1*cb24f5e5Sclaudio /* $OpenBSD: nd6.c,v 1.77 2008/05/11 08:13:02 claudio 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> 473c4c637fSangelos #include <dev/rndvar.h> 48287546eaSitojun 49287546eaSitojun #include <net/if.h> 50287546eaSitojun #include <net/if_dl.h> 51287546eaSitojun #include <net/if_types.h> 52d6b9e9b9Sitojun #include <net/if_fddi.h> 53287546eaSitojun #include <net/route.h> 54287546eaSitojun 55287546eaSitojun #include <netinet/in.h> 56287546eaSitojun #include <netinet/if_ether.h> 57cb39d30aSangelos #include <netinet/ip_ipsp.h> 5858aa7d74Sangelos 59287546eaSitojun #include <netinet6/in6_var.h> 60fa86ee14Sitojun #include <netinet/ip6.h> 61287546eaSitojun #include <netinet6/ip6_var.h> 62287546eaSitojun #include <netinet6/nd6.h> 63fa86ee14Sitojun #include <netinet/icmp6.h> 64287546eaSitojun 65287546eaSitojun #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */ 66287546eaSitojun #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */ 67287546eaSitojun 68287546eaSitojun #define SIN6(s) ((struct sockaddr_in6 *)s) 69287546eaSitojun #define SDL(s) ((struct sockaddr_dl *)s) 70287546eaSitojun 71287546eaSitojun /* timer values */ 72287546eaSitojun int nd6_prune = 1; /* walk list every 1 seconds */ 73287546eaSitojun int nd6_delay = 5; /* delay first probe time 5 second */ 74287546eaSitojun int nd6_umaxtries = 3; /* maximum unicast query */ 75287546eaSitojun int nd6_mmaxtries = 3; /* maximum multicast query */ 76287546eaSitojun int nd6_useloopback = 1; /* use loopback interface for local traffic */ 77be4e9e12Sitojun int nd6_gctimer = (60 * 60 * 24); /* 1 day: garbage collection timer */ 78287546eaSitojun 79287546eaSitojun /* preventing too many loops in ND option parsing */ 80287546eaSitojun int nd6_maxndopt = 10; /* max # of ND options allowed */ 81287546eaSitojun 82f6e55599Sitojun int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */ 83f6e55599Sitojun 84b79da24aSitojun #ifdef ND6_DEBUG 85b79da24aSitojun int nd6_debug = 1; 86b79da24aSitojun #else 87b79da24aSitojun int nd6_debug = 0; 88b79da24aSitojun #endif 89b79da24aSitojun 90287546eaSitojun /* for debugging? */ 91287546eaSitojun static int nd6_inuse, nd6_allocated; 92287546eaSitojun 93287546eaSitojun struct llinfo_nd6 llinfo_nd6 = {&llinfo_nd6, &llinfo_nd6}; 94f4f4d166Sitojun struct nd_drhead nd_defrouter; 95287546eaSitojun struct nd_prhead nd_prefix = { 0 }; 96287546eaSitojun 97287546eaSitojun int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL; 98287546eaSitojun static struct sockaddr_in6 all1_sa; 99287546eaSitojun 1001b5f410aSitojun static void nd6_setmtu0(struct ifnet *, struct nd_ifinfo *); 101c4071fd1Smillert static void nd6_slowtimo(void *); 102d8a7e3a7Sitojun static struct llinfo_nd6 *nd6_free(struct rtentry *, int); 1039631a17bSitojun static void nd6_llinfo_timer(void *); 104287546eaSitojun 105b3c1e4c1Sitojun struct timeout nd6_slowtimo_ch; 106b3c1e4c1Sitojun struct timeout nd6_timer_ch; 107b3c1e4c1Sitojun extern struct timeout in6_tmpaddrtimer_ch; 108b3c1e4c1Sitojun 109d8a7e3a7Sitojun static int fill_drlist(void *, size_t *, size_t); 110d8a7e3a7Sitojun static int fill_prlist(void *, size_t *, size_t); 111d8a7e3a7Sitojun 112287546eaSitojun void 113287546eaSitojun nd6_init() 114287546eaSitojun { 115287546eaSitojun static int nd6_init_done = 0; 116287546eaSitojun int i; 117287546eaSitojun 118287546eaSitojun if (nd6_init_done) { 119287546eaSitojun log(LOG_NOTICE, "nd6_init called more than once(ignored)\n"); 120287546eaSitojun return; 121287546eaSitojun } 122287546eaSitojun 123287546eaSitojun all1_sa.sin6_family = AF_INET6; 124287546eaSitojun all1_sa.sin6_len = sizeof(struct sockaddr_in6); 125287546eaSitojun for (i = 0; i < sizeof(all1_sa.sin6_addr); i++) 126287546eaSitojun all1_sa.sin6_addr.s6_addr[i] = 0xff; 127287546eaSitojun 128f4f4d166Sitojun /* initialization of the default router list */ 129f4f4d166Sitojun TAILQ_INIT(&nd_defrouter); 130f4f4d166Sitojun 131287546eaSitojun nd6_init_done = 1; 132287546eaSitojun 133287546eaSitojun /* start timer */ 134b3c1e4c1Sitojun timeout_set(&nd6_slowtimo_ch, nd6_slowtimo, NULL); 135b3c1e4c1Sitojun timeout_add(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz); 136287546eaSitojun } 137287546eaSitojun 138d6b9e9b9Sitojun struct nd_ifinfo * 139287546eaSitojun nd6_ifattach(ifp) 140287546eaSitojun struct ifnet *ifp; 141287546eaSitojun { 142d6b9e9b9Sitojun struct nd_ifinfo *nd; 143287546eaSitojun 144393af863Skrw nd = malloc(sizeof(*nd), M_IP6NDP, M_WAITOK | M_ZERO); 145287546eaSitojun 146d6b9e9b9Sitojun nd->initialized = 1; 147287546eaSitojun 148d6b9e9b9Sitojun nd->chlim = IPV6_DEFHLIM; 149d6b9e9b9Sitojun nd->basereachable = REACHABLE_TIME; 150d6b9e9b9Sitojun nd->reachable = ND_COMPUTE_RTIME(nd->basereachable); 151d6b9e9b9Sitojun nd->retrans = RETRANS_TIMER; 152d8a7e3a7Sitojun /* 153d8a7e3a7Sitojun * Note that the default value of ip6_accept_rtadv is 0, which means 154d8a7e3a7Sitojun * we won't accept RAs by default even if we set ND6_IFF_ACCEPT_RTADV 155d8a7e3a7Sitojun * here. 156d8a7e3a7Sitojun */ 157d8a7e3a7Sitojun nd->flags = (ND6_IFF_PERFORMNUD | ND6_IFF_ACCEPT_RTADV); 1581b5f410aSitojun 1591b5f410aSitojun /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */ 1601b5f410aSitojun nd6_setmtu0(ifp, nd); 161d6b9e9b9Sitojun 162d6b9e9b9Sitojun return nd; 163287546eaSitojun } 164287546eaSitojun 165d6b9e9b9Sitojun void 166d6b9e9b9Sitojun nd6_ifdetach(nd) 167d6b9e9b9Sitojun struct nd_ifinfo *nd; 168d6b9e9b9Sitojun { 169d374aaacSitojun 170d6b9e9b9Sitojun free(nd, M_IP6NDP); 171287546eaSitojun } 172287546eaSitojun 173287546eaSitojun void 1741b5f410aSitojun nd6_setmtu(ifp) 1751b5f410aSitojun struct ifnet *ifp; 1761b5f410aSitojun { 1771b5f410aSitojun nd6_setmtu0(ifp, ND_IFINFO(ifp)); 1781b5f410aSitojun } 1791b5f410aSitojun 1801b5f410aSitojun void 1811b5f410aSitojun nd6_setmtu0(ifp, ndi) 182287546eaSitojun struct ifnet *ifp; 183d6b9e9b9Sitojun struct nd_ifinfo *ndi; 184287546eaSitojun { 1851b5f410aSitojun u_int32_t omaxmtu; 1861b5f410aSitojun 1871b5f410aSitojun omaxmtu = ndi->maxmtu; 188287546eaSitojun 18940765843Shenning if (ifp->if_type == IFT_FDDI) 190d6b9e9b9Sitojun ndi->maxmtu = MIN(FDDIMTU, ifp->if_mtu); 19140765843Shenning else 192287546eaSitojun ndi->maxmtu = ifp->if_mtu; 193287546eaSitojun 1941b5f410aSitojun /* 1951b5f410aSitojun * Decreasing the interface MTU under IPV6 minimum MTU may cause 1961b5f410aSitojun * undesirable situation. We thus notify the operator of the change 1971b5f410aSitojun * explicitly. The check for omaxmtu is necessary to restrict the 1981b5f410aSitojun * log to the case of changing the MTU, not initializing it. 1991b5f410aSitojun */ 2001b5f410aSitojun if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) { 2011b5f410aSitojun log(LOG_NOTICE, "nd6_setmtu0: " 2021b5f410aSitojun "new link MTU on %s (%lu) is too small for IPv6\n", 2031b5f410aSitojun ifp->if_xname, (unsigned long)ndi->maxmtu); 204287546eaSitojun } 205d6b9e9b9Sitojun 206d6b9e9b9Sitojun if (ndi->maxmtu > in6_maxmtu) 207d6b9e9b9Sitojun in6_setmaxmtu(); /* check all interfaces just in case */ 208287546eaSitojun } 209287546eaSitojun 210287546eaSitojun void 211287546eaSitojun nd6_option_init(opt, icmp6len, ndopts) 212287546eaSitojun void *opt; 213287546eaSitojun int icmp6len; 214287546eaSitojun union nd_opts *ndopts; 215287546eaSitojun { 216d6b9e9b9Sitojun 217287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 218287546eaSitojun ndopts->nd_opts_search = (struct nd_opt_hdr *)opt; 219287546eaSitojun ndopts->nd_opts_last 220287546eaSitojun = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len); 221287546eaSitojun 222287546eaSitojun if (icmp6len == 0) { 223287546eaSitojun ndopts->nd_opts_done = 1; 224287546eaSitojun ndopts->nd_opts_search = NULL; 225287546eaSitojun } 226287546eaSitojun } 227287546eaSitojun 228287546eaSitojun /* 229287546eaSitojun * Take one ND option. 230287546eaSitojun */ 231287546eaSitojun struct nd_opt_hdr * 232287546eaSitojun nd6_option(ndopts) 233287546eaSitojun union nd_opts *ndopts; 234287546eaSitojun { 235287546eaSitojun struct nd_opt_hdr *nd_opt; 236287546eaSitojun int olen; 237287546eaSitojun 238287546eaSitojun if (!ndopts) 239bc84bce2Skrw panic("ndopts == NULL in nd6_option"); 240287546eaSitojun if (!ndopts->nd_opts_last) 241bc84bce2Skrw panic("uninitialized ndopts in nd6_option"); 242287546eaSitojun if (!ndopts->nd_opts_search) 243287546eaSitojun return NULL; 244287546eaSitojun if (ndopts->nd_opts_done) 245287546eaSitojun return NULL; 246287546eaSitojun 247287546eaSitojun nd_opt = ndopts->nd_opts_search; 248287546eaSitojun 24915bd77d2Sitojun /* make sure nd_opt_len is inside the buffer */ 25015bd77d2Sitojun if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) { 25115bd77d2Sitojun bzero(ndopts, sizeof(*ndopts)); 25215bd77d2Sitojun return NULL; 25315bd77d2Sitojun } 25415bd77d2Sitojun 255287546eaSitojun olen = nd_opt->nd_opt_len << 3; 256287546eaSitojun if (olen == 0) { 257287546eaSitojun /* 258287546eaSitojun * Message validation requires that all included 259287546eaSitojun * options have a length that is greater than zero. 260287546eaSitojun */ 261287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 262287546eaSitojun return NULL; 263287546eaSitojun } 264287546eaSitojun 265287546eaSitojun ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen); 26615bd77d2Sitojun if (ndopts->nd_opts_search > ndopts->nd_opts_last) { 26715bd77d2Sitojun /* option overruns the end of buffer, invalid */ 26815bd77d2Sitojun bzero(ndopts, sizeof(*ndopts)); 26915bd77d2Sitojun return NULL; 27015bd77d2Sitojun } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) { 27115bd77d2Sitojun /* reached the end of options chain */ 272287546eaSitojun ndopts->nd_opts_done = 1; 273287546eaSitojun ndopts->nd_opts_search = NULL; 274287546eaSitojun } 275287546eaSitojun return nd_opt; 276287546eaSitojun } 277287546eaSitojun 278287546eaSitojun /* 279287546eaSitojun * Parse multiple ND options. 280287546eaSitojun * This function is much easier to use, for ND routines that do not need 281287546eaSitojun * multiple options of the same type. 282287546eaSitojun */ 283287546eaSitojun int 284287546eaSitojun nd6_options(ndopts) 285287546eaSitojun union nd_opts *ndopts; 286287546eaSitojun { 287287546eaSitojun struct nd_opt_hdr *nd_opt; 288287546eaSitojun int i = 0; 289287546eaSitojun 290287546eaSitojun if (!ndopts) 291bc84bce2Skrw panic("ndopts == NULL in nd6_options"); 292287546eaSitojun if (!ndopts->nd_opts_last) 293bc84bce2Skrw panic("uninitialized ndopts in nd6_options"); 294287546eaSitojun if (!ndopts->nd_opts_search) 295287546eaSitojun return 0; 296287546eaSitojun 297287546eaSitojun while (1) { 298287546eaSitojun nd_opt = nd6_option(ndopts); 299287546eaSitojun if (!nd_opt && !ndopts->nd_opts_last) { 300287546eaSitojun /* 301287546eaSitojun * Message validation requires that all included 302287546eaSitojun * options have a length that is greater than zero. 303287546eaSitojun */ 304b79da24aSitojun icmp6stat.icp6s_nd_badopt++; 305287546eaSitojun bzero(ndopts, sizeof(*ndopts)); 306287546eaSitojun return -1; 307287546eaSitojun } 308287546eaSitojun 309287546eaSitojun if (!nd_opt) 310287546eaSitojun goto skip1; 311287546eaSitojun 312287546eaSitojun switch (nd_opt->nd_opt_type) { 313287546eaSitojun case ND_OPT_SOURCE_LINKADDR: 314287546eaSitojun case ND_OPT_TARGET_LINKADDR: 315287546eaSitojun case ND_OPT_MTU: 316287546eaSitojun case ND_OPT_REDIRECTED_HEADER: 317287546eaSitojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { 31815bd77d2Sitojun nd6log((LOG_INFO, 31915bd77d2Sitojun "duplicated ND6 option found (type=%d)\n", 32015bd77d2Sitojun nd_opt->nd_opt_type)); 321287546eaSitojun /* XXX bark? */ 322287546eaSitojun } else { 323287546eaSitojun ndopts->nd_opt_array[nd_opt->nd_opt_type] 324287546eaSitojun = nd_opt; 325287546eaSitojun } 326287546eaSitojun break; 327287546eaSitojun case ND_OPT_PREFIX_INFORMATION: 328287546eaSitojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) { 329287546eaSitojun ndopts->nd_opt_array[nd_opt->nd_opt_type] 330287546eaSitojun = nd_opt; 331287546eaSitojun } 332287546eaSitojun ndopts->nd_opts_pi_end = 333287546eaSitojun (struct nd_opt_prefix_info *)nd_opt; 334287546eaSitojun break; 335287546eaSitojun default: 336287546eaSitojun /* 337287546eaSitojun * Unknown options must be silently ignored, 338e4d25771Stodd * to accommodate future extension to the protocol. 