1*c6bbd2a8Sflorian /* $OpenBSD: nd6.c,v 1.214 2017/08/08 18:15:58 florian 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> 48*c6bbd2a8Sflorian #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 */ 70*c6bbd2a8Sflorian time_t nd6_expire_time = -1; /* at which time_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 */ 8992c821ddSbluhm int nd6_inuse, nd6_allocated; 90287546eaSitojun 91287546eaSitojun int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL; 92287546eaSitojun 93a0aa363cSjsing void nd6_slowtimo(void *); 94088d4855Smpi void nd6_expire(void *); 95088d4855Smpi void nd6_expire_timer(void *); 96c370e97fSmpi void nd6_invalidate(struct rtentry *); 9718e33022Sbluhm void nd6_free(struct rtentry *); 98a0aa363cSjsing void nd6_llinfo_timer(void *); 99287546eaSitojun 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 */ 12322e88dadSmpi timeout_set_proc(&nd6_slowtimo_ch, nd6_slowtimo, NULL); 12429e86e5eSblambert timeout_add_sec(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL); 125088d4855Smpi timeout_set(&nd6_expire_timeout, nd6_expire_timer, NULL); 126287546eaSitojun } 127287546eaSitojun 128d6b9e9b9Sitojun struct nd_ifinfo * 129ee37ea65Smcbride nd6_ifattach(struct ifnet *ifp) 130287546eaSitojun { 131d6b9e9b9Sitojun struct nd_ifinfo *nd; 132287546eaSitojun 133393af863Skrw nd = malloc(sizeof(*nd), M_IP6NDP, M_WAITOK | M_ZERO); 134287546eaSitojun 135d6b9e9b9Sitojun nd->initialized = 1; 136287546eaSitojun 137d6b9e9b9Sitojun nd->basereachable = REACHABLE_TIME; 138d6b9e9b9Sitojun nd->reachable = ND_COMPUTE_RTIME(nd->basereachable); 139d6b9e9b9Sitojun nd->retrans = RETRANS_TIMER; 1402a4a63f1Shenning /* per-interface IFXF_AUTOCONF6 needs to be set too to accept RAs */ 141d8a7e3a7Sitojun nd->flags = (ND6_IFF_PERFORMNUD | ND6_IFF_ACCEPT_RTADV); 1421b5f410aSitojun 143d6b9e9b9Sitojun return nd; 144287546eaSitojun } 145287546eaSitojun 146d6b9e9b9Sitojun void 147ee37ea65Smcbride nd6_ifdetach(struct nd_ifinfo *nd) 148d6b9e9b9Sitojun { 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) 177bc84bce2Skrw panic("ndopts == NULL in nd6_option"); 178287546eaSitojun if (!ndopts->nd_opts_last) 179bc84bce2Skrw panic("uninitialized ndopts in nd6_option"); 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) 228bc84bce2Skrw panic("ndopts == NULL in nd6_options"); 229287546eaSitojun if (!ndopts->nd_opts_last) 230bc84bce2Skrw panic("uninitialized ndopts in nd6_options"); 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; 272287546eaSitojun default: 273287546eaSitojun /* 274287546eaSitojun * Unknown options must be silently ignored, 275e4d25771Stodd * to accommodate future extension to the protocol. 276287546eaSitojun */ 277b79da24aSitojun nd6log((LOG_DEBUG, 278287546eaSitojun "nd6_options: unsupported option %d - " 279b79da24aSitojun "option ignored\n", nd_opt->nd_opt_type)); 280287546eaSitojun } 281287546eaSitojun 282287546eaSitojun skip1: 283287546eaSitojun i++; 284287546eaSitojun if (i > nd6_maxndopt) { 28507ba5f7cSjca icmp6stat_inc(icp6s_nd_toomanyopt); 286b79da24aSitojun nd6log((LOG_INFO, "too many loop in nd opt\n")); 287287546eaSitojun break; 288287546eaSitojun } 289287546eaSitojun 290287546eaSitojun if (ndopts->nd_opts_done) 291287546eaSitojun break; 292287546eaSitojun } 293287546eaSitojun 294287546eaSitojun return 0; 295287546eaSitojun } 296287546eaSitojun 297287546eaSitojun /* 2989631a17bSitojun * ND6 timer routine to handle ND6 entries 299287546eaSitojun */ 300287546eaSitojun void 301134b71fcSdlg nd6_llinfo_settimer(struct llinfo_nd6 *ln, int secs) 3029631a17bSitojun { 303134b71fcSdlg if (secs < 0) { 3043bc414e3Sdlg ln->ln_rt->rt_expire = 0; 3059631a17bSitojun timeout_del(&ln->ln_timer_ch); 3069631a17bSitojun } else { 3073bc414e3Sdlg ln->ln_rt->rt_expire = time_uptime + secs; 308134b71fcSdlg timeout_add_sec(&ln->ln_timer_ch, secs); 3099631a17bSitojun } 3109631a17bSitojun } 3119631a17bSitojun 312a0aa363cSjsing void 3139631a17bSitojun nd6_llinfo_timer(void *arg) 314287546eaSitojun { 315287546eaSitojun int s; 316b3c1e4c1Sitojun struct llinfo_nd6 *ln; 317287546eaSitojun struct rtentry *rt; 318287546eaSitojun struct sockaddr_in6 *dst; 3199631a17bSitojun struct ifnet *ifp; 320d374aaacSitojun struct nd_ifinfo *ndi = NULL; 321287546eaSitojun 3222b4720fcSmpi NET_LOCK(s); 3239631a17bSitojun 3249631a17bSitojun ln = (struct llinfo_nd6 *)arg; 3259631a17bSitojun 3269631a17bSitojun if ((rt = ln->ln_rt) == NULL) 3279631a17bSitojun panic("ln->ln_rt == NULL"); 32847773228Sjsg if ((ifp = if_get(rt->rt_ifidx)) == NULL) { 3292b4720fcSmpi NET_UNLOCK(s); 330f5e0f62bSmpi return; 33147773228Sjsg } 332d6b9e9b9Sitojun ndi = ND_IFINFO(ifp); 333c3c56496Sbluhm dst = satosin6(rt_key(rt)); 334287546eaSitojun 335287546eaSitojun /* sanity check */ 3369c0643cdSbluhm if (rt->rt_llinfo != NULL && (struct llinfo_nd6 *)rt->rt_llinfo != ln) 337bc84bce2Skrw panic("rt_llinfo(%p) is not equal to ln(%p)", 338d374aaacSitojun rt->rt_llinfo, ln); 339287546eaSitojun if (!dst) 340bc84bce2Skrw panic("dst=0 in nd6_timer(ln=%p)", ln); 341287546eaSitojun 342287546eaSitojun switch (ln->ln_state) { 343287546eaSitojun case ND6_LLINFO_INCOMPLETE: 344287546eaSitojun if (ln->ln_asked < nd6_mmaxtries) { 345287546eaSitojun ln->ln_asked++; 346134b71fcSdlg nd6_llinfo_settimer(ln, ndi->retrans / 1000); 3479631a17bSitojun nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 348287546eaSitojun } else { 349287546eaSitojun struct mbuf *m = ln->ln_hold; 350287546eaSitojun if (m) { 3518294a4dfSitojun ln->ln_hold = NULL; 352287546eaSitojun /* 353d8a7e3a7Sitojun * Fake rcvif to make the ICMP error 354d8a7e3a7Sitojun * more helpful in diagnosing for the 355d8a7e3a7Sitojun * receiver. 356287546eaSitojun * XXX: should we consider 357287546eaSitojun * older rcvif? 