1*4d7e99f8Skn /* $OpenBSD: nd6.c,v 1.252 2022/11/23 16:57:37 kn 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> 43287546eaSitojun #include <sys/errno.h> 44287546eaSitojun #include <sys/ioctl.h> 45287546eaSitojun #include <sys/syslog.h> 46287546eaSitojun #include <sys/queue.h> 47c6bbd2a8Sflorian #include <sys/stdint.h> 48a09574ebSkettenis #include <sys/task.h> 49287546eaSitojun 50287546eaSitojun #include <net/if.h> 51287546eaSitojun #include <net/if_dl.h> 52287546eaSitojun #include <net/if_types.h> 53287546eaSitojun #include <net/route.h> 54287546eaSitojun 55287546eaSitojun #include <netinet/in.h> 56287546eaSitojun #include <netinet/if_ether.h> 57cb39d30aSangelos #include <netinet/ip_ipsp.h> 5858aa7d74Sangelos 59287546eaSitojun #include <netinet6/in6_var.h> 60fa86ee14Sitojun #include <netinet/ip6.h> 61287546eaSitojun #include <netinet6/ip6_var.h> 62287546eaSitojun #include <netinet6/nd6.h> 63fa86ee14Sitojun #include <netinet/icmp6.h> 64287546eaSitojun 65287546eaSitojun #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */ 66287546eaSitojun #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */ 67287546eaSitojun 68287546eaSitojun /* timer values */ 693209772dScheloha int nd6_timer_next = -1; /* at which uptime nd6_timer runs */ 703209772dScheloha time_t nd6_expire_next = -1; /* at which uptime nd6_expire runs */ 71287546eaSitojun int nd6_delay = 5; /* delay first probe time 5 second */ 72287546eaSitojun int nd6_umaxtries = 3; /* maximum unicast query */ 73287546eaSitojun int nd6_mmaxtries = 3; /* maximum multicast query */ 74be4e9e12Sitojun int nd6_gctimer = (60 * 60 * 24); /* 1 day: garbage collection timer */ 75287546eaSitojun 76287546eaSitojun /* preventing too many loops in ND option parsing */ 77287546eaSitojun int nd6_maxndopt = 10; /* max # of ND options allowed */ 78287546eaSitojun 79f6e55599Sitojun int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */ 80f6e55599Sitojun 81b79da24aSitojun #ifdef ND6_DEBUG 82b79da24aSitojun int nd6_debug = 1; 83b79da24aSitojun #else 84b79da24aSitojun int nd6_debug = 0; 85b79da24aSitojun #endif 86b79da24aSitojun 8792c821ddSbluhm TAILQ_HEAD(llinfo_nd6_head, llinfo_nd6) nd6_list; 8893fbd125Sbluhm struct pool nd6_pool; /* pool for llinfo_nd6 structures */ 89ea006b74Skn int nd6_inuse; 90287546eaSitojun 91334bfa0aSmpi void nd6_timer(void *); 92a0aa363cSjsing void nd6_slowtimo(void *); 93088d4855Smpi void nd6_expire(void *); 94088d4855Smpi void nd6_expire_timer(void *); 95c370e97fSmpi void nd6_invalidate(struct rtentry *); 9618e33022Sbluhm void nd6_free(struct rtentry *); 97334bfa0aSmpi int nd6_llinfo_timer(struct rtentry *); 98287546eaSitojun 99334bfa0aSmpi struct timeout nd6_timer_to; 100b3c1e4c1Sitojun struct timeout nd6_slowtimo_ch; 101088d4855Smpi struct timeout nd6_expire_timeout; 102088d4855Smpi struct task nd6_expire_task; 103b3c1e4c1Sitojun 104287546eaSitojun void 105a0aa363cSjsing nd6_init(void) 106287546eaSitojun { 107287546eaSitojun static int nd6_init_done = 0; 108287546eaSitojun 109287546eaSitojun if (nd6_init_done) { 11035075f95Smpi log(LOG_NOTICE, "%s called more than once\n", __func__); 111287546eaSitojun return; 112287546eaSitojun } 113287546eaSitojun 11492c821ddSbluhm TAILQ_INIT(&nd6_list); 1151378bae2Sdlg pool_init(&nd6_pool, sizeof(struct llinfo_nd6), 0, 1161378bae2Sdlg IPL_SOFTNET, 0, "nd6", NULL); 11793fbd125Sbluhm 118088d4855Smpi task_set(&nd6_expire_task, nd6_expire, NULL); 119a09574ebSkettenis 120287546eaSitojun nd6_init_done = 1; 121287546eaSitojun 122287546eaSitojun /* start timer */ 123713fe098Skn timeout_set_proc(&nd6_timer_to, nd6_timer, NULL); 12422e88dadSmpi timeout_set_proc(&nd6_slowtimo_ch, nd6_slowtimo, NULL); 12529e86e5eSblambert timeout_add_sec(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL); 126088d4855Smpi timeout_set(&nd6_expire_timeout, nd6_expire_timer, NULL); 127287546eaSitojun } 128287546eaSitojun 129*4d7e99f8Skn void 130ee37ea65Smcbride nd6_ifattach(struct ifnet *ifp) 131287546eaSitojun { 132d6b9e9b9Sitojun struct nd_ifinfo *nd; 133287546eaSitojun 134393af863Skrw nd = malloc(sizeof(*nd), M_IP6NDP, M_WAITOK | M_ZERO); 135287546eaSitojun 136d6b9e9b9Sitojun nd->initialized = 1; 137287546eaSitojun 138d6b9e9b9Sitojun nd->basereachable = REACHABLE_TIME; 139d6b9e9b9Sitojun nd->reachable = ND_COMPUTE_RTIME(nd->basereachable); 140d6b9e9b9Sitojun nd->retrans = RETRANS_TIMER; 1411b5f410aSitojun 142*4d7e99f8Skn ifp->if_nd = nd; 143287546eaSitojun } 144287546eaSitojun 145d6b9e9b9Sitojun void 146*4d7e99f8Skn nd6_ifdetach(struct ifnet *ifp) 147d6b9e9b9Sitojun { 148*4d7e99f8Skn struct nd_ifinfo *nd = ifp->if_nd; 149d374aaacSitojun 15062cf959dSmpi free(nd, M_IP6NDP, sizeof(*nd)); 151287546eaSitojun } 152287546eaSitojun 153287546eaSitojun void 154ee37ea65Smcbride nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts) 155287546eaSitojun { 156287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 157287546eaSitojun ndopts->nd_opts_search = (struct nd_opt_hdr *)opt; 158287546eaSitojun ndopts->nd_opts_last 159287546eaSitojun = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len); 160287546eaSitojun 161287546eaSitojun if (icmp6len == 0) { 162287546eaSitojun ndopts->nd_opts_done = 1; 163287546eaSitojun ndopts->nd_opts_search = NULL; 164287546eaSitojun } 165287546eaSitojun } 166287546eaSitojun 167287546eaSitojun /* 168287546eaSitojun * Take one ND option. 169287546eaSitojun */ 170287546eaSitojun struct nd_opt_hdr * 171ee37ea65Smcbride nd6_option(union nd_opts *ndopts) 172287546eaSitojun { 173287546eaSitojun struct nd_opt_hdr *nd_opt; 174287546eaSitojun int olen; 175287546eaSitojun 176287546eaSitojun if (!ndopts) 177ab0ea4a9Snayden panic("%s: ndopts == NULL", __func__); 178287546eaSitojun if (!ndopts->nd_opts_last) 17940e42c82Snayden panic("%s: uninitialized ndopts", __func__); 180287546eaSitojun if (!ndopts->nd_opts_search) 181287546eaSitojun return NULL; 182287546eaSitojun if (ndopts->nd_opts_done) 183287546eaSitojun return NULL; 184287546eaSitojun 185287546eaSitojun nd_opt = ndopts->nd_opts_search; 186287546eaSitojun 18715bd77d2Sitojun /* make sure nd_opt_len is inside the buffer */ 18815bd77d2Sitojun if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) { 18915bd77d2Sitojun bzero(ndopts, sizeof(*ndopts)); 19015bd77d2Sitojun return NULL; 19115bd77d2Sitojun } 19215bd77d2Sitojun 193287546eaSitojun olen = nd_opt->nd_opt_len << 3; 194287546eaSitojun if (olen == 0) { 195287546eaSitojun /* 196287546eaSitojun * Message validation requires that all included 197287546eaSitojun * options have a length that is greater than zero. 198287546eaSitojun */ 199287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 200287546eaSitojun return NULL; 201287546eaSitojun } 202287546eaSitojun 203287546eaSitojun ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen); 20415bd77d2Sitojun if (ndopts->nd_opts_search > ndopts->nd_opts_last) { 20515bd77d2Sitojun /* option overruns the end of buffer, invalid */ 20615bd77d2Sitojun bzero(ndopts, sizeof(*ndopts)); 20715bd77d2Sitojun return NULL; 20815bd77d2Sitojun } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) { 20915bd77d2Sitojun /* reached the end of options chain */ 210287546eaSitojun ndopts->nd_opts_done = 1; 211287546eaSitojun ndopts->nd_opts_search = NULL; 212287546eaSitojun } 213287546eaSitojun return nd_opt; 214287546eaSitojun } 215287546eaSitojun 216287546eaSitojun /* 217287546eaSitojun * Parse multiple ND options. 