Annotation of src/sys/netinet6/nd6_nbr.c, Revision 1.166
1.166 ! roy 1: /* $NetBSD: nd6_nbr.c,v 1.165 2019/04/29 11:57:22 roy 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>
1.166 ! roy 34: __KERNEL_RCSID(0, "$NetBSD: nd6_nbr.c,v 1.165 2019/04/29 11:57:22 roy Exp $");
1.2 itojun 35:
1.110 pooka 36: #ifdef _KERNEL_OPT
1.2 itojun 37: #include "opt_inet.h"
1.128 ozaki-r 38: #include "opt_net_mpsafe.h"
1.110 pooka 39: #endif
1.2 itojun 40:
41: #include <sys/param.h>
42: #include <sys/systm.h>
1.137 ozaki-r 43: #include <sys/kmem.h>
1.2 itojun 44: #include <sys/mbuf.h>
45: #include <sys/socket.h>
1.86 ad 46: #include <sys/socketvar.h>
1.2 itojun 47: #include <sys/sockio.h>
48: #include <sys/time.h>
49: #include <sys/kernel.h>
50: #include <sys/errno.h>
51: #include <sys/ioctl.h>
52: #include <sys/syslog.h>
53: #include <sys/queue.h>
1.21 itojun 54: #include <sys/callout.h>
1.149 roy 55: #include <sys/cprng.h>
1.2 itojun 56:
57: #include <net/if.h>
58: #include <net/if_types.h>
59: #include <net/if_dl.h>
60: #include <net/route.h>
61:
62: #include <netinet/in.h>
63: #include <netinet/in_var.h>
64: #include <netinet6/in6_var.h>
1.62 rpaulo 65: #include <netinet6/in6_ifattach.h>
1.14 itojun 66: #include <netinet/ip6.h>
1.2 itojun 67: #include <netinet6/ip6_var.h>
1.59 rpaulo 68: #include <netinet6/scope6_var.h>
1.2 itojun 69: #include <netinet6/nd6.h>
1.14 itojun 70: #include <netinet/icmp6.h>
1.85 thorpej 71: #include <netinet6/icmp6_private.h>
1.2 itojun 72:
1.64 liamjfoy 73: #include "carp.h"
74: #if NCARP > 0
75: #include <netinet/ip_carp.h>
76: #endif
77:
1.2 itojun 78: struct dadq;
1.158 roy 79: static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *, bool *);
1.162 roy 80: static bool nd6_dad_ownnonce(struct ifaddr *, struct nd_opt_nonce *nonce);
1.72 dyoung 81: static void nd6_dad_starttimer(struct dadq *, int);
1.144 ozaki-r 82: static void nd6_dad_destroytimer(struct dadq *);
83: static void nd6_dad_timer(struct dadq *);
1.72 dyoung 84: static void nd6_dad_ns_output(struct dadq *, struct ifaddr *);
1.166 ! roy 85: static void nd6_dad_input(struct ifaddr *, struct nd_opt_nonce *,
! 86: const struct sockaddr_dl *);
! 87: static void nd6_dad_duplicated(struct ifaddr *, struct dadq *,
! 88: const struct sockaddr_dl *);
1.2 itojun 89:
1.9 itojun 90: static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */
1.2 itojun 91:
92: /*
1.61 rpaulo 93: * Input a Neighbor Solicitation Message.
1.2 itojun 94: *
95: * Based on RFC 2461
1.61 rpaulo 96: * Based on RFC 2462 (duplicate address detection)
1.2 itojun 97: */
98: void
1.72 dyoung 99: nd6_ns_input(struct mbuf *m, int off, int icmp6len)
1.2 itojun 100: {
1.119 ozaki-r 101: struct ifnet *ifp;
1.2 itojun 102: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.16 itojun 103: struct nd_neighbor_solicit *nd_ns;
1.2 itojun 104: struct in6_addr saddr6 = ip6->ip6_src;
105: struct in6_addr daddr6 = ip6->ip6_dst;
1.16 itojun 106: struct in6_addr taddr6;
1.2 itojun 107: struct in6_addr myaddr6;
108: char *lladdr = NULL;
1.127 ozaki-r 109: struct ifaddr *ifa = NULL;
1.2 itojun 110: int lladdrlen = 0;
111: int anycast = 0, proxy = 0, tentative = 0;
1.39 itojun 112: int router = ip6_forwarding;
1.2 itojun 113: int tlladdr;
114: union nd_opts ndopts;
1.78 dyoung 115: const struct sockaddr_dl *proxydl = NULL;
1.119 ozaki-r 116: struct psref psref;
1.127 ozaki-r 117: struct psref psref_ia;
1.135 ryo 118: char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN];
1.119 ozaki-r 119:
120: ifp = m_get_rcvif_psref(m, &psref);
121: if (ifp == NULL)
122: goto freeit;
1.2 itojun 123:
1.26 itojun 124: IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
125: if (nd_ns == NULL) {
1.85 thorpej 126: ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1.119 ozaki-r 127: m_put_rcvif_psref(ifp, &psref);
1.26 itojun 128: return;
129: }
130: ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
131: taddr6 = nd_ns->nd_ns_target;
1.59 rpaulo 132: if (in6_setscope(&taddr6, ifp, NULL) != 0)
133: goto bad;
1.26 itojun 134:
1.2 itojun 135: if (ip6->ip6_hlim != 255) {
1.114 ozaki-r 136: nd6log(LOG_ERR, "invalid hlim (%d) from %s to %s on %s\n",
1.136 christos 137: ip6->ip6_hlim, IN6_PRINT(ip6buf, &ip6->ip6_src),
138: IN6_PRINT(ip6buf2, &ip6->ip6_dst), if_name(ifp));
1.26 itojun 139: goto bad;
1.2 itojun 140: }
141:
142: if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
1.61 rpaulo 143: /* dst has to be a solicited node multicast address. */
1.39 itojun 144: /* don't check ifindex portion */
145: if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
146: daddr6.s6_addr32[1] == 0 &&
147: daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
148: daddr6.s6_addr8[12] == 0xff) {
1.31 itojun 149: ; /* good */
1.2 itojun 150: } else {
1.114 ozaki-r 151: nd6log(LOG_INFO, "bad DAD packet (wrong ip6 dst)\n");
1.2 itojun 152: goto bad;
153: }
1.89 matt 154: } else {
1.99 roy 155: struct sockaddr_in6 ssin6;
156:
1.89 matt 157: /*
158: * Make sure the source address is from a neighbor's address.
159: */
1.99 roy 160: sockaddr_in6_init(&ssin6, &saddr6, 0, 0, 0);
161: if (nd6_is_addr_neighbor(&ssin6, ifp) == 0) {
1.117 is 162: nd6log(LOG_INFO,
163: "NS packet from non-neighbor %s on %s\n",
1.136 christos 164: IN6_PRINT(ip6buf, &saddr6), if_name(ifp));
1.89 matt 165: goto bad;
166: }
1.2 itojun 167: }
168:
169: if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
1.114 ozaki-r 170: nd6log(LOG_INFO, "bad NS target (multicast)\n");
1.2 itojun 171: goto bad;
172: }
173:
174: icmp6len -= sizeof(*nd_ns);
175: nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
176: if (nd6_options(&ndopts) < 0) {
1.114 ozaki-r 177: nd6log(LOG_INFO, "invalid ND option, ignored\n");
1.26 itojun 178: /* nd6_options have incremented stats */
179: goto freeit;
1.2 itojun 180: }
181:
182: if (ndopts.nd_opts_src_lladdr) {
1.31 itojun 183: lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
1.2 itojun 184: lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
185: }
1.42 itojun 186:
1.2 itojun 187: if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
1.114 ozaki-r 188: nd6log(LOG_INFO,
189: "bad DAD packet (link-layer address option)\n");
1.2 itojun 190: goto bad;
191: }
192:
193: /*
194: * Attaching target link-layer address to the NA?
195: * (RFC 2461 7.2.4)
196: *
1.62 rpaulo 197: * NS IP dst is multicast MUST add
198: * Otherwise MAY be omitted
1.2 itojun 199: *
1.62 rpaulo 200: * In this implementation, we omit the target link-layer address
1.156 maxv 201: * in the "MAY" case.
1.2 itojun 202: */
203: #if 0 /* too much! */
204: ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6);
205: if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST))
206: tlladdr = 0;
207: else
208: #endif
209: if (!IN6_IS_ADDR_MULTICAST(&daddr6))
210: tlladdr = 0;
211: else
212: tlladdr = 1;
213:
214: /*
215: * Target address (taddr6) must be either:
216: * (1) Valid unicast/anycast address for my receiving interface,
217: * (2) Unicast address for which I'm offering proxy service, or
218: * (3) "tentative" address on which DAD is being performed.
