| 1 | /* $NetBSD: nd6_nbr.c,v 1.130 2016/11/15 21:17:07 mlelstv Exp $ */ |
| 2 | /* $KAME: nd6_nbr.c,v 1.61 2001/02/10 16:06:14 jinmei Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of the project nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 30 | * SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | #include <sys/cdefs.h> |
| 34 | __KERNEL_RCSID(0, "$NetBSD: nd6_nbr.c,v 1.130 2016/11/15 21:17:07 mlelstv Exp $" ); |
| 35 | |
| 36 | #ifdef _KERNEL_OPT |
| 37 | #include "opt_inet.h" |
| 38 | #include "opt_net_mpsafe.h" |
| 39 | #endif |
| 40 | |
| 41 | #include <sys/param.h> |
| 42 | #include <sys/systm.h> |
| 43 | #include <sys/malloc.h> |
| 44 | #include <sys/mbuf.h> |
| 45 | #include <sys/socket.h> |
| 46 | #include <sys/socketvar.h> |
| 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> |
| 54 | #include <sys/callout.h> |
| 55 | |
| 56 | #include <net/if.h> |
| 57 | #include <net/if_types.h> |
| 58 | #include <net/if_dl.h> |
| 59 | #include <net/route.h> |
| 60 | |
| 61 | #include <netinet/in.h> |
| 62 | #include <netinet/in_var.h> |
| 63 | #include <netinet6/in6_var.h> |
| 64 | #include <netinet6/in6_ifattach.h> |
| 65 | #include <netinet/ip6.h> |
| 66 | #include <netinet6/ip6_var.h> |
| 67 | #include <netinet6/scope6_var.h> |
| 68 | #include <netinet6/nd6.h> |
| 69 | #include <netinet/icmp6.h> |
| 70 | #include <netinet6/icmp6_private.h> |
| 71 | |
| 72 | #include "carp.h" |
| 73 | #if NCARP > 0 |
| 74 | #include <netinet/ip_carp.h> |
| 75 | #endif |
| 76 | |
| 77 | #include <net/net_osdep.h> |
| 78 | |
| 79 | struct dadq; |
| 80 | static struct dadq *nd6_dad_find(struct ifaddr *); |
| 81 | static void nd6_dad_starttimer(struct dadq *, int); |
| 82 | static void nd6_dad_stoptimer(struct dadq *); |
| 83 | static void nd6_dad_timer(struct ifaddr *); |
| 84 | static void nd6_dad_ns_output(struct dadq *, struct ifaddr *); |
| 85 | static void nd6_dad_ns_input(struct ifaddr *); |
| 86 | static void nd6_dad_na_input(struct ifaddr *); |
| 87 | |
| 88 | static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/ |
| 89 | static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ |
| 90 | |
| 91 | /* |
| 92 | * Input a Neighbor Solicitation Message. |
| 93 | * |
| 94 | * Based on RFC 2461 |
| 95 | * Based on RFC 2462 (duplicate address detection) |
| 96 | */ |
| 97 | void |
| 98 | nd6_ns_input(struct mbuf *m, int off, int icmp6len) |
| 99 | { |
| 100 | struct ifnet *ifp; |
| 101 | struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); |
| 102 | struct nd_neighbor_solicit *nd_ns; |
| 103 | struct in6_addr saddr6 = ip6->ip6_src; |
| 104 | struct in6_addr daddr6 = ip6->ip6_dst; |
| 105 | struct in6_addr taddr6; |
| 106 | struct in6_addr myaddr6; |
| 107 | char *lladdr = NULL; |
| 108 | struct ifaddr *ifa = NULL; |
| 109 | int lladdrlen = 0; |
| 110 | int anycast = 0, proxy = 0, tentative = 0; |
| 111 | int router = ip6_forwarding; |
| 112 | int tlladdr; |
| 113 | union nd_opts ndopts; |
| 114 | const struct sockaddr_dl *proxydl = NULL; |
| 115 | struct psref psref; |
| 116 | struct psref psref_ia; |
| 117 | |
| 118 | ifp = m_get_rcvif_psref(m, &psref); |
| 119 | if (ifp == NULL) |
| 120 | goto freeit; |
| 121 | |
| 122 | IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); |
| 123 | if (nd_ns == NULL) { |
| 124 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 125 | m_put_rcvif_psref(ifp, &psref); |
| 126 | return; |
| 127 | } |
| 128 | ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ |
| 129 | taddr6 = nd_ns->nd_ns_target; |
| 130 | if (in6_setscope(&taddr6, ifp, NULL) != 0) |
| 131 | goto bad; |
| 132 | |
| 133 | if (ip6->ip6_hlim != 255) { |
| 134 | nd6log(LOG_ERR, "invalid hlim (%d) from %s to %s on %s\n" , |
| 135 | ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), |
| 136 | ip6_sprintf(&ip6->ip6_dst), if_name(ifp)); |
| 137 | goto bad; |
| 138 | } |
| 139 | |
| 140 | if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { |
| 141 | /* dst has to be a solicited node multicast address. */ |
| 142 | /* don't check ifindex portion */ |
| 143 | if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL && |
| 144 | daddr6.s6_addr32[1] == 0 && |
| 145 | daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE && |
| 146 | daddr6.s6_addr8[12] == 0xff) { |
| 147 | ; /* good */ |
| 148 | } else { |
| 149 | nd6log(LOG_INFO, "bad DAD packet (wrong ip6 dst)\n" ); |
| 150 | goto bad; |
| 151 | } |
| 152 | } else { |
| 153 | struct sockaddr_in6 ssin6; |
| 154 | |
| 155 | /* |
| 156 | * Make sure the source address is from a neighbor's address. |
| 157 | */ |
| 158 | sockaddr_in6_init(&ssin6, &saddr6, 0, 0, 0); |
| 159 | if (nd6_is_addr_neighbor(&ssin6, ifp) == 0) { |
| 160 | nd6log(LOG_INFO, |
| 161 | "NS packet from non-neighbor %s on %s\n" , |
| 162 | ip6_sprintf(&saddr6), if_name(ifp)); |
| 163 | goto bad; |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | |
| 168 | if (IN6_IS_ADDR_MULTICAST(&taddr6)) { |
| 169 | nd6log(LOG_INFO, "bad NS target (multicast)\n" ); |
| 170 | goto bad; |
| 171 | } |
| 172 | |
| 173 | icmp6len -= sizeof(*nd_ns); |
| 174 | nd6_option_init(nd_ns + 1, icmp6len, &ndopts); |
| 175 | if (nd6_options(&ndopts) < 0) { |
| 176 | nd6log(LOG_INFO, "invalid ND option, ignored\n" ); |
| 177 | /* nd6_options have incremented stats */ |
| 178 | goto freeit; |
| 179 | } |
| 180 | |
| 181 | if (ndopts.nd_opts_src_lladdr) { |
| 182 | lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); |
| 183 | lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; |
| 184 | } |
| 185 | |
| 186 | if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { |
| 187 | nd6log(LOG_INFO, |
| 188 | "bad DAD packet (link-layer address option)\n" ); |
| 189 | goto bad; |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * Attaching target link-layer address to the NA? |
| 194 | * (RFC 2461 7.2.4) |
| 195 | * |
| 196 | * NS IP dst is multicast MUST add |
| 197 | * Otherwise MAY be omitted |
| 198 | * |
| 199 | * In this implementation, we omit the target link-layer address |
| 200 | * in the "MAY" case. |
| 201 | */ |
| 202 | #if 0 /* too much! */ |
| 203 | ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6); |
| 204 | if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)) |
| 205 | tlladdr = 0; |
| 206 | else |
| 207 | #endif |
| 208 | if (!IN6_IS_ADDR_MULTICAST(&daddr6)) |
