Method GetSockOpt

pkg/sentry/socket/netstack/netstack.go:627–682

GetSockOpt implements the linux syscall getsockopt(2) for sockets backed by tcpip.Endpoint.

(t *kernel.Task, level, name int, outPtr hostarch.Addr, outLen int)

// GetSockOpt implements the linux syscall getsockopt(2) for sockets backed by
// tcpip.Endpoint.
func (s *sock) GetSockOpt(t *kernel.Task, level, name int, outPtr hostarch.Addr, outLen int) (marshal.Marshallable, *syserr.Error) {
	// TODO(b/78348848): Unlike other socket options, SO_TIMESTAMP is
	// implemented specifically for netstack.Socket rather than
	// commonEndpoint. commonEndpoint should be extended to support socket
	// options where the implementation is not shared, as unix sockets need
	// their own support for SO_TIMESTAMP.
	if level == linux.SOL_SOCKET && name == linux.SO_TIMESTAMP {
		if outLen < sizeOfInt32 {
			return nil, syserr.ErrInvalidArgument
		}
		val := primitive.Int32(0)
		s.readMu.Lock()
		defer s.readMu.Unlock()
		if s.sockOptTimestamp {
			val = 1
		}
		return &val, nil
	}
	if level == linux.SOL_TCP && name == linux.TCP_INQ {
		if outLen < sizeOfInt32 {
			return nil, syserr.ErrInvalidArgument
		}
		val := primitive.Int32(0)
		s.readMu.Lock()
		defer s.readMu.Unlock()
		if s.sockOptInq {
			val = 1
		}
		return &val, nil
	}

	switch level {
	case linux.SOL_SOCKET:
		return GetSockOptSocket(t, s, s.Endpoint, s.family, s.skType, name, outLen)

	case linux.SOL_TCP:
		return s.getSockOptTCP(t, s.Endpoint, name, outLen)

	case linux.SOL_IPV6:
		return s.getSockOptIPv6(t, s.Endpoint, name, outPtr, outLen)

	case linux.SOL_IP:
		return s.getSockOptIP(t, s.Endpoint, name, outPtr, outLen, s.family)

	case linux.SOL_ICMPV6:
		return s.getSockOptICMPv6(t, s.Endpoint, name, outLen)

	case linux.SOL_PACKET:
		return s.getSockOptPacket(t, s.Endpoint, name, outPtr, outLen)
	case linux.SOL_UDP, linux.SOL_RAW:
		// Not supported.
	}

	return nil, syserr.ErrProtocolNotAvailable

}

// SetSockOpt implements the linux syscall setsockopt(2) for sockets backed by