434d758cef985441525da20194ab5b5607036631
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.
23 #define C(f, tbl, tgt, name) \
24 { FW3_FAMILY_##f, FW3_TABLE_##tbl, FW3_TARGET_##tgt, name }
27 enum fw3_family family
;
29 enum fw3_target target
;
33 static const struct chain src_chains
[] = {
34 C(ANY
, FILTER
, UNSPEC
, "zone_%s_input"),
35 C(ANY
, FILTER
, UNSPEC
, "zone_%s_output"),
36 C(ANY
, FILTER
, UNSPEC
, "zone_%s_forward"),
38 C(ANY
, FILTER
, ACCEPT
, "zone_%s_src_ACCEPT"),
39 C(ANY
, FILTER
, REJECT
, "zone_%s_src_REJECT"),
40 C(ANY
, FILTER
, DROP
, "zone_%s_src_DROP"),
43 static const struct chain dst_chains
[] = {
44 C(ANY
, FILTER
, ACCEPT
, "zone_%s_dest_ACCEPT"),
45 C(ANY
, FILTER
, REJECT
, "zone_%s_dest_REJECT"),
46 C(ANY
, FILTER
, DROP
, "zone_%s_dest_DROP"),
48 C(V4
, NAT
, SNAT
, "zone_%s_postrouting"),
49 C(V4
, NAT
, DNAT
, "zone_%s_prerouting"),
51 C(ANY
, RAW
, NOTRACK
, "zone_%s_notrack"),
54 static struct fw3_option zone_opts
[] = {
55 FW3_OPT("name", string
, zone
, name
),
57 FW3_LIST("network", device
, zone
, networks
),
58 FW3_LIST("device", device
, zone
, devices
),
59 FW3_LIST("subnet", address
, zone
, subnets
),
61 FW3_OPT("input", target
, zone
, policy_input
),
62 FW3_OPT("forward", target
, zone
, policy_forward
),
63 FW3_OPT("output", target
, zone
, policy_output
),
65 FW3_OPT("masq", bool, zone
, masq
),
66 FW3_LIST("masq_src", address
, zone
, masq_src
),
67 FW3_LIST("masq_dest", address
, zone
, masq_dest
),
69 FW3_OPT("extra", string
, zone
, extra_src
),
70 FW3_OPT("extra_src", string
, zone
, extra_src
),
71 FW3_OPT("extra_dest", string
, zone
, extra_dest
),
73 FW3_OPT("conntrack", bool, zone
, conntrack
),
74 FW3_OPT("mtu_fix", bool, zone
, mtu_fix
),
75 FW3_OPT("custom_chains", bool, zone
, custom_chains
),
77 FW3_OPT("log", bool, zone
, log
),
78 FW3_OPT("log_limit", limit
, zone
, log_limit
),
83 print_chains(enum fw3_table table
, enum fw3_family family
,
84 const char *fmt
, const char *name
, uint8_t targets
,
85 const struct chain
*chains
, int n
)
89 const struct chain
*c
;
91 for (c
= chains
; n
> 0; c
++, n
--)
93 if (!fw3_is_family(c
, family
))
96 if (c
->table
!= table
)
99 if ((c
->target
!= FW3_TARGET_UNSPEC
) && !(targets
& (1 << c
->target
)))
102 snprintf(cn
, sizeof(cn
), c
->name
, name
);
112 check_policy(struct uci_element
*e
, enum fw3_target
*pol
, enum fw3_target def
,
115 if (*pol
== FW3_TARGET_UNSPEC
)
117 warn_elem(e
, "has no %s policy specified, using default", name
);
120 else if (*pol
> FW3_TARGET_DROP
)
122 warn_elem(e
, "has invalid %s policy, using default", name
);
128 resolve_networks(struct uci_element
*e
, struct fw3_zone
*zone
)
130 struct fw3_device
*net
, *tmp
;
132 list_for_each_entry(net
, &zone
->networks
, list
)
134 tmp
= fw3_ubus_device(net
->name
);
138 warn_elem(e
, "cannot resolve device of network '%s'", net
->name
);
142 list_add_tail(&tmp
->list
, &zone
->devices
);
147 fw3_load_zones(struct fw3_state
*state
, struct uci_package
*p
)
149 struct uci_section
*s
;
150 struct uci_element
*e
;
151 struct fw3_zone
*zone
;
152 struct fw3_defaults
*defs
= &state
->defaults
;
154 INIT_LIST_HEAD(&state
->zones
);
156 uci_foreach_element(&p
->sections
, e
)
158 s
= uci_to_section(e
);
160 if (strcmp(s
->type
, "zone"))
163 zone
= malloc(sizeof(*zone
));
168 memset(zone
, 0, sizeof(*zone
));
170 INIT_LIST_HEAD(&zone
->networks
);
171 INIT_LIST_HEAD(&zone
->devices
);
172 INIT_LIST_HEAD(&zone
->subnets
);
173 INIT_LIST_HEAD(&zone
->masq_src
);
174 INIT_LIST_HEAD(&zone
->masq_dest
);
176 zone
->log_limit
.rate
= 10;
178 fw3_parse_options(zone
, zone_opts
, ARRAY_SIZE(zone_opts
), s
);
180 if (!zone
->extra_dest
)
181 zone
->extra_dest
= zone
->extra_src
;
183 if (!zone
->name
|| !*zone
->name
)
185 warn_elem(e
, "has no name - ignoring");
190 if (list_empty(&zone
