src/iptables.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2011  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <getopt.h>
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/errno.h>
  32 #include <sys/socket.h>
  33 #include <xtables.h>
  34
  35 #include <linux/netfilter_ipv4/ip_tables.h>
  36
  37 #include "connman.h"
  38
  39
  40 static const char *hooknames[] = {
  41         [NF_IP_PRE_ROUTING]     = "PREROUTING",
  42         [NF_IP_LOCAL_IN]        = "INPUT",
  43         [NF_IP_FORWARD]         = "FORWARD",
  44         [NF_IP_LOCAL_OUT]       = "OUTPUT",
  45         [NF_IP_POST_ROUTING]    = "POSTROUTING",
  46 };
  47
  48 #define LABEL_ACCEPT  "ACCEPT"
  49 #define LABEL_DROP    "DROP"
  50 #define LABEL_QUEUE   "QUEUE"
  51 #define LABEL_RETURN  "RETURN"
  52
  53 #define XT_OPTION_OFFSET_SCALE 256
  54
  55 /* fn returns 0 to continue iteration */
  56 #define _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
  57 ({                                                              \
  58         unsigned int __i;                                       \
  59         int __n;                                                \
  60         int __ret = 0;                                          \
  61         type *__entry;                                          \
  62                                                                 \
  63         for (__i = 0, __n = 0; __i < (size);                    \
  64              __i += __entry->next_offset, __n++) {              \
  65                 __entry = (void *)(entries) + __i;              \
  66                 if (__n < n)                                    \
  67                         continue;                               \
  68                                                                 \
  69                 __ret = fn(__entry,  ## args);                  \
  70                 if (__ret != 0)                                 \
  71                         break;                                  \
  72         }                                                       \
  73         __ret;                                                  \
  74 })
  75
  76 /* fn returns 0 to continue iteration */
  77 #define _XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
  78         _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
  79
  80 #define ENTRY_ITERATE(entries, size, fn, args...) \
  81         _XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
  82
  83 #define MIN_ALIGN (__alignof__(struct ipt_entry))
  84
  85 #define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
  86
  87 struct error_target {
  88         struct xt_entry_target t;
  89         char error[IPT_TABLE_MAXNAMELEN];
  90 };
  91
  92 struct connman_iptables_entry {
  93         int offset;
  94         int builtin;
  95
  96         struct ipt_entry *entry;
  97 };
  98
  99 struct connman_iptables {
 100         int ipt_sock;
 101
 102         struct ipt_getinfo *info;
 103         struct ipt_get_entries *blob_entries;
 104
 105         unsigned int num_entries;
 106         unsigned int old_entries;
 107         unsigned int size;
 108
 109         unsigned int underflow[NF_INET_NUMHOOKS];
 110         unsigned int hook_entry[NF_INET_NUMHOOKS];
 111
 112         GList *entries;
 113 };
 114
 115 static GHashTable *table_hash = NULL;
 116
 117 static struct ipt_entry *get_entry(struct connman_iptables *table,
 118                                         unsigned int offset)
 119 {
 120         return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
 121                                                                         offset);
 122 }
 123
 124 static int is_hook_entry(struct connman_iptables *table,
 125                                 struct ipt_entry *entry)
 126 {
 127         unsigned int i;
 128
 129         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 130                 if ((table->info->valid_hooks & (1 << i))
 131                 && get_entry(table, table->info->hook_entry[i]) == entry)
 132                         return i;
 133         }
 134
 135         return -1;
 136 }
 137
 138 static unsigned long entry_to_offset(struct connman_iptables *table,
 139                                         struct ipt_entry *entry)
 140 {
 141         return (void *)entry - (void *)table->blob_entries->entrytable;
 142 }
 143
 144 static int target_to_verdict(char *target_name)
 145 {
 146         if (!strcmp(target_name, LABEL_ACCEPT))
 147                 return -NF_ACCEPT - 1;
 148
 149         if (!strcmp(target_name, LABEL_DROP))
 150                 return -NF_DROP - 1;
 151
 152         if (!strcmp(target_name, LABEL_QUEUE))
 153                 return -NF_QUEUE - 1;
 154
 155         if (!strcmp(target_name, LABEL_RETURN))
 156                 return XT_RETURN;
 157
 158         return 0;
 159 }
 160
 161 static gboolean is_builtin_target(char *target_name)
 162 {
 163         if (!strcmp(target_name, LABEL_ACCEPT) ||
 164                 !strcmp(target_name, LABEL_DROP) ||
 165                 !strcmp(target_name, LABEL_QUEUE) ||
 166                 !strcmp(target_name, LABEL_RETURN))
 167                 return TRUE;
 168
 169         return FALSE;
 170 }
 171
 172 static gboolean is_jump(struct connman_iptables_entry *e)
 173 {
 174         struct xt_entry_target *target;
 175
 176         target = ipt_get_target(e->entry);
 177
 178         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 179                 struct xt_standard_target *t;
 180
 181                 t = (struct xt_standard_target *)target;
 182
 183                 switch (t->verdict) {
 184                 case XT_RETURN:
 185                 case -NF_ACCEPT - 1:
 186                 case -NF_DROP - 1:
 187                 case -NF_QUEUE - 1:
 188                 case -NF_STOP - 1:
 189                         return false;
 190
 191                 default:
 192                         return true;
 193                 }
 194         }
 195
 196         return false;
 197 }
 198
 199 static gboolean is_chain(struct connman_iptables *table,
 200                                 struct connman_iptables_entry *e)
 201 {
 202         struct ipt_entry *entry;
 203         struct xt_entry_target *target;
 204
 205         entry = e->entry;
 206         if (e->builtin >= 0)
 207                 return TRUE;
 208
 209         target = ipt_get_target(entry);
 210         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
 211                 return TRUE;
 212
 213         return FALSE;
 214 }
 215
 216 static GList *find_chain_head(struct connman_iptables *table,
 217                                 char *chain_name)
 218 {
 219         GList *list;
 220         struct connman_iptables_entry *head;
 221         struct ipt_entry *entry;
 222         struct xt_entry_target *target;
 223         int builtin;
 224
 225         for (list = table->entries; list; list = list->next) {
 226                 head = list->data;
 227                 entry = head->entry;
 228
 229                 /* Buit-in chain */
 230                 builtin = head->builtin;
 231                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 232                         break;
 233
 234                 /* User defined chain */
