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.
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("utc_time", bool, redirect
, time
.utc
),
48 FW3_OPT("start_date", date
, redirect
, time
.datestart
),
49 FW3_OPT("stop_date", date
, redirect
, time
.datestop
),
50 FW3_OPT("start_time", time
, redirect
, time
.timestart
),
51 FW3_OPT("stop_time", time
, redirect
, time
.timestop
),
52 FW3_OPT("weekdays", weekdays
, redirect
, time
.weekdays
),
53 FW3_OPT("monthdays", monthdays
, redirect
, time
.monthdays
),
55 FW3_OPT("mark", mark
, redirect
, mark
),
57 FW3_OPT("reflection", bool, redirect
, reflection
),
58 FW3_OPT("reflection_src", reflection_source
,
59 redirect
, reflection_src
),
61 FW3_OPT("target", target
, redirect
, target
),
68 check_families(struct uci_element
*e
, struct fw3_redirect
*r
)
70 if (r
->family
== FW3_FAMILY_ANY
)
73 if (r
->_src
&& r
->_src
->family
&& r
->_src
->family
!= r
->family
)
75 warn_elem(e
, "refers to source zone with different family");
79 if (r
->_dest
&& r
->_dest
->family
&& r
->_dest
->family
!= r
->family
)
81 warn_elem(e
, "refers to destination zone with different family");
85 if (r
->ipset
.ptr
&& r
->ipset
.ptr
->family
&&
86 r
->ipset
.ptr
->family
!= r
->family
)
88 warn_elem(e
, "refers to ipset with different family");
92 if (r
->ip_src
.family
&& r
->ip_src
.family
!= r
->family
)
94 warn_elem(e
, "uses source ip with different family");
98 if (r
->ip_dest
.family
&& r
->ip_dest
.family
!= r
->family
)
100 warn_elem(e
, "uses destination ip with different family");
104 if (r
->ip_redir
.family
&& r
->ip_redir
.family
!= r
->family
)
106 warn_elem(e
, "uses redirect ip with different family");
114 compare_addr(struct fw3_address
*a
, struct fw3_address
*b
)
118 if (a
->family
!= FW3_FAMILY_V4
)
121 mask
= ~((1 << (32 - a
->mask
)) - 1);
123 return ((a
->address
.v4
.s_addr
& mask
) == (b
->address
.v4
.s_addr
& mask
));
127 resolve_dest(struct uci_element
*e
, struct fw3_redirect
*redir
,
128 struct fw3_state
*state
)
130 struct fw3_zone
*zone
;
131 struct fw3_address
*addr
;
132 struct list_head
*addrs
;
134 if (!redir
->ip_redir
.set
)
137 list_for_each_entry(zone
, &state
->zones
, list
)
139 addrs
= fw3_resolve_zone_addresses(zone
);
144 list_for_each_entry(addr
, addrs
, list
)
146 if (!compare_addr(addr
, &redir
->ip_redir
))
149 strncpy(redir
->dest
.name
, zone
->name
, sizeof(redir
->dest
.name
));
150 redir
->dest
.set
= true;
156 fw3_free_list(addrs
);
166 fw3_load_redirects(struct fw3_state
*state
, struct uci_package
*p
)
168 struct uci_section
*s
;
169 struct uci_element
*e
;
170 struct fw3_redirect
*redir
;
174 INIT_LIST_HEAD(&state
->redirects
);
176 uci_foreach_element(&p
->sections
, e
)
178 s
= uci_to_section(e
);
180 if (strcmp(s
->type
, "redirect"))
183 redir
= malloc(sizeof(*redir
));
188 memset(redir
, 0, sizeof(*redir
));
190 INIT_LIST_HEAD(&redir
->proto
);
191 INIT_LIST_HEAD(&redir
->mac_src
);
193 redir
->enabled
= true;
194 redir
->reflection
= true;
198 fw3_parse_options(redir
, fw3_redirect_opts
, s
);
202 fw3_free_redirect(redir
);
206 if (redir
->src
.invert
)
208 warn_elem(e
, "must not have an inverted source");
209 fw3_free_redirect(redir
);
212 else if (redir
->src
.set
&& !redir
->src
.any
&&
213 !(redir
->_src
= fw3_lookup_zone(state
, redir
->src
.name
)))
215 warn_elem(e
, "refers to not existing zone '%s'", redir
->src
.name
);
216 fw3_free_redirect(redir
);
219 else if (redir
