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"),
52 const struct fw3_option fw3_zone_opts
[] = {
53 FW3_OPT("enabled", bool, zone
, enabled
),
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
->enabled
= true;
168 zone
->log_limit
.rate
= 10;
174 fw3_load_zones(struct fw3_state
*state
, struct uci_package
*p
)
176 struct uci_section
*s
;
177 struct uci_element
*e
;
178 struct fw3_zone
*zone
;
179 struct fw3_defaults
*defs
= &state
->defaults
;
181 INIT_LIST_HEAD(&state
->zones
);
183 uci_foreach_element(&p
->sections
, e
)
185 s
= uci_to_section(e
);
187 if (strcmp(s
->type
, "zone"))
190 zone
= fw3_alloc_zone();
195 fw3_parse_options(zone
, fw3_zone_opts
, s
);
203 if (!zone
->extra_dest
)
204 zone
->extra_dest
= zone
->extra_src
;
206 if (!zone
->name
|| !*zone
->name
)
208 warn_elem(e
, "has no name - ignoring");
213 if (list_empty(&zone
->networks
) && list_empty(&zone
->devices
) &&
214 list_empty(&zone
->subnets
) && !zone
->extra_src
)
216 warn_elem(e
, "has no device, network, subnet or extra options");
219 check_policy(e
, &zone
->policy_input
, defs
->policy_input
, "input");
220 check_policy(e
, &zone
->policy_output
, defs
->policy_output
, "output");
221 check_policy(e
, &zone
->policy_forward
, defs
->policy_forward
, "forward");
223 resolve_networks(e
, zone
);
227 setbit(zone
->dst_flags
, FW3_TARGET_SNAT
);
228 zone
->conntrack
= true;
231 setbit(zone
->src_flags
, zone
->policy_input
);
232 setbit(zone
->dst_flags
, zone
->policy_output
);
233 setbit(zone
->dst_flags
, zone
->policy_forward
);
235 list_add_tail(&zone
->list
, &state
->zones
);
241 print_zone_chain(enum fw3_table table
, enum fw3_family family
,
242 struct fw3_zone
*zone
, struct fw3_state
*state
)
246 if (!fw3_is_family(zone
, family
))
249 setbit(zone
->dst_flags
, family
);
251 if (!zone
->conntrack
&& !state
->defaults
.drop_invalid
)
252 setbit(zone
->dst_flags
, FW3_TARGET_NOTRACK
);
254 s
= print_chains(table
, family
, ":%s - [0:0]\n", zone
->name
,
255 zone
->src_flags
, src_chains
, ARRAY_SIZE(src_chains
));
257 d
= print_chains(table
, family
, ":%s - [0:0]\n", zone
->name
,
258 zone
->dst_flags
, dst_chains
, ARRAY_SIZE(dst_chains
));
262 info(" * Zone '%s'", zone
->name
);
263 fw3_set_running(zone
, &state
->running_zones
);
268 print_interface_rule(enum fw3_table table
, enum fw3_family family
,
269 struct fw3_zone
*zone
, struct fw3_device
*dev
,
270 struct fw3_address
*sub
, bool disable_notrack
)
274 #define jump_target(t) \
275 ((t == FW3_TARGET_REJECT) ? "reject" : fw3_flag_names[t])
277 if (table
== FW3_TABLE_FILTER
)
279 for (t
= FW3_TARGET_ACCEPT
; t
<= FW3_TARGET_DROP
; t
++)
281 if (hasbit(zone
->src_flags
, t
))
283 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
284 fw3_format_in_out(dev
, NULL
);
285 fw3_format_src_dest(sub
, NULL
);
286 fw3_format_extra(zone
->extra_src
);
287 fw3_pr(" -j %s\n", jump_target(t
));
290 if (hasbit(zone
->dst_flags
, t
))
292 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
293 fw3_format_in_out(NULL
, dev
);
294 fw3_format_src_dest(NULL
, sub
);
295 fw3_format_extra(zone
->extra_dest
);
296 fw3_pr(" -j %s\n", jump_target(t
));
300 fw3_pr("-A delegate_input");
301 fw3_format_in_out(dev
, NULL
);
302 fw3_format_src_dest(sub
, NULL
);
303 fw3_format_extra(zone
->extra_src
);
304 fw3_pr(" -j zone_%s_input\n", zone
->name
);
306 fw3_pr("-A delegate_forward");
307 fw3_format_in_out(dev
, NULL
);
308 fw3_format_src_dest(sub
, NULL
);
309 fw3_format_extra(zone
->extra_src
);
310 fw3_pr(" -j zone_%s_forward\n", zone
->name
);
312 fw3_pr("-A delegate_output");
313 fw3_format_in_out(NULL
, dev
);
314 fw3_format_src_dest(NULL
, sub
);
315 fw3_format_extra(zone
->extra_dest
);
316 fw3_pr(" -j zone_%s_output\n", zone
->name
);
318 else if (table
== FW3_TABLE_NAT
)
320 if (hasbit(zone
->dst_flags
, FW3_TARGET_DNAT
))
322 fw3_pr("-A delegate_prerouting");
323 fw3_format_in_out(dev
, NULL
);
324 fw3_format_src_dest(sub
, NULL
);
325 fw3_format_extra(zone
->extra_src
);
326 fw3_pr(" -j zone_%s_prerouting\n", zone
->name
);
329 if (hasbit(zone
->dst_flags
, FW3_TARGET_SNAT
))
331 fw3_pr("-A delegate_postrouting");
332 fw3_format_in_out(NULL
, dev
);
333 fw3_format_src_dest(NULL
, sub
);
334 fw3_format_extra(zone
