 if (allow_deprecated == 0 && idx_dep >= 0) { 1799 idx = idx_dep; 1800 allow_deprecated = 1; 1801 1802 goto again; 1803 } 1804 1805 return (copied); 1806 } 1807 1808 /* 1809 * XXX almost dup'ed code with rip6_input. 1810 */ 1811 static int 1812 icmp6_rip6_input(struct mbuf **mp, int off) 1813 { 1814 struct mbuf *m = *mp; 1815 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1816 struct in6pcb *in6p; 1817 struct in6pcb *last = NULL; 1818 struct sockaddr_in6 fromsa; 1819 struct icmp6_hdr *icmp6; 1820 struct mbuf *opts = NULL; 1821 1822 #ifndef PULLDOWN_TEST 1823 /* this is assumed to be safe. */ 1824 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1825 #else 1826 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1827 if (icmp6 == NULL) { 1828 /* m is already reclaimed */ 1829 return IPPROTO_DONE; 1830 } 1831 #endif 1832 1833 bzero(&fromsa, sizeof(fromsa)); 1834 fromsa.sin6_len = sizeof(struct sockaddr_in6); 1835 fromsa.sin6_family = AF_INET6; 1836 /* KAME hack: recover scopeid */ 1837 in6_recoverscope(&fromsa, &ip6->ip6_src, m->m_pkthdr.rcvif); 1838 1839 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list) 1840 { 1841 if (in6p->inp_flags & INP_PLACEMARKER) 1842 continue; 1843 if (!INP_ISIPV6(in6p)) 1844 continue; 1845 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1846 continue; 1847 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1848 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1849 continue; 1850 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1851 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1852 continue; 1853 if (in6p->in6p_icmp6filt 1854 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1855 in6p->in6p_icmp6filt)) 1856 continue; 1857 if (last) { 1858 struct socket *so; 1859 struct mbuf *n; 1860 1861 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != NULL) { 1862 if (last->in6p_flags & IN6P_CONTROLOPTS) 1863 ip6_savecontrol(last, &opts, ip6, n); 1864 /* strip intermediate headers */ 1865 m_adj(n, off); 1866 so = last->in6p_socket; 1867 lwkt_gettoken(&so->so_rcv.ssb_token); 1868 if (ssb_appendaddr(&so->so_rcv, 1869 (struct sockaddr *)&fromsa, n, opts) == 0) { 1870 m_freem(n); 1871 if (opts) 1872 m_freem(opts); 1873 soroverflow(so); 1874 } else { 1875 sorwakeup(so); 1876 } 1877 lwkt_reltoken(&so->so_rcv.ssb_token); 1878 opts = NULL; 1879 } 1880 } 1881 last = in6p; 1882 } 1883 if (last) { 1884 struct socket *so; 1885 1886 if (last->in6p_flags & IN6P_CONTROLOPTS) 1887 ip6_savecontrol(last, &opts, ip6, m); 1888 /* strip intermediate headers */ 1889 m_adj(m, off); 1890 so = last->in6p_socket; 1891 lwkt_gettoken(&so->so_rcv.ssb_token); 1892 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&fromsa, 1893 m, opts) == 0) { 1894 m_freem(m); 1895 if (opts) 1896 m_freem(opts); 1897 soroverflow(so); 1898 } else { 1899 sorwakeup(so); 1900 } 1901 lwkt_reltoken(&so->so_rcv.ssb_token); 1902 } else { 1903 m_freem(m); 1904 ip6stat.ip6s_delivered--; 1905 } 1906 return IPPROTO_DONE; 1907 } 1908 1909 /* 1910 * Reflect the ip6 packet back to the source. 1911 * OFF points to the icmp6 header, counted from the top of the mbuf. 1912 */ 1913 void 1914 icmp6_reflect(struct mbuf *m, size_t off) 1915 { 1916 struct ip6_hdr *ip6; 1917 struct icmp6_hdr *icmp6; 1918 struct in6_ifaddr *ia; 1919 struct in6_addr t, *src = NULL; 1920 int plen; 1921 int type, code; 1922 struct ifnet *outif = NULL; 1923 struct sockaddr_in6 sa6_src, sa6_dst; 1924 #ifdef COMPAT_RFC1885 1925 int mtu = IPV6_MMTU; 1926 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 1927 #endif 1928 1929 /* too short to reflect */ 1930 if (off < sizeof(struct ip6_hdr)) { 1931 nd6log((LOG_DEBUG, 1932 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 1933 (u_long)off, (u_long)sizeof(struct ip6_hdr), 1934 __FILE__, __LINE__)); 1935 goto bad; 1936 } 1937 1938 /* 1939 * If there are extra headers between IPv6 and ICMPv6, strip 1940 * off that header first. 