in.c revision 1541
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 * 331541Srgrimes * @(#)in.c 8.2 (Berkeley) 11/15/93 341541Srgrimes */ 351541Srgrimes 361541Srgrimes#include <sys/param.h> 371541Srgrimes#include <sys/ioctl.h> 381541Srgrimes#include <sys/errno.h> 391541Srgrimes#include <sys/malloc.h> 401541Srgrimes#include <sys/socket.h> 411541Srgrimes#include <sys/socketvar.h> 421541Srgrimes 431541Srgrimes#include <net/if.h> 441541Srgrimes#include <net/route.h> 451541Srgrimes 461541Srgrimes#include <netinet/in_systm.h> 471541Srgrimes#include <netinet/in.h> 481541Srgrimes#include <netinet/in_var.h> 491541Srgrimes#include <netinet/if_ether.h> 501541Srgrimes 511541Srgrimes#ifdef INET 521541Srgrimes/* 531541Srgrimes * Return the network number from an internet address. 541541Srgrimes */ 551541Srgrimesu_long 561541Srgrimesin_netof(in) 571541Srgrimes struct in_addr in; 581541Srgrimes{ 591541Srgrimes register u_long i = ntohl(in.s_addr); 601541Srgrimes register u_long net; 611541Srgrimes register struct in_ifaddr *ia; 621541Srgrimes 631541Srgrimes if (IN_CLASSA(i)) 641541Srgrimes net = i & IN_CLASSA_NET; 651541Srgrimes else if (IN_CLASSB(i)) 661541Srgrimes net = i & IN_CLASSB_NET; 671541Srgrimes else if (IN_CLASSC(i)) 681541Srgrimes net = i & IN_CLASSC_NET; 691541Srgrimes else if (IN_CLASSD(i)) 701541Srgrimes net = i & IN_CLASSD_NET; 711541Srgrimes else 721541Srgrimes return (0); 731541Srgrimes 741541Srgrimes /* 751541Srgrimes * Check whether network is a subnet; 761541Srgrimes * if so, return subnet number. 771541Srgrimes */ 781541Srgrimes for (ia = in_ifaddr; ia; ia = ia->ia_next) 791541Srgrimes if (net == ia->ia_net) 801541Srgrimes return (i & ia->ia_subnetmask); 811541Srgrimes return (net); 821541Srgrimes} 831541Srgrimes 841541Srgrimes#ifndef SUBNETSARELOCAL 851541Srgrimes#define SUBNETSARELOCAL 1 861541Srgrimes#endif 871541Srgrimesint subnetsarelocal = SUBNETSARELOCAL; 881541Srgrimes/* 891541Srgrimes * Return 1 if an internet address is for a ``local'' host 901541Srgrimes * (one to which we have a connection). If subnetsarelocal 911541Srgrimes * is true, this includes other subnets of the local net. 921541Srgrimes * Otherwise, it includes only the directly-connected (sub)nets. 931541Srgrimes */ 941541Srgrimesin_localaddr(in) 951541Srgrimes struct in_addr in; 961541Srgrimes{ 971541Srgrimes register u_long i = ntohl(in.s_addr); 981541Srgrimes register struct in_ifaddr *ia; 991541Srgrimes 1001541Srgrimes if (subnetsarelocal) { 1011541Srgrimes for (ia = in_ifaddr; ia; ia = ia->ia_next) 1021541Srgrimes if ((i & ia->ia_netmask) == ia->ia_net) 1031541Srgrimes return (1); 1041541Srgrimes } else { 1051541Srgrimes for (ia = in_ifaddr; ia; ia = ia->ia_next) 1061541Srgrimes if ((i & ia->ia_subnetmask) == ia->ia_subnet) 1071541Srgrimes return (1); 1081541Srgrimes } 1091541Srgrimes return (0); 1101541Srgrimes} 1111541Srgrimes 1121541Srgrimes/* 1131541Srgrimes * Determine whether an IP address is in a reserved set of addresses 1141541Srgrimes * that may not be forwarded, or whether datagrams to that destination 1151541Srgrimes * may be forwarded. 