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-rw-r--r--include/linux/hdlc.h258
1 files changed, 258 insertions, 0 deletions
diff --git a/include/linux/hdlc.h b/include/linux/hdlc.h
new file mode 100644
index 000000000000..503194e62fe1
--- /dev/null
+++ b/include/linux/hdlc.h
@@ -0,0 +1,258 @@
1/*
2 * Generic HDLC support routines for Linux
3 *
4 * Copyright (C) 1999-2003 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
11#ifndef __HDLC_H
12#define __HDLC_H
13
14#define GENERIC_HDLC_VERSION 4 /* For synchronization with sethdlc utility */
15
16#define CLOCK_DEFAULT 0 /* Default setting */
17#define CLOCK_EXT 1 /* External TX and RX clock - DTE */
18#define CLOCK_INT 2 /* Internal TX and RX clock - DCE */
19#define CLOCK_TXINT 3 /* Internal TX and external RX clock */
20#define CLOCK_TXFROMRX 4 /* TX clock derived from external RX clock */
21
22
23#define ENCODING_DEFAULT 0 /* Default setting */
24#define ENCODING_NRZ 1
25#define ENCODING_NRZI 2
26#define ENCODING_FM_MARK 3
27#define ENCODING_FM_SPACE 4
28#define ENCODING_MANCHESTER 5
29
30
31#define PARITY_DEFAULT 0 /* Default setting */
32#define PARITY_NONE 1 /* No parity */
33#define PARITY_CRC16_PR0 2 /* CRC16, initial value 0x0000 */
34#define PARITY_CRC16_PR1 3 /* CRC16, initial value 0xFFFF */
35#define PARITY_CRC16_PR0_CCITT 4 /* CRC16, initial 0x0000, ITU-T version */
36#define PARITY_CRC16_PR1_CCITT 5 /* CRC16, initial 0xFFFF, ITU-T version */
37#define PARITY_CRC32_PR0_CCITT 6 /* CRC32, initial value 0x00000000 */
38#define PARITY_CRC32_PR1_CCITT 7 /* CRC32, initial value 0xFFFFFFFF */
39
40#define LMI_DEFAULT 0 /* Default setting */
41#define LMI_NONE 1 /* No LMI, all PVCs are static */
42#define LMI_ANSI 2 /* ANSI Annex D */
43#define LMI_CCITT 3 /* ITU-T Annex A */
44
45#define HDLC_MAX_MTU 1500 /* Ethernet 1500 bytes */
46#define HDLC_MAX_MRU (HDLC_MAX_MTU + 10 + 14 + 4) /* for ETH+VLAN over FR */
47
48
49#ifdef __KERNEL__
50
51#include <linux/skbuff.h>
52#include <linux/netdevice.h>
53#include <net/syncppp.h>
54#include <linux/hdlc/ioctl.h>
55
56
57typedef struct { /* Used in Cisco and PPP mode */
58 u8 address;
59 u8 control;
60 u16 protocol;
61}__attribute__ ((packed)) hdlc_header;
62
63
64
65typedef struct {
66 u32 type; /* code */
67 u32 par1;
68 u32 par2;
69 u16 rel; /* reliability */
70 u32 time;
71}__attribute__ ((packed)) cisco_packet;
72#define CISCO_PACKET_LEN 18
73#define CISCO_BIG_PACKET_LEN 20
74
75
76
77typedef struct pvc_device_struct {
78 struct net_device *master;
79 struct net_device *main;
80 struct net_device *ether; /* bridged Ethernet interface */
81 struct pvc_device_struct *next; /* Sorted in ascending DLCI order */
82 int dlci;
83 int open_count;
84
85 struct {
86 unsigned int new: 1;
87 unsigned int active: 1;
88 unsigned int exist: 1;
89 unsigned int deleted: 1;
90 unsigned int fecn: 1;
91 unsigned int becn: 1;
92 }state;
93}pvc_device;
94
95
96
97typedef struct hdlc_device_struct {
98 /* To be initialized by hardware driver */
99 struct net_device_stats stats;
100
101 /* used by HDLC layer to take control over HDLC device from hw driver*/
102 int (*attach)(struct net_device *dev,
103 unsigned short encoding, unsigned short parity);
104
105 /* hardware driver must handle this instead of dev->hard_start_xmit */
106 int (*xmit)(struct sk_buff *skb, struct net_device *dev);
107
108
109 /* Things below are for HDLC layer internal use only */
110 struct {
111 int (*open)(struct net_device *dev);
112 void (*close)(struct net_device *dev);
113
114 /* if open & DCD */
115 void (*start)(struct net_device *dev);
116 /* if open & !DCD */
117 void (*stop)(struct net_device *dev);
118
