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, fmt) \
24 { FW3_FAMILY_##f, FW3_TABLE_##tbl, FW3_FLAG_##tgt, fmt }
26 static const struct fw3_rule_spec zone_chains
[] = {
27 C(ANY
, FILTER
, UNSPEC
, "zone_%1$s_input"),
28 C(ANY
, FILTER
, UNSPEC
, "zone_%1$s_output"),
29 C(ANY
, FILTER
, UNSPEC
, "zone_%1$s_forward"),
31 C(ANY
, FILTER
, SRC_ACCEPT
, "zone_%1$s_src_ACCEPT"),
32 C(ANY
, FILTER
, SRC_REJECT
, "zone_%1$s_src_REJECT"),
33 C(ANY
, FILTER
, SRC_DROP
, "zone_%1$s_src_DROP"),
35 C(ANY
, FILTER
, ACCEPT
, "zone_%1$s_dest_ACCEPT"),
36 C(ANY
, FILTER
, REJECT
, "zone_%1$s_dest_REJECT"),
37 C(ANY
, FILTER
, DROP
, "zone_%1$s_dest_DROP"),
39 C(V4
, NAT
, SNAT
, "zone_%1$s_postrouting"),
40 C(V4
, NAT
, DNAT
, "zone_%1$s_prerouting"),
42 C(ANY
, FILTER
, CUSTOM_CHAINS
, "input_%1$s_rule"),
43 C(ANY
, FILTER
, CUSTOM_CHAINS
, "output_%1$s_rule"),
44 C(ANY
, FILTER
, CUSTOM_CHAINS
, "forwarding_%1$s_rule"),
46 C(V4
, NAT
, CUSTOM_CHAINS
, "prerouting_%1$s_rule"),
47 C(V4
, NAT
, CUSTOM_CHAINS
, "postrouting_%1$s_rule"),
53 #define R(dir1, dir2) \
54 "zone_%1$s_" #dir1 " -m comment --comment \"user chain for %1$s " \
55 #dir2 "\" -j " #dir2 "_%1$s_rule"
57 static const struct fw3_rule_spec zone_rules
[] = {
58 C(ANY
, FILTER
, CUSTOM_CHAINS
, R(input
, input
)),
59 C(ANY
, FILTER
, CUSTOM_CHAINS
, R(output
, output
)),
60 C(ANY
, FILTER
, CUSTOM_CHAINS
, R(forward
, forwarding
)),
62 C(V4
, NAT
, CUSTOM_CHAINS
, R(prerouting
, prerouting
)),
63 C(V4
, NAT
, CUSTOM_CHAINS
, R(postrouting
, postrouting
)),
68 const struct fw3_option fw3_zone_opts
[] = {
69 FW3_OPT("enabled", bool, zone
, enabled
),
71 FW3_OPT("name", string
, zone
, name
),
72 FW3_OPT("family", family
, zone
, family
),
74 FW3_LIST("network", device
, zone
, networks
),
75 FW3_LIST("device", device
, zone
, devices
),
76 FW3_LIST("subnet", network
, zone
, subnets
),
78 FW3_OPT("input", target
, zone
, policy_input
),
79 FW3_OPT("forward", target
, zone
, policy_forward
),
80 FW3_OPT("output", target
, zone
, policy_output
),
82 FW3_OPT("masq", bool, zone
, masq
),
83 FW3_LIST("masq_src", network
, zone
, masq_src
),
84 FW3_LIST("masq_dest", network
, zone
, masq_dest
),
86 FW3_OPT("extra", string
, zone
, extra_src
),
87 FW3_OPT("extra_src", string
, zone
, extra_src
),
88 FW3_OPT("extra_dest", string
, zone
, extra_dest
),
90 FW3_OPT("conntrack", bool, zone
, conntrack
),
91 FW3_OPT("mtu_fix", bool, zone
, mtu_fix
),
92 FW3_OPT("custom_chains", bool, zone
, custom_chains
),
94 FW3_OPT("log", bool, zone
, log
),
95 FW3_OPT("log_limit", limit
, zone
, log_limit
),
97 FW3_OPT("__flags_v4", int, zone
, flags
[0]),
98 FW3_OPT("__flags_v6", int, zone
, flags
[1]),
105 check_policy(struct uci_element
*e
, enum fw3_flag
*pol
, enum fw3_flag def
,
108 if (*pol
== FW3_FLAG_UNSPEC
)
110 warn_elem(e
, "has no %s policy specified, using default", name
);
113 else if (*pol
> FW3_FLAG_DROP
)
115 warn_elem(e
, "has invalid %s policy, using default", name
);
121 resolve_networks(struct uci_element
*e
, struct fw3_zone
*zone
)
123 struct fw3_device
*net
, *tmp
;
125 list_for_each_entry(net
, &zone
->networks
, list
)
127 tmp
= fw3_ubus_device(net
->name
);
131 warn_elem(e
, "cannot resolve device of network '%s'", net
->name
);
135 snprintf(tmp
->network
, sizeof(tmp
->network
), "%s", net
->name
);
136 list_add_tail(&tmp
->list
