diff options
Diffstat (limited to 'sys/i4b/layer2/i4b_iframe.c')
| -rw-r--r-- | sys/i4b/layer2/i4b_iframe.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/sys/i4b/layer2/i4b_iframe.c b/sys/i4b/layer2/i4b_iframe.c new file mode 100644 index 0000000..c5e38d8 --- /dev/null +++ b/sys/i4b/layer2/i4b_iframe.c @@ -0,0 +1,275 @@ +/* + * 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_iframe.c - i frame handling routines + * ------------------------------------------ + * + * $Id: i4b_iframe.c,v 1.15 1998/12/05 18:05:06 hm Exp $ + * + * last edit-date: [Sat Dec 5 18:26:16 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> +#include <machine/i4b_trace.h> +#else +#include <i4b/i4b_debug.h> +#include <i4b/i4b_ioctl.h> +#include <i4b/i4b_trace.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> + +/*---------------------------------------------------------------------------* + * process i frame + * implements the routine "I COMMAND" Q.921 03/93 pp 77 + *---------------------------------------------------------------------------*/ +void +i4b_rxd_i_frame(int unit, struct mbuf *m) +{ + l2_softc_t *l2sc = &l2_softc[unit]; + u_char *ptr = m->m_data; + int nr; + int ns; + int p; + int x; + + if(!((l2sc->tei_valid == TEI_VALID) && + (l2sc->tei == GETTEI(*(ptr+OFF_TEI))))) + { + i4b_Dfreembuf(m); + return; + } + + if((l2sc->Q921_state != ST_MULTIFR) && (l2sc->Q921_state != ST_TIMREC)) + { + i4b_Dfreembuf(m); + DBGL2(L2_I_ERR, "i4b_rxd_i_frame", ("ERROR, state != (MF || TR)!\n")); + return; + } + + x = SPLI4B(); + + nr = GETINR(*(ptr + OFF_INR)); + ns = GETINS(*(ptr + OFF_INS)); + p = GETIP(*(ptr + OFF_INR)); + + i4b_rxd_ack(l2sc, nr); /* last packet ack */ + + if(l2sc->own_busy) /* own receiver busy ? */ + { + i4b_Dfreembuf(m); /* yes, discard information */ + + if(p == 1) /* P bit == 1 ? */ + { + i4b_tx_rnr_response(l2sc, p); /* yes, tx RNR */ + l2sc->ack_pend = 0; /* clear ACK pending */ + } + } + else /* own receiver ready */ + { + if(ns == l2sc->vr) /* expected sequence number ? */ + { + M128INC(l2sc->vr); /* yes, update */ + + l2sc->rej_excpt = 0; /* clr reject exception */ + + m_adj(m, I_HDR_LEN); /* strip i frame header */ + + l2sc->iframe_sent = 0; /* reset i acked already */ + + DL_Data_Ind(l2sc->unit, m); /* pass data up */ + + if(!l2sc->iframe_sent) + { + i4b_tx_rr_response(l2sc, p); /* yes, tx RR */ + l2sc->ack_pend = 0; /* clr ACK pending */ + } + } + else /* ERROR, sequence number NOT expected */ + { + i4b_Dfreembuf(m); /* discard information */ + + if(l2sc->rej_excpt == 1) /* already exception ? */ + { + if(p == 1) /* immediate response ? */ + { + i4b_tx_rr_response(l2sc, p); /* yes, tx RR */ + l2sc->ack_pend = 0; /* clr ack pend */ + } + } + else /* not in exception cond */ + { + l2sc->rej_excpt = 1; /* set exception */ + i4b_tx_rej_response(l2sc, p); /* tx REJ */ + l2sc->ack_pend = 0; /* clr ack pending */ + } + } + } + + /* sequence number ranges as expected ? */ + + if(i4b_l2_nr_ok(nr, l2sc->va, l2sc->vs)) + { + if(l2sc->Q921_state == ST_TIMREC) + { + l2sc->va = nr; + splx(x); + return; + } + + if(l2sc->peer_busy) /* yes, other side busy ? */ + { + l2sc->va = nr; /* yes, update ack count */ + } + else /* other side ready */ + { + if(nr == l2sc->vs) /* count expected ? */ + { + l2sc->va = nr; /* update ack */ + i4b_T200_stop(l2sc); + i4b_T203_restart(l2sc); + } + else + { + if(nr != l2sc->va) + { + l2sc->va = nr; + i4b_T200_restart(l2sc); + } + } + } + } + else + { + i4b_nr_error_recovery(l2sc); /* sequence error */ + l2sc->Q921_state = ST_AW_EST; + } + splx(x); +} + +/*---------------------------------------------------------------------------* + * internal I FRAME QUEUED UP routine (Q.921 03/93 p 61) + *---------------------------------------------------------------------------*/ +void +i4b_i_frame_queued_up(l2_softc_t *l2sc) +{ + int x; + struct mbuf *m; + u_char *ptr; + + x = SPLI4B(); + + if(l2sc->peer_busy) + { + DBGL2(L2_I_MSG, "i4b_i_frame_queued_up", ("peer busy!\n")); + i4b_print_l2var(l2sc); + splx(x); + return; + } + + if(l2sc->vs == ((l2sc->va + MAX_K_VALUE) & 127)) + { + DBGL2(L2_I_ERR, "i4b_i_frame_queued_up", ("V(S) == ((V(A) + k) & 127)!\n")); + DBGL2(L2_I_ERR, "i4b_i_frame_queued_up", ("state = %s\n", i4b_print_l2state(l2sc))); + i4b_print_l2var(l2sc); + splx(x); + return; + } + + IF_DEQUEUE(&l2sc->i_queue, m); /* fetch next frame to tx */ + + if(!m) + { + DBGL2(L2_I_ERR, "i4b_i_frame_queued_up", ("ERROR, mbuf NULL after IF_DEQUEUE\n")); + splx(x); + return; + } + + ptr = m->m_data; + + PUTSAPI(SAPI_CCP, CR_CMD_TO_NT, *(ptr + OFF_SAPI)); + PUTTEI(l2sc->tei, *(ptr + OFF_TEI)); + + *(ptr + OFF_INS) = (l2sc->vs << 1) & 0xfe; /* bit 0 = 0 */ + *(ptr + OFF_INR) = (l2sc->vr << 1) & 0xfe; /* P bit = 0 */ + + PH_Data_Req(l2sc->unit, m, MBUF_DONTFREE); /* free'd when ack'd ! */ + + l2sc->iframe_sent = 1; /* in case we ack an I frame with another I frame */ + + if(l2sc->ua_num != UA_EMPTY) /* failsafe */ + { + DBGL2(L2_I_ERR, "i4b_i_frame_queued_up", ("ERROR, l2sc->ua_num: %d != UA_EMPTY\n", l2sc->ua_num)); + i4b_print_l2var(l2sc); + i4b_Dfreembuf(l2sc->ua_frame); + } + + l2sc->ua_frame = m; /* save unacked frame */ + l2sc->ua_num = l2sc->vs; /* save frame number */ + + M128INC(l2sc->vs); + + l2sc->ack_pend = 0; + + splx(x); + + if(l2sc->T200 == TIMER_IDLE) + { + i4b_T203_stop(l2sc); + i4b_T200_start(l2sc); + } +} + +#endif /* NI4BQ921 > 0 */ |
