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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/net/dn_nsp.h
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
4 /******************************************************************************
5 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
7 *******************************************************************************/
8 /* dn_nsp.c functions prototyping */
10 void dn_nsp_send_data_ack(struct sock
*sk
);
11 void dn_nsp_send_oth_ack(struct sock
*sk
);
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
);
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
,
26 unsigned long dn_nsp_persist(struct sock
*sk
);
27 int dn_nsp_xmit_timeout(struct sock
*sk
);
29 int dn_nsp_rx(struct sk_buff
*);
30 int dn_nsp_backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
);
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
);
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 */
58 #define NSP_DISCINIT 0x38
59 #define NSP_DISCCONF 0x48
61 /*------------------------- NSP - messages ------------------------------*/
65 /* Data Messages (data segment/interrupt/link service) */
67 struct nsp_data_seg_msg
{
73 struct nsp_data_opt_msg
{
79 struct nsp_data_opt_msg1
{
85 /* Acknowledgment Message (data/other data) */
86 struct nsp_data_ack_msg
{
93 /* Connect Acknowledgment Message */
94 struct nsp_conn_ack_msg
{
100 /* Connect Initiate/Retransmit Initiate/Connect Confirm */
101 struct nsp_conn_init_msg
{
103 #define NSP_CI 0x18 /* Connect Initiate */
104 #define NSP_RCI 0x68 /* Retrans. Conn Init */
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 */
116 /* Disconnect Initiate/Disconnect Confirm */
117 struct nsp_disconn_init_msg
{
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.
139 static __inline__
int dn_before(__u16 seq1
, __u16 seq2
)
144 return (int)((seq1
- seq2
) & 0x0fff) > 2048;
148 static __inline__
int dn_after(__u16 seq1
, __u16 seq2
)
153 return (int)((seq2
- seq1
) & 0x0fff) > 2048;
156 static __inline__
int dn_equal(__u16 seq1
, __u16 seq2
)
158 return ((seq1
^ seq2
) & 0x0fff) == 0;
161 static __inline__
int dn_before_or_equal(__u16 seq1
, __u16 seq2
)
163 return (dn_before(seq1
, seq2
) || dn_equal(seq1
, seq2
));
166 static __inline__
void seq_add(__u16
*seq
, __u16 off
)
172 static __inline__
int seq_next(__u16 seq1
, __u16 seq2
)
174 return dn_equal(seq1
+ 1, seq2
);
178 * Can we delay the ack ?
180 static __inline__
int sendack(__u16 seq
)
182 return (int)((seq
& 0x1000) ? 0 : 1);
186 * Is socket congested ?
188 static __inline__
int dn_congested(struct sock
*sk
)
190 return atomic_read(&sk
->sk_rmem_alloc
) > (sk
->sk_rcvbuf
>> 1);
193 #define DN_MAX_NSP_DATA_HEADER (11)
195 #endif /* _NET_DN_NSP_H */