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 /* fn returns 0 to continue iteration */
  54 #define _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
  55 ({                                                              \
  56         unsigned int __i;                                       \
  57         int __n;                                                \
  58         int __ret = 0;                                          \
  59         type *__entry;                                          \
  60                                                                 \
  61         for (__i = 0, __n = 0; __i < (size);                    \
  62              __i += __entry->next_offset, __n++) {              \
  63                 __entry = (void *)(entries) + __i;              \
  64                 if (__n < n)                                    \
  65                         continue;                               \
  66                                                                 \
  67                 __ret = fn(__entry,  ## args);                  \
  68                 if (__ret != 0)                                 \
  69                         break;                                  \
  70         }                                                       \
  71         __ret;                                                  \
  72 })
  73
  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)
  77
  78 #define ENTRY_ITERATE(entries, size, fn, args...) \
  79         _XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
  80
  81 #define MIN_ALIGN (__alignof__(struct ipt_entry))
  82
  83 #define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
  84
  85 struct error_target {
  86         struct xt_entry_target t;
  87         char error[IPT_TABLE_MAXNAMELEN];
  88 };
  89
  90 struct connman_iptables_entry {
  91         int offset;
  92         int builtin;
  93
  94         struct ipt_entry *entry;
  95 };
  96
  97 struct connman_iptables {
  98         int ipt_sock;
  99
 100         struct ipt_getinfo *info;
 101         struct ipt_get_entries *blob_entries;
 102
 103         unsigned int num_entries;
 104         unsigned int old_entries;
 105         unsigned int size;
 106
 107         unsigned int underflow[NF_INET_NUMHOOKS];
 108         unsigned int hook_entry[NF_INET_NUMHOOKS];
 109
 110         GList *entries;
 111 };
 112
 113 static GHashTable *table_hash = NULL;
 114
 115 static struct ipt_entry *get_entry(struct connman_iptables *table,
 116                                         unsigned int offset)
 117 {
 118         return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
 119                                                                         offset);
 120 }
 121
 122 static int is_hook_entry(struct connman_iptables *table,
 123                                 struct ipt_entry *entry)
 124 {
 125         unsigned int i;
 126
 127         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 128                 if ((table->info->valid_hooks & (1 << i))
 129                 && get_entry(table, table->info->hook_entry[i]) == entry)
 130                         return i;
 131         }
 132
 133         return -1;
 134 }
 135
 136 static unsigned long entry_to_offset(struct connman_iptables *table,
 137                                         struct ipt_entry *entry)
 138 {
 139         return (void *)entry - (void *)table->blob_entries->entrytable;
 140 }
 141
 142 static int target_to_verdict(char *target_name)
 143 {
 144         if (!strcmp(target_name, LABEL_ACCEPT))
 145                 return -NF_ACCEPT - 1;
 146
 147         if (!strcmp(target_name, LABEL_DROP))
 148                 return -NF_DROP - 1;
 149
 150         if (!strcmp(target_name, LABEL_QUEUE))
 151                 return -NF_QUEUE - 1;
 152
 153         if (!strcmp(target_name, LABEL_RETURN))
 154                 return XT_RETURN;
 155
 156         return 0;
 157 }
 158
 159 static gboolean is_builtin_target(char *target_name)
 160 {
 161         if (!strcmp(target_name, LABEL_ACCEPT) ||
 162                 !strcmp(target_name, LABEL_DROP) ||
 163                 !strcmp(target_name, LABEL_QUEUE) ||
 164                 !strcmp(target_name, LABEL_RETURN))
 165                 return TRUE;
 166
 167         return FALSE;
 168 }
 169
 170 static gboolean is_jump(struct connman_iptables_entry *e)
 171 {
 172         struct xt_entry_target *target;
 173
 174         target = ipt_get_target(e->entry);
 175
 176         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 177                 struct xt_standard_target *t;
 178
 179                 t = (struct xt_standard_target *)target;
 180
 181                 switch (t->verdict) {
 182                 case XT_RETURN:
 183                 case -NF_ACCEPT - 1:
 184                 case -NF_DROP - 1:
 185                 case -NF_QUEUE - 1:
 186                 case -NF_STOP - 1:
 187                         return false;
 188
 189                 default:
 190                         return true;
 191                 }
 192         }
 193
 194         return false;
 195 }
 196
 197 static gboolean is_chain(struct connman_iptables *table,
 198                                 struct connman_iptables_entry *e)
 199 {
 200         struct ipt_entry *entry;
 201         struct xt_entry_target *target;
 202
 203         entry = e->entry;
 204         if (e->builtin >= 0)
 205                 return TRUE;
 206
 207         target = ipt_get_target(entry);
 208         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
 209                 return TRUE;
 210
 211         return FALSE;
 212 }
 213
 214 static GList *find_chain_head(struct connman_iptables *table,
 215                                 char *chain_name)
 216 {
 217         GList *list;
 218         struct connman_iptables_entry *head;
 219         struct ipt_entry *entry;
 220         struct xt_entry_target *target;
 221         int builtin;
 222
 223         for (list = table->entries; list; list = list->next) {
 224                 head = list->data;
 225                 entry = head->entry;
 226
 227                 /* Buit-in chain */
 228                 builtin = head->builtin;
 229                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 230                         break;
 231
 232                 /* User defined chain */
 233                 target = ipt_get_target(entry);
 234                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 235                     !strcmp((char *)target->data, chain_name))
 236                         break;
 237         }
 238
 239         return list;
 240 }
 241
 242 static GList *find_chain_tail(struct connman_iptables *table,
 243                                 char *chain_name)
 244 {
 245         struct connman_iptables_entry *tail;
 246         GList *chain_head, *list;
