in.c revision 24204
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1982, 1986, 1991, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * Redistribution and use in source and binary forms, with or without 61541Srgrimes * modification, are permitted provided that the following conditions 71541Srgrimes * are met: 81541Srgrimes * 1. Redistributions of source code must retain the above copyright 91541Srgrimes * notice, this list of conditions and the following disclaimer. 101541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111541Srgrimes * notice, this list of conditions and the following disclaimer in the 121541Srgrimes * documentation and/or other materials provided with the distribution. 131541Srgrimes * 3. All advertising materials mentioning features or use of this software 141541Srgrimes * must display the following acknowledgement: 151541Srgrimes * This product includes software developed by the University of 161541Srgrimes * California, Berkeley and its contributors. 171541Srgrimes * 4. Neither the name of the University nor the names of its contributors 181541Srgrimes * may be used to endorse or promote products derived from this software 191541Srgrimes * without specific prior written permission. 201541Srgrimes * 211541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311541Srgrimes * SUCH DAMAGE. 321541Srgrimes * 3310939Swollman * @(#)in.c 8.4 (Berkeley) 1/9/95 3424204Sbde * $Id: in.c,v 1.32 1997/02/22 09:41:27 peter Exp $ 351541Srgrimes */ 361541Srgrimes 371541Srgrimes#include <sys/param.h> 3814546Sdg#include <sys/queue.h> 391549Srgrimes#include <sys/systm.h> 4024204Sbde#include <sys/sockio.h> 411541Srgrimes#include <sys/errno.h> 421541Srgrimes#include <sys/malloc.h> 431541Srgrimes#include <sys/socket.h> 441541Srgrimes#include <sys/socketvar.h> 4512704Sphk#include <sys/kernel.h> 4612704Sphk#include <sys/sysctl.h> 471541Srgrimes 481541Srgrimes#include <net/if.h> 491541Srgrimes#include <net/route.h> 501541Srgrimes 511541Srgrimes#include <netinet/in_systm.h> 521541Srgrimes#include <netinet/in.h> 531541Srgrimes#include <netinet/in_var.h> 541541Srgrimes#include <netinet/if_ether.h> 551541Srgrimes 566363Sphk#include <netinet/igmp_var.h> 576363Sphk 5812296Sphkstatic void in_socktrim __P((struct sockaddr_in *)); 5912296Sphkstatic int in_ifinit __P((struct ifnet *, 6012296Sphk struct in_ifaddr *, struct sockaddr_in *, int)); 611541Srgrimes 6218193Swollmanstatic int subnetsarelocal = 0; 6312704SphkSYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 6412704Sphk &subnetsarelocal, 0, ""); 6521666Swollman 6621666Swollmanstruct in_multihead in_multihead; /* XXX BSS initialization */ 6721666Swollman 681541Srgrimes/* 691541Srgrimes * Return 1 if an internet address is for a ``local'' host 701541Srgrimes * (one to which we have a connection). If subnetsarelocal 711541Srgrimes * is true, this includes other subnets of the local net. 721541Srgrimes * Otherwise, it includes only the directly-connected (sub)nets. 731541Srgrimes */ 741549Srgrimesint 751541Srgrimesin_localaddr(in) 761541Srgrimes struct in_addr in; 771541Srgrimes{ 781541Srgrimes register u_long i = ntohl(in.s_addr); 791541Srgrimes register struct in_ifaddr *ia; 801541Srgrimes 811541Srgrimes if (subnetsarelocal) { 8220407Swollman for (ia = in_ifaddrhead.tqh_first; ia; 8320407Swollman ia = ia->ia_link.tqe_next) 841541Srgrimes if ((i & ia->ia_netmask) == ia->ia_net) 851541Srgrimes return (1); 861541Srgrimes } else { 8720407Swollman for (ia = in_ifaddrhead.tqh_first; ia; 8820407Swollman ia = ia->ia_link.tqe_next) 891541Srgrimes if ((i & ia->ia_subnetmask) == ia->ia_subnet) 901541Srgrimes return (1); 911541Srgrimes } 921541Srgrimes return (0); 931541Srgrimes} 941541Srgrimes 951541Srgrimes/* 961541Srgrimes * Determine whether an IP address is in a reserved set of addresses 971541Srgrimes * that may not be forwarded, or whether datagrams to that destination 981541Srgrimes * may be forwarded. 991541Srgrimes */ 1001549Srgrimesint 1011541Srgrimesin_canforward(in) 1021541Srgrimes struct in_addr in; 1031541Srgrimes{ 1041541Srgrimes register u_long i = ntohl(in.s_addr); 1051541Srgrimes register u_long net; 1061541Srgrimes 1071541Srgrimes if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 1081541Srgrimes return (0); 1091541Srgrimes if (IN_CLASSA(i)) { 1101541Srgrimes net = i & IN_CLASSA_NET; 1111541Srgrimes if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 1121541Srgrimes return (0); 1131541Srgrimes } 1141541Srgrimes return (1); 1151541Srgrimes} 1161541Srgrimes 1171541Srgrimes/* 1181541Srgrimes * Trim a mask in a sockaddr 1191541Srgrimes */ 12012296Sphkstatic void 1211541Srgrimesin_socktrim(ap) 1221541Srgrimesstruct sockaddr_in *ap; 1231541Srgrimes{ 1241541Srgrimes register char *cplim = (char *) &ap->sin_addr; 1251541Srgrimes register char *cp = (char *) (&ap->sin_addr + 1); 1261541Srgrimes 1271541Srgrimes ap->sin_len = 0; 1284127Swollman while (--cp >= cplim) 1291541Srgrimes if (*cp) { 1301541Srgrimes (ap)->sin_len = cp - (char *) (ap) + 1; 1311541Srgrimes break; 1321541Srgrimes } 1331541Srgrimes} 1341541Srgrimes 13512704Sphkstatic int in_interfaces; /* number of external internet interfaces */ 1361541Srgrimes 1371541Srgrimes/* 1381541Srgrimes * Generic internet control operations (ioctl's). 1391541Srgrimes * Ifp is 0 if not an interface-specific ioctl. 1401541Srgrimes */ 1411541Srgrimes/* ARGSUSED */ 1421549Srgrimesint 1431541Srgrimesin_control(so, cmd, data, ifp) 1441541Srgrimes struct socket *so; 14522900Swollman int cmd; 1461541Srgrimes caddr_t data; 1471541Srgrimes register struct ifnet *ifp; 1481541Srgrimes{ 1491541Srgrimes register struct ifreq *ifr = (struct ifreq *)data; 15014632Sfenner register struct in_ifaddr *ia = 0, *iap; 1511541Srgrimes register struct ifaddr *ifa; 1521541Srgrimes struct in_ifaddr *oia; 1531541Srgrimes struct in_aliasreq *ifra = (struct in_aliasreq *)data; 1541541Srgrimes struct sockaddr_in oldaddr; 15515092Sdg int error, hostIsNew, maskIsNew, s; 1561541Srgrimes u_long i; 1571541Srgrimes 1581541Srgrimes /* 1591541Srgrimes * Find address for this interface, if it exists. 16014632Sfenner * 16114632Sfenner * If an alias address was specified, find that one instead of 16214632Sfenner * the first one on the interface. 