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
, FILTER
, CUSTOM_CHAINS
, "input_%s_rule"),
43 C(ANY
, FILTER
, CUSTOM_CHAINS
, "output_%s_rule"),
44 C(ANY
, FILTER
, CUSTOM_CHAINS
, "forwarding_%s_rule"),
46 C(V4
, NAT
, CUSTOM_CHAINS
, "prerouting_%s_rule"),
47 C(V4
, NAT
, CUSTOM_CHAINS
, "postrouting_%s_rule"),
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", network
, 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", network
, zone
, masq_src
),
68 FW3_LIST("masq_dest", network
, 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
),
81 FW3_OPT("__flags_v4", int, zone
, flags
[0]),
82 FW3_OPT("__flags_v6", int, zone
, flags
[1]),
89 check_policy(struct uci_element
*e
, enum fw3_flag
*pol
, enum fw3_flag def
,
92 if (*pol
== FW3_FLAG_UNSPEC
)
94 warn_elem(e
, "has no %s policy specified, using default", name
);
97 else if (*pol
> FW3_FLAG_DROP
)
99 warn_elem(e
, "has invalid %s policy, using default", name
);
105 resolve_networks(struct uci_element
*e
, struct fw3_zone
*zone
)
107 struct fw3_device
*net
, *tmp
;
109 list_for_each_entry(net
, &zone
->networks
, list
)
111 tmp
= fw3_ubus_device(net
->name
);
115 warn_elem(e
, "cannot resolve device of network '%s'", net
->name
);
119 snprintf(tmp
->network
, sizeof(tmp
->network
), "%s", net
->name
);
120 list_add_tail(&tmp
->list
, &zone
->devices
);
127 struct fw3_zone
*zone
;
129 zone
= malloc(sizeof(*zone
));
134 memset(zone
, 0, sizeof(*zone
));
136 INIT_LIST_HEAD(&zone
->networks
);
137 INIT_LIST_HEAD(&zone
->devices
);
138 INIT_LIST_HEAD(&zone
->subnets
);
139 INIT_LIST_HEAD(&zone
->masq_src
);
140 INIT_LIST_HEAD(&zone
->masq_dest
);
142 zone
->enabled
= true;
143 zone
->custom_chains
= true;
144 zone
->log_limit
.rate
= 10;
150 fw3_load_zones(struct fw3_state
*state
, struct uci_package
*p
)
152 struct uci_section
*s
;
153 struct uci_element
*e
;
154 struct fw3_zone
*zone
;
155 struct fw3_defaults
*defs
= &state
->defaults
;
157 INIT_LIST_HEAD(&state
->zones
);
159 uci_foreach_element(&p
->sections
, e
)
161 s
= uci_to_section(e
);
163 if (strcmp(s
->type
, "zone"))
166 zone
= fw3_alloc_zone();
171 fw3_parse_options(zone
, fw3_zone_opts
, s
);
179 if (!zone
->extra_dest
)
180 zone
->extra_dest
= zone
->extra_src
;
182 if (!defs
->custom_chains
&& zone
->custom_chains
)
183 zone
->custom_chains
= false;
185 if (!zone
->name
|| !*zone
->name
)
187 warn_elem(e
, "has no name - ignoring");
192 if (list_empty(&zone
->networks
) && list_empty(&zone
->devices
) &&
193 list_empty(&zone
->subnets
) && !zone
->extra_src
)
195 warn_elem(e
, "has no device, network, subnet or extra options");
198 check_policy(e
, &zone
->policy_input
, defs
->policy_input
, "input");
199 check_policy(e
, &zone
->policy_output
, defs
->policy_output
, "output");
200 check_policy(e
, &zone
->policy_forward
, defs
->policy_forward
, "forward");
202 resolve_networks(e
, zone
);
206 setbit(zone
->flags
[0], FW3_FLAG_SNAT
);
207 zone
->conntrack
= true;
210 if (zone
->custom_chains
)
212 setbit(zone
->flags
[0], FW3_FLAG_SNAT
);
213 setbit(zone
->flags
[0], FW3_FLAG_DNAT
);
216 setbit(zone
->flags
[0], fw3_to_src_target(zone
->policy_input
));
217 setbit(zone
->flags
[0], zone
->policy_output
);
218 setbit(zone
->flags
[0], zone
->policy_forward
);
220 setbit(zone
->flags
[1], fw3_to_src_target(zone
->policy_input
));
221 setbit(zone
->flags
[1], zone
->policy_output
);
222 setbit(zone
->flags
[1], zone
