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("reflection", bool, redirect
, reflection
),
56 FW3_OPT("reflection_src", reflection_source
,
57 redirect
, reflection_src
),
59 FW3_OPT("target", target
, redirect
, target
),
66 check_families(struct uci_element
*e
, struct fw3_redirect
*r
)
68 if (r
->family
== FW3_FAMILY_ANY
)
71 if (r
->_src
&& r
->_src
->family
&& r
->_src
->family
!= r
->family
)
73 warn_elem(e
, "refers to source zone with different family");
77 if (r
->_dest
&& r
->_dest
->family
&& r
->_dest
->family
!= r
->family
)
79 warn_elem(e
, "refers to destination zone with different family");
83 if (r
->_ipset
&& r
->_ipset
->family
&& r
->_ipset
->family
!= r
->family
)
85 warn_elem(e
, "refers to ipset with different family");
89 if (r
->ip_src
.family
&& r
->ip_src
.family
!= r
->family
)
91 warn_elem(e
, "uses source ip with different family");
95 if (r
->ip_dest
.family
&& r
->ip_dest
.family
!= r
->family
)
97 warn_elem(e
, "uses destination ip with different family");
101 if (r
->ip_redir
.family
&& r
->ip_redir
.family
!= r
->family
)
103 warn_elem(e
, "uses redirect ip with different family");
111 fw3_load_redirects(struct fw3_state
*state
, struct uci_package
*p
)
113 struct uci_section
*s
;
114 struct uci_element
*e
;
115 struct fw3_redirect
*redir
;
119 INIT_LIST_HEAD(&state
->redirects
);
121 uci_foreach_element(&p
->sections
, e
)
123 s
= uci_to_section(e
);
125 if (strcmp(s
->type
, "redirect"))
128 redir
= malloc(sizeof(*redir
));
133 memset(redir
, 0, sizeof(*redir
));
135 INIT_LIST_HEAD(&redir
->proto
);
136 INIT_LIST_HEAD(&redir
->mac_src
);
138 redir
->enabled
= true;
139 redir
->reflection
= true;
143 fw3_parse_options(redir
, fw3_redirect_opts
, s
);
147 fw3_free_redirect(redir
);
151 if (redir
->src
.invert
)
153 warn_elem(e
, "must not have an inverted source");
154 fw3_free_redirect(redir
);
157 else if (redir
->src
.set
&& !redir
->src
.any
&&
158 !(redir
->_src
= fw3_lookup_zone(state
, redir
->src
.name
, false)))
160 warn_elem(e
, "refers to not existing zone '%s'", redir
->src
.name
);
161 fw3_free_redirect(redir
);
164 else if (redir
->dest
.set
&& !redir
->dest
.any
&&
165 !(redir
->_dest
= fw3_lookup_zone(state
, redir
->dest
.name
, false)))
167 warn_elem(e
, "refers to not existing zone '%s'", redir
->dest
.name
);
168 fw3_free_redirect(redir
);
171 else if (redir
->ipset
.set
&& state
->disable_ipsets
)
173 warn_elem(e
, "skipped due to disabled ipset support");
174 fw3_free_redirect(redir
);
177 else if (redir
->ipset
.set
&& !redir
->ipset
.any
&&
178 !(redir
->_ipset
= fw3_lookup_ipset(state
, redir
->ipset
.name
, false)))
180 warn_elem(e
, "refers to unknown ipset '%s'", redir
->ipset
.name
);
181 fw3_free_redirect(redir
);
185 if (!check_families(e
, redir
))
187 fw3_free_redirect(redir
);
191 if (redir
->target
== FW3_FLAG_UNSPEC
)
193 warn_elem(e
, "has no target specified, defaulting to DNAT");
194 redir
->target
= FW3_FLAG_DNAT
;
196 else if (redir
->target
< FW3_FLAG_DNAT
)
198 warn_elem(e
, "has invalid target specified, defaulting to DNAT");
199 redir
->target
= FW3_FLAG_DNAT
;
202 if (redir
->target
== FW3_FLAG_DNAT
)
205 warn_elem(e
, "must not have source '*' for DNAT target");
206 else if (!redir
->_src
)
207 warn_elem(e
, "has no source specified");
210 set(redir
->_src
->flags
, FW3_FAMILY_V4
, redir
->target
);
211 redir
->_src
->conntrack
= true;
215 if (redir
->reflection
&& redir
->_dest
&& redir
->_src
->masq
)
217 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_ACCEPT
);
