tools/iptables-test.c

   1 /*
   2  *  Connection Manager
   3  *
   4  *  Copyright (C) 2007-2010  Intel Corporation. All rights reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License version 2 as
   8  *  published by the Free Software Foundation.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  *
  19  */
  20
  21 #include <getopt.h>
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/errno.h>
  27 #include <sys/socket.h>
  28 #include <sys/types.h>
  29 #include <arpa/inet.h>
  30 #include <xtables.h>
  31
  32 #include <linux/netfilter_ipv4/ip_tables.h>
  33
  34 #include <glib.h>
  35
  36 static const char *hooknames[] = {
  37         [NF_IP_PRE_ROUTING]     = "PREROUTING",
  38         [NF_IP_LOCAL_IN]        = "INPUT",
  39         [NF_IP_FORWARD]         = "FORWARD",
  40         [NF_IP_LOCAL_OUT]       = "OUTPUT",
  41         [NF_IP_POST_ROUTING]    = "POSTROUTING",
  42 };
  43
  44 #define LABEL_ACCEPT  "ACCEPT"
  45 #define LABEL_DROP    "DROP"
  46 #define LABEL_QUEUE   "QUEUE"
  47 #define LABEL_RETURN  "RETURN"
  48
  49 /* fn returns 0 to continue iteration */
  50 #define _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
  51 ({                                                              \
  52         unsigned int __i;                                       \
  53         int __n;                                                \
  54         int __ret = 0;                                          \
  55         type *__entry;                                          \
  56                                                                 \
  57         for (__i = 0, __n = 0; __i < (size);                    \
  58              __i += __entry->next_offset, __n++) {              \
  59                 __entry = (void *)(entries) + __i;              \
  60                 if (__n < n)                                    \
  61                         continue;                               \
  62                                                                 \
  63                 __ret = fn(__entry,  ## args);                  \
  64                 if (__ret != 0)                                 \
  65                         break;                                  \
  66         }                                                       \
  67         __ret;                                                  \
  68 })
  69
  70 /* fn returns 0 to continue iteration */
  71 #define _XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
  72         _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
  73
  74 #define ENTRY_ITERATE(entries, size, fn, args...) \
  75         _XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
  76
  77 #define MIN_ALIGN (__alignof__(struct ipt_entry))
  78
  79 #define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
  80
  81 struct error_target {
  82         struct xt_entry_target t;
  83         char error[IPT_TABLE_MAXNAMELEN];
  84 };
  85
  86 struct connman_iptables_entry {
  87         int offset;
  88         int builtin;
  89
  90         struct ipt_entry *entry;
  91 };
  92
  93 struct connman_iptables {
  94         int ipt_sock;
  95
  96         struct ipt_getinfo *info;
  97         struct ipt_get_entries *blob_entries;
  98
  99         unsigned int num_entries;
 100         unsigned int old_entries;
 101         unsigned int size;
 102
 103         unsigned int underflow[NF_INET_NUMHOOKS];
 104         unsigned int hook_entry[NF_INET_NUMHOOKS];
 105
 106         GList *entries;
 107 };
 108
 109
 110 static struct ipt_entry *get_entry(struct connman_iptables *table,
 111                                         unsigned int offset)
 112 {
 113         return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
 114                                                                         offset);
 115 }
 116
 117 static int is_hook_entry(struct connman_iptables *table,
 118                                 struct ipt_entry *entry)
 119 {
 120         unsigned int i;
 121
 122         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 123                 if ((table->info->valid_hooks & (1 << i))
 124                 && get_entry(table, table->info->hook_entry[i]) == entry)
 125                         return i;
 126         }
 127
 128         return -1;
 129 }
 130
 131 static unsigned long entry_to_offset(struct connman_iptables *table,
 132                                         struct ipt_entry *entry)
 133 {
 134         return (void *)entry - (void *)table->blob_entries->entrytable;
 135 }
 136
 137 static int target_to_verdict(char *target_name)
 138 {
 139         if (!strcmp(target_name, LABEL_ACCEPT))
 140                 return -NF_ACCEPT - 1;
 141
 142         if (!strcmp(target_name, LABEL_DROP))
 143                 return -NF_DROP - 1;
 144
 145         if (!strcmp(target_name, LABEL_QUEUE))
 146                 return -NF_QUEUE - 1;
 147
 148         if (!strcmp(target_name, LABEL_RETURN))
 149                 return XT_RETURN;
 150
 151         return 0;
 152 }
 153
 154 static gboolean is_builtin_target(char *target_name)
 155 {
 156         if (!strcmp(target_name, LABEL_ACCEPT) ||
