![[BACK]](/icons/back.gif){kind=icon}
Return to nd6_nbr.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / netinet6|
Return to nd6_nbr.c CVS log | Up to [local] / sys / netinet6 |
1.1 nbrk 1: /* $OpenBSD: nd6_nbr.c,v 1.45 2007/06/08 09:31:38 henning Exp $ */
2: /* $KAME: nd6_nbr.c,v 1.61 2001/02/10 16:06:14 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/param.h>
34: #include <sys/systm.h>
35: #include <sys/malloc.h>
36: #include <sys/mbuf.h>
37: #include <sys/socket.h>
38: #include <sys/sockio.h>
39: #include <sys/time.h>
40: #include <sys/kernel.h>
41: #include <sys/errno.h>
42: #include <sys/ioctl.h>
43: #include <sys/syslog.h>
44: #include <sys/queue.h>
45: #include <sys/timeout.h>
46:
47: #include <net/if.h>
48: #include <net/if_types.h>
49: #include <net/if_dl.h>
50: #include <net/route.h>
51:
52: #include <netinet/in.h>
53: #include <netinet/in_var.h>
54: #include <netinet6/in6_var.h>
55: #include <netinet/ip6.h>
56: #include <netinet6/ip6_var.h>
57: #include <netinet6/nd6.h>
58: #include <netinet/icmp6.h>
59:
60: #include <dev/rndvar.h>
61:
62: #include "carp.h"
63: #if NCARP > 0
64: #include <netinet/ip_carp.h>
65: #endif
66:
67: #define SDL(s) ((struct sockaddr_dl *)s)
68:
69: struct dadq;
70: static struct dadq *nd6_dad_find(struct ifaddr *);
71: static void nd6_dad_starttimer(struct dadq *, int);
72: static void nd6_dad_stoptimer(struct dadq *);
73: static void nd6_dad_timer(struct ifaddr *);
74: static void nd6_dad_ns_output(struct dadq *, struct ifaddr *);
75: static void nd6_dad_ns_input(struct ifaddr *);
76: static void nd6_dad_na_input(struct ifaddr *);
77:
78: static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/
79: static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */
80:
81: /*
82: * Input an Neighbor Solicitation Message.
83: *
84: * Based on RFC 2461
85: * Based on RFC 2462 (duplicated address detection)
86: */
87: void
88: nd6_ns_input(m, off, icmp6len)
89: struct mbuf *m;
90: int off, icmp6len;
91: {
92: struct ifnet *ifp = m->m_pkthdr.rcvif;
93: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
94: struct nd_neighbor_solicit *nd_ns;
95: struct in6_addr saddr6 = ip6->ip6_src;
96: struct in6_addr daddr6 = ip6->ip6_dst;
97: struct in6_addr taddr6;
98: struct in6_addr myaddr6;
99: char *lladdr = NULL;
100: struct ifaddr *ifa = NULL;
101: int lladdrlen = 0;
102: int anycast = 0, proxy = 0, tentative = 0;
103: int router = ip6_forwarding;
104: int tlladdr;
105: union nd_opts ndopts;
106: struct sockaddr_dl *proxydl = NULL;
107:
108: IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
109: if (nd_ns == NULL) {
110: icmp6stat.icp6s_tooshort++;
111: return;
112: }
113: ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
114: taddr6 = nd_ns->nd_ns_target;
115:
116: if (ip6->ip6_hlim != 255) {
117: nd6log((LOG_ERR,
118: "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
119: ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
120: ip6_sprintf(&ip6->ip6_dst), ifp->if_xname));
121: goto bad;
122: }
123:
124: if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
125: /* dst has to be solicited node multicast address. */
126: /* don't check ifindex portion */
127: if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
128: daddr6.s6_addr32[1] == 0 &&
129: daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
130: daddr6.s6_addr8[12] == 0xff) {
131: ; /*good*/
132: } else {
133: nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
134: "(wrong ip6 dst)\n"));
135: goto bad;
136: }
137: }
138:
139: if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
140: nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
141: goto bad;
142: }
143:
144: if (IN6_IS_SCOPE_EMBED(&taddr6))
145: taddr6.s6_addr16[1] = htons(ifp->if_index);
146:
147: icmp6len -= sizeof(*nd_ns);
148: nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
149: if (nd6_options(&ndopts) < 0) {
150: nd6log((LOG_INFO,
151: "nd6_ns_input: invalid ND option, ignored\n"));
152: /* nd6_options have incremented stats */
153: goto freeit;
154: }
155:
156: if (ndopts.nd_opts_src_lladdr) {
157: lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
158: lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
159: }
160:
161: if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
162: nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
163: "(link-layer address option)\n"));
164: goto bad;
165: }
166:
167: /*
168: * Attaching target link-layer address to the NA?
169: * (RFC 2461 7.2.4)
170: *
171: * NS IP dst is unicast/anycast MUST NOT add
172: * NS IP dst is solicited-node multicast MUST add
173: *
174: * In implementation, we add target link-layer address by default.
175: * We do not add one in MUST NOT cases.
176: */
177: #if 0 /* too much! */
178: ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6);
179: if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST))
180: tlladdr = 0;
181: else
182: #endif
183: if (!IN6_IS_ADDR_MULTICAST(&daddr6))
184: tlladdr = 0;
185: else
186: tlladdr = 1;
187:
188: /*
189: * Target address (taddr6) must be either:
190: * (1) Valid unicast/anycast address for my receiving interface,
191: * (2) Unicast address for which I'm offering proxy service, or
192: * (3) "tentative" address on which DAD is being performed.
