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
),
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
),
84 print_chains(enum fw3_table table
, enum fw3_family family
,
85 const char *fmt
, const char *name
, uint16_t targets
,
86 const struct chain
*chains
, int n
)
90 const struct chain
*c
;
92 for (c
= chains
; n
> 0; c
++, n
--)
94 if (!fw3_is_family(c
, family
))
97 if (c
->table
!= table
)
100 if ((c
->target
!= FW3_TARGET_UNSPEC
) && !hasbit(targets
, c
->target
))
103 snprintf(cn
, sizeof(cn
), c
->name
, name
);
113 check_policy(struct uci_element
*e
, enum fw3_target
*pol
, enum fw3_target def
,
116 if (*pol
== FW3_TARGET_UNSPEC
)
118 warn_elem(e
, "has no %s policy specified, using default", name
);
121 else if (*pol
> FW3_TARGET_DROP
)
123 warn_elem(e
, "has invalid %s policy, using default", name
);
129 resolve_networks(struct uci_element
*e
, struct fw3_zone
*zone
)
131 struct fw3_device
*net
, *tmp
;
133 list_for_each_entry(net
, &zone
->networks
, list
)
135 tmp
= fw3_ubus_device(net
->name
);
139 warn_elem(e
, "cannot resolve device of network '%s'", net
->name
);
143 list_add_tail(&tmp
->list
, &zone
->devices
);
150 struct fw3_zone
*zone
;
152 zone
= malloc(sizeof(*zone
));
157 memset(zone
, 0, sizeof(*zone
));
159 INIT_LIST_HEAD(&zone
->networks
);
160 INIT_LIST_HEAD(&zone
->devices
);
161 INIT_LIST_HEAD(&zone
->subnets
);
162 INIT_LIST_HEAD(&zone
->masq_src
);
163 INIT_LIST_HEAD(&zone
->masq_dest
);
165 zone
->log_limit
.rate
= 10;
171 fw3_load_zones(struct fw3_state
*state
, struct uci_package
*p
)
173 struct uci_section
*s
;
174 struct uci_element
*e
;
175 struct fw3_zone
*zone
;
176 struct fw3_defaults
*defs
= &state
->defaults
;
178 INIT_LIST_HEAD(&state
->zones
);
180 uci_foreach_element(&p
->sections
, e
)
182 s
= uci_to_section(e
);
184 if (strcmp(s
->type
, "zone"))
187 zone
= fw3_alloc_zone();
192 fw3_parse_options(zone
, zone_opts
, ARRAY_SIZE(zone_opts
), s
);
194 if (!zone
->extra_dest
)
195 zone
->extra_dest
= zone
->extra_src
;
197 if (!zone
->name
|| !*zone
->name
)
199 warn_elem(e
, "has no name - ignoring");
204 if (list_empty(&zone
->networks
) && list_empty(&zone
->devices
) &&
205 list_empty(&zone
->subnets
) && !zone
->extra_src
)
207 warn_elem(e
, "has no device, network, subnet or extra options");
210 check_policy(e
, &zone
->policy_input
, defs
->policy_input
, "input");
211 check_policy(e
, &zone
->policy_output
, defs
->policy_output
, "output");
212 check_policy(e
, &zone
->policy_forward
, defs
->policy_forward
, "forward");
214 resolve_networks(e
, zone
);
218 setbit(zone
->dst_flags
, FW3_TARGET_SNAT
);
219 zone
->conntrack
= true;
222 setbit(zone
->src_flags
, zone
->policy_input
);
223 setbit(zone
->dst_flags
, zone
->policy_output
);
224 setbit(zone
->dst_flags
, zone
->policy_forward
);
226 list_add_tail(&zone
->list
, &state
->zones
);
232 print_zone_chain(enum fw3_table table
, enum fw3_family family
,
233 struct fw3_zone
*zone
, struct fw3_state
*state
)
237 if (!fw3_is_family(zone
, family
))
240 setbit(zone
->dst_flags
, family
);
242 if (!zone
->conntrack
&& !state
->defaults
.drop_invalid
)
243 setbit(zone
->dst_flags
, FW3_TARGET_NOTRACK
);
245 s
= print_chains(table
, family
, ":%s - [0:0]\n", zone
->name
,
246 zone
->src_flags
, src_chains
, ARRAY_SIZE(src_chains
));
248 d
= print_chains(table