->networks
) && list_empty(&zone
->devices
) &&
191 list_empty(&zone
->subnets
) && !zone
->extra_src
)
193 warn_elem(e
, "has no device, network, subnet or extra options");
196 check_policy(e
, &zone
->policy_input
, defs
->policy_input
, "input");
197 check_policy(e
, &zone
->policy_output
, defs
->policy_output
, "output");
198 check_policy(e
, &zone
->policy_forward
, defs
->policy_forward
, "forward");
200 resolve_networks(e
, zone
);
204 setbit(zone
->has_dest_target
, FW3_TARGET_SNAT
);
205 zone
->conntrack
= true;
208 setbit(zone
->has_src_target
, zone
->policy_input
);
209 setbit(zone
->has_dest_target
, zone
->policy_output
);
210 setbit(zone
->has_dest_target
, zone
->policy_forward
);
212 list_add_tail(&zone
->list
, &state
->zones
);
218 print_zone_chain(enum fw3_table table
, enum fw3_family family
,
219 struct fw3_zone
*zone
, bool disable_notrack
)
223 if (!fw3_is_family(zone
, family
))
226 if (!zone
->conntrack
&& !disable_notrack
)
227 setbit(zone
->has_dest_target
, FW3_TARGET_NOTRACK
);
229 s
= print_chains(table
, family
, ":%s - [0:0]\n", zone
->name
,
230 zone
->has_src_target
, src_chains
, ARRAY_SIZE(src_chains
));
232 d
= print_chains(table
, family
, ":%s - [0:0]\n", zone
->name
,
233 zone
->has_dest_target
, dst_chains
, ARRAY_SIZE(dst_chains
));
236 info(" * Zone '%s'", zone
->name
);
240 print_interface_rule(enum fw3_table table
, enum fw3_family family
,
241 struct fw3_zone
*zone
, struct fw3_device
*dev
,
242 struct fw3_address
*sub
, bool disable_notrack
)
245 const char *targets
[] = {
252 if (table
== FW3_TABLE_FILTER
)
254 for (t
= FW3_TARGET_ACCEPT
; t
<= FW3_TARGET_DROP
; t
++)
256 if (zone
->has_src_target
& (1 << t
))
258 fw3_pr("-A zone_%s_src_%s", zone
->name
, targets
[t
*2]);
259 fw3_format_in_out(dev
, NULL
);
260 fw3_format_src_dest(sub
, NULL
);
261 fw3_format_extra(zone
->extra_src
);
262 fw3_pr(" -j %s\n", targets
[t
*2+1]);
265 if (zone
->has_dest_target
& (1 << t
))
267 fw3_pr("-A zone_%s_dest_%s", zone
->name
, targets
[t
*2]);
268 fw3_format_in_out(NULL
, dev
);
269 fw3_format_src_dest(NULL
, sub
);
270 fw3_format_extra(zone
->extra_dest
);
271 fw3_pr(" -j %s\n", targets
[t
*2+1]);
275 fw3_pr("-A delegate_input");
276 fw3_format_in_out(dev
, NULL
);
277 fw3_format_src_dest(sub
, NULL
);
278 fw3_format_extra(zone
->extra_src
);
279 fw3_pr(" -j zone_%s_input\n", zone
->name
);
281 fw3_pr("-A delegate_forward");
282 fw3_format_in_out(dev
, NULL
);
283 fw3_format_src_dest(sub
, NULL
);
284 fw3_format_extra(zone
->extra_src
);
285 fw3_pr(" -j zone_%s_forward\n", zone
->name
);
287 fw3_pr("-A delegate_output");
288 fw3_format_in_out(NULL
, dev
);
289 fw3_format_src_dest(NULL
, sub
);
290 fw3_format_extra(zone
->extra_dest
);
291 fw3_pr(" -j zone_%s_output\n", zone
->name
);
293 else if (table
== FW3_TABLE_NAT
)
295 if (zone
->has_dest_target
& (1 << FW3_TARGET_DNAT
))
297 fw3_pr("-A delegate_prerouting");
298 fw3_format_in_out(dev
, NULL
);
299 fw3_format_src_dest(sub
, NULL
);
300 fw3_format_extra(zone
->extra_src
);
301 fw3_pr(" -j zone_%s_prerouting\n", zone
->name
);
304 if (zone
->has_dest_target
& (1 << FW3_TARGET_SNAT
))
306 fw3_pr("-A delegate_postrouting");
307 fw3_format_in_out(NULL
, dev
);
308 fw3_format_src_dest(NULL
, sub
);
309 fw3_format_extra(zone
->extra_dest
);
310 fw3_pr(" -j zone_%s_postrouting\n", zone
->name
);
313 else if (table
== FW3_TABLE_MANGLE
)
320 fw3_format_in_out(NULL
, dev
);
321 fw3_format_src_dest(NULL
, sub
);
322 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
323 fw3_format_limit(&zone
->log_limit
);
324 fw3_format_comment(zone
->name
, " (mtu_fix logging)");
325 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone
->name
);
329 fw3_format_in_out(NULL
, dev
);
330 fw3_format_src_dest(NULL
, sub
);
331 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
