src/iptables.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2010  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 *
 538 new_rule(struct ipt_ip *ip, char *target_name,
 539                 struct xtables_target *xt_t,
 540                 char *match_name, struct xtables_match *xt_m)
 541 {
 542         struct ipt_entry *new_entry;
 543         size_t match_size, target_size;
 544
 545         if (xt_m)
 546                 match_size = xt_m->m->u.match_size;
 547         else
 548                 match_size = 0;
 549
 550         if (xt_t)
 551                 target_size = ALIGN(xt_t->t->u.target_size);
 552         else
 553                 target_size = ALIGN(sizeof(struct xt_standard_target));
 554
 555         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 556                                                                 match_size);
 557         if (new_entry == NULL)
 558                 return NULL;
 559
 560         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 561
 562         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 563         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 564                                                                 match_size;
 565         if (xt_m) {
 566                 struct xt_entry_match *entry_match;
 567
 568                 entry_match = (struct xt_entry_match *)new_entry->elems;
 569                 memcpy(entry_match, xt_m->m, match_size);
 570         }
 571
 572         if (xt_t) {
 573                 struct xt_entry_target *entry_target;
 574
 575                 entry_target = ipt_get_target(new_entry);
 576                 memcpy(entry_target, xt_t->t, target_size);
 577         }
 578
 579         return new_entry;
 580 }
 581
 582 static void update_hooks(struct connman_iptables *table, GList *chain_head,
 583                                 struct ipt_entry *entry)
 584 {
 585         GList *list;
 586         struct connman_iptables_entry *head, *e;
 587         int builtin;
 588
 589         if (chain_head == NULL)
 590                 return;
 591
 592         head = chain_head->data;
 593
 594         builtin = head->builtin;
 595         if (builtin < 0)
 596                 return;
 597
 598         table->underflow[builtin] += entry->next_offset;
 599
 600         for (list = chain_head->next; list; list = list->next) {
 601                 e = list->data;
 602
 603                 builtin = e->builtin;
 604                 if (builtin < 0)
 605                         continue;
 606
 607                 table->hook_entry[builtin] += entry->next_offset;
 608                 table->underflow[builtin] += entry->next_offset;
 609         }
 610 }
 611
 612 static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
 613                                 struct ipt_ip *ip, char *chain_name,
 614                                 char *target_name, struct xtables_target *xt_t,
 615                                 char *match_name, struct xtables_match *xt_m,
 616                                 int *builtin)
 617 {
 618         GList *chain_tail, *chain_head;
 619         struct ipt_entry *new_entry;
 620         struct connman_iptables_entry *head;
 621
 622         chain_head = find_chain_head(table, chain_name);
 623         if (chain_head == NULL)
 624                 return NULL;
 625
 626         chain_tail = find_chain_tail(table, chain_name);
 627         if (chain_tail == NULL)
 628                 return NULL;
 629
 630         new_entry = new_rule(ip, target_name, xt_t, match_name, xt_m);
 631         if (new_entry == NULL)
 632                 return NULL;
 633
 634         update_hooks(table, chain_head, new_entry);
 635
 636         /*
 637          * If the chain is builtin, and does not have any rule,
 638          * then the one that we're inserting is becoming the head
 639          * and thus needs the builtin flag.
