in.c revision 8876
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 348876Srgrimes * $Id: in.c,v 1.13 1995/04/26 18:10:54 pst Exp $ 351541Srgrimes */ 361541Srgrimes 371541Srgrimes#include <sys/param.h> 381549Srgrimes#include <sys/systm.h> 391541Srgrimes#include <sys/ioctl.h> 401541Srgrimes#include <sys/errno.h> 411541Srgrimes#include <sys/malloc.h> 421541Srgrimes#include <sys/socket.h> 431541Srgrimes#include <sys/socketvar.h> 447280Swollman#include <sys/queue.h> 451541Srgrimes 461541Srgrimes#include <net/if.h> 471541Srgrimes#include <net/route.h> 481541Srgrimes 491541Srgrimes#include <netinet/in_systm.h> 501541Srgrimes#include <netinet/in.h> 511541Srgrimes#include <netinet/in_var.h> 521541Srgrimes#include <netinet/if_ether.h> 531541Srgrimes 546363Sphk#include <netinet/igmp_var.h> 556363Sphk 561541Srgrimes/* 577280Swollman * This structure is used to keep track of in_multi chains which belong to 587280Swollman * deleted interface addresses. 597280Swollman */ 607280Swollmanstatic LIST_HEAD(, multi_kludge) in_mk; /* XXX BSS initialization */ 617280Swollman 627280Swollmanstruct multi_kludge { 637280Swollman LIST_ENTRY(multi_kludge) mk_entry; 647280Swollman struct ifnet *mk_ifp; 657280Swollman struct in_multihead mk_head; 667280Swollman}; 677280Swollman 687280Swollman/* 691541Srgrimes * Return the network number from an internet address. 701541Srgrimes */ 711541Srgrimesu_long 721541Srgrimesin_netof(in) 731541Srgrimes struct in_addr in; 741541Srgrimes{ 751541Srgrimes register u_long i = ntohl(in.s_addr); 761541Srgrimes register u_long net; 771541Srgrimes register struct in_ifaddr *ia; 781541Srgrimes 791541Srgrimes if (IN_CLASSA(i)) 801541Srgrimes net = i & IN_CLASSA_NET; 811541Srgrimes else if (IN_CLASSB(i)) 821541Srgrimes net = i & IN_CLASSB_NET; 831541Srgrimes else if (IN_CLASSC(i)) 841541Srgrimes net = i & IN_CLASSC_NET; 851541Srgrimes else if (IN_CLASSD(i)) 861541Srgrimes net = i & IN_CLASSD_NET; 871541Srgrimes else 881541Srgrimes return (0); 891541Srgrimes 901541Srgrimes /* 911541Srgrimes * Check whether network is a subnet; 921541Srgrimes * if so, return subnet number. 931541Srgrimes */ 941541Srgrimes for (ia = in_ifaddr; ia; ia = ia->ia_next) 951541Srgrimes if (net == ia->ia_net) 961541Srgrimes return (i & ia->ia_subnetmask); 971541Srgrimes return (net); 981541Srgrimes} 991541Srgrimes 1001541Srgrimes#ifndef SUBNETSARELOCAL 1011541Srgrimes#define SUBNETSARELOCAL 1 1021541Srgrimes#endif 1031541Srgrimesint subnetsarelocal = SUBNETSARELOCAL; 1041541Srgrimes/* 1051541Srgrimes * Return 1 if an internet address is for a ``local'' host 1061541Srgrimes * (one to which we have a connection). If subnetsarelocal 1071541Srgrimes * is true, this includes other subnets of the local net. 1081541Srgrimes * Otherwise, it includes only the directly-connected (sub)nets. 1091541Srgrimes */ 1101549Srgrimesint 1111541Srgrimesin_localaddr(in) 1121541Srgrimes struct in_addr in; 1131541Srgrimes{ 1141541Srgrimes register u_long i = ntohl(in.s_addr); 1151541Srgrimes register struct in_ifaddr *ia; 1161541Srgrimes 1171541Srgrimes if (subnetsarelocal) { 1181541Srgrimes for (ia = in_ifaddr; ia; ia = ia->ia_next) 1191541Srgrimes if ((i & ia->ia_netmask) == ia->ia_net) 1201541Srgrimes return (1); 1211541Srgrimes } else { 1221541Srgrimes for (ia = in_ifaddr; ia; ia = ia->ia_next) 1231541Srgrimes if ((i & ia->ia_subnetmask) == ia->ia_subnet) 1241541Srgrimes return (1); 1251541Srgrimes } 1261541Srgrimes return (0); 1271541Srgrimes} 1281541Srgrimes 1291541Srgrimes/* 1301541Srgrimes * Determine whether an IP address is in a reserved set of addresses 1311541Srgrimes * that may not be forwarded, or whether datagrams to that destination 1321541Srgrimes * may be forwarded. 