in.c revision 149221
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 149221 2005-08-18 10:34:30Z glebius $ 321541Srgrimes */ 331541Srgrimes 34143868Sglebius#include "opt_carp.h" 35143868Sglebius 361541Srgrimes#include <sys/param.h> 371549Srgrimes#include <sys/systm.h> 3824204Sbde#include <sys/sockio.h> 391541Srgrimes#include <sys/malloc.h> 401541Srgrimes#include <sys/socket.h> 4112704Sphk#include <sys/kernel.h> 4212704Sphk#include <sys/sysctl.h> 431541Srgrimes 441541Srgrimes#include <net/if.h> 4555009Sshin#include <net/if_types.h> 461541Srgrimes#include <net/route.h> 471541Srgrimes 481541Srgrimes#include <netinet/in.h> 491541Srgrimes#include <netinet/in_var.h> 5081127Sume#include <netinet/in_pcb.h> 511541Srgrimes 526363Sphk#include <netinet/igmp_var.h> 536363Sphk 5430354Sphkstatic MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 5530309Sphk 5692723Salfredstatic int in_mask2len(struct in_addr *); 5792723Salfredstatic void in_len2mask(struct in_addr *, int); 5892723Salfredstatic int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 5992723Salfred struct ifnet *, struct thread *); 6055009Sshin 61137628Smlaierstatic int in_addprefix(struct in_ifaddr *, int); 62137628Smlaierstatic int in_scrubprefix(struct in_ifaddr *); 6392723Salfredstatic void in_socktrim(struct sockaddr_in *); 6492723Salfredstatic int in_ifinit(struct ifnet *, 6592723Salfred struct in_ifaddr *, struct sockaddr_in *, int); 661541Srgrimes 6718193Swollmanstatic int subnetsarelocal = 0; 68133874SrwatsonSYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 69123998Sru &subnetsarelocal, 0, "Treat all subnets as directly connected"); 70149221Sglebiusstatic int sameprefixcarponly = 0; 71149221SglebiusSYSCTL_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW, 72149221Sglebius &sameprefixcarponly, 0, 73149221Sglebius "Refuse to create same prefixes on different interfaces"); 7421666Swollman 75148682Srwatson/* 76148682Srwatson * The IPv4 multicast list (in_multihead and associated structures) are 77148682Srwatson * protected by the global in_multi_mtx. See in_var.h for more details. For 78148682Srwatson * now, in_multi_mtx is marked as recursible due to IGMP's calling back into 79148682Srwatson * ip_output() to send IGMP packets while holding the lock; this probably is 80148682Srwatson * not quite desirable. 81148682Srwatson */ 8221666Swollmanstruct in_multihead in_multihead; /* XXX BSS initialization */ 83148682Srwatsonstruct mtx in_multi_mtx; 84148682SrwatsonMTX_SYSINIT(in_multi_mtx, &in_multi_mtx, "in_multi_mtx", MTX_DEF | MTX_RECURSE); 8521666Swollman 8681127Sumeextern struct inpcbinfo ripcbinfo; 8781127Sumeextern struct inpcbinfo udbinfo; 8881127Sume 891541Srgrimes/* 901541Srgrimes * Return 1 if an internet address is for a ``local'' host 911541Srgrimes * (one to which we have a connection). If subnetsarelocal 921541Srgrimes * is true, this includes other subnets of the local net. 931541Srgrimes * Otherwise, it includes only the directly-connected (sub)nets. 941541Srgrimes */ 951549Srgrimesint 961541Srgrimesin_localaddr(in) 971541Srgrimes struct in_addr in; 981541Srgrimes{ 991541Srgrimes register u_long i = ntohl(in.s_addr); 1001541Srgrimes register struct in_ifaddr *ia; 1011541Srgrimes 1021541Srgrimes if (subnetsarelocal) { 10374362Sphk TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 1041541Srgrimes if ((i & ia->ia_netmask) == ia->ia_net) 1051541Srgrimes return (1); 1061541Srgrimes } else { 10772012Sphk TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 1081541Srgrimes if ((i & ia->ia_subnetmask) == ia->ia_subnet) 1091541Srgrimes return (1); 1101541Srgrimes } 1111541Srgrimes return (0); 1121541Srgrimes} 1131541Srgrimes 1141541Srgrimes/* 115133486Sandre * Return 1 if an internet address is for the local host and configured 116133486Sandre * on one of its interfaces. 117133486Sandre */ 118133486Sandreint 119133486Sandrein_localip(in) 120133486Sandre struct in_addr in; 121133486Sandre{ 122133486Sandre struct in_ifaddr *ia; 123133486Sandre 124133486Sandre LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 125133486Sandre if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) 126133486Sandre return 1; 127133486Sandre } 128133486Sandre return 0; 129133486Sandre} 130133486Sandre 131133486Sandre/* 1321541Srgrimes * Determine whether an IP address is in a reserved set of addresses 1331541Srgrimes * that may not be forwarded, or whether datagrams to that destination 1341541Srgrimes * may be forwarded. 