1 | /* $NetBSD: in6_ifattach.c,v 1.106 2016/10/18 02:45:41 ozaki-r Exp $ */ |
2 | /* $KAME: in6_ifattach.c,v 1.124 2001/07/18 08:32:51 jinmei 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 | #include <sys/cdefs.h> |
34 | __KERNEL_RCSID(0, "$NetBSD: in6_ifattach.c,v 1.106 2016/10/18 02:45:41 ozaki-r Exp $" ); |
35 | |
36 | #include <sys/param.h> |
37 | #include <sys/systm.h> |
38 | #include <sys/kmem.h> |
39 | #include <sys/socket.h> |
40 | #include <sys/sockio.h> |
41 | #include <sys/kernel.h> |
42 | #include <sys/syslog.h> |
43 | #include <sys/md5.h> |
44 | #include <sys/socketvar.h> |
45 | #include <sys/cprng.h> |
46 | |
47 | #include <net/if.h> |
48 | #include <net/if_dl.h> |
49 | #include <net/if_types.h> |
50 | #include <net/route.h> |
51 | |
52 | #include <netinet/in.h> |
53 | #include <netinet/in_var.h> |
54 | |
55 | #include <netinet/ip6.h> |
56 | #include <netinet6/in6_ifattach.h> |
57 | #include <netinet6/ip6_var.h> |
58 | #include <netinet6/nd6.h> |
59 | #include <netinet6/ip6_mroute.h> |
60 | #include <netinet6/scope6_var.h> |
61 | |
62 | #include <net/net_osdep.h> |
63 | |
64 | unsigned long in6_maxmtu = 0; |
65 | |
66 | int ip6_auto_linklocal = 1; /* enable by default */ |
67 | |
68 | callout_t in6_tmpaddrtimer_ch; |
69 | |
70 | |
71 | #if 0 |
72 | static int get_hostid_ifid(struct ifnet *, struct in6_addr *); |
73 | #endif |
74 | static int get_rand_ifid(struct in6_addr *); |
75 | static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); |
76 | static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); |
77 | static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); |
78 | static int in6_ifattach_loopback(struct ifnet *); |
79 | |
80 | #define EUI64_GBIT 0x01 |
81 | #define EUI64_UBIT 0x02 |
82 | #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (/*CONSTCOND*/ 0) |
83 | #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) |
84 | #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) |
85 | #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) |
86 | #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) |
87 | |
88 | #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) |
89 | #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) |
90 | |
91 | #define GEN_TEMPID_RETRY_MAX 5 |
92 | |
93 | #if 0 |
94 | /* |
95 | * Generate a last-resort interface identifier from hostid. |
96 | * works only for certain architectures (like sparc). |
97 | * also, using hostid itself may constitute a privacy threat, much worse |
98 | * than MAC addresses (hostids are used for software licensing). |
99 | * maybe we should use MD5(hostid) instead. |
100 | * |
101 | * in6 - upper 64bits are preserved |
102 | */ |
103 | static int |
104 | get_hostid_ifid(struct ifnet *ifp, struct in6_addr *in6) |
105 | { |
106 | int off, len; |
107 | static const uint8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; |
108 | static const uint8_t allone[8] = |
109 | { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
110 | |
111 | if (!hostid) |
112 | return -1; |
113 | |
114 | /* get up to 8 bytes from the hostid field - should we get */ |
115 | len = (sizeof(hostid) > 8) ? 8 : sizeof(hostid); |
116 | off = sizeof(*in6) - len; |
117 | memcpy(&in6->s6_addr[off], &hostid, len); |
118 | |
119 | /* make sure we do not return anything bogus */ |
120 | if (memcmp(&in6->s6_addr[8], allzero, sizeof(allzero))) |
121 | return -1; |
122 | if (memcmp(&in6->s6_addr[8], allone, sizeof(allone))) |
123 | return -1; |
124 | |
