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Add parsing of well known IPv6 extension headers (#287)

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* Add parsing of well known IPv6 extension headers

Add classes for IPv6 extension headers defined in the IPv6 protocol
specification (RFC 2460) as well as functions for creating them from
the IPv6 class' ext_header type.

The currently known extension headers are Hop-By-Hop Option,
Destination Routing, Routing and Fragment.

* Cleanup after PR #287 comments

Pull in stuff from the std namespace with "using" instead of
qualifying with std::.

Keep starting braces on the same line.

Avoid potential copy when appending to vector.
This commit is contained in:
Kasper Laudrup
2018-03-29 06:05:01 +02:00
committed by Matias Fontanini
parent 342e2c77a7
commit fa79582b89
4 changed files with 180 additions and 0 deletions
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54
tests/src/ipv6_test.cpp
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@@ -366,3 +366,57 @@ TEST_F(IPv6Test, HopByHopPadding) {
ipv6_header.add_header(IPv6::ExtensionHeader::HOP_BY_HOP);
EXPECT_EQ(48UL, ipv6_header.serialize().size());
}
TEST_F(IPv6Test, HopByHopParsing) {
EthernetII pkt(hop_by_hop_options, sizeof(hop_by_hop_options));
IPv6& ipv6 = pkt.rfind_pdu<IPv6>();
const IPv6::headers_type& headers = ipv6.headers();
EXPECT_EQ(1UL, headers.size());
const IPv6::ext_header* ext_header = ipv6.search_header(IPv6::ExtensionHeader::HOP_BY_HOP);
EXPECT_TRUE(ext_header != NULL);
const IPv6::hop_by_hop_header hbh_header = IPv6::hop_by_hop_header::from_extension_header(*ext_header);
EXPECT_EQ(1UL, hbh_header.options.size());
EXPECT_EQ(5, hbh_header.options[0].first);
}
TEST_F(IPv6Test, HopByHopExtensionHeader) {
const uint8_t options[] = {42, 3, 0, 0, 0, 86, 0, 17, 2, 0, 0, 1, 2, 0, 0};
IPv6::ext_header hdr(IPv6::HOP_BY_HOP, options, options + sizeof(options));
IPv6::hop_by_hop_header header = IPv6::hop_by_hop_header::from_extension_header(hdr);
EXPECT_EQ(3UL, header.options.size());
EXPECT_EQ(42, header.options[0].first);
EXPECT_EQ(86, header.options[1].first);
EXPECT_EQ(17, header.options[2].first);
}
TEST_F(IPv6Test, DestinationRoutingExtensionHeader) {
EXPECT_THROW(IPv6::destination_routing_header::from_extension_header(IPv6::HOP_BY_HOP),
invalid_ipv6_extension_header);
IPv6::destination_routing_header header = IPv6::destination_routing_header::from_extension_header(IPv6::DESTINATION_ROUTING_OPTIONS);
EXPECT_EQ(0UL, header.options.size());
}
TEST_F(IPv6Test, RoutingExtensionHeader) {
const uint8_t header_data[] = {42, 17, 0, 0, 0, 0, 0};
IPv6::ext_header hdr(IPv6::ROUTING, header_data, header_data + sizeof(header_data));
IPv6::routing_header header = IPv6::routing_header::from_extension_header(hdr);
EXPECT_EQ(42, header.routing_type);
EXPECT_EQ(17, header.segments_left);
EXPECT_EQ(5UL, header.data.size());
}
TEST_F(IPv6Test, FragmentExtensionHeader) {
const uint8_t header_data[] = {128, 1, 0, 0, 0, 42};
IPv6::ext_header hdr(IPv6::FRAGMENT, header_data, header_data + sizeof(header_data));
IPv6::fragment_header header = IPv6::fragment_header::from_extension_header(hdr);
EXPECT_EQ(4096, header.fragment_offset);
EXPECT_TRUE(header.more_fragments);
EXPECT_EQ(42UL, header.identification);
}