358287546eaSitojun */ 35928112c65Smpi m->m_pkthdr.ph_ifidx = rt->rt_ifidx; 360d8a7e3a7Sitojun 361287546eaSitojun icmp6_error(m, ICMP6_DST_UNREACH, 362287546eaSitojun ICMP6_DST_UNREACH_ADDR, 0); 363e212adedSkrw if (ln->ln_hold == m) { 364e212adedSkrw /* m is back in ln_hold. Discard. */ 365e212adedSkrw m_freem(ln->ln_hold); 366e212adedSkrw ln->ln_hold = NULL; 367e212adedSkrw } 368287546eaSitojun } 36918e33022Sbluhm nd6_free(rt); 3709631a17bSitojun ln = NULL; 371287546eaSitojun } 372287546eaSitojun break; 373287546eaSitojun case ND6_LLINFO_REACHABLE: 3749631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 375287546eaSitojun ln->ln_state = ND6_LLINFO_STALE; 376134b71fcSdlg nd6_llinfo_settimer(ln, nd6_gctimer); 377be4e9e12Sitojun } 378287546eaSitojun break; 379be4e9e12Sitojun 380be4e9e12Sitojun case ND6_LLINFO_STALE: 381f3fcf2f3Smcbride case ND6_LLINFO_PURGE: 382be4e9e12Sitojun /* Garbage Collection(RFC 2461 5.3) */ 3839631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 38418e33022Sbluhm nd6_free(rt); 3859631a17bSitojun ln = NULL; 3869631a17bSitojun } 387be4e9e12Sitojun break; 388be4e9e12Sitojun 389287546eaSitojun case ND6_LLINFO_DELAY: 390d374aaacSitojun if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) { 391d374aaacSitojun /* We need NUD */ 392287546eaSitojun ln->ln_asked = 1; 393287546eaSitojun ln->ln_state = ND6_LLINFO_PROBE; 394134b71fcSdlg nd6_llinfo_settimer(ln, ndi->retrans / 1000); 395d374aaacSitojun nd6_ns_output(ifp, &dst->sin6_addr, 396d8a7e3a7Sitojun &dst->sin6_addr, ln, 0); 397be4e9e12Sitojun } else { 398d374aaacSitojun ln->ln_state = ND6_LLINFO_STALE; /* XXX */ 399134b71fcSdlg nd6_llinfo_settimer(ln, nd6_gctimer); 400be4e9e12Sitojun } 401287546eaSitojun break; 402287546eaSitojun case ND6_LLINFO_PROBE: 403287546eaSitojun if (ln->ln_asked < nd6_umaxtries) { 404287546eaSitojun ln->ln_asked++; 405134b71fcSdlg nd6_llinfo_settimer(ln, ndi->retrans / 1000); 406287546eaSitojun nd6_ns_output(ifp, &dst->sin6_addr, 407287546eaSitojun &dst->sin6_addr, ln, 0); 408d8a7e3a7Sitojun } else { 40918e33022Sbluhm nd6_free(rt); 4109631a17bSitojun ln = NULL; 411d8a7e3a7Sitojun } 412287546eaSitojun break; 413287546eaSitojun } 4149631a17bSitojun 415f5e0f62bSmpi if_put(ifp); 4162b4720fcSmpi NET_UNLOCK(s); 417287546eaSitojun } 418287546eaSitojun 419*c6bbd2a8Sflorian void 420*c6bbd2a8Sflorian nd6_expire_timer_update(struct in6_ifaddr *ia6) 421*c6bbd2a8Sflorian { 422*c6bbd2a8Sflorian time_t expire_time = INT64_MAX; 423*c6bbd2a8Sflorian int secs; 424*c6bbd2a8Sflorian 425*c6bbd2a8Sflorian KERNEL_ASSERT_LOCKED(); 426*c6bbd2a8Sflorian 427*c6bbd2a8Sflorian if (ia6->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) 428*c6bbd2a8Sflorian expire_time = ia6->ia6_lifetime.ia6t_expire; 429*c6bbd2a8Sflorian 430*c6bbd2a8Sflorian if (!(ia6->ia6_flags & IN6_IFF_DEPRECATED) && 431*c6bbd2a8Sflorian ia6->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME && 432*c6bbd2a8Sflorian expire_time > ia6->ia6_lifetime.ia6t_preferred) 433*c6bbd2a8Sflorian expire_time = ia6->ia6_lifetime.ia6t_preferred; 434*c6bbd2a8Sflorian 435*c6bbd2a8Sflorian if (expire_time == INT64_MAX) 436*c6bbd2a8Sflorian return; 437*c6bbd2a8Sflorian 438*c6bbd2a8Sflorian /* 439*c6bbd2a8Sflorian * IFA6_IS_INVALID() and IFA6_IS_DEPRECATED() check for uptime 440*c6bbd2a8Sflorian * greater than ia6t_expire or ia6t_preferred, not greater or equal. 441*c6bbd2a8Sflorian * Schedule timeout one second later so that either IFA6_IS_INVALID() 442*c6bbd2a8Sflorian * or IFA6_IS_DEPRECATED() is true. 443*c6bbd2a8Sflorian */ 444*c6bbd2a8Sflorian expire_time++; 445*c6bbd2a8Sflorian 446*c6bbd2a8Sflorian if (!timeout_pending(&nd6_expire_timeout) || nd6_expire_time > 447*c6bbd2a8Sflorian expire_time) { 448*c6bbd2a8Sflorian secs = expire_time - time_uptime; 449*c6bbd2a8Sflorian if ( secs < 0) 450*c6bbd2a8Sflorian secs = 0; 451*c6bbd2a8Sflorian 452*c6bbd2a8Sflorian timeout_add_sec(&nd6_expire_timeout, secs); 453*c6bbd2a8Sflorian nd6_expire_time = expire_time; 454*c6bbd2a8Sflorian } 455*c6bbd2a8Sflorian } 456*c6bbd2a8Sflorian 4579631a17bSitojun /* 458088d4855Smpi * Expire interface addresses. 4599631a17bSitojun */ 4609631a17bSitojun void 461088d4855Smpi nd6_expire(void *unused) 4629631a17bSitojun { 463a44d5cf0Smpi struct ifnet *ifp; 46422e88dadSmpi int s; 4659631a17bSitojun 466088d4855Smpi KERNEL_LOCK(); 46722e88dadSmpi NET_LOCK(s); 46822e88dadSmpi 469a44d5cf0Smpi TAILQ_FOREACH(ifp, &ifnet, if_list) { 470a44d5cf0Smpi struct ifaddr *ifa, *nifa; 471a44d5cf0Smpi struct in6_ifaddr *ia6; 472a44d5cf0Smpi 473a44d5cf0Smpi TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrlist, ifa_list, nifa) { 474a44d5cf0Smpi if (ifa->ifa_addr->sa_family != AF_INET6) 475a44d5cf0Smpi continue; 476a44d5cf0Smpi ia6 = ifatoia6(ifa); 477d8a7e3a7Sitojun /* check address lifetime */ 478d8a7e3a7Sitojun if (IFA6_IS_INVALID(ia6)) { 479d8a7e3a7Sitojun in6_purgeaddr(&ia6->ia_ifa); 480d8a7e3a7Sitojun } else { 481*c6bbd2a8Sflorian if (IFA6_IS_DEPRECATED(ia6)) 482*c6bbd2a8Sflorian ia6->ia6_flags |= IN6_IFF_DEPRECATED; 483*c6bbd2a8Sflorian nd6_expire_timer_update(ia6); 484d8a7e3a7Sitojun } 485d8a7e3a7Sitojun } 486a44d5cf0Smpi } 487d8a7e3a7Sitojun 48822e88dadSmpi NET_UNLOCK(s); 489088d4855Smpi KERNEL_UNLOCK(); 490287546eaSitojun } 491287546eaSitojun 492a09574ebSkettenis void 493088d4855Smpi nd6_expire_timer(void *unused) 494a09574ebSkettenis { 495088d4855Smpi task_add(softnettq, &nd6_expire_task); 496a09574ebSkettenis } 497a09574ebSkettenis 49822770369Sitojun /* 49922770369Sitojun * Nuke neighbor cache/prefix/default router management table, right before 50022770369Sitojun * ifp goes away. 50122770369Sitojun */ 50222770369Sitojun void 503ee37ea65Smcbride nd6_purge(struct ifnet *ifp) 50422770369Sitojun { 50522770369Sitojun struct llinfo_nd6 *ln, *nln; 50622770369Sitojun 50766736630Smpi NET_ASSERT_LOCKED(); 50845ffa37bSmpi 50922770369Sitojun /* 51022770369Sitojun * Nuke neighbor cache entries for the ifp. 51122770369Sitojun */ 51292c821ddSbluhm TAILQ_FOREACH_SAFE(ln, &nd6_list, ln_list, nln) { 51322770369Sitojun struct rtentry *rt; 51422770369Sitojun struct sockaddr_dl *sdl; 51522770369Sitojun 51622770369Sitojun rt = ln->ln_rt; 51792c821ddSbluhm if (rt != NULL && rt->rt_gateway != NULL && 51822770369Sitojun rt->rt_gateway->sa_family == AF_LINK) { 519c7b7b779Sbluhm sdl = satosdl(rt->rt_gateway); 52022770369Sitojun if (sdl->sdl_index == ifp->if_index) 52118e33022Sbluhm nd6_free(rt); 52222770369Sitojun } 52322770369Sitojun } 52422770369Sitojun } 52522770369Sitojun 526287546eaSitojun struct rtentry * 527f4d1af37Smikeb nd6_lookup(struct in6_addr *addr6, int create, struct ifnet *ifp, 528f4d1af37Smikeb u_int rtableid) 529287546eaSitojun { 530287546eaSitojun struct rtentry *rt; 531287546eaSitojun struct sockaddr_in6 sin6; 5325148b194Smpi int flags; 533287546eaSitojun 534287546eaSitojun bzero(&sin6, sizeof(sin6)); 535287546eaSitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 536287546eaSitojun sin6.sin6_family = AF_INET6; 537287546eaSitojun sin6.sin6_addr = *addr6; 53812d3c25cSclaudio flags = (create) ? RT_RESOLVE : 0; 539d8a7e3a7Sitojun 5405148b194Smpi rt = rtalloc(sin6tosa(&sin6), flags, rtableid); 54116119bbfSmpi if (rt != NULL && (rt->rt_flags & RTF_LLINFO) == 0) { 542287546eaSitojun /* 543287546eaSitojun * This is the case for the default route. 