1*9a2314e5Smpi /* $OpenBSD: nd6.c,v 1.231 2020/04/22 07:51:38 mpi Exp $ */ 2d8a7e3a7Sitojun /* $KAME: nd6.c,v 1.280 2002/06/08 19:52:07 itojun Exp $ */ 3287546eaSitojun 4287546eaSitojun /* 5287546eaSitojun * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6287546eaSitojun * All rights reserved. 7287546eaSitojun * 8287546eaSitojun * Redistribution and use in source and binary forms, with or without 9287546eaSitojun * modification, are permitted provided that the following conditions 10287546eaSitojun * are met: 11287546eaSitojun * 1. Redistributions of source code must retain the above copyright 12287546eaSitojun * notice, this list of conditions and the following disclaimer. 13287546eaSitojun * 2. Redistributions in binary form must reproduce the above copyright 14287546eaSitojun * notice, this list of conditions and the following disclaimer in the 15287546eaSitojun * documentation and/or other materials provided with the distribution. 16287546eaSitojun * 3. Neither the name of the project nor the names of its contributors 17287546eaSitojun * may be used to endorse or promote products derived from this software 18287546eaSitojun * without specific prior written permission. 19287546eaSitojun * 20287546eaSitojun * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21287546eaSitojun * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22287546eaSitojun * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23287546eaSitojun * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24287546eaSitojun * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25287546eaSitojun * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26287546eaSitojun * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27287546eaSitojun * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28287546eaSitojun * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29287546eaSitojun * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30287546eaSitojun * SUCH DAMAGE. 31287546eaSitojun */ 32287546eaSitojun 33287546eaSitojun #include <sys/param.h> 34287546eaSitojun #include <sys/systm.h> 35b3c1e4c1Sitojun #include <sys/timeout.h> 36287546eaSitojun #include <sys/malloc.h> 37287546eaSitojun #include <sys/mbuf.h> 38287546eaSitojun #include <sys/socket.h> 39287546eaSitojun #include <sys/sockio.h> 40287546eaSitojun #include <sys/time.h> 41287546eaSitojun #include <sys/kernel.h> 4293fbd125Sbluhm #include <sys/pool.h> 43f4f4d166Sitojun #include <sys/protosw.h> 44287546eaSitojun #include <sys/errno.h> 45287546eaSitojun #include <sys/ioctl.h> 46287546eaSitojun #include <sys/syslog.h> 47287546eaSitojun #include <sys/queue.h> 48c6bbd2a8Sflorian #include <sys/stdint.h> 49a09574ebSkettenis #include <sys/task.h> 50287546eaSitojun 51287546eaSitojun #include <net/if.h> 52287546eaSitojun #include <net/if_dl.h> 53287546eaSitojun #include <net/if_types.h> 54287546eaSitojun #include <net/route.h> 55287546eaSitojun 56287546eaSitojun #include <netinet/in.h> 57287546eaSitojun #include <netinet/if_ether.h> 58cb39d30aSangelos #include <netinet/ip_ipsp.h> 5958aa7d74Sangelos 60287546eaSitojun #include <netinet6/in6_var.h> 61fa86ee14Sitojun #include <netinet/ip6.h> 62287546eaSitojun #include <netinet6/ip6_var.h> 63287546eaSitojun #include <netinet6/nd6.h> 64fa86ee14Sitojun #include <netinet/icmp6.h> 65287546eaSitojun 66287546eaSitojun #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */ 67287546eaSitojun #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */ 68287546eaSitojun 69287546eaSitojun /* timer values */ 70334bfa0aSmpi int nd6_timer_next = -1; /* at which time_uptime nd6_timer runs */ 71334bfa0aSmpi time_t nd6_expire_next = -1; /* at which time_uptime nd6_expire runs */ 72287546eaSitojun int nd6_delay = 5; /* delay first probe time 5 second */ 73287546eaSitojun int nd6_umaxtries = 3; /* maximum unicast query */ 74287546eaSitojun int nd6_mmaxtries = 3; /* maximum multicast query */ 75be4e9e12Sitojun int nd6_gctimer = (60 * 60 * 24); /* 1 day: garbage collection timer */ 76287546eaSitojun 77287546eaSitojun /* preventing too many loops in ND option parsing */ 78287546eaSitojun int nd6_maxndopt = 10; /* max # of ND options allowed */ 79287546eaSitojun 80f6e55599Sitojun int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */ 81f6e55599Sitojun 82b79da24aSitojun #ifdef ND6_DEBUG 83b79da24aSitojun int nd6_debug = 1; 84b79da24aSitojun #else 85b79da24aSitojun int nd6_debug = 0; 86b79da24aSitojun #endif 87b79da24aSitojun 8892c821ddSbluhm TAILQ_HEAD(llinfo_nd6_head, llinfo_nd6) nd6_list; 8993fbd125Sbluhm struct pool nd6_pool; /* pool for llinfo_nd6 structures */ 9092c821ddSbluhm int nd6_inuse, nd6_allocated; 91287546eaSitojun 92287546eaSitojun int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL; 93287546eaSitojun 94334bfa0aSmpi void nd6_timer(void *); 95a0aa363cSjsing void nd6_slowtimo(void *); 96088d4855Smpi void nd6_expire(void *); 97088d4855Smpi void nd6_expire_timer(void *); 98c370e97fSmpi void nd6_invalidate(struct rtentry *); 9918e33022Sbluhm void nd6_free(struct rtentry *); 100334bfa0aSmpi int nd6_llinfo_timer(struct rtentry *); 101287546eaSitojun 102334bfa0aSmpi struct timeout nd6_timer_to; 103b3c1e4c1Sitojun struct timeout nd6_slowtimo_ch; 104088d4855Smpi struct timeout nd6_expire_timeout; 105088d4855Smpi struct task nd6_expire_task; 106b3c1e4c1Sitojun 107287546eaSitojun void 108a0aa363cSjsing nd6_init(void) 109287546eaSitojun { 110287546eaSitojun static int nd6_init_done = 0; 111287546eaSitojun 112287546eaSitojun if (nd6_init_done) { 11335075f95Smpi log(LOG_NOTICE, "%s called more than once\n", __func__); 114287546eaSitojun return; 115287546eaSitojun } 116287546eaSitojun 11792c821ddSbluhm TAILQ_INIT(&nd6_list); 1181378bae2Sdlg pool_init(&nd6_pool, sizeof(struct llinfo_nd6), 0, 1191378bae2Sdlg IPL_SOFTNET, 0, "nd6", NULL); 12093fbd125Sbluhm 121088d4855Smpi task_set(&nd6_expire_task, nd6_expire, NULL); 122a09574ebSkettenis 123287546eaSitojun nd6_init_done = 1; 124287546eaSitojun 125287546eaSitojun /* start timer */ 126334bfa0aSmpi timeout_set_proc(&nd6_timer_to, nd6_timer, &nd6_timer_to); 12722e88dadSmpi timeout_set_proc(&nd6_slowtimo_ch, nd6_slowtimo, NULL); 12829e86e5eSblambert timeout_add_sec(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL); 129088d4855Smpi timeout_set(&nd6_expire_timeout, nd6_expire_timer, NULL); 130287546eaSitojun } 131287546eaSitojun 132d6b9e9b9Sitojun struct nd_ifinfo * 133ee37ea65Smcbride nd6_ifattach(struct ifnet *ifp) 134287546eaSitojun { 135d6b9e9b9Sitojun struct nd_ifinfo *nd; 136287546eaSitojun 137393af863Skrw nd = malloc(sizeof(*nd), M_IP6NDP, M_WAITOK | M_ZERO); 138287546eaSitojun 139d6b9e9b9Sitojun nd->initialized = 1; 140287546eaSitojun 141d6b9e9b9Sitojun nd->basereachable = REACHABLE_TIME; 142d6b9e9b9Sitojun nd->reachable = ND_COMPUTE_RTIME(nd->basereachable); 143d6b9e9b9Sitojun nd->retrans = RETRANS_TIMER; 1442a4a63f1Shenning /* per-interface IFXF_AUTOCONF6 needs to be set too to accept RAs */ 1451b5f410aSitojun 146d6b9e9b9Sitojun return nd; 147287546eaSitojun } 148287546eaSitojun 149d6b9e9b9Sitojun void 150ee37ea65Smcbride nd6_ifdetach(struct nd_ifinfo *nd) 151d6b9e9b9Sitojun { 152d374aaacSitojun 15362cf959dSmpi free(nd, M_IP6NDP, sizeof(*nd)); 154287546eaSitojun } 155287546eaSitojun 156287546eaSitojun void 157ee37ea65Smcbride nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts) 158287546eaSitojun { 159287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 160287546eaSitojun ndopts->nd_opts_search = (struct nd_opt_hdr *)opt; 161287546eaSitojun ndopts->nd_opts_last 162287546eaSitojun = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len); 163287546eaSitojun 164287546eaSitojun if (icmp6len == 0) { 165287546eaSitojun ndopts->nd_opts_done = 1; 166287546eaSitojun ndopts->nd_opts_search = NULL; 167287546eaSitojun } 168287546eaSitojun } 169287546eaSitojun 170287546eaSitojun /* 171287546eaSitojun * Take one ND option. 