1941 */ 1942 #ifdef DIAGNOSTIC 1943 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 1944 panic("assumption failed in icmp6_reflect"); 1945 #endif 1946 if (off > sizeof(struct ip6_hdr)) { 1947 size_t l; 1948 struct ip6_hdr nip6; 1949 1950 l = off - sizeof(struct ip6_hdr); 1951 m_copydata(m, 0, sizeof(nip6), &nip6); 1952 m_adj(m, l); 1953 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1954 if (m->m_len < l) { 1955 if ((m = m_pullup(m, l)) == NULL) 1956 return; 1957 } 1958 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 1959 } else /* off == sizeof(struct ip6_hdr) */ { 1960 size_t l; 1961 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1962 if (m->m_len < l) { 1963 if ((m = m_pullup(m, l)) == NULL) 1964 return; 1965 } 1966 } 1967 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 1968 ip6 = mtod(m, struct ip6_hdr *); 1969 ip6->ip6_nxt = IPPROTO_ICMPV6; 1970 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 1971 type = icmp6->icmp6_type; /* keep type for statistics */ 1972 code = icmp6->icmp6_code; /* ditto. */ 1973 1974 t = ip6->ip6_dst; 1975 /* 1976 * ip6_input() drops a packet if its src is multicast. 1977 * So, the src is never multicast. 1978 */ 1979 ip6->ip6_dst = ip6->ip6_src; 1980 1981 /* 1982 * XXX: make sure to embed scope zone information, using 1983 * already embedded IDs or the received interface (if any). 1984 * Note that rcvif may be NULL. 1985 * TODO: scoped routing case (XXX). 1986 */ 1987 bzero(&sa6_src, sizeof(sa6_src)); 1988 sa6_src.sin6_family = AF_INET6; 1989 sa6_src.sin6_len = sizeof(sa6_src); 1990 sa6_src.sin6_addr = ip6->ip6_dst; 1991 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 1992 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL); 1993 bzero(&sa6_dst, sizeof(sa6_dst)); 1994 sa6_dst.sin6_family = AF_INET6; 1995 sa6_dst.sin6_len = sizeof(sa6_dst); 1996 sa6_dst.sin6_addr = t; 1997 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 1998 in6_embedscope(&t, &sa6_dst, NULL, NULL); 1999 2000 #ifdef COMPAT_RFC1885 2001 /* 2002 * xxx guess MTU 2003 * RFC 1885 requires that echo reply should be truncated if it 2004 * does not fit in with (return) path MTU, but the description was 2005 * removed in the new spec. 2006 */ 2007 if (icmp6_reflect_rt.ro_rt == 0 || 2008 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 2009 if (icmp6_reflect_rt.ro_rt) { 2010 RTFREE(icmp6_reflect_rt.ro_rt); 2011 icmp6_reflect_rt.ro_rt = 0; 2012 } 2013 bzero(sin6, sizeof(*sin6)); 2014 sin6->sin6_family = PF_INET6; 2015 sin6->sin6_len = sizeof(struct sockaddr_in6); 2016 sin6->sin6_addr = ip6->ip6_dst; 2017 2018 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt, 2019 RTF_PRCLONING); 2020 } 2021 2022 if (icmp6_reflect_rt.ro_rt == 0) 2023 goto bad; 2024 2025 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 2026 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 2027 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 2028 2029 if (mtu < m->m_pkthdr.len) { 2030 plen -= (m->m_pkthdr.len - mtu); 2031 m_adj(m, mtu - m->m_pkthdr.len); 2032 } 2033 #endif 2034 /* 2035 * If the incoming packet was addressed directly to us(i.e. unicast), 2036 * use dst as the src for the reply. 