 157                 !strcmp(target_name, LABEL_DROP) ||
 158                 !strcmp(target_name, LABEL_QUEUE) ||
 159                 !strcmp(target_name, LABEL_RETURN))
 160                 return TRUE;
 161
 162         return FALSE;
 163 }
 164
 165 static gboolean is_jump(struct connman_iptables_entry *e)
 166 {
 167         struct xt_entry_target *target;
 168
 169         target = ipt_get_target(e->entry);
 170
 171         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 172                 struct xt_standard_target *t;
 173
 174                 t = (struct xt_standard_target *)target;
 175
 176                 switch (t->verdict) {
 177                 case XT_RETURN:
 178                 case -NF_ACCEPT - 1:
 179                 case -NF_DROP - 1:
 180                 case -NF_QUEUE - 1:
 181                 case -NF_STOP - 1:
 182                         return false;
 183
 184                 default:
 185                         return true;
 186                 }
 187         }
 188
 189         return false;
 190 }
 191
 192 static gboolean is_chain(struct connman_iptables *table,
 193                                 struct connman_iptables_entry *e)
 194 {
 195         struct ipt_entry *entry;
 196         struct xt_entry_target *target;
 197
 198         entry = e->entry;
 199         if (e->builtin >= 0)
 200                 return TRUE;
 201
 202         target = ipt_get_target(entry);
 203         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
 204                 return TRUE;
 205
 206         return FALSE;
 207 }
 208
 209 static GList *find_chain_head(struct connman_iptables *table,
 210                                 char *chain_name)
 211 {
 212         GList *list;
 213         struct connman_iptables_entry *head;
 214         struct ipt_entry *entry;
 215         struct xt_entry_target *target;
 216         int builtin;
 217
 218         for (list = table->entries; list; list = list->next) {
 219                 head = list->data;
 220                 entry = head->entry;
 221
 222                 /* Buit-in chain */
 223                 builtin = head->builtin;
 224                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 225                         break;
 226
 227                 /* User defined chain */
 228                 target = ipt_get_target(entry);
 229                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 230                     !strcmp((char *)target->data, chain_name))
 231                         break;
 232         }
 233
 234         return list;
 235 }
 236
 237 static GList *find_chain_tail(struct connman_iptables *table,
 238                                 char *chain_name)
 239 {
 240         GList *chain_head, *list;
 241         struct connman_iptables_entry *tail;
 242
 243         chain_head = find_chain_head(table, chain_name);
 244         if (chain_head == NULL)
 245                 return NULL;
 246
 247         /* Then we look for the next chain */
 248         for (list = chain_head->next; list; list = list->next) {
 249                 tail = list->data;
 250
 251                 if (is_chain(table, tail))
 252                         return list;
 253         }
 254
 255         /* Nothing found, we return the table end */
 256         return g_list_last(table->entries);
 257 }
 258
 259 static void update_offsets(struct connman_iptables *table)
 260 {
 261         GList *list, *prev;
 262         struct connman_iptables_entry *entry, *prev_entry;
 263
 264         for (list = table->entries; list; list = list->next) {
 265                 entry = list->data;
 266
 267                 if (list == table->entries) {
 268                         entry->offset = 0;
 269
 270                         continue;
 271                 }
 272
 273                 prev = list->prev;
 274                 prev_entry = prev->data;
 275
 276                 entry->offset = prev_entry->offset +
 277                                         prev_entry->entry->next_offset;
 278         }
 279 }
 280
 281 static int connman_add_entry(struct connman_iptables *table,
 282                                 struct ipt_entry *entry, GList *before,
 283                                         int builtin)
 284 {
 285         GList *list;
 286         struct connman_iptables_entry *e, *tmp, *entry_before;
 287         struct xt_standard_target *t;
 288
 289         if (table == NULL)
 290                 return -1;
 291
 292         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 293         if (e == NULL)
 294                 return -1;
 295
 296         e->entry = entry;
 297         e->builtin = builtin;
 298
 299         table->entries = g_list_insert_before(table->entries, before, e);
 300         table->num_entries++;
 301         table->size += entry->next_offset;
 302
 303         if (before == NULL) {
 304                 e->offset = table->size - entry->next_offset;
 305
 306                 return 0;
 307         }
 308
 309         entry_before = before->data;
 310
 311         /*
 312          * We've just appended/insterted a new entry. All references
 313          * should be bumped accordingly.
