2 # IP netfilter configuration
5 menu "IP: Netfilter Configuration"
6 depends on INET && NETFILTER
12 config NF_CONNTRACK_IPV4
13 tristate "IPv4 connection tracking support (required for NAT)"
14 depends on NF_CONNTRACK
15 default m if NETFILTER_ADVANCED=n
18 Connection tracking keeps a record of what packets have passed
19 through your machine, in order to figure out how they are related
22 This is IPv4 support on Layer 3 independent connection tracking.
23 Layer 3 independent connection tracking is experimental scheme
24 which generalize ip_conntrack to support other layer 3 protocols.
26 To compile it as a module, choose M here. If unsure, say N.
28 config NF_CONNTRACK_PROC_COMPAT
29 bool "proc/sysctl compatibility with old connection tracking"
30 depends on NF_CONNTRACK_PROCFS && NF_CONNTRACK_IPV4
33 This option enables /proc and sysctl compatibility with the old
34 layer 3 dependent connection tracking. This is needed to keep
35 old programs that have not been adapted to the new names working.
41 tristate "IPv4 nf_tables support"
43 This option enables the IPv4 support for nf_tables.
45 config NFT_CHAIN_ROUTE_IPV4
46 depends on NF_TABLES_IPV4
47 tristate "IPv4 nf_tables route chain support"
49 This option enables the "route" chain for IPv4 in nf_tables. This
50 chain type is used to force packet re-routing after mangling header
51 fields such as the source, destination, type of service and
54 config NFT_CHAIN_NAT_IPV4
55 depends on NF_TABLES_IPV4
56 depends on NF_NAT_IPV4 && NFT_NAT
57 tristate "IPv4 nf_tables nat chain support"
59 This option enables the "nat" chain for IPv4 in nf_tables. This
60 chain type is used to perform Network Address Translation (NAT)
61 packet transformations such as the source, destination address and
62 source and destination ports.
66 tristate "ARP nf_tables support"
68 This option enables the ARP support for nf_tables.
71 tristate "IP tables support (required for filtering/masq/NAT)"
72 default m if NETFILTER_ADVANCED=n
73 select NETFILTER_XTABLES
75 iptables is a general, extensible packet identification framework.
76 The packet filtering and full NAT (masquerading, port forwarding,
77 etc) subsystems now use this: say `Y' or `M' here if you want to use
80 To compile it as a module, choose M here. If unsure, say N.
86 tristate '"ah" match support'
87 depends on NETFILTER_ADVANCED
89 This match extension allows you to match a range of SPIs
90 inside AH header of IPSec packets.
92 To compile it as a module, choose M here. If unsure, say N.
94 config IP_NF_MATCH_ECN
95 tristate '"ecn" match support'
96 depends on NETFILTER_ADVANCED
97 select NETFILTER_XT_MATCH_ECN
99 This is a backwards-compat option for the user's convenience
100 (e.g. when running oldconfig). It selects
101 CONFIG_NETFILTER_XT_MATCH_ECN.
103 config IP_NF_MATCH_RPFILTER
104 tristate '"rpfilter" reverse path filter match support'
105 depends on NETFILTER_ADVANCED && (IP_NF_MANGLE || IP_NF_RAW)
107 This option allows you to match packets whose replies would
108 go out via the interface the packet came in.
110 To compile it as a module, choose M here. If unsure, say N.
111 The module will be called ipt_rpfilter.
113 config IP_NF_MATCH_TTL
114 tristate '"ttl" match support'
115 depends on NETFILTER_ADVANCED
116 select NETFILTER_XT_MATCH_HL
118 This is a backwards-compat option for the user's convenience
119 (e.g. when running oldconfig). It selects
120 CONFIG_NETFILTER_XT_MATCH_HL.
122 # `filter', generic and specific targets
124 tristate "Packet filtering"
125 default m if NETFILTER_ADVANCED=n
127 Packet filtering defines a table `filter', which has a series of
128 rules for simple packet filtering at local input, forwarding and
129 local output. See the man page for iptables(8).
