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_%1$s_input"),
35 C(ANY
, FILTER
, UNSPEC
, "zone_%1$s_output"),
36 C(ANY
, FILTER
, UNSPEC
, "zone_%1$s_forward"),
38 C(ANY
, FILTER
, ACCEPT
, "zone_%1$s_src_ACCEPT"),
39 C(ANY
, FILTER
, REJECT
, "zone_%1$s_src_REJECT"),
40 C(ANY
, FILTER
, DROP
, "zone_%1$s_src_DROP"),
43 static const struct chain dst_chains
[] = {
44 C(ANY
, FILTER
, ACCEPT
, "zone_%1$s_dest_ACCEPT"),
45 C(ANY
, FILTER
, REJECT
, "zone_%1$s_dest_REJECT"),
46 C(ANY
, FILTER
, DROP
, "zone_%1$s_dest_DROP"),
48 C(V4
, NAT
, SNAT
, "zone_%1$s_postrouting"),
49 C(V4
, NAT
, DNAT
, "zone_%1$s_prerouting"),
51 C(ANY
, FILTER
, CUSTOM_CNS_V4
, "input_%1$s_rule"),
52 C(ANY
, FILTER
, CUSTOM_CNS_V4
, "output_%1$s_rule"),
53 C(ANY
, FILTER
, CUSTOM_CNS_V4
, "forwarding_%1$s_rule"),
54 C(ANY
, FILTER
, CUSTOM_CNS_V6
, "input_%1$s_rule"),
55 C(ANY
, FILTER
, CUSTOM_CNS_V6
, "output_%1$s_rule"),
56 C(ANY
, FILTER
, CUSTOM_CNS_V6
, "forwarding_%1$s_rule"),
58 C(V4
, NAT
, CUSTOM_CNS_V4
, "prerouting_%1$s_rule"),
59 C(V4
, NAT
, CUSTOM_CNS_V4
, "postrouting_%1$s_rule"),
63 #define R(dir1, dir2) \
64 "zone_%1$s_" #dir1 " -m comment --comment \"user chain for %1$s " \
65 #dir2 "\" -j " #dir2 "_%1$s_rule"
67 static const struct chain def_rules
[] = {
68 C(ANY
, FILTER
, CUSTOM_CNS_V4
, R(input
, input
)),
69 C(ANY
, FILTER
, CUSTOM_CNS_V4
, R(output
, output
)),
70 C(ANY
, FILTER
, CUSTOM_CNS_V4
, R(forward
, forwarding
)),
71 C(ANY
, FILTER
, CUSTOM_CNS_V6
, R(input
, input
)),
72 C(ANY
, FILTER
, CUSTOM_CNS_V6
, R(output
, output
)),
73 C(ANY
, FILTER
, CUSTOM_CNS_V6
, R(forward
, forwarding
)),
75 C(V4
, NAT
, CUSTOM_CNS_V4
, R(prerouting
, prerouting
)),
76 C(V4
, NAT
, CUSTOM_CNS_V4
, R(postrouting
, postrouting
)),
79 const struct fw3_option fw3_zone_opts
[] = {
80 FW3_OPT("enabled", bool, zone
, enabled
),
82 FW3_OPT("name", string
, zone
, name
),
83 FW3_OPT("family", family
, zone
, family
),
85 FW3_LIST("network", device
, zone
, networks
),
86 FW3_LIST("device", device
, zone
, devices
),
87 FW3_LIST("subnet", address
, zone
, subnets
),
89 FW3_OPT("input", target
, zone
, policy_input
),
90 FW3_OPT("forward", target
, zone
, policy_forward
),
91 FW3_OPT("output", target
, zone
, policy_output
),
93 FW3_OPT("masq", bool, zone
, masq
),
94 FW3_LIST("masq_src", address
, zone
, masq_src
),
95 FW3_LIST("masq_dest", address
, zone
, masq_dest
),
97 FW3_OPT("extra", string
, zone
, extra_src
),
98 FW3_OPT("extra_src", string
, zone
, extra_src
),
99 FW3_OPT("extra_dest", string
, zone
, extra_dest
),
101 FW3_OPT("conntrack", bool, zone
, conntrack
),
102 FW3_OPT("mtu_fix", bool, zone
, mtu_fix
),
103 FW3_OPT("custom_chains", bool, zone
, custom_chains
),
105 FW3_OPT("log", bool, zone
, log
),
106 FW3_OPT("log_limit", limit
, zone
, log_limit
),
113 print_chains(enum fw3_table table
, enum fw3_family family
,
114 const char *fmt
, const char *name
, uint32_t targets
,
115 const struct chain
*chains
, int n
)
118 char cn
[256] = { 0 };
119 const struct chain
*c
;
121 for (c
= chains
; n
> 0; c
++, n
--)
123 if (!fw3_is_family(c
, family
))
126 if (c
->table
