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 static struct fw3_option redirect_opts
[] = {
23 FW3_OPT("name", string
, redirect
, name
),
24 FW3_OPT("family", family
, redirect
, family
),
26 FW3_OPT("src", device
, redirect
, src
),
27 FW3_OPT("dest", device
, redirect
, dest
),
29 FW3_OPT("ipset", device
, redirect
, ipset
),
31 FW3_LIST("proto", protocol
, redirect
, proto
),
33 FW3_OPT("src_ip", address
, redirect
, ip_src
),
34 FW3_LIST("src_mac", mac
, redirect
, mac_src
),
35 FW3_OPT("src_port", port
, redirect
, port_src
),
37 FW3_OPT("src_dip", address
, redirect
, ip_dest
),
38 FW3_OPT("src_dport", port
, redirect
, port_dest
),
40 FW3_OPT("dest_ip", address
, redirect
, ip_redir
),
41 FW3_OPT("dest_port", port
, redirect
, port_redir
),
43 FW3_OPT("extra", string
, redirect
, extra
),
45 FW3_OPT("reflection", bool, redirect
, reflection
),
47 FW3_OPT("target", target
, redirect
, target
),
52 fw3_load_redirects(struct fw3_state
*state
, struct uci_package
*p
)
54 struct uci_section
*s
;
55 struct uci_element
*e
;
56 struct fw3_redirect
*redir
;
60 INIT_LIST_HEAD(&state
->redirects
);
62 uci_foreach_element(&p
->sections
, e
)
64 s
= uci_to_section(e
);
66 if (strcmp(s
->type
, "redirect"))
69 redir
= malloc(sizeof(*redir
));
74 memset(redir
, 0, sizeof(*redir
));
76 INIT_LIST_HEAD(&redir
->proto
);
77 INIT_LIST_HEAD(&redir
->mac_src
);
79 redir
->reflection
= true;
81 fw3_parse_options(redir
, redirect_opts
, ARRAY_SIZE(redirect_opts
), s
);
83 if (redir
->src
.invert
)
85 warn_elem(e
, "must not have an inverted source");
86 fw3_free_redirect(redir
);
89 else if (redir
->src
.set
&& !redir
->src
.any
&&
90 !(redir
->_src
= fw3_lookup_zone(state
, redir
->src
.name
)))
92 warn_elem(e
, "refers to not existing zone '%s'", redir
->src
.name
);
93 fw3_free_redirect(redir
);
96 else if (redir
->dest
.set
&& !redir
->dest
.any
&&
97 !(redir
->_dest
= fw3_lookup_zone(state
, redir
->dest
.name
)))
99 warn_elem(e
, "refers to not existing zone '%s'", redir
->dest
.name
);
100 fw3_free_redirect(redir
);
103 else if (redir
->ipset
.set
&& state
->disable_ipsets
)
105 warn_elem(e
, "skipped due to disabled ipset support");
106 fw3_free_redirect(redir
);
109 else if (redir
->ipset
.set
&& !redir
->ipset
.any
&&
110 !(redir
->_ipset
= fw3_lookup_ipset(state
, redir
->ipset
.name
)))
112 warn_elem(e
, "refers to not declared ipset '%s'", redir
->ipset
.name
);
113 fw3_free_redirect(redir
);
117 if (redir
->target
== FW3_TARGET_UNSPEC
)
119 warn_elem(e
, "has no target specified, defaulting to DNAT");
120 redir
->target
= FW3_TARGET_DNAT
;
122 else if (redir
->target
< FW3_TARGET_DNAT
)
124 warn_elem(e
, "has invalid target specified, defaulting to DNAT");
125 redir
->target
= FW3_TARGET_DNAT
;
128 if (redir
->target
== FW3_TARGET_DNAT
)
131 warn_elem(e
, "must not have source '*' for DNAT target");
132 else if (!redir
->_src
)
133 warn_elem(e
, "has no source specified");
136 setbit(redir
->_src
->has_dest_target
, redir
->target
);
137 redir
->_src
->conntrack
= true;
141 if (redir
->reflection
&& redir
->_dest
&& redir
