Erik Nordmark adc176c547
ipv6 addrconf: Implemented enhanced DAD (RFC7527) ...
Implemented RFC7527 Enhanced DAD.
IPv6 duplicate address detection can fail if there is some temporary
loopback of Ethernet frames. RFC7527 solves this by including a random
nonce in the NS messages used for DAD, and if an NS is received with the
same nonce it is assumed to be a looped back DAD probe and is ignored.
RFC7527 is enabled by default. Can be disabled by setting both of
conf/{all,interface}/enhanced_dad to zero.
Signed-off-by: Erik Nordmark <nordmark@arista.com >
Signed-off-by: Bob Gilligan <gilligan@arista.com >
Reviewed-by: Hannes Frederic Sowa <hannes@stressinduktion.org >
Signed-off-by: David S. Miller <davem@davemloft.net >
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