/* * Copyright (c) 2003-2022 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void defrouter_addreq(struct nd_defrouter *, struct nd_route_info *, boolean_t); static void defrouter_delreq(struct nd_defrouter *, struct nd_route_info *); static struct nd_defrouter *defrtrlist_update_common(struct nd_defrouter *, struct nd_drhead *, boolean_t); static void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *); static void pfxrtr_del(struct nd_pfxrouter *, struct nd_prefix *); static struct nd_pfxrouter *find_pfxlist_reachable_router(struct nd_prefix *); static void nd6_rtmsg(u_char, struct rtentry *); 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 in6_addrlifetime *); static int rt6_deleteroute(struct radix_node *, void *); static struct nd_defrouter *nddr_alloc(zalloc_flags_t); 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 = NULL; int nd6_defifindex = 0; static unsigned int nd6_defrouter_genid; int ip6_use_tempaddr = IP6_USE_TMPADDR_DEFAULT; /* use temp addr by default for testing now */ int ip6_ula_use_tempaddr = IP6_ULA_USE_TMPADDR_DEFAULT; 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. * 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; /* 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; #define equal(a1, a2) (bcmp((caddr_t)(a1), (caddr_t)(a2), (a1)->sa_len) == 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 struct zone *ndpr_zone; /* zone for nd_prefix */ #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 nddr_addref and nddr_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 struct zone *nddr_zone; /* zone for nd_defrouter */ #define NDDR_ZONE_NAME "nd6_defrouter" /* zone name */ static KALLOC_TYPE_DEFINE(ndprtr_zone, struct nd_pfxrouter, NET_KT_DEFAULT); #define TWOHOUR (120*60) extern int nd6_process_rti; /* Default to 0 for now */ static void nd6_prefix_glb_init(void) { PE_parse_boot_argn("ifa_debug", &ndpr_debug, sizeof(ndpr_debug)); vm_size_t ndpr_size = (ndpr_debug == 0) ? sizeof(struct nd_prefix) : sizeof(struct nd_prefix_dbg); ndpr_zone = zone_create(NDPR_ZONE_NAME, ndpr_size, ZC_ZFREE_CLEARMEM); } static void nd6_defrouter_glb_init(void) { PE_parse_boot_argn("ifa_debug", &nddr_debug, sizeof(nddr_debug)); vm_size_t nddr_size = (nddr_debug == 0) ? sizeof(struct nd_defrouter) : sizeof(struct nd_defrouter_dbg); nddr_zone = zone_create(NDDR_ZONE_NAME, nddr_size, ZC_ZFREE_CLEARMEM); } void nd6_rtr_init(void) { nd6_prefix_glb_init(); nd6_defrouter_glb_init(); } /* * Receive Router Solicitation Message - just for routers. * Router solicitation/advertisement is mostly managed by userland program * (rtadvd) so here we have no function like nd6_ra_output(). * * Based on RFC 2461 */ void nd6_rs_input( struct mbuf *m, int off, int icmp6len) { struct ifnet *ifp = m->m_pkthdr.rcvif; struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct nd_router_solicit *nd_rs = NULL; struct in6_addr saddr6 = ip6->ip6_src; char *lladdr = NULL; int lladdrlen = 0; 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_forwarding || ifp->if_ipv6_router_mode == IPV6_ROUTER_MODE_DISABLED) { goto freeit; } /* Sanity checks */ if (ip6->ip6_hlim != IPV6_MAXHLIM) { nd6log(error, "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n", ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), if_name(ifp)); goto bad; } /* * 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(&ip6->ip6_src)) { goto freeit; } else { struct sockaddr_in6 src_sa6; SOCKADDR_ZERO(&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; src_sa6.sin6_scope_id = (!in6_embedded_scope && IN6_IS_SCOPE_EMBED(&src_sa6.sin6_addr)) ? ip6_input_getsrcifscope(m) : IFSCOPE_NONE; if (!nd6_is_addr_neighbor(&src_sa6, ifp, 0)) { nd6log(info, "nd6_rs_input: " "RS packet from non-neighbor\n"); goto freeit; } } IP6_EXTHDR_CHECK(m, off, icmp6len, return ); ip6 = mtod(m, struct ip6_hdr *); nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); icmp6len -= sizeof(*nd_rs); nd6_option_init(nd_rs + 1, icmp6len, &ndopts); if (nd6_options(&ndopts) < 0) { nd6log(info, "nd6_rs_input: invalid ND option, ignored\n"); /* nd6_options have incremented stats */ goto freeit; } if (ndopts.nd_opts_src_lladdr) { lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; } if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { nd6log(info, "nd6_rs_input: lladdrlen mismatch for %s " "(if %d, RS packet %d)\n", ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2); goto bad; } nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0, NULL); freeit: m_freem(m); return; bad: icmp6stat.icp6s_badrs++; m_freem(m); } #define ND_OPT_LEN_TO_BYTE_SCALE 3 /* ND opt len is in units of 8 octets */ #define ND_OPT_LEN_RTI_MIN 1 #define ND_OPT_LEN_RTI_MAX 3 #define ND_OPT_RTI_PFXLEN_MAX 128 /* * Receive Router Advertisement Message. * * Based on RFC 2461 * TODO: on-link bit on prefix information * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing */ void nd6_ra_input( struct mbuf *m, int off, int icmp6len) { struct ifnet *ifp = m->m_pkthdr.rcvif; 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; int mcast = 0; union nd_opts ndopts; 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; boolean_t rti_defrtr_processed = FALSE; #if (DEVELOPMENT || DEBUG) if (ip6_accept_rtadv == 0) { goto freeit; } #endif /* (DEVELOPMENT || DEBUG) */ /* Expect 32-bit aligned data pointer on strict-align platforms */ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); /* * Accept the RA if IFEF_ACCEPT_RTADV is set, or when * we're acting as a router and the RA is 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) == 0) { if (ifp->if_ipv6_router_mode == IPV6_ROUTER_MODE_EXCLUSIVE && (ia6 = ifa_foraddr6(&saddr6)) != NULL) { /* accept locally generated RA */ } else { goto freeit; } } if (ia6 != NULL) { ifa_remref(&ia6->ia_ifa); ia6 = NULL; } if (ip6->ip6_hlim != IPV6_MAXHLIM) { nd6log(error, "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), if_name(ifp)); goto bad; } if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { nd6log(error, "nd6_ra_input: src %s is not link-local\n", ip6_sprintf(&saddr6)); goto bad; } IP6_EXTHDR_CHECK(m, off, icmp6len, return ); ip6 = mtod(m, struct ip6_hdr *); nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); icmp6len -= sizeof(*nd_ra); nd6_option_init(nd_ra + 1, icmp6len, &ndopts); if (nd6_options(&ndopts) < 0) { nd6log(info, "nd6_ra_input: invalid ND option, ignored\n"); /* nd6_options have incremented stats */ goto freeit; } 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); /* unspecified or not? (RFC 2461 6.3.4) */ if (advreachable) { advreachable = ntohl(advreachable); if (advreachable <= MAX_REACHABLE_TIME && ndi->basereachable != advreachable) { ndi->basereachable = advreachable; ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */ } } if (nd_ra->nd_ra_retransmit) { ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); } 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(error, "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); /* Initialize nd_defrouter invariants for RA processing */ bzero(&dr0, sizeof(dr0)); dr0.rtaddr = saddr6; dr0.ifp = ifp; /* * Route Information Option */ if (ndopts.nd_opts_rti && IFNET_IS_ETHERNET(ifp)) { struct nd_opt_hdr *rt = NULL; struct sockaddr_in6 rti_gateway = {0}; rti_gateway.sin6_family = AF_INET6; rti_gateway.sin6_len = sizeof(rti_gateway); memcpy(&rti_gateway.sin6_addr, &saddr6, sizeof(rti_gateway.sin6_addr)); for (rt = (struct nd_opt_hdr *)ndopts.nd_opts_rti; rt <= (struct nd_opt_hdr *)ndopts.nd_opts_rti_end; rt = (struct nd_opt_hdr *)((caddr_t)rt + (rt->nd_opt_len << ND_OPT_LEN_TO_BYTE_SCALE))) { struct sockaddr_in6 rti_prefix = {}; struct nd_route_info rti = {}; struct nd_opt_route_info *rti_opt = NULL; u_int32_t rounded_prefix_bytes = 0; if (rt->nd_opt_type != ND_OPT_ROUTE_INFO) { continue; } rti_opt = (struct nd_opt_route_info *)rt; if ((rti_opt->nd_opt_rti_len < ND_OPT_LEN_RTI_MIN) || (rti_opt->nd_opt_rti_len > ND_OPT_LEN_RTI_MAX)) { nd6log(info, "%s: invalid option " "len %d for route information option, " "ignored\n", __func__, rti_opt->nd_opt_rti_len); continue; } if (rti_opt->nd_opt_rti_prefixlen > ND_OPT_RTI_PFXLEN_MAX) { nd6log(info, "%s: invalid prefix length %d " "in the route information option, " "ignored\n", __func__, rti_opt->nd_opt_rti_prefixlen); continue; } if (rti_opt->nd_opt_rti_prefixlen != 0 && rti_opt->nd_opt_rti_prefixlen <= 64 && rti_opt->nd_opt_rti_len == ND_OPT_LEN_RTI_MIN) { nd6log(info, "%s: invalid prefix " "len %d is OOB for route information option, " "with total option length of %d. Ignored.