2 * Generic HDLC support routines for Linux
4 * Copyright (C) 1999-2005 Krzysztof Halasa <khc@pm.waw.pl>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License
8 * as published by the Free Software Foundation.
15 #define HDLC_MAX_MTU 1500 /* Ethernet 1500 bytes */
17 #define HDLC_MAX_MRU (HDLC_MAX_MTU + 10 + 14 + 4) /* for ETH+VLAN over FR */
19 #define HDLC_MAX_MRU 1600 /* as required for FR network */
25 #include <linux/skbuff.h>
26 #include <linux/netdevice.h>
27 #include <linux/hdlc/ioctl.h>
29 /* This structure is a private property of HDLC protocols.
30 Hardware drivers have no interest here */
33 int (*open
)(struct net_device
*dev
);
34 void (*close
)(struct net_device
*dev
);
35 void (*start
)(struct net_device
*dev
); /* if open & DCD */
36 void (*stop
)(struct net_device
*dev
); /* if open & !DCD */
37 void (*detach
)(struct net_device
*dev
);
38 int (*ioctl
)(struct net_device
*dev
, struct ifreq
*ifr
);
39 __be16 (*type_trans
)(struct sk_buff
*skb
, struct net_device
*dev
);
40 int (*netif_rx
)(struct sk_buff
*skb
);
41 struct module
*module
;
42 struct hdlc_proto
*next
; /* next protocol in the list */
46 /* Pointed to by netdev_priv(dev) */
47 typedef struct hdlc_device
{
48 /* used by HDLC layer to take control over HDLC device from hw driver*/
49 int (*attach
)(struct net_device
*dev
,
50 unsigned short encoding
, unsigned short parity
);
52 /* hardware driver must handle this instead of dev->hard_start_xmit */
53 int (*xmit
)(struct sk_buff
*skb
, struct net_device
*dev
);
55 /* Things below are for HDLC layer internal use only */
56 const struct hdlc_proto
*proto
;
59 spinlock_t state_lock
;
66 /* Exported from hdlc module */
68 /* Called by hardware driver when a user requests HDLC service */
69 int hdlc_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
);
71 /* Must be used by hardware driver on module startup/exit */
72 #define register_hdlc_device(dev) register_netdev(dev)
73 void unregister_hdlc_device(struct net_device
*dev
);
76 void register_hdlc_protocol(struct hdlc_proto
*proto
);
77 void unregister_hdlc_protocol(struct hdlc_proto
*proto
);
79 struct net_device
*alloc_hdlcdev(void *priv
);
81 static inline struct hdlc_device
* dev_to_hdlc(struct net_device
*dev
)
83 return netdev_priv(dev
);
86 static __inline__
void debug_frame(const struct sk_buff
*skb
)
90 for (i
=0; i
< skb
->len
; i
++) {
95 printk(" %02X", skb
->data
[i
]);
101 /* Must be called by hardware driver when HDLC device is being opened */
102 int hdlc_open(struct net_device
*dev
);
103 /* Must be called by hardware driver when HDLC device is being closed */
104 void hdlc_close(struct net_device
*dev
);
106 int attach_hdlc_protocol(struct net_device
*dev
, struct hdlc_proto
*proto
,
108 /* May be used by hardware driver to gain control over HDLC device */
109 void detach_hdlc_protocol(struct net_device
*dev
);
111 static __inline__ __be16
hdlc_type_trans(struct sk_buff
*skb
,
112 struct net_device
*dev
)
114 hdlc_device
*hdlc
= dev_to_hdlc(dev
);
117 skb_reset_mac_header(skb
);
119 if (hdlc
->proto
->type_trans
)
120 return hdlc
->proto
->type_trans(skb
, dev
);
122 return htons(ETH_P_HDLC
);
125 #endif /* __KERNEL */
126 #endif /* __HDLC_H */
This page took 0.031608 seconds and 5 git commands to generate.