219: */
220: /* (1) and (3) check. */
1.64 liamjfoy 221: #if NCARP > 0
1.127 ozaki-r 222: if (ifp->if_carp && ifp->if_type != IFT_CARP) {
223: int s = pserialize_read_enter();
1.64 liamjfoy 224: ifa = carp_iamatch6(ifp->if_carp, &taddr6);
1.127 ozaki-r 225: if (ifa != NULL)
226: ifa_acquire(ifa, &psref_ia);
227: pserialize_read_exit(s);
228: } else
1.64 liamjfoy 229: ifa = NULL;
230: if (!ifa)
1.127 ozaki-r 231: ifa = (struct ifaddr *)in6ifa_ifpwithaddr_psref(ifp, &taddr6,
232: &psref_ia);
1.64 liamjfoy 233: #else
1.127 ozaki-r 234: ifa = (struct ifaddr *)in6ifa_ifpwithaddr_psref(ifp, &taddr6,
235: &psref_ia);
1.64 liamjfoy 236: #endif
1.2 itojun 237:
238: /* (2) check. */
1.62 rpaulo 239: if (ifa == NULL) {
1.2 itojun 240: struct rtentry *rt;
241: struct sockaddr_in6 tsin6;
242:
1.81 dyoung 243: sockaddr_in6_init(&tsin6, &taddr6, 0, 0, 0);
1.2 itojun 244:
1.123 ozaki-r 245: rt = rtalloc1(sin6tosa(&tsin6), 0);
1.16 itojun 246: if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 &&
247: rt->rt_gateway->sa_family == AF_LINK) {
1.2 itojun 248: /*
1.16 itojun 249: * proxy NDP for single entry
1.2 itojun 250: */
1.127 ozaki-r 251: ifa = (struct ifaddr *)in6ifa_ifpforlinklocal_psref(ifp,
252: IN6_IFF_NOTREADY|IN6_IFF_ANYCAST, &psref_ia);
1.16 itojun 253: if (ifa) {
1.2 itojun 254: proxy = 1;
1.78 dyoung 255: proxydl = satocsdl(rt->rt_gateway);
1.39 itojun 256: router = 0; /* XXX */
1.16 itojun 257: }
1.2 itojun 258: }
1.16 itojun 259: if (rt)
1.132 ozaki-r 260: rt_unref(rt);
1.2 itojun 261: }
1.62 rpaulo 262: if (ifa == NULL) {
1.2 itojun 263: /*
1.60 wiz 264: * We've got an NS packet, and we don't have that address
1.2 itojun 265: * assigned for us. We MUST silently ignore it.
266: * See RFC2461 7.2.3.
267: */
1.16 itojun 268: goto freeit;
1.2 itojun 269: }
1.9 itojun 270: myaddr6 = *IFA_IN6(ifa);
1.2 itojun 271: anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
272: tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
273: if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
1.16 itojun 274: goto freeit;
1.2 itojun 275:
276: if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
1.114 ozaki-r 277: nd6log(LOG_INFO, "lladdrlen mismatch for %s "
1.2 itojun 278: "(if %d, NS packet %d)\n",
1.136 christos 279: IN6_PRINT(ip6buf, &taddr6),
1.135 ryo 280: ifp->if_addrlen, lladdrlen - 2);
1.26 itojun 281: goto bad;
1.2 itojun 282: }
283:
284: if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
1.114 ozaki-r 285: nd6log(LOG_INFO, "duplicate IP6 address %s\n",
1.136 christos 286: IN6_PRINT(ip6buf, &saddr6));
1.16 itojun 287: goto freeit;
1.2 itojun 288: }
289:
290: /*
291: * We have neighbor solicitation packet, with target address equals to
292: * one of my tentative address.
293: *
294: * src addr how to process?
295: * --- ---
296: * multicast of course, invalid (rejected in ip6_input)
297: * unicast somebody is doing address resolution -> ignore
298: * unspec dup address detection
299: *
300: * The processing is defined in RFC 2462.
301: */
302: if (tentative) {
303: /*
304: * If source address is unspecified address, it is for
1.61 rpaulo 305: * duplicate address detection.
1.2 itojun 306: *
307: * If not, the packet is for addess resolution;
308: * silently ignore it.
309: */
1.166 ! roy 310: if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
! 311: struct sockaddr_dl sdl, *sdlp;
! 312:
! 313: if (lladdr != NULL)
! 314: sdlp = sockaddr_dl_init(&sdl, sizeof(sdl),
! 315: ifp->if_index, ifp->if_type,
! 316: NULL, 0, lladdr, lladdrlen);
! 317: else
! 318: sdlp = NULL;
! 319: nd6_dad_input(ifa, ndopts.nd_opts_nonce, sdlp);
! 320: }
1.16 itojun 321: goto freeit;
1.2 itojun 322: }
1.161 roy 323:
1.162 roy 324: /*
325: * It looks that sender is performing DAD.
326: * Check that the nonce is not being used by the same address
327: * on another interface.
328: */
329: if (IN6_IS_ADDR_UNSPECIFIED(&saddr6) && ndopts.nd_opts_nonce != NULL) {
330: if (nd6_dad_ownnonce(ifa, ndopts.nd_opts_nonce))
331: goto freeit;
332: }
333:
1.127 ozaki-r 334: ifa_release(ifa, &psref_ia);
335: ifa = NULL;
1.2 itojun 336:
337: /*
338: * If the source address is unspecified address, entries must not
339: * be created or updated.
340: * It looks that sender is performing DAD. Output NA toward
341: * all-node multicast address, to tell the sender that I'm using
342: * the address.
343: * S bit ("solicited") must be zero.
344: */
345: if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
1.59 rpaulo 346: struct in6_addr in6_all;
347:
348: in6_all = in6addr_linklocal_allnodes;
349: if (in6_setscope(&in6_all, ifp, NULL) != 0)
350: goto bad;
351: nd6_na_output(ifp, &in6_all, &taddr6,
1.39 itojun 352: ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
1.59 rpaulo 353: (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0),
1.78 dyoung 354: tlladdr, (const struct sockaddr *)proxydl);
1.16 itojun 355: goto freeit;
1.2 itojun 356: }
357:
1.7 itojun 358: nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0);
1.2 itojun 359:
360: nd6_na_output(ifp, &saddr6, &taddr6,
1.39 itojun 361: ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
362: (router ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED,
1.78 dyoung 363: tlladdr, (const struct sockaddr *)proxydl);
1.16 itojun 364: freeit:
1.127 ozaki-r 365: ifa_release(ifa, &psref_ia);
1.119 ozaki-r 366: m_put_rcvif_psref(ifp, &psref);
1.16 itojun 367: m_freem(m);
1.2 itojun 368: return;
369:
370: bad:
1.136 christos 371: nd6log(LOG_ERR, "src=%s\n", IN6_PRINT(ip6buf, &saddr6));
372: nd6log(LOG_ERR, "dst=%s\n", IN6_PRINT(ip6buf, &daddr6));
373: nd6log(LOG_ERR, "tgt=%s\n", IN6_PRINT(ip6buf, &taddr6));
1.85 thorpej 374: ICMP6_STATINC(ICMP6_STAT_BADNS);
1.127 ozaki-r 375: ifa_release(ifa, &psref_ia);
1.119 ozaki-r 376: m_put_rcvif_psref(ifp, &psref);
1.16 itojun 377: m_freem(m);
1.2 itojun 378: }
379:
380: /*
1.61 rpaulo 381: * Output a Neighbor Solicitation Message. Caller specifies:
1.2 itojun 382: * - ICMP6 header source IP6 address
383: * - ND6 header target IP6 address
384: * - ND6 header source datalink address
385: *
386: * Based on RFC 2461
1.61 rpaulo 387: * Based on RFC 2462 (duplicate address detection)
1.2 itojun 388: */
389: void
1.72 dyoung 390: nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6,
391: const struct in6_addr *taddr6,
1.111 ozaki-r 392: struct in6_addr *hsrc,
1.149 roy 393: uint8_t *nonce /* duplicate address detection */)
1.2 itojun 394: {
395: struct mbuf *m;
396: struct ip6_hdr *ip6;
397: struct nd_neighbor_solicit *nd_ns;
1.59 rpaulo 398: struct in6_addr *src, src_in;
1.2 itojun 399: struct ip6_moptions im6o;
400: int icmp6len;
1.15 itojun 401: int maxlen;
1.80 dyoung 402: const void *mac;
1.73 dyoung 403: struct route ro;
1.39 itojun 404:
1.2 itojun 405: if (IN6_IS_ADDR_MULTICAST(taddr6))
