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1da177e4 LT |
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 | dev_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 | #define SLIP_MAGIC 0x5302 | |
120 | ||
121 | #endif /* _LINUX_SLIP.H */ |