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unneback |
/*
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)in.c 8.4 (Berkeley) 1/9/95
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* $Id: in.c,v 1.2 2001-09-27 12:01:55 chris Exp $
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*/
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/systm.h>
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#include <sys/ioctl.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/if_ether.h>
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#include <netinet/igmp_var.h>
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/*
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* This structure is used to keep track of in_multi chains which belong to
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* deleted interface addresses.
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*/
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static LIST_HEAD(, multi_kludge) in_mk; /* XXX BSS initialization */
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struct multi_kludge {
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LIST_ENTRY(multi_kludge) mk_entry;
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struct ifnet *mk_ifp;
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struct in_multihead mk_head;
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};
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static void in_socktrim __P((struct sockaddr_in *));
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static int in_ifinit __P((struct ifnet *,
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struct in_ifaddr *, struct sockaddr_in *, int));
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static void in_ifscrub __P((struct ifnet *, struct in_ifaddr *));
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static int subnetsarelocal = 0;
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SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
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&subnetsarelocal, 0, "");
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/*
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* Return 1 if an internet address is for a ``local'' host
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* (one to which we have a connection). If subnetsarelocal
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* is true, this includes other subnets of the local net.
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* Otherwise, it includes only the directly-connected (sub)nets.
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*/
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int
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in_localaddr(in)
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struct in_addr in;
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{
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register u_long i = ntohl(in.s_addr);
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register struct in_ifaddr *ia;
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if (subnetsarelocal) {
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for (ia = in_ifaddr; ia; ia = ia->ia_next)
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if ((i & ia->ia_netmask) == ia->ia_net)
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return (1);
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} else {
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for (ia = in_ifaddr; ia; ia = ia->ia_next)
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if ((i & ia->ia_subnetmask) == ia->ia_subnet)
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return (1);
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}
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return (0);
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}
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/*
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* Determine whether an IP address is in a reserved set of addresses
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* that may not be forwarded, or whether datagrams to that destination
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* may be forwarded.
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*/
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int
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in_canforward(in)
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struct in_addr in;
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{
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register u_long i = ntohl(in.s_addr);
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register u_long net;
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if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
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return (0);
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if (IN_CLASSA(i)) {
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net = i & IN_CLASSA_NET;
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if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
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return (0);
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}
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return (1);
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}
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/*
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* Trim a mask in a sockaddr
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*/
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static void
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in_socktrim(ap)
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struct sockaddr_in *ap;
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{
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register char *cplim = (char *) &ap->sin_addr;
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register char *cp = (char *) (&ap->sin_addr + 1);
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ap->sin_len = 0;
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while (--cp >= cplim)
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if (*cp) {
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(ap)->sin_len = cp - (char *) (ap) + 1;
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break;
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}
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}
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static int in_interfaces; /* number of external internet interfaces */
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/*
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* Generic internet control operations (ioctl's).
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* Ifp is 0 if not an interface-specific ioctl.
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*/
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/* ARGSUSED */
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int
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in_control(so, cmd, data, ifp)
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struct socket *so;
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u_long cmd;
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caddr_t data;
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register struct ifnet *ifp;
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{
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register struct ifreq *ifr = (struct ifreq *)data;
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register struct in_ifaddr *ia = 0, *iap;
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register struct ifaddr *ifa;
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struct in_ifaddr *oia;
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struct in_aliasreq *ifra = (struct in_aliasreq *)data;
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struct sockaddr_in oldaddr;
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int error, hostIsNew, maskIsNew, s;
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u_long i;
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struct multi_kludge *mk;
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/*
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* Find address for this interface, if it exists.
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*
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* If an alias address was specified, find that one instead of
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* the first one on the interface.
