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 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
 230 static void update_offsets(struct connman_iptables *table)
 231 {
 232         GList *list, *prev;
 233         struct connman_iptables_entry *entry, *prev_entry;
 234
 235         for (list = table->entries; list; list = list->next) {
 236                 entry = list->data;
 237
 238                 if (list == table->entries) {
 239                         entry->offset = 0;
 240
 241                         continue;
 242                 }
 243
 244                 prev = list->prev;
 245                 prev_entry = prev->data;
 246
 247                 entry->offset = prev_entry->offset +
 248                                         prev_entry->entry->next_offset;
 249         }
 250 }
 251
 252 static int iptables_add_entry(struct connman_iptables *table,
 253                                 struct ipt_entry *entry, GList *before)
 254 {
 255         struct connman_iptables_entry *e;
 256
 257         if (table == NULL)
 258                 return -1;
 259
 260         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 261         if (e == NULL)
 262                 return -1;
 263
 264         e->entry = entry;
 265
 266         table->entries = g_list_insert_before(table->entries, before, e);
 267         table->num_entries++;
 268         table->size += entry->next_offset;
 269
 270         update_offsets(table);
 271
 272         return 0;
 273 }
 274
 275 static int iptables_add_chain(struct connman_iptables *table,
 276                                         char *name)
 277 {
 278         GList *last;
 279         struct ipt_entry *entry_head;
 280         struct ipt_entry *entry_return;
 281         struct ipt_error_target *error;
 282         struct ipt_standard_target *standard;
 283         u_int16_t entry_head_size, entry_return_size;
 284
 285         last = g_list_last(table->entries);
 286
 287         /*
 288          * An empty chain is composed of:
 289          * - A head entry, with no match and an error target.
 290          *   The error target data is the chain name.
 291          * - A tail entry, with no match and a standard target.
 292          *   The standard target verdict is XT_RETURN (return to the
 293          *   caller).
 294          */
 295
 296         /* head entry */
 297         entry_head_size = sizeof(struct ipt_entry) +
 298                                 sizeof(struct ipt_error_target);
 299         entry_head = g_try_malloc0(entry_head_size);
 300         if (entry_head == NULL)
 301                 goto err;
 302
 303         memset(entry_head, 0, entry_head_size);
 304
 305         entry_head->target_offset = sizeof(struct ipt_entry);
 306         entry_head->next_offset = entry_head_size;
 307
 308         error = (struct ipt_error_target *) entry_head->elems;
 309         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 310         error->t.u.user.target_size = ALIGN(sizeof(struct ipt_error_target));
 311         strcpy(error->error, name);
 312
 313         if (iptables_add_entry(table, entry_head, last) < 0)
 314                 goto err;
 315
 316         /* tail entry */
 317         entry_return_size = sizeof(struct ipt_entry) +
 318                                 sizeof(struct ipt_standard_target);
 319         entry_return = g_try_malloc0(entry_return_size);
 320         if (entry_return == NULL)
 321                 goto err;
 322
 323         memset(entry_return, 0, entry_return_size);
 324
 325         entry_return->target_offset = sizeof(struct ipt_entry);
 326         entry_return->next_offset = entry_return_size;
 327
 328         standard = (struct ipt_standard_target *) entry_return->elems;
 329         standard->target.u.user.target_size =
 330                                 ALIGN(sizeof(struct ipt_standard_target));
 331         standard->verdict = XT_RETURN;
 332
 333         if (iptables_add_entry(table, entry_return, last) < 0)
 334                 goto err;
 335
 336         return 0;
 337
 338 err:
 339         g_free(entry_head);
 340         g_free(entry_return);
 341
 342         return -ENOMEM;
 343 }
 344
 345 static struct ipt_entry *
 346 new_rule(char *target_name, struct xtables_target *xt_t,
 347                 char *match_name, struct xtables_match *xt_m)
 348 {
 349         struct ipt_entry *new_entry;
 350         size_t match_size, target_size;
 351         int is_builtin = is_builtin_target(target_name);
 352
 353         if (xt_m)
 354                 match_size = xt_m->m->u.match_size;
 355         else
 356                 match_size = 0;
 357
 358         if (xt_t)
 359                 target_size = ALIGN(xt_t->t->u.target_size);
 360         else
 361                 target_size = 0;
 362
 363         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 364                                                                 match_size);
 365         if (new_entry == NULL)
 366                 return NULL;
 367
 368         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 369         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 370                                                                 match_size;
 371         if (xt_m) {
 372                 struct xt_entry_match *entry_match;
 373
 374                 entry_match = (struct xt_entry_match *)new_entry->elems;
