patch-2.2.16 linux/include/linux/hdlc.h

• Lines: 287
• Date: Wed Jun 7 14:26:44 2000
• Orig file: v2.2.15/linux/include/linux/hdlc.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN v2.2.15/linux/include/linux/hdlc.h linux/include/linux/hdlc.h
@@ -0,0 +1,286 @@
+/*
+ * Generic HDLC support routines for Linux
+ *
+ * Copyright (C) 1999, 2000 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+ * 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
+ * (at your option) any later version.
+ */
+
+#ifndef __HDLC_H
+#define __HDLC_H
+
+/* Ioctls */
+#define HDLCSETMODE	(0x89FC) /* FIXME */
+#define HDLCPVC		(0x89FD)
+#define HDLCSETLINE	(0x89FE) /* Handled by low-level driver */
+#define HDLCRUN		(0x89FF)
+
+/* Modes */
+#define MODE_NONE	0x00000000 /* Not initialized */
+#define MODE_DCE	0x00000080 /* DCE */
+#define MODE_HDLC	0x00000100 /* Raw HDLC frames */
+#define MODE_CISCO	0x00000200
+#define MODE_PPP	0x00000400
+#define MODE_FR		0x00000800 /* Any LMI */
+#define MODE_FR_ANSI	0x00000801
+#define MODE_FR_CCITT	0x00000802
+#define MODE_X25	0x00001000
+#define MODE_MASK	0x0000FF00
+#define MODE_SOFT	0x80000000 /* Driver modes, using hardware HDLC */
+
+/* Setline values */
+#define LINE_EXT_CLOCK	0	/* External clock */
+#define LINE_V35	1
+#define LINE_RS232	2
+#define LINE_X21	3
+#define LINE_LOOPBACK	4	/* On-card loopback */
+#define LINE_NOLOOPBACK	5
+#define LINE_MIN_CLOCK 75	/* This & higher values are real clock rates */
+
+
+#define HDLC_MAX_MTU 1600
+/* Allow max 10 bytes for FR header */
+#define PVC_MAX_MTU (HDLC_MAX_MTU - 10)
+
+#ifdef __KERNEL__
+
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+
+#define MAXLEN_LMISTAT  20	/* max size status enquiry frame */
+
+#define LINK_STATE_RELIABLE 0x01
+#define LINK_STATE_REQUEST  0x02 /* full stat sent (DCE) / req pending (DTE) */
+#define LINK_STATE_CHANGED  0x04 /* change in PVCs state, send full report */
+#define LINK_STATE_FULLREP_SENT 0x08 /* full report sent */
+
+#define PVC_STATE_NEW       0x01
+#define PVC_STATE_ACTIVE    0x02
+#define PVC_STATE_FECN	    0x08 /* FECN condition */
+#define PVC_STATE_BECN      0x10 /* BECN condition */
+
+
+#define FR_UI              0x03
+#define FR_PAD             0x00
+
+#define NLPID_IP           0xCC
+#define NLPID_IPV6         0x8E
+#define NLPID_SNAP         0x80
+#define NLPID_PAD          0x00
+#define NLPID_Q933         0x08
+
+
+#define LMI_DLCI                   0 /* LMI DLCI */
+#define LMI_PROTO               0x08
+#define LMI_CALLREF             0x00 /* Call Reference */
+#define LMI_ANSI_LOCKSHIFT      0x95 /* ANSI lockshift */
+#define LMI_REPTYPE                1 /* report type */
+#define LMI_CCITT_REPTYPE       0x51
+#define LMI_ALIVE                  3 /* keep alive */
+#define LMI_CCITT_ALIVE         0x53
+#define LMI_PVCSTAT                7 /* pvc status */
+#define LMI_CCITT_PVCSTAT       0x57
+#define LMI_FULLREP                0 /* full report  */
+#define LMI_INTEGRITY              1 /* link integrity report */
+#define LMI_SINGLE                 2 /* single pvc report */
+#define LMI_STATUS_ENQUIRY      0x75
+#define LMI_STATUS              0x7D /* reply */
+
+#define LMI_REPT_LEN               1 /* report type element length */
+#define LMI_INTEG_LEN              2 /* link integrity element length */
+
+#define LMI_LENGTH                13 /* standard LMI frame length */
+#define LMI_ANSI_LENGTH           14
+
+
+
+typedef struct {
+	unsigned ea1  : 1;
+	unsigned cr   : 1;
+	unsigned dlcih: 6;
+  
+	unsigned ea2  : 1;
+	unsigned de   : 1;
+	unsigned becn : 1;
+	unsigned fecn : 1;
+	unsigned dlcil: 4;
+}__attribute__ ((packed)) fr_hdr;
+
+
+
+typedef struct {		/* Used in Cisco and PPP mode */
+	u8 address;
+	u8 control;
+	u16 protocol;
