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 zone_chains
[] = {
34 C(ANY
, FILTER
, UNSPEC
, "zone_%1$s_input"),
35 C(ANY
, FILTER
, UNSPEC
, "zone_%1$s_output"),
36 C(ANY
, FILTER
, UNSPEC
, "zone_%1$s_forward"),
38 C(ANY
, FILTER
, SRC_ACCEPT
, "zone_%1$s_src_ACCEPT"),
39 C(ANY
, FILTER
, SRC_REJECT
, "zone_%1$s_src_REJECT"),
40 C(ANY
, FILTER
, SRC_DROP
, "zone_%1$s_src_DROP"),
42 C(ANY
, FILTER
, ACCEPT
, "zone_%1$s_dest_ACCEPT"),
43 C(ANY
, FILTER
, REJECT
, "zone_%1$s_dest_REJECT"),
44 C(ANY
, FILTER
, DROP
, "zone_%1$s_dest_DROP"),
46 C(V4
, NAT
, SNAT
, "zone_%1$s_postrouting"),
47 C(V4
, NAT
, DNAT
, "zone_%1$s_prerouting"),
49 C(ANY
, FILTER
, CUSTOM_CHAINS
, "input_%1$s_rule"),
50 C(ANY
, FILTER
, CUSTOM_CHAINS
, "output_%1$s_rule"),
51 C(ANY
, FILTER
, CUSTOM_CHAINS
, "forwarding_%1$s_rule"),
53 C(V4
, NAT
, CUSTOM_CHAINS
, "prerouting_%1$s_rule"),
54 C(V4
, NAT
, CUSTOM_CHAINS
, "postrouting_%1$s_rule"),
58 #define R(dir1, dir2) \
59 "zone_%1$s_" #dir1 " -m comment --comment \"user chain for %1$s " \
60 #dir2 "\" -j " #dir2 "_%1$s_rule"
62 static const struct chain zone_rules
[] = {
63 C(ANY
, FILTER
, CUSTOM_CHAINS
, R(input
, input
)),
64 C(ANY
, FILTER
, CUSTOM_CHAINS
, R(output
, output
)),
65 C(ANY
, FILTER
, CUSTOM_CHAINS
, R(forward
, forwarding
)),
67 C(V4
, NAT
, CUSTOM_CHAINS
, R(prerouting
, prerouting
)),
68 C(V4
, NAT
, CUSTOM_CHAINS
, R(postrouting
, postrouting
)),
71 const struct fw3_option fw3_zone_opts
[] = {
72 FW3_OPT("enabled", bool, zone
, enabled
),
74 FW3_OPT("name", string
, zone
, name
),
75 FW3_OPT("family", family
, zone
, family
),
77 FW3_LIST("network", device
, zone
, networks
),
78 FW3_LIST("device", device
, zone
, devices
),
79 FW3_LIST("subnet", address
, zone
, subnets
),
81 FW3_OPT("input", target
, zone
, policy_input
),
82 FW3_OPT("forward", target
, zone
, policy_forward
),
83 FW3_OPT("output", target
, zone
, policy_output
),
85 FW3_OPT("masq", bool, zone
, masq
),
86 FW3_LIST("masq_src", address
, zone
, masq_src
),
87 FW3_LIST("masq_dest", address
, zone
, masq_dest
),
89 FW3_OPT("extra", string
, zone
, extra_src
),
90 FW3_OPT("extra_src", string
, zone
, extra_src
),
91 FW3_OPT("extra_dest", string
, zone
, extra_dest
),
93 FW3_OPT("conntrack", bool, zone
, conntrack
),
94 FW3_OPT("mtu_fix", bool, zone
, mtu_fix
),
95 FW3_OPT("custom_chains", bool, zone
, custom_chains
),
97 FW3_OPT("log", bool, zone
, log
),
98 FW3_OPT("log_limit", limit
, zone
, log_limit
),
105 print_chains(enum fw3_table table
, enum fw3_family family
,
106 const char *fmt
, const char *name
, uint32_t *targets
, uint32_t mask
,
107 const struct chain
*chains
, int n
)
110 char cn
[256] = { 0 };
111 const struct chain
*c
;
112 uint32_t t
= targets
? targets
[family
== FW3_FAMILY_V6
] : 0;
117 for (c
= chains
; n
> 0; c
++, n
--)
119 if (!fw3_is_family(c
, family
))
122 if (c
->table
!= table
)
125 if ((c
->target
!= FW3_TARGET_UNSPEC
) && !hasbit(t
, c
->target
))
128 snprintf(cn
, sizeof(cn
), c
->name
, name
);
138 check_policy(struct uci_element
*e
, enum fw3_target
*pol
, enum fw3_target def
,
141 if (*pol
== FW3_TARGET_UNSPEC
)
143 warn_elem(e
, "has no %s policy specified, using default", name
);
146 else if (*pol
> FW3_TARGET_DROP
)
148 warn_elem(e