->dest
.set
&& !redir
->dest
.any
&&
220 !(redir
->_dest
= fw3_lookup_zone(state
, redir
->dest
.name
)))
222 warn_elem(e
, "refers to not existing zone '%s'", redir
->dest
.name
);
223 fw3_free_redirect(redir
);
226 else if (redir
->ipset
.set
&& state
->disable_ipsets
)
228 warn_elem(e
, "skipped due to disabled ipset support");
229 fw3_free_redirect(redir
);
232 else if (redir
->ipset
.set
&&
233 !(redir
->ipset
.ptr
= fw3_lookup_ipset(state
, redir
->ipset
.name
)))
235 warn_elem(e
, "refers to unknown ipset '%s'", redir
->ipset
.name
);
236 fw3_free_redirect(redir
);
240 if (!check_families(e
, redir
))
242 fw3_free_redirect(redir
);
246 if (redir
->target
== FW3_FLAG_UNSPEC
)
248 warn_elem(e
, "has no target specified, defaulting to DNAT");
249 redir
->target
= FW3_FLAG_DNAT
;
251 else if (redir
->target
< FW3_FLAG_DNAT
)
253 warn_elem(e
, "has invalid target specified, defaulting to DNAT");
254 redir
->target
= FW3_FLAG_DNAT
;
257 if (redir
->target
== FW3_FLAG_DNAT
)
260 warn_elem(e
, "must not have source '*' for DNAT target");
261 else if (!redir
->_src
)
262 warn_elem(e
, "has no source specified");
265 set(redir
->_src
->flags
, FW3_FAMILY_V4
, redir
->target
);
266 redir
->_src
->conntrack
= true;
270 if (!redir
->dest
.set
&& resolve_dest(e
, redir
, state
))
272 warn_elem(e
, "does not specify a destination, assuming '%s'",
276 if (redir
->reflection
&& redir
->_dest
&& redir
->_src
->masq
)
278 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_ACCEPT
);
279 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_DNAT
);
280 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_SNAT
);
286 warn_elem(e
, "must not have destination '*' for SNAT target");
287 else if (!redir
->_dest
)
288 warn_elem(e
, "has no destination specified");
289 else if (!redir
->ip_dest
.set
)
290 warn_elem(e
, "has no src_dip option specified");
291 else if (!list_empty(&redir
->mac_src
))
292 warn_elem(e
, "must not use 'src_mac' option for SNAT target");
295 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, redir
->target
);
296 redir
->_dest
->conntrack
= true;
301 if (list_empty(&redir
->proto
))
303 warn_elem(e
, "does not specify a protocol, assuming TCP+UDP");
304 fw3_parse_protocol(&redir
->proto
, "tcpudp", true);
309 fw3_free_redirect(redir
);
313 if (!redir
->port_redir
.set
)
314 redir
->port_redir
= redir
->port_dest
;
316 list_add_tail(&redir
->list
, &state
->redirects
);
321 append_chain_nat(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
323 if (redir
->target
== FW3_FLAG_DNAT
)
324 fw3_ipt_rule_append(r
, "zone_%s_prerouting", redir
->src
.name
);
326 fw3_ipt_rule_append(r
, "zone_%s_postrouting", redir
->dest
.name
);
330 set_snat_dnat(struct fw3_ipt_rule
*r
, enum fw3_flag target
,
331 struct fw3_address
*addr
, struct fw3_port
*port
)
333 char buf
[sizeof("255.255.255.255:65535-65535\0")];
337 if (addr
&& addr
->set
)
339 inet_ntop(AF_INET
, &addr
->address
.v4
, buf
, sizeof(buf
));
342 if (port
&& port
->set
)
344 if (port
->port_min
== port
->port_max
)
345 sprintf(buf
+ strlen(buf
), ":%u", port
->port_min
);
347 sprintf(buf
+ strlen(buf
), ":%u-%u",
348 port
->port_min
, port
->port_max
);
351 if (target
== FW3_FLAG_DNAT
)
353 fw3_ipt_rule_target(r
, "DNAT");
354 fw3_ipt_rule_addarg(r
, false, "--to-destination", buf
);
358 fw3_ipt_rule_target(r
, "SNAT");
359 fw3_ipt_rule_addarg(r
, false, "--to-source", buf
);
364 set_target_nat(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