, family
, ":%s - [0:0]\n", zone
->name
,
249 zone
->dst_flags
, dst_chains
, ARRAY_SIZE(dst_chains
));
253 info(" * Zone '%s'", zone
->name
);
254 fw3_set_running(zone
, &state
->running_zones
);
259 print_interface_rule(enum fw3_table table
, enum fw3_family family
,
260 struct fw3_zone
*zone
, struct fw3_device
*dev
,
261 struct fw3_address
*sub
, bool disable_notrack
)
265 #define jump_target(t) \
266 ((t == FW3_TARGET_REJECT) ? "reject" : fw3_flag_names[t])
268 if (table
== FW3_TABLE_FILTER
)
270 for (t
= FW3_TARGET_ACCEPT
; t
<= FW3_TARGET_DROP
; t
++)
272 if (hasbit(zone
->src_flags
, t
))
274 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
275 fw3_format_in_out(dev
, NULL
);
276 fw3_format_src_dest(sub
, NULL
);
277 fw3_format_extra(zone
->extra_src
);
278 fw3_pr(" -j %s\n", jump_target(t
));
281 if (hasbit(zone
->dst_flags
, t
))
283 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
284 fw3_format_in_out(NULL
, dev
);
285 fw3_format_src_dest(NULL
, sub
);
286 fw3_format_extra(zone
->extra_dest
);
287 fw3_pr(" -j %s\n", jump_target(t
));
291 fw3_pr("-A delegate_input");
292 fw3_format_in_out(dev
, NULL
);
293 fw3_format_src_dest(sub
, NULL
);
294 fw3_format_extra(zone
->extra_src
);
295 fw3_pr(" -j zone_%s_input\n", zone
->name
);
297 fw3_pr("-A delegate_forward");
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_forward\n", zone
->name
);
303 fw3_pr("-A delegate_output");
304 fw3_format_in_out(NULL
, dev
);
305 fw3_format_src_dest(NULL
, sub
);
306 fw3_format_extra(zone
->extra_dest
);
307 fw3_pr(" -j zone_%s_output\n", zone
->name
);
309 else if (table
== FW3_TABLE_NAT
)
311 if (hasbit(zone
->dst_flags
, FW3_TARGET_DNAT
))
313 fw3_pr("-A delegate_prerouting");
314 fw3_format_in_out(dev
, NULL
);
315 fw3_format_src_dest(sub
, NULL
);
316 fw3_format_extra(zone
->extra_src
);
317 fw3_pr(" -j zone_%s_prerouting\n", zone
->name
);
320 if (hasbit(zone
->dst_flags
, FW3_TARGET_SNAT
))
322 fw3_pr("-A delegate_postrouting");
323 fw3_format_in_out(NULL
, dev
);
324 fw3_format_src_dest(NULL
, sub
);
325 fw3_format_extra(zone
->extra_dest
);
326 fw3_pr(" -j zone_%s_postrouting\n", zone
->name
);
329 else if (table
== FW3_TABLE_MANGLE
)
336 fw3_format_in_out(NULL
, dev
);
337 fw3_format_src_dest(NULL
, sub
);
338 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
339 fw3_format_limit(&zone
->log_limit
);
340 fw3_format_comment(zone
->name
, " (mtu_fix logging)");
341 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone
->name
);
345 fw3_format_in_out(NULL
, dev
);
346 fw3_format_src_dest(NULL
, sub
);
347 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
348 fw3_format_comment(zone
->name
, " (mtu_fix)");
349 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
352 else if (table
== FW3_TABLE_RAW
)
354 if (!zone
->conntrack
&& !disable_notrack
)
356 fw3_pr("-A notrack");
357 fw3_format_in_out(dev
, NULL
);
358 fw3_format_src_dest(sub
, NULL
);
359 fw3_format_extra(zone
->extra_src
);
360 fw3_format_comment(zone
->name
, " (notrack)");
361 fw3_pr(" -j CT --notrack\n", zone
->name
);
367 print_interface_rules(enum fw3_table table
, enum fw3_family family
,
368 struct fw3_zone
*zone
, bool disable_notrack
)
370 struct fw3_device
*dev
;
371 struct fw3_address
*sub
;
373 fw3_foreach(dev
, &zone
->devices
)
374 fw3_foreach(sub
, &zone
->subnets
