594 lines
16 KiB
C
594 lines
16 KiB
C
/*
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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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* $Id$
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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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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 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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struct in_multihead in_multihead; /* XXX BSS initialization */
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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_ifaddrhead.tqh_first; ia;
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ia = ia->ia_link.tqe_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_ifaddrhead.tqh_first; ia;
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ia = ia->ia_link.tqe_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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int 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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/*
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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_ifaddrhead.tqh_first; iap;
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iap = iap->ia_link.tqe_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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for (oia = ia; ia; ia = ia->ia_link.tqe_next) {
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if (ia->ia_ifp == ifp &&
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ia->ia_addr.sin_addr.s_addr ==
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ifra->ifra_addr.sin_addr.s_addr)
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break;
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}
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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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}
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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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ia = (struct in_ifaddr *)
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malloc(sizeof *ia, M_IFADDR, M_WAITOK);
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if (ia == (struct in_ifaddr *)NULL)
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return (ENOBUFS);
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bzero((caddr_t)ia, sizeof *ia);
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/*
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* Protect from ipintr() traversing address list
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* while we're modifying it.
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*/
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s = splnet();
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TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link);
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ifa = &ia->ia_ifa;
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TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
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ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
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ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
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ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
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ia->ia_sockmask.sin_len = 8;
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if (ifp->if_flags & IFF_BROADCAST) {
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ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
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ia->ia_broadaddr.sin_family = AF_INET;
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}
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ia->ia_ifp = ifp;
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if (!(ifp->if_flags & IFF_LOOPBACK))
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in_interfaces++;
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splx(s);
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}
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break;
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case SIOCSIFBRDADDR:
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if ((so->so_state & SS_PRIV) == 0)
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return (EPERM);
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/* FALLTHROUGH */
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case SIOCGIFADDR:
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case SIOCGIFNETMASK:
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case SIOCGIFDSTADDR:
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case SIOCGIFBRDADDR:
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if (ia == (struct in_ifaddr *)0)
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return (EADDRNOTAVAIL);
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break;
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}
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switch (cmd) {
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case SIOCGIFADDR:
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*((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
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break;
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case SIOCGIFBRDADDR:
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if ((ifp->if_flags & IFF_BROADCAST) == 0)
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return (EINVAL);
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*((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
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break;
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case SIOCGIFDSTADDR:
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if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
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return (EINVAL);
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*((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
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break;
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case SIOCGIFNETMASK:
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*((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
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break;
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case SIOCSIFDSTADDR:
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if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
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return (EINVAL);
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oldaddr = ia->ia_dstaddr;
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ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
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if (ifp->if_ioctl && (error = (*ifp->if_ioctl)
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(ifp, SIOCSIFDSTADDR, (caddr_t)ia))) {
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ia->ia_dstaddr = oldaddr;
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return (error);
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}
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if (ia->ia_flags & IFA_ROUTE) {
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ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
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rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
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ia->ia_ifa.ifa_dstaddr =
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(struct sockaddr *)&ia->ia_dstaddr;
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rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
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}
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break;
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case SIOCSIFBRDADDR:
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if ((ifp->if_flags & IFF_BROADCAST) == 0)
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return (EINVAL);
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ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
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break;
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case SIOCSIFADDR:
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return (in_ifinit(ifp, ia,
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(struct sockaddr_in *) &ifr->ifr_addr, 1));
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case SIOCSIFNETMASK:
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i = ifra->ifra_addr.sin_addr.s_addr;
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ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr = i);
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break;
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case SIOCAIFADDR:
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maskIsNew = 0;
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hostIsNew = 1;
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error = 0;
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if (ia->ia_addr.sin_family == AF_INET) {
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if (ifra->ifra_addr.sin_len == 0) {
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ifra->ifra_addr = ia->ia_addr;
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hostIsNew = 0;
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} else if (ifra->ifra_addr.sin_addr.s_addr ==
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ia->ia_addr.sin_addr.s_addr)
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hostIsNew = 0;
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}
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if (ifra->ifra_mask.sin_len) {
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in_ifscrub(ifp, ia);
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ia->ia_sockmask = ifra->ifra_mask;
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ia->ia_subnetmask =
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ntohl(ia->ia_sockmask.sin_addr.s_addr);
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maskIsNew = 1;
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}
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if ((ifp->if_flags & IFF_POINTOPOINT) &&
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(ifra->ifra_dstaddr.sin_family == AF_INET)) {
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in_ifscrub(ifp, ia);
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ia->ia_dstaddr = ifra->ifra_dstaddr;
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maskIsNew = 1; /* We lie; but the effect's the same */
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}
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if (ifra->ifra_addr.sin_family == AF_INET &&
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(hostIsNew || maskIsNew))
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error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
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if ((ifp->if_flags & IFF_BROADCAST) &&
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(ifra->ifra_broadaddr.sin_family == AF_INET))
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ia->ia_broadaddr = ifra->ifra_broadaddr;
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return (error);
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case SIOCDIFADDR:
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in_ifscrub(ifp, ia);
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/*
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* Protect from ipintr() traversing address list
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* while we're modifying it.
