nd6_rtr.c revision 281230
1109655Speter/*- 281404Speter * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3109655Speter * All rights reserved. 4109655Speter * 5109655Speter * Redistribution and use in source and binary forms, with or without 6109655Speter * modification, are permitted provided that the following conditions 7109655Speter * are met: 8109655Speter * 1. Redistributions of source code must retain the above copyright 9109655Speter * notice, this list of conditions and the following disclaimer. 10109655Speter * 2. Redistributions in binary form must reproduce the above copyright 11109655Speter * notice, this list of conditions and the following disclaimer in the 12109655Speter * documentation and/or other materials provided with the distribution. 13109655Speter * 3. Neither the name of the project nor the names of its contributors 14109655Speter * may be used to endorse or promote products derived from this software 15107484Speter * without specific prior written permission. 16107484Speter * 17107484Speter * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18109655Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19109655Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20109655Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21107484Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22107484Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23107484Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24107484Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25107484Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26107484Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27107484Speter * SUCH DAMAGE. 28107484Speter * 29107484Speter * $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ 30107484Speter */ 31107484Speter 32107484Speter#include <sys/cdefs.h> 33107484Speter__FBSDID("$FreeBSD: stable/10/sys/netinet6/nd6_rtr.c 281230 2015-04-07 20:20:24Z delphij $"); 34107484Speter 35107484Speter#include "opt_inet.h" 36107484Speter#include "opt_inet6.h" 37107484Speter 38107484Speter#include <sys/param.h> 39107484Speter#include <sys/systm.h> 40107484Speter#include <sys/malloc.h> 41107484Speter#include <sys/mbuf.h> 42102840Speter#include <sys/socket.h> 43102840Speter#include <sys/sockio.h> 44102840Speter#include <sys/time.h> 45102840Speter#include <sys/kernel.h> 46102840Speter#include <sys/lock.h> 47102840Speter#include <sys/errno.h> 48102840Speter#include <sys/rwlock.h> 49102840Speter#include <sys/syslog.h> 50102840Speter#include <sys/queue.h> 51102840Speter 52102840Speter#include <net/if.h> 53102840Speter#include <net/if_types.h> 54102840Speter#include <net/if_dl.h> 55102840Speter#include <net/route.h> 56102840Speter#include <net/radix.h> 57102840Speter#include <net/vnet.h> 58102840Speter 59102840Speter#include <netinet/in.h> 60102840Speter#include <net/if_llatbl.h> 6181404Speter#include <netinet6/in6_var.h> 6281404Speter#include <netinet6/in6_ifattach.h> 63102840Speter#include <netinet/ip6.h> 6481404Speter#include <netinet6/ip6_var.h> 65102840Speter#include <netinet6/nd6.h> 66102840Speter#include <netinet/icmp6.h> 67102840Speter#include <netinet6/scope6_var.h> 6881404Speter 69102840Speterstatic int rtpref(struct nd_defrouter *); 70102840Speterstatic struct nd_defrouter *defrtrlist_update(struct nd_defrouter *); 71102840Speterstatic int prelist_update(struct nd_prefixctl *, struct nd_defrouter *, 72102840Speter struct mbuf *, int); 73102840Speterstatic struct in6_ifaddr *in6_ifadd(struct nd_prefixctl *, int); 74102840Speterstatic struct nd_pfxrouter *pfxrtr_lookup(struct nd_prefix *, 75102840Speter struct nd_defrouter *); 76102840Speterstatic void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *); 77102840Speterstatic void pfxrtr_del(struct nd_pfxrouter *); 78102840Speterstatic struct nd_pfxrouter *find_pfxlist_reachable_router 79102840Speter(struct nd_prefix *); 80102840Speterstatic void defrouter_delreq(struct nd_defrouter *); 81102840Speterstatic void nd6_rtmsg(int, struct rtentry *); 82102840Speter 8381404Speterstatic int in6_init_prefix_ltimes(struct nd_prefix *); 8481404Speterstatic void in6_init_address_ltimes(struct nd_prefix *, 8581404Speter struct in6_addrlifetime *); 86102840Speter 87102840Speterstatic int nd6_prefix_onlink(struct nd_prefix *); 88102840Speterstatic int nd6_prefix_offlink(struct nd_prefix *); 8981404Speter 9081404Speterstatic int rt6_deleteroute(struct radix_node *, void *); 9181404Speter 9281404SpeterVNET_DECLARE(int, nd6_recalc_reachtm_interval); 9381404Speter#define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval) 9481404Speter 95102840Speterstatic VNET_DEFINE(struct ifnet *, nd6_defifp); 96102840SpeterVNET_DEFINE(int, nd6_defifindex); 97102840Speter#define V_nd6_defifp VNET(nd6_defifp) 98102840Speter 99102840SpeterVNET_DEFINE(int, ip6_use_tempaddr) = 0; 100102840Speter 101102840SpeterVNET_DEFINE(int, ip6_desync_factor); 102102840SpeterVNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME; 103102840SpeterVNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME; 10481404Speter 105102840SpeterVNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE; 106102840Speter 10781404Speter/* RTPREF_MEDIUM has to be 0! */ 10881404Speter#define RTPREF_HIGH 1 10981404Speter#define RTPREF_MEDIUM 0 110102840Speter#define RTPREF_LOW (-1) 111102840Speter#define RTPREF_RESERVED (-2) 112102840Speter#define RTPREF_INVALID (-3) /* internal */ 113102840Speter 11481404Speter/* 115102840Speter * Receive Router Solicitation Message - just for routers. 116102840Speter * Router solicitation/advertisement is mostly managed by userland program 117102840Speter * (rtadvd) so here we have no function like nd6_ra_output(). 118102840Speter * 119102840Speter * Based on RFC 2461 12081404Speter */ 121102840Spetervoid 12217721Speternd6_rs_input(struct mbuf *m, int off, int icmp6len) 123102840Speter{ 124102840Speter struct ifnet *ifp = m->m_pkthdr.rcvif; 125102840Speter struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 12666525Speter struct nd_router_solicit *nd_rs; 12766525Speter struct in6_addr saddr6 = ip6->ip6_src; 12866525Speter char *lladdr = NULL; 12966525Speter int lladdrlen = 0; 13066525Speter union nd_opts ndopts; 13166525Speter char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 13266525Speter 13366525Speter /* 13466525Speter * Accept RS only when V_ip6_forwarding=1 and the interface has 13566525Speter * no ND6_IFF_ACCEPT_RTADV. 13666525Speter */ 13766525Speter if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) 13866525Speter goto freeit; 13966525Speter 14066525Speter /* Sanity checks */ 14166525Speter if (ip6->ip6_hlim != 255) { 14266525Speter nd6log((LOG_ERR, 14366525Speter "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n", 14466525Speter ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 14554427Speter ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 14654427Speter goto bad; 14754427Speter } 14854427Speter 14954427Speter /* 15054427Speter * Don't update the neighbor cache, if src = ::. 15154427Speter * This indicates that the src has no IP address assigned yet. 15254427Speter */ 15354427Speter if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 15454427Speter goto freeit; 15554427Speter 15654427Speter#ifndef PULLDOWN_TEST 15754427Speter IP6_EXTHDR_CHECK(m, off, icmp6len,); 15854427Speter nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); 15954427Speter#else 16054427Speter IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len); 16154427Speter if (nd_rs == NULL) { 16254427Speter ICMP6STAT_INC(icp6s_tooshort); 16354427Speter return; 16454427Speter } 16554427Speter#endif 16654427Speter 16754427Speter icmp6len -= sizeof(*nd_rs); 168102840Speter nd6_option_init(nd_rs + 1, icmp6len, &ndopts); 169102840Speter if (nd6_options(&ndopts) < 0) { 170102840Speter nd6log((LOG_INFO, 171102840Speter "nd6_rs_input: invalid ND option, ignored\n")); 172102840Speter /* nd6_options have incremented stats */ 17344852Speter goto freeit; 17444852Speter } 17544852Speter 17644852Speter if (ndopts.nd_opts_src_lladdr) { 17744852Speter lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 17844852Speter lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 17944852Speter } 18044852Speter 18144852Speter if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 18244852Speter nd6log((LOG_INFO, 18344852Speter "nd6_rs_input: lladdrlen mismatch for %s " 18432785Speter "(if %d, RS packet %d)\n", 18544852Speter ip6_sprintf(ip6bufs, &saddr6), 18644852Speter ifp->if_addrlen, lladdrlen - 2)); 18732785Speter goto bad; 18832785Speter } 18932785Speter 19032785Speter nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 19132785Speter 19232785Speter freeit: 19332785Speter m_freem(m); 19432785Speter return; 19532785Speter 19632785Speter bad: 19732785Speter ICMP6STAT_INC(icp6s_badrs); 19832785Speter m_freem(m); 19932785Speter} 20032785Speter 20132785Speter/* 20232785Speter * Receive Router Advertisement Message. 20332785Speter * 20432785Speter * Based on RFC 2461 20532785Speter * TODO: on-link bit on prefix information 20632785Speter * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 20732785Speter */ 20832785Spetervoid 20926801Speternd6_ra_input(struct mbuf *m, int off, int icmp6len) 21026801Speter{ 21126801Speter struct ifnet *ifp = m->m_pkthdr.rcvif; 21226801Speter struct nd_ifinfo *ndi = ND_IFINFO(ifp); 21326801Speter struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 21426801Speter struct nd_router_advert *nd_ra; 21525839Speter struct in6_addr saddr6 = ip6->ip6_src; 21625839Speter int mcast = 0; 21725839Speter union nd_opts ndopts; 21825839Speter struct nd_defrouter *dr; 21925839Speter char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 22025839Speter 22125839Speter /* 22225839Speter * We only accept RAs only when the per-interface flag 22325839Speter * ND6_IFF_ACCEPT_RTADV is on the receiving interface. 