406: return;
407:
1.82 dyoung 408: memset(&ro, 0, sizeof(ro));
409:
1.15 itojun 410: /* estimate the size of message */
411: maxlen = sizeof(*ip6) + sizeof(*nd_ns);
412: maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
1.155 maxv 413: KASSERTMSG(max_linkhdr + maxlen <= MCLBYTES,
414: "max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
1.138 ozaki-r 415: max_linkhdr, maxlen, MCLBYTES);
1.15 itojun 416:
417: MGETHDR(m, M_DONTWAIT, MT_DATA);
418: if (m && max_linkhdr + maxlen >= MHLEN) {
419: MCLGET(m, M_DONTWAIT);
420: if ((m->m_flags & M_EXT) == 0) {
421: m_free(m);
422: m = NULL;
423: }
424: }
425: if (m == NULL)
1.2 itojun 426: return;
1.118 ozaki-r 427: m_reset_rcvif(m);
1.2 itojun 428:
429: if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
430: m->m_flags |= M_MCAST;
1.120 ozaki-r 431: im6o.im6o_multicast_if_index = if_get_index(ifp);
1.2 itojun 432: im6o.im6o_multicast_hlim = 255;
433: im6o.im6o_multicast_loop = 0;
434: }
435:
436: icmp6len = sizeof(*nd_ns);
437: m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
1.164 maxv 438: m->m_data += max_linkhdr; /* or m_align() equivalent? */
1.2 itojun 439:
440: /* fill neighbor solicitation packet */
441: ip6 = mtod(m, struct ip6_hdr *);
442: ip6->ip6_flow = 0;
1.10 itojun 443: ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
444: ip6->ip6_vfc |= IPV6_VERSION;
1.2 itojun 445: /* ip6->ip6_plen will be set later */
446: ip6->ip6_nxt = IPPROTO_ICMPV6;
447: ip6->ip6_hlim = 255;
448: if (daddr6)
1.59 rpaulo 449: ip6->ip6_dst = *daddr6;
1.2 itojun 450: else {
1.59 rpaulo 451: ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
452: ip6->ip6_dst.s6_addr16[1] = 0;
453: ip6->ip6_dst.s6_addr32[1] = 0;
454: ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
455: ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
456: ip6->ip6_dst.s6_addr8[12] = 0xff;
457: if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
458: goto bad;
1.2 itojun 459: }
1.149 roy 460: if (nonce == NULL) {
1.127 ozaki-r 461: int s;
1.2 itojun 462: /*
463: * RFC2461 7.2.2:
464: * "If the source address of the packet prompting the
465: * solicitation is the same as one of the addresses assigned
466: * to the outgoing interface, that address SHOULD be placed
467: * in the IP Source Address of the outgoing solicitation.
468: * Otherwise, any one of the addresses assigned to the
469: * interface should be used."
470: *
471: * We use the source address for the prompting packet
1.59 rpaulo 472: * (hsrc), if:
473: * - hsrc is given from the caller (by giving "ln"), and
474: * - hsrc belongs to the outgoing interface.
1.39 itojun 475: * Otherwise, we perform the source address selection as usual.
1.2 itojun 476: */
1.127 ozaki-r 477: s = pserialize_read_enter();
1.153 ozaki-r 478: if (hsrc && in6ifa_ifpwithaddr(ifp, hsrc)) {
479: pserialize_read_exit(s);
1.59 rpaulo 480: src = hsrc;
1.153 ozaki-r 481: } else {
1.39 itojun 482: int error;
1.59 rpaulo 483: struct sockaddr_in6 dst_sa;
1.39 itojun 484:
1.153 ozaki-r 485: pserialize_read_exit(s);
486:
1.81 dyoung 487: sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0);
1.59 rpaulo 488:
1.129 ozaki-r 489: error = in6_selectsrc(&dst_sa, NULL,
490: NULL, &ro, NULL, NULL, NULL, &src_in);
491: if (error != 0) {
1.135 ryo 492: char ip6buf[INET6_ADDRSTRLEN];
1.114 ozaki-r 493: nd6log(LOG_DEBUG, "source can't be "
1.39 itojun 494: "determined: dst=%s, error=%d\n",
1.136 christos 495: IN6_PRINT(ip6buf, &dst_sa.sin6_addr),
1.135 ryo 496: error);
1.127 ozaki-r 497: pserialize_read_exit(s);
1.39 itojun 498: goto bad;
1.2 itojun 499: }
1.129 ozaki-r 500: src = &src_in;
1.2 itojun 501: }
502: } else {
503: /*
504: * Source address for DAD packet must always be IPv6
505: * unspecified address. (0::0)
1.39 itojun 506: * We actually don't have to 0-clear the address (we did it
507: * above), but we do so here explicitly to make the intention
508: * clearer.
1.2 itojun 509: */
1.92 cegger 510: memset(&src_in, 0, sizeof(src_in));
1.59 rpaulo 511: src = &src_in;
1.2 itojun 512: }
1.59 rpaulo 513: ip6->ip6_src = *src;
1.2 itojun 514: nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
515: nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
516: nd_ns->nd_ns_code = 0;
517: nd_ns->nd_ns_reserved = 0;
518: nd_ns->nd_ns_target = *taddr6;
1.59 rpaulo 519: in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
1.2 itojun 520:
521: /*
522: * Add source link-layer address option.
523: *
524: * spec implementation
525: * --- ---
526: * DAD packet MUST NOT do not add the option
527: * there's no link layer address:
528: * impossible do not add the option
529: * there's link layer address:
530: * Multicast NS MUST add one add the option
531: * Unicast NS SHOULD add one add the option
532: */
1.149 roy 533: if (nonce == NULL && (mac = nd6_ifptomac(ifp))) {
1.2 itojun 534: int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
535: struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
1.8 is 536: /* 8 byte alignments... */
537: optlen = (optlen + 7) & ~7;
1.42 itojun 538:
1.2 itojun 539: m->m_pkthdr.len += optlen;
540: m->m_len += optlen;
541: icmp6len += optlen;
1.92 cegger 542: memset((void *)nd_opt, 0, optlen);
1.2 itojun 543: nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
544: nd_opt->nd_opt_len = optlen >> 3;
1.94 tsutsui 545: memcpy((void *)(nd_opt + 1), mac, ifp->if_addrlen);
1.2 itojun 546: }
547:
1.149 roy 548: /* Add a nonce option (RFC 3971) to detect looped back NS messages.
549: * This behavior is documented in RFC 7527. */
550: if (nonce != NULL) {
551: int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
552: struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
553:
554: /* 8-byte alignment is required. */
555: optlen = (optlen + 7) & ~7;
556: m->m_pkthdr.len += optlen;
557: m->m_len += optlen;
558: icmp6len += optlen;
559: memset(nd_opt, 0, optlen);
560: nd_opt->nd_opt_type = ND_OPT_NONCE;
561: nd_opt->nd_opt_len = optlen >> 3;
562: memcpy(nd_opt + 1, nonce, ND_OPT_NONCE_LEN);
563: }
564:
1.51 itojun 565: ip6->ip6_plen = htons((u_int16_t)icmp6len);
1.2 itojun 566: nd_ns->nd_ns_cksum = 0;
1.39 itojun 567: nd_ns->nd_ns_cksum =
568: in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
1.2 itojun 569:
1.149 roy 570: ip6_output(m, NULL, &ro, nonce != NULL ? IPV6_UNSPECSRC : 0,
571: &im6o, NULL, NULL);
1.32 itojun 572: icmp6_ifstat_inc(ifp, ifs6_out_msg);
573: icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
1.85 thorpej 574: ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_NEIGHBOR_SOLICIT);
1.32 itojun 575:
1.73 dyoung 576: rtcache_free(&ro);
1.32 itojun 577: return;
578:
579: bad:
1.73 dyoung 580: rtcache_free(&ro);
1.32 itojun 581: m_freem(m);
582: return;
1.2 itojun 583: }
584:
585: /*
586: * Neighbor advertisement input handling.
