Rename functions to avoid conflicts with libc.
[dragonfly.git] / sys / netinet6 / in6_ifattach.c
CommitLineData
984263bc 1/* $FreeBSD: src/sys/netinet6/in6_ifattach.c,v 1.2.2.6 2002/04/28 05:40:26 suz Exp $ */
84204577 2/* $DragonFly: src/sys/netinet6/in6_ifattach.c,v 1.15 2006/09/03 18:29:17 dillon Exp $ */
984263bc
MD
3/* $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ */
4
5/*
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/malloc.h>
37#include <sys/socket.h>
38#include <sys/sockio.h>
39#include <sys/kernel.h>
40#include <sys/syslog.h>
41#include <sys/md5.h>
abf782b3 42#include <sys/thread2.h>
984263bc
MD
43
44#include <net/if.h>
45#include <net/if_dl.h>
46#include <net/if_types.h>
47#include <net/route.h>
48
49#include <netinet/in.h>
50#include <netinet/in_var.h>
51#include <netinet/if_ether.h>
52#include <netinet/in_pcb.h>
53
54#include <netinet/ip6.h>
55#include <netinet6/ip6_var.h>
56#include <netinet6/in6_var.h>
57#include <netinet6/in6_pcb.h>
58#include <netinet6/in6_ifattach.h>
59#include <netinet6/ip6_var.h>
60#include <netinet6/nd6.h>
61#include <netinet6/scope6_var.h>
62
63#include <net/net_osdep.h>
64
984263bc
MD
65unsigned long in6_maxmtu = 0;
66
67#ifdef IP6_AUTO_LINKLOCAL
68int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL;
69#else
70int ip6_auto_linklocal = 1; /* enable by default */
71#endif
72
73struct callout in6_tmpaddrtimer_ch;
74
75extern struct inpcbinfo udbinfo;
76extern struct inpcbinfo ripcbinfo;
77
56d702cc
RG
78static int get_rand_ifid (struct ifnet *, struct in6_addr *);
79static int generate_tmp_ifid (u_int8_t *, const u_int8_t *, u_int8_t *);
80static int get_hw_ifid (struct ifnet *, struct in6_addr *);
81static int get_ifid (struct ifnet *, struct ifnet *, struct in6_addr *);
82static int in6_ifattach_linklocal (struct ifnet *, struct ifnet *);
83static int in6_ifattach_loopback (struct ifnet *);
984263bc
MD
84
85#define EUI64_GBIT 0x01
86#define EUI64_UBIT 0x02
87#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
88#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
89#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
90#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
91#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
92
93#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
94#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
95
96/*
97 * Generate a last-resort interface identifier, when the machine has no
98 * IEEE802/EUI64 address sources.
99 * The goal here is to get an interface identifier that is
100 * (1) random enough and (2) does not change across reboot.
101 * We currently use MD5(hostname) for it.
102 */
103static int
122ebd49
CP
104get_rand_ifid(struct ifnet *ifp,
105 struct in6_addr *in6) /* upper 64bits are preserved */
984263bc
MD
106{
107 MD5_CTX ctxt;
108 u_int8_t digest[16];
109 int hostnamelen = strlen(hostname);
110
111#if 0
112 /* we need at least several letters as seed for ifid */
113 if (hostnamelen < 3)
114 return -1;
115#endif
116
117 /* generate 8 bytes of pseudo-random value. */
118 bzero(&ctxt, sizeof(ctxt));
119 MD5Init(&ctxt);
120 MD5Update(&ctxt, hostname, hostnamelen);
121 MD5Final(digest, &ctxt);
122
123 /* assumes sizeof(digest) > sizeof(ifid) */
124 bcopy(digest, &in6->s6_addr[8], 8);
125
126 /* make sure to set "u" bit to local, and "g" bit to individual. */
127 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
128 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
129
130 /* convert EUI64 into IPv6 interface identifier */
131 EUI64_TO_IFID(in6);
132
133 return 0;
134}
135
136static int
122ebd49 137generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
984263bc
MD
138{
139 MD5_CTX ctxt;
140 u_int8_t seed[16], digest[16], nullbuf[8];
141 u_int32_t val32;
142 struct timeval tv;
143
144 /* If there's no hisotry, start with a random seed. */
145 bzero(nullbuf, sizeof(nullbuf));
146 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
147 int i;
148
149 for (i = 0; i < 2; i++) {
150 microtime(&tv);
151 val32 = random() ^ tv.tv_usec;
152 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
153 }
154 } else {
155 bcopy(seed0, seed, 8);
156 }
157
158 /* copy the right-most 64-bits of the given address */
159 /* XXX assumption on the size of IFID */
160 bcopy(seed1, &seed[8], 8);
161
162 if (0) { /* for debugging purposes only */
163 int i;
164
165 printf("generate_tmp_ifid: new randomized ID from: ");
166 for (i = 0; i < 16; i++)
167 printf("%02x", seed[i]);
168 printf(" ");
169 }
170
171 /* generate 16 bytes of pseudo-random value. */
172 bzero(&ctxt, sizeof(ctxt));
173 MD5Init(&ctxt);
174 MD5Update(&ctxt, seed, sizeof(seed));
175 MD5Final(digest, &ctxt);
176
177 /*
178 * RFC 3041 3.2.1. (3)
179 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
180 * left-most bit is numbered 0) to zero.
