1*7ffb277fSbluhm /* $OpenBSD: nd6.c,v 1.167 2015/10/30 09:39:42 bluhm Exp $ */ 2d8a7e3a7Sitojun /* $KAME: nd6.c,v 1.280 2002/06/08 19:52:07 itojun Exp $ */ 3287546eaSitojun 4287546eaSitojun /* 5287546eaSitojun * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6287546eaSitojun * All rights reserved. 7287546eaSitojun * 8287546eaSitojun * Redistribution and use in source and binary forms, with or without 9287546eaSitojun * modification, are permitted provided that the following conditions 10287546eaSitojun * are met: 11287546eaSitojun * 1. Redistributions of source code must retain the above copyright 12287546eaSitojun * notice, this list of conditions and the following disclaimer. 13287546eaSitojun * 2. Redistributions in binary form must reproduce the above copyright 14287546eaSitojun * notice, this list of conditions and the following disclaimer in the 15287546eaSitojun * documentation and/or other materials provided with the distribution. 16287546eaSitojun * 3. Neither the name of the project nor the names of its contributors 17287546eaSitojun * may be used to endorse or promote products derived from this software 18287546eaSitojun * without specific prior written permission. 19287546eaSitojun * 20287546eaSitojun * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21287546eaSitojun * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22287546eaSitojun * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23287546eaSitojun * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24287546eaSitojun * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25287546eaSitojun * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26287546eaSitojun * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27287546eaSitojun * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28287546eaSitojun * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29287546eaSitojun * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30287546eaSitojun * SUCH DAMAGE. 31287546eaSitojun */ 32287546eaSitojun 33287546eaSitojun #include <sys/param.h> 34287546eaSitojun #include <sys/systm.h> 35b3c1e4c1Sitojun #include <sys/timeout.h> 36287546eaSitojun #include <sys/malloc.h> 37287546eaSitojun #include <sys/mbuf.h> 38287546eaSitojun #include <sys/socket.h> 39287546eaSitojun #include <sys/sockio.h> 40287546eaSitojun #include <sys/time.h> 41287546eaSitojun #include <sys/kernel.h> 42f4f4d166Sitojun #include <sys/protosw.h> 43287546eaSitojun #include <sys/errno.h> 44287546eaSitojun #include <sys/ioctl.h> 45287546eaSitojun #include <sys/syslog.h> 46287546eaSitojun #include <sys/queue.h> 47a09574ebSkettenis #include <sys/task.h> 48287546eaSitojun 49287546eaSitojun #include <net/if.h> 50287546eaSitojun #include <net/if_dl.h> 51287546eaSitojun #include <net/if_types.h> 52287546eaSitojun #include <net/route.h> 53287546eaSitojun 54287546eaSitojun #include <netinet/in.h> 55287546eaSitojun #include <netinet/if_ether.h> 56cb39d30aSangelos #include <netinet/ip_ipsp.h> 5758aa7d74Sangelos 58287546eaSitojun #include <netinet6/in6_var.h> 59fa86ee14Sitojun #include <netinet/ip6.h> 60287546eaSitojun #include <netinet6/ip6_var.h> 61287546eaSitojun #include <netinet6/nd6.h> 62fa86ee14Sitojun #include <netinet/icmp6.h> 63287546eaSitojun 64287546eaSitojun #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */ 65287546eaSitojun #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */ 66287546eaSitojun 67287546eaSitojun /* timer values */ 68287546eaSitojun int nd6_prune = 1; /* walk list every 1 seconds */ 69287546eaSitojun int nd6_delay = 5; /* delay first probe time 5 second */ 70287546eaSitojun int nd6_umaxtries = 3; /* maximum unicast query */ 71287546eaSitojun int nd6_mmaxtries = 3; /* maximum multicast query */ 72be4e9e12Sitojun int nd6_gctimer = (60 * 60 * 24); /* 1 day: garbage collection timer */ 73287546eaSitojun 74287546eaSitojun /* preventing too many loops in ND option parsing */ 75287546eaSitojun int nd6_maxndopt = 10; /* max # of ND options allowed */ 76287546eaSitojun 77f6e55599Sitojun int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */ 78f6e55599Sitojun 79b79da24aSitojun #ifdef ND6_DEBUG 80b79da24aSitojun int nd6_debug = 1; 81b79da24aSitojun #else 82b79da24aSitojun int nd6_debug = 0; 83b79da24aSitojun #endif 84b79da24aSitojun 85287546eaSitojun static int nd6_inuse, nd6_allocated; 86287546eaSitojun 87287546eaSitojun struct llinfo_nd6 llinfo_nd6 = {&llinfo_nd6, &llinfo_nd6}; 88f4f4d166Sitojun struct nd_drhead nd_defrouter; 89287546eaSitojun struct nd_prhead nd_prefix = { 0 }; 90287546eaSitojun 91287546eaSitojun int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL; 92287546eaSitojun 93a0aa363cSjsing void nd6_slowtimo(void *); 94a0aa363cSjsing struct llinfo_nd6 *nd6_free(struct rtentry *, int); 95a0aa363cSjsing void nd6_llinfo_timer(void *); 96287546eaSitojun 97b3c1e4c1Sitojun struct timeout nd6_slowtimo_ch; 98b3c1e4c1Sitojun struct timeout nd6_timer_ch; 99a09574ebSkettenis struct task nd6_timer_task; 100e4195480Sdlg void nd6_timer_work(void *); 101b3c1e4c1Sitojun 102a0aa363cSjsing int fill_drlist(void *, size_t *, size_t); 103a0aa363cSjsing int fill_prlist(void *, size_t *, size_t); 104d8a7e3a7Sitojun 105f3fcf2f3Smcbride #define LN_DEQUEUE(ln) do { \ 106f3fcf2f3Smcbride (ln)->ln_next->ln_prev = (ln)->ln_prev; \ 107f3fcf2f3Smcbride (ln)->ln_prev->ln_next = (ln)->ln_next; \ 108f3fcf2f3Smcbride } while (0) 109f3fcf2f3Smcbride #define LN_INSERTHEAD(ln) do { \ 110f3fcf2f3Smcbride (ln)->ln_next = llinfo_nd6.ln_next; \ 111f3fcf2f3Smcbride llinfo_nd6.ln_next = (ln); \ 112f3fcf2f3Smcbride (ln)->ln_prev = &llinfo_nd6; \ 113f3fcf2f3Smcbride (ln)->ln_next->ln_prev = (ln); \ 114f3fcf2f3Smcbride } while (0) 115f3fcf2f3Smcbride 116287546eaSitojun void 117a0aa363cSjsing nd6_init(void) 118287546eaSitojun { 119287546eaSitojun static int nd6_init_done = 0; 120287546eaSitojun 121287546eaSitojun if (nd6_init_done) { 12235075f95Smpi log(LOG_NOTICE, "%s called more than once\n", __func__); 123287546eaSitojun return; 124287546eaSitojun } 125287546eaSitojun 126f4f4d166Sitojun /* initialization of the default router list */ 127f4f4d166Sitojun TAILQ_INIT(&nd_defrouter); 128f4f4d166Sitojun 129e4195480Sdlg task_set(&nd6_timer_task, nd6_timer_work, NULL); 130a09574ebSkettenis 131287546eaSitojun nd6_init_done = 1; 132287546eaSitojun 133287546eaSitojun /* start timer */ 134b3c1e4c1Sitojun timeout_set(&nd6_slowtimo_ch, nd6_slowtimo, NULL); 13529e86e5eSblambert timeout_add_sec(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL); 136110585f2Sflorian 13760968cbeSmpi nd6_rs_init(); 138287546eaSitojun } 139287546eaSitojun 140d6b9e9b9Sitojun struct nd_ifinfo * 141ee37ea65Smcbride nd6_ifattach(struct ifnet *ifp) 142287546eaSitojun { 143d6b9e9b9Sitojun struct nd_ifinfo *nd; 144287546eaSitojun 145393af863Skrw nd = malloc(sizeof(*nd), M_IP6NDP, M_WAITOK | M_ZERO); 146287546eaSitojun 147d6b9e9b9Sitojun nd->initialized = 1; 148287546eaSitojun 149d6b9e9b9Sitojun nd->basereachable = REACHABLE_TIME; 150d6b9e9b9Sitojun nd->reachable = ND_COMPUTE_RTIME(nd->basereachable); 151d6b9e9b9Sitojun nd->retrans = RETRANS_TIMER; 1522a4a63f1Shenning /* per-interface IFXF_AUTOCONF6 needs to be set too to accept RAs */ 153d8a7e3a7Sitojun nd->flags = (ND6_IFF_PERFORMNUD | ND6_IFF_ACCEPT_RTADV); 1541b5f410aSitojun 155d6b9e9b9Sitojun return nd; 156287546eaSitojun } 157287546eaSitojun 158d6b9e9b9Sitojun void 159ee37ea65Smcbride nd6_ifdetach(struct nd_ifinfo *nd) 160d6b9e9b9Sitojun { 161d374aaacSitojun 162dd168dc2Stedu free(nd, M_IP6NDP, 0); 163287546eaSitojun } 164287546eaSitojun 165287546eaSitojun void 166ee37ea65Smcbride nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts) 167287546eaSitojun { 168287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 169287546eaSitojun ndopts->nd_opts_search = (struct nd_opt_hdr *)opt; 170287546eaSitojun ndopts->nd_opts_last 171287546eaSitojun = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len); 172287546eaSitojun 173287546eaSitojun if (icmp6len == 0) { 174287546eaSitojun ndopts->nd_opts_done = 1; 175287546eaSitojun ndopts->nd_opts_search = NULL; 176287546eaSitojun } 177287546eaSitojun } 178287546eaSitojun 179287546eaSitojun /* 180287546eaSitojun * Take one ND option. 181287546eaSitojun */ 182287546eaSitojun struct nd_opt_hdr * 183ee37ea65Smcbride nd6_option(union nd_opts *ndopts) 184287546eaSitojun { 185287546eaSitojun struct nd_opt_hdr *nd_opt; 186287546eaSitojun int olen; 187287546eaSitojun 188287546eaSitojun if (!ndopts) 189bc84bce2Skrw panic("ndopts == NULL in nd6_option"); 190287546eaSitojun if (!ndopts->nd_opts_last) 191bc84bce2Skrw panic("uninitialized ndopts in nd6_option"); 192287546eaSitojun if (!ndopts->nd_opts_search) 193287546eaSitojun return NULL; 194287546eaSitojun if (ndopts->nd_opts_done) 195287546eaSitojun return NULL; 196287546eaSitojun 197287546eaSitojun nd_opt = ndopts->nd_opts_search; 198287546eaSitojun 19915bd77d2Sitojun /* make sure nd_opt_len is inside the buffer */ 20015bd77d2Sitojun if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) { 20115bd77d2Sitojun bzero(ndopts, sizeof(*ndopts)); 20215bd77d2Sitojun return NULL; 20315bd77d2Sitojun } 20415bd77d2Sitojun 205287546eaSitojun olen = nd_opt->nd_opt_len << 3; 206287546eaSitojun if (olen == 0) { 207287546eaSitojun /* 208287546eaSitojun * Message validation requires that all included 209287546eaSitojun * options have a length that is greater than zero. 210287546eaSitojun */ 211287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 212287546eaSitojun return NULL; 213287546eaSitojun } 214287546eaSitojun 215287546eaSitojun ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen); 21615bd77d2Sitojun if (ndopts->nd_opts_search > ndopts->nd_opts_last) { 21715bd77d2Sitojun /* option overruns the end of buffer, invalid */ 21815bd77d2Sitojun bzero(ndopts, sizeof(*ndopts)); 21915bd77d2Sitojun return NULL; 22015bd77d2Sitojun } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) { 22115bd77d2Sitojun /* reached the end of options chain */ 222287546eaSitojun ndopts->nd_opts_done = 1; 223287546eaSitojun ndopts->nd_opts_search = NULL; 224287546eaSitojun } 225287546eaSitojun return nd_opt; 226287546eaSitojun } 227287546eaSitojun 228287546eaSitojun /* 229287546eaSitojun * Parse multiple ND options. 