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Trim link headers from buffer clone when sniffing

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PiperOrigin-RevId: 341135083
This commit is contained in:
Ghanan Gowripalan
2020-11-06 16:01:19 -08:00
committed by gVisor bot
parent 6c93dc970f
commit 5288e19415
1 changed files with 6 additions and 1 deletions
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pkg/tcpip/link/sniffer/sniffer.go
+6 -1
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@@ -205,7 +205,12 @@ func logPacket(prefix string, protocol tcpip.NetworkProtocolNumber, pkt *stack.P
//
// We don't clone the original packet buffer so that the new packet buffer
// does not have any of its headers set.
pkt = stack.NewPacketBuffer(stack.PacketBufferOptions{Data: buffer.NewVectorisedView(pkt.Size(), pkt.Views())})
//
// We trim the link headers from the cloned buffer as the sniffer doesn't
// handle link headers.
vv := buffer.NewVectorisedView(pkt.Size(), pkt.Views())
vv.TrimFront(len(pkt.LinkHeader().View()))
pkt = stack.NewPacketBuffer(stack.PacketBufferOptions{Data: vv})
switch protocol {
case header.IPv4ProtocolNumber:
if ok := parse.IPv4(pkt); !ok {