Annotation of src/sys/netinet6/in6_ifattach.c, Revision 1.61
1.61 ! itojun 1: /* $NetBSD: in6_ifattach.c,v 1.60 2004/02/11 20:51:24 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>
1.61 ! itojun 34: __KERNEL_RCSID(0, "$NetBSD: in6_ifattach.c,v 1.60 2004/02/11 20:51:24 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/in6_ifattach.h>
55: #include <netinet6/ip6_var.h>
56: #include <netinet6/nd6.h>
1.55 itojun 57: #include <netinet6/ip6_mroute.h>
1.2 itojun 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
1.54 perry 73: #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (/*CONSTCOND*/ 0)
1.25 itojun 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);
1.50 itojun 106: MD5Update(&ctxt, (u_char *)hostname, hostnamelen);
1.25 itojun 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;
1.50 itojun 133: char *addr;
1.25 itojun 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)));
1.51 itojun 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)
1.49 itojun 394: nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
1.48 itojun 395: "configure a link-local address on %s "
396: "(errno=%d)\n",
1.49 itojun 397: if_name(ifp), error));
1.51 itojun 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)
1.51 itojun 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) {
1.49 itojun 502: nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
1.48 itojun 503: "the loopback address on %s (errno=%d)\n",
1.49 itojun 504: if_name(ifp), error));
1.51 itojun 505: return (-1);
1.48 itojun 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;
1.52 itojun 525: u_int8_t *q;
1.48 itojun 526: MD5_CTX ctxt;
527: u_int8_t digest[16];
1.50 itojun 528: u_int8_t l;
529: u_int8_t 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;
1.50 itojun 540: strncpy((char *)n, name, l);
1.48 itojun 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:
1.59 christos 582: #ifdef IFT_PFLOG
1.58 itojun 583: case IFT_PFLOG:
1.59 christos 584: #endif
585: #ifdef IFT_PFSYNC
1.58 itojun 586: case IFT_PFSYNC:
1.59 christos 587: #endif
1.42 itojun 588: return;
1.38 itojun 589: }
590:
1.46 itojun 591: /*
592: * if link mtu is too small, don't try to configure IPv6.
593: * remember there could be some link-layer that has special
594: * fragmentation logic.
595: */
1.49 itojun 596: if (ifp->if_mtu < IPV6_MMTU) {
597: nd6log((LOG_INFO, "in6_ifattach: "
598: "%s has too small MTU, IPv6 not enabled\n",
599: if_name(ifp)));
1.46 itojun 600: return;
1.49 itojun 601: }
1.46 itojun 602:
1.37 itojun 603: /* create a multicast kludge storage (if we have not had one) */
604: in6_createmkludge(ifp);
1.2 itojun 605:
606: /*
1.25 itojun 607: * quirks based on interface type
1.2 itojun 608: */
1.25 itojun 609: switch (ifp->if_type) {
610: #ifdef IFT_STF
611: case IFT_STF:
612: /*
1.38 itojun 613: * 6to4 interface is a very special kind of beast.
614: * no multicast, no linklocal. RFC2529 specifies how to make
615: * linklocals for 6to4 interface, but there's no use and
616: * it is rather harmful to have one.
1.25 itojun 617: */
1.46 itojun 618: return;
1.25 itojun 619: #endif
620: default:
621: break;
1.7 itojun 622: }
1.2 itojun 623:
624: /*
1.25 itojun 625: * usually, we require multicast capability to the interface
1.2 itojun 626: */
1.25 itojun 627: if ((ifp->if_flags & IFF_MULTICAST) == 0) {
1.49 itojun 628: nd6log((LOG_INFO, "in6_ifattach: "
1.38 itojun 629: "%s is not multicast capable, IPv6 not enabled\n",
1.49 itojun 630: if_name(ifp)));
1.25 itojun 631: return;
632: }
1.15 thorpej 633:
1.2 itojun 634: /*
1.48 itojun 635: * assign loopback address for loopback interface.
636: * XXX multiple loopback interface case.
1.2 itojun 637: */
1.48 itojun 638: if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
639: in6 = in6addr_loopback;
1.25 itojun 640: if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
641: if (in6_ifattach_loopback(ifp) != 0)
642: return;
643: }
644: }
1.2 itojun 645:
646: /*
1.48 itojun 647: * assign a link-local address, if there's none.
1.2 itojun 648: */
1.48 itojun 649: if (ip6_auto_linklocal) {
650: ia = in6ifa_ifpforlinklocal(ifp, 0);
651: if (ia == NULL) {
652: if (in6_ifattach_linklocal(ifp, altifp) == 0) {
653: /* linklocal address assigned */
654: } else {
655: /* failed to assign linklocal address. bark? */
1.25 itojun 656: }
1.2 itojun 657: }
658: }
659: }
660:
1.17 itojun 661: /*
662: * NOTE: in6_ifdetach() does not support loopback if at this moment.
