| 1 | /* $FreeBSD: src/sys/netinet6/in6_ifattach.c,v 1.2.2.6 2002/04/28 05:40:26 suz Exp $ */ |
| 2 | /* $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of the project nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 30 | * SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | #include <sys/param.h> |
| 34 | #include <sys/systm.h> |
| 35 | #include <sys/malloc.h> |
| 36 | #include <sys/socket.h> |
| 37 | #include <sys/sockio.h> |
| 38 | #include <sys/kernel.h> |
| 39 | #include <sys/syslog.h> |
| 40 | #include <sys/md5.h> |
| 41 | #include <sys/thread2.h> |
| 42 | |
| 43 | #include <net/if.h> |
| 44 | #include <net/if_dl.h> |
| 45 | #include <net/if_types.h> |
| 46 | #include <net/route.h> |
| 47 | #include <net/netisr2.h> |
| 48 | #include <net/netmsg2.h> |
| 49 | |
| 50 | #include <netinet/in.h> |
| 51 | #include <netinet/in_var.h> |
| 52 | #include <netinet/if_ether.h> |
| 53 | #include <netinet/in_pcb.h> |
| 54 | #include <netinet/udp_var.h> |
| 55 | |
| 56 | #include <netinet/ip6.h> |
| 57 | #include <netinet6/ip6_var.h> |
| 58 | #include <netinet6/in6_var.h> |
| 59 | #include <netinet6/in6_pcb.h> |
| 60 | #include <netinet6/in6_ifattach.h> |
| 61 | #include <netinet6/nd6.h> |
| 62 | #include <netinet6/scope6_var.h> |
| 63 | |
| 64 | #include <net/net_osdep.h> |
| 65 | |
| 66 | unsigned long in6_maxmtu = 0; |
| 67 | |
| 68 | #ifdef IP6_AUTO_LINKLOCAL |
| 69 | int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; |
| 70 | #else |
| 71 | int ip6_auto_linklocal = 1; /* enable by default */ |
| 72 | #endif |
| 73 | |
| 74 | static struct callout in6_tmpaddrtimer_ch; |
| 75 | static struct netmsg_base in6_tmpaddrtimer_netmsg; |
| 76 | |
| 77 | extern struct inpcbinfo ripcbinfo; |
| 78 | |
| 79 | static int get_rand_ifid (struct in6_addr *); |
| 80 | static int generate_tmp_ifid (u_int8_t *, const u_int8_t *, u_int8_t *); |
| 81 | static int get_hw_ifid (struct ifnet *, struct in6_addr *); |
| 82 | static int get_ifid (struct ifnet *, struct ifnet *, struct in6_addr *); |
| 83 | static int in6_ifattach_linklocal (struct ifnet *, struct ifnet *); |
| 84 | static int in6_ifattach_loopback (struct ifnet *); |
| 85 | |
| 86 | #define EUI64_GBIT 0x01 |
| 87 | #define EUI64_UBIT 0x02 |
| 88 | #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) |
| 89 | #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) |
| 90 | #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) |
| 91 | #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) |
| 92 | #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) |
| 93 | |
| 94 | #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) |
| 95 | #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) |
| 96 | |
| 97 | /* |
| 98 | * Generate a last-resort interface identifier, when the machine has no |
| 99 | * IEEE802/EUI64 address sources. |
| 100 | * The goal here is to get an interface identifier that is |
| 101 | * (1) random enough and (2) does not change across reboot. |
| 102 | * We currently use MD5(hostname) for it. |
| 103 | */ |
| 104 | static int |
| 105 | get_rand_ifid(struct in6_addr *in6) /* upper 64bits are preserved */ |
| 106 | { |
| 107 | MD5_CTX ctxt; |
| 108 | u_int8_t digest[16]; |
| 109 | int hostnamelen = strlen(hostname); |
| 110 | |
| 111 | #if 0 |
| 112 | /* we need at least several letters as seed for ifid */ |
| 113 | if (hostnamelen < 3) |
| 114 | return -1; |
| 115 | #endif |
| 116 | |
| 117 | /* generate 8 bytes of pseudo-random value. */ |
| 118 | bzero(&ctxt, sizeof(ctxt)); |
| 119 | MD5Init(&ctxt); |
| 120 | MD5Update(&ctxt, hostname, hostnamelen); |
| 121 | MD5Final(digest, &ctxt); |
| 122 | |
| 123 | /* assumes sizeof(digest) > sizeof(ifid) */ |
| 124 | bcopy(digest, &in6->s6_addr[8], 8); |
| 125 | |
| 126 | /* make sure to set "u" bit to local, and "g" bit to individual. */ |
| 127 | in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ |
| 128 | in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ |
| 129 | |
| 130 | /* convert EUI64 into IPv6 interface identifier */ |
| 131 | EUI64_TO_IFID(in6); |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | static int |
| 137 | generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) |
