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_chain_spec zone_chains
[] = {
27 C(ANY
, FILTER
, UNSPEC
, "zone_%s_input"),
28 C(ANY
, FILTER
, UNSPEC
, "zone_%s_output"),
29 C(ANY
, FILTER
, UNSPEC
, "zone_%s_forward"),
31 C(ANY
, FILTER
, SRC_ACCEPT
, "zone_%s_src_ACCEPT"),
32 C(ANY
, FILTER
, SRC_REJECT
, "zone_%s_src_REJECT"),
33 C(ANY
, FILTER
, SRC_DROP
, "zone_%s_src_DROP"),
35 C(ANY
, FILTER
, ACCEPT
, "zone_%s_dest_ACCEPT"),
36 C(ANY
, FILTER
, REJECT
, "zone_%s_dest_REJECT"),
37 C(ANY
, FILTER
, DROP
, "zone_%s_dest_DROP"),
39 C(V4
, NAT
, SNAT
, "zone_%s_postrouting"),
40 C(V4
, NAT
, DNAT
, "zone_%s_prerouting"),
42 C(ANY
, RAW
, NOTRACK
, "zone_%s_notrack"),
44 C(ANY
, FILTER
, CUSTOM_CHAINS
, "input_%s_rule"),
45 C(ANY
, FILTER
, CUSTOM_CHAINS
, "output_%s_rule"),
46 C(ANY
, FILTER
, CUSTOM_CHAINS
, "forwarding_%s_rule"),
48 C(V4
, NAT
, CUSTOM_CHAINS
, "prerouting_%s_rule"),
49 C(V4
, NAT
, CUSTOM_CHAINS
, "postrouting_%s_rule"),
54 const struct fw3_option fw3_zone_opts
[] = {
55 FW3_OPT("enabled", bool, zone
, enabled
),
57 FW3_OPT("name", string
, zone
, name
),
58 FW3_OPT("family", family
, zone
, family
),
60 FW3_LIST("network", device
, zone
, networks
),
61 FW3_LIST("device", device
, zone
, devices
),
62 FW3_LIST("subnet", network
, zone
, subnets
),
64 FW3_OPT("input", target
, zone
, policy_input
),
65 FW3_OPT("forward", target
, zone
, policy_forward
),
66 FW3_OPT("output", target
, zone
, policy_output
),
68 FW3_OPT("masq", bool, zone
, masq
),
69 FW3_LIST("masq_src", network
, zone
, masq_src
),
70 FW3_LIST("masq_dest", network
, zone
, masq_dest
),
72 FW3_OPT("extra", string
, zone
, extra_src
),
73 FW3_OPT("extra_src", string
, zone
, extra_src
),
74 FW3_OPT("extra_dest", string
, zone
, extra_dest
),
76 FW3_OPT("conntrack", bool, zone
, conntrack
),
77 FW3_OPT("mtu_fix", bool, zone
, mtu_fix
),
78 FW3_OPT("custom_chains", bool, zone
, custom_chains
),
80 FW3_OPT("log", bool, zone
, log
),
81 FW3_OPT("log_limit", limit
, zone
, log_limit
),
83 FW3_OPT("__flags_v4", int, zone
, flags
[0]),
84 FW3_OPT("__flags_v6", int, zone
, flags
[1]),
91 check_policy(struct uci_element
*e
, enum fw3_flag
*pol
, enum fw3_flag def
,
94 if (*pol
== FW3_FLAG_UNSPEC
)
96 warn_elem(e
, "has no %s policy specified, using default", name
);
99 else if (*pol
> FW3_FLAG_DROP
)
101 warn_elem(e
, "has invalid %s policy, using default", name
);
107 resolve_networks(struct uci_element
*e
, struct fw3_zone
*zone
)
109 struct fw3_device
*net
, *tmp
;
111 list_for_each_entry(net
, &zone
->networks
, list
)
113 tmp
= fw3_ubus_device(net
->name
);
117 warn_elem(e
, "cannot resolve device of network '%s'", net
->name
);
121 snprintf(tmp
->network
, sizeof(tmp
->network
), "%s", net
->name
);
