diff options
Diffstat (limited to 'sys/netinet6/nd6_rtr.c')
| -rw-r--r-- | sys/netinet6/nd6_rtr.c | 1243 |
1 files changed, 1243 insertions, 0 deletions
diff --git a/sys/netinet6/nd6_rtr.c b/sys/netinet6/nd6_rtr.c new file mode 100644 index 0000000..d177a66 --- /dev/null +++ b/sys/netinet6/nd6_rtr.c @@ -0,0 +1,1243 @@ +/* + * 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. + * + * $FreeBSD$ + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/socket.h> +#include <sys/sockio.h> +#include <sys/time.h> +#include <sys/kernel.h> +#include <sys/errno.h> +#include <sys/syslog.h> + +#include <net/if.h> +#include <net/if_types.h> +#include <net/if_dl.h> +#include <net/route.h> +#include <net/radix.h> + +#include <netinet/in.h> +#include <netinet6/in6_var.h> +#include <netinet6/ip6.h> +#include <netinet6/ip6_var.h> +#include <netinet6/nd6.h> +#include <netinet6/icmp6.h> + +#include <net/net_osdep.h> + +#define SDL(s) ((struct sockaddr_dl *)s) + +static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *)); +static int prelist_add __P((struct nd_prefix *, struct nd_defrouter *)); +static struct nd_prefix *prefix_lookup __P((struct nd_prefix *)); +static struct in6_ifaddr *in6_ifadd __P((struct ifnet *, struct in6_addr *, + struct in6_addr *, int)); +static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *, + struct nd_defrouter *)); +static void pfxrtr_add __P((struct nd_prefix *, struct nd_defrouter *)); +static void pfxrtr_del __P((struct nd_pfxrouter *)); +static void pfxlist_onlink_check __P((void)); +static void nd6_detach_prefix __P((struct nd_prefix *)); +static void nd6_attach_prefix __P((struct nd_prefix *)); + +static void in6_init_address_ltimes __P((struct nd_prefix *ndpr, + struct in6_addrlifetime *lt6)); + +static int rt6_deleteroute __P((struct radix_node *, void *)); + +extern int nd6_recalc_reachtm_interval; + +/* + * 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(m, off, icmp6len) + struct mbuf *m; + int off, icmp6len; +{ + struct ifnet *ifp = m->m_pkthdr.rcvif; + struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); + struct nd_router_solicit *nd_rs + = (struct nd_router_solicit *)((caddr_t)ip6 + off); + struct in6_addr saddr6 = ip6->ip6_src; + char *lladdr = NULL; + int lladdrlen = 0; + union nd_opts ndopts; + + /* If I'm not a router, ignore it. */ + if (ip6_accept_rtadv != 0 || ip6_forwarding != 1) + return; + + /* Sanity checks */ + if (ip6->ip6_hlim != 255) { + log(LOG_ERR, + "nd6_rs_input: invalid hlim %d\n", ip6->ip6_hlim); + return; + } + + /* + * Don't update the neighbor cache, if src = ::. + * This indicates that the src has no IP address assigned yet. + */ + if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) + return; + + icmp6len -= sizeof(*nd_rs); + nd6_option_init(nd_rs + 1, icmp6len, &ndopts); + if (nd6_options(&ndopts) < 0) { + log(LOG_INFO, "nd6_rs_input: invalid ND option, ignored\n"); + return; + } + + 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) { + log(LOG_INFO, + "nd6_rs_input: lladdrlen mismatch for %s " + "(if %d, RS packet %d)\n", + ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2); + } + + nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); +} + +/* + * 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(m, off, icmp6len) + struct mbuf *m; + int off, icmp6len; +{ + struct ifnet *ifp = m->m_pkthdr.rcvif; + struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; + struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); + struct nd_router_advert *nd_ra = + (struct nd_router_advert *)((caddr_t)ip6 + off); + struct in6_addr saddr6 = ip6->ip6_src; + union