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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 */
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