125 | /* make sure to set "u" bit to local, and "g" bit to individual. */ |
126 | in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ |
127 | in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ |
128 | |
129 | /* convert EUI64 into IPv6 interface identifier */ |
130 | EUI64_TO_IFID(in6); |
131 | |
132 | return 0; |
133 | } |
134 | #endif |
135 | |
136 | /* |
137 | * Generate a last-resort interface identifier, when the machine has no |
138 | * IEEE802/EUI64 address sources. |
139 | * The goal here is to get an interface identifier that is |
140 | * (1) random enough and (2) does not change across reboot. |
141 | * We currently use MD5(hostname) for it. |
142 | */ |
143 | static int |
144 | get_rand_ifid(struct in6_addr *in6) /* upper 64bits are preserved */ |
145 | { |
146 | MD5_CTX ctxt; |
147 | u_int8_t digest[16]; |
148 | |
149 | #if 0 |
150 | /* we need at least several letters as seed for ifid */ |
151 | if (hostnamelen < 3) |
152 | return -1; |
153 | #endif |
154 | |
155 | /* generate 8 bytes of pseudo-random value. */ |
156 | memset(&ctxt, 0, sizeof(ctxt)); |
157 | MD5Init(&ctxt); |
158 | MD5Update(&ctxt, (u_char *)hostname, hostnamelen); |
159 | MD5Final(digest, &ctxt); |
160 | |
161 | /* assumes sizeof(digest) > sizeof(ifid) */ |
162 | memcpy(&in6->s6_addr[8], digest, 8); |
163 | |
164 | /* make sure to set "u" bit to local, and "g" bit to individual. */ |
165 | in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ |
166 | in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ |
167 | |
168 | /* convert EUI64 into IPv6 interface identifier */ |
169 | EUI64_TO_IFID(in6); |
170 | |
171 | return 0; |
172 | } |
173 | |
174 | static int |
175 | generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) |
176 | { |
177 | MD5_CTX ctxt; |
178 | u_int8_t seed[16], digest[16], nullbuf[8]; |
179 | /* |
180 | * interface ID for subnet anycast addresses. |
181 | * XXX: we assume the unicast address range that requires IDs |
182 | * in EUI-64 format. |
183 | */ |
184 | static const uint8_t anycast_id[8] = { 0xfd, 0xff, 0xff, 0xff, |
185 | 0xff, 0xff, 0xff, 0x80 }; |
186 | static const uint8_t isatap_id[4] = { 0x00, 0x00, 0x5e, 0xfe }; |
187 | int badid, retry = 0; |
188 | |
189 | /* If there's no hisotry, start with a random seed. */ |
190 | memset(nullbuf, 0, sizeof(nullbuf)); |
191 | if (memcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { |
192 | cprng_fast(seed, sizeof(seed)); |
193 | } else |
194 | memcpy(seed, seed0, 8); |
195 | |
196 | /* copy the right-most 64-bits of the given address */ |
197 | /* XXX assumption on the size of IFID */ |
198 | memcpy(&seed[8], seed1, 8); |
199 | |
200 | again: |
201 | /* for debugging purposes only */ |
202 | #if 0 |
203 | { |
204 | int i; |
205 | |
206 | printf("generate_tmp_ifid: new randomized ID from: " ); |
207 | for (i = 0; i < 16; i++) |
208 | printf("%02x" , seed[i]); |
209 | printf(" " ); |
210 | } |
211 | #endif |
212 | |
213 | /* generate 16 bytes of pseudo-random value. */ |
214 | memset(&ctxt, 0, sizeof(ctxt)); |
215 | MD5Init(&ctxt); |
216 | MD5Update(&ctxt, seed, sizeof(seed)); |
217 | MD5Final(digest, &ctxt); |
218 | |
219 | /* |
220 | * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (3) |
221 | * Take the left-most 64-bits of the MD5 digest and set bit 6 (the |
222 | * left-most bit is numbered 0) to zero. |
223 | */ |
224 | memcpy(ret, digest, 8); |
225 | ret[0] &= ~EUI64_UBIT; |
226 | |
227 | /* |
228 | * Reject inappropriate identifiers according to |
