| 1 | /* $NetBSD: in6_ifattach.c,v 1.106 2016/10/18 02:45:41 ozaki-r Exp $ */ |
| 2 | /* $KAME: in6_ifattach.c,v 1.124 2001/07/18 08:32:51 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 | #include <sys/cdefs.h> |
| 34 | __KERNEL_RCSID(0, "$NetBSD: in6_ifattach.c,v 1.106 2016/10/18 02:45:41 ozaki-r Exp $" ); |
| 35 | |
| 36 | #include <sys/param.h> |
| 37 | #include <sys/systm.h> |
| 38 | #include <sys/kmem.h> |
| 39 | #include <sys/socket.h> |
| 40 | #include <sys/sockio.h> |
| 41 | #include <sys/kernel.h> |
| 42 | #include <sys/syslog.h> |
| 43 | #include <sys/md5.h> |
| 44 | #include <sys/socketvar.h> |
| 45 | #include <sys/cprng.h> |
| 46 | |
| 47 | #include <net/if.h> |
| 48 | #include <net/if_dl.h> |
| 49 | #include <net/if_types.h> |
| 50 | #include <net/route.h> |
| 51 | |
| 52 | #include <netinet/in.h> |
| 53 | #include <netinet/in_var.h> |
| 54 | |
| 55 | #include <netinet/ip6.h> |
| 56 | #include <netinet6/in6_ifattach.h> |
| 57 | #include <netinet6/ip6_var.h> |
| 58 | #include <netinet6/nd6.h> |
| 59 | #include <netinet6/ip6_mroute.h> |
| 60 | #include <netinet6/scope6_var.h> |
| 61 | |
| 62 | #include <net/net_osdep.h> |
| 63 | |
| 64 | unsigned long in6_maxmtu = 0; |
| 65 | |
| 66 | int ip6_auto_linklocal = 1; /* enable by default */ |
| 67 | |
| 68 | callout_t in6_tmpaddrtimer_ch; |
| 69 | |
| 70 | |
| 71 | #if 0 |
| 72 | static int get_hostid_ifid(struct ifnet *, struct in6_addr *); |
| 73 | #endif |
| 74 | static int get_rand_ifid(struct in6_addr *); |
| 75 | static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); |
| 76 | static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); |
| 77 | static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); |
| 78 | static int in6_ifattach_loopback(struct ifnet *); |
| 79 | |
| 80 | #define EUI64_GBIT 0x01 |
| 81 | #define EUI64_UBIT 0x02 |
| 82 | #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (/*CONSTCOND*/ 0) |
| 83 | #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) |
| 84 | #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) |
| 85 | #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) |
| 86 | #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) |
| 87 | |
| 88 | #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) |
| 89 | #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) |
| 90 | |
| 91 | #define GEN_TEMPID_RETRY_MAX 5 |
| 92 | |
| 93 | #if 0 |
| 94 | /* |
| 95 | * Generate a last-resort interface identifier from hostid. |
| 96 | * works only for certain architectures (like sparc). |
| 97 | * also, using hostid itself may constitute a privacy threat, much worse |
| 98 | * than MAC addresses (hostids are used for software licensing). |
| 99 | * maybe we should use MD5(hostid) instead. |
| 100 | * |
| 101 | * in6 - upper 64bits are preserved |
| 102 | */ |
| 103 | static int |
| 104 | get_hostid_ifid(struct ifnet *ifp, struct in6_addr *in6) |
| 105 | { |
| 106 | int off, len; |
| 107 | static const uint8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 108 | static const uint8_t allone[8] = |
| 109 | { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
| 110 | |
| 111 | if (!hostid) |
| 112 | return -1; |
| 113 | |
| 114 | /* get up to 8 bytes from the hostid field - should we get */ |
| 115 | len = (sizeof(hostid) > 8) ? 8 : sizeof(hostid); |
| 116 | off = sizeof(*in6) - len; |
| 117 | memcpy(&in6->s6_addr[off], &hostid, len); |
| 118 | |
| 119 | /* make sure we do not return anything bogus */ |
| 120 | if (memcmp(&in6->s6_addr[8], allzero, sizeof(allzero))) |
| 121 | return -1; |
| 122 | if (memcmp(&in6->s6_addr[8], allone, sizeof(allone))) |
| 123 | return -1; |
| 124 | |