| 209 | tlladdr = 0; |
| 210 | else |
| 211 | tlladdr = 1; |
| 212 | |
| 213 | /* |
| 214 | * Target address (taddr6) must be either: |
| 215 | * (1) Valid unicast/anycast address for my receiving interface, |
| 216 | * (2) Unicast address for which I'm offering proxy service, or |
| 217 | * (3) "tentative" address on which DAD is being performed. |
| 218 | */ |
| 219 | /* (1) and (3) check. */ |
| 220 | #if NCARP > 0 |
| 221 | if (ifp->if_carp && ifp->if_type != IFT_CARP) { |
| 222 | int s = pserialize_read_enter(); |
| 223 | ifa = carp_iamatch6(ifp->if_carp, &taddr6); |
| 224 | if (ifa != NULL) |
| 225 | ifa_acquire(ifa, &psref_ia); |
| 226 | pserialize_read_exit(s); |
| 227 | } else |
| 228 | ifa = NULL; |
| 229 | if (!ifa) |
| 230 | ifa = (struct ifaddr *)in6ifa_ifpwithaddr_psref(ifp, &taddr6, |
| 231 | &psref_ia); |
| 232 | #else |
| 233 | ifa = (struct ifaddr *)in6ifa_ifpwithaddr_psref(ifp, &taddr6, |
| 234 | &psref_ia); |
| 235 | #endif |
| 236 | |
| 237 | /* (2) check. */ |
| 238 | if (ifa == NULL) { |
| 239 | struct rtentry *rt; |
| 240 | struct sockaddr_in6 tsin6; |
| 241 | |
| 242 | sockaddr_in6_init(&tsin6, &taddr6, 0, 0, 0); |
| 243 | |
| 244 | rt = rtalloc1(sin6tosa(&tsin6), 0); |
| 245 | if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && |
| 246 | rt->rt_gateway->sa_family == AF_LINK) { |
| 247 | /* |
| 248 | * proxy NDP for single entry |
| 249 | */ |
| 250 | ifa = (struct ifaddr *)in6ifa_ifpforlinklocal_psref(ifp, |
| 251 | IN6_IFF_NOTREADY|IN6_IFF_ANYCAST, &psref_ia); |
| 252 | if (ifa) { |
| 253 | proxy = 1; |
| 254 | proxydl = satocsdl(rt->rt_gateway); |
| 255 | router = 0; /* XXX */ |
| 256 | } |
| 257 | } |
| 258 | if (rt) |
| 259 | rtfree(rt); |
| 260 | } |
| 261 | if (ifa == NULL) { |
| 262 | /* |
| 263 | * We've got an NS packet, and we don't have that address |
| 264 | * assigned for us. We MUST silently ignore it. |
| 265 | * See RFC2461 7.2.3. |
| 266 | */ |
| 267 | goto freeit; |
| 268 | } |
| 269 | myaddr6 = *IFA_IN6(ifa); |
| 270 | anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; |
| 271 | tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; |
| 272 | if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) |
| 273 | goto freeit; |
| 274 | |
| 275 | if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { |
| 276 | nd6log(LOG_INFO, "lladdrlen mismatch for %s " |
| 277 | "(if %d, NS packet %d)\n" , |
| 278 | ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2); |
| 279 | goto bad; |
| 280 | } |
| 281 | |
| 282 | if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { |
| 283 | nd6log(LOG_INFO, "duplicate IP6 address %s\n" , |
| 284 | ip6_sprintf(&saddr6)); |
| 285 | goto freeit; |
| 286 | } |
| 287 | |
| 288 | /* |
| 289 | * We have neighbor solicitation packet, with target address equals to |
| 290 | * one of my tentative address. |
| 291 | * |
| 292 | * src addr how to process? |
| 293 | * --- --- |
| 294 | * multicast of course, invalid (rejected in ip6_input) |
| 295 | * unicast somebody is doing address resolution -> ignore |
| 296 | * unspec dup address detection |
| 297 | * |
| 298 | * The processing is defined in RFC 2462. |
| 299 | */ |
| 300 | if (tentative) { |
| 301 | /* |
| 302 | * If source address is unspecified address, it is for |
| 303 | * duplicate address detection. |
| 304 | * |
| 305 | * If not, the packet is for addess resolution; |
| 306 | * silently ignore it. |
| 307 | */ |
| 308 | if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) |
| 309 | nd6_dad_ns_input(ifa); |
| 310 | ifa_release(ifa, &psref_ia); |
| 311 | ifa = NULL; |
| 312 | |
| 313 | goto freeit; |
| 314 | } |
| 315 | ifa_release(ifa, &psref_ia); |
| 316 | ifa = NULL; |
| 317 | |
| 318 | /* |
| 319 | * If the source address is unspecified address, entries must not |
| 320 | * be created or updated. |
| 321 | * It looks that sender is performing DAD. Output NA toward |
| 322 | * all-node multicast address, to tell the sender that I'm using |
| 323 | * the address. |
| 324 | * S bit ("solicited") must be zero. |
| 325 | */ |
| 326 | if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { |
| 327 | struct in6_addr in6_all; |
| 328 | |
| 329 | in6_all = in6addr_linklocal_allnodes; |
| 330 | if (in6_setscope(&in6_all, ifp, NULL) != 0) |
| 331 | goto bad; |
| 332 | nd6_na_output(ifp, &in6_all, &taddr6, |
| 333 | ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | |
| 334 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), |
| 335 | tlladdr, (const struct sockaddr *)proxydl); |
| 336 | goto freeit; |
| 337 | } |
| 338 | |
| 339 | nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0); |
| 340 | |
| 341 | nd6_na_output(ifp, &saddr6, &taddr6, |
| 342 | ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | |
| 343 | (router ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED, |
| 344 | tlladdr, (const struct sockaddr *)proxydl); |
| 345 | freeit: |
| 346 | ifa_release(ifa, &psref_ia); |
| 347 | m_put_rcvif_psref(ifp, &psref); |
| 348 | m_freem(m); |
| 349 | return; |
| 350 | |
| 351 | bad: |
| 352 | nd6log(LOG_ERR, "src=%s\n" , ip6_sprintf(&saddr6)); |
| 353 | nd6log(LOG_ERR, "dst=%s\n" , ip6_sprintf(&daddr6)); |
| 354 | nd6log(LOG_ERR, "tgt=%s\n" , ip6_sprintf(&taddr6)); |
| 355 | ICMP6_STATINC(ICMP6_STAT_BADNS); |
| 356 | ifa_release(ifa, &psref_ia); |
| 357 | m_put_rcvif_psref(ifp, &psref); |
| 358 | m_freem(m); |
| 359 | } |
| 360 | |
| 361 | /* |
| 362 | * Output a Neighbor Solicitation Message. Caller specifies: |
| 363 | * - ICMP6 header source IP6 address |
| 364 | * - ND6 header target IP6 address |
| 365 | * - ND6 header source datalink address |
| 366 | * |
| 367 | * Based on RFC 2461 |
| 368 | * Based on RFC 2462 (duplicate address detection) |
| 369 | */ |
| 370 | void |
| 371 | nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6, |
| 372 | const struct in6_addr *taddr6, |
| 373 | struct in6_addr *hsrc, |
| 374 | int dad /* duplicate address detection */) |
| 375 | { |
| 376 | struct mbuf *m; |
| 377 | struct ip6_hdr *ip6; |
| 378 | struct nd_neighbor_solicit *nd_ns; |
| 379 | struct in6_addr *src, src_in; |
| 380 | struct ip6_moptions im6o; |
| 381 | int icmp6len; |
| 382 | int maxlen; |
| 383 | const void *mac; |
| 384 | struct route ro; |
| 385 | |
| 386 | if (IN6_IS_ADDR_MULTICAST(taddr6)) |
| 387 | return; |
| 388 | |
| 389 | memset(&ro, 0, sizeof(ro)); |