230287546eaSitojun * This function is much easier to use, for ND routines that do not need 231287546eaSitojun * multiple options of the same type. 232287546eaSitojun */ 233287546eaSitojun int 234ee37ea65Smcbride nd6_options(union nd_opts *ndopts) 235287546eaSitojun { 236287546eaSitojun struct nd_opt_hdr *nd_opt; 237287546eaSitojun int i = 0; 238287546eaSitojun 239287546eaSitojun if (!ndopts) 240bc84bce2Skrw panic("ndopts == NULL in nd6_options"); 241287546eaSitojun if (!ndopts->nd_opts_last) 242bc84bce2Skrw panic("uninitialized ndopts in nd6_options"); 243287546eaSitojun if (!ndopts->nd_opts_search) 244287546eaSitojun return 0; 245287546eaSitojun 246287546eaSitojun while (1) { 247287546eaSitojun nd_opt = nd6_option(ndopts); 248287546eaSitojun if (!nd_opt && !ndopts->nd_opts_last) { 249287546eaSitojun /* 250287546eaSitojun * Message validation requires that all included 251287546eaSitojun * options have a length that is greater than zero. 252287546eaSitojun */ 253b79da24aSitojun icmp6stat.icp6s_nd_badopt++; 254287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 255287546eaSitojun return -1; 256287546eaSitojun } 257287546eaSitojun 258287546eaSitojun if (!nd_opt) 259287546eaSitojun goto skip1; 260287546eaSitojun 261287546eaSitojun switch (nd_opt->nd_opt_type) { 262287546eaSitojun case ND_OPT_SOURCE_LINKADDR: 263287546eaSitojun case ND_OPT_TARGET_LINKADDR: 264287546eaSitojun case ND_OPT_MTU: 265287546eaSitojun case ND_OPT_REDIRECTED_HEADER: 266287546eaSitojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { 26715bd77d2Sitojun nd6log((LOG_INFO, 26815bd77d2Sitojun "duplicated ND6 option found (type=%d)\n", 26915bd77d2Sitojun nd_opt->nd_opt_type)); 270287546eaSitojun /* XXX bark? */ 271287546eaSitojun } else { 272287546eaSitojun ndopts->nd_opt_array[nd_opt->nd_opt_type] 273287546eaSitojun = nd_opt; 274287546eaSitojun } 275287546eaSitojun break; 276287546eaSitojun case ND_OPT_PREFIX_INFORMATION: 277287546eaSitojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) { 278287546eaSitojun ndopts->nd_opt_array[nd_opt->nd_opt_type] 279287546eaSitojun = nd_opt; 280287546eaSitojun } 281287546eaSitojun ndopts->nd_opts_pi_end = 282287546eaSitojun (struct nd_opt_prefix_info *)nd_opt; 283287546eaSitojun break; 284287546eaSitojun default: 285287546eaSitojun /* 286287546eaSitojun * Unknown options must be silently ignored, 287e4d25771Stodd * to accommodate future extension to the protocol. 288287546eaSitojun */ 289b79da24aSitojun nd6log((LOG_DEBUG, 290287546eaSitojun "nd6_options: unsupported option %d - " 291b79da24aSitojun "option ignored\n", nd_opt->nd_opt_type)); 292287546eaSitojun } 293287546eaSitojun 294287546eaSitojun skip1: 295287546eaSitojun i++; 296287546eaSitojun if (i > nd6_maxndopt) { 297287546eaSitojun icmp6stat.icp6s_nd_toomanyopt++; 298b79da24aSitojun nd6log((LOG_INFO, "too many loop in nd opt\n")); 299287546eaSitojun break; 300287546eaSitojun } 301287546eaSitojun 302287546eaSitojun if (ndopts->nd_opts_done) 303287546eaSitojun break; 304287546eaSitojun } 305287546eaSitojun 306287546eaSitojun return 0; 307287546eaSitojun } 308287546eaSitojun 309287546eaSitojun /* 3109631a17bSitojun * ND6 timer routine to handle ND6 entries 311287546eaSitojun */ 312287546eaSitojun void 3139631a17bSitojun nd6_llinfo_settimer(struct llinfo_nd6 *ln, long tick) 3149631a17bSitojun { 3159631a17bSitojun int s; 3169631a17bSitojun 3179631a17bSitojun s = splsoftnet(); 3189631a17bSitojun 3199631a17bSitojun if (tick < 0) { 3209631a17bSitojun ln->ln_expire = 0; 3219631a17bSitojun ln->ln_ntick = 0; 3229631a17bSitojun timeout_del(&ln->ln_timer_ch); 3239631a17bSitojun } else { 3243212dc31Stholo ln->ln_expire = time_second + tick / hz; 3259631a17bSitojun if (tick > INT_MAX) { 3269631a17bSitojun ln->ln_ntick = tick - INT_MAX; 3279631a17bSitojun timeout_add(&ln->ln_timer_ch, INT_MAX); 3289631a17bSitojun } else { 3299631a17bSitojun ln->ln_ntick = 0; 3309631a17bSitojun timeout_add(&ln->ln_timer_ch, tick); 3319631a17bSitojun } 3329631a17bSitojun } 3339631a17bSitojun 3349631a17bSitojun splx(s); 3359631a17bSitojun } 3369631a17bSitojun 337a0aa363cSjsing void 3389631a17bSitojun nd6_llinfo_timer(void *arg) 339287546eaSitojun { 340287546eaSitojun int s; 341b3c1e4c1Sitojun struct llinfo_nd6 *ln; 342287546eaSitojun struct rtentry *rt; 343287546eaSitojun struct sockaddr_in6 *dst; 3449631a17bSitojun struct ifnet *ifp; 345d374aaacSitojun struct nd_ifinfo *ndi = NULL; 346287546eaSitojun 3479631a17bSitojun s = splsoftnet(); 3489631a17bSitojun 3499631a17bSitojun ln = (struct llinfo_nd6 *)arg; 3509631a17bSitojun 3519631a17bSitojun if (ln->ln_ntick > 0) { 3529631a17bSitojun if (ln->ln_ntick > INT_MAX) { 3539631a17bSitojun ln->ln_ntick -= INT_MAX; 3549631a17bSitojun nd6_llinfo_settimer(ln, INT_MAX); 3559631a17bSitojun } else { 3569631a17bSitojun ln->ln_ntick = 0; 3579631a17bSitojun nd6_llinfo_settimer(ln, ln->ln_ntick); 358287546eaSitojun } 3599631a17bSitojun splx(s); 3609631a17bSitojun return; 361287546eaSitojun } 3629631a17bSitojun 3639631a17bSitojun if ((rt = ln->ln_rt) == NULL) 3649631a17bSitojun panic("ln->ln_rt == NULL"); 36547773228Sjsg if ((ifp = if_get(rt->rt_ifidx)) == NULL) { 36647773228Sjsg splx(s); 367f5e0f62bSmpi return; 36847773228Sjsg } 369d6b9e9b9Sitojun ndi = ND_IFINFO(ifp); 370c3c56496Sbluhm dst = satosin6(rt_key(rt)); 371287546eaSitojun 372287546eaSitojun /* sanity check */ 373d374aaacSitojun if (rt->rt_llinfo && (struct llinfo_nd6 *)rt->rt_llinfo != ln) 374bc84bce2Skrw panic("rt_llinfo(%p) is not equal to ln(%p)", 375d374aaacSitojun rt->rt_llinfo, ln); 376287546eaSitojun if (!dst) 377bc84bce2Skrw panic("dst=0 in nd6_timer(ln=%p)", ln); 378287546eaSitojun 379287546eaSitojun switch (ln->ln_state) { 380287546eaSitojun case ND6_LLINFO_INCOMPLETE: 381287546eaSitojun if (ln->ln_asked < nd6_mmaxtries) { 382287546eaSitojun ln->ln_asked++; 3839631a17bSitojun nd6_llinfo_settimer(ln, (long)ndi->retrans * hz / 1000); 3849631a17bSitojun nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 385287546eaSitojun } else { 386287546eaSitojun struct mbuf *m = ln->ln_hold; 387287546eaSitojun if (m) { 3888294a4dfSitojun ln->ln_hold = NULL; 389287546eaSitojun /* 390d8a7e3a7Sitojun * Fake rcvif to make the ICMP error 391d8a7e3a7Sitojun * more helpful in diagnosing for the 392d8a7e3a7Sitojun * receiver. 393287546eaSitojun * XXX: should we consider 394287546eaSitojun * older rcvif? 395287546eaSitojun */ 39628112c65Smpi m->m_pkthdr.ph_ifidx = rt->rt_ifidx; 397d8a7e3a7Sitojun 398287546eaSitojun icmp6_error(m, ICMP6_DST_UNREACH, 399287546eaSitojun ICMP6_DST_UNREACH_ADDR, 0); 400e212adedSkrw if (ln->ln_hold == m) { 401e212adedSkrw /* m is back in ln_hold. Discard. */ 402e212adedSkrw m_freem(ln->ln_hold); 403e212adedSkrw ln->ln_hold = NULL; 404e212adedSkrw } 405287546eaSitojun } 4069631a17bSitojun (void)nd6_free(rt, 0); 4079631a17bSitojun ln = NULL; 408287546eaSitojun } 409287546eaSitojun break; 410287546eaSitojun case ND6_LLINFO_REACHABLE: 4119631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 412287546eaSitojun ln->ln_state = ND6_LLINFO_STALE; 4139631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 414be4e9e12Sitojun } 415287546eaSitojun break; 416be4e9e12Sitojun 417be4e9e12Sitojun case ND6_LLINFO_STALE: 418f3fcf2f3Smcbride case ND6_LLINFO_PURGE: 419be4e9e12Sitojun /* Garbage Collection(RFC 2461 5.3) */ 4209631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 4219631a17bSitojun (void)nd6_free(rt, 1); 4229631a17bSitojun ln = NULL; 4239631a17bSitojun } 424be4e9e12Sitojun break; 425be4e9e12Sitojun 426287546eaSitojun case ND6_LLINFO_DELAY: 427d374aaacSitojun if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) { 428d374aaacSitojun /* We need NUD */ 429287546eaSitojun ln->ln_asked = 1; 430287546eaSitojun ln->ln_state = ND6_LLINFO_PROBE; 4319631a17bSitojun nd6_llinfo_settimer(ln, (long)ndi->retrans * hz / 1000); 432d374aaacSitojun nd6_ns_output(ifp, &dst->sin6_addr, 433d8a7e3a7Sitojun &dst->sin6_addr, ln, 0); 434be4e9e12Sitojun } else { 435d374aaacSitojun ln->ln_state = ND6_LLINFO_STALE; /* XXX */ 4369631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 437be4e9e12Sitojun } 438287546eaSitojun break; 439287546eaSitojun case ND6_LLINFO_PROBE: 440287546eaSitojun if (ln->ln_asked < nd6_umaxtries) { 441287546eaSitojun ln->ln_asked++; 4429631a17bSitojun nd6_llinfo_settimer(ln, (long)ndi->retrans * hz / 1000); 443287546eaSitojun nd6_ns_output(ifp, &dst->sin6_addr, 444287546eaSitojun &dst->sin6_addr, ln, 0); 445d8a7e3a7Sitojun } else { 4469631a17bSitojun (void)nd6_free(rt, 0); 4479631a17bSitojun ln = NULL; 448d8a7e3a7Sitojun } 449287546eaSitojun break; 450287546eaSitojun } 4519631a17bSitojun 452f5e0f62bSmpi if_put(ifp); 4539631a17bSitojun splx(s); 454287546eaSitojun } 455287546eaSitojun 4569631a17bSitojun /* 4579631a17bSitojun * ND6 timer routine to expire default route list and prefix list 4589631a17bSitojun */ 4599631a17bSitojun void 460e4195480Sdlg nd6_timer_work(void *null) 4619631a17bSitojun { 4629631a17bSitojun int s; 463568012e6Sbluhm struct nd_defrouter *dr, *ndr; 464119a433cSbluhm struct nd_prefix *pr, *npr; 4659631a17bSitojun struct in6_ifaddr *ia6, *nia6; 4669631a17bSitojun 4679631a17bSitojun s = splsoftnet(); 4689631a17bSitojun timeout_set(&nd6_timer_ch, nd6_timer, NULL); 46929e86e5eSblambert timeout_add_sec(&nd6_timer_ch, nd6_prune); 4709631a17bSitojun 4710a2c5741Sitojun /* expire default router list */ 472568012e6Sbluhm TAILQ_FOREACH_SAFE(dr, &nd_defrouter, dr_entry, ndr) 473568012e6Sbluhm if (dr->expire && dr->expire < time_second) 474287546eaSitojun defrtrlist_del(dr); 475287546eaSitojun 476287546eaSitojun /* 477d8a7e3a7Sitojun * expire interface addresses. 478d8a7e3a7Sitojun * in the past the loop was inside prefix expiry processing. 4798b542bbeSpascoe * However, from a stricter spec-conformance standpoint, we should 480d8a7e3a7Sitojun * rather separate address lifetimes and prefix lifetimes. 481d8a7e3a7Sitojun */ 482a0fa8079Smpi TAILQ_FOREACH_SAFE(ia6, &in6_ifaddr, ia_list, nia6) { 483d8a7e3a7Sitojun /* check address lifetime */ 484d8a7e3a7Sitojun if (IFA6_IS_INVALID(ia6)) { 485d8a7e3a7Sitojun in6_purgeaddr(&ia6->ia_ifa); 4860a8b9475Smarkus } else if (IFA6_IS_DEPRECATED(ia6)) { 487d8a7e3a7Sitojun ia6->ia6_flags |= IN6_IFF_DEPRECATED; 488d8a7e3a7Sitojun } else { 489d8a7e3a7Sitojun /* 490d8a7e3a7Sitojun * A new RA might have made a deprecated address 491d8a7e3a7Sitojun * preferred. 