patch-2.1.15 linux/include/net/llc_frame.h

• Lines: 99
• Date: Thu Dec 12 16:54:21 1996
• Orig file: v2.1.14/linux/include/net/llc_frame.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.14/linux/include/net/llc_frame.h linux/include/net/llc_frame.h
@@ -0,0 +1,98 @@
+/* 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