| 138 | { |
| 139 | MD5_CTX ctxt; |
| 140 | u_int8_t seed[16], digest[16], nullbuf[8]; |
| 141 | u_int32_t val32; |
| 142 | struct timeval tv; |
| 143 | |
| 144 | /* If there's no hisotry, start with a random seed. */ |
| 145 | bzero(nullbuf, sizeof(nullbuf)); |
| 146 | if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { |
| 147 | int i; |
| 148 | |
| 149 | for (i = 0; i < 2; i++) { |
| 150 | microtime(&tv); |
| 151 | val32 = krandom() ^ tv.tv_usec; |
| 152 | bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); |
| 153 | } |
| 154 | } else { |
| 155 | bcopy(seed0, seed, 8); |
| 156 | } |
| 157 | |
| 158 | /* copy the right-most 64-bits of the given address */ |
| 159 | /* XXX assumption on the size of IFID */ |
| 160 | bcopy(seed1, &seed[8], 8); |
| 161 | |
| 162 | if (0) { /* for debugging purposes only */ |
| 163 | int i; |
| 164 | |
| 165 | kprintf("generate_tmp_ifid: new randomized ID from: "); |
| 166 | for (i = 0; i < 16; i++) |
| 167 | kprintf("%02x", seed[i]); |
| 168 | kprintf(" "); |
| 169 | } |
| 170 | |
| 171 | /* generate 16 bytes of pseudo-random value. */ |
| 172 | bzero(&ctxt, sizeof(ctxt)); |
| 173 | MD5Init(&ctxt); |
| 174 | MD5Update(&ctxt, seed, sizeof(seed)); |
| 175 | MD5Final(digest, &ctxt); |
| 176 | |
| 177 | /* |
| 178 | * RFC 3041 3.2.1. (3) |
| 179 | * Take the left-most 64-bits of the MD5 digest and set bit 6 (the |
| 180 | * left-most bit is numbered 0) to zero. |
| 181 | */ |
| 182 | bcopy(digest, ret, 8); |
| 183 | ret[0] &= ~EUI64_UBIT; |
| 184 | |
| 185 | /* |
| 186 | * XXX: we'd like to ensure that the generated value is not zero |
| 187 | * for simplicity. If the caclculated digest happens to be zero, |
| 188 | * use a random non-zero value as the last resort. |
| 189 | */ |
| 190 | if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { |
| 191 | log(LOG_INFO, |
| 192 | "generate_tmp_ifid: computed MD5 value is zero.\n"); |
| 193 | |
| 194 | microtime(&tv); |
| 195 | val32 = krandom() ^ tv.tv_usec; |
| 196 | val32 = 1 + (val32 % (0xffffffff - 1)); |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * RFC 3041 3.2.1. (4) |
| 201 | * Take the rightmost 64-bits of the MD5 digest and save them in |
| 202 | * stable storage as the history value to be used in the next |
| 203 | * iteration of the algorithm. |
| 204 | */ |
| 205 | bcopy(&digest[8], seed0, 8); |
| 206 | |
| 207 | if (0) { /* for debugging purposes only */ |
| 208 | int i; |
| 209 | |
| 210 | kprintf("to: "); |
| 211 | for (i = 0; i < 16; i++) |
| 212 | kprintf("%02x", digest[i]); |
| 213 | kprintf("\n"); |
| 214 | } |
| 215 | |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * Get interface identifier for the specified interface. |
| 221 | * XXX assumes single sockaddr_dl (AF_LINK address) per an interface |
| 222 | */ |
| 223 | static int |
| 224 | get_hw_ifid(struct ifnet *ifp, |
| 225 | struct in6_addr *in6) /* upper 64bits are preserved */ |
| 226 | { |
| 227 | struct ifaddr_container *ifac; |
| 228 | struct sockaddr_dl *sdl; |
| 229 | u_int8_t *addr; |
| 230 | size_t addrlen; |
| 231 | static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; |
| 232 | static u_int8_t allone[8] = |
| 233 | { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
| 234 | |
| 235 | TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { |
| 236 | struct ifaddr *ifa = ifac->ifa; |
| 237 | |
| 238 | if (ifa->ifa_addr->sa_family != AF_LINK) |
| 239 | continue; |
| 240 | sdl = (struct sockaddr_dl *)ifa->ifa_addr; |
| 241 | if (sdl == NULL) |
| 242 | continue; |
| 243 | if (sdl->sdl_alen == 0) |
| 244 | continue; |
| 245 | |
| 246 | goto found; |
| 247 | } |
| 248 | |
| 249 | return -1; |
| 250 | |
| 251 | found: |
| 252 | addr = LLADDR(sdl); |
| 253 | addrlen = sdl->sdl_alen; |
| 254 | |
| 255 | /* get EUI64 */ |
| 256 | switch (ifp->if_type) { |
| 257 | case IFT_ETHER: |
| 258 | case IFT_ATM: |
| 259 | case IFT_IEEE1394: |
| 260 | #ifdef IFT_IEEE80211 |
| 261 | case IFT_IEEE80211: |
| 262 | #endif |
| 263 | /* IEEE802/EUI64 cases - what others? */ |
| 264 | /* IEEE1394 uses 16byte length address starting with EUI64 */ |
| 265 | if (addrlen > 8) |
| 266 | addrlen = 8; |
| 267 | |
| 268 | /* look at IEEE802/EUI64 only */ |