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*/
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if (ifp)
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for (iap = in_ifaddr; iap; iap = iap->ia_next)
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if (iap->ia_ifp == ifp) {
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if (((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr.s_addr ==
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iap->ia_addr.sin_addr.s_addr) {
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ia = iap;
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break;
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} else if (ia == NULL) {
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ia = iap;
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if (ifr->ifr_addr.sa_family != AF_INET)
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break;
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}
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}
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switch (cmd) {
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case SIOCAIFADDR:
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case SIOCDIFADDR:
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if (ifra->ifra_addr.sin_family == AF_INET) {
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| 192 |
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for (oia = ia; ia; ia = ia->ia_next) {
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| 193 |
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if (ia->ia_ifp == ifp &&
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| 194 |
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ia->ia_addr.sin_addr.s_addr ==
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| 195 |
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ifra->ifra_addr.sin_addr.s_addr)
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break;
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}
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| 198 |
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if ((ifp->if_flags & IFF_POINTOPOINT)
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&& (cmd == SIOCAIFADDR)
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&& (ifra->ifra_dstaddr.sin_addr.s_addr
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== INADDR_ANY)) {
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return EDESTADDRREQ;
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}
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| 204 |
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}
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| 205 |
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if (cmd == SIOCDIFADDR && ia == 0)
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return (EADDRNOTAVAIL);
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/* FALLTHROUGH */
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case SIOCSIFADDR:
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case SIOCSIFNETMASK:
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case SIOCSIFDSTADDR:
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if ((so->so_state & SS_PRIV) == 0)
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return (EPERM);
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if (ifp == 0)
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panic("in_control");
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if (ia == (struct in_ifaddr *)0) {
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oia = (struct in_ifaddr *)
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malloc(sizeof *oia, M_IFADDR, M_WAITOK);
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| 219 |
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if (oia == (struct in_ifaddr *)NULL)
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return (ENOBUFS);
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bzero((caddr_t)oia, sizeof *oia);
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ia = in_ifaddr;
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/*
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| 224 |
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* Protect from ipintr() traversing address list
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| 225 |
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* while we're modifying it.
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*/
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s = splnet();
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| 228 |
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| 229 |
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if (ia) {
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| 230 |
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for ( ; ia->ia_next; ia = ia->ia_next)
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| 231 |
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continue;
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| 232 |
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ia->ia_next = oia;
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| 233 |
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} else
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| 234 |
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in_ifaddr = oia;
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| 235 |
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ia = oia;
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| 236 |
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ifa = ifp->if_addrlist;
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| 237 |
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if (ifa) {
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| 238 |
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for ( ; ifa->ifa_next; ifa = ifa->ifa_next)
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| 239 |
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continue;
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| 240 |
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ifa->ifa_next = (struct ifaddr *) ia;
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| 241 |
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} else
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| 242 |
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ifp->if_addrlist = (struct ifaddr *) ia;
