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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 [email protected]
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 */
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