!= table
)
129 if ((c
->target
!= FW3_TARGET_UNSPEC
) && !hasbit(targets
, c
->target
))
132 snprintf(cn
, sizeof(cn
), c
->name
, name
);
142 check_policy(struct uci_element
*e
, enum fw3_target
*pol
, enum fw3_target def
,
145 if (*pol
== FW3_TARGET_UNSPEC
)
147 warn_elem(e
, "has no %s policy specified, using default", name
);
150 else if (*pol
> FW3_TARGET_DROP
)
152 warn_elem(e
, "has invalid %s policy, using default", name
);
158 resolve_networks(struct uci_element
*e
, struct fw3_zone
*zone
)
160 struct fw3_device
*net
, *tmp
;
162 list_for_each_entry(net
, &zone
->networks
, list
)
164 tmp
= fw3_ubus_device(net
->name
);
168 warn_elem(e
, "cannot resolve device of network '%s'", net
->name
);
172 list_add_tail(&tmp
->list
, &zone
->devices
);
179 struct fw3_zone
*zone
;
181 zone
= malloc(sizeof(*zone
));
186 memset(zone
, 0, sizeof(*zone
));
188 INIT_LIST_HEAD(&zone
->networks
);
189 INIT_LIST_HEAD(&zone
->devices
);
190 INIT_LIST_HEAD(&zone
->subnets
);
191 INIT_LIST_HEAD(&zone
->masq_src
);
192 INIT_LIST_HEAD(&zone
->masq_dest
);
194 zone
->enabled
= true;
195 zone
->custom_chains
= true;
196 zone
->log_limit
.rate
= 10;
202 fw3_load_zones(struct fw3_state
*state
, struct uci_package
*p
)
204 struct uci_section
*s
;
205 struct uci_element
*e
;
206 struct fw3_zone
*zone
;
207 struct fw3_defaults
*defs
= &state
->defaults
;
209 INIT_LIST_HEAD(&state
->zones
);
211 uci_foreach_element(&p
->sections
, e
)
213 s
= uci_to_section(e
);
215 if (strcmp(s
->type
, "zone"))
218 zone
= fw3_alloc_zone();
223 fw3_parse_options(zone
, fw3_zone_opts
, s
);
231 if (!zone
->extra_dest
)
232 zone
->extra_dest
= zone
->extra_src
;
234 if (!defs
->custom_chains
&& zone
->custom_chains
)
235 zone
->custom_chains
= false;
237 if (!zone
->name
|| !*zone
->name
)
239 warn_elem(e
, "has no name - ignoring");
244 if (list_empty(&zone
->networks
) && list_empty(&zone
->devices
) &&
245 list_empty(&zone
->subnets
) && !zone
->extra_src
)
247 warn_elem(e
, "has no device, network, subnet or extra options");
250 check_policy(e
, &zone
->policy_input
, defs
->policy_input
, "input");
251 check_policy(e
, &zone
->policy_output
, defs
->policy_output
, "output");
252 check_policy(e
, &zone
->policy_forward
, defs
->policy_forward
, "forward");
254 resolve_networks(e
, zone
);
258 setbit(zone
->dst_flags
, FW3_TARGET_SNAT
);
259 zone
->conntrack
= true;
262 if (zone
->custom_chains
)
264 setbit(zone
->dst_flags
, FW3_TARGET_SNAT
);
265 setbit(zone
->dst_flags
, FW3_TARGET_DNAT
);
268 setbit(zone
->src_flags
, zone
->policy_input
);
269 setbit(zone
->dst_flags
, zone
->policy_output
);
270 setbit(zone
->dst_flags
, 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
, struct fw3_state
*state
)
283 uint32_t custom_mask
= ~0;
285 if (!fw3_is_family(zone
, family
))
288 setbit(zone
->dst_flags
, family
);
290 /* user chains already loaded, don't create again */
291 for (f
= FW3_TARGET_CUSTOM_CNS_V4
; f
<= FW3_TARGET_CUSTOM_CNS_V6
; f
++)
292 if (hasbit(zone
->running_dst_flags
, f
))
293 delbit(custom_mask
, f
);
295 if (zone
->custom_chains
)
296 setbit(zone
->dst_flags
, (family
== FW3_FAMILY_V4
) ?
