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