3 #include <linux/lapb.h>
4 #include <linux/refcount.h>
6 #define LAPB_HEADER_LEN 20 /* LAPB over Ethernet + a bit more */
8 #define LAPB_ACK_PENDING_CONDITION 0x01
9 #define LAPB_REJECT_CONDITION 0x02
10 #define LAPB_PEER_RX_BUSY_CONDITION 0x04
12 /* Control field templates */
13 #define LAPB_I 0x00 /* Information frames */
14 #define LAPB_S 0x01 /* Supervisory frames */
15 #define LAPB_U 0x03 /* Unnumbered frames */
17 #define LAPB_RR 0x01 /* Receiver ready */
18 #define LAPB_RNR 0x05 /* Receiver not ready */
19 #define LAPB_REJ 0x09 /* Reject */
21 #define LAPB_SABM 0x2F /* Set Asynchronous Balanced Mode */
22 #define LAPB_SABME 0x6F /* Set Asynchronous Balanced Mode Extended */
23 #define LAPB_DISC 0x43 /* Disconnect */
24 #define LAPB_DM 0x0F /* Disconnected mode */
25 #define LAPB_UA 0x63 /* Unnumbered acknowledge */
26 #define LAPB_FRMR 0x87 /* Frame reject */
28 #define LAPB_ILLEGAL 0x100 /* Impossible to be a real frame type */
30 #define LAPB_SPF 0x10 /* Poll/final bit for standard LAPB */
31 #define LAPB_EPF 0x01 /* Poll/final bit for extended LAPB */
33 #define LAPB_FRMR_W 0x01 /* Control field invalid */
34 #define LAPB_FRMR_X 0x02 /* I field invalid */
35 #define LAPB_FRMR_Y 0x04 /* I field too long */
36 #define LAPB_FRMR_Z 0x08 /* Invalid N(R) */
38 #define LAPB_POLLOFF 0
42 #define LAPB_COMMAND 1
43 #define LAPB_RESPONSE 2
45 #define LAPB_ADDR_A 0x03
46 #define LAPB_ADDR_B 0x01
47 #define LAPB_ADDR_C 0x0F
48 #define LAPB_ADDR_D 0x07
50 /* Define Link State constants. */
52 LAPB_STATE_0, /* Disconnected State */
53 LAPB_STATE_1, /* Awaiting Connection State */
54 LAPB_STATE_2, /* Awaiting Disconnection State */
55 LAPB_STATE_3, /* Data Transfer State */
56 LAPB_STATE_4 /* Frame Reject State */
59 #define LAPB_DEFAULT_MODE (LAPB_STANDARD | LAPB_SLP | LAPB_DTE)
60 #define LAPB_DEFAULT_WINDOW 7 /* Window=7 */
61 #define LAPB_DEFAULT_T1 (5 * HZ) /* T1=5s */
62 #define LAPB_DEFAULT_T2 (1 * HZ) /* T2=1s */
63 #define LAPB_DEFAULT_N2 20 /* N2=20 */
65 #define LAPB_SMODULUS 8
66 #define LAPB_EMODULUS 128
69 * Information about the current frame.
72 unsigned short type; /* Parsed type */
73 unsigned short nr, ns; /* N(R), N(S) */
74 unsigned char cr; /* Command/Response */
75 unsigned char pf; /* Poll/Final */
76 unsigned char control[2]; /* Original control data*/
80 * The per LAPB connection control structure.
83 struct list_head node;
84 struct net_device *dev;
86 /* Link status fields */
89 unsigned short vs, vr, va;
90 unsigned char condition;
91 unsigned short n2, n2count;
92 unsigned short t1, t2;
93 struct timer_list t1timer, t2timer;
95 /* Internal control information */
96 struct sk_buff_head write_queue;
97 struct sk_buff_head ack_queue;
99 const struct lapb_register_struct *callbacks;
101 /* FRMR control information */
102 struct lapb_frame frmr_data;
103 unsigned char frmr_type;
109 void lapb_connect_confirmation(struct lapb_cb *lapb, int);
110 void lapb_connect_indication(struct lapb_cb *lapb, int);
111 void lapb_disconnect_confirmation(struct lapb_cb *lapb, int);
112 void lapb_disconnect_indication(struct lapb_cb *lapb, int);
113 int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *);
114 int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *);
117 void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *);
120 void lapb_kick(struct lapb_cb *lapb);
121 void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int);
122 void lapb_establish_data_link(struct lapb_cb *lapb);
123 void lapb_enquiry_response(struct lapb_cb *lapb);
124 void lapb_timeout_response(struct lapb_cb *lapb);
125 void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short);
126 void lapb_check_need_response(struct lapb_cb *lapb, int, int);
129 void lapb_clear_queues(struct lapb_cb *lapb);
130 void lapb_frames_acked(struct lapb_cb *lapb, unsigned short);
131 void lapb_requeue_frames(struct lapb_cb *lapb);
132 int lapb_validate_nr(struct lapb_cb *lapb, unsigned short);
133 int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *);
134 void lapb_send_control(struct lapb_cb *lapb, int, int, int);
135 void lapb_transmit_frmr(struct lapb_cb *lapb);
138 void lapb_start_t1timer(struct lapb_cb *lapb);
139 void lapb_start_t2timer(struct lapb_cb *lapb);
140 void lapb_stop_t1timer(struct lapb_cb *lapb);
141 void lapb_stop_t2timer(struct lapb_cb *lapb);
142 int lapb_t1timer_running(struct lapb_cb *lapb);
148 * 2 = Packets I/O and State Changes
149 * 3 = Hex dumps, Packets I/O and State Changes.
153 #define lapb_dbg(level, fmt, ...) \
155 if (level < LAPB_DEBUG) \
156 pr_debug(fmt, ##__VA_ARGS__); \