 314          */
 315         for (list = table->entries; list; list = list->next) {
 316                 tmp = list->data;
 317
 318                 if (!is_jump(tmp))
 319                         continue;
 320
 321                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 322
 323                 if (t->verdict > entry_before->offset)
 324                         t->verdict += entry->next_offset;
 325         }
 326
 327         update_offsets(table);
 328
 329         return 0;
 330 }
 331
 332 static int remove_table_entry(struct connman_iptables *table,
 333                                         struct connman_iptables_entry *entry)
 334 {
 335         int removed = 0;
 336
 337         table->num_entries--;
 338         table->size -= entry->entry->next_offset;
 339         removed = entry->entry->next_offset;
 340
 341         g_free(entry->entry);
 342
 343         table->entries = g_list_remove(table->entries, entry);
 344
 345         return removed;
 346 }
 347
 348 static int connman_iptables_flush_chain(struct connman_iptables *table,
 349                                                 char *name)
 350 {
 351         GList *chain_head, *chain_tail, *list, *next;
 352         struct connman_iptables_entry *entry;
 353         int builtin, removed = 0;
 354
 355         chain_head = find_chain_head(table, name);
 356         if (chain_head == NULL)
 357                 return -EINVAL;
 358
 359         chain_tail = find_chain_tail(table, name);
 360         if (chain_tail == NULL)
 361                 return -EINVAL;
 362
 363         entry = chain_head->data;
 364         builtin = entry->builtin;
 365
 366         if (builtin >= 0)
 367                 list = chain_head;
 368         else
 369                 list = chain_head->next;
 370
 371         if (list == chain_tail->prev)
 372                 return 0;
 373
 374         while (list != chain_tail->prev) {
 375                 entry = list->data;
 376                 next = g_list_next(list);
 377
 378                 removed += remove_table_entry(table, entry);
 379
 380                 list = next;
 381         }
 382
 383         if (builtin >= 0) {
 384                 struct connman_iptables_entry *e;
 385
 386                 entry = list->data;
 387
 388                 entry->builtin = builtin;
 389
 390                 table->underflow[builtin] -= removed;
 391
 392                 for (list = chain_tail; list; list = list->next) {
 393                         e = list->data;
 394
 395                         builtin = e->builtin;
 396                         if (builtin < 0)
 397                                 continue;
 398
 399                         table->hook_entry[builtin] -= removed;
 400                         table->underflow[builtin] -= removed;
 401                 }
 402         }
 403
 404         update_offsets(table);
 405
 406         return 0;
 407 }
 408
 409 static int connman_iptables_delete_chain(struct connman_iptables *table,
 410                                                 char *name)
 411 {
 412         GList *chain_head, *chain_tail;
 413         struct connman_iptables_entry *entry;
 414
 415         chain_head = find_chain_head(table, name);
 416         if (chain_head == NULL)
 417                 return -EINVAL;
 418
 419         entry = chain_head->data;
 420
 421         /* We cannot remove builtin chain */
 422         if (entry->builtin >= 0)
 423                 return -EINVAL;
 424
 425         chain_tail = find_chain_tail(table, name);
 426         if (chain_tail == NULL)
 427                 return -EINVAL;
 428
 429         /* Chain must be flushed */
 430         if (chain_head->next != chain_tail->prev)
 431                 return -EINVAL;
 432
 433         remove_table_entry(table, entry);
 434
 435         entry = chain_tail->prev->data;
 436         remove_table_entry(table, entry);
 437
 438         update_offsets(table);
 439
 440         return 0;
 441 }
 442
 443 static int connman_iptables_add_chain(struct connman_iptables *table,
 444                                         char *name)
 445 {
 446         GList *last;
 447         struct ipt_entry *entry_head;
 448         struct ipt_entry *entry_return;
 449         struct error_target *error;
 450         struct ipt_standard_target *standard;
 451         u_int16_t entry_head_size, entry_return_size;
 452
 453         last = g_list_last(table->entries);
 454
 455         /*
 456          * An empty chain is composed of:
 457          * - A head entry, with no match and an error target.
 458          *   The error target data is the chain name.
 459          * - A tail entry, with no match and a standard target.
 460          *   The standard target verdict is XT_RETURN (return to the
 461          *   caller).
 462          */
 463
 464         /* head entry */
 465         entry_head_size = sizeof(struct ipt_entry) +
 466                                 sizeof(struct error_target);
 467         entry_head = g_try_malloc0(entry_head_size);
 468         if (entry_head == NULL)
 469                 goto err_head;
 470
 471         memset(entry_head, 0, entry_head_size);
 472
 473         entry_head->target_offset = sizeof(struct ipt_entry);
 474         entry_head->next_offset = entry_head_size;
 475
 476         error = (struct error_target *) entry_head->elems;
 477         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 478         error->t.u.user.target_size = ALIGN(sizeof(struct error_target));
 479         strcpy(error->error, name);
 480
 481         if (connman_add_entry(table, entry_head, last, -1) < 0)
 482                 goto err_head;
 483
 484         /* tail entry */
 485         entry_return_size = sizeof(struct ipt_entry) +
 486                                 sizeof(struct ipt_standard_target);
 487         entry_return = g_try_malloc0(entry_return_size);
 488         if (entry_return == NULL)
 489                 goto err;
 490
 491         memset(entry_return, 0, entry_return_size);
 492
 493         entry_return->target_offset = sizeof(struct ipt_entry);
 494         entry_return->next_offset = entry_return_size;
 495
 496         standard = (struct ipt_standard_target *) entry_return->elems;
 497         standard->target.u.user.target_size =
 498                                 ALIGN(sizeof(struct ipt_standard_target));