1.41 itojun 663: * We don't need this function in bsdi, because interfaces are never removed
664: * from the ifnet list in bsdi.
1.17 itojun 665: */
1.2 itojun 666: void
667: in6_ifdetach(ifp)
668: struct ifnet *ifp;
669: {
670: struct in6_ifaddr *ia, *oia;
1.30 itojun 671: struct ifaddr *ifa, *next;
1.2 itojun 672: struct rtentry *rt;
673: short rtflags;
1.16 itojun 674: struct sockaddr_in6 sin6;
1.48 itojun 675: struct in6_multi_mship *imm;
1.55 itojun 676:
677: /* remove ip6_mrouter stuff */
678: ip6_mrouter_detach(ifp);
1.18 itojun 679:
680: /* remove neighbor management table */
681: nd6_purge(ifp);
682:
1.30 itojun 683: /* nuke any of IPv6 addresses we have */
684: for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next)
685: {
686: next = ifa->ifa_list.tqe_next;
687: if (ifa->ifa_addr->sa_family != AF_INET6)
688: continue;
1.48 itojun 689: in6_purgeaddr(ifa);
1.30 itojun 690: }
691:
692: /* undo everything done by in6_ifattach(), just in case */
693: for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next)
1.13 itojun 694: {
1.30 itojun 695: next = ifa->ifa_list.tqe_next;
696:
1.2 itojun 697: if (ifa->ifa_addr->sa_family != AF_INET6
698: || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
699: continue;
700: }
701:
702: ia = (struct in6_ifaddr *)ifa;
703:
1.48 itojun 704: /*
705: * leave from multicast groups we have joined for the interface
706: */
707: while ((imm = ia->ia6_memberships.lh_first) != NULL) {
708: LIST_REMOVE(imm, i6mm_chain);
709: in6_leavegroup(imm);
710: }
711:
1.2 itojun 712: /* remove from the routing table */
1.48 itojun 713: if ((ia->ia_flags & IFA_ROUTE) &&
714: (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) {
1.2 itojun 715: rtflags = rt->rt_flags;
716: rtfree(rt);
1.47 itojun 717: rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
718: (struct sockaddr *)&ia->ia_addr,
719: (struct sockaddr *)&ia->ia_prefixmask,
720: rtflags, (struct rtentry **)0);
1.2 itojun 721: }
722:
723: /* remove from the linked list */
724: TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
1.30 itojun 725: IFAFREE(&ia->ia_ifa);
1.2 itojun 726:
727: /* also remove from the IPv6 address chain(itojun&jinmei) */
728: oia = ia;
729: if (oia == (ia = in6_ifaddr))
730: in6_ifaddr = ia->ia_next;
731: else {
732: while (ia->ia_next && (ia->ia_next != oia))
733: ia = ia->ia_next;
734: if (ia->ia_next)
735: ia->ia_next = oia->ia_next;
1.34 itojun 736: else {
1.48 itojun 737: nd6log((LOG_ERR,
1.47 itojun 738: "%s: didn't unlink in6ifaddr from list\n",
739: if_name(ifp)));
1.34 itojun 740: }
1.2 itojun 741: }
742:
1.30 itojun 743: IFAFREE(&oia->ia_ifa);
1.16 itojun 744: }
745:
1.17 itojun 746: /* cleanup multicast address kludge table, if there is any */
747: in6_purgemkludge(ifp);
1.30 itojun 748:
1.41 itojun 749: /*
750: * remove neighbor management table. we call it twice just to make
751: * sure we nuke everything. maybe we need just one call.
752: * XXX: since the first call did not release addresses, some prefixes
753: * might remain. We should call nd6_purge() again to release the
754: * prefixes after removing all addresses above.
755: * (Or can we just delay calling nd6_purge until at this point?)
756: */
1.30 itojun 757: nd6_purge(ifp);
1.18 itojun 758:
1.16 itojun 759: /* remove route to link-local allnodes multicast (ff02::1) */
760: bzero(&sin6, sizeof(sin6));
761: sin6.sin6_len = sizeof(struct sockaddr_in6);
762: sin6.sin6_family = AF_INET6;
763: sin6.sin6_addr = in6addr_linklocal_allnodes;
764: sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
1.33 itojun 765: rt = rtalloc1((struct sockaddr *)&sin6, 0);
766: if (rt && rt->rt_ifp == ifp) {
1.16 itojun 767: rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt),
1.48 itojun 768: rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
1.16 itojun 769: rtfree(rt);
1.2 itojun 770: }
771: }
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