pppin.c

Go to the documentation of this file.

/*
 * $Log$
 * Revision 1.9  2008/08/11 07:00:32  haraldkipp
 * BSD types replaced by stdint types (feature request #1282721).
 *
 * Revision 1.8  2006/10/05 17:25:41  haraldkipp
 * Avoid possible alignment errors. Fixes bug #1567748.
 *
 * Revision 1.7  2005/04/30 16:42:42  chaac
 * Fixed bug in handling of NUTDEBUG. Added include for cfg/os.h. If NUTDEBUG
 * is defined in NutConf, it will make effect where it is used.
 *
 * Revision 1.6  2005/04/08 15:20:51  olereinhardt
 * added <sys/types.h> (__APPLE__) and <netinet/in.h> (__linux__)
 * for htons and simmilar.
 *
 * Revision 1.5  2004/03/18 15:36:09  haraldkipp
 * ICCAVR failed to compile
 *
 * Revision 1.4  2004/03/08 11:27:44  haraldkipp
 * Accept incoming header compression.
 *
 * Revision 1.3  2003/08/14 15:15:28  haraldkipp
 * Unsuccessful try to fix ICCAVR bug
 *
 * Revision 1.2  2003/07/13 19:05:22  haraldkipp
 * Debug output corrected.
 *
 * Revision 1.1.1.1  2003/05/09 14:41:36  haraldkipp
 * Initial using 3.2.1
 *
 * Revision 1.2  2003/05/06 18:17:11  harald
 * Separate PPP debug module added.
 *
 * Revision 1.1  2003/03/31 14:53:28  harald
 * Prepare release 3.1
 *
 */

#include <cfg/os.h>
#include <dev/ppp.h>
#include <dev/ahdlc.h>

#include <netinet/in.h>
#include <netinet/if_ppp.h>
#include <netinet/ppp_fsm.h>
#include <netinet/ip.h>
#include <net/ppp.h>
#include <sys/types.h>
#include <sys/timer.h>

#ifdef NUTDEBUG
#include <net/netdebug.h>
#endif



void NutPppInput(NUTDEVICE * dev, NETBUF * nb)
{
    PPPHDR *ph = (PPPHDR *) nb->nb_dl.vp;
    PPPDCB *dcb = dev->dev_dcb;
    uint16_t protocol;
    uint8_t protocolsz;

#ifdef NUTDEBUG
    if (__ppp_trf) {
        fputs("\nPPP>", __ppp_trs);
        NutDumpPpp(__ppp_trs, nb);
    }
#elif defined(__IMAGECRAFT__)
    /*
     * No idea what this is, but ICCAVR fails if this call isn't there.
     */
    NutSleep(100);
#endif

    /*
     * Check if the address and control field is compressed.
     * Thanks to Francois Rademeyer.
     */
    if (ph->address != AHDLC_ALLSTATIONS) {

        /*
         * Check for protocol compression.
         * LSB of 2nd octet for protocol is always 1.
         */
        if (((uint8_t *) nb->nb_dl.vp)[0] & 0x01) {
            protocolsz = 1;
            protocol = *(uint8_t *) nb->nb_dl.vp;
        } else {
            char *cp = (char *)nb->nb_dl.vp;
            protocolsz = 2;
            protocol = ntohs(((uint16_t)cp[0] << 8) | cp[1]);
        }

        /*
         * Chop off the compressed header.
         */
        nb->nb_nw.vp = (char *)nb->nb_dl.vp + protocolsz;
        nb->nb_nw.sz = nb->nb_dl.sz - protocolsz;
        nb->nb_dl.sz = protocolsz;
    } else {
        /*
         * Chop off the PPP header.
         */
        nb->nb_nw.vp = ph + 1;
        nb->nb_nw.sz = nb->nb_dl.sz - sizeof(PPPHDR);
        nb->nb_dl.sz = sizeof(PPPHDR);

        protocol = ntohs(ph->prot_type);
    }

    /*
     * Toss all non-LCP packets unless LCP is OPEN.
     */
    if (protocol != PPP_LCP && dcb->dcb_lcp_state != PPPS_OPENED) {
        NutNetBufFree(nb);
        return;
    }

    /*
     * Until we get past the authentication phase, toss all packets
     * except LCP, LQR and authentication packets.
     */
    if (dcb->dcb_auth_state != PAPCS_OPEN &&
        !(protocol == PPP_LCP || protocol == PPP_LQR || protocol == PPP_PAP || protocol == PPP_CHAP)) {
        NutNetBufFree(nb);
        return;
    }

    /*
     * Route frame to the proper handler.
     */
    switch (protocol) {
    case PPP_IP:
        /* Internet protocol. */
        if (dcb->dcb_ipcp_state == PPPS_OPENED)
            NutIpInput(dev, nb);
        else
            NutNetBufFree(nb);
        break;

    case PPP_LCP:
        /* Link control protocol. */
        NutLcpInput(dev, nb);
        break;

    case PPP_IPCP:
        /* IP control protocol. */
        NutIpcpInput(dev, nb);
        break;

    case PPP_PAP:
        /* Password authentication protocol. */
        NutPapInput(dev, nb);
        break;

    default:
        LcpTxProtRej(dev, protocol, nb);
        break;
    }
}