Go to most recent revision |
Blame |
Compare with Previous |
Last modification |
View Log
| RSS feed
/*
* Generic HDLC support routines for Linux
*
* Copyright (C) 1999-2003 Krzysztof Halasa <khc@pm.waw.pl>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License
* as published by the Free Software Foundation.
*/
#ifndef __HDLC_H
#define __HDLC_H
#define GENERIC_HDLC_VERSION 4 /* For synchronization with sethdlc utility */
#define CLOCK_DEFAULT 0 /* Default setting */
#define CLOCK_EXT 1 /* External TX and RX clock - DTE */
#define CLOCK_INT 2 /* Internal TX and RX clock - DCE */
#define CLOCK_TXINT 3 /* Internal TX and external RX clock */
#define CLOCK_TXFROMRX 4 /* TX clock derived from external RX clock */
#define ENCODING_DEFAULT 0 /* Default setting */
#define ENCODING_NRZ 1
#define ENCODING_NRZI 2
#define ENCODING_FM_MARK 3
#define ENCODING_FM_SPACE 4
#define ENCODING_MANCHESTER 5
#define PARITY_DEFAULT 0 /* Default setting */
#define PARITY_NONE 1 /* No parity */
#define PARITY_CRC16_PR0 2 /* CRC16, initial value 0x0000 */
#define PARITY_CRC16_PR1 3 /* CRC16, initial value 0xFFFF */
#define PARITY_CRC16_PR0_CCITT 4 /* CRC16, initial 0x0000, ITU-T version */
#define PARITY_CRC16_PR1_CCITT 5 /* CRC16, initial 0xFFFF, ITU-T version */
#define PARITY_CRC32_PR0_CCITT 6 /* CRC32, initial value 0x00000000 */
#define PARITY_CRC32_PR1_CCITT 7 /* CRC32, initial value 0xFFFFFFFF */
#define LMI_DEFAULT 0 /* Default setting */
#define LMI_NONE 1 /* No LMI, all PVCs are static */
#define LMI_ANSI 2 /* ANSI Annex D */
#define LMI_CCITT 3 /* ITU-T Annex A */
#define HDLC_MAX_MTU 1500 /* Ethernet 1500 bytes */
#define HDLC_MAX_MRU (HDLC_MAX_MTU + 10 + 14 + 4) /* for ETH+VLAN over FR */
#ifdef __KERNEL__
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <net/syncppp.h>
#include <linux/hdlc/ioctl.h>
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;
#define CISCO_PACKET_LEN 18
#define CISCO_BIG_PACKET_LEN 20
typedef struct pvc_device_struct {
struct hdlc_device_struct *master;
struct net_device *main;
struct net_device *ether; /* bridged Ethernet interface */
struct pvc_device_struct *next; /* Sorted in ascending DLCI order */
int dlci;
int open_count;
struct {
unsigned int new: 1;
unsigned int active: 1;
unsigned int exist: 1;
unsigned int deleted: 1;
unsigned int fecn: 1;
unsigned int becn: 1;
}state;
}pvc_device;
typedef struct hdlc_device_struct {
/* To be initialized by hardware driver */
struct net_device netdev; /* master net device - must be first */
struct net_device_stats stats;
/* used by HDLC layer to take control over HDLC device from hw driver*/
int (*attach)(struct hdlc_device_struct *hdlc,
unsigned short encoding, unsigned short parity);
/* hardware driver must handle this instead of dev->hard_start_xmit */
int (*xmit)(struct sk_buff *skb, struct net_device *dev);
/* Things below are for HDLC layer internal use only */
struct {
int (*open)(struct hdlc_device_struct *hdlc);
void (*close)(struct hdlc_device_struct *hdlc);
/* if open & DCD */
void (*start)(struct hdlc_device_struct *hdlc);
