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);
230 static void update_offsets(struct connman_iptables *table)
233 struct connman_iptables_entry *entry, *prev_entry;
235 for (list = table->entries; list; list = list->next) {
238 if (list == table->entries) {
245 prev_entry = prev->data;
247 entry->offset = prev_entry->offset +
248 prev_entry->entry->next_offset;
252 static int iptables_add_entry(struct connman_iptables *table,
253 struct ipt_entry *entry, GList *before)
255 struct connman_iptables_entry *e;
260 e = g_try_malloc0(sizeof(struct connman_iptables_entry));
266 table->entries = g_list_insert_before(table->entries, before, e);
267 table->num_entries++;
268 table->size += entry->next_offset;
270 update_offsets(table);
275 static int iptables_add_chain(struct connman_iptables *table,
279 struct ipt_entry *entry_head;
280 struct ipt_entry *entry_return;
281 struct ipt_error_target *error;
282 struct ipt_standard_target *standard;
283 u_int16_t entry_head_size, entry_return_size;
285 last = g_list_last(table->entries);
288 * An empty chain is composed of:
289 * - A head entry, with no match and an error target.
290 * The error target data is the chain name.
291 * - A tail entry, with no match and a standard target.
292 * The standard target verdict is XT_RETURN (return to the
297 entry_head_size = sizeof(struct ipt_entry) +
298 sizeof(struct ipt_error_target);
299 entry_head = g_try_malloc0(entry_head_size);
300 if (entry_head == NULL)
303 memset(entry_head, 0, entry_head_size);
305 entry_head->target_offset = sizeof(struct ipt_entry);
306 entry_head->next_offset = entry_head_size;
308 error = (struct ipt_error_target *) entry_head->elems;
309 strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
310 error->t.u.user.target_size = ALIGN(sizeof(struct ipt_error_target));
311 strcpy(error->error, name);
313 if (iptables_add_entry(table, entry_head, last) < 0)
317 entry_return_size = sizeof(struct ipt_entry) +
318 sizeof(struct ipt_standard_target);
319 entry_return = g_try_malloc0(entry_return_size);
320 if (entry_return == NULL)
323 memset(entry_return, 0, entry_return_size);
325 entry_return->target_offset = sizeof(struct ipt_entry);
326 entry_return->next_offset = entry_return_size;
328 standard = (struct ipt_standard_target *) entry_return->elems;
329 standard->target.u.user.target_size =
330 ALIGN(sizeof(struct ipt_standard_target));
331 standard->verdict = XT_RETURN;
333 if (iptables_add_entry(table, entry_return, last) < 0)
340 g_free(entry_return);
345 static struct ipt_entry *
346 new_rule(char *target_name, struct xtables_target *xt_t,
347 char *match_name, struct xtables_match *xt_m)
349 struct ipt_entry *new_entry;
350 size_t match_size, target_size;
351 int is_builtin = is_builtin_target(target_name);
354 match_size = xt_m->m->u.match_size;
359 target_size = ALIGN(xt_t->t->u.target_size);
363 new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
365 if (new_entry == NULL)
368 new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
369 new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
372 struct xt_entry_match *entry_match;
374 entry_match = (struct xt_entry_match *)new_entry->elems;
375 memcpy(entry_match, xt_m->m, match_size);
379 struct xt_entry_target *entry_target;
382 struct xt_standard_target *target;
384 target = (struct xt_standard_target *)(xt_t->t);
385 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
386 target->verdict = target_to_verdict(target_name);
389 entry_target = ipt_get_target(new_entry);
390 memcpy(entry_target, xt_t->t, target_size);
397 iptables_add_rule(struct connman_iptables *table, char *chain_name,
398 char *target_name, struct xtables_target *xt_t,
399 char *match_name, struct xtables_match *xt_m)
402 struct ipt_entry *new_entry;
404 chain_tail = find_chain_tail(table, chain_name);
405 if (chain_tail == NULL)
408 new_entry = new_rule(target_name, xt_t,
410 if (new_entry == NULL)
413 return iptables_add_entry(table, new_entry, chain_tail->prev);
416 static struct ipt_replace *
417 iptables_blob(struct connman_iptables *table)
419 struct ipt_replace *r;
421 struct connman_iptables_entry *e;
422 unsigned char *entry_index;
424 r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
428 memset(r, 0, sizeof(*r) + table->size);
430 r->counters = g_try_malloc0(sizeof(struct xt_counters)
431 * table->num_entries);
432 if (r->counters == NULL) {
437 strcpy(r->name, table->info->name);
438 r->num_entries = table->num_entries;
439 r->size = table->size;
441 r->num_counters = table->old_entries;
