include/net/dn_nsp.h

   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
  18 void dn_nsp_send_data_ack(struct sock *sk);
  19 void dn_nsp_send_oth_ack(struct sock *sk);
  20 void dn_send_conn_ack(struct sock *sk);
  21 void dn_send_conn_conf(struct sock *sk, gfp_t gfp);
  22 void dn_nsp_send_disc(struct sock *sk, unsigned char type,
  23                       unsigned short reason, gfp_t gfp);
  24 void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type,
  25                         unsigned short reason);
  26 void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval);
  27 void dn_nsp_send_conninit(struct sock *sk, unsigned char flags);
  28
  29 void dn_nsp_output(struct sock *sk);
  30 int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb,
  31                             struct sk_buff_head *q, unsigned short acknum);
  32 void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, gfp_t gfp,
  33                        int oob);
  34 unsigned long dn_nsp_persist(struct sock *sk);
  35 int dn_nsp_xmit_timeout(struct sock *sk);
  36
  37 int dn_nsp_rx(struct sk_buff *);
  38 int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
  39
  40 struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
  41 struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock,
  42                                   long timeo, int *err);
  43
  44 #define NSP_REASON_OK 0         /* No error */
  45 #define NSP_REASON_NR 1         /* No resources */
  46 #define NSP_REASON_UN 2         /* Unrecognised node name */
  47 #define NSP_REASON_SD 3         /* Node shutting down */
  48 #define NSP_REASON_ID 4         /* Invalid destination end user */
  49 #define NSP_REASON_ER 5         /* End user lacks resources */
  50 #define NSP_REASON_OB 6         /* Object too busy */
  51 #define NSP_REASON_US 7         /* Unspecified error */
  52 #define NSP_REASON_TP 8         /* Third-Party abort */
  53 #define NSP_REASON_EA 9         /* End user has aborted the link */
  54 #define NSP_REASON_IF 10        /* Invalid node name format */
  55 #define NSP_REASON_LS 11        /* Local node shutdown */
  56 #define NSP_REASON_LL 32        /* Node lacks logical-link resources */
  57 #define NSP_REASON_LE 33        /* End user lacks logical-link resources */
  58 #define NSP_REASON_UR 34        /* Unacceptable RQSTRID or PASSWORD field */
  59 #define NSP_REASON_UA 36        /* Unacceptable ACCOUNT field */
  60 #define NSP_REASON_TM 38        /* End user timed out logical link */
  61 #define NSP_REASON_NU 39        /* Node unreachable */
  62 #define NSP_REASON_NL 41        /* No-link message */
  63 #define NSP_REASON_DC 42        /* Disconnect confirm */
  64 #define NSP_REASON_IO 43        /* Image data field overflow */
  65
  66 #define NSP_DISCINIT 0x38
  67 #define NSP_DISCCONF 0x48
  68
  69 /*------------------------- NSP - messages ------------------------------*/
  70 /* Data Messages */
  71 /*---------------*/
  72
  73 /* Data Messages    (data segment/interrupt/link service)               */
  74
  75 struct nsp_data_seg_msg {
  76         __u8   msgflg;
  77         __le16 dstaddr;
  78         __le16 srcaddr;
  79 } __packed;
  80
  81 struct nsp_data_opt_msg {
  82         __le16 acknum;
  83         __le16 segnum;
  84         __le16 lsflgs;
  85 } __packed;
  86
  87 struct nsp_data_opt_msg1 {
  88         __le16 acknum;
  89         __le16 segnum;
  90 } __packed;
  91
  92
  93 /* Acknowledgment Message (data/other data)                             */
  94 struct nsp_data_ack_msg {
  95         __u8   msgflg;
  96         __le16 dstaddr;
  97         __le16 srcaddr;
  98         __le16 acknum;
  99 } __packed;
 100
 101 /* Connect Acknowledgment Message */
 102 struct  nsp_conn_ack_msg {
 103         __u8 msgflg;
 104         __le16 dstaddr;
 105 } __packed;
 106
 107
 108 /* Connect Initiate/Retransmit Initiate/Connect Confirm */
 109 struct  nsp_conn_init_msg {
 110         __u8   msgflg;
 111 #define NSP_CI      0x18            /* Connect Initiate     */
 112 #define NSP_RCI     0x68            /* Retrans. Conn Init   */
 113         __le16 dstaddr;
 114         __le16 srcaddr;
 115         __u8   services;
 116 #define NSP_FC_NONE   0x00            /* Flow Control None    */
 117 #define NSP_FC_SRC    0x04            /* Seg Req. Count       */
 118 #define NSP_FC_SCMC   0x08            /* Sess. Control Mess   */
 119 #define NSP_FC_MASK   0x0c            /* FC type mask         */
 120         __u8   info;
 121         __le16 segsize;
 122 } __packed;
 123
 124 /* Disconnect Initiate/Disconnect Confirm */
 125 struct  nsp_disconn_init_msg {
 126         __u8   msgflg;
 127         __le16 dstaddr;
 128         __le16 srcaddr;
 129         __le16 reason;
 130 } __packed;
 131
 132
 133
 134 struct  srcobj_fmt {
 135         __u8   format;
 136         __u8   task;
 137         __le16 grpcode;
 138         __le16 usrcode;
 139         __u8   dlen;
 140 } __packed;
 141
 142 /*
 143  * A collection of functions for manipulating the sequence
 144  * numbers used in NSP. Similar in operation to the functions
 145  * of the same name in TCP.
 146  */
 147 static __inline__ int dn_before(__u16 seq1, __u16 seq2)
 148 {
 149         seq1 &= 0x0fff;
 150         seq2 &= 0x0fff;
 151
 152         return (int)((seq1 - seq2) & 0x0fff) > 2048;
 153 }
 154
 155
 156 static __inline__ int dn_after(__u16 seq1, __u16 seq2)
 157 {
 158         seq1 &= 0x0fff;
 159         seq2 &= 0x0fff;
 160
 161         return (int)((seq2 - seq1) & 0x0fff) > 2048;
 162 }
 163
 164 static __inline__ int dn_equal(__u16 seq1, __u16 seq2)
 165 {
 166         return ((seq1 ^ seq2) & 0x0fff) == 0;
 167 }
 168
 169 static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2)
 170 {
 171         return (dn_before(seq1, seq2) || dn_equal(seq1, seq2));
 172 }
 173
 174 static __inline__ void seq_add(__u16 *seq, __u16 off)
 175 {
 176         (*seq) += off;
 177         (*seq) &= 0x0fff;
 178 }
 179
 180 static __inline__ int seq_next(__u16 seq1, __u16 seq2)
 181 {
 182         return dn_equal(seq1 + 1, seq2);
 183 }
 184
 185 /*
 186  * Can we delay the ack ?
 187  */
 188 static __inline__ int sendack(__u16 seq)
 189 {
 190         return (int)((seq & 0x1000) ? 0 : 1);
 191 }
 192
 193 /*
 194  * Is socket congested ?
 195  */
 196 static __inline__ int dn_congested(struct sock *sk)
 197 {
 198         return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1);
 199 }
 200
 201 #define DN_MAX_NSP_DATA_HEADER (11)
 202
 203 #endif /* _NET_DN_NSP_H */