544287546eaSitojun * If we want to create a neighbor cache for the address, we 545287546eaSitojun * should free the route for the destination and allocate an 546287546eaSitojun * interface route. 547287546eaSitojun */ 548287546eaSitojun if (create) { 54927ae666cSmpi rtfree(rt); 55027ae666cSmpi rt = NULL; 551287546eaSitojun } 552287546eaSitojun } 55316119bbfSmpi if (rt == NULL) { 554287546eaSitojun if (create && ifp) { 555cb24f5e5Sclaudio struct rt_addrinfo info; 55666f69fe1Smpi struct ifaddr *ifa; 5570ffd01d4Sbluhm int error; 558d374aaacSitojun 559287546eaSitojun /* 560287546eaSitojun * If no route is available and create is set, 561287546eaSitojun * we allocate a host route for the destination 562287546eaSitojun * and treat it like an interface route. 563287546eaSitojun * This hack is necessary for a neighbor which can't 564287546eaSitojun * be covered by our own prefix. 565287546eaSitojun */ 56666f69fe1Smpi ifa = ifaof_ifpforaddr(sin6tosa(&sin6), ifp); 567287546eaSitojun if (ifa == NULL) 568287546eaSitojun return (NULL); 569287546eaSitojun 570287546eaSitojun /* 571287546eaSitojun * Create a new route. RTF_LLINFO is necessary 572287546eaSitojun * to create a Neighbor Cache entry for the 573287546eaSitojun * destination in nd6_rtrequest which will be 5747ffb277fSbluhm * called in rtrequest. 575287546eaSitojun */ 576cb24f5e5Sclaudio bzero(&info, sizeof(info)); 57766f69fe1Smpi info.rti_ifa = ifa; 578c29fc46aSmpi info.rti_flags = RTF_HOST | RTF_LLINFO; 579c3c56496Sbluhm info.rti_info[RTAX_DST] = sin6tosa(&sin6); 580c7b7b779Sbluhm info.rti_info[RTAX_GATEWAY] = sdltosa(ifp->if_sadl); 5817ffb277fSbluhm error = rtrequest(RTM_ADD, &info, RTP_CONNECTED, &rt, 5820ffd01d4Sbluhm rtableid); 5830ffd01d4Sbluhm if (error) 584287546eaSitojun return (NULL); 5859c0643cdSbluhm if (rt->rt_llinfo != NULL) { 586287546eaSitojun struct llinfo_nd6 *ln = 587287546eaSitojun (struct llinfo_nd6 *)rt->rt_llinfo; 588287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 589287546eaSitojun } 590f6e55599Sitojun } else 591287546eaSitojun return (NULL); 592287546eaSitojun } 593287546eaSitojun /* 594287546eaSitojun * Validation for the entry. 595d8a7e3a7Sitojun * Note that the check for rt_llinfo is necessary because a cloned 596d8a7e3a7Sitojun * route from a parent route that has the L flag (e.g. the default 597d8a7e3a7Sitojun * route to a p2p interface) may have the flag, too, while the 598d8a7e3a7Sitojun * destination is not actually a neighbor. 599287546eaSitojun */ 600287546eaSitojun if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 || 601d8a7e3a7Sitojun rt->rt_gateway->sa_family != AF_LINK || rt->rt_llinfo == NULL || 602248f6870Smpi (ifp != NULL && rt->rt_ifidx != ifp->if_index)) { 603287546eaSitojun if (create) { 604bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 60535075f95Smpi nd6log((LOG_DEBUG, "%s: failed to lookup %s (if=%s)\n", 60635075f95Smpi __func__, 607bbcf0337Smpi inet_ntop(AF_INET6, addr6, addr, sizeof(addr)), 608da592434Sitojun ifp ? ifp->if_xname : "unspec")); 609287546eaSitojun } 61016119bbfSmpi rtfree(rt); 611d8a7e3a7Sitojun return (NULL); 612287546eaSitojun } 613287546eaSitojun return (rt); 614287546eaSitojun } 615287546eaSitojun 616287546eaSitojun /* 617287546eaSitojun * Detect if a given IPv6 address identifies a neighbor on a given link. 618287546eaSitojun * XXX: should take care of the destination of a p2p link? 619287546eaSitojun */ 620287546eaSitojun int 621ee37ea65Smcbride nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp) 622287546eaSitojun { 623ef6620bcSmpi struct in6_ifaddr *ia6; 624ef6620bcSmpi struct ifaddr *ifa; 625d8a7e3a7Sitojun struct rtentry *rt; 626287546eaSitojun 627cfb6b8dfSitojun /* 628cfb6b8dfSitojun * A link-local address is always a neighbor. 629cfb6b8dfSitojun * XXX: we should use the sin6_scope_id field rather than the embedded 630cfb6b8dfSitojun * interface index. 631d8a7e3a7Sitojun * XXX: a link does not necessarily specify a single interface. 632cfb6b8dfSitojun */ 633cfb6b8dfSitojun if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) && 634cfb6b8dfSitojun ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index) 635287546eaSitojun return (1); 636287546eaSitojun 637ef6620bcSmpi TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 638ef6620bcSmpi if (ifa->ifa_addr->sa_family != AF_INET6) 639ef6620bcSmpi continue; 640ef6620bcSmpi 641ef6620bcSmpi ia6 = ifatoia6(ifa); 642ef6620bcSmpi 643ef6620bcSmpi /* Prefix check down below. */ 644ef6620bcSmpi if (ia6->ia6_flags & IN6_IFF_AUTOCONF) 645ef6620bcSmpi continue; 646ef6620bcSmpi 647ef6620bcSmpi if (IN6_ARE_MASKED_ADDR_EQUAL(&addr->sin6_addr, 648ef6620bcSmpi &ia6->ia_addr.sin6_addr, 649ef6620bcSmpi &ia6->ia_prefixmask.sin6_addr)) 650ef6620bcSmpi return (1); 651ef6620bcSmpi } 652ef6620bcSmpi 653287546eaSitojun /* 654287546eaSitojun * Even if the address matches none of our addresses, it might be 655287546eaSitojun * in the neighbor cache. 656287546eaSitojun */ 65716119bbfSmpi rt = nd6_lookup(&addr->sin6_addr, 0, ifp, ifp->if_rdomain); 65816119bbfSmpi if (rt != NULL) { 65916119bbfSmpi rtfree(rt); 660287546eaSitojun return (1); 66116119bbfSmpi } 662287546eaSitojun 663287546eaSitojun return (0); 664287546eaSitojun } 665287546eaSitojun 666c370e97fSmpi void 667c370e97fSmpi nd6_invalidate(struct rtentry *rt) 668c370e97fSmpi { 669c370e97fSmpi struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 670c370e97fSmpi 671c370e97fSmpi m_freem(ln->ln_hold); 672c370e97fSmpi ln->ln_hold = NULL; 673c370e97fSmpi ln->ln_state = ND6_LLINFO_INCOMPLETE; 674c370e97fSmpi ln->ln_asked = 0; 675c370e97fSmpi } 676c370e97fSmpi 677287546eaSitojun /* 678287546eaSitojun * Free an nd6 llinfo entry. 679d8a7e3a7Sitojun * Since the function would cause significant changes in the kernel, DO NOT 680d8a7e3a7Sitojun * make it global, unless you have a strong reason for the change, and are sure 681d8a7e3a7Sitojun * that the change is safe. 682287546eaSitojun */ 68318e33022Sbluhm void 68418e33022Sbluhm nd6_free(struct rtentry *rt) 685287546eaSitojun { 68618e33022Sbluhm struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 687c3c56496Sbluhm struct in6_addr in6 = satosin6(rt_key(rt))->sin6_addr; 688248f6870Smpi struct ifnet *ifp; 68945ffa37bSmpi 69066736630Smpi NET_ASSERT_LOCKED(); 691287546eaSitojun 692248f6870Smpi ifp = if_get(rt->rt_ifidx); 693f4f4d166Sitojun 69481d38878Smpi if (!ip6_forwarding) { 6954a2f474dSflorian if (ln->ln_router) { 696f4f4d166Sitojun /* 697f4f4d166Sitojun * rt6_flush must be called whether or not the neighbor 698f4f4d166Sitojun * is in the Default Router List. 699f4f4d166Sitojun * See a corresponding comment in nd6_na_input(). 