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#ifndef _NET_DN_NSP_H

#define _NET_DN_NSP_H

/******************************************************************************

    (c) 1995-1998 E.M. Serrat           emserrat@geocities.com

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation; either version 2 of the License, or

    any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

*******************************************************************************/

/* dn_nsp.c functions prototyping */

extern void dn_nsp_send_data_ack(struct sock *sk);

extern void dn_nsp_send_oth_ack(struct sock *sk);

extern void dn_nsp_delayed_ack(struct sock *sk);

extern void dn_send_conn_ack(struct sock *sk);

extern void dn_send_conn_conf(struct sock *sk, int gfp);

extern void dn_nsp_send_disc(struct sock *sk, unsigned char type,

                                unsigned short reason, int gfp);

extern void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type,

                                unsigned short reason);

extern void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval);

extern void dn_nsp_send_conninit(struct sock *sk, unsigned char flags);

extern void dn_nsp_output(struct sock *sk);

extern int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum);

extern void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, int gfp, int oob);

extern unsigned long dn_nsp_persist(struct sock *sk);

extern int dn_nsp_xmit_timeout(struct sock *sk);

extern int dn_nsp_rx(struct sk_buff *);

extern int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb);

extern struct sk_buff *dn_alloc_skb(struct sock *sk, int size, int pri);

extern struct sk_buff *dn_alloc_send_skb(struct sock *sk, int *size, int noblock, int *err);

#define NSP_REASON_OK 0         /* No error */

#define NSP_REASON_NR 1         /* No resources */

#define NSP_REASON_UN 2         /* Unrecognised node name */

#define NSP_REASON_SD 3         /* Node shutting down */

#define NSP_REASON_ID 4         /* Invalid destination end user */

#define NSP_REASON_ER 5         /* End user lacks resources */

#define NSP_REASON_OB 6         /* Object too busy */

#define NSP_REASON_US 7         /* Unspecified error */

#define NSP_REASON_TP 8         /* Third-Party abort */

#define NSP_REASON_EA 9         /* End user has aborted the link */

#define NSP_REASON_IF 10        /* Invalid node name format */

#define NSP_REASON_LS 11        /* Local node shutdown */

#define NSP_REASON_LL 32        /* Node lacks logical-link resources */

#define NSP_REASON_LE 33        /* End user lacks logical-link resources */

#define NSP_REASON_UR 34        /* Unacceptable RQSTRID or PASSWORD field */

#define NSP_REASON_UA 36        /* Unacceptable ACCOUNT field */

#define NSP_REASON_TM 38        /* End user timed out logical link */

#define NSP_REASON_NU 39        /* Node unreachable */

#define NSP_REASON_NL 41        /* No-link message */

#define NSP_REASON_DC 42        /* Disconnect confirm */

#define NSP_REASON_IO 43        /* Image data field overflow */

#define NSP_DISCINIT 0x38

#define NSP_DISCCONF 0x48

/*------------------------- NSP - messages ------------------------------*/

/* Data Messages */

/*---------------*/

/* Data Messages    (data segment/interrupt/link service)               */

struct nsp_data_seg_msg

{

        unsigned char   msgflg          __attribute__((packed));

        unsigned short  dstaddr         __attribute__((packed));

        unsigned short  srcaddr         __attribute__((packed));

};

struct nsp_data_opt_msg

{

        unsigned short  acknum          __attribute__((packed));

        unsigned short  segnum          __attribute__((packed));

        unsigned short  lsflgs          __attribute__((packed));

};

struct nsp_data_opt_msg1

{

        unsigned short  acknum          __attribute__((packed));

        unsigned short  segnum          __attribute__((packed));

};

/* Acknowledgment Message (data/other data)                             */

struct nsp_data_ack_msg

{

        unsigned char   msgflg          __attribute__((packed));

        unsigned short  dstaddr         __attribute__((packed));

        unsigned short  srcaddr         __attribute__((packed));

        unsigned short  acknum          __attribute__((packed));

};

/* Connect Acknowledgment Message */

struct  nsp_conn_ack_msg

{

        unsigned char   msgflg          __attribute__((packed));

        unsigned short  dstaddr         __attribute__((packed));

};

/* Connect Initiate/Retransmit Initiate/Connect Confirm */

struct  nsp_conn_init_msg

{

        unsigned char   msgflg          __attribute__((packed));

#define NSP_CI      0x18            /* Connect Initiate     */

#define NSP_RCI     0x68            /* Retrans. Conn Init   */

        unsigned short  dstaddr         __attribute__((packed));

        unsigned short  srcaddr         __attribute__((packed));

        unsigned char   services        __attribute__((packed));

#define NSP_FC_NONE   0x00            /* Flow Control None    */

#define NSP_FC_SRC    0x04            /* Seg Req. Count       */

#define NSP_FC_SCMC   0x08            /* Sess. Control Mess   */

#define NSP_FC_MASK   0x0c            /* FC type mask         */

        unsigned char   info            __attribute__((packed));

        unsigned short  segsize         __attribute__((packed));

};

/* Disconnect Initiate/Disconnect Confirm */

struct  nsp_disconn_init_msg

{

        unsigned char   msgflg          __attribute__((packed));

        unsigned short  dstaddr         __attribute__((packed));

        unsigned short  srcaddr         __attribute__((packed));

        unsigned short  reason          __attribute__((packed));

};

struct  srcobj_fmt

{

        char            format          __attribute__((packed));

        unsigned char   task            __attribute__((packed));

        unsigned short  grpcode         __attribute__((packed));

        unsigned short  usrcode         __attribute__((packed));

        char            dlen            __attribute__((packed));

};

/*

 * A collection of functions for manipulating the sequence

 * numbers used in NSP. Similar in operation to the functions

 * of the same name in TCP.

 */

static __inline__ int before(unsigned short seq1, unsigned short seq2)

{

        seq1 &= 0x0fff;

        seq2 &= 0x0fff;

        return (int)((seq1 - seq2) & 0x0fff) > 2048;

}

static __inline__ int after(unsigned short seq1, unsigned short seq2)

{

        seq1 &= 0x0fff;

        seq2 &= 0x0fff;

        return (int)((seq2 - seq1) & 0x0fff) > 2048;

}

static __inline__ int equal(unsigned short seq1, unsigned short seq2)

{

        return ((seq1 ^ seq2) & 0x0fff) == 0;

}

static __inline__ int before_or_equal(unsigned short seq1, unsigned short seq2)

{

        return (before(seq1, seq2) || equal(seq1, seq2));

}

static __inline__ void seq_add(unsigned short *seq, unsigned short off)

{

        (*seq) += off;

        (*seq) &= 0x0fff;

}

static __inline__ int seq_next(unsigned short seq1, unsigned short seq2)

{

        return equal(seq1 + 1, seq2);

}

/*

 * Can we delay the ack ?

 */

static __inline__ int sendack(unsigned short seq)

{

        return (int)((seq & 0x1000) ? 0 : 1);

}

/*

 * Is socket congested ?

 */

static __inline__ int dn_congested(struct sock *sk)

{

        return atomic_read(&sk->rmem_alloc) > (sk->rcvbuf >> 1);

}

#endif /* _NET_DN_NSP_H */