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_section("nat", r
, 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_section("nat", r
, e
, "refers to ipset with different family");
86 if (r
->ip_src
.family
&& r
->ip_src
.family
!= r
->family
)
88 warn_section("nat", r
, e
, "uses source ip with different family");
92 if (r
->ip_dest
.family
&& r
->ip_dest
.family
!= r
->family
)
94 warn_section("nat", r
, e
, "uses destination ip with different family");
98 if (r
->ip_snat
.family
&& r
->ip_snat
.family
!= r
->family
)
100 warn_section("nat", r
, 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;
123 check_snat(struct fw3_state
*state
, struct fw3_snat
*snat
, struct uci_element
*e
)
128 if (snat
->src
.invert
)
130 warn_section("nat", snat
, e
, "must not have an inverted source");
133 else if (snat
->src
.set
&& !snat
->src
.any
&&
134 !(snat
->_src
= fw3_lookup_zone(state
, snat
->src
.name
)))
136 warn_section("nat", snat
, e
, "refers to not existing zone '%s'", snat
->src
.name
);
139 else if (snat
->ipset
.set
&& state
->disable_ipsets
)
141 warn_section("nat", snat
, e
, "skipped due to disabled ipset support");
144 else if (snat
->ipset
.set
&&
145 !(snat
->ipset
.ptr
= fw3_lookup_ipset(state
, snat
->ipset
.name
)))
147 warn_section("nat", snat
, e
, "refers to unknown ipset '%s'", snat
->ipset
.name
);
151 if (!check_families(e
, snat
))
154 if (snat
->target
== FW3_FLAG_UNSPEC
)
156 warn_section("nat", snat
, e
, "has no target specified, defaulting to MASQUERADE");
157 snat
->target
= FW3_FLAG_MASQUERADE
;
159 else if (snat
->target
!= FW3_FLAG_ACCEPT
&& snat
->target
!= FW3_FLAG_SNAT
&&
160 snat
->target
!= FW3_FLAG_MASQUERADE
)
162 warn_section("nat", snat
, e
, "has invalid target specified, defaulting to MASQUERADE");
163 snat
->target
= FW3_FLAG_MASQUERADE
;
166 if (snat
->target
== FW3_FLAG_SNAT
&&
167 !snat
->ip_snat
.set
&& !snat
->port_snat
.set
)
169 warn_section("nat", snat
, e
, "needs either 'snat_ip' or 'snat_port' for SNAT");
172 else if (snat
->target
!= FW3_FLAG_SNAT
&& snat
->ip_snat
.set
)
174 warn_section("nat", snat
, e
, "must not use 'snat_ip' for non-SNAT");
177 else if (snat
->target
!= FW3_FLAG_SNAT
&& snat
->port_snat
.set
)
179 warn_section("nat", snat
, e
, "must not use 'snat_port' for non-SNAT");
183 if (list_empty(&snat
->proto
))
185 warn_section("nat", snat
, e
, "does not specify a protocol, assuming all");
186 fw3_parse_protocol(&snat
->proto
, "all", true);
190 set(snat
->_src
->flags
, FW3_FAMILY_V4
, FW3_FLAG_SNAT
);
197 fw3_load_snats(struct fw3_state
*state
, struct uci_package
*p
, struct blob_attr
*a
)
199 struct uci_section
*s
;
200 struct uci_element
*e
;
201 struct fw3_snat
*snat
;
202 struct blob_attr
*entry
;
205 INIT_LIST_HEAD(&state
->snats
);
207 blob_for_each_attr(entry
, a
, rem
) {
208 const char *type
= NULL
;
209 const char *name
= "ubus rule";
211 if (!fw3_attr_parse_name_type(entry
, &name
, &type
))
214 if (strcmp(type
, "nat"))
217 snat
= alloc_snat(state
);
221 if (!fw3_parse_blob_options(snat
, fw3_snat_opts
, entry
, name
))
223 warn_section("nat", snat
, NULL
, "skipped due to invalid options");
228 if (!check_snat(state
, snat
, NULL
))
232 uci_foreach_element(&p
->sections
, e
)
234 s
= uci_to_section(e
);
236 if (strcmp(s
->type
, "nat"))
239 snat
= alloc_snat(state
);
243 if (!fw3_parse_options(snat
, fw3_snat_opts
, s
))
245 warn_elem(e
, "skipped due to invalid options");
250 if (!check_snat(state
, snat
, e
))
256 append_chain(struct fw3_ipt_rule
*r
, struct fw3_snat
*snat
)
259 fw3_ipt_rule_append(r
, "zone_%s_postrouting", snat
->src
.name
);
261 fw3_ipt_rule_append(r
, "POSTROUTING");
