X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/2d21ac55c334faf3a56e5634905ed6987fc787d4..d190cdc3f5544636abb56dc1874be391d3e1b148:/bsd/netinet6/nd6_rtr.c diff --git a/bsd/netinet6/nd6_rtr.c b/bsd/netinet6/nd6_rtr.c index 8ca259b74..0d6c9f044 100644 --- a/bsd/netinet6/nd6_rtr.c +++ b/bsd/netinet6/nd6_rtr.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2003-2007 Apple Inc. All rights reserved. + * Copyright (c) 2003-2016 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * @@ -26,9 +26,6 @@ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ -/* $FreeBSD: src/sys/netinet6/nd6_rtr.c,v 1.11 2002/04/19 04:46:23 suz Exp $ */ -/* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ */ - /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. @@ -70,9 +67,17 @@ #include #include #include -#include +#include +#include + +#include + +#include +#include +#include #include +#include #include #include #include @@ -89,44 +94,170 @@ #include -#define SDL(s) ((struct sockaddr_dl *)s) - +static void defrouter_addreq(struct nd_defrouter *, boolean_t); +static void defrouter_delreq(struct nd_defrouter *); +static struct nd_defrouter *defrtrlist_update_common(struct nd_defrouter *, + boolean_t); static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *); -static struct in6_ifaddr *in6_ifadd(struct nd_prefix *, - struct in6_addr *); + +static struct in6_ifaddr *in6_pfx_newpersistaddr(struct nd_prefix *, int, + int *); + static struct nd_pfxrouter *pfxrtr_lookup(struct nd_prefix *, struct nd_defrouter *); static void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *); -static void pfxrtr_del(struct nd_pfxrouter *); +static void pfxrtr_del(struct nd_pfxrouter *, struct nd_prefix *); static struct nd_pfxrouter *find_pfxlist_reachable_router(struct nd_prefix *); -static void defrouter_addifreq(struct ifnet *); static void nd6_rtmsg(int, struct rtentry *); -static void in6_init_address_ltimes(struct nd_prefix *ndpr, - struct in6_addrlifetime *lt6); +static int nd6_prefix_onlink_common(struct nd_prefix *, boolean_t, + unsigned int); +static struct nd_prefix *nd6_prefix_equal_lookup(struct nd_prefix *, boolean_t); +static void nd6_prefix_sync(struct ifnet *); + +static void in6_init_address_ltimes(struct nd_prefix *, + struct in6_addrlifetime *); static int rt6_deleteroute(struct radix_node *, void *); +static struct nd_defrouter *nddr_alloc(int); +static void nddr_free(struct nd_defrouter *); +static void nddr_trace(struct nd_defrouter *, int); + +static struct nd_prefix *ndpr_alloc(int); +static void ndpr_free(struct nd_prefix *); +static void ndpr_trace(struct nd_prefix *, int); + extern int nd6_recalc_reachtm_interval; -static struct ifnet *nd6_defifp; -int nd6_defifindex; +static struct ifnet *nd6_defifp = NULL; +int nd6_defifindex = 0; +static unsigned int nd6_defrouter_genid; + +int ip6_use_tempaddr = 1; /* use temp addr by default for testing now */ -int ip6_use_tempaddr = 0; +int nd6_accept_6to4 = 1; int ip6_desync_factor; u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME; u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME; /* * shorter lifetimes for debugging purposes. -int ip6_temp_preferred_lifetime = 800; -static int ip6_temp_valid_lifetime = 1800; -*/ + * u_int32_t ip6_temp_preferred_lifetime = 800; + * static u_int32_t ip6_temp_valid_lifetime = 1800; + */ int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE; -extern lck_mtx_t *rt_mtx; extern lck_mtx_t *nd6_mutex; +/* Serialization variables for single thread access to nd_prefix */ +static boolean_t nd_prefix_busy; +static void *nd_prefix_waitchan = &nd_prefix_busy; +static int nd_prefix_waiters = 0; + +/* Serialization variables for single thread access to nd_defrouter */ +static boolean_t nd_defrouter_busy; +static void *nd_defrouter_waitchan = &nd_defrouter_busy; +static int nd_defrouter_waiters = 0; + +/* RTPREF_MEDIUM has to be 0! */ +#define RTPREF_HIGH 1 +#define RTPREF_MEDIUM 0 +#define RTPREF_LOW (-1) +#define RTPREF_RESERVED (-2) +#define RTPREF_INVALID (-3) /* internal */ + +#define NDPR_TRACE_HIST_SIZE 32 /* size of trace history */ + +/* For gdb */ +__private_extern__ unsigned int ndpr_trace_hist_size = NDPR_TRACE_HIST_SIZE; + +struct nd_prefix_dbg { + struct nd_prefix ndpr_pr; /* nd_prefix */ + u_int16_t ndpr_refhold_cnt; /* # of ref */ + u_int16_t ndpr_refrele_cnt; /* # of rele */ + /* + * Circular lists of ndpr_addref and ndpr_remref callers. + */ + ctrace_t ndpr_refhold[NDPR_TRACE_HIST_SIZE]; + ctrace_t ndpr_refrele[NDPR_TRACE_HIST_SIZE]; +}; + +static unsigned int ndpr_debug; /* debug flags */ +static unsigned int ndpr_size; /* size of zone element */ +static struct zone *ndpr_zone; /* zone for nd_prefix */ + +#define NDPR_ZONE_MAX 64 /* maximum elements in zone */ +#define NDPR_ZONE_NAME "nd6_prefix" /* zone name */ + +#define NDDR_TRACE_HIST_SIZE 32 /* size of trace history */ + +/* For gdb */ +__private_extern__ unsigned int nddr_trace_hist_size = NDDR_TRACE_HIST_SIZE; + +struct nd_defrouter_dbg { + struct nd_defrouter nddr_dr; /* nd_defrouter */ + uint16_t nddr_refhold_cnt; /* # of ref */ + uint16_t nddr_refrele_cnt; /* # of rele */ + /* + * Circular lists of ndpr_addref and ndpr_remref callers. + */ + ctrace_t nddr_refhold[NDDR_TRACE_HIST_SIZE]; + ctrace_t nddr_refrele[NDDR_TRACE_HIST_SIZE]; +}; + +static unsigned int nddr_debug; /* debug flags */ +static unsigned int nddr_size; /* size of zone element */ +static struct zone *nddr_zone; /* zone for nd_defrouter */ + +#define NDDR_ZONE_MAX 64 /* maximum elements in zone */ +#define NDDR_ZONE_NAME "nd6_defrouter" /* zone name */ + +static unsigned int ndprtr_size; /* size of zone element */ +static struct zone *ndprtr_zone; /* zone for nd_pfxrouter */ + +#define NDPRTR_ZONE_MAX 64 /* maximum elements in zone */ +#define NDPRTR_ZONE_NAME "nd6_pfxrouter" /* zone name */ + +void +nd6_rtr_init(void) +{ + PE_parse_boot_argn("ifa_debug", &ndpr_debug, sizeof (ndpr_debug)); + PE_parse_boot_argn("ifa_debug", &nddr_debug, sizeof (nddr_debug)); + + ndpr_size = (ndpr_debug == 0) ? sizeof (struct nd_prefix) : + sizeof (struct nd_prefix_dbg); + ndpr_zone = zinit(ndpr_size, NDPR_ZONE_MAX * ndpr_size, 0, + NDPR_ZONE_NAME); + if (ndpr_zone == NULL) { + panic("%s: failed allocating %s", __func__, NDPR_ZONE_NAME); + /* NOTREACHED */ + } + zone_change(ndpr_zone, Z_EXPAND, TRUE); + zone_change(ndpr_zone, Z_CALLERACCT, FALSE); + + nddr_size = (nddr_debug == 0) ? sizeof (struct nd_defrouter) : + sizeof (struct nd_defrouter_dbg); + nddr_zone = zinit(nddr_size, NDDR_ZONE_MAX * nddr_size, 0, + NDDR_ZONE_NAME); + if (nddr_zone == NULL) { + panic("%s: failed allocating %s", __func__, NDDR_ZONE_NAME); + /* NOTREACHED */ + } + zone_change(nddr_zone, Z_EXPAND, TRUE); + zone_change(nddr_zone, Z_CALLERACCT, FALSE); + + ndprtr_size = sizeof (struct nd_pfxrouter); + ndprtr_zone = zinit(ndprtr_size, NDPRTR_ZONE_MAX * ndprtr_size, 0, + NDPRTR_ZONE_NAME); + if (ndprtr_zone == NULL) { + panic("%s: failed allocating %s", __func__, NDPRTR_ZONE_NAME); + /* NOTREACHED */ + } + zone_change(ndprtr_zone, Z_EXPAND, TRUE); + zone_change(ndprtr_zone, Z_CALLERACCT, FALSE); +} + /* * Receive Router Solicitation Message - just for routers. * Router solicitation/advertisement is mostly managed by userland program @@ -144,21 +275,15 @@ nd6_rs_input( struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct nd_router_solicit *nd_rs; struct in6_addr saddr6 = ip6->ip6_src; -#if 0 - struct in6_addr daddr6 = ip6->ip6_dst; -#endif char *lladdr = NULL; int lladdrlen = 0; -#if 0 - struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL; - struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL; - struct rtentry *rt = NULL; - int is_newentry; -#endif union nd_opts ndopts; + /* Expect 32-bit aligned data pointer on strict-align platforms */ + MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); + /* If I'm not a router, ignore it. */ - if (ip6_accept_rtadv != 0 || (ifp->if_eflags & IFEF_ACCEPT_RTADVD) || ip6_forwarding != 1) + if (!ip6_forwarding || !(ifp->if_eflags & IFEF_IPV6_ROUTER)) goto freeit; /* Sanity checks */ @@ -171,24 +296,29 @@ nd6_rs_input( } /* - * Don't update the neighbor cache, if src = ::. - * This indicates that the src has no IP address assigned yet. + * Don't update the neighbor cache, if src = :: or a non-neighbor. + * The former case indicates that the src has no IP address assigned + * yet. See nd6_ns_input() for the latter case. */ - if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) + if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { goto freeit; + } else { + struct sockaddr_in6 src_sa6; + + bzero(&src_sa6, sizeof (src_sa6)); + src_sa6.sin6_family = AF_INET6; + src_sa6.sin6_len = sizeof (src_sa6); + src_sa6.sin6_addr = ip6->ip6_src; + if (!nd6_is_addr_neighbor(&src_sa6, ifp, 0)) { + nd6log((LOG_INFO, "nd6_rs_input: " + "RS packet from non-neighbor\n")); + goto freeit; + } + } -#ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, icmp6len, return); nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); -#else - IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len); - if (nd_rs == NULL) { - icmp6stat.icp6s_tooshort++; - return; - } -#endif - - icmp6len -= sizeof(*nd_rs); + icmp6len -= sizeof (*nd_rs); nd6_option_init(nd_rs + 1, icmp6len, &ndopts); if (nd6_options(&ndopts) < 0) { nd6log((LOG_INFO, @@ -212,11 +342,11 @@ nd6_rs_input( nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); - freeit: +freeit: m_freem(m); return; - bad: +bad: icmp6stat.icp6s_badrs++; m_freem(m); } @@ -231,29 +361,51 @@ nd6_rs_input( void nd6_ra_input( struct mbuf *m, - int off, + int off, int icmp6len) { struct ifnet *ifp = m->m_pkthdr.rcvif; - struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; + struct nd_ifinfo *ndi = NULL; struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct nd_router_advert *nd_ra; struct in6_addr saddr6 = ip6->ip6_src; -#if 0 - struct in6_addr daddr6 = ip6->ip6_dst; - int flags; /* = nd_ra->nd_ra_flags_reserved; */ - int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0); - int is_other = ((flags & ND_RA_FLAG_OTHER) != 0); -#endif + int mcast = 0; union nd_opts ndopts; - struct nd_defrouter *dr; - struct timeval timenow; + struct nd_defrouter *dr = NULL; + u_int32_t mtu = 0; + char *lladdr = NULL; + u_int32_t lladdrlen = 0; + struct nd_prefix_list *nd_prefix_list_head = NULL; + u_int32_t nd_prefix_list_length = 0; + struct in6_ifaddr *ia6 = NULL; + struct nd_prefix_list *prfl; + struct nd_defrouter dr0; + u_int32_t advreachable; - getmicrotime(&timenow); - if (ip6_accept_rtadv == 0 && ((ifp->if_eflags & IFEF_ACCEPT_RTADVD) == 0)) + /* Expect 32-bit aligned data pointer on strict-align platforms */ + MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); + + /* + * Discard RA unless IFEF_ACCEPT_RTADV is set (as host), or when + * IFEF_IPV6_ROUTER is set (as router) but the RA is not locally + * generated. For convenience, we allow locally generated (rtadvd) + * RAs to be processed on the advertising interface, as a router. + * + * Note that we don't test against ip6_forwarding as we could be + * both a host and a router on different interfaces, hence the + * check against the per-interface flags. + */ + if (!(ifp->if_eflags & (IFEF_ACCEPT_RTADV | IFEF_IPV6_ROUTER)) || + ((ifp->if_eflags & IFEF_IPV6_ROUTER) && + (ia6 = ifa_foraddr6(&saddr6)) == NULL)) goto freeit; + if (ia6 != NULL) { + IFA_REMREF(&ia6->ia_ifa); + ia6 = NULL; + } + if (ip6->ip6_hlim != 255) { nd6log((LOG_ERR, "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", @@ -269,18 +421,10 @@ nd6_ra_input( goto bad; } -#ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, icmp6len, return); nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); -#else - IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); - if (nd_ra == NULL) { - icmp6stat.icp6s_tooshort++; - return; - } -#endif - icmp6len -= sizeof(*nd_ra); + icmp6len -= sizeof (*nd_ra); nd6_option_init(nd_ra + 1, icmp6len, &ndopts); if (nd6_options(&ndopts) < 0) { nd6log((LOG_INFO, @@ -289,18 +433,21 @@ nd6_ra_input( goto freeit; } - { - struct nd_defrouter dr0; - u_int32_t advreachable = nd_ra->nd_ra_reachable; + advreachable = nd_ra->nd_ra_reachable; + /* remember if this is a multicasted advertisement */ + if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) + mcast = 1; + + ndi = ND_IFINFO(ifp); + VERIFY((NULL != ndi) && (TRUE == ndi->initialized)); + lck_mtx_lock(&ndi->lock); + bzero(&dr0, sizeof (dr0)); dr0.rtaddr = saddr6; dr0.flags = nd_ra->nd_ra_flags_reserved; dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); - dr0.expire = timenow.tv_sec + dr0.rtlifetime; + dr0.expire = net_uptime() + dr0.rtlifetime; dr0.ifp = ifp; - dr0.advint = 0; /* Mobile IPv6 */ - dr0.advint_expire = 0; /* Mobile IPv6 */ - dr0.advints_lost = 0; /* Mobile IPv6 */ /* unspecified or not? (RFC 2461 6.3.4) */ if (advreachable) { advreachable = ntohl(advreachable); @@ -313,10 +460,22 @@ nd6_ra_input( } if (nd_ra->nd_ra_retransmit) ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); - if (nd_ra->nd_ra_curhoplimit) - ndi->chlim = nd_ra->nd_ra_curhoplimit; + if (nd_ra->nd_ra_curhoplimit) { + if (ndi->chlim < nd_ra->nd_ra_curhoplimit) { + ndi->chlim = nd_ra->nd_ra_curhoplimit; + } else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) { + nd6log((LOG_ERR, + "RA with a lower CurHopLimit sent from " + "%s on %s (current = %d, received = %d). " + "Ignored.\n", ip6_sprintf(&ip6->ip6_src), + if_name(ifp), ndi->chlim, + nd_ra->nd_ra_curhoplimit)); + } + } + lck_mtx_unlock(&ndi->lock); + lck_mtx_lock(nd6_mutex); dr = defrtrlist_update(&dr0); - } + lck_mtx_unlock(nd6_mutex); /* * prefix @@ -327,9 +486,12 @@ nd6_ra_input( struct nd_prefix pr; for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; - pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; - pt = (struct nd_opt_hdr *)((caddr_t)pt + - (pt->nd_opt_len << 3))) { + pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; + pt = (struct nd_opt_hdr *)((caddr_t)pt + + (pt->nd_opt_len << 3))) { + struct in6_addr pi_mask; + bzero(&pi_mask, sizeof(pi_mask)); + if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) continue; pi = (struct nd_opt_prefix_info *)pt; @@ -350,45 +512,109 @@ nd6_ra_input( continue; } - if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) - || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { - nd6log((LOG_INFO, - "nd6_ra_input: invalid prefix " - "%s, ignored\n", - ip6_sprintf(&pi->nd_opt_pi_prefix))); - continue; - } - - /* aggregatable unicast address, rfc2374 */ - if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20 - && pi->nd_opt_pi_prefix_len != 64) { + /* + * To ignore ::/64 make sure bits beyond prefixlen + * are set to zero + */ + in6_prefixlen2mask(&pi_mask, pi->nd_opt_pi_prefix_len); + pi->nd_opt_pi_prefix.s6_addr32[0] &= pi_mask.s6_addr32[0]; + pi->nd_opt_pi_prefix.s6_addr32[1] &= pi_mask.s6_addr32[1]; + pi->nd_opt_pi_prefix.s6_addr32[2] &= pi_mask.s6_addr32[2]; + pi->nd_opt_pi_prefix.s6_addr32[3] &= pi_mask.s6_addr32[3]; + + if (IN6_IS_ADDR_UNSPECIFIED(&pi->nd_opt_pi_prefix) || + IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) || + IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { nd6log((LOG_INFO, - "nd6_ra_input: invalid prefixlen " - "%d for rfc2374 prefix %s, ignored\n", - pi->nd_opt_pi_prefix_len, + "%s: invalid prefix %s, ignored\n", + __func__, ip6_sprintf(&pi->nd_opt_pi_prefix))); continue; } - bzero(&pr, sizeof(pr)); + bzero(&pr, sizeof (pr)); + lck_mtx_init(&pr.ndpr_lock, ifa_mtx_grp, ifa_mtx_attr); + NDPR_LOCK(&pr); pr.ndpr_prefix.sin6_family = AF_INET6; - pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); + pr.ndpr_prefix.sin6_len = sizeof (pr.ndpr_prefix); pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; pr.ndpr_ifp = m->m_pkthdr.rcvif; pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & - ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; + ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & - ND_OPT_PI_FLAG_AUTO) ? 1 : 0; + ND_OPT_PI_FLAG_AUTO) ? 