5 * Copyright (C) 2007-2011 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 #define XT_OPTION_OFFSET_SCALE 256
55 /* fn returns 0 to continue iteration */
56 #define _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
63 for (__i = 0, __n = 0; __i < (size); \
64 __i += __entry->next_offset, __n++) { \
65 __entry = (void *)(entries) + __i; \
69 __ret = fn(__entry, ## args); \
76 /* fn returns 0 to continue iteration */
77 #define _XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
78 _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
80 #define ENTRY_ITERATE(entries, size, fn, args...) \
81 _XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
83 #define MIN_ALIGN (__alignof__(struct ipt_entry))
85 #define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
88 struct xt_entry_target t;
89 char error[IPT_TABLE_MAXNAMELEN];
92 struct connman_iptables_entry {
96 struct ipt_entry *entry;
99 struct connman_iptables {
102 struct ipt_getinfo *info;
103 struct ipt_get_entries *blob_entries;
105 unsigned int num_entries;
106 unsigned int old_entries;
109 unsigned int underflow[NF_INET_NUMHOOKS];
110 unsigned int hook_entry[NF_INET_NUMHOOKS];
115 static GHashTable *table_hash = NULL;
117 static struct ipt_entry *get_entry(struct connman_iptables *table,
120 return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
124 static int is_hook_entry(struct connman_iptables *table,
125 struct ipt_entry *entry)
129 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
130 if ((table->info->valid_hooks & (1 << i))
131 && get_entry(table, table->info->hook_entry[i]) == entry)
138 static unsigned long entry_to_offset(struct connman_iptables *table,
139 struct ipt_entry *entry)
141 return (void *)entry - (void *)table->blob_entries->entrytable;
144 static int target_to_verdict(char *target_name)
146 if (!strcmp(target_name, LABEL_ACCEPT))
147 return -NF_ACCEPT - 1;
149 if (!strcmp(target_name, LABEL_DROP))
152 if (!strcmp(target_name, LABEL_QUEUE))
153 return -NF_QUEUE - 1;
155 if (!strcmp(target_name, LABEL_RETURN))
161 static gboolean is_builtin_target(char *target_name)
163 if (!strcmp(target_name, LABEL_ACCEPT) ||
164 !strcmp(target_name, LABEL_DROP) ||
165 !strcmp(target_name, LABEL_QUEUE) ||
166 !strcmp(target_name, LABEL_RETURN))
172 static gboolean is_jump(struct connman_iptables_entry *e)
174 struct xt_entry_target *target;
176 target = ipt_get_target(e->entry);
178 if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
179 struct xt_standard_target *t;
181 t = (struct xt_standard_target *)target;
183 switch (t->verdict) {
199 static gboolean is_chain(struct connman_iptables *table,
200 struct connman_iptables_entry *e)
202 struct ipt_entry *entry;
203 struct xt_entry_target *target;
209 target = ipt_get_target(entry);
210 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
216 static GList *find_chain_head(struct connman_iptables *table,
220 struct connman_iptables_entry *head;
221 struct ipt_entry *entry;
222 struct xt_entry_target *target;
225 for (list = table->entries; list; list = list->next) {
230 builtin = head->builtin;
231 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
234 /* User defined chain */
235 target = ipt_get_target(entry);
236 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
237 !strcmp((char *)target->data, chain_name))
244 static GList *find_chain_tail(struct connman_iptables *table,
247 struct connman_iptables_entry *tail;
248 GList *chain_head, *list;
250 chain_head = find_chain_head(table, chain_name);
251 if (chain_head == NULL)
254 /* Then we look for the next chain */
255 for (list = chain_head->next; list; list = list->next) {
258 if (is_chain(table, tail))
262 /* Nothing found, we return the table end */
263 return g_list_last(table->entries);
267 static void update_offsets(struct connman_iptables *table)
270 struct connman_iptables_entry *entry, *prev_entry;
272 for (list = table->entries; list; list = list->next) {
275 if (list == table->entries) {
282 prev_entry = prev->data;
284 entry->offset = prev_entry->offset +
285 prev_entry->entry->next_offset;
289 static void update_targets_reference(struct connman_iptables *table,
290 struct connman_iptables_entry *entry_before,
291 struct connman_iptables_entry *modified_entry,
292 gboolean is_removing)
294 struct connman_iptables_entry *tmp;
295 struct xt_standard_target *t;
299 offset = modified_entry->entry->next_offset;
301 for (list = table->entries; list; list = list->next) {
307 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
309 if (is_removing == TRUE) {
310 if (t->verdict >= entry_before->offset)
311 t->verdict -= offset;
313 if (t->verdict > entry_before->offset)
314 t->verdict += offset;
319 static int iptables_add_entry(struct connman_iptables *table,
320 struct ipt_entry *entry, GList *before,
323 struct connman_iptables_entry *e, *entry_before;
328 e = g_try_malloc0(sizeof(struct connman_iptables_entry));
333 e->builtin = builtin;
335 table->entries = g_list_insert_before(table->entries, before, e);
336 table->num_entries++;
337 table->size += entry->next_offset;
339 if (before == NULL) {
340 e->offset = table->size - entry->next_offset;
345 entry_before = before->data;
348 * We've just appended/insterted a new entry. All references
349 * should be bumped accordingly.
