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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 <tins/mpls.h>
#include <tins/ip.h>
#include <tins/ipv6.h>
#include <tins/rawpdu.h>
#include <tins/memory_helpers.h>
#include <tins/icmp_extension.h>
using Tins::Memory::InputMemoryStream;
using Tins::Memory::OutputMemoryStream;
namespace Tins {
MPLS::MPLS() : header_() {
}
MPLS::MPLS(const ICMPExtension& extension) {
InputMemoryStream stream(extension.payload());
stream.read(header_);
}
MPLS::MPLS(const uint8_t* buffer, uint32_t total_sz) {
InputMemoryStream stream(buffer, total_sz);
stream.read(header_);
if (stream) {
// If this is the last MPLS, then construct an IP
if (bottom_of_stack()) {
uint8_t version = (*stream.pointer() >> 4) & 0x0f;
if (version == 4) {
inner_pdu(new Tins::IP(stream.pointer(), stream.size()));
}
else if (version == 6) {
inner_pdu(new Tins::IPv6(stream.pointer(), stream.size()));
}
else {
inner_pdu(new Tins::RawPDU(stream.pointer(), stream.size()));
}
}
else {
inner_pdu(new MPLS(stream.pointer(), stream.size()));
}
}
}
void MPLS::label(small_uint<20> value) {
const uint32_t label_value = value;
const uint16_t label_high = Endian::host_to_be<uint16_t>(label_value >> 4);
const uint8_t label_low = (label_value << 4) & 0xf0;
header_.label_high = label_high & 0xffff;
header_.label_low_exp_and_bottom = (header_.label_low_exp_and_bottom & 0x0f) | label_low;
}
void MPLS::experimental(small_uint<3> value) {
header_.label_low_exp_and_bottom = (header_.label_low_exp_and_bottom & 0xf1) | (value << 1);
}
void MPLS::bottom_of_stack(small_uint<1> value) {
header_.label_low_exp_and_bottom = (header_.label_low_exp_and_bottom & 0xfe) | value;
}
void MPLS::ttl(uint8_t value) {
header_.ttl = value;
}
uint32_t MPLS::header_size() const {
return sizeof(header_);
}
void MPLS::write_serialization(uint8_t* buffer, uint32_t total_sz) {
OutputMemoryStream stream(buffer, total_sz);
// If we have a parent PDU, we might set the bottom-of-stack field
if (parent_pdu()) {
// We'll set it if we either don't have a child or we have one and it's not MPLS
if (!inner_pdu() || inner_pdu()->pdu_type() != PDU::MPLS) {
bottom_of_stack(1);
}
}
stream.write(header_);
}
} // Tins
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