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.
40 tristate "IP tables support (required for filtering/masq/NAT)"
41 default m if NETFILTER_ADVANCED=n
42 select NETFILTER_XTABLES
44 iptables is a general, extensible packet identification framework.
45 The packet filtering and full NAT (masquerading, port forwarding,
46 etc) subsystems now use this: say `Y' or `M' here if you want to use
49 To compile it as a module, choose M here. If unsure, say N.
55 tristate '"ah" match support'
56 depends on NETFILTER_ADVANCED
58 This match extension allows you to match a range of SPIs
59 inside AH header of IPSec packets.
61 To compile it as a module, choose M here. If unsure, say N.
63 config IP_NF_MATCH_ECN
64 tristate '"ecn" match support'
65 depends on NETFILTER_ADVANCED
66 select NETFILTER_XT_MATCH_ECN
68 This is a backwards-compat option for the user's convenience
69 (e.g. when running oldconfig). It selects
70 CONFIG_NETFILTER_XT_MATCH_ECN.
72 config IP_NF_MATCH_RPFILTER
73 tristate '"rpfilter" reverse path filter match support'
74 depends on NETFILTER_ADVANCED && (IP_NF_MANGLE || IP_NF_RAW)
76 This option allows you to match packets whose replies would
77 go out via the interface the packet came in.
79 To compile it as a module, choose M here. If unsure, say N.
80 The module will be called ipt_rpfilter.
82 config IP_NF_MATCH_TTL
83 tristate '"ttl" match support'
84 depends on NETFILTER_ADVANCED
85 select NETFILTER_XT_MATCH_HL
87 This is a backwards-compat option for the user's convenience
88 (e.g. when running oldconfig). It selects
89 CONFIG_NETFILTER_XT_MATCH_HL.
91 # `filter', generic and specific targets
93 tristate "Packet filtering"
94 default m if NETFILTER_ADVANCED=n
96 Packet filtering defines a table `filter', which has a series of
97 rules for simple packet filtering at local input, forwarding and
98 local output. See the man page for iptables(8).
100 To compile it as a module, choose M here. If unsure, say N.
102 config IP_NF_TARGET_REJECT
103 tristate "REJECT target support"
104 depends on IP_NF_FILTER
105 default m if NETFILTER_ADVANCED=n
107 The REJECT target allows a filtering rule to specify that an ICMP
108 error should be issued in response to an incoming packet, rather
109 than silently being dropped.
111 To compile it as a module, choose M here. If unsure, say N.
113 config IP_NF_TARGET_SYNPROXY
114 tristate "SYNPROXY target support"
115 depends on NF_CONNTRACK && NETFILTER_ADVANCED
116 select NETFILTER_SYNPROXY
119 The SYNPROXY target allows you to intercept TCP connections and
120 establish them using syncookies before they are passed on to the
121 server. This allows to avoid conntrack and server resource usage
122 during SYN-flood attacks.
124 To compile it as a module, choose M here. If unsure, say N.
126 config IP_NF_TARGET_ULOG
127 tristate "ULOG target support (obsolete)"
128 default m if NETFILTER_ADVANCED=n
131 This option enables the old IPv4-only "ipt_ULOG" implementation
132 which has been obsoleted by the new "nfnetlink_log" code (see
133 CONFIG_NETFILTER_NETLINK_LOG).
135 This option adds a `ULOG' target, which allows you to create rules in
136 any iptables table. The packet is passed to a userspace logging
137 daemon using netlink multicast sockets; unlike the LOG target
138 which can only be viewed through syslog.
140 The appropriate userspace logging daemon (ulogd) may be obtained from
141 <http://www.netfilter.org/projects/ulogd/index.html>
143 To compile it as a module, choose M here. If unsure, say N.
145 # NAT + specific targets: nf_conntrack
148 depends on NF_CONNTRACK_IPV4
149 default m if NETFILTER_ADVANCED=n
152 The IPv4 NAT option allows masquerading, port forwarding and other
153 forms of full Network Address Port Translation. It is controlled by
154 the `nat' table in iptables: see the man page for iptables(8).
156 To compile it as a module, choose M here. If unsure, say N.
160 config IP_NF_TARGET_MASQUERADE
161 tristate "MASQUERADE target support"
162 default m if NETFILTER_ADVANCED=n
164 Masquerading is a special case of NAT: all outgoing connections are
165 changed to seem to come from a particular interface's address, and
166 if the interface goes down, those connections are lost. This is
167 only useful for dialup accounts with dynamic IP address (ie. your IP
168 address will be different on next dialup).
