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authorAkhil Goyal <akhil.goyal@nxp.com>2017-10-25 20:37:24 +0530
committerThomas Monjalon <thomas@monjalon.net>2017-10-26 03:11:06 +0200
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doc: add details of security library
Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com> Signed-off-by: Akhil Goyal <akhil.goyal@nxp.com> Acked-by: John McNamara <john.mcnamara@intel.com>
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+.. BSD LICENSE
+ Copyright 2017 NXP.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name of NXP nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+Security Library
+================
+
+The security library provides a framework for management and provisioning
+of security protocol operations offloaded to hardware based devices. The
+library defines generic APIs to create and free security sessions which can
+support full protocol offload as well as inline crypto operation with
+NIC or crypto devices. The framework currently only supports the IPSec protocol
+and associated operations, other protocols will be added in future.
+
+Design Principles
+-----------------
+
+The security library provides an additional offload capability to an existing
+crypto device and/or ethernet device.
+
+.. code-block:: console
+
+ +---------------+
+ | rte_security |
+ +---------------+
+ \ /
+ +-----------+ +--------------+
+ | NIC PMD | | CRYPTO PMD |
+ +-----------+ +--------------+
+
+.. note::
+
+ Currently, the security library does not support the case of multi-process.
+ It will be updated in the future releases.
+
+The supported offload types are explained in the sections below.
+
+Inline Crypto
+~~~~~~~~~~~~~
+
+RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO:
+The crypto processing for security protocol (e.g. IPSec) is processed
+inline during receive and transmission on NIC port. The flow based
+security action should be configured on the port.
+
+Ingress Data path - The packet is decrypted in RX path and relevant
+crypto status is set in Rx descriptors. After the successful inline
+crypto processing the packet is presented to host as a regular Rx packet
+however all security protocol related headers are still attached to the
+packet. e.g. In case of IPSec, the IPSec tunnel headers (if any),
+ESP/AH headers will remain in the packet but the received packet
+contains the decrypted data where the encrypted data was when the packet
+arrived. The driver Rx path check the descriptors and and based on the
+crypto status sets additional flags in the rte_mbuf.ol_flags field.
+
+.. note::
+
+ The underlying device may not support crypto processing for all ingress packet
+ matching to a particular flow (e.g. fragmented packets), such packets will
+ be passed as encrypted packets. It is the responsibility of application to
+ process such encrypted packets using other crypto driver instance.
+
+Egress Data path - The software prepares the egress packet by adding
+relevant security protocol headers. Only the data will not be
+encrypted by the software. The driver will accordingly configure the
+tx descriptors. The hardware device will encrypt the data before sending the
+the packet out.
+
+.. note::
+
+ The underlying device may support post encryption TSO.
+
+.. code-block:: console
+
+ Egress Data Path
+ |
+ +--------|--------+
+ | egress IPsec |
+ | | |
+ | +------V------+ |
+ | | SADB lookup | |
+ | +------|------+ |
+ | +------V------+ |
+ | | Tunnel | | <------ Add tunnel header to packet
+ | +------|------+ |
+ | +------V------+ |
+ | | ESP | | <------ Add ESP header without trailer to packet
+ | | | | <------ Mark packet to be offloaded, add trailer
+ | +------|------+ | meta-data to mbuf
+ +--------V--------+
+ |
+ +--------V--------+
+ | L2 Stack |
+ +--------|--------+
+ |
+ +--------V--------+
+ | |
+ | NIC PMD | <------ Set hw context for inline crypto offload
+ | |
+ +--------|--------+
+ |
+ +--------|--------+
+ | HW ACCELERATED | <------ Packet Encryption and
+ | NIC | Authentication happens inline
+ | |
+ +-----------------+
+
+
+Inline protocol offload
+~~~~~~~~~~~~~~~~~~~~~~~
+
+RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL:
+The crypto and protocol processing for security protocol (e.g. IPSec)
+is processed inline during receive and transmission. The flow based
+security action should be configured on the port.
+
+Ingress Data path - The packet is decrypted in the RX path and relevant
+crypto status is set in the Rx descriptors. After the successful inline
+crypto processing the packet is presented to the host as a regular Rx packet
+but all security protocol related headers are optionally removed from the
+packet. e.g. in the case of IPSec, the IPSec tunnel headers (if any),
+ESP/AH headers will be removed from the packet and the received packet
+will contains the decrypted packet only. The driver Rx path checks the
+descriptors and based on the crypto status sets additional flags in
+``rte_mbuf.ol_flags`` field.
+
+.. note::
+
+ The underlying device in this case is stateful. It is expected that
+ the device shall support crypto processing for all kind of packets matching
+ to a given flow, this includes fragmented packets (post reassembly).
+ E.g. in case of IPSec the device may internally manage anti-replay etc.
