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ICMPv6: Recognise ND option 14 (Nonce) #1108

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ICMPv6: Recognise ND option 14 (Nonce) #1108

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Commits on Mar 2, 2024

  1. ICMPv6: Recognise ND option 14 (Nonce) 

    This option has been observed to be included in neighbour solicitations
sent by Linux kernel when `conf/*/enhanced_dad` is enabled on the
relevant network interface. It looks like it appeared in the linked
kernel commit.

In accordance with RFC 7527, a nonce can help distinguish valid DAD NS
messages in the presence of Ethernet loopbacks: after a DAD probe is
sent on the network, if an NS is received with the same nonce it is
considered looped back and ignored.

We implement the printer for this option and add a simple test with 3
different verbosity levels.

Link: torvalds/linux@adc176c
Link: https://www.iana.org/assignments/icmpv6-parameters/icmpv6-parameters.xhtml#icmpv6-parameters-5
    @bonktree
    bonktree committed Mar 2, 2024
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