 640          */
 641         head = chain_head->data;
 642         if (head->builtin < 0)
 643                 *builtin = -1;
 644         else if (chain_head == chain_tail->prev) {
 645                 *builtin = head->builtin;
 646                 head->builtin = -1;
 647         }
 648
 649         return new_entry;
 650 }
 651
 652 static int iptables_append_rule(struct connman_iptables *table,
 653                                 struct ipt_ip *ip, char *chain_name,
 654                                 char *target_name, struct xtables_target *xt_t,
 655                                 char *match_name, struct xtables_match *xt_m)
 656 {
 657         GList *chain_tail;
 658         struct ipt_entry *new_entry;
 659         int builtin = -1, ret;
 660
 661         DBG("");
 662
 663         chain_tail = find_chain_tail(table, chain_name);
 664         if (chain_tail == NULL)
 665                 return -EINVAL;
 666
 667         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 668                         target_name, xt_t, match_name, xt_m, &builtin);
 669         if (new_entry == NULL)
 670                 return -EINVAL;
 671
 672         ret = iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
 673         if (ret < 0)
 674                 g_free(new_entry);
 675
 676         return ret;
 677 }
 678
 679 static int iptables_insert_rule(struct connman_iptables *table,
 680                                 struct ipt_ip *ip, char *chain_name,
 681                                 char *target_name, struct xtables_target *xt_t,
 682                                 char *match_name, struct xtables_match *xt_m)
 683 {
 684         struct ipt_entry *new_entry;
 685         int builtin = -1, ret;
 686         GList *chain_head;
 687
 688         chain_head = find_chain_head(table, chain_name);
 689         if (chain_head == NULL)
 690                 return -EINVAL;
 691
 692         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 693                         target_name, xt_t, match_name, xt_m, &builtin);
 694         if (new_entry == NULL)
 695                 return -EINVAL;
 696
 697         ret = iptables_add_entry(table, new_entry, chain_head->next, builtin);
 698         if (ret < 0)
 699                 g_free(new_entry);
 700
 701         return ret;
 702 }
 703
 704 static gboolean is_same_ipt_entry(struct ipt_entry *i_e1,
 705                                         struct ipt_entry *i_e2)
 706 {
 707         if (memcmp(&i_e1->ip, &i_e2->ip, sizeof(struct ipt_ip)) != 0)
 708                 return FALSE;
 709
 710         if (i_e1->target_offset != i_e2->target_offset)
 711                 return FALSE;
 712
 713         if (i_e1->next_offset != i_e2->next_offset)
 714                 return FALSE;
 715
 716         return TRUE;
 717 }
 718
 719 static gboolean is_same_target(struct xt_entry_target *xt_e_t1,
 720                                         struct xt_entry_target *xt_e_t2)
 721 {
 722         if (xt_e_t1 == NULL || xt_e_t2 == NULL)
 723                 return FALSE;
 724
 725         if (strcmp(xt_e_t1->u.user.name, IPT_STANDARD_TARGET) == 0) {
 726                 struct xt_standard_target *xt_s_t1;
 727                 struct xt_standard_target *xt_s_t2;
 728
 729                 xt_s_t1 = (struct xt_standard_target *) xt_e_t1;
 730                 xt_s_t2 = (struct xt_standard_target *) xt_e_t2;
 731
 732                 if (xt_s_t1->verdict != xt_s_t2->verdict)
 733                         return FALSE;
 734         } else {
 735                 if (xt_e_t1->u.target_size != xt_e_t2->u.target_size)
 736                         return FALSE;
 737
 738                 if (strcmp(xt_e_t1->u.user.name, xt_e_t2->u.user.name) != 0)
 739                         return FALSE;
 740         }
 741
 742         return TRUE;
 743 }
 744
 745 static gboolean is_same_match(struct xt_entry_match *xt_e_m1,
 746                                 struct xt_entry_match *xt_e_m2)
 747 {
 748         if (xt_e_m1 == NULL || xt_e_m2 == NULL)
 749                 return FALSE;
 750
 751         if (xt_e_m1->u.match_size != xt_e_m2->u.match_size)
 752                 return FALSE;
 753
 754         if (xt_e_m1->u.user.revision != xt_e_m2->u.user.revision)
 755                 return FALSE;
 756
 757         if (strcmp(xt_e_m1->u.user.name, xt_e_m2->u.user.name) != 0)
 758                 return FALSE;
 759
 760         return TRUE;
 761 }
 762
 763 static int iptables_delete_rule(struct connman_iptables *table,
 764                                 struct ipt_ip *ip, char *chain_name,
 765                                 char *target_name, struct xtables_target *xt_t,
 766                                 char *match_name, struct xtables_match *xt_m)
 767 {
 768         GList *chain_tail, *chain_head, *list;
 769         struct xt_entry_target *xt_e_t = NULL;
 770         struct xt_entry_match *xt_e_m = NULL;
 771         struct connman_iptables_entry *entry;
 772         struct ipt_entry *entry_test;
 773         int builtin, removed;
 774
 775         removed = 0;
 776
 777         chain_head = find_chain_head(table, chain_name);
 778         if (chain_head == NULL)
 779                 return -EINVAL;
 780
 781         chain_tail = find_chain_tail(table, chain_name);
 782         if (chain_tail == NULL)
 783                 return -EINVAL;
 784