1331541Srgrimes */ 1341549Srgrimesint 1351541Srgrimesin_canforward(in) 1361541Srgrimes struct in_addr in; 1371541Srgrimes{ 1381541Srgrimes register u_long i = ntohl(in.s_addr); 1391541Srgrimes register u_long net; 1401541Srgrimes 1411541Srgrimes if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 1421541Srgrimes return (0); 1431541Srgrimes if (IN_CLASSA(i)) { 1441541Srgrimes net = i & IN_CLASSA_NET; 1451541Srgrimes if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 1461541Srgrimes return (0); 1471541Srgrimes } 1481541Srgrimes return (1); 1491541Srgrimes} 1501541Srgrimes 1511541Srgrimes/* 1521541Srgrimes * Trim a mask in a sockaddr 1531541Srgrimes */ 1541541Srgrimesvoid 1551541Srgrimesin_socktrim(ap) 1561541Srgrimesstruct sockaddr_in *ap; 1571541Srgrimes{ 1581541Srgrimes register char *cplim = (char *) &ap->sin_addr; 1591541Srgrimes register char *cp = (char *) (&ap->sin_addr + 1); 1601541Srgrimes 1611541Srgrimes ap->sin_len = 0; 1624127Swollman while (--cp >= cplim) 1631541Srgrimes if (*cp) { 1641541Srgrimes (ap)->sin_len = cp - (char *) (ap) + 1; 1651541Srgrimes break; 1661541Srgrimes } 1671541Srgrimes} 1681541Srgrimes 1691541Srgrimesint in_interfaces; /* number of external internet interfaces */ 1701541Srgrimes 1711541Srgrimes/* 1721541Srgrimes * Generic internet control operations (ioctl's). 1731541Srgrimes * Ifp is 0 if not an interface-specific ioctl. 1741541Srgrimes */ 1751541Srgrimes/* ARGSUSED */ 1761549Srgrimesint 1771541Srgrimesin_control(so, cmd, data, ifp) 1781541Srgrimes struct socket *so; 1791541Srgrimes int cmd; 1801541Srgrimes caddr_t data; 1811541Srgrimes register struct ifnet *ifp; 1821541Srgrimes{ 1831541Srgrimes register struct ifreq *ifr = (struct ifreq *)data; 1841541Srgrimes register struct in_ifaddr *ia = 0; 1851541Srgrimes register struct ifaddr *ifa; 1861541Srgrimes struct in_ifaddr *oia; 1871541Srgrimes struct in_aliasreq *ifra = (struct in_aliasreq *)data; 1881541Srgrimes struct sockaddr_in oldaddr; 1891541Srgrimes int error, hostIsNew, maskIsNew; 1901541Srgrimes u_long i; 1917280Swollman struct multi_kludge *mk; 1921541Srgrimes 1931541Srgrimes /* 1941541Srgrimes * Find address for this interface, if it exists. 1951541Srgrimes */ 1961541Srgrimes if (ifp) 1971541Srgrimes for (ia = in_ifaddr; ia; ia = ia->ia_next) 1981541Srgrimes if (ia->ia_ifp == ifp) 1991541Srgrimes break; 2001541Srgrimes 2011541Srgrimes switch (cmd) { 2021541Srgrimes 2031541Srgrimes case SIOCAIFADDR: 2041541Srgrimes case SIOCDIFADDR: 2058071Swollman if (ifra->ifra_addr.sin_family == AF_INET) { 2068071Swollman for (oia = ia; ia; ia = ia->ia_next) { 2078071Swollman if (ia->ia_ifp == ifp && 2088071Swollman ia->ia_addr.sin_addr.s_addr == 2098071Swollman ifra->ifra_addr.sin_addr.s_addr) 2108071Swollman break; 2118071Swollman } 2128876Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) 2138071Swollman && (cmd == SIOCAIFADDR) 2148071Swollman && (ifra->ifra_dstaddr.sin_addr.s_addr 2158071Swollman == INADDR_ANY)) { 2168071Swollman return EADDRNOTAVAIL; 2178071Swollman } 2181541Srgrimes } 2191541Srgrimes if (cmd == SIOCDIFADDR && ia == 0) 2201541Srgrimes return (EADDRNOTAVAIL); 2211541Srgrimes /* FALLTHROUGH */ 2221541Srgrimes case SIOCSIFADDR: 2231541Srgrimes case SIOCSIFNETMASK: 2241541Srgrimes case SIOCSIFDSTADDR: 2251541Srgrimes if ((so->so_state & SS_PRIV) == 0) 2261541Srgrimes return (EPERM); 2271541Srgrimes 2281541Srgrimes if (ifp == 0) 2291541Srgrimes panic("in_control"); 2301541Srgrimes if (ia == (struct in_ifaddr *)0) { 2311541Srgrimes oia = (struct in_ifaddr *) 2321541Srgrimes malloc(sizeof *oia, M_IFADDR, M_WAITOK); 2331541Srgrimes if (oia == (struct in_ifaddr *)NULL) 2341541Srgrimes return (ENOBUFS); 2351541Srgrimes bzero((caddr_t)oia, sizeof *oia); 2363311Sphk ia = in_ifaddr; 2373311Sphk if (ia) { 2381541Srgrimes for ( ; ia->ia_next; ia = ia->ia_next) 2391541Srgrimes continue; 2401541Srgrimes ia->ia_next = oia; 2411541Srgrimes } else 2421541Srgrimes in_ifaddr = oia; 2431541Srgrimes ia = oia; 2443311Sphk ifa = ifp->if_addrlist; 2453311Sphk if (ifa) { 2461541Srgrimes for ( ; ifa->ifa_next; ifa = ifa->ifa_next) 2471541Srgrimes continue; 2481541Srgrimes ifa->ifa_next = (struct ifaddr *) ia; 2491541Srgrimes } else 2501541Srgrimes ifp->if_addrlist = (struct ifaddr *) ia; 2511541Srgrimes ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 2521541Srgrimes ia->ia_ifa.ifa_dstaddr 2531541Srgrimes = (struct sockaddr *)&ia->ia_dstaddr; 2541541Srgrimes ia->ia_ifa.ifa_netmask 2551541Srgrimes = (struct sockaddr *)&ia->ia_sockmask; 2561541Srgrimes ia->ia_sockmask.sin_len = 8; 2571541Srgrimes if (ifp->if_flags & IFF_BROADCAST) { 2581541Srgrimes ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 2591541Srgrimes ia->ia_broadaddr.sin_family = AF_INET; 2601541Srgrimes } 2611541Srgrimes ia->ia_ifp = ifp; 2628090Spst if (!(ifp->if_flags & IFF_LOOPBACK)) 2631541Srgrimes in_interfaces++; 2641541Srgrimes } 2651541Srgrimes break; 2661541Srgrimes 2671541Srgrimes case SIOCSIFBRDADDR: 2681541Srgrimes if ((so->so_state & SS_PRIV) == 0) 2691541Srgrimes return (EPERM); 2701541Srgrimes /* FALLTHROUGH */ 2711541Srgrimes 2721541Srgrimes case SIOCGIFADDR: 2731541Srgrimes case SIOCGIFNETMASK: 2741541Srgrimes case SIOCGIFDSTADDR: 2751541Srgrimes case SIOCGIFBRDADDR: 2761541Srgrimes if (ia == (struct in_ifaddr *)0) 2771541Srgrimes return (EADDRNOTAVAIL); 2781541Srgrimes break; 2791541Srgrimes } 2801541Srgrimes switch (cmd) { 2811541Srgrimes 2821541Srgrimes case SIOCGIFADDR: 2831541Srgrimes *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 2841541Srgrimes break; 2851541Srgrimes 2861541Srgrimes case SIOCGIFBRDADDR: 2871541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) == 0) 2881541Srgrimes return (EINVAL); 2891541Srgrimes *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 2901541Srgrimes break; 2911541Srgrimes 2921541Srgrimes case SIOCGIFDSTADDR: 2931541Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 2941541Srgrimes return (EINVAL); 2951541Srgrimes *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 2961541Srgrimes break; 2971541Srgrimes 2981541Srgrimes case SIOCGIFNETMASK: 2991541Srgrimes *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 3001541Srgrimes break; 3011541Srgrimes 3021541Srgrimes