229 | * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (4) |
230 | * At this moment, we reject following cases: |
231 | * - all 0 identifier |
232 | * - identifiers that conflict with reserved subnet anycast addresses, |
233 | * which are defined in RFC 2526. |
234 | * - identifiers that conflict with ISATAP addresses |
235 | * - identifiers used in our own addresses |
236 | */ |
237 | badid = 0; |
238 | if (memcmp(nullbuf, ret, sizeof(nullbuf)) == 0) |
239 | badid = 1; |
240 | else if (memcmp(anycast_id, ret, 7) == 0 && |
241 | (anycast_id[7] & ret[7]) == anycast_id[7]) { |
242 | badid = 1; |
243 | } else if (memcmp(isatap_id, ret, sizeof(isatap_id)) == 0) |
244 | badid = 1; |
245 | else { |
246 | struct in6_ifaddr *ia; |
247 | int s = pserialize_read_enter(); |
248 | |
249 | IN6_ADDRLIST_READER_FOREACH(ia) { |
250 | if (!memcmp(&ia->ia_addr.sin6_addr.s6_addr[8], |
251 | ret, 8)) { |
252 | badid = 1; |
253 | break; |
254 | } |
255 | } |
256 | pserialize_read_exit(s); |
257 | } |
258 | |
259 | /* |
260 | * In the event that an unacceptable identifier has been generated, |
261 | * restart the process, using the right-most 64 bits of the MD5 digest |
262 | * obtained in place of the history value. |
263 | */ |
264 | if (badid) { |
265 | /* for debugging purposes only */ |
266 | #if 0 |
267 | { |
268 | int i; |
269 | |
270 | printf("unacceptable random ID: " ); |
271 | for (i = 0; i < 16; i++) |
272 | printf("%02x" , digest[i]); |
273 | printf("\n" ); |
274 | } |
275 | #endif |
276 | |
277 | if (++retry < GEN_TEMPID_RETRY_MAX) { |
278 | memcpy(seed, &digest[8], 8); |
279 | goto again; |
280 | } else { |
281 | /* |
282 | * We're so unlucky. Give up for now, and return |
283 | * all 0 IDs to tell the caller not to make a |
284 | * temporary address. |
285 | */ |
286 | nd6log(LOG_NOTICE, "never found a good ID\n" ); |
287 | memset(ret, 0, 8); |
288 | } |
289 | } |
290 | |
291 | /* |
292 | * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (6) |
293 | * Take the rightmost 64-bits of the MD5 digest and save them in |
294 | * stable storage as the history value to be used in the next |
295 | * iteration of the algorithm. |
296 | */ |
297 | memcpy(seed0, &digest[8], 8); |
298 | |
299 | /* for debugging purposes only */ |
300 | #if 0 |
301 | { |
302 | int i; |
303 | |
304 | printf("to: " ); |
305 | for (i = 0; i < 16; i++) |
306 | printf("%02x" , digest[i]); |
307 | printf("\n" ); |
308 | } |
309 | #endif |
310 | |
311 | return 0; |
312 | } |
313 | |
314 | /* |
315 | * Get interface identifier for the specified interface. |
316 | * |
317 | * in6 - upper 64bits are preserved |
318 | */ |
319 | int |
320 | in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) |
321 | { |
322 | struct ifaddr *ifa; |
323 | const struct sockaddr_dl *sdl = NULL; |
324 | const char *addr = NULL; /* XXX gcc 4.8 -Werror=maybe-uninitialized */ |
325 | size_t addrlen = 0; /* XXX gcc 4.8 -Werror=maybe-uninitialized */ |
326 | static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; |
327 | static u_int8_t allone[8] = |
328 | { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; |
329 | int s; |
330 | |
331 | s = pserialize_read_enter(); |
332 | IFADDR_READER_FOREACH(ifa, ifp) { |
333 | const struct sockaddr_dl *tsdl; |
334 | if (ifa->ifa_addr->sa_family != AF_LINK) |
335 | continue; |
336 | tsdl = satocsdl(ifa->ifa_addr); |
337 | if (tsdl == NULL || tsdl->sdl_alen == 0) |
338 | continue; |
339 | if (sdl == NULL || ifa == ifp->if_dl || ifa == ifp->if_hwdl) { |