 499         standard->verdict = XT_RETURN;
 500
 501         if (connman_add_entry(table, entry_return, last, -1) < 0)
 502                 goto err;
 503
 504         return 0;
 505
 506 err:
 507         g_free(entry_return);
 508 err_head:
 509         g_free(entry_head);
 510
 511         return -ENOMEM;
 512 }
 513
 514 static struct ipt_entry *
 515 new_rule(struct ipt_ip *ip, char *target_name,
 516                 struct xtables_target *xt_t,
 517                 char *match_name, struct xtables_match *xt_m)
 518 {
 519         struct ipt_entry *new_entry;
 520         size_t match_size, target_size;
 521
 522         if (xt_m)
 523                 match_size = xt_m->m->u.match_size;
 524         else
 525                 match_size = 0;
 526
 527         if (xt_t)
 528                 target_size = ALIGN(xt_t->t->u.target_size);
 529         else
 530                 target_size = ALIGN(sizeof(struct xt_standard_target));
 531
 532         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 533                                                                 match_size);
 534         if (new_entry == NULL)
 535                 return NULL;
 536
 537         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 538
 539         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 540         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 541                                                                 match_size;
 542         if (xt_m) {
 543                 struct xt_entry_match *entry_match;
 544
 545                 entry_match = (struct xt_entry_match *)new_entry->elems;
 546                 memcpy(entry_match, xt_m->m, match_size);
 547         }
 548
 549         if (xt_t) {
 550                 struct xt_entry_target *entry_target;
 551
 552                 entry_target = ipt_get_target(new_entry);
 553                 memcpy(entry_target, xt_t->t, target_size);
 554         }
 555
 556         return new_entry;
 557 }
 558
 559 static void update_hooks(struct connman_iptables *table, GList *chain_head,
 560                                 struct ipt_entry *entry)
 561 {
 562         GList *list;
 563         struct connman_iptables_entry *head, *e;
 564         int builtin;
 565
 566         if (chain_head == NULL)
 567                 return;
 568
 569         head = chain_head->data;
 570
 571         builtin = head->builtin;
 572         if (builtin < 0)
 573                 return;
 574
 575         table->underflow[builtin] += entry->next_offset;
 576
 577         for (list = chain_head->next; list; list = list->next) {
 578                 e = list->data;
 579
 580                 builtin = e->builtin;
 581                 if (builtin < 0)
 582                         continue;
 583
 584                 table->hook_entry[builtin] += entry->next_offset;
 585                 table->underflow[builtin] += entry->next_offset;
 586         }
 587 }
 588
 589 static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
 590                                 struct ipt_ip *ip, char *chain_name,
 591                                 char *target_name, struct xtables_target *xt_t,
 592                                 char *match_name, struct xtables_match *xt_m,
 593                                 int *builtin)
 594 {
 595         GList *chain_tail, *chain_head;
 596         struct ipt_entry *new_entry;
 597         struct connman_iptables_entry *head;
 598
 599         chain_head = find_chain_head(table, chain_name);
 600         if (chain_head == NULL)
 601                 return NULL;
 602
 603         chain_tail = find_chain_tail(table, chain_name);
 604         if (chain_tail == NULL)
 605                 return NULL;
 606
 607         new_entry = new_rule(ip, target_name, xt_t, match_name, xt_m);
 608         if (new_entry == NULL)
 609                 return NULL;
 610
 611         update_hooks(table, chain_head, new_entry);
 612
 613         /*
 614          * If the chain is builtin, and does not have any rule,
 615          * then the one that we're inserting is becoming the head
 616          * and thus needs the builtin flag.
 617          */
 618         head = chain_head->data;
 619         if (head->builtin < 0)
 620                 *builtin = -1;
 621         else if (chain_head == chain_tail->prev) {
 622                 *builtin = head->builtin;
 623                 head->builtin = -1;
 624         }
 625
 626         return new_entry;
 627 }
 628
 629 static int
 630 connman_iptables_append_rule(struct connman_iptables *table,
 631                                 struct ipt_ip *ip, char *chain_name,
 632                                 char *target_name, struct xtables_target *xt_t,
 633                                 char *match_name, struct xtables_match *xt_m)
 634 {
 635         GList *chain_tail;
 636         struct ipt_entry *new_entry;
 637         int builtin = -1, ret;
 638
 639         chain_tail = find_chain_tail(table, chain_name);
 640         if (chain_tail == NULL)
 641                 return -EINVAL;
 642
 643         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 644                         target_name, xt_t, match_name, xt_m, &builtin);
 645         if (new_entry == NULL)
 646                 return -EINVAL;
 647
 648         ret = connman_add_entry(table, new_entry, chain_tail->prev, builtin);
 649         if (ret < 0)
 650                 g_free(new_entry);
 651
 652         return ret;
 653 }
 654
 655 static int connman_iptables_insert_rule(struct connman_iptables *table,
 656                                 struct ipt_ip *ip, char *chain_name,
 657                                 char *target_name, struct xtables_target *xt_t,
 658                                 char *match_name, struct xtables_match *xt_m)
 659 {
 660         GList *chain_head;
 661         struct ipt_entry *new_entry;
 662         int builtin = -1, ret;
 663
 664         chain_head = find_chain_head(table, chain_name);
 665         if (chain_head == NULL)
 666                 return -EINVAL;
 667
 668         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 669                         target_name, xt_t, match_name, xt_m, &builtin);
 670         if (new_entry == NULL)
 671                 return -EINVAL;
 672
 673         ret = connman_add_entry(table, new_entry, chain_head->next, builtin);
