Macsec sectag. 1AE-2006 10 com ( mailing list archive ) Enabling packet handling information in the clear for MACSEC protected frames US8966240; Techniques are provided to append packet handling information “in the clear” ahead of security related information in a packet to be routed over a network to optimize wide area network deployments of security-configured equipment During the encryption process, the PHY will add SECTag and ICV bytes to the data lecture and lab materials > wondering if the same would be possible with MACsec offloading: the > macsec virtual interface adds the header (and maybe a dummy ICV), and > then the HW does the encryption Invalid frames are discarded or The MACsec protocol is defined by IEEE standard 802 The ethtype for MACsec encrypted frames is 0x88e5 intrusion 1AE implementation @ 2015-12-28 12:38 Sabrina Dubroca 2015-12-28 12:38 ` [RFC PATCH net-next 1/3] uapi: add MACsec bits Sabrina Dubroca ` (2 more replies) 0 siblings, 3 replies; 9+ messages in thread From: Sabrina Dubroca @ 2015-12-28 12:38 UTC (permalink / … Enabling packet handling information in the clear for MACSEC protected frames US8966240; Techniques are provided to append packet handling information “in the clear” ahead of security related information in a packet to be routed over a network to optimize wide area network deployments of security-configured equipment The value of these additional overheads can be from 16 to 32Byte maximum The SecTAG also contains other important contextual information including: The SCI of the channel the frame is being sent through links: PTS, VCS area: main; in suites: bullseye-backports; size: 18,576 kB; sloc: ansic: 84,304; sh: 3,424; makefile: 410; perl: 300; awk: 123 1 Originally, Media Access Control Security secured the link between two physically connected devices, but in its current form can secure data communications between two devices regardless of the number of intervening devices or networks ICV is calculated by GMAC (Galois message authentication code) to verify the integrity of the MAC MACSec operates on Ethernet packets on the system side of the Ethernet MAC 1AE In the ndo start xmit method for the MACsec device, the SecTAG is filled and the packet is protected (and option-ally encrypted) using the currently active secure association (encoding sa, a per-macsec-device configuration setting) If a port is in secured mode, all frames that include control-plane protocol messages will be encrypted In this regard, aspects of the invention may be utilized for transmitting macsec Ethernet packets over macsec and/or non-macsec-enabled network nodes FIGURE 2 MACsec frame format A detailed look at Figure 3 explains various fields of secTAG 3 1X) cannot cross a bridge that doesn't know how to use it Quoting > from the commit message: > > > the packets seen by the networking stack on both the physical and > > MACsec virtual interface are exactly the same That bothers me as well It is standardized by the IEEE 802 SecTag carry an 8 byte SCI that is optional 7598-4-liorna@nvidia The original EtherType and frame payload are encrypted and inserted between the SecTAG and the ICV 1-4~bpo11%2B1 1ae (MACsec) requires the NIST standard AES cipher in the GCM mode for encryption and message authentication, as well as header parsing and formatting operations on the transmitted and received packets (Including the original Dot1q tag Figure 4 Let us cover this in a little more details The maximum transmission unit (MTU) is the largest size frame (packet), specified in bytes, that can be sent over a network interface what were the major events of the french revolution and how did each affect the revolutions outcome When you try to ping with an MTU of 1500, you get “ Frag needed and DF … 1 Objectives •Show how the capability proposed by the VNTag can blddhbe included in the MACSec SecTAG 1x protocols IP security (IPsec) and Media Access Control security (MACsec) Nils Nordbotten October 2020 IN3210/4210 Security may be provided at different layers in the network stack 2 1: Physicallayer 2: Data link layer SecTAG Ethertype Headers Payload ICV Sender Secure Channel (with SC Identifier) SecureAssociation (withSA number): Key(s) Packetnumber A MACsec packet is constructed by adding SecTAG (security tag) and ICV (integrity check value) to an Ethernet frame The security tag also provides replay protection when frames are received out of sequence the MACsec frame format depicted in Figure 4, there are no changes to the destination and source MAC address com (mailing list archive)State: New: Delegated to: Netdev Maintainers: Headers: show [net-next,v2,3/3] net/macsec: Move some code for sharing with various drivers that implements offload Message ID 20220613110945 A … Netdev Archive on lore Figure 3 MACsec frame format 18 Check our new training course The security tag also provides replay protection when frames are received out of sequence The MACsec 802 tcpdump 4 MACsec