218 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_DNAT
);
219 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, FW3_FLAG_SNAT
);
225 warn_elem(e
, "must not have destination '*' for SNAT target");
226 else if (!redir
->_dest
)
227 warn_elem(e
, "has no destination specified");
228 else if (!redir
->ip_dest
.set
)
229 warn_elem(e
, "has no src_dip option specified");
230 else if (!list_empty(&redir
->mac_src
))
231 warn_elem(e
, "must not use 'src_mac' option for SNAT target");
234 set(redir
->_dest
->flags
, FW3_FAMILY_V4
, redir
->target
);
235 redir
->_dest
->conntrack
= true;
240 if (list_empty(&redir
->proto
))
242 warn_elem(e
, "does not specify a protocol, assuming TCP+UDP");
243 fw3_parse_protocol(&redir
->proto
, "tcpudp", true);
248 fw3_free_redirect(redir
);
252 if (!redir
->port_redir
.set
)
253 redir
->port_redir
= redir
->port_dest
;
255 list_add_tail(&redir
->list
, &state
->redirects
);
260 print_chain_nat(struct fw3_redirect
*redir
)
262 if (redir
->target
== FW3_FLAG_DNAT
)
263 fw3_pr("-A zone_%s_prerouting", redir
->src
.name
);
265 fw3_pr("-A zone_%s_postrouting", redir
->dest
.name
);
269 print_snat_dnat(enum fw3_flag target
,
270 struct fw3_address
*addr
, struct fw3_port
*port
)
272 char s
[sizeof("255.255.255.255 ")];
274 if (target
== FW3_FLAG_DNAT
)
275 fw3_pr(" -j DNAT --to-destination ");
277 fw3_pr(" -j SNAT --to-source ");
279 if (addr
&& addr
->set
)
281 inet_ntop(AF_INET
, &addr
->address
.v4
, s
, sizeof(s
));
285 if (port
&& port
->set
)
287 if (port
->port_min
== port
->port_max
)
288 fw3_pr(":%u", port
->port_min
);
290 fw3_pr(":%u-%u", port
->port_min
, port
->port_max
);
297 print_target_nat(struct fw3_redirect
*redir
)
299 if (redir
->target
== FW3_FLAG_DNAT
)
300 print_snat_dnat(redir
->target
, &redir
->ip_redir
, &redir
->port_redir
);
302 print_snat_dnat(redir
->target
, &redir
->ip_dest
, &redir
->port_dest
);
306 print_chain_filter(struct fw3_redirect
*redir
)
308 if (redir
->target
== FW3_FLAG_DNAT
)
310 /* XXX: check for local ip */
311 if (!redir
->ip_redir
.set
)
312 fw3_pr("-A zone_%s_input", redir
->src
.name
);
314 fw3_pr("-A zone_%s_forward", redir
->src
.name
);
318 if (redir
->src
.set
&& !redir
->src
.any
)
319 fw3_pr("-A zone_%s_forward", redir
->src
.name
);
321 fw3_pr("-A delegate_forward");
326 print_target_filter(struct fw3_redirect
*redir
)
328 /* XXX: check for local ip */
329 if (redir
->target
== FW3_FLAG_DNAT
&& !redir
->ip_redir
.set
)
330 fw3_pr(" -m conntrack --ctstate DNAT -j ACCEPT\n");
332 fw3_pr(" -j ACCEPT\n");
336 print_redirect(struct fw3_state
*state
, enum fw3_family family
,
337 enum fw3_table table
, struct fw3_redirect
*redir
, int num
)
339 struct list_head
*ext_addrs
, *int_addrs
;
340 struct fw3_address
*ext_addr
, *int_addr
, ref_addr
;
341 struct fw3_device
*ext_net
, *int_net
;
342 struct fw3_protocol
*proto
;
346 info(" * Redirect '%s'", redir
->name
);
348 info(" * Redirect #%u", num
);
350 if (!fw3_is_family(redir
->_src
, family
) ||
351 !fw3_is_family(redir
->_dest
, family
))
353 info(" ! Skipping due to different family of zone");
357 if (!fw3_is_family(&redir
->ip_src
, family
) ||
358 !fw3_is_family(&redir
->ip_dest
, family
) ||
359 !fw3_is_family(&redir
->ip_redir
, family
))
361 info(" ! Skipping due to different family of ip address");
367 if (!fw3_is_family(redir
->_ipset
, family
))
369 info(" ! Skipping due to different family in ipset");
373 set(redir
->_ipset
->flags
, family
, family
);
376 fw3_foreach(proto
, &redir
->proto
)
377 fw3_foreach(mac
, &redir
->mac_src
)