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| 243 |
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ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
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| 244 |
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ia->ia_ifa.ifa_dstaddr
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| 245 |
|
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= (struct sockaddr *)&ia->ia_dstaddr;
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| 246 |
|
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ia->ia_ifa.ifa_netmask
|
| 247 |
|
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= (struct sockaddr *)&ia->ia_sockmask;
|
| 248 |
|
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ia->ia_sockmask.sin_len = 8;
|
| 249 |
|
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if (ifp->if_flags & IFF_BROADCAST) {
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| 250 |
|
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ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
|
| 251 |
|
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ia->ia_broadaddr.sin_family = AF_INET;
|
| 252 |
|
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}
|
| 253 |
|
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ia->ia_ifp = ifp;
|
| 254 |
|
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if (!(ifp->if_flags & IFF_LOOPBACK))
|
| 255 |
|
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in_interfaces++;
|
| 256 |
|
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splx(s);
|
| 257 |
|
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}
|
| 258 |
|
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break;
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| 259 |
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|
|
| 260 |
|
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case SIOCSIFBRDADDR:
|
| 261 |
|
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if ((so->so_state & SS_PRIV) == 0)
|
| 262 |
|
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return (EPERM);
|
| 263 |
|
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/* FALLTHROUGH */
|
| 264 |
|
|
|
| 265 |
|
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case SIOCGIFADDR:
|
| 266 |
|
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case SIOCGIFNETMASK:
|
| 267 |
|
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case SIOCGIFDSTADDR:
|
| 268 |
|
|
case SIOCGIFBRDADDR:
|
| 269 |
|
|
if (ia == (struct in_ifaddr *)0)
|
| 270 |
|
|
return (EADDRNOTAVAIL);
|
| 271 |
|
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break;
|
| 272 |
|
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}
|
| 273 |
|
|
switch (cmd) {
|
| 274 |
|
|
|
| 275 |
|
|
case SIOCGIFADDR:
|
| 276 |
|
|
*((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
|
| 277 |
|
|
break;
|
| 278 |
|
|
|
| 279 |
|
|
case SIOCGIFBRDADDR:
|
| 280 |
|
|
if ((ifp->if_flags & IFF_BROADCAST) == 0)
|
| 281 |
|
|
return (EINVAL);
|
| 282 |
|
|
*((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
|
| 283 |
|
|
break;
|
| 284 |
|
|
|
| 285 |
|
|
case SIOCGIFDSTADDR:
|
| 286 |
|
|
if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
|
| 287 |
|
|
return (EINVAL);
|
| 288 |
|
|
*((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
|
| 289 |
|
|
break;
|
| 290 |
|
|
|
| 291 |
|
|
case SIOCGIFNETMASK:
|
| 292 |
|
|
*((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
|
| 293 |
|
|
break;
|
| 294 |
|
|
|
| 295 |
|
|
case SIOCSIFDSTADDR:
|
| 296 |
|
|
if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
|
| 297 |
|
|
return (EINVAL);
|
| 298 |
|
|
oldaddr = ia->ia_dstaddr;
|
| 299 |
|
|
ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
|
| 300 |
|
|
if (ifp->if_ioctl && (error = (*ifp->if_ioctl)
|
| 301 |
|
|
(ifp, SIOCSIFDSTADDR, (caddr_t)ia))) {
|
| 302 |
|
|
ia->ia_dstaddr = oldaddr;
|
| 303 |
|
|
return (error);
|
| 304 |
|
|
}
|
| 305 |
|
|
if (ia->ia_flags & IFA_ROUTE) {
|
| 306 |
|
|
ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
|
| 307 |
|
|
rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
|
| 308 |
|
|
ia->ia_ifa.ifa_dstaddr =
|
| 309 |
|
|
(struct sockaddr *)&ia->ia_dstaddr;
|
| 310 |
|
|
rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
|
| 311 |
|
|
}
|
| 312 |
|
|
break;
|
| 313 |
|
|
|
| 314 |
|
|
case SIOCSIFBRDADDR:
|
| 315 |
|
|
if ((ifp->if_flags & IFF_BROADCAST) == 0)
|
| 316 |
|
|
return (EINVAL);
|
| 317 |
|
|
ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
|
| 318 |
|
|
break;
|
| 319 |
|
|
|
| 320 |
|
|
case SIOCSIFADDR:
|
| 321 |
|
|
return (in_ifinit(ifp, ia,
|
| 322 |
|
|
(struct sockaddr_in *) &ifr->ifr_addr, 1));
|
| 323 |
|
|
|
| 324 |
|
|
case SIOCSIFNETMASK:
|
| 325 |
|
|
i = ifra->ifra_addr.sin_addr.s_addr;
|
| 326 |
|
|
ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr = i);
|
| 327 |
|
|
break;
|
| 328 |
|
|
|
| 329 |
|
|
case SIOCAIFADDR:
|
| 330 |
|
|
maskIsNew = 0;
|
| 331 |
|
|
hostIsNew = 1;
|
| 332 |
|
|
error = 0;
|
| 333 |
|
|
if (ia->ia_addr.sin_family == AF_INET) {
|
| 334 |
|
|
if (ifra->ifra_addr.sin_len == 0) {
|
| 335 |
|
|
ifra->ifra_addr = ia->ia_addr;
|
| 336 |
|
|
hostIsNew = 0;
|
| 337 |
|
|
} else if (ifra->ifra_addr.sin_addr.s_addr ==
|
| 338 |
|
|
ia->ia_addr.sin_addr.s_addr)
|
| 339 |
|
|
hostIsNew = 0;
|
| 340 |
|
|
}
|
| 341 |
|
|
if (ifra->ifra_mask.sin_len) {
|
| 342 |
|
|
in_ifscrub(ifp, ia);
|
| 343 |
|
|
ia->ia_sockmask = ifra->ifra_mask;
|
| 344 |
|
|
ia->ia_subnetmask =
|
| 345 |
|
|
ntohl(ia->ia_sockmask.sin_addr.s_addr);
|
| 346 |
|
|
maskIsNew = 1;
|
| 347 |
|
|
}
|
| 348 |
|
|
if ((ifp->if_flags & IFF_POINTOPOINT) &&
|
| 349 |
|
|
(ifra->ifra_dstaddr.sin_family == AF_INET)) {
|
| 350 |
|
|
in_ifscrub(ifp, ia);
|
| 351 |
|
|
ia->ia_dstaddr = ifra->ifra_dstaddr;
|
| 352 |
|
|
maskIsNew = 1; /* We lie; but the effect's the same */
|
| 353 |
|
|
}
|
| 354 |
|
|
if (ifra->ifra_addr.sin_family == AF_INET &&
|
| 355 |
|
|
(hostIsNew || maskIsNew))
|
| 356 |
|
|
error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
|
| 357 |
|
|
if ((ifp->if_flags & IFF_BROADCAST) &&
|
| 358 |
|
|
(ifra->ifra_broadaddr.sin_family == AF_INET))
|
| 359 |
|
|
ia->ia_broadaddr = ifra->ifra_broadaddr;
|
| 360 |
|
|
return (error);
|
| 361 |
|
|
|
| 362 |
|
|
case SIOCDIFADDR:
|
| 363 |
|
|
mk = malloc(sizeof *mk, M_IPMADDR, M_WAITOK);
|
| 364 |
|
|
if (!mk)
|
| 365 |
|
|
return ENOBUFS;
|
| 366 |
|
|
|
| 367 |
|
|
in_ifscrub(ifp, ia);
|
| 368 |
|
|
/*
|
| 369 |
|
|
* Protect from ipintr() traversing address list
|
| 370 |
|
|
* while we're modifying it.
