papin.c

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/*
 * Copyright (C) 2001-2003 by egnite Software GmbH. 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 copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH 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 EGNITE
 * SOFTWARE GMBH 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,
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 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * For additional information see http://www.ethernut.de/
 *
 * -
 * Portions are 
 * Copyright (c) 1989 by Carnegie Mellon University.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by Carnegie Mellon University.  The name of the
 * University may not be used to endorse or promote products derived
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/*
 * $Log$
 * Revision 1.3  2008/08/11 07:00:31  haraldkipp
 * BSD types replaced by stdint types (feature request #1282721).
 *
 * Revision 1.2  2005/04/08 15:20:51  olereinhardt
 * added <sys/types.h> (__APPLE__) and <netinet/in.h> (__linux__)
 * for htons and simmilar.
 *
 * Revision 1.1.1.1  2003/05/09 14:41:35  haraldkipp
 * Initial using 3.2.1
 *
 * Revision 1.2  2003/05/06 18:16:41  harald
 * PPP IP config to DCB
 *
 * Revision 1.1  2003/03/31 14:53:28  harald
 * Prepare release 3.1
 *
 */

#include <dev/ppp.h>
#include <sys/types.h>
#include <net/if_var.h>
#include <netinet/if_ppp.h>
#include <netinet/ppp_fsm.h>
#include <netinet/in.h>


/*
 * No server support.
 */
void PapRxAuthReq(NUTDEVICE *dev, uint8_t id, NETBUF *nb)
{
    NutPapOutput(dev, XCP_CONFACK, id, nb);
}

void PapRxAuthAck(NUTDEVICE *dev, uint8_t id, NETBUF *nb)
{
    PPPDCB *dcb = dev->dev_dcb;

    if(dcb->dcb_auth_state == PAPCS_AUTHREQ) {
        /*
         * Flag us open and start the network.
         */
        dcb->dcb_auth_state = PAPCS_OPEN;
        IpcpLowerUp(dev);
    }
}

void PapRxAuthNak(NUTDEVICE *dev, uint8_t id, NETBUF *nb)
{
    PPPDCB *dcb = dev->dev_dcb;

    if(dcb->dcb_auth_state == PAPCS_AUTHREQ) {
        dcb->dcb_auth_state = PAPCS_BADAUTH;
        IpcpLowerDown(dev);
    }
}

void NutPapInput(NUTDEVICE * dev, NETBUF * nb)
{
    XCPHDR *pap;
    uint16_t len;

    /*
     * Drop packets with illegal lengths.
     */
    if (nb->nb_nw.sz < sizeof(XCPHDR)) {
        NutNetBufFree(nb);
        return;
    }
    pap = (XCPHDR *) nb->nb_nw.vp;
    if ((len = htons(pap->xch_len)) < sizeof(XCPHDR) || len > nb->nb_nw.sz) {
        NutNetBufFree(nb);
        return;
    }

    /*
     * Split the PAP packet.
     */
    nb->nb_ap.vp = pap + 1;
    nb->nb_ap.sz = htons(pap->xch_len) - sizeof(XCPHDR);

    /*
     * Action depends on code.
     */
    switch (pap->xch_code) {
    case XCP_CONFREQ:
        PapRxAuthReq(dev, pap->xch_id, nb);
        break;

    case XCP_CONFACK:
        PapRxAuthAck(dev, pap->xch_id, nb);
        break;

    case XCP_CONFNAK:
        PapRxAuthNak(dev, pap->xch_id, nb);
        break;

    default:
        break;
    }
    NutNetBufFree(nb);
}