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 void update_targets_reference(struct connman_iptables *table,
 282                                 struct connman_iptables_entry *entry_before,
 283                                 struct connman_iptables_entry *modified_entry)
 284 {
 285         struct connman_iptables_entry *tmp;
 286         struct xt_standard_target *t;
 287         GList *list;
 288
 289         for (list = table->entries; list; list = list->next) {
 290                 tmp = list->data;
 291
 292                 if (!is_jump(tmp))
 293                         continue;
 294
 295                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 296
 297                 if (t->verdict > entry_before->offset)
 298                         t->verdict += modified_entry->entry->next_offset;
 299         }
 300 }
 301
 302 static int connman_add_entry(struct connman_iptables *table,
 303                                 struct ipt_entry *entry, GList *before,
 304                                         int builtin)
 305 {
 306         struct connman_iptables_entry *e, *entry_before;
 307
 308         if (table == NULL)
 309                 return -1;
 310
 311         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 312         if (e == NULL)
 313                 return -1;
 314
 315         e->entry = entry;
 316         e->builtin = builtin;
 317
 318         table->entries = g_list_insert_before(table->entries, before, e);
 319         table->num_entries++;
 320         table->size += entry->next_offset;
 321
 322         if (before == NULL) {
 323                 e->offset = table->size - entry->next_offset;
 324
 325                 return 0;
 326         }
 327
 328         entry_before = before->data;
 329
 330         /*
 331          * We've just appended/insterted a new entry. All references
 332          * should be bumped accordingly.
 333          */
 334         update_targets_reference(table, entry_before, e);
 335
 336         update_offsets(table);
 337
 338         return 0;
 339 }
 340
 341 static int remove_table_entry(struct connman_iptables *table,
 342                                         struct connman_iptables_entry *entry)
 343 {
 344         int removed = 0;
 345
 346         table->num_entries--;
 347         table->size -= entry->entry->next_offset;
 348         removed = entry->entry->next_offset;
 349
 350         g_free(entry->entry);
 351
 352         table->entries = g_list_remove(table->entries, entry);
 353
 354         return removed;
 355 }
 356
 357 static int connman_iptables_flush_chain(struct connman_iptables *table,
 358                                                 char *name)
 359 {
 360         GList *chain_head, *chain_tail, *list, *next;
 361         struct connman_iptables_entry *entry;
 362         int builtin, removed = 0;
 363
 364         chain_head = find_chain_head(table, name);
 365         if (chain_head == NULL)
 366                 return -EINVAL;
 367
 368         chain_tail = find_chain_tail(table, name);
 369         if (chain_tail == NULL)
 370                 return -EINVAL;
 371
 372         entry = chain_head->data;
 373         builtin = entry->builtin;
 374
 375         if (builtin >= 0)
 376                 list = chain_head;
 377         else
 378                 list = chain_head->next;
 379
 380         if (list == chain_tail->prev)
 381                 return 0;
 382
 383         while (list != chain_tail->prev) {
 384                 entry = list->data;
 385                 next = g_list_next(list);
 386
 387                 removed += remove_table_entry(table, entry);
 388
 389                 list = next;
 390         }
 391
 392         if (builtin >= 0) {
 393                 struct connman_iptables_entry *e;
 394
 395                 entry = list->data;
 396
 397                 entry->builtin = builtin;
 398
 399                 table->underflow[builtin] -= removed;
 400
 401                 for (list = chain_tail; list; list = list->next) {
 402                         e = list->data;
 403
 404                         builtin = e->builtin;
 405                         if (builtin < 0)
 406                                 continue;
 407
 408                         table->hook_entry[builtin] -= removed;
 409                         table->underflow[builtin] -= removed;
 410                 }
 411         }
 412
 413         update_offsets(table);
 414
 415         return 0;
 416 }
 417
 418 static int connman_iptables_delete_chain(struct connman_iptables *table,
 419                                                 char *name)
 420 {
 421         GList *chain_head, *chain_tail;
 422         struct connman_iptables_entry *entry;
 423
 424         chain_head = find_chain_head(table, name);
 425         if (chain_head == NULL)
 426                 return -EINVAL;
 427
 428         entry = chain_head->data;
 429
 430         /* We cannot remove builtin chain */
 431         if (entry->builtin >= 0)
 432                 return -EINVAL;
 433
 434         chain_tail = find_chain_tail(table, name);
 435         if (chain_tail == NULL)
 436                 return -EINVAL;
 437
 438         /* Chain must be flushed */
 439         if (chain_head->next != chain_tail->prev)
 440                 return -EINVAL;
 441
 442         remove_table_entry(table, entry);
 443
 444         entry = chain_tail->prev->data;
 445         remove_table_entry(table, entry);
 446
 447         update_offsets(table);
 448
 449         return 0;
 450 }
 451
 452 static int connman_iptables_add_chain(struct connman_iptables *table,
 453                                         char *name)
 454 {
 455         GList *last;
 456         struct ipt_entry *entry_head;
 457         struct ipt_entry *entry_return;
 458         struct error_target *error;
 459         struct ipt_standard_target *standard;
 460         u_int16_t entry_head_size, entry_return_size;
 461
 462         last = g_list_last(table->entries);
 463
 464         /*
 465          * An empty chain is composed of:
 466          * - A head entry, with no match and an error target.
