X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/0b4e3aa066abc0728aacb4bbeb86f53f9737156e..21362eb3e66fd2c787aee132bce100a44d71a99c:/bsd/netinet6/nd6.c diff --git a/bsd/netinet6/nd6.c b/bsd/netinet6/nd6.c index 766b6c6e1..228c6fa2e 100644 --- a/bsd/netinet6/nd6.c +++ b/bsd/netinet6/nd6.c @@ -1,4 +1,5 @@ -/* $KAME: nd6.c,v 1.51.2.1 2000/04/13 11:59:29 jinmei Exp $ */ +/* $FreeBSD: src/sys/netinet6/nd6.c,v 1.20 2002/08/02 20:49:14 rwatson Exp $ */ +/* $KAME: nd6.c,v 1.144 2001/05/24 07:44:00 itojun Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. @@ -46,36 +47,22 @@ #include #include #include -#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) -#include -#endif #include #include #include +#include +#define DONT_WARN_OBSOLETE #include #include #include -#if !(defined(__bsdi__) && _BSDI_VERSION >= 199802) && !defined(__APPLE__) #include -#endif #include #include #include -#ifndef __NetBSD__ #include -#if __FreeBSD__ #include -#endif -#ifdef __bsdi__ -#include -#endif -#else /* __NetBSD__ */ -#include -#include -#include -#endif /* __NetBSD__ */ #include #include #include @@ -83,12 +70,7 @@ #include #include -#ifndef __bsdi__ #include "loop.h" -#endif -#if defined(__NetBSD__) || defined(__OpenBSD__) -extern struct ifnet loif[NLOOP]; -#endif #include @@ -104,14 +86,24 @@ int nd6_delay = 5; /* delay first probe time 5 second */ int nd6_umaxtries = 3; /* maximum unicast query */ int nd6_mmaxtries = 3; /* maximum multicast query */ int nd6_useloopback = 1; /* use loopback interface for local traffic */ +int nd6_gctimer = (60 * 60 * 24); /* 1 day: garbage collection timer */ /* preventing too many loops in ND option parsing */ int nd6_maxndopt = 10; /* max # of ND options allowed */ +int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */ + +#if ND6_DEBUG +int nd6_debug = 1; +#else +int nd6_debug = 0; +#endif + /* for debugging? */ static int nd6_inuse, nd6_allocated; struct llinfo_nd6 llinfo_nd6 = {&llinfo_nd6, &llinfo_nd6}; +size_t nd_ifinfo_indexlim = 8; struct nd_ifinfo *nd_ifinfo = NULL; struct nd_drhead nd_defrouter; struct nd_prhead nd_prefix = { 0 }; @@ -119,12 +111,12 @@ struct nd_prhead nd_prefix = { 0 }; int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL; static struct sockaddr_in6 all1_sa; -static void nd6_slowtimo __P((void *)); -static void nd6_slowtimo_funneled __P((void *)); +static int regen_tmpaddr(struct in6_ifaddr *); +extern lck_mtx_t *rt_mtx; +extern lck_mtx_t *ip6_mutex; +extern lck_mtx_t *nd6_mutex; -#if MIP6 -void (*mip6_expired_defrouter_hook)(struct nd_defrouter *dr) = 0; -#endif +static void nd6_slowtimo(void *ignored_arg); void nd6_init() @@ -148,38 +140,48 @@ nd6_init() nd6_init_done = 1; /* start timer */ - timeout(nd6_slowtimo_funneled, (caddr_t)0, ND6_SLOWTIMER_INTERVAL * hz); + timeout(nd6_slowtimo, (caddr_t)0, ND6_SLOWTIMER_INTERVAL * hz); } void -nd6_ifattach(ifp) - struct ifnet *ifp; +nd6_ifattach( + struct ifnet *ifp) { - static size_t if_indexlim = 8; /* * We have some arrays that should be indexed by if_index. * since if_index will grow dynamically, they should grow too. */ - if (nd_ifinfo == NULL || if_index >= if_indexlim) { + if (nd_ifinfo == NULL || if_index >= nd_ifinfo_indexlim) { size_t n; caddr_t q; - while (if_index >= if_indexlim) - if_indexlim <<= 1; + while (if_index >= nd_ifinfo_indexlim) + nd_ifinfo_indexlim <<= 1; /* grow nd_ifinfo */ - n = if_indexlim * sizeof(struct nd_ifinfo); + n = nd_ifinfo_indexlim * sizeof(struct nd_ifinfo); q = (caddr_t)_MALLOC(n, M_IP6NDP, M_WAITOK); bzero(q, n); if (nd_ifinfo) { bcopy((caddr_t)nd_ifinfo, q, n/2); - _FREE((caddr_t)nd_ifinfo, M_IP6NDP); + FREE((caddr_t)nd_ifinfo, M_IP6NDP); } nd_ifinfo = (struct nd_ifinfo *)q; } #define ND nd_ifinfo[ifp->if_index] + + /* + * Don't initialize if called twice. + * XXX: to detect this, we should choose a member that is never set + * before initialization of the ND structure itself. We formaly used + * the linkmtu member, which was not suitable because it could be + * initialized via "ifconfig mtu". + */ + if (ND.basereachable) + return; + ND.linkmtu = ifindex2ifnet[ifp->if_index]->if_mtu; ND.chlim = IPV6_DEFHLIM; ND.basereachable = REACHABLE_TIME; @@ -196,33 +198,55 @@ nd6_ifattach(ifp) * changes, which means we might have to adjust the ND level MTU. */ void -nd6_setmtu(ifp) - struct ifnet *ifp; +nd6_setmtu( + struct ifnet *ifp) { - struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; - u_long oldmaxmtu = ndi->maxmtu; - u_long oldlinkmtu = ndi->linkmtu; - - switch(ifp->if_type) { - case IFT_ARCNET: /* XXX MTU handling needs more work */ - ndi->maxmtu = MIN(60480, ifp->if_mtu); - break; - case IFT_ETHER: - ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu); - break; -#if defined(__FreeBSD__) || defined(__bsdi__) - case IFT_FDDI: - ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu); - break; +#ifndef MIN +#define MIN(a,b) ((a) < (b) ? (a) : (b)) #endif -#if !(defined(__bsdi__) && _BSDI_VERSION >= 199802) && !defined (__APPLE__) - case IFT_ATM: - ndi->maxmtu = MIN(ATMMTU, ifp->if_mtu); - break; + + struct nd_ifinfo *ndi; + u_long oldmaxmtu, oldlinkmtu; + + /* + * Make sure IPv6 is enabled for the interface first, + * because this can be called directly from SIOCSIFMTU for IPv4 + */ + + if (ifp->if_index >= nd_ifinfo_indexlim) { + return; /* we're out of bound for nd_ifinfo */ + } + + ndi = &nd_ifinfo[ifp->if_index]; + oldmaxmtu = ndi->maxmtu; + oldlinkmtu = ndi->linkmtu; + + switch (ifp->if_type) { + case IFT_ARCNET: /* XXX MTU handling needs more work */ + ndi->maxmtu = MIN(60480, ifp->if_mtu); + break; + case IFT_L2VLAN: /* XXX what if the VLAN isn't over ethernet? */ + case IFT_IEEE8023ADLAG: + case IFT_ETHER: + ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu); + break; + case IFT_FDDI: + ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu); + break; + case IFT_ATM: + ndi->maxmtu = MIN(ATMMTU, ifp->if_mtu); + break; + case IFT_IEEE1394: /* XXX should be IEEE1394MTU(1500) */ + ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu); + break; +#if IFT_IEEE80211 + case IFT_IEEE80211: /* XXX should be IEEE80211MTU(1500) */ + ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu); + break; #endif - default: - ndi->maxmtu = ifp->if_mtu; - break; + default: + ndi->maxmtu = ifp->if_mtu; + break; } if (oldmaxmtu != ndi->maxmtu) { @@ -244,8 +268,7 @@ nd6_setmtu(ifp) */ if (in6_maxmtu < ndi->linkmtu) in6_maxmtu = ndi->linkmtu; - } - else + } else in6_setmaxmtu(); } } @@ -253,10 +276,10 @@ nd6_setmtu(ifp) } void -nd6_option_init(opt, icmp6len, ndopts) - void *opt; - int icmp6len; - union nd_opts *ndopts; +nd6_option_init( + void *opt, + int icmp6len, + union nd_opts *ndopts) { bzero(ndopts, sizeof(*ndopts)); ndopts->nd_opts_search = (struct nd_opt_hdr *)opt; @@ -273,8 +296,8 @@ nd6_option_init(opt, icmp6len, ndopts) * Take one ND option. */ struct nd_opt_hdr * -nd6_option(ndopts) - union nd_opts *ndopts; +nd6_option( + union nd_opts *ndopts) { struct nd_opt_hdr *nd_opt; int olen; @@ -290,6 +313,12 @@ nd6_option(ndopts) nd_opt = ndopts->nd_opts_search; + /* make sure nd_opt_len is inside the buffer */ + if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) { + bzero(ndopts, sizeof(*ndopts)); + return NULL; + } + olen = nd_opt->nd_opt_len << 3; if (olen == 0) { /* @@ -301,7 +330,12 @@ nd6_option(ndopts) } ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen); - if (!(ndopts->nd_opts_search < ndopts->nd_opts_last)) { + if (ndopts->nd_opts_search > ndopts->nd_opts_last) { + /* option overruns the end of buffer, invalid */ + bzero(ndopts, sizeof(*ndopts)); + return NULL; + } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) { + /* reached the end of options chain */ ndopts->nd_opts_done = 1; ndopts->nd_opts_search = NULL; } @@ -314,8 +348,8 @@ nd6_option(ndopts) * multiple options of the same type. */ int -nd6_options(ndopts) - union nd_opts *ndopts; +nd6_options( + union nd_opts *ndopts) { struct nd_opt_hdr *nd_opt; int i = 0; @@ -334,6 +368,7 @@ nd6_options(ndopts) * Message validation requires that all included * options have a length that is greater than zero. */ + icmp6stat.icp6s_nd_badopt++; bzero(ndopts, sizeof(*ndopts)); return -1; } @@ -346,10 +381,10 @@ nd6_options(ndopts) case ND_OPT_TARGET_LINKADDR: case ND_OPT_MTU: case ND_OPT_REDIRECTED_HEADER: - case ND_OPT_ADV_INTERVAL: if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { - printf("duplicated ND6 option found " - "(type=%d)\n", nd_opt->nd_opt_type); + nd6log((LOG_INFO, + "duplicated ND6 option found (type=%d)\n", + nd_opt->nd_opt_type)); /* XXX bark? */ } else { ndopts->nd_opt_array[nd_opt->nd_opt_type] @@ -364,23 +399,21 @@ nd6_options(ndopts) ndopts->nd_opts_pi_end = (struct nd_opt_prefix_info *)nd_opt; break; - case ND_OPT_HA_INFORMATION: - break; default: /* * Unknown options must be silently ignored, * to accomodate future extension to the protocol. */ - log(LOG_DEBUG, + nd6log((LOG_DEBUG, "nd6_options: unsupported option %d - " - "option ignored\n", nd_opt->nd_opt_type); + "option ignored\n", nd_opt->nd_opt_type)); } skip1: i++; if (i > nd6_maxndopt) { icmp6stat.icp6s_nd_toomanyopt++; - printf("too many loop in nd opt\n"); + nd6log((LOG_INFO, "too many loop in nd opt\n")); break; } @@ -395,42 +428,24 @@ skip1: * ND6 timer routine to expire default route list and prefix list */ void -nd6_timer_funneled(ignored_arg) - void *ignored_arg; -{ -#ifdef __APPLE__ - boolean_t funnel_state; - funnel_state = thread_funnel_set(network_flock, TRUE); -#endif - nd6_timer(ignored_arg); -#ifdef __APPLE__ - (void) thread_funnel_set(network_flock, FALSE); -#endif -} -void -nd6_timer(ignored_arg) - void *ignored_arg; +nd6_timer( + void *ignored_arg) { - int s; - register struct llinfo_nd6 *ln; - register struct nd_defrouter *dr; - register struct nd_prefix *pr; -#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined (__APPLE__) - long time_second = time.tv_sec; -#endif + struct llinfo_nd6 *ln; + struct nd_defrouter *dr; + struct nd_prefix *pr; + struct ifnet *ifp = NULL; + struct in6_ifaddr *ia6, *nia6; + struct in6_addrlifetime *lt6; + struct timeval timenow; + + getmicrotime(&timenow); -#if __NetBSD__ - s = splsoftnet(); -#else - s = splnet(); -#endif - timeout(nd6_timer_funneled, (caddr_t)0, nd6_prune * hz); + ln = llinfo_nd6.ln_next; - /* XXX BSD/OS separates this code -- itojun */ while (ln && ln != &llinfo_nd6) { struct rtentry *rt; - struct ifnet *ifp; struct sockaddr_in6 *dst; struct llinfo_nd6 *next = ln->ln_next; /* XXX: used for the DELAY case only: */ @@ -447,30 +462,40 @@ nd6_timer(ignored_arg) ndi = &nd_ifinfo[ifp->if_index]; dst = (struct sockaddr_in6 *)rt_key(rt); - if (ln->ln_expire > time_second) { + if (ln->ln_expire > timenow.tv_sec) { ln = next; continue; } - + /* sanity check */ - if (!rt) - panic("rt=0 in nd6_timer(ln=%p)\n", ln); - if (rt->rt_llinfo && (struct llinfo_nd6 *)rt->rt_llinfo != ln) - panic("rt_llinfo(%p) is not equal to ln(%p)\n", + if (!rt) { + printf("rt=0 in nd6_timer(ln=%p)\n", ln); + ln = next; + continue; + } + if (rt->rt_llinfo && (struct llinfo_nd6 *)rt->rt_llinfo != ln) { + printf("rt_llinfo(%p) is not equal to ln(%p)\n", rt->rt_llinfo, ln); - if (!dst) - panic("dst=0 in nd6_timer(ln=%p)\n", ln); + ln = next; + continue; + } + if (!dst) { + printf("dst=0 in nd6_timer(ln=%p)\n", ln); + ln = next; + continue; + } switch (ln->ln_state) { case ND6_LLINFO_INCOMPLETE: if (ln->ln_asked < nd6_mmaxtries) { ln->ln_asked++; - ln->ln_expire = time_second + + ln->ln_expire = timenow.tv_sec + nd_ifinfo[ifp->if_index].retrans / 1000; nd6_ns_output(ifp, NULL, &dst->sin6_addr, - ln, 0); + ln, 0, 0); } else { struct mbuf *m = ln->ln_hold; + ln->ln_hold = NULL; if (m) { if (rt->rt_ifp) { /* @@ -486,113 +511,232 @@ nd6_timer(ignored_arg) ICMP6_DST_UNREACH_ADDR, 0); ln->ln_hold = NULL; } - nd6_free(rt); + next = nd6_free(rt); } break; case ND6_LLINFO_REACHABLE: - if (ln->ln_expire) + if (ln->ln_expire) { ln->ln_state = ND6_LLINFO_STALE; + ln->ln_expire = timenow.tv_sec + nd6_gctimer; + } break; - /* - * ND6_LLINFO_STALE state requires nothing for timer - * routine. - */ + + case ND6_LLINFO_STALE: + /* Garbage Collection(RFC 2461 5.3) */ + if (ln->ln_expire) + next = nd6_free(rt); + break; + case ND6_LLINFO_DELAY: if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) { /* We need NUD */ ln->ln_asked = 1; ln->ln_state = ND6_LLINFO_PROBE; - ln->ln_expire = time_second + + ln->ln_expire = timenow.tv_sec + ndi->retrans / 1000; nd6_ns_output(ifp, &dst->sin6_addr, &dst->sin6_addr, - ln, 0); - } - else + ln, 0, 0); + } else { ln->ln_state = ND6_LLINFO_STALE; /* XXX */ + ln->ln_expire = timenow.tv_sec + nd6_gctimer; + } break; case ND6_LLINFO_PROBE: if (ln->ln_asked < nd6_umaxtries) { ln->ln_asked++; - ln->ln_expire = time_second + + ln->ln_expire = timenow.tv_sec + nd_ifinfo[ifp->if_index].retrans / 1000; nd6_ns_output(ifp, &dst->sin6_addr, - &dst->sin6_addr, ln, 0); + &dst->sin6_addr, ln, 0, 0); } else { - nd6_free(rt); + next = nd6_free(rt); } break; - case ND6_LLINFO_WAITDELETE: - nd6_free(rt); - break; } ln = next; } - /* expire */ + /* expire default router list */ + lck_mtx_lock(nd6_mutex); dr = TAILQ_FIRST(&nd_defrouter); while (dr) { - if (dr->expire && dr->expire < time_second) { + if (dr->expire && dr->expire < timenow.tv_sec) { struct nd_defrouter *t; t = TAILQ_NEXT(dr, dr_entry); - defrtrlist_del(dr); + defrtrlist_del(dr, 1); dr = t; } else { -#if MIP6 - if (mip6_expired_defrouter_hook) - (*mip6_expired_defrouter_hook)(dr); -#endif /* MIP6 */ dr = TAILQ_NEXT(dr, dr_entry); } } - pr = nd_prefix.lh_first; - while (pr) { - struct in6_ifaddr *ia6; - struct in6_addrlifetime *lt6; - if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) - ia6 = NULL; - else - ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr); - - if (ia6) { - /* check address lifetime */ - lt6 = &ia6->ia6_lifetime; - if (lt6->ia6t_preferred && lt6->ia6t_preferred < time_second) - ia6->ia6_flags |= IN6_IFF_DEPRECATED; - if (lt6->ia6t_expire && lt6->ia6t_expire < time_second) { - if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) - in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr); - /* xxx ND_OPT_PI_FLAG_ONLINK processing */ + /* + * expire interface addresses. + * in the past the loop was inside prefix expiry processing. + * However, from a stricter speci-confrmance standpoint, we should + * rather separate address lifetimes and prefix lifetimes. + */ + addrloop: + for (ia6 = in6_ifaddrs; ia6; ia6 = nia6) { + nia6 = ia6->ia_next; + /* check address lifetime */ + lt6 = &ia6->ia6_lifetime; + if (IFA6_IS_INVALID(ia6)) { + int regen = 0; + + /* + * If the expiring address is temporary, try + * regenerating a new one. This would be useful when + * we suspended a laptop PC, then turned it on after a + * period that could invalidate all temporary + * addresses. Although we may have to restart the + * loop (see below), it must be after purging the + * address. Otherwise, we'd see an infinite loop of + * regeneration. + */ + if (ip6_use_tempaddr && + (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { + if (regen_tmpaddr(ia6) == 0) + regen = 1; + } + + in6_purgeaddr(&ia6->ia_ifa, 1); + + if (regen) + goto addrloop; /* XXX: see below */ + } + if (IFA6_IS_DEPRECATED(ia6)) { + int oldflags = ia6->ia6_flags; + + ia6->ia6_flags |= IN6_IFF_DEPRECATED; + + /* + * If a temporary address has just become deprecated, + * regenerate a new one if possible. + */ + if (ip6_use_tempaddr && + (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && + (oldflags & IN6_IFF_DEPRECATED) == 0) { + + if (regen_tmpaddr(ia6) == 0) { + /* + * A new temporary address is + * generated. + * XXX: this means the address chain + * has changed while we are still in + * the loop. Although the change + * would not cause disaster (because + * it's not a deletion, but an + * addition,) we'd rather restart the + * loop just for safety. Or does this + * significantly reduce performance?? + */ + goto addrloop; + } } + } else { + /* + * A new RA might have made a deprecated address + * preferred. + */ + ia6->ia6_flags &= ~IN6_IFF_DEPRECATED; } + } + /* expire prefix list */ + pr = nd_prefix.lh_first; + while (pr) { /* * check prefix lifetime. * since pltime is just for autoconf, pltime processing for * prefix is not necessary. - * - * we offset expire time by NDPR_KEEP_EXPIRE, so that we - * can use the old prefix information to validate the - * next prefix information to come. See prelist_update() - * for actual validation. */ - if (pr->ndpr_expire - && pr->ndpr_expire + NDPR_KEEP_EXPIRED < time_second) { + if (pr->ndpr_expire && pr->ndpr_expire < timenow.tv_sec) { struct nd_prefix *t; t = pr->ndpr_next; /* * address expiration and prefix expiration are - * separate. NEVER perform in6_ifdel here. + * separate. NEVER perform in6_purgeaddr here. */ - prelist_remove(pr); + prelist_remove(pr, 1); pr = t; } else pr = pr->ndpr_next; } - splx(s); + lck_mtx_unlock(nd6_mutex); + timeout(nd6_timer, (caddr_t)0, nd6_prune * hz); +} + +static int +regen_tmpaddr( + struct in6_ifaddr *ia6) /* deprecated/invalidated temporary address */ +{ + struct ifaddr *ifa; + struct ifnet *ifp; + struct in6_ifaddr *public_ifa6 = NULL; + struct timeval timenow; + + getmicrotime(&timenow); + + ifp = ia6->ia_ifa.ifa_ifp; + ifnet_lock_exclusive(ifp); + for (ifa = ifp->if_addrlist.tqh_first; ifa; + ifa = ifa->ifa_list.tqe_next) + { + struct in6_ifaddr *it6; + + if (ifa->ifa_addr->sa_family != AF_INET6) + continue; + + it6 = (struct in6_ifaddr *)ifa; + + /* ignore no autoconf addresses. */ + if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0) + continue; + + /* ignore autoconf addresses with different prefixes. */ + if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr) + continue; + + /* + * Now we are looking at an autoconf address with the same + * prefix as ours. If the address is temporary and is still + * preferred, do not create another one. It would be rare, but + * could happen, for example, when we resume a laptop PC after + * a long period. + */ + if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && + !IFA6_IS_DEPRECATED(it6)) { + public_ifa6 = NULL; + break; + } + + /* + * This is a public autoconf address that has the same prefix + * as ours. If it is preferred, keep it. We can't break the + * loop here, because there may be a still-preferred temporary + * address with the prefix. + */ + if (!IFA6_IS_DEPRECATED(it6)) + public_ifa6 = it6; + } + ifnet_lock_done(ifp); + + if (public_ifa6 != NULL) { + int e; + + if ((e = in6_tmpifadd(public_ifa6, 0)) != 0) { + log(LOG_NOTICE, "regen_tmpaddr: failed to create a new" + " tmp addr,errno=%d\n", e); + return(-1); + } + return(0); + } + + return(-1); } /* @@ -600,14 +744,15 @@ nd6_timer(ignored_arg) * ifp goes away. */ void -nd6_purge(ifp) - struct ifnet *ifp; +nd6_purge( + struct ifnet *ifp) { struct llinfo_nd6 *ln, *nln; struct nd_defrouter *dr, *ndr, drany; struct nd_prefix *pr, *npr; /* Nuke default router list entries toward ifp */ + lck_mtx_lock(nd6_mutex); if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) { /* * The first entry of the list may be stored in @@ -616,20 +761,26 @@ nd6_purge(ifp) for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = ndr) { ndr = TAILQ_NEXT(dr, dr_entry); if (dr->ifp == ifp) - defrtrlist_del(dr); + defrtrlist_del(dr, 1); } dr = TAILQ_FIRST(&nd_defrouter); if (dr->ifp == ifp) - defrtrlist_del(dr); + defrtrlist_del(dr, 1); } /* Nuke prefix list entries toward ifp */ for (pr = nd_prefix.lh_first; pr; pr = npr) { npr = pr->ndpr_next; if (pr->ndpr_ifp == ifp) { - if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) - in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr); - prelist_remove(pr); + /* + * Previously, pr->ndpr_addr is removed as well, + * but I strongly believe we don't have to do it. + * nd6_purge() is only called from in6_ifdetach(), + * which removes all the associated interface addresses + * by itself. + * (jinmei@kame.net 20010129) + */ + prelist_remove(pr, 1); } } @@ -637,10 +788,13 @@ nd6_purge(ifp) if (nd6_defifindex == ifp->if_index) nd6_setdefaultiface(0); - /* refresh default router list */ - bzero(&drany, sizeof(drany)); - defrouter_delreq(&drany, 0); - defrouter_select(); + if (!ip6_forwarding && (ip6_accept_rtadv || (ifp->if_eflags & IFEF_ACCEPT_RTADVD))) { + /* refresh default router list */ + bzero(&drany, sizeof(drany)); + defrouter_delreq(&drany, 0); + defrouter_select(); + } + lck_mtx_unlock(nd6_mutex); /* * Nuke neighbor cache entries for the ifp. @@ -659,40 +813,18 @@ nd6_purge(ifp) rt->rt_gateway->sa_family == AF_LINK) { sdl = (struct sockaddr_dl *)rt->rt_gateway; if (sdl->sdl_index == ifp->if_index) - nd6_free(rt); - } - ln = nln; - } - - /* - * Neighbor cache entry for interface route will be retained - * with ND6_LLINFO_WAITDELETE state, by nd6_free(). Nuke it. - */ - ln = llinfo_nd6.ln_next; - while (ln && ln != &llinfo_nd6) { - struct rtentry *rt; - struct sockaddr_dl *sdl; - - nln = ln->ln_next; - rt = ln->ln_rt; - if (rt && rt->rt_gateway && - rt->rt_gateway->sa_family == AF_LINK) { - sdl = (struct sockaddr_dl *)rt->rt_gateway; - if (sdl->sdl_index == ifp->if_index) { - rtrequest(RTM_DELETE, rt_key(rt), - (struct sockaddr *)0, rt_mask(rt), 0, - (struct rtentry **)0); - } + nln = nd6_free(rt); } ln = nln; } } struct rtentry * -nd6_lookup(addr6, create, ifp) - struct in6_addr *addr6; - int create; - struct ifnet *ifp; +nd6_lookup( + struct in6_addr *addr6, + int create, + struct ifnet *ifp, + int rt_locked) { struct rtentry *rt; struct sockaddr_in6 sin6; @@ -701,11 +833,12 @@ nd6_lookup(addr6, create, ifp) sin6.sin6_len = sizeof(struct sockaddr_in6); sin6.sin6_family = AF_INET6; sin6.sin6_addr = *addr6; - rt = rtalloc1((struct sockaddr *)&sin6, create -#if __FreeBSD__ || defined (__APPLE__) - , 0UL -#endif /*__FreeBSD__*/ - ); +#if SCOPEDROUTING + sin6.sin6_scope_id = in6_addr2scopeid(ifp, addr6); +#endif + if (!rt_locked) + lck_mtx_lock(rt_mtx); + rt = rtalloc1_locked((struct sockaddr *)&sin6, create, 0UL); if (rt && (rt->rt_flags & RTF_LLINFO) == 0) { /* * This is the case for the default route. @@ -714,7 +847,7 @@ nd6_lookup(addr6, create, ifp) * interface route. */ if (create) { - RTFREE(rt); + rtfree_locked(rt); rt = 0; } } @@ -731,55 +864,76 @@ nd6_lookup(addr6, create, ifp) */ struct ifaddr *ifa = ifaof_ifpforaddr((struct sockaddr *)&sin6, ifp); - if (ifa == NULL) + if (ifa == NULL) { + if (!rt_locked) + lck_mtx_unlock(rt_mtx); return(NULL); + } /* - * Create a new route. RTF_LLINFO is necessary + * Create a new route. RTF_LLINFO is necessary * to create a Neighbor Cache entry for the * destination in nd6_rtrequest which will be - * called in rtequest via ifa->ifa_rtrequest. + * called in rtrequest via ifa->ifa_rtrequest. */ - if ((e = rtrequest(RTM_ADD, (struct sockaddr *)&sin6, + if ((e = rtrequest_locked(RTM_ADD, (struct sockaddr *)&sin6, ifa->ifa_addr, (struct sockaddr *)&all1_sa, (ifa->ifa_flags | RTF_HOST | RTF_LLINFO) & ~RTF_CLONING, - &rt)) != 0) - log(LOG_ERR, - "nd6_lookup: failed to add route for a " - "neighbor(%s), errno=%d\n", - ip6_sprintf(addr6), e); - if (rt == NULL) + &rt)) != 0) { + if (e != EEXIST) + log(LOG_ERR, + "nd6_lookup: failed to add route for a " + "neighbor(%s), errno=%d\n", + ip6_sprintf(addr6), e); + } + ifafree(ifa); + if (rt == NULL) { + if (!rt_locked) + lck_mtx_unlock(rt_mtx); return(NULL); + } if (rt->rt_llinfo) { struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; ln->ln_state = ND6_LLINFO_NOSTATE; } - } - else + } else { + if (!rt_locked) + lck_mtx_unlock(rt_mtx); return(NULL); + } } - rt->rt_refcnt--; + rtunref(rt); /* * Validation for the entry. + * Note that the check for rt_llinfo is necessary because a cloned + * route from a parent route that has the L flag (e.g. the default + * route to a p2p interface) may have the flag, too, while the + * destination is not actually a neighbor. * XXX: we can't use rt->rt_ifp to check for the interface, since * it might be the loopback interface if the entry is for our * own address on a non-loopback interface. Instead, we should - * use rt->rt_ifa->ifa_ifp, which would specify the REAL interface. + * use rt->rt_ifa->ifa_ifp, which would specify the REAL + * interface. */ - if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 || - rt->rt_gateway->sa_family != AF_LINK || - (ifp && rt->rt_ifa->ifa_ifp != ifp)) { + if ((ifp->if_type !=IFT_PPP) && ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 || + rt->rt_gateway->sa_family != AF_LINK || rt->rt_llinfo == NULL || + + (ifp && rt->rt_ifa->ifa_ifp != ifp))) { + if (!rt_locked) + lck_mtx_unlock(rt_mtx); if (create) { log(LOG_DEBUG, "nd6_lookup: failed to lookup %s (if = %s)\n", ip6_sprintf(addr6), ifp ? if_name(ifp) : "unspec"); /* xxx more logs... kazu */ } - return(0); - } + return(NULL); + } + if (!rt_locked) + lck_mtx_unlock(rt_mtx); return(rt); } @@ -788,48 +942,54 @@ nd6_lookup(addr6, create, ifp) * XXX: should take care of the destination of a p2p link? */ int -nd6_is_addr_neighbor(addr, ifp) - struct in6_addr *addr; - struct ifnet *ifp; +nd6_is_addr_neighbor( + struct sockaddr_in6 *addr, + struct ifnet *ifp, + int rt_locked) { - register struct ifaddr *ifa; + struct ifaddr *ifa; int i; #define IFADDR6(a) ((((struct in6_ifaddr *)(a))->ia_addr).sin6_addr) #define IFMASK6(a) ((((struct in6_ifaddr *)(a))->ia_prefixmask).sin6_addr) - /* A link-local address is always a neighbor. */ - if (IN6_IS_ADDR_LINKLOCAL(addr)) + /* + * A link-local address is always a neighbor. + * XXX: we should use the sin6_scope_id field rather than the embedded + * interface index. + */ + if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) && + ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index) return(1); /* * If the address matches one of our addresses, * it should be a neighbor. */ -#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3) - for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) -#else + ifnet_lock_shared(ifp); for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) -#endif { if (ifa->ifa_addr->sa_family != AF_INET6) - next: continue; + continue; for (i = 0; i < 4; i++) { - if ((IFADDR6(ifa).s6_addr32[i] ^ addr->s6_addr32[i]) & - IFMASK6(ifa).s6_addr32[i]) - goto next; + if ((IFADDR6(ifa).s6_addr32[i] ^ + addr->sin6_addr.s6_addr32[i]) & + IFMASK6(ifa).s6_addr32[i]) + continue; } + ifnet_lock_done(ifp); return(1); } + ifnet_lock_done(ifp); /* * Even if the address matches none of our addresses, it might be * in the neighbor cache. */ - if (nd6_lookup(addr, 0, ifp)) + if (nd6_lookup(&addr->sin6_addr, 0, ifp, rt_locked) != NULL) return(1); return(0); @@ -840,31 +1000,25 @@ nd6_is_addr_neighbor(addr, ifp) /* * Free an nd6 llinfo entry. */ -void -nd6_free(rt) - struct rtentry *rt; +struct llinfo_nd6 * +nd6_free( + struct rtentry *rt) { - struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; - struct sockaddr_dl *sdl; + struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo, *next; struct in6_addr in6 = ((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; struct nd_defrouter *dr; /* - * Clear all destination cache entries for the neighbor. - * XXX: is it better to restrict this to hosts? + * we used to have pfctlinput(PRC_HOSTDEAD) here. + * even though it is not harmful, it was not really necessary. */ - pfctlinput(PRC_HOSTDEAD, rt_key(rt)); - if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */ - int s; -#ifdef __NetBSD__ - s = splsoftnet(); -#else - s = splnet(); -#endif + if (!ip6_forwarding && (ip6_accept_rtadv || (rt->rt_ifp->if_eflags & IFEF_ACCEPT_RTADVD))) { + lck_mtx_lock(nd6_mutex); dr = defrouter_lookup(&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, rt->rt_ifp); - if (ln->ln_router || dr) { + + if ((ln && ln->ln_router) || dr) { /* * rt6_flush must be called whether or not the neighbor * is in the Default Router List. @@ -883,12 +1037,20 @@ nd6_free(rt) /* * Temporarily fake the state to choose a new default * router and to perform on-link determination of - * prefixes coreectly. + * prefixes correctly. * Below the state will be set correctly, * or the entry itself will be deleted. */ ln->ln_state = ND6_LLINFO_INCOMPLETE; + /* + * Since defrouter_select() does not affect the + * on-link determination and MIP6 needs the check + * before the default router selection, we perform + * the check now. + */ + pfxlist_onlink_check(1); + if (dr == TAILQ_FIRST(&nd_defrouter)) { /* * It is used as the current default router, @@ -902,22 +1064,30 @@ nd6_free(rt) defrouter_select(); } - pfxlist_onlink_check(); } - splx(s); + lck_mtx_unlock(nd6_mutex); } - if (rt->rt_refcnt > 0 && (sdl = SDL(rt->rt_gateway)) && - sdl->sdl_family == AF_LINK) { - sdl->sdl_alen = 0; - ln->ln_state = ND6_LLINFO_WAITDELETE; - ln->ln_asked = 0; - rt->rt_flags &= ~RTF_REJECT; - return; - } + /* + * Before deleting the entry, remember the next entry as the + * return value. We need this because pfxlist_onlink_check() above + * might have freed other entries (particularly the old next entry) as + * a side effect (XXX). + */ + if (ln) + next = ln->ln_next; + else + next = 0; + /* + * Detach the route from the routing tree and the list of neighbor + * caches, and disable the route entry not to be used in already + * cached routes. + */ rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0, rt_mask(rt), 0, (struct rtentry **)0); + + return(next); } /* @@ -926,14 +1096,15 @@ nd6_free(rt) * XXX cost-effective metods? */ void -nd6_nud_hint(rt, dst6) - struct rtentry *rt; - struct in6_addr *dst6; +nd6_nud_hint( + struct rtentry *rt, + struct in6_addr *dst6, + int force) { struct llinfo_nd6 *ln; -#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined (__APPLE__) - long time_second = time.tv_sec; -#endif + struct timeval timenow; + + getmicrotime(&timenow); /* * If the caller specified "rt", use that. Otherwise, resolve the @@ -942,15 +1113,14 @@ nd6_nud_hint(rt, dst6) if (!rt) { if (!dst6) return; - if (!(rt = nd6_lookup(dst6, 0, NULL))) + if (!(rt = nd6_lookup(dst6, 0, NULL, 0))) return; } - if ((rt->rt_flags & RTF_GATEWAY) - || (rt->rt_flags & RTF_LLINFO) == 0 - || !rt->rt_llinfo - || !rt->rt_gateway - || rt->rt_gateway->sa_family != AF_LINK) { + if ((rt->rt_flags & RTF_GATEWAY) != 0 || + (rt->rt_flags & RTF_LLINFO) == 0 || + !rt->rt_llinfo || !rt->rt_gateway || + rt->rt_gateway->sa_family != AF_LINK) { /* This is not a host route. */ return; } @@ -959,135 +1129,72 @@ nd6_nud_hint(rt, dst6) if (ln->ln_state < ND6_LLINFO_REACHABLE) return; + /* + * if we get upper-layer reachability confirmation many times, + * it is possible we have false information. + */ + if (!force) { + ln->ln_byhint++; + if (ln->ln_byhint > nd6_maxnudhint) + return; + } + ln->ln_state = ND6_LLINFO_REACHABLE; - if (ln->ln_expire && nd_ifinfo) - ln->ln_expire = time_second + - (rt->rt_ifp ? nd_ifinfo[rt->rt_ifp->if_index].reachable : 0) ; + if (ln->ln_expire) + ln->ln_expire = timenow.tv_sec + + nd_ifinfo[rt->rt_ifp->if_index].reachable; } -#if OLDIP6OUTPUT -/* - * Resolve an IP6 address into an ethernet address. If success, - * desten is filled in. If there is no entry in ndptab, - * set one up and multicast a solicitation for the IP6 address. - * Hold onto this mbuf and resend it once the address - * is finally resolved. A return value of 1 indicates - * that desten has been filled in and the packet should be sent - * normally; a 0 return indicates that the packet has been - * taken over here, either now or for later transmission. - */ -int -nd6_resolve(ifp, rt, m, dst, desten) - struct ifnet *ifp; - struct rtentry *rt; - struct mbuf *m; - struct sockaddr *dst; - u_char *desten; +void +nd6_rtrequest( + int req, + struct rtentry *rt, + struct sockaddr *sa) /* xxx unused */ { - struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL; - struct sockaddr_dl *sdl; -#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined (__APPLE__) - long time_second = time.tv_sec; -#endif + struct sockaddr *gate = rt->rt_gateway; + struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; + static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; + struct ifnet *ifp = rt->rt_ifp; + struct ifaddr *ifa; + struct timeval timenow; - if (m->m_flags & M_MCAST) { - switch (ifp->if_type) { - case IFT_ETHER: - case IFT_FDDI: - ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr, - desten); - return(1); - break; - case IFT_ARCNET: - *desten = 0; - return(1); - break; - default: - return(0); - } - } - if (rt && (rt->rt_flags & RTF_LLINFO) != 0) - ln = (struct llinfo_nd6 *)rt->rt_llinfo; - else { - if ((rt = nd6_lookup(&(SIN6(dst)->sin6_addr), 1, ifp)) != NULL) - ln = (struct llinfo_nd6 *)rt->rt_llinfo; + + if ((rt->rt_flags & RTF_GATEWAY)) + return; + + if (nd6_need_cache(ifp) == 0 && (rt->rt_flags & RTF_HOST) == 0) { + /* + * This is probably an interface direct route for a link + * which does not need neighbor caches (e.g. fe80::%lo0/64). + * We do not need special treatment below for such a route. + * Moreover, the RTF_LLINFO flag which would be set below + * would annoy the ndp(8) command. + */ + return; } - if (!ln || !rt) { - log(LOG_DEBUG, "nd6_resolve: can't allocate llinfo for %s\n", - ip6_sprintf(&(SIN6(dst)->sin6_addr))); - m_freem(m); - return(0); + + if (req == RTM_RESOLVE && + (nd6_need_cache(ifp) == 0 || /* stf case */ + !nd6_is_addr_neighbor((struct sockaddr_in6 *)rt_key(rt), ifp, 1))) { + /* + * FreeBSD and BSD/OS often make a cloned host route based + * on a less-specific route (e.g. the default route). + * If the less specific route does not have a "gateway" + * (this is the case when the route just goes to a p2p or an + * stf interface), we'll mistakenly make a neighbor cache for + * the host route, and will see strange neighbor solicitation + * for the corresponding destination. In order to avoid the + * confusion, we check if the destination of the route is + * a neighbor in terms of neighbor discovery, and stop the + * process if not. Additionally, we remove the LLINFO flag + * so that ndp(8) will not try to get the neighbor information + * of the destination. + */ + rt->rt_flags &= ~RTF_LLINFO; + return; } - sdl = SDL(rt->rt_gateway); - /* - * Ckeck the address family and length is valid, the address - * is resolved; otherwise, try to resolve. - */ - if (ln->ln_state >= ND6_LLINFO_REACHABLE - && sdl->sdl_family == AF_LINK - && sdl->sdl_alen != 0) { - bcopy(LLADDR(sdl), desten, sdl->sdl_alen); - if (ln->ln_state == ND6_LLINFO_STALE) { - ln->ln_asked = 0; - ln->ln_state = ND6_LLINFO_DELAY; - ln->ln_expire = time_second + nd6_delay; - } - return(1); - } - /* - * There is an ndp entry, but no ethernet address - * response yet. Replace the held mbuf with this - * latest one. - * - * XXX Does the code conform to rate-limiting rule? - * (RFC 2461 7.2.2) - */ - if (ln->ln_state == ND6_LLINFO_WAITDELETE || - ln->ln_state == ND6_LLINFO_NOSTATE) - ln->ln_state = ND6_LLINFO_INCOMPLETE; - if (ln->ln_hold) - m_freem(ln->ln_hold); - ln->ln_hold = m; - if (ln->ln_expire) { - rt->rt_flags &= ~RTF_REJECT; - if (ln->ln_asked < nd6_mmaxtries && - ln->ln_expire < time_second) { - ln->ln_asked++; - ln->ln_expire = time_second + - nd_ifinfo[ifp->if_index].retrans / 1000; - nd6_ns_output(ifp, NULL, &(SIN6(dst)->sin6_addr), - ln, 0); - } - } - return(0); -} -#endif /* OLDIP6OUTPUT */ - -void -#if defined(__bsdi__) && _BSDI_VERSION >= 199802 -nd6_rtrequest(req, rt, info) - int req; - struct rtentry *rt; - struct rt_addrinfo *info; /* xxx unused */ -#else -nd6_rtrequest(req, rt, sa) - int req; - struct rtentry *rt; - struct sockaddr *sa; /* xxx unused */ -#endif -{ - struct sockaddr *gate = rt->rt_gateway; - struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; - static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; - struct ifnet *ifp = rt->rt_ifp; - struct ifaddr *ifa; -#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined (__APPLE__) - long time_second = time.tv_sec; -#endif - - if (rt->rt_flags & RTF_GATEWAY) - return; + getmicrotime(&timenow); switch (req) { case RTM_ADD: /* @@ -1100,7 +1207,7 @@ nd6_rtrequest(req, rt, sa) if (rt->rt_flags & (RTF_CLONING | RTF_LLINFO)) { /* * Case 1: This route should come from - * a route to interface. RTF_LLINFO flag is set + * a route to interface. RTF_LLINFO flag is set * for a host route whose destination should be * treated as on-link. */ @@ -1110,18 +1217,18 @@ nd6_rtrequest(req, rt, sa) SDL(gate)->sdl_type = ifp->if_type; SDL(gate)->sdl_index = ifp->if_index; if (ln) - ln->ln_expire = time_second; + ln->ln_expire = timenow.tv_sec; #if 1 if (ln && ln->ln_expire == 0) { - /* cludge for desktops */ + /* kludge for desktops */ #if 0 - printf("nd6_request: time.tv_sec is zero; " + printf("nd6_rtequest: time.tv_sec is zero; " "treat it as 1\n"); #endif ln->ln_expire = 1; } #endif - if (rt->rt_flags & RTF_CLONING) + if ((rt->rt_flags & RTF_CLONING)) break; } /* @@ -1134,10 +1241,10 @@ nd6_rtrequest(req, rt, sa) * (7.2.6 paragraph 4), however, it also says that we * SHOULD provide a mechanism to prevent multicast NA storm. * we don't have anything like it right now. - * note that the mechanism need a mutual agreement + * note that the mechanism needs a mutual agreement * between proxies, which means that we need to implement - * a new protocol, or new kludge. - * - from RFC2461 6.2.4, host MUST NOT send unsolicited NA. + * a new protocol, or a new kludge. + * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA. * we need to check ip6forwarding before sending it. * (or should we allow proxy ND configuration only for * routers? there's no mention about proxy ND from hosts) @@ -1153,7 +1260,7 @@ nd6_rtrequest(req, rt, sa) #endif /* FALLTHROUGH */ case RTM_RESOLVE: - if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { + if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) { /* * Address resolution isn't necessary for a point to * point link, so we can skip this test for a p2p link. @@ -1161,7 +1268,8 @@ nd6_rtrequest(req, rt, sa) if (gate->sa_family != AF_LINK || gate->sa_len < sizeof(null_sdl)) { log(LOG_DEBUG, - "nd6_rtrequest: bad gateway value\n"); + "nd6_rtrequest: bad gateway value: %s\n", + if_name(ifp)); break; } SDL(gate)->sdl_type = ifp->if_type; @@ -1191,13 +1299,14 @@ nd6_rtrequest(req, rt, sa) * which is specified by ndp command. */ ln->ln_state = ND6_LLINFO_REACHABLE; + ln->ln_byhint = 0; } else { /* * When req == RTM_RESOLVE, rt is created and * initialized in rtrequest(), so rt_expire is 0. */ ln->ln_state = ND6_LLINFO_NOSTATE; - ln->ln_expire = time_second; + ln->ln_expire = timenow.tv_sec; } rt->rt_flags |= RTF_LLINFO; ln->ln_next = llinfo_nd6.ln_next; @@ -1215,22 +1324,13 @@ nd6_rtrequest(req, rt, sa) caddr_t macp = nd6_ifptomac(ifp); ln->ln_expire = 0; ln->ln_state = ND6_LLINFO_REACHABLE; + ln->ln_byhint = 0; if (macp) { Bcopy(macp, LLADDR(SDL(gate)), ifp->if_addrlen); SDL(gate)->sdl_alen = ifp->if_addrlen; } if (nd6_useloopback) { -#ifdef __bsdi__ -#if _BSDI_VERSION >= 199802 - extern struct ifnet *loifp; - rt->rt_ifp = loifp; /*XXX*/ -#else - extern struct ifnet loif; - rt->rt_ifp = &loif; /*XXX*/ -#endif -#else /* non-bsdi */ - rt->rt_ifp = &loif[0]; /*XXX*/ -#endif + rt->rt_ifp = &loif[0]; /* XXX */ /* * Make sure rt_ifa be equal to the ifaddr * corresponding to the address. @@ -1240,14 +1340,13 @@ nd6_rtrequest(req, rt, sa) * of the loopback address. */ if (ifa != rt->rt_ifa) { - rt->rt_ifa->ifa_refcnt--; - ifa->ifa_refcnt++; - rt->rt_ifa = ifa; + rtsetifa(rt, ifa); } } } else if (rt->rt_flags & RTF_ANNOUNCE) { ln->ln_expire = 0; ln->ln_state = ND6_LLINFO_REACHABLE; + ln->ln_byhint = 0; /* join solicited node multicast for proxy ND */ if (ifp->if_flags & IFF_MULTICAST) { @@ -1261,10 +1360,11 @@ nd6_rtrequest(req, rt, sa) llsol.s6_addr32[2] = htonl(1); llsol.s6_addr8[12] = 0xff; - (void)in6_addmulti(&llsol, ifp, &error); - if (error) - printf( -"nd6_rtrequest: could not join solicited node multicast (errno=%d)\n", error); + if (!in6_addmulti(&llsol, ifp, &error, 0)) { + nd6log((LOG_ERR, "%s: failed to join " + "%s (errno=%d)\n", if_name(ifp), + ip6_sprintf(&llsol), error)); + } } } break; @@ -1285,9 +1385,11 @@ nd6_rtrequest(req, rt, sa) llsol.s6_addr32[2] = htonl(1); llsol.s6_addr8[12] = 0xff; + ifnet_lock_shared(ifp); IN6_LOOKUP_MULTI(llsol, ifp, in6m); + ifnet_lock_done(ifp); if (in6m) - in6_delmulti(in6m); + in6_delmulti(in6m, 0); } nd6_inuse--; ln->ln_next->ln_prev = ln->ln_prev; @@ -1297,91 +1399,16 @@ nd6_rtrequest(req, rt, sa) rt->rt_flags &= ~RTF_LLINFO; if (ln->ln_hold) m_freem(ln->ln_hold); - Free((caddr_t)ln); - } -} - -void -#if defined(__bsdi__) && _BSDI_VERSION >= 199802 -nd6_p2p_rtrequest(req, rt, info) - int req; - struct rtentry *rt; - struct rt_addrinfo *info; /* xxx unused */ -#else -nd6_p2p_rtrequest(req, rt, sa) - int req; - struct rtentry *rt; - struct sockaddr *sa; /* xxx unused */ -#endif -{ - struct sockaddr *gate = rt->rt_gateway; - static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; - struct ifnet *ifp = rt->rt_ifp; - struct ifaddr *ifa; - - if (rt->rt_flags & RTF_GATEWAY) - return; - - switch (req) { - case RTM_ADD: - /* - * There is no backward compatibility :) - * - * if ((rt->rt_flags & RTF_HOST) == 0 && - * SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) - * rt->rt_flags |= RTF_CLONING; - */ - if (rt->rt_flags & RTF_CLONING) { - /* - * Case 1: This route should come from - * a route to interface. - */ - rt_setgate(rt, rt_key(rt), - (struct sockaddr *)&null_sdl); - gate = rt->rt_gateway; - SDL(gate)->sdl_type = ifp->if_type; - SDL(gate)->sdl_index = ifp->if_index; - break; - } - /* Announce a new entry if requested. */ - if (rt->rt_flags & RTF_ANNOUNCE) - nd6_na_output(ifp, - &SIN6(rt_key(rt))->sin6_addr, - &SIN6(rt_key(rt))->sin6_addr, - ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, - 1, NULL); - /* FALLTHROUGH */ - case RTM_RESOLVE: - /* - * check if rt_key(rt) is one of my address assigned - * to the interface. - */ - ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp, - &SIN6(rt_key(rt))->sin6_addr); - if (ifa) { - if (nd6_useloopback) { -#ifdef __bsdi__ -#if _BSDI_VERSION >= 199802 - extern struct ifnet *loifp; - rt->rt_ifp = loifp; /*XXX*/ -#else - extern struct ifnet loif; - rt->rt_ifp = &loif; /*XXX*/ -#endif -#else - rt->rt_ifp = &loif[0]; /*XXX*/ -#endif /*__bsdi__*/ - } - } - break; + ln->ln_hold = NULL; + R_Free((caddr_t)ln); } } int -nd6_ioctl(cmd, data, ifp) - u_long cmd; - caddr_t data; - struct ifnet *ifp; +nd6_ioctl( + u_long cmd, + caddr_t data, + struct ifnet *ifp) { struct in6_drlist *drl = (struct in6_drlist *)data; struct in6_prlist *prl = (struct in6_prlist *)data; @@ -1392,24 +1419,21 @@ nd6_ioctl(cmd, data, ifp) struct nd_prefix *pr; struct rtentry *rt; int i = 0, error = 0; - int s; switch (cmd) { case SIOCGDRLST_IN6: + /* + * obsolete API, use sysctl under net.inet6.icmp6 + */ + lck_mtx_lock(nd6_mutex); bzero(drl, sizeof(*drl)); -#ifdef __NetBSD__ - s = splsoftnet(); -#else - s = splnet(); -#endif dr = TAILQ_FIRST(&nd_defrouter); while (dr && i < DRLSTSIZ) { drl->defrouter[i].rtaddr = dr->rtaddr; if (IN6_IS_ADDR_LINKLOCAL(&drl->defrouter[i].rtaddr)) { /* XXX: need to this hack for KAME stack */ drl->defrouter[i].rtaddr.s6_addr16[1] = 0; - } - else + } else log(LOG_ERR, "default router list contains a " "non-linklocal address(%s)\n", @@ -1422,26 +1446,26 @@ nd6_ioctl(cmd, data, ifp) i++; dr = TAILQ_NEXT(dr, dr_entry); } - splx(s); + lck_mtx_unlock(nd6_mutex); break; case SIOCGPRLST_IN6: + /* + * obsolete API, use sysctl under net.inet6.icmp6 + */ /* * XXX meaning of fields, especialy "raflags", is very * differnet between RA prefix list and RR/static prefix list. * how about separating ioctls into two? */ bzero(prl, sizeof(*prl)); -#ifdef __NetBSD__ - s = splsoftnet(); -#else - s = splnet(); -#endif + lck_mtx_lock(nd6_mutex); pr = nd_prefix.lh_first; while (pr && i < PRLSTSIZ) { struct nd_pfxrouter *pfr; int j; - prl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr; + (void)in6_embedscope(&prl->prefix[i].prefix, + &pr->ndpr_prefix, NULL, NULL); prl->prefix[i].raflags = pr->ndpr_raf; prl->prefix[i].prefixlen = pr->ndpr_plen; prl->prefix[i].vltime = pr->ndpr_vltime; @@ -1451,15 +1475,14 @@ nd6_ioctl(cmd, data, ifp) pfr = pr->ndpr_advrtrs.lh_first; j = 0; - while(pfr) { + while (pfr) { if (j < DRLSTSIZ) { #define RTRADDR prl->prefix[i].advrtr[j] RTRADDR = pfr->router->rtaddr; if (IN6_IS_ADDR_LINKLOCAL(&RTRADDR)) { /* XXX: hack for KAME */ RTRADDR.s6_addr16[1] = 0; - } - else + } else log(LOG_ERR, "a router(%s) advertises " "a prefix with " @@ -1483,7 +1506,8 @@ nd6_ioctl(cmd, data, ifp) rpp = LIST_NEXT(rpp, rp_entry)) { if (i >= PRLSTSIZ) break; - prl->prefix[i].prefix = rpp->rp_prefix.sin6_addr; + (void)in6_embedscope(&prl->prefix[i].prefix, + &pr->ndpr_prefix, NULL, NULL); prl->prefix[i].raflags = rpp->rp_raf; prl->prefix[i].prefixlen = rpp->rp_plen; prl->prefix[i].vltime = rpp->rp_vltime; @@ -1495,14 +1519,37 @@ nd6_ioctl(cmd, data, ifp) i++; } } - splx(s); - + lck_mtx_unlock(nd6_mutex); + break; + case OSIOCGIFINFO_IN6: + if (!nd_ifinfo || i >= nd_ifinfo_indexlim) { + error = EINVAL; + break; + } + ndi->ndi.linkmtu = nd_ifinfo[ifp->if_index].linkmtu; + ndi->ndi.maxmtu = nd_ifinfo[ifp->if_index].maxmtu; + ndi->ndi.basereachable = + nd_ifinfo[ifp->if_index].basereachable; + ndi->ndi.reachable = nd_ifinfo[ifp->if_index].reachable; + ndi->ndi.retrans = nd_ifinfo[ifp->if_index].retrans; + ndi->ndi.flags = nd_ifinfo[ifp->if_index].flags; + ndi->ndi.recalctm = nd_ifinfo[ifp->if_index].recalctm; + ndi->ndi.chlim = nd_ifinfo[ifp->if_index].chlim; + ndi->ndi.receivedra = nd_ifinfo[ifp->if_index].receivedra; break; case SIOCGIFINFO_IN6: + if (!nd_ifinfo || i >= nd_ifinfo_indexlim) { + error = EINVAL; + break; + } ndi->ndi = nd_ifinfo[ifp->if_index]; break; case SIOCSIFINFO_FLAGS: /* XXX: almost all other fields of ndi->ndi is unused */ + if (!nd_ifinfo || i >= nd_ifinfo_indexlim) { + error = EINVAL; + break; + } nd_ifinfo[ifp->if_index].flags = ndi->ndi.flags; break; case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */ @@ -1512,27 +1559,40 @@ nd6_ioctl(cmd, data, ifp) * route equals to the top of default router list */ bzero(&any, sizeof(any)); - defrouter_delreq(&any, 0); + lck_mtx_lock(nd6_mutex); + defrouter_delreq(&any, 1); defrouter_select(); + lck_mtx_unlock(nd6_mutex); /* xxx sumikawa: flush prefix list */ break; case SIOCSPFXFLUSH_IN6: { /* flush all the prefix advertised by routers */ struct nd_prefix *pr, *next; + lck_mtx_lock(nd6_mutex); -#ifdef __NetBSD__ - s = splsoftnet(); -#else - s = splnet(); -#endif for (pr = nd_prefix.lh_first; pr; pr = next) { + struct in6_ifaddr *ia, *ia_next; + next = pr->ndpr_next; - if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) - in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr); - prelist_remove(pr); + + if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) + continue; /* XXX */ + + /* do we really have to remove addresses as well? */ + for (ia = in6_ifaddrs; ia; ia = ia_next) { + /* ia might be removed. keep the next ptr. */ + ia_next = ia->ia_next; + + if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0) + continue; + + if (ia->ia6_ndpr == pr) + in6_purgeaddr(&ia->ia_ifa, 1); + } + prelist_remove(pr, 1); } - splx(s); + lck_mtx_unlock(nd6_mutex); break; } case SIOCSRTRFLUSH_IN6: @@ -1540,11 +1600,7 @@ nd6_ioctl(cmd, data, ifp) /* flush all the default routers */ struct nd_defrouter *dr, *next; -#ifdef __NetBSD__ - s = splsoftnet(); -#else - s = splnet(); -#endif + lck_mtx_lock(nd6_mutex); if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) { /* * The first entry of the list may be stored in @@ -1552,11 +1608,11 @@ nd6_ioctl(cmd, data, ifp) */ for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = next) { next = TAILQ_NEXT(dr, dr_entry); - defrtrlist_del(dr); + defrtrlist_del(dr, 1); } - defrtrlist_del(TAILQ_FIRST(&nd_defrouter)); + defrtrlist_del(TAILQ_FIRST(&nd_defrouter), 1); } - splx(s); + lck_mtx_unlock(nd6_mutex); break; } case SIOCGNBRINFO_IN6: @@ -1576,14 +1632,8 @@ nd6_ioctl(cmd, data, ifp) *idp = htons(ifp->if_index); } -#ifdef __NetBSD__ - s = splsoftnet(); -#else - s = splnet(); -#endif - if ((rt = nd6_lookup(&nb_addr, 0, ifp)) == NULL) { + if ((rt = nd6_lookup(&nb_addr, 0, ifp, 0)) == NULL) { error = EINVAL; - splx(s); break; } ln = (struct llinfo_nd6 *)rt->rt_llinfo; @@ -1591,7 +1641,6 @@ nd6_ioctl(cmd, data, ifp) nbi->asked = ln->ln_asked; nbi->isrouter = ln->ln_router; nbi->expire = ln->ln_expire; - splx(s); break; } @@ -1610,13 +1659,13 @@ nd6_ioctl(cmd, data, ifp) * on reception of inbound ND6 packets. (RS/RA/NS/redirect) */ struct rtentry * -nd6_cache_lladdr(ifp, from, lladdr, lladdrlen, type, code) - struct ifnet *ifp; - struct in6_addr *from; - char *lladdr; - int lladdrlen; - int type; /* ICMP6 type */ - int code; /* type dependent information */ +nd6_cache_lladdr( + struct ifnet *ifp, + struct in6_addr *from, + char *lladdr, + int lladdrlen, + int type, /* ICMP6 type */ + int code) /* type dependent information */ { struct rtentry *rt = NULL; struct llinfo_nd6 *ln = NULL; @@ -1626,9 +1675,7 @@ nd6_cache_lladdr(ifp, from, lladdr, lladdrlen, type, code) int olladdr; int llchange; int newstate = 0; -#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined (__APPLE__) - long time_second = time.tv_sec; -#endif + struct timeval timenow; if (!ifp) panic("ifp == NULL in nd6_cache_lladdr"); @@ -1648,8 +1695,10 @@ nd6_cache_lladdr(ifp, from, lladdr, lladdrlen, type, code) * Spec says nothing in sections for RA, RS and NA. There's small * description on it in NS section (RFC 2461 7.2.3). */ + getmicrotime(&timenow); - rt = nd6_lookup(from, 0, ifp); + lck_mtx_lock(rt_mtx); + rt = nd6_lookup(from, 0, ifp, 1); if (!rt) { #if 0 /* nothing must be done if there's no lladdr */ @@ -1657,16 +1706,24 @@ nd6_cache_lladdr(ifp, from, lladdr, lladdrlen, type, code) return NULL; #endif - rt = nd6_lookup(from, 1, ifp); + rt = nd6_lookup(from, 1, ifp, 1); is_newentry = 1; - } else + } else { + /* do nothing if static ndp is set */ + if (rt->rt_flags & RTF_STATIC) { + lck_mtx_unlock(rt_mtx); + return NULL; + } is_newentry = 0; + } + + lck_mtx_unlock(rt_mtx); - if (!rt) + if (!rt) return NULL; if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) { fail: - nd6_free(rt); + (void)nd6_free(rt); return NULL; } ln = (struct llinfo_nd6 *)rt->rt_llinfo; @@ -1698,7 +1755,7 @@ fail: * 1 -- y -- (7) * STALE */ - if (lladdr) { /*(3-5) and (7)*/ + if (lladdr) { /* (3-5) and (7) */ /* * Record source link-layer address * XXX is it dependent to ifp->if_type? @@ -1708,17 +1765,17 @@ fail: } if (!is_newentry) { - if ((!olladdr && lladdr) /*(3)*/ - || (olladdr && lladdr && llchange)) { /*(5)*/ + if ((!olladdr && lladdr) /* (3) */ + || (olladdr && lladdr && llchange)) { /* (5) */ do_update = 1; newstate = ND6_LLINFO_STALE; - } else /*(1-2,4)*/ + } else /* (1-2,4) */ do_update = 0; } else { do_update = 1; - if (!lladdr) /*(6)*/ + if (!lladdr) /* (6) */ newstate = ND6_LLINFO_NOSTATE; - else /*(7)*/ + else /* (7) */ newstate = ND6_LLINFO_STALE; } @@ -1729,21 +1786,27 @@ fail: ln->ln_state = newstate; if (ln->ln_state == ND6_LLINFO_STALE) { - rt->rt_flags &= ~RTF_REJECT; + /* + * XXX: since nd6_output() below will cause + * state tansition to DELAY and reset the timer, + * we must set the timer now, although it is actually + * meaningless. + */ + ln->ln_expire = timenow.tv_sec + nd6_gctimer; + if (ln->ln_hold) { -#if OLDIP6OUTPUT - (*ifp->if_output)(ifp, ln->ln_hold, - rt_key(rt), rt); -#else - nd6_output(ifp, ln->ln_hold, + /* + * we assume ifp is not a p2p here, so just + * set the 2nd argument as the 1st one. + */ + nd6_output(ifp, ifp, ln->ln_hold, (struct sockaddr_in6 *)rt_key(rt), - rt); -#endif - ln->ln_hold = 0; + rt, 0); + ln->ln_hold = NULL; } } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { /* probe right away */ - ln->ln_expire = time_second; + ln->ln_expire = timenow.tv_sec; } } @@ -1781,7 +1844,7 @@ fail: /* * New entry must have is_router flag cleared. */ - if (is_newentry) /*(6-7)*/ + if (is_newentry) /* (6-7) */ ln->ln_router = 0; break; case ND_REDIRECT: @@ -1789,11 +1852,10 @@ fail: * If the icmp is a redirect to a better router, always set the * is_router flag. Otherwise, if the entry is newly created, * clear the flag. [RFC 2461, sec 