2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2013-2018 Jo-Philipp Wich <jo@mein.io>
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
),
32 FW3_OPT("helper", cthelper
, redirect
, helper
),
34 FW3_LIST("proto", protocol
, redirect
, proto
),
36 FW3_OPT("src_ip", network
, redirect
, ip_src
),
37 FW3_LIST("src_mac", mac
, redirect
, mac_src
),
38 FW3_OPT("src_port", port
, redirect
, port_src
),
40 FW3_OPT("src_dip", network
, redirect
, ip_dest
),
41 FW3_OPT("src_dport", port
, redirect
, port_dest
),
43 FW3_OPT("dest_ip", network
, redirect
, ip_redir
),
44 FW3_OPT("dest_port", port
, redirect
, port_redir
),
46 FW3_OPT("extra", string
, redirect
, extra
),
48 FW3_OPT("limit", limit
, redirect
, limit
),
49 FW3_OPT("limit_burst", int, redirect
, limit
.burst
),
51 FW3_OPT("utc_time", bool, redirect
, time
.utc
),
52 FW3_OPT("start_date", date
, redirect
, time
.datestart
),
53 FW3_OPT("stop_date", date
, redirect
, time
.datestop
),
54 FW3_OPT("start_time", time
, redirect
, time
.timestart
),
55 FW3_OPT("stop_time", time
, redirect
, time
.timestop
),
56 FW3_OPT("weekdays", weekdays
, redirect
, time
.weekdays
),
57 FW3_OPT("monthdays", monthdays
, redirect
, time
.monthdays
),
59 FW3_OPT("mark", mark
, redirect
, mark
),
61 FW3_OPT("reflection", bool, redirect
, reflection
),
62 FW3_OPT("reflection_src", reflection_source
,
63 redirect
, reflection_src
),
65 FW3_OPT("target", target
, redirect
, target
),
72 check_families(struct uci_element
*e
, struct fw3_redirect
*r
)
74 if (r
->family
== FW3_FAMILY_ANY
)
77 if (r
->_src
&& r
->_src
->family
&& r
->_src
->family
!= r
->family
)
79 warn_elem(e
, "refers to source zone with different family");
83 if (r
->_dest
&& r
->_dest
->family
&& r
->_dest
->family
!= r
->family
)
85 warn_elem(e
, "refers to destination zone with different family");
89 if (r
->ipset
.ptr
&& r
->ipset
.ptr
->family
&&
90 r
->ipset
.ptr
->family
!= r
->family
)
92 warn_elem(e
, "refers to ipset with different family");
96 if (r
->helper
.ptr
&& r
->helper
.ptr
->family
&&
97 r
->helper
.ptr
->family
!= r
->family
)
99 warn_elem(e
, "refers to CT helper not supporting family");
103 if (r
->ip_src
.family
&& r
->ip_src
.family
!= r
->family
)
105 warn_elem(e
, "uses source ip with different family");
109 if (r
->ip_dest
.family
&& r
->ip_dest
.family
!= r
->family
)
111 warn_elem(e
, "uses destination ip with different family");
115 if (r
->ip_redir
.family
&& r
->ip_redir
.family
!= r
->family
)
117 warn_elem(e
, "uses redirect ip with different family");
125 compare_addr(struct fw3_address
*a
, struct fw3_address
*b
)
127 if (a
->family
!= FW3_FAMILY_V4
|| b
->family
!= FW3_FAMILY_V4
)
130 return ((a
->address
.v4
.s_addr
& a
->mask
.v4
.s_addr
) ==
131 (b
->address
.v4
.s_addr
& a
->mask
.v4
.s_addr
));
135 resolve_dest(struct uci_element
*e
, struct fw3_redirect
*redir
,
136 struct fw3_state
*state
)
138 struct fw3_zone
*zone
;
139 struct fw3_address
*addr
;
140 struct list_head
*addrs
;
142 if (!redir
->ip_redir
.set
)
145 list_for_each_entry(zone
, &state
->zones
, list
)
147 addrs
= fw3_resolve_zone_addresses(zone
, NULL
);
152 list_for_each_entry(addr
, addrs
, list
)
154 if (!compare_addr(addr
, &redir
->ip_redir
))
157 strncpy(redir
->dest
.name
, zone
->name
, sizeof(redir
->dest
.name
) - 1);
158 redir
->dest
.set
= true;
164 fw3_free_list(addrs
);
174 check_local(struct uci_element
*e
, struct fw3_redirect
*redir
,
175 struct fw3_state
*state
)
177 if (redir
->target