351 update_targets_reference(table, entry_before, e, FALSE);
353 update_offsets(table);
358 static int remove_table_entry(struct connman_iptables *table,
359 struct connman_iptables_entry *entry)
363 table->num_entries--;
364 table->size -= entry->entry->next_offset;
365 removed = entry->entry->next_offset;
367 g_free(entry->entry);
369 table->entries = g_list_remove(table->entries, entry);
374 static int iptables_flush_chain(struct connman_iptables *table,
377 GList *chain_head, *chain_tail, *list, *next;
378 struct connman_iptables_entry *entry;
379 int builtin, removed = 0;
381 chain_head = find_chain_head(table, name);
382 if (chain_head == NULL)
385 chain_tail = find_chain_tail(table, name);
386 if (chain_tail == NULL)
389 entry = chain_head->data;
390 builtin = entry->builtin;
395 list = chain_head->next;
397 if (list == chain_tail->prev)
400 while (list != chain_tail->prev) {
402 next = g_list_next(list);
404 removed += remove_table_entry(table, entry);
410 struct connman_iptables_entry *e;
414 entry->builtin = builtin;
416 table->underflow[builtin] -= removed;
418 for (list = chain_tail; list; list = list->next) {
421 builtin = e->builtin;
425 table->hook_entry[builtin] -= removed;
426 table->underflow[builtin] -= removed;
430 update_offsets(table);
435 static int iptables_add_chain(struct connman_iptables *table,
439 struct ipt_entry *entry_head;
440 struct ipt_entry *entry_return;
441 struct error_target *error;
442 struct ipt_standard_target *standard;
443 u_int16_t entry_head_size, entry_return_size;
445 last = g_list_last(table->entries);
448 * An empty chain is composed of:
449 * - A head entry, with no match and an error target.
450 * The error target data is the chain name.
451 * - A tail entry, with no match and a standard target.
452 * The standard target verdict is XT_RETURN (return to the
457 entry_head_size = sizeof(struct ipt_entry) +
458 sizeof(struct error_target);
459 entry_head = g_try_malloc0(entry_head_size);
460 if (entry_head == NULL)
463 memset(entry_head, 0, entry_head_size);
465 entry_head->target_offset = sizeof(struct ipt_entry);
466 entry_head->next_offset = entry_head_size;
468 error = (struct error_target *) entry_head->elems;
469 strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
470 error->t.u.user.target_size = ALIGN(sizeof(struct error_target));
471 strcpy(error->error, name);
473 if (iptables_add_entry(table, entry_head, last, -1) < 0)
477 entry_return_size = sizeof(struct ipt_entry) +
478 sizeof(struct ipt_standard_target);
479 entry_return = g_try_malloc0(entry_return_size);
480 if (entry_return == NULL)
483 memset(entry_return, 0, entry_return_size);
485 entry_return->target_offset = sizeof(struct ipt_entry);
486 entry_return->next_offset = entry_return_size;
488 standard = (struct ipt_standard_target *) entry_return->elems;
489 standard->target.u.user.target_size =
490 ALIGN(sizeof(struct ipt_standard_target));
491 standard->verdict = XT_RETURN;
493 if (iptables_add_entry(table, entry_return, last, -1) < 0)
499 g_free(entry_return);
506 static int iptables_delete_chain(struct connman_iptables *table, char *name)
508 struct connman_iptables_entry *entry;
509 GList *chain_head, *chain_tail;
511 chain_head = find_chain_head(table, name);
512 if (chain_head == NULL)
515 entry = chain_head->data;
517 /* We cannot remove builtin chain */
518 if (entry->builtin >= 0)
521 chain_tail = find_chain_tail(table, name);
522 if (chain_tail == NULL)
525 /* Chain must be flushed */
526 if (chain_head->next != chain_tail->prev)
529 remove_table_entry(table, entry);
531 entry = chain_tail->prev->data;
532 remove_table_entry(table, entry);
