sys/netisdn/i4b_l2.h

   1 /* $NetBSD: i4b_l2.h,v 1.13 2007/03/04 06:03:31 christos 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.h - ISDN layer 2 (Q.921) definitions
  30  *      ---------------------------------------------
  31  *
  32  *      $Id: i4b_l2.h,v 1.14 2009/03/14 14:46:11 dsl Exp $
  33  *
  34  * $FreeBSD$
  35  *
  36  *      last edit-date: [Sat Mar 18 10:28:22 2000]
  37  *
  38  *---------------------------------------------------------------------------*/
  39
  40 #ifndef _NETISDN_I4B_L2_H_
  41 #define _NETISDN_I4B_L2_H_
  42
  43 typedef struct l2_softc {
  44         const struct isdn_layer1_isdnif_driver * driver;
  45         void*   l1_token;
  46         struct isdn_l3_driver *drv;
  47
  48         int     Q921_state;     /* state according to Q.921 */
  49
  50         u_char  last_ril;       /* last reference number from TEI management */
  51         u_char  last_rih;
  52
  53         int     tei_valid;      /* tei is valid flag */
  54 #define TEI_INVALID     0
  55 #define TEI_VALID       1
  56         int     tei;            /* tei, if tei flag valid */
  57
  58         int     ph_active;      /* Layer 1 active flag */
  59 #define PH_INACTIVE     0       /* layer 1 inactive */
  60 #define PH_ACTIVEPEND   1       /* already tried to activate */
  61 #define PH_ACTIVE       2       /* layer 1 active */
  62
  63         int     T200;           /* Multiframe timeout timer */
  64         int     T201;           /* min time between TEI ID check */
  65         int     T202;           /* min time between TEI ID Req messages */
  66         int     N202;           /* TEI ID Req tx counter */
  67         void(*T202func)(void *);/* function to be called when T202 expires */
  68         int     T203;           /* max line idle time */
  69         struct  callout T200_callout;
  70         struct  callout T202_callout;
  71         struct  callout T203_callout;
  72         struct  callout IFQU_callout;
  73
  74 /*
  75  * i4b_iframe.c, i4b_i_frame_queued_up(): value of IFQU_DLY
  76  * some experimentation Gary did showed a minimal value of (hz/20) was
  77  * possible to let this work, Gary suggested using (hz/10) but i settled
  78  * down to using (hz/5) for now (-hm).
  79  */
  80 #define IFQU_DLY (hz/5)         /* reschedule I-FRAME-QUEUED-UP 0.2 sec */
  81
  82         int     vr;             /* receive sequence frame counter */
  83         int     vs;             /* transmit sequence frame counter */
  84         int     va;             /* acknowledge sequence frame counter */
  85
  86         int     ack_pend;       /* acknowledge pending */
  87         int     rej_excpt;      /* reject exception */
  88         int     peer_busy;      /* peer receiver busy */
  89         int     own_busy;       /* own receiver busy */
  90         int     l3initiated;    /* layer 3 initiated */
  91
  92         int     bchan_state[2];
  93
  94         struct ifqueue i_queue; /* queue of outgoing i frames */
  95 #define IQUEUE_MAXLEN   20
  96
  97         /* this implementation only supports a k-value of 1 !!! */
  98         struct mbuf *ua_frame;  /* last unacked frame */
  99         int     ua_num;         /* last unacked frame number */
 100 #define UA_EMPTY (-1)           /* ua_frame is unused   */
 101
 102         int     rxd_CR;         /* received Command Response bit */
 103         int     rxd_PF;         /* received Poll/Final bit */
 104         int     rxd_NR;         /* received N(R) field */
 105         int     RC;             /* Retry Counter */
 106
 107         int     iframe_sent;    /* check if i frame acked by another i frame */
 108
 109         int (*postfsmfunc)(struct isdn_l3_driver *drv);/* function to be called at fsm exit */
