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//==========================================================================

//

//      sys/net/if_loop.c

//

//     

//

//==========================================================================

//####BSDCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD or other sources,

// and are covered by the appropriate copyright disclaimers included herein.

//

// -------------------------------------------

//

//####BSDCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    gthomas

// Contributors: gthomas

// Date:         2000-01-10

// Purpose:      

// Description:  

//              

//

//####DESCRIPTIONEND####

//

//==========================================================================

/*      $OpenBSD: if_loop.c,v 1.12 1999/12/08 06:50:18 itojun Exp $     */

/*      $NetBSD: if_loop.c,v 1.15 1996/05/07 02:40:33 thorpej Exp $     */

/*

 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.

 * 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. Neither the name of the project 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 PROJECT 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 PROJECT 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.

 */

/*

 * Copyright (c) 1982, 1986, 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.

 *

 *      @(#)if_loop.c   8.1 (Berkeley) 6/10/93

 */

/*

%%% portions-copyright-nrl-95

Portions of this software are Copyright 1995-1998 by Randall Atkinson,

Ronald Lee, Daniel McDonald, Bao Phan, and Chris Winters. All Rights

Reserved. All rights under this copyright have been assigned to the US

Naval Research Laboratory (NRL). The NRL Copyright Notice and License

Agreement Version 1.1 (January 17, 1995) applies to these portions of the

software.

You should have received a copy of the license with this software. If you

didn't get a copy, you may request one from <license@ipv6.nrl.navy.mil>.

*/

/*

 * Loopback interface driver for protocol testing and timing.

 */

#ifndef __ECOS

#include "bpfilter.h"

#include "loop.h"

#endif

#include <sys/param.h>

#ifndef __ECOS

#include <sys/systm.h>

#endif

#include <sys/kernel.h>

#include <sys/mbuf.h>

#include <sys/socket.h>

#include <sys/errno.h>

#include <sys/ioctl.h>

#include <sys/time.h>

#include <machine/cpu.h>

#include <net/if.h>

#include <net/if_types.h>

#include <net/netisr.h>

#include <net/route.h>

#ifdef  INET

#include <netinet/in.h>

#include <netinet/in_systm.h>

#include <netinet/in_var.h>

#include <netinet/ip.h>

#endif

#ifdef INET6

#ifndef INET

#include <netinet/in.h>

#endif

#include <netinet6/in6_var.h>

#include <netinet6/ip6.h>

#endif

#ifdef NS

#include <netns/ns.h>

#include <netns/ns_if.h>

#endif

#ifdef IPX

#include <netipx/ipx.h>

#include <netipx/ipx_if.h>

#endif

#ifdef ISO

#include <netiso/iso.h>

#include <netiso/iso_var.h>

#endif

#ifdef NETATALK

#include <netinet/if_ether.h>

#include <netatalk/at.h>

#include <netatalk/at_var.h>

#endif

#if NBPFILTER > 0

#include <net/bpf.h>

#endif

#if defined(LARGE_LOMTU)

#define LOMTU   (131072 +  MHLEN + MLEN)

#else

#define LOMTU   (32768 +  MHLEN + MLEN)

#endif

#ifndef __ECOS

#include <stdio.h>    // for 'sprintf()'

#endif

struct  ifnet loif[NLOOP];

void

loopattach(n)

        int n;

{

        register int i;

        register struct ifnet *ifp;

        for (i = NLOOP; i--; ) {

                ifp = &loif[i];

#if !defined(__ECOS) || (CYGPKG_NET_NLOOP > 1)

                sprintf(ifp->if_xname, "lo%d", i);

#else

                strcpy(ifp->if_xname, "lo0");

#endif                

                ifp->if_softc = NULL;

                ifp->if_mtu = LOMTU;

                ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;

                ifp->if_ioctl = loioctl;

                ifp->if_output = looutput;

                ifp->if_type = IFT_LOOP;

                ifp->if_hdrlen = sizeof(u_int32_t);

                ifp->if_addrlen = 0;

                if_attachhead(ifp);

#if NBPFILTER > 0

                bpfattach(&ifp->if_bpf, ifp, DLT_LOOP, sizeof(u_int32_t));

#endif

        }

}

int

looutput(ifp, m, dst, rt)

        struct ifnet *ifp;

        register struct mbuf *m;

        struct sockaddr *dst;

        register struct rtentry *rt;

{

        int s, isr;

        register struct ifqueue *ifq = 0;

        if ((m->m_flags & M_PKTHDR) == 0)

                panic("looutput: no header mbuf");

        ifp->if_lastchange = time;

#if NBPFILTER > 0

        /*

         * only send packets to bpf if they are real loopback packets;

         * looutput() is also called for SIMPLEX interfaces to duplicate

         * packets for local use. But don't dup them to bpf.

         */

        if (ifp->if_bpf && (ifp->if_flags&IFF_LOOPBACK)) {

                /*

                 * We need to prepend the address family as

                 * a four byte field.  Cons up a dummy header

                 * to pacify bpf.  This is safe because bpf

                 * will only read from the mbuf (i.e., it won't

                 * try to free it or keep a pointer to it).

