Move CRI from pkg/ to internal/

Signed-off-by: Maksym Pavlenko <pavlenko.maksym@gmail.com>

internal/cri/config/config_kernel_linux.go

@@ -0,0 +1,53 @@
+//go:build linux
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package config
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	kernel "github.com/containerd/containerd/v2/pkg/kernelversion"
+)
+
+var kernelGreaterEqualThan = kernel.GreaterEqualThan
+
+func ValidateEnableUnprivileged(ctx context.Context, c *RuntimeConfig) error {
+	if c.EnableUnprivilegedICMP || c.EnableUnprivilegedPorts {
+		fourDotEleven := kernel.KernelVersion{Kernel: 4, Major: 11}
+		ok, err := kernelGreaterEqualThan(fourDotEleven)
+		if err != nil {
+			return fmt.Errorf("check current system kernel version error: %w", err)
+		}
+		if !ok {
+			return errors.New("unprivileged_icmp and unprivileged_port require kernel version greater than or equal to 4.11")
+		}
+	}
+	return nil
+}
+
+var kernelSupportsRro bool
+
+func init() {
+	var err error
+	kernelSupportsRro, err = kernelGreaterEqualThan(kernel.KernelVersion{Kernel: 5, Major: 12})
+	if err != nil {
+		panic(fmt.Errorf("check current system kernel version error: %w", err))
+	}
+}