181 */
182 bcopy(digest, ret, 8);
183 ret[0] &= ~EUI64_UBIT;
184
185 /*
186 * XXX: we'd like to ensure that the generated value is not zero
187 * for simplicity. If the caclculated digest happens to be zero,
188 * use a random non-zero value as the last resort.
189 */
190 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
191 log(LOG_INFO,
192 "generate_tmp_ifid: computed MD5 value is zero.\n");
193
194 microtime(&tv);
195 val32 = random() ^ tv.tv_usec;
196 val32 = 1 + (val32 % (0xffffffff - 1));
197 }
198
199 /*
200 * RFC 3041 3.2.1. (4)
201 * Take the rightmost 64-bits of the MD5 digest and save them in
202 * stable storage as the history value to be used in the next
203 * iteration of the algorithm.
204 */
205 bcopy(&digest[8], seed0, 8);
206
207 if (0) { /* for debugging purposes only */
208 int i;
209
210 printf("to: ");
211 for (i = 0; i < 16; i++)
212 printf("%02x", digest[i]);
213 printf("\n");
214 }
215
216 return 0;
217}
218
219/*
220 * Get interface identifier for the specified interface.
221 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
222 */
223static int
122ebd49
CP
224get_hw_ifid(struct ifnet *ifp,
225 struct in6_addr *in6) /* upper 64bits are preserved */
984263bc
MD
226{
227 struct ifaddr *ifa;
228 struct sockaddr_dl *sdl;
229 u_int8_t *addr;
230 size_t addrlen;
231 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
232 static u_int8_t allone[8] =
233 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
234
ecd80f47 235 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
984263bc
MD
236 if (ifa->ifa_addr->sa_family != AF_LINK)
237 continue;
238 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
239 if (sdl == NULL)
240 continue;
241 if (sdl->sdl_alen == 0)
242 continue;
243
244 goto found;
245 }
246
247 return -1;
248
249found:
250 addr = LLADDR(sdl);
251 addrlen = sdl->sdl_alen;
252
253 /* get EUI64 */
254 switch (ifp->if_type) {
255 case IFT_ETHER:
256 case IFT_FDDI:
257 case IFT_ATM:
258 case IFT_IEEE1394:
259#ifdef IFT_IEEE80211
260 case IFT_IEEE80211:
261#endif
262 /* IEEE802/EUI64 cases - what others? */
263 /* IEEE1394 uses 16byte length address starting with EUI64 */
264 if (addrlen > 8)
265 addrlen = 8;
266
267 /* look at IEEE802/EUI64 only */
268 if (addrlen != 8 && addrlen != 6)
269 return -1;
270
271 /*
272 * check for invalid MAC address - on bsdi, we see it a lot
273 * since wildboar configures all-zero MAC on pccard before
274 * card insertion.