339287546eaSitojun */ 340b79da24aSitojun nd6log((LOG_DEBUG, 341287546eaSitojun "nd6_options: unsupported option %d - " 342b79da24aSitojun "option ignored\n", nd_opt->nd_opt_type)); 343287546eaSitojun } 344287546eaSitojun 345287546eaSitojun skip1: 346287546eaSitojun i++; 347287546eaSitojun if (i > nd6_maxndopt) { 348287546eaSitojun icmp6stat.icp6s_nd_toomanyopt++; 349b79da24aSitojun nd6log((LOG_INFO, "too many loop in nd opt\n")); 350287546eaSitojun break; 351287546eaSitojun } 352287546eaSitojun 353287546eaSitojun if (ndopts->nd_opts_done) 354287546eaSitojun break; 355287546eaSitojun } 356287546eaSitojun 357287546eaSitojun return 0; 358287546eaSitojun } 359287546eaSitojun 360287546eaSitojun /* 3619631a17bSitojun * ND6 timer routine to handle ND6 entries 362287546eaSitojun */ 363287546eaSitojun void 3649631a17bSitojun nd6_llinfo_settimer(struct llinfo_nd6 *ln, long tick) 3659631a17bSitojun { 3669631a17bSitojun int s; 3679631a17bSitojun 3689631a17bSitojun s = splsoftnet(); 3699631a17bSitojun 3709631a17bSitojun if (tick < 0) { 3719631a17bSitojun ln->ln_expire = 0; 3729631a17bSitojun ln->ln_ntick = 0; 3739631a17bSitojun timeout_del(&ln->ln_timer_ch); 3749631a17bSitojun } else { 3753212dc31Stholo ln->ln_expire = time_second + tick / hz; 3769631a17bSitojun if (tick > INT_MAX) { 3779631a17bSitojun ln->ln_ntick = tick - INT_MAX; 3789631a17bSitojun timeout_add(&ln->ln_timer_ch, INT_MAX); 3799631a17bSitojun } else { 3809631a17bSitojun ln->ln_ntick = 0; 3819631a17bSitojun timeout_add(&ln->ln_timer_ch, tick); 3829631a17bSitojun } 3839631a17bSitojun } 3849631a17bSitojun 3859631a17bSitojun splx(s); 3869631a17bSitojun } 3879631a17bSitojun 3889631a17bSitojun static void 3899631a17bSitojun nd6_llinfo_timer(void *arg) 390287546eaSitojun { 391287546eaSitojun int s; 392b3c1e4c1Sitojun struct llinfo_nd6 *ln; 393287546eaSitojun struct rtentry *rt; 394287546eaSitojun struct sockaddr_in6 *dst; 3959631a17bSitojun struct ifnet *ifp; 396d374aaacSitojun struct nd_ifinfo *ndi = NULL; 397287546eaSitojun 3989631a17bSitojun s = splsoftnet(); 3999631a17bSitojun 4009631a17bSitojun ln = (struct llinfo_nd6 *)arg; 4019631a17bSitojun 4029631a17bSitojun if (ln->ln_ntick > 0) { 4039631a17bSitojun if (ln->ln_ntick > INT_MAX) { 4049631a17bSitojun ln->ln_ntick -= INT_MAX; 4059631a17bSitojun nd6_llinfo_settimer(ln, INT_MAX); 4069631a17bSitojun } else { 4079631a17bSitojun ln->ln_ntick = 0; 4089631a17bSitojun nd6_llinfo_settimer(ln, ln->ln_ntick); 409287546eaSitojun } 4109631a17bSitojun splx(s); 4119631a17bSitojun return; 412287546eaSitojun } 4139631a17bSitojun 4149631a17bSitojun if ((rt = ln->ln_rt) == NULL) 4159631a17bSitojun panic("ln->ln_rt == NULL"); 4169631a17bSitojun if ((ifp = rt->rt_ifp) == NULL) 4179631a17bSitojun panic("ln->ln_rt->rt_ifp == NULL"); 418d6b9e9b9Sitojun ndi = ND_IFINFO(ifp); 419287546eaSitojun dst = (struct sockaddr_in6 *)rt_key(rt); 420287546eaSitojun 421287546eaSitojun /* sanity check */ 422d374aaacSitojun if (rt->rt_llinfo && (struct llinfo_nd6 *)rt->rt_llinfo != ln) 423bc84bce2Skrw panic("rt_llinfo(%p) is not equal to ln(%p)", 424d374aaacSitojun rt->rt_llinfo, ln); 425287546eaSitojun if (!dst) 426bc84bce2Skrw panic("dst=0 in nd6_timer(ln=%p)", ln); 427287546eaSitojun 428287546eaSitojun switch (ln->ln_state) { 429287546eaSitojun case ND6_LLINFO_INCOMPLETE: 430287546eaSitojun if (ln->ln_asked < nd6_mmaxtries) { 431287546eaSitojun ln->ln_asked++; 4329631a17bSitojun nd6_llinfo_settimer(ln, (long)ndi->retrans * hz / 1000); 4339631a17bSitojun nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 434287546eaSitojun } else { 435287546eaSitojun struct mbuf *m = ln->ln_hold; 436287546eaSitojun if (m) { 4378294a4dfSitojun ln->ln_hold = NULL; 438287546eaSitojun /* 439d8a7e3a7Sitojun * Fake rcvif to make the ICMP error 440d8a7e3a7Sitojun * more helpful in diagnosing for the 441d8a7e3a7Sitojun * receiver. 442287546eaSitojun * XXX: should we consider 443287546eaSitojun * older rcvif? 444287546eaSitojun */ 445287546eaSitojun m->m_pkthdr.rcvif = rt->rt_ifp; 446d8a7e3a7Sitojun 447287546eaSitojun icmp6_error(m, ICMP6_DST_UNREACH, 448287546eaSitojun ICMP6_DST_UNREACH_ADDR, 0); 449e212adedSkrw if (ln->ln_hold == m) { 450e212adedSkrw /* m is back in ln_hold. Discard. */ 451e212adedSkrw m_freem(ln->ln_hold); 452e212adedSkrw ln->ln_hold = NULL; 453e212adedSkrw } 454287546eaSitojun } 4559631a17bSitojun (void)nd6_free(rt, 0); 4569631a17bSitojun ln = NULL; 457287546eaSitojun } 458287546eaSitojun break; 459287546eaSitojun case ND6_LLINFO_REACHABLE: 4609631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 461287546eaSitojun ln->ln_state = ND6_LLINFO_STALE; 4629631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 463be4e9e12Sitojun } 464287546eaSitojun break; 465be4e9e12Sitojun 466be4e9e12Sitojun case ND6_LLINFO_STALE: 467be4e9e12Sitojun /* Garbage Collection(RFC 2461 5.3) */ 4689631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 4699631a17bSitojun (void)nd6_free(rt, 1); 4709631a17bSitojun ln = NULL; 4719631a17bSitojun } 472be4e9e12Sitojun break; 473be4e9e12Sitojun 474287546eaSitojun case ND6_LLINFO_DELAY: 475d374aaacSitojun if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) { 476d374aaacSitojun /* We need NUD */ 477287546eaSitojun ln->ln_asked = 1; 478287546eaSitojun ln->ln_state = ND6_LLINFO_PROBE; 4799631a17bSitojun nd6_llinfo_settimer(ln, (long)ndi->retrans * hz / 1000); 480d374aaacSitojun nd6_ns_output(ifp, &dst->sin6_addr, 481d8a7e3a7Sitojun &dst->sin6_addr, ln, 0); 482be4e9e12Sitojun } else { 483d374aaacSitojun ln->ln_state = ND6_LLINFO_STALE; /* XXX */ 4849631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 485be4e9e12Sitojun } 486287546eaSitojun break; 487287546eaSitojun case ND6_LLINFO_PROBE: 488287546eaSitojun if (ln->ln_asked < nd6_umaxtries) { 489287546eaSitojun ln->ln_asked++; 4909631a17bSitojun nd6_llinfo_settimer(ln, (long)ndi->retrans * hz / 1000); 491287546eaSitojun nd6_ns_output(ifp, &dst->sin6_addr, 492287546eaSitojun &dst->sin6_addr, ln, 0); 493d8a7e3a7Sitojun } else { 4949631a17bSitojun (void)nd6_free(rt, 0); 4959631a17bSitojun ln = NULL; 496d8a7e3a7Sitojun } 497287546eaSitojun break; 498287546eaSitojun } 4999631a17bSitojun 5009631a17bSitojun splx(s); 501287546eaSitojun } 502287546eaSitojun 5039631a17bSitojun /* 5049631a17bSitojun * ND6 timer routine to expire default route list and prefix list 5059631a17bSitojun */ 5069631a17bSitojun void 5079631a17bSitojun nd6_timer(ignored_arg) 5089631a17bSitojun void *ignored_arg; 5099631a17bSitojun { 5109631a17bSitojun int s; 5119631a17bSitojun struct nd_defrouter *dr; 5129631a17bSitojun struct nd_prefix *pr; 5139631a17bSitojun struct in6_ifaddr *ia6, *nia6; 5149631a17bSitojun struct in6_addrlifetime *lt6; 5159631a17bSitojun 5169631a17bSitojun s = splsoftnet(); 5179631a17bSitojun timeout_set(&nd6_timer_ch, nd6_timer, NULL); 5189631a17bSitojun timeout_add(&nd6_timer_ch, nd6_prune * hz); 5199631a17bSitojun 5200a2c5741Sitojun /* expire default router list */ 521f4f4d166Sitojun dr = TAILQ_FIRST(&nd_defrouter); 522287546eaSitojun while (dr) { 5233212dc31Stholo if (dr->expire && dr->expire < time_second) { 524287546eaSitojun struct nd_defrouter *t; 525f4f4d166Sitojun t = TAILQ_NEXT(dr, dr_entry); 526287546eaSitojun defrtrlist_del(dr); 527287546eaSitojun dr = t; 528d8a7e3a7Sitojun } else { 529f4f4d166Sitojun dr = TAILQ_NEXT(dr, dr_entry); 530287546eaSitojun } 531287546eaSitojun } 532287546eaSitojun 533287546eaSitojun /* 534d8a7e3a7Sitojun * expire interface addresses. 535d8a7e3a7Sitojun * in the past the loop was inside prefix expiry processing. 5368b542bbeSpascoe * However, from a stricter spec-conformance standpoint, we should 537d8a7e3a7Sitojun * rather separate address lifetimes and prefix lifetimes. 538d8a7e3a7Sitojun */ 539d8a7e3a7Sitojun for (ia6 = in6_ifaddr; ia6; ia6 = nia6) { 540d8a7e3a7Sitojun nia6 = ia6->ia_next; 541d8a7e3a7Sitojun /* check address lifetime */ 542d8a7e3a7Sitojun lt6 = &ia6->ia6_lifetime; 543d8a7e3a7Sitojun if (IFA6_IS_INVALID(ia6)) { 544d8a7e3a7Sitojun in6_purgeaddr(&ia6->ia_ifa); 5450a8b9475Smarkus } else if (IFA6_IS_DEPRECATED(ia6)) { 546d8a7e3a7Sitojun ia6->ia6_flags |= IN6_IFF_DEPRECATED; 547d8a7e3a7Sitojun } else { 548d8a7e3a7Sitojun /* 549d8a7e3a7Sitojun * A new RA might have made a deprecated address 550d8a7e3a7Sitojun * preferred. 551d8a7e3a7Sitojun */ 552d8a7e3a7Sitojun ia6->ia6_flags &= ~IN6_IFF_DEPRECATED; 553d8a7e3a7Sitojun } 554d8a7e3a7Sitojun } 555d8a7e3a7Sitojun 556d8a7e3a7Sitojun /* expire prefix list */ 557545205eaSpyr pr = LIST_FIRST(&nd_prefix); 558545205eaSpyr while (pr != NULL) { 559d8a7e3a7Sitojun /* 560287546eaSitojun * check prefix lifetime. 561287546eaSitojun * since pltime is just for autoconf, pltime processing for 562287546eaSitojun * prefix is not necessary. 563287546eaSitojun */ 564d8a7e3a7Sitojun if (pr->ndpr_vltime != ND6_INFINITE_LIFETIME && 5653212dc31Stholo time_second - pr->ndpr_lastupdate > pr->ndpr_vltime) { 566287546eaSitojun struct nd_prefix *t; 567545205eaSpyr t = LIST_NEXT(pr, ndpr_entry); 568287546eaSitojun 569287546eaSitojun /* 570287546eaSitojun * address expiration and prefix expiration are 571d8a7e3a7Sitojun * separate. NEVER perform in6_purgeaddr here. 572287546eaSitojun */ 573287546eaSitojun 574287546eaSitojun prelist_remove(pr); 575287546eaSitojun pr = t; 576287546eaSitojun } else 577545205eaSpyr pr = LIST_NEXT(pr, ndpr_entry); 578287546eaSitojun } 579287546eaSitojun splx(s); 580287546eaSitojun } 581287546eaSitojun 58222770369Sitojun /* 58322770369Sitojun * Nuke neighbor cache/prefix/default router management table, right before 58422770369Sitojun * ifp goes away. 58522770369Sitojun */ 58622770369Sitojun void 58722770369Sitojun nd6_purge(ifp) 58822770369Sitojun struct ifnet *ifp; 58922770369Sitojun { 59022770369Sitojun struct llinfo_nd6 *ln, *nln; 591d8a7e3a7Sitojun struct nd_defrouter *dr, *ndr; 59222770369Sitojun struct nd_prefix *pr, *npr; 59322770369Sitojun 59422770369Sitojun /* 595d8a7e3a7Sitojun * Nuke default router list entries toward ifp. 596d8a7e3a7Sitojun * We defer removal of default router list entries that is installed 597d8a7e3a7Sitojun * in the routing table, in order to keep additional side effects as 598d8a7e3a7Sitojun * small as possible. 59922770369Sitojun */ 600d8a7e3a7Sitojun for (dr = TAILQ_FIRST(&nd_defrouter); dr; dr = ndr) { 601f4f4d166Sitojun ndr = TAILQ_NEXT(dr, dr_entry); 602d8a7e3a7Sitojun if (dr->installed) 603d8a7e3a7Sitojun continue; 604d8a7e3a7Sitojun 60522770369Sitojun if (dr->ifp == ifp) 60622770369Sitojun defrtrlist_del(dr); 60722770369Sitojun } 608d8a7e3a7Sitojun for (dr = TAILQ_FIRST(&nd_defrouter); dr; dr = ndr) { 609d8a7e3a7Sitojun ndr = TAILQ_NEXT(dr, dr_entry); 610d8a7e3a7Sitojun if (!dr->installed) 611d8a7e3a7Sitojun continue; 612d8a7e3a7Sitojun 61322770369Sitojun if (dr->ifp == ifp) 61422770369Sitojun defrtrlist_del(dr); 61522770369Sitojun } 61622770369Sitojun 61722770369Sitojun /* Nuke prefix list entries toward ifp */ 618545205eaSpyr for (pr = LIST_FIRST(&nd_prefix); pr != NULL; pr = npr) { 619545205eaSpyr npr = LIST_NEXT(pr, ndpr_entry); 62022770369Sitojun if (pr->ndpr_ifp == ifp) { 621d8a7e3a7Sitojun /* 62208abfc37Sbrad * Because if_detach() does *not* release prefixes 62308abfc37Sbrad * while purging addresses the reference count will 62408abfc37Sbrad * still be above zero. We therefore reset it to 62508abfc37Sbrad * make sure that the prefix really gets purged. 