InfoMagic Source Code 1993 July/THE_SOURCE_CODE_CD_ROM.iso/bsd_srcs/sys/net/if_loop.c

C/C++ Source or Header | 1991-05-06 | 4.4 KB | 189 lines

/*
 * Copyright (c) 1982, 1986 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    7.13 (Berkeley) 4/26/91
 */

/*
 * Loopback interface driver for protocol testing and timing.
 */

#include "param.h"
#include "systm.h"
#include "mbuf.h"
#include "socket.h"
#include "errno.h"
#include "ioctl.h"

#include "../net/if.h"
#include "../net/if_types.h"
#include "../net/netisr.h"
#include "../net/route.h"

#include "machine/mtpr.h"

#ifdef    INET
#include "../netinet/in.h"
#include "../netinet/in_systm.h"
#include "../netinet/in_var.h"
#include "../netinet/ip.h"
#endif

#ifdef NS
#include "../netns/ns.h"
#include "../netns/ns_if.h"
#endif

#ifdef ISO
#include "../netiso/iso.h"
#include "../netiso/iso_var.h"
#endif

#define    LOMTU    (1024+512)

struct    ifnet loif;
int    looutput(), loioctl();

loattach()
{
    register struct ifnet *ifp = &loif;

    ifp->if_name = "lo";
    ifp->if_mtu = LOMTU;
    ifp->if_flags = IFF_LOOPBACK;
    ifp->if_ioctl = loioctl;
    ifp->if_output = looutput;
    ifp->if_type = IFT_LOOP;
    ifp->if_hdrlen = 0;
    ifp->if_addrlen = 0;
    if_attach(ifp);
}

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 HDR");
    m->m_pkthdr.rcvif = ifp;

    if (rt && rt->rt_flags & RTF_REJECT) {
        m_freem(m);
        return (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
    }
    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 NS
    case AF_NS:
        ifq = &nsintrq;
        isr = NETISR_NS;
        break;
#endif
#ifdef ISO
    case AF_ISO:
        ifq = &clnlintrq;
        isr = NETISR_ISO;
        break;
#endif
    default:
        printf("lo%d: can't handle af%d\n", ifp->if_unit,
            dst->sa_family);
        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 */
lortrequest(cmd, rt, sa)
struct rtentry *rt;
struct sockaddr *sa;
{
    if (rt)
        rt->rt_rmx.rmx_mtu = LOMTU;
}

/*
 * Process an ioctl request.
 */
/* ARGSUSED */
loioctl(ifp, cmd, data)
    register struct ifnet *ifp;
    int cmd;
    caddr_t data;
{
    register struct ifaddr *ifa;
    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;

    default:
        error = EINVAL;
    }
    return (error);
}