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 ipt_error_target {
  86         struct xt_entry_target t;
  87         char error[IPT_TABLE_MAXNAMELEN];
  88 };
  89
  90 struct connman_iptables_entry {
  91         int jump_offset;
  92
  93         struct ipt_entry *entry;
  94 };
  95
  96 struct connman_iptables {
  97         int ipt_sock;
  98
  99         struct ipt_getinfo *info;
 100         struct ipt_get_entries *blob_entries;
 101
 102         unsigned int num_entries;
 103         unsigned int old_entries;
 104         unsigned int size;
 105
 106         GList *entries;
 107 };
 108
 109 static GHashTable *table_hash = NULL;
 110
 111 static struct ipt_entry *get_entry(struct connman_iptables *table,
 112                                         unsigned int offset)
 113 {
 114         return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
 115                                                                         offset);
 116 }
 117
 118 static int is_hook_entry(struct connman_iptables *table,
 119                                 struct ipt_entry *entry)
 120 {
 121         unsigned int i;
 122
 123         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 124                 if ((table->info->valid_hooks & (1 << i))
 125                 && get_entry(table, table->info->hook_entry[i]) == entry)
 126                         return i;
 127         }
 128
 129         return -1;
 130 }
 131
 132 static unsigned long entry_to_offset(struct connman_iptables *table,
 133                                         struct ipt_entry *entry)
 134 {
 135         return (void *)entry - (void *)table->blob_entries->entrytable;
 136 }
 137
 138 static int target_to_verdict(char *target_name)
 139 {
 140         if (!strcmp(target_name, LABEL_ACCEPT))
 141                 return -NF_ACCEPT - 1;
 142
 143         if (!strcmp(target_name, LABEL_DROP))
 144                 return -NF_DROP - 1;
 145
 146         if (!strcmp(target_name, LABEL_QUEUE))
 147                 return -NF_QUEUE - 1;
 148
 149         if (!strcmp(target_name, LABEL_RETURN))
 150                 return XT_RETURN;
 151
 152         return 0;
 153 }
 154
 155 static gboolean is_builtin_target(char *target_name)
 156 {
 157         if (!strcmp(target_name, LABEL_ACCEPT) ||
 158                 !strcmp(target_name, LABEL_DROP) ||
 159                 !strcmp(target_name, LABEL_QUEUE) ||
 160                 !strcmp(target_name, LABEL_RETURN))
 161                 return TRUE;
 162
 163         return FALSE;
 164 }
 165
 166 static gboolean is_chain(struct connman_iptables *table,
 167                                 struct connman_iptables_entry *e)
 168 {
 169         int builtin;
 170         struct ipt_entry *entry;
 171         struct xt_entry_target *target;
 172
 173         entry = e->entry;
 174         builtin = is_hook_entry(table, entry);
 175         if (builtin >= 0)
 176                 return TRUE;
 177
 178         target = ipt_get_target(entry);
 179         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
 180                 return TRUE;
 181
 182         return FALSE;
 183 }
 184
 185 static GList *find_chain_tail(struct connman_iptables *table,
 186                                 char *chain_name)
 187 {
 188         GList *chain_head, *list;
 189         struct connman_iptables_entry *head, *tail;
 190         struct ipt_entry *entry;
 191         struct xt_entry_target *target;
 192         int builtin;
 193
 194         /* First we look for the head */
 195         for (list = table->entries; list; list = list->next) {
 196                 head = list->data;
 197                 entry = head->entry;
 198
 199                 /* Buit-in chain */
 200                 builtin = is_hook_entry(table, entry);
 201                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 202                         break;
 203
 204                 /* User defined chain */
 205                 target = ipt_get_target(entry);
 206                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 207                     !strcmp((char *)target->data, chain_name))
 208                         break;
 209         }
 210
 211         if (list == NULL)
 212                 return NULL;
 213
 214         chain_head = list;
 215
 216         /* Then we look for the next chain */
 217         for (list = chain_head->next; list; list = list->next) {
 218                 tail = list->data;
 219                 entry = tail->entry;
 220
 221                 if (is_chain(table, tail))
 222                         return list;
 223         }
 224
 225         /* Nothing found, we return the table end */
 226         return g_list_last(table->entries);
 227 }
 228
 229 static int iptables_add_entry(struct connman_iptables *table,
 230                                 struct ipt_entry *entry, GList *before)
 231 {
 232         struct connman_iptables_entry *e;
 233
 234         if (table == NULL)
 235                 return -1;
 236
 237         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 238         if (e == NULL)
 239                 return -1;
 240
 241         e->entry = entry;
 242
 243         table->entries = g_list_insert_before(table->entries, before, e);
 244         table->num_entries++;
 245         table->size += entry->next_offset;
 246
 247         return 0;
 248 }
 249
 250 static int iptables_add_chain(struct connman_iptables *table,
 251                                         char *name)
 252 {
 253         GList *last;
 254         struct ipt_entry *entry_head;
 255         struct ipt_entry *entry_return;
 256         struct ipt_error_target *error;
 257         struct ipt_standard_target *standard;
 258         u_int16_t entry_head_size, entry_return_size;
 259
 260         last = g_list_last(table->entries);
 261
 262         /*
 263          * An empty chain is composed of:
 264          * - A head entry, with no match and an error target.
