/* * 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.h - ISDN layer 2 (Q.921) definitions * --------------------------------------------- * * $Id: i4b_l2.h,v 1.15 1999/02/14 09:45:00 hm Exp $ * * last edit-date: [Sun Feb 14 10:31:31 1999] * *---------------------------------------------------------------------------*/ #ifndef _I4B_L2_H_ #define _I4B_L2_H_ typedef struct { int unit; /* unit number this entry is for */ int Q921_state; /* state according to Q.921 */ u_char last_ril; /* last reference number from TEI management */ u_char last_rih; int tei_valid; /* tei is valid flag */ #define TEI_INVALID 0 #define TEI_VALID 1 int tei; /* tei, if tei flag valid */ int ph_active; /* Layer 1 active flag */ #define PH_INACTIVE 0 /* layer 1 inactive */ #define PH_ACTIVEPEND 1 /* already tried to activate */ #define PH_ACTIVE 2 /* layer 1 active */ int T200; /* Multiframe timeout timer */ int T201; /* min time between TEI ID check */ int T202; /* min time between TEI ID Req messages */ int N202; /* TEI ID Req tx counter */ void(*T202func)(void *);/* function to be called when T202 expires */ int T203; /* max line idle time */ #if defined(__FreeBSD_version) && __FreeBSD_version >= 300001 struct callout_handle T200_callout; struct callout_handle T202_callout; struct callout_handle T203_callout; #endif int vr; /* receive sequence frame counter */ int vs; /* transmit sequence frame counter */ int va; /* acknowledge sequence frame counter */ int ack_pend; /* acknowledge pending */ int rej_excpt; /* reject exception */ int peer_busy; /* peer receiver busy */ int own_busy; /* own receiver busy */ int l3initiated; /* layer 3 initiated */ struct ifqueue i_queue; /* queue of outgoing i frames */ #define IQUEUE_MAXLEN 20 /* this implementation only supports a k-value of 1 !!! */ struct mbuf *ua_frame; /* last unacked frame */ int ua_num; /* last unacked frame number */ #define UA_EMPTY (-1) /* ua_frame is unused */ int rxd_CR; /* received Command Response bit */ int rxd_PF; /* received Poll/Final bit */ int rxd_NR; /* received N(R) field */ int RC; /* Retry Counter */ int iframe_sent; /* check if i frame acked by another i frame */ int (*postfsmfunc)(int);/* function to be called at fsm exit */ int postfsmarg; /* argument for above function */ } l2_softc_t; extern l2_softc_t l2_softc[]; /* Q.912 system parameters (Q.921 03/93 pp 43) */ #define MAX_K_VALUE 1 /* BRI - # of outstanding frames */ #define N200 3 /* max no of retransmissions */ #define N201DEF 260 /* max no of octetts in information field */ #define N202DEF 3 /* max no of TEI ID Request message transmissions */ #define T200DEF (hz*1) /* default T200 timer value = 1 second */ #define T201DEF T200DEF /* default T201 timer value = T200DEF */ #define T202DEF (hz*2) /* default T202 timer value = 2 seconds */ #define T203DEF (hz*10) /* default T203 timer value = 10 seconds*/ /* modulo 128 operations */ #define M128INC(v) (v)++; \ if((v)>127) \ { \ v = 0; \ } #define M128DEC(v) (v)--; \ if((v)<0) \ { \ v = 127;\ } /* P-bit values */ typedef enum { P0, P1 } pbit_t; /* F-bit values */ typedef enum { F0, F1 } fbit_t; /* CR-bit values to NT */ typedef enum { CR_CMD_TO_NT, CR_RSP_TO_NT } crbit_to_nt_t; /* CR-bit values from NT */ typedef enum { CR_RSP_FROM_NT, CR_CMD_FROM_NT } crbit_from_nt_t; /* address