1*7e3957d1Sbluhm /* $OpenBSD: nd6.c,v 1.237 2022/02/07 15:23:43 bluhm 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 */ 703209772dScheloha int nd6_timer_next = -1; /* at which uptime nd6_timer runs */ 713209772dScheloha time_t nd6_expire_next = -1; /* at which 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; 1441b5f410aSitojun 145d6b9e9b9Sitojun return nd; 146287546eaSitojun } 147287546eaSitojun 148d6b9e9b9Sitojun void 149ee37ea65Smcbride nd6_ifdetach(struct nd_ifinfo *nd) 150d6b9e9b9Sitojun { 151d374aaacSitojun 15262cf959dSmpi free(nd, M_IP6NDP, sizeof(*nd)); 153287546eaSitojun } 154287546eaSitojun 155287546eaSitojun void 156ee37ea65Smcbride nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts) 157287546eaSitojun { 158287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 159287546eaSitojun ndopts->nd_opts_search = (struct nd_opt_hdr *)opt; 160287546eaSitojun ndopts->nd_opts_last 161287546eaSitojun = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len); 162287546eaSitojun 163287546eaSitojun if (icmp6len == 0) { 164287546eaSitojun ndopts->nd_opts_done = 1; 165287546eaSitojun ndopts->nd_opts_search = NULL; 166287546eaSitojun } 167287546eaSitojun } 168287546eaSitojun 169287546eaSitojun /* 170287546eaSitojun * Take one ND option. 171287546eaSitojun */ 172287546eaSitojun struct nd_opt_hdr * 173ee37ea65Smcbride nd6_option(union nd_opts *ndopts) 174287546eaSitojun { 175287546eaSitojun struct nd_opt_hdr *nd_opt; 176287546eaSitojun int olen; 177287546eaSitojun 178287546eaSitojun if (!ndopts) 179ab0ea4a9Snayden panic("%s: ndopts == NULL", __func__); 180287546eaSitojun if (!ndopts->nd_opts_last) 18140e42c82Snayden panic("%s: uninitialized ndopts", __func__); 182287546eaSitojun if (!ndopts->nd_opts_search) 183287546eaSitojun return NULL; 184287546eaSitojun if (ndopts->nd_opts_done) 185287546eaSitojun return NULL; 186287546eaSitojun 187287546eaSitojun nd_opt = ndopts->nd_opts_search; 188287546eaSitojun 18915bd77d2Sitojun /* make sure nd_opt_len is inside the buffer */ 19015bd77d2Sitojun if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) { 19115bd77d2Sitojun bzero(ndopts, sizeof(*ndopts)); 19215bd77d2Sitojun return NULL; 19315bd77d2Sitojun } 19415bd77d2Sitojun 195287546eaSitojun olen = nd_opt->nd_opt_len << 3; 196287546eaSitojun if (olen == 0) { 197287546eaSitojun /* 198287546eaSitojun * Message validation requires that all included 199287546eaSitojun * options have a length that is greater than zero. 200287546eaSitojun */ 201287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 202287546eaSitojun return NULL; 203287546eaSitojun } 204287546eaSitojun 205287546eaSitojun ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen); 20615bd77d2Sitojun if (ndopts->nd_opts_search > ndopts->nd_opts_last) { 20715bd77d2Sitojun /* option overruns the end of buffer, invalid */ 20815bd77d2Sitojun bzero(ndopts, sizeof(*ndopts)); 20915bd77d2Sitojun return NULL; 21015bd77d2Sitojun } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) { 21115bd77d2Sitojun /* reached the end of options chain */ 212287546eaSitojun ndopts->nd_opts_done = 1; 213287546eaSitojun ndopts->nd_opts_search = NULL; 214287546eaSitojun } 215287546eaSitojun return nd_opt; 216287546eaSitojun } 217287546eaSitojun 218287546eaSitojun /* 219287546eaSitojun * Parse multiple ND options. 220287546eaSitojun * This function is much easier to use, for ND routines that do not need 221287546eaSitojun * multiple options of the same type. 222287546eaSitojun */ 223287546eaSitojun int 224ee37ea65Smcbride nd6_options(union nd_opts *ndopts) 225287546eaSitojun { 226287546eaSitojun struct nd_opt_hdr *nd_opt; 227287546eaSitojun int i = 0; 228287546eaSitojun 229287546eaSitojun if (!ndopts) 230ab0ea4a9Snayden panic("%s: ndopts == NULL", __func__); 231287546eaSitojun if (!ndopts->nd_opts_last) 23240e42c82Snayden panic("%s: uninitialized ndopts", __func__); 233287546eaSitojun if (!ndopts->nd_opts_search) 234287546eaSitojun return 0; 235287546eaSitojun 236287546eaSitojun while (1) { 237287546eaSitojun nd_opt = nd6_option(ndopts); 238287546eaSitojun if (!nd_opt && !ndopts->nd_opts_last) { 239287546eaSitojun /* 240287546eaSitojun * Message validation requires that all included 241287546eaSitojun * options have a length that is greater than zero. 242287546eaSitojun */ 24307ba5f7cSjca icmp6stat_inc(icp6s_nd_badopt); 244287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 245287546eaSitojun return -1; 246287546eaSitojun } 247287546eaSitojun 248287546eaSitojun if (!nd_opt) 249287546eaSitojun goto skip1; 250287546eaSitojun 251287546eaSitojun switch (nd_opt->nd_opt_type) { 252287546eaSitojun case ND_OPT_SOURCE_LINKADDR: 253287546eaSitojun case ND_OPT_TARGET_LINKADDR: 254287546eaSitojun case ND_OPT_MTU: 255287546eaSitojun case ND_OPT_REDIRECTED_HEADER: 256287546eaSitojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { 25715bd77d2Sitojun nd6log((LOG_INFO, 25815bd77d2Sitojun "duplicated ND6 option found (type=%d)\n", 25915bd77d2Sitojun nd_opt->nd_opt_type)); 260287546eaSitojun /* XXX bark? */ 261287546eaSitojun } else { 262287546eaSitojun ndopts->nd_opt_array[nd_opt->nd_opt_type] 263287546eaSitojun = nd_opt; 264287546eaSitojun } 265287546eaSitojun break; 266287546eaSitojun case ND_OPT_PREFIX_INFORMATION: 267287546eaSitojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) { 268287546eaSitojun ndopts->nd_opt_array[nd_opt->nd_opt_type] 269287546eaSitojun = nd_opt; 270287546eaSitojun } 271287546eaSitojun ndopts->nd_opts_pi_end = 272287546eaSitojun (struct nd_opt_prefix_info *)nd_opt; 273287546eaSitojun break; 2744043f337Ssthen case ND_OPT_DNSSL: 2754043f337Ssthen case ND_OPT_RDNSS: 2764043f337Ssthen /* Don't warn */ 2774043f337Ssthen break; 278287546eaSitojun default: 279287546eaSitojun /* 280287546eaSitojun * Unknown options must be silently ignored, 281e4d25771Stodd * to accommodate future extension to the protocol. 