diff options
Diffstat (limited to 'sys/i4b/layer2/i4b_util.c')
| -rw-r--r-- | sys/i4b/layer2/i4b_util.c | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/sys/i4b/layer2/i4b_util.c b/sys/i4b/layer2/i4b_util.c new file mode 100644 index 0000000..9f8fe19 --- /dev/null +++ b/sys/i4b/layer2/i4b_util.c @@ -0,0 +1,312 @@ +/* + * Copyright (c) 1997, 1998 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_util.c - layer 2 utility routines + * ------------------------------------- + * + * $Id: i4b_util.c,v 1.15 1998/12/05 18:05:26 hm Exp $ + * + * last edit-date: [Sat Dec 5 18:31:10 1998] + * + *---------------------------------------------------------------------------*/ + +#ifdef __FreeBSD__ +#include "i4bq921.h" +#else +#define NI4BQ921 1 +#endif +#if NI4BQ921 > 0 + +#include <sys/param.h> +#if defined(__FreeBSD__) && __FreeBSD__ >= 3 +#include <sys/ioccom.h> +#else +#include <sys/ioctl.h> +#endif +#include <sys/kernel.h> +#include <sys/systm.h> +#include <sys/mbuf.h> +#include <sys/socket.h> +#include <net/if.h> + +#ifdef __FreeBSD__ +#include <machine/i4b_debug.h> +#include <machine/i4b_ioctl.h> +#else +#include <i4b/i4b_debug.h> +#include <i4b/i4b_ioctl.h> +#endif + +#include <i4b/include/i4b_global.h> +#include <i4b/include/i4b_l1l2.h> +#include <i4b/include/i4b_l2l3.h> +#include <i4b/include/i4b_isdnq931.h> +#include <i4b/include/i4b_mbuf.h> + +#include <i4b/layer2/i4b_l2.h> +#include <i4b/layer2/i4b_l2fsm.h> + +/*---------------------------------------------------------------------------* + * routine ESTABLISH DATA LINK (Q.921 03/93 page 83) + *---------------------------------------------------------------------------*/ +void +i4b_establish_data_link(l2_softc_t *l2sc) +{ + i4b_l1_activate(l2sc); + + i4b_clear_exception_conditions(l2sc); + + l2sc->RC = 0; + + i4b_tx_sabme(l2sc, P1); + + i4b_T200_restart(l2sc); + + i4b_T203_stop(l2sc); +} + +/*---------------------------------------------------------------------------* + * routine CLEAR EXCEPTION CONDITIONS (Q.921 03/93 page 83) + *---------------------------------------------------------------------------*/ +void +i4b_clear_exception_conditions(l2_softc_t *l2sc) +{ + +/*XXX -------------------------------------------------------------- */ +/*XXX is this really appropriate here or should it moved elsewhere ? */ + + i4b_Dcleanifq(&l2sc->i_queue); + + if(l2sc->ua_num != UA_EMPTY) + { + i4b_Dfreembuf(l2sc->ua_frame); + l2sc->ua_num = UA_EMPTY; + } +/*XXX -------------------------------------------------------------- */ + + l2sc->peer_busy = 0; + + l2sc->rej_excpt = 0; + + l2sc->own_busy = 0; + + l2sc->ack_pend = 0; +} + +/*---------------------------------------------------------------------------* + * routine TRANSMIT ENQUIRE (Q.921 03/93 page 83) + *---------------------------------------------------------------------------*/ +void +i4b_transmit_enquire(l2_softc_t *l2sc) +{ + if(l2sc->own_busy) + i4b_tx_rnr_command(l2sc, P1); + else + i4b_tx_rr_command(l2sc, P1); + + l2sc->ack_pend = 0; + + i4b_T200_start(l2sc); +} + +/*---------------------------------------------------------------------------* + * routine NR ERROR RECOVERY (Q.921 03/93 page 83) + *---------------------------------------------------------------------------*/ +void +i4b_nr_error_recovery(l2_softc_t *l2sc) +{ + i4b_mdl_error_ind(l2sc, "i4b_nr_error_recovery", MDL_ERR_J); + + i4b_establish_data_link(l2sc); + + l2sc->l3initiated = 0; +} + +/*---------------------------------------------------------------------------* + * routine ENQUIRY RESPONSE (Q.921 03/93 page 84) + *---------------------------------------------------------------------------*/ +void +i4b_enquiry_response(l2_softc_t *l2sc) +{ + if(l2sc->own_busy) + i4b_tx_rnr_response(l2sc, F1); + else + i4b_tx_rr_response(l2sc, F1); + + l2sc->ack_pend = 0; +} + +/*---------------------------------------------------------------------------* + * routine