->policy_forward
);
224 list_add_tail(&zone
->list
, &state
->zones
);
230 print_zone_chain(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
231 bool reload
, struct fw3_zone
*zone
)
234 struct fw3_ipt_rule
*r
;
235 const struct fw3_chain_spec
*c
;
237 const char *flt_chains
[] = {
240 "forward", "forwarding",
243 const char *nat_chains
[] = {
244 "prerouting", "prerouting",
245 "postrouting", "postrouting",
248 if (!fw3_is_family(zone
, handle
->family
))
251 info(" * Zone '%s'", zone
->name
);
253 set(zone
->flags
, handle
->family
, handle
->table
);
255 if (zone
->custom_chains
)
256 set(zone
->flags
, handle
->family
, FW3_FLAG_CUSTOM_CHAINS
);
258 if (!zone
->conntrack
&& !state
->defaults
.drop_invalid
)
259 set(zone
->flags
, handle
->family
, FW3_FLAG_NOTRACK
);
261 for (c
= zone_chains
; c
->format
; c
++)
263 /* don't touch user chains on selective stop */
264 if (reload
&& c
->flag
== FW3_FLAG_CUSTOM_CHAINS
)
267 if (!fw3_is_family(c
, handle
->family
))
270 if (c
->table
!= handle
->table
)
274 !hasbit(zone
->flags
[handle
->family
== FW3_FAMILY_V6
], c
->flag
))
277 fw3_ipt_create_chain(handle
, c
->format
, zone
->name
);
280 if (zone
->custom_chains
)
282 if (handle
->table
== FW3_TABLE_FILTER
)
284 for (i
= 0; i
< sizeof(flt_chains
)/sizeof(flt_chains
[0]); i
+= 2)
286 r
= fw3_ipt_rule_new(handle
);
287 fw3_ipt_rule_comment(r
, "user chain for %s", flt_chains
[i
+1]);
288 fw3_ipt_rule_target(r
, "%s_%s_rule", flt_chains
[i
+1], zone
->name
);
289 fw3_ipt_rule_append(r
, "zone_%s_%s", zone
->name
, flt_chains
[i
]);
292 else if (handle
->table
== FW3_TABLE_NAT
)
294 for (i
= 0; i
< sizeof(nat_chains
)/sizeof(nat_chains
[0]); i
+= 2)
296 r
= fw3_ipt_rule_new(handle
);
297 fw3_ipt_rule_comment(r
, "user chain for %s", nat_chains
[i
+1]);
298 fw3_ipt_rule_target(r
, "%s_%s_rule", nat_chains
[i
+1], zone
->name
);
299 fw3_ipt_rule_append(r
, "zone_%s_%s", zone
->name
, nat_chains
[i
]);
304 set(zone
->flags
, handle
->family
, handle
->table
);
308 print_interface_rule(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
309 bool reload
, struct fw3_zone
*zone
,
310 struct fw3_device
*dev
, struct fw3_address
*sub
)
312 bool disable_notrack
= state
->defaults
.drop_invalid
;
313 struct fw3_protocol tcp
= { .protocol
= 6 };
314 struct fw3_ipt_rule
*r
;
321 const char *chains
[] = {
327 #define jump_target(t) \
328 ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
330 if (handle
->table
== FW3_TABLE_FILTER
)
332 for (t
= FW3_FLAG_ACCEPT
; t
<= FW3_FLAG_DROP
; t
++)
334 if (has(zone
->flags
, handle
->family
, fw3_to_src_target(t
)))
336 r
= fw3_ipt_rule_create(handle
, NULL
, dev
, NULL
, sub
, NULL
);
337 fw3_ipt_rule_target(r
, jump_target(t
));
338 fw3_ipt_rule_extra(r
, zone
->extra_src
);
339 fw3_ipt_rule_append(r
, "zone_%s_src_%s", zone
->name
,
343 if (has(zone
->flags
, handle
->family
, t
))
345 r
= fw3_ipt_rule_create(handle
, NULL
, NULL
, dev
, NULL
, sub
);
346 fw3_ipt_rule_target(r
, jump_target(t
));
347 fw3_ipt_rule_extra(r
, zone
->extra_dest
);
348 fw3_ipt_rule_append(r
, "zone_%s_dest_%s", zone
->name
,
353 for (i
= 0; i
< sizeof(chains
)/sizeof(chains
[0]); i
++)
355 if (*chains
[i
] == 'o')
356 r
= fw3_ipt_rule_create(handle
, NULL
, NULL
, dev
, NULL
, sub
);
358 r
= fw3_ipt_rule_create(handle
, NULL
, dev
, NULL
, sub
, NULL
);
360 fw3_ipt_rule_target(r
, "zone_%s_%s", zone
->name
, chains
[i
]);