297 FW3_TARGET_CUSTOM_CNS_V4
: FW3_TARGET_CUSTOM_CNS_V6
);
299 if (!zone
->conntrack
&& !state
->defaults
.drop_invalid
)
300 setbit(zone
->dst_flags
, FW3_TARGET_NOTRACK
);
302 s
= print_chains(table
, family
, ":%s - [0:0]\n", zone
->name
,
304 src_chains
, ARRAY_SIZE(src_chains
));
306 d
= print_chains(table
, family
, ":%s - [0:0]\n", zone
->name
,
307 zone
->dst_flags
& custom_mask
,
308 dst_chains
, ARRAY_SIZE(dst_chains
));
310 r
= print_chains(table
, family
, "-A %s\n", zone
->name
,
312 def_rules
, ARRAY_SIZE(def_rules
));
316 info(" * Zone '%s'", zone
->name
);
317 fw3_set_running(zone
, &state
->running_zones
);
322 print_interface_rule(enum fw3_table table
, enum fw3_family family
,
323 struct fw3_zone
*zone
, struct fw3_device
*dev
,
324 struct fw3_address
*sub
, bool disable_notrack
)
328 #define jump_target(t) \
329 ((t == FW3_TARGET_REJECT) ? "reject" : fw3_flag_names[t])
331 if (table
== FW3_TABLE_FILTER
)
333 for (t
= FW3_TARGET_ACCEPT
; t
<= FW3_TARGET_DROP
; t
++)
335 if (hasbit(zone
->src_flags
, t
))
337 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
338 fw3_format_in_out(dev
, NULL
);
339 fw3_format_src_dest(sub
, NULL
);
340 fw3_format_extra(zone
->extra_src
);
341 fw3_pr(" -j %s\n", jump_target(t
));
344 if (hasbit(zone
->dst_flags
, t
))
346 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
347 fw3_format_in_out(NULL
, dev
);
348 fw3_format_src_dest(NULL
, sub
);
349 fw3_format_extra(zone
->extra_dest
);
350 fw3_pr(" -j %s\n", jump_target(t
));
354 fw3_pr("-A delegate_input");
355 fw3_format_in_out(dev
, NULL
);
356 fw3_format_src_dest(sub
, NULL
);
357 fw3_format_extra(zone
->extra_src
);
358 fw3_pr(" -j zone_%s_input\n", zone
->name
);
360 fw3_pr("-A delegate_forward");
361 fw3_format_in_out(dev
, NULL
);
362 fw3_format_src_dest(sub
, NULL
);
363 fw3_format_extra(zone
->extra_src
);
364 fw3_pr(" -j zone_%s_forward\n", zone
->name
);
366 fw3_pr("-A delegate_output");
367 fw3_format_in_out(NULL
, dev
);
368 fw3_format_src_dest(NULL
, sub
);
369 fw3_format_extra(zone
->extra_dest
);
370 fw3_pr(" -j zone_%s_output\n", zone
->name
);
372 else if (table
== FW3_TABLE_NAT
)
374 if (hasbit(zone
->dst_flags
, FW3_TARGET_DNAT
))
376 fw3_pr("-A delegate_prerouting");
377 fw3_format_in_out(dev
, NULL
);
378 fw3_format_src_dest(sub
, NULL
);
379 fw3_format_extra(zone
->extra_src
);
380 fw3_pr(" -j zone_%s_prerouting\n", zone
->name
);
383 if (hasbit(zone
->dst_flags
, FW3_TARGET_SNAT
))
385 fw3_pr("-A delegate_postrouting");
386 fw3_format_in_out(NULL
, dev
);
387 fw3_format_src_dest(NULL
, sub
);
388 fw3_format_extra(zone
->extra_dest
);
389 fw3_pr(" -j zone_%s_postrouting\n", zone
->name
);
392 else if (table
== FW3_TABLE_MANGLE
)
399 fw3_format_in_out(NULL
, dev
);
400 fw3_format_src_dest(NULL
, sub
);
401 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
402 fw3_format_limit(&zone
->log_limit
);
403 fw3_format_comment(zone
->name
, " (mtu_fix logging)");
404 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone
->name
);
408 fw3_format_in_out(NULL
, dev
);
409 fw3_format_src_dest(NULL
, sub
);
410 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
411 fw3_format_comment(zone
->name
, " (mtu_fix)");
412 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
415 else if (table
== FW3_TABLE_RAW
)
417 if (!zone
->conntrack
&& !disable_notrack
)
419 fw3_pr("-A notrack");
420 fw3_format_in_out(dev
, NULL
);
421 fw3_format_src_dest(sub
, NULL
);
422 fw3_format_extra(zone
->extra_src
);
423 fw3_format_comment(zone
->name
, " (notrack)");
424 fw3_pr(" -j CT --notrack\n", zone
->name
);
