in6_ifattach.c revision 1.10
1 /* $NetBSD: in6_ifattach.c,v 1.10 1999/09/20 02:35:44 itojun 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 /* raise u bit to indicate that this is not globally unique */ 79 dst[0] |= 0x02; 80 break; 81 case 6: 82 dst[0] = src[0]; 83 dst[1] = src[1]; 84 dst[2] = src[2]; 85 dst[3] = 0xff; 86 dst[4] = 0xfe; 87 dst[5] = src[3]; 88 dst[6] = src[4]; 89 dst[7] = src[5]; 90 break; 91 case 8: 92 bcopy(src, dst, len); 93 break; 94 default: 95 return EINVAL; 96 } 97 98 return 0; 99 } 100 101 /* 102 * Find first ifid on list of interfaces. 103 * This is assumed that ifp0's interface token (for example, IEEE802 MAC) 104 * is globally unique. We may need to have a flag parameter in the future. 105 */ 106 int 107 in6_ifattach_getifid(ifp0) 108 struct ifnet *ifp0; 109 { 110 struct ifnet *ifp; 111 struct ifaddr *ifa; 112 u_int8_t *addr = NULL; 113 int addrlen = 0; 114 struct sockaddr_dl *sdl; 115 116 if (found_first_ifid) 117 return 0; 118 119 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 120 if (ifp0 != NULL && ifp0 != ifp) 121 continue; 122 for (ifa = ifp->if_addrlist.tqh_first; 123 ifa; 124 ifa = ifa->ifa_list.tqe_next) { 125 if (ifa->ifa_addr->sa_family != AF_LINK) 126 continue; 127 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 128 if (sdl == NULL) 129 continue; 130 if (sdl->sdl_alen == 0) 131 continue; 132 switch (ifp->if_type) { 133 case IFT_ETHER: 134 case IFT_FDDI: 135 case IFT_ATM: 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 case IFT_ARCNET: 147 /* 148 * ARCnet interface token cannot be used as 149 * globally unique identifier due to its 150 * small bitwidth. 151 */ 152 break; 153 default: 154 break; 155 } 156 } 157 } 158 #ifdef DEBUG 159 printf("in6_ifattach_getifid: failed to get EUI64"); 160 #endif 161 return EADDRNOTAVAIL; 162 163 found: 164 if (laddr_to_eui64(first_ifid, addr, addrlen) == 0) 165 found_first_ifid = 1; 166 167 if (found_first_ifid) { 168 printf("%s: supplying EUI64: " 169 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 170 ifp->if_xname, 171 first_ifid[0] & 0xff, first_ifid[1] & 0xff, 172 first_ifid[2] & 0xff, first_ifid[3] & 0xff, 173 first_ifid[4] & 0xff, first_ifid[5] & 0xff, 174 first_ifid[6] & 0xff, first_ifid[7] & 0xff); 175 176 /* invert u bit to convert EUI64 to RFC2373 interface ID. */ 177 first_ifid[0] ^= 0x02; 178 179 return 0; 180 } else { 181 #ifdef DEBUG 182 printf("in6_ifattach_getifid: failed to get EUI64"); 183 #endif 184 return EADDRNOTAVAIL; 185 } 186 } 187 188 /* 189 * add link-local address to *pseudo* p2p interfaces. 190 * get called when the first MAC address is made available in in6_ifattach(). 191 * 192 * XXX I start feeling this as a bad idea. (itojun) 193 */ 194 void 195 in6_ifattach_p2p() 196 { 197 struct ifnet *ifp; 198 199 /* prevent infinite loop. just in case. */ 200 if (found_first_ifid == 0) 201 return; 202 203 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 204 switch (ifp->if_type) { 205 case IFT_GIF: 206 /* pseudo interfaces - safe to initialize here */ 207 in6_ifattach(ifp, IN6_IFT_P2P, 0, 0); 208 break; 209 case IFT_FAITH: 210 /* this mistakingly becomes IFF_UP */ 211 break; 212 case IFT_SLIP: 213 /* IPv6 is not supported */ 214 break; 215 case IFT_PPP: 216 /* this is not a pseudo interface, skip it */ 217 break; 218 default: 219 break; 220 } 221 } 222 } 223 224 void 225 in6_ifattach(ifp, type, laddr, noloop) 226 struct ifnet *ifp; 227 u_int type; 228 caddr_t laddr; 229 /* size_t laddrlen; */ 230 int noloop; 231 { 232 static size_t if_indexlim = 8; 233 struct sockaddr_in6 mltaddr; 234 struct sockaddr_in6 mltmask; 235 struct sockaddr_in6 gate; 236 struct sockaddr_in6 mask; 237 238 struct in6_ifaddr *ia, *ib, *oia; 239 struct ifaddr *ifa; 240 int rtflag = 0; 241 242 if (type == IN6_IFT_P2P && found_first_ifid == 0) { 243 printf("%s: no ifid available for IPv6 link-local address\n", 244 ifp->if_xname); 245 return; 246 } 247 248 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 249 printf("%s: not multicast capable, IPv6 not enabled\n", 250 ifp->if_xname); 251 return; 252 } 253 254 /* 255 * We have some arrays that should be indexed by if_index. 