 247
 248         chain_head = find_chain_head(table, chain_name);
 249         if (chain_head == NULL)
 250                 return NULL;
 251
 252         /* Then we look for the next chain */
 253         for (list = chain_head->next; list; list = list->next) {
 254                 tail = list->data;
 255
 256                 if (is_chain(table, tail))
 257                         return list;
 258         }
 259
 260         /* Nothing found, we return the table end */
 261         return g_list_last(table->entries);
 262 }
 263
 264
 265 static void update_offsets(struct connman_iptables *table)
 266 {
 267         GList *list, *prev;
 268         struct connman_iptables_entry *entry, *prev_entry;
 269
 270         for (list = table->entries; list; list = list->next) {
 271                 entry = list->data;
 272
 273                 if (list == table->entries) {
 274                         entry->offset = 0;
 275
 276                         continue;
 277                 }
 278
 279                 prev = list->prev;
 280                 prev_entry = prev->data;
 281
 282                 entry->offset = prev_entry->offset +
 283                                         prev_entry->entry->next_offset;
 284         }
 285 }
 286
 287 static void update_targets_reference(struct connman_iptables *table,
 288                                 struct connman_iptables_entry *entry_before,
 289                                 struct connman_iptables_entry *modified_entry,
 290                                 gboolean is_removing)
 291 {
 292         struct connman_iptables_entry *tmp;
 293         struct xt_standard_target *t;
 294         GList *list;
 295         int offset;
 296
 297         offset = modified_entry->entry->next_offset;
 298
 299         for (list = table->entries; list; list = list->next) {
 300                 tmp = list->data;
 301
 302                 if (!is_jump(tmp))
 303                         continue;
 304
 305                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 306
 307                 if (is_removing == TRUE) {
 308                         if (t->verdict >= entry_before->offset)
 309                                 t->verdict -= offset;
 310                 } else {
 311                         if (t->verdict > entry_before->offset)
 312                                 t->verdict += offset;
 313                 }
 314         }
 315 }
 316
 317 static int iptables_add_entry(struct connman_iptables *table,
 318                                 struct ipt_entry *entry, GList *before,
 319                                         int builtin)
 320 {
 321         struct connman_iptables_entry *e, *entry_before;
 322
 323         if (table == NULL)
 324                 return -1;
 325
 326         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 327         if (e == NULL)
 328                 return -1;
 329
 330         e->entry = entry;
 331         e->builtin = builtin;
 332
 333         table->entries = g_list_insert_before(table->entries, before, e);
 334         table->num_entries++;
 335         table->size += entry->next_offset;
 336
 337         if (before == NULL) {
 338                 e->offset = table->size - entry->next_offset;
 339
 340                 return 0;
 341         }
 342
 343         entry_before = before->data;
 344
 345         /*
 346          * We've just appended/insterted a new entry. All references
 347          * should be bumped accordingly.
 348          */
 349         update_targets_reference(table, entry_before, e, FALSE);
 350
 351         update_offsets(table);
 352
 353         return 0;
 354 }
 355
 356 static int remove_table_entry(struct connman_iptables *table,
 357                                 struct connman_iptables_entry *entry)
 358 {
 359         int removed = 0;
 360
 361         table->num_entries--;
 362         table->size -= entry->entry->next_offset;
 363         removed = entry->entry->next_offset;
 364
 365         g_free(entry->entry);
 366
 367         table->entries = g_list_remove(table->entries, entry);
 368
 369         return removed;
 370 }
 371
 372 static int iptables_flush_chain(struct connman_iptables *table,
 373                                                 char *name)
 374 {
 375         GList *chain_head, *chain_tail, *list, *next;
 376         struct connman_iptables_entry *entry;
 377         int builtin, removed = 0;
 378
 379         chain_head = find_chain_head(table, name);
 380         if (chain_head == NULL)
 381                 return -EINVAL;
 382
 383         chain_tail = find_chain_tail(table, name);
 384         if (chain_tail == NULL)
 385                 return -EINVAL;
 386
 387         entry = chain_head->data;
 388         builtin = entry->builtin;
 389
 390         if (builtin >= 0)
 391                 list = chain_head;
 392         else
 393                 list = chain_head->next;
 394
 395         if (list == chain_tail->prev)
 396                 return 0;
 397
 398         while (list != chain_tail->prev) {
 399                 entry = list->data;
 400                 next = g_list_next(list);
 401
 402                 removed += remove_table_entry(table, entry);
 403
 404                 list = next;
 405         }
 406
 407         if (builtin >= 0) {
 408                 struct connman_iptables_entry *e;
 409
 410                 entry = list->data;
 411
 412                 entry->builtin = builtin;
 413
 414                 table->underflow[builtin] -= removed;
 415
 416                 for (list = chain_tail; list; list = list->next) {
 417                         e = list->data;
 418
 419                         builtin = e->builtin;
 420                         if (builtin < 0)
 421                                 continue;
 422
 423                         table->hook_entry[builtin] -= removed;
 424                         table->underflow[builtin] -= removed;
 425                 }
 426         }
 427
 428         update_offsets(table);
 429
 430         return 0;
 431 }
 432
 433 static int iptables_add_chain(struct connman_iptables *table,
 434                                         char *name)
 435 {
 436         GList *last;
 437         struct ipt_entry *entry_head;
 438         struct ipt_entry *entry_return;
 439         struct error_target *error;
 440         struct ipt_standard_target *standard;
 441         u_int16_t entry_head_size, entry_return_size;
 442
 443         last = g_list_last(table->entries);
 444
 445         /*
 446          * An empty chain is composed of:
 447          * - A head entry, with no match and an error target.
 448          *   The error target data is the chain name.
 449          * - A tail entry, with no match and a standard target.
 450          *   The standard target verdict is XT_RETURN (return to the
 451          *   caller).
