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_jump(struct connman_iptables_entry *e)
168 struct xt_entry_target *target;
170 target = ipt_get_target(e->entry);
172 if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
173 struct xt_standard_target *t;
175 t = (struct xt_standard_target *)target;
177 switch (t->verdict) {
193 static gboolean is_chain(struct connman_iptables *table,
194 struct connman_iptables_entry *e)
197 struct ipt_entry *entry;
198 struct xt_entry_target *target;
201 builtin = is_hook_entry(table, entry);
205 target = ipt_get_target(entry);
206 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
212 static GList *find_chain_head(struct connman_iptables *table,
216 struct connman_iptables_entry *head;
217 struct ipt_entry *entry;
218 struct xt_entry_target *target;
221 for (list = table->entries; list; list = list->next) {
226 builtin = is_hook_entry(table, entry);
227 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
230 /* User defined chain */
231 target = ipt_get_target(entry);
232 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
233 !strcmp((char *)target->data, chain_name))
240 static GList *find_chain_tail(struct connman_iptables *table,
243 GList *chain_head, *list;
244 struct connman_iptables_entry *head, *tail;
245 struct ipt_entry *entry;
246 struct xt_entry_target *target;
249 /* First we look for the head */
250 for (list = table->entries; list; list = list->next) {
255 builtin = is_hook_entry(table, entry);
256 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
259 /* User defined chain */
260 target = ipt_get_target(entry);
261 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
262 !strcmp((char *)target->data, chain_name))
271 /* Then we look for the next chain */
272 for (list = chain_head->next; list; list = list->next) {
276 if (is_chain(table, tail))
280 /* Nothing found, we return the table end */
281 return g_list_last(table->entries);
285 static void update_offsets(struct connman_iptables *table)
288 struct connman_iptables_entry *entry, *prev_entry;
290 for (list = table->entries; list; list = list->next) {
293 if (list == table->entries) {
300 prev_entry = prev->data;
302 entry->offset = prev_entry->offset +
303 prev_entry->entry->next_offset;
307 static int iptables_add_entry(struct connman_iptables *table,
308 struct ipt_entry *entry, GList *before)
311 struct connman_iptables_entry *e, *tmp, *entry_before;
312 struct xt_standard_target *t;
317 e = g_try_malloc0(sizeof(struct connman_iptables_entry));
323 table->entries = g_list_insert_before(table->entries, before, e);
324 table->num_entries++;
325 table->size += entry->next_offset;
327 if (before == NULL) {
328 e->offset = table->size - entry->next_offset;
333 entry_before = before->data;
336 * We've just insterted a new entry. All references before it
337 * should be bumped accordingly.
339 for (list = table->entries; list != before; list = list->next) {
345 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
347 if (t->verdict >= entry_before->offset)
348 t->verdict += entry->next_offset;
351 update_offsets(table);
356 static int iptables_add_chain(struct connman_iptables *table,
360 struct ipt_entry *entry_head;
361 struct ipt_entry *entry_return;
362 struct ipt_error_target *error;
363 struct ipt_standard_target *standard;
364 u_int16_t entry_head_size, entry_return_size;
366 last = g_list_last(table->entries);
369 * An empty chain is composed of:
370 * - A head entry, with no match and an error target.
371 * The error target data is the chain name.
372 * - A tail entry, with no match and a standard target.