256 * since if_index will grow dynamically, they should grow too. 257 * struct in6_addr **in6_iflladdr 258 */ 259 if (in6_iflladdr == NULL || if_index >= if_indexlim) { 260 size_t n; 261 caddr_t q; 262 size_t olim; 263 264 olim = if_indexlim; 265 while (if_index >= if_indexlim) 266 if_indexlim <<= 1; 267 268 /* grow in6_iflladdr */ 269 n = if_indexlim * sizeof(struct in6_addr *); 270 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); 271 bzero(q, n); 272 if (in6_iflladdr) { 273 bcopy((caddr_t)in6_iflladdr, q, 274 olim * sizeof(struct in6_addr *)); 275 free((caddr_t)in6_iflladdr, M_IFADDR); 276 } 277 in6_iflladdr = (struct in6_addr **)q; 278 } 279 280 /* 281 * To prevent to assign link-local address to PnP network 282 * cards multiple times. 283 * This is lengthy for P2P and LOOP but works. 284 */ 285 ifa = TAILQ_FIRST(&ifp->if_addrlist); 286 if (ifa != NULL) { 287 for ( ; ifa; ifa = TAILQ_NEXT(ifa, ifa_list)) { 288 if (ifa->ifa_addr->sa_family != AF_INET6) 289 continue; 290 if (IN6_IS_ADDR_LINKLOCAL(&satosin6(ifa->ifa_addr)->sin6_addr)) 291 return; 292 } 293 } else { 294 TAILQ_INIT(&ifp->if_addrlist); 295 } 296 297 /* 298 * link-local address 299 */ 300 ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_WAITOK); 301 bzero((caddr_t)ia, sizeof(*ia)); 302 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 303 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 304 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 305 ia->ia_ifp = ifp; 306 TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 307 /* 308 * Also link into the IPv6 address chain beginning with in6_ifaddr. 309 * kazu opposed it, but itojun & jinmei wanted. 310 */ 311 if ((oia = in6_ifaddr) != NULL) { 312 for (; oia->ia_next; oia = oia->ia_next) 313 continue; 314 oia->ia_next = ia; 315 } else 316 in6_ifaddr = ia; 317 318 ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 319 ia->ia_prefixmask.sin6_family = AF_INET6; 320 ia->ia_prefixmask.sin6_addr = in6mask64; 321 322 bzero(&ia->ia_addr, sizeof(struct sockaddr_in6)); 323 ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6); 324 ia->ia_addr.sin6_family = AF_INET6; 325 ia->ia_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 326 ia->ia_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 327 ia->ia_addr.sin6_addr.s6_addr32[1] = 0; 328 329 switch (type) { 330 case IN6_IFT_LOOP: 331 ia->ia_addr.sin6_addr.s6_addr32[2] = 0; 332 ia->ia_addr.sin6_addr.s6_addr32[3] = htonl(1); 333 break; 334 case IN6_IFT_802: 335 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 336 ia->ia_ifa.ifa_flags |= RTF_CLONING; 337 rtflag = RTF_CLONING; 338 /* fall through */ 339 case IN6_IFT_P2P802: 340 if (laddr == NULL) 341 break; 342 /* XXX use laddrlen */ 343 if (laddr_to_eui64(&ia->ia_addr.sin6_addr.s6_addr8[8], 344 laddr, 6) != 0) { 345 break; 346 } 347 /* invert u bit to convert EUI64 to RFC2373 interface ID. */ 348 ia->ia_addr.sin6_addr.s6_addr8[8] ^= 0x02; 349 if (found_first_ifid == 0) { 350 if (in6_ifattach_getifid(ifp) == 0) 351 in6_ifattach_p2p(); 352 } 353 break; 354 case IN6_IFT_P2P: 355 bcopy((caddr_t)first_ifid, 356 (caddr_t)&ia->ia_addr.sin6_addr.s6_addr8[8], 