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1.1 nbrk 1: /* $OpenBSD: in6.c,v 1.72 2006/11/17 01:11:23 itojun Exp $ */
2: /* $KAME: in6.c,v 1.372 2004/06/14 08:14:21 itojun Exp $ */
3:
4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the project nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: /*
34: * Copyright (c) 1982, 1986, 1991, 1993
35: * The Regents of the University of California. All rights reserved.
36: *
37: * Redistribution and use in source and binary forms, with or without
38: * modification, are permitted provided that the following conditions
39: * are met:
40: * 1. Redistributions of source code must retain the above copyright
41: * notice, this list of conditions and the following disclaimer.
42: * 2. Redistributions in binary form must reproduce the above copyright
43: * notice, this list of conditions and the following disclaimer in the
44: * documentation and/or other materials provided with the distribution.
45: * 3. Neither the name of the University nor the names of its contributors
46: * may be used to endorse or promote products derived from this software
47: * without specific prior written permission.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59: * SUCH DAMAGE.
60: *
61: * @(#)in.c 8.2 (Berkeley) 11/15/93
62: */
63:
64: #include <sys/param.h>
65: #include <sys/ioctl.h>
66: #include <sys/errno.h>
67: #include <sys/malloc.h>
68: #include <sys/socket.h>
69: #include <sys/socketvar.h>
70: #include <sys/sockio.h>
71: #include <sys/systm.h>
72: #include <sys/proc.h>
73: #include <sys/time.h>
74: #include <sys/kernel.h>
75: #include <sys/syslog.h>
76:
77: #include <net/if.h>
78: #include <net/if_types.h>
79: #include <net/route.h>
80: #include <net/if_dl.h>
81:
82: #include <netinet/in.h>
83: #include <netinet/in_var.h>
84: #include <netinet/if_ether.h>
85:
86: #include <netinet/ip6.h>
87: #include <netinet6/ip6_var.h>
88: #include <netinet6/nd6.h>
89: #include <netinet6/mld6_var.h>
90: #ifdef MROUTING
91: #include <netinet6/ip6_mroute.h>
92: #endif
93: #include <netinet6/in6_ifattach.h>
94:
95: /* backward compatibility for a while... */
96: #define COMPAT_IN6IFIOCTL
97:
98: /*
99: * Definitions of some constant IP6 addresses.
100: */
101: const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
102: const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
103: const struct in6_addr in6addr_intfacelocal_allnodes =
104: IN6ADDR_INTFACELOCAL_ALLNODES_INIT;
105: const struct in6_addr in6addr_linklocal_allnodes =
106: IN6ADDR_LINKLOCAL_ALLNODES_INIT;
107: const struct in6_addr in6addr_linklocal_allrouters =
108: IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
109:
110: const struct in6_addr in6mask0 = IN6MASK0;
111: const struct in6_addr in6mask32 = IN6MASK32;
112: const struct in6_addr in6mask64 = IN6MASK64;
113: const struct in6_addr in6mask96 = IN6MASK96;
114: const struct in6_addr in6mask128 = IN6MASK128;
115:
116: static int in6_lifaddr_ioctl(struct socket *, u_long, caddr_t,
117: struct ifnet *, struct proc *);
118: static int in6_ifinit(struct ifnet *, struct in6_ifaddr *,
119: struct sockaddr_in6 *, int);
120: static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
121:
122: const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6,
123: 0, 0, IN6ADDR_ANY_INIT, 0};
124:
125: /*
126: * This structure is used to keep track of in6_multi chains which belong to
127: * deleted interface addresses.
128: */
129: static LIST_HEAD(, multi6_kludge) in6_mk; /* XXX BSS initialization */
130:
131: struct multi6_kludge {
132: LIST_ENTRY(multi6_kludge) mk_entry;
133: struct ifnet *mk_ifp;
134: struct in6_multihead mk_head;
135: };
136:
137: /*
138: * Subroutine for in6_ifaddloop() and in6_ifremloop().
139: * This routine does actual work.
140: */
141: static void
142: in6_ifloop_request(int cmd, struct ifaddr *ifa)
143: {
144: struct sockaddr_in6 lo_sa;
145: struct sockaddr_in6 all1_sa;
146: struct rtentry *nrt = NULL;
147: int e;
148:
149: bzero(&lo_sa, sizeof(lo_sa));
150: bzero(&all1_sa, sizeof(all1_sa));
151: lo_sa.sin6_family = all1_sa.sin6_family = AF_INET6;
152: lo_sa.sin6_len = all1_sa.sin6_len = sizeof(struct sockaddr_in6);
153: lo_sa.sin6_addr = in6addr_loopback;
154: all1_sa.sin6_addr = in6mask128;
155:
156: /*
157: * We specify the address itself as the gateway, and set the
158: * RTF_LLINFO flag, so that the corresponding host route would have
159: * the flag, and thus applications that assume traditional behavior
160: * would be happy. Note that we assume the caller of the function
161: * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest,
162: * which changes the outgoing interface to the loopback interface.
163: * XXX only table 0 for now
164: */
165: e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr,
166: (struct sockaddr *)&all1_sa, RTF_UP|RTF_HOST|RTF_LLINFO, &nrt, 0);
167: if (e != 0) {
168: log(LOG_ERR, "in6_ifloop_request: "
169: "%s operation failed for %s (errno=%d)\n",
170: cmd == RTM_ADD ? "ADD" : "DELETE",
171: ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr),
172: e);
173: }
174:
175: /*
176: * Make sure rt_ifa be equal to IFA, the second argument of the
177: * function.
178: * We need this because when we refer to rt_ifa->ia6_flags in
179: * ip6_input, we assume that the rt_ifa points to the address instead
180: * of the loopback address.
181: */
182: if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa) {
183: IFAFREE(nrt->rt_ifa);
184: ifa->ifa_refcnt++;
185: nrt->rt_ifa = ifa;
186: }
187:
188: /*
189: * Report the addition/removal of the address to the routing socket.
190: * XXX: since we called rtinit for a p2p interface with a destination,
191: * we end up reporting twice in such a case. Should we rather
192: * omit the second report?
193: */
194: if (nrt) {
195: rt_newaddrmsg(cmd, ifa, e, nrt);
196: if (cmd == RTM_DELETE) {
197: if (nrt->rt_refcnt <= 0) {
198: /* XXX: we should free the entry ourselves. */
199: nrt->rt_refcnt++;
200: rtfree(nrt);
201: }
202: } else {
203: /* the cmd must be RTM_ADD here */
204: nrt->rt_refcnt--;
205: }
206: }
207: }
208:
209: /*
210: * Add ownaddr as loopback rtentry. We previously add the route only if
211: * necessary (ex. on a p2p link). However, since we now manage addresses
212: * separately from prefixes, we should always add the route. We can't
213: * rely on the cloning mechanism from the corresponding interface route
214: * any more.
215: */
216: void
217: in6_ifaddloop(struct ifaddr *ifa)
218: {
219: struct rtentry *rt;
220:
221: /* If there is no loopback entry, allocate one. */
222: rt = rtalloc1(ifa->ifa_addr, 0, 0);
223: if (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 ||
224: (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0)
225: in6_ifloop_request(RTM_ADD, ifa);
226: if (rt)
227: rt->rt_refcnt--;
228: }
229:
230: /*
231: * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(),
232: * if it exists.
233: */
234: void
235: in6_ifremloop(struct ifaddr *ifa)
236: {
237: struct in6_ifaddr *ia;
238: struct rtentry *rt;
239: int ia_count = 0;
240:
241: /*
242: * Some of BSD variants do not remove cloned routes
243: * from an interface direct route, when removing the direct route
244: * (see comments in net/net_osdep.h). Even for variants that do remove
245: * cloned routes, they could fail to remove the cloned routes when
246: * we handle multple addresses that share a common prefix.
247: * So, we should remove the route corresponding to the deleted address.
248: */
249:
250: /*
251: * Delete the entry only if exact one ifa exists. More than one ifa
252: * can exist if we assign a same single address to multiple
253: * (probably p2p) interfaces.
254: * XXX: we should avoid such a configuration in IPv6...
255: */
256: for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
257: if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) {
258: ia_count++;
259: if (ia_count > 1)
260: break;
261: }
262: }
263:
264: if (ia_count == 1) {
265: /*
266: * Before deleting, check if a corresponding loopbacked host
267: * route surely exists. With this check, we can avoid to
268: * delete an interface direct route whose destination is same
269: * as the address being removed. This can happen when removing
270: * a subnet-router anycast address on an interface attahced
271: * to a shared medium.
272: */
273: rt = rtalloc1(ifa->ifa_addr, 0, 0);
274: if (rt != NULL && (rt->rt_flags & RTF_HOST) != 0 &&
275: (rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
276: rt->rt_refcnt--;
277: in6_ifloop_request(RTM_DELETE, ifa);
278: }
279: }
280: }
281:
282: int
283: in6_mask2len(mask, lim0)
284: struct in6_addr *mask;
285: u_char *lim0;
286: {
287: int x = 0, y;
288: u_char *lim = lim0, *p;
289:
290: /* ignore the scope_id part */
291: if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
292: lim = (u_char *)mask + sizeof(*mask);
293: for (p = (u_char *)mask; p < lim; x++, p++) {
294: if (*p != 0xff)
295: break;
296: }
297: y = 0;
298: if (p < lim) {
299: for (y = 0; y < 8; y++) {
300: if ((*p & (0x80 >> y)) == 0)
301: break;
302: }
303: }
304:
305: /*
306: * when the limit pointer is given, do a stricter check on the
307: * remaining bits.