 452          */
 453
 454         /* head entry */
 455         entry_head_size = sizeof(struct ipt_entry) +
 456                                 sizeof(struct error_target);
 457         entry_head = g_try_malloc0(entry_head_size);
 458         if (entry_head == NULL)
 459                 goto err_head;
 460
 461         memset(entry_head, 0, entry_head_size);
 462
 463         entry_head->target_offset = sizeof(struct ipt_entry);
 464         entry_head->next_offset = entry_head_size;
 465
 466         error = (struct error_target *) entry_head->elems;
 467         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 468         error->t.u.user.target_size = ALIGN(sizeof(struct error_target));
 469         strcpy(error->error, name);
 470
 471         if (iptables_add_entry(table, entry_head, last, -1) < 0)
 472                 goto err_head;
 473
 474         /* tail entry */
 475         entry_return_size = sizeof(struct ipt_entry) +
 476                                 sizeof(struct ipt_standard_target);
 477         entry_return = g_try_malloc0(entry_return_size);
 478         if (entry_return == NULL)
 479                 goto err;
 480
 481         memset(entry_return, 0, entry_return_size);
 482
 483         entry_return->target_offset = sizeof(struct ipt_entry);
 484         entry_return->next_offset = entry_return_size;
 485
 486         standard = (struct ipt_standard_target *) entry_return->elems;
 487         standard->target.u.user.target_size =
 488                                 ALIGN(sizeof(struct ipt_standard_target));
 489         standard->verdict = XT_RETURN;
 490
 491         if (iptables_add_entry(table, entry_return, last, -1) < 0)
 492                 goto err;
 493
 494         return 0;
 495
 496 err:
 497         g_free(entry_return);
 498 err_head:
 499         g_free(entry_head);
 500
 501         return -ENOMEM;
 502 }
 503
 504 static int iptables_delete_chain(struct connman_iptables *table, char *name)
 505 {
 506         struct connman_iptables_entry *entry;
 507         GList *chain_head, *chain_tail;
 508
 509         chain_head = find_chain_head(table, name);
 510         if (chain_head == NULL)
 511                 return -EINVAL;
 512
 513         entry = chain_head->data;
 514
 515         /* We cannot remove builtin chain */
 516         if (entry->builtin >= 0)
 517                 return -EINVAL;
 518
 519         chain_tail = find_chain_tail(table, name);
 520         if (chain_tail == NULL)
 521                 return -EINVAL;
 522
 523         /* Chain must be flushed */
 524         if (chain_head->next != chain_tail->prev)
 525                 return -EINVAL;
 526
 527         remove_table_entry(table, entry);
 528
 529         entry = chain_tail->prev->data;
 530         remove_table_entry(table, entry);
 531
 532         update_offsets(table);
 533
 534         return 0;
 535 }
 536
 537 static struct ipt_entry *new_rule(struct ipt_ip *ip,
 538                 char *target_name, struct xtables_target *xt_t,
 539                 char *match_name, struct xtables_match *xt_m)
 540 {
 541         struct ipt_entry *new_entry;
 542         size_t match_size, target_size;
 543
 544         if (xt_m)
 545                 match_size = xt_m->m->u.match_size;
 546         else
 547                 match_size = 0;
 548
 549         if (xt_t)
 550                 target_size = ALIGN(xt_t->t->u.target_size);
 551         else
 552                 target_size = ALIGN(sizeof(struct xt_standard_target));
 553
 554         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 555                                                                 match_size);
 556         if (new_entry == NULL)
 557                 return NULL;
 558
 559         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 560
 561         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 562         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 563                                                                 match_size;
 564         if (xt_m) {
 565                 struct xt_entry_match *entry_match;
 566
 567                 entry_match = (struct xt_entry_match *)new_entry->elems;
 568                 memcpy(entry_match, xt_m->m, match_size);
 569         }
 570
 571         if (xt_t) {
 572                 struct xt_entry_target *entry_target;
 573
 574                 entry_target = ipt_get_target(new_entry);
 575                 memcpy(entry_target, xt_t->t, target_size);
 576         }
 577
 578         return new_entry;
 579 }
 580
 581 static void update_hooks(struct connman_iptables *table, GList *chain_head,
 582                                 struct ipt_entry *entry)
 583 {
 584         GList *list;
 585         struct connman_iptables_entry *head, *e;
 586         int builtin;
 587
 588         if (chain_head == NULL)
 589                 return;
 590
 591         head = chain_head->data;
 592
 593         builtin = head->builtin;
 594         if (builtin < 0)
 595                 return;
 596
 597         table->underflow[builtin] += entry->next_offset;
 598
 599         for (list = chain_head->next; list; list = list->next) {
 600                 e = list->data;
 601
 602                 builtin = e->builtin;
 603                 if (builtin < 0)
 604                         continue;
 605
 606                 table->hook_entry[builtin] += entry->next_offset;
 607                 table->underflow[builtin] += entry->next_offset;
 608         }
 609 }
 610
 611 static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
 612                                 struct ipt_ip *ip, char *chain_name,
 613                                 char *target_name, struct xtables_target *xt_t,
 614                                 char *match_name, struct xtables_match *xt_m,
 615                                 int *builtin)
 616 {
 617         GList *chain_tail, *chain_head;
 618         struct ipt_entry *new_entry;
 619         struct connman_iptables_entry *head;
 620
 621         chain_head = find_chain_head(table, chain_name);
 622         if (chain_head == NULL)
 623                 return NULL;
 624
 625         chain_tail = find_chain_tail(table, chain_name);
 626         if (chain_tail == NULL)
 627                 return NULL;
 628
 629         new_entry = new_rule(ip, target_name, xt_t, match_name, xt_m);
 630         if (new_entry == NULL)
 631                 return NULL;
 632
 633         update_hooks(table, chain_head, new_entry);
 634
 635         /*
 636          * If the chain is builtin, and does not have any rule,
 637          * then the one that we're inserting is becoming the head
 638          * and thus needs the builtin flag.