 467          *   The error target data is the chain name.
 468          * - A tail entry, with no match and a standard target.
 469          *   The standard target verdict is XT_RETURN (return to the
 470          *   caller).
 471          */
 472
 473         /* head entry */
 474         entry_head_size = sizeof(struct ipt_entry) +
 475                                 sizeof(struct error_target);
 476         entry_head = g_try_malloc0(entry_head_size);
 477         if (entry_head == NULL)
 478                 goto err_head;
 479
 480         memset(entry_head, 0, entry_head_size);
 481
 482         entry_head->target_offset = sizeof(struct ipt_entry);
 483         entry_head->next_offset = entry_head_size;
 484
 485         error = (struct error_target *) entry_head->elems;
 486         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 487         error->t.u.user.target_size = ALIGN(sizeof(struct error_target));
 488         strcpy(error->error, name);
 489
 490         if (connman_add_entry(table, entry_head, last, -1) < 0)
 491                 goto err_head;
 492
 493         /* tail entry */
 494         entry_return_size = sizeof(struct ipt_entry) +
 495                                 sizeof(struct ipt_standard_target);
 496         entry_return = g_try_malloc0(entry_return_size);
 497         if (entry_return == NULL)
 498                 goto err;
 499
 500         memset(entry_return, 0, entry_return_size);
 501
 502         entry_return->target_offset = sizeof(struct ipt_entry);
 503         entry_return->next_offset = entry_return_size;
 504
 505         standard = (struct ipt_standard_target *) entry_return->elems;
 506         standard->target.u.user.target_size =
 507                                 ALIGN(sizeof(struct ipt_standard_target));
 508         standard->verdict = XT_RETURN;
 509
 510         if (connman_add_entry(table, entry_return, last, -1) < 0)
 511                 goto err;
 512
 513         return 0;
 514
 515 err:
 516         g_free(entry_return);
 517 err_head:
 518         g_free(entry_head);
 519
 520         return -ENOMEM;
 521 }
 522
 523 static struct ipt_entry *
 524 new_rule(struct ipt_ip *ip, char *target_name,
 525                 struct xtables_target *xt_t,
 526                 char *match_name, struct xtables_match *xt_m)
 527 {
 528         struct ipt_entry *new_entry;
 529         size_t match_size, target_size;
 530
 531         if (xt_m)
 532                 match_size = xt_m->m->u.match_size;
 533         else
 534                 match_size = 0;
 535
 536         if (xt_t)
 537                 target_size = ALIGN(xt_t->t->u.target_size);
 538         else
 539                 target_size = ALIGN(sizeof(struct xt_standard_target));
 540
 541         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 542                                                                 match_size);
 543         if (new_entry == NULL)
 544                 return NULL;
 545
 546         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 547
 548         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 549         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 550                                                                 match_size;
 551         if (xt_m) {
 552                 struct xt_entry_match *entry_match;
 553
 554                 entry_match = (struct xt_entry_match *)new_entry->elems;
 555                 memcpy(entry_match, xt_m->m, match_size);
 556         }
 557
 558         if (xt_t) {
 559                 struct xt_entry_target *entry_target;
 560
 561                 entry_target = ipt_get_target(new_entry);
 562                 memcpy(entry_target, xt_t->t, target_size);
 563         }
 564
 565         return new_entry;
 566 }
 567
 568 static void update_hooks(struct connman_iptables *table, GList *chain_head,
 569                                 struct ipt_entry *entry)
 570 {
 571         GList *list;
 572         struct connman_iptables_entry *head, *e;
 573         int builtin;
 574
 575         if (chain_head == NULL)
 576                 return;
 577
 578         head = chain_head->data;
 579
 580         builtin = head->builtin;
 581         if (builtin < 0)
 582                 return;
 583
 584         table->underflow[builtin] += entry->next_offset;
 585
 586         for (list = chain_head->next; list; list = list->next) {
 587                 e = list->data;
 588
 589                 builtin = e->builtin;
 590                 if (builtin < 0)
 591                         continue;
 592
 593                 table->hook_entry[builtin] += entry->next_offset;
 594                 table->underflow[builtin] += entry->next_offset;
 595         }
 596 }
 597
 598 static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
