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UDS: Clarify comment about the first 4 bytes of the SecureData header.
It is likely that these 4 bytes are actually a different header, part of some protocol that encapsulates the SecureData protocol.
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@ -40,7 +40,9 @@ static std::vector<u8> GenerateSecureDataHeader(u16 data_size, u8 channel, u16 d
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u16 src_node_id, u16 sequence_number) {
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u16 src_node_id, u16 sequence_number) {
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SecureDataHeader header{};
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SecureDataHeader header{};
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header.protocol_size = data_size + sizeof(SecureDataHeader);
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header.protocol_size = data_size + sizeof(SecureDataHeader);
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// TODO(Subv): It is likely that the first 4 bytes of this header are actually a decorator for another protocol.
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// Note: This size includes everything except the first 4 bytes of the structure,
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// reinforcing the hypotheses that the first 4 bytes are actually the header of
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// another container protocol.
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header.securedata_size = data_size + sizeof(SecureDataHeader) - 4;
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header.securedata_size = data_size + sizeof(SecureDataHeader) - 4;
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header.is_management = 0; // Frames sent by the emulated application are never UDS management frames
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header.is_management = 0; // Frames sent by the emulated application are never UDS management frames
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header.data_channel = channel;
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header.data_channel = channel;
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@ -45,6 +45,8 @@ static_assert(sizeof(LLCHeader) == 8, "LLCHeader has the wrong size");
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* the source and destination network node ids.
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* the source and destination network node ids.
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*/
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*/
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struct SecureDataHeader {
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struct SecureDataHeader {
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// TODO(Subv): It is likely that the first 4 bytes of this header are
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// actually part of another container protocol.
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u16_be protocol_size;
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u16_be protocol_size;
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INSERT_PADDING_BYTES(2);
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INSERT_PADDING_BYTES(2);
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u16_be securedata_size;
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u16_be securedata_size;
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