Annotation of src/sys/netinet6/nd6_nbr.c, Revision 1.62
1.62 ! rpaulo 1: /* $NetBSD: nd6_nbr.c,v 1.61 2006/03/03 14:07:06 rpaulo Exp $ */
1.28 itojun 2: /* $KAME: nd6_nbr.c,v 1.61 2001/02/10 16:06:14 jinmei Exp $ */
1.3 thorpej 3:
1.2 itojun 4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
1.22 itojun 7: *
1.2 itojun 8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the project nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
1.22 itojun 19: *
1.2 itojun 20: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
1.33 lukem 32:
33: #include <sys/cdefs.h>
1.62 ! rpaulo 34: __KERNEL_RCSID(0, "$NetBSD: nd6_nbr.c,v 1.61 2006/03/03 14:07:06 rpaulo Exp $");
1.2 itojun 35:
36: #include "opt_inet.h"
1.5 thorpej 37: #include "opt_ipsec.h"
1.2 itojun 38:
39: #include <sys/param.h>
40: #include <sys/systm.h>
41: #include <sys/malloc.h>
42: #include <sys/mbuf.h>
43: #include <sys/socket.h>
44: #include <sys/sockio.h>
45: #include <sys/time.h>
46: #include <sys/kernel.h>
47: #include <sys/errno.h>
48: #include <sys/ioctl.h>
49: #include <sys/syslog.h>
50: #include <sys/queue.h>
1.21 itojun 51: #include <sys/callout.h>
1.2 itojun 52:
53: #include <net/if.h>
54: #include <net/if_types.h>
55: #include <net/if_dl.h>
56: #include <net/route.h>
57:
58: #include <netinet/in.h>
59: #include <netinet/in_var.h>
60: #include <netinet6/in6_var.h>
1.62 ! rpaulo 61: #include <netinet6/in6_ifattach.h>
1.14 itojun 62: #include <netinet/ip6.h>
1.2 itojun 63: #include <netinet6/ip6_var.h>
1.59 rpaulo 64: #include <netinet6/scope6_var.h>
1.2 itojun 65: #include <netinet6/nd6.h>
1.14 itojun 66: #include <netinet/icmp6.h>
1.2 itojun 67:
1.18 itojun 68: #ifdef IPSEC
69: #include <netinet6/ipsec.h>
70: #endif
71:
1.9 itojun 72: #include <net/net_osdep.h>
73:
1.2 itojun 74: #define SDL(s) ((struct sockaddr_dl *)s)
75:
76: struct dadq;
77: static struct dadq *nd6_dad_find __P((struct ifaddr *));
1.26 itojun 78: static void nd6_dad_starttimer __P((struct dadq *, int));
79: static void nd6_dad_stoptimer __P((struct dadq *));
1.2 itojun 80: static void nd6_dad_timer __P((struct ifaddr *));
1.9 itojun 81: static void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *));
1.2 itojun 82: static void nd6_dad_ns_input __P((struct ifaddr *));
83: static void nd6_dad_na_input __P((struct ifaddr *));
84:
1.9 itojun 85: static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/
86: static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */
1.2 itojun 87:
88: /*
1.61 rpaulo 89: * Input a Neighbor Solicitation Message.
1.2 itojun 90: *
91: * Based on RFC 2461
1.61 rpaulo 92: * Based on RFC 2462 (duplicate address detection)
1.2 itojun 93: */
94: void
95: nd6_ns_input(m, off, icmp6len)
96: struct mbuf *m;
97: int off, icmp6len;
98: {
99: struct ifnet *ifp = m->m_pkthdr.rcvif;
100: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.16 itojun 101: struct nd_neighbor_solicit *nd_ns;
1.2 itojun 102: struct in6_addr saddr6 = ip6->ip6_src;
103: struct in6_addr daddr6 = ip6->ip6_dst;
1.16 itojun 104: struct in6_addr taddr6;
1.2 itojun 105: struct in6_addr myaddr6;
106: char *lladdr = NULL;
107: struct ifaddr *ifa;
108: int lladdrlen = 0;
109: int anycast = 0, proxy = 0, tentative = 0;
1.39 itojun 110: int router = ip6_forwarding;
1.2 itojun 111: int tlladdr;
112: union nd_opts ndopts;
1.16 itojun 113: struct sockaddr_dl *proxydl = NULL;
1.2 itojun 114:
1.26 itojun 115: IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
116: if (nd_ns == NULL) {
117: icmp6stat.icp6s_tooshort++;
118: return;
119: }
120: ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
121: taddr6 = nd_ns->nd_ns_target;
1.59 rpaulo 122: if (in6_setscope(&taddr6, ifp, NULL) != 0)
123: goto bad;
1.26 itojun 124:
1.2 itojun 125: if (ip6->ip6_hlim != 255) {
1.26 itojun 126: nd6log((LOG_ERR,
127: "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
128: ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
129: ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
130: goto bad;
1.2 itojun 131: }
132:
133: if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
1.61 rpaulo 134: /* dst has to be a solicited node multicast address. */
1.39 itojun 135: /* don't check ifindex portion */
136: if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
137: daddr6.s6_addr32[1] == 0 &&
138: daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
139: daddr6.s6_addr8[12] == 0xff) {
1.31 itojun 140: ; /* good */
1.2 itojun 141: } else {
1.26 itojun 142: nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
1.39 itojun 143: "(wrong ip6 dst)\n"));
1.2 itojun 144: goto bad;
145: }
146: }
147:
148: if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
1.26 itojun 149: nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
1.2 itojun 150: goto bad;
151: }
152:
153: icmp6len -= sizeof(*nd_ns);
154: nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
155: if (nd6_options(&ndopts) < 0) {
1.26 itojun 156: nd6log((LOG_INFO,
157: "nd6_ns_input: invalid ND option, ignored\n"));
158: /* nd6_options have incremented stats */
159: goto freeit;
1.2 itojun 160: }
161:
162: if (ndopts.nd_opts_src_lladdr) {
1.31 itojun 163: lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
1.2 itojun 164: lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
165: }
1.42 itojun 166:
1.2 itojun 167: if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
1.26 itojun 168: nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
169: "(link-layer address option)\n"));
1.2 itojun 170: goto bad;
171: }
172:
173: /*
174: * Attaching target link-layer address to the NA?
175: * (RFC 2461 7.2.4)
176: *
1.62 ! rpaulo 177: * NS IP dst is multicast MUST add
! 178: * Otherwise MAY be omitted
1.2 itojun 179: *
1.62 ! rpaulo 180: * In this implementation, we omit the target link-layer address
! 181: * in the "MAY" case.