265 set_target(struct fw3_ipt_rule
*r
, struct fw3_snat
*snat
,
266 struct fw3_protocol
*proto
)
268 char buf
[sizeof("255.255.255.255:65535-65535\0")];
270 if (snat
->target
== FW3_FLAG_SNAT
)
274 if (snat
->ip_snat
.set
)
276 inet_ntop(AF_INET
, &snat
->ip_snat
.address
.v4
, buf
, sizeof(buf
));
279 if (snat
->port_snat
.set
&& proto
&& !proto
->any
&&
280 (proto
->protocol
== 6 || proto
->protocol
== 17 || proto
->protocol
== 1))
282 if (snat
->port_snat
.port_min
== snat
->port_snat
.port_max
)
283 sprintf(buf
+ strlen(buf
), ":%u", snat
->port_snat
.port_min
);
285 sprintf(buf
+ strlen(buf
), ":%u-%u",
286 snat
->port_snat
.port_min
, snat
->port_snat
.port_max
);
288 if (snat
->connlimit_ports
) {
290 snprintf(portcntbuf
, sizeof(portcntbuf
), "%u",
291 1 + snat
->port_snat
.port_max
- snat
->port_snat
.port_min
);
293 fw3_ipt_rule_addarg(r
, false, "-m", "connlimit");
294 fw3_ipt_rule_addarg(r
, false, "--connlimit-daddr", NULL
);
295 fw3_ipt_rule_addarg(r
, false, "--connlimit-upto", portcntbuf
);
299 fw3_ipt_rule_target(r
, "SNAT");
300 fw3_ipt_rule_addarg(r
, false, "--to-source", buf
);
302 else if (snat
->target
== FW3_FLAG_ACCEPT
)
304 fw3_ipt_rule_target(r
, "ACCEPT");
308 fw3_ipt_rule_target(r
, "MASQUERADE");
313 set_comment(struct fw3_ipt_rule
*r
, const char *name
, int num
)
316 fw3_ipt_rule_comment(r
, name
);
318 fw3_ipt_rule_comment(r
, "@nat[%u]", num
);
322 print_snat(struct fw3_ipt_handle
*h
, struct fw3_state
*state
,
323 struct fw3_snat
*snat
, int num
, struct fw3_protocol
*proto
)
325 struct fw3_ipt_rule
*r
;
326 struct fw3_address
*src
, *dst
;
327 struct fw3_port
*spt
, *dpt
;
333 dst
= &snat
->ip_dest
;
334 spt
= &snat
->port_src
;
335 dpt
= &snat
->port_dest
;
337 r
= fw3_ipt_rule_create(h
, proto
, NULL
, NULL
, src
, dst
);
338 fw3_ipt_rule_sport_dport(r
, spt
, dpt
);
339 fw3_ipt_rule_device(r
, snat
->device
, true);
340 fw3_ipt_rule_ipset(r
, &snat
->ipset
);
341 fw3_ipt_rule_limit(r
, &snat
->limit
);
342 fw3_ipt_rule_time(r
, &snat
->time
);
343 fw3_ipt_rule_mark(r
, &snat
->mark
);
344 set_target(r
, snat
, proto
);
345 fw3_ipt_rule_extra(r
, snat
->extra
);
346 set_comment(r
, snat
->name
, num
);
347 append_chain(r
, snat
);
356 expand_snat(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
,
357 struct fw3_snat
*snat
, int num
)
359 struct fw3_protocol
*proto
;
362 info(" * NAT '%s'", snat
->name
);
364 info(" * NAT #%u", num
);
366 if (!fw3_is_family(snat
->_src
, handle
->family
))
368 info(" ! Skipping due to different family of zone");
372 if (!fw3_is_family(&snat
->ip_src
, handle
->family
) ||
373 !fw3_is_family(&snat
->ip_dest
, handle
->family
) ||
374 !fw3_is_family(&snat
->ip_snat
, handle
->family
))
376 if (!snat
->ip_src
.resolved
||
377 !snat
->ip_dest
.resolved
||
378 !snat
->ip_snat
.resolved
)
379 info(" ! Skipping due to different family of ip address");
386 if (!fw3_is_family(snat
->ipset
.ptr
, handle
->family
))
388 info(" ! Skipping due to different family in ipset");
392 if (!fw3_check_ipset(snat
->ipset
.ptr
))
394 info(" ! Skipping due to missing ipset '%s'",
395 snat
->ipset
.ptr
->external
?
396 snat
->ipset
.ptr
->external
: snat
->ipset
.ptr
->name
);
400 set(snat
->ipset
.ptr
->flags
, handle
->family
, handle
->family
);
403 fw3_foreach(proto
, &snat
->proto
)
404 print_snat(handle
, state
, snat
, num
, proto
);
408 fw3_print_snats(struct fw3_ipt_handle
*handle
, struct fw3_state
*state
)
411 struct fw3_snat
*snat
;
413 if (handle
->family
== FW3_FAMILY_V6
)
416 if (handle
->table
!= FW3_TABLE_NAT
)
419 list_for_each_entry(snat
, &state
->snats
, list
)
420 expand_snat(handle
, state
, snat
, num
++);