587: *
588: * Based on RFC 2461
1.61 rpaulo 589: * Based on RFC 2462 (duplicate address detection)
1.16 itojun 590: *
591: * the following items are not implemented yet:
592: * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
593: * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
1.2 itojun 594: */
595: void
1.72 dyoung 596: nd6_na_input(struct mbuf *m, int off, int icmp6len)
1.2 itojun 597: {
1.119 ozaki-r 598: struct ifnet *ifp;
1.2 itojun 599: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.16 itojun 600: struct nd_neighbor_advert *nd_na;
1.2 itojun 601: struct in6_addr saddr6 = ip6->ip6_src;
602: struct in6_addr daddr6 = ip6->ip6_dst;
1.16 itojun 603: struct in6_addr taddr6;
604: int flags;
605: int is_router;
606: int is_solicited;
607: int is_override;
1.2 itojun 608: char *lladdr = NULL;
609: int lladdrlen = 0;
610: struct ifaddr *ifa;
1.115 ozaki-r 611: struct llentry *ln = NULL;
1.2 itojun 612: union nd_opts ndopts;
1.99 roy 613: struct sockaddr_in6 ssin6;
1.103 roy 614: int rt_announce;
1.116 ozaki-r 615: bool checklink = false;
1.119 ozaki-r 616: struct psref psref;
1.127 ozaki-r 617: struct psref psref_ia;
1.135 ryo 618: char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN];
1.119 ozaki-r 619:
620: ifp = m_get_rcvif_psref(m, &psref);
621: if (ifp == NULL)
622: goto freeit;
1.2 itojun 623:
624: if (ip6->ip6_hlim != 255) {
1.114 ozaki-r 625: nd6log(LOG_ERR,
626: "invalid hlim (%d) from %s to %s on %s\n",
1.136 christos 627: ip6->ip6_hlim, IN6_PRINT(ip6buf, &ip6->ip6_src),
628: IN6_PRINT(ip6buf2, &ip6->ip6_dst), if_name(ifp));
1.26 itojun 629: goto bad;
1.16 itojun 630: }
631:
632: IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
633: if (nd_na == NULL) {
1.119 ozaki-r 634: m_put_rcvif_psref(ifp, &psref);
1.85 thorpej 635: ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1.2 itojun 636: return;
637: }
1.59 rpaulo 638:
1.16 itojun 639: flags = nd_na->nd_na_flags_reserved;
640: is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
641: is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
642: is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
1.2 itojun 643:
1.59 rpaulo 644: taddr6 = nd_na->nd_na_target;
1.119 ozaki-r 645: if (in6_setscope(&taddr6, ifp, NULL)) {
1.145 maxv 646: goto bad;
1.119 ozaki-r 647: }
1.2 itojun 648:
649: if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
1.114 ozaki-r 650: nd6log(LOG_ERR, "invalid target address %s\n",
1.136 christos 651: IN6_PRINT(ip6buf, &taddr6));
1.26 itojun 652: goto bad;
1.2 itojun 653: }
1.39 itojun 654: if (is_solicited && IN6_IS_ADDR_MULTICAST(&daddr6)) {
1.114 ozaki-r 655: nd6log(LOG_ERR, "a solicited adv is multicasted\n");
1.39 itojun 656: goto bad;
657: }
1.2 itojun 658:
659: icmp6len -= sizeof(*nd_na);
660: nd6_option_init(nd_na + 1, icmp6len, &ndopts);
661: if (nd6_options(&ndopts) < 0) {
1.114 ozaki-r 662: nd6log(LOG_INFO, "invalid ND option, ignored\n");
1.26 itojun 663: /* nd6_options have incremented stats */
1.16 itojun 664: goto freeit;
1.2 itojun 665: }
666:
1.163 roy 667: if (ndopts.nd_opts_tgt_lladdr != NULL) {
668: struct ifnet *ifp_ll;
669: struct psref psref_ll;
670:
1.2 itojun 671: lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
672: lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
1.163 roy 673:
674: if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
675: nd6log(LOG_INFO, "lladdrlen mismatch for %s "
676: "(if %d, NA packet %d)\n", IN6_PRINT(ip6buf, &taddr6),
677: ifp->if_addrlen, lladdrlen - 2);
678: goto bad;
679: }
680:
681: ifp_ll = if_get_bylla(lladdr, ifp->if_addrlen, &psref_ll);
682: if (ifp_ll != NULL) {
683: /* it's from me, ignore it. */
684: if_put(ifp_ll, &psref_ll);
685: goto freeit;
686: }
1.2 itojun 687: }
688:
1.127 ozaki-r 689: ifa = (struct ifaddr *)in6ifa_ifpwithaddr_psref(ifp, &taddr6, &psref_ia);
1.2 itojun 690:
691: /*
692: * Target address matches one of my interface address.
693: *
694: * If my address is tentative, this means that there's somebody
695: * already using the same address as mine. This indicates DAD failure.
696: * This is defined in RFC 2462.
697: *
698: * Otherwise, process as defined in RFC 2461.
699: */
700: if (ifa) {
1.166 ! roy 701: if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE) {
! 702: struct sockaddr_dl sdl, *sdlp;
! 703:
! 704: if (lladdr != NULL)
! 705: sdlp = sockaddr_dl_init(&sdl, sizeof(sdl),
! 706: ifp->if_index, ifp->if_type,
! 707: NULL, 0, lladdr, lladdrlen);
! 708: else
! 709: sdlp = NULL;
! 710: nd6_dad_input(ifa, NULL, sdlp);
! 711: } else
1.159 roy 712: log(LOG_ERR,
713: "nd6_na_input: duplicate IP6 address %s\n",
714: IN6_PRINT(ip6buf, &taddr6));
1.127 ozaki-r 715: ifa_release(ifa, &psref_ia);
716: ifa = NULL;
1.16 itojun 717: goto freeit;
1.2 itojun 718: }
1.99 roy 719:
1.90 matt 720: /*
721: * Make sure the source address is from a neighbor's address.
722: */
1.99 roy 723: sockaddr_in6_init(&ssin6, &saddr6, 0, 0, 0);
724: if (nd6_is_addr_neighbor(&ssin6, ifp) == 0) {
1.117 is 725: nd6log(LOG_INFO, "ND packet from non-neighbor %s on %s\n",
1.136 christos 726: IN6_PRINT(ip6buf, &saddr6), if_name(ifp));
1.90 matt 727: goto bad;
728: }
1.2 itojun 729:
730: /*
1.39 itojun 731: * If no neighbor cache entry is found, NA SHOULD silently be
732: * discarded.
1.2 itojun 733: */
1.115 ozaki-r 734: ln = nd6_lookup(&taddr6, ifp, true);
735: if (ln == NULL)
1.16 itojun 736: goto freeit;
1.2 itojun 737:
1.103 roy 738: rt_announce = 0;
1.2 itojun 739: if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
740: /*
741: * If the link-layer has address, and no lladdr option came,
742: * discard the packet.
743: */
744: if (ifp->if_addrlen && !lladdr)
1.16 itojun 745: goto freeit;
1.2 itojun 746:
747: /*
748: * Record link-layer address, and update the state.
749: */
1.115 ozaki-r 750: memcpy(&ln->ll_addr, lladdr, ifp->if_addrlen);
751: ln->la_flags |= LLE_VALID;
1.103 roy 752: rt_announce = 1;
1.2 itojun 753: if (is_solicited) {
754: ln->ln_state = ND6_LLINFO_REACHABLE;
1.27 itojun 755: ln->ln_byhint = 0;
1.47 itojun 756: if (!ND6_LLINFO_PERMANENT(ln)) {
757: nd6_llinfo_settimer(ln,
1.113 ozaki-r 758: ND_IFINFO(ln->lle_tbl->llt_ifp)->reachable * hz);
1.47 itojun 759: }
1.28 itojun 760: } else {
1.2 itojun 761: ln->ln_state = ND6_LLINFO_STALE;
1.113 ozaki-r 762: nd6_llinfo_settimer(ln, nd6_gctimer * hz);
1.31 itojun 763: }
764: if ((ln->ln_router = is_router) != 0) {
765: /*
766: * This means a router's state has changed from
767: * non-reachable to probably reachable, and might
768: * affect the status of associated prefixes..
769: */
1.116 ozaki-r 770: checklink = true;
1.28 itojun 771: }
1.2 itojun 772: } else {
773: int llchange;
774:
775: /*
776: * Check if the link-layer address has changed or not.
777: */
1.62 rpaulo 778: if (lladdr == NULL)
1.2 itojun 779: llchange = 0;
780: else {
1.115 ozaki-r 781: if (ln->la_flags & LLE_VALID) {
782: if (memcmp(lladdr, &ln->ll_addr, ifp->if_addrlen))
1.103 roy 783: llchange = rt_announce = 1;
1.2 itojun 784: else
785: llchange = 0;
786: } else
1.103 roy 787: llchange = rt_announce = 1;
1.2 itojun 788: }
789:
790: /*
791: * This is VERY complex. Look at it with care.
