2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2014 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.
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),
30 FW3_OPT("ipset", setmatch, snat, ipset),
32 FW3_LIST("proto", protocol, snat, proto),
34 FW3_OPT("src_ip", network, snat, ip_src),
35 FW3_OPT("src_port", port, snat, port_src),
37 FW3_OPT("snat_ip", network, snat, ip_snat),
38 FW3_OPT("snat_port", port, snat, port_snat),
40 FW3_OPT("dest_ip", network, snat, ip_dest),
41 FW3_OPT("dest_port", port, snat, port_dest),
43 FW3_OPT("extra", string, snat, extra),
45 FW3_OPT("limit", limit, snat, limit),
46 FW3_OPT("limit_burst", int, snat, limit.burst),
48 FW3_OPT("connlimit_ports", bool, snat, connlimit_ports),
50 FW3_OPT("utc_time", bool, snat, time.utc),
51 FW3_OPT("start_date", date, snat, time.datestart),
52 FW3_OPT("stop_date", date, snat, time.datestop),
53 FW3_OPT("start_time", time, snat, time.timestart),
54 FW3_OPT("stop_time", time, snat, time.timestop),
55 FW3_OPT("weekdays", weekdays, snat, time.weekdays),
56 FW3_OPT("monthdays", monthdays, snat, time.monthdays),
58 FW3_OPT("mark", mark, snat, mark),
60 FW3_OPT("target", target, snat, target),
67 check_families(struct uci_element *e, struct fw3_snat *r)
69 if (r->family == FW3_FAMILY_ANY)
72 if (r->_src && r->_src->family && r->_src->family != r->family)
74 warn_elem(e, "refers to source zone with different family");
78 if (r->ipset.ptr && r->ipset.ptr->family &&
79 r->ipset.ptr->family != r->family)
81 warn_elem(e, "refers to ipset with different family");
85 if (r->ip_src.family && r->ip_src.family != r->family)
87 warn_elem(e, "uses source ip with different family");
91 if (r->ip_dest.family && r->ip_dest.family != r->family)
93 warn_elem(e, "uses destination ip with different family");
97 if (r->ip_snat.family && r->ip_snat.family != r->family)
99 warn_elem(e, "uses snat ip with different family");
107 fw3_load_snats(struct fw3_state *state, struct uci_package *p)
109 struct uci_section *s;
110 struct uci_element *e;
111 struct fw3_snat *snat;
113 INIT_LIST_HEAD(&state->snats);
115 uci_foreach_element(&p->sections, e)
117 s = uci_to_section(e);
119 if (strcmp(s->type, "nat"))
122 snat = malloc(sizeof(*snat));
127 memset(snat, 0, sizeof(*snat));
129 INIT_LIST_HEAD(&snat->proto);
131 snat->enabled = true;
133 if (!fw3_parse_options(snat, fw3_snat_opts, s))
135 warn_elem(e, "skipped due to invalid options");
146 if (snat->src.invert)
148 warn_elem(e, "must not have an inverted source");
152 else if (snat->src.set && !snat->src.any &&
153 !(snat->_src = fw3_lookup_zone(state, snat->src.name)))
155 warn_elem(e, "refers to not existing zone '%s'", snat->src.name);
159 else if (snat->ipset.set && state->disable_ipsets)
161 warn_elem(e, "skipped due to disabled ipset support");
165 else if (snat->ipset.set &&
166 !(snat->ipset.ptr = fw3_lookup_ipset(state, snat->ipset.name)))
168 warn_elem(e, "refers to unknown ipset '%s'", snat->ipset.name);
173 if (!check_families(e, snat))
179 if (snat->target == FW3_FLAG_UNSPEC)
181 warn_elem(e, "has no target specified, defaulting to MASQUERADE");
182 snat->target = FW3_FLAG_MASQUERADE;
184 else if (snat->target != FW3_FLAG_ACCEPT && snat->target != FW3_FLAG_SNAT &&
185 snat->target != FW3_FLAG_MASQUERADE)
187 warn_elem(e, "has invalid target specified, defaulting to MASQUERADE");
188 snat->target = FW3_FLAG_MASQUERADE;
191 if (snat->target == FW3_FLAG_SNAT &&
192 !snat->ip_snat.set && !snat->port_snat.set)
194 warn_elem(e, "needs either 'snat_ip' or 'snat_port' for SNAT");
198 else if (snat->target != FW3_FLAG_SNAT && snat->ip_snat.set)
200 warn_elem(e, "must not use 'snat_ip' for non-SNAT");
204 else if (snat->target != FW3_FLAG_SNAT && snat->port_snat.set)
206 warn_elem(e, "must not use 'snat_port' for non-SNAT");
211 if (list_empty(&snat->proto))