 599                                 struct ipt_ip *ip, char *chain_name,
 600                                 char *target_name, struct xtables_target *xt_t,
 601                                 char *match_name, struct xtables_match *xt_m,
 602                                 int *builtin)
 603 {
 604         GList *chain_tail, *chain_head;
 605         struct ipt_entry *new_entry;
 606         struct connman_iptables_entry *head;
 607
 608         chain_head = find_chain_head(table, chain_name);
 609         if (chain_head == NULL)
 610                 return NULL;
 611
 612         chain_tail = find_chain_tail(table, chain_name);
 613         if (chain_tail == NULL)
 614                 return NULL;
 615
 616         new_entry = new_rule(ip, target_name, xt_t, match_name, xt_m);
 617         if (new_entry == NULL)
 618                 return NULL;
 619
 620         update_hooks(table, chain_head, new_entry);
 621
 622         /*
 623          * If the chain is builtin, and does not have any rule,
 624          * then the one that we're inserting is becoming the head
 625          * and thus needs the builtin flag.
 626          */
 627         head = chain_head->data;
 628         if (head->builtin < 0)
 629                 *builtin = -1;
 630         else if (chain_head == chain_tail->prev) {
 631                 *builtin = head->builtin;
 632                 head->builtin = -1;
 633         }
 634
 635         return new_entry;
 636 }
 637
 638 static int
 639 connman_iptables_append_rule(struct connman_iptables *table,
 640                                 struct ipt_ip *ip, char *chain_name,
 641                                 char *target_name, struct xtables_target *xt_t,
 642                                 char *match_name, struct xtables_match *xt_m)
 643 {
 644         GList *chain_tail;
 645         struct ipt_entry *new_entry;
 646         int builtin = -1, ret;
 647
 648         chain_tail = find_chain_tail(table, chain_name);
 649         if (chain_tail == NULL)
 650                 return -EINVAL;
 651
 652         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 653                         target_name, xt_t, match_name, xt_m, &builtin);
 654         if (new_entry == NULL)
 655                 return -EINVAL;
 656
 657         ret = connman_add_entry(table, new_entry, chain_tail->prev, builtin);
 658         if (ret < 0)
 659                 g_free(new_entry);
 660
 661         return ret;
 662 }
 663
 664 static int connman_iptables_insert_rule(struct connman_iptables *table,
 665                                 struct ipt_ip *ip, char *chain_name,
 666                                 char *target_name, struct xtables_target *xt_t,
 667                                 char *match_name, struct xtables_match *xt_m)
 668 {
 669         GList *chain_head;
 670         struct ipt_entry *new_entry;
 671         int builtin = -1, ret;
 672
 673         chain_head = find_chain_head(table, chain_name);
 674         if (chain_head == NULL)
 675                 return -EINVAL;
 676
 677         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 678                         target_name, xt_t, match_name, xt_m, &builtin);
 679         if (new_entry == NULL)
 680                 return -EINVAL;
 681
 682         ret = connman_add_entry(table, new_entry, chain_head->next, builtin);
 683         if (ret < 0)
 684                 g_free(new_entry);
 685
 686         return ret;
 687 }
 688
 689 static struct ipt_replace *
 690 connman_iptables_blob(struct connman_iptables *table)
 691 {
 692         struct ipt_replace *r;
 693         GList *list;
 694         struct connman_iptables_entry *e;
 695         unsigned char *entry_index;
 696
 697         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 698         if (r == NULL)
 699                 return NULL;
 700
 701         memset(r, 0, sizeof(*r) + table->size);
 702
 703         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 704                                 * table->old_entries);
 705         if (r->counters == NULL) {
 706                 g_free(r);
 707                 return NULL;
 708         }
 709
 710         strcpy(r->name, table->info->name);
 711         r->num_entries = table->num_entries;
 712         r->size = table->size;
 713
 714         r->num_counters = table->old_entries;
 715         r->valid_hooks  = table->info->valid_hooks;
 716
 717         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 718         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 719
 720         entry_index = (unsigned char *)r->entries;
 721         for (list = table->entries; list; list = list->next) {
 722                 e = list->data;
 723
 724                 memcpy(entry_index, e->entry, e->entry->next_offset);