792: *
793: * override solicit lladdr llchange action
794: * (L: record lladdr)
795: *
796: * 0 0 n -- (2c)
797: * 0 0 y n (2b) L
798: * 0 0 y y (1) REACHABLE->STALE
799: * 0 1 n -- (2c) *->REACHABLE
800: * 0 1 y n (2b) L *->REACHABLE
801: * 0 1 y y (1) REACHABLE->STALE
802: * 1 0 n -- (2a)
803: * 1 0 y n (2a) L
804: * 1 0 y y (2a) L *->STALE
805: * 1 1 n -- (2a) *->REACHABLE
806: * 1 1 y n (2a) L *->REACHABLE
807: * 1 1 y y (2a) L *->REACHABLE
808: */
1.62 rpaulo 809: if (!is_override && lladdr != NULL && llchange) { /* (1) */
1.2 itojun 810: /*
811: * If state is REACHABLE, make it STALE.
812: * no other updates should be done.
813: */
1.28 itojun 814: if (ln->ln_state == ND6_LLINFO_REACHABLE) {
1.2 itojun 815: ln->ln_state = ND6_LLINFO_STALE;
1.113 ozaki-r 816: nd6_llinfo_settimer(ln, nd6_gctimer * hz);
1.28 itojun 817: }
1.16 itojun 818: goto freeit;
1.2 itojun 819: } else if (is_override /* (2a) */
1.62 rpaulo 820: || (!is_override && lladdr != NULL && !llchange) /* (2b) */
821: || lladdr == NULL) { /* (2c) */
1.2 itojun 822: /*
823: * Update link-local address, if any.
824: */
1.62 rpaulo 825: if (lladdr != NULL) {
1.115 ozaki-r 826: memcpy(&ln->ll_addr, lladdr, ifp->if_addrlen);
827: ln->la_flags |= LLE_VALID;
1.2 itojun 828: }
829:
830: /*
831: * If solicited, make the state REACHABLE.
832: * If not solicited and the link-layer address was
833: * changed, make it STALE.
834: */
835: if (is_solicited) {
836: ln->ln_state = ND6_LLINFO_REACHABLE;
1.27 itojun 837: ln->ln_byhint = 0;
1.47 itojun 838: if (!ND6_LLINFO_PERMANENT(ln)) {
839: nd6_llinfo_settimer(ln,
1.113 ozaki-r 840: ND_IFINFO(ifp)->reachable * hz);
1.2 itojun 841: }
842: } else {
1.28 itojun 843: if (lladdr && llchange) {
1.2 itojun 844: ln->ln_state = ND6_LLINFO_STALE;
1.47 itojun 845: nd6_llinfo_settimer(ln,
1.113 ozaki-r 846: nd6_gctimer * hz);
1.28 itojun 847: }
1.2 itojun 848: }
849: }
850:
851: if (ln->ln_router && !is_router) {
852: /*
853: * The peer dropped the router flag.
854: * Remove the sender from the Default Router List and
855: * update the Destination Cache entries.
856: */
857: struct nd_defrouter *dr;
1.77 dyoung 858: const struct in6_addr *in6;
1.2 itojun 859:
1.115 ozaki-r 860: in6 = &ln->r_l3addr.addr6;
1.29 itojun 861:
1.134 ozaki-r 862: ND6_WLOCK();
1.131 ozaki-r 863: dr = nd6_defrouter_lookup(in6, ln->lle_tbl->llt_ifp);
1.2 itojun 864: if (dr)
1.131 ozaki-r 865: nd6_defrtrlist_del(dr, NULL);
1.46 itojun 866: else if (!ip6_forwarding) {
1.2 itojun 867: /*
868: * Even if the neighbor is not in the default
869: * router list, the neighbor may be used
870: * as a next hop for some destinations
871: * (e.g. redirect case). So we must
1.131 ozaki-r 872: * call nd6_rt_flush explicitly.
1.2 itojun 873: */
1.131 ozaki-r 874: nd6_rt_flush(&ip6->ip6_src, ln->lle_tbl->llt_ifp);
1.2 itojun 875: }
1.134 ozaki-r 876: ND6_UNLOCK();
1.2 itojun 877: }
878: ln->ln_router = is_router;
879: }
1.115 ozaki-r 880: /*
881: * XXX: does this matter?
882: * rt->rt_flags &= ~RTF_REJECT;
883: */
1.2 itojun 884: ln->ln_asked = 0;
1.115 ozaki-r 885: nd6_llinfo_release_pkts(ln, ifp);
886: /* FIXME */
887: #if 0
1.103 roy 888: if (rt_announce) /* tell user process about any new lladdr */
1.106 roy 889: rt_newmsg(RTM_CHANGE, rt);
1.115 ozaki-r 890: #endif
1.16 itojun 891:
892: freeit:
1.115 ozaki-r 893: if (ln != NULL)
894: LLE_WUNLOCK(ln);
895:
1.134 ozaki-r 896: if (checklink) {
897: ND6_WLOCK();
1.131 ozaki-r 898: nd6_pfxlist_onlink_check();
1.134 ozaki-r 899: ND6_UNLOCK();
900: }
1.116 ozaki-r 901:
1.119 ozaki-r 902: m_put_rcvif_psref(ifp, &psref);
1.16 itojun 903: m_freem(m);
1.26 itojun 904: return;
905:
906: bad:
1.115 ozaki-r 907: if (ln != NULL)
908: LLE_WUNLOCK(ln);
909:
1.85 thorpej 910: ICMP6_STATINC(ICMP6_STAT_BADNA);
1.119 ozaki-r 911: m_put_rcvif_psref(ifp, &psref);
1.26 itojun 912: m_freem(m);
1.2 itojun 913: }
914:
915: /*
916: * Neighbor advertisement output handling.
917: *
918: * Based on RFC 2461
919: *
1.16 itojun 920: * the following items are not implemented yet:
921: * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
922: * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
1.2 itojun 923: */
924: void
1.83 matt 925: nd6_na_output(
926: struct ifnet *ifp,
927: const struct in6_addr *daddr6_0,
928: const struct in6_addr *taddr6,
929: u_long flags,
930: int tlladdr, /* 1 if include target link-layer address */
931: const struct sockaddr *sdl0) /* sockaddr_dl (= proxy NA) or NULL */
1.2 itojun 932: {
933: struct mbuf *m;
934: struct ip6_hdr *ip6;
935: struct nd_neighbor_advert *nd_na;
936: struct ip6_moptions im6o;
1.73 dyoung 937: struct sockaddr *dst;
938: union {
939: struct sockaddr dst;
940: struct sockaddr_in6 dst6;
941: } u;
1.129 ozaki-r 942: struct in6_addr daddr6;
1.39 itojun 943: int icmp6len, maxlen, error;
1.78 dyoung 944: const void *mac;
1.73 dyoung 945: struct route ro;
1.39 itojun 946:
947: mac = NULL;
1.69 dyoung 948: memset(&ro, 0, sizeof(ro));
1.15 itojun 949:
1.59 rpaulo 950: daddr6 = *daddr6_0; /* make a local copy for modification */
951:
1.15 itojun 952: /* estimate the size of message */
953: maxlen = sizeof(*ip6) + sizeof(*nd_na);
954: maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
1.155 maxv 955: KASSERTMSG(max_linkhdr + maxlen <= MCLBYTES,
956: "max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
1.138 ozaki-r 957: max_linkhdr, maxlen, MCLBYTES);
1.15 itojun 958:
959: MGETHDR(m, M_DONTWAIT, MT_DATA);
960: if (m && max_linkhdr + maxlen >= MHLEN) {
961: MCLGET(m, M_DONTWAIT);
962: if ((m->m_flags & M_EXT) == 0) {
963: m_free(m);
964: m = NULL;
965: }
966: }
967: if (m == NULL)
1.2 itojun 968: return;
1.118 ozaki-r 969: m_reset_rcvif(m);
1.2 itojun 970:
1.59 rpaulo 971: if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
1.2 itojun 972: m->m_flags |= M_MCAST;
1.120 ozaki-r 973: im6o.im6o_multicast_if_index = if_get_index(ifp);
1.2 itojun 974: im6o.im6o_multicast_hlim = 255;
975: im6o.im6o_multicast_loop = 0;
976: }
977:
978: icmp6len = sizeof(*nd_na);
979: m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
1.164 maxv 980: m->m_data += max_linkhdr; /* or m_align() equivalent? */
1.2 itojun 981:
982: /* fill neighbor advertisement packet */
983: ip6 = mtod(m, struct ip6_hdr *);
984: ip6->ip6_flow = 0;
1.10 itojun 985: ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
986: ip6->ip6_vfc |= IPV6_VERSION;
1.2 itojun 987: ip6->ip6_nxt = IPPROTO_ICMPV6;
988: ip6->ip6_hlim = 255;
1.59 rpaulo 989: if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
1.2 itojun 990: /* reply to DAD */
1.59 rpaulo 991: daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
992: daddr6.s6_addr16[1] = 0;
993: daddr6.s6_addr32[1] = 0;
994: daddr6.s6_addr32[2] = 0;
995: daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
996: if (in6_setscope(&daddr6, ifp, NULL))
997: goto bad;
1.39 itojun 998:
1.2 itojun 999: flags &= ~ND_NA_FLAG_SOLICITED;
1.39 itojun 1000: }
1.59 rpaulo 1001: ip6->ip6_dst = daddr6;
1.73 dyoung 1002: sockaddr_in6_init(&u.dst6, &daddr6, 0, 0, 0);
1003: dst = &u.dst;
1.108 ozaki-r 1004: if (rtcache_setdst(&ro, dst) != 0)
1005: goto bad;
1.2 itojun 1006:
1007: /*
1008: * Select a source whose scope is the same as that of the dest.
