tools/iptables-test.c

   1 /*
   2  *  Connection Manager
   3  *
   4  *  Copyright (C) 2007-2012  Intel Corporation. All rights reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License version 2 as
   8  *  published by the Free Software Foundation.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  *
  19  */
  20
  21 #include <getopt.h>
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/errno.h>
  27 #include <sys/socket.h>
  28 #include <sys/types.h>
  29 #include <arpa/inet.h>
  30 #include <xtables.h>
  31
  32 #include <linux/netfilter_ipv4/ip_tables.h>
  33
  34 #include <glib.h>
  35
  36 static const char *hooknames[] = {
  37         [NF_IP_PRE_ROUTING]     = "PREROUTING",
  38         [NF_IP_LOCAL_IN]        = "INPUT",
  39         [NF_IP_FORWARD]         = "FORWARD",
  40         [NF_IP_LOCAL_OUT]       = "OUTPUT",
  41         [NF_IP_POST_ROUTING]    = "POSTROUTING",
  42 };
  43
  44 #define LABEL_ACCEPT  "ACCEPT"
  45 #define LABEL_DROP    "DROP"
  46 #define LABEL_QUEUE   "QUEUE"
  47 #define LABEL_RETURN  "RETURN"
  48
  49 #define XT_OPTION_OFFSET_SCALE 256
  50
  51 /* fn returns 0 to continue iteration */
  52 #define _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
  53 ({                                                              \
  54         unsigned int __i;                                       \
  55         int __n;                                                \
  56         int __ret = 0;                                          \
  57         type *__entry;                                          \
  58                                                                 \
  59         for (__i = 0, __n = 0; __i < (size);                    \
  60              __i += __entry->next_offset, __n++) {              \
  61                 __entry = (void *)(entries) + __i;              \
  62                 if (__n < n)                                    \
  63                         continue;                               \
  64                                                                 \
  65                 __ret = fn(__entry,  ## args);                  \
  66                 if (__ret != 0)                                 \
  67                         break;                                  \
  68         }                                                       \
  69         __ret;                                                  \
  70 })
  71
  72 /* fn returns 0 to continue iteration */
  73 #define _XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
  74         _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
  75
  76 #define ENTRY_ITERATE(entries, size, fn, args...) \
  77         _XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
  78
  79 #define MIN_ALIGN (__alignof__(struct ipt_entry))
  80
  81 #define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
  82
  83 struct error_target {
  84         struct xt_entry_target t;
  85         char error[IPT_TABLE_MAXNAMELEN];
  86 };
  87
  88 struct connman_iptables_entry {
  89         int offset;
  90         int builtin;
  91
  92         struct ipt_entry *entry;
  93 };
  94
  95 struct connman_iptables {
  96         int ipt_sock;
  97
  98         struct ipt_getinfo *info;
  99         struct ipt_get_entries *blob_entries;
 100
 101         unsigned int num_entries;
 102         unsigned int old_entries;
 103         unsigned int size;
 104
 105         unsigned int underflow[NF_INET_NUMHOOKS];
 106         unsigned int hook_entry[NF_INET_NUMHOOKS];
 107
 108         GList *entries;
 109 };
 110
 111
 112 static struct ipt_entry *get_entry(struct connman_iptables *table,
 113                                         unsigned int offset)
 114 {
 115         return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
 116                                                                         offset);
 117 }
 118
 119 static int is_hook_entry(struct connman_iptables *table,
 120                                 struct ipt_entry *entry)
 121 {
 122         unsigned int i;
 123
 124         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 125                 if ((table->info->valid_hooks & (1 << i))
 126                 && get_entry(table, table->info->hook_entry[i]) == entry)
 127                         return i;
 128         }
 129
 130         return -1;
 131 }
 132
 133 static unsigned long entry_to_offset(struct connman_iptables *table,
 134                                         struct ipt_entry *entry)
 135 {
 136         return (void *)entry - (void *)table->blob_entries->entrytable;
 137 }
 138
 139 static int target_to_verdict(char *target_name)
 140 {
 141         if (!strcmp(target_name, LABEL_ACCEPT))
 142                 return -NF_ACCEPT - 1;
 143
 144         if (!strcmp(target_name, LABEL_DROP))
 145                 return -NF_DROP - 1;
 146
 147         if (!strcmp(target_name, LABEL_QUEUE))
 148                 return -NF_QUEUE - 1;
 149
 150         if (!strcmp(target_name, LABEL_RETURN))
 151                 return XT_RETURN;
 152
 153         return 0;
 154 }
 155
 156 static gboolean is_builtin_target(char *target_name)
 157 {
 158         if (!strcmp(target_name, LABEL_ACCEPT) ||
 159                 !strcmp(target_name, LABEL_DROP) ||
 160                 !strcmp(target_name, LABEL_QUEUE) ||
 161                 !strcmp(target_name, LABEL_RETURN))
 162                 return TRUE;
 163
 164         return FALSE;
 165 }
 166
 167 static gboolean is_jump(struct connman_iptables_entry *e)
 168 {
 169         struct xt_entry_target *target;
 170
 171         target = ipt_get_target(e->entry);
 172
 173         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 174                 struct xt_standard_target *t;
 175
 176                 t = (struct xt_standard_target *)target;
 177
 178                 switch (t->verdict) {
 179                 case XT_RETURN:
 180                 case -NF_ACCEPT - 1:
 181                 case -NF_DROP - 1:
 182                 case -NF_QUEUE - 1:
 183                 case -NF_STOP - 1:
 184                         return false;
 185
 186                 default:
 187                         return true;
 188                 }
 189         }
 190
 191         return false;
 192 }
 193
 194 static gboolean is_chain(struct connman_iptables *table,
 195                                 struct connman_iptables_entry *e)
 196 {
 197         struct ipt_entry *entry;
 198         struct xt_entry_target *target;
 199
 200         entry = e->entry;
 201         if (e->builtin >= 0)
 202                 return TRUE;
 203
 204         target = ipt_get_target(entry);
 205         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
 206                 return TRUE;
 207
 208         return FALSE;
 209 }
 210
 211 static GList *find_chain_head(struct connman_iptables *table,
 212                                 char *chain_name)
 213 {
 214         GList *list;
 215         struct connman_iptables_entry *head;
 216         struct ipt_entry *entry;
 217         struct xt_entry_target *target;
 218         int builtin;
 219
 220         for (list = table->entries; list; list = list->next) {
 221                 head = list->data;
 222                 entry = head->entry;
 223
 224                 /* Buit-in chain */
 225                 builtin = head->builtin;
 226                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 227                         break;
 228
 229                 /* User defined chain */
 230                 target = ipt_get_target(entry);
 231                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 232                     !strcmp((char *)target->data, chain_name))
 233                         break;
 234         }
 235
 236         return list;
 237 }
 238
 239 static GList *find_chain_tail(struct connman_iptables *table,
 240                                 char *chain_name)
 241 {
 242         GList *chain_head, *list;
