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
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