src/iptables.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2012  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         if (builtin == -1)
 700                 chain_head = chain_head->next;
 701
 702         ret = iptables_add_entry(table, new_entry, chain_head, builtin);
 703         if (ret < 0)
 704                 g_free(new_entry);
 705
 706         return ret;
 707 }
 708
 709 static gboolean is_same_ipt_entry(struct ipt_entry *i_e1,
 710                                         struct ipt_entry *i_e2)
 711 {
 712         if (memcmp(&i_e1->ip, &i_e2->ip, sizeof(struct ipt_ip)) != 0)
 713                 return FALSE;
 714
 715         if (i_e1->target_offset != i_e2->target_offset)
 716                 return FALSE;
 717
 718         if (i_e1->next_offset != i_e2->next_offset)
 719                 return FALSE;
 720
 721         return TRUE;
 722 }
 723
 724 static gboolean is_same_target(struct xt_entry_target *xt_e_t1,
 725                                         struct xt_entry_target *xt_e_t2)
 726 {
 727         if (xt_e_t1 == NULL || xt_e_t2 == NULL)
 728                 return FALSE;
 729
 730         if (strcmp(xt_e_t1->u.user.name, IPT_STANDARD_TARGET) == 0) {
 731                 struct xt_standard_target *xt_s_t1;
 732                 struct xt_standard_target *xt_s_t2;
 733
 734                 xt_s_t1 = (struct xt_standard_target *) xt_e_t1;
 735                 xt_s_t2 = (struct xt_standard_target *) xt_e_t2;
 736
 737                 if (xt_s_t1->verdict != xt_s_t2->verdict)
 738                         return FALSE;
 739         } else {
 740                 if (xt_e_t1->u.target_size != xt_e_t2->u.target_size)
 741                         return FALSE;
 742
 743                 if (strcmp(xt_e_t1->u.user.name, xt_e_t2->u.user.name) != 0)
 744                         return FALSE;
 745         }
 746
 747         return TRUE;
 748 }
 749
 750 static gboolean is_same_match(struct xt_entry_match *xt_e_m1,
 751                                 struct xt_entry_match *xt_e_m2)
 752 {
 753         if (xt_e_m1 == NULL || xt_e_m2 == NULL)
 754                 return FALSE;
 755
 756         if (xt_e_m1->u.match_size != xt_e_m2->u.match_size)
 757                 return FALSE;
 758
 759         if (xt_e_m1->u.user.revision != xt_e_m2->u.user.revision)
 760                 return FALSE;
 761
 762         if (strcmp(xt_e_m1->u.user.name, xt_e_m2->u.user.name) != 0)
 763                 return FALSE;
 764
 765         return TRUE;
 766 }
 767
 768 static GList *find_existing_rule(struct connman_iptables *table,
 769                                 struct ipt_ip *ip, char *chain_name,
 770                                 char *target_name, struct xtables_target *xt_t,
 771                                 struct xtables_match *xt_m,
 772                                 struct xtables_rule_match *xt_rm)
 773 {
 774         GList *chain_tail, *chain_head, *list;
 775         struct xt_entry_target *xt_e_t = NULL;
 776         struct xt_entry_match *xt_e_m = NULL;
 777         struct connman_iptables_entry *entry;
 778         struct ipt_entry *entry_test;
 779         int builtin;
 780
 781         chain_head = find_chain_head(table, chain_name);
 782         if (chain_head == NULL)
 783                 return NULL;
 784
 785         chain_tail = find_chain_tail(table, chain_name);
 786         if (chain_tail == NULL)
 787                 return NULL;
 788
 789         if (!xt_t && !xt_m)
 790                 return NULL;
 791
 792         entry_test = new_rule(ip, target_name, xt_t, xt_rm);
 793         if (entry_test == NULL)
 794                 return NULL;
 795
 796         if (xt_t != NULL)
 797                 xt_e_t = ipt_get_target(entry_test);
 798         if (xt_m != NULL)
 799                 xt_e_m = (struct xt_entry_match *)entry_test->elems;
 800
 801         entry = chain_head->data;
 802         builtin = entry->builtin;
 803
 804         if (builtin >= 0)
 805                 list = chain_head;
 806         else
 807                 list = chain_head->next;
 808
 809         for (; list != chain_tail->prev; list = list->next) {
 810                 struct connman_iptables_entry *tmp;
 811                 struct ipt_entry *tmp_e;
 812
 813                 tmp = list->data;
 814                 tmp_e = tmp->entry;
 815
 816                 if (is_same_ipt_entry(entry_test, tmp_e) == FALSE)
 817                         continue;
 818
 819                 if (xt_t != NULL) {
 820                         struct xt_entry_target *tmp_xt_e_t;
 821
 822                         tmp_xt_e_t = ipt_get_target(tmp_e);
 823
 824                         if (!is_same_target(tmp_xt_e_t, xt_e_t))
 825                                 continue;
 826                 }
 827
 828                 if (xt_m != NULL) {
 829                         struct xt_entry_match *tmp_xt_e_m;
 830
 831                         tmp_xt_e_m = (struct xt_entry_match *)tmp_e->elems;
 832
 833                         if (!is_same_match(tmp_xt_e_m, xt_e_m))
 834                                 continue;
 835                 }
