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1 | /* | |
2 | * Generic HDLC support routines for Linux | |
3 | * | |
4 | * Copyright (C) 1999-2005 Krzysztof Halasa <khc@pm.waw.pl> | |
5 | * | |
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. | |
9 | */ | |
10 | #ifndef __HDLC_H | |
11 | #define __HDLC_H | |
12 | ||
13 | ||
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/hdlc/ioctl.h> | |
17 | #include <uapi/linux/hdlc.h> | |
18 | ||
19 | /* This structure is a private property of HDLC protocols. | |
20 | Hardware drivers have no interest here */ | |
21 | ||
22 | struct hdlc_proto { | |
23 | int (*open)(struct net_device *dev); | |
24 | void (*close)(struct net_device *dev); | |
25 | void (*start)(struct net_device *dev); /* if open & DCD */ | |
26 | void (*stop)(struct net_device *dev); /* if open & !DCD */ | |
27 | void (*detach)(struct net_device *dev); | |
28 | int (*ioctl)(struct net_device *dev, struct ifreq *ifr); | |
29 | __be16 (*type_trans)(struct sk_buff *skb, struct net_device *dev); | |
30 | int (*netif_rx)(struct sk_buff *skb); | |
31 | netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev); | |
32 | struct module *module; | |
33 | struct hdlc_proto *next; /* next protocol in the list */ | |
34 | }; | |
35 | ||
36 | ||
37 | /* Pointed to by netdev_priv(dev) */ | |
38 | typedef struct hdlc_device { | |
39 | /* used by HDLC layer to take control over HDLC device from hw driver*/ | |
40 | int (*attach)(struct net_device *dev, | |
41 | unsigned short encoding, unsigned short parity); | |
42 | ||
43 | /* hardware driver must handle this instead of dev->hard_start_xmit */ | |
44 | netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev); | |
45 | ||
46 | /* Things below are for HDLC layer internal use only */ | |
47 | const struct hdlc_proto *proto; | |
48 | int carrier; | |
49 | int open; | |
50 | spinlock_t state_lock; | |
51 | void *state; | |
52 | void *priv; | |
53 | } hdlc_device; | |
54 | ||
55 | ||
56 | ||
57 | /* Exported from hdlc module */ | |
58 | ||
59 | /* Called by hardware driver when a user requests HDLC service */ | |
60 | int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); | |
61 | ||
62 | /* Must be used by hardware driver on module startup/exit */ | |
63 | #define register_hdlc_device(dev) register_netdev(dev) | |
64 | void unregister_hdlc_device(struct net_device *dev); | |
65 | ||
66 | ||
67 | void register_hdlc_protocol(struct hdlc_proto *proto); | |
68 | void unregister_hdlc_protocol(struct hdlc_proto *proto); | |
69 | ||
70 | struct net_device *alloc_hdlcdev(void *priv); | |
71 | ||
72 | static inline struct hdlc_device* dev_to_hdlc(struct net_device *dev) | |
73 | { | |
74 | return netdev_priv(dev); | |
75 | } | |
76 | ||
77 | static __inline__ void debug_frame(const struct sk_buff *skb) | |
78 | { | |
79 | int i; | |
80 | ||
81 | for (i=0; i < skb->len; i++) { | |
82 | if (i == 100) { | |
83 | printk("...\n"); | |
84 | return; | |
85 | } | |
86 | printk(" %02X", skb->data[i]); | |
87 | } | |
88 | printk("\n"); | |
89 | } | |
90 | ||
91 | ||
92 | /* Must be called by hardware driver when HDLC device is being opened */ | |
93 | int hdlc_open(struct net_device *dev); | |
94 | /* Must be called by hardware driver when HDLC device is being closed */ | |
95 | void hdlc_close(struct net_device *dev); | |
96 | /* Must be pointed to by hw driver's dev->netdev_ops->ndo_start_xmit */ | |
97 | netdev_tx_t hdlc_start_xmit(struct sk_buff *skb, struct net_device *dev); | |
98 | ||
99 | int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto, | |
100 | size_t size); | |
101 | /* May be used by hardware driver to gain control over HDLC device */ | |
102 | int detach_hdlc_protocol(struct net_device *dev); | |
103 | ||
104 | static __inline__ __be16 hdlc_type_trans(struct sk_buff *skb, | |
105 | struct net_device *dev) | |
106 | { | |
107 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
108 | ||
109 | skb->dev = dev; | |
110 | skb_reset_mac_header(skb); | |
111 | ||
112 | if (hdlc->proto->type_trans) | |
113 | return hdlc->proto->type_trans(skb, dev); | |
114 | else | |
115 | return htons(ETH_P_HDLC); | |
116 | } | |
117 | ||
118 | #endif /* __HDLC_H */ |