in6.c revision 1.23
1 /* $NetBSD: in6.c,v 1.23 2000/03/02 07:14:52 itojun Exp $ */ 2 /* $KAME: in6.c,v 1.56 2000/03/02 07:11:00 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 /* 34 * Copyright (c) 1982, 1986, 1991, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)in.c 8.2 (Berkeley) 11/15/93 66 */ 67 68 #include "opt_inet.h" 69 70 #include <sys/param.h> 71 #include <sys/ioctl.h> 72 #include <sys/errno.h> 73 #include <sys/malloc.h> 74 #include <sys/socket.h> 75 #include <sys/socketvar.h> 76 #include <sys/sockio.h> 77 #include <sys/systm.h> 78 #include <sys/proc.h> 79 #include <sys/time.h> 80 #include <sys/kernel.h> 81 #include <sys/syslog.h> 82 83 #include <net/if.h> 84 #include <net/if_types.h> 85 #include <net/route.h> 86 #include "gif.h" 87 #if NGIF > 0 88 #include <net/if_gif.h> 89 #endif 90 #include <net/if_dl.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_var.h> 94 #include <net/if_ether.h> 95 96 #include <netinet6/nd6.h> 97 #include <netinet/ip6.h> 98 #include <netinet6/ip6_var.h> 99 #include <netinet6/mld6_var.h> 100 #include <netinet6/ip6_mroute.h> 101 #include <netinet6/in6_ifattach.h> 102 103 #include <net/net_osdep.h> 104 105 /* enable backward compatibility code for obsoleted ioctls */ 106 #define COMPAT_IN6IFIOCTL 107 108 /* 109 * Definitions of some costant IP6 addresses. 110 */ 111 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 112 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 113 const struct in6_addr in6addr_nodelocal_allnodes = 114 IN6ADDR_NODELOCAL_ALLNODES_INIT; 115 const struct in6_addr in6addr_linklocal_allnodes = 116 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 117 const struct in6_addr in6addr_linklocal_allrouters = 118 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 119 120 const struct in6_addr in6mask0 = IN6MASK0; 121 const struct in6_addr in6mask32 = IN6MASK32; 122 const struct in6_addr in6mask64 = IN6MASK64; 123 const struct in6_addr in6mask96 = IN6MASK96; 124 const struct in6_addr in6mask128 = IN6MASK128; 125 126 static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t, 127 struct ifnet *, struct proc *)); 128 129 /* 130 * This structure is used to keep track of in6_multi chains which belong to 131 * deleted interface addresses. 132 */ 133 static LIST_HEAD(, multi6_kludge) in6_mk; /* XXX BSS initialization */ 134 135 struct multi6_kludge { 136 LIST_ENTRY(multi6_kludge) mk_entry; 137 struct ifnet *mk_ifp; 138 struct in6_multihead mk_head; 139 }; 140 141 /* 142 * Check if the loopback entry will be automatically generated. 143 * if 0 returned, will not be automatically generated. 144 * if 1 returned, will be automatically generated. 145 */ 146 static int 147 in6_is_ifloop_auto(struct ifaddr *ifa) 148 { 149 #define SIN6(s) ((struct sockaddr_in6 *)s) 150 /* 151 * If RTF_CLONING is unset, or (IFF_LOOPBACK | IFF_POINTOPOINT), 152 * or netmask is all0 or all1, then cloning will not happen, 153 * then we can't rely on its loopback entry generation. 154 */ 155 if ((ifa->ifa_flags & RTF_CLONING) == 0 || 156 (ifa->ifa_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) || 157 (SIN6(ifa->ifa_netmask)->sin6_len == sizeof(struct sockaddr_in6) 158 && 159 IN6_ARE_ADDR_EQUAL(&SIN6(ifa->ifa_netmask)->sin6_addr, 160 &in6mask128)) || 161 ((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_len == 0) 162 return 0; 163 else 164 return 1; 165 #undef SIN6 166 } 167 168 /* 169 * Subroutine for in6_ifaddloop() and in6_ifremloop(). 170 * This routine does actual work. 171 */ 172 static void 173 in6_ifloop_request(int cmd, struct ifaddr *ifa) 174 { 175 struct sockaddr_in6 lo_sa; 176 struct sockaddr_in6 all1_sa; 177 struct rtentry *nrt = NULL; 178 179 bzero(&lo_sa, sizeof(lo_sa)); 180 bzero(&all1_sa, sizeof(all1_sa)); 181 lo_sa.sin6_family = AF_INET6; 182 lo_sa.sin6_len = sizeof(struct sockaddr_in6); 183 all1_sa = lo_sa; 184 lo_sa.sin6_addr = in6addr_loopback; 185 all1_sa.sin6_addr = in6mask128; 186 187 /* So we add or remove static loopback entry, here. */ 188 rtrequest(cmd, ifa->ifa_addr, 189 (struct sockaddr *)&lo_sa, 190 (struct sockaddr *)&all1_sa, 191 RTF_UP|RTF_HOST, &nrt); 192 193 /* 194 * Make sure rt_ifa be equal to IFA, the second argument of the 195 * function. 196 * We need this because when we refer rt_ifa->ia6_flags in ip6_input, 197 * we assume that the rt_ifa points to the address instead of the 198 * loopback address. 199 */ 200 if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa) { 201 IFAFREE(nrt->rt_ifa); 202 IFAREF(ifa); 203 nrt->rt_ifa = ifa; 204 } 205 if (nrt) 206 nrt->rt_refcnt--; 207 } 208 209 /* 210 * Add ownaddr as loopback rtentry, if necessary(ex. on p2p link). 211 * Because, KAME needs loopback rtentry for ownaddr check in 212 * ip6_input(). 213 */ 214 static void 215 in6_ifaddloop(struct ifaddr *ifa) 216 { 217 if (!in6_is_ifloop_auto(ifa)) { 218 struct rtentry *rt; 219 220 /* If there is no loopback entry, allocate one. */ 221 rt = rtalloc1(ifa->ifa_addr, 0); 222 if (rt == 0 || (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) 223 in6_ifloop_request(RTM_ADD, ifa); 224 if (rt) 225 rt->rt_refcnt--; 226 } 227 } 228 229 /* 230 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), 231 * if it exists. 232 */ 233 static void 234 in6_ifremloop(struct ifaddr *ifa) 235 { 236 if (!in6_is_ifloop_auto(ifa)) { 237 struct in6_ifaddr *ia; 238 int ia_count = 0; 239 240 /* If only one ifa for the loopback entry, delete it. */ 241 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 242 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), 243 &ia->ia_addr.sin6_addr)) { 244 ia_count++; 245 if (ia_count > 1) 246 break; 247 } 248 } 249 if (ia_count == 1) 250 in6_ifloop_request(RTM_DELETE, ifa); 251 } 252 } 253 254 int 255 in6_ifindex2scopeid(idx) 256 int idx; 257 { 258 struct ifnet *ifp; 259 struct ifaddr *ifa; 260 struct sockaddr_in6 *sin6; 261 262 if (idx < 0 || if_index < idx) 263 return -1; 264 ifp = ifindex2ifnet[idx]; 265 266 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) 267 { 268 if (ifa->ifa_addr->sa_family != AF_INET6) 269 continue; 270 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 271 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) 272 return sin6->sin6_scope_id & 0xffff; 273 } 274 275 return -1; 276 } 277 278 int 279 in6_mask2len(mask) 280 struct in6_addr *mask; 281 { 282 int x, y; 283 284 for (x = 0; x < sizeof(*mask); x++) { 285 if (mask->s6_addr8[x] != 0xff) 286 break; 287 } 288 y = 0; 289 if (x < sizeof(*mask)) { 290 for (y = 0; y < 8; y++) { 291 if ((mask->s6_addr8[x] & (0x80 >> y)) == 0) 292 break; 293 } 294 } 295 return x * 8 + y; 296 } 297 298 void 299 in6_len2mask(mask, len) 300 struct in6_addr *mask; 301 int len; 302 { 303 int i; 304 305 bzero(mask, sizeof(*mask)); 306 for (i = 0; i < len / 8; i++) 307 mask->s6_addr8[i] = 0xff; 308 if (len % 8) 309 mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff; 310 } 311 312 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 313 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 314 315 int 316 in6_control(so, cmd, data, ifp, p) 317 struct socket *so; 318 u_long cmd; 319 caddr_t data; 320 struct ifnet *ifp; 321 struct proc *p; 322 { 323 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 324 struct in6_ifaddr *ia, *oia; 325 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 326 struct sockaddr_in6 oldaddr; 327 #ifdef COMPAT_IN6IFIOCTL 328 struct sockaddr_in6 net; 329 #endif 330 int error = 0, hostIsNew, prefixIsNew; 331 time_t time_second = (time_t)time.tv_sec; 332 int privileged; 333 334 privileged = 0; 335 if (p && !suser(p->p_ucred, &p->p_acflag)) 336 privileged++; 337 338 /* 339 * xxx should prevent processes for link-local addresses? 