nd_opts ndopts; + struct nd_defrouter *dr; + + if (ip6_accept_rtadv == 0) + return; + + if (ip6->ip6_hlim != 255) { + log(LOG_ERR, + "nd6_ra_input: invalid hlim %d\n", ip6->ip6_hlim); + return; + } + + if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { + log(LOG_ERR, + "nd6_ra_input: src %s is not link-local\n", + ip6_sprintf(&saddr6)); + return; + } + + icmp6len -= sizeof(*nd_ra); + nd6_option_init(nd_ra + 1, icmp6len, &ndopts); + if (nd6_options(&ndopts) < 0) { + log(LOG_INFO, "nd6_ra_input: invalid ND option, ignored\n"); + return; + } + + { + struct nd_defrouter dr0; + u_int32_t advreachable = nd_ra->nd_ra_reachable; + + dr0.rtaddr = saddr6; + dr0.flags = nd_ra->nd_ra_flags_reserved; + dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); + dr0.expire = time_second + dr0.rtlifetime; + dr0.ifp = ifp; + /* unspecified or not? (RFC 2461 6.3.4) */ + if (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) + ndi->chlim = nd_ra->nd_ra_curhoplimit; + dr = defrtrlist_update(&dr0); + } + + /* + * prefix + */ + if (ndopts.nd_opts_pi) { + struct nd_opt_hdr *pt; + struct nd_opt_prefix_info *pi; + struct nd_prefix pr; + + for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; + pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; + pt = (struct nd_opt_hdr *)((caddr_t)pt + + (pt->nd_opt_len << 3))) { + if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) + continue; + pi = (struct nd_opt_prefix_info *)pt; + + if (pi->nd_opt_pi_len != 4) { + log(LOG_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) { + log(LOG_INFO, "nd6_ra_input: invalid prefix " + "len %d for prefix information option, " + "ignored\n", pi->nd_opt_pi_prefix_len); + continue; + } + + if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) + || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { + log(LOG_INFO, "nd6_ra_input: invalid prefix " + "%s, ignored\n", + ip6_sprintf(&pi->nd_opt_pi_prefix)); + continue; + } + + /* aggregatable unicast address, rfc2374 */ + if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20 + && pi->nd_opt_pi_prefix_len != 64) { + log(LOG_INFO, "nd6_ra_input: invalid prefixlen " + "%d for rfc2374 prefix %s, ignored\n", + pi->nd_opt_pi_prefix_len, + ip6_sprintf(&pi->nd_opt_pi_prefix)); + continue; + } + + bzero(&pr, sizeof(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 = (struct ifnet *)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); + + if (in6_init_prefix_ltimes(&pr)) + continue; /* prefix lifetime init failed */ + + (void)prelist_update(&pr, dr, m); + } + } + + /* + * MTU + */ + if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { + u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); + + /* lower bound */ + if (mtu < IPV6_MMTU) { + log(LOG_INFO, "nd6_ra_input: bogus mtu option " + "mtu=%d sent from %s, ignoring\n", + mtu, ip6_sprintf(&ip6->ip6_src)); + goto skip; + } + + /* upper bound */ + if (ndi->maxmtu) { + if (mtu <= ndi->maxmtu) { + int change = (ndi->linkmtu != mtu); + + ndi->linkmtu = mtu; + if (change) /* in6_maxmtu may change */ + in6_setmaxmtu(); + } else { + log(LOG_INFO, "nd6_ra_input: bogus mtu " + "mtu=%d sent from %s; " + "exceeds maxmtu %d, ignoring\n", + mtu, ip6_sprintf(&ip6->ip6_src), + ndi->maxmtu); + } + } else { + log(LOG_INFO, "nd6_ra_input: mtu option " + "mtu=%d sent from %s; maxmtu unknown, " + "ignoring\n", + mtu, ip6_sprintf(&ip6->ip6_src)); + } + } + + skip: + + /* + * Src linkaddress + */ + { + char *lladdr = NULL; + int lladdrlen = 0; + + if (ndopts.nd_opts_src_lladdr) { + lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); + lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; + } + + if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { + log(LOG_INFO, + "nd6_ra_input: lladdrlen mismatch for %s " + "(if %d, RA packet %d)\n", + ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2); + } + + nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); + } +} + +/* + * default router list proccessing sub routines + */ +void +defrouter_addreq(new) + struct nd_defrouter *new; +{ + struct sockaddr_in6 def, mask, gate; + int s; + + Bzero(&def, sizeof(def)); + Bzero(&mask, sizeof(mask)); + Bzero(&gate, sizeof(gate)); + + def.sin6_len = mask.sin6_len = gate.sin6_len + = sizeof(struct sockaddr_in6); + def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; + gate.sin6_addr = new->rtaddr; + + s = splnet(); + (void)rtrequest(RTM_ADD, (struct sockaddr *)&def, + (struct sockaddr *)&gate, (struct sockaddr *)&mask, + RTF_GATEWAY, NULL); + splx(s); + return; +} + +struct nd_defrouter * +defrouter_lookup(addr, ifp) + struct in6_addr *addr; + struct ifnet *ifp; +{ + struct nd_defrouter *dr; + + for(dr = nd_defrouter.lh_first; dr; dr = dr->dr_next) + if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) + return(dr); + + return(NULL); /* search failed */ +} + +void +defrouter_delreq(dr, dofree) + struct nd_defrouter *dr; + int dofree; +{ + struct sockaddr_in6 def, mask, gate; + + Bzero(&def, sizeof(def)); + Bzero(&mask, sizeof(mask)); + Bzero(&gate, sizeof(gate)); + + def.sin6_len = mask.sin6_len = gate.sin6_len + = sizeof(struct sockaddr_in6); + def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; + gate.sin6_addr = dr->rtaddr; + + rtrequest(RTM_DELETE, (struct sockaddr *)&def, + (struct sockaddr *)&gate, + (struct sockaddr *)&mask, + RTF_GATEWAY, (struct rtentry **)0); + + if (dofree) + free(dr, M_IP6NDP); + + if (nd_defrouter.lh_first) + defrouter_addreq(nd_defrouter.lh_first); + + /* + * xxx update the Destination Cache entries for all + * destinations using that neighbor as a router (7.2.5) + */ +} + +void +defrtrlist_del(dr) + struct nd_defrouter *dr; +{ + struct nd_defrouter *deldr = NULL; + struct nd_prefix *pr; + + /* + * Flush all the routing table entries that use the router + * as a next hop. + */ + if (!ip6_forwarding && ip6_accept_rtadv) { + /* above is a good condition? */ + rt6_flush(&dr->rtaddr, dr->ifp); + } + + if (dr == nd_defrouter.lh_first) + deldr = dr; /* The router is primary. */ + + LIST_REMOVE(dr, dr_entry); + + /* + * 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; + if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) + pfxrtr_del(pfxrtr); + } + pfxlist_onlink_check(); + + /* + * If the router is the primary one, delete the default route + * entry in the routing table. + */ + if (deldr) + defrouter_delreq(deldr, 0); + free(dr, M_IP6NDP); +} + +static struct nd_defrouter * +defrtrlist_update(new) + struct nd_defrouter *new; +{ + struct nd_defrouter *dr, *n; + int s = splnet(); + + if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { + /* entry exists */ + if (new->rtlifetime == 0) { + defrtrlist_del(dr); + dr = NULL; + } else { + /* override */ + dr->flags = new->flags; /* xxx flag check */ + dr->rtlifetime = new->rtlifetime; + dr->expire = new->expire; + } + splx(s); + return(dr); + } + + /* entry does not exist */ + if (new->rtlifetime == 0) { + splx(s); + return(NULL); + } + + n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT); + if (n == NULL) { + splx(s); + return(NULL); + } + bzero(n, sizeof(*n)); + *n = *new; + if (nd_defrouter.lh_first == NULL) { + LIST_INSERT_HEAD(&nd_defrouter, n, dr_entry); + defrouter_addreq(n); + } else { + LIST_INSERT_AFTER(nd_defrouter.lh_first, n, dr_entry); + defrouter_addreq(n); + } + splx(s); + + return(n); +} + +static struct nd_pfxrouter * +pfxrtr_lookup(pr, dr) + struct nd_prefix *pr; + struct nd_defrouter *dr; +{ + struct nd_pfxrouter *search; + + for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { + if (search->router == dr) + break; + } + + return(search); +} + +static void +pfxrtr_add(pr, dr) + struct nd_prefix *pr; + struct nd_defrouter *dr; +{ + struct nd_pfxrouter *new; + + new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); + if (new == NULL) + return; + bzero(new, sizeof(*new)); + new->router = dr; + + LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); + + pfxlist_onlink_check(); +} + +static void +pfxrtr_del(pfr) + struct nd_pfxrouter *pfr; +{ + LIST_REMOVE(pfr, pfr_entry); + free(pfr, M_IP6NDP); +} + +static struct nd_prefix * +prefix_lookup(pr) + struct nd_prefix *pr; +{ + struct nd_prefix *search; + + for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { + if (pr->ndpr_ifp == search->ndpr_ifp && + pr->ndpr_plen == search->ndpr_plen && + in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, + &search->ndpr_prefix.sin6_addr, + pr->ndpr_plen) + ) { + break; + } + } + + return(search); +} + +static int +prelist_add(pr, dr) + struct nd_prefix *pr; + struct nd_defrouter *dr; +{ + struct nd_prefix *new; + int i, s; + + new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); + if (new == NULL) + return ENOMEM; + bzero(new, sizeof(*new)); + *new = *pr; + + /* initilization */ + new->ndpr_statef_onlink = pr->ndpr_statef_onlink; + 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]; + + /* xxx ND_OPT_PI_FLAG_ONLINK processing */ + + s = splnet(); + /* link ndpr_entry to nd_prefix list */ + LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); + splx(s); + + if (dr) + pfxrtr_add(new, dr); + + return 0; +} + +void +prelist_remove(pr) + struct nd_prefix *pr; +{ + struct nd_pfxrouter *pfr, *next; + int s; + + s = splnet(); + /* unlink ndpr_entry from nd_prefix list */ + LIST_REMOVE(pr, ndpr_entry); + splx(s); + + /* free list of routers that adversed the prefix */ + for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { + next = pfr->pfr_next; + + free(pfr, M_IP6NDP); + } + free(pr, M_IP6NDP); + + pfxlist_onlink_check(); +} + +/* + * NOTE: We set address lifetime to keep + * address lifetime <= prefix lifetime + * invariant. This is to simplify on-link determination code. + * If onlink determination is udated, this routine may have to be updated too. + */ +int +prelist_update(new, dr, m) + struct nd_prefix *new; + struct nd_defrouter *dr; /* may be NULL */ + struct mbuf *m; +{ + struct in6_ifaddr *ia6 = NULL; + struct nd_prefix *pr; + int s = splnet(); + int error = 0; + int auth; + struct in6_addrlifetime *lt6; + + 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) ? 1 : 0; +#endif + } + + if ((pr = prefix_lookup(new)) != NULL) { + if (pr->ndpr_ifp != new->ndpr_ifp) { + error = EADDRNOTAVAIL; + goto end; + } + /* update prefix information */ + pr->ndpr_flags = new->ndpr_flags; + pr->ndpr_vltime = new->ndpr_vltime; + pr->ndpr_pltime = new->ndpr_pltime; + pr->ndpr_preferred = new->ndpr_preferred; + pr->ndpr_expire = new->ndpr_expire; + + /* + * RFC 2462 5.5.3 (d) or (e) + * We got a prefix which we have seen in the past. + */ + if (!new->ndpr_raf_auto) + goto noautoconf1; + + if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) + ia6 = NULL; + else + ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr); + + if (ia6 == NULL) { + /* + * Special case: + * (1) We have seen the prefix