 639          */
 640         head = chain_head->data;
 641         if (head->builtin < 0)
 642                 *builtin = -1;
 643         else if (chain_head == chain_tail->prev) {
 644                 *builtin = head->builtin;
 645                 head->builtin = -1;
 646         }
 647
 648         return new_entry;
 649 }
 650
 651 static int iptables_append_rule(struct connman_iptables *table,
 652                                 struct ipt_ip *ip, char *chain_name,
 653                                 char *target_name, struct xtables_target *xt_t,
 654                                 char *match_name, struct xtables_match *xt_m)
 655 {
 656         GList *chain_tail;
 657         struct ipt_entry *new_entry;
 658         int builtin = -1, ret;
 659
 660         DBG("");
 661
 662         chain_tail = find_chain_tail(table, chain_name);
 663         if (chain_tail == NULL)
 664                 return -EINVAL;
 665
 666         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 667                         target_name, xt_t, match_name, xt_m, &builtin);
 668         if (new_entry == NULL)
 669                 return -EINVAL;
 670
 671         ret = iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
 672         if (ret < 0)
 673                 g_free(new_entry);
 674
 675         return ret;
 676 }
 677
 678 static int iptables_insert_rule(struct connman_iptables *table,
 679                                 struct ipt_ip *ip, char *chain_name,
 680                                 char *target_name, struct xtables_target *xt_t,
 681                                 char *match_name, struct xtables_match *xt_m)
 682 {
 683         struct ipt_entry *new_entry;
 684         int builtin = -1, ret;
 685         GList *chain_head;
 686
 687         chain_head = find_chain_head(table, chain_name);
 688         if (chain_head == NULL)
 689                 return -EINVAL;
 690
 691         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 692                         target_name, xt_t, match_name, xt_m, &builtin);
 693         if (new_entry == NULL)
 694                 return -EINVAL;
 695
 696         ret = iptables_add_entry(table, new_entry, chain_head->next, builtin);
 697         if (ret < 0)
 698                 g_free(new_entry);
 699
 700         return ret;
 701 }
 702
 703 static gboolean is_same_ipt_entry(struct ipt_entry *i_e1,
 704                                         struct ipt_entry *i_e2)
 705 {
 706         if (memcmp(&i_e1->ip, &i_e2->ip, sizeof(struct ipt_ip)) != 0)
 707                 return FALSE;
 708
 709         if (i_e1->target_offset != i_e2->target_offset)
 710                 return FALSE;
 711
 712         if (i_e1->next_offset != i_e2->next_offset)
 713                 return FALSE;
 714
 715         return TRUE;
 716 }
 717
 718 static gboolean is_same_target(struct xt_entry_target *xt_e_t1,
 719                                         struct xt_entry_target *xt_e_t2)
 720 {
 721         if (xt_e_t1 == NULL || xt_e_t2 == NULL)
 722                 return FALSE;
 723
 724         if (strcmp(xt_e_t1->u.user.name, IPT_STANDARD_TARGET) == 0) {
 725                 struct xt_standard_target *xt_s_t1;
 726                 struct xt_standard_target *xt_s_t2;
 727
 728                 xt_s_t1 = (struct xt_standard_target *) xt_e_t1;
 729                 xt_s_t2 = (struct xt_standard_target *) xt_e_t2;
 730
 731                 if (xt_s_t1->verdict != xt_s_t2->verdict)
 732                         return FALSE;
 733         } else {
 734                 if (xt_e_t1->u.target_size != xt_e_t2->u.target_size)
 735                         return FALSE;
 736
 737                 if (strcmp(xt_e_t1->u.user.name, xt_e_t2->u.user.name) != 0)
 738                         return FALSE;
 739         }
 740
 741         return TRUE;
 742 }
 743
 744 static gboolean is_same_match(struct xt_entry_match *xt_e_m1,
 745                                 struct xt_entry_match *xt_e_m2)
 746 {
 747         if (xt_e_m1 == NULL || xt_e_m2 == NULL)
 748                 return FALSE;
 749
 750         if (xt_e_m1->u.match_size != xt_e_m2->u.match_size)
 751                 return FALSE;
 752
 753         if (xt_e_m1->u.user.revision != xt_e_m2->u.user.revision)
 754                 return FALSE;
 755
 756         if (strcmp(xt_e_m1->u.user.name, xt_e_m2->u.user.name) != 0)
 757                 return FALSE;
 758
 759         return TRUE;
 760 }
 761
 762 static int iptables_delete_rule(struct connman_iptables *table,
 763                                 struct ipt_ip *ip, char *chain_name,
 764                                 char *target_name, struct xtables_target *xt_t,
 765                                 char *match_name, struct xtables_match *xt_m)
 766 {
 767         GList *chain_tail, *chain_head, *list;
 768         struct xt_entry_target *xt_e_t = NULL;
 769         struct xt_entry_match *xt_e_m = NULL;
 770         struct connman_iptables_entry *entry;
 771         struct ipt_entry *entry_test;
 772         int builtin, removed;
 773
 774         removed = 0;
 775
 776         chain_head = find_chain_head(table, chain_name);
 777         if (chain_head == NULL)
 778                 return -EINVAL;
 779
 780         chain_tail = find_chain_tail(table, chain_name);
 781         if (chain_tail == NULL)
 782                 return -EINVAL;
 783
 784         if (!xt_t && !xt_m)
 785                 return -EINVAL;
 786
 787         entry_test = new_rule(ip, target_name, xt_t, match_name, xt_m);
 788         if (entry_test == NULL)
 789                 return -EINVAL;
 790
 791         if (xt_t != NULL)
 792                 xt_e_t = ipt_get_target(entry_test);
 793         if (xt_m != NULL)
 794                 xt_e_m = (struct xt_entry_match *)entry_test->elems;
 795
 796         entry = chain_head->data;
 797         builtin = entry->builtin;
 798
 799         if (builtin >= 0)
 800                 list = chain_head;
 801         else
 802                 list = chain_head->next;
 803
 804         for (entry = NULL; list != chain_tail->prev; list = list->next) {
 805                 struct connman_iptables_entry *tmp;
 806                 struct ipt_entry *tmp_e;
 807
 808                 tmp = list->data;
 809                 tmp_e = tmp->entry;
 810
 811                 if (is_same_ipt_entry(entry_test, tmp_e) == FALSE)
 812                         continue;
 813
 814                 if (xt_t != NULL) {
 815                         struct xt_entry_target *tmp_xt_e_t;
 816
 817                         tmp_xt_e_t = ipt_get_target(tmp_e);
 818
 819                         if (!is_same_target(tmp_xt_e_t, xt_e_t))
 820                                 continue;
 821                 }
 822
 823                 if (xt_m != NULL) {
 824                         struct xt_entry_match *tmp_xt_e_m;
 825
 826                         tmp_xt_e_m = (struct xt_entry_match *)tmp_e->elems;
 827
 828                         if (!is_same_match(tmp_xt_e_m, xt_e_m))
 829                                 continue;
 830                 }
 831
 832                 entry = tmp;
 833                 break;
 834         }
 835
 836         if (entry == NULL) {
 837                 g_free(entry_test);
 838                 return -EINVAL;
 839         }
 840
 841         /* We have deleted a rule,
 842          * all references should be bumped accordingly */
 843         if (list->next != NULL)
 844                 update_targets_reference(table, list->next->data,