22425839Speter */ 22525839Speter if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV)) 22625839Speter goto freeit; 22725839Speter 22825839Speter if (ip6->ip6_hlim != 255) { 22925839Speter nd6log((LOG_ERR, 23032785Speter "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", 23132785Speter ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 23232785Speter ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 23325839Speter goto bad; 23425839Speter } 23525839Speter 23625839Speter if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 23725839Speter nd6log((LOG_ERR, 23825839Speter "nd6_ra_input: src %s is not link-local\n", 23925839Speter ip6_sprintf(ip6bufs, &saddr6))); 24025839Speter goto bad; 24125839Speter } 24225839Speter 24325839Speter#ifndef PULLDOWN_TEST 24425839Speter IP6_EXTHDR_CHECK(m, off, icmp6len,); 24525839Speter nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 24625839Speter#else 24725839Speter IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 24825839Speter if (nd_ra == NULL) { 24925839Speter ICMP6STAT_INC(icp6s_tooshort); 25025839Speter return; 25125839Speter } 25225839Speter#endif 25325839Speter 25425839Speter icmp6len -= sizeof(*nd_ra); 25525839Speter nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 25625839Speter if (nd6_options(&ndopts) < 0) { 25725839Speter nd6log((LOG_INFO, 25825839Speter "nd6_ra_input: invalid ND option, ignored\n")); 25925839Speter /* nd6_options have incremented stats */ 26025839Speter goto freeit; 26125839Speter } 26225839Speter 26325839Speter { 26425839Speter struct nd_defrouter dr0; 26525839Speter u_int32_t advreachable = nd_ra->nd_ra_reachable; 26625839Speter 26725839Speter /* remember if this is a multicasted advertisement */ 26825839Speter if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 26925839Speter mcast = 1; 27025839Speter 27125839Speter bzero(&dr0, sizeof(dr0)); 27225839Speter dr0.rtaddr = saddr6; 27325839Speter dr0.flags = nd_ra->nd_ra_flags_reserved; 27425839Speter /* 27525839Speter * Effectively-disable routes from RA messages when 27625839Speter * ND6_IFF_NO_RADR enabled on the receiving interface or 27725839Speter * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1). 27825839Speter */ 27925839Speter if (ndi->flags & ND6_IFF_NO_RADR) 28025839Speter dr0.rtlifetime = 0; 28125839Speter else if (V_ip6_forwarding && !V_ip6_rfc6204w3) 28225839Speter dr0.rtlifetime = 0; 28325839Speter else 28425839Speter dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 28525839Speter dr0.expire = time_uptime + dr0.rtlifetime; 28625839Speter dr0.ifp = ifp; 28725839Speter /* unspecified or not? (RFC 2461 6.3.4) */ 28825839Speter if (advreachable) { 28925839Speter advreachable = ntohl(advreachable); 29025839Speter if (advreachable <= MAX_REACHABLE_TIME && 29125839Speter ndi->basereachable != advreachable) { 29225839Speter ndi->basereachable = advreachable; 29325839Speter ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 29425839Speter ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */ 29525839Speter } 29625839Speter } 29725839Speter if (nd_ra->nd_ra_retransmit) 29825839Speter ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 29925839Speter if (nd_ra->nd_ra_curhoplimit) { 30025839Speter if (ndi->chlim < nd_ra->nd_ra_curhoplimit) 30125839Speter ndi->chlim = nd_ra->nd_ra_curhoplimit; 30225839Speter else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) { 30325839Speter log(LOG_ERR, "RA with a lower CurHopLimit sent from " 30425839Speter "%s on %s (current = %d, received = %d). " 30525839Speter "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src), 30625839Speter if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit); 30725839Speter } 30825839Speter } 30925839Speter dr = defrtrlist_update(&dr0); 31025839Speter } 31125839Speter 31225839Speter /* 31325839Speter * prefix 31425839Speter */ 31525839Speter if (ndopts.nd_opts_pi) { 31625839Speter struct nd_opt_hdr *pt; 31725839Speter struct nd_opt_prefix_info *pi = NULL; 31825839Speter struct nd_prefixctl pr; 31925839Speter 32025839Speter for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 32125839Speter pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 32225839Speter pt = (struct nd_opt_hdr *)((caddr_t)pt + 32325839Speter (pt->nd_opt_len << 3))) { 32425839Speter if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 32525839Speter continue; 32625839Speter pi = (struct nd_opt_prefix_info *)pt; 32725839Speter 32825839Speter if (pi->nd_opt_pi_len != 4) { 32925839Speter nd6log((LOG_INFO, 33025839Speter "nd6_ra_input: invalid option " 33125839Speter "len %d for prefix information option, " 33225839Speter "ignored\n", pi->nd_opt_pi_len)); 33325839Speter continue; 33425839Speter } 33525839Speter 33625839Speter if (128 < pi->nd_opt_pi_prefix_len) { 33725839Speter nd6log((LOG_INFO, 33825839Speter "nd6_ra_input: invalid prefix " 33925839Speter "len %d for prefix information option, " 34025839Speter "ignored\n", pi->nd_opt_pi_prefix_len)); 34117721Speter continue; 34217721Speter } 34317721Speter 34417721Speter if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 34517721Speter || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 34617721Speter nd6log((LOG_INFO, 34717721Speter "nd6_ra_input: invalid prefix " 34817721Speter "%s, ignored\n", 34917721Speter ip6_sprintf(ip6bufs, 35017721Speter &pi->nd_opt_pi_prefix))); 35117721Speter continue; 35217721Speter } 35317721Speter 35417721Speter bzero(&pr, sizeof(pr)); 35517721Speter pr.ndpr_prefix.sin6_family = AF_INET6; 35617721Speter pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 35717721Speter pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 35817721Speter pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 35917721Speter 36017721Speter pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 36117721Speter ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 36217721Speter pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 36317721Speter ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 36417721Speter pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 36517721Speter pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 36617721Speter pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time); 36717721Speter (void)prelist_update(&pr, dr, m, mcast); 36817721Speter } 36917721Speter } 37017721Speter 37117721Speter /* 37217721Speter * MTU 37317721Speter */ 37417721Speter if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 37517721Speter u_long mtu; 37617721Speter u_long maxmtu; 37717721Speter 37817721Speter mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 37917721Speter 38017721Speter /* lower bound */ 38117721Speter if (mtu < IPV6_MMTU) { 38217721Speter nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " 38317721Speter "mtu=%lu sent from %s, ignoring\n", 38417721Speter mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src))); 38517721Speter goto skip; 38617721Speter } 38717721Speter 38817721Speter /* upper bound */ 38917721Speter maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu) 39017721Speter ? ndi->maxmtu : ifp->if_mtu; 39117721Speter if (mtu <= maxmtu) { 39217721Speter int change = (ndi->linkmtu != mtu); 39317721Speter 39417721Speter ndi->linkmtu = mtu; 39517721Speter if (change) /* in6_maxmtu may change */ 39617721Speter in6_setmaxmtu(); 39717721Speter } else { 39817721Speter nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " 39917721Speter "mtu=%lu sent from %s; " 40017721Speter "exceeds maxmtu %lu, ignoring\n", 40117721Speter mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu)); 40217721Speter } 40317721Speter } 40417721Speter 40517721Speter skip: 40617721Speter 40717721Speter /* 40817721Speter * Source link layer address 40917721Speter */ 41017721Speter { 41117721Speter char *lladdr = NULL; 41217721Speter int lladdrlen = 0; 41317721Speter 41417721Speter if (ndopts.nd_opts_src_lladdr) { 41517721Speter lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 41617721Speter lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 41717721Speter } 41817721Speter 41917721Speter if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 42017721Speter nd6log((LOG_INFO, 42117721Speter "nd6_ra_input: lladdrlen mismatch for %s " 42217721Speter "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6), 42317721Speter ifp->if_addrlen, lladdrlen - 2)); 42417721Speter goto bad; 42517721Speter } 42617721Speter 42717721Speter nd6_cache_lladdr(ifp, &saddr6, lladdr, 42817721Speter lladdrlen, ND_ROUTER_ADVERT, 0); 42917721Speter 43017721Speter /* 43117721Speter * Installing a link-layer address might change the state of the 43217721Speter * router's neighbor cache, which might also affect our on-link 43317721Speter * detection of adveritsed prefixes. 43417721Speter */ 43517721Speter pfxlist_onlink_check(); 43617721Speter } 43717721Speter 43817721Speter freeit: 43917721Speter m_freem(m); 44017721Speter return; 44117721Speter 44217721Speter bad: 44317721Speter ICMP6STAT_INC(icp6s_badra); 44417721Speter m_freem(m); 44517721Speter} 44617721Speter 44717721Speter/* 44817721Speter * default router list proccessing sub routines 44917721Speter */ 45017721Speter 45117721Speter/* tell the change to user processes watching the routing socket. */ 45217721Speterstatic void 45317721Speternd6_rtmsg(int cmd, struct rtentry *rt) 45417721Speter{ 45517721Speter struct rt_addrinfo info; 45617721Speter struct ifnet *ifp; 45717721Speter struct ifaddr *ifa; 45817721Speter 45917721Speter bzero((caddr_t)&info, sizeof(info)); 46017721Speter info.rti_info[RTAX_DST] = rt_key(rt); 46117721Speter info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 46217721Speter info.rti_info[RTAX_NETMASK] = rt_mask(rt); 46317721Speter ifp = rt->rt_ifp; 46417721Speter if (ifp != NULL) { 46517721Speter IF_ADDR_RLOCK(ifp); 46617721Speter ifa = TAILQ_FIRST(&ifp->if_addrhead); 46717721Speter info.rti_info[RTAX_IFP] = ifa->ifa_addr; 46817721Speter ifa_ref(ifa); 46917721Speter IF_ADDR_RUNLOCK(ifp); 47017721Speter info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 47117721Speter } else 47217721Speter ifa = NULL; 47317721Speter 47417721Speter rt_missmsg_fib(cmd, &info, rt->rt_flags, 0, rt->rt_fibnum); 47517721Speter if (ifa != NULL) 47617721Speter ifa_free(ifa); 47717721Speter} 47817721Speter 47917721Speterstatic void 48017721Speterdefrouter_addreq(struct nd_defrouter *new) 48117721Speter{ 48217721Speter struct sockaddr_in6 def, mask, gate; 48317721Speter struct rtentry *newrt = NULL; 48417721Speter int error; 48517721Speter 48617721Speter bzero(&def, sizeof(def)); 48717721Speter bzero(&mask, sizeof(mask)); 48817721Speter bzero(&gate, sizeof(gate)); 48917721Speter 49017721Speter def.sin6_len = mask.sin6_len = gate.sin6_len = 49117721Speter sizeof(struct sockaddr_in6); 49217721Speter def.sin6_family = gate.sin6_family = AF_INET6; 49317721Speter gate.sin6_addr = new->rtaddr; 49417721Speter 49517721Speter error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def, 49617721Speter (struct sockaddr *)&gate, (struct sockaddr *)&mask, 49717721Speter RTF_GATEWAY, &newrt, RT_DEFAULT_FIB); 49817721Speter if (newrt) { 49917721Speter nd6_rtmsg(RTM_ADD, newrt); /* tell user process */ 50017721Speter RTFREE(newrt); 50117721Speter } 50217721Speter if (error == 0) 50317721Speter new->installed = 1; 50417721Speter return; 50517721Speter} 50617721Speter 50717721Speterstruct nd_defrouter * 50817721Speterdefrouter_lookup(struct in6_addr *addr, struct ifnet *ifp) 50917721Speter{ 51017721Speter struct nd_defrouter *dr; 51117721Speter 51217721Speter TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) { 51317721Speter if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 51417721Speter return (dr); 51517721Speter } 51617721Speter 51717721Speter return (NULL); /* search failed */ 51817721Speter} 51917721Speter 52017721Speter/* 52117721Speter * Remove the default route for a given router. 