in6_ifattach.c revision 1.8
1 /* $NetBSD: in6_ifattach.c,v 1.8 1999/09/19 21:31:34 is Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/malloc.h> 35 #include <sys/socket.h> 36 #include <sys/sockio.h> 37 38 #include <net/if.h> 39 #include <net/if_dl.h> 40 #include <net/if_types.h> 41 #include <net/route.h> 42 43 #include <netinet/in.h> 44 #include <netinet/in_var.h> 45 #ifndef __NetBSD__ 46 #include <netinet/if_ether.h> 47 #endif 48 49 #include <netinet6/in6.h> 50 #include <netinet6/ip6.h> 51 #include <netinet6/ip6_var.h> 52 #include <netinet6/in6_ifattach.h> 53 #include <netinet6/ip6.h> 54 #include <netinet6/ip6_var.h> 55 #include <netinet6/nd6.h> 56 57 static struct in6_addr llsol; 58 59 struct in6_addr **in6_iflladdr = NULL; 60 unsigned long in6_maxmtu = 0; 61 62 int found_first_ifid = 0; 63 #define IFID_LEN 8 64 static char first_ifid[IFID_LEN]; 65 66 static int laddr_to_eui64 __P((u_int8_t *, u_int8_t *, size_t)); 67 68 static int 69 laddr_to_eui64(dst, src, len) 70 u_int8_t *dst; 71 u_int8_t *src; 72 size_t len; 73 { 74 switch (len) { 75 case 1: 76 bzero(dst, 7); 77 dst[7] = src[0]; 78 break; 79 case 6: 80 dst[0] = src[0]; 81 dst[1] = src[1]; 82 dst[2] = src[2]; 83 dst[3] = 0xff; 84 dst[4] = 0xfe; 85 dst[5] = src[3]; 86 dst[6] = src[4]; 87 dst[7] = src[5]; 88 break; 89 case 8: 90 bcopy(src, dst, len); 91 break; 92 default: 93 return EINVAL; 94 } 95 96 return 0; 97 } 98 99 /* 100 * Find first ifid on list of interfaces. 101 * This is assumed that ifp0's interface token (for example, IEEE802 MAC) 102 * is globally unique. We may need to have a flag parameter in the future. 103 */ 104 int 105 in6_ifattach_getifid(ifp0) 106 struct ifnet *ifp0; 107 { 108 struct ifnet *ifp; 109 struct ifaddr *ifa; 110 u_int8_t *addr = NULL; 111 int addrlen = 0; 112 struct sockaddr_dl *sdl; 113 114 if (found_first_ifid) 115 return 0; 116 117 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 118 if (ifp0 != NULL && ifp0 != ifp) 119 continue; 120 for (ifa = ifp->if_addrlist.tqh_first; 121 ifa; 122 ifa = ifa->ifa_list.tqe_next) { 123 if (ifa->ifa_addr->sa_family != AF_LINK) 124 continue; 125 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 126 if (sdl == NULL) 127 continue; 128 if (sdl->sdl_alen == 0) 129 continue; 130 switch (ifp->if_type) { 131 case IFT_ETHER: 132 case IFT_FDDI: 133 case IFT_ATM: 134 case IFT_ARCNET: 135 /* what others? */ 136 /* IEEE802/EUI64 cases - what others? */ 137 addr = LLADDR(sdl); 138 addrlen = sdl->sdl_alen; 139 /* 140 * to copy ifid from IEEE802/EUI64 interface, 141 * u bit of the source needs to be 0. 142 */ 143 if ((addr[0] & 0x02) != 0) 144 break; 145 goto found; 146 default: 147 break; 148 } 149 } 150 } 151 #ifdef DEBUG 152 printf("in6_ifattach_getifid: failed to get EUI64"); 153 #endif 154 return EADDRNOTAVAIL; 155 156 found: 157 if (laddr_to_eui64(first_ifid, addr, addrlen) == 0) 158 found_first_ifid = 1; 159 160 if (found_first_ifid) { 161 printf("%s: supplying EUI64: " 162 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 163 ifp->if_xname, 164 first_ifid[0] & 0xff, first_ifid[1] & 0xff, 165 first_ifid[2] & 0xff, first_ifid[3] & 0xff, 166 first_ifid[4] & 0xff, first_ifid[5] & 0xff, 167 first_ifid[6] & 0xff, first_ifid[7] & 0xff); 168 169 /* invert u bit to convert EUI64 to RFC2373 interface ID. */ 170 first_ifid[0] ^= 0x02; 171 172 return 0; 173 } else { 174 #ifdef DEBUG 175 printf("in6_ifattach_getifid: failed to get EUI64"); 176 #endif 177 return EADDRNOTAVAIL; 178 } 179 } 180 181 /* 182 * add link-local address to *pseudo* p2p interfaces. 