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*/
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s = splnet();
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ifa = &ia->ia_ifa;
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TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
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oia = ia;
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TAILQ_REMOVE(&in_ifaddrhead, oia, ia_link);
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IFAFREE(&oia->ia_ifa);
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splx(s);
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break;
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default:
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if (ifp == 0 || ifp->if_ioctl == 0)
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return (EOPNOTSUPP);
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return ((*ifp->if_ioctl)(ifp, cmd, data));
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}
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return (0);
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}
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/*
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* Delete any existing route for an interface.
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*/
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void
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in_ifscrub(ifp, ia)
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register struct ifnet *ifp;
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register struct in_ifaddr *ia;
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{
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if ((ia->ia_flags & IFA_ROUTE) == 0)
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return;
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if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
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rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
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else
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rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
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ia->ia_flags &= ~IFA_ROUTE;
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}
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/*
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* Initialize an interface's internet address
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* and routing table entry.
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*/
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static int
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in_ifinit(ifp, ia, sin, scrub)
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register struct ifnet *ifp;
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register struct in_ifaddr *ia;
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struct sockaddr_in *sin;
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int scrub;
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{
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register u_long i = ntohl(sin->sin_addr.s_addr);
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struct sockaddr_in oldaddr;
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int s = splimp(), flags = RTF_UP, error;
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oldaddr = ia->ia_addr;
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ia->ia_addr = *sin;
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/*
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* Give the interface a chance to initialize
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* if this is its first address,
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* and to validate the address if necessary.
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*/
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if (ifp->if_ioctl &&
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(error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
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splx(s);
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ia->ia_addr = oldaddr;
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return (error);
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}
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splx(s);
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if (scrub) {
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ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
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in_ifscrub(ifp, ia);
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ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
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}
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if (IN_CLASSA(i))
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ia->ia_netmask = IN_CLASSA_NET;
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else if (IN_CLASSB(i))
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ia->ia_netmask = IN_CLASSB_NET;
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else
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ia->ia_netmask = IN_CLASSC_NET;
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/*
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* The subnet mask usually includes at least the standard network part,
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* but may may be smaller in the case of supernetting.
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* If it is set, we believe it.
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*/
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if (ia->ia_subnetmask == 0) {
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ia->ia_subnetmask = ia->ia_netmask;
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ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
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} else
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ia->ia_netmask &= ia->ia_subnetmask;
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ia->ia_net = i & ia->ia_netmask;
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ia->ia_subnet = i & ia->ia_subnetmask;
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in_socktrim(&ia->ia_sockmask);
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/*
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* Add route for the network.
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*/
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ia->ia_ifa.ifa_metric = ifp->if_metric;
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if (ifp->if_flags & IFF_BROADCAST) {
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ia->ia_broadaddr.sin_addr.s_addr =
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htonl(ia->ia_subnet | ~ia->ia_subnetmask);
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ia->ia_netbroadcast.s_addr =
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htonl(ia->ia_net | ~ ia->ia_netmask);
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} else if (ifp->if_flags & IFF_LOOPBACK) {
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ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
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flags |= RTF_HOST;
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} else if (ifp->if_flags & IFF_POINTOPOINT) {
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if (ia->ia_dstaddr.sin_family != AF_INET)
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return (0);
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flags |= RTF_HOST;
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}
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if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0)
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ia->ia_flags |= IFA_ROUTE;
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/*
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* If the interface supports multicast, join the "all hosts"
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* multicast group on that interface.