340 | sdl = tsdl; |
341 | addr = CLLADDR(sdl); |
342 | addrlen = sdl->sdl_alen; |
343 | } |
344 | if (ifa == ifp->if_hwdl) |
345 | break; |
346 | } |
347 | pserialize_read_exit(s); |
348 | |
349 | if (sdl == NULL) |
350 | return -1; |
351 | |
352 | switch (ifp->if_type) { |
353 | case IFT_IEEE1394: |
354 | case IFT_IEEE80211: |
355 | /* IEEE1394 uses 16byte length address starting with EUI64 */ |
356 | if (addrlen > 8) |
357 | addrlen = 8; |
358 | break; |
359 | default: |
360 | break; |
361 | } |
362 | |
363 | /* get EUI64 */ |
364 | switch (ifp->if_type) { |
365 | /* IEEE802/EUI64 cases - what others? */ |
366 | case IFT_ETHER: |
367 | case IFT_FDDI: |
368 | case IFT_ATM: |
369 | case IFT_IEEE1394: |
370 | case IFT_IEEE80211: |
371 | /* look at IEEE802/EUI64 only */ |
372 | if (addrlen != 8 && addrlen != 6) |
373 | return -1; |
374 | |
375 | /* |
376 | * check for invalid MAC address - on bsdi, we see it a lot |
377 | * since wildboar configures all-zero MAC on pccard before |
378 | * card insertion. |
379 | */ |
380 | if (memcmp(addr, allzero, addrlen) == 0) |
381 | return -1; |
382 | if (memcmp(addr, allone, addrlen) == 0) |
383 | return -1; |
384 | |
385 | /* make EUI64 address */ |
386 | if (addrlen == 8) |
387 | memcpy(&in6->s6_addr[8], addr, 8); |
388 | else if (addrlen == 6) { |
389 | in6->s6_addr[8] = addr[0]; |
390 | in6->s6_addr[9] = addr[1]; |
391 | in6->s6_addr[10] = addr[2]; |
392 | in6->s6_addr[11] = 0xff; |
393 | in6->s6_addr[12] = 0xfe; |
394 | in6->s6_addr[13] = addr[3]; |
395 | in6->s6_addr[14] = addr[4]; |
396 | in6->s6_addr[15] = addr[5]; |
397 | } |
398 | break; |
399 | |
400 | case IFT_ARCNET: |
401 | if (addrlen != 1) |
402 | return -1; |
403 | if (!addr[0]) |
404 | return -1; |
405 | |
406 | memset(&in6->s6_addr[8], 0, 8); |
407 | in6->s6_addr[15] = addr[0]; |
408 | |
409 | /* |
410 | * due to insufficient bitwidth, we mark it local. |
411 | */ |
412 | in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ |
413 | in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ |
414 | break; |
415 | |
416 | case IFT_GIF: |
417 | #ifdef IFT_STF |
418 | case IFT_STF: |
419 | #endif |
420 | /* |
421 | * RFC2893 says: "SHOULD use IPv4 address as ifid source". |
422 | * however, IPv4 address is not very suitable as unique |
423 | * identifier source (can be renumbered). |
424 | * we don't do this. |
425 | */ |
426 | return -1; |
427 | |
428 | default: |
429 | return -1; |
430 | } |
431 | |
432 | /* sanity check: g bit must not indicate "group" */ |
433 | if (EUI64_GROUP(in6)) |
434 | return -1; |
435 | |
436 | /* convert EUI64 into IPv6 interface identifier */ |
437 | EUI64_TO_IFID(in6); |
438 | |
439 | /* |
440 | * sanity check: ifid must not be all zero, avoid conflict with |
441 | * subnet router anycast |
442 | */ |
443 | if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && |
444 | memcmp(&in6->s6_addr[9], allzero, 7) == 0) { |
445 | return -1; |
446 | } |
447 | |
448 | return 0; |
449 | } |
450 | |
451 | /* |
452 | * Get interface identifier for the specified interface. If it is not |
453 | * available on ifp0, borrow interface identifier from other information |
454 | * sources. |
455 | * |
456 | * altifp - secondary EUI64 source |
457 | */ |
458 | static int |
459 | get_ifid(struct ifnet *ifp0, struct ifnet *altifp, |
460 | struct in6_addr *in6) |
461 | { |
462 | struct ifnet *ifp; |
463 | int s; |
464 | |
465 | /* first, try to get it from the interface itself */ |