 375                 memcpy(entry_match, xt_m->m, match_size);
 376         }
 377
 378         if (xt_t) {
 379                 struct xt_entry_target *entry_target;
 380
 381                 if (is_builtin) {
 382                         struct xt_standard_target *target;
 383
 384                         target = (struct xt_standard_target *)(xt_t->t);
 385                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 386                         target->verdict = target_to_verdict(target_name);
 387                 }
 388
 389                 entry_target = ipt_get_target(new_entry);
 390                 memcpy(entry_target, xt_t->t, target_size);
 391         }
 392
 393         return new_entry;
 394 }
 395
 396 static int
 397 iptables_add_rule(struct connman_iptables *table, char *chain_name,
 398                                 char *target_name, struct xtables_target *xt_t,
 399                                 char *match_name, struct xtables_match *xt_m)
 400 {
 401         GList *chain_tail;
 402         struct ipt_entry *new_entry;
 403
 404         chain_tail = find_chain_tail(table, chain_name);
 405         if (chain_tail == NULL)
 406                 return -EINVAL;
 407
 408         new_entry = new_rule(target_name, xt_t,
 409                                 match_name, xt_m);
 410         if (new_entry == NULL)
 411                 return -EINVAL;
 412
 413         return iptables_add_entry(table, new_entry, chain_tail->prev);
 414 }
 415
 416 static struct ipt_replace *
 417 iptables_blob(struct connman_iptables *table)
 418 {
 419         struct ipt_replace *r;
 420         GList *list;
 421         struct connman_iptables_entry *e;
 422         unsigned char *entry_index;
 423
 424         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 425         if (r == NULL)
 426                 return NULL;
 427
 428         memset(r, 0, sizeof(*r) + table->size);
 429
 430         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 431                                 * table->num_entries);
 432         if (r->counters == NULL) {
 433                 g_free(r);
 434                 return NULL;
 435         }
 436
 437         strcpy(r->name, table->info->name);
 438         r->num_entries = table->num_entries;
 439         r->size = table->size;
 440
 441         r->num_counters = table->old_entries;
 442         r->valid_hooks  = table->info->valid_hooks;
 443
 444         memcpy(r->hook_entry, table->info->hook_entry,
 445                                 sizeof(table->info->hook_entry));
 446         memcpy(r->underflow, table->info->underflow,
 447                                 sizeof(table->info->underflow));
 448
 449         entry_index = (unsigned char *)r->entries;
 450         for (list = table->entries; list; list = list->next) {
 451                 e = list->data;
 452
 453                 memcpy(entry_index, e->entry, e->entry->next_offset);
 454                 entry_index += e->entry->next_offset;
 455         }
 456
 457         return r;
 458 }
 459
 460 static void dump_target(struct connman_iptables *table,
 461                                 struct ipt_entry *entry)
 462
 463 {
 464         struct xtables_target *xt_t;
 465         struct xt_entry_target *target;
 466
 467         target = ipt_get_target(entry);
 468
 469         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 470                 struct xt_standard_target *t;
 471
 472                 t = (struct xt_standard_target *)target;
 473
 474                 switch (t->verdict) {
 475                 case XT_RETURN:
 476                         connman_info("\ttarget RETURN");
 477                         break;
 478
 479                 case -NF_ACCEPT - 1:
 480                         connman_info("\ttarget ACCEPT");
 481                         break;
 482
 483                 case -NF_DROP - 1:
 484                         connman_info("\ttarget DROP");
 485                         break;
 486
 487                 case -NF_QUEUE - 1:
 488                         connman_info("\ttarget QUEUE");
 489                         break;
 490
 491                 case -NF_STOP - 1:
 492                         connman_info("\ttarget STOP");
 493                         break;
 494
 495                 default:
 496                         connman_info("\tJUMP @%p (0x%x)",
 497                                 (char*)table->blob_entries->entrytable +
 498                                 t->verdict, t->verdict);
 499                         break;
 500                 }
 501
 502                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 503                                                 XTF_LOAD_MUST_SUCCEED);
 504
 505                 if(xt_t->print != NULL)
 506                         xt_t->print(NULL, target, 1);
 507         } else {
 508                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 509                 if (xt_t == NULL) {
 510                         connman_info("\ttarget %s", target->u.user.name);
 511                         return;
 512                 }
 513
 514                 if(xt_t->print != NULL) {
 515                         connman_info("\ttarget ");
 516                         xt_t->print(NULL, target, 1);
 517                 }
 518         }
 519 }
 520
 521 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 522 {
