19c749625f
ISDN4BSD is the work of our brand-new comitter: Hellmuth Michaelis, who has done a tremendous amount of work to bring us this far. There are still some outstanding issues and files to bring into the tree, and for now it will be needed to pick up all the extra docs from the isdn4bsd release. It is probably also a very good idea to subscribe to the isdn@freebsd.org mailing list before you try this out. These files correspond to release "beta Version 0.70.00 / December 1998" from Hellmuth.
276 lines
6.9 KiB
C
276 lines
6.9 KiB
C
/*
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* Copyright (c) 1997, 1998 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_iframe.c - i frame handling routines
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* ------------------------------------------
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*
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* $Id: i4b_iframe.c,v 1.15 1998/12/05 18:05:06 hm Exp $
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*
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* last edit-date: [Sat Dec 5 18:26:16 1998]
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*
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*---------------------------------------------------------------------------*/
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#ifdef __FreeBSD__
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#include "i4bq921.h"
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#else
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#define NI4BQ921 1
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#endif
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#if NI4BQ921 > 0
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#include <sys/param.h>
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#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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#include <sys/ioccom.h>
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#else
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#include <sys/ioctl.h>
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#endif
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#include <sys/kernel.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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#ifdef __FreeBSD__
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#include <machine/i4b_debug.h>
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#include <machine/i4b_ioctl.h>
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#include <machine/i4b_trace.h>
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#else
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#include <i4b/i4b_debug.h>
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#include <i4b/i4b_ioctl.h>
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#include <i4b/i4b_trace.h>
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#endif
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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_l2l3.h>
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#include <i4b/include/i4b_isdnq931.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 i frame
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* implements the routine "I COMMAND" Q.921 03/93 pp 77
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*---------------------------------------------------------------------------*/
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void
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i4b_rxd_i_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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int nr;
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int ns;
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int p;
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int x;
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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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if((l2sc->Q921_state != ST_MULTIFR) && (l2sc->Q921_state != ST_TIMREC))
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{
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i4b_Dfreembuf(m);
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DBGL2(L2_I_ERR, "i4b_rxd_i_frame", ("ERROR, state != (MF || TR)!\n"));
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return;
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}
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x = SPLI4B();
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nr = GETINR(*(ptr + OFF_INR));
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ns = GETINS(*(ptr + OFF_INS));
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p = GETIP(*(ptr + OFF_INR));
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i4b_rxd_ack(l2sc, nr); /* last packet ack */
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if(l2sc->own_busy) /* own receiver busy ? */
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{
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i4b_Dfreembuf(m); /* yes, discard information */
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if(p == 1) /* P bit == 1 ? */
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{
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i4b_tx_rnr_response(l2sc, p); /* yes, tx RNR */
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l2sc->ack_pend = 0; /* clear ACK pending */
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}
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}
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else /* own receiver ready */
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{
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if(ns == l2sc->vr) /* expected sequence number ? */
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{
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M128INC(l2sc->vr); /* yes, update */
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l2sc->rej_excpt = 0; /* clr reject exception */
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m_adj(m, I_HDR_LEN); /* strip i frame header */
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l2sc->iframe_sent = 0; /* reset i acked already */
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DL_Data_Ind(l2sc->unit, m); /* pass data up */
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if(!l2sc->iframe_sent)
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{
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i4b_tx_rr_response(l2sc, p); /* yes, tx RR */
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l2sc->ack_pend = 0; /* clr ACK pending */
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}
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}
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else /* ERROR, sequence number NOT expected */
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{
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i4b_Dfreembuf(m); /* discard information */
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if(l2sc->rej_excpt == 1) /* already exception ? */
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{
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if(p == 1) /* immediate response ? */
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{
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i4b_tx_rr_response(l2sc, p); /* yes, tx RR */
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l2sc->ack_pend = 0; /* clr ack pend */
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}
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}
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else /* not in exception cond */