1351541Srgrimes */ 1361549Srgrimesint 1371541Srgrimesin_canforward(in) 1381541Srgrimes struct in_addr in; 1391541Srgrimes{ 1401541Srgrimes register u_long i = ntohl(in.s_addr); 1411541Srgrimes register u_long net; 1421541Srgrimes 1431541Srgrimes if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 1441541Srgrimes return (0); 1451541Srgrimes if (IN_CLASSA(i)) { 1461541Srgrimes net = i & IN_CLASSA_NET; 1471541Srgrimes if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 1481541Srgrimes return (0); 1491541Srgrimes } 1501541Srgrimes return (1); 1511541Srgrimes} 1521541Srgrimes 1531541Srgrimes/* 1541541Srgrimes * Trim a mask in a sockaddr 1551541Srgrimes */ 15612296Sphkstatic void 1571541Srgrimesin_socktrim(ap) 1581541Srgrimesstruct sockaddr_in *ap; 1591541Srgrimes{ 1601541Srgrimes register char *cplim = (char *) &ap->sin_addr; 1611541Srgrimes register char *cp = (char *) (&ap->sin_addr + 1); 1621541Srgrimes 1631541Srgrimes ap->sin_len = 0; 1644127Swollman while (--cp >= cplim) 165133874Srwatson if (*cp) { 1661541Srgrimes (ap)->sin_len = cp - (char *) (ap) + 1; 1671541Srgrimes break; 1681541Srgrimes } 1691541Srgrimes} 1701541Srgrimes 17155009Sshinstatic int 17255009Sshinin_mask2len(mask) 17355009Sshin struct in_addr *mask; 17455009Sshin{ 17555009Sshin int x, y; 17655009Sshin u_char *p; 17755009Sshin 17855009Sshin p = (u_char *)mask; 17955009Sshin for (x = 0; x < sizeof(*mask); x++) { 18055009Sshin if (p[x] != 0xff) 18155009Sshin break; 18255009Sshin } 18355009Sshin y = 0; 18455009Sshin if (x < sizeof(*mask)) { 18555009Sshin for (y = 0; y < 8; y++) { 18655009Sshin if ((p[x] & (0x80 >> y)) == 0) 18755009Sshin break; 18855009Sshin } 18955009Sshin } 19055009Sshin return x * 8 + y; 19155009Sshin} 19255009Sshin 19355009Sshinstatic void 19455009Sshinin_len2mask(mask, len) 19555009Sshin struct in_addr *mask; 19655009Sshin int len; 19755009Sshin{ 19855009Sshin int i; 19955009Sshin u_char *p; 20055009Sshin 20155009Sshin p = (u_char *)mask; 20255009Sshin bzero(mask, sizeof(*mask)); 20355009Sshin for (i = 0; i < len / 8; i++) 20455009Sshin p[i] = 0xff; 20555009Sshin if (len % 8) 20655009Sshin p[i] = (0xff00 >> (len % 8)) & 0xff; 20755009Sshin} 20855009Sshin 2091541Srgrimes/* 2101541Srgrimes * Generic internet control operations (ioctl's). 2111541Srgrimes * Ifp is 0 if not an interface-specific ioctl. 2121541Srgrimes */ 2131541Srgrimes/* ARGSUSED */ 2141549Srgrimesint 21583366Sjulianin_control(so, cmd, data, ifp, td) 2161541Srgrimes struct socket *so; 21736735Sdfr u_long cmd; 2181541Srgrimes caddr_t data; 2191541Srgrimes register struct ifnet *ifp; 22083366Sjulian struct thread *td; 2211541Srgrimes{ 2221541Srgrimes register struct ifreq *ifr = (struct ifreq *)data; 22314632Sfenner register struct in_ifaddr *ia = 0, *iap; 2241541Srgrimes register struct ifaddr *ifa; 22584102Sjlemon struct in_addr dst; 2261541Srgrimes struct in_ifaddr *oia; 2271541Srgrimes struct in_aliasreq *ifra = (struct in_aliasreq *)data; 2281541Srgrimes struct sockaddr_in oldaddr; 22987124Sbrian int error, hostIsNew, iaIsNew, maskIsNew, s; 2301541Srgrimes 23187124Sbrian iaIsNew = 0; 23287124Sbrian 23355009Sshin switch (cmd) { 23455009Sshin case SIOCALIFADDR: 23555009Sshin case SIOCDLIFADDR: 23693593Sjhb if (td && (error = suser(td)) != 0) 23755009Sshin return error; 23855009Sshin /*fall through*/ 23955009Sshin case SIOCGLIFADDR: 24055009Sshin if (!ifp) 24155009Sshin return EINVAL; 24283366Sjulian return in_lifaddr_ioctl(so, cmd, data, ifp, td); 24355009Sshin } 24455009Sshin 2451541Srgrimes /* 2461541Srgrimes * Find address for this interface, if it exists. 24714632Sfenner * 24814632Sfenner * If an alias address was specified, find that one instead of 24984102Sjlemon * the first one on the interface, if possible. 2501541Srgrimes */ 25184102Sjlemon if (ifp) { 25284102Sjlemon dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 25384102Sjlemon LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 25484102Sjlemon if (iap->ia_ifp == ifp && 25584102Sjlemon iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 25684102Sjlemon ia = iap; 25784102Sjlemon break; 25884102Sjlemon } 25984102Sjlemon if (ia == NULL) 26084102Sjlemon TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 26184102Sjlemon iap = ifatoia(ifa); 26284102Sjlemon if (iap->ia_addr.sin_family == AF_INET) { 26314632Sfenner ia = iap; 26414632Sfenner break; 26514632Sfenner } 26614632Sfenner } 26784102Sjlemon } 2681541Srgrimes 2691541Srgrimes switch (cmd) { 2701541Srgrimes 2711541Srgrimes case SIOCAIFADDR: 2721541Srgrimes case SIOCDIFADDR: 27341575Seivind if (ifp == 0) 27441575Seivind return (EADDRNOTAVAIL); 2758071Swollman if (ifra->ifra_addr.sin_family == AF_INET) { 27671999Sphk for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 2778071Swollman if (ia->ia_ifp == ifp && 2788071Swollman ia->ia_addr.sin_addr.s_addr == 2798071Swollman ifra->ifra_addr.sin_addr.s_addr) 2808071Swollman break; 2818071Swollman } 2828876Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) 2838071Swollman && (cmd == SIOCAIFADDR) 2848071Swollman && (ifra->ifra_dstaddr.sin_addr.s_addr 2858071Swollman == INADDR_ANY)) { 2869563Swollman return EDESTADDRREQ; 2878071Swollman } 2881541Srgrimes } 2891541Srgrimes if (cmd == SIOCDIFADDR && ia == 0) 2901541Srgrimes return (EADDRNOTAVAIL); 2911541Srgrimes /* FALLTHROUGH */ 2921541Srgrimes case SIOCSIFADDR: 