|
| 371 |
|
|
*/
|
| 372 |
|
|
s = splnet();
|
| 373 |
|
|
|
| 374 |
|
|
if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia)
|
| 375 |
|
|
ifp->if_addrlist = ifa->ifa_next;
|
| 376 |
|
|
else {
|
| 377 |
|
|
while (ifa->ifa_next &&
|
| 378 |
|
|
(ifa->ifa_next != (struct ifaddr *)ia))
|
| 379 |
|
|
ifa = ifa->ifa_next;
|
| 380 |
|
|
if (ifa->ifa_next)
|
| 381 |
|
|
ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next;
|
| 382 |
|
|
else
|
| 383 |
|
|
printf("Couldn't unlink inifaddr from ifp\n");
|
| 384 |
|
|
}
|
| 385 |
|
|
oia = ia;
|
| 386 |
|
|
if (oia == (ia = in_ifaddr))
|
| 387 |
|
|
in_ifaddr = ia->ia_next;
|
| 388 |
|
|
else {
|
| 389 |
|
|
while (ia->ia_next && (ia->ia_next != oia))
|
| 390 |
|
|
ia = ia->ia_next;
|
| 391 |
|
|
if (ia->ia_next)
|
| 392 |
|
|
ia->ia_next = oia->ia_next;
|
| 393 |
|
|
else
|
| 394 |
|
|
printf("Didn't unlink inifadr from list\n");
|
| 395 |
|
|
}
|
| 396 |
|
|
|
| 397 |
|
|
if (!oia->ia_multiaddrs.lh_first) {
|
| 398 |
|
|
IFAFREE(&oia->ia_ifa);
|
| 399 |
|
|
FREE(mk, M_IPMADDR);
|
| 400 |
|
|
splx(s);
|
| 401 |
|
|
break;
|
| 402 |
|
|
}
|
| 403 |
|
|
|
| 404 |
|
|
/*
|
| 405 |
|
|
* Multicast address kludge:
|
| 406 |
|
|
* If there were any multicast addresses attached to this
|
| 407 |
|
|
* interface address, either move them to another address
|
| 408 |
|
|
* on this interface, or save them until such time as this
|
| 409 |
|
|
* interface is reconfigured for IP.