2037 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 2038 * (for example) when we encounter an error while forwarding procedure 2039 * destined to a duplicated address of ours. 2040 */ 2041 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2042 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2043 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2044 src = &t; 2045 break; 2046 } 2047 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2048 /* 2049 * This is the case if the dst is our link-local address 2050 * and the sender is also ourselves. 2051 */ 2052 src = &t; 2053 } 2054 2055 if (src == NULL) { 2056 int e; 2057 struct route_in6 ro; 2058 2059 /* 2060 * This case matches to multicasts, our anycast, or unicasts 2061 * that we do not own. Select a source address based on the 2062 * source address of the erroneous packet. 2063 */ 2064 bzero(&ro, sizeof(ro)); 2065 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e, NULL); 2066 if (ro.ro_rt) 2067 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2068 if (src == NULL) { 2069 nd6log((LOG_DEBUG, 2070 "icmp6_reflect: source can't be determined: " 2071 "dst=%s, error=%d\n", 2072 ip6_sprintf(&sa6_src.sin6_addr), e)); 2073 goto bad; 2074 } 2075 } 2076 2077 ip6->ip6_src = *src; 2078 2079 ip6->ip6_flow = 0; 2080 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2081 ip6->ip6_vfc |= IPV6_VERSION; 2082 ip6->ip6_nxt = IPPROTO_ICMPV6; 2083 if (m->m_pkthdr.rcvif) { 2084 /* XXX: This may not be the outgoing interface */ 2085 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 2086 if (ip6->ip6_hlim < ip6_minhlim) 2087 ip6->ip6_hlim = ip6_minhlim; 2088 } else { 2089 ip6->ip6_hlim = ip6_defhlim; 2090 } 2091 2092 icmp6->icmp6_cksum = 0; 2093 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2094 sizeof(struct ip6_hdr), plen); 2095 2096 /* 2097 * XXX option handling 2098 */ 2099 2100 m->m_flags &= ~(M_BCAST|M_MCAST); 2101 2102 #ifdef COMPAT_RFC1885 2103 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL); 2104 #else 2105 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2106 #endif 2107 if (outif) 2108 icmp6_ifoutstat_inc(outif, type, code); 2109 2110 return; 2111 2112 bad: 2113 m_freem(m); 2114 return; 2115 } 2116 2117 static void 2118 icmp6_fasttimo_dispatch(netmsg_t nmsg) 2119 { 2120 2121 ASSERT_NETISR0; 2122 2123 /* Reply ASAP. */ 2124 crit_enter(); 2125 netisr_replymsg(&nmsg->base, 0); 2126 crit_exit(); 2127 2128 mld6_fasttimeo(); 2129 2130 callout_reset(&icmp6_fasttimo_ch, ICMP6_FASTTIMO, icmp6_fasttimo, NULL); 2131 } 2132 2133 static void 2134 icmp6_fasttimo(void *dummy __unused) 2135 { 2136 struct netmsg_base *nmsg = &icmp6_fasttimo_nmsg; 2137 2138 KKASSERT(mycpuid == 0); 2139 2140 crit_enter(); 2141 if (nmsg->lmsg.ms_flags & MSGF_DONE) 2142 netisr_sendmsg_oncpu(nmsg); 2143 crit_exit(); 2144 } 2145 2146 static const char * 2147 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 2148 struct in6_addr *tgt6) 2149 { 2150 static char buf[1024]; 2151 ksnprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2152 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2153 return buf; 2154 } 2155 2156 void 2157 icmp6_redirect_input(struct mbuf *m, int off) 2158 { 2159 struct ifnet *ifp = m->m_pkthdr.rcvif; 2160 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2161 struct nd_redirect *nd_rd; 2162 int icmp6len = ntohs(ip6->ip6_plen); 2163 char *lladdr = NULL; 2164 int lladdrlen = 0; 2165 #if 0 2166 u_char *redirhdr = NULL; 2167 int redirhdrlen = 0; 2168 #endif 2169 struct rtentry *rt = NULL; 2170 int is_router; 2171 int is_onlink; 2172 struct in6_addr src6 = ip6->ip6_src; 2173 struct in6_addr redtgt6; 2174 struct in6_addr reddst6; 2175 union nd_opts ndopts; 2176 2177 if (!m || !ifp) 2178 return; 2179 2180 /* XXX if we are router, we don't update