/* if open & !DCD */
void (*stop)(struct hdlc_device_struct *hdlc);
void (*detach)(struct hdlc_device_struct *hdlc);
int (*netif_rx)(struct sk_buff *skb);
unsigned short (*type_trans)(struct sk_buff *skb,
struct net_device *dev);
int id; /* IF_PROTO_HDLC/CISCO/FR/etc. */
}proto;
int carrier;
int open;
spinlock_t state_lock;
union {
struct {
fr_proto settings;
pvc_device *first_pvc;
int dce_pvc_count;
struct timer_list timer;
int last_poll;
int reliable;
int dce_changed;
int request;
int fullrep_sent;
u32 last_errors; /* last errors bit list */
u8 n391cnt;
u8 txseq; /* TX sequence number */
u8 rxseq; /* RX sequence number */
}fr;
struct {
cisco_proto settings;
struct timer_list timer;
int last_poll;
int up;
u32 txseq; /* TX sequence number */
u32 rxseq; /* RX sequence number */
}cisco;
struct {
raw_hdlc_proto settings;
}raw_hdlc;
struct {
struct ppp_device pppdev;
struct ppp_device *syncppp_ptr;
int (*old_change_mtu)(struct net_device *dev,
int new_mtu);
}ppp;
}state;
}hdlc_device;
int hdlc_raw_ioctl(hdlc_device *hdlc, struct ifreq *ifr);
int hdlc_raw_eth_ioctl(hdlc_device *hdlc, struct ifreq *ifr);
int hdlc_cisco_ioctl(hdlc_device *hdlc, struct ifreq *ifr);
int hdlc_ppp_ioctl(hdlc_device *hdlc, struct ifreq *ifr);
int hdlc_fr_ioctl(hdlc_device *hdlc, struct ifreq *ifr);
int hdlc_x25_ioctl(hdlc_device *hdlc, struct ifreq *ifr);
/* Exported from hdlc.o */
/* Called by hardware driver when a user requests HDLC service */
int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
/* Must be used by hardware driver on module startup/exit */
int register_hdlc_device(hdlc_device *hdlc);
void unregister_hdlc_device(hdlc_device *hdlc);
static __inline__ struct net_device* hdlc_to_dev(hdlc_device *hdlc)
{
return &hdlc->netdev;
}
static __inline__ hdlc_device* dev_to_hdlc(struct net_device *dev)
{
return (hdlc_device*)dev;
}
static __inline__ pvc_device* dev_to_pvc(struct net_device *dev)
{
return (pvc_device*)dev->priv;
}
static __inline__ const char *hdlc_to_name(hdlc_device *hdlc)
{
return hdlc_to_dev(hdlc)->name;
}
static __inline__ void debug_frame(const struct sk_buff *skb)
{
int i;
for (i=0; i < skb->len; i++) {
if (i == 100) {
printk("...\n");
return;
}
printk(" %02X", skb->data[i]);
}
printk("\n");
}
/* Must be called by hardware driver when HDLC device is being opened */
int hdlc_open(hdlc_device *hdlc);
/* Must be called by hardware driver when HDLC device is being closed */
void hdlc_close(hdlc_device *hdlc);
/* Called by hardware driver when DCD line level changes */
void hdlc_set_carrier(int on, hdlc_device *hdlc);
/* May be used by hardware driver to gain control over HDLC device */
static __inline__ void hdlc_proto_detach(hdlc_device *hdlc)
{
if (hdlc->proto.detach)
hdlc->proto.detach(hdlc);
hdlc->proto.detach = NULL;
}
static __inline__ unsigned short hdlc_type_trans(struct sk_buff *skb,
struct net_device *dev)
{
hdlc_device *hdlc = dev_to_hdlc(skb->dev);
if (hdlc->proto.type_trans)
return hdlc->proto.type_trans(skb, dev);
else
return __constant_htons(ETH_P_HDLC);
}
#endif /* __KERNEL */
#endif /* __HDLC_H */