|  | # | 
|  | # XFRM configuration | 
|  | # | 
|  | config XFRM | 
|  | bool | 
|  | depends on NET | 
|  |  | 
|  | config XFRM_USER | 
|  | tristate "Transformation user configuration interface" | 
|  | depends on INET && XFRM | 
|  | ---help--- | 
|  | Support for Transformation(XFRM) user configuration interface | 
|  | like IPsec used by native Linux tools. | 
|  |  | 
|  | If unsure, say Y. | 
|  |  | 
|  | config XFRM_SUB_POLICY | 
|  | bool "Transformation sub policy support (EXPERIMENTAL)" | 
|  | depends on XFRM && EXPERIMENTAL | 
|  | ---help--- | 
|  | Support sub policy for developers. By using sub policy with main | 
|  | one, two policies can be applied to the same packet at once. | 
|  | Policy which lives shorter time in kernel should be a sub. | 
|  |  | 
|  | If unsure, say N. | 
|  |  | 
|  | config NET_KEY | 
|  | tristate "PF_KEY sockets" | 
|  | select XFRM | 
|  | ---help--- | 
|  | PF_KEYv2 socket family, compatible to KAME ones. | 
|  | They are required if you are going to use IPsec tools ported | 
|  | from KAME. | 
|  |  | 
|  | Say Y unless you know what you are doing. | 
|  |  | 
|  |  |