193: */
194: /* (1) and (3) check. */
195: #if NCARP > 0
196: if (ifp->if_type == IFT_CARP) {
197: ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
198: if (ifa && !carp_iamatch6(ifp, ifa))
199: ifa = NULL;
200: } else {
201: ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
202: }
203: #else
204: ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
205: #endif
206:
207: /* (2) check. */
208: if (!ifa) {
209: struct rtentry *rt;
210: struct sockaddr_in6 tsin6;
211:
212: bzero(&tsin6, sizeof tsin6);
213: tsin6.sin6_len = sizeof(struct sockaddr_in6);
214: tsin6.sin6_family = AF_INET6;
215: tsin6.sin6_addr = taddr6;
216:
217: rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0);
218: if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 &&
219: rt->rt_gateway->sa_family == AF_LINK) {
220: /*
221: * proxy NDP for single entry
222: */
223: ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
224: IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
225: if (ifa) {
226: proxy = 1;
227: proxydl = SDL(rt->rt_gateway);
228: router = 0; /* XXX */
229: }
230: }
231: if (rt)
232: rtfree(rt);
233: }
234: if (!ifa) {
235: /*
236: * We've got an NS packet, and we don't have that address
237: * assigned for us. We MUST silently ignore it.
238: * See RFC2461 7.2.3.
239: */
240: goto freeit;
241: }
242: myaddr6 = *IFA_IN6(ifa);
243: anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
244: tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
245: if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
246: goto freeit;
247:
248: if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
249: nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
250: "(if %d, NS packet %d)\n",
251: ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2));
252: goto bad;
253: }
254:
255: if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
256: log(LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
257: ip6_sprintf(&saddr6));
258: goto freeit;
259: }
260:
261: /*
262: * We have neighbor solicitation packet, with target address equals to
263: * one of my tentative address.
264: *
265: * src addr how to process?
266: * --- ---
267: * multicast of course, invalid (rejected in ip6_input)
268: * unicast somebody is doing address resolution -> ignore
269: * unspec dup address detection
270: *
271: * The processing is defined in RFC 2462.
272: */
273: if (tentative) {
274: /*
275: * If source address is unspecified address, it is for
276: * duplicated address detection.
277: *
278: * If not, the packet is for address resolution;
279: * silently ignore it.
280: */
281: if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
282: nd6_dad_ns_input(ifa);
283:
284: goto freeit;
285: }
286:
287: /*
288: * If the source address is unspecified address, entries must not
289: * be created or updated.
290: * It looks that sender is performing DAD. Output NA toward
291: * all-node multicast address, to tell the sender that I'm using
292: * the address.
293: * S bit ("solicited") must be zero.
294: */
295: if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
296: saddr6 = in6addr_linklocal_allnodes;
297: saddr6.s6_addr16[1] = htons(ifp->if_index);
298: nd6_na_output(ifp, &saddr6, &taddr6,
299: ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
300: (router ? ND_NA_FLAG_ROUTER : 0),
301: tlladdr, (struct sockaddr *)proxydl);
302: goto freeit;
303: }
304:
305: nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0);
306:
307: nd6_na_output(ifp, &saddr6, &taddr6,
308: ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
309: (router ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED,
310: tlladdr, (struct sockaddr *)proxydl);
311: freeit:
312: m_freem(m);
313: return;
314:
315: bad:
316: nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6)));
317: nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6)));
318: nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6)));
319: icmp6stat.icp6s_badns++;
320: m_freem(m);
321: }
322:
323: /*
324: * Output an Neighbor Solicitation Message. Caller specifies:
325: * - ICMP6 header source IP6 address
326: * - ND6 header target IP6 address
327: * - ND6 header source datalink address
328: *
329: * Based on RFC 2461
330: * Based on RFC 2462 (duplicated address detection)
331: */
332: void
333: nd6_ns_output(ifp, daddr6, taddr6, ln, dad)
334: struct ifnet *ifp;
335: struct in6_addr *daddr6, *taddr6;
336: struct llinfo_nd6 *ln; /* for source address determination */
337: int dad; /* duplicated address detection */
338: {
339: struct mbuf *m;
340: struct ip6_hdr *ip6;
341: struct nd_neighbor_solicit *nd_ns;
342: struct sockaddr_in6 src_sa, dst_sa;
343: struct ip6_moptions im6o;
344: int icmp6len;
345: int maxlen;
346: caddr_t mac;
347: struct route_in6 ro;
348:
349: bzero(&ro, sizeof(ro));
350:
351: if (IN6_IS_ADDR_MULTICAST(taddr6))
352: return;
353:
354: /* estimate the size of message */
355: maxlen = sizeof(*ip6) + sizeof(*nd_ns);
356: maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
357: #ifdef DIAGNOSTIC
358: if (max_linkhdr + maxlen >= MCLBYTES) {
359: printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES "
360: "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
361: panic("nd6_ns_output: insufficient MCLBYTES");
362: /* NOTREACHED */
363: }
364: #endif
365:
366: MGETHDR(m, M_DONTWAIT, MT_DATA);
367: if (m && max_linkhdr + maxlen >= MHLEN) {
368: MCLGET(m, M_DONTWAIT);
369: if ((m->m_flags & M_EXT) == 0) {
370: m_free(m);
371: m = NULL;
372: }
373: }
374: if (m == NULL)
375: return;
376: m->m_pkthdr.rcvif = NULL;
377:
378: if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
379: m->m_flags |= M_MCAST;
380: im6o.im6o_multicast_ifp = ifp;
381: im6o.im6o_multicast_hlim = 255;
382: im6o.im6o_multicast_loop = 0;
383: }
384:
385: icmp6len = sizeof(*nd_ns);
386: m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
387: m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
388:
389: /* fill neighbor solicitation packet */
390: ip6 = mtod(m, struct ip6_hdr *);
391: ip6->ip6_flow = 0;
392: ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
393: ip6->ip6_vfc |= IPV6_VERSION;
394: /* ip6->ip6_plen will be set later */
395: ip6->ip6_nxt = IPPROTO_ICMPV6;
396: ip6->ip6_hlim = 255;
397: /* determine the source and destination addresses */
398: bzero(&src_sa, sizeof(src_sa));
399: bzero(&dst_sa, sizeof(dst_sa));
400: src_sa.sin6_family = dst_sa.sin6_family = AF_INET6;
401: src_sa.sin6_len = dst_sa.sin6_len = sizeof(struct sockaddr_in6);
402: if (daddr6)
403: dst_sa.sin6_addr = *daddr6;
404: else {
405: dst_sa.sin6_addr.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
406: dst_sa.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
407: dst_sa.sin6_addr.s6_addr32[1] = 0;
408: dst_sa.sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
409: dst_sa.sin6_addr.s6_addr32[3] = taddr6->s6_addr32[3];
410: dst_sa.sin6_addr.s6_addr8[12] = 0xff;
411: }
412: ip6->ip6_dst = dst_sa.sin6_addr;
413: if (!dad) {
414: /*
415: * RFC2461 7.2.2:
416: * "If the source address of the packet prompting the
417: * solicitation is the same as one of the addresses assigned
418: * to the outgoing interface, that address SHOULD be placed
419: * in the IP Source Address of the outgoing solicitation.
