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", address
, 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", address
, redirect
, ip_dest
),
40 FW3_OPT("src_dport", port
, redirect
, port_dest
),
42 FW3_OPT("dest_ip", address
, 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 fw3_load_redirects(struct fw3_state
*state
, struct uci_package
*p
)
115 struct uci_section
*s
;
116 struct uci_element
*e
;
117 struct fw3_redirect
*redir
;
121 INIT_LIST_HEAD(&state
->redirects
);
123 uci_foreach_element(&p
->sections
, e
)
125 s
= uci_to_section(e
);
127 if (strcmp(s
->type
, "redirect"))
130 redir
= malloc(sizeof(*redir
));
135 memset(redir
, 0, sizeof(*redir
));
137 INIT_LIST_HEAD(&redir
->proto
);
138 INIT_LIST_HEAD(&redir
->mac_src
);
140 redir
->enabled
= true;
141 redir
->reflection
= true;
145 fw3_parse_options(redir
, fw3_redirect_opts
, s
);
149 fw3_free_redirect(redir
);
153 if (redir
->src
.invert
)
155 warn_elem(e
, "must not have an inverted source");
156 fw3_free_redirect(redir
);
159 else if (redir
->src
.set
&& !redir
->src
.any
&&
160 !(redir
->_src
= fw3_lookup_zone(state
, redir
->src
.name
)))
162 warn_elem(e
, "refers to not existing zone '%s'", redir
->src
.name
);
163 fw3_free_redirect(redir
);
166 else if (redir
->dest
.set
&& !redir
->dest
.any
&&
167 !(redir
->_dest
= fw3_lookup_zone(state
, redir
->dest
.name
)))
169 warn_elem(e
, "refers to not existing zone '%s'", redir
->dest
.name
);
170 fw3_free_redirect(redir
);
173 else if (redir
->ipset
.set
&& state
->disable_ipsets
)
175 warn_elem(e
, "skipped due to disabled ipset support");
176 fw3_free_redirect(redir
);
179 else if (redir
->ipset
.set
&& !redir
->ipset
.any
&&
180 !(redir
->_ipset
= fw3_lookup_ipset(state
, redir
->ipset
.name
)))
182 warn_elem(e
, "refers to unknown ipset '%s'", redir
->ipset
.name
);
183 fw3_free_redirect(redir
);
187 if (!check_families(e
, redir
))
189 fw3_free_redirect(redir
);
193 if (redir
->target
== FW3_FLAG_UNSPEC
)
195 warn_elem(e
, "has no target specified, defaulting to DNAT");
196 redir
->target
= FW3_FLAG_DNAT
;
198 else if (redir
->target
< FW3_FLAG_DNAT
)
200 warn_elem(e
, "has invalid target specified, defaulting to DNAT");
201 redir
->target
= FW3_FLAG_DNAT
;
204 if (redir
->target
== FW3_FLAG_DNAT
)
207 warn_elem(e
, "must not have source '*' for DNAT target");
208 else if (!redir
->_src
)
209 warn_elem(e
, "has no source specified");
212 set(redir
->_src
->flags
, FW3_FAMILY_V4
, redir
->target
);
213 redir
->_src
->conntrack
= true;
217 if (redir
->reflection
&& redir
->_dest
&& redir
->_src
->masq
)
219 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_ACCEPT
);
220 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_DNAT
);
221 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_SNAT
);
227 warn_elem(e
, "must not have destination '*' for SNAT target");
228 else if (!redir
->_dest
)
229 warn_elem(e
, "has no destination specified");
230 else if (!redir
->ip_dest
.set
)
231 warn_elem(e
, "has no src_dip option specified");
232 else if (!list_empty(&redir
->mac_src
))
233 warn_elem(e
, "must not use 'src_mac' option for SNAT target");
236 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, redir
->target
);
237 redir
->_dest
->conntrack
= true;
242 if (list_empty(&redir
->proto
))
244 warn_elem(e
, "does not specify a protocol, assuming TCP+UDP");
245 fw3_parse_protocol(&redir
->proto
, "tcpudp", true);
250 fw3_free_redirect(redir
);
254 if (!redir
->port_redir
.set
)
255 redir
->port_redir
= redir
->port_dest
;
257 list_add_tail(&redir
->list
, &state
->redirects
);
262 append_chain_nat(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
264 if (redir
->target
== FW3_FLAG_DNAT
)
265 fw3_ipt_rule_append(r
, "zone_%s_prerouting", redir
->src
.name
);
267 fw3_ipt_rule_append(r
, "zone_%s_postrouting", redir
->dest
.name
);