 235                 target = ipt_get_target(entry);
 236                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 237                     !strcmp((char *)target->data, chain_name))
 238                         break;
 239         }
 240
 241         return list;
 242 }
 243
 244 static GList *find_chain_tail(struct connman_iptables *table,
 245                                 char *chain_name)
 246 {
 247         struct connman_iptables_entry *tail;
 248         GList *chain_head, *list;
 249
 250         chain_head = find_chain_head(table, chain_name);
 251         if (chain_head == NULL)
 252                 return NULL;
 253
 254         /* Then we look for the next chain */
 255         for (list = chain_head->next; list; list = list->next) {
 256                 tail = list->data;
 257
 258                 if (is_chain(table, tail))
 259                         return list;
 260         }
 261
 262         /* Nothing found, we return the table end */
 263         return g_list_last(table->entries);
 264 }
 265
 266
 267 static void update_offsets(struct connman_iptables *table)
 268 {
 269         GList *list, *prev;
 270         struct connman_iptables_entry *entry, *prev_entry;
 271
 272         for (list = table->entries; list; list = list->next) {
 273                 entry = list->data;
 274
 275                 if (list == table->entries) {
 276                         entry->offset = 0;
 277
 278                         continue;
 279                 }
 280
 281                 prev = list->prev;
 282                 prev_entry = prev->data;
 283
 284                 entry->offset = prev_entry->offset +
 285                                         prev_entry->entry->next_offset;
 286         }
 287 }
 288
 289 static void update_targets_reference(struct connman_iptables *table,
 290                                 struct connman_iptables_entry *entry_before,
 291                                 struct connman_iptables_entry *modified_entry,
 292                                 gboolean is_removing)
 293 {
 294         struct connman_iptables_entry *tmp;
 295         struct xt_standard_target *t;
 296         GList *list;
 297         int offset;
 298
 299         offset = modified_entry->entry->next_offset;
 300
 301         for (list = table->entries; list; list = list->next) {
 302                 tmp = list->data;
 303
 304                 if (!is_jump(tmp))
 305                         continue;
 306
 307                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 308
 309                 if (is_removing == TRUE) {
 310                         if (t->verdict >= entry_before->offset)
 311                                 t->verdict -= offset;
 312                 } else {
 313                         if (t->verdict > entry_before->offset)
 314                                 t->verdict += offset;
 315                 }
 316         }
 317 }
 318
 319 static int iptables_add_entry(struct connman_iptables *table,
 320                                 struct ipt_entry *entry, GList *before,
 321                                         int builtin)
 322 {
 323         struct connman_iptables_entry *e, *entry_before;
 324
 325         if (table == NULL)
 326                 return -1;
 327
 328         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 329         if (e == NULL)
 330                 return -1;
 331
 332         e->entry = entry;
 333         e->builtin = builtin;
 334
 335         table->entries = g_list_insert_before(table->entries, before, e);
 336         table->num_entries++;
 337         table->size += entry->next_offset;
 338
 339         if (before == NULL) {
 340                 e->offset = table->size - entry->next_offset;
 341
 342                 return 0;
 343         }
 344
 345         entry_before = before->data;
 346
 347         /*
 348          * We've just appended/insterted a new entry. All references
 349          * should be bumped accordingly.
 350          */
 351         update_targets_reference(table, entry_before, e, FALSE);
 352
 353         update_offsets(table);
 354
 355         return 0;
 356 }
 357
 358 static int remove_table_entry(struct connman_iptables *table,
 359                                 struct connman_iptables_entry *entry)
 360 {
 361         int removed = 0;
 362
 363         table->num_entries--;
 364         table->size -= entry->entry->next_offset;
 365         removed = entry->entry->next_offset;
 366
 367         g_free(entry->entry);
 368
 369         table->entries = g_list_remove(table->entries, entry);
 370
 371         return removed;
 372 }
 373
 374 static int iptables_flush_chain(struct connman_iptables *table,
 375                                                 char *name)
 376 {
 377         GList *chain_head, *chain_tail, *list, *next;
 378         struct connman_iptables_entry *entry;
 379         int builtin, removed = 0;
 380
 381         chain_head = find_chain_head(table, name);
 382         if (chain_head == NULL)
 383                 return -EINVAL;
 384
 385         chain_tail = find_chain_tail(table, name);
 386         if (chain_tail == NULL)
 387                 return -EINVAL;
 388
 389         entry = chain_head->data;
 390         builtin = entry->builtin;
 391
 392         if (builtin >= 0)
 393                 list = chain_head;
 394         else
 395                 list = chain_head->next;
 396
 397         if (list == chain_tail->prev)
 398                 return 0;
 399
 400         while (list != chain_tail->prev) {
 401                 entry = list->data;
 402                 next = g_list_next(list);
 403
 404                 removed += remove_table_entry(table, entry);
 405
 406                 list = next;
 407         }
 408
 409         if (builtin >= 0) {
 410                 struct connman_iptables_entry *e;
 411
 412                 entry = list->data;
 413
 414                 entry->builtin = builtin;
 415
 416                 table->underflow[builtin] -= removed;
 417
 418                 for (list = chain_tail; list; list = list->next) {
 419                         e = list->data;
 420
 421                         builtin = e->builtin;
 422                         if (builtin < 0)
 423                                 continue;
 424
 425                         table->hook_entry[builtin] -= removed;
 426                         table->underflow[builtin] -= removed;
 427                 }
 428         }
 429
 430         update_offsets(table);
 431
 432         return 0;
 433 }
 434
 435 static int iptables_add_chain(struct connman_iptables *table,
 436                                         char *name)
 437 {
 438         GList *last;
 439         struct ipt_entry *entry_head;
 440         struct ipt_entry *entry_return;
 441         struct error_target *error;
 442         struct ipt_standard_target *standard;
 443         u_int16_t entry_head_size, entry_return_size;
 444
 445         last = g_list_last(table->entries);
 446
 447         /*
 448          * An empty chain is composed of:
 449          * - A head entry, with no match and an error target.
 450          *   The error target data is the chain name.
 451          * - A tail entry, with no match and a standard target.
 452          *   The standard target verdict is XT_RETURN (return to the
 453          *   caller).