1161541Srgrimes */ 1171541Srgrimesin_canforward(in) 1181541Srgrimes struct in_addr in; 1191541Srgrimes{ 1201541Srgrimes register u_long i = ntohl(in.s_addr); 1211541Srgrimes register u_long net; 1221541Srgrimes 1231541Srgrimes if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 1241541Srgrimes return (0); 1251541Srgrimes if (IN_CLASSA(i)) { 1261541Srgrimes net = i & IN_CLASSA_NET; 1271541Srgrimes if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 1281541Srgrimes return (0); 1291541Srgrimes } 1301541Srgrimes return (1); 1311541Srgrimes} 1321541Srgrimes 1331541Srgrimes/* 1341541Srgrimes * Trim a mask in a sockaddr 1351541Srgrimes */ 1361541Srgrimesvoid 1371541Srgrimesin_socktrim(ap) 1381541Srgrimesstruct sockaddr_in *ap; 1391541Srgrimes{ 1401541Srgrimes register char *cplim = (char *) &ap->sin_addr; 1411541Srgrimes register char *cp = (char *) (&ap->sin_addr + 1); 1421541Srgrimes 1431541Srgrimes ap->sin_len = 0; 1441541Srgrimes while (--cp > cplim) 1451541Srgrimes if (*cp) { 1461541Srgrimes (ap)->sin_len = cp - (char *) (ap) + 1; 1471541Srgrimes break; 1481541Srgrimes } 1491541Srgrimes} 1501541Srgrimes 1511541Srgrimesint in_interfaces; /* number of external internet interfaces */ 1521541Srgrimesextern struct ifnet loif; 1531541Srgrimes 1541541Srgrimes/* 1551541Srgrimes * Generic internet control operations (ioctl's). 1561541Srgrimes * Ifp is 0 if not an interface-specific ioctl. 1571541Srgrimes */ 1581541Srgrimes/* ARGSUSED */ 1591541Srgrimesin_control(so, cmd, data, ifp) 1601541Srgrimes struct socket *so; 1611541Srgrimes int cmd; 1621541Srgrimes caddr_t data; 1631541Srgrimes register struct ifnet *ifp; 1641541Srgrimes{ 1651541Srgrimes register struct ifreq *ifr = (struct ifreq *)data; 1661541Srgrimes register struct in_ifaddr *ia = 0; 1671541Srgrimes register struct ifaddr *ifa; 1681541Srgrimes struct in_ifaddr *oia; 1691541Srgrimes struct in_aliasreq *ifra = (struct in_aliasreq *)data; 1701541Srgrimes struct sockaddr_in oldaddr; 1711541Srgrimes int error, hostIsNew, maskIsNew; 1721541Srgrimes u_long i; 1731541Srgrimes 1741541Srgrimes /* 1751541Srgrimes * Find address for this interface, if it exists. 1761541Srgrimes */ 1771541Srgrimes if (ifp) 1781541Srgrimes for (ia = in_ifaddr; ia; ia = ia->ia_next) 1791541Srgrimes if (ia->ia_ifp == ifp) 1801541Srgrimes break; 1811541Srgrimes 1821541Srgrimes switch (cmd) { 1831541Srgrimes 1841541Srgrimes case SIOCAIFADDR: 1851541Srgrimes case SIOCDIFADDR: 1861541Srgrimes if (ifra->ifra_addr.sin_family == AF_INET) 1871541Srgrimes for (oia = ia; ia; ia = ia->ia_next) { 1881541Srgrimes if (ia->ia_ifp == ifp && 1891541Srgrimes ia->ia_addr.sin_addr.s_addr == 1901541Srgrimes ifra->ifra_addr.sin_addr.s_addr) 1911541Srgrimes break; 1921541Srgrimes } 1931541Srgrimes if (cmd == SIOCDIFADDR && ia == 0) 1941541Srgrimes return (EADDRNOTAVAIL); 1951541Srgrimes /* FALLTHROUGH */ 1961541Srgrimes case SIOCSIFADDR: 1971541Srgrimes case SIOCSIFNETMASK: 1981541Srgrimes case SIOCSIFDSTADDR: 1991541Srgrimes if ((so->so_state & SS_PRIV) == 0) 2001541Srgrimes return (EPERM); 2011541Srgrimes 