466 | if (in6_get_hw_ifid(ifp0, in6) == 0) { |
467 | nd6log(LOG_DEBUG, "%s: got interface identifier from itself\n" , |
468 | if_name(ifp0)); |
469 | goto success; |
470 | } |
471 | |
472 | /* try secondary EUI64 source. this basically is for ATM PVC */ |
473 | if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { |
474 | nd6log(LOG_DEBUG, "%s: got interface identifier from %s\n" , |
475 | if_name(ifp0), if_name(altifp)); |
476 | goto success; |
477 | } |
478 | |
479 | /* next, try to get it from some other hardware interface */ |
480 | s = pserialize_read_enter(); |
481 | IFNET_READER_FOREACH(ifp) { |
482 | if (ifp == ifp0) |
483 | continue; |
484 | if (in6_get_hw_ifid(ifp, in6) != 0) |
485 | continue; |
486 | |
487 | /* |
488 | * to borrow ifid from other interface, ifid needs to be |
489 | * globally unique |
490 | */ |
491 | if (IFID_UNIVERSAL(in6)) { |
492 | nd6log(LOG_DEBUG, |
493 | "%s: borrow interface identifier from %s\n" , |
494 | if_name(ifp0), if_name(ifp)); |
495 | pserialize_read_exit(s); |
496 | goto success; |
497 | } |
498 | } |
499 | pserialize_read_exit(s); |
500 | |
501 | #if 0 |
502 | /* get from hostid - only for certain architectures */ |
503 | if (get_hostid_ifid(ifp, in6) == 0) { |
504 | nd6log(LOG_DEBUG, |
505 | "%s: interface identifier generated by hostid\n" , |
506 | if_name(ifp0)); |
507 | goto success; |
508 | } |
509 | #endif |
510 | |
511 | /* last resort: get from random number source */ |
512 | if (get_rand_ifid(in6) == 0) { |
513 | nd6log(LOG_DEBUG, |
514 | "%s: interface identifier generated by random number\n" , |
515 | if_name(ifp0)); |
516 | goto success; |
517 | } |
518 | |
519 | printf("%s: failed to get interface identifier\n" , if_name(ifp0)); |
520 | return -1; |
521 | |
522 | success: |
523 | nd6log(LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n" , |
524 | if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], |
525 | in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], |
526 | in6->s6_addr[14], in6->s6_addr[15]); |
527 | return 0; |
528 | } |
529 | |
530 | /* |
531 | * altifp - secondary EUI64 source |
532 | */ |
533 | |
534 | static int |
535 | in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) |
536 | { |
537 | struct in6_aliasreq ifra; |
538 | int error; |
539 | |
540 | /* |
541 | * configure link-local address. |
542 | */ |
543 | memset(&ifra, 0, sizeof(ifra)); |
544 | |
545 | /* |
546 | * in6_update_ifa() does not use ifra_name, but we accurately set it |
547 | * for safety. |
548 | */ |
549 | strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); |
550 | |
551 | ifra.ifra_addr.sin6_family = AF_INET6; |
552 | ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); |
553 | ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); |
554 | ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; |
555 | if ((ifp->if_flags & IFF_LOOPBACK) != 0) { |
556 | ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; |
557 | ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); |
558 | } else { |
559 | if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { |
560 | nd6log(LOG_ERR, |
561 | "%s: no ifid available\n" , if_name(ifp)); |
562 | return -1; |
563 | } |
564 | } |
565 | if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) |
566 | return -1; |
567 | |
568 | sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask64, 0, 0, 0); |
569 | /* link-local addresses should NEVER expire. */ |
570 | ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; |