 725                 entry_index += e->entry->next_offset;
 726         }
 727
 728         return r;
 729 }
 730
 731 static void dump_target(struct connman_iptables *table,
 732                                 struct ipt_entry *entry)
 733
 734 {
 735         struct xtables_target *xt_t;
 736         struct xt_entry_target *target;
 737
 738         target = ipt_get_target(entry);
 739
 740         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 741                 struct xt_standard_target *t;
 742
 743                 t = (struct xt_standard_target *)target;
 744
 745                 switch (t->verdict) {
 746                 case XT_RETURN:
 747                         printf("\ttarget RETURN\n");
 748                         break;
 749
 750                 case -NF_ACCEPT - 1:
 751                         printf("\ttarget ACCEPT\n");
 752                         break;
 753
 754                 case -NF_DROP - 1:
 755                         printf("\ttarget DROP\n");
 756                         break;
 757
 758                 case -NF_QUEUE - 1:
 759                         printf("\ttarget QUEUE\n");
 760                         break;
 761
 762                 case -NF_STOP - 1:
 763                         printf("\ttarget STOP\n");
 764                         break;
 765
 766                 default:
 767                         printf("\tJUMP @%p (0x%x)\n",
 768                                 (char*)table->blob_entries->entrytable +
 769                                 t->verdict, t->verdict);
 770                         break;
 771                 }
 772
 773                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 774                                                 XTF_LOAD_MUST_SUCCEED);
 775
 776                 if(xt_t->print != NULL)
 777                         xt_t->print(NULL, target, 1);
 778         } else {
 779                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 780                 if (xt_t == NULL) {
 781                         printf("\ttarget %s\n", target->u.user.name);
 782                         return;
 783                 }
 784
 785                 if(xt_t->print != NULL) {
 786                         printf("\ttarget ");
 787                         xt_t->print(NULL, target, 1);
 788                         printf("\n");
 789                 }
 790         }
 791 }
 792
 793 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 794 {
 795         struct xtables_match *xt_m;
 796         struct xt_entry_match *match;
 797
 798         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 799                 return;
 800
 801         match = (struct xt_entry_match *) entry->elems;
 802
 803         if (!strlen(match->u.user.name))
 804                 return;
 805
 806         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 807         if (xt_m == NULL)
 808                 goto out;
 809
 810         if(xt_m->print != NULL) {
 811                 printf("\tmatch ");
 812                 xt_m->print(NULL, match, 1);
 813                 printf("\n");
 814
 815                 return;
 816         }
 817
 818 out:
 819         printf("\tmatch %s\n", match->u.user.name);
 820
 821 }
 822
 823 static int connman_iptables_dump_entry(struct ipt_entry *entry,
 824                                         struct connman_iptables *table)
 825 {
 826         struct xt_entry_target *target;
 827         unsigned int offset;
 828         int builtin;
 829
 830         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 831         target = ipt_get_target(entry);
 832         builtin = is_hook_entry(table, entry);
 833
 834         if (entry_to_offset(table, entry) + entry->next_offset ==
 835                                         table->blob_entries->size) {
 836                 printf("End of CHAIN 0x%x\n", offset);
 837                 return 0;
 838         }
 839
 840         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 841                 printf("USER CHAIN (%s) %p  match %p  target %p  size %d\n",
 842                         target->data, entry, entry->elems,
 843                         (char *)entry + entry->target_offset,
 844                                 entry->next_offset);
 845
 846                 return 0;
 847         } else if (builtin >= 0) {
 848                 printf("CHAIN (%s) %p  match %p  target %p  size %d\n",
 849                         hooknames[builtin], entry, entry->elems,
 850                         (char *)entry + entry->target_offset,
 851                                 entry->next_offset);
 852         } else {
 853                 printf("RULE %p  match %p  target %p  size %d\n", entry,
 854                         entry->elems,