2021541Srgrimes if (ifp == 0) 2031541Srgrimes panic("in_control"); 2041541Srgrimes if (ia == (struct in_ifaddr *)0) { 2051541Srgrimes oia = (struct in_ifaddr *) 2061541Srgrimes malloc(sizeof *oia, M_IFADDR, M_WAITOK); 2071541Srgrimes if (oia == (struct in_ifaddr *)NULL) 2081541Srgrimes return (ENOBUFS); 2091541Srgrimes bzero((caddr_t)oia, sizeof *oia); 2101541Srgrimes if (ia = in_ifaddr) { 2111541Srgrimes for ( ; ia->ia_next; ia = ia->ia_next) 2121541Srgrimes continue; 2131541Srgrimes ia->ia_next = oia; 2141541Srgrimes } else 2151541Srgrimes in_ifaddr = oia; 2161541Srgrimes ia = oia; 2171541Srgrimes if (ifa = ifp->if_addrlist) { 2181541Srgrimes for ( ; ifa->ifa_next; ifa = ifa->ifa_next) 2191541Srgrimes continue; 2201541Srgrimes ifa->ifa_next = (struct ifaddr *) ia; 2211541Srgrimes } else 2221541Srgrimes ifp->if_addrlist = (struct ifaddr *) ia; 2231541Srgrimes ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 2241541Srgrimes ia->ia_ifa.ifa_dstaddr 2251541Srgrimes = (struct sockaddr *)&ia->ia_dstaddr; 2261541Srgrimes ia->ia_ifa.ifa_netmask 2271541Srgrimes = (struct sockaddr *)&ia->ia_sockmask; 2281541Srgrimes ia->ia_sockmask.sin_len = 8; 2291541Srgrimes if (ifp->if_flags & IFF_BROADCAST) { 2301541Srgrimes ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 2311541Srgrimes ia->ia_broadaddr.sin_family = AF_INET; 2321541Srgrimes } 2331541Srgrimes ia->ia_ifp = ifp; 2341541Srgrimes if (ifp != &loif) 2351541Srgrimes in_interfaces++; 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); 3431541Srgrimes if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia) 3441541Srgrimes ifp->if_addrlist = ifa->ifa_next; 3451541Srgrimes else { 3461541Srgrimes while (ifa->ifa_next && 3471541Srgrimes (ifa->ifa_next != (struct ifaddr *)ia)) 3481541Srgrimes ifa = ifa->ifa_next; 3491541Srgrimes if (ifa->ifa_next) 3501541Srgrimes ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next; 3511541Srgrimes else 3521541Srgrimes printf("Couldn't unlink inifaddr from ifp\n"); 3531541Srgrimes } 3541541Srgrimes oia = ia; 3551541Srgrimes if (oia == (ia = in_ifaddr)) 3561541Srgrimes in_ifaddr = ia->ia_next; 3571541Srgrimes else { 3581541Srgrimes while (ia->ia_next && (ia->ia_next != oia)) 3591541Srgrimes ia = ia->ia_next; 3601541Srgrimes if (ia->ia_next) 3611541Srgrimes ia->ia_next = oia->ia_next; 3621541Srgrimes else 3631541Srgrimes printf("Didn't unlink inifadr from list\n"); 3641541Srgrimes } 3651541Srgrimes IFAFREE((&oia->ia_ifa)); 3661541Srgrimes break; 3671541Srgrimes 3681541Srgrimes default: 3691541Srgrimes if (ifp == 0 || ifp->if_ioctl == 0) 3701541Srgrimes return (EOPNOTSUPP); 3711541Srgrimes return ((*ifp->if_ioctl)(ifp, cmd, data)); 3721541Srgrimes } 3731541Srgrimes return (0); 3741541Srgrimes} 3751541Srgrimes 3761541Srgrimes/* 3771541Srgrimes * Delete any existing route for an interface. 