 243         struct connman_iptables_entry *tail;
 244
 245         chain_head = find_chain_head(table, chain_name);
 246         if (chain_head == NULL)
 247                 return NULL;
 248
 249         /* Then we look for the next chain */
 250         for (list = chain_head->next; list; list = list->next) {
 251                 tail = list->data;
 252
 253                 if (is_chain(table, tail))
 254                         return list;
 255         }
 256
 257         /* Nothing found, we return the table end */
 258         return g_list_last(table->entries);
 259 }
 260
 261 static void update_offsets(struct connman_iptables *table)
 262 {
 263         GList *list, *prev;
 264         struct connman_iptables_entry *entry, *prev_entry;
 265
 266         for (list = table->entries; list; list = list->next) {
 267                 entry = list->data;
 268
 269                 if (list == table->entries) {
 270                         entry->offset = 0;
 271
 272                         continue;
 273                 }
 274
 275                 prev = list->prev;
 276                 prev_entry = prev->data;
 277
 278                 entry->offset = prev_entry->offset +
 279                                         prev_entry->entry->next_offset;
 280         }
 281 }
 282
 283 static void update_targets_reference(struct connman_iptables *table,
 284                                 struct connman_iptables_entry *entry_before,
 285                                 struct connman_iptables_entry *modified_entry,
 286                                 gboolean is_removing)
 287 {
 288         struct connman_iptables_entry *tmp;
 289         struct xt_standard_target *t;
 290         GList *list;
 291         int offset;
 292
 293         offset = modified_entry->entry->next_offset;
 294
 295         for (list = table->entries; list; list = list->next) {
 296                 tmp = list->data;
 297
 298                 if (!is_jump(tmp))
 299                         continue;
 300
 301                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 302
 303                 if (is_removing == TRUE) {
 304                         if (t->verdict >= entry_before->offset)
 305                                 t->verdict -= offset;
 306                 } else {
 307                         if (t->verdict > entry_before->offset)
 308                                 t->verdict += offset;
 309                 }
 310         }
 311 }
 312
 313 static int connman_add_entry(struct connman_iptables *table,
 314                                 struct ipt_entry *entry, GList *before,
 315                                         int builtin)
 316 {
 317         struct connman_iptables_entry *e, *entry_before;
 318
 319         if (table == NULL)
 320                 return -1;
 321
 322         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 323         if (e == NULL)
 324                 return -1;
 325
 326         e->entry = entry;
 327         e->builtin = builtin;
 328
 329         table->entries = g_list_insert_before(table->entries, before, e);
 330         table->num_entries++;
 331         table->size += entry->next_offset;
 332
 333         if (before == NULL) {
 334                 e->offset = table->size - entry->next_offset;
 335
 336                 return 0;
 337         }
 338
 339         entry_before = before->data;
 340
 341         /*
 342          * We've just appended/insterted a new entry. All references
 343          * should be bumped accordingly.
 344          */
 345         update_targets_reference(table, entry_before, e, FALSE);
 346
 347         update_offsets(table);
 348
 349         return 0;
 350 }
 351
 352 static int remove_table_entry(struct connman_iptables *table,
 353                                         struct connman_iptables_entry *entry)
 354 {
 355         int removed = 0;
 356
 357         table->num_entries--;
 358         table->size -= entry->entry->next_offset;
 359         removed = entry->entry->next_offset;
 360
 361         g_free(entry->entry);
 362
 363         table->entries = g_list_remove(table->entries, entry);
 364
 365         return removed;
 366 }
 367
 368 static int connman_iptables_flush_chain(struct connman_iptables *table,
 369                                                 char *name)
 370 {
 371         GList *chain_head, *chain_tail, *list, *next;
 372         struct connman_iptables_entry *entry;
 373         int builtin, removed = 0;
 374
 375         chain_head = find_chain_head(table, name);
 376         if (chain_head == NULL)
 377                 return -EINVAL;
 378
 379         chain_tail = find_chain_tail(table, name);
 380         if (chain_tail == NULL)
 381                 return -EINVAL;
 382
 383         entry = chain_head->data;
 384         builtin = entry->builtin;
 385
 386         if (builtin >= 0)
 387                 list = chain_head;
 388         else
 389                 list = chain_head->next;
 390
 391         if (list == chain_tail->prev)
 392                 return 0;
 393
 394         while (list != chain_tail->prev) {
 395                 entry = list->data;
 396                 next = g_list_next(list);
 397
 398                 removed += remove_table_entry(table, entry);
 399
 400                 list = next;
 401         }
 402
 403         if (builtin >= 0) {
 404                 struct connman_iptables_entry *e;
 405
 406                 entry = list->data;
 407
 408                 entry->builtin = builtin;
 409
 410                 table->underflow[builtin] -= removed;
 411
 412                 for (list = chain_tail; list; list = list->next) {
 413                         e = list->data;
 414
 415                         builtin = e->builtin;
 416                         if (builtin < 0)
 417                                 continue;
 418
 419                         table->hook_entry[builtin] -= removed;
 420                         table->underflow[builtin] -= removed;
 421                 }
 422         }
 423
 424         update_offsets(table);
 425
 426         return 0;
 427 }
 428
 429 static int connman_iptables_delete_chain(struct connman_iptables *table,
 430                                                 char *name)
 431 {
 432         GList *chain_head, *chain_tail;
 433         struct connman_iptables_entry *entry;
 434
 435         chain_head = find_chain_head(table, name);
 436         if (chain_head == NULL)
 437                 return -EINVAL;
 438
 439         entry = chain_head->data;
 440
 441         /* We cannot remove builtin chain */
 442         if (entry->builtin >= 0)
 443                 return -EINVAL;
 444
 445         chain_tail = find_chain_tail(table, name);
 446         if (chain_tail == NULL)
 447                 return -EINVAL;
 448
 449         /* Chain must be flushed */
 450         if (chain_head->next != chain_tail->prev)
 451                 return -EINVAL;
 452
 453         remove_table_entry(table, entry);
 454
 455         entry = chain_tail->prev->data;
 456         remove_table_entry(table, entry);
 457
 458         update_offsets(table);
 459
 460         return 0;
 461 }
 462
 463 static int connman_iptables_add_chain(struct connman_iptables *table,
 464                                         char *name)
 465 {
 466         GList *last;
 467         struct ipt_entry *entry_head;
 468         struct ipt_entry *entry_return;
 469         struct error_target *error;
 470         struct ipt_standard_target *standard;
 471         u_int16_t entry_head_size, entry_return_size;
 472
 473         last = g_list_last(table->entries);
 474
 475         /*
 476          * An empty chain is composed of:
 477          * - A head entry, with no match and an error target.
 478          *   The error target data is the chain name.
 479          * - A tail entry, with no match and a standard target.
 480          *   The standard target verdict is XT_RETURN (return to the
 481          *   caller).
