IP/CIDR validation improvements

[danwinship]

Enhancement Description

• One-line enhancement description (can be used as a release note): Improvements to validation of IP addresses and CIDR values.
• Kubernetes Enhancement Proposal: https://github.com/kubernetes/enhancements/tree/master/keps/sig-network/4858-ip-cidr-validation
• Discussion Link: Tighten IP/CIDR validation kubernetes#122550 has background; I am belatedly writing a KEP to centralize further discussion and because it will just be easier to track this work with a KEP.
• Primary contact (assignee): @danwinship
• Responsible SIGs: sig-network
• Enhancement target (which target equals to which milestone):
  • Alpha release target (x.y):
  • Beta release target (x.y):
  • Stable release target (x.y):
• Alpha
  • KEP (k/enhancements) update PR(s): KEP-4858: IP/CIDR Validation Improvements #4899
  • Code (k/k) update PR(s):
    • Tighten IP/CIDR validation kubernetes#122550
    • warn on bad IPs in objects kubernetes#128786
    • Canonicalize IPs written out by controllers kubernetes#130101
  • Docs (k/website) update PR(s): KEP-4858: Add StrictIPCIDRValidation feature gate file website#49942

Please keep this description up to date. This will help the Enhancement Team to track the evolution of the enhancement efficiently.

[danwinship]

/sig network
/assign

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/lifecycle stale

[danwinship]

/remove-lifecycle stale

[danwinship]

/remove-lifecycle stale
/label lead-opted-in
/milestone v1.33

targeting alpha for 1.33