 785         if (!xt_t && !xt_m)
 786                 return -EINVAL;
 787
 788         entry_test = new_rule(ip, target_name, xt_t, match_name, xt_m);
 789         if (entry_test == NULL)
 790                 return -EINVAL;
 791
 792         if (xt_t != NULL)
 793                 xt_e_t = ipt_get_target(entry_test);
 794         if (xt_m != NULL)
 795                 xt_e_m = (struct xt_entry_match *)entry_test->elems;
 796
 797         entry = chain_head->data;
 798         builtin = entry->builtin;
 799
 800         if (builtin >= 0)
 801                 list = chain_head;
 802         else
 803                 list = chain_head->next;
 804
 805         for (entry = NULL; list != chain_tail->prev; list = list->next) {
 806                 struct connman_iptables_entry *tmp;
 807                 struct ipt_entry *tmp_e;
 808
 809                 tmp = list->data;
 810                 tmp_e = tmp->entry;
 811
 812                 if (is_same_ipt_entry(entry_test, tmp_e) == FALSE)
 813                         continue;
 814
 815                 if (xt_t != NULL) {
 816                         struct xt_entry_target *tmp_xt_e_t;
 817
 818                         tmp_xt_e_t = ipt_get_target(tmp_e);
 819
 820                         if (!is_same_target(tmp_xt_e_t, xt_e_t))
 821                                 continue;
 822                 }
 823
 824                 if (xt_m != NULL) {
 825                         struct xt_entry_match *tmp_xt_e_m;
 826
 827                         tmp_xt_e_m = (struct xt_entry_match *)tmp_e->elems;
 828
 829                         if (!is_same_match(tmp_xt_e_m, xt_e_m))
 830                                 continue;
 831                 }
 832
 833                 entry = tmp;
 834                 break;
 835         }
 836
 837         if (entry == NULL) {
 838                 g_free(entry_test);
 839                 return -EINVAL;
 840         }
 841
 842         /* We have deleted a rule,
 843          * all references should be bumped accordingly */
 844         if (list->next != NULL)
 845                 update_targets_reference(table, list->next->data,
 846                                                 list->data, TRUE);
 847
 848         removed += remove_table_entry(table, entry);
 849
 850         if (builtin >= 0) {
 851                 list = list->next;
 852                 if (list) {
 853                         entry = list->data;
 854                         entry->builtin = builtin;
 855                 }
 856
 857                 table->underflow[builtin] -= removed;
 858                 for (list = chain_tail; list; list = list->next) {
 859                         entry = list->data;
 860
 861                         builtin = entry->builtin;
 862                         if (builtin < 0)
 863                                 continue;
 864
 865                         table->hook_entry[builtin] -= removed;
 866                         table->underflow[builtin] -= removed;
 867                 }
 868         }
 869
 870         update_offsets(table);
 871
 872         return 0;
 873 }
 874
 875 static struct ipt_replace *
 876 iptables_blob(struct connman_iptables *table)
 877 {
 878         struct ipt_replace *r;
 879         GList *list;
 880         struct connman_iptables_entry *e;
 881         unsigned char *entry_index;
 882
 883         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 884         if (r == NULL)
 885                 return NULL;
 886
 887         memset(r, 0, sizeof(*r) + table->size);
 888
 889         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 890                                 * table->old_entries);
 891         if (r->counters == NULL) {
 892                 g_free(r);
 893                 return NULL;
 894         }
 895
 896         strcpy(r->name, table->info->name);
 897         r->num_entries = table->num_entries;
 898         r->size = table->size;
 899
 900         r->num_counters = table->old_entries;
 901         r->valid_hooks  = table->info->valid_hooks;
 902
 903         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 904         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 905
 906         entry_index = (unsigned char *)r->entries;
 907         for (list = table->entries; list; list = list->next) {
 908                 e = list->data;
 909
 910                 memcpy(entry_index, e->entry, e->entry->next_offset);
 911                 entry_index += e->entry->next_offset;
 912         }
 913
 914         return r;
 915 }
 916
 917 static void dump_ip(struct ipt_entry *entry)
 918 {
 919         struct ipt_ip *ip = &entry->ip;
 920         char ip_string[INET6_ADDRSTRLEN];
 921         char ip_mask[INET6_ADDRSTRLEN];
 922
 923         if (strlen(ip->iniface))
 924                 connman_info("\tin %s", ip->iniface);
 925
 926         if (strlen(ip->outiface))
 927                 connman_info("\tout %s", ip->outiface);
 928
 929         if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
 930                         inet_ntop(AF_INET, &ip->smsk,
 931                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 932                 connman_info("\tsrc %s/%s", ip_string, ip_mask);
 933
 934         if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
 935                         inet_ntop(AF_INET, &ip->dmsk,
