in.c

vxworks5.5.1源代码。完整源代码

/* in.c - internet routines */

/* Copyright 1984 - 2001 Wind River Systems, Inc. */
#include "copyright_wrs.h"

/*
 * Copyright (c) 1982, 1986, 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)in.c	8.4 (Berkeley) 1/9/95
 */

/*
modification history
--------------------
01m,12oct01,rae  merge from truestack ver 01n, base 01j (SPR #67536 etc)
01l,30jan01,spm  ignored existing routes for alias IP addresses (SPR #62333)
01k,20apr00,rae  fixed memory leak in in_ifinit, SPR#28903
01j,22feb99,ham  called in_socktrim() in SIOCSIFNETMASK, SPR#24251.
01h,06oct98,ham  cancelled "01g" moidification, new fix for SPR#22267.
01g,08sep98,ham  fixed SIOCAIFADDR inproper work in in_control SPR#22267.
01f,08dec97,vin  fixed a bug in_addmulti incremented the ref count SPR 9971
01e,03dec97,vin  changed _pNetDpool to _pNetSysPool
01d,05oct97,vin  added fast multicasting.
01c,07jan96,vin  added _igmpJoinGrpHook and _igmpLeaveGrpHook for scaling igmp.
01b,05dec96,vin  replaced malloc with MALLOC and free with FREE(),
01a,03mar96,vin  created from BSD4.4 stuff,integrated with 02n of in.c.
*/

/*
DESCRIPTION
*/

#include "vxWorks.h"
#include "logLib.h"
#include "sys/ioctl.h"
#include "net/mbuf.h"
#include "net/protosw.h"
#include "sys/socket.h"
#include "net/socketvar.h"
#include "net/uio.h"
#include "errno.h"
#include "netinet/in_systm.h"
#include "net/if.h"
#include "net/route.h"
#include "netinet/in.h"
#include "netinet/in_var.h"
#include "net/systm.h"
#include "netinet/igmp_var.h"
#include "net/unixLib.h"

#ifdef VIRTUAL_STACK
#include "netinet/vsLib.h"
#include "netinet/vsIgmp.h"
#endif /* VIRTUAL_STACK */

#ifdef INET

#ifdef WV_INSTRUMENTATION
#ifdef INCLUDE_WVNET
#include "wvNetLib.h"
#endif
#endif

/* defines */

/* externals */

extern void arp_rtrequest (); 
extern VOIDFUNCPTR _igmpJoinGrpHook; 
extern VOIDFUNCPTR _igmpLeaveGrpHook; 

/* globals */
#ifndef SUBNETSARELOCAL
#define	SUBNETSARELOCAL	1
#endif

int subnetsarelocal = SUBNETSARELOCAL;
int	in_interfaces;		/* number of external internet interfaces */

#ifndef VIRTUAL_STACK
extern	struct ifnet loif[];	/* loop back interface */
struct mcastHashInfo	mCastHashInfo;
#endif

int	mCastHashTblSize = 64;	/* default size of hash table */


#ifdef WV_INSTRUMENTATION
#ifdef INCLUDE_WVNET
    /* Set common fields of event identifiers for this module. */

LOCAL UCHAR wvNetModuleId = WV_NET_IN_MODULE;   /* Value for in.c */
LOCAL UCHAR wvNetLocalFilter = WV_NET_NONE;     /* Available event filter */

LOCAL ULONG wvNetEventId;       /* Event identifier: see wvNetLib.h */
#endif    /* INCLUDE_WVNET */
#endif

BOOL inet_netmatch(sin1, sin2)
	struct sockaddr_in *sin1;
	struct sockaddr_in *sin2;
{

	return (in_netof(sin1->sin_addr) == in_netof(sin2->sin_addr));
}

/*
 * The following routines, in_netof, and in_lnaof,
 * are similar to the corresponding routines in inetLib, except that
 * these routines take subnet masks into account.
 */

/*
 * Return the network number from an internet address.
 */
u_long
in_netof(in)
	struct in_addr in;
{
	register u_long i = ntohl(in.s_addr);
	register u_long net;
	register struct in_ifaddr *ia;

	if (IN_CLASSA(i))
		net = i & IN_CLASSA_NET; 
	else if (IN_CLASSB(i))
		net = i & IN_CLASSB_NET;
	else if (IN_CLASSC(i))
		net = i & IN_CLASSC_NET;
	else if (IN_CLASSD(i))
		net = i & IN_CLASSD_NET;
	else
		return (0);

