/* $NetBSD: in6.c,v 1.157 2011/02/06 19:12:55 dyoung Exp $ */ /* $KAME: in6.c,v 1.198 2001/07/18 09:12:38 itojun Exp $ */ /* * 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. */ /* * Copyright (c) 1982, 1986, 1991, 1993 * The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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. * * @(#)in.c 8.2 (Berkeley) 11/15/93 */ #include __KERNEL_RCSID(0, "$NetBSD: in6.c,v 1.157 2011/02/06 19:12:55 dyoung Exp $"); #include "opt_inet.h" #include "opt_pfil_hooks.h" #include "opt_compat_netbsd.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef PFIL_HOOKS #include #endif #ifdef COMPAT_50 #include #endif MALLOC_DEFINE(M_IP6OPT, "ip6_options", "IPv6 options"); /* enable backward compatibility code for obsoleted ioctls */ #define COMPAT_IN6IFIOCTL #ifdef IN6_DEBUG #define IN6_DPRINTF(__fmt, ...) printf(__fmt, __VA_ARGS__) #else #define IN6_DPRINTF(__fmt, ...) do { } while (/*CONSTCOND*/0) #endif /* IN6_DEBUG */ /* * Definitions of some constant IP6 addresses. */ const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; const struct in6_addr in6addr_nodelocal_allnodes = IN6ADDR_NODELOCAL_ALLNODES_INIT; const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; const struct in6_addr in6mask0 = IN6MASK0; const struct in6_addr in6mask32 = IN6MASK32; const struct in6_addr in6mask64 = IN6MASK64; const struct in6_addr in6mask96 = IN6MASK96; const struct in6_addr in6mask128 = IN6MASK128; const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0}; static int in6_lifaddr_ioctl(struct socket *, u_long, void *, struct ifnet *, struct lwp *); static int in6_ifinit(struct ifnet *, struct in6_ifaddr *, const struct sockaddr_in6 *, int); static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); /* * Subroutine for in6_ifaddloop() and in6_ifremloop(). * This routine does actual work. */ static void in6_ifloop_request(int cmd, struct ifaddr *ifa) { struct sockaddr_in6 lo_sa; struct sockaddr_in6 all1_sa; struct rtentry *nrt = NULL; int e; sockaddr_in6_init(&all1_sa, &in6mask128, 0, 0, 0); sockaddr_in6_init(&lo_sa, &in6addr_loopback, 0, 0, 0); /* * We specify the address itself as the gateway, and set the * RTF_LLINFO flag, so that the corresponding host route would have * the flag, and thus applications that assume traditional behavior * would be happy. Note that we assume the caller of the function * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest, * which changes the outgoing interface to the loopback interface. */ e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr, (struct sockaddr *)&all1_sa, RTF_UP|RTF_HOST|RTF_LLINFO, &nrt); if (e != 0) { log(LOG_ERR, "in6_ifloop_request: " "%s operation failed for %s (errno=%d)\n", cmd == RTM_ADD ? "ADD" : "DELETE", ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), e); } /* * Make sure rt_ifa be equal to IFA, the second argument of the * function. * We need this because when we refer to rt_ifa->ia6_flags in * ip6_input, we assume that the rt_ifa points to the address instead * of the loopback address. */ if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa) rt_replace_ifa(nrt, ifa); /* * Report the addition/removal of the address to the routing socket. * XXX: since we called rtinit for a p2p interface with a destination, * we end up reporting twice in such a case. Should we rather * omit the second report? */ if (nrt) { rt_newaddrmsg(cmd, ifa, e, nrt); if (cmd == RTM_DELETE) { if (nrt->rt_refcnt <= 0) { /* XXX: we should free the entry ourselves. */ nrt->rt_refcnt++; rtfree(nrt); } } else { /* the cmd must be RTM_ADD here */ nrt->rt_refcnt--; } } } /* * Add ownaddr as loopback rtentry. We previously add the route only if * necessary (ex. on a p2p link). However, since we now manage addresses * separately from prefixes, we should always add the route. We can't * rely on the cloning mechanism from the corresponding interface route * any more. */ void in6_ifaddloop(struct ifaddr *ifa) { struct rtentry *rt; /* If there is no loopback entry, allocate one. */ rt = rtalloc1(ifa->ifa_addr, 0); if (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 || (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) in6_ifloop_request(RTM_ADD, ifa); if (rt != NULL) rt->rt_refcnt--; } /* * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), * if it exists. */ void in6_ifremloop(struct ifaddr *ifa) { struct in6_ifaddr *alt_ia = NULL, *ia; struct rtentry *rt; int ia_count = 0; /* * Some of BSD variants do not remove cloned routes * from an interface direct route, when removing the direct route * (see comments in net/net_osdep.h). Even for variants that do remove * cloned routes, they could fail to remove the cloned routes when * we handle multple addresses that share a common prefix. * So, we should remove the route corresponding to the deleted address. */ /* * Delete the entry only if exactly one ifaddr matches the * address, ifa->ifa_addr. * * If more than one ifaddr matches, replace the ifaddr in * the routing table, rt_ifa, with a different ifaddr than * the one we are purging, ifa. It is important to do * this, or else the routing table can accumulate dangling * pointers rt->rt_ifa->ifa_ifp to destroyed interfaces, * which will lead to crashes, later. (More than one ifaddr * can match if we assign the same address to multiple---probably * p2p---interfaces.) * * XXX An old comment at this place said, "we should avoid * XXX such a configuration [i.e., interfaces with the same * XXX addressed assigned --ed.] in IPv6...". I do not * XXX agree, especially now that I have fixed the dangling * XXX ifp-pointers bug. */ for (ia = in6_ifaddr; ia; ia = ia->ia_next) { if (!IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) continue; if (ia->ia_ifp != ifa->ifa_ifp) alt_ia = ia; if (++ia_count > 1 && alt_ia != NULL) break; } if (ia_count == 0) return; if ((rt = rtalloc1(ifa->ifa_addr, 0)) == NULL) return; rt->rt_refcnt--; /* * Before deleting, check if a corresponding loopbacked * host route surely exists. With this check, we can avoid * deleting an interface direct route whose destination is * the same as the address being removed. This can happen * when removing a subnet-router anycast address on an * interface attached to a shared medium. */ if ((rt->rt_flags & RTF_HOST) == 0 || (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) return; /* If we cannot replace the route's ifaddr with the equivalent * ifaddr of another interface, I believe it is safest to * delete the route. */ if (ia_count == 1 || alt_ia == NULL) in6_ifloop_request(RTM_DELETE, ifa); else rt_replace_ifa(rt, &alt_ia->ia_ifa); } int in6_mask2len(struct in6_addr *mask, u_char *lim0) { int x = 0, y; u_char *lim = lim0, *p; /* ignore the scope_id part */ if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) lim = (u_char *)mask + sizeof(*mask); for (p = (u_char *)mask; p < lim; x++, p++) { if (*p != 