362 if (*chains
[i
] == 'o')
363 fw3_ipt_rule_extra(r
, zone
->extra_dest
);
365 fw3_ipt_rule_extra(r
, zone
->extra_src
);
367 fw3_ipt_rule_append(r
, "delegate_%s", chains
[i
]);
370 else if (handle
->table
== FW3_TABLE_NAT
)
372 if (has(zone
->flags
, handle
->family
, FW3_FLAG_DNAT
))
374 r
= fw3_ipt_rule_create(handle
, NULL
, dev
, NULL
, sub
, NULL
);
375 fw3_ipt_rule_target(r
, "zone_%s_prerouting", zone
->name
);
376 fw3_ipt_rule_extra(r
, zone
->extra_src
);
377 fw3_ipt_rule_append(r
, "delegate_prerouting");
380 if (has(zone
->flags
, handle
->family
, FW3_FLAG_SNAT
))
382 r
= fw3_ipt_rule_create(handle
, NULL
, NULL
, dev
, NULL
, sub
);
383 fw3_ipt_rule_target(r
, "zone_%s_postrouting", zone
->name
);
384 fw3_ipt_rule_extra(r
, zone
->extra_dest
);
385 fw3_ipt_rule_append(r
, "delegate_postrouting");
388 else if (handle
->table
== FW3_TABLE_MANGLE
)
394 snprintf(buf
, sizeof(buf
) - 1, "MSSFIX(%s): ", zone
->name
);
396 r
= fw3_ipt_rule_create(handle
, &tcp
, NULL
, dev
, NULL
, sub
);
397 fw3_ipt_rule_addarg(r
, false, "--tcp-flags", "SYN,RST");
398 fw3_ipt_rule_addarg(r
, false, "SYN", NULL
);
399 fw3_ipt_rule_limit(r
, &zone
->log_limit
);
400 fw3_ipt_rule_comment(r
, "%s (mtu_fix logging)", zone
->name
);
401 fw3_ipt_rule_target(r
, "LOG");
402 fw3_ipt_rule_addarg(r
, false, "--log-prefix", buf
);
403 fw3_ipt_rule_append(r
, "mssfix");
406 r
= fw3_ipt_rule_create(handle
, &tcp
, NULL
, dev
, NULL
, sub
);
407 fw3_ipt_rule_addarg(r
, false, "--tcp-flags", "SYN,RST");
408 fw3_ipt_rule_addarg(r
, false, "SYN", NULL
);
409 fw3_ipt_rule_comment(r
, "%s (mtu_fix)", zone
->name
);
410 fw3_ipt_rule_target(r
, "TCPMSS");
411 fw3_ipt_rule_addarg(r
, false, "--clamp-mss-to-pmtu", NULL
);
412 fw3_ipt_rule_append(r
, "mssfix");
415 else if (handle
->table
== FW3_TABLE_RAW
)
417 if (!zone
->conntrack
&& !disable_notrack
)
419 r
= fw3_ipt_rule_create(handle
, NULL
, dev
, NULL
, sub
, NULL
);
420 fw3_ipt_rule_target(r
, "CT");
421 fw3_ipt_rule_addarg(r
, false, "--notrack", NULL
);
422 fw3_ipt_rule_extra(r
, zone
->extra_src
);
423 fw3_ipt_rule_append(r
, "notrack");
429 print_interface_rules(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
430 bool reload
, struct fw3_zone
*zone
)
432 struct fw3_device
*dev
;
433 struct fw3_address
*sub
;
435 fw3_foreach(dev
, &zone
->devices
)
436 fw3_foreach(sub
, &zone
->subnets
)
438 if (!fw3_is_family(sub
, handle
->family
))
444 print_interface_rule(handle
, state
, reload
, zone
, dev
, sub
);
449 print_zone_rule(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
450 bool reload
, struct fw3_zone
*zone
)
452 struct fw3_address
*msrc
;
453 struct fw3_address
*mdest
;
454 struct fw3_ipt_rule
*r
;
459 if (!fw3_is_family(zone
, handle
->family
))
462 switch (handle
->table
)
464 case FW3_TABLE_FILTER
:
465 r
= fw3_ipt_rule_new(handle
);
466 fw3_ipt_rule_target(r
, "zone_%s_src_%s", zone
->name
,
467 fw3_flag_names
[zone
->policy_input
]);
468 fw3_ipt_rule_append(r
, "zone_%s_input", zone
->name
);
470 r
= fw3_ipt_rule_new(handle
);
471 fw3_ipt_rule_target(r
, "zone_%s_dest_%s", zone
->name
,
472 fw3_flag_names
[zone
->policy_forward
]);
473 fw3_ipt_rule_append(r
, "zone_%s_forward", zone
->name
);
475 r
= fw3_ipt_rule_new(handle
);
476 fw3_ipt_rule_target(r
, "zone_%s_dest_%s", zone
->name
,
477 fw3_flag_names
[zone
->policy_output
]);
478 fw3_ipt_rule_append(r
, "zone_%s_output", zone
->name
);
482 for (t