282287546eaSitojun */ 283b79da24aSitojun nd6log((LOG_DEBUG, 284287546eaSitojun "nd6_options: unsupported option %d - " 285b79da24aSitojun "option ignored\n", nd_opt->nd_opt_type)); 286287546eaSitojun } 287287546eaSitojun 288287546eaSitojun skip1: 289287546eaSitojun i++; 290287546eaSitojun if (i > nd6_maxndopt) { 29107ba5f7cSjca icmp6stat_inc(icp6s_nd_toomanyopt); 292b79da24aSitojun nd6log((LOG_INFO, "too many loop in nd opt\n")); 293287546eaSitojun break; 294287546eaSitojun } 295287546eaSitojun 296287546eaSitojun if (ndopts->nd_opts_done) 297287546eaSitojun break; 298287546eaSitojun } 299287546eaSitojun 300287546eaSitojun return 0; 301287546eaSitojun } 302287546eaSitojun 303287546eaSitojun /* 3049631a17bSitojun * ND6 timer routine to handle ND6 entries 305287546eaSitojun */ 306287546eaSitojun void 307334bfa0aSmpi nd6_llinfo_settimer(struct llinfo_nd6 *ln, unsigned int secs) 3089631a17bSitojun { 3093209772dScheloha time_t expire = getuptime() + secs; 310334bfa0aSmpi 311334bfa0aSmpi NET_ASSERT_LOCKED(); 3129a2314e5Smpi KASSERT(!ISSET(ln->ln_rt->rt_flags, RTF_LOCAL)); 313334bfa0aSmpi 314334bfa0aSmpi ln->ln_rt->rt_expire = expire; 315334bfa0aSmpi if (!timeout_pending(&nd6_timer_to) || expire < nd6_timer_next) { 316334bfa0aSmpi nd6_timer_next = expire; 317334bfa0aSmpi timeout_add_sec(&nd6_timer_to, secs); 3189631a17bSitojun } 3199631a17bSitojun } 3209631a17bSitojun 321a0aa363cSjsing void 322334bfa0aSmpi nd6_timer(void *arg) 323287546eaSitojun { 324334bfa0aSmpi struct llinfo_nd6 *ln, *nln; 3253209772dScheloha time_t expire = getuptime() + nd6_gctimer; 326334bfa0aSmpi int secs; 327334bfa0aSmpi 328334bfa0aSmpi NET_LOCK(); 329334bfa0aSmpi TAILQ_FOREACH_SAFE(ln, &nd6_list, ln_list, nln) { 330334bfa0aSmpi struct rtentry *rt = ln->ln_rt; 331334bfa0aSmpi 3323209772dScheloha if (rt->rt_expire && rt->rt_expire <= getuptime()) 333334bfa0aSmpi if (nd6_llinfo_timer(rt)) 334334bfa0aSmpi continue; 335334bfa0aSmpi 336334bfa0aSmpi if (rt->rt_expire && rt->rt_expire < expire) 337334bfa0aSmpi expire = rt->rt_expire; 338334bfa0aSmpi } 339334bfa0aSmpi 3403209772dScheloha secs = expire - getuptime(); 341334bfa0aSmpi if (secs < 0) 342334bfa0aSmpi secs = 0; 343b089e30eSflorian if (!TAILQ_EMPTY(&nd6_list)) { 3443209772dScheloha nd6_timer_next = getuptime() + secs; 345334bfa0aSmpi timeout_add_sec(&nd6_timer_to, secs); 346b089e30eSflorian } 347334bfa0aSmpi 348334bfa0aSmpi NET_UNLOCK(); 349334bfa0aSmpi } 350334bfa0aSmpi 351334bfa0aSmpi /* 352334bfa0aSmpi * ND timer state handling. 353334bfa0aSmpi * 354334bfa0aSmpi * Returns 1 if `rt' should no longer be used, 0 otherwise. 355334bfa0aSmpi */ 356334bfa0aSmpi int 357334bfa0aSmpi nd6_llinfo_timer(struct rtentry *rt) 358334bfa0aSmpi { 359334bfa0aSmpi struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 360334bfa0aSmpi struct sockaddr_in6 *dst = satosin6(rt_key(rt)); 3619631a17bSitojun struct ifnet *ifp; 362d374aaacSitojun struct nd_ifinfo *ndi = NULL; 363287546eaSitojun 364334bfa0aSmpi NET_ASSERT_LOCKED(); 3659631a17bSitojun 366334bfa0aSmpi if ((ifp = if_get(rt->rt_ifidx)) == NULL) 367334bfa0aSmpi return 1; 3689631a17bSitojun 369d6b9e9b9Sitojun ndi = ND_IFINFO(ifp); 370287546eaSitojun 371287546eaSitojun switch (ln->ln_state) { 372287546eaSitojun case ND6_LLINFO_INCOMPLETE: 373287546eaSitojun if (ln->ln_asked < nd6_mmaxtries) { 374287546eaSitojun ln->ln_asked++; 375134b71fcSdlg nd6_llinfo_settimer(ln, ndi->retrans / 1000); 3769631a17bSitojun nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 377287546eaSitojun } else { 378287546eaSitojun struct mbuf *m = ln->ln_hold; 379287546eaSitojun if (m) { 3808294a4dfSitojun ln->ln_hold = NULL; 381287546eaSitojun /* 382d8a7e3a7Sitojun * Fake rcvif to make the ICMP error 383d8a7e3a7Sitojun * more helpful in diagnosing for the 384d8a7e3a7Sitojun * receiver. 385287546eaSitojun * XXX: should we consider 386287546eaSitojun * older rcvif? 387287546eaSitojun */ 38828112c65Smpi m->m_pkthdr.ph_ifidx = rt->rt_ifidx; 389d8a7e3a7Sitojun 390287546eaSitojun icmp6_error(m, ICMP6_DST_UNREACH, 391287546eaSitojun ICMP6_DST_UNREACH_ADDR, 0); 392e212adedSkrw if (ln->ln_hold == m) { 393e212adedSkrw /* m is back in ln_hold. Discard. */ 394e212adedSkrw m_freem(ln->ln_hold); 395e212adedSkrw ln->ln_hold = NULL; 396e212adedSkrw } 397287546eaSitojun } 39818e33022Sbluhm nd6_free(rt); 3999631a17bSitojun ln = NULL; 400287546eaSitojun } 401287546eaSitojun break; 402287546eaSitojun case ND6_LLINFO_REACHABLE: 4039631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 404287546eaSitojun ln->ln_state = ND6_LLINFO_STALE; 405134b71fcSdlg nd6_llinfo_settimer(ln, nd6_gctimer); 406be4e9e12Sitojun } 407287546eaSitojun break; 408be4e9e12Sitojun 409be4e9e12Sitojun case ND6_LLINFO_STALE: 410f3fcf2f3Smcbride case ND6_LLINFO_PURGE: 411be4e9e12Sitojun /* Garbage Collection(RFC 2461 5.3) */ 4129631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 41318e33022Sbluhm nd6_free(rt); 4149631a17bSitojun ln = NULL; 4159631a17bSitojun } 416be4e9e12Sitojun break; 417be4e9e12Sitojun 418287546eaSitojun case ND6_LLINFO_DELAY: 4190e39def2Sflorian if (ndi) { 420d374aaacSitojun /* We need NUD */ 421287546eaSitojun ln->ln_asked = 1; 422287546eaSitojun ln->ln_state = ND6_LLINFO_PROBE; 423134b71fcSdlg nd6_llinfo_settimer(ln, ndi->retrans / 1000); 424d374aaacSitojun nd6_ns_output(ifp, &dst->sin6_addr, 425d8a7e3a7Sitojun &dst->sin6_addr, ln, 0); 426be4e9e12Sitojun } 427287546eaSitojun break; 428287546eaSitojun case ND6_LLINFO_PROBE: 429287546eaSitojun if (ln->ln_asked < nd6_umaxtries) { 430287546eaSitojun ln->ln_asked++; 431134b71fcSdlg nd6_llinfo_settimer(ln, ndi->retrans / 1000); 432287546eaSitojun nd6_ns_output(ifp, &dst->sin6_addr, 433287546eaSitojun &dst->sin6_addr, ln, 0); 434d8a7e3a7Sitojun } else { 43518e33022Sbluhm nd6_free(rt); 4369631a17bSitojun ln = NULL; 437d8a7e3a7Sitojun } 438287546eaSitojun break; 439287546eaSitojun } 4409631a17bSitojun 441f5e0f62bSmpi if_put(ifp); 442334bfa0aSmpi 443334bfa0aSmpi return (ln == NULL); 444287546eaSitojun } 445287546eaSitojun 446c6bbd2a8Sflorian void 447c6bbd2a8Sflorian nd6_expire_timer_update(struct in6_ifaddr *ia6) 448c6bbd2a8Sflorian { 449c6bbd2a8Sflorian time_t expire_time = INT64_MAX; 450c6bbd2a8Sflorian int secs; 451c6bbd2a8Sflorian 452c6bbd2a8Sflorian KERNEL_ASSERT_LOCKED(); 453c6bbd2a8Sflorian 454c6bbd2a8Sflorian if (ia6->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) 455c6bbd2a8Sflorian expire_time = ia6->ia6_lifetime.ia6t_expire; 456c6bbd2a8Sflorian 457c6bbd2a8Sflorian if (!(ia6->ia6_flags & IN6_IFF_DEPRECATED) && 458c6bbd2a8Sflorian ia6->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME && 459c6bbd2a8Sflorian expire_time > ia6->ia6_lifetime.ia6t_preferred) 460c6bbd2a8Sflorian expire_time = ia6->ia6_lifetime.ia6t_preferred; 461c6bbd2a8Sflorian 462c6bbd2a8Sflorian if (expire_time == INT64_MAX) 463c6bbd2a8Sflorian return; 464c6bbd2a8Sflorian 465c6bbd2a8Sflorian /* 466c6bbd2a8Sflorian * IFA6_IS_INVALID() and IFA6_IS_DEPRECATED() check for uptime 467c6bbd2a8Sflorian * greater than ia6t_expire or ia6t_preferred, not greater or equal. 468c6bbd2a8Sflorian * Schedule timeout one second later so that either IFA6_IS_INVALID() 469c6bbd2a8Sflorian * or IFA6_IS_DEPRECATED() is true. 470c6bbd2a8Sflorian */ 471c6bbd2a8Sflorian expire_time++; 472c6bbd2a8Sflorian 473334bfa0aSmpi if (!timeout_pending(&nd6_expire_timeout) || 474334bfa0aSmpi nd6_expire_next > expire_time) { 4753209772dScheloha secs = expire_time - getuptime(); 476c6bbd2a8Sflorian if (secs < 0) 477c6bbd2a8Sflorian secs = 0; 478c6bbd2a8Sflorian 479c6bbd2a8Sflorian timeout_add_sec(&nd6_expire_timeout, secs); 480334bfa0aSmpi nd6_expire_next = expire_time; 481c6bbd2a8Sflorian } 482c6bbd2a8Sflorian } 483c6bbd2a8Sflorian 4849631a17bSitojun /* 485088d4855Smpi * Expire interface addresses. 