nd6.c revision 151468
150276Speter/* $FreeBSD: head/sys/netinet6/nd6.c 151468 2005-10-19 15:05:42Z suz $ */ 2166124Srafan/* $KAME: nd6.c,v 1.144 2001/05/24 07:44:00 itojun Exp $ */ 350276Speter 450276Speter/*- 550276Speter * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 650276Speter * All rights reserved. 750276Speter * 850276Speter * Redistribution and use in source and binary forms, with or without 950276Speter * modification, are permitted provided that the following conditions 1050276Speter * are met: 1150276Speter * 1. Redistributions of source code must retain the above copyright 1250276Speter * notice, this list of conditions and the following disclaimer. 1350276Speter * 2. Redistributions in binary form must reproduce the above copyright 1450276Speter * notice, this list of conditions and the following disclaimer in the 1550276Speter * documentation and/or other materials provided with the distribution. 1650276Speter * 3. Neither the name of the project nor the names of its contributors 1750276Speter * may be used to endorse or promote products derived from this software 1850276Speter * without specific prior written permission. 1950276Speter * 2050276Speter * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 2150276Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2250276Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2350276Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2450276Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2550276Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2650276Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2750276Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2850276Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2950276Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3050276Speter * SUCH DAMAGE. 3150276Speter */ 32166124Srafan 3350276Speter#include "opt_inet.h" 3450276Speter#include "opt_inet6.h" 3550276Speter#include "opt_mac.h" 3650276Speter 3750276Speter#include <sys/param.h> 3850276Speter#include <sys/systm.h> 3950276Speter#include <sys/callout.h> 4050276Speter#include <sys/mac.h> 4150276Speter#include <sys/malloc.h> 4250276Speter#include <sys/mbuf.h> 4350276Speter#include <sys/socket.h> 4450276Speter#include <sys/sockio.h> 4550276Speter#include <sys/time.h> 4650276Speter#include <sys/kernel.h> 4750276Speter#include <sys/protosw.h> 4850276Speter#include <sys/errno.h> 4950276Speter#include <sys/syslog.h> 5050276Speter#include <sys/queue.h> 5150276Speter#include <sys/sysctl.h> 5250276Speter 5350276Speter#include <net/if.h> 5450276Speter#include <net/if_arc.h> 5550276Speter#include <net/if_dl.h> 5697049Speter#include <net/if_types.h> 5797049Speter#include <net/iso88025.h> 5850276Speter#include <net/fddi.h> 5950276Speter#include <net/route.h> 6050276Speter 61166124Srafan#include <netinet/in.h> 6250276Speter#include <netinet/if_ether.h> 6366963Speter#include <netinet6/in6_var.h> 6450276Speter#include <netinet/ip6.h> 6550276Speter#include <netinet6/ip6_var.h> 66166124Srafan#include <netinet6/scope6_var.h> 67166124Srafan#include <netinet6/nd6.h> 68166124Srafan#include <netinet/icmp6.h> 69166124Srafan 7050276Speter#include <net/net_osdep.h> 71166124Srafan 7297049Speter#define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */ 7397049Speter#define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */ 74166124Srafan 7597049Speter#define SIN6(s) ((struct sockaddr_in6 *)s) 7697049Speter#define SDL(s) ((struct sockaddr_dl *)s) 7797049Speter 7897049Speter/* timer values */ 7997049Speterint nd6_prune = 1; /* walk list every 1 seconds */ 8097049Speterint nd6_delay = 5; /* delay first probe time 5 second */ 8197049Speterint nd6_umaxtries = 3; /* maximum unicast query */ 8250276Speterint nd6_mmaxtries = 3; /* maximum multicast query */ 8350276Speterint nd6_useloopback = 1; /* use loopback interface for local traffic */ 8450276Speterint nd6_gctimer = (60 * 60 * 24); /* 1 day: garbage collection timer */ 8550276Speter 8650276Speter/* preventing too many loops in ND option parsing */ 8750276Speterint nd6_maxndopt = 10; /* max # of ND options allowed */ 8850276Speter 8950276Speterint nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */ 9050276Speter 9166963Speter#ifdef ND6_DEBUG 9266963Speterint nd6_debug = 1; 9350276Speter#else 9450276Speterint nd6_debug = 0; 9550276Speter#endif 9650276Speter 9750276Speter/* for debugging? */ 9850276Speterstatic int nd6_inuse, nd6_allocated; 9950276Speter 10050276Speterstruct llinfo_nd6 llinfo_nd6 = {&llinfo_nd6, &llinfo_nd6}; 10150276Speterstruct nd_drhead nd_defrouter; 10250276Speterstruct nd_prhead nd_prefix = { 0 }; 10350276Speter 10450276Speterint nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL; 10550276Speterstatic struct sockaddr_in6 all1_sa; 10650276Speter 10750276Speterstatic int nd6_is_new_addr_neighbor __P((struct sockaddr_in6 *, 10850276Speter struct ifnet *)); 10950276Speterstatic void nd6_setmtu0 __P((struct ifnet *, struct nd_ifinfo *)); 11050276Speterstatic void nd6_slowtimo __P((void *)); 11150276Speterstatic int regen_tmpaddr __P((struct in6_ifaddr *)); 11250276Speter 11350276Speterstruct callout nd6_slowtimo_ch; 11450276Speterstruct callout nd6_timer_ch; 11550276Speterextern struct callout in6_tmpaddrtimer_ch; 11650276Speter 11750276Spetervoid 11850276Speternd6_init() 11950276Speter{ 12050276Speter static int nd6_init_done = 0; 12150276Speter int i; 12250276Speter 12350276Speter if (nd6_init_done) { 12450276Speter log(LOG_NOTICE, "nd6_init called more than once(ignored)\n"); 12550276Speter return; 12650276Speter } 12750276Speter 12850276Speter all1_sa.sin6_family = AF_INET6; 12950276Speter all1_sa.sin6_len = sizeof(struct sockaddr_in6); 13050276Speter for (i = 0; i < sizeof(all1_sa.sin6_addr); i++) 13150276Speter all1_sa.sin6_addr.s6_addr[i] = 0xff; 13250276Speter 13350276Speter /* initialization of the default router list */ 13450276Speter TAILQ_INIT(&nd_defrouter); 13562449Speter 13650276Speter nd6_init_done = 1; 13762449Speter 13862449Speter /* start timer */ 13962449Speter callout_init(&nd6_slowtimo_ch, 0); 14050276Speter callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz, 14150276Speter nd6_slowtimo, NULL); 14250276Speter} 14350276Speter 14450276Speterstruct nd_ifinfo * 14550276Speternd6_ifattach(ifp) 14650276Speter struct ifnet *ifp; 14750276Speter{ 14850276Speter struct nd_ifinfo *nd; 14962449Speter 15062449Speter nd = (struct nd_ifinfo *)malloc(sizeof(*nd), M_IP6NDP, M_WAITOK); 15162449Speter bzero(nd, sizeof(*nd)); 15262449Speter 15350276Speter nd->initialized = 1; 15462449Speter 15562449Speter nd->chlim = IPV6_DEFHLIM; 15662449Speter nd->basereachable = REACHABLE_TIME; 15762449Speter nd->reachable = ND_COMPUTE_RTIME(nd->basereachable); 15862449Speter nd->retrans = RETRANS_TIMER; 15962449Speter /* 16062449Speter * Note that the default value of ip6_accept_rtadv is 0, which means 16162449Speter * we won't accept RAs by default even if we set ND6_IFF_ACCEPT_RTADV 16262449Speter * here. 16350276Speter */ 16450276Speter nd->flags = (ND6_IFF_PERFORMNUD | ND6_IFF_ACCEPT_RTADV); 16550276Speter 16650276Speter /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */ 16750276Speter nd6_setmtu0(ifp, nd); 16850276Speter 16950276Speter return nd; 17050276Speter} 17150276Speter 17250276Spetervoid 17350276Speternd6_ifdetach(nd) 17450276Speter struct nd_ifinfo *nd; 17550276Speter{ 17650276Speter 17750276Speter free(nd, M_IP6NDP); 17850276Speter} 17950276Speter 18062449Speter/* 18162449Speter * Reset ND level link MTU. This function is called when the physical MTU 18250276Speter * changes, which means we might have to adjust the ND level MTU. 18362449Speter */ 18462449Spetervoid 18562449Speternd6_setmtu(ifp) 18662449Speter struct ifnet *ifp; 18762449Speter{ 18862449Speter 18962449Speter nd6_setmtu0(ifp, ND_IFINFO(ifp)); 19050276Speter} 19162449Speter 19262449Speter/* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */ 19362449Spetervoid 19462449Speternd6_setmtu0(ifp, ndi) 19562449Speter struct ifnet *ifp; 19650276Speter struct nd_ifinfo *ndi; 19762449Speter{ 19862449Speter u_int32_t omaxmtu; 19962449Speter 20062449Speter omaxmtu = ndi->maxmtu; 20162449Speter 20262449Speter switch (ifp->if_type) { 20362449Speter case IFT_ARCNET: 20462449Speter ndi->maxmtu = MIN(ARC_PHDS_MAXMTU, ifp->if_mtu); /* RFC2497 */ 20562449Speter break; 20662449Speter case IFT_FDDI: 20762449Speter ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu); /* RFC2467 */ 20862449Speter break; 20962449Speter case IFT_ISO88025: 21050276Speter ndi->maxmtu = MIN(ISO88025_MAX_MTU, ifp->if_mtu); 21162449Speter break; 21262449Speter default: 21362449Speter ndi->maxmtu = ifp->if_mtu; 21462449Speter break; 21562449Speter } 21662449Speter 21750276Speter /* 21850276Speter * Decreasing the interface MTU under IPV6 minimum MTU may cause 21950276Speter * undesirable situation. We thus notify the operator of the change 22050276Speter * explicitly. The check for omaxmtu is necessary to restrict the 22150276Speter * log to the case of changing the MTU, not initializing it. 22250276Speter */ 22350276Speter if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) { 22450276Speter log(LOG_NOTICE, "nd6_setmtu0: " 22550276Speter "new link MTU on %s (%lu) is too small for IPv6\n", 22650276Speter if_name(ifp), (unsigned long)ndi->maxmtu); 22750276Speter } 22850276Speter 22950276Speter if (ndi->maxmtu > in6_maxmtu) 23050276Speter in6_setmaxmtu(); /* check all interfaces just in case */ 231166124Srafan 23250276Speter#undef MIN 23350276Speter} 23450276Speter 23550276Spetervoid 23662449Speternd6_option_init(opt, icmp6len, ndopts) 23750276Speter void *opt; 23862449Speter int icmp6len; 23950276Speter union nd_opts *ndopts; 24050276Speter{ 24150276Speter 24250276Speter bzero(ndopts, sizeof(*ndopts)); 24350276Speter ndopts->nd_opts_search = (struct nd_opt_hdr *)opt; 24450276Speter ndopts->nd_opts_last 24550276Speter = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len); 24650276Speter 24750276Speter if (icmp6len == 0) { 24850276Speter ndopts->nd_opts_done = 1; 24950276Speter ndopts->nd_opts_search = NULL; 25050276Speter } 25150276Speter} 25250276Speter 25350276Speter/* 25450276Speter * Take one ND option. 