patch-2.3.4 linux/include/net/dn_nsp.h

• Lines: 195
• Date: Wed May 26 09:36:35 1999
• Orig file: v2.3.3/linux/include/net/dn_nsp.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.3/linux/include/net/dn_nsp.h linux/include/net/dn_nsp.h
@@ -0,0 +1,194 @@
+#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 */
+
+extern void dn_nsp_send_data_ack(struct sock *sk);
+extern void dn_nsp_send_oth_ack(struct sock *sk);
+extern void dn_nsp_delayed_ack(struct sock *sk);
+extern void dn_send_conn_ack(struct sock *sk);
+extern void dn_send_conn_conf(struct sock *sk);
+extern void dn_send_disc(struct sock *sk, unsigned char type, unsigned short reason);
+extern void dn_nsp_send_lnk(struct sock *sk, unsigned short flags);
+extern void dn_nsp_send_conninit(struct sock *sk, unsigned char flags);
+
+extern void dn_nsp_output(struct sock *sk);
+extern int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum);
+extern void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, int oob);
+extern unsigned long dn_nsp_persist(struct sock *sk);
+extern int dn_nsp_xmit_timeout(struct sock *sk);
+
+extern int dn_nsp_rx(struct sk_buff *);
+extern int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
+
+extern struct sk_buff *dn_alloc_skb(struct sock *sk, int size, int pri);
+extern struct sk_buff *dn_alloc_send_skb(struct sock *sk, int *size, int noblock, int *err);
+
+#define NSP_REASON_NR 1
+#define NSP_REASON_DC 42
+#define NSP_REASON_NL 41
+
+#define NSP_DISCINIT 0x38
+#define NSP_DISCCONF 0x48
+
+/*------------------------- NSP - messages ------------------------------*/
+/* Data Messages */
+/*---------------*/
+
+/* Data Messages    (data segment/interrupt/link service)               */
+
+        struct nsp_data_seg_msg
+        {
+                unsigned char   msgflg          __attribute__((packed));
+                unsigned short  dstaddr         __attribute__((packed));
+                unsigned short  srcaddr         __attribute__((packed));
+        };
+
+        struct nsp_data_opt_msg
+        {
+                unsigned short  acknum          __attribute__((packed));
+                unsigned short  segnum          __attribute__((packed));
+                unsigned short  lsflgs          __attribute__((packed));
+        };
+
+        struct nsp_data_opt_msg1
+        {
+                unsigned short  acknum          __attribute__((packed));
+                unsigned short  segnum          __attribute__((packed));
+        };
+
+/* Acknowledgment Messages */
+/*-------------------------*/
+
+/* Acknowledgment Messages (data/other data)                             */
+
+        struct  nsp_data_ack_msg
+        {
+                unsigned char   msgflg          __attribute__((packed));
+                unsigned short  dstaddr         __attribute__((packed));
+                unsigned short  srcaddr         __attribute__((packed));
+                unsigned short  acknum          __attribute__((packed));
+        };
+
+/* Connect Acknowledgment Message */
+
+        struct  nsp_conn_ack_msg
+        {
+                unsigned char   msgflg          __attribute__((packed));
+                unsigned short  dstaddr         __attribute__((packed));
+        };
+
+/* Control Messages */
+/*------------------*/
+
+/* Connect Initiate/Retransmit Initiate/Connect Confirm */
+
+        struct  nsp_conn_init_msg
+        {
+                unsigned char   msgflg          __attribute__((packed));
+#define         NSP_CI          0x18            /* Connect Initiate     */
+#define         NSP_RCI         0x68            /* Retrans. Conn Init   */
+                unsigned short  dstaddr         __attribute__((packed));
+                unsigned short  srcaddr         __attribute__((packed));
+                unsigned char   services        __attribute__((packed));
+#define         NSP_FC_NONE     0x00            /* Flow Control None    */
+#define         NSP_FC_SRC      0x04            /* Seg Req. Count       */
+#define         NSP_FC_SCMC     0x08            /* Sess. Control Mess   */
+                unsigned char   info            __attribute__((packed));
+                unsigned short  segsize         __attribute__((packed));
+        };
+
+/* Disconnect Initiate/Disconnect Confirm */
+
+        struct  nsp_disconn_init_msg
+        {
+                unsigned char   msgflg          __attribute__((packed));
+                unsigned short  dstaddr         __attribute__((packed));
+                unsigned short  srcaddr         __attribute__((packed));
+                unsigned short  reason          __attribute__((packed));
+        };
+
+
+/*------------------------- SCP - messages ------------------------------*/
+
+        struct  srcobj_fmt
+        {
+                char            format          __attribute__((packed));
+                unsigned char   task            __attribute__((packed));
+                unsigned short  grpcode         __attribute__((packed));
+                unsigned short  usrcode         __attribute__((packed));
+                char            dlen            __attribute__((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 before(unsigned short seq1, unsigned short seq2)
+{
+        seq1 &= 0x0fff;
+        seq2 &= 0x0fff;
+
+        return (int)((seq1 - seq2) & 0x0fff) > 2048;
+}
+
+
+static __inline__ int after(unsigned short seq1, unsigned short seq2)
+{
+        seq1 &= 0x0fff;
+        seq2 &= 0x0fff;
+
+        return (int)((seq2 - seq1) & 0x0fff) > 2048;
+}
+
+static __inline__ int equal(unsigned short seq1, unsigned short seq2)
+{
+        return ((seq1 ^ seq2) & 0x0fff) == 0;
+}
+
+static __inline__ int before_or_equal(unsigned short seq1, unsigned short seq2)
+{
+	return (before(seq1, seq2) || equal(seq1, seq2));
+}
+
+static __inline__ void seq_add(unsigned short *seq, unsigned short off)
+{
+        *seq += off;
+        *seq &= 0x0fff;
+}
+
+static __inline__ int seq_next(unsigned short seq1, unsigned short seq2)
+{
+	return (((seq2&0x0fff) - (seq1&0x0fff)) == 1);
+}
+
+/*
+ * Can we delay the ack ?
+ */
+static __inline__ int sendack(unsigned short seq)
+{
+        return (int)((seq & 0x1000) ? 0 : 1);
+}
+
+/*
+ * Is socket congested ?
+ */
+static __inline__ int dn_congested(struct sock *sk)
+{
+        return atomic_read(&sk->rmem_alloc) > (sk->rcvbuf >> 1);
+}
+
+#endif /* _NET_DN_NSP_H */