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This change helps support iterating over an NDP options buffer so that
implementations can handle all the NDP options present in an NDP packet.
Note, this change does not yet actually handle these options, it just provides
the tools to do so (in preparation for NDP's Prefix, Parameter, and a complete
implementation of Neighbor Discovery).
Tests: Unittests to make sure we can iterate over a valid NDP options buffer
that may contain multiple options. Also tests to check an iterator before
using it to see if the NDP options buffer is malformed.
PiperOrigin-RevId: 277312487
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This change is in preparation for NDP Prefix Discovery and SLAAC where the stack
will need to handle NDP Prefix Information options.
Tests: Test that given an NDP Prefix Information option buffer, correct values
are returned by the field getters.
PiperOrigin-RevId: 276594592
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This change is in preparation for NDP Router Discovery where the stack will need
to handle NDP Router Advertisments.
Tests: Test that given an NDP Router Advertisement buffer (body of an ICMPv6
packet, correct values are returned by the field getters).
PiperOrigin-RevId: 276146817
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This change adds support for Duplicate Address Detection on IPv6 addresses
as defined by RFC 4862 section 5.4.
Note, this change will not break existing uses of netstack as the default
configuration for the stack options is set in such a way that DAD will not be
performed. See `stack.Options` and `stack.NDPConfigurations` for more details.
Tests: Tests to make sure that the DAD process properly resolves or fails.
That is, tests make sure that DAD resolves only if:
- No other node is performing DAD for the same address
- No other node owns the same address
PiperOrigin-RevId: 275189471
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