4869631a17bSitojun */ 4879631a17bSitojun void 488088d4855Smpi nd6_expire(void *unused) 4899631a17bSitojun { 490a44d5cf0Smpi struct ifnet *ifp; 4919631a17bSitojun 492088d4855Smpi KERNEL_LOCK(); 493aa28b9a6Smpi NET_LOCK(); 49422e88dadSmpi 495a44d5cf0Smpi TAILQ_FOREACH(ifp, &ifnet, if_list) { 496a44d5cf0Smpi struct ifaddr *ifa, *nifa; 497a44d5cf0Smpi struct in6_ifaddr *ia6; 498a44d5cf0Smpi 499a44d5cf0Smpi TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrlist, ifa_list, nifa) { 500a44d5cf0Smpi if (ifa->ifa_addr->sa_family != AF_INET6) 501a44d5cf0Smpi continue; 502a44d5cf0Smpi ia6 = ifatoia6(ifa); 503d8a7e3a7Sitojun /* check address lifetime */ 504d8a7e3a7Sitojun if (IFA6_IS_INVALID(ia6)) { 505d8a7e3a7Sitojun in6_purgeaddr(&ia6->ia_ifa); 506d8a7e3a7Sitojun } else { 507c6bbd2a8Sflorian if (IFA6_IS_DEPRECATED(ia6)) 508c6bbd2a8Sflorian ia6->ia6_flags |= IN6_IFF_DEPRECATED; 509c6bbd2a8Sflorian nd6_expire_timer_update(ia6); 510d8a7e3a7Sitojun } 511d8a7e3a7Sitojun } 512a44d5cf0Smpi } 513d8a7e3a7Sitojun 514aa28b9a6Smpi NET_UNLOCK(); 515088d4855Smpi KERNEL_UNLOCK(); 516287546eaSitojun } 517287546eaSitojun 518a09574ebSkettenis void 519088d4855Smpi nd6_expire_timer(void *unused) 520a09574ebSkettenis { 52193865884Ssashan task_add(net_tq(0), &nd6_expire_task); 522a09574ebSkettenis } 523a09574ebSkettenis 52422770369Sitojun /* 52522770369Sitojun * Nuke neighbor cache/prefix/default router management table, right before 52622770369Sitojun * ifp goes away. 52722770369Sitojun */ 52822770369Sitojun void 529ee37ea65Smcbride nd6_purge(struct ifnet *ifp) 53022770369Sitojun { 53122770369Sitojun struct llinfo_nd6 *ln, *nln; 53222770369Sitojun 53366736630Smpi NET_ASSERT_LOCKED(); 53445ffa37bSmpi 53522770369Sitojun /* 53622770369Sitojun * Nuke neighbor cache entries for the ifp. 53722770369Sitojun */ 53892c821ddSbluhm TAILQ_FOREACH_SAFE(ln, &nd6_list, ln_list, nln) { 53922770369Sitojun struct rtentry *rt; 54022770369Sitojun struct sockaddr_dl *sdl; 54122770369Sitojun 54222770369Sitojun rt = ln->ln_rt; 54392c821ddSbluhm if (rt != NULL && rt->rt_gateway != NULL && 54422770369Sitojun rt->rt_gateway->sa_family == AF_LINK) { 545c7b7b779Sbluhm sdl = satosdl(rt->rt_gateway); 54622770369Sitojun if (sdl->sdl_index == ifp->if_index) 54718e33022Sbluhm nd6_free(rt); 54822770369Sitojun } 54922770369Sitojun } 55022770369Sitojun } 55122770369Sitojun 552287546eaSitojun struct rtentry * 553f4d1af37Smikeb nd6_lookup(struct in6_addr *addr6, int create, struct ifnet *ifp, 554f4d1af37Smikeb u_int rtableid) 555287546eaSitojun { 556287546eaSitojun struct rtentry *rt; 557287546eaSitojun struct sockaddr_in6 sin6; 5585148b194Smpi int flags; 559287546eaSitojun 560287546eaSitojun bzero(&sin6, sizeof(sin6)); 561287546eaSitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 562287546eaSitojun sin6.sin6_family = AF_INET6; 563287546eaSitojun sin6.sin6_addr = *addr6; 56412d3c25cSclaudio flags = (create) ? RT_RESOLVE : 0; 565d8a7e3a7Sitojun 5665148b194Smpi rt = rtalloc(sin6tosa(&sin6), flags, rtableid); 56716119bbfSmpi if (rt != NULL && (rt->rt_flags & RTF_LLINFO) == 0) { 568287546eaSitojun /* 569287546eaSitojun * This is the case for the default route. 570287546eaSitojun * If we want to create a neighbor cache for the address, we 571287546eaSitojun * should free the route for the destination and allocate an 572287546eaSitojun * interface route. 573287546eaSitojun */ 574287546eaSitojun if (create) { 57527ae666cSmpi rtfree(rt); 57627ae666cSmpi rt = NULL; 577287546eaSitojun } 578287546eaSitojun } 57916119bbfSmpi if (rt == NULL) { 580287546eaSitojun if (create && ifp) { 581cb24f5e5Sclaudio struct rt_addrinfo info; 58266f69fe1Smpi struct ifaddr *ifa; 5830ffd01d4Sbluhm int error; 584d374aaacSitojun 585287546eaSitojun /* 586287546eaSitojun * If no route is available and create is set, 587287546eaSitojun * we allocate a host route for the destination 588287546eaSitojun * and treat it like an interface route. 589287546eaSitojun * This hack is necessary for a neighbor which can't 590287546eaSitojun * be covered by our own prefix. 591287546eaSitojun */ 59266f69fe1Smpi ifa = ifaof_ifpforaddr(sin6tosa(&sin6), ifp); 593287546eaSitojun if (ifa == NULL) 594287546eaSitojun return (NULL); 595287546eaSitojun 596287546eaSitojun /* 597287546eaSitojun * Create a new route. RTF_LLINFO is necessary 598287546eaSitojun * to create a Neighbor Cache entry for the 599287546eaSitojun * destination in nd6_rtrequest which will be 6007ffb277fSbluhm * called in rtrequest. 601287546eaSitojun */ 602cb24f5e5Sclaudio bzero(&info, sizeof(info)); 60366f69fe1Smpi info.rti_ifa = ifa; 604c29fc46aSmpi info.rti_flags = RTF_HOST | RTF_LLINFO; 605c3c56496Sbluhm info.rti_info[RTAX_DST] = sin6tosa(&sin6); 606c7b7b779Sbluhm info.rti_info[RTAX_GATEWAY] = sdltosa(ifp->if_sadl); 6077ffb277fSbluhm error = rtrequest(RTM_ADD, &info, RTP_CONNECTED, &rt, 6080ffd01d4Sbluhm rtableid); 6090ffd01d4Sbluhm if (error) 610287546eaSitojun return (NULL); 6119c0643cdSbluhm if (rt->rt_llinfo != NULL) { 612287546eaSitojun struct llinfo_nd6 *ln = 613287546eaSitojun (struct llinfo_nd6 *)rt->rt_llinfo; 614287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 615287546eaSitojun } 616f6e55599Sitojun } else 617287546eaSitojun return (NULL); 618287546eaSitojun } 619287546eaSitojun /* 620287546eaSitojun * Validation for the entry. 621d8a7e3a7Sitojun * Note that the check for rt_llinfo is necessary because a cloned 622d8a7e3a7Sitojun * route from a parent route that has the L flag (e.g. the default 623d8a7e3a7Sitojun * route to a p2p interface) may have the flag, too, while the 624d8a7e3a7Sitojun * destination is not actually a neighbor. 625287546eaSitojun */ 626287546eaSitojun if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 || 627d8a7e3a7Sitojun rt->rt_gateway->sa_family != AF_LINK || rt->rt_llinfo == NULL || 628248f6870Smpi (ifp != NULL && rt->rt_ifidx != ifp->if_index)) { 629287546eaSitojun if (create) { 630bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 63135075f95Smpi nd6log((LOG_DEBUG, "%s: failed to lookup %s (if=%s)\n", 63235075f95Smpi __func__, 633bbcf0337Smpi inet_ntop(AF_INET6, addr6, addr, sizeof(addr)), 634da592434Sitojun ifp ? ifp->if_xname : "unspec")); 635287546eaSitojun } 63616119bbfSmpi rtfree(rt); 637d8a7e3a7Sitojun return (NULL); 638287546eaSitojun } 639287546eaSitojun return (rt); 640287546eaSitojun } 641287546eaSitojun 642287546eaSitojun /* 643287546eaSitojun * Detect if a given IPv6 address identifies a neighbor on a given link. 644287546eaSitojun * XXX: should take care of the destination of a p2p link? 645287546eaSitojun */ 646287546eaSitojun int 647ee37ea65Smcbride nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp) 648287546eaSitojun { 649ef6620bcSmpi struct in6_ifaddr *ia6; 650ef6620bcSmpi struct ifaddr *ifa; 651d8a7e3a7Sitojun struct rtentry *rt; 652287546eaSitojun 653cfb6b8dfSitojun /* 654cfb6b8dfSitojun * A link-local address is always a neighbor. 655cfb6b8dfSitojun * XXX: we should use the sin6_scope_id field rather than the embedded 656cfb6b8dfSitojun * interface index. 