\n", __func__, rti_opt->nd_opt_rti_prefixlen, rti_opt->nd_opt_rti_len); continue; } if (rti_opt->nd_opt_rti_prefixlen > 64 && rti_opt->nd_opt_rti_len != ND_OPT_LEN_RTI_MAX) { nd6log(info, "%s: invalid prefix " "len %d is OOB for route information option, " "with total option length of %d. Ignored.\n", __func__, rti_opt->nd_opt_rti_prefixlen, rti_opt->nd_opt_rti_len); continue; } if ((rti_opt->nd_opt_rti_flags & ND_RA_FLAG_RTPREF_MASK) == ND_RA_FLAG_RTPREF_RSV) { nd6log(info, "%s: using reserved preference mask, " "ignored\n", __func__); continue; } rti_prefix.sin6_family = AF_INET6; rti_prefix.sin6_len = sizeof(rti_prefix); rounded_prefix_bytes = rti_opt->nd_opt_rti_prefixlen >> 3; if (rti_opt->nd_opt_rti_prefixlen & 0x7) { rounded_prefix_bytes++; } memcpy(&rti_prefix.sin6_addr, rti_opt + 1, rounded_prefix_bytes); nd6log(info, "%s: received RA with route opt, " "prefix %s/%u pref %u lifetime %u\n", __func__, ip6_sprintf(&rti_prefix.sin6_addr), rti_opt->nd_opt_rti_prefixlen, rti_opt->nd_opt_rti_flags, ntohl(rti_opt->nd_opt_rti_lifetime)); dr0.flags = rti_opt->nd_opt_rti_flags; dr0.stateflags = 0; /* * https://tools.ietf.org/html/rfc4191#section-3.1 * Type C Host requirements: * The Router Preference and Lifetime values in a * ::/0 Route Information Option override the * preference and lifetime values in the Router * Advertisement header. */ if (IN6_IS_ADDR_UNSPECIFIED(&rti_prefix.sin6_addr) && rti_opt->nd_opt_rti_prefixlen == 0) { rti_defrtr_processed = TRUE; /* * If the router lifetime is 0, set the state flag * to dummy, so that it is skipped and not used as a * default router. * Set the lifetime to 2 hrs to make sure we get rid * of the router eventually if this was indeed for a router * going away. * * We partly have to do this to ensure advertised prefixes * stay onlink. * A periodic RA would also keep refreshing the cached * neighbor cache entry if it contains source link layer * information. */ if (rti_opt->nd_opt_rti_lifetime == 0) { dr0.rtlifetime = TWOHOUR; dr0.stateflags |= NDDRF_INELIGIBLE; } else { dr0.rtlifetime = ntohl(rti_opt->nd_opt_rti_lifetime); } dr0.expire = net_uptime() + dr0.rtlifetime; lck_mtx_lock(nd6_mutex); dr = defrtrlist_update(&dr0, NULL); if (dr != NULL) { dr->is_reachable = TRUE; } lck_mtx_unlock(nd6_mutex); continue; } dr0.rtlifetime = ntohl(rti_opt->nd_opt_rti_lifetime); dr0.expire = net_uptime() + dr0.rtlifetime; bzero(&rti, sizeof(rti)); rti.nd_rti_prefixlen = rti_opt->nd_opt_rti_prefixlen; rti.nd_rti_prefix = rti_prefix.sin6_addr; nd6_rtilist_update(&rti, &dr0); } } if (!rti_defrtr_processed) { dr0.flags = nd_ra->nd_ra_flags_reserved; dr0.stateflags = 0; /* * If the router lifetime is 0, set the state flag * to dummy, so that it is skipped and not used as a * default router. * Set the lifetime to 2 hrs to make sure we get rid * of the router eventually if this was indeed for a router * going away. * * We partly have to do this to ensure advertised prefixes * stay onlink. * A periodic RA would also keep refreshing the cached * neighbor cache entry if it contains source link layer * information. */ if (nd_ra->nd_ra_router_lifetime == 0) { dr0.rtlifetime = TWOHOUR; dr0.stateflags |= NDDRF_INELIGIBLE; } else { dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); } dr0.expire = net_uptime() + dr0.rtlifetime; lck_mtx_lock(nd6_mutex); dr = defrtrlist_update(&dr0, NULL); if (dr != NULL) { dr->is_reachable = TRUE; } lck_mtx_unlock(nd6_mutex); } /* * prefix */ if (ndopts.nd_opts_pi) { struct nd_opt_hdr *pt; struct nd_opt_prefix_info *pi = NULL; 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 << ND_OPT_LEN_TO_BYTE_SCALE))) { 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; if (pi->nd_opt_pi_len != 4) { nd6log(info, "nd6_ra_input: invalid option " "len %d for prefix information option, " "ignored\n", pi->nd_opt_pi_len); continue; } if (128 < pi->nd_opt_pi_prefix_len) { nd6log(info, "nd6_ra_input: invalid prefix " "len %d for prefix information option, " "ignored\n", pi->nd_opt_pi_prefix_len); continue; } /* * 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(info, "%s: invalid prefix %s, ignored\n", __func__, ip6_sprintf(&pi->nd_opt_pi_prefix)); continue; } 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_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; pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 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); /* * 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(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(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 = kalloc_type(struct nd_prefix_list, Z_WAITOK | Z_ZERO | Z_NOFAIL); /* this is only for nd6_post_msg(), otherwise unused */ SOCKADDR_COPY(&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++; } } /* * MTU */ if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); /* lower bound */ if (mtu < IPV6_MMTU) { nd6log(info, "nd6_ra_input: bogus mtu option " "mtu=%d sent from %s, ignoring\n", mtu, ip6_sprintf(&ip6->ip6_src)); 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 { nd6log(info, "nd6_ra_input: bogus mtu " "mtu=%d sent from %s; " "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(info, "nd6_ra_input: mtu option " "mtu=%d sent from %s; maxmtu unknown, " "ignoring\n", mtu, ip6_sprintf(&ip6->ip6_src)); } } skip: /* * Source link layer address */ if (ndopts.nd_opts_src_lladdr) { lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; } if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { nd6log(info, "nd6_ra_input: lladdrlen mismatch for %s " "(if %d, RA packet %d)\n", ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2); goto bad; } if (dr && dr->stateflags & NDDRF_MAPPED) { saddr6 = dr->rtaddr_mapped; } nd6_cache_lladdr(ifp, &saddr6, lladdr, (int)lladdrlen, ND_ROUTER_ADVERT, 0, NULL); /* Post message */ nd6_post_msg(KEV_ND6_RA, nd_prefix_list_head, nd_prefix_list_length, mtu); /* * 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. */ lck_mtx_lock(nd6_mutex); pfxlist_onlink_check(); lck_mtx_unlock(nd6_mutex); freeit: m_freem(m); if (dr) { NDDR_REMREF(dr); } prfl = NULL; while ((prfl = nd_prefix_list_head) != NULL) { nd_prefix_list_head = prfl->next; kfree_type(struct nd_prefix_list, prfl); } return; bad: icmp6stat.icp6s_badra++; goto freeit; } /* * default router list proccessing sub routines */ /* tell the change to user processes watching the routing socket. */ static void nd6_rtmsg(u_char cmd, struct rtentry *rt) { struct rt_addrinfo info; struct ifnet *ifp = rt->rt_ifp; RT_LOCK_ASSERT_HELD(rt); 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); /* * 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); } static void defrouter_addreq(struct nd_defrouter *new, struct nd_route_info *rti, boolean_t scoped) { struct sockaddr_in6 key, mask, gate; struct rtentry *newrt __single = NULL; unsigned int ifscope; int err; struct nd_ifinfo *ndi = ND_IFINFO(new->ifp); int rtflags = RTF_GATEWAY; 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. */ NDDR_LOCK(new); if (new->stateflags & NDDRF_INSTALLED) { goto out; } if (new->ifp->if_ipv6_router_mode == IPV6_ROUTER_MODE_EXCLUSIVE) { nd6log2(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; } nd6log2(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(&key, sizeof(key)); Bzero(&mask, sizeof(mask)); Bzero(&gate, sizeof(gate)); key.sin6_len = mask.sin6_len = gate.sin6_len = sizeof(struct sockaddr_in6); key.