, &zone
->devices
);
143 struct fw3_zone
*zone
;
145 zone
= malloc(sizeof(*zone
));
150 memset(zone
, 0, sizeof(*zone
));
152 INIT_LIST_HEAD(&zone
->networks
);
153 INIT_LIST_HEAD(&zone
->devices
);
154 INIT_LIST_HEAD(&zone
->subnets
);
155 INIT_LIST_HEAD(&zone
->masq_src
);
156 INIT_LIST_HEAD(&zone
->masq_dest
);
158 zone
->enabled
= true;
159 zone
->custom_chains
= true;
160 zone
->log_limit
.rate
= 10;
166 fw3_load_zones(struct fw3_state
*state
, struct uci_package
*p
)
168 struct uci_section
*s
;
169 struct uci_element
*e
;
170 struct fw3_zone
*zone
;
171 struct fw3_defaults
*defs
= &state
->defaults
;
173 INIT_LIST_HEAD(&state
->zones
);
175 uci_foreach_element(&p
->sections
, e
)
177 s
= uci_to_section(e
);
179 if (strcmp(s
->type
, "zone"))
182 zone
= fw3_alloc_zone();
187 fw3_parse_options(zone
, fw3_zone_opts
, s
);
195 if (!zone
->extra_dest
)
196 zone
->extra_dest
= zone
->extra_src
;
198 if (!defs
->custom_chains
&& zone
->custom_chains
)
199 zone
->custom_chains
= false;
201 if (!zone
->name
|| !*zone
->name
)
203 warn_elem(e
, "has no name - ignoring");
208 if (list_empty(&zone
->networks
) && list_empty(&zone
->devices
) &&
209 list_empty(&zone
->subnets
) && !zone
->extra_src
)
211 warn_elem(e
, "has no device, network, subnet or extra options");
214 check_policy(e
, &zone
->policy_input
, defs
->policy_input
, "input");
215 check_policy(e
, &zone
->policy_output
, defs
->policy_output
, "output");
216 check_policy(e
, &zone
->policy_forward
, defs
->policy_forward
, "forward");
218 resolve_networks(e
, zone
);
222 setbit(zone
->flags
[0], FW3_FLAG_SNAT
);
223 zone
->conntrack
= true;
226 if (zone
->custom_chains
)
228 setbit(zone
->flags
[0], FW3_FLAG_SNAT
);
229 setbit(zone
->flags
[0], FW3_FLAG_DNAT
);
232 setbit(zone
->flags
[0], fw3_to_src_target(zone
->policy_input
));
233 setbit(zone
->flags
[0], zone
->policy_output
);
234 setbit(zone
->flags
[0], zone
->policy_forward
);
236 setbit(zone
->flags
[1], fw3_to_src_target(zone
->policy_input
));
237 setbit(zone
->flags
[1], zone
->policy_output
);
238 setbit(zone
->flags
[1], zone
->policy_forward
);
240 list_add_tail(&zone
->list
, &state
->zones
);
246 print_zone_chain(struct fw3_state
*state
, enum fw3_family family
,
247 enum fw3_table table
, bool reload
, struct fw3_zone
*zone
)
250 uint32_t custom_mask
= ~0;
252 if (!fw3_is_family(zone
, family
))
255 set(zone
->flags
, family
, table
);
257 /* Don't touch user chains on reload */
259 delbit(custom_mask
, FW3_FLAG_CUSTOM_CHAINS
);
261 if (zone
->custom_chains
)
262 set(zone
->flags
, family
, FW3_FLAG_CUSTOM_CHAINS
);
264 if (!zone
->conntrack
&& !state
->defaults
.drop_invalid
)
265 set(zone
->flags
, family
, FW3_FLAG_NOTRACK
);
267 c
= fw3_pr_rulespec(table
, family
, zone
->flags
, custom_mask
, zone_chains
,
268 ":%s - [0:0]\n", zone
->name
);
270 r
= fw3_pr_rulespec(table
, family
, zone
->flags
, 0, zone_rules
,
271 "-A %s\n", zone
->name
);
275 info(" * Zone '%s'", zone
->name
);
277 set(zone
->flags
, family
, table
);
282 print_interface_rule(struct fw3_state
*state
, enum fw3_family family
,
283 enum fw3_table table
, bool reload
, struct fw3_zone
*zone
,
284 struct fw3_device
*dev
, struct fw3_address
*sub
)
286 bool disable_notrack
= state
->defaults
.drop_invalid
;
290 #define jump_target(t) \
291 ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