25550276Speter */ 25650276Speterstruct nd_opt_hdr * 25750276Speternd6_option(ndopts) 25850276Speter union nd_opts *ndopts; 25950276Speter{ 26050276Speter struct nd_opt_hdr *nd_opt; 26150276Speter int olen; 26266963Speter 26366963Speter if (ndopts == NULL) 26466963Speter panic("ndopts == NULL in nd6_option"); 26566963Speter if (ndopts->nd_opts_last == NULL) 26666963Speter panic("uninitialized ndopts in nd6_option"); 26766963Speter if (ndopts->nd_opts_search == NULL) 26866963Speter return NULL; 26966963Speter if (ndopts->nd_opts_done) 27066963Speter return NULL; 27150276Speter 27262449Speter nd_opt = ndopts->nd_opts_search; 27362449Speter 27462449Speter /* make sure nd_opt_len is inside the buffer */ 27562449Speter if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) { 27662449Speter bzero(ndopts, sizeof(*ndopts)); 27762449Speter return NULL; 27850276Speter } 27962449Speter 28062449Speter olen = nd_opt->nd_opt_len << 3; 28162449Speter if (olen == 0) { 28262449Speter /* 28362449Speter * Message validation requires that all included 28462449Speter * options have a length that is greater than zero. 28562449Speter */ 28662449Speter bzero(ndopts, sizeof(*ndopts)); 28762449Speter return NULL; 28862449Speter } 28962449Speter 29062449Speter ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen); 29162449Speter if (ndopts->nd_opts_search > ndopts->nd_opts_last) { 29262449Speter /* option overruns the end of buffer, invalid */ 29362449Speter bzero(ndopts, sizeof(*ndopts)); 29462449Speter return NULL; 29562449Speter } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) { 29662449Speter /* reached the end of options chain */ 29762449Speter ndopts->nd_opts_done = 1; 29862449Speter ndopts->nd_opts_search = NULL; 29962449Speter } 30062449Speter return nd_opt; 30150276Speter} 30262449Speter 30350276Speter/* 30462449Speter * Parse multiple ND options. 30562449Speter * This function is much easier to use, for ND routines that do not need 30662449Speter * multiple options of the same type. 30762449Speter */ 30862449Speterint 30962449Speternd6_options(ndopts) 31050276Speter union nd_opts *ndopts; 31150276Speter{ 31262449Speter struct nd_opt_hdr *nd_opt; 31350276Speter int i = 0; 31462449Speter 31562449Speter if (ndopts == NULL) 31650276Speter panic("ndopts == NULL in nd6_options"); 31762449Speter if (ndopts->nd_opts_last == NULL) 31862449Speter panic("uninitialized ndopts in nd6_options"); 31962449Speter if (ndopts->nd_opts_search == NULL) 32062449Speter return 0; 32162449Speter 32262449Speter while (1) { 32366963Speter nd_opt = nd6_option(ndopts); 32462449Speter if (nd_opt == NULL && ndopts->nd_opts_last == NULL) { 32562449Speter /* 32662449Speter * Message validation requires that all included 32762449Speter * options have a length that is greater than zero. 32862449Speter */ 32962449Speter icmp6stat.icp6s_nd_badopt++; 33062449Speter bzero(ndopts, sizeof(*ndopts)); 33162449Speter return -1; 33262449Speter } 33350276Speter 33462449Speter if (nd_opt == NULL) 33562449Speter goto skip1; 33662449Speter 33762449Speter switch (nd_opt->nd_opt_type) { 33862449Speter case ND_OPT_SOURCE_LINKADDR: 33962449Speter case ND_OPT_TARGET_LINKADDR: 34062449Speter case ND_OPT_MTU: 34162449Speter case ND_OPT_REDIRECTED_HEADER: 34262449Speter if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { 34350276Speter nd6log((LOG_INFO, 34462449Speter "duplicated ND6 option found (type=%d)\n", 34562449Speter nd_opt->nd_opt_type)); 34662449Speter /* XXX bark? */ 34762449Speter } else { 34862449Speter ndopts->nd_opt_array[nd_opt->nd_opt_type] 34962449Speter = nd_opt; 35050276Speter } 35150276Speter break; 35262449Speter case ND_OPT_PREFIX_INFORMATION: 35362449Speter if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) { 35462449Speter ndopts->nd_opt_array[nd_opt->nd_opt_type] 35562449Speter = nd_opt; 35662449Speter } 35762449Speter ndopts->nd_opts_pi_end = 35862449Speter (struct nd_opt_prefix_info *)nd_opt; 35962449Speter break; 36062449Speter default: 36162449Speter /* 36262449Speter * Unknown options must be silently ignored, 36362449Speter * to accomodate future extension to the protocol. 36462449Speter */ 36562449Speter nd6log((LOG_DEBUG, 36662449Speter "nd6_options: unsupported option %d - " 36762449Speter "option ignored\n", nd_opt->nd_opt_type)); 36862449Speter } 36962449Speter 37062449Speterskip1: 37162449Speter i++; 37262449Speter if (i > nd6_maxndopt) { 37362449Speter icmp6stat.icp6s_nd_toomanyopt++; 37462449Speter nd6log((LOG_INFO, "too many loop in nd opt\n")); 37562449Speter break; 37662449Speter } 37762449Speter 37850276Speter if (ndopts->nd_opts_done) 37950276Speter break; 38062449Speter } 38162449Speter 38262449Speter return 0; 38362449Speter} 38462449Speter 38562449Speter/* 38662449Speter * ND6 timer routine to expire default route list and prefix list 38762449Speter */ 38850276Spetervoid 38962449Speternd6_timer(ignored_arg) 39062449Speter void *ignored_arg; 39162449Speter{ 39250276Speter int s; 39362449Speter struct llinfo_nd6 *ln; 39462449Speter struct nd_defrouter *dr; 39562449Speter struct nd_prefix *pr; 39650276Speter struct ifnet *ifp; 39762449Speter struct in6_ifaddr *ia6, *nia6; 39862449Speter struct in6_addrlifetime *lt6; 39962449Speter 40062449Speter s = splnet(); 40162449Speter callout_reset(&nd6_timer_ch, nd6_prune * hz, 40262449Speter nd6_timer, NULL); 40362449Speter 40462449Speter ln = llinfo_nd6.ln_next; 40562449Speter while (ln && ln != &llinfo_nd6) { 40662449Speter struct rtentry *rt; 40762449Speter struct sockaddr_in6 *dst; 40862449Speter struct llinfo_nd6 *next = ln->ln_next; 40962449Speter /* XXX: used for the DELAY case only: */ 41062449Speter struct nd_ifinfo *ndi = NULL; 41162449Speter 41250276Speter if ((rt = ln->ln_rt) == NULL) { 41362449Speter ln = next; 41462449Speter continue; 41562449Speter } 41662449Speter if ((ifp = rt->rt_ifp) == NULL) { 41762449Speter ln = next; 41850276Speter continue; 41962449Speter } 42062449Speter ndi = ND_IFINFO(ifp); 42162449Speter dst = (struct sockaddr_in6 *)rt_key(rt); 42262449Speter 42362449Speter if (ln->ln_expire > time_second) { 42450276Speter ln = next; 42562449Speter continue; 42662449Speter } 42762449Speter 42862449Speter /* sanity check */ 42962449Speter if (!rt) 43062449Speter panic("rt=0 in nd6_timer(ln=%p)", ln); 43162449Speter if (rt->rt_llinfo && (struct llinfo_nd6 *)rt->rt_llinfo != ln) 43262449Speter panic("rt_llinfo(%p) is not equal to ln(%p)", 43362449Speter rt->rt_llinfo, ln); 43462449Speter if (!dst) 43562449Speter panic("dst=0 in nd6_timer(ln=%p)", ln); 43662449Speter 43762449Speter switch (ln->ln_state) { 43862449Speter case ND6_LLINFO_INCOMPLETE: 43962449Speter if (ln->ln_asked < nd6_mmaxtries) { 44050276Speter ln->ln_asked++; 44162449Speter ln->ln_expire = time_second + 44262449Speter ND_IFINFO(ifp)->retrans / 1000; 44362449Speter nd6_ns_output(ifp, NULL, &dst->sin6_addr, 44450276Speter ln, 0); 44562449Speter } else { 44662449Speter struct mbuf *m = ln->ln_hold; 44762449Speter if (m) { 44862449Speter /* 44962449Speter * assuming every packet in ln_hold has 45062449Speter * the same IP header 45162449Speter */ 45262449Speter ln->ln_hold = NULL; 45362449Speter icmp6_error2(m, ICMP6_DST_UNREACH, 45462449Speter ICMP6_DST_UNREACH_ADDR, 0, 45550276Speter rt->rt_ifp); 45650276Speter } 45762449Speter next = nd6_free(rt); 45862449Speter } 45962449Speter break; 46062449Speter case ND6_LLINFO_REACHABLE: 46162449Speter if (ln->ln_expire) { 46262449Speter ln->ln_state = ND6_LLINFO_STALE; 46350276Speter ln->ln_expire = time_second + nd6_gctimer; 46462449Speter } 46562449Speter break; 46662449Speter 46762449Speter case ND6_LLINFO_STALE: 46862449Speter /* Garbage Collection(RFC 2461 5.3) */ 46950276Speter if (ln->ln_expire) 47062449Speter next = nd6_free(rt); 47162449Speter break; 47262449Speter 47362449Speter case ND6_LLINFO_DELAY: 47462449Speter if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) { 47562449Speter /* We need NUD */ 47662449Speter ln->ln_asked = 1; 47762449Speter ln->ln_state = ND6_LLINFO_PROBE; 47862449Speter ln->ln_expire = time_second + 47962449Speter ndi->retrans / 1000; 48062449Speter nd6_ns_output(ifp, &dst->sin6_addr, 48162449Speter &dst->sin6_addr, 48262449Speter ln, 0); 48362449Speter } else { 48450276Speter ln->ln_state = ND6_LLINFO_STALE; /* XXX */ 48562449Speter ln->ln_expire = time_second + nd6_gctimer; 48666963Speter } 48762449Speter break; 48862449Speter case ND6_LLINFO_PROBE: 48962449Speter if (ln->ln_asked < nd6_umaxtries) { 49062449Speter ln->ln_asked++; 49162449Speter ln->ln_expire = time_second + 49262449Speter ND_IFINFO(ifp)->retrans / 1000; 49362449Speter nd6_ns_output(ifp, &dst->sin6_addr, 49462449Speter &dst->sin6_addr, ln, 0); 49562449Speter } else { 49662449Speter next = nd6_free(rt); 49762449Speter } 49862449Speter break; 49962449Speter } 50062449Speter ln = next; 50162449Speter } 50262449Speter 50362449Speter /* expire default router list */ 50462449Speter dr = TAILQ_FIRST(&nd_defrouter); 50562449Speter while (dr) { 50662449Speter if (dr->expire && dr->expire < time_second) { 50750276Speter struct nd_defrouter *t; 50862449Speter t = TAILQ_NEXT(dr, dr_entry); 50962449Speter defrtrlist_del(dr); 51062449Speter dr = t; 51162449Speter } else { 51262449Speter dr = TAILQ_NEXT(dr, dr_entry); 51350276Speter } 51462449Speter } 51562449Speter 51662449Speter /* 51762449Speter * expire interface addresses. 