case SIOCSIFDSTADDR: 3031541Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 3041541Srgrimes return (EINVAL); 3051541Srgrimes oldaddr = ia->ia_dstaddr; 3061541Srgrimes ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 3071541Srgrimes if (ifp->if_ioctl && (error = (*ifp->if_ioctl) 3081541Srgrimes (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { 3091541Srgrimes ia->ia_dstaddr = oldaddr; 3101541Srgrimes return (error); 3111541Srgrimes } 3121541Srgrimes if (ia->ia_flags & IFA_ROUTE) { 3131541Srgrimes ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 3141541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 3151541Srgrimes ia->ia_ifa.ifa_dstaddr = 3161541Srgrimes (struct sockaddr *)&ia->ia_dstaddr; 3171541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 3181541Srgrimes } 3191541Srgrimes break; 3201541Srgrimes 3211541Srgrimes case SIOCSIFBRDADDR: 3221541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) == 0) 3231541Srgrimes return (EINVAL); 3241541Srgrimes ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 3251541Srgrimes break; 3261541Srgrimes 3271541Srgrimes case SIOCSIFADDR: 3281541Srgrimes return (in_ifinit(ifp, ia, 3291541Srgrimes (struct sockaddr_in *) &ifr->ifr_addr, 1)); 3301541Srgrimes 3311541Srgrimes case SIOCSIFNETMASK: 3321541Srgrimes i = ifra->ifra_addr.sin_addr.s_addr; 3331541Srgrimes ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr = i); 3341541Srgrimes break; 3351541Srgrimes 3361541Srgrimes case SIOCAIFADDR: 3371541Srgrimes maskIsNew = 0; 3381541Srgrimes hostIsNew = 1; 3391541Srgrimes error = 0; 3401541Srgrimes if (ia->ia_addr.sin_family == AF_INET) { 3411541Srgrimes if (ifra->ifra_addr.sin_len == 0) { 3421541Srgrimes ifra->ifra_addr = ia->ia_addr; 3431541Srgrimes hostIsNew = 0; 3441541Srgrimes } else if (ifra->ifra_addr.sin_addr.s_addr == 3451541Srgrimes ia->ia_addr.sin_addr.s_addr) 3461541Srgrimes hostIsNew = 0; 3471541Srgrimes } 3481541Srgrimes if (ifra->ifra_mask.sin_len) { 3491541Srgrimes in_ifscrub(ifp, ia); 3501541Srgrimes ia->ia_sockmask = ifra->ifra_mask; 3511541Srgrimes ia->ia_subnetmask = 3521541Srgrimes ntohl(ia->ia_sockmask.sin_addr.s_addr); 3531541Srgrimes maskIsNew = 1; 3541541Srgrimes } 3551541Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) && 3561541Srgrimes (ifra->ifra_dstaddr.sin_family == AF_INET)) { 3571541Srgrimes in_ifscrub(ifp, ia); 3581541Srgrimes ia->ia_dstaddr = ifra->ifra_dstaddr; 3591541Srgrimes maskIsNew = 1; /* We lie; but the effect's the same */ 3601541Srgrimes } 3611541Srgrimes if (ifra->ifra_addr.sin_family == AF_INET && 3621541Srgrimes (hostIsNew || maskIsNew)) 3631541Srgrimes error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 3641541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) && 3651541Srgrimes (ifra->ifra_broadaddr.sin_family == AF_INET)) 3661541Srgrimes ia->ia_broadaddr = ifra->ifra_broadaddr; 3671541Srgrimes return (error); 3681541Srgrimes 3691541Srgrimes case SIOCDIFADDR: 3707280Swollman mk = malloc(sizeof *mk, M_IPMADDR, M_WAITOK); 3717280Swollman if (!mk) 3727280Swollman return ENOBUFS; 3737280Swollman 3741541Srgrimes in_ifscrub(ifp, ia); 3751541Srgrimes if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia) 3761541Srgrimes ifp->if_addrlist = ifa->ifa_next; 3771541Srgrimes else { 3781541Srgrimes while (ifa->ifa_next && 