+ It will provide a configuration option for anti-replay behavior i.e. to drop
+ the packets or pass them to driver with error flags set in the descriptor.
+
+Egress Data path - The software will send the plain packet without any
+security protocol headers added to the packet. The driver will configure
+the security index and other requirement in tx descriptors.
+The hardware device will do security processing on the packet that includes
+adding the relevant protocol headers and encrypting the data before sending
+the packet out. The software should make sure that the buffer
+has required head room and tail room for any protocol header addition. The
+software may also do early fragmentation if the resultant packet is expected
+to cross the MTU size.
+
+
+.. note::
+
+ The underlying device will manage state information required for egress
+ processing. E.g. in case of IPSec, the seq number will be added to the
+ packet, however the device shall provide indication when the sequence number
+ is about to overflow. The underlying device may support post encryption TSO.
+
+.. code-block:: console
+
+ Egress Data Path
+ |
+ +--------|--------+
+ | egress IPsec |
+ | | |
+ | +------V------+ |
+ | | SADB lookup | |
+ | +------|------+ |
+ | +------V------+ |
+ | | Desc | | <------ Mark packet to be offloaded
+ | +------|------+ |
+ +--------V--------+
+ |
+ +--------V--------+
+ | L2 Stack |
+ +--------|--------+
+ |
+ +--------V--------+
+ | |
+ | NIC PMD | <------ Set hw context for inline crypto offload
+ | |
+ +--------|--------+
+ |
+ +--------|--------+
+ | HW ACCELERATED | <------ Add tunnel, ESP header etc header to
+ | NIC | packet. Packet Encryption and
+ | | Authentication happens inline.
+ +-----------------+
+
+
+Lookaside protocol offload
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL:
+This extends librte_cryptodev to support the programming of IPsec
+Security Association (SA) as part of a crypto session creation including
+the definition. In addition to standard crypto processing, as defined by
+the cryptodev, the security protocol processing is also offloaded to the
+crypto device.
+
+Decryption: The packet is sent to the crypto device for security
+protocol processing. The device will decrypt the packet and it will also
+optionally remove additional security headers from the packet.
+E.g. in case of IPSec, IPSec tunnel headers (if any), ESP/AH headers
+will be removed from the packet and the decrypted packet may contain
+plain data only.
+
+.. note::
+
+ In case of IPSec the device may internally manage anti-replay etc.
+ It will provide a configuration option for anti-replay behavior i.e. to drop
+ the packets or pass them to driver with error flags set in descriptor.
+
+Encryption: The software will submit the packet to cryptodev as usual
+for encryption, the hardware device in this case will also add the relevant
+security protocol header along with encrypting the packet. The software
+should make sure that the buffer has required head room and tail room
+for any protocol header addition.
+
+.. note::
+
+ In the case of IPSec, the seq number will be added to the packet,
+ It shall provide an indication when the sequence number is about to
+ overflow.
+
+.. code-block:: console
+
+ Egress Data Path
+ |
+ +--------|--------+
+ | egress IPsec |
+ | | |
+ | +------V------+ |
+ | | SADB lookup | | <------ SA maps to cryptodev session
+ | +------|------+ |
+ | +------|------+ |
+ | | \--------------------\
+ | | Crypto | | | <- Crypto processing through
+ | | /----------------\ | inline crypto PMD
+ | +------|------+ | | |
+ +--------V--------+ | |
+ | | |
+ +--------V--------+ | | create <-- SA is added to hw
+ | L2 Stack | | | inline using existing create
+ +--------|--------+ | | session sym session APIs
+ | | | |
+ +--------V--------+ +---|---|----V---+
+ | | | \---/ | | <--- Add tunnel, ESP header etc
+ | NIC PMD | | INLINE | | header to packet.Packet
+ | | | CRYPTO PMD | | Encryption/Decryption and
+ +--------|--------+ +----------------+ Authentication happens
+ | inline.
+ +--------|--------+
+ | NIC |
+ +--------|--------+
+ V
+
+Device Features and Capabilities
+---------------------------------
+
+Device Capabilities For Security Operations
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The device (crypto or ethernet) capabilities which support security operations,
+are defined by the security action type, security protocol, protocol
+capabilities and corresponding crypto capabilities for security. For the full
+scope of the Security capability see definition of rte_security_capability
+structure in the *DPDK API Reference*.
+
+.. code-block:: c
+
+ struct rte_security_capability;
+
+Each driver (crypto or ethernet) defines its own private array of capabilities
+for the operations it supports. Below is an example of the capabilities for a
+PMD which supports the IPSec protocol.
