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", device
, 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
&& r
->_ipset
->family
&& r
->_ipset
->family
!= r
->family
)
87 warn_elem(e
, "refers to ipset with different family");
91 if (r
->ip_src
.family
&& r
->ip_src
.family
!= r
->family
)
93 warn_elem(e
, "uses source ip with different family");
97 if (r
->ip_dest
.family
&& r
->ip_dest
.family
!= r
->family
)
99 warn_elem(e
, "uses destination ip with different family");
103 if (r
->ip_redir
.family
&& r
->ip_redir
.family
!= r
->family
)
105 warn_elem(e
, "uses redirect ip with different family");
113 compare_addr(struct fw3_address
*a
, struct fw3_address
*b
)
117 if (a
->family
!= FW3_FAMILY_V4
)
120 mask
= ~((1 << (32 - a
->mask
)) - 1);
122 return ((a
->address
.v4
.s_addr
& mask
) == (b
->address
.v4
.s_addr
& mask
));
126 resolve_dest(struct uci_element
*e
, struct fw3_redirect
*redir
,
127 struct fw3_state
*state
)
129 struct fw3_zone
*zone
;
130 struct fw3_address
*addr
;
131 struct list_head
*addrs
;
133 if (!redir
->ip_redir
.set
)
136 list_for_each_entry(zone
, &state
->zones
, list
)
138 addrs
= fw3_resolve_zone_addresses(zone
);
143 list_for_each_entry(addr
, addrs
, list
)
145 if (!compare_addr(addr
, &redir
->ip_redir
))
148 strncpy(redir
->dest
.name
, zone
->name
, sizeof(redir
->dest
.name
));
149 redir
->dest
.set
= true;
155 fw3_free_list(addrs
);
165 fw3_load_redirects(struct fw3_state
*state
, struct uci_package
*p
)
167 struct uci_section
*s
;
168 struct uci_element
*e
;
169 struct fw3_redirect
*redir
;
173 INIT_LIST_HEAD(&state
->redirects
);
175 uci_foreach_element(&p
->sections
, e
)
177 s
= uci_to_section(e
);
179 if (strcmp(s
->type
, "redirect"))
182 redir
= malloc(sizeof(*redir
));
187 memset(redir
, 0, sizeof(*redir
));
189 INIT_LIST_HEAD(&redir
->proto
);
190 INIT_LIST_HEAD(&redir
->mac_src
);
192 redir
->enabled
= true;
193 redir
->reflection
= true;
197 fw3_parse_options(redir
, fw3_redirect_opts
, s
);
201 fw3_free_redirect(redir
);
205 if (redir
->src
.invert
)
207 warn_elem(e
, "must not have an inverted source");
208 fw3_free_redirect(redir
);
211 else if (redir
->src
.set
&& !redir
->src
.any
&&
212 !(redir
->_src
= fw3_lookup_zone(state
, redir
->src
.name
)))
214 warn_elem(e
, "refers to not existing zone '%s'", redir
->src
.name
);
215 fw3_free_redirect(redir
);
218 else if (redir
->dest
.set
&& !redir
->dest
.any
&&
219 !(redir
->_dest
= fw3_lookup_zone(state
, redir
->dest
.name
)))
221 warn_elem(e
, "refers to not existing zone '%s'", redir
->dest
.name
);
222 fw3_free_redirect(redir
);
225 else if (redir
->ipset
.set
&& state
->disable_ipsets
)
227 warn_elem(e
, "skipped due to disabled ipset support");
228 fw3_free_redirect(redir
);
231 else if (redir
->ipset
.set
&& !redir
->ipset
.any
&&
232 !(redir
->_ipset
= fw3_lookup_ipset(state
, redir
->ipset
.name
)))
234 warn_elem(e
, "refers to unknown ipset '%s'", redir
->ipset
.name
);
235 fw3_free_redirect(redir
);
239 if (!check_families(e
, redir
))
241 fw3_free_redirect(redir
);
245 if (redir
->target
== FW3_FLAG_UNSPEC
)
247 warn_elem(e
, "has no target specified, defaulting to DNAT");
248 redir
->target
