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1# SPDX-License-Identifier: GPL-2.0-only
2#
3# IP netfilter configuration
4#
5
6menu "IP: Netfilter Configuration"
7 depends on INET && NETFILTER
8
9config NF_DEFRAG_IPV4
10 tristate
11 default n
12
13config NF_SOCKET_IPV4
14 tristate "IPv4 socket lookup support"
15 help
16 This option enables the IPv4 socket lookup infrastructure. This is
17 is required by the {ip,nf}tables socket match.
18
19config NF_TPROXY_IPV4
20 tristate "IPv4 tproxy support"
21
22if NF_TABLES
23
24config NF_TABLES_IPV4
25 bool "IPv4 nf_tables support"
26 help
27 This option enables the IPv4 support for nf_tables.
28
29if NF_TABLES_IPV4
30
31config NFT_REJECT_IPV4
32 select NF_REJECT_IPV4
33 default NFT_REJECT
34 tristate
35
36config NFT_DUP_IPV4
37 tristate "IPv4 nf_tables packet duplication support"
38 depends on !NF_CONNTRACK || NF_CONNTRACK
39 select NF_DUP_IPV4
40 help
41 This module enables IPv4 packet duplication support for nf_tables.
42
43config NFT_FIB_IPV4
44 select NFT_FIB
45 tristate "nf_tables fib / ip route lookup support"
46 help
47 This module enables IPv4 FIB lookups, e.g. for reverse path filtering.
48 It also allows query of the FIB for the route type, e.g. local, unicast,
49 multicast or blackhole.
50
51endif # NF_TABLES_IPV4
52
53config NF_TABLES_ARP
54 bool "ARP nf_tables support"
55 select NETFILTER_FAMILY_ARP
56 help
57 This option enables the ARP support for nf_tables.
58
59endif # NF_TABLES
60
61config NF_FLOW_TABLE_IPV4
62 tristate "Netfilter flow table IPv4 module"
63 depends on NF_FLOW_TABLE
64 help
65 This option adds the flow table IPv4 support.
66
67 To compile it as a module, choose M here.
68
69config NF_DUP_IPV4
70 tristate "Netfilter IPv4 packet duplication to alternate destination"
71 depends on !NF_CONNTRACK || NF_CONNTRACK
72 help
73 This option enables the nf_dup_ipv4 core, which duplicates an IPv4
74 packet to be rerouted to another destination.
75
76config NF_LOG_ARP
77 tristate "ARP packet logging"
78 default m if NETFILTER_ADVANCED=n
79 select NF_LOG_COMMON
80
81config NF_LOG_IPV4
82 tristate "IPv4 packet logging"
83 default m if NETFILTER_ADVANCED=n
84 select NF_LOG_COMMON
85
86config NF_REJECT_IPV4
87 tristate "IPv4 packet rejection"
88 default m if NETFILTER_ADVANCED=n
89
90if NF_NAT
91config NF_NAT_SNMP_BASIC
92 tristate "Basic SNMP-ALG support"
93 depends on NF_CONNTRACK_SNMP
94 depends on NETFILTER_ADVANCED
95 default NF_NAT && NF_CONNTRACK_SNMP
96 select ASN1
97 ---help---
98
99 This module implements an Application Layer Gateway (ALG) for
100 SNMP payloads. In conjunction with NAT, it allows a network
101 management system to access multiple private networks with
102 conflicting addresses. It works by modifying IP addresses
103 inside SNMP payloads to match IP-layer NAT mapping.
104
105 This is the "basic" form of SNMP-ALG, as described in RFC 2962
106
107 To compile it as a module, choose M here. If unsure, say N.
108
109config NF_NAT_PPTP
110 tristate
111 depends on NF_CONNTRACK
112 default NF_CONNTRACK_PPTP
113
114config NF_NAT_H323
115 tristate
116 depends on NF_CONNTRACK
117 default NF_CONNTRACK_H323
118
119endif # NF_NAT
120
121config IP_NF_IPTABLES
122 tristate "IP tables support (required for filtering/masq/NAT)"
123 default m if NETFILTER_ADVANCED=n
124 select NETFILTER_XTABLES
125 help
126 iptables is a general, extensible packet identification framework.