51862449Speter * in the past the loop was inside prefix expiry processing. 51962449Speter * However, from a stricter speci-confrmance standpoint, we should 52050276Speter * rather separate address lifetimes and prefix lifetimes. 52162449Speter */ 52262449Speter addrloop: 52362449Speter for (ia6 = in6_ifaddr; ia6; ia6 = nia6) { 52462449Speter nia6 = ia6->ia_next; 52562449Speter /* check address lifetime */ 52662449Speter lt6 = &ia6->ia6_lifetime; 52762449Speter if (IFA6_IS_INVALID(ia6)) { 52862449Speter int regen = 0; 52950276Speter 53062449Speter /* 53162449Speter * If the expiring address is temporary, try 53262449Speter * regenerating a new one. This would be useful when 53362449Speter * we suspended a laptop PC, then turned it on after a 53462449Speter * period that could invalidate all temporary 53562449Speter * addresses. Although we may have to restart the 53662449Speter * loop (see below), it must be after purging the 53762449Speter * address. Otherwise, we'd see an infinite loop of 53862449Speter * regeneration. 53962449Speter */ 54062449Speter if (ip6_use_tempaddr && 54162449Speter (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 54262449Speter if (regen_tmpaddr(ia6) == 0) 54362449Speter regen = 1; 54462449Speter } 54562449Speter 54662449Speter in6_purgeaddr(&ia6->ia_ifa); 54750276Speter 54862449Speter if (regen) 54962449Speter goto addrloop; /* XXX: see below */ 55062449Speter } 55162449Speter if (IFA6_IS_DEPRECATED(ia6)) { 55262449Speter int oldflags = ia6->ia6_flags; 55362449Speter 55462449Speter ia6->ia6_flags |= IN6_IFF_DEPRECATED; 55562449Speter 55650276Speter /* 55762449Speter * If a temporary address has just become deprecated, 55862449Speter * regenerate a new one if possible. 55962449Speter */ 56062449Speter if (ip6_use_tempaddr && 56162449Speter (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 56250276Speter (oldflags & IN6_IFF_DEPRECATED) == 0) { 56362449Speter 56450276Speter if (regen_tmpaddr(ia6) == 0) { 56562449Speter /* 56662449Speter * A new temporary address is 56762449Speter * generated. 56862449Speter * XXX: this means the address chain 56962449Speter * has changed while we are still in 57062449Speter * the loop. Although the change 57162449Speter * would not cause disaster (because 57262449Speter * it's not a deletion, but an 57362449Speter * addition,) we'd rather restart the 57462449Speter * loop just for safety. Or does this 57562449Speter * significantly reduce performance?? 57650276Speter */ 57762449Speter goto addrloop; 57850276Speter } 57962449Speter } 58062449Speter } else { 58162449Speter /* 58262449Speter * A new RA might have made a deprecated address 58350276Speter * preferred. 58450276Speter */ 58550276Speter ia6->ia6_flags &= ~IN6_IFF_DEPRECATED; 58650276Speter } 58750276Speter } 58850276Speter 58950276Speter /* expire prefix list */ 59050276Speter pr = nd_prefix.lh_first; 59150276Speter while (pr) { 59262449Speter /* 59362449Speter * check prefix lifetime. 59450276Speter * since pltime is just for autoconf, pltime processing for 59562449Speter * prefix is not necessary. 59662449Speter */ 59762449Speter if (pr->ndpr_expire && pr->ndpr_expire < time_second) { 59862449Speter struct nd_prefix *t; 59962449Speter t = pr->ndpr_next; 60050276Speter 60162449Speter /* 60250276Speter * address expiration and prefix expiration are 60362449Speter * separate. NEVER perform in6_purgeaddr here. 60450276Speter */ 60562449Speter 60662449Speter prelist_remove(pr); 60762449Speter pr = t; 60862449Speter } else 60962449Speter pr = pr->ndpr_next; 61062449Speter } 61162449Speter splx(s); 61262449Speter} 61362449Speter 61450276Speterstatic int 61562449Speterregen_tmpaddr(ia6) 61662449Speter struct in6_ifaddr *ia6; /* deprecated/invalidated temporary address */ 61762449Speter{ 61862449Speter struct ifaddr *ifa; 61962449Speter struct ifnet *ifp; 62062449Speter struct in6_ifaddr *public_ifa6 = NULL; 62162449Speter 62262449Speter ifp = ia6->ia_ifa.ifa_ifp; 62362449Speter for (ifa = ifp->if_addrlist.tqh_first; ifa; 62450276Speter ifa = ifa->ifa_list.tqe_next) { 62562449Speter struct in6_ifaddr *it6; 62650276Speter 62750276Speter if (ifa->ifa_addr->sa_family != AF_INET6) 62850276Speter continue; 62950276Speter 63050276Speter it6 = (struct in6_ifaddr *)ifa; 63150276Speter 63250276Speter /* ignore no autoconf addresses. */ 63350276Speter if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0) 63462449Speter continue; 63562449Speter 63650276Speter /* ignore autoconf addresses with different prefixes. */ 63762449Speter if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr) 63850276Speter continue; 63962449Speter 64062449Speter /* 64162449Speter * Now we are looking at an autoconf address with the same 64262449Speter * prefix as ours. If the address is temporary and is still 64350276Speter * preferred, do not create another one. It would be rare, but 64462449Speter * could happen, for example, when we resume a laptop PC after 64550276Speter * a long period. 64650276Speter */ 64750276Speter if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 64850276Speter !IFA6_IS_DEPRECATED(it6)) { 64950276Speter public_ifa6 = NULL; 65050276Speter break; 65150276Speter } 65250276Speter 65350276Speter /* 65450276Speter * This is a public autoconf address that has the same prefix 65550276Speter * as ours. If it is preferred, keep it. We can't break the 65650276Speter * loop here, because there may be a still-preferred temporary 65750276Speter * address with the prefix. 65850276Speter */ 65950276Speter if (!IFA6_IS_DEPRECATED(it6)) 66050276Speter public_ifa6 = it6; 66150276Speter } 66250276Speter 66350276Speter if (public_ifa6 != NULL) { 66450276Speter int e; 66550276Speter 66650276Speter if ((e = in6_tmpifadd(public_ifa6, 0)) != 0) { 66750276Speter log(LOG_NOTICE, "regen_tmpaddr: failed to create a new" 66850276Speter " tmp addr,errno=%d\n", e); 66950276Speter return (-1); 67050276Speter } 67150276Speter return (0); 67250276Speter } 67350276Speter 67450276Speter return (-1); 67550276Speter} 67650276Speter 67750276Speter/* 67850276Speter * Nuke neighbor cache/prefix/default router management table, right before 67950276Speter * ifp goes away. 68050276Speter */ 68150276Spetervoid 68250276Speternd6_purge(ifp) 68350276Speter struct ifnet *ifp; 68450276Speter{ 68550276Speter struct llinfo_nd6 *ln, *nln; 68650276Speter struct nd_defrouter *dr, *ndr, drany; 68750276Speter struct nd_prefix *pr, *npr; 68850276Speter 68950276Speter /* Nuke default router list entries toward ifp */ 69050276Speter if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) { 69150276Speter /* 69250276Speter * The first entry of the list may be stored in 69350276Speter * the routing table, so we'll delete it later. 69450276Speter */ 69550276Speter for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = ndr) { 69650276Speter ndr = TAILQ_NEXT(dr, dr_entry); 69750276Speter if (dr->ifp == ifp) 69850276Speter defrtrlist_del(dr); 69950276Speter } 70050276Speter dr = TAILQ_FIRST(&nd_defrouter); 70150276Speter if (dr->ifp == ifp) 70250276Speter defrtrlist_del(dr); 70350276Speter } 70450276Speter 70562449Speter /* Nuke prefix list entries toward ifp */ 70662449Speter for (pr = nd_prefix.lh_first; pr; pr = npr) { 70762449Speter npr = pr->ndpr_next; 70862449Speter if (pr->ndpr_ifp == ifp) { 70950276Speter /* 71062449Speter * Previously, pr->ndpr_addr is removed as well, 71162449Speter * but I strongly believe we don't have to do it. 71262449Speter * nd6_purge() is only called from in6_ifdetach(), 71362449Speter * which removes all the associated interface addresses 71462449Speter * by itself. 71562449Speter * (jinmei@kame.net 20010129) 71662449Speter */ 717166124Srafan prelist_remove(pr); 71862449Speter } 71962449Speter } 72062449Speter 72162449Speter /* cancel default outgoing interface setting */ 72262449Speter if (nd6_defifindex == ifp->if_index) 72362449Speter nd6_setdefaultiface(0); 72450276Speter 72562449Speter if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */ 72662449Speter /* refresh default router list */ 72762449Speter bzero(&drany, sizeof(drany)); 72862449Speter defrouter_delreq(&drany, 0); 72962449Speter defrouter_select(); 73062449Speter } 731166124Srafan 73262449Speter /* 73350276Speter * Nuke neighbor cache entries for the ifp. 73462449Speter * Note that rt->rt_ifp may not be the same as ifp, 73550276Speter * due to KAME goto ours hack. See RTM_RESOLVE case in 73662449Speter * nd6_rtrequest(), and ip6_input(). 