492d8a7e3a7Sitojun */ 493d8a7e3a7Sitojun ia6->ia6_flags &= ~IN6_IFF_DEPRECATED; 494d8a7e3a7Sitojun } 495d8a7e3a7Sitojun } 496d8a7e3a7Sitojun 497d8a7e3a7Sitojun /* expire prefix list */ 498119a433cSbluhm LIST_FOREACH_SAFE(pr, &nd_prefix, ndpr_entry, npr) { 499d8a7e3a7Sitojun /* 500287546eaSitojun * check prefix lifetime. 501287546eaSitojun * since pltime is just for autoconf, pltime processing for 502287546eaSitojun * prefix is not necessary. 503287546eaSitojun */ 504d8a7e3a7Sitojun if (pr->ndpr_vltime != ND6_INFINITE_LIFETIME && 5053212dc31Stholo time_second - pr->ndpr_lastupdate > pr->ndpr_vltime) { 506287546eaSitojun /* 507287546eaSitojun * address expiration and prefix expiration are 508d8a7e3a7Sitojun * separate. NEVER perform in6_purgeaddr here. 509287546eaSitojun */ 510287546eaSitojun 511287546eaSitojun prelist_remove(pr); 512119a433cSbluhm } 513287546eaSitojun } 514287546eaSitojun splx(s); 515287546eaSitojun } 516287546eaSitojun 517a09574ebSkettenis void 518a09574ebSkettenis nd6_timer(void *ignored_arg) 519a09574ebSkettenis { 520a09574ebSkettenis task_add(systq, &nd6_timer_task); 521a09574ebSkettenis } 522a09574ebSkettenis 52322770369Sitojun /* 52422770369Sitojun * Nuke neighbor cache/prefix/default router management table, right before 52522770369Sitojun * ifp goes away. 52622770369Sitojun */ 52722770369Sitojun void 528ee37ea65Smcbride nd6_purge(struct ifnet *ifp) 52922770369Sitojun { 53022770369Sitojun struct llinfo_nd6 *ln, *nln; 531d8a7e3a7Sitojun struct nd_defrouter *dr, *ndr; 53222770369Sitojun struct nd_prefix *pr, *npr; 53322770369Sitojun 53422770369Sitojun /* 535d8a7e3a7Sitojun * Nuke default router list entries toward ifp. 536d8a7e3a7Sitojun * We defer removal of default router list entries that is installed 537d8a7e3a7Sitojun * in the routing table, in order to keep additional side effects as 538d8a7e3a7Sitojun * small as possible. 53922770369Sitojun */ 540568012e6Sbluhm TAILQ_FOREACH_SAFE(dr, &nd_defrouter, dr_entry, ndr) { 541d8a7e3a7Sitojun if (dr->installed) 542d8a7e3a7Sitojun continue; 543d8a7e3a7Sitojun 54422770369Sitojun if (dr->ifp == ifp) 54522770369Sitojun defrtrlist_del(dr); 54622770369Sitojun } 547568012e6Sbluhm TAILQ_FOREACH_SAFE(dr, &nd_defrouter, dr_entry, ndr) { 548d8a7e3a7Sitojun if (!dr->installed) 549d8a7e3a7Sitojun continue; 550d8a7e3a7Sitojun 55122770369Sitojun if (dr->ifp == ifp) 55222770369Sitojun defrtrlist_del(dr); 55322770369Sitojun } 55422770369Sitojun 55522770369Sitojun /* Nuke prefix list entries toward ifp */ 556119a433cSbluhm LIST_FOREACH_SAFE(pr, &nd_prefix, ndpr_entry, npr) { 557e520a0ecSmpi if (pr->ndpr_ifp == ifp) 55822770369Sitojun prelist_remove(pr); 55922770369Sitojun } 56022770369Sitojun 561d3b1c214Sflorian if (ifp->if_xflags & IFXF_AUTOCONF6) { 56222770369Sitojun /* refresh default router list */ 563f4f4d166Sitojun defrouter_select(); 564e6e438a4Sitojun } 56522770369Sitojun 56622770369Sitojun /* 56722770369Sitojun * Nuke neighbor cache entries for the ifp. 56822770369Sitojun */ 56922770369Sitojun ln = llinfo_nd6.ln_next; 57022770369Sitojun while (ln && ln != &llinfo_nd6) { 57122770369Sitojun struct rtentry *rt; 57222770369Sitojun struct sockaddr_dl *sdl; 57322770369Sitojun 57422770369Sitojun nln = ln->ln_next; 57522770369Sitojun rt = ln->ln_rt; 57622770369Sitojun if (rt && rt->rt_gateway && 57722770369Sitojun rt->rt_gateway->sa_family == AF_LINK) { 578c7b7b779Sbluhm sdl = satosdl(rt->rt_gateway); 57922770369Sitojun if (sdl->sdl_index == ifp->if_index) 580d8a7e3a7Sitojun nln = nd6_free(rt, 0); 58122770369Sitojun } 58222770369Sitojun ln = nln; 58322770369Sitojun } 58422770369Sitojun } 58522770369Sitojun 586287546eaSitojun struct rtentry * 587f4d1af37Smikeb nd6_lookup(struct in6_addr *addr6, int create, struct ifnet *ifp, 588f4d1af37Smikeb u_int rtableid) 589287546eaSitojun { 590287546eaSitojun struct rtentry *rt; 591287546eaSitojun struct sockaddr_in6 sin6; 5925148b194Smpi int flags; 593287546eaSitojun 594287546eaSitojun bzero(&sin6, sizeof(sin6)); 595287546eaSitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 596287546eaSitojun sin6.sin6_family = AF_INET6; 597287546eaSitojun sin6.sin6_addr = *addr6; 5985148b194Smpi flags = (create) ? (RT_REPORT|RT_RESOLVE) : 0; 599d8a7e3a7Sitojun 6005148b194Smpi rt = rtalloc(sin6tosa(&sin6), flags, rtableid); 60116119bbfSmpi if (rt != NULL && (rt->rt_flags & RTF_LLINFO) == 0) { 602287546eaSitojun /* 603287546eaSitojun * This is the case for the default route. 604287546eaSitojun * If we want to create a neighbor cache for the address, we 605287546eaSitojun * should free the route for the destination and allocate an 606287546eaSitojun * interface route. 607287546eaSitojun */ 608287546eaSitojun if (create) { 60927ae666cSmpi rtfree(rt); 61027ae666cSmpi rt = NULL; 611287546eaSitojun } 612287546eaSitojun } 61316119bbfSmpi if (rt == NULL) { 614287546eaSitojun if (create && ifp) { 615cb24f5e5Sclaudio struct rt_addrinfo info; 6160ffd01d4Sbluhm int error; 617d374aaacSitojun 618287546eaSitojun /* 619287546eaSitojun * If no route is available and create is set, 620287546eaSitojun * we allocate a host route for the destination 621287546eaSitojun * and treat it like an interface route. 622287546eaSitojun * This hack is necessary for a neighbor which can't 623287546eaSitojun * be covered by our own prefix. 624287546eaSitojun */ 625287546eaSitojun struct ifaddr *ifa = 626c3c56496Sbluhm ifaof_ifpforaddr(sin6tosa(&sin6), ifp); 627287546eaSitojun if (ifa == NULL) 628287546eaSitojun return (NULL); 629287546eaSitojun 630287546eaSitojun /* 631287546eaSitojun * Create a new route. RTF_LLINFO is necessary 632287546eaSitojun * to create a Neighbor Cache entry for the 633287546eaSitojun * destination in nd6_rtrequest which will be 634*7ffb277fSbluhm * called in rtrequest. 635287546eaSitojun */ 636cb24f5e5Sclaudio bzero(&info, sizeof(info)); 637c29fc46aSmpi info.rti_flags = RTF_HOST | RTF_LLINFO; 638c3c56496Sbluhm info.rti_info[RTAX_DST] = sin6tosa(&sin6); 639c7b7b779Sbluhm info.rti_info[RTAX_GATEWAY] = sdltosa(ifp->if_sadl); 640*7ffb277fSbluhm error = rtrequest(RTM_ADD, &info, RTP_CONNECTED, &rt, 6410ffd01d4Sbluhm rtableid); 6420ffd01d4Sbluhm if (error) 643287546eaSitojun return (NULL); 644287546eaSitojun if (rt->rt_llinfo) { 645287546eaSitojun struct llinfo_nd6 *ln = 646287546eaSitojun (struct llinfo_nd6 *)rt->rt_llinfo; 647287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 648287546eaSitojun } 649f6e55599Sitojun } else 650287546eaSitojun return (NULL); 651287546eaSitojun } 652287546eaSitojun /* 653287546eaSitojun * Validation for the entry. 654d8a7e3a7Sitojun * Note that the check for rt_llinfo is necessary because a cloned 655d8a7e3a7Sitojun * route from a parent route that has the L flag (e.g. the default 656d8a7e3a7Sitojun * route to a p2p interface) may have the flag, too, while the 657d8a7e3a7Sitojun * destination is not actually a neighbor. 658287546eaSitojun */ 659287546eaSitojun if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 || 660d8a7e3a7Sitojun rt->rt_gateway->sa_family != AF_LINK || rt->rt_llinfo == NULL || 66109743a3aSmpi (ifp != NULL && rt->rt_ifp != ifp)) { 662287546eaSitojun if (create) { 663bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 66435075f95Smpi nd6log((LOG_DEBUG, "%s: failed to lookup %s (if=%s)\n", 66535075f95Smpi __func__, 666bbcf0337Smpi inet_ntop(AF_INET6, addr6, addr, sizeof(addr)), 667da592434Sitojun ifp ? ifp->if_xname : "unspec")); 668287546eaSitojun } 66916119bbfSmpi rtfree(rt); 670d8a7e3a7Sitojun return (NULL); 671287546eaSitojun } 672287546eaSitojun return (rt); 673287546eaSitojun } 674287546eaSitojun 675287546eaSitojun /* 676287546eaSitojun * Detect if a given IPv6 address identifies a neighbor on a given link. 677287546eaSitojun * XXX: should take care of the destination of a p2p link? 678287546eaSitojun */ 679287546eaSitojun int 680ee37ea65Smcbride nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp) 681287546eaSitojun { 682d8a7e3a7Sitojun struct nd_prefix *pr; 683ef6620bcSmpi struct in6_ifaddr *ia6; 684ef6620bcSmpi struct ifaddr *ifa; 685d8a7e3a7Sitojun struct rtentry *rt; 686287546eaSitojun 687cfb6b8dfSitojun /* 688cfb6b8dfSitojun * A link-local address is always a neighbor. 689cfb6b8dfSitojun * XXX: we should use the sin6_scope_id field rather than the embedded 690cfb6b8dfSitojun * interface index. 691d8a7e3a7Sitojun * XXX: a link does not necessarily specify a single interface. 692cfb6b8dfSitojun */ 693cfb6b8dfSitojun if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) && 694cfb6b8dfSitojun ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index) 695287546eaSitojun return (1); 696287546eaSitojun 697ef6620bcSmpi TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 698ef6620bcSmpi if (ifa->ifa_addr->sa_family != AF_INET6) 699ef6620bcSmpi continue; 700ef6620bcSmpi 701ef6620bcSmpi ia6 = ifatoia6(ifa); 702ef6620bcSmpi 703ef6620bcSmpi /* Prefix check down below. */ 704ef6620bcSmpi if (ia6->ia6_flags & IN6_IFF_AUTOCONF) 705ef6620bcSmpi continue; 706ef6620bcSmpi 707ef6620bcSmpi if (IN6_ARE_MASKED_ADDR_EQUAL(&addr->sin6_addr, 708ef6620bcSmpi &ia6->ia_addr.sin6_addr, 709ef6620bcSmpi &ia6->ia_prefixmask.sin6_addr)) 710ef6620bcSmpi return (1); 711ef6620bcSmpi } 712ef6620bcSmpi 713287546eaSitojun /* 714d8a7e3a7Sitojun * If the address matches one of our on-link prefixes, it should be a 715d8a7e3a7Sitojun * neighbor. 716287546eaSitojun */ 717545205eaSpyr LIST_FOREACH(pr, &nd_prefix, ndpr_entry) { 718d8a7e3a7Sitojun if (pr->ndpr_ifp != ifp) 719d8a7e3a7Sitojun continue; 720287546eaSitojun 721d8a7e3a7Sitojun if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) 722d8a7e3a7Sitojun continue; 723d8a7e3a7Sitojun 724d8a7e3a7Sitojun if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr, 725d8a7e3a7Sitojun &addr->sin6_addr, &pr->ndpr_mask)) 726d8a7e3a7Sitojun return (1); 727287546eaSitojun } 728d8a7e3a7Sitojun 729d8a7e3a7Sitojun /* 730287546eaSitojun * Even if the address matches none of our addresses, it might be 731287546eaSitojun * in the neighbor cache. 