275 */
276 if (bcmp(addr, allzero, addrlen) == 0)
277 return -1;
278 if (bcmp(addr, allone, addrlen) == 0)
279 return -1;
280
281 /* make EUI64 address */
282 if (addrlen == 8)
283 bcopy(addr, &in6->s6_addr[8], 8);
284 else if (addrlen == 6) {
285 in6->s6_addr[8] = addr[0];
286 in6->s6_addr[9] = addr[1];
287 in6->s6_addr[10] = addr[2];
288 in6->s6_addr[11] = 0xff;
289 in6->s6_addr[12] = 0xfe;
290 in6->s6_addr[13] = addr[3];
291 in6->s6_addr[14] = addr[4];
292 in6->s6_addr[15] = addr[5];
293 }
294 break;
295
296 case IFT_ARCNET:
297 if (addrlen != 1)
298 return -1;
299 if (!addr[0])
300 return -1;
301
302 bzero(&in6->s6_addr[8], 8);
303 in6->s6_addr[15] = addr[0];
304
305 /*
306 * due to insufficient bitwidth, we mark it local.
307 */
308 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
309 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
310 break;
311
312 case IFT_GIF:
313#ifdef IFT_STF
314 case IFT_STF:
315#endif
316 /*
317 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
318 * however, IPv4 address is not very suitable as unique
319 * identifier source (can be renumbered).
320 * we don't do this.
321 */
322 return -1;
323
324 default:
325 return -1;
326 }
327
328 /* sanity check: g bit must not indicate "group" */
329 if (EUI64_GROUP(in6))
330 return -1;
331
332 /* convert EUI64 into IPv6 interface identifier */
333 EUI64_TO_IFID(in6);
334
335 /*
336 * sanity check: ifid must not be all zero, avoid conflict with
337 * subnet router anycast
338 */
339 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
340 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
341 return -1;
342 }
343
344 return 0;
345}
346
347/*
348 * Get interface identifier for the specified interface. If it is not
349 * available on ifp0, borrow interface identifier from other information
350 * sources.
351 */
352static int
122ebd49
CP
353get_ifid(struct ifnet *ifp0,
354 struct ifnet *altifp, /* secondary EUI64 source */
355 struct in6_addr *in6)
984263bc
MD
356{
357 struct ifnet *ifp;
358
359 /* first, try to get it from the interface itself */
360 if (get_hw_ifid(ifp0, in6) == 0) {
361 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
362 if_name(ifp0)));
363 goto success;
364 }
365
366 /* try secondary EUI64 source. this basically is for ATM PVC */
367 if (altifp && get_hw_ifid(altifp, in6) == 0) {
368 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
369 if_name(ifp0), if_name(altifp)));
370 goto success;
371 }
372
373 /* next, try to get it from some other hardware interface */
ecd80f47 374 TAILQ_FOREACH(ifp, &ifnet, if_list) {
984263bc
MD
375 if (ifp == ifp0)
376 continue;
377 if (get_hw_ifid(ifp, in6) != 0)
378 continue;
379
380 /*
381 * to borrow ifid from other interface, ifid needs to be
382 * globally unique
383 */
384 if (IFID_UNIVERSAL(in6)) {
385 nd6log((LOG_DEBUG,
386 "%s: borrow interface identifier from %s\n",
387 if_name(ifp0), if_name(ifp)));
388 goto success;
389 }
390 }
391
392 /* last resort: get from random number source */
393 if (get_rand_ifid(ifp, in6) == 0) {
394 nd6log((LOG_DEBUG,
395 "%s: interface identifier generated by random number\n",
396 if_name(ifp0)));
397 goto success;
398 }
399
400 printf("%s: failed to get interface identifier\n", if_name(ifp0));
401 return -1;
402
403success:
404 nd6log((LOG_INFO, "%s: ifid: "
405 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
406 if_name(ifp0),
407 in6->s6_addr[8], in6->s6_addr[9],
408 in6->s6_addr[10], in6->s6_addr[11],
409 in6->s6_addr[12], in6->s6_addr[13],
410 in6->s6_addr[14], in6->s6_addr[15]));
411 return 0;
412}
413
414static int
122ebd49
CP
415in6_ifattach_linklocal(struct ifnet *ifp,
416 struct ifnet *altifp) /* secondary EUI64 source */
984263bc
MD
417{
418 struct in6_ifaddr *ia;
419 struct in6_aliasreq ifra;
420 struct nd_prefix pr0;
421 int i, error;
422
423 /*
424 * configure link-local address.
425 */
426 bzero(&ifra, sizeof(ifra));
427
428 /*
429 * in6_update_ifa() does not use ifra_name, but we accurately set it
430 * for safety.