route by icmp6 redirect */ 2181 if (ip6_forwarding) 2182 goto freeit; 2183 if (!icmp6_rediraccept) 2184 goto freeit; 2185 2186 #ifndef PULLDOWN_TEST 2187 IP6_EXTHDR_CHECK(m, off, icmp6len,); 2188 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2189 #else 2190 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2191 if (nd_rd == NULL) { 2192 icmp6stat.icp6s_tooshort++; 2193 return; 2194 } 2195 #endif 2196 redtgt6 = nd_rd->nd_rd_target; 2197 reddst6 = nd_rd->nd_rd_dst; 2198 2199 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2200 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2201 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2202 reddst6.s6_addr16[1] = htons(ifp->if_index); 2203 2204 /* validation */ 2205 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2206 nd6log((LOG_ERR, 2207 "ICMP6 redirect sent from %s rejected; " 2208 "must be from linklocal\n", ip6_sprintf(&src6))); 2209 goto bad; 2210 } 2211 if (ip6->ip6_hlim != 255) { 2212 nd6log((LOG_ERR, 2213 "ICMP6 redirect sent from %s rejected; " 2214 "hlim=%d (must be 255)\n", 2215 ip6_sprintf(&src6), ip6->ip6_hlim)); 2216 goto bad; 2217 } 2218 { 2219 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2220 struct sockaddr_in6 sin6; 2221 struct in6_addr *gw6; 2222 2223 bzero(&sin6, sizeof(sin6)); 2224 sin6.sin6_family = AF_INET6; 2225 sin6.sin6_len = sizeof(struct sockaddr_in6); 2226 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6); 2227 rt = rtpurelookup((struct sockaddr *)&sin6); 2228 if (rt != NULL) { 2229 if (rt->rt_gateway == NULL || 2230 rt->rt_gateway->sa_family != AF_INET6) { 2231 nd6log((LOG_ERR, 2232 "ICMP6 redirect rejected; no route " 2233 "with inet6 gateway found for redirect dst: %s\n", 2234 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2235 --rt->rt_refcnt; 2236 goto bad; 2237 } 2238 2239 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2240 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2241 nd6log((LOG_ERR, 2242 "ICMP6 redirect rejected; " 2243 "not equal to gw-for-src=%s (must be same): " 2244 "%s\n", 2245 ip6_sprintf(gw6), 2246 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2247 --rt->rt_refcnt; 2248 goto bad; 2249 } 2250 } else { 2251 nd6log((LOG_ERR, 2252 "ICMP6 redirect rejected; " 2253 "no route found for redirect dst: %s\n", 2254 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2255 goto bad; 2256 } 2257 --rt->rt_refcnt; 2258 rt = NULL; 2259 } 2260 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2261 nd6log((LOG_ERR, 2262 "ICMP6 redirect rejected; " 2263 "redirect dst must be unicast: %s\n", 2264 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2265 goto bad; 2266 } 2267 2268 is_router = is_onlink = 0; 2269 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2270 is_router = 1; /* router case */ 2271 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2272 is_onlink = 1; /* on-link destination case */ 2273 if (!is_router && !is_onlink) { 2274 nd6log((LOG_ERR, 2275 "ICMP6 redirect rejected; " 2276 "neither router case nor onlink case: %s\n", 2277 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2278 goto bad; 2279 } 2280 /* validation passed */ 2281 2282 icmp6len -= sizeof(*nd_rd); 2283 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2284 if (nd6_options(&ndopts) < 0) { 2285 nd6log((LOG_INFO, "icmp6_redirect_input: " 2286 "invalid ND option, rejected: %s\n", 2287 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2288 /* nd6_options have incremented stats */ 2289 goto freeit; 2290 } 2291 2292 if (ndopts.nd_opts_tgt_lladdr) { 2293 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2294 