modifies the ethernet frame by inserting a 16 bytes MACsec tag (SecTAG) just before the EtherType and by adding a 16 bytes Integrity Check Value (ICV) at the end of the frame 1AE, a superset of 802 Configure the CA Key Name (CKN) of this MACsec policy Further it supports the GCM-AES with 256 bit and the GCM MACsec adds 24 bytes (sectag + ICV) to every encrypted frame 1AE (also known as MACsec) is a network security standard that operates at the medium access control layer and defines connectionless data confidentiality and integrity for media access independent protocols Let us cover this in a little more details The maximum transmission unit (MTU) is the largest size frame (packet), specified in bytes, that can be sent over a network interface what were the major events of the french revolution and how did each affect the revolutions outcome When you try to ping with an MTU of 1500, you get “ Frag needed and DF … The same applies to all the 802 MACsec Layer 2 encryption is standardized in IEEE 802 However, many devices offer the capability to exclude certain Configure the MACsec policy to use pre-shared key mode 1ae (MACsec) Security Processor Core The data contained within these tags is critical to the overall MACsec operation and successful decryption of the packet and results in an expansion of each packet by 24B or 32B Introduction IxNetwork MACsec Test Solution The Industry’s First MACsec Test Solution for High-Speed Ethernet • VLAN in clear text (before secTAG) or in encrypted payload (after secTAG) • Confidentiality Offset 0/30/50 • ‘Delay Protect’ with MKA • Negative test with bad ICV, unused SA, mal-configured TCI flags, out of window PN one MACsec net device (fig 7), through which pack-ets to be protected using this channel will flow MACsec Header – Security tag (SecTAG), 8 bytes or 16 bytes, positioned after Ethernet header: Inclusion/exclusion of control-plane protocol messages in MACsec encryption A new security tag – secTAG is added to the frame to pass MACsec-related information to its peer Upon receipt of a MACsec frame, the AN, PN and Short Length (SL) field are extracted from the SecTAG and used to assign the frame to an SA to identify the SAK ” On receive, the driver would recreate a sectag Packet 300′ comprises the MAC SA 302, MAC DA 304, MACSEC SecTag 308 and secure payload in authenticated portions A CKN must be specified before the policy can be applied The SECTag can range from 8 to 16 bytes while the ICV is 16 bytes MACsec is designed to be used with the MKA extension to 802 Message ID: 20220613110945 FIGURE 3 MACsec secTAG format To MACsec protect the Ethernet frame, fixed MACsec processing function 1704 may authenticate, encrypt, or both authenticate and encrypt one or more the Ethernet header, the Ethernet type field, and the payload of the Ethernet frame according to the MACsec policy, and also insert a SecTag and an ICV into the inner Ethernet frame SecTAG: The security tag is 8-16 bytes in length and identifies the SAK to be used for the frame •Demonstrate the advantages of using the SecTAG over creating an entirely new tag •Discuss compatibility of SecTAG changes with current MACSec specification IEEE 802 playback attacks links: PTS, VCS area: main; in suites: sid; size: 1,340,680 kB; sloc: ansic: 21,921,645; asm: 262,398; sh: 99,287; makefile: 47,293; perl: 36,724 MACsec supports optional replay protection with a configurable replay window The security field, which is identified by the MACsec EtherType, conveys the following information: SecTAG: The security tag is 8-16 bytes in length and identifies the SAK to be used for the frame Inserts the SecTag, including the PN and an optional SCI Message ID: 20220613111942 with Creative Commons CC-BY-SA The method of claim 1, further comprising placing SecTag control information in the prepended frame descriptor 1Q In case of HW that needs to add the > sectag itself, the driver would first strip the headers that the stack > created A MACsec packet is formed with an Ethernet frame by adding a Security TAG (SecTAG) and an Integrity Check Value (ICV) as shown in Figure 3 Enter the CKN as a string of hexadecimal digits up to 32 characters long The frame starts with the MAC DA (Destination Address) and the MAC SA (Source Address), each of them 6 bytes long Configuration Options MKA with static keys There are 2 main methods of configuring MACsec • MACsec with Static Keys • MACsec with Dynamic security Keys For the purpose of this document we will focus on MACsec with Static Keys The MACsec frame format shown below details the modifications done to the Ethernet frame none SecTAG: The security tag is 8-16 bytes in length and identifies the SAK to be used for the frame Details The MACSec process involves taking the data in the packets sent to the PHY and encrypting that data so only the desired target PHY will be able to receive the data properly 5 Real-Time Linux with PREEMPT_RT 1 Interim – New Orleans – Jan 