2931541Srgrimes case SIOCSIFNETMASK: 2941541Srgrimes case SIOCSIFDSTADDR: 29593593Sjhb if (td && (error = suser(td)) != 0) 29625201Swollman return error; 2971541Srgrimes 2981541Srgrimes if (ifp == 0) 29941575Seivind return (EADDRNOTAVAIL); 3001541Srgrimes if (ia == (struct in_ifaddr *)0) { 30120407Swollman ia = (struct in_ifaddr *) 302111119Simp malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO); 30320407Swollman if (ia == (struct in_ifaddr *)NULL) 3041541Srgrimes return (ENOBUFS); 30515092Sdg /* 30615092Sdg * Protect from ipintr() traversing address list 30715092Sdg * while we're modifying it. 30815092Sdg */ 30915092Sdg s = splnet(); 31020407Swollman TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 311108033Shsu 31220407Swollman ifa = &ia->ia_ifa; 313108033Shsu IFA_LOCK_INIT(ifa); 31420407Swollman ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 31520407Swollman ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 31620407Swollman ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 317108033Shsu ifa->ifa_refcnt = 1; 318108033Shsu TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 319108033Shsu 3201541Srgrimes ia->ia_sockmask.sin_len = 8; 32185740Sdes ia->ia_sockmask.sin_family = AF_INET; 3221541Srgrimes if (ifp->if_flags & IFF_BROADCAST) { 3231541Srgrimes ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 3241541Srgrimes ia->ia_broadaddr.sin_family = AF_INET; 3251541Srgrimes } 3261541Srgrimes ia->ia_ifp = ifp; 32715092Sdg splx(s); 32887124Sbrian iaIsNew = 1; 3291541Srgrimes } 3301541Srgrimes break; 3311541Srgrimes 3321541Srgrimes case SIOCSIFBRDADDR: 33393593Sjhb if (td && (error = suser(td)) != 0) 33425201Swollman return error; 3351541Srgrimes /* FALLTHROUGH */ 3361541Srgrimes 3371541Srgrimes case SIOCGIFADDR: 3381541Srgrimes case SIOCGIFNETMASK: 3391541Srgrimes case SIOCGIFDSTADDR: 3401541Srgrimes case SIOCGIFBRDADDR: 3411541Srgrimes if (ia == (struct in_ifaddr *)0) 3421541Srgrimes return (EADDRNOTAVAIL); 3431541Srgrimes break; 3441541Srgrimes } 3451541Srgrimes switch (cmd) { 3461541Srgrimes 3471541Srgrimes case SIOCGIFADDR: 3481541Srgrimes *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 34987124Sbrian return (0); 3501541Srgrimes 3511541Srgrimes case SIOCGIFBRDADDR: 3521541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) == 0) 3531541Srgrimes return (EINVAL); 3541541Srgrimes *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 35587124Sbrian return (0); 3561541Srgrimes 3571541Srgrimes case SIOCGIFDSTADDR: 3581541Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 3591541Srgrimes return (EINVAL); 3601541Srgrimes *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 36187124Sbrian return (0); 3621541Srgrimes 3631541Srgrimes case SIOCGIFNETMASK: 3641541Srgrimes *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 36587124Sbrian return (0); 3661541Srgrimes 3671541Srgrimes case SIOCSIFDSTADDR: 3681541Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 3691541Srgrimes return (EINVAL); 3701541Srgrimes oldaddr = ia->ia_dstaddr; 3711541Srgrimes ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 372146883Siedowse if (ifp->if_ioctl) { 373146883Siedowse IFF_LOCKGIANT(ifp); 374146883Siedowse error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 375146883Siedowse (caddr_t)ia); 376146883Siedowse IFF_UNLOCKGIANT(ifp); 377146883Siedowse if (error) { 378146883Siedowse ia->ia_dstaddr = oldaddr; 379146883Siedowse return (error); 380146883Siedowse } 3811541Srgrimes } 3821541Srgrimes if (ia->ia_flags & IFA_ROUTE) { 3831541Srgrimes ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 3841541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 3851541Srgrimes ia->ia_ifa.ifa_dstaddr = 3861541Srgrimes (struct sockaddr *)&ia->ia_dstaddr; 3871541Srgrimes rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 3881541Srgrimes } 38987124Sbrian return (0); 3901541Srgrimes 3911541Srgrimes case SIOCSIFBRDADDR: 3921541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) == 0) 3931541Srgrimes return (EINVAL); 3941541Srgrimes ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 39587124Sbrian return (0); 3961541Srgrimes 3971541Srgrimes case SIOCSIFADDR: 39887124Sbrian error = in_ifinit(ifp, ia, 39987124Sbrian (struct sockaddr_in *) &ifr->ifr_addr, 1); 40087124Sbrian if (error != 0 && iaIsNew) 40187124Sbrian break; 402126264Smlaier if (error == 0) 403126264Smlaier EVENTHANDLER_INVOKE(ifaddr_event, ifp); 40487124Sbrian return (0); 4051541Srgrimes 4061541Srgrimes case SIOCSIFNETMASK: 40785740Sdes ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 40885740Sdes ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 40987124Sbrian return (0); 4101541Srgrimes 4111541Srgrimes case SIOCAIFADDR: 4121541Srgrimes maskIsNew = 0; 4131541Srgrimes hostIsNew = 1; 4141541Srgrimes error = 0; 4151541Srgrimes if (ia->ia_addr.sin_family == AF_INET) { 4161541Srgrimes if (ifra->ifra_addr.sin_len == 0) { 4171541Srgrimes