52217721Speter * This is just a subroutine function for defrouter_select(), and should 52317721Speter * not be called from anywhere else. 52417721Speter */ 52517721Speterstatic void 52617721Speterdefrouter_delreq(struct nd_defrouter *dr) 52717721Speter{ 52817721Speter struct sockaddr_in6 def, mask, gate; 52917721Speter struct rtentry *oldrt = NULL; 53017721Speter 53117721Speter bzero(&def, sizeof(def)); 53217721Speter bzero(&mask, sizeof(mask)); 53317721Speter bzero(&gate, sizeof(gate)); 53417721Speter 53517721Speter def.sin6_len = mask.sin6_len = gate.sin6_len = 53617721Speter sizeof(struct sockaddr_in6); 53717721Speter def.sin6_family = gate.sin6_family = AF_INET6; 53817721Speter gate.sin6_addr = dr->rtaddr; 53917721Speter 54017721Speter in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def, 54117721Speter (struct sockaddr *)&gate, 54217721Speter (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, RT_DEFAULT_FIB); 54317721Speter if (oldrt) { 54417721Speter nd6_rtmsg(RTM_DELETE, oldrt); 54517721Speter RTFREE(oldrt); 54617721Speter } 54717721Speter 54817721Speter dr->installed = 0; 54917721Speter} 55017721Speter 55117721Speter/* 55217721Speter * remove all default routes from default router list 55317721Speter */ 55417721Spetervoid 55517721Speterdefrouter_reset(void) 55617721Speter{ 55717721Speter struct nd_defrouter *dr; 55817721Speter 55917721Speter TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) 56017721Speter defrouter_delreq(dr); 56117721Speter 56217721Speter /* 56317721Speter * XXX should we also nuke any default routers in the kernel, by 56417721Speter * going through them by rtalloc1()? 56517721Speter */ 56617721Speter} 56717721Speter 56817721Spetervoid 56917721Speterdefrtrlist_del(struct nd_defrouter *dr) 57017721Speter{ 57117721Speter struct nd_defrouter *deldr = NULL; 57217721Speter struct nd_prefix *pr; 57317721Speter 57417721Speter /* 57517721Speter * Flush all the routing table entries that use the router 57617721Speter * as a next hop. 57717721Speter */ 57817721Speter if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV) 57917721Speter rt6_flush(&dr->rtaddr, dr->ifp); 58017721Speter 58117721Speter if (dr->installed) { 58217721Speter deldr = dr; 58317721Speter defrouter_delreq(dr); 58417721Speter } 58517721Speter TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry); 58617721Speter 58717721Speter /* 58817721Speter * Also delete all the pointers to the router in each prefix lists. 58917721Speter */ 59017721Speter LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 59117721Speter struct nd_pfxrouter *pfxrtr; 59217721Speter if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 59317721Speter pfxrtr_del(pfxrtr); 59417721Speter } 59517721Speter pfxlist_onlink_check(); 59617721Speter 59717721Speter /* 59817721Speter * If the router is the primary one, choose a new one. 59917721Speter * Note that defrouter_select() will remove the current gateway 60017721Speter * from the routing table. 60117721Speter */ 60217721Speter if (deldr) 60317721Speter defrouter_select(); 60417721Speter 60517721Speter free(dr, M_IP6NDP); 60617721Speter} 60717721Speter 60817721Speter/* 60917721Speter * Default Router Selection according to Section 6.3.6 of RFC 2461 and 61017721Speter * draft-ietf-ipngwg-router-selection: 61117721Speter * 1) Routers that are reachable or probably reachable should be preferred. 61217721Speter * If we have more than one (probably) reachable router, prefer ones 61317721Speter * with the highest router preference. 61417721Speter * 2) When no routers on the list are known to be reachable or 61517721Speter * probably reachable, routers SHOULD be selected in a round-robin 61617721Speter * fashion, regardless of router preference values. 61717721Speter * 3) If the Default Router List is empty, assume that all 61817721Speter * destinations are on-link. 61917721Speter * 62017721Speter * We assume nd_defrouter is sorted by router preference value. 62117721Speter * Since the code below covers both with and without router preference cases, 62217721Speter * we do not need to classify the cases by ifdef. 62317721Speter * 62417721Speter * At this moment, we do not try to install more than one default router, 62517721Speter * even when the multipath routing is available, because we're not sure about 62617721Speter * the benefits for stub hosts comparing to the risk of making the code 62717721Speter * complicated and the possibility of introducing bugs. 62817721Speter */ 62917721Spetervoid 63017721Speterdefrouter_select(void) 63117721Speter{ 63217721Speter struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL; 63317721Speter struct llentry *ln = NULL; 63417721Speter 63517721Speter /* 63617721Speter * Let's handle easy case (3) first: 63717721Speter * If default router list is empty, there's nothing to be done. 63817721Speter */ 63917721Speter if (TAILQ_EMPTY(&V_nd_defrouter)) 64017721Speter return; 64117721Speter 64217721Speter /* 64317721Speter * Search for a (probably) reachable router from the list. 64417721Speter * We just pick up the first reachable one (if any), assuming that 64517721Speter * the ordering rule of the list described in defrtrlist_update(). 64617721Speter */ 64717721Speter TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) { 64817721Speter IF_AFDATA_RLOCK(dr->ifp); 64917721Speter if (selected_dr == NULL && 65017721Speter (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 65117721Speter ND6_IS_LLINFO_PROBREACH(ln)) { 65217721Speter selected_dr = dr; 65317721Speter } 65417721Speter IF_AFDATA_RUNLOCK(dr->ifp); 65517721Speter if (ln != NULL) { 65617721Speter LLE_RUNLOCK(ln); 65717721Speter ln = NULL; 65817721Speter } 65917721Speter 66017721Speter if (dr->installed && installed_dr == NULL) 66117721Speter installed_dr = dr; 66217721Speter else if (dr->installed && installed_dr) { 66317721Speter /* this should not happen. warn for diagnosis. */ 66417721Speter log(LOG_ERR, "defrouter_select: more than one router" 66517721Speter " is installed\n"); 66617721Speter } 66717721Speter } 66817721Speter /* 66917721Speter * If none of the default routers was found to be reachable, 67017721Speter * round-robin the list regardless of preference. 67117721Speter * Otherwise, if we have an installed router, check if the selected 67217721Speter * (reachable) router should really be preferred to the installed one. 67317721Speter * We only prefer the new router when the old one is not reachable 67417721Speter * or when the new one has a really higher preference value. 67517721Speter */ 67617721Speter if (selected_dr == NULL) { 67717721Speter if (installed_dr == NULL || !TAILQ_NEXT(installed_dr, dr_entry)) 67817721Speter selected_dr = TAILQ_FIRST(&V_nd_defrouter); 67917721Speter else 68017721Speter selected_dr = TAILQ_NEXT(installed_dr, dr_entry); 68117721Speter } else if (installed_dr) { 68217721Speter IF_AFDATA_RLOCK(installed_dr->ifp); 68317721Speter if ((ln = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) && 68417721Speter ND6_IS_LLINFO_PROBREACH(ln) && 68517721Speter rtpref(selected_dr) <= rtpref(installed_dr)) { 68617721Speter selected_dr = installed_dr; 68717721Speter } 68817721Speter IF_AFDATA_RUNLOCK(installed_dr->ifp); 68917721Speter if (ln != NULL) 69017721Speter LLE_RUNLOCK(ln); 69117721Speter } 69217721Speter 69317721Speter /* 69417721Speter * If the selected router is different than the installed one, 69517721Speter * remove the installed router and install the selected one. 69617721Speter * Note that the selected router is never NULL here. 69717721Speter */ 69817721Speter if (installed_dr != selected_dr) { 69917721Speter if (installed_dr) 70017721Speter defrouter_delreq(installed_dr); 70117721Speter defrouter_addreq(selected_dr); 70217721Speter } 70317721Speter 70417721Speter return; 70517721Speter} 70617721Speter 70717721Speter/* 70817721Speter * for default router selection 70917721Speter * regards router-preference field as a 2-bit signed integer 71017721Speter */ 71117721Speterstatic int 71217721Speterrtpref(struct nd_defrouter *dr) 71317721Speter{ 71417721Speter switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) { 71517721Speter case ND_RA_FLAG_RTPREF_HIGH: 71617721Speter return (RTPREF_HIGH); 71717721Speter case ND_RA_FLAG_RTPREF_MEDIUM: 71817721Speter case ND_RA_FLAG_RTPREF_RSV: 71917721Speter return (RTPREF_MEDIUM); 72017721Speter case ND_RA_FLAG_RTPREF_LOW: 72117721Speter return (RTPREF_LOW); 72217721Speter default: 72317721Speter /* 72417721Speter * This case should never happen. If it did, it would mean a 72517721Speter * serious bug of kernel internal. We thus always bark here. 72617721Speter * Or, can we even panic? 