1 : 0; pr.ndpr_plen = pi->nd_opt_pi_prefix_len; pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time); - if (in6_init_prefix_ltimes(&pr)) + /* + * Exceptions to stateless autoconfiguration processing: + * + nd6_accept_6to4 == 0 && address has 6to4 prefix + * + ip6_only_allow_rfc4193_prefix != 0 && + * address not RFC 4193 + */ + if (ip6_only_allow_rfc4193_prefix && + !IN6_IS_ADDR_UNIQUE_LOCAL(&pi->nd_opt_pi_prefix)) { + nd6log((LOG_INFO, + "nd6_ra_input: no SLAAC on prefix %s " + "[not RFC 4193]\n", + ip6_sprintf(&pi->nd_opt_pi_prefix))); + pr.ndpr_raf_auto = 0; + } else if (!nd6_accept_6to4 && + IN6_IS_ADDR_6TO4(&pi->nd_opt_pi_prefix)) { + nd6log((LOG_INFO, + "%s: no SLAAC on prefix %s " + "[6to4]\n", __func__, + ip6_sprintf(&pi->nd_opt_pi_prefix))); + pr.ndpr_raf_auto = 0; + } + + if (in6_init_prefix_ltimes(&pr)) { + NDPR_UNLOCK(&pr); + lck_mtx_destroy(&pr.ndpr_lock, ifa_mtx_grp); continue; /* prefix lifetime init failed */ + } else { + NDPR_UNLOCK(&pr); + } + (void) prelist_update(&pr, dr, m, mcast); + lck_mtx_destroy(&pr.ndpr_lock, ifa_mtx_grp); + + /* + * We have to copy the values out after the + * prelist_update call since some of these values won't + * be properly set until after the router advertisement + * updating can vet the values. + */ + prfl = NULL; + MALLOC(prfl, struct nd_prefix_list *, sizeof (*prfl), + M_TEMP, M_WAITOK | M_ZERO); + + if (prfl == NULL) { + log(LOG_DEBUG, "%s: unable to MALLOC RA prefix " + "structure\n", __func__); + continue; + } - (void)prelist_update(&pr, dr, m); + /* this is only for nd6_post_msg(), otherwise unused */ + bcopy(&pr.ndpr_prefix, &prfl->pr.ndpr_prefix, + sizeof (prfl->pr.ndpr_prefix)); + prfl->pr.ndpr_raf = pr.ndpr_raf; + prfl->pr.ndpr_plen = pr.ndpr_plen; + prfl->pr.ndpr_vltime = pr.ndpr_vltime; + prfl->pr.ndpr_pltime = pr.ndpr_pltime; + prfl->pr.ndpr_expire = pr.ndpr_expire; + prfl->pr.ndpr_base_calendartime = + pr.ndpr_base_calendartime; + prfl->pr.ndpr_base_uptime = pr.ndpr_base_uptime; + prfl->pr.ndpr_stateflags = pr.ndpr_stateflags; + prfl->pr.ndpr_addrcnt = pr.ndpr_addrcnt; + prfl->pr.ndpr_ifp = pr.ndpr_ifp; + + prfl->next = nd_prefix_list_head; + nd_prefix_list_head = prfl; + nd_prefix_list_length++; } } @@ -396,7 +622,7 @@ nd6_ra_input( * MTU */ if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { - u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); + mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); /* lower bound */ if (mtu < IPV6_MMTU) { @@ -406,12 +632,14 @@ nd6_ra_input( goto skip; } + lck_mtx_lock(&ndi->lock); /* upper bound */ if (ndi->maxmtu) { if (mtu <= ndi->maxmtu) { int change = (ndi->linkmtu != mtu); ndi->linkmtu = mtu; + lck_mtx_unlock(&ndi->lock); if (change) /* in6_maxmtu may change */ in6_setmaxmtu(); } else { @@ -420,8 +648,10 @@ nd6_ra_input( "exceeds maxmtu %d, ignoring\n", mtu, ip6_sprintf(&ip6->ip6_src), ndi->maxmtu)); + lck_mtx_unlock(&ndi->lock); } } else { + lck_mtx_unlock(&ndi->lock); nd6log((LOG_INFO, "nd6_ra_input: mtu option " "mtu=%d sent from %s; maxmtu unknown, " "ignoring\n", @@ -429,15 +659,11 @@ nd6_ra_input( } } - skip: - +skip: + /* * Source link layer address */ - { - char *lladdr = NULL; - int lladdrlen = 0; - if (ndopts.nd_opts_src_lladdr) { lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; @@ -451,23 +677,41 @@ nd6_ra_input( goto bad; } - nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); + if (dr && dr->stateflags & NDDRF_MAPPED) + saddr6 = dr->rtaddr_mapped; + + nd6_cache_lladdr(ifp, &saddr6, lladdr, (int)lladdrlen, + ND_ROUTER_ADVERT, 0); + + /* Post message */ + nd6_post_msg(KEV_ND6_RA, nd_prefix_list_head, nd_prefix_list_length, + mtu, lladdr, lladdrlen); /* * Installing a link-layer address might change the state of the * router's neighbor cache, which might also affect our on-link * detection of adveritsed prefixes. */ - pfxlist_onlink_check(0); - } + lck_mtx_lock(nd6_mutex); + pfxlist_onlink_check(); + lck_mtx_unlock(nd6_mutex); - freeit: +freeit: m_freem(m); + if (dr) + NDDR_REMREF(dr); + + prfl = NULL; + while ((prfl = nd_prefix_list_head) != NULL) { + nd_prefix_list_head = prfl->next; + FREE(prfl, M_TEMP); + } + return; - bad: +bad: icmp6stat.icp6s_badra++; - m_freem(m); + goto freeit; } /* @@ -476,103 +720,131 @@ nd6_ra_input( /* tell the change to user processes watching the routing socket. */ static void -nd6_rtmsg(cmd, rt) - int cmd; - struct rtentry *rt; +nd6_rtmsg(int cmd, struct rtentry *rt) { struct rt_addrinfo info; + struct ifnet *ifp = rt->rt_ifp; - lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_OWNED); + RT_LOCK_ASSERT_HELD(rt); - bzero((caddr_t)&info, sizeof(info)); + bzero((caddr_t)&info, sizeof (info)); + /* It's not necessary to lock ifp for if_lladdr */ info.rti_info[RTAX_DST] = rt_key(rt); info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; info.rti_info[RTAX_NETMASK] = rt_mask(rt); - info.rti_info[RTAX_IFP] = - TAILQ_FIRST(&rt->rt_ifp->if_addrlist)->ifa_addr; + /* + * ifa_addr pointers for both should always be valid + * in this context; no need to hold locks. + */ + info.rti_info[RTAX_IFP] = ifp->if_lladdr->ifa_addr; info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; rt_missmsg(cmd, &info, rt->rt_flags, 0); } -void -defrouter_addreq( - struct nd_defrouter *new) +static void +defrouter_addreq(struct nd_defrouter *new, boolean_t scoped) { struct sockaddr_in6 def, mask, gate; struct rtentry *newrt = NULL; + unsigned int ifscope; + int err; + struct nd_ifinfo *ndi = ND_IFINFO(new->ifp); - Bzero(&def, sizeof(def)); - Bzero(&mask, sizeof(mask)); - Bzero(&gate, sizeof(gate)); + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED); + NDDR_LOCK_ASSERT_NOTHELD(new); + /* + * We're free to lock and unlock NDDR because our callers + * are holding an extra reference for us. + */ - def.sin6_len = mask.sin6_len = gate.sin6_len - = sizeof(struct sockaddr_in6); - def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; - gate.sin6_addr = new->rtaddr; + NDDR_LOCK(new); + if (new->stateflags & NDDRF_INSTALLED) + goto out; - lck_mtx_lock(rt_mtx); - (void)rtrequest_locked(RTM_ADD, (struct sockaddr *)&def, - (struct sockaddr *)&gate, (struct sockaddr *)&mask, - RTF_GATEWAY, &newrt); - if (newrt) { - nd6_rtmsg(RTM_ADD, newrt); /* tell user process */ - rtunref(newrt); + if (new->ifp->if_eflags & IFEF_IPV6_ROUTER) { + nd6log2((LOG_INFO, "%s: ignoring router %s, scoped=%d, " + "static=%d on advertising interface\n", if_name(new->ifp), + ip6_sprintf(&new->rtaddr), scoped, + (new->stateflags & NDDRF_STATIC) ? 1 : 0)); + goto out; } - lck_mtx_unlock(rt_mtx); - return; -} -/* Add a route to a given interface as default */ -void -defrouter_addifreq( - struct ifnet *ifp) -{ - struct sockaddr_in6 def, mask; - struct ifaddr *ifa = NULL; - struct rtentry *newrt = NULL; - int error; - u_long flags; + nd6log2((LOG_INFO, "%s: adding default router %s, scoped=%d, " + "static=%d\n", if_name(new->ifp), ip6_sprintf(&new->rtaddr), + scoped, (new->stateflags & NDDRF_STATIC) ? 1 : 0)); + + Bzero(&def, sizeof (def)); + Bzero(&mask, sizeof (mask)); + Bzero(&gate, sizeof (gate)); + + def.sin6_len = mask.sin6_len = gate.sin6_len + = sizeof (struct sockaddr_in6); + def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; - bzero(&def, sizeof(def)); - bzero(&mask, sizeof(mask)); + if (new->stateflags & NDDRF_MAPPED) + gate.sin6_addr = new->rtaddr_mapped; + else + gate.sin6_addr = new->rtaddr; - def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6); - def.sin6_family = mask.sin6_family = AF_INET6; + ifscope = scoped ? new->ifp->if_index : IFSCOPE_NONE; + NDDR_UNLOCK(new); /* - * Search for an ifaddr beloging to the specified interface. - * XXX: An IPv6 address are required to be assigned on the interface. + * Cellular networks may have buggy deployments + * with gateway IPv6 link local address with same + * interface identifier as the one that has been + * assigned for the cellular context. + * If gateway is same as locally configured link local + * interface on cellular interface, generated a different one + * and store it in the nd_defrouter entry and use it to work + * on routing table */ - if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) { - nd6log((LOG_ERR, /* better error? */ - "defrouter_addifreq: failed to find an ifaddr " - "to install a route to interface %s\n", - if_name(ifp))); - return; + if (new->ifp->if_type == IFT_CELLULAR && + !(new->stateflags & NDDRF_STATIC) && + !(new->stateflags & NDDRF_MAPPED) && + IN6_IS_ADDR_LINKLOCAL(&gate.sin6_addr) && + ndi && !(ndi->flags & ND6_IFF_PERFORMNUD)) { + struct in6_ifaddr *tmp_ia6 = in6ifa_ifpforlinklocal(new->ifp, 0); + + if (tmp_ia6 != NULL && + !(tmp_ia6->ia6_flags & IN6_IFF_NOTMANUAL) && + IN6_ARE_ADDR_EQUAL(&tmp_ia6->ia_addr.sin6_addr, + &gate.sin6_addr)) { + gate.sin6_addr.s6_addr8[15] += 1; + new->rtaddr_mapped = gate.sin6_addr; + new->stateflags |= NDDRF_MAPPED; + + nd6log((LOG_INFO, "%s: Default router %s mapped " + "to ", if_name(new->ifp), ip6_sprintf(&new->rtaddr))); + nd6log((LOG_INFO, "%s\n", ip6_sprintf(&new->rtaddr_mapped))); + } } - lck_mtx_lock(rt_mtx); - flags = ifa->ifa_flags; - error = rtrequest_locked(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr, - (struct sockaddr *)&mask, flags, &newrt); - if (error != 0) { - nd6log((LOG_ERR, - "defrouter_addifreq: failed to install a route to " - "interface %s (errno = %d)\n", - if_name(ifp), error)); + err = rtrequest_scoped(RTM_ADD, (struct sockaddr *)&def, + (struct sockaddr *)&gate, (struct sockaddr *)&mask, + RTF_GATEWAY, &newrt, ifscope); - if (newrt) /* maybe unnecessary, but do it for safety */ - rtunref(newrt); + if (newrt) { + RT_LOCK(newrt); + nd6_rtmsg(RTM_ADD, newrt); /* tell user process */ + RT_REMREF_LOCKED(newrt); + RT_UNLOCK(newrt); + NDDR_LOCK(new); + new->stateflags |= NDDRF_INSTALLED; + if (ifscope != IFSCOPE_NONE) + new->stateflags |= NDDRF_IFSCOPE; } else { - if (newrt) { - nd6_rtmsg(RTM_ADD, newrt); - rtunref(newrt); - } - in6_post_msg(ifp, KEV_INET6_DEFROUTER, (struct in6_ifaddr *)ifa); + nd6log((LOG_ERR, "%s: failed to add default router " + "%s on %s scoped %d (errno = %d)\n", __func__, + ip6_sprintf(&gate.sin6_addr), if_name(new->ifp), + (ifscope != IFSCOPE_NONE), err)); + NDDR_LOCK(new); } - lck_mtx_unlock(rt_mtx); - ifafree(ifa); + new->err = err; + +out: + NDDR_UNLOCK(new); } struct nd_defrouter * @@ -582,347 +854,1094 @@ defrouter_lookup( { struct nd_defrouter *dr; - lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); for (dr = TAILQ_FIRST(&nd_defrouter); dr; - dr = TAILQ_NEXT(dr, dr_entry)) { - if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) - return(dr); + dr = TAILQ_NEXT(dr, dr_entry)) { + NDDR_LOCK(dr); + if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) { + NDDR_ADDREF_LOCKED(dr); + NDDR_UNLOCK(dr); + return (dr); + } + NDDR_UNLOCK(dr); } - return(NULL); /* search failed */ + return (NULL); /* search failed */ } -void -defrouter_delreq( - struct nd_defrouter *dr, - int dofree) +/* + * Remove the default route for a given router. + * This is just a subroutine function for defrouter_select(), and should + * not be called from anywhere else. + */ +static void +defrouter_delreq(struct nd_defrouter *dr) { struct sockaddr_in6 def, mask, gate; struct rtentry *oldrt = NULL; + unsigned int ifscope; + int err; - Bzero(&def, sizeof(def)); - Bzero(&mask, sizeof(mask)); - Bzero(&gate, sizeof(gate)); + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED); + NDDR_LOCK_ASSERT_NOTHELD(dr); + /* + * We're free to lock and unlock NDDR because our callers + * are holding an extra reference for us. + */ + NDDR_LOCK(dr); + /* ifp would be NULL for the "drany" case */ + if (dr->ifp != NULL && !(dr->stateflags & NDDRF_INSTALLED)) + goto out; + + nd6log2((LOG_INFO, "%s: removing default router %s, scoped=%d, " + "static=%d\n", dr->ifp != NULL ? if_name(dr->ifp) : "ANY", + ip6_sprintf(&dr->rtaddr), (dr->stateflags & NDDRF_IFSCOPE) ? 1 : 0, + (dr->stateflags & NDDRF_STATIC) ? 1 : 0)); + + Bzero(&def, sizeof (def)); + Bzero(&mask, sizeof (mask)); + Bzero(&gate, sizeof (gate)); def.sin6_len = mask.sin6_len = gate.sin6_len - = sizeof(struct sockaddr_in6); + = sizeof (struct sockaddr_in6); def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; - gate.sin6_addr = dr->rtaddr; - lck_mtx_lock(rt_mtx); - rtrequest_locked(RTM_DELETE, (struct sockaddr *)&def, - (struct sockaddr *)&gate, - (struct sockaddr *)&mask, - RTF_GATEWAY, &oldrt); + /* + * The router entry may be mapped to a different address. + * If that is the case, use the mapped address as gateway + * to do operation on the routing table. + * To get more context, read the related comment in + * defrouter_addreq + */ + if (dr->stateflags & NDDRF_MAPPED) + gate.sin6_addr = dr->rtaddr_mapped; + else + gate.sin6_addr = dr->rtaddr; + + if (dr->ifp != NULL) { + ifscope = (dr->stateflags & NDDRF_IFSCOPE) ? + dr->ifp->if_index : IFSCOPE_NONE; + } else { + ifscope = IFSCOPE_NONE; + } + NDDR_UNLOCK(dr); + + err = rtrequest_scoped(RTM_DELETE, + (struct sockaddr *)&def, (struct sockaddr *)&gate, + (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, ifscope); + if (oldrt) { + RT_LOCK(oldrt); nd6_rtmsg(RTM_DELETE, oldrt); - rtfree_locked(oldrt); + RT_UNLOCK(oldrt); + rtfree(oldrt); + } else if (err != ESRCH) { + nd6log((LOG_ERR, "%s: failed to delete default router " + "%s on %s scoped %d (errno = %d)\n", __func__, + ip6_sprintf(&gate.sin6_addr), dr->ifp != NULL ? + if_name(dr->ifp) : "ANY", (ifscope != IFSCOPE_NONE), err)); + } + NDDR_LOCK(dr); + /* ESRCH means it's no longer in the routing table; ignore it */ + if (oldrt != NULL || err == ESRCH) { + dr->stateflags &= ~NDDRF_INSTALLED; + if (ifscope != IFSCOPE_NONE) + dr->stateflags &= ~NDDRF_IFSCOPE; + } + dr->err = 0; +out: + NDDR_UNLOCK(dr); +} + + +/* + * remove all default routes from default router list + */ +void +defrouter_reset(void) +{ + struct nd_defrouter *dr, drany; + + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + + dr = TAILQ_FIRST(&nd_defrouter); + while (dr) { + NDDR_LOCK(dr); + if (dr->stateflags & NDDRF_INSTALLED) { + NDDR_ADDREF_LOCKED(dr); + NDDR_UNLOCK(dr); + lck_mtx_unlock(nd6_mutex); + defrouter_delreq(dr); + lck_mtx_lock(nd6_mutex); + NDDR_REMREF(dr); + dr = TAILQ_FIRST(&nd_defrouter); + } else { + NDDR_UNLOCK(dr); + dr = TAILQ_NEXT(dr, dr_entry); + } + } + + /* Nuke primary (non-scoped) default router */ + bzero(&drany, sizeof (drany)); + lck_mtx_init(&drany.nddr_lock, ifa_mtx_grp, ifa_mtx_attr); + lck_mtx_unlock(nd6_mutex); + defrouter_delreq(&drany); + lck_mtx_destroy(&drany.nddr_lock, ifa_mtx_grp); + lck_mtx_lock(nd6_mutex); +} + +int +defrtrlist_ioctl(u_long cmd, caddr_t data) +{ + struct nd_defrouter dr0; + unsigned int ifindex; + struct ifnet *dr_ifp; + int error = 0, add = 0; + + /* XXX Handle mapped default router entries */ + switch (cmd) { + case SIOCDRADD_IN6_32: /* struct in6_defrouter_32 */ + case SIOCDRADD_IN6_64: /* struct in6_defrouter_64 */ + ++add; + /* FALLTHRU */ + case SIOCDRDEL_IN6_32: /* struct in6_defrouter_32 */ + case SIOCDRDEL_IN6_64: /* struct in6_defrouter_64 */ + bzero(&dr0, sizeof (dr0)); + if (cmd == SIOCDRADD_IN6_64 || cmd == SIOCDRDEL_IN6_64) { + struct in6_defrouter_64 *r_64 = + (struct in6_defrouter_64 *)(void *)data; + u_int16_t i; + + bcopy(&r_64->rtaddr.sin6_addr, &dr0.rtaddr, + sizeof (dr0.rtaddr)); + dr0.flags = r_64->flags; + bcopy(&r_64->if_index, &i, sizeof (i)); + ifindex = i; + } else { + struct in6_defrouter_32 *r_32 = + (struct in6_defrouter_32 *)(void *)data; + u_int16_t i; + + bcopy(&r_32->rtaddr.sin6_addr, &dr0.rtaddr, + sizeof (dr0.rtaddr)); + dr0.flags = r_32->flags; + bcopy(&r_32->if_index, &i, sizeof (i)); + ifindex = i; + } + ifnet_head_lock_shared(); + /* Don't need to check is ifindex is < 0 since it's unsigned */ + if (if_index < ifindex || + (dr_ifp = ifindex2ifnet[ifindex]) == NULL) { + ifnet_head_done(); + error = EINVAL; + break; + } + dr0.ifp = dr_ifp; + ifnet_head_done(); + + if (IN6_IS_SCOPE_EMBED(&dr0.rtaddr)) { + uint16_t *scope = &dr0.rtaddr.s6_addr16[1]; + + if (*scope == 0) { + *scope = htons(dr_ifp->if_index); + } else if (*scope != htons(dr_ifp->if_index)) { + error = EINVAL; + break; + } + } + + if (add) + error = defrtrlist_add_static(&dr0); + if (!add || error != 0) { + int err = defrtrlist_del_static(&dr0); + if (!add) + error = err; + } + break; + + default: + error = EOPNOTSUPP; /* check for safety */ + break; } - if (dofree) /* XXX: necessary? */ - FREE(dr, M_IP6NDP); - lck_mtx_unlock(rt_mtx); + return (error); } +/* + * XXX Please make sure to remove dr from the + * global default router tailq list before this + * function call. + * Also ensure that you release the list reference + * only after calling this routine. + */ void -defrtrlist_del( - struct nd_defrouter *dr, int nd6locked) +defrtrlist_del(struct nd_defrouter *dr) { - struct nd_defrouter *deldr = NULL; +#if (DEVELOPMENT || DEBUG) + struct nd_defrouter *dr_itr = NULL; +#endif struct nd_prefix *pr; + struct ifnet *ifp = dr->ifp; + struct nd_ifinfo *ndi = NULL; + boolean_t resetmtu; + + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); +#if (DEVELOPMENT || DEBUG) + /* + * Verify that the router is not in the global default + * router list. + * Can't use defrouter_lookup here because that just works + * with address and ifp pointer. + * We have to compare the memory here. + * Also we can't use ASSERT