73762449Speter */ 73862449Speter ln = llinfo_nd6.ln_next; 73962449Speter while (ln && ln != &llinfo_nd6) { 74062449Speter struct rtentry *rt; 74162449Speter struct sockaddr_dl *sdl; 74250276Speter 74350276Speter nln = ln->ln_next; 74450276Speter rt = ln->ln_rt; 74550276Speter if (rt && rt->rt_gateway && 74650276Speter rt->rt_gateway->sa_family == AF_LINK) { 74762449Speter sdl = (struct sockaddr_dl *)rt->rt_gateway; 74850276Speter if (sdl->sdl_index == ifp->if_index) 74962449Speter nln = nd6_free(rt); 75062449Speter } 751166124Srafan ln = nln; 75262449Speter } 75362449Speter} 75450276Speter 75562449Speterstruct rtentry * 75662449Speternd6_lookup(addr6, create, ifp) 75762449Speter struct in6_addr *addr6; 75862449Speter int create; 75962449Speter struct ifnet *ifp; 76062449Speter{ 76162449Speter struct rtentry *rt; 76250276Speter struct sockaddr_in6 sin6; 76350276Speter 76450276Speter bzero(&sin6, sizeof(sin6)); 76550276Speter sin6.sin6_len = sizeof(struct sockaddr_in6); 76650276Speter sin6.sin6_family = AF_INET6; 76750276Speter sin6.sin6_addr = *addr6; 76850276Speter rt = rtalloc1((struct sockaddr *)&sin6, create, 0UL); 76950276Speter if (rt) { 77062449Speter if ((rt->rt_flags & RTF_LLINFO) == 0 && create) { 77150276Speter /* 77262449Speter * This is the case for the default route. 77362449Speter * If we want to create a neighbor cache for the 77476726Speter * address, we should free the route for the 77562449Speter * destination and allocate an interface route. 77662449Speter */ 77762449Speter RTFREE_LOCKED(rt); 77862449Speter rt = NULL; 77962449Speter } 78062449Speter } 781166124Srafan if (rt == NULL) { 78266963Speter if (create && ifp) { 78350276Speter int e; 78462449Speter 78562449Speter /* 78662449Speter * If no route is available and create is set, 78762449Speter * we allocate a host route for the destination 78876726Speter * and treat it like an interface route. 78950276Speter * This hack is necessary for a neighbor which can't 79062449Speter * be covered by our own prefix. 79162449Speter */ 79262449Speter struct ifaddr *ifa = 79362449Speter ifaof_ifpforaddr((struct sockaddr *)&sin6, ifp); 79462449Speter if (ifa == NULL) 79562449Speter return (NULL); 79662449Speter 79762449Speter /* 79862449Speter * Create a new route. RTF_LLINFO is necessary 79966963Speter * to create a Neighbor Cache entry for the 80066963Speter * destination in nd6_rtrequest which will be 80197049Speter * called in rtrequest via ifa->ifa_rtrequest. 802166124Srafan */ 80397049Speter if ((e = rtrequest(RTM_ADD, (struct sockaddr *)&sin6, 80466963Speter ifa->ifa_addr, (struct sockaddr *)&all1_sa, 80562449Speter (ifa->ifa_flags | RTF_HOST | RTF_LLINFO) & 80666963Speter ~RTF_CLONING, &rt)) != 0) { 80766963Speter log(LOG_ERR, 80866963Speter "nd6_lookup: failed to add route for a " 80966963Speter "neighbor(%s), errno=%d\n", 81066963Speter ip6_sprintf(addr6), e); 81166963Speter } 81266963Speter if (rt == NULL) 81366963Speter return (NULL); 81466963Speter RT_LOCK(rt); 81566963Speter if (rt->rt_llinfo) { 81697049Speter struct llinfo_nd6 *ln = 81797049Speter (struct llinfo_nd6 *)rt->rt_llinfo; 81850276Speter ln->ln_state = ND6_LLINFO_NOSTATE; 81966963Speter } 82066963Speter } else 82166963Speter return (NULL); 82250276Speter } 82362449Speter RT_LOCK_ASSERT(rt); 82462449Speter RT_REMREF(rt); 82576726Speter /* 82662449Speter * Validation for the entry. 82762449Speter * Note that the check for rt_llinfo is necessary because a cloned 82876726Speter * route from a parent route that has the L flag (e.g. the default 82962449Speter * route to a p2p interface) may have the flag, too, while the 83062449Speter * destination is not actually a neighbor. 83162449Speter * XXX: we can't use rt->rt_ifp to check for the interface, since 83262449Speter * it might be the loopback interface if the entry is for our 83362449Speter * own address on a non-loopback interface. Instead, we should 83462449Speter * use rt->rt_ifa->ifa_ifp, which would specify the REAL 83562449Speter * interface. 83662449Speter */ 83750276Speter if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 || 83862449Speter rt->rt_gateway->sa_family != AF_LINK || rt->rt_llinfo == NULL || 83962449Speter (ifp && rt->rt_ifa->ifa_ifp != ifp)) { 840166124Srafan if (create) { 84162449Speter nd6log((LOG_DEBUG, 84262449Speter "nd6_lookup: failed to lookup %s (if = %s)\n", 84350276Speter ip6_sprintf(addr6), 84462449Speter ifp ? if_name(ifp) : "unspec")); 84550276Speter } 84662449Speter RT_UNLOCK(rt); 84750276Speter return (NULL); 84862449Speter } 84962449Speter RT_UNLOCK(rt); /* XXX not ready to return rt locked */ 85062449Speter return (rt); 85162449Speter} 85262449Speter 85362449Speter/* 85462449Speter * Test whether a given IPv6 address is a neighbor or not, ignoring 85562449Speter * the actual neighbor cache. The neighbor cache is ignored in order 85662449Speter * to not reenter the routing code from within itself. 85750276Speter */ 85862449Speterstatic int 85962449Speternd6_is_new_addr_neighbor(addr, ifp) 86062449Speter struct sockaddr_in6 *addr; 86162449Speter struct ifnet *ifp; 86250276Speter{ 86362449Speter struct nd_prefix *pr; 86462449Speter 86562449Speter /* 86662449Speter * A link-local address is always a neighbor. 86762449Speter * XXX: a link does not necessarily specify a single interface. 86862449Speter */ 86950276Speter if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) { 87062449Speter struct sockaddr_in6 sin6_copy; 87162449Speter u_int32_t zone; 87262449Speter 87362449Speter /* 87462449Speter * We need sin6_copy since sa6_recoverscope() may modify the 87562449Speter * content (XXX). 87662449Speter */ 87762449Speter sin6_copy = *addr; 87862449Speter if (sa6_recoverscope(&sin6_copy)) 87962449Speter return (0); /* XXX: should be impossible */ 88062449Speter if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone)) 88150276Speter return (0); 88262449Speter if (sin6_copy.sin6_scope_id == zone) 88350276Speter return (1); 88462449Speter else 88562449Speter return (0); 88662449Speter } 88750276Speter 88862449Speter /* 88962449Speter * If the address matches one of our addresses, 89062449Speter * it should be a neighbor. 89162449Speter * If the address matches one of our on-link prefixes, it should be a 89262449Speter * neighbor. 893166124Srafan */ 894166124Srafan for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 895166124Srafan if (pr->ndpr_ifp != ifp) 896166124Srafan continue; 897166124Srafan 898166124Srafan if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) 899166124Srafan continue; 900166124Srafan 901166124Srafan if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr, 902166124Srafan &addr->sin6_addr, &pr->ndpr_mask)) 903166124Srafan return (1); 904166124Srafan } 90562449Speter 90662449Speter /* 907166124Srafan * If the default router list is empty, all addresses are regarded 90862449Speter * as on-link, and thus, as a neighbor. 90950276Speter * XXX: we restrict the condition to hosts, because routers usually do 91062449Speter * not have the "default router list". 91150276Speter */ 91250276Speter if (!ip6_forwarding && TAILQ_FIRST(&nd_defrouter) == NULL && 91350276Speter nd6_defifindex == ifp->if_index) { 91450276Speter return (1); 91550276Speter } 91650276Speter 91750276Speter return (0); 91850276Speter} 91950276Speter 92050276Speter 92150276Speter/* 92262449Speter * Detect if a given IPv6 address identifies a neighbor on a given link. 92362449Speter * XXX: should take care of the destination of a p2p link? 92450276Speter */ 92597049Speterint 92697049Speternd6_is_addr_neighbor(addr, ifp) 92797049Speter struct sockaddr_in6 *addr; 92862449Speter struct ifnet *ifp; 92997049Speter{ 93062449Speter 93197049Speter if (nd6_is_new_addr_neighbor(addr, ifp)) 93297049Speter return (1); 93362449Speter 93497049Speter /* 93597049Speter * Even if the address matches none of our addresses, it might be 93662449Speter * in the neighbor cache. 93750276Speter */ 93850276Speter if (nd6_lookup(&addr->sin6_addr, 0, ifp) != NULL) 93950276Speter return (1); 94050276Speter 94176726Speter return (0); 942166124Srafan} 94350276Speter 944166124Srafan/* 94562449Speter * Free an nd6 llinfo entry. 94650276Speter */ 94762449Speterstruct llinfo_nd6 * 94850276Speternd6_free(rt) 94950276Speter struct rtentry *rt; 95062449Speter{ 951166124Srafan struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo, *next; 95262449Speter struct in6_addr in6 = ((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 95362449Speter struct nd_defrouter *dr; 95450276Speter 95597049Speter /* 956166124Srafan * we used to have pfctlinput(PRC_HOSTDEAD) here. 957166124Srafan * even though it is not harmful, it was not really necessary. 958166124Srafan */ 959166124Srafan 960166124Srafan if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */ 961166124Srafan int s; 962166124Srafan s = splnet(); 963166124Srafan dr = defrouter_lookup(&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 964166124Srafan rt->rt_ifp); 96566963Speter 966166124Srafan if (ln->ln_router || dr) { 96762449Speter /* 96862449Speter * rt6_flush must be called whether or not the neighbor 96962449Speter * is in the Default Router List. 97062449Speter * See a corresponding comment in nd6_na_input(). 97162449Speter */ 97250276Speter rt6_flush(&in6, rt->rt_ifp); 973166124Srafan } 974166124Srafan 97550276Speter if (dr) { 97650276Speter /* 97750276Speter * Unreachablity of a router might affect the default 97862449Speter * router selection and on-link detection of advertised 97962449Speter * prefixes. 98050276Speter */ 98162449Speter 98262449Speter /* 98362449Speter * Temporarily fake the state to choose a new default 98462449Speter * router and to perform on-link determination of 98562449Speter * prefixes correctly. 98662449Speter * Below the state will be set correctly, 98762449Speter * or the entry itself will be deleted. 