sys/netisdn/i4b_l2.c

   1 /* $NetBSD: i4b_l2.c,v 1.23 2007/07/09 21:11:14 ad Exp $ */
   2
   3 /*
   4  * Copyright (c) 1997, 2000 Hellmuth Michaelis. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  *---------------------------------------------------------------------------
  28  *
  29  *      i4b_l2.c - ISDN layer 2 (Q.921)
  30  *      -------------------------------
  31  *
  32  *      $Id: i4b_l2.c,v 1.24 2008/07/20 01:05:27 martin Exp $
  33  *
  34  * $FreeBSD$
  35  *
  36  *      last edit-date: [Fri Jan  5 11:33:47 2001]
  37  *
  38  *---------------------------------------------------------------------------*/
  39
  40 #include <sys/cdefs.h>
  41 __KERNEL_RCSID(0, "$NetBSD: i4b_l2.c,v 1.23 2007/07/09 21:11:14 ad Exp $");
  42
  43 #ifdef __FreeBSD__
  44 #include "i4bq921.h"
  45 #else
  46 #define NI4BQ921        1
  47 #endif
  48 #if NI4BQ921 > 0
  49
  50 #include <sys/param.h>
  51 #include <sys/kernel.h>
  52 #include <sys/systm.h>
  53 #include <sys/mbuf.h>
  54 #include <sys/socket.h>
  55 #include <net/if.h>
  56
  57 #if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000
  58 #include <sys/callout.h>
  59 #endif
  60
  61 #ifdef __FreeBSD__
  62 #include <machine/i4b_debug.h>
  63 #include <machine/i4b_ioctl.h>
  64 #else
  65 #include <netisdn/i4b_debug.h>
  66 #include <netisdn/i4b_ioctl.h>
  67 #endif
  68
  69 #include <netisdn/i4b_l3l4.h>
  70 #include <netisdn/i4b_l2.h>
  71 #include <netisdn/i4b_l1l2.h>
  72 #include <netisdn/i4b_isdnq931.h>
  73 #include <netisdn/i4b_mbuf.h>
  74 #include <netisdn/i4b_global.h>
  75
  76 #include <netisdn/i4b_l2fsm.h>
  77
  78 /* this layers debug level */
  79
  80 unsigned int i4b_l2_debug = L2_DEBUG_DEFAULT;
  81
  82 /*---------------------------------------------------------------------------*
  83  *      DL_ESTABLISH_REQ from layer 3
  84  *---------------------------------------------------------------------------*/
  85 int i4b_dl_establish_req(l2_softc_t *l2sc, struct isdn_l3_driver *drv)
  86 {
  87         NDBGL2(L2_PRIM, "isdnif %d", l2sc->drv->isdnif);
  88         i4b_l1_activate(l2sc);
  89         i4b_next_l2state(l2sc, drv, EV_DLESTRQ);
  90         return(0);
  91 }
  92
  93 /*---------------------------------------------------------------------------*
  94  *      DL_RELEASE_REQ from layer 3
  95  *---------------------------------------------------------------------------*/
  96 int i4b_dl_release_req(l2_softc_t *l2sc, struct isdn_l3_driver *drv)
  97 {
  98         NDBGL2(L2_PRIM, "isdnif %d", l2sc->drv->isdnif);
  99         i4b_next_l2state(l2sc, drv, EV_DLRELRQ);
 100         return(0);
 101 }
 102
 103 /*---------------------------------------------------------------------------*
 104  *      DL UNIT DATA REQUEST from Layer 3
 105  *---------------------------------------------------------------------------*/
 106 int i4b_dl_unit_data_req(l2_softc_t *l2sc, struct isdn_l3_driver *drv, struct mbuf *m)
 107 {
 108 #ifdef NOTDEF
 109         NDBGL2(L2_PRIM, "isdnif %d", l2sc->isdnif);
 110 #endif
 111         return(0);
 112 }
 113
 114 /*---------------------------------------------------------------------------*
 115  *      DL DATA REQUEST from Layer 3
 116  *---------------------------------------------------------------------------*/
 117 int i4b_dl_data_req(l2_softc_t *l2sc, struct isdn_l3_driver *drv, struct mbuf *m)
 118 {
 119         switch(l2sc->Q921_state)
 120         {
 121                 case ST_AW_EST:
 122                 case ST_MULTIFR:
 123                 case ST_TIMREC:
 124
 125                         if(IF_QFULL(&l2sc->i_queue))
 126                         {
 127                                 NDBGL2(L2_ERROR, "i_queue full!!");
 128                                 i4b_Dfreembuf(m);
 129                         }
 130                         else
 131                         {
 132                                 int s;
 133
 134                                 s = splnet();
 135                                 IF_ENQUEUE(&l2sc->i_queue, m);
 136                                 splx(s);
 137
 138                                 i4b_i_frame_queued_up(l2sc);
 139                         }
 140                         break;
 141
 142                 default:
 143                         NDBGL2(L2_ERROR, "isdnif %d ERROR in state [%s], freeing mbuf", l2sc->drv->isdnif, i4b_print_l2state(l2sc));
 144                         i4b_Dfreembuf(m);
 145                         break;
 146         }
 147         return(0);
 148 }
 149
 150 /*---------------------------------------------------------------------------*
 151  *      isdn_layer2_activate_ind - link activation/deactivation indication from layer 1