!= FW3_FLAG_DNAT
)
180 if (!redir
->ip_redir
.set
)
187 select_helper(struct fw3_state
*state
, struct fw3_redirect
*redir
)
189 struct fw3_protocol
*proto
;
190 struct fw3_cthelper
*helper
;
193 if (!state
->defaults
.auto_helper
)
196 if (!redir
->_src
|| redir
->target
!= FW3_FLAG_DNAT
)
199 if (!redir
->port_redir
.set
|| redir
->port_redir
.invert
)
202 if (redir
->helper
.set
|| redir
->helper
.ptr
)
205 if (list_empty(&redir
->proto
))
208 list_for_each_entry(proto
, &redir
->proto
, list
)
210 helper
= fw3_lookup_cthelper_by_proto_port(state
, proto
, &redir
->port_redir
);
219 /* store pointer to auto-selected helper but set ".set" flag to false,
220 * to allow later code to decide between configured or auto-selected
222 redir
->helper
.set
= false;
223 redir
->helper
.ptr
= helper
;
225 set(redir
->_src
->flags
, FW3_FAMILY_V4
, FW3_FLAG_HELPER
);
229 check_redirect(struct fw3_state
*state
, struct fw3_redirect
*redir
, struct uci_element
*e
)
236 if (redir
->src
.invert
)
238 warn_section("redirect", redir
, e
, "must not have an inverted source");
241 else if (redir
->src
.set
&& !redir
->src
.any
&&
242 !(redir
->_src
= fw3_lookup_zone(state
, redir
->src
.name
)))
244 warn_section("redirect", redir
, e
, "refers to not existing zone '%s'",
248 else if (redir
->dest
.set
&& !redir
->dest
.any
&&
249 !(redir
->_dest
= fw3_lookup_zone(state
, redir
->dest
.name
)))
251 warn_section("redirect", redir
, e
, "refers to not existing zone '%s'",
255 else if (redir
->ipset
.set
&& state
->disable_ipsets
)
257 warn_section("redirect", redir
, e
, "skipped due to disabled ipset support");
260 else if (redir
->ipset
.set
&&
261 !(redir
->ipset
.ptr
= fw3_lookup_ipset(state
, redir
->ipset
.name
)))
263 warn_section("redirect", redir
, e
, "refers to unknown ipset '%s'",
267 else if (redir
->helper
.set
&&
268 !(redir
->helper
.ptr
= fw3_lookup_cthelper(state
, redir
->helper
.name
)))
270 warn_section("redirect", redir
, e
, "refers to unknown CT helper '%s'",
275 if (!check_families(e
, redir
))
278 if (redir
->target
== FW3_FLAG_UNSPEC
)
280 warn_section("redirect", redir
, e
, "has no target specified, defaulting to DNAT");
281 redir
->target
= FW3_FLAG_DNAT
;
283 else if (redir
->target
< FW3_FLAG_DNAT
|| redir
->target
> FW3_FLAG_SNAT
)
285 warn_section("redirect", redir
, e
, "has invalid target specified, defaulting to DNAT");
286 redir
->target
= FW3_FLAG_DNAT
;
291 if (redir
->target
== FW3_FLAG_DNAT
)
294 warn_section("redirect", redir
, e
, "must not have source '*' for DNAT target");
295 else if (!redir
->_src
)
296 warn_section("redirect", redir
, e
, "has no source specified");
297 else if (redir
->helper
.invert
)
298 warn_section("redirect", redir
, e
, "must not use a negated helper match");
301 set(redir
->_src
->flags
, FW3_FAMILY_V4
, redir
->target
);
304 if (!check_local(e
, redir
, state
) && !redir
->dest
.set
&&
305 resolve_dest(e
, redir
, state
))
307 warn_section("redirect", redir
, e
,
308 "does not specify a destination, assuming '%s'",
312 if (redir
->reflection
&& redir
->_dest
&& redir
->_src
->masq
)
314 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_ACCEPT
);
315 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_DNAT
);
316 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_SNAT
);
319 if (redir
->helper
.ptr
)
320 set(redir
->_src
->flags
, FW3_FAMILY_V4
, FW3_FLAG_HELPER
);
326 warn_section("redirect", redir
, e
,
327 "must not have destination '*' for SNAT target");
