261 lines
6.6 KiB
C
261 lines
6.6 KiB
C
/*
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* Generic HDLC support routines for Linux
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*
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* Copyright (C) 1999-2005 Krzysztof Halasa <khc@pm.waw.pl>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*/
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#ifndef __HDLC_H
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#define __HDLC_H
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#define GENERIC_HDLC_VERSION 4 /* For synchronization with sethdlc utility */
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#define CLOCK_DEFAULT 0 /* Default setting */
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#define CLOCK_EXT 1 /* External TX and RX clock - DTE */
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#define CLOCK_INT 2 /* Internal TX and RX clock - DCE */
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#define CLOCK_TXINT 3 /* Internal TX and external RX clock */
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#define CLOCK_TXFROMRX 4 /* TX clock derived from external RX clock */
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#define ENCODING_DEFAULT 0 /* Default setting */
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#define ENCODING_NRZ 1
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#define ENCODING_NRZI 2
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#define ENCODING_FM_MARK 3
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#define ENCODING_FM_SPACE 4
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#define ENCODING_MANCHESTER 5
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#define PARITY_DEFAULT 0 /* Default setting */
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#define PARITY_NONE 1 /* No parity */
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#define PARITY_CRC16_PR0 2 /* CRC16, initial value 0x0000 */
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#define PARITY_CRC16_PR1 3 /* CRC16, initial value 0xFFFF */
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#define PARITY_CRC16_PR0_CCITT 4 /* CRC16, initial 0x0000, ITU-T version */
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#define PARITY_CRC16_PR1_CCITT 5 /* CRC16, initial 0xFFFF, ITU-T version */
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#define PARITY_CRC32_PR0_CCITT 6 /* CRC32, initial value 0x00000000 */
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#define PARITY_CRC32_PR1_CCITT 7 /* CRC32, initial value 0xFFFFFFFF */
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#define LMI_DEFAULT 0 /* Default setting */
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#define LMI_NONE 1 /* No LMI, all PVCs are static */
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#define LMI_ANSI 2 /* ANSI Annex D */
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#define LMI_CCITT 3 /* ITU-T Annex A */
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#define LMI_CISCO 4 /* The "original" LMI, aka Gang of Four */
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#define HDLC_MAX_MTU 1500 /* Ethernet 1500 bytes */
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#define HDLC_MAX_MRU (HDLC_MAX_MTU + 10 + 14 + 4) /* for ETH+VLAN over FR */
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#ifdef __KERNEL__
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <net/syncppp.h>
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#include <linux/hdlc/ioctl.h>
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typedef struct { /* Used in Cisco and PPP mode */
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u8 address;
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u8 control;
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u16 protocol;
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}__attribute__ ((packed)) hdlc_header;
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typedef struct {
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u32 type; /* code */
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u32 par1;
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u32 par2;
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u16 rel; /* reliability */
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u32 time;
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}__attribute__ ((packed)) cisco_packet;
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#define CISCO_PACKET_LEN 18
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#define CISCO_BIG_PACKET_LEN 20
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typedef struct pvc_device_struct {
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struct net_device *master;
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struct net_device *main;
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struct net_device *ether; /* bridged Ethernet interface */
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struct pvc_device_struct *next; /* Sorted in ascending DLCI order */
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int dlci;
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int open_count;
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struct {
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unsigned int new: 1;
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unsigned int active: 1;
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unsigned int exist: 1;
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unsigned int deleted: 1;
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unsigned int fecn: 1;
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unsigned int becn: 1;
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unsigned int bandwidth; /* Cisco LMI reporting only */
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}state;
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}pvc_device;
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typedef struct hdlc_device_struct {
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/* To be initialized by hardware driver */
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struct net_device_stats stats;
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/* used by HDLC layer to take control over HDLC device from hw driver*/
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int (*attach)(struct net_device *dev,
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unsigned short encoding, unsigned short parity);
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/* hardware driver must handle this instead of dev->hard_start_xmit */
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int (*xmit)(struct sk_buff *skb, struct net_device *dev);
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/* Things below are for HDLC layer internal use only */
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struct {
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int (*open)(struct net_device *dev);
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void (*close)(struct net_device *dev);
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/* if open & DCD */
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void (*start)(struct net_device *dev);
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/* if open & !DCD */
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void (*stop)(struct net_device *dev);
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void (*detach)(struct hdlc_device_struct *hdlc);
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int (*netif_rx)(struct sk_buff *skb);
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unsigned short (*type_trans)(struct sk_buff *skb,
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struct net_device *dev);
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int id; /* IF_PROTO_HDLC/CISCO/FR/etc. */
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}proto;
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int carrier;
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int open;
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spinlock_t state_lock;