366 if (redir
->target
== FW3_FLAG_DNAT
)
367 set_snat_dnat(r
, redir
->target
, &redir
->ip_redir
, &redir
->port_redir
);
369 set_snat_dnat(r
, redir
->target
, &redir
->ip_dest
, &redir
->port_dest
);
373 append_chain_filter(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
375 if (redir
->target
== FW3_FLAG_DNAT
)
377 /* XXX: check for local ip */
378 if (!redir
->ip_redir
.set
)
379 fw3_ipt_rule_append(r
, "zone_%s_input", redir
->src
.name
);
381 fw3_ipt_rule_append(r
, "zone_%s_forward", redir
->src
.name
);
385 if (redir
->src
.set
&& !redir
->src
.any
)
386 fw3_ipt_rule_append(r
, "zone_%s_forward", redir
->src
.name
);
388 fw3_ipt_rule_append(r
, "delegate_forward");
393 set_target_filter(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
395 /* XXX: check for local ip */
396 if (redir
->target
== FW3_FLAG_DNAT
&& !redir
->ip_redir
.set
)
397 fw3_ipt_rule_extra(r
, "-m conntrack --ctstate DNAT");
399 fw3_ipt_rule_target(r
, "ACCEPT");
403 set_comment(struct fw3_ipt_rule
*r
, const char *name
, int num
, bool ref
)
408 fw3_ipt_rule_comment(r
, "%s (reflection)", name
);
410 fw3_ipt_rule_comment(r
, name
);
415 fw3_ipt_rule_comment(r
, "@redirect[%u] (reflection)", num
);
417 fw3_ipt_rule_comment(r
, "@redirect[%u]", num
);
422 print_redirect(struct fw3_ipt_handle
*h
, struct fw3_state
*state
,
423 struct fw3_redirect
*redir
, int num
,
424 struct fw3_protocol
*proto
, struct fw3_mac
*mac
)
426 struct fw3_ipt_rule
*r
;
427 struct fw3_address
*src
, *dst
;
428 struct fw3_port
*spt
, *dpt
;
433 src
= &redir
->ip_src
;
434 dst
= &redir
->ip_dest
;
435 spt
= &redir
->port_src
;
436 dpt
= &redir
->port_dest
;
438 if (redir
->target
== FW3_FLAG_SNAT
)
440 dst
= &redir
->ip_redir
;
441 dpt
= &redir
->port_redir
;
444 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, src
, dst
);
445 fw3_ipt_rule_sport_dport(r
, spt
, dpt
);
446 fw3_ipt_rule_mac(r
, mac
);
447 fw3_ipt_rule_ipset(r
, &redir
->ipset
);
448 fw3_ipt_rule_time(r
, &redir
->time
);
449 fw3_ipt_rule_mark(r
, &redir
->mark
);
450 set_target_nat(r
, redir
);
451 fw3_ipt_rule_extra(r
, redir
->extra
);
452 set_comment(r
, redir
->name
, num
, false);
453 append_chain_nat(r
, redir
);
456 case FW3_TABLE_FILTER
:
457 src
= &redir
->ip_src
;
458 dst
= &redir
->ip_redir
;
459 spt
= &redir
->port_src
;
460 dpt
= &redir
->port_redir
;
462 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, src
, dst
);
463 fw3_ipt_rule_sport_dport(r
, spt
, dpt
);
464 fw3_ipt_rule_mac(r
, mac
);
465 fw3_ipt_rule_ipset(r
, &redir
->ipset
);
466 fw3_ipt_rule_time(r
, &redir
->time
);
467 fw3_ipt_rule_mark(r
, &redir
->mark
);
468 set_target_filter(r
, redir
);
469 fw3_ipt_rule_extra(r
, redir
->extra
);
470 set_comment(r
, redir
->name
, num
, false);
471 append_chain_filter(r
, redir
);
480 print_reflection(struct fw3_ipt_handle
*h
, struct fw3_state
*state
,
481 struct fw3_redirect
*redir
, int num
,
482 struct fw3_protocol
*proto
, struct fw3_address
*ra
,
483 struct fw3_address
*ia
, struct fw3_address
*ea
)
485 struct fw3_ipt_rule
*r
;
490 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, ia
, ea
);
491 fw3_ipt_rule_sport_dport(r
, NULL
, &redir
->port_dest
);
492 fw3_ipt_rule_time(r
, &redir
->time
);
493 set_comment(r
, redir
->name
, num
, true);
494 set_snat_dnat(r
, FW3_FLAG_DNAT
, &redir
->ip_redir
, &redir
->port_redir
);
495 fw3_ipt_rule_append(r
, "zone_%s_prerouting", redir
->dest