advertised before, but + * we have never performed autoconfig for this prefix. + * This is because Autonomous bit was 0 previously, or + * autoconfig failed due to some other reasons. + * (2) We have seen the prefix advertised before and + * we have performed autoconfig in the past, but + * we seem to have no interface address right now. + * This is because the interface address have expired. + * + * This prefix is fresh, with respect to autoconfig + * process. + * + * Add an address based on RFC 2462 5.5.3 (d). + */ + ia6 = in6_ifadd(pr->ndpr_ifp, + &pr->ndpr_prefix.sin6_addr, &pr->ndpr_addr, + new->ndpr_plen); + if (!ia6) { + error = EADDRNOTAVAIL; + log(LOG_ERR, "prelist_update: failed to add a " + "new address\n"); + goto noautoconf1; + } + + lt6 = &ia6->ia6_lifetime; + + /* address lifetime <= prefix lifetime */ + lt6->ia6t_vltime = new->ndpr_vltime; + lt6->ia6t_pltime = new->ndpr_pltime; + in6_init_address_ltimes(new, lt6); + } else { +#define TWOHOUR (120*60) + /* + * We have seen the prefix before, and we have added + * interface address in the past. We still have + * the interface address assigned. + * + * update address lifetime based on RFC 2462 + * 5.5.3 (e). + */ + int update = 0; + + lt6 = &ia6->ia6_lifetime; + + /* + * update to RFC 2462 5.5.3 (e) from Jim Bound, + * (ipng 6712) + */ + if (TWOHOUR < new->ndpr_vltime + || lt6->ia6t_vltime < new->ndpr_vltime) { + lt6->ia6t_vltime = new->ndpr_vltime; + update++; + } else if (auth) { + lt6->ia6t_vltime = new->ndpr_vltime; + update++; + } + + /* jim bound rule is not imposed for pref lifetime */ + lt6->ia6t_pltime = new->ndpr_pltime; + + update++; + if (update) + in6_init_address_ltimes(new, lt6); + } + + noautoconf1: + + if (dr && pfxrtr_lookup(pr, dr) == NULL) + pfxrtr_add(pr, dr); + } else { + int error_tmp; + + if (new->ndpr_vltime == 0) goto end; + + bzero(&new->ndpr_addr, sizeof(struct in6_addr)); + + /* + * RFC 2462 5.5.3 (d) + * We got a fresh prefix. Perform some sanity checks + * and add an interface address by appending interface ID + * to the advertised prefix. + */ + if (!new->ndpr_raf_auto) + goto noautoconf2; + + ia6 = in6_ifadd(new->ndpr_ifp, &new->ndpr_prefix.sin6_addr, + &new->ndpr_addr, new->ndpr_plen); + if (!ia6) { + error = EADDRNOTAVAIL; + log(LOG_ERR, "prelist_update: " + "failed to add a new address\n"); + goto noautoconf2; + } + /* set onlink bit if an interface route is configured */ + new->ndpr_statef_onlink = (ia6->ia_flags & IFA_ROUTE) ? 1 : 0; + + lt6 = &ia6->ia6_lifetime; + + /* address lifetime <= prefix lifetime */ + lt6->ia6t_vltime = new->ndpr_vltime; + lt6->ia6t_pltime = new->ndpr_pltime; + in6_init_address_ltimes(new, lt6); + + noautoconf2: + error_tmp = prelist_add(new, dr); + error = error_tmp ? error_tmp : error; + } + + end: + splx(s); + return error; +} + +/* + * Check if each prefix in the prefix list has at least one available router + * that advertised the prefix. + * 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 + * been 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 availble 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. + */ +static void +pfxlist_onlink_check() +{ + struct nd_prefix *pr; + + for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) + if (pr->ndpr_advrtrs.lh_first) /* pr has an available router */ + break; + + if (pr) { + /* + * There is at least one prefix that has a router. First, + * detach prefixes which has no advertising router and then + * attach other prefixes. The order is important since an + * attached prefix and a detached prefix may have a same + * interface route. + */ + for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { + if (pr->ndpr_advrtrs.lh_first == NULL && + pr->ndpr_statef_onlink) { + pr->ndpr_statef_onlink = 0; + nd6_detach_prefix(pr); + } + } + for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { + if (pr->ndpr_advrtrs.lh_first && + pr->ndpr_statef_onlink == 0) + nd6_attach_prefix(pr); + } + } else { + /* there is no prefix that has a router */ + for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) + if (pr->ndpr_statef_onlink == 0) + nd6_attach_prefix(pr); + } +} + +static void +nd6_detach_prefix(pr) + struct nd_prefix *pr; +{ + struct in6_ifaddr *ia6; + struct sockaddr_in6 sa6, mask6; + + /* + * Delete the interface route associated with the prefix. + */ + bzero(&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)); + bzero(&mask6, sizeof(mask6)); + mask6.sin6_family = AF_INET6; + mask6.sin6_len = sizeof(sa6); + bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); + { + int e; + + e = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, + (struct sockaddr *)&mask6, 0, NULL); + if (e) { + log(LOG_ERR, + "nd6_detach_prefix: failed to delete route: " + "%s/%d (errno = %d)\n", + ip6_sprintf(&sa6.sin6_addr), + pr->ndpr_plen, + e); + } + } + + /* + * Mark the address derived from the prefix detached so that + * it won't be used as a source address for a new connection. + */ + if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) + ia6 = NULL; + else + ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr); + if (ia6) + ia6->ia6_flags |= IN6_IFF_DETACHED; +} + +static void +nd6_attach_prefix(pr) + struct nd_prefix *pr; +{ + struct ifaddr *ifa; + struct in6_ifaddr *ia6; + + /* + * Add the interface route associated with the prefix(if necessary) + * Should we consider if the L bit is set in pr->ndpr_flags? + */ + ifa = ifaof_ifpforaddr((struct sockaddr *)&pr->ndpr_prefix, + pr->ndpr_ifp); + if (ifa == NULL) { + log(LOG_ERR, + "nd6_attach_prefix: failed to find any ifaddr" + " to add route for a prefix(%s/%d)\n", + ip6_sprintf(&pr->ndpr_addr), pr->ndpr_plen); + } else { + int e; + struct sockaddr_in6 mask6; + + bzero(&mask6, sizeof(mask6)); + mask6.sin6_family = AF_INET6; + mask6.sin6_len = sizeof(mask6); + mask6.sin6_addr = pr->ndpr_mask; + e = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, + ifa->ifa_addr, (struct sockaddr *)&mask6, + ifa->ifa_flags, NULL); + if (e == 0) + pr->ndpr_statef_onlink = 1; + else { + log(LOG_ERR, + "nd6_attach_prefix: failed to add route for" + " a prefix(%s/%d), errno = %d\n", + ip6_sprintf(&pr->ndpr_addr), pr->ndpr_plen, e); + } + } + + /* + * Now the address derived from the prefix can be used as a source + * for a new connection, so clear the detached flag. + */ + if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) + ia6 = NULL; + else + ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr); + if (ia6) { + ia6->ia6_flags &= ~IN6_IFF_DETACHED; + if (pr->ndpr_statef_onlink) + ia6->ia_flags |= IFA_ROUTE; + } +} + +static struct in6_ifaddr * +in6_ifadd(ifp, in6, addr, prefixlen) + struct ifnet *ifp; + struct in6_addr *in6; + struct in6_addr *addr; + int prefixlen; /* prefix len of the new prefix in "in6" */ +{ + struct ifaddr *ifa; + struct in6_ifaddr *ia, *ib, *oia; + int s, error; + struct in6_addr mask; + + in6_len2mask(&mask, prefixlen); + + /* find link-local address (will be interface ID) */ + ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp); + if (ifa) + ib = (struct in6_ifaddr *)ifa; + else + return NULL; + + /* prefixlen + ifidlen must be equal to 128 */ + if (prefixlen != in6_mask2len(&ib->ia_prefixmask.sin6_addr)) { + log(LOG_ERR, "in6_ifadd: wrong prefixlen for %s" + "(prefix=%d ifid=%d)\n", if_name(ifp), + prefixlen, + 128 - in6_mask2len(&ib->ia_prefixmask.sin6_addr)); + return NULL; + } + + /* make ifaddr */ + ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_DONTWAIT); + if (ia == NULL) { + printf("ENOBUFS in in6_ifadd %d\n", __LINE__); + return NULL; + } + + bzero((caddr_t)ia, sizeof(*ia)); + ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; + ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; + ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; + ia->ia_ifp = ifp; + + /* link to in6_ifaddr */ + if ((oia = in6_ifaddr) != NULL) { + for( ; oia->ia_next; oia = oia->ia_next) + continue; + oia->ia_next = ia; + } else + in6_ifaddr = ia; + + /* link to if_addrlist */ + if (ifp->if_addrlist.tqh_first != NULL) { + TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia, + ifa_list); + } + + /* new address */ + ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6); + ia->ia_addr.sin6_family = AF_INET6; + /* prefix */ + bcopy(in6, &ia->ia_addr.sin6_addr, sizeof(ia->ia_addr.sin6_addr)); + ia->ia_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; + ia->ia_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; + ia->ia_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; + ia->ia_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; + /* interface ID */ + ia->ia_addr.sin6_addr.s6_addr32[0] + |= (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]); + ia->ia_addr.sin6_addr.s6_addr32[1] + |= (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]); + ia->ia_addr.sin6_addr.s6_addr32[2] + |= (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]); + ia->ia_addr.sin6_addr.s6_addr32[3] + |= (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]); + + /* new prefix */ + ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); + ia->ia_prefixmask.sin6_family = AF_INET6; + bcopy(&mask, &ia->ia_prefixmask.sin6_addr, + sizeof(ia->ia_prefixmask.sin6_addr)); + + /* same routine */ + ia->ia_ifa.ifa_rtrequest = + (ifp->if_type == IFT_PPP) ? nd6_p2p_rtrequest : nd6_rtrequest; + ia->ia_ifa.ifa_flags |= RTF_CLONING; + ia->ia_ifa.ifa_metric = ifp->if_metric; + + /* add interface route */ + if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP|RTF_CLONING))) { + log(LOG_NOTICE, "in6_ifadd: failed to add an interface route " + "for %s/%d on %s, errno = %d\n", + ip6_sprintf(&ia->ia_addr.sin6_addr), prefixlen, + if_name(ifp), error); + } else + ia->ia_flags |= IFA_ROUTE; + + *addr = ia->ia_addr.sin6_addr; + + if (ifp->if_flags & IFF_MULTICAST) { + int error; /* not used */ + struct in6_addr sol6; + + /* join solicited node multicast address */ + bzero(&sol6, sizeof(sol6)); + sol6.s6_addr16[0] = htons(0xff02); + sol6.s6_addr16[1] = htons(ifp->if_index); + sol6.s6_addr32[1] = 0; + sol6.s6_addr32[2] = htonl(1); + sol6.s6_addr32[3] = ia->ia_addr.sin6_addr.s6_addr32[3]; + sol6.s6_addr8[12] = 0xff; + (void)in6_addmulti(&sol6, ifp, &error); + } + + ia->ia6_flags |= IN6_IFF_TENTATIVE; + + /* + * To make the interface up. Only AF_INET6 in ia is used... + */ + s = splimp(); + if (ifp->if_ioctl && (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia)) { + splx(s); + return NULL; + } + splx(s); + + /* Perform DAD, if needed. */ + nd6_dad_start((struct ifaddr *)ia, NULL); + + return ia; +} + +int +in6_ifdel(ifp, in6) + struct ifnet *ifp; + struct in6_addr *in6; +{ + struct in6_ifaddr *ia = (struct in6_ifaddr *)NULL; + struct in6_ifaddr *oia = (struct in6_ifaddr *)NULL; + + if (!ifp) + return -1; + + ia = in6ifa_ifpwithaddr(ifp, in6); + if (!ia) + return -1; + + if (ifp->if_flags & IFF_MULTICAST) { + /* + * delete solicited multicast addr for deleting host id + */ + struct in6_multi *in6m; + struct in6_addr llsol; + bzero(&llsol, sizeof(struct in6_addr)); + llsol.s6_addr16[0] = htons(0xff02); + llsol.s6_addr16[1] = htons(ifp->if_index); + llsol.s6_addr32[1] = 0; + llsol.s6_addr32[2] = htonl(1); + llsol.s6_addr32[3] = + ia->ia_addr.sin6_addr.s6_addr32[3]; + llsol.s6_addr8[12] = 0xff; + + IN6_LOOKUP_MULTI(llsol, ifp, in6m); + if (in6m) + in6_delmulti(in6m); + } + + if (ia->ia_flags & IFA_ROUTE) { + rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); + ia->ia_flags &= ~IFA_ROUTE; + } + + TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); + + /* lladdr is never deleted */ + oia = ia; + if (oia == (ia = in6_ifaddr)) + in6_ifaddr = ia->ia_next; + else { + while (ia->ia_next && (ia->ia_next != oia)) + ia = ia->ia_next; + if (ia->ia_next) + ia->ia_next = oia->ia_next; + else + return -1; + } + + IFAFREE((&oia->ia_ifa)); +/* xxx + rtrequest(RTM_DELETE, + (struct sockaddr *)&ia->ia_addr, + (struct sockaddr *)0 + (struct sockaddr *)&ia->ia_prefixmask, + RTF_UP|RTF_CLONING, + (struct rtentry **)0); +*/ + return 0; +} + +int +in6_init_prefix_ltimes(struct nd_prefix *ndpr) +{ + + /* check if preferred lifetime > valid lifetime */ + if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { + log(LOG_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 = time_second + ndpr->ndpr_pltime; + if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) + ndpr->ndpr_expire = 0; + else + ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime; + + return 0; +} + +static void +in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) +{ + + /* init ia6t_expire */ + if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) + lt6->ia6t_expire = 0; + else { + lt6->ia6t_expire = time_second; + lt6->ia6t_expire += lt6->ia6t_vltime; + } + /* init ia6t_preferred */ + if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) + lt6->ia6t_preferred = 0; + else { + lt6->ia6t_preferred = time_second; + lt6->ia6t_preferred += lt6->ia6t_pltime; + } + /* ensure addr lifetime <= prefix lifetime */ + if (new->ndpr_expire && lt6->ia6t_expire && + new->ndpr_expire < lt6->ia6t_expire) + lt6->ia6t_expire = new->ndpr_expire; + if (new->ndpr_preferred && lt6->ia6t_preferred + && new->ndpr_preferred < lt6->ia6t_preferred) + lt6->ia6t_preferred = new->ndpr_preferred; +} + +/* + * 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. + */ +void +rt6_flush(gateway, ifp) + struct in6_addr *gateway; + struct ifnet *ifp; +{ + struct radix_node_head *rnh = rt_tables[AF_INET6]; + int s = splnet(); + + /* We'll care only link-local addresses */ + if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { + splx(s); + return; + } + /* XXX: hack for KAME's link-local address kludge */ + gateway->s6_addr16[1] = htons(ifp->if_index); + + rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); + splx(s); +} + +static int +rt6_deleteroute(rn, arg) + struct radix_node *rn; + void *arg; +{ +#define SIN6(s) ((struct sockaddr_in6 *)s) + struct rtentry *rt = (struct rtentry *)rn; + struct in6_addr *gate = (struct in6_addr *)arg; + + if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) + return(0); + + if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) + return(0); + + /* + * We delete only host route. This means, in particular, we don't + * delete default route. + */ + if ((rt->rt_flags & RTF_HOST) == 0) + return(0); + + return(rtrequest(RTM_DELETE, rt_key(rt), + rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0)); +#undef SIN6 +} |
