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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 
 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 */
205 

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