379 if (table
== FW3_TABLE_NAT
)
381 print_chain_nat(redir
);
382 fw3_format_ipset(redir
->_ipset
, redir
->ipset
.invert
);
383 fw3_format_protocol(proto
, family
);
385 if (redir
->target
== FW3_FLAG_DNAT
)
387 fw3_format_src_dest(&redir
->ip_src
, &redir
->ip_dest
);
388 fw3_format_sport_dport(&redir
->port_src
, &redir
->port_dest
);
392 fw3_format_src_dest(&redir
->ip_src
, &redir
->ip_redir
);
393 fw3_format_sport_dport(&redir
->port_src
, &redir
->port_redir
);
397 fw3_format_time(&redir
->time
);
398 fw3_format_extra(redir
->extra
);
399 fw3_format_comment(redir
->name
);
400 print_target_nat(redir
);
402 else if (table
== FW3_TABLE_FILTER
)
404 print_chain_filter(redir
);
405 fw3_format_ipset(redir
->_ipset
, redir
->ipset
.invert
);
406 fw3_format_protocol(proto
, family
);
407 fw3_format_src_dest(&redir
->ip_src
, &redir
->ip_redir
);
408 fw3_format_sport_dport(&redir
->port_src
, &redir
->port_redir
);
410 fw3_format_time(&redir
->time
);
411 fw3_format_extra(redir
->extra
);
412 fw3_format_comment(redir
->name
);
413 print_target_filter(redir
);
417 /* reflection rules */
418 if (redir
->target
!= FW3_FLAG_DNAT
|| !redir
->reflection
)
421 if (!redir
->_dest
|| !redir
->_src
->masq
)
424 list_for_each_entry(ext_net
, &redir
->_src
->networks
, list
)
426 ext_addrs
= fw3_ubus_address(ext_net
->name
);
428 if (!ext_addrs
|| list_empty(ext_addrs
))
431 list_for_each_entry(int_net
, &redir
->_dest
->networks
, list
)
433 int_addrs
= fw3_ubus_address(int_net
->name
);
435 if (!int_addrs
|| list_empty(int_addrs
))
438 fw3_foreach(ext_addr
, ext_addrs
)
439 fw3_foreach(int_addr
, int_addrs
)
440 fw3_foreach(proto
, &redir
->proto
)
442 if (!fw3_is_family(int_addr
, family
) ||
443 !fw3_is_family(ext_addr
, family
))
446 if (!proto
|| (proto
->protocol
!= 6 && proto
->protocol
!= 17))
449 if (redir
->reflection_src
== FW3_REFLECTION_INTERNAL
)
450 ref_addr
= *int_addr
;
452 ref_addr
= *ext_addr
;
457 if (table
== FW3_TABLE_NAT
)
459 fw3_pr("-A zone_%s_prerouting", redir
->dest
.name
);
460 fw3_format_protocol(proto
, family
);
461 fw3_format_src_dest(int_addr
, ext_addr
);
462 fw3_format_sport_dport(NULL
, &redir
->port_dest
);
463 fw3_format_time(&redir
->time
);
464 fw3_format_comment(redir
->name
, " (reflection)");
465 print_snat_dnat(FW3_FLAG_DNAT
,
466 &redir
->ip_redir
, &redir
->port_redir
);
468 fw3_pr("-A zone_%s_postrouting", redir
->dest
.name
);
469 fw3_format_protocol(proto
, family
);
470 fw3_format_src_dest(int_addr
, &redir
->ip_redir
);
471 fw3_format_sport_dport(NULL
, &redir
->port_redir
);
472 fw3_format_time(&redir
->time
);
473 fw3_format_comment(redir
->name
, " (reflection)");
474 print_snat_dnat(FW3_FLAG_SNAT
, &ref_addr
, NULL
);
476 else if (table
== FW3_TABLE_FILTER
)
478 fw3_pr("-A zone_%s_forward", redir
->dest
.name
);
479 fw3_format_protocol(proto
, family
);
480 fw3_format_src_dest(int_addr
, &redir
->ip_redir
);
481 fw3_format_sport_dport(NULL
, &redir
->port_redir
);
482 fw3_format_time(&redir
->time
);
483 fw3_format_comment(redir
->name
, " (reflection)");
484 fw3_pr(" -j zone_%s_dest_ACCEPT\n", redir
->dest
.name
);
488 fw3_ubus_address_free(int_addrs
);
491 fw3_ubus_address_free(ext_addrs
);
496 fw3_print_redirects(struct fw3_state
*state
, enum fw3_family family
,
497 enum fw3_table table
)
500 struct fw3_redirect
*redir
;
502 if (family
== FW3_FAMILY_V6
)
505 if (table
!= FW3_TABLE_FILTER
&& table
!= FW3_TABLE_NAT
)
508 list_for_each_entry(redir
, &state
->redirects
, list
)
509 print_redirect(state
, family
, table
, redir
, num
++);