1. An apparatus, comprising: a computer-readable storage medium storing: a first processing rule, wherein the first processing rule comprises rule description information and an instruction set, wherein the rule description information is used to identify the first processing rule, wherein the instruction set comprises at least one action instruction, and wherein the instruction set is used to instruct to perform, according to the action instruction in the instruction set, processing on a data packet corresponding to the first processing rule; a receiver configured to receive rule modification information sent by a controller, wherein the rule modification information comprises rule description match information and action instruction modification information, wherein the rule description match information is used to determine a to-be-modified processing rule, rule description information of the to-be-modified processing rule accords with the rule description match information, and the action instruction modification information is used to instruct to modify an action instruction specified in an instruction set of the to-be-modified processing rule; and a processor, wherein the computer-readable storage medium stores a program to be executed by the processor, the program including instructions for: modifying an action instruction specified in the instruction set of the first processing rule according to the action instruction modification information in response to a determination that the rule description information of the first processing rule accords with the rule description match information.