420: * Otherwise, any one of the addresses assigned to the
421: * interface should be used."
422: *
423: * We use the source address for the prompting packet
424: * (saddr6), if:
425: * - saddr6 is given from the caller (by giving "ln"), and
426: * - saddr6 belongs to the outgoing interface.
427: * Otherwise, we perform the source address selection as usual.
428: */
429: struct ip6_hdr *hip6; /* hold ip6 */
430: struct in6_addr *saddr6;
431:
432: if (ln && ln->ln_hold) {
433: hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
434: /* XXX pullup? */
435: if (sizeof(*hip6) < ln->ln_hold->m_len)
436: saddr6 = &hip6->ip6_src;
437: else
438: saddr6 = NULL;
439: } else
440: saddr6 = NULL;
441: if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6))
442: src_sa.sin6_addr = *saddr6;
443: else {
444: struct in6_addr *src0;
445: int error;
446:
447: bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa));
448: src0 = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL,
449: &error);
450: if (src0 == NULL) {
451: nd6log((LOG_DEBUG,
452: "nd6_ns_output: source can't be "
453: "determined: dst=%s, error=%d\n",
454: ip6_sprintf(&dst_sa.sin6_addr), error));
455: goto bad;
456: }
457: src_sa.sin6_addr = *src0;
458: }
459: } else {
460: /*
461: * Source address for DAD packet must always be IPv6
462: * unspecified address. (0::0)
463: * We actually don't have to 0-clear the address (we did it
464: * above), but we do so here explicitly to make the intention
465: * clearer.
466: */
467: bzero(&src_sa.sin6_addr, sizeof(src_sa.sin6_addr));
468: }
469: ip6->ip6_src = src_sa.sin6_addr;
470: nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
471: nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
472: nd_ns->nd_ns_code = 0;
473: nd_ns->nd_ns_reserved = 0;
474: nd_ns->nd_ns_target = *taddr6;
475:
476: if (IN6_IS_SCOPE_EMBED(&nd_ns->nd_ns_target))
477: nd_ns->nd_ns_target.s6_addr16[1] = 0;
478:
479: /*
480: * Add source link-layer address option.
481: *
482: * spec implementation
483: * --- ---
484: * DAD packet MUST NOT do not add the option
485: * there's no link layer address:
486: * impossible do not add the option
487: * there's link layer address:
488: * Multicast NS MUST add one add the option
489: * Unicast NS SHOULD add one add the option
490: */
491: if (!dad && (mac = nd6_ifptomac(ifp))) {
492: int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
493: struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
494: /* 8 byte alignments... */
495: optlen = (optlen + 7) & ~7;
496:
497: m->m_pkthdr.len += optlen;
498: m->m_len += optlen;
499: icmp6len += optlen;
500: bzero((caddr_t)nd_opt, optlen);
501: nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
502: nd_opt->nd_opt_len = optlen >> 3;
503: bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
504: }
505:
506: ip6->ip6_plen = htons((u_short)icmp6len);
507: nd_ns->nd_ns_cksum = 0;
508: nd_ns->nd_ns_cksum =
509: in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
510:
511: ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL);
512: icmp6_ifstat_inc(ifp, ifs6_out_msg);
513: icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
514: icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++;
515:
516: if (ro.ro_rt) { /* we don't cache this route. */
517: RTFREE(ro.ro_rt);
518: }
519: return;
520:
521: bad:
522: if (ro.ro_rt) {
523: RTFREE(ro.ro_rt);
524: }
525: m_freem(m);
526: return;
527: }
528:
529: /*
530: * Neighbor advertisement input handling.