| 390 | |
| 391 | /* estimate the size of message */ |
| 392 | maxlen = sizeof(*ip6) + sizeof(*nd_ns); |
| 393 | maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; |
| 394 | #ifdef DIAGNOSTIC |
| 395 | if (max_linkhdr + maxlen >= MCLBYTES) { |
| 396 | printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " |
| 397 | "(%d + %d > %d)\n" , max_linkhdr, maxlen, MCLBYTES); |
| 398 | panic("nd6_ns_output: insufficient MCLBYTES" ); |
| 399 | /* NOTREACHED */ |
| 400 | } |
| 401 | #endif |
| 402 | |
| 403 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
| 404 | if (m && max_linkhdr + maxlen >= MHLEN) { |
| 405 | MCLGET(m, M_DONTWAIT); |
| 406 | if ((m->m_flags & M_EXT) == 0) { |
| 407 | m_free(m); |
| 408 | m = NULL; |
| 409 | } |
| 410 | } |
| 411 | if (m == NULL) |
| 412 | return; |
| 413 | m_reset_rcvif(m); |
| 414 | |
| 415 | if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { |
| 416 | m->m_flags |= M_MCAST; |
| 417 | im6o.im6o_multicast_if_index = if_get_index(ifp); |
| 418 | im6o.im6o_multicast_hlim = 255; |
| 419 | im6o.im6o_multicast_loop = 0; |
| 420 | } |
| 421 | |
| 422 | icmp6len = sizeof(*nd_ns); |
| 423 | m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; |
| 424 | m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ |
| 425 | |
| 426 | /* fill neighbor solicitation packet */ |
| 427 | ip6 = mtod(m, struct ip6_hdr *); |
| 428 | ip6->ip6_flow = 0; |
| 429 | ip6->ip6_vfc &= ~IPV6_VERSION_MASK; |
| 430 | ip6->ip6_vfc |= IPV6_VERSION; |
| 431 | /* ip6->ip6_plen will be set later */ |
| 432 | ip6->ip6_nxt = IPPROTO_ICMPV6; |
| 433 | ip6->ip6_hlim = 255; |
| 434 | if (daddr6) |
| 435 | ip6->ip6_dst = *daddr6; |
| 436 | else { |
| 437 | ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; |
| 438 | ip6->ip6_dst.s6_addr16[1] = 0; |
| 439 | ip6->ip6_dst.s6_addr32[1] = 0; |
| 440 | ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; |
| 441 | ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; |
| 442 | ip6->ip6_dst.s6_addr8[12] = 0xff; |
| 443 | if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) |
| 444 | goto bad; |
| 445 | } |
| 446 | if (!dad) { |
| 447 | int s; |
| 448 | /* |
| 449 | * RFC2461 7.2.2: |
| 450 | * "If the source address of the packet prompting the |
| 451 | * solicitation is the same as one of the addresses assigned |
| 452 | * to the outgoing interface, that address SHOULD be placed |
| 453 | * in the IP Source Address of the outgoing solicitation. |
| 454 | * Otherwise, any one of the addresses assigned to the |
| 455 | * interface should be used." |
| 456 | * |
| 457 | * We use the source address for the prompting packet |
| 458 | * (hsrc), if: |
| 459 | * - hsrc is given from the caller (by giving "ln"), and |
| 460 | * - hsrc belongs to the outgoing interface. |
| 461 | * Otherwise, we perform the source address selection as usual. |
| 462 | */ |
| 463 | s = pserialize_read_enter(); |
| 464 | if (hsrc && in6ifa_ifpwithaddr(ifp, hsrc)) |
| 465 | src = hsrc; |
| 466 | else { |
| 467 | int error; |
| 468 | struct sockaddr_in6 dst_sa; |
| 469 | |
| 470 | sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0); |
| 471 | |
| 472 | error = in6_selectsrc(&dst_sa, NULL, |
| 473 | NULL, &ro, NULL, NULL, NULL, &src_in); |
| 474 | if (error != 0) { |
| 475 | nd6log(LOG_DEBUG, "source can't be " |
| 476 | "determined: dst=%s, error=%d\n" , |
| 477 | ip6_sprintf(&dst_sa.sin6_addr), error); |
| 478 | pserialize_read_exit(s); |
| 479 | goto bad; |
| 480 | } |
| 481 | src = &src_in; |
| 482 | } |
| 483 | pserialize_read_exit(s); |
| 484 | } else { |
| 485 | /* |
| 486 | * Source address for DAD packet must always be IPv6 |
| 487 | * unspecified address. (0::0) |
| 488 | * We actually don't have to 0-clear the address (we did it |
| 489 | * above), but we do so here explicitly to make the intention |
| 490 | * clearer. |
| 491 | */ |
| 492 | memset(&src_in, 0, sizeof(src_in)); |
| 493 | src = &src_in; |
| 494 | } |
| 495 | ip6->ip6_src = *src; |
| 496 | nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); |
| 497 | nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; |
| 498 | nd_ns->nd_ns_code = 0; |
| 499 | nd_ns->nd_ns_reserved = 0; |
| 500 | nd_ns->nd_ns_target = *taddr6; |
| 501 | in6_clearscope(&nd_ns->nd_ns_target); /* XXX */ |
| 502 | |
| 503 | /* |
| 504 | * Add source link-layer address option. |
| 505 | * |
| 506 | * spec implementation |
| 507 | * --- --- |
| 508 | * DAD packet MUST NOT do not add the option |
| 509 | * there's no link layer address: |
| 510 | * impossible do not add the option |
| 511 | * there's link layer address: |
| 512 | * Multicast NS MUST add one add the option |
| 513 | * Unicast NS SHOULD add one add the option |
| 514 | */ |
| 515 | if (!dad && (mac = nd6_ifptomac(ifp))) { |
| 516 | int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; |
| 517 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); |
| 518 | /* 8 byte alignments... */ |
| 519 | optlen = (optlen + 7) & ~7; |
| 520 | |
| 521 | m->m_pkthdr.len += optlen; |
| 522 | m->m_len += optlen; |
| 523 | icmp6len += optlen; |
| 524 | memset((void *)nd_opt, 0, optlen); |
| 525 | nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; |
| 526 | nd_opt->nd_opt_len = optlen >> 3; |
| 527 | memcpy((void *)(nd_opt + 1), mac, ifp->if_addrlen); |
| 528 | } |
| 529 | |
| 530 | ip6->ip6_plen = htons((u_int16_t)icmp6len); |
| 531 | nd_ns->nd_ns_cksum = 0; |
| 532 | nd_ns->nd_ns_cksum = |
| 533 | in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); |
| 534 | |
| 535 | ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL); |
| 536 | icmp6_ifstat_inc(ifp, ifs6_out_msg); |
| 537 | icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); |
| 538 | ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_NEIGHBOR_SOLICIT); |
| 539 | |
| 540 | rtcache_free(&ro); |
| 541 | return; |
| 542 | |
| 543 | bad: |
| 544 | rtcache_free(&ro); |
| 545 | m_freem(m); |
| 546 | return; |
| 547 | } |
| 548 | |
| 549 | /* |
| 550 | * Neighbor advertisement input handling. |
| 551 | * |
| 552 | * Based on RFC 2461 |
| 553 | * Based on RFC 2462 (duplicate address detection) |
| 554 | * |
| 555 | * the following items are not implemented yet: |
| 556 | * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) |
| 557 | * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) |