119 void (*detach)(struct hdlc_device_struct *hdlc);
120 int (*netif_rx)(struct sk_buff *skb);
121 unsigned short (*type_trans)(struct sk_buff *skb,
122 struct net_device *dev);
123 int id; /* IF_PROTO_HDLC/CISCO/FR/etc. */
124 }proto;
125
126 int carrier;
127 int open;
128 spinlock_t state_lock;
129
130 union {
131 struct {
132 fr_proto settings;
133 pvc_device *first_pvc;
134 int dce_pvc_count;
135
136 struct timer_list timer;
137 unsigned long last_poll;
138 int reliable;
139 int dce_changed;
140 int request;
141 int fullrep_sent;
142 u32 last_errors; /* last errors bit list */
143 u8 n391cnt;
144 u8 txseq; /* TX sequence number */
145 u8 rxseq; /* RX sequence number */
146 }fr;
147
148 struct {
149 cisco_proto settings;
150
151 struct timer_list timer;
152 unsigned long last_poll;
153 int up;
154 int request_sent;
155 u32 txseq; /* TX sequence number */
156 u32 rxseq; /* RX sequence number */
157 }cisco;
158
159 struct {
160 raw_hdlc_proto settings;
161 }raw_hdlc;
162
163 struct {
164 struct ppp_device pppdev;
165 struct ppp_device *syncppp_ptr;
166 int (*old_change_mtu)(struct net_device *dev,
167 int new_mtu);
168 }ppp;
169 }state;
170 void *priv;
171}hdlc_device;
172
173
174
175int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr);
176int hdlc_raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr);
177int hdlc_cisco_ioctl(struct net_device *dev, struct ifreq *ifr);
178int hdlc_ppp_ioctl(struct net_device *dev, struct ifreq *ifr);
179int hdlc_fr_ioctl(struct net_device *dev, struct ifreq *ifr);
180int hdlc_x25_ioctl(struct net_device *dev, struct ifreq *ifr);
181
182
183/* Exported from hdlc.o */
184
185/* Called by hardware driver when a user requests HDLC service */
186int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
187
188/* Must be used by hardware driver on module startup/exit */
189int register_hdlc_device(struct net_device *dev);
190void unregister_hdlc_device(struct net_device *dev);
191
192struct net_device *alloc_hdlcdev(void *priv);
193
194static __inline__ hdlc_device* dev_to_hdlc(struct net_device *dev)
195{
196 return netdev_priv(dev);
197}
198
199
200static __inline__ pvc_device* dev_to_pvc(struct net_device *dev)
201{
202 return (pvc_device*)dev->priv;
203}
204
205
206static __inline__ void debug_frame(const struct sk_buff *skb)
207{
208 int i;
209
210 for (i=0; i < skb->len; i++) {
211 if (i == 100) {
212 printk("...\n");
213 return;
214 }
215 printk(" %02X", skb->data[i]);
216 }
217 printk("\n");
218}
219
220
221/* Must be called by hardware driver when HDLC device is being opened */
222int hdlc_open(struct net_device *dev);
223/* Must be called by hardware driver when HDLC device is being closed */
224void hdlc_close(struct net_device *dev);
225/* Called by hardware driver when DCD line level changes */
226void hdlc_set_carrier(int on, struct net_device *dev);
227
228/* May be used by hardware driver to gain control over HDLC device */
229static __inline__ void hdlc_proto_detach(hdlc_device *hdlc)
230{
231 if (hdlc->proto.detach)
232 hdlc->proto.detach(hdlc);
233 hdlc->proto.detach = NULL;
234}
235
236
237static __inline__ struct net_device_stats *hdlc_stats(struct net_device *dev)
238{
239 return &dev_to_hdlc(dev)->stats;
240}
241
242
243static __inline__ unsigned short hdlc_type_trans(struct sk_buff *skb,
244 struct net_device *dev)
245{
246 hdlc_device *hdlc = dev_to_hdlc(dev);
247
248 skb->mac.raw = skb->data;
249 skb->dev = dev;
250
251 if (hdlc->proto.type_trans)
252 return hdlc->proto.type_trans(skb, dev);
253 else
254 return htons(ETH_P_HDLC);
255}
256
257#endif /* __KERNEL */
258#endif /* __HDLC_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-08 04:48:35 -0500