1 /*        $NetBSD: if_tun.h,v 1.22 2022/03/13 21:32:43 riastradh Exp $          */
2 
3 /*
4  * Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk>
5  * Nottingham University 1987.
6  *
7  * This source may be freely distributed, however I would be interested
8  * in any changes that are made.
9  *
10  * This driver takes packets off the IP i/f and hands them up to a
11  * user process to have its wicked way with. This driver has its
12  * roots in a similar driver written by Phil Cockcroft (formerly) at
13  * UCL. This driver is based much more on read/write/select mode of
14  * operation though.
15  *
16  * from: Header: if_tnreg.h,v 1.1.2.1 1992/07/16 22:39:16 friedl Exp
17  */
18 
19 #ifndef _NET_IF_TUN_H_
20 #define _NET_IF_TUN_H_
21 
22 #include <sys/ioccom.h>
23 
24 #ifdef _KERNEL
25 
26 #include <sys/types.h>
27 
28 #include <sys/condvar.h>
29 #include <sys/mutex.h>
30 #include <sys/queue.h>
31 #include <sys/select.h>
32 
33 #include <net/if.h>
34 
35 struct tun_softc {
36           struct    ifnet tun_if;                 /* the interface */
37 
38           u_short   tun_flags;                    /* misc flags */
39 #define   TUN_OPEN  0x0001
40 #define   TUN_INITED          0x0002
41 #define   TUN_RCOLL 0x0004
42 #define   TUN_IASET 0x0008
43 #define   TUN_DSTADDR         0x0010
44 #define   TUN_UNUSED0         0x0040    /* was TUN_RWAIT */
45 #define   TUN_ASYNC 0x0080
46 #define   TUN_NBIO  0x0100
47 #define   TUN_PREPADDR        0x0200
48 #define   TUN_IFHEAD          0x0400
49 
50 #define   TUN_READY (TUN_OPEN | TUN_INITED | TUN_IASET)
51 
52           pid_t     tun_pgid;           /* PID or process group ID */
53           struct    selinfo   tun_rsel; /* read select */
54           struct    selinfo   tun_wsel; /* write select (not used) */
55           int       tun_unit;           /* the tunnel unit number */
56           kmutex_t tun_lock;            /* lock for this tunnel */
57           kcondvar_t tun_cv;            /* condition variable for tunnel */
58           LIST_ENTRY(tun_softc) tun_list;         /* list of all tuns */
59           void      *tun_osih;                    /* soft interrupt handle */
60           void      *tun_isih;                    /* soft interrupt handle */
61 };
62 #endif    /* _KERNEL */
63 
64 /* Maximum packet size */
65 #define   TUNMTU              1500
66 
67 /* ioctl's for get/set debug */
68 #define   TUNSDEBUG _IOW('t', 90, int)
69 #define   TUNGDEBUG _IOR('t', 89, int)
70 #define   TUNSIFMODE          _IOW('t', 88, int)
71 #define   TUNSLMODE _IOW('t', 87, int)
72 #define   TUNSIFHEAD          _IOW('t', 66, int)
73 #define   TUNGIFHEAD          _IOR('t', 65, int)
74 
75 #endif /* !_NET_IF_TUN_H_ */
76