Subversion Repositories or1k

/* if_ether.h needed for definition of ETH_DATA_LEN and ETH_ALEN

 */

#include "linux/if_ether.h"

/* frame layout based on par3.2 "LLC PDU format"

 */

typedef union {                 /* pdu layout from pages 40 & 44 */

    struct {                    /* general header, all pdu types */

        unsigned dsap : 8;      /* dest service access point */

        unsigned ssap : 8;      /* source service access point */

        unsigned f1 : 1;        /* I- U- or S- format id bits */

        unsigned f2 : 1;

        unsigned : 6;

        unsigned : 8;

   } pdu_hdr;

   struct {

        char dummy1[2];         /* dsap + ssap */

        char byte1;

        char byte2;

   } pdu_cntl;                  /* unformatted control bytes */

   struct {                     /* header of an Information pdu */

        unsigned char dummy2[2];

        unsigned : 1;

        unsigned ns : 7;

        unsigned i_pflag : 1;   /* poll/final bit */

        unsigned nr : 7;        /* N(R)  */

        unsigned char is_info[ ETH_DATA_LEN ];

   }  i_hdr;

   struct {                     /* header of a Supervisory pdu */

        unsigned char dummy3[2];

        unsigned : 2;

        unsigned ss : 2;        /* supervisory function bits */

        unsigned : 4;

        unsigned s_pflag : 1;   /* poll/final bit  */

        unsigned nr : 7;        /* N(R)  */

   } s_hdr;

/* when accessing the P/F bit or the N(R) field there's no need to distinguish

   I pdus from S pdus i_pflag and s_pflag / i_nr and s_nr map to the same

   physical location.

 */

   struct {                     /* header of an Unnumbered pdu */

        unsigned char dummy4[2];

        unsigned : 2;

        unsigned mm1 : 2;       /* modifier function part1 */

        unsigned u_pflag : 1;    /* P/F for U- pdus */

        unsigned mm2 : 3;       /* modifier function part2 */

        unsigned char u_info[ ETH_DATA_LEN-1];

   } u_hdr;

   struct {                     /* mm field in an Unnumbered pdu */

        unsigned char dummy5[2];

        unsigned : 2;

        unsigned mm : 6;        /* must be masked to get ridd of P/F !  */

   } u_mm;

} frame_type, *frameptr;

/* frame format test macros: */

#define IS_UFRAME( fr ) ( ( (fr)->pdu_hdr.f1) & ( (fr)->pdu_hdr.f2) )

#define IS_IFRAME( fr ) ( !( (fr)->pdu_hdr.f1) )

#define IS_SFRAME( fr ) ( ( (fr)->pdu_hdr.f1) & !( (fr)->pdu_hdr.f2) )

#define IS_RSP( fr ) ( fr->pdu_hdr.ssap & 0x01 )

/* The transition table, the _encode tables and some tests in the

   source code depend on the numeric order of these values.

   Think twice before changing.

 */

/* frame names for TYPE 2 operation: */

#define I_CMD           0

#define RR_CMD          1

#define RNR_CMD         2

#define REJ_CMD         3

#define DISC_CMD        4

#define SABME_CMD       5

#define I_RSP           6

#define RR_RSP          7

#define RNR_RSP         8

#define REJ_RSP         9

#define UA_RSP          10

#define DM_RSP          11

#define FRMR_RSP        12

/* junk frame name: */

#define BAD_FRAME       13

#define NO_FRAME        13

/* frame names for TYPE 1 operation: */

#define UI_CMD          14

#define XID_CMD         15

#define TEST_CMD        16

#define XID_RSP         17

#define TEST_RSP        18