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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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