218287546eaSitojun * This function is much easier to use, for ND routines that do not need 219287546eaSitojun * multiple options of the same type. 220287546eaSitojun */ 221287546eaSitojun int 222ee37ea65Smcbride nd6_options(union nd_opts *ndopts) 223287546eaSitojun { 224287546eaSitojun struct nd_opt_hdr *nd_opt; 225287546eaSitojun int i = 0; 226287546eaSitojun 227287546eaSitojun if (!ndopts) 228ab0ea4a9Snayden panic("%s: ndopts == NULL", __func__); 229287546eaSitojun if (!ndopts->nd_opts_last) 23040e42c82Snayden panic("%s: uninitialized ndopts", __func__); 231287546eaSitojun if (!ndopts->nd_opts_search) 232287546eaSitojun return 0; 233287546eaSitojun 234287546eaSitojun while (1) { 235287546eaSitojun nd_opt = nd6_option(ndopts); 236287546eaSitojun if (!nd_opt && !ndopts->nd_opts_last) { 237287546eaSitojun /* 238287546eaSitojun * Message validation requires that all included 239287546eaSitojun * options have a length that is greater than zero. 240287546eaSitojun */ 24107ba5f7cSjca icmp6stat_inc(icp6s_nd_badopt); 242287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 243287546eaSitojun return -1; 244287546eaSitojun } 245287546eaSitojun 246287546eaSitojun if (!nd_opt) 247287546eaSitojun goto skip1; 248287546eaSitojun 249287546eaSitojun switch (nd_opt->nd_opt_type) { 250287546eaSitojun case ND_OPT_SOURCE_LINKADDR: 251287546eaSitojun case ND_OPT_TARGET_LINKADDR: 252287546eaSitojun case ND_OPT_MTU: 253287546eaSitojun case ND_OPT_REDIRECTED_HEADER: 254287546eaSitojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { 25515bd77d2Sitojun nd6log((LOG_INFO, 25615bd77d2Sitojun "duplicated ND6 option found (type=%d)\n", 25715bd77d2Sitojun nd_opt->nd_opt_type)); 258287546eaSitojun /* XXX bark? */ 259287546eaSitojun } else { 260287546eaSitojun ndopts->nd_opt_array[nd_opt->nd_opt_type] 261287546eaSitojun = nd_opt; 262287546eaSitojun } 263287546eaSitojun break; 264287546eaSitojun case ND_OPT_PREFIX_INFORMATION: 265287546eaSitojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) { 266287546eaSitojun ndopts->nd_opt_array[nd_opt->nd_opt_type] 267287546eaSitojun = nd_opt; 268287546eaSitojun } 269287546eaSitojun ndopts->nd_opts_pi_end = 270287546eaSitojun (struct nd_opt_prefix_info *)nd_opt; 271287546eaSitojun break; 2724043f337Ssthen case ND_OPT_DNSSL: 2734043f337Ssthen case ND_OPT_RDNSS: 2744043f337Ssthen /* Don't warn */ 2754043f337Ssthen break; 276287546eaSitojun default: 277287546eaSitojun /* 278287546eaSitojun * Unknown options must be silently ignored, 279e4d25771Stodd * to accommodate future extension to the protocol. 280287546eaSitojun */ 281b79da24aSitojun nd6log((LOG_DEBUG, 282287546eaSitojun "nd6_options: unsupported option %d - " 283b79da24aSitojun "option ignored\n", nd_opt->nd_opt_type)); 284287546eaSitojun } 285287546eaSitojun 286287546eaSitojun skip1: 287287546eaSitojun i++; 288287546eaSitojun if (i > nd6_maxndopt) { 28907ba5f7cSjca icmp6stat_inc(icp6s_nd_toomanyopt); 290b79da24aSitojun nd6log((LOG_INFO, "too many loop in nd opt\n")); 291287546eaSitojun break; 292287546eaSitojun } 293287546eaSitojun 294287546eaSitojun if (ndopts->nd_opts_done) 295287546eaSitojun break; 296287546eaSitojun } 297287546eaSitojun 298287546eaSitojun return 0; 299287546eaSitojun } 300287546eaSitojun 301287546eaSitojun /* 3029631a17bSitojun * ND6 timer routine to handle ND6 entries 303287546eaSitojun */ 304287546eaSitojun void 305b7607505Skn nd6_llinfo_settimer(const struct llinfo_nd6 *ln, unsigned int secs) 3069631a17bSitojun { 3073209772dScheloha time_t expire = getuptime() + secs; 308334bfa0aSmpi 309334bfa0aSmpi NET_ASSERT_LOCKED(); 3109a2314e5Smpi KASSERT(!ISSET(ln->ln_rt->rt_flags, RTF_LOCAL)); 311334bfa0aSmpi 312334bfa0aSmpi ln->ln_rt->rt_expire = expire; 313334bfa0aSmpi if (!timeout_pending(&nd6_timer_to) || expire < nd6_timer_next) { 314334bfa0aSmpi nd6_timer_next = expire; 315334bfa0aSmpi timeout_add_sec(&nd6_timer_to, secs); 3169631a17bSitojun } 3179631a17bSitojun } 3189631a17bSitojun 319a0aa363cSjsing void 320713fe098Skn nd6_timer(void *unused) 321287546eaSitojun { 322334bfa0aSmpi struct llinfo_nd6 *ln, *nln; 323a01b2dc3Skn time_t expire = getuptime() + nd6_gctimer; 324a01b2dc3Skn int secs; 325334bfa0aSmpi 326334bfa0aSmpi NET_LOCK(); 327334bfa0aSmpi TAILQ_FOREACH_SAFE(ln, &nd6_list, ln_list, nln) { 328334bfa0aSmpi struct rtentry *rt = ln->ln_rt; 329334bfa0aSmpi 330a01b2dc3Skn if (rt->rt_expire && rt->rt_expire <= getuptime()) 331334bfa0aSmpi if (nd6_llinfo_timer(rt)) 332334bfa0aSmpi continue; 333334bfa0aSmpi 334334bfa0aSmpi if (rt->rt_expire && rt->rt_expire < expire) 335334bfa0aSmpi expire = rt->rt_expire; 336334bfa0aSmpi } 337334bfa0aSmpi 338a01b2dc3Skn secs = expire - getuptime(); 339a01b2dc3Skn if (secs < 0) 340a01b2dc3Skn secs = 0; 341b089e30eSflorian if (!TAILQ_EMPTY(&nd6_list)) { 342a01b2dc3Skn nd6_timer_next = getuptime() + secs; 343a01b2dc3Skn timeout_add_sec(&nd6_timer_to, secs); 344b089e30eSflorian } 345334bfa0aSmpi 346334bfa0aSmpi NET_UNLOCK(); 347334bfa0aSmpi } 348334bfa0aSmpi 349334bfa0aSmpi /* 350334bfa0aSmpi * ND timer state handling. 351334bfa0aSmpi * 352334bfa0aSmpi * Returns 1 if `rt' should no longer be used, 0 otherwise. 353334bfa0aSmpi */ 354334bfa0aSmpi int 355334bfa0aSmpi nd6_llinfo_timer(struct rtentry *rt) 356334bfa0aSmpi { 357334bfa0aSmpi struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 358334bfa0aSmpi struct sockaddr_in6 *dst = satosin6(rt_key(rt)); 3599631a17bSitojun struct ifnet *ifp; 360287546eaSitojun 361334bfa0aSmpi NET_ASSERT_LOCKED(); 3629631a17bSitojun 363334bfa0aSmpi if ((ifp = if_get(rt->rt_ifidx)) == NULL) 364334bfa0aSmpi return 1; 3659631a17bSitojun 366287546eaSitojun switch (ln->ln_state) { 367287546eaSitojun case ND6_LLINFO_INCOMPLETE: 368287546eaSitojun if (ln->ln_asked < nd6_mmaxtries) { 369287546eaSitojun ln->ln_asked++; 3702c55d1bcSkn nd6_llinfo_settimer(ln, ND_IFINFO(ifp)->retrans / 1000); 3719631a17bSitojun nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 372287546eaSitojun } else { 373287546eaSitojun struct mbuf *m = ln->ln_hold; 374287546eaSitojun if (m) { 3758294a4dfSitojun ln->ln_hold = NULL; 376287546eaSitojun /* 377d8a7e3a7Sitojun * Fake rcvif to make the ICMP error 378d8a7e3a7Sitojun * more helpful in diagnosing for the 379d8a7e3a7Sitojun * receiver. 380287546eaSitojun * XXX: should we consider 381287546eaSitojun * older rcvif? 