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// Copyright 2019 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 iptables
import (
"gvisor.dev/gvisor/pkg/log"
"gvisor.dev/gvisor/pkg/tcpip"
)
// AcceptTarget accepts packets.
type AcceptTarget struct{}
// Action implements Target.Action.
func (AcceptTarget) Action(packet tcpip.PacketBuffer) (RuleVerdict, int) {
return RuleAccept, 0
}
// DropTarget drops packets.
type DropTarget struct{}
// Action implements Target.Action.
func (DropTarget) Action(packet tcpip.PacketBuffer) (RuleVerdict, int) {
return RuleDrop, 0
}
// ErrorTarget logs an error and drops the packet. It represents a target that
// should be unreachable.
type ErrorTarget struct{}
// Action implements Target.Action.
func (ErrorTarget) Action(packet tcpip.PacketBuffer) (RuleVerdict, int) {
log.Debugf("ErrorTarget triggered.")
return RuleDrop, 0
}
// UserChainTarget marks a rule as the beginning of a user chain.
type UserChainTarget struct {
Name string
}
// Action implements Target.Action.
func (UserChainTarget) Action(tcpip.PacketBuffer) (RuleVerdict, int) {
panic("UserChainTarget should never be called.")
}
// ReturnTarget returns from the current chain. If the chain is a built-in, the
// hook's underflow should be called.
type ReturnTarget struct{}
// Action implements Target.Action.
func (ReturnTarget) Action(tcpip.PacketBuffer) (RuleVerdict, int) {
return RuleReturn, 0
}
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