442 r->valid_hooks = table->info->valid_hooks;
444 memcpy(r->hook_entry, table->info->hook_entry,
445 sizeof(table->info->hook_entry));
446 memcpy(r->underflow, table->info->underflow,
447 sizeof(table->info->underflow));
449 entry_index = (unsigned char *)r->entries;
450 for (list = table->entries; list; list = list->next) {
453 memcpy(entry_index, e->entry, e->entry->next_offset);
454 entry_index += e->entry->next_offset;
460 static void dump_target(struct connman_iptables *table,
461 struct ipt_entry *entry)
464 struct xtables_target *xt_t;
465 struct xt_entry_target *target;
467 target = ipt_get_target(entry);
469 if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
470 struct xt_standard_target *t;
472 t = (struct xt_standard_target *)target;
474 switch (t->verdict) {
476 connman_info("\ttarget RETURN");
480 connman_info("\ttarget ACCEPT");
484 connman_info("\ttarget DROP");
488 connman_info("\ttarget QUEUE");
492 connman_info("\ttarget STOP");
496 connman_info("\tJUMP @%p (0x%x)",
497 (char*)table->blob_entries->entrytable +
498 t->verdict, t->verdict);
502 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
503 XTF_LOAD_MUST_SUCCEED);
505 if(xt_t->print != NULL)
506 xt_t->print(NULL, target, 1);
508 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
510 connman_info("\ttarget %s", target->u.user.name);
514 if(xt_t->print != NULL) {
515 connman_info("\ttarget ");
516 xt_t->print(NULL, target, 1);
521 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
523 struct xtables_match *xt_m;
524 struct xt_entry_match *match;
526 if (entry->elems == (unsigned char *)entry + entry->target_offset)
529 match = (struct xt_entry_match *) entry->elems;
531 if (!strlen(match->u.user.name))
534 xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
538 if(xt_m->print != NULL) {
539 connman_info("\tmatch ");
540 xt_m->print(NULL, match, 1);
546 connman_info("\tmatch %s", match->u.user.name);
550 static int dump_entry(struct ipt_entry *entry,
551 struct connman_iptables *table)
553 struct xt_entry_target *target;
557 offset = (char *)entry - (char *)table->blob_entries->entrytable;
558 target = ipt_get_target(entry);
559 builtin = is_hook_entry(table, entry);
561 if (entry_to_offset(table, entry) + entry->next_offset ==
562 table->blob_entries->size) {
563 connman_info("End of CHAIN 0x%x", offset);
567 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
568 connman_info("USER CHAIN (%s) %p match %p target %p size %d",
569 target->data, entry, entry->elems,
570 (char *)entry + entry->target_offset,
574 } else if (builtin >= 0) {
575 connman_info("CHAIN (%s) %p match %p target %p size %d",
576 hooknames[builtin], entry, entry->elems,
577 (char *)entry + entry->target_offset,
580 connman_info("RULE %p match %p target %p size %d", entry,
582 (char *)entry + entry->target_offset,
586 dump_match(table, entry);
587 dump_target(table, entry);
592 static void iptables_dump(struct connman_iptables *table)
594 connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
596 table->info->valid_hooks, table->info->num_entries,
599 ENTRY_ITERATE(table->blob_entries->entrytable,
600 table->blob_entries->size,
605 static int iptables_get_entries(struct connman_iptables *table)
607 socklen_t entry_size;
609 entry_size = sizeof(struct ipt_get_entries) + table->info->size;
611 return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
612 table->blob_entries, &entry_size);
615 static int iptables_replace(struct connman_iptables *table,
616 struct ipt_replace *r)
618 return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
619 sizeof(*r) + r->size);
622 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
624 struct ipt_entry *new_entry;
626 new_entry = g_try_malloc0(entry->next_offset);
627 if (new_entry == NULL)
630 memcpy(new_entry, entry, entry->next_offset);
632 return iptables_add_entry(table, new_entry, NULL);
635 static void table_cleanup(struct connman_iptables *table)
638 struct connman_iptables_entry *entry;
640 close(table->ipt_sock);
642 for (list = table->entries; list; list = list->next) {
645 g_free(entry->entry);
648 g_list_free(table->entries);
650 g_free(table->blob_entries);
654 static struct connman_iptables *iptables_init(char *table_name)
656 struct connman_iptables *table;
659 table = g_hash_table_lookup(table_hash, table_name);
663 table = g_try_new0(struct connman_iptables, 1);
667 table->info = g_try_new0(struct ipt_getinfo, 1);
668 if (table->info == NULL)
671 table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
672 if (table->ipt_sock < 0)