+}__attribute__ ((packed)) hdlc_header;
+
+
+
+typedef struct {
+	u32 type;		/* code */
+	u32 par1;
+	u32 par2;
+	u16 rel;		/* reliability */
+	u32 time;
+}__attribute__ ((packed)) cisco_packet;
+
+
+
+typedef struct pvc_device_struct {
+	struct device netdev;	/* PVC net device - must be first */
+	struct net_device_stats stats;
+	struct hdlc_device_struct *master;
+	struct pvc_device_struct *next;
+
+	u8 state;
+	u8 newstate;
+	char name[IFNAMSIZ];
+}pvc_device;
+
+
+
+typedef struct {
+	u32 last_errors;	/* last errors bit list */
+	int last_poll;		/* ! */
+	u8 T391;		/* ! link integrity verification polling timer */
+	u8 T392;		/* ! polling verification timer */
+	u8 N391;		/* full status polling counter */
+	u8 N392;		/* error threshold */
+	u8 N393;		/* monitored events count */
+	u8 N391cnt;
+
+	u8 state;		/* ! */
+	u8 txseq;		/* ! TX sequence number */
+	u8 rxseq;		/* ! RX sequence number */
+}fr_lmi;			/* ! means used in Cisco HDLC as well */
+
+
+typedef struct hdlc_device_struct {
+	/* to be initialized by hardware driver: */
+	struct device dev; /* master net device - must be first */
+	struct net_device_stats stats;
+
+	struct ppp_device pppdev; /* to be removed in 2.3 */
+	struct ppp_device *syncppp_ptr;
+
+	/* set_mode may be NULL if HDLC-only board */
+	int (*set_mode)(struct hdlc_device_struct *hdlc, int mode);
+	int (*open)(struct hdlc_device_struct *hdlc);
+	void (*close)(struct hdlc_device_struct *hdlc);
+	int (*ioctl)(struct hdlc_device_struct *hdlc, struct ifreq *ifr,
+		     int cmd);
+  
+	/* Only in "hardware" FR modes etc. - may be NULL */
+	int (*create_pvc)(pvc_device *pvc);
+	void (*destroy_pvc)(pvc_device *pvc);
+	int (*open_pvc)(pvc_device *pvc);
+	void (*close_pvc)(pvc_device *pvc);
+
+	/* for hdlc.c internal use only */
+	pvc_device *first_pvc;
+	u16 pvc_count;
+	char name[IFNAMSIZ];
+	int mode;
+
+	struct timer_list timer;
+	fr_lmi lmi;
+}hdlc_device;
+
+
+int register_hdlc_device(hdlc_device *device);
+void unregister_hdlc_device(hdlc_device *device);
+void hdlc_netif_rx(hdlc_device *hdlc, struct sk_buff *skb, int dlci);
+
+
+extern __inline__ struct device* hdlc_to_dev(hdlc_device *hdlc)
+{
+	return &hdlc->dev;
+}
+
+
+extern __inline__ hdlc_device* dev_to_hdlc(struct device *dev)
+{
+	return (hdlc_device*)dev;
+}
+
+
+extern __inline__ pvc_device* dev_to_pvc(struct device *dev)
+{
+	return (pvc_device*)dev;
+}
+
+
+extern __inline__ u16 status_to_dlci(hdlc_device *hdlc, u8 *status, u8 *state)
+{
+	*state &= ~(PVC_STATE_ACTIVE | PVC_STATE_NEW);
+	if (status[2] & 0x08)
+		*state |= PVC_STATE_NEW;
+	else if (status[2] & 0x02)
+		*state |= PVC_STATE_ACTIVE;
+
+	return ((status[0] & 0x3F)<<4) | ((status[1] & 0x78)>>3);
+}
+
+
+extern __inline__ void dlci_to_status(hdlc_device *hdlc, u16 dlci, u8 *status,
+				      u8 state)
+{
+	status[0] = (dlci>>4) & 0x3F;
+	status[1] = ((dlci<<3) & 0x78) | 0x80;
+	status[2] = 0x80;
+
+	if (state & PVC_STATE_NEW)
+		status[2] |= 0x08;
+	else if (state & PVC_STATE_ACTIVE)
+		status[2] |= 0x02;
+}
+
+
+
+extern __inline__ u16 netdev_dlci(struct device *dev)
+{
+	return ntohs(*(u16*)dev->dev_addr);
+}
+
+
+
+extern __inline__ u16 q922_to_dlci(u8 *hdr)
+{
+	return ((hdr[0] & 0xFC)<<2) | ((hdr[1] & 0xF0)>>4);
+}
+
+
+
+extern __inline__ void dlci_to_q922(u8 *hdr, u16 dlci)
+{
+	hdr[0] = (dlci>>2) & 0xFC;
+	hdr[1] = ((dlci<<4) & 0xF0) | 0x01;
+}
+
+
+
+extern __inline__ int mode_is(hdlc_device *hdlc, int mask)
+{
+	return (hdlc->mode & mask) == mask;
+}
+
+
+
+extern __inline__ pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
+{
+	pvc_device *pvc=hdlc->first_pvc;
+	
+	while (pvc) {
+		if (netdev_dlci(&pvc->netdev) == dlci)
+			return pvc;
+		pvc=pvc->next;
+	}
+
+	return NULL;
+}
+
+#endif /* __KERNEL */
+#endif /* __HDLC_H */