ifra->ifra_addr = ia->ia_addr; 4181541Srgrimes hostIsNew = 0; 4191541Srgrimes } else if (ifra->ifra_addr.sin_addr.s_addr == 4201541Srgrimes ia->ia_addr.sin_addr.s_addr) 4211541Srgrimes hostIsNew = 0; 4221541Srgrimes } 4231541Srgrimes if (ifra->ifra_mask.sin_len) { 4241541Srgrimes in_ifscrub(ifp, ia); 4251541Srgrimes ia->ia_sockmask = ifra->ifra_mask; 42685740Sdes ia->ia_sockmask.sin_family = AF_INET; 4271541Srgrimes ia->ia_subnetmask = 4281541Srgrimes ntohl(ia->ia_sockmask.sin_addr.s_addr); 4291541Srgrimes maskIsNew = 1; 4301541Srgrimes } 4311541Srgrimes if ((ifp->if_flags & IFF_POINTOPOINT) && 4321541Srgrimes (ifra->ifra_dstaddr.sin_family == AF_INET)) { 4331541Srgrimes in_ifscrub(ifp, ia); 4341541Srgrimes ia->ia_dstaddr = ifra->ifra_dstaddr; 4351541Srgrimes maskIsNew = 1; /* We lie; but the effect's the same */ 4361541Srgrimes } 4371541Srgrimes if (ifra->ifra_addr.sin_family == AF_INET && 4381541Srgrimes (hostIsNew || maskIsNew)) 4391541Srgrimes error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 44087124Sbrian if (error != 0 && iaIsNew) 44187124Sbrian break; 44287124Sbrian 4431541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) && 4441541Srgrimes (ifra->ifra_broadaddr.sin_family == AF_INET)) 4451541Srgrimes ia->ia_broadaddr = ifra->ifra_broadaddr; 446126264Smlaier if (error == 0) 447126264Smlaier EVENTHANDLER_INVOKE(ifaddr_event, ifp); 4481541Srgrimes return (error); 4491541Srgrimes 4501541Srgrimes case SIOCDIFADDR: 45174299Sru /* 45274299Sru * in_ifscrub kills the interface route. 45374299Sru */ 4541541Srgrimes in_ifscrub(ifp, ia); 45515092Sdg /* 45674299Sru * in_ifadown gets rid of all the rest of 45774299Sru * the routes. This is not quite the right 45874299Sru * thing to do, but at least if we are running 45974299Sru * a routing process they will come back. 46074299Sru */ 46176469Sru in_ifadown(&ia->ia_ifa, 1); 46281127Sume /* 46381127Sume * XXX horrible hack to detect that we are being called 46481127Sume * from if_detach() 46581127Sume */ 466121922Ssam if (ifaddr_byindex(ifp->if_index) == NULL) { 46798102Shsu in_pcbpurgeif0(&ripcbinfo, ifp); 46898102Shsu in_pcbpurgeif0(&udbinfo, ifp); 46981127Sume } 470126264Smlaier EVENTHANDLER_INVOKE(ifaddr_event, ifp); 47187124Sbrian error = 0; 4721541Srgrimes break; 4731541Srgrimes 4741541Srgrimes default: 4751541Srgrimes if (ifp == 0 || ifp->if_ioctl == 0) 4761541Srgrimes return (EOPNOTSUPP); 477146883Siedowse IFF_LOCKGIANT(ifp); 478146883Siedowse error = (*ifp->if_ioctl)(ifp, cmd, data); 479146883Siedowse IFF_UNLOCKGIANT(ifp); 480146883Siedowse return (error); 4811541Srgrimes } 48287124Sbrian 48387124Sbrian /* 48487124Sbrian * Protect from ipintr() traversing address list while we're modifying 48587124Sbrian * it. 48687124Sbrian */ 48787124Sbrian s = splnet(); 48887124Sbrian TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 48987124Sbrian TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 49087124Sbrian LIST_REMOVE(ia, ia_hash); 49187124Sbrian IFAFREE(&ia->ia_ifa); 49287124Sbrian splx(s); 49387124Sbrian 49487124Sbrian return (error); 4951541Srgrimes} 4961541Srgrimes 4971541Srgrimes/* 49855009Sshin * SIOC[GAD]LIFADDR. 49955009Sshin * SIOCGLIFADDR: get first address. (?!?) 50055009Sshin * SIOCGLIFADDR with IFLR_PREFIX: 50155009Sshin * get first address that matches the specified prefix. 50255009Sshin * SIOCALIFADDR: add the specified address. 50355009Sshin * SIOCALIFADDR with IFLR_PREFIX: 50455009Sshin * EINVAL since we can't deduce hostid part of the address. 50555009Sshin * SIOCDLIFADDR: delete the specified address. 50655009Sshin * SIOCDLIFADDR with IFLR_PREFIX: 50755009Sshin * delete the first address that matches the specified prefix. 50855009Sshin * return values: 50955009Sshin * EINVAL on invalid parameters 51055009Sshin * EADDRNOTAVAIL on prefix match failed/specified address not found 51155009Sshin * other values may be returned from in_ioctl() 51255009Sshin */ 51355009Sshinstatic int 51483366Sjulianin_lifaddr_ioctl(so, cmd, data, ifp, td) 51555009Sshin struct socket *so; 51655009Sshin u_long cmd; 51755009Sshin caddr_t data; 51855009Sshin struct ifnet *ifp; 51983366Sjulian struct thread *td; 52055009Sshin{ 52155009Sshin struct if_laddrreq *iflr = (struct if_laddrreq *)data; 52255009Sshin struct ifaddr *ifa; 52355009Sshin 52455009Sshin /* sanity checks */ 52555009Sshin if (!data || !ifp) { 52655009Sshin panic("invalid argument to in_lifaddr_ioctl"); 52755009Sshin /*NOTRECHED*/ 52855009Sshin } 52955009Sshin 53055009Sshin switch (cmd) { 53155009Sshin case SIOCGLIFADDR: 53255009Sshin /* address must be specified on GET with IFLR_PREFIX */ 53355009Sshin if ((iflr->flags & IFLR_PREFIX) == 0) 53455009Sshin break; 53555009Sshin /*FALLTHROUGH*/ 53655009Sshin case SIOCALIFADDR: 53755009Sshin case SIOCDLIFADDR: 53855009Sshin /* address must be specified on ADD and DELETE */ 53955917Sshin if (iflr->addr.ss_family != AF_INET) 54055009Sshin return EINVAL; 