1.2 itojun 182: */
183: #if 0 /* too much! */
184: ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6);
185: if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST))
186: tlladdr = 0;
187: else
188: #endif
189: if (!IN6_IS_ADDR_MULTICAST(&daddr6))
190: tlladdr = 0;
191: else
192: tlladdr = 1;
193:
194: /*
195: * Target address (taddr6) must be either:
196: * (1) Valid unicast/anycast address for my receiving interface,
197: * (2) Unicast address for which I'm offering proxy service, or
198: * (3) "tentative" address on which DAD is being performed.
199: */
200: /* (1) and (3) check. */
201: ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
202:
203: /* (2) check. */
1.62 ! rpaulo 204: if (ifa == NULL) {
1.2 itojun 205: struct rtentry *rt;
206: struct sockaddr_in6 tsin6;
207:
1.62 ! rpaulo 208: memset(&tsin6, 0, sizeof(tsin6));
1.2 itojun 209: tsin6.sin6_len = sizeof(struct sockaddr_in6);
210: tsin6.sin6_family = AF_INET6;
211: tsin6.sin6_addr = taddr6;
212:
1.17 itojun 213: rt = rtalloc1((struct sockaddr *)&tsin6, 0);
1.16 itojun 214: if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 &&
215: rt->rt_gateway->sa_family == AF_LINK) {
1.2 itojun 216: /*
1.16 itojun 217: * proxy NDP for single entry
1.2 itojun 218: */
1.16 itojun 219: ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
220: IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
221: if (ifa) {
1.2 itojun 222: proxy = 1;
1.16 itojun 223: proxydl = SDL(rt->rt_gateway);
1.39 itojun 224: router = 0; /* XXX */
1.16 itojun 225: }
1.2 itojun 226: }
1.16 itojun 227: if (rt)
228: rtfree(rt);
1.2 itojun 229: }
1.62 ! rpaulo 230: if (ifa == NULL) {
1.2 itojun 231: /*
1.60 wiz 232: * We've got an NS packet, and we don't have that address
1.2 itojun 233: * assigned for us. We MUST silently ignore it.
234: * See RFC2461 7.2.3.
235: */
1.16 itojun 236: goto freeit;
1.2 itojun 237: }
1.9 itojun 238: myaddr6 = *IFA_IN6(ifa);
1.2 itojun 239: anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
240: tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
241: if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
1.16 itojun 242: goto freeit;
1.2 itojun 243:
244: if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
1.39 itojun 245: nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
1.2 itojun 246: "(if %d, NS packet %d)\n",
1.39 itojun 247: ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2));
1.26 itojun 248: goto bad;
1.2 itojun 249: }
250:
251: if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
1.39 itojun 252: nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
1.31 itojun 253: ip6_sprintf(&saddr6)));
1.16 itojun 254: goto freeit;
1.2 itojun 255: }
256:
257: /*
258: * We have neighbor solicitation packet, with target address equals to
259: * one of my tentative address.
260: *
261: * src addr how to process?
262: * --- ---
263: * multicast of course, invalid (rejected in ip6_input)
264: * unicast somebody is doing address resolution -> ignore
265: * unspec dup address detection
266: *
267: * The processing is defined in RFC 2462.
268: */
269: if (tentative) {
270: /*
271: * If source address is unspecified address, it is for
1.61 rpaulo 272: * duplicate address detection.
1.2 itojun 273: *
274: * If not, the packet is for addess resolution;
275: * silently ignore it.
276: */
277: if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
278: nd6_dad_ns_input(ifa);
279:
1.16 itojun 280: goto freeit;
1.2 itojun 281: }
282:
283: /*
284: * If the source address is unspecified address, entries must not
285: * be created or updated.
286: * It looks that sender is performing DAD. Output NA toward
287: * all-node multicast address, to tell the sender that I'm using
288: * the address.
289: * S bit ("solicited") must be zero.
290: */
291: if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
1.59 rpaulo 292: struct in6_addr in6_all;
293:
294: in6_all = in6addr_linklocal_allnodes;
295: if (in6_setscope(&in6_all, ifp, NULL) != 0)
296: goto bad;
297: nd6_na_output(ifp, &in6_all, &taddr6,
1.39 itojun 298: ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
1.59 rpaulo 299: (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0),
1.39 itojun 300: tlladdr, (struct sockaddr *)proxydl);
1.16 itojun 301: goto freeit;
1.2 itojun 302: }
303:
1.7 itojun 304: nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0);
1.2 itojun 305:
306: nd6_na_output(ifp, &saddr6, &taddr6,
1.39 itojun 307: ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
308: (router ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED,
309: tlladdr, (struct sockaddr *)proxydl);
1.16 itojun 310: freeit:
311: m_freem(m);
1.2 itojun 312: return;
313:
314: bad:
1.26 itojun 315: nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6)));
316: nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6)));
317: nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6)));
318: icmp6stat.icp6s_badns++;
1.16 itojun 319: m_freem(m);
1.2 itojun 320: }
321:
322: /*
1.61 rpaulo 323: * Output a Neighbor Solicitation Message. Caller specifies:
1.2 itojun 324: * - ICMP6 header source IP6 address
325: * - ND6 header target IP6 address
326: * - ND6 header source datalink address
327: *
328: * Based on RFC 2461
1.61 rpaulo 329: * Based on RFC 2462 (duplicate address detection)
1.2 itojun 330: */
331: void
332: nd6_ns_output(ifp, daddr6, taddr6, ln, dad)
333: struct ifnet *ifp;
1.32 itojun 334: const struct in6_addr *daddr6, *taddr6;
1.2 itojun 335: struct llinfo_nd6 *ln; /* for source address determination */
1.61 rpaulo 336: int dad; /* duplicate address detection */
1.2 itojun 337: {
338: struct mbuf *m;
339: struct ip6_hdr *ip6;
340: struct nd_neighbor_solicit *nd_ns;
1.59 rpaulo 341: struct in6_addr *src, src_in;
1.2 itojun 342: struct ip6_moptions im6o;
343: int icmp6len;
1.15 itojun 344: int maxlen;
1.2 itojun 345: caddr_t mac;
