/* * Copyright (c) 1997, 1999 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_l2.c - ISDN layer 2 (Q.921) * ------------------------------- * * $Id: i4b_l2.c,v 1.30 1999/12/13 21:25:27 hm Exp $ * * $FreeBSD$ * * last edit-date: [Mon Dec 13 22:03:23 1999] * *---------------------------------------------------------------------------*/ #ifdef __FreeBSD__ #include "i4bq921.h" #else #define NI4BQ921 1 #endif #if NI4BQ921 > 0 #include #if defined(__FreeBSD__) #include #else #include #endif #include #include #include #include #ifdef __FreeBSD__ #include #include #else #include #include #endif #include #include #include #include #include #include #include int i4b_dl_establish_ind(int); int i4b_dl_establish_cnf(int); int i4b_dl_release_ind(int); int i4b_dl_release_cnf(int); int i4b_dl_data_ind(int, struct mbuf *); int i4b_dl_unit_data_ind(int, struct mbuf *); static int i4b_mdl_command_req(int, int, int); /* from layer 2 */ extern int i4b_mdl_attach_ind(int, int); extern int i4b_mdl_status_ind(int, int, int); /* this layers debug level */ unsigned int i4b_l2_debug = L2_DEBUG_DEFAULT; struct i4b_l2l3_func i4b_l2l3_func = { /* Layer 2 --> Layer 3 */ (int (*)(int)) i4b_dl_establish_ind, (int (*)(int)) i4b_dl_establish_cnf, (int (*)(int)) i4b_dl_release_ind, (int (*)(int)) i4b_dl_release_cnf, (int (*)(int, struct mbuf *)) i4b_dl_data_ind, (int (*)(int, struct mbuf *)) i4b_dl_unit_data_ind, /* Layer 3 --> Layer 2 */ (int (*)(int)) i4b_dl_establish_req, (int (*)(int)) i4b_dl_release_req, (int (*)(int, struct mbuf *)) i4b_dl_data_req, (int (*)(int, struct mbuf *)) i4b_dl_unit_data_req, /* Layer 2 --> Layer 3 management */ (int (*)(int, int, int)) i4b_mdl_status_ind, /* Layer 3 --> Layer 2 management */ (int (*)(int, int, int)) i4b_mdl_command_req }; /*---------------------------------------------------------------------------* * DL_ESTABLISH_REQ from layer 3 *---------------------------------------------------------------------------*/ int i4b_dl_establish_req(int unit) { l2_softc_t *l2sc = &l2_softc[unit]; DBGL2(L2_PRIM, "DL-ESTABLISH-REQ", ("unit %d\n",unit)); i4b_l1_activate(l2sc); i4b_next_l2state(l2sc, EV_DLESTRQ); return(0); } /*---------------------------------------------------------------------------* * DL_RELEASE_REQ from layer 3 *---------------------------------------------------------------------------*/ int i4b_dl_release_req(int unit) { l2_softc_t *l2sc = &l2_softc[unit]; DBGL2(L2_PRIM, "DL-RELEASE-REQ", ("unit %d\n",unit)); i4b_next_l2state(l2sc, EV_DLRELRQ); return(0); } /*---------------------------------------------------------------------------* * DL UNIT DATA REQUEST from Layer 3 *---------------------------------------------------------------------------*/ int i4b_dl_unit_data_req(int unit, struct mbuf *m) { #ifdef NOTDEF DBGL2(L2_PRIM, "DL-UNIT-DATA-REQ", ("unit %d\n",unit)); #endif return(0); } /*---------------------------------------------------------------------------* * DL DATA REQUEST from Layer 3 *---------------------------------------------------------------------------*/ int i4b_dl_data_req(int unit, struct mbuf *m) { l2_softc_t *l2sc = &l2_softc[unit]; #ifdef NOTDEF DBGL2(L2_PRIM, "DL-DATA-REQ", ("unit %d\n",unit)); #endif switch(l2sc->Q921_state) { case ST_AW_EST: case ST_MULTIFR: case ST_TIMREC: if(IF_QFULL(&l2sc->i_queue)) { DBGL2(L2_ERROR, "i4b_dl_data_req", ("i_queue full!!\n")); i4b_Dfreembuf(m); } else { CRIT_VAR; CRIT_BEG; IF_ENQUEUE(&l2sc->i_queue, m); CRIT_END; i4b_i_frame_queued_up(l2sc); } break; default: DBGL2(L2_ERROR, "i4b_dl_data_req", ("unit %d ERROR in state [%s], freeing mbuf\n", unit, i4b_print_l2state(l2sc))); i4b_Dfreembuf(m); break; } return(0); } /*---------------------------------------------------------------------------* * i4b_ph_activate_ind - link activation indication from layer 1 *---------------------------------------------------------------------------*/ int i4b_ph_activate_ind(int unit) { l2_softc_t *l2sc = &l2_softc[unit]; DBGL1(L1_PRIM, "PH-ACTIVATE-IND", ("unit %d\n",unit)); l2sc->ph_active = PH_ACTIVE; return(0); } /*---------------------------------------------------------------------------* * i4b_ph_deactivate_ind - link deactivation indication from layer 1 *---------------------------------------------------------------------------*/ int