 265          *   The error target data is the chain name.
 266          * - A tail entry, with no match and a standard target.
 267          *   The standard target verdict is XT_RETURN (return to the
 268          *   caller).
 269          */
 270
 271         /* head entry */
 272         entry_head_size = sizeof(struct ipt_entry) +
 273                                 sizeof(struct ipt_error_target);
 274         entry_head = g_try_malloc0(entry_head_size);
 275         if (entry_head == NULL)
 276                 goto err;
 277
 278         memset(entry_head, 0, entry_head_size);
 279
 280         entry_head->target_offset = sizeof(struct ipt_entry);
 281         entry_head->next_offset = entry_head_size;
 282
 283         error = (struct ipt_error_target *) entry_head->elems;
 284         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 285         error->t.u.user.target_size = ALIGN(sizeof(struct ipt_error_target));
 286         strcpy(error->error, name);
 287
 288         if (iptables_add_entry(table, entry_head, last) < 0)
 289                 goto err;
 290
 291         /* tail entry */
 292         entry_return_size = sizeof(struct ipt_entry) +
 293                                 sizeof(struct ipt_standard_target);
 294         entry_return = g_try_malloc0(entry_return_size);
 295         if (entry_return == NULL)
 296                 goto err;
 297
 298         memset(entry_return, 0, entry_return_size);
 299
 300         entry_return->target_offset = sizeof(struct ipt_entry);
 301         entry_return->next_offset = entry_return_size;
 302
 303         standard = (struct ipt_standard_target *) entry_return->elems;
 304         standard->target.u.user.target_size =
 305                                 ALIGN(sizeof(struct ipt_standard_target));
 306         standard->verdict = XT_RETURN;
 307
 308         if (iptables_add_entry(table, entry_return, last) < 0)
 309                 goto err;
 310
 311         return 0;
 312
 313 err:
 314         g_free(entry_head);
 315         g_free(entry_return);
 316
 317         return -ENOMEM;
 318 }
 319
 320 static struct ipt_entry *
 321 new_rule(char *target_name, struct xtables_target *xt_t,
 322                 char *match_name, struct xtables_match *xt_m)
 323 {
 324         struct ipt_entry *new_entry;
 325         size_t match_size, target_size;
 326         int is_builtin = is_builtin_target(target_name);
 327
 328         if (xt_m)
 329                 match_size = xt_m->m->u.match_size;
 330         else
 331                 match_size = 0;
 332
 333         if (xt_t)
 334                 target_size = ALIGN(xt_t->t->u.target_size);
 335         else
 336                 target_size = 0;
 337
 338         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 339                                                                 match_size);
 340         if (new_entry == NULL)
 341                 return NULL;
 342
 343         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 344         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 345                                                                 match_size;
 346         if (xt_m) {
 347                 struct xt_entry_match *entry_match;
 348
 349                 entry_match = (struct xt_entry_match *)new_entry->elems;
 350                 memcpy(entry_match, xt_m->m, match_size);
 351         }
 352
 353         if (xt_t) {
 354                 struct xt_entry_target *entry_target;
 355
 356                 if (is_builtin) {
 357                         struct xt_standard_target *target;
 358
 359                         target = (struct xt_standard_target *)(xt_t->t);
 360                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 361                         target->verdict = target_to_verdict(target_name);
 362                 }
 363
 364                 entry_target = ipt_get_target(new_entry);
 365                 memcpy(entry_target, xt_t->t, target_size);
 366         }
 367
 368         return new_entry;
 369 }
 370
 371 static int
 372 iptables_add_rule(struct connman_iptables *table, char *chain_name,
 373                                 char *target_name, struct xtables_target *xt_t,
 374                                 char *match_name, struct xtables_match *xt_m)
 375 {
 376         GList *chain_tail;
 377         struct ipt_entry *new_entry;
 378
 379         chain_tail = find_chain_tail(table, chain_name);
 380         if (chain_tail == NULL)
 381                 return -EINVAL;
 382
 383         new_entry = new_rule(target_name, xt_t,
 384                                 match_name, xt_m);
 385         if (new_entry == NULL)
 386                 return -EINVAL;
 387
 388         return iptables_add_entry(table, new_entry, chain_tail->prev);
 389 }
 390
 391 static struct ipt_replace *
 392 iptables_blob(struct connman_iptables *table)
 393 {
 394         struct ipt_replace *r;
 395         GList *list;