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; if (rti != NULL) { key.sin6_addr = rti->nd_rti_prefix; in6_len2mask(&mask.sin6_addr, rti->nd_rti_prefixlen); if (rti->nd_rti_prefixlen == ND_OPT_RTI_PFXLEN_MAX) { rtflags |= RTF_HOST; } else { rtflags |= RTF_PRCLONING; } if (IN6_IS_SCOPE_EMBED(&key.sin6_addr) || IN6_IS_ADDR_LOOPBACK(&key.sin6_addr)) { nd6log2(info, "%s: ignoring router %s, rti prefix %s, scoped=%d, " "static=%d on advertising interface\n", if_name(new->ifp), ip6_sprintf(&new->rtaddr), ip6_sprintf(&rti->nd_rti_prefix), scoped, (new->stateflags & NDDRF_STATIC) ? 1 : 0); goto out; } } if (new->stateflags & NDDRF_MAPPED) { gate.sin6_addr = new->rtaddr_mapped; } else { gate.sin6_addr = new->rtaddr; } if (!in6_embedded_scope && IN6_IS_SCOPE_EMBED(&gate.sin6_addr)) { gate.sin6_scope_id = new->ifp->if_index; } ifscope = scoped ? new->ifp->if_index : IFSCOPE_NONE; NDDR_UNLOCK(new); /* * 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 (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(info, "%s: Default router %s mapped " "to ", if_name(new->ifp), ip6_sprintf(&new->rtaddr)); nd6log(info, "%s\n", ip6_sprintf(&new->rtaddr_mapped)); } } err = rtrequest_scoped(RTM_ADD, SA(&key), SA(&gate), SA(&mask), rtflags, &newrt, ifscope); 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 { nd6log(error, "%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); } new->err = err; out: NDDR_UNLOCK(new); } void defrouter_set_reachability( struct in6_addr *addr, struct ifnet *ifp, boolean_t is_reachable) { struct nd_defrouter *dr = NULL; LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED); lck_mtx_lock(nd6_mutex); dr = defrouter_lookup(NULL, addr, ifp); if (dr != NULL) { dr->is_reachable = is_reachable; NDDR_REMREF(dr); } lck_mtx_unlock(nd6_mutex); } struct nd_defrouter * defrouter_lookup( struct nd_drhead *nd_router_listp, struct in6_addr *addr, struct ifnet *ifp) { struct nd_defrouter *dr; LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED); if (nd_router_listp == NULL) { nd_router_listp = &nd_defrouter_list; } for (dr = TAILQ_FIRST(nd_router_listp); dr; dr = TAILQ_NEXT(dr, dr_entry)) { NDDR_LOCK(dr); if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) { NDDR_ADDREF(dr); NDDR_UNLOCK(dr); return dr; } NDDR_UNLOCK(dr); } return NULL; /* search failed */ } /* * 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 nd_route_info *rti) { struct sockaddr_in6 key, mask, gate; struct rtentry *oldrt __single = NULL; unsigned int ifscope; int err; 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(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(&key, sizeof(key)); Bzero(&mask, sizeof(mask)); Bzero(&gate, sizeof(gate)); key.sin6_len = mask.sin6_len = gate.sin6_len = sizeof(struct sockaddr_in6); key.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; if (rti != NULL) { key.sin6_addr = rti->nd_rti_prefix; in6_len2mask(&mask.sin6_addr, rti->nd_rti_prefixlen); } /* * 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, SA(&key), SA(&gate), SA(&mask), RTF_GATEWAY, &oldrt, ifscope); if (oldrt) { RT_LOCK(oldrt); nd6_rtmsg(RTM_DELETE, oldrt); RT_UNLOCK(oldrt); rtfree(oldrt); } else if (err != ESRCH) { nd6log(error, "%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_list); while (dr) { NDDR_LOCK(dr); if (dr->stateflags & NDDRF_INSTALLED) { NDDR_ADDREF(dr); NDDR_UNLOCK(dr); lck_mtx_unlock(nd6_mutex); defrouter_delreq(dr, NULL); lck_mtx_lock(nd6_mutex); NDDR_REMREF(dr); dr = TAILQ_FIRST(&nd_defrouter_list); } 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, NULL); 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; OS_FALLTHROUGH; 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_IN_RANGE(ifindex) || (dr_ifp = ifindex2ifnet[ifindex]) == NULL) { ifnet_head_done(); error = EINVAL; break; } dr0.ifp = dr_ifp; ifnet_head_done(); if (ND_IFINFO(dr_ifp) == NULL || !ND_IFINFO(dr_ifp)->initialized) { error = ENXIO; break; } if (IN6_IS_SCOPE_EMBED(&dr0.rtaddr) && in6_embedded_scope) { 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; } 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, struct nd_drhead *nd_router_listp) { #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 = FALSE; struct nd_route_info *rti = NULL; LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED); if (nd_router_listp == NULL) { nd_router_listp = &nd_defrouter_list; } if (nd_router_listp != &nd_defrouter_list) { rti = (struct nd_route_info *)nd_router_listp; } #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_router_listp, dr_entry) VERIFY(dr != dr_itr); #endif ++nd6_defrouter_genid; /* * Flush all the routing table entries that use the router * as a next hop. * * XXX Note that for a router advertising itself as default router * and also advertising route information option, the following * code will have the default router entry and router entry of * RTI step over each other. * The following therefore may not be efficient but won't be * causing blocking issues. */ 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); } lck_mtx_lock(nd6_mutex); NDDR_REMREF(dr); nd6log2(info, "%s: freeing route to %s with gateway %s\n", if_name(dr->ifp), (rti == NULL)? "::" : ip6_sprintf(&rti->nd_rti_prefix), ip6_sprintf(&dr->rtaddr)); /* * Delete it from the routing table. */ NDDR_ADDREF(dr); lck_mtx_unlock(nd6_mutex); defrouter_delreq(dr, rti); lck_mtx_lock(nd6_mutex); NDDR_REMREF(dr); /* * The following should mostly be limited to when we are working * with a default router entry and not a router entry from * rti router list. */ if (rti == NULL) { /* * 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, pr); } NDPR_UNLOCK(pr); } pfxlist_onlink_check(); } 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; } lck_mtx_unlock(&ndi->lock); /* * If the router is the primary one, choose a new one. * We always try to pick another eligible router * on this interface as we do scoped routing */ defrouter_select(ifp, nd_router_listp); 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(NULL, &new->rtaddr, new->ifp); if (dr != NULL && !(dr->stateflags & NDDRF_STATIC)) { err = EINVAL; } else { if (dr != NULL) { NDDR_REMREF(dr); } dr = defrtrlist_update(new, NULL); 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(NULL, &new->rtaddr, new->ifp); if (dr == NULL || !(dr->stateflags & NDDRF_STATIC)) { if (dr != NULL) { NDDR_REMREF(dr); } dr = NULL; } else { TAILQ_REMOVE(&nd_defrouter_list, dr, dr_entry); defrtrlist_del(dr, NULL); NDDR_REMREF(dr); /* remove list reference */ NDDR_REMREF(dr); } lck_mtx_unlock(nd6_mutex); return dr != NULL ? 0 : EINVAL; } /* * 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 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, 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(struct ifnet *ifp, struct nd_drhead *nd_router_listp) { 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; struct nd_route_info *rti = NULL; boolean_t scoped = TRUE; boolean_t is_rti_rtrlist = FALSE; LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED); if (nd_router_listp == NULL) { nd_router_listp = &nd_defrouter_list; } if (nd_router_listp != &nd_defrouter_list) { rti = (struct nd_route_info *)nd_router_listp; /* XXX For now we treat RTI routes as un-scoped */ scoped = FALSE; is_rti_rtrlist = TRUE; } if (ifp == NULL) { ifp = nd6_defifp; if (ifp == NULL) { nd6log2(info, "%s:%d: Return early. NULL interface", __func__, __LINE__); return; } nd6log2(info, "%s:%d: NULL interface passed. Setting to default interface %s.\n", __func__, __LINE__, if_name(ifp)); } /* * When we are working with RTI router list, the nd6_defifp may be * NULL. That is the scenario when the network may not have WAN * v6 connectivity and the only RAs we may be getting are with lifetime * 0. */ if (ifp == lo_ifp && !is_rti_rtrlist) { nd6log2(info, "%s:%d: Return early. " "Default router select called for loopback.\n", __func__, __LINE__); return; } if (ifp->if_ipv6_router_mode == IPV6_ROUTER_MODE_EXCLUSIVE) { nd6log2(info, "%s:%d: Return early. " "Default router select called for interface" " %s in IPV6_ROUTER_MODE_EXCLUSIVE\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_router_listp)) { nd6log2(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(info, "%s:%d: Return early. " "Interface %s's nd_ifinfo not initialized.