62608abfc37Sbrad */ 62708abfc37Sbrad pr->ndpr_refcnt = 0; 62808abfc37Sbrad /* 629d8a7e3a7Sitojun * Previously, pr->ndpr_addr is removed as well, 630d8a7e3a7Sitojun * but I strongly believe we don't have to do it. 631d8a7e3a7Sitojun * nd6_purge() is only called from in6_ifdetach(), 632d8a7e3a7Sitojun * which removes all the associated interface addresses 633d8a7e3a7Sitojun * by itself. 634d8a7e3a7Sitojun * (jinmei@kame.net 20010129) 635d8a7e3a7Sitojun */ 63622770369Sitojun prelist_remove(pr); 63722770369Sitojun } 63822770369Sitojun } 63922770369Sitojun 640f4f4d166Sitojun /* cancel default outgoing interface setting */ 641f4f4d166Sitojun if (nd6_defifindex == ifp->if_index) 642f4f4d166Sitojun nd6_setdefaultiface(0); 643f4f4d166Sitojun 644e6e438a4Sitojun if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */ 64522770369Sitojun /* refresh default router list */ 646f4f4d166Sitojun defrouter_select(); 647e6e438a4Sitojun } 64822770369Sitojun 64922770369Sitojun /* 65022770369Sitojun * Nuke neighbor cache entries for the ifp. 65122770369Sitojun * Note that rt->rt_ifp may not be the same as ifp, 65222770369Sitojun * due to KAME goto ours hack. See RTM_RESOLVE case in 65322770369Sitojun * nd6_rtrequest(), and ip6_input(). 65422770369Sitojun */ 65522770369Sitojun ln = llinfo_nd6.ln_next; 65622770369Sitojun while (ln && ln != &llinfo_nd6) { 65722770369Sitojun struct rtentry *rt; 65822770369Sitojun struct sockaddr_dl *sdl; 65922770369Sitojun 66022770369Sitojun nln = ln->ln_next; 66122770369Sitojun rt = ln->ln_rt; 66222770369Sitojun if (rt && rt->rt_gateway && 66322770369Sitojun rt->rt_gateway->sa_family == AF_LINK) { 66422770369Sitojun sdl = (struct sockaddr_dl *)rt->rt_gateway; 66522770369Sitojun if (sdl->sdl_index == ifp->if_index) 666d8a7e3a7Sitojun nln = nd6_free(rt, 0); 66722770369Sitojun } 66822770369Sitojun ln = nln; 66922770369Sitojun } 67022770369Sitojun } 67122770369Sitojun 672287546eaSitojun struct rtentry * 673287546eaSitojun nd6_lookup(addr6, create, ifp) 674287546eaSitojun struct in6_addr *addr6; 675287546eaSitojun int create; 676287546eaSitojun struct ifnet *ifp; 677287546eaSitojun { 678287546eaSitojun struct rtentry *rt; 679287546eaSitojun struct sockaddr_in6 sin6; 680287546eaSitojun 681287546eaSitojun bzero(&sin6, sizeof(sin6)); 682287546eaSitojun sin6.sin6_len = sizeof(struct sockaddr_in6); 683287546eaSitojun sin6.sin6_family = AF_INET6; 684287546eaSitojun sin6.sin6_addr = *addr6; 685d8a7e3a7Sitojun 686c241aca8Shenning rt = rtalloc1((struct sockaddr *)&sin6, create, 0); 687287546eaSitojun if (rt && (rt->rt_flags & RTF_LLINFO) == 0) { 688287546eaSitojun /* 689287546eaSitojun * This is the case for the default route. 690287546eaSitojun * If we want to create a neighbor cache for the address, we 691287546eaSitojun * should free the route for the destination and allocate an 692287546eaSitojun * interface route. 693287546eaSitojun */ 694287546eaSitojun if (create) { 695287546eaSitojun RTFREE(rt); 696287546eaSitojun rt = 0; 697287546eaSitojun } 698287546eaSitojun } 699287546eaSitojun if (!rt) { 700287546eaSitojun if (create && ifp) { 701*cb24f5e5Sclaudio struct rt_addrinfo info; 702d374aaacSitojun int e; 703d374aaacSitojun 704287546eaSitojun /* 705287546eaSitojun * If no route is available and create is set, 706287546eaSitojun * we allocate a host route for the destination 707287546eaSitojun * and treat it like an interface route. 708287546eaSitojun * This hack is necessary for a neighbor which can't 709287546eaSitojun * be covered by our own prefix. 710287546eaSitojun */ 711287546eaSitojun struct ifaddr *ifa = 712287546eaSitojun ifaof_ifpforaddr((struct sockaddr *)&sin6, ifp); 713287546eaSitojun if (ifa == NULL) 714287546eaSitojun return (NULL); 715287546eaSitojun 716287546eaSitojun /* 717287546eaSitojun * Create a new route. RTF_LLINFO is necessary 718287546eaSitojun * to create a Neighbor Cache entry for the 719287546eaSitojun * destination in nd6_rtrequest which will be 720*cb24f5e5Sclaudio * called in rtrequest1 via ifa->ifa_rtrequest. 721287546eaSitojun */ 722*cb24f5e5Sclaudio bzero(&info, sizeof(info)); 723*cb24f5e5Sclaudio info.rti_flags = (ifa->ifa_flags | RTF_HOST | 724*cb24f5e5Sclaudio RTF_LLINFO) & ~RTF_CLONING; 725*cb24f5e5Sclaudio info.rti_info[RTAX_DST] = (struct sockaddr *)&sin6; 726*cb24f5e5Sclaudio info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; 727*cb24f5e5Sclaudio info.rti_info[RTAX_NETMASK] = 728*cb24f5e5Sclaudio (struct sockaddr *)&all1_sa; 729*cb24f5e5Sclaudio if ((e = rtrequest1(RTM_ADD, &info, RTP_CONNECTED, 730*cb24f5e5Sclaudio &rt, 0)) != 0) { 731d8a7e3a7Sitojun #if 0 732287546eaSitojun log(LOG_ERR, 733287546eaSitojun "nd6_lookup: failed to add route for a " 734d374aaacSitojun "neighbor(%s), errno=%d\n", 735d374aaacSitojun ip6_sprintf(addr6), e); 736d8a7e3a7Sitojun #endif 737d8a7e3a7Sitojun return (NULL); 738d8a7e3a7Sitojun } 739287546eaSitojun if (rt == NULL) 740287546eaSitojun return (NULL); 741287546eaSitojun if (rt->rt_llinfo) { 742287546eaSitojun struct llinfo_nd6 *ln = 743287546eaSitojun (struct llinfo_nd6 *)rt->rt_llinfo; 744287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 745287546eaSitojun } 746f6e55599Sitojun } else 747287546eaSitojun return (NULL); 748287546eaSitojun } 749287546eaSitojun rt->rt_refcnt--; 750287546eaSitojun /* 751287546eaSitojun * Validation for the entry. 752d8a7e3a7Sitojun * Note that the check for rt_llinfo is necessary because a cloned 753d8a7e3a7Sitojun * route from a parent route that has the L flag (e.g. the default 754d8a7e3a7Sitojun * route to a p2p interface) may have the flag, too, while the 755d8a7e3a7Sitojun * destination is not actually a neighbor. 756287546eaSitojun * XXX: we can't use rt->rt_ifp to check for the interface, since 757287546eaSitojun * it might be the loopback interface if the entry is for our 758287546eaSitojun * own address on a non-loopback interface. Instead, we should 759d8a7e3a7Sitojun * use rt->rt_ifa->ifa_ifp, which would specify the REAL 760d8a7e3a7Sitojun * interface. 761287546eaSitojun */ 762287546eaSitojun if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 || 763d8a7e3a7Sitojun rt->rt_gateway->sa_family != AF_LINK || rt->rt_llinfo == NULL || 764287546eaSitojun (ifp && rt->rt_ifa->ifa_ifp != ifp)) { 765287546eaSitojun if (create) { 766da592434Sitojun nd6log((LOG_DEBUG, 767d8a7e3a7Sitojun "nd6_lookup: failed to lookup %s (if = %s)\n", 768da592434Sitojun ip6_sprintf(addr6), 769da592434Sitojun ifp ? ifp->if_xname : "unspec")); 770287546eaSitojun } 771d8a7e3a7Sitojun return (NULL); 772287546eaSitojun } 773287546eaSitojun return (rt); 774287546eaSitojun } 775287546eaSitojun 776287546eaSitojun /* 777287546eaSitojun * Detect if a given IPv6 address identifies a neighbor on a given link. 778287546eaSitojun * XXX: should take care of the destination of a p2p link? 779287546eaSitojun */ 780287546eaSitojun int 781287546eaSitojun nd6_is_addr_neighbor(addr, ifp) 782cfb6b8dfSitojun struct sockaddr_in6 *addr; 783287546eaSitojun struct ifnet *ifp; 784287546eaSitojun { 785d8a7e3a7Sitojun struct nd_prefix *pr; 786d8a7e3a7Sitojun struct rtentry *rt; 787287546eaSitojun 788cfb6b8dfSitojun /* 789cfb6b8dfSitojun * A link-local address is always a neighbor. 790cfb6b8dfSitojun * XXX: we should use the sin6_scope_id field rather than the embedded 791cfb6b8dfSitojun * interface index. 792d8a7e3a7Sitojun * XXX: a link does not necessarily specify a single interface. 793cfb6b8dfSitojun */ 794cfb6b8dfSitojun if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) && 795cfb6b8dfSitojun ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index) 796287546eaSitojun return (1); 797287546eaSitojun 798287546eaSitojun /* 799d8a7e3a7Sitojun * If the address matches one of our on-link prefixes, it should be a 800d8a7e3a7Sitojun * neighbor. 801287546eaSitojun */ 802545205eaSpyr LIST_FOREACH(pr, &nd_prefix, ndpr_entry) { 803d8a7e3a7Sitojun if (pr->ndpr_ifp != ifp) 804d8a7e3a7Sitojun continue; 805287546eaSitojun 806d8a7e3a7Sitojun if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) 807d8a7e3a7Sitojun continue; 808d8a7e3a7Sitojun 809d8a7e3a7Sitojun if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr, 810d8a7e3a7Sitojun &addr->sin6_addr, &pr->ndpr_mask)) 811d8a7e3a7Sitojun return (1); 812287546eaSitojun } 813d8a7e3a7Sitojun 814d8a7e3a7Sitojun /* 815d8a7e3a7Sitojun * If the default router list is empty, all addresses are regarded 816d8a7e3a7Sitojun * as on-link, and thus, as a neighbor. 817d8a7e3a7Sitojun * XXX: we restrict the condition to hosts, because routers usually do 818d8a7e3a7Sitojun * not have the "default router list". 819d8a7e3a7Sitojun */ 820d8a7e3a7Sitojun if (!ip6_forwarding && TAILQ_FIRST(&nd_defrouter) == NULL && 821d8a7e3a7Sitojun nd6_defifindex == ifp->if_index) { 822287546eaSitojun return (1); 823287546eaSitojun } 824287546eaSitojun 825287546eaSitojun /* 826287546eaSitojun * Even if the address matches none of our addresses, it might be 827287546eaSitojun * in the neighbor cache. 828287546eaSitojun */ 829d8a7e3a7Sitojun if ((rt = nd6_lookup(&addr->sin6_addr, 0, ifp)) != NULL) 830287546eaSitojun return (1); 831287546eaSitojun 832287546eaSitojun return (0); 833287546eaSitojun } 834287546eaSitojun 835287546eaSitojun /* 836287546eaSitojun * Free an nd6 llinfo entry. 837d8a7e3a7Sitojun * Since the function would cause significant changes in the kernel, DO NOT 838d8a7e3a7Sitojun * make it global, unless you have a strong reason for the change, and are sure 839d8a7e3a7Sitojun * that the change is safe. 840287546eaSitojun */ 841d8a7e3a7Sitojun static struct llinfo_nd6 * 842d8a7e3a7Sitojun nd6_free(rt, gc) 843287546eaSitojun struct rtentry *rt; 844d8a7e3a7Sitojun int gc; 845287546eaSitojun { 846*cb24f5e5Sclaudio struct rt_addrinfo info; 84729760ae1Sitojun struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo, *next; 848f4f4d166Sitojun struct in6_addr in6 = ((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 849287546eaSitojun struct nd_defrouter *dr; 850287546eaSitojun 851287546eaSitojun /* 852d8a7e3a7Sitojun * we used to have pfctlinput(PRC_HOSTDEAD) here. 853d8a7e3a7Sitojun * even though it is not harmful, it was not really necessary. 854287546eaSitojun */ 855f4f4d166Sitojun 856492c93a5Sitojun if (!ip6_forwarding) { 857f4f4d166Sitojun int s; 8586e92dee6Sitojun s = splsoftnet(); 859f4f4d166Sitojun dr = defrouter_lookup(&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 860f4f4d166Sitojun rt->rt_ifp); 861d8a7e3a7Sitojun 862d8a7e3a7Sitojun if (dr != NULL && dr->expire && 863d8a7e3a7Sitojun ln->ln_state == ND6_LLINFO_STALE && gc) { 864d8a7e3a7Sitojun /* 865d8a7e3a7Sitojun * If the reason for the deletion is just garbage 866d8a7e3a7Sitojun * collection, and the neighbor is an active default 867d8a7e3a7Sitojun * router, do not delete it. Instead, reset the GC 868d8a7e3a7Sitojun * timer using the router's lifetime. 869d8a7e3a7Sitojun * Simply deleting the entry would affect default 870d8a7e3a7Sitojun * router selection, which is not necessarily a good 871d8a7e3a7Sitojun * thing, especially when we're using router preference 872d8a7e3a7Sitojun * values. 