Automated rollback of changelist 346565589
PiperOrigin-RevId: 347911316
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@ -36,10 +36,10 @@ const (
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// UDPFields contains the fields of a UDP packet. It is used to describe the
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// fields of a packet that needs to be encoded.
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type UDPFields struct {
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// SrcPort is the "Source Port" field of a UDP packet.
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// SrcPort is the "source port" field of a UDP packet.
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SrcPort uint16
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// DstPort is the "Destination Port" field of a UDP packet.
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// DstPort is the "destination port" field of a UDP packet.
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DstPort uint16
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// Length is the "length" field of a UDP packet.
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@ -64,57 +64,52 @@ const (
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UDPProtocolNumber tcpip.TransportProtocolNumber = 17
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)
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// SourcePort returns the "Source Port" field of the UDP header.
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// SourcePort returns the "source port" field of the udp header.
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func (b UDP) SourcePort() uint16 {
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return binary.BigEndian.Uint16(b[udpSrcPort:])
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}
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// DestinationPort returns the "Destination Port" field of the UDP header.
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// DestinationPort returns the "destination port" field of the udp header.
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func (b UDP) DestinationPort() uint16 {
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return binary.BigEndian.Uint16(b[udpDstPort:])
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}
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// Length returns the "Length" field of the UDP header.
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// Length returns the "length" field of the udp header.
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func (b UDP) Length() uint16 {
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return binary.BigEndian.Uint16(b[udpLength:])
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}
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// Payload returns the data contained in the UDP datagram.
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func (b UDP) Payload() []byte {
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return b[:b.Length()][UDPMinimumSize:]
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return b[UDPMinimumSize:]
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}
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// Checksum returns the "checksum" field of the UDP header.
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// Checksum returns the "checksum" field of the udp header.
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func (b UDP) Checksum() uint16 {
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return binary.BigEndian.Uint16(b[udpChecksum:])
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}
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// SetSourcePort sets the "source port" field of the UDP header.
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// SetSourcePort sets the "source port" field of the udp header.
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func (b UDP) SetSourcePort(port uint16) {
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binary.BigEndian.PutUint16(b[udpSrcPort:], port)
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}
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// SetDestinationPort sets the "destination port" field of the UDP header.
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// SetDestinationPort sets the "destination port" field of the udp header.
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func (b UDP) SetDestinationPort(port uint16) {
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binary.BigEndian.PutUint16(b[udpDstPort:], port)
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}
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// SetChecksum sets the "checksum" field of the UDP header.
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// SetChecksum sets the "checksum" field of the udp header.
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func (b UDP) SetChecksum(checksum uint16) {
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binary.BigEndian.PutUint16(b[udpChecksum:], checksum)
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}
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// SetLength sets the "length" field of the UDP header.
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// SetLength sets the "length" field of the udp header.
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func (b UDP) SetLength(length uint16) {
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binary.BigEndian.PutUint16(b[udpLength:], length)
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}
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// PayloadLength returns the length of the payload following the UDP header.
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func (b UDP) PayloadLength() uint16 {
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return b.Length() - UDPMinimumSize
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}
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// CalculateChecksum calculates the checksum of the UDP packet, given the
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// CalculateChecksum calculates the checksum of the udp packet, given the
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// checksum of the network-layer pseudo-header and the checksum of the payload.
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func (b UDP) CalculateChecksum(partialChecksum uint16) uint16 {
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// Calculate the rest of the checksum.
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@ -58,6 +58,5 @@ go_test(
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"//pkg/tcpip/stack",
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"//pkg/tcpip/transport/icmp",
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"//pkg/waiter",
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"@com_github_google_go_cmp//cmp:go_default_library",
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],
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)
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@ -1259,6 +1259,7 @@ func verifyChecksum(hdr header.UDP, pkt *stack.PacketBuffer) bool {
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// HandlePacket is called by the stack when new packets arrive to this transport
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// endpoint.
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func (e *endpoint) HandlePacket(id stack.TransportEndpointID, pkt *stack.PacketBuffer) {
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// Get the header then trim it from the view.
