210 lines
7.3 KiB
C
210 lines
7.3 KiB
C
#ifndef _NET_DN_NSP_H
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#define _NET_DN_NSP_H
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/******************************************************************************
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(c) 1995-1998 E.M. Serrat emserrat@geocities.com
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*******************************************************************************/
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/* dn_nsp.c functions prototyping */
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extern void dn_nsp_send_data_ack(struct sock *sk);
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extern void dn_nsp_send_oth_ack(struct sock *sk);
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extern void dn_nsp_delayed_ack(struct sock *sk);
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extern void dn_send_conn_ack(struct sock *sk);
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extern void dn_send_conn_conf(struct sock *sk, int gfp);
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extern void dn_nsp_send_disc(struct sock *sk, unsigned char type,
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unsigned short reason, int gfp);
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extern void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type,
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unsigned short reason);
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extern void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval);
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extern void dn_nsp_send_conninit(struct sock *sk, unsigned char flags);
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extern void dn_nsp_output(struct sock *sk);
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extern int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum);
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extern void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, int gfp, int oob);
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extern unsigned long dn_nsp_persist(struct sock *sk);
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extern int dn_nsp_xmit_timeout(struct sock *sk);
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extern int dn_nsp_rx(struct sk_buff *);
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extern int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
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extern struct sk_buff *dn_alloc_skb(struct sock *sk, int size, int pri);
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extern struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, long timeo, int *err);
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#define NSP_REASON_OK 0 /* No error */
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#define NSP_REASON_NR 1 /* No resources */
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#define NSP_REASON_UN 2 /* Unrecognised node name */
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#define NSP_REASON_SD 3 /* Node shutting down */
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#define NSP_REASON_ID 4 /* Invalid destination end user */
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#define NSP_REASON_ER 5 /* End user lacks resources */
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#define NSP_REASON_OB 6 /* Object too busy */
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#define NSP_REASON_US 7 /* Unspecified error */
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#define NSP_REASON_TP 8 /* Third-Party abort */
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#define NSP_REASON_EA 9 /* End user has aborted the link */
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#define NSP_REASON_IF 10 /* Invalid node name format */
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#define NSP_REASON_LS 11 /* Local node shutdown */
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#define NSP_REASON_LL 32 /* Node lacks logical-link resources */
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#define NSP_REASON_LE 33 /* End user lacks logical-link resources */
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#define NSP_REASON_UR 34 /* Unacceptable RQSTRID or PASSWORD field */
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#define NSP_REASON_UA 36 /* Unacceptable ACCOUNT field */
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#define NSP_REASON_TM 38 /* End user timed out logical link */
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#define NSP_REASON_NU 39 /* Node unreachable */
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#define NSP_REASON_NL 41 /* No-link message */
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#define NSP_REASON_DC 42 /* Disconnect confirm */
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#define NSP_REASON_IO 43 /* Image data field overflow */
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#define NSP_DISCINIT 0x38
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#define NSP_DISCCONF 0x48
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/*------------------------- NSP - messages ------------------------------*/
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/* Data Messages */
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/*---------------*/
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/* Data Messages (data segment/interrupt/link service) */
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struct nsp_data_seg_msg
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{
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unsigned char msgflg __attribute__((packed));
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unsigned short dstaddr __attribute__((packed));
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unsigned short srcaddr __attribute__((packed));
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};
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struct nsp_data_opt_msg
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{
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unsigned short acknum __attribute__((packed));
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unsigned short segnum __attribute__((packed));
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unsigned short lsflgs __attribute__((packed));
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};
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struct nsp_data_opt_msg1
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{
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unsigned short acknum __attribute__((packed));
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unsigned short segnum __attribute__((packed));
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};
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/* Acknowledgment Message (data/other data) */
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struct nsp_data_ack_msg
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{
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unsigned char msgflg __attribute__((packed));
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unsigned short dstaddr __attribute__((packed));
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unsigned short srcaddr __attribute__((packed));
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unsigned short acknum __attribute__((packed));
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};
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/* Connect Acknowledgment Message */
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struct nsp_conn_ack_msg
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{
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unsigned char msgflg __attribute__((packed));
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unsigned short dstaddr __attribute__((packed));
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};
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/* Connect Initiate/Retransmit Initiate/Connect Confirm */
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struct nsp_conn_init_msg
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{
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unsigned char msgflg __attribute__((packed));
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#define NSP_CI 0x18 /* Connect Initiate */
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#define NSP_RCI 0x68 /* Retrans. Conn Init */
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unsigned short dstaddr __attribute__((packed));
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unsigned short srcaddr __attribute__((packed));
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unsigned char services __attribute__((packed));
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#define NSP_FC_NONE 0x00 /* Flow Control None */
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#define NSP_FC_SRC 0x04 /* Seg Req. Count */
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#define NSP_FC_SCMC 0x08 /* Sess. Control Mess */
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#define NSP_FC_MASK 0x0c /* FC type mask */
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unsigned char info __attribute__((packed));
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unsigned short segsize __attribute__((packed));
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};
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/* Disconnect Initiate/Disconnect Confirm */
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struct nsp_disconn_init_msg
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{
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unsigned char msgflg __attribute__((packed));
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unsigned short dstaddr __attribute__((packed));
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unsigned short srcaddr __attribute__((packed));
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unsigned short reason __attribute__((packed));
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};
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struct srcobj_fmt
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{
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char format __attribute__((packed));
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unsigned char task __attribute__((packed));
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unsigned short grpcode __attribute__((packed));
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unsigned short usrcode __attribute__((packed));
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char dlen __attribute__((packed));
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};
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/*
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* A collection of functions for manipulating the sequence
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* numbers used in NSP. Similar in operation to the functions
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* of the same name in TCP.
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*/
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static __inline__ int dn_before(unsigned short seq1, unsigned short seq2)
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{
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seq1 &= 0x0fff;
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seq2 &= 0x0fff;
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return (int)((seq1 - seq2) & 0x0fff) > 2048;
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}
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static __inline__ int dn_after(unsigned short seq1, unsigned short seq2)
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{
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seq1 &= 0x0fff;
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seq2 &= 0x0fff;
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return (int)((seq2 - seq1) & 0x0fff) > 2048;
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}
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static __inline__ int dn_equal(unsigned short seq1, unsigned short seq2)
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{
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return ((seq1 ^ seq2) & 0x0fff) == 0;
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}
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static __inline__ int dn_before_or_equal(unsigned short seq1, unsigned short seq2)
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{
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return (dn_before(seq1, seq2) || dn_equal(seq1, seq2));
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}
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static __inline__ void seq_add(unsigned short *seq, unsigned short off)
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{
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(*seq) += off;
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(*seq) &= 0x0fff;
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}
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static __inline__ int seq_next(unsigned short seq1, unsigned short seq2)
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{
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return dn_equal(seq1 + 1, seq2);
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}
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/*
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* Can we delay the ack ?
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*/
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static __inline__ int sendack(unsigned short seq)
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{
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return (int)((seq & 0x1000) ? 0 : 1);
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}
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/*
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* Is socket congested ?
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*/
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static __inline__ int dn_congested(struct sock *sk)
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{
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return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1);
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}
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#define DN_MAX_NSP_DATA_HEADER (11)
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#endif /* _NET_DN_NSP_H */
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