357 IFID_LEN); 358 break; 359 case IN6_IFT_ARCNET: 360 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 361 ia->ia_ifa.ifa_flags |= RTF_CLONING; 362 rtflag = RTF_CLONING; 363 if (laddr == NULL) 364 break; 365 if (laddr_to_eui64(&ia->ia_addr.sin6_addr.s6_addr8[8], 366 laddr, 1) != 0) { 367 break; 368 } 369 } 370 371 ia->ia_ifa.ifa_metric = ifp->if_metric; 372 373 if (ifp->if_ioctl != NULL) { 374 int s; 375 int error; 376 377 /* 378 * give the interface a chance to initialize, in case this 379 * is the first address to be added. 380 */ 381 s = splimp(); 382 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 383 splx(s); 384 385 if (error) { 386 switch (error) { 387 case EAFNOSUPPORT: 388 printf("%s: IPv6 not supported\n", 389 ifp->if_xname); 390 break; 391 default: 392 printf("%s: SIOCSIFADDR error %d\n", 393 ifp->if_xname, error); 394 break; 395 } 396 397 /* undo changes */ 398 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 399 if (oia) 400 oia->ia_next = ia->ia_next; 401 else 402 in6_ifaddr = ia->ia_next; 403 free(ia, M_IFADDR); 404 return; 405 } 406 } 407 408 /* add route to the interface. */ 409 rtrequest(RTM_ADD, 410 (struct sockaddr *)&ia->ia_addr, 411 (struct sockaddr *)&ia->ia_addr, 412 (struct sockaddr *)&ia->ia_prefixmask, 413 RTF_UP|rtflag, 414 (struct rtentry **)0); 415 ia->ia_flags |= IFA_ROUTE; 416 417 if (type == IN6_IFT_P2P || type == IN6_IFT_P2P802) { 418 /* 419 * route local address to loopback 420 */ 421 bzero(&gate, sizeof(gate)); 422 gate.sin6_len = sizeof(struct sockaddr_in6); 423 gate.sin6_family = AF_INET6; 424 gate.sin6_addr = in6addr_loopback; 425 bzero(&mask, sizeof(mask)); 426 mask.sin6_len = sizeof(struct sockaddr_in6); 427 mask.sin6_family = AF_INET6; 428 mask.sin6_addr = in6mask64; 429 rtrequest(RTM_ADD, 430 (struct sockaddr *)&ia->ia_addr, 431 (struct sockaddr *)&gate, 432 (struct sockaddr *)&mask, 433 RTF_UP|RTF_HOST, 434 (struct rtentry **)0); 435 } 436 437 /* 438 * loopback address 439 */ 440 ib = (struct in6_ifaddr *)NULL; 441 if (type == IN6_IFT_LOOP) { 442 ib = (struct in6_ifaddr *) 443 malloc(sizeof(*ib), M_IFADDR, M_WAITOK); 444 bzero((caddr_t)ib, sizeof(*ib)); 445 ib->ia_ifa.ifa_addr = (struct sockaddr *)&ib->ia_addr; 446 ib->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ib->ia_dstaddr; 447 ib->ia_ifa.ifa_netmask = (struct sockaddr *)&ib->ia_prefixmask; 448 ib->ia_ifp = ifp; 449 450 ia->ia_next = ib; 451 TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ib, 452 ifa_list); 453 454 ib->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 455 ib->ia_prefixmask.sin6_family = AF_INET6; 456 ib->ia_prefixmask.sin6_addr = in6mask128; 457 ib->ia_addr.sin6_len = sizeof(struct sockaddr_in6); 458 ib->ia_addr.sin6_family = AF_INET6; 459 ib->ia_addr.sin6_addr = in6addr_loopback; 460 #ifdef __bsdi__ 461 /* 462 * It is necessary to set the loopback address to the dstaddr 463 * field at least for BSDI. Without this setting, the BSDI 464 * version of ifa_ifwithroute() rejects to add a route 465 * to the loopback interface. 466 */ 467 ib->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 468 ib->ia_dstaddr.sin6_family = AF_INET6; 469 ib->ia_dstaddr.sin6_addr = in6addr_loopback; 470 #endif /* __bsdi__ */ 471 472 ib->ia_ifa.ifa_metric = ifp->if_metric; 473 474 rtrequest(RTM_ADD, 475 (struct sockaddr *)&ib->ia_addr, 476 (struct sockaddr *)&ib->ia_addr, 477 (struct sockaddr *)&ib->ia_prefixmask, 478 RTF_UP|RTF_HOST, 479 (struct rtentry **)0); 480 481 ib->ia_flags |= IFA_ROUTE; 482 } 483 484 /* 485 * join multicast 486 */ 487 if (ifp->if_flags & IFF_MULTICAST) { 488 int error; /* not used */ 489 490 