| 1 | /* $NetBSD: icmp6.c,v 1.201 2016/11/15 20:50:28 mlelstv Exp $ */ |
| 2 | /* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of the project nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 30 | * SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | /* |
| 34 | * Copyright (c) 1982, 1986, 1988, 1993 |
| 35 | * The Regents of the University of California. All rights reserved. |
| 36 | * |
| 37 | * Redistribution and use in source and binary forms, with or without |
| 38 | * modification, are permitted provided that the following conditions |
| 39 | * are met: |
| 40 | * 1. Redistributions of source code must retain the above copyright |
| 41 | * notice, this list of conditions and the following disclaimer. |
| 42 | * 2. Redistributions in binary form must reproduce the above copyright |
| 43 | * notice, this list of conditions and the following disclaimer in the |
| 44 | * documentation and/or other materials provided with the distribution. |
| 45 | * 3. Neither the name of the University nor the names of its contributors |
| 46 | * may be used to endorse or promote products derived from this software |
| 47 | * without specific prior written permission. |
| 48 | * |
| 49 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 50 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 51 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 52 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 53 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 54 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 55 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 56 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 57 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 58 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 59 | * SUCH DAMAGE. |
| 60 | * |
| 61 | * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 |
| 62 | */ |
| 63 | |
| 64 | #include <sys/cdefs.h> |
| 65 | __KERNEL_RCSID(0, "$NetBSD: icmp6.c,v 1.201 2016/11/15 20:50:28 mlelstv Exp $" ); |
| 66 | |
| 67 | #ifdef _KERNEL_OPT |
| 68 | #include "opt_inet.h" |
| 69 | #include "opt_ipsec.h" |
| 70 | #endif |
| 71 | |
| 72 | #include <sys/param.h> |
| 73 | #include <sys/systm.h> |
| 74 | #include <sys/kmem.h> |
| 75 | #include <sys/mbuf.h> |
| 76 | #include <sys/protosw.h> |
| 77 | #include <sys/socket.h> |
| 78 | #include <sys/socketvar.h> |
| 79 | #include <sys/time.h> |
| 80 | #include <sys/kernel.h> |
| 81 | #include <sys/syslog.h> |
| 82 | #include <sys/domain.h> |
| 83 | #include <sys/sysctl.h> |
| 84 | |
| 85 | #include <net/if.h> |
| 86 | #include <net/route.h> |
| 87 | #include <net/if_dl.h> |
| 88 | #include <net/if_types.h> |
| 89 | |
| 90 | #include <netinet/in.h> |
| 91 | #include <netinet/in_var.h> |
| 92 | #include <netinet/ip6.h> |
| 93 | #include <netinet6/ip6_var.h> |
| 94 | #include <netinet6/ip6_private.h> |
| 95 | #include <netinet/icmp6.h> |
| 96 | #include <netinet6/icmp6_private.h> |
| 97 | #include <netinet6/mld6_var.h> |
| 98 | #include <netinet6/in6_pcb.h> |
| 99 | #include <netinet6/nd6.h> |
| 100 | #include <netinet6/in6_ifattach.h> |
| 101 | #include <netinet6/ip6protosw.h> |
| 102 | #include <netinet6/scope6_var.h> |
| 103 | |
| 104 | #ifdef IPSEC |
| 105 | #include <netipsec/ipsec.h> |
| 106 | #include <netipsec/key.h> |
| 107 | #endif |
| 108 | |
| 109 | |
| 110 | #include "faith.h" |
| 111 | #if defined(NFAITH) && 0 < NFAITH |
| 112 | #include <net/if_faith.h> |
| 113 | #endif |
| 114 | |
| 115 | #include <net/net_osdep.h> |
| 116 | |
| 117 | extern struct domain inet6domain; |
| 118 | |
| 119 | percpu_t *icmp6stat_percpu; |
| 120 | |
| 121 | extern struct inpcbtable raw6cbtable; |
| 122 | extern int icmp6errppslim; |
| 123 | static int icmp6errpps_count = 0; |
| 124 | static struct timeval icmp6errppslim_last; |
| 125 | extern int icmp6_nodeinfo; |
| 126 | |
| 127 | /* |
| 128 | * List of callbacks to notify when Path MTU changes are made. |
| 129 | */ |
| 130 | struct icmp6_mtudisc_callback { |
| 131 | LIST_ENTRY(icmp6_mtudisc_callback) mc_list; |
| 132 | void (*mc_func)(struct in6_addr *); |
| 133 | }; |
| 134 | |
| 135 | LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = |
| 136 | LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); |
| 137 | |
| 138 | static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; |
| 139 | extern int pmtu_expire; |
| 140 | |
| 141 | /* XXX do these values make any sense? */ |
| 142 | static int icmp6_mtudisc_hiwat = 1280; |
| 143 | static int icmp6_mtudisc_lowat = 256; |
| 144 | |
| 145 | /* |
| 146 | * keep track of # of redirect routes. |
| 147 | */ |
| 148 | static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; |
| 149 | |
| 150 | /* XXX experimental, turned off */ |
| 151 | static int icmp6_redirect_hiwat = -1; |
| 152 | static int icmp6_redirect_lowat = -1; |
| 153 | |
| 154 | static void icmp6_errcount(u_int, int, int); |
| 155 | static int icmp6_rip6_input(struct mbuf **, int); |
| 156 | static int icmp6_ratelimit(const struct in6_addr *, const int, const int); |
| 157 | static const char *icmp6_redirect_diag(struct in6_addr *, |
| 158 | struct in6_addr *, struct in6_addr *); |
| 159 | static struct mbuf *ni6_input(struct mbuf *, int); |
| 160 | static struct mbuf *ni6_nametodns(const char *, int, int); |
| 161 | static int ni6_dnsmatch(const char *, int, const char *, int); |
| 162 | static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *, |
| 163 | struct ifnet **, char *, struct psref *); |
| 164 | static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, |
| 165 | struct ifnet *, int); |
| 166 | static int icmp6_notify_error(struct mbuf *, int, int, int); |
| 167 | static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); |
| 168 | static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); |
| 169 | static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); |
| 170 | static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); |
| 171 | |
| 172 | |
| 173 | void |
| 174 | icmp6_init(void) |
| 175 | { |
| 176 | |
| 177 | sysctl_net_inet6_icmp6_setup(NULL); |
| 178 | mld_init(); |
| 179 | icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); |
| 180 | icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); |
| 181 | |
| 182 | icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS); |
| 183 | } |
| 184 | |
| 185 | static void |
| 186 | icmp6_errcount(u_int base, int type, int code) |
| 187 | { |
| 188 | switch (type) { |
| 189 | case ICMP6_DST_UNREACH: |
| 190 | switch (code) { |
| 191 | case ICMP6_DST_UNREACH_NOROUTE: |
| 192 | ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE); |
| 193 | return; |
| 194 | case ICMP6_DST_UNREACH_ADMIN: |
| 195 | ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN); |
| 196 | return; |
| 197 | case ICMP6_DST_UNREACH_BEYONDSCOPE: |
| 198 | ICMP6_STATINC(base + |
| 199 | ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE); |
| 200 | return; |
| 201 | case ICMP6_DST_UNREACH_ADDR: |
| 202 | ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR); |
| 203 | return; |
| 204 | case ICMP6_DST_UNREACH_NOPORT: |
| 205 | ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT); |
| 206 | return; |
| 207 | } |
| 208 | break; |
| 209 | case ICMP6_PACKET_TOO_BIG: |
| 210 | ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG); |
| 211 | return; |
| 212 | case ICMP6_TIME_EXCEEDED: |
| 213 | switch (code) { |
| 214 | case ICMP6_TIME_EXCEED_TRANSIT: |
| 215 | ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT); |
| 216 | return; |
| 217 | case ICMP6_TIME_EXCEED_REASSEMBLY: |
| 218 | ICMP6_STATINC(base + |
| 219 | ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY); |
| 220 | return; |
| 221 | } |
| 222 | break; |
| 223 | case ICMP6_PARAM_PROB: |
| 224 | switch (code) { |
| 225 | case ICMP6_PARAMPROB_HEADER: |
| 226 | ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER); |
| 227 | return; |
| 228 | case ICMP6_PARAMPROB_NEXTHEADER: |
| 229 | ICMP6_STATINC(base + |
| 230 | ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER); |
| 231 | return; |
| 232 | case ICMP6_PARAMPROB_OPTION: |
| 233 | ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION); |
| 234 | return; |
| 235 | } |
| 236 | break; |
| 237 | case ND_REDIRECT: |
| 238 | ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT); |
| 239 | return; |
| 240 | } |
| 241 | ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN); |
| 242 | } |
| 243 | |
| 244 | /* |
| 245 | * Register a Path MTU Discovery callback. |
| 246 | */ |
| 247 | void |
| 248 | icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *)) |
| 249 | { |
| 250 | struct icmp6_mtudisc_callback *mc; |
| 251 | |
| 252 | for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; |
| 253 | mc = LIST_NEXT(mc, mc_list)) { |
| 254 | if (mc->mc_func == func) |
| 255 | return; |
| 256 | } |
| 257 | |
| 258 | mc = kmem_alloc(sizeof(*mc), KM_SLEEP); |
| 259 | mc->mc_func = func; |
| 260 | LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, mc, mc_list); |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * A wrapper function for icmp6_error() necessary when the erroneous packet |
| 265 | * may not contain enough scope zone information. |
| 266 | */ |
| 267 | void |
| 268 | icmp6_error2(struct mbuf *m, int type, int code, int param, |
| 269 | struct ifnet *ifp) |
| 270 | { |
| 271 | struct ip6_hdr *ip6; |
| 272 | |
| 273 | if (ifp == NULL) |
| 274 | return; |
| 275 | |
| 276 | if (m->m_len < sizeof(struct ip6_hdr)) { |
| 277 | m = m_pullup(m, sizeof(struct ip6_hdr)); |
| 278 | if (m == NULL) |
| 279 | return; |
| 280 | } |
| 281 | |
| 282 | ip6 = mtod(m, struct ip6_hdr *); |
| 283 | |
| 284 | if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) |
| 285 | return; |
| 286 | if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) |
| 287 | return; |
| 288 | |
| 289 | icmp6_error(m, type, code, param); |
| 290 | } |
| 291 | |
| 292 | /* |
| 293 | * Generate an error packet of type error in response to bad IP6 packet. |
| 294 | */ |
| 295 | void |
| 296 | icmp6_error(struct mbuf *m, int type, int code, int param) |
| 297 | { |
| 298 | struct ip6_hdr *oip6, *nip6; |
| 299 | struct icmp6_hdr *icmp6; |
| 300 | u_int preplen; |
| 301 | int off; |
| 302 | int nxt; |
| 303 | |
| 304 | ICMP6_STATINC(ICMP6_STAT_ERROR); |
| 305 | |
| 306 | /* count per-type-code statistics */ |
| 307 | icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); |
| 308 | |
| 309 | if (m->m_flags & M_DECRYPTED) { |
| 310 | ICMP6_STATINC(ICMP6_STAT_CANTERROR); |
| 311 | goto freeit; |
| 312 | } |
| 313 | |
| 314 | if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && |
| 315 | (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) |
| 316 | return; |
| 317 | oip6 = mtod(m, struct ip6_hdr *); |
| 318 | |
| 319 | /* |
| 320 | * If the destination address of the erroneous packet is a multicast |
| 321 | * address, or the packet was sent using link-layer multicast, |
| 322 | * we should basically suppress sending an error (RFC 2463, Section |
| 323 | * 2.4). |
| 324 | * We have two exceptions (the item e.2 in that section): |
| 325 | * - the Pakcet Too Big message can be sent for path MTU discovery. |
| 326 | * - the Parameter Problem Message that can be allowed an icmp6 error |
| 327 | * in the option type field. This check has been done in |
| 328 | * ip6_unknown_opt(), so we can just check the type and code. |
| 329 | */ |
| 330 | if ((m->m_flags & (M_BCAST|M_MCAST) || |
| 331 | IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && |
| 332 | (type != ICMP6_PACKET_TOO_BIG && |
| 333 | (type != ICMP6_PARAM_PROB || |
| 334 | code != ICMP6_PARAMPROB_OPTION))) |
| 335 | goto freeit; |
| 336 | |
| 337 | /* |
| 338 | * RFC 2463, 2.4 (e.5): source address check. |
| 339 | * XXX: the case of anycast source? |
| 340 | */ |
| 341 | if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || |
| 342 | IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) |
| 343 | goto freeit; |
| 344 | |
| 345 | /* |
| 346 | * If we are about to send ICMPv6 against ICMPv6 error/redirect, |
| 347 | * don't do it. |
| 348 | */ |
| 349 | nxt = -1; |
| 350 | off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); |
| 351 | if (off >= 0 && nxt == IPPROTO_ICMPV6) { |
| 352 | struct icmp6_hdr *icp; |
| 353 | |
| 354 | IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, |
| 355 | sizeof(*icp)); |
| 356 | if (icp == NULL) { |
| 357 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 358 | return; |
| 359 | } |
| 360 | if (icp->icmp6_type < ICMP6_ECHO_REQUEST || |
| 361 | icp->icmp6_type == ND_REDIRECT) { |
| 362 | /* |
| 363 | * ICMPv6 error |
| 364 | * Special case: for redirect (which is |
| 365 | * informational) we must not send icmp6 error. |
| 366 | */ |
| 367 | ICMP6_STATINC(ICMP6_STAT_CANTERROR); |
| 368 | goto freeit; |
| 369 | } else { |
| 370 | /* ICMPv6 informational - send the error */ |
| 371 | } |
| 372 | } |
| 373 | #if 0 /* controversial */ |
| 374 | else if (off >= 0 && nxt == IPPROTO_ESP) { |
| 375 | /* |
| 376 | * It could be ICMPv6 error inside ESP. Take a safer side, |