98862449Speter */ 98962449Speter ln->ln_state = ND6_LLINFO_INCOMPLETE; 99062449Speter 99162449Speter /* 99262449Speter * Since defrouter_select() does not affect the 99362449Speter * on-link determination and MIP6 needs the check 99462449Speter * before the default router selection, we perform 99562449Speter * the check now. 99662449Speter */ 99762449Speter pfxlist_onlink_check(); 99862449Speter 99962449Speter if (dr == TAILQ_FIRST(&nd_defrouter)) { 100062449Speter /* 100162449Speter * It is used as the current default router, 100262449Speter * so we have to move it to the end of the 100362449Speter * list and choose a new one. 100462449Speter * XXX: it is not very efficient if this is 100562449Speter * the only router. 100662449Speter */ 100762449Speter TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 100862449Speter TAILQ_INSERT_TAIL(&nd_defrouter, dr, dr_entry); 100962449Speter 101097049Speter defrouter_select(); 101162449Speter } 101297049Speter } 101362449Speter splx(s); 101462449Speter } 101597049Speter 101697049Speter /* 101797049Speter * Before deleting the entry, remember the next entry as the 101850276Speter * return value. We need this because pfxlist_onlink_check() above 101962449Speter * might have freed other entries (particularly the old next entry) as 102066963Speter * a side effect (XXX). 1021166124Srafan */ 102262449Speter next = ln->ln_next; 102397049Speter 102462449Speter /* 102562449Speter * Detach the route from the routing tree and the list of neighbor 102662449Speter * caches, and disable the route entry not to be used in already 102797049Speter * cached routes. 102897049Speter */ 102997049Speter rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0, 103050276Speter rt_mask(rt), 0, (struct rtentry **)0); 103197049Speter 103297049Speter return (next); 103397049Speter} 103497049Speter 103597049Speter/* 103697049Speter * Upper-layer reachability hint for Neighbor Unreachability Detection. 103797049Speter * 103897049Speter * XXX cost-effective methods? 103997049Speter */ 104062449Spetervoid 104150276Speternd6_nud_hint(rt, dst6, force) 104250276Speter struct rtentry *rt; 104350276Speter struct in6_addr *dst6; 104450276Speter int force; 104576726Speter{ 104662449Speter struct llinfo_nd6 *ln; 104762449Speter 104862449Speter /* 104962449Speter * If the caller specified "rt", use that. Otherwise, resolve the 105062449Speter * routing table by supplied "dst6". 105150276Speter */ 105262449Speter if (rt == NULL) { 105350276Speter if (dst6 == NULL) 105497049Speter return; 105597049Speter if ((rt = nd6_lookup(dst6, 0, NULL)) == NULL) 105697049Speter return; 105797049Speter } 1058166124Srafan 105997049Speter if ((rt->rt_flags & RTF_GATEWAY) != 0 || 106097049Speter (rt->rt_flags & RTF_LLINFO) == 0 || 106197049Speter rt->rt_llinfo == NULL || rt->rt_gateway == NULL || 106297049Speter rt->rt_gateway->sa_family != AF_LINK) { 106397049Speter /* This is not a host route. */ 106497049Speter return; 106597049Speter } 106697049Speter 106797049Speter ln = (struct llinfo_nd6 *)rt->rt_llinfo; 106897049Speter if (ln->ln_state < ND6_LLINFO_REACHABLE) 106997049Speter return; 107097049Speter 107197049Speter /* 107297049Speter * if we get upper-layer reachability confirmation many times, 107397049Speter * it is possible we have false information. 107497049Speter */ 107597049Speter if (!force) { 107697049Speter ln->ln_byhint++; 107797049Speter if (ln->ln_byhint > nd6_maxnudhint) 107897049Speter return; 107997049Speter } 108097049Speter 108197049Speter ln->ln_state = ND6_LLINFO_REACHABLE; 108297049Speter if (ln->ln_expire) 108397049Speter ln->ln_expire = time_second + 108497049Speter ND_IFINFO(rt->rt_ifp)->reachable; 108562449Speter} 108662449Speter 108762449Spetervoid 108850276Speternd6_rtrequest(req, rt, info) 108962449Speter int req; 109062449Speter struct rtentry *rt; 109162449Speter struct rt_addrinfo *info; /* xxx unused */ 109262449Speter{ 109362449Speter struct sockaddr *gate = rt->rt_gateway; 109462449Speter struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 109562449Speter static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 109650276Speter struct ifnet *ifp = rt->rt_ifp; 109762449Speter struct ifaddr *ifa; 109850276Speter 109962449Speter RT_LOCK_ASSERT(rt); 110097049Speter 110197049Speter if ((rt->rt_flags & RTF_GATEWAY) != 0) 110262449Speter return; 110350276Speter 110462449Speter if (nd6_need_cache(ifp) == 0 && (rt->rt_flags & RTF_HOST) == 0) { 110562449Speter /* 110662449Speter * This is probably an interface direct route for a link 110762449Speter * which does not need neighbor caches (e.g. fe80::%lo0/64). 110862449Speter * We do not need special treatment below for such a route. 110962449Speter * Moreover, the RTF_LLINFO flag which would be set below 111050276Speter * would annoy the ndp(8) command. 111162449Speter */ 111262449Speter return; 111350276Speter } 111462449Speter 111597049Speter if (req == RTM_RESOLVE && 111697049Speter (nd6_need_cache(ifp) == 0 || /* stf case */ 111750276Speter !nd6_is_new_addr_neighbor((struct sockaddr_in6 *)rt_key(rt), 111850276Speter ifp))) { 111962449Speter /* 1120166124Srafan * FreeBSD and BSD/OS often make a cloned host route based 112150276Speter * on a less-specific route (e.g. the default route). 112262449Speter * If the less specific route does not have a "gateway" 1123166124Srafan * (this is the case when the route just goes to a p2p or an 112450276Speter * stf interface), we'll mistakenly make a neighbor cache for 112562449Speter * the host route, and will see strange neighbor solicitation 112650276Speter * for the corresponding destination. In order to avoid the 112762449Speter * confusion, we check if the destination of the route is 112862449Speter * a neighbor in terms of neighbor discovery, and stop the 112950276Speter * process if not. Additionally, we remove the LLINFO flag 113062449Speter * so that ndp(8) will not try to get the neighbor information 113162449Speter * of the destination. 113262449Speter */ 1133166124Srafan rt->rt_flags &= ~RTF_LLINFO; 1134166124Srafan return; 113562449Speter } 113662449Speter 1137166124Srafan switch (req) { 1138166124Srafan case RTM_ADD: 113950276Speter /* 114062449Speter * There is no backward compatibility :) 114162449Speter * 114262449Speter * if ((rt->rt_flags & RTF_HOST) == 0 && 114362449Speter * SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) 114462449Speter * rt->rt_flags |= RTF_CLONING; 114562449Speter */ 114662449Speter if (rt->rt_flags & (RTF_CLONING | RTF_LLINFO)) { 114762449Speter /* 114862449Speter * Case 1: This route should come from 114962449Speter * a route to interface. RTF_LLINFO flag is set 115062449Speter * for a host route whose destination should be 115162449Speter * treated as on-link. 115250276Speter */ 115362449Speter rt_setgate(rt, rt_key(rt), 115450276Speter (struct sockaddr *)&null_sdl); 1155166124Srafan gate = rt->rt_gateway; 115662449Speter SDL(gate)->sdl_type = ifp->if_type; 115762449Speter SDL(gate)->sdl_index = ifp->if_index; 115862449Speter if (ln) 115950276Speter ln->ln_expire = time_second; 116062449Speter if (ln && ln->ln_expire == 0) { 116162449Speter /* kludge for desktops */ 116250276Speter ln->ln_expire = 1; 116350276Speter } 116462449Speter if ((rt->rt_flags & RTF_CLONING) != 0) 116550276Speter break; 116650276Speter } 116776726Speter /* 116876726Speter * In IPv4 code, we try to annonuce new RTF_ANNOUNCE entry here. 116976726Speter * We don't do that here since llinfo is not ready yet. 117076726Speter * 117162449Speter * There are also couple of other things to be discussed: 117262449Speter * - unsolicited NA code needs improvement beforehand 117362449Speter * - RFC2461 says we MAY send multicast unsolicited NA 117462449Speter * (7.2.6 paragraph 4), however, it also says that we 1175 * SHOULD provide a mechanism to prevent multicast NA storm. 1176 * we don't have anything like it right now. 1177 * note that the mechanism needs a mutual agreement 1178 * between proxies, which means that we need to implement 1179 * a new protocol, or a new kludge. 1180 * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA. 1181 * we need to check ip6forwarding before sending it. 1182 * (or should we allow proxy ND configuration only for 1183 * routers? there's no mention about proxy ND from hosts) 1184 */ 1185#if 0 1186 /* XXX it does not work */ 1187 if (rt->rt_flags & RTF_ANNOUNCE) 1188 nd6_na_output(ifp, 1189 &SIN6(rt_key(rt))->sin6_addr, 1190 &SIN6(rt_key(rt))->sin6_addr, 1191 ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, 1192 1, NULL); 1193#endif 1194 /* FALLTHROUGH */ 1195 case RTM_RESOLVE: 1196 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) { 1197 /* 1198 * Address resolution isn't necessary for a point to 1199 * point link, so we can skip this test for a p2p link. 1200 */ 1201 if (gate->sa_family != AF_LINK || 1202 gate->sa_len < sizeof(null_sdl)) { 1203 log(LOG_DEBUG, 1204 "nd6_rtrequest: bad gateway value: %s\n", 1205 if_name(ifp)); 1206 break; 1207 } 1208 SDL(gate)->sdl_type = ifp->if_type; 1209 SDL(gate)->sdl_index = ifp->if_index; 1210 } 1211 if (ln != NULL) 1212 break; /* This happens on a route change */ 1213 /* 1214 * Case 2: This route may come from cloning, or a manual route 1215 * add with a LL address. 1216 */ 1217 R_Malloc(ln, struct llinfo_nd6 *, sizeof(*ln)); 1218 rt->rt_llinfo = (caddr_t)ln; 1219 if (ln == NULL) { 1220 log(LOG_DEBUG, "nd6_rtrequest: malloc failed\n"); 1221 break; 1222 } 1223 nd6_inuse++; 1224 nd6_allocated++; 1225 bzero(ln, sizeof(*ln)); 1226 ln->ln_rt = rt; 1227 /* this is required for "ndp" command. - shin */ 1228 if (req == RTM_ADD) { 1229 /* 1230 * gate should have some valid AF_LINK entry, 1231 * and ln->ln_expire should have some lifetime 1232 * which is specified by ndp command. 1233 */ 1234 ln->ln_state = ND6_LLINFO_REACHABLE; 1235 ln->ln_byhint = 0; 1236 } else { 1237 /* 1238 * When req == RTM_RESOLVE, rt is created and 1239 * initialized in rtrequest(), so rt_expire is 0. 