Annotation of src/sys/netinet6/in6_ifattach.c, Revision 1.48
1.48 ! itojun 1: /* $NetBSD: in6_ifattach.c,v 1.47 2002/06/07 04:30:40 itojun Exp $ */
1.37 itojun 2: /* $KAME: in6_ifattach.c,v 1.124 2001/07/18 08:32:51 jinmei Exp $ */
1.3 thorpej 3:
1.2 itojun 4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
1.24 itojun 7: *
1.2 itojun 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.
1.24 itojun 19: *
1.2 itojun 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: */
1.39 lukem 32:
33: #include <sys/cdefs.h>
1.48 ! itojun 34: __KERNEL_RCSID(0, "$NetBSD: in6_ifattach.c,v 1.47 2002/06/07 04:30:40 itojun Exp $");
1.2 itojun 35:
36: #include <sys/param.h>
37: #include <sys/systm.h>
38: #include <sys/malloc.h>
39: #include <sys/socket.h>
40: #include <sys/sockio.h>
1.13 itojun 41: #include <sys/kernel.h>
1.34 itojun 42: #include <sys/syslog.h>
1.13 itojun 43: #include <sys/md5.h>
1.2 itojun 44:
45: #include <net/if.h>
46: #include <net/if_dl.h>
47: #include <net/if_types.h>
48: #include <net/route.h>
49:
50: #include <netinet/in.h>
51: #include <netinet/in_var.h>
52:
1.19 itojun 53: #include <netinet/ip6.h>
1.2 itojun 54: #include <netinet6/ip6_var.h>
55: #include <netinet6/in6_ifattach.h>
56: #include <netinet6/ip6_var.h>
57: #include <netinet6/nd6.h>
58:
1.13 itojun 59: #include <net/net_osdep.h>
60:
1.2 itojun 61: unsigned long in6_maxmtu = 0;
62:
1.48 ! itojun 63: int ip6_auto_linklocal = 1; /* enable by default */
! 64:
1.25 itojun 65: static int get_rand_ifid __P((struct ifnet *, struct in6_addr *));
66: static int get_hw_ifid __P((struct ifnet *, struct in6_addr *));
67: static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *));
68: static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *));
69: static int in6_ifattach_loopback __P((struct ifnet *));
70:
71: #define EUI64_GBIT 0x01
72: #define EUI64_UBIT 0x02
73: #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
74: #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
75: #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
76: #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
77: #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
78:
79: #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
80: #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
81:
82: /*
83: * Generate a last-resort interface identifier, when the machine has no
84: * IEEE802/EUI64 address sources.
85: * The goal here is to get an interface identifier that is
86: * (1) random enough and (2) does not change across reboot.
87: * We currently use MD5(hostname) for it.
88: */
89: static int
90: get_rand_ifid(ifp, in6)
91: struct ifnet *ifp;
1.40 itojun 92: struct in6_addr *in6; /* upper 64bits are preserved */
1.25 itojun 93: {
94: MD5_CTX ctxt;
95: u_int8_t digest[16];
96:
97: #if 0
98: /* we need at least several letters as seed for ifid */
99: if (hostnamelen < 3)
100: return -1;
101: #endif
102:
103: /* generate 8 bytes of pseudo-random value. */
104: bzero(&ctxt, sizeof(ctxt));
105: MD5Init(&ctxt);
106: MD5Update(&ctxt, hostname, hostnamelen);
107: MD5Final(digest, &ctxt);
108:
109: /* assumes sizeof(digest) > sizeof(ifid) */
110: bcopy(digest, &in6->s6_addr[8], 8);
1.2 itojun 111:
1.25 itojun 112: /* make sure to set "u" bit to local, and "g" bit to individual. */
113: in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
114: in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
115:
116: /* convert EUI64 into IPv6 interface identifier */
117: EUI64_TO_IFID(in6);
118:
119: return 0;
120: }
1.2 itojun 121:
1.25 itojun 122: /*
123: * Get interface identifier for the specified interface.