0xff) break; } y = 0; if (p < lim) { for (y = 0; y < NBBY; y++) { if ((*p & (0x80 >> y)) == 0) break; } } /* * when the limit pointer is given, do a stricter check on the * remaining bits. */ if (p < lim) { if (y != 0 && (*p & (0x00ff >> y)) != 0) return -1; for (p = p + 1; p < lim; p++) if (*p != 0) return -1; } return x * NBBY + y; } #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) #define ia62ifa(ia6) (&((ia6)->ia_ifa)) static int in6_control1(struct socket *so, u_long cmd, void *data, struct ifnet *ifp, lwp_t *l) { struct in6_ifreq *ifr = (struct in6_ifreq *)data; struct in6_ifaddr *ia = NULL; struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; struct sockaddr_in6 *sa6; int error; switch (cmd) { /* * XXX: Fix me, once we fix SIOCSIFADDR, SIOCIFDSTADDR, etc. */ case SIOCSIFADDR: case SIOCSIFDSTADDR: #ifdef SIOCSIFCONF_X25 case SIOCSIFCONF_X25: #endif return EOPNOTSUPP; case SIOCGETSGCNT_IN6: case SIOCGETMIFCNT_IN6: return mrt6_ioctl(cmd, data); case SIOCGIFADDRPREF: case SIOCSIFADDRPREF: if (ifp == NULL) return EINVAL; return ifaddrpref_ioctl(so, cmd, data, ifp, l); } if (ifp == NULL) return EOPNOTSUPP; switch (cmd) { case SIOCSNDFLUSH_IN6: case SIOCSPFXFLUSH_IN6: case SIOCSRTRFLUSH_IN6: case SIOCSDEFIFACE_IN6: case SIOCSIFINFO_FLAGS: case SIOCSIFINFO_IN6: /* Privileged. */ /* FALLTHROUGH */ case OSIOCGIFINFO_IN6: case SIOCGIFINFO_IN6: case SIOCGDRLST_IN6: case SIOCGPRLST_IN6: case SIOCGNBRINFO_IN6: case SIOCGDEFIFACE_IN6: return nd6_ioctl(cmd, data, ifp); } switch (cmd) { case SIOCSIFPREFIX_IN6: case SIOCDIFPREFIX_IN6: case SIOCAIFPREFIX_IN6: case SIOCCIFPREFIX_IN6: case SIOCSGIFPREFIX_IN6: case SIOCGIFPREFIX_IN6: log(LOG_NOTICE, "prefix ioctls are now invalidated. " "please use ifconfig.\n"); return EOPNOTSUPP; } switch (cmd) { case SIOCALIFADDR: case SIOCDLIFADDR: /* Privileged. */ /* FALLTHROUGH */ case SIOCGLIFADDR: return in6_lifaddr_ioctl(so, cmd, data, ifp, l); } /* * Find address for this interface, if it exists. * * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation * only, and used the first interface address as the target of other * operations (without checking ifra_addr). This was because netinet * code/API assumed at most 1 interface address per interface. * Since IPv6 allows a node to assign multiple addresses * on a single interface, we almost always look and check the * presence of ifra_addr, and reject invalid ones here. * It also decreases duplicated code among SIOC*_IN6 operations. */ switch (cmd) { case SIOCAIFADDR_IN6: #ifdef OSIOCAIFADDR_IN6 case OSIOCAIFADDR_IN6: #endif #ifdef OSIOCSIFPHYADDR_IN6 case OSIOCSIFPHYADDR_IN6: #endif case SIOCSIFPHYADDR_IN6: sa6 = &ifra->ifra_addr; break; case SIOCSIFADDR_IN6: case SIOCGIFADDR_IN6: case SIOCSIFDSTADDR_IN6: case SIOCSIFNETMASK_IN6: case SIOCGIFDSTADDR_IN6: case SIOCGIFNETMASK_IN6: case SIOCDIFADDR_IN6: case SIOCGIFPSRCADDR_IN6: case SIOCGIFPDSTADDR_IN6: case SIOCGIFAFLAG_IN6: case SIOCSNDFLUSH_IN6: case SIOCSPFXFLUSH_IN6: case SIOCSRTRFLUSH_IN6: case SIOCGIFALIFETIME_IN6: #ifdef OSIOCGIFALIFETIME_IN6 case OSIOCGIFALIFETIME_IN6: #endif case SIOCGIFSTAT_IN6: case SIOCGIFSTAT_ICMP6: sa6 = &ifr->ifr_addr; break; default: sa6 = NULL; break; } if (sa6 && sa6->sin6_family == AF_INET6) { if (sa6->sin6_scope_id != 0) error = sa6_embedscope(sa6, 0); else error = in6_setscope(&sa6->sin6_addr, ifp, NULL); if (error != 0) return error; ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); } else ia = NULL; switch (cmd) { case SIOCSIFADDR_IN6: case SIOCSIFDSTADDR_IN6: case SIOCSIFNETMASK_IN6: /* * Since IPv6 allows a node to assign multiple addresses * on a single interface, SIOCSIFxxx ioctls are deprecated. */ return EINVAL; case SIOCDIFADDR_IN6: /* * for IPv4, we look for existing in_ifaddr here to allow * "ifconfig if0 delete" to remove the first IPv4 address on * the interface. For IPv6, as the spec allows multiple * interface address from the day one, we consider "remove the * first one" semantics to be not preferable. */ if (ia == NULL) return EADDRNOTAVAIL; /* FALLTHROUGH */ #ifdef OSIOCAIFADDR_IN6 case OSIOCAIFADDR_IN6: #endif case SIOCAIFADDR_IN6: /* * We always require users to specify a valid IPv6 address for * the corresponding operation. */ if (ifra->ifra_addr.sin6_family != AF_INET6 || ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) return EAFNOSUPPORT; /* Privileged. */ break; case SIOCGIFADDR_IN6: /* This interface is basically deprecated. use SIOCGIFCONF. */ /* FALLTHROUGH */ case SIOCGIFAFLAG_IN6: case SIOCGIFNETMASK_IN6: case SIOCGIFDSTADDR_IN6: case SIOCGIFALIFETIME_IN6: #ifdef OSIOCGIFALIFETIME_IN6 case OSIOCGIFALIFETIME_IN6: #endif /* must think again about its semantics */ if (ia == NULL) return EADDRNOTAVAIL; break; } switch (cmd) { case SIOCGIFADDR_IN6: ifr->ifr_addr = ia->ia_addr; if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) return error; break; case SIOCGIFDSTADDR_IN6: if ((ifp->if_flags & IFF_POINTOPOINT) == 0) return EINVAL; /* * XXX: should we check if ifa_dstaddr is NULL and return * an error? */ ifr->ifr_dstaddr = ia->ia_dstaddr; if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) return error; break; case SIOCGIFNETMASK_IN6: ifr->ifr_addr = ia->ia_prefixmask; break; case SIOCGIFAFLAG_IN6: ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; break; case SIOCGIFSTAT_IN6: if (ifp == NULL) return EINVAL; memset(&ifr->ifr_ifru.ifru_stat, 0, sizeof(ifr->ifr_ifru.ifru_stat)); ifr->ifr_ifru.ifru_stat = *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; break; case SIOCGIFSTAT_ICMP6: if (ifp == NULL) return EINVAL; memset(&ifr->ifr_ifru.ifru_icmp6stat, 0, sizeof(ifr->ifr_ifru.ifru_icmp6stat)); ifr->ifr_ifru.ifru_icmp6stat = *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; break; #ifdef OSIOCGIFALIFETIME_IN6 case OSIOCGIFALIFETIME_IN6: #endif case SIOCGIFALIFETIME_IN6: ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { time_t maxexpire; struct in6_addrlifetime *retlt = &ifr->ifr_ifru.ifru_lifetime; /* * XXX: adjust expiration time assuming time_t is * signed. */ maxexpire = ((time_t)~0) & ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); if (ia->ia6_lifetime.ia6t_vltime < maxexpire - ia->ia6_updatetime) { retlt->ia6t_expire = ia->ia6_updatetime + ia->ia6_lifetime.ia6t_vltime; } else retlt->ia6t_expire = maxexpire; } if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { time_t maxexpire; struct in6_addrlifetime *retlt = &ifr->ifr_ifru.ifru_lifetime; /* * XXX: adjust expiration time assuming time_t is * signed. */ maxexpire = ((time_t)~0) & ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); if (ia->ia6_lifetime.ia6t_pltime < maxexpire - ia->ia6_updatetime) { retlt->ia6t_preferred = ia->ia6_updatetime + ia->ia6_lifetime.ia6t_pltime; } else retlt->ia6t_preferred = maxexpire; } #ifdef OSIOCFIFALIFETIME_IN6 if (cmd == OSIOCFIFALIFETIME_IN6) in6_addrlifetime_to_in6_addrlifetime50( &ifr->ifru.ifru_lifetime); #endif