873d8a7e3a7Sitojun * XXX: the check for ln_state would be redundant, 874d8a7e3a7Sitojun * but we intentionally keep it just in case. 875d8a7e3a7Sitojun */ 8763212dc31Stholo if (dr->expire > time_second * hz) { 8779631a17bSitojun nd6_llinfo_settimer(ln, 8783212dc31Stholo dr->expire - time_second * hz); 8799631a17bSitojun } else 8809631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 881d8a7e3a7Sitojun splx(s); 882d8a7e3a7Sitojun return (ln->ln_next); 883d8a7e3a7Sitojun } 884d8a7e3a7Sitojun 885f4f4d166Sitojun if (ln->ln_router || dr) { 886f4f4d166Sitojun /* 887f4f4d166Sitojun * rt6_flush must be called whether or not the neighbor 888f4f4d166Sitojun * is in the Default Router List. 889f4f4d166Sitojun * See a corresponding comment in nd6_na_input(). 890f4f4d166Sitojun */ 891f4f4d166Sitojun rt6_flush(&in6, rt->rt_ifp); 892f4f4d166Sitojun } 893f4f4d166Sitojun 894f4f4d166Sitojun if (dr) { 895f4f4d166Sitojun /* 8968b542bbeSpascoe * Unreachability of a router might affect the default 897f4f4d166Sitojun * router selection and on-link detection of advertised 898f4f4d166Sitojun * prefixes. 899f4f4d166Sitojun */ 900f4f4d166Sitojun 901f4f4d166Sitojun /* 902f4f4d166Sitojun * Temporarily fake the state to choose a new default 903f4f4d166Sitojun * router and to perform on-link determination of 90434deef1eSitojun * prefixes correctly. 905f4f4d166Sitojun * Below the state will be set correctly, 906f4f4d166Sitojun * or the entry itself will be deleted. 907f4f4d166Sitojun */ 908f4f4d166Sitojun ln->ln_state = ND6_LLINFO_INCOMPLETE; 909f4f4d166Sitojun 910f4f4d166Sitojun /* 911d8a7e3a7Sitojun * Since defrouter_select() does not affect the 912d8a7e3a7Sitojun * on-link determination and MIP6 needs the check 913d8a7e3a7Sitojun * before the default router selection, we perform 914d8a7e3a7Sitojun * the check now. 915f4f4d166Sitojun */ 916f4f4d166Sitojun pfxlist_onlink_check(); 917d8a7e3a7Sitojun 918d8a7e3a7Sitojun /* 919d8a7e3a7Sitojun * refresh default router list 920d8a7e3a7Sitojun */ 921d8a7e3a7Sitojun defrouter_select(); 922287546eaSitojun } 923287546eaSitojun splx(s); 924287546eaSitojun } 925287546eaSitojun 92629760ae1Sitojun /* 92729760ae1Sitojun * Before deleting the entry, remember the next entry as the 92829760ae1Sitojun * return value. We need this because pfxlist_onlink_check() above 92929760ae1Sitojun * might have freed other entries (particularly the old next entry) as 93029760ae1Sitojun * a side effect (XXX). 93129760ae1Sitojun */ 93229760ae1Sitojun next = ln->ln_next; 93329760ae1Sitojun 93429760ae1Sitojun /* 93529760ae1Sitojun * Detach the route from the routing tree and the list of neighbor 93629760ae1Sitojun * caches, and disable the route entry not to be used in already 93729760ae1Sitojun * cached routes. 93829760ae1Sitojun */ 939*cb24f5e5Sclaudio bzero(&info, sizeof(info)); 940*cb24f5e5Sclaudio info.rti_info[RTAX_DST] = rt_key(rt); 941*cb24f5e5Sclaudio info.rti_info[RTAX_NETMASK] = rt_mask(rt); 942*cb24f5e5Sclaudio rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, 0); 94329760ae1Sitojun 9440a2c5741Sitojun return (next); 945287546eaSitojun } 946287546eaSitojun 947287546eaSitojun /* 948287546eaSitojun * Upper-layer reachability hint for Neighbor Unreachability Detection. 949287546eaSitojun * 9508b542bbeSpascoe * XXX cost-effective methods? 951287546eaSitojun */ 952287546eaSitojun void 953f6e55599Sitojun nd6_nud_hint(rt, dst6, force) 954287546eaSitojun struct rtentry *rt; 955287546eaSitojun struct in6_addr *dst6; 956f6e55599Sitojun int force; 957287546eaSitojun { 958287546eaSitojun struct llinfo_nd6 *ln; 959287546eaSitojun 960287546eaSitojun /* 961287546eaSitojun * If the caller specified "rt", use that. Otherwise, resolve the 962287546eaSitojun * routing table by supplied "dst6". 963287546eaSitojun */ 964287546eaSitojun if (!rt) { 965287546eaSitojun if (!dst6) 966287546eaSitojun return; 967287546eaSitojun if (!(rt = nd6_lookup(dst6, 0, NULL))) 968287546eaSitojun return; 969287546eaSitojun } 970287546eaSitojun 971f6e55599Sitojun if ((rt->rt_flags & RTF_GATEWAY) != 0 || 972f6e55599Sitojun (rt->rt_flags & RTF_LLINFO) == 0 || 973f6e55599Sitojun !rt->rt_llinfo || !rt->rt_gateway || 974f6e55599Sitojun rt->rt_gateway->sa_family != AF_LINK) { 975287546eaSitojun /* This is not a host route. */ 976287546eaSitojun return; 977287546eaSitojun } 978287546eaSitojun 979287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 980804d8827Sitojun if (ln->ln_state < ND6_LLINFO_REACHABLE) 981287546eaSitojun return; 982287546eaSitojun 983f6e55599Sitojun /* 984f6e55599Sitojun * if we get upper-layer reachability confirmation many times, 985f6e55599Sitojun * it is possible we have false information. 986f6e55599Sitojun */ 987f6e55599Sitojun if (!force) { 988f6e55599Sitojun ln->ln_byhint++; 989f6e55599Sitojun if (ln->ln_byhint > nd6_maxnudhint) 990f6e55599Sitojun return; 991f6e55599Sitojun } 992f6e55599Sitojun 993287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 9949631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln)) { 9959631a17bSitojun nd6_llinfo_settimer(ln, 9969631a17bSitojun (long)ND_IFINFO(rt->rt_ifp)->reachable * hz); 9979631a17bSitojun } 998287546eaSitojun } 999287546eaSitojun 1000287546eaSitojun void 1001afed035cSitojun nd6_rtrequest(req, rt, info) 1002287546eaSitojun int req; 1003287546eaSitojun struct rtentry *rt; 1004afed035cSitojun struct rt_addrinfo *info; /* xxx unused */ 1005287546eaSitojun { 1006287546eaSitojun struct sockaddr *gate = rt->rt_gateway; 1007287546eaSitojun struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1008287546eaSitojun static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1009287546eaSitojun struct ifnet *ifp = rt->rt_ifp; 1010287546eaSitojun struct ifaddr *ifa; 1011d8a7e3a7Sitojun int mine = 0; 1012287546eaSitojun 1013d8a7e3a7Sitojun if ((rt->rt_flags & RTF_GATEWAY) != 0) 1014287546eaSitojun return; 1015287546eaSitojun 1016d8a7e3a7Sitojun if (nd6_need_cache(ifp) == 0 && (rt->rt_flags & RTF_HOST) == 0) { 1017d8a7e3a7Sitojun /* 1018d8a7e3a7Sitojun * This is probably an interface direct route for a link 1019d8a7e3a7Sitojun * which does not need neighbor caches (e.g. fe80::%lo0/64). 1020d8a7e3a7Sitojun * We do not need special treatment below for such a route. 1021d8a7e3a7Sitojun * Moreover, the RTF_LLINFO flag which would be set below 1022d8a7e3a7Sitojun * would annoy the ndp(8) command. 1023d8a7e3a7Sitojun */ 1024d8a7e3a7Sitojun return; 1025d8a7e3a7Sitojun } 1026d8a7e3a7Sitojun 1027d8a7e3a7Sitojun if (req == RTM_RESOLVE && 1028d8a7e3a7Sitojun (nd6_need_cache(ifp) == 0 || /* stf case */ 1029d8a7e3a7Sitojun !nd6_is_addr_neighbor((struct sockaddr_in6 *)rt_key(rt), ifp))) { 1030d8a7e3a7Sitojun /* 1031d8a7e3a7Sitojun * FreeBSD and BSD/OS often make a cloned host route based 1032d8a7e3a7Sitojun * on a less-specific route (e.g. the default route). 1033d8a7e3a7Sitojun * If the less specific route does not have a "gateway" 1034d8a7e3a7Sitojun * (this is the case when the route just goes to a p2p or an 1035d8a7e3a7Sitojun * stf interface), we'll mistakenly make a neighbor cache for 1036d8a7e3a7Sitojun * the host route, and will see strange neighbor solicitation 1037d8a7e3a7Sitojun * for the corresponding destination. In order to avoid the 1038d8a7e3a7Sitojun * confusion, we check if the destination of the route is 1039d8a7e3a7Sitojun * a neighbor in terms of neighbor discovery, and stop the 1040d8a7e3a7Sitojun * process if not. Additionally, we remove the LLINFO flag 1041d8a7e3a7Sitojun * so that ndp(8) will not try to get the neighbor information 1042d8a7e3a7Sitojun * of the destination. 1043d8a7e3a7Sitojun */ 1044d8a7e3a7Sitojun rt->rt_flags &= ~RTF_LLINFO; 1045d8a7e3a7Sitojun return; 1046d8a7e3a7Sitojun } 1047d8a7e3a7Sitojun 1048287546eaSitojun switch (req) { 1049287546eaSitojun case RTM_ADD: 1050287546eaSitojun /* 1051287546eaSitojun * There is no backward compatibility :) 1052287546eaSitojun * 1053287546eaSitojun * if ((rt->rt_flags & RTF_HOST) == 0 && 1054287546eaSitojun * SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) 1055287546eaSitojun * rt->rt_flags |= RTF_CLONING; 1056287546eaSitojun */ 105748ebf8e1Sitojun if ((rt->rt_flags & RTF_CLONING) || 105848ebf8e1Sitojun ((rt->rt_flags & RTF_LLINFO) && !ln)) { 1059287546eaSitojun /* 106048ebf8e1Sitojun * Case 1: This route should come from a route to 106148ebf8e1Sitojun * interface (RTF_CLONING case) or the route should be 106248ebf8e1Sitojun * treated as on-link but is currently not 106348ebf8e1Sitojun * (RTF_LLINFO && !ln case). 1064287546eaSitojun */ 1065287546eaSitojun rt_setgate(rt, rt_key(rt), 1066c241aca8Shenning (struct sockaddr *)&null_sdl, 0); 1067287546eaSitojun gate = rt->rt_gateway; 1068287546eaSitojun SDL(gate)->sdl_type = ifp->if_type; 1069287546eaSitojun SDL(gate)->sdl_index = ifp->if_index; 1070287546eaSitojun if (ln) 10719631a17bSitojun nd6_llinfo_settimer(ln, 0); 1072d8a7e3a7Sitojun if ((rt->rt_flags & RTF_CLONING) != 0) 1073287546eaSitojun break; 1074287546eaSitojun } 1075f4f4d166Sitojun /* 10768b542bbeSpascoe * In IPv4 code, we try to announce new RTF_ANNOUNCE entry here. 1077f4f4d166Sitojun * We don't do that here since llinfo is not ready yet. 1078f4f4d166Sitojun * 1079f4f4d166Sitojun * There are also couple of other things to be discussed: 1080f4f4d166Sitojun * - unsolicited NA code needs improvement beforehand 1081f4f4d166Sitojun * - RFC2461 says we MAY send multicast unsolicited NA 1082f4f4d166Sitojun * (7.2.6 paragraph 4), however, it also says that we 1083f4f4d166Sitojun * SHOULD provide a mechanism to prevent multicast NA storm. 1084f4f4d166Sitojun * we don't have anything like it right now. 1085841d7adbSitojun * note that the mechanism needs a mutual agreement 1086f4f4d166Sitojun * between proxies, which means that we need to implement 1087841d7adbSitojun * a new protocol, or a new kludge. 1088841d7adbSitojun * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA. 1089f4f4d166Sitojun * we need to check ip6forwarding before sending it. 1090f4f4d166Sitojun * (or should we allow proxy ND configuration only for 1091f4f4d166Sitojun * routers? there's no mention about proxy ND from hosts) 1092f4f4d166Sitojun */ 1093f4f4d166Sitojun #if 0 1094f4f4d166Sitojun /* XXX it does not work */ 1095287546eaSitojun if (rt->rt_flags & RTF_ANNOUNCE) 1096287546eaSitojun nd6_na_output(ifp, 1097287546eaSitojun &SIN6(rt_key(rt))->sin6_addr, 1098287546eaSitojun &SIN6(rt_key(rt))->sin6_addr, 1099287546eaSitojun ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, 1100f4f4d166Sitojun 1, NULL); 1101f4f4d166Sitojun #endif 1102287546eaSitojun /* FALLTHROUGH */ 1103287546eaSitojun case RTM_RESOLVE: 1104d8a7e3a7Sitojun if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) { 1105d374aaacSitojun /* 1106d374aaacSitojun * Address resolution isn't necessary for a point to 1107d374aaacSitojun * point link, so we can skip this test for a p2p link. 1108d374aaacSitojun */ 1109287546eaSitojun if (gate->sa_family != AF_LINK || 1110287546eaSitojun gate->sa_len < sizeof(null_sdl)) { 1111d374aaacSitojun log(LOG_DEBUG, 11120a2c5741Sitojun "nd6_rtrequest: bad gateway value: %s\n", 111393036e4eSangelos ifp->if_xname); 1114287546eaSitojun break; 1115287546eaSitojun } 1116287546eaSitojun SDL(gate)->sdl_type = ifp->if_type; 1117287546eaSitojun SDL(gate)->sdl_index = ifp->if_index; 1118d374aaacSitojun } 1119d374aaacSitojun if (ln != NULL) 1120287546eaSitojun break; /* This happens on a route change */ 1121287546eaSitojun /* 1122287546eaSitojun * Case 2: This route may come from cloning, or a manual route 1123287546eaSitojun * add with a LL address. 