293 if (table
== FW3_TABLE_FILTER
)
295 for (t
= FW3_FLAG_ACCEPT
; t
<= FW3_FLAG_DROP
; t
++)
297 if (has(zone
->flags
, family
, fw3_to_src_target(t
)))
299 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
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 %s\n", jump_target(t
));
306 if (has(zone
->flags
, family
, t
))
308 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
309 fw3_format_in_out(NULL
, dev
);
310 fw3_format_src_dest(NULL
, sub
);
311 fw3_format_extra(zone
->extra_dest
);
312 fw3_pr(" -j %s\n", jump_target(t
));
316 fw3_pr("-A delegate_input");
317 fw3_format_in_out(dev
, NULL
);
318 fw3_format_src_dest(sub
, NULL
);
319 fw3_format_extra(zone
->extra_src
);
320 fw3_pr(" -j zone_%s_input\n", zone
->name
);
322 fw3_pr("-A delegate_forward");
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_forward\n", zone
->name
);
328 fw3_pr("-A delegate_output");
329 fw3_format_in_out(NULL
, dev
);
330 fw3_format_src_dest(NULL
, sub
);
331 fw3_format_extra(zone
->extra_dest
);
332 fw3_pr(" -j zone_%s_output\n", zone
->name
);
334 else if (table
== FW3_TABLE_NAT
)
336 if (has(zone
->flags
, family
, FW3_FLAG_DNAT
))
338 fw3_pr("-A delegate_prerouting");
339 fw3_format_in_out(dev
, NULL
);
340 fw3_format_src_dest(sub
, NULL
);
341 fw3_format_extra(zone
->extra_src
);
342 fw3_pr(" -j zone_%s_prerouting\n", zone
->name
);
345 if (has(zone
->flags
, family
, FW3_FLAG_SNAT
))
347 fw3_pr("-A delegate_postrouting");
348 fw3_format_in_out(NULL
, dev
);
349 fw3_format_src_dest(NULL
, sub
);
350 fw3_format_extra(zone
->extra_dest
);
351 fw3_pr(" -j zone_%s_postrouting\n", zone
->name
);
354 else if (table
== FW3_TABLE_MANGLE
)
361 fw3_format_in_out(NULL
, dev
);
362 fw3_format_src_dest(NULL
, sub
);
363 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
364 fw3_format_limit(&zone
->log_limit
);
365 fw3_format_comment(zone
->name
, " (mtu_fix logging)");
366 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone
->name
);
370 fw3_format_in_out(NULL
, dev
);
371 fw3_format_src_dest(NULL
, sub
);
372 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
373 fw3_format_comment(zone
->name
, " (mtu_fix)");
374 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
377 else if (table
== FW3_TABLE_RAW
)
379 if (!zone
->conntrack
&& !disable_notrack
)
381 fw3_pr("-A notrack");
382 fw3_format_in_out(dev
, NULL
);
383 fw3_format_src_dest(sub
, NULL
);
384 fw3_format_extra(zone
->extra_src
);
385 fw3_format_comment(zone
->name
, " (notrack)");
386 fw3_pr(" -j CT --notrack\n", zone
->name
);
392 print_interface_rules(struct fw3_state
*state
, enum fw3_family family
,
393 enum fw3_table table
, bool reload
, struct fw3_zone
*zone
)
395 struct fw3_device
*dev
;
396 struct fw3_address
*sub
;
398 fw3_foreach(dev
, &zone
->devices
)
399 fw3_foreach(sub
, &zone
->subnets
)
401 if (!fw3_is_family(sub
, family
))
407 print_interface_rule(state
, family
, table
, reload
, zone
, dev
, sub
);
412 print_zone_rule(struct fw3_state
*state
, enum fw3_family family
,
413 enum fw3_table table
, bool reload
, struct fw3_zone
*zone
)
415 struct fw3_address
*msrc
;
416 struct fw3_address
*mdest
;
420 if (!fw3_is_family(zone
, family
))
425 case FW3_TABLE_FILTER
:
426 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
427 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_input
]);