657d8a7e3a7Sitojun * XXX: a link does not necessarily specify a single interface. 658cfb6b8dfSitojun */ 659cfb6b8dfSitojun if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) && 660cfb6b8dfSitojun ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index) 661287546eaSitojun return (1); 662287546eaSitojun 663ef6620bcSmpi TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 664ef6620bcSmpi if (ifa->ifa_addr->sa_family != AF_INET6) 665ef6620bcSmpi continue; 666ef6620bcSmpi 667ef6620bcSmpi ia6 = ifatoia6(ifa); 668ef6620bcSmpi 669ef6620bcSmpi /* Prefix check down below. */ 670ef6620bcSmpi if (ia6->ia6_flags & IN6_IFF_AUTOCONF) 671ef6620bcSmpi continue; 672ef6620bcSmpi 673ef6620bcSmpi if (IN6_ARE_MASKED_ADDR_EQUAL(&addr->sin6_addr, 674ef6620bcSmpi &ia6->ia_addr.sin6_addr, 675ef6620bcSmpi &ia6->ia_prefixmask.sin6_addr)) 676ef6620bcSmpi return (1); 677ef6620bcSmpi } 678ef6620bcSmpi 679287546eaSitojun /* 680287546eaSitojun * Even if the address matches none of our addresses, it might be 681287546eaSitojun * in the neighbor cache. 682287546eaSitojun */ 68316119bbfSmpi rt = nd6_lookup(&addr->sin6_addr, 0, ifp, ifp->if_rdomain); 68416119bbfSmpi if (rt != NULL) { 68516119bbfSmpi rtfree(rt); 686287546eaSitojun return (1); 68716119bbfSmpi } 688287546eaSitojun 689287546eaSitojun return (0); 690287546eaSitojun } 691287546eaSitojun 692c370e97fSmpi void 693c370e97fSmpi nd6_invalidate(struct rtentry *rt) 694c370e97fSmpi { 695c370e97fSmpi struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 6966143f866Sflorian struct sockaddr_dl *sdl = satosdl(rt->rt_gateway); 697c370e97fSmpi 698c370e97fSmpi m_freem(ln->ln_hold); 6996143f866Sflorian sdl->sdl_alen = 0; 700c370e97fSmpi ln->ln_hold = NULL; 701c370e97fSmpi ln->ln_state = ND6_LLINFO_INCOMPLETE; 702c370e97fSmpi ln->ln_asked = 0; 703c370e97fSmpi } 704c370e97fSmpi 705287546eaSitojun /* 706287546eaSitojun * Free an nd6 llinfo entry. 707d8a7e3a7Sitojun * Since the function would cause significant changes in the kernel, DO NOT 708d8a7e3a7Sitojun * make it global, unless you have a strong reason for the change, and are sure 709d8a7e3a7Sitojun * that the change is safe. 710287546eaSitojun */ 71118e33022Sbluhm void 71218e33022Sbluhm nd6_free(struct rtentry *rt) 713287546eaSitojun { 71418e33022Sbluhm struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 715c3c56496Sbluhm struct in6_addr in6 = satosin6(rt_key(rt))->sin6_addr; 716248f6870Smpi struct ifnet *ifp; 71745ffa37bSmpi 71866736630Smpi NET_ASSERT_LOCKED(); 719287546eaSitojun 720248f6870Smpi ifp = if_get(rt->rt_ifidx); 721f4f4d166Sitojun 72281d38878Smpi if (!ip6_forwarding) { 7234a2f474dSflorian if (ln->ln_router) { 724f4f4d166Sitojun /* 725f4f4d166Sitojun * rt6_flush must be called whether or not the neighbor 726f4f4d166Sitojun * is in the Default Router List. 727f4f4d166Sitojun * See a corresponding comment in nd6_na_input(). 728f4f4d166Sitojun */ 729248f6870Smpi rt6_flush(&in6, ifp); 730f4f4d166Sitojun } 731287546eaSitojun } 732287546eaSitojun 7336348db95Sbluhm KASSERT(!ISSET(rt->rt_flags, RTF_LOCAL)); 7344dfec2cfSmpi nd6_invalidate(rt); 7354dfec2cfSmpi 73629760ae1Sitojun /* 73729760ae1Sitojun * Detach the route from the routing tree and the list of neighbor 73829760ae1Sitojun * caches, and disable the route entry not to be used in already 73929760ae1Sitojun * cached routes. 74029760ae1Sitojun */ 741c370e97fSmpi if (!ISSET(rt->rt_flags, RTF_STATIC|RTF_CACHED)) 742c4cbcae8Sbluhm rtdeletemsg(rt, ifp, ifp->if_rdomain); 74329760ae1Sitojun 744248f6870Smpi if_put(ifp); 745287546eaSitojun } 746287546eaSitojun 747287546eaSitojun /* 748287546eaSitojun * Upper-layer reachability hint for Neighbor Unreachability Detection. 749287546eaSitojun * 7508b542bbeSpascoe * XXX cost-effective methods? 751287546eaSitojun */ 752287546eaSitojun void 753a7fa3e84Smpi nd6_nud_hint(struct rtentry *rt) 754287546eaSitojun { 755287546eaSitojun struct llinfo_nd6 *ln; 756a7fa3e84Smpi struct ifnet *ifp; 757287546eaSitojun 758a7fa3e84Smpi ifp = if_get(rt->rt_ifidx); 759a7fa3e84Smpi if (ifp == NULL) 760287546eaSitojun return; 761287546eaSitojun 762f6e55599Sitojun if ((rt->rt_flags & RTF_GATEWAY) != 0 || 763f6e55599Sitojun (rt->rt_flags & RTF_LLINFO) == 0 || 7649c0643cdSbluhm rt->rt_llinfo == NULL || rt->rt_gateway == NULL || 765f6e55599Sitojun rt->rt_gateway->sa_family != AF_LINK) { 766287546eaSitojun /* This is not a host route. */ 767a7fa3e84Smpi goto out; 768287546eaSitojun } 769287546eaSitojun 770287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 771804d8827Sitojun if (ln->ln_state < ND6_LLINFO_REACHABLE) 772a7fa3e84Smpi goto out; 773287546eaSitojun 774f6e55599Sitojun /* 775f6e55599Sitojun * if we get upper-layer reachability confirmation many times, 776f6e55599Sitojun * it is possible we have false information. 777f6e55599Sitojun */ 778f6e55599Sitojun ln->ln_byhint++; 779f6e55599Sitojun if (ln->ln_byhint > nd6_maxnudhint) 780a7fa3e84Smpi goto out; 781f6e55599Sitojun 782287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 783a7fa3e84Smpi if (!ND6_LLINFO_PERMANENT(ln)) 784134b71fcSdlg nd6_llinfo_settimer(ln, ND_IFINFO(ifp)->reachable); 785a7fa3e84Smpi out: 786a7fa3e84Smpi if_put(ifp); 787287546eaSitojun } 788287546eaSitojun 789287546eaSitojun void 790dcb17c31Smpi nd6_rtrequest(struct ifnet *ifp, int req, struct rtentry *rt) 791287546eaSitojun { 792287546eaSitojun struct sockaddr *gate = rt->rt_gateway; 793287546eaSitojun struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 794287546eaSitojun struct ifaddr *ifa; 795*7e3957d1Sbluhm struct in6_ifaddr *ifa6; 796287546eaSitojun 7974cb08838Sclaudio if (ISSET(rt->rt_flags, RTF_GATEWAY|RTF_MULTICAST|RTF_MPLS)) 798287546eaSitojun return; 799287546eaSitojun 800d8a7e3a7Sitojun if (nd6_need_cache(ifp) == 0 && (rt->rt_flags & RTF_HOST) == 0) { 801d8a7e3a7Sitojun /* 802d8a7e3a7Sitojun * This is probably an interface direct route for a link 803d8a7e3a7Sitojun * which does not need neighbor caches (e.g. fe80::%lo0/64). 804d8a7e3a7Sitojun * We do not need special treatment below for such a route. 805d8a7e3a7Sitojun * Moreover, the RTF_LLINFO flag which would be set below 806d8a7e3a7Sitojun * would annoy the ndp(8) command. 807d8a7e3a7Sitojun */ 808d8a7e3a7Sitojun return; 809d8a7e3a7Sitojun } 810d8a7e3a7Sitojun 811af1344beSbluhm if (req == RTM_RESOLVE && nd6_need_cache(ifp) == 0) { 812d8a7e3a7Sitojun /* 813af1344beSbluhm * For routing daemons like ospf6d we allow neighbor discovery 814af1344beSbluhm * based on the cloning route only. This allows us to sent 815af1344beSbluhm * packets directly into a network without having an address 816af1344beSbluhm * with matching prefix on the interface. If the cloning 817af1344beSbluhm * route is used for an stf interface, we would mistakenly 818af1344beSbluhm * make a neighbor cache for the host route, and would see 819af1344beSbluhm * strange neighbor solicitation for the corresponding 820af1344beSbluhm * destination. In order to avoid confusion, we check if the 821af1344beSbluhm * interface is suitable for neighbor discovery, and stop the 822d8a7e3a7Sitojun * process if not. Additionally, we remove the LLINFO flag 823d8a7e3a7Sitojun * so that ndp(8) will not try to get the neighbor information 824d8a7e3a7Sitojun * of the destination. 