i4b_ph_deactivate_ind(int unit) { l2_softc_t *l2sc = &l2_softc[unit]; DBGL1(L1_PRIM, "PH-DEACTIVATE-IND", ("unit %d\n",unit)); l2sc->ph_active = PH_INACTIVE; return(0); } /*---------------------------------------------------------------------------* * i4b_l2_unit_init - place layer 2 unit into known state *---------------------------------------------------------------------------*/ static void i4b_l2_unit_init(int unit) { l2_softc_t *l2sc = &l2_softc[unit]; CRIT_VAR; CRIT_BEG; l2sc->Q921_state = ST_TEI_UNAS; l2sc->tei_valid = TEI_INVALID; l2sc->vr = 0; l2sc->vs = 0; l2sc->va = 0; l2sc->ack_pend = 0; l2sc->rej_excpt = 0; l2sc->peer_busy = 0; l2sc->own_busy = 0; l2sc->l3initiated = 0; l2sc->rxd_CR = 0; l2sc->rxd_PF = 0; l2sc->rxd_NR = 0; l2sc->RC = 0; l2sc->iframe_sent = 0; l2sc->postfsmfunc = NULL; if(l2sc->ua_num != UA_EMPTY) { i4b_Dfreembuf(l2sc->ua_frame); l2sc->ua_num = UA_EMPTY; l2sc->ua_frame = NULL; } i4b_T200_stop(l2sc); i4b_T202_stop(l2sc); i4b_T203_stop(l2sc); CRIT_END; } /*---------------------------------------------------------------------------* * i4b_mph_status_ind - status indication upward *---------------------------------------------------------------------------*/ int i4b_mph_status_ind(int unit, int status, int parm) { l2_softc_t *l2sc = &l2_softc[unit]; CRIT_VAR; int sendup = 1; CRIT_BEG; DBGL1(L1_PRIM, "MPH-STATUS-IND", ("unit %d, status=%d, parm=%d\n", unit, status, parm)); switch(status) { case STI_ATTACH: l2sc->unit = unit; l2sc->i_queue.ifq_maxlen = IQUEUE_MAXLEN; l2sc->ua_frame = NULL; bzero(&l2sc->stat, sizeof(lapdstat_t)); i4b_l2_unit_init(unit); #if defined(__FreeBSD__) /* initialize the callout handles for timeout routines */ callout_handle_init(&l2sc->T200_callout); callout_handle_init(&l2sc->T202_callout); callout_handle_init(&l2sc->T203_callout); callout_handle_init(&l2sc->IFQU_callout); #endif break; case STI_L1STAT: /* state of layer 1 */ break; case STI_PDEACT: /* Timer 4 expired */ /*XXX*/ if((l2sc->Q921_state >= ST_AW_EST) && (l2sc->Q921_state <= ST_TIMREC)) { DBGL2(L2_ERROR, "i4b_mph_status_ind", ("unit %d, persistent deactivation!\n", unit)); i4b_l2_unit_init(unit); } else { sendup = 0; } break; case STI_NOL1ACC: i4b_l2_unit_init(unit); DBGL2(L2_ERROR, "i4b_mph_status_ind", ("unit %d, cannot access S0 bus!\n", unit)); break; default: DBGL2(L2_ERROR, "i4b_mph_status_ind", ("ERROR, unit %d, unknown status message!\n", unit)); break; } if(sendup) MDL_Status_Ind(unit, status, parm); /* send up to layer 3 */ CRIT_END; return(0); } /*---------------------------------------------------------------------------* * MDL_COMMAND_REQ from layer 3 *---------------------------------------------------------------------------*/ int i4b_mdl_command_req(int unit, int command, int parm) { DBGL2(L2_PRIM, "MDL-COMMAND-REQ", ("unit %d, command=%d, parm=%d\n", unit, command, parm)); switch(command) { case CMR_DOPEN: i4b_l2_unit_init(unit); break; } MPH_Command_Req(unit, command, parm); return(0); } /*---------------------------------------------------------------------------* * i4b_ph_data_ind - process a rx'd frame got from layer 1 *---------------------------------------------------------------------------*/ int i4b_ph_data_ind(int unit, struct mbuf *m) { l2_softc_t *l2sc = &l2_softc[unit]; #ifdef NOTDEF DBGL1(L1_PRIM, "PH-DATA-IND", ("unit %d\n", unit)); #endif u_char *ptr = m->m_data; if ( (*(ptr + OFF_CNTL) & 0x01) == 0 ) { if(m->m_len < 4) /* 6 oct - 2 chksum oct */ { l2sc->stat.err_rx_len++; DBGL2(L2_ERROR, "i4b_ph_data_ind", ("ERROR, I-frame < 6 octetts!\n")); i4b_Dfreembuf(m); return(0); } i4b_rxd_i_frame(unit, m); } else if ( (*(ptr + OFF_CNTL) & 0x03) == 0x01 ) { if(m->m_len < 4) /* 6 oct - 2 chksum oct */ { l2sc->stat.err_rx_len++; DBGL2(L2_ERROR, "i4b_ph_data_ind", ("ERROR, S-frame < 6 octetts!\n")); i4b_Dfreembuf(m); return(0); } i4b_rxd_s_frame(unit, m); } else if ( (*(ptr + OFF_CNTL) & 0x03) == 0x03 ) { if(m->m_len < 3) /* 5 oct - 2 chksum oct */ { l2sc->stat.err_rx_len++; DBGL2(L2_ERROR, "i4b_ph_data_ind", ("ERROR, U-frame < 5 octetts!\n")); i4b_Dfreembuf(m); return(0); } i4b_rxd_u_frame(unit, m); } else { l2sc->stat.err_rx_badf++; DBGL2(L2_ERROR, "i4b_ph_data_ind", ("ERROR, bad frame rx'd - ")); i4b_print_frame(m->m_len, m->m_data); i4b_Dfreembuf(m); } return(0); } #endif /* NI4BQ921 > 0 */