498e5d5bbd40c4cae244089472d9a5a39e04747e
2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 static struct fw3_option default_opts
[] = {
23 FW3_OPT("input", target
, defaults
, policy_input
),
24 FW3_OPT("forward", target
, defaults
, policy_forward
),
25 FW3_OPT("output", target
, defaults
, policy_output
),
27 FW3_OPT("drop_invalid", bool, defaults
, drop_invalid
),
29 FW3_OPT("syn_flood", bool, defaults
, syn_flood
),
30 FW3_OPT("synflood_protect", bool, defaults
, syn_flood
),
31 FW3_OPT("synflood_rate", limit
, defaults
, syn_flood_rate
),
32 FW3_OPT("synflood_burst", int, defaults
, syn_flood_rate
.burst
),
34 FW3_OPT("tcp_syncookies", bool, defaults
, tcp_syncookies
),
35 FW3_OPT("tcp_ecn", bool, defaults
, tcp_ecn
),
36 FW3_OPT("tcp_westwood", bool, defaults
, tcp_westwood
),
37 FW3_OPT("tcp_window_scaling", bool, defaults
, tcp_window_scaling
),
39 FW3_OPT("accept_redirects", bool, defaults
, accept_redirects
),
40 FW3_OPT("accept_source_route", bool, defaults
, accept_source_route
),
42 FW3_OPT("custom_chains", bool, defaults
, custom_chains
),
43 FW3_OPT("disable_ipv6", bool, defaults
, disable_ipv6
),
48 check_policy(struct uci_element
*e
, enum fw3_target
*pol
, const char *name
)
50 if (*pol
== FW3_TARGET_UNSPEC
)
52 warn_elem(e
, "has no %s policy specified, defaulting to DROP", name
);
53 *pol
= FW3_TARGET_DROP
;
55 else if (*pol
> FW3_TARGET_DROP
)
57 warn_elem(e
, "has invalid %s policy, defaulting to DROP", name
);
58 *pol
= FW3_TARGET_DROP
;
63 fw3_load_defaults(struct fw3_state
*state
, struct uci_package
*p
)
65 struct uci_section
*s
;
66 struct uci_element
*e
;
67 struct fw3_defaults
*defs
= &state
->defaults
;
71 defs
->syn_flood_rate
.rate
= 25;
72 defs
->syn_flood_rate
.burst
= 50;
73 defs
->tcp_syncookies
= true;
74 defs
->tcp_window_scaling
= true;
75 defs
->custom_chains
= true;
77 uci_foreach_element(&p
->sections
, e
)
79 s
= uci_to_section(e
);
81 if (strcmp(s
->type
, "defaults"))
86 warn_elem(e
, "ignoring duplicate section");
90 fw3_parse_options(&state
->defaults
,
91 default_opts
, ARRAY_SIZE(default_opts
), s
);
93 check_policy(e
, &defs
->policy_input
, "input");
94 check_policy(e
, &defs
->policy_output
, "output");
95 check_policy(e
, &defs
->policy_forward
, "forward");
100 fw3_print_default_chains(enum fw3_table table
, enum fw3_family family
,
101 struct fw3_state
*state
)
103 struct fw3_defaults
*defs
= &state
->defaults
;
104 const char *policy
[] = {
116 case FW3_TABLE_FILTER
:
117 fw3_pr(":INPUT %s [0:0]\n", policy
[defs
->policy_input
]);
118 fw3_pr(":FORWARD %s [0:0]\n", policy
[defs
->policy_forward
]);
119 fw3_pr(":OUTPUT %s [0:0]\n", policy
[defs
->policy_output
]);
121 if (defs
->custom_chains
)
123 fw3_pr(":input_rule - [0:0]\n");