531: *
532: * Based on RFC 2461
533: * Based on RFC 2462 (duplicated address detection)
534: *
535: * the following items are not implemented yet:
536: * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
537: * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
538: */
539: void
540: nd6_na_input(m, off, icmp6len)
541: struct mbuf *m;
542: int off, icmp6len;
543: {
544: struct ifnet *ifp = m->m_pkthdr.rcvif;
545: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
546: struct nd_neighbor_advert *nd_na;
547: #if 0
548: struct in6_addr saddr6 = ip6->ip6_src;
549: #endif
550: struct in6_addr daddr6 = ip6->ip6_dst;
551: struct in6_addr taddr6;
552: int flags;
553: int is_router;
554: int is_solicited;
555: int is_override;
556: char *lladdr = NULL;
557: int lladdrlen = 0;
558: struct ifaddr *ifa;
559: struct llinfo_nd6 *ln;
560: struct rtentry *rt;
561: struct sockaddr_dl *sdl;
562: union nd_opts ndopts;
563:
564: if (ip6->ip6_hlim != 255) {
565: nd6log((LOG_ERR,
566: "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
567: ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
568: ip6_sprintf(&ip6->ip6_dst), ifp->if_xname));
569: goto bad;
570: }
571:
572: IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
573: if (nd_na == NULL) {
574: icmp6stat.icp6s_tooshort++;
575: return;
576: }
577: taddr6 = nd_na->nd_na_target;
578: flags = nd_na->nd_na_flags_reserved;
579: is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
580: is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
581: is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
582:
583: if (IN6_IS_SCOPE_EMBED(&taddr6))
584: taddr6.s6_addr16[1] = htons(ifp->if_index);
585:
586: if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
587: nd6log((LOG_ERR,
588: "nd6_na_input: invalid target address %s\n",
589: ip6_sprintf(&taddr6)));
590: goto bad;
591: }
592: if (is_solicited && IN6_IS_ADDR_MULTICAST(&daddr6)) {
593: nd6log((LOG_ERR,
594: "nd6_na_input: a solicited adv is multicasted\n"));
595: goto bad;
596: }
597:
598: icmp6len -= sizeof(*nd_na);
599: nd6_option_init(nd_na + 1, icmp6len, &ndopts);
600: if (nd6_options(&ndopts) < 0) {
601: nd6log((LOG_INFO,
602: "nd6_na_input: invalid ND option, ignored\n"));
603: /* nd6_options have incremented stats */
604: goto freeit;
605: }
606:
607: if (ndopts.nd_opts_tgt_lladdr) {
608: lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
609: lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
610: }
611:
612: ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
613:
614: /*
615: * Target address matches one of my interface address.
616: *
617: * If my address is tentative, this means that there's somebody
618: * already using the same address as mine. This indicates DAD failure.
619: * This is defined in RFC 2462.
620: *
621: * Otherwise, process as defined in RFC 2461.
622: */
623: if (ifa
624: && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
625: nd6_dad_na_input(ifa);
626: goto freeit;
627: }
628:
629: /* Just for safety, maybe unnecessary. */
630: if (ifa) {
631: log(LOG_ERR,
632: "nd6_na_input: duplicate IP6 address %s\n",
633: ip6_sprintf(&taddr6));
634: goto freeit;
635: }
636:
637: if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
638: nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
639: "(if %d, NA packet %d)\n", ip6_sprintf(&taddr6),
640: ifp->if_addrlen, lladdrlen - 2));
641: goto bad;
642: }
643:
644: /*
645: * If no neighbor cache entry is found, NA SHOULD silently be
646: * discarded.
647: */
648: rt = nd6_lookup(&taddr6, 0, ifp);
649: if ((rt == NULL) ||
650: ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) ||
651: ((sdl = SDL(rt->rt_gateway)) == NULL))
652: goto freeit;
653:
654: if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
655: /*
656: * If the link-layer has address, and no lladdr option came,
657: * discard the packet.
658: */
659: if (ifp->if_addrlen && !lladdr)
660: goto freeit;
661:
662: /*
663: * Record link-layer address, and update the state.
664: */
665: sdl->sdl_alen = ifp->if_addrlen;
666: bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
667: if (is_solicited) {
668: ln->ln_state = ND6_LLINFO_REACHABLE;
669: ln->ln_byhint = 0;
670: if (!ND6_LLINFO_PERMANENT(ln)) {
671: nd6_llinfo_settimer(ln,
672: (long)ND_IFINFO(rt->rt_ifp)->reachable * hz);
673: }
674: } else {
675: ln->ln_state = ND6_LLINFO_STALE;
676: nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz);
677: }
678: if ((ln->ln_router = is_router) != 0) {
679: /*
680: * This means a router's state has changed from
681: * non-reachable to probably reachable, and might
682: * affect the status of associated prefixes..
683: */
684: pfxlist_onlink_check();
685: }
686: } else {
687: int llchange;
688:
689: /*
690: * Check if the link-layer address has changed or not.
691: */
692: if (!lladdr)
693: llchange = 0;
694: else {
695: if (sdl->sdl_alen) {
696: if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen))
697: llchange = 1;
698: else
699: llchange = 0;
700: } else
701: llchange = 1;
702: }
703:
704: /*
705: * This is VERY complex. Look at it with care.
706: *
707: * override solicit lladdr llchange action
708: * (L: record lladdr)
709: *
710: * 0 0 n -- (2c)
711: * 0 0 y n (2b) L
712: * 0 0 y y (1) REACHABLE->STALE
713: * 0 1 n -- (2c) *->REACHABLE
714: * 0 1 y n (2b) L *->REACHABLE
715: * 0 1 y y (1) REACHABLE->STALE
716: * 1 0 n -- (2a)
717: * 1 0 y n (2a) L
718: * 1 0 y y (2a) L *->STALE
719: * 1 1 n -- (2a) *->REACHABLE
720: * 1 1 y n (2a) L *->REACHABLE
721: * 1 1 y y (2a) L *->REACHABLE
722: */
723: if (!is_override && (lladdr && llchange)) { /* (1) */
724: /*
725: * If state is REACHABLE, make it STALE.