= FW3_FLAG_REJECT
; t
<= FW3_FLAG_DROP
; t
++)
484 if (has(zone
->flags
, handle
->family
, fw3_to_src_target(t
)))
486 r
= fw3_ipt_rule_new(handle
);
488 snprintf(buf
, sizeof(buf
) - 1, "%s(src %s)",
489 fw3_flag_names
[t
], zone
->name
);
491 fw3_ipt_rule_limit(r
, &zone
->log_limit
);
492 fw3_ipt_rule_target(r
, "LOG");
493 fw3_ipt_rule_addarg(r
, false, "--log-prefix", buf
);
494 fw3_ipt_rule_append(r
, "zone_%s_src_%s",
495 zone
->name
, fw3_flag_names
[t
]);
498 if (has(zone
->flags
, handle
->family
, t
))
500 r
= fw3_ipt_rule_new(handle
);
502 snprintf(buf
, sizeof(buf
) - 1, "%s(dest %s)",
503 fw3_flag_names
[t
], zone
->name
);
505 fw3_ipt_rule_limit(r
, &zone
->log_limit
);
506 fw3_ipt_rule_target(r
, "LOG");
507 fw3_ipt_rule_addarg(r
, false, "--log-prefix", buf
);
508 fw3_ipt_rule_append(r
, "zone_%s_dest_%s",
509 zone
->name
, fw3_flag_names
[t
]);
516 if (zone
->masq
&& handle
->family
== FW3_FAMILY_V4
)
518 fw3_foreach(msrc
, &zone
->masq_src
)
519 fw3_foreach(mdest
, &zone
->masq_dest
)
521 if (!fw3_is_family(msrc
, handle
->family
) ||
522 !fw3_is_family(mdest
, handle
->family
))
525 r
= fw3_ipt_rule_new(handle
);
526 fw3_ipt_rule_src_dest(r
, msrc
, mdest
);
527 fw3_ipt_rule_target(r
, "MASQUERADE");
528 fw3_ipt_rule_append(r
, "zone_%s_postrouting", zone
->name
);
534 case FW3_TABLE_MANGLE
:
538 print_interface_rules(handle
, state
, reload
, zone
);
542 fw3_print_zone_chains(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
545 struct fw3_zone
*zone
;
547 list_for_each_entry(zone
, &state
->zones
, list
)
548 print_zone_chain(handle
, state
, reload
, zone
);
552 fw3_print_zone_rules(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
555 struct fw3_zone
*zone
;
557 list_for_each_entry(zone
, &state
->zones
, list
)
558 print_zone_rule(handle
, state
, reload
, zone
);
562 fw3_flush_zones(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
565 struct fw3_zone
*z
, *tmp
;
566 const struct fw3_chain_spec
*c
;
569 list_for_each_entry_safe(z
, tmp
, &state
->zones
, list
)
571 if (!has(z
->flags
, handle
->family
, handle
->table
))
574 for (c
= zone_chains
; c
->format
; c
++)
576 /* don't touch user chains on selective stop */
577 if (reload
&& hasbit(c
->flag
, FW3_FLAG_CUSTOM_CHAINS
))
580 if (!fw3_is_family(c
, handle
->family
))
583 if (c
->table
!= handle
->table
)
586 snprintf(chain
, sizeof(chain
), c
->format
, z
->name
);
587 fw3_ipt_delete_rules(handle
, chain
);
588 fw3_ipt_delete_chain(handle
, chain
);
591 del(z
->flags
, handle
->family
, handle
->table
);
596 fw3_hotplug_zones(struct fw3_state
*state
, bool add
)
599 struct fw3_device
*d
;
601 list_for_each_entry(z
, &state
->zones
, list
)
603 if (add
!= hasbit(z
->flags
[0], FW3_FLAG_HOTPLUG
))
605 list_for_each_entry(d
, &z
->devices
, list
)
606 fw3_hotplug(add
, z
, d
);
609 setbit(z
->flags
[0], FW3_FLAG_HOTPLUG
);
611 delbit(z
->flags
[0], FW3_FLAG_HOTPLUG
);
617 fw3_lookup_zone(struct fw3_state
*state
, const char *name
)
621 if (list_empty(&state
->zones
))
624 list_for_each_entry(z
, &state
->zones
, list
)
626 if (strcmp(z
->name
, name
))
636 fw3_free_zone(struct fw3_zone
*zone
)
638 struct fw3_device
*dev
, *tmp
;
640 list_for_each_entry_safe(dev
, tmp
, &zone
->devices
, list
)
642 list_del(&dev
->list
);
646 list_for_each_entry_safe(dev
, tmp
, &zone
->networks
, list
)
648 list_del(&dev
->list
);
652 fw3_free_object(zone
, fw3_zone_opts
);