 110         struct isdn_l3_driver *postfsmarg;      /* argument for above function */
 111
 112         /* statistics */
 113
 114         lapdstat_t      stat;   /* lapd protocol statistics */
 115
 116 } l2_softc_t;
 117
 118 /* Q.912 system parameters (Q.921 03/93 pp 43) */
 119
 120 #define MAX_K_VALUE     1       /* BRI - # of outstanding frames        */
 121
 122 #define N200    3               /* max no of retransmissions */
 123 #define N201DEF 260             /* max no of octetts in information field */
 124 #define N202DEF 3               /* max no of TEI ID Request message transmissions */
 125
 126 #define T200DEF (hz*1)          /* default T200 timer value = 1 second  */
 127 #define T201DEF T200DEF         /* default T201 timer value = T200DEF   */
 128 #define T202DEF (hz*2)          /* default T202 timer value = 2 seconds */
 129 #define T203DEF (hz*10)         /* default T203 timer value = 10 seconds*/
 130
 131 /* modulo 128 operations */
 132
 133 #define M128INC(v)      (v)++;          \
 134                         if((v)>127)     \
 135                         {               \
 136                                 v = 0;  \
 137                         }
 138
 139 #define M128DEC(v)      (v)--;          \
 140                         if((v)<0)       \
 141                         {               \
 142                                 v = 127;\
 143                         }
 144
 145 /* P-bit values */
 146
 147 typedef enum {
 148         P0,
 149         P1
 150 } pbit_t;
 151
 152 /* F-bit values */
 153
 154 typedef enum {
 155         F0,
 156         F1
 157 } fbit_t;
 158
 159 /* CR-bit values to NT */
 160
 161 typedef enum {
 162         CR_CMD_TO_NT,
 163         CR_RSP_TO_NT
 164 } crbit_to_nt_t;
 165
 166 /* CR-bit values from NT */
 167
 168 typedef enum {
 169         CR_RSP_FROM_NT,
 170         CR_CMD_FROM_NT
 171 } crbit_from_nt_t;
 172
 173 /* address field - octett 2 */
 174
 175 #define OFF_SAPI        0       /* SAPI offset, HDLC flag is eaten by L1 */
 176 #define SAPI_CCP        0       /* SAPI = 0 - call control procedures */
 177 #define SAPI_X25        16      /* SAPI = 16 - X.25 packet procedures */
 178 #define SAPI_L2M        63      /* SAPI = 63 - Layer 2 management procedures */
 179
 180 /* extract and insert macros for SAPI octett */
 181
 182 #define GETSAPI(octett)         (((octett) >> 2) & 0x3f)
 183 #define PUTSAPI(sapi,cr,octett) ((octett) = (((sapi << 2) & 0xfc) | ((cr & 0x01) << 1)))
 184 #define GETCR(octett)           (((octett) >> 1) & 0x01)
 185 #define GETEA(octett)           ((octett) & 0x01)
 186
 187 /* address field - octett 3 */
 188
 189 #define OFF_TEI         1       /* TEI offset */
 190 #define GETTEI(octett) (((octett) >> 1) & 0x7f)
 191 #define PUTTEI(tei, octett) ((octett) = ((((tei) << 1) & 0xfe)) | 0x01)
 192 #define GROUP_TEI       127     /* broadcast TEI for LME */
 193
 194 /* control field - octett 4 */
 195
 196 #define OFF_CNTL        2       /* 1st byte of control field */
 197
 198 /* S frames */
 199
 200 #define S_FRAME_LEN     4       /* length of a U-frame */
 201 #define OFF_SRCR        2       /* 1st byte of control field,   */
 202                                 /* R-commands and R-responses   */
 203 #define OFF_SNR         3       /* 2nd byte of control field, N(R) and PF */
 204 #define SPFBIT          0x01    /* poll/final bit mask */
 205 #define SPBITSET        SPFBIT
 206 #define SFBITSET        SPFBIT
 207 #define GETSNR(octett) (((octett) >> 1) & 0x7f)
 208 #define GETSPF(octett) ((octett) & SPFBIT)
 209 #define RR              0x01    /* RR and bit 0 set */
 210 #define RNR             0x05    /* RNR and bit 0 set */
 211 #define REJ             0x09    /* REJ and bit 0 set */
 212
 213 /* U frames */
 214
 215 #define UI_HDR_LEN      3       /* length of UI header in front of L3 frame */