534 update_offsets(table);
539 static struct ipt_entry *new_rule(struct ipt_ip *ip,
540 char *target_name, struct xtables_target *xt_t,
541 char *match_name, struct xtables_match *xt_m)
543 struct ipt_entry *new_entry;
544 size_t match_size, target_size;
547 match_size = xt_m->m->u.match_size;
552 target_size = ALIGN(xt_t->t->u.target_size);
554 target_size = ALIGN(sizeof(struct xt_standard_target));
556 new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
558 if (new_entry == NULL)
561 memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
563 new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
564 new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
567 struct xt_entry_match *entry_match;
569 entry_match = (struct xt_entry_match *)new_entry->elems;
570 memcpy(entry_match, xt_m->m, match_size);
574 struct xt_entry_target *entry_target;
576 entry_target = ipt_get_target(new_entry);
577 memcpy(entry_target, xt_t->t, target_size);
583 static void update_hooks(struct connman_iptables *table, GList *chain_head,
584 struct ipt_entry *entry)
587 struct connman_iptables_entry *head, *e;
590 if (chain_head == NULL)
593 head = chain_head->data;
595 builtin = head->builtin;
599 table->underflow[builtin] += entry->next_offset;
601 for (list = chain_head->next; list; list = list->next) {
604 builtin = e->builtin;
608 table->hook_entry[builtin] += entry->next_offset;
609 table->underflow[builtin] += entry->next_offset;
613 static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
614 struct ipt_ip *ip, char *chain_name,
615 char *target_name, struct xtables_target *xt_t,
616 char *match_name, struct xtables_match *xt_m,
619 GList *chain_tail, *chain_head;
620 struct ipt_entry *new_entry;
621 struct connman_iptables_entry *head;
623 chain_head = find_chain_head(table, chain_name);
624 if (chain_head == NULL)
627 chain_tail = find_chain_tail(table, chain_name);
628 if (chain_tail == NULL)
631 new_entry = new_rule(ip, target_name, xt_t, match_name, xt_m);
632 if (new_entry == NULL)
635 update_hooks(table, chain_head, new_entry);
638 * If the chain is builtin, and does not have any rule,
639 * then the one that we're inserting is becoming the head
640 * and thus needs the builtin flag.
642 head = chain_head->data;
643 if (head->builtin < 0)
645 else if (chain_head == chain_tail->prev) {
646 *builtin = head->builtin;
653 static int iptables_append_rule(struct connman_iptables *table,
654 struct ipt_ip *ip, char *chain_name,
655 char *target_name, struct xtables_target *xt_t,
656 char *match_name, struct xtables_match *xt_m)
659 struct ipt_entry *new_entry;
660 int builtin = -1, ret;
664 chain_tail = find_chain_tail(table, chain_name);
665 if (chain_tail == NULL)
668 new_entry = prepare_rule_inclusion(table, ip, chain_name,
669 target_name, xt_t, match_name, xt_m, &builtin);
670 if (new_entry == NULL)
673 ret = iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
680 static int iptables_insert_rule(struct connman_iptables *table,
681 struct ipt_ip *ip, char *chain_name,
682 char *target_name, struct xtables_target *xt_t,
683 char *match_name, struct xtables_match *xt_m)
685 struct ipt_entry *new_entry;
686 int builtin = -1, ret;
689 chain_head = find_chain_head(table, chain_name);
690 if (chain_head == NULL)
693 new_entry = prepare_rule_inclusion(table, ip, chain_name,
694 target_name, xt_t, match_name, xt_m, &builtin);
695 if (new_entry == NULL)
698 ret = iptables_add_entry(table, new_entry, chain_head->next, builtin);
705 static gboolean is_same_ipt_entry(struct ipt_entry *i_e1,
706 struct ipt_entry *i_e2)
708 if (memcmp(&i_e1->ip, &i_e2->ip, sizeof(struct ipt_ip)) != 0)