 845                                                 list->data, TRUE);
 846
 847         removed += remove_table_entry(table, entry);
 848
 849         if (builtin >= 0) {
 850                 list = list->next;
 851                 if (list) {
 852                         entry = list->data;
 853                         entry->builtin = builtin;
 854                 }
 855
 856                 table->underflow[builtin] -= removed;
 857                 for (list = chain_tail; list; list = list->next) {
 858                         entry = list->data;
 859
 860                         builtin = entry->builtin;
 861                         if (builtin < 0)
 862                                 continue;
 863
 864                         table->hook_entry[builtin] -= removed;
 865                         table->underflow[builtin] -= removed;
 866                 }
 867         }
 868
 869         update_offsets(table);
 870
 871         return 0;
 872 }
 873
 874 static struct ipt_replace *iptables_blob(struct connman_iptables *table)
 875 {
 876         struct ipt_replace *r;
 877         GList *list;
 878         struct connman_iptables_entry *e;
 879         unsigned char *entry_index;
 880
 881         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 882         if (r == NULL)
 883                 return NULL;
 884
 885         memset(r, 0, sizeof(*r) + table->size);
 886
 887         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 888                                 * table->old_entries);
 889         if (r->counters == NULL) {
 890                 g_free(r);
 891                 return NULL;
 892         }
 893
 894         strcpy(r->name, table->info->name);
 895         r->num_entries = table->num_entries;
 896         r->size = table->size;
 897
 898         r->num_counters = table->old_entries;
 899         r->valid_hooks  = table->info->valid_hooks;
 900
 901         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 902         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 903
 904         entry_index = (unsigned char *)r->entries;
 905         for (list = table->entries; list; list = list->next) {
 906                 e = list->data;
 907
 908                 memcpy(entry_index, e->entry, e->entry->next_offset);
 909                 entry_index += e->entry->next_offset;
 910         }
 911
 912         return r;
 913 }
 914
 915 static void dump_ip(struct ipt_entry *entry)
 916 {
 917         struct ipt_ip *ip = &entry->ip;
 918         char ip_string[INET6_ADDRSTRLEN];
 919         char ip_mask[INET6_ADDRSTRLEN];
 920
 921         if (strlen(ip->iniface))
 922                 connman_info("\tin %s", ip->iniface);
 923
 924         if (strlen(ip->outiface))
 925                 connman_info("\tout %s", ip->outiface);
 926
 927         if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
 928                         inet_ntop(AF_INET, &ip->smsk,
 929                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 930                 connman_info("\tsrc %s/%s", ip_string, ip_mask);
 931
 932         if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
 933                         inet_ntop(AF_INET, &ip->dmsk,
 934                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 935                 connman_info("\tdst %s/%s", ip_string, ip_mask);
 936 }
 937
 938 static void dump_target(struct connman_iptables *table,
 939                                 struct ipt_entry *entry)
 940
 941 {
 942         struct xtables_target *xt_t;
 943         struct xt_entry_target *target;
 944
 945         target = ipt_get_target(entry);
 946
 947         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 948                 struct xt_standard_target *t;
 949
 950                 t = (struct xt_standard_target *)target;
 951
 952                 switch (t->verdict) {
 953                 case XT_RETURN:
 954                         connman_info("\ttarget RETURN");
 955                         break;
 956
 957                 case -NF_ACCEPT - 1:
 958                         connman_info("\ttarget ACCEPT");
 959                         break;
 960
 961                 case -NF_DROP - 1:
 962                         connman_info("\ttarget DROP");
 963                         break;
 964
 965                 case -NF_QUEUE - 1:
 966                         connman_info("\ttarget QUEUE");
 967                         break;
 968
 969                 case -NF_STOP - 1:
 970                         connman_info("\ttarget STOP");
 971                         break;
 972
 973                 default:
 974                         connman_info("\tJUMP @%p (0x%x)",
 975                                 (char*)table->blob_entries->entrytable +
 976                                 t->verdict, t->verdict);
 977                         break;
 978                 }
 979
 980                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 981                                                 XTF_LOAD_MUST_SUCCEED);
 982
 983                 if(xt_t->print != NULL)
 984                         xt_t->print(NULL, target, 1);
 985         } else {
 986                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 987                 if (xt_t == NULL) {
 988                         connman_info("\ttarget %s", target->u.user.name);
 989                         return;
 990                 }
 991
 992                 if(xt_t->print != NULL) {
 993                         connman_info("\ttarget ");
 994                         xt_t->print(NULL, target, 1);
 995                 }
 996         }
 997 }
 998
 999 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
1000 {
1001         struct xtables_match *xt_m;
1002         struct xt_entry_match *match;
1003
1004         if (entry->elems == (unsigned char *)entry + entry->target_offset)
1005                 return;
1006
1007         match = (struct xt_entry_match *) entry->elems;
1008
1009         if (!strlen(match->u.user.name))
1010                 return;
1011
1012         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
1013         if (xt_m == NULL)
1014                 goto out;
1015
1016         if(xt_m->print != NULL) {
1017                 connman_info("\tmatch ");
1018                 xt_m->print(NULL, match, 1);
1019
1020                 return;
1021         }
1022
1023 out:
1024         connman_info("\tmatch %s", match->u.user.name);
1025
1026 }
1027
1028 static int dump_entry(struct ipt_entry *entry,
1029                                 struct connman_iptables *table)
1030 {
1031         struct xt_entry_target *target;
1032         unsigned int offset;
1033         int builtin;
1034
1035         offset = (char *)entry - (char *)table->blob_entries->entrytable;
1036         target = ipt_get_target(entry);
1037         builtin = is_hook_entry(table, entry);
1038
1039         if (entry_to_offset(table, entry) + entry->next_offset ==
1040                                         table->blob_entries->size) {
1041                 connman_info("End of CHAIN 0x%x", offset);
1042                 return 0;
1043         }
1044
1045         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
1046                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
1047                         target->data, entry, entry->elems,
1048                         (char *)entry + entry->target_offset,
1049                                 entry->next_offset);
1050
1051                 return 0;
1052         } else if (builtin >= 0) {