 674         if (ret < 0)
 675                 g_free(new_entry);
 676
 677         return ret;
 678 }
 679
 680 static struct ipt_replace *
 681 connman_iptables_blob(struct connman_iptables *table)
 682 {
 683         struct ipt_replace *r;
 684         GList *list;
 685         struct connman_iptables_entry *e;
 686         unsigned char *entry_index;
 687
 688         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 689         if (r == NULL)
 690                 return NULL;
 691
 692         memset(r, 0, sizeof(*r) + table->size);
 693
 694         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 695                                 * table->old_entries);
 696         if (r->counters == NULL) {
 697                 g_free(r);
 698                 return NULL;
 699         }
 700
 701         strcpy(r->name, table->info->name);
 702         r->num_entries = table->num_entries;
 703         r->size = table->size;
 704
 705         r->num_counters = table->old_entries;
 706         r->valid_hooks  = table->info->valid_hooks;
 707
 708         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 709         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 710
 711         entry_index = (unsigned char *)r->entries;
 712         for (list = table->entries; list; list = list->next) {
 713                 e = list->data;
 714
 715                 memcpy(entry_index, e->entry, e->entry->next_offset);
 716                 entry_index += e->entry->next_offset;
 717         }
 718
 719         return r;
 720 }
 721
 722 static void dump_target(struct connman_iptables *table,
 723                                 struct ipt_entry *entry)
 724
 725 {
 726         struct xtables_target *xt_t;
 727         struct xt_entry_target *target;
 728
 729         target = ipt_get_target(entry);
 730
 731         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 732                 struct xt_standard_target *t;
 733
 734                 t = (struct xt_standard_target *)target;
 735
 736                 switch (t->verdict) {
 737                 case XT_RETURN:
 738                         printf("\ttarget RETURN\n");
 739                         break;
 740
 741                 case -NF_ACCEPT - 1:
 742                         printf("\ttarget ACCEPT\n");
 743                         break;
 744
 745                 case -NF_DROP - 1:
 746                         printf("\ttarget DROP\n");
 747                         break;
 748
 749                 case -NF_QUEUE - 1:
 750                         printf("\ttarget QUEUE\n");
 751                         break;
 752
 753                 case -NF_STOP - 1:
 754                         printf("\ttarget STOP\n");
 755                         break;
 756
 757                 default:
 758                         printf("\tJUMP @%p (0x%x)\n",
 759                                 (char*)table->blob_entries->entrytable +
 760                                 t->verdict, t->verdict);
 761                         break;
 762                 }
 763
 764                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 765                                                 XTF_LOAD_MUST_SUCCEED);
 766
 767                 if(xt_t->print != NULL)
 768                         xt_t->print(NULL, target, 1);
 769         } else {
 770                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 771                 if (xt_t == NULL) {
 772                         printf("\ttarget %s\n", target->u.user.name);
 773                         return;
 774                 }
 775
 776                 if(xt_t->print != NULL) {
 777                         printf("\ttarget ");
 778                         xt_t->print(NULL, target, 1);
 779                         printf("\n");
 780                 }
 781         }
 782 }
 783
 784 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 785 {
 786         struct xtables_match *xt_m;
 787         struct xt_entry_match *match;
 788
 789         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 790                 return;
 791
 792         match = (struct xt_entry_match *) entry->elems;
 793
 794         if (!strlen(match->u.user.name))
 795                 return;
 796
 797         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 798         if (xt_m == NULL)
 799                 goto out;
 800
 801         if(xt_m->print != NULL) {
 802                 printf("\tmatch ");
 803                 xt_m->print(NULL, match, 1);
 804                 printf("\n");
 805
 806                 return;
 807         }
 808
 809 out:
 810         printf("\tmatch %s\n", match->u.user.name);
 811
 812 }
 813
 814 static int connman_iptables_dump_entry(struct ipt_entry *entry,
 815                                         struct connman_iptables *table)
 816 {
 817         struct xt_entry_target *target;
 818         unsigned int offset;
 819         int builtin;
 820
 821         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 822         target = ipt_get_target(entry);
 823         builtin = is_hook_entry(table, entry);
 824
 825         if (entry_to_offset(table, entry) + entry->next_offset ==
 826                                         table->blob_entries->size) {
 827                 printf("End of CHAIN 0x%x\n", offset);
 828                 return 0;
 829         }
 830
 831         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 832                 printf("USER CHAIN (%s) %p  match %p  target %p  size %d\n",
 833                         target->data, entry, entry->elems,
 834                         (char *)entry + entry->target_offset,
 835                                 entry->next_offset);
 836
 837                 return 0;
 838         } else if (builtin >= 0) {
 839                 printf("CHAIN (%s) %p  match %p  target %p  size %d\n",
 840                         hooknames[builtin], entry, entry->elems,
 841                         (char *)entry + entry->target_offset,
 842                                 entry->next_offset);
 843         } else {
 844                 printf("RULE %p  match %p  target %p  size %d\n", entry,
 845                         entry->elems,
 846                         (char *)entry + entry->target_offset,
 847                                 entry->next_offset);
