--- /dev/null
+#ifndef _NET_DN_NSP_H
+#define _NET_DN_NSP_H
+/******************************************************************************
+ (c) 1995-1998 E.M. Serrat emserrat@geocities.com
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+*******************************************************************************/
+/* dn_nsp.c functions prototyping */
+
+void dn_nsp_send_data_ack(struct sock *sk);
+void dn_nsp_send_oth_ack(struct sock *sk);
+void dn_nsp_delayed_ack(struct sock *sk);
+void dn_send_conn_ack(struct sock *sk);
+void dn_send_conn_conf(struct sock *sk, gfp_t gfp);
+void dn_nsp_send_disc(struct sock *sk, unsigned char type,
+ unsigned short reason, gfp_t gfp);
+void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type,
+ unsigned short reason);
+void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval);
+void dn_nsp_send_conninit(struct sock *sk, unsigned char flags);
+
+void dn_nsp_output(struct sock *sk);
+int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb,
+ struct sk_buff_head *q, unsigned short acknum);
+void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, gfp_t gfp,
+ int oob);
+unsigned long dn_nsp_persist(struct sock *sk);
+int dn_nsp_xmit_timeout(struct sock *sk);
+
+int dn_nsp_rx(struct sk_buff *);
+int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
+
+struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
+struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock,
+ long timeo, int *err);
+
+#define NSP_REASON_OK 0 /* No error */
+#define NSP_REASON_NR 1 /* No resources */
+#define NSP_REASON_UN 2 /* Unrecognised node name */
+#define NSP_REASON_SD 3 /* Node shutting down */
+#define NSP_REASON_ID 4 /* Invalid destination end user */
+#define NSP_REASON_ER 5 /* End user lacks resources */
+#define NSP_REASON_OB 6 /* Object too busy */
+#define NSP_REASON_US 7 /* Unspecified error */
+#define NSP_REASON_TP 8 /* Third-Party abort */
+#define NSP_REASON_EA 9 /* End user has aborted the link */
+#define NSP_REASON_IF 10 /* Invalid node name format */
+#define NSP_REASON_LS 11 /* Local node shutdown */
+#define NSP_REASON_LL 32 /* Node lacks logical-link resources */
+#define NSP_REASON_LE 33 /* End user lacks logical-link resources */
+#define NSP_REASON_UR 34 /* Unacceptable RQSTRID or PASSWORD field */
+#define NSP_REASON_UA 36 /* Unacceptable ACCOUNT field */
+#define NSP_REASON_TM 38 /* End user timed out logical link */
+#define NSP_REASON_NU 39 /* Node unreachable */
+#define NSP_REASON_NL 41 /* No-link message */
+#define NSP_REASON_DC 42 /* Disconnect confirm */
+#define NSP_REASON_IO 43 /* Image data field overflow */
+
+#define NSP_DISCINIT 0x38
+#define NSP_DISCCONF 0x48
+
+/*------------------------- NSP - messages ------------------------------*/
+/* Data Messages */
+/*---------------*/
+
+/* Data Messages (data segment/interrupt/link service) */
+
+struct nsp_data_seg_msg {
+ __u8 msgflg;
+ __le16 dstaddr;
+ __le16 srcaddr;
+} __packed;
+
+struct nsp_data_opt_msg {
+ __le16 acknum;
+ __le16 segnum;
+ __le16 lsflgs;
+} __packed;
+
+struct nsp_data_opt_msg1 {
+ __le16 acknum;
+ __le16 segnum;
+} __packed;
+
+
+/* Acknowledgment Message (data/other data) */
+struct nsp_data_ack_msg {
+ __u8 msgflg;
+ __le16 dstaddr;
+ __le16 srcaddr;
+ __le16 acknum;
+} __packed;
+
+/* Connect Acknowledgment Message */
+struct nsp_conn_ack_msg {
+ __u8 msgflg;
+ __le16 dstaddr;
+} __packed;
+
+
+/* Connect Initiate/Retransmit Initiate/Connect Confirm */
+struct nsp_conn_init_msg {
+ __u8 msgflg;
+#define NSP_CI 0x18 /* Connect Initiate */
+#define NSP_RCI 0x68 /* Retrans. Conn Init */
+ __le16 dstaddr;
+ __le16 srcaddr;
+ __u8 services;
+#define NSP_FC_NONE 0x00 /* Flow Control None */
+#define NSP_FC_SRC 0x04 /* Seg Req. Count */
+#define NSP_FC_SCMC 0x08 /* Sess. Control Mess */
+#define NSP_FC_MASK 0x0c /* FC type mask */
+ __u8 info;
+ __le16 segsize;
+} __packed;
+
+/* Disconnect Initiate/Disconnect Confirm */
+struct nsp_disconn_init_msg {
+ __u8 msgflg;
+ __le16 dstaddr;
+ __le16 srcaddr;
+ __le16 reason;
+} __packed;
+
+
+
+struct srcobj_fmt {
+ __u8 format;
+ __u8 task;
+ __le16 grpcode;
+ __le16 usrcode;
+ __u8 dlen;
+} __packed;
+
+/*
+ * A collection of functions for manipulating the sequence
+ * numbers used in NSP. Similar in operation to the functions
+ * of the same name in TCP.
+ */
+static __inline__ int dn_before(__u16 seq1, __u16 seq2)
+{
+ seq1 &= 0x0fff;
+ seq2 &= 0x0fff;
+
+ return (int)((seq1 - seq2) & 0x0fff) > 2048;
+}
+
+
+static __inline__ int dn_after(__u16 seq1, __u16 seq2)
+{
+ seq1 &= 0x0fff;
+ seq2 &= 0x0fff;
+
+ return (int)((seq2 - seq1) & 0x0fff) > 2048;
+}
+
+static __inline__ int dn_equal(__u16 seq1, __u16 seq2)
+{
+ return ((seq1 ^ seq2) & 0x0fff) == 0;
+}
+
+static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2)
+{
+ return (dn_before(seq1, seq2) || dn_equal(seq1, seq2));
+}
+
+static __inline__ void seq_add(__u16 *seq, __u16 off)
+{
+ (*seq) += off;
+ (*seq) &= 0x0fff;
+}
+
+static __inline__ int seq_next(__u16 seq1, __u16 seq2)
+{
+ return dn_equal(seq1 + 1, seq2);
+}
+
+/*
+ * Can we delay the ack ?
+ */
+static __inline__ int sendack(__u16 seq)
+{
+ return (int)((seq & 0x1000) ? 0 : 1);
+}
+
+/*
+ * Is socket congested ?
+ */
+static __inline__ int dn_congested(struct sock *sk)
+{
+ return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1);
+}
+
+#define DN_MAX_NSP_DATA_HEADER (11)
+
+#endif /* _NET_DN_NSP_H */
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