382287546eaSitojun */ 38328112c65Smpi m->m_pkthdr.ph_ifidx = rt->rt_ifidx; 384d8a7e3a7Sitojun 385287546eaSitojun icmp6_error(m, ICMP6_DST_UNREACH, 386287546eaSitojun ICMP6_DST_UNREACH_ADDR, 0); 387e212adedSkrw if (ln->ln_hold == m) { 388e212adedSkrw /* m is back in ln_hold. Discard. */ 389e212adedSkrw m_freem(ln->ln_hold); 390e212adedSkrw ln->ln_hold = NULL; 391e212adedSkrw } 392287546eaSitojun } 39318e33022Sbluhm nd6_free(rt); 3949631a17bSitojun ln = NULL; 395287546eaSitojun } 396287546eaSitojun break; 397287546eaSitojun case ND6_LLINFO_REACHABLE: 3989631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 399287546eaSitojun ln->ln_state = ND6_LLINFO_STALE; 400134b71fcSdlg nd6_llinfo_settimer(ln, nd6_gctimer); 401be4e9e12Sitojun } 402287546eaSitojun break; 403be4e9e12Sitojun 404be4e9e12Sitojun case ND6_LLINFO_STALE: 405f3fcf2f3Smcbride case ND6_LLINFO_PURGE: 406be4e9e12Sitojun /* Garbage Collection(RFC 2461 5.3) */ 4079631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 40818e33022Sbluhm nd6_free(rt); 4099631a17bSitojun ln = NULL; 4109631a17bSitojun } 411be4e9e12Sitojun break; 412be4e9e12Sitojun 413287546eaSitojun case ND6_LLINFO_DELAY: 414d374aaacSitojun /* We need NUD */ 415287546eaSitojun ln->ln_asked = 1; 416287546eaSitojun ln->ln_state = ND6_LLINFO_PROBE; 4172c55d1bcSkn nd6_llinfo_settimer(ln, ND_IFINFO(ifp)->retrans / 1000); 4182c55d1bcSkn nd6_ns_output(ifp, &dst->sin6_addr, &dst->sin6_addr, ln, 0); 419287546eaSitojun break; 420287546eaSitojun case ND6_LLINFO_PROBE: 421287546eaSitojun if (ln->ln_asked < nd6_umaxtries) { 422287546eaSitojun ln->ln_asked++; 4232c55d1bcSkn nd6_llinfo_settimer(ln, ND_IFINFO(ifp)->retrans / 1000); 424287546eaSitojun nd6_ns_output(ifp, &dst->sin6_addr, 425287546eaSitojun &dst->sin6_addr, ln, 0); 426d8a7e3a7Sitojun } else { 42718e33022Sbluhm nd6_free(rt); 4289631a17bSitojun ln = NULL; 429d8a7e3a7Sitojun } 430287546eaSitojun break; 431287546eaSitojun } 4329631a17bSitojun 433f5e0f62bSmpi if_put(ifp); 434334bfa0aSmpi 435334bfa0aSmpi return (ln == NULL); 436287546eaSitojun } 437287546eaSitojun 438c6bbd2a8Sflorian void 439c6bbd2a8Sflorian nd6_expire_timer_update(struct in6_ifaddr *ia6) 440c6bbd2a8Sflorian { 441c6bbd2a8Sflorian time_t expire_time = INT64_MAX; 442a01b2dc3Skn int secs; 443c6bbd2a8Sflorian 444c6bbd2a8Sflorian if (ia6->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) 445c6bbd2a8Sflorian expire_time = ia6->ia6_lifetime.ia6t_expire; 446c6bbd2a8Sflorian 447c6bbd2a8Sflorian if (!(ia6->ia6_flags & IN6_IFF_DEPRECATED) && 448c6bbd2a8Sflorian ia6->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME && 449c6bbd2a8Sflorian expire_time > ia6->ia6_lifetime.ia6t_preferred) 450c6bbd2a8Sflorian expire_time = ia6->ia6_lifetime.ia6t_preferred; 451c6bbd2a8Sflorian 452c6bbd2a8Sflorian if (expire_time == INT64_MAX) 453c6bbd2a8Sflorian return; 454c6bbd2a8Sflorian 455c6bbd2a8Sflorian /* 456c6bbd2a8Sflorian * IFA6_IS_INVALID() and IFA6_IS_DEPRECATED() check for uptime 457c6bbd2a8Sflorian * greater than ia6t_expire or ia6t_preferred, not greater or equal. 458c6bbd2a8Sflorian * Schedule timeout one second later so that either IFA6_IS_INVALID() 459c6bbd2a8Sflorian * or IFA6_IS_DEPRECATED() is true. 460c6bbd2a8Sflorian */ 461c6bbd2a8Sflorian expire_time++; 462c6bbd2a8Sflorian 463334bfa0aSmpi if (!timeout_pending(&nd6_expire_timeout) || 464334bfa0aSmpi nd6_expire_next > expire_time) { 4653209772dScheloha secs = expire_time - getuptime(); 466c6bbd2a8Sflorian if (secs < 0) 467c6bbd2a8Sflorian secs = 0; 468c6bbd2a8Sflorian 469c6bbd2a8Sflorian timeout_add_sec(&nd6_expire_timeout, secs); 470334bfa0aSmpi nd6_expire_next = expire_time; 471c6bbd2a8Sflorian } 472c6bbd2a8Sflorian } 473c6bbd2a8Sflorian 4749631a17bSitojun /* 475088d4855Smpi * Expire interface addresses. 4769631a17bSitojun */ 4779631a17bSitojun void 478088d4855Smpi nd6_expire(void *unused) 4799631a17bSitojun { 480a44d5cf0Smpi struct ifnet *ifp; 4819631a17bSitojun 482aa28b9a6Smpi NET_LOCK(); 48322e88dadSmpi 484ccb45f8eSkn TAILQ_FOREACH(ifp, &ifnetlist, if_list) { 485a44d5cf0Smpi struct ifaddr *ifa, *nifa; 486a44d5cf0Smpi struct in6_ifaddr *ia6; 487a44d5cf0Smpi 488a44d5cf0Smpi TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrlist, ifa_list, nifa) { 489a44d5cf0Smpi if (ifa->ifa_addr->sa_family != AF_INET6) 490a44d5cf0Smpi continue; 4913bb2119cSkn ia6 = ifatoia6(ifaref(ifa)); 492d8a7e3a7Sitojun /* check address lifetime */ 493d8a7e3a7Sitojun if (IFA6_IS_INVALID(ia6)) { 494d8a7e3a7Sitojun in6_purgeaddr(&ia6->ia_ifa); 495d8a7e3a7Sitojun } else { 496c6bbd2a8Sflorian if (IFA6_IS_DEPRECATED(ia6)) 497c6bbd2a8Sflorian ia6->ia6_flags |= IN6_IFF_DEPRECATED; 498c6bbd2a8Sflorian nd6_expire_timer_update(ia6); 499d8a7e3a7Sitojun } 500d8a7e3a7Sitojun } 501a44d5cf0Smpi } 502d8a7e3a7Sitojun 503aa28b9a6Smpi NET_UNLOCK(); 504287546eaSitojun } 505287546eaSitojun 506a09574ebSkettenis void 507088d4855Smpi nd6_expire_timer(void *unused) 508a09574ebSkettenis { 50993865884Ssashan task_add(net_tq(0), &nd6_expire_task); 510a09574ebSkettenis } 511a09574ebSkettenis 51222770369Sitojun /* 51322770369Sitojun * Nuke neighbor cache/prefix/default router management table, right before 51422770369Sitojun * ifp goes away. 51522770369Sitojun */ 51622770369Sitojun void 517ee37ea65Smcbride nd6_purge(struct ifnet *ifp) 51822770369Sitojun { 51922770369Sitojun struct llinfo_nd6 *ln, *nln; 52022770369Sitojun 52166736630Smpi NET_ASSERT_LOCKED(); 52245ffa37bSmpi 52322770369Sitojun /* 52422770369Sitojun * Nuke neighbor cache entries for the ifp. 52522770369Sitojun */ 52692c821ddSbluhm TAILQ_FOREACH_SAFE(ln, &nd6_list, ln_list, nln) { 52722770369Sitojun struct rtentry *rt; 52822770369Sitojun struct sockaddr_dl *sdl; 52922770369Sitojun 53022770369Sitojun rt = ln->ln_rt; 53192c821ddSbluhm if (rt != NULL && rt->rt_gateway != NULL && 53222770369Sitojun rt->rt_gateway->sa_family == AF_LINK) { 533c7b7b779Sbluhm sdl = satosdl(rt->rt_gateway); 53422770369Sitojun if (sdl->sdl_index == ifp->if_index) 53518e33022Sbluhm nd6_free(rt); 53622770369Sitojun } 53722770369Sitojun } 53822770369Sitojun } 53922770369Sitojun 540287546eaSitojun struct rtentry * 541b7607505Skn nd6_lookup(const struct in6_addr *addr6, int create, struct ifnet *ifp, 542f4d1af37Smikeb u_int rtableid) 543287546eaSitojun { 544287546eaSitojun struct rtentry *rt; 545287546eaSitojun struct sockaddr_in6 sin6; 5465148b194Smpi int flags; 547287546eaSitojun 548287546eaSitojun bzero(&sin6, sizeof(sin6)); 549287546eaSitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 550287546eaSitojun sin6.sin6_family = AF_INET6; 551287546eaSitojun sin6.sin6_addr = *addr6; 55212d3c25cSclaudio flags = (create) ? RT_RESOLVE : 0; 553d8a7e3a7Sitojun 5545148b194Smpi rt = rtalloc(sin6tosa(&sin6), flags, rtableid); 55516119bbfSmpi if (rt != NULL && (rt->rt_flags & RTF_LLINFO) == 0) { 556287546eaSitojun /* 557287546eaSitojun * This is the case for the default route. 558287546eaSitojun * If we want to create a neighbor cache for the address, we 559287546eaSitojun * should free the route for the destination and allocate an 560287546eaSitojun * interface route. 561287546eaSitojun */ 562287546eaSitojun if (create) { 56327ae666cSmpi rtfree(rt); 56427ae666cSmpi rt = NULL; 565287546eaSitojun } 566287546eaSitojun } 56716119bbfSmpi if (rt == NULL) { 568287546eaSitojun if (create && ifp) { 569cb24f5e5Sclaudio struct rt_addrinfo info; 57066f69fe1Smpi struct ifaddr *ifa; 5710ffd01d4Sbluhm int error; 572d374aaacSitojun 573287546eaSitojun /* 574287546eaSitojun * If no route is available and create is set, 575287546eaSitojun * we allocate a host route for the destination 576287546eaSitojun * and treat it like an interface route. 577287546eaSitojun * This hack is necessary for a neighbor which can't 578287546eaSitojun * be covered by our own prefix. 579287546eaSitojun */ 58066f69fe1Smpi ifa = ifaof_ifpforaddr(sin6tosa(&sin6), ifp); 581287546eaSitojun if (ifa == NULL) 582287546eaSitojun return (NULL); 583287546eaSitojun 584287546eaSitojun /* 585287546eaSitojun * Create a new route. RTF_LLINFO is necessary 586287546eaSitojun * to create a Neighbor Cache entry for the 587287546eaSitojun * destination in nd6_rtrequest which will be 5887ffb277fSbluhm * called in rtrequest. 