 936                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 937                 connman_info("\tdst %s/%s", ip_string, ip_mask);
 938 }
 939
 940 static void dump_target(struct connman_iptables *table,
 941                                 struct ipt_entry *entry)
 942
 943 {
 944         struct xtables_target *xt_t;
 945         struct xt_entry_target *target;
 946
 947         target = ipt_get_target(entry);
 948
 949         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 950                 struct xt_standard_target *t;
 951
 952                 t = (struct xt_standard_target *)target;
 953
 954                 switch (t->verdict) {
 955                 case XT_RETURN:
 956                         connman_info("\ttarget RETURN");
 957                         break;
 958
 959                 case -NF_ACCEPT - 1:
 960                         connman_info("\ttarget ACCEPT");
 961                         break;
 962
 963                 case -NF_DROP - 1:
 964                         connman_info("\ttarget DROP");
 965                         break;
 966
 967                 case -NF_QUEUE - 1:
 968                         connman_info("\ttarget QUEUE");
 969                         break;
 970
 971                 case -NF_STOP - 1:
 972                         connman_info("\ttarget STOP");
 973                         break;
 974
 975                 default:
 976                         connman_info("\tJUMP @%p (0x%x)",
 977                                 (char*)table->blob_entries->entrytable +
 978                                 t->verdict, t->verdict);
 979                         break;
 980                 }
 981
 982                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 983                                                 XTF_LOAD_MUST_SUCCEED);
 984
 985                 if(xt_t->print != NULL)
 986                         xt_t->print(NULL, target, 1);
 987         } else {
 988                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 989                 if (xt_t == NULL) {
 990                         connman_info("\ttarget %s", target->u.user.name);
 991                         return;
 992                 }
 993
 994                 if(xt_t->print != NULL) {
 995                         connman_info("\ttarget ");
 996                         xt_t->print(NULL, target, 1);
 997                 }
 998         }
 999 }
1000
1001 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
1002 {
1003         struct xtables_match *xt_m;
1004         struct xt_entry_match *match;
1005
1006         if (entry->elems == (unsigned char *)entry + entry->target_offset)
1007                 return;
1008
1009         match = (struct xt_entry_match *) entry->elems;
1010
1011         if (!strlen(match->u.user.name))
1012                 return;
1013
1014         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
1015         if (xt_m == NULL)
1016                 goto out;
1017
1018         if(xt_m->print != NULL) {
1019                 connman_info("\tmatch ");
1020                 xt_m->print(NULL, match, 1);
1021
1022                 return;
1023         }
1024
1025 out:
1026         connman_info("\tmatch %s", match->u.user.name);
1027
1028 }
1029
1030 static int dump_entry(struct ipt_entry *entry,
1031                                 struct connman_iptables *table)
1032 {
1033         struct xt_entry_target *target;
1034         unsigned int offset;
1035         int builtin;
1036
1037         offset = (char *)entry - (char *)table->blob_entries->entrytable;
1038         target = ipt_get_target(entry);
1039         builtin = is_hook_entry(table, entry);
1040
1041         if (entry_to_offset(table, entry) + entry->next_offset ==
1042                                         table->blob_entries->size) {
1043                 connman_info("End of CHAIN 0x%x", offset);
1044                 return 0;
1045         }
1046
1047         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
1048                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
1049                         target->data, entry, entry->elems,
1050                         (char *)entry + entry->target_offset,
1051                                 entry->next_offset);
1052
1053                 return 0;
1054         } else if (builtin >= 0) {
1055                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
1056                         hooknames[builtin], entry, entry->elems,
1057                         (char *)entry + entry->target_offset,
1058                                 entry->next_offset);
1059         } else {
1060                 connman_info("RULE %p  match %p  target %p  size %d", entry,
1061                         entry->elems,
1062                         (char *)entry + entry->target_offset,
1063                                 entry->next_offset);
1064         }
1065
1066         dump_match(table, entry);
1067         dump_target(table, entry);
1068         dump_ip(entry);
1069
1070         return 0;
1071 }
1072
1073 static void iptables_dump(struct connman_iptables *table)
1074 {
1075         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
1076                         table->info->name,
1077                         table->info->valid_hooks, table->info->num_entries,
1078                                 table->info->size);
1079