 396         struct connman_iptables_entry *e;
 397         unsigned char *entry_index;
 398
 399         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 400         if (r == NULL)
 401                 return NULL;
 402
 403         memset(r, 0, sizeof(*r) + table->size);
 404
 405         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 406                                 * table->num_entries);
 407         if (r->counters == NULL) {
 408                 g_free(r);
 409                 return NULL;
 410         }
 411
 412         strcpy(r->name, table->info->name);
 413         r->num_entries = table->num_entries;
 414         r->size = table->size;
 415
 416         r->num_counters = table->old_entries;
 417         r->valid_hooks  = table->info->valid_hooks;
 418
 419         memcpy(r->hook_entry, table->info->hook_entry,
 420                                 sizeof(table->info->hook_entry));
 421         memcpy(r->underflow, table->info->underflow,
 422                                 sizeof(table->info->underflow));
 423
 424         entry_index = (unsigned char *)r->entries;
 425         for (list = table->entries; list; list = list->next) {
 426                 e = list->data;
 427
 428                 memcpy(entry_index, e->entry, e->entry->next_offset);
 429                 entry_index += e->entry->next_offset;
 430         }
 431
 432         return r;
 433 }
 434
 435 static void dump_target(struct connman_iptables *table,
 436                                 struct ipt_entry *entry)
 437
 438 {
 439         struct xtables_target *xt_t;
 440         struct xt_entry_target *target;
 441
 442         target = ipt_get_target(entry);
 443
 444         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 445                 struct xt_standard_target *t;
 446
 447                 t = (struct xt_standard_target *)target;
 448
 449                 switch (t->verdict) {
 450                 case XT_RETURN:
 451                         connman_info("\ttarget RETURN");
 452                         break;
 453
 454                 case -NF_ACCEPT - 1:
 455                         connman_info("\ttarget ACCEPT");
 456                         break;
 457
 458                 case -NF_DROP - 1:
 459                         connman_info("\ttarget DROP");
 460                         break;
 461
 462                 case -NF_QUEUE - 1:
 463                         connman_info("\ttarget QUEUE");
 464                         break;
 465
 466                 case -NF_STOP - 1:
 467                         connman_info("\ttarget STOP");
 468                         break;
 469
 470                 default:
 471                         connman_info("\tJUMP @%p (0x%x)",
 472                                 (char*)table->blob_entries->entrytable +
 473                                 t->verdict, t->verdict);
 474                         break;
 475                 }
 476
 477                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 478                                                 XTF_LOAD_MUST_SUCCEED);
 479
 480                 if(xt_t->print != NULL)
 481                         xt_t->print(NULL, target, 1);
 482         } else {
 483                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 484                 if (xt_t == NULL) {
 485                         connman_info("\ttarget %s", target->u.user.name);
 486                         return;
 487                 }
 488
 489                 if(xt_t->print != NULL) {
 490                         connman_info("\ttarget ");
 491                         xt_t->print(NULL, target, 1);
 492                 }
 493         }
 494 }
 495
 496 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 497 {
 498         struct xtables_match *xt_m;
 499         struct xt_entry_match *match;
 500
 501         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 502                 return;
 503
 504         match = (struct xt_entry_match *) entry->elems;
 505
 506         if (!strlen(match->u.user.name))
 507                 return;
 508
 509         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 510         if (xt_m == NULL)
 511                 goto out;
 512
 513         if(xt_m->print != NULL) {
 514                 connman_info("\tmatch ");
 515                 xt_m->print(NULL, match, 1);
 516
 517                 return;
 518         }
 519
 520 out:
 521         connman_info("\tmatch %s", match->u.user.name);
 522
 523 }
 524
 525 static int dump_entry(struct ipt_entry *entry,
 526                                 struct connman_iptables *table)
 527 {
 528         struct xt_entry_target *target;
 529         unsigned int offset;
 530         int builtin;
 531
 532         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 533         target = ipt_get_target(entry);
 534         builtin = is_hook_entry(table, entry);
 535
 536         if (entry_to_offset(table, entry) + entry->next_offset ==