\n", __func__, __LINE__, if_name(ifp)); return; } /* * RTI router list routes are installed as unscoped. * Since there can be only one unscoped route, we need to * go through the entire list and consider all interfaces. * Further, for now, RTI option is only processed on Ethernet * type interfaces only. */ if (ndi->ndefrouters == 0 && !is_rti_rtrlist) { nd6log2(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_router_listp); while (dr != NULL) { struct in6_addr rtaddr; struct ifnet *drifp = NULL; struct nd_defrouter *drrele = NULL; boolean_t nd6_mutex_unlocked = FALSE; NDDR_LOCK(dr); drifp = dr->ifp; if (drifp != ifp && !is_rti_rtrlist) { NDDR_UNLOCK(dr); dr = TAILQ_NEXT(dr, dr_entry); continue; } if (dr->stateflags & NDDRF_INELIGIBLE) { NDDR_UNLOCK(dr); dr = TAILQ_NEXT(dr, dr_entry); nd6log(info, "Ignoring dummy entry for default router."); 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 && !is_rti_rtrlist) { nd6log2(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(selected_dr); NDDR_UNLOCK(dr); goto install_route; } if (dr->stateflags & NDDRF_MAPPED) { rtaddr = dr->rtaddr_mapped; } else { rtaddr = dr->rtaddr; } NDDR_ADDREF(dr); /* for this for loop */ NDDR_UNLOCK(dr); /* Callee returns a locked route upon success */ if (selected_dr == NULL) { nd6_mutex_unlocked = TRUE; 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); } } if (rt) { RT_REMREF_LOCKED(rt); RT_UNLOCK(rt); rt = NULL; } if (nd6_mutex_unlocked) { lck_mtx_lock(nd6_mutex); } /* * 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(selected_dr); } /* Record the currently installed router */ if (dr->stateflags & NDDRF_INSTALLED) { if (installed_dr == NULL) { installed_dr = dr; NDDR_ADDREF(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, installed_dr->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(error, "defrouter_select: more than one " "default router is installed for interface :%s.\n", if_name(installed_dr->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 && !is_rti_rtrlist) { nd6log2(info, "%s:%d: Interface %s no longer " "has any default routers. Abort.\n", __func__, __LINE__, if_name(ifp)); goto out; } nd6log2(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_router_listp); } 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 && !is_rti_rtrlist) { continue; } if (dr->stateflags & NDDRF_INELIGIBLE) { continue; } selected_dr = dr; break; } } /* * If none was installed or the installed one if the last * one on the list, select the first one from the list */ if ((installed_dr == NULL) || (selected_dr == NULL)) { for (dr = TAILQ_FIRST(nd_router_listp); dr; dr = TAILQ_NEXT(dr, dr_entry)) { if (dr->stateflags & NDDRF_INELIGIBLE) { continue; } if (dr->ifp == ifp || is_rti_rtrlist) { selected_dr = dr; break; } } } if ((selected_dr == NULL) && (installed_dr == NULL)) { nd6log2(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) { /* * 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. */ 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); } } 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(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, rti); } /* * Install scoped route if the interface is not * the default nd6 interface. */ defrouter_addreq(selected_dr, rti, scoped && (selected_dr->ifp != nd6_defifp)); } else if (((installed_dr->stateflags & NDDRF_IFSCOPE) && (installed_dr->ifp == nd6_defifp)) || (scoped && !(installed_dr->stateflags & NDDRF_IFSCOPE) && (installed_dr->ifp != nd6_defifp))) { nd6log(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, rti); defrouter_addreq(installed_dr, rti, scoped && (installed_dr->ifp != nd6_defifp)); } else { nd6log2(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_common(struct nd_defrouter *new, struct nd_drhead *nd_router_listp, boolean_t scoped) { struct nd_defrouter *dr, *n; struct ifnet *ifp = new->ifp; struct nd_ifinfo *ndi = NULL; struct timeval caltime; LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED); if (nd_router_listp == NULL) { nd_router_listp = &nd_defrouter_list; } /* * If we are not operating on default router list, * it implies we are operating on RTI's router list. * XXX For now we manage RTI routes un-scoped. */ if (nd_router_listp != &nd_defrouter_list) { scoped = FALSE; } if ((dr = defrouter_lookup(nd_router_listp, &new->rtaddr, ifp)) != NULL) { /* entry exists */ /* * 1. If previous entry was not dummy and new is, * delete it and return NULL. * 2. If previous entry was dummy and the new one * is also dummy, simply return dr. * 3. If previous was dummy but new one is not, * make sure we perform default router selection again. */ /* If the router was not added as a dummy and there's * been a change (lifetime advertised was 0, communicated * as NDDRF_INELIGIBLE flag), remove the entry. */ if ((new->stateflags & NDDRF_INELIGIBLE) != 0 && (dr->stateflags & NDDRF_INELIGIBLE) == 0) { TAILQ_REMOVE(nd_router_listp, dr, dr_entry); defrtrlist_del(dr, nd_router_listp); NDDR_REMREF(dr); /* remove list reference */ NDDR_REMREF(dr); dr = NULL; return NULL; } else { int oldpref = rtpref(dr); struct nd_defrouter *p = NULL; boolean_t dummy_change = FALSE; /* * If new one is not dummy but the old one was, * reset the stateflag. */ if ((new->stateflags & NDDRF_INELIGIBLE) == 0 && (dr->stateflags & NDDRF_INELIGIBLE) != 0) { dummy_change = TRUE; dr->stateflags &= ~NDDRF_INELIGIBLE; } /* 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 && dummy_change == FALSE) { return dr; } n = TAILQ_FIRST(nd_router_listp); 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)) && dummy_change == FALSE) { 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_router_listp, dr, dr_entry); new->stateflags = dr->stateflags; n = dr; goto insert; } } VERIFY(dr == NULL); n = nddr_alloc(Z_WAITOK); 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); nd6log(error, "%s: ignoring router addition as we have hit the " "max limit of %d for max default routers.\n", __func__, ip6_maxifdefrouters); 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(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; n->is_reachable = TRUE; NDDR_UNLOCK(n); insert: /* get nd6_service() to be scheduled as soon as it's convenient */ ++nd6_sched_timeout_want; /* * 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. */ /* insert at the end of the group */ for (dr = TAILQ_FIRST(nd_router_listp); 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_router_listp, n, dr_entry); } defrouter_select(ifp, nd_router_listp); return n; } struct nd_defrouter * defrtrlist_update(struct nd_defrouter *new, struct nd_drhead *nd_router_list) { struct nd_defrouter *dr; LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED); dr = defrtrlist_update_common(new, nd_router_list, (nd6_defifp != NULL && new->ifp != nd6_defifp)); return dr; } struct nd_pfxrouter * pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr) { struct nd_pfxrouter *search; LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED); NDPR_LOCK_ASSERT_HELD(pr); for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { if (search->router == dr) { break; } } return search; } static void 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 = zalloc_flags(ndprtr_zone, Z_WAITOK | Z_ZERO | Z_NOFAIL); new->router = dr; NDPR_LOCK(pr); LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); pr->ndpr_genid++; NDPR_UNLOCK(pr); pfxlist_onlink_check(); } static void 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); 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, 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, pr->ndpr_prefix.sin6_scope_id, &search->ndpr_prefix.sin6_addr, search->ndpr_prefix.sin6_scope_id, pr->ndpr_plen)) { if (nd6_prefix_expiry != ND6_PREFIX_EXPIRY_UNSPEC) { search->ndpr_expire = nd6_prefix_expiry; } NDPR_ADDREF(search); NDPR_UNLOCK(search); break; } NDPR_UNLOCK(search); } lck_mtx_unlock(nd6_mutex); return