340 */ 341 #if NGIF > 0 342 if (ifp && ifp->if_type == IFT_GIF) { 343 switch (cmd) { 344 case SIOCSIFPHYADDR_IN6: 345 if (!privileged) 346 return(EPERM); 347 /*fall through*/ 348 case SIOCGIFPSRCADDR_IN6: 349 case SIOCGIFPDSTADDR_IN6: 350 return gif_ioctl(ifp, cmd, data); 351 } 352 } 353 #endif 354 switch (cmd) { 355 case SIOCGETSGCNT_IN6: 356 case SIOCGETMIFCNT_IN6: 357 return (mrt6_ioctl(cmd, data)); 358 } 359 360 if (ifp == NULL) 361 return(EOPNOTSUPP); 362 363 switch (cmd) { 364 case SIOCSNDFLUSH_IN6: 365 case SIOCSPFXFLUSH_IN6: 366 case SIOCSRTRFLUSH_IN6: 367 case SIOCSDEFIFACE_IN6: 368 if (!privileged) 369 return(EPERM); 370 /*fall through*/ 371 case SIOCGIFINFO_IN6: 372 case SIOCGDRLST_IN6: 373 case SIOCGPRLST_IN6: 374 case SIOCGNBRINFO_IN6: 375 case SIOCGDEFIFACE_IN6: 376 return(nd6_ioctl(cmd, data, ifp)); 377 } 378 379 switch (cmd) { 380 case SIOCSIFPREFIX_IN6: 381 case SIOCDIFPREFIX_IN6: 382 case SIOCAIFPREFIX_IN6: 383 case SIOCCIFPREFIX_IN6: 384 case SIOCSGIFPREFIX_IN6: 385 if (!privileged) 386 return(EPERM); 387 /*fall through*/ 388 case SIOCGIFPREFIX_IN6: 389 return(in6_prefix_ioctl(so, cmd, data, ifp)); 390 } 391 392 switch (cmd) { 393 case SIOCALIFADDR: 394 case SIOCDLIFADDR: 395 if (!privileged) 396 return(EPERM); 397 /*fall through*/ 398 case SIOCGLIFADDR: 399 return in6_lifaddr_ioctl(so, cmd, data, ifp, p); 400 } 401 402 /* 403 * Find address for this interface, if it exists. 404 */ 405 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */ 406 struct sockaddr_in6 *sa6 = 407 (struct sockaddr_in6 *)&ifra->ifra_addr; 408 409 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { 410 if (sa6->sin6_addr.s6_addr16[1] == 0) { 411 /* interface ID is not embedded by the user */ 412 sa6->sin6_addr.s6_addr16[1] = 413 htons(ifp->if_index); 414 } 415 else if (sa6->sin6_addr.s6_addr16[1] != 416 htons(ifp->if_index)) { 417 return(EINVAL); /* ifid is contradict */ 418 } 419 if (sa6->sin6_scope_id) { 420 if (sa6->sin6_scope_id != 421 (u_int32_t)ifp->if_index) 422 return(EINVAL); 423 sa6->sin6_scope_id = 0; /* XXX: good way? */ 424 } 425 } 426 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); 427 } 428 429 switch (cmd) { 430 431 case SIOCDIFADDR_IN6: 432 /* 433 * for IPv4, we look for existing in6_ifaddr here to allow 434 * "ifconfig if0 delete" to remove first IPv4 address on the 435 * interface. For IPv6, as the spec allow multiple interface 436 * address from the day one, we consider "remove the first one" 437 * semantics to be not preferrable. 438 */ 439 if (ia == NULL) 440 return(EADDRNOTAVAIL); 441 /* FALLTHROUGH */ 442 case SIOCAIFADDR_IN6: 443 case SIOCSIFADDR_IN6: 444 #ifdef COMPAT_IN6IFIOCTL 445 case SIOCSIFDSTADDR_IN6: 446 case SIOCSIFNETMASK_IN6: 447 /* 448 * Since IPv6 allows a node to assign multiple addresses 449 * on a single interface, SIOCSIFxxx ioctls are not suitable 450 * and should be unused. 451 */ 452 #endif 453 if (ifra->ifra_addr.sin6_family != AF_INET6) 454 return(EAFNOSUPPORT); 455 if (!privileged) 456 return(EPERM); 457 if (ia == NULL) { 458 ia = (struct in6_ifaddr *) 459 malloc(sizeof(*ia), M_IFADDR, M_WAITOK); 460 if (ia == NULL) 461 return (ENOBUFS); 462 bzero((caddr_t)ia, sizeof(*ia)); 463 /* Initialize the address and masks */ 464 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 465 ia->ia_addr.sin6_family = AF_INET6; 466 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 467 if (ifp->if_flags & IFF_POINTOPOINT) { 468 ia->ia_ifa.ifa_dstaddr 469 = (struct sockaddr *)&ia->ia_dstaddr; 470 ia->ia_dstaddr.sin6_family = AF_INET6; 471 ia->ia_dstaddr.sin6_len = sizeof(ia->ia_dstaddr); 472 } else { 473 ia->ia_ifa.ifa_dstaddr = NULL; 474 bzero(&ia->ia_dstaddr, sizeof(ia->ia_dstaddr)); 475 } 476 ia->ia_ifa.ifa_netmask 477 = (struct sockaddr *)&ia->ia_prefixmask; 478 479 ia->ia_ifp = ifp; 480 if ((oia = in6_ifaddr) != NULL) { 481 for ( ; oia->ia_next; oia = oia->ia_next) 482 continue; 483 oia->ia_next = ia; 484 } else 485 in6_ifaddr = ia; 486 IFAREF(&ia->ia_ifa); 487 488 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, 489 ifa_list); 490 IFAREF(&ia->ia_ifa); 491 } 492 493 if (cmd == SIOCAIFADDR_IN6) { 494 /* sanity for overflow - beware unsigned */ 495 struct in6_addrlifetime *lt; 496 lt = &ifra->ifra_lifetime; 497 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 498 && lt->ia6t_vltime + time_second < time_second) { 499 return EINVAL; 500 } 501 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 502 && lt->ia6t_pltime + time_second < time_second) { 503 return EINVAL; 504 } 505 } 506 break; 507 508 case SIOCGIFADDR_IN6: 509 /* This interface is basically deprecated. use SIOCGIFCONF. */ 510 /* fall through */ 511 case SIOCGIFAFLAG_IN6: 512 case SIOCGIFNETMASK_IN6: 513 case SIOCGIFDSTADDR_IN6: 514 case SIOCGIFALIFETIME_IN6: 515 /* must think again about its semantics */ 516 if (ia == NULL) 517 return(EADDRNOTAVAIL); 518 break; 519 case SIOCSIFALIFETIME_IN6: 520 { 521 struct in6_addrlifetime *lt; 522 523 if (!privileged) 524 return(EPERM); 525 if (ia == NULL) 526 return(EADDRNOTAVAIL); 527 /* sanity for overflow - beware unsigned */ 528 lt = &ifr->ifr_ifru.ifru_lifetime; 529 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 530 && lt->ia6t_vltime + time_second < time_second) { 531 return EINVAL; 532 } 533 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 534 && lt->ia6t_pltime + time_second < time_second) { 535 return EINVAL; 536 } 537 break; 538 } 539 } 540 541 switch (cmd) { 542 543 case SIOCGIFADDR_IN6: 544 ifr->ifr_addr = ia->ia_addr; 545 break; 546 547 case SIOCGIFDSTADDR_IN6: 548 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 549 return(EINVAL); 550 ifr->ifr_dstaddr = ia->ia_dstaddr; 551 break; 552 553 case SIOCGIFNETMASK_IN6: 554 ifr->ifr_addr = ia->ia_prefixmask; 555 break; 556 557 case SIOCGIFAFLAG_IN6: 558 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 559 break; 560 561 case SIOCGIFSTAT_IN6: 562 if (ifp == NULL) 563 return EINVAL; 564 if (in6_ifstat == NULL || ifp->if_index >= in6_ifstatmax 565 || in6_ifstat[ifp->if_index] == NULL) { 566 /* return EAFNOSUPPORT? */ 567 bzero(&ifr->ifr_ifru.ifru_stat, 568 sizeof(ifr->ifr_ifru.ifru_stat)); 569 } else 570 ifr->ifr_ifru.ifru_stat = *in6_ifstat[ifp->if_index]; 571 break; 572 573 case SIOCGIFSTAT_ICMP6: 574 if (ifp == NULL) 575 return EINVAL; 576 if (icmp6_ifstat == NULL || ifp->if_index >= icmp6_ifstatmax || 577 icmp6_ifstat[ifp->if_index] == NULL) { 578 /* return EAFNOSUPPORT? */ 579 bzero(&ifr->ifr_ifru.ifru_stat, 580 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 581 } else 582 ifr->ifr_ifru.ifru_icmp6stat = 583 *icmp6_ifstat[ifp->if_index]; 584 break; 585 586 #ifdef COMPAT_IN6IFIOCTL /* should be unused */ 587 case SIOCSIFDSTADDR_IN6: 588 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 589 return(EINVAL); 590 oldaddr = ia->ia_dstaddr; 591 ia->ia_dstaddr = ifr->ifr_dstaddr; 592 593 /* link-local index check */ 594 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_dstaddr.sin6_addr)) { 595 if (ia->ia_dstaddr.sin6_addr.s6_addr16[1] == 0) { 596 /* interface ID is not embedded by the user */ 597 ia->ia_dstaddr.sin6_addr.s6_addr16[1] 598 = htons(ifp->if_index); 599 } 600 else if (ia->ia_dstaddr.sin6_addr.s6_addr16[1] != 601 htons(ifp->if_index)) { 602 ia->ia_dstaddr = oldaddr; 603 return(EINVAL); /* ifid is contradict */ 604 } 605 } 606 607 if (ifp->if_ioctl && (error = (ifp->if_ioctl) 608 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { 609 ia->ia_dstaddr = oldaddr; 610 return(error); 611 } 612 if (ia->ia_flags & IFA_ROUTE) { 613 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 614 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 615 ia->ia_ifa.ifa_dstaddr = 616 (struct sockaddr *)&ia->ia_dstaddr; 617 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 618 } 619 break; 620 621 #endif 622 case SIOCGIFALIFETIME_IN6: 623 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 624 break; 625 626 case SIOCSIFALIFETIME_IN6: 627 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 628 /* for sanity */ 629 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 630 ia->ia6_lifetime.ia6t_expire = 631 time_second + ia->ia6_lifetime.ia6t_vltime; 632 } else 633 ia->ia6_lifetime.ia6t_expire = 0; 634 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 635 ia->ia6_lifetime.ia6t_preferred = 636 time_second + ia->ia6_lifetime.ia6t_pltime; 637 } else 638 ia->ia6_lifetime.ia6t_preferred = 0; 639 break; 640 641 case SIOCSIFADDR_IN6: 642 return(in6_ifinit(ifp, ia, &ifr->ifr_addr, 1)); 643 644 #ifdef COMPAT_IN6IFIOCTL /* XXX should be unused */ 645 case SIOCSIFNETMASK_IN6: 646 ia->ia_prefixmask = ifr->ifr_addr; 647 bzero(&net, sizeof(net)); 648 net.sin6_len = sizeof(struct sockaddr_in6); 649 net.sin6_family = AF_INET6; 650 net.sin6_port = htons(0); 651 net.sin6_flowinfo = htonl(0); 652 net.sin6_addr.s6_addr32[0] 653 = ia->ia_addr.sin6_addr.s6_addr32[0] & 654 ia->ia_prefixmask.sin6_addr.s6_addr32[0]; 655 net.sin6_addr.s6_addr32[1] 656 = ia->ia_addr.sin6_addr.s6_addr32[1] & 657 ia->ia_prefixmask.sin6_addr.s6_addr32[1]; 658 net.sin6_addr.s6_addr32[2] 659 = ia->ia_addr.sin6_addr.s6_addr32[2] & 660 ia->ia_prefixmask.sin6_addr.s6_addr32[2]; 661 net.sin6_addr.s6_addr32[3] 662 = ia->ia_addr.sin6_addr.s6_addr32[3] & 663 ia->ia_prefixmask.sin6_addr.s6_addr32[3]; 664 ia->ia_net = net; 665 break; 666 #endif 667 668 case SIOCAIFADDR_IN6: 669 prefixIsNew = 0; 670 hostIsNew = 1; 671 672 if (ifra->ifra_addr.sin6_len == 0) { 673 ifra->ifra_addr = ia->ia_addr; 674 hostIsNew = 0; 675 } else if (IN6_ARE_ADDR_EQUAL(&ifra->ifra_addr.sin6_addr, 676 &ia->ia_addr.sin6_addr)) 677 hostIsNew = 0; 678 679 /* Validate address families: */ 680 /* 681 * The destination address for a p2p link must have a family 682 * of AF_UNSPEC or AF_INET6. 683 */ 684 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 685 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 686 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 687 return(EAFNOSUPPORT); 688 /* 689 * The prefixmask must have a family of AF_UNSPEC or AF_INET6. 690 */ 691 if (ifra->ifra_prefixmask.sin6_family != AF_INET6 && 692 ifra->ifra_prefixmask.sin6_family != AF_UNSPEC) 693 return(EAFNOSUPPORT); 694 695 if (ifra->ifra_prefixmask.sin6_len) { 696 in6_ifscrub(ifp, ia); 697 ia->ia_prefixmask = ifra->ifra_prefixmask; 698 prefixIsNew = 1; 699 } 700 if ((ifp->if_flags & IFF_POINTOPOINT) && 701 (ifra->ifra_dstaddr.sin6_family == AF_INET6)) { 702 in6_ifscrub(ifp, ia); 703 oldaddr = ia->ia_dstaddr; 704 ia->ia_dstaddr = ifra->ifra_dstaddr; 705 /* link-local index check: should be a separate function? */ 706 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_dstaddr.sin6_addr)) { 707 if (ia->ia_dstaddr.sin6_addr.s6_addr16[1] == 0) { 708 /* 709 * interface ID is not embedded by 710 * the user 711 */ 712 ia->ia_dstaddr.sin6_addr.s6_addr16[1] 713 = htons(ifp->if_index); 714 } else if (ia->ia_dstaddr.sin6_addr.s6_addr16[1] != 715 htons(ifp->if_index)) { 716 ia->ia_dstaddr = oldaddr; 717 return(EINVAL); /* ifid is contradict */ 718 } 719 } 720 prefixIsNew = 1; /* We lie; but effect's the same */ 721 } 722 if (hostIsNew || prefixIsNew) 723 error = in6_ifinit(ifp, ia, &ifra->ifra_addr, 0); 724 if (hostIsNew && (ifp->if_flags & IFF_MULTICAST)) { 725 int error_local = 0; 726 727 /* 728 * join solicited multicast addr for new host id 729 */ 730 struct in6_addr llsol; 731 bzero(&llsol, sizeof(struct in6_addr)); 732 llsol.s6_addr16[0] = htons(0xff02); 733 llsol.s6_addr16[1] = htons(ifp->if_index); 734 llsol.s6_addr32[1] = 0; 735 llsol.s6_addr32[2] = htonl(1); 736 llsol.s6_addr32[3] = 737 ifra->ifra_addr.sin6_addr.s6_addr32[3]; 738 llsol.s6_addr8[12] = 0xff; 739 (void)in6_addmulti(&llsol, ifp, &error_local); 740 if (error == 0) 741 error = error_local; 742 } 743 744 ia->ia6_flags = ifra->ifra_flags; 745 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/ 746 747 ia->ia6_lifetime = ifra->ifra_lifetime; 748 /* for sanity */ 749 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 750 ia->ia6_lifetime.ia6t_expire = 751 time_second + ia->ia6_lifetime.ia6t_vltime; 752 } else 753 ia->ia6_lifetime.ia6t_expire = 0; 754 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 755 ia->ia6_lifetime.ia6t_preferred = 756 time_second + ia->ia6_lifetime.ia6t_pltime; 757 } else 758 ia->ia6_lifetime.ia6t_preferred = 0; 759 760 /* 761 * Perform DAD, if needed. 762 * XXX It may be of use, if we can administratively 763 * disable DAD. 764 */ 765 switch (ifp->if_type) { 766 case IFT_ARCNET: 767 case IFT_ETHER: 768 case IFT_FDDI: 769 #if 0 770 case IFT_ATM: 771 case IFT_SLIP: 772 case IFT_PPP: 773 #endif 774 ia->ia6_flags |= IN6_IFF_TENTATIVE; 775 nd6_dad_start(&ia->ia_ifa, NULL); 776 break; 777 case IFT_FAITH: 778 case IFT_GIF: 779 case IFT_LOOP: 780 default: 781 break; 782 } 783 784 if (hostIsNew) { 785 int iilen; 786 int error_local = 0; 787 788 iilen = (sizeof(ia->ia_prefixmask.sin6_addr) << 3) - 789 in6_mask2len(&ia->ia_prefixmask.sin6_addr); 790 error_local = in6_prefix_add_ifid(iilen, ia); 791 if (error == 0) 792 error = error_local; 793 } 794 795 return(error); 796 797 case SIOCDIFADDR_IN6: 798 in6_purgeaddr(&ia->ia_ifa, ifp); 799 break; 800 801 default: 802 if (ifp == NULL || ifp->if_ioctl == 0) 803 return(EOPNOTSUPP); 804 return((*ifp->if_ioctl)(ifp, cmd, data)); 805 } 806 return(0); 807 } 808 809 void 810 in6_purgeaddr(ifa, ifp) 811 struct ifaddr *ifa; 812 struct ifnet *ifp; 813 { 814 struct in6_ifaddr *oia, *ia = (void *) ifa; 815 816 in6_ifscrub(ifp, ia); 817 818 if (ifp->if_flags & IFF_MULTICAST) { 819 /* 820 * delete solicited multicast addr for deleting host id 821 */ 822 struct in6_multi *in6m; 823 struct in6_addr llsol; 824 bzero(&llsol, sizeof(struct in6_addr)); 825 llsol.s6_addr16[0] = htons(0xff02); 826 llsol.s6_addr16[1] = htons(ifp->if_index); 827 llsol.s6_addr32[1] = 0; 828 llsol.s6_addr32[2] = htonl(1); 829 llsol.s6_addr32[3] = 830 ia->ia_addr.sin6_addr.s6_addr32[3]; 831 llsol.s6_addr8[12] = 0xff; 832 833 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 834 if (in6m) 835 in6_delmulti(in6m); 836 } 837 838 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 839 IFAFREE(&ia->ia_ifa); 840 841 oia = ia; 842 if (oia == (ia = in6_ifaddr)) 843 in6_ifaddr = ia->ia_next; 844 else { 845 while (ia->ia_next && (ia->ia_next != oia)) 846 ia = ia->ia_next; 847 if (ia->ia_next) 848 ia->ia_next = oia->ia_next; 849 else 850 printf("Didn't unlink in6_ifaddr from list\n"); 851 } 852 { 853 int iilen; 854 855 iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - 856 in6_mask2len(&oia->ia_prefixmask.sin6_addr); 857 in6_prefix_remove_ifid(iilen, oia); 858 } 859 if (oia->ia6_multiaddrs.lh_first != NULL) { 860 /* 861 * XXX thorpej (at) netbsd.org -- if the interface is going 862 * XXX away, don't save the multicast entries, delete them! 863 */ 864 if (oia->ia_ifa.ifa_ifp->if_output == if_nulloutput) { 865 struct in6_multi *in6m; 866 867 while ((in6m = 868 LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) 869 in6_delmulti(in6m); 870 } else 871 in6_savemkludge(oia); 872 } 873 874 IFAFREE(&oia->ia_ifa); 875 } 876 877 void 878 in6_purgeif(ifp) 879 struct ifnet *ifp; 880 { 881 struct ifaddr *ifa, *nifa; 882 883 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) { 884 nifa = TAILQ_NEXT(ifa, ifa_list); 885 if (ifa->ifa_addr->sa_family != AF_INET6) 886 continue; 887 in6_purgeaddr(ifa, ifp); 888 } 889 890 in6_ifdetach(ifp); 891 } 892 893 /* 894 * SIOC[GAD]LIFADDR. 895 * SIOCGLIFADDR: get first address. (???) 896 * SIOCGLIFADDR with IFLR_PREFIX: 897 * get first address that matches the specified prefix. 898 * SIOCALIFADDR: add the specified address. 899 * SIOCALIFADDR with IFLR_PREFIX: 900 * add the specified prefix, filling hostid part from 901 * the first link-local address. prefixlen must be <= 64. 902 * SIOCDLIFADDR: delete the specified address. 903 * SIOCDLIFADDR with IFLR_PREFIX: 904 * delete the first address that matches the specified prefix. 905 * return values: 906 * EINVAL on invalid parameters 907 * EADDRNOTAVAIL on prefix match failed/specified address not found 908 * other values may be returned from in6_ioctl() 909 * 910 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 911 * this is to accomodate address naming scheme other than RFC2374, 912 * in the future. 913 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 914 * address encoding scheme. (see figure on page 8) 915 */ 916 static int 917 in6_lifaddr_ioctl(so, cmd, data, ifp, p) 918 struct socket *so; 919 u_long cmd; 920 caddr_t data; 921 struct ifnet *ifp; 922 struct proc *p; 923 { 924 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 925 struct ifaddr *ifa; 926 struct sockaddr *sa; 927 928 /* sanity checks */ 929 if (!data || !ifp) { 930 panic("invalid argument to in6_lifaddr_ioctl"); 931 /*NOTRECHED*/ 932 } 933 934 switch (cmd) { 935 case SIOCGLIFADDR: 936 /* address must be specified on GET with IFLR_PREFIX */ 937 if ((iflr->flags & IFLR_PREFIX) == 0) 938 break; 939 /*FALLTHROUGH*/ 940 case SIOCALIFADDR: 941 case SIOCDLIFADDR: 942 /* address must be specified on ADD and DELETE */ 943 sa = (struct sockaddr *)&iflr->addr; 944 if (sa->sa_family != AF_INET6) 945 return EINVAL; 946 if (sa->sa_len != sizeof(struct sockaddr_in6)) 947 return EINVAL; 948 /* XXX need improvement */ 949 sa = (struct sockaddr *)&iflr->dstaddr; 950 if (sa->sa_family && sa->sa_family != AF_INET6) 951 return EINVAL; 952 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 953 return EINVAL; 954 break; 955 default: /*shouldn't happen*/ 956 #if 0 957 panic("invalid cmd to in6_lifaddr_ioctl"); 958 /*NOTREACHED*/ 959 #else 960 return EOPNOTSUPP; 961 #endif 962 } 963 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 964 return EINVAL; 965 966 switch (cmd) { 967 case SIOCALIFADDR: 968 { 969 struct in6_aliasreq ifra; 970 struct in6_addr *hostid = NULL; 971 int prefixlen; 972 973 if ((iflr->flags & IFLR_PREFIX) != 0) { 974 struct sockaddr_in6 *sin6; 975 976 /* 977 * hostid is to fill in the hostid part of the 978 * address. hostid points to the first link-local 979 * address attached to the interface. 980 */ 981 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 982 if (!ifa) 983 return EADDRNOTAVAIL; 984 hostid = IFA_IN6(ifa); 985 986 /* prefixlen must be <= 64. */ 987 if (64 < iflr->prefixlen) 988 return EINVAL; 989 prefixlen = iflr->prefixlen; 990 991 /* hostid part must be zero. */ 992 sin6 = (struct sockaddr_in6 *)&iflr->addr; 993 if (sin6->sin6_addr.s6_addr32[2] != 0 994 || sin6->sin6_addr.s6_addr32[3] != 0) { 995 return EINVAL; 996 } 997 } else 998 prefixlen = iflr->prefixlen; 999 1000 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1001 bzero(&ifra, sizeof(ifra)); 1002 bcopy(iflr->iflr_name, ifra.ifra_name, 1003 sizeof(ifra.ifra_name)); 1004 1005 bcopy(&iflr->addr, &ifra.ifra_addr, 1006 ((struct sockaddr *)&iflr->addr)->sa_len); 1007 if (hostid) { 1008 /* fill in hostid part */ 1009 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1010 hostid->s6_addr32[2]; 1011 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1012 hostid->s6_addr32[3]; 1013 } 1014 1015 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 1016 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1017 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1018 if (hostid) { 1019 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1020 hostid->s6_addr32[2]; 1021 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1022 hostid->s6_addr32[3]; 1023 } 1024 } 1025 1026 ifra.ifra_prefixmask.sin6_family = AF_INET6; 1027 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1028 in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1029 1030 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1031 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, p); 1032 } 1033 case SIOCGLIFADDR: 1034 case SIOCDLIFADDR: 1035 { 1036 struct in6_ifaddr *ia; 1037 struct in6_addr mask, candidate, match; 1038 struct sockaddr_in6 *sin6; 1039 int cmp; 1040 1041 bzero(&mask, sizeof(mask)); 1042 if (iflr->flags & IFLR_PREFIX) { 1043 /* lookup a prefix rather than address. */ 1044 in6_len2mask(&mask, iflr->prefixlen); 1045 1046 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1047 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1048 match.s6_addr32[0] &= mask.s6_addr32[0]; 1049 match.s6_addr32[1] &= mask.s6_addr32[1]; 1050 match.s6_addr32[2] &= mask.s6_addr32[2]; 1051 match.s6_addr32[3] &= mask.s6_addr32[3]; 1052 1053 /* if you set extra bits, that's wrong */ 1054 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1055 return EINVAL; 1056 1057 cmp = 1; 1058 } else { 1059 if (cmd == SIOCGLIFADDR) { 1060 /* on getting an address, take the 1st match */ 1061 cmp = 0; /*XXX*/ 1062 } else { 1063 /* on deleting an address, do exact match */ 1064 in6_len2mask(&mask, 128); 1065 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1066 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1067 1068 cmp = 1; 1069 } 1070 } 1071 1072 for (ifa = ifp->if_addrlist.tqh_first; 1073 ifa; 1074 ifa = ifa->ifa_list.tqe_next) 1075 { 1076 if (ifa->ifa_addr->sa_family != AF_INET6) 1077 continue; 1078 if (!cmp) 1079 break; 1080 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1081 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1082 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1083 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1084 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1085 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1086 