172287546eaSitojun */ 173287546eaSitojun struct nd_opt_hdr * 174ee37ea65Smcbride nd6_option(union nd_opts *ndopts) 175287546eaSitojun { 176287546eaSitojun struct nd_opt_hdr *nd_opt; 177287546eaSitojun int olen; 178287546eaSitojun 179287546eaSitojun if (!ndopts) 180ab0ea4a9Snayden panic("%s: ndopts == NULL", __func__); 181287546eaSitojun if (!ndopts->nd_opts_last) 18240e42c82Snayden panic("%s: uninitialized ndopts", __func__); 183287546eaSitojun if (!ndopts->nd_opts_search) 184287546eaSitojun return NULL; 185287546eaSitojun if (ndopts->nd_opts_done) 186287546eaSitojun return NULL; 187287546eaSitojun 188287546eaSitojun nd_opt = ndopts->nd_opts_search; 189287546eaSitojun 19015bd77d2Sitojun /* make sure nd_opt_len is inside the buffer */ 19115bd77d2Sitojun if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) { 19215bd77d2Sitojun bzero(ndopts, sizeof(*ndopts)); 19315bd77d2Sitojun return NULL; 19415bd77d2Sitojun } 19515bd77d2Sitojun 196287546eaSitojun olen = nd_opt->nd_opt_len << 3; 197287546eaSitojun if (olen == 0) { 198287546eaSitojun /* 199287546eaSitojun * Message validation requires that all included 200287546eaSitojun * options have a length that is greater than zero. 201287546eaSitojun */ 202287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 203287546eaSitojun return NULL; 204287546eaSitojun } 205287546eaSitojun 206287546eaSitojun ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen); 20715bd77d2Sitojun if (ndopts->nd_opts_search > ndopts->nd_opts_last) { 20815bd77d2Sitojun /* option overruns the end of buffer, invalid */ 20915bd77d2Sitojun bzero(ndopts, sizeof(*ndopts)); 21015bd77d2Sitojun return NULL; 21115bd77d2Sitojun } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) { 21215bd77d2Sitojun /* reached the end of options chain */ 213287546eaSitojun ndopts->nd_opts_done = 1; 214287546eaSitojun ndopts->nd_opts_search = NULL; 215287546eaSitojun } 216287546eaSitojun return nd_opt; 217287546eaSitojun } 218287546eaSitojun 219287546eaSitojun /* 220287546eaSitojun * Parse multiple ND options. 221287546eaSitojun * This function is much easier to use, for ND routines that do not need 222287546eaSitojun * multiple options of the same type. 223287546eaSitojun */ 224287546eaSitojun int 225ee37ea65Smcbride nd6_options(union nd_opts *ndopts) 226287546eaSitojun { 227287546eaSitojun struct nd_opt_hdr *nd_opt; 228287546eaSitojun int i = 0; 229287546eaSitojun 230287546eaSitojun if (!ndopts) 231ab0ea4a9Snayden panic("%s: ndopts == NULL", __func__); 232287546eaSitojun if (!ndopts->nd_opts_last) 23340e42c82Snayden panic("%s: uninitialized ndopts", __func__); 234287546eaSitojun if (!ndopts->nd_opts_search) 235287546eaSitojun return 0; 236287546eaSitojun 237287546eaSitojun while (1) { 238287546eaSitojun nd_opt = nd6_option(ndopts); 239287546eaSitojun if (!nd_opt && !ndopts->nd_opts_last) { 240287546eaSitojun /* 241287546eaSitojun * Message validation requires that all included 242287546eaSitojun * options have a length that is greater than zero. 243287546eaSitojun */ 24407ba5f7cSjca icmp6stat_inc(icp6s_nd_badopt); 245287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 246287546eaSitojun return -1; 247287546eaSitojun } 248287546eaSitojun 249287546eaSitojun if (!nd_opt) 250287546eaSitojun goto skip1; 251287546eaSitojun 252287546eaSitojun switch (nd_opt->nd_opt_type) { 253287546eaSitojun case ND_OPT_SOURCE_LINKADDR: 254287546eaSitojun case ND_OPT_TARGET_LINKADDR: 255287546eaSitojun case ND_OPT_MTU: 256287546eaSitojun case ND_OPT_REDIRECTED_HEADER: 257287546eaSitojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { 25815bd77d2Sitojun nd6log((LOG_INFO, 25915bd77d2Sitojun "duplicated ND6 option found (type=%d)\n", 26015bd77d2Sitojun nd_opt->nd_opt_type)); 261287546eaSitojun /* XXX bark? */ 262287546eaSitojun } else { 263287546eaSitojun ndopts->nd_opt_array[nd_opt->nd_opt_type] 264287546eaSitojun = nd_opt; 265287546eaSitojun } 266287546eaSitojun break; 267287546eaSitojun case ND_OPT_PREFIX_INFORMATION: 268287546eaSitojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) { 269287546eaSitojun ndopts->nd_opt_array[nd_opt->nd_opt_type] 270287546eaSitojun = nd_opt; 271287546eaSitojun } 272287546eaSitojun ndopts->nd_opts_pi_end = 273287546eaSitojun (struct nd_opt_prefix_info *)nd_opt; 274287546eaSitojun break; 275287546eaSitojun default: 276287546eaSitojun /* 277287546eaSitojun * Unknown options must be silently ignored, 278e4d25771Stodd * to accommodate future extension to the protocol. 279287546eaSitojun */ 280b79da24aSitojun nd6log((LOG_DEBUG, 281287546eaSitojun "nd6_options: unsupported option %d - " 282b79da24aSitojun "option ignored\n", nd_opt->nd_opt_type)); 283287546eaSitojun } 284287546eaSitojun 285287546eaSitojun skip1: 286287546eaSitojun i++; 287287546eaSitojun if (i > nd6_maxndopt) { 28807ba5f7cSjca icmp6stat_inc(icp6s_nd_toomanyopt); 289b79da24aSitojun nd6log((LOG_INFO, "too many loop in nd opt\n")); 290287546eaSitojun break; 291287546eaSitojun } 292287546eaSitojun 293287546eaSitojun if (ndopts->nd_opts_done) 294287546eaSitojun break; 295287546eaSitojun } 296287546eaSitojun 297287546eaSitojun return 0; 298287546eaSitojun } 299287546eaSitojun 300287546eaSitojun /* 3019631a17bSitojun * ND6 timer routine to handle ND6 entries 302287546eaSitojun */ 303287546eaSitojun void 304334bfa0aSmpi nd6_llinfo_settimer(struct llinfo_nd6 *ln, unsigned int secs) 3059631a17bSitojun { 306334bfa0aSmpi time_t expire = time_uptime + secs; 307334bfa0aSmpi 308334bfa0aSmpi NET_ASSERT_LOCKED(); 309*9a2314e5Smpi KASSERT(!ISSET(ln->ln_rt->rt_flags, RTF_LOCAL)); 310334bfa0aSmpi 311334bfa0aSmpi ln->ln_rt->rt_expire = expire; 312334bfa0aSmpi if (!timeout_pending(&nd6_timer_to) || expire < nd6_timer_next) { 313334bfa0aSmpi nd6_timer_next = expire; 314334bfa0aSmpi timeout_add_sec(&nd6_timer_to, secs); 3159631a17bSitojun } 3169631a17bSitojun } 3179631a17bSitojun 318a0aa363cSjsing void 319334bfa0aSmpi nd6_timer(void *arg) 320287546eaSitojun { 321334bfa0aSmpi struct llinfo_nd6 *ln, *nln; 322334bfa0aSmpi time_t expire = time_uptime + nd6_gctimer; 323334bfa0aSmpi int secs; 324334bfa0aSmpi 325334bfa0aSmpi NET_LOCK(); 326334bfa0aSmpi TAILQ_FOREACH_SAFE(ln, &nd6_list, ln_list, nln) { 327334bfa0aSmpi struct rtentry *rt = ln->ln_rt; 328334bfa0aSmpi 329334bfa0aSmpi if (rt->rt_expire && rt->rt_expire <= time_uptime) 330334bfa0aSmpi if (nd6_llinfo_timer(rt)) 331334bfa0aSmpi continue; 332334bfa0aSmpi 333334bfa0aSmpi if (rt->rt_expire && rt->rt_expire < expire) 334334bfa0aSmpi expire = rt->rt_expire; 335334bfa0aSmpi } 336334bfa0aSmpi 337334bfa0aSmpi secs = expire - time_uptime; 338334bfa0aSmpi if (secs < 0) 339334bfa0aSmpi secs = 0; 340b089e30eSflorian if (!TAILQ_EMPTY(&nd6_list)) { 341b089e30eSflorian nd6_timer_next = time_uptime + secs; 342334bfa0aSmpi timeout_add_sec(&nd6_timer_to, secs); 343b089e30eSflorian } 344334bfa0aSmpi 345334bfa0aSmpi NET_UNLOCK(); 346334bfa0aSmpi } 347334bfa0aSmpi 348334bfa0aSmpi /* 349334bfa0aSmpi * ND timer state handling. 350334bfa0aSmpi * 351334bfa0aSmpi * Returns 1 if `rt' should no longer be used, 0 otherwise. 