1240 */ 1241 ln->ln_state = ND6_LLINFO_NOSTATE; 1242 ln->ln_expire = time_second; 1243 } 1244 rt->rt_flags |= RTF_LLINFO; 1245 ln->ln_next = llinfo_nd6.ln_next; 1246 llinfo_nd6.ln_next = ln; 1247 ln->ln_prev = &llinfo_nd6; 1248 ln->ln_next->ln_prev = ln; 1249 1250 /* 1251 * check if rt_key(rt) is one of my address assigned 1252 * to the interface. 1253 */ 1254 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp, 1255 &SIN6(rt_key(rt))->sin6_addr); 1256 if (ifa) { 1257 caddr_t macp = nd6_ifptomac(ifp); 1258 ln->ln_expire = 0; 1259 ln->ln_state = ND6_LLINFO_REACHABLE; 1260 ln->ln_byhint = 0; 1261 if (macp) { 1262 bcopy(macp, LLADDR(SDL(gate)), ifp->if_addrlen); 1263 SDL(gate)->sdl_alen = ifp->if_addrlen; 1264 } 1265 if (nd6_useloopback) { 1266 rt->rt_ifp = &loif[0]; /* XXX */ 1267 /* 1268 * Make sure rt_ifa be equal to the ifaddr 1269 * corresponding to the address. 1270 * We need this because when we refer 1271 * rt_ifa->ia6_flags in ip6_input, we assume 1272 * that the rt_ifa points to the address instead 1273 * of the loopback address. 1274 */ 1275 if (ifa != rt->rt_ifa) { 1276 IFAFREE(rt->rt_ifa); 1277 IFAREF(ifa); 1278 rt->rt_ifa = ifa; 1279 } 1280 } 1281 } else if (rt->rt_flags & RTF_ANNOUNCE) { 1282 ln->ln_expire = 0; 1283 ln->ln_state = ND6_LLINFO_REACHABLE; 1284 ln->ln_byhint = 0; 1285 1286 /* join solicited node multicast for proxy ND */ 1287 if (ifp->if_flags & IFF_MULTICAST) { 1288 struct in6_addr llsol; 1289 int error; 1290 1291 llsol = SIN6(rt_key(rt))->sin6_addr; 1292 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 1293 llsol.s6_addr32[1] = 0; 1294 llsol.s6_addr32[2] = htonl(1); 1295 llsol.s6_addr8[12] = 0xff; 1296 if (in6_setscope(&llsol, ifp, NULL)) 1297 break; 1298 if (!in6_addmulti(&llsol, ifp, &error)) { 1299 nd6log((LOG_ERR, "%s: failed to join " 1300 "%s (errno=%d)\n", if_name(ifp), 1301 ip6_sprintf(&llsol), error)); 1302 } 1303 } 1304 } 1305 break; 1306 1307 case RTM_DELETE: 1308 if (ln == NULL) 1309 break; 1310 /* leave from solicited node multicast for proxy ND */ 1311 if ((rt->rt_flags & RTF_ANNOUNCE) != 0 && 1312 (ifp->if_flags & IFF_MULTICAST) != 0) { 1313 struct in6_addr llsol; 1314 struct in6_multi *in6m; 1315 1316 llsol = SIN6(rt_key(rt))->sin6_addr; 1317 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 1318 llsol.s6_addr32[1] = 0; 1319 llsol.s6_addr32[2] = htonl(1); 1320 llsol.s6_addr8[12] = 0xff; 1321 if (in6_setscope(&llsol, ifp, NULL) == 0) { 1322 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1323 if (in6m) 1324 in6_delmulti(in6m); 1325 } else 1326 ; /* XXX: should not happen. bark here? */ 1327 } 1328 nd6_inuse--; 1329 ln->ln_next->ln_prev = ln->ln_prev; 1330 ln->ln_prev->ln_next = ln->ln_next; 1331 ln->ln_prev = NULL; 1332 rt->rt_llinfo = 0; 1333 rt->rt_flags &= ~RTF_LLINFO; 1334 if (ln->ln_hold) 1335 m_freem(ln->ln_hold); 1336 Free((caddr_t)ln); 1337 } 1338} 1339 1340int 1341nd6_ioctl(cmd, data, ifp) 1342 u_long cmd; 1343 caddr_t data; 1344 struct ifnet *ifp; 1345{ 1346 struct in6_drlist *drl = (struct in6_drlist *)data; 1347 struct in6_oprlist *oprl = (struct in6_oprlist *)data; 1348 struct in6_ndireq *ndi = (struct in6_ndireq *)data; 1349 struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data; 1350 struct in6_ndifreq *ndif = (struct in6_ndifreq *)data; 1351 struct nd_defrouter *dr, any; 1352 struct nd_prefix *pr; 1353 struct rtentry *rt; 1354 int i = 0, error = 0; 1355 int s; 1356 1357 switch (cmd) { 1358 case SIOCGDRLST_IN6: 1359 /* 1360 * obsolete API, use sysctl under net.inet6.icmp6 1361 */ 1362 bzero(drl, sizeof(*drl)); 1363 s = splnet(); 1364 dr = TAILQ_FIRST(&nd_defrouter); 1365 while (dr && i < DRLSTSIZ) { 1366 drl->defrouter[i].rtaddr = dr->rtaddr; 1367 in6_clearscope(&drl->defrouter[i].rtaddr); 1368 1369 drl->defrouter[i].flags = dr->flags; 1370 drl->defrouter[i].rtlifetime = dr->rtlifetime; 1371 drl->defrouter[i].expire = dr->expire; 1372 drl->defrouter[i].if_index = dr->ifp->if_index; 1373 i++; 1374 dr = TAILQ_NEXT(dr, dr_entry); 1375 } 1376 splx(s); 1377 break; 1378 case SIOCGPRLST_IN6: 1379 /* 1380 * obsolete API, use sysctl under net.inet6.icmp6 1381 * 1382 * XXX the structure in6_prlist was changed in backward- 1383 * incompatible manner. in6_oprlist is used for SIOCGPRLST_IN6, 1384 * in6_prlist is used for nd6_sysctl() - fill_prlist(). 1385 */ 1386 /* 1387 * XXX meaning of fields, especialy "raflags", is very 1388 * differnet between RA prefix list and RR/static prefix list. 1389 * how about separating ioctls into two? 1390 */ 1391 bzero(oprl, sizeof(*oprl)); 1392 s = splnet(); 1393 pr = nd_prefix.lh_first; 1394 while (pr && i < PRLSTSIZ) { 1395 struct nd_pfxrouter *pfr; 1396 int j; 1397 1398 oprl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr; 1399 oprl->prefix[i].raflags = pr->ndpr_raf; 1400 oprl->prefix[i].prefixlen = pr->ndpr_plen; 1401 oprl->prefix[i].vltime = pr->ndpr_vltime; 1402 oprl->prefix[i].pltime = pr->ndpr_pltime; 1403 oprl->prefix[i].if_index = pr->ndpr_ifp->if_index; 1404 oprl->prefix[i].expire = pr->ndpr_expire; 1405 1406 pfr = pr->ndpr_advrtrs.lh_first; 1407 j = 0; 1408 while (pfr) { 1409 if (j < DRLSTSIZ) { 1410#define RTRADDR oprl->prefix[i].advrtr[j] 1411 RTRADDR = pfr->router->rtaddr; 1412 in6_clearscope(&RTRADDR); 1413#undef RTRADDR 1414 } 1415 j++; 1416 pfr = pfr->pfr_next; 1417 } 1418 oprl->prefix[i].advrtrs = j; 1419 oprl->prefix[i].origin = PR_ORIG_RA; 1420 1421 i++; 1422 pr = pr->ndpr_next; 1423 } 1424 splx(s); 1425 1426 break; 1427 case OSIOCGIFINFO_IN6: 1428#define ND ndi->ndi 1429 /* XXX: old ndp(8) assumes a positive value for linkmtu. */ 1430 bzero(&ND, sizeof(ND)); 1431 ND.linkmtu = IN6_LINKMTU(ifp); 1432 ND.maxmtu = ND_IFINFO(ifp)->maxmtu; 1433 ND.basereachable = ND_IFINFO(ifp)->basereachable; 1434 ND.reachable = ND_IFINFO(ifp)->reachable; 1435 ND.retrans = ND_IFINFO(ifp)->retrans; 1436 ND.flags = ND_IFINFO(ifp)->flags; 1437 ND.recalctm = ND_IFINFO(ifp)->recalctm; 1438 ND.chlim = ND_IFINFO(ifp)->chlim; 1439 break; 1440 case SIOCGIFINFO_IN6: 1441 ND = *ND_IFINFO(ifp); 1442 ND.linkmtu = IN6_LINKMTU(ifp); 1443 break; 1444 case SIOCSIFINFO_IN6: 1445 /* 1446 * used to change host variables from userland. 1447 * intented for a use on router to reflect RA configurations. 1448 */ 1449 /* 0 means 'unspecified' */ 1450 if (ND.linkmtu != 0) { 1451 if (ND.linkmtu < IPV6_MMTU || 1452 ND.linkmtu > IN6_LINKMTU(ifp)) { 1453 error = EINVAL; 1454 break; 1455 } 1456 ND_IFINFO(ifp)->linkmtu = ND.linkmtu; 1457 } 1458 1459 if (ND.basereachable != 0) { 1460 int obasereachable = ND_IFINFO(ifp)->basereachable; 1461 1462 ND_IFINFO(ifp)->basereachable = ND.basereachable; 1463 if (ND.basereachable != obasereachable) 1464 ND_IFINFO(ifp)->reachable = 1465 ND_COMPUTE_RTIME(ND.basereachable); 1466 } 1467 if (ND.retrans != 0) 1468 ND_IFINFO(ifp)->retrans = ND.retrans; 1469 if (ND.chlim != 0) 1470 ND_IFINFO(ifp)->chlim = ND.chlim; 1471 /* FALLTHROUGH */ 1472 case SIOCSIFINFO_FLAGS: 1473 ND_IFINFO(ifp)->flags = ND.flags; 1474 break; 1475#undef ND 1476 case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */ 1477 /* flush default router list */ 1478 /* 1479 * xxx sumikawa: should not delete route if default 1480 * route equals to the top of default router list 1481 */ 1482 bzero(&any, sizeof(any)); 1483 defrouter_delreq(&any, 0); 1484 defrouter_select(); 1485 /* xxx sumikawa: flush prefix list */ 1486 break; 1487 case SIOCSPFXFLUSH_IN6: 1488 { 1489 /* flush all the prefix advertised by routers */ 1490 struct nd_prefix *pr, *next; 1491 1492 s = splnet(); 1493 for (pr = nd_prefix.lh_first; pr; pr = next) { 1494 struct in6_ifaddr *ia, *ia_next; 1495 1496 next = pr->ndpr_next; 1497 1498 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1499 continue; /* XXX */ 1500 1501 /* do we really have to remove addresses as well? */ 1502 for (ia = in6_ifaddr; ia; ia = ia_next) { 1503 /* ia might be removed. keep the next ptr. */ 1504 ia_next = ia->ia_next; 1505 1506 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1507 continue; 1508 1509 if (ia->ia6_ndpr == pr) 1510 in6_purgeaddr(&ia->ia_ifa); 1511 } 1512 prelist_remove(pr); 1513 } 1514 splx(s); 1515 break; 1516 } 1517 case SIOCSRTRFLUSH_IN6: 1518 { 1519 /* flush all the default routers */ 1520 struct nd_defrouter *dr, *next; 1521 1522 s = splnet(); 1523 if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) { 1524 /* 1525 * The first entry of the list may be stored in 1526 * the routing table, so we'll delete it later. 1527 */ 1528 for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = next) { 1529 next = TAILQ_NEXT(dr, dr_entry); 1530 defrtrlist_del(dr); 1531 } 1532 defrtrlist_del(TAILQ_FIRST(&nd_defrouter)); 1533 } 1534 splx(s); 1535 break; 1536 } 1537 case SIOCGNBRINFO_IN6: 1538 { 1539 struct llinfo_nd6 *ln; 1540 struct in6_addr nb_addr = nbi->addr; /* make local for safety */ 1541 1542 if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0) 1543 return (error); 1544 1545 s = splnet(); 1546 if ((rt = nd6_lookup(&nb_addr, 0, ifp)) == NULL) { 1547 error = EINVAL; 1548 splx(s); 1549 break; 1550 } 1551 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1552 nbi->state = ln->ln_state; 1553 nbi->asked = ln->ln_asked; 1554 nbi->isrouter = ln->ln_router; 1555 nbi->expire = ln->ln_expire; 1556 splx(s); 1557 1558 break; 1559 } 1560 case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1561 ndif->ifindex = nd6_defifindex; 1562 break; 1563 case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1564 return (nd6_setdefaultiface(ndif->ifindex)); 1565 } 1566 return (error); 1567} 1568 1569/* 1570 * Create neighbor cache entry and cache link-layer address, 1571 * on reception of inbound ND6 packets. (RS/RA/NS/redirect) 1572 */ 1573struct rtentry * 1574nd6_cache_lladdr(ifp, from, lladdr, lladdrlen, type, code) 1575 struct ifnet *ifp; 1576 struct in6_addr *from; 1577 char *lladdr; 1578 int lladdrlen; 1579 int type; /* ICMP6 type */ 1580 int code; /* type dependent information */ 1581{ 1582 struct rtentry *rt = NULL; 1583 struct llinfo_nd6 *ln = NULL; 1584 int is_newentry; 1585 struct sockaddr_dl *sdl = NULL; 1586 int do_update; 1587 int olladdr; 1588 int llchange; 1589 int newstate = 0; 1590 1591 if (ifp == NULL) 1592 panic("ifp == NULL in nd6_cache_lladdr"); 1593 if (from == NULL) 1594 panic("from == NULL in nd6_cache_lladdr"); 1595 1596 /* nothing must be updated for unspecified address */ 1597 if (IN6_IS_ADDR_UNSPECIFIED(from)) 1598 return NULL; 1599 1600 /* 1601 * Validation about ifp->if_addrlen and lladdrlen must be done in 1602 * the caller. 