700f4f4d166Sitojun */ 701248f6870Smpi rt6_flush(&in6, ifp); 702f4f4d166Sitojun } 703287546eaSitojun } 704287546eaSitojun 7054dfec2cfSmpi nd6_invalidate(rt); 7064dfec2cfSmpi 70729760ae1Sitojun /* 70829760ae1Sitojun * Detach the route from the routing tree and the list of neighbor 70929760ae1Sitojun * caches, and disable the route entry not to be used in already 71029760ae1Sitojun * cached routes. 71129760ae1Sitojun */ 712c370e97fSmpi if (!ISSET(rt->rt_flags, RTF_STATIC|RTF_CACHED)) 713c4cbcae8Sbluhm rtdeletemsg(rt, ifp, ifp->if_rdomain); 71429760ae1Sitojun 715248f6870Smpi if_put(ifp); 716287546eaSitojun } 717287546eaSitojun 718287546eaSitojun /* 719287546eaSitojun * Upper-layer reachability hint for Neighbor Unreachability Detection. 720287546eaSitojun * 7218b542bbeSpascoe * XXX cost-effective methods? 722287546eaSitojun */ 723287546eaSitojun void 724a7fa3e84Smpi nd6_nud_hint(struct rtentry *rt) 725287546eaSitojun { 726287546eaSitojun struct llinfo_nd6 *ln; 727a7fa3e84Smpi struct ifnet *ifp; 728287546eaSitojun 729a7fa3e84Smpi ifp = if_get(rt->rt_ifidx); 730a7fa3e84Smpi if (ifp == NULL) 731287546eaSitojun return; 732287546eaSitojun 733f6e55599Sitojun if ((rt->rt_flags & RTF_GATEWAY) != 0 || 734f6e55599Sitojun (rt->rt_flags & RTF_LLINFO) == 0 || 7359c0643cdSbluhm rt->rt_llinfo == NULL || rt->rt_gateway == NULL || 736f6e55599Sitojun rt->rt_gateway->sa_family != AF_LINK) { 737287546eaSitojun /* This is not a host route. */ 738a7fa3e84Smpi goto out; 739287546eaSitojun } 740287546eaSitojun 741287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 742804d8827Sitojun if (ln->ln_state < ND6_LLINFO_REACHABLE) 743a7fa3e84Smpi goto out; 744287546eaSitojun 745f6e55599Sitojun /* 746f6e55599Sitojun * if we get upper-layer reachability confirmation many times, 747f6e55599Sitojun * it is possible we have false information. 748f6e55599Sitojun */ 749f6e55599Sitojun ln->ln_byhint++; 750f6e55599Sitojun if (ln->ln_byhint > nd6_maxnudhint) 751a7fa3e84Smpi goto out; 752f6e55599Sitojun 753287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 754a7fa3e84Smpi if (!ND6_LLINFO_PERMANENT(ln)) 755134b71fcSdlg nd6_llinfo_settimer(ln, ND_IFINFO(ifp)->reachable); 756a7fa3e84Smpi out: 757a7fa3e84Smpi if_put(ifp); 758287546eaSitojun } 759287546eaSitojun 760287546eaSitojun void 761dcb17c31Smpi nd6_rtrequest(struct ifnet *ifp, int req, struct rtentry *rt) 762287546eaSitojun { 763287546eaSitojun struct sockaddr *gate = rt->rt_gateway; 764287546eaSitojun struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 765287546eaSitojun struct ifaddr *ifa; 766287546eaSitojun 767b71b7f0aSmpi if (ISSET(rt->rt_flags, RTF_GATEWAY|RTF_MULTICAST)) 768287546eaSitojun return; 769287546eaSitojun 770d8a7e3a7Sitojun if (nd6_need_cache(ifp) == 0 && (rt->rt_flags & RTF_HOST) == 0) { 771d8a7e3a7Sitojun /* 772d8a7e3a7Sitojun * This is probably an interface direct route for a link 773d8a7e3a7Sitojun * which does not need neighbor caches (e.g. fe80::%lo0/64). 774d8a7e3a7Sitojun * We do not need special treatment below for such a route. 775d8a7e3a7Sitojun * Moreover, the RTF_LLINFO flag which would be set below 776d8a7e3a7Sitojun * would annoy the ndp(8) command. 777d8a7e3a7Sitojun */ 778d8a7e3a7Sitojun return; 779d8a7e3a7Sitojun } 780d8a7e3a7Sitojun 781af1344beSbluhm if (req == RTM_RESOLVE && nd6_need_cache(ifp) == 0) { 782d8a7e3a7Sitojun /* 783af1344beSbluhm * For routing daemons like ospf6d we allow neighbor discovery 784af1344beSbluhm * based on the cloning route only. This allows us to sent 785af1344beSbluhm * packets directly into a network without having an address 786af1344beSbluhm * with matching prefix on the interface. If the cloning 787af1344beSbluhm * route is used for an stf interface, we would mistakenly 788af1344beSbluhm * make a neighbor cache for the host route, and would see 789af1344beSbluhm * strange neighbor solicitation for the corresponding 790af1344beSbluhm * destination. In order to avoid confusion, we check if the 791af1344beSbluhm * interface is suitable for neighbor discovery, and stop the 792d8a7e3a7Sitojun * process if not. Additionally, we remove the LLINFO flag 793d8a7e3a7Sitojun * so that ndp(8) will not try to get the neighbor information 794d8a7e3a7Sitojun * of the destination. 795d8a7e3a7Sitojun */ 796d8a7e3a7Sitojun rt->rt_flags &= ~RTF_LLINFO; 797d8a7e3a7Sitojun return; 798d8a7e3a7Sitojun } 799d8a7e3a7Sitojun 800287546eaSitojun switch (req) { 801287546eaSitojun case RTM_ADD: 80248ebf8e1Sitojun if ((rt->rt_flags & RTF_CLONING) || 8039c0643cdSbluhm ((rt->rt_flags & (RTF_LLINFO | RTF_LOCAL)) && ln == NULL)) { 8049c0643cdSbluhm if (ln != NULL) 8059631a17bSitojun nd6_llinfo_settimer(ln, 0); 806d8a7e3a7Sitojun if ((rt->rt_flags & RTF_CLONING) != 0) 807287546eaSitojun break; 808287546eaSitojun } 809f4f4d166Sitojun /* 8108b542bbeSpascoe * In IPv4 code, we try to announce new RTF_ANNOUNCE entry here. 811f4f4d166Sitojun * We don't do that here since llinfo is not ready yet. 812f4f4d166Sitojun * 813f4f4d166Sitojun * There are also couple of other things to be discussed: 814f4f4d166Sitojun * - unsolicited NA code needs improvement beforehand 815f4f4d166Sitojun * - RFC2461 says we MAY send multicast unsolicited NA 816f4f4d166Sitojun * (7.2.6 paragraph 4), however, it also says that we 817f4f4d166Sitojun * SHOULD provide a mechanism to prevent multicast NA storm. 818f4f4d166Sitojun * we don't have anything like it right now. 819841d7adbSitojun * note that the mechanism needs a mutual agreement 820f4f4d166Sitojun * between proxies, which means that we need to implement 821841d7adbSitojun * a new protocol, or a new kludge. 822841d7adbSitojun * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA. 823f4f4d166Sitojun * we need to check ip6forwarding before sending it. 824f4f4d166Sitojun * (or should we allow proxy ND configuration only for 825f4f4d166Sitojun * routers? there's no mention about proxy ND from hosts) 826f4f4d166Sitojun */ 827f4f4d166Sitojun #if 0 828f4f4d166Sitojun /* XXX it does not work */ 829287546eaSitojun if (rt->rt_flags & RTF_ANNOUNCE) 830287546eaSitojun nd6_na_output(ifp, 831c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr, 832c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr, 833287546eaSitojun ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, 834f4f4d166Sitojun 1, NULL); 835f4f4d166Sitojun #endif 836287546eaSitojun /* FALLTHROUGH */ 837287546eaSitojun case RTM_RESOLVE: 838287546eaSitojun if (gate->sa_family != AF_LINK || 839cfc71c8bSclaudio gate->sa_len < sizeof(struct sockaddr_dl)) { 84086b61919Smpi log(LOG_DEBUG, "%s: bad gateway value: %s\n", 84186b61919Smpi __func__, ifp->if_xname); 842287546eaSitojun break; 843287546eaSitojun } 844c7b7b779Sbluhm satosdl(gate)->sdl_type = ifp->if_type; 845c7b7b779Sbluhm satosdl(gate)->sdl_index = ifp->if_index; 846d374aaacSitojun if (ln != NULL) 847287546eaSitojun break; /* This happens on a route change */ 848287546eaSitojun /* 849287546eaSitojun * Case 2: This route may come from cloning, or a manual route 850287546eaSitojun * add with a LL address. 