1080         ENTRY_ITERATE(table->blob_entries->entrytable,
1081                         table->blob_entries->size,
1082                         dump_entry, table);
1083
1084 }
1085
1086 static int iptables_get_entries(struct connman_iptables *table)
1087 {
1088         socklen_t entry_size;
1089
1090         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
1091
1092         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
1093                                 table->blob_entries, &entry_size);
1094 }
1095
1096 static int iptables_replace(struct connman_iptables *table,
1097                                         struct ipt_replace *r)
1098 {
1099         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
1100                          sizeof(*r) + r->size);
1101 }
1102
1103 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
1104 {
1105         struct ipt_entry *new_entry;
1106         int builtin;
1107
1108         new_entry = g_try_malloc0(entry->next_offset);
1109         if (new_entry == NULL)
1110                 return -ENOMEM;
1111
1112         memcpy(new_entry, entry, entry->next_offset);
1113
1114         builtin = is_hook_entry(table, entry);
1115
1116         return iptables_add_entry(table, new_entry, NULL, builtin);
1117 }
1118
1119 static void table_cleanup(struct connman_iptables *table)
1120 {
1121         GList *list;
1122         struct connman_iptables_entry *entry;
1123
1124         close(table->ipt_sock);
1125
1126         for (list = table->entries; list; list = list->next) {
1127                 entry = list->data;
1128
1129                 g_free(entry->entry);
1130                 g_free(entry);
1131         }
1132
1133         g_list_free(table->entries);
1134         g_free(table->info);
1135         g_free(table->blob_entries);
1136         g_free(table);
1137 }
1138
1139 static struct connman_iptables *iptables_init(char *table_name)
1140 {
1141         struct connman_iptables *table = NULL;
1142         char *module = NULL;
1143         socklen_t s;
1144
1145         DBG("%s", table_name);
1146
1147         if (xtables_insmod("ip_tables", NULL, TRUE) != 0)
1148                 goto err;
1149
1150         module = g_strconcat("iptable_", table_name, NULL);
1151         if (module == NULL)
1152                 goto err;
1153
1154         if (xtables_insmod(module, NULL, TRUE) != 0)
1155                 goto err;
1156
1157         g_free(module);
1158         module = NULL;
1159
1160         table = g_hash_table_lookup(table_hash, table_name);
1161         if (table != NULL)
1162                 return table;
1163
1164         table = g_try_new0(struct connman_iptables, 1);
1165         if (table == NULL)
1166                 return NULL;
1167
1168         table->info = g_try_new0(struct ipt_getinfo, 1);
1169         if (table->info == NULL)
1170                 goto err;
1171
1172         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
1173         if (table->ipt_sock < 0)
1174                 goto err;
1175
1176         s = sizeof(*table->info);
1177         strcpy(table->info->name, table_name);
1178         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
1179                                                 table->info, &s) < 0)
1180                 goto err;
1181
1182         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
1183                                                 table->info->size);
1184         if (table->blob_entries == NULL)
1185                 goto err;
1186
1187         strcpy(table->blob_entries->name, table_name);
1188         table->blob_entries->size = table->info->size;
1189
1190         if (iptables_get_entries(table) < 0)
1191                 goto err;
1192
1193         table->num_entries = 0;
1194         table->old_entries = table->info->num_entries;
1195         table->size = 0;
1196
1197         memcpy(table->underflow, table->info->underflow,
1198                                 sizeof(table->info->underflow));
1199         memcpy(table->hook_entry, table->info->hook_entry,
1200                                 sizeof(table->info->hook_entry));
1201
1202         ENTRY_ITERATE(table->blob_entries->entrytable,
1203                         table->blob_entries->size,
1204                                 add_entry, table);
1205
1206         g_hash_table_insert(table_hash, g_strdup(table_name), table);
1207
1208         return table;
1209
1210 err:
1211         g_free(module);
1212
1213         table_cleanup(table);
1214
1215         return NULL;
1216 }
1217
1218 static struct xtables_target *prepare_target(struct connman_iptables *table,
1219                                                         char *target_name)
1220 {
1221         struct xtables_target *xt_t = NULL;
1222         gboolean is_builtin, is_user_defined;
1223         GList *chain_head = NULL;
1224         size_t target_size;
1225
1226         is_builtin = FALSE;
1227         is_user_defined = FALSE;
1228
1229         if (is_builtin_target(target_name))
1230                 is_builtin = TRUE;
1231         else {
1232                 chain_head = find_chain_head(table, target_name);
1233                 if (chain_head != NULL && chain_head->next != NULL)
1234                         is_user_defined = TRUE;
1235         }
1236
1237         if (is_builtin || is_user_defined)