|
| 410 |
|
|
*/
|
| 411 |
|
|
IFP_TO_IA(oia->ia_ifp, ia);
|
| 412 |
|
|
if (ia) { /* there is another address */
|
| 413 |
|
|
struct in_multi *inm;
|
| 414 |
|
|
for(inm = oia->ia_multiaddrs.lh_first; inm;
|
| 415 |
|
|
inm = inm->inm_entry.le_next) {
|
| 416 |
|
|
IFAFREE(&inm->inm_ia->ia_ifa);
|
| 417 |
|
|
ia->ia_ifa.ifa_refcnt++;
|
| 418 |
|
|
inm->inm_ia = ia;
|
| 419 |
|
|
LIST_INSERT_HEAD(&ia->ia_multiaddrs, inm,
|
| 420 |
|
|
inm_entry);
|
| 421 |
|
|
}
|
| 422 |
|
|
FREE(mk, M_IPMADDR);
|
| 423 |
|
|
} else { /* last address on this if deleted, save */
|
| 424 |
|
|
struct in_multi *inm;
|
| 425 |
|
|
|
| 426 |
|
|
LIST_INIT(&mk->mk_head);
|
| 427 |
|
|
mk->mk_ifp = ifp;
|
| 428 |
|
|
|
| 429 |
|
|
for(inm = oia->ia_multiaddrs.lh_first; inm;
|
| 430 |
|
|
inm = inm->inm_entry.le_next) {
|
| 431 |
|
|
LIST_INSERT_HEAD(&mk->mk_head, inm, inm_entry);
|
| 432 |
|
|
}
|
| 433 |
|
|
|
| 434 |
|
|
if (mk->mk_head.lh_first) {
|
| 435 |
|
|
LIST_INSERT_HEAD(&in_mk, mk, mk_entry);
|
| 436 |
|
|
} else {
|
| 437 |
|
|
FREE(mk, M_IPMADDR);
|
| 438 |
|
|
}
|
| 439 |
|
|
}
|
| 440 |
|
|
|
| 441 |
|
|
IFAFREE((&oia->ia_ifa));
|
| 442 |
|
|
splx(s);
|
| 443 |
|
|
break;
|
| 444 |
|
|
|
| 445 |
|
|
default:
|
| 446 |
|
|
if (ifp == 0 || ifp->if_ioctl == 0)
|
| 447 |
|
|
return (EOPNOTSUPP);
|
| 448 |
|
|
return ((*ifp->if_ioctl)(ifp, cmd, data));
|
| 449 |
|
|
}
|
| 450 |
|
|
return (0);
|
| 451 |
|
|
}
|
| 452 |
|
|
|
| 453 |
|
|
/*
|
| 454 |
|
|
* Delete any existing route for an interface.
|
| 455 |
|
|
*/
|
| 456 |
|
|
static void
|
| 457 |
|
|
in_ifscrub(ifp, ia)
|
| 458 |
|
|
register struct ifnet *ifp;
|
| 459 |
|
|
register struct in_ifaddr *ia;
|
| 460 |
|
|
{
|
| 461 |
|
|
|
| 462 |
|
|
if ((ia->ia_flags & IFA_ROUTE) == 0)
|
| 463 |
|
|
return;
|
| 464 |
|
|
if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
|
| 465 |
|
|
rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
|
| 466 |
|
|
else
|
| 467 |
|
|
rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
|
| 468 |
|
|
ia->ia_flags &= ~IFA_ROUTE;
|
| 469 |
|
|
}
|
| 470 |
|
|
|
| 471 |
|
|
/*
|
| 472 |
|
|
* Initialize an interface's internet address
|
| 473 |
|
|
* and routing table entry.
|
| 474 |
|
|
*/
|
| 475 |
|
|
static int
|
| 476 |
|
|
in_ifinit(ifp, ia, sin, scrub)
|
| 477 |
|
|
register struct ifnet *ifp;
|
| 478 |
|
|
register struct in_ifaddr *ia;
|
| 479 |
|
|
struct sockaddr_in *sin;
|
| 480 |
|
|
int scrub;
|
| 481 |
|
|
{
|
| 482 |
|
|
register u_long i = ntohl(sin->sin_addr.s_addr);
|
| 483 |
|
|
struct sockaddr_in oldaddr;
|
| 484 |
|
|
int s = splimp(), flags = RTF_UP, error;
|
| 485 |
|
|
struct multi_kludge *mk;
|
| 486 |
|
|
|
| 487 |
|
|
oldaddr = ia->ia_addr;
|
| 488 |
|
|
ia->ia_addr = *sin;
|
| 489 |
|
|
/*
|
| 490 |
|
|
* Give the interface a chance to initialize
|
| 491 |
|
|
* if this is its first address,
|
| 492 |
|
|
* and to validate the address if necessary.
