diff options
Diffstat (limited to 'pkg/tcpip/stack/packet_buffer.go')
| -rw-r--r-- | pkg/tcpip/stack/packet_buffer.go | 33 |
1 files changed, 30 insertions, 3 deletions
diff --git a/pkg/tcpip/stack/packet_buffer.go b/pkg/tcpip/stack/packet_buffer.go index 926df4d7b..1b5da6017 100644 --- a/pkg/tcpip/stack/packet_buffer.go +++ b/pkg/tcpip/stack/packet_buffer.go @@ -24,6 +24,8 @@ import ( // multiple endpoints. Clone() should be called in such cases so that // modifications to the Data field do not affect other copies. type PacketBuffer struct { + _ noCopy + // PacketBufferEntry is used to build an intrusive list of // PacketBuffers. PacketBufferEntry @@ -82,7 +84,32 @@ type PacketBuffer struct { // VectorisedView but does not deep copy the underlying bytes. // // Clone also does not deep copy any of its other fields. -func (pk PacketBuffer) Clone() PacketBuffer { - pk.Data = pk.Data.Clone(nil) - return pk +// +// FIXME(b/153685824): Data gets copied but not other header references. +func (pk *PacketBuffer) Clone() *PacketBuffer { + return &PacketBuffer{ + PacketBufferEntry: pk.PacketBufferEntry, + Data: pk.Data.Clone(nil), + Header: pk.Header, + LinkHeader: pk.LinkHeader, + NetworkHeader: pk.NetworkHeader, + TransportHeader: pk.TransportHeader, + Hash: pk.Hash, + Owner: pk.Owner, + EgressRoute: pk.EgressRoute, + GSOOptions: pk.GSOOptions, + NetworkProtocolNumber: pk.NetworkProtocolNumber, + NatDone: pk.NatDone, + } } + +// noCopy may be embedded into structs which must not be copied +// after the first use. +// +// See https://golang.org/issues/8005#issuecomment-190753527 +// for details. +type noCopy struct{} + +// Lock is a no-op used by -copylocks checker from `go vet`. +func (*noCopy) Lock() {} +func (*noCopy) Unlock() {} |