diff options
Diffstat (limited to 'pkg/tcpip/header/icmpv6.go')
| -rw-r--r-- | pkg/tcpip/header/icmpv6.go | 36 |
1 files changed, 31 insertions, 5 deletions
diff --git a/pkg/tcpip/header/icmpv6.go b/pkg/tcpip/header/icmpv6.go index 1125a7d14..b4037b6c8 100644 --- a/pkg/tcpip/header/icmpv6.go +++ b/pkg/tcpip/header/icmpv6.go @@ -25,6 +25,12 @@ import ( type ICMPv6 []byte const ( + // ICMPv6HeaderSize is the size of the ICMPv6 header. That is, the + // sum of the size of the ICMPv6 Type, Code and Checksum fields, as + // per RFC 4443 section 2.1. After the ICMPv6 header, the ICMPv6 + // message body begins. + ICMPv6HeaderSize = 4 + // ICMPv6MinimumSize is the minimum size of a valid ICMP packet. ICMPv6MinimumSize = 8 @@ -37,10 +43,16 @@ const ( // ICMPv6NeighborSolicitMinimumSize is the minimum size of a // neighbor solicitation packet. - ICMPv6NeighborSolicitMinimumSize = ICMPv6MinimumSize + 16 + ICMPv6NeighborSolicitMinimumSize = ICMPv6HeaderSize + NDPNSMinimumSize + + // ICMPv6NeighborAdvertMinimumSize is the minimum size of a + // neighbor advertisement packet. + ICMPv6NeighborAdvertMinimumSize = ICMPv6HeaderSize + NDPNAMinimumSize - // ICMPv6NeighborAdvertSize is size of a neighbor advertisement. - ICMPv6NeighborAdvertSize = 32 + // ICMPv6NeighborAdvertSize is size of a neighbor advertisement + // including the NDP Target Link Layer option for an Ethernet + // address. + ICMPv6NeighborAdvertSize = ICMPv6HeaderSize + NDPNAMinimumSize + ndpTargetEthernetLinkLayerAddressSize // ICMPv6EchoMinimumSize is the minimum size of a valid ICMP echo packet. ICMPv6EchoMinimumSize = 8 @@ -68,6 +80,13 @@ const ( // icmpv6SequenceOffset is the offset of the sequence field // in a ICMPv6 Echo Request/Reply message. icmpv6SequenceOffset = 6 + + // NDPHopLimit is the expected IP hop limit value of 255 for received + // NDP packets, as per RFC 4861 sections 4.1 - 4.5, 6.1.1, 6.1.2, 7.1.1, + // 7.1.2 and 8.1. If the hop limit value is not 255, nodes MUST silently + // drop the NDP packet. All outgoing NDP packets must use this value for + // its IP hop limit field. + NDPHopLimit = 255 ) // ICMPv6Type is the ICMP type field described in RFC 4443 and friends. @@ -113,7 +132,7 @@ func (b ICMPv6) Checksum() uint16 { return binary.BigEndian.Uint16(b[icmpv6ChecksumOffset:]) } -// SetChecksum calculates and sets the ICMP checksum field. +// SetChecksum sets the ICMP checksum field. func (b ICMPv6) SetChecksum(checksum uint16) { binary.BigEndian.PutUint16(b[icmpv6ChecksumOffset:], checksum) } @@ -166,12 +185,19 @@ func (b ICMPv6) SetSequence(sequence uint16) { binary.BigEndian.PutUint16(b[icmpv6SequenceOffset:], sequence) } +// NDPPayload returns the NDP payload buffer. That is, it returns the ICMPv6 +// packet's message body as defined by RFC 4443 section 2.1; the portion of the +// ICMPv6 buffer after the first ICMPv6HeaderSize bytes. +func (b ICMPv6) NDPPayload() []byte { + return b[ICMPv6HeaderSize:] +} + // Payload implements Transport.Payload. func (b ICMPv6) Payload() []byte { return b[ICMPv6PayloadOffset:] } -// ICMPv6Checksum calculates the ICMP checksum over the provided ICMP header, +// ICMPv6Checksum calculates the ICMP checksum over the provided ICMPv6 header, // IPv6 src/dst addresses and the payload. func ICMPv6Checksum(h ICMPv6, src, dst tcpip.Address, vv buffer.VectorisedView) uint16 { // Calculate the IPv6 pseudo-header upper-layer checksum. |