here as that is not defined + * for development builds. + */ + TAILQ_FOREACH(dr_itr, &nd_defrouter, dr_entry) + VERIFY(dr != dr_itr); +#endif + ++nd6_defrouter_genid; /* * Flush all the routing table entries that use the router * as a next hop. */ - if (!ip6_forwarding && (ip6_accept_rtadv || (dr->ifp->if_eflags & IFEF_ACCEPT_RTADVD))) { - /* above is a good condition? */ - rt6_flush(&dr->rtaddr, dr->ifp); - } - - if (nd6locked == 0) - lck_mtx_lock(nd6_mutex); - if (dr == TAILQ_FIRST(&nd_defrouter)) - deldr = dr; /* The router is primary. */ + /* above is a good condition? */ + NDDR_ADDREF(dr); + lck_mtx_unlock(nd6_mutex); + if (dr->stateflags & NDDRF_MAPPED) + rt6_flush(&dr->rtaddr_mapped, ifp); + else + rt6_flush(&dr->rtaddr, ifp); - TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); + lck_mtx_lock(nd6_mutex); + NDDR_REMREF(dr); + nd6log2((LOG_INFO, "%s: freeing defrouter %s\n", if_name(dr->ifp), + ip6_sprintf(&dr->rtaddr))); + /* + * Delete it from the routing table. + */ + NDDR_ADDREF(dr); + lck_mtx_unlock(nd6_mutex); + defrouter_delreq(dr); + lck_mtx_lock(nd6_mutex); + NDDR_REMREF(dr); /* * Also delete all the pointers to the router in each prefix lists. */ for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { struct nd_pfxrouter *pfxrtr; + + NDPR_LOCK(pr); if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) - pfxrtr_del(pfxrtr); + pfxrtr_del(pfxrtr, pr); + NDPR_UNLOCK(pr); + } + + pfxlist_onlink_check(); + + resetmtu = FALSE; + ndi = ND_IFINFO(ifp); + VERIFY((NULL != ndi) && (TRUE == ndi->initialized)); + lck_mtx_lock(&ndi->lock); + VERIFY(ndi->ndefrouters >= 0); + if (ndi->ndefrouters > 0 && --ndi->ndefrouters == 0) { + nd6_ifreset(ifp); + resetmtu = TRUE; } - pfxlist_onlink_check(1); + lck_mtx_unlock(&ndi->lock); /* * If the router is the primary one, choose a new one. - * Note that defrouter_select() will remove the current gateway - * from the routing table. + * We always try to pick another eligible router + * on this interface as we do scoped routing */ - if (deldr) - defrouter_select(); + defrouter_select(ifp); - if (nd6locked == 0) - lck_mtx_unlock(nd6_mutex); + if (resetmtu) + nd6_setmtu(ifp); +} + +int +defrtrlist_add_static(struct nd_defrouter *new) +{ + struct nd_defrouter *dr; + int err = 0; + + new->rtlifetime = -1; + new->stateflags |= NDDRF_STATIC; + + /* we only want the preference level */ + new->flags &= ND_RA_FLAG_RTPREF_MASK; + + lck_mtx_lock(nd6_mutex); + dr = defrouter_lookup(&new->rtaddr, new->ifp); + if (dr != NULL && !(dr->stateflags & NDDRF_STATIC)) { + err = EINVAL; + } else { + if (dr != NULL) + NDDR_REMREF(dr); + dr = defrtrlist_update(new); + if (dr != NULL) + err = dr->err; + else + err = ENOMEM; + } + if (dr != NULL) + NDDR_REMREF(dr); + lck_mtx_unlock(nd6_mutex); + + return (err); +} + +int +defrtrlist_del_static(struct nd_defrouter *new) +{ + struct nd_defrouter *dr; + + lck_mtx_lock(nd6_mutex); + dr = defrouter_lookup(&new->rtaddr, new->ifp); + if (dr == NULL || !(dr->stateflags & NDDRF_STATIC)) { + if (dr != NULL) + NDDR_REMREF(dr); + dr = NULL; + } else { + TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); + defrtrlist_del(dr); + NDDR_REMREF(dr); /* remove list reference */ + NDDR_REMREF(dr); + } + lck_mtx_unlock(nd6_mutex); + + return (dr != NULL ? 0 : EINVAL); +} - FREE(dr, M_IP6NDP); +/* + * for default router selection + * regards router-preference field as a 2-bit signed integer + */ +static int +rtpref(struct nd_defrouter *dr) +{ + switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) { + case ND_RA_FLAG_RTPREF_HIGH: + return (RTPREF_HIGH); + case ND_RA_FLAG_RTPREF_MEDIUM: + case ND_RA_FLAG_RTPREF_RSV: + return (RTPREF_MEDIUM); + case ND_RA_FLAG_RTPREF_LOW: + return (RTPREF_LOW); + default: + /* + * This case should never happen. If it did, it would mean a + * serious bug of kernel internal. We thus always bark here. + * Or, can we even panic? + */ + log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->flags); + return (RTPREF_INVALID); + } + /* NOTREACHED */ } /* - * Default Router Selection according to Section 6.3.6 of RFC 2461: - * 1) Routers that are reachable or probably reachable should be - * preferred. + * Default Router Selection according to Section 6.3.6 of RFC 2461 and RFC 4191: + * + * 1) Routers that are reachable or probably reachable should be preferred. + * If we have more than one (probably) reachable router, prefer ones + * with the highest router preference. * 2) When no routers on the list are known to be reachable or * probably reachable, routers SHOULD be selected in a round-robin - * fashion. + * fashion, regardless of router preference values. * 3) If the Default Router List is empty, assume that all * destinations are on-link. + * + * When Scoped Routing is enabled, the selection logic is amended as follows: + * + * a) When a default interface is specified, the primary/non-scoped default + * router will be set to the reachable router on that link (if any) with + * the highest router preference. + * b) When there are more than one routers on the same link, the one with + * the highest router preference will be installed, either as scoped or + * non-scoped route entry. If they all share the same preference value, + * the one installed will be the static or the first encountered reachable + * router, i.e. static one wins over dynamic. + * c) When no routers on the list are known to be reachable, or probably + * reachable, no round-robin selection will take place when the default + * interface is set. + * + * We assume nd_defrouter is sorted by router preference value. + * Since the code below covers both with and without router preference cases, + * we do not need to classify the cases by ifdef. */ void -defrouter_select() +defrouter_select(struct ifnet *ifp) { - struct nd_defrouter *dr, anydr; - struct rtentry *rt = NULL; + struct nd_defrouter *dr = NULL; + struct nd_defrouter *selected_dr = NULL; + struct nd_defrouter *installed_dr = NULL; struct llinfo_nd6 *ln = NULL; + struct rtentry *rt = NULL; + struct nd_ifinfo *ndi = NULL; + unsigned int genid = 0; + boolean_t is_installed_reachable = FALSE; - /* - * Search for a (probably) reachable router from the list. - */ lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); - for (dr = TAILQ_FIRST(&nd_defrouter); dr; - dr = TAILQ_NEXT(dr, dr_entry)) { - if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp, 0)) && - (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && - ND6_IS_LLINFO_PROBREACH(ln)) { - /* Got it, and move it to the head */ - TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); - TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry); - break; - } + if (ifp == NULL) { + nd6log2((LOG_INFO, + "%s:%d: Return early. NULL interface", + __func__, __LINE__)); + return; } - if ((dr = TAILQ_FIRST(&nd_defrouter))) { - /* - * De-install the previous default gateway and install - * a new one. - * Note that if there is no reachable router in the list, - * the head entry will be used anyway. - * XXX: do we have to check the current routing table entry? - */ - bzero(&anydr, sizeof(anydr)); - defrouter_delreq(&anydr, 0); - defrouter_addreq(dr); + if (ifp == lo_ifp) { + nd6log2((LOG_INFO, + "%s:%d: Return early. " + "Default router select called for loopback.\n", + __func__, __LINE__)); + return; } - else { + + if (ifp->if_eflags & IFEF_IPV6_ROUTER) { + nd6log2((LOG_INFO, + "%s:%d: Return early. " + "Default router select called for interface" + " %s with IFEF_IPV6_ROUTER flag set\n", + __func__, __LINE__, if_name(ifp))); + return; + } + + /* + * Let's handle easy case (3) first: + * If default router list is empty, there's nothing to be done. + */ + if (!TAILQ_FIRST(&nd_defrouter)) { + nd6log2((LOG_INFO, + "%s:%d: Return early. " + "Default router is empty.\n", __func__, __LINE__)); + return; + } + + /* + * Take an early exit if number of routers in nd_ifinfo is + * 0 for the interface. + */ + ndi = ND_IFINFO(ifp); + if (!ndi || !ndi->initialized) { + nd6log2((LOG_INFO, + "%s:%d: Return early. " + "Interface %s's nd_ifinfo not initialized.\n", + __func__, __LINE__, if_name(ifp))); + return; + } + + if (ndi->ndefrouters == 0) { + nd6log2((LOG_INFO, + "%s:%d: Return early. " + "%s does not have any default routers.\n", + __func__, __LINE__, if_name(ifp))); + return; + } + + /* + * Due to the number of times we drop nd6_mutex, we need to + * serialize this function. + */ + while (nd_defrouter_busy) { + nd_defrouter_waiters++; + msleep(nd_defrouter_waitchan, nd6_mutex, (PZERO-1), + __func__, NULL); + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + } + nd_defrouter_busy = TRUE; + + /* + * Search for a (probably) reachable router from the list. + * We just pick up the first reachable one (if any), assuming that + * the ordering rule of the list described in defrtrlist_update(). + * + * For all intents and purposes of Scoped Routing: + * selected_dr = candidate for primary router + * installed_dr = currently installed primary router + */ + genid = nd6_defrouter_genid; + dr = TAILQ_FIRST(&nd_defrouter); + + while (dr != NULL) { + struct in6_addr rtaddr; + struct ifnet *drifp = NULL; + struct nd_defrouter *drrele = NULL; + + NDDR_LOCK(dr); + drifp = dr->ifp; + if (drifp != ifp) { + NDDR_UNLOCK(dr); + dr = TAILQ_NEXT(dr, dr_entry); + continue; + } + + /* + * Optimize for the common case. + * When the interface has only one default router + * there's no point checking for reachability as + * there's nothing else to choose from. + */ + if (ndi->ndefrouters == 1) { + nd6log2((LOG_INFO, + "%s:%d: Fast forward default router selection " + "as interface %s has learned only one default " + "router and there's nothing else to choose from.\n", + __func__, __LINE__, if_name(ifp))); + VERIFY(selected_dr == NULL && installed_dr == NULL); + selected_dr = dr; + if (dr->stateflags & NDDRF_INSTALLED) + installed_dr = dr; + NDDR_ADDREF_LOCKED(selected_dr); + NDDR_UNLOCK(dr); + goto install_route; + } + + if (dr->stateflags & NDDRF_MAPPED) + rtaddr = dr->rtaddr_mapped; + else + rtaddr = dr->rtaddr; + + NDDR_ADDREF_LOCKED(dr); /* for this for loop */ + NDDR_UNLOCK(dr); + + /* Callee returns a locked route upon success */ + if (selected_dr == NULL) { + lck_mtx_unlock(nd6_mutex); + if ((rt = nd6_lookup(&rtaddr, 0, drifp, 0)) != NULL && + (ln = rt->rt_llinfo) != NULL && + ND6_IS_LLINFO_PROBREACH(ln)) { + RT_LOCK_ASSERT_HELD(rt); + selected_dr = dr; + NDDR_ADDREF(selected_dr); + } + lck_mtx_lock(nd6_mutex); + } + + if (rt) { + RT_REMREF_LOCKED(rt); + RT_UNLOCK(rt); + rt = NULL; + } + + /* + * Handle case (b) + * When there are more than one routers on the same link, the one with + * the highest router preference will be installed. + * Since the list is in decreasing order of preference: + * 1) If selected_dr is not NULL, only use dr if it is static and has + * equal preference and selected_dr is not static. + * 2) Else if selected_dr is NULL, and dr is static make selected_dr = dr + */ + NDDR_LOCK(dr); + if (((selected_dr && (rtpref(dr) >= rtpref(selected_dr)) && + !(selected_dr->stateflags & NDDRF_STATIC)) || + (selected_dr == NULL)) && + (dr->stateflags & NDDRF_STATIC)) { + if (selected_dr) { + /* Release it later on */ + VERIFY(drrele == NULL); + drrele = selected_dr; + } + selected_dr = dr; + NDDR_ADDREF_LOCKED(selected_dr); + } + + /* Record the currently installed router */ + if (dr->stateflags & NDDRF_INSTALLED) { + if (installed_dr == NULL) { + installed_dr = dr; + NDDR_ADDREF_LOCKED(installed_dr); + if (dr->stateflags & NDDRF_MAPPED) + rtaddr = installed_dr->rtaddr_mapped; + else + rtaddr = installed_dr->rtaddr; + NDDR_UNLOCK(dr); + lck_mtx_unlock(nd6_mutex); + /* Callee returns a locked route upon success */ + if ((rt = nd6_lookup(&rtaddr, 0, ifp, 0)) != NULL) { + RT_LOCK_ASSERT_HELD(rt); + if ((ln = rt->rt_llinfo) != NULL && + ND6_IS_LLINFO_PROBREACH(ln)) + is_installed_reachable = TRUE; + + RT_REMREF_LOCKED(rt); + RT_UNLOCK(rt); + rt = NULL; + } + lck_mtx_lock(nd6_mutex); + } else { + /* this should not happen; warn for diagnosis */ + nd6log((LOG_ERR, "defrouter_select: more than one " + "default router is installed for interface :%s.\n", + if_name(ifp))); + NDDR_UNLOCK(dr); + } + } else + NDDR_UNLOCK(dr); + + NDDR_REMREF(dr); /* for this for loop */ + if (drrele != NULL) + NDDR_REMREF(drrele); + + /* + * Check if the list changed when we gave up + * the nd6_mutex lock + */ + if(genid != nd6_defrouter_genid) { + if (selected_dr) { + NDDR_REMREF(selected_dr); + selected_dr = NULL; + } + + if (installed_dr) { + NDDR_REMREF(installed_dr); + installed_dr = NULL; + } + + if (ndi->ndefrouters == 0) { + nd6log2((LOG_INFO, + "%s:%d: Interface %s no longer " + "has any default routers. Abort.\n", + __func__, __LINE__, if_name(ifp))); + goto out; + } + nd6log2((LOG_INFO, + "%s:%d: Iterate default router list again " + "for interface %s, as the list seems to have " + "changed during release-reaquire of global " + "nd6_mutex lock.\n", + __func__, __LINE__, if_name(ifp))); + + is_installed_reachable = FALSE; + genid = nd6_defrouter_genid; + dr = TAILQ_FIRST(&nd_defrouter); + } else { + dr = TAILQ_NEXT(dr, dr_entry); + } + } + + /* + * If none of the default routers was found to be reachable, + * round-robin the list regardless of preference. + * Please note selected_dr equal to NULL implies that even + * installed default router is not reachable + */ + if (selected_dr == NULL) { + if (installed_dr) { + for (dr = TAILQ_NEXT(installed_dr, dr_entry); dr; + dr = TAILQ_NEXT(dr, dr_entry)) { + if (installed_dr->ifp != dr->ifp) + continue; + selected_dr = dr; + break; + } + } + /* - * The Default Router List is empty, so install the default - * route to an inteface. - * XXX: The specification does not say this mechanism should - * be restricted to hosts, but this would be not useful - * (even harmful) for routers. + * If none was installed or the installed one if the last + * one on the list, select the first one from the list */ - if (!ip6_forwarding) { + if ((installed_dr == NULL) || (selected_dr == NULL)) { + for (dr = TAILQ_FIRST(&nd_defrouter); dr; + dr = TAILQ_NEXT(dr, dr_entry)) { + if (dr->ifp == ifp) { + selected_dr = dr; + break; + } + } + } + + if ((selected_dr == NULL) && (installed_dr == NULL)) { + nd6log2((LOG_INFO, + "%s:%d: Between release and reaquire of global " + "nd6_mutex lock, the list seems to have changed " + "and it does not have any default routers for " + "interface %s.\n", + __func__, __LINE__, if_name(ifp))); + goto out; + } + + if (selected_dr != installed_dr) + NDDR_ADDREF(selected_dr); + } else if (installed_dr != NULL) { + if (installed_dr != selected_dr) { /* - * De-install the current default route - * in advance. + * This means that selected default router is reachable + * while installed one may or may not be. + * Static router should always be considered as reachable + * for router selection process. */ - bzero(&anydr, sizeof(anydr)); - defrouter_delreq(&anydr, 0); - if (nd6_defifp) { - /* - * Install a route to the default interface - * as default route. - * XXX: we enable this for host only, because - * this may override a default route installed - * a user process (e.g. routing daemon) in a - * router case. - */ - defrouter_addifreq(nd6_defifp); - } else { - nd6log((LOG_INFO, "defrouter_select: " - "there's no default router and no default" - " interface\n")); + if ((installed_dr->stateflags & NDDRF_STATIC) && + rtpref(installed_dr) >= rtpref(selected_dr)) { + NDDR_REMREF(selected_dr); + selected_dr = installed_dr; + } else if (is_installed_reachable) { + if (rtpref(selected_dr) <= rtpref(installed_dr)) { + NDDR_REMREF(selected_dr); + selected_dr = installed_dr; + } } + } else { + NDDR_REMREF(selected_dr); } } - return; +install_route: + /* + * If the selected router is different than the installed one, + * remove the installed router and install the selected one. + * Note that the selected router is never NULL here. + * Else check if the route entry scope has to be changed. + */ + lck_mtx_unlock(nd6_mutex); + if (installed_dr != selected_dr) { + nd6log((LOG_INFO, + "%s:%d: Found a better router for interface " + "%s. Installing new default route.\n", + __func__, __LINE__, if_name(ifp))); + if (installed_dr != NULL) { + defrouter_delreq(installed_dr); + } + /* + * Install scoped route if the interface is not + * the default nd6 interface. + */ + defrouter_addreq(selected_dr, + (selected_dr->ifp != nd6_defifp)); + } else if (((installed_dr->stateflags & NDDRF_IFSCOPE) && + (installed_dr->ifp == nd6_defifp)) || + (!(installed_dr->stateflags & NDDRF_IFSCOPE) && + (installed_dr->ifp != nd6_defifp))) { + nd6log((LOG_INFO, + "%s:%d: Need to reinstall default route for interface " + "%s as its scope has changed.