/* $NetBSD: in6.c,v 1.9 2000/01/06 15:46:09 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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 "opt_inet.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "gif.h" #if NGIF > 0 #include #endif #include #include #include #include #include #include #include #include #include #include #include /* * Definitions of some costant 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; static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t, struct ifnet *, struct proc *)); /* * This structure is used to keep track of in6_multi chains which belong to * deleted interface addresses. */ static LIST_HEAD(, multi6_kludge) in6_mk; /* XXX BSS initialization */ struct multi6_kludge { LIST_ENTRY(multi6_kludge) mk_entry; struct ifnet *mk_ifp; struct in6_multihead mk_head; }; /* * Determine whether an IP6 address is in a reserved set of addresses * that may not be forwarded, or whether datagrams to that destination * may be forwarded. */ int in6_canforward(src, dst) struct in6_addr *src, *dst; { if (IN6_IS_ADDR_LINKLOCAL(src) || IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) return(0); return(1); } /* * Check if the loopback entry will be automatically generated. * if 0 returned, will not be automatically generated. * if 1 returned, will be automatically generated. */ static int in6_is_ifloop_auto(struct ifaddr *ifa) { #define SIN6(s) ((struct sockaddr_in6 *)s) /* * If RTF_CLONING is unset, or (IFF_LOOPBACK | IFF_POINTOPOINT), * or netmask is all0 or all1, then cloning will not happen, * then we can't rely on its loopback entry generation. */ if ((ifa->ifa_flags & RTF_CLONING) == 0 || (ifa->ifa_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) || (SIN6(ifa->ifa_netmask)->sin6_len == sizeof(struct sockaddr_in6) && IN6_ARE_ADDR_EQUAL(&SIN6(ifa->ifa_netmask)->sin6_addr, &in6mask128)) || ((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_len == 0) return 0; else return 1; #undef SIN6 } /* * 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; bzero(&lo_sa, sizeof(lo_sa)); bzero(&all1_sa, sizeof(all1_sa)); lo_sa.sin6_family = AF_INET6; lo_sa.sin6_len = sizeof(struct sockaddr_in6); all1_sa = lo_sa; lo_sa.sin6_addr = in6addr_loopback; all1_sa.sin6_addr = in6mask128; /* So we add or remove static loopback entry, here. */ rtrequest(cmd, ifa->ifa_addr, (struct sockaddr *)&lo_sa, (struct sockaddr *)&all1_sa, RTF_UP|RTF_HOST, &nrt); /* * Make sure rt_ifa be equal to IFA, the second argument of the * function. * We need this because when we refer 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) { nrt->rt_ifa->ifa_refcnt--; ifa->ifa_refcnt++; nrt->rt_ifa = ifa; } if (nrt) nrt->rt_refcnt--; } /* * Add ownaddr as loopback rtentry, if necessary(ex. on p2p link). * Because, KAME needs loopback rtentry for ownaddr check in * ip6_input(). */ static void in6_ifaddloop(struct ifaddr *ifa) { if (!in6_is_ifloop_auto(ifa)) { struct rtentry *rt; /* If there is no loopback entry, allocate one. */ rt = rtalloc1(ifa->ifa_addr, 0); if (rt == 0 || (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) in6_ifloop_request(RTM_ADD, ifa); if (rt) rt->rt_refcnt--; } } /* * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), * if it exists. */ static void in6_ifremloop(struct ifaddr *ifa) { if (!in6_is_ifloop_auto(ifa)) { struct in6_ifaddr *ia; int ia_count = 0; /* If only one ifa for the loopback entry, delete it. */ for (ia = in6_ifaddr; ia; ia = ia->ia_next) { if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) { ia_count++; if (ia_count > 1) break; } } if (ia_count == 1) in6_ifloop_request(RTM_DELETE, ifa); } } /* * Subroutine for in6_ifaddproxy() and in6_ifremproxy(). * This routine does actual work. * call in6_addmulti() when cmd == 1. * call in6_delmulti() when cmd == 2. */ static int in6_ifproxy_request(int cmd, struct in6_ifaddr *ia) { int error = 0; /* * If we have an IPv6 dstaddr on adding p2p interface, * join dstaddr's solicited multicast on necessary interface. */ if ((ia->ia_ifp->if_flags & IFF_POINTOPOINT) && ia->ia_dstaddr.sin6_family == AF_INET6 && !IN6_IS_ADDR_LINKLOCAL(&ia->ia_dstaddr.sin6_addr)) { struct in6_ifaddr *ia_lan; /* * TODO: Join only on some specified interfaces by some * configuration. * Unsolicited