1631541Srgrimes */ 1641541Srgrimes if (ifp) 16520407Swollman for (iap = in_ifaddrhead.tqh_first; iap; 16620407Swollman iap = iap->ia_link.tqe_next) 16714632Sfenner if (iap->ia_ifp == ifp) { 16814632Sfenner if (((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr.s_addr == 16914632Sfenner iap->ia_addr.sin_addr.s_addr) { 17014632Sfenner ia = iap; 17114632Sfenner break; 17214632Sfenner } else if (ia == NULL) { 17314632Sfenner ia = iap; 17414632Sfenner if (ifr->ifr_addr.sa_family != AF_INET) 17514632Sfenner break; 17614632Sfenner } 17714632Sfenner } 1781541Srgrimes 1791541Srgrimes switch (cmd) { 1801541Srgrimes 1811541Srgrimes case SIOCAIFADDR: 1821541Srgrimes case SIOCDIFADDR: 1838071Swollman if (ifra->ifra_addr.sin_family == AF_INET) { 18420532Swollman for (oia = ia; ia; ia = ia->ia_link.tqe_next) { 1858071Swollman if (ia->ia_ifp == ifp && 1868071Swollman ia->ia_addr.sin_addr.s_addr == 1878071Swollman ifra->ifra_addr.sin_addr.s_addr) 1888071Swollman break; 1898071Swollman } 1908876Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) 1918071Swollman && (cmd == SIOCAIFADDR) 1928071Swollman && (ifra->ifra_dstaddr.sin_addr.s_addr 1938071Swollman == INADDR_ANY)) { 1949563Swollman return EDESTADDRREQ; 1958071Swollman } 1961541Srgrimes } 1971541Srgrimes if (cmd == SIOCDIFADDR && ia == 0) 1981541Srgrimes return (EADDRNOTAVAIL); 1991541Srgrimes /* FALLTHROUGH */ 2001541Srgrimes case SIOCSIFADDR: 2011541Srgrimes case SIOCSIFNETMASK: 2021541Srgrimes case SIOCSIFDSTADDR: 2031541Srgrimes if ((so->so_state & SS_PRIV) == 0) 2041541Srgrimes return (EPERM); 2051541Srgrimes 2061541Srgrimes if (ifp == 0) 2071541Srgrimes panic("in_control"); 2081541Srgrimes if (ia == (struct in_ifaddr *)0) { 20920407Swollman ia = (struct in_ifaddr *) 21020407Swollman malloc(sizeof *ia, M_IFADDR, M_WAITOK); 21120407Swollman if (ia == (struct in_ifaddr *)NULL) 2121541Srgrimes return (ENOBUFS); 21320407Swollman bzero((caddr_t)ia, sizeof *ia); 21415092Sdg /* 21515092Sdg * Protect from ipintr() traversing address list 21615092Sdg * while we're modifying it. 21715092Sdg */ 21815092Sdg s = splnet(); 21920407Swollman 22020407Swollman TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 22120407Swollman ifa = &ia->ia_ifa; 22220407Swollman TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 22315092Sdg 22420407Swollman ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 22520407Swollman ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 22620407Swollman ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 2271541Srgrimes ia->ia_sockmask.sin_len = 8; 2281541Srgrimes if (ifp->if_flags & IFF_BROADCAST) { 2291541Srgrimes ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 2301541Srgrimes ia->ia_broadaddr.sin_family = AF_INET; 2311541Srgrimes } 2321541Srgrimes ia->ia_ifp = ifp; 2338090Spst if (!(ifp->if_flags & IFF_LOOPBACK)) 2341541Srgrimes in_interfaces++; 23515092Sdg splx(s); 2361541Srgrimes } 2371541Srgrimes break; 2381541Srgrimes 2391541Srgrimes case SIOCSIFBRDADDR: 2401541Srgrimes if ((so->so_state & SS_PRIV) == 0) 2411541Srgrimes return (EPERM); 2421541Srgrimes /* FALLTHROUGH */ 2431541Srgrimes 2441541Srgrimes case SIOCGIFADDR: 2451541Srgrimes case SIOCGIFNETMASK: 2461541Srgrimes case SIOCGIFDSTADDR: 2471541Srgrimes case SIOCGIFBRDADDR: 2481541Srgrimes if (ia == (struct in_ifaddr *)0) 2491541Srgrimes return (EADDRNOTAVAIL); 2501541Srgrimes break; 2511541Srgrimes } 2521541Srgrimes switch (cmd) { 2531541Srgrimes 2541541Srgrimes case SIOCGIFADDR: 2551541Srgrimes *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 2561541Srgrimes break; 2571541Srgrimes 2581541Srgrimes case SIOCGIFBRDADDR: 2591541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) == 0) 2601541Srgrimes return (EINVAL); 2611541Srgrimes *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 2621541Srgrimes break; 2631541Srgrimes 2641541Srgrimes case SIOCGIFDSTADDR: 2651541Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 2661541Srgrimes return (EINVAL); 2671541Srgrimes *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 2681541Srgrimes break; 2691541Srgrimes 2701541Srgrimes case SIOCGIFNETMASK: 2711541Srgrimes *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 2721541Srgrimes break; 2731541Srgrimes 2741541Srgrimes case SIOCSIFDSTADDR: 2751541Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 2761541Srgrimes return (EINVAL); 2771541Srgrimes oldaddr = ia->ia_dstaddr; 2781541Srgrimes ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 2791541Srgrimes if (ifp->if_ioctl && (error = (*ifp->if_ioctl) 2801541Srgrimes (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { 2811541Srgrimes ia->ia_dstaddr = oldaddr; 2821541Srgrimes return (error); 2831541Srgrimes } 2841541Srgrimes if (ia->ia_flags & IFA_ROUTE) { 2851541Srgrimes ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 2861541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 2871541Srgrimes ia->ia_ifa.ifa_dstaddr = 2881541Srgrimes (struct sockaddr *)&ia->ia_dstaddr; 2891541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 2901541Srgrimes } 2911541Srgrimes break; 2921541Srgrimes 2931541Srgrimes case SIOCSIFBRDADDR: 2941541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) == 0) 2951541Srgrimes return (EINVAL); 2961541Srgrimes ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 2971541Srgrimes break; 2981541Srgrimes 2991541Srgrimes case SIOCSIFADDR: 3001541Srgrimes return (in_ifinit(ifp, ia, 3011541Srgrimes (struct sockaddr_in *) &ifr->ifr_addr, 1)); 3021541Srgrimes 3031541Srgrimes case SIOCSIFNETMASK: 3041541Srgrimes i = ifra->ifra_addr.sin_addr.s_addr; 3051541Srgrimes ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr = i); 3061541Srgrimes break; 3071541Srgrimes 3081541Srgrimes case SIOCAIFADDR: 3091541Srgrimes maskIsNew = 0; 3101541Srgrimes hostIsNew = 1; 3111541Srgrimes error = 0; 3121541Srgrimes if (ia->ia_addr.sin_family == AF_INET) { 3131541Srgrimes if (ifra->ifra_addr.sin_len == 0) { 3141541Srgrimes ifra->ifra_addr = ia->ia_addr; 3151541Srgrimes hostIsNew = 0; 3161541Srgrimes } else if (ifra->ifra_addr.sin_addr.s_addr == 3171541Srgrimes ia->ia_addr.sin_addr.s_addr) 3181541Srgrimes hostIsNew = 0; 3191541Srgrimes } 3201541Srgrimes if (ifra->ifra_mask.sin_len) { 3211541Srgrimes in_ifscrub(ifp, ia); 3221541Srgrimes ia->ia_sockmask = ifra->ifra_mask; 3231541Srgrimes ia->ia_subnetmask = 3241541Srgrimes ntohl(ia->ia_sockmask.sin_addr.s_addr); 3251541Srgrimes maskIsNew = 1; 3261541Srgrimes } 3271541Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) && 3281541Srgrimes (ifra->ifra_dstaddr.sin_family == AF_INET)) { 3291541Srgrimes in_ifscrub(ifp, ia); 3301541Srgrimes ia->ia_dstaddr = ifra->ifra_dstaddr; 3311541Srgrimes maskIsNew = 1; /* We lie; but the effect's the same */ 3321541Srgrimes } 3331541Srgrimes if (ifra->ifra_addr.sin_family == AF_INET && 3341541Srgrimes (hostIsNew || maskIsNew)) 3351541Srgrimes error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 3361541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) && 3371541Srgrimes (ifra->ifra_broadaddr.sin_family == AF_INET)) 3381541Srgrimes ia->ia_broadaddr = ifra->ifra_broadaddr; 3391541Srgrimes return (error); 3401541Srgrimes 3411541Srgrimes case SIOCDIFADDR: 3421541Srgrimes in_ifscrub(ifp, ia); 34315092Sdg /* 34415092Sdg * Protect from ipintr() traversing address list 34515092Sdg * while we're modifying it. 34615092Sdg */ 34715092Sdg s = splnet(); 34815092Sdg 34920407Swollman ifa = &ia->ia_ifa; 35020407Swollman TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 3511541Srgrimes oia = ia; 35220407Swollman TAILQ_REMOVE(&in_ifaddrhead, oia, ia_link); 35321666Swollman IFAFREE(&oia->ia_ifa); 35415092Sdg splx(s); 3551541Srgrimes break; 3561541Srgrimes 3571541Srgrimes default: 3581541Srgrimes if (ifp == 0 || ifp->if_ioctl == 0) 3591541Srgrimes return (EOPNOTSUPP); 3601541Srgrimes return ((*ifp->if_ioctl)(ifp, cmd, data)); 3611541Srgrimes } 3621541Srgrimes return (0); 3631541Srgrimes} 3641541Srgrimes 3651541Srgrimes/* 3661541Srgrimes * Delete any existing route for an interface. 3671541Srgrimes */ 36822672Swollmanvoid 3691541Srgrimesin_ifscrub(ifp, ia) 3701541Srgrimes register struct ifnet *ifp; 3711541Srgrimes register struct in_ifaddr *ia; 3721541Srgrimes{ 3731541Srgrimes 3741541Srgrimes if ((ia->ia_flags & IFA_ROUTE) == 0) 3751541Srgrimes return; 3761541Srgrimes if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 3771541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 3781541Srgrimes else 3791541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); 3801541Srgrimes ia->ia_flags &= ~IFA_ROUTE; 3811541Srgrimes} 3821541Srgrimes 3831541Srgrimes/* 3841541Srgrimes * Initialize an interface's internet address 3851541Srgrimes * and routing table entry. 3861541Srgrimes */ 38712296Sphkstatic int 3881541Srgrimesin_ifinit(ifp, ia, sin, scrub) 3891541Srgrimes register struct ifnet *ifp; 3901541Srgrimes register struct in_ifaddr *ia; 3911541Srgrimes struct sockaddr_in *sin; 3921541Srgrimes int scrub; 3931541Srgrimes{ 3941541Srgrimes register u_long i = ntohl(sin->sin_addr.s_addr); 3951541Srgrimes struct sockaddr_in oldaddr; 3962112Swollman int s = splimp(), flags = RTF_UP, error; 3971541Srgrimes 3981541Srgrimes oldaddr = ia->ia_addr; 3991541Srgrimes ia->ia_addr = *sin; 4001541Srgrimes /* 4011541Srgrimes * Give the interface a chance to initialize 4021541Srgrimes * if this is its first address, 4031541Srgrimes * and to validate the address if necessary. 4041541Srgrimes */ 4051541Srgrimes if (ifp->if_ioctl && 4061541Srgrimes (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 4071541Srgrimes splx(s); 4081541Srgrimes ia->ia_addr = oldaddr; 4091541Srgrimes return (error); 4101541Srgrimes } 4111541Srgrimes splx(s); 4121541Srgrimes if (scrub) { 4131541Srgrimes ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 4141541Srgrimes in_ifscrub(ifp, ia); 4151541Srgrimes ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 4161541Srgrimes } 4171541Srgrimes if (IN_CLASSA(i)) 4181541Srgrimes ia->ia_netmask = IN_CLASSA_NET; 4191541Srgrimes else if (IN_CLASSB(i)) 4201541Srgrimes ia->ia_netmask = IN_CLASSB_NET; 4211541Srgrimes else 4221541Srgrimes ia->ia_netmask = IN_CLASSC_NET; 4231541Srgrimes /* 4241541Srgrimes * The subnet mask usually includes at least the standard network part, 4251541Srgrimes * but may may be smaller in the case of supernetting. 