2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2013 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.
26 #include "redirects.h"
33 static bool print_rules = false;
34 static enum fw3_family use_family = FW3_FAMILY_ANY;
37 static struct fw3_state *
40 struct fw3_state *state = NULL;
41 struct uci_package *p = NULL;
43 if (!fw3_ubus_connect())
44 error("Failed to connect to ubus");
46 state = malloc(sizeof(*state));
49 error("Out of memory");
51 memset(state, 0, sizeof(*state));
52 state->uci = uci_alloc_context();
55 error("Out of memory");
57 if (uci_load(state->uci, "firewall", &p))
59 uci_perror(state->uci, NULL);
60 error("Failed to load /etc/config/firewall");
63 if (!fw3_find_command("ipset"))
65 warn("Unable to locate ipset utility, disabling ipset support");
66 state->disable_ipsets = true;
69 INIT_LIST_HEAD(&state->running_zones);
70 INIT_LIST_HEAD(&state->running_ipsets);
72 fw3_load_defaults(state, p);
73 fw3_load_ipsets(state, p);
74 fw3_load_zones(state, p);
75 fw3_load_rules(state, p);
76 fw3_load_redirects(state, p);
77 fw3_load_forwards(state, p);
78 fw3_load_includes(state, p);
80 state->statefile = fw3_read_statefile(state);
86 free_state(struct fw3_state *state)
88 struct list_head *cur, *tmp;
90 list_for_each_safe(cur, tmp, &state->zones)
91 fw3_free_zone((struct fw3_zone *)cur);
93 list_for_each_safe(cur, tmp, &state->rules)
94 fw3_free_rule((struct fw3_rule *)cur);
96 list_for_each_safe(cur, tmp, &state->redirects)
97 fw3_free_redirect((struct fw3_redirect *)cur);
99 list_for_each_safe(cur, tmp, &state->forwards)
100 fw3_free_forward((struct fw3_forward *)cur);
102 list_for_each_safe(cur, tmp, &state->ipsets)
103 fw3_free_ipset((struct fw3_ipset *)cur);
105 list_for_each_safe(cur, tmp, &state->includes)
106 fw3_free_include((struct fw3_include *)cur);
108 uci_free_context(state->uci);
112 fw3_ubus_disconnect();
117 restore_pipe(enum fw3_family family, bool silent)
121 cmd = (family == FW3_FAMILY_V4) ? "iptables-restore" : "ip6tables-restore";
124 return fw3_stdout_pipe();
126 if (!fw3_command_pipe(silent, cmd, "--lenient", "--noflush"))
128 warn("Unable to execute %s", cmd);
136 family_running(struct fw3_state *state, enum fw3_family family)
138 return hasbit(state->running_defaults.flags, family);
142 family_used(enum fw3_family family)
144 return (use_family == FW3_FAMILY_ANY) || (use_family == family);
148 family_loaded(struct fw3_state *state, enum fw3_family family)
150 return hasbit(state->defaults.flags, family);
154 family_set(struct fw3_state *state, enum fw3_family family, bool set)
157 setbit(state->defaults.flags, family);
159 delbit(state->defaults.flags, family);
163 stop(struct fw3_state *state, bool complete, bool reload)
168 enum fw3_family family;
169 enum fw3_table table;
170 enum fw3_target policy = reload ? FW3_TARGET_DROP : FW3_TARGET_ACCEPT;
172 if (!complete && !state->statefile)
175 warn("The firewall appears to be stopped. "
176 "Use the 'flush' command to forcefully purge all rules.");
181 for (family = FW3_FAMILY_V4; family <= FW3_FAMILY_V6; family++)
183 if (!complete && !family_running(state, family))
186 if (!family_used(family) || !restore_pipe(family, true))
189 info("Removing %s rules ...", fw3_flag_names[family]);
191 for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
193 if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
196 info(" * %sing %s table",
197 complete ? "Flush" : "Clear", fw3_flag_names[table]);
199 fw3_pr("*%s\n", fw3_flag_names[table]);
203 fw3_flush_all(table);
208 fw3_flush_rules(table, family, false, state, policy);
209 fw3_flush_zones(table, family, false, state);
212 fw3_flush_rules(table, family, true, state, policy);
213 fw3_flush_zones(table, family, true, state);
222 family_set(state, family, false);
227 if (!reload && fw3_command_pipe(false, "ipset", "-exist", "-"))