429 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
430 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_forward
]);
432 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
433 zone
->name
, zone
->name
, fw3_flag_names
[zone
->policy_output
]);
437 for (t
= FW3_FLAG_REJECT
; t
<= FW3_FLAG_DROP
; t
++)
439 if (has(zone
->flags
, family
, fw3_to_src_target(t
)))
441 fw3_pr("-A zone_%s_src_%s", zone
->name
, fw3_flag_names
[t
]);
442 fw3_format_limit(&zone
->log_limit
);
443 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
444 fw3_flag_names
[t
], zone
->name
);
447 if (has(zone
->flags
, family
, t
))
449 fw3_pr("-A zone_%s_dest_%s", zone
->name
, fw3_flag_names
[t
]);
450 fw3_format_limit(&zone
->log_limit
);
451 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
452 fw3_flag_names
[t
], zone
->name
);
459 if (zone
->masq
&& family
== FW3_FAMILY_V4
)
461 fw3_foreach(msrc
, &zone
->masq_src
)
462 fw3_foreach(mdest
, &zone
->masq_dest
)
464 if (!fw3_is_family(msrc
, family
) ||
465 !fw3_is_family(mdest
, family
))
468 fw3_pr("-A zone_%s_postrouting", zone
->name
);
469 fw3_format_src_dest(msrc
, mdest
);
470 fw3_pr(" -j MASQUERADE\n");
476 case FW3_TABLE_MANGLE
:
480 print_interface_rules(state
, family
, table
, reload
, zone
);
484 fw3_print_zone_chains(struct fw3_state
*state
, enum fw3_family family
,
485 enum fw3_table table
, bool reload
)
487 struct fw3_zone
*zone
;
489 list_for_each_entry(zone
, &state
->zones
, list
)
490 print_zone_chain(state
, family
, table
, reload
, zone
);
494 fw3_print_zone_rules(struct fw3_state
*state
, enum fw3_family family
,
495 enum fw3_table table
, bool reload
)
497 struct fw3_zone
*zone
;
499 list_for_each_entry(zone
, &state
->zones
, list
)
500 print_zone_rule(state
, family
, table
, reload
, zone
);
504 fw3_flush_zones(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
507 struct fw3_zone
*z
, *tmp
;
508 const struct fw3_rule_spec
*c
;
511 list_for_each_entry_safe(z
, tmp
, &state
->zones
, list
)
513 if (!has(z
->flags
, handle
->family
, handle
->table
))
516 for (c
= zone_chains
; c
->format
; c
++)
518 /* don't touch user chains on selective stop */
519 if (reload
&& hasbit(c
->flag
, FW3_FLAG_CUSTOM_CHAINS
))
522 if (!fw3_is_family(c
, handle
->family
))
525 if (c
->table
!= handle
->table
)
528 snprintf(chain
, sizeof(chain
), c
->format
, z
->name
);
529 fw3_ipt_delete_rules(handle
, chain
);
530 fw3_ipt_delete_chain(handle
, chain
);
533 del(z
->flags
, handle
->family
, handle
->table
);
538 fw3_hotplug_zones(struct fw3_state
*state
, bool add
)
541 struct fw3_device
*d
;
543 list_for_each_entry(z
, &state
->zones
, list
)
545 if (add
!= hasbit(z
->flags
[0], FW3_FLAG_HOTPLUG
))
547 list_for_each_entry(d
, &z
->devices
, list
)
548 fw3_hotplug(add
, z
, d
);
551 setbit(z
->flags
[0], FW3_FLAG_HOTPLUG
);
553 delbit(z
->flags
[0], FW3_FLAG_HOTPLUG
);
559 fw3_lookup_zone(struct fw3_state
*state
, const char *name
)
563 if (list_empty(&state
->zones
))
566 list_for_each_entry(z
, &state
->zones
, list
)
568 if (strcmp(z
->name
, name
))
578 fw3_free_zone(struct fw3_zone
*zone
)
580 struct fw3_device
*dev
, *tmp
;
582 list_for_each_entry_safe(dev
, tmp
, &zone
->devices
, list
)
584 list_del(&dev
->list
);
588 list_for_each_entry_safe(dev
, tmp
, &zone
->networks
, list
)
590 list_del(&dev
->list
);
594 fw3_free_object(zone
, fw3_zone_opts
);