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cidr.go
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cidr.go
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// Copyright 2019 Authors of Cilium
//
// 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 cidr
import (
"fmt"
"net"
)
// NewCIDR returns a new CIDR using a net.IPNet
func NewCIDR(ipnet *net.IPNet) *CIDR {
if ipnet == nil {
return nil
}
return &CIDR{ipnet}
}
// CIDR is a network CIDR representation based on net.IPNet
type CIDR struct {
*net.IPNet
}
// DeepCopy creates a deep copy of a CIDR
func (n *CIDR) DeepCopy() *CIDR {
if n == nil {
return nil
}
out := &CIDR{
&net.IPNet{
IP: make([]byte, len(n.IP)),
Mask: make([]byte, len(n.Mask)),
},
}
copy(out.IP, n.IP)
copy(out.Mask, n.Mask)
return out
}
// ParseCIDR parses the CIDR string using net.ParseCIDR
func ParseCIDR(str string) (*CIDR, error) {
_, ipnet, err := net.ParseCIDR(str)
if err != nil {
return nil, err
}
return NewCIDR(ipnet), nil
}
// MustParseCIDR parses the CIDR string using net.ParseCIDR and panics if the
// CIDR cannot be parsed
func MustParseCIDR(str string) *CIDR {
c, err := ParseCIDR(str)
if err != nil {
panic(fmt.Sprintf("Unable to parse CIDR '%s': %s", str, err))
}
return c
}