229 fw3_destroy_ipsets(state);
233 if (complete && (ct = fopen("/proc/net/nf_conntrack", "w")) != NULL)
235 info("Flushing conntrack table ...");
237 fwrite("f\n", 2, 1, ct);
242 fw3_write_statefile(state);
248 start(struct fw3_state *state, bool reload)
251 enum fw3_family family;
252 enum fw3_table table;
254 if (!print_rules && !reload)
256 fw3_set_defaults(state);
258 if (fw3_command_pipe(false, "ipset", "-exist", "-"))
260 fw3_create_ipsets(state);
265 for (family = FW3_FAMILY_V4; family <= FW3_FAMILY_V6; family++)
267 if (!family_used(family))
270 if (!print_rules && !reload && family_running(state, family))
272 warn("The %s firewall appears to be started already. "
273 "If it is indeed empty, remove the %s file and retry.",
274 fw3_flag_names[family], FW3_STATEFILE);
279 if (!family_loaded(state, family) || !restore_pipe(family, false))
282 info("Constructing %s rules ...", fw3_flag_names[family]);
284 for (table = FW3_TABLE_FILTER; table <= FW3_TABLE_RAW; table++)
286 if (!fw3_has_table(family == FW3_FAMILY_V6, fw3_flag_names[table]))
289 info(" * Populating %s table", fw3_flag_names[table]);
291 fw3_pr("*%s\n", fw3_flag_names[table]);
292 fw3_print_default_chains(table, family, state);
293 fw3_print_zone_chains(table, family, state);
294 fw3_print_default_head_rules(table, family, state);
295 fw3_print_rules(table, family, state);
296 fw3_print_redirects(table, family, state);
297 fw3_print_forwards(table, family, state);
298 fw3_print_zone_rules(table, family, state);
299 fw3_print_default_tail_rules(table, family, state);
304 fw3_print_includes(family, state);
307 family_set(state, family, true);
312 if (!reload && !print_rules)
313 fw3_run_includes(state);
315 if (!rv && !print_rules)
316 fw3_write_statefile(state);
322 lookup_network(struct fw3_state *state, const char *net)
325 struct fw3_device *d;
327 list_for_each_entry(z, &state->zones, list)
329 list_for_each_entry(d, &z->networks, list)
331 if (!strcmp(d->name, net))
333 printf("%s\n", z->name);
343 lookup_device(struct fw3_state *state, const char *dev)
346 struct fw3_device *d;
348 list_for_each_entry(z, &state->zones, list)
350 list_for_each_entry(d, &z->devices, list)
352 if (!strcmp(d->name, dev))
354 printf("%s\n", z->name);
366 fprintf(stderr, "fw3 [-4] [-6] [-q] {start|stop|flush|reload|restart|print}\n");
367 fprintf(stderr, "fw3 [-q] network {net}\n");
368 fprintf(stderr, "fw3 [-q] device {dev}\n");
374 int main(int argc, char **argv)
377 struct fw3_state *state = NULL;
378 struct fw3_defaults *defs = NULL;
380 while ((ch = getopt(argc, argv, "46dqh")) != -1)
385 use_family = FW3_FAMILY_V4;
389 use_family = FW3_FAMILY_V6;
397 freopen("/dev/null", "w", stderr);
406 state = build_state();
407 defs = &state->defaults;
418 if (use_family == FW3_FAMILY_V6 && defs->disable_ipv6)
419 warn("IPv6 rules globally disabled in configuration");
421 if (!strcmp(argv[optind], "print"))
423 if (use_family == FW3_FAMILY_ANY)
424 use_family = FW3_FAMILY_V4;
426 freopen("/dev/null", "w", stderr);
428 state->disable_ipsets = true;
431 rv = start(state, false);
433 else if (!strcmp(argv[optind], "start"))
435 rv = start(state, false);
437 else if (!strcmp(argv[optind], "stop"))
439 rv = stop(state, false, false);
441 else if (!strcmp(argv[optind], "flush"))
443 rv = stop(state, true, false);
445 else if (!strcmp(argv[optind], "restart"))
447 stop(state, true, false);
450 state = build_state();
451 rv = start(state, false);
453 else if (!strcmp(argv[optind], "reload"))
455 rv = stop(state, false, true);
456 rv = start(state, !rv);
458 else if (!strcmp(argv[optind], "network") && (optind + 1) < argc)
460 rv = lookup_network(state, argv[optind + 1]);
462 else if (!strcmp(argv[optind], "device") && (optind + 1) < argc)
464 rv = lookup_device(state, argv[optind + 1]);