break; #ifdef OSIOCAIFADDR_IN6 case OSIOCAIFADDR_IN6: in6_aliasreq50_to_in6_aliasreq(ifra); /*FALLTHROUGH*/ #endif case SIOCAIFADDR_IN6: { int i; struct nd_prefixctl pr0; struct nd_prefix *pr; /* reject read-only flags */ if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 || (ifra->ifra_flags & IN6_IFF_DETACHED) != 0 || (ifra->ifra_flags & IN6_IFF_NODAD) != 0 || (ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0) { return EINVAL; } /* * first, make or update the interface address structure, * and link it to the list. */ if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) return error; if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) == NULL) { /* * this can happen when the user specify the 0 valid * lifetime. */ break; } /* * then, make the prefix on-link on the interface. * XXX: we'd rather create the prefix before the address, but * we need at least one address to install the corresponding * interface route, so we configure the address first. */ /* * convert mask to prefix length (prefixmask has already * been validated in in6_update_ifa(). */ memset(&pr0, 0, sizeof(pr0)); pr0.ndpr_ifp = ifp; pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, NULL); if (pr0.ndpr_plen == 128) { break; /* we don't need to install a host route. */ } pr0.ndpr_prefix = ifra->ifra_addr; /* apply the mask for safety. */ for (i = 0; i < 4; i++) { pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; } /* * XXX: since we don't have an API to set prefix (not address) * lifetimes, we just use the same lifetimes as addresses. * The (temporarily) installed lifetimes can be overridden by * later advertised RAs (when accept_rtadv is non 0), which is * an intended behavior. */ pr0.ndpr_raf_onlink = 1; /* should be configurable? */ pr0.ndpr_raf_auto = ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; /* add the prefix if not yet. */ if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { /* * nd6_prelist_add will install the corresponding * interface route. */ if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) return error; if (pr == NULL) { log(LOG_ERR, "nd6_prelist_add succeeded but " "no prefix\n"); return EINVAL; /* XXX panic here? */ } } /* relate the address to the prefix */ if (ia->ia6_ndpr == NULL) { ia->ia6_ndpr = pr; pr->ndpr_refcnt++; /* * If this is the first autoconf address from the * prefix, create a temporary address as well * (when required). */ if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && ip6_use_tempaddr && pr->ndpr_refcnt == 1) { int e; if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { log(LOG_NOTICE, "in6_control: failed " "to create a temporary address, " "errno=%d\n", e); } } } /* * this might affect the status of autoconfigured addresses, * that is, this address might make other addresses detached. */ pfxlist_onlink_check(); #ifdef PFIL_HOOKS (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); #endif break; } case SIOCDIFADDR_IN6: { struct nd_prefix *pr; /* * If the address being deleted is the only one that owns * the corresponding prefix, expire the prefix as well. * XXX: theoretically, we don't have to worry about such * relationship, since we separate the address management * and the prefix management. We do this, however, to provide * as much backward compatibility as possible in terms of * the ioctl operation. * Note that in6_purgeaddr() will decrement ndpr_refcnt. */ pr = ia->ia6_ndpr; in6_purgeaddr(&ia->ia_ifa); if (pr && pr->ndpr_refcnt == 0) prelist_remove(pr); #ifdef PFIL_HOOKS (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCDIFADDR_IN6, ifp, PFIL_IFADDR); #endif break; } default: return ENOTTY; } return 0; } int in6_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp, struct lwp *l) { int error, s; switch (cmd) { case SIOCSNDFLUSH_IN6: case SIOCSPFXFLUSH_IN6: case SIOCSRTRFLUSH_IN6: case SIOCSDEFIFACE_IN6: case SIOCSIFINFO_FLAGS: case SIOCSIFINFO_IN6: case SIOCALIFADDR: case SIOCDLIFADDR: case SIOCDIFADDR_IN6: #ifdef OSIOCAIFADDR_IN6 case OSIOCAIFADDR_IN6: #endif case SIOCAIFADDR_IN6: if (l == NULL || kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL)) return EPERM; break; } s = splnet(); error = in6_control1(so , cmd, data, ifp, l); splx(s); return error; } /* * Update parameters of an IPv6 interface address. * If necessary, a new entry is created and linked into address chains. * This function is separated from in6_control(). * XXX: should this be performed under splnet()? */ static int in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra, struct in6_ifaddr *ia, int flags) { int error = 0, hostIsNew = 0, plen = -1; struct in6_ifaddr *oia; struct sockaddr_in6 dst6; struct in6_addrlifetime *lt; struct in6_multi_mship *imm; struct in6_multi *in6m_sol; struct rtentry *rt; int dad_delay; in6m_sol = NULL; /* Validate parameters */ if (ifp == NULL || ifra == NULL) /* this maybe redundant */ return EINVAL; /* * The destination address for a p2p link must have a family * of AF_UNSPEC or AF_INET6. */ if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && ifra->ifra_dstaddr.sin6_family != AF_INET6 && ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) return EAFNOSUPPORT; /* * validate ifra_prefixmask. don't check sin6_family, netmask * does not carry fields other than sin6_len. */ if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) return EINVAL; /* * Because the IPv6 address architecture is classless, we require * users to specify a (non 0) prefix length (mask) for a new address. * We also require the prefix (when specified) mask is valid, and thus * reject a non-consecutive mask. */ if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) return EINVAL; if (ifra->ifra_prefixmask.sin6_len != 0) { plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, (u_char *)&ifra->ifra_prefixmask + ifra->ifra_prefixmask.sin6_len); if (plen <= 0) return EINVAL; } else { /* * In this case, ia must not be NULL. We just use its prefix * length. */ plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); } /* * If the destination address on a p2p interface is specified, * and the address is a scoped one, validate/set the scope * zone identifier. */ dst6 = ifra->ifra_dstaddr; if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && (dst6.sin6_family == AF_INET6)) { struct in6_addr in6_tmp; u_int32_t zoneid; in6_tmp = dst6.sin6_addr; if (in6_setscope(&in6_tmp, ifp, &zoneid)) return EINVAL; /* XXX: should be impossible */ if (dst6.sin6_scope_id != 0) { if (dst6.sin6_scope_id != zoneid) return EINVAL; } else /* user omit to specify the ID. */ dst6.sin6_scope_id = zoneid; /* convert into the internal form */ if (sa6_embedscope(&dst6, 0)) return EINVAL; /* XXX: should be impossible */ } /* * The destination address can be specified only for a p2p or a * loopback interface. If specified, the corresponding prefix length * must be 128. */ if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { #ifdef FORCE_P2PPLEN int i; #endif if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { /* XXX: noisy message */ nd6log((LOG_INFO, "in6_update_ifa: a destination can " "be specified for a p2p or a loopback IF only\n")); return EINVAL; } if (plen != 128) { nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " "be 128 when dstaddr is specified\n")); #ifdef FORCE_P2PPLEN /* * To be compatible with old configurations, * such as ifconfig gif0 inet6 2001::1 2001::2 * prefixlen 126, we override the specified * prefixmask as if the prefix length was 128. */ ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); for (i = 0; i < 4; i++) ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] = 0xffffffff; plen = 128; #else return EINVAL; #endif } } /* lifetime consistency check */ lt = &ifra->ifra_lifetime; if (lt->ia6t_pltime > lt->ia6t_vltime) return EINVAL; if (lt->ia6t_vltime == 0) { /* * the following log might be noisy, but this is a typical * configuration mistake or a tool's bug. */ nd6log((LOG_INFO, "in6_update_ifa: valid lifetime is 0 for %s\n", ip6_sprintf(&ifra->ifra_addr.sin6_addr))); if (ia == NULL) return 0; /* there's nothing to do */ } /* * If this is a new address, allocate a new ifaddr and link it * into chains. */ if (ia == NULL) { hostIsNew = 1; /* * When in6_update_ifa() is called in a process of a received * RA, it is called under an interrupt context. So, we should * call malloc with M_NOWAIT. */ ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, M_NOWAIT); if (ia == NULL) return ENOBUFS; memset(ia, 0, sizeof(*ia)); LIST_INIT(&ia->ia6_memberships); /* Initialize the address and masks, and put time stamp */ ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; ia->ia_addr.sin6_family = AF_INET6; ia->ia_addr.sin6_len = sizeof(ia->ia_addr); ia->ia6_createtime = time_second; if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { /* * XXX: some functions expect that ifa_dstaddr is not * NULL for p2p interfaces. */ ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; } else { ia->ia_ifa.ifa_dstaddr = NULL; } ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; ia->ia_ifp = ifp; if ((oia = in6_ifaddr) != NULL) { for ( ; oia->ia_next; oia = oia->ia_next) continue; oia->ia_next = ia; } else in6_ifaddr = ia; /* gain a refcnt for the link from in6_ifaddr */ IFAREF(&ia->ia_ifa); ifa_insert(ifp, &ia->ia_ifa); } /* update timestamp */ ia->ia6_updatetime = time_second; /* set prefix mask */ if (ifra->ifra_prefixmask.sin6_len) { /* * We prohibit changing the prefix length of an existing * address, because * + such an operation should be rare in IPv6, and * + the operation would confuse prefix management. */ if (ia->ia_prefixmask.sin6_len && in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" " existing (%s) address should not be changed\n", ip6_sprintf(&ia->ia_addr.sin6_addr))); error = EINVAL; goto unlink; } ia->ia_prefixmask = ifra->ifra_prefixmask; } /* * If a new destination address is specified, scrub the old one and * install the new destination. Note that the interface must be * p2p or loopback (see the check above.) */ if (dst6.sin6_family == AF_INET6 && !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { if ((ia->ia_flags & IFA_ROUTE) != 0 && rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0) { nd6log((LOG_ERR, "in6_update_ifa: failed to remove " "a route to the old destination: %s\n", ip6_sprintf(&ia->ia_addr.sin6_addr))); /* proceed anyway... */ } else ia->ia_flags &= ~IFA_ROUTE; ia->ia_dstaddr = dst6; } /* * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred * to see if the address is deprecated or invalidated, but initialize * these members for applications. */ ia->ia6_lifetime = ifra->ifra_lifetime; if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { ia->ia6_lifetime.ia6t_expire = time_second + ia->ia6_lifetime.ia6t_vltime; } else ia->ia6_lifetime.ia6t_expire = 0; if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { ia->ia6_lifetime.ia6t_preferred = time_second + ia->ia6_lifetime.ia6t_pltime; } else ia->ia6_lifetime.ia6t_preferred = 0; /* reset the interface and routing table appropriately. */ if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) goto unlink; /* * configure address flags. */ ia->ia6_flags = ifra->ifra_flags; /* * backward compatibility - if IN6_IFF_DEPRECATED is set from the * userland, make it deprecated. */ if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { ia->ia6_lifetime.ia6t_pltime = 0; ia->ia6_lifetime.ia6t_preferred = time_second; } /* * Make the address tentative before joining multicast addresses, * so that corresponding MLD responses would not have a tentative * source address. */ ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ if (hostIsNew && in6if_do_dad(ifp)) ia->ia6_flags |= IN6_IFF_TENTATIVE; /* * We are done if we have simply modified an existing address. */ if (!hostIsNew) return error; /* * Beyond this point, we should call in6_purgeaddr upon an error, * not just go to unlink. */ /* join necessary multicast groups */ if ((ifp->if_flags & IFF_MULTICAST) != 0) { struct sockaddr_in6 mltaddr, mltmask; struct in6_addr llsol; /* join solicited multicast addr for new host id */ memset(&llsol, 0, sizeof(struct in6_addr)); llsol.s6_addr16[0] = htons(0xff02); llsol.s6_addr32[1] = 0; llsol.s6_addr32[2] = htonl(1); llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; llsol.s6_addr8[12] = 0xff; if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { /* XXX: should not happen */ log(LOG_ERR, "in6_update_ifa: " "in6_setscope failed\n"); goto cleanup; } dad_delay = 0; if ((flags & IN6_IFAUPDATE_DADDELAY)) { /* * We need a random delay for DAD on the address * being configured. It also means delaying * transmission of the corresponding MLD report to * avoid report collision. * [draft-ietf-ipv6-rfc2462bis-02.txt] */ dad_delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); } #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ /* join solicited multicast addr for new host id */ imm = in6_joingroup(ifp, &llsol, &error, dad_delay); if (!imm) { nd6log((LOG_ERR, "in6_update_ifa: addmulti " "failed for %s on %s (errno=%d)\n", ip6_sprintf(&llsol), if_name(ifp), error)); goto cleanup; } LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); in6m_sol = imm->i6mm_maddr; sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0); /* * join link-local all-nodes address */ sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes, 0, 0, 0); if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) goto cleanup; /* XXX: should not fail */ /* * XXX: do we really need this automatic routes? * We should probably reconsider this stuff. Most applications * actually do not need the routes, since they usually specify * the outgoing interface. */ rt = rtalloc1((struct sockaddr *)&mltaddr, 0); if (rt) { if (memcmp(&mltaddr.sin6_addr, &satocsin6(rt_getkey(rt))->sin6_addr, MLTMASK_LEN)) { RTFREE(rt); rt = NULL; } else if (rt->rt_ifp != ifp) { IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " "network %04x:%04x::/32 = %04x:%04x::/32\n", __func__, rt->rt_ifp, ifp, ifp->if_xname, ntohs(mltaddr.sin6_addr.s6_addr16[0]), ntohs(mltaddr.sin6_addr.s6_addr16[1]), satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); rt_replace_ifa(rt, &ia->ia_ifa); rt->rt_ifp = ifp; } } if (!rt) { struct rt_addrinfo info; memset(&info, 0, sizeof(info)); info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr; info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&ia->ia_addr; info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&mltmask; info.rti_info[RTAX_IFA] = (struct sockaddr *)&ia->ia_addr; /* XXX: we need RTF_CLONING to fake nd6_rtrequest */ info.rti_flags = RTF_UP | RTF_CLONING; error = rtrequest1(RTM_ADD, &info, NULL); if (error) goto cleanup; } else { RTFREE(rt); } imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); if (!imm) { nd6log((LOG_WARNING, "in6_update_ifa: addmulti failed for " "%s on %s (errno=%d)\n", ip6_sprintf(&mltaddr.sin6_addr), if_name(ifp), error)); goto cleanup; } LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); /* * join node information group address */ dad_delay = 0; if ((flags & IN6_IFAUPDATE_DADDELAY)) { /* * The spec doesn't say anything about delay for this * group, but the same logic should apply. */ dad_delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); } if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0) ; else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, dad_delay)) == NULL) { /* XXX jinmei */ nd6log((LOG_WARNING, "in6_update_ifa: " "addmulti failed for %s on %s (errno=%d)\n", ip6_sprintf(&mltaddr.sin6_addr), if_name(ifp), error)); /* XXX not very fatal, go on... */ } else { LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); } /* * join interface-local all-nodes address. * (ff01::1%ifN, and ff01::%ifN/32) */ mltaddr.sin6_addr = in6addr_nodelocal_allnodes; if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) goto cleanup; /* XXX: should not fail */ /* XXX: again, do we really need the route? */ rt = rtalloc1((struct sockaddr *)&mltaddr, 0); if (rt) { /* 32bit came from "mltmask" */ if (memcmp(&mltaddr.sin6_addr, &satocsin6(rt_getkey(rt))->sin6_addr, 32 / NBBY)) { RTFREE(rt); rt = NULL; } else if (rt->rt_ifp != ifp) { IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " "network %04x:%04x::/32 = %04x:%04x::/32\n", __func__, rt->rt_ifp, ifp, ifp->if_xname, ntohs(mltaddr.sin6_addr.s6_addr16[0]), ntohs(mltaddr.sin6_addr.s6_addr16[1]), satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); rt_replace_ifa(rt, &ia->ia_ifa); rt->rt_ifp = ifp; } } if (!rt) { struct rt_addrinfo info; memset(&info, 0, sizeof(info)); info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr; info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&ia->ia_addr; info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&mltmask; info.rti_info[RTAX_IFA] = (struct sockaddr *)&ia->ia_addr; info.rti_flags = RTF_UP | RTF_CLONING; error = rtrequest1(RTM_ADD, &info, NULL); if (error) goto cleanup; #undef MLTMASK_LEN } else { RTFREE(rt); } imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); if (!imm) { nd6log((LOG_WARNING, "in6_update_ifa: " "addmulti failed for %s on %s (errno=%d)\n", ip6_sprintf(&mltaddr.sin6_addr), if_name(ifp), error)); goto cleanup; } else { LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); } } /* * Perform DAD, if needed. * XXX It may be of use, if we can administratively * disable DAD. */ if (hostIsNew && in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && (ia->ia6_flags & IN6_IFF_TENTATIVE)) { int mindelay, maxdelay; dad_delay = 0; if ((flags & IN6_IFAUPDATE_DADDELAY)) { /* * We need to impose a delay before sending an NS * for DAD. Check if we also needed a delay for the * corresponding MLD message. If we did, the delay * should be larger than the MLD delay (this could be * relaxed a bit, but this simple logic is at least * safe). */ mindelay = 0; if (in6m_sol != NULL && in6m_sol->in6m_state == MLD_REPORTPENDING) { mindelay = in6m_sol->in6m_timer; } maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; if (maxdelay - mindelay == 0) dad_delay = 0; else { dad_delay = (arc4random() % (maxdelay - mindelay)) + mindelay; } } nd6_dad_start(&ia->ia_ifa, dad_delay); } return error; unlink: /* * XXX: if a change of an existing address failed, keep the entry * anyway. */ if (hostIsNew) in6_unlink_ifa(ia, ifp); return error; cleanup: in6_purgeaddr(&ia->ia_ifa); return error; } int in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, struct in6_ifaddr *ia, int flags) { int rc, s; s = splnet(); rc = in6_update_ifa1(ifp, ifra, ia, flags); splx(s); return rc; } void in6_purgeaddr(struct ifaddr *ifa) { struct ifnet *ifp = ifa->ifa_ifp; struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; struct in6_multi_mship *imm; /* stop DAD processing */ nd6_dad_stop(ifa); /* * delete route to the destination of the address being purged. * The interface must be p2p or loopback in this case. */ if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) { int e; if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) { log(LOG_ERR, "in6_purgeaddr: failed to remove " "a route to the p2p destination: %s on %s, " "errno=%d\n", ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), e); /* proceed anyway... */ } else ia->ia_flags &= ~IFA_ROUTE; } /* Remove ownaddr's loopback rtentry, if it exists. */ in6_ifremloop(&(ia->ia_ifa)); /* * leave from multicast groups we have joined for the interface */ while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { LIST_REMOVE(imm, i6mm_chain); in6_leavegroup(imm); } in6_unlink_ifa(ia, ifp); } static void in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) { struct in6_ifaddr *oia; int s = splnet(); ifa_remove(ifp, &ia->ia_ifa); 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 { /* search failed */ printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); } } /* * XXX thorpej@NetBSD.org -- if the interface is going * XXX away, don't save the multicast entries, delete them! */ if (LIST_EMPTY(&oia->ia6_multiaddrs)) ; else if (oia->ia_ifa.ifa_ifp->if_output == if_nulloutput) { struct in6_multi *in6m, *next; for (in6m = LIST_FIRST(&oia->ia6_multiaddrs); in6m != NULL; in6m = next) { next = LIST_NEXT(in6m, in6m_entry); in6_delmulti(in6m); } } else in6_savemkludge(oia); /* * Release the reference to the base prefix. There should be a * positive reference. */ if (oia->ia6_ndpr == NULL) { nd6log((LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " "%p has no prefix\n", oia)); } else { oia->ia6_ndpr->ndpr_refcnt--; oia->ia6_ndpr = NULL; } /* * Also, if the address being removed is autoconf'ed, call * pfxlist_onlink_check() since the release might affect the status of * other (detached) addresses. */ if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) pfxlist_onlink_check(); /* * release another refcnt for the link from in6_ifaddr. * Note that we should decrement the refcnt at least once for all *BSD. */ IFAFREE(&oia->ia_ifa); splx(s); } void in6_purgeif(struct ifnet *ifp) { if_purgeaddrs(ifp, AF_INET6, in6_purgeaddr); in6_ifdetach(ifp); } /* * SIOC[GAD]LIFADDR. * SIOCGLIFADDR: get first address. (?) * SIOCGLIFADDR with IFLR_PREFIX: * get first address that matches the specified prefix. * SIOCALIFADDR: add the specified address. * SIOCALIFADDR with IFLR_PREFIX: * add the specified prefix, filling hostid part from * the first link-local address. prefixlen must be <= 64. * SIOCDLIFADDR: delete the specified address. * SIOCDLIFADDR with IFLR_PREFIX: * delete the first address that matches the specified prefix. * return values: * EINVAL on invalid parameters * EADDRNOTAVAIL on prefix match failed/specified address not found * other values may be returned from in6_ioctl() * * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. * this is to accommodate address naming scheme other than RFC2374, * in the future. * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 * address encoding scheme. (see figure on page 8) */ static int in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, struct ifnet *ifp, struct lwp *l) { struct in6_ifaddr *ia; struct if_laddrreq *iflr = (struct if_laddrreq *)data; struct ifaddr *ifa; struct sockaddr *sa; /* sanity checks */ if (!data || !ifp) { panic("invalid argument to in6_lifaddr_ioctl"); /* NOTREACHED */ } switch (cmd) { case SIOCGLIFADDR: /* address must be specified on GET with IFLR_PREFIX */ if ((iflr->flags & IFLR_PREFIX) == 0) break; /* FALLTHROUGH */ case SIOCALIFADDR: case SIOCDLIFADDR: /* address must be specified on ADD and DELETE */ sa = (struct sockaddr *)&iflr->addr; if (sa->sa_family != AF_INET6) return EINVAL; if (sa->sa_len != sizeof(struct sockaddr_in6)) return EINVAL; /* XXX need improvement */ sa = (struct sockaddr *)&iflr->dstaddr; if (sa->sa_family && sa->sa_family != AF_INET6) return EINVAL; if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) return EINVAL; break; default: /* shouldn't happen */ #if 0 panic("invalid cmd to in6_lifaddr_ioctl"); /* NOTREACHED */ #else return EOPNOTSUPP; #endif } if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) return EINVAL; switch (cmd) { case SIOCALIFADDR: { struct in6_aliasreq ifra; struct in6_addr *xhostid = NULL; int prefixlen; if ((iflr->flags & IFLR_PREFIX) != 0) { struct sockaddr_in6 *sin6; /* * xhostid is to fill in the hostid part of the * address. xhostid points to the first link-local * address attached to the interface. */ ia = in6ifa_ifpforlinklocal(ifp, 0); if (ia == NULL) return EADDRNOTAVAIL; xhostid = IFA_IN6(&ia->ia_ifa); /* prefixlen must be <= 64. */ if (64 < iflr->prefixlen) return EINVAL; prefixlen = iflr->prefixlen; /* hostid part must be zero. */ sin6 = (struct sockaddr_in6 *)&iflr->addr; if (sin6->sin6_addr.s6_addr32[2] != 0 || sin6->sin6_addr.s6_addr32[3] != 0) { return EINVAL; } } else prefixlen = iflr->prefixlen; /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ memset(&ifra, 0, sizeof(ifra)); memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name)); memcpy(&ifra.ifra_addr, &iflr->addr, ((struct sockaddr *)&iflr->addr)->sa_len); if (xhostid) { /* fill in hostid part */ ifra.ifra_addr.sin6_addr.s6_addr32[2] = xhostid->s6_addr32[2]; ifra.ifra_addr.sin6_addr.s6_addr32[3] = xhostid->s6_addr32[3]; } if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr, ((struct sockaddr *)&iflr->dstaddr)->sa_len); if (xhostid) { ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = xhostid->s6_addr32[2]; ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = xhostid->s6_addr32[3]; } } ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; return in6_control(so, SIOCAIFADDR_IN6, &ifra, ifp, l); } case SIOCGLIFADDR: case SIOCDLIFADDR: { struct in6_addr mask, candidate, match; struct sockaddr_in6 *sin6; int cmp; memset(&mask, 0, sizeof(mask)); if (iflr->flags & IFLR_PREFIX) { /* lookup a prefix rather than address. */ in6_prefixlen2mask(&mask, iflr->prefixlen); sin6 = (struct sockaddr_in6 *)&iflr->addr; memcpy(&match, &sin6->sin6_addr, sizeof(match)); match.s6_addr32[0] &= mask.s6_addr32[0]; match.s6_addr32[1] &= mask.s6_addr32[1]; match.s6_addr32[2] &= mask.s6_addr32[2]; match.s6_addr32[3] &= mask.s6_addr32[3]; /* if you set extra bits, that's wrong */ if (memcmp(&match, &sin6->sin6_addr, sizeof(match))) return EINVAL; cmp = 1; } else { if (cmd == SIOCGLIFADDR) { /* on getting an address, take the 1st match */ cmp = 0; /* XXX */ } else { /* on deleting an address, do exact match */ in6_prefixlen2mask(&mask, 128); sin6 = (struct sockaddr_in6 *)&iflr->addr; memcpy(&match, &sin6->sin6_addr, sizeof(match)); cmp = 1; } } IFADDR_FOREACH(ifa, ifp) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (!cmp) break; /* * XXX: this is adhoc, but is necessary to allow * a user to specify fe80::/64 (not /10) for a * link-local address. */ memcpy(&candidate, IFA_IN6(ifa), sizeof(candidate)); in6_clearscope(&candidate); candidate.s6_addr32[0] &= mask.s6_addr32[0]; candidate.s6_addr32[1] &= mask.s6_addr32[1]; candidate.s6_addr32[2] &= mask.s6_addr32[2]; candidate.s6_addr32[3] &= mask.s6_addr32[3]; if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) break; } if (!ifa) return EADDRNOTAVAIL; ia = ifa2ia6(ifa); if (cmd == SIOCGLIFADDR) { int error; /* fill in the if_laddrreq structure */ memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len); error = sa6_recoverscope( (struct sockaddr_in6 *)&iflr->addr); if (error != 0) return error; if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { memcpy(&iflr->dstaddr, &ia->ia_dstaddr, ia->ia_dstaddr.sin6_len); error = sa6_recoverscope( (struct sockaddr_in6 *)&iflr->dstaddr); if (error != 0) return error; } else memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); iflr->prefixlen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); iflr->flags = ia->ia6_flags; /* XXX */ return 0; } else { struct in6_aliasreq ifra; /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ memset(&ifra, 0, sizeof(ifra)); memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name)); memcpy(&ifra.ifra_addr, &ia->ia_addr, ia->ia_addr.sin6_len); if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr, ia->ia_dstaddr.sin6_len); } else { memset(&ifra.ifra_dstaddr, 0, sizeof(ifra.ifra_dstaddr)); } memcpy(&ifra.ifra_dstaddr, &ia->ia_prefixmask, ia->ia_prefixmask.sin6_len); ifra.ifra_flags = ia->ia6_flags; return in6_control(so, SIOCDIFADDR_IN6, &ifra, ifp, l); } } } return EOPNOTSUPP; /* just for safety */ } /* * Initialize an interface's internet6 address * and routing table entry. */ static int in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, const struct sockaddr_in6 *sin6, int newhost) { int error = 