diff options
Diffstat (limited to 'pkg/tcpip/iptables')
| -rw-r--r-- | pkg/tcpip/iptables/BUILD | 15 | ||||
| -rw-r--r-- | pkg/tcpip/iptables/iptables.go | 81 | ||||
| -rw-r--r-- | pkg/tcpip/iptables/targets.go | 35 | ||||
| -rw-r--r-- | pkg/tcpip/iptables/types.go | 196 |
4 files changed, 0 insertions, 327 deletions
diff --git a/pkg/tcpip/iptables/BUILD b/pkg/tcpip/iptables/BUILD deleted file mode 100644 index cc5f531e2..000000000 --- a/pkg/tcpip/iptables/BUILD +++ /dev/null @@ -1,15 +0,0 @@ -load("//tools/go_stateify:defs.bzl", "go_library") - -package(licenses = ["notice"]) - -go_library( - name = "iptables", - srcs = [ - "iptables.go", - "targets.go", - "types.go", - ], - importpath = "gvisor.dev/gvisor/pkg/tcpip/iptables", - visibility = ["//visibility:public"], - deps = ["//pkg/tcpip/buffer"], -) diff --git a/pkg/tcpip/iptables/iptables.go b/pkg/tcpip/iptables/iptables.go deleted file mode 100644 index 68c68d4aa..000000000 --- a/pkg/tcpip/iptables/iptables.go +++ /dev/null @@ -1,81 +0,0 @@ -// 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 supports packet filtering and manipulation via the iptables -// tool. -package iptables - -const ( - tablenameNat = "nat" - tablenameMangle = "mangle" -) - -// Chain names as defined by net/ipv4/netfilter/ip_tables.c. -const ( - chainNamePrerouting = "PREROUTING" - chainNameInput = "INPUT" - chainNameForward = "FORWARD" - chainNameOutput = "OUTPUT" - chainNamePostrouting = "POSTROUTING" -) - -// DefaultTables returns a default set of tables. Each chain is set to accept -// all packets. -func DefaultTables() IPTables { - return IPTables{ - Tables: map[string]Table{ - tablenameNat: Table{ - BuiltinChains: map[Hook]Chain{ - Prerouting: unconditionalAcceptChain(chainNamePrerouting), - Input: unconditionalAcceptChain(chainNameInput), - Output: unconditionalAcceptChain(chainNameOutput), - Postrouting: unconditionalAcceptChain(chainNamePostrouting), - }, - DefaultTargets: map[Hook]Target{ - Prerouting: UnconditionalAcceptTarget{}, - Input: UnconditionalAcceptTarget{}, - Output: UnconditionalAcceptTarget{}, - Postrouting: UnconditionalAcceptTarget{}, - }, - UserChains: map[string]Chain{}, - }, - tablenameMangle: Table{ - BuiltinChains: map[Hook]Chain{ - Prerouting: unconditionalAcceptChain(chainNamePrerouting), - Output: unconditionalAcceptChain(chainNameOutput), - }, - DefaultTargets: map[Hook]Target{ - Prerouting: UnconditionalAcceptTarget{}, - Output: UnconditionalAcceptTarget{}, - }, - UserChains: map[string]Chain{}, - }, - }, - Priorities: map[Hook][]string{ - Prerouting: []string{tablenameMangle, tablenameNat}, - Output: []string{tablenameMangle, tablenameNat}, - }, - } -} - -func unconditionalAcceptChain(name string) Chain { - return Chain{ - Name: name, - Rules: []Rule{ - Rule{ - Target: UnconditionalAcceptTarget{}, - }, - }, - } -} diff --git a/pkg/tcpip/iptables/targets.go b/pkg/tcpip/iptables/targets.go deleted file mode 100644 index 19a7f77e3..000000000 --- a/pkg/tcpip/iptables/targets.go +++ /dev/null @@ -1,35 +0,0 @@ -// 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. - -// This file contains various Targets. - -package iptables - -import "gvisor.dev/gvisor/pkg/tcpip/buffer" - -// UnconditionalAcceptTarget accepts all packets. -type UnconditionalAcceptTarget struct{} - -// Action implements Target.Action. -func (UnconditionalAcceptTarget) Action(packet buffer.VectorisedView) (Verdict, string) { - return Accept, "" -} - -// UnconditionalDropTarget denies all packets. -type UnconditionalDropTarget struct{} - -// Action implements Target.Action. -func (UnconditionalDropTarget) Action(packet buffer.VectorisedView) (Verdict, string) { - return Drop, "" -} diff --git a/pkg/tcpip/iptables/types.go b/pkg/tcpip/iptables/types.go deleted file mode 100644 index 42a79ef9f..000000000 --- a/pkg/tcpip/iptables/types.go +++ /dev/null @@ -1,196 +0,0 @@ -// 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/tcpip/buffer" -) - -// A Hook specifies one of the hooks built into the network stack. -// -// Userspace app Userspace app -// ^ | -// | v -// [Input] [Output] -// ^ | -// | v -// | routing -// | | -// | v -// ----->[Prerouting]----->routing----->[Forward]---------[Postrouting]-----> -type Hook uint - -// These values correspond to values in include/uapi/linux/netfilter.h. -const ( - // Prerouting happens before a packet is routed to applications or to - // be forwarded. - Prerouting Hook = iota - - // Input happens before a packet reaches an application. - Input - - // Forward happens once it's decided that a packet should be forwarded - // to another host. - Forward - - // Output happens after a packet is written by an application to be - // sent out. - Output - - // Postrouting