122 list_add_tail(&tmp
->list
, &zone
->devices
);
129 struct fw3_zone
*zone
;
131 zone
= calloc(1, sizeof(*zone
));
135 INIT_LIST_HEAD(&zone
->networks
);
136 INIT_LIST_HEAD(&zone
->devices
);
137 INIT_LIST_HEAD(&zone
->subnets
);
138 INIT_LIST_HEAD(&zone
->masq_src
);
139 INIT_LIST_HEAD(&zone
->masq_dest
);
141 zone
->enabled
= true;
142 zone
->custom_chains
= true;
143 zone
->log_limit
.rate
= 10;
149 fw3_load_zones(struct fw3_state
*state
, struct uci_package
*p
)
151 struct uci_section
*s
;
152 struct uci_element
*e
;
153 struct fw3_zone
*zone
;
154 struct fw3_defaults
*defs
= &state
->defaults
;
156 INIT_LIST_HEAD(&state
->zones
);
158 uci_foreach_element(&p
->sections
, e
)
160 s
= uci_to_section(e
);
162 if (strcmp(s
->type
, "zone"))
165 zone
= fw3_alloc_zone();
170 fw3_parse_options(zone
, fw3_zone_opts
, s
);
178 if (!zone
->extra_dest
)
179 zone
->extra_dest
= zone
->extra_src
;
181 if (!defs
->custom_chains
&& zone
->custom_chains
)
182 zone
->custom_chains
= false;
184 if (!zone
->name
|| !*zone
->name
)
186 warn_elem(e
, "has no name - ignoring");
191 if (strlen(zone
->name
) > FW3_ZONE_MAXNAMELEN
)
193 warn_elem(e
, "must not have a name longer than %u characters",
194 FW3_ZONE_MAXNAMELEN
);
199 fw3_ubus_zone_devices(zone
);
201 if (list_empty(&zone
->networks
) && list_empty(&zone
->devices
) &&
202 list_empty(&zone
->subnets
) && !zone
->extra_src
)
204 warn_elem(e
, "has no device, network, subnet or extra options");
207 check_policy(e
, &zone
->policy_input
, defs
->policy_input
, "input");
208 check_policy(e
, &zone
->policy_output
, defs
->policy_output
, "output");
209 check_policy(e
, &zone
->policy_forward
, defs
->policy_forward
, "forward");
211 resolve_networks(e
, zone
);
215 setbit(zone
->flags
[0], FW3_FLAG_SNAT
);
216 zone
->conntrack
= true;
219 if (zone
->custom_chains
)
221 setbit(zone
->flags
[0], FW3_FLAG_SNAT
);
222 setbit(zone
->flags
[0], FW3_FLAG_DNAT
);
225 setbit(zone
->flags
[0], fw3_to_src_target(zone
->policy_input
));
226 setbit(zone
->flags
[0], fw3_to_src_target(zone
->policy_forward
));
227 setbit(zone
->flags
[0], zone
->policy_output
);
229 setbit(zone
->flags
[1], fw3_to_src_target(zone
->policy_input
));
230 setbit(zone
->flags
[1], fw3_to_src_target(zone
->policy_forward
));
231 setbit(zone
->flags
[1], zone
->policy_output
);
233 list_add_tail(&zone
->list
, &state
->zones
);
239 print_zone_chain(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
240 bool reload
, struct fw3_zone
*zone
)
243 struct fw3_ipt_rule
*r
;
244 const struct fw3_chain_spec
*c
;
246 const char *flt_chains
[] = {
249 "forward", "forwarding",
252 const char *nat_chains
[] = {
253 "prerouting", "prerouting",
254 "postrouting", "postrouting",
257 if (!fw3_is_family(zone
, handle