431 */
432 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
433
434 ifra.ifra_addr.sin6_family = AF_INET6;
435 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
436 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
984263bc 437 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */
984263bc
MD
438 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
439 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
440 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
441 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
442 } else {
443 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
444 nd6log((LOG_ERR,
445 "%s: no ifid available\n", if_name(ifp)));
446 return -1;
447 }
448 }
984263bc
MD
449
450 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
451 ifra.ifra_prefixmask.sin6_family = AF_INET6;
452 ifra.ifra_prefixmask.sin6_addr = in6mask64;
698ac46c 453
984263bc
MD
454 /* link-local addresses should NEVER expire. */
455 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
456 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
457
458 /*
459 * Do not let in6_update_ifa() do DAD, since we need a random delay
460 * before sending an NS at the first time the interface becomes up.
461 * Instead, in6_if_up() will start DAD with a proper random delay.
462 */
463 ifra.ifra_flags |= IN6_IFF_NODAD;
464
465 /*
466 * Now call in6_update_ifa() to do a bunch of procedures to configure
467 * a link-local address. We can set NULL to the 3rd argument, because
468 * we know there's no other link-local address on the interface
469 * and therefore we are adding one (instead of updating one).
470 */
471 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
472 /*
473 * XXX: When the interface does not support IPv6, this call
474 * would fail in the SIOCSIFADDR ioctl. I believe the
475 * notification is rather confusing in this case, so just
476 * supress it. (jinmei@kame.net 20010130)
477 */
478 if (error != EAFNOSUPPORT)
479 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to "
480 "configure a link-local address on %s "
481 "(errno=%d)\n",
482 if_name(ifp), error);
483 return(-1);
484 }
485
486 /*
487 * Adjust ia6_flags so that in6_if_up will perform DAD.
488 * XXX: Some P2P interfaces seem not to send packets just after
489 * becoming up, so we skip p2p interfaces for safety.
490 */
491 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
492#ifdef DIAGNOSTIC
493 if (!ia) {
494 panic("ia == NULL in in6_ifattach_linklocal");
495 /* NOTREACHED */
496 }
497#endif
498 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) {
499 ia->ia6_flags &= ~IN6_IFF_NODAD;
500 ia->ia6_flags |= IN6_IFF_TENTATIVE;
501 }
502
503 /*
504 * Make the link-local prefix (fe80::/64%link) as on-link.
505 * Since we'd like to manage prefixes separately from addresses,
506 * we make an ND6 prefix structure for the link-local prefix,
507 * and add it to the prefix list as a never-expire prefix.
508 * XXX: this change might affect some existing code base...
509 */
510 bzero(&pr0, sizeof(pr0));
511 pr0.ndpr_ifp = ifp;
512 /* this should be 64 at this moment. */
513 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
514 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr;
515 pr0.ndpr_prefix = ifra.ifra_addr;
516 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
517 for (i = 0; i < 4; i++) {
518 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
519 in6mask64.s6_addr32[i];
520 }
521 /*
522 * Initialize parameters. The link-local prefix must always be
523 * on-link, and its lifetimes never expire.
524 */
525 pr0.ndpr_raf_onlink = 1;
526 pr0.ndpr_raf_auto = 1; /* probably meaningless */
527 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
528 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
529 /*
530 * Since there is no other link-local addresses, nd6_prefix_lookup()
531 * probably returns NULL. However, we cannot always expect the result.
532 * For example, if we first remove the (only) existing link-local
533 * address, and then reconfigure another one, the prefix is still
534 * valid with referring to the old link-local address.
535 */
536 if (nd6_prefix_lookup(&pr0) == NULL) {
537 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
538 return(error);
539 }
540
541 return 0;
542}
543
544static int
122ebd49 545in6_ifattach_loopback(struct ifnet *ifp) /* must be IFT_LOOP */
984263bc
MD
546{
547 struct in6_aliasreq ifra;
548 int error;
549
550 bzero(&ifra, sizeof(ifra));
551
552 /*
553 * in6_update_ifa() does not use ifra_name, but we accurately set it
554 * for safety.