| 269 | if (addrlen != 8 && addrlen != 6) |
| 270 | return -1; |
| 271 | |
| 272 | /* |
| 273 | * check for invalid MAC address - on bsdi, we see it a lot |
| 274 | * since wildboar configures all-zero MAC on pccard before |
| 275 | * card insertion. |
| 276 | */ |
| 277 | if (bcmp(addr, allzero, addrlen) == 0) |
| 278 | return -1; |
| 279 | if (bcmp(addr, allone, addrlen) == 0) |
| 280 | return -1; |
| 281 | |
| 282 | /* make EUI64 address */ |
| 283 | if (addrlen == 8) |
| 284 | bcopy(addr, &in6->s6_addr[8], 8); |
| 285 | else if (addrlen == 6) { |
| 286 | in6->s6_addr[8] = addr[0]; |
| 287 | in6->s6_addr[9] = addr[1]; |
| 288 | in6->s6_addr[10] = addr[2]; |
| 289 | in6->s6_addr[11] = 0xff; |
| 290 | in6->s6_addr[12] = 0xfe; |
| 291 | in6->s6_addr[13] = addr[3]; |
| 292 | in6->s6_addr[14] = addr[4]; |
| 293 | in6->s6_addr[15] = addr[5]; |
| 294 | } |
| 295 | break; |
| 296 | case IFT_GIF: |
| 297 | #ifdef IFT_STF |
| 298 | case IFT_STF: |
| 299 | #endif |
| 300 | /* |
| 301 | * RFC2893 says: "SHOULD use IPv4 address as ifid source". |
| 302 | * however, IPv4 address is not very suitable as unique |
| 303 | * identifier source (can be renumbered). |
| 304 | * we don't do this. |
| 305 | */ |
| 306 | return -1; |
| 307 | |
| 308 | default: |
| 309 | return -1; |
| 310 | } |
| 311 | |
| 312 | /* sanity check: g bit must not indicate "group" */ |
| 313 | if (EUI64_GROUP(in6)) |
| 314 | return -1; |
| 315 | |
| 316 | /* convert EUI64 into IPv6 interface identifier */ |
| 317 | EUI64_TO_IFID(in6); |
| 318 | |
| 319 | /* |
| 320 | * sanity check: ifid must not be all zero, avoid conflict with |
| 321 | * subnet router anycast |
| 322 | */ |
| 323 | if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && |
| 324 | bcmp(&in6->s6_addr[9], allzero, 7) == 0) { |
| 325 | return -1; |
| 326 | } |
| 327 | |
| 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * Get interface identifier for the specified interface. If it is not |
| 333 | * available on ifp0, borrow interface identifier from other information |
| 334 | * sources. |
| 335 | */ |
| 336 | static int |
| 337 | get_ifid(struct ifnet *ifp0, |
| 338 | struct ifnet *altifp, /* secondary EUI64 source */ |
| 339 | struct in6_addr *in6) |
| 340 | { |
| 341 | const struct ifnet_array *arr; |
| 342 | int i; |
| 343 | |
| 344 | /* first, try to get it from the interface itself */ |
| 345 | if (get_hw_ifid(ifp0, in6) == 0) { |
| 346 | nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", |
| 347 | if_name(ifp0))); |
| 348 | goto success; |
| 349 | } |
| 350 | |
| 351 | /* try secondary EUI64 source. this basically is for ATM PVC */ |
| 352 | if (altifp && get_hw_ifid(altifp, in6) == 0) { |
| 353 | nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", |
| 354 | if_name(ifp0), if_name(altifp))); |
| 355 | goto success; |
| 356 | } |
| 357 | |
| 358 | /* next, try to get it from some other hardware interface */ |
| 359 | arr = ifnet_array_get(); |
| 360 | for (i = 0; i < arr->ifnet_count; ++i) { |
| 361 | struct ifnet *ifp = arr->ifnet_arr[i]; |
| 362 | |
| 363 | if (ifp == ifp0) |
| 364 | continue; |
| 365 | if (get_hw_ifid(ifp, in6) != 0) |
| 366 | continue; |
| 367 | |
| 368 | /* |
| 369 | * to borrow ifid from other interface, ifid needs to be |
| 370 | * globally unique |
| 371 | */ |
| 372 | if (IFID_UNIVERSAL(in6)) { |
| 373 | nd6log((LOG_DEBUG, |
| 374 | "%s: borrow interface identifier from %s\n", |
| 375 | if_name(ifp0), if_name(ifp))); |
| 376 | goto success; |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | /* last resort: get from random number source */ |
| 381 | if (get_rand_ifid(in6) == 0) { |
| 382 | nd6log((LOG_DEBUG, |
| 383 | "%s: interface identifier generated by random number\n", |
| 384 | if_name(ifp0))); |
| 385 | goto success; |
| 386 | } |
| 387 | |
| 388 | kprintf("%s: failed to get interface identifier\n", if_name(ifp0)); |
| 389 | return -1; |
| 390 | |
| 391 | success: |
| 392 | nd6log((LOG_INFO, "%s: ifid: " |
| 393 | "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", |
| 394 | if_name(ifp0), |
| 395 | in6->s6_addr[8], in6->s6_addr[9], |
| 396 | in6->s6_addr[10], in6->s6_addr[11], |
| 397 | in6->s6_addr[12], in6->s6_addr[13], |