| 377 | * don't respond. |
| 378 | */ |
| 379 | ICMP6_STATINC(ICMP6_STAT_CANTERROR); |
| 380 | goto freeit; |
| 381 | } |
| 382 | #endif |
| 383 | else { |
| 384 | /* non-ICMPv6 - send the error */ |
| 385 | } |
| 386 | |
| 387 | oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ |
| 388 | |
| 389 | /* Finally, do rate limitation check. */ |
| 390 | if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { |
| 391 | ICMP6_STATINC(ICMP6_STAT_TOOFREQ); |
| 392 | goto freeit; |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * OK, ICMP6 can be generated. |
| 397 | */ |
| 398 | |
| 399 | if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) |
| 400 | m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); |
| 401 | |
| 402 | preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); |
| 403 | M_PREPEND(m, preplen, M_DONTWAIT); |
| 404 | if (m && M_UNWRITABLE(m, preplen)) |
| 405 | m = m_pullup(m, preplen); |
| 406 | if (m == NULL) { |
| 407 | nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n" , __LINE__); |
| 408 | return; |
| 409 | } |
| 410 | |
| 411 | nip6 = mtod(m, struct ip6_hdr *); |
| 412 | nip6->ip6_src = oip6->ip6_src; |
| 413 | nip6->ip6_dst = oip6->ip6_dst; |
| 414 | |
| 415 | in6_clearscope(&oip6->ip6_src); |
| 416 | in6_clearscope(&oip6->ip6_dst); |
| 417 | |
| 418 | icmp6 = (struct icmp6_hdr *)(nip6 + 1); |
| 419 | icmp6->icmp6_type = type; |
| 420 | icmp6->icmp6_code = code; |
| 421 | icmp6->icmp6_pptr = htonl((u_int32_t)param); |
| 422 | |
| 423 | /* |
| 424 | * icmp6_reflect() is designed to be in the input path. |
| 425 | * icmp6_error() can be called from both input and output path, |
| 426 | * and if we are in output path rcvif could contain bogus value. |
| 427 | * clear m->m_pkthdr.rcvif for safety, we should have enough scope |
| 428 | * information in ip header (nip6). |
| 429 | */ |
| 430 | m_reset_rcvif(m); |
| 431 | |
| 432 | ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); |
| 433 | icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ |
| 434 | |
| 435 | return; |
| 436 | |
| 437 | freeit: |
| 438 | /* |
| 439 | * If we can't tell whether or not we can generate ICMP6, free it. |
| 440 | */ |
| 441 | m_freem(m); |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * Process a received ICMP6 message. |
| 446 | */ |
| 447 | int |
| 448 | icmp6_input(struct mbuf **mp, int *offp, int proto) |
| 449 | { |
| 450 | struct mbuf *m = *mp, *n; |
| 451 | struct ip6_hdr *ip6, *nip6; |
| 452 | struct icmp6_hdr *icmp6, *nicmp6; |
| 453 | int off = *offp; |
| 454 | int icmp6len = m->m_pkthdr.len - *offp; |
| 455 | int code, sum, noff; |
| 456 | struct ifnet *rcvif; |
| 457 | struct psref psref; |
| 458 | |
| 459 | rcvif = m_get_rcvif_psref(m, &psref); |
| 460 | if (__predict_false(rcvif == NULL)) |
| 461 | goto freeit; |
| 462 | |
| 463 | #define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) |
| 464 | KASSERT(ICMP6_MAXLEN < MCLBYTES); |
| 465 | icmp6_ifstat_inc(rcvif, ifs6_in_msg); |
| 466 | |
| 467 | /* |
| 468 | * Locate icmp6 structure in mbuf, and check |
| 469 | * that not corrupted and of at least minimum length |
| 470 | */ |
| 471 | |
| 472 | if (icmp6len < sizeof(struct icmp6_hdr)) { |
| 473 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 474 | icmp6_ifstat_inc(rcvif, ifs6_in_error); |
| 475 | goto freeit; |
| 476 | } |
| 477 | |
| 478 | ip6 = mtod(m, struct ip6_hdr *); |
| 479 | IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); |
| 480 | if (icmp6 == NULL) { |
| 481 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 482 | icmp6_ifstat_inc(rcvif, ifs6_in_error); |
| 483 | goto freeit; |
| 484 | } |
| 485 | /* |
| 486 | * Enforce alignment requirements that are violated in |
| 487 | * some cases, see kern/50766 for details. |
| 488 | */ |
| 489 | if (IP6_HDR_ALIGNED_P(icmp6) == 0) { |
| 490 | m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0); |
| 491 | if (m == NULL) { |
| 492 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 493 | icmp6_ifstat_inc(rcvif, ifs6_in_error); |
| 494 | goto freeit; |
| 495 | } |
| 496 | ip6 = mtod(m, struct ip6_hdr *); |
| 497 | icmp6 = (struct icmp6_hdr *)(ip6 + 1); |
| 498 | } |
| 499 | KASSERT(IP6_HDR_ALIGNED_P(icmp6)); |
| 500 | |
| 501 | /* |
| 502 | * calculate the checksum |
| 503 | */ |
| 504 | if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { |
| 505 | nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n" , |
| 506 | icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)); |
| 507 | ICMP6_STATINC(ICMP6_STAT_CHECKSUM); |
| 508 | icmp6_ifstat_inc(rcvif, ifs6_in_error); |
| 509 | goto freeit; |
| 510 | } |
| 511 | |
| 512 | #if defined(NFAITH) && 0 < NFAITH |
| 513 | if (faithprefix(&ip6->ip6_dst)) { |
| 514 | /* |
| 515 | * Deliver very specific ICMP6 type only. |
| 516 | * This is important to deliver TOOBIG. Otherwise PMTUD |
| 517 | * will not work. |
| 518 | */ |
| 519 | switch (icmp6->icmp6_type) { |
| 520 | case ICMP6_DST_UNREACH: |
| 521 | case ICMP6_PACKET_TOO_BIG: |
| 522 | case ICMP6_TIME_EXCEEDED: |
| 523 | break; |
| 524 | default: |
| 525 | goto freeit; |
| 526 | } |
| 527 | } |
| 528 | #endif |
| 529 | |
| 530 | code = icmp6->icmp6_code; |
| 531 | ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); |
| 532 | |
| 533 | switch (icmp6->icmp6_type) { |
| 534 | case ICMP6_DST_UNREACH: |
| 535 | icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); |
| 536 | switch (code) { |
| 537 | case ICMP6_DST_UNREACH_NOROUTE: |
| 538 | code = PRC_UNREACH_NET; |
| 539 | break; |
| 540 | case ICMP6_DST_UNREACH_ADMIN: |
| 541 | icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); |
| 542 | code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ |
| 543 | break; |
| 544 | case ICMP6_DST_UNREACH_ADDR: |
| 545 | code = PRC_HOSTDEAD; |
| 546 | break; |
| 547 | #ifdef COMPAT_RFC1885 |
| 548 | case ICMP6_DST_UNREACH_NOTNEIGHBOR: |
| 549 | code = PRC_UNREACH_SRCFAIL; |
| 550 | break; |
| 551 | #else |
| 552 | case ICMP6_DST_UNREACH_BEYONDSCOPE: |
| 553 | /* I mean "source address was incorrect." */ |
| 554 | code = PRC_UNREACH_NET; |
| 555 | break; |
| 556 | #endif |
| 557 | case ICMP6_DST_UNREACH_NOPORT: |
| 558 | code = PRC_UNREACH_PORT; |
| 559 | break; |
| 560 | default: |
| 561 | goto badcode; |
| 562 | } |
| 563 | goto deliver; |
| 564 | |
| 565 | case ICMP6_PACKET_TOO_BIG: |
| 566 | icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); |
| 567 | |
| 568 | /* |
| 569 | * MTU is checked in icmp6_mtudisc. |
| 570 | */ |
| 571 | code = PRC_MSGSIZE; |
| 572 | |
| 573 | /* |
| 574 | * Updating the path MTU will be done after examining |
| 575 | * intermediate extension headers. |
| 576 | */ |
| 577 | goto deliver; |
| 578 | |
| 579 | case ICMP6_TIME_EXCEEDED: |
| 580 | icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); |
| 581 | switch (code) { |
| 582 | case ICMP6_TIME_EXCEED_TRANSIT: |
| 583 | code = PRC_TIMXCEED_INTRANS; |
| 584 | break; |
| 585 | case ICMP6_TIME_EXCEED_REASSEMBLY: |
| 586 | code = PRC_TIMXCEED_REASS; |
| 587 | break; |
| 588 | default: |
| 589 | goto badcode; |
| 590 | } |
| 591 | goto deliver; |
| 592 | |
| 593 | case ICMP6_PARAM_PROB: |
| 594 | icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); |
| 595 | switch (code) { |
| 596 | case ICMP6_PARAMPROB_NEXTHEADER: |
| 597 | code = PRC_UNREACH_PROTOCOL; |
| 598 | break; |
| 599 | case ICMP6_PARAMPROB_HEADER: |
| 600 | case ICMP6_PARAMPROB_OPTION: |
| 601 | code = PRC_PARAMPROB; |
| 602 | break; |
| 603 | default: |
| 604 | goto badcode; |
| 605 | } |
| 606 | goto deliver; |
| 607 | |
| 608 | case ICMP6_ECHO_REQUEST: |
| 609 | icmp6_ifstat_inc(rcvif, ifs6_in_echo); |
| 610 | if (code != 0) |
| 611 | goto badcode; |
| 612 | /* |
| 613 | * Copy mbuf to send to two data paths: userland socket(s), |
| 614 | * and to the querier (echo reply). |
| 615 | * m: a copy for socket, n: a copy for querier |
| 616 | * |
| 617 | * If the first mbuf is shared, or the first mbuf is too short, |
| 618 | * copy the first part of the data into a fresh mbuf. |
| 619 | * Otherwise, we will wrongly overwrite both copies. |
| 620 | */ |
| 621 | if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { |
| 622 | /* Give up local */ |
| 623 | n = m; |
| 624 | m = NULL; |
| 625 | } else if (M_READONLY(n) || |
| 626 | n->m_len < off + sizeof(struct icmp6_hdr)) { |
| 627 | struct mbuf *n0 = n; |
| 628 | |
| 629 | /* |
| 630 | * Prepare an internal mbuf. m_pullup() doesn't |
| 631 | * always copy the length we specified. |
| 632 | */ |
| 633 | if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { |
| 634 | /* Give up local */ |
| 635 | n = m; |
| 636 | m = NULL; |
| 637 | } |
| 638 | m_freem(n0); |
| 639 | } |
| 640 | IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, |
| 641 | sizeof(*nicmp6)); |
| 642 | if (nicmp6 == NULL) |
| 643 | goto freeit; |
| 644 | nicmp6->icmp6_type = ICMP6_ECHO_REPLY; |
| 645 | nicmp6->icmp6_code = 0; |
| 646 | if (n) { |
| 647 | uint64_t *icmp6s = ICMP6_STAT_GETREF(); |
| 648 | icmp6s[ICMP6_STAT_REFLECT]++; |
| 649 | icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; |
| 650 | ICMP6_STAT_PUTREF(); |
| 651 | icmp6_reflect(n, off); |
| 652 | } |
| 653 | if (!m) |
| 654 | goto freeit; |
| 655 | break; |
| 656 | |
| 657 | case ICMP6_ECHO_REPLY: |
| 658 | icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); |
| 659 | if (code != 0) |
| 660 | goto badcode; |
| 661 | break; |
| 662 | |
| 663 | case MLD_LISTENER_QUERY: |
| 664 | case MLD_LISTENER_REPORT: |
| 665 | if (icmp6len < sizeof(struct mld_hdr)) |
| 666 | goto badlen; |
| 667 | if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ |
| 668 | icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); |
| 669 | else |
| 670 | icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); |
| 671 | if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { |
| 672 | /* give up local */ |
| 673 | mld_input(m, off); |
| 674 | m = NULL; |
| 675 | goto freeit; |
| 676 | } |
| 677 | mld_input(n, off); |
| 678 | /* m stays. */ |
| 679 | break; |
| 680 | |
| 681 | case MLD_LISTENER_DONE: |
| 682 | icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); |
| 683 | if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ |
| 684 | goto badlen; |
| 685 | break; /* nothing to be done in kernel */ |
| 686 | |
| 687 | case MLD_MTRACE_RESP: |
| 688 | case MLD_MTRACE: |
| 689 | /* XXX: these two are experimental. not officially defined. */ |
| 690 | /* XXX: per-interface statistics? */ |
| 691 | break; /* just pass it to applications */ |
| 692 | |
| 693 | case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ |
| 694 | { |
| 695 | enum { WRU, FQDN } mode; |
| 696 | |
| 697 | if (!icmp6_nodeinfo) |
| 698 | break; |
| 699 | |
| 700 | if (icmp6len == sizeof(struct icmp6_hdr) + 4) |
| 701 | mode = WRU; |
| 702 | else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) |
| 703 | mode = FQDN; |
| 704 | else |
| 705 | goto badlen; |
| 706 | |
| 707 | if (mode == FQDN) { |
| 708 | n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); |
| 709 | if (n) |
| 710 | n = ni6_input(n, off); |
| 711 | /* XXX meaningless if n == NULL */ |
| 712 | noff = sizeof(struct ip6_hdr); |
| 713 | } else { |
| 714 | u_char *p; |
| 715 | int maxhlen; |
| 716 | |
| 717 | if ((icmp6_nodeinfo & 5) != 5) |
| 718 | break; |
| 719 | |
| 720 | if (code != 0) |
| 721 | goto badcode; |
| 722 | MGETHDR(n, M_DONTWAIT, m->m_type); |
| 723 | if (n && ICMP6_MAXLEN > MHLEN) { |
| 724 | MCLGET(n, M_DONTWAIT); |
| 725 | if ((n->m_flags & M_EXT) == 0) { |
| 726 | m_free(n); |
| 727 | n = NULL; |
| 728 | } |
| 729 | } |
| 730 | if (n == NULL) { |
| 731 | /* Give up remote */ |
| 732 | break; |
| 733 | } |
| 734 | m_reset_rcvif(n); |
| 735 | n->m_len = 0; |
| 736 | maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; |
| 737 | if (maxhlen < 0) |
| 738 | break; |
| 739 | if (maxhlen > hostnamelen) |
| 740 | maxhlen = hostnamelen; |
| 741 | /* |
| 742 | * Copy IPv6 and ICMPv6 only. |
| 743 | */ |
| 744 | nip6 = mtod(n, struct ip6_hdr *); |
| 745 | bcopy(ip6, nip6, sizeof(struct ip6_hdr)); |
| 746 | nicmp6 = (struct icmp6_hdr *)(nip6 + 1); |
| 747 | bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); |
| 748 | p = (u_char *)(nicmp6 + 1); |
| 749 | memset(p, 0, 4); |
| 750 | bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ |
| 751 | noff = sizeof(struct ip6_hdr); |
| 752 | M_COPY_PKTHDR(n, m); /* just for rcvif */ |
| 753 | n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + |
| 754 | sizeof(struct icmp6_hdr) + 4 + maxhlen; |
| 755 | nicmp6->icmp6_type = ICMP6_WRUREPLY; |
| 756 | nicmp6->icmp6_code = 0; |
| 757 | } |
| 758 | #undef hostnamelen |
| 759 | if (n) { |
| 760 | uint64_t *icmp6s = ICMP6_STAT_GETREF(); |
| 761 | icmp6s[ICMP6_STAT_REFLECT]++; |
| 762 | icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; |
| 763 | ICMP6_STAT_PUTREF(); |
| 764 | icmp6_reflect(n, noff); |
| 765 | } |
| 766 | break; |
| 767 | } |
| 768 | |
| 769 | case ICMP6_WRUREPLY: |
| 770 | if (code != 0) |
| 771 | goto badcode; |