589287546eaSitojun */ 590cb24f5e5Sclaudio bzero(&info, sizeof(info)); 59166f69fe1Smpi info.rti_ifa = ifa; 592c29fc46aSmpi info.rti_flags = RTF_HOST | RTF_LLINFO; 593c3c56496Sbluhm info.rti_info[RTAX_DST] = sin6tosa(&sin6); 594c7b7b779Sbluhm info.rti_info[RTAX_GATEWAY] = sdltosa(ifp->if_sadl); 5957ffb277fSbluhm error = rtrequest(RTM_ADD, &info, RTP_CONNECTED, &rt, 5960ffd01d4Sbluhm rtableid); 5970ffd01d4Sbluhm if (error) 598287546eaSitojun return (NULL); 5999c0643cdSbluhm if (rt->rt_llinfo != NULL) { 600287546eaSitojun struct llinfo_nd6 *ln = 601287546eaSitojun (struct llinfo_nd6 *)rt->rt_llinfo; 602287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 603287546eaSitojun } 604f6e55599Sitojun } else 605287546eaSitojun return (NULL); 606287546eaSitojun } 607287546eaSitojun /* 608287546eaSitojun * Validation for the entry. 609d8a7e3a7Sitojun * Note that the check for rt_llinfo is necessary because a cloned 610d8a7e3a7Sitojun * route from a parent route that has the L flag (e.g. the default 611d8a7e3a7Sitojun * route to a p2p interface) may have the flag, too, while the 612d8a7e3a7Sitojun * destination is not actually a neighbor. 613287546eaSitojun */ 614287546eaSitojun if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 || 615d8a7e3a7Sitojun rt->rt_gateway->sa_family != AF_LINK || rt->rt_llinfo == NULL || 616248f6870Smpi (ifp != NULL && rt->rt_ifidx != ifp->if_index)) { 617287546eaSitojun if (create) { 618bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 61935075f95Smpi nd6log((LOG_DEBUG, "%s: failed to lookup %s (if=%s)\n", 62035075f95Smpi __func__, 621bbcf0337Smpi inet_ntop(AF_INET6, addr6, addr, sizeof(addr)), 622da592434Sitojun ifp ? ifp->if_xname : "unspec")); 623287546eaSitojun } 62416119bbfSmpi rtfree(rt); 625d8a7e3a7Sitojun return (NULL); 626287546eaSitojun } 627287546eaSitojun return (rt); 628287546eaSitojun } 629287546eaSitojun 630287546eaSitojun /* 631287546eaSitojun * Detect if a given IPv6 address identifies a neighbor on a given link. 632287546eaSitojun * XXX: should take care of the destination of a p2p link? 633287546eaSitojun */ 634287546eaSitojun int 635b7607505Skn nd6_is_addr_neighbor(const struct sockaddr_in6 *addr, struct ifnet *ifp) 636287546eaSitojun { 637ef6620bcSmpi struct in6_ifaddr *ia6; 638ef6620bcSmpi struct ifaddr *ifa; 639d8a7e3a7Sitojun struct rtentry *rt; 640287546eaSitojun 641cfb6b8dfSitojun /* 642cfb6b8dfSitojun * A link-local address is always a neighbor. 643cfb6b8dfSitojun * XXX: we should use the sin6_scope_id field rather than the embedded 644cfb6b8dfSitojun * interface index. 645d8a7e3a7Sitojun * XXX: a link does not necessarily specify a single interface. 646cfb6b8dfSitojun */ 647cfb6b8dfSitojun if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) && 648cfb6b8dfSitojun ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index) 649287546eaSitojun return (1); 650287546eaSitojun 651ef6620bcSmpi TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 652ef6620bcSmpi if (ifa->ifa_addr->sa_family != AF_INET6) 653ef6620bcSmpi continue; 654ef6620bcSmpi 655ef6620bcSmpi ia6 = ifatoia6(ifa); 656ef6620bcSmpi 657ef6620bcSmpi /* Prefix check down below. */ 658ef6620bcSmpi if (ia6->ia6_flags & IN6_IFF_AUTOCONF) 659ef6620bcSmpi continue; 660ef6620bcSmpi 661ef6620bcSmpi if (IN6_ARE_MASKED_ADDR_EQUAL(&addr->sin6_addr, 662ef6620bcSmpi &ia6->ia_addr.sin6_addr, 663ef6620bcSmpi &ia6->ia_prefixmask.sin6_addr)) 664ef6620bcSmpi return (1); 665ef6620bcSmpi } 666ef6620bcSmpi 667287546eaSitojun /* 668287546eaSitojun * Even if the address matches none of our addresses, it might be 669287546eaSitojun * in the neighbor cache. 670287546eaSitojun */ 67116119bbfSmpi rt = nd6_lookup(&addr->sin6_addr, 0, ifp, ifp->if_rdomain); 67216119bbfSmpi if (rt != NULL) { 67316119bbfSmpi rtfree(rt); 674287546eaSitojun return (1); 67516119bbfSmpi } 676287546eaSitojun 677287546eaSitojun return (0); 678287546eaSitojun } 679287546eaSitojun 680c370e97fSmpi void 681c370e97fSmpi nd6_invalidate(struct rtentry *rt) 682c370e97fSmpi { 683c370e97fSmpi struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 6846143f866Sflorian struct sockaddr_dl *sdl = satosdl(rt->rt_gateway); 685c370e97fSmpi 686c370e97fSmpi m_freem(ln->ln_hold); 6876143f866Sflorian sdl->sdl_alen = 0; 688c370e97fSmpi ln->ln_hold = NULL; 689c370e97fSmpi ln->ln_state = ND6_LLINFO_INCOMPLETE; 690c370e97fSmpi ln->ln_asked = 0; 691c370e97fSmpi } 692c370e97fSmpi 693287546eaSitojun /* 694287546eaSitojun * Free an nd6 llinfo entry. 695287546eaSitojun */ 69618e33022Sbluhm void 69718e33022Sbluhm nd6_free(struct rtentry *rt) 698287546eaSitojun { 69918e33022Sbluhm struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 700c3c56496Sbluhm struct in6_addr in6 = satosin6(rt_key(rt))->sin6_addr; 701248f6870Smpi struct ifnet *ifp; 70245ffa37bSmpi 70366736630Smpi NET_ASSERT_LOCKED(); 704287546eaSitojun 705248f6870Smpi ifp = if_get(rt->rt_ifidx); 706f4f4d166Sitojun 70781d38878Smpi if (!ip6_forwarding) { 7084a2f474dSflorian if (ln->ln_router) { 709f4f4d166Sitojun /* 710f4f4d166Sitojun * rt6_flush must be called whether or not the neighbor 711f4f4d166Sitojun * is in the Default Router List. 712f4f4d166Sitojun * See a corresponding comment in nd6_na_input(). 713f4f4d166Sitojun */ 714248f6870Smpi rt6_flush(&in6, ifp); 715f4f4d166Sitojun } 716287546eaSitojun } 717287546eaSitojun 7186348db95Sbluhm KASSERT(!ISSET(rt->rt_flags, RTF_LOCAL)); 7194dfec2cfSmpi nd6_invalidate(rt); 7204dfec2cfSmpi 72129760ae1Sitojun /* 72229760ae1Sitojun * Detach the route from the routing tree and the list of neighbor 72329760ae1Sitojun * caches, and disable the route entry not to be used in already 72429760ae1Sitojun * cached routes. 72529760ae1Sitojun */ 726c370e97fSmpi if (!ISSET(rt->rt_flags, RTF_STATIC|RTF_CACHED)) 727c4cbcae8Sbluhm rtdeletemsg(rt, ifp, ifp->if_rdomain); 72829760ae1Sitojun 729248f6870Smpi if_put(ifp); 730287546eaSitojun } 731287546eaSitojun 732287546eaSitojun /* 733287546eaSitojun * Upper-layer reachability hint for Neighbor Unreachability Detection. 734287546eaSitojun * 7358b542bbeSpascoe * XXX cost-effective methods? 736287546eaSitojun */ 737287546eaSitojun void 738a7fa3e84Smpi nd6_nud_hint(struct rtentry *rt) 739287546eaSitojun { 740287546eaSitojun struct llinfo_nd6 *ln; 741a7fa3e84Smpi struct ifnet *ifp; 742287546eaSitojun 743a7fa3e84Smpi ifp = if_get(rt->rt_ifidx); 744a7fa3e84Smpi if (ifp == NULL) 745287546eaSitojun return; 746287546eaSitojun 747f6e55599Sitojun if ((rt->rt_flags & RTF_GATEWAY) != 0 || 748f6e55599Sitojun (rt->rt_flags & RTF_LLINFO) == 0 || 7499c0643cdSbluhm rt->rt_llinfo == NULL || rt->rt_gateway == NULL || 750f6e55599Sitojun rt->rt_gateway->sa_family != AF_LINK) { 751287546eaSitojun /* This is not a host route. */ 752a7fa3e84Smpi goto out; 753287546eaSitojun } 754287546eaSitojun 755287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 756804d8827Sitojun if (ln->ln_state < ND6_LLINFO_REACHABLE) 757a7fa3e84Smpi goto out; 758287546eaSitojun 759f6e55599Sitojun /* 760f6e55599Sitojun * if we get upper-layer reachability confirmation many times, 761f6e55599Sitojun * it is possible we have false information. 