search; } int nd6_prelist_add(struct nd_prefix *pr, struct nd_defrouter *dr, struct nd_prefix **newp, boolean_t force_scoped) { struct nd_prefix *new = NULL; struct ifnet *ifp = pr->ndpr_ifp; struct nd_ifinfo *ndi = NULL; int i, error; 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; } 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; NDPR_ADDREF(new); /* for caller */ } /* initialization */ LIST_INIT(&new->ndpr_advrtrs); in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); /* make prefix in the canonical form */ for (i = 0; i < 4; i++) { new->ndpr_prefix.sin6_addr.s6_addr32[i] &= new->ndpr_mask.s6_addr32[i]; } 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 */ 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_common(new, force_scoped, new->ndpr_ifp->if_index)) != 0) { nd6log(error, "nd6_prelist_add: failed to make " "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? */ } } if (dr) { pfxrtr_add(new, dr); } lck_mtx_unlock(nd6_mutex); return 0; } /* * Caller must have held an extra reference on nd_prefix. */ void prelist_remove(struct nd_prefix *pr) { struct nd_pfxrouter *pfr = NULL, *next = NULL; struct ifnet *ifp = pr->ndpr_ifp; struct nd_ifinfo *ndi = NULL; struct nd_prefix *tmp_pr = NULL; boolean_t pr_scoped; int err; LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED); NDPR_LOCK_ASSERT_HELD(pr); if (pr->ndpr_stateflags & NDPRF_DEFUNCT) { return; } pr_scoped = (pr->ndpr_stateflags & NDPRF_IFSCOPE) != 0; /* * 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; /* * Though these flags are now meaningless, we'd rather keep the value * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users * when executing "ndp -p". */ if (pr->ndpr_stateflags & NDPRF_ONLINK) { int error = 0; NDPR_ADDREF(pr); NDPR_UNLOCK(pr); lck_mtx_unlock(nd6_mutex); if ((error = nd6_prefix_offlink(pr)) != 0) { nd6log(error, "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), error); /* what should we do? */ } lck_mtx_lock(nd6_mutex); NDPR_LOCK(pr); if (NDPR_REMREF(pr) == NULL) { return; } } /* * Check if there is a scoped version of this PR, if so * make it unscoped. */ if (!pr_scoped && IN6_IS_ADDR_UNIQUE_LOCAL(&pr->ndpr_prefix.sin6_addr)) { tmp_pr = nd6_prefix_equal_lookup(pr, FALSE); if (tmp_pr != NULL) { NDPR_ADDREF(pr); NDPR_UNLOCK(pr); lck_mtx_unlock(nd6_mutex); err = nd6_prefix_offlink(tmp_pr); lck_mtx_lock(nd6_mutex); if (err != 0) { nd6log(error, "%s: failed to make %s/%d offlink on %s, " "errno=%d\n", __func__, ip6_sprintf(&tmp_pr->ndpr_prefix.sin6_addr), tmp_pr->ndpr_plen, if_name(tmp_pr->ndpr_ifp), err); } err = nd6_prefix_onlink_scoped(tmp_pr, IFSCOPE_NONE); if (err != 0) { nd6log(error, "%s: failed to make %s/%d onlink on %s, errno=%d\n", __func__, ip6_sprintf(&tmp_pr->ndpr_prefix.sin6_addr), tmp_pr->ndpr_plen, if_name(tmp_pr->ndpr_ifp), err); } if (err != 0) { nd6log(error, "%s: error unscoping %s/%d from %s\n", __func__, ip6_sprintf(&tmp_pr->ndpr_prefix.sin6_addr), tmp_pr->ndpr_plen, if_name(tmp_pr->ndpr_ifp)); } else { nd6log2(info, "%s: %s/%d unscoped, previously on %s\n", __func__, ip6_sprintf(&tmp_pr->ndpr_prefix.sin6_addr), tmp_pr->ndpr_plen, if_name(tmp_pr->ndpr_ifp)); } NDPR_REMREF(tmp_pr); NDPR_LOCK(pr); if (NDPR_REMREF(pr) == NULL) { return; } } } 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; pfxrtr_del(pfr, pr); } 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); /* This must not be the last reference to the nd_prefix */ if (NDPR_REMREF(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, int mcast) { struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; struct ifaddr *ifa; struct ifnet *ifp = new->ndpr_ifp; struct nd_prefix *pr; int error = 0; int newprefix = 0; int auth; 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) { /* * Authenticity for NA consists authentication for * 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); #endif } 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. */ /* * Update prefix information. Note that the on-link (L) bit * 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) { pr->ndpr_raf_auto = 1; } if (new->ndpr_raf_onlink) { pr->ndpr_vltime = new->ndpr_vltime; pr->ndpr_pltime = new->ndpr_pltime; (void) in6_init_prefix_ltimes(pr); /* XXX error case? */ pr->ndpr_lastupdate = net_uptime(); } NDPR_ADDREF(pr); if (new->ndpr_raf_onlink && (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { int e; NDPR_UNLOCK(pr); if ((e = nd6_prefix_onlink(pr)) != 0) { nd6log(error, "prelist_update: 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); /* proceed anyway. XXX: is it correct? */ } NDPR_LOCK(pr); } 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 { newprefix = 1; if (new->ndpr_vltime == 0) { goto end; } if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) { goto end; } bzero(&new->ndpr_addr, sizeof(struct in6_addr)); error = nd6_prelist_add(new, dr, &pr, FALSE); if (error != 0 || pr == NULL) { nd6log(info, "prelist_update: " "nd6_prelist_add failed for %s/%d on %s " "errno=%d, returnpr=0x%llx\n", ip6_sprintf(&new->ndpr_prefix.sin6_addr), 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. */ } } /* * 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 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. */ if (new->ndpr_pltime > new->ndpr_vltime) { error = EINVAL; /* XXX: won't be used */ goto end; } /* * 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. */ ifnet_lock_shared(ifp); TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { struct in6_ifaddr *ifa6 = NULL; u_int32_t remaininglifetime = 0; struct in6_addrlifetime lt6_tmp = {}; 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) { IFA_UNLOCK(ifa); continue; } /* * 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 */ ia6_match = ifa6; ifa_addref(ifa); /* for ia6_match */ } /* * An already autoconfigured address matched. Now that we * are sure there is at least one matched address, we can * proceed to 5.5.3. (e): update the lifetimes according to the * "two hours" rule and the privacy extension. */ /* 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 - (uint32_t)(timenow - ifa6->ia6_updatetime); } /* when not updating, keep the current stored lifetime. */ lt6_tmp.ia6t_vltime = remaininglifetime; if (TWOHOUR < new->ndpr_vltime || remaininglifetime < new->ndpr_vltime) { lt6_tmp.ia6t_vltime = new->ndpr_vltime; } else if (remaininglifetime <= TWOHOUR) { if (auth) { lt6_tmp.ia6t_vltime = new->ndpr_vltime; } } else { /* * new->ndpr_vltime <= TWOHOUR && * TWOHOUR < remaininglifetime */ lt6_tmp.ia6t_vltime = TWOHOUR; } /* The 2 hour rule is not imposed for preferred lifetime. */ lt6_tmp.ia6t_pltime = new->ndpr_pltime; /* Special handling for lifetimes of temporary addresses. */ if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 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 - (uint32_t)((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 - (uint32_t)((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; } } in6_init_address_ltimes(<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_pfx_newpersistaddr(new, mcast, &error, FALSE, 0)) != NULL) { /* * note that we should use pr (not new) for reference. */ IFA_LOCK(&ia6->ia_ifa); NDPR_LOCK(pr); ia6->ia6_ndpr = pr; NDPR_ADDREF(pr); /* for addr reference */ pr->ndpr_addrcnt++; VERIFY(pr->ndpr_addrcnt != 0); NDPR_UNLOCK(pr); IFA_UNLOCK(&ia6->ia_ifa); /* * RFC 4941 3.3 (2). * When a new public address is created as described * in RFC 4862, also create a new temporary address. * * 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 * addresses. Thus, we specifiy 1 as the 2nd arg of * in6_tmpifadd(). */ if (ip6_use_tempaddr && (!IN6_IS_ADDR_UNIQUE_LOCAL(&new->ndpr_prefix.sin6_addr) || ip6_ula_use_tempaddr)) { int e; if ((e = in6_tmpifadd(ia6, 1)) != 0) { nd6log(info, "prelist_update: " "failed to create a temporary " "address, errno=%d\n", e); } } ifa_remref(&ia6->ia_ifa); ia6 = NULL; /* * If the interface is marked for CLAT46 configuration * try and configure the reserved IPv6 address for * stateless translation. */ if (IS_INTF_CLAT46(ifp)) { if ((ia6 = in6_pfx_newpersistaddr(new, mcast, &error, TRUE, CLAT46_COLLISION_COUNT_OFFSET)) != NULL) { IFA_LOCK(&ia6->ia_ifa); NDPR_LOCK(pr); ia6->ia6_ndpr = pr; NDPR_ADDREF(pr); /* for addr reference */ pr->ndpr_addrcnt++; VERIFY(pr->ndpr_addrcnt != 0); pr->ndpr_stateflags |= NDPRF_CLAT46; NDPR_UNLOCK(pr); IFA_UNLOCK(&ia6->ia_ifa); ifa_remref(&ia6->ia_ifa); ia6 = NULL; } else if (error != EEXIST) { uuid_t tmp_uuid = {}; /* * Only report the error if it is not * EEXIST. */ ip6stat.ip6s_clat464_v6addr_conffail++; in6_clat46_event_enqueue_nwk_wq_entry( IN6_CLAT46_EVENT_V6_ADDR_CONFFAIL, 0, tmp_uuid); nd6log0(error, "Could not configure CLAT46 address on interface %s.