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_builtin_rule(char *target_name, struct xtables_match *xt_m)
 322 {
 323         struct ipt_entry *entry;
 324         size_t match_size, target_size;
 325         struct xt_entry_match *entry_match;
 326         struct xt_standard_target *target;
 327
 328         if (xt_m)
 329                 match_size = xt_m->m->u.match_size;
 330         else
 331                 match_size = 0;
 332
 333         target_size = ALIGN(sizeof(struct xt_standard_target));
 334
 335         entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 336                                                                 match_size);
 337         if (entry == NULL)
 338                 return NULL;
 339
 340         entry->target_offset = sizeof(struct ipt_entry) + match_size;
 341         entry->next_offset = sizeof(struct ipt_entry) + target_size +
 342                                                                 match_size;
 343         if (xt_m) {
 344                 entry_match = (struct xt_entry_match *)entry->elems;
 345                 memcpy(entry_match, xt_m->m, match_size);
 346         }
 347
 348         target = (struct xt_standard_target *)ipt_get_target(entry);
 349         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 350         target->target.u.user.target_size =
 351                                 ALIGN(sizeof(struct ipt_standard_target));
 352         target->verdict = target_to_verdict(target_name);
 353
 354         return entry;
 355 }
 356
 357 static struct ipt_entry *
 358 new_custom_rule(struct xtables_target *xt_t, struct xtables_match *xt_m)
 359 {
 360         struct ipt_entry *entry;
 361         size_t match_size, target_size;
 362         struct xt_entry_match *entry_match;
 363         struct xt_entry_target *entry_target;
 364
 365         if (xt_m)
 366                 match_size = xt_m->m->u.match_size;
 367         else
 368                 match_size = 0;
 369
 370         if (xt_t)
 371                 target_size = ALIGN(xt_t->t->u.target_size);
 372         else
 373                 target_size = 0;
 374
 375         entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 376                                                                 match_size);
 377         if (entry == NULL)
 378                 return NULL;
 379
 380         entry->target_offset = sizeof(struct ipt_entry) + match_size;
 381         entry->next_offset = sizeof(struct ipt_entry) + target_size +
 382                                                                 match_size;
 383         if (xt_m) {
 384                 entry_match = (struct xt_entry_match *)entry->elems;
 385                 memcpy(entry_match, xt_m->m, match_size);
 386         }
 387
 388         if (xt_t) {
 389                 entry_target = ipt_get_target(entry);
 390                 memcpy(entry_target, xt_t->t, target_size);
 391         }
 392
 393         return entry;
 394 }
 395
 396 static struct ipt_entry *
 397 new_rule(char *target_name, struct xtables_target *xt_t,
 398                 char *match_name, struct xtables_match *xt_m)
 399 {
 400         struct ipt_entry *new_entry;
 401
 402         if (is_builtin_target(target_name))
 403                 new_entry = new_builtin_rule(target_name, xt_m);
 404         else
 405                 new_entry = new_custom_rule(xt_t, xt_m);
 406
 407         return new_entry;
 408 }
 409
 410 static int
 411 iptables_add_rule(struct connman_iptables *table, char *chain_name,
 412                                 char *target_name, struct xtables_target *xt_t,
 413                                 char *match_name, struct xtables_match *xt_m)
 414 {
 415         GList *chain_tail;
 416         struct ipt_entry *new_entry;
 417
 418         chain_tail = find_chain_tail(table, chain_name);
 419         if (chain_tail == NULL)
 420                 return -EINVAL;
 421
 422         new_entry = new_rule(target_name, xt_t,
 423                                 match_name, xt_m);
 424         if (new_entry == NULL)
 425                 return -EINVAL;
 426
 427         return iptables_add_entry(table, new_entry, chain_tail->prev);
 428 }
 429
 430 static struct ipt_replace *
 431 iptables_blob(struct connman_iptables *table)
 432 {
 433         struct ipt_replace *r;
 434         GList *list;
 435         struct connman_iptables_entry *e;
 436         unsigned char *entry_index;
 437
 438         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 439         if (r == NULL)
 440                 return NULL;
 441
 442         memset(r, 0, sizeof(*r) + table->size);
 443
 444         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 445                                 * table->num_entries);