\n", + __func__, __LINE__, if_name(ifp))); + defrouter_delreq(installed_dr); + defrouter_addreq(installed_dr, + (installed_dr->ifp != nd6_defifp)); + } else { + nd6log2((LOG_INFO, + "%s:%d: No need to change the default " + "route for interface %s.\n", + __func__, __LINE__, if_name(ifp))); + } + lck_mtx_lock(nd6_mutex); +out: + if (selected_dr && (selected_dr != installed_dr)) + NDDR_REMREF(selected_dr); + if (installed_dr) + NDDR_REMREF(installed_dr); + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + VERIFY(nd_defrouter_busy); + nd_defrouter_busy = FALSE; + if (nd_defrouter_waiters > 0) { + nd_defrouter_waiters = 0; + wakeup(nd_defrouter_waitchan); + } } static struct nd_defrouter * -defrtrlist_update( - struct nd_defrouter *new) +defrtrlist_update_common(struct nd_defrouter *new, boolean_t scoped) { struct nd_defrouter *dr, *n; + struct ifnet *ifp = new->ifp; + struct nd_ifinfo *ndi = NULL; + struct timeval caltime; - lck_mtx_lock(nd6_mutex); - if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + + if ((dr = defrouter_lookup(&new->rtaddr, ifp)) != NULL) { /* entry exists */ if (new->rtlifetime == 0) { - defrtrlist_del(dr, 1); + TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); + defrtrlist_del(dr); + NDDR_REMREF(dr); /* remove list reference */ + NDDR_REMREF(dr); dr = NULL; } else { + int oldpref = rtpref(dr); + struct nd_defrouter *p = NULL; /* override */ dr->flags = new->flags; /* xxx flag check */ dr->rtlifetime = new->rtlifetime; dr->expire = new->expire; + + /* + * If the preference does not change, there's no need + * to sort the entries. If Scoped Routing is enabled, + * put the primary/non-scoped router at the top of the + * list of routers in the same preference band, unless + * it's already at that position. + */ + /* same preference and scoped; just return */ + if (rtpref(new) == oldpref && scoped) + return (dr); + + n = TAILQ_FIRST(&nd_defrouter); + while (n != NULL) { + /* preference changed; sort it */ + if (rtpref(new) != oldpref) + break; + + /* not at the top of band; sort it */ + if (n != dr && rtpref(n) == oldpref && + (!p || rtpref(p) > rtpref(n))) + break; + + p = n; + n = TAILQ_NEXT(n, dr_entry); + } + + /* nothing has changed, just return */ + if (n == NULL && (scoped || + !(dr->stateflags & NDDRF_IFSCOPE))) + return (dr); + + /* + * preferred router may be changed, so relocate + * this router. + * XXX: calling TAILQ_REMOVE directly is a bad manner. + * However, since defrtrlist_del() has many side + * effects, we intentionally do so here. + * defrouter_select() below will handle routing + * changes later. + */ + TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); + new->stateflags = dr->stateflags; + + n = dr; + goto insert; } - lck_mtx_unlock(nd6_mutex); - return(dr); + return (dr); } + VERIFY(dr == NULL); + /* entry does not exist */ if (new->rtlifetime == 0) { - lck_mtx_unlock(nd6_mutex); - return(NULL); + return (NULL); } - n = (struct nd_defrouter *)_MALLOC(sizeof(*n), M_IP6NDP, M_NOWAIT); + n = nddr_alloc(M_WAITOK); if (n == NULL) { - lck_mtx_unlock(nd6_mutex); - return(NULL); - } - bzero(n, sizeof(*n)); - *n = *new; + return (NULL); + } + + ndi = ND_IFINFO(ifp); + VERIFY((NULL != ndi) && (TRUE == ndi->initialized)); + lck_mtx_lock(&ndi->lock); + if (ip6_maxifdefrouters >= 0 && + ndi->ndefrouters >= ip6_maxifdefrouters) { + lck_mtx_unlock(&ndi->lock); + nddr_free(n); + return (NULL); + } + + NDDR_ADDREF(n); /* for the nd_defrouter list */ + NDDR_ADDREF(n); /* for the caller */ + + ++nd6_defrouter_genid; + ndi->ndefrouters++; + VERIFY(ndi->ndefrouters != 0); + lck_mtx_unlock(&ndi->lock); + + nd6log2((LOG_INFO, "%s: allocating defrouter %s\n", if_name(ifp), + ip6_sprintf(&new->rtaddr))); + + getmicrotime(&caltime); + NDDR_LOCK(n); + memcpy(&n->rtaddr, &new->rtaddr, sizeof (n->rtaddr)); + n->flags = new->flags; + n->stateflags = new->stateflags; + n->rtlifetime = new->rtlifetime; + n->expire = new->expire; + n->base_calendartime = caltime.tv_sec; + n->base_uptime = net_uptime(); + n->ifp = new->ifp; + n->err = new->err; + NDDR_UNLOCK(n); +insert: + /* get nd6_service() to be scheduled as soon as it's convenient */ + ++nd6_sched_timeout_want; /* - * Insert the new router at the end of the Default Router List. - * If there is no other router, install it anyway. Otherwise, - * just continue to use the current default router. + * Insert the new router in the Default Router List; + * The Default Router List should be in the descending order + * of router-preferece. When Scoped Routing is disabled, routers + * with the same preference are sorted in the arriving time order; + * otherwise, the first entry in the list of routers having the same + * preference is the primary default router, when the interface used + * by the entry is the default interface. */ - TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); - if (TAILQ_FIRST(&nd_defrouter) == n) - defrouter_select(); - - lck_mtx_unlock(nd6_mutex); - return(n); + + /* insert at the end of the group */ + for (dr = TAILQ_FIRST(&nd_defrouter); dr; + dr = TAILQ_NEXT(dr, dr_entry)) { + if (rtpref(n) > rtpref(dr) || + (!scoped && rtpref(n) == rtpref(dr))) + break; + } + if (dr) + TAILQ_INSERT_BEFORE(dr, n, dr_entry); + else + TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); + + defrouter_select(ifp); + + return (n); +} + +static struct nd_defrouter * +defrtrlist_update(struct nd_defrouter *new) +{ + struct nd_defrouter *dr; + + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + dr = defrtrlist_update_common(new, + (nd6_defifp != NULL && new->ifp != nd6_defifp)); + + return (dr); } static struct nd_pfxrouter * -pfxrtr_lookup( - struct nd_prefix *pr, - struct nd_defrouter *dr) +pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr) { struct nd_pfxrouter *search; - + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); - for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { + NDPR_LOCK_ASSERT_HELD(pr); + + for (search = pr->ndpr_advrtrs.lh_first; search; + search = search->pfr_next) { if (search->router == dr) break; } - return(search); + return (search); } static void -pfxrtr_add( - struct nd_prefix *pr, - struct nd_defrouter *dr) +pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr) { struct nd_pfxrouter *new; lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + NDPR_LOCK_ASSERT_NOTHELD(pr); - new = (struct nd_pfxrouter *)_MALLOC(sizeof(*new), M_IP6NDP, M_NOWAIT); + new = zalloc(ndprtr_zone); if (new == NULL) return; - bzero(new, sizeof(*new)); + bzero(new, sizeof (*new)); new->router = dr; + NDPR_LOCK(pr); LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); + pr->ndpr_genid++; + NDPR_UNLOCK(pr); - pfxlist_onlink_check(1); + pfxlist_onlink_check(); } static void -pfxrtr_del( - struct nd_pfxrouter *pfr) +pfxrtr_del(struct nd_pfxrouter *pfr, struct nd_prefix *pr) { lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + NDPR_LOCK_ASSERT_HELD(pr); + pr->ndpr_genid++; LIST_REMOVE(pfr, pfr_entry); - FREE(pfr, M_IP6NDP); + zfree(ndprtr_zone, pfr); } +/* + * The routine has been modified to atomically refresh expiry + * time for nd6 prefix as the part of lookup. + * There's a corner case where a system going + * in sleep gets rid of manual addresses configured in the system + * and then schedules the prefix for deletion. + * However before the prefix gets deleted, if system comes out + * from sleep and configures same address before prefix deletion + * , the later prefix deletion will remove the prefix route and + * the system will not be able to communicate with other IPv6 + * neighbor nodes in the same subnet. + */ struct nd_prefix * -nd6_prefix_lookup( - struct nd_prefix *pr) +nd6_prefix_lookup(struct nd_prefix *pr, int nd6_prefix_expiry) { struct nd_prefix *search; lck_mtx_lock(nd6_mutex); for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { + NDPR_LOCK(search); if (pr->ndpr_ifp == search->ndpr_ifp && pr->ndpr_plen == search->ndpr_plen && in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, - &search->ndpr_prefix.sin6_addr, - pr->ndpr_plen) - ) { + &search->ndpr_prefix.sin6_addr, pr->ndpr_plen)) { + if (nd6_prefix_expiry != ND6_PREFIX_EXPIRY_UNSPEC) { + search->ndpr_expire = nd6_prefix_expiry; + } + NDPR_ADDREF_LOCKED(search); + NDPR_UNLOCK(search); break; } + NDPR_UNLOCK(search); } - if (search != NULL) - ndpr_hold(search, TRUE); lck_mtx_unlock(nd6_mutex); - return(search); -} - -void -ndpr_hold(struct nd_prefix *pr, boolean_t locked) -{ - if (!locked) - lck_mtx_lock(nd6_mutex); - - if (pr->ndpr_usecnt < 0) - panic("%s: bad usecnt %d for pr %p\n", __func__, - pr->ndpr_usecnt, pr); - - pr->ndpr_usecnt++; - - if (!locked) - lck_mtx_unlock(nd6_mutex); -} - -void -ndpr_rele(struct nd_prefix *pr, boolean_t locked) -{ - if (!locked) - lck_mtx_lock(nd6_mutex); - - if (pr->ndpr_usecnt <= 0) - panic("%s: bad usecnt %d for pr %p\n", __func__, - pr->ndpr_usecnt, pr); - - pr->ndpr_usecnt--; - - if (!locked) - lck_mtx_unlock(nd6_mutex); + return (search); } int -nd6_prelist_add( - struct nd_prefix *pr, - struct nd_defrouter *dr, - struct nd_prefix **newp) +nd6_prelist_add(struct nd_prefix *pr, struct nd_defrouter *dr, + struct nd_prefix **newp, boolean_t force_scoped) { struct nd_prefix *new = NULL; - int i; + struct ifnet *ifp = pr->ndpr_ifp; + struct nd_ifinfo *ndi = NULL; + int i, error; - new = (struct nd_prefix *)_MALLOC(sizeof(*new), M_IP6NDP, M_NOWAIT); + if (ip6_maxifprefixes >= 0) { + ndi = ND_IFINFO(ifp); + VERIFY((NULL != ndi) && (TRUE == ndi->initialized)); + lck_mtx_lock(&ndi->lock); + if (ndi->nprefixes >= ip6_maxifprefixes) { + lck_mtx_unlock(&ndi->lock); + return (ENOMEM); + } + lck_mtx_unlock(&ndi->lock); + } + + new = ndpr_alloc(M_WAITOK); if (new == NULL) - return ENOMEM; - bzero(new, sizeof(*new)); - *new = *pr; - if (newp != NULL) + return (ENOMEM); + + NDPR_LOCK(new); + NDPR_LOCK(pr); + new->ndpr_ifp = pr->ndpr_ifp; + new->ndpr_prefix = pr->ndpr_prefix; + new->ndpr_plen = pr->ndpr_plen; + new->ndpr_vltime = pr->ndpr_vltime; + new->ndpr_pltime = pr->ndpr_pltime; + new->ndpr_flags = pr->ndpr_flags; + if (pr->ndpr_stateflags & NDPRF_STATIC) + new->ndpr_stateflags |= NDPRF_STATIC; + NDPR_UNLOCK(pr); + if ((error = in6_init_prefix_ltimes(new)) != 0) { + NDPR_UNLOCK(new); + ndpr_free(new); + return (error); + } + new->ndpr_lastupdate = net_uptime(); + if (newp != NULL) { *newp = new; - - /* initilization */ + NDPR_ADDREF_LOCKED(new); /* for caller */ + } + /* initialization */ LIST_INIT(&new->ndpr_advrtrs); in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); /* make prefix in the canonical form */ @@ -930,22 +1949,33 @@ nd6_prelist_add( new->ndpr_prefix.sin6_addr.s6_addr32[i] &= new->ndpr_mask.s6_addr32[i]; - /* link ndpr_entry to nd_prefix list */ + NDPR_UNLOCK(new); + + /* get nd6_service() to be scheduled as soon as it's convenient */ + ++nd6_sched_timeout_want; + lck_mtx_lock(nd6_mutex); + /* link ndpr_entry to nd_prefix list */ LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); + new->ndpr_debug |= IFD_ATTACHED; + NDPR_ADDREF(new); /* for nd_prefix list */ - new->ndpr_usecnt = 0; - ndpr_hold(new, TRUE); + lck_mtx_lock(&ndi->lock); + ndi->nprefixes++; + VERIFY(ndi->nprefixes != 0); + lck_mtx_unlock(&ndi->lock); /* ND_OPT_PI_FLAG_ONLINK processing */ if (new->ndpr_raf_onlink) { int e; - if ((e = nd6_prefix_onlink(new, 0, 1)) != 0) { + if ((e = nd6_prefix_onlink_common(new, force_scoped, + new->ndpr_ifp->if_index)) != 0) { nd6log((LOG_ERR, "nd6_prelist_add: failed to make " - "the prefix %s/%d on-link on %s (errno=%d)\n", - ip6_sprintf(&pr->ndpr_prefix.sin6_addr), - pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); + "the prefix %s/%d on-link %s on %s (errno=%d)\n", + ip6_sprintf(&new->ndpr_prefix.sin6_addr), + new->ndpr_plen, force_scoped ? "scoped" : + "non-scoped", if_name(ifp), e)); /* proceed anyway. XXX: is it correct? */ } } @@ -953,67 +1983,109 @@ nd6_prelist_add( if (dr) { pfxrtr_add(new, dr); } + lck_mtx_unlock(nd6_mutex); - return 0; + return (0); } +/* + * Caller must have held an extra reference on nd_prefix. + */ void -prelist_remove( - struct nd_prefix *pr, int nd6locked) +prelist_remove(struct nd_prefix *pr) { struct nd_pfxrouter *pfr, *next; + struct ifnet *ifp = pr->ndpr_ifp; int e; + struct nd_ifinfo *ndi = NULL; + + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + NDPR_LOCK_ASSERT_HELD(pr); + + if (pr->ndpr_stateflags & NDPRF_DEFUNCT) + return; + + /* + * If there are no more addresses, defunct the prefix. This is needed + * because we don't want multiple threads calling prelist_remove() for + * the same prefix and this might happen because we unlock nd6_mutex + * down below. + */ + if (pr->ndpr_addrcnt == 0) + pr->ndpr_stateflags |= NDPRF_DEFUNCT; /* make sure to invalidate the prefix until it is really freed. */ pr->ndpr_vltime = 0; pr->ndpr_pltime = 0; -#if 0 + /* * Though these flags are now meaningless, we'd rather keep the value - * not to confuse users when executing "ndp -p". + * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users + * when executing "ndp -p". */ - pr->ndpr_raf_onlink = 0; - pr->ndpr_raf_auto = 0; -#endif - if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 && - (e = nd6_prefix_offlink(pr)) != 0) { - nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " - "on %s, errno=%d\n", - ip6_sprintf(&pr->ndpr_prefix.sin6_addr), - pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); - /* what should we do? */ - } - - if (nd6locked == 0) + if (pr->ndpr_stateflags & NDPRF_ONLINK) { + NDPR_ADDREF_LOCKED(pr); + NDPR_UNLOCK(pr); + lck_mtx_unlock(nd6_mutex); + if ((e = nd6_prefix_offlink(pr)) != 0) { + nd6log((LOG_ERR, "prelist_remove: failed to make " + "%s/%d offlink on %s, errno=%d\n", + ip6_sprintf(&pr->ndpr_prefix.sin6_addr), + pr->ndpr_plen, if_name(ifp), e)); + /* what should we do? */ + } lck_mtx_lock(nd6_mutex); + NDPR_LOCK(pr); + if (NDPR_REMREF_LOCKED(pr) == NULL) + return; + } - if (pr->ndpr_usecnt > 0 || pr->ndpr_refcnt > 0) - goto done; /* notice here? */ + if (pr->ndpr_addrcnt > 0) { + /* + * The state might have changed if we called + * nd6_prefix_offlink(). + */ + pr->ndpr_stateflags &= ~NDPRF_DEFUNCT; + return; /* notice here? */ + } /* unlink ndpr_entry from nd_prefix list */ LIST_REMOVE(pr, ndpr_entry); + pr->ndpr_debug &= ~IFD_ATTACHED; /* free list of routers that adversed the prefix */ for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { next = pfr->pfr_next; - - FREE(pfr, M_IP6NDP); + pfxrtr_del(pfr, pr); } - FREE(pr, M_IP6NDP); + ndi = ND_IFINFO(ifp); + VERIFY((NULL != ndi) && (TRUE == ndi->initialized)); + lck_mtx_lock(&ndi->lock); + VERIFY(ndi->nprefixes > 0); + ndi->nprefixes--; + lck_mtx_unlock(&ndi->lock); - pfxlist_onlink_check(1); -done: - if (nd6locked == 0) - lck_mtx_unlock(nd6_mutex); + /* This must not be the last reference to the nd_prefix */ + if (NDPR_REMREF_LOCKED(pr) == NULL) { + panic("%s: unexpected (missing) refcnt ndpr=%p", __func__, pr); + /* NOTREACHED */ + } + + /* + * Don't call pfxlist_onlink_check() here because we are + * holding the NDPR lock and this could cause a deadlock when + * there are multiple threads executing pfxlist_onlink_check(). + */ } int prelist_update( struct nd_prefix *new, struct nd_defrouter *dr, /* may be NULL */ - struct mbuf *m) + struct mbuf *m, + int mcast) { struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; struct ifaddr *ifa; @@ -1023,7 +2095,10 @@ prelist_update( int newprefix = 0; int auth; struct in6_addrlifetime lt6_tmp; - struct timeval timenow; + uint64_t timenow = net_uptime(); + + /* no need to lock "new" here, as it is local to the caller */ + NDPR_LOCK_ASSERT_NOTHELD(new); auth = 0; if (m) { @@ -1032,13 +2107,11 @@ prelist_update( * both IP header and IP datagrams, doesn't it ? */ #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) - auth = (m->m_flags & M_AUTHIPHDR - && m->m_flags & M_AUTHIPDGM) ? 