INVOKE RETRANSMISSION (Q.921 03/93 page 84) + *---------------------------------------------------------------------------*/ +void +i4b_invoke_retransmission(l2_softc_t *l2sc, int nr) +{ + DBGL2(L2_ERROR, "i4b_invoke_retransmission", ("nr = %d\n", nr )); + + while(l2sc->vs != nr) + { + DBGL2(L2_ERROR, "i4b_invoke_retransmission", ("nr != vs, nr = %d, vs = %d\n", nr, l2sc->vs)); + + M128DEC(l2sc->vs); + +/* XXXXXXXXXXXXXXXXX */ + + if((l2sc->ua_num != UA_EMPTY) && (l2sc->vs == l2sc->ua_num)) + { + IF_ENQUEUE(&l2sc->i_queue, l2sc->ua_frame); + l2sc->ua_num = UA_EMPTY; + } + else + { + DBGL2(L2_ERROR, "i4b_invoke_retransmission", ("ERROR, l2sc->vs = %d, l2sc->ua_num = %d \n",l2sc->vs, l2sc->ua_num)); + } + +/* XXXXXXXXXXXXXXXXX */ + + i4b_i_frame_queued_up(l2sc); + } +} + +/*---------------------------------------------------------------------------* + * routine ACKNOWLEDGE PENDING (Q.921 03/93 p 70) + *---------------------------------------------------------------------------*/ +void +i4b_acknowledge_pending(l2_softc_t *l2sc) +{ + if(l2sc->ack_pend) + { + l2sc->ack_pend = 0; + i4b_tx_rr_response(l2sc, F0); + } +} + +/*---------------------------------------------------------------------------* + * i4b_print_frame - just print the hex contents of a frame + *---------------------------------------------------------------------------*/ +void +i4b_print_frame(int len, u_char *buf) +{ +#ifdef DO_I4B_DEBUG + int i; + + if (!(i4b_l2_debug & L2_ERROR)) /* XXXXXXXXXXXXXXXXXXXXX */ + return; + + for(i = 0; i < len; i++) + printf(" 0x%x", buf[i]); + printf("\n"); +#endif +} + +/*---------------------------------------------------------------------------* + * i4b_print_l2var - print some l2softc vars + *---------------------------------------------------------------------------*/ +void +i4b_print_l2var(l2_softc_t *l2sc) +{ + DBGL2(L2_ERROR, "i4b_print_l2var", ("unit%d V(R)=%d, V(S)=%d, V(A)=%d,ACKP=%d,PBSY=%d,OBSY=%d\n", + l2sc->unit, + l2sc->vr, + l2sc->vs, + l2sc->va, + l2sc->ack_pend, + l2sc->peer_busy, + l2sc->own_busy)); +} + +/*---------------------------------------------------------------------------* + * got s or i frame, check if valid ack for last sent frame + *---------------------------------------------------------------------------*/ +void +i4b_rxd_ack(l2_softc_t *l2sc, int nr) +{ + +#ifdef NOTDEF + DBGL2(L2_ERROR, "i4b_rxd_ack", ("N(R)=%d, UA=%d, V(R)=%d, V(S)=%d, V(A)=%d\n", + nr, + l2sc->ua_num, + l2sc->vr, + l2sc->vs, + l2sc->va)); +#endif + + if(l2sc->ua_num != UA_EMPTY) + { + int s; + + M128DEC(nr); + + if(l2sc->ua_num != nr) + DBGL2(L2_ERROR, "i4b_rxd_ack", ("((N(R)-1)=%d) != (UA=%d) !!!\n", nr, l2sc->ua_num)); + + s = SPLI4B(); + + i4b_Dfreembuf(l2sc->ua_frame); + l2sc->ua_num = UA_EMPTY; + + splx(s); + } +} + +/*---------------------------------------------------------------------------* + * if not already active, activate layer 1 + *---------------------------------------------------------------------------*/ +void +i4b_l1_activate(l2_softc_t *l2sc) +{ + if(l2sc->ph_active == PH_INACTIVE) + { + l2sc->ph_active = PH_ACTIVEPEND; + PH_Act_Req(l2sc->unit); + } +}; + +/*---------------------------------------------------------------------------* + * check for v(a) <= n(r) <= v(s) + * nr = receive sequence frame counter, va = acknowledge sequence frame + * counter and vs = transmit sequence frame counter + *---------------------------------------------------------------------------*/ +int +i4b_l2_nr_ok(int nr, int va, int vs) +{ + if((va > nr) && ((nr != 0) || (va != 127))) + { + DBGL2(L2_ERROR, "i4b_l2_nr_ok", ("ERROR, va = %d, nr = %d, vs = %d [1]\n", va, nr, vs)); + return 0; /* fail */ + } + + if((nr > vs) && ((vs != 0) || (nr != 127))) + { + DBGL2(L2_ERROR, "i4b_l2_nr_ok", ("ERROR, va = %d, nr = %d, vs = %d [2]\n", va, nr, vs)); + return 0; /* fail */ + } + + return 1; /* good */ +} + +#endif /* NI4BQ921 > 0 */ + |