| 125 | /* make sure to set "u" bit to local, and "g" bit to individual. */ |
| 126 | in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ |
| 127 | in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ |
| 128 | |
| 129 | /* convert EUI64 into IPv6 interface identifier */ |
| 130 | EUI64_TO_IFID(in6); |
| 131 | |
| 132 | return 0; |
| 133 | } |
| 134 | #endif |
| 135 | |
| 136 | /* |
| 137 | * Generate a last-resort interface identifier, when the machine has no |
| 138 | * IEEE802/EUI64 address sources. |
| 139 | * The goal here is to get an interface identifier that is |
| 140 | * (1) random enough and (2) does not change across reboot. |
| 141 | * We currently use MD5(hostname) for it. |
| 142 | */ |
| 143 | static int |
| 144 | get_rand_ifid(struct in6_addr *in6) /* upper 64bits are preserved */ |
| 145 | { |
| 146 | MD5_CTX ctxt; |
| 147 | u_int8_t digest[16]; |
| 148 | |
| 149 | #if 0 |
| 150 | /* we need at least several letters as seed for ifid */ |
| 151 | if (hostnamelen < 3) |
| 152 | return -1; |
| 153 | #endif |
| 154 | |
| 155 | /* generate 8 bytes of pseudo-random value. */ |
| 156 | memset(&ctxt, 0, sizeof(ctxt)); |
| 157 | MD5Init(&ctxt); |
| 158 | MD5Update(&ctxt, (u_char *)hostname, hostnamelen); |
| 159 | MD5Final(digest, &ctxt); |
| 160 | |
| 161 | /* assumes sizeof(digest) > sizeof(ifid) */ |
| 162 | memcpy(&in6->s6_addr[8], digest, 8); |
| 163 | |
| 164 | /* make sure to set "u" bit to local, and "g" bit to individual. */ |
| 165 | in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ |
| 166 | in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ |
| 167 | |
| 168 | /* convert EUI64 into IPv6 interface identifier */ |
| 169 | EUI64_TO_IFID(in6); |
| 170 | |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | static int |
| 175 | generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) |
| 176 | { |
| 177 | MD5_CTX ctxt; |
| 178 | u_int8_t seed[16], digest[16], nullbuf[8]; |
| 179 | /* |
| 180 | * interface ID for subnet anycast addresses. |
| 181 | * XXX: we assume the unicast address range that requires IDs |
| 182 | * in EUI-64 format. |
| 183 | */ |
| 184 | static const uint8_t anycast_id[8] = { 0xfd, 0xff, 0xff, 0xff, |
| 185 | 0xff, 0xff, 0xff, 0x80 }; |
| 186 | static const uint8_t isatap_id[4] = { 0x00, 0x00, 0x5e, 0xfe }; |
| 187 | int badid, retry = 0; |
| 188 | |
| 189 | /* If there's no hisotry, start with a random seed. */ |
| 190 | memset(nullbuf, 0, sizeof(nullbuf)); |
| 191 | if (memcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { |
| 192 | cprng_fast(seed, sizeof(seed)); |
| 193 | } else |
| 194 | memcpy(seed, seed0, 8); |
| 195 | |
| 196 | /* copy the right-most 64-bits of the given address */ |
| 197 | /* XXX assumption on the size of IFID */ |
| 198 | memcpy(&seed[8], seed1, 8); |
| 199 | |
| 200 | again: |
| 201 | /* for debugging purposes only */ |
| 202 | #if 0 |
| 203 | { |
| 204 | int i; |
| 205 | |
| 206 | printf("generate_tmp_ifid: new randomized ID from: " ); |
| 207 | for (i = 0; i < 16; i++) |
| 208 | printf("%02x" , seed[i]); |
| 209 | printf(" " ); |
| 210 | } |
| 211 | #endif |
| 212 | |
| 213 | /* generate 16 bytes of pseudo-random value. */ |
| 214 | memset(&ctxt, 0, sizeof(ctxt)); |
| 215 | MD5Init(&ctxt); |
| 216 | MD5Update(&ctxt, seed, sizeof(seed)); |
| 217 | MD5Final(digest, &ctxt); |
| 218 | |
| 219 | /* |
| 220 | * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (3) |
| 221 | * Take the left-most 64-bits of the MD5 digest and set bit 6 (the |
| 222 | * left-most bit is numbered 0) to zero. |
| 223 | */ |
| 224 | memcpy(ret, digest, 8); |
| 225 | ret[0] &= ~EUI64_UBIT; |
| 226 | |
| 227 | /* |
| 228 | * Reject inappropriate identifiers according to |
