florianl / go-tc / 29441037495

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feat(flower): add IPv6 address match keys (#330)

Wire up the KeyIPv6Src/SrcMask/Dst/DstMask flower match keys (the
tcaFlowerKeyIPv6* attribute constants already existed but had no struct
fields, marshal, or unmarshal). IPv6 addresses are carried as *net.IP
and encoded as the 16-byte TCA_FLOWER_KEY_IPV6_* attributes, mirroring
the existing IPv4 key handling.

Adds ipv6ToBytes/bytesToIPv6 helpers and extends the flower round-trip
test with IPv6 src/dst + masks.

This unblocks IPv6 support for hardware-offloaded flower filters on
switchdev VF representors.

Signed-off-by: Maximilian Rink <maximilian.rink@telekom.de>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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