| 772 | break; |
| 773 | |
| 774 | case ND_ROUTER_SOLICIT: |
| 775 | icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); |
| 776 | if (code != 0) |
| 777 | goto badcode; |
| 778 | if (icmp6len < sizeof(struct nd_router_solicit)) |
| 779 | goto badlen; |
| 780 | if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { |
| 781 | /* give up local */ |
| 782 | nd6_rs_input(m, off, icmp6len); |
| 783 | m = NULL; |
| 784 | goto freeit; |
| 785 | } |
| 786 | nd6_rs_input(n, off, icmp6len); |
| 787 | /* m stays. */ |
| 788 | break; |
| 789 | |
| 790 | case ND_ROUTER_ADVERT: |
| 791 | icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); |
| 792 | if (code != 0) |
| 793 | goto badcode; |
| 794 | if (icmp6len < sizeof(struct nd_router_advert)) |
| 795 | goto badlen; |
| 796 | if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { |
| 797 | /* give up local */ |
| 798 | nd6_ra_input(m, off, icmp6len); |
| 799 | m = NULL; |
| 800 | goto freeit; |
| 801 | } |
| 802 | nd6_ra_input(n, off, icmp6len); |
| 803 | /* m stays. */ |
| 804 | break; |
| 805 | |
| 806 | case ND_NEIGHBOR_SOLICIT: |
| 807 | icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); |
| 808 | if (code != 0) |
| 809 | goto badcode; |
| 810 | if (icmp6len < sizeof(struct nd_neighbor_solicit)) |
| 811 | goto badlen; |
| 812 | if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { |
| 813 | /* give up local */ |
| 814 | nd6_ns_input(m, off, icmp6len); |
| 815 | m = NULL; |
| 816 | goto freeit; |
| 817 | } |
| 818 | nd6_ns_input(n, off, icmp6len); |
| 819 | /* m stays. */ |
| 820 | break; |
| 821 | |
| 822 | case ND_NEIGHBOR_ADVERT: |
| 823 | icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); |
| 824 | if (code != 0) |
| 825 | goto badcode; |
| 826 | if (icmp6len < sizeof(struct nd_neighbor_advert)) |
| 827 | goto badlen; |
| 828 | if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { |
| 829 | /* give up local */ |
| 830 | nd6_na_input(m, off, icmp6len); |
| 831 | m = NULL; |
| 832 | goto freeit; |
| 833 | } |
| 834 | nd6_na_input(n, off, icmp6len); |
| 835 | /* m stays. */ |
| 836 | break; |
| 837 | |
| 838 | case ND_REDIRECT: |
| 839 | icmp6_ifstat_inc(rcvif, ifs6_in_redirect); |
| 840 | if (code != 0) |
| 841 | goto badcode; |
| 842 | if (icmp6len < sizeof(struct nd_redirect)) |
| 843 | goto badlen; |
| 844 | if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { |
| 845 | /* give up local */ |
| 846 | icmp6_redirect_input(m, off); |
| 847 | m = NULL; |
| 848 | goto freeit; |
| 849 | } |
| 850 | icmp6_redirect_input(n, off); |
| 851 | /* m stays. */ |
| 852 | break; |
| 853 | |
| 854 | case ICMP6_ROUTER_RENUMBERING: |
| 855 | if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && |
| 856 | code != ICMP6_ROUTER_RENUMBERING_RESULT) |
| 857 | goto badcode; |
| 858 | if (icmp6len < sizeof(struct icmp6_router_renum)) |
| 859 | goto badlen; |
| 860 | break; |
| 861 | |
| 862 | default: |
| 863 | nd6log(LOG_DEBUG, "unknown type %d(src=%s, dst=%s, ifid=%d)\n" , |
| 864 | icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), |
| 865 | ip6_sprintf(&ip6->ip6_dst), |
| 866 | rcvif ? rcvif->if_index : 0); |
| 867 | if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { |
| 868 | /* ICMPv6 error: MUST deliver it by spec... */ |
| 869 | code = PRC_NCMDS; |
| 870 | /* deliver */ |
| 871 | } else { |
| 872 | /* ICMPv6 informational: MUST not deliver */ |
| 873 | break; |
| 874 | } |
| 875 | deliver: |
| 876 | if (icmp6_notify_error(m, off, icmp6len, code)) { |
| 877 | /* In this case, m should've been freed. */ |
| 878 | m_put_rcvif_psref(rcvif, &psref); |
| 879 | return (IPPROTO_DONE); |
| 880 | } |
| 881 | break; |
| 882 | |
| 883 | badcode: |
| 884 | ICMP6_STATINC(ICMP6_STAT_BADCODE); |
| 885 | break; |
| 886 | |
| 887 | badlen: |
| 888 | ICMP6_STATINC(ICMP6_STAT_BADLEN); |
| 889 | break; |
| 890 | } |
| 891 | m_put_rcvif_psref(rcvif, &psref); |
| 892 | |
| 893 | /* deliver the packet to appropriate sockets */ |
| 894 | icmp6_rip6_input(&m, *offp); |
| 895 | |
| 896 | return IPPROTO_DONE; |
| 897 | |
| 898 | freeit: |
| 899 | m_put_rcvif_psref(rcvif, &psref); |
| 900 | m_freem(m); |
| 901 | return IPPROTO_DONE; |
| 902 | } |
| 903 | |
| 904 | static int |
| 905 | icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) |
| 906 | { |
| 907 | struct icmp6_hdr *icmp6; |
| 908 | struct ip6_hdr *eip6; |
| 909 | u_int32_t notifymtu; |
| 910 | struct sockaddr_in6 icmp6src, icmp6dst; |
| 911 | |
| 912 | if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { |
| 913 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 914 | goto freeit; |
| 915 | } |
| 916 | IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, |
| 917 | sizeof(*icmp6) + sizeof(struct ip6_hdr)); |
| 918 | if (icmp6 == NULL) { |
| 919 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 920 | return (-1); |
| 921 | } |
| 922 | eip6 = (struct ip6_hdr *)(icmp6 + 1); |
| 923 | |
| 924 | /* Detect the upper level protocol */ |
| 925 | { |
| 926 | void (*ctlfunc)(int, struct sockaddr *, void *); |
| 927 | u_int8_t nxt = eip6->ip6_nxt; |
| 928 | int eoff = off + sizeof(struct icmp6_hdr) + |
| 929 | sizeof(struct ip6_hdr); |
| 930 | struct ip6ctlparam ip6cp; |
| 931 | struct in6_addr *finaldst = NULL; |
| 932 | int icmp6type = icmp6->icmp6_type; |
| 933 | struct ip6_frag *fh; |
| 934 | struct ip6_rthdr *rth; |
| 935 | struct ip6_rthdr0 *rth0; |
| 936 | int rthlen; |
| 937 | struct ifnet *rcvif; |
| 938 | int s; |
| 939 | |
| 940 | while (1) { /* XXX: should avoid infinite loop explicitly? */ |
| 941 | struct ip6_ext *eh; |
| 942 | |
| 943 | switch (nxt) { |
| 944 | case IPPROTO_HOPOPTS: |
| 945 | case IPPROTO_DSTOPTS: |
| 946 | case IPPROTO_AH: |
| 947 | IP6_EXTHDR_GET(eh, struct ip6_ext *, m, |
| 948 | eoff, sizeof(*eh)); |
| 949 | if (eh == NULL) { |
| 950 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 951 | return (-1); |
| 952 | } |
| 953 | |
| 954 | if (nxt == IPPROTO_AH) |
| 955 | eoff += (eh->ip6e_len + 2) << 2; |
| 956 | else |
| 957 | eoff += (eh->ip6e_len + 1) << 3; |
| 958 | nxt = eh->ip6e_nxt; |
| 959 | break; |
| 960 | case IPPROTO_ROUTING: |
| 961 | /* |
| 962 | * When the erroneous packet contains a |
| 963 | * routing header, we should examine the |
| 964 | * header to determine the final destination. |
| 965 | * Otherwise, we can't properly update |
| 966 | * information that depends on the final |
| 967 | * destination (e.g. path MTU). |
| 968 | */ |
| 969 | IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, |
| 970 | eoff, sizeof(*rth)); |
| 971 | if (rth == NULL) { |
| 972 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 973 | return (-1); |
| 974 | } |
| 975 | rthlen = (rth->ip6r_len + 1) << 3; |
| 976 | /* |
| 977 | * XXX: currently there is no |
| 978 | * officially defined type other |
| 979 | * than type-0. |
| 980 | * Note that if the segment left field |
| 981 | * is 0, all intermediate hops must |
| 982 | * have been passed. |
| 983 | */ |
| 984 | if (rth->ip6r_segleft && |
| 985 | rth->ip6r_type == IPV6_RTHDR_TYPE_0) { |
| 986 | int hops; |
| 987 | |
| 988 | IP6_EXTHDR_GET(rth0, |
| 989 | struct ip6_rthdr0 *, m, |
| 990 | eoff, rthlen); |
| 991 | if (rth0 == NULL) { |
| 992 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 993 | return (-1); |
| 994 | } |
| 995 | /* just ignore a bogus header */ |
| 996 | if ((rth0->ip6r0_len % 2) == 0 && |
| 997 | (hops = rth0->ip6r0_len/2)) |
| 998 | finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); |
| 999 | } |
| 1000 | eoff += rthlen; |
| 1001 | nxt = rth->ip6r_nxt; |
| 1002 | break; |
| 1003 | case IPPROTO_FRAGMENT: |
| 1004 | IP6_EXTHDR_GET(fh, struct ip6_frag *, m, |
| 1005 | eoff, sizeof(*fh)); |
| 1006 | if (fh == NULL) { |
| 1007 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 1008 | return (-1); |
| 1009 | } |
| 1010 | /* |
| 1011 | * Data after a fragment header is meaningless |
| 1012 | * unless it is the first fragment, but |
| 1013 | * we'll go to the notify label for path MTU |
| 1014 | * discovery. |
| 1015 | */ |
| 1016 | if (fh->ip6f_offlg & IP6F_OFF_MASK) |
| 1017 | goto notify; |
| 1018 | |
| 1019 | eoff += sizeof(struct ip6_frag); |
| 1020 | nxt = fh->ip6f_nxt; |
| 1021 | break; |
| 1022 | default: |
| 1023 | /* |
| 1024 | * This case includes ESP and the No Next |
| 1025 | * Header. In such cases going to the notify |
| 1026 | * label does not have any meaning |
| 1027 | * (i.e. ctlfunc will be NULL), but we go |
| 1028 | * anyway since we might have to update |
| 1029 | * path MTU information. |
| 1030 | */ |
| 1031 | goto notify; |
| 1032 | } |
| 1033 | } |
| 1034 | notify: |
| 1035 | IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, |
| 1036 | sizeof(*icmp6) + sizeof(struct ip6_hdr)); |
| 1037 | if (icmp6 == NULL) { |
| 1038 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 1039 | return (-1); |
| 1040 | } |
| 1041 | |
| 1042 | /* |
| 1043 | * retrieve parameters from the inner IPv6 header, and convert |
| 1044 | * them into sockaddr structures. |
| 1045 | * XXX: there is no guarantee that the source or destination |
| 1046 | * addresses of the inner packet are in the same scope zone as |
| 1047 | * the addresses of the icmp packet. But there is no other |
| 1048 | * way to determine the zone. |
| 1049 | */ |
| 1050 | eip6 = (struct ip6_hdr *)(icmp6 + 1); |
| 1051 | |
| 1052 | rcvif = m_get_rcvif(m, &s); |
| 1053 | sockaddr_in6_init(&icmp6dst, |
| 1054 | (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); |
| 1055 | if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { |
| 1056 | m_put_rcvif(rcvif, &s); |
| 1057 | goto freeit; |
| 1058 | } |
| 1059 | sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); |
| 1060 | if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { |
| 1061 | m_put_rcvif(rcvif, &s); |
| 1062 | goto freeit; |
| 1063 | } |
| 1064 | m_put_rcvif(rcvif, &s); |
| 1065 | |
| 1066 | icmp6src.sin6_flowinfo = |
| 1067 | (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); |
| 1068 | |
| 1069 | if (finaldst == NULL) |
| 1070 | finaldst = &eip6->ip6_dst; |
| 1071 | ip6cp.ip6c_m = m; |
| 1072 | ip6cp.ip6c_icmp6 = icmp6; |
| 1073 | ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); |
| 1074 | ip6cp.ip6c_off = eoff; |
| 1075 | ip6cp.ip6c_finaldst = finaldst; |
| 1076 | ip6cp.ip6c_src = &icmp6src; |
| 1077 | ip6cp.ip6c_nxt = nxt; |
| 1078 | |
| 1079 | if (icmp6type == ICMP6_PACKET_TOO_BIG) { |
| 1080 | notifymtu = ntohl(icmp6->icmp6_mtu); |
| 1081 | ip6cp.ip6c_cmdarg = (void *)¬ifymtu; |
| 1082 | } |
| 1083 | |
| 1084 | ctlfunc = (void (*)(int, struct sockaddr *, void *)) |
| 1085 | (inet6sw[ip6_protox[nxt]].pr_ctlinput); |
| 1086 | if (ctlfunc) { |
| 1087 | (void) (*ctlfunc)(code, sin6tosa(&icmp6dst), |
| 1088 | &ip6cp); |
| 1089 | } |
| 1090 | } |
| 1091 | return (0); |
| 1092 | |
| 1093 | freeit: |
| 1094 | m_freem(m); |
| 1095 | return (-1); |
| 1096 | } |
| 1097 | |
| 1098 | void |
| 1099 | icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) |
| 1100 | { |
| 1101 | unsigned long rtcount; |
| 1102 | struct icmp6_mtudisc_callback *mc; |
| 1103 | struct in6_addr *dst = ip6cp->ip6c_finaldst; |
| 1104 | struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; |
| 1105 | struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ |
| 1106 | u_int mtu = ntohl(icmp6->icmp6_mtu); |
| 1107 | struct rtentry *rt = NULL; |
| 1108 | struct sockaddr_in6 sin6; |
| 1109 | struct ifnet *rcvif; |
| 1110 | int s; |
| 1111 | |
| 1112 | /* |
| 1113 | * The MTU should not be less than the minimal IPv6 MTU except for the |
| 1114 | * hack in ip6_output/ip6_setpmtu where we always include a frag header. |
| 1115 | * In that one case, the MTU might be less than 1280. |
| 1116 | */ |
| 1117 | if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { |
| 1118 | /* is the mtu even sane? */ |
| 1119 | if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) |
| 1120 | return; |
| 1121 | if (!validated) |
| 1122 | return; |
| 1123 | mtu = IPV6_MMTU - sizeof(struct ip6_frag); |
| 1124 | } |
| 1125 | |
| 1126 | /* |
| 1127 | * allow non-validated cases if memory is plenty, to make traffic |
| 1128 | * from non-connected pcb happy. |
| 1129 | */ |
| 1130 | rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); |
| 1131 | if (validated) { |
| 1132 | if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) |
| 1133 | return; |
| 1134 | else if (0 <= icmp6_mtudisc_lowat && |
| 1135 | rtcount > icmp6_mtudisc_lowat) { |
| 1136 | /* |
| 1137 | * XXX nuke a victim, install the new one. |
| 1138 | */ |
| 1139 | } |
| 1140 | } else { |
| 1141 | if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) |
| 1142 | return; |
| 1143 | } |
| 1144 | |
| 1145 | memset(&sin6, 0, sizeof(sin6)); |
| 1146 | sin6.sin6_family = PF_INET6; |
| 1147 | sin6.sin6_len = sizeof(struct sockaddr_in6); |
| 1148 | sin6.sin6_addr = *dst; |
| 1149 | rcvif = m_get_rcvif(m, &s); |
| 1150 | if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { |
| 1151 | m_put_rcvif(rcvif, &s); |
| 1152 | return; |
| 1153 | } |
| 1154 | m_put_rcvif(rcvif, &s); |