| 229 | * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (4) |
| 230 | * At this moment, we reject following cases: |
| 231 | * - all 0 identifier |
| 232 | * - identifiers that conflict with reserved subnet anycast addresses, |
| 233 | * which are defined in RFC 2526. |
| 234 | * - identifiers that conflict with ISATAP addresses |
| 235 | * - identifiers used in our own addresses |
| 236 | */ |
| 237 | badid = 0; |
| 238 | if (memcmp(nullbuf, ret, sizeof(nullbuf)) == 0) |
| 239 | badid = 1; |
| 240 | else if (memcmp(anycast_id, ret, 7) == 0 && |
| 241 | (anycast_id[7] & ret[7]) == anycast_id[7]) { |
| 242 | badid = 1; |
| 243 | } else if (memcmp(isatap_id, ret, sizeof(isatap_id)) == 0) |
| 244 | badid = 1; |
| 245 | else { |
| 246 | struct in6_ifaddr *ia; |
| 247 | int s = pserialize_read_enter(); |
| 248 | |
| 249 | IN6_ADDRLIST_READER_FOREACH(ia) { |
| 250 | if (!memcmp(&ia->ia_addr.sin6_addr.s6_addr[8], |
| 251 | ret, 8)) { |
| 252 | badid = 1; |
| 253 | break; |
| 254 | } |
| 255 | } |
| 256 | pserialize_read_exit(s); |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * In the event that an unacceptable identifier has been generated, |
| 261 | * restart the process, using the right-most 64 bits of the MD5 digest |
| 262 | * obtained in place of the history value. |
| 263 | */ |
| 264 | if (badid) { |
| 265 | /* for debugging purposes only */ |
| 266 | #if 0 |
| 267 | { |
| 268 | int i; |
| 269 | |
| 270 | printf("unacceptable random ID: " ); |
| 271 | for (i = 0; i < 16; i++) |
| 272 | printf("%02x" , digest[i]); |
| 273 | printf("\n" ); |
| 274 | } |
| 275 | #endif |
| 276 | |
| 277 | if (++retry < GEN_TEMPID_RETRY_MAX) { |
| 278 | memcpy(seed, &digest[8], 8); |
| 279 | goto again; |
| 280 | } else { |
| 281 | /* |
| 282 | * We're so unlucky. Give up for now, and return |
| 283 | * all 0 IDs to tell the caller not to make a |
| 284 | * temporary address. |
| 285 | */ |
| 286 | nd6log(LOG_NOTICE, "never found a good ID\n" ); |
| 287 | memset(ret, 0, 8); |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (6) |
| 293 | * Take the rightmost 64-bits of the MD5 digest and save them in |
| 294 | * stable storage as the history value to be used in the next |
| 295 | * iteration of the algorithm. |
| 296 | */ |
| 297 | memcpy(seed0, &digest[8], 8); |
| 298 | |
| 299 | /* for debugging purposes only */ |
| 300 | #if 0 |
| 301 | { |
| 302 | int i; |
| 303 | |
| 304 | printf("to: " ); |
| 305 | for (i = 0; i < 16; i++) |
| 306 | printf("%02x" , digest[i]); |
| 307 | printf("\n" ); |
| 308 | } |
| 309 | #endif |
| 310 | |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | /* |
| 315 | * Get interface identifier for the specified interface. |
| 316 | * |
| 317 | * in6 - upper 64bits are preserved |
| 318 | */ |
| 319 | int |
| 320 | in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) |
| 321 | { |
| 322 | struct ifaddr *ifa; |
| 323 | const struct sockaddr_dl *sdl = NULL; |
| 324 | const char *addr = NULL; /* XXX gcc 4.8 -Werror=maybe-uninitialized */ |
| 325 | size_t addrlen = 0; /* XXX gcc 4.8 -Werror=maybe-uninitialized */ |
| 326 | static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 327 | static u_int8_t allone[8] = |
| 328 | { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
| 329 | int s; |
| 330 | |
| 331 | s = pserialize_read_enter(); |
| 332 | IFADDR_READER_FOREACH(ifa, ifp) { |
| 333 | const struct sockaddr_dl *tsdl; |
| 334 | if (ifa->ifa_addr->sa_family != AF_LINK) |
| 335 | continue; |
| 336 | tsdl = satocsdl(ifa->ifa_addr); |
| 337 | if (tsdl == NULL || tsdl->sdl_alen == 0) |
| 338 | continue; |
| 339 | if (sdl == NULL || ifa == ifp->if_dl || ifa == ifp->if_hwdl) { |
| 340 | sdl = tsdl; |
| 341 | addr = CLLADDR(sdl); |