 855                         (char *)entry + entry->target_offset,
 856                                 entry->next_offset);
 857         }
 858
 859         dump_match(table, entry);
 860         dump_target(table, entry);
 861
 862         return 0;
 863 }
 864
 865 static void connman_iptables_dump_hook(struct connman_iptables *table)
 866 {
 867         int i;
 868         printf("hooks: \n");
 869         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 870                 if ((table->info->valid_hooks & (1 << i)))
 871                         printf("%s entry %p underflow %p (%#x)\n",
 872                                 hooknames[i],
 873                                 table->blob_entries->entrytable +
 874                                                 table->info->hook_entry[i],
 875                                 table->blob_entries->entrytable +
 876                                                 table->info->underflow[i],
 877                                         table->info->underflow[i]);
 878         }
 879 }
 880
 881 static void connman_iptables_dump(struct connman_iptables *table)
 882 {
 883         printf("%s valid_hooks=0x%08x, num_entries=%u, size=%u\n",
 884                 table->info->name,
 885                 table->info->valid_hooks, table->info->num_entries,
 886                 table->info->size);
 887
 888         connman_iptables_dump_hook(table);
 889
 890         ENTRY_ITERATE(table->blob_entries->entrytable,
 891                         table->blob_entries->size,
 892                         connman_iptables_dump_entry, table);
 893
 894 }
 895
 896 static int connman_iptables_get_entries(struct connman_iptables *table)
 897 {
 898         socklen_t entry_size;
 899
 900         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 901
 902         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 903                                 table->blob_entries, &entry_size);
 904 }
 905
 906 static int connman_iptables_replace(struct connman_iptables *table,
 907                                         struct ipt_replace *r)
 908 {
 909         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 910                          sizeof(*r) + r->size);
 911 }
 912
 913 static void connman_iptables_cleanup(struct connman_iptables *table)
 914 {
 915         GList *list;
 916         struct connman_iptables_entry *entry;
 917
 918         close(table->ipt_sock);
 919
 920         for (list = table->entries; list; list = list->next) {
 921                 entry = list->data;
 922
 923                 g_free(entry->entry);
 924         }
 925
 926         g_free(table->info);
 927         g_free(table->blob_entries);
 928         g_free(table);
 929
 930         xtables_free_opts(1);
 931 }
 932
 933 static int connman_iptables_commit(struct connman_iptables *table)
 934 {
 935         struct ipt_replace *repl;
 936
 937         repl = connman_iptables_blob(table);
 938
 939         return connman_iptables_replace(table, repl);
 940 }
 941
 942 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 943 {
 944         struct ipt_entry *new_entry;
 945         int builtin;
 946
 947         new_entry = g_try_malloc0(entry->next_offset);
 948         if (new_entry == NULL)
 949                 return -ENOMEM;
 950
 951         memcpy(new_entry, entry, entry->next_offset);
 952
 953         builtin = is_hook_entry(table, entry);
 954
 955         return connman_add_entry(table, new_entry, NULL, builtin);
 956 }
 957
 958 static struct connman_iptables *connman_iptables_init(const char *table_name)
 959 {
 960         struct connman_iptables *table;
 961         socklen_t s;
 962
 963         table =  g_try_new0(struct connman_iptables, 1);
 964         if (table == NULL)
 965                 return NULL;
 966
 967         table->info =  g_try_new0(struct ipt_getinfo, 1);
 968         if (table->info == NULL)
 969                 goto err;
 970
 971         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 972         if (table->ipt_sock < 0)
 973                 goto err;
 974
 975         s = sizeof(*table->info);
 976         strcpy(table->info->name, table_name);
 977         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 978                                                 table->info, &s) < 0)
 979                 goto err;
 980
 981         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 982                                                 table->info->size);
 983         if (table->blob_entries == NULL)
 984                 goto err;
 985
 986         strcpy(table->blob_entries->name, table_name);
 987         table->blob_entries->size = table->info->size;
 988
 989         if (connman_iptables_get_entries(table) < 0)
 990                 goto err;
 991