131 To compile it as a module, choose M here. If unsure, say N.
133 config IP_NF_TARGET_REJECT
134 tristate "REJECT target support"
135 depends on IP_NF_FILTER
136 default m if NETFILTER_ADVANCED=n
138 The REJECT target allows a filtering rule to specify that an ICMP
139 error should be issued in response to an incoming packet, rather
140 than silently being dropped.
142 To compile it as a module, choose M here. If unsure, say N.
144 config IP_NF_TARGET_SYNPROXY
145 tristate "SYNPROXY target support"
146 depends on NF_CONNTRACK && NETFILTER_ADVANCED
147 select NETFILTER_SYNPROXY
150 The SYNPROXY target allows you to intercept TCP connections and
151 establish them using syncookies before they are passed on to the
152 server. This allows to avoid conntrack and server resource usage
153 during SYN-flood attacks.
155 To compile it as a module, choose M here. If unsure, say N.
157 config IP_NF_TARGET_ULOG
158 tristate "ULOG target support (obsolete)"
159 default m if NETFILTER_ADVANCED=n
162 This option enables the old IPv4-only "ipt_ULOG" implementation
163 which has been obsoleted by the new "nfnetlink_log" code (see
164 CONFIG_NETFILTER_NETLINK_LOG).
166 This option adds a `ULOG' target, which allows you to create rules in
167 any iptables table. The packet is passed to a userspace logging
168 daemon using netlink multicast sockets; unlike the LOG target
169 which can only be viewed through syslog.
171 The appropriate userspace logging daemon (ulogd) may be obtained from
172 <http://www.netfilter.org/projects/ulogd/index.html>
174 To compile it as a module, choose M here. If unsure, say N.
176 # NAT + specific targets: nf_conntrack
179 depends on NF_CONNTRACK_IPV4
180 default m if NETFILTER_ADVANCED=n
183 The IPv4 NAT option allows masquerading, port forwarding and other
184 forms of full Network Address Port Translation. It is controlled by
185 the `nat' table in iptables: see the man page for iptables(8).
187 To compile it as a module, choose M here. If unsure, say N.
191 config IP_NF_TARGET_MASQUERADE
192 tristate "MASQUERADE target support"
193 default m if NETFILTER_ADVANCED=n
195 Masquerading is a special case of NAT: all outgoing connections are
196 changed to seem to come from a particular interface's address, and
197 if the interface goes down, those connections are lost. This is
198 only useful for dialup accounts with dynamic IP address (ie. your IP
199 address will be different on next dialup).
201 To compile it as a module, choose M here. If unsure, say N.
203 config IP_NF_TARGET_NETMAP
204 tristate "NETMAP target support"
205 depends on NETFILTER_ADVANCED
206 select NETFILTER_XT_TARGET_NETMAP
208 This is a backwards-compat option for the user's convenience
209 (e.g. when running oldconfig). It selects
210 CONFIG_NETFILTER_XT_TARGET_NETMAP.
212 config IP_NF_TARGET_REDIRECT
213 tristate "REDIRECT target support"
214 depends on NETFILTER_ADVANCED
215 select NETFILTER_XT_TARGET_REDIRECT
217 This is a backwards-compat option for the user's convenience
218 (e.g. when running oldconfig). It selects
219 CONFIG_NETFILTER_XT_TARGET_REDIRECT.
223 config NF_NAT_SNMP_BASIC
224 tristate "Basic SNMP-ALG support"
225 depends on NF_CONNTRACK_SNMP && NF_NAT_IPV4
226 depends on NETFILTER_ADVANCED
227 default NF_NAT && NF_CONNTRACK_SNMP
230 This module implements an Application Layer Gateway (ALG) for
231 SNMP payloads. In conjunction with NAT, it allows a network
232 management system to access multiple private networks with
233 conflicting addresses. It works by modifying IP addresses
234 inside SNMP payloads to match IP-layer NAT mapping.
