7c62ec3d74f87417c6d107729f48eb37e60b229a
[framework/connectivity/connman.git] / src / iptables.c
1 /*
2  *
3  *  Connection Manager
4  *
5  *  Copyright (C) 2007-2011  Intel Corporation. All rights reserved.
6  *
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.
10  *
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.
15  *
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
19  *
20  */
21
22 #ifdef HAVE_CONFIG_H
23 #include <config.h>
24 #endif
25
26 #include <getopt.h>
27 #include <stdlib.h>
28 #include <stdio.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <sys/errno.h>
32 #include <sys/socket.h>
33 #include <xtables.h>
34
35 #include <linux/netfilter_ipv4/ip_tables.h>
36
37 #include "connman.h"
38
39
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",
46 };
47
48 #define LABEL_ACCEPT  "ACCEPT"
49 #define LABEL_DROP    "DROP"
50 #define LABEL_QUEUE   "QUEUE"
51 #define LABEL_RETURN  "RETURN"
52
53 #define XT_OPTION_OFFSET_SCALE 256
54
55 /* fn returns 0 to continue iteration */
56 #define _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
57 ({                                                              \
58         unsigned int __i;                                       \
59         int __n;                                                \
60         int __ret = 0;                                          \
61         type *__entry;                                          \
62                                                                 \
63         for (__i = 0, __n = 0; __i < (size);                    \
64              __i += __entry->next_offset, __n++) {              \
65                 __entry = (void *)(entries) + __i;              \
66                 if (__n < n)                                    \
67                         continue;                               \
68                                                                 \
69                 __ret = fn(__entry,  ## args);                  \
70                 if (__ret != 0)                                 \
71                         break;                                  \
72         }                                                       \
73         __ret;                                                  \
74 })
75
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)
79
80 #define ENTRY_ITERATE(entries, size, fn, args...) \
81         _XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
82
83 #define MIN_ALIGN (__alignof__(struct ipt_entry))
84
85 #define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
86
87 struct error_target {
88         struct xt_entry_target t;
89         char error[IPT_TABLE_MAXNAMELEN];
90 };
91
92 struct connman_iptables_entry {
93         int offset;
94         int builtin;
95
96         struct ipt_entry *entry;
97 };
98
99 struct connman_iptables {
100         int ipt_sock;
101
102         struct ipt_getinfo *info;
103         struct ipt_get_entries *blob_entries;
104
105         unsigned int num_entries;
106         unsigned int old_entries;
107         unsigned int size;
108
109         unsigned int underflow[NF_INET_NUMHOOKS];
110         unsigned int hook_entry[NF_INET_NUMHOOKS];
111
112         GList *entries;
113 };
114
115 static GHashTable *table_hash = NULL;
116
117 static struct ipt_entry *get_entry(struct connman_iptables *table,
118                                         unsigned int offset)
119 {
120         return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
121                                                                         offset);
122 }
123
124 static int is_hook_entry(struct connman_iptables *table,
125                                 struct ipt_entry *entry)
126 {
127         unsigned int i;
128
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)
132                         return i;
133         }
134
135         return -1;
136 }
137
138 static unsigned long entry_to_offset(struct connman_iptables *table,
139                                         struct ipt_entry *entry)
140 {
141         return (void *)entry - (void *)table->blob_entries->entrytable;
142 }
143
144 static int target_to_verdict(char *target_name)
145 {
146         if (!strcmp(target_name, LABEL_ACCEPT))
147                 return -NF_ACCEPT - 1;
148
149         if (!strcmp(target_name, LABEL_DROP))
150                 return -NF_DROP - 1;
151
152         if (!strcmp(target_name, LABEL_QUEUE))
153                 return -NF_QUEUE - 1;
154
155         if (!strcmp(target_name, LABEL_RETURN))
156                 return XT_RETURN;
157
158         return 0;
159 }
160
161 static gboolean is_builtin_target(char *target_name)
162 {
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))
167                 return TRUE;
168
169         return FALSE;
170 }
171
172 static gboolean is_jump(struct connman_iptables_entry *e)
173 {
174         struct xt_entry_target *target;
175
176         target = ipt_get_target(e->entry);
177
178         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
179                 struct xt_standard_target *t;
180
181                 t = (struct xt_standard_target *)target;
182
183                 switch (t->verdict) {
184                 case XT_RETURN:
185                 case -NF_ACCEPT - 1:
186                 case -NF_DROP - 1:
187                 case -NF_QUEUE - 1:
188                 case -NF_STOP - 1:
189                         return false;
190
191                 default:
192                         return true;
193                 }
194         }
195
196         return false;
197 }
198
199 static gboolean is_chain(struct connman_iptables *table,
200                                 struct connman_iptables_entry *e)
201 {
202         struct ipt_entry *entry;
203         struct xt_entry_target *target;
204
205         entry = e->entry;
206         if (e->builtin >= 0)
207                 return TRUE;
208
209         target = ipt_get_target(entry);
210         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
211                 return TRUE;
212
213         return FALSE;
214 }
215
216 static GList *find_chain_head(struct connman_iptables *table,
217                                 char *chain_name)
218 {
219         GList *list;
220         struct connman_iptables_entry *head;
221         struct ipt_entry *entry;
222         struct xt_entry_target *target;
223         int builtin;
224
225         for (list = table->entries; list; list = list->next) {
226                 head = list->data;
227                 entry = head->entry;
228
229                 /* Buit-in chain */
230                 builtin = head->builtin;
231                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
232                         break;
233
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))
238                         break;
239         }
240
241         return list;
242 }
243
244 static GList *find_chain_tail(struct connman_iptables *table,
245                                 char *chain_name)
246 {
247         struct connman_iptables_entry *tail;
248         GList *chain_head, *list;
249
250         chain_head = find_chain_head(table, chain_name);
251         if (chain_head == NULL)
252                 return NULL;
253
254         /* Then we look for the next chain */
255         for (list = chain_head->next; list; list = list->next) {
256                 tail = list->data;
257
258                 if (is_chain(table, tail))
259                         return list;
260         }
261
262         /* Nothing found, we return the table end */
263         return g_list_last(table->entries);
264 }
265
266
267 static void update_offsets(struct connman_iptables *table)
268 {
269         GList *list, *prev;
270         struct connman_iptables_entry *entry, *prev_entry;
271
272         for (list = table->entries; list; list = list->next) {
273                 entry = list->data;
274
275                 if (list == table->entries) {
276                         entry->offset = 0;
277
278                         continue;
279                 }
280
281                 prev = list->prev;
282                 prev_entry = prev->data;
283
284                 entry->offset = prev_entry->offset +
285                                         prev_entry->entry->next_offset;
286         }
287 }
288
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)
293 {
294         struct connman_iptables_entry *tmp;
295         struct xt_standard_target *t;
296         GList *list;
297         int offset;
298
299         offset = modified_entry->entry->next_offset;
300
301         for (list = table->entries; list; list = list->next) {
302                 tmp = list->data;
303
304                 if (!is_jump(tmp))
305                         continue;
306
307                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
308
309                 if (is_removing == TRUE) {
310                         if (t->verdict >= entry_before->offset)
311                                 t->verdict -= offset;
312                 } else {
313                         if (t->verdict > entry_before->offset)
314                                 t->verdict += offset;
315                 }
316         }
317 }
318
319 static int iptables_add_entry(struct connman_iptables *table,
320                                 struct ipt_entry *entry, GList *before,
321                                         int builtin)
322 {
323         struct connman_iptables_entry *e, *entry_before;
324
325         if (table == NULL)
326                 return -1;
327
328         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
329         if (e == NULL)
330                 return -1;
331
332         e->entry = entry;
333         e->builtin = builtin;
334
335         table->entries = g_list_insert_before(table->entries, before, e);
336         table->num_entries++;
337         table->size += entry->next_offset;
338
339         if (before == NULL) {
340                 e->offset = table->size - entry->next_offset;
341
342                 return 0;
343         }
344
345         entry_before = before->data;
346
347         /*
348          * We've just appended/insterted a new entry. All references
349          * should be bumped accordingly.
