2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2013-2014 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.
19 #include "redirects.h"
22 const struct fw3_option fw3_redirect_opts
[] = {
23 FW3_OPT("enabled", bool, redirect
, enabled
),
25 FW3_OPT("name", string
, redirect
, name
),
26 FW3_OPT("family", family
, redirect
, family
),
28 FW3_OPT("src", device
, redirect
, src
),
29 FW3_OPT("dest", device
, redirect
, dest
),
31 FW3_OPT("ipset", setmatch
, redirect
, ipset
),
33 FW3_LIST("proto", protocol
, redirect
, proto
),
35 FW3_OPT("src_ip", network
, redirect
, ip_src
),
36 FW3_LIST("src_mac", mac
, redirect
, mac_src
),
37 FW3_OPT("src_port", port
, redirect
, port_src
),
39 FW3_OPT("src_dip", network
, redirect
, ip_dest
),
40 FW3_OPT("src_dport", port
, redirect
, port_dest
),
42 FW3_OPT("dest_ip", network
, redirect
, ip_redir
),
43 FW3_OPT("dest_port", port
, redirect
, port_redir
),
45 FW3_OPT("extra", string
, redirect
, extra
),
47 FW3_OPT("limit", limit
, redirect
, limit
),
48 FW3_OPT("limit_burst", int, redirect
, limit
.burst
),
50 FW3_OPT("utc_time", bool, redirect
, time
.utc
),
51 FW3_OPT("start_date", date
, redirect
, time
.datestart
),
52 FW3_OPT("stop_date", date
, redirect
, time
.datestop
),
53 FW3_OPT("start_time", time
, redirect
, time
.timestart
),
54 FW3_OPT("stop_time", time
, redirect
, time
.timestop
),
55 FW3_OPT("weekdays", weekdays
, redirect
, time
.weekdays
),
56 FW3_OPT("monthdays", monthdays
, redirect
, time
.monthdays
),
58 FW3_OPT("mark", mark
, redirect
, mark
),
60 FW3_OPT("reflection", bool, redirect
, reflection
),
61 FW3_OPT("reflection_src", reflection_source
,
62 redirect
, reflection_src
),
64 FW3_OPT("target", target
, redirect
, target
),
71 check_families(struct uci_element
*e
, struct fw3_redirect
*r
)
73 if (r
->family
== FW3_FAMILY_ANY
)
76 if (r
->_src
&& r
->_src
->family
&& r
->_src
->family
!= r
->family
)
78 warn_elem(e
, "refers to source zone with different family");
82 if (r
->_dest
&& r
->_dest
->family
&& r
->_dest
->family
!= r
->family
)
84 warn_elem(e
, "refers to destination zone with different family");
88 if (r
->ipset
.ptr
&& r
->ipset
.ptr
->family
&&
89 r
->ipset
.ptr
->family
!= r
->family
)
91 warn_elem(e
, "refers to ipset with different family");
95 if (r
->ip_src
.family
&& r
->ip_src
.family
!= r
->family
)
97 warn_elem(e
, "uses source ip with different family");
101 if (r
->ip_dest
.family
&& r
->ip_dest
.family
!= r
->family
)
103 warn_elem(e
, "uses destination ip with different family");
107 if (r
->ip_redir
.family
&& r
->ip_redir
.family
!= r
->family
)
109 warn_elem(e
, "uses redirect ip with different family");
117 compare_addr(struct fw3_address
*a
, struct fw3_address
*b
)
121 if (a
->family
!= FW3_FAMILY_V4
|| b
->family
!= FW3_FAMILY_V4
)
124 mask
= htonl(~((1 << (32 - a
->mask
)) - 1));
126 return ((a
->address
.v4
.s_addr
& mask
) == (b
->address
.v4
.s_addr
& mask
));
130 resolve_dest(struct uci_element
*e
, struct fw3_redirect
*redir
,
131 struct fw3_state
*state
)
133 struct fw3_zone
*zone
;
134 struct fw3_address
*addr
;
135 struct list_head
*addrs
;
137 if (!redir
->ip_redir
.set
)
140 list_for_each_entry(zone
, &state
->zones
, list
)
142 addrs
= fw3_resolve_zone_addresses(zone
);
147 list_for_each_entry(addr
, addrs
, list
)
149 if (!compare_addr(addr
, &redir
->ip_redir
))
152 strncpy(redir
->dest
.name
, zone
->name
, sizeof(redir
->dest
.name
));
153 redir
->dest
.set
= true;
159 fw3_free_list(addrs