308: */
309: if (p < lim) {
310: if (y != 0 && (*p & (0x00ff >> y)) != 0)
311: return (-1);
312: for (p = p + 1; p < lim; p++)
313: if (*p != 0)
314: return (-1);
315: }
316:
317: return x * 8 + y;
318: }
319:
320: #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
321: #define ia62ifa(ia6) (&((ia6)->ia_ifa))
322:
323: int
324: in6_control(so, cmd, data, ifp, p)
325: struct socket *so;
326: u_long cmd;
327: caddr_t data;
328: struct ifnet *ifp;
329: struct proc *p;
330: {
331: struct in6_ifreq *ifr = (struct in6_ifreq *)data;
332: struct in6_ifaddr *ia = NULL;
333: struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
334: struct sockaddr_in6 *sa6;
335: int privileged;
336:
337: privileged = 0;
338: if ((so->so_state & SS_PRIV) != 0)
339: privileged++;
340:
341: #ifdef MROUTING
342: switch (cmd) {
343: case SIOCGETSGCNT_IN6:
344: case SIOCGETMIFCNT_IN6:
345: return (mrt6_ioctl(cmd, data));
346: }
347: #endif
348:
349: if (ifp == NULL)
350: return (EOPNOTSUPP);
351:
352: switch (cmd) {
353: case SIOCSNDFLUSH_IN6:
354: case SIOCSPFXFLUSH_IN6:
355: case SIOCSRTRFLUSH_IN6:
356: case SIOCSDEFIFACE_IN6:
357: case SIOCSIFINFO_FLAGS:
358: if (!privileged)
359: return (EPERM);
360: /* FALLTHROUGH */
361: case OSIOCGIFINFO_IN6:
362: case SIOCGIFINFO_IN6:
363: case SIOCGDRLST_IN6:
364: case SIOCGPRLST_IN6:
365: case SIOCGNBRINFO_IN6:
366: case SIOCGDEFIFACE_IN6:
367: return (nd6_ioctl(cmd, data, ifp));
368: }
369:
370: switch (cmd) {
371: case SIOCSIFPREFIX_IN6:
372: case SIOCDIFPREFIX_IN6:
373: case SIOCAIFPREFIX_IN6:
374: case SIOCCIFPREFIX_IN6:
375: case SIOCSGIFPREFIX_IN6:
376: case SIOCGIFPREFIX_IN6:
377: log(LOG_NOTICE,
378: "prefix ioctls are now invalidated. "
379: "please use ifconfig.\n");
380: return (EOPNOTSUPP);
381: }
382:
383: switch (cmd) {
384: case SIOCALIFADDR:
385: case SIOCDLIFADDR:
386: if (!privileged)
387: return (EPERM);
388: /* FALLTHROUGH */
389: case SIOCGLIFADDR:
390: return in6_lifaddr_ioctl(so, cmd, data, ifp, p);
391: }
392:
393: /*
394: * Find address for this interface, if it exists.
395: *
396: * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
397: * only, and used the first interface address as the target of other
398: * operations (without checking ifra_addr). This was because netinet
399: * code/API assumed at most 1 interface address per interface.
400: * Since IPv6 allows a node to assign multiple addresses
401: * on a single interface, we almost always look and check the
402: * presence of ifra_addr, and reject invalid ones here.
403: * It also decreases duplicated code among SIOC*_IN6 operations.
404: */
405: switch (cmd) {
406: case SIOCAIFADDR_IN6:
407: case SIOCSIFPHYADDR_IN6:
408: sa6 = &ifra->ifra_addr;
409: break;
410: case SIOCSIFADDR_IN6:
411: case SIOCGIFADDR_IN6:
412: case SIOCSIFDSTADDR_IN6:
413: case SIOCSIFNETMASK_IN6:
414: case SIOCGIFDSTADDR_IN6:
415: case SIOCGIFNETMASK_IN6:
416: case SIOCDIFADDR_IN6:
417: case SIOCGIFPSRCADDR_IN6:
418: case SIOCGIFPDSTADDR_IN6:
419: case SIOCGIFAFLAG_IN6:
420: case SIOCSNDFLUSH_IN6:
421: case SIOCSPFXFLUSH_IN6:
422: case SIOCSRTRFLUSH_IN6:
423: case SIOCGIFALIFETIME_IN6:
424: case SIOCSIFALIFETIME_IN6:
425: case SIOCGIFSTAT_IN6:
426: case SIOCGIFSTAT_ICMP6:
427: sa6 = &ifr->ifr_addr;
428: break;
429: default:
430: sa6 = NULL;
431: break;
432: }
433: if (sa6 && sa6->sin6_family == AF_INET6) {
434: if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) {
435: if (sa6->sin6_addr.s6_addr16[1] == 0) {
436: /* link ID is not embedded by the user */
437: sa6->sin6_addr.s6_addr16[1] =
438: htons(ifp->if_index);
439: } else if (sa6->sin6_addr.s6_addr16[1] !=
440: htons(ifp->if_index)) {
441: return (EINVAL); /* link ID contradicts */
442: }
443: if (sa6->sin6_scope_id) {
444: if (sa6->sin6_scope_id !=
445: (u_int32_t)ifp->if_index)
446: return (EINVAL);
447: sa6->sin6_scope_id = 0; /* XXX: good way? */
448: }
449: }
450: ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
451: } else
452: ia = NULL;
453:
454: switch (cmd) {
455: case SIOCSIFADDR_IN6:
456: case SIOCSIFDSTADDR_IN6:
457: case SIOCSIFNETMASK_IN6:
458: /*
459: * Since IPv6 allows a node to assign multiple addresses
460: * on a single interface, SIOCSIFxxx ioctls are deprecated.
461: */
462: return (EINVAL);
463:
464: case SIOCDIFADDR_IN6:
465: /*
466: * for IPv4, we look for existing in_ifaddr here to allow
467: * "ifconfig if0 delete" to remove the first IPv4 address on
468: * the interface. For IPv6, as the spec allows multiple
469: * interface address from the day one, we consider "remove the
470: * first one" semantics to be not preferable.
471: */
472: if (ia == NULL)
473: return (EADDRNOTAVAIL);
474: /* FALLTHROUGH */
475: case SIOCAIFADDR_IN6:
476: /*
477: * We always require users to specify a valid IPv6 address for
478: * the corresponding operation.
479: */
480: if (ifra->ifra_addr.sin6_family != AF_INET6 ||
481: ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6))
482: return (EAFNOSUPPORT);
483: if (!privileged)
484: return (EPERM);
485:
486: break;
487:
488: case SIOCGIFADDR_IN6:
489: /* This interface is basically deprecated. use SIOCGIFCONF. */
490: /* FALLTHROUGH */
491: case SIOCGIFAFLAG_IN6:
492: case SIOCGIFNETMASK_IN6:
493: case SIOCGIFDSTADDR_IN6:
494: case SIOCGIFALIFETIME_IN6:
495: /* must think again about its semantics */
496: if (ia == NULL)
497: return (EADDRNOTAVAIL);
498: break;
499: case SIOCSIFALIFETIME_IN6:
500: {
501: struct in6_addrlifetime *lt;
502:
503: if (!privileged)
504: return (EPERM);
505: if (ia == NULL)
506: return (EADDRNOTAVAIL);
507: /* sanity for overflow - beware unsigned */
508: lt = &ifr->ifr_ifru.ifru_lifetime;
509: if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME
510: && lt->ia6t_vltime + time_second < time_second) {
511: return EINVAL;
512: }
513: if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME
514: && lt->ia6t_pltime + time_second < time_second) {
515: return EINVAL;
516: }
517: break;
518: }
519: }
520:
521: switch (cmd) {
522:
523: case SIOCGIFADDR_IN6:
524: ifr->ifr_addr = ia->ia_addr;
525: break;
526:
527: case SIOCGIFDSTADDR_IN6:
528: if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
529: return (EINVAL);
530: /*
531: * XXX: should we check if ifa_dstaddr is NULL and return
532: * an error?
533: */
534: ifr->ifr_dstaddr = ia->ia_dstaddr;
535: break;
536:
537: case SIOCGIFNETMASK_IN6:
538: ifr->ifr_addr = ia->ia_prefixmask;
539: break;
540:
541: case SIOCGIFAFLAG_IN6:
542: ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
543: break;
544:
545: case SIOCGIFSTAT_IN6:
546: if (ifp == NULL)
547: return EINVAL;
548: bzero(&ifr->ifr_ifru.ifru_stat,
549: sizeof(ifr->ifr_ifru.ifru_stat));
550: ifr->ifr_ifru.ifru_stat =
551: *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
552: break;
553:
554: case SIOCGIFSTAT_ICMP6:
555: if (ifp == NULL)
556: return EINVAL;
557: bzero(&ifr->ifr_ifru.ifru_icmp6stat,
558: sizeof(ifr->ifr_ifru.ifru_icmp6stat));
559: ifr->ifr_ifru.ifru_icmp6stat =
560: *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
561: break;
562:
563: case SIOCGIFALIFETIME_IN6:
564: ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
565: if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
566: time_t maxexpire;
567: struct in6_addrlifetime *retlt =
568: &ifr->ifr_ifru.ifru_lifetime;
569:
570: /*
571: * XXX: adjust expiration time assuming time_t is
572: * signed.
573: */
574: maxexpire = (-1) &
575: ~(1 << ((sizeof(maxexpire) * 8) - 1));
576: if (ia->ia6_lifetime.ia6t_vltime <
577: maxexpire - ia->ia6_updatetime) {
578: retlt->ia6t_expire = ia->ia6_updatetime +
579: ia->ia6_lifetime.ia6t_vltime;
580: } else
581: retlt->ia6t_expire = maxexpire;
582: }
583: if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
584: time_t maxexpire;
585: struct in6_addrlifetime *retlt =
586: &ifr->ifr_ifru.ifru_lifetime;
587:
588: /*
589: * XXX: adjust expiration time assuming time_t is
590: * signed.
591: */
592: maxexpire = (-1) &
593: ~(1 << ((sizeof(maxexpire) * 8) - 1));
594: if (ia->ia6_lifetime.ia6t_pltime <
595: maxexpire - ia->ia6_updatetime) {
596: retlt->ia6t_preferred = ia->ia6_updatetime +
597: ia->ia6_lifetime.ia6t_pltime;
598: } else
599: retlt->ia6t_preferred = maxexpire;
600: }
601: break;
602:
603: case SIOCSIFALIFETIME_IN6:
604: ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
605: /* for sanity */
606: if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
607: ia->ia6_lifetime.ia6t_expire =
608: time_second + ia->ia6_lifetime.ia6t_vltime;
609: } else
610: ia->ia6_lifetime.ia6t_expire = 0;
611: if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
612: ia->ia6_lifetime.ia6t_preferred =
613: time_second + ia->ia6_lifetime.ia6t_pltime;
614: } else
615: ia->ia6_lifetime.ia6t_preferred = 0;
616: break;
617:
618: case SIOCAIFADDR_IN6:
619: {
620: int i, error = 0;
621: struct nd_prefix pr0, *pr;
622:
623: /* reject read-only flags */
624: if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 ||
625: (ifra->ifra_flags & IN6_IFF_DETACHED) != 0 ||
626: (ifra->ifra_flags & IN6_IFF_NODAD) != 0 ||
627: (ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0) {
628: return (EINVAL);
629: }
630: /*
631: * first, make or update the interface address structure,
632: * and link it to the list.
633: */
634: if ((error = in6_update_ifa(ifp, ifra, ia)) != 0)
635: return (error);
636: if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
637: == NULL) {
638: /*
639: * this can happen when the user specify the 0 valid
640: * lifetime.
641: */
642: break;
643: }
644:
645: /*
646: * then, make the prefix on-link on the interface.
647: * XXX: we'd rather create the prefix before the address, but
648: * we need at least one address to install the corresponding
649: * interface route, so we configure the address first.
650: */
651:
652: /*
653: * convert mask to prefix length (prefixmask has already
654: * been validated in in6_update_ifa().
655: */
656: bzero(&pr0, sizeof(pr0));
657: pr0.ndpr_ifp = ifp;
658: pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
659: NULL);
660: if (pr0.ndpr_plen == 128) {
661: break; /* we don't need to install a host route. */
662: }
663: pr0.ndpr_prefix = ifra->ifra_addr;
664: pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr;
665: /* apply the mask for safety. */
666: for (i = 0; i < 4; i++) {
667: pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
668: ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
669: }
670: /*
671: * XXX: since we don't have an API to set prefix (not address)
672: * lifetimes, we just use the same lifetimes as addresses.