183 * get called when the first MAC address is made available in in6_ifattach(). 184 * 185 * XXX I start feeling this as a bad idea. (itojun) 186 */ 187 void 188 in6_ifattach_p2p() 189 { 190 struct ifnet *ifp; 191 192 /* prevent infinite loop. just in case. */ 193 if (found_first_ifid == 0) 194 return; 195 196 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 197 switch (ifp->if_type) { 198 case IFT_GIF: 199 /* pseudo interfaces - safe to initialize here */ 200 in6_ifattach(ifp, IN6_IFT_P2P, 0, 0); 201 break; 202 case IFT_FAITH: 203 /* this mistakingly becomes IFF_UP */ 204 break; 205 case IFT_SLIP: 206 /* IPv6 is not supported */ 207 break; 208 case IFT_PPP: 209 /* this is not a pseudo interface, skip it */ 210 break; 211 default: 212 break; 213 } 214 } 215 } 216 217 void 218 in6_ifattach(ifp, type, laddr, noloop) 219 struct ifnet *ifp; 220 u_int type; 221 caddr_t laddr; 222 /* size_t laddrlen; */ 223 int noloop; 224 { 225 static size_t if_indexlim = 8; 226 struct sockaddr_in6 mltaddr; 227 struct sockaddr_in6 mltmask; 228 struct sockaddr_in6 gate; 229 struct sockaddr_in6 mask; 230 231 struct in6_ifaddr *ia, *ib, *oia; 232 struct ifaddr *ifa; 233 int rtflag = 0; 234 235 if (type == IN6_IFT_P2P && found_first_ifid == 0) { 236 printf("%s: no ifid available for IPv6 link-local address\n", 237 ifp->if_xname); 238 return; 239 } 240 241 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 242 printf("%s: not multicast capable, IPv6 not enabled\n", 243 ifp->if_xname); 244 return; 245 } 246 247 /* 248 * We have some arrays that should be indexed by if_index. 249 * since if_index will grow dynamically, they should grow too. 250 * struct in6_addr **in6_iflladdr 251 */ 252 if (in6_iflladdr == NULL || if_index >= if_indexlim) { 253 size_t n; 254 caddr_t q; 255 size_t olim; 256 257 olim = if_indexlim; 258 while (if_index >= if_indexlim) 259 if_indexlim <<= 1; 260 261 /* grow in6_iflladdr */ 262 n = if_indexlim * sizeof(struct in6_addr *); 263 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); 264 bzero(q, n); 265 if (in6_iflladdr) { 266 bcopy((caddr_t)in6_iflladdr, q, 267 olim * sizeof(struct in6_addr *)); 268 free((caddr_t)in6_iflladdr, M_IFADDR); 269 } 270 in6_iflladdr = (struct in6_addr **)q; 271 } 272 273 /* 274 * To prevent to assign link-local address to PnP network 275 * cards multiple times. 276 * This is lengthy for P2P and LOOP but works. 