762f6e55599Sitojun */ 763f6e55599Sitojun ln->ln_byhint++; 764f6e55599Sitojun if (ln->ln_byhint > nd6_maxnudhint) 765a7fa3e84Smpi goto out; 766f6e55599Sitojun 767287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 768a7fa3e84Smpi if (!ND6_LLINFO_PERMANENT(ln)) 769134b71fcSdlg nd6_llinfo_settimer(ln, ND_IFINFO(ifp)->reachable); 770a7fa3e84Smpi out: 771a7fa3e84Smpi if_put(ifp); 772287546eaSitojun } 773287546eaSitojun 774287546eaSitojun void 775dcb17c31Smpi nd6_rtrequest(struct ifnet *ifp, int req, struct rtentry *rt) 776287546eaSitojun { 777287546eaSitojun struct sockaddr *gate = rt->rt_gateway; 778287546eaSitojun struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 779287546eaSitojun struct ifaddr *ifa; 7807e3957d1Sbluhm struct in6_ifaddr *ifa6; 781287546eaSitojun 7824cb08838Sclaudio if (ISSET(rt->rt_flags, RTF_GATEWAY|RTF_MULTICAST|RTF_MPLS)) 783287546eaSitojun return; 784287546eaSitojun 785d8a7e3a7Sitojun if (nd6_need_cache(ifp) == 0 && (rt->rt_flags & RTF_HOST) == 0) { 786d8a7e3a7Sitojun /* 787d8a7e3a7Sitojun * This is probably an interface direct route for a link 788d8a7e3a7Sitojun * which does not need neighbor caches (e.g. fe80::%lo0/64). 789d8a7e3a7Sitojun * We do not need special treatment below for such a route. 790d8a7e3a7Sitojun * Moreover, the RTF_LLINFO flag which would be set below 791d8a7e3a7Sitojun * would annoy the ndp(8) command. 792d8a7e3a7Sitojun */ 793d8a7e3a7Sitojun return; 794d8a7e3a7Sitojun } 795d8a7e3a7Sitojun 796af1344beSbluhm if (req == RTM_RESOLVE && nd6_need_cache(ifp) == 0) { 797d8a7e3a7Sitojun /* 798af1344beSbluhm * For routing daemons like ospf6d we allow neighbor discovery 7993bb2119cSkn * based on the cloning route only. This allows us to send 800af1344beSbluhm * packets directly into a network without having an address 801af1344beSbluhm * with matching prefix on the interface. If the cloning 8023bb2119cSkn * route is used for an 6to4 interface, we would mistakenly 803af1344beSbluhm * make a neighbor cache for the host route, and would see 804af1344beSbluhm * strange neighbor solicitation for the corresponding 805af1344beSbluhm * destination. In order to avoid confusion, we check if the 806af1344beSbluhm * interface is suitable for neighbor discovery, and stop the 807d8a7e3a7Sitojun * process if not. Additionally, we remove the LLINFO flag 808d8a7e3a7Sitojun * so that ndp(8) will not try to get the neighbor information 809d8a7e3a7Sitojun * of the destination. 810d8a7e3a7Sitojun */ 811d8a7e3a7Sitojun rt->rt_flags &= ~RTF_LLINFO; 812d8a7e3a7Sitojun return; 813d8a7e3a7Sitojun } 814d8a7e3a7Sitojun 815287546eaSitojun switch (req) { 816287546eaSitojun case RTM_ADD: 81748ebf8e1Sitojun if ((rt->rt_flags & RTF_CLONING) || 8189c0643cdSbluhm ((rt->rt_flags & (RTF_LLINFO | RTF_LOCAL)) && ln == NULL)) { 8199c0643cdSbluhm if (ln != NULL) 8209631a17bSitojun nd6_llinfo_settimer(ln, 0); 821d8a7e3a7Sitojun if ((rt->rt_flags & RTF_CLONING) != 0) 822287546eaSitojun break; 823287546eaSitojun } 824f4f4d166Sitojun /* 8258b542bbeSpascoe * In IPv4 code, we try to announce new RTF_ANNOUNCE entry here. 826f4f4d166Sitojun * We don't do that here since llinfo is not ready yet. 827f4f4d166Sitojun * 828f4f4d166Sitojun * There are also couple of other things to be discussed: 829f4f4d166Sitojun * - unsolicited NA code needs improvement beforehand 830f4f4d166Sitojun * - RFC2461 says we MAY send multicast unsolicited NA 831f4f4d166Sitojun * (7.2.6 paragraph 4), however, it also says that we 832f4f4d166Sitojun * SHOULD provide a mechanism to prevent multicast NA storm. 833f4f4d166Sitojun * we don't have anything like it right now. 834841d7adbSitojun * note that the mechanism needs a mutual agreement 835f4f4d166Sitojun * between proxies, which means that we need to implement 836841d7adbSitojun * a new protocol, or a new kludge. 837841d7adbSitojun * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA. 838f4f4d166Sitojun * we need to check ip6forwarding before sending it. 839f4f4d166Sitojun * (or should we allow proxy ND configuration only for 840f4f4d166Sitojun * routers? there's no mention about proxy ND from hosts) 841f4f4d166Sitojun */ 842f4f4d166Sitojun #if 0 843f4f4d166Sitojun /* XXX it does not work */ 844287546eaSitojun if (rt->rt_flags & RTF_ANNOUNCE) 845287546eaSitojun nd6_na_output(ifp, 846c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr, 847c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr, 848287546eaSitojun ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, 849f4f4d166Sitojun 1, NULL); 850f4f4d166Sitojun #endif 851287546eaSitojun /* FALLTHROUGH */ 852287546eaSitojun case RTM_RESOLVE: 853287546eaSitojun if (gate->sa_family != AF_LINK || 854cfc71c8bSclaudio gate->sa_len < sizeof(struct sockaddr_dl)) { 85586b61919Smpi log(LOG_DEBUG, "%s: bad gateway value: %s\n", 85686b61919Smpi __func__, ifp->if_xname); 857287546eaSitojun break; 858287546eaSitojun } 859c7b7b779Sbluhm satosdl(gate)->sdl_type = ifp->if_type; 860c7b7b779Sbluhm satosdl(gate)->sdl_index = ifp->if_index; 861d374aaacSitojun if (ln != NULL) 862287546eaSitojun break; /* This happens on a route change */ 863287546eaSitojun /* 864287546eaSitojun * Case 2: This route may come from cloning, or a manual route 865287546eaSitojun * add with a LL address. 866287546eaSitojun */ 86793fbd125Sbluhm ln = pool_get(&nd6_pool, PR_NOWAIT | PR_ZERO); 868287546eaSitojun rt->rt_llinfo = (caddr_t)ln; 8699c0643cdSbluhm if (ln == NULL) { 87093fbd125Sbluhm log(LOG_DEBUG, "%s: pool get failed\n", __func__); 871287546eaSitojun break; 872287546eaSitojun } 873287546eaSitojun nd6_inuse++; 874287546eaSitojun ln->ln_rt = rt; 875287546eaSitojun /* this is required for "ndp" command. - shin */ 876287546eaSitojun if (req == RTM_ADD) { 877287546eaSitojun /* 878287546eaSitojun * gate should have some valid AF_LINK entry, 8793bc414e3Sdlg * and ln expire should have some lifetime 880287546eaSitojun * which is specified by ndp command. 881287546eaSitojun */ 882287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 883f6e55599Sitojun ln->ln_byhint = 0; 884287546eaSitojun } else { 885287546eaSitojun /* 886287546eaSitojun * When req == RTM_RESOLVE, rt is created and 887287546eaSitojun * initialized in rtrequest(), so rt_expire is 0. 888287546eaSitojun */ 889287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 8909631a17bSitojun nd6_llinfo_settimer(ln, 0); 891287546eaSitojun } 892287546eaSitojun rt->rt_flags |= RTF_LLINFO; 89392c821ddSbluhm TAILQ_INSERT_HEAD(&nd6_list, ln, ln_list); 894287546eaSitojun 895287546eaSitojun /* 896f3fcf2f3Smcbride * If we have too many cache entries, initiate immediate 897f3fcf2f3Smcbride * purging for some "less recently used" entries. Note that 898f3fcf2f3Smcbride * we cannot directly call nd6_free() here because it would 8993bb2119cSkn * cause re-entering rtable related routines triggering 9003bb2119cSkn * lock-order-reversal problems. 901f3fcf2f3Smcbride */ 902f3fcf2f3Smcbride if (ip6_neighborgcthresh >= 0 && 903f3fcf2f3Smcbride nd6_inuse >= ip6_neighborgcthresh) { 904f3fcf2f3Smcbride int i; 905f3fcf2f3Smcbride 90692c821ddSbluhm for (i = 0; i < 10; i++) { 90792c821ddSbluhm struct llinfo_nd6 *ln_end; 90892c821ddSbluhm 90992c821ddSbluhm ln_end = TAILQ_LAST(&nd6_list, llinfo_nd6_head); 91092c821ddSbluhm if (ln_end == ln) 91192c821ddSbluhm break; 912f3fcf2f3Smcbride 913f3fcf2f3Smcbride /* Move this entry to the head */ 91492c821ddSbluhm TAILQ_REMOVE(&nd6_list, ln_end, ln_list); 91592c821ddSbluhm TAILQ_INSERT_HEAD(&nd6_list, ln_end, ln_list); 916f3fcf2f3Smcbride 917f3fcf2f3Smcbride if (ND6_LLINFO_PERMANENT(ln_end)) 918f3fcf2f3Smcbride continue; 919f3fcf2f3Smcbride 920f3fcf2f3Smcbride if (ln_end->ln_state > ND6_LLINFO_INCOMPLETE) 921f3fcf2f3Smcbride ln_end->ln_state = ND6_LLINFO_STALE; 922f3fcf2f3Smcbride else 923f3fcf2f3Smcbride ln_end->ln_state = ND6_LLINFO_PURGE; 924f3fcf2f3Smcbride nd6_llinfo_settimer(ln_end, 0); 925f3fcf2f3Smcbride } 926f3fcf2f3Smcbride } 927f3fcf2f3Smcbride 928f3fcf2f3Smcbride /* 929287546eaSitojun * check if rt_key(rt) is one of my address assigned 930287546eaSitojun * to the interface. 