 482          */
 483
 484         /* head entry */
 485         entry_head_size = sizeof(struct ipt_entry) +
 486                                 sizeof(struct error_target);
 487         entry_head = g_try_malloc0(entry_head_size);
 488         if (entry_head == NULL)
 489                 goto err_head;
 490
 491         memset(entry_head, 0, entry_head_size);
 492
 493         entry_head->target_offset = sizeof(struct ipt_entry);
 494         entry_head->next_offset = entry_head_size;
 495
 496         error = (struct error_target *) entry_head->elems;
 497         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 498         error->t.u.user.target_size = ALIGN(sizeof(struct error_target));
 499         strcpy(error->error, name);
 500
 501         if (connman_add_entry(table, entry_head, last, -1) < 0)
 502                 goto err_head;
 503
 504         /* tail entry */
 505         entry_return_size = sizeof(struct ipt_entry) +
 506                                 sizeof(struct ipt_standard_target);
 507         entry_return = g_try_malloc0(entry_return_size);
 508         if (entry_return == NULL)
 509                 goto err;
 510
 511         memset(entry_return, 0, entry_return_size);
 512
 513         entry_return->target_offset = sizeof(struct ipt_entry);
 514         entry_return->next_offset = entry_return_size;
 515
 516         standard = (struct ipt_standard_target *) entry_return->elems;
 517         standard->target.u.user.target_size =
 518                                 ALIGN(sizeof(struct ipt_standard_target));
 519         standard->verdict = XT_RETURN;
 520
 521         if (connman_add_entry(table, entry_return, last, -1) < 0)
 522                 goto err;
 523
 524         return 0;
 525
 526 err:
 527         g_free(entry_return);
 528 err_head:
 529         g_free(entry_head);
 530
 531         return -ENOMEM;
 532 }
 533
 534 static struct ipt_entry *new_rule(struct ipt_ip *ip,
 535                         char *target_name, struct xtables_target *xt_t,
 536                         struct xtables_rule_match *xt_rm)
 537 {
 538         struct xtables_rule_match *tmp_xt_rm;
 539         struct ipt_entry *new_entry;
 540         size_t match_size, target_size;
 541
 542         match_size = 0;
 543         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL; tmp_xt_rm = tmp_xt_rm->next)
 544                 match_size += tmp_xt_rm->match->m->u.match_size;
 545
 546         if (xt_t)
 547                 target_size = ALIGN(xt_t->t->u.target_size);
 548         else
 549                 target_size = ALIGN(sizeof(struct xt_standard_target));
 550
 551         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 552                                                                 match_size);
 553         if (new_entry == NULL)
 554                 return NULL;
 555
 556         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 557
 558         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 559         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 560                                                                 match_size;
 561
 562         match_size = 0;
 563         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
 564                                 tmp_xt_rm = tmp_xt_rm->next) {
 565                 memcpy(new_entry->elems + match_size, tmp_xt_rm->match->m,
 566                                         tmp_xt_rm->match->m->u.match_size);
 567                 match_size += tmp_xt_rm->match->m->u.match_size;
 568         }
 569
 570         if (xt_t) {
 571                 struct xt_entry_target *entry_target;
 572
 573                 entry_target = ipt_get_target(new_entry);
 574                 memcpy(entry_target, xt_t->t, target_size);
 575         }
 576
 577         return new_entry;
 578 }
 579
 580 static void update_hooks(struct connman_iptables *table, GList *chain_head,
 581                                 struct ipt_entry *entry)
 582 {
 583         GList *list;
 584         struct connman_iptables_entry *head, *e;
 585         int builtin;
 586
 587         if (chain_head == NULL)
 588                 return;
 589
 590         head = chain_head->data;
 591
 592         builtin = head->builtin;
 593         if (builtin < 0)
 594                 return;
 595
 596         table->underflow[builtin] += entry->next_offset;
 597
 598         for (list = chain_head->next; list; list = list->next) {
 599                 e = list->data;
 600
 601                 builtin = e->builtin;
 602                 if (builtin < 0)
 603                         continue;
 604
 605                 table->hook_entry[builtin] += entry->next_offset;
 606                 table->underflow[builtin] += entry->next_offset;
 607         }
 608 }
 609
 610 static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
 611                                 struct ipt_ip *ip, char *chain_name,
 612                                 char *target_name, struct xtables_target *xt_t,
 613                                 int *builtin, struct xtables_rule_match *xt_rm)
 614 {
 615         GList *chain_tail, *chain_head;
 616         struct ipt_entry *new_entry;
 617         struct connman_iptables_entry *head;
 618
 619         chain_head = find_chain_head(table, chain_name);
 620         if (chain_head == NULL)
 621                 return NULL;
 622
 623         chain_tail = find_chain_tail(table, chain_name);
 624         if (chain_tail == NULL)
 625                 return NULL;
 626
 627         new_entry = new_rule(ip, target_name, xt_t, xt_rm);
 628         if (new_entry == NULL)
 629                 return NULL;
 630
 631         update_hooks(table, chain_head, new_entry);
 632
 633         /*
 634          * If the chain is builtin, and does not have any rule,
 635          * then the one that we're inserting is becoming the head
 636          * and thus needs the builtin flag.
 637          */
 638         head = chain_head->data;
 639         if (head->builtin < 0)
 640                 *builtin = -1;
 641         else if (chain_head == chain_tail->prev) {
 642                 *builtin = head->builtin;
 643                 head->builtin = -1;
 644         }
 645
 646         return new_entry;
 647 }
 648
 649 static int connman_iptables_append_rule(struct connman_iptables *table,
 650                                 struct ipt_ip *ip, char *chain_name,
 651                                 char *target_name, struct xtables_target *xt_t,
 652                                 struct xtables_rule_match *xt_rm)
 653 {
 654         GList *chain_tail;
 655         struct ipt_entry *new_entry;
 656         int builtin = -1, ret;
 657
 658         chain_tail = find_chain_tail(table, chain_name);
 659         if (chain_tail == NULL)
 660                 return -EINVAL;
 661
 662         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 663                                         target_name, xt_t, &builtin, xt_rm);
 664         if (new_entry == NULL)
 665                 return -EINVAL;
 666
 667         ret = connman_add_entry(table, new_entry, chain_tail->prev, builtin);
 668         if (ret < 0)
 669                 g_free(new_entry);
 670
 671         return ret;
 672 }
 673
 674 static int connman_iptables_insert_rule(struct connman_iptables *table,
 675                                 struct ipt_ip *ip, char *chain_name,
 676                                 char *target_name, struct xtables_target *xt_t,
 677                                 struct xtables_rule_match *xt_rm)
 678 {
 679         GList *chain_head;
 680         struct ipt_entry *new_entry;
 681         int builtin = -1, ret;
 682
 683         chain_head = find_chain_head(table, chain_name);
 684         if (chain_head == NULL)
 685                 return -EINVAL;
 686
 687         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 688                                         target_name, xt_t, &builtin, xt_rm);
 689         if (new_entry == NULL)
 690                 return -EINVAL;
 691
 692         if (builtin == -1)
 693                 chain_head = chain_head->next;
 694
 695         ret = connman_add_entry(table, new_entry, chain_head, builtin);
 696         if (ret < 0)
 697                 g_free(new_entry);
 698
 699         return ret;
 700 }
 701
 702 static gboolean is_same_ipt_entry(struct ipt_entry *i_e1,
 703                                         struct ipt_entry *i_e2)
 704 {
 705         if (memcmp(&i_e1->ip, &i_e2->ip, sizeof(struct ipt_ip)) != 0)