3791541Srgrimes (ifa->ifa_next != (struct ifaddr *)ia)) 3801541Srgrimes ifa = ifa->ifa_next; 3811541Srgrimes if (ifa->ifa_next) 3821541Srgrimes ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next; 3831541Srgrimes else 3841541Srgrimes printf("Couldn't unlink inifaddr from ifp\n"); 3851541Srgrimes } 3861541Srgrimes oia = ia; 3871541Srgrimes if (oia == (ia = in_ifaddr)) 3881541Srgrimes in_ifaddr = ia->ia_next; 3891541Srgrimes else { 3901541Srgrimes while (ia->ia_next && (ia->ia_next != oia)) 3911541Srgrimes ia = ia->ia_next; 3921541Srgrimes if (ia->ia_next) 3931541Srgrimes ia->ia_next = oia->ia_next; 3941541Srgrimes else 3951541Srgrimes printf("Didn't unlink inifadr from list\n"); 3961541Srgrimes } 3977280Swollman 3987280Swollman if (!oia->ia_multiaddrs.lh_first) { 3997280Swollman IFAFREE(&oia->ia_ifa); 4007280Swollman FREE(mk, M_IPMADDR); 4017280Swollman break; 4027280Swollman } 4037280Swollman 4047280Swollman /* 4057280Swollman * Multicast address kludge: 4067280Swollman * If there were any multicast addresses attached to this 4077280Swollman * interface address, either move them to another address 4087280Swollman * on this interface, or save them until such time as this 4097280Swollman * interface is reconfigured for IP. 4107280Swollman */ 4117280Swollman IFP_TO_IA(oia->ia_ifp, ia); 4127280Swollman if (ia) { /* there is another address */ 4137280Swollman struct in_multi *inm; 4148876Srgrimes for(inm = oia->ia_multiaddrs.lh_first; inm; 4157280Swollman inm = inm->inm_entry.le_next) { 4167280Swollman IFAFREE(&inm->inm_ia->ia_ifa); 4177280Swollman ia->ia_ifa.ifa_refcnt++; 4187280Swollman inm->inm_ia = ia; 4197280Swollman LIST_INSERT_HEAD(&ia->ia_multiaddrs, inm, 4207280Swollman inm_entry); 4217280Swollman } 4227280Swollman FREE(mk, M_IPMADDR); 4237280Swollman } else { /* last address on this if deleted, save */ 4247280Swollman struct in_multi *inm; 4257280Swollman 4267280Swollman LIST_INIT(&mk->mk_head); 4277280Swollman mk->mk_ifp = ifp; 4287280Swollman 4298876Srgrimes for(inm = oia->ia_multiaddrs.lh_first; inm; 4307280Swollman inm = inm->inm_entry.le_next) { 4317280Swollman LIST_INSERT_HEAD(&mk->mk_head, inm, inm_entry); 4327280Swollman } 4337280Swollman 4347280Swollman if (mk->mk_head.lh_first) { 4357280Swollman LIST_INSERT_HEAD(&in_mk, mk, mk_entry); 4367280Swollman } else { 4377280Swollman FREE(mk, M_IPMADDR); 4387280Swollman } 4397280Swollman } 4408876Srgrimes 4411541Srgrimes IFAFREE((&oia->ia_ifa)); 4421541Srgrimes break; 4431541Srgrimes 4441541Srgrimes default: 4451541Srgrimes if (ifp == 0 || ifp->if_ioctl == 0) 4461541Srgrimes return (EOPNOTSUPP); 4471541Srgrimes return ((*ifp->if_ioctl)(ifp, cmd, data)); 4481541Srgrimes } 4491541Srgrimes return (0); 4501541Srgrimes} 4511541Srgrimes 4521541Srgrimes/* 4531541Srgrimes * Delete any existing route for an interface. 4541541Srgrimes */ 4551541Srgrimesvoid 4561541Srgrimesin_ifscrub(ifp, ia) 4571541Srgrimes register struct ifnet *ifp; 4581541Srgrimes register struct in_ifaddr *ia; 4591541Srgrimes{ 4601541Srgrimes 4611541Srgrimes if ((ia->ia_flags & IFA_ROUTE) == 0) 4621541Srgrimes return; 4631541Srgrimes if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 4641541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 4651541Srgrimes else 4661541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); 4671541Srgrimes ia->ia_flags &= ~IFA_ROUTE; 4681541Srgrimes} 4691541Srgrimes 4701541Srgrimes/* 4711541Srgrimes * Initialize an interface's internet address 4721541Srgrimes * and routing table entry. 