diff options
Diffstat (limited to 'pkg/tcpip/link/fdbased/endpoint.go')
| -rw-r--r-- | pkg/tcpip/link/fdbased/endpoint.go | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/pkg/tcpip/link/fdbased/endpoint.go b/pkg/tcpip/link/fdbased/endpoint.go index 9f2084eae..cb94cbea6 100644 --- a/pkg/tcpip/link/fdbased/endpoint.go +++ b/pkg/tcpip/link/fdbased/endpoint.go @@ -284,9 +284,12 @@ func createInboundDispatcher(e *endpoint, fd int, isSocket bool) (linkDispatcher } switch sa.(type) { case *unix.SockaddrLinklayer: - // enable PACKET_FANOUT mode is the underlying socket is - // of type AF_PACKET. - const fanoutType = 0x8000 // PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_DEFRAG + // Enable PACKET_FANOUT mode if the underlying socket is of type + // AF_PACKET. We do not enable PACKET_FANOUT_FLAG_DEFRAG as that will + // prevent gvisor from receiving fragmented packets and the host does the + // reassembly on our behalf before delivering the fragments. This makes it + // hard to test fragmentation reassembly code in Netstack. + const fanoutType = unix.PACKET_FANOUT_HASH fanoutArg := fanoutID | fanoutType<<16 if err := syscall.SetsockoptInt(fd, syscall.SOL_PACKET, unix.PACKET_FANOUT, fanoutArg); err != nil { return nil, fmt.Errorf("failed to enable PACKET_FANOUT option: %v", err) |