54155917Sshin if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 54255009Sshin return EINVAL; 54355009Sshin /* XXX need improvement */ 54455917Sshin if (iflr->dstaddr.ss_family 54555917Sshin && iflr->dstaddr.ss_family != AF_INET) 54655009Sshin return EINVAL; 54755917Sshin if (iflr->dstaddr.ss_family 54855917Sshin && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 54955009Sshin return EINVAL; 55055009Sshin break; 55155009Sshin default: /*shouldn't happen*/ 55255009Sshin return EOPNOTSUPP; 55355009Sshin } 55455009Sshin if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 55555009Sshin return EINVAL; 55655009Sshin 55755009Sshin switch (cmd) { 55855009Sshin case SIOCALIFADDR: 55955009Sshin { 56055009Sshin struct in_aliasreq ifra; 56155009Sshin 56255009Sshin if (iflr->flags & IFLR_PREFIX) 56355009Sshin return EINVAL; 56455009Sshin 56555009Sshin /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 56655009Sshin bzero(&ifra, sizeof(ifra)); 56755009Sshin bcopy(iflr->iflr_name, ifra.ifra_name, 56855009Sshin sizeof(ifra.ifra_name)); 56955009Sshin 57055917Sshin bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 57155009Sshin 57255917Sshin if (iflr->dstaddr.ss_family) { /*XXX*/ 57355009Sshin bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 57455917Sshin iflr->dstaddr.ss_len); 57555009Sshin } 57655009Sshin 57755009Sshin ifra.ifra_mask.sin_family = AF_INET; 57855009Sshin ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 57955009Sshin in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 58055009Sshin 58183366Sjulian return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 58255009Sshin } 58355009Sshin case SIOCGLIFADDR: 58455009Sshin case SIOCDLIFADDR: 58555009Sshin { 58655009Sshin struct in_ifaddr *ia; 58755009Sshin struct in_addr mask, candidate, match; 58855009Sshin struct sockaddr_in *sin; 58955009Sshin int cmp; 59055009Sshin 59155009Sshin bzero(&mask, sizeof(mask)); 59255009Sshin if (iflr->flags & IFLR_PREFIX) { 59355009Sshin /* lookup a prefix rather than address. */ 59455009Sshin in_len2mask(&mask, iflr->prefixlen); 59555009Sshin 59655009Sshin sin = (struct sockaddr_in *)&iflr->addr; 59755009Sshin match.s_addr = sin->sin_addr.s_addr; 59855009Sshin match.s_addr &= mask.s_addr; 59955009Sshin 60055009Sshin /* if you set extra bits, that's wrong */ 60155009Sshin if (match.s_addr != sin->sin_addr.s_addr) 60255009Sshin return EINVAL; 60355009Sshin 60455009Sshin cmp = 1; 60555009Sshin } else { 60655009Sshin if (cmd == SIOCGLIFADDR) { 60755009Sshin /* on getting an address, take the 1st match */ 60855009Sshin cmp = 0; /*XXX*/ 60955009Sshin } else { 61055009Sshin /* on deleting an address, do exact match */ 61155009Sshin in_len2mask(&mask, 32); 61255009Sshin sin = (struct sockaddr_in *)&iflr->addr; 61355009Sshin match.s_addr = sin->sin_addr.s_addr; 61455009Sshin 61555009Sshin cmp = 1; 61655009Sshin } 61755009Sshin } 61855009Sshin 61955009Sshin TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 62055009Sshin if (ifa->ifa_addr->sa_family != AF_INET6) 62155009Sshin continue; 62255009Sshin if (!cmp) 62355009Sshin break; 62455009Sshin candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 62555009Sshin candidate.s_addr &= mask.s_addr; 62655009Sshin if (candidate.s_addr == match.s_addr) 62755009Sshin break; 62855009Sshin } 62955009Sshin if (!ifa) 63055009Sshin return EADDRNOTAVAIL; 63155009Sshin ia = (struct in_ifaddr *)ifa; 63255009Sshin 63355009Sshin if (cmd == SIOCGLIFADDR) { 63455009Sshin /* fill in the if_laddrreq structure */ 63555009Sshin bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 63655009Sshin 63755009Sshin if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 63855009Sshin bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 63955009Sshin ia->ia_dstaddr.sin_len); 64055009Sshin } else 64155009Sshin bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 64255009Sshin 64355009Sshin iflr->prefixlen = 64455009Sshin in_mask2len(&ia->ia_sockmask.sin_addr); 64555009Sshin 64655009Sshin iflr->flags = 0; /*XXX*/ 64755009Sshin 64855009Sshin return 0; 64955009Sshin } else { 65055009Sshin struct in_aliasreq ifra; 65155009Sshin 65255009Sshin /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 65355009Sshin bzero(&ifra, sizeof(ifra)); 65455009Sshin bcopy(iflr->iflr_name, ifra.ifra_name, 65555009Sshin sizeof(ifra.ifra_name)); 65655009Sshin 65755009Sshin bcopy(&ia->ia_addr, &ifra.ifra_addr, 65855009Sshin ia->ia_addr.sin_len); 65955009Sshin if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 66055009Sshin bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 66155009Sshin ia->ia_dstaddr.sin_len); 66255009Sshin } 66355009Sshin bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 66455009Sshin ia->ia_sockmask.sin_len); 66555009Sshin 66655009Sshin return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 66783366Sjulian ifp, td); 66855009Sshin } 66955009Sshin } 67055009Sshin } 67155009Sshin 67255009Sshin return EOPNOTSUPP; /*just for safety*/ 67355009Sshin} 67455009Sshin 67555009Sshin/* 6761541Srgrimes * Delete any existing route for an interface. 