 446         if (r->counters == NULL) {
 447                 g_free(r);
 448                 return NULL;
 449         }
 450
 451         strcpy(r->name, table->info->name);
 452         r->num_entries = table->num_entries;
 453         r->size = table->size;
 454
 455         r->num_counters = table->old_entries;
 456         r->valid_hooks  = table->info->valid_hooks;
 457
 458         memcpy(r->hook_entry, table->info->hook_entry,
 459                                 sizeof(table->info->hook_entry));
 460         memcpy(r->underflow, table->info->underflow,
 461                                 sizeof(table->info->underflow));
 462
 463         entry_index = (unsigned char *)r->entries;
 464         for (list = table->entries; list; list = list->next) {
 465                 e = list->data;
 466
 467                 memcpy(entry_index, e->entry, e->entry->next_offset);
 468                 entry_index += e->entry->next_offset;
 469         }
 470
 471         return r;
 472 }
 473
 474 static void dump_target(struct connman_iptables *table,
 475                                 struct ipt_entry *entry)
 476
 477 {
 478         struct xtables_target *xt_t;
 479         struct xt_entry_target *target;
 480
 481         target = ipt_get_target(entry);
 482
 483         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 484                 struct xt_standard_target *t;
 485
 486                 t = (struct xt_standard_target *)target;
 487
 488                 switch (t->verdict) {
 489                 case XT_RETURN:
 490                         connman_info("\ttarget RETURN");
 491                         break;
 492
 493                 case -NF_ACCEPT - 1:
 494                         connman_info("\ttarget ACCEPT");
 495                         break;
 496
 497                 case -NF_DROP - 1:
 498                         connman_info("\ttarget DROP");
 499                         break;
 500
 501                 case -NF_QUEUE - 1:
 502                         connman_info("\ttarget QUEUE");
 503                         break;
 504
 505                 case -NF_STOP - 1:
 506                         connman_info("\ttarget STOP");
 507                         break;
 508
 509                 default:
 510                         connman_info("\tJUMP @%p (0x%x)",
 511                                 (char*)table->blob_entries->entrytable +
 512                                 t->verdict, t->verdict);
 513                         break;
 514                 }
 515
 516                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 517                                                 XTF_LOAD_MUST_SUCCEED);
 518
 519                 if(xt_t->print != NULL)
 520                         xt_t->print(NULL, target, 1);
 521         } else {
 522                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 523                 if (xt_t == NULL) {
 524                         connman_info("\ttarget %s", target->u.user.name);
 525                         return;
 526                 }
 527
 528                 if(xt_t->print != NULL) {
 529                         connman_info("\ttarget ");
 530                         xt_t->print(NULL, target, 1);
 531                 }
 532         }
 533 }
 534
 535 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 536 {
 537         struct xtables_match *xt_m;
 538         struct xt_entry_match *match;
 539
 540         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 541                 return;
 542
 543         match = (struct xt_entry_match *) entry->elems;
 544
 545         if (!strlen(match->u.user.name))
 546                 return;
 547
 548         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 549         if (xt_m == NULL)
 550                 goto out;
 551
 552         if(xt_m->print != NULL) {
 553                 connman_info("\tmatch ");
 554                 xt_m->print(NULL, match, 1);
 555
 556                 return;
 557         }
 558
 559 out:
 560         connman_info("\tmatch %s", match->u.user.name);
 561
 562 }
 563
 564 static int dump_entry(struct ipt_entry *entry,
 565                                 struct connman_iptables *table)
 566 {
 567         struct xt_entry_target *target;
 568         unsigned int offset;
 569         int builtin;
 570
 571         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 572         target = ipt_get_target(entry);
 573         builtin = is_hook_entry(table, entry);
 574
 575         if (entry_to_offset(table, entry) + entry->next_offset ==
 576                                         table->blob_entries->size) {
 577                 connman_info("End of CHAIN 0x%x", offset);
 578                 return 0;
 579         }
 580
