mirror of
https://github.com/ceph/ceph-csi.git
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288 lines
8.9 KiB
Go
288 lines
8.9 KiB
Go
/*
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Copyright 2023 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package library
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import (
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"fmt"
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"net/netip"
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"github.com/google/cel-go/cel"
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"github.com/google/cel-go/common/types"
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"github.com/google/cel-go/common/types/ref"
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apiservercel "k8s.io/apiserver/pkg/cel"
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)
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// CIDR provides a CEL function library extension of CIDR notation parsing functions.
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//
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// cidr
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//
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// Converts a string in CIDR notation to a network address representation or results in an error if the string is not a valid CIDR notation.
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// The CIDR must be an IPv4 or IPv6 subnet address with a mask.
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// Leading zeros in IPv4 address octets are not allowed.
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// IPv4-mapped IPv6 addresses (e.g. ::ffff:1.2.3.4/24) are not allowed.
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//
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// cidr(<string>) <CIDR>
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//
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// Examples:
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//
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// cidr('192.168.0.0/16') // returns an IPv4 address with a CIDR mask
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// cidr('::1/128') // returns an IPv6 address with a CIDR mask
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// cidr('192.168.0.0/33') // error
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// cidr('::1/129') // error
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// cidr('192.168.0.1/16') // error, because there are non-0 bits after the prefix
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//
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// isCIDR
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//
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// Returns true if a string is a valid CIDR notation respresentation of a subnet with mask.
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// The CIDR must be an IPv4 or IPv6 subnet address with a mask.
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// Leading zeros in IPv4 address octets are not allowed.
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// IPv4-mapped IPv6 addresses (e.g. ::ffff:1.2.3.4/24) are not allowed.
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//
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// isCIDR(<string>) <bool>
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//
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// Examples:
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//
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// isCIDR('192.168.0.0/16') // returns true
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// isCIDR('::1/128') // returns true
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// isCIDR('192.168.0.0/33') // returns false
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// isCIDR('::1/129') // returns false
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//
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// containsIP / containerCIDR / ip / masked / prefixLength
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//
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// - containsIP: Returns true if a the CIDR contains the given IP address.
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// The IP address must be an IPv4 or IPv6 address.
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// May take either a string or IP address as an argument.
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//
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// - containsCIDR: Returns true if a the CIDR contains the given CIDR.
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// The CIDR must be an IPv4 or IPv6 subnet address with a mask.
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// May take either a string or CIDR as an argument.
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//
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// - ip: Returns the IP address representation of the CIDR.
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//
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// - masked: Returns the CIDR representation of the network address with a masked prefix.
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// This can be used to return the canonical form of the CIDR network.
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//
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// - prefixLength: Returns the prefix length of the CIDR in bits.
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// This is the number of bits in the mask.
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//
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// Examples:
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//
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// cidr('192.168.0.0/24').containsIP(ip('192.168.0.1')) // returns true
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// cidr('192.168.0.0/24').containsIP(ip('192.168.1.1')) // returns false
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// cidr('192.168.0.0/24').containsIP('192.168.0.1') // returns true
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// cidr('192.168.0.0/24').containsIP('192.168.1.1') // returns false
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// cidr('192.168.0.0/16').containsCIDR(cidr('192.168.10.0/24')) // returns true
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// cidr('192.168.1.0/24').containsCIDR(cidr('192.168.2.0/24')) // returns false
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// cidr('192.168.0.0/16').containsCIDR('192.168.10.0/24') // returns true
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// cidr('192.168.1.0/24').containsCIDR('192.168.2.0/24') // returns false
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// cidr('192.168.0.1/24').ip() // returns ipAddr('192.168.0.1')
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// cidr('192.168.0.1/24').ip().family() // returns '4'
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// cidr('::1/128').ip() // returns ipAddr('::1')
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// cidr('::1/128').ip().family() // returns '6'
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// cidr('192.168.0.0/24').masked() // returns cidr('192.168.0.0/24')
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// cidr('192.168.0.1/24').masked() // returns cidr('192.168.0.0/24')
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// cidr('192.168.0.0/24') == cidr('192.168.0.0/24').masked() // returns true, CIDR was already in canonical format
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// cidr('192.168.0.1/24') == cidr('192.168.0.1/24').masked() // returns false, CIDR was not in canonical format
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// cidr('192.168.0.0/16').prefixLength() // returns 16
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// cidr('::1/128').prefixLength() // returns 128
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func CIDR() cel.EnvOption {
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return cel.Lib(cidrsLib)
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}
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var cidrsLib = &cidrs{}
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type cidrs struct{}
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func (*cidrs) LibraryName() string {
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return "net.cidr"
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}
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var cidrLibraryDecls = map[string][]cel.FunctionOpt{
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"cidr": {
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cel.Overload("string_to_cidr", []*cel.Type{cel.StringType}, apiservercel.CIDRType,
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cel.UnaryBinding(stringToCIDR)),
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},
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"containsIP": {
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cel.MemberOverload("cidr_contains_ip_string", []*cel.Type{apiservercel.CIDRType, cel.StringType}, cel.BoolType,
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cel.BinaryBinding(cidrContainsIPString)),
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cel.MemberOverload("cidr_contains_ip_ip", []*cel.Type{apiservercel.CIDRType, apiservercel.IPType}, cel.BoolType,
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cel.BinaryBinding(cidrContainsIP)),
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},
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"containsCIDR": {
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cel.MemberOverload("cidr_contains_cidr_string", []*cel.Type{apiservercel.CIDRType, cel.StringType}, cel.BoolType,