825d8a7e3a7Sitojun */ 826d8a7e3a7Sitojun rt->rt_flags &= ~RTF_LLINFO; 827d8a7e3a7Sitojun return; 828d8a7e3a7Sitojun } 829d8a7e3a7Sitojun 830287546eaSitojun switch (req) { 831287546eaSitojun case RTM_ADD: 83248ebf8e1Sitojun if ((rt->rt_flags & RTF_CLONING) || 8339c0643cdSbluhm ((rt->rt_flags & (RTF_LLINFO | RTF_LOCAL)) && ln == NULL)) { 8349c0643cdSbluhm if (ln != NULL) 8359631a17bSitojun nd6_llinfo_settimer(ln, 0); 836d8a7e3a7Sitojun if ((rt->rt_flags & RTF_CLONING) != 0) 837287546eaSitojun break; 838287546eaSitojun } 839f4f4d166Sitojun /* 8408b542bbeSpascoe * In IPv4 code, we try to announce new RTF_ANNOUNCE entry here. 841f4f4d166Sitojun * We don't do that here since llinfo is not ready yet. 842f4f4d166Sitojun * 843f4f4d166Sitojun * There are also couple of other things to be discussed: 844f4f4d166Sitojun * - unsolicited NA code needs improvement beforehand 845f4f4d166Sitojun * - RFC2461 says we MAY send multicast unsolicited NA 846f4f4d166Sitojun * (7.2.6 paragraph 4), however, it also says that we 847f4f4d166Sitojun * SHOULD provide a mechanism to prevent multicast NA storm. 848f4f4d166Sitojun * we don't have anything like it right now. 849841d7adbSitojun * note that the mechanism needs a mutual agreement 850f4f4d166Sitojun * between proxies, which means that we need to implement 851841d7adbSitojun * a new protocol, or a new kludge. 852841d7adbSitojun * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA. 853f4f4d166Sitojun * we need to check ip6forwarding before sending it. 854f4f4d166Sitojun * (or should we allow proxy ND configuration only for 855f4f4d166Sitojun * routers? there's no mention about proxy ND from hosts) 856f4f4d166Sitojun */ 857f4f4d166Sitojun #if 0 858f4f4d166Sitojun /* XXX it does not work */ 859287546eaSitojun if (rt->rt_flags & RTF_ANNOUNCE) 860287546eaSitojun nd6_na_output(ifp, 861c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr, 862c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr, 863287546eaSitojun ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, 864f4f4d166Sitojun 1, NULL); 865f4f4d166Sitojun #endif 866287546eaSitojun /* FALLTHROUGH */ 867287546eaSitojun case RTM_RESOLVE: 868287546eaSitojun if (gate->sa_family != AF_LINK || 869cfc71c8bSclaudio gate->sa_len < sizeof(struct sockaddr_dl)) { 87086b61919Smpi log(LOG_DEBUG, "%s: bad gateway value: %s\n", 87186b61919Smpi __func__, ifp->if_xname); 872287546eaSitojun break; 873287546eaSitojun } 874c7b7b779Sbluhm satosdl(gate)->sdl_type = ifp->if_type; 875c7b7b779Sbluhm satosdl(gate)->sdl_index = ifp->if_index; 876d374aaacSitojun if (ln != NULL) 877287546eaSitojun break; /* This happens on a route change */ 878287546eaSitojun /* 879287546eaSitojun * Case 2: This route may come from cloning, or a manual route 880287546eaSitojun * add with a LL address. 881287546eaSitojun */ 88293fbd125Sbluhm ln = pool_get(&nd6_pool, PR_NOWAIT | PR_ZERO); 883287546eaSitojun rt->rt_llinfo = (caddr_t)ln; 8849c0643cdSbluhm if (ln == NULL) { 88593fbd125Sbluhm log(LOG_DEBUG, "%s: pool get failed\n", __func__); 886287546eaSitojun break; 887287546eaSitojun } 888287546eaSitojun nd6_inuse++; 889287546eaSitojun nd6_allocated++; 890287546eaSitojun ln->ln_rt = rt; 891287546eaSitojun /* this is required for "ndp" command. - shin */ 892287546eaSitojun if (req == RTM_ADD) { 893287546eaSitojun /* 894287546eaSitojun * gate should have some valid AF_LINK entry, 8953bc414e3Sdlg * and ln expire should have some lifetime 896287546eaSitojun * which is specified by ndp command. 897287546eaSitojun */ 898287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 899f6e55599Sitojun ln->ln_byhint = 0; 900287546eaSitojun } else { 901287546eaSitojun /* 902287546eaSitojun * When req == RTM_RESOLVE, rt is created and 903287546eaSitojun * initialized in rtrequest(), so rt_expire is 0. 904287546eaSitojun */ 905287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 9069631a17bSitojun nd6_llinfo_settimer(ln, 0); 907287546eaSitojun } 908287546eaSitojun rt->rt_flags |= RTF_LLINFO; 90992c821ddSbluhm TAILQ_INSERT_HEAD(&nd6_list, ln, ln_list); 910287546eaSitojun 911287546eaSitojun /* 912f3fcf2f3Smcbride * If we have too many cache entries, initiate immediate 913f3fcf2f3Smcbride * purging for some "less recently used" entries. Note that 914f3fcf2f3Smcbride * we cannot directly call nd6_free() here because it would 915f3fcf2f3Smcbride * cause re-entering rtable related routines triggering an LOR 916f3fcf2f3Smcbride * problem for FreeBSD. 917f3fcf2f3Smcbride */ 918f3fcf2f3Smcbride if (ip6_neighborgcthresh >= 0 && 919f3fcf2f3Smcbride nd6_inuse >= ip6_neighborgcthresh) { 920f3fcf2f3Smcbride int i; 921f3fcf2f3Smcbride 92292c821ddSbluhm for (i = 0; i < 10; i++) { 92392c821ddSbluhm struct llinfo_nd6 *ln_end; 92492c821ddSbluhm 92592c821ddSbluhm ln_end = TAILQ_LAST(&nd6_list, llinfo_nd6_head); 92692c821ddSbluhm if (ln_end == ln) 92792c821ddSbluhm break; 928f3fcf2f3Smcbride 929f3fcf2f3Smcbride /* Move this entry to the head */ 93092c821ddSbluhm TAILQ_REMOVE(&nd6_list, ln_end, ln_list); 93192c821ddSbluhm TAILQ_INSERT_HEAD(&nd6_list, ln_end, ln_list); 932f3fcf2f3Smcbride 933f3fcf2f3Smcbride if (ND6_LLINFO_PERMANENT(ln_end)) 934f3fcf2f3Smcbride continue; 935f3fcf2f3Smcbride 936f3fcf2f3Smcbride if (ln_end->ln_state > ND6_LLINFO_INCOMPLETE) 937f3fcf2f3Smcbride ln_end->ln_state = ND6_LLINFO_STALE; 938f3fcf2f3Smcbride else 939f3fcf2f3Smcbride ln_end->ln_state = ND6_LLINFO_PURGE; 940f3fcf2f3Smcbride nd6_llinfo_settimer(ln_end, 0); 941f3fcf2f3Smcbride } 942f3fcf2f3Smcbride } 943f3fcf2f3Smcbride 944f3fcf2f3Smcbride /* 945287546eaSitojun * check if rt_key(rt) is one of my address assigned 946287546eaSitojun * to the interface. 