= FW3_FLAG_DNAT
;
250 else if (redir
->target
< FW3_FLAG_DNAT
)
252 warn_elem(e
, "has invalid target specified, defaulting to DNAT");
253 redir
->target
= FW3_FLAG_DNAT
;
256 if (redir
->target
== FW3_FLAG_DNAT
)
259 warn_elem(e
, "must not have source '*' for DNAT target");
260 else if (!redir
->_src
)
261 warn_elem(e
, "has no source specified");
264 set(redir
->_src
->flags
, FW3_FAMILY_V4
, redir
->target
);
265 redir
->_src
->conntrack
= true;
269 if (!redir
->dest
.set
&& resolve_dest(e
, redir
, state
))
271 warn_elem(e
, "does not specify a destination, assuming '%s'",
275 if (redir
->reflection
&& redir
->_dest
&& redir
->_src
->masq
)
277 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_ACCEPT
);
278 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_DNAT
);
279 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_SNAT
);
285 warn_elem(e
, "must not have destination '*' for SNAT target");
286 else if (!redir
->_dest
)
287 warn_elem(e
, "has no destination specified");
288 else if (!redir
->ip_dest
.set
)
289 warn_elem(e
, "has no src_dip option specified");
290 else if (!list_empty(&redir
->mac_src
))
291 warn_elem(e
, "must not use 'src_mac' option for SNAT target");
294 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, redir
->target
);
295 redir
->_dest
->conntrack
= true;
300 if (list_empty(&redir
->proto
))
302 warn_elem(e
, "does not specify a protocol, assuming TCP+UDP");
303 fw3_parse_protocol(&redir
->proto
, "tcpudp", true);
308 fw3_free_redirect(redir
);
312 if (!redir
->port_redir
.set
)
313 redir
->port_redir
= redir
->port_dest
;
315 list_add_tail(&redir
->list
, &state
->redirects
);
320 append_chain_nat(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
322 if (redir
->target
== FW3_FLAG_DNAT
)
323 fw3_ipt_rule_append(r
, "zone_%s_prerouting", redir
->src
.name
);
325 fw3_ipt_rule_append(r
, "zone_%s_postrouting", redir
->dest
.name
);
329 set_snat_dnat(struct fw3_ipt_rule
*r
, enum fw3_flag target
,
330 struct fw3_address
*addr
, struct fw3_port
*port
)
332 char buf
[sizeof("255.255.255.255:65535-65535\0")];
336 if (addr
&& addr
->set
)
338 inet_ntop(AF_INET
, &addr
->address
.v4
, buf
, sizeof(buf
));
341 if (port
&& port
->set
)
343 if (port
->port_min
== port
->port_max
)
344 sprintf(buf
+ strlen(buf
), ":%u", port
->port_min
);
346 sprintf(buf
+ strlen(buf
), ":%u-%u",
347 port
->port_min
, port
->port_max
);
350 if (target
== FW3_FLAG_DNAT
)
352 fw3_ipt_rule_target(r
, "DNAT");
353 fw3_ipt_rule_addarg(r
, false, "--to-destination", buf
);
357 fw3_ipt_rule_target(r
, "SNAT");
358 fw3_ipt_rule_addarg(r
, false, "--to-source", buf
);
363 set_target_nat(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
365 if (redir
->target
== FW3_FLAG_DNAT
)
366 set_snat_dnat(r
, redir
->target
, &redir
->ip_redir
, &redir
->port_redir
);
368 set_snat_dnat(r
, redir
->target
, &redir
->ip_dest
, &redir
->port_dest
);
372 append_chain_filter(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
374 if (redir
->target
== FW3_FLAG_DNAT
)
376 /* XXX: check for local ip */
377 if (!redir
->ip_redir
.set
)
378 fw3_ipt_rule_append(r
, "zone_%s_input", redir
->src
.name
);
380 fw3_ipt_rule_append(r