732287546eaSitojun */ 73316119bbfSmpi rt = nd6_lookup(&addr->sin6_addr, 0, ifp, ifp->if_rdomain); 73416119bbfSmpi if (rt != NULL) { 73516119bbfSmpi rtfree(rt); 736287546eaSitojun return (1); 73716119bbfSmpi } 738287546eaSitojun 739287546eaSitojun return (0); 740287546eaSitojun } 741287546eaSitojun 742287546eaSitojun /* 743287546eaSitojun * Free an nd6 llinfo entry. 744d8a7e3a7Sitojun * Since the function would cause significant changes in the kernel, DO NOT 745d8a7e3a7Sitojun * make it global, unless you have a strong reason for the change, and are sure 746d8a7e3a7Sitojun * that the change is safe. 747287546eaSitojun */ 748a0aa363cSjsing struct llinfo_nd6 * 749ee37ea65Smcbride nd6_free(struct rtentry *rt, int gc) 750287546eaSitojun { 75129760ae1Sitojun struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo, *next; 752c3c56496Sbluhm struct in6_addr in6 = satosin6(rt_key(rt))->sin6_addr; 753287546eaSitojun struct nd_defrouter *dr; 75481d38878Smpi int s; 755287546eaSitojun 756287546eaSitojun /* 757d8a7e3a7Sitojun * we used to have pfctlinput(PRC_HOSTDEAD) here. 758d8a7e3a7Sitojun * even though it is not harmful, it was not really necessary. 759287546eaSitojun */ 760f4f4d166Sitojun 7616e92dee6Sitojun s = splsoftnet(); 76281d38878Smpi if (!ip6_forwarding) { 763c3c56496Sbluhm dr = defrouter_lookup(&satosin6(rt_key(rt))->sin6_addr, 764f4f4d166Sitojun rt->rt_ifp); 765d8a7e3a7Sitojun 766d8a7e3a7Sitojun if (dr != NULL && dr->expire && 767d8a7e3a7Sitojun ln->ln_state == ND6_LLINFO_STALE && gc) { 768d8a7e3a7Sitojun /* 769d8a7e3a7Sitojun * If the reason for the deletion is just garbage 770d8a7e3a7Sitojun * collection, and the neighbor is an active default 771d8a7e3a7Sitojun * router, do not delete it. Instead, reset the GC 772d8a7e3a7Sitojun * timer using the router's lifetime. 773d8a7e3a7Sitojun * Simply deleting the entry would affect default 774d8a7e3a7Sitojun * router selection, which is not necessarily a good 775d8a7e3a7Sitojun * thing, especially when we're using router preference 776d8a7e3a7Sitojun * values. 777d8a7e3a7Sitojun * XXX: the check for ln_state would be redundant, 778d8a7e3a7Sitojun * but we intentionally keep it just in case. 779d8a7e3a7Sitojun */ 7803212dc31Stholo if (dr->expire > time_second * hz) { 7819631a17bSitojun nd6_llinfo_settimer(ln, 7823212dc31Stholo dr->expire - time_second * hz); 7839631a17bSitojun } else 7849631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 785d8a7e3a7Sitojun splx(s); 786d8a7e3a7Sitojun return (ln->ln_next); 787d8a7e3a7Sitojun } 788d8a7e3a7Sitojun 789f4f4d166Sitojun if (ln->ln_router || dr) { 790f4f4d166Sitojun /* 791f4f4d166Sitojun * rt6_flush must be called whether or not the neighbor 792f4f4d166Sitojun * is in the Default Router List. 793f4f4d166Sitojun * See a corresponding comment in nd6_na_input(). 794f4f4d166Sitojun */ 795f4f4d166Sitojun rt6_flush(&in6, rt->rt_ifp); 796f4f4d166Sitojun } 797f4f4d166Sitojun 798f4f4d166Sitojun if (dr) { 799f4f4d166Sitojun /* 8008b542bbeSpascoe * Unreachability of a router might affect the default 801f4f4d166Sitojun * router selection and on-link detection of advertised 802f4f4d166Sitojun * prefixes. 803f4f4d166Sitojun */ 804f4f4d166Sitojun 805f4f4d166Sitojun /* 806f4f4d166Sitojun * Temporarily fake the state to choose a new default 807f4f4d166Sitojun * router and to perform on-link determination of 80834deef1eSitojun * prefixes correctly. 809f4f4d166Sitojun * Below the state will be set correctly, 810f4f4d166Sitojun * or the entry itself will be deleted. 811f4f4d166Sitojun */ 812f4f4d166Sitojun ln->ln_state = ND6_LLINFO_INCOMPLETE; 813f4f4d166Sitojun 814f4f4d166Sitojun /* 815d8a7e3a7Sitojun * Since defrouter_select() does not affect the 816d8a7e3a7Sitojun * on-link determination and MIP6 needs the check 817d8a7e3a7Sitojun * before the default router selection, we perform 818d8a7e3a7Sitojun * the check now. 819f4f4d166Sitojun */ 820f4f4d166Sitojun pfxlist_onlink_check(); 821d8a7e3a7Sitojun 822d8a7e3a7Sitojun /* 823d8a7e3a7Sitojun * refresh default router list 824d8a7e3a7Sitojun */ 825d8a7e3a7Sitojun defrouter_select(); 826287546eaSitojun } 827287546eaSitojun } 828287546eaSitojun 82929760ae1Sitojun /* 83029760ae1Sitojun * Before deleting the entry, remember the next entry as the 83129760ae1Sitojun * return value. We need this because pfxlist_onlink_check() above 83229760ae1Sitojun * might have freed other entries (particularly the old next entry) as 83329760ae1Sitojun * a side effect (XXX). 83429760ae1Sitojun */ 83529760ae1Sitojun next = ln->ln_next; 83629760ae1Sitojun 83729760ae1Sitojun /* 83829760ae1Sitojun * Detach the route from the routing tree and the list of neighbor 83929760ae1Sitojun * caches, and disable the route entry not to be used in already 84029760ae1Sitojun * cached routes. 84129760ae1Sitojun */ 8427aa9499aSmpi rtdeletemsg(rt, rt->rt_ifp->if_rdomain); 84381d38878Smpi splx(s); 84429760ae1Sitojun 8450a2c5741Sitojun return (next); 846287546eaSitojun } 847287546eaSitojun 848287546eaSitojun /* 849287546eaSitojun * Upper-layer reachability hint for Neighbor Unreachability Detection. 850287546eaSitojun * 8518b542bbeSpascoe * XXX cost-effective methods? 852287546eaSitojun */ 853287546eaSitojun void 85460f4930eSmpi nd6_nud_hint(struct rtentry *rt, u_int rtableid) 855287546eaSitojun { 856287546eaSitojun struct llinfo_nd6 *ln; 857287546eaSitojun 85860f4930eSmpi if (rt == NULL) { 859287546eaSitojun return; 860287546eaSitojun } 861287546eaSitojun 862f6e55599Sitojun if ((rt->rt_flags & RTF_GATEWAY) != 0 || 863f6e55599Sitojun (rt->rt_flags & RTF_LLINFO) == 0 || 864f6e55599Sitojun !rt->rt_llinfo || !rt->rt_gateway || 865f6e55599Sitojun rt->rt_gateway->sa_family != AF_LINK) { 866287546eaSitojun /* This is not a host route. */ 867287546eaSitojun return; 868287546eaSitojun } 869287546eaSitojun 870287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 871804d8827Sitojun if (ln->ln_state < ND6_LLINFO_REACHABLE) 872287546eaSitojun return; 873287546eaSitojun 874f6e55599Sitojun /* 875f6e55599Sitojun * if we get upper-layer reachability confirmation many times, 876f6e55599Sitojun * it is possible we have false information. 877f6e55599Sitojun */ 878f6e55599Sitojun ln->ln_byhint++; 879f6e55599Sitojun if (ln->ln_byhint > nd6_maxnudhint) 880f6e55599Sitojun return; 881f6e55599Sitojun 882287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 8839631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 8849631a17bSitojun nd6_llinfo_settimer(ln, 8859631a17bSitojun (long)ND_IFINFO(rt->rt_ifp)->reachable * hz); 8869631a17bSitojun } 887287546eaSitojun } 888287546eaSitojun 889287546eaSitojun void 890dcb17c31Smpi nd6_rtrequest(struct ifnet *ifp, int req, struct rtentry *rt) 891287546eaSitojun { 892287546eaSitojun struct sockaddr *gate = rt->rt_gateway; 893287546eaSitojun struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 894287546eaSitojun struct ifaddr *ifa; 89570fc31beSrainer struct nd_defrouter *dr; 89670fc31beSrainer 89770fc31beSrainer if (req == RTM_DELETE && (rt->rt_flags & RTF_GATEWAY) && 89870fc31beSrainer (IN6_ARE_ADDR_EQUAL(&(satosin6(rt_key(rt)))->sin6_addr, 89970fc31beSrainer &in6addr_any) && rt_mask(rt) && (rt_mask(rt)->sa_len == 0 || 90070fc31beSrainer IN6_ARE_ADDR_EQUAL(&(satosin6(rt_mask(rt)))->sin6_addr, 90170fc31beSrainer &in6addr_any)))) { 902c3c56496Sbluhm dr = defrouter_lookup(&satosin6(gate)->sin6_addr, ifp); 90370fc31beSrainer if (dr) 90470fc31beSrainer dr->installed = 0; 90570fc31beSrainer } 906287546eaSitojun 907d8a7e3a7Sitojun if ((rt->rt_flags & RTF_GATEWAY) != 0) 908287546eaSitojun return; 909287546eaSitojun 910d8a7e3a7Sitojun if (nd6_need_cache(ifp) == 0 && (rt->rt_flags & RTF_HOST) == 0) { 911d8a7e3a7Sitojun /* 912d8a7e3a7Sitojun * This is probably an interface direct route for a link 913d8a7e3a7Sitojun * which does not need neighbor caches (e.g. fe80::%lo0/64). 914d8a7e3a7Sitojun * We do not need special treatment below for such a route. 915d8a7e3a7Sitojun * Moreover, the RTF_LLINFO flag which would be set below 916d8a7e3a7Sitojun * would annoy the ndp(8) command. 917d8a7e3a7Sitojun */ 918d8a7e3a7Sitojun return; 919d8a7e3a7Sitojun } 920d8a7e3a7Sitojun 921af1344beSbluhm if (req == RTM_RESOLVE && nd6_need_cache(ifp) == 0) { 922d8a7e3a7Sitojun /* 923af1344beSbluhm * For routing daemons like ospf6d we allow neighbor discovery 924af1344beSbluhm * based on the cloning route only. This allows us to sent 925af1344beSbluhm * packets directly into a network without having an address 926af1344beSbluhm * with matching prefix on the interface. If the cloning 927af1344beSbluhm * route is used for an stf interface, we would mistakenly 928af1344beSbluhm * make a neighbor cache for the host route, and would see 929af1344beSbluhm * strange neighbor solicitation for the corresponding 930af1344beSbluhm * destination. In order to avoid confusion, we check if the 931af1344beSbluhm * interface is suitable for neighbor discovery, and stop the 932d8a7e3a7Sitojun * process if not. Additionally, we remove the LLINFO flag 933d8a7e3a7Sitojun * so that ndp(8) will not try to get the neighbor information 934d8a7e3a7Sitojun * of the destination. 935d8a7e3a7Sitojun */ 936d8a7e3a7Sitojun rt->rt_flags &= ~RTF_LLINFO; 937d8a7e3a7Sitojun return; 938d8a7e3a7Sitojun } 939d8a7e3a7Sitojun 940287546eaSitojun switch (req) { 941287546eaSitojun case RTM_ADD: 942287546eaSitojun /* 943287546eaSitojun * There is no backward compatibility :) 944287546eaSitojun * 945287546eaSitojun * if ((rt->rt_flags & RTF_HOST) == 0 && 946287546eaSitojun * SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) 947287546eaSitojun * rt->rt_flags |= RTF_CLONING; 948287546eaSitojun */ 94948ebf8e1Sitojun if ((rt->rt_flags & RTF_CLONING) || 9505f3e87fcSmpi ((rt->rt_flags & (RTF_LLINFO | RTF_LOCAL)) && !ln)) { 951287546eaSitojun if (ln) 9529631a17bSitojun nd6_llinfo_settimer(ln, 0); 953d8a7e3a7Sitojun if ((rt->rt_flags & RTF_CLONING) != 0) 954287546eaSitojun break; 955287546eaSitojun } 956f4f4d166Sitojun /* 9578b542bbeSpascoe * In IPv4 code, we try to announce new RTF_ANNOUNCE entry here. 958f4f4d166Sitojun * We don't do that here since llinfo is not ready yet. 959f4f4d166Sitojun * 960f4f4d166Sitojun * There are also couple of other things to be discussed: 961f4f4d166Sitojun * - unsolicited NA code needs improvement beforehand 962f4f4d166Sitojun * - RFC2461 says we MAY send multicast unsolicited NA 963f4f4d166Sitojun * (7.2.6 paragraph 4), however, it also says that we 964f4f4d166Sitojun * SHOULD provide a mechanism to prevent multicast NA storm. 