| /* |
| * Generic HDLC support routines for Linux |
| * |
| * Copyright (C) 1999-2005 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 LMI_CISCO 4 /* The "original" LMI, aka Gang of Four */ |
| |
| #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; |
| unsigned int bandwidth; /* Cisco LMI reporting only */ |
| }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__ __be16 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 */ |