 706                 return FALSE;
 707
 708         if (i_e1->target_offset != i_e2->target_offset)
 709                 return FALSE;
 710
 711         if (i_e1->next_offset != i_e2->next_offset)
 712                 return FALSE;
 713
 714         return TRUE;
 715 }
 716
 717 static gboolean is_same_target(struct xt_entry_target *xt_e_t1,
 718                                         struct xt_entry_target *xt_e_t2)
 719 {
 720         if (xt_e_t1 == NULL || xt_e_t2 == NULL)
 721                 return FALSE;
 722
 723         if (strcmp(xt_e_t1->u.user.name, IPT_STANDARD_TARGET) == 0) {
 724                 struct xt_standard_target *xt_s_t1;
 725                 struct xt_standard_target *xt_s_t2;
 726
 727                 xt_s_t1 = (struct xt_standard_target *) xt_e_t1;
 728                 xt_s_t2 = (struct xt_standard_target *) xt_e_t2;
 729
 730                 if (xt_s_t1->verdict != xt_s_t2->verdict)
 731                         return FALSE;
 732         } else {
 733                 if (xt_e_t1->u.target_size != xt_e_t2->u.target_size)
 734                         return FALSE;
 735
 736                 if (strcmp(xt_e_t1->u.user.name, xt_e_t2->u.user.name) != 0)
 737                         return FALSE;
 738         }
 739
 740         return TRUE;
 741 }
 742
 743 static gboolean is_same_match(struct xt_entry_match *xt_e_m1,
 744                                 struct xt_entry_match *xt_e_m2)
 745 {
 746         if (xt_e_m1 == NULL || xt_e_m2 == NULL)
 747                 return FALSE;
 748
 749         if (xt_e_m1->u.match_size != xt_e_m2->u.match_size)
 750                 return FALSE;
 751
 752         if (xt_e_m1->u.user.revision != xt_e_m2->u.user.revision)
 753                 return FALSE;
 754
 755         if (strcmp(xt_e_m1->u.user.name, xt_e_m2->u.user.name) != 0)
 756                 return FALSE;
 757
 758         return TRUE;
 759 }
 760
 761 static GList *find_existing_rule(struct connman_iptables *table,
 762                                 struct ipt_ip *ip, char *chain_name,
 763                                 char *target_name, struct xtables_target *xt_t,
 764                                 struct xtables_match *xt_m,
 765                                 struct xtables_rule_match *xt_rm)
 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;
 773
 774         chain_head = find_chain_head(table, chain_name);
 775         if (chain_head == NULL)
 776                 return NULL;
 777
 778         chain_tail = find_chain_tail(table, chain_name);
 779         if (chain_tail == NULL)
 780                 return NULL;
 781
 782         if (!xt_t && !xt_m)
 783                 return NULL;
 784
 785         entry_test = new_rule(ip, target_name, xt_t, xt_rm);
 786         if (entry_test == NULL)
 787                 return NULL;
 788
 789         if (xt_t != NULL)
 790                 xt_e_t = ipt_get_target(entry_test);
 791         if (xt_m != NULL)
 792                 xt_e_m = (struct xt_entry_match *)entry_test->elems;
 793
 794         entry = chain_head->data;
 795         builtin = entry->builtin;
 796
 797         if (builtin >= 0)
 798                 list = chain_head;
 799         else
 800                 list = chain_head->next;
 801
 802         for (; list != chain_tail->prev; list = list->next) {
 803                 struct connman_iptables_entry *tmp;
 804                 struct ipt_entry *tmp_e;
 805
 806                 tmp = list->data;
 807                 tmp_e = tmp->entry;
 808
 809                 if (is_same_ipt_entry(entry_test, tmp_e) == FALSE)
 810                         continue;
 811
 812                 if (xt_t != NULL) {
 813                         struct xt_entry_target *tmp_xt_e_t;
 814
 815                         tmp_xt_e_t = ipt_get_target(tmp_e);
 816
 817                         if (!is_same_target(tmp_xt_e_t, xt_e_t))
 818                                 continue;
 819                 }
 820
 821                 if (xt_m != NULL) {
 822                         struct xt_entry_match *tmp_xt_e_m;
 823
 824                         tmp_xt_e_m = (struct xt_entry_match *)tmp_e->elems;
 825
 826                         if (!is_same_match(tmp_xt_e_m, xt_e_m))
 827                                 continue;
 828                 }
 829
 830                 break;
 831         }
 832
 833         g_free(entry_test);
 834
 835         if (list != chain_tail->prev)
 836                 return list;
 837
 838         return NULL;
 839 }
 840
 841 static int connman_iptables_delete_rule(struct connman_iptables *table,
 842                                 struct ipt_ip *ip, char *chain_name,
 843                                 char *target_name, struct xtables_target *xt_t,
 844                                 struct xtables_match *xt_m,
 845                                 struct xtables_rule_match *xt_rm)
 846 {
 847         struct connman_iptables_entry *entry;
 848         GList *chain_tail, *list;
 849         int builtin, removed;
 850
 851         removed = 0;
 852
 853         chain_tail = find_chain_tail(table, chain_name);
 854         if (chain_tail == NULL)
 855                 return -EINVAL;
 856
 857         list = find_existing_rule(table, ip, chain_name, target_name,
 858                                                         xt_t, xt_m, xt_rm);
 859         if (list == NULL)
 860                 return -EINVAL;
 861
 862         entry = list->data;
 863
 864         if (entry == NULL)
 865                 return -EINVAL;
 866
 867         builtin = entry->builtin;
 868
 869         /* We have deleted a rule,
 870          * all references should be bumped accordingly */
 871         if (list->next != NULL)
 872                 update_targets_reference(table, list->next->data,
 873                                                 list->data, TRUE);
 874
 875         removed += remove_table_entry(table, entry);
 876
 877         if (builtin >= 0) {
 878                 list = list->next;
 879                 if (list) {
 880                         entry = list->data;
 881                         entry->builtin = builtin;
 882                 }
 883
 884                 table->underflow[builtin] -= removed;
 885                 for (list = chain_tail; list; list = list->next) {
 886                         entry = list->data;
 887
 888                         builtin = entry->builtin;
 889                         if (builtin < 0)
 890                                 continue;
 891
 892                         table->hook_entry[builtin] -= removed;
 893                         table->underflow[builtin] -= removed;
 894                 }
 895         }
 896
 897         update_offsets(table);
 898
 899         return 0;
 900 }
 901
 902 static int connman_iptables_compare_rule(struct connman_iptables *table,
 903                                 struct ipt_ip *ip, char *chain_name,
 904                                 char *target_name, struct xtables_target *xt_t,
 905                                 struct xtables_match *xt_m,
 906                                 struct xtables_rule_match *xt_rm)
 907 {
 908         struct connman_iptables_entry *entry;
 909         GList *found;
 910
 911         found = find_existing_rule(table, ip, chain_name, target_name,
 912                                                         xt_t, xt_m, xt_rm);
 913         if (found == NULL)
 914                 return -EINVAL;
 915
 916         entry = found->data;
 917         if (entry == NULL)
 918                 return -EINVAL;
 919
 920         return 0;
 921 }
 922
 923
 924 static int connman_iptables_change_policy(struct connman_iptables *table,
 925                                                 char *chain_name, char *policy)
 926 {
 927         GList *chain_head;
 928         struct connman_iptables_entry *entry;
 929         struct xt_entry_target *target;
 930         struct xt_standard_target *t;
 931         int verdict;
 932
 933         verdict = target_to_verdict(policy);
 934         if (verdict == 0)
 935                 return -EINVAL;
 936
 937         chain_head = find_chain_head(table, chain_name);
 938         if (chain_head == NULL)
 939                 return -EINVAL;
 940
 941         entry = chain_head->data;
 942         if (entry->builtin < 0)
 943                 return -EINVAL;
 944
 945         target = ipt_get_target(entry->entry);
 946
 947         t = (struct xt_standard_target *)target;
 948         t->verdict = verdict;