170 To compile it as a module, choose M here. If unsure, say N.
172 config IP_NF_TARGET_NETMAP
173 tristate "NETMAP target support"
174 depends on NETFILTER_ADVANCED
175 select NETFILTER_XT_TARGET_NETMAP
177 This is a backwards-compat option for the user's convenience
178 (e.g. when running oldconfig). It selects
179 CONFIG_NETFILTER_XT_TARGET_NETMAP.
181 config IP_NF_TARGET_REDIRECT
182 tristate "REDIRECT target support"
183 depends on NETFILTER_ADVANCED
184 select NETFILTER_XT_TARGET_REDIRECT
186 This is a backwards-compat option for the user's convenience
187 (e.g. when running oldconfig). It selects
188 CONFIG_NETFILTER_XT_TARGET_REDIRECT.
192 config NF_NAT_SNMP_BASIC
193 tristate "Basic SNMP-ALG support"
194 depends on NF_CONNTRACK_SNMP && NF_NAT_IPV4
195 depends on NETFILTER_ADVANCED
196 default NF_NAT && NF_CONNTRACK_SNMP
199 This module implements an Application Layer Gateway (ALG) for
200 SNMP payloads. In conjunction with NAT, it allows a network
201 management system to access multiple private networks with
202 conflicting addresses. It works by modifying IP addresses
203 inside SNMP payloads to match IP-layer NAT mapping.
205 This is the "basic" form of SNMP-ALG, as described in RFC 2962
207 To compile it as a module, choose M here. If unsure, say N.
209 # If they want FTP, set to $CONFIG_IP_NF_NAT (m or y),
210 # or $CONFIG_IP_NF_FTP (m or y), whichever is weaker.
211 # From kconfig-language.txt:
213 # <expr> '&&' <expr> (6)
215 # (6) Returns the result of min(/expr/, /expr/).
217 config NF_NAT_PROTO_GRE
219 depends on NF_NAT_IPV4 && NF_CT_PROTO_GRE
223 depends on NF_CONNTRACK && NF_NAT_IPV4
224 default NF_NAT_IPV4 && NF_CONNTRACK_PPTP
225 select NF_NAT_PROTO_GRE
229 depends on NF_CONNTRACK && NF_NAT_IPV4
230 default NF_NAT_IPV4 && NF_CONNTRACK_H323
232 # mangle + specific targets
234 tristate "Packet mangling"
235 default m if NETFILTER_ADVANCED=n
237 This option adds a `mangle' table to iptables: see the man page for
238 iptables(8). This table is used for various packet alterations
239 which can effect how the packet is routed.
241 To compile it as a module, choose M here. If unsure, say N.
243 config IP_NF_TARGET_CLUSTERIP
244 tristate "CLUSTERIP target support"
245 depends on IP_NF_MANGLE
246 depends on NF_CONNTRACK_IPV4
247 depends on NETFILTER_ADVANCED
248 select NF_CONNTRACK_MARK
250 The CLUSTERIP target allows you to build load-balancing clusters of
251 network servers without having a dedicated load-balancing
252 router/server/switch.
254 To compile it as a module, choose M here. If unsure, say N.
256 config IP_NF_TARGET_ECN
257 tristate "ECN target support"
258 depends on IP_NF_MANGLE
259 depends on NETFILTER_ADVANCED
261 This option adds a `ECN' target, which can be used in the iptables mangle
264 You can use this target to remove the ECN bits from the IPv4 header of
265 an IP packet. This is particularly useful, if you need to work around
266 existing ECN blackholes on the internet, but don't want to disable
267 ECN support in general.
269 To compile it as a module, choose M here. If unsure, say N.
271 config IP_NF_TARGET_TTL
272 tristate '"TTL" target support'
273 depends on NETFILTER_ADVANCED && IP_NF_MANGLE
274 select NETFILTER_XT_TARGET_HL
276 This is a backwards-compatible option for the user's convenience
277 (e.g. when running oldconfig). It selects
278 CONFIG_NETFILTER_XT_TARGET_HL.
280 # raw + specific targets
282 tristate 'raw table support (required for NOTRACK/TRACE)'
284 This option adds a `raw' table to iptables. This table is the very
285 first in the netfilter framework and hooks in at the PREROUTING
288 If you want to compile it as a module, say M here and read
289 <file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
291 # security table for MAC policy
292 config IP_NF_SECURITY
293 tristate "Security table"
295 depends on NETFILTER_ADVANCED
297 This option adds a `security' table to iptables, for use
298 with Mandatory Access Control (MAC) policy.
302 endif # IP_NF_IPTABLES
305 config IP_NF_ARPTABLES
306 tristate "ARP tables support"
307 select NETFILTER_XTABLES
308 depends on NETFILTER_ADVANCED
310 arptables is a general, extensible packet identification framework.
311 The ARP packet filtering and mangling (manipulation)subsystems
312 use this: say Y or M here if you want to use either of those.
314 To compile it as a module, choose M here. If unsure, say N.
318 config IP_NF_ARPFILTER
319 tristate "ARP packet filtering"
321 ARP packet filtering defines a table `filter', which has a series of
322 rules for simple ARP packet filtering at local input and
323 local output. On a bridge, you can also specify filtering rules
324 for forwarded ARP packets. See the man page for arptables(8).
326 To compile it as a module, choose M here. If unsure, say N.
328 config IP_NF_ARP_MANGLE
329 tristate "ARP payload mangling"
331 Allows altering the ARP packet payload: source and destination
332 hardware and network addresses.
334 endif # IP_NF_ARPTABLES