965f4f4d166Sitojun * we don't have anything like it right now. 966841d7adbSitojun * note that the mechanism needs a mutual agreement 967f4f4d166Sitojun * between proxies, which means that we need to implement 968841d7adbSitojun * a new protocol, or a new kludge. 969841d7adbSitojun * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA. 970f4f4d166Sitojun * we need to check ip6forwarding before sending it. 971f4f4d166Sitojun * (or should we allow proxy ND configuration only for 972f4f4d166Sitojun * routers? there's no mention about proxy ND from hosts) 973f4f4d166Sitojun */ 974f4f4d166Sitojun #if 0 975f4f4d166Sitojun /* XXX it does not work */ 976287546eaSitojun if (rt->rt_flags & RTF_ANNOUNCE) 977287546eaSitojun nd6_na_output(ifp, 978c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr, 979c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr, 980287546eaSitojun ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, 981f4f4d166Sitojun 1, NULL); 982f4f4d166Sitojun #endif 983287546eaSitojun /* FALLTHROUGH */ 984287546eaSitojun case RTM_RESOLVE: 985287546eaSitojun if (gate->sa_family != AF_LINK || 986cfc71c8bSclaudio gate->sa_len < sizeof(struct sockaddr_dl)) { 98786b61919Smpi log(LOG_DEBUG, "%s: bad gateway value: %s\n", 98886b61919Smpi __func__, ifp->if_xname); 989287546eaSitojun break; 990287546eaSitojun } 991c7b7b779Sbluhm satosdl(gate)->sdl_type = ifp->if_type; 992c7b7b779Sbluhm satosdl(gate)->sdl_index = ifp->if_index; 993d374aaacSitojun if (ln != NULL) 994287546eaSitojun break; /* This happens on a route change */ 995287546eaSitojun /* 996287546eaSitojun * Case 2: This route may come from cloning, or a manual route 997287546eaSitojun * add with a LL address. 998287546eaSitojun */ 9997371a15dStedu ln = malloc(sizeof(*ln), M_RTABLE, M_NOWAIT | M_ZERO); 1000287546eaSitojun rt->rt_llinfo = (caddr_t)ln; 1001287546eaSitojun if (!ln) { 100286b61919Smpi log(LOG_DEBUG, "%s: malloc failed\n", __func__); 1003287546eaSitojun break; 1004287546eaSitojun } 1005287546eaSitojun nd6_inuse++; 1006287546eaSitojun nd6_allocated++; 1007287546eaSitojun ln->ln_rt = rt; 10089631a17bSitojun timeout_set(&ln->ln_timer_ch, nd6_llinfo_timer, ln); 1009287546eaSitojun /* this is required for "ndp" command. - shin */ 1010287546eaSitojun if (req == RTM_ADD) { 1011287546eaSitojun /* 1012287546eaSitojun * gate should have some valid AF_LINK entry, 1013287546eaSitojun * and ln->ln_expire should have some lifetime 1014287546eaSitojun * which is specified by ndp command. 1015287546eaSitojun */ 1016287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 1017f6e55599Sitojun ln->ln_byhint = 0; 1018287546eaSitojun } else { 1019287546eaSitojun /* 1020287546eaSitojun * When req == RTM_RESOLVE, rt is created and 1021287546eaSitojun * initialized in rtrequest(), so rt_expire is 0. 1022287546eaSitojun */ 1023287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 10249631a17bSitojun nd6_llinfo_settimer(ln, 0); 1025287546eaSitojun } 1026287546eaSitojun rt->rt_flags |= RTF_LLINFO; 1027287546eaSitojun ln->ln_next = llinfo_nd6.ln_next; 1028287546eaSitojun llinfo_nd6.ln_next = ln; 1029287546eaSitojun ln->ln_prev = &llinfo_nd6; 1030287546eaSitojun ln->ln_next->ln_prev = ln; 1031287546eaSitojun 1032287546eaSitojun /* 1033f3fcf2f3Smcbride * If we have too many cache entries, initiate immediate 1034f3fcf2f3Smcbride * purging for some "less recently used" entries. Note that 1035f3fcf2f3Smcbride * we cannot directly call nd6_free() here because it would 1036f3fcf2f3Smcbride * cause re-entering rtable related routines triggering an LOR 1037f3fcf2f3Smcbride * problem for FreeBSD. 1038f3fcf2f3Smcbride */ 1039f3fcf2f3Smcbride if (ip6_neighborgcthresh >= 0 && 1040f3fcf2f3Smcbride nd6_inuse >= ip6_neighborgcthresh) { 1041f3fcf2f3Smcbride int i; 1042f3fcf2f3Smcbride 1043f3fcf2f3Smcbride for (i = 0; i < 10 && llinfo_nd6.ln_prev != ln; i++) { 1044f3fcf2f3Smcbride struct llinfo_nd6 *ln_end = llinfo_nd6.ln_prev; 1045f3fcf2f3Smcbride 1046f3fcf2f3Smcbride /* Move this entry to the head */ 1047f3fcf2f3Smcbride LN_DEQUEUE(ln_end); 1048f3fcf2f3Smcbride LN_INSERTHEAD(ln_end); 1049f3fcf2f3Smcbride 1050f3fcf2f3Smcbride if (ND6_LLINFO_PERMANENT(ln_end)) 1051f3fcf2f3Smcbride continue; 1052f3fcf2f3Smcbride 1053f3fcf2f3Smcbride if (ln_end->ln_state > ND6_LLINFO_INCOMPLETE) 1054f3fcf2f3Smcbride ln_end->ln_state = ND6_LLINFO_STALE; 1055f3fcf2f3Smcbride else 1056f3fcf2f3Smcbride ln_end->ln_state = ND6_LLINFO_PURGE; 1057f3fcf2f3Smcbride nd6_llinfo_settimer(ln_end, 0); 1058f3fcf2f3Smcbride } 1059f3fcf2f3Smcbride } 1060f3fcf2f3Smcbride 1061f3fcf2f3Smcbride /* 1062287546eaSitojun * check if rt_key(rt) is one of my address assigned 1063287546eaSitojun * to the interface. 1064287546eaSitojun */ 106586b61919Smpi ifa = &in6ifa_ifpwithaddr(ifp, 1066c3c56496Sbluhm &satosin6(rt_key(rt))->sin6_addr)->ia_ifa; 1067287546eaSitojun if (ifa) { 10689631a17bSitojun nd6_llinfo_settimer(ln, -1); 1069287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 1070f6e55599Sitojun ln->ln_byhint = 0; 1071fac399ceSmpi KASSERT(ifa == rt->rt_ifa); 1072f4f4d166Sitojun } else if (rt->rt_flags & RTF_ANNOUNCE) { 10739631a17bSitojun nd6_llinfo_settimer(ln, -1); 1074f4f4d166Sitojun ln->ln_state = ND6_LLINFO_REACHABLE; 1075f6e55599Sitojun ln->ln_byhint = 0; 1076f4f4d166Sitojun 1077f4f4d166Sitojun /* join solicited node multicast for proxy ND */ 1078f4f4d166Sitojun if (ifp->if_flags & IFF_MULTICAST) { 1079f4f4d166Sitojun struct in6_addr llsol; 1080f4f4d166Sitojun int error; 1081f4f4d166Sitojun 1082c3c56496Sbluhm llsol = satosin6(rt_key(rt))->sin6_addr; 1083f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 1084f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 1085f4f4d166Sitojun llsol.s6_addr32[1] = 0; 1086f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 1087f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 1088f4f4d166Sitojun 1089d8a7e3a7Sitojun if (in6_addmulti(&llsol, ifp, &error)) { 1090bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 1091d8a7e3a7Sitojun nd6log((LOG_ERR, "%s: failed to join " 1092d8a7e3a7Sitojun "%s (errno=%d)\n", ifp->if_xname, 1093bbcf0337Smpi inet_ntop(AF_INET6, &llsol, 1094bbcf0337Smpi addr, sizeof(addr)), 1095bbcf0337Smpi error)); 1096d8a7e3a7Sitojun } 1097f4f4d166Sitojun } 1098287546eaSitojun } 1099287546eaSitojun break; 1100287546eaSitojun 1101287546eaSitojun case RTM_DELETE: 1102287546eaSitojun if (!ln) 1103287546eaSitojun break; 1104f4f4d166Sitojun /* leave from solicited node multicast for proxy ND */ 1105f4f4d166Sitojun if ((rt->rt_flags & RTF_ANNOUNCE) != 0 && 1106f4f4d166Sitojun (ifp->if_flags & IFF_MULTICAST) != 0) { 1107f4f4d166Sitojun struct in6_addr llsol; 1108f4f4d166Sitojun struct in6_multi *in6m; 1109f4f4d166Sitojun 1110c3c56496Sbluhm llsol = satosin6(rt_key(rt))->sin6_addr; 1111f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 1112f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 1113f4f4d166Sitojun llsol.s6_addr32[1] = 0; 1114f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 1115f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 1116f4f4d166Sitojun 1117f4f4d166Sitojun IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1118f4f4d166Sitojun if (in6m) 1119f4f4d166Sitojun in6_delmulti(in6m); 1120f4f4d166Sitojun } 1121287546eaSitojun nd6_inuse--; 1122287546eaSitojun ln->ln_next->ln_prev = ln->ln_prev; 1123287546eaSitojun ln->ln_prev->ln_next = ln->ln_next; 1124287546eaSitojun ln->ln_prev = NULL; 11259631a17bSitojun nd6_llinfo_settimer(ln, -1); 1126287546eaSitojun rt->rt_llinfo = 0; 1127287546eaSitojun rt->rt_flags &= ~RTF_LLINFO; 1128287546eaSitojun m_freem(ln->ln_hold); 1129dd168dc2Stedu free(ln, M_RTABLE, 0); 1130287546eaSitojun } 1131287546eaSitojun } 1132287546eaSitojun 1133287546eaSitojun int 1134ee37ea65Smcbride nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp) 1135287546eaSitojun { 1136287546eaSitojun struct in6_ndireq *ndi = (struct in6_ndireq *)data; 1137287546eaSitojun struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data; 1138287546eaSitojun struct rtentry *rt; 1139ee3c93eeSbluhm int error = 0; 1140287546eaSitojun int s; 1141287546eaSitojun 1142287546eaSitojun switch (cmd) { 1143d6b9e9b9Sitojun case SIOCGIFINFO_IN6: 1144d6b9e9b9Sitojun ndi->ndi = *ND_IFINFO(ifp); 114502dac871Sderaadt memset(&ndi->ndi.randomseed0, 0, sizeof ndi->ndi.randomseed0); 114602dac871Sderaadt memset(&ndi->ndi.randomseed1, 0, sizeof ndi->ndi.randomseed1); 114702dac871Sderaadt memset(&ndi->ndi.randomid, 0, sizeof ndi->ndi.randomid); 1148287546eaSitojun break; 1149d374aaacSitojun case SIOCSIFINFO_FLAGS: 1150d6b9e9b9Sitojun ND_IFINFO(ifp)->flags = ndi->ndi.flags; 1151d374aaacSitojun break; 1152f4f4d166Sitojun case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */ 1153d8a7e3a7Sitojun /* sync kernel routing table with the default router list */ 1154d8a7e3a7Sitojun defrouter_reset(); 1155f4f4d166Sitojun defrouter_select(); 1156287546eaSitojun break; 1157287546eaSitojun case SIOCSPFXFLUSH_IN6: 1158287546eaSitojun { 1159287546eaSitojun /* flush all the prefix advertised by routers */ 1160119a433cSbluhm struct nd_prefix *pr, *npr; 1161287546eaSitojun 11626e92dee6Sitojun s = splsoftnet(); 1163db657d52Sbluhm /* First purge the addresses referenced by a prefix. */ 1164119a433cSbluhm LIST_FOREACH_SAFE(pr, &nd_prefix, ndpr_entry, npr) { 1165b9e83c60Sbluhm struct in6_ifaddr *ia6, *ia6_next; 1166d8a7e3a7Sitojun 1167d8a7e3a7Sitojun if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1168d8a7e3a7Sitojun continue; /* XXX */ 1169d8a7e3a7Sitojun 1170d8a7e3a7Sitojun /* do we really have to remove addresses as well? */ 1171b9e83c60Sbluhm TAILQ_FOREACH_SAFE(ia6, &in6_ifaddr, ia_list, ia6_next) { 1172b9e83c60Sbluhm if ((ia6->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1173d8a7e3a7Sitojun continue; 1174d8a7e3a7Sitojun 1175b9e83c60Sbluhm if (ia6->ia6_ndpr == pr) 1176b9e83c60Sbluhm in6_purgeaddr(&ia6->ia_ifa); 1177d8a7e3a7Sitojun } 1178db657d52Sbluhm } 1179db657d52Sbluhm /* 1180db657d52Sbluhm * Purging the addresses might remove the prefix as well. 1181db657d52Sbluhm * So run the loop again to access only prefixes that have 1182db657d52Sbluhm * not been freed already. 