 152  *---------------------------------------------------------------------------*/
 153 int
 154 isdn_layer2_activate_ind(struct l2_softc *l2sc, struct isdn_l3_driver *drv, int event_activate)
 155 {
 156         if (event_activate) {
 157                 l2sc->ph_active = PH_ACTIVE;
 158         } else {
 159                 l2sc->ph_active = PH_INACTIVE;
 160         }
 161         return(0);
 162 }
 163
 164 /*---------------------------------------------------------------------------*
 165  *      i4b_l2_unit_init - place layer 2 unit into known state
 166  *---------------------------------------------------------------------------*/
 167 static void
 168 i4b_l2_unit_init(l2_softc_t *l2sc)
 169 {
 170         int s;
 171
 172         s = splnet();
 173         l2sc->Q921_state = ST_TEI_UNAS;
 174         l2sc->tei_valid = TEI_INVALID;
 175         l2sc->vr = 0;
 176         l2sc->vs = 0;
 177         l2sc->va = 0;
 178         l2sc->ack_pend = 0;
 179         l2sc->rej_excpt = 0;
 180         l2sc->peer_busy = 0;
 181         l2sc->own_busy = 0;
 182         l2sc->l3initiated = 0;
 183
 184         l2sc->rxd_CR = 0;
 185         l2sc->rxd_PF = 0;
 186         l2sc->rxd_NR = 0;
 187         l2sc->RC = 0;
 188         l2sc->iframe_sent = 0;
 189
 190         l2sc->postfsmfunc = NULL;
 191
 192         if(l2sc->ua_num != UA_EMPTY)
 193         {
 194                 i4b_Dfreembuf(l2sc->ua_frame);
 195                 l2sc->ua_num = UA_EMPTY;
 196                 l2sc->ua_frame = NULL;
 197         }
 198
 199         i4b_T200_stop(l2sc);
 200         i4b_T202_stop(l2sc);
 201         i4b_T203_stop(l2sc);
 202
 203         splx(s);
 204 }
 205
 206 /*---------------------------------------------------------------------------*
 207  *      isdn_layer2_status_ind - status indication upward
 208  *---------------------------------------------------------------------------*/
 209 int
 210 isdn_layer2_status_ind(l2_softc_t *l2sc, struct isdn_l3_driver *drv, int status, int parm)
 211 {
 212         int s;
 213         int sendup = 1;
 214
 215         s = splnet();
 216
 217         NDBGL2(L2_PRIM, "isdnif %d, status=%d, parm=%d", l2sc->drv->isdnif, status, parm);
 218
 219         switch(status)
 220         {
 221                 case STI_ATTACH:
 222                         if (parm == 0) {
 223                                 /* detach */
 224                                 callout_stop(&l2sc->T200_callout);
 225                                 callout_stop(&l2sc->T202_callout);
 226                                 callout_stop(&l2sc->T203_callout);
 227                                 callout_stop(&l2sc->IFQU_callout);
 228                                 break;
 229                         }
 230
 231                         l2sc->i_queue.ifq_maxlen = IQUEUE_MAXLEN;
 232                         l2sc->ua_frame = NULL;
 233                         memset(&l2sc->stat, 0, sizeof(lapdstat_t));
 234
 235                         /* initialize the callout handles for timeout routines */
 236                         callout_init(&l2sc->T200_callout, 0);
 237                         callout_init(&l2sc->T202_callout, 0);
 238                         callout_init(&l2sc->T203_callout, 0);
 239                         callout_init(&l2sc->IFQU_callout, 0);
 240
 241                         i4b_l2_unit_init(l2sc);
 242                         break;
 243
 244                 case STI_L1STAT:        /* state of layer 1 */
 245                         break;
 246
 247                 case STI_PDEACT:        /* Timer 4 expired */
 248 /*XXX*/                 if((l2sc->Q921_state >= ST_AW_EST) &&
 249                            (l2sc->Q921_state <= ST_TIMREC))
 250                         {
 251                                 NDBGL2(L2_ERROR, "isdnif %d, persistent deactivation!", l2sc->drv->isdnif);
 252                                 i4b_l2_unit_init(l2sc);
 253                                 parm = -1;      /* this is passed as the new
 254                                                  * TEI to upper layers */
 255                         }
 256                         else
 257                         {
 258                                 sendup = 0;
 259                         }
 260                         break;
 261
 262                 case STI_NOL1ACC:
 263                         i4b_l2_unit_init(l2sc);
 264                         NDBGL2(L2_ERROR, "isdnif %d, cannot access S0 bus!", l2sc->drv->isdnif);
 265                         break;
 266
 267                 default:
 268                         NDBGL2(L2_ERROR, "ERROR, isdnif %d, unknown status message!", l2sc->drv->isdnif);