726: * no other updates should be done.
727: */
728: if (ln->ln_state == ND6_LLINFO_REACHABLE) {
729: ln->ln_state = ND6_LLINFO_STALE;
730: nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz);
731: }
732: goto freeit;
733: } else if (is_override /* (2a) */
734: || (!is_override && (lladdr && !llchange)) /* (2b) */
735: || !lladdr) { /* (2c) */
736: /*
737: * Update link-local address, if any.
738: */
739: if (lladdr) {
740: sdl->sdl_alen = ifp->if_addrlen;
741: bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
742: }
743:
744: /*
745: * If solicited, make the state REACHABLE.
746: * If not solicited and the link-layer address was
747: * changed, make it STALE.
748: */
749: if (is_solicited) {
750: ln->ln_state = ND6_LLINFO_REACHABLE;
751: ln->ln_byhint = 0;
752: if (!ND6_LLINFO_PERMANENT(ln)) {
753: nd6_llinfo_settimer(ln,
754: (long)ND_IFINFO(ifp)->reachable * hz);
755: }
756: } else {
757: if (lladdr && llchange) {
758: ln->ln_state = ND6_LLINFO_STALE;
759: nd6_llinfo_settimer(ln,
760: (long)nd6_gctimer * hz);
761: }
762: }
763: }
764:
765: if (ln->ln_router && !is_router) {
766: /*
767: * The peer dropped the router flag.
768: * Remove the sender from the Default Router List and
769: * update the Destination Cache entries.
770: */
771: struct nd_defrouter *dr;
772: struct in6_addr *in6;
773: int s;
774:
775: in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
776:
777: /*
778: * Lock to protect the default router list.
779: * XXX: this might be unnecessary, since this function
780: * is only called under the network software interrupt
781: * context. However, we keep it just for safety.
782: */
783: s = splsoftnet();
784: dr = defrouter_lookup(in6, rt->rt_ifp);
785: if (dr)
786: defrtrlist_del(dr);
787: else if (!ip6_forwarding) {
788: /*
789: * Even if the neighbor is not in the default
790: * router list, the neighbor may be used
791: * as a next hop for some destinations
792: * (e.g. redirect case). So we must
793: * call rt6_flush explicitly.
794: */
795: rt6_flush(&ip6->ip6_src, rt->rt_ifp);
796: }
797: splx(s);
798: }
799: ln->ln_router = is_router;
800: }
801: rt->rt_flags &= ~RTF_REJECT;
802: ln->ln_asked = 0;
803: if (ln->ln_hold) {
804: /*
805: * we assume ifp is not a loopback here, so just set the 2nd
806: * argument as the 1st one.
807: */
808: nd6_output(ifp, ifp, ln->ln_hold,
809: (struct sockaddr_in6 *)rt_key(rt), rt);
810: ln->ln_hold = NULL;
811: }
812:
813: freeit:
814: m_freem(m);
815: return;
816:
817: bad:
818: icmp6stat.icp6s_badna++;
819: m_freem(m);
820: }
821:
822: /*
823: * Neighbor advertisement output handling.
824: *
825: * Based on RFC 2461
826: *
827: * the following items are not implemented yet:
828: * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
829: * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
830: */
831: void
832: nd6_na_output(ifp, daddr6, taddr6, flags, tlladdr, sdl0)
833: struct ifnet *ifp;
834: struct in6_addr *daddr6, *taddr6;
835: u_long flags;
836: int tlladdr; /* 1 if include target link-layer address */
837: struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */
838: {
839: struct mbuf *m;
840: struct ip6_hdr *ip6;
841: struct nd_neighbor_advert *nd_na;
842: struct ip6_moptions im6o;
843: struct sockaddr_in6 src_sa, dst_sa;
844: struct in6_addr *src0;
845: int icmp6len, maxlen, error;
846: caddr_t mac;
847: struct route_in6 ro;
848:
849: mac = NULL;
850: bzero(&ro, sizeof(ro));
851:
852: /* estimate the size of message */
853: maxlen = sizeof(*ip6) + sizeof(*nd_na);
854: maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
855: #ifdef DIAGNOSTIC
856: if (max_linkhdr + maxlen >= MCLBYTES) {
857: printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES "
858: "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
859: panic("nd6_na_output: insufficient MCLBYTES");
860: /* NOTREACHED */
861: }
862: #endif
863:
864: MGETHDR(m, M_DONTWAIT, MT_DATA);
865: if (m && max_linkhdr + maxlen >= MHLEN) {
866: MCLGET(m, M_DONTWAIT);
867: if ((m->m_flags & M_EXT) == 0) {
868: m_free(m);
869: m = NULL;
870: }
871: }
872: if (m == NULL)
873: return;
874: m->m_pkthdr.rcvif = NULL;
875:
876: if (IN6_IS_ADDR_MULTICAST(daddr6)) {
877: m->m_flags |= M_MCAST;
878: im6o.im6o_multicast_ifp = ifp;
879: im6o.im6o_multicast_hlim = 255;
880: im6o.im6o_multicast_loop = 0;
881: }
882:
883: icmp6len = sizeof(*nd_na);
884: m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
885: m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
886:
887: /* fill neighbor advertisement packet */
888: ip6 = mtod(m, struct ip6_hdr *);
889: ip6->ip6_flow = 0;
890: ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
891: ip6->ip6_vfc |= IPV6_VERSION;
892: ip6->ip6_nxt = IPPROTO_ICMPV6;
893: ip6->ip6_hlim = 255;
894: bzero(&src_sa, sizeof(src_sa));
895: bzero(&dst_sa, sizeof(dst_sa));
896: src_sa.sin6_len = dst_sa.sin6_len = sizeof(struct sockaddr_in6);
897: src_sa.sin6_family = dst_sa.sin6_family = AF_INET6;
898: dst_sa.sin6_addr = *daddr6;
899: if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) {
900: /* reply to DAD */
901: dst_sa.sin6_addr.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
902: dst_sa.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
903: dst_sa.sin6_addr.s6_addr32[1] = 0;
904: dst_sa.sin6_addr.s6_addr32[2] = 0;
905: dst_sa.sin6_addr.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
906:
907: flags &= ~ND_NA_FLAG_SOLICITED;
908: }
909: ip6->ip6_dst = dst_sa.sin6_addr;
910:
911: /*
912: * Select a source whose scope is the same as that of the dest.