 949
 950         return 0;
 951 }
 952
 953 static struct ipt_replace *connman_iptables_blob(struct connman_iptables *table)
 954 {
 955         struct ipt_replace *r;
 956         GList *list;
 957         struct connman_iptables_entry *e;
 958         unsigned char *entry_index;
 959
 960         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 961         if (r == NULL)
 962                 return NULL;
 963
 964         memset(r, 0, sizeof(*r) + table->size);
 965
 966         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 967                                 * table->old_entries);
 968         if (r->counters == NULL) {
 969                 g_free(r);
 970                 return NULL;
 971         }
 972
 973         strcpy(r->name, table->info->name);
 974         r->num_entries = table->num_entries;
 975         r->size = table->size;
 976
 977         r->num_counters = table->old_entries;
 978         r->valid_hooks  = table->info->valid_hooks;
 979
 980         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 981         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 982
 983         entry_index = (unsigned char *)r->entries;
 984         for (list = table->entries; list; list = list->next) {
 985                 e = list->data;
 986
 987                 memcpy(entry_index, e->entry, e->entry->next_offset);
 988                 entry_index += e->entry->next_offset;
 989         }
 990
 991         return r;
 992 }
 993
 994 static void dump_target(struct connman_iptables *table,
 995                                 struct ipt_entry *entry)
 996
 997 {
 998         struct xtables_target *xt_t;
 999         struct xt_entry_target *target;
1000
1001         target = ipt_get_target(entry);
1002
1003         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
1004                 struct xt_standard_target *t;
1005
1006                 t = (struct xt_standard_target *)target;
1007
1008                 switch (t->verdict) {
1009                 case XT_RETURN:
1010                         printf("\ttarget RETURN\n");
1011                         break;
1012
1013                 case -NF_ACCEPT - 1:
1014                         printf("\ttarget ACCEPT\n");
1015                         break;
1016
1017                 case -NF_DROP - 1:
1018                         printf("\ttarget DROP\n");
1019                         break;
1020
1021                 case -NF_QUEUE - 1:
1022                         printf("\ttarget QUEUE\n");
1023                         break;
1024
1025                 case -NF_STOP - 1:
1026                         printf("\ttarget STOP\n");
1027                         break;
1028
1029                 default:
1030                         printf("\tJUMP @%p (0x%x)\n",
1031                                 (char*)table->blob_entries->entrytable +
1032                                 t->verdict, t->verdict);
1033                         break;
1034                 }
1035
1036                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1037                                                 XTF_LOAD_MUST_SUCCEED);
1038
1039                 if(xt_t->print != NULL)
1040                         xt_t->print(NULL, target, 1);
1041         } else {
1042                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
1043                 if (xt_t == NULL) {
1044                         printf("\ttarget %s\n", target->u.user.name);
1045                         return;
1046                 }
1047
1048                 if(xt_t->print != NULL) {
1049                         printf("\ttarget ");
1050                         xt_t->print(NULL, target, 1);
1051                         printf("\n");
1052                 }
1053         }
1054 }
1055
1056 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
1057 {
1058         struct xtables_match *xt_m;
1059         struct xt_entry_match *match;
1060
1061         if (entry->elems == (unsigned char *)entry + entry->target_offset)
1062                 return;
1063
1064         match = (struct xt_entry_match *) entry->elems;
1065
1066         if (!strlen(match->u.user.name))
1067                 return;
1068
1069         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
1070         if (xt_m == NULL)
1071                 goto out;
1072
1073         if(xt_m->print != NULL) {
1074                 printf("\tmatch ");
1075                 xt_m->print(NULL, match, 1);
1076                 printf("\n");
1077
1078                 return;
1079         }
1080
1081 out:
1082         printf("\tmatch %s\n", match->u.user.name);
1083
1084 }
1085
1086 static int connman_iptables_dump_entry(struct ipt_entry *entry,
1087                                         struct connman_iptables *table)
1088 {
1089         struct xt_entry_target *target;
1090         unsigned int offset;
1091         int builtin;
1092
1093         offset = (char *)entry - (char *)table->blob_entries->entrytable;
1094         target = ipt_get_target(entry);
1095         builtin = is_hook_entry(table, entry);
1096
1097         if (entry_to_offset(table, entry) + entry->next_offset ==
1098                                         table->blob_entries->size) {
1099                 printf("End of CHAIN 0x%x\n", offset);
1100                 return 0;
1101         }
1102
1103         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
1104                 printf("USER CHAIN (%s) %p  match %p  target %p  size %d\n",
1105                         target->data, entry, entry->elems,
1106                         (char *)entry + entry->target_offset,
1107                                 entry->next_offset);
1108
1109                 return 0;
1110         } else if (builtin >= 0) {
1111                 printf("CHAIN (%s) %p  match %p  target %p  size %d\n",
1112                         hooknames[builtin], entry, entry->elems,
1113                         (char *)entry + entry->target_offset,
1114                                 entry->next_offset);
1115         } else {
1116                 printf("RULE %p  match %p  target %p  size %d\n", entry,
1117                         entry->elems,
1118                         (char *)entry + entry->target_offset,
1119                                 entry->next_offset);
1120         }
1121
1122         dump_match(table, entry);
1123         dump_target(table, entry);
1124
1125         return 0;
1126 }
1127
1128 static void connman_iptables_dump_hook(struct connman_iptables *table)
1129 {
1130         int i;
1131         printf("hooks: \n");
1132         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1133                 if ((table->info->valid_hooks & (1 << i)))
1134                         printf("%s entry %p underflow %p (%#x)\n",
1135                                 hooknames[i],
1136                                 table->blob_entries->entrytable +
1137                                                 table->info->hook_entry[i],
1138                                 table->blob_entries->entrytable +
1139                                                 table->info->underflow[i],
1140                                         table->info->underflow[i]);
1141         }
1142 }
1143
1144 static void connman_iptables_dump(struct connman_iptables *table)
1145 {
1146         printf("%s valid_hooks=0x%08x, num_entries=%u, size=%u\n",
1147                 table->info->name,
1148                 table->info->valid_hooks, table->info->num_entries,
1149                 table->info->size);
1150
1151         connman_iptables_dump_hook(table);
1152
1153         ENTRY_ITERATE(table->blob_entries->entrytable,
1154                         table->blob_entries->size,
1155                         connman_iptables_dump_entry, table);
1156
1157 }
1158
1159 static int connman_iptables_get_entries(struct connman_iptables *table)
1160 {
1161         socklen_t entry_size;
1162
1163         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
1164
1165         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
1166                                 table->blob_entries, &entry_size);
1167 }
1168
1169 static int connman_iptables_replace(struct connman_iptables *table,
1170                                         struct ipt_replace *r)
1171 {
1172         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
1173                          sizeof(*r) + r->size);
1174 }
1175
1176 static void connman_iptables_cleanup(struct connman_iptables *table)
1177 {
1178         GList *list;
