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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 | ||
59ddd965 JP |
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); | |
1da177e4 | 29 | |
59ddd965 JP |
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); | |
1da177e4 | 37 | |
59ddd965 JP |
38 | int dn_nsp_rx(struct sk_buff *); |
39 | int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 40 | |
59ddd965 JP |
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); | |
1da177e4 LT |
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 | ||
fd2c3ef7 | 76 | struct nsp_data_seg_msg { |
c4ea94ab SW |
77 | __u8 msgflg; |
78 | __le16 dstaddr; | |
79 | __le16 srcaddr; | |
bc10502d | 80 | } __packed; |
1da177e4 | 81 | |
fd2c3ef7 | 82 | struct nsp_data_opt_msg { |
c4ea94ab SW |
83 | __le16 acknum; |
84 | __le16 segnum; | |
85 | __le16 lsflgs; | |
bc10502d | 86 | } __packed; |
1da177e4 | 87 | |
fd2c3ef7 | 88 | struct nsp_data_opt_msg1 { |
c4ea94ab SW |
89 | __le16 acknum; |
90 | __le16 segnum; | |
bc10502d | 91 | } __packed; |
1da177e4 LT |
92 | |
93 | ||
94 | /* Acknowledgment Message (data/other data) */ | |
fd2c3ef7 | 95 | struct nsp_data_ack_msg { |
c4ea94ab SW |
96 | __u8 msgflg; |
97 | __le16 dstaddr; | |
98 | __le16 srcaddr; | |
99 | __le16 acknum; | |
bc10502d | 100 | } __packed; |
1da177e4 LT |
101 | |
102 | /* Connect Acknowledgment Message */ | |
fd2c3ef7 | 103 | struct nsp_conn_ack_msg { |
c4ea94ab SW |
104 | __u8 msgflg; |
105 | __le16 dstaddr; | |
bc10502d | 106 | } __packed; |
1da177e4 LT |
107 | |
108 | ||
109 | /* Connect Initiate/Retransmit Initiate/Connect Confirm */ | |
fd2c3ef7 | 110 | struct nsp_conn_init_msg { |
c4ea94ab | 111 | __u8 msgflg; |
1da177e4 LT |
112 | #define NSP_CI 0x18 /* Connect Initiate */ |
113 | #define NSP_RCI 0x68 /* Retrans. Conn Init */ | |
c4ea94ab SW |
114 | __le16 dstaddr; |
115 | __le16 srcaddr; | |
116 | __u8 services; | |
1da177e4 LT |
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 */ | |
c4ea94ab SW |
121 | __u8 info; |
122 | __le16 segsize; | |
bc10502d | 123 | } __packed; |
1da177e4 LT |
124 | |
125 | /* Disconnect Initiate/Disconnect Confirm */ | |
fd2c3ef7 | 126 | struct nsp_disconn_init_msg { |
c4ea94ab SW |
127 | __u8 msgflg; |
128 | __le16 dstaddr; | |
129 | __le16 srcaddr; | |
130 | __le16 reason; | |
bc10502d | 131 | } __packed; |
1da177e4 LT |
132 | |
133 | ||
134 | ||
fd2c3ef7 | 135 | struct srcobj_fmt { |
c4ea94ab SW |
136 | __u8 format; |
137 | __u8 task; | |
138 | __le16 grpcode; | |
139 | __le16 usrcode; | |
140 | __u8 dlen; | |
bc10502d | 141 | } __packed; |
1da177e4 LT |
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 | */ | |
c4ea94ab | 148 | static __inline__ int dn_before(__u16 seq1, __u16 seq2) |
1da177e4 LT |
149 | { |
150 | seq1 &= 0x0fff; | |
151 | seq2 &= 0x0fff; | |
152 | ||
153 | return (int)((seq1 - seq2) & 0x0fff) > 2048; | |
154 | } | |
155 | ||
156 | ||
c4ea94ab | 157 | static __inline__ int dn_after(__u16 seq1, __u16 seq2) |
1da177e4 LT |
158 | { |
159 | seq1 &= 0x0fff; | |
160 | seq2 &= 0x0fff; | |
161 | ||
162 | return (int)((seq2 - seq1) & 0x0fff) > 2048; | |
163 | } | |
164 | ||
c4ea94ab | 165 | static __inline__ int dn_equal(__u16 seq1, __u16 seq2) |
1da177e4 LT |
166 | { |
167 | return ((seq1 ^ seq2) & 0x0fff) == 0; | |
168 | } | |
169 | ||
c4ea94ab | 170 | static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2) |
1da177e4 LT |
171 | { |
172 | return (dn_before(seq1, seq2) || dn_equal(seq1, seq2)); | |
173 | } | |
174 | ||
c4ea94ab | 175 | static __inline__ void seq_add(__u16 *seq, __u16 off) |
1da177e4 LT |
176 | { |
177 | (*seq) += off; | |
178 | (*seq) &= 0x0fff; | |
179 | } | |
180 | ||
c4ea94ab | 181 | static __inline__ int seq_next(__u16 seq1, __u16 seq2) |
1da177e4 LT |
182 | { |
183 | return dn_equal(seq1 + 1, seq2); | |
184 | } | |
185 | ||
186 | /* | |
187 | * Can we delay the ack ? | |
188 | */ | |
c4ea94ab | 189 | static __inline__ int sendack(__u16 seq) |
1da177e4 LT |
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 */ |