673: * The (temporarily) installed lifetimes can be overridden by
674: * later advertised RAs (when accept_rtadv is non 0), which is
675: * an intended behavior.
676: */
677: pr0.ndpr_raf_onlink = 1; /* should be configurable? */
678: pr0.ndpr_raf_auto =
679: ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
680: pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
681: pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
682:
683: /* add the prefix if not yet. */
684: if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
685: /*
686: * nd6_prelist_add will install the corresponding
687: * interface route.
688: */
689: if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
690: return (error);
691: if (pr == NULL) {
692: log(LOG_ERR, "nd6_prelist_add succeeded but "
693: "no prefix\n");
694: return (EINVAL); /* XXX panic here? */
695: }
696: }
697:
698: /* relate the address to the prefix */
699: if (ia->ia6_ndpr == NULL) {
700: ia->ia6_ndpr = pr;
701: pr->ndpr_refcnt++;
702: }
703:
704: /*
705: * this might affect the status of autoconfigured addresses,
706: * that is, this address might make other addresses detached.
707: */
708: pfxlist_onlink_check();
709:
710: dohooks(ifp->if_addrhooks, 0);
711: break;
712: }
713:
714: case SIOCDIFADDR_IN6:
715: {
716: int i = 0, purgeprefix = 0;
717: struct nd_prefix pr0, *pr = NULL;
718:
719: /*
720: * If the address being deleted is the only one that owns
721: * the corresponding prefix, expire the prefix as well.
722: * XXX: theoretically, we don't have to worry about such
723: * relationship, since we separate the address management
724: * and the prefix management. We do this, however, to provide
725: * as much backward compatibility as possible in terms of
726: * the ioctl operation.
727: */
728: bzero(&pr0, sizeof(pr0));
729: pr0.ndpr_ifp = ifp;
730: pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr,
731: NULL);
732: if (pr0.ndpr_plen == 128)
733: goto purgeaddr;
734: pr0.ndpr_prefix = ia->ia_addr;
735: pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr;
736: for (i = 0; i < 4; i++) {
737: pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
738: ia->ia_prefixmask.sin6_addr.s6_addr32[i];
739: }
740: if ((pr = nd6_prefix_lookup(&pr0)) != NULL &&
741: pr == ia->ia6_ndpr) {
742: pr->ndpr_refcnt--;
743: if (pr->ndpr_refcnt == 0)
744: purgeprefix = 1;
745: }
746:
747: purgeaddr:
748: in6_purgeaddr(&ia->ia_ifa);
749: if (pr && purgeprefix)
750: prelist_remove(pr);
751: dohooks(ifp->if_addrhooks, 0);
752: break;
753: }
754:
755: default:
756: if (ifp == NULL || ifp->if_ioctl == 0)
757: return (EOPNOTSUPP);
758: return ((*ifp->if_ioctl)(ifp, cmd, data));
759: }
760:
761: return (0);
762: }
763:
764: /*
765: * Update parameters of an IPv6 interface address.
766: * If necessary, a new entry is created and linked into address chains.
767: * This function is separated from in6_control().
768: * XXX: should this be performed under splnet()?
769: */
770: int
771: in6_update_ifa(ifp, ifra, ia)
772: struct ifnet *ifp;
773: struct in6_aliasreq *ifra;
774: struct in6_ifaddr *ia;
775: {
776: int error = 0, hostIsNew = 0, plen = -1;
777: struct in6_ifaddr *oia;
778: struct sockaddr_in6 dst6;
779: struct in6_addrlifetime *lt;
780: struct in6_multi_mship *imm;
781: struct rtentry *rt;
782:
783: /* Validate parameters */
784: if (ifp == NULL || ifra == NULL) /* this maybe redundant */
785: return (EINVAL);
786:
787: /*
788: * The destination address for a p2p link must have a family
789: * of AF_UNSPEC or AF_INET6.
790: */
791: if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
792: ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
793: ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
794: return (EAFNOSUPPORT);
795: /*
796: * validate ifra_prefixmask. don't check sin6_family, netmask
797: * does not carry fields other than sin6_len.
798: */
799: if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
800: return (EINVAL);
801: /*
802: * Because the IPv6 address architecture is classless, we require
803: * users to specify a (non 0) prefix length (mask) for a new address.
804: * We also require the prefix (when specified) mask is valid, and thus
805: * reject a non-consecutive mask.
806: */
807: if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
808: return (EINVAL);
809: if (ifra->ifra_prefixmask.sin6_len != 0) {
810: plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
811: (u_char *)&ifra->ifra_prefixmask +
812: ifra->ifra_prefixmask.sin6_len);
813: if (plen <= 0)
814: return (EINVAL);
815: } else {
816: /*
817: * In this case, ia must not be NULL. We just use its prefix
818: * length.
819: */
820: plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
821: }
822: /*
823: * If the destination address on a p2p interface is specified,
824: * and the address is a scoped one, validate/set the scope
825: * zone identifier.
826: */
827: dst6 = ifra->ifra_dstaddr;
828: if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
829: (dst6.sin6_family == AF_INET6)) {
830: /* link-local index check: should be a separate function? */
831: if (IN6_IS_ADDR_LINKLOCAL(&dst6.sin6_addr)) {
832: if (dst6.sin6_addr.s6_addr16[1] == 0) {
833: /*
834: * interface ID is not embedded by
835: * the user
836: */
837: dst6.sin6_addr.s6_addr16[1] =
838: htons(ifp->if_index);
839: } else if (dst6.sin6_addr.s6_addr16[1] !=
840: htons(ifp->if_index)) {
841: return (EINVAL); /* ifid contradicts */
842: }
843: }
844: }
845: /*
846: * The destination address can be specified only for a p2p or a
847: * loopback interface. If specified, the corresponding prefix length
848: * must be 128.
849: */
850: if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
851: #ifdef FORCE_P2PPLEN
852: int i;
853: #endif
854:
855: if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
856: /* XXX: noisy message */
857: nd6log((LOG_INFO, "in6_update_ifa: a destination can "
858: "be specified for a p2p or a loopback IF only\n"));
859: return (EINVAL);
860: }
861: if (plen != 128) {
862: nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
863: "be 128 when dstaddr is specified\n"));
864: #ifdef FORCE_P2PPLEN
865: /*
866: * To be compatible with old configurations,
867: * such as ifconfig gif0 inet6 2001::1 2001::2
868: * prefixlen 126, we override the specified
869: * prefixmask as if the prefix length was 128.
870: */
871: ifra->ifra_prefixmask.sin6_len =
872: sizeof(struct sockaddr_in6);
873: for (i = 0; i < 4; i++)
874: ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] =
875: 0xffffffff;
876: plen = 128;
877: #else
878: return (EINVAL);
879: #endif
880: }
881: }
882: /* lifetime consistency check */
883: lt = &ifra->ifra_lifetime;
884: if (lt->ia6t_pltime > lt->ia6t_vltime)
885: return (EINVAL);
886: if (lt->ia6t_vltime == 0) {
887: /*
888: * the following log might be noisy, but this is a typical
889: * configuration mistake or a tool's bug.
890: */
891: nd6log((LOG_INFO,
892: "in6_update_ifa: valid lifetime is 0 for %s\n",
893: ip6_sprintf(&ifra->ifra_addr.sin6_addr)));
894:
895: if (ia == NULL)
896: return (0); /* there's nothing to do */
897: }
898:
899: /*
900: * If this is a new address, allocate a new ifaddr and link it
901: * into chains.
902: */
903: if (ia == NULL) {
904: hostIsNew = 1;
905: /*
906: * When in6_update_ifa() is called in a process of a received
907: * RA, it is called under an interrupt context. So, we should
908: * call malloc with M_NOWAIT.
909: */
910: ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
911: M_NOWAIT);
912: if (ia == NULL)
913: return (ENOBUFS);
914: bzero((caddr_t)ia, sizeof(*ia));
915: LIST_INIT(&ia->ia6_memberships);
916: /* Initialize the address and masks, and put time stamp */
917: ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
918: ia->ia_addr.sin6_family = AF_INET6;
919: ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
920: ia->ia6_createtime = ia->ia6_updatetime = time_second;
921: if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
922: /*
923: * XXX: some functions expect that ifa_dstaddr is not
924: * NULL for p2p interfaces.
925: */
926: ia->ia_ifa.ifa_dstaddr =
927: (struct sockaddr *)&ia->ia_dstaddr;
928: } else {
929: ia->ia_ifa.ifa_dstaddr = NULL;
930: }
931: ia->ia_ifa.ifa_netmask =
932: (struct sockaddr *)&ia->ia_prefixmask;
933:
934: ia->ia_ifp = ifp;
935: if ((oia = in6_ifaddr) != NULL) {
936: for ( ; oia->ia_next; oia = oia->ia_next)
937: continue;
938: oia->ia_next = ia;
939: } else
940: in6_ifaddr = ia;
941: TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa,
942: ifa_list);
943: }
944:
945: /* set prefix mask */
946: if (ifra->ifra_prefixmask.sin6_len) {
947: /*
948: * We prohibit changing the prefix length of an existing
949: * address, because
950: * + such an operation should be rare in IPv6, and
951: * + the operation would confuse prefix management.
952: */
953: if (ia->ia_prefixmask.sin6_len &&
954: in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
955: nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
956: " existing (%s) address should not be changed\n",
957: ip6_sprintf(&ia->ia_addr.sin6_addr)));
958: error = EINVAL;
959: goto unlink;
960: }
961: ia->ia_prefixmask = ifra->ifra_prefixmask;
962: }
963:
964: /*
965: * If a new destination address is specified, scrub the old one and
966: * install the new destination. Note that the interface must be
967: * p2p or loopback (see the check above.)
968: */
969: if (dst6.sin6_family == AF_INET6 &&
970: !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
971: int e;
972:
973: if ((ia->ia_flags & IFA_ROUTE) != 0 &&
974: (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
975: nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
976: "a route to the old destination: %s\n",
977: ip6_sprintf(&ia->ia_addr.sin6_addr)));
978: /* proceed anyway... */
979: } else
980: ia->ia_flags &= ~IFA_ROUTE;
981: ia->ia_dstaddr = dst6;
982: }
983:
984: /*
985: * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
986: * to see if the address is deprecated or invalidated, but initialize
987: * these members for applications.
988: */
989: ia->ia6_lifetime = ifra->ifra_lifetime;
990: if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
991: ia->ia6_lifetime.ia6t_expire =
992: time_second + ia->ia6_lifetime.ia6t_vltime;
993: } else
994: ia->ia6_lifetime.ia6t_expire = 0;
995: if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
996: ia->ia6_lifetime.ia6t_preferred =
997: time_second + ia->ia6_lifetime.ia6t_pltime;
998: } else
999: ia->ia6_lifetime.ia6t_preferred = 0;
1000:
1001: /* reset the interface and routing table appropriately. */
1002: if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
1003: goto unlink;
1004:
1005: /*
1006: * configure address flags.