 848         }
 849
 850         dump_match(table, entry);
 851         dump_target(table, entry);
 852
 853         return 0;
 854 }
 855
 856 static void connman_iptables_dump_hook(struct connman_iptables *table)
 857 {
 858         int i;
 859         printf("hooks: \n");
 860         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 861                 if ((table->info->valid_hooks & (1 << i)))
 862                         printf("%s entry %p underflow %p (%#x)\n",
 863                                 hooknames[i],
 864                                 table->blob_entries->entrytable +
 865                                                 table->info->hook_entry[i],
 866                                 table->blob_entries->entrytable +
 867                                                 table->info->underflow[i],
 868                                         table->info->underflow[i]);
 869         }
 870 }
 871
 872 static void connman_iptables_dump(struct connman_iptables *table)
 873 {
 874         printf("%s valid_hooks=0x%08x, num_entries=%u, size=%u\n",
 875                 table->info->name,
 876                 table->info->valid_hooks, table->info->num_entries,
 877                 table->info->size);
 878
 879         connman_iptables_dump_hook(table);
 880
 881         ENTRY_ITERATE(table->blob_entries->entrytable,
 882                         table->blob_entries->size,
 883                         connman_iptables_dump_entry, table);
 884
 885 }
 886
 887 static int connman_iptables_get_entries(struct connman_iptables *table)
 888 {
 889         socklen_t entry_size;
 890
 891         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 892
 893         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 894                                 table->blob_entries, &entry_size);
 895 }
 896
 897 static int connman_iptables_replace(struct connman_iptables *table,
 898                                         struct ipt_replace *r)
 899 {
 900         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 901                          sizeof(*r) + r->size);
 902 }
 903
 904 static void connman_iptables_cleanup(struct connman_iptables *table)
 905 {
 906         GList *list;
 907         struct connman_iptables_entry *entry;
 908
 909         close(table->ipt_sock);
 910
 911         for (list = table->entries; list; list = list->next) {
 912                 entry = list->data;
 913
 914                 g_free(entry->entry);
 915         }
 916
 917         g_free(table->info);
 918         g_free(table->blob_entries);
 919         g_free(table);
 920
 921         xtables_free_opts(1);
 922 }
 923
 924 static int connman_iptables_commit(struct connman_iptables *table)
 925 {
 926         struct ipt_replace *repl;
 927
 928         repl = connman_iptables_blob(table);
 929
 930         return connman_iptables_replace(table, repl);
 931 }
 932
 933 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 934 {
 935         struct ipt_entry *new_entry;
 936         int builtin;
 937
 938         new_entry = g_try_malloc0(entry->next_offset);
 939         if (new_entry == NULL)
 940                 return -ENOMEM;
 941
 942         memcpy(new_entry, entry, entry->next_offset);
 943
 944         builtin = is_hook_entry(table, entry);
 945
 946         return connman_add_entry(table, new_entry, NULL, builtin);
 947 }
 948
 949 static struct connman_iptables *connman_iptables_init(const char *table_name)
 950 {
 951         struct connman_iptables *table;
 952         socklen_t s;
 953
 954         table =  g_try_new0(struct connman_iptables, 1);
 955         if (table == NULL)
 956                 return NULL;
 957
 958         table->info =  g_try_new0(struct ipt_getinfo, 1);
 959         if (table->info == NULL)
 960                 goto err;
 961
 962         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 963         if (table->ipt_sock < 0)
 964                 goto err;
 965
 966         s = sizeof(*table->info);
 967         strcpy(table->info->name, table_name);
 968         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 969                                                 table->info, &s) < 0)
 970                 goto err;
 971
 972         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 973                                                 table->info->size);
 974         if (table->blob_entries == NULL)
 975                 goto err;
 976
 977         strcpy(table->blob_entries->name, table_name);
 978         table->blob_entries->size = table->info->size;
 979
 980         if (connman_iptables_get_entries(table) < 0)
 981                 goto err;
 982
 983         table->num_entries = 0;
 984         table->old_entries = table->info->num_entries;
 985         table->size = 0;
 986
 987         memcpy(table->underflow, table->info->underflow,
 988                                 sizeof(table->info->underflow));
 989         memcpy(table->hook_entry, table->info->hook_entry,
 990                                 sizeof(table->info->hook_entry));
 991
 992         ENTRY_ITERATE(table->blob_entries->entrytable,
 993                         table->blob_entries->size,
 994                                 add_entry, table);
 995
 996
 997         return table;
 998
 999 err:
1000
1001         connman_iptables_cleanup(table);
1002
1003         return NULL;
1004 }
1005
1006 static struct xtables_target *prepare_target(struct connman_iptables *table,
1007                                                         char *target_name)
1008 {
1009         struct xtables_target *xt_t = NULL;
1010         gboolean is_builtin, is_user_defined;
1011         GList *chain_head = NULL;
1012         size_t target_size;
1013
1014         is_builtin = FALSE;
1015         is_user_defined = FALSE;
1016
1017         if (is_builtin_target(target_name))
1018                 is_builtin = TRUE;
1019         else {
1020                 chain_head = find_chain_head(table, target_name);
1021                 if (chain_head != NULL && chain_head->next != NULL)
1022                         is_user_defined = TRUE;
1023         }
1024
1025         if (is_builtin || is_user_defined)
1026                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1027                                                 XTF_LOAD_MUST_SUCCEED);
