| // Copyright Istio 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 matcher |
| |
| import ( |
| "fmt" |
| "net" |
| "strings" |
| ) |
| |
| import ( |
| corepb "github.com/envoyproxy/go-control-plane/envoy/config/core/v3" |
| wrappers "google.golang.org/protobuf/types/known/wrapperspb" |
| ) |
| |
| // CidrRange converts a CIDR or a single IP string to a corresponding CidrRange. For a single IP |
| // string the converted CidrRange prefix is either 32 (for ipv4) or 128 (for ipv6). |
| func CidrRange(v string) (*corepb.CidrRange, error) { |
| var address string |
| var prefixLen int |
| |
| if strings.Contains(v, "/") { |
| if ip, ipnet, err := net.ParseCIDR(v); err == nil { |
| address = ip.String() |
| prefixLen, _ = ipnet.Mask.Size() |
| } else { |
| return nil, fmt.Errorf("invalid cidr range: %v", err) |
| } |
| } else { |
| if ip := net.ParseIP(v); ip != nil { |
| address = ip.String() |
| if strings.Contains(v, ".") { |
| // Set the prefixLen to 32 for ipv4 address. |
| prefixLen = 32 |
| } else if strings.Contains(v, ":") { |
| // Set the prefixLen to 128 for ipv6 address. |
| prefixLen = 128 |
| } else { |
| return nil, fmt.Errorf("invalid ip address: %s", v) |
| } |
| } else { |
| return nil, fmt.Errorf("invalid ip address: %s", v) |
| } |
| } |
| |
| return &corepb.CidrRange{ |
| AddressPrefix: address, |
| PrefixLen: &wrappers.UInt32Value{Value: uint32(prefixLen)}, |
| }, nil |
| } |