675 s = sizeof(*table->info);
676 strcpy(table->info->name, table_name);
677 if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
678 table->info, &s) < 0)
681 table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
683 if (table->blob_entries == NULL)
686 strcpy(table->blob_entries->name, table_name);
687 table->blob_entries->size = table->info->size;
689 if (iptables_get_entries(table) < 0)
692 table->num_entries = 0;
693 table->old_entries = table->info->num_entries;
696 ENTRY_ITERATE(table->blob_entries->entrytable,
697 table->blob_entries->size,
700 g_hash_table_insert(table_hash, table_name, table);
706 table_cleanup(table);
711 static struct option iptables_opts[] = {
712 {.name = "append", .has_arg = 1, .val = 'A'},
713 {.name = "list", .has_arg = 2, .val = 'L'},
714 {.name = "new-chain", .has_arg = 1, .val = 'N'},
715 {.name = "in-interface", .has_arg = 1, .val = 'i'},
716 {.name = "jump", .has_arg = 1, .val = 'j'},
717 {.name = "match", .has_arg = 1, .val = 'm'},
718 {.name = "out-interface", .has_arg = 1, .val = 'o'},
719 {.name = "table", .has_arg = 1, .val = 't'},
723 struct xtables_globals iptables_globals = {
725 .opts = iptables_opts,
726 .orig_opts = iptables_opts,
729 static int iptables_command(int argc, char *argv[])
731 struct connman_iptables *table;
732 struct xtables_match *xt_m;
733 struct xtables_target *xt_t;
734 char *table_name, *chain, *new_chain, *match_name, *target_name;
737 gboolean dump, invert;
744 table_name = chain = new_chain = match_name = target_name = NULL;
752 while ((c = getopt_long(argc, argv,
753 "-A:L::N:j:i:m:o:t:", iptables_globals.opts, NULL)) != -1) {
768 target_name = optarg;
769 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
774 size = ALIGN(sizeof(struct ipt_entry_target)) +
777 xt_t->t = g_try_malloc0(size);
780 xt_t->t->u.target_size = size;
781 strcpy(xt_t->t->u.user.name, target_name);
782 xt_t->t->u.user.revision = xt_t->revision;
783 if (xt_t->init != NULL)
785 iptables_globals.opts =
786 xtables_merge_options(iptables_globals.opts,
788 &xt_t->option_offset);
789 if (iptables_globals.opts == NULL)
800 xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
801 size = ALIGN(sizeof(struct ipt_entry_match)) +
803 xt_m->m = g_try_malloc0(size);
806 xt_m->m->u.match_size = size;
807 strcpy(xt_m->m->u.user.name, xt_m->name);
808 xt_m->m->u.user.revision = xt_m->revision;
809 if (xt_m->init != NULL)
811 if (xt_m != xt_m->next) {
812 iptables_globals.opts =
813 xtables_merge_options(iptables_globals.opts,
815 &xt_m->option_offset);
816 if (iptables_globals.opts == NULL)
830 if (optarg[0] == '!' && optarg[1] == '\0') {
836 connman_error("Invalid option");
842 if (xt_t == NULL || xt_t->parse == NULL ||
843 !xt_t->parse(c - xt_t->option_offset, argv, invert,
844 &xt_t->tflags, NULL, &xt_t->t)) {
845 if (xt_m == NULL || xt_m->parse == NULL)
848 xt_m->parse(c - xt_m->option_offset, argv,
849 invert, &xt_m->mflags, NULL, &xt_m->m);
856 if (table_name == NULL)
857 table_name = "filter";
859 table = iptables_init(table_name);
866 iptables_dump(table);
872 if (chain && new_chain) {
878 DBG("New chain %s", new_chain);
880 ret = iptables_add_chain(table, new_chain);
885 if (target_name == NULL)
888 DBG("Adding %s to %s (match %s)",
889 target_name, chain, match_name);
891 ret = iptables_add_rule(table, chain, target_name, xt_t,
907 int __connman_iptables_command(const char *format, ...)
909 char **argv, **arguments, *command;
916 va_start(args, format);
918 command = g_strdup_vprintf(format, args);
925 arguments = g_strsplit_set(command, " ", -1);
927 for (argc = 0; arguments[argc]; argc++);
929 DBG("command %s argc %d", command, ++argc);
931 argv = g_try_malloc0(argc * sizeof(char *));
934 g_strfreev(arguments);
938 argv[0] = "iptables";
939 for (i = 1; i < argc; i++)
940 argv[i] = arguments[i - 1];
942 ret = iptables_command(argc, argv);
945 g_strfreev(arguments);
952 int __connman_iptables_commit(const char *table_name)
954 struct connman_iptables *table;
955 struct ipt_replace *repl;
957 table = g_hash_table_lookup(table_hash, table_name);
961 repl = iptables_blob(table);
963 return iptables_replace(table, repl);
966 static void remove_table(gpointer user_data)
968 struct connman_iptables *table = user_data;
970 table_cleanup(table);
973 int __connman_iptables_init(void)
977 table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
980 xtables_init_all(&iptables_globals, NFPROTO_IPV4);
986 void __connman_iptables_cleanup(void)
988 g_hash_table_destroy(table_hash);
990 xtables_free_opts(1);