);
169 check_local(struct uci_element
*e
, struct fw3_redirect
*redir
,
170 struct fw3_state
*state
)
172 struct fw3_zone
*zone
;
173 struct fw3_device
*net
;
174 struct fw3_address
*addr
, *tmp
;
176 if (redir
->target
!= FW3_FLAG_DNAT
)
179 if (!redir
->ip_redir
.set
)
185 list_for_each_entry(zone
, &state
->zones
, list
)
187 list_for_each_entry(net
, &zone
->networks
, list
)
191 fw3_ubus_address(&addrs
, net
->name
);
192 list_for_each_entry_safe(addr
, tmp
, &addrs
, list
)
194 if (compare_addr(&redir
->ip_redir
, addr
)) {
195 warn_elem(e
, "refers to a destination address on this router, "
196 "assuming port redirection");
202 list_del(&addr
->list
);
215 fw3_load_redirects(struct fw3_state
*state
, struct uci_package
*p
)
217 struct uci_section
*s
;
218 struct uci_element
*e
;
219 struct fw3_redirect
*redir
;
223 INIT_LIST_HEAD(&state
->redirects
);
225 uci_foreach_element(&p
->sections
, e
)
227 s
= uci_to_section(e
);
229 if (strcmp(s
->type
, "redirect"))
232 redir
= calloc(1, sizeof(*redir
));
236 INIT_LIST_HEAD(&redir
->proto
);
237 INIT_LIST_HEAD(&redir
->mac_src
);
239 redir
->enabled
= true;
240 redir
->reflection
= true;
244 if (!fw3_parse_options(redir
, fw3_redirect_opts
, s
))
246 warn_elem(e
, "skipped due to invalid options");
247 fw3_free_redirect(redir
);
253 fw3_free_redirect(redir
);
257 if (redir
->src
.invert
)
259 warn_elem(e
, "must not have an inverted source");
260 fw3_free_redirect(redir
);
263 else if (redir
->src
.set
&& !redir
->src
.any
&&
264 !(redir
->_src
= fw3_lookup_zone(state
, redir
->src
.name
)))
266 warn_elem(e
, "refers to not existing zone '%s'", redir
->src
.name
);
267 fw3_free_redirect(redir
);
270 else if (redir
->dest
.set
&& !redir
->dest
.any
&&
271 !(redir
->_dest
= fw3_lookup_zone(state
, redir
->dest
.name
)))
273 warn_elem(e
, "refers to not existing zone '%s'", redir
->dest
.name
);
274 fw3_free_redirect(redir
);
277 else if (redir
->ipset
.set
&& state
->disable_ipsets
)
279 warn_elem(e
, "skipped due to disabled ipset support");
280 fw3_free_redirect(redir
);
283 else if (redir
->ipset
.set
&&
284 !(redir
->ipset
.ptr
= fw3_lookup_ipset(state
, redir
->ipset
.name
)))
286 warn_elem(e
, "refers to unknown ipset '%s'", redir
->ipset
.name
);
287 fw3_free_redirect(redir
);
291 if (!check_families(e
, redir
))
293 fw3_free_redirect(redir
);
297 if (redir
->target
== FW3_FLAG_UNSPEC
)
299 warn_elem(e
, "has no target specified, defaulting to DNAT");
300 redir
->target
= FW3_FLAG_DNAT
;
302 else if (redir
->target
< FW3_FLAG_DNAT
|| redir
->target
> FW3_FLAG_SNAT
)
304 warn_elem(e
, "has invalid target specified, defaulting to DNAT");
305 redir
->target
= FW3_FLAG_DNAT
;
308 if (redir
->target
== FW3_FLAG_DNAT
)
311 warn_elem(e
, "must not have source '*' for DNAT target");
312 else if (!redir
->_src
)
313 warn_elem(e
, "has no source specified");
316 set(redir
->_src
->flags
, FW3_FAMILY_V4
, redir
->target
);
317 redir
->_src
->conntrack
= true;
321 if (!check_local(e
, redir
, state
) && !redir
->dest
.set
&&
322 resolve_dest(e
, redir
, state
))
324 warn_elem(e
, "does not specify a destination, assuming '%s'",
328 if (redir
->reflection
&& redir
->_dest
&& redir
->_src
->masq
)
330 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_ACCEPT
);
331 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_DNAT
);
332 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_SNAT
);
338 warn_elem(e
, "must not have destination '*' for SNAT target");