213 warn_elem(e, "does not specify a protocol, assuming all");
214 fw3_parse_protocol(&snat->proto, "all", true);
219 set(snat->_src->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT);
220 snat->_src->conntrack = true;
223 list_add_tail(&snat->list, &state->snats);
228 append_chain(struct fw3_ipt_rule *r, struct fw3_snat *snat)
231 fw3_ipt_rule_append(r, "zone_%s_postrouting", snat->src.name);
233 fw3_ipt_rule_append(r, "delegate_postrouting");
237 set_target(struct fw3_ipt_rule *r, struct fw3_snat *snat,
238 struct fw3_protocol *proto)
240 char buf[sizeof("255.255.255.255:65535-65535\0")];
242 if (snat->target == FW3_FLAG_SNAT)
246 if (snat->ip_snat.set)
248 inet_ntop(AF_INET, &snat->ip_snat.address.v4, buf, sizeof(buf));
251 if (snat->port_snat.set && proto && !proto->any &&
252 (proto->protocol == 6 || proto->protocol == 17 || proto->protocol == 1))
254 if (snat->port_snat.port_min == snat->port_snat.port_max)
255 sprintf(buf + strlen(buf), ":%u", snat->port_snat.port_min);
257 sprintf(buf + strlen(buf), ":%u-%u",
258 snat->port_snat.port_min, snat->port_snat.port_max);
260 if (snat->connlimit_ports) {
262 snprintf(portcntbuf, sizeof(portcntbuf), "%u",
263 1 + snat->port_snat.port_max - snat->port_snat.port_min);
265 fw3_ipt_rule_addarg(r, false, "-m", "connlimit");
266 fw3_ipt_rule_addarg(r, false, "--connlimit-daddr", NULL);
267 fw3_ipt_rule_addarg(r, false, "--connlimit-upto", portcntbuf);
271 fw3_ipt_rule_target(r, "SNAT");
272 fw3_ipt_rule_addarg(r, false, "--to-source", buf);
274 else if (snat->target == FW3_FLAG_ACCEPT)
276 fw3_ipt_rule_target(r, "ACCEPT");
280 fw3_ipt_rule_target(r, "MASQUERADE");
285 set_comment(struct fw3_ipt_rule *r, const char *name, int num)
288 fw3_ipt_rule_comment(r, name);
290 fw3_ipt_rule_comment(r, "@nat[%u]", num);
294 print_snat(struct fw3_ipt_handle *h, struct fw3_state *state,
295 struct fw3_snat *snat, int num, struct fw3_protocol *proto)
297 struct fw3_ipt_rule *r;
298 struct fw3_address *src, *dst;
299 struct fw3_port *spt, *dpt;
305 dst = &snat->ip_dest;
306 spt = &snat->port_src;
307 dpt = &snat->port_dest;
309 r = fw3_ipt_rule_create(h, proto, NULL, NULL, src, dst);
310 fw3_ipt_rule_sport_dport(r, spt, dpt);
311 fw3_ipt_rule_ipset(r, &snat->ipset);
312 fw3_ipt_rule_limit(r, &snat->limit);
313 fw3_ipt_rule_time(r, &snat->time);
314 fw3_ipt_rule_mark(r, &snat->mark);
315 set_target(r, snat, proto);
316 fw3_ipt_rule_extra(r, snat->extra);
317 set_comment(r, snat->name, num);
318 append_chain(r, snat);
327 expand_snat(struct fw3_ipt_handle *handle, struct fw3_state *state,
328 struct fw3_snat *snat, int num)
330 struct fw3_protocol *proto;
333 info(" * NAT '%s'", snat->name);
335 info(" * NAT #%u", num);
337 if (!fw3_is_family(snat->_src, handle->family))
339 info(" ! Skipping due to different family of zone");
343 if (!fw3_is_family(&snat->ip_src, handle->family) ||
344 !fw3_is_family(&snat->ip_dest, handle->family) ||
345 !fw3_is_family(&snat->ip_snat, handle->family))
347 if (!snat->ip_src.resolved ||
348 !snat->ip_dest.resolved ||
349 !snat->ip_snat.resolved)
350 info(" ! Skipping due to different family of ip address");
357 if (!fw3_is_family(snat->ipset.ptr, handle->family))
359 info(" ! Skipping due to different family in ipset");
363 if (!fw3_check_ipset(snat->ipset.ptr))
365 info(" ! Skipping due to missing ipset '%s'",
366 snat->ipset.ptr->external ?
367 snat->ipset.ptr->external : snat->ipset.ptr->name);
371 set(snat->ipset.ptr->flags, handle->family, handle->family);
374 fw3_foreach(proto, &snat->proto)
375 print_snat(handle, state, snat, num, proto);
379 fw3_print_snats(struct fw3_ipt_handle *handle, struct fw3_state *state)
382 struct fw3_snat *snat;
384 if (handle->family == FW3_FAMILY_V6)
387 if (handle->table != FW3_TABLE_NAT)
390 list_for_each_entry(snat, &state->snats, list)
391 expand_snat(handle, state, snat, num++);