linux/include/net/dn_nsp.h
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   1#ifndef _NET_DN_NSP_H
   2#define _NET_DN_NSP_H
   3/******************************************************************************
   4    (c) 1995-1998 E.M. Serrat           emserrat@geocities.com
   5    
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15*******************************************************************************/
  16/* dn_nsp.c functions prototyping */
  17
  18extern void dn_nsp_send_data_ack(struct sock *sk);
  19extern void dn_nsp_send_oth_ack(struct sock *sk);
  20extern void dn_nsp_delayed_ack(struct sock *sk);
  21extern void dn_send_conn_ack(struct sock *sk);
  22extern void dn_send_conn_conf(struct sock *sk, gfp_t gfp);
  23extern void dn_nsp_send_disc(struct sock *sk, unsigned char type, 
  24                        unsigned short reason, gfp_t gfp);
  25extern void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type,
  26                                unsigned short reason);
  27extern void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval);
  28extern void dn_nsp_send_conninit(struct sock *sk, unsigned char flags);
  29
  30extern void dn_nsp_output(struct sock *sk);
  31extern int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum);
  32extern void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, gfp_t gfp, int oob);
  33extern unsigned long dn_nsp_persist(struct sock *sk);
  34extern int dn_nsp_xmit_timeout(struct sock *sk);
  35
  36extern int dn_nsp_rx(struct sk_buff *);
  37extern int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
  38
  39extern struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
  40extern struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, long timeo, int *err);
  41
  42#define NSP_REASON_OK 0         /* No error */
  43#define NSP_REASON_NR 1         /* No resources */
  44#define NSP_REASON_UN 2         /* Unrecognised node name */
  45#define NSP_REASON_SD 3         /* Node shutting down */
  46#define NSP_REASON_ID 4         /* Invalid destination end user */
  47#define NSP_REASON_ER 5         /* End user lacks resources */
  48#define NSP_REASON_OB 6         /* Object too busy */
  49#define NSP_REASON_US 7         /* Unspecified error */
  50#define NSP_REASON_TP 8         /* Third-Party abort */
  51#define NSP_REASON_EA 9         /* End user has aborted the link */
  52#define NSP_REASON_IF 10        /* Invalid node name format */
  53#define NSP_REASON_LS 11        /* Local node shutdown */
  54#define NSP_REASON_LL 32        /* Node lacks logical-link resources */
  55#define NSP_REASON_LE 33        /* End user lacks logical-link resources */
  56#define NSP_REASON_UR 34        /* Unacceptable RQSTRID or PASSWORD field */
  57#define NSP_REASON_UA 36        /* Unacceptable ACCOUNT field */
  58#define NSP_REASON_TM 38        /* End user timed out logical link */
  59#define NSP_REASON_NU 39        /* Node unreachable */
  60#define NSP_REASON_NL 41        /* No-link message */
  61#define NSP_REASON_DC 42        /* Disconnect confirm */
  62#define NSP_REASON_IO 43        /* Image data field overflow */
  63
  64#define NSP_DISCINIT 0x38
  65#define NSP_DISCCONF 0x48
  66
  67/*------------------------- NSP - messages ------------------------------*/
  68/* Data Messages */
  69/*---------------*/
  70
  71/* Data Messages    (data segment/interrupt/link service)               */
  72
  73struct nsp_data_seg_msg {
  74        __u8   msgflg;
  75        __le16 dstaddr;
  76        __le16 srcaddr;
  77} __packed;
  78
  79struct nsp_data_opt_msg {
  80        __le16 acknum;
  81        __le16 segnum;
  82        __le16 lsflgs;
  83} __packed;
  84
  85struct nsp_data_opt_msg1 {
  86        __le16 acknum;
  87        __le16 segnum;
  88} __packed;
  89
  90
  91/* Acknowledgment Message (data/other data)                             */
  92struct nsp_data_ack_msg {
  93        __u8   msgflg;
  94        __le16 dstaddr;
  95        __le16 srcaddr;
  96        __le16 acknum;
  97} __packed;
  98
  99/* Connect Acknowledgment Message */
 100struct  nsp_conn_ack_msg {
 101        __u8 msgflg;
 102        __le16 dstaddr;
 103} __packed;
 104
 105
 106/* Connect Initiate/Retransmit Initiate/Connect Confirm */
 107struct  nsp_conn_init_msg {
 108        __u8   msgflg;
 109#define NSP_CI      0x18            /* Connect Initiate     */
 110#define NSP_RCI     0x68            /* Retrans. Conn Init   */
 111        __le16 dstaddr;
 112        __le16 srcaddr;
 113        __u8   services;
 114#define NSP_FC_NONE   0x00            /* Flow Control None    */
 115#define NSP_FC_SRC    0x04            /* Seg Req. Count       */
 116#define NSP_FC_SCMC   0x08            /* Sess. Control Mess   */
 117#define NSP_FC_MASK   0x0c            /* FC type mask         */
 118        __u8   info;
 119        __le16 segsize;
 120} __packed;
 121
 122/* Disconnect Initiate/Disconnect Confirm */
 123struct  nsp_disconn_init_msg {
 124        __u8   msgflg;
 125        __le16 dstaddr;
 126        __le16 srcaddr;
 127        __le16 reason;
 128} __packed;
 129
 130
 131
 132struct  srcobj_fmt {
 133        __u8   format;
 134        __u8   task;
 135        __le16 grpcode;
 136        __le16 usrcode;
 137        __u8   dlen;
 138} __packed;
 139
 140/*
 141 * A collection of functions for manipulating the sequence
 142 * numbers used in NSP. Similar in operation to the functions
 143 * of the same name in TCP.
 144 */
 145static __inline__ int dn_before(__u16 seq1, __u16 seq2)
 146{
 147        seq1 &= 0x0fff;
 148        seq2 &= 0x0fff;
 149
 150        return (int)((seq1 - seq2) & 0x0fff) > 2048;
 151}
 152
 153
 154static __inline__ int dn_after(__u16 seq1, __u16 seq2)
 155{
 156        seq1 &= 0x0fff;
 157        seq2 &= 0x0fff;
 158
 159        return (int)((seq2 - seq1) & 0x0fff) > 2048;
 160}
 161
 162static __inline__ int dn_equal(__u16 seq1, __u16 seq2)
 163{
 164        return ((seq1 ^ seq2) & 0x0fff) == 0;
 165}
 166
 167static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2)
 168{
 169        return (dn_before(seq1, seq2) || dn_equal(seq1, seq2));
 170}
 171
 172static __inline__ void seq_add(__u16 *seq, __u16 off)
 173{
 174        (*seq) += off;
 175        (*seq) &= 0x0fff;
 176}
 177
 178static __inline__ int seq_next(__u16 seq1, __u16 seq2)
 179{
 180        return dn_equal(seq1 + 1, seq2);
 181}
 182
 183/*
 184 * Can we delay the ack ?
 185 */
 186static __inline__ int sendack(__u16 seq)
 187{
 188        return (int)((seq & 0x1000) ? 0 : 1);
 189}
 190
 191/*
 192 * Is socket congested ?
 193 */
 194static __inline__ int dn_congested(struct sock *sk)
 195{
 196        return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1);
 197}
 198
 199#define DN_MAX_NSP_DATA_HEADER (11)
 200
 201#endif /* _NET_DN_NSP_H */
 202
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