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1da177e4 LT |
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 | ||
57 | typedef struct { /* Used in Cisco and PPP mode */ | |
58 | u8 address; | |
59 | u8 control; | |
60 | u16 protocol; | |
61 | }__attribute__ ((packed)) hdlc_header; | |
62 | ||
63 | ||
64 | ||
65 | typedef 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 | ||
77 | typedef 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 | ||
97 | typedef 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 | ||
175 | int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr); | |
176 | int hdlc_raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr); | |
177 | int hdlc_cisco_ioctl(struct net_device *dev, struct ifreq *ifr); | |
178 | int hdlc_ppp_ioctl(struct net_device *dev, struct ifreq *ifr); | |
179 | int hdlc_fr_ioctl(struct net_device *dev, struct ifreq *ifr); | |
180 | int 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 */ | |
186 | int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); | |
187 | ||
188 | /* Must be used by hardware driver on module startup/exit */ | |
189 | int register_hdlc_device(struct net_device *dev); | |
190 | void unregister_hdlc_device(struct net_device *dev); | |
191 | ||
192 | struct net_device *alloc_hdlcdev(void *priv); | |
193 | ||
194 | static __inline__ hdlc_device* dev_to_hdlc(struct net_device *dev) | |
195 | { | |
196 | return netdev_priv(dev); | |
197 | } | |
198 | ||
199 | ||
200 | static __inline__ pvc_device* dev_to_pvc(struct net_device *dev) | |
201 | { | |
202 | return (pvc_device*)dev->priv; | |
203 | } | |
204 | ||
205 | ||
206 | static __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 */ | |
222 | int hdlc_open(struct net_device *dev); | |
223 | /* Must be called by hardware driver when HDLC device is being closed */ | |
224 | void hdlc_close(struct net_device *dev); | |
225 | /* Called by hardware driver when DCD line level changes */ | |
226 | void hdlc_set_carrier(int on, struct net_device *dev); | |
227 | ||
228 | /* May be used by hardware driver to gain control over HDLC device */ | |
229 | static __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 | ||
237 | static __inline__ struct net_device_stats *hdlc_stats(struct net_device *dev) | |
238 | { | |
239 | return &dev_to_hdlc(dev)->stats; | |
240 | } | |
241 | ||
242 | ||
243 | static __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 */ |