1007: */
1008: ia->ia6_flags = ifra->ifra_flags;
1009: /*
1010: * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1011: * userland, make it deprecated.
1012: */
1013: if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1014: ia->ia6_lifetime.ia6t_pltime = 0;
1015: ia->ia6_lifetime.ia6t_preferred = time_second;
1016: }
1017: /*
1018: * Make the address tentative before joining multicast addresses,
1019: * so that corresponding MLD responses would not have a tentative
1020: * source address.
1021: */
1022: ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1023: if (hostIsNew && in6if_do_dad(ifp))
1024: ia->ia6_flags |= IN6_IFF_TENTATIVE;
1025:
1026: /*
1027: * We are done if we have simply modified an existing address.
1028: */
1029: if (!hostIsNew)
1030: return (error);
1031:
1032: /*
1033: * Beyond this point, we should call in6_purgeaddr upon an error,
1034: * not just go to unlink.
1035: */
1036:
1037: /* join necessary multiast groups */
1038: if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1039: struct sockaddr_in6 mltaddr, mltmask;
1040:
1041: /* join solicited multicast addr for new host id */
1042: struct sockaddr_in6 llsol;
1043:
1044: bzero(&llsol, sizeof(llsol));
1045: llsol.sin6_family = AF_INET6;
1046: llsol.sin6_len = sizeof(llsol);
1047: llsol.sin6_addr.s6_addr16[0] = htons(0xff02);
1048: llsol.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
1049: llsol.sin6_addr.s6_addr32[1] = 0;
1050: llsol.sin6_addr.s6_addr32[2] = htonl(1);
1051: llsol.sin6_addr.s6_addr32[3] =
1052: ifra->ifra_addr.sin6_addr.s6_addr32[3];
1053: llsol.sin6_addr.s6_addr8[12] = 0xff;
1054: imm = in6_joingroup(ifp, &llsol.sin6_addr, &error);
1055: if (!imm) {
1056: nd6log((LOG_ERR, "in6_update_ifa: "
1057: "addmulti failed for %s on %s (errno=%d)\n",
1058: ip6_sprintf(&llsol.sin6_addr),
1059: ifp->if_xname, error));
1060: goto cleanup;
1061: }
1062: LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1063:
1064: bzero(&mltmask, sizeof(mltmask));
1065: mltmask.sin6_len = sizeof(struct sockaddr_in6);
1066: mltmask.sin6_family = AF_INET6;
1067: mltmask.sin6_addr = in6mask32;
1068:
1069: /*
1070: * join link-local all-nodes address
1071: */
1072: bzero(&mltaddr, sizeof(mltaddr));
1073: mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1074: mltaddr.sin6_family = AF_INET6;
1075: mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1076: mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
1077: mltaddr.sin6_scope_id = 0;
1078:
1079: /*
1080: * XXX: do we really need this automatic routes?
1081: * We should probably reconsider this stuff. Most applications
1082: * actually do not need the routes, since they usually specify
1083: * the outgoing interface.
1084: */
1085: rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0);
1086: if (rt) {
1087: /*
1088: * 32bit came from "mltmask"
1089: */
1090: if (memcmp(&mltaddr.sin6_addr,
1091: &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1092: 32 / 8)) {
1093: RTFREE(rt);
1094: rt = NULL;
1095: }
1096: }
1097: if (!rt) {
1098: struct rt_addrinfo info;
1099:
1100: bzero(&info, sizeof(info));
1101: info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr;
1102: info.rti_info[RTAX_GATEWAY] =
1103: (struct sockaddr *)&ia->ia_addr;
1104: info.rti_info[RTAX_NETMASK] =
1105: (struct sockaddr *)&mltmask;
1106: info.rti_info[RTAX_IFA] =
1107: (struct sockaddr *)&ia->ia_addr;
1108: /* XXX: we need RTF_CLONING to fake nd6_rtrequest */
1109: info.rti_flags = RTF_UP | RTF_CLONING;
1110: error = rtrequest1(RTM_ADD, &info, NULL, 0);
1111: if (error)
1112: goto cleanup;
1113: } else {
1114: RTFREE(rt);
1115: }
1116: imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error);
1117: if (!imm) {
1118: nd6log((LOG_WARNING,
1119: "in6_update_ifa: addmulti failed for "
1120: "%s on %s (errno=%d)\n",
1121: ip6_sprintf(&mltaddr.sin6_addr),
1122: ifp->if_xname, error));
1123: goto cleanup;
1124: }
1125: LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1126:
1127: /*
1128: * join node information group address
1129: */
1130: if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) == 0) {
1131: imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error);
1132: if (!imm) {
1133: nd6log((LOG_WARNING, "in6_update_ifa: "
1134: "addmulti failed for %s on %s (errno=%d)\n",
1135: ip6_sprintf(&mltaddr.sin6_addr),
1136: ifp->if_xname, error));
1137: /* XXX not very fatal, go on... */
1138: } else {
1139: LIST_INSERT_HEAD(&ia->ia6_memberships,
1140: imm, i6mm_chain);
1141: }
1142: }
1143:
1144: /*
1145: * join interface-local all-nodes address.
1146: * (ff01::1%ifN, and ff01::%ifN/32)
1147: */
1148: bzero(&mltaddr.sin6_addr, sizeof(mltaddr.sin6_addr));
1149: mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1150: mltaddr.sin6_family = AF_INET6;
1151: mltaddr.sin6_addr = in6addr_intfacelocal_allnodes;
1152: mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
1153: mltaddr.sin6_scope_id = 0;
1154:
1155: /* XXX: again, do we really need the route? */
1156: rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0);
1157: if (rt) {
1158: /* 32bit came from "mltmask" */
1159: if (memcmp(&mltaddr.sin6_addr,
1160: &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1161: 32 / 8)) {
1162: RTFREE(rt);
1163: rt = NULL;
1164: }
1165: }
1166: if (!rt) {
1167: struct rt_addrinfo info;
1168:
1169: bzero(&info, sizeof(info));
1170: info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr;
1171: info.rti_info[RTAX_GATEWAY] =
1172: (struct sockaddr *)&ia->ia_addr;
1173: info.rti_info[RTAX_NETMASK] =
1174: (struct sockaddr *)&mltmask;
1175: info.rti_info[RTAX_IFA] =
1176: (struct sockaddr *)&ia->ia_addr;
1177: info.rti_flags = RTF_UP | RTF_CLONING;
1178: error = rtrequest1(RTM_ADD, &info, NULL, 0);
1179: if (error)
1180: goto cleanup;
1181: } else {
1182: RTFREE(rt);
1183: }
1184: imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error);
1185: if (!imm) {
1186: nd6log((LOG_WARNING, "in6_update_ifa: "
1187: "addmulti failed for %s on %s (errno=%d)\n",
1188: ip6_sprintf(&mltaddr.sin6_addr),
1189: ifp->if_xname, error));
1190: goto cleanup;
1191: }
1192: LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1193: }
1194:
1195: /*
1196: * Perform DAD, if needed.
1197: * XXX It may be of use, if we can administratively
1198: * disable DAD.
1199: */
1200: if (hostIsNew && in6if_do_dad(ifp) &&
1201: (ifra->ifra_flags & IN6_IFF_NODAD) == 0)
1202: {
1203: nd6_dad_start((struct ifaddr *)ia, NULL);
1204: }
1205:
1206: return (error);
1207:
1208: unlink:
1209: /*
1210: * XXX: if a change of an existing address failed, keep the entry
1211: * anyway.
1212: */
1213: if (hostIsNew)
1214: in6_unlink_ifa(ia, ifp);
1215: return (error);
1216:
1217: cleanup:
1218: in6_purgeaddr(&ia->ia_ifa);
1219: return error;
1220: }
1221:
1222: void
1223: in6_purgeaddr(ifa)
1224: struct ifaddr *ifa;
1225: {
1226: struct ifnet *ifp = ifa->ifa_ifp;
1227: struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1228: struct in6_multi_mship *imm;
1229:
1230: /* stop DAD processing */
1231: nd6_dad_stop(ifa);
1232:
1233: /*
1234: * delete route to the destination of the address being purged.
1235: * The interface must be p2p or loopback in this case.
1236: */
1237: if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) {
1238: int e;
1239:
1240: if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
1241: != 0) {
1242: log(LOG_ERR, "in6_purgeaddr: failed to remove "
1243: "a route to the p2p destination: %s on %s, "
1244: "errno=%d\n",
1245: ip6_sprintf(&ia->ia_addr.sin6_addr), ifp->if_xname,
1246: e);
1247: /* proceed anyway... */
1248: } else
1249: ia->ia_flags &= ~IFA_ROUTE;
1250: }
1251:
1252: /* Remove ownaddr's loopback rtentry, if it exists. */
1253: in6_ifremloop(&(ia->ia_ifa));
1254:
1255: /*
1256: * leave from multicast groups we have joined for the interface
1257: */
1258: while (!LIST_EMPTY(&ia->ia6_memberships)) {
1259: imm = LIST_FIRST(&ia->ia6_memberships);
1260: LIST_REMOVE(imm, i6mm_chain);
1261: in6_leavegroup(imm);
1262: }
1263:
1264: in6_unlink_ifa(ia, ifp);
1265: }
1266:
1267: static void
1268: in6_unlink_ifa(ia, ifp)
1269: struct in6_ifaddr *ia;
1270: struct ifnet *ifp;
1271: {
1272: struct in6_ifaddr *oia;
1273: int s = splnet();
1274:
1275: TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
1276:
1277: oia = ia;
1278: if (oia == (ia = in6_ifaddr))
1279: in6_ifaddr = ia->ia_next;
1280: else {
1281: while (ia->ia_next && (ia->ia_next != oia))
1282: ia = ia->ia_next;
1283: if (ia->ia_next)
1284: ia->ia_next = oia->ia_next;
1285: else {
1286: /* search failed */
1287: printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n");
1288: }
1289: }
1290:
1291: if (!LIST_EMPTY(&oia->ia6_multiaddrs)) {
1292: in6_savemkludge(oia);
1293: }
1294:
1295: /*
1296: * When an autoconfigured address is being removed, release the
1297: * reference to the base prefix. Also, since the release might
1298: * affect the status of other (detached) addresses, call
1299: * pfxlist_onlink_check().
1300: */
1301: if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) {
1302: if (oia->ia6_ndpr == NULL) {
1303: log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address "
1304: "%p has no prefix\n", oia);
1305: } else {
1306: oia->ia6_ndpr->ndpr_refcnt--;
1307: oia->ia6_flags &= ~IN6_IFF_AUTOCONF;
1308: oia->ia6_ndpr = NULL;
1309: }
1310:
1311: pfxlist_onlink_check();
1312: }
1313:
1314: /*
1315: * release another refcnt for the link from in6_ifaddr.