+
+.. code-block:: c
+
+ static const struct rte_security_capability pmd_security_capabilities[] = {
+ { /* IPsec Lookaside Protocol offload ESP Tunnel Egress */
+ .action = RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL,
+ .protocol = RTE_SECURITY_PROTOCOL_IPSEC,
+ .ipsec = {
+ .proto = RTE_SECURITY_IPSEC_SA_PROTO_ESP,
+ .mode = RTE_SECURITY_IPSEC_SA_MODE_TUNNEL,
+ .direction = RTE_SECURITY_IPSEC_SA_DIR_EGRESS,
+ .options = { 0 }
+ },
+ .crypto_capabilities = pmd_capabilities
+ },
+ { /* IPsec Lookaside Protocol offload ESP Tunnel Ingress */
+ .action = RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL,
+ .protocol = RTE_SECURITY_PROTOCOL_IPSEC,
+ .ipsec = {
+ .proto = RTE_SECURITY_IPSEC_SA_PROTO_ESP,
+ .mode = RTE_SECURITY_IPSEC_SA_MODE_TUNNEL,
+ .direction = RTE_SECURITY_IPSEC_SA_DIR_INGRESS,
+ .options = { 0 }
+ },
+ .crypto_capabilities = pmd_capabilities
+ },
+ {
+ .action = RTE_SECURITY_ACTION_TYPE_NONE
+ }
+ };
+ static const struct rte_cryptodev_capabilities pmd_capabilities[] = {
+ { /* SHA1 HMAC */
+ .op = RTE_CRYPTO_OP_TYPE_SYMMETRIC,
+ .sym = {
+ .xform_type = RTE_CRYPTO_SYM_XFORM_AUTH,
+ .auth = {
+ .algo = RTE_CRYPTO_AUTH_SHA1_HMAC,
+ .block_size = 64,
+ .key_size = {
+ .min = 64,
+ .max = 64,
+ .increment = 0
+ },
+ .digest_size = {
+ .min = 12,
+ .max = 12,
+ .increment = 0
+ },
+ .aad_size = { 0 },
+ .iv_size = { 0 }
+ }
+ }
+ },
+ { /* AES CBC */
+ .op = RTE_CRYPTO_OP_TYPE_SYMMETRIC,
+ .sym = {
+ .xform_type = RTE_CRYPTO_SYM_XFORM_CIPHER,
+ .cipher = {
+ .algo = RTE_CRYPTO_CIPHER_AES_CBC,
+ .block_size = 16,
+ .key_size = {
+ .min = 16,
+ .max = 32,
+ .increment = 8
+ },
+ .iv_size = {
+ .min = 16,
+ .max = 16,
+ .increment = 0
+ }
+ }
+ }
+ }
+ }
+
+
+Capabilities Discovery
+~~~~~~~~~~~~~~~~~~~~~~
+
+Discovering the features and capabilities of a driver (crypto/ethernet)
+is achieved through the ``rte_security_capabilities_get()`` function.
+
+.. code-block:: c
+
+ const struct rte_security_capability *rte_security_capabilities_get(uint16_t id);
+
+This allows the user to query a specific driver and get all device
+security capabilities. It returns an array of ``rte_security_capability`` structures
+which contains all the capabilities for that device.
+
+Security Session Create/Free
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Security Sessions are created to store the immutable fields of a particular Security
+Association for a particular protocol which is defined by a security session
+configuration structure which is used in the operation processing of a packet flow.
+Sessions are used to manage protocol specific information as well as crypto parameters.
+Security sessions cache this immutable data in a optimal way for the underlying PMD
+and this allows further acceleration of the offload of Crypto workloads.
+
+The Security framework provides APIs to create and free sessions for crypto/ethernet
+devices, where sessions are mempool objects. It is the application's responsibility
+to create and manage the session mempools. The mempool object size should be able to
+accommodate the driver's private data of security session.
+
+Once the session mempools have been created, ``rte_security_session_create()``
+is used to allocate and initialize a session for the required crypto/ethernet device.
+
+Session APIs need a parameter ``rte_security_ctx`` to identify the crypto/ethernet
+security ops. This parameter can be retrieved using the APIs
+``rte_cryptodev_get_sec_ctx()`` (for crypto device) or ``rte_eth_dev_get_sec_ctx``
+(for ethernet port).
+
+Sessions already created can be updated with ``rte_security_session_update()``.
+
+When a session is no longer used, the user must call ``rte_security_session_destroy()``
+to free the driver private session data and return the memory back to the mempool.
+
+For look aside protocol offload to hardware crypto device, the ``rte_crypto_op``
+created by the application is attached to the security session by the API
+``rte_security_attach_session()``.
+
+For Inline Crypto and Inline protocol offload, device specific defined metadata is
+updated in the mbuf using ``rte_security_set_pkt_metadata()`` if
+``DEV_TX_OFFLOAD_SEC_NEED_MDATA`` is set.
