58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
#include "VpnPacket.hpp"
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#include "VpnPeer.hpp"
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#include <chrono>
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const size_t VpnPacket::VPN_HEADER_BYTES = 8;
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uint32_t VpnPacket::_next_general_seqno = 0;
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static const size_t OUTER_HEADERS_BYTES =
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40 /* IPv6 header */ + 8 /* UDP header */;
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// We use a TUN device, hence we don't have a layer 2 header.
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static const int
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DATA_SEQNO_POS = 0,
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DATA_TIMESTAMP_POS = 4;
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VpnPacket::VpnPacket(size_t mtu)
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: _peer(nullptr), _data_space(mtu-OUTER_HEADERS_BYTES), _data_size(0),
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_reception_timestamp(0)
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{
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_data = new char[mtu - OUTER_HEADERS_BYTES];
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}
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VpnPacket::~VpnPacket() {
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delete[] _data;
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}
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bool VpnPacket::parse_as_ipv6() {
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return parse_ipv6_header(get_payload(), get_payload_size(), _ipv6_header);
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}
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uint32_t VpnPacket::get_seqno() const {
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return *(uint32_t*)(_data + DATA_SEQNO_POS);
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}
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uint32_t VpnPacket::get_sending_timestamp() const {
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return *(uint32_t*)(_data + DATA_TIMESTAMP_POS);
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}
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void VpnPacket::prepare_for_sending() {
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*(uint32_t*)(_data + DATA_SEQNO_POS) = next_seqno();
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*(uint32_t*)(_data + DATA_TIMESTAMP_POS) =
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std::chrono::time_point_cast<std::chrono::microseconds>(
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std::chrono::steady_clock::now()).time_since_epoch().count();
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}
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void VpnPacket::upon_reception() {
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_reception_timestamp =
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std::chrono::time_point_cast<std::chrono::microseconds>(
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std::chrono::steady_clock::now()).time_since_epoch().count();
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}
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uint32_t VpnPacket::next_seqno() {
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if(_peer)
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return _peer->next_seqno();
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return _next_general_seqno++;
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}
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