352334bfa0aSmpi */ 353334bfa0aSmpi int 354334bfa0aSmpi nd6_llinfo_timer(struct rtentry *rt) 355334bfa0aSmpi { 356334bfa0aSmpi struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 357334bfa0aSmpi struct sockaddr_in6 *dst = satosin6(rt_key(rt)); 3589631a17bSitojun struct ifnet *ifp; 359d374aaacSitojun struct nd_ifinfo *ndi = NULL; 360287546eaSitojun 361334bfa0aSmpi NET_ASSERT_LOCKED(); 3629631a17bSitojun 363334bfa0aSmpi if ((ifp = if_get(rt->rt_ifidx)) == NULL) 364334bfa0aSmpi return 1; 3659631a17bSitojun 366d6b9e9b9Sitojun ndi = ND_IFINFO(ifp); 367287546eaSitojun 368287546eaSitojun switch (ln->ln_state) { 369287546eaSitojun case ND6_LLINFO_INCOMPLETE: 370287546eaSitojun if (ln->ln_asked < nd6_mmaxtries) { 371287546eaSitojun ln->ln_asked++; 372134b71fcSdlg nd6_llinfo_settimer(ln, ndi->retrans / 1000); 3739631a17bSitojun nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 374287546eaSitojun } else { 375287546eaSitojun struct mbuf *m = ln->ln_hold; 376287546eaSitojun if (m) { 3778294a4dfSitojun ln->ln_hold = NULL; 378287546eaSitojun /* 379d8a7e3a7Sitojun * Fake rcvif to make the ICMP error 380d8a7e3a7Sitojun * more helpful in diagnosing for the 381d8a7e3a7Sitojun * receiver. 382287546eaSitojun * XXX: should we consider 383287546eaSitojun * older rcvif? 384287546eaSitojun */ 38528112c65Smpi m->m_pkthdr.ph_ifidx = rt->rt_ifidx; 386d8a7e3a7Sitojun 387287546eaSitojun icmp6_error(m, ICMP6_DST_UNREACH, 388287546eaSitojun ICMP6_DST_UNREACH_ADDR, 0); 389e212adedSkrw if (ln->ln_hold == m) { 390e212adedSkrw /* m is back in ln_hold. Discard. */ 391e212adedSkrw m_freem(ln->ln_hold); 392e212adedSkrw ln->ln_hold = NULL; 393e212adedSkrw } 394287546eaSitojun } 39518e33022Sbluhm nd6_free(rt); 3969631a17bSitojun ln = NULL; 397287546eaSitojun } 398287546eaSitojun break; 399287546eaSitojun case ND6_LLINFO_REACHABLE: 4009631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 401287546eaSitojun ln->ln_state = ND6_LLINFO_STALE; 402134b71fcSdlg nd6_llinfo_settimer(ln, nd6_gctimer); 403be4e9e12Sitojun } 404287546eaSitojun break; 405be4e9e12Sitojun 406be4e9e12Sitojun case ND6_LLINFO_STALE: 407f3fcf2f3Smcbride case ND6_LLINFO_PURGE: 408be4e9e12Sitojun /* Garbage Collection(RFC 2461 5.3) */ 4099631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 41018e33022Sbluhm nd6_free(rt); 4119631a17bSitojun ln = NULL; 4129631a17bSitojun } 413be4e9e12Sitojun break; 414be4e9e12Sitojun 415287546eaSitojun case ND6_LLINFO_DELAY: 4160e39def2Sflorian if (ndi) { 417d374aaacSitojun /* We need NUD */ 418287546eaSitojun ln->ln_asked = 1; 419287546eaSitojun ln->ln_state = ND6_LLINFO_PROBE; 420134b71fcSdlg nd6_llinfo_settimer(ln, ndi->retrans / 1000); 421d374aaacSitojun nd6_ns_output(ifp, &dst->sin6_addr, 422d8a7e3a7Sitojun &dst->sin6_addr, ln, 0); 423be4e9e12Sitojun } 424287546eaSitojun break; 425287546eaSitojun case ND6_LLINFO_PROBE: 426287546eaSitojun if (ln->ln_asked < nd6_umaxtries) { 427287546eaSitojun ln->ln_asked++; 428134b71fcSdlg nd6_llinfo_settimer(ln, ndi->retrans / 1000); 429287546eaSitojun nd6_ns_output(ifp, &dst->sin6_addr, 430287546eaSitojun &dst->sin6_addr, ln, 0); 431d8a7e3a7Sitojun } else { 43218e33022Sbluhm nd6_free(rt); 4339631a17bSitojun ln = NULL; 434d8a7e3a7Sitojun } 435287546eaSitojun break; 436287546eaSitojun } 4379631a17bSitojun 438f5e0f62bSmpi if_put(ifp); 439334bfa0aSmpi 440334bfa0aSmpi return (ln == NULL); 441287546eaSitojun } 442287546eaSitojun 443c6bbd2a8Sflorian void 444c6bbd2a8Sflorian nd6_expire_timer_update(struct in6_ifaddr *ia6) 445c6bbd2a8Sflorian { 446c6bbd2a8Sflorian time_t expire_time = INT64_MAX; 447c6bbd2a8Sflorian int secs; 448c6bbd2a8Sflorian 449c6bbd2a8Sflorian KERNEL_ASSERT_LOCKED(); 450c6bbd2a8Sflorian 451c6bbd2a8Sflorian if (ia6->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) 452c6bbd2a8Sflorian expire_time = ia6->ia6_lifetime.ia6t_expire; 453c6bbd2a8Sflorian 454c6bbd2a8Sflorian if (!(ia6->ia6_flags & IN6_IFF_DEPRECATED) && 455c6bbd2a8Sflorian ia6->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME && 456c6bbd2a8Sflorian expire_time > ia6->ia6_lifetime.ia6t_preferred) 457c6bbd2a8Sflorian expire_time = ia6->ia6_lifetime.ia6t_preferred; 458c6bbd2a8Sflorian 459c6bbd2a8Sflorian if (expire_time == INT64_MAX) 460c6bbd2a8Sflorian return; 461c6bbd2a8Sflorian 462c6bbd2a8Sflorian /* 463c6bbd2a8Sflorian * IFA6_IS_INVALID() and IFA6_IS_DEPRECATED() check for uptime 464c6bbd2a8Sflorian * greater than ia6t_expire or ia6t_preferred, not greater or equal. 465c6bbd2a8Sflorian * Schedule timeout one second later so that either IFA6_IS_INVALID() 466c6bbd2a8Sflorian * or IFA6_IS_DEPRECATED() is true. 467c6bbd2a8Sflorian */ 468c6bbd2a8Sflorian expire_time++; 469c6bbd2a8Sflorian 470334bfa0aSmpi if (!timeout_pending(&nd6_expire_timeout) || 471334bfa0aSmpi nd6_expire_next > expire_time) { 472c6bbd2a8Sflorian secs = expire_time - time_uptime; 473c6bbd2a8Sflorian if (secs < 0) 474c6bbd2a8Sflorian secs = 0; 475c6bbd2a8Sflorian 476c6bbd2a8Sflorian timeout_add_sec(&nd6_expire_timeout, secs); 477334bfa0aSmpi nd6_expire_next = expire_time; 478c6bbd2a8Sflorian } 479c6bbd2a8Sflorian } 480c6bbd2a8Sflorian 4819631a17bSitojun /* 482088d4855Smpi * Expire interface addresses. 4839631a17bSitojun */ 4849631a17bSitojun void 485088d4855Smpi nd6_expire(void *unused) 4869631a17bSitojun { 487a44d5cf0Smpi struct ifnet *ifp; 4889631a17bSitojun 489088d4855Smpi KERNEL_LOCK(); 490aa28b9a6Smpi NET_LOCK(); 49122e88dadSmpi 492a44d5cf0Smpi TAILQ_FOREACH(ifp, &ifnet, if_list) { 493a44d5cf0Smpi struct ifaddr *ifa, *nifa; 494a44d5cf0Smpi struct in6_ifaddr *ia6; 495a44d5cf0Smpi 496a44d5cf0Smpi TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrlist, ifa_list, nifa) { 497a44d5cf0Smpi if (ifa->ifa_addr->sa_family != AF_INET6) 498a44d5cf0Smpi continue; 499a44d5cf0Smpi ia6 = ifatoia6(ifa); 500d8a7e3a7Sitojun /* check address lifetime */ 501d8a7e3a7Sitojun if (IFA6_IS_INVALID(ia6)) { 502d8a7e3a7Sitojun in6_purgeaddr(&ia6->ia_ifa); 503d8a7e3a7Sitojun } else { 504c6bbd2a8Sflorian if (IFA6_IS_DEPRECATED(ia6)) 505c6bbd2a8Sflorian ia6->ia6_flags |= IN6_IFF_DEPRECATED; 506c6bbd2a8Sflorian nd6_expire_timer_update(ia6); 507d8a7e3a7Sitojun } 508d8a7e3a7Sitojun } 509a44d5cf0Smpi } 510d8a7e3a7Sitojun 511aa28b9a6Smpi NET_UNLOCK(); 512088d4855Smpi KERNEL_UNLOCK(); 513287546eaSitojun } 514287546eaSitojun 515a09574ebSkettenis void 516088d4855Smpi nd6_expire_timer(void *unused) 517a09574ebSkettenis { 51893865884Ssashan task_add(net_tq(0), &nd6_expire_task); 519a09574ebSkettenis } 520a09574ebSkettenis 52122770369Sitojun /* 52222770369Sitojun * Nuke neighbor cache/prefix/default router management table, right before 52322770369Sitojun * ifp goes away. 52422770369Sitojun */ 52522770369Sitojun void 526ee37ea65Smcbride nd6_purge(struct ifnet *ifp) 52722770369Sitojun { 52822770369Sitojun struct llinfo_nd6 *ln, *nln; 52922770369Sitojun 53066736630Smpi NET_ASSERT_LOCKED(); 53145ffa37bSmpi 53222770369Sitojun /* 53322770369Sitojun * Nuke neighbor cache entries for the ifp. 53422770369Sitojun */ 53592c821ddSbluhm TAILQ_FOREACH_SAFE(ln, &nd6_list, ln_list, nln) { 53622770369Sitojun struct rtentry *rt; 53722770369Sitojun struct sockaddr_dl *sdl; 53822770369Sitojun 53922770369Sitojun rt = ln->ln_rt; 54092c821ddSbluhm if (rt != NULL && rt->rt_gateway != NULL && 54122770369Sitojun rt->rt_gateway->sa_family == AF_LINK) { 542c7b7b779Sbluhm sdl = satosdl(rt->rt_gateway); 54322770369Sitojun if (sdl->sdl_index == ifp->if_index) 54418e33022Sbluhm nd6_free(rt); 54522770369Sitojun } 54622770369Sitojun } 54722770369Sitojun } 54822770369Sitojun 549287546eaSitojun struct rtentry * 550f4d1af37Smikeb nd6_lookup(struct in6_addr *addr6, int create, struct ifnet *ifp, 551f4d1af37Smikeb u_int rtableid) 552287546eaSitojun { 553287546eaSitojun struct rtentry *rt; 554287546eaSitojun struct sockaddr_in6 sin6; 5555148b194Smpi int flags; 556287546eaSitojun 557287546eaSitojun bzero(&sin6, sizeof(sin6)); 558287546eaSitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 559287546eaSitojun sin6.sin6_family = AF_INET6; 560287546eaSitojun sin6.sin6_addr = *addr6; 56112d3c25cSclaudio flags = (create) ? RT_RESOLVE : 0; 562d8a7e3a7Sitojun 5635148b194Smpi rt = rtalloc(sin6tosa(&sin6), flags, rtableid); 56416119bbfSmpi if (rt != NULL && (rt->rt_flags & RTF_LLINFO) == 0) { 565287546eaSitojun /* 566287546eaSitojun * This is the case for the default route. 