 836
 837                 break;
 838         }
 839
 840         g_free(entry_test);
 841
 842         if (list != chain_tail->prev)
 843                 return list;
 844
 845         return NULL;
 846 }
 847
 848 static int iptables_delete_rule(struct connman_iptables *table,
 849                                 struct ipt_ip *ip, char *chain_name,
 850                                 char *target_name, struct xtables_target *xt_t,
 851                                 struct xtables_match *xt_m,
 852                                 struct xtables_rule_match *xt_rm)
 853 {
 854         struct connman_iptables_entry *entry;
 855         GList *chain_tail, *list;
 856         int builtin, removed;
 857
 858         removed = 0;
 859
 860         chain_tail = find_chain_tail(table, chain_name);
 861         if (chain_tail == NULL)
 862                 return -EINVAL;
 863
 864         list = find_existing_rule(table, ip, chain_name, target_name,
 865                                                         xt_t, xt_m, xt_rm);
 866         if (list == NULL)
 867                 return -EINVAL;
 868
 869         entry = list->data;
 870         if (entry == NULL)
 871                 return -EINVAL;
 872
 873         builtin = entry->builtin;
 874
 875         /* We have deleted a rule,
 876          * all references should be bumped accordingly */
 877         if (list->next != NULL)
 878                 update_targets_reference(table, list->next->data,
 879                                                 list->data, TRUE);
 880
 881         removed += remove_table_entry(table, entry);
 882
 883         if (builtin >= 0) {
 884                 list = list->next;
 885                 if (list) {
 886                         entry = list->data;
 887                         entry->builtin = builtin;
 888                 }
 889
 890                 table->underflow[builtin] -= removed;
 891                 for (list = chain_tail; list; list = list->next) {
 892                         entry = list->data;
 893
 894                         builtin = entry->builtin;
 895                         if (builtin < 0)
 896                                 continue;
 897
 898                         table->hook_entry[builtin] -= removed;
 899                         table->underflow[builtin] -= removed;
 900                 }
 901         }
 902
 903         update_offsets(table);
 904
 905         return 0;
 906 }
 907
 908 static int iptables_compare_rule(struct connman_iptables *table,
 909                                 struct ipt_ip *ip, char *chain_name,
 910                                 char *target_name, struct xtables_target *xt_t,
 911                                 struct xtables_match *xt_m,
 912                                 struct xtables_rule_match *xt_rm)
 913 {
 914         struct connman_iptables_entry *entry;
 915         GList *found;
 916
 917         found = find_existing_rule(table, ip, chain_name, target_name,
 918                                                         xt_t, xt_m, xt_rm);
 919         if (found == NULL)
 920                 return -EINVAL;
 921
 922         entry = found->data;
 923         if (entry == NULL)
 924                 return -EINVAL;
 925
 926         return 0;
 927 }
 928
 929
 930 static int iptables_change_policy(struct connman_iptables *table,
 931                                         char *chain_name, char *policy)
 932 {
 933         GList *chain_head;
 934         struct connman_iptables_entry *entry;
 935         struct xt_entry_target *target;
 936         struct xt_standard_target *t;
 937         int verdict;
 938
 939         verdict = target_to_verdict(policy);
 940         if (verdict == 0)
 941                 return -EINVAL;
 942
 943         chain_head = find_chain_head(table, chain_name);
 944         if (chain_head == NULL)
 945                 return -EINVAL;
 946
 947         entry = chain_head->data;
 948         if (entry->builtin < 0)
 949                 return -EINVAL;
 950
 951         target = ipt_get_target(entry->entry);
 952
 953         t = (struct xt_standard_target *)target;
 954         t->verdict = verdict;
 955
 956         return 0;
 957 }
 958
 959 static struct ipt_replace *iptables_blob(struct connman_iptables *table)
 960 {
 961         struct ipt_replace *r;
 962         GList *list;
 963         struct connman_iptables_entry *e;
 964         unsigned char *entry_index;
 965
 966         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 967         if (r == NULL)
 968                 return NULL;
 969
 970         memset(r, 0, sizeof(*r) + table->size);
 971
 972         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 973                                 * table->old_entries);
 974         if (r->counters == NULL) {
 975                 g_free(r);
 976                 return NULL;
 977         }
 978
 979         strcpy(r->name, table->info->name);
 980         r->num_entries = table->num_entries;
 981         r->size = table->size;
 982
 983         r->num_counters = table->old_entries;