 454          */
 455
 456         /* head entry */
 457         entry_head_size = sizeof(struct ipt_entry) +
 458                                 sizeof(struct error_target);
 459         entry_head = g_try_malloc0(entry_head_size);
 460         if (entry_head == NULL)
 461                 goto err_head;
 462
 463         memset(entry_head, 0, entry_head_size);
 464
 465         entry_head->target_offset = sizeof(struct ipt_entry);
 466         entry_head->next_offset = entry_head_size;
 467
 468         error = (struct error_target *) entry_head->elems;
 469         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 470         error->t.u.user.target_size = ALIGN(sizeof(struct error_target));
 471         strcpy(error->error, name);
 472
 473         if (iptables_add_entry(table, entry_head, last, -1) < 0)
 474                 goto err_head;
 475
 476         /* tail entry */
 477         entry_return_size = sizeof(struct ipt_entry) +
 478                                 sizeof(struct ipt_standard_target);
 479         entry_return = g_try_malloc0(entry_return_size);
 480         if (entry_return == NULL)
 481                 goto err;
 482
 483         memset(entry_return, 0, entry_return_size);
 484
 485         entry_return->target_offset = sizeof(struct ipt_entry);
 486         entry_return->next_offset = entry_return_size;
 487
 488         standard = (struct ipt_standard_target *) entry_return->elems;
 489         standard->target.u.user.target_size =
 490                                 ALIGN(sizeof(struct ipt_standard_target));
 491         standard->verdict = XT_RETURN;
 492
 493         if (iptables_add_entry(table, entry_return, last, -1) < 0)
 494                 goto err;
 495
 496         return 0;
 497
 498 err:
 499         g_free(entry_return);
 500 err_head:
 501         g_free(entry_head);
 502
 503         return -ENOMEM;
 504 }
 505
 506 static int iptables_delete_chain(struct connman_iptables *table, char *name)
 507 {
 508         struct connman_iptables_entry *entry;
 509         GList *chain_head, *chain_tail;
 510
 511         chain_head = find_chain_head(table, name);
 512         if (chain_head == NULL)
 513                 return -EINVAL;
 514
 515         entry = chain_head->data;
 516
 517         /* We cannot remove builtin chain */
 518         if (entry->builtin >= 0)
 519                 return -EINVAL;
 520
 521         chain_tail = find_chain_tail(table, name);
 522         if (chain_tail == NULL)
 523                 return -EINVAL;
 524
 525         /* Chain must be flushed */
 526         if (chain_head->next != chain_tail->prev)
 527                 return -EINVAL;
 528
 529         remove_table_entry(table, entry);
 530
 531         entry = chain_tail->prev->data;
 532         remove_table_entry(table, entry);
 533
 534         update_offsets(table);
 535
 536         return 0;
 537 }
 538
 539 static struct ipt_entry *new_rule(struct ipt_ip *ip,
 540                 char *target_name, struct xtables_target *xt_t,
 541                 struct xtables_rule_match *xt_rm)
 542 {
 543         struct xtables_rule_match *tmp_xt_rm;
 544         struct ipt_entry *new_entry;
 545         size_t match_size, target_size;
 546
 547         match_size = 0;
 548         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL; tmp_xt_rm = tmp_xt_rm->next)
 549                 match_size += tmp_xt_rm->match->m->u.match_size;
 550
 551         if (xt_t)
 552                 target_size = ALIGN(xt_t->t->u.target_size);
 553         else
 554                 target_size = ALIGN(sizeof(struct xt_standard_target));
 555
 556         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 557                                                                 match_size);
 558         if (new_entry == NULL)
 559                 return NULL;
 560
 561         memcpy(&new_entry->ip, ip, sizeof(struct ipt_ip));
 562
 563         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 564         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 565                                                                 match_size;
 566
 567         match_size = 0;
 568         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
 569                                 tmp_xt_rm = tmp_xt_rm->next) {
 570                 memcpy(new_entry->elems + match_size, tmp_xt_rm->match->m,
 571                                         tmp_xt_rm->match->m->u.match_size);
 572                 match_size += tmp_xt_rm->match->m->u.match_size;
 573         }
 574
 575         if (xt_t) {
 576                 struct xt_entry_target *entry_target;
 577
 578                 entry_target = ipt_get_target(new_entry);
 579                 memcpy(entry_target, xt_t->t, target_size);
 580         }
 581
 582         return new_entry;
 583 }
 584
 585 static void update_hooks(struct connman_iptables *table, GList *chain_head,
 586                                 struct ipt_entry *entry)
 587 {
 588         GList *list;
 589         struct connman_iptables_entry *head, *e;
 590         int builtin;
 591
 592         if (chain_head == NULL)
 593                 return;
 594
 595         head = chain_head->data;
 596
 597         builtin = head->builtin;
 598         if (builtin < 0)
 599                 return;
 600
 601         table->underflow[builtin] += entry->next_offset;
 602
 603         for (list = chain_head->next; list; list = list->next) {
 604                 e = list->data;
 605
 606                 builtin = e->builtin;
 607                 if (builtin < 0)
 608                         continue;
 609
 610                 table->hook_entry[builtin] += entry->next_offset;
 611                 table->underflow[builtin] += entry->next_offset;
 612         }
 613 }
 614
 615 static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
 616                                 struct ipt_ip *ip, char *chain_name,
 617                                 char *target_name, struct xtables_target *xt_t,
 618                                 int *builtin, struct xtables_rule_match *xt_rm)
 619 {
 620         GList *chain_tail, *chain_head;
 621         struct ipt_entry *new_entry;
 622         struct connman_iptables_entry *head;
 623
 624         chain_head = find_chain_head(table, chain_name);
 625         if (chain_head == NULL)
 626                 return NULL;
 627
 628         chain_tail = find_chain_tail(table, chain_name);
 629         if (chain_tail == NULL)
 630                 return NULL;
 631
 632         new_entry = new_rule(ip, target_name, xt_t, xt_rm);
 633         if (new_entry == NULL)
 634                 return NULL;
 635
 636         update_hooks(table, chain_head, new_entry);
 637
 638         /*
 639          * If the chain is builtin, and does not have any rule,
 640          * then the one that we're inserting is becoming the head
 641          * and thus needs the builtin flag.
 642          */
 643         head = chain_head->data;
 644         if (head->builtin < 0)
 645                 *builtin = -1;
 646         else if (chain_head == chain_tail->prev) {
 647                 *builtin = head->builtin;
 648                 head->builtin = -1;
 649         }
 650
 651         return new_entry;
 652 }
 653
 654 static int iptables_append_rule(struct connman_iptables *table,
 655                                 struct ipt_ip *ip, char *chain_name,
 656                                 char *target_name, struct xtables_target *xt_t,
 657                                 struct xtables_rule_match *xt_rm)
 658 {
 659         GList *chain_tail;
 660         struct ipt_entry *new_entry;
 661         int builtin = -1, ret;
 662
 663         DBG("");
 664
 665         chain_tail = find_chain_tail(table, chain_name);
 666         if (chain_tail == NULL)
 667                 return -EINVAL;
 668
 669         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 670                                         target_name, xt_t, &builtin, xt_rm);
 671         if (new_entry == NULL)
 672                 return -EINVAL;
 673
 674         ret = iptables_add_entry(table, new_entry, chain_tail->prev, builtin);
 675         if (ret < 0)
 676                 g_free(new_entry);
 677
 678         return ret;
 679 }
 680
 681 static int iptables_insert_rule(struct connman_iptables *table,
 682                                 struct ipt_ip *ip, char *chain_name,
 683                                 char *target_name, struct xtables_target *xt_t,
 684                                 struct xtables_rule_match *xt_rm)
 685 {
 686         struct ipt_entry *new_entry;
 687         int builtin = -1, ret;
 688         GList *chain_head;
 689
