in.c revision 139823
1139823Simp/*- 21541Srgrimes * Copyright (c) 1982, 1986, 1991, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 4137668Smlaier * Copyright (C) 2001 WIDE Project. All rights reserved. 51541Srgrimes * 61541Srgrimes * Redistribution and use in source and binary forms, with or without 71541Srgrimes * modification, are permitted provided that the following conditions 81541Srgrimes * are met: 91541Srgrimes * 1. Redistributions of source code must retain the above copyright 101541Srgrimes * notice, this list of conditions and the following disclaimer. 111541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 121541Srgrimes * notice, this list of conditions and the following disclaimer in the 131541Srgrimes * documentation and/or other materials provided with the distribution. 141541Srgrimes * 4. Neither the name of the University nor the names of its contributors 151541Srgrimes * may be used to endorse or promote products derived from this software 161541Srgrimes * without specific prior written permission. 171541Srgrimes * 181541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 191541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 201541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 211541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 221541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 231541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 241541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 251541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 261541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 271541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 281541Srgrimes * SUCH DAMAGE. 291541Srgrimes * 3010939Swollman * @(#)in.c 8.4 (Berkeley) 1/9/95 3150477Speter * $FreeBSD: head/sys/netinet/in.c 139823 2005-01-07 01:45:51Z imp $ 321541Srgrimes */ 331541Srgrimes 341541Srgrimes#include <sys/param.h> 351549Srgrimes#include <sys/systm.h> 3624204Sbde#include <sys/sockio.h> 371541Srgrimes#include <sys/malloc.h> 381541Srgrimes#include <sys/socket.h> 3912704Sphk#include <sys/kernel.h> 4012704Sphk#include <sys/sysctl.h> 411541Srgrimes 421541Srgrimes#include <net/if.h> 4355009Sshin#include <net/if_types.h> 441541Srgrimes#include <net/route.h> 451541Srgrimes 461541Srgrimes#include <netinet/in.h> 471541Srgrimes#include <netinet/in_var.h> 4881127Sume#include <netinet/in_pcb.h> 491541Srgrimes 506363Sphk#include <netinet/igmp_var.h> 516363Sphk 5230354Sphkstatic MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 5330309Sphk 5492723Salfredstatic int in_mask2len(struct in_addr *); 5592723Salfredstatic void in_len2mask(struct in_addr *, int); 5692723Salfredstatic int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 5792723Salfred struct ifnet *, struct thread *); 5855009Sshin 59137628Smlaierstatic int in_addprefix(struct in_ifaddr *, int); 60137628Smlaierstatic int in_scrubprefix(struct in_ifaddr *); 6192723Salfredstatic void in_socktrim(struct sockaddr_in *); 6292723Salfredstatic int in_ifinit(struct ifnet *, 6392723Salfred struct in_ifaddr *, struct sockaddr_in *, int); 641541Srgrimes 6518193Swollmanstatic int subnetsarelocal = 0; 66133874SrwatsonSYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 67123998Sru &subnetsarelocal, 0, "Treat all subnets as directly connected"); 6821666Swollman 6921666Swollmanstruct in_multihead in_multihead; /* XXX BSS initialization */ 7021666Swollman 7181127Sumeextern struct inpcbinfo ripcbinfo; 7281127Sumeextern struct inpcbinfo udbinfo; 7381127Sume 741541Srgrimes/* 751541Srgrimes * Return 1 if an internet address is for a ``local'' host 761541Srgrimes * (one to which we have a connection). If subnetsarelocal 771541Srgrimes * is true, this includes other subnets of the local net. 781541Srgrimes * Otherwise, it includes only the directly-connected (sub)nets. 791541Srgrimes */ 801549Srgrimesint 811541Srgrimesin_localaddr(in) 821541Srgrimes struct in_addr in; 831541Srgrimes{ 841541Srgrimes register u_long i = ntohl(in.s_addr); 851541Srgrimes register struct in_ifaddr *ia; 861541Srgrimes 871541Srgrimes if (subnetsarelocal) { 8874362Sphk TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 891541Srgrimes if ((i & ia->ia_netmask) == ia->ia_net) 901541Srgrimes return (1); 911541Srgrimes } else { 9272012Sphk TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 931541Srgrimes if ((i & ia->ia_subnetmask) == ia->ia_subnet) 941541Srgrimes return (1); 951541Srgrimes } 961541Srgrimes return (0); 971541Srgrimes} 981541Srgrimes 991541Srgrimes/* 100133486Sandre * Return 1 if an internet address is for the local host and configured 101133486Sandre * on one of its interfaces. 