3781541Srgrimes */ 3791541Srgrimesvoid 3801541Srgrimesin_ifscrub(ifp, ia) 3811541Srgrimes register struct ifnet *ifp; 3821541Srgrimes register struct in_ifaddr *ia; 3831541Srgrimes{ 3841541Srgrimes 3851541Srgrimes if ((ia->ia_flags & IFA_ROUTE) == 0) 3861541Srgrimes return; 3871541Srgrimes if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 3881541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 3891541Srgrimes else 3901541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); 3911541Srgrimes ia->ia_flags &= ~IFA_ROUTE; 3921541Srgrimes} 3931541Srgrimes 3941541Srgrimes/* 3951541Srgrimes * Initialize an interface's internet address 3961541Srgrimes * and routing table entry. 3971541Srgrimes */ 3981541Srgrimesin_ifinit(ifp, ia, sin, scrub) 3991541Srgrimes register struct ifnet *ifp; 4001541Srgrimes register struct in_ifaddr *ia; 4011541Srgrimes struct sockaddr_in *sin; 4021541Srgrimes int scrub; 4031541Srgrimes{ 4041541Srgrimes register u_long i = ntohl(sin->sin_addr.s_addr); 4051541Srgrimes struct sockaddr_in oldaddr; 4061541Srgrimes int s = splimp(), flags = RTF_UP, error, ether_output(); 4071541Srgrimes 4081541Srgrimes oldaddr = ia->ia_addr; 4091541Srgrimes ia->ia_addr = *sin; 4101541Srgrimes /* 4111541Srgrimes * Give the interface a chance to initialize 4121541Srgrimes * if this is its first address, 4131541Srgrimes * and to validate the address if necessary. 4141541Srgrimes */ 4151541Srgrimes if (ifp->if_ioctl && 4161541Srgrimes (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 4171541Srgrimes splx(s); 4181541Srgrimes ia->ia_addr = oldaddr; 4191541Srgrimes return (error); 4201541Srgrimes } 4211541Srgrimes if (ifp->if_output == ether_output) { /* XXX: Another Kludge */ 4221541Srgrimes ia->ia_ifa.ifa_rtrequest = arp_rtrequest; 4231541Srgrimes ia->ia_ifa.ifa_flags |= RTF_CLONING; 4241541Srgrimes } 4251541Srgrimes splx(s); 4261541Srgrimes if (scrub) { 4271541Srgrimes ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 4281541Srgrimes in_ifscrub(ifp, ia); 4291541Srgrimes ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 4301541Srgrimes } 4311541Srgrimes if (IN_CLASSA(i)) 4321541Srgrimes ia->ia_netmask = IN_CLASSA_NET; 4331541Srgrimes else if (IN_CLASSB(i)) 4341541Srgrimes ia->ia_netmask = IN_CLASSB_NET; 4351541Srgrimes else 4361541Srgrimes ia->ia_netmask = IN_CLASSC_NET; 4371541Srgrimes /* 4381541Srgrimes * The subnet mask usually includes at least the standard network part, 4391541Srgrimes * but may may be smaller in the case of supernetting. 4401541Srgrimes * If it is set, we believe it. 4411541Srgrimes */ 4421541Srgrimes if (ia->ia_subnetmask == 0) { 4431541Srgrimes ia->ia_subnetmask = ia->ia_netmask; 4441541Srgrimes ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 4451541Srgrimes } else 4461541Srgrimes ia->ia_netmask &= ia->ia_subnetmask; 4471541Srgrimes ia->ia_net = i & ia->ia_netmask; 4481541Srgrimes ia->ia_subnet = i & ia->ia_subnetmask; 4491541Srgrimes in_socktrim(&ia->ia_sockmask); 4501541Srgrimes /* 4511541Srgrimes * Add route for the network. 