271 set_snat_dnat(struct fw3_ipt_rule
*r
, enum fw3_flag target
,
272 struct fw3_address
*addr
, struct fw3_port
*port
)
274 char buf
[sizeof("255.255.255.255:65535-65535\0")];
278 if (addr
&& addr
->set
)
280 inet_ntop(AF_INET
, &addr
->address
.v4
, buf
, sizeof(buf
));
283 if (port
&& port
->set
)
285 if (port
->port_min
== port
->port_max
)
286 sprintf(buf
+ strlen(buf
), ":%u", port
->port_min
);
288 sprintf(buf
+ strlen(buf
), ":%u-%u",
289 port
->port_min
, port
->port_max
);
292 if (target
== FW3_FLAG_DNAT
)
294 fw3_ipt_rule_target(r
, "DNAT");
295 fw3_ipt_rule_addarg(r
, false, "--to-destination", buf
);
299 fw3_ipt_rule_target(r
, "SNAT");
300 fw3_ipt_rule_addarg(r
, false, "--to-source", buf
);
305 set_target_nat(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
307 if (redir
->target
== FW3_FLAG_DNAT
)
308 set_snat_dnat(r
, redir
->target
, &redir
->ip_redir
, &redir
->port_redir
);
310 set_snat_dnat(r
, redir
->target
, &redir
->ip_dest
, &redir
->port_dest
);
314 append_chain_filter(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
316 if (redir
->target
== FW3_FLAG_DNAT
)
318 /* XXX: check for local ip */
319 if (!redir
->ip_redir
.set
)
320 fw3_ipt_rule_append(r
, "zone_%s_input", redir
->src
.name
);
322 fw3_ipt_rule_append(r
, "zone_%s_forward", redir
->src
.name
);
326 if (redir
->src
.set
&& !redir
->src
.any
)
327 fw3_ipt_rule_append(r
, "zone_%s_forward", redir
->src
.name
);
329 fw3_ipt_rule_append(r
, "delegate_forward");
334 set_target_filter(struct fw3_ipt_rule
*r
, struct fw3_redirect
*redir
)
336 /* XXX: check for local ip */
337 if (redir
->target
== FW3_FLAG_DNAT
&& !redir
->ip_redir
.set
)
338 fw3_ipt_rule_extra(r
, "-m conntrack --ctstate DNAT");
340 fw3_ipt_rule_target(r
, "ACCEPT");
344 set_comment(struct fw3_ipt_rule
*r
, const char *name
, int num
, bool ref
)
349 fw3_ipt_rule_comment(r
, "%s (reflection)", name
);
351 fw3_ipt_rule_comment(r
, name
);
356 fw3_ipt_rule_comment(r
, "@redirect[%u] (reflection)", num
);
358 fw3_ipt_rule_comment(r
, "@redirect[%u]", num
);
363 print_redirect(struct fw3_ipt_handle
*h
, struct fw3_state
*state
,
364 struct fw3_redirect
*redir
, int num
,
365 struct fw3_protocol
*proto
, struct fw3_mac
*mac
)
367 struct fw3_ipt_rule
*r
;
368 struct fw3_address
*src
, *dst
;
369 struct fw3_port
*spt
, *dpt
;
374 src
= &redir
->ip_src
;
375 dst
= &redir
->ip_dest
;
376 spt
= &redir
->port_src
;
377 dpt
= &redir
->port_dest
;
379 if (redir
->target
== FW3_FLAG_SNAT
)
381 dst
= &redir
->ip_redir
;
382 dpt
= &redir
->port_redir
;
385 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, src
, dst
);
386 fw3_ipt_rule_sport_dport(r
, spt
, dpt
);
387 fw3_ipt_rule_mac(r
, mac
);
388 fw3_ipt_rule_ipset(r
, redir
->_ipset
, redir
->ipset
.invert
);
389 fw3_ipt_rule_time(r
, &redir
->time
);
390 fw3_ipt_rule_mark(r
, &redir
->mark
);
391 set_target_nat(r
, redir
);
392 fw3_ipt_rule_extra(r
, redir
->extra
);
393 set_comment(r
, redir
->name
, num
, false);
394 append_chain_nat(r
, redir
);
397 case FW3_TABLE_FILTER
:
398 src
= &redir
->ip_src
;
399 dst
= &redir
->ip_redir
;
400 spt
= &redir
->port_src
;
401 dpt
= &redir
->port_redir
;
403 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, src
, dst
);
404 fw3_ipt_rule_sport_dport(r
, spt
, dpt
);
405 fw3_ipt_rule_mac(r
, mac
);
406 fw3_ipt_rule_ipset(r
, redir
->_ipset
, redir
->ipset
.invert
);
407 fw3_ipt_rule_time(r
, &redir
->time
);
408 fw3_ipt_rule_mark(r
, &redir
->mark
);
409 set_target_filter(r
, redir
);
410 fw3_ipt_rule_extra(r
, redir
->extra
);
411 set_comment(r
, redir
->name
, num
, false);
412 append_chain_filter(r
, redir
);
421 print_reflection(struct fw3_ipt_handle
*h
, struct fw3_state
*state
,
422 struct fw3_redirect
*redir
, int num
,
423 struct fw3_protocol
*proto
, struct fw3_address
*ra
,
424 struct fw3_address
*ia
, struct fw3_address
*ea
)
426 struct fw3_ipt_rule
*r
;
