2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2014 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.
22 const struct fw3_option fw3_snat_opts
[] = {
23 FW3_OPT("enabled", bool, snat
, enabled
),
25 FW3_OPT("name", string
, snat
, name
),
26 FW3_OPT("family", family
, snat
, family
),
28 FW3_OPT("src", device
, snat
, src
),
29 FW3_OPT("device", string
, snat
, device
),
31 FW3_OPT("ipset", setmatch
, snat
, ipset
),
33 FW3_LIST("proto", protocol
, snat
, proto
),
35 FW3_OPT("src_ip", network
, snat
, ip_src
),
36 FW3_OPT("src_port", port
, snat
, port_src
),
38 FW3_OPT("snat_ip", network
, snat
, ip_snat
),
39 FW3_OPT("snat_port", port
, snat
, port_snat
),
41 FW3_OPT("dest_ip", network
, snat
, ip_dest
),
42 FW3_OPT("dest_port", port
, snat
, port_dest
),
44 FW3_OPT("extra", string
, snat
, extra
),
46 FW3_OPT("limit", limit
, snat
, limit
),
47 FW3_OPT("limit_burst", int, snat
, limit
.burst
),
49 FW3_OPT("connlimit_ports", bool, snat
, connlimit_ports
),
51 FW3_OPT("utc_time", bool, snat
, time
.utc
),
52 FW3_OPT("start_date", date
, snat
, time
.datestart
),
53 FW3_OPT("stop_date", date
, snat
, time
.datestop
),
54 FW3_OPT("start_time", time
, snat
, time
.timestart
),
55 FW3_OPT("stop_time", time
, snat
, time
.timestop
),
56 FW3_OPT("weekdays", weekdays
, snat
, time
.weekdays
),
57 FW3_OPT("monthdays", monthdays
, snat
, time
.monthdays
),
59 FW3_OPT("mark", mark
, snat
, mark
),
61 FW3_OPT("target", target
, snat
, target
),
68 check_families(struct uci_element
*e
, struct fw3_snat
*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
->ipset
.ptr
&& r
->ipset
.ptr
->family
&&
80 r
->ipset
.ptr
->family
!= r
->family
)
82 warn_elem(e
, "refers to ipset with different family");
86 if (r
->ip_src
.family
&& r
->ip_src
.family
!= r
->family
)
88 warn_elem(e
, "uses source ip with different family");
92 if (r
->ip_dest
.family
&& r
->ip_dest
.family
!= r
->family
)
94 warn_elem(e
, "uses destination ip with different family");
98 if (r
->ip_snat
.family
&& r
->ip_snat
.family
!= r
->family
)
100 warn_elem(e
, "uses snat ip with different family");
108 static struct fw3_snat
*
109 alloc_snat(struct fw3_state
*state
)
111 struct fw3_snat
*snat
= calloc(1, sizeof(*snat
));
114 INIT_LIST_HEAD(&snat
->proto
);
115 list_add_tail(&snat
->list
, &state
->snats
);
116 snat
->enabled
= true;
124 fw3_load_snats(struct fw3_state
*state
, struct uci_package
*p
, struct blob_attr
*a
)
126 struct uci_section
*s
;
127 struct uci_element
*e
;
128 struct fw3_snat
*snat
, *n
;
129 struct blob_attr
*entry
, *opt
;
132 INIT_LIST_HEAD(&state
->snats
);
134 blob_for_each_attr(entry
, a
, rem
) {
135 const char *type
= NULL
;
136 const char *name
= "ubus rule";
138 if (!fw3_attr_parse_name_type(entry
, &name
, &type
))
141 if (strcmp(type
, "nat"))
144 if (!(snat
= alloc_snat(state
)))
147 if (!fw3_parse_blob_options(snat
, fw3_snat_opts
, rule
, name
))
149 warn_section("nat", snat