277 */ 278 ifa = TAILQ_FIRST(&ifp->if_addrlist); 279 if (ifa != NULL) { 280 for ( ; ifa; ifa = TAILQ_NEXT(ifa, ifa_list)) { 281 if (ifa->ifa_addr->sa_family != AF_INET6) 282 continue; 283 if (IN6_IS_ADDR_LINKLOCAL(&satosin6(ifa->ifa_addr)->sin6_addr)) 284 return; 285 } 286 } else { 287 TAILQ_INIT(&ifp->if_addrlist); 288 } 289 290 /* 291 * link-local address 292 */ 293 ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_WAITOK); 294 bzero((caddr_t)ia, sizeof(*ia)); 295 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 296 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 297 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 298 ia->ia_ifp = ifp; 299 TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 300 /* 301 * Also link into the IPv6 address chain beginning with in6_ifaddr. 302 * kazu opposed it, but itojun & jinmei wanted. 303 */ 304 if ((oia = in6_ifaddr) != NULL) { 305 for (; oia->ia_next; oia = oia->ia_next) 306 continue; 307 oia->ia_next = ia; 308 } else 309 in6_ifaddr = ia; 310 311 ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 312 ia->ia_prefixmask.sin6_family = AF_INET6; 313 ia->ia_prefixmask.sin6_addr = in6mask64; 314 315 bzero(&ia->ia_addr, sizeof(struct sockaddr_in6)); 316 ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6); 317 ia->ia_addr.sin6_family = AF_INET6; 318 ia->ia_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 319 ia->ia_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 320 ia->ia_addr.sin6_addr.s6_addr32[1] = 0; 321 322 switch (type) { 323 case IN6_IFT_LOOP: 324 ia->ia_addr.sin6_addr.s6_addr32[2] = 0; 325 ia->ia_addr.sin6_addr.s6_addr32[3] = htonl(1); 326 break; 327 case IN6_IFT_802: 328 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 329 ia->ia_ifa.ifa_flags |= RTF_CLONING; 330 rtflag = RTF_CLONING; 331 /* fall through */ 332 case IN6_IFT_P2P802: 333 if (laddr == NULL) 334 break; 335 /* XXX use laddrlen */ 336 if (laddr_to_eui64(&ia->ia_addr.sin6_addr.s6_addr8[8], 337 laddr, 6) != 0) { 338 break; 339 } 340 /* invert u bit to convert EUI64 to RFC2373 interface ID. */ 341 ia->ia_addr.sin6_addr.s6_addr8[8] ^= 0x02; 342 if (found_first_ifid == 0) { 343 if (in6_ifattach_getifid(ifp) == 0) 344 in6_ifattach_p2p(); 345 } 346 break; 347 case IN6_IFT_P2P: 348 bcopy((caddr_t)first_ifid, 349 (caddr_t)&ia->ia_addr.sin6_addr.s6_addr8[8], 350 IFID_LEN); 351 break; 352 case IN6_IFT_ARCNET: 353 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 354 ia->ia_ifa.ifa_flags |= RTF_CLONING; 355 rtflag = RTF_CLONING; 356 if (laddr == NULL) 357 break; 358 onebyte_to_eui64(&ia->ia_addr.sin6_addr.s6_addr8[8], laddr); 359 break; 360 } 361 362 ia->ia_ifa.ifa_metric = ifp->if_metric; 363 364 if (ifp->if_ioctl != NULL) { 365 int s; 366 int error; 367 368 /* 369 * give the interface a chance to initialize, in case this 370 * is the first address to be added. 371 */ 372 s = splimp(); 373 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 374 splx(s); 375 376 if (error) { 377 switch (error) { 378 case EAFNOSUPPORT: 379 printf("%s: IPv6 not supported\n", 380 ifp->if_xname); 381 break; 382 default: 383 printf("%s: SIOCSIFADDR error %d\n", 384 ifp->if_xname, error); 385 break; 386 } 387 388 /* undo changes */ 389 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 390 if (oia) 391 oia->ia_next = ia->ia_next; 392 else 393 in6_ifaddr = ia->ia_next; 394 free(ia, M_IFADDR); 