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hdr := header.UDP(pkt.TransportHeader().View())
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if int(hdr.Length()) > pkt.Data.Size()+header.UDPMinimumSize {
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// Malformed packet.
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@ -1267,10 +1268,6 @@ func (e *endpoint) HandlePacket(id stack.TransportEndpointID, pkt *stack.PacketB
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return
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}
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// TODO(gvisor.dev/issues/5033): We should mirror the Network layer and cap
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// packets at "Parse" instead of when handling a packet.
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pkt.Data.CapLength(int(hdr.PayloadLength()))
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if !verifyChecksum(hdr, pkt) {
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// Checksum Error.
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e.stack.Stats().UDP.ChecksumErrors.Increment()
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@ -1304,7 +1301,7 @@ func (e *endpoint) HandlePacket(id stack.TransportEndpointID, pkt *stack.PacketB
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senderAddress: tcpip.FullAddress{
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NIC: pkt.NICID,
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Addr: id.RemoteAddress,
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Port: hdr.SourcePort(),
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Port: header.UDP(hdr).SourcePort(),
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},
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destinationAddress: tcpip.FullAddress{
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NIC: pkt.NICID,
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@ -22,7 +22,6 @@ import (
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"testing"
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"time"
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"github.com/google/go-cmp/cmp"
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"gvisor.dev/gvisor/pkg/tcpip"
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"gvisor.dev/gvisor/pkg/tcpip/buffer"
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"gvisor.dev/gvisor/pkg/tcpip/checker"
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@ -1915,31 +1914,27 @@ func TestV4UnknownDestination(t *testing.T) {
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icmpPkt := header.ICMPv4(hdr.Payload())
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payloadIPHeader := header.IPv4(icmpPkt.Payload())
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incomingHeaderLength := header.IPv4MinimumSize + header.UDPMinimumSize
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wantPayloadLen := len(payload)
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wantLen := len(payload)
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if tc.largePayload {
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// To work out the data size we need to simulate what the sender would
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// have done. The wanted size is the total available minus the sum of
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// the headers in the UDP AND ICMP packets, given that we know the test
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// had only a minimal IP header but the ICMP sender will have allowed
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// for a maximally sized packet header.
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wantPayloadLen = header.IPv4MinimumProcessableDatagramSize - header.IPv4MaximumHeaderSize - header.ICMPv4MinimumSize - incomingHeaderLength
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wantLen = header.IPv4MinimumProcessableDatagramSize - header.IPv4MaximumHeaderSize - header.ICMPv4MinimumSize - incomingHeaderLength
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}
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// In the case of large payloads the IP packet may be truncated. Update
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// the length field before retrieving the udp datagram payload.
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// Add back the two headers within the payload.
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payloadIPHeader.SetTotalLength(uint16(wantPayloadLen + incomingHeaderLength))
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payloadIPHeader.SetTotalLength(uint16(wantLen + incomingHeaderLength))
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origDgram := header.UDP(payloadIPHeader.Payload())
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wantDgramLen := wantPayloadLen + header.UDPMinimumSize
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if got, want := len(origDgram), wantDgramLen; got != want {
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t.Fatalf("got len(origDgram) = %d, want = %d", got, want)
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if got, want := len(origDgram.Payload()), wantLen; got != want {
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t.Fatalf("unexpected payload length got: %d, want: %d", got, want)
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}
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// Correct UDP length to access payload.
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origDgram.SetLength(uint16(wantDgramLen))
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if got, want := origDgram.Payload(), payload[:wantPayloadLen]; !bytes.Equal(got, want) {
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t.Fatalf("got origDgram.Payload() = %x, want = %x", got, want)
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if got, want := origDgram.Payload(), payload[:wantLen]; !bytes.Equal(got, want) {
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t.Fatalf("unexpected payload got: %d, want: %d", got, want)
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}
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})
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}
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@ -2014,23 +2009,20 @@ func TestV6UnknownDestination(t *testing.T) {
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icmpPkt := header.ICMPv6(hdr.Payload())
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payloadIPHeader := header.IPv6(icmpPkt.Payload())
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wantPayloadLen := len(payload)
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wantLen := len(payload)
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if tc.largePayload {
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wantPayloadLen = header.IPv6MinimumMTU - header.IPv6MinimumSize*2 - header.ICMPv6MinimumSize - header.UDPMinimumSize
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wantLen = header.IPv6MinimumMTU - header.IPv6MinimumSize*2 - header.ICMPv6MinimumSize - header.UDPMinimumSize
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}
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wantDgramLen := wantPayloadLen + header.UDPMinimumSize
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// In case of large payloads the IP packet may be truncated. Update
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// the length field before retrieving the udp datagram payload.