350          */
351         update_targets_reference(table, entry_before, e, FALSE);
352
353         update_offsets(table);
354
355         return 0;
356 }
357
358 static int remove_table_entry(struct connman_iptables *table,
359                                 struct connman_iptables_entry *entry)
360 {
361         int removed = 0;
362
363         table->num_entries--;
364         table->size -= entry->entry->next_offset;
365         removed = entry->entry->next_offset;
366
367         g_free(entry->entry);
368
369         table->entries = g_list_remove(table->entries, entry);
370
371         return removed;
372 }
373
374 static int iptables_flush_chain(struct connman_iptables *table,
375                                                 char *name)
376 {
377         GList *chain_head, *chain_tail, *list, *next;
378         struct connman_iptables_entry *entry;
379         int builtin, removed = 0;
380
381         chain_head = find_chain_head(table, name);
382         if (chain_head == NULL)
383                 return -EINVAL;
384
385         chain_tail = find_chain_tail(table, name);
386         if (chain_tail == NULL)
387                 return -EINVAL;
388
389         entry = chain_head->data;
390         builtin = entry->builtin;
391
392         if (builtin >= 0)
393                 list = chain_head;
394         else
395                 list = chain_head->next;
396
397         if (list == chain_tail->prev)
398                 return 0;
399
400         while (list != chain_tail->prev) {
401                 entry = list->data;
402                 next = g_list_next(list);
403
404                 removed += remove_table_entry(table, entry);
405
406                 list = next;
407         }
408
409         if (builtin >= 0) {
410                 struct connman_iptables_entry *e;
411
412                 entry = list->data;
413
414                 entry->builtin = builtin;
415
416                 table->underflow[builtin] -= removed;
417
418                 for (list = chain_tail; list; list = list->next) {
419                         e = list->data;
420
421                         builtin = e->builtin;
422                         if (builtin < 0)
423                                 continue;
424
425                         table->hook_entry[builtin] -= removed;
426                         table->underflow[builtin] -= removed;
427                 }
428         }
429
430         update_offsets(table);
431
432         return 0;
433 }
434
435 static int iptables_add_chain(struct connman_iptables *table,
436                                         char *name)
437 {
438         GList *last;
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;
444
445         last = g_list_last(table->entries);
446
447         /*
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
453          *   caller).
454          */
455
456         /* head entry */
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)
461                 goto err_head;
462
463         memset(entry_head, 0, entry_head_size);
464
465         entry_head->target_offset = sizeof(struct ipt_entry);
466         entry_head->next_offset = entry_head_size;
467
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);
472
473         if (iptables_add_entry(table, entry_head, last, -1) < 0)
474                 goto err_head;
475
476         /* tail entry */
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)
481                 goto err;
482
483         memset(entry_return, 0, entry_return_size);
484
485         entry_return->target_offset = sizeof(struct ipt_entry);
486         entry_return->next_offset = entry_return_size;
487
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;
492
493         if (iptables_add_entry(table, entry_return, last, -1) < 0)
494                 goto err;
495
496         return 0;
497
498 err:
499         g_free(entry_return);
500 err_head:
501         g_free(entry_head);
502
503         return -ENOMEM;
504 }
505
506 static int iptables_delete_chain(struct connman_iptables *table, char *name)
507 {
508         struct connman_iptables_entry *entry;
509         GList *chain_head, *chain_tail;
510
511         chain_head = find_chain_head(table, name);
512         if (chain_head == NULL)
513                 return -EINVAL;
514
515         entry = chain_head->data;
516
517         /* We cannot remove builtin chain */
518         if (entry->builtin >= 0)
519                 return -EINVAL;
520
521         chain_tail = find_chain_tail(table, name);
522         if (chain_tail == NULL)
523                 return -EINVAL;
524
525         /* Chain must be flushed */
526         if (chain_head->next != chain_tail->prev)
527                 return -EINVAL;
528
529         remove_table_entry(table, entry);
530
531         entry = chain_tail->prev->data;
532         remove_table_entry(table, entry);
533
534         update_offsets(table);
535
536         return 0;
537 }
538
539 static struct ipt_entry *new_rule(struct ipt_ip *ip,
540                 char *target_name, struct xtables_target *xt_t,
541                 struct xtables_rule_match *xt_rm)
542 {
543         struct xtables_rule_match *tmp_xt_rm;
544         struct ipt_entry *new_entry;
545         size_t match_size, target_size;
546
547         match_size = 0;
548         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL; tmp_xt_rm = tmp_xt_rm->next)
549                 match_size += tmp_xt_rm->match->m->u.match_size;
550
551         if (xt_t)
552                 target_size = ALIGN(xt_t->t->u.target_size);
553         else
554                 target_size = ALIGN(sizeof(struct xt_standard_target));
555
556         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
557                                                                 match_size);
558         if (new_entry == NULL)
559                 return NULL;
560
561         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
562
563         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
564         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
565                                                                 match_size;
566
567         match_size = 0;
568         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
569                                 tmp_xt_rm = tmp_xt_rm->next) {
570                 memcpy(new_entry->elems + match_size, tmp_xt_rm->match->m,
571                                         tmp_xt_rm->match->m->u.match_size);
572                 match_size += tmp_xt_rm->match->m->u.match_size;
573         }
574
575         if (xt_t) {
576                 struct xt_entry_target *entry_target;
577
578                 entry_target = ipt_get_target(new_entry);
579                 memcpy(entry_target, xt_t->t, target_size);
580         }
581
582         return new_entry;
583 }
584
585 static void update_hooks(struct connman_iptables *table, GList *chain_head,
586                                 struct ipt_entry *entry)
587 {
588         GList *list;
589         struct connman_iptables_entry *head, *e;
590         int builtin;
591
592         if (chain_head == NULL)
593                 return;
594
595         head = chain_head->data;
596
597         builtin = head->builtin;
598         if (builtin < 0)
599                 return;
600
601         table->underflow[builtin] += entry->next_offset;
602
603         for (list = chain_head->next; list; list = list->next) {
604                 e = list->data;
605
606                 builtin = e->builtin;
607                 if (builtin < 0)
608                         continue;
609
610                 table->hook_entry[builtin] += entry->next_offset;
611                 table->underflow[builtin] += entry->next_offset;
612         }
613 }
614
615 static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
616                                 struct ipt_ip *ip, char *chain_name,
617                                 char *target_name, struct xtables_target *xt_t,
618                                 int *builtin, struct xtables_rule_match *xt_rm)
619 {
620         GList *chain_tail, *chain_head;
621         struct ipt_entry *new_entry;
622         struct connman_iptables_entry *head;
623
624         chain_head = find_chain_head(table, chain_name);
625         if (chain_head == NULL)
626                 return NULL;
627
628         chain_tail = find_chain_tail(table, chain_name);
629         if (chain_tail == NULL)
630                 return NULL;
631
632         new_entry = new_rule(ip, target_name, xt_t, xt_rm);
633         if (new_entry == NULL)
634                 return NULL;
635
636         update_hooks(table, chain_head, new_entry);
637
638         /*
639          * If the chain is builtin, and does not have any rule,
640          * then the one that we're inserting is becoming the head
641          * and thus needs the builtin flag.