332 fw3_format_comment(zone
->name
, " (mtu_fix)");
333 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
336 else if (table
== FW3_TABLE_RAW
)
338 if (!zone
->conntrack
&& !disable_notrack
)
340 fw3_pr("-A notrack");
341 fw3_format_in_out(dev
, NULL
);
342 fw3_format_src_dest(sub
, NULL
);
343 fw3_format_extra(zone
->extra_src
);
344 fw3_format_comment(zone
->name
, " (notrack)");
345 fw3_pr(" -j CT --notrack\n", zone
->name
);
351 print_interface_rules(enum fw3_table table
, enum fw3_family family
,
352 struct fw3_zone
*zone
, bool disable_notrack
)
354 struct fw3_device
*dev
;
355 struct fw3_address
*sub
;
357 fw3_foreach(dev
, &zone
->devices
)
358 fw3_foreach(sub
, &zone
->subnets
)
360 if (!fw3_is_family(sub
, family
))
366 print_interface_rule(table
, family
, zone
, dev
, sub
, disable_notrack
);
371 print_zone_rule(enum fw3_table table
, enum fw3_family family
,
372 struct fw3_zone
*zone
, bool disable_notrack
)
374 struct fw3_address
*msrc
;
375 struct fw3_address
*mdest
;
378 const char *targets
[] = {
388 if (!fw3_is_family(zone
, family
))
393 case FW3_TABLE_FILTER
:
394 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
395 zone
->name
, zone
->name
, targets
[zone
->policy_input
]);
397 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
398 zone
->name
, zone
->name
, targets
[zone
->policy_forward
]);
400 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
401 zone
->name
, zone
->name
, targets
[zone
->policy_output
]);
405 for (t
= FW3_TARGET_REJECT
; t
<= FW3_TARGET_DROP
; t
++)
407 if (zone
->has_src_target
& (1 << t
))
409 fw3_pr("-A zone_%s_src_%s", zone
->name
, targets
[t
]);
410 fw3_format_limit(&zone
->log_limit
);
411 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
412 targets
[t
], zone
->name
);
415 if (zone
->has_dest_target
& (1 << t
))
417 fw3_pr("-A zone_%s_dest_%s", zone
->name
, targets
[t
]);
418 fw3_format_limit(&zone
->log_limit
);
419 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
420 targets
[t
], zone
->name
);
427 if (zone
->masq
&& family
== FW3_FAMILY_V4
)
429 fw3_foreach(msrc
, &zone
->masq_src
)
430 fw3_foreach(mdest
, &zone
->masq_dest
)
432 fw3_pr("-A zone_%s_postrouting ", zone
->name
);
433 fw3_format_src_dest(msrc
, mdest
);
434 fw3_pr("-j MASQUERADE\n");
440 case FW3_TABLE_MANGLE
:
444 print_interface_rules(table
, family
, zone
, disable_notrack
);
448 fw3_print_zone_chains(enum fw3_table table
, enum fw3_family family
,
449 struct fw3_state
*state
)
451 struct fw3_zone
*zone
;
453 list_for_each_entry(zone
, &state
->zones
, list
)
454 print_zone_chain(table
, family
, zone
, state
->defaults
.drop_invalid
);
458 fw3_print_zone_rules(enum fw3_table table
, enum fw3_family family
,
459 struct fw3_state
*state
)
461 struct fw3_zone
*zone
;
463 list_for_each_entry(zone
, &state
->zones
, list
)
464 print_zone_rule(table
, family
, zone
, state
->defaults
.drop_invalid
);
468 fw3_flush_zones(enum fw3_table table
, enum fw3_family family
,
469 bool pass2
, struct list_head
*statefile
)
471 struct fw3_statefile_entry
*e
;
473 list_for_each_entry(e
, statefile
, list
)
475 if (e
->type
!= FW3_TYPE_ZONE
)
478 print_chains(table
, family
, pass2
? "-X %s\n" : "-F %s\n",
479 e
->name
, e
->flags
[0], src_chains
, ARRAY_SIZE(src_chains
));
481 print_chains(table
, family
, pass2
? "-X %s\n" : "-F %s\n",
482 e
->name
, e
->flags
[1], dst_chains
, ARRAY_SIZE(dst_chains
));
487 fw3_lookup_zone(struct fw3_state
*state
, const char *name
)
491 if (list_empty(&state
->zones
))
494 list_for_each_entry(z
, &state
->zones
, list
)
495 if (!strcmp(z
->name
, name
))
502 fw3_free_zone(struct fw3_zone
*zone
)
504 fw3_free_list(&zone
->networks
);
505 fw3_free_list(&zone
->devices
);
506 fw3_free_list(&zone
->subnets
);
508 fw3_free_list(&zone
->masq_src
);
509 fw3_free_list(&zone
->masq_dest
);