| 342 | addrlen = sdl->sdl_alen; |
| 343 | } |
| 344 | if (ifa == ifp->if_hwdl) |
| 345 | break; |
| 346 | } |
| 347 | pserialize_read_exit(s); |
| 348 | |
| 349 | if (sdl == NULL) |
| 350 | return -1; |
| 351 | |
| 352 | switch (ifp->if_type) { |
| 353 | case IFT_IEEE1394: |
| 354 | case IFT_IEEE80211: |
| 355 | /* IEEE1394 uses 16byte length address starting with EUI64 */ |
| 356 | if (addrlen > 8) |
| 357 | addrlen = 8; |
| 358 | break; |
| 359 | default: |
| 360 | break; |
| 361 | } |
| 362 | |
| 363 | /* get EUI64 */ |
| 364 | switch (ifp->if_type) { |
| 365 | /* IEEE802/EUI64 cases - what others? */ |
| 366 | case IFT_ETHER: |
| 367 | case IFT_FDDI: |
| 368 | case IFT_ATM: |
| 369 | case IFT_IEEE1394: |
| 370 | case IFT_IEEE80211: |
| 371 | /* look at IEEE802/EUI64 only */ |
| 372 | if (addrlen != 8 && addrlen != 6) |
| 373 | return -1; |
| 374 | |
| 375 | /* |
| 376 | * check for invalid MAC address - on bsdi, we see it a lot |
| 377 | * since wildboar configures all-zero MAC on pccard before |
| 378 | * card insertion. |
| 379 | */ |
| 380 | if (memcmp(addr, allzero, addrlen) == 0) |
| 381 | return -1; |
| 382 | if (memcmp(addr, allone, addrlen) == 0) |
| 383 | return -1; |
| 384 | |
| 385 | /* make EUI64 address */ |
| 386 | if (addrlen == 8) |
| 387 | memcpy(&in6->s6_addr[8], addr, 8); |
| 388 | else if (addrlen == 6) { |
| 389 | in6->s6_addr[8] = addr[0]; |
| 390 | in6->s6_addr[9] = addr[1]; |
| 391 | in6->s6_addr[10] = addr[2]; |
| 392 | in6->s6_addr[11] = 0xff; |
| 393 | in6->s6_addr[12] = 0xfe; |
| 394 | in6->s6_addr[13] = addr[3]; |
| 395 | in6->s6_addr[14] = addr[4]; |
| 396 | in6->s6_addr[15] = addr[5]; |
| 397 | } |
| 398 | break; |
| 399 | |
| 400 | case IFT_ARCNET: |
| 401 | if (addrlen != 1) |
| 402 | return -1; |
| 403 | if (!addr[0]) |
| 404 | return -1; |
| 405 | |
| 406 | memset(&in6->s6_addr[8], 0, 8); |
| 407 | in6->s6_addr[15] = addr[0]; |
| 408 | |
| 409 | /* |
| 410 | * due to insufficient bitwidth, we mark it local. |
| 411 | */ |
| 412 | in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ |
| 413 | in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ |
| 414 | break; |
| 415 | |
| 416 | case IFT_GIF: |
| 417 | #ifdef IFT_STF |
| 418 | case IFT_STF: |
| 419 | #endif |
| 420 | /* |
| 421 | * RFC2893 says: "SHOULD use IPv4 address as ifid source". |
| 422 | * however, IPv4 address is not very suitable as unique |
| 423 | * identifier source (can be renumbered). |
| 424 | * we don't do this. |
| 425 | */ |
| 426 | return -1; |
| 427 | |
| 428 | default: |
| 429 | return -1; |
| 430 | } |
| 431 | |
| 432 | /* sanity check: g bit must not indicate "group" */ |
| 433 | if (EUI64_GROUP(in6)) |
| 434 | return -1; |
| 435 | |
| 436 | /* convert EUI64 into IPv6 interface identifier */ |
| 437 | EUI64_TO_IFID(in6); |
| 438 | |
| 439 | /* |
| 440 | * sanity check: ifid must not be all zero, avoid conflict with |
| 441 | * subnet router anycast |
| 442 | */ |
| 443 | if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && |
| 444 | memcmp(&in6->s6_addr[9], allzero, 7) == 0) { |
| 445 | return -1; |
| 446 | } |
| 447 | |
| 448 | return 0; |
| 449 | } |
| 450 | |
| 451 | /* |
| 452 | * Get interface identifier for the specified interface. If it is not |
| 453 | * available on ifp0, borrow interface identifier from other information |
| 454 | * sources. |
| 455 | * |
| 456 | * altifp - secondary EUI64 source |
| 457 | */ |
| 458 | static int |
| 459 | get_ifid(struct ifnet *ifp0, struct ifnet *altifp, |
| 460 | struct in6_addr *in6) |
| 461 | { |
| 462 | struct ifnet *ifp; |
| 463 | int s; |
| 464 | |
| 465 | /* first, try to get it from the interface itself */ |
| 466 | if (in6_get_hw_ifid(ifp0, in6) == 0) { |