1183db657d52Sbluhm */ 1184119a433cSbluhm LIST_FOREACH_SAFE(pr, &nd_prefix, ndpr_entry, npr) { 1185db657d52Sbluhm if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1186db657d52Sbluhm continue; /* XXX */ 1187db657d52Sbluhm 1188287546eaSitojun prelist_remove(pr); 1189287546eaSitojun } 1190287546eaSitojun splx(s); 1191287546eaSitojun break; 1192287546eaSitojun } 1193287546eaSitojun case SIOCSRTRFLUSH_IN6: 1194287546eaSitojun { 1195287546eaSitojun /* flush all the default routers */ 1196568012e6Sbluhm struct nd_defrouter *dr, *ndr; 1197287546eaSitojun 11986e92dee6Sitojun s = splsoftnet(); 1199d8a7e3a7Sitojun defrouter_reset(); 1200568012e6Sbluhm TAILQ_FOREACH_SAFE(dr, &nd_defrouter, dr_entry, ndr) 1201287546eaSitojun defrtrlist_del(dr); 1202d8a7e3a7Sitojun defrouter_select(); 1203287546eaSitojun splx(s); 1204287546eaSitojun break; 1205287546eaSitojun } 1206287546eaSitojun case SIOCGNBRINFO_IN6: 1207287546eaSitojun { 1208287546eaSitojun struct llinfo_nd6 *ln; 1209287546eaSitojun struct in6_addr nb_addr = nbi->addr; /* make local for safety */ 1210287546eaSitojun 1211287546eaSitojun /* 1212287546eaSitojun * XXX: KAME specific hack for scoped addresses 1213287546eaSitojun * XXXX: for other scopes than link-local? 1214287546eaSitojun */ 1215287546eaSitojun if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) || 1216287546eaSitojun IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) { 1217287546eaSitojun u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2]; 1218287546eaSitojun 1219287546eaSitojun if (*idp == 0) 1220287546eaSitojun *idp = htons(ifp->if_index); 1221287546eaSitojun } 1222287546eaSitojun 12236e92dee6Sitojun s = splsoftnet(); 122416119bbfSmpi rt = nd6_lookup(&nb_addr, 0, ifp, ifp->if_rdomain); 122516119bbfSmpi if (rt == NULL || 1226d8a7e3a7Sitojun (ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) { 1227287546eaSitojun error = EINVAL; 122816119bbfSmpi rtfree(rt); 122991e69634Sitojun splx(s); 1230287546eaSitojun break; 1231287546eaSitojun } 1232287546eaSitojun nbi->state = ln->ln_state; 1233287546eaSitojun nbi->asked = ln->ln_asked; 1234287546eaSitojun nbi->isrouter = ln->ln_router; 1235287546eaSitojun nbi->expire = ln->ln_expire; 123616119bbfSmpi rtfree(rt); 1237287546eaSitojun splx(s); 1238287546eaSitojun 1239287546eaSitojun break; 1240287546eaSitojun } 1241287546eaSitojun } 1242287546eaSitojun return (error); 1243287546eaSitojun } 1244287546eaSitojun 1245287546eaSitojun /* 1246287546eaSitojun * Create neighbor cache entry and cache link-layer address, 1247287546eaSitojun * on reception of inbound ND6 packets. (RS/RA/NS/redirect) 1248ee37ea65Smcbride * 1249ee37ea65Smcbride * type - ICMP6 type 1250ee37ea65Smcbride * code - type dependent information 1251287546eaSitojun */ 1252db435b2aSmpi void 1253ee37ea65Smcbride nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr, 1254ee37ea65Smcbride int lladdrlen, int type, int code) 1255287546eaSitojun { 1256287546eaSitojun struct rtentry *rt = NULL; 1257287546eaSitojun struct llinfo_nd6 *ln = NULL; 1258287546eaSitojun int is_newentry; 1259287546eaSitojun struct sockaddr_dl *sdl = NULL; 1260287546eaSitojun int do_update; 1261287546eaSitojun int olladdr; 1262287546eaSitojun int llchange; 1263287546eaSitojun int newstate = 0; 1264287546eaSitojun 1265287546eaSitojun if (!ifp) 1266287546eaSitojun panic("ifp == NULL in nd6_cache_lladdr"); 1267287546eaSitojun if (!from) 1268287546eaSitojun panic("from == NULL in nd6_cache_lladdr"); 1269287546eaSitojun 1270287546eaSitojun /* nothing must be updated for unspecified address */ 1271287546eaSitojun if (IN6_IS_ADDR_UNSPECIFIED(from)) 1272db435b2aSmpi return; 1273287546eaSitojun 1274287546eaSitojun /* 1275287546eaSitojun * Validation about ifp->if_addrlen and lladdrlen must be done in 1276287546eaSitojun * the caller. 1277287546eaSitojun * 12788b542bbeSpascoe * XXX If the link does not have link-layer address, what should 1279287546eaSitojun * we do? (ifp->if_addrlen == 0) 1280287546eaSitojun * Spec says nothing in sections for RA, RS and NA. There's small 1281287546eaSitojun * description on it in NS section (RFC 2461 7.2.3). 1282287546eaSitojun */ 1283287546eaSitojun 1284f4d1af37Smikeb rt = nd6_lookup(from, 0, ifp, ifp->if_rdomain); 128516119bbfSmpi if (rt == NULL) { 1286287546eaSitojun #if 0 1287287546eaSitojun /* nothing must be done if there's no lladdr */ 1288287546eaSitojun if (!lladdr || !lladdrlen) 1289287546eaSitojun return NULL; 1290287546eaSitojun #endif 1291287546eaSitojun 12925148b194Smpi rt = nd6_lookup(from, 1, ifp, ifp->if_rdomain); 1293287546eaSitojun is_newentry = 1; 12940a2c5741Sitojun } else { 12950a2c5741Sitojun /* do nothing if static ndp is set */ 129616119bbfSmpi if (rt->rt_flags & RTF_STATIC) { 129716119bbfSmpi rtfree(rt); 1298db435b2aSmpi return; 129916119bbfSmpi } 1300287546eaSitojun is_newentry = 0; 13010a2c5741Sitojun } 1302287546eaSitojun 1303287546eaSitojun if (!rt) 1304db435b2aSmpi return; 1305287546eaSitojun if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) { 1306287546eaSitojun fail: 1307d8a7e3a7Sitojun (void)nd6_free(rt, 0); 130816119bbfSmpi rtfree(rt); 1309db435b2aSmpi return; 1310287546eaSitojun } 1311287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1312287546eaSitojun if (!ln) 1313287546eaSitojun goto fail; 1314287546eaSitojun if (!rt->rt_gateway) 1315287546eaSitojun goto fail; 1316287546eaSitojun if (rt->rt_gateway->sa_family != AF_LINK) 1317287546eaSitojun goto fail; 1318c7b7b779Sbluhm sdl = satosdl(rt->rt_gateway); 1319287546eaSitojun 1320287546eaSitojun olladdr = (sdl->sdl_alen) ? 1 : 0; 1321287546eaSitojun if (olladdr && lladdr) { 1322287546eaSitojun if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 1323287546eaSitojun llchange = 1; 1324287546eaSitojun else 1325287546eaSitojun llchange = 0; 1326287546eaSitojun } else 1327287546eaSitojun llchange = 0; 1328287546eaSitojun 1329287546eaSitojun /* 1330287546eaSitojun * newentry olladdr lladdr llchange (*=record) 1331287546eaSitojun * 0 n n -- (1) 1332287546eaSitojun * 0 y n -- (2) 1333287546eaSitojun * 0 n y -- (3) * STALE 1334287546eaSitojun * 0 y y n (4) * 1335287546eaSitojun * 0 y y y (5) * STALE 1336287546eaSitojun * 1 -- n -- (6) NOSTATE(= PASSIVE) 1337287546eaSitojun * 1 -- y -- (7) * STALE 1338287546eaSitojun */ 1339287546eaSitojun 1340c8a7c9e3Sbluhm if (llchange) { 1341bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 1342c8a7c9e3Sbluhm log(LOG_INFO, "ndp info overwritten for %s by %s on %s\n", 1343bbcf0337Smpi inet_ntop(AF_INET6, from, addr, sizeof(addr)), 1344bbcf0337Smpi ether_sprintf(lladdr), ifp->if_xname); 1345c8a7c9e3Sbluhm } 1346287546eaSitojun if (lladdr) { /* (3-5) and (7) */ 1347287546eaSitojun /* 1348287546eaSitojun * Record source link-layer address 1349287546eaSitojun * XXX is it dependent to ifp->if_type? 1350287546eaSitojun */ 1351287546eaSitojun sdl->sdl_alen = ifp->if_addrlen; 1352287546eaSitojun bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 1353287546eaSitojun } 1354287546eaSitojun 1355287546eaSitojun if (!is_newentry) { 1356d8a7e3a7Sitojun if ((!olladdr && lladdr) || /* (3) */ 1357d8a7e3a7Sitojun (olladdr && lladdr && llchange)) { /* (5) */ 1358287546eaSitojun do_update = 1; 1359287546eaSitojun newstate = ND6_LLINFO_STALE; 1360287546eaSitojun } else /* (1-2,4) */ 1361287546eaSitojun do_update = 0; 1362287546eaSitojun } else { 1363287546eaSitojun do_update = 1; 1364287546eaSitojun if (!lladdr) /* (6) */ 1365287546eaSitojun newstate = ND6_LLINFO_NOSTATE; 1366287546eaSitojun else /* (7) */ 1367287546eaSitojun newstate = ND6_LLINFO_STALE; 1368287546eaSitojun } 1369287546eaSitojun 1370287546eaSitojun if (do_update) { 1371287546eaSitojun /* 1372287546eaSitojun * Update the state of the neighbor cache. 1373287546eaSitojun */ 1374287546eaSitojun ln->ln_state = newstate; 1375287546eaSitojun 1376287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 13778a7bb304Sitojun /* 13788a7bb304Sitojun * XXX: since nd6_output() below will cause 13798b542bbeSpascoe * state transition to DELAY and reset the timer, 13808a7bb304Sitojun * we must set the timer now, although it is actually 13818a7bb304Sitojun * meaningless. 13828a7bb304Sitojun */ 13839631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 13848a7bb304Sitojun 1385287546eaSitojun if (ln->ln_hold) { 1386e212adedSkrw struct mbuf *n = ln->ln_hold; 1387e212adedSkrw ln->ln_hold = NULL; 13886afad192Sitojun /* 13896afad192Sitojun * we assume ifp is not a p2p here, so just 13906afad192Sitojun * set the 2nd argument as the 1st one. 13916afad192Sitojun */ 1392bc3c7896Smpi nd6_output(ifp, n, satosin6(rt_key(rt)), rt); 1393e212adedSkrw if (ln->ln_hold == n) { 1394e212adedSkrw /* n is back in ln_hold. Discard. */ 1395e212adedSkrw m_freem(ln->ln_hold); 13968a7bb304Sitojun ln->ln_hold = NULL; 1397287546eaSitojun } 1398e212adedSkrw } 1399287546eaSitojun } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 1400287546eaSitojun /* probe right away */ 14019631a17bSitojun nd6_llinfo_settimer((void *)ln, 0); 1402287546eaSitojun } 1403287546eaSitojun } 1404287546eaSitojun 1405287546eaSitojun /* 1406287546eaSitojun * ICMP6 type dependent behavior. 1407287546eaSitojun * 1408287546eaSitojun * NS: clear IsRouter if new entry 1409287546eaSitojun * RS: clear IsRouter 1410287546eaSitojun * RA: set IsRouter if there's lladdr 1411287546eaSitojun * redir: clear IsRouter if new entry 1412287546eaSitojun * 1413287546eaSitojun * RA case, (1): 1414287546eaSitojun * The spec says that we must set IsRouter in the following cases: 1415287546eaSitojun * - If lladdr exist, set IsRouter. This means (1-5). 1416287546eaSitojun * - If it is old entry (!newentry), set IsRouter. This means (7). 1417287546eaSitojun * So, based on the spec, in (1-5) and (7) cases we must set IsRouter. 14188b542bbeSpascoe * A question arises for (1) case. (1) case has no lladdr in the 1419287546eaSitojun * neighbor cache, this is similar to (6). 1420287546eaSitojun * This case is rare but we figured that we MUST NOT set IsRouter. 