, "has invalid %s policy, using default", name
);
154 resolve_networks(struct uci_element
*e
, struct fw3_zone
*zone
)
156 struct fw3_device
*net
, *tmp
;
158 list_for_each_entry(net
, &zone
->networks
, list
)
160 tmp
= fw3_ubus_device(net
->name
);
164 warn_elem(e
, "cannot resolve device of network '%s'", net
->name
);
168 list_add_tail(&tmp
->list
, &zone
->devices
);
175 struct fw3_zone
*zone
;
177 zone
= malloc(sizeof(*zone
));
182 memset(zone
, 0, sizeof(*zone
));
184 INIT_LIST_HEAD(&zone
->networks
);
185 INIT_LIST_HEAD(&zone
->devices
);
186 INIT_LIST_HEAD(&zone
->subnets
);
187 INIT_LIST_HEAD(&zone
->masq_src
);
188 INIT_LIST_HEAD(&zone
->masq_dest
);
190 zone
->enabled
= true;
191 zone
->custom_chains
= true;
192 zone
->log_limit
.rate
= 10;
198 fw3_load_zones(struct fw3_state
*state
, struct uci_package
*p
)
200 struct uci_section
*s
;
201 struct uci_element
*e
;
202 struct fw3_zone
*zone
;
203 struct fw3_defaults
*defs
= &state
->defaults
;
205 INIT_LIST_HEAD(&state
->zones
);
207 uci_foreach_element(&p
->sections
, e
)
209 s
= uci_to_section(e
);
211 if (strcmp(s
->type
, "zone"))
214 zone
= fw3_alloc_zone();
219 fw3_parse_options(zone
, fw3_zone_opts
, s
);
227 if (!zone
->extra_dest
)
228 zone
->extra_dest
= zone
->extra_src
;
230 if (!defs
->custom_chains
&& zone
->custom_chains
)
231 zone
->custom_chains
= false;
233 if (!zone
->name
|| !*zone
->name
)
235 warn_elem(e
, "has no name - ignoring");
240 if (list_empty(&zone
->networks
) && list_empty(&zone
->devices
) &&
241 list_empty(&zone
->subnets
) && !zone
->extra_src
)
243 warn_elem(e
, "has no device, network, subnet or extra options");
246 check_policy(e
, &zone
->policy_input
, defs
->policy_input
, "input");
247 check_policy(e
, &zone
->policy_output
, defs
->policy_output
, "output");
248 check_policy(e
, &zone
->policy_forward
, defs
->policy_forward
, "forward");
250 resolve_networks(e
, zone
);
254 setbit(zone
->flags
[0], FW3_TARGET_SNAT
);
255 zone
->conntrack
= true;
258 if (zone
->custom_chains
)
260 setbit(zone
->flags
[0], FW3_TARGET_SNAT
);
261 setbit(zone
->flags
[0], FW3_TARGET_DNAT
);
264 setbit(zone
->flags
[0], fw3_to_src_target(zone
->policy_input
));
265 setbit(zone
->flags
[0], zone
->policy_output
);
266 setbit(zone
->flags
[0], zone
->policy_forward
);
268 setbit(zone
->flags
[1], fw3_to_src_target(zone
->policy_input
));
269 setbit(zone
->flags
[1], zone
->policy_output
);
270 setbit(zone
->flags
[1], zone
->policy_forward
);
272 list_add_tail(&zone
->list
, &state
->zones
);
278 print_zone_chain(enum fw3_table table
, enum fw3_family family
,
279 struct fw3_zone
*zone
, bool reload
, struct fw3_state
*state
)
282 uint32_t custom_mask
= ~0;
284 if (!fw3_is_family(zone
, family
))
287 set(zone
->flags
, family
, table
);
289 /* Don't touch user chains on reload */
291 delbit(custom_mask
, FW3_TARGET_CUSTOM_CHAINS
);
293 if (zone
->custom_chains
)
294 set(zone
->flags
, family
, FW3_TARGET_CUSTOM_CHAINS
);
296 if (!zone
->conntrack
&& !state
->defaults
.drop_invalid
)
297 set(zone
->flags
, family
, FW3_TARGET_NOTRACK
);
299 c
= print_chains(table
, family
, ":%s - [0:0]\n", zone
->name
,
300 zone
->flags
, custom_mask
,
301 zone_chains
, ARRAY_SIZE(zone_chains
));
303 r
= print_chains(table
, family
, "-A %s\n", zone
->name
,