, NULL
, "skipped due to invalid options");
155 uci_foreach_element(&p
->sections
, e
)
157 s
= uci_to_section(e
);
159 if (strcmp(s
->type
, "nat"))
162 if (!(snat
= alloc_snat(state
)))
165 if (!fw3_parse_options(snat
, fw3_snat_opts
, s
))
167 warn_elem(e
, "skipped due to invalid options");
173 list_for_each_entry_safe(snat
, n
, &state
->snats
, list
)
181 if (snat
->src
.invert
)
183 warn_elem(e
, "must not have an inverted source");
187 else if (snat
->src
.set
&& !snat
->src
.any
&&
188 !(snat
->_src
= fw3_lookup_zone(state
, snat
->src
.name
)))
190 warn_elem(e
, "refers to not existing zone '%s'", snat
->src
.name
);
194 else if (snat
->ipset
.set
&& state
->disable_ipsets
)
196 warn_elem(e
, "skipped due to disabled ipset support");
200 else if (snat
->ipset
.set
&&
201 !(snat
->ipset
.ptr
= fw3_lookup_ipset(state
, snat
->ipset
.name
)))
203 warn_elem(e
, "refers to unknown ipset '%s'", snat
->ipset
.name
);
208 if (!check_families(e
, snat
))
214 if (snat
->target
== FW3_FLAG_UNSPEC
)
216 warn_elem(e
, "has no target specified, defaulting to MASQUERADE");
217 snat
->target
= FW3_FLAG_MASQUERADE
;
219 else if (snat
->target
!= FW3_FLAG_ACCEPT
&& snat
->target
!= FW3_FLAG_SNAT
&&
220 snat
->target
!= FW3_FLAG_MASQUERADE
)
222 warn_elem(e
, "has invalid target specified, defaulting to MASQUERADE");
223 snat
->target
= FW3_FLAG_MASQUERADE
;
226 if (snat
->target
== FW3_FLAG_SNAT
&&
227 !snat
->ip_snat
.set
&& !snat
->port_snat
.set
)
229 warn_elem(e
, "needs either 'snat_ip' or 'snat_port' for SNAT");
233 else if (snat
->target
!= FW3_FLAG_SNAT
&& snat
->ip_snat
.set
)
235 warn_elem(e
, "must not use 'snat_ip' for non-SNAT");
239 else if (snat
->target
!= FW3_FLAG_SNAT
&& snat
->port_snat
.set
)
241 warn_elem(e
, "must not use 'snat_port' for non-SNAT");
246 if (list_empty(&snat
->proto
))
248 warn_elem(e
, "does not specify a protocol, assuming all");
249 fw3_parse_protocol(&snat
->proto
, "all", true);
253 set(snat
->_src
->flags
, FW3_FAMILY_V4
, FW3_FLAG_SNAT
);
258 append_chain(struct fw3_ipt_rule
*r
, struct fw3_snat
*snat
)
261 fw3_ipt_rule_append(r
, "zone_%s_postrouting", snat
->src
.name
);
263 fw3_ipt_rule_append(r
, "POSTROUTING");
267 set_target(struct fw3_ipt_rule
*r
, struct fw3_snat
*snat
,
268 struct fw3_protocol
*proto
)
270 char buf
[sizeof("255.255.255.255:65535-65535\0")];
272 if (snat
->target
== FW3_FLAG_SNAT
)
276 if (snat
->ip_snat
.set
)
278 inet_ntop(AF_INET
, &snat
->ip_snat
.address
.v4
, buf
, sizeof(buf
));
281 if (snat
->port_snat
.set
&& proto
&& !proto
->any
&&
282 (proto
->protocol
== 6 || proto
->protocol
== 17 || proto
->protocol
== 1))
284 if (snat
->port_snat
.port_min
== snat
->port_snat
.port_max
)
285 sprintf(buf
+ strlen(buf
), ":%u", snat
->port_snat
.port_min
);
287 sprintf(buf
+ strlen(buf
), ":%u-%u",
288 snat
->port_snat
.port_min
, snat
->port_snat
.port_max
);
290 if (snat
->connlimit_ports
) {