 269                         break;
 270         }
 271
 272         if(sendup)
 273                 i4b_mdl_status_ind(l2sc->drv, status, parm);  /* send up to layer 3 */
 274
 275         splx(s);
 276
 277         return(0);
 278 }
 279
 280 /*---------------------------------------------------------------------------*
 281  *      MDL_COMMAND_REQ from layer 3
 282  *---------------------------------------------------------------------------*/
 283 int i4b_mdl_command_req(struct isdn_l3_driver *drv, int command, void *parm)
 284 {
 285         struct l2_softc *sc = (l2_softc_t*)drv->l1_token;
 286
 287         NDBGL2(L2_PRIM, "isdnif %d, command=%d, parm=%p", drv->isdnif, command, parm);
 288
 289         switch(command)
 290         {
 291                 case CMR_DOPEN:
 292                         i4b_l2_unit_init(sc);
 293                         /* XXX - enable interrupts */
 294                         break;
 295                 case CMR_DCLOSE:
 296                         /* XXX - disable interrupts */
 297                         break;
 298         }
 299
 300         /* pass down to layer 1 driver */
 301         if (sc->driver)
 302                 sc->driver->mph_command_req(sc->l1_token, command, parm);
 303
 304         return(0);
 305 }
 306
 307 /*---------------------------------------------------------------------------*
 308  * isdn_layer2_data_ind - process a rx'd frame got from layer 1
 309  *---------------------------------------------------------------------------*/
 310 int
 311 isdn_layer2_data_ind(l2_softc_t *l2sc, struct isdn_l3_driver *drv, struct mbuf *m)
 312 {
 313         u_char *ptr = m->m_data;
 314
 315         if ( (*(ptr + OFF_CNTL) & 0x01) == 0 )
 316         {
 317                 if(m->m_len < 4)        /* 6 oct - 2 chksum oct */
 318                 {
 319                         l2sc->stat.err_rx_len++;
 320                         NDBGL2(L2_ERROR, "ERROR, I-frame < 6 octetts!");
 321                         i4b_Dfreembuf(m);
 322                         return(0);
 323                 }
 324                 i4b_rxd_i_frame(l2sc, drv, m);
 325         }
 326         else if ( (*(ptr + OFF_CNTL) & 0x03) == 0x01 )
 327         {
 328                 if(m->m_len < 4)        /* 6 oct - 2 chksum oct */
 329                 {
 330                         l2sc->stat.err_rx_len++;
 331                         NDBGL2(L2_ERROR, "ERROR, S-frame < 6 octetts!");
 332                         i4b_Dfreembuf(m);
 333                         return(0);
 334                 }
 335                 i4b_rxd_s_frame(l2sc, drv, m);
 336         }
 337         else if ( (*(ptr + OFF_CNTL) & 0x03) == 0x03 )
 338         {
 339                 if(m->m_len < 3)        /* 5 oct - 2 chksum oct */
 340                 {
 341                         l2sc->stat.err_rx_len++;
 342                         NDBGL2(L2_ERROR, "ERROR, U-frame < 5 octetts!");
 343                         i4b_Dfreembuf(m);
 344                         return(0);
 345                 }
 346                 i4b_rxd_u_frame(l2sc, drv, m);
 347         }
 348         else
 349         {
 350                 l2sc->stat.err_rx_badf++;
 351                 NDBGL2(L2_ERROR, "ERROR, bad frame rx'd - ");
 352                 i4b_print_frame(m->m_len, m->m_data);
 353                 i4b_Dfreembuf(m);
 354         }
 355         return(0);
 356 }
 357
 358 int i4b_l2_channel_get_state(struct isdn_l3_driver *drv, int b_chanid)
 359 {
 360         l2_softc_t *sc = drv->l1_token;
 361         return sc->bchan_state[b_chanid];
 362 }
 363
 364 void i4b_l2_channel_set_state(struct isdn_l3_driver *drv, int b_chanid, int state)
 365 {
 366         l2_softc_t *sc = drv->l1_token;
 367         sc->bchan_state[b_chanid] = state;
 368 }
 369
 370 /*---------------------------------------------------------------------------*
 371  *      telephony silence detection
 372  *---------------------------------------------------------------------------*/
 373
 374 #define TEL_IDLE_MIN (BCH_MAX_DATALEN/2)
 375
 376 int
 377 isdn_bchan_silence(unsigned char *data, int len)
 378 {
 379         register int i = 0;
 380         register int j = 0;
 381
 382         /* count idle bytes */
 383
 384         for(;i < len; i++)
 385         {
 386                 if((*data >= 0xaa) && (*data <= 0xac))
 387                         j++;
 388                 data++;
 389         }
 390
 391 #ifdef NOTDEF
 392         printf("isic_hscx_silence: got %d silence bytes in frame\n", j);
 393 #endif
 394
 395         if(j < (TEL_IDLE_MIN))
 396                 return(0);
 397         else
 398                 return(1);
 399
 400 }
 401
 402
 403 #endif /* NI4BQ921 > 0 */