Apply the libcalico-go write defaults in the CRD schemas - #13872
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Native CRD writes bypass libcalico-go, so the schemas carry the IP pool, Felix and kube-controllers defaults it applies on write. blockSize takes a MutatingAdmissionPolicy instead, since the value depends on whether the CIDR is v4 or v6. Found during the v3.33 test cycle, Zephyr OS-R233. CORE-13651
The immutability rule is a CEL transition rule, so it does not fire when the field is absent from the incoming object. Defaulting on update means a write that omits blockSize gets the stored value back rather than zero. CORE-13651
A static schema default also lands on pools that set a namespaceSelector, which the schema then rejects for combining a namespaceSelector with Tunnel. The policy defaults those pools to Workload alone. CORE-13651
Kubernetes 1.32 has no MutatingAdmissionPolicy, so the schema-defaults test cannot expect a value the policy supplies. CORE-13651
The test compares the stored object against the one it wrote, so every field the schema defaults has to be in the input. CORE-13651
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Both specs compare a stored object against the one they wrote, so the fields the CRD now defaults have to be in the expectation. CORE-13651
etcdv3 has no CRD schema, so a raw backend write stores the empty modes. CORE-13651
MichalFupso
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Sep 16, 2026
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Description
Resources written through the native
projectcalico.org/v3CRDs were stored without the field defaults the aggregated API server used to persist, so a rawkubectlor GitOps reader saw empty values where the docs promise otherwise. Calico's own components were unaffected, since libcalico-go applies the same defaults on read.ipipMode,vxlanModeandallowedUsesnow take CRD schema defaults, matching what libcalico-go writes.floatingIPs,bpfConnectTimeLoadBalancingandbpfHostNetworkedNATWithoutCTLB. These sit at the lowest-precedence config source, below environment variables, and the values match Felix's own built-in defaults.prometheusMetricsPortdefaults to 9094 rather than reading as 0, which meant metrics disabled.blockSizetakes a MutatingAdmissionPolicy rather than a schema default, since IPv4 wants 26 and IPv6 wants 122. It defaults on update as well as create, because the immutability rule is a CEL transition rule that cannot fire on an absent field, so a write omittingblockSizecould otherwise clear it.The defaults land on the v1
crd.projectcalico.orgCRDs as well, since both sets generate from the same Go types. Aggregated-mode writes already persisted these values, and the v1/v3 consistency check still passes.Found during the v3.33 test cycle, Zephyr OS-R233.
Related: CORE-13651
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