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 25 #include <linux/config.h> 26 27 #if defined(CONFIG_INET) && defined(CONFIG_SLIP_COMPRESSED) 28 # define SL_INCLUDE_CSLIP 29 #endif 30 31 #ifdef SL_INCLUDE_CSLIP 32 # define SL_MODE_DEFAULT SL_MODE_ADAPTIVE 33 #else 34 # define SL_MODE_DEFAULT SL_MODE_SLIP 35 #endif 36 37 /* SLIP configuration. */ 38 #define SL_NRUNIT 256 /* MAX number of SLIP channels; 39 This can be overridden with 40 insmod -oslip_maxdev=nnn */ 41 #define SL_MTU 296 /* 296; I am used to 600- FvK */ 42 43 /* SLIP protocol characters. */ 44 #define END 0300 /* indicates end of frame */ 45 #define ESC 0333 /* indicates byte stuffing */ 46 #define ESC_END 0334 /* ESC ESC_END means END 'data' */ 47 #define ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */ 48 49 50 struct slip { 51 int magic; 52 53 /* Various fields. */ 54 struct tty_struct *tty; /* ptr to TTY structure */ 55 struct net_device *dev; /* easy for intr handling */ 56 spinlock_t lock; 57 58 #ifdef SL_INCLUDE_CSLIP 59 struct slcompress *slcomp; /* for header compression */ 60 unsigned char *cbuff; /* compression buffer */ 61 #endif 62 63 /* These are pointers to the malloc()ed frame buffers. */ 64 unsigned char *rbuff; /* receiver buffer */ 65 int rcount; /* received chars counter */ 66 unsigned char *xbuff; /* transmitter buffer */ 67 unsigned char *xhead; /* pointer to next byte to XMIT */ 68 int xleft; /* bytes left in XMIT queue */ 69 70 /* SLIP interface statistics. */ 71 unsigned long rx_packets; /* inbound frames counter */ 72 unsigned long tx_packets; /* outbound frames counter */ 73 unsigned long rx_bytes; /* inbound byte counte */ 74 unsigned long tx_bytes; /* outbound byte counter */ 75 unsigned long rx_errors; /* Parity, etc. errors */ 76 unsigned long tx_errors; /* Planned stuff */ 77 unsigned long rx_dropped; /* No memory for skb */ 78 unsigned long tx_dropped; /* When MTU change */ 79 unsigned long rx_over_errors; /* Frame bigger then SLIP buf. */ 80 #ifdef SL_INCLUDE_CSLIP 81 unsigned long tx_compressed; 82 unsigned long rx_compressed; 83 unsigned long tx_misses; 84 #endif 85 /* Detailed SLIP statistics. */ 86 87 int mtu; /* Our mtu (to spot changes!) */ 88 int buffsize; /* Max buffers sizes */ 89 90 #ifdef CONFIG_SLIP_MODE_SLIP6 91 int xdata, xbits; /* 6 bit slip controls */ 92 #endif 93 94 unsigned long flags; /* Flag values/ mode etc */ 95 #define SLF_INUSE 0 /* Channel in use */ 96 #define SLF_ESCAPE 1 /* ESC received */ 97 #define SLF_ERROR 2 /* Parity, etc. error */ 98 #define SLF_KEEPTEST 3 /* Keepalive test flag */ 99 #define SLF_OUTWAIT 4 /* is outpacket was flag */ 100 101 unsigned char mode; /* SLIP mode */ 102 unsigned char leased; 103 kdev_t line; 104 pid_t pid; 105 #define SL_MODE_SLIP 0 106 #define SL_MODE_CSLIP 1 107 #define SL_MODE_SLIP6 2 /* Matt Dillon's printable slip */ 108 #define SL_MODE_CSLIP6 (SL_MODE_SLIP6|SL_MODE_CSLIP) 109 #define SL_MODE_AX25 4 110 #define SL_MODE_ADAPTIVE 8 111 #ifdef CONFIG_SLIP_SMART 112 unsigned char outfill; /* # of sec between outfill packet */ 113 unsigned char keepalive; /* keepalive seconds */ 114 struct timer_list outfill_timer; 115 struct timer_list keepalive_timer; 116 #endif 117 }; 118 119 120 121 #define SLIP_MAGIC 0x5302 122 123 extern int slip_init(struct net_device *dev); 124 125 #endif /* _LINUX_SLIP.H */ 126