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++);