305 zone_rules
, ARRAY_SIZE(zone_rules
));
309 info(" * Zone '%s'", zone
->name
);
310 fw3_set_running(zone
, &state
->running_zones
);
312 set(zone
->flags
, family
, table
);
317 print_interface_rule(enum fw3_table table
, enum fw3_family family
,
318 struct fw3_zone
*zone
, struct fw3_device
*dev
,
319 struct fw3_address
*sub
, bool reload
, bool disable_notrack
)
323 #define jump_target(t) \
324 ((t == FW3_TARGET_REJECT) ? "reject" : fw3_flag_names[t])
326 if (table
== FW3_TABLE_FILTER
)
328 for (t
= FW3_TARGET_ACCEPT
; t
<= FW3_TARGET_DROP
; t
++)
330 if (has(zone
->flags
, family
, fw3_to_src_target(t
)))
332 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
333 fw3_format_in_out(dev
, NULL
);
334 fw3_format_src_dest(sub
, NULL
);
335 fw3_format_extra(zone
->extra_src
);
336 fw3_pr(" -j %s\n", jump_target(t
));
339 if (has(zone
->flags
, family
, t
))
341 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
342 fw3_format_in_out(NULL
, dev
);
343 fw3_format_src_dest(NULL
, sub
);
344 fw3_format_extra(zone
->extra_dest
);
345 fw3_pr(" -j %s\n", jump_target(t
));
349 fw3_pr("-A delegate_input");
350 fw3_format_in_out(dev
, NULL
);
351 fw3_format_src_dest(sub
, NULL
);
352 fw3_format_extra(zone
->extra_src
);
353 fw3_pr(" -j zone_%s_input\n", zone
->name
);
355 fw3_pr("-A delegate_forward");
356 fw3_format_in_out(dev
, NULL
);
357 fw3_format_src_dest(sub
, NULL
);
358 fw3_format_extra(zone
->extra_src
);
359 fw3_pr(" -j zone_%s_forward\n", zone
->name
);
361 fw3_pr("-A delegate_output");
362 fw3_format_in_out(NULL
, dev
);
363 fw3_format_src_dest(NULL
, sub
);
364 fw3_format_extra(zone
->extra_dest
);
365 fw3_pr(" -j zone_%s_output\n", zone
->name
);
367 else if (table
== FW3_TABLE_NAT
)
369 if (has(zone
->flags
, family
, FW3_TARGET_DNAT
))
371 fw3_pr("-A delegate_prerouting");
372 fw3_format_in_out(dev
, NULL
);
373 fw3_format_src_dest(sub
, NULL
);
374 fw3_format_extra(zone
->extra_src
);
375 fw3_pr(" -j zone_%s_prerouting\n", zone
->name
);
378 if (has(zone
->flags
, family
, FW3_TARGET_SNAT
))
380 fw3_pr("-A delegate_postrouting");
381 fw3_format_in_out(NULL
, dev
);
382 fw3_format_src_dest(NULL
, sub
);
383 fw3_format_extra(zone
->extra_dest
);
384 fw3_pr(" -j zone_%s_postrouting\n", zone
->name
);
387 else if (table
== FW3_TABLE_MANGLE
)
394 fw3_format_in_out(NULL
, dev
);
395 fw3_format_src_dest(NULL
, sub
);
396 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
397 fw3_format_limit(&zone
->log_limit
);
398 fw3_format_comment(zone
->name
, " (mtu_fix logging)");
399 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone
->name
);
403 fw3_format_in_out(NULL
, dev
);
404 fw3_format_src_dest(NULL
, sub
);
405 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
406 fw3_format_comment(zone
->name
, " (mtu_fix)");
407 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
410 else if (table
== FW3_TABLE_RAW
)
412 if (!zone
->conntrack
&& !disable_notrack
)
414 fw3_pr("-A notrack");
415 fw3_format_in_out(dev
, NULL
);
416 fw3_format_src_dest(sub
, NULL
);
417 fw3_format_extra(zone
->extra_src
);
418 fw3_format_comment(zone
->name
, " (notrack)");
419 fw3_pr(" -j CT --notrack\n", zone
->name
);
425 print_interface_rules(enum fw3_table table
, enum fw3_family family
,
426 struct fw3_zone
*zone
, bool reload