567287546eaSitojun * If we want to create a neighbor cache for the address, we 568287546eaSitojun * should free the route for the destination and allocate an 569287546eaSitojun * interface route. 570287546eaSitojun */ 571287546eaSitojun if (create) { 57227ae666cSmpi rtfree(rt); 57327ae666cSmpi rt = NULL; 574287546eaSitojun } 575287546eaSitojun } 57616119bbfSmpi if (rt == NULL) { 577287546eaSitojun if (create && ifp) { 578cb24f5e5Sclaudio struct rt_addrinfo info; 57966f69fe1Smpi struct ifaddr *ifa; 5800ffd01d4Sbluhm int error; 581d374aaacSitojun 582287546eaSitojun /* 583287546eaSitojun * If no route is available and create is set, 584287546eaSitojun * we allocate a host route for the destination 585287546eaSitojun * and treat it like an interface route. 586287546eaSitojun * This hack is necessary for a neighbor which can't 587287546eaSitojun * be covered by our own prefix. 588287546eaSitojun */ 58966f69fe1Smpi ifa = ifaof_ifpforaddr(sin6tosa(&sin6), ifp); 590287546eaSitojun if (ifa == NULL) 591287546eaSitojun return (NULL); 592287546eaSitojun 593287546eaSitojun /* 594287546eaSitojun * Create a new route. RTF_LLINFO is necessary 595287546eaSitojun * to create a Neighbor Cache entry for the 596287546eaSitojun * destination in nd6_rtrequest which will be 5977ffb277fSbluhm * called in rtrequest. 598287546eaSitojun */ 599cb24f5e5Sclaudio bzero(&info, sizeof(info)); 60066f69fe1Smpi info.rti_ifa = ifa; 601c29fc46aSmpi info.rti_flags = RTF_HOST | RTF_LLINFO; 602c3c56496Sbluhm info.rti_info[RTAX_DST] = sin6tosa(&sin6); 603c7b7b779Sbluhm info.rti_info[RTAX_GATEWAY] = sdltosa(ifp->if_sadl); 6047ffb277fSbluhm error = rtrequest(RTM_ADD, &info, RTP_CONNECTED, &rt, 6050ffd01d4Sbluhm rtableid); 6060ffd01d4Sbluhm if (error) 607287546eaSitojun return (NULL); 6089c0643cdSbluhm if (rt->rt_llinfo != NULL) { 609287546eaSitojun struct llinfo_nd6 *ln = 610287546eaSitojun (struct llinfo_nd6 *)rt->rt_llinfo; 611287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 612287546eaSitojun } 613f6e55599Sitojun } else 614287546eaSitojun return (NULL); 615287546eaSitojun } 616287546eaSitojun /* 617287546eaSitojun * Validation for the entry. 618d8a7e3a7Sitojun * Note that the check for rt_llinfo is necessary because a cloned 619d8a7e3a7Sitojun * route from a parent route that has the L flag (e.g. the default 620d8a7e3a7Sitojun * route to a p2p interface) may have the flag, too, while the 621d8a7e3a7Sitojun * destination is not actually a neighbor. 622287546eaSitojun */ 623287546eaSitojun if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 || 624d8a7e3a7Sitojun rt->rt_gateway->sa_family != AF_LINK || rt->rt_llinfo == NULL || 625248f6870Smpi (ifp != NULL && rt->rt_ifidx != ifp->if_index)) { 626287546eaSitojun if (create) { 627bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 62835075f95Smpi nd6log((LOG_DEBUG, "%s: failed to lookup %s (if=%s)\n", 62935075f95Smpi __func__, 630bbcf0337Smpi inet_ntop(AF_INET6, addr6, addr, sizeof(addr)), 631da592434Sitojun ifp ? ifp->if_xname : "unspec")); 632287546eaSitojun } 63316119bbfSmpi rtfree(rt); 634d8a7e3a7Sitojun return (NULL); 635287546eaSitojun } 636287546eaSitojun return (rt); 637287546eaSitojun } 638287546eaSitojun 639287546eaSitojun /* 640287546eaSitojun * Detect if a given IPv6 address identifies a neighbor on a given link. 641287546eaSitojun * XXX: should take care of the destination of a p2p link? 642287546eaSitojun */ 643287546eaSitojun int 644ee37ea65Smcbride nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp) 645287546eaSitojun { 646ef6620bcSmpi struct in6_ifaddr *ia6; 647ef6620bcSmpi struct ifaddr *ifa; 648d8a7e3a7Sitojun struct rtentry *rt; 649287546eaSitojun 650cfb6b8dfSitojun /* 651cfb6b8dfSitojun * A link-local address is always a neighbor. 652cfb6b8dfSitojun * XXX: we should use the sin6_scope_id field rather than the embedded 653cfb6b8dfSitojun * interface index. 654d8a7e3a7Sitojun * XXX: a link does not necessarily specify a single interface. 655cfb6b8dfSitojun */ 656cfb6b8dfSitojun if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) && 657cfb6b8dfSitojun ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index) 658287546eaSitojun return (1); 659287546eaSitojun 660ef6620bcSmpi TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 661ef6620bcSmpi if (ifa->ifa_addr->sa_family != AF_INET6) 662ef6620bcSmpi continue; 663ef6620bcSmpi 664ef6620bcSmpi ia6 = ifatoia6(ifa); 665ef6620bcSmpi 666ef6620bcSmpi /* Prefix check down below. */ 667ef6620bcSmpi if (ia6->ia6_flags & IN6_IFF_AUTOCONF) 668ef6620bcSmpi continue; 669ef6620bcSmpi 670ef6620bcSmpi if (IN6_ARE_MASKED_ADDR_EQUAL(&addr->sin6_addr, 671ef6620bcSmpi &ia6->ia_addr.sin6_addr, 672ef6620bcSmpi &ia6->ia_prefixmask.sin6_addr)) 673ef6620bcSmpi return (1); 674ef6620bcSmpi } 675ef6620bcSmpi 676287546eaSitojun /* 677287546eaSitojun * Even if the address matches none of our addresses, it might be 678287546eaSitojun * in the neighbor cache. 679287546eaSitojun */ 68016119bbfSmpi rt = nd6_lookup(&addr->sin6_addr, 0, ifp, ifp->if_rdomain); 68116119bbfSmpi if (rt != NULL) { 68216119bbfSmpi rtfree(rt); 683287546eaSitojun return (1); 68416119bbfSmpi } 685287546eaSitojun 686287546eaSitojun return (0); 687287546eaSitojun } 688287546eaSitojun 689c370e97fSmpi void 690c370e97fSmpi nd6_invalidate(struct rtentry *rt) 691c370e97fSmpi { 692c370e97fSmpi struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 693c370e97fSmpi 694c370e97fSmpi m_freem(ln->ln_hold); 695c370e97fSmpi ln->ln_hold = NULL; 696c370e97fSmpi ln->ln_state = ND6_LLINFO_INCOMPLETE; 697c370e97fSmpi ln->ln_asked = 0; 698c370e97fSmpi } 699c370e97fSmpi 700287546eaSitojun /* 701287546eaSitojun * Free an nd6 llinfo entry. 702d8a7e3a7Sitojun * Since the function would cause significant changes in the kernel, DO NOT 703d8a7e3a7Sitojun * make it global, unless you have a strong reason for the change, and are sure 704d8a7e3a7Sitojun * that the change is safe. 705287546eaSitojun */ 70618e33022Sbluhm void 70718e33022Sbluhm nd6_free(struct rtentry *rt) 708287546eaSitojun { 70918e33022Sbluhm struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 710c3c56496Sbluhm struct in6_addr in6 = satosin6(rt_key(rt))->sin6_addr; 711248f6870Smpi struct ifnet *ifp; 71245ffa37bSmpi 71366736630Smpi NET_ASSERT_LOCKED(); 714287546eaSitojun 715248f6870Smpi ifp = if_get(rt->rt_ifidx); 716f4f4d166Sitojun 71781d38878Smpi if (!ip6_forwarding) { 7184a2f474dSflorian if (ln->ln_router) { 719f4f4d166Sitojun /* 720f4f4d166Sitojun * rt6_flush must be called whether or not the neighbor 721f4f4d166Sitojun * is in the Default Router List. 722f4f4d166Sitojun * See a corresponding comment in nd6_na_input(). 723f4f4d166Sitojun */ 724248f6870Smpi rt6_flush(&in6, ifp); 725f4f4d166Sitojun } 726287546eaSitojun } 727287546eaSitojun 7286348db95Sbluhm KASSERT(!ISSET(rt->rt_flags, RTF_LOCAL)); 7294dfec2cfSmpi nd6_invalidate(rt); 7304dfec2cfSmpi 73129760ae1Sitojun /* 73229760ae1Sitojun * Detach the route from the routing tree and the list of neighbor 73329760ae1Sitojun * caches, and disable the route entry not to be used in already 73429760ae1Sitojun * cached routes. 73529760ae1Sitojun */ 736c370e97fSmpi if (!ISSET(rt->rt_flags, RTF_STATIC|RTF_CACHED)) 737c4cbcae8Sbluhm rtdeletemsg(rt, ifp, ifp->if_rdomain); 73829760ae1Sitojun 739248f6870Smpi if_put(ifp); 740287546eaSitojun } 741287546eaSitojun 742287546eaSitojun /* 743287546eaSitojun * Upper-layer reachability hint for Neighbor Unreachability Detection. 