306 lines
7.9 KiB
C
306 lines
7.9 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_util.c - layer 2 utility routines
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* -------------------------------------
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* last edit-date: [Sat Mar 9 17:55:03 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_global.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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/*---------------------------------------------------------------------------*
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* routine ESTABLISH DATA LINK (Q.921 03/93 page 83)
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*---------------------------------------------------------------------------*/
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void
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i4b_establish_data_link(l2_softc_t *l2sc)
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{
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i4b_l1_activate(l2sc);
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i4b_clear_exception_conditions(l2sc);
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l2sc->RC = 0;
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i4b_tx_sabme(l2sc, P1);
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i4b_T200_restart(l2sc);
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i4b_T203_stop(l2sc);
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}
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/*---------------------------------------------------------------------------*
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* routine CLEAR EXCEPTION CONDITIONS (Q.921 03/93 page 83)
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*---------------------------------------------------------------------------*/
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void
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i4b_clear_exception_conditions(l2_softc_t *l2sc)
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{
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CRIT_VAR;
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CRIT_BEG;
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/*XXX -------------------------------------------------------------- */
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/*XXX is this really appropriate here or should it moved elsewhere ? */
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i4b_Dcleanifq(&l2sc->i_queue);
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if(l2sc->ua_num != UA_EMPTY)
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{
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i4b_Dfreembuf(l2sc->ua_frame);
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l2sc->ua_num = UA_EMPTY;
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}
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/*XXX -------------------------------------------------------------- */
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l2sc->peer_busy = 0;
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l2sc->rej_excpt = 0;
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l2sc->own_busy = 0;
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l2sc->ack_pend = 0;
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CRIT_END;
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}
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/*---------------------------------------------------------------------------*
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* routine TRANSMIT ENQUIRE (Q.921 03/93 page 83)
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*---------------------------------------------------------------------------*/
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void
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i4b_transmit_enquire(l2_softc_t *l2sc)
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{
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if(l2sc->own_busy)
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i4b_tx_rnr_command(l2sc, P1);
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else
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i4b_tx_rr_command(l2sc, P1);
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l2sc->ack_pend = 0;
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i4b_T200_start(l2sc);
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}
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/*---------------------------------------------------------------------------*
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* routine NR ERROR RECOVERY (Q.921 03/93 page 83)
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*---------------------------------------------------------------------------*/
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void
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i4b_nr_error_recovery(l2_softc_t *l2sc)
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{
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i4b_mdl_error_ind(l2sc, "i4b_nr_error_recovery", MDL_ERR_J);
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i4b_establish_data_link(l2sc);
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l2sc->l3initiated = 0;
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}
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/*---------------------------------------------------------------------------*
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* routine ENQUIRY RESPONSE (Q.921 03/93 page 84)
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*---------------------------------------------------------------------------*/
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void
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i4b_enquiry_response(l2_softc_t *l2sc)
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{
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if(l2sc->own_busy)
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i4b_tx_rnr_response(l2sc, F1);
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else
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i4b_tx_rr_response(l2sc, F1);
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l2sc->ack_pend = 0;
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}
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/*---------------------------------------------------------------------------*
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* routine INVOKE RETRANSMISSION (Q.921 03/93 page 84)
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*---------------------------------------------------------------------------*/
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void
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i4b_invoke_retransmission(l2_softc_t *l2sc, int nr)
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{
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CRIT_VAR;
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CRIT_BEG;
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NDBGL2(L2_ERROR, "nr = %d", nr );
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while(l2sc->vs != nr)
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{
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NDBGL2(L2_ERROR, "nr(%d) != vs(%d)", nr, l2sc->vs);
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M128DEC(l2sc->vs);
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/* XXXXXXXXXXXXXXXXX */
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if((l2sc->ua_num != UA_EMPTY) && (l2sc->vs == l2sc->ua_num))
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{
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if(_IF_QFULL(&l2sc->i_queue))
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{
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NDBGL2(L2_ERROR, "ERROR, I-queue full!");
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}
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else
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{
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IF_ENQUEUE(&l2sc->i_queue, l2sc->ua_frame);
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l2sc->ua_num = UA_EMPTY;
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}
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}
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else
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{