1179         struct connman_iptables_entry *entry;
1180
1181         close(table->ipt_sock);
1182
1183         for (list = table->entries; list; list = list->next) {
1184                 entry = list->data;
1185
1186                 g_free(entry->entry);
1187         }
1188
1189         g_free(table->info);
1190         g_free(table->blob_entries);
1191         g_free(table);
1192
1193         xtables_free_opts(1);
1194 }
1195
1196 static int connman_iptables_commit(struct connman_iptables *table)
1197 {
1198         struct ipt_replace *repl;
1199
1200         repl = connman_iptables_blob(table);
1201
1202         return connman_iptables_replace(table, repl);
1203 }
1204
1205 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
1206 {
1207         struct ipt_entry *new_entry;
1208         int builtin;
1209
1210         new_entry = g_try_malloc0(entry->next_offset);
1211         if (new_entry == NULL)
1212                 return -ENOMEM;
1213
1214         memcpy(new_entry, entry, entry->next_offset);
1215
1216         builtin = is_hook_entry(table, entry);
1217
1218         return connman_add_entry(table, new_entry, NULL, builtin);
1219 }
1220
1221 static struct connman_iptables *connman_iptables_init(const char *table_name)
1222 {
1223         struct connman_iptables *table = NULL;
1224         char *module = NULL;
1225         socklen_t s;
1226
1227         if (xtables_insmod("ip_tables", NULL, TRUE) != 0)
1228                 goto err;
1229
1230         module = g_strconcat("iptable_", table_name, NULL);
1231         if (module == NULL)
1232                 goto err;
1233
1234         if (xtables_insmod(module, NULL, TRUE) != 0)
1235                 goto err;
1236
1237         g_free(module);
1238         module = NULL;
1239
1240         table =  g_try_new0(struct connman_iptables, 1);
1241         if (table == NULL)
1242                 return NULL;
1243
1244         table->info =  g_try_new0(struct ipt_getinfo, 1);
1245         if (table->info == NULL)
1246                 goto err;
1247
1248         table->ipt_sock = socket(AF_INET, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW);
1249         if (table->ipt_sock < 0)
1250                 goto err;
1251
1252         s = sizeof(*table->info);
1253         strcpy(table->info->name, table_name);
1254         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
1255                                                 table->info, &s) < 0)
1256                 goto err;
1257
1258         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
1259                                                 table->info->size);
1260         if (table->blob_entries == NULL)
1261                 goto err;
1262
1263         strcpy(table->blob_entries->name, table_name);
1264         table->blob_entries->size = table->info->size;
1265
1266         if (connman_iptables_get_entries(table) < 0)
1267                 goto err;
1268
1269         table->num_entries = 0;
1270         table->old_entries = table->info->num_entries;
1271         table->size = 0;
1272
1273         memcpy(table->underflow, table->info->underflow,
1274                                 sizeof(table->info->underflow));
1275         memcpy(table->hook_entry, table->info->hook_entry,
1276                                 sizeof(table->info->hook_entry));
1277
1278         ENTRY_ITERATE(table->blob_entries->entrytable,
1279                         table->blob_entries->size,
1280                                 add_entry, table);
1281
1282         return table;
1283
1284 err:
1285         g_free(module);
1286
1287         connman_iptables_cleanup(table);
1288
1289         return NULL;
1290 }
1291
1292 static struct option connman_iptables_opts[] = {
1293         {.name = "append",        .has_arg = 1, .val = 'A'},
1294         {.name = "compare",       .has_arg = 1, .val = 'C'},
1295         {.name = "delete",        .has_arg = 1, .val = 'D'},
1296         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
1297         {.name = "insert",        .has_arg = 1, .val = 'I'},
1298         {.name = "list",          .has_arg = 2, .val = 'L'},
1299         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
1300         {.name = "policy",        .has_arg = 1, .val = 'P'},
1301         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
1302         {.name = "destination",   .has_arg = 1, .val = 'd'},
1303         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
1304         {.name = "jump",          .has_arg = 1, .val = 'j'},
1305         {.name = "match",         .has_arg = 1, .val = 'm'},
1306         {.name = "out-interface", .has_arg = 1, .val = 'o'},
1307         {.name = "source",        .has_arg = 1, .val = 's'},
1308         {.name = "table",         .has_arg = 1, .val = 't'},
1309         {NULL},
1310 };
1311
1312 struct xtables_globals connman_iptables_globals = {
1313         .option_offset = 0,
1314         .opts = connman_iptables_opts,
1315         .orig_opts = connman_iptables_opts,
1316 };
1317
1318 static struct xtables_target *prepare_target(struct connman_iptables *table,
1319                                                         char *target_name)
1320 {
1321         struct xtables_target *xt_t = NULL;
1322         gboolean is_builtin, is_user_defined;
1323         GList *chain_head = NULL;
1324         size_t target_size;
1325
1326         is_builtin = FALSE;
1327         is_user_defined = FALSE;
1328
1329         if (is_builtin_target(target_name))
1330                 is_builtin = TRUE;
1331         else {
1332                 chain_head = find_chain_head(table, target_name);
1333                 if (chain_head != NULL && chain_head->next != NULL)
1334                         is_user_defined = TRUE;
1335         }
1336
1337         if (is_builtin || is_user_defined)
1338                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1339                                                 XTF_LOAD_MUST_SUCCEED);
1340         else
1341                 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1342
1343         if (xt_t == NULL)
1344                 return NULL;
1345
1346         target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1347
1348         xt_t->t = g_try_malloc0(target_size);
1349         if (xt_t->t == NULL)
1350                 return NULL;
1351
1352         xt_t->t->u.target_size = target_size;
1353
1354         if (is_builtin || is_user_defined) {
1355                 struct xt_standard_target *target;
1356
1357                 target = (struct xt_standard_target *)(xt_t->t);
1358                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
1359
1360                 if (is_builtin == TRUE)
1361                         target->verdict = target_to_verdict(target_name);
1362                 else if (is_user_defined == TRUE) {
1363                         struct connman_iptables_entry *target_rule;
1364
1365                         if (chain_head == NULL) {
1366                                 g_free(xt_t->t);
1367                                 return NULL;
1368                         }
1369
1370                         target_rule = chain_head->next->data;
1371                         target->verdict = target_rule->offset;
1372                 }
1373         } else {
1374                 strcpy(xt_t->t->u.user.name, target_name);
1375                 xt_t->t->u.user.revision = xt_t->revision;
1376                 if (xt_t->init != NULL)
1377                         xt_t->init(xt_t->t);
1378         }
1379
1380 #if XTABLES_VERSION_CODE > 5
1381         if (xt_t->x6_options != NULL)
1382                 connman_iptables_globals.opts =
1383                         xtables_options_xfrm(
1384                                 connman_iptables_globals.orig_opts,
1385
1386                                 connman_iptables_globals.opts,
1387                                 xt_t->x6_options,
1388                                 &xt_t->option_offset);
1389         else
1390 #endif
1391                 connman_iptables_globals.opts =
1392                         xtables_merge_options(
1393 #if XTABLES_VERSION_CODE > 5
1394                                 connman_iptables_globals.orig_opts,
1395 #endif
1396                                 connman_iptables_globals.opts,
1397                                 xt_t->extra_opts,
1398                                 &xt_t->option_offset);
1399
1400         if (connman_iptables_globals.opts == NULL) {
1401                 g_free(xt_t->t);