1124287546eaSitojun */ 1125287546eaSitojun R_Malloc(ln, struct llinfo_nd6 *, sizeof(*ln)); 1126287546eaSitojun rt->rt_llinfo = (caddr_t)ln; 1127287546eaSitojun if (!ln) { 1128287546eaSitojun log(LOG_DEBUG, "nd6_rtrequest: malloc failed\n"); 1129287546eaSitojun break; 1130287546eaSitojun } 1131287546eaSitojun nd6_inuse++; 1132287546eaSitojun nd6_allocated++; 1133287546eaSitojun Bzero(ln, sizeof(*ln)); 1134287546eaSitojun ln->ln_rt = rt; 11359631a17bSitojun timeout_set(&ln->ln_timer_ch, nd6_llinfo_timer, ln); 1136287546eaSitojun /* this is required for "ndp" command. - shin */ 1137287546eaSitojun if (req == RTM_ADD) { 1138287546eaSitojun /* 1139287546eaSitojun * gate should have some valid AF_LINK entry, 1140287546eaSitojun * and ln->ln_expire should have some lifetime 1141287546eaSitojun * which is specified by ndp command. 1142287546eaSitojun */ 1143287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 1144f6e55599Sitojun ln->ln_byhint = 0; 1145287546eaSitojun } else { 1146287546eaSitojun /* 1147287546eaSitojun * When req == RTM_RESOLVE, rt is created and 1148287546eaSitojun * initialized in rtrequest(), so rt_expire is 0. 1149287546eaSitojun */ 1150287546eaSitojun ln->ln_state = ND6_LLINFO_NOSTATE; 11519631a17bSitojun nd6_llinfo_settimer(ln, 0); 1152287546eaSitojun } 1153287546eaSitojun rt->rt_flags |= RTF_LLINFO; 1154287546eaSitojun ln->ln_next = llinfo_nd6.ln_next; 1155287546eaSitojun llinfo_nd6.ln_next = ln; 1156287546eaSitojun ln->ln_prev = &llinfo_nd6; 1157287546eaSitojun ln->ln_next->ln_prev = ln; 1158287546eaSitojun 1159287546eaSitojun /* 1160287546eaSitojun * check if rt_key(rt) is one of my address assigned 1161287546eaSitojun * to the interface. 1162287546eaSitojun */ 1163287546eaSitojun ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp, 1164287546eaSitojun &SIN6(rt_key(rt))->sin6_addr); 1165287546eaSitojun if (ifa) { 1166287546eaSitojun caddr_t macp = nd6_ifptomac(ifp); 11679631a17bSitojun nd6_llinfo_settimer(ln, -1); 1168287546eaSitojun ln->ln_state = ND6_LLINFO_REACHABLE; 1169f6e55599Sitojun ln->ln_byhint = 0; 1170d8a7e3a7Sitojun mine = 1; 1171287546eaSitojun if (macp) { 1172287546eaSitojun Bcopy(macp, LLADDR(SDL(gate)), ifp->if_addrlen); 1173287546eaSitojun SDL(gate)->sdl_alen = ifp->if_addrlen; 1174287546eaSitojun } 1175287546eaSitojun if (nd6_useloopback) { 1176fcc641efSmickey rt->rt_ifp = lo0ifp; /*XXX*/ 1177287546eaSitojun /* 1178287546eaSitojun * Make sure rt_ifa be equal to the ifaddr 1179287546eaSitojun * corresponding to the address. 1180287546eaSitojun * We need this because when we refer 1181287546eaSitojun * rt_ifa->ia6_flags in ip6_input, we assume 1182287546eaSitojun * that the rt_ifa points to the address instead 1183287546eaSitojun * of the loopback address. 1184287546eaSitojun */ 1185287546eaSitojun if (ifa != rt->rt_ifa) { 11864f587652Sitojun IFAFREE(rt->rt_ifa); 1187287546eaSitojun ifa->ifa_refcnt++; 1188287546eaSitojun rt->rt_ifa = ifa; 1189287546eaSitojun } 1190287546eaSitojun } 1191f4f4d166Sitojun } else if (rt->rt_flags & RTF_ANNOUNCE) { 11929631a17bSitojun nd6_llinfo_settimer(ln, -1); 1193f4f4d166Sitojun ln->ln_state = ND6_LLINFO_REACHABLE; 1194f6e55599Sitojun ln->ln_byhint = 0; 1195f4f4d166Sitojun 1196f4f4d166Sitojun /* join solicited node multicast for proxy ND */ 1197f4f4d166Sitojun if (ifp->if_flags & IFF_MULTICAST) { 1198f4f4d166Sitojun struct in6_addr llsol; 1199f4f4d166Sitojun int error; 1200f4f4d166Sitojun 1201f4f4d166Sitojun llsol = SIN6(rt_key(rt))->sin6_addr; 1202f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 1203f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 1204f4f4d166Sitojun llsol.s6_addr32[1] = 0; 1205f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 1206f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 1207f4f4d166Sitojun 1208d8a7e3a7Sitojun if (in6_addmulti(&llsol, ifp, &error)) { 1209d8a7e3a7Sitojun nd6log((LOG_ERR, "%s: failed to join " 1210d8a7e3a7Sitojun "%s (errno=%d)\n", ifp->if_xname, 1211d8a7e3a7Sitojun ip6_sprintf(&llsol), error)); 1212d8a7e3a7Sitojun } 1213f4f4d166Sitojun } 1214287546eaSitojun } 1215287546eaSitojun break; 1216287546eaSitojun 1217287546eaSitojun case RTM_DELETE: 1218287546eaSitojun if (!ln) 1219287546eaSitojun break; 1220f4f4d166Sitojun /* leave from solicited node multicast for proxy ND */ 1221f4f4d166Sitojun if ((rt->rt_flags & RTF_ANNOUNCE) != 0 && 1222f4f4d166Sitojun (ifp->if_flags & IFF_MULTICAST) != 0) { 1223f4f4d166Sitojun struct in6_addr llsol; 1224f4f4d166Sitojun struct in6_multi *in6m; 1225f4f4d166Sitojun 1226f4f4d166Sitojun llsol = SIN6(rt_key(rt))->sin6_addr; 1227f4f4d166Sitojun llsol.s6_addr16[0] = htons(0xff02); 1228f4f4d166Sitojun llsol.s6_addr16[1] = htons(ifp->if_index); 1229f4f4d166Sitojun llsol.s6_addr32[1] = 0; 1230f4f4d166Sitojun llsol.s6_addr32[2] = htonl(1); 1231f4f4d166Sitojun llsol.s6_addr8[12] = 0xff; 1232f4f4d166Sitojun 1233f4f4d166Sitojun IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1234f4f4d166Sitojun if (in6m) 1235f4f4d166Sitojun in6_delmulti(in6m); 1236f4f4d166Sitojun } 1237287546eaSitojun nd6_inuse--; 1238287546eaSitojun ln->ln_next->ln_prev = ln->ln_prev; 1239287546eaSitojun ln->ln_prev->ln_next = ln->ln_next; 1240287546eaSitojun ln->ln_prev = NULL; 12419631a17bSitojun nd6_llinfo_settimer(ln, -1); 1242287546eaSitojun rt->rt_llinfo = 0; 1243287546eaSitojun rt->rt_flags &= ~RTF_LLINFO; 1244287546eaSitojun if (ln->ln_hold) 1245287546eaSitojun m_freem(ln->ln_hold); 1246287546eaSitojun Free((caddr_t)ln); 1247287546eaSitojun } 1248287546eaSitojun } 1249287546eaSitojun 1250287546eaSitojun int 1251287546eaSitojun nd6_ioctl(cmd, data, ifp) 1252287546eaSitojun u_long cmd; 1253287546eaSitojun caddr_t data; 1254287546eaSitojun struct ifnet *ifp; 1255287546eaSitojun { 1256287546eaSitojun struct in6_drlist *drl = (struct in6_drlist *)data; 1257d8a7e3a7Sitojun struct in6_oprlist *oprl = (struct in6_oprlist *)data; 1258287546eaSitojun struct in6_ndireq *ndi = (struct in6_ndireq *)data; 1259287546eaSitojun struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data; 1260f4f4d166Sitojun struct in6_ndifreq *ndif = (struct in6_ndifreq *)data; 1261d8a7e3a7Sitojun struct nd_defrouter *dr; 1262287546eaSitojun struct nd_prefix *pr; 1263287546eaSitojun struct rtentry *rt; 1264287546eaSitojun int i = 0, error = 0; 1265287546eaSitojun int s; 1266287546eaSitojun 1267287546eaSitojun switch (cmd) { 1268287546eaSitojun case SIOCGDRLST_IN6: 1269d8a7e3a7Sitojun /* 1270d8a7e3a7Sitojun * obsolete API, use sysctl under net.inet6.icmp6 1271d8a7e3a7Sitojun */ 1272287546eaSitojun bzero(drl, sizeof(*drl)); 12736e92dee6Sitojun s = splsoftnet(); 1274f4f4d166Sitojun dr = TAILQ_FIRST(&nd_defrouter); 1275287546eaSitojun while (dr && i < DRLSTSIZ) { 1276287546eaSitojun drl->defrouter[i].rtaddr = dr->rtaddr; 1277287546eaSitojun if (IN6_IS_ADDR_LINKLOCAL(&drl->defrouter[i].rtaddr)) { 1278287546eaSitojun /* XXX: need to this hack for KAME stack */ 1279287546eaSitojun drl->defrouter[i].rtaddr.s6_addr16[1] = 0; 1280f6e55599Sitojun } else 1281287546eaSitojun log(LOG_ERR, 1282287546eaSitojun "default router list contains a " 1283287546eaSitojun "non-linklocal address(%s)\n", 1284287546eaSitojun ip6_sprintf(&drl->defrouter[i].rtaddr)); 1285287546eaSitojun 1286287546eaSitojun drl->defrouter[i].flags = dr->flags; 1287287546eaSitojun drl->defrouter[i].rtlifetime = dr->rtlifetime; 1288287546eaSitojun drl->defrouter[i].expire = dr->expire; 1289287546eaSitojun drl->defrouter[i].if_index = dr->ifp->if_index; 1290287546eaSitojun i++; 1291f4f4d166Sitojun dr = TAILQ_NEXT(dr, dr_entry); 1292287546eaSitojun } 1293287546eaSitojun splx(s); 1294287546eaSitojun break; 1295287546eaSitojun case SIOCGPRLST_IN6: 1296f4f4d166Sitojun /* 1297d8a7e3a7Sitojun * obsolete API, use sysctl under net.inet6.icmp6 1298d8a7e3a7Sitojun * 1299d8a7e3a7Sitojun * XXX the structure in6_prlist was changed in backward- 1300d8a7e3a7Sitojun * incompatible manner. in6_oprlist is used for SIOCGPRLST_IN6, 1301d8a7e3a7Sitojun * in6_prlist is used for nd6_sysctl() - fill_prlist(). 1302d8a7e3a7Sitojun */ 1303d8a7e3a7Sitojun /* 13048b542bbeSpascoe * XXX meaning of fields, especially "raflags", is very 13058b542bbeSpascoe * different between RA prefix list and RR/static prefix list. 1306f4f4d166Sitojun * how about separating ioctls into two? 1307f4f4d166Sitojun */ 1308d8a7e3a7Sitojun bzero(oprl, sizeof(*oprl)); 13096e92dee6Sitojun s = splsoftnet(); 1310545205eaSpyr pr = LIST_FIRST(&nd_prefix); 1311287546eaSitojun while (pr && i < PRLSTSIZ) { 1312287546eaSitojun struct nd_pfxrouter *pfr; 1313287546eaSitojun int j; 1314287546eaSitojun 1315d8a7e3a7Sitojun oprl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr; 1316d8a7e3a7Sitojun oprl->prefix[i].raflags = pr->ndpr_raf; 1317d8a7e3a7Sitojun oprl->prefix[i].prefixlen = pr->ndpr_plen; 1318d8a7e3a7Sitojun oprl->prefix[i].vltime = pr->ndpr_vltime; 1319d8a7e3a7Sitojun oprl->prefix[i].pltime = pr->ndpr_pltime; 1320d8a7e3a7Sitojun oprl->prefix[i].if_index = pr->ndpr_ifp->if_index; 1321d8a7e3a7Sitojun oprl->prefix[i].expire = pr->ndpr_expire; 1322287546eaSitojun 1323545205eaSpyr pfr = LIST_FIRST(&pr->ndpr_advrtrs); 1324287546eaSitojun j = 0; 1325287546eaSitojun while(pfr) { 1326287546eaSitojun if (j < DRLSTSIZ) { 1327d8a7e3a7Sitojun #define RTRADDR oprl->prefix[i].advrtr[j] 1328287546eaSitojun RTRADDR = pfr->router->rtaddr; 1329287546eaSitojun if (IN6_IS_ADDR_LINKLOCAL(&RTRADDR)) { 1330287546eaSitojun /* XXX: hack for KAME */ 1331287546eaSitojun RTRADDR.s6_addr16[1] = 0; 1332f6e55599Sitojun } else 1333287546eaSitojun log(LOG_ERR, 1334287546eaSitojun "a router(%s) advertises " 1335287546eaSitojun "a prefix with " 1336287546eaSitojun "non-link local address\n", 1337287546eaSitojun ip6_sprintf(&RTRADDR)); 1338287546eaSitojun #undef RTRADDR 1339287546eaSitojun } 1340287546eaSitojun j++; 1341545205eaSpyr pfr = LIST_NEXT(pfr, pfr_entry); 1342287546eaSitojun } 1343d8a7e3a7Sitojun oprl->prefix[i].advrtrs = j; 1344d8a7e3a7Sitojun oprl->prefix[i].origin = PR_ORIG_RA; 1345287546eaSitojun 1346287546eaSitojun i++; 1347545205eaSpyr pr = LIST_NEXT(pr, ndpr_entry); 1348287546eaSitojun } 1349f4f4d166Sitojun splx(s); 1350287546eaSitojun 1351287546eaSitojun break; 1352d6b9e9b9Sitojun case OSIOCGIFINFO_IN6: 1353d6b9e9b9Sitojun /* XXX: old ndp(8) assumes a positive value for linkmtu. */ 1354191a775dSitojun bzero(&ndi->ndi, sizeof(ndi->ndi)); 1355d6b9e9b9Sitojun ndi->ndi.linkmtu = IN6_LINKMTU(ifp); 1356d6b9e9b9Sitojun ndi->ndi.maxmtu = ND_IFINFO(ifp)->maxmtu; 1357d6b9e9b9Sitojun ndi->ndi.basereachable = ND_IFINFO(ifp)->basereachable; 1358d6b9e9b9Sitojun ndi->ndi.reachable = ND_IFINFO(ifp)->reachable; 1359d6b9e9b9Sitojun ndi->ndi.retrans = ND_IFINFO(ifp)->retrans; 1360d6b9e9b9Sitojun ndi->ndi.flags = ND_IFINFO(ifp)->flags; 1361d6b9e9b9Sitojun ndi->ndi.recalctm = ND_IFINFO(ifp)->recalctm; 1362d6b9e9b9Sitojun ndi->ndi.chlim = ND_IFINFO(ifp)->chlim; 1363cfab95f2Sitojun break; 1364d6b9e9b9Sitojun case SIOCGIFINFO_IN6: 1365d6b9e9b9Sitojun ndi->ndi = *ND_IFINFO(ifp); 1366287546eaSitojun break; 1367d374aaacSitojun case SIOCSIFINFO_FLAGS: 1368d6b9e9b9Sitojun ND_IFINFO(ifp)->flags = ndi->ndi.flags; 1369d374aaacSitojun break; 1370f4f4d166Sitojun case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */ 1371d8a7e3a7Sitojun /* sync kernel routing table with the default router list */ 1372d8a7e3a7Sitojun defrouter_reset(); 1373f4f4d166Sitojun defrouter_select(); 1374287546eaSitojun break; 1375287546eaSitojun case SIOCSPFXFLUSH_IN6: 1376287546eaSitojun { 1377287546eaSitojun /* flush all the prefix advertised by routers */ 1378287546eaSitojun struct nd_prefix *pr, *next; 