| 398 | in6->s6_addr[14], in6->s6_addr[15])); |
| 399 | return 0; |
| 400 | } |
| 401 | |
| 402 | static int |
| 403 | in6_ifattach_linklocal(struct ifnet *ifp, |
| 404 | struct ifnet *altifp) /* secondary EUI64 source */ |
| 405 | { |
| 406 | struct in6_ifaddr *ia; |
| 407 | struct in6_aliasreq ifra; |
| 408 | struct nd_prefix pr0; |
| 409 | int i, error; |
| 410 | |
| 411 | /* |
| 412 | * configure link-local address. |
| 413 | */ |
| 414 | bzero(&ifra, sizeof(ifra)); |
| 415 | |
| 416 | /* |
| 417 | * in6_update_ifa() does not use ifra_name, but we accurately set it |
| 418 | * for safety. |
| 419 | */ |
| 420 | strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); |
| 421 | |
| 422 | ifra.ifra_addr.sin6_family = AF_INET6; |
| 423 | ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); |
| 424 | ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); |
| 425 | ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ |
| 426 | ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; |
| 427 | if (ifp->if_flags & IFF_LOOPBACK) { |
| 428 | ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; |
| 429 | ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); |
| 430 | } else { |
| 431 | if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { |
| 432 | nd6log((LOG_ERR, |
| 433 | "%s: no ifid available\n", if_name(ifp))); |
| 434 | return -1; |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); |
| 439 | ifra.ifra_prefixmask.sin6_family = AF_INET6; |
| 440 | ifra.ifra_prefixmask.sin6_addr = in6mask64; |
| 441 | |
| 442 | /* link-local addresses should NEVER expire. */ |
| 443 | ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; |
| 444 | ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; |
| 445 | |
| 446 | /* |
| 447 | * Do not let in6_update_ifa() do DAD, since we need a random delay |
| 448 | * before sending an NS at the first time the interface becomes up. |
| 449 | * Instead, in6_if_up() will start DAD with a proper random delay. |
| 450 | */ |
| 451 | ifra.ifra_flags |= IN6_IFF_NODAD; |
| 452 | |
| 453 | /* |
| 454 | * Now call in6_update_ifa() to do a bunch of procedures to configure |
| 455 | * a link-local address. We can set NULL to the 3rd argument, because |
| 456 | * we know there's no other link-local address on the interface |
| 457 | * and therefore we are adding one (instead of updating one). |
| 458 | */ |
| 459 | if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { |
| 460 | /* |
| 461 | * XXX: When the interface does not support IPv6, this call |
| 462 | * would fail in the SIOCSIFADDR ioctl. I believe the |
| 463 | * notification is rather confusing in this case, so just |
| 464 | * suppress it. (jinmei@kame.net 20010130) |
| 465 | */ |
| 466 | if (error != EAFNOSUPPORT) |
| 467 | log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " |
| 468 | "configure a link-local address on %s " |
| 469 | "(errno=%d)\n", |
| 470 | if_name(ifp), error); |
| 471 | return (-1); |
| 472 | } |
| 473 | |
| 474 | /* |
| 475 | * Adjust ia6_flags so that in6_if_up will perform DAD. |
| 476 | * XXX: Some P2P interfaces seem not to send packets just after |
| 477 | * becoming up, so we skip p2p interfaces for safety. |
| 478 | */ |
| 479 | ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ |
| 480 | #ifdef DIAGNOSTIC |
| 481 | if (!ia) { |
| 482 | panic("ia == NULL in in6_ifattach_linklocal"); |
| 483 | /* NOTREACHED */ |
| 484 | } |
| 485 | #endif |
| 486 | if (in6if_do_dad(ifp) && !(ifp->if_flags & IFF_POINTOPOINT)) { |
| 487 | ia->ia6_flags &= ~IN6_IFF_NODAD; |
| 488 | ia->ia6_flags |= IN6_IFF_TENTATIVE; |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * Make the link-local prefix (fe80::%link/64) as on-link. |
| 493 | * Since we'd like to manage prefixes separately from addresses, |
| 494 | * we make an ND6 prefix structure for the link-local prefix, |
| 495 | * and add it to the prefix list as a never-expire prefix. |
| 496 | * XXX: this change might affect some existing code base... |
| 497 | */ |
| 498 | bzero(&pr0, sizeof(pr0)); |
| 499 | pr0.ndpr_ifp = ifp; |
| 500 | /* this should be 64 at this moment. */ |
| 501 | pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); |
