1 /* if_ether.h needed for definition of ETH_DATA_LEN and ETH_ALEN
2 */
3 #include "linux/if_ether.h"
4
5 /* frame layout based on par3.2 "LLC PDU format"
6 */
7 typedef union { /* pdu layout from pages 40 & 44 */
8 struct { /* general header, all pdu types */
9 unsigned dsap : 8; /* dest service access point */
10 unsigned ssap : 8; /* source service access point */
11 unsigned f1 : 1; /* I- U- or S- format id bits */
12 unsigned f2 : 1;
13 unsigned : 6;
14 unsigned : 8;
15 } pdu_hdr;
16 struct {
17 char dummy1[2]; /* dsap + ssap */
18 char byte1;
19 char byte2;
20 } pdu_cntl; /* unformatted control bytes */
21 struct { /* header of an Information pdu */
22 unsigned char dummy2[2];
23 unsigned : 1;
24 unsigned ns : 7;
25 unsigned i_pflag : 1; /* poll/final bit */
26 unsigned nr : 7; /* N(R) */
27 unsigned char is_info[ ETH_DATA_LEN ];
28 } i_hdr;
29 struct { /* header of a Supervisory pdu */
30 unsigned char dummy3[2];
31 unsigned : 2;
32 unsigned ss : 2; /* supervisory function bits */
33 unsigned : 4;
34 unsigned s_pflag : 1; /* poll/final bit */
35 unsigned nr : 7; /* N(R) */
36 } s_hdr;
37
38 /* when accessing the P/F bit or the N(R) field there's no need to distinguish
39 I pdus from S pdus i_pflag and s_pflag / i_nr and s_nr map to the same
40 physical location.
41 */
42 struct { /* header of an Unnumbered pdu */
43 unsigned char dummy4[2];
44 unsigned : 2;
45 unsigned mm1 : 2; /* modifier function part1 */
46 unsigned u_pflag : 1; /* P/F for U- pdus */
47 unsigned mm2 : 3; /* modifier function part2 */
48 unsigned char u_info[ ETH_DATA_LEN-1];
49 } u_hdr;
50 struct { /* mm field in an Unnumbered pdu */
51 unsigned char dummy5[2];
52 unsigned : 2;
53 unsigned mm : 6; /* must be masked to get ridd of P/F ! */
54 } u_mm;
55
56 } frame_type, *frameptr;
57
58 /* frame format test macros: */
59
60 #define IS_UFRAME( fr ) ( ( (fr)->pdu_hdr.f1) & ( (fr)->pdu_hdr.f2) )
61
62 #define IS_IFRAME( fr ) ( !( (fr)->pdu_hdr.f1) )
63
64 #define IS_SFRAME( fr ) ( ( (fr)->pdu_hdr.f1) & !( (fr)->pdu_hdr.f2) )
65
66 #define IS_RSP( fr ) ( fr->pdu_hdr.ssap & 0x01 )
67
68
69 /* The transition table, the _encode tables and some tests in the
70 source code depend on the numeric order of these values.
71 Think twice before changing.
72 */
73
74 /* frame names for TYPE 2 operation: */
75 #define I_CMD 0
76 #define RR_CMD 1
77 #define RNR_CMD 2
78 #define REJ_CMD 3
79 #define DISC_CMD 4
80 #define SABME_CMD 5
81 #define I_RSP 6
82 #define RR_RSP 7
83 #define RNR_RSP 8
84 #define REJ_RSP 9
85 #define UA_RSP 10
86 #define DM_RSP 11
87 #define FRMR_RSP 12
88
89 /* junk frame name: */
90 #define BAD_FRAME 13
91 #define NO_FRAME 13
92
93 /* frame names for TYPE 1 operation: */
94 #define UI_CMD 14
95 #define XID_CMD 15
96 #define TEST_CMD 16
97 #define XID_RSP 17
98 #define TEST_RSP 18
99
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