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2295 } 2296 2297 #if 0 2298 if (ndopts.nd_opts_rh) { 2299 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2300 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2301 } 2302 #endif 2303 2304 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2305 nd6log((LOG_INFO, 2306 "icmp6_redirect_input: lladdrlen mismatch for %s " 2307 "(if %d, icmp6 packet %d): %s\n", 2308 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2309 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2310 goto bad; 2311 } 2312 2313 /* RFC 2461 8.3 */ 2314 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2315 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2316 2317 if (!is_onlink) { /* better router case. perform rtredirect. */ 2318 /* perform rtredirect */ 2319 struct sockaddr_in6 sdst; 2320 struct sockaddr_in6 sgw; 2321 struct sockaddr_in6 ssrc; 2322 2323 bzero(&sdst, sizeof(sdst)); 2324 bzero(&sgw, sizeof(sgw)); 2325 bzero(&ssrc, sizeof(ssrc)); 2326 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2327 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2328 sizeof(struct sockaddr_in6); 2329 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2330 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2331 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2332 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2333 NULL, RTF_GATEWAY | RTF_HOST, 2334 (struct sockaddr *)&ssrc); 2335 } 2336 /* finally update cached route in each socket via kpfctlinput */ 2337 { 2338 struct sockaddr_in6 sdst; 2339 2340 bzero(&sdst, sizeof(sdst)); 2341 sdst.sin6_family = AF_INET6; 2342 sdst.sin6_len = sizeof(struct sockaddr_in6); 2343 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2344 kpfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2345 } 2346 2347 freeit: 2348 m_freem(m); 2349 return; 2350 2351 bad: 2352 icmp6stat.icp6s_badredirect++; 2353 m_freem(m); 2354 } 2355 2356 void 2357 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2358 { 2359 struct ifnet *ifp; /* my outgoing interface */ 2360 struct in6_addr *ifp_ll6; 2361 struct in6_addr *router_ll6; 2362 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2363 struct mbuf *m = NULL; /* newly allocated one */ 2364 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2365 struct nd_redirect *nd_rd; 2366 size_t maxlen; 2367 u_char *p; 2368 struct ifnet *outif = NULL; 2369 struct sockaddr_in6 src_sa; 2370 2371 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2372 2373 /* if we are not router, we don't send icmp6 redirect */ 2374 if (!ip6_forwarding) 2375 goto fail; 2376 2377 /* sanity check */ 2378 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2379 goto fail; 2380 2381 /* 2382 * Address check: 2383 * the source address must identify a neighbor, and 2384 * the destination address must not be a multicast address 2385 * [RFC 2461, sec 8.2] 2386 */ 2387 sip6 = mtod(m0, struct ip6_hdr *); 2388 bzero(&src_sa, sizeof(src_sa)); 2389 src_sa.sin6_family = AF_INET6; 2390 src_sa.sin6_len = sizeof(src_sa); 2391 src_sa.sin6_addr = sip6->ip6_src; 2392 /* we don't currently use sin6_scope_id, but eventually use it */ 2393 if (in6_addr2zoneid(ifp, &sip6->ip6_src, &src_sa.sin6_scope_id)) 2394 goto fail; 2395 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2396 goto fail; 2397 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2398 goto fail; /* what should we do here? */ 2399 2400 /* rate limit */ 2401 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2402 goto fail; 2403 2404 /* 2405 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2406 * we almost always ask for an mbuf cluster for simplicity. 