947287546eaSitojun */ 948*7e3957d1Sbluhm ifa6 = in6ifa_ifpwithaddr(ifp, 949*7e3957d1Sbluhm &satosin6(rt_key(rt))->sin6_addr); 950*7e3957d1Sbluhm ifa = ifa6 ? &ifa6->ia_ifa : NULL; 951287546eaSitojun if (ifa) { 952287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 953f6e55599Sitojun ln->ln_byhint = 0; 954334bfa0aSmpi rt->rt_expire = 0; 955fac399ceSmpi KASSERT(ifa == rt->rt_ifa); 956f4f4d166Sitojun } else if (rt->rt_flags & RTF_ANNOUNCE) { 957f4f4d166Sitojun ln->ln_state = ND6_LLINFO_REACHABLE; 958f6e55599Sitojun ln->ln_byhint = 0; 959334bfa0aSmpi rt->rt_expire = 0; 960f4f4d166Sitojun 961f4f4d166Sitojun /* join solicited node multicast for proxy ND */ 962f4f4d166Sitojun if (ifp->if_flags & IFF_MULTICAST) { 963f4f4d166Sitojun struct in6_addr llsol; 964f4f4d166Sitojun int error; 965f4f4d166Sitojun 966c3c56496Sbluhm llsol = satosin6(rt_key(rt))->sin6_addr; 967f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 968f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 969f4f4d166Sitojun llsol.s6_addr32[1] = 0; 970f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 971f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 972f4f4d166Sitojun 973d8a7e3a7Sitojun if (in6_addmulti(&llsol, ifp, &error)) { 974bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 975d8a7e3a7Sitojun nd6log((LOG_ERR, "%s: failed to join " 976d8a7e3a7Sitojun "%s (errno=%d)\n", ifp->if_xname, 977bbcf0337Smpi inet_ntop(AF_INET6, &llsol, 978bbcf0337Smpi addr, sizeof(addr)), 979bbcf0337Smpi error)); 980d8a7e3a7Sitojun } 981f4f4d166Sitojun } 982287546eaSitojun } 983287546eaSitojun break; 984287546eaSitojun 985287546eaSitojun case RTM_DELETE: 9869c0643cdSbluhm if (ln == NULL) 987287546eaSitojun break; 988f4f4d166Sitojun /* leave from solicited node multicast for proxy ND */ 989f4f4d166Sitojun if ((rt->rt_flags & RTF_ANNOUNCE) != 0 && 990f4f4d166Sitojun (ifp->if_flags & IFF_MULTICAST) != 0) { 991f4f4d166Sitojun struct in6_addr llsol; 992f4f4d166Sitojun struct in6_multi *in6m; 993f4f4d166Sitojun 994c3c56496Sbluhm llsol = satosin6(rt_key(rt))->sin6_addr; 995f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 996f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 997f4f4d166Sitojun llsol.s6_addr32[1] = 0; 998f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 999f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 1000f4f4d166Sitojun 1001f4f4d166Sitojun IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1002f4f4d166Sitojun if (in6m) 1003f4f4d166Sitojun in6_delmulti(in6m); 1004f4f4d166Sitojun } 1005287546eaSitojun nd6_inuse--; 100692c821ddSbluhm TAILQ_REMOVE(&nd6_list, ln, ln_list); 1007334bfa0aSmpi rt->rt_expire = 0; 10089c0643cdSbluhm rt->rt_llinfo = NULL; 1009287546eaSitojun rt->rt_flags &= ~RTF_LLINFO; 1010287546eaSitojun m_freem(ln->ln_hold); 101193fbd125Sbluhm pool_put(&nd6_pool, ln); 1012c370e97fSmpi break; 1013c370e97fSmpi 1014c370e97fSmpi case RTM_INVALIDATE: 1015b5675ff3Skrw if (ln == NULL) 1016b5675ff3Skrw break; 1017ad57c59cSbluhm if (!ISSET(rt->rt_flags, RTF_LOCAL)) 1018c370e97fSmpi nd6_invalidate(rt); 1019c370e97fSmpi break; 1020287546eaSitojun } 1021287546eaSitojun } 1022287546eaSitojun 1023287546eaSitojun int 1024ee37ea65Smcbride nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp) 1025287546eaSitojun { 1026287546eaSitojun struct in6_ndireq *ndi = (struct in6_ndireq *)data; 1027287546eaSitojun struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data; 1028287546eaSitojun struct rtentry *rt; 1029287546eaSitojun 1030287546eaSitojun switch (cmd) { 1031d6b9e9b9Sitojun case SIOCGIFINFO_IN6: 10324d5cbc65Smpi NET_RLOCK_IN_IOCTL(); 1033d6b9e9b9Sitojun ndi->ndi = *ND_IFINFO(ifp); 10344d5cbc65Smpi NET_RUNLOCK_IN_IOCTL(); 1035dd66399bStb return (0); 1036287546eaSitojun case SIOCGNBRINFO_IN6: 1037287546eaSitojun { 1038287546eaSitojun struct llinfo_nd6 *ln; 1039287546eaSitojun struct in6_addr nb_addr = nbi->addr; /* make local for safety */ 1040f303499dSdlg time_t expire; 1041287546eaSitojun 10424d5cbc65Smpi NET_RLOCK_IN_IOCTL(); 1043287546eaSitojun /* 1044287546eaSitojun * XXX: KAME specific hack for scoped addresses 1045287546eaSitojun * XXXX: for other scopes than link-local? 1046287546eaSitojun */ 1047287546eaSitojun if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) || 1048287546eaSitojun IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) { 1049287546eaSitojun u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2]; 1050287546eaSitojun 1051287546eaSitojun if (*idp == 0) 1052287546eaSitojun *idp = htons(ifp->if_index); 1053287546eaSitojun } 1054287546eaSitojun 105516119bbfSmpi rt = nd6_lookup(&nb_addr, 0, ifp, ifp->if_rdomain); 105616119bbfSmpi if (rt == NULL || 1057d8a7e3a7Sitojun (ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) { 105816119bbfSmpi rtfree(rt); 10594d5cbc65Smpi NET_RUNLOCK_IN_IOCTL(); 1060dd66399bStb return (EINVAL); 1061287546eaSitojun } 10623bc414e3Sdlg expire = ln->ln_rt->rt_expire; 1063f303499dSdlg if (expire != 0) { 10643209772dScheloha expire -= getuptime(); 10653209772dScheloha expire += gettime(); 1066f303499dSdlg } 1067f303499dSdlg 1068287546eaSitojun nbi->state = ln->ln_state; 1069287546eaSitojun nbi->asked = ln->ln_asked; 1070287546eaSitojun nbi->isrouter = ln->ln_router; 1071f303499dSdlg nbi->expire = expire; 1072287546eaSitojun 1073dd66399bStb rtfree(rt); 10744d5cbc65Smpi NET_RUNLOCK_IN_IOCTL(); 1075dd66399bStb return (0); 1076287546eaSitojun } 1077287546eaSitojun } 1078dd66399bStb return (0); 1079287546eaSitojun } 1080287546eaSitojun 1081287546eaSitojun /* 1082287546eaSitojun * Create neighbor cache entry and cache link-layer address, 1083287546eaSitojun * on reception of inbound ND6 packets. (RS/RA/NS/redirect) 1084ee37ea65Smcbride * 1085ee37ea65Smcbride * type - ICMP6 type 1086ee37ea65Smcbride * code - type dependent information 1087287546eaSitojun */ 1088db435b2aSmpi void 1089ee37ea65Smcbride nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr, 1090ee37ea65Smcbride int lladdrlen, int type, int code) 1091287546eaSitojun { 1092287546eaSitojun struct rtentry *rt = NULL; 1093287546eaSitojun struct llinfo_nd6 *ln = NULL; 1094287546eaSitojun int is_newentry; 1095287546eaSitojun struct sockaddr_dl *sdl = NULL; 1096287546eaSitojun int do_update; 1097287546eaSitojun int olladdr; 1098287546eaSitojun int llchange; 1099287546eaSitojun int newstate = 0; 1100287546eaSitojun 1101287546eaSitojun if (!ifp) 1102ab0ea4a9Snayden panic("%s: ifp == NULL", __func__); 1103287546eaSitojun if (!from) 1104ab0ea4a9Snayden panic("%s: from == NULL", __func__); 1105287546eaSitojun 1106287546eaSitojun /* nothing must be updated for unspecified address */ 1107287546eaSitojun if (IN6_IS_ADDR_UNSPECIFIED(from)) 1108db435b2aSmpi return; 1109287546eaSitojun 1110287546eaSitojun /* 1111287546eaSitojun * Validation about ifp->if_addrlen and lladdrlen must be done in 1112287546eaSitojun * the caller. 1113287546eaSitojun * 11148b542bbeSpascoe * XXX If the link does not have link-layer address, what should 1115287546eaSitojun * we do? (ifp->if_addrlen == 0) 1116287546eaSitojun * Spec says nothing in sections for RA, RS and NA. There's small 1117287546eaSitojun * description on it in NS section (RFC 2461 7.2.3). 