 984         r->valid_hooks  = table->info->valid_hooks;
 985
 986         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 987         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 988
 989         entry_index = (unsigned char *)r->entries;
 990         for (list = table->entries; list; list = list->next) {
 991                 e = list->data;
 992
 993                 memcpy(entry_index, e->entry, e->entry->next_offset);
 994                 entry_index += e->entry->next_offset;
 995         }
 996
 997         return r;
 998 }
 999
1000 static void dump_ip(struct ipt_entry *entry)
1001 {
1002         struct ipt_ip *ip = &entry->ip;
1003         char ip_string[INET6_ADDRSTRLEN];
1004         char ip_mask[INET6_ADDRSTRLEN];
1005
1006         if (strlen(ip->iniface))
1007                 connman_info("\tin %s", ip->iniface);
1008
1009         if (strlen(ip->outiface))
1010                 connman_info("\tout %s", ip->outiface);
1011
1012         if (inet_ntop(AF_INET, &ip->src, ip_string, INET6_ADDRSTRLEN) != NULL &&
1013                         inet_ntop(AF_INET, &ip->smsk,
1014                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
1015                 connman_info("\tsrc %s/%s", ip_string, ip_mask);
1016
1017         if (inet_ntop(AF_INET, &ip->dst, ip_string, INET6_ADDRSTRLEN) != NULL &&
1018                         inet_ntop(AF_INET, &ip->dmsk,
1019                                         ip_mask, INET6_ADDRSTRLEN) != NULL)
1020                 connman_info("\tdst %s/%s", ip_string, ip_mask);
1021 }
1022
1023 static void dump_target(struct connman_iptables *table,
1024                                 struct ipt_entry *entry)
1025
1026 {
1027         struct xtables_target *xt_t;
1028         struct xt_entry_target *target;
1029
1030         target = ipt_get_target(entry);
1031
1032         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
1033                 struct xt_standard_target *t;
1034
1035                 t = (struct xt_standard_target *)target;
1036
1037                 switch (t->verdict) {
1038                 case XT_RETURN:
1039                         connman_info("\ttarget RETURN");
1040                         break;
1041
1042                 case -NF_ACCEPT - 1:
1043                         connman_info("\ttarget ACCEPT");
1044                         break;
1045
1046                 case -NF_DROP - 1:
1047                         connman_info("\ttarget DROP");
1048                         break;
1049
1050                 case -NF_QUEUE - 1:
1051                         connman_info("\ttarget QUEUE");
1052                         break;
1053
1054                 case -NF_STOP - 1:
1055                         connman_info("\ttarget STOP");
1056                         break;
1057
1058                 default:
1059                         connman_info("\tJUMP @%p (0x%x)",
1060                                 (char*)table->blob_entries->entrytable +
1061                                 t->verdict, t->verdict);
1062                         break;
1063                 }
1064
1065                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1066                                                 XTF_LOAD_MUST_SUCCEED);
1067
1068                 if(xt_t->print != NULL)
1069                         xt_t->print(NULL, target, 1);
1070         } else {
1071                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
1072                 if (xt_t == NULL) {
1073                         connman_info("\ttarget %s", target->u.user.name);
1074                         return;
1075                 }
1076
1077                 if(xt_t->print != NULL) {
1078                         connman_info("\ttarget ");
1079                         xt_t->print(NULL, target, 1);
1080                 }
1081         }
1082 }
1083
1084 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
1085 {
1086         struct xtables_match *xt_m;
1087         struct xt_entry_match *match;
1088
1089         if (entry->elems == (unsigned char *)entry + entry->target_offset)
1090                 return;
1091
1092         match = (struct xt_entry_match *) entry->elems;
1093
1094         if (!strlen(match->u.user.name))
1095                 return;
1096
1097         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
1098         if (xt_m == NULL)
1099                 goto out;
1100
1101         if(xt_m->print != NULL) {
1102                 connman_info("\tmatch ");
1103                 xt_m->print(NULL, match, 1);
1104
1105                 return;
1106         }
1107
1108 out:
1109         connman_info("\tmatch %s", match->u.user.name);
1110
1111 }
1112
1113 static int dump_entry(struct ipt_entry *entry,
1114                                 struct connman_iptables *table)
1115 {
1116         struct xt_entry_target *target;
1117         unsigned int offset;
1118         int builtin;
1119
1120         offset = (char *)entry - (char *)table->blob_entries->entrytable;
1121         target = ipt_get_target(entry);
1122         builtin = is_hook_entry(table, entry);
1123
1124         if (entry_to_offset(table, entry) + entry->next_offset ==