, "zone_%s_forward", redir
->src
.name
);
384 if (redir
->src
.set
&& !redir
->src
.any
)
385 fw3_ipt_rule_append(r
, "zone_%s_forward", redir
->src
.name
);
387 fw3_ipt_rule_append(r
, "delegate_forward");
392 set_target_filter(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
394 /* XXX: check for local ip */
395 if (redir
->target
== FW3_FLAG_DNAT
&& !redir
->ip_redir
.set
)
396 fw3_ipt_rule_extra(r
, "-m conntrack --ctstate DNAT");
398 fw3_ipt_rule_target(r
, "ACCEPT");
402 set_comment(struct fw3_ipt_rule
*r
, const char *name
, int num
, bool ref
)
407 fw3_ipt_rule_comment(r
, "%s (reflection)", name
);
409 fw3_ipt_rule_comment(r
, name
);
414 fw3_ipt_rule_comment(r
, "@redirect[%u] (reflection)", num
);
416 fw3_ipt_rule_comment(r
, "@redirect[%u]", num
);
421 print_redirect(struct fw3_ipt_handle
*h
, struct fw3_state
*state
,
422 struct fw3_redirect
*redir
, int num
,
423 struct fw3_protocol
*proto
, struct fw3_mac
*mac
)
425 struct fw3_ipt_rule
*r
;
426 struct fw3_address
*src
, *dst
;
427 struct fw3_port
*spt
, *dpt
;
432 src
= &redir
->ip_src
;
433 dst
= &redir
->ip_dest
;
434 spt
= &redir
->port_src
;
435 dpt
= &redir
->port_dest
;
437 if (redir
->target
== FW3_FLAG_SNAT
)
439 dst
= &redir
->ip_redir
;
440 dpt
= &redir
->port_redir
;
443 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, src
, dst
);
444 fw3_ipt_rule_sport_dport(r
, spt
, dpt
);
445 fw3_ipt_rule_mac(r
, mac
);
446 fw3_ipt_rule_ipset(r
, redir
->_ipset
, redir
->ipset
.invert
);
447 fw3_ipt_rule_time(r
, &redir
->time
);
448 fw3_ipt_rule_mark(r
, &redir
->mark
);
449 set_target_nat(r
, redir
);
450 fw3_ipt_rule_extra(r
, redir
->extra
);
451 set_comment(r
, redir
->name
, num
, false);
452 append_chain_nat(r
, redir
);
455 case FW3_TABLE_FILTER
:
456 src
= &redir
->ip_src
;
457 dst
= &redir
->ip_redir
;
458 spt
= &redir
->port_src
;
459 dpt
= &redir
->port_redir
;
461 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, src
, dst
);
462 fw3_ipt_rule_sport_dport(r
, spt
, dpt
);
463 fw3_ipt_rule_mac(r
, mac
);
464 fw3_ipt_rule_ipset(r
, redir
->_ipset
, redir
->ipset
.invert
);
465 fw3_ipt_rule_time(r
, &redir
->time
);
466 fw3_ipt_rule_mark(r
, &redir
->mark
);
467 set_target_filter(r
, redir
);
468 fw3_ipt_rule_extra(r
, redir
->extra
);
469 set_comment(r
, redir
->name
, num
, false);
470 append_chain_filter(r
, redir
);
479 print_reflection(struct fw3_ipt_handle
*h
, struct fw3_state
*state
,
480 struct fw3_redirect
*redir
, int num
,
481 struct fw3_protocol
*proto
, struct fw3_address
*ra
,
482 struct fw3_address
*ia
, struct fw3_address
*ea
)
484 struct fw3_ipt_rule
*r
;
489 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, ia
, ea
);
490 fw3_ipt_rule_sport_dport(r
, NULL
, &redir
->port_dest
);
491 fw3_ipt_rule_time(r
, &redir
->time
);
492 set_comment(r
, redir
->name
, num
, true);
493 set_snat_dnat(r
, FW3_FLAG_DNAT
, &redir
->ip_redir
, &redir
->port_redir
);
494 fw3_ipt_rule_append(r
, "zone_%s_prerouting", redir
->dest
.name
);
496 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, ia
, &redir
->ip_redir
);
497 fw3_ipt_rule_sport_dport(r
, NULL
, &redir
->port_redir
);
498 fw3_ipt_rule_time(r
, &redir
->time
);
499 set_comment(r
