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Clarify comment on NetworkProtocolNumber.

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The actual values used for this field in Netstack are actually EtherType values
of the protocol in an Ethernet frame. Eg. header.IPv4ProtocolNumber is 0x0800
and not the number of the IPv4 Protocol Number itself which is 4. Similarly
header.IPv6ProtocolNumber is set to 0x86DD whereas the IPv6 protocol number is
41.

See:
  - https://www.iana.org/assignments/ieee-802-numbers/ieee-802-numbers.xhtml (For EtherType)
  - https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml (For ProtocolNumbers)
PiperOrigin-RevId: 328407293
This commit is contained in:
Bhasker Hariharan
2020-08-25 14:47:08 -07:00
committed by gVisor bot
parent e650890299
commit 1f0d23c7ad
1 changed files with 4 additions and 1 deletions
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pkg/tcpip/tcpip.go
+4 -1
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@@ -1029,7 +1029,10 @@ func (r Route) String() string {
// TransportProtocolNumber is the number of a transport protocol.
type TransportProtocolNumber uint32
// NetworkProtocolNumber is the number of a network protocol.
// NetworkProtocolNumber is the EtherType of a network protocol in an Ethernet
// frame.
//
// See: https://www.iana.org/assignments/ieee-802-numbers/ieee-802-numbers.xhtml
type NetworkProtocolNumber uint32
// A StatCounter keeps track of a statistic.