break; 1087 } 1088 if (!ifa) 1089 return EADDRNOTAVAIL; 1090 ia = ifa2ia6(ifa); 1091 1092 if (cmd == SIOCGLIFADDR) { 1093 /* fill in the if_laddrreq structure */ 1094 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1095 1096 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1097 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1098 ia->ia_dstaddr.sin6_len); 1099 } else 1100 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1101 1102 iflr->prefixlen = 1103 in6_mask2len(&ia->ia_prefixmask.sin6_addr); 1104 1105 iflr->flags = ia->ia6_flags; /*XXX*/ 1106 1107 return 0; 1108 } else { 1109 struct in6_aliasreq ifra; 1110 1111 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1112 bzero(&ifra, sizeof(ifra)); 1113 bcopy(iflr->iflr_name, ifra.ifra_name, 1114 sizeof(ifra.ifra_name)); 1115 1116 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1117 ia->ia_addr.sin6_len); 1118 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1119 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1120 ia->ia_dstaddr.sin6_len); 1121 } else { 1122 bzero(&ifra.ifra_dstaddr, 1123 sizeof(ifra.ifra_dstaddr)); 1124 } 1125 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1126 ia->ia_prefixmask.sin6_len); 1127 1128 ifra.ifra_flags = ia->ia6_flags; 1129 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1130 ifp, p); 1131 } 1132 } 1133 } 1134 1135 return EOPNOTSUPP; /*just for safety*/ 1136 } 1137 1138 /* 1139 * Delete any existing route for an interface. 1140 */ 1141 void 1142 in6_ifscrub(ifp, ia) 1143 register struct ifnet *ifp; 1144 register struct in6_ifaddr *ia; 1145 { 1146 if ((ia->ia_flags & IFA_ROUTE) == 0) 1147 return; 1148 if (ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) 1149 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 1150 else 1151 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); 1152 ia->ia_flags &= ~IFA_ROUTE; 1153 1154 /* Remove ownaddr's loopback rtentry, if it exists. */ 1155 in6_ifremloop(&(ia->ia_ifa)); 1156 } 1157 1158 /* 1159 * Initialize an interface's intetnet6 address 1160 * and routing table entry. 1161 */ 1162 int 1163 in6_ifinit(ifp, ia, sin6, scrub) 1164 struct ifnet *ifp; 1165 struct in6_ifaddr *ia; 1166 struct sockaddr_in6 *sin6; 1167 int scrub; 1168 { 1169 struct sockaddr_in6 oldaddr; 1170 int error, flags = RTF_UP; 1171 int s = splimp(); 1172 1173 oldaddr = ia->ia_addr; 1174 ia->ia_addr = *sin6; 1175 /* 1176 * Give the interface a chance to initialize 1177 * if this is its first address, 1178 * and to validate the address if necessary. 1179 */ 1180 if (ifp->if_ioctl && 1181 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 1182 splx(s); 1183 ia->ia_addr = oldaddr; 1184 return(error); 1185 } 1186 1187 switch (ifp->if_type) { 1188 case IFT_ARCNET: 1189 case IFT_ETHER: 1190 case IFT_FDDI: 1191 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1192 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1193 break; 1194 case IFT_PPP: 1195 ia->ia_ifa.ifa_rtrequest = nd6_p2p_rtrequest; 1196 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1197 break; 1198 } 1199 1200 splx(s); 1201 if (scrub) { 1202 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 1203 in6_ifscrub(ifp, ia); 1204 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1205 } 1206 /* xxx 1207 * in_socktrim 1208 */ 1209 /* 1210 * Add route for the network. 1211 */ 1212 ia->ia_ifa.ifa_metric = ifp->if_metric; 1213 if (ifp->if_flags & IFF_LOOPBACK) { 1214 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 1215 flags |= RTF_HOST; 1216 } else if (ifp->if_flags & IFF_POINTOPOINT) { 1217 if (ia->ia_dstaddr.sin6_family != AF_INET6) 1218 return(0); 1219 flags |= RTF_HOST; 1220 } 1221 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0) 1222 ia->ia_flags |= IFA_ROUTE; 1223 1224 /* Add ownaddr as loopback rtentry, if necessary(ex. on p2p link). */ 1225 in6_ifaddloop(&(ia->ia_ifa)); 1226 1227 if (ifp->if_flags & IFF_MULTICAST) 1228 in6_restoremkludge(ia, ifp); 1229 1230 return(error); 1231 } 1232 1233 /* 1234 * Multicast address kludge: 1235 * If there were any multicast addresses attached to this interface address, 1236 * either move them to another address on this interface, or save them until 1237 * such time as this interface is reconfigured for IPv6. 1238 */ 1239 void 1240 in6_savemkludge(oia) 1241 struct in6_ifaddr *oia; 1242 { 1243 struct in6_ifaddr *ia; 1244 struct in6_multi *in6m, *next; 1245 1246 IFP_TO_IA6(oia->ia_ifp, ia); 1247 if (ia) { /* there is another address */ 1248 for (in6m = oia->ia6_multiaddrs.lh_first; in6m; in6m = next){ 1249 next = in6m->in6m_entry.le_next; 1250 IFAFREE(&in6m->in6m_ia->ia_ifa); 1251 IFAREF(&ia->ia_ifa); 1252 in6m->in6m_ia = ia; 1253 LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); 1254 } 1255 } else { /* last address on this if deleted, save */ 1256 struct multi6_kludge *mk; 1257 1258 mk = malloc(sizeof(*mk), M_IPMADDR, M_WAITOK); 1259 1260 LIST_INIT(&mk->mk_head); 1261 mk->mk_ifp = oia->ia_ifp; 1262 1263 for (in6m = oia->ia6_multiaddrs.lh_first; in6m; in6m = next){ 1264 next = in6m->in6m_entry.le_next; 1265 IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */ 1266 in6m->in6m_ia = NULL; 1267 LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry); 1268 } 1269 1270 if (mk->mk_head.lh_first != NULL) { 1271 LIST_INSERT_HEAD(&in6_mk, mk, mk_entry); 1272 } 1273 else { 1274 FREE(mk, M_IPMADDR); 1275 } 1276 } 1277 } 1278 1279 /* 1280 * Continuation of multicast address hack: 1281 * If there was a multicast group list previously saved for this interface, 1282 * then we re-attach it to the first address configured on the i/f. 1283 */ 1284 void 1285 in6_restoremkludge(ia, ifp) 1286 struct in6_ifaddr *ia; 1287 struct ifnet *ifp; 1288 { 1289 struct multi6_kludge *mk; 1290 1291 for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) { 1292 if (mk->mk_ifp == ifp) { 1293 struct in6_multi *in6m, *next; 1294 1295 for (in6m = mk->mk_head.lh_first; in6m; in6m = next){ 1296 next = in6m->in6m_entry.le_next; 1297 in6m->in6m_ia = ia; 1298 IFAREF(&ia->ia_ifa); /* gain a reference */ 1299 LIST_INSERT_HEAD(&ia->ia6_multiaddrs, 1300 in6m, in6m_entry); 1301 } 1302 LIST_REMOVE(mk, mk_entry); 1303 free(mk, M_IPMADDR); 1304 break; 1305 } 1306 } 1307 } 1308 1309 void 1310 in6_purgemkludge(ifp) 1311 struct ifnet *ifp; 1312 { 1313 struct multi6_kludge *mk; 1314 struct in6_multi *in6m; 1315 1316 for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) { 1317 if (mk->mk_ifp != ifp) 1318 continue; 1319 1320 /* leave from all multicast groups joined */ 1321 while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL) 1322 in6_delmulti(in6m); 1323 LIST_REMOVE(mk, mk_entry); 1324 free(mk, M_IPMADDR); 1325 break; 1326 } 1327 } 1328 1329 /* 1330 * Add an address to the list of IP6 multicast addresses for a 1331 * given interface. 1332 */ 1333 struct in6_multi * 1334 in6_addmulti(maddr6, ifp, errorp) 1335 register struct in6_addr *maddr6; 1336 register struct ifnet *ifp; 1337 int *errorp; 1338 { 1339 struct in6_ifaddr *ia; 1340 struct in6_ifreq ifr; 1341 struct in6_multi *in6m; 1342 int s = splsoftnet(); 1343 1344 *errorp = 0; 1345 /* 1346 * See if address already in list. 1347 */ 1348 IN6_LOOKUP_MULTI(*maddr6, ifp, in6m); 1349 if (in6m != NULL) { 1350 /* 1351 * Found it; just increment the refrence count. 