/*- * Copyright (c) 1982, 1986, 1991, 1993 * The Regents of the University of California. All rights reserved. * Copyright (C) 2001 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. * 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 8.4 (Berkeley) 1/9/95 */ #include __FBSDID("$FreeBSD$"); #include "opt_carp.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int in_mask2len(struct in_addr *); static void in_len2mask(struct in_addr *, int); static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, struct ifnet *, struct thread *); static int in_addprefix(struct in_ifaddr *, int); static int in_scrubprefix(struct in_ifaddr *); static void in_socktrim(struct sockaddr_in *); static int in_ifinit(struct ifnet *, struct in_ifaddr *, struct sockaddr_in *, int); static void in_purgemaddrs(struct ifnet *); #ifdef VIMAGE_GLOBALS static int subnetsarelocal; static int sameprefixcarponly; extern struct inpcbinfo ripcbinfo; #endif SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, subnetsarelocal, 0, "Treat all subnets as directly connected"); SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW, sameprefixcarponly, 0, "Refuse to create same prefixes on different interfaces"); /* * Return 1 if an internet address is for a ``local'' host * (one to which we have a connection). If subnetsarelocal * is true, this includes other subnets of the local net. * Otherwise, it includes only the directly-connected (sub)nets. */ int in_localaddr(struct in_addr in) { INIT_VNET_INET(curvnet); register u_long i = ntohl(in.s_addr); register struct in_ifaddr *ia; if (V_subnetsarelocal) { TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) if ((i & ia->ia_netmask) == ia->ia_net) return (1); } else { TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) if ((i & ia->ia_subnetmask) == ia->ia_subnet) return (1); } return (0); } /* * Return 1 if an internet address is for the local host and configured * on one of its interfaces. */ int in_localip(struct in_addr in) { INIT_VNET_INET(curvnet); struct in_ifaddr *ia; LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) return (1); } return (0); } /* * Determine whether an IP address is in a reserved set of addresses * that may not be forwarded, or whether datagrams to that destination * may be forwarded. */ int in_canforward(struct in_addr in) { register u_long i = ntohl(in.s_addr); register u_long net; if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) return (0); if (IN_CLASSA(i)) { net = i & IN_CLASSA_NET; if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) return (0); } return (1); } /* * Trim a mask in a sockaddr */ static void in_socktrim(struct sockaddr_in *ap) { register char *cplim = (char *) &ap->sin_addr; register char *cp = (char *) (&ap->sin_addr + 1); ap->sin_len = 0; while (--cp >= cplim) if (*cp) { (ap)->sin_len = cp - (char *) (ap) + 1; break; } } static int in_mask2len(mask) struct in_addr *mask; { int x, y; u_char *p; p = (u_char *)mask; for (x = 0; x < sizeof(*mask); x++) { if (p[x] != 0xff) break; } y = 0; if (x < sizeof(*mask)) { for (y = 0; y < 8; y++) { if ((p[x] & (0x80 >> y)) == 0) break; } } return (x * 8 + y); } static void in_len2mask(struct in_addr *mask, int len) { int i; u_char *p; p = (u_char *)mask; bzero(mask, sizeof(*mask)); for (i = 0; i < len / 8; i++) p[i] = 0xff; if (len % 8) p[i] = (0xff00 >> (len % 8)) & 0xff; } /* * Generic internet control operations (ioctl's). * Ifp is 0 if not an interface-specific ioctl. */ /* ARGSUSED */ int in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) { INIT_VNET_INET(curvnet); /* both so and ifp can be NULL here! */ register struct ifreq *ifr = (struct ifreq *)data; register struct in_ifaddr *ia, *iap; register struct ifaddr *ifa; struct in_addr allhosts_addr; struct in_addr dst; struct in_ifaddr *oia; struct in_aliasreq *ifra = (struct in_aliasreq *)data; struct sockaddr_in oldaddr; int error, hostIsNew, iaIsNew, maskIsNew, s; int iaIsFirst; ia = NULL; iaIsFirst = 0; iaIsNew = 0; allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); switch (cmd) { case SIOCALIFADDR: if (td != NULL) { error = priv_check(td, PRIV_NET_ADDIFADDR); if (error) return (error); } if (ifp == NULL) return (EINVAL); return in_lifaddr_ioctl(so, cmd, data, ifp, td); case SIOCDLIFADDR: if (td != NULL) { error = priv_check(td, PRIV_NET_DELIFADDR); if (error) return (error); } if (ifp == NULL) return (EINVAL); return in_lifaddr_ioctl(so, cmd, data, ifp, td); case SIOCGLIFADDR: if (ifp == NULL) return (EINVAL); return in_lifaddr_ioctl(so, cmd, data, ifp, td); } /* * Find address for this interface, if it exists. * * If an alias address was specified, find that one instead of * the first one on the interface, if possible. */ if (ifp != NULL) { dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) if (iap->ia_ifp == ifp && iap->ia_addr.sin_addr.s_addr == dst.s_addr) { if (td == NULL || prison_check_ip4( td->td_ucred, &dst)) ia = iap; break; } if (ia == NULL) TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { iap = ifatoia(ifa); if (iap->ia_addr.sin_family == AF_INET) { if (td != NULL && !prison_check_ip4(td->td_ucred, &iap->ia_addr.sin_addr)) continue; ia = iap; break; } } if (ia == NULL) iaIsFirst = 1; } switch (cmd) { case SIOCAIFADDR: case SIOCDIFADDR: if (ifp == NULL) return (EADDRNOTAVAIL); if (ifra->ifra_addr.sin_family == AF_INET) { for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { if (ia->ia_ifp == ifp && ia->ia_addr.sin_addr.s_addr == ifra->ifra_addr.sin_addr.s_addr) break; } if ((ifp->if_flags & IFF_POINTOPOINT) && (cmd == SIOCAIFADDR) && (ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY)) { return (EDESTADDRREQ); } } if (cmd == SIOCDIFADDR && ia == NULL) return (EADDRNOTAVAIL); /* FALLTHROUGH */ case SIOCSIFADDR: case SIOCSIFNETMASK: case SIOCSIFDSTADDR: if (td != NULL) { error = priv_check(td, (cmd == SIOCDIFADDR) ? PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); if (error) return (error); } if (ifp == NULL) return (EADDRNOTAVAIL); if (ia == NULL) { ia = (struct in_ifaddr *) malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO); if (ia == NULL) return (ENOBUFS); /* * Protect from ipintr() traversing address list * while we're modifying it. */ s = splnet(); ifa = &ia->ia_ifa; IFA_LOCK_INIT(ifa); ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; ifa->ifa_refcnt = 1; TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); ia->ia_sockmask.sin_len = 8; ia->ia_sockmask.sin_family = AF_INET; if (ifp->if_flags & IFF_BROADCAST) { ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); ia->ia_broadaddr.sin_family = AF_INET; } ia->ia_ifp = ifp; TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); splx(s); iaIsNew = 1; } break; case SIOCSIFBRDADDR: if (td != NULL) { error = priv_check(td, PRIV_NET_ADDIFADDR); if (error) return (error); } /* FALLTHROUGH */ case SIOCGIFADDR: case SIOCGIFNETMASK: case SIOCGIFDSTADDR: case SIOCGIFBRDADDR: if (ia == NULL) return (EADDRNOTAVAIL); break; } switch (cmd) { case SIOCGIFADDR: *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; return (0); case SIOCGIFBRDADDR: if ((ifp->if_flags & IFF_BROADCAST) == 0) return (EINVAL); *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; return (0); case SIOCGIFDSTADDR: if ((ifp->if_flags & IFF_POINTOPOINT) == 0) return (EINVAL); *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; return (0); case SIOCGIFNETMASK: *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; return (0); case SIOCSIFDSTADDR: if ((ifp->if_flags & IFF_POINTOPOINT) == 0) return (EINVAL); oldaddr = ia->ia_dstaddr; ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; if (ifp->if_ioctl != NULL) { IFF_LOCKGIANT(ifp); error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, (caddr_t)ia); IFF_UNLOCKGIANT(ifp); if (error) { 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); } return (0); case SIOCSIFBRDADDR: if ((ifp->if_flags & IFF_BROADCAST) == 0) return (EINVAL); ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; return (0); case SIOCSIFADDR: error = in_ifinit(ifp, ia, (struct sockaddr_in *) &ifr->ifr_addr, 1); if (error != 0 && iaIsNew) break; if (error == 0) { if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST) != 0) in_addmulti(&allhosts_addr, ifp); EVENTHANDLER_INVOKE(ifaddr_event, ifp); } return (0); case SIOCSIFNETMASK: ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); return (0); case SIOCAIFADDR: maskIsNew = 0; hostIsNew = 1; error = 0; if (ia->ia_addr.sin_family == AF_INET) { if (ifra->ifra_addr.sin_len == 0) { ifra->ifra_addr = ia->ia_addr; hostIsNew = 0; } else if (ifra->ifra_addr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) hostIsNew = 0; } if (ifra->ifra_mask.sin_len) { in_ifscrub(ifp, ia); ia->ia_sockmask = ifra->ifra_mask; ia->ia_sockmask.sin_family = AF_INET; ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); maskIsNew = 1; } if ((ifp->if_flags & IFF_POINTOPOINT) && (ifra->ifra_dstaddr.sin_family == AF_INET)) { in_ifscrub(ifp, ia); ia->ia_dstaddr = ifra->ifra_dstaddr; maskIsNew = 1; /* We lie; but the effect's the same */ } if (ifra->ifra_addr.sin_family == AF_INET && (hostIsNew || maskIsNew)) error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); if (error != 0 && iaIsNew) break; if ((ifp->if_flags & IFF_BROADCAST) && (ifra->ifra_broadaddr.sin_family == AF_INET)) ia->ia_broadaddr = ifra->ifra_broadaddr; if (error == 0) { if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST) != 0) in_addmulti(&allhosts_addr, ifp); EVENTHANDLER_INVOKE(ifaddr_event, ifp); } return (error); case SIOCDIFADDR: /* * in_ifscrub kills the interface route. */ in_ifscrub(ifp, ia); /* * in_ifadown gets rid of all the rest of * the routes. This is not quite the right * thing to do, but at least if we are running * a routing process they will come back. */ in_ifadown(&ia->ia_ifa, 1); EVENTHANDLER_INVOKE(ifaddr_event, ifp); error = 0; break; default: if (ifp == NULL || ifp->if_ioctl == NULL) return (EOPNOTSUPP); IFF_LOCKGIANT(ifp); error = (*ifp->if_ioctl)(ifp, cmd, data); IFF_UNLOCKGIANT(ifp); return (error); } /* * Protect from ipintr() traversing address list while we're modifying * it. */ s = splnet(); TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); if (ia->ia_addr.sin_family == AF_INET) { LIST_REMOVE(ia, ia_hash); /* * If this is the last IPv4 address configured on this * interface, leave the all-hosts group. * XXX: This is quite ugly because of locking and structure. */ oia = NULL; IFP_TO_IA(ifp, oia); if (oia == NULL) { struct in_multi *inm; IFF_LOCKGIANT(ifp); IN_MULTI_LOCK(); IN_LOOKUP_MULTI(allhosts_addr, ifp, inm); if (inm != NULL) in_delmulti_locked(inm); IN_MULTI_UNLOCK(); IFF_UNLOCKGIANT(ifp); } } IFAFREE(&ia->ia_ifa); splx(s); return (error); } /* * 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: * EINVAL since we can't deduce hostid part of the address. * 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 in_ioctl() */ static int in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) { struct if_laddrreq *iflr = (struct if_laddrreq *)data; struct ifaddr *ifa; /* sanity checks */ if (data == NULL || ifp == NULL) { panic("invalid argument to in_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 */ if (iflr->addr.ss_family != AF_INET) return (EINVAL); if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) return (EINVAL); /* XXX need improvement */ if (iflr->dstaddr.ss_family && iflr->dstaddr.ss_family != AF_INET) return (EINVAL); if (iflr->dstaddr.ss_family && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) return (EINVAL); break; default: /*shouldn't happen*/ return (EOPNOTSUPP); } if (sizeof(struct in_addr) * 8 < iflr->prefixlen) return (EINVAL); switch (cmd) { case SIOCALIFADDR: { struct in_aliasreq ifra; if (iflr->flags & IFLR_PREFIX) return (EINVAL); /* copy args to in_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, iflr->addr.ss_len); if (iflr->dstaddr.ss_family) { /*XXX*/ bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, iflr->dstaddr.ss_len); } ifra.ifra_mask.sin_family = AF_INET; ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); } case SIOCGLIFADDR: case SIOCDLIFADDR: { struct in_ifaddr *ia; struct in_addr mask, candidate, match; struct sockaddr_in *sin; bzero(&mask, sizeof(mask)); bzero(&match, sizeof(match)); if (iflr->flags & IFLR_PREFIX) { /* lookup a prefix rather than address. */ in_len2mask(&mask, iflr->prefixlen); sin = (struct sockaddr_in *)&iflr->addr; match.s_addr = sin->sin_addr.s_addr; match.s_addr &= mask.s_addr; /* if you set extra bits, that's wrong */ if (match.s_addr != sin->sin_addr.s_addr) return (EINVAL); } else { /* on getting an address, take the 1st match */ /* on deleting an address, do exact match */ if (cmd != SIOCGLIFADDR) { in_len2mask(&mask, 32); sin = (struct sockaddr_in *)&iflr->addr; match.s_addr = sin->sin_addr.s_addr; } } TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { if (ifa->ifa_addr->sa_family != AF_INET6) continue; if (match.s_addr == 0) break; candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; candidate.s_addr &= mask.s_addr; if (candidate.s_addr == match.s_addr) break; } if (ifa == NULL) return (EADDRNOTAVAIL); ia = (struct in_ifaddr *)ifa; if (cmd == SIOCGLIFADDR) { /* fill in the if_laddrreq structure */ bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { bcopy(&ia->ia_dstaddr, &iflr->dstaddr, ia->ia_dstaddr.sin_len); } else bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); iflr->prefixlen = in_mask2len(&ia->ia_sockmask.sin_addr); iflr->flags = 0; /*XXX*/ return (0); } else { struct in_aliasreq ifra; /* fill in_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.sin_len); if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, ia->ia_dstaddr.sin_len); } bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, ia->ia_sockmask.sin_len); return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, ifp, td)); } } } return (EOPNOTSUPP); /*just for safety*/ } /* * Delete any existing route for an interface. */ void in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) { in_scrubprefix(ia); } /* * Initialize an interface's internet address * and routing table entry. */ static int in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, int scrub) { INIT_VNET_INET(ifp->if_vnet); register u_long i = ntohl(sin->sin_addr.s_addr); struct sockaddr_in oldaddr; int s = splimp(), flags = RTF_UP, error = 0; oldaddr = ia->ia_addr; if (oldaddr.sin_family == AF_INET) LIST_REMOVE(ia, ia_hash); ia->ia_addr = *sin; if (ia->ia_addr.sin_family == AF_INET) LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash); /* * Give the interface a chance to initialize * if this is its first address, * and to validate the address if necessary. */ if (ifp->if_ioctl != NULL) { IFF_LOCKGIANT(ifp); error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); IFF_UNLOCKGIANT(ifp); if (error) { splx(s); /* LIST_REMOVE(ia, ia_hash) is done in in_control */ ia->ia_addr = oldaddr; if (ia->ia_addr.sin_family == AF_INET) LIST_INSERT_HEAD(INADDR_HASH( ia->ia_addr.sin_addr.s_addr), ia, ia_hash); else /* * If oldaddr family is not AF_INET (e.g. * interface has been just created) in_control * does not call LIST_REMOVE, and we end up * with bogus ia entries in hash */ LIST_REMOVE(ia, ia_hash); return (error); } } splx(s); if (scrub) { ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; in_ifscrub(ifp, ia); ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; } if (IN_CLASSA(i)) ia->ia_netmask = IN_CLASSA_NET; else if (IN_CLASSB(i)) ia->ia_netmask = IN_CLASSB_NET; else ia->ia_netmask = IN_CLASSC_NET; /* * The subnet mask usually includes at least the standard network part, * but may may be smaller in the case of supernetting. * If it is set, we believe it. */ if (ia->ia_subnetmask == 0) { ia->ia_subnetmask = ia->ia_netmask; ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); } else ia->ia_netmask &= ia->ia_subnetmask; ia->ia_net = i & ia->ia_netmask; ia->ia_subnet = i & ia->ia_subnetmask; in_socktrim(&ia->ia_sockmask); #ifdef DEV_CARP /* * XXX: carp(4) does not have interface route */ if (ifp->if_type == IFT_CARP) return (0); #endif /* * Add route for the network. */ ia->ia_ifa.ifa_metric = ifp->if_metric; if (ifp->if_flags & IFF_BROADCAST) { ia->ia_broadaddr.sin_addr.s_addr = htonl(ia->ia_subnet | ~ia->ia_subnetmask); ia->ia_netbroadcast.s_addr = htonl(ia->ia_net | ~ ia->ia_netmask); } else if (ifp->if_flags & IFF_LOOPBACK) { ia->ia_dstaddr = ia->ia_addr; flags |= RTF_HOST; } else if (ifp->if_flags & IFF_POINTOPOINT) { if (ia->ia_dstaddr.sin_family != AF_INET) return (0); flags |= RTF_HOST; } if ((error = in_addprefix(ia, flags)) != 0) return (error); return (error); } #define rtinitflags(x) \ ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ ? RTF_HOST : 0) /* * Check if we have a route for the given prefix already or add one accordingly. */ static int in_addprefix(struct in_ifaddr *target, int flags) { INIT_VNET_INET(curvnet); struct in_ifaddr *ia; struct in_addr prefix, mask, p, m; int error; if ((flags & RTF_HOST) != 0) { prefix = target->ia_dstaddr.sin_addr; mask.s_addr = 0; } else { prefix = target->ia_addr.sin_addr; mask = target->ia_sockmask.sin_addr; prefix.s_addr &= mask.s_addr; } TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { if (rtinitflags(ia)) { p = ia->ia_addr.sin_addr; if (prefix.s_addr != p.s_addr) continue; } else { p = ia->ia_addr.sin_addr; m = ia->ia_sockmask.sin_addr; p.s_addr &= m.s_addr; if (prefix.s_addr != p.s_addr || mask.s_addr != m.s_addr) continue; } /* * If we got a matching prefix route inserted by other * interface address, we are done here. */ if (ia->ia_flags & IFA_ROUTE) { if (V_sameprefixcarponly && target->ia_ifp->if_type != IFT_CARP && ia->ia_ifp->if_type != IFT_CARP) return (EEXIST); else return (0); } } /* * No-one seem to have this prefix route, so we try to insert it. */ error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); if (!error) target->ia_flags |= IFA_ROUTE; return (error); } extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); /* * If there is no other address in the system that can serve a route to the * same prefix, remove the route. Hand over the route to the new address * otherwise. */ static int in_scrubprefix(struct in_ifaddr *target) { INIT_VNET_INET(curvnet); struct in_ifaddr *ia; struct in_addr prefix, mask, p; int error; if ((target->ia_flags & IFA_ROUTE) == 0) return (0); if (rtinitflags(target)) prefix = target->ia_dstaddr.sin_addr; else { prefix = target->ia_addr.sin_addr; mask = target->ia_sockmask.sin_addr; prefix.s_addr &= mask.s_addr; /* remove arp cache */ arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); } TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { if (rtinitflags(ia)) p = ia->ia_dstaddr.sin_addr; else { p = ia->ia_addr.sin_addr; p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; } if (prefix.s_addr != p.s_addr) continue; /* * If we got a matching prefix address, move IFA_ROUTE and * the route itself to it. Make sure that routing daemons * get a heads-up. * * XXX: a special case for carp(4) interface */ if ((ia->ia_flags & IFA_ROUTE) == 0 #ifdef DEV_CARP && (ia->ia_ifp->if_type != IFT_CARP) #endif ) { rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); target->ia_flags &= ~IFA_ROUTE; error = rtinit(&ia->ia_ifa, (int)RTM_ADD, rtinitflags(ia) | RTF_UP); if (error == 0) ia->ia_flags |= IFA_ROUTE; return (error); } } /* * As no-one seem to have this prefix, we can remove the route. */ rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); target->ia_flags &= ~IFA_ROUTE; return (0); } #undef rtinitflags /* * Return 1 if the address might be a local broadcast address. */ int in_broadcast(struct in_addr in, struct ifnet *ifp) { register struct ifaddr *ifa; u_long t; if (in.s_addr == INADDR_BROADCAST || in.s_addr == INADDR_ANY) return (1); if ((ifp->if_flags & IFF_BROADCAST) == 0) return (0); t = ntohl(in.s_addr); /* * Look through the list of addresses for a match * with a broadcast address. */ #define ia ((struct in_ifaddr *)ifa) TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) if (ifa->ifa_addr->sa_family == AF_INET && (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || in.s_addr == ia->ia_netbroadcast.s_addr || /* * Check for old-style (host 0) broadcast. */ t == ia->ia_subnet || t == ia->ia_net) && /* * Check for an all one subnetmask. These * only exist when an interface gets a secondary * address. */ ia->ia_subnetmask != (u_long)0xffffffff) return (1); return (0); #undef ia } /* * Delete all IPv4 multicast address records, and associated link-layer * multicast address records, associated with ifp. */ static void in_purgemaddrs(struct ifnet *ifp) { INIT_VNET_INET(ifp->if_vnet); struct in_multi *inm; struct in_multi *oinm; #ifdef DIAGNOSTIC printf("%s: purging ifp %p\n", __func__, ifp); #endif IFF_LOCKGIANT(ifp); IN_MULTI_LOCK(); LIST_FOREACH_SAFE(inm, &V_in_multihead, inm_link, oinm) { if (inm->inm_ifp == ifp) in_delmulti_locked(inm); } IN_MULTI_UNLOCK(); IFF_UNLOCKGIANT(ifp); } /* * On interface removal, clean up IPv4 data structures hung off of the ifnet. */ void in_ifdetach(struct ifnet *ifp) { INIT_VNET_INET(ifp->if_vnet); in_pcbpurgeif0(&V_ripcbinfo, ifp); in_pcbpurgeif0(&V_udbinfo, ifp); in_purgemaddrs(ifp); } #include #include #include struct in_llentry { struct llentry base; struct sockaddr_in l3_addr4; }; static struct llentry * in_lltable_new(const struct sockaddr *l3addr, u_int flags) { struct in_llentry *lle; lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); if (lle == NULL) /* NB: caller generates msg */ return NULL; callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); /* * For IPv4 this will trigger "arpresolve" to generate * an ARP request. */ lle->base.la_expire = time_second; /* mark expired */ lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; lle->base.lle_refcnt = 1; LLE_LOCK_INIT(&lle->base); return &lle->base; } /* * Deletes an address from the address table. * This function is called by the timer functions * such as arptimer() and nd6_llinfo_timer(), and * the caller does the locking. */ static void in_lltable_free(struct lltable *llt, struct llentry *lle) { LLE_WUNLOCK(lle); LLE_LOCK_DESTROY(lle); free(lle, M_LLTABLE); } static int in_lltable_rtcheck(struct ifnet *ifp, const struct sockaddr *l3addr) { struct rtentry *rt; KASSERT(l3addr->sa_family == AF_INET, ("sin_family %d", l3addr->sa_family)); /* XXX rtalloc1 should take a const param */ rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); if (rt != NULL) RTFREE_LOCKED(rt); return (EINVAL); } RTFREE_LOCKED(rt); return 0; } /* * Return NULL if not found or marked for deletion. * If found return lle read locked. */ static struct llentry * in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) { const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; struct