BadVPN – Blame information for rev 1

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1 office 1 /*
2 * Copyright (C) Ambroz Bizjak <ambrop7@gmail.com>
3 * Contributions:
4 * Transparent DNS: Copyright (C) Kerem Hadimli <kerem.hadimli@gmail.com>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the author nor the
14 * names of its contributors may be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28  
29 #ifndef BADVPN_PROTOCOL_UDPGW_PROTO_H
30 #define BADVPN_PROTOCOL_UDPGW_PROTO_H
31  
32 #include <stdint.h>
33  
34 #include <misc/bsize.h>
35 #include <misc/packed.h>
36  
37 #define UDPGW_CLIENT_FLAG_KEEPALIVE (1 << 0)
38 #define UDPGW_CLIENT_FLAG_REBIND (1 << 1)
39 #define UDPGW_CLIENT_FLAG_DNS (1 << 2)
40 #define UDPGW_CLIENT_FLAG_IPV6 (1 << 3)
41  
42 B_START_PACKED
43 struct udpgw_header {
44 uint8_t flags;
45 uint16_t conid;
46 } B_PACKED;
47 B_END_PACKED
48  
49 B_START_PACKED
50 struct udpgw_addr_ipv4 {
51 uint32_t addr_ip;
52 uint16_t addr_port;
53 } B_PACKED;
54 B_END_PACKED
55  
56 B_START_PACKED
57 struct udpgw_addr_ipv6 {
58 uint8_t addr_ip[16];
59 uint16_t addr_port;
60 } B_PACKED;
61 B_END_PACKED
62  
63 static int udpgw_compute_mtu (int dgram_mtu)
64 {
65 bsize_t bs = bsize_add(
66 bsize_fromsize(sizeof(struct udpgw_header)),
67 bsize_add(
68 bsize_max(
69 bsize_fromsize(sizeof(struct udpgw_addr_ipv4)),
70 bsize_fromsize(sizeof(struct udpgw_addr_ipv6))
71 ),
72 bsize_fromint(dgram_mtu)
73 )
74 );
75  
76 int s;
77 if (!bsize_toint(bs, &s)) {
78 return -1;
79 }
80  
81 return s;
82 }
83  
84 #endif