1125                                         table->blob_entries->size) {
1126                 connman_info("End of CHAIN 0x%x", offset);
1127                 return 0;
1128         }
1129
1130         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
1131                 connman_info("USER CHAIN (%s) %p  match %p  target %p  size %d",
1132                         target->data, entry, entry->elems,
1133                         (char *)entry + entry->target_offset,
1134                                 entry->next_offset);
1135
1136                 return 0;
1137         } else if (builtin >= 0) {
1138                 connman_info("CHAIN (%s) %p  match %p  target %p  size %d",
1139                         hooknames[builtin], entry, entry->elems,
1140                         (char *)entry + entry->target_offset,
1141                                 entry->next_offset);
1142         } else {
1143                 connman_info("RULE %p  match %p  target %p  size %d", entry,
1144                         entry->elems,
1145                         (char *)entry + entry->target_offset,
1146                                 entry->next_offset);
1147         }
1148
1149         dump_match(table, entry);
1150         dump_target(table, entry);
1151         dump_ip(entry);
1152
1153         return 0;
1154 }
1155
1156 static void iptables_dump(struct connman_iptables *table)
1157 {
1158         connman_info("%s valid_hooks=0x%08x, num_entries=%u, size=%u",
1159                         table->info->name,
1160                         table->info->valid_hooks, table->info->num_entries,
1161                                 table->info->size);
1162
1163         ENTRY_ITERATE(table->blob_entries->entrytable,
1164                         table->blob_entries->size,
1165                         dump_entry, table);
1166
1167 }
1168
1169 static int iptables_get_entries(struct connman_iptables *table)
1170 {
1171         socklen_t entry_size;
1172
1173         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
1174
1175         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
1176                                 table->blob_entries, &entry_size);
1177 }
1178
1179 static int iptables_replace(struct connman_iptables *table,
1180                                         struct ipt_replace *r)
1181 {
1182         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
1183                          sizeof(*r) + r->size);
1184 }
1185
1186 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
1187 {
1188         struct ipt_entry *new_entry;
1189         int builtin;
1190
1191         new_entry = g_try_malloc0(entry->next_offset);
1192         if (new_entry == NULL)
1193                 return -ENOMEM;
1194
1195         memcpy(new_entry, entry, entry->next_offset);
1196
1197         builtin = is_hook_entry(table, entry);
1198
1199         return iptables_add_entry(table, new_entry, NULL, builtin);
1200 }
1201
1202 static void table_cleanup(struct connman_iptables *table)
1203 {
1204         GList *list;
1205         struct connman_iptables_entry *entry;
1206
1207         if (table == NULL)
1208                 return;
1209
1210         close(table->ipt_sock);
1211
1212         for (list = table->entries; list; list = list->next) {
1213                 entry = list->data;
1214
1215                 g_free(entry->entry);
1216                 g_free(entry);
1217         }
1218
1219         g_list_free(table->entries);
1220         g_free(table->info);
1221         g_free(table->blob_entries);
1222         g_free(table);
1223 }
1224
1225 static struct connman_iptables *iptables_init(char *table_name)
1226 {
1227         struct connman_iptables *table = NULL;
1228         char *module = NULL;
1229         socklen_t s;
1230
1231         if (table_name == NULL)
1232                 table_name = "filter";
1233
1234         DBG("%s", table_name);
1235
1236         if (xtables_insmod("ip_tables", NULL, TRUE) != 0)
1237                 return NULL;
1238
1239         module = g_strconcat("iptable_", table_name, NULL);
1240         if (module == NULL)
1241                 return NULL;
1242
1243         if (xtables_insmod(module, NULL, TRUE) != 0) {
1244                 g_free(module);
1245                 return NULL;
1246         }
1247
1248         g_free(module);
1249
1250         table = g_hash_table_lookup(table_hash, table_name);
1251         if (table != NULL)
1252                 return table;
1253
1254         table = g_try_new0(struct connman_iptables, 1);
1255         if (table == NULL)
1256                 return NULL;
1257
1258         table->info = g_try_new0(struct ipt_getinfo, 1);
1259         if (table->info == NULL)
1260                 goto err;
1261
1262         table->ipt_sock = socket(AF_INET, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW);
1263         if (table->ipt_sock < 0)
1264                 goto err;
1265
1266         s = sizeof(*table->info);
1267         strcpy(table->info->name, table_name);
1268         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
