| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * slip.h Define the SLIP device driver interface and constants. |
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| 4 | * |
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| 5 | * NOTE: THIS FILE WILL BE MOVED TO THE LINUX INCLUDE DIRECTORY |
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| 6 | * AS SOON AS POSSIBLE! |
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| 7 | * |
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| 8 | * Version: @(#)slip.h 1.2.0 03/28/93 |
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| 9 | * |
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| 10 | * Fixes: |
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| 11 | * Alan Cox : Added slip mtu field. |
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| 12 | * Matt Dillon : Printable slip (borrowed from net2e) |
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| 13 | * Alan Cox : Added SL_SLIP_LOTS |
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| 14 | * Dmitry Gorodchanin : A lot of changes in the 'struct slip' |
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| 15 | * Dmitry Gorodchanin : Added CSLIP statistics. |
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| 16 | * Stanislav Voronyi : Make line checking as created by |
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| 17 | * Igor Chechik, RELCOM Corp. |
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| 18 | * Craig Schlenter : Fixed #define bug that caused |
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| 19 | * CSLIP telnets to hang in 1.3.61-6 |
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| 20 | * |
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| 21 | * Author: Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> |
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| 22 | */ |
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| 23 | #ifndef _LINUX_SLIP_H |
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| 24 | #define _LINUX_SLIP_H |
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| 25 | |
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| 26 | |
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| 27 | #if defined(CONFIG_INET) && defined(CONFIG_SLIP_COMPRESSED) |
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| 28 | # define SL_INCLUDE_CSLIP |
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| 29 | #endif |
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| 30 | |
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| 31 | #ifdef SL_INCLUDE_CSLIP |
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| 32 | # define SL_MODE_DEFAULT SL_MODE_ADAPTIVE |
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| 33 | #else |
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| 34 | # define SL_MODE_DEFAULT SL_MODE_SLIP |
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| 35 | #endif |
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| 36 | |
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| 37 | /* SLIP configuration. */ |
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| 38 | #define SL_NRUNIT 256 /* MAX number of SLIP channels; |
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| 39 | This can be overridden with |
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| 40 | insmod -oslip_maxdev=nnn */ |
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| 41 | #define SL_MTU 296 /* 296; I am used to 600- FvK */ |
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| 42 | |
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| 43 | /* some arch define END as assembly function ending, just undef it */ |
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| 44 | #undef END |
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| 45 | /* SLIP protocol characters. */ |
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| 46 | #define END 0300 /* indicates end of frame */ |
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| 47 | #define ESC 0333 /* indicates byte stuffing */ |
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| 48 | #define ESC_END 0334 /* ESC ESC_END means END 'data' */ |
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| 49 | #define ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */ |
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| 50 | |
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| 51 | |
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| 52 | struct slip { |
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| 53 | int magic; |
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| 54 | |
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| 55 | /* Various fields. */ |
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| 56 | struct tty_struct *tty; /* ptr to TTY structure */ |
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| 57 | struct net_device *dev; /* easy for intr handling */ |
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| 58 | spinlock_t lock; |
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| 59 | struct work_struct tx_work; /* Flushes transmit buffer */ |
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| 60 | |
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| 61 | #ifdef SL_INCLUDE_CSLIP |
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| 62 | struct slcompress *slcomp; /* for header compression */ |
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| 63 | unsigned char *cbuff; /* compression buffer */ |
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| 64 | #endif |
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| 65 | |
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| 66 | /* These are pointers to the malloc()ed frame buffers. */ |
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| 67 | unsigned char *rbuff; /* receiver buffer */ |
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| 68 | int rcount; /* received chars counter */ |
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| 69 | unsigned char *xbuff; /* transmitter buffer */ |
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| 70 | unsigned char *xhead; /* pointer to next byte to XMIT */ |
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| 71 | int xleft; /* bytes left in XMIT queue */ |
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| 72 | int mtu; /* Our mtu (to spot changes!) */ |
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| 73 | int buffsize; /* Max buffers sizes */ |
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| 74 | |
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| 75 | #ifdef CONFIG_SLIP_MODE_SLIP6 |
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| 76 | int xdata, xbits; /* 6 bit slip controls */ |
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| 77 | #endif |
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| 78 | |
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| 79 | unsigned long flags; /* Flag values/ mode etc */ |
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| 80 | #define SLF_INUSE 0 /* Channel in use */ |
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| 81 | #define SLF_ESCAPE 1 /* ESC received */ |
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| 82 | #define SLF_ERROR 2 /* Parity, etc. error */ |
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| 83 | #define SLF_KEEPTEST 3 /* Keepalive test flag */ |
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| 84 | #define SLF_OUTWAIT 4 /* is outpacket was flag */ |
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| 85 | |
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| 86 | unsigned char mode; /* SLIP mode */ |
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| 87 | unsigned char leased; |
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| 88 | pid_t pid; |
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| 89 | #define SL_MODE_SLIP 0 |
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| 90 | #define SL_MODE_CSLIP 1 |
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| 91 | #define SL_MODE_SLIP6 2 /* Matt Dillon's printable slip */ |
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| 92 | #define SL_MODE_CSLIP6 (SL_MODE_SLIP6|SL_MODE_CSLIP) |
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| 93 | #define SL_MODE_AX25 4 |
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| 94 | #define SL_MODE_ADAPTIVE 8 |
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| 95 | #ifdef CONFIG_SLIP_SMART |
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| 96 | unsigned char outfill; /* # of sec between outfill packet */ |
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| 97 | unsigned char keepalive; /* keepalive seconds */ |
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| 98 | struct timer_list outfill_timer; |
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| 99 | struct timer_list keepalive_timer; |
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| 100 | #endif |
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| 101 | }; |
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| 102 | |
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| 103 | #define SLIP_MAGIC 0x5302 |
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| 104 | |
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| 105 | #endif /* _LINUX_SLIP.H */ |
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| 106 | |
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