72717721Speter */ 72817721Speter log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->flags); 72917721Speter return (RTPREF_INVALID); 73017721Speter } 73117721Speter /* NOTREACHED */ 73217721Speter} 73317721Speter 73417721Speterstatic struct nd_defrouter * 73517721Speterdefrtrlist_update(struct nd_defrouter *new) 73617721Speter{ 73717721Speter struct nd_defrouter *dr, *n; 73817721Speter 73917721Speter if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 74017721Speter /* entry exists */ 74117721Speter if (new->rtlifetime == 0) { 74217721Speter defrtrlist_del(dr); 74317721Speter dr = NULL; 74417721Speter } else { 74517721Speter int oldpref = rtpref(dr); 74617721Speter 74717721Speter /* override */ 74817721Speter dr->flags = new->flags; /* xxx flag check */ 74917721Speter dr->rtlifetime = new->rtlifetime; 75017721Speter dr->expire = new->expire; 75117721Speter 75217721Speter /* 75317721Speter * If the preference does not change, there's no need 75417721Speter * to sort the entries. Also make sure the selected 75517721Speter * router is still installed in the kernel. 75617721Speter */ 75717721Speter if (dr->installed && rtpref(new) == oldpref) 75817721Speter return (dr); 75917721Speter 76017721Speter /* 76117721Speter * preferred router may be changed, so relocate 76217721Speter * this router. 76317721Speter * XXX: calling TAILQ_REMOVE directly is a bad manner. 76417721Speter * However, since defrtrlist_del() has many side 76517721Speter * effects, we intentionally do so here. 76617721Speter * defrouter_select() below will handle routing 76717721Speter * changes later. 76817721Speter */ 76917721Speter TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry); 77017721Speter n = dr; 77117721Speter goto insert; 77217721Speter } 77317721Speter return (dr); 77417721Speter } 77517721Speter 77617721Speter /* entry does not exist */ 77717721Speter if (new->rtlifetime == 0) 77817721Speter return (NULL); 77917721Speter 78017721Speter n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT); 78117721Speter if (n == NULL) 78217721Speter return (NULL); 78317721Speter bzero(n, sizeof(*n)); 78417721Speter *n = *new; 78517721Speter 78617721Speterinsert: 78717721Speter /* 78817721Speter * Insert the new router in the Default Router List; 78917721Speter * The Default Router List should be in the descending order 79017721Speter * of router-preferece. Routers with the same preference are 79117721Speter * sorted in the arriving time order. 79217721Speter */ 79317721Speter 79417721Speter /* insert at the end of the group */ 79517721Speter TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) { 79617721Speter if (rtpref(n) > rtpref(dr)) 79717721Speter break; 79817721Speter } 79917721Speter if (dr) 80017721Speter TAILQ_INSERT_BEFORE(dr, n, dr_entry); 80117721Speter else 80217721Speter TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry); 80317721Speter 80417721Speter defrouter_select(); 80517721Speter 80617721Speter return (n); 80717721Speter} 80817721Speter 80917721Speterstatic struct nd_pfxrouter * 81017721Speterpfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr) 81117721Speter{ 81217721Speter struct nd_pfxrouter *search; 81317721Speter 81417721Speter LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) { 81517721Speter if (search->router == dr) 81617721Speter break; 81717721Speter } 81817721Speter 81917721Speter return (search); 82017721Speter} 82117721Speter 82217721Speterstatic void 82317721Speterpfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr) 82417721Speter{ 82517721Speter struct nd_pfxrouter *new; 82617721Speter 82717721Speter new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 82817721Speter if (new == NULL) 82917721Speter return; 83017721Speter bzero(new, sizeof(*new)); 83117721Speter new->router = dr; 83217721Speter 83317721Speter LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 83417721Speter 83517721Speter pfxlist_onlink_check(); 83617721Speter} 83717721Speter 83817721Speterstatic void 83917721Speterpfxrtr_del(struct nd_pfxrouter *pfr) 84017721Speter{ 84117721Speter LIST_REMOVE(pfr, pfr_entry); 84217721Speter free(pfr, M_IP6NDP); 84317721Speter} 84417721Speter 84517721Speterstruct nd_prefix * 84617721Speternd6_prefix_lookup(struct nd_prefixctl *key) 84717721Speter{ 84817721Speter struct nd_prefix *search; 84917721Speter 85017721Speter LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) { 85117721Speter if (key->ndpr_ifp == search->ndpr_ifp && 85217721Speter key->ndpr_plen == search->ndpr_plen && 85317721Speter in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr, 85417721Speter &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) { 85517721Speter break; 85617721Speter } 85717721Speter } 85817721Speter 85917721Speter return (search); 86017721Speter} 86117721Speter 86217721Speterint 86317721Speternd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr, 86417721Speter struct nd_prefix **newp) 86517721Speter{ 86617721Speter struct nd_prefix *new = NULL; 86717721Speter int error = 0; 86817721Speter int i; 86917721Speter char ip6buf[INET6_ADDRSTRLEN]; 87017721Speter 87117721Speter new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 87217721Speter if (new == NULL) 87317721Speter return(ENOMEM); 87417721Speter bzero(new, sizeof(*new)); 87517721Speter new->ndpr_ifp = pr->ndpr_ifp; 87617721Speter new->ndpr_prefix = pr->ndpr_prefix; 87717721Speter new->ndpr_plen = pr->ndpr_plen; 87817721Speter new->ndpr_vltime = pr->ndpr_vltime; 87917721Speter new->ndpr_pltime = pr->ndpr_pltime; 88017721Speter new->ndpr_flags = pr->ndpr_flags; 88117721Speter if ((error = in6_init_prefix_ltimes(new)) != 0) { 88217721Speter free(new, M_IP6NDP); 88317721Speter return(error); 88417721Speter } 88517721Speter new->ndpr_lastupdate = time_uptime; 88617721Speter if (newp != NULL) 88717721Speter *newp = new; 88817721Speter 88917721Speter /* initialization */ 89017721Speter LIST_INIT(&new->ndpr_advrtrs); 89117721Speter in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 89217721Speter /* make prefix in the canonical form */ 89317721Speter for (i = 0; i < 4; i++) 89417721Speter new->ndpr_prefix.sin6_addr.s6_addr32[i] &= 89517721Speter new->ndpr_mask.s6_addr32[i]; 89617721Speter 89717721Speter /* link ndpr_entry to nd_prefix list */ 89817721Speter LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry); 89917721Speter 90017721Speter /* ND_OPT_PI_FLAG_ONLINK processing */ 90117721Speter if (new->ndpr_raf_onlink) { 90217721Speter int e; 90317721Speter 90417721Speter if ((e = nd6_prefix_onlink(new)) != 0) { 90517721Speter nd6log((LOG_ERR, "nd6_prelist_add: failed to make " 90617721Speter "the prefix %s/%d on-link on %s (errno=%d)\n", 90717721Speter ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 90817721Speter pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 90917721Speter /* proceed anyway. XXX: is it correct? */ 91017721Speter } 91117721Speter } 91217721Speter 91317721Speter if (dr) 91417721Speter pfxrtr_add(new, dr); 91517721Speter 91617721Speter return 0; 91717721Speter} 91817721Speter 91917721Spetervoid 92017721Speterprelist_remove(struct nd_prefix *pr) 92117721Speter{ 92217721Speter struct nd_pfxrouter *pfr, *next; 92317721Speter int e; 92417721Speter char ip6buf[INET6_ADDRSTRLEN]; 92517721Speter 92617721Speter /* make sure to invalidate the prefix until it is really freed. */ 92717721Speter pr->ndpr_vltime = 0; 92817721Speter pr->ndpr_pltime = 0; 92917721Speter 93017721Speter /* 93117721Speter * Though these flags are now meaningless, we'd rather keep the value 93217721Speter * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users 93317721Speter * when executing "ndp -p". 93417721Speter */ 93517721Speter 93617721Speter if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 && 93717721Speter (e = nd6_prefix_offlink(pr)) != 0) { 93817721Speter nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " 93917721Speter "on %s, errno=%d\n", 94017721Speter ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 94117721Speter pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 94217721Speter /* what should we do? */ 94317721Speter } 94417721Speter 94517721Speter if (pr->ndpr_refcnt > 0) 94617721Speter return; /* notice here? */ 94717721Speter 94817721Speter /* unlink ndpr_entry from nd_prefix list */ 94917721Speter LIST_REMOVE(pr, ndpr_entry); 95017721Speter 95117721Speter /* free list of routers that adversed the prefix */ 95217721Speter LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next) { 95317721Speter free(pfr, M_IP6NDP); 95417721Speter } 95517721Speter free(pr, M_IP6NDP); 95617721Speter 95717721Speter pfxlist_onlink_check(); 95817721Speter} 95917721Speter 96017721Speter/* 96117721Speter * dr - may be NULL 96217721Speter */ 96317721Speter 96417721Speterstatic int 96517721Speterprelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr, 96617721Speter struct mbuf *m, int mcast) 96717721Speter{ 96817721Speter struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 96917721Speter struct ifaddr *ifa; 97017721Speter struct ifnet *ifp = new->ndpr_ifp; 97117721Speter struct nd_prefix *pr; 97217721Speter int error = 0; 97317721Speter int newprefix = 0; 97417721Speter int auth; 97517721Speter struct in6_addrlifetime lt6_tmp; 97617721Speter char ip6buf[INET6_ADDRSTRLEN]; 97717721Speter 97817721Speter auth = 0; 97917721Speter if (m) { 98017721Speter /* 98117721Speter * Authenticity for NA consists authentication for 98217721Speter * both IP header and IP datagrams, doesn't it ? 98317721Speter */ 98417721Speter#if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 98517721Speter auth = ((m->m_flags & M_AUTHIPHDR) && 98617721Speter (m->m_flags & M_AUTHIPDGM)); 98717721Speter#endif 98817721Speter } 98917721Speter 99017721Speter if ((pr = nd6_prefix_lookup(new)) != NULL) { 99117721Speter /* 99217721Speter * nd6_prefix_lookup() ensures that pr and new have the same 99317721Speter * prefix on a same interface. 99417721Speter */ 99517721Speter 99617721Speter /* 99717721Speter * Update prefix information. Note that the on-link (L) bit 99817721Speter * and the autonomous (A) bit should NOT be changed from 1 99917721Speter * to 0. 