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{
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l2sc->rej_excpt = 1; /* set exception */
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i4b_tx_rej_response(l2sc, p); /* tx REJ */
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l2sc->ack_pend = 0; /* clr ack pending */
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}
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}
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}
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/* sequence number ranges as expected ? */
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if(i4b_l2_nr_ok(nr, l2sc->va, l2sc->vs))
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{
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if(l2sc->Q921_state == ST_TIMREC)
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{
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l2sc->va = nr;
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splx(x);
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return;
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}
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if(l2sc->peer_busy) /* yes, other side busy ? */
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{
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l2sc->va = nr; /* yes, update ack count */
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}
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else /* other side ready */
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{
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if(nr == l2sc->vs) /* count expected ? */
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{
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l2sc->va = nr; /* update ack */
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i4b_T200_stop(l2sc);
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i4b_T203_restart(l2sc);
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}
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else
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{
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if(nr != l2sc->va)
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{
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l2sc->va = nr;
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i4b_T200_restart(l2sc);
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}
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}
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}
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}
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else
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{
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i4b_nr_error_recovery(l2sc); /* sequence error */
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l2sc->Q921_state = ST_AW_EST;
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}
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splx(x);
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}
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/*---------------------------------------------------------------------------*
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* internal I FRAME QUEUED UP routine (Q.921 03/93 p 61)
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*---------------------------------------------------------------------------*/
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void
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i4b_i_frame_queued_up(l2_softc_t *l2sc)
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{
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int x;
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struct mbuf *m;
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u_char *ptr;
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x = SPLI4B();
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if(l2sc->peer_busy)
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{
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DBGL2(L2_I_MSG, "i4b_i_frame_queued_up", ("peer busy!\n"));
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i4b_print_l2var(l2sc);
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splx(x);
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return;
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}
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if(l2sc->vs == ((l2sc->va + MAX_K_VALUE) & 127))
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{
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DBGL2(L2_I_ERR, "i4b_i_frame_queued_up", ("V(S) == ((V(A) + k) & 127)!\n"));
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DBGL2(L2_I_ERR, "i4b_i_frame_queued_up", ("state = %s\n", i4b_print_l2state(l2sc)));
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i4b_print_l2var(l2sc);
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splx(x);
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return;
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}
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IF_DEQUEUE(&l2sc->i_queue, m); /* fetch next frame to tx */
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if(!m)
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{
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DBGL2(L2_I_ERR, "i4b_i_frame_queued_up", ("ERROR, mbuf NULL after IF_DEQUEUE\n"));
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splx(x);
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return;
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}
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ptr = m->m_data;
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PUTSAPI(SAPI_CCP, CR_CMD_TO_NT, *(ptr + OFF_SAPI));
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PUTTEI(l2sc->tei, *(ptr + OFF_TEI));
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*(ptr + OFF_INS) = (l2sc->vs << 1) & 0xfe; /* bit 0 = 0 */
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*(ptr + OFF_INR) = (l2sc->vr << 1) & 0xfe; /* P bit = 0 */
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PH_Data_Req(l2sc->unit, m, MBUF_DONTFREE); /* free'd when ack'd ! */
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l2sc->iframe_sent = 1; /* in case we ack an I frame with another I frame */
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if(l2sc->ua_num != UA_EMPTY) /* failsafe */
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{
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DBGL2(L2_I_ERR, "i4b_i_frame_queued_up", ("ERROR, l2sc->ua_num: %d != UA_EMPTY\n", l2sc->ua_num));
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i4b_print_l2var(l2sc);
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i4b_Dfreembuf(l2sc->ua_frame);
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}
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l2sc->ua_frame = m; /* save unacked frame */
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l2sc->ua_num = l2sc->vs; /* save frame number */
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M128INC(l2sc->vs);
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l2sc->ack_pend = 0;
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splx(x);
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if(l2sc->T200 == TIMER_IDLE)
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{
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i4b_T203_stop(l2sc);
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i4b_T200_start(l2sc);
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}
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}
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#endif /* NI4BQ921 > 0 */
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