2407 * (MHLEN < IPV6_MMTU is almost always true) 2408 */ 2409 #if IPV6_MMTU >= MCLBYTES 2410 # error assumption failed about IPV6_MMTU and MCLBYTES 2411 #endif 2412 m = m_getb(IPV6_MMTU, M_NOWAIT, MT_HEADER, M_PKTHDR); 2413 if (!m) 2414 goto fail; 2415 m->m_len = 0; 2416 maxlen = M_TRAILINGSPACE(m); 2417 maxlen = min(IPV6_MMTU, maxlen); 2418 /* just for safety */ 2419 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2420 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2421 goto fail; 2422 } 2423 2424 { 2425 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2426 struct in6_ifaddr *ia; 2427 if ((ia = in6ifa_ifpforlinklocal(ifp, 2428 IN6_IFF_NOTREADY| 2429 IN6_IFF_ANYCAST)) == NULL) 2430 goto fail; 2431 ifp_ll6 = &ia->ia_addr.sin6_addr; 2432 } 2433 2434 /* get ip6 linklocal address for the router. */ 2435 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2436 struct sockaddr_in6 *sin6; 2437 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2438 router_ll6 = &sin6->sin6_addr; 2439 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2440 router_ll6 = NULL; 2441 } else 2442 router_ll6 = NULL; 2443 2444 /* ip6 */ 2445 ip6 = mtod(m, struct ip6_hdr *); 2446 ip6->ip6_flow = 0; 2447 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2448 ip6->ip6_vfc |= IPV6_VERSION; 2449 /* ip6->ip6_plen will be set later */ 2450 ip6->ip6_nxt = IPPROTO_ICMPV6; 2451 ip6->ip6_hlim = 255; 2452 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2453 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2454 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2455 2456 /* ND Redirect */ 2457 nd_rd = (struct nd_redirect *)(ip6 + 1); 2458 nd_rd->nd_rd_type = ND_REDIRECT; 2459 nd_rd->nd_rd_code = 0; 2460 nd_rd->nd_rd_reserved = 0; 2461 if (rt->rt_flags & RTF_GATEWAY) { 2462 /* 2463 * nd_rd->nd_rd_target must be a link-local address in 2464 * better router cases. 2465 */ 2466 if (!router_ll6) 2467 goto fail; 2468 bcopy(router_ll6, &nd_rd->nd_rd_target, 2469 sizeof(nd_rd->nd_rd_target)); 2470 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2471 sizeof(nd_rd->nd_rd_dst)); 2472 } else { 2473 /* make sure redtgt == reddst */ 2474 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2475 sizeof(nd_rd->nd_rd_target)); 2476 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2477 sizeof(nd_rd->nd_rd_dst)); 2478 } 2479 2480 p = (u_char *)(nd_rd + 1); 2481 2482 if (!router_ll6) 2483 goto nolladdropt; 2484 2485 { 2486 /* target lladdr option */ 2487 struct rtentry *rt_router = NULL; 2488 int len; 2489 struct sockaddr_dl *sdl; 2490 struct nd_opt_hdr *nd_opt; 2491 char *lladdr; 2492 2493 rt_router = nd6_lookup(router_ll6, 0, ifp); 2494 if (!rt_router) 2495 goto nolladdropt; 2496 len = sizeof(*nd_opt) + ifp->if_addrlen; 2497 len = (len + 7) & ~7; /* round by 8 */ 2498 /* safety check */ 2499 if (len + (p - (u_char *)ip6) > maxlen) 2500 goto nolladdropt; 2501 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2502 (rt_router->rt_flags & RTF_LLINFO) && 2503 (rt_router->rt_gateway->sa_family == AF_LINK) && 2504 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2505 sdl->sdl_alen) { 2506 nd_opt = (struct nd_opt_hdr *)p; 2507 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2508 nd_opt->nd_opt_len = len >> 3; 2509 lladdr = (char *)(nd_opt + 1); 2510 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2511 p += len; 2512 } 2513 } 2514 nolladdropt:; 2515 2516 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2517 2518 /* just to be safe */ 2519 #ifdef M_DECRYPTED /*not openbsd*/ 2520 if (m0->m_flags & M_DECRYPTED) 2521 goto noredhdropt; 2522 #endif 2523 if (p - (u_char *)ip6 > maxlen) 2524 goto noredhdropt; 2525 2526 { 2527 /* redirected header option */ 2528 int len; 2529 struct nd_opt_rd_hdr *nd_opt_rh; 2530 2531 /* 2532 * compute the maximum size for icmp6 redirect header option. 