100017721Speter */ 100117721Speter if (new->ndpr_raf_onlink == 1) 100217721Speter pr->ndpr_raf_onlink = 1; 100317721Speter if (new->ndpr_raf_auto == 1) 100417721Speter pr->ndpr_raf_auto = 1; 100517721Speter if (new->ndpr_raf_onlink) { 100617721Speter pr->ndpr_vltime = new->ndpr_vltime; 100717721Speter pr->ndpr_pltime = new->ndpr_pltime; 100817721Speter (void)in6_init_prefix_ltimes(pr); /* XXX error case? */ 100917721Speter pr->ndpr_lastupdate = time_uptime; 101017721Speter } 101117721Speter 101217721Speter if (new->ndpr_raf_onlink && 101317721Speter (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 101417721Speter int e; 101517721Speter 101617721Speter if ((e = nd6_prefix_onlink(pr)) != 0) { 101717721Speter nd6log((LOG_ERR, 101817721Speter "prelist_update: failed to make " 101917721Speter "the prefix %s/%d on-link on %s " 102017721Speter "(errno=%d)\n", 102117721Speter ip6_sprintf(ip6buf, 102217721Speter &pr->ndpr_prefix.sin6_addr), 102317721Speter pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 102417721Speter /* proceed anyway. XXX: is it correct? */ 102517721Speter } 102617721Speter } 102717721Speter 102817721Speter if (dr && pfxrtr_lookup(pr, dr) == NULL) 102917721Speter pfxrtr_add(pr, dr); 103017721Speter } else { 103117721Speter struct nd_prefix *newpr = NULL; 103217721Speter 103317721Speter newprefix = 1; 103417721Speter 103517721Speter if (new->ndpr_vltime == 0) 103617721Speter goto end; 103717721Speter if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) 103817721Speter goto end; 103917721Speter 104017721Speter error = nd6_prelist_add(new, dr, &newpr); 104117721Speter if (error != 0 || newpr == NULL) { 104217721Speter nd6log((LOG_NOTICE, "prelist_update: " 104317721Speter "nd6_prelist_add failed for %s/%d on %s " 104417721Speter "errno=%d, returnpr=%p\n", 104517721Speter ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr), 104617721Speter new->ndpr_plen, if_name(new->ndpr_ifp), 104717721Speter error, newpr)); 104817721Speter goto end; /* we should just give up in this case. */ 104917721Speter } 105017721Speter 105117721Speter /* 105217721Speter * XXX: from the ND point of view, we can ignore a prefix 105317721Speter * with the on-link bit being zero. However, we need a 105417721Speter * prefix structure for references from autoconfigured 105517721Speter * addresses. Thus, we explicitly make sure that the prefix 105617721Speter * itself expires now. 105717721Speter */ 105817721Speter if (newpr->ndpr_raf_onlink == 0) { 105917721Speter newpr->ndpr_vltime = 0; 106017721Speter newpr->ndpr_pltime = 0; 106117721Speter in6_init_prefix_ltimes(newpr); 106217721Speter } 106317721Speter 106417721Speter pr = newpr; 106517721Speter } 106617721Speter 106717721Speter /* 106817721Speter * Address autoconfiguration based on Section 5.5.3 of RFC 2462. 106917721Speter * Note that pr must be non NULL at this point. 107017721Speter */ 107117721Speter 107217721Speter /* 5.5.3 (a). Ignore the prefix without the A bit set. */ 107317721Speter if (!new->ndpr_raf_auto) 107417721Speter goto end; 107517721Speter 107617721Speter /* 107717721Speter * 5.5.3 (b). the link-local prefix should have been ignored in 107817721Speter * nd6_ra_input. 107917721Speter */ 108017721Speter 108117721Speter /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */ 108217721Speter if (new->ndpr_pltime > new->ndpr_vltime) { 108317721Speter error = EINVAL; /* XXX: won't be used */ 108417721Speter goto end; 108517721Speter } 108617721Speter 108717721Speter /* 108817721Speter * 5.5.3 (d). If the prefix advertised is not equal to the prefix of 108917721Speter * an address configured by stateless autoconfiguration already in the 109017721Speter * list of addresses associated with the interface, and the Valid 109117721Speter * Lifetime is not 0, form an address. We first check if we have 109217721Speter * a matching prefix. 109317721Speter * Note: we apply a clarification in rfc2462bis-02 here. We only 109417721Speter * consider autoconfigured addresses while RFC2462 simply said 109517721Speter * "address". 109617721Speter */ 109717721Speter IF_ADDR_RLOCK(ifp); 109817721Speter TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 109917721Speter struct in6_ifaddr *ifa6; 110017721Speter u_int32_t remaininglifetime; 110117721Speter 110217721Speter if (ifa->ifa_addr->sa_family != AF_INET6) 110317721Speter continue; 110417721Speter 110517721Speter ifa6 = (struct in6_ifaddr *)ifa; 110617721Speter 110717721Speter /* 110817721Speter * We only consider autoconfigured addresses as per rfc2462bis. 110917721Speter */ 111017721Speter if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF)) 111117721Speter continue; 111217721Speter 111317721Speter /* 111417721Speter * Spec is not clear here, but I believe we should concentrate 111517721Speter * on unicast (i.e. not anycast) addresses. 111617721Speter * XXX: other ia6_flags? detached or duplicated? 111717721Speter */ 111817721Speter if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) 111917721Speter continue; 112017721Speter 112117721Speter /* 112217721Speter * Ignore the address if it is not associated with a prefix 112317721Speter * or is associated with a prefix that is different from this 112417721Speter * one. (pr is never NULL here) 112517721Speter */ 112617721Speter if (ifa6->ia6_ndpr != pr) 112717721Speter continue; 112817721Speter 112917721Speter if (ia6_match == NULL) /* remember the first one */ 113017721Speter ia6_match = ifa6; 113117721Speter 113217721Speter /* 113317721Speter * An already autoconfigured address matched. Now that we 113417721Speter * are sure there is at least one matched address, we can 113517721Speter * proceed to 5.5.3. (e): update the lifetimes according to the 113617721Speter * "two hours" rule and the privacy extension. 113717721Speter * We apply some clarifications in rfc2462bis: 113817721Speter * - use remaininglifetime instead of storedlifetime as a 113917721Speter * variable name 114017721Speter * - remove the dead code in the "two-hour" rule 114117721Speter */ 114217721Speter#define TWOHOUR (120*60) 114317721Speter lt6_tmp = ifa6->ia6_lifetime; 114417721Speter 114517721Speter if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) 114617721Speter remaininglifetime = ND6_INFINITE_LIFETIME; 114717721Speter else if (time_uptime - ifa6->ia6_updatetime > 114817721Speter lt6_tmp.ia6t_vltime) { 114917721Speter /* 115017721Speter * The case of "invalid" address. We should usually 115117721Speter * not see this case. 115217721Speter */ 115317721Speter remaininglifetime = 0; 115417721Speter } else 115517721Speter remaininglifetime = lt6_tmp.ia6t_vltime - 115617721Speter (time_uptime - ifa6->ia6_updatetime); 115717721Speter 115817721Speter /* when not updating, keep the current stored lifetime. */ 115917721Speter lt6_tmp.ia6t_vltime = remaininglifetime; 116017721Speter 116117721Speter if (TWOHOUR < new->ndpr_vltime || 116217721Speter remaininglifetime < new->ndpr_vltime) { 116317721Speter lt6_tmp.ia6t_vltime = new->ndpr_vltime; 116417721Speter } else if (remaininglifetime <= TWOHOUR) { 116517721Speter if (auth) { 116617721Speter lt6_tmp.ia6t_vltime = new->ndpr_vltime; 116717721Speter } 116817721Speter } else { 116917721Speter /* 117017721Speter * new->ndpr_vltime <= TWOHOUR && 117117721Speter * TWOHOUR < remaininglifetime 117217721Speter */ 117317721Speter lt6_tmp.ia6t_vltime = TWOHOUR; 117417721Speter } 117517721Speter 117617721Speter /* The 2 hour rule is not imposed for preferred lifetime. */ 117717721Speter lt6_tmp.ia6t_pltime = new->ndpr_pltime; 117817721Speter 117917721Speter in6_init_address_ltimes(pr, <6_tmp); 118017721Speter 118117721Speter /* 118217721Speter * We need to treat lifetimes for temporary addresses 118317721Speter * differently, according to 118417721Speter * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1); 118517721Speter * we only update the lifetimes when they are in the maximum 118617721Speter * intervals. 118717721Speter */ 118817721Speter if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 118917721Speter u_int32_t maxvltime, maxpltime; 119017721Speter 119117721Speter if (V_ip6_temp_valid_lifetime > 119217721Speter (u_int32_t)((time_uptime - ifa6->ia6_createtime) + 119317721Speter V_ip6_desync_factor)) { 119417721Speter maxvltime = V_ip6_temp_valid_lifetime - 119517721Speter (time_uptime - ifa6->ia6_createtime) - 119617721Speter V_ip6_desync_factor; 119717721Speter } else 119817721Speter maxvltime = 0; 119917721Speter if (V_ip6_temp_preferred_lifetime > 120017721Speter (u_int32_t)((time_uptime - ifa6->ia6_createtime) + 120117721Speter V_ip6_desync_factor)) { 120217721Speter maxpltime = V_ip6_temp_preferred_lifetime - 120317721Speter (time_uptime - ifa6->ia6_createtime) - 120417721Speter V_ip6_desync_factor; 120517721Speter } else 120617721Speter maxpltime = 0; 120717721Speter 120817721Speter if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME || 120917721Speter lt6_tmp.ia6t_vltime > maxvltime) { 121017721Speter lt6_tmp.ia6t_vltime = maxvltime; 121117721Speter } 121217721Speter if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME || 121317721Speter lt6_tmp.ia6t_pltime > maxpltime) { 121417721Speter lt6_tmp.ia6t_pltime = maxpltime; 121517721Speter } 121617721Speter } 121717721Speter ifa6->ia6_lifetime = lt6_tmp; 121817721Speter ifa6->ia6_updatetime = time_uptime; 121917721Speter } 122017721Speter IF_ADDR_RUNLOCK(ifp); 122117721Speter if (ia6_match == NULL && new->ndpr_vltime) { 122217721Speter int ifidlen; 122317721Speter 122417721Speter /* 122517721Speter * 5.5.3 (d) (continued) 122617721Speter * No address matched and the valid lifetime is non-zero. 122717721Speter * Create a new address. 122817721Speter */ 122917721Speter 123017721Speter /* 123117721Speter * Prefix Length check: 123217721Speter * If the sum of the prefix length and interface identifier 123317721Speter * length does not equal 128 bits, the Prefix Information 123417721Speter * option MUST be ignored. The length of the interface 123517721Speter * identifier is defined in a separate link-type specific 123617721Speter * document. 