4731541Srgrimes */ 4741549Srgrimesint 4751541Srgrimesin_ifinit(ifp, ia, sin, scrub) 4761541Srgrimes register struct ifnet *ifp; 4771541Srgrimes register struct in_ifaddr *ia; 4781541Srgrimes struct sockaddr_in *sin; 4791541Srgrimes int scrub; 4801541Srgrimes{ 4811541Srgrimes register u_long i = ntohl(sin->sin_addr.s_addr); 4821541Srgrimes struct sockaddr_in oldaddr; 4832112Swollman int s = splimp(), flags = RTF_UP, error; 4847280Swollman struct multi_kludge *mk; 4851541Srgrimes 4861541Srgrimes oldaddr = ia->ia_addr; 4871541Srgrimes ia->ia_addr = *sin; 4881541Srgrimes /* 4891541Srgrimes * Give the interface a chance to initialize 4901541Srgrimes * if this is its first address, 4911541Srgrimes * and to validate the address if necessary. 4921541Srgrimes */ 4931541Srgrimes if (ifp->if_ioctl && 4941541Srgrimes (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 4951541Srgrimes splx(s); 4961541Srgrimes ia->ia_addr = oldaddr; 4971541Srgrimes return (error); 4981541Srgrimes } 4991541Srgrimes splx(s); 5001541Srgrimes if (scrub) { 5011541Srgrimes ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 5021541Srgrimes in_ifscrub(ifp, ia); 5031541Srgrimes ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 5041541Srgrimes } 5051541Srgrimes if (IN_CLASSA(i)) 5061541Srgrimes ia->ia_netmask = IN_CLASSA_NET; 5071541Srgrimes else if (IN_CLASSB(i)) 5081541Srgrimes ia->ia_netmask = IN_CLASSB_NET; 5091541Srgrimes else 5101541Srgrimes ia->ia_netmask = IN_CLASSC_NET; 5111541Srgrimes /* 5121541Srgrimes * The subnet mask usually includes at least the standard network part, 5131541Srgrimes * but may may be smaller in the case of supernetting. 5141541Srgrimes * If it is set, we believe it. 5151541Srgrimes */ 5161541Srgrimes if (ia->ia_subnetmask == 0) { 5171541Srgrimes ia->ia_subnetmask = ia->ia_netmask; 5181541Srgrimes ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 5191541Srgrimes } else 5201541Srgrimes ia->ia_netmask &= ia->ia_subnetmask; 5211541Srgrimes ia->ia_net = i & ia->ia_netmask; 5221541Srgrimes ia->ia_subnet = i & ia->ia_subnetmask; 5231541Srgrimes in_socktrim(&ia->ia_sockmask); 5241541Srgrimes /* 5251541Srgrimes * Add route for the network. 5261541Srgrimes */ 5271541Srgrimes ia->ia_ifa.ifa_metric = ifp->if_metric; 5281541Srgrimes if (ifp->if_flags & IFF_BROADCAST) { 5291541Srgrimes ia->ia_broadaddr.sin_addr.s_addr = 5301541Srgrimes htonl(ia->ia_subnet | ~ia->ia_subnetmask); 5311541Srgrimes ia->ia_netbroadcast.s_addr = 5321541Srgrimes htonl(ia->ia_net | ~ ia->ia_netmask); 5331541Srgrimes } else if (ifp->if_flags & IFF_LOOPBACK) { 5341541Srgrimes ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 5351541Srgrimes flags |= RTF_HOST; 5361541Srgrimes } else if (ifp->if_flags & IFF_POINTOPOINT) { 5371541Srgrimes if (ia->ia_dstaddr.sin_family != AF_INET) 5381541Srgrimes return (0); 5391541Srgrimes flags |= RTF_HOST; 5401541Srgrimes } 5411541Srgrimes if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0) 5421541Srgrimes ia->ia_flags |= IFA_ROUTE; 5437280Swollman 5447280Swollman LIST_INIT(&ia->ia_multiaddrs); 5451541Srgrimes /* 5461541Srgrimes * If the interface supports multicast, join the "all hosts" 5471541Srgrimes * multicast group on that interface. 