| 1155 | |
| 1156 | rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); |
| 1157 | |
| 1158 | if (rt && (rt->rt_flags & RTF_HOST) && |
| 1159 | !(rt->rt_rmx.rmx_locks & RTV_MTU) && |
| 1160 | (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { |
| 1161 | if (mtu < IN6_LINKMTU(rt->rt_ifp)) { |
| 1162 | ICMP6_STATINC(ICMP6_STAT_PMTUCHG); |
| 1163 | rt->rt_rmx.rmx_mtu = mtu; |
| 1164 | } |
| 1165 | } |
| 1166 | if (rt) { |
| 1167 | rtfree(rt); |
| 1168 | } |
| 1169 | |
| 1170 | /* |
| 1171 | * Notify protocols that the MTU for this destination |
| 1172 | * has changed. |
| 1173 | */ |
| 1174 | for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; |
| 1175 | mc = LIST_NEXT(mc, mc_list)) |
| 1176 | (*mc->mc_func)(&sin6.sin6_addr); |
| 1177 | } |
| 1178 | |
| 1179 | /* |
| 1180 | * Process a Node Information Query packet, based on |
| 1181 | * draft-ietf-ipngwg-icmp-name-lookups-07. |
| 1182 | * |
| 1183 | * Spec incompatibilities: |
| 1184 | * - IPv6 Subject address handling |
| 1185 | * - IPv4 Subject address handling support missing |
| 1186 | * - Proxy reply (answer even if it's not for me) |
| 1187 | * - joins NI group address at in6_ifattach() time only, does not cope |
| 1188 | * with hostname changes by sethostname(3) |
| 1189 | */ |
| 1190 | static struct mbuf * |
| 1191 | ni6_input(struct mbuf *m, int off) |
| 1192 | { |
| 1193 | struct icmp6_nodeinfo *ni6, *nni6; |
| 1194 | struct mbuf *n = NULL; |
| 1195 | u_int16_t qtype; |
| 1196 | int subjlen; |
| 1197 | int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); |
| 1198 | struct ni_reply_fqdn *fqdn; |
| 1199 | int addrs; /* for NI_QTYPE_NODEADDR */ |
| 1200 | struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ |
| 1201 | struct sockaddr_in6 sin6; /* ip6_dst */ |
| 1202 | struct in6_addr in6_subj; /* subject address */ |
| 1203 | struct ip6_hdr *ip6; |
| 1204 | int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ |
| 1205 | char *subj = NULL; |
| 1206 | struct ifnet *rcvif; |
| 1207 | int s, ss; |
| 1208 | struct ifaddr *ifa; |
| 1209 | struct psref psref; |
| 1210 | |
| 1211 | ip6 = mtod(m, struct ip6_hdr *); |
| 1212 | IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); |
| 1213 | if (ni6 == NULL) { |
| 1214 | /* m is already reclaimed */ |
| 1215 | return NULL; |
| 1216 | } |
| 1217 | |
| 1218 | /* |
| 1219 | * Validate IPv6 destination address. |
| 1220 | * |
| 1221 | * The Responder must discard the Query without further processing |
| 1222 | * unless it is one of the Responder's unicast or anycast addresses, or |
| 1223 | * a link-local scope multicast address which the Responder has joined. |
| 1224 | * [icmp-name-lookups-07, Section 4.] |
| 1225 | */ |
| 1226 | sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); |
| 1227 | /* XXX scopeid */ |
| 1228 | ss = pserialize_read_enter(); |
| 1229 | ifa = ifa_ifwithaddr(sin6tosa(&sin6)); |
| 1230 | if (ifa != NULL) |
| 1231 | ; /* unicast/anycast, fine */ |
| 1232 | else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) |
| 1233 | ; /* link-local multicast, fine */ |
| 1234 | else { |
| 1235 | pserialize_read_exit(ss); |
| 1236 | goto bad; |
| 1237 | } |
| 1238 | pserialize_read_exit(ss); |
| 1239 | |
| 1240 | /* validate query Subject field. */ |
| 1241 | qtype = ntohs(ni6->ni_qtype); |
| 1242 | subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); |
| 1243 | switch (qtype) { |
| 1244 | case NI_QTYPE_NOOP: |
| 1245 | case NI_QTYPE_SUPTYPES: |
| 1246 | /* 07 draft */ |
| 1247 | if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) |
| 1248 | break; |
| 1249 | /* FALLTHROUGH */ |
| 1250 | case NI_QTYPE_FQDN: |
| 1251 | case NI_QTYPE_NODEADDR: |
| 1252 | case NI_QTYPE_IPV4ADDR: |
| 1253 | switch (ni6->ni_code) { |
| 1254 | case ICMP6_NI_SUBJ_IPV6: |
| 1255 | #if ICMP6_NI_SUBJ_IPV6 != 0 |
| 1256 | case 0: |
| 1257 | #endif |
| 1258 | /* |
| 1259 | * backward compatibility - try to accept 03 draft |
| 1260 | * format, where no Subject is present. |
| 1261 | */ |
| 1262 | if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && |
| 1263 | subjlen == 0) { |
| 1264 | oldfqdn++; |
| 1265 | break; |
| 1266 | } |
| 1267 | #if ICMP6_NI_SUBJ_IPV6 != 0 |
| 1268 | if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) |
| 1269 | goto bad; |
| 1270 | #endif |
| 1271 | |
| 1272 | if (subjlen != sizeof(sin6.sin6_addr)) |
| 1273 | goto bad; |
| 1274 | |
| 1275 | /* |
| 1276 | * Validate Subject address. |
| 1277 | * |
| 1278 | * Not sure what exactly "address belongs to the node" |
| 1279 | * means in the spec, is it just unicast, or what? |
| 1280 | * |
| 1281 | * At this moment we consider Subject address as |
| 1282 | * "belong to the node" if the Subject address equals |
| 1283 | * to the IPv6 destination address; validation for |
| 1284 | * IPv6 destination address should have done enough |
| 1285 | * check for us. |
| 1286 | * |
| 1287 | * We do not do proxy at this moment. |
| 1288 | */ |
| 1289 | /* m_pulldown instead of copy? */ |
| 1290 | m_copydata(m, off + sizeof(struct icmp6_nodeinfo), |
| 1291 | subjlen, (void *)&in6_subj); |
| 1292 | rcvif = m_get_rcvif(m, &s); |
| 1293 | if (in6_setscope(&in6_subj, rcvif, NULL)) { |
| 1294 | m_put_rcvif(rcvif, &s); |
| 1295 | goto bad; |
| 1296 | } |
| 1297 | m_put_rcvif(rcvif, &s); |
| 1298 | |
| 1299 | subj = (char *)&in6_subj; |
| 1300 | if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) |
| 1301 | break; |
| 1302 | |
| 1303 | /* |
| 1304 | * XXX if we are to allow other cases, we should really |
| 1305 | * be careful about scope here. |
| 1306 | * basically, we should disallow queries toward IPv6 |
| 1307 | * destination X with subject Y, 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 | case NI_QTYPE_IPV4ADDR: |
| 1355 | if ((icmp6_nodeinfo & 2) == 0) |
| 1356 | goto bad; |
| 1357 | break; |
| 1358 | } |
| 1359 | |
| 1360 | /* guess reply length */ |
| 1361 | switch (qtype) { |
| 1362 | case NI_QTYPE_NOOP: |
| 1363 | break; /* no reply data */ |
| 1364 | case NI_QTYPE_SUPTYPES: |
| 1365 | replylen += sizeof(u_int32_t); |
| 1366 | break; |
| 1367 | case NI_QTYPE_FQDN: |
| 1368 | /* XXX will append an mbuf */ |
| 1369 | replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); |
| 1370 | break; |
| 1371 | case NI_QTYPE_NODEADDR: |
| 1372 | addrs = ni6_addrs(ni6, m, &ifp, subj, &psref); |
| 1373 | if ((replylen += addrs * (sizeof(struct in6_addr) + |
| 1374 | sizeof(u_int32_t))) > MCLBYTES) |
| 1375 | replylen = MCLBYTES; /* XXX: will truncate pkt later */ |
| 1376 | break; |
| 1377 | case NI_QTYPE_IPV4ADDR: |
| 1378 | /* unsupported - should respond with unknown Qtype? */ |
| 1379 | goto bad; |
| 1380 | default: |
| 1381 | /* |
| 1382 | * XXX: We must return a reply with the ICMP6 code |
| 1383 | * `unknown Qtype' in this case. However we regard the case |
| 1384 | * as an FQDN query for backward compatibility. |
| 1385 | * Older versions set a random value to this field, |
| 1386 | * so it rarely varies in the defined qtypes. |
| 1387 | * But the mechanism is not reliable... |
| 1388 | * maybe we should obsolete older versions. |
| 1389 | */ |
| 1390 | qtype = NI_QTYPE_FQDN; |
| 1391 | /* XXX will append an mbuf */ |
| 1392 | replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); |
| 1393 | oldfqdn++; |
| 1394 | break; |
| 1395 | } |
| 1396 | |
| 1397 | /* allocate an mbuf to reply. */ |
| 1398 | MGETHDR(n, M_DONTWAIT, m->m_type); |
| 1399 | if (n == NULL) { |
| 1400 | if_put(ifp, &psref); |
| 1401 | m_freem(m); |
| 1402 | return (NULL); |
| 1403 | } |
| 1404 | M_MOVE_PKTHDR(n, m); /* just for rcvif */ |
| 1405 | if (replylen > MHLEN) { |
| 1406 | if (replylen > MCLBYTES) { |
| 1407 | /* |
| 1408 | * XXX: should we try to allocate more? But MCLBYTES |
| 1409 | * is probably much larger than IPV6_MMTU... |
| 1410 | */ |
| 1411 | goto bad; |
| 1412 | } |
| 1413 | MCLGET(n, M_DONTWAIT); |
| 1414 | if ((n->m_flags & M_EXT) == 0) { |
| 1415 | goto bad; |
| 1416 | } |
| 1417 | } |
| 1418 | n->m_pkthdr.len = n->m_len = replylen; |
| 1419 | |
| 1420 | /* copy mbuf header and IPv6 + Node Information base headers */ |
| 1421 | bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); |
| 1422 | nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); |
| 1423 | bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); |
| 1424 | |
| 1425 | /* qtype dependent procedure */ |
| 1426 | switch (qtype) { |
| 1427 | case NI_QTYPE_NOOP: |
| 1428 | nni6->ni_code = ICMP6_NI_SUCCESS; |
| 1429 | nni6->ni_flags = 0; |
| 1430 | break; |
| 1431 | case NI_QTYPE_SUPTYPES: |
| 1432 | { |
| 1433 | u_int32_t v; |
| 1434 | nni6->ni_code = ICMP6_NI_SUCCESS; |
| 1435 | nni6->ni_flags = htons(0x0000); /* raw bitmap */ |
| 1436 | /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ |
| 1437 | v = (u_int32_t)htonl(0x0000000f); |
| 1438 | bcopy(&v, nni6 + 1, sizeof(u_int32_t)); |
| 1439 | break; |
| 1440 | } |
| 1441 | case NI_QTYPE_FQDN: |
| 1442 | nni6->ni_code = ICMP6_NI_SUCCESS; |
| 1443 | fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + |
| 1444 | sizeof(struct ip6_hdr) + |
| 1445 | sizeof(struct icmp6_nodeinfo)); |
| 1446 | nni6->ni_flags = 0; /* XXX: meaningless TTL */ |
| 1447 | fqdn->ni_fqdn_ttl = 0; /* ditto. */ |
| 1448 | /* |
| 1449 | * XXX do we really have FQDN in variable "hostname"? |
| 1450 | */ |
| 1451 | n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); |
| 1452 | if (n->m_next == NULL) |
| 1453 | goto bad; |
| 1454 | /* XXX we assume that n->m_next is not a chain */ |
| 1455 | if (n->m_next->m_next != NULL) |
| 1456 | goto bad; |
| 1457 | n->m_pkthdr.len += n->m_next->m_len; |
| 1458 | break; |
| 1459 | case NI_QTYPE_NODEADDR: |
| 1460 | { |
| 1461 | int lenlim, copied; |
| 1462 | |
| 1463 | nni6->ni_code = ICMP6_NI_SUCCESS; |
| 1464 | n->m_pkthdr.len = n->m_len = |
| 1465 | sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); |
| 1466 | lenlim = M_TRAILINGSPACE(n); |
| 1467 | copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); |
| 1468 | if_put(ifp, &psref); |
| 1469 | ifp = NULL; |
| 1470 | /* XXX: reset mbuf length */ |
| 1471 | n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + |
| 1472 | sizeof(struct icmp6_nodeinfo) + copied; |
| 1473 | break; |
| 1474 | } |
| 1475 | default: |
| 1476 | break; /* XXX impossible! */ |
| 1477 | } |
| 1478 | |
| 1479 | nni6->ni_type = ICMP6_NI_REPLY; |
| 1480 | m_freem(m); |
| 1481 | return (n); |
| 1482 | |
| 1483 | bad: |
| 1484 | if_put(ifp, &psref); |
| 1485 | m_freem(m); |
| 1486 | if (n) |
| 1487 | m_freem(n); |
| 1488 | return (NULL); |
| 1489 | } |
| 1490 | #undef hostnamelen |
| 1491 | |
| 1492 | #define isupper(x) ('A' <= (x) && (x) <= 'Z') |
| 1493 | #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) |
| 1494 | #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) |
| 1495 | #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) |
| 1496 | |
| 1497 | /* |
| 1498 | * make a mbuf with DNS-encoded string. no compression support. |
| 1499 | * |
| 1500 | * XXX names with less than 2 dots (like "foo" or "foo.section") will be |
| 1501 | * treated as truncated name (two \0 at the end). this is a wild guess. |
| 1502 | * |
| 1503 | * old - return pascal string if non-zero |
| 1504 | */ |
| 1505 | static struct mbuf * |
| 1506 | ni6_nametodns(const char *name, int namelen, int old) |
| 1507 | { |
| 1508 | struct mbuf *m; |
| 1509 | char *cp, *ep; |
| 1510 | const char *p, *q; |
| 1511 | int i, len, nterm; |
| 1512 | |
| 1513 | if (old) |
| 1514 | len = namelen + 1; |
| 1515 | else |
| 1516 | len = MCLBYTES; |
| 1517 | |
| 1518 | /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ |
| 1519 | MGET(m, M_DONTWAIT, MT_DATA); |
| 1520 | if (m && len > MLEN) { |
| 1521 | MCLGET(m, M_DONTWAIT); |
| 1522 | if ((m->m_flags & M_EXT) == 0) |
| 1523 | goto fail; |
| 1524 | } |
| 1525 | if (!m) |
| 1526 | goto fail; |
| 1527 | m->m_next = NULL; |
| 1528 | |
| 1529 | if (old) { |
| 1530 | m->m_len = len; |
| 1531 | *mtod(m, char *) = namelen; |
| 1532 | bcopy(name, mtod(m, char *) + 1, namelen); |
| 1533 | return m; |
| 1534 | } else { |
| 1535 | m->m_len = 0; |
| 1536 | cp = mtod(m, char *); |
| 1537 | ep = mtod(m, char *) + M_TRAILINGSPACE(m); |
| 1538 | |
| 1539 | /* if not certain about my name, return empty buffer */ |
| 1540 | if (namelen == 0) |
| 1541 | return m; |
| 1542 | |
| 1543 | /* |
| 1544 | * guess if it looks like shortened hostname, or FQDN. |
| 1545 | * shortened hostname needs two trailing "\0". |
| 1546 | */ |
| 1547 | i = 0; |
| 1548 | for (p = name; p < name + namelen; p++) { |
| 1549 | if (*p == '.') |
| 1550 | i++; |
| 1551 | } |
| 1552 | if (i < 2) |
| 1553 | nterm = 2; |
| 1554 | else |
| 1555 | nterm = 1; |
| 1556 | |
| 1557 | p = name; |
| 1558 | while (cp < ep && p < name + namelen) { |
| 1559 | i = 0; |
| 1560 | for (q = p; q < name + namelen && *q && *q != '.'; q++) |
| 1561 | i++; |
| 1562 | /* result does not fit into mbuf */ |
| 1563 | if (cp + i + 1 >= ep) |
| 1564 | goto fail; |
| 1565 | /* |
| 1566 | * DNS label length restriction, RFC1035 page 8. |
| 1567 | * "i == 0" case is included here to avoid returning |
