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Linux kernel mirror (for testing)
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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_DUP_IPV4
62 tristate "Netfilter IPv4 packet duplication to alternate destination"
63 depends on !NF_CONNTRACK || NF_CONNTRACK
64 help
65 This option enables the nf_dup_ipv4 core, which duplicates an IPv4
66 packet to be rerouted to another destination.
67
68config NF_LOG_ARP
69 tristate "ARP packet logging"
70 default m if NETFILTER_ADVANCED=n
71 select NF_LOG_SYSLOG
72 help
73 This is a backwards-compat option for the user's convenience
74 (e.g. when running oldconfig). It selects CONFIG_NF_LOG_SYSLOG.
75
76config NF_LOG_IPV4
77 tristate "IPv4 packet logging"
78 default m if NETFILTER_ADVANCED=n
79 select NF_LOG_SYSLOG
80 help
81 This is a backwards-compat option for the user's convenience
82 (e.g. when running oldconfig). It selects CONFIG_NF_LOG_SYSLOG.
83
84config NF_REJECT_IPV4
85 tristate "IPv4 packet rejection"
86 default m if NETFILTER_ADVANCED=n
87
88if NF_NAT
89config NF_NAT_SNMP_BASIC
90 tristate "Basic SNMP-ALG support"
91 depends on NF_CONNTRACK_SNMP
92 depends on NETFILTER_ADVANCED
93 default NF_NAT && NF_CONNTRACK_SNMP
94 select ASN1
95 help
96
97 This module implements an Application Layer Gateway (ALG) for
98 SNMP payloads. In conjunction with NAT, it allows a network
99 management system to access multiple private networks with
100 conflicting addresses. It works by modifying IP addresses
101 inside SNMP payloads to match IP-layer NAT mapping.
102
103 This is the "basic" form of SNMP-ALG, as described in RFC 2962
104
105 To compile it as a module, choose M here. If unsure, say N.
106
107config NF_NAT_PPTP
108 tristate
109 depends on NF_CONNTRACK
110 default NF_CONNTRACK_PPTP
111
112config NF_NAT_H323
113 tristate
114 depends on NF_CONNTRACK
115 default NF_CONNTRACK_H323
116
117endif # NF_NAT
118
119config IP_NF_IPTABLES
120 tristate "IP tables support (required for filtering/masq/NAT)"
121 default m if NETFILTER_ADVANCED=n
122 select NETFILTER_XTABLES
123 help
124 iptables is a general, extensible packet identification framework.
125 The packet filtering and full NAT (masquerading, port forwarding,
126 etc) subsystems now use this: say `Y' or `M' here if you want to use
127 either of those.
128
129 To compile it as a module, choose M here. If unsure, say N.
130
131if IP_NF_IPTABLES
132
133# The matches.
134config IP_NF_MATCH_AH
135 tristate '"ah" match support'
136 depends on NETFILTER_ADVANCED
137 help
138 This match extension allows you to match a range of SPIs
139 inside AH header of IPSec packets.
140
141 To compile it as a module, choose M here. If unsure, say N.
142
143config IP_NF_MATCH_ECN
144 tristate '"ecn" match support'
145 depends on NETFILTER_ADVANCED
146 select NETFILTER_XT_MATCH_ECN
147 help
148 This is a backwards-compat option for the user's convenience
149 (e.g. when running oldconfig). It selects
150 CONFIG_NETFILTER_XT_MATCH_ECN.
151
152config IP_NF_MATCH_RPFILTER
153 tristate '"rpfilter" reverse path filter match support'
154 depends on NETFILTER_ADVANCED
155 depends on IP_NF_MANGLE || IP_NF_RAW
156 help
157 This option allows you to match packets whose replies would
158 go out via the interface the packet came in.
159
160 To compile it as a module, choose M here. If unsure, say N.
161 The module will be called ipt_rpfilter.
162
163config IP_NF_MATCH_TTL
164 tristate '"ttl" match support'
165 depends on NETFILTER_ADVANCED
166 select NETFILTER_XT_MATCH_HL
167 help
168 This is a backwards-compat option for the user's convenience
169 (e.g. when running oldconfig). It selects
170 CONFIG_NETFILTER_XT_MATCH_HL.
171
172# `filter', generic and specific targets
173config IP_NF_FILTER
174 tristate "Packet filtering"
175 default m if NETFILTER_ADVANCED=n
176 help
177 Packet filtering defines a table `filter', which has a series of
178 rules for simple packet filtering at local input, forwarding and
179 local output. See the man page for iptables(8).
180
181 To compile it as a module, choose M here. If unsure, say N.
182
183config IP_NF_TARGET_REJECT
184 tristate "REJECT target support"
185 depends on IP_NF_FILTER
186 select NF_REJECT_IPV4
187 default m if NETFILTER_ADVANCED=n
188 help
189 The REJECT target allows a filtering rule to specify that an ICMP
190 error should be issued in response to an incoming packet, rather
191 than silently being dropped.
192
193 To compile it as a module, choose M here. If unsure, say N.
194
195config IP_NF_TARGET_SYNPROXY
196 tristate "SYNPROXY target support"
197 depends on NF_CONNTRACK && NETFILTER_ADVANCED
198 select NETFILTER_SYNPROXY
199 select SYN_COOKIES
200 help
201 The SYNPROXY target allows you to intercept TCP connections and
202 establish them using syncookies before they are passed on to the
203 server. This allows to avoid conntrack and server resource usage
204 during SYN-flood attacks.
