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TOMOYO Linux Cross Reference
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 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 */
202 

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