1.39 itojun 346: struct route_in6 ro;
347:
348: bzero(&ro, sizeof(ro));
1.42 itojun 349:
1.2 itojun 350: if (IN6_IS_ADDR_MULTICAST(taddr6))
351: return;
352:
1.15 itojun 353: /* estimate the size of message */
354: maxlen = sizeof(*ip6) + sizeof(*nd_ns);
355: maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
1.29 itojun 356: #ifdef DIAGNOSTIC
1.15 itojun 357: if (max_linkhdr + maxlen >= MCLBYTES) {
358: printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES "
359: "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
1.29 itojun 360: panic("nd6_ns_output: insufficient MCLBYTES");
361: /* NOTREACHED */
362: }
1.15 itojun 363: #endif
364:
365: MGETHDR(m, M_DONTWAIT, MT_DATA);
366: if (m && max_linkhdr + maxlen >= MHLEN) {
367: MCLGET(m, M_DONTWAIT);
368: if ((m->m_flags & M_EXT) == 0) {
369: m_free(m);
370: m = NULL;
371: }
372: }
373: if (m == NULL)
1.2 itojun 374: return;
1.31 itojun 375: m->m_pkthdr.rcvif = NULL;
1.2 itojun 376:
377: if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
378: m->m_flags |= M_MCAST;
379: im6o.im6o_multicast_ifp = ifp;
380: im6o.im6o_multicast_hlim = 255;
381: im6o.im6o_multicast_loop = 0;
382: }
383:
384: icmp6len = sizeof(*nd_ns);
385: m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
1.31 itojun 386: m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
1.2 itojun 387:
388: /* fill neighbor solicitation packet */
389: ip6 = mtod(m, struct ip6_hdr *);
390: ip6->ip6_flow = 0;
1.10 itojun 391: ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
392: ip6->ip6_vfc |= IPV6_VERSION;
1.2 itojun 393: /* ip6->ip6_plen will be set later */
394: ip6->ip6_nxt = IPPROTO_ICMPV6;
395: ip6->ip6_hlim = 255;
396: if (daddr6)
1.59 rpaulo 397: ip6->ip6_dst = *daddr6;
1.2 itojun 398: else {
1.59 rpaulo 399: ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
400: ip6->ip6_dst.s6_addr16[1] = 0;
401: ip6->ip6_dst.s6_addr32[1] = 0;
402: ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
403: ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
404: ip6->ip6_dst.s6_addr8[12] = 0xff;
405: if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
406: goto bad;
1.2 itojun 407: }
408: if (!dad) {
409: /*
410: * RFC2461 7.2.2:
411: * "If the source address of the packet prompting the
412: * solicitation is the same as one of the addresses assigned
413: * to the outgoing interface, that address SHOULD be placed
414: * in the IP Source Address of the outgoing solicitation.
415: * Otherwise, any one of the addresses assigned to the
416: * interface should be used."
417: *
418: * We use the source address for the prompting packet
1.59 rpaulo 419: * (hsrc), if:
420: * - hsrc is given from the caller (by giving "ln"), and
421: * - hsrc belongs to the outgoing interface.
1.39 itojun 422: * Otherwise, we perform the source address selection as usual.
1.2 itojun 423: */
1.31 itojun 424: struct ip6_hdr *hip6; /* hold ip6 */
1.59 rpaulo 425: struct in6_addr *hsrc = NULL;
1.2 itojun 426:
427: if (ln && ln->ln_hold) {
1.62 ! rpaulo 428: /*
! 429: * assuming every packet in ln_hold has the same IP
! 430: * header
! 431: */
1.2 itojun 432: hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
433: /* XXX pullup? */
434: if (sizeof(*hip6) < ln->ln_hold->m_len)
1.59 rpaulo 435: hsrc = &hip6->ip6_src;
1.2 itojun 436: else
1.59 rpaulo 437: hsrc = NULL;
438: }
439: if (hsrc && in6ifa_ifpwithaddr(ifp, hsrc))
440: src = hsrc;
1.2 itojun 441: else {
1.39 itojun 442: int error;
1.59 rpaulo 443: struct sockaddr_in6 dst_sa;
1.39 itojun 444:
1.59 rpaulo 445: bzero(&dst_sa, sizeof(dst_sa));
446: dst_sa.sin6_family = AF_INET6;
447: dst_sa.sin6_len = sizeof(dst_sa);
448: dst_sa.sin6_addr = ip6->ip6_dst;
449:
450: src = in6_selectsrc(&dst_sa, NULL,
451: NULL, &ro, NULL, NULL, &error);
452: if (src == NULL) {
1.39 itojun 453: nd6log((LOG_DEBUG,
454: "nd6_ns_output: source can't be "
455: "determined: dst=%s, error=%d\n",
456: ip6_sprintf(&dst_sa.sin6_addr), error));
457: goto bad;
1.2 itojun 458: }
459: }
460: } else {
461: /*
462: * Source address for DAD packet must always be IPv6
463: * unspecified address. (0::0)
1.39 itojun 464: * We actually don't have to 0-clear the address (we did it
465: * above), but we do so here explicitly to make the intention
466: * clearer.
1.2 itojun 467: */
1.59 rpaulo 468: bzero(&src_in, sizeof(src_in));
469: src = &src_in;
1.2 itojun 470: }
1.59 rpaulo 471: ip6->ip6_src = *src;
1.2 itojun 472: nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
473: nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
474: nd_ns->nd_ns_code = 0;
475: nd_ns->nd_ns_reserved = 0;
476: nd_ns->nd_ns_target = *taddr6;
1.59 rpaulo 477: in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
1.2 itojun 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);
1.8 is 494: /* 8 byte alignments... */
495: optlen = (optlen + 7) & ~7;
1.42 itojun 496:
1.2 itojun 497: m->m_pkthdr.len += optlen;
498: m->m_len += optlen;
499: icmp6len += optlen;
1.8 is 500: bzero((caddr_t)nd_opt, optlen);
1.2 itojun 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:
1.51 itojun 506: ip6->ip6_plen = htons((u_int16_t)icmp6len);
1.2 itojun 507: nd_ns->nd_ns_cksum = 0;
1.39 itojun 508: nd_ns->nd_ns_cksum =
509: in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
1.2 itojun 510:
1.59 rpaulo 511: ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL);
1.32 itojun 512: icmp6_ifstat_inc(ifp, ifs6_out_msg);
513: icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
1.2 itojun 514: icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++;
1.32 itojun 515:
1.39 itojun 516: if (ro.ro_rt) { /* we don't cache this route. */
517: RTFREE(ro.ro_rt);
518: }
1.32 itojun 519: return;
520:
521: bad:
1.39 itojun 522: if (ro.ro_rt) {
523: RTFREE(ro.ro_rt);
524: }
1.32 itojun 525: m_freem(m);
526: return;
1.2 itojun 527: }
528:
529: /*
530: * Neighbor advertisement input handling.