| 502 | pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; |
| 503 | pr0.ndpr_prefix = ifra.ifra_addr; |
| 504 | /* apply the mask for safety. (nd6_prelist_add will apply it again) */ |
| 505 | for (i = 0; i < 4; i++) { |
| 506 | pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= |
| 507 | in6mask64.s6_addr32[i]; |
| 508 | } |
| 509 | /* |
| 510 | * Initialize parameters. The link-local prefix must always be |
| 511 | * on-link, and its lifetimes never expire. |
| 512 | */ |
| 513 | pr0.ndpr_raf_onlink = 1; |
| 514 | pr0.ndpr_raf_auto = 1; /* probably meaningless */ |
| 515 | pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; |
| 516 | pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; |
| 517 | /* |
| 518 | * Since there is no other link-local addresses, nd6_prefix_lookup() |
| 519 | * probably returns NULL. However, we cannot always expect the result. |
| 520 | * For example, if we first remove the (only) existing link-local |
| 521 | * address, and then reconfigure another one, the prefix is still |
| 522 | * valid with referring to the old link-local address. |
| 523 | */ |
| 524 | if (nd6_prefix_lookup(&pr0) == NULL) { |
| 525 | if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) |
| 526 | return (error); |
| 527 | } |
| 528 | |
| 529 | return 0; |
| 530 | } |
| 531 | |
| 532 | static int |
| 533 | in6_ifattach_loopback(struct ifnet *ifp) /* must be IFT_LOOP */ |
| 534 | { |
| 535 | struct in6_aliasreq ifra; |
| 536 | int error; |
| 537 | |
| 538 | bzero(&ifra, sizeof(ifra)); |
| 539 | |
| 540 | /* |
| 541 | * in6_update_ifa() does not use ifra_name, but we accurately set it |
| 542 | * for safety. |
| 543 | */ |
| 544 | strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); |
| 545 | |
| 546 | ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); |
| 547 | ifra.ifra_prefixmask.sin6_family = AF_INET6; |
| 548 | ifra.ifra_prefixmask.sin6_addr = in6mask128; |
| 549 | |
| 550 | /* |
| 551 | * Always initialize ia_dstaddr (= broadcast address) to loopback |
| 552 | * address. Follows IPv4 practice - see in_ifinit(). |
| 553 | */ |
| 554 | ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); |
| 555 | ifra.ifra_dstaddr.sin6_family = AF_INET6; |
| 556 | ifra.ifra_dstaddr.sin6_addr = kin6addr_loopback; |
| 557 | |
| 558 | ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); |
| 559 | ifra.ifra_addr.sin6_family = AF_INET6; |
| 560 | ifra.ifra_addr.sin6_addr = kin6addr_loopback; |
| 561 | |
| 562 | /* the loopback address should NEVER expire. */ |
| 563 | ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; |
| 564 | ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; |
| 565 | |
| 566 | /* we don't need to perform DAD on loopback interfaces. */ |
| 567 | ifra.ifra_flags |= IN6_IFF_NODAD; |
| 568 | |
| 569 | /* skip registration to the prefix list. XXX should be temporary. */ |
| 570 | ifra.ifra_flags |= IN6_IFF_NOPFX; |
| 571 | |
| 572 | /* |
| 573 | * We are sure that this is a newly assigned address, so we can set |
| 574 | * NULL to the 3rd arg. |
| 575 | */ |
| 576 | if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { |
| 577 | log(LOG_ERR, "in6_ifattach_loopback: failed to configure " |
| 578 | "the loopback address on %s (errno=%d)\n", |
| 579 | if_name(ifp), error); |
| 580 | return (-1); |
| 581 | } |
| 582 | |
| 583 | return 0; |
| 584 | } |
| 585 | |
| 586 | /* |
| 587 | * compute NI group address, based on the current hostname setting. |
| 588 | * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). |
| 589 | * |
| 590 | * when ifp == NULL, the caller is responsible for filling scopeid. |
| 591 | */ |
| 592 | int |
| 593 | in6_nigroup(struct ifnet *ifp, const char *name, int namelen, |
| 594 | struct in6_addr *in6) |
| 595 | { |
| 596 | const char *p; |
| 597 | u_char *q; |
| 598 | MD5_CTX ctxt; |
| 599 | u_int8_t digest[16]; |
| 600 | char l; |
| 601 | char n[64]; /* a single label must not exceed 63 chars */ |
| 602 | |
| 603 | if (!namelen || !name) |
| 604 | return -1; |
| 605 | |
| 606 | p = name; |
| 607 | while (p && *p && *p != '.' && p - name < namelen) |
| 608 | p++; |
| 609 | if (p - name > sizeof(n) - 1) |
| 610 | return -1; /* label too long */ |
