/* SPDX-License-Identifier: GPL-2.0 */ /* * slip.h Define the SLIP device driver interface and constants. * * NOTE: THIS FILE WILL BE MOVED TO THE LINUX INCLUDE DIRECTORY * AS SOON AS POSSIBLE! * * Version: @(#)slip.h 1.2.0 03/28/93 * * Fixes: * Alan Cox : Added slip mtu field. * Matt Dillon : Printable slip (borrowed from net2e) * Alan Cox : Added SL_SLIP_LOTS * Dmitry Gorodchanin : A lot of changes in the 'struct slip' * Dmitry Gorodchanin : Added CSLIP statistics. * Stanislav Voronyi : Make line checking as created by * Igor Chechik, RELCOM Corp. * Craig Schlenter : Fixed #define bug that caused * CSLIP telnets to hang in 1.3.61-6 * * Author: Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> */ #ifndef _LINUX_SLIP_H #define _LINUX_SLIP_H #if defined(CONFIG_INET) && defined(CONFIG_SLIP_COMPRESSED) # define SL_INCLUDE_CSLIP #endif #ifdef SL_INCLUDE_CSLIP # define SL_MODE_DEFAULT SL_MODE_ADAPTIVE #else # define SL_MODE_DEFAULT SL_MODE_SLIP #endif /* SLIP configuration. */ #define SL_NRUNIT 256 /* MAX number of SLIP channels; This can be overridden with insmod -oslip_maxdev=nnn */ #define SL_MTU 296 /* 296; I am used to 600- FvK */ /* some arch define END as assembly function ending, just undef it */ #undef END /* SLIP protocol characters. */ #define END 0300 /* indicates end of frame */ #define ESC 0333 /* indicates byte stuffing */ #define ESC_END 0334 /* ESC ESC_END means END 'data' */ #define ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */ struct slip { int magic; /* Various fields. */ struct tty_struct *tty; /* ptr to TTY structure */ struct net_device *dev; /* easy for intr handling */ spinlock_t lock; struct work_struct tx_work; /* Flushes transmit buffer */ #ifdef SL_INCLUDE_CSLIP struct slcompress *slcomp; /* for header compression */ unsigned char *cbuff; /* compression buffer */ #endif /* These are pointers to the malloc()ed frame buffers. */ unsigned char *rbuff; /* receiver buffer */ int rcount; /* received chars counter */ unsigned char *xbuff; /* transmitter buffer */ unsigned char *xhead; /* pointer to next byte to XMIT */ int xleft; /* bytes left in XMIT queue */ int mtu; /* Our mtu (to spot changes!) */ int buffsize; /* Max buffers sizes */ #ifdef CONFIG_SLIP_MODE_SLIP6 int xdata, xbits; /* 6 bit slip controls */ #endif unsigned long flags; /* Flag values/ mode etc */ #define SLF_INUSE 0 /* Channel in use */ #define SLF_ESCAPE 1 /* ESC received */ #define SLF_ERROR 2 /* Parity, etc. error */ #define SLF_KEEPTEST 3 /* Keepalive test flag */ #define SLF_OUTWAIT 4 /* is outpacket was flag */ unsigned char mode; /* SLIP mode */ unsigned char leased; pid_t pid; #define SL_MODE_SLIP 0 #define SL_MODE_CSLIP 1 #define SL_MODE_SLIP6 2 /* Matt Dillon's printable slip */ #define SL_MODE_CSLIP6 (SL_MODE_SLIP6|SL_MODE_CSLIP) #define SL_MODE_AX25 4 #define SL_MODE_ADAPTIVE 8 #ifdef CONFIG_SLIP_SMART unsigned char outfill; /* # of sec between outfill packet */ unsigned char keepalive; /* keepalive seconds */ struct timer_list outfill_timer; struct timer_list keepalive_timer; #endif }; #define SLIP_MAGIC 0x5302 #endif /* _LINUX_SLIP.H */
