5 * Copyright (C) 2007-2010 Intel Corporation. All rights reserved.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
31 #include <sys/errno.h>
32 #include <sys/socket.h>
35 #include <linux/netfilter_ipv4/ip_tables.h>
40 static const char *hooknames[] = {
41 [NF_IP_PRE_ROUTING] = "PREROUTING",
42 [NF_IP_LOCAL_IN] = "INPUT",
43 [NF_IP_FORWARD] = "FORWARD",
44 [NF_IP_LOCAL_OUT] = "OUTPUT",
45 [NF_IP_POST_ROUTING] = "POSTROUTING",
48 #define LABEL_ACCEPT "ACCEPT"
49 #define LABEL_DROP "DROP"
50 #define LABEL_QUEUE "QUEUE"
51 #define LABEL_RETURN "RETURN"
53 /* fn returns 0 to continue iteration */
54 #define _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
61 for (__i = 0, __n = 0; __i < (size); \
62 __i += __entry->next_offset, __n++) { \
63 __entry = (void *)(entries) + __i; \
67 __ret = fn(__entry, ## args); \
74 /* fn returns 0 to continue iteration */
75 #define _XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
76 _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
78 #define ENTRY_ITERATE(entries, size, fn, args...) \
79 _XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
81 #define MIN_ALIGN (__alignof__(struct ipt_entry))
83 #define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
85 struct ipt_error_target {
86 struct xt_entry_target t;
87 char error[IPT_TABLE_MAXNAMELEN];
90 struct connman_iptables_entry {
93 struct ipt_entry *entry;
96 struct connman_iptables {
99 struct ipt_getinfo *info;
100 struct ipt_get_entries *blob_entries;
102 unsigned int num_entries;
103 unsigned int old_entries;
109 static GHashTable *table_hash = NULL;
111 static struct ipt_entry *get_entry(struct connman_iptables *table,
114 return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
118 static int is_hook_entry(struct connman_iptables *table,
119 struct ipt_entry *entry)
123 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
124 if ((table->info->valid_hooks & (1 << i))
125 && get_entry(table, table->info->hook_entry[i]) == entry)
132 static unsigned long entry_to_offset(struct connman_iptables *table,
133 struct ipt_entry *entry)
135 return (void *)entry - (void *)table->blob_entries->entrytable;
138 static int target_to_verdict(char *target_name)
140 if (!strcmp(target_name, LABEL_ACCEPT))
141 return -NF_ACCEPT - 1;
143 if (!strcmp(target_name, LABEL_DROP))
146 if (!strcmp(target_name, LABEL_QUEUE))
147 return -NF_QUEUE - 1;
149 if (!strcmp(target_name, LABEL_RETURN))
155 static gboolean is_builtin_target(char *target_name)
157 if (!strcmp(target_name, LABEL_ACCEPT) ||
158 !strcmp(target_name, LABEL_DROP) ||
159 !strcmp(target_name, LABEL_QUEUE) ||
160 !strcmp(target_name, LABEL_RETURN))
166 static gboolean is_chain(struct connman_iptables *table,
167 struct connman_iptables_entry *e)
170 struct ipt_entry *entry;
171 struct xt_entry_target *target;
174 builtin = is_hook_entry(table, entry);
178 target = ipt_get_target(entry);
179 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
185 static GList *find_chain_tail(struct connman_iptables *table,
188 GList *chain_head, *list;
189 struct connman_iptables_entry *head, *tail;
190 struct ipt_entry *entry;
191 struct xt_entry_target *target;
194 /* First we look for the head */
195 for (list = table->entries; list; list = list->next) {
200 builtin = is_hook_entry(table, entry);
201 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
204 /* User defined chain */
205 target = ipt_get_target(entry);
206 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
207 !strcmp((char *)target->data, chain_name))
216 /* Then we look for the next chain */
217 for (list = chain_head->next; list; list = list->next) {
221 if (is_chain(table, tail))
225 /* Nothing found, we return the table end */
226 return g_list_last(table->entries);
229 static int iptables_add_entry(struct connman_iptables *table,
230 struct ipt_entry *entry, GList *before)
232 struct connman_iptables_entry *e;
237 e = g_try_malloc0(sizeof(struct connman_iptables_entry));
243 table->entries = g_list_insert_before(table->entries, before, e);
244 table->num_entries++;
245 table->size += entry->next_offset;
250 static int iptables_add_chain(struct connman_iptables *table,
254 struct ipt_entry *entry_head;
255 struct ipt_entry *entry_return;
256 struct ipt_error_target *error;
257 struct ipt_standard_target *standard;
258 u_int16_t entry_head_size, entry_return_size;
260 last = g_list_last(table->entries);
263 * An empty chain is composed of:
264 * - A head entry, with no match and an error target.
265 * The error target data is the chain name.