1379287546eaSitojun 13806e92dee6Sitojun s = splsoftnet(); 1381545205eaSpyr for (pr = LIST_FIRST(&nd_prefix); pr; pr = next) { 1382d8a7e3a7Sitojun struct in6_ifaddr *ia, *ia_next; 1383d8a7e3a7Sitojun 1384545205eaSpyr next = LIST_NEXT(pr, ndpr_entry); 1385d8a7e3a7Sitojun 1386d8a7e3a7Sitojun if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1387d8a7e3a7Sitojun continue; /* XXX */ 1388d8a7e3a7Sitojun 1389d8a7e3a7Sitojun /* do we really have to remove addresses as well? */ 1390d8a7e3a7Sitojun for (ia = in6_ifaddr; ia; ia = ia_next) { 1391d8a7e3a7Sitojun /* ia might be removed. keep the next ptr. */ 1392d8a7e3a7Sitojun ia_next = ia->ia_next; 1393d8a7e3a7Sitojun 1394d8a7e3a7Sitojun if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1395d8a7e3a7Sitojun continue; 1396d8a7e3a7Sitojun 1397d8a7e3a7Sitojun if (ia->ia6_ndpr == pr) 1398d8a7e3a7Sitojun in6_purgeaddr(&ia->ia_ifa); 1399d8a7e3a7Sitojun } 1400287546eaSitojun prelist_remove(pr); 1401287546eaSitojun } 1402287546eaSitojun splx(s); 1403287546eaSitojun break; 1404287546eaSitojun } 1405287546eaSitojun case SIOCSRTRFLUSH_IN6: 1406287546eaSitojun { 1407287546eaSitojun /* flush all the default routers */ 1408287546eaSitojun struct nd_defrouter *dr, *next; 1409287546eaSitojun 14106e92dee6Sitojun s = splsoftnet(); 1411d8a7e3a7Sitojun defrouter_reset(); 1412d8a7e3a7Sitojun for (dr = TAILQ_FIRST(&nd_defrouter); dr; dr = next) { 1413f4f4d166Sitojun next = TAILQ_NEXT(dr, dr_entry); 1414287546eaSitojun defrtrlist_del(dr); 1415287546eaSitojun } 1416d8a7e3a7Sitojun defrouter_select(); 1417287546eaSitojun splx(s); 1418287546eaSitojun break; 1419287546eaSitojun } 1420287546eaSitojun case SIOCGNBRINFO_IN6: 1421287546eaSitojun { 1422287546eaSitojun struct llinfo_nd6 *ln; 1423287546eaSitojun struct in6_addr nb_addr = nbi->addr; /* make local for safety */ 1424287546eaSitojun 1425287546eaSitojun /* 1426287546eaSitojun * XXX: KAME specific hack for scoped addresses 1427287546eaSitojun * XXXX: for other scopes than link-local? 1428287546eaSitojun */ 1429287546eaSitojun if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) || 1430287546eaSitojun IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) { 1431287546eaSitojun u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2]; 1432287546eaSitojun 1433287546eaSitojun if (*idp == 0) 1434287546eaSitojun *idp = htons(ifp->if_index); 1435287546eaSitojun } 1436287546eaSitojun 14376e92dee6Sitojun s = splsoftnet(); 1438d8a7e3a7Sitojun if ((rt = nd6_lookup(&nb_addr, 0, ifp)) == NULL || 1439d8a7e3a7Sitojun (ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) { 1440287546eaSitojun error = EINVAL; 144191e69634Sitojun splx(s); 1442287546eaSitojun break; 1443287546eaSitojun } 1444287546eaSitojun nbi->state = ln->ln_state; 1445287546eaSitojun nbi->asked = ln->ln_asked; 1446287546eaSitojun nbi->isrouter = ln->ln_router; 1447287546eaSitojun nbi->expire = ln->ln_expire; 1448287546eaSitojun splx(s); 1449287546eaSitojun 1450287546eaSitojun break; 1451287546eaSitojun } 1452f4f4d166Sitojun case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1453f4f4d166Sitojun ndif->ifindex = nd6_defifindex; 1454f4f4d166Sitojun break; 1455f4f4d166Sitojun case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1456f4f4d166Sitojun return (nd6_setdefaultiface(ndif->ifindex)); 1457f4f4d166Sitojun break; 1458287546eaSitojun } 1459287546eaSitojun return (error); 1460287546eaSitojun } 1461287546eaSitojun 1462287546eaSitojun /* 1463287546eaSitojun * Create neighbor cache entry and cache link-layer address, 1464287546eaSitojun * on reception of inbound ND6 packets. (RS/RA/NS/redirect) 1465287546eaSitojun */ 1466287546eaSitojun struct rtentry * 1467287546eaSitojun nd6_cache_lladdr(ifp, from, lladdr, lladdrlen, type, code) 1468287546eaSitojun struct ifnet *ifp; 1469287546eaSitojun struct in6_addr *from; 1470287546eaSitojun char *lladdr; 1471287546eaSitojun int lladdrlen; 1472287546eaSitojun int type; /* ICMP6 type */ 1473287546eaSitojun int code; /* type dependent information */ 1474287546eaSitojun { 1475287546eaSitojun struct rtentry *rt = NULL; 1476287546eaSitojun struct llinfo_nd6 *ln = NULL; 1477287546eaSitojun int is_newentry; 1478287546eaSitojun struct sockaddr_dl *sdl = NULL; 1479287546eaSitojun int do_update; 1480287546eaSitojun int olladdr; 1481287546eaSitojun int llchange; 1482287546eaSitojun int newstate = 0; 1483287546eaSitojun 1484287546eaSitojun if (!ifp) 1485287546eaSitojun panic("ifp == NULL in nd6_cache_lladdr"); 1486287546eaSitojun if (!from) 1487287546eaSitojun panic("from == NULL in nd6_cache_lladdr"); 1488287546eaSitojun 1489287546eaSitojun /* nothing must be updated for unspecified address */ 1490287546eaSitojun if (IN6_IS_ADDR_UNSPECIFIED(from)) 1491287546eaSitojun return NULL; 1492287546eaSitojun 1493287546eaSitojun /* 1494287546eaSitojun * Validation about ifp->if_addrlen and lladdrlen must be done in 1495287546eaSitojun * the caller. 1496287546eaSitojun * 14978b542bbeSpascoe * XXX If the link does not have link-layer address, what should 1498287546eaSitojun * we do? (ifp->if_addrlen == 0) 1499287546eaSitojun * Spec says nothing in sections for RA, RS and NA. There's small 1500287546eaSitojun * description on it in NS section (RFC 2461 7.2.3). 1501287546eaSitojun */ 1502287546eaSitojun 1503287546eaSitojun rt = nd6_lookup(from, 0, ifp); 1504287546eaSitojun if (!rt) { 1505287546eaSitojun #if 0 1506287546eaSitojun /* nothing must be done if there's no lladdr */ 1507287546eaSitojun if (!lladdr || !lladdrlen) 1508287546eaSitojun return NULL; 1509287546eaSitojun #endif 1510287546eaSitojun 1511287546eaSitojun rt = nd6_lookup(from, 1, ifp); 1512287546eaSitojun is_newentry = 1; 15130a2c5741Sitojun } else { 15140a2c5741Sitojun /* do nothing if static ndp is set */ 15150a2c5741Sitojun if (rt->rt_flags & RTF_STATIC) 15160a2c5741Sitojun return NULL; 1517287546eaSitojun is_newentry = 0; 15180a2c5741Sitojun } 1519287546eaSitojun 1520287546eaSitojun if (!rt) 1521287546eaSitojun return NULL; 1522287546eaSitojun if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) { 1523287546eaSitojun fail: 1524d8a7e3a7Sitojun (void)nd6_free(rt, 0); 1525287546eaSitojun return NULL; 1526287546eaSitojun } 1527287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1528287546eaSitojun if (!ln) 1529287546eaSitojun goto fail; 1530287546eaSitojun if (!rt->rt_gateway) 1531287546eaSitojun goto fail; 1532287546eaSitojun if (rt->rt_gateway->sa_family != AF_LINK) 1533287546eaSitojun goto fail; 1534287546eaSitojun sdl = SDL(rt->rt_gateway); 1535287546eaSitojun 1536287546eaSitojun olladdr = (sdl->sdl_alen) ? 1 : 0; 1537287546eaSitojun if (olladdr && lladdr) { 1538287546eaSitojun if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 1539287546eaSitojun llchange = 1; 1540287546eaSitojun else 1541287546eaSitojun llchange = 0; 1542287546eaSitojun } else 1543287546eaSitojun llchange = 0; 1544287546eaSitojun 1545287546eaSitojun /* 1546287546eaSitojun * newentry olladdr lladdr llchange (*=record) 1547287546eaSitojun * 0 n n -- (1) 1548287546eaSitojun * 0 y n -- (2) 1549287546eaSitojun * 0 n y -- (3) * STALE 1550287546eaSitojun * 0 y y n (4) * 1551287546eaSitojun * 0 y y y (5) * STALE 1552287546eaSitojun * 1 -- n -- (6) NOSTATE(= PASSIVE) 1553287546eaSitojun * 1 -- y -- (7) * STALE 1554287546eaSitojun */ 1555287546eaSitojun 1556287546eaSitojun if (lladdr) { /* (3-5) and (7) */ 1557287546eaSitojun /* 1558287546eaSitojun * Record source link-layer address 1559287546eaSitojun * XXX is it dependent to ifp->if_type? 1560287546eaSitojun */ 1561287546eaSitojun sdl->sdl_alen = ifp->if_addrlen; 1562287546eaSitojun bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 1563287546eaSitojun } 1564287546eaSitojun 1565287546eaSitojun if (!is_newentry) { 1566d8a7e3a7Sitojun if ((!olladdr && lladdr) || /* (3) */ 1567d8a7e3a7Sitojun (olladdr && lladdr && llchange)) { /* (5) */ 1568287546eaSitojun do_update = 1; 1569287546eaSitojun newstate = ND6_LLINFO_STALE; 1570287546eaSitojun } else /* (1-2,4) */ 1571287546eaSitojun do_update = 0; 1572287546eaSitojun } else { 1573287546eaSitojun do_update = 1; 1574287546eaSitojun if (!lladdr) /* (6) */ 1575287546eaSitojun newstate = ND6_LLINFO_NOSTATE; 1576287546eaSitojun else /* (7) */ 1577287546eaSitojun newstate = ND6_LLINFO_STALE; 1578287546eaSitojun } 1579287546eaSitojun 1580287546eaSitojun if (do_update) { 1581287546eaSitojun /* 1582287546eaSitojun * Update the state of the neighbor cache. 1583287546eaSitojun */ 1584287546eaSitojun ln->ln_state = newstate; 1585287546eaSitojun 1586287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 15878a7bb304Sitojun /* 15888a7bb304Sitojun * XXX: since nd6_output() below will cause 15898b542bbeSpascoe * state transition to DELAY and reset the timer, 15908a7bb304Sitojun * we must set the timer now, although it is actually 15918a7bb304Sitojun * meaningless. 15928a7bb304Sitojun */ 15939631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 15948a7bb304Sitojun 1595287546eaSitojun if (ln->ln_hold) { 1596e212adedSkrw struct mbuf *n = ln->ln_hold; 1597e212adedSkrw ln->ln_hold = NULL; 15986afad192Sitojun /* 15996afad192Sitojun * we assume ifp is not a p2p here, so just 16006afad192Sitojun * set the 2nd argument as the 1st one. 16016afad192Sitojun */ 1602e212adedSkrw nd6_output(ifp, ifp, n, 1603d8a7e3a7Sitojun (struct sockaddr_in6 *)rt_key(rt), rt); 1604e212adedSkrw if (ln->ln_hold == n) { 1605e212adedSkrw /* n is back in ln_hold. Discard. */ 1606e212adedSkrw m_freem(ln->ln_hold); 16078a7bb304Sitojun ln->ln_hold = NULL; 1608287546eaSitojun } 1609e212adedSkrw } 1610287546eaSitojun } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 1611287546eaSitojun /* probe right away */ 16129631a17bSitojun nd6_llinfo_settimer((void *)ln, 0); 1613287546eaSitojun } 1614287546eaSitojun } 1615287546eaSitojun 1616287546eaSitojun /* 1617287546eaSitojun * ICMP6 type dependent behavior. 1618287546eaSitojun * 1619287546eaSitojun * NS: clear IsRouter if new entry 1620287546eaSitojun * RS: clear IsRouter 1621287546eaSitojun * RA: set IsRouter if there's lladdr 1622287546eaSitojun * redir: clear IsRouter if new entry 1623287546eaSitojun * 1624287546eaSitojun * RA case, (1): 1625287546eaSitojun * The spec says that we must set IsRouter in the following cases: 1626287546eaSitojun * - If lladdr exist, set IsRouter. This means (1-5). 1627287546eaSitojun * - If it is old entry (!newentry), set IsRouter. This means (7). 1628287546eaSitojun * So, based on the spec, in (1-5) and (7) cases we must set IsRouter. 16298b542bbeSpascoe * A question arises for (1) case. (1) case has no lladdr in the 1630287546eaSitojun * neighbor cache, this is similar to (6). 1631287546eaSitojun * This case is rare but we figured that we MUST NOT set IsRouter. 1632287546eaSitojun * 1633287546eaSitojun * newentry olladdr lladdr llchange NS RS RA redir 1634287546eaSitojun * D R 1635287546eaSitojun * 0 n n -- (1) c ? s 1636287546eaSitojun * 0 y n -- (2) c s s 1637287546eaSitojun * 0 n y -- (3) c s s 1638287546eaSitojun * 0 y y n (4) c s s 1639287546eaSitojun * 0 y y y (5) c s s 1640287546eaSitojun * 1 -- n -- (6) c c c s 1641287546eaSitojun * 1 -- y -- (7) c c s c s 1642287546eaSitojun * 1643287546eaSitojun * (c=clear s=set) 1644287546eaSitojun */ 1645287546eaSitojun switch (type & 0xff) { 1646287546eaSitojun case ND_NEIGHBOR_SOLICIT: 1647287546eaSitojun /* 1648287546eaSitojun * New entry must have is_router flag cleared. 