FreeBSD/Linux Kernel Cross Reference
sys/netisdn/i4b_sframe.c

     /*
      * Copyright (c) 1997, 2000 Hellmuth Michaelis. 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     *
     *---------------------------------------------------------------------------
     *
     *      i4b_sframe.c - s frame handling routines
     *      ----------------------------------------
     *
     *      $Id: i4b_sframe.c,v 1.6 2003/10/03 16:38:44 pooka Exp $ 
     *
     * $FreeBSD$
     *
     *      last edit-date: [Fri Jan  5 11:33:47 2001]
     *
     *---------------------------------------------------------------------------*/
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: i4b_sframe.c,v 1.6 2003/10/03 16:38:44 pooka Exp $");
    
    #ifdef __FreeBSD__
    #include "i4bq921.h"
    #else
    #define NI4BQ921        1
    #endif
    #if NI4BQ921 > 0
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/systm.h>
    #include <sys/mbuf.h>
    #include <sys/socket.h>
    #include <net/if.h>
    
    #if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000
    #include <sys/callout.h>
    #endif
    
    #ifdef __FreeBSD__
    #include <machine/i4b_debug.h>
    #include <machine/i4b_ioctl.h>
    #else
    #include <netisdn/i4b_debug.h>
    #include <netisdn/i4b_ioctl.h>
    #endif
    
    #include <netisdn/i4b_l2.h>
    #include <netisdn/i4b_l1l2.h>
    #include <netisdn/i4b_isdnq931.h>
    #include <netisdn/i4b_mbuf.h>
    #include <netisdn/i4b_l2fsm.h>
    #include <netisdn/i4b_l3l4.h>
    
    /*---------------------------------------------------------------------------*
     *      process s frame
     *---------------------------------------------------------------------------*/
    void
    i4b_rxd_s_frame(l2_softc_t *l2sc, struct isdn_l3_driver *drv, struct mbuf *m)
    {
            u_char *ptr = m->m_data;
            
            if(!((l2sc->tei_valid == TEI_VALID) &&
                 (l2sc->tei == GETTEI(*(ptr+OFF_TEI)))))
            {
                    i4b_Dfreembuf(m);
                    return;
            }
    
            l2sc->rxd_CR = GETCR(*(ptr + OFF_SAPI));
            l2sc->rxd_PF = GETSPF(*(ptr + OFF_SNR));
            l2sc->rxd_NR = GETSNR(*(ptr + OFF_SNR));
    
            i4b_rxd_ack(l2sc, drv, l2sc->rxd_NR);
            
            switch(*(ptr + OFF_SRCR))
            {
                    case RR:
                            l2sc->stat.rx_rr++; /* update statistics */
                            NDBGL2(L2_S_MSG, "rx'd RR, N(R) = %d", l2sc->rxd_NR);
                           i4b_next_l2state(l2sc, drv, EV_RXRR);
                           break;
   
                   case RNR:
                           l2sc->stat.rx_rnr++; /* update statistics */
                           NDBGL2(L2_S_MSG, "rx'd RNR, N(R) = %d", l2sc->rxd_NR);
                           i4b_next_l2state(l2sc, drv, EV_RXRNR);
                           break;
   
                   case REJ:
                           l2sc->stat.rx_rej++; /* update statistics */
                           NDBGL2(L2_S_MSG, "rx'd REJ, N(R) = %d", l2sc->rxd_NR);
                           i4b_next_l2state(l2sc, drv, EV_RXREJ);
                           break;
   
                   default:
                           l2sc->stat.err_rx_bads++; /* update statistics */
                           NDBGL2(L2_S_ERR, "ERROR, unknown code, frame = ");
                           i4b_print_frame(m->m_len, m->m_data);
                           break;
           }
           i4b_Dfreembuf(m);       
   }
   
   /*---------------------------------------------------------------------------*
    *      transmit RR command
    *---------------------------------------------------------------------------*/
   void
   i4b_tx_rr_command(l2_softc_t *l2sc, pbit_t pbit)
   {
           struct mbuf *m;
   
           NDBGL2(L2_S_MSG, "tx RR, isdnif = %d", l2sc->drv->isdnif);
   
           m = i4b_build_s_frame(l2sc, CR_CMD_TO_NT, pbit, RR);
   
           l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE);
   
           l2sc->stat.tx_rr++; /* update statistics */
   }
   
   /*---------------------------------------------------------------------------*
    *      transmit RR response
    *---------------------------------------------------------------------------*/
   void
   i4b_tx_rr_response(l2_softc_t *l2sc, fbit_t fbit)
   {
           struct mbuf *m;
   
           NDBGL2(L2_S_MSG, "tx RR, isdnif = %d", l2sc->drv->isdnif);
   
           m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, RR);    
   
           l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE);
   
           l2sc->stat.tx_rr++; /* update statistics */
   }
   
   /*---------------------------------------------------------------------------*
    *      transmit RNR command
    *---------------------------------------------------------------------------*/
   void
   i4b_tx_rnr_command(l2_softc_t *l2sc, pbit_t pbit)
   {
           struct mbuf *m;
   
           NDBGL2(L2_S_MSG, "tx RNR, isdnif = %d", l2sc->drv->isdnif);
   
           m = i4b_build_s_frame(l2sc, CR_CMD_TO_NT, pbit, RNR);   
   
           l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE);
   
           l2sc->stat.tx_rnr++; /* update statistics */
   }
   
   /*---------------------------------------------------------------------------*
    *      transmit RNR response
    *---------------------------------------------------------------------------*/
   void
   i4b_tx_rnr_response(l2_softc_t *l2sc, fbit_t fbit)
   {
           struct mbuf *m;
   
           NDBGL2(L2_S_MSG, "tx RNR, isdnif = %d", l2sc->drv->isdnif);
   
           m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, RNR);
   
           l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE);
   
           l2sc->stat.tx_rnr++; /* update statistics */
   }
   
   /*---------------------------------------------------------------------------*
    *      transmit REJ response
    *---------------------------------------------------------------------------*/
   void
   i4b_tx_rej_response(l2_softc_t *l2sc, fbit_t fbit)
   {
           struct mbuf *m;
   
           NDBGL2(L2_S_MSG, "tx REJ, isdnif = %d", l2sc->drv->isdnif);
   
           m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, REJ);
   
           l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_FREE);
   
           l2sc->stat.tx_rej++; /* update statistics */    
   }
   
   /*---------------------------------------------------------------------------*
    *      build S-frame for sending
    *---------------------------------------------------------------------------*/
   struct mbuf *
   i4b_build_s_frame(l2_softc_t *l2sc, crbit_to_nt_t crbit, pbit_t pbit, u_char type)
   {
           struct mbuf *m;
           
           if((m = i4b_Dgetmbuf(S_FRAME_LEN)) == NULL)
                   return(NULL);
   
           PUTSAPI(SAPI_CCP, crbit, m->m_data[OFF_SAPI]);
                   
           PUTTEI(l2sc->tei, m->m_data[OFF_TEI]);
   
           m->m_data[OFF_SRCR] = type;
   
           m->m_data[OFF_SNR] = (l2sc->vr << 1) | (pbit & 0x01);
   
           return(m);
   }
   
   #endif /* NI4BQ921 > 0 */

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