124: * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
125: */
1.7 itojun 126: static int
1.25 itojun 127: get_hw_ifid(ifp, in6)
128: struct ifnet *ifp;
1.40 itojun 129: struct in6_addr *in6; /* upper 64bits are preserved */
1.2 itojun 130: {
1.25 itojun 131: struct ifaddr *ifa;
132: struct sockaddr_dl *sdl;
133: u_int8_t *addr;
134: size_t addrlen;
135: static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
136: static u_int8_t allone[8] =
137: { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
138:
139: for (ifa = ifp->if_addrlist.tqh_first;
140: ifa;
141: ifa = ifa->ifa_list.tqe_next)
142: {
143: if (ifa->ifa_addr->sa_family != AF_LINK)
144: continue;
145: sdl = (struct sockaddr_dl *)ifa->ifa_addr;
146: if (sdl == NULL)
147: continue;
148: if (sdl->sdl_alen == 0)
149: continue;
150:
151: goto found;
152: }
153:
154: return -1;
155:
156: found:
157: addr = LLADDR(sdl);
158: addrlen = sdl->sdl_alen;
159:
1.48 ! itojun 160: switch (ifp->if_type) {
! 161: case IFT_IEEE1394:
! 162: case IFT_IEEE80211:
! 163: /* IEEE1394 uses 16byte length address starting with EUI64 */
! 164: if (addrlen > 8)
! 165: addrlen = 8;
! 166: break;
! 167: default:
! 168: break;
! 169: }
! 170:
1.25 itojun 171: /* get EUI64 */
172: switch (ifp->if_type) {
1.48 ! itojun 173: /* IEEE802/EUI64 cases - what others? */
1.25 itojun 174: case IFT_ETHER:
175: case IFT_FDDI:
176: case IFT_ATM:
1.32 onoe 177: case IFT_IEEE1394:
1.48 ! itojun 178: case IFT_IEEE80211:
1.25 itojun 179: /* look at IEEE802/EUI64 only */
180: if (addrlen != 8 && addrlen != 6)
181: return -1;
1.13 itojun 182:
1.25 itojun 183: /*
184: * check for invalid MAC address - on bsdi, we see it a lot
185: * since wildboar configures all-zero MAC on pccard before
186: * card insertion.
187: */
188: if (bcmp(addr, allzero, addrlen) == 0)
189: return -1;
190: if (bcmp(addr, allone, addrlen) == 0)
191: return -1;
192:
193: /* make EUI64 address */
194: if (addrlen == 8)
195: bcopy(addr, &in6->s6_addr[8], 8);
196: else if (addrlen == 6) {
197: in6->s6_addr[8] = addr[0];
198: in6->s6_addr[9] = addr[1];
199: in6->s6_addr[10] = addr[2];
200: in6->s6_addr[11] = 0xff;
1.26 itojun 201: in6->s6_addr[12] = 0xfe;
1.25 itojun 202: in6->s6_addr[13] = addr[3];
203: in6->s6_addr[14] = addr[4];
204: in6->s6_addr[15] = addr[5];
205: }
1.7 itojun 206: break;
1.25 itojun 207:
208: case IFT_ARCNET:
209: if (addrlen != 1)
210: return -1;
211: if (!addr[0])
212: return -1;
213:
214: bzero(&in6->s6_addr[8], 8);
215: in6->s6_addr[15] = addr[0];
216:
1.27 itojun 217: /*
218: * due to insufficient bitwidth, we mark it local.
219: */
1.25 itojun 220: in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
221: in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
1.7 itojun 222: break;
1.25 itojun 223:
224: case IFT_GIF:
225: #ifdef IFT_STF
226: case IFT_STF:
227: #endif
228: /*
1.34 itojun 229: * RFC2893 says: "SHOULD use IPv4 address as ifid source".
1.27 itojun 230: * however, IPv4 address is not very suitable as unique
231: * identifier source (can be renumbered).
232: * we don't do this.