531: *
532: * Based on RFC 2461
1.61 rpaulo 533: * Based on RFC 2462 (duplicate address detection)
1.16 itojun 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)
1.2 itojun 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 *);
1.16 itojun 546: struct nd_neighbor_advert *nd_na;
1.2 itojun 547: #if 0
548: struct in6_addr saddr6 = ip6->ip6_src;
549: #endif
550: struct in6_addr daddr6 = ip6->ip6_dst;
1.16 itojun 551: struct in6_addr taddr6;
552: int flags;
553: int is_router;
554: int is_solicited;
555: int is_override;
1.2 itojun 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) {
1.26 itojun 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), if_name(ifp)));
569: goto bad;
1.16 itojun 570: }
571:
572: IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
573: if (nd_na == NULL) {
574: icmp6stat.icp6s_tooshort++;
1.2 itojun 575: return;
576: }
1.59 rpaulo 577:
1.16 itojun 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);
1.2 itojun 582:
1.59 rpaulo 583: taddr6 = nd_na->nd_na_target;
584: if (in6_setscope(&taddr6, ifp, NULL))
585: return; /* XXX: impossible */
1.2 itojun 586:
587: if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
1.26 itojun 588: nd6log((LOG_ERR,
1.2 itojun 589: "nd6_na_input: invalid target address %s\n",
1.26 itojun 590: ip6_sprintf(&taddr6)));
591: goto bad;
1.2 itojun 592: }
1.39 itojun 593: if (is_solicited && IN6_IS_ADDR_MULTICAST(&daddr6)) {
594: nd6log((LOG_ERR,
595: "nd6_na_input: a solicited adv is multicasted\n"));
596: goto bad;
597: }
1.2 itojun 598:
599: icmp6len -= sizeof(*nd_na);
600: nd6_option_init(nd_na + 1, icmp6len, &ndopts);
601: if (nd6_options(&ndopts) < 0) {
1.26 itojun 602: nd6log((LOG_INFO,
603: "nd6_na_input: invalid ND option, ignored\n"));
604: /* nd6_options have incremented stats */
1.16 itojun 605: goto freeit;
1.2 itojun 606: }
607:
608: if (ndopts.nd_opts_tgt_lladdr) {
609: lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
610: lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
611: }
612:
613: ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
614:
615: /*
616: * Target address matches one of my interface address.
617: *
618: * If my address is tentative, this means that there's somebody
619: * already using the same address as mine. This indicates DAD failure.
620: * This is defined in RFC 2462.
621: *
622: * Otherwise, process as defined in RFC 2461.
623: */
624: if (ifa
625: && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
626: nd6_dad_na_input(ifa);
1.16 itojun 627: goto freeit;
1.2 itojun 628: }
629:
1.31 itojun 630: /* Just for safety, maybe unnecessary. */
1.2 itojun 631: if (ifa) {
632: log(LOG_ERR,
633: "nd6_na_input: duplicate IP6 address %s\n",
634: ip6_sprintf(&taddr6));
1.16 itojun 635: goto freeit;
1.2 itojun 636: }
637:
638: if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
1.39 itojun 639: nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
640: "(if %d, NA packet %d)\n", ip6_sprintf(&taddr6),
641: ifp->if_addrlen, lladdrlen - 2));
1.26 itojun 642: goto bad;
1.2 itojun 643: }
644:
645: /*
1.39 itojun 646: * If no neighbor cache entry is found, NA SHOULD silently be
647: * discarded.
1.2 itojun 648: */
649: rt = nd6_lookup(&taddr6, 0, ifp);
650: if ((rt == NULL) ||
651: ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) ||
652: ((sdl = SDL(rt->rt_gateway)) == NULL))
1.16 itojun 653: goto freeit;
1.2 itojun 654:
655: if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
656: /*
657: * If the link-layer has address, and no lladdr option came,
658: * discard the packet.
659: */
660: if (ifp->if_addrlen && !lladdr)
1.16 itojun 661: goto freeit;
1.2 itojun 662:
663: /*
664: * Record link-layer address, and update the state.
665: */
666: sdl->sdl_alen = ifp->if_addrlen;
667: bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
668: if (is_solicited) {
669: ln->ln_state = ND6_LLINFO_REACHABLE;
1.27 itojun 670: ln->ln_byhint = 0;
1.47 itojun 671: if (!ND6_LLINFO_PERMANENT(ln)) {
672: nd6_llinfo_settimer(ln,
673: (long)ND_IFINFO(rt->rt_ifp)->reachable * hz);
674: }
1.28 itojun 675: } else {
1.2 itojun 676: ln->ln_state = ND6_LLINFO_STALE;
1.47 itojun 677: nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz);
1.31 itojun 678: }
679: if ((ln->ln_router = is_router) != 0) {
680: /*
681: * This means a router's state has changed from
682: * non-reachable to probably reachable, and might
683: * affect the status of associated prefixes..
684: */
685: pfxlist_onlink_check();
1.28 itojun 686: }
1.2 itojun 687: } else {
688: int llchange;
689:
690: /*
691: * Check if the link-layer address has changed or not.
692: */
1.62 ! rpaulo 693: if (lladdr == NULL)
1.2 itojun 694: llchange = 0;
695: else {
696: if (sdl->sdl_alen) {
697: if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen))
698: llchange = 1;
699: else
700: llchange = 0;
701: } else
702: llchange = 1;
703: }
704:
705: /*
706: * This is VERY complex. Look at it with care.
707: *
708: * override solicit lladdr llchange action
709: * (L: record lladdr)
710: *
711: * 0 0 n -- (2c)
712: * 0 0 y n (2b) L
713: * 0 0 y y (1) REACHABLE->STALE
714: * 0 1 n -- (2c) *->REACHABLE
715: * 0 1 y n (2b) L *->REACHABLE
716: * 0 1 y y (1) REACHABLE->STALE
717: * 1 0 n -- (2a)
718: * 1 0 y n (2a) L
719: * 1 0 y y (2a) L *->STALE
720: * 1 1 n -- (2a) *->REACHABLE
721: * 1 1 y n (2a) L *->REACHABLE
722: * 1 1 y y (2a) L *->REACHABLE
723: */
1.62 ! rpaulo 724: if (!is_override && lladdr != NULL && llchange) { /* (1) */
1.2 itojun 725: /*
726: * If state is REACHABLE, make it STALE.
727: * no other updates should be done.
728: */
1.28 itojun 729: if (ln->ln_state == ND6_LLINFO_REACHABLE) {
1.2 itojun 730: ln->ln_state = ND6_LLINFO_STALE;
1.47 itojun 731: nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz);
1.28 itojun 732: }
1.16 itojun 733: goto freeit;
1.2 itojun 734: } else if (is_override /* (2a) */
1.62 ! rpaulo 735: || (!is_override && lladdr != NULL && !llchange) /* (2b) */
! 736: || lladdr == NULL) { /* (2c) */
1.2 itojun 737: /*
738: * Update link-local address, if any.