127 The packet filtering and full NAT (masquerading, port forwarding,
128 etc) subsystems now use this: say `Y' or `M' here if you want to use
129 either of those.
130
131 To compile it as a module, choose M here. If unsure, say N.
132
133if IP_NF_IPTABLES
134
135# The matches.
136config IP_NF_MATCH_AH
137 tristate '"ah" match support'
138 depends on NETFILTER_ADVANCED
139 help
140 This match extension allows you to match a range of SPIs
141 inside AH header of IPSec packets.
142
143 To compile it as a module, choose M here. If unsure, say N.
144
145config IP_NF_MATCH_ECN
146 tristate '"ecn" match support'
147 depends on NETFILTER_ADVANCED
148 select NETFILTER_XT_MATCH_ECN
149 ---help---
150 This is a backwards-compat option for the user's convenience
151 (e.g. when running oldconfig). It selects
152 CONFIG_NETFILTER_XT_MATCH_ECN.
153
154config IP_NF_MATCH_RPFILTER
155 tristate '"rpfilter" reverse path filter match support'
156 depends on NETFILTER_ADVANCED
157 depends on IP_NF_MANGLE || IP_NF_RAW
158 ---help---
159 This option allows you to match packets whose replies would
160 go out via the interface the packet came in.
161
162 To compile it as a module, choose M here. If unsure, say N.
163 The module will be called ipt_rpfilter.
164
165config IP_NF_MATCH_TTL
166 tristate '"ttl" match support'
167 depends on NETFILTER_ADVANCED
168 select NETFILTER_XT_MATCH_HL
169 ---help---
170 This is a backwards-compat option for the user's convenience
171 (e.g. when running oldconfig). It selects
172 CONFIG_NETFILTER_XT_MATCH_HL.
173
174# `filter', generic and specific targets
175config IP_NF_FILTER
176 tristate "Packet filtering"
177 default m if NETFILTER_ADVANCED=n
178 help
179 Packet filtering defines a table `filter', which has a series of
180 rules for simple packet filtering at local input, forwarding and
181 local output. See the man page for iptables(8).
182
183 To compile it as a module, choose M here. If unsure, say N.
184
185config IP_NF_TARGET_REJECT
186 tristate "REJECT target support"
187 depends on IP_NF_FILTER
188 select NF_REJECT_IPV4
189 default m if NETFILTER_ADVANCED=n
190 help
191 The REJECT target allows a filtering rule to specify that an ICMP
192 error should be issued in response to an incoming packet, rather
193 than silently being dropped.
194
195 To compile it as a module, choose M here. If unsure, say N.
196
197config IP_NF_TARGET_SYNPROXY
198 tristate "SYNPROXY target support"
199 depends on NF_CONNTRACK && NETFILTER_ADVANCED
200 select NETFILTER_SYNPROXY
201 select SYN_COOKIES
202 help
203 The SYNPROXY target allows you to intercept TCP connections and
204 establish them using syncookies before they are passed on to the
205 server. This allows to avoid conntrack and server resource usage
206 during SYN-flood attacks.
207
208 To compile it as a module, choose M here. If unsure, say N.
209
210# NAT + specific targets: nf_conntrack
211config IP_NF_NAT
212 tristate "iptables NAT support"
213 depends on NF_CONNTRACK
214 default m if NETFILTER_ADVANCED=n
215 select NF_NAT
216 select NETFILTER_XT_NAT
217 help
218 This enables the `nat' table in iptables. This allows masquerading,
219 port forwarding and other forms of full Network Address Port
220 Translation.
221
222 To compile it as a module, choose M here. If unsure, say N.
223
224if IP_NF_NAT
225
226config IP_NF_TARGET_MASQUERADE
227 tristate "MASQUERADE target support"
228 select NETFILTER_XT_TARGET_MASQUERADE
229 help
230 This is a backwards-compat option for the user's convenience
231 (e.g. when running oldconfig). It selects NETFILTER_XT_TARGET_MASQUERADE.