1.25 itojun 233: */
234: return -1;
235:
1.7 itojun 236: default:
1.25 itojun 237: return -1;
238: }
239:
240: /* sanity check: g bit must not indicate "group" */
241: if (EUI64_GROUP(in6))
242: return -1;
243:
244: /* convert EUI64 into IPv6 interface identifier */
245: EUI64_TO_IFID(in6);
246:
247: /*
248: * sanity check: ifid must not be all zero, avoid conflict with
249: * subnet router anycast
250: */
251: if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
252: bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
253: return -1;
1.7 itojun 254: }
255:
256: return 0;
1.2 itojun 257: }
258:
259: /*
1.25 itojun 260: * Get interface identifier for the specified interface. If it is not
261: * available on ifp0, borrow interface identifier from other information
262: * sources.
1.13 itojun 263: */
264: static int
1.25 itojun 265: get_ifid(ifp0, altifp, in6)
266: struct ifnet *ifp0;
267: struct ifnet *altifp; /*secondary EUI64 source*/
268: struct in6_addr *in6;
1.13 itojun 269: {
1.25 itojun 270: struct ifnet *ifp;
271:
272: /* first, try to get it from the interface itself */
273: if (get_hw_ifid(ifp0, in6) == 0) {
1.34 itojun 274: nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
275: if_name(ifp0)));
1.25 itojun 276: goto success;
277: }
278:
279: /* try secondary EUI64 source. this basically is for ATM PVC */
280: if (altifp && get_hw_ifid(altifp, in6) == 0) {
1.34 itojun 281: nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
282: if_name(ifp0), if_name(altifp)));
1.25 itojun 283: goto success;
284: }
285:
286: /* next, try to get it from some other hardware interface */
287: for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
288: {
289: if (ifp == ifp0)
290: continue;
291: if (get_hw_ifid(ifp, in6) != 0)
292: continue;
1.27 itojun 293:
1.25 itojun 294: /*
295: * to borrow ifid from other interface, ifid needs to be
296: * globally unique
297: */
298: if (IFID_UNIVERSAL(in6)) {
1.34 itojun 299: nd6log((LOG_DEBUG,
300: "%s: borrow interface identifier from %s\n",
301: if_name(ifp0), if_name(ifp)));
1.25 itojun 302: goto success;
303: }
304: }
1.13 itojun 305:
1.25 itojun 306: /* last resort: get from random number source */
307: if (get_rand_ifid(ifp, in6) == 0) {
1.34 itojun 308: nd6log((LOG_DEBUG,
309: "%s: interface identifier generated by random number\n",
310: if_name(ifp0)));
1.25 itojun 311: goto success;
312: }
1.13 itojun 313:
1.31 itojun 314: printf("%s: failed to get interface identifier\n", if_name(ifp0));
1.25 itojun 315: return -1;
1.13 itojun 316:
1.25 itojun 317: success:
1.47 itojun 318: nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
319: if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
320: in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
321: in6->s6_addr[14], in6->s6_addr[15]));
1.13 itojun 322: return 0;
323: }
324:
1.25 itojun 325: static int
1.48 ! itojun 326: in6_ifattach_linklocal(ifp, altifp)
1.25 itojun 327: struct ifnet *ifp;
1.48 ! itojun 328: struct ifnet *altifp; /*secondary EUI64 source*/
! 329: {
1.25 itojun 330: struct in6_ifaddr *ia;
1.48 ! itojun 331: struct in6_aliasreq ifra;
! 332: struct nd_prefix pr0;
! 333: int i, error;
1.25 itojun 334:
335: /*
1.48 ! itojun 336: * configure link-local address.
1.25 itojun 337: */
1.48 ! itojun 338: bzero(&ifra, sizeof(ifra));
1.2 itojun 339:
1.25 itojun 340: /*
1.48 ! itojun 341: * in6_update_ifa() does not use ifra_name, but we accurately set it
! 342: * for safety.
