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 connman_iptables *table, struct ipt_ip *ip,
 516                 char *target_name, 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         int is_builtin = is_builtin_target(target_name);
 522
 523         if (xt_m)
 524                 match_size = xt_m->m->u.match_size;
 525         else
 526                 match_size = 0;
 527
 528         if (xt_t)
 529                 target_size = ALIGN(xt_t->t->u.target_size);
 530         else
 531                 target_size = ALIGN(sizeof(struct xt_standard_target));
 532
 533         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 534                                                                 match_size);
 535         if (new_entry == NULL)
 536                 return NULL;
 537
 538         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 539
 540         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 541         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 542                                                                 match_size;
 543         if (xt_m) {
 544                 struct xt_entry_match *entry_match;
 545
 546                 entry_match = (struct xt_entry_match *)new_entry->elems;
 547                 memcpy(entry_match, xt_m->m, match_size);
 548         }
 549
 550         if (xt_t) {
 551                 struct xt_entry_target *entry_target;
 552
 553                 if (is_builtin) {
 554                         struct xt_standard_target *target;
 555
 556                         target = (struct xt_standard_target *)(xt_t->t);
 557                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 558                         target->verdict = target_to_verdict(target_name);
 559                 }
 560
 561                 entry_target = ipt_get_target(new_entry);
 562                 memcpy(entry_target, xt_t->t, target_size);
 563         } else {
 564                 struct connman_iptables_entry *target_rule;
 565                 struct xt_standard_target *target;
 566                 GList *chain_head;
 567
 568                 /*
 569                  * This is a user defined target, i.e. a chain jump.
 570                  * We search for the chain head, and the target verdict
 571                  * is the first rule's offset on this chain.
 572                  * The offset is from the beginning of the table.
 573                  */
 574
 575                 chain_head = find_chain_head(table, target_name);
 576                 if (chain_head == NULL || chain_head->next == NULL) {
 577                         g_free(new_entry);
 578                         return NULL;
 579                 }
 580
 581                 target_rule = chain_head->next->data;
 582
 583                 target = (struct xt_standard_target *)ipt_get_target(new_entry);
 584                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 585                 target->target.u.user.target_size = target_size;
 586                 target->verdict = target_rule->offset;
 587         }
 588
 589         return new_entry;
 590 }
 591
 592 static void update_hooks(struct connman_iptables *table, GList *chain_head,
 593                                 struct ipt_entry *entry)
 594 {
 595         GList *list;
 596         struct connman_iptables_entry *head, *e;
 597         int builtin;
 598
 599         if (chain_head == NULL)
 600                 return;
 601
 602         head = chain_head->data;
 603
 604         builtin = head->builtin;
 605         if (builtin < 0)
 606                 return;
 607
 608         table->underflow[builtin] += entry->next_offset;
 609
 610         for (list = chain_head->next; list; list = list->next) {
 611                 e = list->data;
 612
 613                 builtin = e->builtin;
 614                 if (builtin < 0)
 615                         continue;
 616
 617                 table->hook_entry[builtin] += entry->next_offset;
 618                 table->underflow[builtin] += entry->next_offset;
 619         }
 620 }
 621
 622 static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
 623                                 struct ipt_ip *ip, char *chain_name,
 624                                 char *target_name, struct xtables_target *xt_t,
 625                                 char *match_name, struct xtables_match *xt_m,
 626                                 int *builtin)
 627 {
 628         GList *chain_tail, *chain_head;
 629         struct ipt_entry *new_entry;
 630         struct connman_iptables_entry *head;
 631
 632         chain_head = find_chain_head(table, chain_name);
 633         if (chain_head == NULL)
 634                 return NULL;
 635
 636         chain_tail = find_chain_tail(table, chain_name);
 637         if (chain_tail == NULL)
 638                 return NULL;
 639
 640         new_entry = new_rule(table, ip, target_name, xt_t, match_name, xt_m);
 641         if (new_entry == NULL)
 642                 return NULL;
 643
 644         update_hooks(table, chain_head, new_entry);
 645
 646         /*
 647          * If the chain is builtin, and does not have any rule,
 648          * then the one that we're inserting is becoming the head
 649          * and thus needs the builtin flag.