1238                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1239                                                 XTF_LOAD_MUST_SUCCEED);
1240         else
1241                 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1242
1243         if (xt_t == NULL)
1244                 return NULL;
1245
1246         target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1247
1248         xt_t->t = g_try_malloc0(target_size);
1249         if (xt_t->t == NULL)
1250                 return NULL;
1251
1252         xt_t->t->u.target_size = target_size;
1253
1254         if (is_builtin || is_user_defined) {
1255                 struct xt_standard_target *target;
1256
1257                 target = (struct xt_standard_target *)(xt_t->t);
1258                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
1259
1260                 if (is_builtin == TRUE)
1261                         target->verdict = target_to_verdict(target_name);
1262                 else if (is_user_defined == TRUE) {
1263                         struct connman_iptables_entry *target_rule;
1264
1265                         if (chain_head == NULL) {
1266                                 g_free(xt_t->t);
1267                                 return NULL;
1268                         }
1269
1270                         target_rule = chain_head->next->data;
1271                         target->verdict = target_rule->offset;
1272                 }
1273         } else {
1274                 strcpy(xt_t->t->u.user.name, target_name);
1275                 xt_t->t->u.user.revision = xt_t->revision;
1276                 if (xt_t->init != NULL)
1277                         xt_t->init(xt_t->t);
1278         }
1279
1280         return xt_t;
1281 }
1282
1283 static struct option iptables_opts[] = {
1284         {.name = "append",        .has_arg = 1, .val = 'A'},
1285         {.name = "delete",        .has_arg = 1, .val = 'D'},
1286         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
1287         {.name = "insert",        .has_arg = 1, .val = 'I'},
1288         {.name = "list",          .has_arg = 2, .val = 'L'},
1289         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
1290         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
1291         {.name = "destination",   .has_arg = 1, .val = 'd'},
1292         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
1293         {.name = "jump",          .has_arg = 1, .val = 'j'},
1294         {.name = "match",         .has_arg = 1, .val = 'm'},
1295         {.name = "out-interface", .has_arg = 1, .val = 'o'},
1296         {.name = "source",        .has_arg = 1, .val = 's'},
1297         {.name = "table",         .has_arg = 1, .val = 't'},
1298         {NULL},
1299 };
1300
1301 struct xtables_globals iptables_globals = {
1302         .option_offset = 0,
1303         .opts = iptables_opts,
1304         .orig_opts = iptables_opts,
1305 };
1306
1307 static int iptables_command(int argc, char *argv[])
1308 {
1309         struct connman_iptables *table;
1310         struct xtables_match *xt_m;
1311         struct xtables_target *xt_t;
1312         struct ipt_ip ip;
1313         char *table_name, *chain, *new_chain, *match_name, *target_name;
1314         char *flush_chain, *delete_chain;
1315         int c, ret, in_len, out_len;
1316         size_t size;
1317         gboolean dump, invert, insert, delete;
1318         struct in_addr src, dst;
1319
1320         if (argc == 0)
1321                 return -EINVAL;
1322
1323         dump = FALSE;
1324         invert = FALSE;
1325         insert = FALSE;
1326         delete = FALSE;
1327         table_name = chain = new_chain = match_name = target_name = NULL;
1328         flush_chain = delete_chain = NULL;
1329         memset(&ip, 0, sizeof(struct ipt_ip));
1330         table = NULL;
1331         xt_m = NULL;
1332         xt_t = NULL;
1333         ret = 0;
1334
1335         optind = 0;
1336
1337         while ((c = getopt_long(argc, argv, "-A:F:I:L::N:X:d:j:i:m:o:s:t:",
1338                                         iptables_globals.opts, NULL)) != -1) {
1339                 switch (c) {
1340                 case 'A':
1341                         /* It is either -A, -D or -I at once */
1342                         if (chain)
1343                                 goto out;
1344
1345                         chain = optarg;
1346                         break;
1347
1348                 case 'D':
1349                         /* It is either -A, -D or -I at once */
1350                         if (chain)
1351                                 goto out;
1352
1353                         chain = optarg;
1354                         delete = TRUE;
1355                         break;
1356
1357                 case 'F':
1358                         flush_chain = optarg;
1359                         break;
1360
1361                 case 'I':
1362                         /* It is either -A, -D or -I at once */
1363                         if (chain)
1364                                 goto out;
1365
1366                         chain = optarg;
1367                         insert = TRUE;
1368                         break;
1369
1370                 case 'L':
1371                         dump = TRUE;
1372                         break;
1373
1374                 case 'N':
1375                         new_chain = optarg;
1376                         break;