711 if (i_e1->target_offset != i_e2->target_offset)
714 if (i_e1->next_offset != i_e2->next_offset)
720 static gboolean is_same_target(struct xt_entry_target *xt_e_t1,
721 struct xt_entry_target *xt_e_t2)
723 if (xt_e_t1 == NULL || xt_e_t2 == NULL)
726 if (strcmp(xt_e_t1->u.user.name, IPT_STANDARD_TARGET) == 0) {
727 struct xt_standard_target *xt_s_t1;
728 struct xt_standard_target *xt_s_t2;
730 xt_s_t1 = (struct xt_standard_target *) xt_e_t1;
731 xt_s_t2 = (struct xt_standard_target *) xt_e_t2;
733 if (xt_s_t1->verdict != xt_s_t2->verdict)
736 if (xt_e_t1->u.target_size != xt_e_t2->u.target_size)
739 if (strcmp(xt_e_t1->u.user.name, xt_e_t2->u.user.name) != 0)
746 static gboolean is_same_match(struct xt_entry_match *xt_e_m1,
747 struct xt_entry_match *xt_e_m2)
749 if (xt_e_m1 == NULL || xt_e_m2 == NULL)
752 if (xt_e_m1->u.match_size != xt_e_m2->u.match_size)
755 if (xt_e_m1->u.user.revision != xt_e_m2->u.user.revision)
758 if (strcmp(xt_e_m1->u.user.name, xt_e_m2->u.user.name) != 0)
764 static int iptables_delete_rule(struct connman_iptables *table,
765 struct ipt_ip *ip, char *chain_name,
766 char *target_name, struct xtables_target *xt_t,
767 char *match_name, struct xtables_match *xt_m)
769 GList *chain_tail, *chain_head, *list;
770 struct xt_entry_target *xt_e_t = NULL;
771 struct xt_entry_match *xt_e_m = NULL;
772 struct connman_iptables_entry *entry;
773 struct ipt_entry *entry_test;
774 int builtin, removed;
778 chain_head = find_chain_head(table, chain_name);
779 if (chain_head == NULL)
782 chain_tail = find_chain_tail(table, chain_name);
783 if (chain_tail == NULL)
789 entry_test = new_rule(ip, target_name, xt_t, match_name, xt_m);
790 if (entry_test == NULL)
794 xt_e_t = ipt_get_target(entry_test);
796 xt_e_m = (struct xt_entry_match *)entry_test->elems;
798 entry = chain_head->data;
799 builtin = entry->builtin;
804 list = chain_head->next;
806 for (entry = NULL; list != chain_tail->prev; list = list->next) {
807 struct connman_iptables_entry *tmp;
808 struct ipt_entry *tmp_e;
813 if (is_same_ipt_entry(entry_test, tmp_e) == FALSE)
817 struct xt_entry_target *tmp_xt_e_t;
819 tmp_xt_e_t = ipt_get_target(tmp_e);
821 if (!is_same_target(tmp_xt_e_t, xt_e_t))
826 struct xt_entry_match *tmp_xt_e_m;
828 tmp_xt_e_m = (struct xt_entry_match *)tmp_e->elems;
830 if (!is_same_match(tmp_xt_e_m, xt_e_m))
843 /* We have deleted a rule,
844 * all references should be bumped accordingly */
845 if (list->next != NULL)
846 update_targets_reference(table, list->next->data,
849 removed += remove_table_entry(table, entry);
855 entry->builtin = builtin;
858 table->underflow[builtin] -= removed;
859 for (list = chain_tail; list; list = list->next) {
862 builtin = entry->builtin;
866 table->hook_entry[builtin] -= removed;
867 table->underflow[builtin] -= removed;
871 update_offsets(table);
876 static struct ipt_replace *iptables_blob(struct connman_iptables *table)
878 struct ipt_replace *r;
880 struct connman_iptables_entry *e;
881 unsigned char *entry_index;
883 r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
887 memset(r, 0, sizeof(*r) + table->size);
889 r->counters = g_try_malloc0(sizeof(struct xt_counters)
890 * table->old_entries);
891 if (r->counters == NULL) {
896 strcpy(r->name, table->info->name);
897 r->num_entries = table->num_entries;
898 r->size = table->size;
900 r->num_counters = table->old_entries;
901 r->valid_hooks = table->info->valid_hooks;
903 memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
904 memcpy(r->underflow, table->underflow, sizeof(table->underflow));
906 entry_index = (unsigned char *)r->entries;
907 for (list = table->entries; list; list = list->next) {