 537                                         table->blob_entries->size) {
 538                 connman_info("End of CHAIN 0x%x", offset);
 539                 return 0;
 540         }
 541
 542         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 543                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
 544                         target->data, entry, entry->elems,
 545                         (char *)entry + entry->target_offset,
 546                                 entry->next_offset);
 547
 548                 return 0;
 549         } else if (builtin >= 0) {
 550                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
 551                         hooknames[builtin], entry, entry->elems,
 552                         (char *)entry + entry->target_offset,
 553                                 entry->next_offset);
 554         } else {
 555                 connman_info("RULE %p  match %p  target %p  size %d", entry,
 556                         entry->elems,
 557                         (char *)entry + entry->target_offset,
 558                                 entry->next_offset);
 559         }
 560
 561         dump_match(table, entry);
 562         dump_target(table, entry);
 563
 564         return 0;
 565 }
 566
 567 static void iptables_dump(struct connman_iptables *table)
 568 {
 569         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
 570                         table->info->name,
 571                         table->info->valid_hooks, table->info->num_entries,
 572                                 table->info->size);
 573
 574         ENTRY_ITERATE(table->blob_entries->entrytable,
 575                         table->blob_entries->size,
 576                         dump_entry, table);
 577
 578 }
 579
 580 static int iptables_get_entries(struct connman_iptables *table)
 581 {
 582         socklen_t entry_size;
 583
 584         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 585
 586         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 587                                 table->blob_entries, &entry_size);
 588 }
 589
 590 static int iptables_replace(struct connman_iptables *table,
 591                                         struct ipt_replace *r)
 592 {
 593         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 594                          sizeof(*r) + r->size);
 595 }
 596
 597 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 598 {
 599         struct ipt_entry *new_entry;
 600
 601         new_entry = g_try_malloc0(entry->next_offset);
 602         if (new_entry == NULL)
 603                 return -ENOMEM;
 604
 605         memcpy(new_entry, entry, entry->next_offset);
 606
 607         return iptables_add_entry(table, new_entry, NULL);
 608 }
 609
 610 static void table_cleanup(struct connman_iptables *table)
 611 {
 612         GList *list;
 613         struct connman_iptables_entry *entry;
 614
 615         close(table->ipt_sock);
 616
 617         for (list = table->entries; list; list = list->next) {
 618                 entry = list->data;
 619
 620                 g_free(entry->entry);
 621         }
 622
 623         g_list_free(table->entries);
 624         g_free(table->info);
 625         g_free(table->blob_entries);
 626         g_free(table);
 627 }
 628
 629 static struct connman_iptables *iptables_init(char *table_name)
 630 {
 631         struct connman_iptables *table;
 632         socklen_t s;
 633
 634         table = g_hash_table_lookup(table_hash, table_name);
 635         if (table != NULL)
 636                 return table;
 637
 638         table = g_try_new0(struct connman_iptables, 1);
 639         if (table == NULL)
 640                 return NULL;
 641
 642         table->info = g_try_new0(struct ipt_getinfo, 1);
 643         if (table->info == NULL)
 644                 goto err;
 645
 646         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 647         if (table->ipt_sock < 0)
 648                 goto err;
 649
 650         s = sizeof(*table->info);
 651         strcpy(table->info->name, table_name);
 652         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 653                                                 table->info, &s) < 0)
 654                 goto err;
 655
 656         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 657                                                 table->info->size);
 658         if (table->blob_entries == NULL)
 659                 goto err;
 660
 661         strcpy(table->blob_entries->name, table_name);
 662         table->blob_entries->size = table->info->size;
 663
 664         if (iptables_get_entries(table) < 0)
 665                 goto err;
 666
 667         table->num_entries = 0;
 668         table->old_entries = table->info->num_entries;
 669         table->size = 0;
 670
 671         ENTRY_ITERATE(table->blob_entries->entrytable,
 672                         table->blob_entries->size,