)
376 if (!fw3_is_family(sub
, family
))
382 print_interface_rule(table
, family
, zone
, dev
, sub
, disable_notrack
);
387 print_zone_rule(enum fw3_table table
, enum fw3_family family
,
388 struct fw3_zone
*zone
, bool disable_notrack
)
390 struct fw3_address
*msrc
;
391 struct fw3_address
*mdest
;
395 if (!fw3_is_family(zone
, family
))
400 case FW3_TABLE_FILTER
:
401 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
402 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_input
]);
404 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
405 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_forward
]);
407 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
408 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_output
]);
412 for (t
= FW3_TARGET_REJECT
; t
<= FW3_TARGET_DROP
; t
++)
414 if (hasbit(zone
->src_flags
, t
))
416 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
417 fw3_format_limit(&zone
->log_limit
);
418 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
419 fw3_flag_names
[t
], zone
->name
);
422 if (hasbit(zone
->dst_flags
, t
))
424 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
425 fw3_format_limit(&zone
->log_limit
);
426 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
427 fw3_flag_names
[t
], zone
->name
);
434 if (zone
->masq
&& family
== FW3_FAMILY_V4
)
436 fw3_foreach(msrc
, &zone
->masq_src
)
437 fw3_foreach(mdest
, &zone
->masq_dest
)
439 fw3_pr("-A zone_%s_postrouting ", zone
->name
);
440 fw3_format_src_dest(msrc
, mdest
);
441 fw3_pr("-j MASQUERADE\n");
447 case FW3_TABLE_MANGLE
:
451 print_interface_rules(table
, family
, zone
, disable_notrack
);
455 fw3_print_zone_chains(enum fw3_table table
, enum fw3_family family
,
456 struct fw3_state
*state
)
458 struct fw3_zone
*zone
;
460 list_for_each_entry(zone
, &state
->zones
, list
)
461 print_zone_chain(table
, family
, zone
, state
);
465 fw3_print_zone_rules(enum fw3_table table
, enum fw3_family family
,
466 struct fw3_state
*state
)
468 struct fw3_zone
*zone
;
470 list_for_each_entry(zone
, &state
->zones
, list
)
471 print_zone_rule(table
, family
, zone
, state
->defaults
.drop_invalid
);
475 fw3_flush_zones(enum fw3_table table
, enum fw3_family family
,
476 bool pass2
, struct fw3_state
*state
)
478 struct fw3_zone
*z
, *tmp
;
479 int mask
= (1 << FW3_FAMILY_V4
) | (1 << FW3_FAMILY_V6
);
481 list_for_each_entry_safe(z
, tmp
, &state
->running_zones
, running_list
)
483 if (!hasbit(z
->dst_flags
, family
))
486 print_chains(table
, family
, pass2
? "-X %s\n" : "-F %s\n",
487 z
->name
, z
->src_flags
, src_chains
, ARRAY_SIZE(src_chains
));
489 print_chains(table
, family
, pass2
? "-X %s\n" : "-F %s\n",
490 z
->name
, z
->dst_flags
, dst_chains
, ARRAY_SIZE(dst_chains
));
494 delbit(z
->dst_flags
, family
);
496 if (!(z
->dst_flags
& mask
))
497 fw3_set_running(z
, NULL
);
503 fw3_lookup_zone(struct fw3_state
*state
, const char *name
, bool running
)
507 if (list_empty(&state
->zones
))
510 list_for_each_entry(z
, &state
->zones
, list
)
512 if (strcmp(z
->name
, name
))
515 if (!running
|| z
->running_list
.next
)
525 fw3_free_zone(struct fw3_zone
*zone
)
527 fw3_free_list(&zone
->networks
);
528 fw3_free_list(&zone
->devices
);
529 fw3_free_list(&zone
->subnets
);
531 fw3_free_list(&zone
->masq_src
);
532 fw3_free_list(&zone
->masq_dest
);