1/*
2 *  OpenVPN -- An application to securely tunnel IP networks
3 *             over a single UDP port, with support for SSL/TLS-based
4 *             session authentication and key exchange,
5 *             packet encryption, packet authentication, and
6 *             packet compression.
7 *
8 *  Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
9 *
10 *  This program is free software; you can redistribute it and/or modify
11 *  it under the terms of the GNU General Public License version 2
12 *  as published by the Free Software Foundation.
13 *
14 *  This program is distributed in the hope that it will be useful,
15 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 *  GNU General Public License for more details.
18 *
19 *  You should have received a copy of the GNU General Public License
20 *  along with this program (see the file COPYING included with this
21 *  distribution); if not, write to the Free Software Foundation, Inc.,
22 *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
23 */
24
25#ifndef GREMLIN_H
26#define GREMLIN_H
27
28#ifdef ENABLE_DEBUG
29
30/*
31 * Gremlin options, presented as bitmask argument to --gremlin directive
32 */
33
34#define GREMLIN_CONNECTION_FLOOD_SHIFT   (0)
35#define GREMLIN_CONNECTION_FLOOD_MASK    (0x07)
36
37#define GREMLIN_PACKET_FLOOD_SHIFT       (3)
38#define GREMLIN_PACKET_FLOOD_MASK        (0x03)
39
40#define GREMLIN_CORRUPT_SHIFT            (5)
41#define GREMLIN_CORRUPT_MASK             (0x03)
42
43#define GREMLIN_UP_DOWN_SHIFT            (7)
44#define GREMLIN_UP_DOWN_MASK             (0x03)
45
46/* 512:1/500 1024:1/100 1536:1/50 */
47
48#define GREMLIN_DROP_SHIFT               (9)
49#define GREMLIN_DROP_MASK                (0x03)
50
51/* extract gremlin parms */
52
53#define GREMLIN_CONNECTION_FLOOD_LEVEL(x) (((x)>>GREMLIN_CONNECTION_FLOOD_SHIFT) & GREMLIN_CONNECTION_FLOOD_MASK)
54#define GREMLIN_PACKET_FLOOD_LEVEL(x)     (((x)>>GREMLIN_PACKET_FLOOD_SHIFT)     & GREMLIN_PACKET_FLOOD_MASK)
55#define GREMLIN_CORRUPT_LEVEL(x)          (((x)>>GREMLIN_CORRUPT_SHIFT)          & GREMLIN_CORRUPT_MASK)
56#define GREMLIN_UP_DOWN_LEVEL(x)          (((x)>>GREMLIN_UP_DOWN_SHIFT)          & GREMLIN_UP_DOWN_MASK)
57#define GREMLIN_DROP_LEVEL(x)             (((x)>>GREMLIN_DROP_SHIFT)             & GREMLIN_DROP_MASK)
58
59#include "buffer.h"
60
61struct packet_flood_parms
62{
63  int n_packets;
64  int packet_size;
65};
66
67bool ask_gremlin (int flags);
68void corrupt_gremlin (struct buffer* buf, int flags);
69struct packet_flood_parms get_packet_flood_parms (int level);
70
71#endif
72#endif
73