744287546eaSitojun * 7458b542bbeSpascoe * XXX cost-effective methods? 746287546eaSitojun */ 747287546eaSitojun void 748a7fa3e84Smpi nd6_nud_hint(struct rtentry *rt) 749287546eaSitojun { 750287546eaSitojun struct llinfo_nd6 *ln; 751a7fa3e84Smpi struct ifnet *ifp; 752287546eaSitojun 753a7fa3e84Smpi ifp = if_get(rt->rt_ifidx); 754a7fa3e84Smpi if (ifp == NULL) 755287546eaSitojun return; 756287546eaSitojun 757f6e55599Sitojun if ((rt->rt_flags & RTF_GATEWAY) != 0 || 758f6e55599Sitojun (rt->rt_flags & RTF_LLINFO) == 0 || 7599c0643cdSbluhm rt->rt_llinfo == NULL || rt->rt_gateway == NULL || 760f6e55599Sitojun rt->rt_gateway->sa_family != AF_LINK) { 761287546eaSitojun /* This is not a host route. */ 762a7fa3e84Smpi goto out; 763287546eaSitojun } 764287546eaSitojun 765287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 766804d8827Sitojun if (ln->ln_state < ND6_LLINFO_REACHABLE) 767a7fa3e84Smpi goto out; 768287546eaSitojun 769f6e55599Sitojun /* 770f6e55599Sitojun * if we get upper-layer reachability confirmation many times, 771f6e55599Sitojun * it is possible we have false information. 772f6e55599Sitojun */ 773f6e55599Sitojun ln->ln_byhint++; 774f6e55599Sitojun if (ln->ln_byhint > nd6_maxnudhint) 775a7fa3e84Smpi goto out; 776f6e55599Sitojun 777287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 778a7fa3e84Smpi if (!ND6_LLINFO_PERMANENT(ln)) 779134b71fcSdlg nd6_llinfo_settimer(ln, ND_IFINFO(ifp)->reachable); 780a7fa3e84Smpi out: 781a7fa3e84Smpi if_put(ifp); 782287546eaSitojun } 783287546eaSitojun 784287546eaSitojun void 785dcb17c31Smpi nd6_rtrequest(struct ifnet *ifp, int req, struct rtentry *rt) 786287546eaSitojun { 787287546eaSitojun struct sockaddr *gate = rt->rt_gateway; 788287546eaSitojun struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 789287546eaSitojun struct ifaddr *ifa; 790287546eaSitojun 7914cb08838Sclaudio if (ISSET(rt->rt_flags, RTF_GATEWAY|RTF_MULTICAST|RTF_MPLS)) 792287546eaSitojun return; 793287546eaSitojun 794d8a7e3a7Sitojun if (nd6_need_cache(ifp) == 0 && (rt->rt_flags & RTF_HOST) == 0) { 795d8a7e3a7Sitojun /* 796d8a7e3a7Sitojun * This is probably an interface direct route for a link 797d8a7e3a7Sitojun * which does not need neighbor caches (e.g. fe80::%lo0/64). 798d8a7e3a7Sitojun * We do not need special treatment below for such a route. 799d8a7e3a7Sitojun * Moreover, the RTF_LLINFO flag which would be set below 800d8a7e3a7Sitojun * would annoy the ndp(8) command. 801d8a7e3a7Sitojun */ 802d8a7e3a7Sitojun return; 803d8a7e3a7Sitojun } 804d8a7e3a7Sitojun 805af1344beSbluhm if (req == RTM_RESOLVE && nd6_need_cache(ifp) == 0) { 806d8a7e3a7Sitojun /* 807af1344beSbluhm * For routing daemons like ospf6d we allow neighbor discovery 808af1344beSbluhm * based on the cloning route only. This allows us to sent 809af1344beSbluhm * packets directly into a network without having an address 810af1344beSbluhm * with matching prefix on the interface. If the cloning 811af1344beSbluhm * route is used for an stf interface, we would mistakenly 812af1344beSbluhm * make a neighbor cache for the host route, and would see 813af1344beSbluhm * strange neighbor solicitation for the corresponding 814af1344beSbluhm * destination. In order to avoid confusion, we check if the 815af1344beSbluhm * interface is suitable for neighbor discovery, and stop the 816d8a7e3a7Sitojun * process if not. Additionally, we remove the LLINFO flag 817d8a7e3a7Sitojun * so that ndp(8) will not try to get the neighbor information 818d8a7e3a7Sitojun * of the destination. 819d8a7e3a7Sitojun */ 820d8a7e3a7Sitojun rt->rt_flags &= ~RTF_LLINFO; 821d8a7e3a7Sitojun return; 822d8a7e3a7Sitojun } 823d8a7e3a7Sitojun 824287546eaSitojun switch (req) { 825287546eaSitojun case RTM_ADD: 82648ebf8e1Sitojun if ((rt->rt_flags & RTF_CLONING) || 8279c0643cdSbluhm ((rt->rt_flags & (RTF_LLINFO | RTF_LOCAL)) && ln == NULL)) { 8289c0643cdSbluhm if (ln != NULL) 8299631a17bSitojun nd6_llinfo_settimer(ln, 0); 830d8a7e3a7Sitojun if ((rt->rt_flags & RTF_CLONING) != 0) 831287546eaSitojun break; 832287546eaSitojun } 833f4f4d166Sitojun /* 8348b542bbeSpascoe * In IPv4 code, we try to announce new RTF_ANNOUNCE entry here. 835f4f4d166Sitojun * We don't do that here since llinfo is not ready yet. 836f4f4d166Sitojun * 837f4f4d166Sitojun * There are also couple of other things to be discussed: 838f4f4d166Sitojun * - unsolicited NA code needs improvement beforehand 839f4f4d166Sitojun * - RFC2461 says we MAY send multicast unsolicited NA 840f4f4d166Sitojun * (7.2.6 paragraph 4), however, it also says that we 841f4f4d166Sitojun * SHOULD provide a mechanism to prevent multicast NA storm. 842f4f4d166Sitojun * we don't have anything like it right now. 843841d7adbSitojun * note that the mechanism needs a mutual agreement 844f4f4d166Sitojun * between proxies, which means that we need to implement 845841d7adbSitojun * a new protocol, or a new kludge. 846841d7adbSitojun * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA. 847f4f4d166Sitojun * we need to check ip6forwarding before sending it. 848f4f4d166Sitojun * (or should we allow proxy ND configuration only for 849f4f4d166Sitojun * routers? there's no mention about proxy ND from hosts) 850f4f4d166Sitojun */ 851f4f4d166Sitojun #if 0 852f4f4d166Sitojun /* XXX it does not work */ 853287546eaSitojun if (rt->rt_flags & RTF_ANNOUNCE) 854287546eaSitojun nd6_na_output(ifp, 855c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr, 856c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr, 857287546eaSitojun ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, 858f4f4d166Sitojun 1, NULL); 859f4f4d166Sitojun #endif 860287546eaSitojun /* FALLTHROUGH */ 861287546eaSitojun case RTM_RESOLVE: 862287546eaSitojun if (gate->sa_family != AF_LINK || 863cfc71c8bSclaudio gate->sa_len < sizeof(struct sockaddr_dl)) { 86486b61919Smpi log(LOG_DEBUG, "%s: bad gateway value: %s\n", 86586b61919Smpi __func__, ifp->if_xname); 866287546eaSitojun break; 867287546eaSitojun } 868c7b7b779Sbluhm satosdl(gate)->sdl_type = ifp->if_type; 869c7b7b779Sbluhm satosdl(gate)->sdl_index = ifp->if_index; 870d374aaacSitojun if (ln != NULL) 871287546eaSitojun break; /* This happens on a route change */ 872287546eaSitojun /* 873287546eaSitojun * Case 2: This route may come from cloning, or a manual route 874287546eaSitojun * add with a LL address. 875287546eaSitojun */ 87693fbd125Sbluhm ln = pool_get(&nd6_pool, PR_NOWAIT | PR_ZERO); 877287546eaSitojun rt->rt_llinfo = (caddr_t)ln; 8789c0643cdSbluhm if (ln == NULL) { 87993fbd125Sbluhm log(LOG_DEBUG, "%s: pool get failed\n", __func__); 880287546eaSitojun break; 881287546eaSitojun } 882287546eaSitojun nd6_inuse++; 883287546eaSitojun nd6_allocated++; 884287546eaSitojun ln->ln_rt = rt; 885287546eaSitojun /* this is required for "ndp" command. - shin */ 886287546eaSitojun if (req == RTM_ADD) { 887287546eaSitojun /* 888287546eaSitojun * gate should have some valid AF_LINK entry, 8893bc414e3Sdlg * and ln expire should have some lifetime 890287546eaSitojun * which is specified by ndp command. 891287546eaSitojun */ 892287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 893f6e55599Sitojun ln->ln_byhint = 0; 894287546eaSitojun } else { 895287546eaSitojun /* 896287546eaSitojun * When req == RTM_RESOLVE, rt is created and 897287546eaSitojun * initialized in rtrequest(), so rt_expire is 0. 