	/*
	 * Check whether network is a subnet;
	 * if so, return subnet number.
	 */
#ifdef VIRTUAL_STACK
	for (ia = _in_ifaddr; ia; ia = ia->ia_next)
#else
	for (ia = in_ifaddr; ia; ia = ia->ia_next)
#endif /* VIRTUAL_STACK */
		if (net == ia->ia_net)
			return (i & ia->ia_subnetmask);
	return (net);
}

/*
 * Return 1 if an internet address is for a ``local'' host
 * (one to which we have a connection).  If subnetsarelocal
 * is true, this includes other subnets of the local net.
 * Otherwise, it includes only the directly-connected (sub)nets.
 */
int
in_localaddr(in)
	struct in_addr in;
{
	register u_long i = ntohl(in.s_addr);
	register struct in_ifaddr *ia;

	if (subnetsarelocal) {
#ifdef VIRTUAL_STACK
		for (ia = _in_ifaddr; ia; ia = ia->ia_next)
#else
		for (ia = in_ifaddr; ia; ia = ia->ia_next)
#endif /* VIRTUAL_STACK */
			if ((i & ia->ia_netmask) == ia->ia_net)
				return (1);
	} else {
#ifdef VIRTUAL_STACK
		for (ia = _in_ifaddr; ia; ia = ia->ia_next)
#else
		for (ia = in_ifaddr; ia; ia = ia->ia_next)
#endif /* VIRTUAL_STACK */
			if ((i & ia->ia_subnetmask) == ia->ia_subnet)
				return (1);
	}
	return (0);
}

/*
 * Determine whether an IP address is in a reserved set of addresses
 * that may not be forwarded, or whether datagrams to that destination
 * may be forwarded.
 */
int
in_canforward(in)
	struct in_addr in;
{
	register u_long i = ntohl(in.s_addr);
	register u_long net;

	if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
		return (0);
	if (IN_CLASSA(i)) {
		net = i & IN_CLASSA_NET;
		if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
			return (0);
	}
	return (1);
}

/*
 * Trim a mask in a sockaddr
 */
void
in_socktrim(ap)
struct sockaddr_in *ap;
{
    register char *cplim = (char *) &ap->sin_addr;
    register char *cp = (char *) (&ap->sin_addr + 1);

    ap->sin_len = 0;
    while (--cp >= cplim)
        if (*cp) {
	    (ap)->sin_len = cp - (char *) (ap) + 1;
	    break;
	}
}

/*
 * Return the host portion of an internet address.
 */
u_long
in_lnaof(in)
        struct in_addr in;
{
        register u_long i = ntohl(in.s_addr);
        register u_long net, host;
        register struct in_ifaddr *ia;

        if (IN_CLASSA(i)) {
                net = i & IN_CLASSA_NET;
                host = i & IN_CLASSA_HOST;
        } else if (IN_CLASSB(i)) {
                net = i & IN_CLASSB_NET;
                host = i & IN_CLASSB_HOST;
        } else if (IN_CLASSC(i)) {
                net = i & IN_CLASSC_NET;
                host = i & IN_CLASSC_HOST;
        } else if (IN_CLASSD(i)) {
                net = i & IN_CLASSD_NET;
                host = i & IN_CLASSD_HOST;
        } else
                return (i);

        /*
         * Check whether network is a subnet;
         * if so, use the modified interpretation of `host'.
         */
#ifdef VIRTUAL_STACK
        for (ia = _in_ifaddr; ia; ia = ia->ia_next)
#else
        for (ia = in_ifaddr; ia; ia = ia->ia_next)
#endif /* VIRTUAL_STACK */
                if (net == ia->ia_net)
                        return (host &~ ia->ia_subnetmask);
        return (host);
}

/*
 * Generic internet control operations (ioctl's).
 * Ifp is 0 if not an interface-specific ioctl.
 */
/* ARGSUSED */
int
in_control(so, cmd, data, ifp)
	struct socket *so;
	u_long cmd;
	caddr_t data;
	register struct ifnet *ifp;
{
	register struct ifreq *ifr = (struct ifreq *)data;
	register struct in_ifaddr *ia = 0;
	register struct ifaddr *ifa;
	struct in_ifaddr *oia;
	struct in_aliasreq *ifra = (struct in_aliasreq *)data;
	struct sockaddr_in oldaddr;
	int error, hostIsNew, maskIsNew;
	u_long i;
        BOOL newRouteFlag = FALSE; 	/* Connection to new IP subnet? */