328 else if (!redir
->_dest
)
329 warn_section("redirect", redir
, e
, "has no destination specified");
330 else if (!redir
->ip_dest
.set
)
331 warn_section("redirect", redir
, e
, "has no src_dip option specified");
332 else if (!list_empty(&redir
->mac_src
))
333 warn_section("redirect", redir
, e
, "must not use 'src_mac' option for SNAT target");
334 else if (redir
->helper
.set
)
335 warn_section("redirect", redir
, e
, "must not use 'helper' option for SNAT target");
338 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, redir
->target
);
343 if (list_empty(&redir
->proto
))
345 warn_section("redirect", redir
, e
, "does not specify a protocol, assuming TCP+UDP");
346 fw3_parse_protocol(&redir
->proto
, "tcpudp", true);
352 if (redir
->target
== FW3_FLAG_DNAT
&& !redir
->port_redir
.set
)
353 redir
->port_redir
= redir
->port_dest
;
358 static struct fw3_redirect
*
359 fw3_alloc_redirect(struct fw3_state
*state
)
361 struct fw3_redirect
*redir
;
363 redir
= calloc(1, sizeof(*redir
));
367 INIT_LIST_HEAD(&redir
->proto
);
368 INIT_LIST_HEAD(&redir
->mac_src
);
370 redir
->enabled
= true;
371 redir
->reflection
= true;
373 list_add_tail(&redir
->list
, &state
->redirects
);
379 fw3_load_redirects(struct fw3_state
*state
, struct uci_package
*p
,
382 struct uci_section
*s
;
383 struct uci_element
*e
;
384 struct fw3_redirect
*redir
;
385 struct blob_attr
*entry
;
388 INIT_LIST_HEAD(&state
->redirects
);
390 blob_for_each_attr(entry
, a
, rem
)
393 const char *name
= "ubus redirect";
395 if (!fw3_attr_parse_name_type(entry
, &name
, &type
))
398 if (strcmp(type
, "redirect"))
401 redir
= fw3_alloc_redirect(state
);
405 if (!fw3_parse_blob_options(redir
, fw3_redirect_opts
, entry
, name
))
407 warn_section("redirect", redir
, NULL
, "skipped due to invalid options");
408 fw3_free_redirect(redir
);
412 if (!check_redirect(state
, redir
, NULL
)) {
413 fw3_free_redirect(redir
);
417 select_helper(state
, redir
);
420 uci_foreach_element(&p
->sections
, e
)
422 s
= uci_to_section(e
);
424 if (strcmp(s
->type
, "redirect"))
427 redir
= fw3_alloc_redirect(state
);
431 if (!fw3_parse_options(redir
, fw3_redirect_opts
, s
))
433 warn_elem(e
, "skipped due to invalid options");
434 fw3_free_redirect(redir
);
438 if (!check_redirect(state
, redir
, e
)) {
439 fw3_free_redirect(redir
);
443 select_helper(state
, redir
);
448 append_chain_nat(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
450 if (redir
->target
== FW3_FLAG_DNAT
)
451 fw3_ipt_rule_append(r
, "zone_%s_prerouting", redir
->src
.name
);
453 fw3_ipt_rule_append(r
, "zone_%s_postrouting", redir
->dest
.name
);
457 set_redirect(struct fw3_ipt_rule
*r
, struct fw3_port
*port
)
459 char buf
[sizeof("65535-65535\0")];
461 fw3_ipt_rule_target(r
, "REDIRECT");
463 if (port
&& port
->set
)
465 if (port
->port_min
== port
->port_max
)
466 sprintf(buf
, "%u", port
->port_min
);
468 snprintf(buf
, sizeof(buf
), "%u-%u", port
->port_min
, port
->port_max
);
470 fw3_ipt_rule_addarg(r
, false, "--to-ports", buf
);
475 set_snat_dnat(struct fw3_ipt_rule
*r
, enum fw3_flag target
,
476 struct fw3_address
*addr
, struct fw3_port
*port
)
478 char buf
[sizeof("255.255.255.255:65535-65535\0")];
482 if (addr
&& addr
->set
)
484 inet_ntop(AF_INET
, &addr
->address
.v4
, buf
, sizeof(buf
));
487 if (port
&& port
->set
)
489 if (port
->port_min
== port
->port_max
)
490 sprintf(buf
+ strlen(buf
), ":%u", port
->port_min
);
492 sprintf(buf
+ strlen(buf
), ":%u-%u",
493 port
->port_min
, port