 581         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 582                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
 583                         target->data, entry, entry->elems,
 584                         (char *)entry + entry->target_offset,
 585                                 entry->next_offset);
 586
 587                 return 0;
 588         } else if (builtin >= 0) {
 589                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
 590                         hooknames[builtin], entry, entry->elems,
 591                         (char *)entry + entry->target_offset,
 592                                 entry->next_offset);
 593         } else {
 594                 connman_info("RULE %p  match %p  target %p  size %d", entry,
 595                         entry->elems,
 596                         (char *)entry + entry->target_offset,
 597                                 entry->next_offset);
 598         }
 599
 600         dump_match(table, entry);
 601         dump_target(table, entry);
 602
 603         return 0;
 604 }
 605
 606 static void iptables_dump(struct connman_iptables *table)
 607 {
 608         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
 609                         table->info->name,
 610                         table->info->valid_hooks, table->info->num_entries,
 611                                 table->info->size);
 612
 613         ENTRY_ITERATE(table->blob_entries->entrytable,
 614                         table->blob_entries->size,
 615                         dump_entry, table);
 616
 617 }
 618
 619 static int iptables_get_entries(struct connman_iptables *table)
 620 {
 621         socklen_t entry_size;
 622
 623         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 624
 625         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 626                                 table->blob_entries, &entry_size);
 627 }
 628
 629 static int iptables_replace(struct connman_iptables *table,
 630                                         struct ipt_replace *r)
 631 {
 632         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 633                          sizeof(*r) + r->size);
 634 }
 635
 636 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 637 {
 638         struct ipt_entry *new_entry;
 639
 640         new_entry = g_try_malloc0(entry->next_offset);
 641         if (new_entry == NULL)
 642                 return -ENOMEM;
 643
 644         memcpy(new_entry, entry, entry->next_offset);
 645
 646         return iptables_add_entry(table, new_entry, NULL);
 647 }
 648
 649 static void table_cleanup(struct connman_iptables *table)
 650 {
 651         GList *list;
 652         struct connman_iptables_entry *entry;
 653
 654         close(table->ipt_sock);
 655
 656         for (list = table->entries; list; list = list->next) {
 657                 entry = list->data;
 658
 659                 g_free(entry->entry);
 660         }
 661
 662         g_list_free(table->entries);
 663         g_free(table->info);
 664         g_free(table->blob_entries);
 665         g_free(table);
 666 }
 667
 668 static struct connman_iptables *iptables_init(char *table_name)
 669 {
 670         struct connman_iptables *table;
 671         socklen_t s;
 672
 673         table = g_hash_table_lookup(table_hash, table_name);
 674         if (table != NULL)
 675                 return table;
 676
 677         table = g_try_new0(struct connman_iptables, 1);
 678         if (table == NULL)
 679                 return NULL;
 680
 681         table->info = g_try_new0(struct ipt_getinfo, 1);
 682         if (table->info == NULL)
 683                 goto err;
 684
 685         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 686         if (table->ipt_sock < 0)
 687                 goto err;
 688
 689         s = sizeof(*table->info);
 690         strcpy(table->info->name, table_name);
 691         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 692                                                 table->info, &s) < 0)
 693                 goto err;
 694
 695         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 696                                                 table->info->size);
 697         if (table->blob_entries == NULL)
 698                 goto err;
 699
 700         strcpy(table->blob_entries->name, table_name);
 701         table->blob_entries->size = table->info->size;
 702
 703         if (iptables_get_entries(table) < 0)
 704                 goto err;
 705
 706         table->num_entries = 0;
 707         table->old_entries = table->info->num_entries;
 708         table->size = 0;
 709
 710         ENTRY_ITERATE(table->blob_entries->entrytable,
 711                         table->blob_entries->size,
 712                                 add_entry, table);