\n", ifp->if_xname); } /* * Reset the error as we do not want to * treat failure of CLAT46 address configuration * as complete failure in prelist update path. */ error = 0; } /* * A newly added address might affect the status * of other addresses, so we check and update it. * XXX: what if address duplication happens? */ lck_mtx_lock(nd6_mutex); pfxlist_onlink_check(); lck_mtx_unlock(nd6_mutex); } } end: if (pr != NULL) { 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(zalloc_flags_t how) { struct nd_defrouter *dr; dr = zalloc_flags(nddr_zone, how | Z_ZERO); if (dr) { lck_mtx_init(&dr->nddr_lock, &ifa_mtx_grp, &ifa_mtx_attr); lck_mtx_init(&dr->nddr_ref_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) { 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; lck_mtx_destroy(&dr->nddr_lock, &ifa_mtx_grp); lck_mtx_destroy(&dr->nddr_ref_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 = os_atomic_inc_orig(cnt, relaxed) % NDDR_TRACE_HIST_SIZE; ctrace_record(&tr[idx]); } void nddr_addref(struct nd_defrouter *nddr) { NDDR_REF_LOCK_SPIN(nddr); if (++nddr->nddr_refcount == 0) { panic("%s: nddr %p wraparound refcnt", __func__, nddr); /* NOTREACHED */ } else if (nddr->nddr_trace != NULL) { (*nddr->nddr_trace)(nddr, TRUE); } NDDR_REF_UNLOCK(nddr); } struct nd_defrouter * nddr_remref(struct nd_defrouter *nddr) { NDDR_REF_LOCK_SPIN(nddr); if (nddr->nddr_refcount == 0) { panic("%s: nddr %p negative refcnt", __func__, nddr); /* NOTREACHED */ } else if (nddr->nddr_trace != NULL) { (*nddr->nddr_trace)(nddr, FALSE); } if (--nddr->nddr_refcount == 0) { NDDR_REF_UNLOCK(nddr); nddr_free(nddr); nddr = NULL; } else { NDDR_REF_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); 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 = zalloc_flags(ndpr_zone, how | Z_ZERO); if (pr != NULL) { lck_mtx_init(&pr->ndpr_lock, &ifa_mtx_grp, &ifa_mtx_attr); lck_mtx_init(&pr->ndpr_ref_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) { 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; lck_mtx_destroy(&pr->ndpr_lock, &ifa_mtx_grp); lck_mtx_destroy(&pr->ndpr_ref_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 = os_atomic_inc_orig(cnt, relaxed) % NDPR_TRACE_HIST_SIZE; ctrace_record(&tr[idx]); } void ndpr_addref(struct nd_prefix *ndpr) { NDPR_REF_LOCK_SPIN(ndpr); if (++ndpr->ndpr_refcount == 0) { panic("%s: ndpr %p wraparound refcnt", __func__, ndpr); /* NOTREACHED */ } else if (ndpr->ndpr_trace != NULL) { (*ndpr->ndpr_trace)(ndpr, TRUE); } NDPR_REF_UNLOCK(ndpr); } struct nd_prefix * ndpr_remref(struct nd_prefix *ndpr) { NDPR_REF_LOCK_SPIN(ndpr); if (ndpr->ndpr_refcount == 0) { panic("%s: ndpr %p negative refcnt", __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_REF_UNLOCK(ndpr); ndpr_free(ndpr); ndpr = NULL; } else { NDPR_REF_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... */ static struct nd_pfxrouter * find_pfxlist_reachable_router(struct nd_prefix *pr) { struct nd_pfxrouter *pfxrtr = NULL; struct ifnet *ifp = NULL; LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED); NDPR_LOCK_ASSERT_HELD(pr); pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); while (pfxrtr) { /* XXX This should be same as prefixes interface. */ ifp = pfxrtr->router->ifp; /* * As long as there's a router advertisting this prefix * on cellular (for that matter any interface that is point * to point really), we treat the router as reachable. */ if (ifp != NULL && ifp->if_type == IFT_CELLULAR) { break; } if (pfxrtr->router->is_reachable) { break; } pfxrtr = LIST_NEXT(pfxrtr, pfr_entry); } return pfxrtr; } /* * Check if each prefix in the prefix list has at least one available router * that advertised the prefix (a router is "available" if its neighbor cache * entry is reachable or probably reachable). * If the check fails, the prefix may be off-link, because, for example, * we have moved from the network but the lifetime of the prefix has not * expired yet. So we should not use the prefix if there is another prefix * that has an available router. * But, if there is no prefix that has an available router, we still regards * all the prefixes as on-link. This is because we can't tell if all the * routers are simply dead or if we really moved from the network and there * is no router around us. */ void pfxlist_onlink_check(void) { 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; u_int64_t timenow = net_uptime(); 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. */ pr = nd_prefix.lh_first; while (pr) { NDPR_LOCK(pr); if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr) && (pr->ndpr_debug & IFD_ATTACHED)) { NDPR_UNLOCK(pr); break; } NDPR_UNLOCK(pr); pr = pr->ndpr_next; } /* * 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_list); 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_list) && pfxrtr == NULL)) { /* * 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. */ pr = nd_prefix.lh_first; while (pr) { NDPR_LOCK(pr); /* * 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 || pr->ndpr_stateflags & NDPRF_STATIC) { NDPR_UNLOCK(pr); pr = pr->ndpr_next; continue; } if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 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) != NULL && (pr->ndpr_debug & IFD_ATTACHED)) { pr->ndpr_stateflags &= ~NDPRF_DETACHED; } NDPR_UNLOCK(pr); pr = pr->ndpr_next; } } else { /* there is no prefix that has a reachable router */ for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 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); } } /* * Instead of removing interface route for detached prefix, * keep the route and treat unreachability similar to the processing * of an RA that has just deprecated the prefix. * Keep around the detached flag just to be able to be able * to differentiate the scenario from explicit RA deprecation * of prefix. * Keep the logic to install the interface route for a (just) attached * prefix. Note that all attempt of reinstallation does not * necessarily success, when a same prefix is shared among multiple * interfaces. Such cases will be handled in nd6_prefix_onlink, * so we don't have to care about them. */ pr = nd_prefix.lh_first; while (pr) { int error; 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; } pr->ndpr_stateflags |= NDPRF_PROCESSED_ONLINK; NDPR_ADDREF(pr); if (pr->ndpr_stateflags & NDPRF_DETACHED) { /* * When a prefix is detached, make it deprecated by setting pltime * to 0, and let it expire according to its advertised vltime. * If its original vltime is infinite or longer than 2hr, * set it to 2hr. */ pr->ndpr_pltime = 0; uint32_t pr_remaining_lifetime; uint32_t original_lifetime = (uint32_t)(timenow - pr->ndpr_base_uptime); if (pr->ndpr_vltime > original_lifetime) { pr_remaining_lifetime = pr->ndpr_vltime - original_lifetime; } else { pr_remaining_lifetime = 0; } if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME || pr_remaining_lifetime >= TWOHOUR) { pr->ndpr_vltime = TWOHOUR; } else { pr->ndpr_vltime = pr_remaining_lifetime; } in6_init_prefix_ltimes(pr); NDPR_UNLOCK(pr); } else if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 && pr->ndpr_raf_onlink) { NDPR_UNLOCK(pr); if ((error = nd6_prefix_onlink(pr)) != 0) { nd6log(error, "pfxlist_onlink_check: failed to " "make %s/%d