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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 | |
26 | #if defined(CONFIG_INET) && defined(CONFIG_SLIP_COMPRESSED) |
27 | # define SL_INCLUDE_CSLIP |
28 | #endif |
29 | |
30 | #ifdef SL_INCLUDE_CSLIP |
31 | # define SL_MODE_DEFAULT SL_MODE_ADAPTIVE |
32 | #else |
33 | # define SL_MODE_DEFAULT SL_MODE_SLIP |
34 | #endif |
35 | |
36 | /* SLIP configuration. */ |
37 | #define SL_NRUNIT 256 /* MAX number of SLIP channels; |
38 | This can be overridden with |
39 | insmod -oslip_maxdev=nnn */ |
40 | #define SL_MTU 296 /* 296; I am used to 600- FvK */ |
41 | |
42 | /* SLIP protocol characters. */ |
43 | #define END 0300 /* indicates end of frame */ |
44 | #define ESC 0333 /* indicates byte stuffing */ |
45 | #define ESC_END 0334 /* ESC ESC_END means END 'data' */ |
46 | #define ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */ |
47 | |
48 | |
49 | struct slip { |
50 | int magic; |
51 | |
52 | /* Various fields. */ |
53 | struct tty_struct *tty; /* ptr to TTY structure */ |
54 | struct net_device *dev; /* easy for intr handling */ |
55 | spinlock_t lock; |
56 | |
57 | #ifdef SL_INCLUDE_CSLIP |
58 | struct slcompress *slcomp; /* for header compression */ |
59 | unsigned char *cbuff; /* compression buffer */ |
60 | #endif |
61 | |
62 | /* These are pointers to the malloc()ed frame buffers. */ |
63 | unsigned char *rbuff; /* receiver buffer */ |
64 | int rcount; /* received chars counter */ |
65 | unsigned char *xbuff; /* transmitter buffer */ |
66 | unsigned char *xhead; /* pointer to next byte to XMIT */ |
67 | int xleft; /* bytes left in XMIT queue */ |
68 | |
69 | /* SLIP interface statistics. */ |
70 | unsigned long rx_packets; /* inbound frames counter */ |
71 | unsigned long tx_packets; /* outbound frames counter */ |
72 | unsigned long rx_bytes; /* inbound byte counte */ |
73 | unsigned long tx_bytes; /* outbound byte counter */ |
74 | unsigned long rx_errors; /* Parity, etc. errors */ |
75 | unsigned long tx_errors; /* Planned stuff */ |
76 | unsigned long rx_dropped; /* No memory for skb */ |
77 | unsigned long tx_dropped; /* When MTU change */ |
78 | unsigned long rx_over_errors; /* Frame bigger than SLIP buf. */ |
79 | #ifdef SL_INCLUDE_CSLIP |
80 | unsigned long tx_compressed; |
81 | unsigned long rx_compressed; |
82 | unsigned long tx_misses; |
83 | #endif |
84 | /* Detailed SLIP statistics. */ |
85 | |
86 | int mtu; /* Our mtu (to spot changes!) */ |
87 | int buffsize; /* Max buffers sizes */ |
88 | |
89 | #ifdef CONFIG_SLIP_MODE_SLIP6 |
90 | int xdata, xbits; /* 6 bit slip controls */ |
91 | #endif |
92 | |
93 | unsigned long flags; /* Flag values/ mode etc */ |
94 | #define SLF_INUSE 0 /* Channel in use */ |
95 | #define SLF_ESCAPE 1 /* ESC received */ |
96 | #define SLF_ERROR 2 /* Parity, etc. error */ |
97 | #define SLF_KEEPTEST 3 /* Keepalive test flag */ |
98 | #define SLF_OUTWAIT 4 /* is outpacket was flag */ |
99 | |
100 | unsigned char mode; /* SLIP mode */ |
101 | unsigned char leased; |
102 | dev_t line; |
103 | pid_t pid; |
104 | #define SL_MODE_SLIP 0 |
105 | #define SL_MODE_CSLIP 1 |
106 | #define SL_MODE_SLIP6 2 /* Matt Dillon's printable slip */ |
107 | #define SL_MODE_CSLIP6 (SL_MODE_SLIP6|SL_MODE_CSLIP) |
108 | #define SL_MODE_AX25 4 |
109 | #define SL_MODE_ADAPTIVE 8 |
110 | #ifdef CONFIG_SLIP_SMART |
111 | unsigned char outfill; /* # of sec between outfill packet */ |
112 | unsigned char keepalive; /* keepalive seconds */ |
113 | struct timer_list outfill_timer; |
114 | struct timer_list keepalive_timer; |
115 | #endif |
116 | }; |
117 | |
118 | #define SLIP_MAGIC 0x5302 |
119 | |
120 | #endif /* _LINUX_SLIP.H */ |
121 |
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