->port_max
);
496 if (target
== FW3_FLAG_DNAT
)
498 fw3_ipt_rule_target(r
, "DNAT");
499 fw3_ipt_rule_addarg(r
, false, "--to-destination", buf
);
503 fw3_ipt_rule_target(r
, "SNAT");
504 fw3_ipt_rule_addarg(r
, false, "--to-source", buf
);
509 set_target_nat(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
512 set_redirect(r
, &redir
->port_redir
);
513 else if (redir
->target
== FW3_FLAG_DNAT
)
514 set_snat_dnat(r
, redir
->target
, &redir
->ip_redir
, &redir
->port_redir
);
516 set_snat_dnat(r
, redir
->target
, &redir
->ip_dest
, &redir
->port_dest
);
520 set_comment(struct fw3_ipt_rule
*r
, const char *name
, int num
, const char *suffix
)
525 fw3_ipt_rule_comment(r
, "%s (%s)", name
, suffix
);
527 fw3_ipt_rule_comment(r
, name
);
532 fw3_ipt_rule_comment(r
, "@redirect[%u] (%s)", num
, suffix
);
534 fw3_ipt_rule_comment(r
, "@redirect[%u]", num
);
539 print_redirect(struct fw3_ipt_handle
*h
, struct fw3_state
*state
,
540 struct fw3_redirect
*redir
, int num
,
541 struct fw3_protocol
*proto
, struct fw3_mac
*mac
)
543 struct fw3_ipt_rule
*r
;
544 struct fw3_address
*src
, *dst
;
545 struct fw3_port
*spt
, *dpt
;
550 src
= &redir
->ip_src
;
551 dst
= &redir
->ip_dest
;
552 spt
= &redir
->port_src
;
553 dpt
= &redir
->port_dest
;
555 if (redir
->target
== FW3_FLAG_SNAT
)
557 dst
= &redir
->ip_redir
;
558 dpt
= &redir
->port_redir
;
561 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, src
, dst
);
562 fw3_ipt_rule_sport_dport(r
, spt
, dpt
);
563 fw3_ipt_rule_mac(r
, mac
);
564 fw3_ipt_rule_ipset(r
, &redir
->ipset
);
565 fw3_ipt_rule_helper(r
, &redir
->helper
);
566 fw3_ipt_rule_limit(r
, &redir
->limit
);
567 fw3_ipt_rule_time(r
, &redir
->time
);
568 fw3_ipt_rule_mark(r
, &redir
->mark
);
569 set_target_nat(r
, redir
);
570 fw3_ipt_rule_extra(r
, redir
->extra
);
571 set_comment(r
, redir
->name
, num
, NULL
);
572 append_chain_nat(r
, redir
);
576 if (redir
->target
== FW3_FLAG_DNAT
&& redir
->helper
.ptr
)
578 if (!fw3_cthelper_check_proto(redir
->helper
.ptr
, proto
))
580 info(" ! Skipping protocol %s since helper '%s' does not support it",
581 fw3_protoname(proto
), redir
->helper
.ptr
->name
);
585 if (!redir
->helper
.set
)
586 info(" - Auto-selected conntrack helper '%s' based on proto/port",
587 redir
->helper
.ptr
->name
);
589 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, &redir
->ip_src
, &redir
->ip_redir
);
590 fw3_ipt_rule_sport_dport(r
, &redir
->port_src
, &redir
->port_redir
);
591 fw3_ipt_rule_mac(r
, mac
);
592 fw3_ipt_rule_ipset(r
, &redir
->ipset
);
593 fw3_ipt_rule_limit(r
, &redir
->limit
);
594 fw3_ipt_rule_time(r
, &redir
->time
);
595 fw3_ipt_rule_mark(r
, &redir
->mark
);
596 fw3_ipt_rule_addarg(r
, false, "-m", "conntrack");
597 fw3_ipt_rule_addarg(r
, false, "--ctstate", "DNAT");
598 fw3_ipt_rule_target(r
, "CT");
599 fw3_ipt_rule_addarg(r
, false, "--helper", redir
->helper
.ptr
->name
);
600 set_comment(r
, redir
->name
, num
, "CT helper");
601 fw3_ipt_rule_append(r
, "zone_%s_helper", redir
->_src
->name
);
611 print_reflection(struct fw3_ipt_handle
*h
, struct fw3_state
*state
,
612 struct fw3_redirect
*redir
, int num
,
613 struct fw3_protocol
*proto
, struct fw3_address
*ra
,
614 struct fw3_address
*ia
, struct fw3_address
*ea
)
616 struct fw3_ipt_rule
*r
;
621 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, ia
, ea
);
622 fw3_ipt_rule_sport_dport(r
, NULL
, &redir
->port_dest
);
623 fw3_ipt_rule_limit(r
, &redir
->limit
);
624 fw3_ipt_rule_time(r