123717721Speter */ 123817721Speter ifidlen = in6_if2idlen(ifp); 123917721Speter if (ifidlen < 0) { 124017721Speter /* this should not happen, so we always log it. */ 124117721Speter log(LOG_ERR, "prelist_update: IFID undefined (%s)\n", 124217721Speter if_name(ifp)); 124317721Speter goto end; 1244 } 1245 if (ifidlen + pr->ndpr_plen != 128) { 1246 nd6log((LOG_INFO, 1247 "prelist_update: invalid prefixlen " 1248 "%d for %s, ignored\n", 1249 pr->ndpr_plen, if_name(ifp))); 1250 goto end; 1251 } 1252 1253 if ((ia6 = in6_ifadd(new, mcast)) != NULL) { 1254 /* 1255 * note that we should use pr (not new) for reference. 1256 */ 1257 pr->ndpr_refcnt++; 1258 ia6->ia6_ndpr = pr; 1259 1260 /* 1261 * RFC 3041 3.3 (2). 1262 * When a new public address is created as described 1263 * in RFC2462, also create a new temporary address. 1264 * 1265 * RFC 3041 3.5. 1266 * When an interface connects to a new link, a new 1267 * randomized interface identifier should be generated 1268 * immediately together with a new set of temporary 1269 * addresses. Thus, we specifiy 1 as the 2nd arg of 1270 * in6_tmpifadd(). 1271 */ 1272 if (V_ip6_use_tempaddr) { 1273 int e; 1274 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) { 1275 nd6log((LOG_NOTICE, "prelist_update: " 1276 "failed to create a temporary " 1277 "address, errno=%d\n", 1278 e)); 1279 } 1280 } 1281 ifa_free(&ia6->ia_ifa); 1282 1283 /* 1284 * A newly added address might affect the status 1285 * of other addresses, so we check and update it. 1286 * XXX: what if address duplication happens? 1287 */ 1288 pfxlist_onlink_check(); 1289 } else { 1290 /* just set an error. do not bark here. */ 1291 error = EADDRNOTAVAIL; /* XXX: might be unused. */ 1292 } 1293 } 1294 1295 end: 1296 return error; 1297} 1298 1299/* 1300 * A supplement function used in the on-link detection below; 1301 * detect if a given prefix has a (probably) reachable advertising router. 1302 * XXX: lengthy function name... 1303 */ 1304static struct nd_pfxrouter * 1305find_pfxlist_reachable_router(struct nd_prefix *pr) 1306{ 1307 struct nd_pfxrouter *pfxrtr; 1308 struct llentry *ln; 1309 int canreach; 1310 1311 LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) { 1312 IF_AFDATA_RLOCK(pfxrtr->router->ifp); 1313 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp); 1314 IF_AFDATA_RUNLOCK(pfxrtr->router->ifp); 1315 if (ln == NULL) 1316 continue; 1317 canreach = ND6_IS_LLINFO_PROBREACH(ln); 1318 LLE_RUNLOCK(ln); 1319 if (canreach) 1320 break; 1321 } 1322 return (pfxrtr); 1323} 1324 1325/* 1326 * Check if each prefix in the prefix list has at least one available router 1327 * that advertised the prefix (a router is "available" if its neighbor cache 1328 * entry is reachable or probably reachable). 1329 * If the check fails, the prefix may be off-link, because, for example, 1330 * we have moved from the network but the lifetime of the prefix has not 1331 * expired yet. So we should not use the prefix if there is another prefix 1332 * that has an available router. 1333 * But, if there is no prefix that has an available router, we still regards 1334 * all the prefixes as on-link. This is because we can't tell if all the 1335 * routers are simply dead or if we really moved from the network and there 1336 * is no router around us. 1337 */ 1338void 1339pfxlist_onlink_check() 1340{ 1341 struct nd_prefix *pr; 1342 struct in6_ifaddr *ifa; 1343 struct nd_defrouter *dr; 1344 struct nd_pfxrouter *pfxrtr = NULL; 1345 1346 /* 1347 * Check if there is a prefix that has a reachable advertising 1348 * router. 1349 */ 1350 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1351 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1352 break; 1353 } 1354 1355 /* 1356 * If we have no such prefix, check whether we still have a router 1357 * that does not advertise any prefixes. 1358 */ 1359 if (pr == NULL) { 1360 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) { 1361 struct nd_prefix *pr0; 1362 1363 LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) { 1364 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL) 1365 break; 1366 } 1367 if (pfxrtr != NULL) 1368 break; 1369 } 1370 } 1371 if (pr != NULL || (!TAILQ_EMPTY(&V_nd_defrouter) && pfxrtr == NULL)) { 1372 /* 1373 * There is at least one prefix that has a reachable router, 1374 * or at least a router which probably does not advertise 1375 * any prefixes. The latter would be the case when we move 1376 * to a new link where we have a router that does not provide 1377 * prefixes and we configure an address by hand. 1378 * Detach prefixes which have no reachable advertising 1379 * router, and attach other prefixes. 1380 */ 1381 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1382 /* XXX: a link-local prefix should never be detached */ 1383 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1384 continue; 1385 1386 /* 1387 * we aren't interested in prefixes without the L bit 1388 * set. 1389 */ 1390 if (pr->ndpr_raf_onlink == 0) 1391 continue; 1392 1393 if (pr->ndpr_raf_auto == 0) 1394 continue; 1395 1396 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1397 find_pfxlist_reachable_router(pr) == NULL) 1398 pr->ndpr_stateflags |= NDPRF_DETACHED; 1399 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1400 find_pfxlist_reachable_router(pr) != 0) 1401 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1402 } 1403 } else { 1404 /* there is no prefix that has a reachable router */ 1405 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1406 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1407 continue; 1408 1409 if (pr->ndpr_raf_onlink == 0) 1410 continue; 1411 1412 if (pr->ndpr_raf_auto == 0) 1413 continue; 1414 1415 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0) 1416 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1417 } 1418 } 1419 1420 /* 1421 * Remove each interface route associated with a (just) detached 1422 * prefix, and reinstall the interface route for a (just) attached 1423 * prefix. Note that all attempt of reinstallation does not 1424 * necessarily success, when a same prefix is shared among multiple 1425 * interfaces. Such cases will be handled in nd6_prefix_onlink, 1426 * so we don't have to care about them. 1427 */ 1428 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1429 int e; 1430 char ip6buf[INET6_ADDRSTRLEN]; 1431 1432 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1433 continue; 1434 1435 if (pr->ndpr_raf_onlink == 0) 1436 continue; 1437 1438 if (pr->ndpr_raf_auto == 0) 1439 continue; 1440 1441 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1442 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1443 if ((e = nd6_prefix_offlink(pr)) != 0) { 1444 nd6log((LOG_ERR, 1445 "pfxlist_onlink_check: failed to " 1446 "make %s/%d offlink, errno=%d\n", 1447 ip6_sprintf(ip6buf, 1448 &pr->ndpr_prefix.sin6_addr), 1449 pr->ndpr_plen, e)); 1450 } 1451 } 1452 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1453 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 && 1454 pr->ndpr_raf_onlink) { 1455 if ((e = nd6_prefix_onlink(pr)) != 0) { 1456 nd6log((LOG_ERR, 1457 "pfxlist_onlink_check: failed to " 1458 "make %s/%d onlink, errno=%d\n", 1459 ip6_sprintf(ip6buf, 1460 &pr->ndpr_prefix.sin6_addr), 1461 pr->ndpr_plen, e)); 1462 } 1463 } 1464 } 1465 1466 /* 1467 * Changes on the prefix status might affect address status as well. 1468 * Make sure that all addresses derived from an attached prefix are 1469 * attached, and that all addresses derived from a detached prefix are 1470 * detached. Note, however, that a manually configured address should 1471 * always be attached. 1472 * The precise detection logic is same as the one for prefixes. 1473 * 1474 * XXXRW: in6_ifaddrhead locking. 1475 */ 1476 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { 1477 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1478 continue; 1479 1480 if (ifa->ia6_ndpr == NULL) { 1481 /* 1482 * This can happen when we first configure the address 1483 * (i.e. the address exists, but the prefix does not). 1484 * XXX: complicated relationships... 1485 */ 1486 continue; 1487 } 1488 1489 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1490 break; 1491 } 1492 if (ifa) { 1493 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { 1494 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1495 continue; 1496 1497 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ 1498 continue; 1499 1500 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) { 1501 if (ifa->ia6_flags & IN6_IFF_DETACHED) { 1502 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1503 ifa->ia6_flags |= IN6_IFF_TENTATIVE; 1504 nd6_dad_start((struct ifaddr *)ifa, 0); 1505 } 1506 } else { 1507 ifa->ia6_flags |= IN6_IFF_DETACHED; 1508 } 1509 } 1510 } 1511 else { 1512 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { 1513 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1514 continue; 1515 1516 if (ifa->ia6_flags & IN6_IFF_DETACHED) { 1517 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1518 ifa->ia6_flags |= IN6_IFF_TENTATIVE; 1519 /* Do we need a delay in this case? */ 1520 nd6_dad_start((struct ifaddr *)ifa, 0); 1521 } 1522 } 1523 } 1524} 1525 1526static int 1527nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa) 1528{ 1529 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1530 struct radix_node_head *rnh; 1531 struct rtentry *rt; 1532 struct sockaddr_in6 mask6; 1533 u_long rtflags; 1534 int error, a_failure, fibnum; 1535 1536 /* 1537 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. 