339 else if (!redir
->_dest
)
340 warn_elem(e
, "has no destination specified");
341 else if (!redir
->ip_dest
.set
)
342 warn_elem(e
, "has no src_dip option specified");
343 else if (!list_empty(&redir
->mac_src
))
344 warn_elem(e
, "must not use 'src_mac' option for SNAT target");
347 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, redir
->target
);
348 redir
->_dest
->conntrack
= true;
353 if (list_empty(&redir
->proto
))
355 warn_elem(e
, "does not specify a protocol, assuming TCP+UDP");
356 fw3_parse_protocol(&redir
->proto
, "tcpudp", true);
361 fw3_free_redirect(redir
);
365 if (!redir
->port_redir
.set
)
366 redir
->port_redir
= redir
->port_dest
;
368 list_add_tail(&redir
->list
, &state
->redirects
);
373 append_chain_nat(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
375 if (redir
->target
== FW3_FLAG_DNAT
)
376 fw3_ipt_rule_append(r
, "zone_%s_prerouting", redir
->src
.name
);
378 fw3_ipt_rule_append(r
, "zone_%s_postrouting", redir
->dest
.name
);
382 set_snat_dnat(struct fw3_ipt_rule
*r
, enum fw3_flag target
,
383 struct fw3_address
*addr
, struct fw3_port
*port
)
385 char buf
[sizeof("255.255.255.255:65535-65535\0")];
389 if (addr
&& addr
->set
)
391 inet_ntop(AF_INET
, &addr
->address
.v4
, buf
, sizeof(buf
));
394 if (port
&& port
->set
)
396 if (port
->port_min
== port
->port_max
)
397 sprintf(buf
+ strlen(buf
), ":%u", port
->port_min
);
399 sprintf(buf
+ strlen(buf
), ":%u-%u",
400 port
->port_min
, port
->port_max
);
403 if (target
== FW3_FLAG_DNAT
)
405 fw3_ipt_rule_target(r
, "DNAT");
406 fw3_ipt_rule_addarg(r
, false, "--to-destination", buf
);
410 fw3_ipt_rule_target(r
, "SNAT");
411 fw3_ipt_rule_addarg(r
, false, "--to-source", buf
);
416 set_target_nat(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
418 if (redir
->target
== FW3_FLAG_DNAT
)
419 set_snat_dnat(r
, redir
->target
, &redir
->ip_redir
, &redir
->port_redir
);
421 set_snat_dnat(r
, redir
->target
, &redir
->ip_dest
, &redir
->port_dest
);
425 set_comment(struct fw3_ipt_rule
*r
, const char *name
, int num
, bool ref
)
430 fw3_ipt_rule_comment(r
, "%s (reflection)", name
);
432 fw3_ipt_rule_comment(r
, name
);
437 fw3_ipt_rule_comment(r
, "@redirect[%u] (reflection)", num
);
439 fw3_ipt_rule_comment(r
, "@redirect[%u]", num
);
444 print_redirect(struct fw3_ipt_handle
*h
, struct fw3_state
*state
,
445 struct fw3_redirect
*redir
, int num
,
446 struct fw3_protocol
*proto
, struct fw3_mac
*mac
)
448 struct fw3_ipt_rule
*r
;
449 struct fw3_address
*src
, *dst
;
450 struct fw3_port
*spt
, *dpt
;
455 src
= &redir
->ip_src
;
456 dst
= &redir
->ip_dest
;
457 spt
= &redir
->port_src
;
458 dpt
= &redir
->port_dest
;
460 if (redir
->target
== FW3_FLAG_SNAT
)
462 dst
= &redir
->ip_redir
;
463 dpt
= &redir
->port_redir
;
466 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, src
, dst
);
467 fw3_ipt_rule_sport_dport(r
, spt
, dpt
);
468 fw3_ipt_rule_mac(r
, mac
);
469 fw3_ipt_rule_ipset(r
, &redir
->ipset
);
470 fw3_ipt_rule_limit(r
, &redir
->limit
);
471 fw3_ipt_rule_time(r
, &redir
->time
);
472 fw3_ipt_rule_mark(r
, &redir
->mark
);
473 set_target_nat(r
, redir
);
474 fw3_ipt_rule_extra(r
, redir
->extra
);
475 set_comment(r
, redir
->name
, num
, false);
476 append_chain_nat(r
, redir
);
485 print_reflection(struct fw3_ipt_handle
*h
, struct fw3_state
*state
,
486 struct fw3_redirect
*redir
, int num
,
487 struct fw3_protocol
*proto
, struct fw3_address
*ra
,
488 struct fw3_address
*ia
, struct fw3_address