431 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, ia
, ea
);
432 fw3_ipt_rule_sport_dport(r
, NULL
, &redir
->port_dest
);
433 fw3_ipt_rule_time(r
, &redir
->time
);
434 set_comment(r
, redir
->name
, num
, true);
435 set_snat_dnat(r
, FW3_FLAG_DNAT
, &redir
->ip_redir
, &redir
->port_redir
);
436 fw3_ipt_rule_append(r
, "zone_%s_prerouting", redir
->dest
.name
);
438 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, ia
, &redir
->ip_redir
);
439 fw3_ipt_rule_sport_dport(r
, NULL
, &redir
->port_redir
);
440 fw3_ipt_rule_time(r
, &redir
->time
);
441 set_comment(r
, redir
->name
, num
, true);
442 set_snat_dnat(r
, FW3_FLAG_SNAT
, ra
, NULL
);
443 fw3_ipt_rule_append(r
, "zone_%s_postrouting", redir
->dest
.name
);
446 case FW3_TABLE_FILTER
:
447 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, ia
, &redir
->ip_redir
);
448 fw3_ipt_rule_sport_dport(r
, NULL
, &redir
->port_redir
);
449 fw3_ipt_rule_time(r
, &redir
->time
);
450 set_comment(r
, redir
->name
, num
, true);
451 fw3_ipt_rule_target(r
, "zone_%s_dest_ACCEPT", redir
->dest
.name
);
452 fw3_ipt_rule_append(r
, "zone_%s_forward", redir
->dest
.name
);
461 expand_redirect(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
462 struct fw3_redirect
*redir
, int num
)
464 struct list_head
*ext_addrs
, *int_addrs
;
465 struct fw3_address
*ext_addr
, *int_addr
, ref_addr
;
466 struct fw3_device
*ext_net
, *int_net
;
467 struct fw3_protocol
*proto
;
471 info(" * Redirect '%s'", redir
->name
);
473 info(" * Redirect #%u", num
);
475 if (!fw3_is_family(redir
->_src
, handle
->family
) ||
476 !fw3_is_family(redir
->_dest
, handle
->family
))
478 info(" ! Skipping due to different family of zone");
482 if (!fw3_is_family(&redir
->ip_src
, handle
->family
) ||
483 !fw3_is_family(&redir
->ip_dest
, handle
->family
) ||
484 !fw3_is_family(&redir
->ip_redir
, handle
->family
))
486 info(" ! Skipping due to different family of ip address");
492 if (!fw3_is_family(redir
->_ipset
, handle
->family
))
494 info(" ! Skipping due to different family in ipset");
498 if (!fw3_check_ipset(redir
->_ipset
))
500 info(" ! Skipping due to missing ipset '%s'",
501 redir
->_ipset
->external
?
502 redir
->_ipset
->external
: redir
->_ipset
->name
);
506 set(redir
->_ipset
->flags
, handle
->family
, handle
->family
);
509 fw3_foreach(proto
, &redir
->proto
)
510 fw3_foreach(mac
, &redir
->mac_src
)
511 print_redirect(handle
, state
, redir
, num
, proto
, mac
);
513 /* reflection rules */
514 if (redir
->target
!= FW3_FLAG_DNAT
|| !redir
->reflection
)
517 if (!redir
->_dest
|| !redir
->_src
->masq
)
520 list_for_each_entry(ext_net
, &redir
->_src
->networks
, list
)
522 ext_addrs
= fw3_ubus_address(ext_net
->name
);
524 if (!ext_addrs
|| list_empty(ext_addrs
))
527 list_for_each_entry(int_net
, &redir
->_dest
->networks
, list
)
529 int_addrs
= fw3_ubus_address(int_net
->name
);
531 if (!int_addrs
|| list_empty(int_addrs
))
534 fw3_foreach(ext_addr
, ext_addrs
)
535 fw3_foreach(int_addr
, int_addrs
)
536 fw3_foreach(proto
, &redir
->proto
)
538 if (!fw3_is_family(int_addr
, handle
->family
) ||
539 !fw3_is_family(ext_addr
, handle
->family
))
542 if (!proto
|| (proto
->protocol
!= 6 && proto
->protocol
!= 17))
545 if (redir
->reflection_src
== FW3_REFLECTION_INTERNAL
)
546 ref_addr
= *int_addr
;
548 ref_addr
= *ext_addr
;
553 print_reflection(handle
, state
, redir
, num
, proto
,
554 &ref_addr
, int_addr
, ext_addr
);
557 fw3_ubus_address_free(int_addrs
);
560 fw3_ubus_address_free(ext_addrs
);
565 fw3_print_redirects(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
)
568 struct fw3_redirect
*redir
;
570 if (handle
->family
== FW3_FAMILY_V6
)
573 if (handle
->table
!= FW3_TABLE_FILTER
&& handle
->table
!= FW3_TABLE_NAT
)
576 list_for_each_entry(redir
, &state
->redirects
, list
)
577 expand_redirect(handle
, state
, redir
, num
++);