1538 * ifa->ifa_rtrequest = nd6_rtrequest; 1539 */ 1540 bzero(&mask6, sizeof(mask6)); 1541 mask6.sin6_len = sizeof(mask6); 1542 mask6.sin6_addr = pr->ndpr_mask; 1543 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP; 1544 1545 a_failure = 0; 1546 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 1547 1548 rt = NULL; 1549 error = in6_rtrequest(RTM_ADD, 1550 (struct sockaddr *)&pr->ndpr_prefix, ifa->ifa_addr, 1551 (struct sockaddr *)&mask6, rtflags, &rt, fibnum); 1552 if (error == 0) { 1553 KASSERT(rt != NULL, ("%s: in6_rtrequest return no " 1554 "error(%d) but rt is NULL, pr=%p, ifa=%p", __func__, 1555 error, pr, ifa)); 1556 1557 rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6); 1558 /* XXX what if rhn == NULL? */ 1559 RADIX_NODE_HEAD_LOCK(rnh); 1560 RT_LOCK(rt); 1561 if (rt_setgate(rt, rt_key(rt), 1562 (struct sockaddr *)&null_sdl) == 0) { 1563 struct sockaddr_dl *dl; 1564 1565 dl = (struct sockaddr_dl *)rt->rt_gateway; 1566 dl->sdl_type = rt->rt_ifp->if_type; 1567 dl->sdl_index = rt->rt_ifp->if_index; 1568 } 1569 RADIX_NODE_HEAD_UNLOCK(rnh); 1570 nd6_rtmsg(RTM_ADD, rt); 1571 RT_UNLOCK(rt); 1572 pr->ndpr_stateflags |= NDPRF_ONLINK; 1573 } else { 1574 char ip6buf[INET6_ADDRSTRLEN]; 1575 char ip6bufg[INET6_ADDRSTRLEN]; 1576 char ip6bufm[INET6_ADDRSTRLEN]; 1577 struct sockaddr_in6 *sin6; 1578 1579 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1580 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add " 1581 "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, " 1582 "flags=%lx errno = %d\n", 1583 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1584 pr->ndpr_plen, if_name(pr->ndpr_ifp), 1585 ip6_sprintf(ip6bufg, &sin6->sin6_addr), 1586 ip6_sprintf(ip6bufm, &mask6.sin6_addr), 1587 rtflags, error)); 1588 1589 /* Save last error to return, see rtinit(). */ 1590 a_failure = error; 1591 } 1592 1593 if (rt != NULL) { 1594 RT_LOCK(rt); 1595 RT_REMREF(rt); 1596 RT_UNLOCK(rt); 1597 } 1598 } 1599 1600 /* Return the last error we got. */ 1601 return (a_failure); 1602} 1603 1604static int 1605nd6_prefix_onlink(struct nd_prefix *pr) 1606{ 1607 struct ifaddr *ifa; 1608 struct ifnet *ifp = pr->ndpr_ifp; 1609 struct nd_prefix *opr; 1610 int error = 0; 1611 char ip6buf[INET6_ADDRSTRLEN]; 1612 1613 /* sanity check */ 1614 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1615 nd6log((LOG_ERR, 1616 "nd6_prefix_onlink: %s/%d is already on-link\n", 1617 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1618 pr->ndpr_plen)); 1619 return (EEXIST); 1620 } 1621 1622 /* 1623 * Add the interface route associated with the prefix. Before 1624 * installing the route, check if there's the same prefix on another 1625 * interface, and the prefix has already installed the interface route. 1626 * Although such a configuration is expected to be rare, we explicitly 1627 * allow it. 1628 */ 1629 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) { 1630 if (opr == pr) 1631 continue; 1632 1633 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) 1634 continue; 1635 1636 if (opr->ndpr_plen == pr->ndpr_plen && 1637 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1638 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) 1639 return (0); 1640 } 1641 1642 /* 1643 * We prefer link-local addresses as the associated interface address. 1644 */ 1645 /* search for a link-local addr */ 1646 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 1647 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST); 1648 if (ifa == NULL) { 1649 /* XXX: freebsd does not have ifa_ifwithaf */ 1650 IF_ADDR_RLOCK(ifp); 1651 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1652 if (ifa->ifa_addr->sa_family == AF_INET6) 1653 break; 1654 } 1655 if (ifa != NULL) 1656 ifa_ref(ifa); 1657 IF_ADDR_RUNLOCK(ifp); 1658 /* should we care about ia6_flags? */ 1659 } 1660 if (ifa == NULL) { 1661 /* 1662 * This can still happen, when, for example, we receive an RA 1663 * containing a prefix with the L bit set and the A bit clear, 1664 * after removing all IPv6 addresses on the receiving 1665 * interface. This should, of course, be rare though. 1666 */ 1667 nd6log((LOG_NOTICE, 1668 "nd6_prefix_onlink: failed to find any ifaddr" 1669 " to add route for a prefix(%s/%d) on %s\n", 1670 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1671 pr->ndpr_plen, if_name(ifp))); 1672 return (0); 1673 } 1674 1675 error = nd6_prefix_onlink_rtrequest(pr, ifa); 1676 1677 if (ifa != NULL) 1678 ifa_free(ifa); 1679 1680 return (error); 1681} 1682 1683static int 1684nd6_prefix_offlink(struct nd_prefix *pr) 1685{ 1686 int error = 0; 1687 struct ifnet *ifp = pr->ndpr_ifp; 1688 struct nd_prefix *opr; 1689 struct sockaddr_in6 sa6, mask6; 1690 struct rtentry *rt; 1691 char ip6buf[INET6_ADDRSTRLEN]; 1692 int fibnum, a_failure; 1693 1694 /* sanity check */ 1695 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 1696 nd6log((LOG_ERR, 1697 "nd6_prefix_offlink: %s/%d is already off-link\n", 1698 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1699 pr->ndpr_plen)); 1700 return (EEXIST); 1701 } 1702 1703 bzero(&sa6, sizeof(sa6)); 1704 sa6.sin6_family = AF_INET6; 1705 sa6.sin6_len = sizeof(sa6); 1706 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 1707 sizeof(struct in6_addr)); 1708 bzero(&mask6, sizeof(mask6)); 1709 mask6.sin6_family = AF_INET6; 1710 mask6.sin6_len = sizeof(sa6); 1711 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 1712 1713 a_failure = 0; 1714 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 1715 rt = NULL; 1716 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, 1717 (struct sockaddr *)&mask6, 0, &rt, fibnum); 1718 if (error == 0) { 1719 /* report the route deletion to the routing socket. */ 1720 if (rt != NULL) 1721 nd6_rtmsg(RTM_DELETE, rt); 1722 } else { 1723 /* Save last error to return, see rtinit(). */ 1724 a_failure = error; 1725 } 1726 if (rt != NULL) { 1727 RTFREE(rt); 1728 } 1729 } 1730 error = a_failure; 1731 a_failure = 1; 1732 if (error == 0) { 1733 pr->ndpr_stateflags &= ~NDPRF_ONLINK; 1734 1735 /* 1736 * There might be the same prefix on another interface, 1737 * the prefix which could not be on-link just because we have 1738 * the interface route (see comments in nd6_prefix_onlink). 1739 * If there's one, try to make the prefix on-link on the 1740 * interface. 1741 */ 1742 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) { 1743 if (opr == pr) 1744 continue; 1745 1746 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0) 1747 continue; 1748 1749 /* 1750 * KAME specific: detached prefixes should not be 1751 * on-link. 1752 */ 1753 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0) 1754 continue; 1755 1756 if (opr->ndpr_plen == pr->ndpr_plen && 1757 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1758 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) { 1759 int e; 1760 1761 if ((e = nd6_prefix_onlink(opr)) != 0) { 1762 nd6log((LOG_ERR, 1763 "nd6_prefix_offlink: failed to " 1764 "recover a prefix %s/%d from %s " 1765 "to %s (errno = %d)\n", 1766 ip6_sprintf(ip6buf, 1767 &opr->ndpr_prefix.sin6_addr), 1768 opr->ndpr_plen, if_name(ifp), 1769 if_name(opr->ndpr_ifp), e)); 1770 } else 1771 a_failure = 0; 1772 } 1773 } 1774 } else { 1775 /* XXX: can we still set the NDPRF_ONLINK flag? */ 1776 nd6log((LOG_ERR, 1777 "nd6_prefix_offlink: failed to delete route: " 1778 "%s/%d on %s (errno = %d)\n", 1779 ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen, 1780 if_name(ifp), error)); 1781 } 1782 1783 if (a_failure) 1784 lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6, 1785 (struct sockaddr *)&mask6, LLE_STATIC); 1786 1787 return (error); 1788} 1789 1790static struct in6_ifaddr * 1791in6_ifadd(struct nd_prefixctl *pr, int mcast) 1792{ 1793 struct ifnet *ifp = pr->ndpr_ifp; 1794 struct ifaddr *ifa; 1795 struct in6_aliasreq ifra; 1796 struct in6_ifaddr *ia, *ib; 1797 int error, plen0; 1798 struct in6_addr mask; 1799 int prefixlen = pr->ndpr_plen; 1800 int updateflags; 1801 char ip6buf[INET6_ADDRSTRLEN]; 1802 1803 in6_prefixlen2mask(&mask, prefixlen); 1804 1805 /* 1806 * find a link-local address (will be interface ID). 1807 * Is it really mandatory? Theoretically, a global or a site-local 1808 * address can be configured without a link-local address, if we 1809 * have a unique interface identifier... 1810 * 1811 * it is not mandatory to have a link-local address, we can generate 1812 * interface identifier on the fly. we do this because: 1813 * (1) it should be the easiest way to find interface identifier. 1814 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1815 * for multiple addresses on a single interface, and possible shortcut 1816 * of DAD. we omitted DAD for this reason in the past. 1817 * (3) a user can prevent autoconfiguration of global address 1818 * by removing link-local address by hand (this is partly because we 1819 * don't have other way to control the use of IPv6 on an interface. 1820 * this has been our design choice - cf. NRL's "ifconfig auto"). 1821 * (4) it is easier to manage when an interface has addresses 1822 * with the same interface identifier, than to have multiple addresses 1823 * with different interface identifiers. 1824 */ 1825 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */ 1826 if (ifa) 1827 ib = (struct in6_ifaddr *)ifa; 1828 else 1829 return NULL; 1830 1831 /* prefixlen + ifidlen must be equal to 128 */ 1832 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1833 if (prefixlen != plen0) { 1834 ifa_free(ifa); 1835 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " 1836 "(prefix=%d ifid=%d)\n", 1837 if_name(ifp), prefixlen, 128 - plen0)); 1838 return NULL; 1839 } 1840 1841 /* make ifaddr */ 1842 1843 bzero(&ifra, sizeof(ifra)); 1844 /* 1845 * in6_update_ifa() does not use ifra_name, but we accurately set it 1846 * for safety. 1847 */ 1848 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1849 ifra.ifra_addr.sin6_family = AF_INET6; 1850 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 1851 /* prefix */ 1852 ifra.ifra_addr.sin6_addr = pr->ndpr_prefix.sin6_addr; 1853 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1854 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1855 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1856 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1857 1858 /* interface ID */ 1859 ifra.ifra_addr.sin6_addr.s6_addr32[0] |= 1860 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]); 1861 ifra.ifra_addr.sin6_addr.s6_addr32[1] |= 1862 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]); 1863 ifra.ifra_addr.sin6_addr.s6_addr32[2] |= 1864 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]); 1865 ifra.ifra_addr.sin6_addr.s6_addr32[3] |= 1866 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]); 1867 ifa_free(ifa); 1868 1869 /* new prefix mask. */ 1870 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1871 ifra.ifra_prefixmask.sin6_family = AF_INET6; 1872 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, 1873 sizeof(ifra.ifra_prefixmask.sin6_addr)); 1874 1875 /* lifetimes. */ 1876 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1877 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1878 1879 /* XXX: scope zone ID? */ 1880 1881 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1882 1883 /* 1884 * Make sure that we do not have this address already. This should 1885 * usually not happen, but we can still see this case, e.g., if we 1886 * have manually configured the exact address to be configured. 