1316: * Note that we should decrement the refcnt at least once for all *BSD.
1317: */
1318: IFAFREE(&oia->ia_ifa);
1319:
1320: splx(s);
1321: }
1322:
1323: void
1324: in6_purgeif(ifp)
1325: struct ifnet *ifp;
1326: {
1327: struct ifaddr *ifa, *nifa;
1328:
1329: for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa)
1330: {
1331: nifa = TAILQ_NEXT(ifa, ifa_list);
1332: if (ifa->ifa_addr->sa_family != AF_INET6)
1333: continue;
1334: in6_purgeaddr(ifa);
1335: }
1336:
1337: in6_ifdetach(ifp);
1338: }
1339:
1340: /*
1341: * SIOC[GAD]LIFADDR.
1342: * SIOCGLIFADDR: get first address. (?)
1343: * SIOCGLIFADDR with IFLR_PREFIX:
1344: * get first address that matches the specified prefix.
1345: * SIOCALIFADDR: add the specified address.
1346: * SIOCALIFADDR with IFLR_PREFIX:
1347: * add the specified prefix, filling hostid part from
1348: * the first link-local address. prefixlen must be <= 64.
1349: * SIOCDLIFADDR: delete the specified address.
1350: * SIOCDLIFADDR with IFLR_PREFIX:
1351: * delete the first address that matches the specified prefix.
1352: * return values:
1353: * EINVAL on invalid parameters
1354: * EADDRNOTAVAIL on prefix match failed/specified address not found
1355: * other values may be returned from in6_ioctl()
1356: *
1357: * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1358: * this is to accommodate address naming scheme other than RFC2374,
1359: * in the future.
1360: * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1361: * address encoding scheme. (see figure on page 8)
1362: */
1363: static int
1364: in6_lifaddr_ioctl(so, cmd, data, ifp, p)
1365: struct socket *so;
1366: u_long cmd;
1367: caddr_t data;
1368: struct ifnet *ifp;
1369: struct proc *p;
1370: {
1371: struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1372: struct ifaddr *ifa;
1373: struct sockaddr *sa;
1374:
1375: /* sanity checks */
1376: if (!data || !ifp) {
1377: panic("invalid argument to in6_lifaddr_ioctl");
1378: /* NOTREACHED */
1379: }
1380:
1381: switch (cmd) {
1382: case SIOCGLIFADDR:
1383: /* address must be specified on GET with IFLR_PREFIX */
1384: if ((iflr->flags & IFLR_PREFIX) == 0)
1385: break;
1386: /* FALLTHROUGH */
1387: case SIOCALIFADDR:
1388: case SIOCDLIFADDR:
1389: /* address must be specified on ADD and DELETE */
1390: sa = (struct sockaddr *)&iflr->addr;
1391: if (sa->sa_family != AF_INET6)
1392: return EINVAL;
1393: if (sa->sa_len != sizeof(struct sockaddr_in6))
1394: return EINVAL;
1395: /* XXX need improvement */
1396: sa = (struct sockaddr *)&iflr->dstaddr;
1397: if (sa->sa_family && sa->sa_family != AF_INET6)
1398: return EINVAL;
1399: if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1400: return EINVAL;
1401: break;
1402: default: /* shouldn't happen */
1403: #if 0
1404: panic("invalid cmd to in6_lifaddr_ioctl");
1405: /* NOTREACHED */
1406: #else
1407: return EOPNOTSUPP;
1408: #endif
1409: }
1410: if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1411: return EINVAL;
1412:
1413: switch (cmd) {
1414: case SIOCALIFADDR:
1415: {
1416: struct in6_aliasreq ifra;
1417: struct in6_addr *hostid = NULL;
1418: int prefixlen;
1419:
1420: if ((iflr->flags & IFLR_PREFIX) != 0) {
1421: struct sockaddr_in6 *sin6;
1422:
1423: /*
1424: * hostid is to fill in the hostid part of the
1425: * address. hostid points to the first link-local
1426: * address attached to the interface.
1427: */
1428: ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1429: if (!ifa)
1430: return EADDRNOTAVAIL;
1431: hostid = IFA_IN6(ifa);
1432:
1433: /* prefixlen must be <= 64. */
1434: if (64 < iflr->prefixlen)
1435: return EINVAL;
1436: prefixlen = iflr->prefixlen;
1437:
1438: /* hostid part must be zero. */
1439: sin6 = (struct sockaddr_in6 *)&iflr->addr;
1440: if (sin6->sin6_addr.s6_addr32[2] != 0
1441: || sin6->sin6_addr.s6_addr32[3] != 0) {
1442: return EINVAL;
1443: }
1444: } else
1445: prefixlen = iflr->prefixlen;
1446:
1447: /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1448: bzero(&ifra, sizeof(ifra));
1449: bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1450:
1451: bcopy(&iflr->addr, &ifra.ifra_addr,
1452: ((struct sockaddr *)&iflr->addr)->sa_len);
1453: if (hostid) {
1454: /* fill in hostid part */
1455: ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1456: hostid->s6_addr32[2];
1457: ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1458: hostid->s6_addr32[3];
1459: }
1460:
1461: if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/
1462: bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1463: ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1464: if (hostid) {
1465: ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1466: hostid->s6_addr32[2];
1467: ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1468: hostid->s6_addr32[3];
1469: }
1470: }
1471:
1472: ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1473: in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1474:
1475: ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1476: return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, p);
1477: }
1478: case SIOCGLIFADDR:
1479: case SIOCDLIFADDR:
1480: {
1481: struct in6_ifaddr *ia;
1482: struct in6_addr mask, candidate, match;
1483: struct sockaddr_in6 *sin6;
1484: int cmp;
1485:
1486: bzero(&mask, sizeof(mask));
1487: if (iflr->flags & IFLR_PREFIX) {
1488: /* lookup a prefix rather than address. */
1489: in6_prefixlen2mask(&mask, iflr->prefixlen);
1490:
1491: sin6 = (struct sockaddr_in6 *)&iflr->addr;
1492: bcopy(&sin6->sin6_addr, &match, sizeof(match));
1493: match.s6_addr32[0] &= mask.s6_addr32[0];
1494: match.s6_addr32[1] &= mask.s6_addr32[1];
1495: match.s6_addr32[2] &= mask.s6_addr32[2];
1496: match.s6_addr32[3] &= mask.s6_addr32[3];
1497:
1498: /* if you set extra bits, that's wrong */
1499: if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1500: return EINVAL;
1501:
1502: cmp = 1;
1503: } else {
1504: if (cmd == SIOCGLIFADDR) {
1505: /* on getting an address, take the 1st match */
1506: cmp = 0; /* XXX */
1507: } else {
1508: /* on deleting an address, do exact match */
1509: in6_prefixlen2mask(&mask, 128);
1510: sin6 = (struct sockaddr_in6 *)&iflr->addr;
1511: bcopy(&sin6->sin6_addr, &match, sizeof(match));
1512:
1513: cmp = 1;
1514: }
1515: }
1516:
1517: TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1518: if (ifa->ifa_addr->sa_family != AF_INET6)
1519: continue;
1520: if (!cmp)
1521: break;
1522:
1523: bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1524: candidate.s6_addr32[0] &= mask.s6_addr32[0];
1525: candidate.s6_addr32[1] &= mask.s6_addr32[1];
1526: candidate.s6_addr32[2] &= mask.s6_addr32[2];
1527: candidate.s6_addr32[3] &= mask.s6_addr32[3];
1528: if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1529: break;
1530: }
1531: if (!ifa)
1532: return EADDRNOTAVAIL;
1533: ia = ifa2ia6(ifa);
1534:
1535: if (cmd == SIOCGLIFADDR) {
1536: /* fill in the if_laddrreq structure */
1537: bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1538: if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1539: bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1540: ia->ia_dstaddr.sin6_len);
1541: } else
1542: bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1543:
1544: iflr->prefixlen =
1545: in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1546:
1547: iflr->flags = ia->ia6_flags; /*XXX*/
1548:
1549: return 0;
1550: } else {
1551: struct in6_aliasreq ifra;
1552:
1553: /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1554: bzero(&ifra, sizeof(ifra));
1555: bcopy(iflr->iflr_name, ifra.ifra_name,
1556: sizeof(ifra.ifra_name));
1557:
1558: bcopy(&ia->ia_addr, &ifra.ifra_addr,
1559: ia->ia_addr.sin6_len);
1560: if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1561: bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1562: ia->ia_dstaddr.sin6_len);
1563: } else {
1564: bzero(&ifra.ifra_dstaddr,
1565: sizeof(ifra.ifra_dstaddr));
1566: }
1567: bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1568: ia->ia_prefixmask.sin6_len);
1569:
1570: ifra.ifra_flags = ia->ia6_flags;
1571: return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1572: ifp, p);
1573: }
1574: }
1575: }
1576:
1577: return EOPNOTSUPP; /* just for safety */
1578: }
1579:
1580: /*
1581: * Initialize an interface's intetnet6 address
1582: * and routing table entry.
1583: */
1584: static int
1585: in6_ifinit(ifp, ia, sin6, newhost)
1586: struct ifnet *ifp;
1587: struct in6_ifaddr *ia;
1588: struct sockaddr_in6 *sin6;
1589: int newhost;
1590: {
1591: int error = 0, plen, ifacount = 0;
1592: int s = splnet();
1593: struct ifaddr *ifa;
1594:
1595: /*
1596: * Give the interface a chance to initialize
1597: * if this is its first address (or it is a CARP interface)
1598: * and to validate the address if necessary.
1599: */
1600: TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1601: if (ifa->ifa_addr == NULL)
1602: continue; /* just for safety */
1603: if (ifa->ifa_addr->sa_family != AF_INET6)
1604: continue;
1605: ifacount++;
1606: }
1607:
1608: ia->ia_addr = *sin6;
1609:
1610: if ((ifacount <= 1 || ifp->if_type == IFT_CARP) && ifp->if_ioctl &&
1611: (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
1612: splx(s);
1613: return (error);
1614: }
1615: splx(s);
1616:
1617: ia->ia_ifa.ifa_metric = ifp->if_metric;
1618:
1619: /* we could do in(6)_socktrim here, but just omit it at this moment. */
1620:
1621: /*
1622: * Special case:
1623: * If the destination address is specified for a point-to-point
1624: * interface, install a route to the destination as an interface
1625: * direct route.
1626: */
1627: plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1628: if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) {
1629: if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD,
1630: RTF_UP | RTF_HOST)) != 0)
1631: return (error);
1632: ia->ia_flags |= IFA_ROUTE;
1633: }
1634:
1635: /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
1636: if (newhost) {
1637: /* set the rtrequest function to create llinfo */
1638: ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
1639: in6_ifaddloop(&(ia->ia_ifa));
1640: }
1641:
1642: if (ifp->if_flags & IFF_MULTICAST)
1643: in6_restoremkludge(ia, ifp);
1644:
1645: return (error);
1646: }
1647:
1648: /*
1649: * Multicast address kludge:
1650: * If there were any multicast addresses attached to this interface address,
1651: * either move them to another address on this interface, or save them until
1652: * such time as this interface is reconfigured for IPv6.