 690         chain_head = find_chain_head(table, chain_name);
 691         if (chain_head == NULL)
 692                 return -EINVAL;
 693
 694         new_entry = prepare_rule_inclusion(table, ip, chain_name,
 695                                         target_name, xt_t, &builtin, xt_rm);
 696         if (new_entry == NULL)
 697                 return -EINVAL;
 698
 699         ret = iptables_add_entry(table, new_entry, chain_head->next, builtin);
 700         if (ret < 0)
 701                 g_free(new_entry);
 702
 703         return ret;
 704 }
 705
 706 static gboolean is_same_ipt_entry(struct ipt_entry *i_e1,
 707                                         struct ipt_entry *i_e2)
 708 {
 709         if (memcmp(&i_e1->ip, &i_e2->ip, sizeof(struct ipt_ip)) != 0)
 710                 return FALSE;
 711
 712         if (i_e1->target_offset != i_e2->target_offset)
 713                 return FALSE;
 714
 715         if (i_e1->next_offset != i_e2->next_offset)
 716                 return FALSE;
 717
 718         return TRUE;
 719 }
 720
 721 static gboolean is_same_target(struct xt_entry_target *xt_e_t1,
 722                                         struct xt_entry_target *xt_e_t2)
 723 {
 724         if (xt_e_t1 == NULL || xt_e_t2 == NULL)
 725                 return FALSE;
 726
 727         if (strcmp(xt_e_t1->u.user.name, IPT_STANDARD_TARGET) == 0) {
 728                 struct xt_standard_target *xt_s_t1;
 729                 struct xt_standard_target *xt_s_t2;
 730
 731                 xt_s_t1 = (struct xt_standard_target *) xt_e_t1;
 732                 xt_s_t2 = (struct xt_standard_target *) xt_e_t2;
 733
 734                 if (xt_s_t1->verdict != xt_s_t2->verdict)
 735                         return FALSE;
 736         } else {
 737                 if (xt_e_t1->u.target_size != xt_e_t2->u.target_size)
 738                         return FALSE;
 739
 740                 if (strcmp(xt_e_t1->u.user.name, xt_e_t2->u.user.name) != 0)
 741                         return FALSE;
 742         }
 743
 744         return TRUE;
 745 }
 746
 747 static gboolean is_same_match(struct xt_entry_match *xt_e_m1,
 748                                 struct xt_entry_match *xt_e_m2)
 749 {
 750         if (xt_e_m1 == NULL || xt_e_m2 == NULL)
 751                 return FALSE;
 752
 753         if (xt_e_m1->u.match_size != xt_e_m2->u.match_size)
 754                 return FALSE;
 755
 756         if (xt_e_m1->u.user.revision != xt_e_m2->u.user.revision)
 757                 return FALSE;
 758
 759         if (strcmp(xt_e_m1->u.user.name, xt_e_m2->u.user.name) != 0)
 760                 return FALSE;
 761
 762         return TRUE;
 763 }
 764
 765 static GList *find_existing_rule(struct connman_iptables *table,
 766                                 struct ipt_ip *ip, char *chain_name,
 767                                 char *target_name, struct xtables_target *xt_t,
 768                                 struct xtables_match *xt_m,
 769                                 struct xtables_rule_match *xt_rm)
 770 {
 771         GList *chain_tail, *chain_head, *list;
 772         struct xt_entry_target *xt_e_t = NULL;
 773         struct xt_entry_match *xt_e_m = NULL;
 774         struct connman_iptables_entry *entry;
 775         struct ipt_entry *entry_test;
 776         int builtin;
 777
 778         chain_head = find_chain_head(table, chain_name);
 779         if (chain_head == NULL)
 780                 return NULL;
 781
 782         chain_tail = find_chain_tail(table, chain_name);
 783         if (chain_tail == NULL)
 784                 return NULL;
 785
 786         if (!xt_t && !xt_m)
 787                 return NULL;
 788
 789         entry_test = new_rule(ip, target_name, xt_t, xt_rm);
 790         if (entry_test == NULL)
 791                 return NULL;
 792
 793         if (xt_t != NULL)
 794                 xt_e_t = ipt_get_target(entry_test);
 795         if (xt_m != NULL)
 796                 xt_e_m = (struct xt_entry_match *)entry_test->elems;
 797
 798         entry = chain_head->data;
 799         builtin = entry->builtin;
 800
 801         if (builtin >= 0)
 802                 list = chain_head;
 803         else
 804                 list = chain_head->next;
 805
 806         for (; list != chain_tail->prev; list = list->next) {
 807                 struct connman_iptables_entry *tmp;
 808                 struct ipt_entry *tmp_e;
 809
 810                 tmp = list->data;
 811                 tmp_e = tmp->entry;
 812
 813                 if (is_same_ipt_entry(entry_test, tmp_e) == FALSE)
 814                         continue;
 815
 816                 if (xt_t != NULL) {
 817                         struct xt_entry_target *tmp_xt_e_t;
 818
 819                         tmp_xt_e_t = ipt_get_target(tmp_e);
 820
 821                         if (!is_same_target(tmp_xt_e_t, xt_e_t))
 822                                 continue;
 823                 }
 824
 825                 if (xt_m != NULL) {
 826                         struct xt_entry_match *tmp_xt_e_m;
 827
 828                         tmp_xt_e_m = (struct xt_entry_match *)tmp_e->elems;
 829
 830                         if (!is_same_match(tmp_xt_e_m, xt_e_m))
 831                                 continue;
 832                 }
 833
 834                 break;
 835         }
 836
 837         g_free(entry_test);
 838
 839         if (list != chain_tail->prev)
 840                 return list;
 841
 842         return NULL;
 843 }
 844
 845 static int iptables_delete_rule(struct connman_iptables *table,
 846                                 struct ipt_ip *ip, char *chain_name,
 847                                 char *target_name, struct xtables_target *xt_t,
 848                                 struct xtables_match *xt_m,
 849                                 struct xtables_rule_match *xt_rm)
 850 {
 851         struct connman_iptables_entry *entry;
 852         GList *chain_tail, *list;
 853         int builtin, removed;
 854
 855         removed = 0;
 856
 857         chain_tail = find_chain_tail(table, chain_name);
 858         if (chain_tail == NULL)
 859                 return -EINVAL;
 860
 861         list = find_existing_rule(table, ip, chain_name, target_name,
 862                                                         xt_t, xt_m, xt_rm);
 863         if (list == NULL)
 864                 return -EINVAL;
 865
 866         entry = list->data;
 867         if (entry == NULL)
 868                 return -EINVAL;
 869
 870         builtin = entry->builtin;
 871
 872         /* We have deleted a rule,
 873          * all references should be bumped accordingly */
 874         if (list->next != NULL)
 875                 update_targets_reference(table, list->next->data,
 876                                                 list->data, TRUE);
 877
 878         removed += remove_table_entry(table, entry);
 879
 880         if (builtin >= 0) {
 881                 list = list->next;
 882                 if (list) {
 883                         entry = list->data;
 884                         entry->builtin = builtin;
 885                 }
 886
 887                 table->underflow[builtin] -= removed;
 888                 for (list = chain_tail; list; list = list->next) {
 889                         entry = list->data;
 890
 891                         builtin = entry->builtin;
 892                         if (builtin < 0)
 893                                 continue;
 894
 895                         table->hook_entry[builtin] -= removed;
 896                         table->underflow[builtin] -= removed;
 897                 }
 898         }
 899
 900         update_offsets(table);
 901
 902         return 0;
 903 }
 904
 905 static int iptables_change_policy(struct connman_iptables *table,
 906                                         char *chain_name, char *policy)
 907 {
 908         GList *chain_head;
 909         struct connman_iptables_entry *entry;
 910         struct xt_entry_target *target;
 911         struct xt_standard_target *t;
 912         int verdict;
 913
 914         verdict = target_to_verdict(policy);
 915         if (verdict == 0)
 916                 return -EINVAL;
 917
 918         chain_head = find_chain_head(table, chain_name);
 919         if (chain_head == NULL)
 920                 return -EINVAL;
 921
 922         entry = chain_head->data;
 923         if (entry->builtin < 0)
 924                 return -EINVAL;
 925
 926         target = ipt_get_target(entry->entry);
 927
 928         t = (struct xt_standard_target *)target;
 929         t->verdict = verdict;
 930
 931         return 0;
 932 }
 933