642          */
643         head = chain_head->data;
644         if (head->builtin < 0)
645                 *builtin = -1;
646         else if (chain_head == chain_tail->prev) {
647                 *builtin = head->builtin;
648                 head->builtin = -1;
649         }
650
651         return new_entry;
652 }
653
654 static int iptables_append_rule(struct connman_iptables *table,
655                                 struct ipt_ip *ip, char *chain_name,
656                                 char *target_name, struct xtables_target *xt_t,
657                                 struct xtables_rule_match *xt_rm)
658 {
659         GList *chain_tail;
660         struct ipt_entry *new_entry;
661         int builtin = -1, ret;
662
663         DBG("");
664
665         chain_tail = find_chain_tail(table, chain_name);
666         if (chain_tail == NULL)
667                 return -EINVAL;
668
669         new_entry = prepare_rule_inclusion(table, ip, chain_name,
670                                         target_name, xt_t, &builtin, xt_rm);
671         if (new_entry == NULL)
672                 return -EINVAL;
673
674         ret = iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
675         if (ret < 0)
676                 g_free(new_entry);
677
678         return ret;
679 }
680
681 static int iptables_insert_rule(struct connman_iptables *table,
682                                 struct ipt_ip *ip, char *chain_name,
683                                 char *target_name, struct xtables_target *xt_t,
684                                 struct xtables_rule_match *xt_rm)
685 {
686         struct ipt_entry *new_entry;
687         int builtin = -1, ret;
688         GList *chain_head;
689
690         chain_head = find_chain_head(table, chain_name);
691         if (chain_head == NULL)
692                 return -EINVAL;
693
694         new_entry = prepare_rule_inclusion(table, ip, chain_name,
695                                         target_name, xt_t, &builtin, xt_rm);
696         if (new_entry == NULL)
697                 return -EINVAL;
698
699         if (builtin == -1)
700                 chain_head = chain_head->next;
701
702         ret = iptables_add_entry(table, new_entry, chain_head, builtin);
703         if (ret < 0)
704                 g_free(new_entry);
705
706         return ret;
707 }
708
709 static gboolean is_same_ipt_entry(struct ipt_entry *i_e1,
710                                         struct ipt_entry *i_e2)
711 {
712         if (memcmp(&i_e1->ip, &i_e2->ip, sizeof(struct ipt_ip)) != 0)
713                 return FALSE;
714
715         if (i_e1->target_offset != i_e2->target_offset)
716                 return FALSE;
717
718         if (i_e1->next_offset != i_e2->next_offset)
719                 return FALSE;
720
721         return TRUE;
722 }
723
724 static gboolean is_same_target(struct xt_entry_target *xt_e_t1,
725                                         struct xt_entry_target *xt_e_t2)
726 {
727         if (xt_e_t1 == NULL || xt_e_t2 == NULL)
728                 return FALSE;
729
730         if (strcmp(xt_e_t1->u.user.name, IPT_STANDARD_TARGET) == 0) {
731                 struct xt_standard_target *xt_s_t1;
732                 struct xt_standard_target *xt_s_t2;
733
734                 xt_s_t1 = (struct xt_standard_target *) xt_e_t1;
735                 xt_s_t2 = (struct xt_standard_target *) xt_e_t2;
736
737                 if (xt_s_t1->verdict != xt_s_t2->verdict)
738                         return FALSE;
739         } else {
740                 if (xt_e_t1->u.target_size != xt_e_t2->u.target_size)
741                         return FALSE;
742
743                 if (strcmp(xt_e_t1->u.user.name, xt_e_t2->u.user.name) != 0)
744                         return FALSE;
745         }
746
747         return TRUE;
748 }
749
750 static gboolean is_same_match(struct xt_entry_match *xt_e_m1,
751                                 struct xt_entry_match *xt_e_m2)
752 {
753         if (xt_e_m1 == NULL || xt_e_m2 == NULL)
754                 return FALSE;
755
756         if (xt_e_m1->u.match_size != xt_e_m2->u.match_size)
757                 return FALSE;
758
759         if (xt_e_m1->u.user.revision != xt_e_m2->u.user.revision)
760                 return FALSE;
761
762         if (strcmp(xt_e_m1->u.user.name, xt_e_m2->u.user.name) != 0)
763                 return FALSE;
764
765         return TRUE;
766 }
767
768 static GList *find_existing_rule(struct connman_iptables *table,
769                                 struct ipt_ip *ip, char *chain_name,
770                                 char *target_name, struct xtables_target *xt_t,
771                                 struct xtables_match *xt_m,
772                                 struct xtables_rule_match *xt_rm)
773 {
774         GList *chain_tail, *chain_head, *list;
775         struct xt_entry_target *xt_e_t = NULL;
776         struct xt_entry_match *xt_e_m = NULL;
777         struct connman_iptables_entry *entry;
778         struct ipt_entry *entry_test;
779         int builtin;
780
781         chain_head = find_chain_head(table, chain_name);
782         if (chain_head == NULL)
783                 return NULL;
784
785         chain_tail = find_chain_tail(table, chain_name);
786         if (chain_tail == NULL)
787                 return NULL;
788
789         if (!xt_t && !xt_m)
790                 return NULL;
791
792         entry_test = new_rule(ip, target_name, xt_t, xt_rm);
793         if (entry_test == NULL)
794                 return NULL;
795
796         if (xt_t != NULL)
797                 xt_e_t = ipt_get_target(entry_test);
798         if (xt_m != NULL)
799                 xt_e_m = (struct xt_entry_match *)entry_test->elems;
800
801         entry = chain_head->data;
802         builtin = entry->builtin;
803
804         if (builtin >= 0)
805                 list = chain_head;
806         else
807                 list = chain_head->next;
808
809         for (; list != chain_tail->prev; list = list->next) {
810                 struct connman_iptables_entry *tmp;
811                 struct ipt_entry *tmp_e;
812
813                 tmp = list->data;
814                 tmp_e = tmp->entry;
815
816                 if (is_same_ipt_entry(entry_test, tmp_e) == FALSE)
817                         continue;
818
819                 if (xt_t != NULL) {
820                         struct xt_entry_target *tmp_xt_e_t;
821
822                         tmp_xt_e_t = ipt_get_target(tmp_e);
823
824                         if (!is_same_target(tmp_xt_e_t, xt_e_t))
825                                 continue;
826                 }
827
828                 if (xt_m != NULL) {
829                         struct xt_entry_match *tmp_xt_e_m;
830
831                         tmp_xt_e_m = (struct xt_entry_match *)tmp_e->elems;
832
833                         if (!is_same_match(tmp_xt_e_m, xt_e_m))
834                                 continue;
835                 }
836
837                 break;
838         }
839
840         g_free(entry_test);
841
842         if (list != chain_tail->prev)
843                 return list;
844
845         return NULL;
846 }
847
848 static int iptables_delete_rule(struct connman_iptables *table,
849                                 struct ipt_ip *ip, char *chain_name,
850                                 char *target_name, struct xtables_target *xt_t,
851                                 struct xtables_match *xt_m,
852                                 struct xtables_rule_match *xt_rm)
853 {
854         struct connman_iptables_entry *entry;
855         GList *chain_tail, *list;
856         int builtin, removed;
857
858         removed = 0;
859
860         chain_tail = find_chain_tail(table, chain_name);
861         if (chain_tail == NULL)
862                 return -EINVAL;
863
864         list = find_existing_rule(table, ip, chain_name, target_name,