232
233config IP_NF_TARGET_NETMAP
234 tristate "NETMAP target support"
235 depends on NETFILTER_ADVANCED
236 select NETFILTER_XT_TARGET_NETMAP
237 ---help---
238 This is a backwards-compat option for the user's convenience
239 (e.g. when running oldconfig). It selects
240 CONFIG_NETFILTER_XT_TARGET_NETMAP.
241
242config IP_NF_TARGET_REDIRECT
243 tristate "REDIRECT target support"
244 depends on NETFILTER_ADVANCED
245 select NETFILTER_XT_TARGET_REDIRECT
246 ---help---
247 This is a backwards-compat option for the user's convenience
248 (e.g. when running oldconfig). It selects
249 CONFIG_NETFILTER_XT_TARGET_REDIRECT.
250
251endif # IP_NF_NAT
252
253# mangle + specific targets
254config IP_NF_MANGLE
255 tristate "Packet mangling"
256 default m if NETFILTER_ADVANCED=n
257 help
258 This option adds a `mangle' table to iptables: see the man page for
259 iptables(8). This table is used for various packet alterations
260 which can effect how the packet is routed.
261
262 To compile it as a module, choose M here. If unsure, say N.
263
264config IP_NF_TARGET_CLUSTERIP
265 tristate "CLUSTERIP target support"
266 depends on IP_NF_MANGLE
267 depends on NF_CONNTRACK
268 depends on NETFILTER_ADVANCED
269 select NF_CONNTRACK_MARK
270 select NETFILTER_FAMILY_ARP
271 help
272 The CLUSTERIP target allows you to build load-balancing clusters of
273 network servers without having a dedicated load-balancing
274 router/server/switch.
275
276 To compile it as a module, choose M here. If unsure, say N.
277
278config IP_NF_TARGET_ECN
279 tristate "ECN target support"
280 depends on IP_NF_MANGLE
281 depends on NETFILTER_ADVANCED
282 ---help---
283 This option adds a `ECN' target, which can be used in the iptables mangle
284 table.
285
286 You can use this target to remove the ECN bits from the IPv4 header of
287 an IP packet. This is particularly useful, if you need to work around
288 existing ECN blackholes on the internet, but don't want to disable
289 ECN support in general.
290
291 To compile it as a module, choose M here. If unsure, say N.
292
293config IP_NF_TARGET_TTL
294 tristate '"TTL" target support'
295 depends on NETFILTER_ADVANCED && IP_NF_MANGLE
296 select NETFILTER_XT_TARGET_HL
297 ---help---
298 This is a backwards-compatible option for the user's convenience
299 (e.g. when running oldconfig). It selects
300 CONFIG_NETFILTER_XT_TARGET_HL.
301
302# raw + specific targets
303config IP_NF_RAW
304 tristate 'raw table support (required for NOTRACK/TRACE)'
305 help
306 This option adds a `raw' table to iptables. This table is the very
307 first in the netfilter framework and hooks in at the PREROUTING
308 and OUTPUT chains.
309
310 If you want to compile it as a module, say M here and read
311 <file:Documentation/kbuild/modules.rst>. If unsure, say `N'.
312
313# security table for MAC policy
314config IP_NF_SECURITY
315 tristate "Security table"
316 depends on SECURITY
317 depends on NETFILTER_ADVANCED
318 help
319 This option adds a `security' table to iptables, for use
320 with Mandatory Access Control (MAC) policy.
321
322 If unsure, say N.
323
324endif # IP_NF_IPTABLES
325
326# ARP tables
327config IP_NF_ARPTABLES
328 tristate "ARP tables support"
329 select NETFILTER_XTABLES
330 select NETFILTER_FAMILY_ARP
331 depends on NETFILTER_ADVANCED
332 help
333 arptables is a general, extensible packet identification framework.
334 The ARP packet filtering and mangling (manipulation)subsystems
335 use this: say Y or M here if you want to use either of those.
336
337 To compile it as a module, choose M here. If unsure, say N.
338
339if IP_NF_ARPTABLES
340
341config IP_NF_ARPFILTER
342 tristate "ARP packet filtering"
343 help
344 ARP packet filtering defines a table `filter', which has a series of
345 rules for simple ARP packet filtering at local input and
346 local output. On a bridge, you can also specify filtering rules
347 for forwarded ARP packets. See the man page for arptables(8).
348
349 To compile it as a module, choose M here. If unsure, say N.
350
351config IP_NF_ARP_MANGLE
352 tristate "ARP payload mangling"
353 help
354 Allows altering the ARP packet payload: source and destination
355 hardware and network addresses.