571 | ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; |
572 | |
573 | /* |
574 | * Now call in6_update_ifa() to do a bunch of procedures to configure |
575 | * a link-local address. We can set the 3rd argument to NULL, because |
576 | * we know there's no other link-local address on the interface |
577 | * and therefore we are adding one (instead of updating one). |
578 | */ |
579 | if ((error = in6_update_ifa(ifp, &ifra, NULL, |
580 | IN6_IFAUPDATE_DADDELAY)) != 0) { |
581 | /* |
582 | * XXX: When the interface does not support IPv6, this call |
583 | * would fail in the SIOCINITIFADDR ioctl. I believe the |
584 | * notification is rather confusing in this case, so just |
585 | * suppress it. (jinmei@kame.net 20010130) |
586 | */ |
587 | if (error != EAFNOSUPPORT) |
588 | nd6log(LOG_NOTICE, |
589 | "failed to configure a link-local address on %s " |
590 | "(errno=%d)\n" , |
591 | if_name(ifp), error); |
592 | return -1; |
593 | } |
594 | |
595 | return 0; |
596 | } |
597 | |
598 | /* |
599 | * ifp - mut be IFT_LOOP |
600 | */ |
601 | |
602 | static int |
603 | in6_ifattach_loopback(struct ifnet *ifp) |
604 | { |
605 | struct in6_aliasreq ifra; |
606 | int error; |
607 | |
608 | memset(&ifra, 0, sizeof(ifra)); |
609 | |
610 | /* |
611 | * in6_update_ifa() does not use ifra_name, but we accurately set it |
612 | * for safety. |
613 | */ |
614 | strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); |
615 | |
616 | sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask128, 0, 0, 0); |
617 | |
618 | /* |
619 | * Always initialize ia_dstaddr (= broadcast address) to loopback |
620 | * address. Follows IPv4 practice - see in_ifinit(). |
621 | */ |
622 | sockaddr_in6_init(&ifra.ifra_dstaddr, &in6addr_loopback, 0, 0, 0); |
623 | |
624 | sockaddr_in6_init(&ifra.ifra_addr, &in6addr_loopback, 0, 0, 0); |
625 | |
626 | /* the loopback address should NEVER expire. */ |
627 | ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; |
628 | ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; |
629 | |
630 | /* we don't need to perform DAD on loopback interfaces. */ |
631 | ifra.ifra_flags |= IN6_IFF_NODAD; |
632 | |
633 | /* |
634 | * We are sure that this is a newly assigned address, so we can set |
635 | * NULL to the 3rd arg. |
636 | */ |
637 | if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { |
638 | nd6log(LOG_ERR, "failed to configure " |
639 | "the loopback address on %s (errno=%d)\n" , |
640 | if_name(ifp), error); |
641 | return -1; |
642 | } |
643 | |
644 | return 0; |
645 | } |
646 | |
647 | /* |
648 | * compute NI group address, based on the current hostname setting. |
649 | * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). |
650 | * |
651 | * when ifp == NULL, the caller is responsible for filling scopeid. |
652 | */ |
653 | int |
654 | in6_nigroup(struct ifnet *ifp, const char *name, int namelen, |
655 | struct sockaddr_in6 *sa6) |
656 | { |
657 | const char *p; |
658 | u_int8_t *q; |
659 | MD5_CTX ctxt; |
660 | u_int8_t digest[16]; |
661 | u_int8_t l; |
662 | u_int8_t n[64]; /* a single label must not exceed 63 chars */ |
663 | |
664 | if (!namelen || !name) |
665 | return -1; |
666 | |
667 | p = name; |
668 | while (p && *p && *p != '.' && p - name < namelen) |
669 | p++; |
670 | if (p - name > sizeof(n) - 1) |
671 | return -1; /* label too long */ |
672 | l = p - name; |
673 | strncpy((char *)n, name, l); |
674 | n[(int)l] = '\0'; |
675 | for (q = n; *q; q++) { |
676 | if ('A' <= *q && *q <= 'Z') |
