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fd9871f7 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | #ifndef _NET_DN_NSP_H |
3 | #define _NET_DN_NSP_H | |
4 | /****************************************************************************** | |
5 | (c) 1995-1998 E.M. Serrat emserrat@geocities.com | |
6 | ||
1da177e4 LT |
7 | *******************************************************************************/ |
8 | /* dn_nsp.c functions prototyping */ | |
9 | ||
59ddd965 JP |
10 | void dn_nsp_send_data_ack(struct sock *sk); |
11 | void dn_nsp_send_oth_ack(struct sock *sk); | |
59ddd965 JP |
12 | void dn_send_conn_ack(struct sock *sk); |
13 | void dn_send_conn_conf(struct sock *sk, gfp_t gfp); | |
14 | void dn_nsp_send_disc(struct sock *sk, unsigned char type, | |
15 | unsigned short reason, gfp_t gfp); | |
16 | void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type, | |
17 | unsigned short reason); | |
18 | void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval); | |
19 | void dn_nsp_send_conninit(struct sock *sk, unsigned char flags); | |
1da177e4 | 20 | |
59ddd965 JP |
21 | void dn_nsp_output(struct sock *sk); |
22 | int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, | |
23 | struct sk_buff_head *q, unsigned short acknum); | |
24 | void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, gfp_t gfp, | |
25 | int oob); | |
26 | unsigned long dn_nsp_persist(struct sock *sk); | |
27 | int dn_nsp_xmit_timeout(struct sock *sk); | |
1da177e4 | 28 | |
59ddd965 JP |
29 | int dn_nsp_rx(struct sk_buff *); |
30 | int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 31 | |
59ddd965 JP |
32 | struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri); |
33 | struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, | |
34 | long timeo, int *err); | |
1da177e4 LT |
35 | |
36 | #define NSP_REASON_OK 0 /* No error */ | |
37 | #define NSP_REASON_NR 1 /* No resources */ | |
38 | #define NSP_REASON_UN 2 /* Unrecognised node name */ | |
39 | #define NSP_REASON_SD 3 /* Node shutting down */ | |
40 | #define NSP_REASON_ID 4 /* Invalid destination end user */ | |
41 | #define NSP_REASON_ER 5 /* End user lacks resources */ | |
42 | #define NSP_REASON_OB 6 /* Object too busy */ | |
43 | #define NSP_REASON_US 7 /* Unspecified error */ | |
44 | #define NSP_REASON_TP 8 /* Third-Party abort */ | |
45 | #define NSP_REASON_EA 9 /* End user has aborted the link */ | |
46 | #define NSP_REASON_IF 10 /* Invalid node name format */ | |
47 | #define NSP_REASON_LS 11 /* Local node shutdown */ | |
48 | #define NSP_REASON_LL 32 /* Node lacks logical-link resources */ | |
49 | #define NSP_REASON_LE 33 /* End user lacks logical-link resources */ | |
50 | #define NSP_REASON_UR 34 /* Unacceptable RQSTRID or PASSWORD field */ | |
51 | #define NSP_REASON_UA 36 /* Unacceptable ACCOUNT field */ | |
52 | #define NSP_REASON_TM 38 /* End user timed out logical link */ | |
53 | #define NSP_REASON_NU 39 /* Node unreachable */ | |
54 | #define NSP_REASON_NL 41 /* No-link message */ | |
55 | #define NSP_REASON_DC 42 /* Disconnect confirm */ | |
56 | #define NSP_REASON_IO 43 /* Image data field overflow */ | |
57 | ||
58 | #define NSP_DISCINIT 0x38 | |
59 | #define NSP_DISCCONF 0x48 | |
60 | ||
61 | /*------------------------- NSP - messages ------------------------------*/ | |
62 | /* Data Messages */ | |
63 | /*---------------*/ | |
64 | ||
65 | /* Data Messages (data segment/interrupt/link service) */ | |
66 | ||
fd2c3ef7 | 67 | struct nsp_data_seg_msg { |
c4ea94ab SW |
68 | __u8 msgflg; |
69 | __le16 dstaddr; | |
70 | __le16 srcaddr; | |
bc10502d | 71 | } __packed; |
1da177e4 | 72 | |
fd2c3ef7 | 73 | struct nsp_data_opt_msg { |
c4ea94ab SW |
74 | __le16 acknum; |
75 | __le16 segnum; | |
76 | __le16 lsflgs; | |
bc10502d | 77 | } __packed; |