1421287546eaSitojun * 1422287546eaSitojun * newentry olladdr lladdr llchange NS RS RA redir 1423287546eaSitojun * D R 1424287546eaSitojun * 0 n n -- (1) c ? s 1425287546eaSitojun * 0 y n -- (2) c s s 1426287546eaSitojun * 0 n y -- (3) c s s 1427287546eaSitojun * 0 y y n (4) c s s 1428287546eaSitojun * 0 y y y (5) c s s 1429287546eaSitojun * 1 -- n -- (6) c c c s 1430287546eaSitojun * 1 -- y -- (7) c c s c s 1431287546eaSitojun * 1432287546eaSitojun * (c=clear s=set) 1433287546eaSitojun */ 1434287546eaSitojun switch (type & 0xff) { 1435287546eaSitojun case ND_NEIGHBOR_SOLICIT: 1436287546eaSitojun /* 1437287546eaSitojun * New entry must have is_router flag cleared. 1438287546eaSitojun */ 1439287546eaSitojun if (is_newentry) /* (6-7) */ 1440287546eaSitojun ln->ln_router = 0; 1441287546eaSitojun break; 1442287546eaSitojun case ND_REDIRECT: 1443287546eaSitojun /* 1444287546eaSitojun * If the icmp is a redirect to a better router, always set the 1445287546eaSitojun * is_router flag. Otherwise, if the entry is newly created, 1446287546eaSitojun * clear the flag. [RFC 2461, sec 8.3] 1447287546eaSitojun */ 1448287546eaSitojun if (code == ND_REDIRECT_ROUTER) 1449287546eaSitojun ln->ln_router = 1; 1450287546eaSitojun else if (is_newentry) /* (6-7) */ 1451287546eaSitojun ln->ln_router = 0; 1452287546eaSitojun break; 1453287546eaSitojun case ND_ROUTER_SOLICIT: 1454287546eaSitojun /* 1455287546eaSitojun * is_router flag must always be cleared. 1456287546eaSitojun */ 1457287546eaSitojun ln->ln_router = 0; 1458287546eaSitojun break; 1459287546eaSitojun case ND_ROUTER_ADVERT: 1460287546eaSitojun /* 1461287546eaSitojun * Mark an entry with lladdr as a router. 1462287546eaSitojun */ 1463d8a7e3a7Sitojun if ((!is_newentry && (olladdr || lladdr)) || /* (2-5) */ 1464d8a7e3a7Sitojun (is_newentry && lladdr)) { /* (7) */ 1465287546eaSitojun ln->ln_router = 1; 1466287546eaSitojun } 1467287546eaSitojun break; 1468287546eaSitojun } 1469287546eaSitojun 147050ccc024Sitojun /* 147150ccc024Sitojun * When the link-layer address of a router changes, select the 147250ccc024Sitojun * best router again. In particular, when the neighbor entry is newly 147350ccc024Sitojun * created, it might affect the selection policy. 147450ccc024Sitojun * Question: can we restrict the first condition to the "is_newentry" 147550ccc024Sitojun * case? 147650ccc024Sitojun * XXX: when we hear an RA from a new router with the link-layer 147750ccc024Sitojun * address option, defrouter_select() is called twice, since 147850ccc024Sitojun * defrtrlist_update called the function as well. However, I believe 147950ccc024Sitojun * we can compromise the overhead, since it only happens the first 148050ccc024Sitojun * time. 148150ccc024Sitojun */ 1482d3b1c214Sflorian if (do_update && ln->ln_router && (ifp->if_xflags & IFXF_AUTOCONF6)) 148350ccc024Sitojun defrouter_select(); 148416119bbfSmpi 148516119bbfSmpi rtfree(rt); 1486287546eaSitojun } 1487287546eaSitojun 1488a0aa363cSjsing void 1489ee37ea65Smcbride nd6_slowtimo(void *ignored_arg) 1490287546eaSitojun { 14916e92dee6Sitojun int s = splsoftnet(); 1492b3c1e4c1Sitojun struct nd_ifinfo *nd6if; 1493d6b9e9b9Sitojun struct ifnet *ifp; 1494287546eaSitojun 1495b3c1e4c1Sitojun timeout_set(&nd6_slowtimo_ch, nd6_slowtimo, NULL); 149629e86e5eSblambert timeout_add_sec(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL); 1497d814b14cSbluhm TAILQ_FOREACH(ifp, &ifnet, if_list) { 1498d6b9e9b9Sitojun nd6if = ND_IFINFO(ifp); 1499287546eaSitojun if (nd6if->basereachable && /* already initialized */ 1500287546eaSitojun (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) { 1501287546eaSitojun /* 1502287546eaSitojun * Since reachable time rarely changes by router 1503287546eaSitojun * advertisements, we SHOULD insure that a new random 1504287546eaSitojun * value gets recomputed at least once every few hours. 1505287546eaSitojun * (RFC 2461, 6.3.4) 1506287546eaSitojun */ 1507287546eaSitojun nd6if->recalctm = nd6_recalc_reachtm_interval; 1508287546eaSitojun nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable); 1509287546eaSitojun } 1510287546eaSitojun } 1511287546eaSitojun splx(s); 1512287546eaSitojun } 1513287546eaSitojun 1514287546eaSitojun int 1515bc3c7896Smpi nd6_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr_in6 *dst, 1516bc3c7896Smpi struct rtentry *rt0) 1517287546eaSitojun { 1518b3c1e4c1Sitojun struct mbuf *m = m0; 1519b3c1e4c1Sitojun struct rtentry *rt = rt0; 1520287546eaSitojun struct llinfo_nd6 *ln = NULL; 152116119bbfSmpi int created = 0, error = 0; 1522287546eaSitojun 1523287546eaSitojun if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr)) 1524287546eaSitojun goto sendpkt; 1525287546eaSitojun 1526d8a7e3a7Sitojun if (nd6_need_cache(ifp) == 0) 1527287546eaSitojun goto sendpkt; 1528287546eaSitojun 1529287546eaSitojun /* 15308c023157Smpi * next hop determination. 1531287546eaSitojun */ 15328c023157Smpi if (rt0 != NULL) { 15338c023157Smpi error = rt_checkgate(ifp, rt0, sin6tosa(dst), 15348c023157Smpi m->m_pkthdr.ph_rtableid, &rt); 15358c023157Smpi if (error) { 15368c023157Smpi m_freem(m); 15378c023157Smpi return (error); 1538287546eaSitojun } 1539cfb6b8dfSitojun 1540cfb6b8dfSitojun /* 1541cfb6b8dfSitojun * We skip link-layer address resolution and NUD 1542cfb6b8dfSitojun * if the gateway is not a neighbor from ND point 1543d8a7e3a7Sitojun * of view, regardless of the value of nd_ifinfo.flags. 154434deef1eSitojun * The second condition is a bit tricky; we skip 1545cfb6b8dfSitojun * if the gateway is our own address, which is 1546cfb6b8dfSitojun * sometimes used to install a route to a p2p link. 1547cfb6b8dfSitojun */ 15488c023157Smpi if ((ifp->if_flags & IFF_POINTOPOINT) && 15498c023157Smpi ((nd6_is_addr_neighbor(satosin6(rt_key(rt)), ifp) == 0) || 15508c023157Smpi in6ifa_ifpwithaddr(ifp, &satosin6(rt_key(rt))->sin6_addr))) 1551cfb6b8dfSitojun goto sendpkt; 1552cfb6b8dfSitojun } 1553cfb6b8dfSitojun 1554287546eaSitojun /* 1555287546eaSitojun * Address resolution or Neighbor Unreachability Detection 1556287546eaSitojun * for the next hop. 1557287546eaSitojun * At this point, the destination of the packet must be a unicast 1558287546eaSitojun * or an anycast address(i.e. not a multicast). 1559287546eaSitojun */ 1560287546eaSitojun 1561287546eaSitojun /* Look up the neighbor cache for the nexthop */ 1562287546eaSitojun if (rt && (rt->rt_flags & RTF_LLINFO) != 0) 1563287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1564287546eaSitojun else { 1565cfb6b8dfSitojun /* 1566cfb6b8dfSitojun * Since nd6_is_addr_neighbor() internally calls nd6_lookup(), 1567cfb6b8dfSitojun * the condition below is not very efficient. But we believe 1568cfb6b8dfSitojun * it is tolerable, because this should be a rare case. 1569cfb6b8dfSitojun */ 157016119bbfSmpi if (nd6_is_addr_neighbor(dst, ifp)) { 157116119bbfSmpi rt = nd6_lookup(&dst->sin6_addr, 1, ifp, 157216119bbfSmpi ifp->if_rdomain); 157316119bbfSmpi if (rt != NULL) { 157416119bbfSmpi created = 1; 1575287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1576287546eaSitojun } 157716119bbfSmpi } 157816119bbfSmpi } 1579287546eaSitojun if (!ln || !rt) { 1580cfb6b8dfSitojun if ((ifp->if_flags & IFF_POINTOPOINT) == 0 && 1581d6b9e9b9Sitojun !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) { 1582bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 1583bbcf0337Smpi 158435075f95Smpi log(LOG_DEBUG, "%s: can't allocate llinfo for %s " 158535075f95Smpi "(ln=%p, rt=%p)\n", __func__, 1586bbcf0337Smpi inet_ntop(AF_INET6, &dst->sin6_addr, 1587bbcf0337Smpi addr, sizeof(addr)), 1588bbcf0337Smpi ln, rt); 158916119bbfSmpi m_freem(m); 159016119bbfSmpi if (created) 159116119bbfSmpi rtfree(rt); 159216119bbfSmpi return (EIO); /* XXX: good error? */ 1593287546eaSitojun } 1594287546eaSitojun 1595cfb6b8dfSitojun goto sendpkt; /* send anyway */ 1596cfb6b8dfSitojun } 1597cfb6b8dfSitojun 1598f3fcf2f3Smcbride /* 1599f3fcf2f3Smcbride * Move this entry to the head of the queue so that it is less likely 1600f3fcf2f3Smcbride * for this entry to be a target of forced garbage collection (see 1601f3fcf2f3Smcbride * nd6_rtrequest()). 1602f3fcf2f3Smcbride */ 1603f3fcf2f3Smcbride LN_DEQUEUE(ln); 1604f3fcf2f3Smcbride LN_INSERTHEAD(ln); 1605f3fcf2f3Smcbride 1606d374aaacSitojun /* We don't have to do link-layer address resolution on a p2p link. */ 1607d374aaacSitojun if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1608be4e9e12Sitojun ln->ln_state < ND6_LLINFO_REACHABLE) { 1609d374aaacSitojun ln->ln_state = ND6_LLINFO_STALE; 16109631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 1611be4e9e12Sitojun } 1612287546eaSitojun 1613287546eaSitojun /* 1614287546eaSitojun * The first time we send a packet to a neighbor whose entry is 1615287546eaSitojun * STALE, we have to change the state to DELAY and a sets a timer to 1616287546eaSitojun * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do 1617287546eaSitojun * neighbor unreachability detection on expiration. 1618287546eaSitojun * (RFC 2461 7.3.3) 1619287546eaSitojun */ 1620287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 1621287546eaSitojun ln->ln_asked = 0; 1622287546eaSitojun ln->ln_state = ND6_LLINFO_DELAY; 16239631a17bSitojun nd6_llinfo_settimer(ln, nd6_delay * hz); 1624287546eaSitojun } 1625287546eaSitojun 1626287546eaSitojun /* 1627287546eaSitojun * If the neighbor cache entry has a state other than INCOMPLETE 162834deef1eSitojun * (i.e. its link-layer address is already resolved), just 1629287546eaSitojun * send the packet. 1630287546eaSitojun */ 1631287546eaSitojun if (ln->ln_state > ND6_LLINFO_INCOMPLETE) 1632287546eaSitojun goto sendpkt; 1633287546eaSitojun 1634287546eaSitojun /* 1635287546eaSitojun * There is a neighbor cache entry, but no ethernet address 1636287546eaSitojun * response yet. Replace the held mbuf (if any) with this 1637287546eaSitojun * latest one. 1638287546eaSitojun */ 1639efcf292bSitojun if (ln->ln_state == ND6_LLINFO_NOSTATE) 1640287546eaSitojun ln->ln_state = ND6_LLINFO_INCOMPLETE; 1641287546eaSitojun m_freem(ln->ln_hold); 1642287546eaSitojun ln->ln_hold = m; 164376843262Sitojun /* 164476843262Sitojun * If there has been no NS for the neighbor after entering the 164576843262Sitojun * INCOMPLETE state, send the first solicitation. 