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),
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 *rule, *opt;
132 INIT_LIST_HEAD(&state->snats);
134 blob_for_each_attr(rule, a, rem) {
135 const char *type = NULL;
136 blobmsg_for_each_attr(opt, rule, orem)
137 if (!strcmp(blobmsg_name(opt), "type"))
138 type = blobmsg_get_string(opt);
140 if (!type || strcmp(type, "nat"))
143 if (!(snat = alloc_snat(state)))
146 if (!fw3_parse_blob_options(snat, fw3_snat_opts, rule))
148 fprintf(stderr, "ubus section skipped due to invalid options\n");
154 uci_foreach_element(&p->sections, e)
156 s = uci_to_section(e);
158 if (strcmp(s->type, "nat"))
161 if (!(snat = alloc_snat(state)))
164 if (!fw3_parse_options(snat, fw3_snat_opts, s))
166 warn_elem(e, "skipped due to invalid options");
172 list_for_each_entry_safe(snat, n, &state->snats, list)
180 if (snat->src.invert)
182 warn_elem(e, "must not have an inverted source");
186 else if (snat->src.set && !snat->src.any &&
187 !(snat->_src = fw3_lookup_zone(state, snat->src.name)))
189 warn_elem(e, "refers to not existing zone '%s'", snat->src.name);
193 else if (snat->ipset.set && state->disable_ipsets)
195 warn_elem(e, "skipped due to disabled ipset support");
199 else if (snat->ipset.set &&
200 !(snat->ipset.ptr = fw3_lookup_ipset(state, snat->ipset.name)))
202 warn_elem(e, "refers to unknown ipset '%s'", snat->ipset.name);
207 if (!check_families(e, snat))
213 if (snat->target == FW3_FLAG_UNSPEC)
215 warn_elem(e, "has no target specified, defaulting to MASQUERADE");
216 snat->target = FW3_FLAG_MASQUERADE;
218 else if (snat->target != FW3_FLAG_ACCEPT && snat->target != FW3_FLAG_SNAT &&
219 snat->target != FW3_FLAG_MASQUERADE)
221 warn_elem(e, "has invalid target specified, defaulting to MASQUERADE");
222 snat->target = FW3_FLAG_MASQUERADE;
225 if (snat->target == FW3_FLAG_SNAT &&
226 !snat->ip_snat.set && !snat->port_snat.set)
228 warn_elem(e, "needs either 'snat_ip' or 'snat_port' for SNAT");
232 else if (snat->target != FW3_FLAG_SNAT && snat->ip_snat.set)
234 warn_elem(e, "must not use 'snat_ip' for non-SNAT");
238 else if (snat->target != FW3_FLAG_SNAT && snat->port_snat.set)
240 warn_elem(e, "must not use 'snat_port' for non-SNAT");
245 if (list_empty(&snat->proto))
247 warn_elem(e, "does not specify a protocol, assuming all");
248 fw3_parse_protocol(&snat->proto, "all", true);
253 set(snat->_src->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT);
254 snat->_src->conntrack = true;
260 append_chain(struct fw3_ipt_rule *r, struct fw3_snat *snat)
263 fw3_ipt_rule_append(r, "zone_%s_postrouting", snat->src.name);
265 fw3_ipt_rule_append(r, "delegate_postrouting");
269 set_target(struct fw3_ipt_rule *r, struct fw3_snat *snat,
270 struct fw3_protocol *proto)
272 char buf[sizeof("255.255.255.255:65535-65535\0")];
274 if (snat->target == FW3_FLAG_SNAT)
278 if (snat->ip_snat.set)
280 inet_ntop(AF_INET, &snat->ip_snat.address.v4, buf, sizeof(buf));
283 if (snat->port_snat.set && proto && !proto->any &&
284 (proto->protocol == 6 || proto->protocol == 17 || proto->protocol == 1))