913: */
914: bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa));
915: src0 = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, &error);
916: if (src0 == NULL) {
917: nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
918: "determined: dst=%s, error=%d\n",
919: ip6_sprintf(&dst_sa.sin6_addr), error));
920: goto bad;
921: }
922: src_sa.sin6_addr = *src0;
923: ip6->ip6_src = src_sa.sin6_addr;
924: nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
925: nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
926: nd_na->nd_na_code = 0;
927: nd_na->nd_na_target = *taddr6;
928: if (IN6_IS_SCOPE_EMBED(&nd_na->nd_na_target))
929: nd_na->nd_na_target.s6_addr16[1] = 0;
930:
931: /*
932: * "tlladdr" indicates NS's condition for adding tlladdr or not.
933: * see nd6_ns_input() for details.
934: * Basically, if NS packet is sent to unicast/anycast addr,
935: * target lladdr option SHOULD NOT be included.
936: */
937: if (tlladdr) {
938: /*
939: * sdl0 != NULL indicates proxy NA. If we do proxy, use
940: * lladdr in sdl0. If we are not proxying (sending NA for
941: * my address) use lladdr configured for the interface.
942: */
943: if (sdl0 == NULL) {
944: mac = nd6_ifptomac(ifp);
945: } else if (sdl0->sa_family == AF_LINK) {
946: struct sockaddr_dl *sdl;
947: sdl = (struct sockaddr_dl *)sdl0;
948: if (sdl->sdl_alen == ifp->if_addrlen)
949: mac = LLADDR(sdl);
950: }
951: }
952: if (tlladdr && mac) {
953: int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
954: struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
955:
956: /* roundup to 8 bytes alignment! */
957: optlen = (optlen + 7) & ~7;
958:
959: m->m_pkthdr.len += optlen;
960: m->m_len += optlen;
961: icmp6len += optlen;
962: bzero((caddr_t)nd_opt, optlen);
963: nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
964: nd_opt->nd_opt_len = optlen >> 3;
965: bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
966: } else
967: flags &= ~ND_NA_FLAG_OVERRIDE;
968:
969: ip6->ip6_plen = htons((u_short)icmp6len);
970: nd_na->nd_na_flags_reserved = flags;
971: nd_na->nd_na_cksum = 0;
972: nd_na->nd_na_cksum =
973: in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
974:
975: ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL);
976:
977: icmp6_ifstat_inc(ifp, ifs6_out_msg);
978: icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
979: icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++;
980:
981: if (ro.ro_rt) { /* we don't cache this route. */
982: RTFREE(ro.ro_rt);
983: }
984: return;
985:
986: bad:
987: if (ro.ro_rt) {
988: RTFREE(ro.ro_rt);
989: }
990: m_freem(m);
991: return;
992: }
993:
994: caddr_t
995: nd6_ifptomac(ifp)
996: struct ifnet *ifp;
997: {
998: switch (ifp->if_type) {
999: case IFT_ETHER:
1000: case IFT_FDDI:
1001: case IFT_IEEE1394:
1002: case IFT_PROPVIRTUAL:
1003: case IFT_CARP:
1004: case IFT_L2VLAN:
1005: case IFT_IEEE80211:
1006: return ((caddr_t)(ifp + 1));
1007: default:
1008: return NULL;
1009: }
1010: }
1011:
1012: TAILQ_HEAD(dadq_head, dadq);
1013: struct dadq {
1014: TAILQ_ENTRY(dadq) dad_list;
1015: struct ifaddr *dad_ifa;
1016: int dad_count; /* max NS to send */
1017: int dad_ns_tcount; /* # of trials to send NS */
1018: int dad_ns_ocount; /* NS sent so far */
1019: int dad_ns_icount;
1020: int dad_na_icount;
1021: struct timeout dad_timer_ch;
1022: };
1023:
1024: static struct dadq_head dadq;
1025: static int dad_init = 0;
1026:
1027: static struct dadq *
1028: nd6_dad_find(ifa)
1029: struct ifaddr *ifa;
1030: {
1031: struct dadq *dp;
1032:
1033: TAILQ_FOREACH(dp, &dadq, dad_list) {
1034: if (dp->dad_ifa == ifa)
1035: return dp;
1036: }
1037: return NULL;
1038: }
1039:
1040: static void
1041: nd6_dad_starttimer(dp, ticks)
1042: struct dadq *dp;
1043: int ticks;
1044: {
1045:
1046: timeout_set(&dp->dad_timer_ch, (void (*)(void *))nd6_dad_timer,
1047: (void *)dp->dad_ifa);
1048: timeout_add(&dp->dad_timer_ch, ticks);
1049: }
1050:
1051: static void
1052: nd6_dad_stoptimer(dp)
1053: struct dadq *dp;
1054: {
1055:
1056: timeout_del(&dp->dad_timer_ch);
1057: }
1058:
1059: /*
1060: * Start Duplicated Address Detection (DAD) for specified interface address.