1887 */ 1888 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, 1889 &ifra.ifra_addr.sin6_addr); 1890 if (ifa != NULL) { 1891 ifa_free(ifa); 1892 /* this should be rare enough to make an explicit log */ 1893 log(LOG_INFO, "in6_ifadd: %s is already configured\n", 1894 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr)); 1895 return (NULL); 1896 } 1897 1898 /* 1899 * Allocate ifaddr structure, link into chain, etc. 1900 * If we are going to create a new address upon receiving a multicasted 1901 * RA, we need to impose a random delay before starting DAD. 1902 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2] 1903 */ 1904 updateflags = 0; 1905 if (mcast) 1906 updateflags |= IN6_IFAUPDATE_DADDELAY; 1907 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) { 1908 nd6log((LOG_ERR, 1909 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", 1910 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr), 1911 if_name(ifp), error)); 1912 return (NULL); /* ifaddr must not have been allocated. */ 1913 } 1914 1915 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1916 /* 1917 * XXXRW: Assumption of non-NULLness here might not be true with 1918 * fine-grained locking -- should we validate it? Or just return 1919 * earlier ifa rather than looking it up again? 1920 */ 1921 return (ia); /* this is always non-NULL and referenced. */ 1922} 1923 1924/* 1925 * ia0 - corresponding public address 1926 */ 1927int 1928in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay) 1929{ 1930 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 1931 struct in6_ifaddr *newia, *ia; 1932 struct in6_aliasreq ifra; 1933 int i, error; 1934 int trylimit = 3; /* XXX: adhoc value */ 1935 int updateflags; 1936 u_int32_t randid[2]; 1937 time_t vltime0, pltime0; 1938 1939 bzero(&ifra, sizeof(ifra)); 1940 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1941 ifra.ifra_addr = ia0->ia_addr; 1942 /* copy prefix mask */ 1943 ifra.ifra_prefixmask = ia0->ia_prefixmask; 1944 /* clear the old IFID */ 1945 for (i = 0; i < 4; i++) { 1946 ifra.ifra_addr.sin6_addr.s6_addr32[i] &= 1947 ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; 1948 } 1949 1950 again: 1951 if (in6_get_tmpifid(ifp, (u_int8_t *)randid, 1952 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) { 1953 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good " 1954 "random IFID\n")); 1955 return (EINVAL); 1956 } 1957 ifra.ifra_addr.sin6_addr.s6_addr32[2] |= 1958 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 1959 ifra.ifra_addr.sin6_addr.s6_addr32[3] |= 1960 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 1961 1962 /* 1963 * in6_get_tmpifid() quite likely provided a unique interface ID. 1964 * However, we may still have a chance to see collision, because 1965 * there may be a time lag between generation of the ID and generation 1966 * of the address. So, we'll do one more sanity check. 1967 */ 1968 IN6_IFADDR_RLOCK(); 1969 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1970 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1971 &ifra.ifra_addr.sin6_addr)) { 1972 if (trylimit-- == 0) { 1973 IN6_IFADDR_RUNLOCK(); 1974 /* 1975 * Give up. Something strange should have 1976 * happened. 1977 */ 1978 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to " 1979 "find a unique random IFID\n")); 1980 return (EEXIST); 1981 } 1982 IN6_IFADDR_RUNLOCK(); 1983 forcegen = 1; 1984 goto again; 1985 } 1986 } 1987 IN6_IFADDR_RUNLOCK(); 1988 1989 /* 1990 * The Valid Lifetime is the lower of the Valid Lifetime of the 1991 * public address or TEMP_VALID_LIFETIME. 1992 * The Preferred Lifetime is the lower of the Preferred Lifetime 1993 * of the public address or TEMP_PREFERRED_LIFETIME - 1994 * DESYNC_FACTOR. 1995 */ 1996 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1997 vltime0 = IFA6_IS_INVALID(ia0) ? 0 : 1998 (ia0->ia6_lifetime.ia6t_vltime - 1999 (time_uptime - ia0->ia6_updatetime)); 2000 if (vltime0 > V_ip6_temp_valid_lifetime) 2001 vltime0 = V_ip6_temp_valid_lifetime; 2002 } else 2003 vltime0 = V_ip6_temp_valid_lifetime; 2004 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 2005 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : 2006 (ia0->ia6_lifetime.ia6t_pltime - 2007 (time_uptime - ia0->ia6_updatetime)); 2008 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){ 2009 pltime0 = V_ip6_temp_preferred_lifetime - 2010 V_ip6_desync_factor; 2011 } 2012 } else 2013 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor; 2014 ifra.ifra_lifetime.ia6t_vltime = vltime0; 2015 ifra.ifra_lifetime.ia6t_pltime = pltime0; 2016 2017 /* 2018 * A temporary address is created only if this calculated Preferred 2019 * Lifetime is greater than REGEN_ADVANCE time units. 2020 */ 2021 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance) 2022 return (0); 2023 2024 /* XXX: scope zone ID? */ 2025 2026 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 2027 2028 /* allocate ifaddr structure, link into chain, etc. */ 2029 updateflags = 0; 2030 if (delay) 2031 updateflags |= IN6_IFAUPDATE_DADDELAY; 2032 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) 2033 return (error); 2034 2035 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 2036 if (newia == NULL) { /* XXX: can it happen? */ 2037 nd6log((LOG_ERR, 2038 "in6_tmpifadd: ifa update succeeded, but we got " 2039 "no ifaddr\n")); 2040 return (EINVAL); /* XXX */ 2041 } 2042 newia->ia6_ndpr = ia0->ia6_ndpr; 2043 newia->ia6_ndpr->ndpr_refcnt++; 2044 ifa_free(&newia->ia_ifa); 2045 2046 /* 2047 * A newly added address might affect the status of other addresses. 2048 * XXX: when the temporary address is generated with a new public 2049 * address, the onlink check is redundant. However, it would be safe 2050 * to do the check explicitly everywhere a new address is generated, 2051 * and, in fact, we surely need the check when we create a new 2052 * temporary address due to deprecation of an old temporary address. 2053 */ 2054 pfxlist_onlink_check(); 2055 2056 return (0); 2057} 2058 2059static int 2060in6_init_prefix_ltimes(struct nd_prefix *ndpr) 2061{ 2062 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 2063 ndpr->ndpr_preferred = 0; 2064 else 2065 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime; 2066 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 2067 ndpr->ndpr_expire = 0; 2068 else 2069 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime; 2070 2071 return 0; 2072} 2073 2074static void 2075in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 2076{ 2077 /* init ia6t_expire */ 2078 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 2079 lt6->ia6t_expire = 0; 2080 else { 2081 lt6->ia6t_expire = time_uptime; 2082 lt6->ia6t_expire += lt6->ia6t_vltime; 2083 } 2084 2085 /* init ia6t_preferred */ 2086 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 2087 lt6->ia6t_preferred = 0; 2088 else { 2089 lt6->ia6t_preferred = time_uptime; 2090 lt6->ia6t_preferred += lt6->ia6t_pltime; 2091 } 2092} 2093 2094/* 2095 * Delete all the routing table entries that use the specified gateway. 2096 * XXX: this function causes search through all entries of routing table, so 2097 * it shouldn't be called when acting as a router. 2098 */ 2099void 2100rt6_flush(struct in6_addr *gateway, struct ifnet *ifp) 2101{ 2102 struct radix_node_head *rnh; 2103 u_int fibnum; 2104 2105 /* We'll care only link-local addresses */ 2106 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) 2107 return; 2108 2109 /* XXX Do we really need to walk any but the default FIB? */ 2110 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 2111 rnh = rt_tables_get_rnh(fibnum, AF_INET6); 2112 if (rnh == NULL) 2113 continue; 2114 2115 RADIX_NODE_HEAD_LOCK(rnh); 2116 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 2117 RADIX_NODE_HEAD_UNLOCK(rnh); 2118 } 2119} 2120 2121static int 2122rt6_deleteroute(struct radix_node *rn, void *arg) 2123{ 2124#define SIN6(s) ((struct sockaddr_in6 *)s) 2125 struct rtentry *rt = (struct rtentry *)rn; 2126 struct in6_addr *gate = (struct in6_addr *)arg; 2127 2128 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) 2129 return (0); 2130 2131 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) { 2132 return (0); 2133 } 2134 2135 /* 2136 * Do not delete a static route. 2137 * XXX: this seems to be a bit ad-hoc. Should we consider the 2138 * 'cloned' bit instead? 2139 */ 2140 if ((rt->rt_flags & RTF_STATIC) != 0) 2141 return (0); 2142 2143 /* 2144 * We delete only host route. This means, in particular, we don't 2145 * delete default route. 2146 */ 2147 if ((rt->rt_flags & RTF_HOST) == 0) 2148 return (0); 2149 2150 return (in6_rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 2151 rt_mask(rt), rt->rt_flags, NULL, rt->rt_fibnum)); 2152#undef SIN6 2153} 2154 2155int 2156nd6_setdefaultiface(int ifindex) 2157{ 2158 int error = 0; 2159 2160 if (ifindex < 0 || V_if_index < ifindex) 2161 return (EINVAL); 2162 if (ifindex != 0 && !ifnet_byindex(ifindex)) 2163 return (EINVAL); 2164 2165 if (V_nd6_defifindex != ifindex) { 2166 V_nd6_defifindex = ifindex; 2167 if (V_nd6_defifindex > 0) 2168 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex); 2169 else 2170 V_nd6_defifp = NULL; 2171 2172 /* 2173 * Our current implementation assumes one-to-one maping between 2174 * interfaces and links, so it would be natural to use the 2175 * default interface as the default link. 2176 */ 2177 scope6_setdefault(V_nd6_defifp); 2178 } 2179 2180 return (error); 2181} 2182