85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/*
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* Copyright (C) Ambroz Bizjak <ambrop7@gmail.com>
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* Contributions:
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* Transparent DNS: Copyright (C) Kerem Hadimli <kerem.hadimli@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef BADVPN_PROTOCOL_UDPGW_PROTO_H
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#define BADVPN_PROTOCOL_UDPGW_PROTO_H
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#include <stdint.h>
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#include <misc/bsize.h>
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#include <misc/packed.h>
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#define UDPGW_CLIENT_FLAG_KEEPALIVE (1 << 0)
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#define UDPGW_CLIENT_FLAG_REBIND (1 << 1)
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#define UDPGW_CLIENT_FLAG_DNS (1 << 2)
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#define UDPGW_CLIENT_FLAG_IPV6 (1 << 3)
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B_START_PACKED
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struct udpgw_header {
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uint8_t flags;
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uint16_t conid;
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} B_PACKED;
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B_END_PACKED
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B_START_PACKED
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struct udpgw_addr_ipv4 {
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uint32_t addr_ip;
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uint16_t addr_port;
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} B_PACKED;
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B_END_PACKED
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B_START_PACKED
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struct udpgw_addr_ipv6 {
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uint8_t addr_ip[16];
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uint16_t addr_port;
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} B_PACKED;
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B_END_PACKED
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static int udpgw_compute_mtu (int dgram_mtu)
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{
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bsize_t bs = bsize_add(
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bsize_fromsize(sizeof(struct udpgw_header)),
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bsize_add(
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bsize_max(
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bsize_fromsize(sizeof(struct udpgw_addr_ipv4)),
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bsize_fromsize(sizeof(struct udpgw_addr_ipv6))
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),
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bsize_fromint(dgram_mtu)
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)
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);
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int s;
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if (!bsize_toint(bs, &s)) {
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return -1;
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}
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return s;
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}
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#endif
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