1061: */
1062: void
1063: nd6_dad_start(ifa, tick)
1064: struct ifaddr *ifa;
1065: int *tick; /* minimum delay ticks for IFF_UP event */
1066: {
1067: struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1068: struct dadq *dp;
1069:
1070: if (!dad_init) {
1071: TAILQ_INIT(&dadq);
1072: dad_init++;
1073: }
1074:
1075: /*
1076: * If we don't need DAD, don't do it.
1077: * There are several cases:
1078: * - DAD is disabled (ip6_dad_count == 0)
1079: * - the interface address is anycast
1080: */
1081: if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1082: log(LOG_DEBUG,
1083: "nd6_dad_start: called with non-tentative address "
1084: "%s(%s)\n",
1085: ip6_sprintf(&ia->ia_addr.sin6_addr),
1086: ifa->ifa_ifp ? ifa->ifa_ifp->if_xname : "???");
1087: return;
1088: }
1089: if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1090: ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1091: return;
1092: }
1093: if (!ip6_dad_count) {
1094: ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1095: return;
1096: }
1097: if (!ifa->ifa_ifp)
1098: panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1099: if (!(ifa->ifa_ifp->if_flags & IFF_UP))
1100: return;
1101: if (nd6_dad_find(ifa) != NULL) {
1102: /* DAD already in progress */
1103: return;
1104: }
1105:
1106: dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT);
1107: if (dp == NULL) {
1108: log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1109: "%s(%s)\n",
1110: ip6_sprintf(&ia->ia_addr.sin6_addr),
1111: ifa->ifa_ifp ? ifa->ifa_ifp->if_xname : "???");
1112: return;
1113: }
1114: bzero(dp, sizeof(*dp));
1115: bzero(&dp->dad_timer_ch, sizeof(dp->dad_timer_ch));
1116: TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list);
1117:
1118: nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", ifa->ifa_ifp->if_xname,
1119: ip6_sprintf(&ia->ia_addr.sin6_addr)));
1120:
1121: /*
1122: * Send NS packet for DAD, ip6_dad_count times.
1123: * Note that we must delay the first transmission, if this is the
1124: * first packet to be sent from the interface after interface
1125: * (re)initialization.
1126: */
1127: dp->dad_ifa = ifa;
1128: ifa->ifa_refcnt++; /* just for safety */
1129: dp->dad_count = ip6_dad_count;
1130: dp->dad_ns_icount = dp->dad_na_icount = 0;
1131: dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1132: if (tick == NULL) {
1133: nd6_dad_ns_output(dp, ifa);
1134: nd6_dad_starttimer(dp,
1135: (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1136: } else {
1137: int ntick;
1138:
1139: if (*tick == 0)
1140: ntick = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
1141: else
1142: ntick = *tick + arc4random() % (hz / 2);
1143: *tick = ntick;
1144: nd6_dad_starttimer(dp, ntick);
1145: }
1146: }
1147:
1148: /*
1149: * terminate DAD unconditionally. used for address removals.
1150: */
1151: void
1152: nd6_dad_stop(ifa)
1153: struct ifaddr *ifa;
1154: {
1155: struct dadq *dp;
1156:
1157: if (!dad_init)
1158: return;
1159: dp = nd6_dad_find(ifa);
1160: if (!dp) {
1161: /* DAD wasn't started yet */
1162: return;
1163: }
1164:
1165: nd6_dad_stoptimer(dp);
1166:
1167: TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1168: free(dp, M_IP6NDP);
1169: dp = NULL;
1170: IFAFREE(ifa);
1171: }
1172:
1173: static void
1174: nd6_dad_timer(ifa)
1175: struct ifaddr *ifa;
1176: {
1177: int s;
1178: struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1179: struct dadq *dp;
1180:
1181: s = splsoftnet(); /* XXX */
1182:
1183: /* Sanity check */
1184: if (ia == NULL) {
1185: log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
1186: goto done;
1187: }
1188: dp = nd6_dad_find(ifa);
1189: if (dp == NULL) {
1190: log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n");
1191: goto done;
1192: }
1193: if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1194: log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1195: "%s(%s)\n",
1196: ip6_sprintf(&ia->ia_addr.sin6_addr),
1197: ifa->ifa_ifp ? ifa->ifa_ifp->if_xname : "???");
1198: goto done;
1199: }
1200: if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1201: log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1202: "%s(%s)\n",
1203: ip6_sprintf(&ia->ia_addr.sin6_addr),
1204: ifa->ifa_ifp ? ifa->ifa_ifp->if_xname : "???");
1205: goto done;
1206: }
1207:
1208: /* timeouted with IFF_{RUNNING,UP} check */
1209: if (dp->dad_ns_tcount > dad_maxtry) {
1210: nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
1211: ifa->ifa_ifp->if_xname));
1212:
1213: TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1214: free(dp, M_IP6NDP);
1215: dp = NULL;
1216: IFAFREE(ifa);
1217: goto done;
1218: }
1219:
1220: /* Need more checks? */
1221: if (dp->dad_ns_ocount < dp->dad_count) {
1222: /*
1223: * We have more NS to go. Send NS packet for DAD.
1224: */
1225: nd6_dad_ns_output(dp, ifa);
1226: nd6_dad_starttimer(dp,
1227: (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1228: } else {
1229: /*
1230: * We have transmitted sufficient number of DAD packets.