1.25 itojun 343: */
1.48 ! itojun 344: strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1.2 itojun 345:
1.48 ! itojun 346: ifra.ifra_addr.sin6_family = AF_INET6;
! 347: ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
! 348: ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
! 349: ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
! 350: ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
! 351: if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
! 352: ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
! 353: ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
! 354: } else {
! 355: if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
! 356: nd6log((LOG_ERR,
! 357: "%s: no ifid available\n", if_name(ifp)));
! 358: return(-1);
1.25 itojun 359: }
360: }
361:
1.48 ! itojun 362: ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
! 363: ifra.ifra_prefixmask.sin6_family = AF_INET6;
! 364: ifra.ifra_prefixmask.sin6_addr = in6mask64;
! 365: #ifdef SCOPEDROUTING
! 366: /* take into account the sin6_scope_id field for routing */
! 367: ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff;
1.25 itojun 368: #endif
1.48 ! itojun 369: /* link-local addresses should NEVER expire. */
! 370: ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
! 371: ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
1.25 itojun 372:
1.48 ! itojun 373: /*
! 374: * Do not let in6_update_ifa() do DAD, since we need a random delay
! 375: * before sending an NS at the first time the interface becomes up.
! 376: * Instead, in6_if_up() will start DAD with a proper random delay.
! 377: */
! 378: ifra.ifra_flags |= IN6_IFF_NODAD;
1.25 itojun 379:
1.48 ! itojun 380: /*
! 381: * Now call in6_update_ifa() to do a bunch of procedures to configure
! 382: * a link-local address. We can set NULL to the 3rd argument, because
! 383: * we know there's no other link-local address on the interface
! 384: * and therefore we are adding one (instead of updating one).
! 385: */
! 386: if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
1.25 itojun 387: /*
1.48 ! itojun 388: * XXX: When the interface does not support IPv6, this call
! 389: * would fail in the SIOCSIFADDR ioctl. I believe the
! 390: * notification is rather confusing in this case, so just
! 391: * suppress it. (jinmei@kame.net 20010130)
1.25 itojun 392: */
1.48 ! itojun 393: if (error != EAFNOSUPPORT)
! 394: log(LOG_NOTICE, "in6_ifattach_linklocal: failed to "
! 395: "configure a link-local address on %s "
! 396: "(errno=%d)\n",
! 397: if_name(ifp), error);
! 398: return(-1);
1.25 itojun 399: }
400:
401: /*
1.48 ! itojun 402: * Adjust ia6_flags so that in6_if_up will perform DAD.
! 403: * XXX: Some P2P interfaces seem not to send packets just after
! 404: * becoming up, so we skip p2p interfaces for safety.
1.25 itojun 405: */
1.48 ! itojun 406: ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
! 407: #ifdef DIAGNOSTIC
! 408: if (!ia) {
! 409: panic("ia == NULL in in6_ifattach_linklocal");
! 410: /* NOTREACHED */
! 411: }
! 412: #endif
! 413: if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) {
! 414: ia->ia6_flags &= ~IN6_IFF_NODAD;
! 415: ia->ia6_flags |= IN6_IFF_TENTATIVE;
1.25 itojun 416: }
417:
1.48 ! itojun 418: /*
! 419: * Make the link-local prefix (fe80::/64%link) as on-link.
! 420: * Since we'd like to manage prefixes separately from addresses,
! 421: * we make an ND6 prefix structure for the link-local prefix,
! 422: * and add it to the prefix list as a never-expire prefix.
! 423: * XXX: this change might affect some existing code base...
! 424: */
! 425: bzero(&pr0, sizeof(pr0));
! 426: pr0.ndpr_ifp = ifp;
! 427: /* this should be 64 at this moment. */
! 428: pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
! 429: pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr;
! 430: pr0.ndpr_prefix = ifra.ifra_addr;
! 431: /* apply the mask for safety. (nd6_prelist_add will apply it again) */
! 432: for (i = 0; i < 4; i++) {
! 433: pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
! 434: in6mask64.s6_addr32[i];
! 435: }
! 436: /*
! 437: * Initialize parameters. The link-local prefix must always be
! 438: * on-link, and its lifetimes never expire.
! 439: */
! 440: pr0.ndpr_raf_onlink = 1;
! 441: pr0.ndpr_raf_auto = 1; /* probably meaningless */
! 442: pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
! 443: pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
! 444: /*
! 445: * Since there is no other link-local addresses, nd6_prefix_lookup()
! 446: * probably returns NULL. However, we cannot always expect the result.
! 447: * For example, if we first remove the (only) existing link-local
! 448: * address, and then reconfigure another one, the prefix is still
! 449: * valid with referring to the old link-local address.