 523         struct xtables_match *xt_m;
 524         struct xt_entry_match *match;
 525
 526         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 527                 return;
 528
 529         match = (struct xt_entry_match *) entry->elems;
 530
 531         if (!strlen(match->u.user.name))
 532                 return;
 533
 534         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 535         if (xt_m == NULL)
 536                 goto out;
 537
 538         if(xt_m->print != NULL) {
 539                 connman_info("\tmatch ");
 540                 xt_m->print(NULL, match, 1);
 541
 542                 return;
 543         }
 544
 545 out:
 546         connman_info("\tmatch %s", match->u.user.name);
 547
 548 }
 549
 550 static int dump_entry(struct ipt_entry *entry,
 551                                 struct connman_iptables *table)
 552 {
 553         struct xt_entry_target *target;
 554         unsigned int offset;
 555         int builtin;
 556
 557         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 558         target = ipt_get_target(entry);
 559         builtin = is_hook_entry(table, entry);
 560
 561         if (entry_to_offset(table, entry) + entry->next_offset ==
 562                                         table->blob_entries->size) {
 563                 connman_info("End of CHAIN 0x%x", offset);
 564                 return 0;
 565         }
 566
 567         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 568                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
 569                         target->data, entry, entry->elems,
 570                         (char *)entry + entry->target_offset,
 571                                 entry->next_offset);
 572
 573                 return 0;
 574         } else if (builtin >= 0) {
 575                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
 576                         hooknames[builtin], entry, entry->elems,
 577                         (char *)entry + entry->target_offset,
 578                                 entry->next_offset);
 579         } else {
 580                 connman_info("RULE %p  match %p  target %p  size %d", entry,
 581                         entry->elems,
 582                         (char *)entry + entry->target_offset,
 583                                 entry->next_offset);
 584         }
 585
 586         dump_match(table, entry);
 587         dump_target(table, entry);
 588
 589         return 0;
 590 }
 591
 592 static void iptables_dump(struct connman_iptables *table)
 593 {
 594         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
 595                         table->info->name,
 596                         table->info->valid_hooks, table->info->num_entries,
 597                                 table->info->size);
 598
 599         ENTRY_ITERATE(table->blob_entries->entrytable,
 600                         table->blob_entries->size,
 601                         dump_entry, table);
 602
 603 }
 604
 605 static int iptables_get_entries(struct connman_iptables *table)
 606 {
 607         socklen_t entry_size;
 608
 609         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 610
 611         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 612                                 table->blob_entries, &entry_size);
 613 }
 614
 615 static int iptables_replace(struct connman_iptables *table,
 616                                         struct ipt_replace *r)
 617 {
 618         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 619                          sizeof(*r) + r->size);
 620 }
 621
 622 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 623 {
 624         struct ipt_entry *new_entry;
 625
 626         new_entry = g_try_malloc0(entry->next_offset);
 627         if (new_entry == NULL)
 628                 return -ENOMEM;
 629
 630         memcpy(new_entry, entry, entry->next_offset);
 631
 632         return iptables_add_entry(table, new_entry, NULL);
 633 }
 634
 635 static void table_cleanup(struct connman_iptables *table)
 636 {
 637         GList *list;
 638         struct connman_iptables_entry *entry;
 639
 640         close(table->ipt_sock);
 641
 642         for (list = table->entries; list; list = list->next) {
 643                 entry = list->data;
 644
 645                 g_free(entry->entry);
 646         }
 647
 648         g_list_free(table->entries);
 649         g_free(table->info);
 650         g_free(table->blob_entries);
 651         g_free(table);
 652 }
 653
 654 static struct connman_iptables *iptables_init(char *table_name)
 655 {
 656         struct connman_iptables *table;
 657         socklen_t s;
 658
 659         table = g_hash_table_lookup(table_hash, table_name);
 660         if (table != NULL)
 661                 return table;
 662
 663         table = g_try_new0(struct connman_iptables, 1);
 664         if (table == NULL)
 665                 return NULL;
 666
 667         table->info = g_try_new0(struct ipt_getinfo, 1);
 668         if (table->info == NULL)
 669                 goto err;
 670
 671         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 672         if (table->ipt_sock < 0)
 673                 goto err;
 674
 675         s = sizeof(*table->info);
 676         strcpy(table->info->name, table_name);