865                                                         xt_t, xt_m, xt_rm);
866         if (list == NULL)
867                 return -EINVAL;
868
869         entry = list->data;
870         if (entry == NULL)
871                 return -EINVAL;
872
873         builtin = entry->builtin;
874
875         /* We have deleted a rule,
876          * all references should be bumped accordingly */
877         if (list->next != NULL)
878                 update_targets_reference(table, list->next->data,
879                                                 list->data, TRUE);
880
881         removed += remove_table_entry(table, entry);
882
883         if (builtin >= 0) {
884                 list = list->next;
885                 if (list) {
886                         entry = list->data;
887                         entry->builtin = builtin;
888                 }
889
890                 table->underflow[builtin] -= removed;
891                 for (list = chain_tail; list; list = list->next) {
892                         entry = list->data;
893
894                         builtin = entry->builtin;
895                         if (builtin < 0)
896                                 continue;
897
898                         table->hook_entry[builtin] -= removed;
899                         table->underflow[builtin] -= removed;
900                 }
901         }
902
903         update_offsets(table);
904
905         return 0;
906 }
907
908 static int iptables_compare_rule(struct connman_iptables *table,
909                                 struct ipt_ip *ip, char *chain_name,
910                                 char *target_name, struct xtables_target *xt_t,
911                                 struct xtables_match *xt_m,
912                                 struct xtables_rule_match *xt_rm)
913 {
914         struct connman_iptables_entry *entry;
915         GList *found;
916
917         found = find_existing_rule(table, ip, chain_name, target_name,
918                                                         xt_t, xt_m, xt_rm);
919         if (found == NULL)
920                 return -EINVAL;
921
922         entry = found->data;
923         if (entry == NULL)
924                 return -EINVAL;
925
926         return 0;
927 }
928
929
930 static int iptables_change_policy(struct connman_iptables *table,
931                                         char *chain_name, char *policy)
932 {
933         GList *chain_head;
934         struct connman_iptables_entry *entry;
935         struct xt_entry_target *target;
936         struct xt_standard_target *t;
937         int verdict;
938
939         verdict = target_to_verdict(policy);
940         if (verdict == 0)
941                 return -EINVAL;
942
943         chain_head = find_chain_head(table, chain_name);
944         if (chain_head == NULL)
945                 return -EINVAL;
946
947         entry = chain_head->data;
948         if (entry->builtin < 0)
949                 return -EINVAL;
950
951         target = ipt_get_target(entry->entry);
952
953         t = (struct xt_standard_target *)target;
954         t->verdict = verdict;
955
956         return 0;
957 }
958
959 static struct ipt_replace *iptables_blob(struct connman_iptables *table)
960 {
961         struct ipt_replace *r;
962         GList *list;
963         struct connman_iptables_entry *e;
964         unsigned char *entry_index;
965
966         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
967         if (r == NULL)
968                 return NULL;
969
970         memset(r, 0, sizeof(*r) + table->size);
971
972         r->counters = g_try_malloc0(sizeof(struct xt_counters)
973                                 * table->old_entries);
974         if (r->counters == NULL) {
975                 g_free(r);
976                 return NULL;
977         }
978
979         strcpy(r->name, table->info->name);
980         r->num_entries = table->num_entries;
981         r->size = table->size;
982
983         r->num_counters = table->old_entries;
984         r->valid_hooks  = table->info->valid_hooks;
985
986         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
987         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
988
989         entry_index = (unsigned char *)r->entries;
990         for (list = table->entries; list; list = list->next) {
991                 e = list->data;
992
993                 memcpy(entry_index, e->entry, e->entry->next_offset);
994                 entry_index += e->entry->next_offset;
995         }
996
997         return r;
998 }
999
1000 static void dump_ip(struct ipt_entry *entry)
1001 {
1002         struct ipt_ip *ip = &entry->ip;
1003         char ip_string[INET6_ADDRSTRLEN];
1004         char ip_mask[INET6_ADDRSTRLEN];
1005
1006         if (strlen(ip->iniface))
1007                 connman_info("\tin %s", ip->iniface);
1008
1009         if (strlen(ip->outiface))
1010                 connman_info("\tout %s", ip->outiface);
1011
1012         if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
1013                         inet_ntop(AF_INET, &ip->smsk,
1014                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
1015                 connman_info("\tsrc %s/%s", ip_string, ip_mask);
1016
1017         if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
1018                         inet_ntop(AF_INET, &ip->dmsk,
1019                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
1020                 connman_info("\tdst %s/%s", ip_string, ip_mask);
1021 }
1022
1023 static void dump_target(struct connman_iptables *table,
1024                                 struct ipt_entry *entry)
1025
1026 {
1027         struct xtables_target *xt_t;
1028         struct xt_entry_target *target;
1029
1030         target = ipt_get_target(entry);
1031
1032         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
1033                 struct xt_standard_target *t;
1034
1035                 t = (struct xt_standard_target *)target;
1036
1037                 switch (t->verdict) {
1038                 case XT_RETURN:
1039                         connman_info("\ttarget RETURN");
1040                         break;
1041
1042                 case -NF_ACCEPT - 1:
1043                         connman_info("\ttarget ACCEPT");
1044                         break;
1045
1046                 case -NF_DROP - 1:
1047                         connman_info("\ttarget DROP");
1048                         break;
1049
1050                 case -NF_QUEUE - 1:
1051                         connman_info("\ttarget QUEUE");
1052                         break;
1053
1054                 case -NF_STOP - 1:
1055                         connman_info("\ttarget STOP");
1056                         break;
1057
1058                 default:
1059                         connman_info("\tJUMP @%p (0x%x)",
1060                                 (char*)table->blob_entries->entrytable +
1061                                 t->verdict, t->verdict);
1062                         break;
1063                 }
1064
1065                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1066                                                 XTF_LOAD_MUST_SUCCEED);
1067
1068                 if(xt_t->print != NULL)
1069                         xt_t->print(NULL, target, 1);
1070         } else {
1071                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
1072                 if (xt_t == NULL) {
1073                         connman_info("\ttarget %s", target->u.user.name);
1074                         return;
1075                 }
1076
1077                 if(xt_t->print != NULL) {
1078                         connman_info("\ttarget ");
1079                         xt_t->print(NULL, target, 1);
1080                 }
1081         }
1082 }
1083
1084 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
1085 {
1086         struct xtables_match *xt_m;