field - octett 2 */ #define OFF_SAPI 0 /* SAPI offset, HDLC flag is eaten by L1 */ #define SAPI_CCP 0 /* SAPI = 0 - call control procedures */ #define SAPI_X25 16 /* SAPI = 16 - X.25 packet procedures */ #define SAPI_L2M 63 /* SAPI = 63 - Layer 2 management procedures */ /* extract and insert macros for SAPI octett */ #define GETSAPI(octett) (((octett) >> 2) & 0x3f) #define PUTSAPI(sapi,cr,octett) ((octett) = (((sapi << 2) & 0xfc) | ((cr & 0x01) << 1))) #define GETCR(octett) (((octett) >> 1) & 0x01) #define GETEA(octett) ((octett) & 0x01) /* address field - octett 3 */ #define OFF_TEI 1 /* TEI offset */ #define GETTEI(octett) (((octett) >> 1) & 0x7f) #define PUTTEI(tei, octett) ((octett) = ((((tei) << 1) & 0xfe)) | 0x01) #define GROUP_TEI 127 /* broadcast TEI for LME */ /* control field - octett 4 */ #define OFF_CNTL 2 /* 1st byte of control field */ /* S frames */ #define S_FRAME_LEN 4 /* lenght of a U-frame */ #define OFF_SRCR 2 /* 1st byte of control field, */ /* R-commands and R-responses */ #define OFF_SNR 3 /* 2nd byte of control field, N(R) and PF */ #define SPFBIT 0x01 /* poll/final bit mask */ #define SPBITSET SPFBIT #define SFBITSET SPFBIT #define GETSNR(octett) (((octett) >> 1) & 0x7f) #define GETSPF(octett) ((octett) & SPFBIT) #define RR 0x01 /* RR and bit 0 set */ #define RNR 0x05 /* RNR and bit 0 set */ #define REJ 0x09 /* REJ and bit 0 set */ /* U frames */ #define UI_HDR_LEN 3 /* length of UI header in front of L3 frame */ #define U_FRAME_LEN 3 /* lenght of a U-frame */ #define UPFBIT 0x10 /* poll/final bit mask */ #define UPBITSET UPFBIT #define UFBITSET UPFBIT #define GETUPF(octett) (((octett) >> 4) & 0x01) /* commands/responses with pf bit set to 0 */ #define SABME 0x6f #define DM 0x0f #define UI 0x03 #define DISC 0x43 #define UA 0x63 #define FRMR 0x87 #define XID 0xaf /* control field - octett 3 */ #define OFF_MEI 3 /* 2nd byte of control field */ /* control field - octett 4,5 */ #define OFF_RIL 4 /* Ri low byte */ #define OFF_RIH 5 /* Ri high byte */ /* control field - octett 6 */ #define OFF_MT 6 /* Message Type */ #define OFF_AI 7 /* Action Indicator */ #define GET_TEIFROMAI(octett) (((octett) >> 1) & 0x7f) /* I frame */ #define I_HDR_LEN 4 /* length of I header in front of L3 frame */ #define OFF_INS 2 /* transmit sequence number */ #define OFF_INR 3 /* receive sequence number */ #define IPFBIT 0x01 /* poll/final bit mask */ #define IPBITSET 0x01 #define GETINR(octett) (((octett) >> 1) & 0x7f) #define GETINS(octett) (((octett) >> 1) & 0x7f) #define GETIP(octett) ((octett) & IPFBIT) /* structure of a TEI management frame */ #define TEI_MGMT_FRM_LEN 8 /* frame length */ #define TEIM_SAPIO 0x00 /* SAPI, CR, EA */ #define TEIM_TEIO 0x01 /* TEI, EA */ #define TEIM_UIO 0x02 /* frame type = UI = 0x03 */ #define TEIM_MEIO 0x03 /* management entity id = 0x0f */ #define MEI 0x0f #define TEIM_RILO 0x04 /* reference number, low */ #define TEIM_RIHO 0x05 /* reference number, high */ #define TEIM_MTO 0x06 /* message type */ #define MT_ID_REQEST 0x01 #define MT_ID_ASSIGN 0x02 #define MT_ID_DENY 0x03 #define MT_ID_CHK_REQ 0x04 #define MT_ID_CHK_RSP 0x05 #define MT_ID_REMOVE 0x06 #define MT_ID_VERIFY 0x07 #define TEIM_AIO 0x07 /* action indicator */ /* i4b_mdl_error_ind codes */ enum MDL_ERROR_CODES { MDL_ERR_A, MDL_ERR_B, MDL_ERR_C, MDL_ERR_D, MDL_ERR_E, MDL_ERR_F, MDL_ERR_G, MDL_ERR_H, MDL_ERR_I, MDL_ERR_J, MDL_ERR_K, MDL_ERR_L, MDL_ERR_M, MDL_ERR_N, MDL_ERR_O, MDL_ERR_MAX }; /* forward decl */ extern void i4b_acknowledge_pending ( l2_softc_t *l2sc ); extern struct mbuf * i4b_build_s_frame ( l2_softc_t *l2sc, crbit_to_nt_t crbit, pbit_t pbit, u_char type ); extern struct mbuf * i4b_build_u_frame ( l2_softc_t *l2sc, crbit_to_nt_t crbit, pbit_t pbit, u_char type ); extern void i4b_clear_exception_conditions ( l2_softc_t *l2sc ); extern int i4b_dl_data_req ( int unit, struct mbuf *m ); extern int i4b_dl_establish_req ( int unit ); extern int i4b_dl_release_req ( int unit ); extern int i4b_dl_unit_data_req ( int unit, struct mbuf *m ); extern void i4b_enquiry_response ( l2_softc_t *l2sc ); extern void i4b_establish_data_link ( l2_softc_t *l2sc ); extern void i4b_invoke_retransmission ( l2_softc_t *l2sc, int nr ); extern void i4b_i_frame_queued_up ( l2_softc_t *l2sc ); extern void i4b_l1_activate ( l2_softc_t *l2sc ); extern int i4b_l2_nr_ok ( int nr, int va, int vs ); extern void i4b_make_rand_ri ( l2_softc_t *l2sc ); extern void i4b_mdl_assign_ind ( l2_softc_t *l2sc ); extern void i4b_mdl_error_ind ( l2_softc_t *l2sc, char *where, int errorcode ); extern int i4b_mph_attach_ind ( int unit, int type ); extern int i4b_mph_status_ind ( int unit, int status, int parm ); extern void i4b_next_l2state ( l2_softc_t *l2sc, int event ); extern void i4b_nr_error_recovery ( l2_softc_t *l2sc ); extern int i4b_ph_activate_ind ( int unit ); extern int i4b_ph_deactivate_ind ( int unit ); extern int i4b_ph_data_ind ( int unit, struct mbuf *m ); extern void i4b_print_frame ( int len, u_char *buf ); extern char *i4b_print_l2state ( l2_softc_t *l2sc ); extern void i4b_print_l2var ( l2_softc_t *l2sc ); extern void i4b_rxd_ack(l2_softc_t *l2sc, int nr); extern void i4b_rxd_i_frame ( int unit, struct mbuf *m ); extern void i4b_rxd_s_frame ( int unit, struct mbuf *m ); extern void i4b_rxd_u_frame ( int unit, struct mbuf *m ); extern void i4b_T200_restart ( l2_softc_t *l2sc ); extern void i4b_T200_start ( l2_softc_t *l2sc ); extern void i4b_T200_stop ( l2_softc_t *l2sc ); extern void i4b_T202_start ( l2_softc_t *l2sc ); extern void i4b_T202_stop ( l2_softc_t *l2sc ); extern void i4b_T203_restart ( l2_softc_t *l2sc ); extern void i4b_T203_start ( l2_softc_t *l2sc ); extern void i4b_T203_stop ( l2_softc_t *l2sc ); extern void i4b_tei_assign ( l2_softc_t *l2sc ); extern void i4b_tei_chkresp ( l2_softc_t *l2sc ); extern void i4b_tei_rxframe ( int unit, struct mbuf *m ); extern void i4b_tei_verify ( l2_softc_t *l2sc ); extern void i4b_transmit_enquire ( l2_softc_t *l2sc ); extern void i4b_tx_disc ( l2_softc_t *l2sc, pbit_t pbit ); extern void i4b_tx_dm ( l2_softc_t *l2sc, fbit_t fbit ); extern void i4b_tx_frmr ( l2_softc_t *l2sc, fbit_t fbit ); extern void i4b_tx_rej_response ( l2_softc_t *l2sc, fbit_t fbit ); extern void i4b_tx_rnr_command ( l2_softc_t *l2sc, pbit_t pbit ); extern void i4b_tx_rnr_response ( l2_softc_t *l2sc, fbit_t fbit ); extern void i4b_tx_rr_command ( l2_softc_t *l2sc, pbit_t pbit ); extern void i4b_tx_rr_response ( l2_softc_t *l2sc, fbit_t fbit ); extern void i4b_tx_sabme ( l2_softc_t *l2sc, pbit_t pbit ); extern void i4b_tx_ua ( l2_softc_t *l2sc, fbit_t fbit ); #endif /* _I4B_L2_H_ */