 677         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 678                                                 table->info, &s) < 0)
 679                 goto err;
 680
 681         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 682                                                 table->info->size);
 683         if (table->blob_entries == NULL)
 684                 goto err;
 685
 686         strcpy(table->blob_entries->name, table_name);
 687         table->blob_entries->size = table->info->size;
 688
 689         if (iptables_get_entries(table) < 0)
 690                 goto err;
 691
 692         table->num_entries = 0;
 693         table->old_entries = table->info->num_entries;
 694         table->size = 0;
 695
 696         ENTRY_ITERATE(table->blob_entries->entrytable,
 697                         table->blob_entries->size,
 698                                 add_entry, table);
 699
 700         g_hash_table_insert(table_hash, table_name, table);
 701
 702         return table;
 703
 704 err:
 705
 706         table_cleanup(table);
 707
 708         return NULL;
 709 }
 710
 711 static struct option iptables_opts[] = {
 712         {.name = "append",        .has_arg = 1, .val = 'A'},
 713         {.name = "list",          .has_arg = 2, .val = 'L'},
 714         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
 715         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
 716         {.name = "jump",          .has_arg = 1, .val = 'j'},
 717         {.name = "match",         .has_arg = 1, .val = 'm'},
 718         {.name = "out-interface", .has_arg = 1, .val = 'o'},
 719         {.name = "table",         .has_arg = 1, .val = 't'},
 720         {NULL},
 721 };
 722
 723 struct xtables_globals iptables_globals = {
 724         .option_offset = 0,
 725         .opts = iptables_opts,
 726         .orig_opts = iptables_opts,
 727 };
 728
 729 static int iptables_command(int argc, char *argv[])
 730 {
 731         struct connman_iptables *table;
 732         struct xtables_match *xt_m;
 733         struct xtables_target *xt_t;
 734         char *table_name, *chain, *new_chain, *match_name, *target_name;
 735         int c, ret;
 736         size_t size;
 737         gboolean dump, invert;
 738
 739         if (argc == 0)
 740                 return -EINVAL;
 741
 742         dump = FALSE;
 743         invert = FALSE;
 744         table_name = chain = new_chain = match_name = target_name = NULL;
 745         table = NULL;
 746         xt_m = NULL;
 747         xt_t = NULL;
 748         ret = 0;
 749
 750         optind = 0;
 751
 752         while ((c = getopt_long(argc, argv,
 753            "-A:L::N:j:i:m:o:t:", iptables_globals.opts, NULL)) != -1) {
 754                 switch (c) {
 755                 case 'A':
 756                         chain = optarg;
 757                         break;
 758
 759                 case 'L':
 760                         dump = TRUE;
 761                         break;
 762
 763                 case 'N':
 764                         new_chain = optarg;
 765                         break;
 766
 767                 case 'j':
 768                         target_name = optarg;
 769                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
 770
 771                         if (xt_t == NULL)
 772                                 break;
 773
 774                         size = ALIGN(sizeof(struct ipt_entry_target)) +
 775                                                                 xt_t->size;
 776
 777                         xt_t->t = g_try_malloc0(size);
 778                         if (xt_t->t == NULL)
 779                                 goto out;
 780                         xt_t->t->u.target_size = size;
 781                         strcpy(xt_t->t->u.user.name, target_name);
 782                         xt_t->t->u.user.revision = xt_t->revision;
 783                         if (xt_t->init != NULL)
 784                                 xt_t->init(xt_t->t);
 785                         iptables_globals.opts =
 786                                 xtables_merge_options(iptables_globals.opts,
 787                                                      xt_t->extra_opts,
 788                                                      &xt_t->option_offset);
 789                         if (iptables_globals.opts == NULL)
 790                                 goto out;
 791
 792                         break;
 793
 794                 case 'i':
 795                         break;
 796
 797                 case 'm':
 798                         match_name = optarg;
 799
 800                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
 801                         size = ALIGN(sizeof(struct ipt_entry_match)) +
 802                                                                 xt_m->size;
 803                         xt_m->m = g_try_malloc0(size);
 804                         if (xt_m == NULL)
 805                                 goto out;
 806                         xt_m->m->u.match_size = size;
 807                         strcpy(xt_m->m->u.user.name, xt_m->name);
 808                         xt_m->m->u.user.revision = xt_m->revision;
 809                         if (xt_m->init != NULL)
 810                                 xt_m->init(xt_m->m);
 811                         if (xt_m != xt_m->next) {
 812                                 iptables_globals.opts =