4261541Srgrimes * If it is set, we believe it. 4271541Srgrimes */ 4281541Srgrimes if (ia->ia_subnetmask == 0) { 4291541Srgrimes ia->ia_subnetmask = ia->ia_netmask; 4301541Srgrimes ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 4311541Srgrimes } else 4321541Srgrimes ia->ia_netmask &= ia->ia_subnetmask; 4331541Srgrimes ia->ia_net = i & ia->ia_netmask; 4341541Srgrimes ia->ia_subnet = i & ia->ia_subnetmask; 4351541Srgrimes in_socktrim(&ia->ia_sockmask); 4361541Srgrimes /* 4371541Srgrimes * Add route for the network. 4381541Srgrimes */ 4391541Srgrimes ia->ia_ifa.ifa_metric = ifp->if_metric; 4401541Srgrimes if (ifp->if_flags & IFF_BROADCAST) { 4411541Srgrimes ia->ia_broadaddr.sin_addr.s_addr = 4421541Srgrimes htonl(ia->ia_subnet | ~ia->ia_subnetmask); 4431541Srgrimes ia->ia_netbroadcast.s_addr = 4441541Srgrimes htonl(ia->ia_net | ~ ia->ia_netmask); 4451541Srgrimes } else if (ifp->if_flags & IFF_LOOPBACK) { 4461541Srgrimes ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 4471541Srgrimes flags |= RTF_HOST; 4481541Srgrimes } else if (ifp->if_flags & IFF_POINTOPOINT) { 4491541Srgrimes if (ia->ia_dstaddr.sin_family != AF_INET) 4501541Srgrimes return (0); 4511541Srgrimes flags |= RTF_HOST; 4521541Srgrimes } 4531541Srgrimes if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0) 4541541Srgrimes ia->ia_flags |= IFA_ROUTE; 4557280Swollman 4561541Srgrimes /* 4571541Srgrimes * If the interface supports multicast, join the "all hosts" 4581541Srgrimes * multicast group on that interface. 4591541Srgrimes */ 4601541Srgrimes if (ifp->if_flags & IFF_MULTICAST) { 4611541Srgrimes struct in_addr addr; 4621541Srgrimes 4631541Srgrimes addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 4641541Srgrimes in_addmulti(&addr, ifp); 4651541Srgrimes } 4661541Srgrimes return (error); 4671541Srgrimes} 4681541Srgrimes 4691541Srgrimes 4701541Srgrimes/* 4711541Srgrimes * Return 1 if the address might be a local broadcast address. 4721541Srgrimes */ 4731549Srgrimesint 4741541Srgrimesin_broadcast(in, ifp) 4751541Srgrimes struct in_addr in; 4761541Srgrimes struct ifnet *ifp; 4771541Srgrimes{ 4781541Srgrimes register struct ifaddr *ifa; 4791541Srgrimes u_long t; 4801541Srgrimes 4811541Srgrimes if (in.s_addr == INADDR_BROADCAST || 4821541Srgrimes in.s_addr == INADDR_ANY) 4831541Srgrimes return 1; 4841541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) == 0) 4851541Srgrimes return 0; 4861541Srgrimes t = ntohl(in.s_addr); 4871541Srgrimes /* 4881541Srgrimes * Look through the list of addresses for a match 4891541Srgrimes * with a broadcast address. 4901541Srgrimes */ 4911541Srgrimes#define ia ((struct in_ifaddr *)ifa) 49220407Swollman for (ifa = ifp->if_addrhead.tqh_first; ifa; 49320407Swollman ifa = ifa->ifa_link.tqe_next) 4941541Srgrimes if (ifa->ifa_addr->sa_family == AF_INET && 4951541Srgrimes (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 4961541Srgrimes in.s_addr == ia->ia_netbroadcast.s_addr || 4971541Srgrimes /* 4981541Srgrimes * Check for old-style (host 0) broadcast. 4991541Srgrimes */ 50013351Sguido t == ia->ia_subnet || t == ia->ia_net) && 50113351Sguido /* 50213351Sguido * Check for an all one subnetmask. These 50313351Sguido * only exist when an interface gets a secondary 50413351Sguido * address. 