+
+Security session configuration
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Security Session configuration structure is defined as ``rte_security_session_conf``
+
+.. code-block:: c
+
+ struct rte_security_session_conf {
+ enum rte_security_session_action_type action_type;
+ /**< Type of action to be performed on the session */
+ enum rte_security_session_protocol protocol;
+ /**< Security protocol to be configured */
+ union {
+ struct rte_security_ipsec_xform ipsec;
+ struct rte_security_macsec_xform macsec;
+ };
+ /**< Configuration parameters for security session */
+ struct rte_crypto_sym_xform *crypto_xform;
+ /**< Security Session Crypto Transformations */
+ };
+
+The configuration structure reuses the ``rte_crypto_sym_xform`` struct for crypto related
+configuration. The ``rte_security_session_action_type`` struct is used to specify whether the
+session is configured for Lookaside Protocol offload or Inline Crypto or Inline Protocol
+Offload.
+
+.. code-block:: c
+
+ enum rte_security_session_action_type {
+ RTE_SECURITY_ACTION_TYPE_NONE,
+ /**< No security actions */
+ RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO,
+ /**< Crypto processing for security protocol is processed inline
+ * during transmission */
+ RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL,
+ /**< All security protocol processing is performed inline during
+ * transmission */
+ RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL
+ /**< All security protocol processing including crypto is performed
+ * on a lookaside accelerator */
+ };
+
+The ``rte_security_session_protocol`` is defined as
+
+.. code-block:: c
+
+ enum rte_security_session_protocol {
+ RTE_SECURITY_PROTOCOL_IPSEC,
+ /**< IPsec Protocol */
+ RTE_SECURITY_PROTOCOL_MACSEC,
+ /**< MACSec Protocol */
+ };
+
+Currently the library defines configuration parameters for IPSec only. For other
+protocols like MACSec, structures and enums are defined as place holders which
+will be updated in the future.
+
+IPsec related configuration parameters are defined in ``rte_security_ipsec_xform``
+
+.. code-block:: c
+
+ struct rte_security_ipsec_xform {
+ uint32_t spi;
+ /**< SA security parameter index */
+ uint32_t salt;
+ /**< SA salt */
+ struct rte_security_ipsec_sa_options options;
+ /**< various SA options */
+ enum rte_security_ipsec_sa_direction direction;
+ /**< IPSec SA Direction - Egress/Ingress */
+ enum rte_security_ipsec_sa_protocol proto;
+ /**< IPsec SA Protocol - AH/ESP */
+ enum rte_security_ipsec_sa_mode mode;
+ /**< IPsec SA Mode - transport/tunnel */
+ struct rte_security_ipsec_tunnel_param tunnel;
+ /**< Tunnel parameters, NULL for transport mode */
+ };
+
+
+Security API
+~~~~~~~~~~~~
+
+The rte_security Library API is described in the *DPDK API Reference* document.
+
+Flow based Security Session
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+In the case of NIC based offloads, the security session specified in the
+'rte_flow_action_security' must be created on the same port as the
+flow action that is being specified.
+
+The ingress/egress flow attribute should match that specified in the security
+session if the security session supports the definition of the direction.
+
+Multiple flows can be configured to use the same security session. For
+example if the security session specifies an egress IPsec SA, then multiple
+flows can be specified to that SA. In the case of an ingress IPsec SA then
+it is only valid to have a single flow to map to that security session.
+
+.. code-block:: console
+
+ Configuration Path
+ |
+ +--------|--------+
+ | Add/Remove |
+ | IPsec SA | <------ Build security flow action of
+ | | | ipsec transform
+ |--------|--------|
+ |
+ +--------V--------+
+ | Flow API |
+ +--------|--------+
+ |
+ +--------V--------+
+ | |
+ | NIC PMD | <------ Add/Remove SA to/from hw context
+ | |
+ +--------|--------+
+ |
+ +--------|--------+
+ | HW ACCELERATED |
+ | NIC |
+ | |
+ +--------|--------+
+
+* Add/Delete SA flow:
+ To add a new inline SA construct a rte_flow_item for Ethernet + IP + ESP
+ using the SA selectors and the ``rte_crypto_ipsec_xform`` as the ``rte_flow_action``.
+ Note that any rte_flow_items may be empty, which means it is not checked.
+
+.. code-block:: console
+
+ In its most basic form, IPsec flow specification is as follows:
+ +-------+ +----------+ +--------+ +-----+
+ | Eth | -> | IP4/6 | -> | ESP | -> | END |
+ +-------+ +----------+ +--------+ +-----+
+
+ However, the API can represent, IPsec crypto offload with any encapsulation:
+ +-------+ +--------+ +-----+
+ | Eth | -> ... -> | ESP | -> | END |
+ +-------+ +--------+ +-----+