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162 lines
4.8 KiB
162 lines
4.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LAPB_H |
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#define _LAPB_H |
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#include <linux/lapb.h> |
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#include <linux/refcount.h> |
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#define LAPB_HEADER_LEN 20 /* LAPB over Ethernet + a bit more */ |
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#define LAPB_ACK_PENDING_CONDITION 0x01 |
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#define LAPB_REJECT_CONDITION 0x02 |
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#define LAPB_PEER_RX_BUSY_CONDITION 0x04 |
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/* Control field templates */ |
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#define LAPB_I 0x00 /* Information frames */ |
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#define LAPB_S 0x01 /* Supervisory frames */ |
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#define LAPB_U 0x03 /* Unnumbered frames */ |
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#define LAPB_RR 0x01 /* Receiver ready */ |
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#define LAPB_RNR 0x05 /* Receiver not ready */ |
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#define LAPB_REJ 0x09 /* Reject */ |
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#define LAPB_SABM 0x2F /* Set Asynchronous Balanced Mode */ |
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#define LAPB_SABME 0x6F /* Set Asynchronous Balanced Mode Extended */ |
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#define LAPB_DISC 0x43 /* Disconnect */ |
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#define LAPB_DM 0x0F /* Disconnected mode */ |
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#define LAPB_UA 0x63 /* Unnumbered acknowledge */ |
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#define LAPB_FRMR 0x87 /* Frame reject */ |
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#define LAPB_ILLEGAL 0x100 /* Impossible to be a real frame type */ |
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#define LAPB_SPF 0x10 /* Poll/final bit for standard LAPB */ |
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#define LAPB_EPF 0x01 /* Poll/final bit for extended LAPB */ |
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#define LAPB_FRMR_W 0x01 /* Control field invalid */ |
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#define LAPB_FRMR_X 0x02 /* I field invalid */ |
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#define LAPB_FRMR_Y 0x04 /* I field too long */ |
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#define LAPB_FRMR_Z 0x08 /* Invalid N(R) */ |
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#define LAPB_POLLOFF 0 |
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#define LAPB_POLLON 1 |
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/* LAPB C-bit */ |
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#define LAPB_COMMAND 1 |
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#define LAPB_RESPONSE 2 |
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#define LAPB_ADDR_A 0x03 |
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#define LAPB_ADDR_B 0x01 |
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#define LAPB_ADDR_C 0x0F |
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#define LAPB_ADDR_D 0x07 |
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/* Define Link State constants. */ |
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enum { |
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LAPB_STATE_0, /* Disconnected State */ |
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LAPB_STATE_1, /* Awaiting Connection State */ |
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LAPB_STATE_2, /* Awaiting Disconnection State */ |
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LAPB_STATE_3, /* Data Transfer State */ |
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LAPB_STATE_4 /* Frame Reject State */ |
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}; |
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#define LAPB_DEFAULT_MODE (LAPB_STANDARD | LAPB_SLP | LAPB_DTE) |
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#define LAPB_DEFAULT_WINDOW 7 /* Window=7 */ |
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#define LAPB_DEFAULT_T1 (5 * HZ) /* T1=5s */ |
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#define LAPB_DEFAULT_T2 (1 * HZ) /* T2=1s */ |
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#define LAPB_DEFAULT_N2 20 /* N2=20 */ |
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#define LAPB_SMODULUS 8 |
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#define LAPB_EMODULUS 128 |
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/* |
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* Information about the current frame. |
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*/ |
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struct lapb_frame { |
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unsigned short type; /* Parsed type */ |
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unsigned short nr, ns; /* N(R), N(S) */ |
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unsigned char cr; /* Command/Response */ |
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unsigned char pf; /* Poll/Final */ |
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unsigned char control[2]; /* Original control data*/ |
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}; |
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/* |
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* The per LAPB connection control structure. |
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*/ |
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struct lapb_cb { |
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struct list_head node; |
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struct net_device *dev; |
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/* Link status fields */ |
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unsigned int mode; |
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unsigned char state; |
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unsigned short vs, vr, va; |
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unsigned char condition; |
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unsigned short n2, n2count; |
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unsigned short t1, t2; |
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struct timer_list t1timer, t2timer; |
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bool t1timer_stop, t2timer_stop; |
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/* Internal control information */ |
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struct sk_buff_head write_queue; |
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struct sk_buff_head ack_queue; |
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unsigned char window; |
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const struct lapb_register_struct *callbacks; |
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/* FRMR control information */ |
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struct lapb_frame frmr_data; |
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unsigned char frmr_type; |
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spinlock_t lock; |
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refcount_t refcnt; |
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}; |
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/* lapb_iface.c */ |
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void lapb_connect_confirmation(struct lapb_cb *lapb, int); |
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void lapb_connect_indication(struct lapb_cb *lapb, int); |
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void lapb_disconnect_confirmation(struct lapb_cb *lapb, int); |
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void lapb_disconnect_indication(struct lapb_cb *lapb, int); |
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int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *); |
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int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *); |
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/* lapb_in.c */ |
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void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *); |
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/* lapb_out.c */ |
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void lapb_kick(struct lapb_cb *lapb); |
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void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int); |
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void lapb_establish_data_link(struct lapb_cb *lapb); |
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void lapb_enquiry_response(struct lapb_cb *lapb); |
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void lapb_timeout_response(struct lapb_cb *lapb); |
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void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short); |
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void lapb_check_need_response(struct lapb_cb *lapb, int, int); |
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/* lapb_subr.c */ |
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void lapb_clear_queues(struct lapb_cb *lapb); |
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void lapb_frames_acked(struct lapb_cb *lapb, unsigned short); |
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void lapb_requeue_frames(struct lapb_cb *lapb); |
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int lapb_validate_nr(struct lapb_cb *lapb, unsigned short); |
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int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *); |
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void lapb_send_control(struct lapb_cb *lapb, int, int, int); |
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void lapb_transmit_frmr(struct lapb_cb *lapb); |
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/* lapb_timer.c */ |
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void lapb_start_t1timer(struct lapb_cb *lapb); |
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void lapb_start_t2timer(struct lapb_cb *lapb); |
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void lapb_stop_t1timer(struct lapb_cb *lapb); |
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void lapb_stop_t2timer(struct lapb_cb *lapb); |
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int lapb_t1timer_running(struct lapb_cb *lapb); |
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/* |
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* Debug levels. |
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* 0 = Off |
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* 1 = State Changes |
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* 2 = Packets I/O and State Changes |
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* 3 = Hex dumps, Packets I/O and State Changes. |
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*/ |
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#define LAPB_DEBUG 0 |
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#define lapb_dbg(level, fmt, ...) \ |
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do { \ |
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if (level < LAPB_DEBUG) \ |
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pr_debug(fmt, ##__VA_ARGS__); \ |
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} while (0) |
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#endif
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