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NDBGL2(L2_ERROR, "ERROR, l2sc->vs = %d, l2sc->ua_num = %d ",l2sc->vs, l2sc->ua_num);
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}
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/* XXXXXXXXXXXXXXXXX */
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i4b_i_frame_queued_up(l2sc);
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}
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CRIT_END;
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}
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/*---------------------------------------------------------------------------*
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* routine ACKNOWLEDGE PENDING (Q.921 03/93 p 70)
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*---------------------------------------------------------------------------*/
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void
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i4b_acknowledge_pending(l2_softc_t *l2sc)
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{
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if(l2sc->ack_pend)
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{
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l2sc->ack_pend = 0;
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i4b_tx_rr_response(l2sc, F0);
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}
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}
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/*---------------------------------------------------------------------------*
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* i4b_print_frame - just print the hex contents of a frame
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*---------------------------------------------------------------------------*/
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void
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i4b_print_frame(int len, u_char *buf)
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{
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#if DO_I4B_DEBUG
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int i;
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if (!(i4b_l2_debug & L2_ERROR)) /* XXXXXXXXXXXXXXXXXXXXX */
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return;
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for(i = 0; i < len; i++)
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printf(" 0x%x", buf[i]);
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printf("\n");
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#endif
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}
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/*---------------------------------------------------------------------------*
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* i4b_print_l2var - print some l2softc vars
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*---------------------------------------------------------------------------*/
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void
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i4b_print_l2var(l2_softc_t *l2sc)
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{
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NDBGL2(L2_ERROR, "unit%d V(R)=%d, V(S)=%d, V(A)=%d,ACKP=%d,PBSY=%d,OBSY=%d",
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l2sc->unit,
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l2sc->vr,
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l2sc->vs,
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l2sc->va,
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l2sc->ack_pend,
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l2sc->peer_busy,
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l2sc->own_busy);
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}
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/*---------------------------------------------------------------------------*
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* got s or i frame, check if valid ack for last sent frame
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*---------------------------------------------------------------------------*/
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void
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i4b_rxd_ack(l2_softc_t *l2sc, int nr)
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{
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#ifdef NOTDEF
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NDBGL2(L2_ERROR, "N(R)=%d, UA=%d, V(R)=%d, V(S)=%d, V(A)=%d",
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nr,
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l2sc->ua_num,
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l2sc->vr,
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l2sc->vs,
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l2sc->va);
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#endif
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if(l2sc->ua_num != UA_EMPTY)
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{
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CRIT_VAR;
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CRIT_BEG;
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M128DEC(nr);
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if(l2sc->ua_num != nr)
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NDBGL2(L2_ERROR, "((N(R)-1)=%d) != (UA=%d) !!!", nr, l2sc->ua_num);
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i4b_Dfreembuf(l2sc->ua_frame);
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l2sc->ua_num = UA_EMPTY;
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CRIT_END;
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}
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}
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/*---------------------------------------------------------------------------*
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* if not already active, activate layer 1
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*---------------------------------------------------------------------------*/
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void
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i4b_l1_activate(l2_softc_t *l2sc)
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{
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if(l2sc->ph_active == PH_INACTIVE)
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{
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l2sc->ph_active = PH_ACTIVEPEND;
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PH_Act_Req(l2sc->unit);
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}
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};
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/*---------------------------------------------------------------------------*
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* check for v(a) <= n(r) <= v(s)
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* nr = receive sequence frame counter, va = acknowledge sequence frame
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* counter and vs = transmit sequence frame counter
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*---------------------------------------------------------------------------*/
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int
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i4b_l2_nr_ok(int nr, int va, int vs)
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{
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if((va > nr) && ((nr != 0) || (va != 127)))
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{
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NDBGL2(L2_ERROR, "ERROR, va = %d, nr = %d, vs = %d [1]", va, nr, vs);
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return 0; /* fail */
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}
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if((nr > vs) && ((vs != 0) || (nr != 127)))
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{
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NDBGL2(L2_ERROR, "ERROR, va = %d, nr = %d, vs = %d [2]", va, nr, vs);
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return 0; /* fail */
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}
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return 1; /* good */
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}
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