910 memcpy(entry_index, e->entry, e->entry->next_offset);
911 entry_index += e->entry->next_offset;
917 static void dump_ip(struct ipt_entry *entry)
919 struct ipt_ip *ip = &entry->ip;
920 char ip_string[INET6_ADDRSTRLEN];
921 char ip_mask[INET6_ADDRSTRLEN];
923 if (strlen(ip->iniface))
924 connman_info("\tin %s", ip->iniface);
926 if (strlen(ip->outiface))
927 connman_info("\tout %s", ip->outiface);
929 if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
930 inet_ntop(AF_INET, &ip->smsk,
931 ip_mask, INET6_ADDRSTRLEN) != NULL)
932 connman_info("\tsrc %s/%s", ip_string, ip_mask);
934 if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
935 inet_ntop(AF_INET, &ip->dmsk,
936 ip_mask, INET6_ADDRSTRLEN) != NULL)
937 connman_info("\tdst %s/%s", ip_string, ip_mask);
940 static void dump_target(struct connman_iptables *table,
941 struct ipt_entry *entry)
944 struct xtables_target *xt_t;
945 struct xt_entry_target *target;
947 target = ipt_get_target(entry);
949 if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
950 struct xt_standard_target *t;
952 t = (struct xt_standard_target *)target;
954 switch (t->verdict) {
956 connman_info("\ttarget RETURN");
960 connman_info("\ttarget ACCEPT");
964 connman_info("\ttarget DROP");
968 connman_info("\ttarget QUEUE");
972 connman_info("\ttarget STOP");
976 connman_info("\tJUMP @%p (0x%x)",
977 (char*)table->blob_entries->entrytable +
978 t->verdict, t->verdict);
982 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
983 XTF_LOAD_MUST_SUCCEED);
985 if(xt_t->print != NULL)
986 xt_t->print(NULL, target, 1);
988 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
990 connman_info("\ttarget %s", target->u.user.name);
994 if(xt_t->print != NULL) {
995 connman_info("\ttarget ");
996 xt_t->print(NULL, target, 1);
1001 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
1003 struct xtables_match *xt_m;
1004 struct xt_entry_match *match;
1006 if (entry->elems == (unsigned char *)entry + entry->target_offset)
1009 match = (struct xt_entry_match *) entry->elems;
1011 if (!strlen(match->u.user.name))
1014 xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
1018 if(xt_m->print != NULL) {
1019 connman_info("\tmatch ");
1020 xt_m->print(NULL, match, 1);
1026 connman_info("\tmatch %s", match->u.user.name);
1030 static int dump_entry(struct ipt_entry *entry,
1031 struct connman_iptables *table)
1033 struct xt_entry_target *target;
1034 unsigned int offset;
1037 offset = (char *)entry - (char *)table->blob_entries->entrytable;
1038 target = ipt_get_target(entry);
1039 builtin = is_hook_entry(table, entry);
1041 if (entry_to_offset(table, entry) + entry->next_offset ==
1042 table->blob_entries->size) {
1043 connman_info("End of CHAIN 0x%x", offset);
1047 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
1048 connman_info("USER CHAIN (%s) %p match %p target %p size %d",
1049 target->data, entry, entry->elems,
1050 (char *)entry + entry->target_offset,
1051 entry->next_offset);
1054 } else if (builtin >= 0) {
1055 connman_info("CHAIN (%s) %p match %p target %p size %d",
1056 hooknames[builtin], entry, entry->elems,
1057 (char *)entry + entry->target_offset,
1058 entry->next_offset);
1060 connman_info("RULE %p match %p target %p size %d", entry,
1062 (char *)entry + entry->target_offset,
1063 entry->next_offset);
1066 dump_match(table, entry);
1067 dump_target(table, entry);
1073 static void iptables_dump(struct connman_iptables *table)
1075 connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
1077 table->info->valid_hooks, table->info->num_entries,
1080 ENTRY_ITERATE(table->blob_entries->entrytable,
1081 table->blob_entries->size,
