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+# SPDX-License-Identifier: GPL-2.0-only
+#
+# XFRM configuration
+#
+config XFRM
+ bool
+ depends on INET
+ select GRO_CELLS
+ select SKB_EXTENSIONS
+
+config XFRM_OFFLOAD
+ bool
+
+config XFRM_ALGO
+ tristate
+ select XFRM
+ select CRYPTO
+ select CRYPTO_HASH
+ select CRYPTO_SKCIPHER
+
+if INET
+config XFRM_USER
+ tristate "Transformation user configuration interface"
+ select XFRM_ALGO
+ help
+ Support for Transformation(XFRM) user configuration interface
+ like IPsec used by native Linux tools.
+
+ If unsure, say Y.
+
+config XFRM_USER_COMPAT
+ tristate "Compatible ABI support"
+ depends on XFRM_USER && COMPAT_FOR_U64_ALIGNMENT && \
+ HAVE_EFFICIENT_UNALIGNED_ACCESS
+ select WANT_COMPAT_NETLINK_MESSAGES
+ help
+ Transformation(XFRM) user configuration interface like IPsec
+ used by compatible Linux applications.
+
+ If unsure, say N.
+
+config XFRM_INTERFACE
+ tristate "Transformation virtual interface"
+ depends on XFRM && IPV6
+ help
+ This provides a virtual interface to route IPsec traffic.
+
+ If unsure, say N.
+
+config XFRM_SUB_POLICY
+ bool "Transformation sub policy support"
+ depends on XFRM
+ 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 XFRM_MIGRATE
+ bool "Transformation migrate database"
+ depends on XFRM
+ help
+ A feature to update locator(s) of a given IPsec security
+ association dynamically. This feature is required, for
+ instance, in a Mobile IPv6 environment with IPsec configuration
+ where mobile nodes change their attachment point to the Internet.
+
+ If unsure, say N.
+
+config XFRM_STATISTICS
+ bool "Transformation statistics"
+ depends on XFRM && PROC_FS
+ help
+ This statistics is not a SNMP/MIB specification but shows
+ statistics about transformation error (or almost error) factor
+ at packet processing for developer.
+
+ If unsure, say N.
+
+# This option selects XFRM_ALGO along with the AH authentication algorithms that
+# RFC 8221 lists as MUST be implemented.
+config XFRM_AH
+ tristate
+ select XFRM_ALGO
+ select CRYPTO
+ select CRYPTO_HMAC
+ select CRYPTO_SHA256
+
+# This option selects XFRM_ALGO along with the ESP encryption and authentication
+# algorithms that RFC 8221 lists as MUST be implemented.
+config XFRM_ESP
+ tristate
+ select XFRM_ALGO
+ select CRYPTO
+ select CRYPTO_AES
+ select CRYPTO_AUTHENC
+ select CRYPTO_CBC
+ select CRYPTO_ECHAINIV
+ select CRYPTO_GCM
+ select CRYPTO_HMAC
+ select CRYPTO_SEQIV
+ select CRYPTO_SHA256
+
+config XFRM_IPCOMP
+ tristate
+ select XFRM_ALGO
+ select CRYPTO
+ select CRYPTO_DEFLATE
+
+config NET_KEY
+ tristate "PF_KEY sockets"
+ select XFRM_ALGO
+ 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.
+
+config NET_KEY_MIGRATE
+ bool "PF_KEY MIGRATE"
+ depends on NET_KEY
+ select XFRM_MIGRATE
+ help
+ Add a PF_KEY MIGRATE message to PF_KEYv2 socket family.
+ The PF_KEY MIGRATE message is used to dynamically update
+ locator(s) of a given IPsec security association.
+ This feature is required, for instance, in a Mobile IPv6
+ environment with IPsec configuration where mobile nodes
+ change their attachment point to the Internet. Detail
+ information can be found in the internet-draft
+ <draft-sugimoto-mip6-pfkey-migrate>.
+
+ If unsure, say N.
+
+config XFRM_ESPINTCP
+ bool
+
+endif # INET