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marcus.erl |
/*
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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 HDLC_MAX_MTU 1500 /* Ethernet 1500 bytes */
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#if 0
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#define HDLC_MAX_MRU (HDLC_MAX_MTU + 10 + 14 + 4) /* for ETH+VLAN over FR */
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#else
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#define HDLC_MAX_MRU 1600 /* as required for FR network */
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#endif
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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 <linux/hdlc/ioctl.h>
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/* Used by all network devices here, pointed to by netdev_priv(dev) */
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struct hdlc_device_desc {
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int (*netif_rx)(struct sk_buff *skb);
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struct net_device_stats stats;
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};
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/* This structure is a private property of HDLC protocols.
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Hardware drivers have no interest here */
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struct hdlc_proto {
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int (*open)(struct net_device *dev);
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void (*close)(struct net_device *dev);
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void (*start)(struct net_device *dev); /* if open & DCD */
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void (*stop)(struct net_device *dev); /* if open & !DCD */
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void (*detach)(struct net_device *dev);
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int (*ioctl)(struct net_device *dev, struct ifreq *ifr);
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__be16 (*type_trans)(struct sk_buff *skb, struct net_device *dev);
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struct module *module;
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struct hdlc_proto *next; /* next protocol in the list */
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};
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typedef struct hdlc_device {
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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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const struct hdlc_proto *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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void *state;
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void *priv;
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}hdlc_device;
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/* Exported from hdlc module */
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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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#define register_hdlc_device(dev) register_netdev(dev)
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void unregister_hdlc_device(struct net_device *dev);
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void register_hdlc_protocol(struct hdlc_proto *proto);
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void unregister_hdlc_protocol(struct hdlc_proto *proto);
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struct net_device *alloc_hdlcdev(void *priv);
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static __inline__ struct hdlc_device_desc* dev_to_desc(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__ hdlc_device* dev_to_hdlc(struct net_device *dev)
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{
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return netdev_priv(dev) + sizeof(struct hdlc_device_desc);
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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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int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto,
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int (*rx)(struct sk_buff *skb), size_t size);
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/* May be used by hardware driver to gain control over HDLC device */
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void detach_hdlc_protocol(struct net_device *dev);
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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_desc(dev)->stats;
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}
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static __inline__ __be16 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->dev = dev;
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skb_reset_mac_header(skb);
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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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