->_src
->masq
)
143 setbit(redir
->_dest
->has_dest_target
, FW3_TARGET_ACCEPT
);
144 setbit(redir
->_dest
->has_dest_target
, FW3_TARGET_DNAT
);
145 setbit(redir
->_dest
->has_dest_target
, FW3_TARGET_SNAT
);
151 warn_elem(e
, "must not have destination '*' for SNAT target");
152 else if (!redir
->_dest
)
153 warn_elem(e
, "has no destination specified");
154 else if (!redir
->ip_dest
.set
)
155 warn_elem(e
, "has no src_dip option specified");
158 setbit(redir
->_dest
->has_dest_target
, redir
->target
);
159 redir
->_dest
->conntrack
= true;
166 fw3_free_redirect(redir
);
170 if (!redir
->port_redir
.set
)
171 redir
->port_redir
= redir
->port_dest
;
173 list_add_tail(&redir
->list
, &state
->redirects
);
178 print_chain_nat(struct fw3_redirect
*redir
)
180 if (redir
->target
== FW3_TARGET_DNAT
)
181 fw3_pr("-A zone_%s_prerouting", redir
->src
.name
);
183 fw3_pr("-A zone_%s_postrouting", redir
->dest
.name
);
187 print_snat_dnat(enum fw3_target target
,
188 struct fw3_address
*addr
, struct fw3_port
*port
)
191 char s
[sizeof("255.255.255.255 ")];
193 if (target
== FW3_TARGET_DNAT
)
194 t
= "DNAT --to-destination";
196 t
= "SNAT --to-source";
198 inet_ntop(AF_INET
, &addr
->address
.v4
, s
, sizeof(s
));
200 fw3_pr(" -j %s %s", t
, s
);
202 if (port
&& port
->set
)
204 if (port
->port_min
== port
->port_max
)
205 fw3_pr(":%u", port
->port_min
);
207 fw3_pr(":%u-%u", port
->port_min
, port
->port_max
);
214 print_target_nat(struct fw3_redirect
*redir
)
216 if (redir
->target
== FW3_TARGET_DNAT
)
217 print_snat_dnat(redir
->target
, &redir
->ip_redir
, &redir
->port_redir
);
219 print_snat_dnat(redir
->target
, &redir
->ip_dest
, &redir
->port_dest
);
223 print_chain_filter(struct fw3_redirect
*redir
)
225 if (redir
->target
== FW3_TARGET_DNAT
)
227 /* XXX: check for local ip */
228 if (!redir
->ip_redir
.set
)
229 fw3_pr("-A zone_%s_input", redir
->src
.name
);
231 fw3_pr("-A zone_%s_forward", redir
->src
.name
);
235 if (redir
->src
.set
&& !redir
->src
.any
)
236 fw3_pr("-A zone_%s_forward", redir
->src
.name
);
238 fw3_pr("-A delegate_forward");
243 print_target_filter(struct fw3_redirect
*redir
)
245 /* XXX: check for local ip */
246 if (redir
->target
== FW3_TARGET_DNAT
&& !redir
->ip_redir
.set
)
247 fw3_pr(" -m conntrack --ctstate DNAT -j ACCEPT\n");
249 fw3_pr(" -j ACCEPT\n");
253 print_redirect(enum fw3_table table
, enum fw3_family family
,
254 struct fw3_redirect
*redir
, int num
)
256 struct list_head
*ext_addrs
, *int_addrs
;
257 struct fw3_address
*ext_addr
, *int_addr
;
258 struct fw3_device
*ext_net
, *int_net
;
259 struct fw3_protocol
*proto
;
262 fw3_foreach(proto
, &redir
->proto
)
263 fw3_foreach(mac
, &redir
->mac_src
)
265 if (table
== FW3_TABLE_NAT
)
268 info(" * Redirect '%s'", redir
->name
);
270 info(" * Redirect #%u", num
);
272 print_chain_nat(redir
);
273 fw3_format_ipset(redir
->_ipset
, redir
->ipset
.invert
);
274 fw3_format_protocol(proto
, family
);
276 if (redir
->target
== FW3_TARGET_DNAT
)
278 fw3_format_src_dest(&redir
->ip_src
, &redir
->ip_dest
);
279 fw3_format_sport_dport(&redir