->family
))
260 info(" * Zone '%s'", zone
->name
);
262 set(zone
->flags
, handle
->family
, handle
->table
);
264 if (zone
->custom_chains
)
265 set(zone
->flags
, handle
->family
, FW3_FLAG_CUSTOM_CHAINS
);
267 if (!zone
->conntrack
&& !state
->defaults
.drop_invalid
)
268 set(zone
->flags
, handle
->family
, FW3_FLAG_NOTRACK
);
270 for (c
= zone_chains
; c
->format
; c
++)
272 /* don't touch user chains on selective stop */
273 if (reload
&& c
->flag
== FW3_FLAG_CUSTOM_CHAINS
)
276 if (!fw3_is_family(c
, handle
->family
))
279 if (c
->table
!= handle
->table
)
283 !hasbit(zone
->flags
[handle
->family
== FW3_FAMILY_V6
], c
->flag
))
286 fw3_ipt_create_chain(handle
, c
->format
, zone
->name
);
289 if (zone
->custom_chains
)
291 if (handle
->table
== FW3_TABLE_FILTER
)
293 for (i
= 0; i
< sizeof(flt_chains
)/sizeof(flt_chains
[0]); i
+= 2)
295 r
= fw3_ipt_rule_new(handle
);
296 fw3_ipt_rule_comment(r
, "user chain for %s", flt_chains
[i
+1]);
297 fw3_ipt_rule_target(r
, "%s_%s_rule", flt_chains
[i
+1], zone
->name
);
298 fw3_ipt_rule_append(r
, "zone_%s_%s", zone
->name
, flt_chains
[i
]);
301 else if (handle
->table
== FW3_TABLE_NAT
)
303 for (i
= 0; i
< sizeof(nat_chains
)/sizeof(nat_chains
[0]); i
+= 2)
305 r
= fw3_ipt_rule_new(handle
);
306 fw3_ipt_rule_comment(r
, "user chain for %s", nat_chains
[i
+1]);
307 fw3_ipt_rule_target(r
, "%s_%s_rule", nat_chains
[i
+1], zone
->name
);
308 fw3_ipt_rule_append(r
, "zone_%s_%s", zone
->name
, nat_chains
[i
]);
313 set(zone
->flags
, handle
->family
, handle
->table
);
317 print_interface_rule(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
318 bool reload
, struct fw3_zone
*zone
,
319 struct fw3_device
*dev
, struct fw3_address
*sub
)
321 struct fw3_protocol tcp
= { .protocol
= 6 };
322 struct fw3_ipt_rule
*r
;
329 const char *chains
[] = {
335 #define jump_target(t) \
336 ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
338 if (handle
->table
== FW3_TABLE_FILTER
)
340 for (t
= FW3_FLAG_ACCEPT
; t
<= FW3_FLAG_DROP
; t
++)
342 if (has(zone
->flags
, handle
->family
, fw3_to_src_target(t
)))
344 r
= fw3_ipt_rule_create(handle
, NULL
, dev
, NULL
, sub
, NULL
);
345 fw3_ipt_rule_target(r
, jump_target(t
));
346 fw3_ipt_rule_extra(r
, zone
->extra_src
);
347 fw3_ipt_rule_replace(r
, "zone_%s_src_%s", zone
->name
,
351 if (has(zone
->flags
, handle
->family
, t
))
353 r
= fw3_ipt_rule_create(handle
, NULL
, NULL
, dev
, NULL
, sub
);
354 fw3_ipt_rule_target(r
, jump_target(t
));
355 fw3_ipt_rule_extra(r
, zone
->extra_dest
);
356 fw3_ipt_rule_replace(r
, "zone_%s_dest_%s", zone
->name
,
361 for (i
= 0; i
< sizeof(chains
)/sizeof(chains
[0]); i
++)
363 if (*chains
[i
] == 'o')
364 r
= fw3_ipt_rule_create(handle
, NULL
, NULL
, dev
, NULL
, sub