356
357endif # IP_NF_ARPTABLES
358
359endmenu
360
1# SPDX-License-Identifier: GPL-2.0-only
2#
3# IP netfilter configuration
4#
5
6menu "IP: Netfilter Configuration"
7 depends on INET && NETFILTER
8
9config NF_DEFRAG_IPV4
10 tristate
11 default n
12
13config NF_SOCKET_IPV4
14 tristate "IPv4 socket lookup support"
15 help
16 This option enables the IPv4 socket lookup infrastructure. This is
17 is required by the {ip,nf}tables socket match.
18
19config NF_TPROXY_IPV4
20 tristate "IPv4 tproxy support"
21
22if NF_TABLES
23
24config NF_TABLES_IPV4
25 bool "IPv4 nf_tables support"
26 help
27 This option enables the IPv4 support for nf_tables.
28
29if NF_TABLES_IPV4
30
31config NFT_REJECT_IPV4
32 select NF_REJECT_IPV4
33 default NFT_REJECT
34 tristate
35
36config NFT_DUP_IPV4
37 tristate "IPv4 nf_tables packet duplication support"
38 depends on !NF_CONNTRACK || NF_CONNTRACK
39 select NF_DUP_IPV4
40 help
41 This module enables IPv4 packet duplication support for nf_tables.
42
43config NFT_FIB_IPV4
44 select NFT_FIB
45 tristate "nf_tables fib / ip route lookup support"
46 help
47 This module enables IPv4 FIB lookups, e.g. for reverse path filtering.
48 It also allows query of the FIB for the route type, e.g. local, unicast,
49 multicast or blackhole.
50
51endif # NF_TABLES_IPV4
52
53config NF_TABLES_ARP
54 bool "ARP nf_tables support"
55 select NETFILTER_FAMILY_ARP
56 help
57 This option enables the ARP support for nf_tables.
58
59endif # NF_TABLES
60
61config NF_FLOW_TABLE_IPV4
62 tristate "Netfilter flow table IPv4 module"
63 depends on NF_FLOW_TABLE
64 help
65 This option adds the flow table IPv4 support.
66
67 To compile it as a module, choose M here.
68
69config NF_DUP_IPV4
70 tristate "Netfilter IPv4 packet duplication to alternate destination"
71 depends on !NF_CONNTRACK || NF_CONNTRACK
72 help
73 This option enables the nf_dup_ipv4 core, which duplicates an IPv4
74 packet to be rerouted to another destination.
75
76config NF_LOG_ARP
77 tristate "ARP packet logging"
78 default m if NETFILTER_ADVANCED=n
79 select NF_LOG_COMMON
80
81config NF_LOG_IPV4
82 tristate "IPv4 packet logging"
83 default m if NETFILTER_ADVANCED=n
84 select NF_LOG_COMMON
85
86config NF_REJECT_IPV4
87 tristate "IPv4 packet rejection"
88 default m if NETFILTER_ADVANCED=n
89
90if NF_NAT
91config NF_NAT_SNMP_BASIC
92 tristate "Basic SNMP-ALG support"
93 depends on NF_CONNTRACK_SNMP
94 depends on NETFILTER_ADVANCED
95 default NF_NAT && NF_CONNTRACK_SNMP
96 select ASN1
97 help
98
99 This module implements an Application Layer Gateway (ALG) for
100 SNMP payloads. In conjunction with NAT, it allows a network
101 management system to access multiple private networks with
102 conflicting addresses. It works by modifying IP addresses
103 inside SNMP payloads to match IP-layer NAT mapping.
104
105 This is the "basic" form of SNMP-ALG, as described in RFC 2962
106
107 To compile it as a module, choose M here. If unsure, say N.
108
109config NF_NAT_PPTP
110 tristate
111 depends on NF_CONNTRACK
112 default NF_CONNTRACK_PPTP
113
114config NF_NAT_H323
115 tristate
116 depends on NF_CONNTRACK
117 default NF_CONNTRACK_H323
118
119endif # NF_NAT
120
121config IP_NF_IPTABLES
122 tristate "IP tables support (required for filtering/masq/NAT)"
123 default m if NETFILTER_ADVANCED=n
124 select NETFILTER_XTABLES
125 help
126 iptables is a general, extensible packet identification framework.