 934 static struct ipt_replace *iptables_blob(struct connman_iptables *table)
 935 {
 936         struct ipt_replace *r;
 937         GList *list;
 938         struct connman_iptables_entry *e;
 939         unsigned char *entry_index;
 940
 941         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 942         if (r == NULL)
 943                 return NULL;
 944
 945         memset(r, 0, sizeof(*r) + table->size);
 946
 947         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 948                                 * table->old_entries);
 949         if (r->counters == NULL) {
 950                 g_free(r);
 951                 return NULL;
 952         }
 953
 954         strcpy(r->name, table->info->name);
 955         r->num_entries = table->num_entries;
 956         r->size = table->size;
 957
 958         r->num_counters = table->old_entries;
 959         r->valid_hooks  = table->info->valid_hooks;
 960
 961         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 962         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 963
 964         entry_index = (unsigned char *)r->entries;
 965         for (list = table->entries; list; list = list->next) {
 966                 e = list->data;
 967
 968                 memcpy(entry_index, e->entry, e->entry->next_offset);
 969                 entry_index += e->entry->next_offset;
 970         }
 971
 972         return r;
 973 }
 974
 975 static void dump_ip(struct ipt_entry *entry)
 976 {
 977         struct ipt_ip *ip = &entry->ip;
 978         char ip_string[INET6_ADDRSTRLEN];
 979         char ip_mask[INET6_ADDRSTRLEN];
 980
 981         if (strlen(ip->iniface))
 982                 connman_info("\tin %s", ip->iniface);
 983
 984         if (strlen(ip->outiface))
 985                 connman_info("\tout %s", ip->outiface);
 986
 987         if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
 988                         inet_ntop(AF_INET, &ip->smsk,
 989                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 990                 connman_info("\tsrc %s/%s", ip_string, ip_mask);
 991
 992         if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
 993                         inet_ntop(AF_INET, &ip->dmsk,
 994                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
 995                 connman_info("\tdst %s/%s", ip_string, ip_mask);
 996 }
 997
 998 static void dump_target(struct connman_iptables *table,
 999                                 struct ipt_entry *entry)
1000
1001 {
1002         struct xtables_target *xt_t;
1003         struct xt_entry_target *target;
1004
1005         target = ipt_get_target(entry);
1006
1007         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
1008                 struct xt_standard_target *t;
1009
1010                 t = (struct xt_standard_target *)target;
1011
1012                 switch (t->verdict) {
1013                 case XT_RETURN:
1014                         connman_info("\ttarget RETURN");
1015                         break;
1016
1017                 case -NF_ACCEPT - 1:
1018                         connman_info("\ttarget ACCEPT");
1019                         break;
1020
1021                 case -NF_DROP - 1:
1022                         connman_info("\ttarget DROP");
1023                         break;
1024
1025                 case -NF_QUEUE - 1:
1026                         connman_info("\ttarget QUEUE");
1027                         break;
1028
1029                 case -NF_STOP - 1:
1030                         connman_info("\ttarget STOP");
1031                         break;
1032
1033                 default:
1034                         connman_info("\tJUMP @%p (0x%x)",
1035                                 (char*)table->blob_entries->entrytable +
1036                                 t->verdict, t->verdict);
1037                         break;
1038                 }
1039
1040                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1041                                                 XTF_LOAD_MUST_SUCCEED);
1042
1043                 if(xt_t->print != NULL)
1044                         xt_t->print(NULL, target, 1);
1045         } else {
1046                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
1047                 if (xt_t == NULL) {
1048                         connman_info("\ttarget %s", target->u.user.name);
1049                         return;
1050                 }
1051
1052                 if(xt_t->print != NULL) {
1053                         connman_info("\ttarget ");
1054                         xt_t->print(NULL, target, 1);
1055                 }
1056         }
1057 }
1058
1059 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
1060 {
1061         struct xtables_match *xt_m;
1062         struct xt_entry_match *match;
1063
1064         if (entry->elems == (unsigned char *)entry + entry->target_offset)
1065                 return;
1066
1067         match = (struct xt_entry_match *) entry->elems;
1068
1069         if (!strlen(match->u.user.name))
1070                 return;
1071
1072         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
1073         if (xt_m == NULL)
1074                 goto out;
1075
1076         if(xt_m->print != NULL) {
1077                 connman_info("\tmatch ");
1078                 xt_m->print(NULL, match, 1);
1079
1080                 return;
1081         }
1082
1083 out:
1084         connman_info("\tmatch %s", match->u.user.name);
1085
1086 }
1087
1088 static int dump_entry(struct ipt_entry *entry,
1089                                 struct connman_iptables *table)
1090 {
1091         struct xt_entry_target *target;
1092         unsigned int offset;
1093         int builtin;
1094
1095         offset = (char *)entry - (char *)table->blob_entries->entrytable;
1096         target = ipt_get_target(entry);
1097         builtin = is_hook_entry(table, entry);
1098
1099         if (entry_to_offset(table, entry) + entry->next_offset ==
1100                                         table->blob_entries->size) {
1101                 connman_info("End of CHAIN 0x%x", offset);
1102                 return 0;
1103         }
1104
1105         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
1106                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
1107                         target->data, entry, entry->elems,
1108                         (char *)entry + entry->target_offset,
1109                                 entry->next_offset);
1110
1111                 return 0;
1112         } else if (builtin >= 0) {
1113                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
1114                         hooknames[builtin], entry, entry->elems,
1115                         (char *)entry + entry->target_offset,
1116                                 entry->next_offset);
1117         } else {
1118                 connman_info("RULE %p  match %p  target %p  size %d", entry,
1119                         entry->elems,
1120                         (char *)entry + entry->target_offset,
1121                                 entry->next_offset);
1122         }
1123
1124         dump_match(table, entry);
1125         dump_target(table, entry);
1126         dump_ip(entry);
1127
1128         return 0;
1129 }
1130
1131 static void iptables_dump(struct connman_iptables *table)
1132 {
1133         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
1134                         table->info->name,
1135                         table->info->valid_hooks, table->info->num_entries,
1136                                 table->info->size);
1137
1138         ENTRY_ITERATE(table->blob_entries->entrytable,
1139                         table->blob_entries->size,
1140                         dump_entry, table);
1141
1142 }
1143
1144 static int iptables_get_entries(struct connman_iptables *table)
1145 {
1146         socklen_t entry_size;
1147
1148         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
1149
1150         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
1151                                 table->blob_entries, &entry_size);
1152 }
1153
1154 static int iptables_replace(struct connman_iptables *table,
1155                                         struct ipt_replace *r)
1156 {
1157         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
1158                          sizeof(*r) + r->size);
1159 }
1160
1161 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
1162 {
1163         struct ipt_entry *new_entry;
1164         int builtin;
1165
1166         new_entry = g_try_malloc0(entry->next_offset);
1167         if (new_entry == NULL)
1168                 return -ENOMEM;
1169