931287546eaSitojun */ 9327e3957d1Sbluhm ifa6 = in6ifa_ifpwithaddr(ifp, 9337e3957d1Sbluhm &satosin6(rt_key(rt))->sin6_addr); 9347e3957d1Sbluhm ifa = ifa6 ? &ifa6->ia_ifa : NULL; 935287546eaSitojun if (ifa) { 936287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 937f6e55599Sitojun ln->ln_byhint = 0; 938334bfa0aSmpi rt->rt_expire = 0; 939fac399ceSmpi KASSERT(ifa == rt->rt_ifa); 940f4f4d166Sitojun } else if (rt->rt_flags & RTF_ANNOUNCE) { 941f4f4d166Sitojun ln->ln_state = ND6_LLINFO_REACHABLE; 942f6e55599Sitojun ln->ln_byhint = 0; 943334bfa0aSmpi rt->rt_expire = 0; 944f4f4d166Sitojun 945f4f4d166Sitojun /* join solicited node multicast for proxy ND */ 946f4f4d166Sitojun if (ifp->if_flags & IFF_MULTICAST) { 947f4f4d166Sitojun struct in6_addr llsol; 948f4f4d166Sitojun int error; 949f4f4d166Sitojun 950c3c56496Sbluhm llsol = satosin6(rt_key(rt))->sin6_addr; 951f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 952f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 953f4f4d166Sitojun llsol.s6_addr32[1] = 0; 954f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 955f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 956f4f4d166Sitojun 957d8a7e3a7Sitojun if (in6_addmulti(&llsol, ifp, &error)) { 958bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 959d8a7e3a7Sitojun nd6log((LOG_ERR, "%s: failed to join " 960d8a7e3a7Sitojun "%s (errno=%d)\n", ifp->if_xname, 961bbcf0337Smpi inet_ntop(AF_INET6, &llsol, 962bbcf0337Smpi addr, sizeof(addr)), 963bbcf0337Smpi error)); 964d8a7e3a7Sitojun } 965f4f4d166Sitojun } 966287546eaSitojun } 967287546eaSitojun break; 968287546eaSitojun 969287546eaSitojun case RTM_DELETE: 9709c0643cdSbluhm if (ln == NULL) 971287546eaSitojun break; 972f4f4d166Sitojun /* leave from solicited node multicast for proxy ND */ 973f4f4d166Sitojun if ((rt->rt_flags & RTF_ANNOUNCE) != 0 && 974f4f4d166Sitojun (ifp->if_flags & IFF_MULTICAST) != 0) { 975f4f4d166Sitojun struct in6_addr llsol; 976f4f4d166Sitojun struct in6_multi *in6m; 977f4f4d166Sitojun 978c3c56496Sbluhm llsol = satosin6(rt_key(rt))->sin6_addr; 979f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 980f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 981f4f4d166Sitojun llsol.s6_addr32[1] = 0; 982f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 983f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 984f4f4d166Sitojun 985f4f4d166Sitojun IN6_LOOKUP_MULTI(llsol, ifp, in6m); 986f4f4d166Sitojun if (in6m) 987f4f4d166Sitojun in6_delmulti(in6m); 988f4f4d166Sitojun } 989287546eaSitojun nd6_inuse--; 99092c821ddSbluhm TAILQ_REMOVE(&nd6_list, ln, ln_list); 991334bfa0aSmpi rt->rt_expire = 0; 9929c0643cdSbluhm rt->rt_llinfo = NULL; 993287546eaSitojun rt->rt_flags &= ~RTF_LLINFO; 994287546eaSitojun m_freem(ln->ln_hold); 99593fbd125Sbluhm pool_put(&nd6_pool, ln); 996c370e97fSmpi break; 997c370e97fSmpi 998c370e97fSmpi case RTM_INVALIDATE: 999b5675ff3Skrw if (ln == NULL) 1000b5675ff3Skrw break; 1001ad57c59cSbluhm if (!ISSET(rt->rt_flags, RTF_LOCAL)) 1002c370e97fSmpi nd6_invalidate(rt); 1003c370e97fSmpi break; 1004287546eaSitojun } 1005287546eaSitojun } 1006287546eaSitojun 1007287546eaSitojun int 1008ee37ea65Smcbride nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp) 1009287546eaSitojun { 1010287546eaSitojun struct in6_ndireq *ndi = (struct in6_ndireq *)data; 1011287546eaSitojun struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data; 1012287546eaSitojun struct rtentry *rt; 1013287546eaSitojun 1014287546eaSitojun switch (cmd) { 1015d6b9e9b9Sitojun case SIOCGIFINFO_IN6: 10166a1c2aefSbluhm NET_LOCK_SHARED(); 1017d6b9e9b9Sitojun ndi->ndi = *ND_IFINFO(ifp); 10186a1c2aefSbluhm NET_UNLOCK_SHARED(); 1019dd66399bStb return (0); 1020287546eaSitojun case SIOCGNBRINFO_IN6: 1021287546eaSitojun { 1022287546eaSitojun struct llinfo_nd6 *ln; 1023287546eaSitojun struct in6_addr nb_addr = nbi->addr; /* make local for safety */ 1024f303499dSdlg time_t expire; 1025287546eaSitojun 10266a1c2aefSbluhm NET_LOCK_SHARED(); 1027287546eaSitojun /* 1028287546eaSitojun * XXX: KAME specific hack for scoped addresses 1029287546eaSitojun * XXXX: for other scopes than link-local? 1030287546eaSitojun */ 1031a37edb63Skn if (IN6_IS_ADDR_LINKLOCAL(&nb_addr) || 1032a37edb63Skn IN6_IS_ADDR_MC_LINKLOCAL(&nb_addr)) { 1033287546eaSitojun u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2]; 1034287546eaSitojun 1035287546eaSitojun if (*idp == 0) 1036287546eaSitojun *idp = htons(ifp->if_index); 1037287546eaSitojun } 1038287546eaSitojun 103916119bbfSmpi rt = nd6_lookup(&nb_addr, 0, ifp, ifp->if_rdomain); 104016119bbfSmpi if (rt == NULL || 1041d8a7e3a7Sitojun (ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) { 104216119bbfSmpi rtfree(rt); 10436a1c2aefSbluhm NET_UNLOCK_SHARED(); 1044dd66399bStb return (EINVAL); 1045287546eaSitojun } 10463bc414e3Sdlg expire = ln->ln_rt->rt_expire; 1047f303499dSdlg if (expire != 0) { 10483209772dScheloha expire -= getuptime(); 10493209772dScheloha expire += gettime(); 1050f303499dSdlg } 1051f303499dSdlg 1052287546eaSitojun nbi->state = ln->ln_state; 1053287546eaSitojun nbi->asked = ln->ln_asked; 1054287546eaSitojun nbi->isrouter = ln->ln_router; 1055f303499dSdlg nbi->expire = expire; 1056287546eaSitojun 1057dd66399bStb rtfree(rt); 10586a1c2aefSbluhm NET_UNLOCK_SHARED(); 1059dd66399bStb return (0); 1060287546eaSitojun } 1061287546eaSitojun } 1062dd66399bStb return (0); 1063287546eaSitojun } 1064287546eaSitojun 1065287546eaSitojun /* 1066287546eaSitojun * Create neighbor cache entry and cache link-layer address, 1067287546eaSitojun * on reception of inbound ND6 packets. (RS/RA/NS/redirect) 1068ee37ea65Smcbride * 1069ee37ea65Smcbride * type - ICMP6 type 1070ee37ea65Smcbride * code - type dependent information 1071287546eaSitojun */ 1072db435b2aSmpi void 1073b7607505Skn nd6_cache_lladdr(struct ifnet *ifp, const struct in6_addr *from, char *lladdr, 1074ee37ea65Smcbride int lladdrlen, int type, int code) 1075287546eaSitojun { 1076287546eaSitojun struct rtentry *rt = NULL; 1077287546eaSitojun struct llinfo_nd6 *ln = NULL; 1078287546eaSitojun int is_newentry; 1079287546eaSitojun struct sockaddr_dl *sdl = NULL; 1080287546eaSitojun int do_update; 1081287546eaSitojun int olladdr; 1082287546eaSitojun int llchange; 1083287546eaSitojun int newstate = 0; 1084287546eaSitojun 1085287546eaSitojun if (!ifp) 1086ab0ea4a9Snayden panic("%s: ifp == NULL", __func__); 1087287546eaSitojun if (!from) 1088ab0ea4a9Snayden panic("%s: from == NULL", __func__); 1089287546eaSitojun 1090287546eaSitojun /* nothing must be updated for unspecified address */ 1091287546eaSitojun if (IN6_IS_ADDR_UNSPECIFIED(from)) 1092db435b2aSmpi return; 1093287546eaSitojun 1094287546eaSitojun /* 1095287546eaSitojun * Validation about ifp->if_addrlen and lladdrlen must be done in 1096287546eaSitojun * the caller. 