);
366 r
= fw3_ipt_rule_create(handle
, NULL
, dev
, NULL
, sub
, NULL
);
368 fw3_ipt_rule_target(r
, "zone_%s_%s", zone
->name
, chains
[i
]);
370 if (*chains
[i
] == 'o')
371 fw3_ipt_rule_extra(r
, zone
->extra_dest
);
373 fw3_ipt_rule_extra(r
, zone
->extra_src
);
375 fw3_ipt_rule_replace(r
, "delegate_%s", chains
[i
]);
378 else if (handle
->table
== FW3_TABLE_NAT
)
380 if (has(zone
->flags
, handle
->family
, FW3_FLAG_DNAT
))
382 r
= fw3_ipt_rule_create(handle
, NULL
, dev
, NULL
, sub
, NULL
);
383 fw3_ipt_rule_target(r
, "zone_%s_prerouting", zone
->name
);
384 fw3_ipt_rule_extra(r
, zone
->extra_src
);
385 fw3_ipt_rule_replace(r
, "delegate_prerouting");
388 if (has(zone
->flags
, handle
->family
, FW3_FLAG_SNAT
))
390 r
= fw3_ipt_rule_create(handle
, NULL
, NULL
, dev
, NULL
, sub
);
391 fw3_ipt_rule_target(r
, "zone_%s_postrouting", zone
->name
);
392 fw3_ipt_rule_extra(r
, zone
->extra_dest
);
393 fw3_ipt_rule_replace(r
, "delegate_postrouting");
396 else if (handle
->table
== FW3_TABLE_MANGLE
)
402 snprintf(buf
, sizeof(buf
) - 1, "MSSFIX(%s): ", zone
->name
);
404 r
= fw3_ipt_rule_create(handle
, &tcp
, NULL
, dev
, NULL
, sub
);
405 fw3_ipt_rule_addarg(r
, false, "--tcp-flags", "SYN,RST");
406 fw3_ipt_rule_addarg(r
, false, "SYN", NULL
);
407 fw3_ipt_rule_limit(r
, &zone
->log_limit
);
408 fw3_ipt_rule_comment(r
, "%s (mtu_fix logging)", zone
->name
);
409 fw3_ipt_rule_target(r
, "LOG");
410 fw3_ipt_rule_addarg(r
, false, "--log-prefix", buf
);
411 fw3_ipt_rule_replace(r
, "mssfix");
414 r
= fw3_ipt_rule_create(handle
, &tcp
, NULL
, dev
, NULL
, sub
);
415 fw3_ipt_rule_addarg(r
, false, "--tcp-flags", "SYN,RST");
416 fw3_ipt_rule_addarg(r
, false, "SYN", NULL
);
417 fw3_ipt_rule_comment(r
, "%s (mtu_fix)", zone
->name
);
418 fw3_ipt_rule_target(r
, "TCPMSS");
419 fw3_ipt_rule_addarg(r
, false, "--clamp-mss-to-pmtu", NULL
);
420 fw3_ipt_rule_replace(r
, "mssfix");
423 else if (handle
->table
== FW3_TABLE_RAW
)
425 if (has(zone
->flags
, handle
->family
, FW3_FLAG_NOTRACK
))
427 r
= fw3_ipt_rule_create(handle
, NULL
, dev
, NULL
, sub
, NULL
);
428 fw3_ipt_rule_target(r
, "zone_%s_notrack", zone
->name
);
429 fw3_ipt_rule_extra(r
, zone
->extra_src
);
430 fw3_ipt_rule_replace(r
, "delegate_notrack");
436 print_interface_rules(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
437 bool reload
, struct fw3_zone
*zone
)
439 struct fw3_device
*dev
;
440 struct fw3_address
*sub
;
442 fw3_foreach(dev
, &zone
->devices
)
443 fw3_foreach(sub
, &zone
->subnets
)
445 if (!fw3_is_family(sub
, handle
->family
))
451 print_interface_rule(handle
, state
, reload
, zone
, dev
, sub
);
456 print_zone_rule(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
457 bool reload
, struct fw3_zone
*zone