286 if (snat->port_snat.port_min == snat->port_snat.port_max)
287 sprintf(buf + strlen(buf), ":%u", snat->port_snat.port_min);
289 sprintf(buf + strlen(buf), ":%u-%u",
290 snat->port_snat.port_min, snat->port_snat.port_max);
292 if (snat->connlimit_ports) {
294 snprintf(portcntbuf, sizeof(portcntbuf), "%u",
295 1 + snat->port_snat.port_max - snat->port_snat.port_min);
297 fw3_ipt_rule_addarg(r, false, "-m", "connlimit");
298 fw3_ipt_rule_addarg(r, false, "--connlimit-daddr", NULL);
299 fw3_ipt_rule_addarg(r, false, "--connlimit-upto", portcntbuf);
303 fw3_ipt_rule_target(r, "SNAT");
304 fw3_ipt_rule_addarg(r, false, "--to-source", buf);
306 else if (snat->target == FW3_FLAG_ACCEPT)
308 fw3_ipt_rule_target(r, "ACCEPT");
312 fw3_ipt_rule_target(r, "MASQUERADE");
317 set_comment(struct fw3_ipt_rule *r, const char *name, int num)
320 fw3_ipt_rule_comment(r, name);
322 fw3_ipt_rule_comment(r, "@nat[%u]", num);
326 print_snat(struct fw3_ipt_handle *h, struct fw3_state *state,
327 struct fw3_snat *snat, int num, struct fw3_protocol *proto)
329 struct fw3_ipt_rule *r;
330 struct fw3_address *src, *dst;
331 struct fw3_port *spt, *dpt;
337 dst = &snat->ip_dest;
338 spt = &snat->port_src;
339 dpt = &snat->port_dest;
341 r = fw3_ipt_rule_create(h, proto, NULL, NULL, src, dst);
342 fw3_ipt_rule_sport_dport(r, spt, dpt);
343 fw3_ipt_rule_device(r, snat->device, true);
344 fw3_ipt_rule_ipset(r, &snat->ipset);
345 fw3_ipt_rule_limit(r, &snat->limit);
346 fw3_ipt_rule_time(r, &snat->time);
347 fw3_ipt_rule_mark(r, &snat->mark);
348 set_target(r, snat, proto);
349 fw3_ipt_rule_extra(r, snat->extra);
350 set_comment(r, snat->name, num);
351 append_chain(r, snat);
360 expand_snat(struct fw3_ipt_handle *handle, struct fw3_state *state,
361 struct fw3_snat *snat, int num)
363 struct fw3_protocol *proto;
366 info(" * NAT '%s'", snat->name);
368 info(" * NAT #%u", num);
370 if (!fw3_is_family(snat->_src, handle->family))
372 info(" ! Skipping due to different family of zone");
376 if (!fw3_is_family(&snat->ip_src, handle->family) ||
377 !fw3_is_family(&snat->ip_dest, handle->family) ||
378 !fw3_is_family(&snat->ip_snat, handle->family))
380 if (!snat->ip_src.resolved ||
381 !snat->ip_dest.resolved ||
382 !snat->ip_snat.resolved)
383 info(" ! Skipping due to different family of ip address");
390 if (!fw3_is_family(snat->ipset.ptr, handle->family))
392 info(" ! Skipping due to different family in ipset");
396 if (!fw3_check_ipset(snat->ipset.ptr))
398 info(" ! Skipping due to missing ipset '%s'",
399 snat->ipset.ptr->external ?
400 snat->ipset.ptr->external : snat->ipset.ptr->name);
404 set(snat->ipset.ptr->flags, handle->family, handle->family);
407 fw3_foreach(proto, &snat->proto)
408 print_snat(handle, state, snat, num, proto);
412 fw3_print_snats(struct fw3_ipt_handle *handle, struct fw3_state *state)
415 struct fw3_snat *snat;
417 if (handle->family == FW3_FAMILY_V6)
420 if (handle->table != FW3_TABLE_NAT)
423 list_for_each_entry(snat, &state->snats, list)
424 expand_snat(handle, state, snat, num++);