1402                 xt_t = NULL;
1403         }
1404
1405         return xt_t;
1406 }
1407
1408 static struct xtables_match *prepare_matches(struct connman_iptables *table,
1409                         struct xtables_rule_match **xt_rm, char *match_name)
1410 {
1411         struct xtables_match *xt_m;
1412         size_t match_size;
1413
1414         if (match_name == NULL)
1415                 return NULL;
1416
1417         xt_m = xtables_find_match(match_name, XTF_LOAD_MUST_SUCCEED, xt_rm);
1418         match_size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
1419
1420         xt_m->m = g_try_malloc0(match_size);
1421         if (xt_m->m == NULL)
1422                 return NULL;
1423
1424         xt_m->m->u.match_size = match_size;
1425         strcpy(xt_m->m->u.user.name, xt_m->name);
1426         xt_m->m->u.user.revision = xt_m->revision;
1427
1428         if (xt_m->init != NULL)
1429                 xt_m->init(xt_m->m);
1430
1431         if (xt_m == xt_m->next)
1432                 goto done;
1433
1434 #if XTABLES_VERSION_CODE > 5
1435         if (xt_m->x6_options != NULL)
1436                 connman_iptables_globals.opts =
1437                         xtables_options_xfrm(
1438                                 connman_iptables_globals.orig_opts,
1439                                 connman_iptables_globals.opts,
1440                                 xt_m->x6_options,
1441                                 &xt_m->option_offset);
1442         else
1443 #endif
1444                 connman_iptables_globals.opts =
1445                         xtables_merge_options(
1446 #if XTABLES_VERSION_CODE > 5
1447                                 connman_iptables_globals.orig_opts,
1448 #endif
1449                                 connman_iptables_globals.opts,
1450                                 xt_m->extra_opts,
1451                                 &xt_m->option_offset);
1452
1453         if (connman_iptables_globals.opts == NULL) {
1454                 g_free(xt_m->m);
1455                 xt_m = NULL;
1456         }
1457
1458 done:
1459         return xt_m;
1460 }
1461
1462 static int parse_ip_and_mask(const char *str, struct in_addr *ip, struct in_addr *mask)
1463 {
1464         char **tokens;
1465         uint32_t prefixlength;
1466         uint32_t tmp;
1467         int err;
1468
1469         tokens = g_strsplit(str, "/", 2);
1470         if (tokens == NULL)
1471                 return -1;
1472
1473         if (!inet_pton(AF_INET, tokens[0], ip)) {
1474                 err = -1;
1475                 goto out;
1476         }
1477
1478         if (tokens[1] != NULL) {
1479                 prefixlength = strtol(tokens[1], NULL, 10);
1480                 if (prefixlength > 31) {
1481                         err = -1;
1482                         goto out;
1483                 }
1484
1485                 tmp = ~(0xffffffff >> prefixlength);
1486         } else {
1487                 tmp = 0xffffffff;
1488         }
1489
1490         mask->s_addr = htonl(tmp);
1491         ip->s_addr = ip->s_addr & mask->s_addr;
1492         err = 0;
1493 out:
1494         g_strfreev(tokens);
1495
1496         return err;
1497 }
1498
1499 int main(int argc, char *argv[])
1500 {
1501         struct connman_iptables *table;
1502         struct xtables_rule_match *xt_rm, *tmp_xt_rm;
1503         struct xtables_match *xt_m, *xt_m_t;
1504         struct xtables_target *xt_t;
1505         struct ipt_ip ip;
1506         char *table_name, *chain, *new_chain, *match_name, *target_name;
1507         char *delete_chain, *flush_chain, *policy;
1508         int c, in_len, out_len;
1509         gboolean dump, invert, delete, insert, delete_rule, compare_rule;
1510
1511         xtables_init_all(&connman_iptables_globals, NFPROTO_IPV4);
1512
1513         dump = FALSE;
1514         invert = FALSE;
1515         delete = FALSE;
1516         insert = FALSE;
1517         delete_rule = FALSE;
1518         compare_rule = FALSE;
1519         chain = new_chain = match_name = target_name = NULL;
1520         delete_chain = flush_chain = policy = NULL;
1521         memset(&ip, 0, sizeof(struct ipt_ip));
1522         table = NULL;
1523         xt_rm = NULL;
1524         xt_m = NULL;
1525         xt_t = NULL;
1526
1527         /* extension's options will generate false-positives errors */
1528         opterr = 0;
1529
1530         while ((c = getopt_long(argc, argv,
1531                                 "-A:C:D:F:I:L::N:P:X:d:i:j:m:o:s:t:",
1532                                 connman_iptables_globals.opts, NULL)) != -1) {
1533                 switch (c) {
1534                 case 'A':
1535                         /* It is either -A, -C, -D or -I at once */
1536                         if (chain)
1537                                 goto out;
1538
1539                         chain = optarg;
1540                         break;
1541
1542                 case 'C':
1543                         /* It is either -A, -C, -D or -I at once */
1544                         if (chain)
1545                                 goto out;
1546
1547                         chain = optarg;
1548                         compare_rule = TRUE;
1549                         break;
1550
1551                 case 'D':
1552                         /* It is either -A, -C, -D or -I at once */
1553                         if (chain)
1554                                 goto out;
1555
1556                         chain = optarg;
1557                         delete_rule = TRUE;
1558                         break;
1559
1560                 case 'F':
1561                         flush_chain = optarg;
1562                         break;
1563
1564                 case 'I':
1565                         /* It is either -A, -C, -D or -I at once */
1566                         if (chain)
1567                                 goto out;
1568
1569                         chain = optarg;
1570                         insert = TRUE;
1571                         break;
1572
1573                 case 'L':
1574                         dump = true;
1575                         break;
1576
1577                 case 'N':
1578                         new_chain = optarg;
1579                         break;
1580
1581                 case 'P':
1582                         chain = optarg;
1583                         if (optind < argc)
1584                                 policy = argv[optind++];
1585                         else
1586                                 goto out;
1587
1588                         break;
1589
1590                 case 'X':
1591                         delete = true;
1592                         delete_chain = optarg;
1593                         break;
1594
1595                 case 'd':
1596                         if (!parse_ip_and_mask(optarg, &ip.dst, &ip.dmsk))
1597                                 break;
1598
1599                         if (invert)
1600                                 ip.invflags |= IPT_INV_DSTIP;
1601
1602
1603                         break;
1604
1605                 case 'i':
1606                         in_len = strlen(optarg);
1607
1608                         if (in_len + 1 > IFNAMSIZ)
1609                                 break;
1610
1611                         strcpy(ip.iniface, optarg);
1612                         memset(ip.iniface_mask, 0xff, in_len + 1);
1613
1614                         if (invert)
1615                                 ip.invflags |= IPT_INV_VIA_IN;
1616
1617                         break;
1618
1619                 case 'j':
1620                         target_name = optarg;
1621                         xt_t = prepare_target(table, target_name);
1622                         if (xt_t == NULL)
1623                                 goto out;
1624
1625                         break;
1626
1627                 case 'm':
1628                         match_name = optarg;
1629                         xt_m = prepare_matches(table, &xt_rm, match_name);
1630                         if (xt_m == NULL)
1631                                 goto out;
1632
1633                         break;
1634
1635                 case 'o':
1636                         out_len = strlen(optarg);
1637
1638                         if (out_len + 1 > IFNAMSIZ)
1639                                 break;
1640
1641                         strcpy(ip.outiface, optarg);
1642                         memset(ip.outiface_mask, 0xff, out_len + 1);
1643
1644                         if (invert)