1087         struct xt_entry_match *match;
1088
1089         if (entry->elems == (unsigned char *)entry + entry->target_offset)
1090                 return;
1091
1092         match = (struct xt_entry_match *) entry->elems;
1093
1094         if (!strlen(match->u.user.name))
1095                 return;
1096
1097         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
1098         if (xt_m == NULL)
1099                 goto out;
1100
1101         if(xt_m->print != NULL) {
1102                 connman_info("\tmatch ");
1103                 xt_m->print(NULL, match, 1);
1104
1105                 return;
1106         }
1107
1108 out:
1109         connman_info("\tmatch %s", match->u.user.name);
1110
1111 }
1112
1113 static int dump_entry(struct ipt_entry *entry,
1114                                 struct connman_iptables *table)
1115 {
1116         struct xt_entry_target *target;
1117         unsigned int offset;
1118         int builtin;
1119
1120         offset = (char *)entry - (char *)table->blob_entries->entrytable;
1121         target = ipt_get_target(entry);
1122         builtin = is_hook_entry(table, entry);
1123
1124         if (entry_to_offset(table, entry) + entry->next_offset ==
1125                                         table->blob_entries->size) {
1126                 connman_info("End of CHAIN 0x%x", offset);
1127                 return 0;
1128         }
1129
1130         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
1131                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
1132                         target->data, entry, entry->elems,
1133                         (char *)entry + entry->target_offset,
1134                                 entry->next_offset);
1135
1136                 return 0;
1137         } else if (builtin >= 0) {
1138                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
1139                         hooknames[builtin], entry, entry->elems,
1140                         (char *)entry + entry->target_offset,
1141                                 entry->next_offset);
1142         } else {
1143                 connman_info("RULE %p  match %p  target %p  size %d", entry,
1144                         entry->elems,
1145                         (char *)entry + entry->target_offset,
1146                                 entry->next_offset);
1147         }
1148
1149         dump_match(table, entry);
1150         dump_target(table, entry);
1151         dump_ip(entry);
1152
1153         return 0;
1154 }
1155
1156 static void iptables_dump(struct connman_iptables *table)
1157 {
1158         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
1159                         table->info->name,
1160                         table->info->valid_hooks, table->info->num_entries,
1161                                 table->info->size);
1162
1163         ENTRY_ITERATE(table->blob_entries->entrytable,
1164                         table->blob_entries->size,
1165                         dump_entry, table);
1166
1167 }
1168
1169 static int iptables_get_entries(struct connman_iptables *table)
1170 {
1171         socklen_t entry_size;
1172
1173         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
1174
1175         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
1176                                 table->blob_entries, &entry_size);
1177 }
1178
1179 static int iptables_replace(struct connman_iptables *table,
1180                                         struct ipt_replace *r)
1181 {
1182         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
1183                          sizeof(*r) + r->size);
1184 }
1185
1186 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
1187 {
1188         struct ipt_entry *new_entry;
1189         int builtin;
1190
1191         new_entry = g_try_malloc0(entry->next_offset);
1192         if (new_entry == NULL)
1193                 return -ENOMEM;
1194
1195         memcpy(new_entry, entry, entry->next_offset);
1196
1197         builtin = is_hook_entry(table, entry);
1198
1199         return iptables_add_entry(table, new_entry, NULL, builtin);
1200 }
1201
1202 static void table_cleanup(struct connman_iptables *table)
1203 {
1204         GList *list;
1205         struct connman_iptables_entry *entry;
1206
1207         if (table == NULL)
1208                 return;
1209
1210         close(table->ipt_sock);
1211
1212         for (list = table->entries; list; list = list->next) {
1213                 entry = list->data;
1214
1215                 g_free(entry->entry);
1216                 g_free(entry);
1217         }
1218
1219         g_list_free(table->entries);
1220         g_free(table->info);
1221         g_free(table->blob_entries);
1222         g_free(table);
1223 }
1224
1225 static struct connman_iptables *iptables_init(char *table_name)
1226 {
1227         struct connman_iptables *table = NULL;
1228         char *module = NULL;
1229         socklen_t s;
1230
1231         DBG("%s", table_name);
1232
1233         if (xtables_insmod("ip_tables", NULL, TRUE) != 0)
1234                 return NULL;
1235
1236         module = g_strconcat("iptable_", table_name, NULL);
1237         if (module == NULL)
1238                 return NULL;
1239
1240         if (xtables_insmod(module, NULL, TRUE) != 0) {
1241                 g_free(module);
1242                 return NULL;
1243         }
1244
1245         g_free(module);
1246
1247         table = g_hash_table_lookup(table_hash, table_name);
1248         if (table != NULL)
1249                 return table;
1250
1251         table = g_try_new0(struct connman_iptables, 1);
1252         if (table == NULL)
1253                 return NULL;
1254
1255         table->info = g_try_new0(struct ipt_getinfo, 1);
1256         if (table->info == NULL)
1257                 goto err;
1258
1259         table->ipt_sock = socket(AF_INET, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW);
1260         if (table->ipt_sock < 0)
1261                 goto err;
1262
1263         s = sizeof(*table->info);
1264         strcpy(table->info->name, table_name);
1265         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
1266                                                 table->info, &s) < 0)
1267                 goto err;
1268
1269         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
1270                                                 table->info->size);
1271         if (table->blob_entries == NULL)
1272                 goto err;
1273
1274         strcpy(table->blob_entries->name, table_name);
1275         table->blob_entries->size = table->info->size;
1276
1277         if (iptables_get_entries(table) < 0)
1278                 goto err;
1279
1280         table->num_entries = 0;
1281         table->old_entries = table->info->num_entries;
1282         table->size = 0;
1283
1284         memcpy(table->underflow, table->info->underflow,
1285                                 sizeof(table->info->underflow));
1286         memcpy(table->hook_entry, table->info->hook_entry,
1287                                 sizeof(table->info->hook_entry));
1288
1289         ENTRY_ITERATE(table->blob_entries->entrytable,
1290                         table->blob_entries->size,
1291                                 add_entry, table);
1292
1293         g_hash_table_insert(table_hash, g_strdup(table_name), table);
1294
1295         return table;
1296
1297 err:
1298         table_cleanup(table);
1299
1300         return NULL;
1301 }
1302
1303 static struct option iptables_opts[] = {
1304         {.name = "append",        .has_arg = 1, .val = 'A'},
1305         {.name = "compare",       .has_arg = 1, .val = 'C'},
1306         {.name = "delete",        .has_arg = 1, .val = 'D'},
1307         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
1308         {.name = "insert",        .has_arg = 1, .val = 'I'},
