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author | gVisor bot <gvisor-bot@google.com> | 2020-01-28 05:03:50 +0000 |
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committer | gVisor bot <gvisor-bot@google.com> | 2020-01-28 05:03:50 +0000 |
commit | af93fa795f60a07ebb2fadab3316fdfde9478af1 (patch) | |
tree | 7b5d2141a50395fa86deb823db2dc7b339528310 /pkg/tcpip/header/ndp_options.go | |
parent | 76c541f453dc747b971ef164035d77a664062a79 (diff) | |
parent | 2a2da5be31ea3c32e66f0c0ff61ef189848f5258 (diff) |
Merge release-20200115.0-115-g2a2da5b (automated)
Diffstat (limited to 'pkg/tcpip/header/ndp_options.go')
-rwxr-xr-x | pkg/tcpip/header/ndp_options.go | 52 |
1 files changed, 47 insertions, 5 deletions
diff --git a/pkg/tcpip/header/ndp_options.go b/pkg/tcpip/header/ndp_options.go index 06e0bace2..1e60f3d4f 100755 --- a/pkg/tcpip/header/ndp_options.go +++ b/pkg/tcpip/header/ndp_options.go @@ -24,13 +24,17 @@ import ( ) const ( - // NDPTargetLinkLayerAddressOptionType is the type of the Target - // Link-Layer Address option, as per RFC 4861 section 4.6.1. + // NDPSourceLinkLayerAddressOptionType is the type of the Source Link Layer + // Address option, as per RFC 4861 section 4.6.1. + NDPSourceLinkLayerAddressOptionType = 1 + + // NDPTargetLinkLayerAddressOptionType is the type of the Target Link Layer + // Address option, as per RFC 4861 section 4.6.1. NDPTargetLinkLayerAddressOptionType = 2 - // ndpTargetEthernetLinkLayerAddressSize is the size of a Target - // Link Layer Option for an Ethernet address. - ndpTargetEthernetLinkLayerAddressSize = 8 + // ndpLinkLayerAddressSize is the size of a Source or Target Link Layer + // Address option. + ndpLinkLayerAddressSize = 8 // NDPPrefixInformationType is the type of the Prefix Information // option, as per RFC 4861 section 4.6.2. @@ -189,6 +193,9 @@ func (i *NDPOptionIterator) Next() (NDPOption, bool, error) { i.opts = i.opts[numBytes:] switch t { + case NDPSourceLinkLayerAddressOptionType: + return NDPSourceLinkLayerAddressOption(body), false, nil + case NDPTargetLinkLayerAddressOptionType: return NDPTargetLinkLayerAddressOption(body), false, nil @@ -368,6 +375,41 @@ func (b NDPOptionsSerializer) Length() int { return l } +// NDPSourceLinkLayerAddressOption is the NDP Source Link Layer Option +// as defined by RFC 4861 section 4.6.1. +// +// It is the first X bytes following the NDP option's Type and Length field +// where X is the value in Length multiplied by lengthByteUnits - 2 bytes. +type NDPSourceLinkLayerAddressOption tcpip.LinkAddress + +// Type implements NDPOption.Type. +func (o NDPSourceLinkLayerAddressOption) Type() uint8 { + return NDPSourceLinkLayerAddressOptionType +} + +// Length implements NDPOption.Length. +func (o NDPSourceLinkLayerAddressOption) Length() int { + return len(o) +} + +// serializeInto implements NDPOption.serializeInto. +func (o NDPSourceLinkLayerAddressOption) serializeInto(b []byte) int { + return copy(b, o) +} + +// EthernetAddress will return an ethernet (MAC) address if the +// NDPSourceLinkLayerAddressOption's body has at minimum EthernetAddressSize +// bytes. If the body has more than EthernetAddressSize bytes, only the first +// EthernetAddressSize bytes are returned as that is all that is needed for an +// Ethernet address. +func (o NDPSourceLinkLayerAddressOption) EthernetAddress() tcpip.LinkAddress { + if len(o) >= EthernetAddressSize { + return tcpip.LinkAddress(o[:EthernetAddressSize]) + } + + return tcpip.LinkAddress([]byte(nil)) +} + // NDPTargetLinkLayerAddressOption is the NDP Target Link Layer Option // as defined by RFC 4861 section 4.6.1. // |