1da177e4 | 78 | |
fd2c3ef7 | 79 | struct nsp_data_opt_msg1 { |
c4ea94ab SW |
80 | __le16 acknum; |
81 | __le16 segnum; | |
bc10502d | 82 | } __packed; |
1da177e4 LT |
83 | |
84 | ||
85 | /* Acknowledgment Message (data/other data) */ | |
fd2c3ef7 | 86 | struct nsp_data_ack_msg { |
c4ea94ab SW |
87 | __u8 msgflg; |
88 | __le16 dstaddr; | |
89 | __le16 srcaddr; | |
90 | __le16 acknum; | |
bc10502d | 91 | } __packed; |
1da177e4 LT |
92 | |
93 | /* Connect Acknowledgment Message */ | |
fd2c3ef7 | 94 | struct nsp_conn_ack_msg { |
c4ea94ab SW |
95 | __u8 msgflg; |
96 | __le16 dstaddr; | |
bc10502d | 97 | } __packed; |
1da177e4 LT |
98 | |
99 | ||
100 | /* Connect Initiate/Retransmit Initiate/Connect Confirm */ | |
fd2c3ef7 | 101 | struct nsp_conn_init_msg { |
c4ea94ab | 102 | __u8 msgflg; |
1da177e4 LT |
103 | #define NSP_CI 0x18 /* Connect Initiate */ |
104 | #define NSP_RCI 0x68 /* Retrans. Conn Init */ | |
c4ea94ab SW |
105 | __le16 dstaddr; |
106 | __le16 srcaddr; | |
107 | __u8 services; | |
1da177e4 LT |
108 | #define NSP_FC_NONE 0x00 /* Flow Control None */ |
109 | #define NSP_FC_SRC 0x04 /* Seg Req. Count */ | |
110 | #define NSP_FC_SCMC 0x08 /* Sess. Control Mess */ | |
111 | #define NSP_FC_MASK 0x0c /* FC type mask */ | |
c4ea94ab SW |
112 | __u8 info; |
113 | __le16 segsize; | |
bc10502d | 114 | } __packed; |
1da177e4 LT |
115 | |
116 | /* Disconnect Initiate/Disconnect Confirm */ | |
fd2c3ef7 | 117 | struct nsp_disconn_init_msg { |
c4ea94ab SW |
118 | __u8 msgflg; |
119 | __le16 dstaddr; | |
120 | __le16 srcaddr; | |
121 | __le16 reason; | |
bc10502d | 122 | } __packed; |
1da177e4 LT |
123 | |
124 | ||
125 | ||
fd2c3ef7 | 126 | struct srcobj_fmt { |
c4ea94ab SW |
127 | __u8 format; |
128 | __u8 task; | |
129 | __le16 grpcode; | |
130 | __le16 usrcode; | |
131 | __u8 dlen; | |
bc10502d | 132 | } __packed; |
1da177e4 LT |
133 | |
134 | /* | |
135 | * A collection of functions for manipulating the sequence | |
136 | * numbers used in NSP. Similar in operation to the functions | |
137 | * of the same name in TCP. | |
138 | */ | |
c4ea94ab | 139 | static __inline__ int dn_before(__u16 seq1, __u16 seq2) |
1da177e4 LT |
140 | { |
141 | seq1 &= 0x0fff; | |
142 | seq2 &= 0x0fff; | |
143 | ||
144 | return (int)((seq1 - seq2) & 0x0fff) > 2048; | |
145 | } | |
146 | ||
147 | ||
c4ea94ab | 148 | static __inline__ int dn_after(__u16 seq1, __u16 seq2) |
1da177e4 LT |
149 | { |
150 | seq1 &= 0x0fff; | |
151 | seq2 &= 0x0fff; | |
152 | ||
153 | return (int)((seq2 - seq1) & 0x0fff) > 2048; | |
154 | } | |
155 | ||
c4ea94ab | 156 | static __inline__ int dn_equal(__u16 seq1, __u16 seq2) |
1da177e4 LT |
157 | { |
158 | return ((seq1 ^ seq2) & 0x0fff) == 0; | |
159 | } | |
160 | ||
c4ea94ab | 161 | static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2) |
1da177e4 LT |
162 | { |
163 | return (dn_before(seq1, seq2) || dn_equal(seq1, seq2)); | |
164 | } | |
165 | ||
c4ea94ab | 166 | static __inline__ void seq_add(__u16 *seq, __u16 off) |
1da177e4 LT |
167 | { |
168 | (*seq) += off; | |
169 | (*seq) &= 0x0fff; | |
170 | } | |
171 | ||
c4ea94ab | 172 | static __inline__ int seq_next(__u16 seq1, __u16 seq2) |
1da177e4 LT |
173 | { |
174 | return dn_equal(seq1 + 1, seq2); | |
175 | } | |
176 | ||
177 | /* | |
178 | * Can we delay the ack ? | |
179 | */ | |
c4ea94ab | 180 | static __inline__ int sendack(__u16 seq) |
1da177e4 LT |
181 | { |
182 | return (int)((seq & 0x1000) ? 0 : 1); | |
183 | } | |
184 | ||
185 | /* | |
186 | * Is socket congested ? | |
187 | */ | |
188 | static __inline__ int dn_congested(struct sock *sk) | |
189 | { | |
190 | return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1); | |
191 | } | |
192 | ||
193 | #define DN_MAX_NSP_DATA_HEADER (11) | |
194 | ||
195 | #endif /* _NET_DN_NSP_H */ |