127 The packet filtering and full NAT (masquerading, port forwarding,
128 etc) subsystems now use this: say `Y' or `M' here if you want to use
129 either of those.
130
131 To compile it as a module, choose M here. If unsure, say N.
132
133if IP_NF_IPTABLES
134
135# The matches.
136config IP_NF_MATCH_AH
137 tristate '"ah" match support'
138 depends on NETFILTER_ADVANCED
139 help
140 This match extension allows you to match a range of SPIs
141 inside AH header of IPSec packets.
142
143 To compile it as a module, choose M here. If unsure, say N.
144
145config IP_NF_MATCH_ECN
146 tristate '"ecn" match support'
147 depends on NETFILTER_ADVANCED
148 select NETFILTER_XT_MATCH_ECN
149 help
150 This is a backwards-compat option for the user's convenience
151 (e.g. when running oldconfig). It selects
152 CONFIG_NETFILTER_XT_MATCH_ECN.
153
154config IP_NF_MATCH_RPFILTER
155 tristate '"rpfilter" reverse path filter match support'
156 depends on NETFILTER_ADVANCED
157 depends on IP_NF_MANGLE || IP_NF_RAW
158 help
159 This option allows you to match packets whose replies would
160 go out via the interface the packet came in.
161
162 To compile it as a module, choose M here. If unsure, say N.
163 The module will be called ipt_rpfilter.
164
165config IP_NF_MATCH_TTL
166 tristate '"ttl" match support'
167 depends on NETFILTER_ADVANCED
168 select NETFILTER_XT_MATCH_HL
169 help
170 This is a backwards-compat option for the user's convenience
171 (e.g. when running oldconfig). It selects
172 CONFIG_NETFILTER_XT_MATCH_HL.
173
174# `filter', generic and specific targets
175config IP_NF_FILTER
176 tristate "Packet filtering"
177 default m if NETFILTER_ADVANCED=n
178 help
179 Packet filtering defines a table `filter', which has a series of
180 rules for simple packet filtering at local input, forwarding and
181 local output. See the man page for iptables(8).
182
183 To compile it as a module, choose M here. If unsure, say N.
184
185config IP_NF_TARGET_REJECT
186 tristate "REJECT target support"
187 depends on IP_NF_FILTER
188 select NF_REJECT_IPV4
189 default m if NETFILTER_ADVANCED=n
190 help
191 The REJECT target allows a filtering rule to specify that an ICMP
192 error should be issued in response to an incoming packet, rather
193 than silently being dropped.
194
195 To compile it as a module, choose M here. If unsure, say N.
196
197config IP_NF_TARGET_SYNPROXY
198 tristate "SYNPROXY target support"
199 depends on NF_CONNTRACK && NETFILTER_ADVANCED
200 select NETFILTER_SYNPROXY
201 select SYN_COOKIES
202 help
203 The SYNPROXY target allows you to intercept TCP connections and
204 establish them using syncookies before they are passed on to the
205 server. This allows to avoid conntrack and server resource usage
206 during SYN-flood attacks.
207
208 To compile it as a module, choose M here. If unsure, say N.
209
210# NAT + specific targets: nf_conntrack
211config IP_NF_NAT
212 tristate "iptables NAT support"
213 depends on NF_CONNTRACK
214 default m if NETFILTER_ADVANCED=n
215 select NF_NAT
216 select NETFILTER_XT_NAT
217 help
218 This enables the `nat' table in iptables. This allows masquerading,
219 port forwarding and other forms of full Network Address Port
220 Translation.
221
222 To compile it as a module, choose M here. If unsure, say N.
223
224if IP_NF_NAT
225
226config IP_NF_TARGET_MASQUERADE
227 tristate "MASQUERADE target support"
228 select NETFILTER_XT_TARGET_MASQUERADE
229 help
230 This is a backwards-compat option for the user's convenience
231 (e.g. when running oldconfig). It selects NETFILTER_XT_TARGET_MASQUERADE.