 216 #define U_FRAME_LEN     3       /* length of a U-frame */
 217 #define UPFBIT          0x10    /* poll/final bit mask */
 218 #define UPBITSET        UPFBIT
 219 #define UFBITSET        UPFBIT
 220 #define GETUPF(octett) (((octett) >> 4) & 0x01)
 221
 222 /* commands/responses with pf bit set to 0 */
 223
 224 #define SABME           0x6f
 225 #define DM              0x0f
 226 #define UI              0x03
 227 #define DISC            0x43
 228 #define UA              0x63
 229 #define FRMR            0x87
 230 #define XID             0xaf
 231
 232 /* control field - octett 3 */
 233
 234 #define OFF_MEI         3       /* 2nd byte of control field */
 235
 236 /* control field - octett 4,5 */
 237
 238 #define OFF_RIL         4       /* Ri low byte */
 239 #define OFF_RIH         5       /* Ri high byte */
 240
 241 /* control field - octett 6 */
 242
 243 #define OFF_MT          6       /* Message Type */
 244 #define OFF_AI          7       /* Action Indicator  */
 245 #define GET_TEIFROMAI(octett) (((octett) >> 1) & 0x7f)
 246
 247 /* I frame */
 248
 249 #define I_HDR_LEN       4       /* length of I header in front of L3 frame */
 250 #define OFF_INS         2       /* transmit sequence number */
 251 #define OFF_INR         3       /* receive sequence number */
 252 #define IPFBIT          0x01    /* poll/final bit mask */
 253 #define IPBITSET        0x01
 254 #define GETINR(octett)  (((octett) >> 1) & 0x7f)
 255 #define GETINS(octett)  (((octett) >> 1) & 0x7f)
 256 #define GETIP(octett)   ((octett) & IPFBIT)
 257
 258 /* structure of a TEI management frame */
 259
 260 #define TEI_MGMT_FRM_LEN   8            /* frame length */
 261 #define TEIM_SAPIO      0x00            /* SAPI, CR, EA */
 262 #define TEIM_TEIO       0x01            /* TEI, EA */
 263 #define TEIM_UIO        0x02            /* frame type = UI = 0x03 */
 264 #define TEIM_MEIO       0x03            /* management entity id = 0x0f */
 265 #define         MEI     0x0f
 266 #define TEIM_RILO       0x04            /* reference number, low  */
 267 #define TEIM_RIHO       0x05            /* reference number, high */
 268 #define TEIM_MTO        0x06            /* message type */
 269 #define         MT_ID_REQEST    0x01
 270 #define         MT_ID_ASSIGN    0x02
 271 #define         MT_ID_DENY      0x03
 272 #define         MT_ID_CHK_REQ   0x04
 273 #define         MT_ID_CHK_RSP   0x05
 274 #define         MT_ID_REMOVE    0x06
 275 #define         MT_ID_VERIFY    0x07
 276 #define TEIM_AIO        0x07            /* action indicator */
 277
 278 /* i4b_mdl_error_ind codes */
 279
 280 enum MDL_ERROR_CODES {
 281         MDL_ERR_A,
 282         MDL_ERR_B,
 283         MDL_ERR_C,
 284         MDL_ERR_D,
 285         MDL_ERR_E,
 286         MDL_ERR_F,
 287         MDL_ERR_G,
 288         MDL_ERR_H,
 289         MDL_ERR_I,
 290         MDL_ERR_J,
 291         MDL_ERR_K,
 292         MDL_ERR_L,
 293         MDL_ERR_M,
 294         MDL_ERR_N,
 295         MDL_ERR_O,
 296         MDL_ERR_MAX
 297 };
 298
 299 /* forward decl */
 300 struct isdn_l3_driver;
 301 extern void i4b_acknowledge_pending ( l2_softc_t *l2sc );
 302 extern struct mbuf * i4b_build_s_frame ( l2_softc_t *l2sc, crbit_to_nt_t crbit, pbit_t pbit, u_char type );
 303 extern struct mbuf * i4b_build_u_frame ( l2_softc_t *l2sc, crbit_to_nt_t crbit, pbit_t pbit, u_char type );
 304 extern void i4b_clear_exception_conditions ( l2_softc_t *l2sc );
 305 extern int i4b_dl_data_req ( l2_softc_t*, struct isdn_l3_driver *drv, struct mbuf *m );
 306 extern int i4b_dl_establish_req ( l2_softc_t*, struct isdn_l3_driver *drv );
 307 extern int i4b_dl_release_req ( l2_softc_t*, struct isdn_l3_driver *drv );
 308 extern int i4b_dl_unit_data_req ( l2_softc_t*, struct isdn_l3_driver *drv, struct mbuf *m );