| 611 | l = p - name; |
| 612 | strncpy(n, name, l); |
| 613 | n[(int)l] = '\0'; |
| 614 | for (q = n; *q; q++) { |
| 615 | if ('A' <= *q && *q <= 'Z') |
| 616 | *q = *q - 'A' + 'a'; |
| 617 | } |
| 618 | |
| 619 | /* generate 8 bytes of pseudo-random value. */ |
| 620 | bzero(&ctxt, sizeof(ctxt)); |
| 621 | MD5Init(&ctxt); |
| 622 | MD5Update(&ctxt, &l, sizeof(l)); |
| 623 | MD5Update(&ctxt, n, l); |
| 624 | MD5Final(digest, &ctxt); |
| 625 | |
| 626 | bzero(in6, sizeof(*in6)); |
| 627 | in6->s6_addr16[0] = htons(0xff02); |
| 628 | if (ifp) |
| 629 | in6->s6_addr16[1] = htons(ifp->if_index); |
| 630 | in6->s6_addr8[11] = 2; |
| 631 | bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); |
| 632 | |
| 633 | return 0; |
| 634 | } |
| 635 | |
| 636 | struct netmsg_nigroup { |
| 637 | struct netmsg_base nmsg; |
| 638 | const char *name; |
| 639 | int namelen; |
| 640 | }; |
| 641 | |
| 642 | static void |
| 643 | in6_nigroup_attach_dispatch(netmsg_t msg) |
| 644 | { |
| 645 | struct netmsg_nigroup *nmsg = (struct netmsg_nigroup *)msg; |
| 646 | struct sockaddr_in6 mltaddr; |
| 647 | struct in6_multi *in6m; |
| 648 | const struct ifnet_array *arr; |
| 649 | int error, i; |
| 650 | |
| 651 | bzero(&mltaddr, sizeof(mltaddr)); |
| 652 | mltaddr.sin6_family = AF_INET6; |
| 653 | mltaddr.sin6_len = sizeof(struct sockaddr_in6); |
| 654 | if (in6_nigroup(NULL, nmsg->name, nmsg->namelen, |
| 655 | &mltaddr.sin6_addr) != 0) |
| 656 | goto done; |
| 657 | |
| 658 | arr = ifnet_array_get(); |
| 659 | for (i = 0; i < arr->ifnet_count; ++i) { |
| 660 | struct ifnet *ifp = arr->ifnet_arr[i]; |
| 661 | |
| 662 | mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); |
| 663 | in6m = IN6_LOOKUP_MULTI(&mltaddr.sin6_addr, ifp); |
| 664 | if (!in6m) { |
| 665 | if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) { |
| 666 | nd6log((LOG_ERR, "%s: failed to join %s " |
| 667 | "(errno=%d)\n", if_name(ifp), |
| 668 | ip6_sprintf(&mltaddr.sin6_addr), |
| 669 | error)); |
| 670 | } |
| 671 | } |
| 672 | } |
| 673 | done: |
| 674 | lwkt_replymsg(&nmsg->nmsg.lmsg, 0); |
| 675 | } |
| 676 | |
| 677 | void |
| 678 | in6_nigroup_attach(const char *name, int namelen) |
| 679 | { |
| 680 | struct netmsg_nigroup nmsg; |
| 681 | |
| 682 | netmsg_init(&nmsg.nmsg, NULL, &curthread->td_msgport, 0, |
| 683 | in6_nigroup_attach_dispatch); |
| 684 | nmsg.name = name; |
| 685 | nmsg.namelen = namelen; |
| 686 | lwkt_domsg(netisr_cpuport(0), &nmsg.nmsg.lmsg, 0); |
| 687 | } |
| 688 | |
| 689 | static void |
| 690 | in6_nigroup_detach_dispatch(netmsg_t msg) |
| 691 | { |
| 692 | struct netmsg_nigroup *nmsg = (struct netmsg_nigroup *)msg; |
| 693 | struct sockaddr_in6 mltaddr; |
| 694 | struct in6_multi *in6m; |
| 695 | const struct ifnet_array *arr; |
| 696 | int i; |
| 697 | |
| 698 | bzero(&mltaddr, sizeof(mltaddr)); |
| 699 | mltaddr.sin6_family = AF_INET6; |
| 700 | mltaddr.sin6_len = sizeof(struct sockaddr_in6); |
| 701 | if (in6_nigroup(NULL, nmsg->name, nmsg->namelen, |
| 702 | &mltaddr.sin6_addr) != 0) |
| 703 | goto done; |
| 704 | |
| 705 | arr = ifnet_array_get(); |
| 706 | for (i = 0; i < arr->ifnet_count; ++i) { |
| 707 | struct ifnet *ifp = arr->ifnet_arr[i]; |
| 708 | |
| 709 | mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); |
| 710 | in6m = IN6_LOOKUP_MULTI(&mltaddr.sin6_addr, ifp); |
| 711 | if (in6m) |
| 712 | in6_delmulti(in6m); |
| 713 | } |
| 714 | done: |
| 715 | lwkt_replymsg(&nmsg->nmsg.lmsg, 0); |
| 716 | } |
| 717 | |
| 718 | void |
| 719 | in6_nigroup_detach(const char *name, int namelen) |
| 720 | { |
| 721 | struct netmsg_nigroup nmsg; |
| 722 | |
| 723 | netmsg_init(&nmsg.nmsg, NULL, &curthread->td_msgport, 0, |
| 724 | in6_nigroup_detach_dispatch); |
| 725 | nmsg.name = name; |
| 726 | nmsg.namelen = namelen; |
| 727 | lwkt_domsg(netisr_cpuport(0), &nmsg.nmsg.lmsg, 0); |
| 728 | } |
| 729 | |
| 730 | /* |
| 731 | * XXX multiple loopback interface needs more care. for instance, |
| 732 | * nodelocal address needs to be configured onto only one of them. |
| 733 | * XXX multiple link-local address case |
| 734 | */ |
| 735 | void |
| 736 | in6_ifattach(struct ifnet *ifp, |