1352 */ 1353 in6m->in6m_refcount++; 1354 } else { 1355 /* 1356 * New address; allocate a new multicast record 1357 * and link it into the interface's multicast list. 1358 */ 1359 in6m = (struct in6_multi *) 1360 malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); 1361 if (in6m == NULL) { 1362 splx(s); 1363 *errorp = ENOBUFS; 1364 return(NULL); 1365 } 1366 in6m->in6m_addr = *maddr6; 1367 in6m->in6m_ifp = ifp; 1368 in6m->in6m_refcount = 1; 1369 IFP_TO_IA6(ifp, ia); 1370 if (ia == NULL) { 1371 free(in6m, M_IPMADDR); 1372 splx(s); 1373 *errorp = EADDRNOTAVAIL; /* appropriate? */ 1374 return(NULL); 1375 } 1376 in6m->in6m_ia = ia; 1377 IFAREF(&ia->ia_ifa); /* gain a reference */ 1378 LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); 1379 1380 /* 1381 * Ask the network driver to update its multicast reception 1382 * filter appropriately for the new address. 1383 */ 1384 bzero(&ifr.ifr_addr, sizeof(struct sockaddr_in6)); 1385 ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6); 1386 ifr.ifr_addr.sin6_family = AF_INET6; 1387 ifr.ifr_addr.sin6_addr = *maddr6; 1388 if (ifp->if_ioctl == NULL) 1389 *errorp = ENXIO; /* XXX: appropriate? */ 1390 else 1391 *errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 1392 (caddr_t)&ifr); 1393 if (*errorp) { 1394 LIST_REMOVE(in6m, in6m_entry); 1395 free(in6m, M_IPMADDR); 1396 splx(s); 1397 return(NULL); 1398 } 1399 /* 1400 * Let MLD6 know that we have joined a new IP6 multicast 1401 * group. 1402 */ 1403 mld6_start_listening(in6m); 1404 } 1405 splx(s); 1406 return(in6m); 1407 } 1408 1409 /* 1410 * Delete a multicast address record. 1411 */ 1412 void 1413 in6_delmulti(in6m) 1414 struct in6_multi *in6m; 1415 { 1416 struct in6_ifreq ifr; 1417 int s = splsoftnet(); 1418 1419 if (--in6m->in6m_refcount == 0) { 1420 /* 1421 * No remaining claims to this record; let MLD6 know 1422 * that we are leaving the multicast group. 1423 */ 1424 mld6_stop_listening(in6m); 1425 1426 /* 1427 * Unlink from list. 1428 */ 1429 LIST_REMOVE(in6m, in6m_entry); 1430 if (in6m->in6m_ia) 1431 IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */ 1432 1433 /* 1434 * Notify the network driver to update its multicast 1435 * reception filter. 1436 */ 1437 bzero(&ifr.ifr_addr, sizeof(struct sockaddr_in6)); 1438 ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6); 1439 ifr.ifr_addr.sin6_family = AF_INET6; 1440 ifr.ifr_addr.sin6_addr = in6m->in6m_addr; 1441 (*in6m->in6m_ifp->if_ioctl)(in6m->in6m_ifp, 1442 SIOCDELMULTI, (caddr_t)&ifr); 1443 free(in6m, M_IPMADDR); 1444 } 1445 splx(s); 1446 } 1447 1448 /* 1449 * Find an IPv6 interface link-local address specific to an interface. 1450 */ 1451 struct in6_ifaddr * 1452 in6ifa_ifpforlinklocal(ifp, ignoreflags) 1453 struct ifnet *ifp; 1454 int ignoreflags; 1455 { 1456 register struct ifaddr *ifa; 1457 1458 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) 1459 { 1460 if (ifa->ifa_addr == NULL) 1461 continue; /* just for safety */ 1462 if (ifa->ifa_addr->sa_family != AF_INET6) 1463 continue; 1464 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1465 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1466 ignoreflags) != 0) 1467 continue; 1468 break; 1469 } 1470 } 1471 1472 return((struct in6_ifaddr *)ifa); 1473 } 1474 1475 1476 /* 1477 * find the internet address corresponding to a given interface and address. 1478 */ 1479 struct in6_ifaddr * 1480 in6ifa_ifpwithaddr(ifp, addr) 1481 struct ifnet *ifp; 1482 struct in6_addr *addr; 1483 { 1484 register struct ifaddr *ifa; 1485 1486 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) 1487 { 1488 if (ifa->ifa_addr == NULL) 1489 continue; /* just for safety */ 1490 if (ifa->ifa_addr->sa_family != AF_INET6) 1491 continue; 1492 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1493 break; 1494 } 1495 1496 return((struct in6_ifaddr *)ifa); 1497 } 1498 1499 /* 1500 * Convert IP6 address to printable (loggable) representation. 1501 */ 1502 static char digits[] = "0123456789abcdef"; 1503 static int ip6round = 0; 1504 char * 1505 ip6_sprintf(addr) 1506 register struct in6_addr *addr; 1507 { 1508 static char ip6buf[8][48]; 1509 register int i; 1510 register char *cp; 1511 register u_short *a = (u_short *)addr; 1512 register u_char *d; 1513 int dcolon = 0; 1514 1515 ip6round = (ip6round + 1) & 7; 1516 cp = ip6buf[ip6round]; 1517 1518 for (i = 0; i < 8; i++) { 1519 if (dcolon == 1) { 1520 if (*a == 0) { 1521 if (i == 7) 1522 *cp++ = ':'; 1523 a++; 1524 continue; 1525 } else 1526 dcolon = 2; 1527 } 1528 if (*a == 0) { 1529 if (dcolon == 0 && *(a + 1) == 0) { 1530 if (i == 0) 1531 *cp++ = ':'; 1532 *cp++ = ':'; 1533 dcolon = 1; 1534 } else { 1535 *cp++ = '0'; 1536 *cp++ = ':'; 1537 } 1538 a++; 1539 continue; 1540 } 1541 d = (u_char *)a; 1542 *cp++ = digits[*d >> 4]; 1543 *cp++ = digits[*d++ & 0xf]; 1544 *cp++ = digits[*d >> 4]; 1545 *cp++ = digits[*d & 0xf]; 1546 *cp++ = ':'; 1547 a++; 1548 } 1549 *--cp = 0; 1550 return(ip6buf[ip6round]); 1551 } 1552 1553 int 1554 in6_localaddr(in6) 1555 struct in6_addr *in6; 1556 { 1557 struct in6_ifaddr *ia; 1558 1559 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1560 return 1; 1561 1562 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1563 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1564 &ia->ia_prefixmask.sin6_addr)) 1565 return 1; 1566 1567 return (0); 1568 } 1569 1570 /* 1571 * Get a scope of the address. Node-local, link-local, site-local or global. 1572 */ 1573 int 1574 in6_addrscope (addr) 1575 struct in6_addr *addr; 1576 { 1577 int scope; 1578 1579 if (addr->s6_addr8[0] == 0xfe) { 1580 scope = addr->s6_addr8[1] & 0xc0; 1581 1582 switch (scope) { 1583 case 0x80: 1584 return IPV6_ADDR_SCOPE_LINKLOCAL; 1585 break; 1586 case 0xc0: 1587 return IPV6_ADDR_SCOPE_SITELOCAL; 1588 break; 1589 default: 1590 return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */ 1591 break; 1592 } 1593 } 1594 1595 1596 if (addr->s6_addr8[0] == 0xff) { 1597 scope = addr->s6_addr8[1] & 0x0f; 1598 1599 /* 1600 * due to other scope such as reserved, 1601 * return scope doesn't work. 1602 */ 1603 switch (scope) { 1604 case IPV6_ADDR_SCOPE_NODELOCAL: 1605 return IPV6_ADDR_SCOPE_NODELOCAL; 1606 break; 1607 case IPV6_ADDR_SCOPE_LINKLOCAL: 1608 return IPV6_ADDR_SCOPE_LINKLOCAL; 1609 break; 1610 case IPV6_ADDR_SCOPE_SITELOCAL: 1611 return IPV6_ADDR_SCOPE_SITELOCAL; 1612 break; 1613 default: 1614 return IPV6_ADDR_SCOPE_GLOBAL; 1615 break; 1616 } 1617 } 1618 1619 if (bcmp(&in6addr_loopback, addr, sizeof(addr) - 1) == 0) { 1620 if (addr->s6_addr8[15] == 1) /* loopback */ 1621 return IPV6_ADDR_SCOPE_NODELOCAL; 1622 if (addr->s6_addr8[15] == 0) /* unspecified */ 1623 return IPV6_ADDR_SCOPE_LINKLOCAL; 1624 } 1625 1626 return IPV6_ADDR_SCOPE_GLOBAL; 1627 } 1628 1629 int 1630 in6_addr2scopeid(ifp, addr) 1631 struct ifnet *ifp; /* must not be NULL */ 1632 struct in6_addr *addr; /* must not be NULL */ 1633 { 1634 int scope = in6_addrscope(addr); 1635 1636 switch(scope) { 1637 case IPV6_ADDR_SCOPE_NODELOCAL: 1638 return(-1); /* XXX: is this an appropriate value? */ 1639 1640 case IPV6_ADDR_SCOPE_LINKLOCAL: 1641 /* XXX: we do not distinguish between a link and an I/F. */ 1642 return(ifp->if_index); 1643 1644 case IPV6_ADDR_SCOPE_SITELOCAL: 1645 return(0); /* XXX: invalid. */ 1646 1647 default: 1648 return(0); /* XXX: treat as global. */ 1649 } 1650 } 1651 1652 /* 1653 * return length of part which dst and src are equal 1654 * hard coding... 