102133486Sandre */ 103133486Sandreint 104133486Sandrein_localip(in) 105133486Sandre struct in_addr in; 106133486Sandre{ 107133486Sandre struct in_ifaddr *ia; 108133486Sandre 109133486Sandre LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 110133486Sandre if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) 111133486Sandre return 1; 112133486Sandre } 113133486Sandre return 0; 114133486Sandre} 115133486Sandre 116133486Sandre/* 1171541Srgrimes * Determine whether an IP address is in a reserved set of addresses 1181541Srgrimes * that may not be forwarded, or whether datagrams to that destination 1191541Srgrimes * may be forwarded. 1201541Srgrimes */ 1211549Srgrimesint 1221541Srgrimesin_canforward(in) 1231541Srgrimes struct in_addr in; 1241541Srgrimes{ 1251541Srgrimes register u_long i = ntohl(in.s_addr); 1261541Srgrimes register u_long net; 1271541Srgrimes 1281541Srgrimes if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 1291541Srgrimes return (0); 1301541Srgrimes if (IN_CLASSA(i)) { 1311541Srgrimes net = i & IN_CLASSA_NET; 1321541Srgrimes if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 1331541Srgrimes return (0); 1341541Srgrimes } 1351541Srgrimes return (1); 1361541Srgrimes} 1371541Srgrimes 1381541Srgrimes/* 1391541Srgrimes * Trim a mask in a sockaddr 1401541Srgrimes */ 14112296Sphkstatic void 1421541Srgrimesin_socktrim(ap) 1431541Srgrimesstruct sockaddr_in *ap; 1441541Srgrimes{ 1451541Srgrimes register char *cplim = (char *) &ap->sin_addr; 1461541Srgrimes register char *cp = (char *) (&ap->sin_addr + 1); 1471541Srgrimes 1481541Srgrimes ap->sin_len = 0; 1494127Swollman while (--cp >= cplim) 150133874Srwatson if (*cp) { 1511541Srgrimes (ap)->sin_len = cp - (char *) (ap) + 1; 1521541Srgrimes break; 1531541Srgrimes } 1541541Srgrimes} 1551541Srgrimes 15655009Sshinstatic int 15755009Sshinin_mask2len(mask) 15855009Sshin struct in_addr *mask; 15955009Sshin{ 16055009Sshin int x, y; 16155009Sshin u_char *p; 16255009Sshin 16355009Sshin p = (u_char *)mask; 16455009Sshin for (x = 0; x < sizeof(*mask); x++) { 16555009Sshin if (p[x] != 0xff) 16655009Sshin break; 16755009Sshin } 16855009Sshin y = 0; 16955009Sshin if (x < sizeof(*mask)) { 17055009Sshin for (y = 0; y < 8; y++) { 17155009Sshin if ((p[x] & (0x80 >> y)) == 0) 17255009Sshin break; 17355009Sshin } 17455009Sshin } 17555009Sshin return x * 8 + y; 17655009Sshin} 17755009Sshin 17855009Sshinstatic void 17955009Sshinin_len2mask(mask, len) 18055009Sshin struct in_addr *mask; 18155009Sshin int len; 18255009Sshin{ 18355009Sshin int i; 18455009Sshin u_char *p; 18555009Sshin 18655009Sshin p = (u_char *)mask; 18755009Sshin bzero(mask, sizeof(*mask)); 18855009Sshin for (i = 0; i < len / 8; i++) 18955009Sshin p[i] = 0xff; 19055009Sshin if (len % 8) 19155009Sshin p[i] = (0xff00 >> (len % 8)) & 0xff; 19255009Sshin} 19355009Sshin 1941541Srgrimes/* 1951541Srgrimes * Generic internet control operations (ioctl's). 1961541Srgrimes * Ifp is 0 if not an interface-specific ioctl. 1971541Srgrimes */ 1981541Srgrimes/* ARGSUSED */ 1991549Srgrimesint 20083366Sjulianin_control(so, cmd, data, ifp, td) 2011541Srgrimes struct socket *so; 20236735Sdfr u_long cmd; 2031541Srgrimes caddr_t data; 2041541Srgrimes register struct ifnet *ifp; 20583366Sjulian struct thread *td; 2061541Srgrimes{ 2071541Srgrimes register struct ifreq *ifr = (struct ifreq *)data; 20814632Sfenner register struct in_ifaddr *ia = 0, *iap; 2091541Srgrimes register struct ifaddr *ifa; 21084102Sjlemon struct in_addr dst; 2111541Srgrimes struct in_ifaddr *oia; 2121541Srgrimes struct in_aliasreq *ifra = (struct in_aliasreq *)data; 2131541Srgrimes struct sockaddr_in oldaddr; 21487124Sbrian int error, hostIsNew, iaIsNew, maskIsNew, s; 2151541Srgrimes 21687124Sbrian iaIsNew = 0; 21787124Sbrian 21855009Sshin switch (cmd) { 21955009Sshin case SIOCALIFADDR: 22055009Sshin case SIOCDLIFADDR: 22193593Sjhb if (td && (error = suser(td)) != 0) 22255009Sshin return error; 22355009Sshin /*fall through*/ 22455009Sshin case SIOCGLIFADDR: 22555009Sshin if (!ifp) 22655009Sshin return EINVAL; 22783366Sjulian return in_lifaddr_ioctl(so, cmd, data, ifp, td); 22855009Sshin } 22955009Sshin 2301541Srgrimes /* 2311541Srgrimes * Find address for this interface, if it exists. 23214632Sfenner * 23314632Sfenner * If an alias address was specified, find that one instead of 23484102Sjlemon * the first one on the interface, if possible. 