github.com/fafucoder/cilium@v1.6.11/pkg/ip/cidr.go (about)

     1  // Copyright 2018 Authors of Cilium
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package ip
    16  
    17  import (
    18  	"net"
    19  )
    20  
    21  // ParseCIDRs fetches all CIDRs referred to by the specified slice and returns
    22  // them as regular golang CIDR objects.
    23  func ParseCIDRs(cidrs []string) (valid []*net.IPNet, invalid []string) {
    24  	valid = make([]*net.IPNet, 0, len(cidrs))
    25  	invalid = make([]string, 0, len(cidrs))
    26  	for _, cidr := range cidrs {
    27  		_, prefix, err := net.ParseCIDR(cidr)
    28  		if err != nil {
    29  			// Likely the CIDR is specified in host format.
    30  			ip := net.ParseIP(cidr)
    31  			if ip == nil {
    32  				invalid = append(invalid, cidr)
    33  				continue
    34  			} else {
    35  				prefix = IPToPrefix(ip)
    36  			}
    37  		}
    38  		if prefix != nil {
    39  			valid = append(valid, prefix)
    40  		}
    41  	}
    42  	return valid, invalid
    43  }