| 558 | */ |
| 559 | void |
| 560 | nd6_na_input(struct mbuf *m, int off, int icmp6len) |
| 561 | { |
| 562 | struct ifnet *ifp; |
| 563 | struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); |
| 564 | struct nd_neighbor_advert *nd_na; |
| 565 | struct in6_addr saddr6 = ip6->ip6_src; |
| 566 | struct in6_addr daddr6 = ip6->ip6_dst; |
| 567 | struct in6_addr taddr6; |
| 568 | int flags; |
| 569 | int is_router; |
| 570 | int is_solicited; |
| 571 | int is_override; |
| 572 | char *lladdr = NULL; |
| 573 | int lladdrlen = 0; |
| 574 | struct ifaddr *ifa; |
| 575 | struct llentry *ln = NULL; |
| 576 | union nd_opts ndopts; |
| 577 | struct sockaddr_in6 ssin6; |
| 578 | int rt_announce; |
| 579 | bool checklink = false; |
| 580 | struct psref psref; |
| 581 | struct psref psref_ia; |
| 582 | |
| 583 | ifp = m_get_rcvif_psref(m, &psref); |
| 584 | if (ifp == NULL) |
| 585 | goto freeit; |
| 586 | |
| 587 | if (ip6->ip6_hlim != 255) { |
| 588 | nd6log(LOG_ERR, |
| 589 | "invalid hlim (%d) from %s to %s on %s\n" , |
| 590 | ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), |
| 591 | ip6_sprintf(&ip6->ip6_dst), if_name(ifp)); |
| 592 | goto bad; |
| 593 | } |
| 594 | |
| 595 | IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); |
| 596 | if (nd_na == NULL) { |
| 597 | m_put_rcvif_psref(ifp, &psref); |
| 598 | ICMP6_STATINC(ICMP6_STAT_TOOSHORT); |
| 599 | return; |
| 600 | } |
| 601 | |
| 602 | flags = nd_na->nd_na_flags_reserved; |
| 603 | is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); |
| 604 | is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); |
| 605 | is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); |
| 606 | |
| 607 | taddr6 = nd_na->nd_na_target; |
| 608 | if (in6_setscope(&taddr6, ifp, NULL)) { |
| 609 | m_put_rcvif_psref(ifp, &psref); |
| 610 | return; /* XXX: impossible */ |
| 611 | } |
| 612 | |
| 613 | if (IN6_IS_ADDR_MULTICAST(&taddr6)) { |
| 614 | nd6log(LOG_ERR, "invalid target address %s\n" , |
| 615 | ip6_sprintf(&taddr6)); |
| 616 | goto bad; |
| 617 | } |
| 618 | if (is_solicited && IN6_IS_ADDR_MULTICAST(&daddr6)) { |
| 619 | nd6log(LOG_ERR, "a solicited adv is multicasted\n" ); |
| 620 | goto bad; |
| 621 | } |
| 622 | |
| 623 | icmp6len -= sizeof(*nd_na); |
| 624 | nd6_option_init(nd_na + 1, icmp6len, &ndopts); |
| 625 | if (nd6_options(&ndopts) < 0) { |
| 626 | nd6log(LOG_INFO, "invalid ND option, ignored\n" ); |
| 627 | /* nd6_options have incremented stats */ |
| 628 | goto freeit; |
| 629 | } |
| 630 | |
| 631 | if (ndopts.nd_opts_tgt_lladdr) { |
| 632 | lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); |
| 633 | lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; |
| 634 | } |
| 635 | |
| 636 | ifa = (struct ifaddr *)in6ifa_ifpwithaddr_psref(ifp, &taddr6, &psref_ia); |
| 637 | |
| 638 | /* |
| 639 | * Target address matches one of my interface address. |
| 640 | * |
| 641 | * If my address is tentative, this means that there's somebody |
| 642 | * already using the same address as mine. This indicates DAD failure. |
| 643 | * This is defined in RFC 2462. |
| 644 | * |
| 645 | * Otherwise, process as defined in RFC 2461. |
| 646 | */ |
| 647 | if (ifa |
| 648 | && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { |
| 649 | nd6_dad_na_input(ifa); |
| 650 | ifa_release(ifa, &psref_ia); |
| 651 | ifa = NULL; |
| 652 | goto freeit; |
| 653 | } |
| 654 | |
| 655 | /* Just for safety, maybe unnecessary. */ |
| 656 | if (ifa) { |
| 657 | log(LOG_ERR, |
| 658 | "nd6_na_input: duplicate IP6 address %s\n" , |
| 659 | ip6_sprintf(&taddr6)); |
| 660 | ifa_release(ifa, &psref_ia); |
| 661 | ifa = NULL; |
| 662 | goto freeit; |
| 663 | } |
| 664 | |
| 665 | /* |
| 666 | * Make sure the source address is from a neighbor's address. |
| 667 | */ |
| 668 | sockaddr_in6_init(&ssin6, &saddr6, 0, 0, 0); |
| 669 | if (nd6_is_addr_neighbor(&ssin6, ifp) == 0) { |
| 670 | nd6log(LOG_INFO, "ND packet from non-neighbor %s on %s\n" , |
| 671 | ip6_sprintf(&saddr6), if_name(ifp)); |
| 672 | goto bad; |
| 673 | } |
| 674 | |
| 675 | if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { |
| 676 | nd6log(LOG_INFO, "lladdrlen mismatch for %s " |
| 677 | "(if %d, NA packet %d)\n" , ip6_sprintf(&taddr6), |
| 678 | ifp->if_addrlen, lladdrlen - 2); |
| 679 | goto bad; |
| 680 | } |
| 681 | |
| 682 | /* |
| 683 | * If no neighbor cache entry is found, NA SHOULD silently be |
| 684 | * discarded. |
| 685 | */ |
| 686 | ln = nd6_lookup(&taddr6, ifp, true); |
| 687 | if (ln == NULL) |
| 688 | goto freeit; |
| 689 | |
| 690 | rt_announce = 0; |
| 691 | if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { |
| 692 | /* |
| 693 | * If the link-layer has address, and no lladdr option came, |
| 694 | * discard the packet. |
| 695 | */ |
| 696 | if (ifp->if_addrlen && !lladdr) |
| 697 | goto freeit; |
| 698 | |
| 699 | /* |
| 700 | * Record link-layer address, and update the state. |
| 701 | */ |
| 702 | memcpy(&ln->ll_addr, lladdr, ifp->if_addrlen); |
| 703 | ln->la_flags |= LLE_VALID; |
| 704 | rt_announce = 1; |
| 705 | if (is_solicited) { |
| 706 | ln->ln_state = ND6_LLINFO_REACHABLE; |
| 707 | ln->ln_byhint = 0; |
| 708 | if (!ND6_LLINFO_PERMANENT(ln)) { |
| 709 | nd6_llinfo_settimer(ln, |
| 710 | ND_IFINFO(ln->lle_tbl->llt_ifp)->reachable * hz); |
| 711 | } |
| 712 | } else { |
| 713 | ln->ln_state = ND6_LLINFO_STALE; |
| 714 | nd6_llinfo_settimer(ln, nd6_gctimer * hz); |
| 715 | } |
| 716 | if ((ln->ln_router = is_router) != 0) { |
| 717 | /* |
| 718 | * This means a router's state has changed from |
| 719 | * non-reachable to probably reachable, and might |
| 720 | * affect the status of associated prefixes.. |
| 721 | */ |
| 722 | checklink = true; |
| 723 | } |
| 724 | } else { |
| 725 | int llchange; |
| 726 | |
| 727 | /* |
| 728 | * Check if the link-layer address has changed or not. |
| 729 | */ |
| 730 | if (lladdr == NULL) |
| 731 | llchange = 0; |
| 732 | else { |
| 733 | if (ln->la_flags & LLE_VALID) { |
| 734 | if (memcmp(lladdr, &ln->ll_addr, ifp->if_addrlen)) |
| 735 | llchange = rt_announce = 1; |
| 736 | else |
| 737 | llchange = 0; |
| 738 | } else |
| 739 | llchange = rt_announce = 1; |
| 740 | } |
| 741 | |
| 742 | /* |
| 743 | * This is VERY complex. Look at it with care. |
| 744 | * |
| 745 | * override solicit lladdr llchange action |