1309         {.name = "list",          .has_arg = 2, .val = 'L'},
1310         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
1311         {.name = "policy",        .has_arg = 1, .val = 'P'},
1312         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
1313         {.name = "destination",   .has_arg = 1, .val = 'd'},
1314         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
1315         {.name = "jump",          .has_arg = 1, .val = 'j'},
1316         {.name = "match",         .has_arg = 1, .val = 'm'},
1317         {.name = "out-interface", .has_arg = 1, .val = 'o'},
1318         {.name = "source",        .has_arg = 1, .val = 's'},
1319         {.name = "table",         .has_arg = 1, .val = 't'},
1320         {NULL},
1321 };
1322
1323 struct xtables_globals iptables_globals = {
1324         .option_offset = 0,
1325         .opts = iptables_opts,
1326         .orig_opts = iptables_opts,
1327 };
1328
1329 static struct xtables_target *prepare_target(struct connman_iptables *table,
1330                                                         char *target_name)
1331 {
1332         struct xtables_target *xt_t = NULL;
1333         gboolean is_builtin, is_user_defined;
1334         GList *chain_head = NULL;
1335         size_t target_size;
1336
1337         is_builtin = FALSE;
1338         is_user_defined = FALSE;
1339
1340         if (is_builtin_target(target_name))
1341                 is_builtin = TRUE;
1342         else {
1343                 chain_head = find_chain_head(table, target_name);
1344                 if (chain_head != NULL && chain_head->next != NULL)
1345                         is_user_defined = TRUE;
1346         }
1347
1348         if (is_builtin || is_user_defined)
1349                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1350                                                 XTF_LOAD_MUST_SUCCEED);
1351         else
1352                 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1353
1354         if (xt_t == NULL)
1355                 return NULL;
1356
1357         target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1358
1359         xt_t->t = g_try_malloc0(target_size);
1360         if (xt_t->t == NULL)
1361                 return NULL;
1362
1363         xt_t->t->u.target_size = target_size;
1364
1365         if (is_builtin || is_user_defined) {
1366                 struct xt_standard_target *target;
1367
1368                 target = (struct xt_standard_target *)(xt_t->t);
1369                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
1370
1371                 if (is_builtin == TRUE)
1372                         target->verdict = target_to_verdict(target_name);
1373                 else if (is_user_defined == TRUE) {
1374                         struct connman_iptables_entry *target_rule;
1375
1376                         if (chain_head == NULL) {
1377                                 g_free(xt_t->t);
1378                                 return NULL;
1379                         }
1380
1381                         target_rule = chain_head->next->data;
1382                         target->verdict = target_rule->offset;
1383                 }
1384         } else {
1385                 strcpy(xt_t->t->u.user.name, target_name);
1386                 xt_t->t->u.user.revision = xt_t->revision;
1387                 if (xt_t->init != NULL)
1388                         xt_t->init(xt_t->t);
1389         }
1390
1391 #if XTABLES_VERSION_CODE > 5
1392         if (xt_t->x6_options != NULL)
1393                 iptables_globals.opts =
1394                         xtables_options_xfrm(
1395                                 iptables_globals.orig_opts,
1396                                 iptables_globals.opts,
1397                                 xt_t->x6_options,
1398                                 &xt_t->option_offset);
1399         else
1400 #endif
1401                 iptables_globals.opts =
1402                         xtables_merge_options(
1403 #if XTABLES_VERSION_CODE > 5
1404                                 iptables_globals.orig_opts,
1405 #endif
1406                                 iptables_globals.opts,
1407                                 xt_t->extra_opts,
1408                                 &xt_t->option_offset);
1409
1410         if (iptables_globals.opts == NULL) {
1411                 g_free(xt_t->t);
1412                 xt_t = NULL;
1413         }
1414
1415         return xt_t;
1416 }
1417
1418 static struct xtables_match *prepare_matches(struct connman_iptables *table,
1419                         struct xtables_rule_match **xt_rm, char *match_name)
1420 {
1421         struct xtables_match *xt_m;
1422         size_t match_size;
1423
1424         if (match_name == NULL)
1425                 return NULL;
1426
1427         xt_m = xtables_find_match(match_name, XTF_LOAD_MUST_SUCCEED, xt_rm);
1428         match_size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
1429
1430         xt_m->m = g_try_malloc0(match_size);
1431         if (xt_m->m == NULL)
1432                 return NULL;
1433
1434         xt_m->m->u.match_size = match_size;
1435         strcpy(xt_m->m->u.user.name, xt_m->name);
1436         xt_m->m->u.user.revision = xt_m->revision;
1437
1438         if (xt_m->init != NULL)
1439                 xt_m->init(xt_m->m);
1440
1441         if (xt_m == xt_m->next)
1442                 goto done;
1443
1444 #if XTABLES_VERSION_CODE > 5
1445         if (xt_m->x6_options != NULL)
1446                 iptables_globals.opts =
1447                         xtables_options_xfrm(
1448                                 iptables_globals.orig_opts,
1449                                 iptables_globals.opts,
1450                                 xt_m->x6_options,
1451                                 &xt_m->option_offset);
1452         else
1453 #endif
1454                         iptables_globals.opts =
1455                         xtables_merge_options(
1456 #if XTABLES_VERSION_CODE > 5
1457                                 iptables_globals.orig_opts,
1458 #endif
1459                                 iptables_globals.opts,
1460                                 xt_m->extra_opts,
1461                                 &xt_m->option_offset);
1462
1463         if (iptables_globals.opts == NULL) {
1464                 g_free(xt_m->m);
1465                 xt_m = NULL;
1466         }
1467
1468 done:
1469         return xt_m;
1470 }
1471
1472 static int parse_ip_and_mask(const char *str, struct in_addr *ip, struct in_addr *mask)
1473 {
1474         char **tokens;
1475         uint32_t prefixlength;
1476         uint32_t tmp;
1477         int err;
1478
1479         tokens = g_strsplit(str, "/", 2);
1480         if (tokens == NULL)
1481                 return -1;
1482
1483         if (!inet_pton(AF_INET, tokens[0], ip)) {
1484                 err = -1;
1485                 goto out;
1486         }
1487
1488         if (tokens[1] != NULL) {
1489                 prefixlength = strtol(tokens[1], NULL, 10);
1490                 if (prefixlength > 31) {
1491                         err = -1;
1492                         goto out;
1493                 }
1494
1495                 tmp = ~(0xffffffff >> prefixlength);
1496         } else {
1497                 tmp = 0xffffffff;
1498         }
1499
1500         mask->s_addr = htonl(tmp);
1501         ip->s_addr = ip->s_addr & mask->s_addr;
1502         err = 0;
1503 out:
1504         g_strfreev(tokens);
1505
1506         return err;
1507 }
1508
1509 static int iptables_command(int argc, char *argv[])
1510 {
1511         struct connman_iptables *table;
1512         struct xtables_rule_match *xt_rm, *tmp_xt_rm;
1513         struct xtables_match *xt_m, *xt_m_t;
1514         struct xtables_target *xt_t;
1515         struct ipt_ip ip;
1516         char *table_name, *chain, *new_chain, *match_name, *target_name;
1517         char *flush_chain, *delete_chain, *policy;
