github.com/fafucoder/cilium@v1.6.11/cilium/cmd/bpf_nat_flush.go (about)

     1  // Copyright 2019 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 cmd
    16  
    17  import (
    18  	"fmt"
    19  	"os"
    20  
    21  	"github.com/cilium/cilium/common"
    22  	"github.com/cilium/cilium/pkg/maps/nat"
    23  
    24  	"github.com/spf13/cobra"
    25  )
    26  
    27  // bpfNatFlushCmd represents the bpf_nat_flush command
    28  var bpfNatFlushCmd = &cobra.Command{
    29  	Use:   "flush",
    30  	Short: "Flush all NAT mapping entries",
    31  	Run: func(cmd *cobra.Command, args []string) {
    32  		common.RequireRootPrivilege("cilium bpf nat flush")
    33  		flushNat()
    34  	},
    35  }
    36  
    37  func init() {
    38  	bpfNatCmd.AddCommand(bpfNatFlushCmd)
    39  }
    40  
    41  func flushNat() {
    42  	ipv4, ipv6 := nat.GlobalMaps(true, true)
    43  
    44  	for _, m := range []*nat.Map{ipv4, ipv6} {
    45  		if m == nil {
    46  			continue
    47  		}
    48  		path, err := m.Path()
    49  		if err == nil {
    50  			err = m.Open()
    51  		}
    52  		if err != nil {
    53  			if os.IsNotExist(err) {
    54  				fmt.Fprintf(os.Stderr, "Unable to open %s: %s. Skipping.\n", path, err)
    55  				continue
    56  			}
    57  			Fatalf("Unable to open %s: %s", path, err)
    58  		}
    59  		defer m.Close()
    60  		entries := m.Flush()
    61  		fmt.Printf("Flushed %d entries from %s\n", entries, path)
    62  	}
    63  }