8.3] - * */ if (code == ND_REDIRECT_ROUTER) ln->ln_router = 1; - else if (is_newentry) /*(6-7)*/ + else if (is_newentry) /* (6-7) */ ln->ln_router = 0; break; case ND_ROUTER_SOLICIT: @@ -1806,46 +1868,48 @@ fail: /* * Mark an entry with lladdr as a router. */ - if ((!is_newentry && (olladdr || lladdr)) /*(2-5)*/ - || (is_newentry && lladdr)) { /*(7)*/ + if ((!is_newentry && (olladdr || lladdr)) /* (2-5) */ + || (is_newentry && lladdr)) { /* (7) */ ln->ln_router = 1; } break; } - return rt; -} + /* + * When the link-layer address of a router changes, select the + * best router again. In particular, when the neighbor entry is newly + * created, it might affect the selection policy. + * Question: can we restrict the first condition to the "is_newentry" + * case? + * XXX: when we hear an RA from a new router with the link-layer + * address option, defrouter_select() is called twice, since + * defrtrlist_update called the function as well. However, I believe + * we can compromise the overhead, since it only happens the first + * time. + * XXX: although defrouter_select() should not have a bad effect + * for those are not autoconfigured hosts, we explicitly avoid such + * cases for safety. + */ + if (do_update && ln->ln_router && !ip6_forwarding && (ip6_accept_rtadv || (ifp->if_eflags & IFEF_ACCEPT_RTADVD))) { + lck_mtx_lock(nd6_mutex); + defrouter_select(); + lck_mtx_unlock(nd6_mutex); + } -static void -nd6_slowtimo_funneled(ignored_arg) - void *ignored_arg; -{ -#ifdef __APPLE__ - boolean_t funnel_state; - funnel_state = thread_funnel_set(network_flock, TRUE); -#endif - nd6_slowtimo(ignored_arg); -#ifdef __APPLE__ - (void) thread_funnel_set(network_flock, FALSE); -#endif + return rt; } static void -nd6_slowtimo(ignored_arg) - void *ignored_arg; +nd6_slowtimo( + void *ignored_arg) { - int s; - register int i; - register struct nd_ifinfo *nd6if; - -#ifdef __NetBSD__ - s = splsoftnet(); -#else - s = splnet(); -#endif + int i; + struct nd_ifinfo *nd6if; - timeout(nd6_slowtimo_funneled, (caddr_t)0, ND6_SLOWTIMER_INTERVAL * hz); + lck_mtx_lock(nd6_mutex); for (i = 1; i < if_index + 1; i++) { + if (!nd_ifinfo || i >= nd_ifinfo_indexlim) + continue; nd6if = &nd_ifinfo[i]; if (nd6if->basereachable && /* already initialized */ (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) { @@ -1859,94 +1923,92 @@ nd6_slowtimo(ignored_arg) nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable); } } - splx(s); - + lck_mtx_unlock(nd6_mutex); + timeout(nd6_slowtimo, (caddr_t)0, ND6_SLOWTIMER_INTERVAL * hz); } + #define senderr(e) { error = (e); goto bad;} int -nd6_output(ifp, m0, dst, rt0) - register struct ifnet *ifp; - struct mbuf *m0; - struct sockaddr_in6 *dst; - struct rtentry *rt0; +nd6_output( + struct ifnet *ifp, + struct ifnet *origifp, + struct mbuf *m0, + struct sockaddr_in6 *dst, + struct rtentry *rt0, + int locked) { - register struct mbuf *m = m0; - register struct rtentry *rt = rt0; + struct mbuf *m = m0; + struct rtentry *rt = rt0; + struct sockaddr_in6 *gw6 = NULL; struct llinfo_nd6 *ln = NULL; int error = 0; -#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined (__APPLE__) - long time_second = time.tv_sec; -#endif + struct timeval timenow; if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr)) goto sendpkt; - /* - * XXX: we currently do not make neighbor cache on any interface - * other than ARCnet, Ethernet, FDDI and GIF. - * - * draft-ietf-ngtrans-mech-04.txt says: - * - unidirectional tunnels needs no ND - */ - switch (ifp->if_type) { - case IFT_ARCNET: - case IFT_ETHER: - case IFT_FDDI: - case IFT_GIF: /* XXX need more cases? */ - break; - default: - goto sendpkt; - } - - if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && - (nd_ifinfo[ifp->if_index].flags & ND6_IFF_PERFORMNUD) == 0) + if (nd6_need_cache(ifp) == 0) goto sendpkt; /* - * next hop determination. This routine is derived from ether_outpout. + * next hop determination. This routine is derived from ether_outpout. */ + lck_mtx_lock(rt_mtx); if (rt) { if ((rt->rt_flags & RTF_UP) == 0) { -#if __FreeBSD__ || defined (__APPLE__) - if ((rt0 = rt = rtalloc1((struct sockaddr *)dst, 1, 0UL)) != + if ((rt0 = rt = rtalloc1_locked((struct sockaddr *)dst, 1, 0UL)) != NULL) -#else - if ((rt0 = rt = rtalloc1((struct sockaddr *)dst, 1)) != - NULL) -#endif { - rt->rt_refcnt--; - if (rt->rt_ifp != ifp) - return nd6_output(ifp, m0, dst, rt); /* XXX: loop care? */ - } else + rtunref(rt); + if (rt->rt_ifp != ifp) { + /* XXX: loop care? */ + lck_mtx_unlock(rt_mtx); + return nd6_output(ifp, origifp, m0, + dst, rt, locked); + } + } else { + lck_mtx_unlock(rt_mtx); senderr(EHOSTUNREACH); + } } + if (rt->rt_flags & RTF_GATEWAY) { + gw6 = (struct sockaddr_in6 *)rt->rt_gateway; + + /* + * We skip link-layer address resolution and NUD + * if the gateway is not a neighbor from ND point + * of view, regardless of the value of nd_ifinfo.flags. + * The second condition is a bit tricky; we skip + * if the gateway is our own address, which is + * sometimes used to install a route to a p2p link. + */ + if (!nd6_is_addr_neighbor(gw6, ifp, 1) || + in6ifa_ifpwithaddr(ifp, &gw6->sin6_addr)) { + /* + * We allow this kind of tricky route only + * when the outgoing interface is p2p. + * XXX: we may need a more generic rule here. + */ + lck_mtx_unlock(rt_mtx); + if ((ifp->if_flags & IFF_POINTOPOINT) == 0) + senderr(EHOSTUNREACH); + + goto sendpkt; + } + if (rt->rt_gwroute == 0) goto lookup; if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { - rtfree(rt); rt = rt0; -#if __FreeBSD__ || defined (__APPLE__) - lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 0UL); -#else - lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); -#endif - if ((rt = rt->rt_gwroute) == 0) - senderr(EHOSTUNREACH); -#ifdef __bsdi__ - /* the "G" test below also prevents rt == rt0 */ - if ((rt->rt_flags & RTF_GATEWAY) || - (rt->rt_ifp != ifp)) { - rt->rt_refcnt--; - rt0->rt_gwroute = 0; + rtfree_locked(rt); rt = rt0; + lookup: rt->rt_gwroute = rtalloc1_locked(rt->rt_gateway, 1, 0UL); + if ((rt = rt->rt_gwroute) == 0) { + lck_mtx_unlock(rt_mtx); senderr(EHOSTUNREACH); } -#endif } } - if (rt->rt_flags & RTF_REJECT) - senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); } /* @@ -1960,20 +2022,37 @@ nd6_output(ifp, m0, dst, rt0) if (rt && (rt->rt_flags & RTF_LLINFO) != 0) ln = (struct llinfo_nd6 *)rt->rt_llinfo; else { - if ((rt = nd6_lookup(&dst->sin6_addr, 1, ifp)) != NULL) + /* + * Since nd6_is_addr_neighbor() internally calls nd6_lookup(), + * the condition below is not very efficient. But we believe + * it is tolerable, because this should be a rare case. + */ + if (nd6_is_addr_neighbor(dst, ifp, 1) && + (rt = nd6_lookup(&dst->sin6_addr, 1, ifp, 1)) != NULL) ln = (struct llinfo_nd6 *)rt->rt_llinfo; } + lck_mtx_unlock(rt_mtx); if (!ln || !rt) { - log(LOG_DEBUG, "nd6_output: can't allocate llinfo for %s " - "(ln=%p, rt=%p)\n", - ip6_sprintf(&dst->sin6_addr), ln, rt); - senderr(EIO); /* XXX: good error? */ + if ((ifp->if_flags & IFF_POINTOPOINT) == 0 && + !(nd_ifinfo[ifp->if_index].flags & ND6_IFF_PERFORMNUD)) { + log(LOG_DEBUG, + "nd6_output: can't allocate llinfo for %s " + "(ln=%p, rt=%p)\n", + ip6_sprintf(&dst->sin6_addr), ln, rt); + senderr(EIO); /* XXX: good error? */ + } + + goto sendpkt; /* send anyway */ } + getmicrotime(&timenow); + /* We don't have to do link-layer address resolution on a p2p link. */ if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && - ln->ln_state < ND6_LLINFO_REACHABLE) + ln->ln_state < ND6_LLINFO_REACHABLE) { ln->ln_state = ND6_LLINFO_STALE; + ln->ln_expire = timenow.tv_sec + nd6_gctimer; + } /* * The first time we send a packet to a neighbor whose entry is @@ -1985,12 +2064,12 @@ nd6_output(ifp, m0, dst, rt0) if (ln->ln_state == ND6_LLINFO_STALE) { ln->ln_asked = 0; ln->ln_state = ND6_LLINFO_DELAY; - ln->ln_expire = time_second + nd6_delay; + ln->ln_expire = timenow.tv_sec + nd6_delay; } /* * If the neighbor cache entry has a state other than INCOMPLETE - * (i.e. its link-layer address is already reloved), just + * (i.e. its link-layer address is already resolved), just * send the packet. */ if (ln->ln_state > ND6_LLINFO_INCOMPLETE) @@ -1998,34 +2077,76 @@ nd6_output(ifp, m0, dst, rt0) /* * There is a neighbor cache entry, but no ethernet address - * response yet. Replace the held mbuf (if any) with this + * response yet. Replace the held mbuf (if any) with this * latest one. * - * XXX Does the code conform to rate-limiting rule? - * (RFC 2461 7.2.2) + * This code conforms to the rate-limiting rule described in Section + * 7.2.2 of RFC 2461, because the timer is set correctly after sending + * an NS below. */ - if (ln->ln_state == ND6_LLINFO_WAITDELETE || - ln->ln_state == ND6_LLINFO_NOSTATE) + if (ln->ln_state == ND6_LLINFO_NOSTATE) ln->ln_state = ND6_LLINFO_INCOMPLETE; if (ln->ln_hold) m_freem(ln->ln_hold); ln->ln_hold = m; if (ln->ln_expire) { - rt->rt_flags &= ~RTF_REJECT; if (ln->ln_asked < nd6_mmaxtries && - ln->ln_expire < time_second) { + ln->ln_expire < timenow.tv_sec) { ln->ln_asked++; - ln->ln_expire = time_second + + ln->ln_expire = timenow.tv_sec + nd_ifinfo[ifp->if_index].retrans / 1000; - nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); + nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0, locked); } } return(0); sendpkt: #ifdef __APPLE__ - return (dlil_output(ifptodlt(ifp, PF_INET6), m, rt, (struct sockaddr *)dst, 0)); + + /* Make sure the HW checksum flags are cleaned before sending the packet */ + + m->m_pkthdr.csum_data = 0; + m->m_pkthdr.csum_flags = 0; + + if ((ifp->if_flags & IFF_LOOPBACK) != 0) { + m->m_pkthdr.rcvif = origifp; /* forwarding rules require the original scope_id */ + if (locked) + lck_mtx_unlock(ip6_mutex); + error = dlil_output(origifp, PF_INET6, m, (caddr_t)rt, (struct sockaddr *)dst, 0); + if (locked) + lck_mtx_lock(ip6_mutex); + return error; + } else { + /* Do not allow loopback address to wind up on a wire */ + struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); + + if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) || + IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst))) { + ip6stat.ip6s_badscope++; + /* + * Do not simply drop the packet just like a firewall -- we want the + * the application to feel the pain. + * Return ENETUNREACH like ip6_output does in some similar cases. + * This can startle the otherwise clueless process that specifies + * loopback as the source address. + */ + error = ENETUNREACH; + goto bad; + } + } + + m->m_pkthdr.rcvif = 0; + if (locked) + lck_mtx_unlock(ip6_mutex); + error = dlil_output(ifp, PF_INET6, m, (caddr_t)rt, (struct sockaddr *)dst, 0); + if (locked) + lck_mtx_lock(ip6_mutex); + return(error); #else + if ((ifp->if_flags & IFF_LOOPBACK) != 0) { + return((*ifp->if_output)(origifp, m, (struct sockaddr *)dst, + rt)); + } return((*ifp->if_output)(ifp, m, (struct sockaddr *)dst, rt)); #endif @@ -2037,43 +2158,276 @@ nd6_output(ifp, m0, dst, rt0) #undef senderr int -nd6_storelladdr(ifp, rt, m, dst, desten) - struct ifnet *ifp; - struct rtentry *rt; - struct mbuf *m; - struct sockaddr *dst; - u_char *desten; +nd6_need_cache( + struct ifnet *ifp) { + /* + * XXX: we currently do not make neighbor cache on any interface + * other than ARCnet, Ethernet, FDDI and GIF. + * + * RFC2893 says: + * - unidirectional tunnels needs no ND + */ + switch (ifp->if_type) { + case IFT_ARCNET: + case IFT_ETHER: + case IFT_FDDI: + case IFT_IEEE1394: + case IFT_L2VLAN: + case IFT_IEEE8023ADLAG: +#if IFT_IEEE80211 + case IFT_IEEE80211: +#endif + case IFT_GIF: /* XXX need more cases? */ + return(1); + default: + return(0); + } +} + +int +nd6_storelladdr( + struct ifnet *ifp, + struct rtentry *rt, + struct mbuf *m, + struct sockaddr *dst, + u_char *desten) +{ + int i; struct sockaddr_dl *sdl; if (m->m_flags & M_MCAST) { switch (ifp->if_type) { case IFT_ETHER: - case IFT_FDDI: + case IFT_FDDI: + case IFT_L2VLAN: + case IFT_IEEE8023ADLAG: +#if IFT_IEEE80211 + case IFT_IEEE80211: +#endif ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr, desten); return(1); - break; + case IFT_IEEE1394: + for (i = 0; i < ifp->if_addrlen; i++) + desten[i] = ~0; + return(1); case IFT_ARCNET: *desten = 0; return(1); default: - return(0); + return(0); /* caller will free mbuf */ } } - if (rt == NULL || - rt->rt_gateway->sa_family != AF_LINK) { + if (rt == NULL) { + /* this could happen, if we could not allocate memory */ + return(0); /* caller will free mbuf */ + } + if (rt->rt_gateway->sa_family != AF_LINK) { printf("nd6_storelladdr: something odd happens\n"); - return(0); + return(0); /* caller will free mbuf */ } sdl = SDL(rt->rt_gateway); if (sdl->sdl_alen == 0) { /* this should be impossible, but we bark here for debugging */ printf("nd6_storelladdr: sdl_alen == 0\n"); - return(0); + return(0); /* caller will free mbuf */ } bcopy(LLADDR(sdl), desten, sdl->sdl_alen); return(1); } + +extern errno_t arp_route_to_gateway_route(const struct sockaddr *net_dest, + route_t hint, route_t *out_route); + +errno_t +nd6_lookup_ipv6( + ifnet_t ifp, + const struct sockaddr_in6 *ip6_dest, + struct sockaddr_dl *ll_dest, + size_t ll_dest_len, + route_t hint, + mbuf_t packet) +{ + route_t route = hint; + errno_t result = 0; + struct sockaddr_dl *sdl = NULL; + size_t copy_len; + + if (ip6_dest->sin6_family != AF_INET6) + return EAFNOSUPPORT; + + if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) + return ENETDOWN; + + if (hint) { + result = arp_route_to_gateway_route((const struct sockaddr*)ip6_dest, hint, &route); + if (result != 0) + return result; + } + + if ((packet->m_flags & M_MCAST) != 0) { + return dlil_resolve_multi(ifp, (const struct sockaddr*)ip6_dest, + ll_dest, ll_dest_len); + } + + if (route == NULL) { + /* this could happen, if we could not allocate memory */ + return ENOBUFS; + } + + lck_mtx_lock(rt_mtx); + + if (route->rt_gateway->sa_family != AF_LINK) { + printf("nd6_lookup_ipv6: gateway address not AF_LINK\n"); + result = EADDRNOTAVAIL; + goto done; + } + + sdl = SDL(route->rt_gateway); + if (sdl->sdl_alen == 0) { + /* this should be impossible, but we bark here for debugging */ + printf("nd6_storelladdr: sdl_alen == 0\n"); + result = EHOSTUNREACH; + } + + copy_len = sdl->sdl_len <= ll_dest_len ? sdl->sdl_len : ll_dest_len; + bcopy(sdl, ll_dest, copy_len); + +done: + lck_mtx_unlock(rt_mtx); + return result; +} + +#ifndef __APPLE__ +static int nd6_sysctl_drlist SYSCTL_HANDLER_ARGS; +static int nd6_sysctl_prlist SYSCTL_HANDLER_ARGS; +SYSCTL_DECL(_net_inet6_icmp6); +SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist, + CTLFLAG_RD, nd6_sysctl_drlist, ""); +SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist, + CTLFLAG_RD, nd6_sysctl_prlist, ""); + +static int +nd6_sysctl_drlist SYSCTL_HANDLER_ARGS +{ + int error; + char buf[1024]; + struct in6_defrouter *d, *de; + struct nd_defrouter *dr; + + if (req->newptr) + return EPERM; + error = 0; + + lck_mtx_lock(nd6_mutex); + for (dr = TAILQ_FIRST(&nd_defrouter); + dr; + dr = TAILQ_NEXT(dr, dr_entry)) { + d = (struct in6_defrouter *)buf; + de = (struct in6_defrouter *)(buf + sizeof(buf)); + + if (d + 1 <= de) { + bzero(d, sizeof(*d)); + d->rtaddr.sin6_family = AF_INET6; + d->rtaddr.sin6_len = sizeof(d->rtaddr); + if (in6_recoverscope(&d->rtaddr, &dr->rtaddr, + dr->ifp) != 0) + log(LOG_ERR, + "scope error in " + "default router list (%s)\n", + ip6_sprintf(&dr->rtaddr)); + d->flags = dr->flags; + d->rtlifetime = dr->rtlifetime; + d->expire = dr->expire; + d->if_index = dr->ifp->if_index; + } else + panic("buffer too short"); + + error = SYSCTL_OUT(req, buf, sizeof(*d)); + if (error) + break; + } + lck_mtx_unlock(nd6_mutex); + return error; +} + +static int +nd6_sysctl_prlist SYSCTL_HANDLER_ARGS +{ + int error; + char buf[1024]; + struct in6_prefix *p, *pe; + struct nd_prefix *pr; + + if (req->newptr) + return EPERM; + error = 0; + + lck_mtx_lock(nd6_mutex); + + for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { + u_short advrtrs; + size_t advance; + struct sockaddr_in6 *sin6, *s6; + struct nd_pfxrouter *pfr; + + p = (struct in6_prefix *)buf; + pe = (struct in6_prefix *)(buf + sizeof(buf)); + + if (p + 1 <= pe) { + bzero(p, sizeof(*p)); + sin6 = (struct sockaddr_in6 *)(p + 1); + + p->prefix = pr->ndpr_prefix; + if (in6_recoverscope(&p->prefix, + &p->prefix.sin6_addr, pr->ndpr_ifp) != 0) + log(LOG_ERR, + "scope error in prefix list (%s)\n", + ip6_sprintf(&p->prefix.sin6_addr)); + p->raflags = pr->ndpr_raf; + p->prefixlen = pr->ndpr_plen; + p->vltime = pr->ndpr_vltime; + p->pltime = pr->ndpr_pltime; + p->if_index = pr->ndpr_ifp->if_index; + p->expire = pr->ndpr_expire; + p->refcnt = pr->ndpr_refcnt; + p->flags = pr->ndpr_stateflags; + p->origin = PR_ORIG_RA; + advrtrs = 0; + for (pfr = pr->ndpr_advrtrs.lh_first; + pfr; + pfr = pfr->pfr_next) { + if ((void *)&sin6[advrtrs + 1] > + (void *)pe) { + advrtrs++; + continue; + } + s6 = &sin6[advrtrs]; + bzero(s6, sizeof(*s6)); + s6->sin6_family = AF_INET6; + s6->sin6_len = sizeof(*sin6); + if (in6_recoverscope(s6, + &pfr->router->rtaddr, + pfr->router->ifp) != 0) + log(LOG_ERR, + "scope error in " + "prefix list (%s)\n", + ip6_sprintf(&pfr->router->rtaddr)); + advrtrs++; + } + p->advrtrs = advrtrs; + } else + panic("buffer too short"); + + advance = sizeof(*p) + sizeof(*sin6) * advrtrs; + error = SYSCTL_OUT(req, buf, advance); + if (error) + break; + } + lck_mtx_unlock(nd6_mutex); + return error; +} +#endif