 992         table->num_entries = 0;
 993         table->old_entries = table->info->num_entries;
 994         table->size = 0;
 995
 996         memcpy(table->underflow, table->info->underflow,
 997                                 sizeof(table->info->underflow));
 998         memcpy(table->hook_entry, table->info->hook_entry,
 999                                 sizeof(table->info->hook_entry));
1000
1001         ENTRY_ITERATE(table->blob_entries->entrytable,
1002                         table->blob_entries->size,
1003                                 add_entry, table);
1004
1005
1006         return table;
1007
1008 err:
1009
1010         connman_iptables_cleanup(table);
1011
1012         return NULL;
1013 }
1014
1015 static struct xtables_target *prepare_target(struct connman_iptables *table,
1016                                                         char *target_name)
1017 {
1018         struct xtables_target *xt_t = NULL;
1019         gboolean is_builtin, is_user_defined;
1020         GList *chain_head = NULL;
1021         size_t target_size;
1022
1023         is_builtin = FALSE;
1024         is_user_defined = FALSE;
1025
1026         if (is_builtin_target(target_name))
1027                 is_builtin = TRUE;
1028         else {
1029                 chain_head = find_chain_head(table, target_name);
1030                 if (chain_head != NULL && chain_head->next != NULL)
1031                         is_user_defined = TRUE;
1032         }
1033
1034         if (is_builtin || is_user_defined)
1035                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1036                                                 XTF_LOAD_MUST_SUCCEED);
1037         else
1038                 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1039
1040         if (xt_t == NULL)
1041                 return NULL;
1042
1043         target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1044
1045         xt_t->t = g_try_malloc0(target_size);
1046         if (xt_t->t == NULL)
1047                 return NULL;
1048
1049         xt_t->t->u.target_size = target_size;
1050
1051         if (is_builtin || is_user_defined) {
1052                 struct xt_standard_target *target;
1053
1054                 target = (struct xt_standard_target *)(xt_t->t);
1055                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
1056
1057                 if (is_builtin == TRUE)
1058                         target->verdict = target_to_verdict(target_name);
1059                 else if (is_user_defined == TRUE) {
1060                         struct connman_iptables_entry *target_rule;
1061
1062                         if (chain_head == NULL) {
1063                                 g_free(xt_t->t);
1064                                 return NULL;
1065                         }
1066
1067                         target_rule = chain_head->next->data;
1068                         target->verdict = target_rule->offset;
1069                 }
1070         } else {
1071                 strcpy(xt_t->t->u.user.name, target_name);
1072                 xt_t->t->u.user.revision = xt_t->revision;
1073                 if (xt_t->init != NULL)
1074                         xt_t->init(xt_t->t);
1075         }
1076
1077         return xt_t;
1078 }
1079
1080 static struct option connman_iptables_opts[] = {
1081         {.name = "append",        .has_arg = 1, .val = 'A'},
1082         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
1083         {.name = "insert",        .has_arg = 1, .val = 'I'},
1084         {.name = "list",          .has_arg = 2, .val = 'L'},
1085         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
1086         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
1087         {.name = "destination",   .has_arg = 1, .val = 'd'},
1088         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
1089         {.name = "jump",          .has_arg = 1, .val = 'j'},
1090         {.name = "match",         .has_arg = 1, .val = 'm'},
1091         {.name = "out-interface", .has_arg = 1, .val = 'o'},
1092         {.name = "source",        .has_arg = 1, .val = 's'},
1093         {.name = "table",         .has_arg = 1, .val = 't'},
1094         {NULL},
1095 };
1096
1097 struct xtables_globals connman_iptables_globals = {
1098         .option_offset = 0,
1099         .opts = connman_iptables_opts,
1100         .orig_opts = connman_iptables_opts,
1101 };
1102
1103 int main(int argc, char *argv[])
1104 {
1105         struct connman_iptables *table;
1106         struct xtables_match *xt_m;
1107         struct xtables_target *xt_t;
1108         struct ipt_ip ip;
1109         char *table_name, *chain, *new_chain, *match_name, *target_name;
1110         char *delete_chain, *flush_chain;
1111         int c, in_len, out_len;