1377
1378                 case 'X':
1379                         delete_chain = optarg;
1380                         break;
1381
1382                 case 'd':
1383                         if (!inet_pton(AF_INET, optarg, &dst))
1384                                 break;
1385
1386                         ip.dst = dst;
1387                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1388
1389                         if (invert)
1390                                 ip.invflags |= IPT_INV_DSTIP;
1391
1392                         break;
1393
1394                 case 'i':
1395                         in_len = strlen(optarg);
1396
1397                         if (in_len + 1 > IFNAMSIZ)
1398                                 break;
1399
1400                         strcpy(ip.iniface, optarg);
1401                         memset(ip.iniface_mask, 0xff, in_len + 1);
1402
1403                         if (invert)
1404                                 ip.invflags |= IPT_INV_VIA_IN;
1405
1406                         break;
1407
1408                 case 'j':
1409                         target_name = optarg;
1410                         break;
1411
1412                 case 'm':
1413                         match_name = optarg;
1414
1415                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1416                         size = ALIGN(sizeof(struct ipt_entry_match)) +
1417                                                                 xt_m->size;
1418                         xt_m->m = g_try_malloc0(size);
1419                         if (xt_m == NULL)
1420                                 goto out;
1421                         xt_m->m->u.match_size = size;
1422                         strcpy(xt_m->m->u.user.name, xt_m->name);
1423                         xt_m->m->u.user.revision = xt_m->revision;
1424                         if (xt_m->init != NULL)
1425                                 xt_m->init(xt_m->m);
1426                         if (xt_m != xt_m->next) {
1427                                 iptables_globals.opts =
1428                                 xtables_merge_options(
1429 #if XTABLES_VERSION_CODE > 5
1430                                                 iptables_globals.orig_opts,
1431 #endif
1432                                                 iptables_globals.opts,
1433                                                 xt_m->extra_opts,
1434                                                 &xt_m->option_offset);
1435                                 if (iptables_globals.opts == NULL)
1436                                         goto out;
1437                         }
1438
1439                         break;
1440
1441                 case 'o':
1442                         out_len = strlen(optarg);
1443
1444                         if (out_len + 1 > IFNAMSIZ)
1445                                 break;
1446
1447                         strcpy(ip.outiface, optarg);
1448                         memset(ip.outiface_mask, 0xff, out_len + 1);
1449
1450                         if (invert)
1451                                 ip.invflags |= IPT_INV_VIA_OUT;
1452
1453                         break;
1454
1455                 case 's':
1456                         if (!inet_pton(AF_INET, optarg, &src))
1457                                 break;
1458
1459                         ip.src = src;
1460                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1461
1462                         if (invert)
1463                                 ip.invflags |= IPT_INV_SRCIP;
1464
1465                         break;
1466
1467                 case 't':
1468                         table_name = optarg;
1469                         break;
1470
1471                 case 1:
1472                         if (optarg[0] == '!' && optarg[1] == '\0') {
1473                                 invert = TRUE;
1474                                 optarg[0] = '\0';
1475                                 continue;
1476                         }
1477
1478                         connman_error("Invalid option");
1479
1480                         ret = -EINVAL;
1481                         goto out;
1482
1483                 default:
1484                         if (xt_t == NULL || xt_t->parse == NULL ||
1485                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1486                                         &xt_t->tflags, NULL, &xt_t->t)) {
1487                                 if (xt_m == NULL || xt_m->parse == NULL)
1488                                         break;
1489
1490                                 xt_m->parse(c - xt_m->option_offset, argv,
1491                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1492                         }
1493
1494                         break;
1495                 }
1496
1497                 invert = FALSE;
1498         }
1499
1500         if (table_name == NULL)
1501                 table_name = "filter";
1502
1503         table = iptables_init(table_name);
1504         if (table == NULL) {
1505                 ret = -EINVAL;
1506                 goto out;
1507         }
1508
1509         if (delete_chain != NULL) {
1510                 printf("Delete chain %s\n", delete_chain);
1511
1512                 iptables_delete_chain(table, delete_chain);
1513
1514                 goto out;
1515         }
1516
1517         if (dump) {