1028         else
1029                 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1030
1031         if (xt_t == NULL)
1032                 return NULL;
1033
1034         target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1035
1036         xt_t->t = g_try_malloc0(target_size);
1037         if (xt_t->t == NULL)
1038                 return NULL;
1039
1040         xt_t->t->u.target_size = target_size;
1041
1042         if (is_builtin || is_user_defined) {
1043                 struct xt_standard_target *target;
1044
1045                 target = (struct xt_standard_target *)(xt_t->t);
1046                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
1047
1048                 if (is_builtin == TRUE)
1049                         target->verdict = target_to_verdict(target_name);
1050                 else if (is_user_defined == TRUE) {
1051                         struct connman_iptables_entry *target_rule;
1052
1053                         if (chain_head == NULL) {
1054                                 g_free(xt_t->t);
1055                                 return NULL;
1056                         }
1057
1058                         target_rule = chain_head->next->data;
1059                         target->verdict = target_rule->offset;
1060                 }
1061         } else {
1062                 strcpy(xt_t->t->u.user.name, target_name);
1063                 xt_t->t->u.user.revision = xt_t->revision;
1064                 if (xt_t->init != NULL)
1065                         xt_t->init(xt_t->t);
1066         }
1067
1068         return xt_t;
1069 }
1070
1071 static struct option connman_iptables_opts[] = {
1072         {.name = "append",        .has_arg = 1, .val = 'A'},
1073         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
1074         {.name = "insert",        .has_arg = 1, .val = 'I'},
1075         {.name = "list",          .has_arg = 2, .val = 'L'},
1076         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
1077         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
1078         {.name = "destination",   .has_arg = 1, .val = 'd'},
1079         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
1080         {.name = "jump",          .has_arg = 1, .val = 'j'},
1081         {.name = "match",         .has_arg = 1, .val = 'm'},
1082         {.name = "out-interface", .has_arg = 1, .val = 'o'},
1083         {.name = "source",        .has_arg = 1, .val = 's'},
1084         {.name = "table",         .has_arg = 1, .val = 't'},
1085         {NULL},
1086 };
1087
1088 struct xtables_globals connman_iptables_globals = {
1089         .option_offset = 0,
1090         .opts = connman_iptables_opts,
1091         .orig_opts = connman_iptables_opts,
1092 };
1093
1094 int main(int argc, char *argv[])
1095 {
1096         struct connman_iptables *table;
1097         struct xtables_match *xt_m;
1098         struct xtables_target *xt_t;
1099         struct ipt_ip ip;
1100         char *table_name, *chain, *new_chain, *match_name, *target_name;
1101         char *delete_chain, *flush_chain;
1102         int c, in_len, out_len;
1103         size_t size;
1104         gboolean dump, invert, delete, insert;
1105         struct in_addr src, dst;
1106
1107         xtables_init_all(&connman_iptables_globals, NFPROTO_IPV4);
1108
1109         dump = FALSE;
1110         invert = FALSE;
1111         delete = FALSE;
1112         insert = FALSE;
1113         table_name = chain = new_chain = match_name = target_name = NULL;
1114         delete_chain = flush_chain = NULL;
1115         memset(&ip, 0, sizeof(struct ipt_ip));
1116         table = NULL;
1117         xt_m = NULL;
1118         xt_t = NULL;
1119
1120         while ((c = getopt_long(argc, argv, "-A:F:I:L::N:X:d:i:j:m:o:s:t:",
1121                                 connman_iptables_globals.opts, NULL)) != -1) {
1122                 switch (c) {
1123                 case 'A':
1124                         /* It is either -A, -D or -I at once */
1125                         if (chain)
1126                                 goto out;
1127
1128                         chain = optarg;
1129                         break;
1130
1131                 case 'F':
1132                         flush_chain = optarg;
1133                         break;
1134
1135                 case 'I':
1136                         /* It is either -A, -D or -I at once */
1137                         if (chain)
1138                                 goto out;
1139
1140                         chain = optarg;
1141                         insert = TRUE;
1142                         break;
1143
1144                 case 'L':
1145                         dump = true;
1146                         break;
1147
1148                 case 'N':
1149                         new_chain = optarg;
1150                         break;
1151
1152                 case 'X':
1153                         delete = true;
1154                         delete_chain = optarg;
1155                         break;
1156
1157                 case 'd':
1158                         if (!inet_pton(AF_INET, optarg, &dst))
1159                                 break;
1160
1161                         ip.dst = dst;
1162                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1163
1164                         if (invert)
1165                                 ip.invflags |= IPT_INV_DSTIP;
1166
1167                         break;
1168
1169                 case 'i':
1170                         in_len = strlen(optarg);
1171
1172                         if (in_len + 1 > IFNAMSIZ)
1173                                 break;
1174
1175                         strcpy(ip.iniface, optarg);
1176                         memset(ip.iniface_mask, 0xff, in_len + 1);
1177
1178                         if (invert)
1179                                 ip.invflags |= IPT_INV_VIA_IN;
1180
1181                         break;
1182
1183                 case 'j':
1184                         target_name = optarg;
1185                         break;
1186
1187                 case 'm':
1188                         match_name = optarg;
1189
1190                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1191                         size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
1192                         xt_m->m = g_try_malloc0(size);