| 1568 | * 0-length label on "foo..bar". |
| 1569 | */ |
| 1570 | if (i <= 0 || i >= 64) |
| 1571 | goto fail; |
| 1572 | *cp++ = i; |
| 1573 | if (!isalpha(p[0]) || !isalnum(p[i - 1])) |
| 1574 | goto fail; |
| 1575 | while (i > 0) { |
| 1576 | if (!isalnum(*p) && *p != '-') |
| 1577 | goto fail; |
| 1578 | if (isupper(*p)) { |
| 1579 | *cp++ = tolower(*p); |
| 1580 | p++; |
| 1581 | } else |
| 1582 | *cp++ = *p++; |
| 1583 | i--; |
| 1584 | } |
| 1585 | p = q; |
| 1586 | if (p < name + namelen && *p == '.') |
| 1587 | p++; |
| 1588 | } |
| 1589 | /* termination */ |
| 1590 | if (cp + nterm >= ep) |
| 1591 | goto fail; |
| 1592 | while (nterm-- > 0) |
| 1593 | *cp++ = '\0'; |
| 1594 | m->m_len = cp - mtod(m, char *); |
| 1595 | return m; |
| 1596 | } |
| 1597 | |
| 1598 | panic("should not reach here" ); |
| 1599 | /* NOTREACHED */ |
| 1600 | |
| 1601 | fail: |
| 1602 | if (m) |
| 1603 | m_freem(m); |
| 1604 | return NULL; |
| 1605 | } |
| 1606 | |
| 1607 | /* |
| 1608 | * check if two DNS-encoded string matches. takes care of truncated |
| 1609 | * form (with \0\0 at the end). no compression support. |
| 1610 | * XXX upper/lowercase match (see RFC2065) |
| 1611 | */ |
| 1612 | static int |
| 1613 | ni6_dnsmatch(const char *a, int alen, const char *b, int blen) |
| 1614 | { |
| 1615 | const char *a0, *b0; |
| 1616 | int l; |
| 1617 | |
| 1618 | /* simplest case - need validation? */ |
| 1619 | if (alen == blen && memcmp(a, b, alen) == 0) |
| 1620 | return 1; |
| 1621 | |
| 1622 | a0 = a; |
| 1623 | b0 = b; |
| 1624 | |
| 1625 | /* termination is mandatory */ |
| 1626 | if (alen < 2 || blen < 2) |
| 1627 | return 0; |
| 1628 | if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') |
| 1629 | return 0; |
| 1630 | alen--; |
| 1631 | blen--; |
| 1632 | |
| 1633 | while (a - a0 < alen && b - b0 < blen) { |
| 1634 | if (a - a0 + 1 > alen || b - b0 + 1 > blen) |
| 1635 | return 0; |
| 1636 | |
| 1637 | if ((signed char)a[0] < 0 || (signed char)b[0] < 0) |
| 1638 | return 0; |
| 1639 | /* we don't support compression yet */ |
| 1640 | if (a[0] >= 64 || b[0] >= 64) |
| 1641 | return 0; |
| 1642 | |
| 1643 | /* truncated case */ |
| 1644 | if (a[0] == 0 && a - a0 == alen - 1) |
| 1645 | return 1; |
| 1646 | if (b[0] == 0 && b - b0 == blen - 1) |
| 1647 | return 1; |
| 1648 | if (a[0] == 0 || b[0] == 0) |
| 1649 | return 0; |
| 1650 | |
| 1651 | if (a[0] != b[0]) |
| 1652 | return 0; |
| 1653 | l = a[0]; |
| 1654 | if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) |
| 1655 | return 0; |
| 1656 | if (memcmp(a + 1, b + 1, l) != 0) |
| 1657 | return 0; |
| 1658 | |
| 1659 | a += 1 + l; |
| 1660 | b += 1 + l; |
| 1661 | } |
| 1662 | |
| 1663 | if (a - a0 == alen && b - b0 == blen) |
| 1664 | return 1; |
| 1665 | else |
| 1666 | return 0; |
| 1667 | } |
| 1668 | |
| 1669 | /* |
| 1670 | * calculate the number of addresses to be returned in the node info reply. |
| 1671 | */ |
| 1672 | static int |
| 1673 | ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, |
| 1674 | struct ifnet **ifpp, char *subj, struct psref *psref) |
| 1675 | { |
| 1676 | struct ifnet *ifp; |
| 1677 | struct in6_ifaddr *ia6; |
| 1678 | struct ifaddr *ifa; |
| 1679 | struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ |
| 1680 | int addrs = 0, addrsofif, iffound = 0; |
| 1681 | int niflags = ni6->ni_flags; |
| 1682 | int s; |
| 1683 | |
| 1684 | if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { |
| 1685 | switch (ni6->ni_code) { |
| 1686 | case ICMP6_NI_SUBJ_IPV6: |
| 1687 | if (subj == NULL) /* must be impossible... */ |
| 1688 | return (0); |
| 1689 | subj_ip6 = (struct sockaddr_in6 *)subj; |
| 1690 | break; |
| 1691 | default: |
| 1692 | /* |
| 1693 | * XXX: we only support IPv6 subject address for |
| 1694 | * this Qtype. |
| 1695 | */ |
| 1696 | return (0); |
| 1697 | } |
| 1698 | } |
| 1699 | |
| 1700 | s = pserialize_read_enter(); |
| 1701 | IFNET_READER_FOREACH(ifp) { |
| 1702 | addrsofif = 0; |
| 1703 | IFADDR_READER_FOREACH(ifa, ifp) { |
| 1704 | if (ifa->ifa_addr->sa_family != AF_INET6) |
| 1705 | continue; |
| 1706 | ia6 = (struct in6_ifaddr *)ifa; |
| 1707 | |
| 1708 | if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && |
| 1709 | IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, |
| 1710 | &ia6->ia_addr.sin6_addr)) |
| 1711 | iffound = 1; |
| 1712 | |
| 1713 | /* |
| 1714 | * IPv4-mapped addresses can only be returned by a |
| 1715 | * Node Information proxy, since they represent |
| 1716 | * addresses of IPv4-only nodes, which perforce do |
| 1717 | * not implement this protocol. |
| 1718 | * [icmp-name-lookups-07, Section 5.4] |
| 1719 | * So we don't support NI_NODEADDR_FLAG_COMPAT in |
| 1720 | * this function at this moment. |
| 1721 | */ |
| 1722 | |
| 1723 | /* What do we have to do about ::1? */ |
| 1724 | switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { |
| 1725 | case IPV6_ADDR_SCOPE_LINKLOCAL: |
| 1726 | if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) |
| 1727 | continue; |
| 1728 | break; |
| 1729 | case IPV6_ADDR_SCOPE_SITELOCAL: |
| 1730 | if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) |
| 1731 | continue; |
| 1732 | break; |
| 1733 | case IPV6_ADDR_SCOPE_GLOBAL: |
| 1734 | if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) |
| 1735 | continue; |
| 1736 | break; |
| 1737 | default: |
| 1738 | continue; |
| 1739 | } |
| 1740 | |
| 1741 | /* |
| 1742 | * check if anycast is okay. |
| 1743 | * XXX: just experimental. not in the spec. |
| 1744 | */ |
| 1745 | if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && |
| 1746 | (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) |
| 1747 | continue; /* we need only unicast addresses */ |
| 1748 | |
| 1749 | addrsofif++; /* count the address */ |
| 1750 | } |
| 1751 | if (iffound) { |
| 1752 | if_acquire_NOMPSAFE(ifp, psref); |
| 1753 | pserialize_read_exit(s); |
| 1754 | *ifpp = ifp; |
| 1755 | return (addrsofif); |
| 1756 | } |
| 1757 | |
| 1758 | addrs += addrsofif; |
| 1759 | } |
| 1760 | pserialize_read_exit(s); |
| 1761 | |
| 1762 | return (addrs); |
| 1763 | } |
| 1764 | |
| 1765 | static int |
| 1766 | ni6_store_addrs(struct icmp6_nodeinfo *ni6, |
| 1767 | struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, |
| 1768 | int resid) |
| 1769 | { |
| 1770 | struct ifnet *ifp; |
| 1771 | struct in6_ifaddr *ia6; |
| 1772 | struct ifaddr *ifa; |
| 1773 | struct ifnet *ifp_dep = NULL; |
| 1774 | int copied = 0, allow_deprecated = 0; |
| 1775 | u_char *cp = (u_char *)(nni6 + 1); |
| 1776 | int niflags = ni6->ni_flags; |
| 1777 | u_int32_t ltime; |
| 1778 | int s; |
| 1779 | |
| 1780 | if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) |
| 1781 | return (0); /* needless to copy */ |
| 1782 | |
| 1783 | s = pserialize_read_enter(); |
| 1784 | ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); |
| 1785 | again: |
| 1786 | |
| 1787 | for (; ifp; ifp = IFNET_READER_NEXT(ifp)) |
| 1788 | { |
| 1789 | IFADDR_READER_FOREACH(ifa, ifp) { |
| 1790 | if (ifa->ifa_addr->sa_family != AF_INET6) |
| 1791 | continue; |
| 1792 | ia6 = (struct in6_ifaddr *)ifa; |
| 1793 | |
| 1794 | if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && |
| 1795 | allow_deprecated == 0) { |
| 1796 | /* |
| 1797 | * prefererred address should be put before |
| 1798 | * deprecated addresses. |
| 1799 | */ |
| 1800 | |
| 1801 | /* record the interface for later search */ |
| 1802 | if (ifp_dep == NULL) |
| 1803 | ifp_dep = ifp; |
| 1804 | |
| 1805 | continue; |
| 1806 | } |
| 1807 | else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && |
| 1808 | allow_deprecated != 0) |
| 1809 | continue; /* we now collect deprecated addrs */ |
| 1810 | |
| 1811 | /* What do we have to do about ::1? */ |
| 1812 | switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { |
| 1813 | case IPV6_ADDR_SCOPE_LINKLOCAL: |
| 1814 | if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) |
| 1815 | continue; |
| 1816 | break; |
| 1817 | case IPV6_ADDR_SCOPE_SITELOCAL: |
| 1818 | if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) |
| 1819 | continue; |
| 1820 | break; |
| 1821 | case IPV6_ADDR_SCOPE_GLOBAL: |
| 1822 | if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) |
| 1823 | continue; |
| 1824 | break; |
| 1825 | default: |
| 1826 | continue; |
| 1827 | } |
| 1828 | |
| 1829 | /* |
| 1830 | * check if anycast is okay. |
| 1831 | * XXX: just experimental. not in the spec. |
| 1832 | */ |
| 1833 | if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && |
| 1834 | (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) |
| 1835 | continue; |
| 1836 | |
| 1837 | /* now we can copy the address */ |
| 1838 | if (resid < sizeof(struct in6_addr) + |
| 1839 | sizeof(u_int32_t)) { |
| 1840 | /* |
| 1841 | * We give up much more copy. |
| 1842 | * Set the truncate flag and return. |
| 1843 | */ |
| 1844 | nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; |
| 1845 | goto out; |
| 1846 | } |
| 1847 | |
| 1848 | /* |
| 1849 | * Set the TTL of the address. |
| 1850 | * The TTL value should be one of the following |
| 1851 | * according to the specification: |
| 1852 | * |
| 1853 | * 1. The remaining lifetime of a DHCP lease on the |
| 1854 | * address, or |
| 1855 | * 2. The remaining Valid Lifetime of a prefix from |
| 1856 | * which the address was derived through Stateless |
| 1857 | * Autoconfiguration. |
| 1858 | * |
| 1859 | * Note that we currently do not support stateful |
| 1860 | * address configuration by DHCPv6, so the former |
| 1861 | * case can't happen. |
| 1862 | * |
| 1863 | * TTL must be 2^31 > TTL >= 0. |
| 1864 | */ |
| 1865 | if (ia6->ia6_lifetime.ia6t_expire == 0) |
| 1866 | ltime = ND6_INFINITE_LIFETIME; |
| 1867 | else { |
| 1868 | if (ia6->ia6_lifetime.ia6t_expire > |
| 1869 | time_uptime) |
| 1870 | ltime = ia6->ia6_lifetime.ia6t_expire - |
| 1871 | time_uptime; |
| 1872 | else |
| 1873 | ltime = 0; |
| 1874 | } |
| 1875 | if (ltime > 0x7fffffff) |
| 1876 | ltime = 0x7fffffff; |
| 1877 | ltime = htonl(ltime); |
| 1878 | |
| 1879 | bcopy(<ime, cp, sizeof(u_int32_t)); |
| 1880 | cp += sizeof(u_int32_t); |
| 1881 | |
| 1882 | /* copy the address itself */ |
| 1883 | bcopy(&ia6->ia_addr.sin6_addr, cp, |
| 1884 | sizeof(struct in6_addr)); |
| 1885 | in6_clearscope((struct in6_addr *)cp); /* XXX */ |
| 1886 | cp += sizeof(struct in6_addr); |
| 1887 | |
| 1888 | resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); |
| 1889 | copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); |
| 1890 | } |
| 1891 | if (ifp0) /* we need search only on the specified IF */ |
| 1892 | break; |
| 1893 | } |
| 1894 | |
| 1895 | if (allow_deprecated == 0 && ifp_dep != NULL) { |
| 1896 | ifp = ifp_dep; |
| 1897 | allow_deprecated = 1; |
| 1898 | |
| 1899 | goto again; |
| 1900 | } |
| 1901 | out: |
| 1902 | pserialize_read_exit(s); |
| 1903 | return (copied); |
| 1904 | } |
| 1905 | |
| 1906 | /* |
| 1907 | * XXX almost dup'ed code with rip6_input. |
| 1908 | */ |
| 1909 | static int |
| 1910 | icmp6_rip6_input(struct mbuf **mp, int off) |
| 1911 | { |
| 1912 | struct mbuf *m = *mp; |
| 1913 | struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); |
| 1914 | struct inpcb_hdr *inph; |
| 1915 | struct in6pcb *in6p; |
| 1916 | struct in6pcb *last = NULL; |
| 1917 | struct sockaddr_in6 rip6src; |
| 1918 | struct icmp6_hdr *icmp6; |
| 1919 | struct mbuf *opts = NULL; |
| 1920 | |
| 1921 | IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); |
| 1922 | if (icmp6 == NULL) { |
| 1923 | /* m is already reclaimed */ |
| 1924 | return IPPROTO_DONE; |
| 1925 | } |
| 1926 | |
| 1927 | /* |
| 1928 | * XXX: the address may have embedded scope zone ID, which should be |
| 1929 | * hidden from applications. |
| 1930 | */ |
| 1931 | sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); |
| 1932 | if (sa6_recoverscope(&rip6src)) { |
| 1933 | m_freem(m); |
| 1934 | return (IPPROTO_DONE); |
| 1935 | } |
| 1936 | |
| 1937 | TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { |
| 1938 | in6p = (struct in6pcb *)inph; |
| 1939 | if (in6p->in6p_af != AF_INET6) |
| 1940 | continue; |
| 1941 | if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) |
| 1942 | continue; |
| 1943 | if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && |
| 1944 | !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) |
| 1945 | continue; |
| 1946 | if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && |
| 1947 | !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) |
| 1948 | continue; |
| 1949 | if (in6p->in6p_icmp6filt |
| 1950 | && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, |
| 1951 | in6p->in6p_icmp6filt)) |
| 1952 | continue; |
| 1953 | if (last) { |
| 1954 | struct mbuf *n; |
| 1955 | if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { |
| 1956 | if (last->in6p_flags & IN6P_CONTROLOPTS) |
| 1957 | ip6_savecontrol(last, &opts, ip6, n); |
| 1958 | /* strip intermediate headers */ |
| 1959 | m_adj(n, off); |
| 1960 | if (sbappendaddr(&last->in6p_socket->so_rcv, |
