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 extern void dn_nsp_send_data_ack(struct sock *sk);
  19 extern void dn_nsp_send_oth_ack(struct sock *sk);
  20 extern void dn_nsp_delayed_ack(struct sock *sk);
  21 extern void dn_send_conn_ack(struct sock *sk);
  22 extern void dn_send_conn_conf(struct sock *sk, gfp_t gfp);
  23 extern void dn_nsp_send_disc(struct sock *sk, unsigned char type,
  24                         unsigned short reason, gfp_t gfp);
  25 extern void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type,
  26                                 unsigned short reason);
  27 extern void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval);
  28 extern void dn_nsp_send_conninit(struct sock *sk, unsigned char flags);
  29
  30 extern void dn_nsp_output(struct sock *sk);
  31 extern int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum);
  32 extern void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, gfp_t gfp, int oob);
  33 extern unsigned long dn_nsp_persist(struct sock *sk);
  34 extern int dn_nsp_xmit_timeout(struct sock *sk);
  35
  36 extern int dn_nsp_rx(struct sk_buff *);
  37 extern int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
  38
  39 extern struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
  40 extern 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
  73 struct nsp_data_seg_msg {
  74         __u8   msgflg;
  75         __le16 dstaddr;
  76         __le16 srcaddr;
  77 } __packed;
  78
  79 struct nsp_data_opt_msg {
  80         __le16 acknum;
  81         __le16 segnum;
  82         __le16 lsflgs;
  83 } __packed;
  84
  85 struct nsp_data_opt_msg1 {
  86         __le16 acknum;
  87         __le16 segnum;
  88 } __packed;
  89
  90
  91 /* Acknowledgment Message (data/other data)                             */
  92 struct nsp_data_ack_msg {
  93         __u8   msgflg;
  94         __le16 dstaddr;
  95         __le16 srcaddr;
  96         __le16 acknum;
  97 } __packed;
  98
  99 /* Connect Acknowledgment Message */
 100 struct  nsp_conn_ack_msg {
 101         __u8 msgflg;
 102         __le16 dstaddr;
 103 } __packed;
 104
 105
 106 /* Connect Initiate/Retransmit Initiate/Connect Confirm */
 107 struct  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 */
 123 struct  nsp_disconn_init_msg {
 124         __u8   msgflg;
 125         __le16 dstaddr;
 126         __le16 srcaddr;
 127         __le16 reason;
 128 } __packed;
 129
 130
 131
 132 struct  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  */
 145 static __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
 154 static __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
 162 static __inline__ int dn_equal(__u16 seq1, __u16 seq2)
 163 {
 164         return ((seq1 ^ seq2) & 0x0fff) == 0;
 165 }
 166
 167 static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2)
 168 {
 169         return (dn_before(seq1, seq2) || dn_equal(seq1, seq2));
 170 }
 171
 172 static __inline__ void seq_add(__u16 *seq, __u16 off)
 173 {
 174         (*seq) += off;
 175         (*seq) &= 0x0fff;
 176 }
 177
 178 static __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  */
 186 static __inline__ int sendack(__u16 seq)
 187 {
 188         return (int)((seq & 0x1000) ? 0 : 1);
 189 }
 190
 191 /*
 192  * Is socket congested ?
 193  */
 194 static __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 */