1170         memcpy(new_entry, entry, entry->next_offset);
1171
1172         builtin = is_hook_entry(table, entry);
1173
1174         return iptables_add_entry(table, new_entry, NULL, builtin);
1175 }
1176
1177 static void table_cleanup(struct connman_iptables *table)
1178 {
1179         GList *list;
1180         struct connman_iptables_entry *entry;
1181
1182         if (table == NULL)
1183                 return;
1184
1185         close(table->ipt_sock);
1186
1187         for (list = table->entries; list; list = list->next) {
1188                 entry = list->data;
1189
1190                 g_free(entry->entry);
1191                 g_free(entry);
1192         }
1193
1194         g_list_free(table->entries);
1195         g_free(table->info);
1196         g_free(table->blob_entries);
1197         g_free(table);
1198 }
1199
1200 static struct connman_iptables *iptables_init(char *table_name)
1201 {
1202         struct connman_iptables *table = NULL;
1203         char *module = NULL;
1204         socklen_t s;
1205
1206         DBG("%s", table_name);
1207
1208         if (xtables_insmod("ip_tables", NULL, TRUE) != 0)
1209                 return NULL;
1210
1211         module = g_strconcat("iptable_", table_name, NULL);
1212         if (module == NULL)
1213                 return NULL;
1214
1215         if (xtables_insmod(module, NULL, TRUE) != 0) {
1216                 g_free(module);
1217                 return NULL;
1218         }
1219
1220         g_free(module);
1221
1222         table = g_hash_table_lookup(table_hash, table_name);
1223         if (table != NULL)
1224                 return table;
1225
1226         table = g_try_new0(struct connman_iptables, 1);
1227         if (table == NULL)
1228                 return NULL;
1229
1230         table->info = g_try_new0(struct ipt_getinfo, 1);
1231         if (table->info == NULL)
1232                 goto err;
1233
1234         table->ipt_sock = socket(AF_INET, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW);
1235         if (table->ipt_sock < 0)
1236                 goto err;
1237
1238         s = sizeof(*table->info);
1239         strcpy(table->info->name, table_name);
1240         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
1241                                                 table->info, &s) < 0)
1242                 goto err;
1243
1244         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
1245                                                 table->info->size);
1246         if (table->blob_entries == NULL)
1247                 goto err;
1248
1249         strcpy(table->blob_entries->name, table_name);
1250         table->blob_entries->size = table->info->size;
1251
1252         if (iptables_get_entries(table) < 0)
1253                 goto err;
1254
1255         table->num_entries = 0;
1256         table->old_entries = table->info->num_entries;
1257         table->size = 0;
1258
1259         memcpy(table->underflow, table->info->underflow,
1260                                 sizeof(table->info->underflow));
1261         memcpy(table->hook_entry, table->info->hook_entry,
1262                                 sizeof(table->info->hook_entry));
1263
1264         ENTRY_ITERATE(table->blob_entries->entrytable,
1265                         table->blob_entries->size,
1266                                 add_entry, table);
1267
1268         g_hash_table_insert(table_hash, g_strdup(table_name), table);
1269
1270         return table;
1271
1272 err:
1273         table_cleanup(table);
1274
1275         return NULL;
1276 }
1277
1278 static struct option iptables_opts[] = {
1279         {.name = "append",        .has_arg = 1, .val = 'A'},
1280         {.name = "delete",        .has_arg = 1, .val = 'D'},
1281         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
1282         {.name = "insert",        .has_arg = 1, .val = 'I'},
1283         {.name = "list",          .has_arg = 2, .val = 'L'},
1284         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
1285         {.name = "policy",        .has_arg = 1, .val = 'P'},
1286         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
1287         {.name = "destination",   .has_arg = 1, .val = 'd'},
1288         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
1289         {.name = "jump",          .has_arg = 1, .val = 'j'},
1290         {.name = "match",         .has_arg = 1, .val = 'm'},
1291         {.name = "out-interface", .has_arg = 1, .val = 'o'},
1292         {.name = "source",        .has_arg = 1, .val = 's'},
1293         {.name = "table",         .has_arg = 1, .val = 't'},
1294         {NULL},
1295 };
1296
1297 struct xtables_globals iptables_globals = {
1298         .option_offset = 0,
1299         .opts = iptables_opts,
1300         .orig_opts = iptables_opts,
1301 };
1302
1303 static struct xtables_target *prepare_target(struct connman_iptables *table,
1304                                                         char *target_name)
1305 {
1306         struct xtables_target *xt_t = NULL;
1307         gboolean is_builtin, is_user_defined;
1308         GList *chain_head = NULL;
1309         size_t target_size;
1310
1311         is_builtin = FALSE;
1312         is_user_defined = FALSE;
1313
1314         if (is_builtin_target(target_name))
1315                 is_builtin = TRUE;
1316         else {
1317                 chain_head = find_chain_head(table, target_name);
1318                 if (chain_head != NULL && chain_head->next != NULL)
1319                         is_user_defined = TRUE;
1320         }
1321
1322         if (is_builtin || is_user_defined)
1323                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1324                                                 XTF_LOAD_MUST_SUCCEED);
1325         else
1326                 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1327
1328         if (xt_t == NULL)
1329                 return NULL;
1330
1331         target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1332
1333         xt_t->t = g_try_malloc0(target_size);
1334         if (xt_t->t == NULL)
1335                 return NULL;
1336
1337         xt_t->t->u.target_size = target_size;
1338
1339         if (is_builtin || is_user_defined) {
1340                 struct xt_standard_target *target;
1341
1342                 target = (struct xt_standard_target *)(xt_t->t);
1343                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
1344
1345                 if (is_builtin == TRUE)
1346                         target->verdict = target_to_verdict(target_name);
1347                 else if (is_user_defined == TRUE) {
1348                         struct connman_iptables_entry *target_rule;
1349
1350                         if (chain_head == NULL) {
1351                                 g_free(xt_t->t);
1352                                 return NULL;
1353                         }
1354
1355                         target_rule = chain_head->next->data;
1356                         target->verdict = target_rule->offset;
1357                 }
1358         } else {
1359                 strcpy(xt_t->t->u.user.name, target_name);
1360                 xt_t->t->u.user.revision = xt_t->revision;
1361                 if (xt_t->init != NULL)
1362                         xt_t->init(xt_t->t);
1363         }
1364
1365 #if XTABLES_VERSION_CODE > 5
1366         if (xt_t->x6_options != NULL)
1367                 iptables_globals.opts =
1368                         xtables_options_xfrm(
1369                                 iptables_globals.orig_opts,
1370                                 iptables_globals.opts,
1371                                 xt_t->x6_options,
1372                                 &xt_t->option_offset);
1373         else
1374 #endif
1375                 iptables_globals.opts =
1376                         xtables_merge_options(
1377 #if XTABLES_VERSION_CODE > 5
1378                                 iptables_globals.orig_opts,
1379 #endif
1380                                 iptables_globals.opts,
1381                                 xt_t->extra_opts,
1382                                 &xt_t->option_offset);
1383
1384         if (iptables_globals.opts == NULL) {
1385                 g_free(xt_t->t);
1386                 xt_t = NULL;
1387         }
1388
1389         return xt_t;
1390 }
1391
1392 static struct xtables_match *prepare_matches(struct connman_iptables *table,
1393                         struct xtables_rule_match **xt_rm, char *match_name)
1394 {
1395         struct xtables_match *xt_m;
1396         size_t match_size;
1397
1398         if (match_name == NULL)
1399                 return NULL;
1400