430 print_interface_rules(enum fw3_table table
, enum fw3_family family
,
431 struct fw3_zone
*zone
, bool disable_notrack
)
433 struct fw3_device
*dev
;
434 struct fw3_address
*sub
;
436 fw3_foreach(dev
, &zone
->devices
)
437 fw3_foreach(sub
, &zone
->subnets
)
439 if (!fw3_is_family(sub
, family
))
445 print_interface_rule(table
, family
, zone
, dev
, sub
, disable_notrack
);
450 print_zone_rule(enum fw3_table table
, enum fw3_family family
,
451 struct fw3_zone
*zone
, bool disable_notrack
)
453 struct fw3_address
*msrc
;
454 struct fw3_address
*mdest
;
458 if (!fw3_is_family(zone
, family
))
463 case FW3_TABLE_FILTER
:
464 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
465 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_input
]);
467 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
468 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_forward
]);
470 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
471 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_output
]);
475 for (t
= FW3_TARGET_REJECT
; t
<= FW3_TARGET_DROP
; t
++)
477 if (hasbit(zone
->src_flags
, t
))
479 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
480 fw3_format_limit(&zone
->log_limit
);
481 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
482 fw3_flag_names
[t
], zone
->name
);
485 if (hasbit(zone
->dst_flags
, t
))
487 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
488 fw3_format_limit(&zone
->log_limit
);
489 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
490 fw3_flag_names
[t
], zone
->name
);
497 if (zone
->masq
&& family
== FW3_FAMILY_V4
)
499 fw3_foreach(msrc
, &zone
->masq_src
)
500 fw3_foreach(mdest
, &zone
->masq_dest
)
502 fw3_pr("-A zone_%s_postrouting ", zone
->name
);
503 fw3_format_src_dest(msrc
, mdest
);
504 fw3_pr("-j MASQUERADE\n");
510 case FW3_TABLE_MANGLE
:
514 print_interface_rules(table
, family
, zone
, disable_notrack
);
518 fw3_print_zone_chains(enum fw3_table table
, enum fw3_family family
,
519 struct fw3_state
*state
)
521 struct fw3_zone
*zone
;
523 list_for_each_entry(zone
, &state
->zones
, list
)
524 print_zone_chain(table
, family
, zone
, state
);
528 fw3_print_zone_rules(enum fw3_table table
, enum fw3_family family
,
529 struct fw3_state
*state
)
531 struct fw3_zone
*zone
;
533 list_for_each_entry(zone
, &state
->zones
, list
)
534 print_zone_rule(table
, family
, zone
, state
->defaults
.drop_invalid
);
538 fw3_flush_zones(enum fw3_table table
, enum fw3_family family
,
539 bool pass2
, bool reload
, struct fw3_state
*state
)
541 struct fw3_zone
*z
, *tmp
;
542 uint32_t custom_mask
= ~0;
543 uint32_t family_mask
= (1 << FW3_FAMILY_V4
) | (1 << FW3_FAMILY_V6
);
545 /* don't touch user chains on selective stop */
548 delbit(custom_mask
, FW3_TARGET_CUSTOM_CNS_V4
);
549 delbit(custom_mask
, FW3_TARGET_CUSTOM_CNS_V6
);
552 list_for_each_entry_safe(z
, tmp
, &state
->running_zones
, running_list
)
554 if (!hasbit(z
->dst_flags
, family
))
557 print_chains(table
, family
, pass2
? "-X %s\n" : "-F %s\n",
558 z
->name
, z
->running_src_flags
,
559 src_chains
, ARRAY_SIZE(src_chains
));
561 print_chains(table
, family
, pass2
? "-X %s\n" : "-F %s\n",
562 z
->name
, z
->running_dst_flags
& custom_mask
,
563 dst_chains
, ARRAY_SIZE(dst_chains
));
567 delbit(z
->dst_flags
, family
);
569 if (!(z
->dst_flags
& family_mask
))
570 fw3_set_running(z
, NULL
);
576 fw3_lookup_zone(struct fw3_state
*state
, const char *name
, bool running
)
580 if (list_empty(&state
->zones
))
583 list_for_each_entry(z
, &state
->zones
, list
)
585 if (strcmp(z
->name
, name
))
588 if (!running
|| z
->running_list
.next
)