164676843262Sitojun */ 16479631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln) && ln->ln_asked == 0) { 1648287546eaSitojun ln->ln_asked++; 16499631a17bSitojun nd6_llinfo_settimer(ln, 16509631a17bSitojun (long)ND_IFINFO(ifp)->retrans * hz / 1000); 1651287546eaSitojun nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 1652287546eaSitojun } 165316119bbfSmpi if (created) 165416119bbfSmpi rtfree(rt); 1655287546eaSitojun return (0); 1656287546eaSitojun 1657287546eaSitojun sendpkt: 165816119bbfSmpi error = ifp->if_output(ifp, m, sin6tosa(dst), rt); 165916119bbfSmpi if (created) 166016119bbfSmpi rtfree(rt); 1661287546eaSitojun return (error); 1662287546eaSitojun } 1663287546eaSitojun 1664287546eaSitojun int 1665ee37ea65Smcbride nd6_need_cache(struct ifnet *ifp) 1666d8a7e3a7Sitojun { 1667d8a7e3a7Sitojun /* 1668d8a7e3a7Sitojun * RFC2893 says: 1669d8a7e3a7Sitojun * - unidirectional tunnels needs no ND 1670d8a7e3a7Sitojun */ 1671d8a7e3a7Sitojun switch (ifp->if_type) { 1672d8a7e3a7Sitojun case IFT_ETHER: 1673d8a7e3a7Sitojun case IFT_IEEE1394: 1674d8a7e3a7Sitojun case IFT_PROPVIRTUAL: 1675d8a7e3a7Sitojun case IFT_IEEE80211: 1676f4433d56Shenning case IFT_CARP: 1677d8a7e3a7Sitojun case IFT_GIF: /* XXX need more cases? */ 1678d8a7e3a7Sitojun return (1); 1679d8a7e3a7Sitojun default: 1680d8a7e3a7Sitojun return (0); 1681d8a7e3a7Sitojun } 1682d8a7e3a7Sitojun } 1683d8a7e3a7Sitojun 1684d8a7e3a7Sitojun int 16858c023157Smpi nd6_storelladdr(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m, 1686ee37ea65Smcbride struct sockaddr *dst, u_char *desten) 1687287546eaSitojun { 1688287546eaSitojun struct sockaddr_dl *sdl; 16898c023157Smpi struct rtentry *rt; 16908c023157Smpi int error; 1691287546eaSitojun 1692287546eaSitojun if (m->m_flags & M_MCAST) { 1693287546eaSitojun switch (ifp->if_type) { 1694287546eaSitojun case IFT_ETHER: 169565d1c24fSmpi case IFT_CARP: 1696c3c56496Sbluhm ETHER_MAP_IPV6_MULTICAST(&satosin6(dst)->sin6_addr, 1697287546eaSitojun desten); 16988c023157Smpi return (0); 1699287546eaSitojun break; 1700287546eaSitojun default: 17010a2c5741Sitojun m_freem(m); 17028c023157Smpi return (EINVAL); 1703287546eaSitojun } 1704287546eaSitojun } 1705287546eaSitojun 17068c023157Smpi if (rt0 == NULL) { 170772e30262Sitojun /* this could happen, if we could not allocate memory */ 17080a2c5741Sitojun m_freem(m); 17098c023157Smpi return (ENOMEM); 171072e30262Sitojun } 17118c023157Smpi 17128c023157Smpi error = rt_checkgate(ifp, rt0, dst, m->m_pkthdr.ph_rtableid, &rt); 17138c023157Smpi if (error) { 17148c023157Smpi m_freem(m); 17158c023157Smpi return (error); 17168c023157Smpi } 17178c023157Smpi 171872e30262Sitojun if (rt->rt_gateway->sa_family != AF_LINK) { 171935075f95Smpi printf("%s: something odd happens\n", __func__); 17200a2c5741Sitojun m_freem(m); 17218c023157Smpi return (EINVAL); 1722287546eaSitojun } 1723c7b7b779Sbluhm sdl = satosdl(rt->rt_gateway); 1724dbae7f73Smpi if (sdl->sdl_alen != ETHER_ADDR_LEN) { 1725bbcf0337Smpi char addr[INET6_ADDRSTRLEN]; 1726dbae7f73Smpi log(LOG_DEBUG, "%s: %s: incorrect nd6 information\n", __func__, 1727bbcf0337Smpi inet_ntop(AF_INET6, &satosin6(dst)->sin6_addr, 1728dbae7f73Smpi addr, sizeof(addr))); 17290a2c5741Sitojun m_freem(m); 17308c023157Smpi return (EINVAL); 1731b4ee66fcSitojun } 1732287546eaSitojun 1733b4ee66fcSitojun bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 17348c023157Smpi return (0); 1735287546eaSitojun } 1736d8a7e3a7Sitojun 1737ee37ea65Smcbride /* 1738ee37ea65Smcbride * oldp - syscall arg, need copyout 1739ee37ea65Smcbride * newp - syscall arg, need copyin 1740ee37ea65Smcbride */ 1741ee37ea65Smcbride 1742d8a7e3a7Sitojun int 1743a0aa363cSjsing nd6_sysctl(int name, void *oldp, size_t *oldlenp, void *newp, size_t newlen) 1744d8a7e3a7Sitojun { 1745db3db419Sitojun void *p; 174634223ca4Schl size_t ol; 1747d8a7e3a7Sitojun int error; 1748d8a7e3a7Sitojun 1749d8a7e3a7Sitojun error = 0; 1750d8a7e3a7Sitojun 1751d8a7e3a7Sitojun if (newp) 1752d8a7e3a7Sitojun return EPERM; 1753d8a7e3a7Sitojun if (oldp && !oldlenp) 1754d8a7e3a7Sitojun return EINVAL; 1755d8a7e3a7Sitojun ol = oldlenp ? *oldlenp : 0; 1756d8a7e3a7Sitojun 1757db3db419Sitojun if (oldp) { 1758e6ca3d0dSmk p = malloc(*oldlenp, M_TEMP, M_WAITOK | M_CANFAIL); 1759db3db419Sitojun if (!p) 1760db3db419Sitojun return ENOMEM; 1761db3db419Sitojun } else 1762db3db419Sitojun p = NULL; 1763d8a7e3a7Sitojun switch (name) { 1764d8a7e3a7Sitojun case ICMPV6CTL_ND6_DRLIST: 1765db3db419Sitojun error = fill_drlist(p, oldlenp, ol); 1766db3db419Sitojun if (!error && p && oldp) 1767732568ffSitojun error = copyout(p, oldp, *oldlenp); 1768d8a7e3a7Sitojun break; 1769d8a7e3a7Sitojun 1770d8a7e3a7Sitojun case ICMPV6CTL_ND6_PRLIST: 1771db3db419Sitojun error = fill_prlist(p, oldlenp, ol); 1772db3db419Sitojun if (!error && p && oldp) 1773732568ffSitojun error = copyout(p, oldp, *oldlenp); 1774d8a7e3a7Sitojun break; 1775d8a7e3a7Sitojun 1776d8a7e3a7Sitojun default: 1777d8a7e3a7Sitojun error = ENOPROTOOPT; 1778d8a7e3a7Sitojun break; 1779d8a7e3a7Sitojun } 1780db3db419Sitojun if (p) 1781dd168dc2Stedu free(p, M_TEMP, 0); 1782d8a7e3a7Sitojun 1783d8a7e3a7Sitojun return (error); 1784d8a7e3a7Sitojun } 1785d8a7e3a7Sitojun 1786a0aa363cSjsing int 1787ee37ea65Smcbride fill_drlist(void *oldp, size_t *oldlenp, size_t ol) 1788d8a7e3a7Sitojun { 1789d8a7e3a7Sitojun int error = 0, s; 1790d8a7e3a7Sitojun struct in6_defrouter *d = NULL, *de = NULL; 1791d8a7e3a7Sitojun struct nd_defrouter *dr; 1792d8a7e3a7Sitojun size_t l; 1793d8a7e3a7Sitojun 17946e92dee6Sitojun s = splsoftnet(); 1795d8a7e3a7Sitojun 1796d8a7e3a7Sitojun if (oldp) { 1797d8a7e3a7Sitojun d = (struct in6_defrouter *)oldp; 1798d8a7e3a7Sitojun de = (struct in6_defrouter *)((caddr_t)oldp + *oldlenp); 1799d8a7e3a7Sitojun } 1800d8a7e3a7Sitojun l = 0; 1801d8a7e3a7Sitojun 1802568012e6Sbluhm TAILQ_FOREACH(dr, &nd_defrouter, dr_entry) { 1803d8a7e3a7Sitojun if (oldp && d + 1 <= de) { 1804d8a7e3a7Sitojun bzero(d, sizeof(*d)); 1805d8a7e3a7Sitojun d->rtaddr.sin6_family = AF_INET6; 1806d8a7e3a7Sitojun d->rtaddr.sin6_len = sizeof(struct sockaddr_in6); 18076c8dd0e9Sclaudio in6_recoverscope(&d->rtaddr, &dr->rtaddr); 1808d8a7e3a7Sitojun d->flags = dr->flags; 1809d8a7e3a7Sitojun d->rtlifetime = dr->rtlifetime; 1810d8a7e3a7Sitojun d->expire = dr->expire; 1811d8a7e3a7Sitojun d->if_index = dr->ifp->if_index; 1812d8a7e3a7Sitojun } 1813d8a7e3a7Sitojun 1814d8a7e3a7Sitojun l += sizeof(*d); 1815d8a7e3a7Sitojun if (d) 1816d8a7e3a7Sitojun d++; 1817d8a7e3a7Sitojun } 1818d8a7e3a7Sitojun 1819d8a7e3a7Sitojun if (oldp) { 1820d8a7e3a7Sitojun *oldlenp = l; /* (caddr_t)d - (caddr_t)oldp */ 1821d8a7e3a7Sitojun if (l > ol) 1822d8a7e3a7Sitojun error = ENOMEM; 1823d8a7e3a7Sitojun } else 1824d8a7e3a7Sitojun *oldlenp = l; 1825d8a7e3a7Sitojun 1826d8a7e3a7Sitojun splx(s); 1827d8a7e3a7Sitojun 1828d8a7e3a7Sitojun return (error); 1829d8a7e3a7Sitojun } 1830d8a7e3a7Sitojun 1831a0aa363cSjsing int 1832ee37ea65Smcbride fill_prlist(void *oldp, size_t *oldlenp, size_t ol) 1833d8a7e3a7Sitojun { 1834d8a7e3a7Sitojun int error = 0, s; 1835d8a7e3a7Sitojun struct nd_prefix *pr; 183608247436Snaddy char *p = NULL, *ps = NULL; 183708247436Snaddy char *pe = NULL; 1838d8a7e3a7Sitojun size_t l; 1839d8a7e3a7Sitojun 18406e92dee6Sitojun s = splsoftnet(); 1841d8a7e3a7Sitojun 1842d8a7e3a7Sitojun if (oldp) { 184308247436Snaddy ps = p = (char *)oldp; 184408247436Snaddy pe = (char *)oldp + *oldlenp; 1845d8a7e3a7Sitojun } 1846d8a7e3a7Sitojun l = 0; 1847d8a7e3a7Sitojun 1848545205eaSpyr LIST_FOREACH(pr, &nd_prefix, ndpr_entry) { 1849d8a7e3a7Sitojun u_short advrtrs; 185008247436Snaddy struct sockaddr_in6 sin6; 1851d8a7e3a7Sitojun struct nd_pfxrouter *pfr; 185208247436Snaddy struct in6_prefix pfx; 1853d8a7e3a7Sitojun 185408247436Snaddy if (oldp && p + sizeof(struct in6_prefix) <= pe) { 185508247436Snaddy memset(&pfx, 0, sizeof(pfx)); 185608247436Snaddy ps = p; 1857d8a7e3a7Sitojun 185808247436Snaddy pfx.prefix = pr->ndpr_prefix; 18596c8dd0e9Sclaudio in6_recoverscope(&pfx.prefix, 18606c8dd0e9Sclaudio &pfx.prefix.sin6_addr); 186108247436Snaddy pfx.raflags = pr->ndpr_raf; 186208247436Snaddy pfx.prefixlen = pr->ndpr_plen; 186308247436Snaddy pfx.vltime = pr->ndpr_vltime; 186408247436Snaddy pfx.pltime = pr->ndpr_pltime; 186508247436Snaddy pfx.if_index = pr->ndpr_ifp->if_index; 1866d8a7e3a7Sitojun if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME) 186708247436Snaddy pfx.expire = 0; 1868d8a7e3a7Sitojun else { 1869d8a7e3a7Sitojun time_t maxexpire; 1870d8a7e3a7Sitojun 1871d8a7e3a7Sitojun /* XXX: we assume time_t is signed. */ 187291a535ffSguenther maxexpire = (time_t)~(1ULL << 187391a535ffSguenther ((sizeof(maxexpire) * 8) - 1)); 1874d8a7e3a7Sitojun if (pr->ndpr_vltime < 1875d8a7e3a7Sitojun maxexpire - pr->ndpr_lastupdate) { 187608247436Snaddy pfx.expire = pr->ndpr_lastupdate + 1877d8a7e3a7Sitojun pr->ndpr_vltime; 1878d8a7e3a7Sitojun } else 187908247436Snaddy pfx.expire = maxexpire; 1880d8a7e3a7Sitojun } 188108247436Snaddy pfx.refcnt = pr->ndpr_refcnt; 188208247436Snaddy pfx.flags = pr->ndpr_stateflags; 188308247436Snaddy pfx.origin = PR_ORIG_RA; 188408247436Snaddy 188508247436Snaddy p += sizeof(pfx); l += sizeof(pfx); 188608247436Snaddy 1887d8a7e3a7Sitojun advrtrs = 0; 1888545205eaSpyr LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) { 188908247436Snaddy if (p + sizeof(sin6) > pe) { 1890d8a7e3a7Sitojun advrtrs++; 1891d8a7e3a7Sitojun continue; 1892d8a7e3a7Sitojun } 18939c794535Sbluhm bzero(&sin6, sizeof(sin6)); 189408247436Snaddy sin6.sin6_family = AF_INET6; 189508247436Snaddy sin6.sin6_len = sizeof(struct sockaddr_in6); 18966c8dd0e9Sclaudio in6_recoverscope(&sin6, &pfr->router->rtaddr); 1897d8a7e3a7Sitojun advrtrs++; 189808247436Snaddy memcpy(p, &sin6, sizeof(sin6)); 189908247436Snaddy p += sizeof(sin6); 190008247436Snaddy l += sizeof(sin6); 1901d8a7e3a7Sitojun } 190208247436Snaddy pfx.advrtrs = advrtrs; 190308247436Snaddy memcpy(ps, &pfx, sizeof(pfx)); 1904d8a7e3a7Sitojun } 1905d8a7e3a7Sitojun else { 190608247436Snaddy l += sizeof(pfx); 1907d8a7e3a7Sitojun advrtrs = 0; 190808247436Snaddy LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) { 1909d8a7e3a7Sitojun advrtrs++; 191008247436Snaddy l += sizeof(sin6); 1911d8a7e3a7Sitojun } 191208247436Snaddy } 1913d8a7e3a7Sitojun } 1914d8a7e3a7Sitojun 1915d8a7e3a7Sitojun if (oldp) { 1916d8a7e3a7Sitojun *oldlenp = l; /* (caddr_t)d - (caddr_t)oldp */ 1917d8a7e3a7Sitojun if (l > ol) 1918d8a7e3a7Sitojun error = ENOMEM; 1919d8a7e3a7Sitojun } else 1920d8a7e3a7Sitojun *oldlenp = l; 1921d8a7e3a7Sitojun 1922d8a7e3a7Sitojun splx(s); 1923d8a7e3a7Sitojun 1924d8a7e3a7Sitojun return (error); 1925d8a7e3a7Sitojun } 1926