1649287546eaSitojun */ 1650287546eaSitojun if (is_newentry) /* (6-7) */ 1651287546eaSitojun ln->ln_router = 0; 1652287546eaSitojun break; 1653287546eaSitojun case ND_REDIRECT: 1654287546eaSitojun /* 1655287546eaSitojun * If the icmp is a redirect to a better router, always set the 1656287546eaSitojun * is_router flag. Otherwise, if the entry is newly created, 1657287546eaSitojun * clear the flag. [RFC 2461, sec 8.3] 1658287546eaSitojun */ 1659287546eaSitojun if (code == ND_REDIRECT_ROUTER) 1660287546eaSitojun ln->ln_router = 1; 1661287546eaSitojun else if (is_newentry) /* (6-7) */ 1662287546eaSitojun ln->ln_router = 0; 1663287546eaSitojun break; 1664287546eaSitojun case ND_ROUTER_SOLICIT: 1665287546eaSitojun /* 1666287546eaSitojun * is_router flag must always be cleared. 1667287546eaSitojun */ 1668287546eaSitojun ln->ln_router = 0; 1669287546eaSitojun break; 1670287546eaSitojun case ND_ROUTER_ADVERT: 1671287546eaSitojun /* 1672287546eaSitojun * Mark an entry with lladdr as a router. 1673287546eaSitojun */ 1674d8a7e3a7Sitojun if ((!is_newentry && (olladdr || lladdr)) || /* (2-5) */ 1675d8a7e3a7Sitojun (is_newentry && lladdr)) { /* (7) */ 1676287546eaSitojun ln->ln_router = 1; 1677287546eaSitojun } 1678287546eaSitojun break; 1679287546eaSitojun } 1680287546eaSitojun 168150ccc024Sitojun /* 168250ccc024Sitojun * When the link-layer address of a router changes, select the 168350ccc024Sitojun * best router again. In particular, when the neighbor entry is newly 168450ccc024Sitojun * created, it might affect the selection policy. 168550ccc024Sitojun * Question: can we restrict the first condition to the "is_newentry" 168650ccc024Sitojun * case? 168750ccc024Sitojun * XXX: when we hear an RA from a new router with the link-layer 168850ccc024Sitojun * address option, defrouter_select() is called twice, since 168950ccc024Sitojun * defrtrlist_update called the function as well. However, I believe 169050ccc024Sitojun * we can compromise the overhead, since it only happens the first 169150ccc024Sitojun * time. 1692d8a7e3a7Sitojun * XXX: although defrouter_select() should not have a bad effect 1693d8a7e3a7Sitojun * for those are not autoconfigured hosts, we explicitly avoid such 1694d8a7e3a7Sitojun * cases for safety. 169550ccc024Sitojun */ 169629ee75acSitojun if (do_update && ln->ln_router && !ip6_forwarding && ip6_accept_rtadv) 169750ccc024Sitojun defrouter_select(); 169850ccc024Sitojun 1699287546eaSitojun return rt; 1700287546eaSitojun } 1701287546eaSitojun 1702287546eaSitojun static void 1703287546eaSitojun nd6_slowtimo(ignored_arg) 1704287546eaSitojun void *ignored_arg; 1705287546eaSitojun { 17066e92dee6Sitojun int s = splsoftnet(); 1707b3c1e4c1Sitojun struct nd_ifinfo *nd6if; 1708d6b9e9b9Sitojun struct ifnet *ifp; 1709287546eaSitojun 1710b3c1e4c1Sitojun timeout_set(&nd6_slowtimo_ch, nd6_slowtimo, NULL); 1711b3c1e4c1Sitojun timeout_add(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz); 1712d6b9e9b9Sitojun for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1713d6b9e9b9Sitojun { 1714d6b9e9b9Sitojun nd6if = ND_IFINFO(ifp); 1715287546eaSitojun if (nd6if->basereachable && /* already initialized */ 1716287546eaSitojun (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) { 1717287546eaSitojun /* 1718287546eaSitojun * Since reachable time rarely changes by router 1719287546eaSitojun * advertisements, we SHOULD insure that a new random 1720287546eaSitojun * value gets recomputed at least once every few hours. 1721287546eaSitojun * (RFC 2461, 6.3.4) 1722287546eaSitojun */ 1723287546eaSitojun nd6if->recalctm = nd6_recalc_reachtm_interval; 1724287546eaSitojun nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable); 1725287546eaSitojun } 1726287546eaSitojun } 1727287546eaSitojun splx(s); 1728287546eaSitojun } 1729287546eaSitojun 1730287546eaSitojun #define senderr(e) { error = (e); goto bad;} 1731287546eaSitojun int 17326afad192Sitojun nd6_output(ifp, origifp, m0, dst, rt0) 1733b3c1e4c1Sitojun struct ifnet *ifp; 17346afad192Sitojun struct ifnet *origifp; 1735287546eaSitojun struct mbuf *m0; 1736287546eaSitojun struct sockaddr_in6 *dst; 1737287546eaSitojun struct rtentry *rt0; 1738287546eaSitojun { 1739b3c1e4c1Sitojun struct mbuf *m = m0; 1740b3c1e4c1Sitojun struct rtentry *rt = rt0; 1741cfb6b8dfSitojun struct sockaddr_in6 *gw6 = NULL; 1742287546eaSitojun struct llinfo_nd6 *ln = NULL; 1743287546eaSitojun int error = 0; 1744cb39d30aSangelos #ifdef IPSEC 1745cb39d30aSangelos struct m_tag *mtag; 1746cb39d30aSangelos #endif /* IPSEC */ 1747287546eaSitojun 1748287546eaSitojun if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr)) 1749287546eaSitojun goto sendpkt; 1750287546eaSitojun 1751d8a7e3a7Sitojun if (nd6_need_cache(ifp) == 0) 1752287546eaSitojun goto sendpkt; 1753287546eaSitojun 1754287546eaSitojun /* 17558b542bbeSpascoe * next hop determination. This routine is derived from ether_output. 1756287546eaSitojun */ 1757287546eaSitojun if (rt) { 1758287546eaSitojun if ((rt->rt_flags & RTF_UP) == 0) { 1759d8a7e3a7Sitojun if ((rt0 = rt = rtalloc1((struct sockaddr *)dst, 1760c241aca8Shenning 1, 0)) != NULL) 1761287546eaSitojun { 1762287546eaSitojun rt->rt_refcnt--; 1763fe16f6efSitojun if (rt->rt_ifp != ifp) 1764fe16f6efSitojun senderr(EHOSTUNREACH); 1765287546eaSitojun } else 1766287546eaSitojun senderr(EHOSTUNREACH); 1767287546eaSitojun } 1768cfb6b8dfSitojun 1769287546eaSitojun if (rt->rt_flags & RTF_GATEWAY) { 1770cfb6b8dfSitojun gw6 = (struct sockaddr_in6 *)rt->rt_gateway; 1771cfb6b8dfSitojun 1772cfb6b8dfSitojun /* 1773cfb6b8dfSitojun * We skip link-layer address resolution and NUD 1774cfb6b8dfSitojun * if the gateway is not a neighbor from ND point 1775d8a7e3a7Sitojun * of view, regardless of the value of nd_ifinfo.flags. 177634deef1eSitojun * The second condition is a bit tricky; we skip 1777cfb6b8dfSitojun * if the gateway is our own address, which is 1778cfb6b8dfSitojun * sometimes used to install a route to a p2p link. 1779cfb6b8dfSitojun */ 1780cfb6b8dfSitojun if (!nd6_is_addr_neighbor(gw6, ifp) || 1781cfb6b8dfSitojun in6ifa_ifpwithaddr(ifp, &gw6->sin6_addr)) { 1782cfb6b8dfSitojun /* 1783cfb6b8dfSitojun * We allow this kind of tricky route only 1784cfb6b8dfSitojun * when the outgoing interface is p2p. 1785cfb6b8dfSitojun * XXX: we may need a more generic rule here. 1786cfb6b8dfSitojun */ 1787cfb6b8dfSitojun if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1788cfb6b8dfSitojun senderr(EHOSTUNREACH); 1789cfb6b8dfSitojun 1790cfb6b8dfSitojun goto sendpkt; 1791cfb6b8dfSitojun } 1792cfb6b8dfSitojun 1793287546eaSitojun if (rt->rt_gwroute == 0) 1794287546eaSitojun goto lookup; 1795287546eaSitojun if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 1796287546eaSitojun rtfree(rt); rt = rt0; 1797d8a7e3a7Sitojun lookup: 1798c241aca8Shenning rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 0); 1799287546eaSitojun if ((rt = rt->rt_gwroute) == 0) 1800287546eaSitojun senderr(EHOSTUNREACH); 1801287546eaSitojun } 1802287546eaSitojun } 1803287546eaSitojun } 1804287546eaSitojun 1805287546eaSitojun /* 1806287546eaSitojun * Address resolution or Neighbor Unreachability Detection 1807287546eaSitojun * for the next hop. 1808287546eaSitojun * At this point, the destination of the packet must be a unicast 1809287546eaSitojun * or an anycast address(i.e. not a multicast). 1810287546eaSitojun */ 1811287546eaSitojun 1812287546eaSitojun /* Look up the neighbor cache for the nexthop */ 1813287546eaSitojun if (rt && (rt->rt_flags & RTF_LLINFO) != 0) 1814287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1815287546eaSitojun else { 1816cfb6b8dfSitojun /* 1817cfb6b8dfSitojun * Since nd6_is_addr_neighbor() internally calls nd6_lookup(), 1818cfb6b8dfSitojun * the condition below is not very efficient. But we believe 1819cfb6b8dfSitojun * it is tolerable, because this should be a rare case. 1820cfb6b8dfSitojun */ 1821cfb6b8dfSitojun if (nd6_is_addr_neighbor(dst, ifp) && 1822cfb6b8dfSitojun (rt = nd6_lookup(&dst->sin6_addr, 1, ifp)) != NULL) 1823287546eaSitojun ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1824287546eaSitojun } 1825287546eaSitojun if (!ln || !rt) { 1826cfb6b8dfSitojun if ((ifp->if_flags & IFF_POINTOPOINT) == 0 && 1827d6b9e9b9Sitojun !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) { 1828cfb6b8dfSitojun log(LOG_DEBUG, 1829cfb6b8dfSitojun "nd6_output: can't allocate llinfo for %s " 1830287546eaSitojun "(ln=%p, rt=%p)\n", 1831287546eaSitojun ip6_sprintf(&dst->sin6_addr), ln, rt); 1832287546eaSitojun senderr(EIO); /* XXX: good error? */ 1833287546eaSitojun } 1834287546eaSitojun 1835cfb6b8dfSitojun goto sendpkt; /* send anyway */ 1836cfb6b8dfSitojun } 1837cfb6b8dfSitojun 1838d374aaacSitojun /* We don't have to do link-layer address resolution on a p2p link. */ 1839d374aaacSitojun if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1840be4e9e12Sitojun ln->ln_state < ND6_LLINFO_REACHABLE) { 1841d374aaacSitojun ln->ln_state = ND6_LLINFO_STALE; 18429631a17bSitojun nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 1843be4e9e12Sitojun } 1844287546eaSitojun 1845287546eaSitojun /* 1846287546eaSitojun * The first time we send a packet to a neighbor whose entry is 1847287546eaSitojun * STALE, we have to change the state to DELAY and a sets a timer to 1848287546eaSitojun * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do 1849287546eaSitojun * neighbor unreachability detection on expiration. 1850287546eaSitojun * (RFC 2461 7.3.3) 1851287546eaSitojun */ 1852287546eaSitojun if (ln->ln_state == ND6_LLINFO_STALE) { 1853287546eaSitojun ln->ln_asked = 0; 1854287546eaSitojun ln->ln_state = ND6_LLINFO_DELAY; 18559631a17bSitojun nd6_llinfo_settimer(ln, nd6_delay * hz); 1856287546eaSitojun } 1857287546eaSitojun 1858287546eaSitojun /* 1859287546eaSitojun * If the neighbor cache entry has a state other than INCOMPLETE 186034deef1eSitojun * (i.e. its link-layer address is already resolved), just 1861287546eaSitojun * send the packet. 1862287546eaSitojun */ 1863287546eaSitojun if (ln->ln_state > ND6_LLINFO_INCOMPLETE) 1864287546eaSitojun goto sendpkt; 1865287546eaSitojun 1866287546eaSitojun /* 1867287546eaSitojun * There is a neighbor cache entry, but no ethernet address 1868287546eaSitojun * response yet. Replace the held mbuf (if any) with this 1869287546eaSitojun * latest one. 1870287546eaSitojun */ 1871efcf292bSitojun if (ln->ln_state == ND6_LLINFO_NOSTATE) 1872287546eaSitojun ln->ln_state = ND6_LLINFO_INCOMPLETE; 1873287546eaSitojun if (ln->ln_hold) 1874287546eaSitojun m_freem(ln->ln_hold); 1875287546eaSitojun ln->ln_hold = m; 187676843262Sitojun /* 187776843262Sitojun * If there has been no NS for the neighbor after entering the 187876843262Sitojun * INCOMPLETE state, send the first solicitation. 