266 * - A tail entry, with no match and a standard target.
267 * The standard target verdict is XT_RETURN (return to the
272 entry_head_size = sizeof(struct ipt_entry) +
273 sizeof(struct ipt_error_target);
274 entry_head = g_try_malloc0(entry_head_size);
275 if (entry_head == NULL)
278 memset(entry_head, 0, entry_head_size);
280 entry_head->target_offset = sizeof(struct ipt_entry);
281 entry_head->next_offset = entry_head_size;
283 error = (struct ipt_error_target *) entry_head->elems;
284 strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
285 error->t.u.user.target_size = ALIGN(sizeof(struct ipt_error_target));
286 strcpy(error->error, name);
288 if (iptables_add_entry(table, entry_head, last) < 0)
292 entry_return_size = sizeof(struct ipt_entry) +
293 sizeof(struct ipt_standard_target);
294 entry_return = g_try_malloc0(entry_return_size);
295 if (entry_return == NULL)
298 memset(entry_return, 0, entry_return_size);
300 entry_return->target_offset = sizeof(struct ipt_entry);
301 entry_return->next_offset = entry_return_size;
303 standard = (struct ipt_standard_target *) entry_return->elems;
304 standard->target.u.user.target_size =
305 ALIGN(sizeof(struct ipt_standard_target));
306 standard->verdict = XT_RETURN;
308 if (iptables_add_entry(table, entry_return, last) < 0)
315 g_free(entry_return);
320 static struct ipt_entry *
321 new_builtin_rule(char *target_name, struct xtables_match *xt_m)
323 struct ipt_entry *entry;
324 size_t match_size, target_size;
325 struct xt_entry_match *entry_match;
326 struct xt_standard_target *target;
329 match_size = xt_m->m->u.match_size;
333 target_size = ALIGN(sizeof(struct xt_standard_target));
335 entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
340 entry->target_offset = sizeof(struct ipt_entry) + match_size;
341 entry->next_offset = sizeof(struct ipt_entry) + target_size +
344 entry_match = (struct xt_entry_match *)entry->elems;
345 memcpy(entry_match, xt_m->m, match_size);
348 target = (struct xt_standard_target *)ipt_get_target(entry);
349 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
350 target->target.u.user.target_size =
351 ALIGN(sizeof(struct ipt_standard_target));
352 target->verdict = target_to_verdict(target_name);
357 static struct ipt_entry *
358 new_custom_rule(struct xtables_target *xt_t, struct xtables_match *xt_m)
360 struct ipt_entry *entry;
361 size_t match_size, target_size;
362 struct xt_entry_match *entry_match;
363 struct xt_entry_target *entry_target;
366 match_size = xt_m->m->u.match_size;
371 target_size = ALIGN(xt_t->t->u.target_size);
375 entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
380 entry->target_offset = sizeof(struct ipt_entry) + match_size;
381 entry->next_offset = sizeof(struct ipt_entry) + target_size +
384 entry_match = (struct xt_entry_match *)entry->elems;
385 memcpy(entry_match, xt_m->m, match_size);
389 entry_target = ipt_get_target(entry);
390 memcpy(entry_target, xt_t->t, target_size);
396 static struct ipt_entry *
397 new_rule(char *target_name, struct xtables_target *xt_t,
398 char *match_name, struct xtables_match *xt_m)
400 struct ipt_entry *new_entry;
402 if (is_builtin_target(target_name))
403 new_entry = new_builtin_rule(target_name, xt_m);
405 new_entry = new_custom_rule(xt_t, xt_m);
411 iptables_add_rule(struct connman_iptables *table, char *chain_name,
412 char *target_name, struct xtables_target *xt_t,
413 char *match_name, struct xtables_match *xt_m)
416 struct ipt_entry *new_entry;
418 chain_tail = find_chain_tail(table, chain_name);
419 if (chain_tail == NULL)
422 new_entry = new_rule(target_name, xt_t,
424 if (new_entry == NULL)
427 return iptables_add_entry(table, new_entry, chain_tail->prev);
430 static struct ipt_replace *
431 iptables_blob(struct connman_iptables *table)
433 struct ipt_replace *r;
435 struct connman_iptables_entry *e;
436 unsigned char *entry_index;
438 r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
442 memset(r, 0, sizeof(*r) + table->size);
444 r->counters = g_try_malloc0(sizeof(struct xt_counters)
445 * table->num_entries);
446 if (r->counters == NULL) {
451 strcpy(r->name, table->info->name);
452 r->num_entries = table->num_entries;
453 r->size = table->size;
455 r->num_counters = table->old_entries;
456 r->valid_hooks = table->info->valid_hooks;
458 memcpy(r->hook_entry, table->info->hook_entry,
459 sizeof(table->info->hook_entry));
460 memcpy(r->underflow, table->info->underflow,