| 467 | nd6log(LOG_DEBUG, "%s: got interface identifier from itself\n" , |
| 468 | if_name(ifp0)); |
| 469 | goto success; |
| 470 | } |
| 471 | |
| 472 | /* try secondary EUI64 source. this basically is for ATM PVC */ |
| 473 | if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { |
| 474 | nd6log(LOG_DEBUG, "%s: got interface identifier from %s\n" , |
| 475 | if_name(ifp0), if_name(altifp)); |
| 476 | goto success; |
| 477 | } |
| 478 | |
| 479 | /* next, try to get it from some other hardware interface */ |
| 480 | s = pserialize_read_enter(); |
| 481 | IFNET_READER_FOREACH(ifp) { |
| 482 | if (ifp == ifp0) |
| 483 | continue; |
| 484 | if (in6_get_hw_ifid(ifp, in6) != 0) |
| 485 | continue; |
| 486 | |
| 487 | /* |
| 488 | * to borrow ifid from other interface, ifid needs to be |
| 489 | * globally unique |
| 490 | */ |
| 491 | if (IFID_UNIVERSAL(in6)) { |
| 492 | nd6log(LOG_DEBUG, |
| 493 | "%s: borrow interface identifier from %s\n" , |
| 494 | if_name(ifp0), if_name(ifp)); |
| 495 | pserialize_read_exit(s); |
| 496 | goto success; |
| 497 | } |
| 498 | } |
| 499 | pserialize_read_exit(s); |
| 500 | |
| 501 | #if 0 |
| 502 | /* get from hostid - only for certain architectures */ |
| 503 | if (get_hostid_ifid(ifp, in6) == 0) { |
| 504 | nd6log(LOG_DEBUG, |
| 505 | "%s: interface identifier generated by hostid\n" , |
| 506 | if_name(ifp0)); |
| 507 | goto success; |
| 508 | } |
| 509 | #endif |
| 510 | |
| 511 | /* last resort: get from random number source */ |
| 512 | if (get_rand_ifid(in6) == 0) { |
| 513 | nd6log(LOG_DEBUG, |
| 514 | "%s: interface identifier generated by random number\n" , |
| 515 | if_name(ifp0)); |
| 516 | goto success; |
| 517 | } |
| 518 | |
| 519 | printf("%s: failed to get interface identifier\n" , if_name(ifp0)); |
| 520 | return -1; |
| 521 | |
| 522 | success: |
| 523 | nd6log(LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n" , |
| 524 | if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], |
| 525 | in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], |
| 526 | in6->s6_addr[14], in6->s6_addr[15]); |
| 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | /* |
| 531 | * altifp - secondary EUI64 source |
| 532 | */ |
| 533 | |
| 534 | static int |
| 535 | in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) |
| 536 | { |
| 537 | struct in6_aliasreq ifra; |
| 538 | int error; |
| 539 | |
| 540 | /* |
| 541 | * configure link-local address. |
| 542 | */ |
| 543 | memset(&ifra, 0, sizeof(ifra)); |
| 544 | |
| 545 | /* |
| 546 | * in6_update_ifa() does not use ifra_name, but we accurately set it |
| 547 | * for safety. |
| 548 | */ |
| 549 | strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); |
| 550 | |
| 551 | ifra.ifra_addr.sin6_family = AF_INET6; |
| 552 | ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); |
| 553 | ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); |
| 554 | ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; |
| 555 | if ((ifp->if_flags & IFF_LOOPBACK) != 0) { |
| 556 | ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; |
| 557 | ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); |
| 558 | } else { |
| 559 | if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { |
| 560 | nd6log(LOG_ERR, |
| 561 | "%s: no ifid available\n" , if_name(ifp)); |
| 562 | return -1; |
| 563 | } |
| 564 | } |
| 565 | if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) |
| 566 | return -1; |
| 567 | |
| 568 | sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask64, 0, 0, 0); |
| 569 | /* link-local addresses should NEVER expire. */ |
| 570 | ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; |
| 571 | ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; |