! 450: */
! 451: if (nd6_prefix_lookup(&pr0) == NULL) {
! 452: if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
! 453: return(error);
1.25 itojun 454: }
455:
456: return 0;
457: }
458:
459: static int
460: in6_ifattach_loopback(ifp)
461: struct ifnet *ifp; /* must be IFT_LOOP */
462: {
1.48 ! itojun 463: struct in6_aliasreq ifra;
! 464: int error;
! 465:
! 466: bzero(&ifra, sizeof(ifra));
1.25 itojun 467:
468: /*
1.48 ! itojun 469: * in6_update_ifa() does not use ifra_name, but we accurately set it
! 470: * for safety.
1.25 itojun 471: */
1.48 ! itojun 472: strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
! 473:
! 474: ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
! 475: ifra.ifra_prefixmask.sin6_family = AF_INET6;
! 476: ifra.ifra_prefixmask.sin6_addr = in6mask128;
1.25 itojun 477:
478: /*
479: * Always initialize ia_dstaddr (= broadcast address) to loopback
1.48 ! itojun 480: * address. Follows IPv4 practice - see in_ifinit().
! 481: */
! 482: ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
! 483: ifra.ifra_dstaddr.sin6_family = AF_INET6;
! 484: ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
! 485:
! 486: ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
! 487: ifra.ifra_addr.sin6_family = AF_INET6;
! 488: ifra.ifra_addr.sin6_addr = in6addr_loopback;
! 489:
! 490: /* the loopback address should NEVER expire. */
! 491: ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
! 492: ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
! 493:
! 494: /* we don't need to perform DAD on loopback interfaces. */
! 495: ifra.ifra_flags |= IN6_IFF_NODAD;
! 496:
! 497: /*
! 498: * We are sure that this is a newly assigned address, so we can set
! 499: * NULL to the 3rd arg.
! 500: */
! 501: if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
! 502: log(LOG_ERR, "in6_ifattach_loopback: failed to configure "
! 503: "the loopback address on %s (errno=%d)\n",
! 504: if_name(ifp), error);
! 505: return(-1);
! 506: }
1.25 itojun 507:
1.48 ! itojun 508: return 0;
! 509: }
! 510:
! 511: /*
! 512: * compute NI group address, based on the current hostname setting.
! 513: * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
! 514: *
! 515: * when ifp == NULL, the caller is responsible for filling scopeid.
! 516: */
! 517: int
! 518: in6_nigroup(ifp, name, namelen, sa6)
! 519: struct ifnet *ifp;
! 520: const char *name;
! 521: int namelen;
! 522: struct sockaddr_in6 *sa6;
! 523: {
! 524: const char *p;
! 525: u_char *q;
! 526: MD5_CTX ctxt;
! 527: u_int8_t digest[16];
! 528: char l;
! 529: char n[64]; /* a single label must not exceed 63 chars */
1.25 itojun 530:
1.48 ! itojun 531: if (!namelen || !name)
1.25 itojun 532: return -1;
1.48 ! itojun 533:
! 534: p = name;
! 535: while (p && *p && *p != '.' && p - name < namelen)
! 536: p++;
! 537: if (p - name > sizeof(n) - 1)
! 538: return -1; /* label too long */
! 539: l = p - name;
! 540: strncpy(n, name, l);
! 541: n[(int)l] = '\0';
! 542: for (q = n; *q; q++) {
! 543: if ('A' <= *q && *q <= 'Z')
! 544: *q = *q - 'A' + 'a';
1.2 itojun 545: }
1.25 itojun 546:
1.48 ! itojun 547: /* generate 8 bytes of pseudo-random value. */
! 548: bzero(&ctxt, sizeof(ctxt));
! 549: MD5Init(&ctxt);
! 550: MD5Update(&ctxt, &l, sizeof(l));
! 551: MD5Update(&ctxt, n, l);
! 552: MD5Final(digest, &ctxt);
! 553:
! 554: bzero(sa6, sizeof(*sa6));
! 555: sa6->sin6_family = AF_INET6;
! 556: sa6->sin6_len = sizeof(*sa6);
! 557: sa6->sin6_addr.s6_addr16[0] = htons(0xff02);
! 558: sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
! 559: sa6->sin6_addr.s6_addr8[11] = 2;
! 560: bcopy(digest, &sa6->sin6_addr.s6_addr32[3],
! 561: sizeof(sa6->sin6_addr.s6_addr32[3]));
! 562:
1.25 itojun 563: return 0;
1.2 itojun 564: }
565:
1.17 itojun 566: /*
567: * XXX multiple loopback interface needs more care. for instance,
568: * nodelocal address needs to be configured onto only one of them.