Neighbor Advertisements will be also necessary. * * Now, join on interfaces which meets following. * -IFF_BROADCAST and IFF_MULTICAST * (NBMA is out of scope) * -the prefix value is same as p2p dstaddr */ for (ia_lan = in6_ifaddr; ia_lan; ia_lan = ia_lan->ia_next) { struct in6_addr llsol; if ((ia_lan->ia_ifp->if_flags & (IFF_BROADCAST|IFF_MULTICAST)) != (IFF_BROADCAST|IFF_MULTICAST)) continue; if (!IN6_ARE_MASKED_ADDR_EQUAL(IA6_IN6(ia), IA6_IN6(ia_lan), IA6_MASKIN6(ia_lan))) continue; if (ia_lan->ia_ifp == ia->ia_ifp) continue; /* init llsol */ bzero(&llsol, sizeof(struct in6_addr)); llsol.s6_addr16[0] = htons(0xff02); llsol.s6_addr16[1] = htons(ia_lan->ia_ifp->if_index); llsol.s6_addr32[1] = 0; llsol.s6_addr32[2] = htonl(1); llsol.s6_addr32[3] = ia->ia_dstaddr.sin6_addr.s6_addr32[3]; llsol.s6_addr8[12] = 0xff; if (cmd == 1) (void)in6_addmulti(&llsol, ia_lan->ia_ifp, &error); else if (cmd == 2) { struct in6_multi *in6m; IN6_LOOKUP_MULTI(llsol, ia_lan->ia_ifp, in6m); if (in6m) in6_delmulti(in6m); } } } return error; } static int in6_ifaddproxy(struct in6_ifaddr *ia) { return(in6_ifproxy_request(1, ia)); } static void in6_ifremproxy(struct in6_ifaddr *ia) { in6_ifproxy_request(2, ia); } int in6_ifindex2scopeid(idx) int idx; { struct ifnet *ifp; struct ifaddr *ifa; struct sockaddr_in6 *sin6; if (idx < 0 || if_index < idx) return -1; ifp = ifindex2ifnet[idx]; for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) return sin6->sin6_scope_id & 0xffff; } return -1; } int in6_mask2len(mask) struct in6_addr *mask; { int x, y; for (x = 0; x < sizeof(*mask); x++) { if (mask->s6_addr8[x] != 0xff) break; } y = 0; if (x < sizeof(*mask)) { for (y = 0; y < 8; y++) { if ((mask->s6_addr8[x] & (0x80 >> y)) == 0) break; } } return x * 8 + y; } void in6_len2mask(mask, len) struct in6_addr *mask; int len; { int i; bzero(mask, sizeof(*mask)); for (i = 0; i < len / 8; i++) mask->s6_addr8[i] = 0xff; if (len % 8) mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff; } int in6_interfaces; /* number of external internet interfaces */ #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) #define ia62ifa(ia6) ((struct ifaddr *)(ia6)) int in6_control(so, cmd, data, ifp, p) struct socket *so; u_long cmd; caddr_t data; struct ifnet *ifp; struct proc *p; { struct in6_ifreq *ifr = (struct in6_ifreq *)data; struct in6_ifaddr *ia, *oia; struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; struct sockaddr_in6 oldaddr, net; int error = 0, hostIsNew, prefixIsNew; time_t time_second = (time_t)time.tv_sec; int privileged; privileged = 0; if (p && !suser(p->p_ucred, &p->p_acflag)) privileged++; /* * xxx should prevent processes for link-local addresses? */ #if NGIF > 0 if (ifp && ifp->if_type == IFT_GIF) { switch (cmd) { case SIOCSIFPHYADDR_IN6: if (!privileged) return(EPERM); /*fall through*/ case SIOCGIFPSRCADDR_IN6: case SIOCGIFPDSTADDR_IN6: return gif_ioctl(ifp, cmd, data); } } #endif switch (cmd) { case SIOCGETSGCNT_IN6: case SIOCGETMIFCNT_IN6: return (mrt6_ioctl(cmd, data)); } if (ifp == 0) return(EOPNOTSUPP); switch (cmd) { case SIOCSNDFLUSH_IN6: case SIOCSPFXFLUSH_IN6: case SIOCSRTRFLUSH_IN6: case SIOCSDEFIFACE_IN6: if (!privileged) return(EPERM); /*fall through*/ 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: if (!privileged) return(EPERM); /*fall through*/ case SIOCGIFPREFIX_IN6: return(in6_prefix_ioctl(so, cmd, data, ifp)); } switch (cmd) { case SIOCALIFADDR: case SIOCDLIFADDR: if (!privileged) return(EPERM); /*fall through*/ case SIOCGLIFADDR: return in6_lifaddr_ioctl(so, cmd, data, ifp, p); } /* * Find address for this interface, if it exists. */ { struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)&ifra->ifra_addr; if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { if (sa6->sin6_addr.s6_addr16[1] == 0) { /* interface ID is not embedded by the user */ sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); } else if (sa6->sin6_addr.s6_addr16[1] != htons(ifp->if_index)) return(EINVAL); /* ifid is contradict */ if (sa6->sin6_scope_id) { if (sa6->sin6_scope_id != (u_int32_t)ifp->if_index) return(EINVAL); sa6->sin6_scope_id = 0; /* XXX: good way? */ } } } #if 0 if (ifra->ifra_addr.sin6_family == AF_INET6) { ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); } #else ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); #endif switch (cmd) { case SIOCDIFADDR_IN6: if (ia == 0) return(EADDRNOTAVAIL); /* FALLTHROUGH */ case SIOCAIFADDR_IN6: case SIOCSIFADDR_IN6: case SIOCSIFNETMASK_IN6: case SIOCSIFDSTADDR_IN6: if (!privileged) return(EPERM); if (ia == 0) { ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, M_WAITOK); if (ia == NULL) return (ENOBUFS); 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; if ((oia = in6_ifaddr) != NULL) { for ( ; oia->ia_next; oia = oia->ia_next) continue; oia->ia_next = ia; } else in6_ifaddr = ia; TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); if ((ifp->if_flags & IFF_LOOPBACK) == 0) in6_interfaces++; /*XXX*/ } if (cmd == SIOCAIFADDR_IN6) { /* sanity for overflow - beware unsigned */ struct in6_addrlifetime *lt; lt = &ifra->ifra_lifetime; if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && lt->ia6t_vltime + time_second < time_second) { return EINVAL; } if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && lt->ia6t_pltime + time_second < time_second) { return EINVAL; } } break; case SIOCGIFADDR_IN6: /* This interface is basically deprecated. use SIOCGIFCONF. */ /* fall through */ case SIOCGIFAFLAG_IN6: case SIOCGIFNETMASK_IN6: case SIOCGIFDSTADDR_IN6: case SIOCGIFALIFETIME_IN6: /* must think again about its semantics */ if (ia == 0) return(EADDRNOTAVAIL); break; case SIOCSIFALIFETIME_IN6: { struct in6_addrlifetime *lt; if (!privileged) return(EPERM); if (ia == 0) return(EADDRNOTAVAIL); /* sanity for overflow - beware unsigned */ lt = &ifr->ifr_ifru.ifru_lifetime; if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && lt->ia6t_vltime + time_second < time_second) { return EINVAL; } if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && lt->ia6t_pltime + time_second < time_second) { return EINVAL; } break; } } switch (cmd) { case SIOCGIFADDR_IN6: ifr->ifr_addr = ia->ia_addr; break; case SIOCGIFDSTADDR_IN6: if ((ifp->if_flags & IFF_POINTOPOINT) == 0) return(EINVAL); ifr->ifr_dstaddr = ia->ia_dstaddr; 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; if (in6_ifstat == NULL || ifp->if_index >= in6_ifstatmax || in6_ifstat[ifp->if_index] == NULL) { /* return EAFNOSUPPORT? */ bzero(&ifr->ifr_ifru.ifru_stat, sizeof(ifr->ifr_ifru.ifru_stat)); } else ifr->ifr_ifru.ifru_stat = *in6_ifstat[ifp->if_index]; break; case SIOCGIFSTAT_ICMP6: if (ifp == NULL) return EINVAL; if (icmp6_ifstat == NULL || ifp->if_index >= icmp6_ifstatmax || icmp6_ifstat[ifp->if_index] == NULL) { /* return EAFNOSUPPORT? */ bzero(&ifr->ifr_ifru.ifru_stat, sizeof(ifr->ifr_ifru.ifru_icmp6stat)); } else ifr->ifr_ifru.ifru_icmp6stat = *icmp6_ifstat[ifp->if_index]; break; case SIOCSIFDSTADDR_IN6: if ((ifp->if_flags & IFF_POINTOPOINT) == 0) return(EINVAL); oldaddr = ia->ia_dstaddr; ia->ia_dstaddr = ifr->ifr_dstaddr; /* link-local index check */ if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_dstaddr.sin6_addr)) { if (ia->ia_dstaddr.sin6_addr.s6_addr16[1] == 0) { /* interface ID is not embedded by the user */ ia->ia_dstaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); } else if (ia->ia_dstaddr.sin6_addr.s6_addr16[1] != htons(ifp->if_index)) { ia->ia_dstaddr = oldaddr; return(EINVAL); /* ifid is contradict */ } } if (ifp->if_ioctl && (error = (ifp->if_ioctl) (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { ia->ia_dstaddr = oldaddr; return(error); } if (ia->ia_flags & IFA_ROUTE) { ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); } break; case SIOCGIFALIFETIME_IN6: ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; break; case SIOCSIFALIFETIME_IN6: ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; /* for sanity */ 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; break; case SIOCSIFADDR_IN6: return(in6_ifinit(ifp, ia, &ifr->ifr_addr, 1)); case SIOCSIFNETMASK_IN6: ia->ia_prefixmask = ifr->ifr_addr; bzero(&net, sizeof(net)); net.sin6_len = sizeof(struct sockaddr_in6); net.sin6_family = AF_INET6; net.sin6_port = htons(0); net.sin6_flowinfo = htonl(0); net.sin6_addr.s6_addr32[0] = ia->ia_addr.sin6_addr.s6_addr32[0] & ia->ia_prefixmask.sin6_addr.s6_addr32[0]; net.sin6_addr.s6_addr32[1] = ia->ia_addr.sin6_addr.s6_addr32[1] & ia->ia_prefixmask.sin6_addr.s6_addr32[1]; net.sin6_addr.s6_addr32[2] = ia->ia_addr.sin6_addr.s6_addr32[2] & ia->ia_prefixmask.sin6_addr.s6_addr32[2]; net.sin6_addr.s6_addr32[3] = ia->ia_addr.sin6_addr.s6_addr32[3] & ia->ia_prefixmask.sin6_addr.s6_addr32[3]; ia->ia_net = net; break; case SIOCAIFADDR_IN6: prefixIsNew = 0; hostIsNew = 1; if (ifra->ifra_addr.sin6_len == 0) { ifra->ifra_addr = ia->ia_addr; hostIsNew = 0; } else if (IN6_ARE_ADDR_EQUAL(&ifra->ifra_addr.sin6_addr, &ia->ia_addr.sin6_addr)) hostIsNew = 0; if (ifra->ifra_prefixmask.sin6_len) { in6_ifscrub(ifp, ia); ia->ia_prefixmask = ifra->ifra_prefixmask; prefixIsNew = 1; } if ((ifp->if_flags & IFF_POINTOPOINT) && (ifra->ifra_dstaddr.sin6_family == AF_INET6)) { in6_ifscrub(ifp, ia); ia->ia_dstaddr = ifra->ifra_dstaddr; /* link-local index check: should be a separate function? */ if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_dstaddr.sin6_addr)) { if (ia->ia_dstaddr.sin6_addr.s6_addr16[1] == 0) { /* * interface ID is not embedded by * the user */ ia->ia_dstaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); } else if (ia->ia_dstaddr.sin6_addr.s6_addr16[1] != htons(ifp->if_index)) { ia->ia_dstaddr = oldaddr; return(EINVAL); /* ifid is contradict */ } } prefixIsNew = 1; /* We lie; but effect's the same */ } if (ifra->ifra_addr.sin6_family == AF_INET6 && (hostIsNew || prefixIsNew)) error = in6_ifinit(ifp, ia, &ifra->ifra_addr, 0); if (ifra->ifra_addr.sin6_family == AF_INET6 && hostIsNew && (ifp->if_flags & IFF_MULTICAST)) { int error_local = 0; /* * join solicited multicast addr for new host id */ 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] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; llsol.s6_addr8[12] = 0xff; (void)in6_addmulti(&llsol, ifp, &error_local); if (error == 0) error = error_local; } /* Join dstaddr's solicited multicast if necessary. */ if (nd6_proxyall && hostIsNew) { int error_local; error_local = in6_ifaddproxy(ia); if (error == 0) error = error_local; } ia->ia6_flags = ifra->ifra_flags; ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/ ia->ia6_lifetime = ifra->ifra_lifetime; /* for sanity */ 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; /* * Perform DAD, if needed. * XXX It may be of use, if we can administratively * disable DAD. */ switch (ifp->if_type) { case IFT_ARCNET: case IFT_ETHER: case IFT_FDDI: #if 0 case IFT_ATM: case IFT_SLIP: case IFT_PPP: #endif ia->ia6_flags |= IN6_IFF_TENTATIVE; nd6_dad_start((struct ifaddr *)ia, NULL); break; case IFT_FAITH: case IFT_GIF: case IFT_LOOP: default: break; } if (hostIsNew) { int iilen; int error_local = 0; iilen = (sizeof(ia->ia_prefixmask.sin6_addr) << 3) - in6_mask2len(&ia->ia_prefixmask.sin6_addr); error_local = in6_prefix_add_ifid(iilen, ia); if (error == 0) error = error_local; } return(error); case SIOCDIFADDR_IN6: in6_ifscrub(ifp, ia); 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); } /* Leave dstaddr's solicited multicast if necessary. */ if (nd6_proxyall) in6_ifremproxy(ia); TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 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 printf("Didn't unlink in6_ifaddr from list\n"); } { int iilen; iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - in6_mask2len(&oia->ia_prefixmask.sin6_addr); in6_prefix_remove_ifid(iilen, oia); } if (oia->ia6_multiaddrs.lh_first == NULL) { IFAFREE(&oia->ia_ifa); break; } else in6_savemkludge(oia); IFAFREE((&oia->ia_ifa)); break; default: if (ifp == 0 || ifp->if_ioctl == 0) return(EOPNOTSUPP); return((*ifp->if_ioctl)(ifp, cmd, data)); } return(0); } /* * 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 accomodate 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(so, cmd, data, ifp, p) struct socket *so; u_long cmd; caddr_t data; struct ifnet *ifp; struct proc *p; { 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"); /*NOTRECHED*/ } 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) * 8 < iflr->prefixlen) return EINVAL; switch (cmd) { case SIOCALIFADDR: { struct in6_aliasreq ifra; struct in6_addr *hostid = NULL; int prefixlen; if ((iflr->flags & IFLR_PREFIX) != 0) { struct sockaddr_in6 *sin6; /* * hostid is to fill in the hostid part of the * address. hostid points to the first link-local * address attached to the interface. */ ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp); if (!ifa) return EADDRNOTAVAIL; hostid = IFA_IN6(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). */ bzero(&ifra, sizeof(ifra)); bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); bcopy(&iflr->addr, &ifra.ifra_addr, ((struct sockaddr *)&iflr->addr)->sa_len); if (hostid) { /* fill in hostid part */ ifra.ifra_addr.sin6_addr.s6_addr32[2] = hostid->s6_addr32[2]; ifra.ifra_addr.sin6_addr.s6_addr32[3] = hostid->s6_addr32[3]; } if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, ((struct sockaddr *)&iflr->dstaddr)->sa_len); if (hostid) { ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = hostid->s6_addr32[2]; ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = hostid->s6_addr32[3]; } } ifra.ifra_prefixmask.sin6_family = AF_INET6; ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, p); } case SIOCGLIFADDR: case SIOCDLIFADDR: { struct in6_ifaddr *ia; struct in6_addr mask, candidate, match; struct sockaddr_in6 *sin6; int cmp; bzero(&mask, sizeof(mask)); if (iflr->flags & IFLR_PREFIX) { /* lookup a prefix rather than address. */ in6_len2mask(&mask, iflr->prefixlen); sin6 = (struct sockaddr_in6 *)&iflr->addr; bcopy(&sin6->sin6_addr, &match, 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 (bcmp(&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_len2mask(&mask, 128); sin6 = (struct sockaddr_in6 *)&iflr->addr; bcopy(&sin6->sin6_addr, &match, sizeof(match)); cmp = 1; } } for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (!cmp) break; bcopy(IFA_IN6(ifa), &candidate, sizeof(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) { /* fill in the if_laddrreq structure */ bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { bcopy(&ia->ia_dstaddr, &iflr->dstaddr, ia->ia_dstaddr.sin6_len); } else bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); iflr->prefixlen = in6_mask2len(&ia->ia_prefixmask.sin6_addr); iflr->flags = ia->ia6_flags; /*XXX*/ return 0; } else { struct in6_aliasreq ifra; /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ bzero(&ifra, sizeof(ifra)); bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); bcopy(&ia->ia_addr, &ifra.ifra_addr, ia->ia_addr.sin6_len); if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, ia->ia_dstaddr.sin6_len); } bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, ia->ia_prefixmask.sin6_len); ifra.ifra_flags = ia->ia6_flags; return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, ifp, p); } } } return EOPNOTSUPP; /*just for safety*/ } /* * Delete any existing route for an interface. */ void in6_ifscrub(ifp, ia) register struct ifnet *ifp; register struct in6_ifaddr *ia; { if ((ia->ia_flags & IFA_ROUTE) == 0) return; if (ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); else rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); ia->ia_flags &= ~IFA_ROUTE; /* Remove ownaddr's loopback rtentry, if it exists. */ in6_ifremloop(&(ia->ia_ifa)); } /* * Initialize an interface's intetnet6 address * and routing table entry. */ int in6_ifinit(ifp, ia, sin6, scrub) struct ifnet *ifp; struct in6_ifaddr *ia; struct sockaddr_in6 *sin6; int scrub; { struct sockaddr_in6 oldaddr; int error, flags = RTF_UP; int s = splimp(); oldaddr = ia->ia_addr; ia->ia_addr = *sin6; /* * Give the interface a chance to initialize * if this is its first address, * and to validate the address if necessary. */ if (ifp->if_ioctl && (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { splx(s); ia->ia_addr = oldaddr; return(error); } switch (ifp->if_type) { case IFT_ARCNET: case IFT_ETHER: case IFT_FDDI: ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; ia->ia_ifa.ifa_flags |= RTF_CLONING; break; case IFT_PPP: ia->ia_ifa.ifa_rtrequest = nd6_p2p_rtrequest; ia->ia_ifa.ifa_flags |= RTF_CLONING; break; } splx(s); if (scrub) { ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; in6_ifscrub(ifp, ia); ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; } /* xxx * in_socktrim */ /* * Add route for the network. */ ia->ia_ifa.ifa_metric = ifp->if_metric; if (ifp->if_flags & IFF_LOOPBACK) { ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; flags |= RTF_HOST; } else if (ifp->if_flags & IFF_POINTOPOINT) { if (ia->ia_dstaddr.sin6_family != AF_INET6) return(0); flags |= RTF_HOST; } if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0) ia->ia_flags |= IFA_ROUTE; /* Add ownaddr as loopback rtentry, if necessary(ex. on p2p link). */ in6_ifaddloop(&(ia->ia_ifa)); if (ifp->if_flags & IFF_MULTICAST) in6_restoremkludge(ia, ifp); return(error); } /* * Multicast address kludge: * If there were any multicast addresses attached to this interface address, * either move them to another address on this interface, or save them until * such time as this interface is reconfigured for IPv6. */ void in6_savemkludge(oia) struct in6_ifaddr *oia; { struct in6_ifaddr *ia; struct in6_multi *in6m, *next; IFP_TO_IA6(oia->ia_ifp, ia); if (ia) { /* there is another address */ for (in6m = oia->ia6_multiaddrs.lh_first; in6m; in6m = next){ next = in6m->in6m_entry.le_next; IFAFREE(&in6m->in6m_ia->ia_ifa); ia->ia_ifa.ifa_refcnt++; in6m->in6m_ia = ia; LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); } } else { /* last address on this if deleted, save */ struct multi6_kludge *mk; mk = malloc(sizeof(*mk), M_IPMADDR, M_WAITOK); LIST_INIT(&mk->mk_head); mk->mk_ifp = oia->ia_ifp; for (in6m = oia->ia6_multiaddrs.lh_first; in6m; in6m = next){ next = in6m->in6m_entry.le_next; LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry); } if (mk->mk_head.lh_first != NULL) { LIST_INSERT_HEAD(&in6_mk, mk, mk_entry); } else { FREE(mk, M_IPMADDR); } } } /* * Continuation of multicast address hack: * If there was a multicast group list previously saved for this interface, * then we re-attach it to the first address configured on the i/f. */ void in6_restoremkludge(ia, ifp) struct in6_ifaddr *ia; struct ifnet *ifp; { struct multi6_kludge *mk; for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) { if (mk->mk_ifp == ifp) { struct in6_multi *in6m, *next; for (in6m = mk->mk_head.lh_first; in6m; in6m = next){ next = in6m->in6m_entry.le_next; LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); } LIST_REMOVE(mk, mk_entry); free(mk, M_IPMADDR); break; } } } /* * Add an address to the list of IP6 multicast addresses for a * given interface. */ struct in6_multi * in6_addmulti(maddr6, ifp, errorp) register struct in6_addr *maddr6; register struct ifnet *ifp; int *errorp; { struct in6_ifaddr *ia; struct in6_ifreq ifr; struct in6_multi *in6m; int s = splsoftnet(); *errorp = 0; /* * See if address already in list. */ IN6_LOOKUP_MULTI(*maddr6, ifp, in6m); if (in6m != NULL) { /* * Found it; just increment the refrence count. */ in6m->in6m_refcount++; } else { /* * New address; allocate a new multicast record * and link it into the interface's multicast list. */ in6m = (struct in6_multi *) malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); if (in6m == NULL) { splx(s); *errorp = ENOBUFS; return(NULL); } in6m->in6m_addr = *maddr6; in6m->in6m_ifp = ifp; in6m->in6m_refcount = 1; IFP_TO_IA6(ifp, ia); if (ia == NULL) { free(in6m, M_IPMADDR); splx(s); *errorp = EADDRNOTAVAIL; /* appropriate? */ return(NULL); } in6m->in6m_ia = ia; ia->ia_ifa.ifa_refcnt++; /* gain a reference */ LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); /* * Ask the network driver to update its multicast reception * filter appropriately for the new address. */ bzero(&ifr.ifr_addr, sizeof(struct sockaddr_in6)); ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6); ifr.ifr_addr.sin6_family = AF_INET6; ifr.ifr_addr.sin6_addr = *maddr6; if (ifp->if_ioctl == NULL) *errorp = ENXIO; /* XXX: appropriate? */ else *errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr); if (*errorp) { LIST_REMOVE(in6m, in6m_entry); free(in6m, M_IPMADDR); splx(s); return(NULL); } /* * Let MLD6 know that we have joined a new IP6 multicast * group. */ mld6_start_listening(in6m); } splx(s); return(in6m); } /* * Delete a multicast address record. */ void in6_delmulti(in6m) struct in6_multi *in6m; { struct in6_ifreq ifr; int s = splsoftnet(); if (--in6m->in6m_refcount == 0) { /* * No remaining claims to this record; let MLD6 know * that we are leaving the multicast group. */ mld6_stop_listening(in6m); /* * Unlink from list. */ LIST_REMOVE(in6m, in6m_entry); IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */ /* * Notify the network driver to update its multicast * reception filter. */ bzero(&ifr.ifr_addr, sizeof(struct sockaddr_in6)); ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6); ifr.ifr_addr.sin6_family = AF_INET6; ifr.ifr_addr.sin6_addr = in6m->in6m_addr; (*in6m->in6m_ifp->if_ioctl)(in6m->in6m_ifp, SIOCDELMULTI, (caddr_t)&ifr); free(in6m, M_IPMADDR); } splx(s); } /* * Find an IPv6 interface link-local address specific to an interface. */ struct in6_ifaddr * in6ifa_ifpforlinklocal(ifp) struct ifnet *ifp; { register struct ifaddr *ifa; for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { 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))) break; } return((struct in6_ifaddr *)ifa); } /* * find the internet address corresponding to a given interface and address. */ struct in6_ifaddr * in6ifa_ifpwithaddr(ifp, addr) struct ifnet *ifp; struct in6_addr *addr; { register struct ifaddr *ifa; for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { 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))) break; } return((struct in6_ifaddr *)ifa); } /* * Convert IP6 address to printable (loggable) representation. */ static char digits[] = "0123456789abcdef"; static int ip6round = 0; char * ip6_sprintf(addr) register struct in6_addr *addr; { static char ip6buf[8][48]; register int i; register char *cp; register u_short *a = (u_short *)addr; register u_char *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 = (u_char *)a; *cp++ = digits[*d >> 4]; *cp++ = digits[*d++ & 0xf]; *cp++ = digits[*d >> 4]; *cp++ = digits[*d & 0xf]; *cp++ = ':'; a++; } *--cp = 0; return(ip6buf[ip6round]); } int in6_localaddr(in6) 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); } /* * Get a scope of the address. Node-local, link-local, site-local or global. */ int in6_addrscope (addr) struct in6_addr *addr; { int scope; if (addr->s6_addr8[0] == 0xfe) { scope = addr->s6_addr8[1] & 0xc0; switch (scope) { case 0x80: return IPV6_ADDR_SCOPE_LINKLOCAL; break; case 0xc0: return IPV6_ADDR_SCOPE_SITELOCAL; break; default: return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */ break; } } if (addr->s6_addr8[0] == 0xff) { scope = addr->s6_addr8[1] & 0x0f; /* * due to other scope such as reserved, * return scope doesn't work. */ switch (scope) { case IPV6_ADDR_SCOPE_NODELOCAL: return IPV6_ADDR_SCOPE_NODELOCAL; break; case IPV6_ADDR_SCOPE_LINKLOCAL: return IPV6_ADDR_SCOPE_LINKLOCAL; break; case IPV6_ADDR_SCOPE_SITELOCAL: return IPV6_ADDR_SCOPE_SITELOCAL; break; default: return IPV6_ADDR_SCOPE_GLOBAL; break; } } if (bcmp(&in6addr_loopback, addr, sizeof(addr) - 1) == 0) { if (addr->s6_addr8[15] == 1) /* loopback */ return IPV6_ADDR_SCOPE_NODELOCAL; if (addr->s6_addr8[15] == 0) /* unspecified */ return IPV6_ADDR_SCOPE_LINKLOCAL; } return IPV6_ADDR_SCOPE_GLOBAL; } /* * return length of part which dst and src are equal * hard coding... */ int in6_matchlen(src, dst) struct in6_addr *src, *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 += 8; return match; } int in6_are_prefix_equal(p1, p2, len) struct in6_addr *p1, *p2; int len; { int bytelen, bitlen; /* sanity check */ if (0 > len || len > 128) { log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", len); return(0); } bytelen = len / 8; bitlen = len % 8; if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) return(0); if (p1->s6_addr[bytelen] >> (8 - bitlen) != p2->s6_addr[bytelen] >> (8 - bitlen)) return(0); return(1); } void in6_prefixlen2mask(maskp, len) struct in6_addr *maskp; int len; { u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; int bytelen, bitlen, i; /* sanity check */ if (0 > len || len > 128) { log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", len); return; } bzero(maskp, sizeof(*maskp)); bytelen = len / 8; bitlen = len % 8; 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 */ struct in6_ifaddr * in6_ifawithscope(ifp, dst) register struct ifnet *ifp; register struct in6_addr *dst; { int dst_scope = in6_addrscope(dst), blen = -1, tlen; struct ifaddr *ifa; struct in6_ifaddr *besta = 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. */ for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) continue; /* XXX: is there any case to allow anycast? */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) continue; /* don't use this interface */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) continue; if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { if (ip6_use_deprecated) dep[0] = (struct in6_ifaddr *)ifa; continue; } if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { /* * call in6_matchlen() as few as possible */ if (besta) { if (blen == -1) blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); tlen = in6_matchlen(IFA_IN6(ifa), dst); if (tlen > blen) { blen = tlen; besta = (struct in6_ifaddr *)ifa; } } else besta = (struct in6_ifaddr *)ifa; } } if (besta) return besta; for (ia = in6_ifaddr; ia; ia = ia->ia_next) { if (IPV6_ADDR_SCOPE_GLOBAL != in6_addrscope(&(ia->ia_addr.sin6_addr))) continue; /* XXX: is there any case to allow anycast? */ if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0) continue; if ((ia->ia6_flags & IN6_IFF_NOTREADY) != 0) continue; if ((ia->ia6_flags & IN6_IFF_DETACHED) != 0) continue; if ((ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { if (ip6_use_deprecated) dep[1] = (struct in6_ifaddr *)ifa; continue; } return ia; } /* use the last-resort values, that are, deprecated addresses */ if (dep[0]) return dep[0]; if (dep[1]) return dep[1]; return NULL; } /* * 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(ifp, dst) register struct ifnet *ifp; register struct in6_addr *dst; { int dst_scope = in6_addrscope(dst), blen = -1, tlen; struct ifaddr *ifa; struct in6_ifaddr *besta = 0; 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. */ for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) continue; /* XXX: is there any case to allow anycast? */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) continue; /* don't use this interface */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) continue; if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { if (ip6_use_deprecated) dep[0] = (struct in6_ifaddr *)ifa; continue; } if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { /* * call in6_matchlen() as few as possible */ if (besta) { if (blen == -1) blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); tlen = in6_matchlen(IFA_IN6(ifa), dst); if (tlen > blen) { blen = tlen; besta = (struct in6_ifaddr *)ifa; } } else besta = (struct in6_ifaddr *)ifa; } } if (besta) return(besta); for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) continue; /* XXX: is there any case to allow anycast? */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) continue; /* don't use this interface */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) continue; if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { if (ip6_use_deprecated) dep[1] = (struct in6_ifaddr *)ifa; continue; } return (struct in6_ifaddr *)ifa; } /* 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(ifp) struct ifnet *ifp; { struct ifaddr *ifa; struct in6_ifaddr *ia; struct sockaddr_dl *sdl; int type; struct ether_addr ea; int off; int dad_delay; /* delay ticks before DAD output */ bzero(&ea, sizeof(ea)); sdl = NULL; for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr)) { goto dad; } if (ifa->ifa_addr->sa_family != AF_LINK) continue; sdl = (struct sockaddr_dl *)ifa->ifa_addr; break; } switch (ifp->if_type) { case IFT_LOOP: in6_ifattach(ifp, IN6_IFT_LOOP, NULL, 1); break; case IFT_SLIP: case IFT_PPP: case IFT_GIF: case IFT_FAITH: type = IN6_IFT_P2P; in6_ifattach(ifp, type, 0, 1); break; case IFT_ETHER: case IFT_FDDI: case IFT_ATM: type = IN6_IFT_802; if (sdl == NULL) break; off = sdl->sdl_nlen; if (bcmp(&sdl->sdl_data[off], &ea, sizeof(ea)) != 0) in6_ifattach(ifp, type, LLADDR(sdl), 0); break; case IFT_ARCNET: type = IN6_IFT_ARCNET; if (sdl == NULL) break; off = sdl->sdl_nlen; if (sdl->sdl_data[off] != 0) /* XXX ?: */ in6_ifattach(ifp, type, LLADDR(sdl), 0); break; default: break; } dad: dad_delay = 0; for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; ia = (struct in6_ifaddr *)ifa; if (ia->ia6_flags & IN6_IFF_TENTATIVE) nd6_dad_start(ifa, &dad_delay); } } /* * Calculate max IPv6 MTU through all the interfaces and store it * to in6_maxmtu. */ void in6_setmaxmtu() { unsigned long maxmtu = 0; struct ifnet *ifp; for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { if ((ifp->if_flags & IFF_LOOPBACK) == 0 && nd_ifinfo[ifp->if_index].linkmtu > maxmtu) maxmtu = nd_ifinfo[ifp->if_index].linkmtu; } if (maxmtu) /* update only when maxmtu is positive */ in6_maxmtu = maxmtu; }