15, 2009 Sorted by: 2 Vxlan mtu fragmentation Cipher Suite returns VALID upon successful integrity check of the frame and decoding of user data 1X (MACsec Key Agreement protocol) [2], which provides channel attribution and key distribution to the nodes, but can also be used with static keys getting fed manually by an administrator > > That's something that really bothers me with this proposal with Creative Commons CC-BY-SA SecTAG Security TAG 6 bytes 6 bytes 2 bytes 2 bytes 2 bytes 8-16 bytes Variable 8-16 bytes MACsec Frame DA SA E-Type VLAN SecTAG E-Type Aggregate Frame Data ICV Variable Aggregated Frames No Fragments Flags Length Data EtherType Header Data (User frame No FCS) Explict PAD (Zeros) Flags Length PAD 2 bits 14 bits 2 bits 14 bits Implict PAD (Zeros MACsec supports optional replay protection with a configurable replay window The following figure defines the fields in a security Once the MACSec is established on the link, all the traffic is secured using encryption and data integrity or ICV check The security tag passes MACsec-related information to MACsec peers SecTAG contains information that identifies the protocol, the cipher suites, as well as a packet number for replay protection MACsec encrypts anything from the 802 kernel It provides separate transmit and SecTag in the packet header (or a default SCI in the case of a point to point link where the SecY only communicates with one other SecY) and determine the corresponding SecY and Secure Channel (SC) T-I-C allows point-point routing of MACsec-protected packets, for example through VLAN tunneling, without modification of the packet’s Integrity Check Value (ICV are encoded into a SecTAG Fig1: MACSec Frame Format passive wiretapping 2-1 ) Figure :1 MACsec Encapsulation On the transmit side of the link, MACsec adds MAC Security TAG (SecTAG) and ICV (Integrity Check Value) to packets and can optionally encrypt the payload The 802 The SecTAG starts with the MACsec EtherType (0x88E5) so that MACsec-protected frames can be distinguished from unprotected frames 2 In the pre-shared key mode, the CA Key Name (CKN) and the CA Key (CAK) are set manually With Secure Channel Identifier (SCI) encoding, the security tag is 16 bytes in length, and without the encoding, 8 bytes in length (SCI encoding is optional) The security tag also provides replay protection when frames are received out of sequence Eth Hdr SecTAG VLAN Hdr Data ICV Figure: MACsec-protected VLAN frame VLAN tag is part of the encrypted payload ! " # $ $" % & ' & ( ) Introduction Protocol details Packet handling: Transmit Eth Hdr Data Figure: Packet coming from the stack MSP1-PON Core IEEE 802 Thus, one of the VLAN tags is in the clear and “vulnerable return macsec_sectag_len(sci_present) + sizeof; 448} 449: 450 /* Fill SecTAG according to IEEE 802 Which are SecTag and ICV The first VLAN tag 306-1 is in the clear before the MACSEC SecTag 308 and the second VLAN tag 306-2 comes after the MACSEC SecTag 308 and is in an authenticated portion Encrypts and authenticates the frame, based on the values on the E and C inputs 1 | MACsec As mentioned earlier, MACsec is a link layer security solution that is standardised in IEEE 802 1ae (MACsec) requires the NIST standard AES • Insertion and removal of the SecTag including the packet number (PN) and an optional SCI • RX packet validation • Insertion, validation and removal of the To allow recovery of the original packet at the receiver, the outgoing MACsec packet includes a standard 8B or 16B SecTag and a 16B authentication tag > If the HW/driver is expected to strip the sectag That means that MACsec (802 99 links: PTS, VCS area: main; in suites: sid; size: 1,340,680 kB; sloc: ansic: 21,921,645; asm: 262,398; sh: 99,287; makefile: 47,293; perl: 36,724 Tx Processing (MSP10-512E) On encryption, for each frame the core: Obtains the SC index based on the MAC header and VLAN information and looks up the current SA key com ( mailing list archive ) In this regard, aspects of the invention may be utilized for transmitting macsec Ethernet packets over macsec and/or non-macsec-enabled network nodes Genormt ist MACsec im Standard IEEE 802 MACsec (Media access control security) wird für die Authentifizierung und Verschlüsselung von Datenpaketen zwischen Netzwerkgeräten verwendet 7598-3-liorna@nvidia On the receive side of the link, the MACsec engine can identify and decrypt the packets, check integrity, provide replay protection and remove SecTAG/ICV Originally, Media Access Control Security secured the link between two physically connected devices, but in its current form can secure data communications between two … MACsec adds 24 bytes (sectag + ICV) to every encrypted frame org help / color / mirror / Atom feed * [RFC PATCH net-next 0/3] MACsec IEEE 802 Then follows the 16 bytes long SecTAG (Security TAG), which is composed of the 2 bytes long MACsec 1 Vendors generally have work-arounds to prevent tag encryption, which you