6771541Srgrimes */ 67822672Swollmanvoid 6791541Srgrimesin_ifscrub(ifp, ia) 6801541Srgrimes register struct ifnet *ifp; 6811541Srgrimes register struct in_ifaddr *ia; 6821541Srgrimes{ 683137628Smlaier in_scrubprefix(ia); 6841541Srgrimes} 6851541Srgrimes 6861541Srgrimes/* 6871541Srgrimes * Initialize an interface's internet address 6881541Srgrimes * and routing table entry. 6891541Srgrimes */ 69012296Sphkstatic int 6911541Srgrimesin_ifinit(ifp, ia, sin, scrub) 6921541Srgrimes register struct ifnet *ifp; 6931541Srgrimes register struct in_ifaddr *ia; 6941541Srgrimes struct sockaddr_in *sin; 6951541Srgrimes int scrub; 6961541Srgrimes{ 6971541Srgrimes register u_long i = ntohl(sin->sin_addr.s_addr); 6981541Srgrimes struct sockaddr_in oldaddr; 69994326Sbrian int s = splimp(), flags = RTF_UP, error = 0; 7001541Srgrimes 7011541Srgrimes oldaddr = ia->ia_addr; 702105748Ssuz if (oldaddr.sin_family == AF_INET) 703105748Ssuz LIST_REMOVE(ia, ia_hash); 7041541Srgrimes ia->ia_addr = *sin; 705105748Ssuz if (ia->ia_addr.sin_family == AF_INET) 706105748Ssuz LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 707105748Ssuz ia, ia_hash); 7081541Srgrimes /* 7091541Srgrimes * Give the interface a chance to initialize 7101541Srgrimes * if this is its first address, 7111541Srgrimes * and to validate the address if necessary. 7121541Srgrimes */ 713146883Siedowse if (ifp->if_ioctl) { 714146883Siedowse IFF_LOCKGIANT(ifp); 715146883Siedowse error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 716146883Siedowse IFF_UNLOCKGIANT(ifp); 717146883Siedowse if (error) { 718146883Siedowse splx(s); 719146883Siedowse /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 720146883Siedowse ia->ia_addr = oldaddr; 721146883Siedowse if (ia->ia_addr.sin_family == AF_INET) 722146883Siedowse LIST_INSERT_HEAD(INADDR_HASH( 723146883Siedowse ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 724146883Siedowse return (error); 725146883Siedowse } 7261541Srgrimes } 7271541Srgrimes splx(s); 7281541Srgrimes if (scrub) { 7291541Srgrimes ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 7301541Srgrimes in_ifscrub(ifp, ia); 7311541Srgrimes ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 7321541Srgrimes } 7331541Srgrimes if (IN_CLASSA(i)) 7341541Srgrimes ia->ia_netmask = IN_CLASSA_NET; 7351541Srgrimes else if (IN_CLASSB(i)) 7361541Srgrimes ia->ia_netmask = IN_CLASSB_NET; 7371541Srgrimes else 7381541Srgrimes ia->ia_netmask = IN_CLASSC_NET; 7391541Srgrimes /* 7401541Srgrimes * The subnet mask usually includes at least the standard network part, 7411541Srgrimes * but may may be smaller in the case of supernetting. 7421541Srgrimes * If it is set, we believe it. 7431541Srgrimes */ 7441541Srgrimes if (ia->ia_subnetmask == 0) { 7451541Srgrimes ia->ia_subnetmask = ia->ia_netmask; 7461541Srgrimes ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 7471541Srgrimes } else 7481541Srgrimes ia->ia_netmask &= ia->ia_subnetmask; 7491541Srgrimes ia->ia_net = i & ia->ia_netmask; 7501541Srgrimes ia->ia_subnet = i & ia->ia_subnetmask; 7511541Srgrimes in_socktrim(&ia->ia_sockmask); 752143868Sglebius#ifdef DEV_CARP 7531541Srgrimes /* 754143868Sglebius * XXX: carp(4) does not have interface route 755143868Sglebius */ 756143868Sglebius if (ifp->if_type == IFT_CARP) 757143868Sglebius return (0); 758143868Sglebius#endif 759143868Sglebius /* 7601541Srgrimes * Add route for the network. 7611541Srgrimes */ 7621541Srgrimes ia->ia_ifa.ifa_metric = ifp->if_metric; 7631541Srgrimes if (ifp->if_flags & IFF_BROADCAST) { 7641541Srgrimes ia->ia_broadaddr.sin_addr.s_addr = 7651541Srgrimes htonl(ia->ia_subnet | ~ia->ia_subnetmask); 7661541Srgrimes ia->ia_netbroadcast.s_addr = 7671541Srgrimes htonl(ia->ia_net | ~ ia->ia_netmask); 7681541Srgrimes } else if (ifp->if_flags & IFF_LOOPBACK) { 769137833Smlaier ia->ia_dstaddr = ia->ia_addr; 7701541Srgrimes flags |= RTF_HOST; 7711541Srgrimes } else if (ifp->if_flags & IFF_POINTOPOINT) { 7721541Srgrimes if (ia->ia_dstaddr.sin_family != AF_INET) 7731541Srgrimes return (0); 7741541Srgrimes flags |= RTF_HOST; 7751541Srgrimes } 776137628Smlaier if ((error = in_addprefix(ia, flags)) != 0) 777137628Smlaier return (error); 77894326Sbrian 7791541Srgrimes /* 7801541Srgrimes * If the interface supports multicast, join the "all hosts" 7811541Srgrimes * multicast group on that interface. 7821541Srgrimes */ 7831541Srgrimes if (ifp->if_flags & IFF_MULTICAST) { 7841541Srgrimes struct in_addr addr; 7851541Srgrimes 7861541Srgrimes addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 7871541Srgrimes in_addmulti(&addr, ifp); 7881541Srgrimes } 7891541Srgrimes return (error); 7901541Srgrimes} 7911541Srgrimes 792137628Smlaier#define rtinitflags(x) \ 793137628Smlaier ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 794137628Smlaier ? RTF_HOST : 0) 795137628Smlaier/* 796137628Smlaier * Check if we have a route for the given prefix already or add a one 797137628Smlaier * accordingly. 