1518         int c, ret, in_len, out_len;
1519         gboolean dump, invert, insert, delete, compare;
1520
1521         if (argc == 0)
1522                 return -EINVAL;
1523
1524         dump = FALSE;
1525         invert = FALSE;
1526         insert = FALSE;
1527         delete = FALSE;
1528         compare = FALSE;
1529         table_name = chain = new_chain = match_name = target_name = NULL;
1530         flush_chain = delete_chain = policy = NULL;
1531         memset(&ip, 0, sizeof(struct ipt_ip));
1532         table = NULL;
1533         xt_rm = NULL;
1534         xt_m = NULL;
1535         xt_t = NULL;
1536         ret = 0;
1537
1538         /* extension's options will generate false-positives errors */
1539         opterr = 0;
1540
1541         optind = 0;
1542
1543         while ((c = getopt_long(argc, argv,
1544                                         "-A:C:D:F:I:L::N:P:X:d:j:i:m:o:s:t:",
1545                                         iptables_globals.opts, NULL)) != -1) {
1546                 switch (c) {
1547                 case 'A':
1548                         /* It is either -A, -C, -D or -I at once */
1549                         if (chain)
1550                                 goto out;
1551
1552                         chain = optarg;
1553                         break;
1554
1555                 case 'C':
1556                         /* It is either -A, -C, -D or -I at once */
1557                         if (chain)
1558                                 goto out;
1559
1560                         chain = optarg;
1561                         compare = TRUE;
1562                         break;
1563
1564                 case 'D':
1565                         /* It is either -A, -C, -D or -I at once */
1566                         if (chain)
1567                                 goto out;
1568
1569                         chain = optarg;
1570                         delete = TRUE;
1571                         break;
1572
1573                 case 'F':
1574                         flush_chain = optarg;
1575                         break;
1576
1577                 case 'I':
1578                         /* It is either -A, -C, -D or -I at once */
1579                         if (chain)
1580                                 goto out;
1581
1582                         chain = optarg;
1583                         insert = TRUE;
1584                         break;
1585
1586                 case 'L':
1587                         dump = TRUE;
1588                         break;
1589
1590                 case 'N':
1591                         new_chain = optarg;
1592                         break;
1593
1594                 case 'P':
1595                         chain = optarg;
1596                         if (optind < argc)
1597                                 policy = argv[optind++];
1598                         else
1599                                 goto out;
1600
1601                         break;
1602
1603                 case 'X':
1604                         delete_chain = optarg;
1605                         break;
1606
1607                 case 'd':
1608                         if (!parse_ip_and_mask(optarg, &ip.dst, &ip.dmsk))
1609                                 break;
1610
1611                         if (invert)
1612                                 ip.invflags |= IPT_INV_DSTIP;
1613
1614                         break;
1615
1616                 case 'i':
1617                         in_len = strlen(optarg);
1618
1619                         if (in_len + 1 > IFNAMSIZ)
1620                                 break;
1621
1622                         strcpy(ip.iniface, optarg);
1623                         memset(ip.iniface_mask, 0xff, in_len + 1);
1624
1625                         if (invert)
1626                                 ip.invflags |= IPT_INV_VIA_IN;
1627
1628                         break;
1629
1630                 case 'j':
1631                         target_name = optarg;
1632                         xt_t = prepare_target(table, target_name);
1633                         if (xt_t == NULL)
1634                                 goto out;
1635
1636                         break;
1637
1638                 case 'm':
1639                         match_name = optarg;
1640                         xt_m = prepare_matches(table, &xt_rm, match_name);
1641                         if (xt_m == NULL)
1642                                 goto out;
1643
1644                         break;
1645
1646                 case 'o':
1647                         out_len = strlen(optarg);
1648
1649                         if (out_len + 1 > IFNAMSIZ)
1650                                 break;
1651
1652                         strcpy(ip.outiface, optarg);
1653                         memset(ip.outiface_mask, 0xff, out_len + 1);
1654
1655                         if (invert)
1656                                 ip.invflags |= IPT_INV_VIA_OUT;
1657
1658                         break;
1659
1660                 case 's':
1661                         if (!parse_ip_and_mask(optarg, &ip.src, &ip.smsk))
1662                                 break;
1663
1664                         if (invert)
1665                                 ip.invflags |= IPT_INV_SRCIP;
1666
1667                         break;
1668
1669                 case 't':
1670                         table_name = optarg;
1671
1672                         table = iptables_init(table_name);
1673                         if (table == NULL) {
1674                                 ret = -EINVAL;
1675                                 goto out;
1676                         }
1677
1678                         break;
1679
1680                 case 1:
1681                         if (optarg[0] == '!' && optarg[1] == '\0') {
1682                                 invert = TRUE;
1683                                 optarg[0] = '\0';
1684                                 continue;
1685                         }
1686
1687                         connman_error("Invalid option");
1688
1689                         ret = -EINVAL;
1690                         goto out;
1691
1692                 default:
1693 #if XTABLES_VERSION_CODE > 5
1694                         if (xt_t != NULL && (xt_t->x6_parse != NULL ||
1695                                                 xt_t->parse != NULL) &&
1696                                         (c >= (int) xt_t->option_offset &&
1697                                         c < (int) xt_t->option_offset +
1698                                         XT_OPTION_OFFSET_SCALE)) {
1699                                 xtables_option_tpcall(c, argv,
1700                                                         invert, xt_t, NULL);
1701
1702                                 break;
1703                         }
1704
1705                         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1706                                                 tmp_xt_rm = tmp_xt_rm->next) {
1707                                 xt_m_t = tmp_xt_rm->match;
1708
1709                                 if (tmp_xt_rm->completed ||
1710                                                 (xt_m_t->x6_parse == NULL &&
1711                                                  xt_m_t->parse == NULL))
1712                                         continue;
1713
1714                                 if (c < (int) xt_m_t->option_offset ||
1715                                         c >= (int) xt_m_t->option_offset
1716                                         + XT_OPTION_OFFSET_SCALE)
1717                                         continue;
1718
1719                                 xtables_option_mpcall(c, argv,
1720                                                         invert, xt_m_t, NULL);
1721
1722                                 break;
1723                         }
1724 #else