739: */
1.62 ! rpaulo 740: if (lladdr != NULL) {
1.2 itojun 741: sdl->sdl_alen = ifp->if_addrlen;
742: bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
743: }
744:
745: /*
746: * If solicited, make the state REACHABLE.
747: * If not solicited and the link-layer address was
748: * changed, make it STALE.
749: */
750: if (is_solicited) {
751: ln->ln_state = ND6_LLINFO_REACHABLE;
1.27 itojun 752: ln->ln_byhint = 0;
1.47 itojun 753: if (!ND6_LLINFO_PERMANENT(ln)) {
754: nd6_llinfo_settimer(ln,
755: (long)ND_IFINFO(ifp)->reachable * hz);
1.2 itojun 756: }
757: } else {
1.28 itojun 758: if (lladdr && llchange) {
1.2 itojun 759: ln->ln_state = ND6_LLINFO_STALE;
1.47 itojun 760: nd6_llinfo_settimer(ln,
761: (long)nd6_gctimer * hz);
1.28 itojun 762: }
1.2 itojun 763: }
764: }
765:
766: if (ln->ln_router && !is_router) {
767: /*
768: * The peer dropped the router flag.
769: * Remove the sender from the Default Router List and
770: * update the Destination Cache entries.
771: */
772: struct nd_defrouter *dr;
773: struct in6_addr *in6;
774: int s;
775:
776: in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
1.29 itojun 777:
778: /*
779: * Lock to protect the default router list.
780: * XXX: this might be unnecessary, since this function
781: * is only called under the network software interrupt
1.37 itojun 782: * context. However, we keep it just for safety.
1.29 itojun 783: */
1.4 itojun 784: s = splsoftnet();
1.2 itojun 785: dr = defrouter_lookup(in6, rt->rt_ifp);
786: if (dr)
787: defrtrlist_del(dr);
1.46 itojun 788: else if (!ip6_forwarding) {
1.2 itojun 789: /*
790: * Even if the neighbor is not in the default
791: * router list, the neighbor may be used
792: * as a next hop for some destinations
793: * (e.g. redirect case). So we must
794: * call rt6_flush explicitly.
795: */
796: rt6_flush(&ip6->ip6_src, rt->rt_ifp);
797: }
798: splx(s);
799: }
800: ln->ln_router = is_router;
801: }
802: rt->rt_flags &= ~RTF_REJECT;
803: ln->ln_asked = 0;
804: if (ln->ln_hold) {
1.62 ! rpaulo 805: struct mbuf *m_hold, *m_hold_next;
! 806:
! 807: for (m_hold = ln->ln_hold; m_hold; m_hold = m_hold_next) {
! 808: struct mbuf *mpkt = NULL;
! 809:
! 810: m_hold_next = m_hold->m_nextpkt;
! 811: mpkt = m_copym(m_hold, 0, M_COPYALL, M_DONTWAIT);
! 812: if (mpkt == NULL) {
! 813: m_freem(m_hold);
! 814: break;
! 815: }
! 816: mpkt->m_nextpkt = NULL;
! 817: /*
! 818: * we assume ifp is not a loopback here, so just set
! 819: * the 2nd argument as the 1st one.
! 820: */
! 821: nd6_output(ifp, ifp, mpkt,
! 822: (struct sockaddr_in6 *)rt_key(rt), rt);
! 823: }
! 824: ln->ln_hold = NULL;
1.2 itojun 825: }
1.16 itojun 826:
827: freeit:
828: m_freem(m);
1.26 itojun 829: return;
830:
831: bad:
832: icmp6stat.icp6s_badna++;
833: m_freem(m);
1.2 itojun 834: }
835:
836: /*
837: * Neighbor advertisement output handling.
838: *
839: * Based on RFC 2461
840: *
1.16 itojun 841: * the following items are not implemented yet:
842: * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
843: * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
1.2 itojun 844: */
845: void
1.59 rpaulo 846: nd6_na_output(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0)
1.2 itojun 847: struct ifnet *ifp;
1.59 rpaulo 848: const struct in6_addr *daddr6_0, *taddr6;
1.2 itojun 849: u_long flags;
1.16 itojun 850: int tlladdr; /* 1 if include target link-layer address */
851: struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */
1.2 itojun 852: {
853: struct mbuf *m;
854: struct ip6_hdr *ip6;
855: struct nd_neighbor_advert *nd_na;
856: struct ip6_moptions im6o;
1.53 itojun 857: struct sockaddr_in6 dst_sa;
1.59 rpaulo 858: struct in6_addr *src, daddr6;
1.39 itojun 859: int icmp6len, maxlen, error;
1.2 itojun 860: caddr_t mac;
1.39 itojun 861: struct route_in6 ro;
862:
863: mac = NULL;
864: bzero(&ro, sizeof(ro));
1.15 itojun 865:
1.59 rpaulo 866: daddr6 = *daddr6_0; /* make a local copy for modification */
867:
1.15 itojun 868: /* estimate the size of message */
869: maxlen = sizeof(*ip6) + sizeof(*nd_na);
870: maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
1.29 itojun 871: #ifdef DIAGNOSTIC
1.15 itojun 872: if (max_linkhdr + maxlen >= MCLBYTES) {
873: printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES "
874: "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
1.29 itojun 875: panic("nd6_na_output: insufficient MCLBYTES");
876: /* NOTREACHED */
877: }
1.15 itojun 878: #endif
879:
880: MGETHDR(m, M_DONTWAIT, MT_DATA);
881: if (m && max_linkhdr + maxlen >= MHLEN) {
882: MCLGET(m, M_DONTWAIT);
883: if ((m->m_flags & M_EXT) == 0) {
884: m_free(m);
885: m = NULL;
886: }
887: }
888: if (m == NULL)
1.2 itojun 889: return;
1.31 itojun 890: m->m_pkthdr.rcvif = NULL;
1.2 itojun 891:
1.59 rpaulo 892: if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
1.2 itojun 893: m->m_flags |= M_MCAST;
894: im6o.im6o_multicast_ifp = ifp;
895: im6o.im6o_multicast_hlim = 255;
896: im6o.im6o_multicast_loop = 0;
897: }
898:
899: icmp6len = sizeof(*nd_na);
900: m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
1.31 itojun 901: m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
1.2 itojun 902:
903: /* fill neighbor advertisement packet */
904: ip6 = mtod(m, struct ip6_hdr *);
905: ip6->ip6_flow = 0;
1.10 itojun 906: ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
907: ip6->ip6_vfc |= IPV6_VERSION;
1.2 itojun 908: ip6->ip6_nxt = IPPROTO_ICMPV6;
909: ip6->ip6_hlim = 255;
1.59 rpaulo 910: if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
1.2 itojun 911: /* reply to DAD */
1.59 rpaulo 912: daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
913: daddr6.s6_addr16[1] = 0;
914: daddr6.s6_addr32[1] = 0;
915: daddr6.s6_addr32[2] = 0;
916: daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
917: if (in6_setscope(&daddr6, ifp, NULL))
918: goto bad;
1.39 itojun 919:
1.2 itojun 920: flags &= ~ND_NA_FLAG_SOLICITED;
1.39 itojun 921: }
1.59 rpaulo 922: ip6->ip6_dst = daddr6;
923: bzero(&dst_sa, sizeof(struct sockaddr_in6));
924: dst_sa.sin6_family = AF_INET6;
925: dst_sa.sin6_len = sizeof(struct sockaddr_in6);
926: dst_sa.sin6_addr = daddr6;
1.2 itojun 927:
928: /*
929: * Select a source whose scope is the same as that of the dest.
