test_skipVlanTags.cpp

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#include <gtest/gtest.h>
 
#include <array>
#include <cstdint>
 
#include "profinet/protocol.h"
#include "profinet/util.h"
 
namespace
{
constexpr std::array<std::uint8_t, 6> kControllerMac{0x00, 0x11, 0x22, 0x33, 0x44, 0x55};
constexpr std::array<std::uint8_t, 6> kDeviceMac{0x02, 0x00, 0x00, 0x00, 0x00, 0x01};
constexpr std::array<std::uint8_t, 4> kVlanTag{0x81, 0x00, 0xC0, 0x00};
constexpr std::uint16_t kProfinetEtherType = 0x8892;
} // namespace
 
namespace profinet
{
namespace
{
class SkipVlanTagsTest : public ::testing::Test
{
 protected:
  static Bytes BuildUntaggedFrame()
  {
    Bytes frame{kDeviceMac.begin(), kDeviceMac.end()};
    frame.insert(frame.end(), kControllerMac.begin(), kControllerMac.end());
    frame.push_back(static_cast<std::uint8_t>((kProfinetEtherType >> 8U) & 0xFFU));
    frame.push_back(static_cast<std::uint8_t>(kProfinetEtherType & 0xFFU));
    frame.insert(frame.end(), 50U, 0x00);
    return frame;
  }
};
} // namespace
TEST_F(SkipVlanTagsTest, UntaggedFrameReturnsOffset12)
{
  const Bytes frame = BuildUntaggedFrame();
  EXPECT_EQ(SkipVlanTags(frame), 12U);
}
 
TEST_F(SkipVlanTagsTest, Single8021QTagReturnsOffset16)
{
  Bytes frame = BuildUntaggedFrame();
 
  frame.insert(frame.begin() + 12, kVlanTag.begin(), kVlanTag.end());
 
  EXPECT_EQ(SkipVlanTags(frame), 16U);
}
 
TEST_F(SkipVlanTagsTest, DoubleTaggedQinQFrameReturnsOffset20)
{
  Bytes frame{kDeviceMac.begin(), kDeviceMac.end()};
 
  frame.insert(frame.end(), kControllerMac.begin(), kControllerMac.end());
 
  // QinQ outer tag.
  frame.insert(frame.end(), {0x88, 0xA8, 0x00, 0x00});
 
  frame.insert(frame.end(), kVlanTag.begin(), kVlanTag.end());
 
  frame.insert(frame.end(), {0x88, 0x92});
 
  frame.insert(frame.end(), 50U, 0x00);
 
  EXPECT_EQ(SkipVlanTags(frame), 20U);
}
 
TEST_F(SkipVlanTagsTest, ShortFrameReturnsEthernetHeaderLength)
{
  const Bytes frame(13U, 0x00);
 
  EXPECT_EQ(SkipVlanTags(frame), 12U);
}
} // namespace profinet