1725                         if (xt_t == NULL || xt_t->parse == NULL ||
1726                                 !xt_t->parse(c - xt_t->option_offset,
1727                                 argv, invert, &xt_t->tflags, NULL, &xt_t->t)) {
1728
1729                                 for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1730                                                 tmp_xt_rm = tmp_xt_rm->next) {
1731                                         xt_m_t = tmp_xt_rm->match;
1732
1733                                         if (tmp_xt_rm->completed ||
1734                                                         xt_m_t->parse == NULL)
1735                                                 continue;
1736
1737                                         if (xt_m->parse(c - xt_m->option_offset,
1738                                                 argv, invert, &xt_m->mflags,
1739                                                 NULL, &xt_m->m))
1740                                                 break;
1741                                 }
1742                         }
1743 #endif
1744                         break;
1745                 }
1746
1747                 invert = FALSE;
1748         }
1749
1750 #if XTABLES_VERSION_CODE > 5
1751         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1752                                 tmp_xt_rm = tmp_xt_rm->next)
1753                 xtables_option_mfcall(tmp_xt_rm->match);
1754
1755         if (xt_t != NULL)
1756                 xtables_option_tfcall(xt_t);
1757 #else
1758         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1759                                 tmp_xt_rm = tmp_xt_rm->next)
1760                 if (tmp_xt_rm->match->final_check != NULL)
1761                         tmp_xt_rm->match->final_check(
1762                                         tmp_xt_rm->match->mflags);
1763
1764         if (xt_t != NULL && xt_t->final_check != NULL)
1765                 xt_t->final_check(xt_t->tflags);
1766 #endif
1767
1768         if (table == NULL) {
1769                 table_name = "filter";
1770
1771                 table = iptables_init(table_name);
1772                 if (table == NULL) {
1773                         ret = -EINVAL;
1774                         goto out;
1775                 }
1776         }
1777
1778         if (delete_chain != NULL) {
1779                 printf("Delete chain %s\n", delete_chain);
1780
1781                 iptables_delete_chain(table, delete_chain);
1782
1783                 goto out;
1784         }
1785
1786         if (dump) {
1787                 iptables_dump(table);
1788
1789                 ret = 0;
1790                 goto out;
1791         }
1792
1793         if (flush_chain) {
1794                 DBG("Flush chain %s", flush_chain);
1795
1796                 iptables_flush_chain(table, flush_chain);
1797
1798                 goto out;
1799         }
1800
1801         if (chain && new_chain) {
1802                 ret = -EINVAL;
1803                 goto out;
1804         }
1805
1806         if (new_chain) {
1807                 DBG("New chain %s", new_chain);
1808
1809                 ret = iptables_add_chain(table, new_chain);
1810                 goto out;
1811         }
1812
1813         if (chain) {
1814                 if (policy != NULL) {
1815                         printf("Changing policy of %s to %s\n", chain, policy);
1816
1817                         iptables_change_policy(table, chain, policy);
1818
1819                         goto out;
1820                 }
1821
1822                 if (xt_t == NULL)
1823                         goto out;
1824
1825                 if (compare == TRUE) {
1826                         ret = iptables_compare_rule(table, &ip, chain,
1827                                         target_name, xt_t, xt_m, xt_rm);
1828                         goto out;
1829                 }
1830
1831                 if (delete == TRUE) {
1832                         DBG("Deleting %s to %s (match %s)\n",
1833                                         target_name, chain, match_name);
1834
1835                         ret = iptables_delete_rule(table, &ip, chain,
1836                                         target_name, xt_t, xt_m, xt_rm);
1837
1838                         goto out;
1839                 }
1840
1841                 if (insert == TRUE) {
1842                         DBG("Inserting %s to %s (match %s)",
1843                                         target_name, chain, match_name);
1844
1845                         ret = iptables_insert_rule(table, &ip, chain,
1846                                                 target_name, xt_t, xt_rm);
1847
1848                         goto out;
1849                 } else {
1850                         DBG("Adding %s to %s (match %s)",
1851                                         target_name, chain, match_name);
1852
1853                         ret = iptables_append_rule(table, &ip, chain,
1854                                                 target_name, xt_t, xt_rm);
1855
1856                         goto out;
1857                 }
1858         }
1859
1860 out:
1861         if (xt_t)
1862                 g_free(xt_t->t);
1863
1864         if (xt_m)
1865                 g_free(xt_m->m);
1866
1867         return ret;
1868 }
1869
1870 int __connman_iptables_command(const char *format, ...)
1871 {
1872         char **argv, **arguments, *command;
1873         int argc, i, ret;
1874         va_list args;
1875
1876         if (format == NULL)
1877                 return -EINVAL;
1878
1879         va_start(args, format);
1880
1881         command = g_strdup_vprintf(format, args);
1882
1883         va_end(args);
1884
1885         if (command == NULL)
1886                 return -ENOMEM;
1887
1888         arguments = g_strsplit_set(command, " ", -1);
1889
1890         for (argc = 0; arguments[argc]; argc++);
1891         ++argc;
1892
1893         DBG("command %s argc %d", command, argc);
1894
1895         argv = g_try_malloc0(argc * sizeof(char *));
1896         if (argv == NULL) {
1897                 g_free(command);
1898                 g_strfreev(arguments);
1899                 return -ENOMEM;
1900         }
1901
1902         argv[0] = "iptables";
1903         for (i = 1; i < argc; i++)
1904                 argv[i] = arguments[i - 1];
1905
1906         ret = iptables_command(argc, argv);
1907
1908         g_free(command);
1909         g_strfreev(arguments);
1910         g_free(argv);
1911
1912         return ret;
1913 }
1914
1915
1916 int __connman_iptables_commit(const char *table_name)
1917 {
1918         struct connman_iptables *table;
1919         struct ipt_replace *repl;
1920         int err;
1921
1922         DBG("%s", table_name);
1923
1924         table = g_hash_table_lookup(table_hash, table_name);
1925         if (table == NULL)
1926                 return -EINVAL;
1927
1928         repl = iptables_blob(table);
1929
1930         err = iptables_replace(table, repl);
1931
1932         g_free(repl->counters);
1933         g_free(repl);
1934
1935         if (err < 0)
1936             return err;
1937
1938         g_hash_table_remove(table_hash, table_name);
1939
1940         return 0;
1941 }
1942
1943 static void remove_table(gpointer user_data)
1944 {
1945         struct connman_iptables *table = user_data;
1946
1947         table_cleanup(table);
1948 }
1949
1950 int __connman_iptables_init(void)
1951 {
1952         DBG("");
1953
1954         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1955                                                 g_free, remove_table);
1956
1957         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1958
1959         return 0;
1960
1961 }
1962
1963 void __connman_iptables_cleanup(void)
1964 {
1965         DBG("");
1966
1967         g_hash_table_destroy(table_hash);
1968
1969         xtables_free_opts(1);
1970 }