1 .. SPDX-License-Identifier: BSD-3-Clause
2 Copyright(c) 2018 Intel Corporation.
4 IPsec Packet Processing Library
5 ===============================
7 DPDK provides a library for IPsec data-path processing.
8 The library utilizes the existing DPDK crypto-dev and
9 security API to provide the application with a transparent and
10 high performant IPsec packet processing API.
11 The library is concentrated on data-path protocols processing
12 (ESP and AH), IKE protocol(s) implementation is out of scope
18 This API operates on the IPsec Security Association (SA) level.
19 It provides functionality that allows user for given SA to process
20 inbound and outbound IPsec packets.
24 * for inbound ESP/AH packets perform decryption, authentication, integrity checking, remove ESP/AH related headers
25 * for outbound packets perform payload encryption, attach ICV, update/add IP headers, add ESP/AH headers/trailers,
26 * setup related mbuf fields (ol_flags, tx_offloads, etc.).
27 * initialize/un-initialize given SA based on user provided parameters.
29 The SA level API is based on top of crypto-dev/security API and relies on
30 them to perform actual cipher and integrity checking.
32 Due to the nature of the crypto-dev API (enqueue/dequeue model) the library
33 introduces an asynchronous API for IPsec packets destined to be processed by
36 The expected API call sequence for data-path processing would be:
40 /* enqueue for processing by crypto-device */
41 rte_ipsec_pkt_crypto_prepare(...);
42 rte_cryptodev_enqueue_burst(...);
43 /* dequeue from crypto-device and do final processing (if any) */
44 rte_cryptodev_dequeue_burst(...);
45 rte_ipsec_pkt_crypto_group(...); /* optional */
46 rte_ipsec_pkt_process(...);
48 For packets destined for inline processing no extra overhead
49 is required and the synchronous API call: rte_ipsec_pkt_process()
50 is sufficient for that case.
54 For more details about the IPsec API, please refer to the *DPDK API Reference*.
56 The current implementation supports all four currently defined
59 RTE_SECURITY_ACTION_TYPE_NONE
60 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
62 In that mode the library functions perform
64 * for inbound packets:
67 - prepare *rte_crypto_op* structure for each input packet
68 - verify that integity check and decryption performed by crypto device
69 completed successfully
71 - remove outer IP header (tunnel mode) / update IP header (transport mode)
72 - remove ESP header and trailer, padding, IV and ICV data
73 - update SA replay window
75 * for outbound packets:
78 - add outer IP header (tunnel mode) / update IP header (transport mode)
79 - add ESP header and trailer, padding and IV data
80 - prepare *rte_crypto_op* structure for each input packet
81 - verify that crypto device operations (encryption, ICV generation)
82 were completed successfully
84 RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO
85 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
87 In that mode the library functions perform
89 * for inbound packets:
91 - verify that integity check and decryption performed by *rte_security*
92 device completed successfully
95 - remove outer IP header (tunnel mode) / update IP header (transport mode)
96 - remove ESP header and trailer, padding, IV and ICV data
97 - update SA replay window
99 * for outbound packets:
101 - generate SQN and IV
102 - add outer IP header (tunnel mode) / update IP header (transport mode)
103 - add ESP header and trailer, padding and IV data
104 - update *ol_flags* inside *struct rte_mbuf* to inidicate that
105 inline-crypto processing has to be performed by HW on this packet
106 - invoke *rte_security* device specific *set_pkt_metadata()* to associate
107 secuirty device specific data with the packet
109 RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL
110 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
112 In that mode the library functions perform
114 * for inbound packets:
116 - verify that integity check and decryption performed by *rte_security*
117 device completed successfully
119 * for outbound packets:
121 - update *ol_flags* inside *struct rte_mbuf* to inidicate that
122 inline-crypto processing has to be performed by HW on this packet
123 - invoke *rte_security* device specific *set_pkt_metadata()* to associate
124 secuirty device specific data with the packet
126 RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL
127 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
129 In that mode the library functions perform
131 * for inbound packets:
133 - prepare *rte_crypto_op* structure for each input packet
134 - verify that integity check and decryption performed by crypto device
135 completed successfully
137 * for outbound packets:
139 - prepare *rte_crypto_op* structure for each input packet
140 - verify that crypto device operations (encryption, ICV generation)
141 were completed successfully
143 To accommodate future custom implementations function pointers
144 model is used for both *crypto_prepare* and *process* implementations.
150 * ESP protocol tunnel mode both IPv4/IPv6.
152 * ESP protocol transport mode both IPv4/IPv6.
154 * ESN and replay window.
156 * algorithms: AES-CBC, AES-GCM, HMAC-SHA1, NULL.
162 The following features are not properly supported in the current version:
164 * ESP transport mode for IPv6 packets with extension headers.
165 * Multi-segment packets.
166 * Updates of the fields in inner IP header for tunnel mode
167 (as described in RFC 4301, section 5.1.2).
168 * Hard/soft limit for SA lifetime (time interval/byte count).