 713
 714         g_hash_table_insert(table_hash, table_name, table);
 715
 716         return table;
 717
 718 err:
 719
 720         table_cleanup(table);
 721
 722         return NULL;
 723 }
 724
 725 static struct option iptables_opts[] = {
 726         {.name = "append",        .has_arg = 1, .val = 'A'},
 727         {.name = "list",          .has_arg = 2, .val = 'L'},
 728         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
 729         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
 730         {.name = "jump",          .has_arg = 1, .val = 'j'},
 731         {.name = "match",         .has_arg = 1, .val = 'm'},
 732         {.name = "out-interface", .has_arg = 1, .val = 'o'},
 733         {.name = "table",         .has_arg = 1, .val = 't'},
 734         {NULL},
 735 };
 736
 737 struct xtables_globals iptables_globals = {
 738         .option_offset = 0,
 739         .opts = iptables_opts,
 740         .orig_opts = iptables_opts,
 741 };
 742
 743 static int iptables_command(int argc, char *argv[])
 744 {
 745         struct connman_iptables *table;
 746         struct xtables_match *xt_m;
 747         struct xtables_target *xt_t;
 748         char *table_name, *chain, *new_chain, *match_name, *target_name;
 749         int c, ret;
 750         size_t size;
 751         gboolean dump, invert;
 752
 753         if (argc == 0)
 754                 return -EINVAL;
 755
 756         dump = FALSE;
 757         invert = FALSE;
 758         table_name = chain = new_chain = match_name = target_name = NULL;
 759         table = NULL;
 760         xt_m = NULL;
 761         xt_t = NULL;
 762         ret = 0;
 763
 764         optind = 0;
 765
 766         while ((c = getopt_long(argc, argv,
 767            "-A:L::N:j:i:m:o:t:", iptables_globals.opts, NULL)) != -1) {
 768                 switch (c) {
 769                 case 'A':
 770                         chain = optarg;
 771                         break;
 772
 773                 case 'L':
 774                         dump = TRUE;
 775                         break;
 776
 777                 case 'N':
 778                         new_chain = optarg;
 779                         break;
 780
 781                 case 'j':
 782                         target_name = optarg;
 783                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
 784
 785                         if (xt_t == NULL)
 786                                 break;
 787
 788                         size = ALIGN(sizeof(struct ipt_entry_target)) +
 789                                                                 xt_t->size;
 790
 791                         xt_t->t = g_try_malloc0(size);
 792                         if (xt_t->t == NULL)
 793                                 goto out;
 794                         xt_t->t->u.target_size = size;
 795                         strcpy(xt_t->t->u.user.name, target_name);
 796                         xt_t->t->u.user.revision = xt_t->revision;
 797                         if (xt_t->init != NULL)
 798                                 xt_t->init(xt_t->t);
 799                         iptables_globals.opts =
 800                                 xtables_merge_options(iptables_globals.opts,
 801                                                      xt_t->extra_opts,
 802                                                      &xt_t->option_offset);
 803                         if (iptables_globals.opts == NULL)
 804                                 goto out;
 805
 806                         break;
 807
 808                 case 'i':
 809                         break;
 810
 811                 case 'm':
 812                         match_name = optarg;
 813
 814                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
 815                         size = ALIGN(sizeof(struct ipt_entry_match)) +
 816                                                                 xt_m->size;
 817                         xt_m->m = g_try_malloc0(size);
 818                         if (xt_m == NULL)
 819                                 goto out;
 820                         xt_m->m->u.match_size = size;
 821                         strcpy(xt_m->m->u.user.name, xt_m->name);
 822                         xt_m->m->u.user.revision = xt_m->revision;
 823                         if (xt_m->init != NULL)
 824                                 xt_m->init(xt_m->m);
 825                         if (xt_m != xt_m->next) {
 826                                 iptables_globals.opts =
 827                                 xtables_merge_options(iptables_globals.opts,
 828                                                 xt_m->extra_opts,
 829                                                 &xt_m->option_offset);