1118287546eaSitojun */ 1119287546eaSitojun 1120f4d1af37Smikeb rt = nd6_lookup(from, 0, ifp, ifp->if_rdomain); 112116119bbfSmpi if (rt == NULL) { 11225148b194Smpi rt = nd6_lookup(from, 1, ifp, ifp->if_rdomain); 1123287546eaSitojun is_newentry = 1; 11240a2c5741Sitojun } else { 11258e6c5245Smpi /* do not overwrite local or static entry */ 11268e6c5245Smpi if (ISSET(rt->rt_flags, RTF_STATIC|RTF_LOCAL)) { 112716119bbfSmpi rtfree(rt); 1128db435b2aSmpi return; 112916119bbfSmpi } 1130287546eaSitojun is_newentry = 0; 11310a2c5741Sitojun } 1132287546eaSitojun 1133287546eaSitojun if (!rt) 1134db435b2aSmpi return; 1135287546eaSitojun if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) { 1136287546eaSitojun fail: 113718e33022Sbluhm nd6_free(rt); 113816119bbfSmpi rtfree(rt); 1139db435b2aSmpi return; 1140287546eaSitojun } 1141287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 11429c0643cdSbluhm if (ln == NULL) 1143287546eaSitojun goto fail; 11449c0643cdSbluhm if (rt->rt_gateway == NULL) 1145287546eaSitojun goto fail; 1146287546eaSitojun if (rt->rt_gateway->sa_family != AF_LINK) 1147287546eaSitojun goto fail; 1148c7b7b779Sbluhm sdl = satosdl(rt->rt_gateway); 1149287546eaSitojun 1150287546eaSitojun olladdr = (sdl->sdl_alen) ? 1 : 0; 1151287546eaSitojun if (olladdr && lladdr) { 1152287546eaSitojun if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 1153287546eaSitojun llchange = 1; 1154287546eaSitojun else 1155287546eaSitojun llchange = 0; 1156287546eaSitojun } else 1157287546eaSitojun llchange = 0; 1158287546eaSitojun 1159287546eaSitojun /* 1160287546eaSitojun * newentry olladdr lladdr llchange (*=record) 1161287546eaSitojun * 0 n n -- (1) 1162287546eaSitojun * 0 y n -- (2) 1163287546eaSitojun * 0 n y -- (3) * STALE 1164287546eaSitojun * 0 y y n (4) * 1165287546eaSitojun * 0 y y y (5) * STALE 1166287546eaSitojun * 1 -- n -- (6) NOSTATE(= PASSIVE) 1167287546eaSitojun * 1 -- y -- (7) * STALE 1168287546eaSitojun */ 1169287546eaSitojun 1170c8a7c9e3Sbluhm if (llchange) { 1171bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 1172c8a7c9e3Sbluhm log(LOG_INFO, "ndp info overwritten for %s by %s on %s\n", 1173bbcf0337Smpi inet_ntop(AF_INET6, from, addr, sizeof(addr)), 1174bbcf0337Smpi ether_sprintf(lladdr), ifp->if_xname); 1175c8a7c9e3Sbluhm } 1176287546eaSitojun if (lladdr) { /* (3-5) and (7) */ 1177287546eaSitojun /* 1178287546eaSitojun * Record source link-layer address 1179287546eaSitojun * XXX is it dependent to ifp->if_type? 1180287546eaSitojun */ 1181287546eaSitojun sdl->sdl_alen = ifp->if_addrlen; 1182287546eaSitojun bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 1183287546eaSitojun } 1184287546eaSitojun 1185287546eaSitojun if (!is_newentry) { 1186d8a7e3a7Sitojun if ((!olladdr && lladdr) || /* (3) */ 1187d8a7e3a7Sitojun (olladdr && lladdr && llchange)) { /* (5) */ 1188287546eaSitojun do_update = 1; 1189287546eaSitojun newstate = ND6_LLINFO_STALE; 1190287546eaSitojun } else /* (1-2,4) */ 1191287546eaSitojun do_update = 0; 1192287546eaSitojun } else { 1193287546eaSitojun do_update = 1; 1194287546eaSitojun if (!lladdr) /* (6) */ 1195287546eaSitojun newstate = ND6_LLINFO_NOSTATE; 1196287546eaSitojun else /* (7) */ 1197287546eaSitojun newstate = ND6_LLINFO_STALE; 1198287546eaSitojun } 1199287546eaSitojun 1200287546eaSitojun if (do_update) { 1201287546eaSitojun /* 1202287546eaSitojun * Update the state of the neighbor cache. 1203287546eaSitojun */ 1204287546eaSitojun ln->ln_state = newstate; 1205287546eaSitojun 1206287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 12078a7bb304Sitojun /* 120853b39a0bSmpi * Since nd6_resolve() in ifp->if_output() will cause 12098b542bbeSpascoe * state transition to DELAY and reset the timer, 12108a7bb304Sitojun * we must set the timer now, although it is actually 12118a7bb304Sitojun * meaningless. 12128a7bb304Sitojun */ 1213134b71fcSdlg nd6_llinfo_settimer(ln, nd6_gctimer); 12148a7bb304Sitojun 1215287546eaSitojun if (ln->ln_hold) { 1216e212adedSkrw struct mbuf *n = ln->ln_hold; 1217e212adedSkrw ln->ln_hold = NULL; 12186afad192Sitojun /* 12196afad192Sitojun * we assume ifp is not a p2p here, so just 12206afad192Sitojun * set the 2nd argument as the 1st one. 12216afad192Sitojun */ 122253b39a0bSmpi ifp->if_output(ifp, n, rt_key(rt), rt); 1223e212adedSkrw if (ln->ln_hold == n) { 1224e212adedSkrw /* n is back in ln_hold. Discard. */ 1225e212adedSkrw m_freem(ln->ln_hold); 12268a7bb304Sitojun ln->ln_hold = NULL; 1227287546eaSitojun } 1228e212adedSkrw } 1229287546eaSitojun } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 1230287546eaSitojun /* probe right away */ 1231334bfa0aSmpi nd6_llinfo_settimer(ln, 0); 1232287546eaSitojun } 1233287546eaSitojun } 1234287546eaSitojun 1235287546eaSitojun /* 1236287546eaSitojun * ICMP6 type dependent behavior. 1237287546eaSitojun * 1238287546eaSitojun * NS: clear IsRouter if new entry 1239287546eaSitojun * RS: clear IsRouter 1240287546eaSitojun * RA: set IsRouter if there's lladdr 1241287546eaSitojun * redir: clear IsRouter if new entry 1242287546eaSitojun * 1243287546eaSitojun * RA case, (1): 1244287546eaSitojun * The spec says that we must set IsRouter in the following cases: 1245287546eaSitojun * - If lladdr exist, set IsRouter. This means (1-5). 1246287546eaSitojun * - If it is old entry (!newentry), set IsRouter. This means (7). 1247287546eaSitojun * So, based on the spec, in (1-5) and (7) cases we must set IsRouter. 12488b542bbeSpascoe * A question arises for (1) case. (1) case has no lladdr in the 1249287546eaSitojun * neighbor cache, this is similar to (6). 1250287546eaSitojun * This case is rare but we figured that we MUST NOT set IsRouter. 1251287546eaSitojun * 1252287546eaSitojun * newentry olladdr lladdr llchange NS RS RA redir 1253287546eaSitojun * D R 1254287546eaSitojun * 0 n n -- (1) c ? s 1255287546eaSitojun * 0 y n -- (2) c s s 1256287546eaSitojun * 0 n y -- (3) c s s 1257287546eaSitojun * 0 y y n (4) c s s 1258287546eaSitojun * 0 y y y (5) c s s 1259287546eaSitojun * 1 -- n -- (6) c c c s 1260287546eaSitojun * 1 -- y -- (7) c c s c s 1261287546eaSitojun * 1262287546eaSitojun * (c=clear s=set) 1263287546eaSitojun */ 1264287546eaSitojun switch (type & 0xff) { 1265287546eaSitojun case ND_NEIGHBOR_SOLICIT: 1266287546eaSitojun /* 1267287546eaSitojun * New entry must have is_router flag cleared. 1268287546eaSitojun */ 1269287546eaSitojun if (is_newentry) /* (6-7) */ 1270287546eaSitojun ln->ln_router = 0; 1271287546eaSitojun break; 1272287546eaSitojun case ND_REDIRECT: 1273287546eaSitojun /* 1274287546eaSitojun * If the icmp is a redirect to a better router, always set the 1275287546eaSitojun * is_router flag. Otherwise, if the entry is newly created, 1276287546eaSitojun * clear the flag. [RFC 2461, sec 8.3] 1277287546eaSitojun */ 1278287546eaSitojun if (code == ND_REDIRECT_ROUTER) 1279287546eaSitojun ln->ln_router = 1; 1280287546eaSitojun else if (is_newentry) /* (6-7) */ 1281287546eaSitojun ln->ln_router = 0; 1282287546eaSitojun break; 1283287546eaSitojun case ND_ROUTER_SOLICIT: 1284287546eaSitojun /* 1285287546eaSitojun * is_router flag must always be cleared. 1286287546eaSitojun */ 1287287546eaSitojun ln->ln_router = 0; 1288287546eaSitojun break; 1289287546eaSitojun case ND_ROUTER_ADVERT: 1290287546eaSitojun /* 1291287546eaSitojun * Mark an entry with lladdr as a router. 