 673                                 add_entry, table);
 674
 675         g_hash_table_insert(table_hash, table_name, table);
 676
 677         return table;
 678
 679 err:
 680
 681         table_cleanup(table);
 682
 683         return NULL;
 684 }
 685
 686 static struct option iptables_opts[] = {
 687         {.name = "append",        .has_arg = 1, .val = 'A'},
 688         {.name = "list",          .has_arg = 2, .val = 'L'},
 689         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
 690         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
 691         {.name = "jump",          .has_arg = 1, .val = 'j'},
 692         {.name = "match",         .has_arg = 1, .val = 'm'},
 693         {.name = "out-interface", .has_arg = 1, .val = 'o'},
 694         {.name = "table",         .has_arg = 1, .val = 't'},
 695         {NULL},
 696 };
 697
 698 struct xtables_globals iptables_globals = {
 699         .option_offset = 0,
 700         .opts = iptables_opts,
 701         .orig_opts = iptables_opts,
 702 };
 703
 704 static int iptables_command(int argc, char *argv[])
 705 {
 706         struct connman_iptables *table;
 707         struct xtables_match *xt_m;
 708         struct xtables_target *xt_t;
 709         char *table_name, *chain, *new_chain, *match_name, *target_name;
 710         int c, ret;
 711         size_t size;
 712         gboolean dump, invert;
 713
 714         if (argc == 0)
 715                 return -EINVAL;
 716
 717         dump = FALSE;
 718         invert = FALSE;
 719         table_name = chain = new_chain = match_name = target_name = NULL;
 720         table = NULL;
 721         xt_m = NULL;
 722         xt_t = NULL;
 723         ret = 0;
 724
 725         optind = 0;
 726
 727         while ((c = getopt_long(argc, argv,
 728            "-A:L::N:j:i:m:o:t:", iptables_globals.opts, NULL)) != -1) {
 729                 switch (c) {
 730                 case 'A':
 731                         chain = optarg;
 732                         break;
 733
 734                 case 'L':
 735                         dump = TRUE;
 736                         break;
 737
 738                 case 'N':
 739                         new_chain = optarg;
 740                         break;
 741
 742                 case 'j':
 743                         target_name = optarg;
 744                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
 745
 746                         if (xt_t == NULL)
 747                                 break;
 748
 749                         size = ALIGN(sizeof(struct ipt_entry_target)) +
 750                                                                 xt_t->size;
 751
 752                         xt_t->t = g_try_malloc0(size);
 753                         if (xt_t->t == NULL)
 754                                 goto out;
 755                         xt_t->t->u.target_size = size;
 756                         strcpy(xt_t->t->u.user.name, target_name);
 757                         xt_t->t->u.user.revision = xt_t->revision;
 758                         if (xt_t->init != NULL)
 759                                 xt_t->init(xt_t->t);
 760                         iptables_globals.opts =
 761                                 xtables_merge_options(iptables_globals.opts,
 762                                                      xt_t->extra_opts,
 763                                                      &xt_t->option_offset);
 764                         if (iptables_globals.opts == NULL)
 765                                 goto out;
 766
 767                         break;
 768
 769                 case 'i':
 770                         break;
 771
 772                 case 'm':
 773                         match_name = optarg;
 774
 775                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
 776                         size = ALIGN(sizeof(struct ipt_entry_match)) +
 777                                                                 xt_m->size;
 778                         xt_m->m = g_try_malloc0(size);
 779                         if (xt_m == NULL)
 780                                 goto out;
 781                         xt_m->m->u.match_size = size;
 782                         strcpy(xt_m->m->u.user.name, xt_m->name);
 783                         xt_m->m->u.user.revision = xt_m->revision;
 784                         if (xt_m->init != NULL)
 785                                 xt_m->init(xt_m->m);
 786                         if (xt_m != xt_m->next) {
 787                                 iptables_globals.opts =
 788                                 xtables_merge_options(iptables_globals.opts,
 789                                                 xt_m->extra_opts,
 790                                                 &xt_m->option_offset);
 791                                 if (iptables_globals.opts == NULL)
 792                                         goto out;
 793                         }
 794