1112         size_t size;
1113         gboolean dump, invert, delete, insert;
1114         struct in_addr src, dst;
1115
1116         xtables_init_all(&connman_iptables_globals, NFPROTO_IPV4);
1117
1118         dump = FALSE;
1119         invert = FALSE;
1120         delete = FALSE;
1121         insert = FALSE;
1122         table_name = chain = new_chain = match_name = target_name = NULL;
1123         delete_chain = flush_chain = NULL;
1124         memset(&ip, 0, sizeof(struct ipt_ip));
1125         table = NULL;
1126         xt_m = NULL;
1127         xt_t = NULL;
1128
1129         while ((c = getopt_long(argc, argv, "-A:F:I:L::N:X:d:i:j:m:o:s:t:",
1130                                 connman_iptables_globals.opts, NULL)) != -1) {
1131                 switch (c) {
1132                 case 'A':
1133                         /* It is either -A, -D or -I at once */
1134                         if (chain)
1135                                 goto out;
1136
1137                         chain = optarg;
1138                         break;
1139
1140                 case 'F':
1141                         flush_chain = optarg;
1142                         break;
1143
1144                 case 'I':
1145                         /* It is either -A, -D or -I at once */
1146                         if (chain)
1147                                 goto out;
1148
1149                         chain = optarg;
1150                         insert = TRUE;
1151                         break;
1152
1153                 case 'L':
1154                         dump = true;
1155                         break;
1156
1157                 case 'N':
1158                         new_chain = optarg;
1159                         break;
1160
1161                 case 'X':
1162                         delete = true;
1163                         delete_chain = optarg;
1164                         break;
1165
1166                 case 'd':
1167                         if (!inet_pton(AF_INET, optarg, &dst))
1168                                 break;
1169
1170                         ip.dst = dst;
1171                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1172
1173                         if (invert)
1174                                 ip.invflags |= IPT_INV_DSTIP;
1175
1176                         break;
1177
1178                 case 'i':
1179                         in_len = strlen(optarg);
1180
1181                         if (in_len + 1 > IFNAMSIZ)
1182                                 break;
1183
1184                         strcpy(ip.iniface, optarg);
1185                         memset(ip.iniface_mask, 0xff, in_len + 1);
1186
1187                         if (invert)
1188                                 ip.invflags |= IPT_INV_VIA_IN;
1189
1190                         break;
1191
1192                 case 'j':
1193                         target_name = optarg;
1194                         break;
1195
1196                 case 'm':
1197                         match_name = optarg;
1198
1199                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1200                         size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
1201                         xt_m->m = g_try_malloc0(size);
1202                         if (xt_m == NULL)
1203                                 goto out;
1204                         xt_m->m->u.match_size = size;
1205                         strcpy(xt_m->m->u.user.name, xt_m->name);
1206                         xt_m->m->u.user.revision = xt_m->revision;
1207                         if (xt_m->init != NULL)
1208                                 xt_m->init(xt_m->m);
1209                         if (xt_m != xt_m->next) {
1210                                 connman_iptables_globals.opts =
1211                                         xtables_merge_options(
1212 #if XTABLES_VERSION_CODE > 5
1213                                                 connman_iptables_globals.orig_opts,
1214 #endif
1215                                                 connman_iptables_globals.opts,
1216                                                 xt_m->extra_opts,
1217                                                 &xt_m->option_offset);
1218                                 if (connman_iptables_globals.opts == NULL)
1219                                         goto out;
1220                         }
1221
1222                         break;
1223
1224                 case 'o':
1225                         out_len = strlen(optarg);
1226
1227                         if (out_len + 1 > IFNAMSIZ)
1228                                 break;
1229
1230                         strcpy(ip.outiface, optarg);
1231                         memset(ip.outiface_mask, 0xff, out_len + 1);
1232
1233                         if (invert)