232
233config IP_NF_TARGET_NETMAP
234 tristate "NETMAP target support"
235 depends on NETFILTER_ADVANCED
236 select NETFILTER_XT_TARGET_NETMAP
237 help
238 This is a backwards-compat option for the user's convenience
239 (e.g. when running oldconfig). It selects
240 CONFIG_NETFILTER_XT_TARGET_NETMAP.
241
242config IP_NF_TARGET_REDIRECT
243 tristate "REDIRECT target support"
244 depends on NETFILTER_ADVANCED
245 select NETFILTER_XT_TARGET_REDIRECT
246 help
247 This is a backwards-compat option for the user's convenience
248 (e.g. when running oldconfig). It selects
249 CONFIG_NETFILTER_XT_TARGET_REDIRECT.
250
251endif # IP_NF_NAT
252
253# mangle + specific targets
254config IP_NF_MANGLE
255 tristate "Packet mangling"
256 default m if NETFILTER_ADVANCED=n
257 help
258 This option adds a `mangle' table to iptables: see the man page for
259 iptables(8). This table is used for various packet alterations
260 which can effect how the packet is routed.
261
262 To compile it as a module, choose M here. If unsure, say N.
263
264config IP_NF_TARGET_CLUSTERIP
265 tristate "CLUSTERIP target support"
266 depends on IP_NF_MANGLE
267 depends on NF_CONNTRACK
268 depends on NETFILTER_ADVANCED
269 select NF_CONNTRACK_MARK
270 select NETFILTER_FAMILY_ARP
271 help
272 The CLUSTERIP target allows you to build load-balancing clusters of
273 network servers without having a dedicated load-balancing
274 router/server/switch.
275
276 To compile it as a module, choose M here. If unsure, say N.
277
278config IP_NF_TARGET_ECN
279 tristate "ECN target support"
280 depends on IP_NF_MANGLE
281 depends on NETFILTER_ADVANCED
282 help
283 This option adds a `ECN' target, which can be used in the iptables mangle
284 table.
285
286 You can use this target to remove the ECN bits from the IPv4 header of
287 an IP packet. This is particularly useful, if you need to work around
288 existing ECN blackholes on the internet, but don't want to disable
289 ECN support in general.
290
291 To compile it as a module, choose M here. If unsure, say N.
292
293config IP_NF_TARGET_TTL
294 tristate '"TTL" target support'
295 depends on NETFILTER_ADVANCED && IP_NF_MANGLE
296 select NETFILTER_XT_TARGET_HL
297 help
298 This is a backwards-compatible option for the user's convenience
299 (e.g. when running oldconfig). It selects
300 CONFIG_NETFILTER_XT_TARGET_HL.
301
302# raw + specific targets
303config IP_NF_RAW
304 tristate 'raw table support (required for NOTRACK/TRACE)'
305 help
306 This option adds a `raw' table to iptables. This table is the very
307 first in the netfilter framework and hooks in at the PREROUTING
308 and OUTPUT chains.
309
310 If you want to compile it as a module, say M here and read
311 <file:Documentation/kbuild/modules.rst>. If unsure, say `N'.
312
313# security table for MAC policy
314config IP_NF_SECURITY
315 tristate "Security table"
316 depends on SECURITY
317 depends on NETFILTER_ADVANCED
318 help
319 This option adds a `security' table to iptables, for use
320 with Mandatory Access Control (MAC) policy.
321
322 If unsure, say N.
323
324endif # IP_NF_IPTABLES
325
326# ARP tables
327config IP_NF_ARPTABLES
328 tristate "ARP tables support"
329 select NETFILTER_XTABLES
330 select NETFILTER_FAMILY_ARP
331 depends on NETFILTER_ADVANCED
332 help
333 arptables is a general, extensible packet identification framework.
334 The ARP packet filtering and mangling (manipulation)subsystems
335 use this: say Y or M here if you want to use either of those.
336
337 To compile it as a module, choose M here. If unsure, say N.
338
339if IP_NF_ARPTABLES
340
341config IP_NF_ARPFILTER
342 tristate "ARP packet filtering"
343 help
344 ARP packet filtering defines a table `filter', which has a series of
345 rules for simple ARP packet filtering at local input and
346 local output. On a bridge, you can also specify filtering rules
347 for forwarded ARP packets. See the man page for arptables(8).
348
349 To compile it as a module, choose M here. If unsure, say N.
350
351config IP_NF_ARP_MANGLE
352 tristate "ARP payload mangling"
353 help
354 Allows altering the ARP packet payload: source and destination
355 hardware and network addresses.
356
357endif # IP_NF_ARPTABLES
358
359endmenu
360