| 737 | struct ifnet *altifp) /* secondary EUI64 source */ |
| 738 | { |
| 739 | struct in6_ifaddr *ia; |
| 740 | struct in6_addr in6; |
| 741 | |
| 742 | /* some of the interfaces are inherently not IPv6 capable */ |
| 743 | switch (ifp->if_type) { |
| 744 | #ifdef IFT_BRIDGE /* OpenBSD 2.8, NetBSD 1.6 */ |
| 745 | case IFT_BRIDGE: |
| 746 | return; |
| 747 | #endif |
| 748 | case IFT_PFLOG: |
| 749 | case IFT_PFSYNC: |
| 750 | case IFT_CARP: |
| 751 | return; |
| 752 | } |
| 753 | |
| 754 | /* |
| 755 | * quirks based on interface type |
| 756 | */ |
| 757 | switch (ifp->if_type) { |
| 758 | #ifdef IFT_STF |
| 759 | case IFT_STF: |
| 760 | /* |
| 761 | * 6to4 interface is a very special kind of beast. |
| 762 | * no multicast, no linklocal. RFC2529 specifies how to make |
| 763 | * linklocals for 6to4 interface, but there's no use and |
| 764 | * it is rather harmful to have one. |
| 765 | */ |
| 766 | goto statinit; |
| 767 | #endif |
| 768 | default: |
| 769 | break; |
| 770 | } |
| 771 | |
| 772 | /* |
| 773 | * usually, we require multicast capability to the interface |
| 774 | */ |
| 775 | if (!(ifp->if_flags & IFF_MULTICAST)) { |
| 776 | log(LOG_INFO, "in6_ifattach: " |
| 777 | "%s is not multicast capable, IPv6 not enabled\n", |
| 778 | if_name(ifp)); |
| 779 | return; |
| 780 | } |
| 781 | |
| 782 | /* |
| 783 | * assign loopback address for loopback interface. |
| 784 | * XXX multiple loopback interface case. |
| 785 | */ |
| 786 | if (ifp->if_flags & IFF_LOOPBACK) { |
| 787 | in6 = kin6addr_loopback; |
| 788 | if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { |
| 789 | if (in6_ifattach_loopback(ifp) != 0) |
| 790 | return; |
| 791 | } |
| 792 | } |
| 793 | |
| 794 | /* |
| 795 | * assign a link-local address, if there's none. |
| 796 | */ |
| 797 | if (ip6_auto_linklocal) { |
| 798 | ia = in6ifa_ifpforlinklocal(ifp, 0); |
| 799 | if (ia == NULL) { |
| 800 | if (in6_ifattach_linklocal(ifp, altifp) == 0) { |
| 801 | /* linklocal address assigned */ |
| 802 | } else { |
| 803 | /* failed to assign linklocal address. bark? */ |
| 804 | } |
| 805 | } |
| 806 | } |
| 807 | |
| 808 | #ifdef IFT_STF /* XXX */ |
| 809 | statinit: |
| 810 | #endif |
| 811 | |
| 812 | /* update dynamically. */ |
| 813 | if (in6_maxmtu < ifp->if_mtu) |
| 814 | in6_maxmtu = ifp->if_mtu; |
| 815 | } |
| 816 | |
| 817 | /* |
| 818 | * NOTE: in6_ifdetach() does not support loopback if at this moment. |
| 819 | */ |
| 820 | static void |
| 821 | in6_ifdetach_dispatch(netmsg_t nmsg) |
| 822 | { |
| 823 | struct lwkt_msg *lmsg = &nmsg->lmsg; |
| 824 | struct ifnet *ifp = lmsg->u.ms_resultp; |
| 825 | struct ifaddr_container *ifac, *next; |
| 826 | struct rtentry *rt; |
| 827 | struct sockaddr_in6 sin6; |
| 828 | struct in6_multi *in6m, *in6m_next; |
| 829 | |
| 830 | ASSERT_NETISR0; |
| 831 | |
| 832 | /* remove neighbor management table */ |
| 833 | nd6_purge(ifp); |
| 834 | |
| 835 | /* nuke any of IPv6 addresses we have */ |
| 836 | TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid], ifa_link, |
| 837 | next) { |
| 838 | struct ifaddr *ifa = ifac->ifa; |
| 839 | |
| 840 | if (ifa->ifa_addr->sa_family != AF_INET6) |
| 841 | continue; |
| 842 | in6_purgeaddr(ifa); |
| 843 | } |
| 844 | |
| 845 | /* |
| 846 | * XXX |
| 847 | * These were code trying to nuke inet6 addresses again, but all |
| 848 | * inet6 addresses must have been deleted above; use assertion. |
| 849 | */ |
| 850 | TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { |
| 851 | KASSERT(ifac->ifa->ifa_addr->sa_family != AF_INET6, |
| 852 | ("still has inet6 addr")); |
| 853 | } |
| 854 | |
| 855 | /* leave from all multicast groups joined */ |
| 856 | in6_pcbpurgeif0(&ripcbinfo, ifp); |
| 857 | in6_pcbpurgeif0(&udbinfo[0], ifp); |
| 858 | for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { |
| 859 | in6m_next = LIST_NEXT(in6m, in6m_entry); |
| 860 | if (in6m->in6m_ifp != ifp) |
| 861 | continue; |
| 862 | in6_delmulti(in6m); |
| 863 | in6m = NULL; |
| 864 | } |
| 865 | |
| 866 | /* |
| 867 | * remove neighbor management table. we call it twice just to make |
| 868 | * sure we nuke everything. maybe we need just one call. |
| 869 | * XXX: since the first call did not release addresses, some prefixes |
