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// Copyright 2022 The gVisor 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 cmd
import (
"context"
_ "embed"
"log"
"github.com/google/subcommands"
"gvisor.dev/gvisor/runsc/flag"
)
//go:embed bpf/drop_ebpf.o
var dropProgram []byte
// DropCommand is a subcommand for dropping packets.
type DropCommand struct {
device string
deviceIndex int
}
// Name implements subcommands.Command.Name.
func (*DropCommand) Name() string {
return "drop"
}
// Synopsis implements subcommands.Command.Synopsis.
func (*DropCommand) Synopsis() string {
return "Drop all packets to the kernel network stack."
}
// Usage implements subcommands.Command.Usage.
func (*DropCommand) Usage() string {
return "drop -device <device> or -devidx <device index>"
}
// SetFlags implements subcommands.Command.SetFlags.
func (pc *DropCommand) SetFlags(fs *flag.FlagSet) {
fs.StringVar(&pc.device, "device", "", "which device to attach to")
fs.IntVar(&pc.deviceIndex, "devidx", 0, "which device to attach to")
}
// Execute implements subcommands.Command.Execute.
func (pc *DropCommand) Execute(context.Context, *flag.FlagSet, ...any) subcommands.ExitStatus {
if err := runBasicProgram(dropProgram, pc.device, pc.deviceIndex); err != nil {
log.Printf("%v", err)
return subcommands.ExitFailure
}
return subcommands.ExitSuccess
}
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