->port_src
, &redir
->port_dest
);
283 fw3_format_src_dest(&redir
->ip_src
, &redir
->ip_redir
);
284 fw3_format_sport_dport(&redir
->port_src
, &redir
->port_redir
);
288 fw3_format_extra(redir
->extra
);
289 fw3_format_comment(redir
->name
);
290 print_target_nat(redir
);
292 else if (table
== FW3_TABLE_FILTER
)
295 info(" * Redirect '%s'", redir
->name
);
297 info(" * Redirect #%u", num
);
299 print_chain_filter(redir
);
300 fw3_format_ipset(redir
->_ipset
, redir
->ipset
.invert
);
301 fw3_format_protocol(proto
, family
);
302 fw3_format_src_dest(&redir
->ip_src
, &redir
->ip_redir
);
303 fw3_format_sport_dport(&redir
->port_src
, &redir
->port_redir
);
305 fw3_format_extra(redir
->extra
);
306 fw3_format_comment(redir
->name
);
307 print_target_filter(redir
);
311 /* reflection rules */
312 if (redir
->target
!= FW3_TARGET_DNAT
|| !redir
->reflection
)
315 if (!redir
->_dest
|| !redir
->_src
->masq
)
318 list_for_each_entry(ext_net
, &redir
->_src
->networks
, list
)
320 ext_addrs
= fw3_ubus_address(ext_net
->name
);
322 if (!ext_addrs
|| list_empty(ext_addrs
))
325 list_for_each_entry(int_net
, &redir
->_dest
->networks
, list
)
327 int_addrs
= fw3_ubus_address(int_net
->name
);
329 if (!int_addrs
|| list_empty(int_addrs
))
332 fw3_foreach(ext_addr
, ext_addrs
)
333 fw3_foreach(int_addr
, int_addrs
)
334 fw3_foreach(proto
, &redir
->proto
)
336 if (!fw3_is_family(int_addr
, family
) ||
337 !fw3_is_family(ext_addr
, family
))
340 if (!proto
|| (proto
->protocol
!= 6 && proto
->protocol
!= 17))
345 if (table
== FW3_TABLE_NAT
)
347 fw3_pr("-A zone_%s_prerouting", redir
->dest
.name
);
348 fw3_format_protocol(proto
, family
);
349 fw3_format_src_dest(int_addr
, ext_addr
);
350 fw3_format_sport_dport(NULL
, &redir
->port_dest
);
351 fw3_format_comment(redir
->name
, " (reflection)");
352 print_snat_dnat(FW3_TARGET_DNAT
,
353 &redir
->ip_redir
, &redir
->port_redir
);
355 fw3_pr("-A zone_%s_postrouting", redir
->dest
.name
);
356 fw3_format_protocol(proto
, family
);
357 fw3_format_src_dest(int_addr
, &redir
->ip_redir
);
358 fw3_format_sport_dport(NULL
, &redir
->port_redir
);
359 fw3_format_comment(redir
->name
, " (reflection)");
360 print_snat_dnat(FW3_TARGET_SNAT
, ext_addr
, NULL
);
362 else if (table
== FW3_TABLE_FILTER
)
364 fw3_pr("-A zone_%s_forward", redir
->dest
.name
);
365 fw3_format_protocol(proto
, family
);
366 fw3_format_src_dest(int_addr
, &redir
->ip_redir
);
367 fw3_format_sport_dport(NULL
, &redir
->port_redir
);
368 fw3_format_comment(redir
->name
, " (reflection)");
369 fw3_pr(" -j zone_%s_dest_ACCEPT\n", redir
->dest
.name
);
373 fw3_ubus_address_free(int_addrs
);
376 fw3_ubus_address_free(ext_addrs
);
381 fw3_print_redirects(enum fw3_table table
, enum fw3_family family
,
382 struct fw3_state
*state
)
385 struct fw3_redirect
*redir
;
387 if (family
== FW3_FAMILY_V6
)
390 list_for_each_entry(redir
, &state
->redirects
, list
)
391 print_redirect(table
, family
, redir
, num
++);
395 fw3_free_redirect(struct fw3_redirect
*redir
)
397 fw3_free_list(&redir
->proto
);
398 fw3_free_list(&redir
->mac_src
);