898287546eaSitojun */ 899287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 9009631a17bSitojun nd6_llinfo_settimer(ln, 0); 901287546eaSitojun } 902287546eaSitojun rt->rt_flags |= RTF_LLINFO; 90392c821ddSbluhm TAILQ_INSERT_HEAD(&nd6_list, ln, ln_list); 904287546eaSitojun 905287546eaSitojun /* 906f3fcf2f3Smcbride * If we have too many cache entries, initiate immediate 907f3fcf2f3Smcbride * purging for some "less recently used" entries. Note that 908f3fcf2f3Smcbride * we cannot directly call nd6_free() here because it would 909f3fcf2f3Smcbride * cause re-entering rtable related routines triggering an LOR 910f3fcf2f3Smcbride * problem for FreeBSD. 911f3fcf2f3Smcbride */ 912f3fcf2f3Smcbride if (ip6_neighborgcthresh >= 0 && 913f3fcf2f3Smcbride nd6_inuse >= ip6_neighborgcthresh) { 914f3fcf2f3Smcbride int i; 915f3fcf2f3Smcbride 91692c821ddSbluhm for (i = 0; i < 10; i++) { 91792c821ddSbluhm struct llinfo_nd6 *ln_end; 91892c821ddSbluhm 91992c821ddSbluhm ln_end = TAILQ_LAST(&nd6_list, llinfo_nd6_head); 92092c821ddSbluhm if (ln_end == ln) 92192c821ddSbluhm break; 922f3fcf2f3Smcbride 923f3fcf2f3Smcbride /* Move this entry to the head */ 92492c821ddSbluhm TAILQ_REMOVE(&nd6_list, ln_end, ln_list); 92592c821ddSbluhm TAILQ_INSERT_HEAD(&nd6_list, ln_end, ln_list); 926f3fcf2f3Smcbride 927f3fcf2f3Smcbride if (ND6_LLINFO_PERMANENT(ln_end)) 928f3fcf2f3Smcbride continue; 929f3fcf2f3Smcbride 930f3fcf2f3Smcbride if (ln_end->ln_state > ND6_LLINFO_INCOMPLETE) 931f3fcf2f3Smcbride ln_end->ln_state = ND6_LLINFO_STALE; 932f3fcf2f3Smcbride else 933f3fcf2f3Smcbride ln_end->ln_state = ND6_LLINFO_PURGE; 934f3fcf2f3Smcbride nd6_llinfo_settimer(ln_end, 0); 935f3fcf2f3Smcbride } 936f3fcf2f3Smcbride } 937f3fcf2f3Smcbride 938f3fcf2f3Smcbride /* 939287546eaSitojun * check if rt_key(rt) is one of my address assigned 940287546eaSitojun * to the interface. 941287546eaSitojun */ 94286b61919Smpi ifa = &in6ifa_ifpwithaddr(ifp, 943c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr)->ia_ifa; 944287546eaSitojun if (ifa) { 945287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 946f6e55599Sitojun ln->ln_byhint = 0; 947334bfa0aSmpi rt->rt_expire = 0; 948fac399ceSmpi KASSERT(ifa == rt->rt_ifa); 949f4f4d166Sitojun } else if (rt->rt_flags & RTF_ANNOUNCE) { 950f4f4d166Sitojun ln->ln_state = ND6_LLINFO_REACHABLE; 951f6e55599Sitojun ln->ln_byhint = 0; 952334bfa0aSmpi rt->rt_expire = 0; 953f4f4d166Sitojun 954f4f4d166Sitojun /* join solicited node multicast for proxy ND */ 955f4f4d166Sitojun if (ifp->if_flags & IFF_MULTICAST) { 956f4f4d166Sitojun struct in6_addr llsol; 957f4f4d166Sitojun int error; 958f4f4d166Sitojun 959c3c56496Sbluhm llsol = satosin6(rt_key(rt))->sin6_addr; 960f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 961f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 962f4f4d166Sitojun llsol.s6_addr32[1] = 0; 963f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 964f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 965f4f4d166Sitojun 966d8a7e3a7Sitojun if (in6_addmulti(&llsol, ifp, &error)) { 967bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 968d8a7e3a7Sitojun nd6log((LOG_ERR, "%s: failed to join " 969d8a7e3a7Sitojun "%s (errno=%d)\n", ifp->if_xname, 970bbcf0337Smpi inet_ntop(AF_INET6, &llsol, 971bbcf0337Smpi addr, sizeof(addr)), 972bbcf0337Smpi error)); 973d8a7e3a7Sitojun } 974f4f4d166Sitojun } 975287546eaSitojun } 976287546eaSitojun break; 977287546eaSitojun 978287546eaSitojun case RTM_DELETE: 9799c0643cdSbluhm if (ln == NULL) 980287546eaSitojun break; 981f4f4d166Sitojun /* leave from solicited node multicast for proxy ND */ 982f4f4d166Sitojun if ((rt->rt_flags & RTF_ANNOUNCE) != 0 && 983f4f4d166Sitojun (ifp->if_flags & IFF_MULTICAST) != 0) { 984f4f4d166Sitojun struct in6_addr llsol; 985f4f4d166Sitojun struct in6_multi *in6m; 986f4f4d166Sitojun 987c3c56496Sbluhm llsol = satosin6(rt_key(rt))->sin6_addr; 988f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 989f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 990f4f4d166Sitojun llsol.s6_addr32[1] = 0; 991f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 992f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 993f4f4d166Sitojun 994f4f4d166Sitojun IN6_LOOKUP_MULTI(llsol, ifp, in6m); 995f4f4d166Sitojun if (in6m) 996f4f4d166Sitojun in6_delmulti(in6m); 997f4f4d166Sitojun } 998287546eaSitojun nd6_inuse--; 99992c821ddSbluhm TAILQ_REMOVE(&nd6_list, ln, ln_list); 1000334bfa0aSmpi rt->rt_expire = 0; 10019c0643cdSbluhm rt->rt_llinfo = NULL; 1002287546eaSitojun rt->rt_flags &= ~RTF_LLINFO; 1003287546eaSitojun m_freem(ln->ln_hold); 100493fbd125Sbluhm pool_put(&nd6_pool, ln); 1005c370e97fSmpi break; 1006c370e97fSmpi 1007c370e97fSmpi case RTM_INVALIDATE: 1008b5675ff3Skrw if (ln == NULL) 1009b5675ff3Skrw break; 1010ad57c59cSbluhm if (!ISSET(rt->rt_flags, RTF_LOCAL)) 1011c370e97fSmpi nd6_invalidate(rt); 1012c370e97fSmpi break; 1013287546eaSitojun } 1014287546eaSitojun } 1015287546eaSitojun 1016287546eaSitojun int 1017ee37ea65Smcbride nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp) 1018287546eaSitojun { 1019287546eaSitojun struct in6_ndireq *ndi = (struct in6_ndireq *)data; 1020287546eaSitojun struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data; 1021287546eaSitojun struct rtentry *rt; 1022287546eaSitojun 1023287546eaSitojun switch (cmd) { 1024d6b9e9b9Sitojun case SIOCGIFINFO_IN6: 1025dd66399bStb NET_RLOCK(); 1026d6b9e9b9Sitojun ndi->ndi = *ND_IFINFO(ifp); 1027dd66399bStb NET_RUNLOCK(); 1028dd66399bStb return (0); 1029287546eaSitojun case SIOCGNBRINFO_IN6: 1030287546eaSitojun { 1031287546eaSitojun struct llinfo_nd6 *ln; 1032287546eaSitojun struct in6_addr nb_addr = nbi->addr; /* make local for safety */ 1033f303499dSdlg time_t expire; 1034287546eaSitojun 1035dd66399bStb NET_RLOCK(); 1036287546eaSitojun /* 1037287546eaSitojun * XXX: KAME specific hack for scoped addresses 1038287546eaSitojun * XXXX: for other scopes than link-local? 1039287546eaSitojun */ 1040287546eaSitojun if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) || 1041287546eaSitojun IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) { 1042287546eaSitojun u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2]; 1043287546eaSitojun 1044287546eaSitojun if (*idp == 0) 1045287546eaSitojun *idp = htons(ifp->if_index); 1046287546eaSitojun } 1047287546eaSitojun 104816119bbfSmpi rt = nd6_lookup(&nb_addr, 0, ifp, ifp->if_rdomain); 104916119bbfSmpi if (rt == NULL || 1050d8a7e3a7Sitojun (ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) { 105116119bbfSmpi rtfree(rt); 1052dd66399bStb NET_RUNLOCK(); 1053dd66399bStb return (EINVAL); 1054287546eaSitojun } 10553bc414e3Sdlg expire = ln->ln_rt->rt_expire; 1056f303499dSdlg if (expire != 0) { 1057f303499dSdlg expire -= time_uptime; 1058f303499dSdlg expire += time_second; 1059f303499dSdlg } 1060f303499dSdlg 1061287546eaSitojun nbi->state = ln->ln_state; 1062287546eaSitojun nbi->asked = ln->ln_asked; 1063287546eaSitojun nbi->isrouter = ln->ln_router; 1064f303499dSdlg nbi->expire = expire; 1065287546eaSitojun 1066dd66399bStb rtfree(rt); 1067dd66399bStb NET_RUNLOCK(); 1068dd66399bStb return (0); 1069287546eaSitojun } 1070287546eaSitojun } 1071dd66399bStb return (0); 1072287546eaSitojun } 1073287546eaSitojun 1074287546eaSitojun /* 1075287546eaSitojun * Create neighbor cache entry and cache link-layer address, 1076287546eaSitojun * on reception of inbound ND6 packets. (RS/RA/NS/redirect) 1077ee37ea65Smcbride * 1078ee37ea65Smcbride * type - ICMP6 type 1079ee37ea65Smcbride * code - type dependent information 1080287546eaSitojun */ 1081db435b2aSmpi void 1082ee37ea65Smcbride nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr, 1083ee37ea65Smcbride int lladdrlen, int type, int code) 1084287546eaSitojun { 1085287546eaSitojun struct rtentry *rt = NULL; 1086287546eaSitojun struct llinfo_nd6 *ln = NULL; 1087287546eaSitojun int is_newentry; 1088287546eaSitojun struct sockaddr_dl *sdl = NULL; 1089287546eaSitojun int do_update; 1090287546eaSitojun int olladdr; 1091287546eaSitojun int llchange; 1092287546eaSitojun int newstate = 0; 1093287546eaSitojun 1094287546eaSitojun if (!ifp) 1095ab0ea4a9Snayden panic("%s: ifp == NULL", __func__); 1096287546eaSitojun if (!from) 1097ab0ea4a9Snayden panic("%s: from == NULL", __func__); 1098287546eaSitojun 1099287546eaSitojun /* nothing must be updated for unspecified address */ 1100287546eaSitojun if (IN6_IS_ADDR_UNSPECIFIED(from)) 1101db435b2aSmpi return; 1102287546eaSitojun 1103287546eaSitojun /* 1104287546eaSitojun * Validation about ifp->if_addrlen and lladdrlen must be done in 1105287546eaSitojun * the caller. 