cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

hdlc.h (3267B)


      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Generic HDLC support routines for Linux
      4 *
      5 * Copyright (C) 1999-2005 Krzysztof Halasa <khc@pm.waw.pl>
      6 */
      7#ifndef __HDLC_H
      8#define __HDLC_H
      9
     10
     11#include <linux/skbuff.h>
     12#include <linux/netdevice.h>
     13#include <linux/hdlc/ioctl.h>
     14#include <uapi/linux/hdlc.h>
     15
     16/* This structure is a private property of HDLC protocols.
     17   Hardware drivers have no interest here */
     18
     19struct hdlc_proto {
     20	int (*open)(struct net_device *dev);
     21	void (*close)(struct net_device *dev);
     22	void (*start)(struct net_device *dev); /* if open & DCD */
     23	void (*stop)(struct net_device *dev); /* if open & !DCD */
     24	void (*detach)(struct net_device *dev);
     25	int (*ioctl)(struct net_device *dev, struct if_settings *ifs);
     26	__be16 (*type_trans)(struct sk_buff *skb, struct net_device *dev);
     27	int (*netif_rx)(struct sk_buff *skb);
     28	netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev);
     29	struct module *module;
     30	struct hdlc_proto *next; /* next protocol in the list */
     31};
     32
     33
     34/* Pointed to by netdev_priv(dev) */
     35typedef struct hdlc_device {
     36	/* used by HDLC layer to take control over HDLC device from hw driver*/
     37	int (*attach)(struct net_device *dev,
     38		      unsigned short encoding, unsigned short parity);
     39
     40	/* hardware driver must handle this instead of dev->hard_start_xmit */
     41	netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev);
     42
     43	/* Things below are for HDLC layer internal use only */
     44	const struct hdlc_proto *proto;
     45	int carrier;
     46	int open;
     47	spinlock_t state_lock;
     48	void *state;
     49	void *priv;
     50} hdlc_device;
     51
     52
     53
     54/* Exported from hdlc module */
     55
     56/* Called by hardware driver when a user requests HDLC service */
     57int hdlc_ioctl(struct net_device *dev, struct if_settings *ifs);
     58
     59/* Must be used by hardware driver on module startup/exit */
     60#define register_hdlc_device(dev)	register_netdev(dev)
     61void unregister_hdlc_device(struct net_device *dev);
     62
     63
     64void register_hdlc_protocol(struct hdlc_proto *proto);
     65void unregister_hdlc_protocol(struct hdlc_proto *proto);
     66
     67struct net_device *alloc_hdlcdev(void *priv);
     68
     69static inline struct hdlc_device* dev_to_hdlc(struct net_device *dev)
     70{
     71	return netdev_priv(dev);
     72}
     73
     74static __inline__ void debug_frame(const struct sk_buff *skb)
     75{
     76	int i;
     77
     78	for (i=0; i < skb->len; i++) {
     79		if (i == 100) {
     80			printk("...\n");
     81			return;
     82		}
     83		printk(" %02X", skb->data[i]);
     84	}
     85	printk("\n");
     86}
     87
     88
     89/* Must be called by hardware driver when HDLC device is being opened */
     90int hdlc_open(struct net_device *dev);
     91/* Must be called by hardware driver when HDLC device is being closed */
     92void hdlc_close(struct net_device *dev);
     93/* Must be pointed to by hw driver's dev->netdev_ops->ndo_start_xmit */
     94netdev_tx_t hdlc_start_xmit(struct sk_buff *skb, struct net_device *dev);
     95
     96int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto,
     97			 size_t size);
     98/* May be used by hardware driver to gain control over HDLC device */
     99int detach_hdlc_protocol(struct net_device *dev);
    100
    101static __inline__ __be16 hdlc_type_trans(struct sk_buff *skb,
    102					 struct net_device *dev)
    103{
    104	hdlc_device *hdlc = dev_to_hdlc(dev);
    105
    106	skb->dev = dev;
    107	skb_reset_mac_header(skb);
    108
    109	if (hdlc->proto->type_trans)
    110		return hdlc->proto->type_trans(skb, dev);
    111	else
    112		return htons(ETH_P_HDLC);
    113}
    114
    115#endif /* __HDLC_H */