)
459 bool disable_notrack
= state
->defaults
.drop_invalid
;
460 struct fw3_address
*msrc
;
461 struct fw3_address
*mdest
;
462 struct fw3_ipt_rule
*r
;
467 if (!fw3_is_family(zone
, handle
->family
))
470 switch (handle
->table
)
472 case FW3_TABLE_FILTER
:
473 if (has(zone
->flags
, handle
->family
, FW3_FLAG_DNAT
))
475 r
= fw3_ipt_rule_new(handle
);
476 fw3_ipt_rule_extra(r
, "-m conntrack --ctstate DNAT");
477 fw3_ipt_rule_comment(r
, "Accept port redirections");
478 fw3_ipt_rule_target(r
, fw3_flag_names
[FW3_FLAG_ACCEPT
]);
479 fw3_ipt_rule_append(r
, "zone_%s_input", zone
->name
);
481 r
= fw3_ipt_rule_new(handle
);
482 fw3_ipt_rule_extra(r
, "-m conntrack --ctstate DNAT");
483 fw3_ipt_rule_comment(r
, "Accept port forwards");
484 fw3_ipt_rule_target(r
, fw3_flag_names
[FW3_FLAG_ACCEPT
]);
485 fw3_ipt_rule_append(r
, "zone_%s_forward", zone
->name
);
488 r
= fw3_ipt_rule_new(handle
);
489 fw3_ipt_rule_target(r
, "zone_%s_src_%s", zone
->name
,
490 fw3_flag_names
[zone
->policy_input
]);
491 fw3_ipt_rule_append(r
, "zone_%s_input", zone
->name
);
493 r
= fw3_ipt_rule_new(handle
);
494 fw3_ipt_rule_target(r
, "zone_%s_src_%s", zone
->name
,
495 fw3_flag_names
[zone
->policy_forward
]);
496 fw3_ipt_rule_append(r
, "zone_%s_forward", zone
->name
);
498 r
= fw3_ipt_rule_new(handle
);
499 fw3_ipt_rule_target(r
, "zone_%s_dest_%s", zone
->name
,
500 fw3_flag_names
[zone
->policy_output
]);
501 fw3_ipt_rule_append(r
, "zone_%s_output", zone
->name
);
505 for (t
= FW3_FLAG_REJECT
; t
<= FW3_FLAG_DROP
; t
++)
507 if (has(zone
->flags
, handle
->family
, fw3_to_src_target(t
)))
509 r
= fw3_ipt_rule_new(handle
);
511 snprintf(buf
, sizeof(buf
) - 1, "%s(src %s)",
512 fw3_flag_names
[t
], zone
->name
);
514 fw3_ipt_rule_limit(r
, &zone
->log_limit
);
515 fw3_ipt_rule_target(r
, "LOG");
516 fw3_ipt_rule_addarg(r
, false, "--log-prefix", buf
);
517 fw3_ipt_rule_append(r
, "zone_%s_src_%s",
518 zone
->name
, fw3_flag_names
[t
]);
521 if (has(zone
->flags
, handle
->family
, t
))
523 r
= fw3_ipt_rule_new(handle
);
525 snprintf(buf
, sizeof(buf
) - 1, "%s(dest %s)",
526 fw3_flag_names
[t
], zone
->name
);
528 fw3_ipt_rule_limit(r
, &zone
->log_limit
);
529 fw3_ipt_rule_target(r
, "LOG");
530 fw3_ipt_rule_addarg(r
, false, "--log-prefix", buf
);
531 fw3_ipt_rule_append(r
, "zone_%s_dest_%s",
532 zone
->name
, fw3_flag_names
[t
]);
539 if (zone
->masq
&& handle
->family
== FW3_FAMILY_V4
)
541 fw3_foreach(msrc
, &zone
->masq_src
)
542 fw3_foreach(mdest
, &zone
->masq_dest
)
544 if (!fw3_is_family(msrc
, handle
->family
) ||
545 !fw3_is_family(mdest
, handle
->family
))
548 r
= fw3_ipt_rule_new(handle
);
549 fw3_ipt_rule_src_dest(r
, msrc
, mdest
);
550 fw3_ipt_rule_target(r
, "MASQUERADE");
551 fw3_ipt_rule_append(r