 650          */
 651         head = chain_head->data;
 652         if (head->builtin < 0)
 653                 *builtin = -1;
 654         else if (chain_head == chain_tail->prev) {
 655                 *builtin = head->builtin;
 656                 head->builtin = -1;
 657         }
 658
 659         return new_entry;
 660 }
 661
 662 static int
 663 connman_iptables_append_rule(struct connman_iptables *table,
 664                                 struct ipt_ip *ip, char *chain_name,
 665                                 char *target_name, struct xtables_target *xt_t,
 666                                 char *match_name, struct xtables_match *xt_m)
 667 {
 668         GList *chain_tail;
 669         struct ipt_entry *new_entry;
 670         int builtin = -1, ret;
 671
 672         chain_tail = find_chain_tail(table, chain_name);
 673         if (chain_tail == NULL)
 674                 return -EINVAL;
 675
 676         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 677                         target_name, xt_t, match_name, xt_m, &builtin);
 678         if (new_entry == NULL)
 679                 return -EINVAL;
 680
 681         ret = connman_add_entry(table, new_entry, chain_tail->prev, builtin);
 682         if (ret < 0)
 683                 g_free(new_entry);
 684
 685         return ret;
 686 }
 687
 688 static int connman_iptables_insert_rule(struct connman_iptables *table,
 689                                 struct ipt_ip *ip, char *chain_name,
 690                                 char *target_name, struct xtables_target *xt_t,
 691                                 char *match_name, struct xtables_match *xt_m)
 692 {
 693         GList *chain_head;
 694         struct ipt_entry *new_entry;
 695         int builtin = -1, ret;
 696
 697         chain_head = find_chain_head(table, chain_name);
 698         if (chain_head == NULL)
 699                 return -EINVAL;
 700
 701         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 702                         target_name, xt_t, match_name, xt_m, &builtin);
 703         if (new_entry == NULL)
 704                 return -EINVAL;
 705
 706         ret = connman_add_entry(table, new_entry, chain_head->next, builtin);
 707         if (ret < 0)
 708                 g_free(new_entry);
 709
 710         return ret;
 711 }
 712
 713 static struct ipt_replace *
 714 connman_iptables_blob(struct connman_iptables *table)
 715 {
 716         struct ipt_replace *r;
 717         GList *list;
 718         struct connman_iptables_entry *e;
 719         unsigned char *entry_index;
 720
 721         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 722         if (r == NULL)
 723                 return NULL;
 724
 725         memset(r, 0, sizeof(*r) + table->size);
 726
 727         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 728                                 * table->old_entries);
 729         if (r->counters == NULL) {
 730                 g_free(r);
 731                 return NULL;
 732         }
 733
 734         strcpy(r->name, table->info->name);
 735         r->num_entries = table->num_entries;
 736         r->size = table->size;
 737
 738         r->num_counters = table->old_entries;
 739         r->valid_hooks  = table->info->valid_hooks;
 740
 741         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 742         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 743
 744         entry_index = (unsigned char *)r->entries;
 745         for (list = table->entries; list; list = list->next) {
 746                 e = list->data;
 747
 748                 memcpy(entry_index, e->entry, e->entry->next_offset);
 749                 entry_index += e->entry->next_offset;
 750         }
 751
 752         return r;
 753 }
 754
 755 static void dump_target(struct connman_iptables *table,
 756                                 struct ipt_entry *entry)
 757
 758 {
 759         struct xtables_target *xt_t;
 760         struct xt_entry_target *target;
 761
 762         target = ipt_get_target(entry);
 763
 764         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 765                 struct xt_standard_target *t;
 766
 767                 t = (struct xt_standard_target *)target;
 768
 769                 switch (t->verdict) {
 770                 case XT_RETURN:
 771                         printf("\ttarget RETURN\n");
 772                         break;
 773
 774                 case -NF_ACCEPT - 1:
 775                         printf("\ttarget ACCEPT\n");
 776                         break;
 777
 778                 case -NF_DROP - 1:
 779                         printf("\ttarget DROP\n");
 780                         break;
 781
 782                 case -NF_QUEUE - 1:
 783                         printf("\ttarget QUEUE\n");
 784                         break;
 785
 786                 case -NF_STOP - 1:
 787                         printf("\ttarget STOP\n");
 788                         break;
 789
 790                 default:
 791                         printf("\tJUMP @%p (0x%x)\n",
 792                                 (char*)table->blob_entries->entrytable +
