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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 */