, &redir
->time
);
625 set_comment(r
, redir
->name
, num
, "reflection");
626 set_snat_dnat(r
, FW3_FLAG_DNAT
, &redir
->ip_redir
, &redir
->port_redir
);
627 fw3_ipt_rule_replace(r
, "zone_%s_prerouting", redir
->dest
.name
);
629 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, ia
, &redir
->ip_redir
);
630 fw3_ipt_rule_sport_dport(r
, NULL
, &redir
->port_redir
);
631 fw3_ipt_rule_limit(r
, &redir
->limit
);
632 fw3_ipt_rule_time(r
, &redir
->time
);
633 set_comment(r
, redir
->name
, num
, "reflection");
634 set_snat_dnat(r
, FW3_FLAG_SNAT
, ra
, NULL
);
635 fw3_ipt_rule_replace(r
, "zone_%s_postrouting", redir
->dest
.name
);
644 expand_redirect(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
645 struct fw3_redirect
*redir
, int num
)
647 struct list_head
*ext_addrs
, *int_addrs
;
648 struct fw3_address
*ext_addr
, *int_addr
, ref_addr
;
649 struct fw3_protocol
*proto
;
653 info(" * Redirect '%s'", redir
->name
);
655 info(" * Redirect #%u", num
);
657 if (!fw3_is_family(redir
->_src
, handle
->family
) ||
658 !fw3_is_family(redir
->_dest
, handle
->family
))
660 info(" ! Skipping due to different family of zone");
664 if (!fw3_is_family(&redir
->ip_src
, handle
->family
) ||
665 !fw3_is_family(&redir
->ip_dest
, handle
->family
) ||
666 !fw3_is_family(&redir
->ip_redir
, handle
->family
))
668 if (!redir
->ip_src
.resolved
||
669 !redir
->ip_dest
.resolved
||
670 !redir
->ip_redir
.resolved
)
671 info(" ! Skipping due to different family of ip address");
676 if (redir
->ipset
.ptr
)
678 if (!fw3_is_family(redir
->ipset
.ptr
, handle
->family
))
680 info(" ! Skipping due to different family in ipset");
684 if (!fw3_check_ipset(redir
->ipset
.ptr
))
686 info(" ! Skipping due to missing ipset '%s'",
687 redir
->ipset
.ptr
->external
?
688 redir
->ipset
.ptr
->external
: redir
->ipset
.ptr
->name
);
692 set(redir
->ipset
.ptr
->flags
, handle
->family
, handle
->family
);
695 fw3_foreach(proto
, &redir
->proto
)
696 fw3_foreach(mac
, &redir
->mac_src
)
697 print_redirect(handle
, state
, redir
, num
, proto
, mac
);
699 /* reflection rules */
700 if (redir
->target
!= FW3_FLAG_DNAT
|| !redir
->reflection
|| redir
->local
)
703 if (!redir
->_dest
|| !redir
->_src
->masq
)
706 ext_addrs
= fw3_resolve_zone_addresses(redir
->_src
, &redir
->ip_dest
);
707 int_addrs
= fw3_resolve_zone_addresses(redir
->_dest
, NULL
);
709 if (!ext_addrs
|| !int_addrs
)
712 list_for_each_entry(ext_addr
, ext_addrs
, list
)
714 if (!fw3_is_family(ext_addr
, handle
->family
))
717 list_for_each_entry(int_addr
, int_addrs
, list
)
719 if (!fw3_is_family(int_addr
, handle
->family
))
722 fw3_foreach(proto
, &redir
->proto
)
727 if (redir
->reflection_src
== FW3_REFLECTION_INTERNAL
)
728 ref_addr
= *int_addr
;
730 ref_addr
= *ext_addr
;
732 ref_addr
.mask
.v4
.s_addr
= 0xFFFFFFFF;
733 ext_addr
->mask
.v4
.s_addr
= 0xFFFFFFFF;
735 print_reflection(handle
, state
, redir
, num
, proto
,
736 &ref_addr
, int_addr
, ext_addr
);
742 fw3_free_list(ext_addrs
);
743 fw3_free_list(int_addrs
);
747 fw3_print_redirects(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
)
750 struct fw3_redirect
*redir
;
752 if (handle
->family
== FW3_FAMILY_V6
)
755 if (handle
->table
!= FW3_TABLE_FILTER
&&
756 handle
->table
!= FW3_TABLE_NAT
&&
757 handle
->table
!= FW3_TABLE_RAW
)
760 list_for_each_entry(redir
, &state
->redirects
, list
)
762 if (handle
->table
== FW3_TABLE_RAW
&& !redir
->helper
.ptr
)
765 expand_redirect(handle
, state
, redir
, num
++);