1193                         if (xt_m == NULL)
1194                                 goto out;
1195                         xt_m->m->u.match_size = size;
1196                         strcpy(xt_m->m->u.user.name, xt_m->name);
1197                         xt_m->m->u.user.revision = xt_m->revision;
1198                         if (xt_m->init != NULL)
1199                                 xt_m->init(xt_m->m);
1200                         if (xt_m != xt_m->next) {
1201                                 connman_iptables_globals.opts =
1202                                         xtables_merge_options(
1203 #if XTABLES_VERSION_CODE > 5
1204                                                 connman_iptables_globals.orig_opts,
1205 #endif
1206                                                 connman_iptables_globals.opts,
1207                                                 xt_m->extra_opts,
1208                                                 &xt_m->option_offset);
1209                                 if (connman_iptables_globals.opts == NULL)
1210                                         goto out;
1211                         }
1212
1213                         break;
1214
1215                 case 'o':
1216                         out_len = strlen(optarg);
1217
1218                         if (out_len + 1 > IFNAMSIZ)
1219                                 break;
1220
1221                         strcpy(ip.outiface, optarg);
1222                         memset(ip.outiface_mask, 0xff, out_len + 1);
1223
1224                         if (invert)
1225                                 ip.invflags |= IPT_INV_VIA_OUT;
1226
1227                         break;
1228
1229                 case 's':
1230                         if (!inet_pton(AF_INET, optarg, &src))
1231                                 break;
1232
1233                         ip.src = src;
1234                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1235
1236                         if (invert)
1237                                 ip.invflags |= IPT_INV_SRCIP;
1238
1239                         break;
1240
1241                 case 't':
1242                         table_name = optarg;
1243                         break;
1244
1245                 case 1:
1246                         if (optarg[0] == '!' && optarg[1] == '\0') {
1247                                 if (invert)
1248                                         printf("Consecutive ! not allowed\n");
1249
1250                                 invert = TRUE;
1251                                 optarg[0] = '\0';
1252                                 continue;
1253                         }
1254
1255                         printf("Invalid option\n");
1256
1257                         return -1;
1258
1259                 default:
1260                         if (xt_t == NULL || xt_t->parse == NULL ||
1261                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1262                                         &xt_t->tflags, NULL, &xt_t->t)) {
1263                                 if (xt_m == NULL || xt_m->parse == NULL)
1264                                         break;
1265
1266                                 xt_m->parse(c - xt_m->option_offset, argv,
1267                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1268                         }
1269
1270                         break;
1271                 }
1272         }
1273
1274         if (table_name == NULL)
1275                 table_name = "filter";
1276
1277         table = connman_iptables_init(table_name);
1278         if (table == NULL)
1279                 return -1;
1280
1281         if (delete) {
1282                 if (delete_chain == NULL)
1283                         goto out;
1284
1285                 printf("Delete chain %s\n", delete_chain);
1286
1287                 connman_iptables_delete_chain(table, delete_chain);
1288
1289                 goto commit;
1290         }
1291
1292         if (flush_chain) {
1293                 printf("Flush chain %s\n", flush_chain);
1294
1295                 connman_iptables_flush_chain(table, flush_chain);
1296
1297                 goto commit;
1298         }
1299
1300         if (dump) {
1301                 connman_iptables_dump(table);
1302
1303                 return 0;
1304         }
1305
1306         if (chain && new_chain)
1307                 return -1;
1308
1309         if (new_chain) {
1310                 printf("New chain %s\n", new_chain);
1311
1312                 connman_iptables_add_chain(table, new_chain);
1313
1314                 goto commit;
1315         }
1316
1317         if (chain) {
1318                 xt_t = prepare_target(table, target_name);
1319                 if (xt_t == NULL)
1320                         goto out;
1321
1322                 connman_iptables_globals.opts =
1323                         xtables_merge_options(
1324 #if XTABLES_VERSION_CODE > 5
1325                                         connman_iptables_globals.orig_opts,
1326 #endif
1327                                         connman_iptables_globals.opts,
1328                                         xt_t->extra_opts,
1329                                         &xt_t->option_offset);
1330                 if (connman_iptables_globals.opts == NULL)
1331                         goto out;
1332
1333                 if (insert == TRUE) {
1334                         printf("Inserting %s to %s (match %s)\n", target_name,
1335                                         chain, match_name);
1336
1337                         connman_iptables_insert_rule(table, &ip, chain,
1338                                         target_name, xt_t, match_name, xt_m);
1339                 } else {
1340                         printf("Appending %s to %s (match %s)\n", target_name,
1341                                         chain, match_name);
1342
1343                         connman_iptables_append_rule(table, &ip, chain,
1344                                 target_name, xt_t, match_name, xt_m);
1345                 }
1346         }
1347
1348 commit:
1349
1350         connman_iptables_commit(table);
1351
1352 out:
1353         connman_iptables_cleanup(table);
1354
1355         if (xt_t)
1356                 g_free(xt_t->t);
1357
1358         if (xt_m)
1359                 g_free(xt_m->m);
1360
1361         return 0;
1362 }