461 sizeof(table->info->underflow));
463 entry_index = (unsigned char *)r->entries;
464 for (list = table->entries; list; list = list->next) {
467 memcpy(entry_index, e->entry, e->entry->next_offset);
468 entry_index += e->entry->next_offset;
474 static void dump_target(struct connman_iptables *table,
475 struct ipt_entry *entry)
478 struct xtables_target *xt_t;
479 struct xt_entry_target *target;
481 target = ipt_get_target(entry);
483 if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
484 struct xt_standard_target *t;
486 t = (struct xt_standard_target *)target;
488 switch (t->verdict) {
490 connman_info("\ttarget RETURN");
494 connman_info("\ttarget ACCEPT");
498 connman_info("\ttarget DROP");
502 connman_info("\ttarget QUEUE");
506 connman_info("\ttarget STOP");
510 connman_info("\tJUMP @%p (0x%x)",
511 (char*)table->blob_entries->entrytable +
512 t->verdict, t->verdict);
516 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
517 XTF_LOAD_MUST_SUCCEED);
519 if(xt_t->print != NULL)
520 xt_t->print(NULL, target, 1);
522 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
524 connman_info("\ttarget %s", target->u.user.name);
528 if(xt_t->print != NULL) {
529 connman_info("\ttarget ");
530 xt_t->print(NULL, target, 1);
535 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
537 struct xtables_match *xt_m;
538 struct xt_entry_match *match;
540 if (entry->elems == (unsigned char *)entry + entry->target_offset)
543 match = (struct xt_entry_match *) entry->elems;
545 if (!strlen(match->u.user.name))
548 xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
552 if(xt_m->print != NULL) {
553 connman_info("\tmatch ");
554 xt_m->print(NULL, match, 1);
560 connman_info("\tmatch %s", match->u.user.name);
564 static int dump_entry(struct ipt_entry *entry,
565 struct connman_iptables *table)
567 struct xt_entry_target *target;
571 offset = (char *)entry - (char *)table->blob_entries->entrytable;
572 target = ipt_get_target(entry);
573 builtin = is_hook_entry(table, entry);
575 if (entry_to_offset(table, entry) + entry->next_offset ==
576 table->blob_entries->size) {
577 connman_info("End of CHAIN 0x%x", offset);
581 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
582 connman_info("USER CHAIN (%s) %p match %p target %p size %d",
583 target->data, entry, entry->elems,
584 (char *)entry + entry->target_offset,
588 } else if (builtin >= 0) {
589 connman_info("CHAIN (%s) %p match %p target %p size %d",
590 hooknames[builtin], entry, entry->elems,
591 (char *)entry + entry->target_offset,
594 connman_info("RULE %p match %p target %p size %d", entry,
596 (char *)entry + entry->target_offset,
600 dump_match(table, entry);
601 dump_target(table, entry);
606 static void iptables_dump(struct connman_iptables *table)
608 connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
610 table->info->valid_hooks, table->info->num_entries,
613 ENTRY_ITERATE(table->blob_entries->entrytable,
614 table->blob_entries->size,
619 static int iptables_get_entries(struct connman_iptables *table)
621 socklen_t entry_size;
623 entry_size = sizeof(struct ipt_get_entries) + table->info->size;
625 return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
626 table->blob_entries, &entry_size);
629 static int iptables_replace(struct connman_iptables *table,
630 struct ipt_replace *r)
632 return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
633 sizeof(*r) + r->size);
636 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
638 struct ipt_entry *new_entry;
640 new_entry = g_try_malloc0(entry->next_offset);
641 if (new_entry == NULL)
644 memcpy(new_entry, entry, entry->next_offset);
646 return iptables_add_entry(table, new_entry, NULL);
649 static void table_cleanup(struct connman_iptables *table)
652 struct connman_iptables_entry *entry;
654 close(table->ipt_sock);
656 for (list = table->entries; list; list = list->next) {
659 g_free(entry->entry);
662 g_list_free(table->entries);
664 g_free(table->blob_entries);
668 static struct connman_iptables *iptables_init(char *table_name)
670 struct connman_iptables *table;
673 table = g_hash_table_lookup(table_hash, table_name);
677 table = g_try_new0(struct connman_iptables, 1);
681 table->info = g_try_new0(struct ipt_getinfo, 1);
682 if (table->info == NULL)
685 table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
686 if (table->ipt_sock < 0)
689 s = sizeof(*table->info);
690 strcpy(table->info->name, table_name);