| 1961 | sin6tosa(&rip6src), n, opts) == 0) { |
| 1962 | /* should notify about lost packet */ |
| 1963 | m_freem(n); |
| 1964 | if (opts) |
| 1965 | m_freem(opts); |
| 1966 | } else |
| 1967 | sorwakeup(last->in6p_socket); |
| 1968 | opts = NULL; |
| 1969 | } |
| 1970 | } |
| 1971 | last = in6p; |
| 1972 | } |
| 1973 | if (last) { |
| 1974 | if (last->in6p_flags & IN6P_CONTROLOPTS) |
| 1975 | ip6_savecontrol(last, &opts, ip6, m); |
| 1976 | /* strip intermediate headers */ |
| 1977 | m_adj(m, off); |
| 1978 | if (sbappendaddr(&last->in6p_socket->so_rcv, |
| 1979 | sin6tosa(&rip6src), m, opts) == 0) { |
| 1980 | m_freem(m); |
| 1981 | if (opts) |
| 1982 | m_freem(opts); |
| 1983 | } else |
| 1984 | sorwakeup(last->in6p_socket); |
| 1985 | } else { |
| 1986 | m_freem(m); |
| 1987 | IP6_STATDEC(IP6_STAT_DELIVERED); |
| 1988 | } |
| 1989 | return IPPROTO_DONE; |
| 1990 | } |
| 1991 | |
| 1992 | /* |
| 1993 | * Reflect the ip6 packet back to the source. |
| 1994 | * OFF points to the icmp6 header, counted from the top of the mbuf. |
| 1995 | * |
| 1996 | * Note: RFC 1885 required that an echo reply should be truncated if it |
| 1997 | * did not fit in with (return) path MTU, and KAME code supported the |
| 1998 | * behavior. However, as a clarification after the RFC, this limitation |
| 1999 | * was removed in a revised version of the spec, RFC 2463. We had kept the |
| 2000 | * old behavior, with a (non-default) ifdef block, while the new version of |
| 2001 | * the spec was an internet-draft status, and even after the new RFC was |
| 2002 | * published. But it would rather make sense to clean the obsoleted part |
| 2003 | * up, and to make the code simpler at this stage. |
| 2004 | */ |
| 2005 | void |
| 2006 | icmp6_reflect(struct mbuf *m, size_t off) |
| 2007 | { |
| 2008 | struct ip6_hdr *ip6; |
| 2009 | struct icmp6_hdr *icmp6; |
| 2010 | const struct in6_ifaddr *ia; |
| 2011 | const struct ip6aux *ip6a; |
| 2012 | int plen; |
| 2013 | int type, code; |
| 2014 | struct ifnet *outif = NULL; |
| 2015 | struct in6_addr origdst; |
| 2016 | struct ifnet *rcvif; |
| 2017 | int s; |
| 2018 | bool ip6_src_filled = false; |
| 2019 | |
| 2020 | /* too short to reflect */ |
| 2021 | if (off < sizeof(struct ip6_hdr)) { |
| 2022 | nd6log(LOG_DEBUG, |
| 2023 | "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n" , |
| 2024 | (u_long)off, (u_long)sizeof(struct ip6_hdr), |
| 2025 | __FILE__, __LINE__); |
| 2026 | goto bad; |
| 2027 | } |
| 2028 | |
| 2029 | /* |
| 2030 | * If there are extra headers between IPv6 and ICMPv6, strip |
| 2031 | * off that header first. |
| 2032 | */ |
| 2033 | #ifdef DIAGNOSTIC |
| 2034 | if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) |
| 2035 | panic("assumption failed in icmp6_reflect" ); |
| 2036 | #endif |
| 2037 | if (off > sizeof(struct ip6_hdr)) { |
| 2038 | size_t l; |
| 2039 | struct ip6_hdr nip6; |
| 2040 | |
| 2041 | l = off - sizeof(struct ip6_hdr); |
| 2042 | m_copydata(m, 0, sizeof(nip6), (void *)&nip6); |
| 2043 | m_adj(m, l); |
| 2044 | l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); |
| 2045 | if (m->m_len < l) { |
| 2046 | if ((m = m_pullup(m, l)) == NULL) |
| 2047 | return; |
| 2048 | } |
| 2049 | bcopy((void *)&nip6, mtod(m, void *), sizeof(nip6)); |
| 2050 | } else /* off == sizeof(struct ip6_hdr) */ { |
| 2051 | size_t l; |
| 2052 | l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); |
| 2053 | if (m->m_len < l) { |
| 2054 | if ((m = m_pullup(m, l)) == NULL) |
| 2055 | return; |
| 2056 | } |
| 2057 | } |
| 2058 | plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); |
| 2059 | ip6 = mtod(m, struct ip6_hdr *); |
| 2060 | ip6->ip6_nxt = IPPROTO_ICMPV6; |
| 2061 | icmp6 = (struct icmp6_hdr *)(ip6 + 1); |
| 2062 | type = icmp6->icmp6_type; /* keep type for statistics */ |
| 2063 | code = icmp6->icmp6_code; /* ditto. */ |
| 2064 | |
| 2065 | origdst = ip6->ip6_dst; |
| 2066 | /* |
| 2067 | * ip6_input() drops a packet if its src is multicast. |
| 2068 | * So, the src is never multicast. |
| 2069 | */ |
| 2070 | ip6->ip6_dst = ip6->ip6_src; |
| 2071 | |
| 2072 | /* |
| 2073 | * If the incoming packet was addressed directly to us (i.e. unicast), |
| 2074 | * use dst as the src for the reply. |
| 2075 | * The IN6_IFF_NOTREADY case should be VERY rare, but is possible |
| 2076 | * (for example) when we encounter an error while forwarding procedure |
| 2077 | * destined to a duplicated address of ours. |
| 2078 | * Note that ip6_getdstifaddr() may fail if we are in an error handling |
| 2079 | * procedure of an outgoing packet of our own, in which case we need |
| 2080 | * to search in the ifaddr list. |
| 2081 | */ |
| 2082 | if (IN6_IS_ADDR_MULTICAST(&origdst)) |
| 2083 | ; |
| 2084 | else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { |
| 2085 | if ((ip6a->ip6a_flags & |
| 2086 | (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { |
| 2087 | ip6->ip6_src = ip6a->ip6a_src; |
| 2088 | ip6_src_filled = true; |
| 2089 | } |
| 2090 | } else { |
| 2091 | union { |
| 2092 | struct sockaddr_in6 sin6; |
| 2093 | struct sockaddr sa; |
| 2094 | } u; |
| 2095 | int _s; |
| 2096 | struct ifaddr *ifa; |
| 2097 | |
| 2098 | sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); |
| 2099 | |
| 2100 | _s = pserialize_read_enter(); |
| 2101 | ifa = ifa_ifwithaddr(&u.sa); |
| 2102 | |
| 2103 | if (ifa != NULL) { |
| 2104 | ia = ifatoia6(ifa); |
| 2105 | if ((ia->ia6_flags & |
| 2106 | (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { |
| 2107 | ip6->ip6_src = ia->ia_addr.sin6_addr; |
| 2108 | ip6_src_filled = true; |
| 2109 | } |
| 2110 | } |
| 2111 | pserialize_read_exit(_s); |
| 2112 | } |
| 2113 | |
| 2114 | if (!ip6_src_filled) { |
| 2115 | int e; |
| 2116 | struct sockaddr_in6 sin6; |
| 2117 | struct route ro; |
| 2118 | |
| 2119 | /* |
| 2120 | * This case matches to multicasts, our anycast, or unicasts |
| 2121 | * that we do not own. Select a source address based on the |
| 2122 | * source address of the erroneous packet. |
| 2123 | */ |
| 2124 | /* zone ID should be embedded */ |
| 2125 | sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); |
| 2126 | |
| 2127 | memset(&ro, 0, sizeof(ro)); |
| 2128 | e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, |
| 2129 | &ip6->ip6_src); |
| 2130 | rtcache_free(&ro); |
| 2131 | if (e != 0) { |
| 2132 | nd6log(LOG_DEBUG, |
| 2133 | "source can't be determined: " |
| 2134 | "dst=%s, error=%d\n" , |
| 2135 | ip6_sprintf(&sin6.sin6_addr), e); |
| 2136 | goto bad; |
| 2137 | } |
| 2138 | } |
| 2139 | |
| 2140 | ip6->ip6_flow = 0; |
| 2141 | ip6->ip6_vfc &= ~IPV6_VERSION_MASK; |
| 2142 | ip6->ip6_vfc |= IPV6_VERSION; |
| 2143 | ip6->ip6_nxt = IPPROTO_ICMPV6; |
| 2144 | rcvif = m_get_rcvif(m, &s); |
| 2145 | if (rcvif) { |
| 2146 | /* XXX: This may not be the outgoing interface */ |
| 2147 | ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; |
| 2148 | } else |
| 2149 | ip6->ip6_hlim = ip6_defhlim; |
| 2150 | m_put_rcvif(rcvif, &s); |
| 2151 | |
| 2152 | m->m_pkthdr.csum_flags = 0; |
| 2153 | icmp6->icmp6_cksum = 0; |
| 2154 | icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, |
| 2155 | sizeof(struct ip6_hdr), plen); |
| 2156 | |
| 2157 | /* |
| 2158 | * XXX option handling |
| 2159 | */ |
| 2160 | |
| 2161 | m->m_flags &= ~(M_BCAST|M_MCAST); |
| 2162 | |
| 2163 | /* |
| 2164 | * To avoid a "too big" situation at an intermediate router |
| 2165 | * and the path MTU discovery process, specify the IPV6_MINMTU flag. |
| 2166 | * Note that only echo and node information replies are affected, |
| 2167 | * since the length of ICMP6 errors is limited to the minimum MTU. |
| 2168 | */ |
| 2169 | if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) |
| 2170 | != 0 && outif) |
| 2171 | icmp6_ifstat_inc(outif, ifs6_out_error); |
| 2172 | if (outif) |
| 2173 | icmp6_ifoutstat_inc(outif, type, code); |
| 2174 | |
| 2175 | return; |
| 2176 | |
| 2177 | bad: |
| 2178 | m_freem(m); |
| 2179 | return; |
| 2180 | } |
| 2181 | |
| 2182 | static const char * |
| 2183 | icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, |
| 2184 | struct in6_addr *tgt6) |
| 2185 | { |
| 2186 | static char buf[1024]; |
| 2187 | snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)" , |
| 2188 | ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); |
| 2189 | return buf; |
| 2190 | } |
| 2191 | |
| 2192 | void |
| 2193 | icmp6_redirect_input(struct mbuf *m, int off) |
| 2194 | { |
| 2195 | struct ifnet *ifp; |
| 2196 | struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); |
| 2197 | struct nd_redirect *nd_rd; |
| 2198 | int icmp6len = ntohs(ip6->ip6_plen); |
| 2199 | char *lladdr = NULL; |
| 2200 | int lladdrlen = 0; |
| 2201 | struct rtentry *rt = NULL; |
| 2202 | int is_router; |
| 2203 | int is_onlink; |
| 2204 | struct in6_addr src6 = ip6->ip6_src; |
| 2205 | struct in6_addr redtgt6; |
| 2206 | struct in6_addr reddst6; |
| 2207 | union nd_opts ndopts; |
| 2208 | struct psref psref; |
| 2209 | |
| 2210 | ifp = m_get_rcvif_psref(m, &psref); |
| 2211 | if (ifp == NULL) |
| 2212 | goto freeit; |
| 2213 | |
| 2214 | /* XXX if we are router, we don't update route by icmp6 redirect */ |
| 2215 | if (ip6_forwarding) |
| 2216 | goto freeit; |
| 2217 | if (!icmp6_rediraccept) |
| 2218 | goto freeit; |
| 2219 | |
| 2220 | IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); |
| 2221 | if (nd_rd == NULL) { |
| 2222 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 2223 | m_put_rcvif_psref(ifp, &psref); |
| 2224 | return; |
| 2225 | } |
| 2226 | redtgt6 = nd_rd->nd_rd_target; |
| 2227 | reddst6 = nd_rd->nd_rd_dst; |
| 2228 | |
| 2229 | if (in6_setscope(&redtgt6, ifp, NULL) || |
| 2230 | in6_setscope(&reddst6, ifp, NULL)) { |
| 2231 | goto freeit; |
| 2232 | } |
| 2233 | |
| 2234 | /* validation */ |
| 2235 | if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { |
| 2236 | nd6log(LOG_ERR, |
| 2237 | "ICMP6 redirect sent from %s rejected; " |
| 2238 | "must be from linklocal\n" , ip6_sprintf(&src6)); |
| 2239 | goto bad; |
| 2240 | } |
| 2241 | if (ip6->ip6_hlim != 255) { |
| 2242 | nd6log(LOG_ERR, |
| 2243 | "ICMP6 redirect sent from %s rejected; " |
| 2244 | "hlim=%d (must be 255)\n" , |
| 2245 | ip6_sprintf(&src6), ip6->ip6_hlim); |
| 2246 | goto bad; |
| 2247 | } |
| 2248 | { |
| 2249 | /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ |
| 2250 | struct sockaddr_in6 sin6; |
| 2251 | struct in6_addr *gw6; |
| 2252 | |
| 2253 | sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); |
| 2254 | rt = rtalloc1(sin6tosa(&sin6), 0); |
| 2255 | if (rt) { |
| 2256 | if (rt->rt_gateway == NULL || |
| 2257 | rt->rt_gateway->sa_family != AF_INET6) { |
| 2258 | nd6log(LOG_ERR, |
| 2259 | "ICMP6 redirect rejected; no route " |
| 2260 | "with inet6 gateway found for redirect dst: %s\n" , |
| 2261 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); |
| 2262 | rtfree(rt); |
| 2263 | goto bad; |
| 2264 | } |
| 2265 | |
| 2266 | gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); |
| 2267 | if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { |
| 2268 | nd6log(LOG_ERR, |
| 2269 | "ICMP6 redirect rejected; " |
| 2270 | "not equal to gw-for-src=%s (must be same): %s\n" , |
| 2271 | ip6_sprintf(gw6), |
| 2272 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); |
| 2273 | rtfree(rt); |
| 2274 | goto bad; |
| 2275 | } |
| 2276 | } else { |
| 2277 | nd6log(LOG_ERR, "ICMP6 redirect rejected; " |
| 2278 | "no route found for redirect dst: %s\n" , |
| 2279 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); |
| 2280 | goto bad; |
| 2281 | } |
| 2282 | rtfree(rt); |
| 2283 | rt = NULL; |
| 2284 | } |
| 2285 | if (IN6_IS_ADDR_MULTICAST(&reddst6)) { |
| 2286 | nd6log(LOG_ERR, "ICMP6 redirect rejected; " |
| 2287 | "redirect dst must be unicast: %s\n" , |
| 2288 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); |
| 2289 | goto bad; |
| 2290 | } |
| 2291 | |
| 2292 | is_router = is_onlink = 0; |
| 2293 | if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) |
| 2294 | is_router = 1; /* router case */ |
| 2295 | if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) |
| 2296 | is_onlink = 1; /* on-link destination case */ |
| 2297 | if (!is_router && !is_onlink) { |
| 2298 | nd6log(LOG_ERR, "ICMP6 redirect rejected; " |
| 2299 | "neither router case nor onlink case: %s\n" , |
| 2300 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); |
| 2301 | goto bad; |
| 2302 | } |
| 2303 | /* validation passed */ |
| 2304 | |
| 2305 | icmp6len -= sizeof(*nd_rd); |
| 2306 | nd6_option_init(nd_rd + 1, icmp6len, &ndopts); |
| 2307 | if (nd6_options(&ndopts) < 0) { |
| 2308 | nd6log(LOG_INFO, "invalid ND option, rejected: %s\n" , |
| 2309 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); |
| 2310 | /* nd6_options have incremented stats */ |
| 2311 | goto freeit; |
| 2312 | } |
| 2313 | |
| 2314 | if (ndopts.nd_opts_tgt_lladdr) { |
| 2315 | lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); |
| 2316 | lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; |