1653: */
1654: void
1655: in6_savemkludge(oia)
1656: struct in6_ifaddr *oia;
1657: {
1658: struct in6_ifaddr *ia;
1659: struct in6_multi *in6m, *next;
1660:
1661: IFP_TO_IA6(oia->ia_ifp, ia);
1662: if (ia) { /* there is another address */
1663: for (in6m = LIST_FIRST(&oia->ia6_multiaddrs);
1664: in6m != LIST_END(&oia->ia6_multiaddrs); in6m = next) {
1665: next = LIST_NEXT(in6m, in6m_entry);
1666: IFAFREE(&in6m->in6m_ia->ia_ifa);
1667: ia->ia_ifa.ifa_refcnt++;
1668: in6m->in6m_ia = ia;
1669: LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
1670: }
1671: } else { /* last address on this if deleted, save */
1672: struct multi6_kludge *mk;
1673:
1674: LIST_FOREACH(mk, &in6_mk, mk_entry) {
1675: if (mk->mk_ifp == oia->ia_ifp)
1676: break;
1677: }
1678: if (mk == NULL) /* this should not happen! */
1679: panic("in6_savemkludge: no kludge space");
1680:
1681: for (in6m = LIST_FIRST(&oia->ia6_multiaddrs);
1682: in6m != LIST_END(&oia->ia6_multiaddrs); in6m = next) {
1683: next = LIST_NEXT(in6m, in6m_entry);
1684: IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
1685: in6m->in6m_ia = NULL;
1686: LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry);
1687: }
1688: }
1689: }
1690:
1691: /*
1692: * Continuation of multicast address hack:
1693: * If there was a multicast group list previously saved for this interface,
1694: * then we re-attach it to the first address configured on the i/f.
1695: */
1696: void
1697: in6_restoremkludge(ia, ifp)
1698: struct in6_ifaddr *ia;
1699: struct ifnet *ifp;
1700: {
1701: struct multi6_kludge *mk;
1702:
1703: LIST_FOREACH(mk, &in6_mk, mk_entry) {
1704: if (mk->mk_ifp == ifp) {
1705: struct in6_multi *in6m, *next;
1706:
1707: for (in6m = LIST_FIRST(&mk->mk_head);
1708: in6m != LIST_END(&mk->mk_head);
1709: in6m = next) {
1710: next = LIST_NEXT(in6m, in6m_entry);
1711: in6m->in6m_ia = ia;
1712: ia->ia_ifa.ifa_refcnt++;
1713: LIST_INSERT_HEAD(&ia->ia6_multiaddrs,
1714: in6m, in6m_entry);
1715: }
1716: LIST_INIT(&mk->mk_head);
1717: break;
1718: }
1719: }
1720: }
1721:
1722: /*
1723: * Allocate space for the kludge at interface initialization time.
1724: * Formerly, we dynamically allocated the space in in6_savemkludge() with
1725: * malloc(M_WAITOK). However, it was wrong since the function could be called
1726: * under an interrupt context (software timer on address lifetime expiration).
1727: * Also, we cannot just give up allocating the strucutre, since the group
1728: * membership structure is very complex and we need to keep it anyway.
1729: * Of course, this function MUST NOT be called under an interrupt context.
1730: * Specifically, it is expected to be called only from in6_ifattach(), though
1731: * it is a global function.
1732: */
1733: void
1734: in6_createmkludge(ifp)
1735: struct ifnet *ifp;
1736: {
1737: struct multi6_kludge *mk;
1738:
1739: LIST_FOREACH(mk, &in6_mk, mk_entry) {
1740: /* If we've already had one, do not allocate. */
1741: if (mk->mk_ifp == ifp)
1742: return;
1743: }
1744:
1745: mk = malloc(sizeof(*mk), M_IPMADDR, M_WAITOK);
1746:
1747: bzero(mk, sizeof(*mk));
1748: LIST_INIT(&mk->mk_head);
1749: mk->mk_ifp = ifp;
1750: LIST_INSERT_HEAD(&in6_mk, mk, mk_entry);
1751: }
1752:
1753: void
1754: in6_purgemkludge(ifp)
1755: struct ifnet *ifp;
1756: {
1757: struct multi6_kludge *mk;
1758: struct in6_multi *in6m;
1759:
1760: LIST_FOREACH(mk, &in6_mk, mk_entry) {
1761: if (mk->mk_ifp != ifp)
1762: continue;
1763:
1764: /* leave from all multicast groups joined */
1765: while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL)
1766: in6_delmulti(in6m);
1767: LIST_REMOVE(mk, mk_entry);
1768: free(mk, M_IPMADDR);
1769: break;
1770: }
1771: }
1772:
1773: /*
1774: * Add an address to the list of IP6 multicast addresses for a
1775: * given interface.
1776: */
1777: struct in6_multi *
1778: in6_addmulti(maddr6, ifp, errorp)
1779: struct in6_addr *maddr6;
1780: struct ifnet *ifp;
1781: int *errorp;
1782: {
1783: struct in6_ifaddr *ia;
1784: struct in6_ifreq ifr;
1785: struct in6_multi *in6m;
1786: int s = splsoftnet();
1787:
1788: *errorp = 0;
1789: /*
1790: * See if address already in list.
1791: */
1792: IN6_LOOKUP_MULTI(*maddr6, ifp, in6m);
1793: if (in6m != NULL) {
1794: /*
1795: * Found it; just increment the refrence count.
1796: */
1797: in6m->in6m_refcount++;
1798: } else {
1799: /*
1800: * New address; allocate a new multicast record
1801: * and link it into the interface's multicast list.
1802: */
1803: in6m = (struct in6_multi *)
1804: malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT);
1805: if (in6m == NULL) {
1806: splx(s);
1807: *errorp = ENOBUFS;
1808: return (NULL);
1809: }
1810: in6m->in6m_addr = *maddr6;
1811: in6m->in6m_ifp = ifp;
1812: in6m->in6m_refcount = 1;
1813: IFP_TO_IA6(ifp, ia);
1814: if (ia == NULL) {
1815: free(in6m, M_IPMADDR);
1816: splx(s);
1817: *errorp = EADDRNOTAVAIL; /* appropriate? */
1818: return (NULL);
1819: }
1820: in6m->in6m_ia = ia;
1821: ia->ia_ifa.ifa_refcnt++; /* gain a reference */
1822: LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
1823:
1824: /*
1825: * Ask the network driver to update its multicast reception
1826: * filter appropriately for the new address.
1827: */
1828: bzero(&ifr.ifr_addr, sizeof(struct sockaddr_in6));
1829: ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
1830: ifr.ifr_addr.sin6_family = AF_INET6;
1831: ifr.ifr_addr.sin6_addr = *maddr6;
1832: if (ifp->if_ioctl == NULL)
1833: *errorp = ENXIO; /* XXX: appropriate? */
1834: else
1835: *errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI,
1836: (caddr_t)&ifr);
1837: if (*errorp) {
1838: LIST_REMOVE(in6m, in6m_entry);
1839: free(in6m, M_IPMADDR);
1840: IFAFREE(&ia->ia_ifa);
1841: splx(s);
1842: return (NULL);
1843: }
1844: /*
1845: * Let MLD6 know that we have joined a new IP6 multicast
1846: * group.
1847: */
1848: mld6_start_listening(in6m);
1849: }
1850: splx(s);
1851: return (in6m);
1852: }
1853:
1854: /*
1855: * Delete a multicast address record.
1856: */
1857: void
1858: in6_delmulti(in6m)
1859: struct in6_multi *in6m;
1860: {
1861: struct in6_ifreq ifr;
1862: int s = splsoftnet();
1863:
1864: if (--in6m->in6m_refcount == 0) {
1865: /*
1866: * No remaining claims to this record; let MLD6 know
1867: * that we are leaving the multicast group.
1868: */
1869: mld6_stop_listening(in6m);
1870:
1871: /*
1872: * Unlink from list.
1873: */
1874: LIST_REMOVE(in6m, in6m_entry);
1875: if (in6m->in6m_ia) {
1876: IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
1877: }
1878:
1879: /*
1880: * Notify the network driver to update its multicast
1881: * reception filter.
1882: */
1883: bzero(&ifr.ifr_addr, sizeof(struct sockaddr_in6));
1884: ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
1885: ifr.ifr_addr.sin6_family = AF_INET6;
1886: ifr.ifr_addr.sin6_addr = in6m->in6m_addr;
1887: (*in6m->in6m_ifp->if_ioctl)(in6m->in6m_ifp,
1888: SIOCDELMULTI, (caddr_t)&ifr);
1889: free(in6m, M_IPMADDR);
1890: }
1891: splx(s);
1892: }
1893:
1894: struct in6_multi_mship *
1895: in6_joingroup(ifp, addr, errorp)
1896: struct ifnet *ifp;
1897: struct in6_addr *addr;
1898: int *errorp;
1899: {
1900: struct in6_multi_mship *imm;
1901:
1902: imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT);
1903: if (!imm) {
1904: *errorp = ENOBUFS;
1905: return NULL;
1906: }
1907: imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp);
1908: if (!imm->i6mm_maddr) {
1909: /* *errorp is alrady set */
1910: free(imm, M_IPMADDR);
1911: return NULL;
1912: }
1913: return imm;
1914: }
1915:
1916: int
1917: in6_leavegroup(imm)
1918: struct in6_multi_mship *imm;
1919: {
1920:
1921: if (imm->i6mm_maddr)
1922: in6_delmulti(imm->i6mm_maddr);
1923: free(imm, M_IPMADDR);
1924: return 0;
1925: }
1926:
1927: /*
1928: * Find an IPv6 interface link-local address specific to an interface.
1929: */
1930: struct in6_ifaddr *
1931: in6ifa_ifpforlinklocal(ifp, ignoreflags)
1932: struct ifnet *ifp;
1933: int ignoreflags;
1934: {
1935: struct ifaddr *ifa;
1936:
1937: TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1938: if (ifa->ifa_addr == NULL)
1939: continue; /* just for safety */
1940: if (ifa->ifa_addr->sa_family != AF_INET6)
1941: continue;
1942: if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1943: if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1944: ignoreflags) != 0)
1945: continue;
1946: break;
1947: }
1948: }
1949:
1950: return ((struct in6_ifaddr *)ifa);
1951: }
1952:
1953:
1954: /*
1955: * find the internet address corresponding to a given interface and address.
1956: */
1957: struct in6_ifaddr *
1958: in6ifa_ifpwithaddr(ifp, addr)
1959: struct ifnet *ifp;
1960: struct in6_addr *addr;
1961: {
1962: struct ifaddr *ifa;
1963:
1964: TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1965: if (ifa->ifa_addr == NULL)
1966: continue; /* just for safety */
1967: if (ifa->ifa_addr->sa_family != AF_INET6)
1968: continue;
1969: if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
1970: break;
1971: }
1972:
1973: return ((struct in6_ifaddr *)ifa);
1974: }
1975:
1976: /*
1977: * Convert IP6 address to printable (loggable) representation.
