summaryrefslogtreecommitdiffstats
path: root/include/linux/hdlc.h
blob: 503194e62fe166cec472e5612f6110926f4f1f06 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/*
 * Generic HDLC support routines for Linux
 *
 * Copyright (C) 1999-2003 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 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;
	}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__ unsigned short 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 */
OpenPOWER on IntegriCloud