slip.h 3.3 KB

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  1. /*
  2. * slip.h Define the SLIP device driver interface and constants.
  3. *
  4. * NOTE: THIS FILE WILL BE MOVED TO THE LINUX INCLUDE DIRECTORY
  5. * AS SOON AS POSSIBLE!
  6. *
  7. * Version: @(#)slip.h 1.2.0 03/28/93
  8. *
  9. * Fixes:
  10. * Alan Cox : Added slip mtu field.
  11. * Matt Dillon : Printable slip (borrowed from net2e)
  12. * Alan Cox : Added SL_SLIP_LOTS
  13. * Dmitry Gorodchanin : A lot of changes in the 'struct slip'
  14. * Dmitry Gorodchanin : Added CSLIP statistics.
  15. * Stanislav Voronyi : Make line checking as created by
  16. * Igor Chechik, RELCOM Corp.
  17. * Craig Schlenter : Fixed #define bug that caused
  18. * CSLIP telnets to hang in 1.3.61-6
  19. *
  20. * Author: Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  21. */
  22. #ifndef _LINUX_SLIP_H
  23. #define _LINUX_SLIP_H
  24. #if defined(CONFIG_INET) && defined(CONFIG_SLIP_COMPRESSED)
  25. # define SL_INCLUDE_CSLIP
  26. #endif
  27. #ifdef SL_INCLUDE_CSLIP
  28. # define SL_MODE_DEFAULT SL_MODE_ADAPTIVE
  29. #else
  30. # define SL_MODE_DEFAULT SL_MODE_SLIP
  31. #endif
  32. /* SLIP configuration. */
  33. #define SL_NRUNIT 256 /* MAX number of SLIP channels;
  34. This can be overridden with
  35. insmod -oslip_maxdev=nnn */
  36. #define SL_MTU 296 /* 296; I am used to 600- FvK */
  37. /* SLIP protocol characters. */
  38. #define END 0300 /* indicates end of frame */
  39. #define ESC 0333 /* indicates byte stuffing */
  40. #define ESC_END 0334 /* ESC ESC_END means END 'data' */
  41. #define ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */
  42. struct slip {
  43. int magic;
  44. /* Various fields. */
  45. struct tty_struct *tty; /* ptr to TTY structure */
  46. struct net_device *dev; /* easy for intr handling */
  47. spinlock_t lock;
  48. struct work_struct tx_work; /* Flushes transmit buffer */
  49. #ifdef SL_INCLUDE_CSLIP
  50. struct slcompress *slcomp; /* for header compression */
  51. unsigned char *cbuff; /* compression buffer */
  52. #endif
  53. /* These are pointers to the malloc()ed frame buffers. */
  54. unsigned char *rbuff; /* receiver buffer */
  55. int rcount; /* received chars counter */
  56. unsigned char *xbuff; /* transmitter buffer */
  57. unsigned char *xhead; /* pointer to next byte to XMIT */
  58. int xleft; /* bytes left in XMIT queue */
  59. int mtu; /* Our mtu (to spot changes!) */
  60. int buffsize; /* Max buffers sizes */
  61. #ifdef CONFIG_SLIP_MODE_SLIP6
  62. int xdata, xbits; /* 6 bit slip controls */
  63. #endif
  64. unsigned long flags; /* Flag values/ mode etc */
  65. #define SLF_INUSE 0 /* Channel in use */
  66. #define SLF_ESCAPE 1 /* ESC received */
  67. #define SLF_ERROR 2 /* Parity, etc. error */
  68. #define SLF_KEEPTEST 3 /* Keepalive test flag */
  69. #define SLF_OUTWAIT 4 /* is outpacket was flag */
  70. unsigned char mode; /* SLIP mode */
  71. unsigned char leased;
  72. pid_t pid;
  73. #define SL_MODE_SLIP 0
  74. #define SL_MODE_CSLIP 1
  75. #define SL_MODE_SLIP6 2 /* Matt Dillon's printable slip */
  76. #define SL_MODE_CSLIP6 (SL_MODE_SLIP6|SL_MODE_CSLIP)
  77. #define SL_MODE_AX25 4
  78. #define SL_MODE_ADAPTIVE 8
  79. #ifdef CONFIG_SLIP_SMART
  80. unsigned char outfill; /* # of sec between outfill packet */
  81. unsigned char keepalive; /* keepalive seconds */
  82. struct timer_list outfill_timer;
  83. struct timer_list keepalive_timer;
  84. #endif
  85. };
  86. #define SLIP_MAGIC 0x5302
  87. #endif /* _LINUX_SLIP.H */