 793                                 t->verdict, t->verdict);
 794                         break;
 795                 }
 796
 797                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 798                                                 XTF_LOAD_MUST_SUCCEED);
 799
 800                 if(xt_t->print != NULL)
 801                         xt_t->print(NULL, target, 1);
 802         } else {
 803                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 804                 if (xt_t == NULL) {
 805                         printf("\ttarget %s\n", target->u.user.name);
 806                         return;
 807                 }
 808
 809                 if(xt_t->print != NULL) {
 810                         printf("\ttarget ");
 811                         xt_t->print(NULL, target, 1);
 812                         printf("\n");
 813                 }
 814         }
 815 }
 816
 817 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 818 {
 819         struct xtables_match *xt_m;
 820         struct xt_entry_match *match;
 821
 822         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 823                 return;
 824
 825         match = (struct xt_entry_match *) entry->elems;
 826
 827         if (!strlen(match->u.user.name))
 828                 return;
 829
 830         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 831         if (xt_m == NULL)
 832                 goto out;
 833
 834         if(xt_m->print != NULL) {
 835                 printf("\tmatch ");
 836                 xt_m->print(NULL, match, 1);
 837                 printf("\n");
 838
 839                 return;
 840         }
 841
 842 out:
 843         printf("\tmatch %s\n", match->u.user.name);
 844
 845 }
 846
 847 static int connman_iptables_dump_entry(struct ipt_entry *entry,
 848                                         struct connman_iptables *table)
 849 {
 850         struct xt_entry_target *target;
 851         unsigned int offset;
 852         int builtin;
 853
 854         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 855         target = ipt_get_target(entry);
 856         builtin = is_hook_entry(table, entry);
 857
 858         if (entry_to_offset(table, entry) + entry->next_offset ==
 859                                         table->blob_entries->size) {
 860                 printf("End of CHAIN 0x%x\n", offset);
 861                 return 0;
 862         }
 863
 864         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 865                 printf("USER CHAIN (%s) %p  match %p  target %p  size %d\n",
 866                         target->data, entry, entry->elems,
 867                         (char *)entry + entry->target_offset,
 868                                 entry->next_offset);
 869
 870                 return 0;
 871         } else if (builtin >= 0) {
 872                 printf("CHAIN (%s) %p  match %p  target %p  size %d\n",
 873                         hooknames[builtin], entry, entry->elems,
 874                         (char *)entry + entry->target_offset,
 875                                 entry->next_offset);
 876         } else {
 877                 printf("RULE %p  match %p  target %p  size %d\n", entry,
 878                         entry->elems,
 879                         (char *)entry + entry->target_offset,
 880                                 entry->next_offset);
 881         }
 882
 883         dump_match(table, entry);
 884         dump_target(table, entry);
 885
 886         return 0;
 887 }
 888
 889 static void connman_iptables_dump_hook(struct connman_iptables *table)
 890 {
 891         int i;
 892         printf("hooks: \n");
 893         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 894                 if ((table->info->valid_hooks & (1 << i)))
 895                         printf("%s entry %p underflow %p (%#x)\n",
 896                                 hooknames[i],
 897                                 table->blob_entries->entrytable +
 898                                                 table->info->hook_entry[i],
 899                                 table->blob_entries->entrytable +
 900                                                 table->info->underflow[i],
 901                                         table->info->underflow[i]);
 902         }
 903 }
 904
 905 static void connman_iptables_dump(struct connman_iptables *table)
 906 {
 907         printf("%s valid_hooks=0x%08x, num_entries=%u, size=%u\n",
 908                 table->info->name,
 909                 table->info->valid_hooks, table->info->num_entries,
 910                 table->info->size);
 911
 912         connman_iptables_dump_hook(table);
 913
 914         ENTRY_ITERATE(table->blob_entries->entrytable,
 915                         table->blob_entries->size,
 916                         connman_iptables_dump_entry, table);
 917
 918 }
 919
 920 static int connman_iptables_get_entries(struct connman_iptables *table)
 921 {
 922         socklen_t entry_size;
 923
 924         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 925
 926         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 927                                 table->blob_entries, &entry_size);