1 : 0; + auth = (m->m_flags & M_AUTHIPHDR) && (m->m_flags & M_AUTHIPDGM); #endif } - - if ((pr = nd6_prefix_lookup(new)) != NULL) { + if ((pr = nd6_prefix_lookup(new, ND6_PREFIX_EXPIRY_UNSPEC)) != NULL) { /* * nd6_prefix_lookup() ensures that pr and new have the same * prefix on a same interface. @@ -1049,6 +2122,8 @@ prelist_update( * and the autonomous (A) bit should NOT be changed from 1 * to 0. */ + lck_mtx_lock(nd6_mutex); + NDPR_LOCK(pr); if (new->ndpr_raf_onlink == 1) pr->ndpr_raf_onlink = 1; if (new->ndpr_raf_auto == 1) @@ -1056,15 +2131,17 @@ prelist_update( if (new->ndpr_raf_onlink) { pr->ndpr_vltime = new->ndpr_vltime; pr->ndpr_pltime = new->ndpr_pltime; - pr->ndpr_preferred = new->ndpr_preferred; - pr->ndpr_expire = new->ndpr_expire; + (void) in6_init_prefix_ltimes(pr); /* XXX error case? */ + pr->ndpr_lastupdate = net_uptime(); } + NDPR_ADDREF_LOCKED(pr); if (new->ndpr_raf_onlink && (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { int e; - if ((e = nd6_prefix_onlink(pr, 0, 0)) != 0) { + NDPR_UNLOCK(pr); + if ((e = nd6_prefix_onlink(pr)) != 0) { nd6log((LOG_ERR, "prelist_update: failed to make " "the prefix %s/%d on-link on %s " @@ -1073,15 +2150,18 @@ prelist_update( pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); /* proceed anyway. XXX: is it correct? */ } + NDPR_LOCK(pr); } - - lck_mtx_lock(nd6_mutex); - if (dr && pfxrtr_lookup(pr, dr) == NULL) + + if (dr && pfxrtr_lookup(pr, dr) == NULL) { + NDPR_UNLOCK(pr); pfxrtr_add(pr, dr); + } else { + NDPR_UNLOCK(pr); + } + NDPR_REMREF(pr); lck_mtx_unlock(nd6_mutex); } else { - struct nd_prefix *newpr = NULL; - newprefix = 1; if (new->ndpr_vltime == 0) @@ -1089,94 +2169,89 @@ prelist_update( if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) goto end; - bzero(&new->ndpr_addr, sizeof(struct in6_addr)); + bzero(&new->ndpr_addr, sizeof (struct in6_addr)); - error = nd6_prelist_add(new, dr, &newpr); - if (error != 0 || newpr == NULL) { + error = nd6_prelist_add(new, dr, &pr, FALSE); + if (error != 0 || pr == NULL) { nd6log((LOG_NOTICE, "prelist_update: " "nd6_prelist_add failed for %s/%d on %s " - "errno=%d, returnpr=%p\n", + "errno=%d, returnpr=0x%llx\n", ip6_sprintf(&new->ndpr_prefix.sin6_addr), - new->ndpr_plen, if_name(new->ndpr_ifp), - error, newpr)); + new->ndpr_plen, if_name(new->ndpr_ifp), + error, (uint64_t)VM_KERNEL_ADDRPERM(pr))); goto end; /* we should just give up in this case. */ } - - /* - * XXX: from the ND point of view, we can ignore a prefix - * with the on-link bit being zero. However, we need a - * prefix structure for references from autoconfigured - * addresses. Thus, we explicitly make suret that the prefix - * itself expires now. - */ - if (newpr->ndpr_raf_onlink == 0) { - newpr->ndpr_vltime = 0; - newpr->ndpr_pltime = 0; - in6_init_prefix_ltimes(newpr); - } - - pr = newpr; } /* - * Address autoconfiguration based on Section 5.5.3 of RFC 2462. + * Address autoconfiguration based on Section 5.5.3 of RFC 4862. * Note that pr must be non NULL at this point. */ /* 5.5.3 (a). Ignore the prefix without the A bit set. */ if (!new->ndpr_raf_auto) - goto afteraddrconf; + goto end; /* * 5.5.3 (b). the link-local prefix should have been ignored in * nd6_ra_input. */ - /* - * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. - * This should have been done in nd6_ra_input. - */ + /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */ + if (new->ndpr_pltime > new->ndpr_vltime) { + error = EINVAL; /* XXX: won't be used */ + goto end; + } - /* - * 5.5.3 (d). If the prefix advertised does not match the prefix of an - * address already in the list, and the Valid Lifetime is not 0, - * form an address. Note that even a manually configured address - * should reject autoconfiguration of a new address. + /* + * 5.5.3 (d). If the prefix advertised is not equal to the prefix of + * an address configured by stateless autoconfiguration already in the + * list of addresses associated with the interface, and the Valid + * Lifetime is not 0, form an address. We first check if we have + * a matching prefix. */ - getmicrotime(&timenow); - - ifnet_lock_exclusive(ifp); - TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) - { + ifnet_lock_shared(ifp); + TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { struct in6_ifaddr *ifa6; - int ifa_plen; - u_int32_t storedlifetime; + u_int32_t remaininglifetime; - if (ifa->ifa_addr->sa_family != AF_INET6) + IFA_LOCK(ifa); + if (ifa->ifa_addr->sa_family != AF_INET6) { + IFA_UNLOCK(ifa); continue; - + } ifa6 = (struct in6_ifaddr *)ifa; + /* + * We only consider autoconfigured addresses as per RFC 4862. + */ + if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF)) { + IFA_UNLOCK(ifa); + continue; + } /* * Spec is not clear here, but I believe we should concentrate * on unicast (i.e. not anycast) addresses. * XXX: other ia6_flags? detached or duplicated? */ - if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) + if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) { + IFA_UNLOCK(ifa); continue; - - ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL); - if (ifa_plen != new->ndpr_plen || - !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr, - &new->ndpr_prefix.sin6_addr, - ifa_plen)) + } + /* + * Ignore the address if it is not associated with a prefix + * or is associated with a prefix that is different from this + * one. (pr is never NULL here) + */ + if (ifa6->ia6_ndpr != pr) { + IFA_UNLOCK(ifa); continue; + } - if (ia6_match == NULL) /* remember the first one */ + if (ia6_match == NULL) { /* remember the first one */ ia6_match = ifa6; - - if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0) - continue; + IFA_ADDREF_LOCKED(ifa); /* for ia6_match */ + } /* * An already autoconfigured address matched. Now that we @@ -1184,32 +2259,37 @@ prelist_update( * proceed to 5.5.3. (e): update the lifetimes according to the * "two hours" rule and the privacy extension. */ -#define TWOHOUR (120*60) - lt6_tmp = ifa6->ia6_lifetime; +#define TWOHOUR (120*60) - storedlifetime = IFA6_IS_INVALID(ifa6) ? 0 : - (lt6_tmp.ia6t_expire - timenow.tv_sec); + /* retrieve time as uptime (last arg is 0) */ + in6ifa_getlifetime(ifa6, <6_tmp, 0); + + if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) + remaininglifetime = ND6_INFINITE_LIFETIME; + else if (timenow - ifa6->ia6_updatetime > lt6_tmp.ia6t_vltime) { + /* + * The case of "invalid" address. We should usually + * not see this case. + */ + remaininglifetime = 0; + } else { + remaininglifetime = lt6_tmp.ia6t_vltime - + (timenow - ifa6->ia6_updatetime); + } + /* when not updating, keep the current stored lifetime. */ + lt6_tmp.ia6t_vltime = remaininglifetime; if (TWOHOUR < new->ndpr_vltime || - storedlifetime < new->ndpr_vltime) { + remaininglifetime < new->ndpr_vltime) { lt6_tmp.ia6t_vltime = new->ndpr_vltime; - } else if (storedlifetime <= TWOHOUR -#if 0 - /* - * This condition is logically redundant, so we just - * omit it. - * See IPng 6712, 6717, and 6721. - */ - && new->ndpr_vltime <= storedlifetime -#endif - ) { + } else if (remaininglifetime <= TWOHOUR) { if (auth) { lt6_tmp.ia6t_vltime = new->ndpr_vltime; } } else { /* * new->ndpr_vltime <= TWOHOUR && - * TWOHOUR < storedlifetime + * TWOHOUR < remaininglifetime */ lt6_tmp.ia6t_vltime = TWOHOUR; } @@ -1217,57 +2297,83 @@ prelist_update( /* The 2 hour rule is not imposed for preferred lifetime. */ lt6_tmp.ia6t_pltime = new->ndpr_pltime; - in6_init_address_ltimes(pr, <6_tmp); - - /* - * When adjusting the lifetimes of an existing temporary - * address, only lower the lifetimes. - * RFC 3041 3.3. (1). - * XXX: how should we modify ia6t_[pv]ltime? - */ + /* Special handling for lifetimes of temporary addresses. */ if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { - if (lt6_tmp.ia6t_expire == 0 || /* no expire */ - lt6_tmp.ia6t_expire > - ifa6->ia6_lifetime.ia6t_expire) { - lt6_tmp.ia6t_expire = - ifa6->ia6_lifetime.ia6t_expire; - } - if (lt6_tmp.ia6t_preferred == 0 || /* no expire */ - lt6_tmp.ia6t_preferred > - ifa6->ia6_lifetime.ia6t_preferred) { - lt6_tmp.ia6t_preferred = - ifa6->ia6_lifetime.ia6t_preferred; - } + u_int32_t maxvltime, maxpltime; + + /* Constrain lifetimes to system limits. */ + if (lt6_tmp.ia6t_vltime > ip6_temp_valid_lifetime) + lt6_tmp.ia6t_vltime = ip6_temp_valid_lifetime; + if (lt6_tmp.ia6t_pltime > ip6_temp_preferred_lifetime) + lt6_tmp.ia6t_pltime = + ip6_temp_preferred_lifetime - + ip6_desync_factor; + + /* + * According to RFC 4941, section 3.3 (1), we only + * update the lifetimes when they are in the maximum + * intervals. + */ + if (ip6_temp_valid_lifetime > + (u_int32_t)((timenow - ifa6->ia6_createtime) + + ip6_desync_factor)) { + maxvltime = ip6_temp_valid_lifetime - + (timenow - ifa6->ia6_createtime) - + ip6_desync_factor; + } else + maxvltime = 0; + if (ip6_temp_preferred_lifetime > + (u_int32_t)((timenow - ifa6->ia6_createtime) + + ip6_desync_factor)) { + maxpltime = ip6_temp_preferred_lifetime - + (timenow - ifa6->ia6_createtime) - + ip6_desync_factor; + } else + maxpltime = 0; + + if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME || + lt6_tmp.ia6t_vltime > maxvltime) + lt6_tmp.ia6t_vltime = maxvltime; + + if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME || + lt6_tmp.ia6t_pltime > maxpltime) + lt6_tmp.ia6t_pltime = maxpltime; } - ifa6->ia6_lifetime = lt6_tmp; + in6_init_address_ltimes(pr, <6_tmp); + + in6ifa_setlifetime(ifa6, <6_tmp); + ifa6->ia6_updatetime = timenow; + IFA_UNLOCK(ifa); } ifnet_lock_done(ifp); if (ia6_match == NULL && new->ndpr_vltime) { /* + * 5.5.3 (d) (continued) * No address matched and the valid lifetime is non-zero. * Create a new address. */ - if ((ia6 = in6_ifadd(new, NULL)) != NULL) { + + if ((ia6 = in6_pfx_newpersistaddr(new, mcast, &error)) + != NULL) { /* * note that we should use pr (not new) for reference. */ - lck_mtx_lock(nd6_mutex); - pr->ndpr_refcnt++; - lck_mtx_unlock(nd6_mutex); + IFA_LOCK(&ia6->ia_ifa); + NDPR_LOCK(pr); ia6->ia6_ndpr = pr; - -#if 0 - /* XXXYYY Don't do this, according to Jinmei. */ - pr->ndpr_addr = new->ndpr_addr; -#endif + NDPR_ADDREF_LOCKED(pr); /* for addr reference */ + pr->ndpr_addrcnt++; + VERIFY(pr->ndpr_addrcnt != 0); + NDPR_UNLOCK(pr); + IFA_UNLOCK(&ia6->ia_ifa); /* - * RFC 3041 3.3 (2). + * RFC 4941 3.3 (2). * When a new public address is created as described - * in RFC2462, also create a new temporary address. + * in RFC 4862, also create a new temporary address. * - * RFC 3041 3.5. + * RFC 4941 3.5. * When an interface connects to a new link, a new * randomized interface identifier should be generated * immediately together with a new set of temporary @@ -1283,53 +2389,367 @@ prelist_update( e)); } } + IFA_REMREF(&ia6->ia_ifa); + ia6 = NULL; /* * A newly added address might affect the status * of other addresses, so we check and update it. * XXX: what if address duplication happens? */ - pfxlist_onlink_check(0); - } else { - /* just set an error. do not bark here. */ - error = EADDRNOTAVAIL; /* XXX: might be unused. */ + lck_mtx_lock(nd6_mutex); + pfxlist_onlink_check(); + lck_mtx_unlock(nd6_mutex); } } -afteraddrconf: - end: if (pr != NULL) - ndpr_rele(pr, FALSE); + NDPR_REMREF(pr); + if (ia6_match != NULL) + IFA_REMREF(&ia6_match->ia_ifa); + return (error); +} + +/* + * Neighbor Discover Default Router structure reference counting routines. + */ +static struct nd_defrouter * +nddr_alloc(int how) +{ + struct nd_defrouter *dr; + + dr = (how == M_WAITOK) ? zalloc(nddr_zone) : zalloc_noblock(nddr_zone); + if (dr != NULL) { + bzero(dr, nddr_size); + lck_mtx_init(&dr->nddr_lock, ifa_mtx_grp, ifa_mtx_attr); + dr->nddr_debug |= IFD_ALLOC; + if (nddr_debug != 0) { + dr->nddr_debug |= IFD_DEBUG; + dr->nddr_trace = nddr_trace; + } + } + return (dr); +} + +static void +nddr_free(struct nd_defrouter *dr) +{ + NDDR_LOCK(dr); + if (dr->nddr_debug & IFD_ATTACHED) { + panic("%s: attached nddr %p is being freed", __func__, dr); + /* NOTREACHED */ + } else if (!(dr->nddr_debug & IFD_ALLOC)) { + panic("%s: nddr %p cannot be freed", __func__, dr); + /* NOTREACHED */ + } + dr->nddr_debug &= ~IFD_ALLOC; + NDDR_UNLOCK(dr); + + lck_mtx_destroy(&dr->nddr_lock, ifa_mtx_grp); + zfree(nddr_zone, dr); +} + +static void +nddr_trace(struct nd_defrouter *dr, int refhold) +{ + struct nd_defrouter_dbg *dr_dbg = (struct nd_defrouter_dbg *)dr; + ctrace_t *tr; + uint32_t idx; + uint16_t *cnt; + + if (!(dr->nddr_debug & IFD_DEBUG)) { + panic("%s: nddr %p has no debug structure", __func__, dr); + /* NOTREACHED */ + } + if (refhold) { + cnt = &dr_dbg->nddr_refhold_cnt; + tr = dr_dbg->nddr_refhold; + } else { + cnt = &dr_dbg->nddr_refrele_cnt; + tr = dr_dbg->nddr_refrele; + } + + idx = atomic_add_16_ov(cnt, 1) % NDDR_TRACE_HIST_SIZE; + ctrace_record(&tr[idx]); +} + +void +nddr_addref(struct nd_defrouter *nddr, int locked) +{ + + if (!locked) + NDDR_LOCK_SPIN(nddr); + else + NDDR_LOCK_ASSERT_HELD(nddr); + + if (++nddr->nddr_refcount == 0) { + panic("%s: nddr %p wraparound refcnt\n", __func__, nddr); + /* NOTREACHED */ + } else if (nddr->nddr_trace != NULL) { + (*nddr->nddr_trace)(nddr, TRUE); + } + + if (!locked) + NDDR_UNLOCK(nddr); +} + +struct nd_defrouter * +nddr_remref(struct nd_defrouter *nddr, int locked) +{ + + if (!locked) + NDDR_LOCK_SPIN(nddr); + else + NDDR_LOCK_ASSERT_HELD(nddr); + + if (nddr->nddr_refcount == 0) { + panic("%s: nddr %p negative refcnt\n", __func__, nddr); + /* NOTREACHED */ + } else if (nddr->nddr_trace != NULL) { + (*nddr->nddr_trace)(nddr, FALSE); + } + + if (--nddr->nddr_refcount == 0) { + NDDR_UNLOCK(nddr); + nddr_free(nddr); + nddr = NULL; + } + + if (!locked && nddr != NULL) + NDDR_UNLOCK(nddr); + + return (nddr); +} + +uint64_t +nddr_getexpire(struct nd_defrouter *dr) +{ + struct timeval caltime; + uint64_t expiry; + + if (dr->expire != 0) { + /* account for system time change */ + getmicrotime(&caltime); - return error; + dr->base_calendartime += + NET_CALCULATE_CLOCKSKEW(caltime, + dr->base_calendartime, net_uptime(), dr->base_uptime); + + expiry = dr->base_calendartime + + dr->expire - dr->base_uptime; + } else { + expiry = 0; + } + return (expiry); +} + +/* + * Neighbor Discover Prefix structure reference counting routines. + */ +static struct nd_prefix * +ndpr_alloc(int how) +{ + struct nd_prefix *pr; + + pr = (how == M_WAITOK) ? zalloc(ndpr_zone) : zalloc_noblock(ndpr_zone); + if (pr != NULL) { + bzero(pr, ndpr_size); + lck_mtx_init(&pr->ndpr_lock, ifa_mtx_grp, ifa_mtx_attr); + RB_INIT(&pr->ndpr_prproxy_sols); + pr->ndpr_debug |= IFD_ALLOC; + if (ndpr_debug != 0) { + pr->ndpr_debug |= IFD_DEBUG; + pr->ndpr_trace = ndpr_trace; + } + } + return (pr); +} + +static void +ndpr_free(struct nd_prefix *pr) +{ + NDPR_LOCK(pr); + if (pr->ndpr_debug & IFD_ATTACHED) { + panic("%s: attached ndpr %p is being freed", __func__, pr); + /* NOTREACHED */ + } else if (!(pr->ndpr_debug & IFD_ALLOC)) { + panic("%s: ndpr %p cannot be freed", __func__, pr); + /* NOTREACHED */ + } else if (pr->ndpr_rt != NULL) { + panic("%s: ndpr %p route %p not freed", __func__, pr, + pr->ndpr_rt); + /* NOTREACHED */ + } else if (pr->ndpr_prproxy_sols_cnt != 0) { + panic("%s: ndpr %p non-zero solicitors count (%d)", + __func__, pr, pr->ndpr_prproxy_sols_cnt); + /* NOTREACHED */ + } else if (!RB_EMPTY(&pr->ndpr_prproxy_sols)) { + panic("%s: ndpr %p non-empty solicitors tree", __func__, pr); + /* NOTREACHED */ + } + pr->ndpr_debug &= ~IFD_ALLOC; + NDPR_UNLOCK(pr); + + lck_mtx_destroy(&pr->ndpr_lock, ifa_mtx_grp); + zfree(ndpr_zone, pr); +} + +static void +ndpr_trace(struct nd_prefix *pr, int refhold) +{ + struct nd_prefix_dbg *pr_dbg = (struct nd_prefix_dbg *)pr; + ctrace_t *tr; + u_int32_t idx; + u_int16_t *cnt; + + if (!