1231: * See what we've got.
1232: */
1233: int duplicate;
1234:
1235: duplicate = 0;
1236:
1237: if (dp->dad_na_icount) {
1238: /*
1239: * the check is in nd6_dad_na_input(),
1240: * but just in case
1241: */
1242: duplicate++;
1243: }
1244:
1245: if (dp->dad_ns_icount) {
1246: /* We've seen NS, means DAD has failed. */
1247: duplicate++;
1248: }
1249:
1250: if (duplicate) {
1251: /* (*dp) will be freed in nd6_dad_duplicated() */
1252: dp = NULL;
1253: nd6_dad_duplicated(ifa);
1254: } else {
1255: /*
1256: * We are done with DAD. No NA came, no NS came.
1257: * duplicated address found.
1258: */
1259: ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1260:
1261: nd6log((LOG_DEBUG,
1262: "%s: DAD complete for %s - no duplicates found\n",
1263: ifa->ifa_ifp->if_xname,
1264: ip6_sprintf(&ia->ia_addr.sin6_addr)));
1265:
1266: TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1267: free(dp, M_IP6NDP);
1268: dp = NULL;
1269: IFAFREE(ifa);
1270: }
1271: }
1272:
1273: done:
1274: splx(s);
1275: }
1276:
1277: void
1278: nd6_dad_duplicated(ifa)
1279: struct ifaddr *ifa;
1280: {
1281: struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1282: struct dadq *dp;
1283:
1284: dp = nd6_dad_find(ifa);
1285: if (dp == NULL) {
1286: log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n");
1287: return;
1288: }
1289:
1290: log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1291: "NS in/out=%d/%d, NA in=%d\n",
1292: ifa->ifa_ifp->if_xname, ip6_sprintf(&ia->ia_addr.sin6_addr),
1293: dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
1294:
1295: ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1296: ia->ia6_flags |= IN6_IFF_DUPLICATED;
1297:
1298: /* We are done with DAD, with duplicated address found. (failure) */
1299: nd6_dad_stoptimer(dp);
1300:
1301: log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1302: ifa->ifa_ifp->if_xname, ip6_sprintf(&ia->ia_addr.sin6_addr));
1303: log(LOG_ERR, "%s: manual intervention required\n",
1304: ifa->ifa_ifp->if_xname);
1305:
1306: TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1307: free(dp, M_IP6NDP);
1308: dp = NULL;
1309: IFAFREE(ifa);
1310: }
1311:
1312: static void
1313: nd6_dad_ns_output(dp, ifa)
1314: struct dadq *dp;
1315: struct ifaddr *ifa;
1316: {
1317: struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1318: struct ifnet *ifp = ifa->ifa_ifp;
1319:
1320: dp->dad_ns_tcount++;
1321: if ((ifp->if_flags & IFF_UP) == 0) {
1322: #if 0
1323: printf("%s: interface down?\n", ifp->if_xname);
1324: #endif
1325: return;
1326: }
1327: if ((ifp->if_flags & IFF_RUNNING) == 0) {
1328: #if 0
1329: printf("%s: interface not running?\n", ifp->if_xname);
1330: #endif
1331: return;
1332: }
1333:
1334: dp->dad_ns_ocount++;
1335: nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
1336: }
1337:
1338: static void
1339: nd6_dad_ns_input(ifa)
1340: struct ifaddr *ifa;
1341: {
1342: struct in6_ifaddr *ia;
1343: struct ifnet *ifp;
1344: struct in6_addr *taddr6;
1345: struct dadq *dp;
1346: int duplicate;
1347:
1348: if (!ifa)
1349: panic("ifa == NULL in nd6_dad_ns_input");
1350:
1351: ia = (struct in6_ifaddr *)ifa;
1352: ifp = ifa->ifa_ifp;
1353: taddr6 = &ia->ia_addr.sin6_addr;
1354: duplicate = 0;
1355: dp = nd6_dad_find(ifa);
1356:
1357: /* Quickhack - completely ignore DAD NS packets */
1358: if (dad_ignore_ns) {
1359: nd6log((LOG_INFO,
1360: "nd6_dad_ns_input: ignoring DAD NS packet for "
1361: "address %s(%s)\n", ip6_sprintf(taddr6),
1362: ifa->ifa_ifp->if_xname));
1363: return;
1364: }
1365:
1366: /*
1367: * if I'm yet to start DAD, someone else started using this address
1368: * first. I have a duplicate and you win.
1369: */
1370: if (!dp || dp->dad_ns_ocount == 0)
1371: duplicate++;
1372:
1373: /* XXX more checks for loopback situation - see nd6_dad_timer too */
1374:
1375: if (duplicate) {
1376: dp = NULL; /* will be freed in nd6_dad_duplicated() */
1377: nd6_dad_duplicated(ifa);
1378: } else {
1379: /*
1380: * not sure if I got a duplicate.
1381: * increment ns count and see what happens.
1382: */
1383: if (dp)
1384: dp->dad_ns_icount++;
1385: }
1386: }
1387:
1388: static void
1389: nd6_dad_na_input(ifa)
1390: struct ifaddr *ifa;
1391: {
1392: struct dadq *dp;
1393:
1394: if (!ifa)
1395: panic("ifa == NULL in nd6_dad_na_input");
1396:
1397: dp = nd6_dad_find(ifa);
1398: if (dp)
1399: dp->dad_na_icount++;
1400:
1401: /* remove the address. */
1402: nd6_dad_duplicated(ifa);
1403: }