851287546eaSitojun */ 85293fbd125Sbluhm ln = pool_get(&nd6_pool, PR_NOWAIT | PR_ZERO); 853287546eaSitojun rt->rt_llinfo = (caddr_t)ln; 8549c0643cdSbluhm if (ln == NULL) { 85593fbd125Sbluhm log(LOG_DEBUG, "%s: pool get failed\n", __func__); 856287546eaSitojun break; 857287546eaSitojun } 858287546eaSitojun nd6_inuse++; 859287546eaSitojun nd6_allocated++; 860287546eaSitojun ln->ln_rt = rt; 861593f7790Smpi timeout_set_proc(&ln->ln_timer_ch, nd6_llinfo_timer, ln); 862287546eaSitojun /* this is required for "ndp" command. - shin */ 863287546eaSitojun if (req == RTM_ADD) { 864287546eaSitojun /* 865287546eaSitojun * gate should have some valid AF_LINK entry, 8663bc414e3Sdlg * and ln expire should have some lifetime 867287546eaSitojun * which is specified by ndp command. 868287546eaSitojun */ 869287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 870f6e55599Sitojun ln->ln_byhint = 0; 871287546eaSitojun } else { 872287546eaSitojun /* 873287546eaSitojun * When req == RTM_RESOLVE, rt is created and 874287546eaSitojun * initialized in rtrequest(), so rt_expire is 0. 875287546eaSitojun */ 876287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 8779631a17bSitojun nd6_llinfo_settimer(ln, 0); 878287546eaSitojun } 879287546eaSitojun rt->rt_flags |= RTF_LLINFO; 88092c821ddSbluhm TAILQ_INSERT_HEAD(&nd6_list, ln, ln_list); 881287546eaSitojun 882287546eaSitojun /* 883f3fcf2f3Smcbride * If we have too many cache entries, initiate immediate 884f3fcf2f3Smcbride * purging for some "less recently used" entries. Note that 885f3fcf2f3Smcbride * we cannot directly call nd6_free() here because it would 886f3fcf2f3Smcbride * cause re-entering rtable related routines triggering an LOR 887f3fcf2f3Smcbride * problem for FreeBSD. 888f3fcf2f3Smcbride */ 889f3fcf2f3Smcbride if (ip6_neighborgcthresh >= 0 && 890f3fcf2f3Smcbride nd6_inuse >= ip6_neighborgcthresh) { 891f3fcf2f3Smcbride int i; 892f3fcf2f3Smcbride 89392c821ddSbluhm for (i = 0; i < 10; i++) { 89492c821ddSbluhm struct llinfo_nd6 *ln_end; 89592c821ddSbluhm 89692c821ddSbluhm ln_end = TAILQ_LAST(&nd6_list, llinfo_nd6_head); 89792c821ddSbluhm if (ln_end == ln) 89892c821ddSbluhm break; 899f3fcf2f3Smcbride 900f3fcf2f3Smcbride /* Move this entry to the head */ 90192c821ddSbluhm TAILQ_REMOVE(&nd6_list, ln_end, ln_list); 90292c821ddSbluhm TAILQ_INSERT_HEAD(&nd6_list, ln_end, ln_list); 903f3fcf2f3Smcbride 904f3fcf2f3Smcbride if (ND6_LLINFO_PERMANENT(ln_end)) 905f3fcf2f3Smcbride continue; 906f3fcf2f3Smcbride 907f3fcf2f3Smcbride if (ln_end->ln_state > ND6_LLINFO_INCOMPLETE) 908f3fcf2f3Smcbride ln_end->ln_state = ND6_LLINFO_STALE; 909f3fcf2f3Smcbride else 910f3fcf2f3Smcbride ln_end->ln_state = ND6_LLINFO_PURGE; 911f3fcf2f3Smcbride nd6_llinfo_settimer(ln_end, 0); 912f3fcf2f3Smcbride } 913f3fcf2f3Smcbride } 914f3fcf2f3Smcbride 915f3fcf2f3Smcbride /* 916287546eaSitojun * check if rt_key(rt) is one of my address assigned 917287546eaSitojun * to the interface. 918287546eaSitojun */ 91986b61919Smpi ifa = &in6ifa_ifpwithaddr(ifp, 920c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr)->ia_ifa; 921287546eaSitojun if (ifa) { 9229631a17bSitojun nd6_llinfo_settimer(ln, -1); 923287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 924f6e55599Sitojun ln->ln_byhint = 0; 925fac399ceSmpi KASSERT(ifa == rt->rt_ifa); 926f4f4d166Sitojun } else if (rt->rt_flags & RTF_ANNOUNCE) { 9279631a17bSitojun nd6_llinfo_settimer(ln, -1); 928f4f4d166Sitojun ln->ln_state = ND6_LLINFO_REACHABLE; 929f6e55599Sitojun ln->ln_byhint = 0; 930f4f4d166Sitojun 931f4f4d166Sitojun /* join solicited node multicast for proxy ND */ 932f4f4d166Sitojun if (ifp->if_flags & IFF_MULTICAST) { 933f4f4d166Sitojun struct in6_addr llsol; 934f4f4d166Sitojun int error; 935f4f4d166Sitojun 936c3c56496Sbluhm llsol = satosin6(rt_key(rt))->sin6_addr; 937f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 938f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 939f4f4d166Sitojun llsol.s6_addr32[1] = 0; 940f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 941f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 942f4f4d166Sitojun 943d8a7e3a7Sitojun if (in6_addmulti(&llsol, ifp, &error)) { 944bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 945d8a7e3a7Sitojun nd6log((LOG_ERR, "%s: failed to join " 946d8a7e3a7Sitojun "%s (errno=%d)\n", ifp->if_xname, 947bbcf0337Smpi inet_ntop(AF_INET6, &llsol, 948bbcf0337Smpi addr, sizeof(addr)), 949bbcf0337Smpi error)); 950d8a7e3a7Sitojun } 951f4f4d166Sitojun } 952287546eaSitojun } 953287546eaSitojun break; 954287546eaSitojun 955287546eaSitojun case RTM_DELETE: 9569c0643cdSbluhm if (ln == NULL) 957287546eaSitojun break; 958f4f4d166Sitojun /* leave from solicited node multicast for proxy ND */ 959f4f4d166Sitojun if ((rt->rt_flags & RTF_ANNOUNCE) != 0 && 960f4f4d166Sitojun (ifp->if_flags & IFF_MULTICAST) != 0) { 961f4f4d166Sitojun struct in6_addr llsol; 962f4f4d166Sitojun struct in6_multi *in6m; 963f4f4d166Sitojun 964c3c56496Sbluhm llsol = satosin6(rt_key(rt))->sin6_addr; 965f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 966f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 967f4f4d166Sitojun llsol.s6_addr32[1] = 0; 968f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 969f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 970f4f4d166Sitojun 971f4f4d166Sitojun IN6_LOOKUP_MULTI(llsol, ifp, in6m); 972f4f4d166Sitojun if (in6m) 973f4f4d166Sitojun in6_delmulti(in6m); 974f4f4d166Sitojun } 975287546eaSitojun nd6_inuse--; 97692c821ddSbluhm TAILQ_REMOVE(&nd6_list, ln, ln_list); 9779631a17bSitojun nd6_llinfo_settimer(ln, -1); 9789c0643cdSbluhm rt->rt_llinfo = NULL; 979287546eaSitojun rt->rt_flags &= ~RTF_LLINFO; 980287546eaSitojun m_freem(ln->ln_hold); 98193fbd125Sbluhm pool_put(&nd6_pool, ln); 982c370e97fSmpi break; 983c370e97fSmpi 984c370e97fSmpi case RTM_INVALIDATE: 985c370e97fSmpi nd6_invalidate(rt); 986c370e97fSmpi break; 987287546eaSitojun } 988287546eaSitojun } 989287546eaSitojun 990287546eaSitojun int 991ee37ea65Smcbride nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp) 992287546eaSitojun { 993287546eaSitojun struct in6_ndireq *ndi = (struct in6_ndireq *)data; 994287546eaSitojun struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data; 995287546eaSitojun struct rtentry *rt; 996ee3c93eeSbluhm int error = 0; 99722e88dadSmpi 99866736630Smpi NET_ASSERT_LOCKED(); 999287546eaSitojun 1000287546eaSitojun switch (cmd) { 1001d6b9e9b9Sitojun case SIOCGIFINFO_IN6: 1002d6b9e9b9Sitojun ndi->ndi = *ND_IFINFO(ifp); 100302dac871Sderaadt memset(&ndi->ndi.randomseed0, 0, sizeof ndi->ndi.randomseed0); 100402dac871Sderaadt memset(&ndi->ndi.randomseed1, 0, sizeof ndi->ndi.randomseed1); 100502dac871Sderaadt memset(&ndi->ndi.randomid, 0, sizeof ndi->ndi.randomid); 1006287546eaSitojun break; 1007d374aaacSitojun case SIOCSIFINFO_FLAGS: 1008d6b9e9b9Sitojun ND_IFINFO(ifp)->flags = ndi->ndi.flags; 1009d374aaacSitojun break; 1010f4f4d166Sitojun case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */ 1011d8a7e3a7Sitojun /* sync kernel routing table with the default router list */ 10124a2f474dSflorian error = ENOTSUP; 1013287546eaSitojun break; 1014287546eaSitojun case SIOCSPFXFLUSH_IN6: 1015287546eaSitojun { 1016287546eaSitojun /* flush all the prefix advertised by routers */ 10174a2f474dSflorian error = ENOTSUP; 1018287546eaSitojun break; 1019287546eaSitojun } 1020287546eaSitojun case SIOCSRTRFLUSH_IN6: 1021287546eaSitojun { 1022287546eaSitojun /* flush all the default routers */ 10234a2f474dSflorian error = ENOTSUP; 1024287546eaSitojun break; 1025287546eaSitojun } 1026287546eaSitojun case SIOCGNBRINFO_IN6: 1027287546eaSitojun { 1028287546eaSitojun struct llinfo_nd6 *ln; 1029287546eaSitojun struct in6_addr nb_addr = nbi->addr; /* make local for safety */ 1030f303499dSdlg time_t expire; 1031287546eaSitojun 1032287546eaSitojun /* 1033287546eaSitojun * XXX: KAME specific hack for scoped addresses 1034287546eaSitojun * XXXX: for other scopes than link-local? 1035287546eaSitojun */ 1036287546eaSitojun if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) || 1037287546eaSitojun IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) { 1038287546eaSitojun u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2]; 1039287546eaSitojun 1040287546eaSitojun if (*idp == 0) 1041287546eaSitojun *idp = htons(ifp->if_index); 1042287546eaSitojun } 1043287546eaSitojun 104416119bbfSmpi rt = nd6_lookup(&nb_addr, 0, ifp, ifp->if_rdomain); 104516119bbfSmpi if (rt == NULL || 1046d8a7e3a7Sitojun (ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) { 1047287546eaSitojun error = EINVAL; 104816119bbfSmpi rtfree(rt); 1049287546eaSitojun break; 1050287546eaSitojun } 10513bc414e3Sdlg expire = ln->ln_rt->rt_expire; 1052f303499dSdlg if (expire != 0) { 1053f303499dSdlg expire -= time_uptime; 1054f303499dSdlg expire += time_second; 1055f303499dSdlg } 1056f303499dSdlg 1057287546eaSitojun nbi->state = ln->ln_state; 1058287546eaSitojun nbi->asked = ln->ln_asked; 1059287546eaSitojun nbi->isrouter = ln->ln_router; 1060f303499dSdlg nbi->expire = expire; 106116119bbfSmpi rtfree(rt); 1062287546eaSitojun 1063287546eaSitojun break; 1064287546eaSitojun } 1065287546eaSitojun } 1066287546eaSitojun return (error); 1067287546eaSitojun } 1068287546eaSitojun 1069287546eaSitojun /* 1070287546eaSitojun * Create neighbor cache entry and cache link-layer address, 1071287546eaSitojun * on reception of inbound ND6 packets. (RS/RA/NS/redirect) 1072ee37ea65Smcbride * 1073ee37ea65Smcbride * type - ICMP6 type 1074ee37ea65Smcbride * code - type dependent information 1075287546eaSitojun */ 1076db435b2aSmpi void 1077ee37ea65Smcbride nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr, 1078ee37ea65Smcbride int lladdrlen, int type, int code) 1079287546eaSitojun { 1080287546eaSitojun struct rtentry *rt = NULL; 1081287546eaSitojun struct llinfo_nd6 *ln = NULL; 1082287546eaSitojun int is_newentry; 1083287546eaSitojun struct sockaddr_dl *sdl = NULL; 1084287546eaSitojun int do_update; 1085287546eaSitojun int olladdr; 1086287546eaSitojun int llchange; 1087287546eaSitojun int newstate = 0; 1088287546eaSitojun 1089287546eaSitojun if (!ifp) 1090287546eaSitojun panic("ifp == NULL in nd6_cache_lladdr"); 1091287546eaSitojun if (!from) 1092287546eaSitojun panic("from == NULL in nd6_cache_lladdr"); 1093287546eaSitojun 1094287546eaSitojun /* nothing must be updated for unspecified address */ 1095287546eaSitojun if (IN6_IS_ADDR_UNSPECIFIED(from)) 1096db435b2aSmpi return; 1097287546eaSitojun 1098287546eaSitojun /* 1099287546eaSitojun * Validation about ifp->if_addrlen and lladdrlen must be done in 1100287546eaSitojun * the caller. 1101287546eaSitojun * 11028b542bbeSpascoe * XXX If the link does not have link-layer address, what should 1103287546eaSitojun * we do? (ifp->if_addrlen == 0) 1104287546eaSitojun * Spec says nothing in sections for RA, RS and NA. There's small 1105287546eaSitojun * description on it in NS section (RFC 2461 7.2.3). 1106287546eaSitojun */ 1107287546eaSitojun 1108f4d1af37Smikeb rt = nd6_lookup(from, 0, ifp, ifp->if_rdomain); 110916119bbfSmpi if (rt == NULL) { 1110287546eaSitojun #if 0 1111287546eaSitojun /* nothing must be done if there's no lladdr */ 1112287546eaSitojun if (!lladdr || !lladdrlen) 1113287546eaSitojun return NULL; 1114287546eaSitojun #endif 1115287546eaSitojun 11165148b194Smpi rt = nd6_lookup(from, 1, ifp, ifp->if_rdomain); 1117287546eaSitojun is_newentry = 1; 11180a2c5741Sitojun } else { 11190a2c5741Sitojun /* do nothing if static ndp is set */ 112016119bbfSmpi if (rt->rt_flags & RTF_STATIC) { 112116119bbfSmpi rtfree(rt); 1122db435b2aSmpi return; 112316119bbfSmpi } 1124287546eaSitojun is_newentry = 0; 11250a2c5741Sitojun } 1126287546eaSitojun 1127287546eaSitojun if (!rt) 1128db435b2aSmpi return; 1129287546eaSitojun if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) { 1130287546eaSitojun fail: 113118e33022Sbluhm nd6_free(rt); 113216119bbfSmpi rtfree(rt); 1133db435b2aSmpi return; 1134287546eaSitojun } 1135287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 11369c0643cdSbluhm if (ln == NULL) 1137287546eaSitojun goto fail; 11389c0643cdSbluhm if (rt->rt_gateway == NULL) 1139287546eaSitojun goto fail; 1140287546eaSitojun if (rt->rt_gateway->sa_family != AF_LINK) 1141287546eaSitojun goto fail; 1142c7b7b779Sbluhm sdl = satosdl(rt->rt_gateway); 1143287546eaSitojun 1144287546eaSitojun olladdr = (sdl->sdl_alen) ? 