, bool disable_notrack
)
428 struct fw3_device
*dev
;
429 struct fw3_address
*sub
;
431 fw3_foreach(dev
, &zone
->devices
)
432 fw3_foreach(sub
, &zone
->subnets
)
434 if (!fw3_is_family(sub
, family
))
440 print_interface_rule(table
, family
, zone
, dev
, sub
, reload
, disable_notrack
);
445 print_zone_rule(enum fw3_table table
, enum fw3_family family
,
446 struct fw3_zone
*zone
, bool reload
, bool disable_notrack
)
448 struct fw3_address
*msrc
;
449 struct fw3_address
*mdest
;
453 if (!fw3_is_family(zone
, family
))
458 case FW3_TABLE_FILTER
:
459 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
460 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_input
]);
462 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
463 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_forward
]);
465 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
466 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_output
]);
470 for (t
= FW3_TARGET_REJECT
; t
<= FW3_TARGET_DROP
; t
++)
472 if (has(zone
->flags
, family
, fw3_to_src_target(t
)))
474 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
475 fw3_format_limit(&zone
->log_limit
);
476 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
477 fw3_flag_names
[t
], zone
->name
);
480 if (has(zone
->flags
, family
, t
))
482 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
483 fw3_format_limit(&zone
->log_limit
);
484 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
485 fw3_flag_names
[t
], zone
->name
);
492 if (zone
->masq
&& family
== FW3_FAMILY_V4
)
494 fw3_foreach(msrc
, &zone
->masq_src
)
495 fw3_foreach(mdest
, &zone
->masq_dest
)
497 fw3_pr("-A zone_%s_postrouting ", zone
->name
);
498 fw3_format_src_dest(msrc
, mdest
);
499 fw3_pr("-j MASQUERADE\n");
505 case FW3_TABLE_MANGLE
:
509 print_interface_rules(table
, family
, zone
, reload
, disable_notrack
);
513 fw3_print_zone_chains(enum fw3_table table
, enum fw3_family family
,
514 bool reload
, struct fw3_state
*state
)
516 struct fw3_zone
*zone
;
518 list_for_each_entry(zone
, &state
->zones
, list
)
519 print_zone_chain(table
, family
, zone
, reload
, state
);
523 fw3_print_zone_rules(enum fw3_table table
, enum fw3_family family
,
524 bool reload
, struct fw3_state
*state
)
526 struct fw3_zone
*zone
;
528 list_for_each_entry(zone
, &state
->zones
, list
)
529 print_zone_rule(table
, family
, zone
, reload
, state
->defaults
.drop_invalid
);
533 fw3_flush_zones(enum fw3_table table
, enum fw3_family family
,
534 bool pass2
, bool reload
, struct fw3_state
*state
)
536 struct fw3_zone
*z
, *tmp
;
537 uint32_t custom_mask
= ~0;
539 /* don't touch user chains on selective stop */
541 delbit(custom_mask
, FW3_TARGET_CUSTOM_CHAINS
);
543 list_for_each_entry_safe(z
, tmp
, &state
->running_zones
, running_list
)
545 if (!has(z
->flags
, family
, table
))
548 print_chains(table
, family
, pass2
? "-X %s\n" : "-F %s\n",
549 z
->name
, z
->flags
, custom_mask
,
550 zone_chains
, ARRAY_SIZE(zone_chains
));
554 del(z
->flags
, family
, table
);
560 fw3_lookup_zone(struct fw3_state
*state
, const char *name
, bool running
)
564 if (list_empty(&state
->zones
))
567 list_for_each_entry(z
, &state
->zones
, list
)
569 if (strcmp(z
->name
, name
))
572 if (!running
|| z
->running_list
.next
)