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Merge pull request #99574 from pacoxu/feature/check-ipv6-site-warnings

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kubeadm: a warning to user as ipv6 site-local is deprecated
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Kubernetes Prow Robot 2021-03-02 11:11:43 -08:00 committed by GitHub
commit 445cb0609d
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1 changed files with 7 additions and 0 deletions
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7
cmd/kubeadm/app/apis/kubeadm/validation/validation.go
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@ -32,6 +32,7 @@ import (
"k8s.io/apimachinery/pkg/util/validation/field"
bootstrapapi "k8s.io/cluster-bootstrap/token/api"
bootstraputil "k8s.io/cluster-bootstrap/token/util"
"k8s.io/klog/v2"
"k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
kubeadmapiv1beta2 "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta2"
kubeadmcmdoptions "k8s.io/kubernetes/cmd/kubeadm/app/cmd/options"
@ -399,6 +400,12 @@ func ValidateIPNetFromString(subnetStr string, minAddrs int64, isDualStack bool,
if numAddresses < minAddrs {
allErrs = append(allErrs, field.Invalid(fldPath, s.String(), fmt.Sprintf("subnet with %d address(es) is too small, the minimum is %d", numAddresses, minAddrs)))
}
// Warn when the subnet is in site-local range - i.e. contains addresses that belong to fec0::/10
_, siteLocalNet, _ := net.ParseCIDR("fec0::/10")
if siteLocalNet.Contains(s.IP) || s.Contains(siteLocalNet.IP) {
klog.Warningf("the subnet %v contains IPv6 site-local addresses that belong to fec0::/10 which has been deprecated by rfc3879", s)
}
}
return allErrs
}