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 const struct fw3_option fw3_zone_opts
[] = {
55 FW3_OPT("name", string
, zone
, name
),
56 FW3_OPT("family", family
, zone
, family
),
58 FW3_LIST("network", device
, zone
, networks
),
59 FW3_LIST("device", device
, zone
, devices
),
60 FW3_LIST("subnet", address
, zone
, subnets
),
62 FW3_OPT("input", target
, zone
, policy_input
),
63 FW3_OPT("forward", target
, zone
, policy_forward
),
64 FW3_OPT("output", target
, zone
, policy_output
),
66 FW3_OPT("masq", bool, zone
, masq
),
67 FW3_LIST("masq_src", address
, zone
, masq_src
),
68 FW3_LIST("masq_dest", address
, zone
, masq_dest
),
70 FW3_OPT("extra", string
, zone
, extra_src
),
71 FW3_OPT("extra_src", string
, zone
, extra_src
),
72 FW3_OPT("extra_dest", string
, zone
, extra_dest
),
74 FW3_OPT("conntrack", bool, zone
, conntrack
),
75 FW3_OPT("mtu_fix", bool, zone
, mtu_fix
),
76 FW3_OPT("custom_chains", bool, zone
, custom_chains
),
78 FW3_OPT("log", bool, zone
, log
),
79 FW3_OPT("log_limit", limit
, zone
, log_limit
),
86 print_chains(enum fw3_table table
, enum fw3_family family
,
87 const char *fmt
, const char *name
, uint16_t targets
,
88 const struct chain
*chains
, int n
)
92 const struct chain
*c
;
94 for (c
= chains
; n
> 0; c
++, n
--)
96 if (!fw3_is_family(c
, family
))
99 if (c
->table
!= table
)
102 if ((c
->target
!= FW3_TARGET_UNSPEC
) && !hasbit(targets
, c
->target
))
105 snprintf(cn
, sizeof(cn
), c
->name
, name
);
115 check_policy(struct uci_element
*e
, enum fw3_target
*pol
, enum fw3_target def
,
118 if (*pol
== FW3_TARGET_UNSPEC
)
120 warn_elem(e
, "has no %s policy specified, using default", name
);
123 else if (*pol
> FW3_TARGET_DROP
)
125 warn_elem(e
, "has invalid %s policy, using default", name
);
131 resolve_networks(struct uci_element
*e
, struct fw3_zone
*zone
)
133 struct fw3_device
*net
, *tmp
;
135 list_for_each_entry(net
, &zone
->networks
, list
)
137 tmp
= fw3_ubus_device(net
->name
);
141 warn_elem(e
, "cannot resolve device of network '%s'", net
->name
);
145 list_add_tail(&tmp
->list
, &zone
->devices
);
152 struct fw3_zone
*zone
;
154 zone
= malloc(sizeof(*zone
));
159 memset(zone
, 0, sizeof(*zone
));
161 INIT_LIST_HEAD(&zone
->networks
);
162 INIT_LIST_HEAD(&zone
->devices
);
163 INIT_LIST_HEAD(&zone
->subnets
);
164 INIT_LIST_HEAD(&zone
->masq_src
);
165 INIT_LIST_HEAD(&zone
->masq_dest
);
167 zone
->log_limit
.rate
= 10;
173 fw3_load_zones(struct fw3_state
*state
, struct uci_package
*p
)
175 struct uci_section
*s
;
176 struct uci_element
*e
;
177 struct fw3_zone
*zone
;
178 struct fw3_defaults
*defs
= &state
->defaults
;
180 INIT_LIST_HEAD(&state
->zones
);
182 uci_foreach_element(&p
->sections
, e
)
184 s
= uci_to_section(e
);
186 if (strcmp(s
->type
, "zone"))
189 zone
= fw3_alloc_zone();
194 fw3_parse_options(zone
, fw3_zone_opts
, s
);
196 if (!zone
->extra_dest
)
197 zone
->extra_dest
= zone
->extra_src
;
199 if (!zone
->name
|| !*zone
->name
)
201 warn_elem(e
, "has no name - ignoring");
206 if (list_empty(&zone
->networks
) && list_empty(&zone
->devices
) &&
207 list_empty(&zone
->subnets
) && !zone
->extra_src
)
209 warn_elem(e
, "has no device, network, subnet or extra options");
212 check_policy(e
, &zone
->policy_input
, defs
->policy_input
, "input");
213 check_policy(e
, &zone
->policy_output
, defs
->policy_output
, "output");
214 check_policy(e
, &zone
->policy_forward
, defs
->policy_forward
, "forward");
216 resolve_networks(e
, zone
);
220 setbit(zone
->dst_flags
, FW3_TARGET_SNAT
);
221 zone
->conntrack
= true;
224 setbit(zone
->src_flags