offlink, errno=%d\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, error); } 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); } /* * Changes on the prefix status might affect address status as well. * Make sure that all addresses derived from an attached prefix are * attached, and that all addresses derived from a detached prefix are * 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. */ err = ifnet_get_address_list_family_internal(NULL, &ifap, AF_INET6, 0, M_NOWAIT, 0); if (err != 0 || ifap == NULL) { nd6log(error, "%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 ((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); NDPR_LOCK(ndpr); if (find_pfxlist_reachable_router(ndpr)) { NDPR_UNLOCK(ndpr); found = 1; break; } NDPR_UNLOCK(ndpr); } if (found) { for (i = 0; ifap[i]; i++) { struct in6_addrlifetime lt6_tmp = {}; 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 ((ndpr = ifa->ia6_ndpr) == NULL) { /* XXX: see above. */ IFA_UNLOCK(&ifa->ia_ifa); continue; } IFA_UNLOCK(&ifa->ia_ifa); NDPR_LOCK(ndpr); if (find_pfxlist_reachable_router(ndpr) == NULL) { /* * When the prefix of an addr is detached, make the address * deprecated by setting pltime to 0, and let it expire according * to its advertised vltime. If its original vltime is infinite * or longer than 2hr, set it to 2hr. */ NDPR_UNLOCK(ndpr); IFA_LOCK(&ifa->ia_ifa); in6ifa_getlifetime(ifa, <6_tmp, 0); /* We want to immediately deprecate the address */ lt6_tmp.ia6t_pltime = 0; /* Do not extend its valid lifetime */ uint32_t remaining_lifetime; uint32_t original_lifetime = (uint32_t)(timenow - ifa->ia6_updatetime); if (lt6_tmp.ia6t_vltime > original_lifetime) { remaining_lifetime = lt6_tmp.ia6t_vltime - original_lifetime; } else { remaining_lifetime = 0; } if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME || remaining_lifetime >= TWOHOUR) { lt6_tmp.ia6t_vltime = TWOHOUR; } else { lt6_tmp.ia6t_vltime = remaining_lifetime; } in6_init_address_ltimes(<6_tmp); in6ifa_setlifetime(ifa, <6_tmp); ifa->ia6_updatetime = timenow; /* * The next nd6 service timer expiry will take * care of marking the addresses as deprecated * and issuing the notifications as well. */ IFA_UNLOCK(&ifa->ia_ifa); } else { NDPR_UNLOCK(ndpr); } } } 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, pr->ndpr_prefix.sin6_scope_id, &opr->ndpr_prefix.sin6_addr, opr->ndpr_prefix.sin6_scope_id, pr->ndpr_plen) && (!primary_only || !(opr->ndpr_stateflags & NDPRF_IFSCOPE))) { NDPR_ADDREF(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; } 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 (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(error, "%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(error, "%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(error, "%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(error, "%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(error, "%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(error, "%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(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); } } 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, prefix; struct nd_prefix *opr; u_int32_t rtflags; int error = 0, prproxy = 0; struct rtentry *rt __single = NULL; u_char prefix_len = 0; LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED); /* sanity check */ NDPR_LOCK(pr); if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { nd6log(error, "%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. */ opr = nd6_prefix_equal_lookup(pr, FALSE); if (opr != NULL) { NDPR_REMREF(opr); } 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; } } /* * 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); if (ifa == NULL) { 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 * containing a prefix with the L bit set and the A bit clear, * after removing all IPv6 addresses on the receiving * interface. This should, of course, be rare though. */ nd6log(info, "nd6_prefix_onlink: failed to find any ifaddr" " to add route for a prefix(%s/%d) on %s\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(ifp)); NDPR_UNLOCK(pr); return 0; } /* * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. * ifa->ifa_rtrequest = nd6_rtrequest; */ SOCKADDR_ZERO(&mask6, sizeof(mask6)); mask6.sin6_len = sizeof(mask6); mask6.sin6_addr = pr->ndpr_mask; prefix = pr->ndpr_prefix; prefix_len = pr->ndpr_plen; if ((rt = pr->ndpr_rt) != NULL) { pr->ndpr_rt = NULL; } NDPR_ADDREF(pr); /* keep reference for this routine */ NDPR_UNLOCK(pr); 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; } else { /* * explicitly clear the cloning bit in case ifa_flags sets it. */ rtflags &= ~RTF_CLONING; } lck_mtx_unlock(nd6_mutex); /* * check if it conflicts with a indirect prefix route added by RIO * if so, remove the rti entry. */ if (ifscope == IFSCOPE_NONE) { struct rtentry *temp_route = NULL; LCK_MTX_ASSERT(rnh_lock, LCK_MTX_ASSERT_NOTOWNED); lck_mtx_lock(rnh_lock); temp_route = rt_lookup(TRUE, SA(&prefix), SA(&mask6), rt_tables[AF_INET6], IFSCOPE_NONE); lck_mtx_unlock(rnh_lock); if (temp_route != NULL && temp_route->rt_flags & RTF_GATEWAY && temp_route->rt_ifp != NULL) { struct nd_route_info rti = {}; bzero(&rti, sizeof(rti)); rti.nd_rti_prefixlen = prefix_len; rti.nd_rti_prefix = prefix.sin6_addr; lck_mtx_lock(nd6_mutex); nd6_rti_purge(&rti); lck_mtx_unlock(nd6_mutex); } if (temp_route != NULL) { rtfree(temp_route); } } if (rt != NULL) { rtfree(rt); rt = NULL; } error = rtrequest_scoped(RTM_ADD, SA(&prefix), ifa->ifa_addr, SA(&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(error, "nd6_prefix_onlink: failed to add route for a" " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%x," " scoped=%d, errno = %d\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(ifp), ip6_sprintf(&SIN6(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); lck_mtx_lock(nd6_mutex); return error; } int nd6_prefix_onlink(struct nd_prefix *pr) { 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 sockaddr_in6 sa6, mask6, prefix; struct rtentry *rt __single = 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(error, "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; } SOCKADDR_ZERO(&sa6, sizeof(sa6)); sa6.sin6_family = AF_INET6; sa6.sin6_len = sizeof(sa6); bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, sizeof(struct in6_addr)); SOCKADDR_ZERO(&mask6, sizeof(mask6)); mask6.sin6_family = AF_INET6; 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(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, SA(&sa6), NULL, SA(&mask6), 0, &rt, ifscope); if (rt != NULL) { /* report the route deletion to the routing socket. */ RT_LOCK(rt); nd6_rtmsg(RTM_DELETE, rt); RT_UNLOCK(rt); rtfree(rt); } else { nd6log(error, "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); } if (ndpr_rt != NULL) { rtfree(ndpr_rt); } lck_mtx_lock(&proxy6_lock); 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 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); NDPR_REMREF(pr); /* release reference for this routine */ lck_mtx_unlock(&proxy6_lock); return error; } struct in6_ifaddr * in6_pfx_newpersistaddr(struct nd_prefix *pr, int mcast, int *errorp, boolean_t is_clat46, uint8_t collision_count) { struct in6_ifaddr *ia6 = NULL; struct ifnet *ifp = NULL; struct nd_ifinfo *ndi = NULL; struct in6_addr mask; struct in6_aliasreq ifra; int error, ifaupdate, iidlen, notcga; VERIFY(pr != NULL); VERIFY(errorp != NULL); NDPR_LOCK(pr); ifp = pr->ndpr_ifp; ia6 = NULL; error = 0; /* * 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. */ 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(info, "%s: IID length not 64 octets (%s)\n", __func__, if_name(ifp)); goto unlock1; } if (iidlen + pr->ndpr_plen != 128) { error = EADDRNOTAVAIL; nd6log(info, "%s: invalid prefix length %d for %s, ignored\n", __func__, pr->ndpr_plen, if_name(ifp)); goto unlock1; } 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); /* prefix */ bcopy(&pr->ndpr_prefix.sin6_addr, &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]; 