930: */
1.39 itojun 931: bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa));
1.59 rpaulo 932: src = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, NULL, &error);
933: if (src == NULL) {
1.39 itojun 934: nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
935: "determined: dst=%s, error=%d\n",
936: ip6_sprintf(&dst_sa.sin6_addr), error));
937: goto bad;
1.2 itojun 938: }
1.59 rpaulo 939: ip6->ip6_src = *src;
1.2 itojun 940: nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
941: nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
942: nd_na->nd_na_code = 0;
943: nd_na->nd_na_target = *taddr6;
1.59 rpaulo 944: in6_clearscope(&nd_na->nd_na_target); /* XXX */
1.2 itojun 945:
946: /*
947: * "tlladdr" indicates NS's condition for adding tlladdr or not.
948: * see nd6_ns_input() for details.
949: * Basically, if NS packet is sent to unicast/anycast addr,
950: * target lladdr option SHOULD NOT be included.
951: */
1.16 itojun 952: if (tlladdr) {
953: /*
954: * sdl0 != NULL indicates proxy NA. If we do proxy, use
955: * lladdr in sdl0. If we are not proxying (sending NA for
956: * my address) use lladdr configured for the interface.
957: */
958: if (sdl0 == NULL)
959: mac = nd6_ifptomac(ifp);
960: else if (sdl0->sa_family == AF_LINK) {
961: struct sockaddr_dl *sdl;
962: sdl = (struct sockaddr_dl *)sdl0;
963: if (sdl->sdl_alen == ifp->if_addrlen)
964: mac = LLADDR(sdl);
965: }
966: }
967: if (tlladdr && mac) {
1.2 itojun 968: int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
969: struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1.42 itojun 970:
1.8 is 971: /* roundup to 8 bytes alignment! */
972: optlen = (optlen + 7) & ~7;
973:
1.2 itojun 974: m->m_pkthdr.len += optlen;
975: m->m_len += optlen;
976: icmp6len += optlen;
1.8 is 977: bzero((caddr_t)nd_opt, optlen);
1.2 itojun 978: nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
979: nd_opt->nd_opt_len = optlen >> 3;
980: bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
981: } else
982: flags &= ~ND_NA_FLAG_OVERRIDE;
983:
1.51 itojun 984: ip6->ip6_plen = htons((u_int16_t)icmp6len);
1.2 itojun 985: nd_na->nd_na_flags_reserved = flags;
986: nd_na->nd_na_cksum = 0;
987: nd_na->nd_na_cksum =
1.39 itojun 988: in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1.2 itojun 989:
1.49 itojun 990: ip6_output(m, NULL, NULL, 0, &im6o, (struct socket *)NULL, NULL);
1.32 itojun 991:
992: icmp6_ifstat_inc(ifp, ifs6_out_msg);
993: icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1.2 itojun 994: icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++;
1.39 itojun 995:
996: if (ro.ro_rt) { /* we don't cache this route. */
997: RTFREE(ro.ro_rt);
998: }
999: return;
1000:
1001: bad:
1002: if (ro.ro_rt) {
1003: RTFREE(ro.ro_rt);
1004: }
1005: m_freem(m);
1006: return;
1.2 itojun 1007: }
1008:
1009: caddr_t
1010: nd6_ifptomac(ifp)
1011: struct ifnet *ifp;
1012: {
1013: switch (ifp->if_type) {
1.8 is 1014: case IFT_ARCNET:
1.2 itojun 1015: case IFT_ETHER:
1016: case IFT_FDDI:
1.23 onoe 1017: case IFT_IEEE1394:
1.39 itojun 1018: case IFT_PROPVIRTUAL:
1019: case IFT_L2VLAN:
1020: case IFT_IEEE80211:
1.2 itojun 1021: return LLADDR(ifp->if_sadl);
1022: default:
1023: return NULL;
1024: }
1025: }
1026:
1027: TAILQ_HEAD(dadq_head, dadq);
1028: struct dadq {
1029: TAILQ_ENTRY(dadq) dad_list;
1030: struct ifaddr *dad_ifa;
1.55 itojun 1031: int dad_count; /* max NS to send */
1.9 itojun 1032: int dad_ns_tcount; /* # of trials to send NS */
1.2 itojun 1033: int dad_ns_ocount; /* NS sent so far */
1034: int dad_ns_icount;
1035: int dad_na_icount;
1.21 itojun 1036: struct callout dad_timer_ch;
1.2 itojun 1037: };
1038:
1039: static struct dadq_head dadq;
1.26 itojun 1040: static int dad_init = 0;
1.2 itojun 1041:
1042: static struct dadq *
1043: nd6_dad_find(ifa)
1044: struct ifaddr *ifa;
1045: {
1046: struct dadq *dp;
1047:
1048: for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) {
1049: if (dp->dad_ifa == ifa)
1050: return dp;
1051: }
1052: return NULL;
1053: }
1054:
1.26 itojun 1055: static void
1056: nd6_dad_starttimer(dp, ticks)
1057: struct dadq *dp;
1058: int ticks;
1059: {
1060:
1061: callout_reset(&dp->dad_timer_ch, ticks,
1062: (void (*) __P((void *)))nd6_dad_timer, (void *)dp->dad_ifa);
1063: }
1064:
1065: static void
1066: nd6_dad_stoptimer(dp)
1067: struct dadq *dp;
1068: {
1069:
1070: callout_stop(&dp->dad_timer_ch);
1071: }
1072:
1.2 itojun 1073: /*
1.61 rpaulo 1074: * Start Duplicate Address Detection (DAD) for specified interface address.