205
206 To compile it as a module, choose M here. If unsure, say N.
207
208# NAT + specific targets: nf_conntrack
209config IP_NF_NAT
210 tristate "iptables NAT support"
211 depends on NF_CONNTRACK
212 default m if NETFILTER_ADVANCED=n
213 select NF_NAT
214 select NETFILTER_XT_NAT
215 help
216 This enables the `nat' table in iptables. This allows masquerading,
217 port forwarding and other forms of full Network Address Port
218 Translation.
219
220 To compile it as a module, choose M here. If unsure, say N.
221
222if IP_NF_NAT
223
224config IP_NF_TARGET_MASQUERADE
225 tristate "MASQUERADE target support"
226 select NETFILTER_XT_TARGET_MASQUERADE
227 help
228 This is a backwards-compat option for the user's convenience
229 (e.g. when running oldconfig). It selects NETFILTER_XT_TARGET_MASQUERADE.
230
231config IP_NF_TARGET_NETMAP
232 tristate "NETMAP target support"
233 depends on NETFILTER_ADVANCED
234 select NETFILTER_XT_TARGET_NETMAP
235 help
236 This is a backwards-compat option for the user's convenience
237 (e.g. when running oldconfig). It selects
238 CONFIG_NETFILTER_XT_TARGET_NETMAP.
239
240config IP_NF_TARGET_REDIRECT
241 tristate "REDIRECT target support"
242 depends on NETFILTER_ADVANCED
243 select NETFILTER_XT_TARGET_REDIRECT
244 help
245 This is a backwards-compat option for the user's convenience
246 (e.g. when running oldconfig). It selects
247 CONFIG_NETFILTER_XT_TARGET_REDIRECT.
248
249endif # IP_NF_NAT
250
251# mangle + specific targets
252config IP_NF_MANGLE
253 tristate "Packet mangling"
254 default m if NETFILTER_ADVANCED=n
255 help
256 This option adds a `mangle' table to iptables: see the man page for
257 iptables(8). This table is used for various packet alterations
258 which can effect how the packet is routed.
259
260 To compile it as a module, choose M here. If unsure, say N.
261
262config IP_NF_TARGET_ECN
263 tristate "ECN target support"
264 depends on IP_NF_MANGLE
265 depends on NETFILTER_ADVANCED
266 help
267 This option adds a `ECN' target, which can be used in the iptables mangle
268 table.
269
270 You can use this target to remove the ECN bits from the IPv4 header of
271 an IP packet. This is particularly useful, if you need to work around
272 existing ECN blackholes on the internet, but don't want to disable
273 ECN support in general.
274
275 To compile it as a module, choose M here. If unsure, say N.
276
277config IP_NF_TARGET_TTL
278 tristate '"TTL" target support'
279 depends on NETFILTER_ADVANCED && IP_NF_MANGLE
280 select NETFILTER_XT_TARGET_HL
281 help
282 This is a backwards-compatible option for the user's convenience
283 (e.g. when running oldconfig). It selects
284 CONFIG_NETFILTER_XT_TARGET_HL.
285
286# raw + specific targets
287config IP_NF_RAW
288 tristate 'raw table support (required for NOTRACK/TRACE)'
289 help
290 This option adds a `raw' table to iptables. This table is the very
291 first in the netfilter framework and hooks in at the PREROUTING
292 and OUTPUT chains.
293
294 If you want to compile it as a module, say M here and read
295 <file:Documentation/kbuild/modules.rst>. If unsure, say `N'.
296
297# security table for MAC policy
298config IP_NF_SECURITY
299 tristate "Security table"
300 depends on SECURITY
301 depends on NETFILTER_ADVANCED
302 help
303 This option adds a `security' table to iptables, for use
304 with Mandatory Access Control (MAC) policy.
305
306 If unsure, say N.
307
308endif # IP_NF_IPTABLES
309
310# ARP tables
311config IP_NF_ARPTABLES
312 tristate "ARP tables support"
313 select NETFILTER_XTABLES
314 select NETFILTER_FAMILY_ARP
315 depends on NETFILTER_ADVANCED
316 help
317 arptables is a general, extensible packet identification framework.
318 The ARP packet filtering and mangling (manipulation)subsystems
319 use this: say Y or M here if you want to use either of those.
320
321 To compile it as a module, choose M here. If unsure, say N.
322
323if IP_NF_ARPTABLES
324
325config IP_NF_ARPFILTER
326 tristate "ARP packet filtering"
327 help
328 ARP packet filtering defines a table `filter', which has a series of
329 rules for simple ARP packet filtering at local input and
330 local output. On a bridge, you can also specify filtering rules
331 for forwarded ARP packets. See the man page for arptables(8).
332
333 To compile it as a module, choose M here. If unsure, say N.
334
335config IP_NF_ARP_MANGLE
336 tristate "ARP payload mangling"
337 help
338 Allows altering the ARP packet payload: source and destination
339 hardware and network addresses.
340
341endif # IP_NF_ARPTABLES
342
343endmenu
344