5481541Srgrimes */ 5491541Srgrimes if (ifp->if_flags & IFF_MULTICAST) { 5501541Srgrimes struct in_addr addr; 5511541Srgrimes 5527280Swollman /* 5537280Swollman * Continuation of multicast address hack: 5548876Srgrimes * If there was a multicast group list previously saved 5557280Swollman * for this interface, then we re-attach it to the first 5567280Swollman * address configured on the i/f. 5577280Swollman */ 5587280Swollman for(mk = in_mk.lh_first; mk; mk = mk->mk_entry.le_next) { 5597280Swollman if(mk->mk_ifp == ifp) { 5607280Swollman struct in_multi *inm; 5618876Srgrimes 5628876Srgrimes for(inm = mk->mk_head.lh_first; inm; 5637280Swollman inm = inm->inm_entry.le_next) { 5647280Swollman IFAFREE(&inm->inm_ia->ia_ifa); 5657280Swollman ia->ia_ifa.ifa_refcnt++; 5667280Swollman inm->inm_ia = ia; 5678876Srgrimes LIST_INSERT_HEAD(&ia->ia_multiaddrs, 5687280Swollman inm, inm_entry); 5697280Swollman } 5707280Swollman LIST_REMOVE(mk, mk_entry); 5717280Swollman free(mk, M_IPMADDR); 5727280Swollman break; 5737280Swollman } 5747280Swollman } 5757280Swollman 5761541Srgrimes addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 5771541Srgrimes in_addmulti(&addr, ifp); 5781541Srgrimes } 5791541Srgrimes return (error); 5801541Srgrimes} 5811541Srgrimes 5821541Srgrimes 5831541Srgrimes/* 5841541Srgrimes * Return 1 if the address might be a local broadcast address. 5851541Srgrimes */ 5861549Srgrimesint 5871541Srgrimesin_broadcast(in, ifp) 5881541Srgrimes struct in_addr in; 5891541Srgrimes struct ifnet *ifp; 5901541Srgrimes{ 5911541Srgrimes register struct ifaddr *ifa; 5921541Srgrimes u_long t; 5931541Srgrimes 5941541Srgrimes if (in.s_addr == INADDR_BROADCAST || 5951541Srgrimes in.s_addr == INADDR_ANY) 5961541Srgrimes return 1; 5971541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) == 0) 5981541Srgrimes return 0; 5991541Srgrimes t = ntohl(in.s_addr); 6001541Srgrimes /* 6011541Srgrimes * Look through the list of addresses for a match 6021541Srgrimes * with a broadcast address. 6031541Srgrimes */ 6041541Srgrimes#define ia ((struct in_ifaddr *)ifa) 6051541Srgrimes for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 6061541Srgrimes if (ifa->ifa_addr->sa_family == AF_INET && 6071541Srgrimes (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 6081541Srgrimes in.s_addr == ia->ia_netbroadcast.s_addr || 6091541Srgrimes /* 6101541Srgrimes * Check for old-style (host 0) broadcast. 6111541Srgrimes */ 6121541Srgrimes t == ia->ia_subnet || t == ia->ia_net)) 6131541Srgrimes return 1; 6141541Srgrimes return (0); 6151541Srgrimes#undef ia 6161541Srgrimes} 6171541Srgrimes/* 6181541Srgrimes * Add an address to the list of IP multicast addresses for a given interface. 6191541Srgrimes */ 6201541Srgrimesstruct in_multi * 6211541Srgrimesin_addmulti(ap, ifp) 6221541Srgrimes register struct in_addr *ap; 6231541Srgrimes register struct ifnet *ifp; 6241541Srgrimes{ 6251541Srgrimes register struct in_multi *inm; 6261541Srgrimes struct ifreq ifr; 6271541Srgrimes struct in_ifaddr *ia; 6281541Srgrimes int s = splnet(); 6291541Srgrimes 6301541Srgrimes /* 6311541Srgrimes * See if address already in list. 6321541Srgrimes */ 6331541Srgrimes IN_LOOKUP_MULTI(*ap, ifp, inm); 6341541Srgrimes if (inm != NULL) { 6351541Srgrimes /* 6361541Srgrimes * Found it; just increment the reference count. 