.name
);
497 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, ia
, &redir
->ip_redir
);
498 fw3_ipt_rule_sport_dport(r
, NULL
, &redir
->port_redir
);
499 fw3_ipt_rule_time(r
, &redir
->time
);
500 set_comment(r
, redir
->name
, num
, true);
501 set_snat_dnat(r
, FW3_FLAG_SNAT
, ra
, NULL
);
502 fw3_ipt_rule_append(r
, "zone_%s_postrouting", redir
->dest
.name
);
505 case FW3_TABLE_FILTER
:
506 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, ia
, &redir
->ip_redir
);
507 fw3_ipt_rule_sport_dport(r
, NULL
, &redir
->port_redir
);
508 fw3_ipt_rule_time(r
, &redir
->time
);
509 set_comment(r
, redir
->name
, num
, true);
510 fw3_ipt_rule_target(r
, "zone_%s_dest_ACCEPT", redir
->dest
.name
);
511 fw3_ipt_rule_append(r
, "zone_%s_forward", redir
->dest
.name
);
520 expand_redirect(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
521 struct fw3_redirect
*redir
, int num
)
523 struct list_head
*ext_addrs
, *int_addrs
;
524 struct fw3_address
*ext_addr
, *int_addr
, ref_addr
;
525 struct fw3_protocol
*proto
;
529 info(" * Redirect '%s'", redir
->name
);
531 info(" * Redirect #%u", num
);
533 if (!fw3_is_family(redir
->_src
, handle
->family
) ||
534 !fw3_is_family(redir
->_dest
, handle
->family
))
536 info(" ! Skipping due to different family of zone");
540 if (!fw3_is_family(&redir
->ip_src
, handle
->family
) ||
541 !fw3_is_family(&redir
->ip_dest
, handle
->family
) ||
542 !fw3_is_family(&redir
->ip_redir
, handle
->family
))
544 if (!redir
->ip_src
.resolved
||
545 !redir
->ip_dest
.resolved
||
546 !redir
->ip_redir
.resolved
)
547 info(" ! Skipping due to different family of ip address");
552 if (redir
->ipset
.ptr
)
554 if (!fw3_is_family(redir
->ipset
.ptr
, handle
->family
))
556 info(" ! Skipping due to different family in ipset");
560 if (!fw3_check_ipset(redir
->ipset
.ptr
))
562 info(" ! Skipping due to missing ipset '%s'",
563 redir
->ipset
.ptr
->external
?
564 redir
->ipset
.ptr
->external
: redir
->ipset
.ptr
->name
);
568 set(redir
->ipset
.ptr
->flags
, handle
->family
, handle
->family
);
571 fw3_foreach(proto
, &redir
->proto
)
572 fw3_foreach(mac
, &redir
->mac_src
)
573 print_redirect(handle
, state
, redir
, num
, proto
, mac
);
575 /* reflection rules */
576 if (redir
->target
!= FW3_FLAG_DNAT
|| !redir
->reflection
)
579 if (!redir
->_dest
|| !redir
->_src
->masq
)
582 ext_addrs
= fw3_resolve_zone_addresses(redir
->_src
);
583 int_addrs
= fw3_resolve_zone_addresses(redir
->_dest
);
585 if (!ext_addrs
|| !int_addrs
)
588 list_for_each_entry(ext_addr
, ext_addrs
, list
)
590 if (!fw3_is_family(ext_addr
, handle
->family
))
593 list_for_each_entry(int_addr
, int_addrs
, list
)
595 if (!fw3_is_family(int_addr
, handle
->family
))
598 fw3_foreach(proto
, &redir
->proto
)
600 if (!proto
|| (proto
->protocol
!= 6 && proto
->protocol
!= 17))
603 if (redir
->reflection_src
== FW3_REFLECTION_INTERNAL
)
604 ref_addr
= *int_addr
;
606 ref_addr
= *ext_addr
;
611 print_reflection(handle
, state
, redir
, num
, proto
,
612 &ref_addr
, int_addr
, ext_addr
);
618 fw3_free_list(ext_addrs
);
619 fw3_free_list(int_addrs
);
623 fw3_print_redirects(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
)
626 struct fw3_redirect
*redir
;
628 if (handle
->family
== FW3_FAMILY_V6
)
631 if (handle
->table
!= FW3_TABLE_FILTER
&& handle
->table
!= FW3_TABLE_NAT
)
634 list_for_each_entry(redir
, &state
->redirects
, list
)
635 expand_redirect(handle
, state
, redir
, num
++);