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 && !is_clat46) { ia6 = in6ifa_ifpforlinklocal(ifp, 0); if (ia6 == NULL) { error = EADDRNOTAVAIL; nd6log(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 { struct in6_cga_prepare local_cga_prepare; struct in6_cga_prepare *prepare_p; in6_cga_node_lock(); if (ndi->cga_initialized) { bcopy(&(ndi->local_cga_modifier), &(local_cga_prepare.cga_modifier), sizeof(local_cga_prepare.cga_modifier)); prepare_p = &local_cga_prepare; } else { prepare_p = NULL; } error = in6_cga_generate(prepare_p, collision_count, &ifra.ifra_addr.sin6_addr, ifp); in6_cga_node_unlock(); if (error == 0) { ifra.ifra_flags |= IN6_IFF_SECURED; if (is_clat46) { ifra.ifra_flags |= IN6_IFF_CLAT46; } } else { if (!is_clat46) { nd6log(error, "%s: no CGA available (%s)\n", __func__, if_name(ifp)); } else { nd6log(error, "%s: no CLAT46 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_family = AF_INET6; bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, sizeof(ifra.ifra_prefixmask.sin6_addr)); /* lifetimes. */ ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; /* address flags */ ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ /* * 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. */ if ((ia6 = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr)) != NULL) { error = EEXIST; 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; } /* * 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] */ ifaupdate = IN6_IFAUPDATE_NOWAIT; if (mcast) { ifaupdate |= IN6_IFAUPDATE_DADDELAY; } error = in6_update_ifa(ifp, &ifra, ifaupdate, &ia6); if (error != 0) { nd6log(error, "%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; } else { /* remember the collision count */ ia6->ia6_cga_collision_count = collision_count; } VERIFY(ia6 != NULL); in6_post_msg(ifp, KEV_INET6_NEW_RTADV_ADDR, ia6, NULL); goto done; unlock1: NDPR_UNLOCK(pr); done: *errorp = error; return ia6; } #define IA6_NONCONST(i) ((struct in6_ifaddr *)(uintptr_t)(i)) int in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen) { struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; struct in6_ifaddr *ia, *newia; struct in6_aliasreq ifra; int i, error, ifaupdate; int trylimit = 3; /* XXX: adhoc value */ u_int32_t randid[2]; uint32_t vltime0, pltime0; uint64_t timenow = net_uptime(); struct in6_addr addr; struct nd_prefix *ndpr; 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; /* clear the old IFID */ for (i = 0; i < 4; i++) { 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_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])); /* * 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 ((ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr)) != NULL) { ifa_remref(&ia->ia_ifa); if (trylimit-- == 0) { nd6log(info, "in6_tmpifadd: failed to find " "a unique random IFID\n"); return EEXIST; } forcegen = 1; goto again; } /* * The Valid Lifetime is the lower of the Valid Lifetime of the * 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. */ 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 - (uint32_t)(timenow - ia0->ia6_updatetime)); if (vltime0 > ip6_temp_valid_lifetime) { vltime0 = ip6_temp_valid_lifetime; } } else { vltime0 = ip6_temp_valid_lifetime; } if (ia0->ia6_lifetime.ia6ti_pltime != ND6_INFINITE_LIFETIME) { pltime0 = IFA6_IS_DEPRECATED(ia0, timenow) ? 0 : (ia0->ia6_lifetime.ia6ti_pltime - (uint32_t)(timenow - ia0->ia6_updatetime)); if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor) { pltime0 = ip6_temp_preferred_lifetime - 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; } /* XXX: scope zone ID? */ ifra.ifra_flags |= (IN6_IFF_AUTOCONF | IN6_IFF_TEMPORARY); /* allocate ifaddr structure, link into chain, etc. */ ifaupdate = IN6_IFAUPDATE_NOWAIT | IN6_IFAUPDATE_DADDELAY; error = in6_update_ifa(ifp, &ifra, ifaupdate, &newia); if (error != 0) { nd6log(error, "in6_tmpifadd: failed to add address.\n"); return error; } 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(error, "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(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 * address, the onlink check is redundant. However, it would be safe * to do the check explicitly everywhere a new address is generated, * and, in fact, we surely need the check when we create a new * temporary address due to deprecation of an old temporary address. */ lck_mtx_lock(nd6_mutex); pfxlist_onlink_check(); lck_mtx_unlock(nd6_mutex); ifa_remref(&newia->ia_ifa); /* remove our reference */ NDPR_REMREF(ndpr); return 0; } #undef IA6_NONCONST int in6_init_prefix_ltimes(struct nd_prefix *ndpr) { 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; /* check if preferred lifetime > valid lifetime. RFC 4862 5.5.3 (c) */ if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { nd6log(info, "in6_init_prefix_ltimes: preferred lifetime" "(%d) is greater than valid lifetime(%d)\n", (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime); return EINVAL; } if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) { ndpr->ndpr_preferred = 0; } else { ndpr->ndpr_preferred = timenow + ndpr->ndpr_pltime; } if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) { ndpr->ndpr_expire = 0; } else { ndpr->ndpr_expire = timenow + ndpr->ndpr_vltime; } return 0; } static void in6_init_address_ltimes(struct in6_addrlifetime *lt6) { uint64_t timenow = net_uptime(); /* Valid lifetime must not be updated unless explicitly specified. */ /* init ia6t_expire */ if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) { lt6->ia6t_expire = 0; } else { lt6->ia6t_expire = timenow; lt6->ia6t_expire += lt6->ia6t_vltime; } /* init ia6t_preferred */ if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) { lt6->ia6t_preferred = 0; } else { lt6->ia6t_preferred = timenow; lt6->ia6t_preferred += lt6->ia6t_pltime; } } /* * Delete all the routing table entries that use the specified gateway. * XXX: this function causes search through all entries of routing table, so * it shouldn't be called when acting as a router. * * This should really be working on entries that have a specific * parent route. */ void rt6_flush( struct in6_addr *gateway, struct ifnet *ifp) { struct radix_node_head *rnh = rt_tables[AF_INET6]; /* We'll care only link-local addresses */ if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { return; } lck_mtx_lock(rnh_lock); /* XXX: hack for KAME's link-local address kludge */ if (in6_embedded_scope) { gateway->s6_addr16[1] = htons(ifp->if_index); } rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); lck_mtx_unlock(rnh_lock); } static int rt6_deleteroute( struct radix_node *rn, void *arg) { struct rtentry *rt = (struct rtentry *)rn; struct in6_addr *gate = (struct in6_addr *)arg; LCK_MTX_ASSERT(rnh_lock, LCK_MTX_ASSERT_OWNED); 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) { 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) { RT_UNLOCK(rt); return 0; } /* * 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 nd6_setdefaultiface( int ifindex) { int error = 0; ifnet_t def_ifp = NULL; LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED); ifnet_head_lock_shared(); if (!IF_INDEX_IN_RANGE(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 = def_ifp; } else { nd6_defifp = NULL; } if (nd6_defifp != NULL) { nd6log(info, "%s: is now the default " "interface (was %s)\n", if_name(nd6_defifp), odef_ifp != NULL ? if_name(odef_ifp) : "NONE"); } else { nd6log(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 * route when the default interface becomes canceled. * The check for the queue is actually redundant, but * we do this here to avoid re-install the default route * if the list is NOT empty. */ if (odef_ifp != NULL) { defrouter_select(odef_ifp, NULL); } if (nd6_defifp != NULL) { defrouter_select(nd6_defifp, NULL); nd6_prefix_sync(nd6_defifp); } /* * XXX For now we managed RTI routes as un-scoped. * Therefore we ignore the change in nd6_defifindex * for RTI routes for now. */ /* * 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; }