4521541Srgrimes */ 4531541Srgrimes ia->ia_ifa.ifa_metric = ifp->if_metric; 4541541Srgrimes if (ifp->if_flags & IFF_BROADCAST) { 4551541Srgrimes ia->ia_broadaddr.sin_addr.s_addr = 4561541Srgrimes htonl(ia->ia_subnet | ~ia->ia_subnetmask); 4571541Srgrimes ia->ia_netbroadcast.s_addr = 4581541Srgrimes htonl(ia->ia_net | ~ ia->ia_netmask); 4591541Srgrimes } else if (ifp->if_flags & IFF_LOOPBACK) { 4601541Srgrimes ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 4611541Srgrimes flags |= RTF_HOST; 4621541Srgrimes } else if (ifp->if_flags & IFF_POINTOPOINT) { 4631541Srgrimes if (ia->ia_dstaddr.sin_family != AF_INET) 4641541Srgrimes return (0); 4651541Srgrimes flags |= RTF_HOST; 4661541Srgrimes } 4671541Srgrimes if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0) 4681541Srgrimes ia->ia_flags |= IFA_ROUTE; 4691541Srgrimes /* 4701541Srgrimes * If the interface supports multicast, join the "all hosts" 4711541Srgrimes * multicast group on that interface. 4721541Srgrimes */ 4731541Srgrimes if (ifp->if_flags & IFF_MULTICAST) { 4741541Srgrimes struct in_addr addr; 4751541Srgrimes 4761541Srgrimes addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 4771541Srgrimes in_addmulti(&addr, ifp); 4781541Srgrimes } 4791541Srgrimes return (error); 4801541Srgrimes} 4811541Srgrimes 4821541Srgrimes 4831541Srgrimes/* 4841541Srgrimes * Return 1 if the address might be a local broadcast address. 4851541Srgrimes */ 4861541Srgrimesin_broadcast(in, ifp) 4871541Srgrimes struct in_addr in; 4881541Srgrimes struct ifnet *ifp; 4891541Srgrimes{ 4901541Srgrimes register struct ifaddr *ifa; 4911541Srgrimes u_long t; 4921541Srgrimes 4931541Srgrimes if (in.s_addr == INADDR_BROADCAST || 4941541Srgrimes in.s_addr == INADDR_ANY) 4951541Srgrimes return 1; 4961541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) == 0) 4971541Srgrimes return 0; 4981541Srgrimes t = ntohl(in.s_addr); 4991541Srgrimes /* 5001541Srgrimes * Look through the list of addresses for a match 5011541Srgrimes * with a broadcast address. 5021541Srgrimes */ 5031541Srgrimes#define ia ((struct in_ifaddr *)ifa) 5041541Srgrimes for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 5051541Srgrimes if (ifa->ifa_addr->sa_family == AF_INET && 5061541Srgrimes (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 5071541Srgrimes in.s_addr == ia->ia_netbroadcast.s_addr || 5081541Srgrimes /* 5091541Srgrimes * Check for old-style (host 0) broadcast. 5101541Srgrimes */ 5111541Srgrimes t == ia->ia_subnet || t == ia->ia_net)) 5121541Srgrimes return 1; 5131541Srgrimes return (0); 5141541Srgrimes#undef ia 5151541Srgrimes} 5161541Srgrimes/* 5171541Srgrimes * Add an address to the list of IP multicast addresses for a given interface. 5181541Srgrimes */ 5191541Srgrimesstruct in_multi * 5201541Srgrimesin_addmulti(ap, ifp) 5211541Srgrimes register struct in_addr *ap; 5221541Srgrimes register struct ifnet *ifp; 5231541Srgrimes{ 5241541Srgrimes register struct in_multi *inm; 5251541Srgrimes struct ifreq ifr; 5261541Srgrimes struct in_ifaddr *ia; 5271541Srgrimes int s = splnet(); 5281541Srgrimes 5291541Srgrimes /* 5301541Srgrimes * See if address already in list. 5311541Srgrimes */ 5321541Srgrimes IN_LOOKUP_MULTI(*ap, ifp, inm); 5331541Srgrimes if (inm != NULL) { 5341541Srgrimes /* 5351541Srgrimes * Found it; just increment the reference count. 