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 }