 830                                 if (iptables_globals.opts == NULL)
 831                                         goto out;
 832                         }
 833
 834                         break;
 835
 836                 case 'o':
 837                         break;
 838
 839                 case 't':
 840                         table_name = optarg;
 841                         break;
 842
 843                 case 1:
 844                         if (optarg[0] == '!' && optarg[1] == '\0') {
 845                                 invert = TRUE;
 846                                 optarg[0] = '\0';
 847                                 continue;
 848                         }
 849
 850                         connman_error("Invalid option");
 851
 852                         ret = -EINVAL;
 853                         goto out;
 854
 855                 default:
 856                         if (xt_t == NULL || xt_t->parse == NULL ||
 857                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
 858                                         &xt_t->tflags, NULL, &xt_t->t)) {
 859                                 if (xt_m == NULL || xt_m->parse == NULL)
 860                                         break;
 861
 862                                 xt_m->parse(c - xt_m->option_offset, argv,
 863                                         invert, &xt_m->mflags, NULL, &xt_m->m);
 864                         }
 865
 866                         break;
 867                 }
 868         }
 869
 870         if (table_name == NULL)
 871                 table_name = "filter";
 872
 873         table = iptables_init(table_name);
 874         if (table == NULL) {
 875                 ret = -EINVAL;
 876                 goto out;
 877         }
 878
 879         if (dump) {
 880                 iptables_dump(table);
 881
 882                 ret = 0;
 883                 goto out;
 884         }
 885
 886         if (chain && new_chain) {
 887                 ret = -EINVAL;
 888                 goto out;
 889         }
 890
 891         if (new_chain) {
 892                 DBG("New chain %s", new_chain);
 893
 894                 ret = iptables_add_chain(table, new_chain);
 895                 goto out;
 896         }
 897
 898         if (chain) {
 899                 if (target_name == NULL)
 900                         return -1;
 901
 902                 DBG("Adding %s to %s (match %s)",
 903                                 target_name, chain, match_name);
 904
 905                 ret = iptables_add_rule(table, chain, target_name, xt_t,
 906                                         match_name, xt_m);
 907
 908                 goto out;
 909         }
 910
 911 out:
 912         if (xt_t)
 913                 g_free(xt_t->t);
 914
 915         if (xt_m)
 916                 g_free(xt_m->m);
 917
 918         return ret;
 919 }
 920
 921 int __connman_iptables_command(char *command)
 922 {
 923         char **argv, **arguments;
 924         int argc, i, ret;
 925
 926         if (command == NULL)
 927                 return -EINVAL;
 928
 929         arguments = g_strsplit_set(command, " ", -1);
 930
 931         for (argc = 0; arguments[argc]; argc++);
 932
 933         DBG("command %s argc %d", command, ++argc);
 934
 935         argv = g_try_malloc0(argc * sizeof(char *));
 936         if (argv == NULL) {
 937                 g_strfreev(arguments);
 938                 return -ENOMEM;
 939         }
 940
 941         argv[0] = "iptables";
 942         for (i = 1; i < argc; i++)
 943                 argv[i] = arguments[i - 1];
 944
 945         ret = iptables_command(argc, argv);
 946
 947         g_strfreev(arguments);
 948         g_free(argv);
 949
 950         return ret;
 951 }
 952
 953
 954 int __connman_iptables_commit(char *table_name)
 955 {
 956         struct connman_iptables *table;
 957         struct ipt_replace *repl;
 958
 959         table = g_hash_table_lookup(table_hash, table_name);
 960         if (table == NULL)
 961                 return -EINVAL;
 962
 963         repl = iptables_blob(table);
 964
 965         return iptables_replace(table, repl);
 966 }
 967
 968 static void remove_table(gpointer user_data)
 969 {
 970         struct connman_iptables *table = user_data;
 971
 972         table_cleanup(table);
 973 }
 974
 975 int __connman_iptables_init(void)
 976 {
 977         DBG("");
 978
 979         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
 980                                                 NULL, remove_table);
 981
 982         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
 983
 984         return 0;
 985
 986 }
 987
 988 void __connman_iptables_cleanup(void)
 989 {
 990         g_hash_table_destroy(table_hash);
 991
 992         xtables_free_opts(1);
 993 }