1053                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
1054                         hooknames[builtin], entry, entry->elems,
1055                         (char *)entry + entry->target_offset,
1056                                 entry->next_offset);
1057         } else {
1058                 connman_info("RULE %p  match %p  target %p  size %d", entry,
1059                         entry->elems,
1060                         (char *)entry + entry->target_offset,
1061                                 entry->next_offset);
1062         }
1063
1064         dump_match(table, entry);
1065         dump_target(table, entry);
1066         dump_ip(entry);
1067
1068         return 0;
1069 }
1070
1071 static void iptables_dump(struct connman_iptables *table)
1072 {
1073         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
1074                         table->info->name,
1075                         table->info->valid_hooks, table->info->num_entries,
1076                                 table->info->size);
1077
1078         ENTRY_ITERATE(table->blob_entries->entrytable,
1079                         table->blob_entries->size,
1080                         dump_entry, table);
1081
1082 }
1083
1084 static int iptables_get_entries(struct connman_iptables *table)
1085 {
1086         socklen_t entry_size;
1087
1088         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
1089
1090         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
1091                                 table->blob_entries, &entry_size);
1092 }
1093
1094 static int iptables_replace(struct connman_iptables *table,
1095                                         struct ipt_replace *r)
1096 {
1097         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
1098                          sizeof(*r) + r->size);
1099 }
1100
1101 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
1102 {
1103         struct ipt_entry *new_entry;
1104         int builtin;
1105
1106         new_entry = g_try_malloc0(entry->next_offset);
1107         if (new_entry == NULL)
1108                 return -ENOMEM;
1109
1110         memcpy(new_entry, entry, entry->next_offset);
1111
1112         builtin = is_hook_entry(table, entry);
1113
1114         return iptables_add_entry(table, new_entry, NULL, builtin);
1115 }
1116
1117 static void table_cleanup(struct connman_iptables *table)
1118 {
1119         GList *list;
1120         struct connman_iptables_entry *entry;
1121
1122         close(table->ipt_sock);
1123
1124         for (list = table->entries; list; list = list->next) {
1125                 entry = list->data;
1126
1127                 g_free(entry->entry);
1128                 g_free(entry);
1129         }
1130
1131         g_list_free(table->entries);
1132         g_free(table->info);
1133         g_free(table->blob_entries);
1134         g_free(table);
1135 }
1136
1137 static struct connman_iptables *iptables_init(char *table_name)
1138 {
1139         struct connman_iptables *table = NULL;
1140         char *module = NULL;
1141         socklen_t s;
1142
1143         DBG("%s", table_name);
1144
1145         if (xtables_insmod("ip_tables", NULL, TRUE) != 0)
1146                 goto err;
1147
1148         module = g_strconcat("iptable_", table_name, NULL);
1149         if (module == NULL)
1150                 goto err;
1151
1152         if (xtables_insmod(module, NULL, TRUE) != 0)
1153                 goto err;
1154
1155         g_free(module);
1156         module = NULL;
1157
1158         table = g_hash_table_lookup(table_hash, table_name);
1159         if (table != NULL)
1160                 return table;
1161
1162         table = g_try_new0(struct connman_iptables, 1);
1163         if (table == NULL)
1164                 return NULL;
1165
1166         table->info = g_try_new0(struct ipt_getinfo, 1);
1167         if (table->info == NULL)
1168                 goto err;
1169
1170         table->ipt_sock = socket(AF_INET, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW);
1171         if (table->ipt_sock < 0)
1172                 goto err;
1173
1174         s = sizeof(*table->info);
1175         strcpy(table->info->name, table_name);
1176         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
1177                                                 table->info, &s) < 0)
1178                 goto err;
1179
1180         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
1181                                                 table->info->size);
1182         if (table->blob_entries == NULL)
1183                 goto err;
1184
1185         strcpy(table->blob_entries->name, table_name);
1186         table->blob_entries->size = table->info->size;
1187
1188         if (iptables_get_entries(table) < 0)
1189                 goto err;
1190
1191         table->num_entries = 0;
1192         table->old_entries = table->info->num_entries;
1193         table->size = 0;
1194
1195         memcpy(table->underflow, table->info->underflow,
1196                                 sizeof(table->info->underflow));
1197         memcpy(table->hook_entry, table->info->hook_entry,
1198                                 sizeof(table->info->hook_entry));
1199
1200         ENTRY_ITERATE(table->blob_entries->entrytable,
1201                         table->blob_entries->size,
1202                                 add_entry, table);
1203
1204         g_hash_table_insert(table_hash, g_strdup(table_name), table);
1205
1206         return table;
1207
1208 err:
1209         g_free(module);
1210
1211         table_cleanup(table);
1212
1213         return NULL;
1214 }
1215
1216 static struct xtables_target *prepare_target(struct connman_iptables *table,
1217                                                         char *target_name)
1218 {
1219         struct xtables_target *xt_t = NULL;
1220         gboolean is_builtin, is_user_defined;
1221         GList *chain_head = NULL;
1222         size_t target_size;
1223
1224         is_builtin = FALSE;
1225         is_user_defined = FALSE;
1226
1227         if (is_builtin_target(target_name))
1228                 is_builtin = TRUE;
1229         else {
1230                 chain_head = find_chain_head(table, target_name);
1231                 if (chain_head != NULL && chain_head->next != NULL)
1232                         is_user_defined = TRUE;
1233         }
1234
1235         if (is_builtin || is_user_defined)
1236                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1237                                                 XTF_LOAD_MUST_SUCCEED);
1238         else
1239                 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1240
1241         if (xt_t == NULL)
1242                 return NULL;
1243
1244         target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1245
1246         xt_t->t = g_try_malloc0(target_size);
1247         if (xt_t->t == NULL)
1248                 return NULL;
1249
1250         xt_t->t->u.target_size = target_size;
1251
1252         if (is_builtin || is_user_defined) {
1253                 struct xt_standard_target *target;
1254
1255                 target = (struct xt_standard_target *)(xt_t->t);
1256                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
1257
1258                 if (is_builtin == TRUE)
1259                         target->verdict = target_to_verdict(target_name);
1260                 else if (is_user_defined == TRUE) {
1261                         struct connman_iptables_entry *target_rule;
1262