2351541Srgrimes */ 23684102Sjlemon if (ifp) { 23784102Sjlemon dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 23884102Sjlemon LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 23984102Sjlemon if (iap->ia_ifp == ifp && 24084102Sjlemon iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 24184102Sjlemon ia = iap; 24284102Sjlemon break; 24384102Sjlemon } 24484102Sjlemon if (ia == NULL) 24584102Sjlemon TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 24684102Sjlemon iap = ifatoia(ifa); 24784102Sjlemon if (iap->ia_addr.sin_family == AF_INET) { 24814632Sfenner ia = iap; 24914632Sfenner break; 25014632Sfenner } 25114632Sfenner } 25284102Sjlemon } 2531541Srgrimes 2541541Srgrimes switch (cmd) { 2551541Srgrimes 2561541Srgrimes case SIOCAIFADDR: 2571541Srgrimes case SIOCDIFADDR: 25841575Seivind if (ifp == 0) 25941575Seivind return (EADDRNOTAVAIL); 2608071Swollman if (ifra->ifra_addr.sin_family == AF_INET) { 26171999Sphk for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 2628071Swollman if (ia->ia_ifp == ifp && 2638071Swollman ia->ia_addr.sin_addr.s_addr == 2648071Swollman ifra->ifra_addr.sin_addr.s_addr) 2658071Swollman break; 2668071Swollman } 2678876Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) 2688071Swollman && (cmd == SIOCAIFADDR) 2698071Swollman && (ifra->ifra_dstaddr.sin_addr.s_addr 2708071Swollman == INADDR_ANY)) { 2719563Swollman return EDESTADDRREQ; 2728071Swollman } 2731541Srgrimes } 2741541Srgrimes if (cmd == SIOCDIFADDR && ia == 0) 2751541Srgrimes return (EADDRNOTAVAIL); 2761541Srgrimes /* FALLTHROUGH */ 2771541Srgrimes case SIOCSIFADDR: 2781541Srgrimes case SIOCSIFNETMASK: 2791541Srgrimes case SIOCSIFDSTADDR: 28093593Sjhb if (td && (error = suser(td)) != 0) 28125201Swollman return error; 2821541Srgrimes 2831541Srgrimes if (ifp == 0) 28441575Seivind return (EADDRNOTAVAIL); 2851541Srgrimes if (ia == (struct in_ifaddr *)0) { 28620407Swollman ia = (struct in_ifaddr *) 287111119Simp malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO); 28820407Swollman if (ia == (struct in_ifaddr *)NULL) 2891541Srgrimes return (ENOBUFS); 29015092Sdg /* 29115092Sdg * Protect from ipintr() traversing address list 29215092Sdg * while we're modifying it. 29315092Sdg */ 29415092Sdg s = splnet(); 29520407Swollman TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 296108033Shsu 29720407Swollman ifa = &ia->ia_ifa; 298108033Shsu IFA_LOCK_INIT(ifa); 29920407Swollman ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 30020407Swollman ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 30120407Swollman ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 302108033Shsu ifa->ifa_refcnt = 1; 303108033Shsu TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 304108033Shsu 3051541Srgrimes ia->ia_sockmask.sin_len = 8; 30685740Sdes ia->ia_sockmask.sin_family = AF_INET; 3071541Srgrimes if (ifp->if_flags & IFF_BROADCAST) { 3081541Srgrimes ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 3091541Srgrimes ia->ia_broadaddr.sin_family = AF_INET; 3101541Srgrimes } 3111541Srgrimes ia->ia_ifp = ifp; 31215092Sdg splx(s); 31387124Sbrian iaIsNew = 1; 3141541Srgrimes } 3151541Srgrimes break; 3161541Srgrimes 3171541Srgrimes case SIOCSIFBRDADDR: 31893593Sjhb if (td && (error = suser(td)) != 0) 31925201Swollman return error; 3201541Srgrimes /* FALLTHROUGH */ 3211541Srgrimes 3221541Srgrimes case SIOCGIFADDR: 3231541Srgrimes case SIOCGIFNETMASK: 3241541Srgrimes case SIOCGIFDSTADDR: 3251541Srgrimes case SIOCGIFBRDADDR: 3261541Srgrimes if (ia == (struct in_ifaddr *)0) 3271541Srgrimes return (EADDRNOTAVAIL); 3281541Srgrimes break; 3291541Srgrimes } 3301541Srgrimes switch (cmd) { 3311541Srgrimes 3321541Srgrimes case SIOCGIFADDR: 3331541Srgrimes *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 33487124Sbrian return (0); 3351541Srgrimes 3361541Srgrimes case SIOCGIFBRDADDR: 3371541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) == 0) 3381541Srgrimes return (EINVAL); 3391541Srgrimes *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 34087124Sbrian return (0); 3411541Srgrimes 3421541Srgrimes case SIOCGIFDSTADDR: 3431541Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 3441541Srgrimes return (EINVAL); 3451541Srgrimes *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 34687124Sbrian return (0); 3471541Srgrimes 3481541Srgrimes case SIOCGIFNETMASK: 3491541Srgrimes *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 35087124Sbrian return (0); 3511541Srgrimes 3521541Srgrimes case SIOCSIFDSTADDR: 3531541Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 3541541Srgrimes return (EINVAL); 3551541Srgrimes oldaddr = ia->ia_dstaddr; 3561541Srgrimes ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 3571541Srgrimes if (ifp->if_ioctl && (error = (*ifp->if_ioctl) 3581541Srgrimes (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) { 3591541Srgrimes ia->ia_dstaddr = oldaddr; 3601541Srgrimes return (error); 3611541Srgrimes } 3621541Srgrimes if (ia->ia_flags & IFA_ROUTE) { 3631541Srgrimes ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 3641541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 3651541Srgrimes ia->ia_ifa.ifa_dstaddr = 3661541Srgrimes (struct sockaddr *)&ia->ia_dstaddr; 3671541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 3681541Srgrimes } 36987124Sbrian return (0); 3701541Srgrimes 3711541Srgrimes case SIOCSIFBRDADDR: 3721541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) == 0) 3731541Srgrimes return (EINVAL); 3741541Srgrimes ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 37587124Sbrian return (0); 3761541Srgrimes 3771541Srgrimes