1106287546eaSitojun * 11078b542bbeSpascoe * XXX If the link does not have link-layer address, what should 1108287546eaSitojun * we do? (ifp->if_addrlen == 0) 1109287546eaSitojun * Spec says nothing in sections for RA, RS and NA. There's small 1110287546eaSitojun * description on it in NS section (RFC 2461 7.2.3). 1111287546eaSitojun */ 1112287546eaSitojun 1113f4d1af37Smikeb rt = nd6_lookup(from, 0, ifp, ifp->if_rdomain); 111416119bbfSmpi if (rt == NULL) { 11155148b194Smpi rt = nd6_lookup(from, 1, ifp, ifp->if_rdomain); 1116287546eaSitojun is_newentry = 1; 11170a2c5741Sitojun } else { 11188e6c5245Smpi /* do not overwrite local or static entry */ 11198e6c5245Smpi if (ISSET(rt->rt_flags, RTF_STATIC|RTF_LOCAL)) { 112016119bbfSmpi rtfree(rt); 1121db435b2aSmpi return; 112216119bbfSmpi } 1123287546eaSitojun is_newentry = 0; 11240a2c5741Sitojun } 1125287546eaSitojun 1126287546eaSitojun if (!rt) 1127db435b2aSmpi return; 1128287546eaSitojun if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) { 1129287546eaSitojun fail: 113018e33022Sbluhm nd6_free(rt); 113116119bbfSmpi rtfree(rt); 1132db435b2aSmpi return; 1133287546eaSitojun } 1134287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 11359c0643cdSbluhm if (ln == NULL) 1136287546eaSitojun goto fail; 11379c0643cdSbluhm if (rt->rt_gateway == NULL) 1138287546eaSitojun goto fail; 1139287546eaSitojun if (rt->rt_gateway->sa_family != AF_LINK) 1140287546eaSitojun goto fail; 1141c7b7b779Sbluhm sdl = satosdl(rt->rt_gateway); 1142287546eaSitojun 1143287546eaSitojun olladdr = (sdl->sdl_alen) ? 1 : 0; 1144287546eaSitojun if (olladdr && lladdr) { 1145287546eaSitojun if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 1146287546eaSitojun llchange = 1; 1147287546eaSitojun else 1148287546eaSitojun llchange = 0; 1149287546eaSitojun } else 1150287546eaSitojun llchange = 0; 1151287546eaSitojun 1152287546eaSitojun /* 1153287546eaSitojun * newentry olladdr lladdr llchange (*=record) 1154287546eaSitojun * 0 n n -- (1) 1155287546eaSitojun * 0 y n -- (2) 1156287546eaSitojun * 0 n y -- (3) * STALE 1157287546eaSitojun * 0 y y n (4) * 1158287546eaSitojun * 0 y y y (5) * STALE 1159287546eaSitojun * 1 -- n -- (6) NOSTATE(= PASSIVE) 1160287546eaSitojun * 1 -- y -- (7) * STALE 1161287546eaSitojun */ 1162287546eaSitojun 1163c8a7c9e3Sbluhm if (llchange) { 1164bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 1165c8a7c9e3Sbluhm log(LOG_INFO, "ndp info overwritten for %s by %s on %s\n", 1166bbcf0337Smpi inet_ntop(AF_INET6, from, addr, sizeof(addr)), 1167bbcf0337Smpi ether_sprintf(lladdr), ifp->if_xname); 1168c8a7c9e3Sbluhm } 1169287546eaSitojun if (lladdr) { /* (3-5) and (7) */ 1170287546eaSitojun /* 1171287546eaSitojun * Record source link-layer address 1172287546eaSitojun * XXX is it dependent to ifp->if_type? 1173287546eaSitojun */ 1174287546eaSitojun sdl->sdl_alen = ifp->if_addrlen; 1175287546eaSitojun bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 1176287546eaSitojun } 1177287546eaSitojun 1178287546eaSitojun if (!is_newentry) { 1179d8a7e3a7Sitojun if ((!olladdr && lladdr) || /* (3) */ 1180d8a7e3a7Sitojun (olladdr && lladdr && llchange)) { /* (5) */ 1181287546eaSitojun do_update = 1; 1182287546eaSitojun newstate = ND6_LLINFO_STALE; 1183287546eaSitojun } else /* (1-2,4) */ 1184287546eaSitojun do_update = 0; 1185287546eaSitojun } else { 1186287546eaSitojun do_update = 1; 1187287546eaSitojun if (!lladdr) /* (6) */ 1188287546eaSitojun newstate = ND6_LLINFO_NOSTATE; 1189287546eaSitojun else /* (7) */ 1190287546eaSitojun newstate = ND6_LLINFO_STALE; 1191287546eaSitojun } 1192287546eaSitojun 1193287546eaSitojun if (do_update) { 1194287546eaSitojun /* 1195287546eaSitojun * Update the state of the neighbor cache. 1196287546eaSitojun */ 1197287546eaSitojun ln->ln_state = newstate; 1198287546eaSitojun 1199287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 12008a7bb304Sitojun /* 120153b39a0bSmpi * Since nd6_resolve() in ifp->if_output() will cause 12028b542bbeSpascoe * state transition to DELAY and reset the timer, 12038a7bb304Sitojun * we must set the timer now, although it is actually 12048a7bb304Sitojun * meaningless. 12058a7bb304Sitojun */ 1206134b71fcSdlg nd6_llinfo_settimer(ln, nd6_gctimer); 12078a7bb304Sitojun 1208287546eaSitojun if (ln->ln_hold) { 1209e212adedSkrw struct mbuf *n = ln->ln_hold; 1210e212adedSkrw ln->ln_hold = NULL; 12116afad192Sitojun /* 12126afad192Sitojun * we assume ifp is not a p2p here, so just 12136afad192Sitojun * set the 2nd argument as the 1st one. 12146afad192Sitojun */ 121553b39a0bSmpi ifp->if_output(ifp, n, rt_key(rt), rt); 1216e212adedSkrw if (ln->ln_hold == n) { 1217e212adedSkrw /* n is back in ln_hold. Discard. */ 1218e212adedSkrw m_freem(ln->ln_hold); 12198a7bb304Sitojun ln->ln_hold = NULL; 1220287546eaSitojun } 1221e212adedSkrw } 1222287546eaSitojun } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 1223287546eaSitojun /* probe right away */ 1224334bfa0aSmpi nd6_llinfo_settimer(ln, 0); 1225287546eaSitojun } 1226287546eaSitojun } 1227287546eaSitojun 1228287546eaSitojun /* 1229287546eaSitojun * ICMP6 type dependent behavior. 1230287546eaSitojun * 1231287546eaSitojun * NS: clear IsRouter if new entry 1232287546eaSitojun * RS: clear IsRouter 1233287546eaSitojun * RA: set IsRouter if there's lladdr 1234287546eaSitojun * redir: clear IsRouter if new entry 1235287546eaSitojun * 1236287546eaSitojun * RA case, (1): 1237287546eaSitojun * The spec says that we must set IsRouter in the following cases: 1238287546eaSitojun * - If lladdr exist, set IsRouter. This means (1-5). 1239287546eaSitojun * - If it is old entry (!newentry), set IsRouter. This means (7). 1240287546eaSitojun * So, based on the spec, in (1-5) and (7) cases we must set IsRouter. 12418b542bbeSpascoe * A question arises for (1) case. (1) case has no lladdr in the 1242287546eaSitojun * neighbor cache, this is similar to (6). 1243287546eaSitojun * This case is rare but we figured that we MUST NOT set IsRouter. 1244287546eaSitojun * 1245287546eaSitojun * newentry olladdr lladdr llchange NS RS RA redir 1246287546eaSitojun * D R 1247287546eaSitojun * 0 n n -- (1) c ? s 1248287546eaSitojun * 0 y n -- (2) c s s 1249287546eaSitojun * 0 n y -- (3) c s s 1250287546eaSitojun * 0 y y n (4) c s s 1251287546eaSitojun * 0 y y y (5) c s s 1252287546eaSitojun * 1 -- n -- (6) c c c s 1253287546eaSitojun * 1 -- y -- (7) c c s c s 1254287546eaSitojun * 1255287546eaSitojun * (c=clear s=set) 1256287546eaSitojun */ 1257287546eaSitojun switch (type & 0xff) { 1258287546eaSitojun case ND_NEIGHBOR_SOLICIT: 1259287546eaSitojun /* 1260287546eaSitojun * New entry must have is_router flag cleared. 