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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - include/net/lapb.h
1 /* SPDX-License-Identifier: GPL-2.0 */
4 #include <linux/lapb.h>
5 #include <linux/refcount.h>
7 #define LAPB_HEADER_LEN 20 /* LAPB over Ethernet + a bit more */
9 #define LAPB_ACK_PENDING_CONDITION 0x01
10 #define LAPB_REJECT_CONDITION 0x02
11 #define LAPB_PEER_RX_BUSY_CONDITION 0x04
13 /* Control field templates */
14 #define LAPB_I 0x00 /* Information frames */
15 #define LAPB_S 0x01 /* Supervisory frames */
16 #define LAPB_U 0x03 /* Unnumbered frames */
18 #define LAPB_RR 0x01 /* Receiver ready */
19 #define LAPB_RNR 0x05 /* Receiver not ready */
20 #define LAPB_REJ 0x09 /* Reject */
22 #define LAPB_SABM 0x2F /* Set Asynchronous Balanced Mode */
23 #define LAPB_SABME 0x6F /* Set Asynchronous Balanced Mode Extended */
24 #define LAPB_DISC 0x43 /* Disconnect */
25 #define LAPB_DM 0x0F /* Disconnected mode */
26 #define LAPB_UA 0x63 /* Unnumbered acknowledge */
27 #define LAPB_FRMR 0x87 /* Frame reject */
29 #define LAPB_ILLEGAL 0x100 /* Impossible to be a real frame type */
31 #define LAPB_SPF 0x10 /* Poll/final bit for standard LAPB */
32 #define LAPB_EPF 0x01 /* Poll/final bit for extended LAPB */
34 #define LAPB_FRMR_W 0x01 /* Control field invalid */
35 #define LAPB_FRMR_X 0x02 /* I field invalid */
36 #define LAPB_FRMR_Y 0x04 /* I field too long */
37 #define LAPB_FRMR_Z 0x08 /* Invalid N(R) */
39 #define LAPB_POLLOFF 0
43 #define LAPB_COMMAND 1
44 #define LAPB_RESPONSE 2
46 #define LAPB_ADDR_A 0x03
47 #define LAPB_ADDR_B 0x01
48 #define LAPB_ADDR_C 0x0F
49 #define LAPB_ADDR_D 0x07
51 /* Define Link State constants. */
53 LAPB_STATE_0
, /* Disconnected State */
54 LAPB_STATE_1
, /* Awaiting Connection State */
55 LAPB_STATE_2
, /* Awaiting Disconnection State */
56 LAPB_STATE_3
, /* Data Transfer State */
57 LAPB_STATE_4
/* Frame Reject State */
60 #define LAPB_DEFAULT_MODE (LAPB_STANDARD | LAPB_SLP | LAPB_DTE)
61 #define LAPB_DEFAULT_WINDOW 7 /* Window=7 */
62 #define LAPB_DEFAULT_T1 (5 * HZ) /* T1=5s */
63 #define LAPB_DEFAULT_T2 (1 * HZ) /* T2=1s */
64 #define LAPB_DEFAULT_N2 20 /* N2=20 */
66 #define LAPB_SMODULUS 8
67 #define LAPB_EMODULUS 128
70 * Information about the current frame.
73 unsigned short type
; /* Parsed type */
74 unsigned short nr
, ns
; /* N(R), N(S) */
75 unsigned char cr
; /* Command/Response */
76 unsigned char pf
; /* Poll/Final */
77 unsigned char control
[2]; /* Original control data*/
81 * The per LAPB connection control structure.
84 struct list_head node
;
85 struct net_device
*dev
;
87 /* Link status fields */
90 unsigned short vs
, vr
, va
;
91 unsigned char condition
;
92 unsigned short n2
, n2count
;
93 unsigned short t1
, t2
;
94 struct timer_list t1timer
, t2timer
;
96 /* Internal control information */
97 struct sk_buff_head write_queue
;
98 struct sk_buff_head ack_queue
;
100 const struct lapb_register_struct
*callbacks
;
102 /* FRMR control information */
103 struct lapb_frame frmr_data
;
104 unsigned char frmr_type
;
110 void lapb_connect_confirmation(struct lapb_cb
*lapb
, int);
111 void lapb_connect_indication(struct lapb_cb
*lapb
, int);
112 void lapb_disconnect_confirmation(struct lapb_cb
*lapb
, int);
113 void lapb_disconnect_indication(struct lapb_cb
*lapb
, int);
114 int lapb_data_indication(struct lapb_cb
*lapb
, struct sk_buff
*);
115 int lapb_data_transmit(struct lapb_cb
*lapb
, struct sk_buff
*);
118 void lapb_data_input(struct lapb_cb
*lapb
, struct sk_buff
*);
121 void lapb_kick(struct lapb_cb
*lapb
);
122 void lapb_transmit_buffer(struct lapb_cb
*lapb
, struct sk_buff
*, int);
123 void lapb_establish_data_link(struct lapb_cb
*lapb
);
124 void lapb_enquiry_response(struct lapb_cb
*lapb
);
125 void lapb_timeout_response(struct lapb_cb
*lapb
);
126 void lapb_check_iframes_acked(struct lapb_cb
*lapb
, unsigned short);
127 void lapb_check_need_response(struct lapb_cb
*lapb
, int, int);
130 void lapb_clear_queues(struct lapb_cb
*lapb
);
131 void lapb_frames_acked(struct lapb_cb
*lapb
, unsigned short);
132 void lapb_requeue_frames(struct lapb_cb
*lapb
);
133 int lapb_validate_nr(struct lapb_cb
*lapb
, unsigned short);
134 int lapb_decode(struct lapb_cb
*lapb
, struct sk_buff
*, struct lapb_frame
*);
135 void lapb_send_control(struct lapb_cb
*lapb
, int, int, int);
136 void lapb_transmit_frmr(struct lapb_cb
*lapb
);
139 void lapb_start_t1timer(struct lapb_cb
*lapb
);
140 void lapb_start_t2timer(struct lapb_cb
*lapb
);
141 void lapb_stop_t1timer(struct lapb_cb
*lapb
);
142 void lapb_stop_t2timer(struct lapb_cb
*lapb
);
143 int lapb_t1timer_running(struct lapb_cb
*lapb
);
149 * 2 = Packets I/O and State Changes
150 * 3 = Hex dumps, Packets I/O and State Changes.
154 #define lapb_dbg(level, fmt, ...) \
156 if (level < LAPB_DEBUG) \
157 pr_debug(fmt, ##__VA_ARGS__); \