1086 static int iptables_get_entries(struct connman_iptables *table)
1088 socklen_t entry_size;
1090 entry_size = sizeof(struct ipt_get_entries) + table->info->size;
1092 return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
1093 table->blob_entries, &entry_size);
1096 static int iptables_replace(struct connman_iptables *table,
1097 struct ipt_replace *r)
1099 return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
1100 sizeof(*r) + r->size);
1103 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
1105 struct ipt_entry *new_entry;
1108 new_entry = g_try_malloc0(entry->next_offset);
1109 if (new_entry == NULL)
1112 memcpy(new_entry, entry, entry->next_offset);
1114 builtin = is_hook_entry(table, entry);
1116 return iptables_add_entry(table, new_entry, NULL, builtin);
1119 static void table_cleanup(struct connman_iptables *table)
1122 struct connman_iptables_entry *entry;
1124 close(table->ipt_sock);
1126 for (list = table->entries; list; list = list->next) {
1129 g_free(entry->entry);
1133 g_list_free(table->entries);
1134 g_free(table->info);
1135 g_free(table->blob_entries);
1139 static struct connman_iptables *iptables_init(char *table_name)
1141 struct connman_iptables *table = NULL;
1142 char *module = NULL;
1145 DBG("%s", table_name);
1147 if (xtables_insmod("ip_tables", NULL, TRUE) != 0)
1150 module = g_strconcat("iptable_", table_name, NULL);
1154 if (xtables_insmod(module, NULL, TRUE) != 0)
1160 table = g_hash_table_lookup(table_hash, table_name);
1164 table = g_try_new0(struct connman_iptables, 1);
1168 table->info = g_try_new0(struct ipt_getinfo, 1);
1169 if (table->info == NULL)
1172 table->ipt_sock = socket(AF_INET, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW);
1173 if (table->ipt_sock < 0)
1176 s = sizeof(*table->info);
1177 strcpy(table->info->name, table_name);
1178 if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
1179 table->info, &s) < 0)
1182 table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
1184 if (table->blob_entries == NULL)
1187 strcpy(table->blob_entries->name, table_name);
1188 table->blob_entries->size = table->info->size;
1190 if (iptables_get_entries(table) < 0)
1193 table->num_entries = 0;
1194 table->old_entries = table->info->num_entries;
1197 memcpy(table->underflow, table->info->underflow,
1198 sizeof(table->info->underflow));
1199 memcpy(table->hook_entry, table->info->hook_entry,
1200 sizeof(table->info->hook_entry));
1202 ENTRY_ITERATE(table->blob_entries->entrytable,
1203 table->blob_entries->size,
1206 g_hash_table_insert(table_hash, g_strdup(table_name), table);
1213 table_cleanup(table);
1218 static struct option iptables_opts[] = {
1219 {.name = "append", .has_arg = 1, .val = 'A'},
1220 {.name = "delete", .has_arg = 1, .val = 'D'},
1221 {.name = "flush-chain", .has_arg = 1, .val = 'F'},
1222 {.name = "insert", .has_arg = 1, .val = 'I'},
1223 {.name = "list", .has_arg = 2, .val = 'L'},
1224 {.name = "new-chain", .has_arg = 1, .val = 'N'},
1225 {.name = "delete-chain", .has_arg = 1, .val = 'X'},
1226 {.name = "destination", .has_arg = 1, .val = 'd'},
1227 {.name = "in-interface", .has_arg = 1, .val = 'i'},
1228 {.name = "jump", .has_arg = 1, .val = 'j'},
1229 {.name = "match", .has_arg = 1, .val = 'm'},
1230 {.name = "out-interface", .has_arg = 1, .val = 'o'},
1231 {.name = "source", .has_arg = 1, .val = 's'},
1232 {.name = "table", .has_arg = 1, .val = 't'},
1236 struct xtables_globals iptables_globals = {
1238 .opts = iptables_opts,
1239 .orig_opts = iptables_opts,
1242 static struct xtables_target *prepare_target(struct connman_iptables *table,
1245 struct xtables_target *xt_t = NULL;