 928 }
 929
 930 static int connman_iptables_replace(struct connman_iptables *table,
 931                                         struct ipt_replace *r)
 932 {
 933         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 934                          sizeof(*r) + r->size);
 935 }
 936
 937 static void connman_iptables_cleanup(struct connman_iptables *table)
 938 {
 939         GList *list;
 940         struct connman_iptables_entry *entry;
 941
 942         close(table->ipt_sock);
 943
 944         for (list = table->entries; list; list = list->next) {
 945                 entry = list->data;
 946
 947                 g_free(entry->entry);
 948         }
 949
 950         g_free(table->info);
 951         g_free(table->blob_entries);
 952         g_free(table);
 953
 954         xtables_free_opts(1);
 955 }
 956
 957 static int connman_iptables_commit(struct connman_iptables *table)
 958 {
 959         struct ipt_replace *repl;
 960
 961         repl = connman_iptables_blob(table);
 962
 963         return connman_iptables_replace(table, repl);
 964 }
 965
 966 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 967 {
 968         struct ipt_entry *new_entry;
 969         int builtin;
 970
 971         new_entry = g_try_malloc0(entry->next_offset);
 972         if (new_entry == NULL)
 973                 return -ENOMEM;
 974
 975         memcpy(new_entry, entry, entry->next_offset);
 976
 977         builtin = is_hook_entry(table, entry);
 978
 979         return connman_add_entry(table, new_entry, NULL, builtin);
 980 }
 981
 982 static struct connman_iptables *connman_iptables_init(const char *table_name)
 983 {
 984         struct connman_iptables *table;
 985         socklen_t s;
 986
 987         table =  g_try_new0(struct connman_iptables, 1);
 988         if (table == NULL)
 989                 return NULL;
 990
 991         table->info =  g_try_new0(struct ipt_getinfo, 1);
 992         if (table->info == NULL)
 993                 goto err;
 994
 995         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 996         if (table->ipt_sock < 0)
 997                 goto err;
 998
 999         s = sizeof(*table->info);
1000         strcpy(table->info->name, table_name);
1001         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
1002                                                 table->info, &s) < 0)
1003                 goto err;
1004
1005         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
1006                                                 table->info->size);
1007         if (table->blob_entries == NULL)
1008                 goto err;
1009
1010         strcpy(table->blob_entries->name, table_name);
1011         table->blob_entries->size = table->info->size;
1012
1013         if (connman_iptables_get_entries(table) < 0)
1014                 goto err;
1015
1016         table->num_entries = 0;
1017         table->old_entries = table->info->num_entries;
1018         table->size = 0;
1019
1020         memcpy(table->underflow, table->info->underflow,
1021                                 sizeof(table->info->underflow));
1022         memcpy(table->hook_entry, table->info->hook_entry,
1023                                 sizeof(table->info->hook_entry));
1024
1025         ENTRY_ITERATE(table->blob_entries->entrytable,
1026                         table->blob_entries->size,
1027                                 add_entry, table);
1028
1029
1030         return table;
1031
1032 err:
1033
1034         connman_iptables_cleanup(table);
1035
1036         return NULL;
1037 }
1038
1039
1040 static struct option connman_iptables_opts[] = {
1041         {.name = "append",        .has_arg = 1, .val = 'A'},
1042         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
1043         {.name = "insert",        .has_arg = 1, .val = 'I'},
1044         {.name = "list",          .has_arg = 2, .val = 'L'},
1045         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
1046         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
1047         {.name = "destination",   .has_arg = 1, .val = 'd'},
1048         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
1049         {.name = "jump",          .has_arg = 1, .val = 'j'},
1050         {.name = "match",         .has_arg = 1, .val = 'm'},
1051         {.name = "out-interface", .has_arg = 1, .val = 'o'},
1052         {.name = "source",        .has_arg = 1, .val = 's'},
1053         {.name = "table",         .has_arg = 1, .val = 't'},
1054         {NULL},
1055 };
1056
1057 struct xtables_globals connman_iptables_globals = {
1058         .option_offset = 0,
1059         .opts = connman_iptables_opts,
1060         .orig_opts = connman_iptables_opts,
1061 };
1062
1063 int main(int argc, char *argv[])
1064 {
1065         struct connman_iptables *table;
1066         struct xtables_match *xt_m;
1067         struct xtables_target *xt_t;
1068         struct ipt_ip ip;
1069         char *table_name, *chain, *new_chain, *match_name, *target_name;
1070         char *delete_chain, *flush_chain;
1071         int c, in_len, out_len;
1072         size_t size;