| 572 | |
| 573 | /* |
| 574 | * Now call in6_update_ifa() to do a bunch of procedures to configure |
| 575 | * a link-local address. We can set the 3rd argument to NULL, because |
| 576 | * we know there's no other link-local address on the interface |
| 577 | * and therefore we are adding one (instead of updating one). |
| 578 | */ |
| 579 | if ((error = in6_update_ifa(ifp, &ifra, NULL, |
| 580 | IN6_IFAUPDATE_DADDELAY)) != 0) { |
| 581 | /* |
| 582 | * XXX: When the interface does not support IPv6, this call |
| 583 | * would fail in the SIOCINITIFADDR ioctl. I believe the |
| 584 | * notification is rather confusing in this case, so just |
| 585 | * suppress it. (jinmei@kame.net 20010130) |
| 586 | */ |
| 587 | if (error != EAFNOSUPPORT) |
| 588 | nd6log(LOG_NOTICE, |
| 589 | "failed to configure a link-local address on %s " |
| 590 | "(errno=%d)\n" , |
| 591 | if_name(ifp), error); |
| 592 | return -1; |
| 593 | } |
| 594 | |
| 595 | return 0; |
| 596 | } |
| 597 | |
| 598 | /* |
| 599 | * ifp - mut be IFT_LOOP |
| 600 | */ |
| 601 | |
| 602 | static int |
| 603 | in6_ifattach_loopback(struct ifnet *ifp) |
| 604 | { |
| 605 | struct in6_aliasreq ifra; |
| 606 | int error; |
| 607 | |
| 608 | memset(&ifra, 0, sizeof(ifra)); |
| 609 | |
| 610 | /* |
| 611 | * in6_update_ifa() does not use ifra_name, but we accurately set it |
| 612 | * for safety. |
| 613 | */ |
| 614 | strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); |
| 615 | |
| 616 | sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask128, 0, 0, 0); |
| 617 | |
| 618 | /* |
| 619 | * Always initialize ia_dstaddr (= broadcast address) to loopback |
| 620 | * address. Follows IPv4 practice - see in_ifinit(). |
| 621 | */ |
| 622 | sockaddr_in6_init(&ifra.ifra_dstaddr, &in6addr_loopback, 0, 0, 0); |
| 623 | |
| 624 | sockaddr_in6_init(&ifra.ifra_addr, &in6addr_loopback, 0, 0, 0); |
| 625 | |
| 626 | /* the loopback address should NEVER expire. */ |
| 627 | ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; |
| 628 | ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; |
| 629 | |
| 630 | /* we don't need to perform DAD on loopback interfaces. */ |
| 631 | ifra.ifra_flags |= IN6_IFF_NODAD; |
| 632 | |
| 633 | /* |
| 634 | * We are sure that this is a newly assigned address, so we can set |
| 635 | * NULL to the 3rd arg. |
| 636 | */ |
| 637 | if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { |
| 638 | nd6log(LOG_ERR, "failed to configure " |
| 639 | "the loopback address on %s (errno=%d)\n" , |
| 640 | if_name(ifp), error); |
| 641 | return -1; |
| 642 | } |
| 643 | |
| 644 | return 0; |
| 645 | } |
| 646 | |
| 647 | /* |
| 648 | * compute NI group address, based on the current hostname setting. |
| 649 | * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). |
| 650 | * |
| 651 | * when ifp == NULL, the caller is responsible for filling scopeid. |
| 652 | */ |
| 653 | int |
| 654 | in6_nigroup(struct ifnet *ifp, const char *name, int namelen, |
| 655 | struct sockaddr_in6 *sa6) |
| 656 | { |
| 657 | const char *p; |
| 658 | u_int8_t *q; |
| 659 | MD5_CTX ctxt; |
| 660 | u_int8_t digest[16]; |
| 661 | u_int8_t l; |
| 662 | u_int8_t n[64]; /* a single label must not exceed 63 chars */ |
| 663 | |
| 664 | if (!namelen || !name) |
| 665 | return -1; |
| 666 | |
| 667 | p = name; |
| 668 | while (p && *p && *p != '.' && p - name < namelen) |
| 669 | p++; |
| 670 | if (p - name > sizeof(n) - 1) |
| 671 | return -1; /* label too long */ |
| 672 | l = p - name; |
| 673 | strncpy((char *)n, name, l); |
| 674 | n[(int)l] = '\0'; |
| 675 | for (q = n; *q; q++) { |
| 676 | if ('A' <= *q && *q <= 'Z') |
| 677 | *q = *q - 'A' + 'a'; |