373 * The standard target verdict is XT_RETURN (return to the
378 entry_head_size = sizeof(struct ipt_entry) +
379 sizeof(struct ipt_error_target);
380 entry_head = g_try_malloc0(entry_head_size);
381 if (entry_head == NULL)
384 memset(entry_head, 0, entry_head_size);
386 entry_head->target_offset = sizeof(struct ipt_entry);
387 entry_head->next_offset = entry_head_size;
389 error = (struct ipt_error_target *) entry_head->elems;
390 strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
391 error->t.u.user.target_size = ALIGN(sizeof(struct ipt_error_target));
392 strcpy(error->error, name);
394 if (iptables_add_entry(table, entry_head, last) < 0)
398 entry_return_size = sizeof(struct ipt_entry) +
399 sizeof(struct ipt_standard_target);
400 entry_return = g_try_malloc0(entry_return_size);
401 if (entry_return == NULL)
404 memset(entry_return, 0, entry_return_size);
406 entry_return->target_offset = sizeof(struct ipt_entry);
407 entry_return->next_offset = entry_return_size;
409 standard = (struct ipt_standard_target *) entry_return->elems;
410 standard->target.u.user.target_size =
411 ALIGN(sizeof(struct ipt_standard_target));
412 standard->verdict = XT_RETURN;
414 if (iptables_add_entry(table, entry_return, last) < 0)
421 g_free(entry_return);
426 static struct ipt_entry *
427 new_rule(struct connman_iptables *table,
428 char *target_name, struct xtables_target *xt_t,
429 char *match_name, struct xtables_match *xt_m)
431 struct ipt_entry *new_entry;
432 size_t match_size, target_size;
433 int is_builtin = is_builtin_target(target_name);
436 match_size = xt_m->m->u.match_size;
441 target_size = ALIGN(xt_t->t->u.target_size);
443 target_size = ALIGN(sizeof(struct xt_standard_target));
445 new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
447 if (new_entry == NULL)
450 new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
451 new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
454 struct xt_entry_match *entry_match;
456 entry_match = (struct xt_entry_match *)new_entry->elems;
457 memcpy(entry_match, xt_m->m, match_size);
461 struct xt_entry_target *entry_target;
464 struct xt_standard_target *target;
466 target = (struct xt_standard_target *)(xt_t->t);
467 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
468 target->verdict = target_to_verdict(target_name);
471 entry_target = ipt_get_target(new_entry);
472 memcpy(entry_target, xt_t->t, target_size);
474 struct connman_iptables_entry *target_rule;
475 struct xt_standard_target *target;
479 * This is a user defined target, i.e. a chain jump.
480 * We search for the chain head, and the target verdict
481 * is the first rule's offset on this chain.
482 * The offset is from the beginning of the table.
485 chain_head = find_chain_head(table, target_name);
486 if (chain_head == NULL || chain_head->next == NULL) {
491 target_rule = chain_head->next->data;
493 target = (struct xt_standard_target *)ipt_get_target(new_entry);
494 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
495 target->target.u.user.target_size = target_size;
496 target->verdict = target_rule->offset;
503 iptables_add_rule(struct connman_iptables *table, char *chain_name,
504 char *target_name, struct xtables_target *xt_t,
505 char *match_name, struct xtables_match *xt_m)
508 struct ipt_entry *new_entry;
510 chain_tail = find_chain_tail(table, chain_name);
511 if (chain_tail == NULL)
514 new_entry = new_rule(table,
517 if (new_entry == NULL)
520 return iptables_add_entry(table, new_entry, chain_tail->prev);
523 static struct ipt_replace *
524 iptables_blob(struct connman_iptables *table)
526 struct ipt_replace *r;
528 struct connman_iptables_entry *e;
529 unsigned char *entry_index;
531 r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
535 memset(r, 0, sizeof(*r) + table->size);
537 r->counters = g_try_malloc0(sizeof(struct xt_counters)
538 * table->num_entries);
539 if (r->counters == NULL) {
544 strcpy(r->name, table->info->name);
545 r->num_entries = table->num_entries;
546 r->size = table->size;
548 r->num_counters = table->old_entries;
549 r->valid_hooks = table->info->valid_hooks;
551 memcpy(r->hook_entry, table->info->hook_entry,
552 sizeof(table->info->hook_entry));
553 memcpy(r->underflow, table->info->underflow,
554 sizeof(table->info->underflow));
556 entry_index = (unsigned char *)r->entries;
557 for (list = table->entries; list; list = list->next) {
