MACsec Intel FPGA System Design User Guide

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ID 767516
Date 3/03/2023
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Document Table of Contents
Document Table of Contents x
1. Introduction 2. Architecture 3. Interface Overview 4. Parameters 5. Configuration Registers 6. Software Architecture 7. Generating the System Design 8. Document Revision History for MACsec System Design User Guide
1. Introduction x
1.1. Terminology 1.2. Release Information 1.3. System Requirements
2. Architecture x
2.1. System Architecture 2.2. Data Path Between Ethernet MAC and MACsec 2.3. Data Path Between MACsec and MCDMA 2.4. Data Path Between MACsec and Packet Generator/Checker (Packet Client) 2.5. Data Path Illustrations 2.6. Interrupts 2.7. Packet FIFO 2.8. AXI-ST Rate Controller 2.9. Error Handling 2.10. Top Level Signals
2.2. Data Path Between Ethernet MAC and MACsec x
2.2.1. Ethernet Subsystem
2.2.1. Ethernet Subsystem x
2.2.1.1. Data Receiving from MACsec to E/F-Tile Hard IP 2.2.1.2. Data Transmitting from E/F-tile Hard IP to MACsec 2.2.1.3. Order of Ethernet Transmission 2.2.1.4. E/F-Tile Hard IP Reset Sequence
2.3. Data Path Between MACsec and MCDMA x
2.3.1. AXI-ST Multi-Segment to Single-Segment Conversion 2.3.2. MCDMA
2.4. Data Path Between MACsec and Packet Generator/Checker (Packet Client) x
2.4.1. Packet Client 2.4.2. Packet Generation and Check
2.5. Data Path Illustrations x
2.5.1. MACsec Interface Signal Names
2.6. Interrupts x
2.6.1. MCDMA MSI-X Table Configuration
3. Interface Overview x
3.1. Clocking 3.2. Resets
5. Configuration Registers x
5.1. System Register Map
5.1. System Register Map x
5.1.1. Packet Client Register Map 5.1.2. Interrupt Controller Register Map
6. Software Architecture x
6.1. MACsec Key Agreement Protocol 6.2. Driver Functional Requirements 6.3. Software Requirements 6.4. Software Overview 6.5. MACsec IP APIs Sequence 6.6. Functions 6.7. Software Tools
6.4. Software Overview x
6.4.1. McDMA Driver Kernel Module 6.4.2. MACsec IP APIs 6.4.3. Linux MACsec Driver Kernel Module 6.4.4. IP Tool 6.4.5. WPA Supplicant
6.4.2. MACsec IP APIs x
6.4.2.1. SDK
6.5. MACsec IP APIs Sequence x
6.5.1. MACsec Initialization Sequence
6.5.1. MACsec Initialization Sequence x
6.5.1.1. MACsec Reset Sequence 6.5.1.2. TX Configuration Sequence 6.5.1.3. RX Configuration Sequence 6.5.1.4. TX Rekeying Sequence 6.5.1.5. RX Rekeying Sequence 6.5.1.6. Cut Through/Store Forward Mode 6.5.1.7. User Single/Multi Port Settings 6.5.1.8. Encrypt/Decrypt Port 6.5.1.9. Port Priority 6.5.1.10. Interrupt Generation and Register
6.5.1.1. MACsec Reset Sequence x
6.5.1.1.1. GLOBAL Reset 6.5.1.1.2. PORT Reset 6.5.1.1.3. Secure Association (SA) Reset
6.6. Functions x
6.6.1. macsec_initilize 6.6.2. macsec_get_attributes 6.6.3. macsec_get_sa_attributes 6.6.4. macsec_set_attributes 6.6.5. macsec_set_sa_attributes 6.6.6. macsec_read_register 6.6.7. macsec_write_register 6.6.8. macsec_set_port_configuration 6.6.9. macsec_rate_configuration 6.6.10. macsec_single_or_multi_port 6.6.11. macsec_crypto_mode 6.6.12. macsec_port_priority 6.6.13. macsec_register_isr
6.7. Software Tools x
6.7.1. IP Tool 6.7.2. WPA_Supplicant 6.7.3. CLI Debug Tool
6.7.3. CLI Debug Tool x
6.7.3.1. Functional Requirements 6.7.3.2. Features Overview 6.7.3.3. Design with HOST 6.7.3.4. Netlink Interface 6.7.3.5. SDK 6.7.3.6. Design Overview
7. Generating the System Design x
7.1. Software Requirements 7.2. Obtaining the Reference Design 7.3. Reference Design Directory Structure 7.4. Simulation Command Arguments 7.5. Simulation Test Cases 7.6. Complete Simulation Command 7.7. Simulation Requirements 7.8. Running the Simulation 7.9. Building, Installing, and Running the Software
7.4. Simulation Command Arguments x
7.4.1. Simulation -d Options
1. Introduction
2. Architecture
3. Interface Overview
4. Parameters
5. Configuration Registers
6. Software Architecture
7. Generating the System Design
8. Document Revision History for MACsec System Design User Guide

6.7.2. WPA_Supplicant

Figure 42. WPA_Supplicant on Two Hosts

Wpa_supplicant: It uses a config file that includes pre-shared CAK and CKN keys on both hosts. Two peers achieve mutual authentication via exchanging MKA keys. The MACsec Key Agreement protocol uses EAPoL PDUs to transmit and receive MKPDUs securely among each other.

Secure associations using these keys are configured on both hosts. The wpa_supplicant translates the information derived through MKA and configures the kernel's MACsec implementation.

Kernel: It configures the CSR region, and when traffic is initiated, it sends packets protected by MACsec on the "MACsec0" interface, which is a separate network device dedicated to encrypted traffic.

Steps 3 and 4 (as mentioned in the above diagram) are later repeated (as many times as necessary) while wpa_supplicant keeps running to transition to a new key when the current key expires.

Wpa_supplicant uses the configuration file below: 
ctrl_interfaces=/var/run/wpa_supplicant

eapol_version=3
ap_scan=0
fast_reauth=1

# Example Configuration for MACsec with preshared key
network={
        key_mgmt=NONE
        eapol_flags=0
        macsec_policy=1
        mka_cak=0123456789ABCDEF123456789ABCDEF
        mka_ckn=6162636465666768696A6B6C6D6E6F707172737475767778797A303132333435
        mka_priority=2
        macsec_integ_only=0
        macsec_port=0
        macsec_replay_protect=1
        macsec_replay_window=50
#Newly_added
        macsec_val_frames=2
        mka_cipher_suit="GCM-AES-XPN-256"
        macsec_ssci=0xABCD
        macsec_scb=0
        macsec_es=0
        macsec_send_sci=1
}

Command: ./wpa_supplicant -i ens801f0 -D macsec_linux -c wpa_supplicant_MACsec.conf

Where, -i: Interface to be used; -D: Driver to be used; -c: Config file.

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