 309 extern void i4b_enquiry_response ( l2_softc_t *l2sc );
 310 extern void i4b_establish_data_link ( l2_softc_t *l2sc );
 311 extern void i4b_invoke_retransmission ( l2_softc_t *l2sc, int nr );
 312 extern void i4b_i_frame_queued_up ( l2_softc_t *l2sc );
 313 extern void i4b_l1_activate ( l2_softc_t *l2sc );
 314 extern int i4b_l2_nr_ok ( int nr, int va, int vs );
 315 extern void i4b_make_rand_ri ( l2_softc_t *l2sc );
 316 extern void i4b_mdl_assign_ind ( l2_softc_t *l2sc );
 317 extern void i4b_mdl_error_ind ( l2_softc_t *l2sc, const char *where, int errorcode );
 318 extern void i4b_next_l2state ( l2_softc_t *l2sc, struct isdn_l3_driver *drv, int event );
 319 extern void i4b_nr_error_recovery ( l2_softc_t *l2sc );
 320 extern int i4b_ph_activate_ind ( l2_softc_t* );
 321 extern int i4b_ph_deactivate_ind ( l2_softc_t* );
 322 extern void i4b_print_frame ( int len, u_char *buf );
 323 extern const char *i4b_print_l2state ( l2_softc_t *l2sc );
 324 extern void i4b_print_l2var ( l2_softc_t *l2sc );
 325 extern void i4b_rxd_ack(l2_softc_t *l2sc, struct isdn_l3_driver *drv, int nr);
 326 extern void i4b_rxd_i_frame ( l2_softc_t *, struct isdn_l3_driver *drv, struct mbuf *m );
 327 extern void i4b_rxd_s_frame ( l2_softc_t *, struct isdn_l3_driver *drv, struct mbuf *m );
 328 extern void i4b_rxd_u_frame ( l2_softc_t *, struct isdn_l3_driver *drv, struct mbuf *m );
 329 extern void i4b_T200_restart ( l2_softc_t *l2sc );
 330 extern void i4b_T200_start ( l2_softc_t *l2sc );
 331 extern void i4b_T200_stop ( l2_softc_t *l2sc );
 332 extern void i4b_T202_start ( l2_softc_t *l2sc );
 333 extern void i4b_T202_stop ( l2_softc_t *l2sc );
 334 extern void i4b_T203_restart ( l2_softc_t *l2sc );
 335 extern void i4b_T203_start ( l2_softc_t *l2sc );
 336 extern void i4b_T203_stop ( l2_softc_t *l2sc );
 337 extern void i4b_tei_assign ( l2_softc_t *l2sc );
 338 extern void i4b_tei_chkresp ( l2_softc_t *l2sc );
 339 extern void i4b_tei_rxframe ( l2_softc_t *, struct isdn_l3_driver *, struct mbuf *m );
 340 extern void i4b_tei_verify ( l2_softc_t *l2sc );
 341 extern void i4b_transmit_enquire ( l2_softc_t *l2sc );
 342 extern void i4b_tx_disc ( l2_softc_t *l2sc, pbit_t pbit );
 343 extern void i4b_tx_dm ( l2_softc_t *l2sc, fbit_t fbit );
 344 extern void i4b_tx_frmr ( l2_softc_t *l2sc, fbit_t fbit );
 345 extern void i4b_tx_rej_response ( l2_softc_t *l2sc, fbit_t fbit );
 346 extern void i4b_tx_rnr_command ( l2_softc_t *l2sc, pbit_t pbit );
 347 extern void i4b_tx_rnr_response ( l2_softc_t *l2sc, fbit_t fbit );
 348 extern void i4b_tx_rr_command ( l2_softc_t *l2sc, pbit_t pbit );
 349 extern void i4b_tx_rr_response ( l2_softc_t *l2sc, fbit_t fbit );
 350 extern void i4b_tx_sabme ( l2_softc_t *l2sc, pbit_t pbit );
 351 extern void i4b_tx_ua ( l2_softc_t *l2sc, fbit_t fbit );
 352
 353 struct isdn_l3_driver;
 354 extern int i4b_l2_channel_get_state(struct isdn_l3_driver *drv, int b_chanid);
 355 extern void i4b_l2_channel_set_state(struct isdn_l3_driver *drv, int b_chanid, int state);
 356 extern int i4b_mdl_status_ind ( struct isdn_l3_driver *drv, int status, int parm);
 357 extern int i4b_dl_release_ind ( struct isdn_l3_driver *drv );
 358 extern int i4b_dl_establish_ind ( struct isdn_l3_driver *drv );
 359 extern int i4b_dl_release_cnf ( struct isdn_l3_driver *drv );
 360 extern int i4b_dl_establish_cnf ( struct isdn_l3_driver *drv );
 361 extern int i4b_dl_unit_data_ind ( struct isdn_l3_driver *drv, struct mbuf *m );
 362 extern int i4b_dl_data_ind ( struct isdn_l3_driver *drv, struct mbuf *m );
 363 int i4b_mdl_command_req(struct isdn_l3_driver *drv, int, void *);
 364 void *isdn_find_softc_by_isdnif(int isdnif);
 365 extern int isdn_bchan_silence( unsigned char *data, int len );
 366
 367 #endif /* !_NETISDN_I4B_L2_H_ */