| 2317 | } |
| 2318 | |
| 2319 | if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { |
| 2320 | nd6log(LOG_INFO, "lladdrlen mismatch for %s " |
| 2321 | "(if %d, icmp6 packet %d): %s\n" , |
| 2322 | ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, |
| 2323 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); |
| 2324 | goto bad; |
| 2325 | } |
| 2326 | |
| 2327 | /* RFC 2461 8.3 */ |
| 2328 | nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, |
| 2329 | is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); |
| 2330 | |
| 2331 | m_put_rcvif_psref(ifp, &psref); |
| 2332 | ifp = NULL; |
| 2333 | |
| 2334 | if (!is_onlink) { /* better router case. perform rtredirect. */ |
| 2335 | /* perform rtredirect */ |
| 2336 | struct sockaddr_in6 sdst; |
| 2337 | struct sockaddr_in6 sgw; |
| 2338 | struct sockaddr_in6 ssrc; |
| 2339 | unsigned long rtcount; |
| 2340 | struct rtentry *newrt = NULL; |
| 2341 | |
| 2342 | /* |
| 2343 | * do not install redirect route, if the number of entries |
| 2344 | * is too much (> hiwat). note that, the node (= host) will |
| 2345 | * work just fine even if we do not install redirect route |
| 2346 | * (there will be additional hops, though). |
| 2347 | */ |
| 2348 | rtcount = rt_timer_count(icmp6_redirect_timeout_q); |
| 2349 | if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) |
| 2350 | goto freeit; |
| 2351 | if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) |
| 2352 | goto freeit; |
| 2353 | else if (0 <= icmp6_redirect_lowat && |
| 2354 | rtcount > icmp6_redirect_lowat) { |
| 2355 | /* |
| 2356 | * XXX nuke a victim, install the new one. |
| 2357 | */ |
| 2358 | } |
| 2359 | |
| 2360 | memset(&sdst, 0, sizeof(sdst)); |
| 2361 | memset(&sgw, 0, sizeof(sgw)); |
| 2362 | memset(&ssrc, 0, sizeof(ssrc)); |
| 2363 | sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; |
| 2364 | sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = |
| 2365 | sizeof(struct sockaddr_in6); |
| 2366 | bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); |
| 2367 | bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); |
| 2368 | bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); |
| 2369 | rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, |
| 2370 | RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), |
| 2371 | &newrt); |
| 2372 | |
| 2373 | if (newrt) { |
| 2374 | (void)rt_timer_add(newrt, icmp6_redirect_timeout, |
| 2375 | icmp6_redirect_timeout_q); |
| 2376 | rtfree(newrt); |
| 2377 | } |
| 2378 | } |
| 2379 | /* finally update cached route in each socket via pfctlinput */ |
| 2380 | { |
| 2381 | struct sockaddr_in6 sdst; |
| 2382 | |
| 2383 | sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); |
| 2384 | pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); |
| 2385 | #if defined(IPSEC) |
| 2386 | if (ipsec_used) |
| 2387 | key_sa_routechange(sin6tosa(&sdst)); |
| 2388 | #endif |
| 2389 | } |
| 2390 | |
| 2391 | freeit: |
| 2392 | if (ifp != NULL) |
| 2393 | m_put_rcvif_psref(ifp, &psref); |
| 2394 | m_freem(m); |
| 2395 | return; |
| 2396 | |
| 2397 | bad: |
| 2398 | m_put_rcvif_psref(ifp, &psref); |
| 2399 | ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); |
| 2400 | m_freem(m); |
| 2401 | } |
| 2402 | |
| 2403 | void |
| 2404 | icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) |
| 2405 | { |
| 2406 | struct ifnet *ifp; /* my outgoing interface */ |
| 2407 | struct in6_addr *ifp_ll6; |
| 2408 | struct in6_addr *nexthop; |
| 2409 | struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ |
| 2410 | struct mbuf *m = NULL; /* newly allocated one */ |
| 2411 | struct ip6_hdr *ip6; /* m as struct ip6_hdr */ |
| 2412 | struct nd_redirect *nd_rd; |
| 2413 | size_t maxlen; |
| 2414 | u_char *p; |
| 2415 | struct sockaddr_in6 src_sa; |
| 2416 | |
| 2417 | icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); |
| 2418 | |
| 2419 | /* if we are not router, we don't send icmp6 redirect */ |
| 2420 | if (!ip6_forwarding) |
| 2421 | goto fail; |
| 2422 | |
| 2423 | /* sanity check */ |
| 2424 | if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) |
| 2425 | goto fail; |
| 2426 | |
| 2427 | /* |
| 2428 | * Address check: |
| 2429 | * the source address must identify a neighbor, and |
| 2430 | * the destination address must not be a multicast address |
| 2431 | * [RFC 2461, sec 8.2] |
| 2432 | */ |
| 2433 | sip6 = mtod(m0, struct ip6_hdr *); |
| 2434 | sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); |
| 2435 | if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) |
| 2436 | goto fail; |
| 2437 | if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) |
| 2438 | goto fail; /* what should we do here? */ |
| 2439 | |
| 2440 | /* rate limit */ |
| 2441 | if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) |
| 2442 | goto fail; |
| 2443 | |
| 2444 | /* |
| 2445 | * Since we are going to append up to 1280 bytes (= IPV6_MMTU), |
| 2446 | * we almost always ask for an mbuf cluster for simplicity. |
| 2447 | * (MHLEN < IPV6_MMTU is almost always true) |
| 2448 | */ |
| 2449 | MGETHDR(m, M_DONTWAIT, MT_HEADER); |
| 2450 | if (m && IPV6_MMTU >= MHLEN) { |
| 2451 | #if IPV6_MMTU >= MCLBYTES |
| 2452 | _MCLGET(m, mcl_cache, IPV6_MMTU, M_DONTWAIT); |
| 2453 | #else |
| 2454 | MCLGET(m, M_DONTWAIT); |
| 2455 | #endif |
| 2456 | } |
| 2457 | |
| 2458 | if (!m) |
| 2459 | goto fail; |
| 2460 | m_reset_rcvif(m); |
| 2461 | m->m_len = 0; |
| 2462 | maxlen = M_TRAILINGSPACE(m); |
| 2463 | maxlen = min(IPV6_MMTU, maxlen); |
| 2464 | /* just for safety */ |
| 2465 | if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + |
| 2466 | ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { |
| 2467 | goto fail; |
| 2468 | } |
| 2469 | |
| 2470 | { |
| 2471 | /* get ip6 linklocal address for ifp(my outgoing interface). */ |
| 2472 | struct in6_ifaddr *ia; |
| 2473 | int s = pserialize_read_enter(); |
| 2474 | if ((ia = in6ifa_ifpforlinklocal(ifp, |
| 2475 | IN6_IFF_NOTREADY| |
| 2476 | IN6_IFF_ANYCAST)) == NULL) { |
| 2477 | pserialize_read_exit(s); |
| 2478 | goto fail; |
| 2479 | } |
| 2480 | ifp_ll6 = &ia->ia_addr.sin6_addr; |
| 2481 | pserialize_read_exit(s); |
| 2482 | } |
| 2483 | |
| 2484 | /* get ip6 linklocal address for the router. */ |
| 2485 | if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { |
| 2486 | struct sockaddr_in6 *sin6; |
| 2487 | sin6 = (struct sockaddr_in6 *)rt->rt_gateway; |
| 2488 | nexthop = &sin6->sin6_addr; |
| 2489 | if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) |
| 2490 | nexthop = NULL; |
| 2491 | } else |
| 2492 | nexthop = NULL; |
| 2493 | |
| 2494 | /* ip6 */ |
| 2495 | ip6 = mtod(m, struct ip6_hdr *); |
| 2496 | ip6->ip6_flow = 0; |
| 2497 | ip6->ip6_vfc &= ~IPV6_VERSION_MASK; |
| 2498 | ip6->ip6_vfc |= IPV6_VERSION; |
| 2499 | /* ip6->ip6_plen will be set later */ |
| 2500 | ip6->ip6_nxt = IPPROTO_ICMPV6; |
| 2501 | ip6->ip6_hlim = 255; |
| 2502 | /* ip6->ip6_src must be linklocal addr for my outgoing if. */ |
| 2503 | bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); |
| 2504 | bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); |
| 2505 | |
| 2506 | /* ND Redirect */ |
| 2507 | nd_rd = (struct nd_redirect *)(ip6 + 1); |
| 2508 | nd_rd->nd_rd_type = ND_REDIRECT; |
| 2509 | nd_rd->nd_rd_code = 0; |
| 2510 | nd_rd->nd_rd_reserved = 0; |
| 2511 | if (rt->rt_flags & RTF_GATEWAY) { |
| 2512 | /* |
| 2513 | * nd_rd->nd_rd_target must be a link-local address in |
| 2514 | * better router cases. |
| 2515 | */ |
| 2516 | if (!nexthop) |
| 2517 | goto fail; |
| 2518 | bcopy(nexthop, &nd_rd->nd_rd_target, |
| 2519 | sizeof(nd_rd->nd_rd_target)); |
| 2520 | bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, |
| 2521 | sizeof(nd_rd->nd_rd_dst)); |
| 2522 | } else { |
| 2523 | /* make sure redtgt == reddst */ |
| 2524 | nexthop = &sip6->ip6_dst; |
| 2525 | bcopy(&sip6->ip6_dst, &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 | } |
| 2530 | |
| 2531 | p = (u_char *)(nd_rd + 1); |
| 2532 | |
| 2533 | { |
| 2534 | /* target lladdr option */ |
| 2535 | struct llentry *ln = NULL; |
| 2536 | int len; |
| 2537 | struct nd_opt_hdr *nd_opt; |
| 2538 | char *lladdr; |
| 2539 | |
| 2540 | ln = nd6_lookup(nexthop, ifp, false); |
| 2541 | if (ln == NULL) |
| 2542 | goto nolladdropt; |
| 2543 | len = sizeof(*nd_opt) + ifp->if_addrlen; |
| 2544 | len = (len + 7) & ~7; /* round by 8 */ |
| 2545 | /* safety check */ |
| 2546 | if (len + (p - (u_char *)ip6) > maxlen) { |
| 2547 | LLE_RUNLOCK(ln); |
| 2548 | goto nolladdropt; |
| 2549 | } |
| 2550 | if (ln->la_flags & LLE_VALID) { |
| 2551 | nd_opt = (struct nd_opt_hdr *)p; |
| 2552 | nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; |
| 2553 | nd_opt->nd_opt_len = len >> 3; |
| 2554 | lladdr = (char *)(nd_opt + 1); |
| 2555 | memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); |
| 2556 | p += len; |
| 2557 | } |
| 2558 | LLE_RUNLOCK(ln); |
| 2559 | } |
| 2560 | nolladdropt:; |
| 2561 | |
| 2562 | m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; |
| 2563 | |
| 2564 | /* just to be safe */ |
| 2565 | if (m0->m_flags & M_DECRYPTED) |
| 2566 | goto noredhdropt; |
| 2567 | if (p - (u_char *)ip6 > maxlen) |
| 2568 | goto noredhdropt; |
| 2569 | |
| 2570 | { |
| 2571 | /* redirected header option */ |
| 2572 | int len; |
| 2573 | struct nd_opt_rd_hdr *nd_opt_rh; |
| 2574 | |
| 2575 | /* |
| 2576 | * compute the maximum size for icmp6 redirect header option. |
| 2577 | * XXX room for auth header? |
| 2578 | */ |
| 2579 | len = maxlen - (p - (u_char *)ip6); |
| 2580 | len &= ~7; |
| 2581 | |
| 2582 | /* |
| 2583 | * Redirected header option spec (RFC2461 4.6.3) talks nothing |
| 2584 | * about padding/truncate rule for the original IP packet. |
| 2585 | * From the discussion on IPv6imp in Feb 1999, |
| 2586 | * the consensus was: |
| 2587 | * - "attach as much as possible" is the goal |
| 2588 | * - pad if not aligned (original size can be guessed by |
| 2589 | * original ip6 header) |
| 2590 | * Following code adds the padding if it is simple enough, |
| 2591 | * and truncates if not. |
| 2592 | */ |
| 2593 | if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { |
| 2594 | /* not enough room, truncate */ |
| 2595 | m_adj(m0, (len - sizeof(*nd_opt_rh)) - |
| 2596 | m0->m_pkthdr.len); |
| 2597 | } else { |
| 2598 | /* |
| 2599 | * enough room, truncate if not aligned. |
| 2600 | * we don't pad here for simplicity. |
| 2601 | */ |
| 2602 | size_t ; |
| 2603 | |
| 2604 | extra = m0->m_pkthdr.len % 8; |
| 2605 | if (extra) { |
| 2606 | /* truncate */ |
| 2607 | m_adj(m0, -extra); |
| 2608 | } |
| 2609 | len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); |
| 2610 | } |
| 2611 | |
| 2612 | nd_opt_rh = (struct nd_opt_rd_hdr *)p; |
| 2613 | memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); |
| 2614 | nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; |
| 2615 | nd_opt_rh->nd_opt_rh_len = len >> 3; |
| 2616 | p += sizeof(*nd_opt_rh); |
| 2617 | m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; |
| 2618 | |
| 2619 | /* connect m0 to m */ |
| 2620 | m->m_pkthdr.len += m0->m_pkthdr.len; |
| 2621 | m_cat(m, m0); |
| 2622 | m0 = NULL; |
| 2623 | } |
| 2624 | noredhdropt: |
| 2625 | if (m0) { |
| 2626 | m_freem(m0); |
| 2627 | m0 = NULL; |
| 2628 | } |
| 2629 | |
| 2630 | /* XXX: clear embedded link IDs in the inner header */ |
| 2631 | in6_clearscope(&sip6->ip6_src); |
| 2632 | in6_clearscope(&sip6->ip6_dst); |
| 2633 | in6_clearscope(&nd_rd->nd_rd_target); |
| 2634 | in6_clearscope(&nd_rd->nd_rd_dst); |
| 2635 | |
| 2636 | ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); |
| 2637 | |
| 2638 | nd_rd->nd_rd_cksum = 0; |
| 2639 | nd_rd->nd_rd_cksum |
| 2640 | = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); |
| 2641 | |
| 2642 | /* send the packet to outside... */ |
| 2643 | if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) |
| 2644 | icmp6_ifstat_inc(ifp, ifs6_out_error); |
| 2645 | |
| 2646 | icmp6_ifstat_inc(ifp, ifs6_out_msg); |
| 2647 | icmp6_ifstat_inc(ifp, ifs6_out_redirect); |
| 2648 | ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); |
| 2649 | |
| 2650 | return; |
| 2651 | |
| 2652 | fail: |
| 2653 | if (m) |
| 2654 | m_freem(m); |
| 2655 | if (m0) |
| 2656 | m_freem(m0); |
| 2657 | } |
| 2658 | |
| 2659 | /* |
| 2660 | * ICMPv6 socket option processing. |
| 2661 | */ |
| 2662 | int |
| 2663 | icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) |
| 2664 | { |
| 2665 | int error = 0; |
| 2666 | struct in6pcb *in6p = sotoin6pcb(so); |
| 2667 | |
| 2668 | if (sopt->sopt_level != IPPROTO_ICMPV6) |
| 2669 | return rip6_ctloutput(op, so, sopt); |
| 2670 | |
| 2671 | switch (op) { |
| 2672 | case PRCO_SETOPT: |
| 2673 | switch (sopt->sopt_name) { |
| 2674 | case ICMP6_FILTER: |
| 2675 | { |
| 2676 | struct icmp6_filter fil; |
| 2677 | |
| 2678 | error = sockopt_get(sopt, &fil, sizeof(fil)); |
| 2679 | if (error) |
| 2680 | break; |
| 2681 | memcpy(in6p->in6p_icmp6filt, &fil, |
| 2682 | sizeof(struct icmp6_filter)); |
| 2683 | error = 0; |