| 746 | * (L: record lladdr) |
| 747 | * |
| 748 | * 0 0 n -- (2c) |
| 749 | * 0 0 y n (2b) L |
| 750 | * 0 0 y y (1) REACHABLE->STALE |
| 751 | * 0 1 n -- (2c) *->REACHABLE |
| 752 | * 0 1 y n (2b) L *->REACHABLE |
| 753 | * 0 1 y y (1) REACHABLE->STALE |
| 754 | * 1 0 n -- (2a) |
| 755 | * 1 0 y n (2a) L |
| 756 | * 1 0 y y (2a) L *->STALE |
| 757 | * 1 1 n -- (2a) *->REACHABLE |
| 758 | * 1 1 y n (2a) L *->REACHABLE |
| 759 | * 1 1 y y (2a) L *->REACHABLE |
| 760 | */ |
| 761 | if (!is_override && lladdr != NULL && llchange) { /* (1) */ |
| 762 | /* |
| 763 | * If state is REACHABLE, make it STALE. |
| 764 | * no other updates should be done. |
| 765 | */ |
| 766 | if (ln->ln_state == ND6_LLINFO_REACHABLE) { |
| 767 | ln->ln_state = ND6_LLINFO_STALE; |
| 768 | nd6_llinfo_settimer(ln, nd6_gctimer * hz); |
| 769 | } |
| 770 | goto freeit; |
| 771 | } else if (is_override /* (2a) */ |
| 772 | || (!is_override && lladdr != NULL && !llchange) /* (2b) */ |
| 773 | || lladdr == NULL) { /* (2c) */ |
| 774 | /* |
| 775 | * Update link-local address, if any. |
| 776 | */ |
| 777 | if (lladdr != NULL) { |
| 778 | memcpy(&ln->ll_addr, lladdr, ifp->if_addrlen); |
| 779 | ln->la_flags |= LLE_VALID; |
| 780 | } |
| 781 | |
| 782 | /* |
| 783 | * If solicited, make the state REACHABLE. |
| 784 | * If not solicited and the link-layer address was |
| 785 | * changed, make it STALE. |
| 786 | */ |
| 787 | if (is_solicited) { |
| 788 | ln->ln_state = ND6_LLINFO_REACHABLE; |
| 789 | ln->ln_byhint = 0; |
| 790 | if (!ND6_LLINFO_PERMANENT(ln)) { |
| 791 | nd6_llinfo_settimer(ln, |
| 792 | ND_IFINFO(ifp)->reachable * hz); |
| 793 | } |
| 794 | } else { |
| 795 | if (lladdr && llchange) { |
| 796 | ln->ln_state = ND6_LLINFO_STALE; |
| 797 | nd6_llinfo_settimer(ln, |
| 798 | nd6_gctimer * hz); |
| 799 | } |
| 800 | } |
| 801 | } |
| 802 | |
| 803 | if (ln->ln_router && !is_router) { |
| 804 | /* |
| 805 | * The peer dropped the router flag. |
| 806 | * Remove the sender from the Default Router List and |
| 807 | * update the Destination Cache entries. |
| 808 | */ |
| 809 | struct nd_defrouter *dr; |
| 810 | const struct in6_addr *in6; |
| 811 | int s; |
| 812 | |
| 813 | in6 = &ln->r_l3addr.addr6; |
| 814 | |
| 815 | /* |
| 816 | * Lock to protect the default router list. |
| 817 | * XXX: this might be unnecessary, since this function |
| 818 | * is only called under the network software interrupt |
| 819 | * context. However, we keep it just for safety. |
| 820 | */ |
| 821 | s = splsoftnet(); |
| 822 | dr = defrouter_lookup(in6, ln->lle_tbl->llt_ifp); |
| 823 | if (dr) |
| 824 | defrtrlist_del(dr, NULL); |
| 825 | else if (!ip6_forwarding) { |
| 826 | /* |
| 827 | * Even if the neighbor is not in the default |
| 828 | * router list, the neighbor may be used |
| 829 | * as a next hop for some destinations |
| 830 | * (e.g. redirect case). So we must |
| 831 | * call rt6_flush explicitly. |
| 832 | */ |
| 833 | rt6_flush(&ip6->ip6_src, ln->lle_tbl->llt_ifp); |
| 834 | } |
| 835 | splx(s); |
| 836 | } |
| 837 | ln->ln_router = is_router; |
| 838 | } |
| 839 | /* |
| 840 | * XXX: does this matter? |
| 841 | * rt->rt_flags &= ~RTF_REJECT; |
| 842 | */ |
| 843 | ln->ln_asked = 0; |
| 844 | nd6_llinfo_release_pkts(ln, ifp); |
| 845 | /* FIXME */ |
| 846 | #if 0 |
| 847 | if (rt_announce) /* tell user process about any new lladdr */ |
| 848 | rt_newmsg(RTM_CHANGE, rt); |
| 849 | #endif |
| 850 | |
| 851 | freeit: |
| 852 | if (ln != NULL) |
| 853 | LLE_WUNLOCK(ln); |
| 854 | |
| 855 | if (checklink) |
| 856 | pfxlist_onlink_check(); |
| 857 | |
| 858 | m_put_rcvif_psref(ifp, &psref); |
| 859 | m_freem(m); |
| 860 | return; |
| 861 | |
| 862 | bad: |
| 863 | if (ln != NULL) |
| 864 | LLE_WUNLOCK(ln); |
| 865 | |
| 866 | ICMP6_STATINC(ICMP6_STAT_BADNA); |
| 867 | m_put_rcvif_psref(ifp, &psref); |
| 868 | m_freem(m); |
| 869 | } |
| 870 | |
| 871 | /* |
| 872 | * Neighbor advertisement output handling. |
| 873 | * |
| 874 | * Based on RFC 2461 |
| 875 | * |
| 876 | * the following items are not implemented yet: |
| 877 | * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) |
| 878 | * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) |
| 879 | */ |
| 880 | void |
| 881 | nd6_na_output( |
| 882 | struct ifnet *ifp, |
| 883 | const struct in6_addr *daddr6_0, |
| 884 | const struct in6_addr *taddr6, |
| 885 | u_long flags, |
| 886 | int tlladdr, /* 1 if include target link-layer address */ |
| 887 | const struct sockaddr *sdl0) /* sockaddr_dl (= proxy NA) or NULL */ |
| 888 | { |
| 889 | struct mbuf *m; |
| 890 | struct ip6_hdr *ip6; |
| 891 | struct nd_neighbor_advert *nd_na; |
| 892 | struct ip6_moptions im6o; |
| 893 | struct sockaddr *dst; |
| 894 | union { |
| 895 | struct sockaddr dst; |
| 896 | struct sockaddr_in6 dst6; |
| 897 | } u; |
| 898 | struct in6_addr daddr6; |
| 899 | int icmp6len, maxlen, error; |
| 900 | const void *mac; |
| 901 | struct route ro; |
| 902 | |
| 903 | mac = NULL; |
| 904 | memset(&ro, 0, sizeof(ro)); |
| 905 | |
| 906 | daddr6 = *daddr6_0; /* make a local copy for modification */ |
| 907 | |
| 908 | /* estimate the size of message */ |
| 909 | maxlen = sizeof(*ip6) + sizeof(*nd_na); |
| 910 | maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; |
| 911 | #ifdef DIAGNOSTIC |
| 912 | if (max_linkhdr + maxlen >= MCLBYTES) { |
| 913 | printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " |
| 914 | "(%d + %d > %d)\n" , max_linkhdr, maxlen, MCLBYTES); |
| 915 | panic("nd6_na_output: insufficient MCLBYTES" ); |
| 916 | /* NOTREACHED */ |
| 917 | } |
| 918 | #endif |
| 919 | |
| 920 | MGETHDR(m, M_DONTWAIT, MT_DATA); |
| 921 | if (m && max_linkhdr + maxlen >= MHLEN) { |
| 922 | MCLGET(m, M_DONTWAIT); |
| 923 | if ((m->m_flags & M_EXT) == 0) { |
| 924 | m_free(m); |
| 925 | m = NULL; |
| 926 | } |
| 927 | } |
| 928 | if (m == NULL) |
| 929 | return; |
| 930 | m_reset_rcvif(m); |
| 931 | |
| 932 | if (IN6_IS_ADDR_MULTICAST(&daddr6)) { |
| 933 | m->m_flags |= M_MCAST; |
| 934 | im6o.im6o_multicast_if_index = if_get_index(ifp); |
| 935 | im6o.im6o_multicast_hlim = 255; |
| 936 | im6o.im6o_multicast_loop = 0; |
| 937 | } |
| 938 | |
| 939 | icmp6len = sizeof(*nd_na); |
| 940 | m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; |
| 941 | m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ |
| 942 | |