|
| 493 |
|
|
*/
|
| 494 |
|
|
if (ifp->if_ioctl &&
|
| 495 |
|
|
(error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
|
| 496 |
|
|
splx(s);
|
| 497 |
|
|
ia->ia_addr = oldaddr;
|
| 498 |
|
|
return (error);
|
| 499 |
|
|
}
|
| 500 |
|
|
splx(s);
|
| 501 |
|
|
if (scrub) {
|
| 502 |
|
|
ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
|
| 503 |
|
|
in_ifscrub(ifp, ia);
|
| 504 |
|
|
ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
|
| 505 |
|
|
}
|
| 506 |
|
|
if (IN_CLASSA(i))
|
| 507 |
|
|
ia->ia_netmask = IN_CLASSA_NET;
|
| 508 |
|
|
else if (IN_CLASSB(i))
|
| 509 |
|
|
ia->ia_netmask = IN_CLASSB_NET;
|
| 510 |
|
|
else
|
| 511 |
|
|
ia->ia_netmask = IN_CLASSC_NET;
|
| 512 |
|
|
/*
|
| 513 |
|
|
* The subnet mask usually includes at least the standard network part,
|
| 514 |
|
|
* but may may be smaller in the case of supernetting.
|
| 515 |
|
|
* If it is set, we believe it.
|
| 516 |
|
|
*/
|
| 517 |
|
|
if (ia->ia_subnetmask == 0) {
|
| 518 |
|
|
ia->ia_subnetmask = ia->ia_netmask;
|
| 519 |
|
|
ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
|
| 520 |
|
|
} else
|
| 521 |
|
|
ia->ia_netmask &= ia->ia_subnetmask;
|
| 522 |
|
|
ia->ia_net = i & ia->ia_netmask;
|
| 523 |
|
|
ia->ia_subnet = i & ia->ia_subnetmask;
|
| 524 |
|
|
in_socktrim(&ia->ia_sockmask);
|
| 525 |
|
|
/*
|
| 526 |
|
|
* Add route for the network.
|
| 527 |
|
|
*/
|
| 528 |
|
|
ia->ia_ifa.ifa_metric = ifp->if_metric;
|
| 529 |
|
|
if (ifp->if_flags & IFF_BROADCAST) {
|
| 530 |
|
|
ia->ia_broadaddr.sin_addr.s_addr =
|
| 531 |
|
|
htonl(ia->ia_subnet | ~ia->ia_subnetmask);
|
| 532 |
|
|
ia->ia_netbroadcast.s_addr =
|
| 533 |
|
|
htonl(ia->ia_net | ~ ia->ia_netmask);
|
| 534 |
|
|
} else if (ifp->if_flags & IFF_LOOPBACK) {
|
| 535 |
|
|
ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
|
| 536 |
|
|
flags |= RTF_HOST;
|
| 537 |
|
|
} else if (ifp->if_flags & IFF_POINTOPOINT) {
|
| 538 |
|
|
if (ia->ia_dstaddr.sin_family != AF_INET)
|
| 539 |
|
|
return (0);
|
| 540 |
|
|
flags |= RTF_HOST;
|
| 541 |
|
|
}
|
| 542 |
|
|
if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0)
|
| 543 |
|
|
ia->ia_flags |= IFA_ROUTE;
|
| 544 |
|
|
|
| 545 |
|
|
LIST_INIT(&ia->ia_multiaddrs);
|
| 546 |
|
|
/*
|
| 547 |
|
|
* If the interface supports multicast, join the "all hosts"
|
| 548 |
|
|
* multicast group on that interface.
|
| 549 |
|
|
*/
|
| 550 |
|
|
if (ifp->if_flags & IFF_MULTICAST) {
|
| 551 |
|
|
struct in_addr addr;
|
| 552 |
|
|
|
| 553 |
|
|
/*
|
| 554 |
|
|
* Continuation of multicast address hack:
|
| 555 |
|
|
* If there was a multicast group list previously saved
|
| 556 |
|
|
* for this interface, then we re-attach it to the first
|
| 557 |
|
|
* address configured on the i/f.
|
| 558 |
|
|
*/
|
| 559 |
|
|
for(mk = in_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
|
| 560 |
|
|
if(mk->mk_ifp == ifp) {
|
| 561 |
|
|
struct in_multi *inm;
|
| 562 |
|
|
|
| 563 |
|
|
for(inm = mk->mk_head.lh_first; inm;
|
| 564 |
|
|
inm = inm->inm_entry.le_next) {
|
| 565 |
|
|
IFAFREE(&inm->inm_ia->ia_ifa);
|
| 566 |
|
|
ia->ia_ifa.ifa_refcnt++;
|
| 567 |
|
|
inm->inm_ia = ia;
|
| 568 |
|
|
LIST_INSERT_HEAD(&ia->ia_multiaddrs,
|
| 569 |
|
|
inm, inm_entry);
|
| 570 |
|
|
}
|
| 571 |
|
|
LIST_REMOVE(mk, mk_entry);
|
| 572 |
|
|
free(mk, M_IPMADDR);
|
| 573 |
|
|
break;
|
| 574 |
|
|
}
|
| 575 |
|
|
}
|
| 576 |
|
|
|
| 577 |
|
|
addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
|
| 578 |
|
|
in_addmulti(&addr, ifp);
|
| 579 |
|
|
}
|
| 580 |
|
|
return (error);
|
| 581 |
|
|
}
|
| 582 |
|
|
|
| 583 |
|
|
|
| 584 |
|
|
/*
|
| 585 |
|
|
* Return 1 if the address might be a local broadcast address.