, zone
->policy_input
);
225 setbit(zone
->dst_flags
, zone
->policy_output
);
226 setbit(zone
->dst_flags
, zone
->policy_forward
);
228 list_add_tail(&zone
->list
, &state
->zones
);
234 print_zone_chain(enum fw3_table table
, enum fw3_family family
,
235 struct fw3_zone
*zone
, struct fw3_state
*state
)
239 if (!fw3_is_family(zone
, family
))
242 setbit(zone
->dst_flags
, family
);
244 if (!zone
->conntrack
&& !state
->defaults
.drop_invalid
)
245 setbit(zone
->dst_flags
, FW3_TARGET_NOTRACK
);
247 s
= print_chains(table
, family
, ":%s - [0:0]\n", zone
->name
,
248 zone
->src_flags
, src_chains
, ARRAY_SIZE(src_chains
));
250 d
= print_chains(table
, family
, ":%s - [0:0]\n", zone
->name
,
251 zone
->dst_flags
, dst_chains
, ARRAY_SIZE(dst_chains
));
255 info(" * Zone '%s'", zone
->name
);
256 fw3_set_running(zone
, &state
->running_zones
);
261 print_interface_rule(enum fw3_table table
, enum fw3_family family
,
262 struct fw3_zone
*zone
, struct fw3_device
*dev
,
263 struct fw3_address
*sub
, bool disable_notrack
)
267 #define jump_target(t) \
268 ((t == FW3_TARGET_REJECT) ? "reject" : fw3_flag_names[t])
270 if (table
== FW3_TABLE_FILTER
)
272 for (t
= FW3_TARGET_ACCEPT
; t
<= FW3_TARGET_DROP
; t
++)
274 if (hasbit(zone
->src_flags
, t
))
276 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
277 fw3_format_in_out(dev
, NULL
);
278 fw3_format_src_dest(sub
, NULL
);
279 fw3_format_extra(zone
->extra_src
);
280 fw3_pr(" -j %s\n", jump_target(t
));
283 if (hasbit(zone
->dst_flags
, t
))
285 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
286 fw3_format_in_out(NULL
, dev
);
287 fw3_format_src_dest(NULL
, sub
);
288 fw3_format_extra(zone
->extra_dest
);
289 fw3_pr(" -j %s\n", jump_target(t
));
293 fw3_pr("-A delegate_input");
294 fw3_format_in_out(dev
, NULL
);
295 fw3_format_src_dest(sub
, NULL
);
296 fw3_format_extra(zone
->extra_src
);
297 fw3_pr(" -j zone_%s_input\n", zone
->name
);
299 fw3_pr("-A delegate_forward");
300 fw3_format_in_out(dev
, NULL
);
301 fw3_format_src_dest(sub
, NULL
);
302 fw3_format_extra(zone
->extra_src
);
303 fw3_pr(" -j zone_%s_forward\n", zone
->name
);
305 fw3_pr("-A delegate_output");
306 fw3_format_in_out(NULL
, dev
);
307 fw3_format_src_dest(NULL
, sub
);
308 fw3_format_extra(zone
->extra_dest
);
309 fw3_pr(" -j zone_%s_output\n", zone
->name
);
311 else if (table
== FW3_TABLE_NAT
)
313 if (hasbit(zone
->dst_flags
, FW3_TARGET_DNAT
))
315 fw3_pr("-A delegate_prerouting");
316 fw3_format_in_out(dev
, NULL
);
317 fw3_format_src_dest(sub
, NULL
);
318 fw3_format_extra(zone
->extra_src
);
319 fw3_pr(" -j zone_%s_prerouting\n", zone
->name
);
322 if (hasbit(zone
->dst_flags
, FW3_TARGET_SNAT
))
324 fw3_pr("-A delegate_postrouting");
325 fw3_format_in_out(NULL
, dev
);
326 fw3_format_src_dest(NULL
, sub
);
327 fw3_format_extra(zone
->extra_dest
);
328 fw3_pr(" -j zone_%s_postrouting\n", zone
->name
);
331 else if (table
== FW3_TABLE_MANGLE
)
338 fw3_format_in_out(NULL
, dev
);
339 fw3_format_src_dest(NULL
, sub
);
340 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
341 fw3_format_limit(&zone
->log_limit
);
342 fw3_format_comment(zone
->name
, " (mtu_fix logging)");
343 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone
->name
);
347 fw3_format_in_out(NULL
, dev
);
348 fw3_format_src_dest(NULL
, sub
);
349 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
350 fw3_format_comment(zone
->name
, " (mtu_fix)");
351 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
354 else if (table
== FW3_TABLE_RAW
)
356 if (!zone
->conntrack
&& !disable_notrack
)
358 fw3_pr("-A notrack");