292 snprintf(portcntbuf
, sizeof(portcntbuf
), "%u",
293 1 + snat
->port_snat
.port_max
- snat
->port_snat
.port_min
);
295 fw3_ipt_rule_addarg(r
, false, "-m", "connlimit");
296 fw3_ipt_rule_addarg(r
, false, "--connlimit-daddr", NULL
);
297 fw3_ipt_rule_addarg(r
, false, "--connlimit-upto", portcntbuf
);
301 fw3_ipt_rule_target(r
, "SNAT");
302 fw3_ipt_rule_addarg(r
, false, "--to-source", buf
);
304 else if (snat
->target
== FW3_FLAG_ACCEPT
)
306 fw3_ipt_rule_target(r
, "ACCEPT");
310 fw3_ipt_rule_target(r
, "MASQUERADE");
315 set_comment(struct fw3_ipt_rule
*r
, const char *name
, int num
)
318 fw3_ipt_rule_comment(r
, name
);
320 fw3_ipt_rule_comment(r
, "@nat[%u]", num
);
324 print_snat(struct fw3_ipt_handle
*h
, struct fw3_state
*state
,
325 struct fw3_snat
*snat
, int num
, struct fw3_protocol
*proto
)
327 struct fw3_ipt_rule
*r
;
328 struct fw3_address
*src
, *dst
;
329 struct fw3_port
*spt
, *dpt
;
335 dst
= &snat
->ip_dest
;
336 spt
= &snat
->port_src
;
337 dpt
= &snat
->port_dest
;
339 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, src
, dst
);
340 fw3_ipt_rule_sport_dport(r
, spt
, dpt
);
341 fw3_ipt_rule_device(r
, snat
->device
, true);
342 fw3_ipt_rule_ipset(r
, &snat
->ipset
);
343 fw3_ipt_rule_limit(r
, &snat
->limit
);
344 fw3_ipt_rule_time(r
, &snat
->time
);
345 fw3_ipt_rule_mark(r
, &snat
->mark
);
346 set_target(r
, snat
, proto
);
347 fw3_ipt_rule_extra(r
, snat
->extra
);
348 set_comment(r
, snat
->name
, num
);
349 append_chain(r
, snat
);
358 expand_snat(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
359 struct fw3_snat
*snat
, int num
)
361 struct fw3_protocol
*proto
;
364 info(" * NAT '%s'", snat
->name
);
366 info(" * NAT #%u", num
);
368 if (!fw3_is_family(snat
->_src
, handle
->family
))
370 info(" ! Skipping due to different family of zone");
374 if (!fw3_is_family(&snat
->ip_src
, handle
->family
) ||
375 !fw3_is_family(&snat
->ip_dest
, handle
->family
) ||
376 !fw3_is_family(&snat
->ip_snat
, handle
->family
))
378 if (!snat
->ip_src
.resolved
||
379 !snat
->ip_dest
.resolved
||
380 !snat
->ip_snat
.resolved
)
381 info(" ! Skipping due to different family of ip address");
388 if (!fw3_is_family(snat
->ipset
.ptr
, handle
->family
))
390 info(" ! Skipping due to different family in ipset");
394 if (!fw3_check_ipset(snat
->ipset
.ptr
))
396 info(" ! Skipping due to missing ipset '%s'",
397 snat
->ipset
.ptr
->external
?
398 snat
->ipset
.ptr
->external
: snat
->ipset
.ptr
->name
);
402 set(snat
->ipset
.ptr
->flags
, handle
->family
, handle
->family
);
405 fw3_foreach(proto
, &snat
->proto
)
406 print_snat(handle
, state
, snat
, num
, proto
);
410 fw3_print_snats(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
)
413 struct fw3_snat
*snat
;
415 if (handle
->family
== FW3_FAMILY_V6
)
418 if (handle
->table
!= FW3_TABLE_NAT
)
421 list_for_each_entry(snat
, &state
->snats
, list
)
422 expand_snat(handle
, state
, snat
, num
++);