1246 gboolean is_builtin, is_user_defined;
1247 GList *chain_head = NULL;
1251 is_user_defined = FALSE;
1253 if (is_builtin_target(target_name))
1256 chain_head = find_chain_head(table, target_name);
1257 if (chain_head != NULL && chain_head->next != NULL)
1258 is_user_defined = TRUE;
1261 if (is_builtin || is_user_defined)
1262 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1263 XTF_LOAD_MUST_SUCCEED);
1265 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1270 target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1272 xt_t->t = g_try_malloc0(target_size);
1273 if (xt_t->t == NULL)
1276 xt_t->t->u.target_size = target_size;
1278 if (is_builtin || is_user_defined) {
1279 struct xt_standard_target *target;
1281 target = (struct xt_standard_target *)(xt_t->t);
1282 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
1284 if (is_builtin == TRUE)
1285 target->verdict = target_to_verdict(target_name);
1286 else if (is_user_defined == TRUE) {
1287 struct connman_iptables_entry *target_rule;
1289 if (chain_head == NULL) {
1294 target_rule = chain_head->next->data;
1295 target->verdict = target_rule->offset;
1298 strcpy(xt_t->t->u.user.name, target_name);
1299 xt_t->t->u.user.revision = xt_t->revision;
1300 if (xt_t->init != NULL)
1301 xt_t->init(xt_t->t);
1304 if (xt_t->x6_options != NULL)
1305 iptables_globals.opts =
1306 xtables_options_xfrm(
1307 #if XTABLES_VERSION_CODE > 5
1308 iptables_globals.orig_opts,
1310 iptables_globals.opts,
1312 &xt_t->option_offset);
1314 iptables_globals.opts =
1315 xtables_merge_options(
1316 #if XTABLES_VERSION_CODE > 5
1317 iptables_globals.orig_opts,
1319 iptables_globals.opts,
1321 &xt_t->option_offset);
1323 if (iptables_globals.opts == NULL) {
1331 static struct xtables_match *prepare_matches(struct connman_iptables *table,
1332 struct xtables_rule_match **xt_rm, char *match_name)
1334 struct xtables_match *xt_m;
1337 if (match_name == NULL)
1340 xt_m = xtables_find_match(match_name, XTF_LOAD_MUST_SUCCEED, xt_rm);
1341 match_size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
1343 xt_m->m = g_try_malloc0(match_size);
1344 if (xt_m->m == NULL)
1347 xt_m->m->u.match_size = match_size;
1348 strcpy(xt_m->m->u.user.name, xt_m->name);
1349 xt_m->m->u.user.revision = xt_m->revision;
1351 if (xt_m->init != NULL)
1352 xt_m->init(xt_m->m);
1354 if (xt_m == xt_m->next)
1357 if (xt_m->x6_options != NULL)
1358 iptables_globals.opts =
1359 xtables_options_xfrm(
1360 #if XTABLES_VERSION_CODE > 5
1361 iptables_globals.orig_opts,
1363 iptables_globals.opts,
1365 &xt_m->option_offset);
1367 iptables_globals.opts =
1368 xtables_merge_options(
1369 #if XTABLES_VERSION_CODE > 5
1370 iptables_globals.orig_opts,
1372 iptables_globals.opts,
1374 &xt_m->option_offset);
1376 if (iptables_globals.opts == NULL) {
1385 static int iptables_command(int argc, char *argv[])
1387 struct connman_iptables *table;
1388 struct xtables_rule_match *xt_rm;
1389 struct xtables_match *xt_m;
1390 struct xtables_target *xt_t;
1392 char *table_name, *chain, *new_chain, *match_name, *target_name;
1393 char *flush_chain, *delete_chain;
1394 int c, ret, in_len, out_len;
1395 gboolean dump, invert, insert, delete;
1396 struct in_addr src, dst;
1405 table_name = chain = new_chain = match_name = target_name = NULL;
1406 flush_chain = delete_chain = NULL;
1407 memset(&ip, 0, sizeof(struct ipt_ip));
1416 while ((c = getopt_long(argc, argv, "-A:F:I:L::N:X:d:j:i:m:o:s:t:",
1417 iptables_globals.opts, NULL)) != -1) {
1420 /* It is either -A, -D or -I at once */
1428 /* It is either -A, -D or -I at once */
1437 flush_chain = optarg;
1441 /* It is either -A, -D or -I at once */
1458 delete_chain = optarg;