case SIOCSIFADDR: 37887124Sbrian error = in_ifinit(ifp, ia, 37987124Sbrian (struct sockaddr_in *) &ifr->ifr_addr, 1); 38087124Sbrian if (error != 0 && iaIsNew) 38187124Sbrian break; 382126264Smlaier if (error == 0) 383126264Smlaier EVENTHANDLER_INVOKE(ifaddr_event, ifp); 38487124Sbrian return (0); 3851541Srgrimes 3861541Srgrimes case SIOCSIFNETMASK: 38785740Sdes ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 38885740Sdes ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 38987124Sbrian return (0); 3901541Srgrimes 3911541Srgrimes case SIOCAIFADDR: 3921541Srgrimes maskIsNew = 0; 3931541Srgrimes hostIsNew = 1; 3941541Srgrimes error = 0; 3951541Srgrimes if (ia->ia_addr.sin_family == AF_INET) { 3961541Srgrimes if (ifra->ifra_addr.sin_len == 0) { 3971541Srgrimes ifra->ifra_addr = ia->ia_addr; 3981541Srgrimes hostIsNew = 0; 3991541Srgrimes } else if (ifra->ifra_addr.sin_addr.s_addr == 4001541Srgrimes ia->ia_addr.sin_addr.s_addr) 4011541Srgrimes hostIsNew = 0; 4021541Srgrimes } 4031541Srgrimes if (ifra->ifra_mask.sin_len) { 4041541Srgrimes in_ifscrub(ifp, ia); 4051541Srgrimes ia->ia_sockmask = ifra->ifra_mask; 40685740Sdes ia->ia_sockmask.sin_family = AF_INET; 4071541Srgrimes ia->ia_subnetmask = 4081541Srgrimes ntohl(ia->ia_sockmask.sin_addr.s_addr); 4091541Srgrimes maskIsNew = 1; 4101541Srgrimes } 4111541Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) && 4121541Srgrimes (ifra->ifra_dstaddr.sin_family == AF_INET)) { 4131541Srgrimes in_ifscrub(ifp, ia); 4141541Srgrimes ia->ia_dstaddr = ifra->ifra_dstaddr; 4151541Srgrimes maskIsNew = 1; /* We lie; but the effect's the same */ 4161541Srgrimes } 4171541Srgrimes if (ifra->ifra_addr.sin_family == AF_INET && 4181541Srgrimes (hostIsNew || maskIsNew)) 4191541Srgrimes error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 42087124Sbrian if (error != 0 && iaIsNew) 42187124Sbrian break; 42287124Sbrian 4231541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) && 4241541Srgrimes (ifra->ifra_broadaddr.sin_family == AF_INET)) 4251541Srgrimes ia->ia_broadaddr = ifra->ifra_broadaddr; 426126264Smlaier if (error == 0) 427126264Smlaier EVENTHANDLER_INVOKE(ifaddr_event, ifp); 4281541Srgrimes return (error); 4291541Srgrimes 4301541Srgrimes case SIOCDIFADDR: 43174299Sru /* 43274299Sru * in_ifscrub kills the interface route. 43374299Sru */ 4341541Srgrimes in_ifscrub(ifp, ia); 43515092Sdg /* 43674299Sru * in_ifadown gets rid of all the rest of 43774299Sru * the routes. This is not quite the right 43874299Sru * thing to do, but at least if we are running 43974299Sru * a routing process they will come back. 44074299Sru */ 44176469Sru in_ifadown(&ia->ia_ifa, 1); 44281127Sume /* 44381127Sume * XXX horrible hack to detect that we are being called 44481127Sume * from if_detach() 44581127Sume */ 446121922Ssam if (ifaddr_byindex(ifp->if_index) == NULL) { 44798102Shsu in_pcbpurgeif0(&ripcbinfo, ifp); 44898102Shsu in_pcbpurgeif0(&udbinfo, ifp); 44981127Sume } 450126264Smlaier EVENTHANDLER_INVOKE(ifaddr_event, ifp); 45187124Sbrian error = 0; 4521541Srgrimes break; 4531541Srgrimes 4541541Srgrimes default: 4551541Srgrimes if (ifp == 0 || ifp->if_ioctl == 0) 4561541Srgrimes return (EOPNOTSUPP); 4571541Srgrimes return ((*ifp->if_ioctl)(ifp, cmd, data)); 4581541Srgrimes } 45987124Sbrian 46087124Sbrian /* 46187124Sbrian * Protect from ipintr() traversing address list while we're modifying 46287124Sbrian * it. 46387124Sbrian */ 46487124Sbrian s = splnet(); 46587124Sbrian TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 46687124Sbrian TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 46787124Sbrian LIST_REMOVE(ia, ia_hash); 46887124Sbrian IFAFREE(&ia->ia_ifa); 46987124Sbrian splx(s); 47087124Sbrian 47187124Sbrian return (error); 4721541Srgrimes} 4731541Srgrimes 4741541Srgrimes/* 47555009Sshin * SIOC[GAD]LIFADDR. 47655009Sshin * SIOCGLIFADDR: get first address. (?!?) 47755009Sshin * SIOCGLIFADDR with IFLR_PREFIX: 47855009Sshin * get first address that matches the specified prefix. 47955009Sshin * SIOCALIFADDR: add the specified address. 48055009Sshin * SIOCALIFADDR with IFLR_PREFIX: 48155009Sshin * EINVAL since we can't deduce hostid part of the address. 48255009Sshin * SIOCDLIFADDR: delete the specified address. 48355009Sshin * SIOCDLIFADDR with IFLR_PREFIX: 48455009Sshin * delete the first address that matches the specified prefix. 