, redir
->name
, num
, true);
500 set_snat_dnat(r
, FW3_FLAG_SNAT
, ra
, NULL
);
501 fw3_ipt_rule_append(r
, "zone_%s_postrouting", redir
->dest
.name
);
504 case FW3_TABLE_FILTER
:
505 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, ia
, &redir
->ip_redir
);
506 fw3_ipt_rule_sport_dport(r
, NULL
, &redir
->port_redir
);
507 fw3_ipt_rule_time(r
, &redir
->time
);
508 set_comment(r
, redir
->name
, num
, true);
509 fw3_ipt_rule_target(r
, "zone_%s_dest_ACCEPT", redir
->dest
.name
);
510 fw3_ipt_rule_append(r
, "zone_%s_forward", redir
->dest
.name
);
519 expand_redirect(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
520 struct fw3_redirect
*redir
, int num
)
522 struct list_head
*ext_addrs
, *int_addrs
;
523 struct fw3_address
*ext_addr
, *int_addr
, ref_addr
;
524 struct fw3_protocol
*proto
;
528 info(" * Redirect '%s'", redir
->name
);
530 info(" * Redirect #%u", num
);
532 if (!fw3_is_family(redir
->_src
, handle
->family
) ||
533 !fw3_is_family(redir
->_dest
, handle
->family
))
535 info(" ! Skipping due to different family of zone");
539 if (!fw3_is_family(&redir
->ip_src
, handle
->family
) ||
540 !fw3_is_family(&redir
->ip_dest
, handle
->family
) ||
541 !fw3_is_family(&redir
->ip_redir
, handle
->family
))
543 if (!redir
->ip_src
.resolved
||
544 !redir
->ip_dest
.resolved
||
545 !redir
->ip_redir
.resolved
)
546 info(" ! Skipping due to different family of ip address");
553 if (!fw3_is_family(redir
->_ipset
, handle
->family
))
555 info(" ! Skipping due to different family in ipset");
559 if (!fw3_check_ipset(redir
->_ipset
))
561 info(" ! Skipping due to missing ipset '%s'",
562 redir
->_ipset
->external
?
563 redir
->_ipset
->external
: redir
->_ipset
->name
);
567 set(redir
->_ipset
->flags
, handle
->family
, handle
->family
);
570 fw3_foreach(proto
, &redir
->proto
)
571 fw3_foreach(mac
, &redir
->mac_src
)
572 print_redirect(handle
, state
, redir
, num
, proto
, mac
);
574 /* reflection rules */
575 if (redir
->target
!= FW3_FLAG_DNAT
|| !redir
->reflection
)
578 if (!redir
->_dest
|| !redir
->_src
->masq
)
581 ext_addrs
= fw3_resolve_zone_addresses(redir
->_src
);
582 int_addrs
= fw3_resolve_zone_addresses(redir
->_dest
);
584 if (!ext_addrs
|| !int_addrs
)
587 list_for_each_entry(ext_addr
, ext_addrs
, list
)
589 if (!fw3_is_family(ext_addr
, handle
->family
))
592 list_for_each_entry(int_addr
, int_addrs
, list
)
594 if (!fw3_is_family(int_addr
, handle
->family
))
597 fw3_foreach(proto
, &redir
->proto
)
599 if (!proto
|| (proto
->protocol
!= 6 && proto
->protocol
!= 17))
602 if (redir
->reflection_src
== FW3_REFLECTION_INTERNAL
)
603 ref_addr
= *int_addr
;
605 ref_addr
= *ext_addr
;
610 print_reflection(handle
, state
, redir
, num
, proto
,
611 &ref_addr
, int_addr
, ext_addr
);
617 fw3_free_list(ext_addrs
);
618 fw3_free_list(int_addrs
);
622 fw3_print_redirects(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
)
625 struct fw3_redirect
*redir
;
627 if (handle
->family
== FW3_FAMILY_V6
)
630 if (handle
->table
!= FW3_TABLE_FILTER
&& handle
->table
!= FW3_TABLE_NAT
)
633 list_for_each_entry(redir
, &state
->redirects
, list
)
634 expand_redirect(handle
, state
, redir
, num
++);