diff options
Diffstat (limited to 'include/linux/hdlc.h')
| -rw-r--r-- | include/linux/hdlc.h | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/include/linux/hdlc.h b/include/linux/hdlc.h new file mode 100644 index 000000000000..503194e62fe1 --- /dev/null +++ b/include/linux/hdlc.h @@ -0,0 +1,258 @@ +/* + * 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 net_device *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_stats stats; + + /* used by HDLC layer to take control over HDLC device from hw driver*/ + int (*attach)(struct net_device *dev, + 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 net_device *dev); + void (*close)(struct net_device *dev); + + /* if open & DCD */ + void (*start)(struct net_device *dev); + /* if open & !DCD */ + void (*stop)(struct net_device *dev); + + 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; + unsigned long 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; + unsigned long last_poll; + int up; + int request_sent; + 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; + void *priv; +}hdlc_device; + + + +int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr); +int hdlc_raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr); +int hdlc_cisco_ioctl(struct net_device *dev, struct ifreq *ifr); +int hdlc_ppp_ioctl(struct net_device *dev, struct ifreq *ifr); +int hdlc_fr_ioctl(struct net_device *dev, struct ifreq *ifr); +int hdlc_x25_ioctl(struct net_device *dev, 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(struct net_device *dev); +void unregister_hdlc_device(struct net_device *dev); + +struct net_device *alloc_hdlcdev(void *priv); + +static __inline__ hdlc_device* dev_to_hdlc(struct net_device *dev) +{ + return netdev_priv(dev); +} + + +static __inline__ pvc_device* dev_to_pvc(struct net_device *dev) +{ + return (pvc_device*)dev->priv; +} + + +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(struct net_device *dev); +/* Must be called by hardware driver when HDLC device is being closed */ +void hdlc_close(struct net_device *dev); +/* Called by hardware driver when DCD line level changes */ +void hdlc_set_carrier(int on, struct net_device *dev); + +/* 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__ struct net_device_stats *hdlc_stats(struct net_device *dev) +{ + return &dev_to_hdlc(dev)->stats; +} + + +static __inline__ unsigned short hdlc_type_trans(struct sk_buff *skb, + struct net_device *dev) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); + + skb->mac.raw = skb->data; + skb->dev = dev; + + if (hdlc->proto.type_trans) + return hdlc->proto.type_trans(skb, dev); + else + return htons(ETH_P_HDLC); +} + +#endif /* __KERNEL */ +#endif /* __HDLC_H */ |