48555009Sshin * return values: 48655009Sshin * EINVAL on invalid parameters 48755009Sshin * EADDRNOTAVAIL on prefix match failed/specified address not found 48855009Sshin * other values may be returned from in_ioctl() 48955009Sshin */ 49055009Sshinstatic int 49183366Sjulianin_lifaddr_ioctl(so, cmd, data, ifp, td) 49255009Sshin struct socket *so; 49355009Sshin u_long cmd; 49455009Sshin caddr_t data; 49555009Sshin struct ifnet *ifp; 49683366Sjulian struct thread *td; 49755009Sshin{ 49855009Sshin struct if_laddrreq *iflr = (struct if_laddrreq *)data; 49955009Sshin struct ifaddr *ifa; 50055009Sshin 50155009Sshin /* sanity checks */ 50255009Sshin if (!data || !ifp) { 50355009Sshin panic("invalid argument to in_lifaddr_ioctl"); 50455009Sshin /*NOTRECHED*/ 50555009Sshin } 50655009Sshin 50755009Sshin switch (cmd) { 50855009Sshin case SIOCGLIFADDR: 50955009Sshin /* address must be specified on GET with IFLR_PREFIX */ 51055009Sshin if ((iflr->flags & IFLR_PREFIX) == 0) 51155009Sshin break; 51255009Sshin /*FALLTHROUGH*/ 51355009Sshin case SIOCALIFADDR: 51455009Sshin case SIOCDLIFADDR: 51555009Sshin /* address must be specified on ADD and DELETE */ 51655917Sshin if (iflr->addr.ss_family != AF_INET) 51755009Sshin return EINVAL; 51855917Sshin if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 51955009Sshin return EINVAL; 52055009Sshin /* XXX need improvement */ 52155917Sshin if (iflr->dstaddr.ss_family 52255917Sshin && iflr->dstaddr.ss_family != AF_INET) 52355009Sshin return EINVAL; 52455917Sshin if (iflr->dstaddr.ss_family 52555917Sshin && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 52655009Sshin return EINVAL; 52755009Sshin break; 52855009Sshin default: /*shouldn't happen*/ 52955009Sshin return EOPNOTSUPP; 53055009Sshin } 53155009Sshin if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 53255009Sshin return EINVAL; 53355009Sshin 53455009Sshin switch (cmd) { 53555009Sshin case SIOCALIFADDR: 53655009Sshin { 53755009Sshin struct in_aliasreq ifra; 53855009Sshin 53955009Sshin if (iflr->flags & IFLR_PREFIX) 54055009Sshin return EINVAL; 54155009Sshin 54255009Sshin /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 54355009Sshin bzero(&ifra, sizeof(ifra)); 54455009Sshin bcopy(iflr->iflr_name, ifra.ifra_name, 54555009Sshin sizeof(ifra.ifra_name)); 54655009Sshin 54755917Sshin bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 54855009Sshin 54955917Sshin if (iflr->dstaddr.ss_family) { /*XXX*/ 55055009Sshin bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 55155917Sshin iflr->dstaddr.ss_len); 55255009Sshin } 55355009Sshin 55455009Sshin ifra.ifra_mask.sin_family = AF_INET; 55555009Sshin ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 55655009Sshin in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 55755009Sshin 55883366Sjulian return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 55955009Sshin } 56055009Sshin case SIOCGLIFADDR: 56155009Sshin case SIOCDLIFADDR: 56255009Sshin { 56355009Sshin struct in_ifaddr *ia; 56455009Sshin struct in_addr mask, candidate, match; 56555009Sshin struct sockaddr_in *sin; 56655009Sshin int cmp; 56755009Sshin 56855009Sshin bzero(&mask, sizeof(mask)); 56955009Sshin if (iflr->flags & IFLR_PREFIX) { 57055009Sshin /* lookup a prefix rather than address. */ 57155009Sshin in_len2mask(&mask, iflr->prefixlen); 57255009Sshin 57355009Sshin sin = (struct sockaddr_in *)&iflr->addr; 57455009Sshin match.s_addr = sin->sin_addr.s_addr; 57555009Sshin match.s_addr &= mask.s_addr; 57655009Sshin 57755009Sshin /* if you set extra bits, that's wrong */ 57855009Sshin if (match.s_addr != sin->sin_addr.s_addr) 57955009Sshin return EINVAL; 58055009Sshin 58155009Sshin cmp = 1; 58255009Sshin } else { 58355009Sshin if (cmd == SIOCGLIFADDR) { 58455009Sshin /* on getting an address, take the 1st match */ 58555009Sshin cmp = 0; /*XXX*/ 58655009Sshin } else { 58755009Sshin /* on deleting an address, do exact match */ 58855009Sshin in_len2mask(&mask, 32); 58955009Sshin sin = (struct sockaddr_in *)&iflr->addr; 59055009Sshin match.s_addr = sin->sin_addr.s_addr; 59155009Sshin 59255009Sshin cmp = 1; 59355009Sshin } 59455009Sshin } 59555009Sshin 59655009Sshin TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 59755009Sshin if (ifa->ifa_addr->sa_family != AF_INET6) 59855009Sshin continue; 59955009Sshin if (!cmp) 60055009Sshin break; 60155009Sshin candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 60255009Sshin candidate.s_addr &= mask.s_addr; 60355009Sshin if (candidate.s_addr == match.s_addr) 60455009Sshin break; 60555009Sshin } 60655009Sshin if (!ifa) 60755009Sshin return EADDRNOTAVAIL; 60855009Sshin ia = (struct in_ifaddr *)ifa; 60955009Sshin 61055009Sshin if (cmd == SIOCGLIFADDR) { 61155009Sshin /* fill in the if_laddrreq structure */ 61255009Sshin bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 61355009Sshin 61455009Sshin if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 61555009Sshin bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 61655009Sshin ia->ia_dstaddr.sin_len); 61755009Sshin } else 61855009Sshin bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 61955009Sshin 62055009Sshin iflr->prefixlen = 62155009Sshin in_mask2len(&ia->ia_sockmask.sin_addr); 62255009Sshin 62355009Sshin iflr->flags = 0; /*XXX*/ 62455009Sshin 62555009Sshin return 0; 62655009Sshin } else { 62755009Sshin struct in_aliasreq ifra; 62855009Sshin 62955009Sshin /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 63055009Sshin bzero(&ifra, sizeof(ifra)); 63155009Sshin bcopy(iflr->iflr_name, ifra.ifra_name, 63255009Sshin sizeof(ifra.ifra_name)); 63355009Sshin 63455009Sshin bcopy(&ia->ia_addr, &ifra.ifra_addr, 63555009Sshin ia->ia_addr.sin_len); 63655009Sshin if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 63755009Sshin bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 63855009Sshin ia->ia_dstaddr.sin_len); 63955009Sshin } 64055009Sshin bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 64155009Sshin ia->ia_sockmask.sin_len); 64255009Sshin 64355009Sshin return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 64483366Sjulian ifp, td); 64555009Sshin } 64655009Sshin } 64755009Sshin } 64855009Sshin 64955009Sshin return EOPNOTSUPP; /*just for safety*/ 65055009Sshin} 65155009Sshin 65255009Sshin/* 6531541Srgrimes * Delete any existing route for an interface. 6541541Srgrimes */ 65522672Swollmanvoid 6561541Srgrimesin_ifscrub(ifp, ia) 6571541Srgrimes register struct ifnet *ifp; 6581541Srgrimes register struct in_ifaddr *ia; 6591541Srgrimes{ 660137628Smlaier in_scrubprefix(ia); 6611541Srgrimes} 6621541Srgrimes 6631541Srgrimes/* 6641541Srgrimes * Initialize an interface's internet address 6651541Srgrimes * and routing table entry. 6661541Srgrimes */ 66712296Sphkstatic int 6681541Srgrimesin_ifinit(ifp, ia, sin, scrub) 6691541Srgrimes register struct ifnet *ifp; 6701541Srgrimes register struct in_ifaddr *ia; 6711541Srgrimes struct sockaddr_in *sin; 6721541Srgrimes int scrub; 6731541Srgrimes{ 6741541Srgrimes register u_long i = ntohl(sin->sin_addr.s_addr); 6751541Srgrimes struct sockaddr_in oldaddr; 67694326Sbrian int s = splimp(), flags = RTF_UP, error = 0; 6771541Srgrimes 6781541Srgrimes oldaddr = ia->ia_addr; 679105748Ssuz if (oldaddr.sin_family == AF_INET) 680105748Ssuz LIST_REMOVE(ia, ia_hash); 6811541Srgrimes ia->ia_addr = *sin; 682105748Ssuz if (ia->ia_addr.sin_family == AF_INET) 683105748Ssuz LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 684105748Ssuz ia, ia_hash); 6851541Srgrimes /* 6861541Srgrimes * Give the interface a chance to initialize 6871541Srgrimes * if this is its first address, 6881541Srgrimes * and to validate the address if necessary. 6891541Srgrimes */ 6901541Srgrimes if (ifp->if_ioctl && 6911541Srgrimes (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 6921541Srgrimes splx(s); 693105748Ssuz /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 6941541Srgrimes ia->ia_addr = oldaddr; 695105748Ssuz if (ia->ia_addr.sin_family == AF_INET) 696105748Ssuz LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 697105748Ssuz ia, ia_hash); 6981541Srgrimes return (error); 6991541Srgrimes } 7001541Srgrimes splx(s); 7011541Srgrimes if (scrub) { 7021541Srgrimes ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 7031541Srgrimes in_ifscrub(ifp, ia); 7041541Srgrimes ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 7051541Srgrimes } 7061541Srgrimes if (IN_CLASSA(i)) 7071541Srgrimes ia->ia_netmask = IN_CLASSA_NET; 7081541Srgrimes else if (IN_CLASSB(i)) 7091541Srgrimes ia->ia_netmask = IN_CLASSB_NET; 7101541Srgrimes else 7111541Srgrimes ia->ia_netmask = IN_CLASSC_NET; 7121541Srgrimes /* 7131541Srgrimes * The subnet mask usually includes at least the standard network part, 7141541Srgrimes * but may may be smaller in the case of supernetting. 7151541Srgrimes * If it is set, we believe it. 7161541Srgrimes */ 7171541Srgrimes if (ia->ia_subnetmask == 0) { 7181541Srgrimes ia->ia_subnetmask = ia->ia_netmask; 7191541Srgrimes ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 7201541Srgrimes } else 7211541Srgrimes ia->ia_netmask &= ia->ia_subnetmask; 7221541Srgrimes ia->ia_net = i & ia->ia_netmask; 7231541Srgrimes ia->ia_subnet = i & ia->ia_subnetmask; 7241541Srgrimes in_socktrim(&ia->ia_sockmask); 7251541Srgrimes /* 7261541Srgrimes * Add route for the network. 7271541Srgrimes */ 7281541Srgrimes ia->ia_ifa.ifa_metric = ifp->if_metric; 7291541Srgrimes if (ifp->if_flags & IFF_BROADCAST) { 7301541Srgrimes ia->ia_broadaddr.sin_addr.s_addr = 7311541Srgrimes htonl(ia->ia_subnet | ~ia->ia_subnetmask); 7321541Srgrimes ia->ia_netbroadcast.s_addr = 7331541Srgrimes htonl(ia->ia_net | ~ ia->ia_netmask); 7341541Srgrimes } else if (ifp->if_flags & IFF_LOOPBACK) { 735137833Smlaier ia->ia_dstaddr = ia->ia_addr; 7361541Srgrimes flags |= RTF_HOST; 7371541Srgrimes } else if (ifp->if_flags & IFF_POINTOPOINT) { 7381541Srgrimes if (ia->ia_dstaddr.sin_family != AF_INET) 7391541Srgrimes return (0); 7401541Srgrimes flags |= RTF_HOST; 7411541Srgrimes } 742137628Smlaier if ((error = in_addprefix(ia, flags)) != 0) 743137628Smlaier return (error); 74494326Sbrian 7451541Srgrimes /* 7461541Srgrimes * If the interface supports multicast, join the "all hosts" 7471541Srgrimes * multicast group on that interface. 