207 lines
6.0 KiB
C
207 lines
6.0 KiB
C
/*
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* Copyright (c) 1997, 2002 Hellmuth Michaelis. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*---------------------------------------------------------------------------
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*
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* i4b_sframe.c - s frame handling routines
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* ----------------------------------------
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* last edit-date: [Sat Mar 9 17:52:06 2002]
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*
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*---------------------------------------------------------------------------*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <machine/i4b_debug.h>
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#include <i4b/include/i4b_l1l2.h>
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#include <i4b/include/i4b_mbuf.h>
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#include <i4b/layer2/i4b_l2.h>
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#include <i4b/layer2/i4b_l2fsm.h>
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/*---------------------------------------------------------------------------*
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* process s frame
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*---------------------------------------------------------------------------*/
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void
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i4b_rxd_s_frame(int unit, struct mbuf *m)
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{
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l2_softc_t *l2sc = &l2_softc[unit];
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u_char *ptr = m->m_data;
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if(!((l2sc->tei_valid == TEI_VALID) &&
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(l2sc->tei == GETTEI(*(ptr+OFF_TEI)))))
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{
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i4b_Dfreembuf(m);
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return;
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}
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l2sc->rxd_CR = GETCR(*(ptr + OFF_SAPI));
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l2sc->rxd_PF = GETSPF(*(ptr + OFF_SNR));
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l2sc->rxd_NR = GETSNR(*(ptr + OFF_SNR));
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i4b_rxd_ack(l2sc, l2sc->rxd_NR);
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switch(*(ptr + OFF_SRCR))
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{
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case RR:
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l2sc->stat.rx_rr++; /* update statistics */
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NDBGL2(L2_S_MSG, "rx'd RR, N(R) = %d", l2sc->rxd_NR);
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i4b_next_l2state(l2sc, EV_RXRR);
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break;
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case RNR:
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l2sc->stat.rx_rnr++; /* update statistics */
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NDBGL2(L2_S_MSG, "rx'd RNR, N(R) = %d", l2sc->rxd_NR);
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i4b_next_l2state(l2sc, EV_RXRNR);
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break;
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case REJ:
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l2sc->stat.rx_rej++; /* update statistics */
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NDBGL2(L2_S_MSG, "rx'd REJ, N(R) = %d", l2sc->rxd_NR);
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i4b_next_l2state(l2sc, EV_RXREJ);
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break;
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default:
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l2sc->stat.err_rx_bads++; /* update statistics */
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NDBGL2(L2_S_ERR, "ERROR, unknown code, frame = ");
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i4b_print_frame(m->m_len, m->m_data);
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break;
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}
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i4b_Dfreembuf(m);
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}
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/*---------------------------------------------------------------------------*
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* transmit RR command
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*---------------------------------------------------------------------------*/
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void
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i4b_tx_rr_command(l2_softc_t *l2sc, pbit_t pbit)
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{
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struct mbuf *m;
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NDBGL2(L2_S_MSG, "tx RR, unit = %d", l2sc->unit);
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m = i4b_build_s_frame(l2sc, CR_CMD_TO_NT, pbit, RR);
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PH_Data_Req(l2sc->unit, m, MBUF_FREE);
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l2sc->stat.tx_rr++; /* update statistics */
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}
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/*---------------------------------------------------------------------------*
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* transmit RR response
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*---------------------------------------------------------------------------*/
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void
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i4b_tx_rr_response(l2_softc_t *l2sc, fbit_t fbit)
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{
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struct mbuf *m;
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NDBGL2(L2_S_MSG, "tx RR, unit = %d", l2sc->unit);
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m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, RR);
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PH_Data_Req(l2sc->unit, m, MBUF_FREE);
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l2sc->stat.tx_rr++; /* update statistics */
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}
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/*---------------------------------------------------------------------------*
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* transmit RNR command
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*---------------------------------------------------------------------------*/
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void
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i4b_tx_rnr_command(l2_softc_t *l2sc, pbit_t pbit)
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{
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struct mbuf *m;
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NDBGL2(L2_S_MSG, "tx RNR, unit = %d", l2sc->unit);
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m = i4b_build_s_frame(l2sc, CR_CMD_TO_NT, pbit, RNR);
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PH_Data_Req(l2sc->unit, m, MBUF_FREE);
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l2sc->stat.tx_rnr++; /* update statistics */
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}
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/*---------------------------------------------------------------------------*
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* transmit RNR response
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*---------------------------------------------------------------------------*/
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void
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i4b_tx_rnr_response(l2_softc_t *l2sc, fbit_t fbit)
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{
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struct mbuf *m;
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NDBGL2(L2_S_MSG, "tx RNR, unit = %d", l2sc->unit);
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m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, RNR);
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PH_Data_Req(l2sc->unit, m, MBUF_FREE);
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l2sc->stat.tx_rnr++; /* update statistics */
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}
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/*---------------------------------------------------------------------------*
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* transmit REJ response
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*---------------------------------------------------------------------------*/
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void
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i4b_tx_rej_response(l2_softc_t *l2sc, fbit_t fbit)
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{
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struct mbuf *m;
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NDBGL2(L2_S_MSG, "tx REJ, unit = %d", l2sc->unit);
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m = i4b_build_s_frame(l2sc, CR_RSP_TO_NT, fbit, REJ);
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PH_Data_Req(l2sc->unit, m, MBUF_FREE);
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l2sc->stat.tx_rej++; /* update statistics */
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}
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/*---------------------------------------------------------------------------*
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* build S-frame for sending
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*---------------------------------------------------------------------------*/
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struct mbuf *
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i4b_build_s_frame(l2_softc_t *l2sc, crbit_to_nt_t crbit, pbit_t pbit, u_char type)
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{
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struct mbuf *m;
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if((m = i4b_Dgetmbuf(S_FRAME_LEN)) == NULL)
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return(NULL);
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PUTSAPI(SAPI_CCP, crbit, m->m_data[OFF_SAPI]);
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PUTTEI(l2sc->tei, m->m_data[OFF_TEI]);
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m->m_data[OFF_SRCR] = type;
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m->m_data[OFF_SNR] = (l2sc->vr << 1) | (pbit & 0x01);
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return(m);
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}
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