0, plen, ifacount = 0; int s = splnet(); struct ifaddr *ifa; /* * Give the interface a chance to initialize * if this is its first address, * and to validate the address if necessary. */ IFADDR_FOREACH(ifa, ifp) { if (ifa->ifa_addr == NULL) continue; /* just for safety */ if (ifa->ifa_addr->sa_family != AF_INET6) continue; ifacount++; } ia->ia_addr = *sin6; if (ifacount <= 1 && (error = (*ifp->if_ioctl)(ifp, SIOCINITIFADDR, ia)) != 0) { splx(s); return error; } splx(s); ia->ia_ifa.ifa_metric = ifp->if_metric; /* we could do in(6)_socktrim here, but just omit it at this moment. */ /* * Special case: * If the destination address is specified for a point-to-point * interface, install a route to the destination as an interface * direct route. */ plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { if ((error = rtinit(&ia->ia_ifa, RTM_ADD, RTF_UP | RTF_HOST)) != 0) return error; ia->ia_flags |= IFA_ROUTE; } /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ if (newhost) { /* set the rtrequest function to create llinfo */ ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; in6_ifaddloop(&ia->ia_ifa); } if (ifp->if_flags & IFF_MULTICAST) in6_restoremkludge(ia, ifp); return error; } static struct ifaddr * bestifa(struct ifaddr *best_ifa, struct ifaddr *ifa) { if (best_ifa == NULL || best_ifa->ifa_preference < ifa->ifa_preference) return ifa; return best_ifa; } /* * Find an IPv6 interface link-local address specific to an interface. */ struct in6_ifaddr * in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags) { struct ifaddr *best_ifa = NULL, *ifa; IFADDR_FOREACH(ifa, ifp) { if (ifa->ifa_addr == NULL) continue; /* just for safety */ if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) continue; if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0) continue; best_ifa = bestifa(best_ifa, ifa); } return (struct in6_ifaddr *)best_ifa; } /* * find the internet address corresponding to a given interface and address. */ struct in6_ifaddr * in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) { struct ifaddr *best_ifa = NULL, *ifa; IFADDR_FOREACH(ifa, ifp) { if (ifa->ifa_addr == NULL) continue; /* just for safety */ if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (!IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) continue; best_ifa = bestifa(best_ifa, ifa); } return (struct in6_ifaddr *)best_ifa; } static struct in6_ifaddr * bestia(struct in6_ifaddr *best_ia, struct in6_ifaddr *ia) { if (best_ia == NULL || best_ia->ia_ifa.ifa_preference < ia->ia_ifa.ifa_preference) return ia; return best_ia; } /* * find the internet address on a given interface corresponding to a neighbor's * address. */ struct in6_ifaddr * in6ifa_ifplocaladdr(const struct ifnet *ifp, const struct in6_addr *addr) { struct ifaddr *ifa; struct in6_ifaddr *best_ia = NULL, *ia; IFADDR_FOREACH(ifa, ifp) { if (ifa->ifa_addr == NULL) continue; /* just for safety */ if (ifa->ifa_addr->sa_family != AF_INET6) continue; ia = (struct in6_ifaddr *)ifa; if (!IN6_ARE_MASKED_ADDR_EQUAL(addr, &ia->ia_addr.sin6_addr, &ia->ia_prefixmask.sin6_addr)) continue; best_ia = bestia(best_ia, ia); } return best_ia; } /* * Convert IP6 address to printable (loggable) representation. */ static int ip6round = 0; char * ip6_sprintf(const struct in6_addr *addr) { static char ip6buf[8][48]; int i; char *bp; char *cp; const u_int16_t *a = (const u_int16_t *)addr; const u_int8_t *d; int dcolon = 0; ip6round = (ip6round + 1) & 7; cp = ip6buf[ip6round]; for (i = 0; i < 8; i++) { if (dcolon == 1) { if (*a == 0) { if (i == 7) *cp++ = ':'; a++; continue; } else dcolon = 2; } if (*a == 0) { if (dcolon == 0 && *(a + 1) == 0) { if (i == 0) *cp++ = ':'; *cp++ = ':'; dcolon = 1; } else { *cp++ = '0'; *cp++ = ':'; } a++; continue; } d = (const u_char *)a; bp = cp; *cp = hexdigits[*d >> 4]; if (*cp != '0') cp++; *cp = hexdigits[*d++ & 0xf]; if (cp != bp || *cp != '0') cp++; *cp = hexdigits[*d >> 4]; if (cp != bp || *cp != '0') cp++; *cp++ = hexdigits[*d & 0xf]; *cp++ = ':'; a++; } *--cp = 0; return ip6buf[ip6round]; } /* * Determine if an address is on a local network. */ int in6_localaddr(const struct in6_addr *in6) { struct in6_ifaddr *ia; if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) return 1; for (ia = in6_ifaddr; ia; ia = ia->ia_next) if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, &ia->ia_prefixmask.sin6_addr)) return 1; return 0; } int in6_is_addr_deprecated(struct sockaddr_in6 *sa6) { struct in6_ifaddr *ia; for (ia = in6_ifaddr; ia; ia = ia->ia_next) { if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &sa6->sin6_addr) && #ifdef SCOPEDROUTING ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && #endif (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) return 1; /* true */ /* XXX: do we still have to go thru the rest of the list? */ } return 0; /* false */ } /* * return length of part which dst and src are equal * hard coding... */ int in6_matchlen(struct in6_addr *src, struct in6_addr *dst) { int match = 0; u_char *s = (u_char *)src, *d = (u_char *)dst; u_char *lim = s + 16, r; while (s < lim) if ((r = (*d++ ^ *s++)) != 0) { while (r < 128) { match++; r <<= 1; } break; } else match += NBBY; return match; } /* XXX: to be scope conscious */ int in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) { int bytelen, bitlen; /* sanity check */ if (len < 0 || len > 128) { log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", len); return 0; } bytelen = len / NBBY; bitlen = len % NBBY; if (memcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) return 0; if (bitlen != 0 && p1->s6_addr[bytelen] >> (NBBY - bitlen) != p2->s6_addr[bytelen] >> (NBBY - bitlen)) return 0; return 1; } void in6_prefixlen2mask(struct in6_addr *maskp, int len) { static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; int bytelen, bitlen, i; /* sanity check */ if (len < 0 || len > 128) { log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", len); return; } memset(maskp, 0, sizeof(*maskp)); bytelen = len / NBBY; bitlen = len % NBBY; for (i = 0; i < bytelen; i++) maskp->s6_addr[i] = 0xff; if (bitlen) maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; } /* * return the best address out of the same scope. if no address was * found, return the first valid address from designated IF. */ struct in6_ifaddr * in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) { int dst_scope = in6_addrscope(dst), blen = -1, tlen; struct ifaddr *ifa; struct in6_ifaddr *best_ia = NULL, *ia; struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ dep[0] = dep[1] = NULL; /* * We first look for addresses in the same scope. * If there is one, return it. * If two or more, return one which matches the dst longest. * If none, return one of global addresses assigned other ifs. */ IFADDR_FOREACH(ifa, ifp) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; ia = (struct in6_ifaddr *)ifa; if (ia->ia6_flags & IN6_IFF_ANYCAST) continue; /* XXX: is there any case to allow anycast? */ if (ia->ia6_flags & IN6_IFF_NOTREADY) continue; /* don't use this interface */ if (ia->ia6_flags & IN6_IFF_DETACHED) continue; if (ia->ia6_flags & IN6_IFF_DEPRECATED) { if (ip6_use_deprecated) dep[0] = ia; continue; } if (dst_scope != in6_addrscope(IFA_IN6(ifa))) continue; /* * call in6_matchlen() as few as possible */ if (best_ia == NULL) { best_ia = ia; continue; } if (blen == -1) blen = in6_matchlen(&best_ia->ia_addr.sin6_addr, dst); tlen = in6_matchlen(IFA_IN6(ifa), dst); if (tlen > blen) { blen = tlen; best_ia = ia; } else if (tlen == blen) best_ia = bestia(best_ia, ia); } if (best_ia != NULL) return best_ia; IFADDR_FOREACH(ifa, ifp) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; ia = (struct in6_ifaddr *)ifa; if (ia->ia6_flags & IN6_IFF_ANYCAST) continue; /* XXX: is there any case to allow anycast? */ if (ia->ia6_flags & IN6_IFF_NOTREADY) continue; /* don't use this interface */ if (ia->ia6_flags & IN6_IFF_DETACHED) continue; if (ia->ia6_flags & IN6_IFF_DEPRECATED) { if (ip6_use_deprecated) dep[1] = (struct in6_ifaddr *)ifa; continue; } best_ia = bestia(best_ia, ia); } if (best_ia != NULL) return best_ia; /* use the last-resort values, that are, deprecated addresses */ if (dep[0]) return dep[0]; if (dep[1]) return dep[1]; return NULL; } /* * perform DAD when interface becomes IFF_UP. */ void in6_if_up(struct ifnet *ifp) { struct ifaddr *ifa; struct in6_ifaddr *ia; IFADDR_FOREACH(ifa, ifp) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; ia = (struct in6_ifaddr *)ifa; if (ia->ia6_flags & IN6_IFF_TENTATIVE) { /* * The TENTATIVE flag was likely set by hand * beforehand, implicitly indicating the need for DAD. * We may be able to skip the random delay in this * case, but we impose delays just in case. */ nd6_dad_start(ifa, arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); } } /* * special cases, like 6to4, are handled in in6_ifattach */ in6_ifattach(ifp, NULL); } int in6if_do_dad(struct ifnet *ifp) { if ((ifp->if_flags & IFF_LOOPBACK) != 0) return 0; switch (ifp->if_type) { case IFT_FAITH: /* * These interfaces do not have the IFF_LOOPBACK flag, * but loop packets back. We do not have to do DAD on such * interfaces. We should even omit it, because loop-backed * NS would confuse the DAD procedure. */ return 0; default: /* * Our DAD routine requires the interface up and running. * However, some interfaces can be up before the RUNNING * status. Additionaly, users may try to assign addresses * before the interface becomes up (or running). * We simply skip DAD in such a case as a work around. * XXX: we should rather mark "tentative" on such addresses, * and do DAD after the interface becomes ready. */ if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) return 0; return 1; } } /* * Calculate max IPv6 MTU through all the interfaces and store it * to in6_maxmtu. */ void in6_setmaxmtu(void) { unsigned long maxmtu = 0; struct ifnet *ifp; TAILQ_FOREACH(ifp, &ifnet, if_list) { /* this function can be called during ifnet initialization */ if (!ifp->if_afdata[AF_INET6]) continue; if ((ifp->if_flags & IFF_LOOPBACK) == 0 && IN6_LINKMTU(ifp) > maxmtu) maxmtu = IN6_LINKMTU(ifp); } if (maxmtu) /* update only when maxmtu is positive */ in6_maxmtu = maxmtu; } /* * Provide the length of interface identifiers to be used for the link attached * to the given interface. The length should be defined in "IPv6 over * xxx-link" document. Note that address architecture might also define * the length for a particular set of address prefixes, regardless of the * link type. As clarified in rfc2462bis, those two definitions should be * consistent, and those really are as of August 2004. */ int in6_if2idlen(struct ifnet *ifp) { switch (ifp->if_type) { case IFT_ETHER: /* RFC2464 */ case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ case IFT_L2VLAN: /* ditto */ case IFT_IEEE80211: /* ditto */ case IFT_FDDI: /* RFC2467 */ case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ case IFT_PPP: /* RFC2472 */ case IFT_ARCNET: /* RFC2497 */ case IFT_FRELAY: /* RFC2590 */ case IFT_IEEE1394: /* RFC3146 */ case IFT_GIF: /* draft-ietf-v6ops-mech-v2-07 */ case IFT_LOOP: /* XXX: is this really correct? */ return 64; default: /* * Unknown link type: * It might be controversial to use the today's common constant * of 64 for these cases unconditionally. For full compliance, * we should return an error in this case. On the other hand, * if we simply miss the standard for the link type or a new * standard is defined for a new link type, the IFID length * is very likely to be the common constant. As a compromise, * we always use the constant, but make an explicit notice * indicating the "unknown" case. */ printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); return 64; } } void * in6_domifattach(struct ifnet *ifp) { struct in6_ifextra *ext; ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO); ext->in6_ifstat = malloc(sizeof(struct in6_ifstat), M_IFADDR, M_WAITOK|M_ZERO); ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat), M_IFADDR, M_WAITOK|M_ZERO); ext->nd_ifinfo = nd6_ifattach(ifp); ext->scope6_id = scope6_ifattach(ifp); return ext; } void in6_domifdetach(struct ifnet *ifp, void *aux) { struct in6_ifextra *ext = (struct in6_ifextra *)aux; nd6_ifdetach(ext->nd_ifinfo); free(ext->in6_ifstat, M_IFADDR); free(ext->icmp6_ifstat, M_IFADDR); scope6_ifdetach(ext->scope6_id); free(ext, M_IFADDR); } /* * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be * v4 mapped addr or v4 compat addr */ void in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) { memset(sin, 0, sizeof(*sin)); sin->sin_len = sizeof(struct sockaddr_in); sin->sin_family = AF_INET; sin->sin_port = sin6->sin6_port; sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; } /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ void in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) { memset(sin6, 0, sizeof(*sin6)); sin6->sin6_len = sizeof(struct sockaddr_in6); sin6->sin6_family = AF_INET6; sin6->sin6_port = sin->sin_port; sin6->sin6_addr.s6_addr32[0] = 0; sin6->sin6_addr.s6_addr32[1] = 0; sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; } /* Convert sockaddr_in6 into sockaddr_in. */ void in6_sin6_2_sin_in_sock(struct sockaddr *nam) { struct sockaddr_in *sin_p; struct sockaddr_in6 sin6; /* * Save original sockaddr_in6 addr and convert it * to sockaddr_in. */ sin6 = *(struct sockaddr_in6 *)nam; sin_p = (struct sockaddr_in *)nam; in6_sin6_2_sin(sin_p, &sin6); } /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ void in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) { struct sockaddr_in *sin_p; struct sockaddr_in6 *sin6_p; sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); sin_p = (struct sockaddr_in *)*nam; in6_sin_2_v4mapsin6(sin_p, sin6_p); free(*nam, M_SONAME); *nam = (struct sockaddr *)sin6_p; }