359 fw3_format_in_out(dev
, NULL
);
360 fw3_format_src_dest(sub
, NULL
);
361 fw3_format_extra(zone
->extra_src
);
362 fw3_format_comment(zone
->name
, " (notrack)");
363 fw3_pr(" -j CT --notrack\n", zone
->name
);
369 print_interface_rules(enum fw3_table table
, enum fw3_family family
,
370 struct fw3_zone
*zone
, bool disable_notrack
)
372 struct fw3_device
*dev
;
373 struct fw3_address
*sub
;
375 fw3_foreach(dev
, &zone
->devices
)
376 fw3_foreach(sub
, &zone
->subnets
)
378 if (!fw3_is_family(sub
, family
))
384 print_interface_rule(table
, family
, zone
, dev
, sub
, disable_notrack
);
389 print_zone_rule(enum fw3_table table
, enum fw3_family family
,
390 struct fw3_zone
*zone
, bool disable_notrack
)
392 struct fw3_address
*msrc
;
393 struct fw3_address
*mdest
;
397 if (!fw3_is_family(zone
, family
))
402 case FW3_TABLE_FILTER
:
403 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
404 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_input
]);
406 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
407 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_forward
]);
409 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
410 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_output
]);
414 for (t
= FW3_TARGET_REJECT
; t
<= FW3_TARGET_DROP
; t
++)
416 if (hasbit(zone
->src_flags
, t
))
418 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
419 fw3_format_limit(&zone
->log_limit
);
420 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
421 fw3_flag_names
[t
], zone
->name
);
424 if (hasbit(zone
->dst_flags
, t
))
426 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
427 fw3_format_limit(&zone
->log_limit
);
428 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
429 fw3_flag_names
[t
], zone
->name
);
436 if (zone
->masq
&& family
== FW3_FAMILY_V4
)
438 fw3_foreach(msrc
, &zone
->masq_src
)
439 fw3_foreach(mdest
, &zone
->masq_dest
)
441 fw3_pr("-A zone_%s_postrouting ", zone
->name
);
442 fw3_format_src_dest(msrc
, mdest
);
443 fw3_pr("-j MASQUERADE\n");
449 case FW3_TABLE_MANGLE
:
453 print_interface_rules(table
, family
, zone
, disable_notrack
);
457 fw3_print_zone_chains(enum fw3_table table
, enum fw3_family family
,
458 struct fw3_state
*state
)
460 struct fw3_zone
*zone
;
462 list_for_each_entry(zone
, &state
->zones
, list
)
463 print_zone_chain(table
, family
, zone
, state
);
467 fw3_print_zone_rules(enum fw3_table table
, enum fw3_family family
,
468 struct fw3_state
*state
)
470 struct fw3_zone
*zone
;
472 list_for_each_entry(zone
, &state
->zones
, list
)
473 print_zone_rule(table
, family
, zone
, state
->defaults
.drop_invalid
);
477 fw3_flush_zones(enum fw3_table table
, enum fw3_family family
,
478 bool pass2
, struct fw3_state
*state
)
480 struct fw3_zone
*z
, *tmp
;
481 int mask
= (1 << FW3_FAMILY_V4
) | (1 << FW3_FAMILY_V6
);
483 list_for_each_entry_safe(z
, tmp
, &state
->running_zones
, running_list
)
485 if (!hasbit(z
->dst_flags
, family
))
488 print_chains(table
, family
, pass2
? "-X %s\n" : "-F %s\n",
489 z
->name
, z
->src_flags
, src_chains
, ARRAY_SIZE(src_chains
));
491 print_chains(table
, family
, pass2
? "-X %s\n" : "-F %s\n",
492 z
->name
, z
->dst_flags
, dst_chains
, ARRAY_SIZE(dst_chains
));
496 delbit(z
->dst_flags
, family
);
498 if (!(z
->dst_flags
& mask
))
499 fw3_set_running(z
, NULL
);
505 fw3_lookup_zone(struct fw3_state
*state
, const char *name
, bool running
)
509 if (list_empty(&state
->zones
))
512 list_for_each_entry(z
, &state
->zones
, list
)
514 if (strcmp(z
->name
, name
))
517 if (!running
|| z
->running_list
.next
)