1518                 iptables_dump(table);
1519
1520                 ret = 0;
1521                 goto out;
1522         }
1523
1524         if (flush_chain) {
1525                 DBG("Flush chain %s", flush_chain);
1526
1527                 iptables_flush_chain(table, flush_chain);
1528
1529                 goto out;
1530         }
1531
1532         if (chain && new_chain) {
1533                 ret = -EINVAL;
1534                 goto out;
1535         }
1536
1537         if (new_chain) {
1538                 DBG("New chain %s", new_chain);
1539
1540                 ret = iptables_add_chain(table, new_chain);
1541                 goto out;
1542         }
1543
1544         if (chain) {
1545                 xt_t = prepare_target(table, target_name);
1546                 if (xt_t == NULL)
1547                         goto out;
1548
1549                 iptables_globals.opts =
1550                         xtables_merge_options(
1551 #if XTABLES_VERSION_CODE > 5
1552                                         iptables_globals.orig_opts,
1553 #endif
1554                                         iptables_globals.opts,
1555                                         xt_t->extra_opts,
1556                                         &xt_t->option_offset);
1557                 if (iptables_globals.opts == NULL)
1558                         goto out;
1559
1560                 if (delete == TRUE) {
1561                         DBG("Deleting %s to %s (match %s)\n",
1562                                         target_name, chain, match_name);
1563
1564                         ret = iptables_delete_rule(table, &ip, chain,
1565                                         target_name, xt_t, match_name, xt_m);
1566
1567                         goto out;
1568                 }
1569
1570                 if (insert == TRUE) {
1571                         DBG("Inserting %s to %s (match %s)",
1572                                         target_name, chain, match_name);
1573
1574                         ret = iptables_insert_rule(table, &ip, chain,
1575                                         target_name, xt_t, match_name, xt_m);
1576
1577                         goto out;
1578                 } else {
1579                         DBG("Adding %s to %s (match %s)",
1580                                         target_name, chain, match_name);
1581
1582                         ret = iptables_append_rule(table, &ip, chain,
1583                                         target_name, xt_t, match_name, xt_m);
1584
1585                         goto out;
1586                 }
1587         }
1588
1589 out:
1590         if (xt_t)
1591                 g_free(xt_t->t);
1592
1593         if (xt_m)
1594                 g_free(xt_m->m);
1595
1596         return ret;
1597 }
1598
1599 int __connman_iptables_command(const char *format, ...)
1600 {
1601         char **argv, **arguments, *command;
1602         int argc, i, ret;
1603         va_list args;
1604
1605         if (format == NULL)
1606                 return -EINVAL;
1607
1608         va_start(args, format);
1609
1610         command = g_strdup_vprintf(format, args);
1611
1612         va_end(args);
1613
1614         if (command == NULL)
1615                 return -ENOMEM;
1616
1617         arguments = g_strsplit_set(command, " ", -1);
1618
1619         for (argc = 0; arguments[argc]; argc++);
1620         ++argc;
1621
1622         DBG("command %s argc %d", command, argc);
1623
1624         argv = g_try_malloc0(argc * sizeof(char *));
1625         if (argv == NULL) {
1626                 g_free(command);
1627                 g_strfreev(arguments);
1628                 return -ENOMEM;
1629         }
1630
1631         argv[0] = "iptables";
1632         for (i = 1; i < argc; i++)
1633                 argv[i] = arguments[i - 1];
1634
1635         ret = iptables_command(argc, argv);
1636
1637         g_free(command);
1638         g_strfreev(arguments);
1639         g_free(argv);
1640
1641         return ret;
1642 }
1643
1644
1645 int __connman_iptables_commit(const char *table_name)
1646 {
1647         struct connman_iptables *table;
1648         struct ipt_replace *repl;
1649         int err;
1650
1651         DBG("%s", table_name);
1652
1653         table = g_hash_table_lookup(table_hash, table_name);
1654         if (table == NULL)
1655                 return -EINVAL;
1656
1657         repl = iptables_blob(table);
1658
1659         err = iptables_replace(table, repl);
1660
1661         g_free(repl->counters);
1662         g_free(repl);
1663
1664         if (err < 0)
1665             return err;
1666
1667         g_hash_table_remove(table_hash, table_name);
1668
1669         return 0;
1670 }
1671
1672 static void remove_table(gpointer user_data)
1673 {
1674         struct connman_iptables *table = user_data;
1675
1676         table_cleanup(table);
1677 }
1678
1679 int __connman_iptables_init(void)
1680 {
1681         DBG("");
1682
1683         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1684                                                 g_free, remove_table);
1685
1686         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1687
1688         return 0;
1689
1690 }
1691
1692 void __connman_iptables_cleanup(void)
1693 {
1694         DBG("");
1695
1696         g_hash_table_destroy(table_hash);
1697
1698         xtables_free_opts(1);
1699 }