1401         xt_m = xtables_find_match(match_name, XTF_LOAD_MUST_SUCCEED, xt_rm);
1402         match_size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
1403
1404         xt_m->m = g_try_malloc0(match_size);
1405         if (xt_m->m == NULL)
1406                 return NULL;
1407
1408         xt_m->m->u.match_size = match_size;
1409         strcpy(xt_m->m->u.user.name, xt_m->name);
1410         xt_m->m->u.user.revision = xt_m->revision;
1411
1412         if (xt_m->init != NULL)
1413                 xt_m->init(xt_m->m);
1414
1415         if (xt_m == xt_m->next)
1416                 goto done;
1417
1418 #if XTABLES_VERSION_CODE > 5
1419         if (xt_m->x6_options != NULL)
1420                 iptables_globals.opts =
1421                         xtables_options_xfrm(
1422                                 iptables_globals.orig_opts,
1423                                 iptables_globals.opts,
1424                                 xt_m->x6_options,
1425                                 &xt_m->option_offset);
1426         else
1427 #endif
1428                         iptables_globals.opts =
1429                         xtables_merge_options(
1430 #if XTABLES_VERSION_CODE > 5
1431                                 iptables_globals.orig_opts,
1432 #endif
1433                                 iptables_globals.opts,
1434                                 xt_m->extra_opts,
1435                                 &xt_m->option_offset);
1436
1437         if (iptables_globals.opts == NULL) {
1438                 g_free(xt_m->m);
1439                 xt_m = NULL;
1440         }
1441
1442 done:
1443         return xt_m;
1444 }
1445
1446 static int iptables_command(int argc, char *argv[])
1447 {
1448         struct connman_iptables *table;
1449         struct xtables_rule_match *xt_rm, *tmp_xt_rm;
1450         struct xtables_match *xt_m, *xt_m_t;
1451         struct xtables_target *xt_t;
1452         struct ipt_ip ip;
1453         char *table_name, *chain, *new_chain, *match_name, *target_name;
1454         char *flush_chain, *delete_chain, *policy;
1455         int c, ret, in_len, out_len;
1456         gboolean dump, invert, insert, delete;
1457         struct in_addr src, dst;
1458
1459         if (argc == 0)
1460                 return -EINVAL;
1461
1462         dump = FALSE;
1463         invert = FALSE;
1464         insert = FALSE;
1465         delete = FALSE;
1466         table_name = chain = new_chain = match_name = target_name = NULL;
1467         flush_chain = delete_chain = policy = NULL;
1468         memset(&ip, 0, sizeof(struct ipt_ip));
1469         table = NULL;
1470         xt_rm = NULL;
1471         xt_m = NULL;
1472         xt_t = NULL;
1473         ret = 0;
1474
1475         /* extension's options will generate false-positives errors */
1476         opterr = 0;
1477
1478         optind = 0;
1479
1480         while ((c = getopt_long(argc, argv, "-A:F:I:L::N:P:X:d:j:i:m:o:s:t:",
1481                                         iptables_globals.opts, NULL)) != -1) {
1482                 switch (c) {
1483                 case 'A':
1484                         /* It is either -A, -D or -I at once */
1485                         if (chain)
1486                                 goto out;
1487
1488                         chain = optarg;
1489                         break;
1490
1491                 case 'D':
1492                         /* It is either -A, -D or -I at once */
1493                         if (chain)
1494                                 goto out;
1495
1496                         chain = optarg;
1497                         delete = TRUE;
1498                         break;
1499
1500                 case 'F':
1501                         flush_chain = optarg;
1502                         break;
1503
1504                 case 'I':
1505                         /* It is either -A, -D or -I at once */
1506                         if (chain)
1507                                 goto out;
1508
1509                         chain = optarg;
1510                         insert = TRUE;
1511                         break;
1512
1513                 case 'L':
1514                         dump = TRUE;
1515                         break;
1516
1517                 case 'N':
1518                         new_chain = optarg;
1519                         break;
1520
1521                 case 'P':
1522                         chain = optarg;
1523                         if (optind < argc)
1524                                 policy = argv[optind++];
1525                         else
1526                                 goto out;
1527
1528                         break;
1529
1530                 case 'X':
1531                         delete_chain = optarg;
1532                         break;
1533
1534                 case 'd':
1535                         if (!inet_pton(AF_INET, optarg, &dst))
1536                                 break;
1537
1538                         ip.dst = dst;
1539                         inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
1540
1541                         if (invert)
1542                                 ip.invflags |= IPT_INV_DSTIP;
1543
1544                         break;
1545
1546                 case 'i':
1547                         in_len = strlen(optarg);
1548
1549                         if (in_len + 1 > IFNAMSIZ)
1550                                 break;
1551
1552                         strcpy(ip.iniface, optarg);
1553                         memset(ip.iniface_mask, 0xff, in_len + 1);
1554
1555                         if (invert)
1556                                 ip.invflags |= IPT_INV_VIA_IN;
1557
1558                         break;
1559
1560                 case 'j':
1561                         target_name = optarg;
1562                         xt_t = prepare_target(table, target_name);
1563                         if (xt_t == NULL)
1564                                 goto out;
1565
1566                         break;
1567
1568                 case 'm':
1569                         match_name = optarg;
1570                         xt_m = prepare_matches(table, &xt_rm, match_name);
1571                         if (xt_m == NULL)
1572                                 goto out;
1573
1574                         break;
1575
1576                 case 'o':
1577                         out_len = strlen(optarg);
1578
1579                         if (out_len + 1 > IFNAMSIZ)
1580                                 break;
1581
1582                         strcpy(ip.outiface, optarg);
1583                         memset(ip.outiface_mask, 0xff, out_len + 1);
1584
1585                         if (invert)
1586                                 ip.invflags |= IPT_INV_VIA_OUT;
1587
1588                         break;
1589
1590                 case 's':
1591                         if (!inet_pton(AF_INET, optarg, &src))
1592                                 break;
1593
1594                         ip.src = src;
1595                         inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
1596
1597                         if (invert)
1598                                 ip.invflags |= IPT_INV_SRCIP;
1599
1600                         break;
1601
1602                 case 't':
1603                         table_name = optarg;
1604
1605                         table = iptables_init(table_name);
1606                         if (table == NULL) {
1607                                 ret = -EINVAL;
1608                                 goto out;
1609                         }
1610
1611                         break;
1612
1613                 case 1:
1614                         if (optarg[0] == '!' && optarg[1] == '\0') {
1615                                 invert = TRUE;
1616                                 optarg[0] = '\0';
1617                                 continue;
1618                         }
1619
1620                         connman_error("Invalid option");
1621
1622                         ret = -EINVAL;
1623                         goto out;
1624
1625                 default:
1626 #if XTABLES_VERSION_CODE > 5
1627                         if (xt_t != NULL && (xt_t->x6_parse != NULL ||
1628                                                 xt_t->parse != NULL) &&
1629                                         (c >= (int) xt_t->option_offset &&
1630                                         c < (int) xt_t->option_offset +
1631                                         XT_OPTION_OFFSET_SCALE)) {
1632                                 xtables_option_tpcall(c, argv,
1633                                                         invert, xt_t, NULL);
1634
1635                                 break;
1636                         }