124 fw3_pr(":output_rule - [0:0]\n");
125 fw3_pr(":forwarding_rule - [0:0]\n");
128 fw3_pr(":delegate_input - [0:0]\n");
129 fw3_pr(":delegate_output - [0:0]\n");
130 fw3_pr(":delegate_forward - [0:0]\n");
131 fw3_pr(":reject - [0:0]\n");
132 fw3_pr(":syn_flood - [0:0]\n");
136 if (defs
->custom_chains
)
138 fw3_pr(":prerouting_rule - [0:0]\n");
139 fw3_pr(":postrouting_rule - [0:0]\n");
143 case FW3_TABLE_MANGLE
:
144 fw3_pr(":mssfix - [0:0]\n");
148 if (!defs
->drop_invalid
)
149 fw3_pr(":notrack - [0:0]\n");
155 fw3_print_default_rules(enum fw3_table table
, enum fw3_family family
,
156 struct fw3_state
*state
)
159 struct fw3_defaults
*defs
= &state
->defaults
;
160 const char *chains
[] = {
168 case FW3_TABLE_FILTER
:
169 fw3_pr("-A INPUT -i lo -j ACCEPT\n");
170 fw3_pr("-A OUTPUT -o lo -j ACCEPT\n");
172 for (i
= 0; i
< ARRAY_SIZE(chains
); i
++)
174 fw3_pr("-A %s -m conntrack --ctstate RELATED,ESTABLISHED "
175 "-j ACCEPT\n", chains
[i
]);
177 if (defs
->drop_invalid
)
179 fw3_pr("-A %s -m conntrack --ctstate INVALID -j DROP\n",
186 fw3_pr("-A syn_flood -p tcp --syn");
187 fw3_format_limit(&defs
->syn_flood_rate
);
188 fw3_pr(" -j RETURN\n");
190 fw3_pr("-A syn_flood -j DROP\n");
191 fw3_pr("-A INPUT -p tcp --syn -j syn_flood\n");
194 if (defs
->custom_chains
)
196 fw3_pr("-A INPUT -j input_rule\n");
197 fw3_pr("-A OUTPUT -j output_rule\n");
198 fw3_pr("-A FORWARD -j forwarding_rule\n");
201 fw3_pr("-A INPUT -j delegate_input\n");
202 fw3_pr("-A OUTPUT -j delegate_output\n");
203 fw3_pr("-A FORWARD -j delegate_forward\n");
205 fw3_pr("-A reject -p tcp -j REJECT --reject-with tcp-reset\n");
206 fw3_pr("-A reject -j REJECT --reject-with port-unreach\n");
208 if (defs
->policy_input
== FW3_TARGET_REJECT
)
209 fw3_pr("-A INPUT -j reject\n");
211 if (defs
->policy_output
== FW3_TARGET_REJECT
)
212 fw3_pr("-A OUTPUT -j reject\n");
214 if (defs
->policy_forward
== FW3_TARGET_REJECT
)
215 fw3_pr("-A FORWARD -j reject\n");
220 if (defs
->custom_chains
)
222 fw3_pr("-A PREROUTING -j prerouting_rule\n");
223 fw3_pr("-A POSTROUTING -j postrouting_rule\n");
227 case FW3_TABLE_MANGLE
:
228 fw3_pr("-A FORWARD -j mssfix\n");
232 if (!defs
->drop_invalid
)
233 fw3_pr("-A PREROUTING -j notrack\n");
239 fw3_print_flush_rules(enum fw3_table table
, enum fw3_family family
,
240 struct fw3_state
*state
, bool complete
)
244 case FW3_TABLE_FILTER
:
245 fw3_pr(":INPUT ACCEPT [0:0]\n");
246 fw3_pr(":OUTPUT ACCEPT [0:0]\n");
247 fw3_pr(":FORWARD ACCEPT [0:0]\n");
255 case FW3_TABLE_MANGLE
:
263 fw3_pr("-D FORWARD -j mssfix\n");
264 fw3_pr("-F mssfix\n");
265 fw3_pr("-X mssfix\n");
277 fw3_pr("-D PREROUTING -j notrack\n");
278 fw3_pr("-F notrack\n");
279 fw3_pr("-X notrack\n");