6371541Srgrimes */ 6381541Srgrimes ++inm->inm_refcount; 6391541Srgrimes } 6401541Srgrimes else { 6411541Srgrimes /* 6421541Srgrimes * New address; allocate a new multicast record 6431541Srgrimes * and link it into the interface's multicast list. 6441541Srgrimes */ 6451541Srgrimes inm = (struct in_multi *)malloc(sizeof(*inm), 6461541Srgrimes M_IPMADDR, M_NOWAIT); 6471541Srgrimes if (inm == NULL) { 6481541Srgrimes splx(s); 6491541Srgrimes return (NULL); 6501541Srgrimes } 6511541Srgrimes inm->inm_addr = *ap; 6521541Srgrimes inm->inm_ifp = ifp; 6531541Srgrimes inm->inm_refcount = 1; 6541541Srgrimes IFP_TO_IA(ifp, ia); 6551541Srgrimes if (ia == NULL) { 6561541Srgrimes free(inm, M_IPMADDR); 6571541Srgrimes splx(s); 6581541Srgrimes return (NULL); 6591541Srgrimes } 6601541Srgrimes inm->inm_ia = ia; 6617280Swollman ia->ia_ifa.ifa_refcnt++; /* gain a reference */ 6627280Swollman LIST_INSERT_HEAD(&ia->ia_multiaddrs, inm, inm_entry); 6637280Swollman 6641541Srgrimes /* 6651541Srgrimes * Ask the network driver to update its multicast reception 6661541Srgrimes * filter appropriately for the new address. 6671541Srgrimes */ 6681541Srgrimes ((struct sockaddr_in *)&ifr.ifr_addr)->sin_family = AF_INET; 6691541Srgrimes ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr = *ap; 6701541Srgrimes if ((ifp->if_ioctl == NULL) || 6711541Srgrimes (*ifp->if_ioctl)(ifp, SIOCADDMULTI,(caddr_t)&ifr) != 0) { 6727280Swollman LIST_REMOVE(inm, inm_entry); 6737280Swollman IFAFREE(&ia->ia_ifa); /* release reference */ 6741541Srgrimes free(inm, M_IPMADDR); 6751541Srgrimes splx(s); 6761541Srgrimes return (NULL); 6771541Srgrimes } 6781541Srgrimes /* 6791541Srgrimes * Let IGMP know that we have joined a new IP multicast group. 6801541Srgrimes */ 6811541Srgrimes igmp_joingroup(inm); 6821541Srgrimes } 6831541Srgrimes splx(s); 6841541Srgrimes return (inm); 6851541Srgrimes} 6861541Srgrimes 6871541Srgrimes/* 6881541Srgrimes * Delete a multicast address record. 6891541Srgrimes */ 6901549Srgrimesvoid 6911541Srgrimesin_delmulti(inm) 6921541Srgrimes register struct in_multi *inm; 6931541Srgrimes{ 6941541Srgrimes register struct in_multi **p; 6951541Srgrimes struct ifreq ifr; 6961541Srgrimes int s = splnet(); 6971541Srgrimes 6981541Srgrimes if (--inm->inm_refcount == 0) { 6991541Srgrimes /* 7001541Srgrimes * No remaining claims to this record; let IGMP know that 7011541Srgrimes * we are leaving the multicast group. 7021541Srgrimes */ 7031541Srgrimes igmp_leavegroup(inm); 7041541Srgrimes /* 7051541Srgrimes * Unlink from list. 7061541Srgrimes */ 7077280Swollman LIST_REMOVE(inm, inm_entry); 7087280Swollman IFAFREE(&inm->inm_ia->ia_ifa); /* release reference */ 7097280Swollman 7101541Srgrimes /* 7111541Srgrimes * Notify the network driver to update its multicast reception 7121541Srgrimes * filter. 7131541Srgrimes */ 7141541Srgrimes ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET; 7151541Srgrimes ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr = 7161541Srgrimes inm->inm_addr; 7171541Srgrimes (*inm->inm_ifp->if_ioctl)(inm->inm_ifp, SIOCDELMULTI, 7181541Srgrimes (caddr_t)&ifr); 7191541Srgrimes free(inm, M_IPMADDR); 7201541Srgrimes } 7211541Srgrimes splx(s); 7221541Srgrimes} 723