5361541Srgrimes */ 5371541Srgrimes ++inm->inm_refcount; 5381541Srgrimes } 5391541Srgrimes else { 5401541Srgrimes /* 5411541Srgrimes * New address; allocate a new multicast record 5421541Srgrimes * and link it into the interface's multicast list. 5431541Srgrimes */ 5441541Srgrimes inm = (struct in_multi *)malloc(sizeof(*inm), 5451541Srgrimes M_IPMADDR, M_NOWAIT); 5461541Srgrimes if (inm == NULL) { 5471541Srgrimes splx(s); 5481541Srgrimes return (NULL); 5491541Srgrimes } 5501541Srgrimes inm->inm_addr = *ap; 5511541Srgrimes inm->inm_ifp = ifp; 5521541Srgrimes inm->inm_refcount = 1; 5531541Srgrimes IFP_TO_IA(ifp, ia); 5541541Srgrimes if (ia == NULL) { 5551541Srgrimes free(inm, M_IPMADDR); 5561541Srgrimes splx(s); 5571541Srgrimes return (NULL); 5581541Srgrimes } 5591541Srgrimes inm->inm_ia = ia; 5601541Srgrimes inm->inm_next = ia->ia_multiaddrs; 5611541Srgrimes ia->ia_multiaddrs = inm; 5621541Srgrimes /* 5631541Srgrimes * Ask the network driver to update its multicast reception 5641541Srgrimes * filter appropriately for the new address. 5651541Srgrimes */ 5661541Srgrimes ((struct sockaddr_in *)&ifr.ifr_addr)->sin_family = AF_INET; 5671541Srgrimes ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr = *ap; 5681541Srgrimes if ((ifp->if_ioctl == NULL) || 5691541Srgrimes (*ifp->if_ioctl)(ifp, SIOCADDMULTI,(caddr_t)&ifr) != 0) { 5701541Srgrimes ia->ia_multiaddrs = inm->inm_next; 5711541Srgrimes free(inm, M_IPMADDR); 5721541Srgrimes splx(s); 5731541Srgrimes return (NULL); 5741541Srgrimes } 5751541Srgrimes /* 5761541Srgrimes * Let IGMP know that we have joined a new IP multicast group. 5771541Srgrimes */ 5781541Srgrimes igmp_joingroup(inm); 5791541Srgrimes } 5801541Srgrimes splx(s); 5811541Srgrimes return (inm); 5821541Srgrimes} 5831541Srgrimes 5841541Srgrimes/* 5851541Srgrimes * Delete a multicast address record. 5861541Srgrimes */ 5871541Srgrimesint 5881541Srgrimesin_delmulti(inm) 5891541Srgrimes register struct in_multi *inm; 5901541Srgrimes{ 5911541Srgrimes register struct in_multi **p; 5921541Srgrimes struct ifreq ifr; 5931541Srgrimes int s = splnet(); 5941541Srgrimes 5951541Srgrimes if (--inm->inm_refcount == 0) { 5961541Srgrimes /* 5971541Srgrimes * No remaining claims to this record; let IGMP know that 5981541Srgrimes * we are leaving the multicast group. 5991541Srgrimes */ 6001541Srgrimes igmp_leavegroup(inm); 6011541Srgrimes /* 6021541Srgrimes * Unlink from list. 6031541Srgrimes */ 6041541Srgrimes for (p = &inm->inm_ia->ia_multiaddrs; 6051541Srgrimes *p != inm; 6061541Srgrimes p = &(*p)->inm_next) 6071541Srgrimes continue; 6081541Srgrimes *p = (*p)->inm_next; 6091541Srgrimes /* 6101541Srgrimes * Notify the network driver to update its multicast reception 6111541Srgrimes * filter. 6121541Srgrimes */ 6131541Srgrimes ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; 6141541Srgrimes ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr = 6151541Srgrimes inm->inm_addr; 6161541Srgrimes (*inm->inm_ifp->if_ioctl)(inm->inm_ifp, SIOCDELMULTI, 6171541Srgrimes (caddr_t)&ifr); 6181541Srgrimes free(inm, M_IPMADDR); 6191541Srgrimes } 6201541Srgrimes splx(s); 6211541Srgrimes} 6221541Srgrimes#endif 623