677 | *q = *q - 'A' + 'a'; |
678 | } |
679 | |
680 | /* generate 8 bytes of pseudo-random value. */ |
681 | memset(&ctxt, 0, sizeof(ctxt)); |
682 | MD5Init(&ctxt); |
683 | MD5Update(&ctxt, &l, sizeof(l)); |
684 | MD5Update(&ctxt, n, l); |
685 | MD5Final(digest, &ctxt); |
686 | |
687 | memset(sa6, 0, sizeof(*sa6)); |
688 | sa6->sin6_family = AF_INET6; |
689 | sa6->sin6_len = sizeof(*sa6); |
690 | sa6->sin6_addr.s6_addr16[0] = htons(0xff02); |
691 | sa6->sin6_addr.s6_addr8[11] = 2; |
692 | memcpy(&sa6->sin6_addr.s6_addr32[3], digest, |
693 | sizeof(sa6->sin6_addr.s6_addr32[3])); |
694 | if (in6_setscope(&sa6->sin6_addr, ifp, NULL)) |
695 | return -1; /* XXX: should not fail */ |
696 | |
697 | return 0; |
698 | } |
699 | |
700 | /* |
701 | * XXX multiple loopback interface needs more care. for instance, |
702 | * nodelocal address needs to be configured onto only one of them. |
703 | * XXX multiple link-local address case |
704 | * |
705 | * altifp - secondary EUI64 source |
706 | */ |
707 | void |
708 | in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) |
709 | { |
710 | struct in6_ifaddr *ia; |
711 | struct in6_addr in6; |
712 | |
713 | /* some of the interfaces are inherently not IPv6 capable */ |
714 | switch (ifp->if_type) { |
715 | case IFT_BRIDGE: |
716 | #ifdef IFT_PFLOG |
717 | case IFT_PFLOG: |
718 | #endif |
719 | #ifdef IFT_PFSYNC |
720 | case IFT_PFSYNC: |
721 | #endif |
722 | ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; |
723 | ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; |
724 | return; |
725 | } |
726 | |
727 | /* |
728 | * if link mtu is too small, don't try to configure IPv6. |
729 | * remember there could be some link-layer that has special |
730 | * fragmentation logic. |
731 | */ |
732 | if (ifp->if_mtu < IPV6_MMTU) { |
733 | nd6log(LOG_INFO, "%s has too small MTU, IPv6 not enabled\n" , |
734 | if_name(ifp)); |
735 | return; |
736 | } |
737 | |
738 | /* create a multicast kludge storage (if we have not had one) */ |
739 | in6_createmkludge(ifp); |
740 | |
741 | /* |
742 | * quirks based on interface type |
743 | */ |
744 | switch (ifp->if_type) { |
745 | #ifdef IFT_STF |
746 | case IFT_STF: |
747 | /* |
748 | * 6to4 interface is a very special kind of beast. |
749 | * no multicast, no linklocal. RFC2529 specifies how to make |
750 | * linklocals for 6to4 interface, but there's no use and |
751 | * it is rather harmful to have one. |
752 | */ |
753 | ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; |
754 | return; |
755 | #endif |
756 | case IFT_CARP: |
757 | return; |
758 | default: |
759 | break; |
760 | } |
761 | |
762 | /* |
763 | * usually, we require multicast capability to the interface |
764 | */ |
765 | if ((ifp->if_flags & IFF_MULTICAST) == 0) { |
766 | nd6log(LOG_INFO, |
767 | "%s is not multicast capable, IPv6 not enabled\n" , |
768 | if_name(ifp)); |
769 | return; |
770 | } |
771 | |
772 | /* |
773 | * assign loopback address for loopback interface. |
774 | * XXX multiple loopback interface case. |
775 | */ |
776 | if ((ifp->if_flags & IFF_LOOPBACK) != 0) { |
777 | int s = pserialize_read_enter(); |
778 | in6 = in6addr_loopback; |
779 | if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { |
780 | if (in6_ifattach_loopback(ifp) != 0) { |
781 | pserialize_read_exit(s); |
782 | return; |
783 | } |
784 | } |
785 | pserialize_read_exit(s); |
786 | } |
787 | |
788 | /* |
789 | * assign a link-local address, if there's none. |
790 | */ |
791 | if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && |
792 | ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { |
793 | int s = pserialize_read_enter(); |
794 | ia = in6ifa_ifpforlinklocal(ifp, 0); |
795 | if (ia == NULL && in6_ifattach_linklocal(ifp, altifp) != 0) { |
796 | printf("%s: cannot assign link-local address\n" , |
797 | ifp->if_xname); |
798 | } |
799 | pserialize_read_exit(s); |
800 | } |
801 | } |
802 | |
803 | /* |
804 | * NOTE: in6_ifdetach() does not support loopback if at this moment. |
805 | * We don't need this function in bsdi, because interfaces are never removed |
806 | * from the ifnet list in bsdi. |
807 | */ |
808 | void |
809 | in6_ifdetach(struct ifnet *ifp) |
810 | { |
811 | |
812 | /* remove ip6_mrouter stuff */ |
813 | ip6_mrouter_detach(ifp); |
814 | |
815 | /* remove neighbor management table */ |
816 | nd6_purge(ifp, NULL); |
817 | |
818 | /* nuke any of IPv6 addresses we have */ |
819 | if_purgeaddrs(ifp, AF_INET6, in6_purgeaddr); |
820 | |
821 | /* cleanup multicast address kludge table, if there is any */ |
822 | in6_purgemkludge(ifp); |
823 | |
824 | /* |
825 | * remove neighbor management table. we call it twice just to make |
826 | * sure we nuke everything. maybe we need just one call. |
827 | * XXX: since the first call did not release addresses, some prefixes |
828 | * might remain. We should call nd6_purge() again to release the |
829 | * prefixes after removing all addresses above. |
830 | * (Or can we just delay calling nd6_purge until at this point?) |
831 | */ |
832 | nd6_purge(ifp, NULL); |
833 | } |
834 | |
835 | int |
836 | in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, |
837 | const u_int8_t *baseid, int generate) |
838 | { |
839 | u_int8_t nullbuf[8]; |
840 | struct nd_ifinfo *ndi = ND_IFINFO(ifp); |
841 | |
842 | memset(nullbuf, 0, sizeof(nullbuf)); |
843 | if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { |
844 | /* we've never created a random ID. Create a new one. */ |
845 | generate = 1; |
846 | } |
847 | |
848 | if (generate) { |
849 | memcpy(ndi->randomseed1, baseid, sizeof(ndi->randomseed1)); |
850 | |
851 | /* generate_tmp_ifid will update seedn and buf */ |
852 | (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, |
853 | ndi->randomid); |
854 | } |
855 | memcpy(retbuf, ndi->randomid, 8); |
856 | if (generate && memcmp(retbuf, nullbuf, sizeof(nullbuf)) == 0) { |
857 | /* generate_tmp_ifid could not found a good ID. */ |
858 | return -1; |
859 | } |
860 | |
861 | return 0; |
862 | } |
863 | |
864 | void |
865 | in6_tmpaddrtimer(void *ignored_arg) |
866 | { |
867 | struct nd_ifinfo *ndi; |
868 | u_int8_t nullbuf[8]; |
869 | struct ifnet *ifp; |
870 | int s; |
871 | |
872 | mutex_enter(softnet_lock); |
873 | KERNEL_LOCK(1, NULL); |
874 | |
875 | callout_reset(&in6_tmpaddrtimer_ch, |
876 | (ip6_temp_preferred_lifetime - ip6_desync_factor - |
877 | ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); |
878 | |
879 | memset(nullbuf, 0, sizeof(nullbuf)); |
880 | s = pserialize_read_enter(); |
881 | IFNET_READER_FOREACH(ifp) { |
882 | ndi = ND_IFINFO(ifp); |
883 | if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { |
884 | /* |
885 | * We've been generating a random ID on this interface. |
886 | * Create a new one. |
887 | */ |
888 | (void)generate_tmp_ifid(ndi->randomseed0, |
889 | ndi->randomseed1, ndi->randomid); |
890 | } |
891 | } |
892 | pserialize_read_exit(s); |
893 | |
894 | KERNEL_UNLOCK_ONE(NULL); |
895 | mutex_exit(softnet_lock); |
896 | } |
897 | |