vm.h File Reference

Interface for filter execution virtual machine. More...

Macros
#define	ERR_BAD_OP   -1
	Execution failed because of an unknown opcode.
#define	ERR_BAD_ACCESS   -2
	Filter did not match because it tried to access a non existing location in the packet.
#define	ERR_UNKNOWN   -3
	An unknown internal error occurred during the execution.

Typedefs
typedef uint8_t	op_t
	Define opcode type as single byte.

Functions
bool	execute_filter (uint8_t *filter_code, int filter_len, uint8_t *packet_data, int packet_len, int *error_out)
	Executes the specified filter on the given packet. More...

Detailed Description

Interface for filter execution virtual machine.

Function Documentation

bool execute_filter	(	uint8_t *	filter_code,
		int	filter_len,
		uint8_t *	packet_data,
		int	packet_len,
		int *	error_out
	)

Executes the specified filter on the given packet.

Parameters

	filter_code	Points to the filters byte code
	filter_len	Length of the byte code
	packet_data	Points to the packet data to run the filter on
	packet_len	Length of packet data in bytes
[out]	error_out	Error information upon failure during execution

Returns

true, if the filter executed successfully and the result was not zero. false otherwise.