1637
1638                         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1639                                                 tmp_xt_rm = tmp_xt_rm->next) {
1640                                 xt_m_t = tmp_xt_rm->match;
1641
1642                                 if (tmp_xt_rm->completed ||
1643                                                 (xt_m_t->x6_parse == NULL &&
1644                                                  xt_m_t->parse == NULL))
1645                                         continue;
1646
1647                                 if (c < (int) xt_m_t->option_offset ||
1648                                         c >= (int) xt_m_t->option_offset
1649                                         + XT_OPTION_OFFSET_SCALE)
1650                                         continue;
1651
1652                                 xtables_option_mpcall(c, argv,
1653                                                         invert, xt_m_t, NULL);
1654
1655                                 break;
1656                         }
1657 #else
1658                         if (xt_t == NULL || xt_t->parse == NULL ||
1659                                 !xt_t->parse(c - xt_t->option_offset,
1660                                 argv, invert, &xt_t->tflags, NULL, &xt_t->t)) {
1661
1662                                 for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1663                                                 tmp_xt_rm = tmp_xt_rm->next) {
1664                                         xt_m_t = tmp_xt_rm->match;
1665
1666                                         if (tmp_xt_rm->completed ||
1667                                                         xt_m_t->parse == NULL)
1668                                                 continue;
1669
1670                                         if (xt_m->parse(c - xt_m->option_offset,
1671                                                 argv, invert, &xt_m->mflags,
1672                                                 NULL, &xt_m->m))
1673                                                 break;
1674                                 }
1675                         }
1676 #endif
1677                         break;
1678                 }
1679
1680                 invert = FALSE;
1681         }
1682
1683 #if XTABLES_VERSION_CODE > 5
1684         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1685                                 tmp_xt_rm = tmp_xt_rm->next)
1686                 xtables_option_mfcall(tmp_xt_rm->match);
1687
1688         if (xt_t != NULL)
1689                 xtables_option_tfcall(xt_t);
1690 #else
1691         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1692                                 tmp_xt_rm = tmp_xt_rm->next)
1693                 if (tmp_xt_rm->match->final_check != NULL)
1694                         tmp_xt_rm->match->final_check(
1695                                         tmp_xt_rm->match->mflags);
1696
1697         if (xt_t != NULL && xt_t->final_check != NULL)
1698                 xt_t->final_check(xt_t->tflags);
1699 #endif
1700
1701         if (table == NULL) {
1702                 table_name = "filter";
1703
1704                 table = iptables_init(table_name);
1705                 if (table == NULL) {
1706                         ret = -EINVAL;
1707                         goto out;
1708                 }
1709         }
1710
1711         if (delete_chain != NULL) {
1712                 printf("Delete chain %s\n", delete_chain);
1713
1714                 iptables_delete_chain(table, delete_chain);
1715
1716                 goto out;
1717         }
1718
1719         if (dump) {
1720                 iptables_dump(table);
1721
1722                 ret = 0;
1723                 goto out;
1724         }
1725
1726         if (flush_chain) {
1727                 DBG("Flush chain %s", flush_chain);
1728
1729                 iptables_flush_chain(table, flush_chain);
1730
1731                 goto out;
1732         }
1733
1734         if (chain && new_chain) {
1735                 ret = -EINVAL;
1736                 goto out;
1737         }
1738
1739         if (new_chain) {
1740                 DBG("New chain %s", new_chain);
1741
1742                 ret = iptables_add_chain(table, new_chain);
1743                 goto out;
1744         }
1745
1746         if (chain) {
1747                 if (policy != NULL) {
1748                         printf("Changing policy of %s to %s\n", chain, policy);
1749
1750                         iptables_change_policy(table, chain, policy);
1751
1752                         goto out;
1753                 }
1754
1755                 if (xt_t == NULL)
1756                         goto out;
1757
1758                 if (delete == TRUE) {
1759                         DBG("Deleting %s to %s (match %s)\n",
1760                                         target_name, chain, match_name);
1761
1762                         ret = iptables_delete_rule(table, &ip, chain,
1763                                         target_name, xt_t, xt_m, xt_rm);
1764
1765                         goto out;
1766                 }
1767
1768                 if (insert == TRUE) {
1769                         DBG("Inserting %s to %s (match %s)",
1770                                         target_name, chain, match_name);
1771
1772                         ret = iptables_insert_rule(table, &ip, chain,
1773                                                 target_name, xt_t, xt_rm);
1774
1775                         goto out;
1776                 } else {
1777                         DBG("Adding %s to %s (match %s)",
1778                                         target_name, chain, match_name);
1779
1780                         ret = iptables_append_rule(table, &ip, chain,
1781                                                 target_name, xt_t, xt_rm);
1782
1783                         goto out;
1784                 }
1785         }
1786
1787 out:
1788         if (xt_t)
1789                 g_free(xt_t->t);
1790
1791         if (xt_m)
1792                 g_free(xt_m->m);
1793
1794         return ret;
1795 }
1796
1797 int __connman_iptables_command(const char *format, ...)
1798 {
1799         char **argv, **arguments, *command;
1800         int argc, i, ret;
1801         va_list args;
1802
1803         if (format == NULL)
1804                 return -EINVAL;
1805
1806         va_start(args, format);
1807
1808         command = g_strdup_vprintf(format, args);
1809
1810         va_end(args);
1811
1812         if (command == NULL)
1813                 return -ENOMEM;
1814
1815         arguments = g_strsplit_set(command, " ", -1);
1816
1817         for (argc = 0; arguments[argc]; argc++);
1818         ++argc;
1819
1820         DBG("command %s argc %d", command, argc);
1821
1822         argv = g_try_malloc0(argc * sizeof(char *));
1823         if (argv == NULL) {
1824                 g_free(command);
1825                 g_strfreev(arguments);
1826                 return -ENOMEM;
1827         }
1828
1829         argv[0] = "iptables";
1830         for (i = 1; i < argc; i++)
1831                 argv[i] = arguments[i - 1];
1832
1833         ret = iptables_command(argc, argv);
1834
1835         g_free(command);
1836         g_strfreev(arguments);
1837         g_free(argv);
1838
1839         return ret;
1840 }
1841
1842
1843 int __connman_iptables_commit(const char *table_name)
1844 {
1845         struct connman_iptables *table;
1846         struct ipt_replace *repl;
1847         int err;
1848
1849         DBG("%s", table_name);
1850
1851         table = g_hash_table_lookup(table_hash, table_name);
1852         if (table == NULL)
1853                 return -EINVAL;
1854
1855         repl = iptables_blob(table);
1856
1857         err = iptables_replace(table, repl);
1858
1859         g_free(repl->counters);
1860         g_free(repl);
1861
1862         if (err < 0)
1863             return err;
1864
1865         g_hash_table_remove(table_hash, table_name);
1866
1867         return 0;
1868 }
1869
1870 static void remove_table(gpointer user_data)
1871 {
1872         struct connman_iptables *table = user_data;
1873
1874         table_cleanup(table);
1875 }
1876
1877 int __connman_iptables_init(void)
1878 {
1879         DBG("");
1880
1881         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1882                                                 g_free, remove_table);
1883
1884         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1885
1886         return 0;
1887
1888 }
1889
1890 void __connman_iptables_cleanup(void)
1891 {
1892         DBG("");
1893
1894         g_hash_table_destroy(table_hash);
1895
1896         xtables_free_opts(1);
1897 }