happens just before a packet goes out on the wire. - Postrouting - - // The total number of hooks. - NumHooks -) - -// A Verdict is returned by a rule's target to indicate how traversal of rules -// should (or should not) continue. -type Verdict int - -const ( - // Accept indicates the packet should continue traversing netstack as - // normal. - Accept Verdict = iota - - // Drop inicates the packet should be dropped, stopping traversing - // netstack. - Drop - - // Stolen indicates the packet was co-opted by the target and should - // stop traversing netstack. - Stolen - - // Queue indicates the packet should be queued for userspace processing. - Queue - - // Repeat indicates the packet should re-traverse the chains for the - // current hook. - Repeat - - // None indicates no verdict was reached. - None - - // Jump indicates a jump to another chain. - Jump - - // Continue indicates that traversal should continue at the next rule. - Continue - - // Return indicates that traversal should return to the calling chain. - Return -) - -// IPTables holds all the tables for a netstack. -type IPTables struct { - // Tables maps table names to tables. User tables have arbitrary names. - Tables map[string]Table - - // Priorities maps each hook to a list of table names. The order of the - // list is the order in which each table should be visited for that - // hook. - Priorities map[Hook][]string -} - -// A Table defines a set of chains and hooks into the network stack. The -// currently supported tables are: -// * nat -// * mangle -type Table struct { - // BuiltinChains holds the un-deletable chains built into netstack. If - // a hook isn't present in the map, this table doesn't utilize that - // hook. - BuiltinChains map[Hook]Chain - - // DefaultTargets holds a target for each hook that will be executed if - // chain traversal doesn't yield a verdict. - DefaultTargets map[Hook]Target - - // UserChains holds user-defined chains for the keyed by name. Users - // can give their chains arbitrary names. - UserChains map[string]Chain - - // Chains maps names to chains for both builtin and user-defined chains. - // Its entries point to Chains already either in BuiltinChains or - // UserChains, and its purpose is to make looking up tables by name - // fast. - Chains map[string]*Chain - - // Metadata holds information about the Table that is useful to users - // of IPTables, but not to the netstack IPTables code itself. - metadata interface{} -} - -// ValidHooks returns a bitmap of the builtin hooks for the given table. -func (table *Table) ValidHooks() uint32 { - hooks := uint32(0) - for hook, _ := range table.BuiltinChains { - hooks |= 1 << hook - } - return hooks -} - -// Metadata returns the metadata object stored in table. -func (table *Table) Metadata() interface{} { - return table.metadata -} - -// SetMetadata sets the metadata object stored in table. -func (table *Table) SetMetadata(metadata interface{}) { - table.metadata = metadata -} - -// A Chain defines a list of rules for packet processing. When a packet -// traverses a chain, it is checked against each rule until either a rule -// returns a verdict or the chain ends. -// -// By convention, builtin chains end with a rule that matches everything and -// returns either Accept or Drop. User-defined chains end with Return. These -// aren't strictly necessary here, but the iptables tool writes tables this way. -type Chain struct { - // Name is the chain name. - Name string - - // Rules is the list of rules to traverse. - Rules []Rule -} - -// A Rule is a packet processing rule. It consists of two pieces. First it -// contains zero or more matchers, each of which is a specification of which -// packets this rule applies to. If there are no matchers in the rule, it -// applies to any packet. -type Rule struct { - // Matchers is the list of matchers for this rule. - Matchers []Matcher - - // Target is the action to invoke if all the matchers match the packet. - Target Target -} - -// A Matcher is the interface for matching packets. -type Matcher interface { - // Match returns whether the packet matches and whether the packet - // should be "hotdropped", i.e. dropped immediately. This is usually - // used for suspicious packets. - Match(hook Hook, packet buffer.VectorisedView, interfaceName string) (matches bool, hotdrop bool) -} - -// A Target is the interface for taking an action for a packet. -type Target interface { - // Action takes an action on the packet and returns a verdict on how - // traversal should (or should not) continue. If the return value is - // Jump, it also returns the name of the chain to jump to. - Action(packet buffer.VectorisedView) (Verdict, string) -} |