| 678 | } |
| 679 | |
| 680 | /* generate 8 bytes of pseudo-random value. */ |
| 681 | memset(&ctxt, 0, sizeof(ctxt)); |
| 682 | MD5Init(&ctxt); |
| 683 | MD5Update(&ctxt, &l, sizeof(l)); |
| 684 | MD5Update(&ctxt, n, l); |
| 685 | MD5Final(digest, &ctxt); |
| 686 | |
| 687 | memset(sa6, 0, sizeof(*sa6)); |
| 688 | sa6->sin6_family = AF_INET6; |
| 689 | sa6->sin6_len = sizeof(*sa6); |
| 690 | sa6->sin6_addr.s6_addr16[0] = htons(0xff02); |
| 691 | sa6->sin6_addr.s6_addr8[11] = 2; |
| 692 | memcpy(&sa6->sin6_addr.s6_addr32[3], digest, |
| 693 | sizeof(sa6->sin6_addr.s6_addr32[3])); |
| 694 | if (in6_setscope(&sa6->sin6_addr, ifp, NULL)) |
| 695 | return -1; /* XXX: should not fail */ |
| 696 | |
| 697 | return 0; |
| 698 | } |
| 699 | |
| 700 | /* |
| 701 | * XXX multiple loopback interface needs more care. for instance, |
| 702 | * nodelocal address needs to be configured onto only one of them. |
| 703 | * XXX multiple link-local address case |
| 704 | * |
| 705 | * altifp - secondary EUI64 source |
| 706 | */ |
| 707 | void |
| 708 | in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) |
| 709 | { |
| 710 | struct in6_ifaddr *ia; |
| 711 | struct in6_addr in6; |
| 712 | |
| 713 | /* some of the interfaces are inherently not IPv6 capable */ |
| 714 | switch (ifp->if_type) { |
| 715 | case IFT_BRIDGE: |
| 716 | #ifdef IFT_PFLOG |
| 717 | case IFT_PFLOG: |
| 718 | #endif |
| 719 | #ifdef IFT_PFSYNC |
| 720 | case IFT_PFSYNC: |
| 721 | #endif |
| 722 | ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; |
| 723 | ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; |
| 724 | return; |
| 725 | } |
| 726 | |
| 727 | /* |
| 728 | * if link mtu is too small, don't try to configure IPv6. |
| 729 | * remember there could be some link-layer that has special |
| 730 | * fragmentation logic. |
| 731 | */ |
| 732 | if (ifp->if_mtu < IPV6_MMTU) { |
| 733 | nd6log(LOG_INFO, "%s has too small MTU, IPv6 not enabled\n" , |
| 734 | if_name(ifp)); |
| 735 | return; |
| 736 | } |
| 737 | |
| 738 | /* create a multicast kludge storage (if we have not had one) */ |
| 739 | in6_createmkludge(ifp); |
| 740 | |
| 741 | /* |
| 742 | * quirks based on interface type |
| 743 | */ |
| 744 | switch (ifp->if_type) { |
| 745 | #ifdef IFT_STF |
| 746 | case IFT_STF: |
| 747 | /* |
| 748 | * 6to4 interface is a very special kind of beast. |
| 749 | * no multicast, no linklocal. RFC2529 specifies how to make |
| 750 | * linklocals for 6to4 interface, but there's no use and |
| 751 | * it is rather harmful to have one. |
| 752 | */ |
| 753 | ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; |
| 754 | return; |
| 755 | #endif |
| 756 | case IFT_CARP: |
| 757 | return; |
| 758 | default: |
| 759 | break; |
| 760 | } |
| 761 | |
| 762 | /* |
| 763 | * usually, we require multicast capability to the interface |
| 764 | */ |
| 765 | if ((ifp->if_flags & IFF_MULTICAST) == 0) { |
| 766 | nd6log(LOG_INFO, |
| 767 | "%s is not multicast capable, IPv6 not enabled\n" , |
| 768 | if_name(ifp)); |
| 769 | return; |
| 770 | } |
| 771 | |
| 772 | /* |
| 773 | * assign loopback address for loopback interface. |
| 774 | * XXX multiple loopback interface case. |
| 775 | */ |
| 776 | if ((ifp->if_flags & IFF_LOOPBACK) != 0) { |
| 777 | int s = pserialize_read_enter(); |
| 778 | in6 = in6addr_loopback; |
| 779 | if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { |
| 780 | if (in6_ifattach_loopback(ifp) != 0) { |
| 781 | pserialize_read_exit(s); |
| 782 | return; |
| 783 | } |
| 784 | } |
| 785 | pserialize_read_exit(s); |
| 786 | } |
| 787 | |
| 788 | /* |
| 789 | * assign a link-local address, if there's none. |
| 790 | */ |
| 791 | if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && |
| 792 | ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { |
| 793 | int s = pserialize_read_enter(); |
| 794 | ia = in6ifa_ifpforlinklocal(ifp, 0); |
| 795 | if (ia == NULL && in6_ifattach_linklocal(ifp, altifp) != 0) { |
| 796 | printf("%s: cannot assign link-local address\n" , |
| 797 | ifp->if_xname); |
| 798 | } |
| 799 | pserialize_read_exit(s); |
| 800 | } |
| 801 | } |
| 802 | |
| 803 | /* |
| 804 | * NOTE: in6_ifdetach() does not support loopback if at this moment. |
| 805 | * We don't need this function in bsdi, because interfaces are never removed |
| 806 | * from the ifnet list in bsdi. |
| 807 | */ |
| 808 | void |
| 809 | in6_ifdetach(struct ifnet *ifp) |
| 810 | { |
| 811 | |
| 812 | /* remove ip6_mrouter stuff */ |
| 813 | ip6_mrouter_detach(ifp); |
| 814 | |
| 815 | /* remove neighbor management table */ |
| 816 | nd6_purge(ifp, NULL); |
| 817 | |
| 818 | /* nuke any of IPv6 addresses we have */ |
| 819 | if_purgeaddrs(ifp, AF_INET6, in6_purgeaddr); |
| 820 | |
| 821 | /* cleanup multicast address kludge table, if there is any */ |
| 822 | in6_purgemkludge(ifp); |
| 823 | |
| 824 | /* |
| 825 | * remove neighbor management table. we call it twice just to make |
| 826 | * sure we nuke everything. maybe we need just one call. |
| 827 | * XXX: since the first call did not release addresses, some prefixes |
| 828 | * might remain. We should call nd6_purge() again to release the |
| 829 | * prefixes after removing all addresses above. |
| 830 | * (Or can we just delay calling nd6_purge until at this point?) |
| 831 | */ |
| 832 | nd6_purge(ifp, NULL); |
| 833 | } |
| 834 | |
| 835 | int |
| 836 | in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, |
| 837 | const u_int8_t *baseid, int generate) |
| 838 | { |
| 839 | u_int8_t nullbuf[8]; |
| 840 | struct nd_ifinfo *ndi = ND_IFINFO(ifp); |
| 841 | |
| 842 | memset(nullbuf, 0, sizeof(nullbuf)); |
| 843 | if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { |
| 844 | /* we've never created a random ID. Create a new one. */ |
| 845 | generate = 1; |
| 846 | } |
| 847 | |
| 848 | if (generate) { |
| 849 | memcpy(ndi->randomseed1, baseid, sizeof(ndi->randomseed1)); |
| 850 | |
| 851 | /* generate_tmp_ifid will update seedn and buf */ |
| 852 | (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, |
| 853 | ndi->randomid); |
| 854 | } |
| 855 | memcpy(retbuf, ndi->randomid, 8); |
| 856 | if (generate && memcmp(retbuf, nullbuf, sizeof(nullbuf)) == 0) { |
| 857 | /* generate_tmp_ifid could not found a good ID. */ |
| 858 | return -1; |
| 859 | } |
| 860 | |
| 861 | return 0; |
| 862 | } |
| 863 | |
| 864 | void |
| 865 | in6_tmpaddrtimer(void *ignored_arg) |
| 866 | { |
| 867 | struct nd_ifinfo *ndi; |
| 868 | u_int8_t nullbuf[8]; |
| 869 | struct ifnet *ifp; |
| 870 | int s; |
| 871 | |
| 872 | mutex_enter(softnet_lock); |
| 873 | KERNEL_LOCK(1, NULL); |
| 874 | |
| 875 | callout_reset(&in6_tmpaddrtimer_ch, |
| 876 | (ip6_temp_preferred_lifetime - ip6_desync_factor - |
| 877 | ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); |
| 878 | |
| 879 | memset(nullbuf, 0, sizeof(nullbuf)); |
| 880 | s = pserialize_read_enter(); |
| 881 | IFNET_READER_FOREACH(ifp) { |
| 882 | ndi = ND_IFINFO(ifp); |
| 883 | if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { |
| 884 | /* |
| 885 | * We've been generating a random ID on this interface. |
| 886 | * Create a new one. |
| 887 | */ |
| 888 | (void)generate_tmp_ifid(ndi->randomseed0, |
| 889 | ndi->randomseed1, ndi->randomid); |
| 890 | } |
| 891 | } |
| 892 | pserialize_read_exit(s); |
| 893 | |
| 894 | KERNEL_UNLOCK_ONE(NULL); |
| 895 | mutex_exit(softnet_lock); |
| 896 | } |
| 897 | |