82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
// Copyright 2019 The gVisor authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package iptables supports packet filtering and manipulation via the iptables
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// tool.
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package iptables
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const (
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tablenameNat = "nat"
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tablenameMangle = "mangle"
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)
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// Chain names as defined by net/ipv4/netfilter/ip_tables.c.
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const (
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chainNamePrerouting = "PREROUTING"
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chainNameInput = "INPUT"
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chainNameForward = "FORWARD"
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chainNameOutput = "OUTPUT"
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chainNamePostrouting = "POSTROUTING"
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)
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// DefaultTables returns a default set of tables. Each chain is set to accept
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// all packets.
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func DefaultTables() IPTables {
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return IPTables{
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Tables: map[string]Table{
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tablenameNat: Table{
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BuiltinChains: map[Hook]Chain{
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Prerouting: unconditionalAcceptChain(chainNamePrerouting),
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Input: unconditionalAcceptChain(chainNameInput),
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Output: unconditionalAcceptChain(chainNameOutput),
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Postrouting: unconditionalAcceptChain(chainNamePostrouting),
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},
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DefaultTargets: map[Hook]Target{
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Prerouting: UnconditionalAcceptTarget{},
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Input: UnconditionalAcceptTarget{},
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Output: UnconditionalAcceptTarget{},
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Postrouting: UnconditionalAcceptTarget{},
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},
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UserChains: map[string]Chain{},
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},
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tablenameMangle: Table{
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BuiltinChains: map[Hook]Chain{
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Prerouting: unconditionalAcceptChain(chainNamePrerouting),
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Output: unconditionalAcceptChain(chainNameOutput),
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},
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DefaultTargets: map[Hook]Target{
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Prerouting: UnconditionalAcceptTarget{},
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Output: UnconditionalAcceptTarget{},
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},
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UserChains: map[string]Chain{},
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},
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},
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Priorities: map[Hook][]string{
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Prerouting: []string{tablenameMangle, tablenameNat},
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Output: []string{tablenameMangle, tablenameNat},
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},
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}
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}
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func unconditionalAcceptChain(name string) Chain {
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return Chain{
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Name: name,
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Rules: []Rule{
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Rule{
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Target: UnconditionalAcceptTarget{},
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},
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},
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}
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}
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