1234                                 ip.invflags |= IPT_INV_VIA_OUT;
1235
1236                         break;
1237
1238                 case 's':
1239                         if (!inet_pton(AF_INET, optarg, &src))
1240                                 break;
1241
1242                         ip.src = src;
1243                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1244
1245                         if (invert)
1246                                 ip.invflags |= IPT_INV_SRCIP;
1247
1248                         break;
1249
1250                 case 't':
1251                         table_name = optarg;
1252                         break;
1253
1254                 case 1:
1255                         if (optarg[0] == '!' && optarg[1] == '\0') {
1256                                 if (invert)
1257                                         printf("Consecutive ! not allowed\n");
1258
1259                                 invert = TRUE;
1260                                 optarg[0] = '\0';
1261                                 continue;
1262                         }
1263
1264                         printf("Invalid option\n");
1265
1266                         return -1;
1267
1268                 default:
1269                         if (xt_t == NULL || xt_t->parse == NULL ||
1270                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1271                                         &xt_t->tflags, NULL, &xt_t->t)) {
1272                                 if (xt_m == NULL || xt_m->parse == NULL)
1273                                         break;
1274
1275                                 xt_m->parse(c - xt_m->option_offset, argv,
1276                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1277                         }
1278
1279                         break;
1280                 }
1281         }
1282
1283         if (table_name == NULL)
1284                 table_name = "filter";
1285
1286         table = connman_iptables_init(table_name);
1287         if (table == NULL)
1288                 return -1;
1289
1290         if (delete) {
1291                 if (delete_chain == NULL)
1292                         goto out;
1293
1294                 printf("Delete chain %s\n", delete_chain);
1295
1296                 connman_iptables_delete_chain(table, delete_chain);
1297
1298                 goto commit;
1299         }
1300
1301         if (flush_chain) {
1302                 printf("Flush chain %s\n", flush_chain);
1303
1304                 connman_iptables_flush_chain(table, flush_chain);
1305
1306                 goto commit;
1307         }
1308
1309         if (dump) {
1310                 connman_iptables_dump(table);
1311
1312                 return 0;
1313         }
1314
1315         if (chain && new_chain)
1316                 return -1;
1317
1318         if (new_chain) {
1319                 printf("New chain %s\n", new_chain);
1320
1321                 connman_iptables_add_chain(table, new_chain);
1322
1323                 goto commit;
1324         }
1325
1326         if (chain) {
1327                 xt_t = prepare_target(table, target_name);
1328                 if (xt_t == NULL)
1329                         goto out;
1330
1331                 connman_iptables_globals.opts =
1332                         xtables_merge_options(
1333 #if XTABLES_VERSION_CODE > 5
1334                                         connman_iptables_globals.orig_opts,
1335 #endif
1336                                         connman_iptables_globals.opts,
1337                                         xt_t->extra_opts,
1338                                         &xt_t->option_offset);
1339                 if (connman_iptables_globals.opts == NULL)
1340                         goto out;
1341
1342                 if (insert == TRUE) {
1343                         printf("Inserting %s to %s (match %s)\n", target_name,
1344                                         chain, match_name);
1345
1346                         connman_iptables_insert_rule(table, &ip, chain,
1347                                         target_name, xt_t, match_name, xt_m);
1348                 } else {
1349                         printf("Appending %s to %s (match %s)\n", target_name,
1350                                         chain, match_name);
1351
1352                         connman_iptables_append_rule(table, &ip, chain,
1353                                 target_name, xt_t, match_name, xt_m);
1354                 }
1355         }
1356
1357 commit:
1358
1359         connman_iptables_commit(table);
1360
1361 out:
1362         connman_iptables_cleanup(table);
1363
1364         if (xt_t)
1365                 g_free(xt_t->t);
1366
1367         if (xt_m)
1368                 g_free(xt_m->m);
1369
1370         return 0;
1371 }