| 870 | * might remain. We should call nd6_purge() again to release the |
| 871 | * prefixes after removing all addresses above. |
| 872 | * (Or can we just delay calling nd6_purge until at this point?) |
| 873 | */ |
| 874 | nd6_purge(ifp); |
| 875 | |
| 876 | /* remove route to link-local allnodes multicast (ff02::1) */ |
| 877 | bzero(&sin6, sizeof(sin6)); |
| 878 | sin6.sin6_len = sizeof(struct sockaddr_in6); |
| 879 | sin6.sin6_family = AF_INET6; |
| 880 | sin6.sin6_addr = kin6addr_linklocal_allnodes; |
| 881 | sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); |
| 882 | rt = rtpurelookup((struct sockaddr *)&sin6); |
| 883 | if (rt != NULL && rt->rt_ifp == ifp) { |
| 884 | --rt->rt_refcnt; |
| 885 | rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), |
| 886 | rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); |
| 887 | } |
| 888 | |
| 889 | lwkt_replymsg(lmsg, 0); |
| 890 | } |
| 891 | |
| 892 | void |
| 893 | in6_ifdetach(struct ifnet *ifp) |
| 894 | { |
| 895 | struct netmsg_base nmsg; |
| 896 | struct lwkt_msg *lmsg = &nmsg.lmsg; |
| 897 | |
| 898 | netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0, |
| 899 | in6_ifdetach_dispatch); |
| 900 | lmsg->u.ms_resultp = ifp; |
| 901 | lwkt_domsg(netisr_cpuport(0), lmsg, 0); |
| 902 | } |
| 903 | |
| 904 | void |
| 905 | in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid, |
| 906 | int generate) |
| 907 | { |
| 908 | u_int8_t nullbuf[8]; |
| 909 | struct nd_ifinfo *ndi = ND_IFINFO(ifp); |
| 910 | |
| 911 | bzero(nullbuf, sizeof(nullbuf)); |
| 912 | if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { |
| 913 | /* we've never created a random ID. Create a new one. */ |
| 914 | generate = 1; |
| 915 | } |
| 916 | |
| 917 | if (generate) { |
| 918 | bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); |
| 919 | |
| 920 | /* generate_tmp_ifid will update seedn and buf */ |
| 921 | generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, |
| 922 | ndi->randomid); |
| 923 | } |
| 924 | bcopy(ndi->randomid, retbuf, 8); |
| 925 | } |
| 926 | |
| 927 | static void |
| 928 | in6_tmpaddrtimer(void *arg __unused) |
| 929 | { |
| 930 | struct lwkt_msg *lmsg = &in6_tmpaddrtimer_netmsg.lmsg; |
| 931 | |
| 932 | KASSERT(mycpuid == 0, ("not on cpu0")); |
| 933 | crit_enter(); |
| 934 | if (lmsg->ms_flags & MSGF_DONE) |
| 935 | lwkt_sendmsg_oncpu(netisr_cpuport(0), lmsg); |
| 936 | crit_exit(); |
| 937 | } |
| 938 | |
| 939 | static void |
| 940 | in6_tmpaddrtimer_dispatch(netmsg_t nmsg) |
| 941 | { |
| 942 | const struct ifnet_array *arr; |
| 943 | struct nd_ifinfo *ndi; |
| 944 | u_int8_t nullbuf[8]; |
| 945 | int i; |
| 946 | |
| 947 | ASSERT_NETISR0; |
| 948 | |
| 949 | crit_enter(); |
| 950 | lwkt_replymsg(&nmsg->lmsg, 0); /* reply ASAP */ |
| 951 | crit_exit(); |
| 952 | |
| 953 | bzero(nullbuf, sizeof(nullbuf)); |
| 954 | arr = ifnet_array_get(); |
| 955 | for (i = 0; i < arr->ifnet_count; ++i) { |
| 956 | struct ifnet *ifp = arr->ifnet_arr[i]; |
| 957 | |
| 958 | if (ifp->if_afdata[AF_INET6] == NULL) |
| 959 | continue; |
| 960 | ndi = ND_IFINFO(ifp); |
| 961 | if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { |
| 962 | /* |
| 963 | * We've been generating a random ID on this interface. |
| 964 | * Create a new one. |
| 965 | */ |
| 966 | generate_tmp_ifid(ndi->randomseed0, |
| 967 | ndi->randomseed1, |
| 968 | ndi->randomid); |
| 969 | } |
| 970 | } |
| 971 | |
| 972 | callout_reset(&in6_tmpaddrtimer_ch, |
| 973 | (ip6_temp_preferred_lifetime - ip6_desync_factor - |
| 974 | ip6_temp_regen_advance) * hz, |
| 975 | in6_tmpaddrtimer, NULL); |
| 976 | } |
| 977 | |
| 978 | /* |
| 979 | * Timer for regeneranation of temporary addresses randomize ID |
| 980 | */ |
| 981 | void |
| 982 | in6_tmpaddrtimer_init(void) |
| 983 | { |
| 984 | callout_init_mp(&in6_tmpaddrtimer_ch); |
| 985 | netmsg_init(&in6_tmpaddrtimer_netmsg, NULL, &netisr_adone_rport, |
| 986 | MSGF_PRIORITY, in6_tmpaddrtimer_dispatch); |
| 987 | callout_reset_bycpu(&in6_tmpaddrtimer_ch, |
| 988 | (ip6_temp_preferred_lifetime - ip6_desync_factor - |
| 989 | ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL, 0); |
| 990 | } |