1009: */
1.129 ozaki-r 1010: error = in6_selectsrc(satosin6(dst), NULL, NULL, &ro, NULL, NULL, NULL,
1011: &ip6->ip6_src);
1012: if (error != 0) {
1.135 ryo 1013: char ip6buf[INET6_ADDRSTRLEN];
1.114 ozaki-r 1014: nd6log(LOG_DEBUG, "source can't be "
1.39 itojun 1015: "determined: dst=%s, error=%d\n",
1.136 christos 1016: IN6_PRINT(ip6buf, &satocsin6(dst)->sin6_addr), error);
1.39 itojun 1017: goto bad;
1.2 itojun 1018: }
1019: nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1020: nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1021: nd_na->nd_na_code = 0;
1022: nd_na->nd_na_target = *taddr6;
1.59 rpaulo 1023: in6_clearscope(&nd_na->nd_na_target); /* XXX */
1.2 itojun 1024:
1025: /*
1026: * "tlladdr" indicates NS's condition for adding tlladdr or not.
1027: * see nd6_ns_input() for details.
1028: * Basically, if NS packet is sent to unicast/anycast addr,
1029: * target lladdr option SHOULD NOT be included.
1030: */
1.16 itojun 1031: if (tlladdr) {
1032: /*
1033: * sdl0 != NULL indicates proxy NA. If we do proxy, use
1034: * lladdr in sdl0. If we are not proxying (sending NA for
1035: * my address) use lladdr configured for the interface.
1036: */
1037: if (sdl0 == NULL)
1038: mac = nd6_ifptomac(ifp);
1039: else if (sdl0->sa_family == AF_LINK) {
1.78 dyoung 1040: const struct sockaddr_dl *sdl;
1041: sdl = satocsdl(sdl0);
1.16 itojun 1042: if (sdl->sdl_alen == ifp->if_addrlen)
1.78 dyoung 1043: mac = CLLADDR(sdl);
1.16 itojun 1044: }
1045: }
1046: if (tlladdr && mac) {
1.2 itojun 1047: int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1048: struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1.42 itojun 1049:
1.8 is 1050: /* roundup to 8 bytes alignment! */
1051: optlen = (optlen + 7) & ~7;
1052:
1.2 itojun 1053: m->m_pkthdr.len += optlen;
1054: m->m_len += optlen;
1055: icmp6len += optlen;
1.92 cegger 1056: memset((void *)nd_opt, 0, optlen);
1.2 itojun 1057: nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1058: nd_opt->nd_opt_len = optlen >> 3;
1.94 tsutsui 1059: memcpy((void *)(nd_opt + 1), mac, ifp->if_addrlen);
1.2 itojun 1060: } else
1061: flags &= ~ND_NA_FLAG_OVERRIDE;
1062:
1.51 itojun 1063: ip6->ip6_plen = htons((u_int16_t)icmp6len);
1.2 itojun 1064: nd_na->nd_na_flags_reserved = flags;
1065: nd_na->nd_na_cksum = 0;
1066: nd_na->nd_na_cksum =
1.39 itojun 1067: in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1.2 itojun 1068:
1.87 dyoung 1069: ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1.32 itojun 1070:
1071: icmp6_ifstat_inc(ifp, ifs6_out_msg);
1072: icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1.85 thorpej 1073: ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_NEIGHBOR_ADVERT);
1.39 itojun 1074:
1.73 dyoung 1075: rtcache_free(&ro);
1.39 itojun 1076: return;
1077:
1078: bad:
1.73 dyoung 1079: rtcache_free(&ro);
1.39 itojun 1080: m_freem(m);
1081: return;
1.2 itojun 1082: }
1083:
1.80 dyoung 1084: const void *
1085: nd6_ifptomac(const struct ifnet *ifp)
1.2 itojun 1086: {
1087: switch (ifp->if_type) {
1.8 is 1088: case IFT_ARCNET:
1.2 itojun 1089: case IFT_ETHER:
1090: case IFT_FDDI:
1.23 onoe 1091: case IFT_IEEE1394:
1.39 itojun 1092: case IFT_PROPVIRTUAL:
1.64 liamjfoy 1093: case IFT_CARP:
1.39 itojun 1094: case IFT_L2VLAN:
1095: case IFT_IEEE80211:
1.80 dyoung 1096: return CLLADDR(ifp->if_sadl);
1.2 itojun 1097: default:
1098: return NULL;
1099: }
1100: }
1101:
1102: TAILQ_HEAD(dadq_head, dadq);
1103: struct dadq {
1104: TAILQ_ENTRY(dadq) dad_list;
1105: struct ifaddr *dad_ifa;
1.149 roy 1106: int dad_count; /* max NS to send */
1107: int dad_ns_tcount; /* # of trials to send NS */
1108: int dad_ns_ocount; /* NS sent so far */
1109: int dad_ns_lcount; /* looped back NS */
1.21 itojun 1110: struct callout dad_timer_ch;
1.149 roy 1111: #define ND_OPT_NONCE_STORE 3 /* dad_count should not exceed this */
1112: /*
1113: * The default ip6_dad_count is 1 as specified by RFC 4862 and
1114: * practically must users won't exceed this.
1115: * A storage of 3 is defaulted to here, in-case the administrator wants
1116: * to match the equivalent behaviour in our ARP implementation.
1117: * This constraint could be removed by sending the on wire nonce as
1118: * hmac(key, dad_ns_ocount), but that would increase the nonce size
1119: * sent on the wire.