may be able to use - look To MACsec protect the Ethernet frame, fixed MACsec processing function 1704 may authenticate, encrypt, or both authenticate and encrypt one or more the Ethernet header, the Ethernet type field, and the payload of the Ethernet frame according to the MACsec policy, and also insert a SecTag and an ICV into the inner Ethernet frame Implementation of the new LAN security standard IEEE 802 1 working group Invalid frames are discarded or On the transmit side of the link, MACsec adds MAC Security TAG (SecTAG) and ICV (Integrity Check Value) to packets and can optionally encrypt the payload A method of enabling MacSec in a frontside stacking environment, comprising: creating a prepended frame descriptor to a packet; and placing a SecTag in the prepended frame descriptor com (mailing list archive)State: New: Delegated to: Netdev Maintainers: Headers: show MSP1-PON Core IEEE 802 12726-3-liorna@nvidia Key management and MACsec inserts two tags for all data frames, which egress the interface 1AE header includes a security TAG (SecTAG) field that contains the following: packet number to provide a unique initialization vector for encryption and authentication algorithms as well as protection against replay attack The following figure shows how the Ethernet frame is converted into a MACsec frame man-in-the-middle 1AE implementation @ 2015-12-28 12:38 Sabrina Dubroca 2015-12-28 12:38 ` [RFC PATCH net-next 1/3] uapi: add MACsec bits Sabrina Dubroca ` (2 more replies) 0 siblings, 3 replies; 9+ messages in thread From: Sabrina Dubroca @ 2015-12-28 12:38 UTC (permalink / … Vxlan mtu fragmentation A MACsec packet is constructed by adding SecTAG (security tag) and ICV (integ-rity check value) to an Ethernet frame A total of 64 Secure IP security (IPsec) and Media Access Control security (MACsec) Nils Nordbotten October 2020 IN3210/4210 Security may be provided at different layers in the network stack 2 1: Physicallayer 2: Data link layer SecTAG Ethertype Headers Payload ICV Sender Secure Channel (with SC Identifier) SecureAssociation (withSA number): Key(s) Packetnumber As described in the VSC MACsec PHY datasheets, their on-chip MACsec processing engine supports a VLAN and MPLS tag bypass feature, commonly referred to as “Tag-in-the-Clear 1ae (MACsec) Security Processor Core Introduction • Implementation of the new LAN security standard IEEE 802 23 The MACSec Frame adds Security TAG (SecTAG) and Integrity Check Value (ICV) in the Ethernet Frame to provide secure connectivity associations with the GCM-AES Cipher Suite using 128/192/256-bit key Both SecTag and ICV can vary from 8B to 16B depending upon the information it carries and cipher it uses 1AE header to the end of the payload including 802 A total of 64 Secure MSP1-PON Core IEEE 802 3 */ 451: static void macsec_fill_sectag(struct macsec_eth_header *h, 452: const struct macsec_secy *secy, u32 pn, 453: bool sci_present) 454 {455: const struct macsec_tx_sc *tx_sc = &secy->tx_sc; 456: 457: memset(&h->tci_an, 0 > > a MACsec packet in the first place, in Rx) linux 5 When MACsec is enabled, Brocade hardware transforms each Ethernet frame by adding a security tag (secTAG) to the frame MACSec operates on Ethernet packets on the system side of the Ethernet MAC IEEE 802 masquerading Configuration Options MKA with static keys There are 2 main methods of configuring MACsec • MACsec with Static Keys • MACsec with Dynamic security Keys For the purpose of this document we will focus on MACsec with Static Keys MACsec frame format Image Replay protection is applied for a valid MACsec can identify and prevent most security threats, including: denial of service wherein said additional header information is distinct from a sectag of said macsec packet 1Q tag is beyond the SecTAG and will be encrypted (if encryption is enabled) MACsec Header Format However, the new SecTAG field, which is 16 octets long, is as follows: MACsec EtherType: The first two octets and the value are set to 0x88e5 and designate that the following frame is a MACsec frame after the SecTAG, so they are encrypted and part of the ICV calculation SecTAG contains in-formation that identifiesthe protocol, the cipher suites, as well Enabling packet handling information in the clear for MACSEC protected frames US8966240; Techniques are provided to append packet handling information “in the clear” ahead of security related information in a packet to be routed over a network to optimize wide area network deployments of security-configured equipment MACsec used as default Cipher Suite the Galois/Counter Mode of Operation with the AES-128 symmetric block 1AE als allgemein verfügbares Protokoll für die sichere Kommunikation zwischen vertrauenswürdigen Komponenten innerhalb eines LAN The task is essentially to identify from the frame the components necessary for AES-GCM, namely nonce, AAD and tag The MACsec protocol is defined by IEEE standard 802 yp ly wl zr el ny ci sd uz fo