187976843262Sitojun */ 18809631a17bSitojun if (!ND6_LLINFO_PERMANENT(ln) && ln->ln_asked == 0) { 1881287546eaSitojun ln->ln_asked++; 18829631a17bSitojun nd6_llinfo_settimer(ln, 18839631a17bSitojun (long)ND_IFINFO(ifp)->retrans * hz / 1000); 1884287546eaSitojun nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 1885287546eaSitojun } 1886287546eaSitojun return (0); 1887287546eaSitojun 1888287546eaSitojun sendpkt: 1889cb39d30aSangelos #ifdef IPSEC 1890cb39d30aSangelos /* 1891cb39d30aSangelos * If the packet needs outgoing IPsec crypto processing and the 1892cb39d30aSangelos * interface doesn't support it, drop it. 1893cb39d30aSangelos */ 1894cb39d30aSangelos mtag = m_tag_find(m, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL); 1895cb39d30aSangelos #endif /* IPSEC */ 18966afad192Sitojun 18970a2c5741Sitojun if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 1898cb39d30aSangelos #ifdef IPSEC 1899cb39d30aSangelos if (mtag != NULL && 1900cb39d30aSangelos (origifp->if_capabilities & IFCAP_IPSEC) == 0) { 1901cb39d30aSangelos /* Tell IPsec to do its own crypto. */ 1902cb39d30aSangelos ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 1903cb39d30aSangelos error = EACCES; 1904cb39d30aSangelos goto bad; 1905cb39d30aSangelos } 1906cb39d30aSangelos #endif /* IPSEC */ 19076afad192Sitojun return ((*ifp->if_output)(origifp, m, (struct sockaddr *)dst, 19086afad192Sitojun rt)); 19096afad192Sitojun } 1910cb39d30aSangelos #ifdef IPSEC 1911cb39d30aSangelos if (mtag != NULL && 1912cb39d30aSangelos (ifp->if_capabilities & IFCAP_IPSEC) == 0) { 1913cb39d30aSangelos /* Tell IPsec to do its own crypto. */ 1914cb39d30aSangelos ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 1915cb39d30aSangelos error = EACCES; 1916cb39d30aSangelos goto bad; 1917cb39d30aSangelos } 1918cb39d30aSangelos #endif /* IPSEC */ 1919287546eaSitojun return ((*ifp->if_output)(ifp, m, (struct sockaddr *)dst, rt)); 1920287546eaSitojun 1921287546eaSitojun bad: 1922287546eaSitojun if (m) 1923287546eaSitojun m_freem(m); 1924287546eaSitojun return (error); 1925287546eaSitojun } 1926287546eaSitojun #undef senderr 1927287546eaSitojun 1928287546eaSitojun int 1929d8a7e3a7Sitojun nd6_need_cache(ifp) 1930d8a7e3a7Sitojun struct ifnet *ifp; 1931d8a7e3a7Sitojun { 1932d8a7e3a7Sitojun /* 1933d8a7e3a7Sitojun * XXX: we currently do not make neighbor cache on any interface 193440765843Shenning * other than Ethernet, FDDI and GIF. 1935d8a7e3a7Sitojun * 1936d8a7e3a7Sitojun * RFC2893 says: 1937d8a7e3a7Sitojun * - unidirectional tunnels needs no ND 1938d8a7e3a7Sitojun */ 1939d8a7e3a7Sitojun switch (ifp->if_type) { 1940d8a7e3a7Sitojun case IFT_ETHER: 1941d8a7e3a7Sitojun case IFT_FDDI: 1942d8a7e3a7Sitojun case IFT_IEEE1394: 1943d8a7e3a7Sitojun case IFT_PROPVIRTUAL: 1944d8a7e3a7Sitojun case IFT_L2VLAN: 1945d8a7e3a7Sitojun case IFT_IEEE80211: 1946f4433d56Shenning case IFT_CARP: 1947d8a7e3a7Sitojun case IFT_GIF: /* XXX need more cases? */ 1948d8a7e3a7Sitojun return (1); 1949d8a7e3a7Sitojun default: 1950d8a7e3a7Sitojun return (0); 1951d8a7e3a7Sitojun } 1952d8a7e3a7Sitojun } 1953d8a7e3a7Sitojun 1954d8a7e3a7Sitojun int 1955287546eaSitojun nd6_storelladdr(ifp, rt, m, dst, desten) 1956287546eaSitojun struct ifnet *ifp; 1957287546eaSitojun struct rtentry *rt; 1958287546eaSitojun struct mbuf *m; 1959287546eaSitojun struct sockaddr *dst; 1960287546eaSitojun u_char *desten; 1961287546eaSitojun { 1962287546eaSitojun struct sockaddr_dl *sdl; 1963287546eaSitojun 1964287546eaSitojun if (m->m_flags & M_MCAST) { 1965287546eaSitojun switch (ifp->if_type) { 1966287546eaSitojun case IFT_ETHER: 1967287546eaSitojun case IFT_FDDI: 1968287546eaSitojun ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr, 1969287546eaSitojun desten); 1970287546eaSitojun return (1); 1971287546eaSitojun break; 1972287546eaSitojun default: 19730a2c5741Sitojun m_freem(m); 1974287546eaSitojun return (0); 1975287546eaSitojun } 1976287546eaSitojun } 1977287546eaSitojun 197872e30262Sitojun if (rt == NULL) { 197972e30262Sitojun /* this could happen, if we could not allocate memory */ 19800a2c5741Sitojun m_freem(m); 198172e30262Sitojun return (0); 198272e30262Sitojun } 198372e30262Sitojun if (rt->rt_gateway->sa_family != AF_LINK) { 1984287546eaSitojun printf("nd6_storelladdr: something odd happens\n"); 19850a2c5741Sitojun m_freem(m); 1986287546eaSitojun return (0); 1987287546eaSitojun } 1988287546eaSitojun sdl = SDL(rt->rt_gateway); 1989b4ee66fcSitojun if (sdl->sdl_alen == 0) { 1990bd2806bcSitojun /* this should be impossible, but we bark here for debugging */ 1991d8a7e3a7Sitojun printf("nd6_storelladdr: sdl_alen == 0, dst=%s, if=%s\n", 1992d8a7e3a7Sitojun ip6_sprintf(&SIN6(dst)->sin6_addr), ifp->if_xname); 19930a2c5741Sitojun m_freem(m); 1994b4ee66fcSitojun return (0); 1995b4ee66fcSitojun } 1996287546eaSitojun 1997b4ee66fcSitojun bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 1998287546eaSitojun return (1); 1999287546eaSitojun } 2000d8a7e3a7Sitojun 2001d8a7e3a7Sitojun int 2002d8a7e3a7Sitojun nd6_sysctl(name, oldp, oldlenp, newp, newlen) 2003d8a7e3a7Sitojun int name; 2004db3db419Sitojun void *oldp; /* syscall arg, need copyout */ 2005d8a7e3a7Sitojun size_t *oldlenp; 2006db3db419Sitojun void *newp; /* syscall arg, need copyin */ 2007d8a7e3a7Sitojun size_t newlen; 2008d8a7e3a7Sitojun { 2009db3db419Sitojun void *p; 2010d8a7e3a7Sitojun size_t ol, l; 2011d8a7e3a7Sitojun int error; 2012d8a7e3a7Sitojun 2013d8a7e3a7Sitojun error = 0; 2014d8a7e3a7Sitojun l = 0; 2015d8a7e3a7Sitojun 2016d8a7e3a7Sitojun if (newp) 2017d8a7e3a7Sitojun return EPERM; 2018d8a7e3a7Sitojun if (oldp && !oldlenp) 2019d8a7e3a7Sitojun return EINVAL; 2020d8a7e3a7Sitojun ol = oldlenp ? *oldlenp : 0; 2021d8a7e3a7Sitojun 2022db3db419Sitojun if (oldp) { 2023db3db419Sitojun p = malloc(*oldlenp, M_TEMP, M_WAITOK); 2024db3db419Sitojun if (!p) 2025db3db419Sitojun return ENOMEM; 2026db3db419Sitojun } else 2027db3db419Sitojun p = NULL; 2028d8a7e3a7Sitojun switch (name) { 2029d8a7e3a7Sitojun case ICMPV6CTL_ND6_DRLIST: 2030db3db419Sitojun error = fill_drlist(p, oldlenp, ol); 2031db3db419Sitojun if (!error && p && oldp) 2032732568ffSitojun error = copyout(p, oldp, *oldlenp); 2033d8a7e3a7Sitojun break; 2034d8a7e3a7Sitojun 2035d8a7e3a7Sitojun case ICMPV6CTL_ND6_PRLIST: 2036db3db419Sitojun error = fill_prlist(p, oldlenp, ol); 2037db3db419Sitojun if (!error && p && oldp) 2038732568ffSitojun error = copyout(p, oldp, *oldlenp); 2039d8a7e3a7Sitojun break; 2040d8a7e3a7Sitojun 2041d8a7e3a7Sitojun default: 2042d8a7e3a7Sitojun error = ENOPROTOOPT; 2043d8a7e3a7Sitojun break; 2044d8a7e3a7Sitojun } 2045db3db419Sitojun if (p) 2046db3db419Sitojun free(p, M_TEMP); 2047d8a7e3a7Sitojun 2048d8a7e3a7Sitojun return (error); 2049d8a7e3a7Sitojun } 2050d8a7e3a7Sitojun 2051d8a7e3a7Sitojun static int 2052d8a7e3a7Sitojun fill_drlist(oldp, oldlenp, ol) 2053d8a7e3a7Sitojun void *oldp; 2054d8a7e3a7Sitojun size_t *oldlenp, ol; 2055d8a7e3a7Sitojun { 2056d8a7e3a7Sitojun int error = 0, s; 2057d8a7e3a7Sitojun struct in6_defrouter *d = NULL, *de = NULL; 2058d8a7e3a7Sitojun struct nd_defrouter *dr; 2059d8a7e3a7Sitojun size_t l; 2060d8a7e3a7Sitojun 20616e92dee6Sitojun s = splsoftnet(); 2062d8a7e3a7Sitojun 2063d8a7e3a7Sitojun if (oldp) { 2064d8a7e3a7Sitojun d = (struct in6_defrouter *)oldp; 2065d8a7e3a7Sitojun de = (struct in6_defrouter *)((caddr_t)oldp + *oldlenp); 2066d8a7e3a7Sitojun } 2067d8a7e3a7Sitojun l = 0; 2068d8a7e3a7Sitojun 2069d8a7e3a7Sitojun for (dr = TAILQ_FIRST(&nd_defrouter); dr; 2070d8a7e3a7Sitojun dr = TAILQ_NEXT(dr, dr_entry)) { 2071d8a7e3a7Sitojun 2072d8a7e3a7Sitojun if (oldp && d + 1 <= de) { 2073d8a7e3a7Sitojun bzero(d, sizeof(*d)); 2074d8a7e3a7Sitojun d->rtaddr.sin6_family = AF_INET6; 2075d8a7e3a7Sitojun d->rtaddr.sin6_len = sizeof(struct sockaddr_in6); 2076d8a7e3a7Sitojun d->rtaddr.sin6_addr = dr->rtaddr; 2077d8a7e3a7Sitojun in6_recoverscope(&d->rtaddr, &d->rtaddr.sin6_addr, 2078d8a7e3a7Sitojun dr->ifp); 2079d8a7e3a7Sitojun d->flags = dr->flags; 2080d8a7e3a7Sitojun d->rtlifetime = dr->rtlifetime; 2081d8a7e3a7Sitojun d->expire = dr->expire; 2082d8a7e3a7Sitojun d->if_index = dr->ifp->if_index; 2083d8a7e3a7Sitojun } 2084d8a7e3a7Sitojun 2085d8a7e3a7Sitojun l += sizeof(*d); 2086d8a7e3a7Sitojun if (d) 2087d8a7e3a7Sitojun d++; 2088d8a7e3a7Sitojun } 2089d8a7e3a7Sitojun 2090d8a7e3a7Sitojun if (oldp) { 2091d8a7e3a7Sitojun *oldlenp = l; /* (caddr_t)d - (caddr_t)oldp */ 2092d8a7e3a7Sitojun if (l > ol) 2093d8a7e3a7Sitojun error = ENOMEM; 2094d8a7e3a7Sitojun } else 2095d8a7e3a7Sitojun *oldlenp = l; 2096d8a7e3a7Sitojun 2097d8a7e3a7Sitojun splx(s); 2098d8a7e3a7Sitojun 2099d8a7e3a7Sitojun return (error); 2100d8a7e3a7Sitojun } 2101d8a7e3a7Sitojun 2102d8a7e3a7Sitojun static int 2103d8a7e3a7Sitojun fill_prlist(oldp, oldlenp, ol) 2104d8a7e3a7Sitojun void *oldp; 2105d8a7e3a7Sitojun size_t *oldlenp, ol; 2106d8a7e3a7Sitojun { 2107d8a7e3a7Sitojun int error = 0, s; 2108d8a7e3a7Sitojun struct nd_prefix *pr; 2109d8a7e3a7Sitojun struct in6_prefix *p = NULL; 2110d8a7e3a7Sitojun struct in6_prefix *pe = NULL; 2111d8a7e3a7Sitojun size_t l; 2112d8a7e3a7Sitojun 21136e92dee6Sitojun s = splsoftnet(); 2114d8a7e3a7Sitojun 2115d8a7e3a7Sitojun if (oldp) { 2116d8a7e3a7Sitojun p = (struct in6_prefix *)oldp; 2117d8a7e3a7Sitojun pe = (struct in6_prefix *)((caddr_t)oldp + *oldlenp); 2118d8a7e3a7Sitojun } 2119d8a7e3a7Sitojun l = 0; 2120d8a7e3a7Sitojun 2121545205eaSpyr LIST_FOREACH(pr, &nd_prefix, ndpr_entry) { 2122d8a7e3a7Sitojun u_short advrtrs; 2123d8a7e3a7Sitojun size_t advance; 2124d8a7e3a7Sitojun struct sockaddr_in6 *sin6; 2125d8a7e3a7Sitojun struct sockaddr_in6 *s6; 2126d8a7e3a7Sitojun struct nd_pfxrouter *pfr; 2127d8a7e3a7Sitojun 2128d8a7e3a7Sitojun if (oldp && p + 1 <= pe) 2129d8a7e3a7Sitojun { 2130d8a7e3a7Sitojun bzero(p, sizeof(*p)); 2131d8a7e3a7Sitojun sin6 = (struct sockaddr_in6 *)(p + 1); 2132d8a7e3a7Sitojun 2133d8a7e3a7Sitojun p->prefix = pr->ndpr_prefix; 2134d8a7e3a7Sitojun if (in6_recoverscope(&p->prefix, 2135d8a7e3a7Sitojun &p->prefix.sin6_addr, pr->ndpr_ifp) != 0) 2136d8a7e3a7Sitojun log(LOG_ERR, 2137d8a7e3a7Sitojun "scope error in prefix list (%s)\n", 2138d8a7e3a7Sitojun ip6_sprintf(&p->prefix.sin6_addr)); 2139d8a7e3a7Sitojun p->raflags = pr->ndpr_raf; 2140d8a7e3a7Sitojun p->prefixlen = pr->ndpr_plen; 2141d8a7e3a7Sitojun p->vltime = pr->ndpr_vltime; 2142d8a7e3a7Sitojun p->pltime = pr->ndpr_pltime; 2143d8a7e3a7Sitojun p->if_index = pr->ndpr_ifp->if_index; 2144d8a7e3a7Sitojun if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME) 2145d8a7e3a7Sitojun p->expire = 0; 2146d8a7e3a7Sitojun else { 2147d8a7e3a7Sitojun time_t maxexpire; 2148d8a7e3a7Sitojun 2149d8a7e3a7Sitojun /* XXX: we assume time_t is signed. */ 2150d8a7e3a7Sitojun maxexpire = (-1) & 2151d8a7e3a7Sitojun ~(1 << ((sizeof(maxexpire) * 8) - 1)); 2152d8a7e3a7Sitojun if (pr->ndpr_vltime < 2153d8a7e3a7Sitojun maxexpire - pr->ndpr_lastupdate) { 2154d8a7e3a7Sitojun p->expire = pr->ndpr_lastupdate + 2155d8a7e3a7Sitojun pr->ndpr_vltime; 2156d8a7e3a7Sitojun } else 2157d8a7e3a7Sitojun p->expire = maxexpire; 2158d8a7e3a7Sitojun } 2159d8a7e3a7Sitojun p->refcnt = pr->ndpr_refcnt; 2160d8a7e3a7Sitojun p->flags = pr->ndpr_stateflags; 2161d8a7e3a7Sitojun p->origin = PR_ORIG_RA; 2162d8a7e3a7Sitojun advrtrs = 0; 2163545205eaSpyr LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) { 2164d8a7e3a7Sitojun if ((void *)&sin6[advrtrs + 1] > (void *)pe) { 2165d8a7e3a7Sitojun advrtrs++; 2166d8a7e3a7Sitojun continue; 2167d8a7e3a7Sitojun } 2168d8a7e3a7Sitojun s6 = &sin6[advrtrs]; 2169d8a7e3a7Sitojun s6->sin6_family = AF_INET6; 2170d8a7e3a7Sitojun s6->sin6_len = sizeof(struct sockaddr_in6); 2171d8a7e3a7Sitojun s6->sin6_addr = pfr->router->rtaddr; 2172d8a7e3a7Sitojun in6_recoverscope(s6, &pfr->router->rtaddr, 2173d8a7e3a7Sitojun pfr->router->ifp); 2174d8a7e3a7Sitojun advrtrs++; 2175d8a7e3a7Sitojun } 2176d8a7e3a7Sitojun p->advrtrs = advrtrs; 2177d8a7e3a7Sitojun } 2178d8a7e3a7Sitojun else { 2179d8a7e3a7Sitojun advrtrs = 0; 2180545205eaSpyr LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) 2181d8a7e3a7Sitojun advrtrs++; 2182d8a7e3a7Sitojun } 2183d8a7e3a7Sitojun 2184d8a7e3a7Sitojun advance = sizeof(*p) + sizeof(*sin6) * advrtrs; 2185d8a7e3a7Sitojun l += advance; 2186d8a7e3a7Sitojun if (p) 2187d8a7e3a7Sitojun p = (struct in6_prefix *)((caddr_t)p + advance); 2188d8a7e3a7Sitojun } 2189d8a7e3a7Sitojun 2190d8a7e3a7Sitojun if (oldp) { 2191d8a7e3a7Sitojun *oldlenp = l; /* (caddr_t)d - (caddr_t)oldp */ 2192d8a7e3a7Sitojun if (l > ol) 2193d8a7e3a7Sitojun error = ENOMEM; 2194d8a7e3a7Sitojun } else 2195d8a7e3a7Sitojun *oldlenp = l; 2196d8a7e3a7Sitojun 2197d8a7e3a7Sitojun splx(s); 2198d8a7e3a7Sitojun 2199d8a7e3a7Sitojun return (error); 2200d8a7e3a7Sitojun } 2201