2533 * XXX room for auth header? 2534 */ 2535 len = maxlen - (p - (u_char *)ip6); 2536 len &= ~7; 2537 2538 /* This is just for simplicity. */ 2539 if (m0->m_pkthdr.len != m0->m_len) { 2540 if (m0->m_next) { 2541 m_freem(m0->m_next); 2542 m0->m_next = NULL; 2543 } 2544 m0->m_pkthdr.len = m0->m_len; 2545 } 2546 2547 /* 2548 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2549 * about padding/truncate rule for the original IP packet. 2550 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2551 * - "attach as much as possible" is the goal 2552 * - pad if not aligned (original size can be guessed by original 2553 * ip6 header) 2554 * Following code adds the padding if it is simple enough, 2555 * and truncates if not. 2556 */ 2557 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2558 panic("assumption failed in %s:%d", __FILE__, __LINE__); 2559 2560 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2561 /* not enough room, truncate */ 2562 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2563 } else { 2564 /* enough room, pad or truncate */ 2565 size_t extra; 2566 2567 extra = m0->m_pkthdr.len % 8; 2568 if (extra) { 2569 /* pad if easy enough, truncate if not */ 2570 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2571 /* pad */ 2572 m0->m_len += (8 - extra); 2573 m0->m_pkthdr.len += (8 - extra); 2574 } else { 2575 /* truncate */ 2576 m0->m_pkthdr.len -= extra; 2577 m0->m_len -= extra; 2578 } 2579 } 2580 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2581 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2582 } 2583 2584 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2585 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2586 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2587 nd_opt_rh->nd_opt_rh_len = len >> 3; 2588 p += sizeof(*nd_opt_rh); 2589 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2590 2591 /* connect m0 to m */ 2592 m->m_next = m0; 2593 m->m_pkthdr.len = m->m_len + m0->m_len; 2594 m0 = NULL; 2595 } 2596 noredhdropt:; 2597 if (m0 != NULL) { 2598 m_freem(m0); 2599 m0 = NULL; 2600 } 2601 2602 /* XXX: clear embedded link IDs in the inner header */ 2603 in6_clearscope(&sip6->ip6_src); 2604 in6_clearscope(&sip6->ip6_dst); 2605 in6_clearscope(&nd_rd->nd_rd_target); 2606 in6_clearscope(&nd_rd->nd_rd_dst); 2607 2608 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2609 2610 nd_rd->nd_rd_cksum = 0; 2611 nd_rd->nd_rd_cksum 2612 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2613 2614 /* send the packet to outside... */ 2615 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2616 if (outif) { 2617 icmp6_ifstat_inc(outif, ifs6_out_msg); 2618 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2619 } 2620 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2621 2622 return; 2623 2624 fail: 2625 if (m) 2626 m_freem(m); 2627 if (m0) 2628 m_freem(m0); 2629 } 2630 2631 #ifdef HAVE_NRL_INPCB 2632 #define in6pcb inpcb 2633 #define in6p_icmp6filt inp_icmp6filt 2634 #endif 2635 /* 2636 * ICMPv6 socket option processing. 