/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Layer 2 defines
 *
 * Copyright 2008  by Karsten Keil <kkeil@novell.com>
 */

#include <linux/mISDNif.h>
#include <linux/skbuff.h>
#include "fsm.h"

#define MAX_WINDOW      8

struct manager {
        struct mISDNchannel     ch;
        struct mISDNchannel     bcast;
        u_long                  options;
        struct list_head        layer2;
        rwlock_t                lock;
        struct FsmInst          deact;
        struct FsmTimer         datimer;
        struct sk_buff_head     sendq;
        struct mISDNchannel     *up;
        u_int                   nextid;
        u_int                   lastid;
};

struct teimgr {
        int                     ri;
        int                     rcnt;
        struct FsmInst          tei_m;
        struct FsmTimer         timer;
        int                     tval, nval;
        struct layer2           *l2;
        struct manager          *mgr;
};

struct laddr {
        u_char  A;
        u_char  B;
};

struct layer2 {
        struct list_head        list;
        struct mISDNchannel     ch;
        u_long                  flag;
        int                     id;
        struct mISDNchannel     *up;
        signed char             sapi;
        signed char             tei;
        struct laddr            addr;
        u_int                   maxlen;
        struct teimgr           *tm;
        u_int                   vs, va, vr;
        int                     rc;
        u_int                   window;
        u_int                   sow;
        struct FsmInst          l2m;
        struct FsmTimer         t200, t203;
        int                     T200, N200, T203;
        u_int                   next_id;
        u_int                   down_id;
        struct sk_buff          *windowar[MAX_WINDOW];
        struct sk_buff_head     i_queue;
        struct sk_buff_head     ui_queue;
        struct sk_buff_head     down_queue;
        struct sk_buff_head     tmp_queue;
};

enum {
        ST_L2_1,
        ST_L2_2,
        ST_L2_3,
        ST_L2_4,
        ST_L2_5,
        ST_L2_6,
        ST_L2_7,
        ST_L2_8,
};

#define L2_STATE_COUNT (ST_L2_8 + 1)

extern struct layer2    *create_l2(struct mISDNchannel *, u_int,
                                   u_long, int, int);
extern int              tei_l2(struct layer2 *, u_int, u_long arg);


/* from tei.c */
extern int              l2_tei(struct layer2 *, u_int, u_long arg);
extern void             TEIrelease(struct layer2 *);
extern int              TEIInit(u_int *);
extern void             TEIFree(void);

#define MAX_L2HEADER_LEN 4

#define RR      0x01
#define RNR     0x05
#define REJ     0x09
#define SABME   0x6f
#define SABM    0x2f
#define DM      0x0f
#define UI      0x03
#define DISC    0x43
#define UA      0x63
#define FRMR    0x87
#define XID     0xaf

#define CMD     0
#define RSP     1

#define LC_FLUSH_WAIT 1

#define FLG_LAPB        0
#define FLG_LAPD        1
#define FLG_ORIG        2
#define FLG_MOD128      3
#define FLG_PEND_REL    4
#define FLG_L3_INIT     5
#define FLG_T200_RUN    6
#define FLG_ACK_PEND    7
#define FLG_REJEXC      8
#define FLG_OWN_BUSY    9
#define FLG_PEER_BUSY   10
#define FLG_DCHAN_BUSY  11
#define FLG_L1_ACTIV    12
#define FLG_ESTAB_PEND  13
#define FLG_PTP         14
#define FLG_FIXED_TEI   15
#define FLG_L2BLOCK     16
#define FLG_L1_NOTREADY 17
#define FLG_LAPD_NET    18