798137628Smlaier */ 799137628Smlaierstatic int 800137628Smlaierin_addprefix(target, flags) 801137628Smlaier struct in_ifaddr *target; 802137628Smlaier int flags; 803137628Smlaier{ 804137628Smlaier struct in_ifaddr *ia; 805137628Smlaier struct in_addr prefix, mask, p; 806137628Smlaier int error; 8071541Srgrimes 808137628Smlaier if ((flags & RTF_HOST) != 0) 809137628Smlaier prefix = target->ia_dstaddr.sin_addr; 810137628Smlaier else { 811137628Smlaier prefix = target->ia_addr.sin_addr; 812137628Smlaier mask = target->ia_sockmask.sin_addr; 813137628Smlaier prefix.s_addr &= mask.s_addr; 814137628Smlaier } 815137628Smlaier 816137628Smlaier TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 817137628Smlaier if (rtinitflags(ia)) 818137628Smlaier p = ia->ia_dstaddr.sin_addr; 819137628Smlaier else { 820137628Smlaier p = ia->ia_addr.sin_addr; 821137628Smlaier p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 822137628Smlaier } 823137628Smlaier 824137628Smlaier if (prefix.s_addr != p.s_addr) 825137628Smlaier continue; 826137628Smlaier 827137628Smlaier /* 828137628Smlaier * If we got a matching prefix route inserted by other 829137628Smlaier * interface address, we are done here. 830137628Smlaier */ 831149221Sglebius if (ia->ia_flags & IFA_ROUTE) { 832149221Sglebius if (sameprefixcarponly && 833149221Sglebius target->ia_ifp->if_type != IFT_CARP && 834149221Sglebius ia->ia_ifp->if_type != IFT_CARP) 835149221Sglebius return (EEXIST); 836149221Sglebius else 837149221Sglebius return (0); 838149221Sglebius } 839137628Smlaier } 840137628Smlaier 841137628Smlaier /* 842137628Smlaier * No-one seem to have this prefix route, so we try to insert it. 843137628Smlaier */ 844137628Smlaier error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 845137628Smlaier if (!error) 846137628Smlaier target->ia_flags |= IFA_ROUTE; 847137628Smlaier return error; 848137628Smlaier} 849137628Smlaier 8501541Srgrimes/* 851137628Smlaier * If there is no other address in the system that can serve a route to the 852137628Smlaier * same prefix, remove the route. Hand over the route to the new address 853137628Smlaier * otherwise. 854137628Smlaier */ 855137628Smlaierstatic int 856137628Smlaierin_scrubprefix(target) 857137628Smlaier struct in_ifaddr *target; 858137628Smlaier{ 859137628Smlaier struct in_ifaddr *ia; 860137628Smlaier struct in_addr prefix, mask, p; 861137628Smlaier int error; 862137628Smlaier 863137628Smlaier if ((target->ia_flags & IFA_ROUTE) == 0) 864137628Smlaier return 0; 865137628Smlaier 866137628Smlaier if (rtinitflags(target)) 867137628Smlaier prefix = target->ia_dstaddr.sin_addr; 868137628Smlaier else { 869137628Smlaier prefix = target->ia_addr.sin_addr; 870137628Smlaier mask = target->ia_sockmask.sin_addr; 871137628Smlaier prefix.s_addr &= mask.s_addr; 872137628Smlaier } 873137628Smlaier 874137628Smlaier TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 875137628Smlaier if (rtinitflags(ia)) 876137628Smlaier p = ia->ia_dstaddr.sin_addr; 877137628Smlaier else { 878137628Smlaier p = ia->ia_addr.sin_addr; 879137628Smlaier p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 880137628Smlaier } 881137628Smlaier 882137628Smlaier if (prefix.s_addr != p.s_addr) 883137628Smlaier continue; 884137628Smlaier 885137628Smlaier /* 886137628Smlaier * If we got a matching prefix address, move IFA_ROUTE and 887137628Smlaier * the route itself to it. Make sure that routing daemons 888137628Smlaier * get a heads-up. 889143868Sglebius * 890143868Sglebius * XXX: a special case for carp(4) interface 891137628Smlaier */ 892143868Sglebius if ((ia->ia_flags & IFA_ROUTE) == 0 893143868Sglebius#ifdef DEV_CARP 894143868Sglebius && (ia->ia_ifp->if_type != IFT_CARP) 895143868Sglebius#endif 896143868Sglebius ) { 897137628Smlaier rtinit(&(target->ia_ifa), (int)RTM_DELETE, 898137628Smlaier rtinitflags(target)); 899137628Smlaier target->ia_flags &= ~IFA_ROUTE; 900137628Smlaier 901137628Smlaier error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 902137628Smlaier rtinitflags(ia) | RTF_UP); 903137628Smlaier if (error == 0) 904137628Smlaier ia->ia_flags |= IFA_ROUTE; 905137628Smlaier return error; 906137628Smlaier } 907137628Smlaier } 908137628Smlaier 909137628Smlaier /* 910137628Smlaier * As no-one seem to have this prefix, we can remove the route. 911137628Smlaier */ 912137628Smlaier rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 913137628Smlaier target->ia_flags &= ~IFA_ROUTE; 914137628Smlaier return 0; 915137628Smlaier} 916137628Smlaier 917137628Smlaier#undef rtinitflags 918137628Smlaier 919137628Smlaier/* 9201541Srgrimes * Return 1 if the address might be a local broadcast address. 