1655 */ 1656 1657 int 1658 in6_matchlen(src, dst) 1659 struct in6_addr *src, *dst; 1660 { 1661 int match = 0; 1662 u_char *s = (u_char *)src, *d = (u_char *)dst; 1663 u_char *lim = s + 16, r; 1664 1665 while (s < lim) 1666 if ((r = (*d++ ^ *s++)) != 0) { 1667 while (r < 128) { 1668 match++; 1669 r <<= 1; 1670 } 1671 break; 1672 } else 1673 match += 8; 1674 return match; 1675 } 1676 1677 int 1678 in6_are_prefix_equal(p1, p2, len) 1679 struct in6_addr *p1, *p2; 1680 int len; 1681 { 1682 int bytelen, bitlen; 1683 1684 /* sanity check */ 1685 if (0 > len || len > 128) { 1686 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1687 len); 1688 return(0); 1689 } 1690 1691 bytelen = len / 8; 1692 bitlen = len % 8; 1693 1694 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1695 return(0); 1696 if (p1->s6_addr[bytelen] >> (8 - bitlen) != 1697 p2->s6_addr[bytelen] >> (8 - bitlen)) 1698 return(0); 1699 1700 return(1); 1701 } 1702 1703 void 1704 in6_prefixlen2mask(maskp, len) 1705 struct in6_addr *maskp; 1706 int len; 1707 { 1708 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1709 int bytelen, bitlen, i; 1710 1711 /* sanity check */ 1712 if (0 > len || len > 128) { 1713 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1714 len); 1715 return; 1716 } 1717 1718 bzero(maskp, sizeof(*maskp)); 1719 bytelen = len / 8; 1720 bitlen = len % 8; 1721 for (i = 0; i < bytelen; i++) 1722 maskp->s6_addr[i] = 0xff; 1723 if (bitlen) 1724 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1725 } 1726 1727 /* 1728 * return the best address out of the same scope 1729 */ 1730 struct in6_ifaddr * 1731 in6_ifawithscope(oifp, dst) 1732 register struct ifnet *oifp; 1733 register struct in6_addr *dst; 1734 { 1735 int dst_scope = in6_addrscope(dst), src_scope, best_scope; 1736 int blen = -1; 1737 struct ifaddr *ifa; 1738 struct ifnet *ifp; 1739 struct in6_ifaddr *ifa_best = NULL; 1740 1741 if (oifp == NULL) { 1742 printf("in6_ifawithscope: output interface is not specified\n"); 1743 return(NULL); 1744 } 1745 1746 /* 1747 * We search for all addresses on all interfaces from the beginning. 1748 * Comparing an interface with the outgoing interface will be done 1749 * only at the final stage of tiebreaking. 1750 */ 1751 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1752 { 1753 /* 1754 * We can never take an address that breaks the scope zone 1755 * of the destination. 1756 */ 1757 if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst)) 1758 continue; 1759 1760 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1761 ifa = ifa->ifa_list.tqe_next) 1762 { 1763 int tlen = -1, dscopecmp, bscopecmp, matchcmp; 1764 1765 if (ifa->ifa_addr->sa_family != AF_INET6) 1766 continue; 1767 1768 src_scope = in6_addrscope(IFA_IN6(ifa)); 1769 1770 #ifdef ADDRSELECT_DEBUG /* should be removed after stabilization */ 1771 dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope); 1772 printf("in6_ifawithscope: dst=%s bestaddr=%s, " 1773 "newaddr=%s, scope=%x, dcmp=%d, bcmp=%d, " 1774 "matchlen=%d, flgs=%x\n", 1775 ip6_sprintf(dst), 1776 ifa_best ? ip6_sprintf(&ifa_best->ia_addr.sin6_addr) : "none", 1777 ip6_sprintf(IFA_IN6(ifa)), src_scope, 1778 dscopecmp, 1779 ifa_best ? IN6_ARE_SCOPE_CMP(src_scope, best_scope) : -1, 1780 in6_matchlen(IFA_IN6(ifa), dst), 1781 ((struct in6_ifaddr *)ifa)->ia6_flags); 1782 #endif 1783 1784 /* 1785 * Don't use an address before completing DAD 1786 * nor a duplicated address. 1787 */ 1788 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1789 IN6_IFF_NOTREADY) 1790 continue; 1791 1792 /* XXX: is there any case to allow anycasts? */ 1793 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1794 IN6_IFF_ANYCAST) 1795 continue; 1796 1797 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1798 IN6_IFF_DETACHED) 1799 continue; 1800 1801 /* 1802 * If this is the first address we find, 1803 * keep it anyway. 1804 */ 1805 if (ifa_best == NULL) 1806 goto replace; 1807 1808 /* 1809 * ifa_best is never NULL beyond this line except 1810 * within the block labeled "replace". 1811 */ 1812 1813 /* 1814 * If ifa_best has a smaller scope than dst and 1815 * the current address has a larger one than 1816 * (or equal to) dst, always replace ifa_best. 1817 * Also, if the current address has a smaller scope 1818 * than dst, ignore it unless ifa_best also has a 1819 * smaller scope. 1820 */ 1821 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 && 1822 IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0) 1823 goto replace; 1824 if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 && 1825 IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0) 1826 continue; 1827 1828 /* 1829 * A deprecated address SHOULD NOT be used in new 1830 * communications if an alternate (non-deprecated) 1831 * address is available and has sufficient scope. 1832 * RFC 2462, Section 5.5.4. 1833 */ 1834 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1835 IN6_IFF_DEPRECATED) { 1836 /* 1837 * Ignore any deprecated addresses if 1838 * specified by configuration. 1839 */ 1840 if (!ip6_use_deprecated) 1841 continue; 1842 1843 /* 1844 * If we have already found a non-deprecated 1845 * candidate, just ignore deprecated addresses. 1846 */ 1847 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) 1848 == 0) 1849 continue; 1850 } 1851 1852 /* 1853 * A non-deprecated address is always preferred 1854 * to a deprecated one regardless of scopes and 1855 * address matching. 1856 */ 1857 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) && 1858 (((struct in6_ifaddr *)ifa)->ia6_flags & 1859 IN6_IFF_DEPRECATED) == 0) 1860 goto replace; 1861 1862 /* 1863 * At this point, we have two cases: 1864 * 1. we are looking at a non-deprecated address, 1865 * and ifa_best is also non-deprecated. 1866 * 2. we are looking at a deprecated address, 1867 * and ifa_best is also deprecated. 1868 * Also, we do not have to consider a case where 1869 * the scope of if_best is larger(smaller) than dst and 1870 * the scope of the current address is smaller(larger) 1871 * than dst. Such a case has already been covered. 1872 * Tiebreaking is done according to the following 1873 * items: 1874 * - the scope comparison between the address and 1875 * dst (dscopecmp) 1876 * - the scope comparison between the address and 1877 * ifa_best (bscopecmp) 1878 * - if the address match dst longer than ifa_best 1879 * (matchcmp) 1880 * - if the address is on the outgoing I/F (outI/F) 1881 * 1882 * Roughly speaking, the selection policy is 1883 * - the most important item is scope. The same scope 1884 * is best. Then search for a larger scope. 1885 * Smaller scopes are the last resort. 1886 * - A deprecated address is chosen only when we have 1887 * no address that has an enough scope, but is 1888 * prefered to any addresses of smaller scopes. 1889 * - Longest address match against dst is considered 1890 * only for addresses that has the same scope of dst. 1891 * - If there is no other reasons to choose one, 1892 * addresses on the outgoing I/F are preferred. 1893 * 1894 * The precise decision table is as follows: 1895 * dscopecmp bscopecmp matchcmp outI/F | replace? 