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1da177e4 LT |
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, int gfp); | |
23 | extern void dn_nsp_send_disc(struct sock *sk, unsigned char type, | |
24 | unsigned short reason, int 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, int 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, int 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 | { | |
75 | unsigned char msgflg __attribute__((packed)); | |
76 | unsigned short dstaddr __attribute__((packed)); | |
77 | unsigned short srcaddr __attribute__((packed)); | |
78 | }; | |
79 | ||
80 | struct nsp_data_opt_msg | |
81 | { | |
82 | unsigned short acknum __attribute__((packed)); | |
83 | unsigned short segnum __attribute__((packed)); | |
84 | unsigned short lsflgs __attribute__((packed)); | |
85 | }; | |
86 | ||
87 | struct nsp_data_opt_msg1 | |
88 | { | |
89 | unsigned short acknum __attribute__((packed)); | |
90 | unsigned short segnum __attribute__((packed)); | |
91 | }; | |
92 | ||
93 | ||
94 | /* Acknowledgment Message (data/other data) */ | |
95 | struct nsp_data_ack_msg | |
96 | { | |
97 | unsigned char msgflg __attribute__((packed)); | |
98 | unsigned short dstaddr __attribute__((packed)); | |
99 | unsigned short srcaddr __attribute__((packed)); | |
100 | unsigned short acknum __attribute__((packed)); | |
101 | }; | |
102 | ||
103 | /* Connect Acknowledgment Message */ | |
104 | struct nsp_conn_ack_msg | |
105 | { | |
106 | unsigned char msgflg __attribute__((packed)); | |
107 | unsigned short dstaddr __attribute__((packed)); | |
108 | }; | |
109 | ||
110 | ||
111 | /* Connect Initiate/Retransmit Initiate/Connect Confirm */ | |
112 | struct nsp_conn_init_msg | |
113 | { | |
114 | unsigned char msgflg __attribute__((packed)); | |
115 | #define NSP_CI 0x18 /* Connect Initiate */ | |
116 | #define NSP_RCI 0x68 /* Retrans. Conn Init */ | |
117 | unsigned short dstaddr __attribute__((packed)); | |
118 | unsigned short srcaddr __attribute__((packed)); | |
119 | unsigned char services __attribute__((packed)); | |
120 | #define NSP_FC_NONE 0x00 /* Flow Control None */ | |
121 | #define NSP_FC_SRC 0x04 /* Seg Req. Count */ | |
122 | #define NSP_FC_SCMC 0x08 /* Sess. Control Mess */ | |
123 | #define NSP_FC_MASK 0x0c /* FC type mask */ | |
124 | unsigned char info __attribute__((packed)); | |
125 | unsigned short segsize __attribute__((packed)); | |
126 | }; | |
127 | ||
128 | /* Disconnect Initiate/Disconnect Confirm */ | |
129 | struct nsp_disconn_init_msg | |
130 | { | |
131 | unsigned char msgflg __attribute__((packed)); | |
132 | unsigned short dstaddr __attribute__((packed)); | |
133 | unsigned short srcaddr __attribute__((packed)); | |
134 | unsigned short reason __attribute__((packed)); | |
135 | }; | |
136 | ||
137 | ||
138 | ||
139 | struct srcobj_fmt | |
140 | { | |
141 | char format __attribute__((packed)); | |
142 | unsigned char task __attribute__((packed)); | |
143 | unsigned short grpcode __attribute__((packed)); | |
144 | unsigned short usrcode __attribute__((packed)); | |
145 | char dlen __attribute__((packed)); | |
146 | }; | |
147 | ||
148 | /* | |
149 | * A collection of functions for manipulating the sequence | |
150 | * numbers used in NSP. Similar in operation to the functions | |
151 | * of the same name in TCP. | |
152 | */ | |
153 | static __inline__ int dn_before(unsigned short seq1, unsigned short seq2) | |
154 | { | |
155 | seq1 &= 0x0fff; | |
156 | seq2 &= 0x0fff; | |
157 | ||
158 | return (int)((seq1 - seq2) & 0x0fff) > 2048; | |
159 | } | |
160 | ||
161 | ||
162 | static __inline__ int dn_after(unsigned short seq1, unsigned short seq2) | |
163 | { | |
164 | seq1 &= 0x0fff; | |
165 | seq2 &= 0x0fff; | |
166 | ||
167 | return (int)((seq2 - seq1) & 0x0fff) > 2048; | |
168 | } | |
169 | ||
170 | static __inline__ int dn_equal(unsigned short seq1, unsigned short seq2) | |
171 | { | |
172 | return ((seq1 ^ seq2) & 0x0fff) == 0; | |
173 | } | |
174 | ||
175 | static __inline__ int dn_before_or_equal(unsigned short seq1, unsigned short seq2) | |
176 | { | |
177 | return (dn_before(seq1, seq2) || dn_equal(seq1, seq2)); | |
178 | } | |
179 | ||
180 | static __inline__ void seq_add(unsigned short *seq, unsigned short off) | |
181 | { | |
182 | (*seq) += off; | |
183 | (*seq) &= 0x0fff; | |
184 | } | |
185 | ||
186 | static __inline__ int seq_next(unsigned short seq1, unsigned short seq2) | |
187 | { | |
188 | return dn_equal(seq1 + 1, seq2); | |
189 | } | |
190 | ||
191 | /* | |
192 | * Can we delay the ack ? | |
193 | */ | |
194 | static __inline__ int sendack(unsigned short seq) | |
195 | { | |
196 | return (int)((seq & 0x1000) ? 0 : 1); | |
197 | } | |
198 | ||
199 | /* | |
200 | * Is socket congested ? | |
201 | */ | |
202 | static __inline__ int dn_congested(struct sock *sk) | |
203 | { | |
204 | return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1); | |
205 | } | |
206 | ||
207 | #define DN_MAX_NSP_DATA_HEADER (11) | |
208 | ||
209 | #endif /* _NET_DN_NSP_H */ |