1978: */
1979: static char digits[] = "0123456789abcdef";
1980: static int ip6round = 0;
1981: char *
1982: ip6_sprintf(addr)
1983: struct in6_addr *addr;
1984: {
1985: static char ip6buf[8][48];
1986: int i;
1987: char *cp;
1988: u_short *a = (u_short *)addr;
1989: u_char *d;
1990: int dcolon = 0;
1991:
1992: ip6round = (ip6round + 1) & 7;
1993: cp = ip6buf[ip6round];
1994:
1995: for (i = 0; i < 8; i++) {
1996: if (dcolon == 1) {
1997: if (*a == 0) {
1998: if (i == 7)
1999: *cp++ = ':';
2000: a++;
2001: continue;
2002: } else
2003: dcolon = 2;
2004: }
2005: if (*a == 0) {
2006: if (dcolon == 0 && *(a + 1) == 0) {
2007: if (i == 0)
2008: *cp++ = ':';
2009: *cp++ = ':';
2010: dcolon = 1;
2011: } else {
2012: *cp++ = '0';
2013: *cp++ = ':';
2014: }
2015: a++;
2016: continue;
2017: }
2018: d = (u_char *)a;
2019: *cp++ = digits[*d >> 4];
2020: *cp++ = digits[*d++ & 0xf];
2021: *cp++ = digits[*d >> 4];
2022: *cp++ = digits[*d & 0xf];
2023: *cp++ = ':';
2024: a++;
2025: }
2026: *--cp = 0;
2027: return (ip6buf[ip6round]);
2028: }
2029:
2030: /*
2031: * Get a scope of the address. Node-local, link-local, site-local or global.
2032: */
2033: int
2034: in6_addrscope (addr)
2035: struct in6_addr *addr;
2036: {
2037: int scope;
2038:
2039: if (addr->s6_addr8[0] == 0xfe) {
2040: scope = addr->s6_addr8[1] & 0xc0;
2041:
2042: switch (scope) {
2043: case 0x80:
2044: return IPV6_ADDR_SCOPE_LINKLOCAL;
2045: break;
2046: case 0xc0:
2047: return IPV6_ADDR_SCOPE_SITELOCAL;
2048: break;
2049: default:
2050: return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */
2051: break;
2052: }
2053: }
2054:
2055:
2056: if (addr->s6_addr8[0] == 0xff) {
2057: scope = addr->s6_addr8[1] & 0x0f;
2058:
2059: /*
2060: * due to other scope such as reserved,
2061: * return scope doesn't work.
2062: */
2063: switch (scope) {
2064: case IPV6_ADDR_SCOPE_INTFACELOCAL:
2065: return IPV6_ADDR_SCOPE_INTFACELOCAL;
2066: break;
2067: case IPV6_ADDR_SCOPE_LINKLOCAL:
2068: return IPV6_ADDR_SCOPE_LINKLOCAL;
2069: break;
2070: case IPV6_ADDR_SCOPE_SITELOCAL:
2071: return IPV6_ADDR_SCOPE_SITELOCAL;
2072: break;
2073: default:
2074: return IPV6_ADDR_SCOPE_GLOBAL;
2075: break;
2076: }
2077: }
2078:
2079: if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) {
2080: if (addr->s6_addr8[15] == 1) /* loopback */
2081: return IPV6_ADDR_SCOPE_INTFACELOCAL;
2082: if (addr->s6_addr8[15] == 0) /* unspecified */
2083: return IPV6_ADDR_SCOPE_LINKLOCAL;
2084: }
2085:
2086: return IPV6_ADDR_SCOPE_GLOBAL;
2087: }
2088:
2089: int
2090: in6_addr2scopeid(ifp, addr)
2091: struct ifnet *ifp; /* must not be NULL */
2092: struct in6_addr *addr; /* must not be NULL */
2093: {
2094: int scope = in6_addrscope(addr);
2095:
2096: switch(scope) {
2097: case IPV6_ADDR_SCOPE_INTFACELOCAL:
2098: case IPV6_ADDR_SCOPE_LINKLOCAL:
2099: /* XXX: we do not distinguish between a link and an I/F. */
2100: return (ifp->if_index);
2101:
2102: case IPV6_ADDR_SCOPE_SITELOCAL:
2103: return (0); /* XXX: invalid. */
2104:
2105: default:
2106: return (0); /* XXX: treat as global. */
2107: }
2108: }
2109:
2110: int
2111: in6_is_addr_deprecated(sa6)
2112: struct sockaddr_in6 *sa6;
2113: {
2114: struct in6_ifaddr *ia;
2115:
2116: for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
2117: if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
2118: &sa6->sin6_addr) &&
2119: (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0)
2120: return (1); /* true */
2121:
2122: /* XXX: do we still have to go thru the rest of the list? */
2123: }
2124:
2125: return (0); /* false */
2126: }
2127:
2128: /*
2129: * return length of part which dst and src are equal
2130: * hard coding...
2131: */
2132: int
2133: in6_matchlen(src, dst)
2134: struct in6_addr *src, *dst;
2135: {
2136: int match = 0;
2137: u_char *s = (u_char *)src, *d = (u_char *)dst;
2138: u_char *lim = s + 16, r;
2139:
2140: while (s < lim)
2141: if ((r = (*d++ ^ *s++)) != 0) {
2142: while (r < 128) {
2143: match++;
2144: r <<= 1;
2145: }
2146: break;
2147: } else
2148: match += 8;
2149: return match;
2150: }
2151:
2152: int
2153: in6_are_prefix_equal(p1, p2, len)
2154: struct in6_addr *p1, *p2;
2155: int len;
2156: {
2157: int bytelen, bitlen;
2158:
2159: /* sanity check */
2160: if (0 > len || len > 128) {
2161: log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
2162: len);
2163: return (0);
2164: }
2165:
2166: bytelen = len / 8;
2167: bitlen = len % 8;
2168:
2169: if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
2170: return (0);
2171: /* len == 128 is ok because bitlen == 0 then */
2172: if (bitlen != 0 &&
2173: p1->s6_addr[bytelen] >> (8 - bitlen) !=
2174: p2->s6_addr[bytelen] >> (8 - bitlen))
2175: return (0);
2176:
2177: return (1);
2178: }
2179:
2180: void
2181: in6_prefixlen2mask(maskp, len)
2182: struct in6_addr *maskp;
2183: int len;
2184: {
2185: u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2186: int bytelen, bitlen, i;
2187:
2188: /* sanity check */
2189: if (0 > len || len > 128) {
2190: log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2191: len);
2192: return;
2193: }
2194:
2195: bzero(maskp, sizeof(*maskp));
2196: bytelen = len / 8;
2197: bitlen = len % 8;
2198: for (i = 0; i < bytelen; i++)
2199: maskp->s6_addr[i] = 0xff;
2200: /* len == 128 is ok because bitlen == 0 then */
2201: if (bitlen)
2202: maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2203: }
2204:
2205: /*
2206: * return the best address out of the same scope
2207: */
2208: struct in6_ifaddr *
2209: in6_ifawithscope(oifp, dst)
2210: struct ifnet *oifp;
2211: struct in6_addr *dst;
2212: {
2213: int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0;
2214: int blen = -1;
2215: struct ifaddr *ifa;
2216: struct ifnet *ifp;
2217: struct in6_ifaddr *ifa_best = NULL;
2218:
2219: if (oifp == NULL) {
2220: printf("in6_ifawithscope: output interface is not specified\n");
2221: return (NULL);
2222: }
2223:
2224: /*
2225: * We search for all addresses on all interfaces from the beginning.
2226: * Comparing an interface with the outgoing interface will be done
2227: * only at the final stage of tiebreaking.
2228: */
2229: for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
2230: {
2231: /*
2232: * We can never take an address that breaks the scope zone
2233: * of the destination.
2234: */
2235: if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst))
2236: continue;
2237:
2238: TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2239: int tlen = -1, dscopecmp, bscopecmp, matchcmp;
2240:
2241: if (ifa->ifa_addr->sa_family != AF_INET6)
2242: continue;
2243:
2244: src_scope = in6_addrscope(IFA_IN6(ifa));
2245:
2246: #ifdef ADDRSELECT_DEBUG /* should be removed after stabilization */
2247: dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope);
2248: printf("in6_ifawithscope: dst=%s bestaddr=%s, "
2249: "newaddr=%s, scope=%x, dcmp=%d, bcmp=%d, "
2250: "matchlen=%d, flgs=%x\n",
2251: ip6_sprintf(dst),
2252: ifa_best ? ip6_sprintf(&ifa_best->ia_addr.sin6_addr) : "none",
2253: ip6_sprintf(IFA_IN6(ifa)), src_scope,
2254: dscopecmp,
2255: ifa_best ? IN6_ARE_SCOPE_CMP(src_scope, best_scope) : -1,
2256: in6_matchlen(IFA_IN6(ifa), dst),
2257: ((struct in6_ifaddr *)ifa)->ia6_flags);
2258: #endif
2259:
2260: /*
2261: * Don't use an address before completing DAD
2262: * nor a duplicated address.
2263: */
2264: if (((struct in6_ifaddr *)ifa)->ia6_flags &
2265: IN6_IFF_NOTREADY)
2266: continue;
2267:
2268: /* XXX: is there any case to allow anycasts? */
2269: if (((struct in6_ifaddr *)ifa)->ia6_flags &
2270: IN6_IFF_ANYCAST)
2271: continue;
2272:
2273: if (((struct in6_ifaddr *)ifa)->ia6_flags &
2274: IN6_IFF_DETACHED)
2275: continue;
2276:
2277: /*
2278: * If this is the first address we find,
2279: * keep it anyway.
2280: */
2281: if (ifa_best == NULL)
2282: goto replace;
2283:
2284: /*
2285: * ifa_best is never NULL beyond this line except
2286: * within the block labeled "replace".
2287: */
2288:
2289: /*
2290: * If ifa_best has a smaller scope than dst and
2291: * the current address has a larger one than
2292: * (or equal to) dst, always replace ifa_best.
2293: * Also, if the current address has a smaller scope
2294: * than dst, ignore it unless ifa_best also has a
2295: * smaller scope.
2296: */
2297: if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 &&
2298: IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0)
2299: goto replace;
2300: if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 &&
2301: IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0)
2302: continue;
2303:
2304: /*
2305: * A deprecated address SHOULD NOT be used in new
2306: * communications if an alternate (non-deprecated)
2307: * address is available and has sufficient scope.
2308: * RFC 2462, Section 5.5.4.
2309: */
2310: if (((struct in6_ifaddr *)ifa)->ia6_flags &
2311: IN6_IFF_DEPRECATED) {
2312: /*
2313: * Ignore any deprecated addresses if
2314: * specified by configuration.