|
| 586 |
|
|
*/
|
| 587 |
|
|
int
|
| 588 |
|
|
in_broadcast(in, ifp)
|
| 589 |
|
|
struct in_addr in;
|
| 590 |
|
|
struct ifnet *ifp;
|
| 591 |
|
|
{
|
| 592 |
|
|
register struct ifaddr *ifa;
|
| 593 |
|
|
u_long t;
|
| 594 |
|
|
|
| 595 |
|
|
if (in.s_addr == INADDR_BROADCAST ||
|
| 596 |
|
|
in.s_addr == INADDR_ANY)
|
| 597 |
|
|
return 1;
|
| 598 |
|
|
if ((ifp->if_flags & IFF_BROADCAST) == 0)
|
| 599 |
|
|
return 0;
|
| 600 |
|
|
t = ntohl(in.s_addr);
|
| 601 |
|
|
/*
|
| 602 |
|
|
* Look through the list of addresses for a match
|
| 603 |
|
|
* with a broadcast address.
|
| 604 |
|
|
*/
|
| 605 |
|
|
#define ia ((struct in_ifaddr *)ifa)
|
| 606 |
|
|
for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
|
| 607 |
|
|
if (ifa->ifa_addr->sa_family == AF_INET &&
|
| 608 |
|
|
(in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
|
| 609 |
|
|
in.s_addr == ia->ia_netbroadcast.s_addr ||
|
| 610 |
|
|
/*
|
| 611 |
|
|
* Check for old-style (host 0) broadcast.
|
| 612 |
|
|
*/
|
| 613 |
|
|
t == ia->ia_subnet || t == ia->ia_net) &&
|
| 614 |
|
|
/*
|
| 615 |
|
|
* Check for an all one subnetmask. These
|
| 616 |
|
|
* only exist when an interface gets a secondary
|
| 617 |
|
|
* address.
|
| 618 |
|
|
*/
|
| 619 |
|
|
ia->ia_subnetmask != (u_long)0xffffffff)
|
| 620 |
|
|
return 1;
|
| 621 |
|
|
return (0);
|
| 622 |
|
|
#undef ia
|
| 623 |
|
|
}
|
| 624 |
|
|
/*
|
| 625 |
|
|
* Add an address to the list of IP multicast addresses for a given interface.
|
| 626 |
|
|
*/
|
| 627 |
|
|
struct in_multi *
|
| 628 |
|
|
in_addmulti(ap, ifp)
|
| 629 |
|
|
register struct in_addr *ap;
|
| 630 |
|
|
register struct ifnet *ifp;
|
| 631 |
|
|
{
|
| 632 |
|
|
register struct in_multi *inm;
|
| 633 |
|
|
struct ifreq ifr;
|
| 634 |
|
|
struct in_ifaddr *ia;
|
| 635 |
|
|
int s = splnet();
|
| 636 |
|
|
|
| 637 |
|
|
/*
|
| 638 |
|
|
* See if address already in list.
|
| 639 |
|
|
*/
|
| 640 |
|
|
IN_LOOKUP_MULTI(*ap, ifp, inm);
|
| 641 |
|
|
if (inm != NULL) {
|
| 642 |
|
|
/*
|
| 643 |
|
|
* Found it; just increment the reference count.
|
| 644 |
|
|
*/
|
| 645 |
|
|
++inm->inm_refcount;
|
| 646 |
|
|
}
|
| 647 |
|
|
else {
|
| 648 |
|
|
/*
|
| 649 |
|
|
* New address; allocate a new multicast record
|
| 650 |
|
|
* and link it into the interface's multicast list.