2637 */ 2638 void 2639 icmp6_ctloutput(netmsg_t msg) 2640 { 2641 struct socket *so = msg->ctloutput.base.nm_so; 2642 struct sockopt *sopt = msg->ctloutput.nm_sopt; 2643 int error = 0; 2644 int optlen; 2645 struct inpcb *inp = so->so_pcb; 2646 int level, op, optname; 2647 2648 if (sopt) { 2649 level = sopt->sopt_level; 2650 op = sopt->sopt_dir; 2651 optname = sopt->sopt_name; 2652 optlen = sopt->sopt_valsize; 2653 } else 2654 level = op = optname = optlen = 0; 2655 2656 if (level != IPPROTO_ICMPV6) { 2657 error = EINVAL; 2658 goto out; 2659 } 2660 2661 switch (op) { 2662 case PRCO_SETOPT: 2663 switch (optname) { 2664 case ICMP6_FILTER: 2665 { 2666 if (optlen != sizeof(struct icmp6_filter)) { 2667 error = EMSGSIZE; 2668 break; 2669 } 2670 if (inp->in6p_icmp6filt == NULL) { 2671 error = EINVAL; 2672 break; 2673 } 2674 error = soopt_to_kbuf(sopt, inp->in6p_icmp6filt, optlen, 2675 optlen); 2676 break; 2677 } 2678 2679 default: 2680 error = ENOPROTOOPT; 2681 break; 2682 } 2683 break; 2684 2685 case PRCO_GETOPT: 2686 switch (optname) { 2687 case ICMP6_FILTER: 2688 { 2689 if (inp->in6p_icmp6filt == NULL) { 2690 error = EINVAL; 2691 break; 2692 } 2693 soopt_from_kbuf(sopt, inp->in6p_icmp6filt, 2694 sizeof(struct icmp6_filter)); 2695 break; 2696 } 2697 2698 default: 2699 error = ENOPROTOOPT; 2700 break; 2701 } 2702 break; 2703 } 2704 out: 2705 lwkt_replymsg(&msg->ctloutput.base.lmsg, error); 2706 } 2707 #ifdef HAVE_NRL_INPCB 2708 #undef in6pcb 2709 #undef in6p_icmp6filt 2710 #endif 2711 2712 #ifndef HAVE_PPSRATECHECK 2713 #ifndef timersub 2714 #define timersub(tvp, uvp, vvp) \ 2715 do { \ 2716 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ 2717 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ 2718 if ((vvp)->tv_usec < 0) { \ 2719 (vvp)->tv_sec--; \ 2720 (vvp)->tv_usec += 1000000; \ 2721 } \ 2722 } while (0) 2723 #endif 2724 2725 /* 2726 * ppsratecheck(): packets (or events) per second limitation. 2727 */ 2728 static int 2729 ppsratecheck(struct timeval *lasttime, int *curpps, 2730 int maxpps) /* maximum pps allowed */ 2731 { 2732 struct timeval tv, delta; 2733 int rv; 2734 2735 microtime(&tv); 2736 2737 timersub(&tv, lasttime, &delta); 2738 2739 /* 2740 * Check for 0,0 so that the message will be seen at least once. 2741 * If more than one second has passed since the last update of 2742 * lasttime, reset the counter. 2743 * 2744 * We do increment *curpps even in *curpps < maxpps case, as some may 2745 * try to use *curpps for stat purposes as well. 2746 */ 2747 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) || 2748 delta.tv_sec >= 1) { 2749 *lasttime = tv; 2750 *curpps = 0; 2751 rv = 1; 2752 } else if (maxpps < 0) 2753 rv = 1; 2754 else if (*curpps < maxpps) 2755 rv = 1; 2756 else 2757 rv = 0; 2758 2759 #if 1 /* DIAGNOSTIC? */ 2760 /* be careful about wrap-around */ 2761 if (*curpps + 1 > *curpps) 2762 *curpps = *curpps + 1; 2763 #else 2764 /* 2765 * assume that there's not too many calls to this function. 2766 * not sure if the assumption holds, as it depends on *caller's* 2767 * behavior, not the behavior of this function. 2768 * IMHO it is wrong to make assumption on the caller's behavior, 2769 * so the above #if is #if 1, not #ifdef DIAGNOSTIC. 2770 */ 2771 *curpps = *curpps + 1; 2772 #endif 2773 2774 return (rv); 2775 } 2776 #endif 2777 2778 /* 2779 * Perform rate limit check. 2780 * Returns 0 if it is okay to send the icmp6 packet. 2781 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2782 * limitation. 2783 * 2784 * XXX per-destination/type check necessary? 2785 */ 2786 static int 2787 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */ 2788 const int type, /* not used at this moment */ 2789 const int code) /* not used at this moment */ 2790 { 2791 int ret; 2792 2793 ret = 0; /* okay to send */ 2794 2795 /* PPS limit */ 2796 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2797 icmp6errppslim)) { 2798 /* The packet is subject to rate limit */ 2799 ret++; 2800 } 2801 2802 return ret; 2803 } 2804