1.25 itojun 569: * XXX multiple link-local address case
1.17 itojun 570: */
1.2 itojun 571: void
1.25 itojun 572: in6_ifattach(ifp, altifp)
1.2 itojun 573: struct ifnet *ifp;
1.25 itojun 574: struct ifnet *altifp; /* secondary EUI64 source */
1.2 itojun 575: {
1.25 itojun 576: struct in6_ifaddr *ia;
577: struct in6_addr in6;
1.13 itojun 578:
1.38 itojun 579: /* some of the interfaces are inherently not IPv6 capable */
580: switch (ifp->if_type) {
1.42 itojun 581: case IFT_BRIDGE:
582: return;
1.38 itojun 583: }
584:
1.46 itojun 585: /*
586: * if link mtu is too small, don't try to configure IPv6.
587: * remember there could be some link-layer that has special
588: * fragmentation logic.
589: */
590: if (ifp->if_mtu < IPV6_MMTU)
591: return;
592:
1.37 itojun 593: /* create a multicast kludge storage (if we have not had one) */
594: in6_createmkludge(ifp);
1.2 itojun 595:
596: /*
1.25 itojun 597: * quirks based on interface type
1.2 itojun 598: */
1.25 itojun 599: switch (ifp->if_type) {
600: #ifdef IFT_STF
601: case IFT_STF:
602: /*
1.38 itojun 603: * 6to4 interface is a very special kind of beast.
604: * no multicast, no linklocal. RFC2529 specifies how to make
605: * linklocals for 6to4 interface, but there's no use and
606: * it is rather harmful to have one.
1.25 itojun 607: */
1.46 itojun 608: return;
1.25 itojun 609: #endif
610: default:
611: break;
1.7 itojun 612: }
1.2 itojun 613:
614: /*
1.25 itojun 615: * usually, we require multicast capability to the interface
1.2 itojun 616: */
1.25 itojun 617: if ((ifp->if_flags & IFF_MULTICAST) == 0) {
1.38 itojun 618: log(LOG_INFO, "in6_ifattach: "
619: "%s is not multicast capable, IPv6 not enabled\n",
1.25 itojun 620: if_name(ifp));
621: return;
622: }
1.15 thorpej 623:
1.2 itojun 624: /*
1.48 ! itojun 625: * assign loopback address for loopback interface.
! 626: * XXX multiple loopback interface case.
1.2 itojun 627: */
1.48 ! itojun 628: if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
! 629: in6 = in6addr_loopback;
1.25 itojun 630: if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
631: if (in6_ifattach_loopback(ifp) != 0)
632: return;
633: }
634: }
1.2 itojun 635:
636: /*
1.48 ! itojun 637: * assign a link-local address, if there's none.
1.2 itojun 638: */
1.48 ! itojun 639: if (ip6_auto_linklocal) {
! 640: ia = in6ifa_ifpforlinklocal(ifp, 0);
! 641: if (ia == NULL) {
! 642: if (in6_ifattach_linklocal(ifp, altifp) == 0) {
! 643: /* linklocal address assigned */
! 644: } else {
! 645: /* failed to assign linklocal address. bark? */
1.25 itojun 646: }
1.2 itojun 647: }
648: }
649: }
650:
1.17 itojun 651: /*
652: * NOTE: in6_ifdetach() does not support loopback if at this moment.
1.41 itojun 653: * We don't need this function in bsdi, because interfaces are never removed
654: * from the ifnet list in bsdi.