1462 if (!inet_pton(AF_INET, optarg, &dst))
1466 inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1469 ip.invflags |= IPT_INV_DSTIP;
1474 in_len = strlen(optarg);
1476 if (in_len + 1 > IFNAMSIZ)
1479 strcpy(ip.iniface, optarg);
1480 memset(ip.iniface_mask, 0xff, in_len + 1);
1483 ip.invflags |= IPT_INV_VIA_IN;
1488 target_name = optarg;
1489 xt_t = prepare_target(table, target_name);
1496 match_name = optarg;
1497 xt_m = prepare_matches(table, &xt_rm, match_name);
1504 out_len = strlen(optarg);
1506 if (out_len + 1 > IFNAMSIZ)
1509 strcpy(ip.outiface, optarg);
1510 memset(ip.outiface_mask, 0xff, out_len + 1);
1513 ip.invflags |= IPT_INV_VIA_OUT;
1518 if (!inet_pton(AF_INET, optarg, &src))
1522 inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1525 ip.invflags |= IPT_INV_SRCIP;
1530 table_name = optarg;
1534 if (optarg[0] == '!' && optarg[1] == '\0') {
1540 connman_error("Invalid option");
1546 if (xt_t != NULL && (xt_t->x6_parse != NULL ||
1547 xt_t->parse != NULL) &&
1548 (c >= (int) xt_t->option_offset &&
1549 c < (int) xt_t->option_offset +
1550 XT_OPTION_OFFSET_SCALE)) {
1551 xtables_option_tpcall(c, argv,
1552 invert, xt_t, NULL);
1562 xtables_option_tfcall(xt_t);
1564 if (table_name == NULL)
1565 table_name = "filter";
1567 table = iptables_init(table_name);
1568 if (table == NULL) {
1573 if (delete_chain != NULL) {
1574 printf("Delete chain %s\n", delete_chain);
1576 iptables_delete_chain(table, delete_chain);
1582 iptables_dump(table);
1589 DBG("Flush chain %s", flush_chain);
1591 iptables_flush_chain(table, flush_chain);
1596 if (chain && new_chain) {
1602 DBG("New chain %s", new_chain);
1604 ret = iptables_add_chain(table, new_chain);
1612 if (delete == TRUE) {
1613 DBG("Deleting %s to %s (match %s)\n",
1614 target_name, chain, match_name);
1616 ret = iptables_delete_rule(table, &ip, chain,
1617 target_name, xt_t, match_name, xt_m);
1622 if (insert == TRUE) {
1623 DBG("Inserting %s to %s (match %s)",
1624 target_name, chain, match_name);
1626 ret = iptables_insert_rule(table, &ip, chain,
1627 target_name, xt_t, match_name, xt_m);
1631 DBG("Adding %s to %s (match %s)",
1632 target_name, chain, match_name);
1634 ret = iptables_append_rule(table, &ip, chain,
1635 target_name, xt_t, match_name, xt_m);
1651 int __connman_iptables_command(const char *format, ...)
1653 char **argv, **arguments, *command;
1660 va_start(args, format);
1662 command = g_strdup_vprintf(format, args);
1666 if (command == NULL)
1669 arguments = g_strsplit_set(command, " ", -1);
1671 for (argc = 0; arguments[argc]; argc++);
1674 DBG("command %s argc %d", command, argc);
1676 argv = g_try_malloc0(argc * sizeof(char *));
1679 g_strfreev(arguments);
1683 argv[0] = "iptables";
1684 for (i = 1; i < argc; i++)
1685 argv[i] = arguments[i - 1];
1687 ret = iptables_command(argc, argv);
1690 g_strfreev(arguments);
1697 int __connman_iptables_commit(const char *table_name)
1699 struct connman_iptables *table;
1700 struct ipt_replace *repl;
1703 DBG("%s", table_name);
1705 table = g_hash_table_lookup(table_hash, table_name);
1709 repl = iptables_blob(table);
1711 err = iptables_replace(table, repl);
1713 g_free(repl->counters);
1719 g_hash_table_remove(table_hash, table_name);
1724 static void remove_table(gpointer user_data)
1726 struct connman_iptables *table = user_data;
1728 table_cleanup(table);
1731 int __connman_iptables_init(void)
1735 table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1736 g_free, remove_table);
1738 xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1744 void __connman_iptables_cleanup(void)
1748 g_hash_table_destroy(table_hash);
1750 xtables_free_opts(1);