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/*
* Copyright (c) 2017, Matias Fontanini
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <cstring>
#include <tins/dot1q.h>
#include <tins/exceptions.h>
#include <tins/memory_helpers.h>
#include <tins/detail/pdu_helpers.h>
using Tins::Memory::InputMemoryStream;
using Tins::Memory::OutputMemoryStream;
namespace Tins {
PDU::metadata Dot1Q::extract_metadata(const uint8_t* /*buffer*/, uint32_t total_sz) {
if (TINS_UNLIKELY(total_sz < sizeof(dot1q_header))) {
throw malformed_packet();
}
return metadata(sizeof(dot1q_header), pdu_flag, PDU::UNKNOWN);
}
Dot1Q::Dot1Q(small_uint<12> tag_id, bool append_pad)
: header_(), append_padding_(append_pad) {
id(tag_id);
}
Dot1Q::Dot1Q(const uint8_t* buffer, uint32_t total_sz)
: append_padding_() {
InputMemoryStream stream(buffer, total_sz);
stream.read(header_);
if (stream) {
inner_pdu(
Internals::pdu_from_flag(
(Constants::Ethernet::e)payload_type(),
stream.pointer(),
stream.size()
)
);
}
}
void Dot1Q::priority(small_uint<3> new_priority) {
header_.priority = new_priority;
}
void Dot1Q::cfi(small_uint<1> new_cfi) {
header_.cfi = new_cfi;
}
void Dot1Q::id(small_uint<12> new_id) {
#if TINS_IS_LITTLE_ENDIAN
header_.idL = new_id & 0xff;
header_.idH = new_id >> 8;
#else
header_.id = new_id;
#endif
}
void Dot1Q::payload_type(uint16_t new_type) {
header_.type = Endian::host_to_be(new_type);
}
uint32_t Dot1Q::header_size() const {
return sizeof(header_);
}
uint32_t Dot1Q::trailer_size() const {
if (append_padding_) {
uint32_t total_size = sizeof(header_);
if (inner_pdu()) {
total_size += inner_pdu()->size();
}
return (total_size > 50) ? 0 : (50 - total_size);
}
else {
return 0;
}
}
void Dot1Q::write_serialization(uint8_t* buffer, uint32_t total_sz) {
OutputMemoryStream stream(buffer, total_sz);
if (inner_pdu()) {
Constants::Ethernet::e flag = Constants::Ethernet::UNKNOWN;
PDUType type = inner_pdu()->pdu_type();
// Set the appropriate payload type flag
flag = Internals::pdu_flag_to_ether_type(type);
if (flag != Constants::Ethernet::UNKNOWN) {
payload_type(static_cast<uint16_t>(flag));
}
}
else {
payload_type(0);
}
stream.write(header_);
// Skip inner PDU size
if (inner_pdu()) {
stream.skip(inner_pdu()->size());
}
// Write trailer
stream.fill(trailer_size(), 0);
}
#if TINS_IS_LITTLE_ENDIAN
uint16_t Dot1Q::get_id(const dot1q_header* hdr) {
return hdr->idL | (hdr->idH << 8);
}
#else
uint16_t Dot1Q::get_id(const dot1q_header* hdr) {
return hdr->id;
}
#endif
void Dot1Q::append_padding(bool value) {
append_padding_ = value;
}
bool Dot1Q::matches_response(const uint8_t* ptr, uint32_t total_sz) const {
if (total_sz < sizeof(header_)) {
return false;
}
const dot1q_header* dot1q_ptr = (const dot1q_header*)ptr;
if (get_id(dot1q_ptr) == get_id(&header_)) {
ptr += sizeof(header_);
total_sz -= sizeof(header_);
return inner_pdu() ? inner_pdu()->matches_response(ptr, total_sz) : true;
}
return false;
}
} // Tins
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