1263                         if (chain_head == NULL) {
1264                                 g_free(xt_t->t);
1265                                 return NULL;
1266                         }
1267
1268                         target_rule = chain_head->next->data;
1269                         target->verdict = target_rule->offset;
1270                 }
1271         } else {
1272                 strcpy(xt_t->t->u.user.name, target_name);
1273                 xt_t->t->u.user.revision = xt_t->revision;
1274                 if (xt_t->init != NULL)
1275                         xt_t->init(xt_t->t);
1276         }
1277
1278         return xt_t;
1279 }
1280
1281 static struct option iptables_opts[] = {
1282         {.name = "append",        .has_arg = 1, .val = 'A'},
1283         {.name = "delete",        .has_arg = 1, .val = 'D'},
1284         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
1285         {.name = "insert",        .has_arg = 1, .val = 'I'},
1286         {.name = "list",          .has_arg = 2, .val = 'L'},
1287         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
1288         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
1289         {.name = "destination",   .has_arg = 1, .val = 'd'},
1290         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
1291         {.name = "jump",          .has_arg = 1, .val = 'j'},
1292         {.name = "match",         .has_arg = 1, .val = 'm'},
1293         {.name = "out-interface", .has_arg = 1, .val = 'o'},
1294         {.name = "source",        .has_arg = 1, .val = 's'},
1295         {.name = "table",         .has_arg = 1, .val = 't'},
1296         {NULL},
1297 };
1298
1299 struct xtables_globals iptables_globals = {
1300         .option_offset = 0,
1301         .opts = iptables_opts,
1302         .orig_opts = iptables_opts,
1303 };
1304
1305 static int iptables_command(int argc, char *argv[])
1306 {
1307         struct connman_iptables *table;
1308         struct xtables_match *xt_m;
1309         struct xtables_target *xt_t;
1310         struct ipt_ip ip;
1311         char *table_name, *chain, *new_chain, *match_name, *target_name;
1312         char *flush_chain, *delete_chain;
1313         int c, ret, in_len, out_len;
1314         size_t size;
1315         gboolean dump, invert, insert, delete;
1316         struct in_addr src, dst;
1317
1318         if (argc == 0)
1319                 return -EINVAL;
1320
1321         dump = FALSE;
1322         invert = FALSE;
1323         insert = FALSE;
1324         delete = FALSE;
1325         table_name = chain = new_chain = match_name = target_name = NULL;
1326         flush_chain = delete_chain = NULL;
1327         memset(&ip, 0, sizeof(struct ipt_ip));
1328         table = NULL;
1329         xt_m = NULL;
1330         xt_t = NULL;
1331         ret = 0;
1332
1333         optind = 0;
1334
1335         while ((c = getopt_long(argc, argv, "-A:F:I:L::N:X:d:j:i:m:o:s:t:",
1336                                         iptables_globals.opts, NULL)) != -1) {
1337                 switch (c) {
1338                 case 'A':
1339                         /* It is either -A, -D or -I at once */
1340                         if (chain)
1341                                 goto out;
1342
1343                         chain = optarg;
1344                         break;
1345
1346                 case 'D':
1347                         /* It is either -A, -D or -I at once */
1348                         if (chain)
1349                                 goto out;
1350
1351                         chain = optarg;
1352                         delete = TRUE;
1353                         break;
1354
1355                 case 'F':
1356                         flush_chain = optarg;
1357                         break;
1358
1359                 case 'I':
1360                         /* It is either -A, -D or -I at once */
1361                         if (chain)
1362                                 goto out;
1363
1364                         chain = optarg;
1365                         insert = TRUE;
1366                         break;
1367
1368                 case 'L':
1369                         dump = TRUE;
1370                         break;
1371
1372                 case 'N':
1373                         new_chain = optarg;
1374                         break;
1375
1376                 case 'X':
1377                         delete_chain = optarg;
1378                         break;
1379
1380                 case 'd':
1381                         if (!inet_pton(AF_INET, optarg, &dst))
1382                                 break;
1383
1384                         ip.dst = dst;
1385                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1386
1387                         if (invert)
1388                                 ip.invflags |= IPT_INV_DSTIP;
1389
1390                         break;
1391
1392                 case 'i':
1393                         in_len = strlen(optarg);
1394
1395                         if (in_len + 1 > IFNAMSIZ)
1396                                 break;
1397
1398                         strcpy(ip.iniface, optarg);
1399                         memset(ip.iniface_mask, 0xff, in_len + 1);
1400
1401                         if (invert)
1402                                 ip.invflags |= IPT_INV_VIA_IN;
1403
1404                         break;
1405
1406                 case 'j':
1407                         target_name = optarg;
1408                         break;
1409
1410                 case 'm':
1411                         match_name = optarg;
1412
1413                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1414                         size = ALIGN(sizeof(struct ipt_entry_match)) +
1415                                                                 xt_m->size;
1416                         xt_m->m = g_try_malloc0(size);
1417                         if (xt_m == NULL)
1418                                 goto out;
1419                         xt_m->m->u.match_size = size;
1420                         strcpy(xt_m->m->u.user.name, xt_m->name);
1421                         xt_m->m->u.user.revision = xt_m->revision;
1422                         if (xt_m->init != NULL)
1423                                 xt_m->init(xt_m->m);
1424                         if (xt_m != xt_m->next) {
1425                                 iptables_globals.opts =
1426                                 xtables_merge_options(
1427 #if XTABLES_VERSION_CODE > 5
1428                                                 iptables_globals.orig_opts,
1429 #endif
1430                                                 iptables_globals.opts,
1431                                                 xt_m->extra_opts,
1432                                                 &xt_m->option_offset);
1433                                 if (iptables_globals.opts == NULL)
1434                                         goto out;
1435                         }
1436
1437                         break;
1438
1439                 case 'o':
1440                         out_len = strlen(optarg);
1441
1442                         if (out_len + 1 > IFNAMSIZ)
1443                                 break;
1444
1445                         strcpy(ip.outiface, optarg);
1446                         memset(ip.outiface_mask, 0xff, out_len + 1);
1447
1448                         if (invert)
1449                                 ip.invflags |= IPT_INV_VIA_OUT;
1450
1451                         break;
1452
1453                 case 's':