1073         gboolean dump, invert, delete, insert;
1074         struct in_addr src, dst;
1075
1076         xtables_init_all(&connman_iptables_globals, NFPROTO_IPV4);
1077
1078         dump = FALSE;
1079         invert = FALSE;
1080         delete = FALSE;
1081         insert = FALSE;
1082         table_name = chain = new_chain = match_name = target_name = NULL;
1083         delete_chain = flush_chain = NULL;
1084         memset(&ip, 0, sizeof(struct ipt_ip));
1085         table = NULL;
1086         xt_m = NULL;
1087         xt_t = NULL;
1088
1089         while ((c = getopt_long(argc, argv, "-A:F:I:L::N:X:d:i:j:m:o:s:t:",
1090                                 connman_iptables_globals.opts, NULL)) != -1) {
1091                 switch (c) {
1092                 case 'A':
1093                         /* It is either -A, -D or -I at once */
1094                         if (chain)
1095                                 goto out;
1096
1097                         chain = optarg;
1098                         break;
1099
1100                 case 'F':
1101                         flush_chain = optarg;
1102                         break;
1103
1104                 case 'I':
1105                         /* It is either -A, -D or -I at once */
1106                         if (chain)
1107                                 goto out;
1108
1109                         chain = optarg;
1110                         insert = TRUE;
1111                         break;
1112
1113                 case 'L':
1114                         dump = true;
1115                         break;
1116
1117                 case 'N':
1118                         new_chain = optarg;
1119                         break;
1120
1121                 case 'X':
1122                         delete = true;
1123                         delete_chain = optarg;
1124                         break;
1125
1126                 case 'd':
1127                         if (!inet_pton(AF_INET, optarg, &dst))
1128                                 break;
1129
1130                         ip.dst = dst;
1131                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1132
1133                         if (invert)
1134                                 ip.invflags |= IPT_INV_DSTIP;
1135
1136                         break;
1137
1138                 case 'i':
1139                         in_len = strlen(optarg);
1140
1141                         if (in_len + 1 > IFNAMSIZ)
1142                                 break;
1143
1144                         strcpy(ip.iniface, optarg);
1145                         memset(ip.iniface_mask, 0xff, in_len + 1);
1146
1147                         if (invert)
1148                                 ip.invflags |= IPT_INV_VIA_IN;
1149
1150                         break;
1151
1152                 case 'j':
1153                         target_name = optarg;
1154                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1155
1156                         if (xt_t == NULL)
1157                                 break;
1158
1159                         size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1160
1161                         xt_t->t = g_try_malloc0(size);
1162                         if (xt_t->t == NULL)
1163                                 goto out;
1164                         xt_t->t->u.target_size = size;
1165                         strcpy(xt_t->t->u.user.name, target_name);
1166                         xt_t->t->u.user.revision = xt_t->revision;
1167                         if (xt_t->init != NULL)
1168                                 xt_t->init(xt_t->t);
1169                         connman_iptables_globals.opts =
1170                                 xtables_merge_options(
1171 #if XTABLES_VERSION_CODE > 5
1172                                                      connman_iptables_globals.orig_opts,
1173 #endif
1174                                                      connman_iptables_globals.opts,
1175                                                      xt_t->extra_opts,
1176                                                      &xt_t->option_offset);
1177                         if (connman_iptables_globals.opts == NULL)
1178                                 goto out;
1179
1180                         break;
1181
1182                 case 'm':
1183                         match_name = optarg;
1184
1185                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1186                         size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
1187                         xt_m->m = g_try_malloc0(size);
1188                         if (xt_m == NULL)
1189                                 goto out;
1190                         xt_m->m->u.match_size = size;
1191                         strcpy(xt_m->m->u.user.name, xt_m->name);
1192                         xt_m->m->u.user.revision = xt_m->revision;
1193                         if (xt_m->init != NULL)
1194                                 xt_m->init(xt_m->m);
1195                         if (xt_m != xt_m->next) {
1196                                 connman_iptables_globals.opts =
1197                                         xtables_merge_options(