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union {
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struct {
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fr_proto settings;
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pvc_device *first_pvc;
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int dce_pvc_count;
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struct timer_list timer;
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unsigned long last_poll;
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int reliable;
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int dce_changed;
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int request;
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int fullrep_sent;
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u32 last_errors; /* last errors bit list */
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u8 n391cnt;
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u8 txseq; /* TX sequence number */
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u8 rxseq; /* RX sequence number */
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}fr;
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struct {
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cisco_proto settings;
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struct timer_list timer;
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unsigned long last_poll;
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int up;
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int request_sent;
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u32 txseq; /* TX sequence number */
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u32 rxseq; /* RX sequence number */
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}cisco;
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struct {
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raw_hdlc_proto settings;
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}raw_hdlc;
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struct {
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struct ppp_device pppdev;
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struct ppp_device *syncppp_ptr;
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int (*old_change_mtu)(struct net_device *dev,
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int new_mtu);
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}ppp;
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}state;
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void *priv;
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}hdlc_device;
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int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr);
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int hdlc_raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr);
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int hdlc_cisco_ioctl(struct net_device *dev, struct ifreq *ifr);
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int hdlc_ppp_ioctl(struct net_device *dev, struct ifreq *ifr);
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int hdlc_fr_ioctl(struct net_device *dev, struct ifreq *ifr);
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int hdlc_x25_ioctl(struct net_device *dev, struct ifreq *ifr);
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/* Exported from hdlc.o */
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/* Called by hardware driver when a user requests HDLC service */
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int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
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/* Must be used by hardware driver on module startup/exit */
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int register_hdlc_device(struct net_device *dev);
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void unregister_hdlc_device(struct net_device *dev);
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struct net_device *alloc_hdlcdev(void *priv);
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static __inline__ hdlc_device* dev_to_hdlc(struct net_device *dev)
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{
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return netdev_priv(dev);
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}
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static __inline__ pvc_device* dev_to_pvc(struct net_device *dev)
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{
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return (pvc_device*)dev->priv;
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}
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static __inline__ void debug_frame(const struct sk_buff *skb)
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{
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int i;
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for (i=0; i < skb->len; i++) {
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if (i == 100) {
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printk("...\n");
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return;
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}
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printk(" %02X", skb->data[i]);
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}
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printk("\n");
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}
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/* Must be called by hardware driver when HDLC device is being opened */
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int hdlc_open(struct net_device *dev);
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/* Must be called by hardware driver when HDLC device is being closed */
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void hdlc_close(struct net_device *dev);
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/* Called by hardware driver when DCD line level changes */
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void hdlc_set_carrier(int on, struct net_device *dev);
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/* May be used by hardware driver to gain control over HDLC device */
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static __inline__ void hdlc_proto_detach(hdlc_device *hdlc)
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{
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if (hdlc->proto.detach)
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hdlc->proto.detach(hdlc);
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hdlc->proto.detach = NULL;
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}
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static __inline__ struct net_device_stats *hdlc_stats(struct net_device *dev)
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{
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return &dev_to_hdlc(dev)->stats;
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}
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static __inline__ unsigned short hdlc_type_trans(struct sk_buff *skb,
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struct net_device *dev)
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{
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hdlc_device *hdlc = dev_to_hdlc(dev);
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skb->mac.raw = skb->data;
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skb->dev = dev;
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if (hdlc->proto.type_trans)
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return hdlc->proto.type_trans(skb, dev);
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else
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return htons(ETH_P_HDLC);
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}
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#endif /* __KERNEL */
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#endif /* __HDLC_H */
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