1 : 0; 1145287546eaSitojun if (olladdr && lladdr) { 1146287546eaSitojun if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 1147287546eaSitojun llchange = 1; 1148287546eaSitojun else 1149287546eaSitojun llchange = 0; 1150287546eaSitojun } else 1151287546eaSitojun llchange = 0; 1152287546eaSitojun 1153287546eaSitojun /* 1154287546eaSitojun * newentry olladdr lladdr llchange (*=record) 1155287546eaSitojun * 0 n n -- (1) 1156287546eaSitojun * 0 y n -- (2) 1157287546eaSitojun * 0 n y -- (3) * STALE 1158287546eaSitojun * 0 y y n (4) * 1159287546eaSitojun * 0 y y y (5) * STALE 1160287546eaSitojun * 1 -- n -- (6) NOSTATE(= PASSIVE) 1161287546eaSitojun * 1 -- y -- (7) * STALE 1162287546eaSitojun */ 1163287546eaSitojun 1164c8a7c9e3Sbluhm if (llchange) { 1165bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 1166c8a7c9e3Sbluhm log(LOG_INFO, "ndp info overwritten for %s by %s on %s\n", 1167bbcf0337Smpi inet_ntop(AF_INET6, from, addr, sizeof(addr)), 1168bbcf0337Smpi ether_sprintf(lladdr), ifp->if_xname); 1169c8a7c9e3Sbluhm } 1170287546eaSitojun if (lladdr) { /* (3-5) and (7) */ 1171287546eaSitojun /* 1172287546eaSitojun * Record source link-layer address 1173287546eaSitojun * XXX is it dependent to ifp->if_type? 1174287546eaSitojun */ 1175287546eaSitojun sdl->sdl_alen = ifp->if_addrlen; 1176287546eaSitojun bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 1177287546eaSitojun } 1178287546eaSitojun 1179287546eaSitojun if (!is_newentry) { 1180d8a7e3a7Sitojun if ((!olladdr && lladdr) || /* (3) */ 1181d8a7e3a7Sitojun (olladdr && lladdr && llchange)) { /* (5) */ 1182287546eaSitojun do_update = 1; 1183287546eaSitojun newstate = ND6_LLINFO_STALE; 1184287546eaSitojun } else /* (1-2,4) */ 1185287546eaSitojun do_update = 0; 1186287546eaSitojun } else { 1187287546eaSitojun do_update = 1; 1188287546eaSitojun if (!lladdr) /* (6) */ 1189287546eaSitojun newstate = ND6_LLINFO_NOSTATE; 1190287546eaSitojun else /* (7) */ 1191287546eaSitojun newstate = ND6_LLINFO_STALE; 1192287546eaSitojun } 1193287546eaSitojun 1194287546eaSitojun if (do_update) { 1195287546eaSitojun /* 1196287546eaSitojun * Update the state of the neighbor cache. 1197287546eaSitojun */ 1198287546eaSitojun ln->ln_state = newstate; 1199287546eaSitojun 1200287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 12018a7bb304Sitojun /* 120253b39a0bSmpi * Since nd6_resolve() in ifp->if_output() will cause 12038b542bbeSpascoe * state transition to DELAY and reset the timer, 12048a7bb304Sitojun * we must set the timer now, although it is actually 12058a7bb304Sitojun * meaningless. 12068a7bb304Sitojun */ 1207134b71fcSdlg nd6_llinfo_settimer(ln, nd6_gctimer); 12088a7bb304Sitojun 1209287546eaSitojun if (ln->ln_hold) { 1210e212adedSkrw struct mbuf *n = ln->ln_hold; 1211e212adedSkrw ln->ln_hold = NULL; 12126afad192Sitojun /* 12136afad192Sitojun * we assume ifp is not a p2p here, so just 12146afad192Sitojun * set the 2nd argument as the 1st one. 12156afad192Sitojun */ 121653b39a0bSmpi ifp->if_output(ifp, n, rt_key(rt), rt); 1217e212adedSkrw if (ln->ln_hold == n) { 1218e212adedSkrw /* n is back in ln_hold. Discard. */ 1219e212adedSkrw m_freem(ln->ln_hold); 12208a7bb304Sitojun ln->ln_hold = NULL; 1221287546eaSitojun } 1222e212adedSkrw } 1223287546eaSitojun } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 1224287546eaSitojun /* probe right away */ 12259631a17bSitojun nd6_llinfo_settimer((void *)ln, 0); 1226287546eaSitojun } 1227287546eaSitojun } 1228287546eaSitojun 1229287546eaSitojun /* 1230287546eaSitojun * ICMP6 type dependent behavior. 1231287546eaSitojun * 1232287546eaSitojun * NS: clear IsRouter if new entry 1233287546eaSitojun * RS: clear IsRouter 1234287546eaSitojun * RA: set IsRouter if there's lladdr 1235287546eaSitojun * redir: clear IsRouter if new entry 1236287546eaSitojun * 1237287546eaSitojun * RA case, (1): 1238287546eaSitojun * The spec says that we must set IsRouter in the following cases: 1239287546eaSitojun * - If lladdr exist, set IsRouter. This means (1-5). 1240287546eaSitojun * - If it is old entry (!newentry), set IsRouter. This means (7). 1241287546eaSitojun * So, based on the spec, in (1-5) and (7) cases we must set IsRouter. 12428b542bbeSpascoe * A question arises for (1) case. (1) case has no lladdr in the 1243287546eaSitojun * neighbor cache, this is similar to (6). 1244287546eaSitojun * This case is rare but we figured that we MUST NOT set IsRouter. 1245287546eaSitojun * 1246287546eaSitojun * newentry olladdr lladdr llchange NS RS RA redir 1247287546eaSitojun * D R 1248287546eaSitojun * 0 n n -- (1) c ? s 1249287546eaSitojun * 0 y n -- (2) c s s 1250287546eaSitojun * 0 n y -- (3) c s s 1251287546eaSitojun * 0 y y n (4) c s s 1252287546eaSitojun * 0 y y y (5) c s s 1253287546eaSitojun * 1 -- n -- (6) c c c s 1254287546eaSitojun * 1 -- y -- (7) c c s c s 1255287546eaSitojun * 1256287546eaSitojun * (c=clear s=set) 1257287546eaSitojun */ 1258287546eaSitojun switch (type & 0xff) { 1259287546eaSitojun case ND_NEIGHBOR_SOLICIT: 1260287546eaSitojun /* 1261287546eaSitojun * New entry must have is_router flag cleared. 1262287546eaSitojun */ 1263287546eaSitojun if (is_newentry) /* (6-7) */ 1264287546eaSitojun ln->ln_router = 0; 1265287546eaSitojun break; 1266287546eaSitojun case ND_REDIRECT: 1267287546eaSitojun /* 1268287546eaSitojun * If the icmp is a redirect to a better router, always set the 1269287546eaSitojun * is_router flag. Otherwise, if the entry is newly created, 1270287546eaSitojun * clear the flag. [RFC 2461, sec 8.3] 1271287546eaSitojun */ 1272287546eaSitojun if (code == ND_REDIRECT_ROUTER) 1273287546eaSitojun ln->ln_router = 1; 1274287546eaSitojun else if (is_newentry) /* (6-7) */ 1275287546eaSitojun ln->ln_router = 0; 1276287546eaSitojun break; 1277287546eaSitojun case ND_ROUTER_SOLICIT: 1278287546eaSitojun /* 1279287546eaSitojun * is_router flag must always be cleared. 1280287546eaSitojun */ 1281287546eaSitojun ln->ln_router = 0; 1282287546eaSitojun break; 1283287546eaSitojun case ND_ROUTER_ADVERT: 1284287546eaSitojun /* 1285287546eaSitojun * Mark an entry with lladdr as a router. 