1645                                 ip.invflags |= IPT_INV_VIA_OUT;
1646
1647                         break;
1648
1649                 case 's':
1650                         if (!parse_ip_and_mask(optarg, &ip.src, &ip.smsk))
1651                                 break;
1652
1653                         if (invert)
1654                                 ip.invflags |= IPT_INV_SRCIP;
1655
1656                         break;
1657
1658                 case 't':
1659                         table_name = optarg;
1660
1661                         table = connman_iptables_init(table_name);
1662                         if (table == NULL)
1663                                 return -1;
1664
1665                         break;
1666
1667                 case 1:
1668                         if (optarg[0] == '!' && optarg[1] == '\0') {
1669                                 if (invert)
1670                                         printf("Consecutive ! not allowed\n");
1671
1672                                 invert = TRUE;
1673                                 optarg[0] = '\0';
1674                                 continue;
1675                         }
1676
1677                         printf("Invalid option\n");
1678
1679                         return -1;
1680
1681                 default:
1682 #if XTABLES_VERSION_CODE > 5
1683                         if (xt_t != NULL && (xt_t->x6_parse != NULL ||
1684                                                 xt_t->parse != NULL) &&
1685                                         (c >= (int) xt_t->option_offset &&
1686                                         c < (int) xt_t->option_offset +
1687                                         XT_OPTION_OFFSET_SCALE)) {
1688                                 xtables_option_tpcall(c, argv,
1689                                                         invert, xt_t, NULL);
1690
1691                                 break;
1692                         }
1693
1694                         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1695                                                 tmp_xt_rm = tmp_xt_rm->next) {
1696                                 xt_m_t = tmp_xt_rm->match;
1697
1698                                 if (tmp_xt_rm->completed ||
1699                                                 (xt_m_t->x6_parse == NULL &&
1700                                                  xt_m_t->parse == NULL))
1701                                         continue;
1702
1703                                 if (c < (int) xt_m_t->option_offset ||
1704                                         c >= (int) xt_m_t->option_offset
1705                                         + XT_OPTION_OFFSET_SCALE)
1706                                         continue;
1707
1708                                 xtables_option_mpcall(c, argv,
1709                                                         invert, xt_m_t, NULL);
1710
1711                                 break;
1712                         }
1713 #else
1714                         if (xt_t == NULL || xt_t->parse == NULL ||
1715                                 !xt_t->parse(c - xt_t->option_offset,
1716                                 argv, invert, &xt_t->tflags, NULL, &xt_t->t)) {
1717
1718                                 for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1719                                                 tmp_xt_rm = tmp_xt_rm->next) {
1720                                         xt_m_t = tmp_xt_rm->match;
1721
1722                                         if (tmp_xt_rm->completed ||
1723                                                         xt_m_t->parse == NULL)
1724                                                 continue;
1725
1726                                         if (xt_m->parse(c - xt_m->option_offset,
1727                                                 argv, invert, &xt_m->mflags,
1728                                                 NULL, &xt_m->m))
1729                                                 break;
1730                                 }
1731                         }
1732 #endif
1733                         break;
1734                 }
1735
1736                 invert = FALSE;
1737         }
1738
1739 #if XTABLES_VERSION_CODE > 5
1740         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1741                                 tmp_xt_rm = tmp_xt_rm->next)
1742                 xtables_option_mfcall(tmp_xt_rm->match);
1743
1744         if (xt_t != NULL)
1745                 xtables_option_tfcall(xt_t);
1746 #else
1747         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1748                                 tmp_xt_rm = tmp_xt_rm->next)
1749                 if (tmp_xt_rm->match->final_check != NULL)
1750                         tmp_xt_rm->match->final_check(
1751                                         tmp_xt_rm->match->mflags);
1752
1753         if (xt_t != NULL && xt_t->final_check != NULL)
1754                 xt_t->final_check(xt_t->tflags);
1755 #endif
1756
1757         if (table == NULL) {
1758                 table_name = "filter";
1759
1760                 table = connman_iptables_init(table_name);
1761                 if (table == NULL)
1762                         return -1;
1763         }
1764
1765         if (delete) {
1766                 if (delete_chain == NULL)
1767                         goto out;
1768
1769                 printf("Delete chain %s\n", delete_chain);
1770
1771                 connman_iptables_delete_chain(table, delete_chain);
1772
1773                 goto commit;
1774         }
1775
1776         if (flush_chain) {
1777                 printf("Flush chain %s\n", flush_chain);
1778
1779                 connman_iptables_flush_chain(table, flush_chain);
1780
1781                 goto commit;
1782         }
1783
1784         if (dump) {
1785                 connman_iptables_dump(table);
1786
1787                 return 0;
1788         }
1789
1790         if (chain && new_chain)
1791                 return -1;
1792
1793         if (new_chain) {
1794                 printf("New chain %s\n", new_chain);
1795
1796                 connman_iptables_add_chain(table, new_chain);
1797
1798                 goto commit;
1799         }
1800
1801         if (chain) {
1802                 if (policy != NULL) {
1803                         printf("Changing policy of %s to %s\n", chain, policy);
1804
1805                         connman_iptables_change_policy(table, chain, policy);
1806
1807                         goto commit;
1808                 }
1809
1810                 if (compare_rule == TRUE) {
1811                         int ret;
1812
1813                         ret = connman_iptables_compare_rule(table, &ip,
1814                                 chain, target_name, xt_t, xt_m, xt_rm);
1815
1816                         if (ret == 0)
1817                                 printf("Rule exists.\n");
1818                         else
1819                                 printf("Rule does not exist.\n");
1820
1821                         goto out;
1822                 }
1823
1824                 if (delete_rule == TRUE) {
1825                         printf("Deleting %s to %s (match %s)\n", target_name,
1826                                         chain, match_name);
1827
1828                         connman_iptables_delete_rule(table, &ip, chain,
1829                                         target_name, xt_t, xt_m, xt_rm);
1830
1831                         goto commit;
1832                 }
1833
1834                 if (insert == TRUE) {
1835                         printf("Inserting %s to %s (match %s)\n", target_name,
1836                                         chain, match_name);
1837
1838                         connman_iptables_insert_rule(table, &ip, chain,
1839                                                 target_name, xt_t, xt_rm);
1840                 } else {
1841                         printf("Appending %s to %s (match %s)\n", target_name,
1842                                         chain, match_name);
1843
1844                         connman_iptables_append_rule(table, &ip, chain,
1845                                                 target_name, xt_t, xt_rm);
1846                 }
1847         }
1848
1849 commit:
1850
1851         connman_iptables_commit(table);
1852
1853 out:
1854         connman_iptables_cleanup(table);
1855
1856         if (xt_t)
1857                 g_free(xt_t->t);
1858
1859         if (xt_m)
1860                 g_free(xt_m->m);
1861
1862         return 0;
1863 }