ifnet *ifp = llt->llt_ifp; struct llentry *lle; struct llentries *lleh; u_int hashkey; IF_AFDATA_LOCK_ASSERT(ifp); KASSERT(l3addr->sa_family == AF_INET, ("sin_family %d", l3addr->sa_family)); hashkey = sin->sin_addr.s_addr; lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; LIST_FOREACH(lle, lleh, lle_next) { struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); if (lle->la_flags & LLE_DELETED) continue; if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) break; } if (lle == NULL) { #ifdef DIAGNOSTICS if (flags & LLE_DELETE) log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); #endif if (!(flags & LLE_CREATE)) return (NULL); /* * A route that covers the given address must have * been installed 1st because we are doing a resolution, * verify this. */ if (!(flags & LLE_IFADDR) && in_lltable_rtcheck(ifp, l3addr) != 0) goto done; lle = in_lltable_new(l3addr, flags); if (lle == NULL) { log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); goto done; } lle->la_flags = flags & ~LLE_CREATE; if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); lle->la_flags |= (LLE_VALID | LLE_STATIC); } lle->lle_tbl = llt; lle->lle_head = lleh; LIST_INSERT_HEAD(lleh, lle, lle_next); } else if (flags & LLE_DELETE) { if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { LLE_WLOCK(lle); lle->la_flags = LLE_DELETED; LLE_WUNLOCK(lle); #ifdef DIAGNOSTICS log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); #endif } lle = (void *)-1; } if (LLE_IS_VALID(lle)) { if (flags & LLE_EXCLUSIVE) LLE_WLOCK(lle); else LLE_RLOCK(lle); } done: return (lle); } static int in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) { #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) struct ifnet *ifp = llt->llt_ifp; struct llentry *lle; /* XXX stack use */ struct { struct rt_msghdr rtm; struct sockaddr_inarp sin; struct sockaddr_dl sdl; } arpc; int error, i; /* XXXXX * current IFNET_RLOCK() is mapped to IFNET_WLOCK() * so it is okay to use this ASSERT, change it when * IFNET lock is finalized */ IFNET_WLOCK_ASSERT(); error = 0; for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { struct sockaddr_dl *sdl; /* skip deleted entries */ if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) continue; /* * produce a msg made of: * struct rt_msghdr; * struct sockaddr_inarp; (IPv4) * struct sockaddr_dl; */ bzero(&arpc, sizeof(arpc)); arpc.rtm.rtm_msglen = sizeof(arpc); arpc.rtm.rtm_version = RTM_VERSION; arpc.rtm.rtm_type = RTM_GET; arpc.rtm.rtm_flags = RTF_UP; arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; arpc.sin.sin_family = AF_INET; arpc.sin.sin_len = sizeof(arpc.sin); arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; /* publish */ if (lle->la_flags & LLE_PUB) { arpc.rtm.rtm_flags |= RTF_ANNOUNCE; /* proxy only */ if (lle->la_flags & LLE_PROXY) arpc.sin.sin_other = SIN_PROXY; } sdl = &arpc.sdl; sdl->sdl_family = AF_LINK; sdl->sdl_len = sizeof(*sdl); sdl->sdl_alen = ifp->if_addrlen; sdl->sdl_index = ifp->if_index; sdl->sdl_type = ifp->if_type; bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); arpc.rtm.rtm_rmx.rmx_expire = lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); if (lle->la_flags & LLE_STATIC) arpc.rtm.rtm_flags |= RTF_STATIC; arpc.rtm.rtm_index = ifp->if_index; error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); if (error) break; } } return error; #undef SIN } void * in_domifattach(struct ifnet *ifp) { struct lltable *llt = lltable_init(ifp, AF_INET); if (llt != NULL) { llt->llt_new = in_lltable_new; llt->llt_free = in_lltable_free; llt->llt_rtcheck = in_lltable_rtcheck; llt->llt_lookup = in_lltable_lookup; llt->llt_dump = in_lltable_dump; } return (llt); } void in_domifdetach(struct ifnet *ifp __unused, void *aux) { struct lltable *llt = (struct lltable *)aux; lltable_free(llt); }