(pr->ndpr_debug & IFD_DEBUG)) { + panic("%s: ndpr %p has no debug structure", __func__, pr); + /* NOTREACHED */ + } + if (refhold) { + cnt = &pr_dbg->ndpr_refhold_cnt; + tr = pr_dbg->ndpr_refhold; + } else { + cnt = &pr_dbg->ndpr_refrele_cnt; + tr = pr_dbg->ndpr_refrele; + } + + idx = atomic_add_16_ov(cnt, 1) % NDPR_TRACE_HIST_SIZE; + ctrace_record(&tr[idx]); +} + +void +ndpr_addref(struct nd_prefix *ndpr, int locked) +{ + if (!locked) + NDPR_LOCK_SPIN(ndpr); + else + NDPR_LOCK_ASSERT_HELD(ndpr); + + if (++ndpr->ndpr_refcount == 0) { + panic("%s: ndpr %p wraparound refcnt\n", __func__, ndpr); + /* NOTREACHED */ + } else if (ndpr->ndpr_trace != NULL) { + (*ndpr->ndpr_trace)(ndpr, TRUE); + } + + if (!locked) + NDPR_UNLOCK(ndpr); +} + +struct nd_prefix * +ndpr_remref(struct nd_prefix *ndpr, int locked) +{ + if (!locked) + NDPR_LOCK_SPIN(ndpr); + else + NDPR_LOCK_ASSERT_HELD(ndpr); + + if (ndpr->ndpr_refcount == 0) { + panic("%s: ndpr %p negative refcnt\n", __func__, ndpr); + /* NOTREACHED */ + } else if (ndpr->ndpr_trace != NULL) { + (*ndpr->ndpr_trace)(ndpr, FALSE); + } + + if (--ndpr->ndpr_refcount == 0) { + if (ndpr->ndpr_addrcnt != 0) { + panic("%s: freeing ndpr %p with outstanding address " + "reference (%d)", __func__, ndpr, + ndpr->ndpr_addrcnt); + /* NOTREACHED */ + } + NDPR_UNLOCK(ndpr); + ndpr_free(ndpr); + ndpr = NULL; + } + + if (!locked && ndpr != NULL) + NDPR_UNLOCK(ndpr); + + return (ndpr); +} + +uint64_t +ndpr_getexpire(struct nd_prefix *pr) +{ + struct timeval caltime; + uint64_t expiry; + + if (pr->ndpr_expire != 0 && pr->ndpr_vltime != ND6_INFINITE_LIFETIME) { + /* account for system time change */ + getmicrotime(&caltime); + + pr->ndpr_base_calendartime += + NET_CALCULATE_CLOCKSKEW(caltime, + pr->ndpr_base_calendartime, net_uptime(), + pr->ndpr_base_uptime); + + expiry = pr->ndpr_base_calendartime + + pr->ndpr_expire - pr->ndpr_base_uptime; + } else { + expiry = 0; + } + return (expiry); } /* * A supplement function used in the on-link detection below; * detect if a given prefix has a (probably) reachable advertising router. * XXX: lengthy function name... + * + * Callers *must* increase the reference count of nd_prefix. */ static struct nd_pfxrouter * -find_pfxlist_reachable_router( - struct nd_prefix *pr) +find_pfxlist_reachable_router(struct nd_prefix *pr) { struct nd_pfxrouter *pfxrtr; struct rtentry *rt; struct llinfo_nd6 *ln; + struct ifnet *ifp; + struct in6_addr rtaddr; + unsigned int genid; lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + NDPR_LOCK_ASSERT_HELD(pr); + + genid = pr->ndpr_genid; + pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); + while (pfxrtr) { + ifp = pfxrtr->router->ifp; + if (pfxrtr->router->stateflags & NDDRF_MAPPED) + rtaddr = pfxrtr->router->rtaddr_mapped; + else + rtaddr = pfxrtr->router->rtaddr; - for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr; - pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { - if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0, - pfxrtr->router->ifp, 0)) && - (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && - ND6_IS_LLINFO_PROBREACH(ln)) - break; /* found */ + NDPR_UNLOCK(pr); + lck_mtx_unlock(nd6_mutex); + /* Callee returns a locked route upon success */ + if ((rt = nd6_lookup(&rtaddr, 0, ifp, 0)) != NULL) { + RT_LOCK_ASSERT_HELD(rt); + if ((ln = rt->rt_llinfo) != NULL && + ND6_IS_LLINFO_PROBREACH(ln)) { + RT_REMREF_LOCKED(rt); + RT_UNLOCK(rt); + lck_mtx_lock(nd6_mutex); + NDPR_LOCK(pr); + break; /* found */ + } + RT_REMREF_LOCKED(rt); + RT_UNLOCK(rt); + } + lck_mtx_lock(nd6_mutex); + NDPR_LOCK(pr); + if (pr->ndpr_genid != genid) { + pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); + genid = pr->ndpr_genid; + } else + pfxrtr = LIST_NEXT(pfxrtr, pfr_entry); } + NDPR_LOCK_ASSERT_HELD(pr); - return(pfxrtr); + return (pfxrtr); } @@ -1347,62 +2767,148 @@ find_pfxlist_reachable_router( * is no router around us. */ void -pfxlist_onlink_check(int nd6locked) +pfxlist_onlink_check(void) { - struct nd_prefix *pr; + struct nd_prefix *pr, *prclear; struct in6_ifaddr *ifa; + struct nd_defrouter *dr; + struct nd_pfxrouter *pfxrtr = NULL; + int err, i, found = 0; + struct ifaddr **ifap = NULL; + struct nd_prefix *ndpr; + + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + + while (nd_prefix_busy) { + nd_prefix_waiters++; + msleep(nd_prefix_waitchan, nd6_mutex, (PZERO-1), + __func__, NULL); + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + } + nd_prefix_busy = TRUE; /* * Check if there is a prefix that has a reachable advertising * router. */ - if (nd6locked == 0) - lck_mtx_lock(nd6_mutex); - lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); - for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { - if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) + pr = nd_prefix.lh_first; + while (pr) { + NDPR_LOCK(pr); + if (pr->ndpr_stateflags & NDPRF_PROCESSED_ONLINK) { + NDPR_UNLOCK(pr); + pr = pr->ndpr_next; + continue; + } + NDPR_ADDREF_LOCKED(pr); + if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr) && + (pr->ndpr_debug & IFD_ATTACHED)) { + if (NDPR_REMREF_LOCKED(pr) == NULL) + pr = NULL; + else + NDPR_UNLOCK(pr); break; + } + pr->ndpr_stateflags |= NDPRF_PROCESSED_ONLINK; + NDPR_UNLOCK(pr); + NDPR_REMREF(pr); + /* + * Since find_pfxlist_reachable_router() drops the nd6_mutex, we + * have to start over, but the NDPRF_PROCESSED_ONLINK flag will + * stop us from checking the same prefix twice. + */ + pr = nd_prefix.lh_first; } - - if (pr) { + LIST_FOREACH(prclear, &nd_prefix, ndpr_entry) { + NDPR_LOCK(prclear); + prclear->ndpr_stateflags &= ~NDPRF_PROCESSED_ONLINK; + NDPR_UNLOCK(prclear); + } + /* + * If we have no such prefix, check whether we still have a router + * that does not advertise any prefixes. + */ + if (pr == NULL) { + for (dr = TAILQ_FIRST(&nd_defrouter); dr; + dr = TAILQ_NEXT(dr, dr_entry)) { + struct nd_prefix *pr0; + + for (pr0 = nd_prefix.lh_first; pr0; + pr0 = pr0->ndpr_next) { + NDPR_LOCK(pr0); + if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL) { + NDPR_UNLOCK(pr0); + break; + } + NDPR_UNLOCK(pr0); + } + if (pfxrtr != NULL) + break; + } + } + if (pr != NULL || (TAILQ_FIRST(&nd_defrouter) && pfxrtr == NULL)) { /* - * There is at least one prefix that has a reachable router. + * There is at least one prefix that has a reachable router, + * or at least a router which probably does not advertise + * any prefixes. The latter would be the case when we move + * to a new link where we have a router that does not provide + * prefixes and we configure an address by hand. * Detach prefixes which have no reachable advertising * router, and attach other prefixes. */ - for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { - /* XXX: a link-local prefix should never be detached */ - if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) - continue; - + pr = nd_prefix.lh_first; + while (pr) { + NDPR_LOCK(pr); /* - * we aren't interested in prefixes without the L bit - * set. + * We aren't interested prefixes already processed, + * nor in prefixes without the L bit + * set nor in static prefixes */ - if (pr->ndpr_raf_onlink == 0) + if (pr->ndpr_raf_onlink == 0 || + pr->ndpr_stateflags & NDPRF_PROCESSED_ONLINK || + pr->ndpr_stateflags & NDPRF_STATIC) { + NDPR_UNLOCK(pr); + pr = pr->ndpr_next; continue; - + } + NDPR_ADDREF_LOCKED(pr); if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && - find_pfxlist_reachable_router(pr) == NULL) + find_pfxlist_reachable_router(pr) == NULL && + (pr->ndpr_debug & IFD_ATTACHED)) pr->ndpr_stateflags |= NDPRF_DETACHED; if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && - find_pfxlist_reachable_router(pr) != 0) + find_pfxlist_reachable_router(pr) != NULL && + (pr->ndpr_debug & IFD_ATTACHED)) pr->ndpr_stateflags &= ~NDPRF_DETACHED; + pr->ndpr_stateflags |= NDPRF_PROCESSED_ONLINK; + NDPR_UNLOCK(pr); + NDPR_REMREF(pr); + /* + * Since find_pfxlist_reachable_router() drops the + * nd6_mutex, we have to start over, but the + * NDPRF_PROCESSED_ONLINK flag will stop us from + * checking the same prefix twice. + */ + pr = nd_prefix.lh_first; } } else { /* there is no prefix that has a reachable router */ for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { - if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) - continue; - - if (pr->ndpr_raf_onlink == 0) + NDPR_LOCK(pr); + if (pr->ndpr_raf_onlink == 0 || + pr->ndpr_stateflags & NDPRF_STATIC) { + NDPR_UNLOCK(pr); continue; - + } if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0) pr->ndpr_stateflags &= ~NDPRF_DETACHED; + NDPR_UNLOCK(pr); } } - + LIST_FOREACH(prclear, &nd_prefix, ndpr_entry) { + NDPR_LOCK(prclear); + prclear->ndpr_stateflags &= ~NDPRF_PROCESSED_ONLINK; + NDPR_UNLOCK(prclear); + } /* * Remove each interface route associated with a (just) detached * prefix, and reinstall the interface route for a (just) attached @@ -1411,17 +2917,25 @@ pfxlist_onlink_check(int nd6locked) * interfaces. Such cases will be handled in nd6_prefix_onlink, * so we don't have to care about them. */ - for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { + pr = nd_prefix.lh_first; + while (pr) { int e; - if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) + NDPR_LOCK(pr); + if (pr->ndpr_raf_onlink == 0 || + pr->ndpr_stateflags & NDPRF_STATIC || + pr->ndpr_stateflags & NDPRF_PROCESSED_ONLINK || + pr->ndpr_stateflags & NDPRF_DEFUNCT) { + NDPR_UNLOCK(pr); + pr = pr->ndpr_next; continue; - - if (pr->ndpr_raf_onlink == 0) - continue; - + } + pr->ndpr_stateflags |= NDPRF_PROCESSED_ONLINK; + NDPR_ADDREF_LOCKED(pr); if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { + NDPR_UNLOCK(pr); + lck_mtx_unlock(nd6_mutex); if ((e = nd6_prefix_offlink(pr)) != 0) { nd6log((LOG_ERR, "pfxlist_onlink_check: failed to " @@ -1429,18 +2943,41 @@ pfxlist_onlink_check(int nd6locked) ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, e)); } + lck_mtx_lock(nd6_mutex); + NDPR_REMREF(pr); + pr = nd_prefix.lh_first; + continue; } if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 && pr->ndpr_raf_onlink) { - if ((e = nd6_prefix_onlink(pr, 0, 1)) != 0) { + NDPR_UNLOCK(pr); + if ((e = nd6_prefix_onlink(pr)) != 0) { nd6log((LOG_ERR, "pfxlist_onlink_check: failed to " "make %s/%d offlink, errno=%d\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, e)); } + NDPR_REMREF(pr); + pr = nd_prefix.lh_first; + continue; + } else { + NDPR_UNLOCK(pr); } + NDPR_REMREF(pr); + pr = pr->ndpr_next; + } + LIST_FOREACH(prclear, &nd_prefix, ndpr_entry) { + NDPR_LOCK(prclear); + prclear->ndpr_stateflags &= ~NDPRF_PROCESSED_ONLINK; + NDPR_UNLOCK(prclear); + } + VERIFY(nd_prefix_busy); + nd_prefix_busy = FALSE; + if (nd_prefix_waiters > 0) { + nd_prefix_waiters = 0; + wakeup(nd_prefix_waitchan); } /* @@ -1450,117 +2987,307 @@ pfxlist_onlink_check(int nd6locked) * detached. Note, however, that a manually configured address should * always be attached. * The precise detection logic is same as the one for prefixes. + * + * ifnet_get_address_list_family_internal() may fail due to memory + * pressure, but we will eventually be called again when we receive + * another NA, RA, or when the link status changes. */ - for (ifa = in6_ifaddrs; ifa; ifa = ifa->ia_next) { - if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) + err = ifnet_get_address_list_family_internal(NULL, &ifap, AF_INET6, 0, + M_NOWAIT, 0); + if (err != 0 || ifap == NULL) { + nd6log((LOG_ERR, "%s: ifnet_get_address_list_family_internal " + "failed", __func__)); + return; + } + for (i = 0; ifap[i]; i++) { + ifa = ifatoia6(ifap[i]); + IFA_LOCK(&ifa->ia_ifa); + if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0 || + (ifap[i]->ifa_debug & IFD_ATTACHED) == 0) { + IFA_UNLOCK(&ifa->ia_ifa); continue; - - if (ifa->ia6_ndpr == NULL) { + } + if ((ndpr = ifa->ia6_ndpr) == NULL) { /* * This can happen when we first configure the address * (i.e. the address exists, but the prefix does not). * XXX: complicated relationships... */ + IFA_UNLOCK(&ifa->ia_ifa); continue; } + IFA_UNLOCK(&ifa->ia_ifa); - if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) + NDPR_LOCK(ndpr); + NDPR_ADDREF_LOCKED(ndpr); + if (find_pfxlist_reachable_router(ndpr)) { + if (NDPR_REMREF_LOCKED(ndpr) == NULL) { + found = 0; + } else { + NDPR_UNLOCK(ndpr); + found = 1; + } break; - } - if (ifa) { - for (ifa = in6_ifaddrs; ifa; ifa = ifa->ia_next) { - if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) + } + NDPR_UNLOCK(ndpr); + NDPR_REMREF(ndpr); + } + if (found) { + for (i = 0; ifap[i]; i++) { + ifa = ifatoia6(ifap[i]); + IFA_LOCK(&ifa->ia_ifa); + if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0 || + (ifap[i]->ifa_debug & IFD_ATTACHED) == 0) { + IFA_UNLOCK(&ifa->ia_ifa); continue; - - if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ + } + if ((ndpr = ifa->ia6_ndpr) == NULL) { + /* XXX: see above. */ + IFA_UNLOCK(&ifa->ia_ifa); continue; - - if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) - ifa->ia6_flags &= ~IN6_IFF_DETACHED; - else + } + IFA_UNLOCK(&ifa->ia_ifa); + NDPR_LOCK(ndpr); + NDPR_ADDREF_LOCKED(ndpr); + if (find_pfxlist_reachable_router(ndpr)) { + NDPR_UNLOCK(ndpr); + IFA_LOCK(&ifa->ia_ifa); + if (ifa->ia6_flags & IN6_IFF_DETACHED) { + ifa->ia6_flags &= ~IN6_IFF_DETACHED; + in6_ifaddr_set_dadprogress((struct in6_ifaddr *)ifa); + IFA_UNLOCK(&ifa->ia_ifa); + nd6_dad_start((struct ifaddr *)ifa, 0); + } else { + IFA_UNLOCK(&ifa->ia_ifa); + } + } else { + NDPR_UNLOCK(ndpr); + IFA_LOCK(&ifa->ia_ifa); ifa->ia6_flags |= IN6_IFF_DETACHED; + IFA_UNLOCK(&ifa->ia_ifa); + } + NDPR_REMREF(ndpr); } - } - else { - for (ifa = in6_ifaddrs; ifa; ifa = ifa->ia_next) { - if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) + } else { + for (i = 0; ifap[i]; i++) { + ifa = ifatoia6(ifap[i]); + IFA_LOCK(&ifa->ia_ifa); + if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) { + IFA_UNLOCK(&ifa->ia_ifa); continue; + } + if (ifa->ia6_flags & IN6_IFF_DETACHED) { + ifa->ia6_flags &= ~IN6_IFF_DETACHED; + in6_ifaddr_set_dadprogress((struct in6_ifaddr *)ifa); + IFA_UNLOCK(&ifa->ia_ifa); + /* Do we need a delay in this case? */ + nd6_dad_start((struct ifaddr *)ifa, 0); + } else { + IFA_UNLOCK(&ifa->ia_ifa); + } + } + } + ifnet_free_address_list(ifap); +} + +static struct nd_prefix * +nd6_prefix_equal_lookup(struct nd_prefix *pr, boolean_t primary_only) +{ + struct nd_prefix *opr; + + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + + for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { + if (opr == pr) + continue; + + NDPR_LOCK(opr); + if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) { + NDPR_UNLOCK(opr); + continue; + } + if (opr->ndpr_plen == pr->ndpr_plen && + in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, + &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen) && + (!primary_only || + !(opr->ndpr_stateflags & NDPRF_IFSCOPE))) { + NDPR_ADDREF_LOCKED(opr); + NDPR_UNLOCK(opr); + return (opr); + } + NDPR_UNLOCK(opr); + } + return (NULL); +} + +/* + * Synchronize the interface routes of similar prefixes on different + * interfaces; the one using the default interface would be (re)installed + * as a primary/non-scoped entry, and the rest as scoped entri(es). + */ +static void +nd6_prefix_sync(struct ifnet *ifp) +{ + struct nd_prefix *pr, *opr; + int err = 0; + + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + + if (ifp == NULL) + return; - ifa->ia6_flags &= ~IN6_IFF_DETACHED; + for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { + NDPR_LOCK(pr); + if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) { + NDPR_UNLOCK(pr); + continue; + } + if (pr->ndpr_ifp == ifp && + (pr->ndpr_stateflags & NDPRF_IFSCOPE) && + !IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) { + NDPR_UNLOCK(pr); + break; } + NDPR_UNLOCK(pr); } - if (nd6locked == 0) + + if (pr == NULL) + return; + + /* Remove conflicting entries */ + opr = nd6_prefix_equal_lookup(pr, TRUE); + if (opr != NULL) { lck_mtx_unlock(nd6_mutex); + err = nd6_prefix_offlink(opr); + lck_mtx_lock(nd6_mutex); + if (err != 0) { + nd6log((LOG_ERR, + "%s: failed to make %s/%d offlink on %s, " + "errno=%d\n", __func__, + ip6_sprintf(&opr->ndpr_prefix.sin6_addr), + opr->ndpr_plen, if_name(opr->ndpr_ifp), err)); + } + } else { + nd6log((LOG_ERR, + "%s: scoped %s/%d on %s has no matching unscoped prefix\n", + __func__, ip6_sprintf(&pr->ndpr_prefix.sin6_addr), + pr->ndpr_plen, if_name(pr->ndpr_ifp))); + } + + lck_mtx_unlock(nd6_mutex); + err = nd6_prefix_offlink(pr); + lck_mtx_lock(nd6_mutex); + if (err != 0) { + nd6log((LOG_ERR, + "%s: failed to make %s/%d offlink on %s, errno=%d\n", + __func__, ip6_sprintf(&pr->ndpr_prefix.sin6_addr), + pr->ndpr_plen, if_name(pr->ndpr_ifp), err)); + } + + /* Add the entries back */ + if (opr != NULL) { + err = nd6_prefix_onlink_scoped(opr, opr->ndpr_ifp->if_index); + if (err != 0) { + nd6log((LOG_ERR, + "%s: failed to make %s/%d scoped onlink on %s, " + "errno=%d\n", __func__, + ip6_sprintf(&opr->ndpr_prefix.sin6_addr), + opr->ndpr_plen, if_name(opr->ndpr_ifp), err)); + } + } + + err = nd6_prefix_onlink_scoped(pr, IFSCOPE_NONE); + if (err != 0) { + nd6log((LOG_ERR, + "%s: failed to make %s/%d onlink on %s, errno=%d\n", + __func__, ip6_sprintf(&pr->ndpr_prefix.sin6_addr), + pr->ndpr_plen, if_name(pr->ndpr_ifp), err)); + } + + if (err != 0) { + nd6log((LOG_ERR, + "%s: error promoting %s/%d to %s from %s\n", + __func__, ip6_sprintf(&pr->ndpr_prefix.sin6_addr), + pr->ndpr_plen, if_name(pr->ndpr_ifp), + (opr != NULL) ? if_name(opr->ndpr_ifp) : "NONE")); + } else { + nd6log2((LOG_INFO, + "%s: %s/%d promoted, previously on %s\n", + if_name(pr->ndpr_ifp), + ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, + (opr != NULL) ? if_name(opr->ndpr_ifp) : "NONE")); + } + + if (opr != NULL) + NDPR_REMREF(opr); } -int -nd6_prefix_onlink( - struct nd_prefix *pr, int rtlocked, int nd6locked) +static int +nd6_prefix_onlink_common(struct nd_prefix *pr, boolean_t force_scoped, + unsigned int ifscope) { struct ifaddr *ifa; struct ifnet *ifp = pr->ndpr_ifp; - struct sockaddr_in6 mask6; + struct sockaddr_in6 mask6, prefix; struct nd_prefix *opr; - u_long rtflags; - int error = 0; + u_int32_t rtflags; + int error = 0, prproxy = 0; struct rtentry *rt = NULL; + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); + /* sanity check */ + NDPR_LOCK(pr); if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { nd6log((LOG_ERR, - "nd6_prefix_onlink: %s/%d is already on-link\n", - ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen); - return(EEXIST)); + "%s: %s/%d on %s scoped=%d is already on-link\n", + __func__, ip6_sprintf(&pr->ndpr_prefix.sin6_addr), + pr->ndpr_plen, if_name(pr->ndpr_ifp), + (pr->ndpr_stateflags & NDPRF_IFSCOPE) ? 