9211541Srgrimes */ 9221549Srgrimesint 9231541Srgrimesin_broadcast(in, ifp) 9241541Srgrimes struct in_addr in; 925133874Srwatson struct ifnet *ifp; 9261541Srgrimes{ 9271541Srgrimes register struct ifaddr *ifa; 9281541Srgrimes u_long t; 9291541Srgrimes 9301541Srgrimes if (in.s_addr == INADDR_BROADCAST || 9311541Srgrimes in.s_addr == INADDR_ANY) 9321541Srgrimes return 1; 9331541Srgrimes if ((ifp->if_flags & IFF_BROADCAST) == 0) 9341541Srgrimes return 0; 9351541Srgrimes t = ntohl(in.s_addr); 9361541Srgrimes /* 9371541Srgrimes * Look through the list of addresses for a match 9381541Srgrimes * with a broadcast address. 9391541Srgrimes */ 9401541Srgrimes#define ia ((struct in_ifaddr *)ifa) 94174362Sphk TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 9421541Srgrimes if (ifa->ifa_addr->sa_family == AF_INET && 9431541Srgrimes (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 9441541Srgrimes in.s_addr == ia->ia_netbroadcast.s_addr || 9451541Srgrimes /* 9461541Srgrimes * Check for old-style (host 0) broadcast. 9471541Srgrimes */ 94813351Sguido t == ia->ia_subnet || t == ia->ia_net) && 94913351Sguido /* 95013351Sguido * Check for an all one subnetmask. These 95113351Sguido * only exist when an interface gets a secondary 95213351Sguido * address. 95313351Sguido */ 95413351Sguido ia->ia_subnetmask != (u_long)0xffffffff) 9551541Srgrimes return 1; 9561541Srgrimes return (0); 9571541Srgrimes#undef ia 9581541Srgrimes} 9591541Srgrimes/* 9601541Srgrimes * Add an address to the list of IP multicast addresses for a given interface. 9611541Srgrimes */ 9621541Srgrimesstruct in_multi * 9631541Srgrimesin_addmulti(ap, ifp) 9641541Srgrimes register struct in_addr *ap; 9651541Srgrimes register struct ifnet *ifp; 9661541Srgrimes{ 9671541Srgrimes register struct in_multi *inm; 96821666Swollman int error; 96921666Swollman struct sockaddr_in sin; 97021666Swollman struct ifmultiaddr *ifma; 9711541Srgrimes 972148682Srwatson IN_MULTI_LOCK(); 9731541Srgrimes /* 97421666Swollman * Call generic routine to add membership or increment 97521666Swollman * refcount. It wants addresses in the form of a sockaddr, 97621666Swollman * so we build one here (being careful to zero the unused bytes). 9771541Srgrimes */ 97821666Swollman bzero(&sin, sizeof sin); 97921666Swollman sin.sin_family = AF_INET; 98021666Swollman sin.sin_len = sizeof sin; 98121666Swollman sin.sin_addr = *ap; 98221666Swollman error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 98321666Swollman if (error) { 984148682Srwatson IN_MULTI_UNLOCK(); 98521666Swollman return 0; 9861541Srgrimes } 9877280Swollman 98821666Swollman /* 98921666Swollman * If ifma->ifma_protospec is null, then if_addmulti() created 99021666Swollman * a new record. Otherwise, we are done. 99121666Swollman */ 992143881Sglebius if (ifma->ifma_protospec != NULL) { 993148682Srwatson IN_MULTI_UNLOCK(); 99421666Swollman return ifma->ifma_protospec; 99564853Sbde } 99621666Swollman 99769781Sdwmalone inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, 99869781Sdwmalone M_NOWAIT | M_ZERO); 99921666Swollman if (inm == NULL) { 1000148682Srwatson IN_MULTI_UNLOCK(); 100121666Swollman return (NULL); 10021541Srgrimes } 100321666Swollman 100421666Swollman inm->inm_addr = *ap; 100521666Swollman inm->inm_ifp = ifp; 100621666Swollman inm->inm_ifma = ifma; 100721666Swollman ifma->ifma_protospec = inm; 100821666Swollman LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 100921666Swollman 101021666Swollman /* 101121666Swollman * Let IGMP know that we have joined a new IP multicast group. 101221666Swollman */ 101321666Swollman igmp_joingroup(inm); 1014148682Srwatson IN_MULTI_UNLOCK(); 10151541Srgrimes return (inm); 10161541Srgrimes} 10171541Srgrimes 10181541Srgrimes/* 10191541Srgrimes * Delete a multicast address record. 10201541Srgrimes */ 10211549Srgrimesvoid 10221541Srgrimesin_delmulti(inm) 10231541Srgrimes register struct in_multi *inm; 10241541Srgrimes{ 1025148682Srwatson struct ifmultiaddr *ifma; 102645997Sluigi struct in_multi my_inm; 10271541Srgrimes 1028148682Srwatson IN_MULTI_LOCK(); 1029148682Srwatson ifma = inm->inm_ifma; 103045997Sluigi my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 103121666Swollman if (ifma->ifma_refcount == 1) { 10321541Srgrimes /* 10331541Srgrimes * No remaining claims to this record; let IGMP know that 10341541Srgrimes * we are leaving the multicast group. 103545997Sluigi * But do it after the if_delmulti() which might reset 103645997Sluigi * the interface and nuke the packet. 10371541Srgrimes */ 103845997Sluigi my_inm = *inm ; 1039143881Sglebius ifma->ifma_protospec = NULL; 104021666Swollman LIST_REMOVE(inm, inm_link); 10411541Srgrimes free(inm, M_IPMADDR); 10421541Srgrimes } 104321666Swollman /* XXX - should be separate API for when we have an ifma? */ 104421666Swollman if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 104545997Sluigi if (my_inm.inm_ifp != NULL) 104645997Sluigi igmp_leavegroup(&my_inm); 1047148682Srwatson IN_MULTI_UNLOCK(); 10481541Srgrimes} 1049