236 This is the "basic" form of SNMP-ALG, as described in RFC 2962
238 To compile it as a module, choose M here. If unsure, say N.
240 # If they want FTP, set to $CONFIG_IP_NF_NAT (m or y),
241 # or $CONFIG_IP_NF_FTP (m or y), whichever is weaker.
242 # From kconfig-language.txt:
244 # <expr> '&&' <expr> (6)
246 # (6) Returns the result of min(/expr/, /expr/).
248 config NF_NAT_PROTO_GRE
250 depends on NF_NAT_IPV4 && NF_CT_PROTO_GRE
254 depends on NF_CONNTRACK && NF_NAT_IPV4
255 default NF_NAT_IPV4 && NF_CONNTRACK_PPTP
256 select NF_NAT_PROTO_GRE
260 depends on NF_CONNTRACK && NF_NAT_IPV4
261 default NF_NAT_IPV4 && NF_CONNTRACK_H323
263 # mangle + specific targets
265 tristate "Packet mangling"
266 default m if NETFILTER_ADVANCED=n
268 This option adds a `mangle' table to iptables: see the man page for
269 iptables(8). This table is used for various packet alterations
270 which can effect how the packet is routed.
272 To compile it as a module, choose M here. If unsure, say N.
274 config IP_NF_TARGET_CLUSTERIP
275 tristate "CLUSTERIP target support"
276 depends on IP_NF_MANGLE
277 depends on NF_CONNTRACK_IPV4
278 depends on NETFILTER_ADVANCED
279 select NF_CONNTRACK_MARK
281 The CLUSTERIP target allows you to build load-balancing clusters of
282 network servers without having a dedicated load-balancing
283 router/server/switch.
285 To compile it as a module, choose M here. If unsure, say N.
287 config IP_NF_TARGET_ECN
288 tristate "ECN target support"
289 depends on IP_NF_MANGLE
290 depends on NETFILTER_ADVANCED
292 This option adds a `ECN' target, which can be used in the iptables mangle
295 You can use this target to remove the ECN bits from the IPv4 header of
296 an IP packet. This is particularly useful, if you need to work around
297 existing ECN blackholes on the internet, but don't want to disable
298 ECN support in general.
300 To compile it as a module, choose M here. If unsure, say N.
302 config IP_NF_TARGET_TTL
303 tristate '"TTL" target support'
304 depends on NETFILTER_ADVANCED && IP_NF_MANGLE
305 select NETFILTER_XT_TARGET_HL
307 This is a backwards-compatible option for the user's convenience
308 (e.g. when running oldconfig). It selects
309 CONFIG_NETFILTER_XT_TARGET_HL.
311 # raw + specific targets
313 tristate 'raw table support (required for NOTRACK/TRACE)'
315 This option adds a `raw' table to iptables. This table is the very
316 first in the netfilter framework and hooks in at the PREROUTING
319 If you want to compile it as a module, say M here and read
320 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
322 # security table for MAC policy
323 config IP_NF_SECURITY
324 tristate "Security table"
326 depends on NETFILTER_ADVANCED
328 This option adds a `security' table to iptables, for use
329 with Mandatory Access Control (MAC) policy.
333 endif # IP_NF_IPTABLES
336 config IP_NF_ARPTABLES
337 tristate "ARP tables support"
338 select NETFILTER_XTABLES
339 depends on NETFILTER_ADVANCED
341 arptables is a general, extensible packet identification framework.
342 The ARP packet filtering and mangling (manipulation)subsystems
343 use this: say Y or M here if you want to use either of those.
345 To compile it as a module, choose M here. If unsure, say N.
349 config IP_NF_ARPFILTER
350 tristate "ARP packet filtering"
352 ARP packet filtering defines a table `filter', which has a series of
353 rules for simple ARP packet filtering at local input and
354 local output. On a bridge, you can also specify filtering rules
355 for forwarded ARP packets. See the man page for arptables(8).
357 To compile it as a module, choose M here. If unsure, say N.
359 config IP_NF_ARP_MANGLE
360 tristate "ARP payload mangling"
362 Allows altering the ARP packet payload: source and destination
363 hardware and network addresses.
365 endif # IP_NF_ARPTABLES