555 */
556 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
557
558 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
559 ifra.ifra_prefixmask.sin6_family = AF_INET6;
560 ifra.ifra_prefixmask.sin6_addr = in6mask128;
561
562 /*
563 * Always initialize ia_dstaddr (= broadcast address) to loopback
564 * address. Follows IPv4 practice - see in_ifinit().
565 */
566 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
567 ifra.ifra_dstaddr.sin6_family = AF_INET6;
84204577 568 ifra.ifra_dstaddr.sin6_addr = kin6addr_loopback;
984263bc
MD
569
570 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
571 ifra.ifra_addr.sin6_family = AF_INET6;
84204577 572 ifra.ifra_addr.sin6_addr = kin6addr_loopback;
984263bc
MD
573
574 /* the loopback address should NEVER expire. */
575 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
576 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
577
578 /* we don't need to perform DAD on loopback interfaces. */
579 ifra.ifra_flags |= IN6_IFF_NODAD;
580
581 /* skip registration to the prefix list. XXX should be temporary. */
582 ifra.ifra_flags |= IN6_IFF_NOPFX;
583
584 /*
585 * We are sure that this is a newly assigned address, so we can set
586 * NULL to the 3rd arg.
587 */
588 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
589 log(LOG_ERR, "in6_ifattach_loopback: failed to configure "
590 "the loopback address on %s (errno=%d)\n",
591 if_name(ifp), error);
592 return(-1);
593 }
594
595 return 0;
596}
597
598/*
599 * compute NI group address, based on the current hostname setting.
600 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
601 *
602 * when ifp == NULL, the caller is responsible for filling scopeid.
603 */
604int
122ebd49
CP
605in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
606 struct in6_addr *in6)
984263bc
MD
607{
608 const char *p;
609 u_char *q;
610 MD5_CTX ctxt;
611 u_int8_t digest[16];
612 char l;
613 char n[64]; /* a single label must not exceed 63 chars */
614
615 if (!namelen || !name)
616 return -1;
617
618 p = name;
619 while (p && *p && *p != '.' && p - name < namelen)
620 p++;
621 if (p - name > sizeof(n) - 1)
622 return -1; /* label too long */
623 l = p - name;
624 strncpy(n, name, l);
625 n[(int)l] = '\0';
626 for (q = n; *q; q++) {
627 if ('A' <= *q && *q <= 'Z')
628 *q = *q - 'A' + 'a';
629 }
630
631 /* generate 8 bytes of pseudo-random value. */
632 bzero(&ctxt, sizeof(ctxt));
633 MD5Init(&ctxt);
634 MD5Update(&ctxt, &l, sizeof(l));
635 MD5Update(&ctxt, n, l);
636 MD5Final(digest, &ctxt);
637
638 bzero(in6, sizeof(*in6));
639 in6->s6_addr16[0] = htons(0xff02);
640 if (ifp)
641 in6->s6_addr16[1] = htons(ifp->if_index);
642 in6->s6_addr8[11] = 2;
643 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
644
645 return 0;
646}
647
648void
122ebd49 649in6_nigroup_attach(const char *name, int namelen)
984263bc
MD
650{
651 struct ifnet *ifp;
652 struct sockaddr_in6 mltaddr;
653 struct in6_multi *in6m;
654 int error;
655
656 bzero(&mltaddr, sizeof(mltaddr));
657 mltaddr.sin6_family = AF_INET6;
658 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
659 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0)
660 return;
661
ecd80f47 662 TAILQ_FOREACH(ifp, &ifnet, if_list) {
984263bc
MD
663 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
664 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
665 if (!in6m) {
666 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) {
667 nd6log((LOG_ERR, "%s: failed to join %s "
668 "(errno=%d)\n", if_name(ifp),
669 ip6_sprintf(&mltaddr.sin6_addr),
670 error));
671 }
672 }
673 }
674}
675
676void
122ebd49 677in6_nigroup_detach(const char *name, int namelen)
984263bc
MD
678{
679 struct ifnet *ifp;
680 struct sockaddr_in6 mltaddr;
681 struct in6_multi *in6m;
682
683 bzero(&mltaddr, sizeof(mltaddr));
684 mltaddr.sin6_family = AF_INET6;
685 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
686 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0)
687 return;
688
ecd80f47 689 TAILQ_FOREACH(ifp, &ifnet, if_list) {
984263bc
MD
690 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
691 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
692 if (in6m)
693 in6_delmulti(in6m);
694 }
695}
696
697/*
698 * XXX multiple loopback interface needs more care. for instance,
699 * nodelocal address needs to be configured onto only one of them.