1097287546eaSitojun * 10988b542bbeSpascoe * XXX If the link does not have link-layer address, what should 1099287546eaSitojun * we do? (ifp->if_addrlen == 0) 1100287546eaSitojun * Spec says nothing in sections for RA, RS and NA. There's small 1101287546eaSitojun * description on it in NS section (RFC 2461 7.2.3). 1102287546eaSitojun */ 1103287546eaSitojun 1104f4d1af37Smikeb rt = nd6_lookup(from, 0, ifp, ifp->if_rdomain); 110516119bbfSmpi if (rt == NULL) { 11065148b194Smpi rt = nd6_lookup(from, 1, ifp, ifp->if_rdomain); 1107287546eaSitojun is_newentry = 1; 11080a2c5741Sitojun } else { 11098e6c5245Smpi /* do not overwrite local or static entry */ 11108e6c5245Smpi if (ISSET(rt->rt_flags, RTF_STATIC|RTF_LOCAL)) { 111116119bbfSmpi rtfree(rt); 1112db435b2aSmpi return; 111316119bbfSmpi } 1114287546eaSitojun is_newentry = 0; 11150a2c5741Sitojun } 1116287546eaSitojun 1117287546eaSitojun if (!rt) 1118db435b2aSmpi return; 1119287546eaSitojun if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) { 1120287546eaSitojun fail: 112118e33022Sbluhm nd6_free(rt); 112216119bbfSmpi rtfree(rt); 1123db435b2aSmpi return; 1124287546eaSitojun } 1125287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 11269c0643cdSbluhm if (ln == NULL) 1127287546eaSitojun goto fail; 11289c0643cdSbluhm if (rt->rt_gateway == NULL) 1129287546eaSitojun goto fail; 1130287546eaSitojun if (rt->rt_gateway->sa_family != AF_LINK) 1131287546eaSitojun goto fail; 1132c7b7b779Sbluhm sdl = satosdl(rt->rt_gateway); 1133287546eaSitojun 1134287546eaSitojun olladdr = (sdl->sdl_alen) ? 1 : 0; 1135287546eaSitojun if (olladdr && lladdr) { 1136287546eaSitojun if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 1137287546eaSitojun llchange = 1; 1138287546eaSitojun else 1139287546eaSitojun llchange = 0; 1140287546eaSitojun } else 1141287546eaSitojun llchange = 0; 1142287546eaSitojun 1143287546eaSitojun /* 1144287546eaSitojun * newentry olladdr lladdr llchange (*=record) 1145287546eaSitojun * 0 n n -- (1) 1146287546eaSitojun * 0 y n -- (2) 1147287546eaSitojun * 0 n y -- (3) * STALE 1148287546eaSitojun * 0 y y n (4) * 1149287546eaSitojun * 0 y y y (5) * STALE 1150287546eaSitojun * 1 -- n -- (6) NOSTATE(= PASSIVE) 1151287546eaSitojun * 1 -- y -- (7) * STALE 1152287546eaSitojun */ 1153287546eaSitojun 1154c8a7c9e3Sbluhm if (llchange) { 1155bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 1156c8a7c9e3Sbluhm log(LOG_INFO, "ndp info overwritten for %s by %s on %s\n", 1157bbcf0337Smpi inet_ntop(AF_INET6, from, addr, sizeof(addr)), 1158bbcf0337Smpi ether_sprintf(lladdr), ifp->if_xname); 1159c8a7c9e3Sbluhm } 1160287546eaSitojun if (lladdr) { /* (3-5) and (7) */ 1161287546eaSitojun /* 1162287546eaSitojun * Record source link-layer address 1163287546eaSitojun * XXX is it dependent to ifp->if_type? 1164287546eaSitojun */ 1165287546eaSitojun sdl->sdl_alen = ifp->if_addrlen; 1166287546eaSitojun bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 1167287546eaSitojun } 1168287546eaSitojun 1169287546eaSitojun if (!is_newentry) { 1170d8a7e3a7Sitojun if ((!olladdr && lladdr) || /* (3) */ 1171d8a7e3a7Sitojun (olladdr && lladdr && llchange)) { /* (5) */ 1172287546eaSitojun do_update = 1; 1173287546eaSitojun newstate = ND6_LLINFO_STALE; 1174287546eaSitojun } else /* (1-2,4) */ 1175287546eaSitojun do_update = 0; 1176287546eaSitojun } else { 1177287546eaSitojun do_update = 1; 1178287546eaSitojun if (!lladdr) /* (6) */ 1179287546eaSitojun newstate = ND6_LLINFO_NOSTATE; 1180287546eaSitojun else /* (7) */ 1181287546eaSitojun newstate = ND6_LLINFO_STALE; 1182287546eaSitojun } 1183287546eaSitojun 1184287546eaSitojun if (do_update) { 1185287546eaSitojun /* 1186287546eaSitojun * Update the state of the neighbor cache. 1187287546eaSitojun */ 1188287546eaSitojun ln->ln_state = newstate; 1189287546eaSitojun 1190287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 11918a7bb304Sitojun /* 119253b39a0bSmpi * Since nd6_resolve() in ifp->if_output() will cause 11938b542bbeSpascoe * state transition to DELAY and reset the timer, 11948a7bb304Sitojun * we must set the timer now, although it is actually 11958a7bb304Sitojun * meaningless. 11968a7bb304Sitojun */ 1197134b71fcSdlg nd6_llinfo_settimer(ln, nd6_gctimer); 11988a7bb304Sitojun 1199287546eaSitojun if (ln->ln_hold) { 1200e212adedSkrw struct mbuf *n = ln->ln_hold; 1201e212adedSkrw ln->ln_hold = NULL; 12026afad192Sitojun /* 12036afad192Sitojun * we assume ifp is not a p2p here, so just 12046afad192Sitojun * set the 2nd argument as the 1st one. 12056afad192Sitojun */ 120653b39a0bSmpi ifp->if_output(ifp, n, rt_key(rt), rt); 1207e212adedSkrw if (ln->ln_hold == n) { 1208e212adedSkrw /* n is back in ln_hold. Discard. */ 1209e212adedSkrw m_freem(ln->ln_hold); 12108a7bb304Sitojun ln->ln_hold = NULL; 1211287546eaSitojun } 1212e212adedSkrw } 1213287546eaSitojun } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 1214287546eaSitojun /* probe right away */ 1215334bfa0aSmpi nd6_llinfo_settimer(ln, 0); 1216287546eaSitojun } 1217287546eaSitojun } 1218287546eaSitojun 1219287546eaSitojun /* 1220287546eaSitojun * ICMP6 type dependent behavior. 1221287546eaSitojun * 1222287546eaSitojun * NS: clear IsRouter if new entry 1223287546eaSitojun * RS: clear IsRouter 1224287546eaSitojun * RA: set IsRouter if there's lladdr 1225287546eaSitojun * redir: clear IsRouter if new entry 1226287546eaSitojun * 1227287546eaSitojun * RA case, (1): 1228287546eaSitojun * The spec says that we must set IsRouter in the following cases: 1229287546eaSitojun * - If lladdr exist, set IsRouter. This means (1-5). 1230287546eaSitojun * - If it is old entry (!newentry), set IsRouter. This means (7). 1231287546eaSitojun * So, based on the spec, in (1-5) and (7) cases we must set IsRouter. 12328b542bbeSpascoe * A question arises for (1) case. (1) case has no lladdr in the 1233287546eaSitojun * neighbor cache, this is similar to (6). 1234287546eaSitojun * This case is rare but we figured that we MUST NOT set IsRouter. 1235287546eaSitojun * 1236287546eaSitojun * newentry olladdr lladdr llchange NS RS RA redir 1237287546eaSitojun * D R 1238287546eaSitojun * 0 n n -- (1) c ? s 1239287546eaSitojun * 0 y n -- (2) c s s 1240287546eaSitojun * 0 n y -- (3) c s s 1241287546eaSitojun * 0 y y n (4) c s s 1242287546eaSitojun * 0 y y y (5) c s s 1243287546eaSitojun * 1 -- n -- (6) c c c s 1244287546eaSitojun * 1 -- y -- (7) c c s c s 1245287546eaSitojun * 1246287546eaSitojun * (c=clear s=set) 1247287546eaSitojun */ 1248287546eaSitojun switch (type & 0xff) { 1249287546eaSitojun case ND_NEIGHBOR_SOLICIT: 1250287546eaSitojun /* 1251287546eaSitojun * New entry must have is_router flag cleared. 1252287546eaSitojun */ 1253287546eaSitojun if (is_newentry) /* (6-7) */ 1254287546eaSitojun ln->ln_router = 0; 1255287546eaSitojun break; 1256287546eaSitojun case ND_REDIRECT: 1257287546eaSitojun /* 1258287546eaSitojun * If the icmp is a redirect to a better router, always set the 1259287546eaSitojun * is_router flag. Otherwise, if the entry is newly created, 1260287546eaSitojun * clear the flag. [RFC 2461, sec 8.3] 1261287546eaSitojun */ 1262287546eaSitojun if (code == ND_REDIRECT_ROUTER) 1263287546eaSitojun ln->ln_router = 1; 1264287546eaSitojun else if (is_newentry) /* (6-7) */ 1265287546eaSitojun ln->ln_router = 0; 1266287546eaSitojun break; 1267287546eaSitojun case ND_ROUTER_SOLICIT: 1268287546eaSitojun /* 1269287546eaSitojun * is_router flag must always be cleared. 