7481541Srgrimes */ 7491541Srgrimes if (ifp->if_flags & IFF_MULTICAST) { 7501541Srgrimes struct in_addr addr; 7511541Srgrimes 7521541Srgrimes addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 7531541Srgrimes in_addmulti(&addr, ifp); 7541541Srgrimes } 7551541Srgrimes return (error); 7561541Srgrimes} 7571541Srgrimes 758137628Smlaier#define rtinitflags(x) \ 759137628Smlaier ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 760137628Smlaier ? RTF_HOST : 0) 761137628Smlaier/* 762137628Smlaier * Check if we have a route for the given prefix already or add a one 763137628Smlaier * accordingly. 764137628Smlaier */ 765137628Smlaierstatic int 766137628Smlaierin_addprefix(target, flags) 767137628Smlaier struct in_ifaddr *target; 768137628Smlaier int flags; 769137628Smlaier{ 770137628Smlaier struct in_ifaddr *ia; 771137628Smlaier struct in_addr prefix, mask, p; 772137628Smlaier int error; 7731541Srgrimes 774137628Smlaier if ((flags & RTF_HOST) != 0) 775137628Smlaier prefix = target->ia_dstaddr.sin_addr; 776137628Smlaier else { 777137628Smlaier prefix = target->ia_addr.sin_addr; 778137628Smlaier mask = target->ia_sockmask.sin_addr; 779137628Smlaier prefix.s_addr &= mask.s_addr; 780137628Smlaier } 781137628Smlaier 782137628Smlaier TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 783137628Smlaier if (rtinitflags(ia)) 784137628Smlaier p = ia->ia_dstaddr.sin_addr; 785137628Smlaier else { 786137628Smlaier p = ia->ia_addr.sin_addr; 787137628Smlaier p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 788137628Smlaier } 789137628Smlaier 790137628Smlaier if (prefix.s_addr != p.s_addr) 791137628Smlaier continue; 792137628Smlaier 793137628Smlaier /* 794137628Smlaier * If we got a matching prefix route inserted by other 795137628Smlaier * interface address, we are done here. 796137628Smlaier */ 797137628Smlaier if (ia->ia_flags & IFA_ROUTE) 798137628Smlaier return 0; 799137628Smlaier } 800137628Smlaier 801137628Smlaier /* 802137628Smlaier * No-one seem to have this prefix route, so we try to insert it. 803137628Smlaier */ 804137628Smlaier error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 805137628Smlaier if (!error) 806137628Smlaier target->ia_flags |= IFA_ROUTE; 807137628Smlaier return error; 808137628Smlaier} 809137628Smlaier 8101541Srgrimes/* 811137628Smlaier * If there is no other address in the system that can serve a route to the 812137628Smlaier * same prefix, remove the route. Hand over the route to the new address 813137628Smlaier * otherwise. 814137628Smlaier */ 815137628Smlaierstatic int 816137628Smlaierin_scrubprefix(target) 817137628Smlaier struct in_ifaddr *target; 818137628Smlaier{ 819137628Smlaier struct in_ifaddr *ia; 820137628Smlaier struct in_addr prefix, mask, p; 821137628Smlaier int error; 822137628Smlaier 823137628Smlaier if ((target->ia_flags & IFA_ROUTE) == 0) 824137628Smlaier return 0; 825137628Smlaier 826137628Smlaier if (rtinitflags(target)) 827137628Smlaier prefix = target->ia_dstaddr.sin_addr; 828137628Smlaier else { 829137628Smlaier prefix = target->ia_addr.sin_addr; 830137628Smlaier mask = target->ia_sockmask.sin_addr; 831137628Smlaier prefix.s_addr &= mask.s_addr; 832137628Smlaier } 833137628Smlaier 834137628Smlaier TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 835137628Smlaier if (rtinitflags(ia)) 836137628Smlaier p = ia->ia_dstaddr.sin_addr; 837137628Smlaier else { 838137628Smlaier p = ia->ia_addr.sin_addr; 839137628Smlaier p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 840137628Smlaier } 841137628Smlaier 842137628Smlaier if (prefix.s_addr != p.s_addr) 843137628Smlaier continue; 844137628Smlaier 845137628Smlaier /* 846137628Smlaier * If we got a matching prefix address, move IFA_ROUTE and 847137628Smlaier * the route itself to it. Make sure that routing daemons 848137628Smlaier * get a heads-up. 849137628Smlaier */ 850137628Smlaier if ((ia->ia_flags & IFA_ROUTE) == 0) { 851137628Smlaier rtinit(&(target->ia_ifa), (int)RTM_DELETE, 852137628Smlaier rtinitflags(target)); 853137628Smlaier target->ia_flags &= ~IFA_ROUTE; 854137628Smlaier 855137628Smlaier error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 856137628Smlaier rtinitflags(ia) | RTF_UP); 857137628Smlaier if (error == 0) 858137628Smlaier ia->ia_flags |= IFA_ROUTE; 859137628Smlaier return error; 860137628Smlaier } 861137628Smlaier } 862137628Smlaier 863137628Smlaier /* 864137628Smlaier * As no-one seem to have this prefix, we can remove the route. 865137628Smlaier */ 866137628Smlaier rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 867137628Smlaier target->ia_flags &= ~IFA_ROUTE; 868137628Smlaier return 0; 869137628Smlaier} 870137628Smlaier 871137628Smlaier#undef rtinitflags 872137628Smlaier 873137628Smlaier/* 8741541Srgrimes * Return 1 if the address might be a local broadcast address. 