1120: */
1121: uint8_t dad_nonce[ND_OPT_NONCE_STORE][ND_OPT_NONCE_LEN];
1.2 itojun 1122: };
1123:
1124: static struct dadq_head dadq;
1.26 itojun 1125: static int dad_init = 0;
1.125 ozaki-r 1126: static kmutex_t nd6_dad_lock;
1.2 itojun 1127:
1128: static struct dadq *
1.158 roy 1129: nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *nonce, bool *found_nonce)
1.2 itojun 1130: {
1.162 roy 1131: struct in6_addr *myaddr6, *dadaddr6;
1132: bool match_ifa;
1.2 itojun 1133: struct dadq *dp;
1.149 roy 1134: int i, nonce_max;
1.2 itojun 1135:
1.125 ozaki-r 1136: KASSERT(mutex_owned(&nd6_dad_lock));
1.162 roy 1137: KASSERT(ifa != NULL);
1138:
1139: myaddr6 = IFA_IN6(ifa);
1140: if (nonce != NULL &&
1141: nonce->nd_opt_nonce_len != (ND_OPT_NONCE_LEN + 2) / 8)
1142: nonce = NULL;
1143: match_ifa = nonce == NULL || found_nonce == NULL || *found_nonce == false;
1144: if (found_nonce != NULL)
1145: *found_nonce = false;
1.125 ozaki-r 1146:
1.72 dyoung 1147: TAILQ_FOREACH(dp, &dadq, dad_list) {
1.162 roy 1148: if (match_ifa) {
1149: if (dp->dad_ifa != ifa)
1150: continue;
1151: } else {
1152: dadaddr6 = IFA_IN6(dp->dad_ifa);
1153: if (!IN6_ARE_ADDR_EQUAL(myaddr6, dadaddr6))
1154: continue;
1155: }
1.149 roy 1156:
1.162 roy 1157: if (nonce == NULL)
1.149 roy 1158: break;
1159:
1160: nonce_max = MIN(dp->dad_ns_ocount, ND_OPT_NONCE_STORE);
1161: for (i = 0; i < nonce_max; i++) {
1162: if (memcmp(nonce->nd_opt_nonce,
1163: dp->dad_nonce[i],
1164: ND_OPT_NONCE_LEN) == 0)
1165: break;
1166: }
1167: if (i < nonce_max) {
1168: char ip6buf[INET6_ADDRSTRLEN];
1169:
1.158 roy 1170: *found_nonce = true;
1.149 roy 1171: log(LOG_DEBUG,
1172: "%s: detected a looped back NS message for %s\n",
1173: ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???",
1.162 roy 1174: IN6_PRINT(ip6buf, myaddr6));
1.149 roy 1175: dp->dad_ns_lcount++;
1176: continue;
1177: }
1178:
1179: break;
1.2 itojun 1180: }
1.149 roy 1181: return dp;
1.2 itojun 1182: }
1183:
1.162 roy 1184: static bool
1185: nd6_dad_ownnonce(struct ifaddr *ifa, struct nd_opt_nonce *nonce)
1186: {
1187: bool found_nonce = true;
1188:
1189: mutex_enter(&nd6_dad_lock);
1190: nd6_dad_find(ifa, nonce, &found_nonce);
1191: mutex_exit(&nd6_dad_lock);
1192:
1193: return found_nonce;
1194: }
1195:
1.26 itojun 1196: static void
1.72 dyoung 1197: nd6_dad_starttimer(struct dadq *dp, int ticks)
1.26 itojun 1198: {
1199:
1200: callout_reset(&dp->dad_timer_ch, ticks,
1.144 ozaki-r 1201: (void (*)(void *))nd6_dad_timer, dp);
1.26 itojun 1202: }
1203:
1204: static void
1.152 ozaki-r 1205: nd6_dad_stoptimer(struct dadq *dp)
1.26 itojun 1206: {
1.152 ozaki-r 1207:
1208: KASSERT(mutex_owned(&nd6_dad_lock));
1.26 itojun 1209:
1.144 ozaki-r 1210: TAILQ_REMOVE(&dadq, dp, dad_list);
1.152 ozaki-r 1211: /* Tell the timer that dp is being destroyed. */
1.144 ozaki-r 1212: dp->dad_ifa = NULL;
1.152 ozaki-r 1213: callout_halt(&dp->dad_timer_ch, &nd6_dad_lock);
1214: }
1215:
1216: static void
1217: nd6_dad_destroytimer(struct dadq *dp)
1218: {
1219:
1220: KASSERT(dp->dad_ifa == NULL);
1221: callout_destroy(&dp->dad_timer_ch);
1222: kmem_intr_free(dp, sizeof(*dp));
1.26 itojun 1223: }
1224:
1.2 itojun 1225: /*
1.61 rpaulo 1226: * Start Duplicate Address Detection (DAD) for specified interface address.
1.72 dyoung 1227: *
1.100 ozaki-r 1228: * Note that callout is used when xtick > 0 and not when xtick == 0.
1229: *
1.72 dyoung 1230: * xtick: minimum delay ticks for IFF_UP event
1.2 itojun 1231: */
1232: void
1.72 dyoung 1233: nd6_dad_start(struct ifaddr *ifa, int xtick)
1.2 itojun 1234: {
1235: struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1236: struct dadq *dp;
1.135 ryo 1237: char ip6buf[INET6_ADDRSTRLEN];
1.2 itojun 1238:
1239: if (!dad_init) {
1240: TAILQ_INIT(&dadq);
1.125 ozaki-r 1241: mutex_init(&nd6_dad_lock, MUTEX_DEFAULT, IPL_NONE);
1.2 itojun 1242: dad_init++;
1243: }
1244:
1245: /*
1246: * If we don't need DAD, don't do it.
1247: * There are several cases:
1.157 ozaki-r 1248: * - DAD is disabled
1.2 itojun 1249: * - the interface address is anycast
1250: */
1251: if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1.15 itojun 1252: log(LOG_DEBUG,
1253: "nd6_dad_start: called with non-tentative address "
1.2 itojun 1254: "%s(%s)\n",
1.136 christos 1255: IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr),
1.9 itojun 1256: ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1.2 itojun 1257: return;
1258: }
1.157 ozaki-r 1259: if (ia->ia6_flags & IN6_IFF_ANYCAST || !ip6_dad_enabled()) {
1.2 itojun 1260: ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1.165 roy 1261: rt_addrmsg(RTM_NEWADDR, ifa);
1.2 itojun 1262: return;
1263: }
1.124 ozaki-r 1264: KASSERT(ifa->ifa_ifp != NULL);
1.2 itojun 1265: if (!(ifa->ifa_ifp->if_flags & IFF_UP))
1266: return;
1.125 ozaki-r 1267:
1.137 ozaki-r 1268: dp = kmem_intr_alloc(sizeof(*dp), KM_NOSLEEP);
1269:
1.125 ozaki-r 1270: mutex_enter(&nd6_dad_lock);
1.158 roy 1271: if (nd6_dad_find(ifa, NULL, NULL) != NULL) {
1.125 ozaki-r 1272: mutex_exit(&nd6_dad_lock);
1.2 itojun 1273: /* DAD already in progress */
1.137 ozaki-r 1274: if (dp != NULL)
1275: kmem_intr_free(dp, sizeof(*dp));
1.2 itojun 1276: return;
1277: }
1278:
1279: if (dp == NULL) {
1.125 ozaki-r 1280: mutex_exit(&nd6_dad_lock);
1.15 itojun 1281: log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1.2 itojun 1282: "%s(%s)\n",
1.136 christos 1283: IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr),
1.9 itojun 1284: ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1.2 itojun 1285: return;
1286: }
1287:
1288: /*
1289: * Send NS packet for DAD, ip6_dad_count times.
1290: * Note that we must delay the first transmission, if this is the
1291: * first packet to be sent from the interface after interface
1292: * (re)initialization.
1293: */
1.137 ozaki-r 1294: callout_init(&dp->dad_timer_ch, CALLOUT_MPSAFE);
1.2 itojun 1295: dp->dad_ifa = ifa;
1.101 rmind 1296: ifaref(ifa); /* just for safety */
1.2 itojun 1297: dp->dad_count = ip6_dad_count;
1.9 itojun 1298: dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1.149 roy 1299: dp->dad_ns_lcount = 0;
1.125 ozaki-r 1300: TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list);
1301:
1302: nd6log(LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1.136 christos 1303: IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr));
1.125 ozaki-r 1304:
1.63 rpaulo 1305: if (xtick == 0) {
1.9 itojun 1306: nd6_dad_ns_output(dp, ifa);
1.38 itojun 1307: nd6_dad_starttimer(dp,
1.47 itojun 1308: (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1.62 rpaulo 1309: } else
1.63 rpaulo 1310: nd6_dad_starttimer(dp, xtick);
1.125 ozaki-r 1311: mutex_exit(&nd6_dad_lock);
1.2 itojun 1312: }
1313:
1.26 itojun 1314: /*
1315: * terminate DAD unconditionally. used for address removals.