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payloadIPHeader.SetPayloadLength(uint16(wantDgramLen))
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payloadIPHeader.SetPayloadLength(uint16(wantLen + header.UDPMinimumSize))
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origDgram := header.UDP(payloadIPHeader.Payload())
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if got, want := len(origDgram), wantPayloadLen+header.UDPMinimumSize; got != want {
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t.Fatalf("got len(origDgram) = %d, want = %d", got, want)
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if got, want := len(origDgram.Payload()), wantLen; got != want {
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t.Fatalf("unexpected payload length got: %d, want: %d", got, want)
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}
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// Correct UDP length to access payload.
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origDgram.SetLength(uint16(wantPayloadLen + header.UDPMinimumSize))
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if diff := cmp.Diff(payload[:wantPayloadLen], origDgram.Payload()); diff != "" {
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t.Fatalf("origDgram.Payload() mismatch (-want +got):\n%s", diff)
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if got, want := origDgram.Payload(), payload[:wantLen]; !bytes.Equal(got, want) {
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t.Fatalf("unexpected payload got: %v, want: %v", got, want)
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}
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})
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}
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@ -2543,67 +2535,3 @@ func TestOutgoingSubnetBroadcast(t *testing.T) {
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})
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}
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}
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func TestReceiveShortLength(t *testing.T) {
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flows := []testFlow{unicastV4, unicastV6}
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for _, flow := range flows {
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t.Run(flow.String(), func(t *testing.T) {
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c := newDualTestContext(t, defaultMTU)
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defer c.cleanup()
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c.createEndpointForFlow(flow)
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// Bind to wildcard.
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bindAddr := tcpip.FullAddress{Port: stackPort}
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if err := c.ep.Bind(bindAddr); err != nil {
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c.t.Fatalf("c.ep.Bind(%#v): %s", bindAddr, err)
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}
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payload := newPayload()
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extraBytes := []byte{1, 2, 3, 4}
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h := flow.header4Tuple(incoming)
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var buf buffer.View
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var proto tcpip.NetworkProtocolNumber
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// Build packets with extra bytes not accounted for in the UDP length
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// field.
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var udp header.UDP
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if flow.isV4() {
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buf = c.buildV4Packet(payload, &h)
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buf = append(buf, extraBytes...)
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ip := header.IPv4(buf)
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ip.SetTotalLength(ip.TotalLength() + uint16(len(extraBytes)))
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ip.SetChecksum(0)
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ip.SetChecksum(^ip.CalculateChecksum())
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proto = ipv4.ProtocolNumber
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udp = ip.Payload()
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} else {
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buf = c.buildV6Packet(payload, &h)
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buf = append(buf, extraBytes...)
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ip := header.IPv6(buf)
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ip.SetPayloadLength(ip.PayloadLength() + uint16(len(extraBytes)))
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proto = ipv6.ProtocolNumber
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udp = ip.Payload()
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}
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if diff := cmp.Diff(payload, udp.Payload()); diff != "" {
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t.Errorf("udp.Payload() mismatch (-want +got):\n%s", diff)
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}
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c.linkEP.InjectInbound(proto, stack.NewPacketBuffer(stack.PacketBufferOptions{
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Data: buf.ToVectorisedView(),
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}))
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// Try to receive the data.
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v, _, err := c.ep.Read(nil)
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if err != nil {
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t.Fatalf("c.ep.Read(nil): %s", err)
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}
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// Check the payload is read back without extra bytes.
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if diff := cmp.Diff(buffer.View(payload), v); diff != "" {
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t.Errorf("c.ep.Read(nil) mismatch (-want +got):\n%s", diff)
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}
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})
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}
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}
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