| IP-MACSEC(8) | Linux | IP-MACSEC(8) |
ip-macsec - MACsec device configuration
ip link add link DEVICE name NAME type macsec [ [ address <lladdr> ] port PORT | sci <u64> ] [ cipher { default | gcm-aes-128 | gcm-aes-256 | gcm-aes-xpn-128 | gcm-aes-xpn-256 } ] [ icvlen ICVLEN ] [ encrypt { on | off } ] [ send_sci { on | off } ] [ end_station { on | off } ] [ scb { on | off } ] [ protect { on | off } ] [ replay { on | off } ] [ window WINDOW ] [ validate { strict | check | disabled } ] [ encodingsa SA ] [ offload { off | phy | mac } ]
ip macsec add DEV tx sa { 0..3 } [
OPTS ] key ID KEY
ip macsec set DEV tx sa { 0..3 } [ OPTS ]
ip macsec del DEV tx sa { 0..3 }
ip macsec add DEV rx SCI [ on
| off ]
ip macsec set DEV rx SCI [ on | off
]
ip macsec del DEV rx SCI
ip macsec add DEV rx SCI sa {
0..3 } [ OPTS ] key ID KEY
ip macsec set DEV rx SCI sa { 0..3 }
[ OPTS ]
ip macsec del DEV rx SCI sa { 0..3
}
ip macsec offload DEV { off | phy | mac }
ip macsec show [ DEV ]
OPTS := [ pn { 1..2^32-1 } | xpn {
1..2^64-1 } ] [ salt SALT ] [ ssci
<u32> ] [ on | off ]
SCI := { sci <u64> | port PORT
address <lladdr> }
PORT := { 1..2^16-1 }
SALT := 96-bit hex string
The ip macsec commands are used to configure transmit secure associations and receive secure channels and their secure associations on a MACsec device created with the ip link add command using the macsec type.
# ip link add link eth0 macsec0 type macsec port 11 encrypt on
# ip macsec add macsec0 tx sa 0 pn 1024 on key 01 81818181818181818181818181818181
# ip macsec add macsec0 rx port 1234 address c6:19:52:8f:e6:a0
# ip macsec add macsec0 rx port 1234 address c6:19:52:8f:e6:a0 sa 0 pn 1 on key 00 82828282828282828282828282828282
# ip macsec show
# ip macsec offload macsec0 phy
# ip link add link eth0 macsec0 type macsec port 11 encrypt on offload mac
# ip link add link eth0 macsec0 type macsec port 11 encrypt on cipher gcm-aes-xpn-128
# ip macsec add macsec0 tx sa 0 xpn 1024 on salt 838383838383838383838383 ssci 123 key 01 81818181818181818181818181818181
# ip macsec add macsec0 rx port 11 address c6:19:52:8f:e6:a0
# ip macsec add macsec0 rx port 11 address c6:19:52:8f:e6:a0 sa 0 xpn 1 on salt 838383838383838383838383 ssci 123 key 00 82828282828282828282828282828282
# ip macsec show
This tool can be used to configure the 802.1AE keys of the interface. Note that 802.1AE uses GCM-AES with a initialization vector (IV) derived from the packet number. The same key must not be used with the same IV more than once. Instead, keys must be frequently regenerated and distributed. This tool is thus mostly for debugging and testing, or in combination with a user-space application that reconfigures the keys. It is wrong to just configure the keys statically and assume them to work indefinitely. The suggested and standardized way for key management is 802.1X-2010, which is implemented by wpa_supplicant.
Passing cipher gcm-aes-xpn-128 or gcm-aes-xpn-256 to ip link add command using the macsec type requires using the keyword 'xpn' instead of 'pn' in addition to providing a salt using the 'salt' keyword and ssci using the 'ssci' keyword when using the ip macsec command.
Sabrina Dubroca <sd@queasysnail.net>
| 07 Mar 2016 | iproute |