include/linux/hdlc.h

   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
  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 #define LMI_CISCO               4 /* The "original" LMI, aka Gang of Four */
  45
  46 #define HDLC_MAX_MTU 1500       /* Ethernet 1500 bytes */
  47 #define HDLC_MAX_MRU (HDLC_MAX_MTU + 10 + 14 + 4) /* for ETH+VLAN over FR */
  48
  49
  50 #ifdef __KERNEL__
  51
  52 #include <linux/skbuff.h>
  53 #include <linux/netdevice.h>
  54 #include <net/syncppp.h>
  55 #include <linux/hdlc/ioctl.h>
  56
  57
  58 typedef struct {                /* Used in Cisco and PPP mode */
  59         u8 address;
  60         u8 control;
  61         u16 protocol;
  62 }__attribute__ ((packed)) hdlc_header;
  63
  64
  65
  66 typedef struct {
  67         u32 type;               /* code */
  68         u32 par1;
  69         u32 par2;
  70         u16 rel;                /* reliability */
  71         u32 time;
  72 }__attribute__ ((packed)) cisco_packet;
  73 #define CISCO_PACKET_LEN        18
  74 #define CISCO_BIG_PACKET_LEN    20
  75
  76
  77
  78 typedef struct pvc_device_struct {
  79         struct net_device *master;
  80         struct net_device *main;
  81         struct net_device *ether; /* bridged Ethernet interface */
  82         struct pvc_device_struct *next; /* Sorted in ascending DLCI order */
  83         int dlci;
  84         int open_count;
  85
  86         struct {
  87                 unsigned int new: 1;
  88                 unsigned int active: 1;
  89                 unsigned int exist: 1;
  90                 unsigned int deleted: 1;
  91                 unsigned int fecn: 1;
  92                 unsigned int becn: 1;
  93                 unsigned int bandwidth; /* Cisco LMI reporting only */
  94         }state;
  95 }pvc_device;
  96
  97
  98
  99 typedef struct hdlc_device_struct {
 100         /* To be initialized by hardware driver */
 101         struct net_device_stats stats;
 102
 103         /* used by HDLC layer to take control over HDLC device from hw driver*/
 104         int (*attach)(struct net_device *dev,
 105                       unsigned short encoding, unsigned short parity);
 106
 107         /* hardware driver must handle this instead of dev->hard_start_xmit */
 108         int (*xmit)(struct sk_buff *skb, struct net_device *dev);
 109
 110
 111         /* Things below are for HDLC layer internal use only */
 112         struct {
 113                 int (*open)(struct net_device *dev);
 114                 void (*close)(struct net_device *dev);
 115
 116                 /* if open & DCD */
 117                 void (*start)(struct net_device *dev);
 118                 /* if open & !DCD */
 119                 void (*stop)(struct net_device *dev);
 120
 121                 void (*detach)(struct hdlc_device_struct *hdlc);
 122                 int (*netif_rx)(struct sk_buff *skb);
 123                 unsigned short (*type_trans)(struct sk_buff *skb,
 124                                              struct net_device *dev);
 125                 int id;         /* IF_PROTO_HDLC/CISCO/FR/etc. */
 126         }proto;
 127
 128         int carrier;
 129         int open;
 130         spinlock_t state_lock;
 131
 132         union {
 133                 struct {
 134                         fr_proto settings;
 135                         pvc_device *first_pvc;
 136                         int dce_pvc_count;
 137
 138                         struct timer_list timer;
 139                         unsigned long last_poll;
 140                         int reliable;
 141                         int dce_changed;
 142                         int request;
 143                         int fullrep_sent;
 144                         u32 last_errors; /* last errors bit list */
 145                         u8 n391cnt;
 146                         u8 txseq; /* TX sequence number */
 147                         u8 rxseq; /* RX sequence number */
 148                 }fr;
 149
 150                 struct {
 151                         cisco_proto settings;
 152
 153                         struct timer_list timer;
 154                         unsigned long last_poll;
 155                         int up;
 156                         int request_sent;
 157                         u32 txseq; /* TX sequence number */
 158                         u32 rxseq; /* RX sequence number */
 159                 }cisco;
 160
 161                 struct {
 162                         raw_hdlc_proto settings;
 163                 }raw_hdlc;
 164
 165                 struct {
 166                         struct ppp_device pppdev;
 167                         struct ppp_device *syncppp_ptr;
 168                         int (*old_change_mtu)(struct net_device *dev,
 169                                               int new_mtu);
 170                 }ppp;
 171         }state;
 172         void *priv;
 173 }hdlc_device;
 174
 175
 176
 177 int hdlc_raw_ioctl(struct net_device *dev, struct ifreq *ifr);
 178 int hdlc_raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr);
 179 int hdlc_cisco_ioctl(struct net_device *dev, struct ifreq *ifr);
 180 int hdlc_ppp_ioctl(struct net_device *dev, struct ifreq *ifr);
 181 int hdlc_fr_ioctl(struct net_device *dev, struct ifreq *ifr);
 182 int hdlc_x25_ioctl(struct net_device *dev, struct ifreq *ifr);
 183
 184
 185 /* Exported from hdlc.o */
 186
 187 /* Called by hardware driver when a user requests HDLC service */
 188 int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
 189
 190 /* Must be used by hardware driver on module startup/exit */
 191 #define register_hdlc_device(dev)       register_netdev(dev)
 192 void unregister_hdlc_device(struct net_device *dev);
 193
 194 struct net_device *alloc_hdlcdev(void *priv);
 195
 196 static __inline__ hdlc_device* dev_to_hdlc(struct net_device *dev)
 197 {
 198         return netdev_priv(dev);
 199 }
 200
 201
 202 static __inline__ pvc_device* dev_to_pvc(struct net_device *dev)
 203 {
 204         return (pvc_device*)dev->priv;
 205 }
 206
 207
 208 static __inline__ void debug_frame(const struct sk_buff *skb)
 209 {
 210         int i;
 211
 212         for (i=0; i < skb->len; i++) {
 213                 if (i == 100) {
 214                         printk("...\n");
 215                         return;
 216                 }
 217                 printk(" %02X", skb->data[i]);
 218         }
 219         printk("\n");
 220 }
 221
 222
 223 /* Must be called by hardware driver when HDLC device is being opened */
 224 int hdlc_open(struct net_device *dev);
 225 /* Must be called by hardware driver when HDLC device is being closed */
 226 void hdlc_close(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__ __be16 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 */