50513351Sguido */ 50613351Sguido ia->ia_subnetmask != (u_long)0xffffffff) 5071541Srgrimes return 1; 5081541Srgrimes return (0); 5091541Srgrimes#undef ia 5101541Srgrimes} 5111541Srgrimes/* 5121541Srgrimes * Add an address to the list of IP multicast addresses for a given interface. 5131541Srgrimes */ 5141541Srgrimesstruct in_multi * 5151541Srgrimesin_addmulti(ap, ifp) 5161541Srgrimes register struct in_addr *ap; 5171541Srgrimes register struct ifnet *ifp; 5181541Srgrimes{ 5191541Srgrimes register struct in_multi *inm; 52021666Swollman int error; 52121666Swollman struct sockaddr_in sin; 52221666Swollman struct ifmultiaddr *ifma; 5231541Srgrimes int s = splnet(); 5241541Srgrimes 5251541Srgrimes /* 52621666Swollman * Call generic routine to add membership or increment 52721666Swollman * refcount. It wants addresses in the form of a sockaddr, 52821666Swollman * so we build one here (being careful to zero the unused bytes). 5291541Srgrimes */ 53021666Swollman bzero(&sin, sizeof sin); 53121666Swollman sin.sin_family = AF_INET; 53221666Swollman sin.sin_len = sizeof sin; 53321666Swollman sin.sin_addr = *ap; 53421666Swollman error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 53521666Swollman if (error) { 53621666Swollman splx(s); 53721666Swollman return 0; 5381541Srgrimes } 5397280Swollman 54021666Swollman /* 54121666Swollman * If ifma->ifma_protospec is null, then if_addmulti() created 54221666Swollman * a new record. Otherwise, we are done. 54321666Swollman */ 54421666Swollman if (ifma->ifma_protospec != 0) 54521666Swollman return ifma->ifma_protospec; 54621666Swollman 54721666Swollman /* XXX - if_addmulti uses M_WAITOK. Can this really be called 54821666Swollman at interrupt time? If so, need to fix if_addmulti. XXX */ 54921666Swollman inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, M_NOWAIT); 55021666Swollman if (inm == NULL) { 55121666Swollman splx(s); 55221666Swollman return (NULL); 5531541Srgrimes } 55421666Swollman 55521666Swollman bzero(inm, sizeof *inm); 55621666Swollman inm->inm_addr = *ap; 55721666Swollman inm->inm_ifp = ifp; 55821666Swollman inm->inm_ifma = ifma; 55921666Swollman ifma->ifma_protospec = inm; 56021666Swollman LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 56121666Swollman 56221666Swollman /* 56321666Swollman * Let IGMP know that we have joined a new IP multicast group. 56421666Swollman */ 56521666Swollman igmp_joingroup(inm); 5661541Srgrimes splx(s); 5671541Srgrimes return (inm); 5681541Srgrimes} 5691541Srgrimes 5701541Srgrimes/* 5711541Srgrimes * Delete a multicast address record. 5721541Srgrimes */ 5731549Srgrimesvoid 5741541Srgrimesin_delmulti(inm) 5751541Srgrimes register struct in_multi *inm; 5761541Srgrimes{ 57721666Swollman struct ifmultiaddr *ifma = inm->inm_ifma; 5781541Srgrimes int s = splnet(); 5791541Srgrimes 58021666Swollman if (ifma->ifma_refcount == 1) { 5811541Srgrimes /* 5821541Srgrimes * No remaining claims to this record; let IGMP know that 5831541Srgrimes * we are leaving the multicast group. 5841541Srgrimes */ 5851541Srgrimes igmp_leavegroup(inm); 58621666Swollman ifma->ifma_protospec = 0; 58721666Swollman LIST_REMOVE(inm, inm_link); 5881541Srgrimes free(inm, M_IPMADDR); 5891541Srgrimes } 59021666Swollman /* XXX - should be separate API for when we have an ifma? */ 59121666Swollman if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 5921541Srgrimes splx(s); 5931541Srgrimes} 594