1.17 itojun 655: */
1.2 itojun 656: void
657: in6_ifdetach(ifp)
658: struct ifnet *ifp;
659: {
660: struct in6_ifaddr *ia, *oia;
1.30 itojun 661: struct ifaddr *ifa, *next;
1.2 itojun 662: struct rtentry *rt;
663: short rtflags;
1.16 itojun 664: struct sockaddr_in6 sin6;
1.48 ! itojun 665: struct in6_multi_mship *imm;
1.18 itojun 666:
667: /* remove neighbor management table */
668: nd6_purge(ifp);
669:
1.30 itojun 670: /* nuke any of IPv6 addresses we have */
671: for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next)
672: {
673: next = ifa->ifa_list.tqe_next;
674: if (ifa->ifa_addr->sa_family != AF_INET6)
675: continue;
1.48 ! itojun 676: in6_purgeaddr(ifa);
1.30 itojun 677: }
678:
679: /* undo everything done by in6_ifattach(), just in case */
680: for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next)
1.13 itojun 681: {
1.30 itojun 682: next = ifa->ifa_list.tqe_next;
683:
684:
1.2 itojun 685: if (ifa->ifa_addr->sa_family != AF_INET6
686: || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
687: continue;
688: }
689:
690: ia = (struct in6_ifaddr *)ifa;
691:
1.48 ! itojun 692: /*
! 693: * leave from multicast groups we have joined for the interface
! 694: */
! 695: while ((imm = ia->ia6_memberships.lh_first) != NULL) {
! 696: LIST_REMOVE(imm, i6mm_chain);
! 697: in6_leavegroup(imm);
! 698: }
! 699:
1.2 itojun 700: /* remove from the routing table */
1.48 ! itojun 701: if ((ia->ia_flags & IFA_ROUTE) &&
! 702: (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) {
1.2 itojun 703: rtflags = rt->rt_flags;
704: rtfree(rt);
1.47 itojun 705: rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
706: (struct sockaddr *)&ia->ia_addr,
707: (struct sockaddr *)&ia->ia_prefixmask,
708: rtflags, (struct rtentry **)0);
1.2 itojun 709: }
710:
711: /* remove from the linked list */
712: TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
1.30 itojun 713: IFAFREE(&ia->ia_ifa);
1.2 itojun 714:
715: /* also remove from the IPv6 address chain(itojun&jinmei) */
716: oia = ia;
717: if (oia == (ia = in6_ifaddr))
718: in6_ifaddr = ia->ia_next;
719: else {
720: while (ia->ia_next && (ia->ia_next != oia))
721: ia = ia->ia_next;
722: if (ia->ia_next)
723: ia->ia_next = oia->ia_next;
1.34 itojun 724: else {
1.48 ! itojun 725: nd6log((LOG_ERR,
1.47 itojun 726: "%s: didn't unlink in6ifaddr from list\n",
727: if_name(ifp)));
1.34 itojun 728: }
1.2 itojun 729: }
730:
1.30 itojun 731: IFAFREE(&oia->ia_ifa);
1.16 itojun 732: }
733:
1.17 itojun 734: /* cleanup multicast address kludge table, if there is any */
735: in6_purgemkludge(ifp);
1.30 itojun 736:
1.41 itojun 737: /*
738: * remove neighbor management table. we call it twice just to make
739: * sure we nuke everything. maybe we need just one call.
740: * XXX: since the first call did not release addresses, some prefixes
741: * might remain. We should call nd6_purge() again to release the
742: * prefixes after removing all addresses above.
743: * (Or can we just delay calling nd6_purge until at this point?)
744: */
1.30 itojun 745: nd6_purge(ifp);
1.18 itojun 746:
1.16 itojun 747: /* remove route to link-local allnodes multicast (ff02::1) */
748: bzero(&sin6, sizeof(sin6));
749: sin6.sin6_len = sizeof(struct sockaddr_in6);
750: sin6.sin6_family = AF_INET6;
751: sin6.sin6_addr = in6addr_linklocal_allnodes;
752: sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
1.33 itojun 753: rt = rtalloc1((struct sockaddr *)&sin6, 0);
754: if (rt && rt->rt_ifp == ifp) {
1.16 itojun 755: rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt),
1.48 ! itojun 756: rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
1.16 itojun 757: rtfree(rt);
1.2 itojun 758: }
759: }
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