| 943 | /* fill neighbor advertisement packet */ |
| 944 | ip6 = mtod(m, struct ip6_hdr *); |
| 945 | ip6->ip6_flow = 0; |
| 946 | ip6->ip6_vfc &= ~IPV6_VERSION_MASK; |
| 947 | ip6->ip6_vfc |= IPV6_VERSION; |
| 948 | ip6->ip6_nxt = IPPROTO_ICMPV6; |
| 949 | ip6->ip6_hlim = 255; |
| 950 | if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) { |
| 951 | /* reply to DAD */ |
| 952 | daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL; |
| 953 | daddr6.s6_addr16[1] = 0; |
| 954 | daddr6.s6_addr32[1] = 0; |
| 955 | daddr6.s6_addr32[2] = 0; |
| 956 | daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE; |
| 957 | if (in6_setscope(&daddr6, ifp, NULL)) |
| 958 | goto bad; |
| 959 | |
| 960 | flags &= ~ND_NA_FLAG_SOLICITED; |
| 961 | } |
| 962 | ip6->ip6_dst = daddr6; |
| 963 | sockaddr_in6_init(&u.dst6, &daddr6, 0, 0, 0); |
| 964 | dst = &u.dst; |
| 965 | if (rtcache_setdst(&ro, dst) != 0) |
| 966 | goto bad; |
| 967 | |
| 968 | /* |
| 969 | * Select a source whose scope is the same as that of the dest. |
| 970 | */ |
| 971 | error = in6_selectsrc(satosin6(dst), NULL, NULL, &ro, NULL, NULL, NULL, |
| 972 | &ip6->ip6_src); |
| 973 | if (error != 0) { |
| 974 | nd6log(LOG_DEBUG, "source can't be " |
| 975 | "determined: dst=%s, error=%d\n" , |
| 976 | ip6_sprintf(&satocsin6(dst)->sin6_addr), error); |
| 977 | goto bad; |
| 978 | } |
| 979 | nd_na = (struct nd_neighbor_advert *)(ip6 + 1); |
| 980 | nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; |
| 981 | nd_na->nd_na_code = 0; |
| 982 | nd_na->nd_na_target = *taddr6; |
| 983 | in6_clearscope(&nd_na->nd_na_target); /* XXX */ |
| 984 | |
| 985 | /* |
| 986 | * "tlladdr" indicates NS's condition for adding tlladdr or not. |
| 987 | * see nd6_ns_input() for details. |
| 988 | * Basically, if NS packet is sent to unicast/anycast addr, |
| 989 | * target lladdr option SHOULD NOT be included. |
| 990 | */ |
| 991 | if (tlladdr) { |
| 992 | /* |
| 993 | * sdl0 != NULL indicates proxy NA. If we do proxy, use |
| 994 | * lladdr in sdl0. If we are not proxying (sending NA for |
| 995 | * my address) use lladdr configured for the interface. |
| 996 | */ |
| 997 | if (sdl0 == NULL) |
| 998 | mac = nd6_ifptomac(ifp); |
| 999 | else if (sdl0->sa_family == AF_LINK) { |
| 1000 | const struct sockaddr_dl *sdl; |
| 1001 | sdl = satocsdl(sdl0); |
| 1002 | if (sdl->sdl_alen == ifp->if_addrlen) |
| 1003 | mac = CLLADDR(sdl); |
| 1004 | } |
| 1005 | } |
| 1006 | if (tlladdr && mac) { |
| 1007 | int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; |
| 1008 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); |
| 1009 | |
| 1010 | /* roundup to 8 bytes alignment! */ |
| 1011 | optlen = (optlen + 7) & ~7; |
| 1012 | |
| 1013 | m->m_pkthdr.len += optlen; |
| 1014 | m->m_len += optlen; |
| 1015 | icmp6len += optlen; |
| 1016 | memset((void *)nd_opt, 0, optlen); |
| 1017 | nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; |
| 1018 | nd_opt->nd_opt_len = optlen >> 3; |
| 1019 | memcpy((void *)(nd_opt + 1), mac, ifp->if_addrlen); |
| 1020 | } else |
| 1021 | flags &= ~ND_NA_FLAG_OVERRIDE; |
| 1022 | |
| 1023 | ip6->ip6_plen = htons((u_int16_t)icmp6len); |
| 1024 | nd_na->nd_na_flags_reserved = flags; |
| 1025 | nd_na->nd_na_cksum = 0; |
| 1026 | nd_na->nd_na_cksum = |
| 1027 | in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); |
| 1028 | |
| 1029 | ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL); |
| 1030 | |
| 1031 | icmp6_ifstat_inc(ifp, ifs6_out_msg); |
| 1032 | icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); |
| 1033 | ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_NEIGHBOR_ADVERT); |
| 1034 | |
| 1035 | rtcache_free(&ro); |
| 1036 | return; |
| 1037 | |
| 1038 | bad: |
| 1039 | rtcache_free(&ro); |
| 1040 | m_freem(m); |
| 1041 | return; |
| 1042 | } |
| 1043 | |
| 1044 | const void * |
| 1045 | nd6_ifptomac(const struct ifnet *ifp) |
| 1046 | { |
| 1047 | switch (ifp->if_type) { |
| 1048 | case IFT_ARCNET: |
| 1049 | case IFT_ETHER: |
| 1050 | case IFT_FDDI: |
| 1051 | case IFT_IEEE1394: |
| 1052 | case IFT_PROPVIRTUAL: |
| 1053 | case IFT_CARP: |
| 1054 | case IFT_L2VLAN: |
| 1055 | case IFT_IEEE80211: |
| 1056 | return CLLADDR(ifp->if_sadl); |
| 1057 | default: |
| 1058 | return NULL; |
| 1059 | } |
| 1060 | } |
| 1061 | |
| 1062 | TAILQ_HEAD(dadq_head, dadq); |
| 1063 | struct dadq { |
| 1064 | TAILQ_ENTRY(dadq) dad_list; |
| 1065 | struct ifaddr *dad_ifa; |
| 1066 | int dad_count; /* max NS to send */ |
| 1067 | int dad_ns_tcount; /* # of trials to send NS */ |
| 1068 | int dad_ns_ocount; /* NS sent so far */ |
| 1069 | int dad_ns_icount; |
| 1070 | int dad_na_icount; |
| 1071 | struct callout dad_timer_ch; |
| 1072 | }; |
| 1073 | |
| 1074 | static struct dadq_head dadq; |
| 1075 | static int dad_init = 0; |
| 1076 | static kmutex_t nd6_dad_lock; |
| 1077 | |
| 1078 | static struct dadq * |
| 1079 | nd6_dad_find(struct ifaddr *ifa) |
| 1080 | { |
| 1081 | struct dadq *dp; |
| 1082 | |
| 1083 | KASSERT(mutex_owned(&nd6_dad_lock)); |
| 1084 | |
| 1085 | TAILQ_FOREACH(dp, &dadq, dad_list) { |
| 1086 | if (dp->dad_ifa == ifa) |
| 1087 | return dp; |
| 1088 | } |
| 1089 | return NULL; |
| 1090 | } |
| 1091 | |
| 1092 | static void |
| 1093 | nd6_dad_starttimer(struct dadq *dp, int ticks) |
| 1094 | { |
| 1095 | |
| 1096 | callout_reset(&dp->dad_timer_ch, ticks, |
| 1097 | (void (*)(void *))nd6_dad_timer, (void *)dp->dad_ifa); |
| 1098 | } |
| 1099 | |
| 1100 | static void |
| 1101 | nd6_dad_stoptimer(struct dadq *dp) |
| 1102 | { |
| 1103 | |
| 1104 | #ifdef NET_MPSAFE |
| 1105 | callout_halt(&dp->dad_timer_ch, NULL); |
| 1106 | #else |
| 1107 | callout_halt(&dp->dad_timer_ch, softnet_lock); |
| 1108 | #endif |
| 1109 | } |
| 1110 | |
| 1111 | /* |
| 1112 | * Start Duplicate Address Detection (DAD) for specified interface address. |
| 1113 | * |
| 1114 | * Note that callout is used when xtick > 0 and not when xtick == 0. |
| 1115 | * |
| 1116 | * xtick: minimum delay ticks for IFF_UP event |
| 1117 | */ |
| 1118 | void |
| 1119 | nd6_dad_start(struct ifaddr *ifa, int xtick) |
| 1120 | { |
| 1121 | struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; |
| 1122 | struct dadq *dp; |
| 1123 | |
| 1124 | if (!dad_init) { |
| 1125 | TAILQ_INIT(&dadq); |
| 1126 | mutex_init(&nd6_dad_lock, MUTEX_DEFAULT, IPL_NONE); |
| 1127 | dad_init++; |