#ifdef WV_INSTRUMENTATION
#ifdef INCLUDE_WVNET    /* WV_NET_VERBOSE event */
        WV_NET_MARKER_1 (NET_AUX_EVENT, WV_NET_VERBOSE, 18, 7,
                         WV_NETEVENT_INCTRL_START, cmd)
#endif  /* INCLUDE_WVNET */
#endif

            /*
             * Find address for this interface, if it exists.
             */
            if (ifp)
#ifdef VIRTUAL_STACK
                for (ia = _in_ifaddr; ia; ia = ia->ia_next)
#else
                    for (ia = in_ifaddr; ia; ia = ia->ia_next)
#endif /* VIRTUAL_STACK */
			if (ia->ia_ifp == ifp)
                            break;
        
	switch (cmd) {
        
	case SIOCAIFADDR:
            
            if (ia == 0)
                {
                /* First IP address: no matching route should exist. */
                
                newRouteFlag = TRUE;
                }
            
            /* fall-through */
            
	case SIOCDIFADDR:
            if (ifra->ifra_addr.sin_family == AF_INET)
                for (oia = ia; ia; ia = ia->ia_next) {
                if (ia->ia_ifp == ifp  &&
			    ia->ia_addr.sin_addr.s_addr ==
                    ifra->ifra_addr.sin_addr.s_addr)
                    break;
		}
            if (cmd == SIOCDIFADDR && ia == 0)
                {
#ifdef WV_INSTRUMENTATION
#ifdef INCLUDE_WVNET    /* WV_NET_ERROR event */
                WV_NET_MARKER_2 (NET_AUX_EVENT, WV_NET_ERROR, 8, 4, 
                                 WV_NETEVENT_INCTRL_SEARCHFAIL, cmd, ifp)
#endif  /* INCLUDE_WVNET */
#endif
                    return (EADDRNOTAVAIL);
                }
            
            /* FALLTHROUGH */
	case SIOCSIFADDR:
	case SIOCSIFNETMASK:
	case SIOCSIFDSTADDR:
            if ((so->so_state & SS_PRIV) == 0)
                {
#ifdef WV_INSTRUMENTATION
#ifdef INCLUDE_WVNET    /* WV_NET_WARNING event */
                WV_NET_MARKER_2 (NET_AUX_EVENT, WV_NET_WARNING, 6, 6, 
                                 WV_NETEVENT_INCTRL_BADSOCK, so->so_fd, cmd)
#endif  /* INCLUDE_WVNET */
#endif
                    return (EPERM);
                }
            if (ifp == 0)
                {
#ifdef WV_INSTRUMENTATION
#ifdef INCLUDE_WVNET    /* WV_NET_EMERGENCY event */
                WV_NET_MARKER_1 (NET_AUX_EVENT, WV_NET_EMERGENCY, 10, 1, 
                                 WV_NETEVENT_INCTRL_PANIC, cmd)
#endif  /* INCLUDE_WVNET */
#endif

                    panic("in_control");
                }
            if (ia == (struct in_ifaddr *)0) {
            MALLOC (oia, struct in_ifaddr *, sizeof(*oia),
				MT_IFADDR, M_WAIT); 
			if (oia == (struct in_ifaddr *)NULL)
                            {
#ifdef WV_INSTRUMENTATION
#ifdef INCLUDE_WVNET    /* WV_NET_EMERGENCY event */
                            WV_NET_MARKER_1 (NET_AUX_EVENT, WV_NET_EMERGENCY, 11, 2, 
                                             WV_NETEVENT_INCTRL_NOBUFS, cmd)
#endif  /* INCLUDE_WVNET */
#endif
                            return (ENOBUFS);
                            }
			bzero((caddr_t)oia, sizeof *oia);
#ifdef VIRTUAL_STACK
			if ((ia = _in_ifaddr)) {
#else
			if ((ia = in_ifaddr)) {
#endif /* VIRTUAL_STACK */