700 * XXX multiple link-local address case
701 */
702void
122ebd49
CP
703in6_ifattach(struct ifnet *ifp,
704 struct ifnet *altifp) /* secondary EUI64 source */
984263bc 705{
984263bc
MD
706 struct in6_ifaddr *ia;
707 struct in6_addr in6;
708
709 /* some of the interfaces are inherently not IPv6 capable */
710 switch (ifp->if_type) {
711#ifdef IFT_BRIDGE /*OpenBSD 2.8*/
712 case IFT_BRIDGE:
713 return;
714#endif
02742ec6
JS
715 case IFT_PFLOG:
716 case IFT_PFSYNC:
717 return;
984263bc
MD
718 }
719
984263bc
MD
720 /*
721 * quirks based on interface type
722 */
723 switch (ifp->if_type) {
724#ifdef IFT_STF
725 case IFT_STF:
726 /*
727 * 6to4 interface is a very special kind of beast.
728 * no multicast, no linklocal. RFC2529 specifies how to make
729 * linklocals for 6to4 interface, but there's no use and
730 * it is rather harmful to have one.
731 */
732 goto statinit;
733#endif
734 default:
735 break;
736 }
737
738 /*
739 * usually, we require multicast capability to the interface
740 */
741 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
742 log(LOG_INFO, "in6_ifattach: "
743 "%s is not multicast capable, IPv6 not enabled\n",
744 if_name(ifp));
745 return;
746 }
747
748 /*
749 * assign loopback address for loopback interface.
750 * XXX multiple loopback interface case.
751 */
752 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
84204577 753 in6 = kin6addr_loopback;
984263bc
MD
754 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
755 if (in6_ifattach_loopback(ifp) != 0)
756 return;
757 }
758 }
759
760 /*
761 * assign a link-local address, if there's none.
762 */
763 if (ip6_auto_linklocal) {
764 ia = in6ifa_ifpforlinklocal(ifp, 0);
765 if (ia == NULL) {
766 if (in6_ifattach_linklocal(ifp, altifp) == 0) {
767 /* linklocal address assigned */
768 } else {
769 /* failed to assign linklocal address. bark? */
770 }
771 }
772 }
773
774#ifdef IFT_STF /* XXX */
775statinit:
776#endif
777
778 /* update dynamically. */
779 if (in6_maxmtu < ifp->if_mtu)
780 in6_maxmtu = ifp->if_mtu;
984263bc
MD
781}
782
783/*
784 * NOTE: in6_ifdetach() does not support loopback if at this moment.
785 * We don't need this function in bsdi, because interfaces are never removed
786 * from the ifnet list in bsdi.
787 */
788void
122ebd49 789in6_ifdetach(struct ifnet *ifp)
984263bc
MD
790{
791 struct in6_ifaddr *ia, *oia;
792 struct ifaddr *ifa, *next;
793 struct rtentry *rt;
794 short rtflags;
795 struct sockaddr_in6 sin6;
796 struct in6_multi *in6m;
797 struct in6_multi *in6m_next;
798
799 /* nuke prefix list. this may try to remove some of ifaddrs as well */
800 in6_purgeprefix(ifp);
801
802 /* remove neighbor management table */
803 nd6_purge(ifp);
804
805 /* nuke any of IPv6 addresses we have */
ecd80f47 806 TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, next)
984263bc 807 {
984263bc
MD
808 if (ifa->ifa_addr->sa_family != AF_INET6)
809 continue;
810 in6_purgeaddr(ifa);
811 }
812
813 /* undo everything done by in6_ifattach(), just in case */
ecd80f47 814 TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, next) {
984263bc
MD
815 if (ifa->ifa_addr->sa_family != AF_INET6
816 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
817 continue;
818 }
819
820 ia = (struct in6_ifaddr *)ifa;
821
822 /* remove from the routing table */
f23061d4 823 if ((ia->ia_flags & IFA_ROUTE) &&
f3ed2586 824 (rt = rtpurelookup((struct sockaddr *)&ia->ia_addr))) {
984263bc 825 rtflags = rt->rt_flags;
f23061d4 826 --rt->rt_refcnt;
984263bc
MD
827 rtrequest(RTM_DELETE,
828 (struct sockaddr *)&ia->ia_addr,
829 (struct sockaddr *)&ia->ia_addr,
830 (struct sockaddr *)&ia->ia_prefixmask,