1198 #if XTABLES_VERSION_CODE > 5
1199                                                 connman_iptables_globals.orig_opts,
1200 #endif
1201                                                 connman_iptables_globals.opts,
1202                                                 xt_m->extra_opts,
1203                                                 &xt_m->option_offset);
1204                                 if (connman_iptables_globals.opts == NULL)
1205                                         goto out;
1206                         }
1207
1208                         break;
1209
1210                 case 'o':
1211                         out_len = strlen(optarg);
1212
1213                         if (out_len + 1 > IFNAMSIZ)
1214                                 break;
1215
1216                         strcpy(ip.outiface, optarg);
1217                         memset(ip.outiface_mask, 0xff, out_len + 1);
1218
1219                         if (invert)
1220                                 ip.invflags |= IPT_INV_VIA_OUT;
1221
1222                         break;
1223
1224                 case 's':
1225                         if (!inet_pton(AF_INET, optarg, &src))
1226                                 break;
1227
1228                         ip.src = src;
1229                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1230
1231                         if (invert)
1232                                 ip.invflags |= IPT_INV_SRCIP;
1233
1234                         break;
1235
1236                 case 't':
1237                         table_name = optarg;
1238                         break;
1239
1240                 case 1:
1241                         if (optarg[0] == '!' && optarg[1] == '\0') {
1242                                 if (invert)
1243                                         printf("Consecutive ! not allowed\n");
1244
1245                                 invert = TRUE;
1246                                 optarg[0] = '\0';
1247                                 continue;
1248                         }
1249
1250                         printf("Invalid option\n");
1251
1252                         return -1;
1253
1254                 default:
1255                         if (xt_t == NULL || xt_t->parse == NULL ||
1256                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1257                                         &xt_t->tflags, NULL, &xt_t->t)) {
1258                                 if (xt_m == NULL || xt_m->parse == NULL)
1259                                         break;
1260
1261                                 xt_m->parse(c - xt_m->option_offset, argv,
1262                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1263                         }
1264
1265                         break;
1266                 }
1267         }
1268
1269         if (table_name == NULL)
1270                 table_name = "filter";
1271
1272         table = connman_iptables_init(table_name);
1273         if (table == NULL)
1274                 return -1;
1275
1276         if (delete) {
1277                 if (delete_chain == NULL)
1278                         goto out;
1279
1280                 printf("Delete chain %s\n", delete_chain);
1281
1282                 connman_iptables_delete_chain(table, delete_chain);
1283
1284                 goto commit;
1285         }
1286
1287         if (flush_chain) {
1288                 printf("Flush chain %s\n", flush_chain);
1289
1290                 connman_iptables_flush_chain(table, flush_chain);
1291
1292                 goto commit;
1293         }
1294
1295         if (dump) {
1296                 connman_iptables_dump(table);
1297
1298                 return 0;
1299         }
1300
1301         if (chain && new_chain)
1302                 return -1;
1303
1304         if (new_chain) {
1305                 printf("New chain %s\n", new_chain);
1306
1307                 connman_iptables_add_chain(table, new_chain);
1308
1309                 goto commit;
1310         }
1311
1312         if (chain) {
1313                 if (target_name == NULL)
1314                         return -1;
1315
1316                 if (insert == TRUE) {
1317                         printf("Inserting %s to %s (match %s)\n", target_name,
1318                                         chain, match_name);
1319
1320                         connman_iptables_insert_rule(table, &ip, chain,
1321                                         target_name, xt_t, match_name, xt_m);
1322                 } else {
1323                         printf("Appending %s to %s (match %s)\n", target_name,
1324                                         chain, match_name);
1325
1326                         connman_iptables_append_rule(table, &ip, chain,
1327                                 target_name, xt_t, match_name, xt_m);
1328                 }
1329         }
1330
1331 commit:
1332
1333         connman_iptables_commit(table);
1334
1335 out:
1336         connman_iptables_cleanup(table);
1337
1338         if (xt_t)
1339                 g_free(xt_t->t);
1340
1341         if (xt_m)
1342                 g_free(xt_m->m);
1343
1344         return 0;
1345 }