, "zone_%s_postrouting", zone
->name
);
557 if (!zone
->conntrack
&& !disable_notrack
)
559 r
= fw3_ipt_rule_new(handle
);
560 fw3_ipt_rule_target(r
, "CT");
561 fw3_ipt_rule_addarg(r
, false, "--notrack", NULL
);
562 fw3_ipt_rule_append(r
, "zone_%s_notrack", zone
->name
);
566 case FW3_TABLE_MANGLE
:
570 print_interface_rules(handle
, state
, reload
, zone
);
574 fw3_print_zone_chains(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
577 struct fw3_zone
*zone
;
579 list_for_each_entry(zone
, &state
->zones
, list
)
580 print_zone_chain(handle
, state
, reload
, zone
);
584 fw3_print_zone_rules(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
587 struct fw3_zone
*zone
;
589 list_for_each_entry(zone
, &state
->zones
, list
)
590 print_zone_rule(handle
, state
, reload
, zone
);
594 fw3_flush_zones(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
597 struct fw3_zone
*z
, *tmp
;
598 const struct fw3_chain_spec
*c
;
601 list_for_each_entry_safe(z
, tmp
, &state
->zones
, list
)
603 if (!has(z
->flags
, handle
->family
, handle
->table
))
606 for (c
= zone_chains
; c
->format
; c
++)
608 /* don't touch user chains on selective stop */
609 if (reload
&& c
->flag
== FW3_FLAG_CUSTOM_CHAINS
)
612 if (!fw3_is_family(c
, handle
->family
))
615 if (c
->table
!= handle
->table
)
618 if (c
->flag
&& !has(z
->flags
, handle
->family
, c
->flag
))
621 snprintf(chain
, sizeof(chain
), c
->format
, z
->name
);
622 fw3_ipt_flush_chain(handle
, chain
);
624 /* keep certain basic chains that do not depend on any settings to
625 avoid purging unrelated user rules pointing to them */
626 if (reload
&& !c
->flag
)
629 fw3_ipt_delete_chain(handle
, chain
);
632 del(z
->flags
, handle
->family
, handle
->table
);
637 fw3_hotplug_zones(struct fw3_state
*state
, bool add
)
640 struct fw3_device
*d
;
642 list_for_each_entry(z
, &state
->zones
, list
)
644 if (add
!= hasbit(z
->flags
[0], FW3_FLAG_HOTPLUG
))
646 list_for_each_entry(d
, &z
->devices
, list
)
647 fw3_hotplug(add
, z
, d
);
650 setbit(z
->flags
[0], FW3_FLAG_HOTPLUG
);
652 delbit(z
->flags
[0], FW3_FLAG_HOTPLUG
);
658 fw3_lookup_zone(struct fw3_state
*state
, const char *name
)
662 if (list_empty(&state
->zones
))
665 list_for_each_entry(z
, &state
->zones
, list
)
667 if (strcmp(z
->name
, name
))
677 fw3_resolve_zone_addresses(struct fw3_zone
*zone
)
679 struct fw3_device
*net
;
680 struct fw3_address
*addr
, *tmp
;
681 struct list_head
*all
;
683 all
= calloc(1, sizeof(*all
));
689 list_for_each_entry(net
, &zone
->networks
, list
)
690 fw3_ubus_address(all
, net
->name
);
692 list_for_each_entry(addr
, &zone
->subnets
, list
)
694 tmp
= malloc(sizeof(*tmp
));
699 memcpy(tmp
, addr
, sizeof(*tmp
));
700 list_add_tail(&tmp
->list
, all
);