| 1128 | } |
| 1129 | |
| 1130 | /* |
| 1131 | * If we don't need DAD, don't do it. |
| 1132 | * There are several cases: |
| 1133 | * - DAD is disabled (ip6_dad_count == 0) |
| 1134 | * - the interface address is anycast |
| 1135 | */ |
| 1136 | if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { |
| 1137 | log(LOG_DEBUG, |
| 1138 | "nd6_dad_start: called with non-tentative address " |
| 1139 | "%s(%s)\n" , |
| 1140 | ip6_sprintf(&ia->ia_addr.sin6_addr), |
| 1141 | ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???" ); |
| 1142 | return; |
| 1143 | } |
| 1144 | if (ia->ia6_flags & IN6_IFF_ANYCAST || !ip6_dad_count) { |
| 1145 | ia->ia6_flags &= ~IN6_IFF_TENTATIVE; |
| 1146 | rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); |
| 1147 | return; |
| 1148 | } |
| 1149 | KASSERT(ifa->ifa_ifp != NULL); |
| 1150 | if (!(ifa->ifa_ifp->if_flags & IFF_UP)) |
| 1151 | return; |
| 1152 | |
| 1153 | mutex_enter(&nd6_dad_lock); |
| 1154 | if (nd6_dad_find(ifa) != NULL) { |
| 1155 | mutex_exit(&nd6_dad_lock); |
| 1156 | /* DAD already in progress */ |
| 1157 | return; |
| 1158 | } |
| 1159 | |
| 1160 | dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); |
| 1161 | if (dp == NULL) { |
| 1162 | mutex_exit(&nd6_dad_lock); |
| 1163 | log(LOG_ERR, "nd6_dad_start: memory allocation failed for " |
| 1164 | "%s(%s)\n" , |
| 1165 | ip6_sprintf(&ia->ia_addr.sin6_addr), |
| 1166 | ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???" ); |
| 1167 | return; |
| 1168 | } |
| 1169 | memset(dp, 0, sizeof(*dp)); |
| 1170 | callout_init(&dp->dad_timer_ch, CALLOUT_MPSAFE); |
| 1171 | |
| 1172 | /* |
| 1173 | * Send NS packet for DAD, ip6_dad_count times. |
| 1174 | * Note that we must delay the first transmission, if this is the |
| 1175 | * first packet to be sent from the interface after interface |
| 1176 | * (re)initialization. |
| 1177 | */ |
| 1178 | dp->dad_ifa = ifa; |
| 1179 | ifaref(ifa); /* just for safety */ |
| 1180 | dp->dad_count = ip6_dad_count; |
| 1181 | dp->dad_ns_icount = dp->dad_na_icount = 0; |
| 1182 | dp->dad_ns_ocount = dp->dad_ns_tcount = 0; |
| 1183 | TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); |
| 1184 | |
| 1185 | nd6log(LOG_DEBUG, "%s: starting DAD for %s\n" , if_name(ifa->ifa_ifp), |
| 1186 | ip6_sprintf(&ia->ia_addr.sin6_addr)); |
| 1187 | |
| 1188 | if (xtick == 0) { |
| 1189 | nd6_dad_ns_output(dp, ifa); |
| 1190 | nd6_dad_starttimer(dp, |
| 1191 | (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); |
| 1192 | } else |
| 1193 | nd6_dad_starttimer(dp, xtick); |
| 1194 | mutex_exit(&nd6_dad_lock); |
| 1195 | } |
| 1196 | |
| 1197 | /* |
| 1198 | * terminate DAD unconditionally. used for address removals. |
| 1199 | */ |
| 1200 | void |
| 1201 | nd6_dad_stop(struct ifaddr *ifa) |
| 1202 | { |
| 1203 | struct dadq *dp; |
| 1204 | |
| 1205 | if (!dad_init) |
| 1206 | return; |
| 1207 | |
| 1208 | mutex_enter(&nd6_dad_lock); |
| 1209 | dp = nd6_dad_find(ifa); |
| 1210 | if (dp == NULL) { |
| 1211 | mutex_exit(&nd6_dad_lock); |
| 1212 | /* DAD wasn't started yet */ |
| 1213 | return; |
| 1214 | } |
| 1215 | |
| 1216 | /* Prevent the timer from running anymore. */ |
| 1217 | TAILQ_REMOVE(&dadq, dp, dad_list); |
| 1218 | mutex_exit(&nd6_dad_lock); |
| 1219 | |
| 1220 | nd6_dad_stoptimer(dp); |
| 1221 | |
| 1222 | free(dp, M_IP6NDP); |
| 1223 | dp = NULL; |
| 1224 | ifafree(ifa); |
| 1225 | } |
| 1226 | |
| 1227 | static void |
| 1228 | nd6_dad_timer(struct ifaddr *ifa) |
| 1229 | { |
| 1230 | struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; |
| 1231 | struct dadq *dp; |
| 1232 | int duplicate = 0; |
| 1233 | |
| 1234 | #ifndef NET_MPSAFE |
| 1235 | mutex_enter(softnet_lock); |
| 1236 | KERNEL_LOCK(1, NULL); |
| 1237 | #endif |
| 1238 | mutex_enter(&nd6_dad_lock); |
| 1239 | |
| 1240 | /* Sanity check */ |
| 1241 | if (ia == NULL) { |
| 1242 | log(LOG_ERR, "nd6_dad_timer: called with null parameter\n" ); |
| 1243 | goto done; |
| 1244 | } |
| 1245 | dp = nd6_dad_find(ifa); |
| 1246 | if (dp == NULL) { |
| 1247 | /* DAD seems to be stopping, so do nothing. */ |
| 1248 | goto done; |
| 1249 | } |
| 1250 | if (ia->ia6_flags & IN6_IFF_DUPLICATED) { |
| 1251 | log(LOG_ERR, "nd6_dad_timer: called with duplicate address " |
| 1252 | "%s(%s)\n" , |
| 1253 | ip6_sprintf(&ia->ia_addr.sin6_addr), |
| 1254 | ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???" ); |
| 1255 | goto done; |
| 1256 | } |
| 1257 | if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { |
| 1258 | log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " |
| 1259 | "%s(%s)\n" , |
| 1260 | ip6_sprintf(&ia->ia_addr.sin6_addr), |
| 1261 | ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???" ); |
| 1262 | goto done; |
| 1263 | } |
| 1264 | |
| 1265 | /* timeouted with IFF_{RUNNING,UP} check */ |
| 1266 | if (dp->dad_ns_tcount > dad_maxtry) { |
| 1267 | nd6log(LOG_INFO, "%s: could not run DAD, driver problem?\n" , |
| 1268 | if_name(ifa->ifa_ifp)); |
| 1269 | |
| 1270 | TAILQ_REMOVE(&dadq, dp, dad_list); |
| 1271 | free(dp, M_IP6NDP); |
| 1272 | dp = NULL; |
| 1273 | ifafree(ifa); |
| 1274 | goto done; |
| 1275 | } |
| 1276 | |
| 1277 | /* Need more checks? */ |
| 1278 | if (dp->dad_ns_ocount < dp->dad_count) { |
| 1279 | /* |
| 1280 | * We have more NS to go. Send NS packet for DAD. |
| 1281 | */ |
| 1282 | nd6_dad_ns_output(dp, ifa); |
| 1283 | nd6_dad_starttimer(dp, |
| 1284 | (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); |
| 1285 | } else { |
| 1286 | /* |
| 1287 | * We have transmitted sufficient number of DAD packets. |
| 1288 | * See what we've got. |
| 1289 | */ |
| 1290 | if (dp->dad_na_icount) { |
| 1291 | /* |
| 1292 | * the check is in nd6_dad_na_input(), |
| 1293 | * but just in case |
| 1294 | */ |
| 1295 | duplicate++; |
| 1296 | } |
| 1297 | |
| 1298 | if (dp->dad_ns_icount) { |
| 1299 | /* We've seen NS, means DAD has failed. */ |
| 1300 | duplicate++; |
| 1301 | } |
| 1302 | |
| 1303 | if (duplicate) { |
| 1304 | /* (*dp) will be freed in nd6_dad_duplicated() */ |
| 1305 | dp = NULL; |
| 1306 | } else { |
| 1307 | /* |
| 1308 | * We are done with DAD. No NA came, no NS came. |
| 1309 | * No duplicate address found. |
| 1310 | */ |
| 1311 | ia->ia6_flags &= ~IN6_IFF_TENTATIVE; |
| 1312 | rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); |
| 1313 | |