1603 * 1604 * XXX If the link does not have link-layer adderss, what should 1605 * we do? (ifp->if_addrlen == 0) 1606 * Spec says nothing in sections for RA, RS and NA. There's small 1607 * description on it in NS section (RFC 2461 7.2.3). 1608 */ 1609 1610 rt = nd6_lookup(from, 0, ifp); 1611 if (rt == NULL) { 1612#if 0 1613 /* nothing must be done if there's no lladdr */ 1614 if (!lladdr || !lladdrlen) 1615 return NULL; 1616#endif 1617 1618 rt = nd6_lookup(from, 1, ifp); 1619 is_newentry = 1; 1620 } else { 1621 /* do nothing if static ndp is set */ 1622 if (rt->rt_flags & RTF_STATIC) 1623 return NULL; 1624 is_newentry = 0; 1625 } 1626 1627 if (rt == NULL) 1628 return NULL; 1629 if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) { 1630fail: 1631 (void)nd6_free(rt); 1632 return NULL; 1633 } 1634 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1635 if (ln == NULL) 1636 goto fail; 1637 if (rt->rt_gateway == NULL) 1638 goto fail; 1639 if (rt->rt_gateway->sa_family != AF_LINK) 1640 goto fail; 1641 sdl = SDL(rt->rt_gateway); 1642 1643 olladdr = (sdl->sdl_alen) ? 1 : 0; 1644 if (olladdr && lladdr) { 1645 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 1646 llchange = 1; 1647 else 1648 llchange = 0; 1649 } else 1650 llchange = 0; 1651 1652 /* 1653 * newentry olladdr lladdr llchange (*=record) 1654 * 0 n n -- (1) 1655 * 0 y n -- (2) 1656 * 0 n y -- (3) * STALE 1657 * 0 y y n (4) * 1658 * 0 y y y (5) * STALE 1659 * 1 -- n -- (6) NOSTATE(= PASSIVE) 1660 * 1 -- y -- (7) * STALE 1661 */ 1662 1663 if (lladdr) { /* (3-5) and (7) */ 1664 /* 1665 * Record source link-layer address 1666 * XXX is it dependent to ifp->if_type? 1667 */ 1668 sdl->sdl_alen = ifp->if_addrlen; 1669 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 1670 } 1671 1672 if (!is_newentry) { 1673 if ((!olladdr && lladdr != NULL) || /* (3) */ 1674 (olladdr && lladdr != NULL && llchange)) { /* (5) */ 1675 do_update = 1; 1676 newstate = ND6_LLINFO_STALE; 1677 } else /* (1-2,4) */ 1678 do_update = 0; 1679 } else { 1680 do_update = 1; 1681 if (lladdr == NULL) /* (6) */ 1682 newstate = ND6_LLINFO_NOSTATE; 1683 else /* (7) */ 1684 newstate = ND6_LLINFO_STALE; 1685 } 1686 1687 if (do_update) { 1688 /* 1689 * Update the state of the neighbor cache. 1690 */ 1691 ln->ln_state = newstate; 1692 1693 if (ln->ln_state == ND6_LLINFO_STALE) { 1694 /* 1695 * XXX: since nd6_output() below will cause 1696 * state tansition to DELAY and reset the timer, 1697 * we must set the timer now, although it is actually 1698 * meaningless. 1699 */ 1700 ln->ln_expire = time_second + nd6_gctimer; 1701 1702 if (ln->ln_hold) { 1703 /* 1704 * we assume ifp is not a p2p here, so just 1705 * set the 2nd argument as the 1st one. 1706 */ 1707 nd6_output(ifp, ifp, ln->ln_hold, 1708 (struct sockaddr_in6 *)rt_key(rt), rt); 1709 ln->ln_hold = NULL; 1710 } 1711 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 1712 /* probe right away */ 1713 ln->ln_expire = time_second; 1714 } 1715 } 1716 1717 /* 1718 * ICMP6 type dependent behavior. 1719 * 1720 * NS: clear IsRouter if new entry 1721 * RS: clear IsRouter 1722 * RA: set IsRouter if there's lladdr 1723 * redir: clear IsRouter if new entry 1724 * 1725 * RA case, (1): 1726 * The spec says that we must set IsRouter in the following cases: 1727 * - If lladdr exist, set IsRouter. This means (1-5). 1728 * - If it is old entry (!newentry), set IsRouter. This means (7). 1729 * So, based on the spec, in (1-5) and (7) cases we must set IsRouter. 1730 * A quetion arises for (1) case. (1) case has no lladdr in the 1731 * neighbor cache, this is similar to (6). 1732 * This case is rare but we figured that we MUST NOT set IsRouter. 1733 * 1734 * newentry olladdr lladdr llchange NS RS RA redir 1735 * D R 1736 * 0 n n -- (1) c ? s 1737 * 0 y n -- (2) c s s 1738 * 0 n y -- (3) c s s 1739 * 0 y y n (4) c s s 1740 * 0 y y y (5) c s s 1741 * 1 -- n -- (6) c c c s 1742 * 1 -- y -- (7) c c s c s 1743 * 1744 * (c=clear s=set) 1745 */ 1746 switch (type & 0xff) { 1747 case ND_NEIGHBOR_SOLICIT: 1748 /* 1749 * New entry must have is_router flag cleared. 1750 */ 1751 if (is_newentry) /* (6-7) */ 1752 ln->ln_router = 0; 1753 break; 1754 case ND_REDIRECT: 1755 /* 1756 * If the icmp is a redirect to a better router, always set the 1757 * is_router flag. Otherwise, if the entry is newly created, 1758 * clear the flag. [RFC 2461, sec 8.3] 1759 */ 1760 if (code == ND_REDIRECT_ROUTER) 1761 ln->ln_router = 1; 1762 else if (is_newentry) /* (6-7) */ 1763 ln->ln_router = 0; 1764 break; 1765 case ND_ROUTER_SOLICIT: 1766 /* 1767 * is_router flag must always be cleared. 1768 */ 1769 ln->ln_router = 0; 1770 break; 1771 case ND_ROUTER_ADVERT: 1772 /* 1773 * Mark an entry with lladdr as a router. 1774 */ 1775 if ((!is_newentry && (olladdr || lladdr)) || /* (2-5) */ 1776 (is_newentry && lladdr)) { /* (7) */ 1777 ln->ln_router = 1; 1778 } 1779 break; 1780 } 1781 1782 /* 1783 * When the link-layer address of a router changes, select the 1784 * best router again. In particular, when the neighbor entry is newly 1785 * created, it might affect the selection policy. 1786 * Question: can we restrict the first condition to the "is_newentry" 1787 * case? 1788 * XXX: when we hear an RA from a new router with the link-layer 1789 * address option, defrouter_select() is called twice, since 1790 * defrtrlist_update called the function as well. However, I believe 1791 * we can compromise the overhead, since it only happens the first 1792 * time. 1793 * XXX: although defrouter_select() should not have a bad effect 1794 * for those are not autoconfigured hosts, we explicitly avoid such 1795 * cases for safety. 1796 */ 1797 if (do_update && ln->ln_router && !ip6_forwarding && ip6_accept_rtadv) 1798 defrouter_select(); 1799 1800 return rt; 1801} 1802 1803static void 1804nd6_slowtimo(ignored_arg) 1805 void *ignored_arg; 1806{ 1807 int s = splnet(); 1808 struct nd_ifinfo *nd6if; 1809 struct ifnet *ifp; 1810 1811 callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz, 1812 nd6_slowtimo, NULL); 1813 IFNET_RLOCK(); 1814 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 1815 nd6if = ND_IFINFO(ifp); 1816 if (nd6if->basereachable && /* already initialized */ 1817 (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) { 1818 /* 1819 * Since reachable time rarely changes by router 1820 * advertisements, we SHOULD insure that a new random 1821 * value gets recomputed at least once every few hours. 1822 * (RFC 2461, 6.3.4) 1823 */ 1824 nd6if->recalctm = nd6_recalc_reachtm_interval; 1825 nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable); 1826 } 1827 } 1828 IFNET_RUNLOCK(); 1829 splx(s); 1830} 1831 1832#define senderr(e) { error = (e); goto bad;} 1833int 1834nd6_output(ifp, origifp, m0, dst, rt0) 1835 struct ifnet *ifp; 1836 struct ifnet *origifp; 1837 struct mbuf *m0; 1838 struct sockaddr_in6 *dst; 1839 struct rtentry *rt0; 1840{ 1841 struct mbuf *m = m0; 1842 struct rtentry *rt = rt0; 1843 struct sockaddr_in6 *gw6 = NULL; 1844 struct llinfo_nd6 *ln = NULL; 1845 int error = 0; 1846 1847 if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr)) 1848 goto sendpkt; 1849 1850 if (nd6_need_cache(ifp) == 0) 1851 goto sendpkt; 1852 1853 /* 1854 * next hop determination. This routine is derived from ether_output. 1855 */ 1856again: 1857 if (rt) { 1858 if ((rt->rt_flags & RTF_UP) == 0) { 1859 rt0 = rt = rtalloc1((struct sockaddr *)dst, 1, 0UL); 1860 if (rt != NULL) { 1861 RT_REMREF(rt); 1862 RT_UNLOCK(rt); 1863 if (rt->rt_ifp != ifp) 1864 /* 1865 * XXX maybe we should update ifp too, 1866 * but the original code didn't and I 1867 * don't know what is correct here. 1868 */ 1869 goto again; 1870 } else 1871 senderr(EHOSTUNREACH); 1872 } 1873 1874 if (rt->rt_flags & RTF_GATEWAY) { 1875 gw6 = (struct sockaddr_in6 *)rt->rt_gateway; 1876 1877 /* 1878 * We skip link-layer address resolution and NUD 1879 * if the gateway is not a neighbor from ND point 1880 * of view, regardless of the value of nd_ifinfo.flags. 1881 * The second condition is a bit tricky; we skip 1882 * if the gateway is our own address, which is 1883 * sometimes used to install a route to a p2p link. 1884 */ 1885 if (!nd6_is_addr_neighbor(gw6, ifp) || 1886 in6ifa_ifpwithaddr(ifp, &gw6->sin6_addr)) { 1887 /* 1888 * We allow this kind of tricky route only 1889 * when the outgoing interface is p2p. 1890 * XXX: we may need a more generic rule here. 1891 */ 1892 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1893 senderr(EHOSTUNREACH); 1894 1895 goto sendpkt; 1896 } 1897 1898 if (rt->rt_gwroute == 0) 1899 goto lookup; 1900 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 1901 RT_LOCK(rt); 1902 rtfree(rt); rt = rt0; 1903 lookup: 1904 rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 0UL); 1905 if ((rt = rt->rt_gwroute) == 0) 1906 senderr(EHOSTUNREACH); 1907 RT_UNLOCK(rt); 1908 } 1909 } 1910 } 1911 1912 /* 1913 * Address resolution or Neighbor Unreachability Detection 1914 * for the next hop. 1915 * At this point, the destination of the packet must be a unicast 1916 * or an anycast address(i.e. not a multicast). 