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cel.BinaryBinding(cidrContainsCIDRString)),
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cel.MemberOverload("cidr_contains_cidr", []*cel.Type{apiservercel.CIDRType, apiservercel.CIDRType}, cel.BoolType,
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cel.BinaryBinding(cidrContainsCIDR)),
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},
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"ip": {
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cel.MemberOverload("cidr_ip", []*cel.Type{apiservercel.CIDRType}, apiservercel.IPType,
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cel.UnaryBinding(cidrToIP)),
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},
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"prefixLength": {
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cel.MemberOverload("cidr_prefix_length", []*cel.Type{apiservercel.CIDRType}, cel.IntType,
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cel.UnaryBinding(prefixLength)),
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},
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"masked": {
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cel.MemberOverload("cidr_masked", []*cel.Type{apiservercel.CIDRType}, apiservercel.CIDRType,
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cel.UnaryBinding(masked)),
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},
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"isCIDR": {
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cel.Overload("is_cidr", []*cel.Type{cel.StringType}, cel.BoolType,
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cel.UnaryBinding(isCIDR)),
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},
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"string": {
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cel.Overload("cidr_to_string", []*cel.Type{apiservercel.CIDRType}, cel.StringType,
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cel.UnaryBinding(cidrToString)),
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},
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}
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func (*cidrs) CompileOptions() []cel.EnvOption {
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options := []cel.EnvOption{cel.Types(apiservercel.CIDRType),
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cel.Variable(apiservercel.CIDRType.TypeName(), types.NewTypeTypeWithParam(apiservercel.CIDRType)),
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}
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for name, overloads := range cidrLibraryDecls {
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options = append(options, cel.Function(name, overloads...))
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}
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return options
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}
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func (*cidrs) ProgramOptions() []cel.ProgramOption {
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return []cel.ProgramOption{}
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}
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func stringToCIDR(arg ref.Val) ref.Val {
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s, ok := arg.Value().(string)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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net, err := parseCIDR(s)
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if err != nil {
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return types.NewErr("network address parse error during conversion from string: %v", err)
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}
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return apiservercel.CIDR{
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Prefix: net,
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}
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}
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func cidrToString(arg ref.Val) ref.Val {
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cidr, ok := arg.(apiservercel.CIDR)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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return types.String(cidr.Prefix.String())
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}
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func cidrContainsIPString(arg ref.Val, other ref.Val) ref.Val {
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return cidrContainsIP(arg, stringToIP(other))
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}
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func cidrContainsCIDRString(arg ref.Val, other ref.Val) ref.Val {
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return cidrContainsCIDR(arg, stringToCIDR(other))
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}
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func cidrContainsIP(arg ref.Val, other ref.Val) ref.Val {
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cidr, ok := arg.(apiservercel.CIDR)
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if !ok {
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return types.MaybeNoSuchOverloadErr(other)
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}
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ip, ok := other.(apiservercel.IP)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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return types.Bool(cidr.Contains(ip.Addr))
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}
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func cidrContainsCIDR(arg ref.Val, other ref.Val) ref.Val {
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cidr, ok := arg.(apiservercel.CIDR)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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containsCIDR, ok := other.(apiservercel.CIDR)
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if !ok {
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return types.MaybeNoSuchOverloadErr(other)
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}
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equalMasked := cidr.Prefix.Masked() == netip.PrefixFrom(containsCIDR.Prefix.Addr(), cidr.Prefix.Bits())
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return types.Bool(equalMasked && cidr.Prefix.Bits() <= containsCIDR.Prefix.Bits())
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}
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func prefixLength(arg ref.Val) ref.Val {
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cidr, ok := arg.(apiservercel.CIDR)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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return types.Int(cidr.Prefix.Bits())
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}
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func isCIDR(arg ref.Val) ref.Val {
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s, ok := arg.Value().(string)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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_, err := parseCIDR(s)
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return types.Bool(err == nil)
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}
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func cidrToIP(arg ref.Val) ref.Val {
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cidr, ok := arg.(apiservercel.CIDR)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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return apiservercel.IP{
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Addr: cidr.Prefix.Addr(),
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}
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}
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func masked(arg ref.Val) ref.Val {
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cidr, ok := arg.(apiservercel.CIDR)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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maskedCIDR := cidr.Prefix.Masked()
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return apiservercel.CIDR{
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Prefix: maskedCIDR,
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}
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}
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// parseCIDR parses a string into an CIDR.
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// We use this function to parse CIDR notation in the CEL library
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// so that we can share the common logic of rejecting strings
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// that IPv4-mapped IPv6 addresses or contain non-zero bits after the mask.
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func parseCIDR(raw string) (netip.Prefix, error) {
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net, err := netip.ParsePrefix(raw)
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if err != nil {
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return netip.Prefix{}, fmt.Errorf("network address parse error during conversion from string: %v", err)
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}
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if net.Addr().Is4In6() {
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return netip.Prefix{}, fmt.Errorf("IPv4-mapped IPv6 address %q is not allowed", raw)
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}
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return net, nil
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}
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