| 1314 | nd6log(LOG_DEBUG, |
| 1315 | "%s: DAD complete for %s - no duplicates found\n" , |
| 1316 | if_name(ifa->ifa_ifp), |
| 1317 | ip6_sprintf(&ia->ia_addr.sin6_addr)); |
| 1318 | |
| 1319 | TAILQ_REMOVE(&dadq, dp, dad_list); |
| 1320 | free(dp, M_IP6NDP); |
| 1321 | dp = NULL; |
| 1322 | ifafree(ifa); |
| 1323 | } |
| 1324 | } |
| 1325 | |
| 1326 | done: |
| 1327 | mutex_exit(&nd6_dad_lock); |
| 1328 | |
| 1329 | if (duplicate) |
| 1330 | nd6_dad_duplicated(ifa); |
| 1331 | |
| 1332 | #ifndef NET_MPSAFE |
| 1333 | KERNEL_UNLOCK_ONE(NULL); |
| 1334 | mutex_exit(softnet_lock); |
| 1335 | #endif |
| 1336 | } |
| 1337 | |
| 1338 | void |
| 1339 | nd6_dad_duplicated(struct ifaddr *ifa) |
| 1340 | { |
| 1341 | struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; |
| 1342 | struct ifnet *ifp; |
| 1343 | struct dadq *dp; |
| 1344 | |
| 1345 | mutex_enter(&nd6_dad_lock); |
| 1346 | dp = nd6_dad_find(ifa); |
| 1347 | if (dp == NULL) { |
| 1348 | mutex_exit(&nd6_dad_lock); |
| 1349 | /* DAD seems to be stopping, so do nothing. */ |
| 1350 | return; |
| 1351 | } |
| 1352 | |
| 1353 | ifp = ifa->ifa_ifp; |
| 1354 | log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " |
| 1355 | "NS in/out=%d/%d, NA in=%d\n" , |
| 1356 | if_name(ifp), ip6_sprintf(&ia->ia_addr.sin6_addr), |
| 1357 | dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); |
| 1358 | |
| 1359 | ia->ia6_flags &= ~IN6_IFF_TENTATIVE; |
| 1360 | ia->ia6_flags |= IN6_IFF_DUPLICATED; |
| 1361 | |
| 1362 | /* We are done with DAD, with duplicated address found. (failure) */ |
| 1363 | nd6_dad_stoptimer(dp); |
| 1364 | |
| 1365 | log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n" , |
| 1366 | if_name(ifp), ip6_sprintf(&ia->ia_addr.sin6_addr)); |
| 1367 | log(LOG_ERR, "%s: manual intervention required\n" , |
| 1368 | if_name(ifp)); |
| 1369 | |
| 1370 | /* Inform the routing socket that DAD has completed */ |
| 1371 | rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); |
| 1372 | |
| 1373 | /* |
| 1374 | * If the address is a link-local address formed from an interface |
| 1375 | * identifier based on the hardware address which is supposed to be |
| 1376 | * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP |
| 1377 | * operation on the interface SHOULD be disabled. |
| 1378 | * [rfc2462bis-03 Section 5.4.5] |
| 1379 | */ |
| 1380 | if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) { |
| 1381 | struct in6_addr in6; |
| 1382 | |
| 1383 | /* |
| 1384 | * To avoid over-reaction, we only apply this logic when we are |
| 1385 | * very sure that hardware addresses are supposed to be unique. |
| 1386 | */ |
| 1387 | switch (ifp->if_type) { |
| 1388 | case IFT_ETHER: |
| 1389 | case IFT_FDDI: |
| 1390 | case IFT_ATM: |
| 1391 | case IFT_IEEE1394: |
| 1392 | #ifdef IFT_IEEE80211 |
| 1393 | case IFT_IEEE80211: |
| 1394 | #endif |
| 1395 | in6 = ia->ia_addr.sin6_addr; |
| 1396 | if (in6_get_hw_ifid(ifp, &in6) == 0 && |
| 1397 | IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) { |
| 1398 | ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; |
| 1399 | log(LOG_ERR, "%s: possible hardware address " |
| 1400 | "duplication detected, disable IPv6\n" , |
| 1401 | if_name(ifp)); |
| 1402 | } |
| 1403 | break; |
| 1404 | } |
| 1405 | } |
| 1406 | |
| 1407 | TAILQ_REMOVE(&dadq, dp, dad_list); |
| 1408 | mutex_exit(&nd6_dad_lock); |
| 1409 | |
| 1410 | free(dp, M_IP6NDP); |
| 1411 | dp = NULL; |
| 1412 | ifafree(ifa); |
| 1413 | } |
| 1414 | |
| 1415 | static void |
| 1416 | nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa) |
| 1417 | { |
| 1418 | struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; |
| 1419 | struct ifnet *ifp = ifa->ifa_ifp; |
| 1420 | |
| 1421 | dp->dad_ns_tcount++; |
| 1422 | if ((ifp->if_flags & IFF_UP) == 0) { |
| 1423 | #if 0 |
| 1424 | printf("%s: interface down?\n" , if_name(ifp)); |
| 1425 | #endif |
| 1426 | return; |
| 1427 | } |
| 1428 | if ((ifp->if_flags & IFF_RUNNING) == 0) { |
| 1429 | #if 0 |
| 1430 | printf("%s: interface not running?\n" , if_name(ifp)); |
| 1431 | #endif |
| 1432 | return; |
| 1433 | } |
| 1434 | |
| 1435 | dp->dad_ns_tcount = 0; |
| 1436 | dp->dad_ns_ocount++; |
| 1437 | nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); |
| 1438 | } |
| 1439 | |
| 1440 | static void |
| 1441 | nd6_dad_ns_input(struct ifaddr *ifa) |
| 1442 | { |
| 1443 | struct in6_ifaddr *ia; |
| 1444 | const struct in6_addr *taddr6; |
| 1445 | struct dadq *dp; |
| 1446 | int duplicate; |
| 1447 | |
| 1448 | if (ifa == NULL) |
| 1449 | panic("ifa == NULL in nd6_dad_ns_input" ); |
| 1450 | |
| 1451 | ia = (struct in6_ifaddr *)ifa; |
| 1452 | taddr6 = &ia->ia_addr.sin6_addr; |
| 1453 | duplicate = 0; |
| 1454 | |
| 1455 | mutex_enter(&nd6_dad_lock); |
| 1456 | dp = nd6_dad_find(ifa); |
| 1457 | |
| 1458 | /* Quickhack - completely ignore DAD NS packets */ |
| 1459 | if (dad_ignore_ns) { |
| 1460 | nd6log(LOG_INFO, "ignoring DAD NS packet for " |
| 1461 | "address %s(%s)\n" , ip6_sprintf(taddr6), |
| 1462 | if_name(ifa->ifa_ifp)); |
| 1463 | return; |
| 1464 | } |
| 1465 | |
| 1466 | /* |
| 1467 | * if I'm yet to start DAD, someone else started using this address |
| 1468 | * first. I have a duplicate and you win. |
| 1469 | */ |
| 1470 | if (dp == NULL || dp->dad_ns_ocount == 0) |
| 1471 | duplicate++; |
| 1472 | |
| 1473 | /* XXX more checks for loopback situation - see nd6_dad_timer too */ |
| 1474 | |
| 1475 | if (duplicate) { |
| 1476 | dp = NULL; /* will be freed in nd6_dad_duplicated() */ |
| 1477 | mutex_exit(&nd6_dad_lock); |
| 1478 | nd6_dad_duplicated(ifa); |
| 1479 | } else { |
| 1480 | /* |
| 1481 | * not sure if I got a duplicate. |
| 1482 | * increment ns count and see what happens. |
| 1483 | */ |
| 1484 | if (dp) |
| 1485 | dp->dad_ns_icount++; |
| 1486 | mutex_exit(&nd6_dad_lock); |
| 1487 | } |
| 1488 | } |
| 1489 | |
| 1490 | static void |
| 1491 | nd6_dad_na_input(struct ifaddr *ifa) |
| 1492 | { |
| 1493 | struct dadq *dp; |
| 1494 | |
| 1495 | if (ifa == NULL) |
| 1496 | panic("ifa == NULL in nd6_dad_na_input" ); |
| 1497 | |
| 1498 | mutex_enter(&nd6_dad_lock); |
| 1499 | dp = nd6_dad_find(ifa); |
| 1500 | if (dp) |
| 1501 | dp->dad_na_icount++; |
| 1502 | mutex_exit(&nd6_dad_lock); |
| 1503 | |
| 1504 | /* remove the address. */ |
| 1505 | nd6_dad_duplicated(ifa); |
| 1506 | } |
| 1507 | |