2315: */
2316: if (!ip6_use_deprecated)
2317: continue;
2318:
2319: /*
2320: * If we have already found a non-deprecated
2321: * candidate, just ignore deprecated addresses.
2322: */
2323: if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED)
2324: == 0)
2325: continue;
2326: }
2327:
2328: /*
2329: * A non-deprecated address is always preferred
2330: * to a deprecated one regardless of scopes and
2331: * address matching.
2332: */
2333: if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) &&
2334: (((struct in6_ifaddr *)ifa)->ia6_flags &
2335: IN6_IFF_DEPRECATED) == 0)
2336: goto replace;
2337:
2338: /*
2339: * At this point, we have two cases:
2340: * 1. we are looking at a non-deprecated address,
2341: * and ifa_best is also non-deprecated.
2342: * 2. we are looking at a deprecated address,
2343: * and ifa_best is also deprecated.
2344: * Also, we do not have to consider a case where
2345: * the scope of if_best is larger(smaller) than dst and
2346: * the scope of the current address is smaller(larger)
2347: * than dst. Such a case has already been covered.
2348: * Tiebreaking is done according to the following
2349: * items:
2350: * - the scope comparison between the address and
2351: * dst (dscopecmp)
2352: * - the scope comparison between the address and
2353: * ifa_best (bscopecmp)
2354: * - if the address match dst longer than ifa_best
2355: * (matchcmp)
2356: * - if the address is on the outgoing I/F (outI/F)
2357: *
2358: * Roughly speaking, the selection policy is
2359: * - the most important item is scope. The same scope
2360: * is best. Then search for a larger scope.
2361: * Smaller scopes are the last resort.
2362: * - A deprecated address is chosen only when we have
2363: * no address that has an enough scope, but is
2364: * prefered to any addresses of smaller scopes.
2365: * - Longest address match against dst is considered
2366: * only for addresses that has the same scope of dst.
2367: * - If there is no other reasons to choose one,
2368: * addresses on the outgoing I/F are preferred.
2369: *
2370: * The precise decision table is as follows:
2371: * dscopecmp bscopecmp matchcmp outI/F | replace?
2372: * !equal equal N/A Yes | Yes (1)
2373: * !equal equal N/A No | No (2)
2374: * larger larger N/A N/A | No (3)
2375: * larger smaller N/A N/A | Yes (4)
2376: * smaller larger N/A N/A | Yes (5)
2377: * smaller smaller N/A N/A | No (6)
2378: * equal smaller N/A N/A | Yes (7)
2379: * equal larger (already done)
2380: * equal equal larger N/A | Yes (8)
2381: * equal equal smaller N/A | No (9)
2382: * equal equal equal Yes | Yes (a)
2383: * eaual eqaul equal No | No (b)
2384: */
2385: dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope);
2386: bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope);
2387:
2388: if (dscopecmp && bscopecmp == 0) {
2389: if (oifp == ifp) /* (1) */
2390: goto replace;
2391: continue; /* (2) */
2392: }
2393: if (dscopecmp > 0) {
2394: if (bscopecmp > 0) /* (3) */
2395: continue;
2396: goto replace; /* (4) */
2397: }
2398: if (dscopecmp < 0) {
2399: if (bscopecmp > 0) /* (5) */
2400: goto replace;
2401: continue; /* (6) */
2402: }
2403:
2404: /* now dscopecmp must be 0 */
2405: if (bscopecmp < 0)
2406: goto replace; /* (7) */
2407:
2408: /*
2409: * At last both dscopecmp and bscopecmp must be 0.
2410: * We need address matching against dst for
2411: * tiebreaking.
2412: */
2413: tlen = in6_matchlen(IFA_IN6(ifa), dst);
2414: matchcmp = tlen - blen;
2415: if (matchcmp > 0) /* (8) */
2416: goto replace;
2417: if (matchcmp < 0) /* (9) */
2418: continue;
2419: if (oifp == ifp) /* (a) */
2420: goto replace;
2421: continue; /* (b) */
2422:
2423: replace:
2424: ifa_best = (struct in6_ifaddr *)ifa;
2425: blen = tlen >= 0 ? tlen :
2426: in6_matchlen(IFA_IN6(ifa), dst);
2427: best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr);
2428: }
2429: }
2430:
2431: /* count statistics for future improvements */
2432: if (ifa_best == NULL)
2433: ip6stat.ip6s_sources_none++;
2434: else {
2435: if (oifp == ifa_best->ia_ifp)
2436: ip6stat.ip6s_sources_sameif[best_scope]++;
2437: else
2438: ip6stat.ip6s_sources_otherif[best_scope]++;
2439:
2440: if (best_scope == dst_scope)
2441: ip6stat.ip6s_sources_samescope[best_scope]++;
2442: else
2443: ip6stat.ip6s_sources_otherscope[best_scope]++;
2444:
2445: if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) != 0)
2446: ip6stat.ip6s_sources_deprecated[best_scope]++;
2447: }
2448:
2449: return (ifa_best);
2450: }
2451:
2452: /*
2453: * return the best address out of the same scope. if no address was
2454: * found, return the first valid address from designated IF.
2455: */
2456: struct in6_ifaddr *
2457: in6_ifawithifp(ifp, dst)
2458: struct ifnet *ifp;
2459: struct in6_addr *dst;
2460: {
2461: int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2462: struct ifaddr *ifa;
2463: struct in6_ifaddr *besta = 0;
2464: struct in6_ifaddr *dep[2]; /*last-resort: deprecated*/
2465:
2466: dep[0] = dep[1] = NULL;
2467:
2468: /*
2469: * We first look for addresses in the same scope.
2470: * If there is one, return it.
2471: * If two or more, return one which matches the dst longest.
2472: * If none, return one of global addresses assigned other ifs.
2473: */
2474: TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2475: if (ifa->ifa_addr->sa_family != AF_INET6)
2476: continue;
2477: if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2478: continue; /* XXX: is there any case to allow anycast? */
2479: if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2480: continue; /* don't use this interface */
2481: if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2482: continue;
2483: if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2484: if (ip6_use_deprecated)
2485: dep[0] = (struct in6_ifaddr *)ifa;
2486: continue;
2487: }
2488:
2489: if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2490: /*
2491: * call in6_matchlen() as few as possible
2492: */
2493: if (besta) {
2494: if (blen == -1)
2495: blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2496: tlen = in6_matchlen(IFA_IN6(ifa), dst);
2497: if (tlen > blen) {
2498: blen = tlen;
2499: besta = (struct in6_ifaddr *)ifa;
2500: }
2501: } else
2502: besta = (struct in6_ifaddr *)ifa;
2503: }
2504: }
2505: if (besta)
2506: return (besta);
2507:
2508: TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2509: if (ifa->ifa_addr->sa_family != AF_INET6)
2510: continue;
2511: if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2512: continue; /* XXX: is there any case to allow anycast? */
2513: if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2514: continue; /* don't use this interface */
2515: if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2516: continue;
2517: if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2518: if (ip6_use_deprecated)
2519: dep[1] = (struct in6_ifaddr *)ifa;
2520: continue;
2521: }
2522:
2523: return (struct in6_ifaddr *)ifa;
2524: }
2525:
2526: /* use the last-resort values, that are, deprecated addresses */
2527: if (dep[0])
2528: return dep[0];
2529: if (dep[1])
2530: return dep[1];
2531:
2532: return NULL;
2533: }
2534:
2535: /*
2536: * perform DAD when interface becomes IFF_UP.
2537: */
2538: void
2539: in6_if_up(ifp)
2540: struct ifnet *ifp;
2541: {
2542: struct ifaddr *ifa;
2543: struct in6_ifaddr *ia;
2544: int dad_delay; /* delay ticks before DAD output */
2545:
2546: /*
2547: * special cases, like 6to4, are handled in in6_ifattach
2548: */
2549: in6_ifattach(ifp, NULL);
2550:
2551: dad_delay = 0;
2552: TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2553: if (ifa->ifa_addr->sa_family != AF_INET6)
2554: continue;
2555: ia = (struct in6_ifaddr *)ifa;
2556: if (ia->ia6_flags & IN6_IFF_TENTATIVE)
2557: nd6_dad_start(ifa, &dad_delay);
2558: }
2559: }
2560:
2561: int
2562: in6if_do_dad(ifp)
2563: struct ifnet *ifp;
2564: {
2565: if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2566: return (0);
2567:
2568: switch (ifp->if_type) {
2569: case IFT_FAITH:
2570: /*
2571: * These interfaces do not have the IFF_LOOPBACK flag,
2572: * but loop packets back. We do not have to do DAD on such
2573: * interfaces. We should even omit it, because loop-backed
2574: * NS would confuse the DAD procedure.
2575: */
2576: return (0);
2577: default:
2578: /*
2579: * Our DAD routine requires the interface up and running.
2580: * However, some interfaces can be up before the RUNNING
2581: * status. Additionaly, users may try to assign addresses
2582: * before the interface becomes up (or running).
2583: * We simply skip DAD in such a case as a work around.
2584: * XXX: we should rather mark "tentative" on such addresses,
2585: * and do DAD after the interface becomes ready.
2586: */
2587: if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) !=
2588: (IFF_UP|IFF_RUNNING))
2589: return (0);
2590:
2591: return (1);
2592: }
2593: }
2594:
2595: /*
2596: * Calculate max IPv6 MTU through all the interfaces and store it
2597: * to in6_maxmtu.
2598: */
2599: void
2600: in6_setmaxmtu()
2601: {
2602: unsigned long maxmtu = 0;
2603: struct ifnet *ifp;
2604:
2605: for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
2606: {
2607: /* this function can be called during ifnet initialization */
2608: if (!ifp->if_afdata[AF_INET6])
2609: continue;
2610: if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2611: IN6_LINKMTU(ifp) > maxmtu)
2612: maxmtu = IN6_LINKMTU(ifp);
2613: }
2614: if (maxmtu) /* update only when maxmtu is positive */
2615: in6_maxmtu = maxmtu;
2616: }
2617:
2618: void *
2619: in6_domifattach(ifp)
2620: struct ifnet *ifp;
2621: {
2622: struct in6_ifextra *ext;
2623:
2624: ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2625: bzero(ext, sizeof(*ext));
2626:
2627: ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
2628: M_IFADDR, M_WAITOK);
2629: bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
2630:
2631: ext->icmp6_ifstat =
2632: (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
2633: M_IFADDR, M_WAITOK);
2634: bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
2635:
2636: ext->nd_ifinfo = nd6_ifattach(ifp);
2637: return ext;
2638: }
2639:
2640: void
2641: in6_domifdetach(ifp, aux)
2642: struct ifnet *ifp;
2643: void *aux;
2644: {
2645: struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2646:
2647: nd6_ifdetach(ext->nd_ifinfo);
2648: free(ext->in6_ifstat, M_IFADDR);
2649: free(ext->icmp6_ifstat, M_IFADDR);
2650: free(ext, M_IFADDR);
2651: }