395 return; 396 } 397 } 398 399 /* add route to the interface. */ 400 rtrequest(RTM_ADD, 401 (struct sockaddr *)&ia->ia_addr, 402 (struct sockaddr *)&ia->ia_addr, 403 (struct sockaddr *)&ia->ia_prefixmask, 404 RTF_UP|rtflag, 405 (struct rtentry **)0); 406 ia->ia_flags |= IFA_ROUTE; 407 408 if (type == IN6_IFT_P2P || type == IN6_IFT_P2P802) { 409 /* 410 * route local address to loopback 411 */ 412 bzero(&gate, sizeof(gate)); 413 gate.sin6_len = sizeof(struct sockaddr_in6); 414 gate.sin6_family = AF_INET6; 415 gate.sin6_addr = in6addr_loopback; 416 bzero(&mask, sizeof(mask)); 417 mask.sin6_len = sizeof(struct sockaddr_in6); 418 mask.sin6_family = AF_INET6; 419 mask.sin6_addr = in6mask64; 420 rtrequest(RTM_ADD, 421 (struct sockaddr *)&ia->ia_addr, 422 (struct sockaddr *)&gate, 423 (struct sockaddr *)&mask, 424 RTF_UP|RTF_HOST, 425 (struct rtentry **)0); 426 } 427 428 /* 429 * loopback address 430 */ 431 ib = (struct in6_ifaddr *)NULL; 432 if (type == IN6_IFT_LOOP) { 433 ib = (struct in6_ifaddr *) 434 malloc(sizeof(*ib), M_IFADDR, M_WAITOK); 435 bzero((caddr_t)ib, sizeof(*ib)); 436 ib->ia_ifa.ifa_addr = (struct sockaddr *)&ib->ia_addr; 437 ib->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ib->ia_dstaddr; 438 ib->ia_ifa.ifa_netmask = (struct sockaddr *)&ib->ia_prefixmask; 439 ib->ia_ifp = ifp; 440 441 ia->ia_next = ib; 442 TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ib, 443 ifa_list); 444 445 ib->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 446 ib->ia_prefixmask.sin6_family = AF_INET6; 447 ib->ia_prefixmask.sin6_addr = in6mask128; 448 ib->ia_addr.sin6_len = sizeof(struct sockaddr_in6); 449 ib->ia_addr.sin6_family = AF_INET6; 450 ib->ia_addr.sin6_addr = in6addr_loopback; 451 #ifdef __bsdi__ 452 /* 453 * It is necessary to set the loopback address to the dstaddr 454 * field at least for BSDI. Without this setting, the BSDI 455 * version of ifa_ifwithroute() rejects to add a route 456 * to the loopback interface. 457 */ 458 ib->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 459 ib->ia_dstaddr.sin6_family = AF_INET6; 460 ib->ia_dstaddr.sin6_addr = in6addr_loopback; 461 #endif /* __bsdi__ */ 462 463 ib->ia_ifa.ifa_metric = ifp->if_metric; 464 465 rtrequest(RTM_ADD, 466 (struct sockaddr *)&ib->ia_addr, 467 (struct sockaddr *)&ib->ia_addr, 468 (struct sockaddr *)&ib->ia_prefixmask, 469 RTF_UP|RTF_HOST, 470 (struct rtentry **)0); 471 472 ib->ia_flags |= IFA_ROUTE; 473 } 474 475 /* 476 * join multicast 477 */ 478 if (ifp->if_flags & IFF_MULTICAST) { 479 int error; /* not used */ 480 481 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 482 /* Restore saved multicast addresses(if any). */ 483 in6_restoremkludge(ia, ifp); 484 #endif 485 486 bzero(&mltmask, sizeof(mltmask)); 487 mltmask.sin6_len = sizeof(struct sockaddr_in6); 488 mltmask.sin6_family = AF_INET6; 489 mltmask.sin6_addr = in6mask32; 490 491 /* 492 * join link-local all-nodes address 493 */ 494 bzero(&mltaddr, sizeof(mltaddr)); 495 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 496 mltaddr.sin6_family = AF_INET6; 497 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 