1896 * !equal equal N/A Yes | Yes (1) 1897 * !equal equal N/A No | No (2) 1898 * larger larger N/A N/A | No (3) 1899 * larger smaller N/A N/A | Yes (4) 1900 * smaller larger N/A N/A | Yes (5) 1901 * smaller smaller N/A N/A | No (6) 1902 * equal smaller N/A N/A | Yes (7) 1903 * equal larger (already done) 1904 * equal equal larger N/A | Yes (8) 1905 * equal equal smaller N/A | No (9) 1906 * equal equal equal Yes | Yes (a) 1907 * eaual eqaul equal No | No (b) 1908 */ 1909 dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope); 1910 bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope); 1911 1912 if (dscopecmp && bscopecmp == 0) { 1913 if (oifp == ifp) /* (1) */ 1914 goto replace; 1915 continue; /* (2) */ 1916 } 1917 if (dscopecmp > 0) { 1918 if (bscopecmp > 0) /* (3) */ 1919 continue; 1920 goto replace; /* (4) */ 1921 } 1922 if (dscopecmp < 0) { 1923 if (bscopecmp > 0) /* (5) */ 1924 goto replace; 1925 continue; /* (6) */ 1926 } 1927 1928 /* now dscopecmp must be 0 */ 1929 if (bscopecmp < 0) 1930 goto replace; /* (7) */ 1931 1932 /* 1933 * At last both dscopecmp and bscopecmp must be 0. 1934 * We need address matching against dst for 1935 * tiebreaking. 1936 */ 1937 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1938 matchcmp = tlen - blen; 1939 if (matchcmp > 0) /* (8) */ 1940 goto replace; 1941 if (matchcmp < 0) /* (9) */ 1942 continue; 1943 if (oifp == ifp) /* (a) */ 1944 goto replace; 1945 continue; /* (b) */ 1946 1947 replace: 1948 ifa_best = (struct in6_ifaddr *)ifa; 1949 blen = tlen >= 0 ? tlen : 1950 in6_matchlen(IFA_IN6(ifa), dst); 1951 best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr); 1952 } 1953 } 1954 1955 /* count statistics for future improvements */ 1956 if (ifa_best == NULL) 1957 ip6stat.ip6s_sources_none++; 1958 else { 1959 if (oifp == ifa_best->ia_ifp) 1960 ip6stat.ip6s_sources_sameif[best_scope]++; 1961 else 1962 ip6stat.ip6s_sources_otherif[best_scope]++; 1963 1964 if (best_scope == dst_scope) 1965 ip6stat.ip6s_sources_samescope[best_scope]++; 1966 else 1967 ip6stat.ip6s_sources_otherscope[best_scope]++; 1968 1969 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) != 0) 1970 ip6stat.ip6s_sources_deprecated[best_scope]++; 1971 } 1972 1973 return(ifa_best); 1974 } 1975 1976 /* 1977 * return the best address out of the same scope. if no address was 1978 * found, return the first valid address from designated IF. 1979 */ 1980 1981 struct in6_ifaddr * 1982 in6_ifawithifp(ifp, dst) 1983 register struct ifnet *ifp; 1984 register struct in6_addr *dst; 1985 { 1986 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1987 struct ifaddr *ifa; 1988 struct in6_ifaddr *besta = 0; 1989 struct in6_ifaddr *dep[2]; /*last-resort: deprecated*/ 1990 1991 dep[0] = dep[1] = NULL; 1992 1993 /* 1994 * We first look for addresses in the same scope. 1995 * If there is one, return it. 1996 * If two or more, return one which matches the dst longest. 1997 * If none, return one of global addresses assigned other ifs. 1998 */ 1999 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) 2000 { 2001 if (ifa->ifa_addr->sa_family != AF_INET6) 2002 continue; 2003 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2004 continue; /* XXX: is there any case to allow anycast? */ 2005 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2006 continue; /* don't use this interface */ 2007 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2008 continue; 2009 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2010 if (ip6_use_deprecated) 2011 dep[0] = (struct in6_ifaddr *)ifa; 2012 continue; 2013 } 2014 2015 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2016 /* 2017 * call in6_matchlen() as few as possible 2018 */ 2019 if (besta) { 2020 if (blen == -1) 2021 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2022 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2023 if (tlen > blen) { 2024 blen = tlen; 2025 besta = (struct in6_ifaddr *)ifa; 2026 } 2027 } else 2028 besta = (struct in6_ifaddr *)ifa; 2029 } 2030 } 2031 if (besta) 2032 return(besta); 2033 2034 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) 2035 { 2036 if (ifa->ifa_addr->sa_family != AF_INET6) 2037 continue; 2038 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2039 continue; /* XXX: is there any case to allow anycast? */ 2040 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2041 continue; /* don't use this interface */ 2042 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2043 continue; 2044 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2045 if (ip6_use_deprecated) 2046 dep[1] = (struct in6_ifaddr *)ifa; 2047 continue; 2048 } 2049 2050 return (struct in6_ifaddr *)ifa; 2051 } 2052 2053 /* use the last-resort values, that are, deprecated addresses */ 2054 if (dep[0]) 2055 return dep[0]; 2056 if (dep[1]) 2057 return dep[1]; 2058 2059 return NULL; 2060 } 2061 2062 /* 2063 * perform DAD when interface becomes IFF_UP. 2064 */ 2065 void 2066 in6_if_up(ifp) 2067 struct ifnet *ifp; 2068 { 2069 struct ifaddr *ifa; 2070 struct in6_ifaddr *ia; 2071 struct sockaddr_dl *sdl; 2072 int type; 2073 struct ether_addr ea; 2074 int off; 2075 int dad_delay; /* delay ticks before DAD output */ 2076 2077 bzero(&ea, sizeof(ea)); 2078 sdl = NULL; 2079 2080 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) 2081 { 2082 if (ifa->ifa_addr->sa_family == AF_INET6 2083 && IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) { 2084 goto dad; 2085 } 2086 if (ifa->ifa_addr->sa_family != AF_LINK) 2087 continue; 2088 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2089 break; 2090 } 2091 2092 switch (ifp->if_type) { 2093 case IFT_LOOP: 2094 in6_ifattach(ifp, IN6_IFT_LOOP, NULL, 1); 2095 break; 2096 case IFT_SLIP: 2097 case IFT_PPP: 2098 case IFT_GIF: 2099 case IFT_FAITH: 2100 type = IN6_IFT_P2P; 2101 in6_ifattach(ifp, type, 0, 1); 2102 break; 2103 case IFT_ETHER: 2104 case IFT_FDDI: 2105 case IFT_ATM: 2106 type = IN6_IFT_802; 2107 if (sdl == NULL) 2108 break; 2109 off = sdl->sdl_nlen; 2110 if (bcmp(&sdl->sdl_data[off], &ea, sizeof(ea)) != 0) 2111 in6_ifattach(ifp, type, LLADDR(sdl), 0); 2112 break; 2113 case IFT_ARCNET: 2114 type = IN6_IFT_ARCNET; 2115 if (sdl == NULL) 2116 break; 2117 off = sdl->sdl_nlen; 2118 if (sdl->sdl_data[off] != 0) /* XXX ?: */ 2119 in6_ifattach(ifp, type, LLADDR(sdl), 0); 2120 break; 2121 default: 2122 break; 2123 } 2124 2125 dad: 2126 dad_delay = 0; 2127 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) 2128 { 2129 if (ifa->ifa_addr->sa_family != AF_INET6) 2130 continue; 2131 ia = (struct in6_ifaddr *)ifa; 2132 if (ia->ia6_flags & IN6_IFF_TENTATIVE) 2133 nd6_dad_start(ifa, &dad_delay); 2134 } 2135 } 2136 2137 /* 2138 * Calculate max IPv6 MTU through all the interfaces and store it 2139 * to in6_maxmtu. 2140 */ 2141 void 2142 in6_setmaxmtu() 2143 { 2144 unsigned long maxmtu = 0; 2145 struct ifnet *ifp; 2146 2147 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 2148 { 2149 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2150 nd_ifinfo[ifp->if_index].linkmtu > maxmtu) 2151 maxmtu = nd_ifinfo[ifp->if_index].linkmtu; 2152 } 2153 if (maxmtu) /* update only when maxmtu is positive */ 2154 in6_maxmtu = maxmtu; 2155 } 2156
Indexes created Fri Sep 26 08:10:20 GMT 2025