8751541Srgrimes */ 8761549Srgrimesint 8771541Srgrimesin_broadcast(in, ifp) 8781541Srgrimes struct in_addr in; 879133874Srwatson struct ifnet *ifp; 8801541Srgrimes{ 8811541Srgrimes register struct ifaddr *ifa; 8821541Srgrimes u_long t; 8831541Srgrimes 8841541Srgrimes if (in.s_addr == INADDR_BROADCAST || 8851541Srgrimes in.s_addr == INADDR_ANY) 8861541Srgrimes return 1; 8871541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) == 0) 8881541Srgrimes return 0; 8891541Srgrimes t = ntohl(in.s_addr); 8901541Srgrimes /* 8911541Srgrimes * Look through the list of addresses for a match 8921541Srgrimes * with a broadcast address. 8931541Srgrimes */ 8941541Srgrimes#define ia ((struct in_ifaddr *)ifa) 89574362Sphk TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 8961541Srgrimes if (ifa->ifa_addr->sa_family == AF_INET && 8971541Srgrimes (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 8981541Srgrimes in.s_addr == ia->ia_netbroadcast.s_addr || 8991541Srgrimes /* 9001541Srgrimes * Check for old-style (host 0) broadcast. 9011541Srgrimes */ 90213351Sguido t == ia->ia_subnet || t == ia->ia_net) && 90313351Sguido /* 90413351Sguido * Check for an all one subnetmask. These 90513351Sguido * only exist when an interface gets a secondary 90613351Sguido * address. 90713351Sguido */ 90813351Sguido ia->ia_subnetmask != (u_long)0xffffffff) 9091541Srgrimes return 1; 9101541Srgrimes return (0); 9111541Srgrimes#undef ia 9121541Srgrimes} 9131541Srgrimes/* 9141541Srgrimes * Add an address to the list of IP multicast addresses for a given interface. 9151541Srgrimes */ 9161541Srgrimesstruct in_multi * 9171541Srgrimesin_addmulti(ap, ifp) 9181541Srgrimes register struct in_addr *ap; 9191541Srgrimes register struct ifnet *ifp; 9201541Srgrimes{ 9211541Srgrimes register struct in_multi *inm; 92221666Swollman int error; 92321666Swollman struct sockaddr_in sin; 92421666Swollman struct ifmultiaddr *ifma; 9251541Srgrimes int s = splnet(); 9261541Srgrimes 9271541Srgrimes /* 92821666Swollman * Call generic routine to add membership or increment 92921666Swollman * refcount. It wants addresses in the form of a sockaddr, 93021666Swollman * so we build one here (being careful to zero the unused bytes). 9311541Srgrimes */ 93221666Swollman bzero(&sin, sizeof sin); 93321666Swollman sin.sin_family = AF_INET; 93421666Swollman sin.sin_len = sizeof sin; 93521666Swollman sin.sin_addr = *ap; 93621666Swollman error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 93721666Swollman if (error) { 93821666Swollman splx(s); 93921666Swollman return 0; 9401541Srgrimes } 9417280Swollman 94221666Swollman /* 94321666Swollman * If ifma->ifma_protospec is null, then if_addmulti() created 94421666Swollman * a new record. Otherwise, we are done. 94521666Swollman */ 94664853Sbde if (ifma->ifma_protospec != 0) { 94764853Sbde splx(s); 94821666Swollman return ifma->ifma_protospec; 94964853Sbde } 95021666Swollman 951111119Simp /* XXX - if_addmulti uses M_WAITOK. Can this really be called 95221666Swollman at interrupt time? If so, need to fix if_addmulti. XXX */ 95369781Sdwmalone inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, 95469781Sdwmalone M_NOWAIT | M_ZERO); 95521666Swollman if (inm == NULL) { 95621666Swollman splx(s); 95721666Swollman return (NULL); 9581541Srgrimes } 95921666Swollman 96021666Swollman inm->inm_addr = *ap; 96121666Swollman inm->inm_ifp = ifp; 96221666Swollman inm->inm_ifma = ifma; 96321666Swollman ifma->ifma_protospec = inm; 96421666Swollman LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 96521666Swollman 96621666Swollman /* 96721666Swollman * Let IGMP know that we have joined a new IP multicast group. 96821666Swollman */ 96921666Swollman igmp_joingroup(inm); 9701541Srgrimes splx(s); 9711541Srgrimes return (inm); 9721541Srgrimes} 9731541Srgrimes 9741541Srgrimes/* 9751541Srgrimes * Delete a multicast address record. 9761541Srgrimes */ 9771549Srgrimesvoid 9781541Srgrimesin_delmulti(inm) 9791541Srgrimes register struct in_multi *inm; 9801541Srgrimes{ 98121666Swollman struct ifmultiaddr *ifma = inm->inm_ifma; 98245997Sluigi struct in_multi my_inm; 9831541Srgrimes int s = splnet(); 9841541Srgrimes 98545997Sluigi my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 98621666Swollman if (ifma->ifma_refcount == 1) { 9871541Srgrimes /* 9881541Srgrimes * No remaining claims to this record; let IGMP know that 9891541Srgrimes * we are leaving the multicast group. 99045997Sluigi * But do it after the if_delmulti() which might reset 99145997Sluigi * the interface and nuke the packet. 9921541Srgrimes */ 99345997Sluigi my_inm = *inm ; 99421666Swollman ifma->ifma_protospec = 0; 99521666Swollman LIST_REMOVE(inm, inm_link); 9961541Srgrimes free(inm, M_IPMADDR); 9971541Srgrimes } 99821666Swollman /* XXX - should be separate API for when we have an ifma? */ 99921666Swollman if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 100045997Sluigi if (my_inm.inm_ifp != NULL) 100145997Sluigi igmp_leavegroup(&my_inm); 10021541Srgrimes splx(s); 10031541Srgrimes} 1004