|
| 651 |
|
|
*/
|
| 652 |
|
|
inm = (struct in_multi *)malloc(sizeof(*inm),
|
| 653 |
|
|
M_IPMADDR, M_NOWAIT);
|
| 654 |
|
|
if (inm == NULL) {
|
| 655 |
|
|
splx(s);
|
| 656 |
|
|
return (NULL);
|
| 657 |
|
|
}
|
| 658 |
|
|
inm->inm_addr = *ap;
|
| 659 |
|
|
inm->inm_ifp = ifp;
|
| 660 |
|
|
inm->inm_refcount = 1;
|
| 661 |
|
|
IFP_TO_IA(ifp, ia);
|
| 662 |
|
|
if (ia == NULL) {
|
| 663 |
|
|
free(inm, M_IPMADDR);
|
| 664 |
|
|
splx(s);
|
| 665 |
|
|
return (NULL);
|
| 666 |
|
|
}
|
| 667 |
|
|
inm->inm_ia = ia;
|
| 668 |
|
|
ia->ia_ifa.ifa_refcnt++; /* gain a reference */
|
| 669 |
|
|
LIST_INSERT_HEAD(&ia->ia_multiaddrs, inm, inm_entry);
|
| 670 |
|
|
|
| 671 |
|
|
/*
|
| 672 |
|
|
* Ask the network driver to update its multicast reception
|
| 673 |
|
|
* filter appropriately for the new address.
|
| 674 |
|
|
*/
|
| 675 |
|
|
((struct sockaddr_in *)&ifr.ifr_addr)->sin_family = AF_INET;
|
| 676 |
|
|
((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr = *ap;
|
| 677 |
|
|
if ((ifp->if_ioctl == NULL) ||
|
| 678 |
|
|
(*ifp->if_ioctl)(ifp, SIOCADDMULTI,(caddr_t)&ifr) != 0) {
|
| 679 |
|
|
LIST_REMOVE(inm, inm_entry);
|
| 680 |
|
|
IFAFREE(&ia->ia_ifa); /* release reference */
|
| 681 |
|
|
free(inm, M_IPMADDR);
|
| 682 |
|
|
splx(s);
|
| 683 |
|
|
return (NULL);
|
| 684 |
|
|
}
|
| 685 |
|
|
/*
|
| 686 |
|
|
* Let IGMP know that we have joined a new IP multicast group.
|
| 687 |
|
|
*/
|
| 688 |
|
|
igmp_joingroup(inm);
|
| 689 |
|
|
}
|
| 690 |
|
|
splx(s);
|
| 691 |
|
|
return (inm);
|
| 692 |
|
|
}
|
| 693 |
|
|
|
| 694 |
|
|
/*
|
| 695 |
|
|
* Delete a multicast address record.
|
| 696 |
|
|
*/
|
| 697 |
|
|
void
|
| 698 |
|
|
in_delmulti(inm)
|
| 699 |
|
|
register struct in_multi *inm;
|
| 700 |
|
|
{
|
| 701 |
|
|
struct ifreq ifr;
|
| 702 |
|
|
int s = splnet();
|
| 703 |
|
|
|
| 704 |
|
|
if (--inm->inm_refcount == 0) {
|
| 705 |
|
|
/*
|
| 706 |
|
|
* No remaining claims to this record; let IGMP know that
|
| 707 |
|
|
* we are leaving the multicast group.
|
| 708 |
|
|
*/
|
| 709 |
|
|
igmp_leavegroup(inm);
|
| 710 |
|
|
/*
|
| 711 |
|
|
* Unlink from list.
|
| 712 |
|
|
*/
|
| 713 |
|
|
LIST_REMOVE(inm, inm_entry);
|
| 714 |
|
|
IFAFREE(&inm->inm_ia->ia_ifa); /* release reference */
|
| 715 |
|
|
|
| 716 |
|
|
/*
|
| 717 |
|
|
* Notify the network driver to update its multicast reception
|
| 718 |
|
|
* filter.
|
| 719 |
|
|
*/
|
| 720 |
|
|
((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET;
|
| 721 |
|
|
((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr =
|
| 722 |
|
|
inm->inm_addr;
|
| 723 |
|
|
(*inm->inm_ifp->if_ioctl)(inm->inm_ifp, SIOCDELMULTI,
|
| 724 |
|
|
(caddr_t)&ifr);
|
| 725 |
|
|
free(inm, M_IPMADDR);
|
| 726 |
|
|
}
|
| 727 |
|
|
splx(s);
|
| 728 |
|
|
}
|