1.2 itojun 1075: */
1076: void
1.62 ! rpaulo 1077: nd6_dad_start(ifa, delay)
1.2 itojun 1078: struct ifaddr *ifa;
1.62 ! rpaulo 1079: int delay; /* minimum delay ticks for IFF_UP event */
1.2 itojun 1080: {
1081: struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1082: struct dadq *dp;
1083:
1084: if (!dad_init) {
1085: TAILQ_INIT(&dadq);
1086: dad_init++;
1087: }
1088:
1089: /*
1090: * If we don't need DAD, don't do it.
1091: * There are several cases:
1092: * - DAD is disabled (ip6_dad_count == 0)
1093: * - the interface address is anycast
1094: */
1095: if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1.15 itojun 1096: log(LOG_DEBUG,
1097: "nd6_dad_start: called with non-tentative address "
1.2 itojun 1098: "%s(%s)\n",
1099: ip6_sprintf(&ia->ia_addr.sin6_addr),
1.9 itojun 1100: ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1.2 itojun 1101: return;
1102: }
1103: if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1104: ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1105: return;
1106: }
1107: if (!ip6_dad_count) {
1108: ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1109: return;
1110: }
1.62 ! rpaulo 1111: if (ifa->ifa_ifp == NULL)
1.2 itojun 1112: panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1113: if (!(ifa->ifa_ifp->if_flags & IFF_UP))
1114: return;
1115: if (nd6_dad_find(ifa) != NULL) {
1116: /* DAD already in progress */
1117: return;
1118: }
1119:
1120: dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT);
1121: if (dp == NULL) {
1.15 itojun 1122: log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1.2 itojun 1123: "%s(%s)\n",
1124: ip6_sprintf(&ia->ia_addr.sin6_addr),
1.9 itojun 1125: ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1.2 itojun 1126: return;
1127: }
1128: bzero(dp, sizeof(*dp));
1.21 itojun 1129: callout_init(&dp->dad_timer_ch);
1.2 itojun 1130: TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list);
1131:
1.26 itojun 1132: nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1133: ip6_sprintf(&ia->ia_addr.sin6_addr)));
1.2 itojun 1134:
1135: /*
1136: * Send NS packet for DAD, ip6_dad_count times.
1137: * Note that we must delay the first transmission, if this is the
1138: * first packet to be sent from the interface after interface
1139: * (re)initialization.
1140: */
1141: dp->dad_ifa = ifa;
1.31 itojun 1142: IFAREF(ifa); /* just for safety */
1.2 itojun 1143: dp->dad_count = ip6_dad_count;
1144: dp->dad_ns_icount = dp->dad_na_icount = 0;
1.9 itojun 1145: dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1.62 ! rpaulo 1146: if (delay == 0) {
1.9 itojun 1147: nd6_dad_ns_output(dp, ifa);
1.38 itojun 1148: nd6_dad_starttimer(dp,
1.47 itojun 1149: (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1.62 ! rpaulo 1150: } else
! 1151: nd6_dad_starttimer(dp, delay);
1.2 itojun 1152: }
1153:
1.26 itojun 1154: /*
1155: * terminate DAD unconditionally. used for address removals.
1156: */
1157: void
1158: nd6_dad_stop(ifa)
1159: struct ifaddr *ifa;
1160: {
1161: struct dadq *dp;
1162:
1163: if (!dad_init)
1164: return;
1165: dp = nd6_dad_find(ifa);
1.62 ! rpaulo 1166: if (dp == NULL) {
1.26 itojun 1167: /* DAD wasn't started yet */
1168: return;
1169: }
1170:
1171: nd6_dad_stoptimer(dp);
1172:
1173: TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1174: free(dp, M_IP6NDP);
1175: dp = NULL;
1176: IFAFREE(ifa);
1177: }
1178:
1.2 itojun 1179: static void
1180: nd6_dad_timer(ifa)
1181: struct ifaddr *ifa;
1182: {
1183: int s;
1184: struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1185: struct dadq *dp;
1186:
1.31 itojun 1187: s = splsoftnet(); /* XXX */
1.2 itojun 1188:
1189: /* Sanity check */
1190: if (ia == NULL) {
1.15 itojun 1191: log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
1.2 itojun 1192: goto done;
1193: }
1194: dp = nd6_dad_find(ifa);
1195: if (dp == NULL) {
1.15 itojun 1196: log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n");
1.2 itojun 1197: goto done;
1198: }
1199: if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1.61 rpaulo 1200: log(LOG_ERR, "nd6_dad_timer: called with duplicate address "
1.2 itojun 1201: "%s(%s)\n",
1202: ip6_sprintf(&ia->ia_addr.sin6_addr),
1.9 itojun 1203: ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1.2 itojun 1204: goto done;
1205: }
1206: if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1.15 itojun 1207: log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1.2 itojun 1208: "%s(%s)\n",
1209: ip6_sprintf(&ia->ia_addr.sin6_addr),
1.9 itojun 1210: ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1211: goto done;
1212: }
1213:
1214: /* timeouted with IFF_{RUNNING,UP} check */
1215: if (dp->dad_ns_tcount > dad_maxtry) {
1.26 itojun 1216: nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
1217: if_name(ifa->ifa_ifp)));
1.9 itojun 1218:
1219: TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1220: free(dp, M_IP6NDP);
1221: dp = NULL;
1.13 thorpej 1222: IFAFREE(ifa);
1.2 itojun 1223: goto done;
1224: }
1225:
1226: /* Need more checks? */
1.55 itojun 1227: if (dp->dad_ns_ocount < dp->dad_count) {
1.2 itojun 1228: /*
1229: * We have more NS to go. Send NS packet for DAD.
1230: */
1.9 itojun 1231: nd6_dad_ns_output(dp, ifa);
1.38 itojun 1232: nd6_dad_starttimer(dp,
1.47 itojun 1233: (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1.2 itojun 1234: } else {
1235: /*
1236: * We have transmitted sufficient number of DAD packets.
1237: * See what we've got.
1238: */
1239: int duplicate;
1240:
1241: duplicate = 0;
1242:
1243: if (dp->dad_na_icount) {
1244: /*
1245: * the check is in nd6_dad_na_input(),
1246: * but just in case
1247: */
1248: duplicate++;
1249: }
1250:
1.55 itojun 1251: if (dp->dad_ns_icount) {
1252: /* We've seen NS, means DAD has failed. */
1253: duplicate++;
1.2 itojun 1254: }
1255:
1256: if (duplicate) {
1257: /* (*dp) will be freed in nd6_dad_duplicated() */
1258: dp = NULL;
1259: nd6_dad_duplicated(ifa);
1260: } else {
1261: /*
1262: * We are done with DAD. No NA came, no NS came.
1.61 rpaulo 1263: * No duplicate address found.