| 2684 | break; |
| 2685 | } |
| 2686 | |
| 2687 | default: |
| 2688 | error = ENOPROTOOPT; |
| 2689 | break; |
| 2690 | } |
| 2691 | break; |
| 2692 | |
| 2693 | case PRCO_GETOPT: |
| 2694 | switch (sopt->sopt_name) { |
| 2695 | case ICMP6_FILTER: |
| 2696 | { |
| 2697 | if (in6p->in6p_icmp6filt == NULL) { |
| 2698 | error = EINVAL; |
| 2699 | break; |
| 2700 | } |
| 2701 | error = sockopt_set(sopt, in6p->in6p_icmp6filt, |
| 2702 | sizeof(struct icmp6_filter)); |
| 2703 | break; |
| 2704 | } |
| 2705 | |
| 2706 | default: |
| 2707 | error = ENOPROTOOPT; |
| 2708 | break; |
| 2709 | } |
| 2710 | break; |
| 2711 | } |
| 2712 | |
| 2713 | return (error); |
| 2714 | } |
| 2715 | |
| 2716 | /* |
| 2717 | * Perform rate limit check. |
| 2718 | * Returns 0 if it is okay to send the icmp6 packet. |
| 2719 | * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate |
| 2720 | * limitation. |
| 2721 | * |
| 2722 | * XXX per-destination/type check necessary? |
| 2723 | */ |
| 2724 | static int |
| 2725 | icmp6_ratelimit( |
| 2726 | const struct in6_addr *dst, /* not used at this moment */ |
| 2727 | const int type, /* not used at this moment */ |
| 2728 | const int code) /* not used at this moment */ |
| 2729 | { |
| 2730 | int ret; |
| 2731 | |
| 2732 | ret = 0; /* okay to send */ |
| 2733 | |
| 2734 | /* PPS limit */ |
| 2735 | if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, |
| 2736 | icmp6errppslim)) { |
| 2737 | /* The packet is subject to rate limit */ |
| 2738 | ret++; |
| 2739 | } |
| 2740 | |
| 2741 | return ret; |
| 2742 | } |
| 2743 | |
| 2744 | static struct rtentry * |
| 2745 | icmp6_mtudisc_clone(struct sockaddr *dst) |
| 2746 | { |
| 2747 | struct rtentry *rt; |
| 2748 | int error; |
| 2749 | |
| 2750 | rt = rtalloc1(dst, 1); |
| 2751 | if (rt == 0) |
| 2752 | return NULL; |
| 2753 | |
| 2754 | /* If we didn't get a host route, allocate one */ |
| 2755 | if ((rt->rt_flags & RTF_HOST) == 0) { |
| 2756 | struct rtentry *nrt; |
| 2757 | |
| 2758 | error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, |
| 2759 | RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); |
| 2760 | if (error) { |
| 2761 | rtfree(rt); |
| 2762 | return NULL; |
| 2763 | } |
| 2764 | nrt->rt_rmx = rt->rt_rmx; |
| 2765 | rtfree(rt); |
| 2766 | rt = nrt; |
| 2767 | } |
| 2768 | error = rt_timer_add(rt, icmp6_mtudisc_timeout, |
| 2769 | icmp6_mtudisc_timeout_q); |
| 2770 | if (error) { |
| 2771 | rtfree(rt); |
| 2772 | return NULL; |
| 2773 | } |
| 2774 | |
| 2775 | return rt; /* caller need to call rtfree() */ |
| 2776 | } |
| 2777 | |
| 2778 | static void |
| 2779 | icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) |
| 2780 | { |
| 2781 | |
| 2782 | KASSERT(rt != NULL); |
| 2783 | rt_assert_referenced(rt); |
| 2784 | |
| 2785 | if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == |
| 2786 | (RTF_DYNAMIC | RTF_HOST)) { |
| 2787 | rtrequest(RTM_DELETE, rt_getkey(rt), |
| 2788 | rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); |
| 2789 | } else { |
| 2790 | if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) |
| 2791 | rt->rt_rmx.rmx_mtu = 0; |
| 2792 | } |
| 2793 | } |
| 2794 | |
| 2795 | static void |
| 2796 | icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) |
| 2797 | { |
| 2798 | |
| 2799 | KASSERT(rt != NULL); |
| 2800 | rt_assert_referenced(rt); |
| 2801 | |
| 2802 | if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == |
| 2803 | (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { |
| 2804 | rtrequest(RTM_DELETE, rt_getkey(rt), |
| 2805 | rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); |
| 2806 | } |
| 2807 | } |
| 2808 | |
| 2809 | /* |
| 2810 | * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? |
| 2811 | */ |
| 2812 | static int |
| 2813 | sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) |
| 2814 | { |
| 2815 | (void)&name; |
| 2816 | (void)&l; |
| 2817 | (void)&oname; |
| 2818 | |
| 2819 | if (namelen != 0) |
| 2820 | return (EINVAL); |
| 2821 | |
| 2822 | return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, |
| 2823 | /*XXXUNCONST*/ |
| 2824 | __UNCONST(newp), newlen)); |
| 2825 | } |
| 2826 | |
| 2827 | static int |
| 2828 | sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) |
| 2829 | { |
| 2830 | |
| 2831 | return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); |
| 2832 | } |
| 2833 | |
| 2834 | static int |
| 2835 | sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) |
| 2836 | { |
| 2837 | int error, tmp; |
| 2838 | struct sysctlnode node; |
| 2839 | |
| 2840 | node = *rnode; |
| 2841 | node.sysctl_data = &tmp; |
| 2842 | tmp = icmp6_redirtimeout; |
| 2843 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
| 2844 | if (error || newp == NULL) |
| 2845 | return error; |
| 2846 | if (tmp < 0) |
| 2847 | return EINVAL; |
| 2848 | icmp6_redirtimeout = tmp; |
| 2849 | |
| 2850 | if (icmp6_redirect_timeout_q != NULL) { |
| 2851 | if (icmp6_redirtimeout == 0) { |
| 2852 | rt_timer_queue_destroy(icmp6_redirect_timeout_q); |
| 2853 | } else { |
| 2854 | rt_timer_queue_change(icmp6_redirect_timeout_q, |
| 2855 | icmp6_redirtimeout); |
| 2856 | } |
| 2857 | } else if (icmp6_redirtimeout > 0) { |
| 2858 | icmp6_redirect_timeout_q = |
| 2859 | rt_timer_queue_create(icmp6_redirtimeout); |
| 2860 | } |
| 2861 | |
| 2862 | return 0; |
| 2863 | } |
| 2864 | |
| 2865 | static void |
| 2866 | sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) |
| 2867 | { |
| 2868 | extern int nd6_maxqueuelen; /* defined in nd6.c */ |
| 2869 | |
| 2870 | sysctl_createv(clog, 0, NULL, NULL, |
| 2871 | CTLFLAG_PERMANENT, |
| 2872 | CTLTYPE_NODE, "inet6" , NULL, |
| 2873 | NULL, 0, NULL, 0, |
| 2874 | CTL_NET, PF_INET6, CTL_EOL); |
| 2875 | sysctl_createv(clog, 0, NULL, NULL, |
| 2876 | CTLFLAG_PERMANENT, |
| 2877 | CTLTYPE_NODE, "icmp6" , |
| 2878 | SYSCTL_DESCR("ICMPv6 related settings" ), |
| 2879 | NULL, 0, NULL, 0, |
| 2880 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); |
| 2881 | |
| 2882 | sysctl_createv(clog, 0, NULL, NULL, |
| 2883 | CTLFLAG_PERMANENT, |
| 2884 | CTLTYPE_STRUCT, "stats" , |
| 2885 | SYSCTL_DESCR("ICMPv6 transmission statistics" ), |
| 2886 | sysctl_net_inet6_icmp6_stats, 0, NULL, 0, |
| 2887 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2888 | ICMPV6CTL_STATS, CTL_EOL); |
| 2889 | sysctl_createv(clog, 0, NULL, NULL, |
| 2890 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2891 | CTLTYPE_INT, "rediraccept" , |
| 2892 | SYSCTL_DESCR("Accept and process redirect messages" ), |
| 2893 | NULL, 0, &icmp6_rediraccept, 0, |
| 2894 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2895 | ICMPV6CTL_REDIRACCEPT, CTL_EOL); |
| 2896 | sysctl_createv(clog, 0, NULL, NULL, |
| 2897 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2898 | CTLTYPE_INT, "redirtimeout" , |
| 2899 | SYSCTL_DESCR("Redirect generated route lifetime" ), |
| 2900 | sysctl_net_inet6_icmp6_redirtimeout, 0, |
| 2901 | &icmp6_redirtimeout, 0, |
| 2902 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2903 | ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); |
| 2904 | #if 0 /* obsoleted */ |
| 2905 | sysctl_createv(clog, 0, NULL, NULL, |
| 2906 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2907 | CTLTYPE_INT, "errratelimit" , NULL, |
| 2908 | NULL, 0, &icmp6_errratelimit, 0, |
| 2909 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2910 | ICMPV6CTL_ERRRATELIMIT, CTL_EOL); |
| 2911 | #endif |
| 2912 | sysctl_createv(clog, 0, NULL, NULL, |
| 2913 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2914 | CTLTYPE_INT, "nd6_prune" , |
| 2915 | SYSCTL_DESCR("Neighbor discovery prune interval" ), |
| 2916 | NULL, 0, &nd6_prune, 0, |
| 2917 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2918 | ICMPV6CTL_ND6_PRUNE, CTL_EOL); |
| 2919 | sysctl_createv(clog, 0, NULL, NULL, |
| 2920 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2921 | CTLTYPE_INT, "nd6_delay" , |
| 2922 | SYSCTL_DESCR("First probe delay time" ), |
| 2923 | NULL, 0, &nd6_delay, 0, |
| 2924 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2925 | ICMPV6CTL_ND6_DELAY, CTL_EOL); |
| 2926 | sysctl_createv(clog, 0, NULL, NULL, |
| 2927 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2928 | CTLTYPE_INT, "nd6_umaxtries" , |
| 2929 | SYSCTL_DESCR("Number of unicast discovery attempts" ), |
| 2930 | NULL, 0, &nd6_umaxtries, 0, |
| 2931 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2932 | ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); |
| 2933 | sysctl_createv(clog, 0, NULL, NULL, |
| 2934 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2935 | CTLTYPE_INT, "nd6_mmaxtries" , |
| 2936 | SYSCTL_DESCR("Number of multicast discovery attempts" ), |
| 2937 | NULL, 0, &nd6_mmaxtries, 0, |
| 2938 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2939 | ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); |
| 2940 | sysctl_createv(clog, 0, NULL, NULL, |
| 2941 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2942 | CTLTYPE_INT, "nd6_useloopback" , |
| 2943 | SYSCTL_DESCR("Use loopback interface for local traffic" ), |
| 2944 | NULL, 0, &nd6_useloopback, 0, |
| 2945 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2946 | ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); |
| 2947 | #if 0 /* obsoleted */ |
| 2948 | sysctl_createv(clog, 0, NULL, NULL, |
| 2949 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2950 | CTLTYPE_INT, "nd6_proxyall" , NULL, |
| 2951 | NULL, 0, &nd6_proxyall, 0, |
| 2952 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2953 | ICMPV6CTL_ND6_PROXYALL, CTL_EOL); |
| 2954 | #endif |
| 2955 | sysctl_createv(clog, 0, NULL, NULL, |
| 2956 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2957 | CTLTYPE_INT, "nodeinfo" , |
| 2958 | SYSCTL_DESCR("Respond to node information requests" ), |
| 2959 | NULL, 0, &icmp6_nodeinfo, 0, |
| 2960 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2961 | ICMPV6CTL_NODEINFO, CTL_EOL); |
| 2962 | sysctl_createv(clog, 0, NULL, NULL, |
| 2963 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2964 | CTLTYPE_INT, "errppslimit" , |
| 2965 | SYSCTL_DESCR("Maximum ICMP errors sent per second" ), |
| 2966 | NULL, 0, &icmp6errppslim, 0, |
| 2967 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2968 | ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); |
| 2969 | sysctl_createv(clog, 0, NULL, NULL, |
| 2970 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2971 | CTLTYPE_INT, "nd6_maxnudhint" , |
| 2972 | SYSCTL_DESCR("Maximum neighbor unreachable hint count" ), |
| 2973 | NULL, 0, &nd6_maxnudhint, 0, |
| 2974 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2975 | ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); |
| 2976 | sysctl_createv(clog, 0, NULL, NULL, |
| 2977 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2978 | CTLTYPE_INT, "mtudisc_hiwat" , |
| 2979 | SYSCTL_DESCR("Low mark on MTU Discovery route timers" ), |
| 2980 | NULL, 0, &icmp6_mtudisc_hiwat, 0, |
| 2981 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2982 | ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); |
| 2983 | sysctl_createv(clog, 0, NULL, NULL, |
| 2984 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2985 | CTLTYPE_INT, "mtudisc_lowat" , |
| 2986 | SYSCTL_DESCR("Low mark on MTU Discovery route timers" ), |
| 2987 | NULL, 0, &icmp6_mtudisc_lowat, 0, |
| 2988 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2989 | ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); |
| 2990 | sysctl_createv(clog, 0, NULL, NULL, |
| 2991 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 2992 | CTLTYPE_INT, "nd6_debug" , |
| 2993 | SYSCTL_DESCR("Enable neighbor discovery debug output" ), |
| 2994 | NULL, 0, &nd6_debug, 0, |
| 2995 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 2996 | ICMPV6CTL_ND6_DEBUG, CTL_EOL); |
| 2997 | sysctl_createv(clog, 0, NULL, NULL, |
| 2998 | CTLFLAG_PERMANENT, |
| 2999 | CTLTYPE_STRUCT, "nd6_drlist" , |
| 3000 | SYSCTL_DESCR("Default router list" ), |
| 3001 | sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, |
| 3002 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 3003 | ICMPV6CTL_ND6_DRLIST, CTL_EOL); |
| 3004 | sysctl_createv(clog, 0, NULL, NULL, |
| 3005 | CTLFLAG_PERMANENT, |
| 3006 | CTLTYPE_STRUCT, "nd6_prlist" , |
| 3007 | SYSCTL_DESCR("Prefix list" ), |
| 3008 | sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, |
| 3009 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 3010 | ICMPV6CTL_ND6_PRLIST, CTL_EOL); |
| 3011 | sysctl_createv(clog, 0, NULL, NULL, |
| 3012 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 3013 | CTLTYPE_INT, "maxqueuelen" , |
| 3014 | SYSCTL_DESCR("max packet queue len for a unresolved ND" ), |
| 3015 | NULL, 1, &nd6_maxqueuelen, 0, |
| 3016 | CTL_NET, PF_INET6, IPPROTO_ICMPV6, |
| 3017 | ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); |
| 3018 | } |
| 3019 | |
| 3020 | void |
| 3021 | icmp6_statinc(u_int stat) |
| 3022 | { |
| 3023 | |
| 3024 | KASSERT(stat < ICMP6_NSTATS); |
| 3025 | ICMP6_STATINC(stat); |
| 3026 | } |
| 3027 | |