560 memcpy(entry_index, e->entry, e->entry->next_offset);
561 entry_index += e->entry->next_offset;
567 static void dump_target(struct connman_iptables *table,
568 struct ipt_entry *entry)
571 struct xtables_target *xt_t;
572 struct xt_entry_target *target;
574 target = ipt_get_target(entry);
576 if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
577 struct xt_standard_target *t;
579 t = (struct xt_standard_target *)target;
581 switch (t->verdict) {
583 connman_info("\ttarget RETURN");
587 connman_info("\ttarget ACCEPT");
591 connman_info("\ttarget DROP");
595 connman_info("\ttarget QUEUE");
599 connman_info("\ttarget STOP");
603 connman_info("\tJUMP @%p (0x%x)",
604 (char*)table->blob_entries->entrytable +
605 t->verdict, t->verdict);
609 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
610 XTF_LOAD_MUST_SUCCEED);
612 if(xt_t->print != NULL)
613 xt_t->print(NULL, target, 1);
615 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
617 connman_info("\ttarget %s", target->u.user.name);
621 if(xt_t->print != NULL) {
622 connman_info("\ttarget ");
623 xt_t->print(NULL, target, 1);
628 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
630 struct xtables_match *xt_m;
631 struct xt_entry_match *match;
633 if (entry->elems == (unsigned char *)entry + entry->target_offset)
636 match = (struct xt_entry_match *) entry->elems;
638 if (!strlen(match->u.user.name))
641 xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
645 if(xt_m->print != NULL) {
646 connman_info("\tmatch ");
647 xt_m->print(NULL, match, 1);
653 connman_info("\tmatch %s", match->u.user.name);
657 static int dump_entry(struct ipt_entry *entry,
658 struct connman_iptables *table)
660 struct xt_entry_target *target;
664 offset = (char *)entry - (char *)table->blob_entries->entrytable;
665 target = ipt_get_target(entry);
666 builtin = is_hook_entry(table, entry);
668 if (entry_to_offset(table, entry) + entry->next_offset ==
669 table->blob_entries->size) {
670 connman_info("End of CHAIN 0x%x", offset);
674 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
675 connman_info("USER CHAIN (%s) %p match %p target %p size %d",
676 target->data, entry, entry->elems,
677 (char *)entry + entry->target_offset,
681 } else if (builtin >= 0) {
682 connman_info("CHAIN (%s) %p match %p target %p size %d",
683 hooknames[builtin], entry, entry->elems,
684 (char *)entry + entry->target_offset,
687 connman_info("RULE %p match %p target %p size %d", entry,
689 (char *)entry + entry->target_offset,
693 dump_match(table, entry);
694 dump_target(table, entry);
699 static void iptables_dump(struct connman_iptables *table)
701 connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
703 table->info->valid_hooks, table->info->num_entries,
706 ENTRY_ITERATE(table->blob_entries->entrytable,
707 table->blob_entries->size,
712 static int iptables_get_entries(struct connman_iptables *table)
714 socklen_t entry_size;
716 entry_size = sizeof(struct ipt_get_entries) + table->info->size;
718 return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
719 table->blob_entries, &entry_size);
722 static int iptables_replace(struct connman_iptables *table,
723 struct ipt_replace *r)
725 return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
726 sizeof(*r) + r->size);
729 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
731 struct ipt_entry *new_entry;
733 new_entry = g_try_malloc0(entry->next_offset);
734 if (new_entry == NULL)
737 memcpy(new_entry, entry, entry->next_offset);
739 return iptables_add_entry(table, new_entry, NULL);
742 static void table_cleanup(struct connman_iptables *table)
745 struct connman_iptables_entry *entry;
747 close(table->ipt_sock);
749 for (list = table->entries; list; list = list->next) {
752 g_free(entry->entry);
755 g_list_free(table->entries);
757 g_free(table->blob_entries);
761 static struct connman_iptables *iptables_init(char *table_name)
763 struct connman_iptables *table;
766 table = g_hash_table_lookup(table_hash, table_name);
770 table = g_try_new0(struct connman_iptables, 1);
774 table->info = g_try_new0(struct ipt_getinfo, 1);
775 if (table->info == NULL)
778 table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
779 if (table->ipt_sock < 0)
782 s = sizeof(*table->info);
783 strcpy(table->info->name, table_name);
784 if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
785 table->info, &s) < 0)
788 table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