1 : 0); + NDPR_UNLOCK(pr); + return (EEXIST)); } + NDPR_UNLOCK(pr); /* * Add the interface route associated with the prefix. Before * installing the route, check if there's the same prefix on another * interface, and the prefix has already installed the interface route. - * Although such a configuration is expected to be rare, we explicitly - * allow it. */ - if (nd6locked == 0) - lck_mtx_lock(nd6_mutex); - else - lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); - for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { - if (opr == pr) - continue; - - if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) - continue; + opr = nd6_prefix_equal_lookup(pr, FALSE); + if (opr != NULL) + NDPR_REMREF(opr); - if (opr->ndpr_plen == pr->ndpr_plen && - in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, - &opr->ndpr_prefix.sin6_addr, - pr->ndpr_plen)) { - if (nd6locked == 0) - lck_mtx_unlock(nd6_mutex); - return(0); - } + if (!force_scoped) { + /* + * If a primary/non-scoped interface route already exists, + * install the new one as a scoped entry. If the existing + * interface route is scoped, install new as non-scoped. + */ + ifscope = (opr != NULL) ? ifp->if_index : IFSCOPE_NONE; + opr = nd6_prefix_equal_lookup(pr, TRUE); + if (opr != NULL) + NDPR_REMREF(opr); + else if (ifscope != IFSCOPE_NONE) + ifscope = IFSCOPE_NONE; } - if (nd6locked == 0) - lck_mtx_unlock(nd6_mutex); /* - * We prefer link-local addresses as the associated interface address. + * We prefer link-local addresses as the associated interface address. */ /* search for a link-local addr */ ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, - IN6_IFF_NOTREADY| - IN6_IFF_ANYCAST); + IN6_IFF_NOTREADY | IN6_IFF_ANYCAST); if (ifa == NULL) { - /* XXX: freebsd does not have ifa_ifwithaf */ - ifnet_lock_exclusive(ifp); - TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) - { - if (ifa->ifa_addr->sa_family == AF_INET6) - break; - } + struct in6_ifaddr *ia6; + ifnet_lock_shared(ifp); + IFP_TO_IA6(ifp, ia6); ifnet_lock_done(ifp); + if (ia6 != NULL) + ifa = &ia6->ia_ifa; /* should we care about ia6_flags? */ } + NDPR_LOCK(pr); if (ifa == NULL) { /* * This can still happen, when, for example, we receive an RA @@ -1573,21 +3300,26 @@ nd6_prefix_onlink( " to add route for a prefix(%s/%d) on %s\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(ifp))); - return(0); + NDPR_UNLOCK(pr); + return (0); } /* * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. * ifa->ifa_rtrequest = nd6_rtrequest; */ - bzero(&mask6, sizeof(mask6)); - mask6.sin6_len = sizeof(mask6); + bzero(&mask6, sizeof (mask6)); + mask6.sin6_len = sizeof (mask6); mask6.sin6_addr = pr->ndpr_mask; + prefix = pr->ndpr_prefix; + if ((rt = pr->ndpr_rt) != NULL) + pr->ndpr_rt = NULL; + NDPR_ADDREF_LOCKED(pr); /* keep reference for this routine */ + NDPR_UNLOCK(pr); - if (rtlocked == 0) - lck_mtx_lock(rt_mtx); - + IFA_LOCK_SPIN(ifa); rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP; + IFA_UNLOCK(ifa); if (nd6_need_cache(ifp)) { /* explicitly set in case ifa_flags does not set the flag. */ rtflags |= RTF_CLONING; @@ -1597,283 +3329,409 @@ nd6_prefix_onlink( */ rtflags &= ~RTF_CLONING; } - error = rtrequest_locked(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, - ifa->ifa_addr, (struct sockaddr *)&mask6, - rtflags, &rt); - if (error == 0) { - if (rt != NULL) /* this should be non NULL, though */ - nd6_rtmsg(RTM_ADD, rt); - pr->ndpr_stateflags |= NDPRF_ONLINK; + + lck_mtx_unlock(nd6_mutex); + + if (rt != NULL) { + rtfree(rt); + rt = NULL; } - else { + + error = rtrequest_scoped(RTM_ADD, (struct sockaddr *)&prefix, + ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags, &rt, + ifscope); + + /* + * Serialize the setting of NDPRF_PRPROXY. + */ + lck_mtx_lock(&proxy6_lock); + + if (rt != NULL) { + RT_LOCK(rt); + nd6_rtmsg(RTM_ADD, rt); + RT_UNLOCK(rt); + NDPR_LOCK(pr); + } else { + NDPR_LOCK(pr); nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a" - " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx " - "errno = %d\n", + " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx," + " scoped=%d, errno = %d\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(ifp), - ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr), - ip6_sprintf(&mask6.sin6_addr), rtflags, error)); + ip6_sprintf(&((struct sockaddr_in6 *) + (void *)ifa->ifa_addr)->sin6_addr), + ip6_sprintf(&mask6.sin6_addr), rtflags, + (ifscope != IFSCOPE_NONE), error)); } + NDPR_LOCK_ASSERT_HELD(pr); + + pr->ndpr_stateflags &= ~(NDPRF_IFSCOPE | NDPRF_PRPROXY); + + /* + * TODO: If the prefix route exists, we should really find it and + * refer the prefix to it; otherwise ndpr_rt is NULL. + */ + if (!(pr->ndpr_stateflags & NDPRF_DEFUNCT) && + (rt != NULL || error == EEXIST)) { + struct nd_ifinfo *ndi = NULL; + + VERIFY(pr->ndpr_prproxy_sols_cnt == 0); + VERIFY(RB_EMPTY(&pr->ndpr_prproxy_sols)); + + ndi = ND_IFINFO(ifp); + VERIFY((NULL != ndi) && (TRUE == ndi->initialized)); + lck_mtx_lock(&ndi->lock); + + pr->ndpr_rt = rt; /* keep reference from rtrequest */ + pr->ndpr_stateflags |= NDPRF_ONLINK; + if (ifscope != IFSCOPE_NONE) { + pr->ndpr_stateflags |= NDPRF_IFSCOPE; + } else if ((rtflags & RTF_CLONING) && + (ndi->flags & ND6_IFF_PROXY_PREFIXES) && + !IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) { + /* + * At present, in order for the prefix to be eligible + * as a proxying/proxied prefix, we require that the + * prefix route entry be marked as a cloning route with + * RTF_PROXY; i.e. nd6_need_cache() needs to return + * true for the interface type, hence the test for + * RTF_CLONING above. + */ + pr->ndpr_stateflags |= NDPRF_PRPROXY; + } + + lck_mtx_unlock(&ndi->lock); + } else if (rt != NULL && pr->ndpr_stateflags & NDPRF_DEFUNCT) + rtfree(rt); + + prproxy = (pr->ndpr_stateflags & NDPRF_PRPROXY); + VERIFY(!prproxy || !(pr->ndpr_stateflags & NDPRF_IFSCOPE)); + NDPR_UNLOCK(pr); + + IFA_REMREF(ifa); + + /* + * If this is an upstream prefix, find the downstream ones (if any) + * and re-configure their prefix routes accordingly. Otherwise, + * this could be potentially be a downstream prefix, and so find the + * upstream prefix, if any. + */ + nd6_prproxy_prelist_update(pr, prproxy ? pr : NULL); + + NDPR_REMREF(pr); /* release reference for this routine */ + lck_mtx_unlock(&proxy6_lock); - if (rt != NULL) - rtunref(rt); + lck_mtx_lock(nd6_mutex); - if (rtlocked == 0) - lck_mtx_unlock(rt_mtx); - return(error); + return (error); } int -nd6_prefix_offlink( - struct nd_prefix *pr) +nd6_prefix_onlink(struct nd_prefix *pr) { - int error = 0; + return (nd6_prefix_onlink_common(pr, FALSE, IFSCOPE_NONE)); +} + +int +nd6_prefix_onlink_scoped(struct nd_prefix *pr, unsigned int ifscope) +{ + return (nd6_prefix_onlink_common(pr, TRUE, ifscope)); +} + +int +nd6_prefix_offlink(struct nd_prefix *pr) +{ + int plen, error = 0, prproxy; struct ifnet *ifp = pr->ndpr_ifp; - struct nd_prefix *opr; - struct sockaddr_in6 sa6, mask6; - struct rtentry *rt = NULL; + struct sockaddr_in6 sa6, mask6, prefix; + struct rtentry *rt = NULL, *ndpr_rt = NULL; + unsigned int ifscope; + + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED); /* sanity check */ + NDPR_LOCK(pr); if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { nd6log((LOG_ERR, - "nd6_prefix_offlink: %s/%d is already off-link\n", - ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen)); - return(EEXIST); + "nd6_prefix_offlink: %s/%d on %s scoped=%d is already " + "off-link\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), + pr->ndpr_plen, if_name(pr->ndpr_ifp), + (pr->ndpr_stateflags & NDPRF_IFSCOPE) ? 1 : 0)); + NDPR_UNLOCK(pr); + return (EEXIST); } - bzero(&sa6, sizeof(sa6)); + bzero(&sa6, sizeof (sa6)); sa6.sin6_family = AF_INET6; - sa6.sin6_len = sizeof(sa6); + sa6.sin6_len = sizeof (sa6); bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, - sizeof(struct in6_addr)); - bzero(&mask6, sizeof(mask6)); + sizeof (struct in6_addr)); + bzero(&mask6, sizeof (mask6)); mask6.sin6_family = AF_INET6; - mask6.sin6_len = sizeof(sa6); - bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); - lck_mtx_lock(rt_mtx); - error = rtrequest_locked(RTM_DELETE, (struct sockaddr *)&sa6, NULL, - (struct sockaddr *)&mask6, 0, &rt); - if (error == 0) { - pr->ndpr_stateflags &= ~NDPRF_ONLINK; - + mask6.sin6_len = sizeof (sa6); + bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof (struct in6_addr)); + prefix = pr->ndpr_prefix; + plen = pr->ndpr_plen; + if ((ndpr_rt = pr->ndpr_rt) != NULL) + pr->ndpr_rt = NULL; + NDPR_ADDREF_LOCKED(pr); /* keep reference for this routine */ + NDPR_UNLOCK(pr); + + ifscope = (pr->ndpr_stateflags & NDPRF_IFSCOPE) ? + ifp->if_index : IFSCOPE_NONE; + + error = rtrequest_scoped(RTM_DELETE, (struct sockaddr *)&sa6, + NULL, (struct sockaddr *)&mask6, 0, &rt, ifscope); + + if (rt != NULL) { /* report the route deletion to the routing socket. */ - if (rt != NULL) - nd6_rtmsg(RTM_DELETE, rt); + RT_LOCK(rt); + nd6_rtmsg(RTM_DELETE, rt); + RT_UNLOCK(rt); + rtfree(rt); - /* - * There might be the same prefix on another interface, - * the prefix which could not be on-link just because we have - * the interface route (see comments in nd6_prefix_onlink). - * If there's one, try to make the prefix on-link on the - * interface. - */ - lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_OWNED); - for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { - if (opr == pr) - continue; - - if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0) - continue; + } else { + nd6log((LOG_ERR, + "nd6_prefix_offlink: failed to delete route: " + "%s/%d on %s, scoped %d, (errno = %d)\n", + ip6_sprintf(&sa6.sin6_addr), plen, if_name(ifp), + (ifscope != IFSCOPE_NONE), error)); + } - /* - * KAME specific: detached prefixes should not be - * on-link. - */ - if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0) - continue; + if (ndpr_rt != NULL) + rtfree(ndpr_rt); - if (opr->ndpr_plen == pr->ndpr_plen && - in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, - &opr->ndpr_prefix.sin6_addr, - pr->ndpr_plen)) { - int e; + lck_mtx_lock(&proxy6_lock); - if ((e = nd6_prefix_onlink(opr, 1, 1)) != 0) { - nd6log((LOG_ERR, - "nd6_prefix_offlink: failed to " - "recover a prefix %s/%d from %s " - "to %s (errno = %d)\n", - ip6_sprintf(&opr->ndpr_prefix.sin6_addr), - opr->ndpr_plen, if_name(ifp), - if_name(opr->ndpr_ifp), e)); - } - } - } - } - else { - /* XXX: can we still set the NDPRF_ONLINK flag? */ - nd6log((LOG_ERR, - "nd6_prefix_offlink: failed to delete route: " - "%s/%d on %s (errno = %d)\n", - ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp), - error)); + NDPR_LOCK(pr); + prproxy = (pr->ndpr_stateflags & NDPRF_PRPROXY); + VERIFY(!prproxy || !(pr->ndpr_stateflags & NDPRF_IFSCOPE)); + pr->ndpr_stateflags &= ~(NDPRF_ONLINK | NDPRF_IFSCOPE | NDPRF_PRPROXY); + if (pr->ndpr_prproxy_sols_cnt > 0) { + VERIFY(prproxy); + nd6_prproxy_sols_reap(pr); + VERIFY(pr->ndpr_prproxy_sols_cnt == 0); + VERIFY(RB_EMPTY(&pr->ndpr_prproxy_sols)); } + NDPR_UNLOCK(pr); - if (rt != NULL) - rtfree_locked(rt); + /* + * If this was an upstream prefix, find the downstream ones and do + * some cleanups. If this was a downstream prefix, the prefix route + * has been removed from the routing table above, but there may be + * other tasks to perform. + */ + nd6_prproxy_prelist_update(pr, prproxy ? pr : NULL); - lck_mtx_unlock(rt_mtx); + NDPR_REMREF(pr); /* release reference for this routine */ + lck_mtx_unlock(&proxy6_lock); - return(error); + return (error); } static struct in6_ifaddr * -in6_ifadd( - struct nd_prefix *pr, - struct in6_addr *ifid) /* Mobile IPv6 addition */ +in6_pfx_newpersistaddr(struct nd_prefix *pr, int mcast, int *errorp) { - struct ifnet *ifp = pr->ndpr_ifp; - struct ifaddr *ifa; - struct in6_aliasreq ifra; - struct in6_ifaddr *ia, *ib; - int error, plen0; + struct in6_ifaddr *ia6 = NULL; + struct ifnet *ifp = NULL; + struct nd_ifinfo *ndi = NULL; struct in6_addr mask; - int prefixlen = pr->ndpr_plen; + struct in6_aliasreq ifra; + int error, ifaupdate, iidlen, notcga; - in6_len2mask(&mask, prefixlen); + VERIFY(pr != NULL); + VERIFY(errorp != NULL); + + NDPR_LOCK(pr); + ifp = pr->ndpr_ifp; + ia6 = NULL; + error = 0; /* - * find a link-local address (will be interface ID). - * Is it really mandatory? Theoretically, a global or a site-local - * address can be configured without a link-local address, if we - * have a unique interface identifier... - * - * it is not mandatory to have a link-local address, we can generate - * interface identifier on the fly. we do this because: - * (1) it should be the easiest way to find interface identifier. - * (2) RFC2462 5.4 suggesting the use of the same interface identifier - * for multiple addresses on a single interface, and possible shortcut - * of DAD. we omitted DAD for this reason in the past. - * (3) a user can prevent autoconfiguration of global address - * by removing link-local address by hand (this is partly because we - * don't have other way to control the use of IPv6 on a interface. - * this has been our design choice - cf. NRL's "ifconfig auto"). - * (4) it is easier to manage when an interface has addresses - * with the same interface identifier, than to have multiple addresses - * with different interface identifiers. - * - * Mobile IPv6 addition: allow for caller to specify a wished interface - * ID. This is to not break connections when moving addresses between - * interfaces. + * Prefix Length check: + * If the sum of the prefix length and interface identifier + * length does not equal 128 bits, the Prefix Information + * option MUST be ignored. The length of the interface + * identifier is defined in a separate link-type specific + * document. */ - ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */ - if (ifa) - ib = (struct in6_ifaddr *)ifa; - else - return NULL; - -#if 0 /* don't care link local addr state, and always do DAD */ - /* if link-local address is not eligible, do not autoconfigure. */ - if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) { - printf("in6_ifadd: link-local address not ready\n"); - return NULL; + iidlen = in6_if2idlen(ifp); + if (iidlen < 0) { + error = EADDRNOTAVAIL; + /* this should not happen, so we always log it. */ + log(LOG_ERR, "%s: IID length undefined (%s)\n", + __func__, if_name(ifp)); + goto unlock1; + } else if (iidlen != 64) { + error = EADDRNOTAVAIL; + /* + * stateless autoconfiguration not yet well-defined for IID + * lengths other than 64 octets. Just give up for now. + */ + nd6log((LOG_INFO, "%s: IID length not 64 octets (%s)\n", + __func__, if_name(ifp))); + goto unlock1; } -#endif - /* prefixlen + ifidlen must be equal to 128 */ - plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); - if (prefixlen != plen0) { - nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " - "(prefix=%d ifid=%d)\n", - if_name(ifp), prefixlen, 128 - plen0)); - return NULL; + if (iidlen + pr->ndpr_plen != 128) { + error = EADDRNOTAVAIL; + nd6log((LOG_INFO, + "%s: invalid prefix length %d for %s, ignored\n", + __func__, pr->ndpr_plen, if_name(ifp))); + goto unlock1; } - /* make ifaddr */ - - bzero(&ifra, sizeof(ifra)); - /* - * in6_update_ifa() does not use ifra_name, but we accurately set it - * for safety. - */ - strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); + bzero(&ifra, sizeof (ifra)); + strlcpy(ifra.ifra_name, if_name(ifp), sizeof (ifra.ifra_name)); ifra.ifra_addr.sin6_family = AF_INET6; - ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); + ifra.ifra_addr.sin6_len = sizeof (struct sockaddr_in6); + /* prefix */ bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr, - sizeof(ifra.ifra_addr.sin6_addr)); + sizeof (ifra.ifra_addr.sin6_addr)); + in6_len2mask(&mask, pr->ndpr_plen); ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; - /* interface ID */ - if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid)) - ifid = &ib->ia_addr.sin6_addr; - ifra.ifra_addr.sin6_addr.s6_addr32[0] - |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]); - ifra.ifra_addr.sin6_addr.s6_addr32[1] - |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]); - ifra.ifra_addr.sin6_addr.s6_addr32[2] - |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]); - ifra.ifra_addr.sin6_addr.s6_addr32[3] - |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]); - + ndi = ND_IFINFO(ifp); + VERIFY(ndi->initialized); + lck_mtx_lock(&ndi->lock); + + notcga = nd6_send_opstate == ND6_SEND_OPMODE_DISABLED || + (ndi->flags & ND6_IFF_INSECURE) != 0; + + lck_mtx_unlock(&ndi->lock); + NDPR_UNLOCK(pr); + + if (notcga) { + ia6 = in6ifa_ifpforlinklocal(ifp, 0); + if (ia6 == NULL) { + error = EADDRNOTAVAIL; + nd6log((LOG_INFO, "%s: no link-local address (%s)\n", + __func__, if_name(ifp))); + goto done; + } + + IFA_LOCK(&ia6->ia_ifa); + ifra.ifra_addr.sin6_addr.s6_addr32[0] |= + (ia6->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]); + ifra.ifra_addr.sin6_addr.s6_addr32[1] |= + (ia6->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]); + ifra.ifra_addr.sin6_addr.s6_addr32[2] |= + (ia6->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]); + ifra.ifra_addr.sin6_addr.s6_addr32[3] |= + (ia6->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]); + IFA_UNLOCK(&ia6->ia_ifa); + IFA_REMREF(&ia6->ia_ifa); + ia6 = NULL; + } else { + in6_cga_node_lock(); + struct in6_cga_prepare local_cga_prepare; + + if (ndi->cga_initialized) { + bcopy(&(ndi->local_cga_modifier), + &(local_cga_prepare.cga_modifier), + sizeof(local_cga_prepare.cga_modifier)); + error = in6_cga_generate(&local_cga_prepare, 0, + &ifra.ifra_addr.sin6_addr); + } else { + error = in6_cga_generate(NULL, 0, + &ifra.ifra_addr.sin6_addr); + } + in6_cga_node_unlock(); + if (error == 0) + ifra.ifra_flags |= IN6_IFF_SECURED; + else { + nd6log((LOG_ERR, "%s: no CGA available (%s)\n", + __func__, if_name(ifp))); + goto done; + } + } + + VERIFY(ia6 == NULL); + /* new prefix mask. */ - ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); + ifra.ifra_prefixmask.sin6_len = sizeof (struct sockaddr_in6); ifra.ifra_prefixmask.sin6_family = AF_INET6; bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, - sizeof(ifra.ifra_prefixmask.sin6_addr)); + sizeof (ifra.ifra_prefixmask.sin6_addr)); - /* - * lifetime. - * XXX: in6_init_address_ltimes would override these values later. - * We should reconsider this logic. - */ + /* lifetimes. */ ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; - /* XXX: scope zone ID? */ - + /* address flags */ ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ + /* - * temporarily set the nopfx flag to avoid conflict. - * XXX: we should reconsider the entire mechanism about prefix - * manipulation. + * Make sure that we do not have this address already. This should + * usually not happen, but we can still see this case, e.g., if we + * have manually configured the exact address to be configured. */ - ifra.ifra_flags |= IN6_IFF_NOPFX; + if ((ia6 = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr)) + != NULL) { + error = EADDRNOTAVAIL; + IFA_REMREF(&ia6->ia_ifa); + ia6 = NULL; + + /* this should be rare enough to make an explicit log */ + log(LOG_INFO, "%s: %s is already configured!\n", + __func__, ip6_sprintf(&ifra.ifra_addr.sin6_addr)); + goto done; + } /* - * keep the new address, regardless of the result of in6_update_ifa. - * XXX: this address is now meaningless. - * We should reconsider its role. + * Allocate ifaddr structure, link into chain, etc. + * If we are going to create a new address upon receiving a multicasted + * RA, we need to impose a random delay before starting DAD. + * [RFC 4862, Section 5.4.2] */ - pr->ndpr_addr = ifra.ifra_addr.sin6_addr; - - /* allocate ifaddr structure, link into chain, etc. */ - if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { + ifaupdate = IN6_IFAUPDATE_NOWAIT; + if (mcast) + ifaupdate |= IN6_IFAUPDATE_DADDELAY; + error = in6_update_ifa(ifp, &ifra, ifaupdate, &ia6); + if (error != 0) { nd6log((LOG_ERR, - "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", - ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp), - error)); - return(NULL); /* ifaddr must not have been allocated. */ + "%s: failed to make ifaddr %s on %s (errno=%d)\n", + __func__, ip6_sprintf(&ifra.ifra_addr.sin6_addr), + if_name(ifp), error)); + error = EADDRNOTAVAIL; + goto done; } - ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); + VERIFY(ia6 != NULL); + in6_post_msg(ifp, KEV_INET6_NEW_RTADV_ADDR, ia6, NULL); + goto done; - in6_post_msg(ifp, KEV_INET6_NEW_RTADV_ADDR, ia); +unlock1: + NDPR_UNLOCK(pr); - return(ia); /* this must NOT be NULL. */ +done: + *errorp = error; + return (ia6); } +#define IA6_NONCONST(i) ((struct in6_ifaddr *)(uintptr_t)(i)) + int -in6_tmpifadd( - const struct in6_ifaddr *ia0, /* corresponding public address */ - int forcegen) +in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen) { struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; - struct in6_ifaddr *newia; + struct in6_ifaddr *ia, *newia; struct in6_aliasreq ifra; - int i, error; + int i, error, ifaupdate; int trylimit = 3; /* XXX: adhoc value */ u_int32_t randid[2]; time_t vltime0, pltime0; - struct timeval timenow; - - getmicrotime(&timenow); + uint64_t timenow = net_uptime(); + struct in6_addr addr; + struct nd_prefix *ndpr; - bzero(&ifra, sizeof(ifra)); - strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); + bzero(&ifra, sizeof (ifra)); + strlcpy(ifra.ifra_name, if_name(ifp), sizeof (ifra.ifra_name)); + IFA_LOCK(&IA6_NONCONST(ia0)->ia_ifa); ifra.ifra_addr = ia0->ia_addr; /* copy prefix mask */ ifra.ifra_prefixmask = ia0->ia_prefixmask; @@ -1882,27 +3740,30 @@ in6_tmpifadd( ifra.ifra_addr.sin6_addr.s6_addr32[i] &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; } + addr = ia0->ia_addr.sin6_addr; + IFA_UNLOCK(&IA6_NONCONST(ia0)->ia_ifa); - again: - in6_get_tmpifid(ifp, (u_int8_t *)randid, - (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], - forcegen); - ifra.ifra_addr.sin6_addr.s6_addr32[2] - |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); - ifra.ifra_addr.sin6_addr.s6_addr32[3] - |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); +again: + in6_iid_mktmp(ifp, (u_int8_t *)randid, + (const u_int8_t *)&addr.s6_addr[8], forcegen); + + ifra.ifra_addr.sin6_addr.s6_addr32[2] |= + (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); + ifra.ifra_addr.sin6_addr.s6_addr32[3] |= + (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); /* - * If by chance the new temporary address is the same as an address - * already assigned to the interface, generate a new randomized - * interface identifier and repeat this step. - * RFC 3041 3.3 (4). + * in6_iid_mktmp() quite likely provided a unique interface ID. + * However, we may still have a chance to see collision, because + * there may be a time lag between generation of the ID and generation + * of the address. So, we'll do one more sanity check. */ - if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) { + if ((ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr)) != NULL) { + IFA_REMREF(&ia->ia_ifa); if (trylimit-- == 0) { nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find " "a unique random IFID\n")); - return(EEXIST); + return (EEXIST); } forcegen = 1; goto again; @@ -1910,56 +3771,85 @@ in6_tmpifadd( /* * The Valid Lifetime is the lower of the Valid Lifetime of the - * public address or TEMP_VALID_LIFETIME. + * public address or TEMP_VALID_LIFETIME. * The Preferred Lifetime is the lower of the Preferred Lifetime - * of the public address or TEMP_PREFERRED_LIFETIME - - * DESYNC_FACTOR. + * of the public address or TEMP_PREFERRED_LIFETIME - + * DESYNC_FACTOR. */ - if (ia0->ia6_lifetime.ia6t_expire != 0) { - vltime0 = IFA6_IS_INVALID(ia0) ? 0 : - (ia0->ia6_lifetime.ia6t_expire - timenow.tv_sec); + IFA_LOCK(&IA6_NONCONST(ia0)->ia_ifa); + if (ia0->ia6_lifetime.ia6ti_vltime != ND6_INFINITE_LIFETIME) { + vltime0 = IFA6_IS_INVALID(ia0, timenow) ? 0 : + (ia0->ia6_lifetime.ia6ti_vltime - + (timenow - ia0->ia6_updatetime)); if (vltime0 > ip6_temp_valid_lifetime) vltime0 = ip6_temp_valid_lifetime; - } else + } else { vltime0 = ip6_temp_valid_lifetime; - if (ia0->ia6_lifetime.ia6t_preferred != 0) { - pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : - (ia0->ia6_lifetime.ia6t_preferred - timenow.tv_sec); - if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){ + } + if (ia0->ia6_lifetime.ia6ti_pltime != ND6_INFINITE_LIFETIME) { + pltime0 = IFA6_IS_DEPRECATED(ia0, timenow) ? 0 : + (ia0->ia6_lifetime.ia6ti_pltime - + (timenow - ia0->ia6_updatetime)); + if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor) pltime0 = ip6_temp_preferred_lifetime - - ip6_desync_factor; - } - } else + ip6_desync_factor; + } else { pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor; + } ifra.ifra_lifetime.ia6t_vltime = vltime0; ifra.ifra_lifetime.ia6t_pltime = pltime0; - + IFA_UNLOCK(&IA6_NONCONST(ia0)->ia_ifa); /* * A temporary address is created only if this calculated Preferred * Lifetime is greater than REGEN_ADVANCE time units. */ if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance) - return(0); + return (0); /* XXX: scope zone ID? */ ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); /* allocate ifaddr structure, link into chain, etc. */ - if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) - return(error); - - newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); - if (newia == NULL) { /* XXX: can it happen? */ - nd6log((LOG_ERR, - "in6_tmpifadd: ifa update succeeded, but we got " - "no ifaddr\n")); - return(EINVAL); /* XXX */ + ifaupdate = IN6_IFAUPDATE_NOWAIT | IN6_IFAUPDATE_DADDELAY; + error = in6_update_ifa(ifp, &ifra, ifaupdate, &newia); + if (error != 0) { + nd6log((LOG_ERR, "in6_tmpifadd: failed to add address.\n")); + return (error); } - lck_mtx_lock(nd6_mutex); - newia->ia6_ndpr = ia0->ia6_ndpr; - newia->ia6_ndpr->ndpr_refcnt++; + VERIFY(newia != NULL); + IFA_LOCK(&IA6_NONCONST(ia0)->ia_ifa); + ndpr = ia0->ia6_ndpr; + if (ndpr == NULL) { + /* + * We lost the race with another thread that has purged + * ia0 address; in this case, purge the tmp addr as well. + */ + nd6log((LOG_ERR, "in6_tmpifadd: no public address\n")); + VERIFY(!(ia0->ia6_flags & IN6_IFF_AUTOCONF)); + IFA_UNLOCK(&IA6_NONCONST(ia0)->ia_ifa); + in6_purgeaddr(&newia->ia_ifa); + IFA_REMREF(&newia->ia_ifa); + return (EADDRNOTAVAIL); + } + NDPR_ADDREF(ndpr); /* for us */ + IFA_UNLOCK(&IA6_NONCONST(ia0)->ia_ifa); + IFA_LOCK(&newia->ia_ifa); + if (newia->ia6_ndpr != NULL) { + NDPR_LOCK(newia->ia6_ndpr); + VERIFY(newia->ia6_ndpr->ndpr_addrcnt != 0); + newia->ia6_ndpr->ndpr_addrcnt--; + NDPR_UNLOCK(newia->ia6_ndpr); + NDPR_REMREF(newia->ia6_ndpr); /* release addr reference */ + } + newia->ia6_ndpr = ndpr; + NDPR_LOCK(newia->ia6_ndpr); + newia->ia6_ndpr->ndpr_addrcnt++; + VERIFY(newia->ia6_ndpr->ndpr_addrcnt != 0); + NDPR_ADDREF_LOCKED(newia->ia6_ndpr); /* for addr reference */ + NDPR_UNLOCK(newia->ia6_ndpr); + IFA_UNLOCK(&newia->ia_ifa); /* * A newly added address might affect the status of other addresses. * XXX: when the temporary address is generated with a new public @@ -1968,19 +3858,31 @@ in6_tmpifadd( * and, in fact, we surely need the check when we create a new * temporary address due to deprecation of an old temporary address. */ - pfxlist_onlink_check(1); + lck_mtx_lock(nd6_mutex); + pfxlist_onlink_check(); lck_mtx_unlock(nd6_mutex); + IFA_REMREF(&newia->ia_ifa); - return(0); -} + /* remove our reference */ + NDPR_REMREF(ndpr); + + return (0); +} +#undef IA6_NONCONST int in6_init_prefix_ltimes(struct nd_prefix *ndpr) { - struct timeval timenow; + struct timeval caltime; + u_int64_t timenow = net_uptime(); + + NDPR_LOCK_ASSERT_HELD(ndpr); + + getmicrotime(&caltime); + ndpr->ndpr_base_calendartime = caltime.tv_sec; + ndpr->ndpr_base_uptime = timenow; - getmicrotime(&timenow); - /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */ + /* check if preferred lifetime > valid lifetime. RFC 4862 5.5.3 (c) */ if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime" "(%d) is greater than valid lifetime(%d)\n", @@ -1990,35 +3892,35 @@ in6_init_prefix_ltimes(struct nd_prefix *ndpr) if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) ndpr->ndpr_preferred = 0; else - ndpr->ndpr_preferred = timenow.tv_sec + ndpr->ndpr_pltime; + ndpr->ndpr_preferred = timenow + ndpr->ndpr_pltime; if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) ndpr->ndpr_expire = 0; else - ndpr->ndpr_expire = timenow.tv_sec + ndpr->ndpr_vltime; + ndpr->ndpr_expire = timenow + ndpr->ndpr_vltime; - return 0; + return (0); } static void -in6_init_address_ltimes(__unused struct nd_prefix *new, struct in6_addrlifetime *lt6) +in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) { - struct timeval timenow; +#pragma unused(new) + uint64_t timenow = net_uptime(); - getmicrotime(&timenow); /* Valid lifetime must not be updated unless explicitly specified. */ /* init ia6t_expire */ - if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) + if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) { lt6->ia6t_expire = 0; - else { - lt6->ia6t_expire = timenow.tv_sec; + } else { + lt6->ia6t_expire = timenow; lt6->ia6t_expire += lt6->ia6t_vltime; } /* init ia6t_preferred */ - if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) + if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) { lt6->ia6t_preferred = 0; - else { - lt6->ia6t_preferred = timenow.tv_sec; + } else { + lt6->ia6t_preferred = timenow; lt6->ia6t_preferred += lt6->ia6t_pltime; } } @@ -2039,12 +3941,12 @@ rt6_flush( if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { return; } - lck_mtx_lock(rt_mtx); + lck_mtx_lock(rnh_lock); /* XXX: hack for KAME's link-local address kludge */ gateway->s6_addr16[1] = htons(ifp->if_index); rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); - lck_mtx_unlock(rt_mtx); + lck_mtx_unlock(rnh_lock); } static int @@ -2052,36 +3954,47 @@ rt6_deleteroute( struct radix_node *rn, void *arg) { -#define SIN6(s) ((struct sockaddr_in6 *)s) struct rtentry *rt = (struct rtentry *)rn; struct in6_addr *gate = (struct in6_addr *)arg; - lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_OWNED); + lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED); - if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) - return(0); - - if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) - return(0); + RT_LOCK(rt); + if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) { + RT_UNLOCK(rt); + return (0); + } + if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) { + RT_UNLOCK(rt); + return (0); + } /* * Do not delete a static route. * XXX: this seems to be a bit ad-hoc. Should we consider the * 'cloned' bit instead? */ - if ((rt->rt_flags & RTF_STATIC) != 0) - return(0); - + if ((rt->rt_flags & RTF_STATIC) != 0) { + RT_UNLOCK(rt); + return (0); + } /* * We delete only host route. This means, in particular, we don't * delete default route. */ - if ((rt->rt_flags & RTF_HOST) == 0) - return(0); + if ((rt->rt_flags & RTF_HOST) == 0) { + RT_UNLOCK(rt); + return (0); + } - return(rtrequest_locked(RTM_DELETE, rt_key(rt), - rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0)); -#undef SIN6 + /* + * Safe to drop rt_lock and use rt_key, rt_gateway, since holding + * rnh_lock here prevents another thread from calling rt_setgate() + * on this route. + */ + RT_UNLOCK(rt); + return (rtrequest_locked(RTM_DELETE, rt_key(rt), rt->rt_gateway, + rt_mask(rt), rt->rt_flags, 0)); } int @@ -2089,18 +4002,35 @@ nd6_setdefaultiface( int ifindex) { int error = 0; + ifnet_t def_ifp = NULL; - if (ifindex < 0 || if_index < ifindex) - return(EINVAL); + lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED); + + ifnet_head_lock_shared(); + if (ifindex < 0 || if_index < ifindex) { + ifnet_head_done(); + return (EINVAL); + } + def_ifp = ifindex2ifnet[ifindex]; + ifnet_head_done(); lck_mtx_lock(nd6_mutex); if (nd6_defifindex != ifindex) { + struct ifnet *odef_ifp = nd6_defifp; + nd6_defifindex = ifindex; if (nd6_defifindex > 0) - nd6_defifp = ifindex2ifnet[nd6_defifindex]; + nd6_defifp = def_ifp; else nd6_defifp = NULL; + if (nd6_defifp != NULL) + nd6log((LOG_INFO, "%s: is now the default " + "interface (was %s)\n", if_name(nd6_defifp), + odef_ifp != NULL ? if_name(odef_ifp) : "NONE")); + else + nd6log((LOG_INFO, "No default interface set\n")); + /* * If the Default Router List is empty, install a route * to the specified interface as default or remove the default @@ -2109,17 +4039,22 @@ nd6_setdefaultiface( * we do this here to avoid re-install the default route * if the list is NOT empty. */ - if (TAILQ_FIRST(&nd_defrouter) == NULL) - defrouter_select(); + if (odef_ifp != NULL) { + defrouter_select(odef_ifp); + } + + if (nd6_defifp != NULL) { + defrouter_select(nd6_defifp); + nd6_prefix_sync(nd6_defifp); + } /* - * Our current implementation assumes one-to-one maping between + * Our current implementation assumes one-to-one mapping between * interfaces and links, so it would be natural to use the * default interface as the default link. */ scope6_setdefault(nd6_defifp); } - lck_mtx_unlock(nd6_mutex); - return(error); + return (error); }