691 if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
692 table->info, &s) < 0)
695 table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
697 if (table->blob_entries == NULL)
700 strcpy(table->blob_entries->name, table_name);
701 table->blob_entries->size = table->info->size;
703 if (iptables_get_entries(table) < 0)
706 table->num_entries = 0;
707 table->old_entries = table->info->num_entries;
710 ENTRY_ITERATE(table->blob_entries->entrytable,
711 table->blob_entries->size,
714 g_hash_table_insert(table_hash, table_name, table);
720 table_cleanup(table);
725 static struct option iptables_opts[] = {
726 {.name = "append", .has_arg = 1, .val = 'A'},
727 {.name = "list", .has_arg = 2, .val = 'L'},
728 {.name = "new-chain", .has_arg = 1, .val = 'N'},
729 {.name = "in-interface", .has_arg = 1, .val = 'i'},
730 {.name = "jump", .has_arg = 1, .val = 'j'},
731 {.name = "match", .has_arg = 1, .val = 'm'},
732 {.name = "out-interface", .has_arg = 1, .val = 'o'},
733 {.name = "table", .has_arg = 1, .val = 't'},
737 struct xtables_globals iptables_globals = {
739 .opts = iptables_opts,
740 .orig_opts = iptables_opts,
743 static int iptables_command(int argc, char *argv[])
745 struct connman_iptables *table;
746 struct xtables_match *xt_m;
747 struct xtables_target *xt_t;
748 char *table_name, *chain, *new_chain, *match_name, *target_name;
751 gboolean dump, invert;
758 table_name = chain = new_chain = match_name = target_name = NULL;
766 while ((c = getopt_long(argc, argv,
767 "-A:L::N:j:i:m:o:t:", iptables_globals.opts, NULL)) != -1) {
782 target_name = optarg;
783 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
788 size = ALIGN(sizeof(struct ipt_entry_target)) +
791 xt_t->t = g_try_malloc0(size);
794 xt_t->t->u.target_size = size;
795 strcpy(xt_t->t->u.user.name, target_name);
796 xt_t->t->u.user.revision = xt_t->revision;
797 if (xt_t->init != NULL)
799 iptables_globals.opts =
800 xtables_merge_options(iptables_globals.opts,
802 &xt_t->option_offset);
803 if (iptables_globals.opts == NULL)
814 xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
815 size = ALIGN(sizeof(struct ipt_entry_match)) +
817 xt_m->m = g_try_malloc0(size);
820 xt_m->m->u.match_size = size;
821 strcpy(xt_m->m->u.user.name, xt_m->name);
822 xt_m->m->u.user.revision = xt_m->revision;
823 if (xt_m->init != NULL)
825 if (xt_m != xt_m->next) {
826 iptables_globals.opts =
827 xtables_merge_options(iptables_globals.opts,
829 &xt_m->option_offset);
830 if (iptables_globals.opts == NULL)
844 if (optarg[0] == '!' && optarg[1] == '\0') {
850 connman_error("Invalid option");
856 if (xt_t == NULL || xt_t->parse == NULL ||
857 !xt_t->parse(c - xt_t->option_offset, argv, invert,
858 &xt_t->tflags, NULL, &xt_t->t)) {
859 if (xt_m == NULL || xt_m->parse == NULL)
862 xt_m->parse(c - xt_m->option_offset, argv,
863 invert, &xt_m->mflags, NULL, &xt_m->m);
870 if (table_name == NULL)
871 table_name = "filter";
873 table = iptables_init(table_name);
880 iptables_dump(table);
886 if (chain && new_chain) {
892 DBG("New chain %s", new_chain);
894 ret = iptables_add_chain(table, new_chain);
899 if (target_name == NULL)
902 DBG("Adding %s to %s (match %s)",
903 target_name, chain, match_name);
905 ret = iptables_add_rule(table, chain, target_name, xt_t,
921 int __connman_iptables_command(const char *format, ...)
923 char **argv, **arguments, *command;
930 va_start(args, format);
932 command = g_strdup_vprintf(format, args);
939 arguments = g_strsplit_set(command, " ", -1);
941 for (argc = 0; arguments[argc]; argc++);
943 DBG("command %s argc %d", command, ++argc);
945 argv = g_try_malloc0(argc * sizeof(char *));
948 g_strfreev(arguments);
952 argv[0] = "iptables";
953 for (i = 1; i < argc; i++)
954 argv[i] = arguments[i - 1];
956 ret = iptables_command(argc, argv);
959 g_strfreev(arguments);
966 int __connman_iptables_commit(const char *table_name)
968 struct connman_iptables *table;
969 struct ipt_replace *repl;
971 table = g_hash_table_lookup(table_hash, table_name);
975 repl = iptables_blob(table);
977 return iptables_replace(table, repl);
980 static void remove_table(gpointer user_data)
982 struct connman_iptables *table = user_data;
984 table_cleanup(table);
987 int __connman_iptables_init(void)
991 table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
994 xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1000 void __connman_iptables_cleanup(void)
1002 g_hash_table_destroy(table_hash);
1004 xtables_free_opts(1);