1316: */
1317: void
1.72 dyoung 1318: nd6_dad_stop(struct ifaddr *ifa)
1.26 itojun 1319: {
1320: struct dadq *dp;
1321:
1322: if (!dad_init)
1323: return;
1.125 ozaki-r 1324:
1325: mutex_enter(&nd6_dad_lock);
1.158 roy 1326: dp = nd6_dad_find(ifa, NULL, NULL);
1.62 rpaulo 1327: if (dp == NULL) {
1.125 ozaki-r 1328: mutex_exit(&nd6_dad_lock);
1.26 itojun 1329: /* DAD wasn't started yet */
1330: return;
1331: }
1332:
1.125 ozaki-r 1333: /* Prevent the timer from running anymore. */
1.152 ozaki-r 1334: nd6_dad_stoptimer(dp);
1.144 ozaki-r 1335:
1.125 ozaki-r 1336: mutex_exit(&nd6_dad_lock);
1.152 ozaki-r 1337:
1338: nd6_dad_destroytimer(dp);
1339: ifafree(ifa);
1.26 itojun 1340: }
1341:
1.2 itojun 1342: static void
1.144 ozaki-r 1343: nd6_dad_timer(struct dadq *dp)
1.2 itojun 1344: {
1.144 ozaki-r 1345: struct ifaddr *ifa;
1346: struct in6_ifaddr *ia;
1.135 ryo 1347: char ip6buf[INET6_ADDRSTRLEN];
1.137 ozaki-r 1348: bool need_free = false;
1.2 itojun 1349:
1.152 ozaki-r 1350: KERNEL_LOCK_UNLESS_NET_MPSAFE();
1.125 ozaki-r 1351: mutex_enter(&nd6_dad_lock);
1.2 itojun 1352:
1.144 ozaki-r 1353: ifa = dp->dad_ifa;
1354: if (ifa == NULL) {
1.152 ozaki-r 1355: /* dp is being destroyed by someone. Do nothing. */
1.2 itojun 1356: goto done;
1357: }
1.144 ozaki-r 1358:
1359: ia = (struct in6_ifaddr *)ifa;
1.2 itojun 1360: if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1.61 rpaulo 1361: log(LOG_ERR, "nd6_dad_timer: called with duplicate address "
1.2 itojun 1362: "%s(%s)\n",
1.136 christos 1363: IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr),
1.9 itojun 1364: ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1.2 itojun 1365: goto done;
1366: }
1367: if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1.15 itojun 1368: log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1.2 itojun 1369: "%s(%s)\n",
1.136 christos 1370: IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr),
1.9 itojun 1371: ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1372: goto done;
1373: }
1374:
1375: /* timeouted with IFF_{RUNNING,UP} check */
1376: if (dp->dad_ns_tcount > dad_maxtry) {
1.114 ozaki-r 1377: nd6log(LOG_INFO, "%s: could not run DAD, driver problem?\n",
1378: if_name(ifa->ifa_ifp));
1.9 itojun 1379:
1.152 ozaki-r 1380: nd6_dad_stoptimer(dp);
1.137 ozaki-r 1381: need_free = true;
1.2 itojun 1382: goto done;
1383: }
1384:
1385: /* Need more checks? */
1.55 itojun 1386: if (dp->dad_ns_ocount < dp->dad_count) {
1.2 itojun 1387: /*
1388: * We have more NS to go. Send NS packet for DAD.
1389: */
1.9 itojun 1390: nd6_dad_ns_output(dp, ifa);
1.38 itojun 1391: nd6_dad_starttimer(dp,
1.47 itojun 1392: (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1.2 itojun 1393: } else {
1394: /*
1.158 roy 1395: * We are done with DAD. No NA came, no NS came.
1396: * No duplicate address found.
1.2 itojun 1397: */
1.158 roy 1398: ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1.165 roy 1399: rt_addrmsg(RTM_NEWADDR, ifa);
1.2 itojun 1400:
1.158 roy 1401: nd6log(LOG_DEBUG,
1402: "%s: DAD complete for %s - no duplicates found\n",
1403: if_name(ifa->ifa_ifp),
1404: IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr));
1.2 itojun 1405:
1.158 roy 1406: nd6_dad_stoptimer(dp);
1407: need_free = true;
1.2 itojun 1408: }
1409: done:
1.125 ozaki-r 1410: mutex_exit(&nd6_dad_lock);
1.130 mlelstv 1411:
1.137 ozaki-r 1412: if (need_free) {
1.152 ozaki-r 1413: nd6_dad_destroytimer(dp);
1414: KASSERT(ifa != NULL);
1415: ifafree(ifa);
1.137 ozaki-r 1416: }
1417:
1.152 ozaki-r 1418: KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
1.2 itojun 1419: }
1420:
1.133 ozaki-r 1421: static void
1.166 ! roy 1422: nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp,
! 1423: const struct sockaddr_dl *from)
1.2 itojun 1424: {
1.147 ozaki-r 1425: struct in6_ifaddr *ia;
1.62 rpaulo 1426: struct ifnet *ifp;
1.166 ! roy 1427: char ip6buf[INET6_ADDRSTRLEN], llabuf[LLA_ADDRSTRLEN], *llastr;
1.2 itojun 1428:
1.147 ozaki-r 1429: KASSERT(mutex_owned(&nd6_dad_lock));
1430: KASSERT(ifa != NULL);
1.2 itojun 1431:
1.62 rpaulo 1432: ifp = ifa->ifa_ifp;
1.147 ozaki-r 1433: ia = (struct in6_ifaddr *)ifa;
1.2 itojun 1434:
1435: ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1436: ia->ia6_flags |= IN6_IFF_DUPLICATED;
1437:
1.166 ! roy 1438: if (__predict_false(from == NULL))
! 1439: llastr = NULL;
! 1440: else
! 1441: llastr = lla_snprintf(llabuf, sizeof(llabuf),
! 1442: CLLADDR(from), from->sdl_alen);
! 1443:
! 1444: log(LOG_ERR, "%s: DAD duplicate address %s from %s\n",
! 1445: if_name(ifp), IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr), llastr);
1.62 rpaulo 1446:
1.97 roy 1447: /* Inform the routing socket that DAD has completed */
1.166 ! roy 1448: rt_addrmsg_src(RTM_NEWADDR, ifa, (const struct sockaddr *)from);
1.97 roy 1449:
1.62 rpaulo 1450: /*
1451: * If the address is a link-local address formed from an interface
1452: * identifier based on the hardware address which is supposed to be
1453: * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1454: * operation on the interface SHOULD be disabled.
1455: * [rfc2462bis-03 Section 5.4.5]
1456: */
1457: if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1458: struct in6_addr in6;
1459:
1460: /*
1461: * To avoid over-reaction, we only apply this logic when we are
1462: * very sure that hardware addresses are supposed to be unique.
1463: */
1464: switch (ifp->if_type) {
1465: case IFT_ETHER:
1466: case IFT_FDDI:
1467: case IFT_ATM:
1468: case IFT_IEEE1394:
1469: case IFT_IEEE80211:
1470: in6 = ia->ia_addr.sin6_addr;
1471: if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1472: IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1473: ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1474: log(LOG_ERR, "%s: possible hardware address "
1475: "duplication detected, disable IPv6\n",
1476: if_name(ifp));
1477: }
1478: break;
1479: }
1480: }
1.2 itojun 1481: }
1482:
1.9 itojun 1483: static void
1.72 dyoung 1484: nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa)
1.9 itojun 1485: {
1486: struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1487: struct ifnet *ifp = ifa->ifa_ifp;
1.149 roy 1488: uint8_t *nonce;
1.9 itojun 1489:
1490: dp->dad_ns_tcount++;
1491: if ((ifp->if_flags & IFF_UP) == 0) {
1492: #if 0
1493: printf("%s: interface down?\n", if_name(ifp));
1494: #endif
1495: return;
1496: }
1497: if ((ifp->if_flags & IFF_RUNNING) == 0) {
1498: #if 0
1499: printf("%s: interface not running?\n", if_name(ifp));
1500: #endif
1501: return;
1502: }
1503:
1.65 drochner 1504: dp->dad_ns_tcount = 0;
1.149 roy 1505: nonce = dp->dad_nonce[dp->dad_ns_ocount % ND_OPT_NONCE_STORE];
1506: cprng_fast(nonce, ND_OPT_NONCE_LEN);
1.9 itojun 1507: dp->dad_ns_ocount++;
1.149 roy 1508:
1509: nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, nonce);
1.9 itojun 1510: }
1511:
1512: static void
1.166 ! roy 1513: nd6_dad_input(struct ifaddr *ifa, struct nd_opt_nonce *nonce,
! 1514: const struct sockaddr_dl *from)
1.2 itojun 1515: {
1516: struct dadq *dp;
1.158 roy 1517: bool found_nonce = false;
1.2 itojun 1518:
1.158 roy 1519: KASSERT(ifa != NULL);
1.125 ozaki-r 1520:
1521: mutex_enter(&nd6_dad_lock);
1.158 roy 1522: dp = nd6_dad_find(ifa, nonce, &found_nonce);
1523: if (!found_nonce) {
1.166 ! roy 1524: nd6_dad_duplicated(ifa, dp, from);
1.158 roy 1525: if (dp != NULL)
1.152 ozaki-r 1526: nd6_dad_stoptimer(dp);
1.2 itojun 1527: }
1.147 ozaki-r 1528: mutex_exit(&nd6_dad_lock);
1.158 roy 1529: if (dp != NULL) {
1.152 ozaki-r 1530: nd6_dad_destroytimer(dp);
1531: ifafree(ifa);
1532: }
1.2 itojun 1533: }
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