 795                         break;
 796
 797                 case 'o':
 798                         break;
 799
 800                 case 't':
 801                         table_name = optarg;
 802                         break;
 803
 804                 case 1:
 805                         if (optarg[0] == '!' && optarg[1] == '\0') {
 806                                 invert = TRUE;
 807                                 optarg[0] = '\0';
 808                                 continue;
 809                         }
 810
 811                         connman_error("Invalid option");
 812
 813                         ret = -EINVAL;
 814                         goto out;
 815
 816                 default:
 817                         if (xt_t == NULL || xt_t->parse == NULL ||
 818                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
 819                                         &xt_t->tflags, NULL, &xt_t->t)) {
 820                                 if (xt_m == NULL || xt_m->parse == NULL)
 821                                         break;
 822
 823                                 xt_m->parse(c - xt_m->option_offset, argv,
 824                                         invert, &xt_m->mflags, NULL, &xt_m->m);
 825                         }
 826
 827                         break;
 828                 }
 829         }
 830
 831         if (table_name == NULL)
 832                 table_name = "filter";
 833
 834         table = iptables_init(table_name);
 835         if (table == NULL) {
 836                 ret = -EINVAL;
 837                 goto out;
 838         }
 839
 840         if (dump) {
 841                 iptables_dump(table);
 842
 843                 ret = 0;
 844                 goto out;
 845         }
 846
 847         if (chain && new_chain) {
 848                 ret = -EINVAL;
 849                 goto out;
 850         }
 851
 852         if (new_chain) {
 853                 DBG("New chain %s", new_chain);
 854
 855                 ret = iptables_add_chain(table, new_chain);
 856                 goto out;
 857         }
 858
 859         if (chain) {
 860                 if (target_name == NULL)
 861                         return -1;
 862
 863                 DBG("Adding %s to %s (match %s)",
 864                                 target_name, chain, match_name);
 865
 866                 ret = iptables_add_rule(table, chain, target_name, xt_t,
 867                                         match_name, xt_m);
 868
 869                 goto out;
 870         }
 871
 872 out:
 873         if (xt_t)
 874                 g_free(xt_t->t);
 875
 876         if (xt_m)
 877                 g_free(xt_m->m);
 878
 879         return ret;
 880 }
 881
 882 int __connman_iptables_command(const char *format, ...)
 883 {
 884         char **argv, **arguments, *command;
 885         int argc, i, ret;
 886         va_list args;
 887
 888         if (format == NULL)
 889                 return -EINVAL;
 890
 891         va_start(args, format);
 892
 893         command = g_strdup_vprintf(format, args);
 894
 895         va_end(args);
 896
 897         if (command == NULL)
 898                 return -ENOMEM;
 899
 900         arguments = g_strsplit_set(command, " ", -1);
 901
 902         for (argc = 0; arguments[argc]; argc++);
 903
 904         DBG("command %s argc %d", command, ++argc);
 905
 906         argv = g_try_malloc0(argc * sizeof(char *));
 907         if (argv == NULL) {
 908                 g_free(command);
 909                 g_strfreev(arguments);
 910                 return -ENOMEM;
 911         }
 912
 913         argv[0] = "iptables";
 914         for (i = 1; i < argc; i++)
 915                 argv[i] = arguments[i - 1];
 916
 917         ret = iptables_command(argc, argv);
 918
 919         g_free(command);
 920         g_strfreev(arguments);
 921         g_free(argv);
 922
 923         return ret;
 924 }
 925
 926
 927 int __connman_iptables_commit(const char *table_name)
 928 {
 929         struct connman_iptables *table;
 930         struct ipt_replace *repl;
 931
 932         table = g_hash_table_lookup(table_hash, table_name);
 933         if (table == NULL)
 934                 return -EINVAL;
 935
 936         repl = iptables_blob(table);
 937
 938         return iptables_replace(table, repl);
 939 }
 940
 941 static void remove_table(gpointer user_data)
 942 {
 943         struct connman_iptables *table = user_data;
 944
 945         table_cleanup(table);
 946 }
 947
 948 int __connman_iptables_init(void)
 949 {
 950         DBG("");
 951
 952         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
 953                                                 NULL, remove_table);
 954
 955         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
 956
 957         return 0;
 958
 959 }
 960
 961 void __connman_iptables_cleanup(void)
 962 {
 963         g_hash_table_destroy(table_hash);
 964
 965         xtables_free_opts(1);
 966 }