1.2 itojun 1264: */
1265: ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1266:
1.26 itojun 1267: nd6log((LOG_DEBUG,
1.15 itojun 1268: "%s: DAD complete for %s - no duplicates found\n",
1269: if_name(ifa->ifa_ifp),
1.26 itojun 1270: ip6_sprintf(&ia->ia_addr.sin6_addr)));
1.6 thorpej 1271:
1.2 itojun 1272: TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1273: free(dp, M_IP6NDP);
1274: dp = NULL;
1.13 thorpej 1275: IFAFREE(ifa);
1.2 itojun 1276: }
1277: }
1278:
1279: done:
1280: splx(s);
1281: }
1282:
1283: void
1284: nd6_dad_duplicated(ifa)
1285: struct ifaddr *ifa;
1286: {
1287: struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1.62 ! rpaulo 1288: struct ifnet *ifp;
1.2 itojun 1289: struct dadq *dp;
1290:
1291: dp = nd6_dad_find(ifa);
1292: if (dp == NULL) {
1.15 itojun 1293: log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n");
1.2 itojun 1294: return;
1295: }
1296:
1.62 ! rpaulo 1297: ifp = ifa->ifa_ifp;
1.31 itojun 1298: log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1299: "NS in/out=%d/%d, NA in=%d\n",
1.62 ! rpaulo 1300: if_name(ifp), ip6_sprintf(&ia->ia_addr.sin6_addr),
1.31 itojun 1301: dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
1.2 itojun 1302:
1303: ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1304: ia->ia6_flags |= IN6_IFF_DUPLICATED;
1305:
1306: /* We are done with DAD, with duplicated address found. (failure) */
1.26 itojun 1307: nd6_dad_stoptimer(dp);
1.2 itojun 1308:
1.15 itojun 1309: log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1.62 ! rpaulo 1310: if_name(ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
1.15 itojun 1311: log(LOG_ERR, "%s: manual intervention required\n",
1.62 ! rpaulo 1312: if_name(ifp));
! 1313:
! 1314: /*
! 1315: * If the address is a link-local address formed from an interface
! 1316: * identifier based on the hardware address which is supposed to be
! 1317: * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
! 1318: * operation on the interface SHOULD be disabled.
! 1319: * [rfc2462bis-03 Section 5.4.5]
! 1320: */
! 1321: if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
! 1322: struct in6_addr in6;
! 1323:
! 1324: /*
! 1325: * To avoid over-reaction, we only apply this logic when we are
! 1326: * very sure that hardware addresses are supposed to be unique.
! 1327: */
! 1328: switch (ifp->if_type) {
! 1329: case IFT_ETHER:
! 1330: case IFT_FDDI:
! 1331: case IFT_ATM:
! 1332: case IFT_IEEE1394:
! 1333: #ifdef IFT_IEEE80211
! 1334: case IFT_IEEE80211:
! 1335: #endif
! 1336: in6 = ia->ia_addr.sin6_addr;
! 1337: if (in6_get_hw_ifid(ifp, &in6) == 0 &&
! 1338: IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
! 1339: ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
! 1340: log(LOG_ERR, "%s: possible hardware address "
! 1341: "duplication detected, disable IPv6\n",
! 1342: if_name(ifp));
! 1343: }
! 1344: break;
! 1345: }
! 1346: }
1.6 thorpej 1347:
1.2 itojun 1348: TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1349: free(dp, M_IP6NDP);
1350: dp = NULL;
1.13 thorpej 1351: IFAFREE(ifa);
1.2 itojun 1352: }
1353:
1.9 itojun 1354: static void
1355: nd6_dad_ns_output(dp, ifa)
1356: struct dadq *dp;
1357: struct ifaddr *ifa;
1358: {
1359: struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1360: struct ifnet *ifp = ifa->ifa_ifp;
1361:
1362: dp->dad_ns_tcount++;
1363: if ((ifp->if_flags & IFF_UP) == 0) {
1364: #if 0
1365: printf("%s: interface down?\n", if_name(ifp));
1366: #endif
1367: return;
1368: }
1369: if ((ifp->if_flags & IFF_RUNNING) == 0) {
1370: #if 0
1371: printf("%s: interface not running?\n", if_name(ifp));
1372: #endif
1373: return;
1374: }
1375:
1376: dp->dad_ns_ocount++;
1377: nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
1378: }
1379:
1380: static void
1.2 itojun 1381: nd6_dad_ns_input(ifa)
1382: struct ifaddr *ifa;
1383: {
1384: struct in6_ifaddr *ia;
1.32 itojun 1385: const struct in6_addr *taddr6;
1.2 itojun 1386: struct dadq *dp;
1387: int duplicate;
1388:
1.62 ! rpaulo 1389: if (ifa == NULL)
1.2 itojun 1390: panic("ifa == NULL in nd6_dad_ns_input");
1391:
1392: ia = (struct in6_ifaddr *)ifa;
1393: taddr6 = &ia->ia_addr.sin6_addr;
1394: duplicate = 0;
1395: dp = nd6_dad_find(ifa);
1396:
1397: /* Quickhack - completely ignore DAD NS packets */
1398: if (dad_ignore_ns) {
1.26 itojun 1399: nd6log((LOG_INFO,
1400: "nd6_dad_ns_input: ignoring DAD NS packet for "
1.2 itojun 1401: "address %s(%s)\n", ip6_sprintf(taddr6),
1.26 itojun 1402: if_name(ifa->ifa_ifp)));
1.2 itojun 1403: return;
1404: }
1405:
1406: /*
1407: * if I'm yet to start DAD, someone else started using this address
1408: * first. I have a duplicate and you win.
1409: */
1.62 ! rpaulo 1410: if (dp == NULL || dp->dad_ns_ocount == 0)
1.2 itojun 1411: duplicate++;
1412:
1413: /* XXX more checks for loopback situation - see nd6_dad_timer too */
1414:
1415: if (duplicate) {
1416: dp = NULL; /* will be freed in nd6_dad_duplicated() */
1417: nd6_dad_duplicated(ifa);
1418: } else {
1419: /*
1420: * not sure if I got a duplicate.
1421: * increment ns count and see what happens.
1422: */
1423: if (dp)
1424: dp->dad_ns_icount++;
1425: }
1426: }
1427:
1.9 itojun 1428: static void
1.2 itojun 1429: nd6_dad_na_input(ifa)
1430: struct ifaddr *ifa;
1431: {
1432: struct dadq *dp;
1433:
1.62 ! rpaulo 1434: if (ifa == NULL)
1.2 itojun 1435: panic("ifa == NULL in nd6_dad_na_input");
1436:
1437: dp = nd6_dad_find(ifa);
1438: if (dp)
1439: dp->dad_na_icount++;
1440:
1441: /* remove the address. */
1442: nd6_dad_duplicated(ifa);
1443: }
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