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*/
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if (ifp->if_flags & IFF_MULTICAST) {
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struct in_addr addr;
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addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
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in_addmulti(&addr, ifp);
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}
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return (error);
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}
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/*
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* Return 1 if the address might be a local broadcast address.
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*/
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int
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in_broadcast(in, ifp)
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struct in_addr in;
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struct ifnet *ifp;
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{
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register struct ifaddr *ifa;
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u_long t;
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if (in.s_addr == INADDR_BROADCAST ||
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in.s_addr == INADDR_ANY)
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return 1;
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if ((ifp->if_flags & IFF_BROADCAST) == 0)
|
|
return 0;
|
|
t = ntohl(in.s_addr);
|
|
/*
|
|
* Look through the list of addresses for a match
|
|
* with a broadcast address.
|
|
*/
|
|
#define ia ((struct in_ifaddr *)ifa)
|
|
for (ifa = ifp->if_addrhead.tqh_first; ifa;
|
|
ifa = ifa->ifa_link.tqe_next)
|
|
if (ifa->ifa_addr->sa_family == AF_INET &&
|
|
(in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
|
|
in.s_addr == ia->ia_netbroadcast.s_addr ||
|
|
/*
|
|
* Check for old-style (host 0) broadcast.
|
|
*/
|
|
t == ia->ia_subnet || t == ia->ia_net) &&
|
|
/*
|
|
* Check for an all one subnetmask. These
|
|
* only exist when an interface gets a secondary
|
|
* address.
|
|
*/
|
|
ia->ia_subnetmask != (u_long)0xffffffff)
|
|
return 1;
|
|
return (0);
|
|
#undef ia
|
|
}
|
|
/*
|
|
* Add an address to the list of IP multicast addresses for a given interface.
|
|
*/
|
|
struct in_multi *
|
|
in_addmulti(ap, ifp)
|
|
register struct in_addr *ap;
|
|
register struct ifnet *ifp;
|
|
{
|
|
register struct in_multi *inm;
|
|
int error;
|
|
struct sockaddr_in sin;
|
|
struct ifmultiaddr *ifma;
|
|
int s = splnet();
|
|
|
|
/*
|
|
* Call generic routine to add membership or increment
|
|
* refcount. It wants addresses in the form of a sockaddr,
|
|
* so we build one here (being careful to zero the unused bytes).
|
|
*/
|
|
bzero(&sin, sizeof sin);
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_len = sizeof sin;
|
|
sin.sin_addr = *ap;
|
|
error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
|
|
if (error) {
|
|
splx(s);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If ifma->ifma_protospec is null, then if_addmulti() created
|
|
* a new record. Otherwise, we are done.
|
|
*/
|
|
if (ifma->ifma_protospec != 0)
|
|
return ifma->ifma_protospec;
|
|
|
|
/* XXX - if_addmulti uses M_WAITOK. Can this really be called
|
|
at interrupt time? If so, need to fix if_addmulti. XXX */
|
|
inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, M_NOWAIT);
|
|
if (inm == NULL) {
|
|
splx(s);
|
|
return (NULL);
|
|
}
|
|
|
|
bzero(inm, sizeof *inm);
|
|
inm->inm_addr = *ap;
|
|
inm->inm_ifp = ifp;
|
|
inm->inm_ifma = ifma;
|
|
ifma->ifma_protospec = inm;
|
|
LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
|
|
|
|
/*
|
|
* Let IGMP know that we have joined a new IP multicast group.
|
|
*/
|
|
igmp_joingroup(inm);
|
|
splx(s);
|
|
return (inm);
|
|
}
|
|
|
|
/*
|
|
* Delete a multicast address record.
|
|
*/
|
|
void
|
|
in_delmulti(inm)
|
|
register struct in_multi *inm;
|
|
{
|
|
struct ifmultiaddr *ifma = inm->inm_ifma;
|
|
int s = splnet();
|
|
|
|
if (ifma->ifma_refcount == 1) {
|
|
/*
|
|
* No remaining claims to this record; let IGMP know that
|
|
* we are leaving the multicast group.
|
|
*/
|
|
igmp_leavegroup(inm);
|
|
ifma->ifma_protospec = 0;
|
|
LIST_REMOVE(inm, inm_link);
|
|
free(inm, M_IPMADDR);
|
|
}
|
|
/* XXX - should be separate API for when we have an ifma? */
|
|
if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
|
|
splx(s);
|
|
}
|