498 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 499 rtrequest(RTM_ADD, 500 (struct sockaddr *)&mltaddr, 501 (struct sockaddr *)&ia->ia_addr, 502 (struct sockaddr *)&mltmask, 503 RTF_UP|RTF_CLONING, /* xxx */ 504 (struct rtentry **)0); 505 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 506 507 if (type == IN6_IFT_LOOP) { 508 /* 509 * join node-local all-nodes address 510 */ 511 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 512 rtrequest(RTM_ADD, 513 (struct sockaddr *)&mltaddr, 514 (struct sockaddr *)&ib->ia_addr, 515 (struct sockaddr *)&mltmask, 516 RTF_UP, 517 (struct rtentry **)0); 518 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 519 } else { 520 /* 521 * join solicited multicast address 522 */ 523 bzero(&llsol, sizeof(llsol)); 524 llsol.s6_addr16[0] = htons(0xff02); 525 llsol.s6_addr16[1] = htons(ifp->if_index); 526 llsol.s6_addr32[1] = 0; 527 llsol.s6_addr32[2] = htonl(1); 528 llsol.s6_addr32[3] = ia->ia_addr.sin6_addr.s6_addr32[3]; 529 llsol.s6_addr8[12] = 0xff; 530 (void)in6_addmulti(&llsol, ifp, &error); 531 } 532 } 533 534 /* update dynamically. */ 535 in6_iflladdr[ifp->if_index] = &ia->ia_addr.sin6_addr; 536 if (in6_maxmtu < ifp->if_mtu) 537 in6_maxmtu = ifp->if_mtu; 538 539 /* initialize NDP variables */ 540 nd6_ifattach(ifp); 541 542 /* mark the address TENTATIVE, if needed. */ 543 switch (ifp->if_type) { 544 case IFT_ARCNET: 545 case IFT_ETHER: 546 case IFT_FDDI: 547 #if 0 548 case IFT_ATM: 549 case IFT_SLIP: 550 case IFT_PPP: 551 #endif 552 ia->ia6_flags |= IN6_IFF_TENTATIVE; 553 /* nd6_dad_start() will be called in in6_if_up */ 554 break; 555 case IFT_GIF: 556 case IFT_LOOP: 557 case IFT_FAITH: 558 default: 559 break; 560 } 561 562 return; 563 } 564 565 void 566 in6_ifdetach(ifp) 567 struct ifnet *ifp; 568 { 569 struct in6_ifaddr *ia, *oia; 570 struct ifaddr *ifa; 571 struct rtentry *rt; 572 short rtflags; 573 574 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { 575 if (ifa->ifa_addr->sa_family != AF_INET6 576 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 577 continue; 578 } 579 580 ia = (struct in6_ifaddr *)ifa; 581 582 /* remove from the routing table */ 583 if ((ia->ia_flags & IFA_ROUTE) 584 && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) { 585 rtflags = rt->rt_flags; 586 rtfree(rt); 587 rtrequest(RTM_DELETE, 588 (struct sockaddr *)&ia->ia_addr, 589 (struct sockaddr *)&ia->ia_addr, 590 (struct sockaddr *)&ia->ia_prefixmask, 591 rtflags, (struct rtentry **)0); 592 } 593 594 /* remove from the linked list */ 595 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 596 597 /* also remove from the IPv6 address chain(itojun&jinmei) */ 598 oia = ia; 599 if (oia == (ia = in6_ifaddr)) 600 in6_ifaddr = ia->ia_next; 601 else { 602 while (ia->ia_next && (ia->ia_next != oia)) 603 ia = ia->ia_next; 604 if (ia->ia_next) 605 ia->ia_next = oia->ia_next; 606 #ifdef DEBUG 607 else 608 printf("%s: didn't unlink in6ifaddr from " 609 "list\n", ifp->if_xname); 610 #endif 611 } 612 613 free(ia, M_IFADDR); 614 } 615 } 616
Indexes created Tue Sep 23 20:09:58 GMT 2025