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 491 /* Restore saved multicast addresses(if any). */ 492 in6_restoremkludge(ia, ifp); 493 #endif 494 495 bzero(&mltmask, sizeof(mltmask)); 496 mltmask.sin6_len = sizeof(struct sockaddr_in6); 497 mltmask.sin6_family = AF_INET6; 498 mltmask.sin6_addr = in6mask32; 499 500 /* 501 * join link-local all-nodes address 502 */ 503 bzero(&mltaddr, sizeof(mltaddr)); 504 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 505 mltaddr.sin6_family = AF_INET6; 506 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 507 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 508 rtrequest(RTM_ADD, 509 (struct sockaddr *)&mltaddr, 510 (struct sockaddr *)&ia->ia_addr, 511 (struct sockaddr *)&mltmask, 512 RTF_UP|RTF_CLONING, /* xxx */ 513 (struct rtentry **)0); 514 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 515 516 if (type == IN6_IFT_LOOP) { 517 /* 518 * join node-local all-nodes address 519 */ 520 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 521 rtrequest(RTM_ADD, 522 (struct sockaddr *)&mltaddr, 523 (struct sockaddr *)&ib->ia_addr, 524 (struct sockaddr *)&mltmask, 525 RTF_UP, 526 (struct rtentry **)0); 527 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 528 } else { 529 /* 530 * join solicited multicast address 531 */ 532 bzero(&llsol, sizeof(llsol)); 533 llsol.s6_addr16[0] = htons(0xff02); 534 llsol.s6_addr16[1] = htons(ifp->if_index); 535 llsol.s6_addr32[1] = 0; 536 llsol.s6_addr32[2] = htonl(1); 537 llsol.s6_addr32[3] = ia->ia_addr.sin6_addr.s6_addr32[3]; 538 llsol.s6_addr8[12] = 0xff; 539 (void)in6_addmulti(&llsol, ifp, &error); 540 } 541 } 542 543 /* update dynamically. */ 544 in6_iflladdr[ifp->if_index] = &ia->ia_addr.sin6_addr; 545 if (in6_maxmtu < ifp->if_mtu) 546 in6_maxmtu = ifp->if_mtu; 547 548 /* initialize NDP variables */ 549 nd6_ifattach(ifp); 550 551 /* mark the address TENTATIVE, if needed. */ 552 switch (ifp->if_type) { 553 case IFT_ARCNET: 554 case IFT_ETHER: 555 case IFT_FDDI: 556 #if 0 557 case IFT_ATM: 558 case IFT_SLIP: 559 case IFT_PPP: 560 #endif 561 ia->ia6_flags |= IN6_IFF_TENTATIVE; 562 /* nd6_dad_start() will be called in in6_if_up */ 563 break; 564 case IFT_GIF: 565 case IFT_LOOP: 566 case IFT_FAITH: 567 default: 568 break; 569 } 570 571 return; 572 } 573 574 void 575 in6_ifdetach(ifp) 576 struct ifnet *ifp; 577 { 578 struct in6_ifaddr *ia, *oia; 579 struct ifaddr *ifa; 580 struct rtentry *rt; 581 short rtflags; 582 583 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { 584 if (ifa->ifa_addr->sa_family != AF_INET6 585 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 586 continue; 587 } 588 589 ia = (struct in6_ifaddr *)ifa; 590 591 /* remove from the routing table */ 592 if ((ia->ia_flags & IFA_ROUTE) 593 && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) { 594 rtflags = rt->rt_flags; 595 rtfree(rt); 596 rtrequest(RTM_DELETE, 597 (struct sockaddr *)&ia->ia_addr, 598 (struct sockaddr *)&ia->ia_addr, 599 (struct sockaddr *)&ia->ia_prefixmask, 600 rtflags, (struct rtentry **)0); 601 } 602 603 /* remove from the linked list */ 604 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 605 606 /* also remove from the IPv6 address chain(itojun&jinmei) */ 607 oia = ia; 608 if (oia == (ia = in6_ifaddr)) 609 in6_ifaddr = ia->ia_next; 610 else { 611 while (ia->ia_next && (ia->ia_next != oia)) 612 ia = ia->ia_next; 613 if (ia->ia_next) 614 ia->ia_next = oia->ia_next; 615 #ifdef DEBUG 616 else 617 printf("%s: didn't unlink in6ifaddr from " 618 "list\n", ifp->if_xname); 619 #endif 620 } 621 622 free(ia, M_IFADDR); 623 } 624 } 625
Indexes created Tue Sep 23 14:10:03 GMT 2025