1454                         if (!inet_pton(AF_INET, optarg, &src))
1455                                 break;
1456
1457                         ip.src = src;
1458                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1459
1460                         if (invert)
1461                                 ip.invflags |= IPT_INV_SRCIP;
1462
1463                         break;
1464
1465                 case 't':
1466                         table_name = optarg;
1467                         break;
1468
1469                 case 1:
1470                         if (optarg[0] == '!' && optarg[1] == '\0') {
1471                                 invert = TRUE;
1472                                 optarg[0] = '\0';
1473                                 continue;
1474                         }
1475
1476                         connman_error("Invalid option");
1477
1478                         ret = -EINVAL;
1479                         goto out;
1480
1481                 default:
1482                         if (xt_t == NULL || xt_t->parse == NULL ||
1483                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1484                                         &xt_t->tflags, NULL, &xt_t->t)) {
1485                                 if (xt_m == NULL || xt_m->parse == NULL)
1486                                         break;
1487
1488                                 xt_m->parse(c - xt_m->option_offset, argv,
1489                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1490                         }
1491
1492                         break;
1493                 }
1494
1495                 invert = FALSE;
1496         }
1497
1498         if (table_name == NULL)
1499                 table_name = "filter";
1500
1501         table = iptables_init(table_name);
1502         if (table == NULL) {
1503                 ret = -EINVAL;
1504                 goto out;
1505         }
1506
1507         if (delete_chain != NULL) {
1508                 printf("Delete chain %s\n", delete_chain);
1509
1510                 iptables_delete_chain(table, delete_chain);
1511
1512                 goto out;
1513         }
1514
1515         if (dump) {
1516                 iptables_dump(table);
1517
1518                 ret = 0;
1519                 goto out;
1520         }
1521
1522         if (flush_chain) {
1523                 DBG("Flush chain %s", flush_chain);
1524
1525                 iptables_flush_chain(table, flush_chain);
1526
1527                 goto out;
1528         }
1529
1530         if (chain && new_chain) {
1531                 ret = -EINVAL;
1532                 goto out;
1533         }
1534
1535         if (new_chain) {
1536                 DBG("New chain %s", new_chain);
1537
1538                 ret = iptables_add_chain(table, new_chain);
1539                 goto out;
1540         }
1541
1542         if (chain) {
1543                 xt_t = prepare_target(table, target_name);
1544                 if (xt_t == NULL)
1545                         goto out;
1546
1547                 iptables_globals.opts =
1548                         xtables_merge_options(
1549 #if XTABLES_VERSION_CODE > 5
1550                                         iptables_globals.orig_opts,
1551 #endif
1552                                         iptables_globals.opts,
1553                                         xt_t->extra_opts,
1554                                         &xt_t->option_offset);
1555                 if (iptables_globals.opts == NULL)
1556                         goto out;
1557
1558                 if (delete == TRUE) {
1559                         DBG("Deleting %s to %s (match %s)\n",
1560                                         target_name, chain, match_name);
1561
1562                         ret = iptables_delete_rule(table, &ip, chain,
1563                                         target_name, xt_t, match_name, xt_m);
1564
1565                         goto out;
1566                 }
1567
1568                 if (insert == TRUE) {
1569                         DBG("Inserting %s to %s (match %s)",
1570                                         target_name, chain, match_name);
1571
1572                         ret = iptables_insert_rule(table, &ip, chain,
1573                                         target_name, xt_t, match_name, xt_m);
1574
1575                         goto out;
1576                 } else {
1577                         DBG("Adding %s to %s (match %s)",
1578                                         target_name, chain, match_name);
1579
1580                         ret = iptables_append_rule(table, &ip, chain,
1581                                         target_name, xt_t, match_name, xt_m);
1582
1583                         goto out;
1584                 }
1585         }
1586
1587 out:
1588         if (xt_t)
1589                 g_free(xt_t->t);
1590
1591         if (xt_m)
1592                 g_free(xt_m->m);
1593
1594         return ret;
1595 }
1596
1597 int __connman_iptables_command(const char *format, ...)
1598 {
1599         char **argv, **arguments, *command;
1600         int argc, i, ret;
1601         va_list args;
1602
1603         if (format == NULL)
1604                 return -EINVAL;
1605
1606         va_start(args, format);
1607
1608         command = g_strdup_vprintf(format, args);
1609
1610         va_end(args);
1611
1612         if (command == NULL)
1613                 return -ENOMEM;
1614
1615         arguments = g_strsplit_set(command, " ", -1);
1616
1617         for (argc = 0; arguments[argc]; argc++);
1618         ++argc;
1619
1620         DBG("command %s argc %d", command, argc);
1621
1622         argv = g_try_malloc0(argc * sizeof(char *));
1623         if (argv == NULL) {
1624                 g_free(command);
1625                 g_strfreev(arguments);
1626                 return -ENOMEM;
1627         }
1628
1629         argv[0] = "iptables";
1630         for (i = 1; i < argc; i++)
1631                 argv[i] = arguments[i - 1];
1632
1633         ret = iptables_command(argc, argv);
1634
1635         g_free(command);
1636         g_strfreev(arguments);
1637         g_free(argv);
1638
1639         return ret;
1640 }
1641
1642
1643 int __connman_iptables_commit(const char *table_name)
1644 {
1645         struct connman_iptables *table;
1646         struct ipt_replace *repl;
1647         int err;
1648
1649         DBG("%s", table_name);
1650
1651         table = g_hash_table_lookup(table_hash, table_name);
1652         if (table == NULL)
1653                 return -EINVAL;
1654
1655         repl = iptables_blob(table);
1656
1657         err = iptables_replace(table, repl);
1658
1659         g_free(repl->counters);
1660         g_free(repl);
1661
1662         if (err < 0)
1663             return err;
1664
1665         g_hash_table_remove(table_hash, table_name);
1666
1667         return 0;
1668 }
1669
1670 static void remove_table(gpointer user_data)
1671 {
1672         struct connman_iptables *table = user_data;
1673
1674         table_cleanup(table);
1675 }
1676
1677 int __connman_iptables_init(void)
1678 {
1679         DBG("");
1680
1681         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1682                                                 g_free, remove_table);
1683
1684         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1685
1686         return 0;
1687
1688 }
1689
1690 void __connman_iptables_cleanup(void)
1691 {
1692         DBG("");
1693
1694         g_hash_table_destroy(table_hash);
1695
1696         xtables_free_opts(1);
1697 }