->extra_dest
);
335 fw3_pr(" -j zone_%s_postrouting\n", zone
->name
);
338 else if (table
== FW3_TABLE_MANGLE
)
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_limit(&zone
->log_limit
);
349 fw3_format_comment(zone
->name
, " (mtu_fix logging)");
350 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone
->name
);
354 fw3_format_in_out(NULL
, dev
);
355 fw3_format_src_dest(NULL
, sub
);
356 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
357 fw3_format_comment(zone
->name
, " (mtu_fix)");
358 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
361 else if (table
== FW3_TABLE_RAW
)
363 if (!zone
->conntrack
&& !disable_notrack
)
365 fw3_pr("-A notrack");
366 fw3_format_in_out(dev
, NULL
);
367 fw3_format_src_dest(sub
, NULL
);
368 fw3_format_extra(zone
->extra_src
);
369 fw3_format_comment(zone
->name
, " (notrack)");
370 fw3_pr(" -j CT --notrack\n", zone
->name
);
376 print_interface_rules(enum fw3_table table
, enum fw3_family family
,
377 struct fw3_zone
*zone
, bool disable_notrack
)
379 struct fw3_device
*dev
;
380 struct fw3_address
*sub
;
382 fw3_foreach(dev
, &zone
->devices
)
383 fw3_foreach(sub
, &zone
->subnets
)
385 if (!fw3_is_family(sub
, family
))
391 print_interface_rule(table
, family
, zone
, dev
, sub
, disable_notrack
);
396 print_zone_rule(enum fw3_table table
, enum fw3_family family
,
397 struct fw3_zone
*zone
, bool disable_notrack
)
399 struct fw3_address
*msrc
;
400 struct fw3_address
*mdest
;
404 if (!fw3_is_family(zone
, family
))
409 case FW3_TABLE_FILTER
:
410 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
411 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_input
]);
413 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
414 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_forward
]);
416 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
417 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_output
]);
421 for (t
= FW3_TARGET_REJECT
; t
<= FW3_TARGET_DROP
; t
++)
423 if (hasbit(zone
->src_flags
, t
))
425 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
426 fw3_format_limit(&zone
->log_limit
);
427 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
428 fw3_flag_names
[t
], zone
->name
);
431 if (hasbit(zone
->dst_flags
, t
))
433 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
434 fw3_format_limit(&zone
->log_limit
);
435 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
436 fw3_flag_names
[t
], zone
->name
);
443 if (zone
->masq
&& family
== FW3_FAMILY_V4
)
445 fw3_foreach(msrc
, &zone
->masq_src
)
446 fw3_foreach(mdest
, &zone
->masq_dest
)
448 fw3_pr("-A zone_%s_postrouting ", zone
->name
);
449 fw3_format_src_dest(msrc
, mdest
);
450 fw3_pr("-j MASQUERADE\n");
456 case FW3_TABLE_MANGLE
:
460 print_interface_rules(table
, family
, zone
, disable_notrack
);
464 fw3_print_zone_chains(enum fw3_table table
, enum fw3_family family
,
465 struct fw3_state
*state
)
467 struct fw3_zone
*zone
;
469 list_for_each_entry(zone
, &state
->zones
, list
)
470 print_zone_chain(table
, family
, zone
, state
);
474 fw3_print_zone_rules(enum fw3_table table
, enum fw3_family family
,
475 struct fw3_state
*state
)
477 struct fw3_zone
*zone
;
479 list_for_each_entry(zone
, &state
->zones
, list
)
480 print_zone_rule(table
, family
, zone
, state
->defaults
.drop_invalid
);
484 fw3_flush_zones(enum fw3_table table
, enum fw3_family family
,
485 bool pass2
, struct fw3_state
*state
)
487 struct fw3_zone
*z
, *tmp
;
488 int mask
= (1 << FW3_FAMILY_V4
) | (1 << FW3_FAMILY_V6
);
490 list_for_each_entry_safe(z
, tmp
, &state
->running_zones
, running_list
)
492 if (!hasbit(z
->dst_flags
, family
))
495 print_chains(table
, family
, pass2
? "-X %s\n" : "-F %s\n",
496 z
->name
, z
->src_flags
, src_chains
, ARRAY_SIZE(src_chains
));
498 print_chains(table
, family
, pass2
? "-X %s\n" : "-F %s\n",
499 z
->name
, z
->dst_flags
, dst_chains
, ARRAY_SIZE(dst_chains
));
503 delbit(z
->dst_flags
, family
);
505 if (!(z
->dst_flags
& mask
))
506 fw3_set_running(z
, NULL
);
512 fw3_lookup_zone(struct fw3_state
*state
, const char *name
, bool running
)
516 if (list_empty(&state
->zones
))
519 list_for_each_entry(z
, &state
->zones
, list
)
521 if (strcmp(z
->name
, name
))
524 if (!running
|| z
->running_list
.next
)