831 rtflags, (struct rtentry **)0);
832 }
833
834 /* remove from the linked list */
835 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
836 IFAFREE(&ia->ia_ifa);
837
838 /* also remove from the IPv6 address chain(itojun&jinmei) */
839 oia = ia;
840 if (oia == (ia = in6_ifaddr))
841 in6_ifaddr = ia->ia_next;
842 else {
843 while (ia->ia_next && (ia->ia_next != oia))
844 ia = ia->ia_next;
845 if (ia->ia_next)
846 ia->ia_next = oia->ia_next;
847 else {
848 nd6log((LOG_ERR,
849 "%s: didn't unlink in6ifaddr from "
850 "list\n", if_name(ifp)));
851 }
852 }
853
854 IFAFREE(&oia->ia_ifa);
855 }
856
857 /* leave from all multicast groups joined */
0854930e
MD
858 in6_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp);
859 in6_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp);
984263bc
MD
860 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) {
861 in6m_next = LIST_NEXT(in6m, in6m_entry);
862 if (in6m->in6m_ifp != ifp)
863 continue;
864 in6_delmulti(in6m);
865 in6m = NULL;
866 }
867
868 /*
869 * remove neighbor management table. we call it twice just to make
870 * sure we nuke everything. maybe we need just one call.
871 * XXX: since the first call did not release addresses, some prefixes
872 * might remain. We should call nd6_purge() again to release the
873 * prefixes after removing all addresses above.
874 * (Or can we just delay calling nd6_purge until at this point?)
875 */
876 nd6_purge(ifp);
877
878 /* remove route to link-local allnodes multicast (ff02::1) */
879 bzero(&sin6, sizeof(sin6));
880 sin6.sin6_len = sizeof(struct sockaddr_in6);
881 sin6.sin6_family = AF_INET6;
84204577 882 sin6.sin6_addr = kin6addr_linklocal_allnodes;
984263bc 883 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
f3ed2586 884 rt = rtpurelookup((struct sockaddr *)&sin6);
0c3c561c 885 if (rt != NULL && rt->rt_ifp == ifp) {
f23061d4 886 --rt->rt_refcnt;
984263bc
MD
887 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt),
888 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
984263bc
MD
889 }
890}
891
892void
122ebd49
CP
893in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid,
894 int generate)
984263bc
MD
895{
896 u_int8_t nullbuf[8];
698ac46c 897 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
984263bc
MD
898
899 bzero(nullbuf, sizeof(nullbuf));
900 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
901 /* we've never created a random ID. Create a new one. */
902 generate = 1;
903 }
904
905 if (generate) {
906 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
907
908 /* generate_tmp_ifid will update seedn and buf */
0bdb1448
SW
909 generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
910 ndi->randomid);
984263bc
MD
911 }
912 bcopy(ndi->randomid, retbuf, 8);
913}
914
915void
122ebd49 916in6_tmpaddrtimer(void *ignored_arg)
984263bc 917{
984263bc
MD
918 struct nd_ifinfo *ndi;
919 u_int8_t nullbuf[8];
698ac46c 920 struct ifnet *ifp;
abf782b3
EN
921
922 crit_enter();
984263bc
MD
923
924 callout_reset(&in6_tmpaddrtimer_ch,
925 (ip6_temp_preferred_lifetime - ip6_desync_factor -
926 ip6_temp_regen_advance) * hz,
927 in6_tmpaddrtimer, NULL);
928
929 bzero(nullbuf, sizeof(nullbuf));
698ac46c
HS
930 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
931 ndi = ND_IFINFO(ifp);
984263bc
MD
932 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
933 /*
934 * We've been generating a random ID on this interface.
935 * Create a new one.
936 */
0bdb1448
SW
937 generate_tmp_ifid(ndi->randomseed0,
938 ndi->randomseed1,
939 ndi->randomid);
984263bc
MD
940 }
941 }
942
abf782b3 943 crit_exit();
984263bc 944}