Abstract: Ipsec rules are searched in order from rules containing the most specificity to those containing the least specificity of attributes. The static rules include placeholders for sets of dynamic rules. Dynamic rules are searched only if a placeholder is the first matching rule in the static table. For connection oriented protocols, security rule binding information is stored in association with the connection. This allows the searching of the rules to be performed only when a connection is first established. If a static or dynamic rule is changed during a connection, a search is repeated. For selected connectionless protocols, packets are treated as if they were part of a simulated connection. A pseudo-connection memory block is allocated with the creation of each socket and Ipsec security binding information is stored in the pseudo-connection memory block on a first packet.

Abstract: IPSec rules are searched in an improved manner to reduce processing overhead. For selected connectionless protocols, packets are treated as if they were part of a simulated connection. A pseudo-connection memory block is allocated with the creation of each socket and IPSec security binding information is stored in the pseudo-connection memory block on a first packet. Thereafter, as long as the source address and port in incoming packets on the same socket or destination address and port in outgoing packets on the same socket remain the same, the packets are treated as part of a simulated connection. The security rules are not searched again until the simulated connection terminates or the static rule table is modified. In the preferred embodiment, security binding is made only to the static rule or placeholder.