 813                                 xtables_merge_options(iptables_globals.opts,
 814                                                 xt_m->extra_opts,
 815                                                 &xt_m->option_offset);
 816                                 if (iptables_globals.opts == NULL)
 817                                         goto out;
 818                         }
 819
 820                         break;
 821
 822                 case 'o':
 823                         break;
 824
 825                 case 't':
 826                         table_name = optarg;
 827                         break;
 828
 829                 case 1:
 830                         if (optarg[0] == '!' && optarg[1] == '\0') {
 831                                 invert = TRUE;
 832                                 optarg[0] = '\0';
 833                                 continue;
 834                         }
 835
 836                         connman_error("Invalid option");
 837
 838                         ret = -EINVAL;
 839                         goto out;
 840
 841                 default:
 842                         if (xt_t == NULL || xt_t->parse == NULL ||
 843                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
 844                                         &xt_t->tflags, NULL, &xt_t->t)) {
 845                                 if (xt_m == NULL || xt_m->parse == NULL)
 846                                         break;
 847
 848                                 xt_m->parse(c - xt_m->option_offset, argv,
 849                                         invert, &xt_m->mflags, NULL, &xt_m->m);
 850                         }
 851
 852                         break;
 853                 }
 854         }
 855
 856         if (table_name == NULL)
 857                 table_name = "filter";
 858
 859         table = iptables_init(table_name);
 860         if (table == NULL) {
 861                 ret = -EINVAL;
 862                 goto out;
 863         }
 864
 865         if (dump) {
 866                 iptables_dump(table);
 867
 868                 ret = 0;
 869                 goto out;
 870         }
 871
 872         if (chain && new_chain) {
 873                 ret = -EINVAL;
 874                 goto out;
 875         }
 876
 877         if (new_chain) {
 878                 DBG("New chain %s", new_chain);
 879
 880                 ret = iptables_add_chain(table, new_chain);
 881                 goto out;
 882         }
 883
 884         if (chain) {
 885                 if (target_name == NULL)
 886                         return -1;
 887
 888                 DBG("Adding %s to %s (match %s)",
 889                                 target_name, chain, match_name);
 890
 891                 ret = iptables_add_rule(table, chain, target_name, xt_t,
 892                                         match_name, xt_m);
 893
 894                 goto out;
 895         }
 896
 897 out:
 898         if (xt_t)
 899                 g_free(xt_t->t);
 900
 901         if (xt_m)
 902                 g_free(xt_m->m);
 903
 904         return ret;
 905 }
 906
 907 int __connman_iptables_command(const char *format, ...)
 908 {
 909         char **argv, **arguments, *command;
 910         int argc, i, ret;
 911         va_list args;
 912
 913         if (format == NULL)
 914                 return -EINVAL;
 915
 916         va_start(args, format);
 917
 918         command = g_strdup_vprintf(format, args);
 919
 920         va_end(args);
 921
 922         if (command == NULL)
 923                 return -ENOMEM;
 924
 925         arguments = g_strsplit_set(command, " ", -1);
 926
 927         for (argc = 0; arguments[argc]; argc++);
 928
 929         DBG("command %s argc %d", command, ++argc);
 930
 931         argv = g_try_malloc0(argc * sizeof(char *));
 932         if (argv == NULL) {
 933                 g_free(command);
 934                 g_strfreev(arguments);
 935                 return -ENOMEM;
 936         }
 937
 938         argv[0] = "iptables";
 939         for (i = 1; i < argc; i++)
 940                 argv[i] = arguments[i - 1];
 941
 942         ret = iptables_command(argc, argv);
 943
 944         g_free(command);
 945         g_strfreev(arguments);
 946         g_free(argv);
 947
 948         return ret;
 949 }
 950
 951
 952 int __connman_iptables_commit(const char *table_name)
 953 {
 954         struct connman_iptables *table;
 955         struct ipt_replace *repl;
 956
 957         table = g_hash_table_lookup(table_hash, table_name);
 958         if (table == NULL)
 959                 return -EINVAL;
 960
 961         repl = iptables_blob(table);
 962
 963         return iptables_replace(table, repl);
 964 }
 965
 966 static void remove_table(gpointer user_data)
 967 {
 968         struct connman_iptables *table = user_data;
 969
 970         table_cleanup(table);
 971 }
 972
 973 int __connman_iptables_init(void)
 974 {
 975         DBG("");
 976
 977         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
 978                                                 NULL, remove_table);
 979
 980         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
 981
 982         return 0;
 983
 984 }
 985
 986 void __connman_iptables_cleanup(void)
 987 {
 988         g_hash_table_destroy(table_hash);
 989
 990         xtables_free_opts(1);
 991 }