1286287546eaSitojun */ 1287d8a7e3a7Sitojun if ((!is_newentry && (olladdr || lladdr)) || /* (2-5) */ 1288d8a7e3a7Sitojun (is_newentry && lladdr)) { /* (7) */ 1289287546eaSitojun ln->ln_router = 1; 1290287546eaSitojun } 1291287546eaSitojun break; 1292287546eaSitojun } 1293287546eaSitojun 129416119bbfSmpi rtfree(rt); 1295287546eaSitojun } 1296287546eaSitojun 1297a0aa363cSjsing void 1298ee37ea65Smcbride nd6_slowtimo(void *ignored_arg) 1299287546eaSitojun { 1300b3c1e4c1Sitojun struct nd_ifinfo *nd6if; 1301d6b9e9b9Sitojun struct ifnet *ifp; 130222e88dadSmpi int s; 130322e88dadSmpi 130422e88dadSmpi NET_LOCK(s); 1305287546eaSitojun 130629e86e5eSblambert timeout_add_sec(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL); 130722e88dadSmpi 1308d814b14cSbluhm TAILQ_FOREACH(ifp, &ifnet, if_list) { 1309d6b9e9b9Sitojun nd6if = ND_IFINFO(ifp); 1310287546eaSitojun if (nd6if->basereachable && /* already initialized */ 1311287546eaSitojun (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) { 1312287546eaSitojun /* 1313287546eaSitojun * Since reachable time rarely changes by router 1314287546eaSitojun * advertisements, we SHOULD insure that a new random 1315287546eaSitojun * value gets recomputed at least once every few hours. 1316287546eaSitojun * (RFC 2461, 6.3.4) 1317287546eaSitojun */ 1318287546eaSitojun nd6if->recalctm = nd6_recalc_reachtm_interval; 1319287546eaSitojun nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable); 1320287546eaSitojun } 1321287546eaSitojun } 132222e88dadSmpi NET_UNLOCK(s); 1323287546eaSitojun } 1324287546eaSitojun 1325287546eaSitojun int 13265d32b3a0Smpi nd6_resolve(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m, 13275d32b3a0Smpi struct sockaddr *dst, u_char *desten) 13285d32b3a0Smpi { 13295d32b3a0Smpi struct sockaddr_dl *sdl; 13305d32b3a0Smpi struct rtentry *rt; 1331287546eaSitojun struct llinfo_nd6 *ln = NULL; 1332287546eaSitojun 13335d32b3a0Smpi if (m->m_flags & M_MCAST) { 13345d32b3a0Smpi ETHER_MAP_IPV6_MULTICAST(&satosin6(dst)->sin6_addr, desten); 13355d32b3a0Smpi return (0); 13365d32b3a0Smpi } 13375b3a2895Ssthen 1338c370e97fSmpi rt = rt_getll(rt0); 1339c370e97fSmpi 1340c370e97fSmpi if (ISSET(rt->rt_flags, RTF_REJECT) && 1341c370e97fSmpi (rt->rt_expire == 0 || time_uptime < rt->rt_expire)) { 13428c023157Smpi m_freem(m); 1343c370e97fSmpi return (rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 1344287546eaSitojun } 1345cfb6b8dfSitojun 1346287546eaSitojun /* 1347287546eaSitojun * Address resolution or Neighbor Unreachability Detection 1348287546eaSitojun * for the next hop. 1349287546eaSitojun * At this point, the destination of the packet must be a unicast 1350287546eaSitojun * or an anycast address(i.e. not a multicast). 1351287546eaSitojun */ 13525da3fb44Smpi if (!ISSET(rt->rt_flags, RTF_LLINFO)) { 1353bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 13545da3fb44Smpi log(LOG_DEBUG, "%s: %s: route contains no ND information\n", 13555da3fb44Smpi __func__, inet_ntop(AF_INET6, 13565da3fb44Smpi &satosin6(rt_key(rt))->sin6_addr, addr, sizeof(addr))); 135716119bbfSmpi m_freem(m); 13585da3fb44Smpi return (EINVAL); 1359287546eaSitojun } 1360287546eaSitojun 13615d32b3a0Smpi if (rt->rt_gateway->sa_family != AF_LINK) { 13625d32b3a0Smpi printf("%s: something odd happens\n", __func__); 13635d32b3a0Smpi m_freem(m); 13645d32b3a0Smpi return (EINVAL); 13655d32b3a0Smpi } 13665d32b3a0Smpi 13675da3fb44Smpi ln = (struct llinfo_nd6 *)rt->rt_llinfo; 13685da3fb44Smpi KASSERT(ln != NULL); 1369cfb6b8dfSitojun 1370f3fcf2f3Smcbride /* 1371f3fcf2f3Smcbride * Move this entry to the head of the queue so that it is less likely 1372f3fcf2f3Smcbride * for this entry to be a target of forced garbage collection (see 1373f3fcf2f3Smcbride * nd6_rtrequest()). 1374f3fcf2f3Smcbride */ 137592c821ddSbluhm TAILQ_REMOVE(&nd6_list, ln, ln_list); 137692c821ddSbluhm TAILQ_INSERT_HEAD(&nd6_list, ln, ln_list); 1377f3fcf2f3Smcbride 1378287546eaSitojun /* 1379287546eaSitojun * The first time we send a packet to a neighbor whose entry is 1380287546eaSitojun * STALE, we have to change the state to DELAY and a sets a timer to 1381287546eaSitojun * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do 1382287546eaSitojun * neighbor unreachability detection on expiration. 1383287546eaSitojun * (RFC 2461 7.3.3) 1384287546eaSitojun */ 1385287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 1386287546eaSitojun ln->ln_asked = 0; 1387287546eaSitojun ln->ln_state = ND6_LLINFO_DELAY; 1388134b71fcSdlg nd6_llinfo_settimer(ln, nd6_delay); 1389287546eaSitojun } 1390287546eaSitojun 1391287546eaSitojun /* 1392287546eaSitojun * If the neighbor cache entry has a state other than INCOMPLETE 139334deef1eSitojun * (i.e. its link-layer address is already resolved), just 1394287546eaSitojun * send the packet. 1395287546eaSitojun */ 13965d32b3a0Smpi if (ln->ln_state > ND6_LLINFO_INCOMPLETE) { 13975d32b3a0Smpi sdl = satosdl(rt->rt_gateway); 13985d32b3a0Smpi if (sdl->sdl_alen != ETHER_ADDR_LEN) { 13995d32b3a0Smpi char addr[INET6_ADDRSTRLEN]; 14005d32b3a0Smpi log(LOG_DEBUG, "%s: %s: incorrect nd6 information\n", 14015d32b3a0Smpi __func__, 14025d32b3a0Smpi inet_ntop(AF_INET6, &satosin6(dst)->sin6_addr, 14035d32b3a0Smpi addr, sizeof(addr))); 14045d32b3a0Smpi m_freem(m); 14055d32b3a0Smpi return (EINVAL); 14065d32b3a0Smpi } 14075d32b3a0Smpi 14085d32b3a0Smpi bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 14095d32b3a0Smpi return (0); 14105d32b3a0Smpi } 1411287546eaSitojun 1412287546eaSitojun /* 1413287546eaSitojun * There is a neighbor cache entry, but no ethernet address 1414287546eaSitojun * response yet. Replace the held mbuf (if any) with this 1415287546eaSitojun * latest one. 1416287546eaSitojun */ 1417efcf292bSitojun if (ln->ln_state == ND6_LLINFO_NOSTATE) 1418287546eaSitojun ln->ln_state = ND6_LLINFO_INCOMPLETE; 1419287546eaSitojun m_freem(ln->ln_hold); 1420287546eaSitojun ln->ln_hold = m; 14215d32b3a0Smpi 142276843262Sitojun /* 142376843262Sitojun * If there has been no NS for the neighbor after entering the 142476843262Sitojun * INCOMPLETE state, send the first solicitation. 142576843262Sitojun */ 14269631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln) && ln->ln_asked == 0) { 1427287546eaSitojun ln->ln_asked++; 1428134b71fcSdlg nd6_llinfo_settimer(ln, ND_IFINFO(ifp)->retrans / 1000); 14295d32b3a0Smpi nd6_ns_output(ifp, NULL, &satosin6(dst)->sin6_addr, ln, 0); 1430287546eaSitojun } 14315d32b3a0Smpi return (EAGAIN); 1432287546eaSitojun } 1433287546eaSitojun 1434287546eaSitojun int 1435ee37ea65Smcbride nd6_need_cache(struct ifnet *ifp) 1436d8a7e3a7Sitojun { 1437d8a7e3a7Sitojun /* 1438d8a7e3a7Sitojun * RFC2893 says: 1439d8a7e3a7Sitojun * - unidirectional tunnels needs no ND 1440d8a7e3a7Sitojun */ 1441d8a7e3a7Sitojun switch (ifp->if_type) { 1442d8a7e3a7Sitojun case IFT_ETHER: 1443d8a7e3a7Sitojun case IFT_IEEE80211: 1444f4433d56Shenning case IFT_CARP: 1445d8a7e3a7Sitojun return (1); 1446d8a7e3a7Sitojun default: 1447d8a7e3a7Sitojun return (0); 1448d8a7e3a7Sitojun } 1449d8a7e3a7Sitojun } 1450