1261287546eaSitojun */ 1262287546eaSitojun if (is_newentry) /* (6-7) */ 1263287546eaSitojun ln->ln_router = 0; 1264287546eaSitojun break; 1265287546eaSitojun case ND_REDIRECT: 1266287546eaSitojun /* 1267287546eaSitojun * If the icmp is a redirect to a better router, always set the 1268287546eaSitojun * is_router flag. Otherwise, if the entry is newly created, 1269287546eaSitojun * clear the flag. [RFC 2461, sec 8.3] 1270287546eaSitojun */ 1271287546eaSitojun if (code == ND_REDIRECT_ROUTER) 1272287546eaSitojun ln->ln_router = 1; 1273287546eaSitojun else if (is_newentry) /* (6-7) */ 1274287546eaSitojun ln->ln_router = 0; 1275287546eaSitojun break; 1276287546eaSitojun case ND_ROUTER_SOLICIT: 1277287546eaSitojun /* 1278287546eaSitojun * is_router flag must always be cleared. 1279287546eaSitojun */ 1280287546eaSitojun ln->ln_router = 0; 1281287546eaSitojun break; 1282287546eaSitojun case ND_ROUTER_ADVERT: 1283287546eaSitojun /* 1284287546eaSitojun * Mark an entry with lladdr as a router. 1285287546eaSitojun */ 1286d8a7e3a7Sitojun if ((!is_newentry && (olladdr || lladdr)) || /* (2-5) */ 1287d8a7e3a7Sitojun (is_newentry && lladdr)) { /* (7) */ 1288287546eaSitojun ln->ln_router = 1; 1289287546eaSitojun } 1290287546eaSitojun break; 1291287546eaSitojun } 1292287546eaSitojun 129316119bbfSmpi rtfree(rt); 1294287546eaSitojun } 1295287546eaSitojun 1296a0aa363cSjsing void 1297ee37ea65Smcbride nd6_slowtimo(void *ignored_arg) 1298287546eaSitojun { 1299b3c1e4c1Sitojun struct nd_ifinfo *nd6if; 1300d6b9e9b9Sitojun struct ifnet *ifp; 130122e88dadSmpi 1302aa28b9a6Smpi NET_LOCK(); 1303287546eaSitojun 130429e86e5eSblambert timeout_add_sec(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL); 130522e88dadSmpi 1306d814b14cSbluhm TAILQ_FOREACH(ifp, &ifnet, if_list) { 1307d6b9e9b9Sitojun nd6if = ND_IFINFO(ifp); 1308287546eaSitojun if (nd6if->basereachable && /* already initialized */ 1309287546eaSitojun (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) { 1310287546eaSitojun /* 1311287546eaSitojun * Since reachable time rarely changes by router 1312287546eaSitojun * advertisements, we SHOULD insure that a new random 1313287546eaSitojun * value gets recomputed at least once every few hours. 1314287546eaSitojun * (RFC 2461, 6.3.4) 1315287546eaSitojun */ 1316287546eaSitojun nd6if->recalctm = nd6_recalc_reachtm_interval; 1317287546eaSitojun nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable); 1318287546eaSitojun } 1319287546eaSitojun } 1320aa28b9a6Smpi NET_UNLOCK(); 1321287546eaSitojun } 1322287546eaSitojun 1323287546eaSitojun int 13245d32b3a0Smpi nd6_resolve(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m, 13255d32b3a0Smpi struct sockaddr *dst, u_char *desten) 13265d32b3a0Smpi { 13275d32b3a0Smpi struct sockaddr_dl *sdl; 13285d32b3a0Smpi struct rtentry *rt; 1329287546eaSitojun struct llinfo_nd6 *ln = NULL; 1330287546eaSitojun 13315d32b3a0Smpi if (m->m_flags & M_MCAST) { 13325d32b3a0Smpi ETHER_MAP_IPV6_MULTICAST(&satosin6(dst)->sin6_addr, desten); 13335d32b3a0Smpi return (0); 13345d32b3a0Smpi } 13355b3a2895Ssthen 1336c370e97fSmpi rt = rt_getll(rt0); 1337c370e97fSmpi 1338c370e97fSmpi if (ISSET(rt->rt_flags, RTF_REJECT) && 1339c370e97fSmpi (rt->rt_expire == 0 || time_uptime < rt->rt_expire)) { 13408c023157Smpi m_freem(m); 1341c370e97fSmpi return (rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 1342287546eaSitojun } 1343cfb6b8dfSitojun 1344287546eaSitojun /* 1345287546eaSitojun * Address resolution or Neighbor Unreachability Detection 1346287546eaSitojun * for the next hop. 1347287546eaSitojun * At this point, the destination of the packet must be a unicast 1348287546eaSitojun * or an anycast address(i.e. not a multicast). 1349287546eaSitojun */ 13505da3fb44Smpi if (!ISSET(rt->rt_flags, RTF_LLINFO)) { 1351bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 13525da3fb44Smpi log(LOG_DEBUG, "%s: %s: route contains no ND information\n", 13535da3fb44Smpi __func__, inet_ntop(AF_INET6, 13545da3fb44Smpi &satosin6(rt_key(rt))->sin6_addr, addr, sizeof(addr))); 135516119bbfSmpi m_freem(m); 13565da3fb44Smpi return (EINVAL); 1357287546eaSitojun } 1358287546eaSitojun 13595d32b3a0Smpi if (rt->rt_gateway->sa_family != AF_LINK) { 13605d32b3a0Smpi printf("%s: something odd happens\n", __func__); 13615d32b3a0Smpi m_freem(m); 13625d32b3a0Smpi return (EINVAL); 13635d32b3a0Smpi } 13645d32b3a0Smpi 13655da3fb44Smpi ln = (struct llinfo_nd6 *)rt->rt_llinfo; 13665da3fb44Smpi KASSERT(ln != NULL); 1367cfb6b8dfSitojun 1368f3fcf2f3Smcbride /* 1369f3fcf2f3Smcbride * Move this entry to the head of the queue so that it is less likely 1370f3fcf2f3Smcbride * for this entry to be a target of forced garbage collection (see 1371f3fcf2f3Smcbride * nd6_rtrequest()). 1372f3fcf2f3Smcbride */ 137392c821ddSbluhm TAILQ_REMOVE(&nd6_list, ln, ln_list); 137492c821ddSbluhm TAILQ_INSERT_HEAD(&nd6_list, ln, ln_list); 1375f3fcf2f3Smcbride 1376287546eaSitojun /* 1377287546eaSitojun * The first time we send a packet to a neighbor whose entry is 1378287546eaSitojun * STALE, we have to change the state to DELAY and a sets a timer to 1379287546eaSitojun * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do 1380287546eaSitojun * neighbor unreachability detection on expiration. 1381287546eaSitojun * (RFC 2461 7.3.3) 1382287546eaSitojun */ 1383287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 1384287546eaSitojun ln->ln_asked = 0; 1385287546eaSitojun ln->ln_state = ND6_LLINFO_DELAY; 1386134b71fcSdlg nd6_llinfo_settimer(ln, nd6_delay); 1387287546eaSitojun } 1388287546eaSitojun 1389287546eaSitojun /* 1390287546eaSitojun * If the neighbor cache entry has a state other than INCOMPLETE 139134deef1eSitojun * (i.e. its link-layer address is already resolved), just 1392287546eaSitojun * send the packet. 1393287546eaSitojun */ 13945d32b3a0Smpi if (ln->ln_state > ND6_LLINFO_INCOMPLETE) { 13955d32b3a0Smpi sdl = satosdl(rt->rt_gateway); 13965d32b3a0Smpi if (sdl->sdl_alen != ETHER_ADDR_LEN) { 13975d32b3a0Smpi char addr[INET6_ADDRSTRLEN]; 13985d32b3a0Smpi log(LOG_DEBUG, "%s: %s: incorrect nd6 information\n", 13995d32b3a0Smpi __func__, 14005d32b3a0Smpi inet_ntop(AF_INET6, &satosin6(dst)->sin6_addr, 14015d32b3a0Smpi addr, sizeof(addr))); 14025d32b3a0Smpi m_freem(m); 14035d32b3a0Smpi return (EINVAL); 14045d32b3a0Smpi } 14055d32b3a0Smpi 14065d32b3a0Smpi bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 14075d32b3a0Smpi return (0); 14085d32b3a0Smpi } 1409287546eaSitojun 1410287546eaSitojun /* 1411287546eaSitojun * There is a neighbor cache entry, but no ethernet address 1412287546eaSitojun * response yet. Replace the held mbuf (if any) with this 1413287546eaSitojun * latest one. 1414287546eaSitojun */ 1415efcf292bSitojun if (ln->ln_state == ND6_LLINFO_NOSTATE) 1416287546eaSitojun ln->ln_state = ND6_LLINFO_INCOMPLETE; 1417287546eaSitojun m_freem(ln->ln_hold); 1418287546eaSitojun ln->ln_hold = m; 14195d32b3a0Smpi 142076843262Sitojun /* 142176843262Sitojun * If there has been no NS for the neighbor after entering the 142276843262Sitojun * INCOMPLETE state, send the first solicitation. 142376843262Sitojun */ 14249631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln) && ln->ln_asked == 0) { 1425287546eaSitojun ln->ln_asked++; 1426134b71fcSdlg nd6_llinfo_settimer(ln, ND_IFINFO(ifp)->retrans / 1000); 14275d32b3a0Smpi nd6_ns_output(ifp, NULL, &satosin6(dst)->sin6_addr, ln, 0); 1428287546eaSitojun } 14295d32b3a0Smpi return (EAGAIN); 1430287546eaSitojun } 1431287546eaSitojun 1432287546eaSitojun int 1433ee37ea65Smcbride nd6_need_cache(struct ifnet *ifp) 1434d8a7e3a7Sitojun { 1435d8a7e3a7Sitojun /* 1436d8a7e3a7Sitojun * RFC2893 says: 1437d8a7e3a7Sitojun * - unidirectional tunnels needs no ND 1438d8a7e3a7Sitojun */ 1439d8a7e3a7Sitojun switch (ifp->if_type) { 1440d8a7e3a7Sitojun case IFT_ETHER: 1441d8a7e3a7Sitojun case IFT_IEEE80211: 1442f4433d56Shenning case IFT_CARP: 1443d8a7e3a7Sitojun return (1); 1444d8a7e3a7Sitojun default: 1445d8a7e3a7Sitojun return (0); 1446d8a7e3a7Sitojun } 1447d8a7e3a7Sitojun } 1448