1917 */ 1918 1919 /* Look up the neighbor cache for the nexthop */ 1920 if (rt && (rt->rt_flags & RTF_LLINFO) != 0) 1921 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1922 else { 1923 /* 1924 * Since nd6_is_addr_neighbor() internally calls nd6_lookup(), 1925 * the condition below is not very efficient. But we believe 1926 * it is tolerable, because this should be a rare case. 1927 */ 1928 if (nd6_is_addr_neighbor(dst, ifp) && 1929 (rt = nd6_lookup(&dst->sin6_addr, 1, ifp)) != NULL) 1930 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1931 } 1932 if (ln == NULL || rt == NULL) { 1933 if ((ifp->if_flags & IFF_POINTOPOINT) == 0 && 1934 !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) { 1935 log(LOG_DEBUG, 1936 "nd6_output: can't allocate llinfo for %s " 1937 "(ln=%p, rt=%p)\n", 1938 ip6_sprintf(&dst->sin6_addr), ln, rt); 1939 senderr(EIO); /* XXX: good error? */ 1940 } 1941 1942 goto sendpkt; /* send anyway */ 1943 } 1944 1945 /* We don't have to do link-layer address resolution on a p2p link. */ 1946 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1947 ln->ln_state < ND6_LLINFO_REACHABLE) { 1948 ln->ln_state = ND6_LLINFO_STALE; 1949 ln->ln_expire = time_second + nd6_gctimer; 1950 } 1951 1952 /* 1953 * The first time we send a packet to a neighbor whose entry is 1954 * STALE, we have to change the state to DELAY and a sets a timer to 1955 * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do 1956 * neighbor unreachability detection on expiration. 1957 * (RFC 2461 7.3.3) 1958 */ 1959 if (ln->ln_state == ND6_LLINFO_STALE) { 1960 ln->ln_asked = 0; 1961 ln->ln_state = ND6_LLINFO_DELAY; 1962 ln->ln_expire = time_second + nd6_delay; 1963 } 1964 1965 /* 1966 * If the neighbor cache entry has a state other than INCOMPLETE 1967 * (i.e. its link-layer address is already resolved), just 1968 * send the packet. 1969 */ 1970 if (ln->ln_state > ND6_LLINFO_INCOMPLETE) 1971 goto sendpkt; 1972 1973 /* 1974 * There is a neighbor cache entry, but no ethernet address 1975 * response yet. Replace the held mbuf (if any) with this 1976 * latest one. 1977 * 1978 * This code conforms to the rate-limiting rule described in Section 1979 * 7.2.2 of RFC 2461, because the timer is set correctly after sending 1980 * an NS below. 1981 */ 1982 if (ln->ln_state == ND6_LLINFO_NOSTATE) 1983 ln->ln_state = ND6_LLINFO_INCOMPLETE; 1984 if (ln->ln_hold) 1985 m_freem(ln->ln_hold); 1986 ln->ln_hold = m; 1987 if (ln->ln_expire) { 1988 if (ln->ln_asked < nd6_mmaxtries && 1989 ln->ln_expire < time_second) { 1990 ln->ln_asked++; 1991 ln->ln_expire = time_second + 1992 ND_IFINFO(ifp)->retrans / 1000; 1993 nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 1994 } 1995 } 1996 return (0); 1997 1998 sendpkt: 1999#ifdef IPSEC 2000 /* clean ipsec history once it goes out of the node */ 2001 ipsec_delaux(m); 2002#endif 2003 2004#ifdef MAC 2005 mac_create_mbuf_linklayer(ifp, m); 2006#endif 2007 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 2008 return ((*ifp->if_output)(origifp, m, (struct sockaddr *)dst, 2009 rt)); 2010 } 2011 return ((*ifp->if_output)(ifp, m, (struct sockaddr *)dst, rt)); 2012 2013 bad: 2014 if (m) 2015 m_freem(m); 2016 return (error); 2017} 2018#undef senderr 2019 2020int 2021nd6_need_cache(ifp) 2022 struct ifnet *ifp; 2023{ 2024 /* 2025 * XXX: we currently do not make neighbor cache on any interface 2026 * other than ARCnet, Ethernet, FDDI and GIF. 2027 * 2028 * RFC2893 says: 2029 * - unidirectional tunnels needs no ND 2030 */ 2031 switch (ifp->if_type) { 2032 case IFT_ARCNET: 2033 case IFT_ETHER: 2034 case IFT_FDDI: 2035 case IFT_IEEE1394: 2036#ifdef IFT_L2VLAN 2037 case IFT_L2VLAN: 2038#endif 2039#ifdef IFT_IEEE80211 2040 case IFT_IEEE80211: 2041#endif 2042#ifdef IFT_CARP 2043 case IFT_CARP: 2044#endif 2045 case IFT_GIF: /* XXX need more cases? */ 2046 case IFT_BRIDGE: 2047 return (1); 2048 default: 2049 return (0); 2050 } 2051} 2052 2053int 2054nd6_storelladdr(ifp, rt0, m, dst, desten) 2055 struct ifnet *ifp; 2056 struct rtentry *rt0; 2057 struct mbuf *m; 2058 struct sockaddr *dst; 2059 u_char *desten; 2060{ 2061 struct sockaddr_dl *sdl; 2062 struct rtentry *rt; 2063 int error; 2064 2065 if (m->m_flags & M_MCAST) { 2066 int i; 2067 2068 switch (ifp->if_type) { 2069 case IFT_ETHER: 2070 case IFT_FDDI: 2071#ifdef IFT_L2VLAN 2072 case IFT_L2VLAN: 2073#endif 2074#ifdef IFT_IEEE80211 2075 case IFT_IEEE80211: 2076#endif 2077 case IFT_BRIDGE: 2078 case IFT_ISO88025: 2079 ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr, 2080 desten); 2081 return (0); 2082 case IFT_IEEE1394: 2083 /* 2084 * netbsd can use if_broadcastaddr, but we don't do so 2085 * to reduce # of ifdef. 2086 */ 2087 for (i = 0; i < ifp->if_addrlen; i++) 2088 desten[i] = ~0; 2089 return (0); 2090 case IFT_ARCNET: 2091 *desten = 0; 2092 return (0); 2093 default: 2094 m_freem(m); 2095 return (EAFNOSUPPORT); 2096 } 2097 } 2098 2099 if (rt0 == NULL) { 2100 /* this could happen, if we could not allocate memory */ 2101 m_freem(m); 2102 return (ENOMEM); 2103 } 2104 2105 error = rt_check(&rt, &rt0, dst); 2106 if (error) { 2107 m_freem(m); 2108 return (error); 2109 } 2110 RT_UNLOCK(rt); 2111 2112 if (rt->rt_gateway->sa_family != AF_LINK) { 2113 printf("nd6_storelladdr: something odd happens\n"); 2114 m_freem(m); 2115 return (EINVAL); 2116 } 2117 sdl = SDL(rt->rt_gateway); 2118 if (sdl->sdl_alen == 0) { 2119 /* this should be impossible, but we bark here for debugging */ 2120 printf("nd6_storelladdr: sdl_alen == 0\n"); 2121 m_freem(m); 2122 return (EINVAL); 2123 } 2124 2125 bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 2126 return (0); 2127} 2128 2129static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS); 2130static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS); 2131#ifdef SYSCTL_DECL 2132SYSCTL_DECL(_net_inet6_icmp6); 2133#endif 2134SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist, 2135 CTLFLAG_RD, nd6_sysctl_drlist, ""); 2136SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist, 2137 CTLFLAG_RD, nd6_sysctl_prlist, ""); 2138 2139static int 2140nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS) 2141{ 2142 int error; 2143 char buf[1024]; 2144 struct in6_defrouter *d, *de; 2145 struct nd_defrouter *dr; 2146 2147 if (req->newptr) 2148 return EPERM; 2149 error = 0; 2150 2151 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 2152 dr = TAILQ_NEXT(dr, dr_entry)) { 2153 d = (struct in6_defrouter *)buf; 2154 de = (struct in6_defrouter *)(buf + sizeof(buf)); 2155 2156 if (d + 1 <= de) { 2157 bzero(d, sizeof(*d)); 2158 d->rtaddr.sin6_family = AF_INET6; 2159 d->rtaddr.sin6_len = sizeof(d->rtaddr); 2160 d->rtaddr.sin6_addr = dr->rtaddr; 2161 if (sa6_recoverscope(&d->rtaddr)) { 2162 log(LOG_ERR, 2163 "scope error in router list (%s)\n", 2164 ip6_sprintf(&d->rtaddr.sin6_addr)); 2165 /* XXX: press on... */ 2166 } 2167 d->flags = dr->flags; 2168 d->rtlifetime = dr->rtlifetime; 2169 d->expire = dr->expire; 2170 d->if_index = dr->ifp->if_index; 2171 } else 2172 panic("buffer too short"); 2173 2174 error = SYSCTL_OUT(req, buf, sizeof(*d)); 2175 if (error) 2176 break; 2177 } 2178 2179 return (error); 2180} 2181 2182static int 2183nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS) 2184{ 2185 int error; 2186 char buf[1024]; 2187 struct in6_prefix *p, *pe; 2188 struct nd_prefix *pr; 2189 2190 if (req->newptr) 2191 return EPERM; 2192 error = 0; 2193 2194 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 2195 u_short advrtrs; 2196 size_t advance; 2197 struct sockaddr_in6 *sin6, *s6; 2198 struct nd_pfxrouter *pfr; 2199 2200 p = (struct in6_prefix *)buf; 2201 pe = (struct in6_prefix *)(buf + sizeof(buf)); 2202 2203 if (p + 1 <= pe) { 2204 bzero(p, sizeof(*p)); 2205 sin6 = (struct sockaddr_in6 *)(p + 1); 2206 2207 p->prefix = pr->ndpr_prefix; 2208 if (sa6_recoverscope(&p->prefix)) { 2209 log(LOG_ERR, 2210 "scope error in prefix list (%s)\n", 2211 ip6_sprintf(&p->prefix.sin6_addr)); 2212 /* XXX: press on... */ 2213 } 2214 p->raflags = pr->ndpr_raf; 2215 p->prefixlen = pr->ndpr_plen; 2216 p->vltime = pr->ndpr_vltime; 2217 p->pltime = pr->ndpr_pltime; 2218 p->if_index = pr->ndpr_ifp->if_index; 2219 p->expire = pr->ndpr_expire; 2220 p->refcnt = pr->ndpr_refcnt; 2221 p->flags = pr->ndpr_stateflags; 2222 p->origin = PR_ORIG_RA; 2223 advrtrs = 0; 2224 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; 2225 pfr = pfr->pfr_next) { 2226 if ((void *)&sin6[advrtrs + 1] > (void *)pe) { 2227 advrtrs++; 2228 continue; 2229 } 2230 s6 = &sin6[advrtrs]; 2231 bzero(s6, sizeof(*s6)); 2232 s6->sin6_family = AF_INET6; 2233 s6->sin6_len = sizeof(*sin6); 2234 s6->sin6_addr = pfr->router->rtaddr; 2235 if (sa6_recoverscope(s6)) { 2236 log(LOG_ERR, 2237 "scope error in " 2238 "prefix list (%s)\n", 2239 ip6_sprintf(&pfr->router->rtaddr)); 2240 } 2241 advrtrs++; 2242 } 2243 p->advrtrs = advrtrs; 2244 } else 2245 panic("buffer too short"); 2246 2247 advance = sizeof(*p) + sizeof(*sin6) * advrtrs; 2248 error = SYSCTL_OUT(req, buf, advance); 2249 if (error) 2250 break; 2251 } 2252 2253 return (error); 2254} 2255