1292287546eaSitojun */ 1293d8a7e3a7Sitojun if ((!is_newentry && (olladdr || lladdr)) || /* (2-5) */ 1294d8a7e3a7Sitojun (is_newentry && lladdr)) { /* (7) */ 1295287546eaSitojun ln->ln_router = 1; 1296287546eaSitojun } 1297287546eaSitojun break; 1298287546eaSitojun } 1299287546eaSitojun 130016119bbfSmpi rtfree(rt); 1301287546eaSitojun } 1302287546eaSitojun 1303a0aa363cSjsing void 1304ee37ea65Smcbride nd6_slowtimo(void *ignored_arg) 1305287546eaSitojun { 1306b3c1e4c1Sitojun struct nd_ifinfo *nd6if; 1307d6b9e9b9Sitojun struct ifnet *ifp; 130822e88dadSmpi 1309aa28b9a6Smpi NET_LOCK(); 1310287546eaSitojun 131129e86e5eSblambert timeout_add_sec(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL); 131222e88dadSmpi 1313d814b14cSbluhm TAILQ_FOREACH(ifp, &ifnet, if_list) { 1314d6b9e9b9Sitojun nd6if = ND_IFINFO(ifp); 1315287546eaSitojun if (nd6if->basereachable && /* already initialized */ 1316287546eaSitojun (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) { 1317287546eaSitojun /* 1318287546eaSitojun * Since reachable time rarely changes by router 1319287546eaSitojun * advertisements, we SHOULD insure that a new random 1320287546eaSitojun * value gets recomputed at least once every few hours. 1321287546eaSitojun * (RFC 2461, 6.3.4) 1322287546eaSitojun */ 1323287546eaSitojun nd6if->recalctm = nd6_recalc_reachtm_interval; 1324287546eaSitojun nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable); 1325287546eaSitojun } 1326287546eaSitojun } 1327aa28b9a6Smpi NET_UNLOCK(); 1328287546eaSitojun } 1329287546eaSitojun 1330287546eaSitojun int 13315d32b3a0Smpi nd6_resolve(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m, 13325d32b3a0Smpi struct sockaddr *dst, u_char *desten) 13335d32b3a0Smpi { 13345d32b3a0Smpi struct sockaddr_dl *sdl; 13355d32b3a0Smpi struct rtentry *rt; 1336287546eaSitojun struct llinfo_nd6 *ln = NULL; 1337287546eaSitojun 13385d32b3a0Smpi if (m->m_flags & M_MCAST) { 13395d32b3a0Smpi ETHER_MAP_IPV6_MULTICAST(&satosin6(dst)->sin6_addr, desten); 13405d32b3a0Smpi return (0); 13415d32b3a0Smpi } 13425b3a2895Ssthen 1343c370e97fSmpi rt = rt_getll(rt0); 1344c370e97fSmpi 1345c370e97fSmpi if (ISSET(rt->rt_flags, RTF_REJECT) && 13463209772dScheloha (rt->rt_expire == 0 || getuptime() < rt->rt_expire)) { 13478c023157Smpi m_freem(m); 1348c370e97fSmpi return (rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 1349287546eaSitojun } 1350cfb6b8dfSitojun 1351287546eaSitojun /* 1352287546eaSitojun * Address resolution or Neighbor Unreachability Detection 1353287546eaSitojun * for the next hop. 1354287546eaSitojun * At this point, the destination of the packet must be a unicast 1355287546eaSitojun * or an anycast address(i.e. not a multicast). 1356287546eaSitojun */ 13575da3fb44Smpi if (!ISSET(rt->rt_flags, RTF_LLINFO)) { 1358bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 13595da3fb44Smpi log(LOG_DEBUG, "%s: %s: route contains no ND information\n", 13605da3fb44Smpi __func__, inet_ntop(AF_INET6, 13615da3fb44Smpi &satosin6(rt_key(rt))->sin6_addr, addr, sizeof(addr))); 136216119bbfSmpi m_freem(m); 13635da3fb44Smpi return (EINVAL); 1364287546eaSitojun } 1365287546eaSitojun 13665d32b3a0Smpi if (rt->rt_gateway->sa_family != AF_LINK) { 13675d32b3a0Smpi printf("%s: something odd happens\n", __func__); 13685d32b3a0Smpi m_freem(m); 13695d32b3a0Smpi return (EINVAL); 13705d32b3a0Smpi } 13715d32b3a0Smpi 13725da3fb44Smpi ln = (struct llinfo_nd6 *)rt->rt_llinfo; 13735da3fb44Smpi KASSERT(ln != NULL); 1374cfb6b8dfSitojun 1375f3fcf2f3Smcbride /* 1376f3fcf2f3Smcbride * Move this entry to the head of the queue so that it is less likely 1377f3fcf2f3Smcbride * for this entry to be a target of forced garbage collection (see 1378f3fcf2f3Smcbride * nd6_rtrequest()). 1379f3fcf2f3Smcbride */ 138092c821ddSbluhm TAILQ_REMOVE(&nd6_list, ln, ln_list); 138192c821ddSbluhm TAILQ_INSERT_HEAD(&nd6_list, ln, ln_list); 1382f3fcf2f3Smcbride 1383287546eaSitojun /* 1384287546eaSitojun * The first time we send a packet to a neighbor whose entry is 1385287546eaSitojun * STALE, we have to change the state to DELAY and a sets a timer to 1386287546eaSitojun * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do 1387287546eaSitojun * neighbor unreachability detection on expiration. 1388287546eaSitojun * (RFC 2461 7.3.3) 1389287546eaSitojun */ 1390287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 1391287546eaSitojun ln->ln_asked = 0; 1392287546eaSitojun ln->ln_state = ND6_LLINFO_DELAY; 1393134b71fcSdlg nd6_llinfo_settimer(ln, nd6_delay); 1394287546eaSitojun } 1395287546eaSitojun 1396287546eaSitojun /* 1397287546eaSitojun * If the neighbor cache entry has a state other than INCOMPLETE 139834deef1eSitojun * (i.e. its link-layer address is already resolved), just 1399287546eaSitojun * send the packet. 1400287546eaSitojun */ 14015d32b3a0Smpi if (ln->ln_state > ND6_LLINFO_INCOMPLETE) { 14025d32b3a0Smpi sdl = satosdl(rt->rt_gateway); 14035d32b3a0Smpi if (sdl->sdl_alen != ETHER_ADDR_LEN) { 14045d32b3a0Smpi char addr[INET6_ADDRSTRLEN]; 14055d32b3a0Smpi log(LOG_DEBUG, "%s: %s: incorrect nd6 information\n", 14065d32b3a0Smpi __func__, 14075d32b3a0Smpi inet_ntop(AF_INET6, &satosin6(dst)->sin6_addr, 14085d32b3a0Smpi addr, sizeof(addr))); 14095d32b3a0Smpi m_freem(m); 14105d32b3a0Smpi return (EINVAL); 14115d32b3a0Smpi } 14125d32b3a0Smpi 14135d32b3a0Smpi bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 14145d32b3a0Smpi return (0); 14155d32b3a0Smpi } 1416287546eaSitojun 1417287546eaSitojun /* 1418287546eaSitojun * There is a neighbor cache entry, but no ethernet address 1419287546eaSitojun * response yet. Replace the held mbuf (if any) with this 1420287546eaSitojun * latest one. 1421287546eaSitojun */ 1422efcf292bSitojun if (ln->ln_state == ND6_LLINFO_NOSTATE) 1423287546eaSitojun ln->ln_state = ND6_LLINFO_INCOMPLETE; 1424287546eaSitojun m_freem(ln->ln_hold); 1425287546eaSitojun ln->ln_hold = m; 14265d32b3a0Smpi 142776843262Sitojun /* 142876843262Sitojun * If there has been no NS for the neighbor after entering the 142976843262Sitojun * INCOMPLETE state, send the first solicitation. 143076843262Sitojun */ 14319631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln) && ln->ln_asked == 0) { 1432287546eaSitojun ln->ln_asked++; 1433134b71fcSdlg nd6_llinfo_settimer(ln, ND_IFINFO(ifp)->retrans / 1000); 14345d32b3a0Smpi nd6_ns_output(ifp, NULL, &satosin6(dst)->sin6_addr, ln, 0); 1435287546eaSitojun } 14365d32b3a0Smpi return (EAGAIN); 1437287546eaSitojun } 1438287546eaSitojun 1439287546eaSitojun int 1440ee37ea65Smcbride nd6_need_cache(struct ifnet *ifp) 1441d8a7e3a7Sitojun { 1442d8a7e3a7Sitojun /* 1443d8a7e3a7Sitojun * RFC2893 says: 1444d8a7e3a7Sitojun * - unidirectional tunnels needs no ND 1445d8a7e3a7Sitojun */ 1446d8a7e3a7Sitojun switch (ifp->if_type) { 1447d8a7e3a7Sitojun case IFT_ETHER: 1448d8a7e3a7Sitojun case IFT_IEEE80211: 1449f4433d56Shenning case IFT_CARP: 1450d8a7e3a7Sitojun return (1); 1451d8a7e3a7Sitojun default: 1452d8a7e3a7Sitojun return (0); 1453d8a7e3a7Sitojun } 1454d8a7e3a7Sitojun } 1455