1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * slip.h Define the SLIP device driver interface and constants. 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * NOTE: THIS FILE WILL BE MOVED TO THE LINUX INCLUDE DIRECTORY 6*4882a593Smuzhiyun * AS SOON AS POSSIBLE! 7*4882a593Smuzhiyun * 8*4882a593Smuzhiyun * Version: @(#)slip.h 1.2.0 03/28/93 9*4882a593Smuzhiyun * 10*4882a593Smuzhiyun * Fixes: 11*4882a593Smuzhiyun * Alan Cox : Added slip mtu field. 12*4882a593Smuzhiyun * Matt Dillon : Printable slip (borrowed from net2e) 13*4882a593Smuzhiyun * Alan Cox : Added SL_SLIP_LOTS 14*4882a593Smuzhiyun * Dmitry Gorodchanin : A lot of changes in the 'struct slip' 15*4882a593Smuzhiyun * Dmitry Gorodchanin : Added CSLIP statistics. 16*4882a593Smuzhiyun * Stanislav Voronyi : Make line checking as created by 17*4882a593Smuzhiyun * Igor Chechik, RELCOM Corp. 18*4882a593Smuzhiyun * Craig Schlenter : Fixed #define bug that caused 19*4882a593Smuzhiyun * CSLIP telnets to hang in 1.3.61-6 20*4882a593Smuzhiyun * 21*4882a593Smuzhiyun * Author: Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> 22*4882a593Smuzhiyun */ 23*4882a593Smuzhiyun #ifndef _LINUX_SLIP_H 24*4882a593Smuzhiyun #define _LINUX_SLIP_H 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun #if defined(CONFIG_INET) && defined(CONFIG_SLIP_COMPRESSED) 28*4882a593Smuzhiyun # define SL_INCLUDE_CSLIP 29*4882a593Smuzhiyun #endif 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun #ifdef SL_INCLUDE_CSLIP 32*4882a593Smuzhiyun # define SL_MODE_DEFAULT SL_MODE_ADAPTIVE 33*4882a593Smuzhiyun #else 34*4882a593Smuzhiyun # define SL_MODE_DEFAULT SL_MODE_SLIP 35*4882a593Smuzhiyun #endif 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun /* SLIP configuration. */ 38*4882a593Smuzhiyun #define SL_NRUNIT 256 /* MAX number of SLIP channels; 39*4882a593Smuzhiyun This can be overridden with 40*4882a593Smuzhiyun insmod -oslip_maxdev=nnn */ 41*4882a593Smuzhiyun #define SL_MTU 296 /* 296; I am used to 600- FvK */ 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun /* SLIP protocol characters. */ 44*4882a593Smuzhiyun #define END 0300 /* indicates end of frame */ 45*4882a593Smuzhiyun #define ESC 0333 /* indicates byte stuffing */ 46*4882a593Smuzhiyun #define ESC_END 0334 /* ESC ESC_END means END 'data' */ 47*4882a593Smuzhiyun #define ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */ 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun struct slip { 51*4882a593Smuzhiyun int magic; 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun /* Various fields. */ 54*4882a593Smuzhiyun struct tty_struct *tty; /* ptr to TTY structure */ 55*4882a593Smuzhiyun struct net_device *dev; /* easy for intr handling */ 56*4882a593Smuzhiyun spinlock_t lock; 57*4882a593Smuzhiyun struct work_struct tx_work; /* Flushes transmit buffer */ 58*4882a593Smuzhiyun 59*4882a593Smuzhiyun #ifdef SL_INCLUDE_CSLIP 60*4882a593Smuzhiyun struct slcompress *slcomp; /* for header compression */ 61*4882a593Smuzhiyun unsigned char *cbuff; /* compression buffer */ 62*4882a593Smuzhiyun #endif 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun /* These are pointers to the malloc()ed frame buffers. */ 65*4882a593Smuzhiyun unsigned char *rbuff; /* receiver buffer */ 66*4882a593Smuzhiyun int rcount; /* received chars counter */ 67*4882a593Smuzhiyun unsigned char *xbuff; /* transmitter buffer */ 68*4882a593Smuzhiyun unsigned char *xhead; /* pointer to next byte to XMIT */ 69*4882a593Smuzhiyun int xleft; /* bytes left in XMIT queue */ 70*4882a593Smuzhiyun int mtu; /* Our mtu (to spot changes!) */ 71*4882a593Smuzhiyun int buffsize; /* Max buffers sizes */ 72*4882a593Smuzhiyun 73*4882a593Smuzhiyun #ifdef CONFIG_SLIP_MODE_SLIP6 74*4882a593Smuzhiyun int xdata, xbits; /* 6 bit slip controls */ 75*4882a593Smuzhiyun #endif 76*4882a593Smuzhiyun 77*4882a593Smuzhiyun unsigned long flags; /* Flag values/ mode etc */ 78*4882a593Smuzhiyun #define SLF_INUSE 0 /* Channel in use */ 79*4882a593Smuzhiyun #define SLF_ESCAPE 1 /* ESC received */ 80*4882a593Smuzhiyun #define SLF_ERROR 2 /* Parity, etc. error */ 81*4882a593Smuzhiyun #define SLF_KEEPTEST 3 /* Keepalive test flag */ 82*4882a593Smuzhiyun #define SLF_OUTWAIT 4 /* is outpacket was flag */ 83*4882a593Smuzhiyun 84*4882a593Smuzhiyun unsigned char mode; /* SLIP mode */ 85*4882a593Smuzhiyun unsigned char leased; 86*4882a593Smuzhiyun pid_t pid; 87*4882a593Smuzhiyun #define SL_MODE_SLIP 0 88*4882a593Smuzhiyun #define SL_MODE_CSLIP 1 89*4882a593Smuzhiyun #define SL_MODE_SLIP6 2 /* Matt Dillon's printable slip */ 90*4882a593Smuzhiyun #define SL_MODE_CSLIP6 (SL_MODE_SLIP6|SL_MODE_CSLIP) 91*4882a593Smuzhiyun #define SL_MODE_AX25 4 92*4882a593Smuzhiyun #define SL_MODE_ADAPTIVE 8 93*4882a593Smuzhiyun #ifdef CONFIG_SLIP_SMART 94*4882a593Smuzhiyun unsigned char outfill; /* # of sec between outfill packet */ 95*4882a593Smuzhiyun unsigned char keepalive; /* keepalive seconds */ 96*4882a593Smuzhiyun struct timer_list outfill_timer; 97*4882a593Smuzhiyun struct timer_list keepalive_timer; 98*4882a593Smuzhiyun #endif 99*4882a593Smuzhiyun }; 100*4882a593Smuzhiyun 101*4882a593Smuzhiyun #define SLIP_MAGIC 0x5302 102*4882a593Smuzhiyun 103*4882a593Smuzhiyun #endif /* _LINUX_SLIP.H */ 104