pdp11v/usr/include/sys/x25packet.h
/* x25packet.h 1.3 of 12/18/81
@(#)x25packet.h 1.3
*/
/* this file contains the layout of the BLX.25 level 3 packet header */
/* layout of the level 3 packet header common for all level 3
* packet types - this is contained in the buffer descriptor
* structure vpmbd
*/
struct level_3 {
char x25_oct1; /* octet 1 of the header */
char x25_oct2; /* octet 2 of the header */
char x25_oct3; /* octet 3 of the header */
};
/* layout for x25_octet 1 of the level 3 header
*
* ABCCDDDD
*
* A - qualifier bit
* B - delivery conformation bit
* C - general format identifier
* D - logical channel group number
*/
/* mask of x25_octet 1 items */
#define X25_QBIT 0x80
#define X25_DBIT 0x40
#define X25_GFI 0x30
#define X25_LCGN 0x0f
/* address of x25_octet 1 items */
#define A_QBIT x25_oct1
#define A_DBIT x25_oct1
#define A_GFI x25_oct1
#define A_LCGN x25_oct1
/* displacement of x25_octet 1 items */
#define H_QBIT 7
#define H_DBIT 6
#define H_GFI 4
#define H_LCGN 0
/* layout for x25_octet 2 of the level 3 header
*
* AAAAAAAA
*
* A - logical channel number
*/
/* mask of x25_octet 2 items */
#define X25_LCN 0xff
/* address of x25_octet 2 items */
#define A_LCN x25_oct2
/* displacement of x25_octet 2 items */
#define H_LCN 0
/* layout for x25_octet 3 of the level 3 header
*
* the layout of the third word of the header is
* dependent on the packet type
*/
/* layout of x25_octet 3 for an information packet
* packet types -
* data
*
* AAABCCCD
*
* A - packet receive sequence number
* B - more data indicator (M bit)
* C - packet send sequence number
* D - data packet indicator (if 0)
*/
/* mask of x25_octet 3 items */
#define X25_PR 0xe0
#define X25_MBIT 0x10
#define X25_PS 0x0e
#define X25_DFLG 0x01
/* address of x25_octet 3 items */
#define A_PR x25_oct3
#define A_MBIT x25_oct3
#define A_PS x25_oct3
#define A_DFLG x25_oct3
/* displacement of x25_octet 3 items */
#define H_PR 5
#define H_MBIT 4
#define H_PS 1
#define H_DFLG 0
/* layout of x25_octet 3 for a supervisory packet
* packet types -
* RR (receiver ready)
* RNR (receiver not ready)
* REJ (data reject)
*
* AAABBBBB
*
* A - packet receive sequence number
* B - supervisory packet type
*/
/* mask of x25_octet 3 items */
#define X25_STYPE 0x1f
/* address of x25_octet 3 items */
#define A_STYPE x25_oct3
/* displacement of x25_octet 3 items */
#define H_STYPE 0
/* layout of x25_octet 3 for an unnumbered packet
* packet types -
* RST (link group restart)
* RSTC (link group restart confirm)
* RES (channel reset)
* RESC (channel reset confirm)
* INT (interrupt)
* INTC (interrupt confirm)
*
* AAAAAAAA
*
* A - unnumbered packet type
*/
/* mask of x25_octet 3 items */
#define X25_UTYPE 0xff
/* address of x25_octet 3 items */
#define A_UTYPE x25_oct3
/* displacement of x25_octet 3 items */
#define H_UTYPE 0
/* states for information packet type
*/
#define T_DATA 0
/* states for supervisory packet type
*/
#define T_RR 0x1
#define T_RNR 0x5
#define T_REJ 0x9
/* states for unnumbered packet type
*/
#define T_RST 0xfb
#define T_RSTC 0xff
#define T_RES 0x1b
#define T_RESC 0x1f
#define T_INT 0x23
#define T_INTC 0x27
/* values for valid packet lengths */
#define X25DATAL 3
#define X25RRL 3
#define X25RNRL 3
#define X25REJL 3
#define X25RSTL 4
#define X25RSTCL 3
#define X25RESL 4
#define X25RESCL 3
#define X25INTL 4
#define X25INTCL 3
/* values for items in the level 3 packet header */
/* states for general format indicator */
#define X25DTEGFI 0x1
/* states for cause field */
#define X25CAUSE 0
/* states for diagnostic codes */
#define X25NODGNC 0
#define X25INVPS 1
#define X25INVPR 2
/* the following are for packet types invalid for a given state */
#define X25INVTYP 16
#define X25INVR1 17
#define X25INVR2 18
#define X25INVD1 27
#define X25INVD2 28
#define X25INVD3 29
#define X25BADSTATE 30
/* the following are for packets that are not allowed */
#define X25NAPKT 32
#define X25UIDPKT 33
#define X25INVPVC 35
#define X25SHORTP 38
#define X25LONGP 39
#define X25INVGFI 40
#define X25INVRST 41
#define X25UAINC 43
#define X25UAINT 44
#define X25XREJ 45
#define X25INVMBIT 47
/* the following are for expired timers */
#define X25TORES 51
#define X25TORST 52
/* the following are for additional DTE codes not covered above */
#define X25OUTORD 129
#define X25INSERV 130
#define X25INSPVC 131
#define X25TOINTC 145
#define X25TODATA 146
#define X25TOREJ 147