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-rw-r--r--include/net/lapb.h162
1 files changed, 162 insertions, 0 deletions
diff --git a/include/net/lapb.h b/include/net/lapb.h
new file mode 100644
index 000000000..124ee122f
--- /dev/null
+++ b/include/net/lapb.h
@@ -0,0 +1,162 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LAPB_H
+#define _LAPB_H
+#include <linux/lapb.h>
+#include <linux/refcount.h>
+
+#define LAPB_HEADER_LEN 20 /* LAPB over Ethernet + a bit more */
+
+#define LAPB_ACK_PENDING_CONDITION 0x01
+#define LAPB_REJECT_CONDITION 0x02
+#define LAPB_PEER_RX_BUSY_CONDITION 0x04
+
+/* Control field templates */
+#define LAPB_I 0x00 /* Information frames */
+#define LAPB_S 0x01 /* Supervisory frames */
+#define LAPB_U 0x03 /* Unnumbered frames */
+
+#define LAPB_RR 0x01 /* Receiver ready */
+#define LAPB_RNR 0x05 /* Receiver not ready */
+#define LAPB_REJ 0x09 /* Reject */
+
+#define LAPB_SABM 0x2F /* Set Asynchronous Balanced Mode */
+#define LAPB_SABME 0x6F /* Set Asynchronous Balanced Mode Extended */
+#define LAPB_DISC 0x43 /* Disconnect */
+#define LAPB_DM 0x0F /* Disconnected mode */
+#define LAPB_UA 0x63 /* Unnumbered acknowledge */
+#define LAPB_FRMR 0x87 /* Frame reject */
+
+#define LAPB_ILLEGAL 0x100 /* Impossible to be a real frame type */
+
+#define LAPB_SPF 0x10 /* Poll/final bit for standard LAPB */
+#define LAPB_EPF 0x01 /* Poll/final bit for extended LAPB */
+
+#define LAPB_FRMR_W 0x01 /* Control field invalid */
+#define LAPB_FRMR_X 0x02 /* I field invalid */
+#define LAPB_FRMR_Y 0x04 /* I field too long */
+#define LAPB_FRMR_Z 0x08 /* Invalid N(R) */
+
+#define LAPB_POLLOFF 0
+#define LAPB_POLLON 1
+
+/* LAPB C-bit */
+#define LAPB_COMMAND 1
+#define LAPB_RESPONSE 2
+
+#define LAPB_ADDR_A 0x03
+#define LAPB_ADDR_B 0x01
+#define LAPB_ADDR_C 0x0F
+#define LAPB_ADDR_D 0x07
+
+/* Define Link State constants. */
+enum {
+ LAPB_STATE_0, /* Disconnected State */
+ LAPB_STATE_1, /* Awaiting Connection State */
+ LAPB_STATE_2, /* Awaiting Disconnection State */
+ LAPB_STATE_3, /* Data Transfer State */
+ LAPB_STATE_4 /* Frame Reject State */
+};
+
+#define LAPB_DEFAULT_MODE (LAPB_STANDARD | LAPB_SLP | LAPB_DTE)
+#define LAPB_DEFAULT_WINDOW 7 /* Window=7 */
+#define LAPB_DEFAULT_T1 (5 * HZ) /* T1=5s */
+#define LAPB_DEFAULT_T2 (1 * HZ) /* T2=1s */
+#define LAPB_DEFAULT_N2 20 /* N2=20 */
+
+#define LAPB_SMODULUS 8
+#define LAPB_EMODULUS 128
+
+/*
+ * Information about the current frame.
+ */
+struct lapb_frame {
+ unsigned short type; /* Parsed type */
+ unsigned short nr, ns; /* N(R), N(S) */
+ unsigned char cr; /* Command/Response */
+ unsigned char pf; /* Poll/Final */
+ unsigned char control[2]; /* Original control data*/
+};
+
+/*
+ * The per LAPB connection control structure.
+ */
+struct lapb_cb {
+ struct list_head node;
+ struct net_device *dev;
+
+ /* Link status fields */
+ unsigned int mode;
+ unsigned char state;
+ unsigned short vs, vr, va;
+ unsigned char condition;
+ unsigned short n2, n2count;
+ unsigned short t1, t2;
+ struct timer_list t1timer, t2timer;
+ bool t1timer_running, t2timer_running;
+
+ /* Internal control information */
+ struct sk_buff_head write_queue;
+ struct sk_buff_head ack_queue;
+ unsigned char window;
+ const struct lapb_register_struct *callbacks;
+
+ /* FRMR control information */
+ struct lapb_frame frmr_data;
+ unsigned char frmr_type;
+
+ spinlock_t lock;
+ refcount_t refcnt;
+};
+
+/* lapb_iface.c */
+void lapb_connect_confirmation(struct lapb_cb *lapb, int);
+void lapb_connect_indication(struct lapb_cb *lapb, int);
+void lapb_disconnect_confirmation(struct lapb_cb *lapb, int);
+void lapb_disconnect_indication(struct lapb_cb *lapb, int);
+int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *);
+int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *);
+
+/* lapb_in.c */
+void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *);
+
+/* lapb_out.c */
+void lapb_kick(struct lapb_cb *lapb);
+void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int);
+void lapb_establish_data_link(struct lapb_cb *lapb);
+void lapb_enquiry_response(struct lapb_cb *lapb);
+void lapb_timeout_response(struct lapb_cb *lapb);
+void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short);
+void lapb_check_need_response(struct lapb_cb *lapb, int, int);
+
+/* lapb_subr.c */
+void lapb_clear_queues(struct lapb_cb *lapb);
+void lapb_frames_acked(struct lapb_cb *lapb, unsigned short);
+void lapb_requeue_frames(struct lapb_cb *lapb);
+int lapb_validate_nr(struct lapb_cb *lapb, unsigned short);
+int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *);
+void lapb_send_control(struct lapb_cb *lapb, int, int, int);
+void lapb_transmit_frmr(struct lapb_cb *lapb);
+
+/* lapb_timer.c */
+void lapb_start_t1timer(struct lapb_cb *lapb);
+void lapb_start_t2timer(struct lapb_cb *lapb);
+void lapb_stop_t1timer(struct lapb_cb *lapb);
+void lapb_stop_t2timer(struct lapb_cb *lapb);
+int lapb_t1timer_running(struct lapb_cb *lapb);
+
+/*
+ * Debug levels.
+ * 0 = Off
+ * 1 = State Changes
+ * 2 = Packets I/O and State Changes
+ * 3 = Hex dumps, Packets I/O and State Changes.
+ */
+#define LAPB_DEBUG 0
+
+#define lapb_dbg(level, fmt, ...) \
+do { \
+ if (level < LAPB_DEBUG) \
+ pr_debug(fmt, ##__VA_ARGS__); \
+} while (0)
+
+#endif