                 */

                struct mbuf m0;

                u_int32_t af = htonl(dst->sa_family);

                m0.m_next = m;

                m0.m_len = sizeof(af);

                m0.m_data = (char *)⁡

                bpf_mtap(ifp->if_bpf, &m0);

        }

#endif

        m->m_pkthdr.rcvif = ifp;

        if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {

                m_freem(m);

                return (rt->rt_flags & RTF_BLACKHOLE ? 0 :

                        rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);

        }

#ifndef PULLDOWN_TEST

        /*

         * KAME requires that the packet to be contiguous on the

         * mbuf.  We need to make that sure.

         * this kind of code should be avoided.

         * XXX other conditions to avoid running this part?

         */

        if (m && m->m_next != NULL) {

                struct mbuf *n;

                MGETHDR(n, M_DONTWAIT, MT_HEADER);

                if (n) {

                        MCLGET(n, M_DONTWAIT);

                        if ((n->m_flags & M_EXT) == 0) {

                                m_free(n);

                                n = NULL;

                        }

                }

                if (!n) {

#ifdef __ECOS

                        diag_printf("looutput: mbuf allocation failed\n");

#else

                        printf("looutput: mbuf allocation failed\n");

#endif

                        m_freem(m);

                        return ENOBUFS;

                }

                n->m_pkthdr.rcvif = m->m_pkthdr.rcvif;

                n->m_pkthdr.len = m->m_pkthdr.len;

                if (m->m_pkthdr.len <= MCLBYTES) {

                        m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));

                        n->m_len = m->m_pkthdr.len;

                        m_freem(m);

                } else {

                        m_copydata(m, 0, MCLBYTES, mtod(n, caddr_t));

                        m_adj(m, MCLBYTES);

                        n->m_len = MCLBYTES;

                        n->m_next = m;

                        m->m_flags &= ~M_PKTHDR;

                }

                m = n;

        }

#if 0

        if (m && m->m_next != NULL) {

                printf("loop: not contiguous...\n");

                m_freem(m);

                return ENOBUFS;

        }

#endif

#endif

        ifp->if_opackets++;

        ifp->if_obytes += m->m_pkthdr.len;

        switch (dst->sa_family) {

#ifdef INET

        case AF_INET:

                ifq = &ipintrq;

                isr = NETISR_IP;

                break;

#endif

#ifdef INET6

        case AF_INET6:

                ifq = &ip6intrq;

                isr = NETISR_IPV6;

                break;

#endif /* INET6 */

#ifdef NS

        case AF_NS:

                ifq = &nsintrq;

                isr = NETISR_NS;

                break;

#endif

#ifdef IPX

        case AF_IPX:

                ifq = &ipxintrq;

                isr = NETISR_IPX;

                break;

#endif

#ifdef ISO

        case AF_ISO:

                ifq = &clnlintrq;

                isr = NETISR_ISO;

                break;

#endif

#ifdef NETATALK

        case AF_APPLETALK:

                ifq = &atintrq2;

                isr = NETISR_ATALK;

                break;

#endif

        default:

#ifdef __ECOS

                diag_printf("%s: can't handle af%d\n", ifp->if_xname,

                            dst->sa_family);

#else

                printf("%s: can't handle af%d\n", ifp->if_xname,

                        dst->sa_family);

#endif

                m_freem(m);

                return (EAFNOSUPPORT);

        }

        s = splimp();

        if (IF_QFULL(ifq)) {

                IF_DROP(ifq);

                m_freem(m);

                splx(s);

                return (ENOBUFS);

        }

        IF_ENQUEUE(ifq, m);

        schednetisr(isr);

        ifp->if_ipackets++;

        ifp->if_ibytes += m->m_pkthdr.len;

        splx(s);

        return (0);

}

/* ARGSUSED */

void

lortrequest(cmd, rt, sa)

        int cmd;

        struct rtentry *rt;

        struct sockaddr *sa;

{

        if (rt)

                rt->rt_rmx.rmx_mtu = LOMTU;

}

/*

 * Process an ioctl request.

 */

/* ARGSUSED */

int

loioctl(ifp, cmd, data)

        register struct ifnet *ifp;

        u_long cmd;

        caddr_t data;

{

        register struct ifaddr *ifa;

        register struct ifreq *ifr;

        register int error = 0;

        switch (cmd) {

        case SIOCSIFADDR:

                ifp->if_flags |= IFF_UP;

                ifa = (struct ifaddr *)data;

                if (ifa != 0 /*&& ifa->ifa_addr->sa_family == AF_ISO*/)

                        ifa->ifa_rtrequest = lortrequest;

                /*

                 * Everything else is done at a higher level.

                 */

                break;

        case SIOCADDMULTI:

        case SIOCDELMULTI:

                ifr = (struct ifreq *)data;

                if (ifr == 0) {

                        error = EAFNOSUPPORT;           /* XXX */

                        break;

                }

                switch (ifr->ifr_addr.sa_family) {

#ifdef INET

                case AF_INET:

                        break;

#endif

#ifdef INET6

                case AF_INET6:

                        break;

#endif /* INET6 */

                default:

                        error = EAFNOSUPPORT;

                        break;

                }

                break;

        default:

                error = EINVAL;

        }

        return (error);

}