*ea
)
490 struct fw3_ipt_rule
*r
;
495 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, ia
, ea
);
496 fw3_ipt_rule_sport_dport(r
, NULL
, &redir
->port_dest
);
497 fw3_ipt_rule_limit(r
, &redir
->limit
);
498 fw3_ipt_rule_time(r
, &redir
->time
);
499 set_comment(r
, redir
->name
, num
, true);
500 set_snat_dnat(r
, FW3_FLAG_DNAT
, &redir
->ip_redir
, &redir
->port_redir
);
501 fw3_ipt_rule_replace(r
, "zone_%s_prerouting", redir
->dest
.name
);
503 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, ia
, &redir
->ip_redir
);
504 fw3_ipt_rule_sport_dport(r
, NULL
, &redir
->port_redir
);
505 fw3_ipt_rule_limit(r
, &redir
->limit
);
506 fw3_ipt_rule_time(r
, &redir
->time
);
507 set_comment(r
, redir
->name
, num
, true);
508 set_snat_dnat(r
, FW3_FLAG_SNAT
, ra
, NULL
);
509 fw3_ipt_rule_replace(r
, "zone_%s_postrouting", redir
->dest
.name
);
518 expand_redirect(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
519 struct fw3_redirect
*redir
, int num
)
521 struct list_head
*ext_addrs
, *int_addrs
;
522 struct fw3_address
*ext_addr
, *int_addr
, ref_addr
;
523 struct fw3_protocol
*proto
;
527 info(" * Redirect '%s'", redir
->name
);
529 info(" * Redirect #%u", num
);
531 if (!fw3_is_family(redir
->_src
, handle
->family
) ||
532 !fw3_is_family(redir
->_dest
, handle
->family
))
534 info(" ! Skipping due to different family of zone");
538 if (!fw3_is_family(&redir
->ip_src
, handle
->family
) ||
539 !fw3_is_family(&redir
->ip_dest
, handle
->family
) ||
540 !fw3_is_family(&redir
->ip_redir
, handle
->family
))
542 if (!redir
->ip_src
.resolved
||
543 !redir
->ip_dest
.resolved
||
544 !redir
->ip_redir
.resolved
)
545 info(" ! Skipping due to different family of ip address");
550 if (redir
->ipset
.ptr
)
552 if (!fw3_is_family(redir
->ipset
.ptr
, handle
->family
))
554 info(" ! Skipping due to different family in ipset");
558 if (!fw3_check_ipset(redir
->ipset
.ptr
))
560 info(" ! Skipping due to missing ipset '%s'",
561 redir
->ipset
.ptr
->external
?
562 redir
->ipset
.ptr
->external
: redir
->ipset
.ptr
->name
);
566 set(redir
->ipset
.ptr
->flags
, handle
->family
, handle
->family
);
569 fw3_foreach(proto
, &redir
->proto
)
570 fw3_foreach(mac
, &redir
->mac_src
)
571 print_redirect(handle
, state
, redir
, num
, proto
, mac
);
573 /* reflection rules */
574 if (redir
->target
!= FW3_FLAG_DNAT
|| !redir
->reflection
)
577 if (!redir
->_dest
|| !redir
->_src
->masq
)
580 ext_addrs
= fw3_resolve_zone_addresses(redir
->_src
);
581 int_addrs
= fw3_resolve_zone_addresses(redir
->_dest
);
583 if (!ext_addrs
|| !int_addrs
)
586 list_for_each_entry(ext_addr
, ext_addrs
, list
)
588 if (!fw3_is_family(ext_addr
, handle
->family
))
591 list_for_each_entry(int_addr
, int_addrs
, list
)
593 if (!fw3_is_family(int_addr
, handle
->family
))
596 fw3_foreach(proto
, &redir
->proto
)
601 if (redir
->reflection_src
== FW3_REFLECTION_INTERNAL
)
602 ref_addr
= *int_addr
;
604 ref_addr
= *ext_addr
;
609 print_reflection(handle
, state
, redir
, num
, proto
,
610 &ref_addr
, int_addr
, ext_addr
);
616 fw3_free_list(ext_addrs
);
617 fw3_free_list(int_addrs
);
621 fw3_print_redirects(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
)
624 struct fw3_redirect
*redir
;
626 if (handle
->family
== FW3_FAMILY_V6
)
629 if (handle
->table
!= FW3_TABLE_FILTER
&& handle
->table
!= FW3_TABLE_NAT
)
632 list_for_each_entry(redir
, &state
->redirects
, list
)
633 expand_redirect(handle
, state
, redir
, num
++);