790 if (table->blob_entries == NULL)
793 strcpy(table->blob_entries->name, table_name);
794 table->blob_entries->size = table->info->size;
796 if (iptables_get_entries(table) < 0)
799 table->num_entries = 0;
800 table->old_entries = table->info->num_entries;
803 ENTRY_ITERATE(table->blob_entries->entrytable,
804 table->blob_entries->size,
807 g_hash_table_insert(table_hash, table_name, table);
813 table_cleanup(table);
818 static struct option iptables_opts[] = {
819 {.name = "append", .has_arg = 1, .val = 'A'},
820 {.name = "list", .has_arg = 2, .val = 'L'},
821 {.name = "new-chain", .has_arg = 1, .val = 'N'},
822 {.name = "in-interface", .has_arg = 1, .val = 'i'},
823 {.name = "jump", .has_arg = 1, .val = 'j'},
824 {.name = "match", .has_arg = 1, .val = 'm'},
825 {.name = "out-interface", .has_arg = 1, .val = 'o'},
826 {.name = "table", .has_arg = 1, .val = 't'},
830 struct xtables_globals iptables_globals = {
832 .opts = iptables_opts,
833 .orig_opts = iptables_opts,
836 static int iptables_command(int argc, char *argv[])
838 struct connman_iptables *table;
839 struct xtables_match *xt_m;
840 struct xtables_target *xt_t;
841 char *table_name, *chain, *new_chain, *match_name, *target_name;
844 gboolean dump, invert;
851 table_name = chain = new_chain = match_name = target_name = NULL;
859 while ((c = getopt_long(argc, argv,
860 "-A:L::N:j:i:m:o:t:", iptables_globals.opts, NULL)) != -1) {
875 target_name = optarg;
876 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
881 size = ALIGN(sizeof(struct ipt_entry_target)) +
884 xt_t->t = g_try_malloc0(size);
887 xt_t->t->u.target_size = size;
888 strcpy(xt_t->t->u.user.name, target_name);
889 xt_t->t->u.user.revision = xt_t->revision;
890 if (xt_t->init != NULL)
892 iptables_globals.opts =
893 xtables_merge_options(iptables_globals.opts,
895 &xt_t->option_offset);
896 if (iptables_globals.opts == NULL)
907 xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
908 size = ALIGN(sizeof(struct ipt_entry_match)) +
910 xt_m->m = g_try_malloc0(size);
913 xt_m->m->u.match_size = size;
914 strcpy(xt_m->m->u.user.name, xt_m->name);
915 xt_m->m->u.user.revision = xt_m->revision;
916 if (xt_m->init != NULL)
918 if (xt_m != xt_m->next) {
919 iptables_globals.opts =
920 xtables_merge_options(iptables_globals.opts,
922 &xt_m->option_offset);
923 if (iptables_globals.opts == NULL)
937 if (optarg[0] == '!' && optarg[1] == '\0') {
943 connman_error("Invalid option");
949 if (xt_t == NULL || xt_t->parse == NULL ||
950 !xt_t->parse(c - xt_t->option_offset, argv, invert,
951 &xt_t->tflags, NULL, &xt_t->t)) {
952 if (xt_m == NULL || xt_m->parse == NULL)
955 xt_m->parse(c - xt_m->option_offset, argv,
956 invert, &xt_m->mflags, NULL, &xt_m->m);
963 if (table_name == NULL)
964 table_name = "filter";
966 table = iptables_init(table_name);
973 iptables_dump(table);
979 if (chain && new_chain) {
985 DBG("New chain %s", new_chain);
987 ret = iptables_add_chain(table, new_chain);
992 if (target_name == NULL)
995 DBG("Adding %s to %s (match %s)",
996 target_name, chain, match_name);
998 ret = iptables_add_rule(table, chain, target_name, xt_t,
1014 int __connman_iptables_command(const char *format, ...)
1016 char **argv, **arguments, *command;
1023 va_start(args, format);
1025 command = g_strdup_vprintf(format, args);
1029 if (command == NULL)
1032 arguments = g_strsplit_set(command, " ", -1);
1034 for (argc = 0; arguments[argc]; argc++);
1036 DBG("command %s argc %d", command, ++argc);
1038 argv = g_try_malloc0(argc * sizeof(char *));
1041 g_strfreev(arguments);
1045 argv[0] = "iptables";
1046 for (i = 1; i < argc; i++)
1047 argv[i] = arguments[i - 1];
1049 ret = iptables_command(argc, argv);
1052 g_strfreev(arguments);
1059 int __connman_iptables_commit(const char *table_name)
1061 struct connman_iptables *table;
1062 struct ipt_replace *repl;
1064 table = g_hash_table_lookup(table_hash, table_name);
1068 repl = iptables_blob(table);
1070 return iptables_replace(table, repl);
1073 static void remove_table(gpointer user_data)
1075 struct connman_iptables *table = user_data;
1077 table_cleanup(table);
1080 int __connman_iptables_init(void)
1084 table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1085 NULL, remove_table);
1087 xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1093 void __connman_iptables_cleanup(void)
1095 g_hash_table_destroy(table_hash);
1097 xtables_free_opts(1);