1270287546eaSitojun */ 1271287546eaSitojun ln->ln_router = 0; 1272287546eaSitojun break; 1273287546eaSitojun case ND_ROUTER_ADVERT: 1274287546eaSitojun /* 1275287546eaSitojun * Mark an entry with lladdr as a router. 1276287546eaSitojun */ 1277d8a7e3a7Sitojun if ((!is_newentry && (olladdr || lladdr)) || /* (2-5) */ 1278d8a7e3a7Sitojun (is_newentry && lladdr)) { /* (7) */ 1279287546eaSitojun ln->ln_router = 1; 1280287546eaSitojun } 1281287546eaSitojun break; 1282287546eaSitojun } 1283287546eaSitojun 128416119bbfSmpi rtfree(rt); 1285287546eaSitojun } 1286287546eaSitojun 1287a0aa363cSjsing void 1288ee37ea65Smcbride nd6_slowtimo(void *ignored_arg) 1289287546eaSitojun { 1290b3c1e4c1Sitojun struct nd_ifinfo *nd6if; 1291d6b9e9b9Sitojun struct ifnet *ifp; 129222e88dadSmpi 1293aa28b9a6Smpi NET_LOCK(); 1294287546eaSitojun 129529e86e5eSblambert timeout_add_sec(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL); 129622e88dadSmpi 1297ccb45f8eSkn TAILQ_FOREACH(ifp, &ifnetlist, if_list) { 1298d6b9e9b9Sitojun nd6if = ND_IFINFO(ifp); 1299287546eaSitojun if (nd6if->basereachable && /* already initialized */ 1300287546eaSitojun (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) { 1301287546eaSitojun /* 1302287546eaSitojun * Since reachable time rarely changes by router 1303287546eaSitojun * advertisements, we SHOULD insure that a new random 1304287546eaSitojun * value gets recomputed at least once every few hours. 1305287546eaSitojun * (RFC 2461, 6.3.4) 1306287546eaSitojun */ 1307185986d5Skn nd6if->recalctm = ND6_RECALC_REACHTM_INTERVAL; 1308287546eaSitojun nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable); 1309287546eaSitojun } 1310287546eaSitojun } 1311aa28b9a6Smpi NET_UNLOCK(); 1312287546eaSitojun } 1313287546eaSitojun 1314287546eaSitojun int 13155d32b3a0Smpi nd6_resolve(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m, 13165d32b3a0Smpi struct sockaddr *dst, u_char *desten) 13175d32b3a0Smpi { 13185d32b3a0Smpi struct sockaddr_dl *sdl; 13195d32b3a0Smpi struct rtentry *rt; 1320287546eaSitojun struct llinfo_nd6 *ln = NULL; 1321287546eaSitojun 13225d32b3a0Smpi if (m->m_flags & M_MCAST) { 13235d32b3a0Smpi ETHER_MAP_IPV6_MULTICAST(&satosin6(dst)->sin6_addr, desten); 13245d32b3a0Smpi return (0); 13255d32b3a0Smpi } 13265b3a2895Ssthen 1327c370e97fSmpi rt = rt_getll(rt0); 1328c370e97fSmpi 1329c370e97fSmpi if (ISSET(rt->rt_flags, RTF_REJECT) && 13303209772dScheloha (rt->rt_expire == 0 || getuptime() < rt->rt_expire)) { 13318c023157Smpi m_freem(m); 1332c370e97fSmpi return (rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 1333287546eaSitojun } 1334cfb6b8dfSitojun 1335287546eaSitojun /* 1336287546eaSitojun * Address resolution or Neighbor Unreachability Detection 1337287546eaSitojun * for the next hop. 1338287546eaSitojun * At this point, the destination of the packet must be a unicast 1339287546eaSitojun * or an anycast address(i.e. not a multicast). 1340287546eaSitojun */ 13415da3fb44Smpi if (!ISSET(rt->rt_flags, RTF_LLINFO)) { 1342bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 13435da3fb44Smpi log(LOG_DEBUG, "%s: %s: route contains no ND information\n", 13445da3fb44Smpi __func__, inet_ntop(AF_INET6, 13455da3fb44Smpi &satosin6(rt_key(rt))->sin6_addr, addr, sizeof(addr))); 134616119bbfSmpi m_freem(m); 13475da3fb44Smpi return (EINVAL); 1348287546eaSitojun } 1349287546eaSitojun 13505d32b3a0Smpi if (rt->rt_gateway->sa_family != AF_LINK) { 13515d32b3a0Smpi printf("%s: something odd happens\n", __func__); 13525d32b3a0Smpi m_freem(m); 13535d32b3a0Smpi return (EINVAL); 13545d32b3a0Smpi } 13555d32b3a0Smpi 13565da3fb44Smpi ln = (struct llinfo_nd6 *)rt->rt_llinfo; 13575da3fb44Smpi KASSERT(ln != NULL); 1358cfb6b8dfSitojun 1359f3fcf2f3Smcbride /* 1360f3fcf2f3Smcbride * Move this entry to the head of the queue so that it is less likely 1361f3fcf2f3Smcbride * for this entry to be a target of forced garbage collection (see 1362f3fcf2f3Smcbride * nd6_rtrequest()). 1363f3fcf2f3Smcbride */ 136492c821ddSbluhm TAILQ_REMOVE(&nd6_list, ln, ln_list); 136592c821ddSbluhm TAILQ_INSERT_HEAD(&nd6_list, ln, ln_list); 1366f3fcf2f3Smcbride 1367287546eaSitojun /* 1368287546eaSitojun * The first time we send a packet to a neighbor whose entry is 13693bb2119cSkn * STALE, we have to change the state to DELAY and set a timer to 13703bb2119cSkn * expire in DELAY_FIRST_PROBE_TIME seconds to ensure we do 1371287546eaSitojun * neighbor unreachability detection on expiration. 1372287546eaSitojun * (RFC 2461 7.3.3) 1373287546eaSitojun */ 1374287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 1375287546eaSitojun ln->ln_asked = 0; 1376287546eaSitojun ln->ln_state = ND6_LLINFO_DELAY; 1377134b71fcSdlg nd6_llinfo_settimer(ln, nd6_delay); 1378287546eaSitojun } 1379287546eaSitojun 1380287546eaSitojun /* 1381287546eaSitojun * If the neighbor cache entry has a state other than INCOMPLETE 138234deef1eSitojun * (i.e. its link-layer address is already resolved), just 1383287546eaSitojun * send the packet. 1384287546eaSitojun */ 13855d32b3a0Smpi if (ln->ln_state > ND6_LLINFO_INCOMPLETE) { 13865d32b3a0Smpi sdl = satosdl(rt->rt_gateway); 13875d32b3a0Smpi if (sdl->sdl_alen != ETHER_ADDR_LEN) { 13885d32b3a0Smpi char addr[INET6_ADDRSTRLEN]; 13895d32b3a0Smpi log(LOG_DEBUG, "%s: %s: incorrect nd6 information\n", 13905d32b3a0Smpi __func__, 13915d32b3a0Smpi inet_ntop(AF_INET6, &satosin6(dst)->sin6_addr, 13925d32b3a0Smpi addr, sizeof(addr))); 13935d32b3a0Smpi m_freem(m); 13945d32b3a0Smpi return (EINVAL); 13955d32b3a0Smpi } 13965d32b3a0Smpi 13975d32b3a0Smpi bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 13985d32b3a0Smpi return (0); 13995d32b3a0Smpi } 1400287546eaSitojun 1401287546eaSitojun /* 1402287546eaSitojun * There is a neighbor cache entry, but no ethernet address 1403287546eaSitojun * response yet. Replace the held mbuf (if any) with this 1404287546eaSitojun * latest one. 1405287546eaSitojun */ 1406efcf292bSitojun if (ln->ln_state == ND6_LLINFO_NOSTATE) 1407287546eaSitojun ln->ln_state = ND6_LLINFO_INCOMPLETE; 1408287546eaSitojun m_freem(ln->ln_hold); 1409287546eaSitojun ln->ln_hold = m; 14105d32b3a0Smpi 141176843262Sitojun /* 141276843262Sitojun * If there has been no NS for the neighbor after entering the 141376843262Sitojun * INCOMPLETE state, send the first solicitation. 141476843262Sitojun */ 14159631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln) && ln->ln_asked == 0) { 1416287546eaSitojun ln->ln_asked++; 1417134b71fcSdlg nd6_llinfo_settimer(ln, ND_IFINFO(ifp)->retrans / 1000); 14185d32b3a0Smpi nd6_ns_output(ifp, NULL, &satosin6(dst)->sin6_addr, ln, 0); 1419287546eaSitojun } 14205d32b3a0Smpi return (EAGAIN); 1421287546eaSitojun } 1422287546eaSitojun 1423287546eaSitojun int 1424ee37ea65Smcbride nd6_need_cache(struct ifnet *ifp) 1425d8a7e3a7Sitojun { 1426d8a7e3a7Sitojun /* 1427d8a7e3a7Sitojun * RFC2893 says: 1428d8a7e3a7Sitojun * - unidirectional tunnels needs no ND 1429d8a7e3a7Sitojun */ 1430d8a7e3a7Sitojun switch (ifp->if_type) { 1431d8a7e3a7Sitojun case IFT_ETHER: 1432d8a7e3a7Sitojun case IFT_IEEE80211: 1433f4433d56Shenning case IFT_CARP: 1434d8a7e3a7Sitojun return (1); 1435d8a7e3a7Sitojun default: 1436d8a7e3a7Sitojun return (0); 1437d8a7e3a7Sitojun } 1438d8a7e3a7Sitojun } 1439