1269                                                 table->info, &s) < 0)
1270                 goto err;
1271
1272         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
1273                                                 table->info->size);
1274         if (table->blob_entries == NULL)
1275                 goto err;
1276
1277         strcpy(table->blob_entries->name, table_name);
1278         table->blob_entries->size = table->info->size;
1279
1280         if (iptables_get_entries(table) < 0)
1281                 goto err;
1282
1283         table->num_entries = 0;
1284         table->old_entries = table->info->num_entries;
1285         table->size = 0;
1286
1287         memcpy(table->underflow, table->info->underflow,
1288                                 sizeof(table->info->underflow));
1289         memcpy(table->hook_entry, table->info->hook_entry,
1290                                 sizeof(table->info->hook_entry));
1291
1292         ENTRY_ITERATE(table->blob_entries->entrytable,
1293                         table->blob_entries->size,
1294                                 add_entry, table);
1295
1296         g_hash_table_insert(table_hash, g_strdup(table_name), table);
1297
1298         return table;
1299
1300 err:
1301         table_cleanup(table);
1302
1303         return NULL;
1304 }
1305
1306 static struct option iptables_opts[] = {
1307         {.name = "append",        .has_arg = 1, .val = 'A'},
1308         {.name = "compare",       .has_arg = 1, .val = 'C'},
1309         {.name = "delete",        .has_arg = 1, .val = 'D'},
1310         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
1311         {.name = "insert",        .has_arg = 1, .val = 'I'},
1312         {.name = "list",          .has_arg = 2, .val = 'L'},
1313         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
1314         {.name = "policy",        .has_arg = 1, .val = 'P'},
1315         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
1316         {.name = "destination",   .has_arg = 1, .val = 'd'},
1317         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
1318         {.name = "jump",          .has_arg = 1, .val = 'j'},
1319         {.name = "match",         .has_arg = 1, .val = 'm'},
1320         {.name = "out-interface", .has_arg = 1, .val = 'o'},
1321         {.name = "source",        .has_arg = 1, .val = 's'},
1322         {.name = "table",         .has_arg = 1, .val = 't'},
1323         {NULL},
1324 };
1325
1326 struct xtables_globals iptables_globals = {
1327         .option_offset = 0,
1328         .opts = iptables_opts,
1329         .orig_opts = iptables_opts,
1330 };
1331
1332 static struct xtables_target *prepare_target(struct connman_iptables *table,
1333                                                         char *target_name)
1334 {
1335         struct xtables_target *xt_t = NULL;
1336         gboolean is_builtin, is_user_defined;
1337         GList *chain_head = NULL;
1338         size_t target_size;
1339
1340         is_builtin = FALSE;
1341         is_user_defined = FALSE;
1342
1343         if (is_builtin_target(target_name))
1344                 is_builtin = TRUE;
1345         else {
1346                 chain_head = find_chain_head(table, target_name);
1347                 if (chain_head != NULL && chain_head->next != NULL)
1348                         is_user_defined = TRUE;
1349         }
1350
1351         if (is_builtin || is_user_defined)
1352                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
1353                                                 XTF_LOAD_MUST_SUCCEED);
1354         else
1355                 xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1356
1357         if (xt_t == NULL)
1358                 return NULL;
1359
1360         target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1361
1362         xt_t->t = g_try_malloc0(target_size);
1363         if (xt_t->t == NULL)
1364                 return NULL;
1365
1366         xt_t->t->u.target_size = target_size;
1367
1368         if (is_builtin || is_user_defined) {
1369                 struct xt_standard_target *target;
1370
1371                 target = (struct xt_standard_target *)(xt_t->t);
1372                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
1373
1374                 if (is_builtin == TRUE)
1375                         target->verdict = target_to_verdict(target_name);
1376                 else if (is_user_defined == TRUE) {
1377                         struct connman_iptables_entry *target_rule;
1378
1379                         if (chain_head == NULL) {
1380                                 g_free(xt_t->t);
1381                                 return NULL;
1382                         }
1383
1384                         target_rule = chain_head->next->data;
1385                         target->verdict = target_rule->offset;
1386                 }
1387         } else {
1388                 strcpy(xt_t->t->u.user.name, target_name);
1389                 xt_t->t->u.user.revision = xt_t->revision;
1390                 if (xt_t->init != NULL)
1391                         xt_t->init(xt_t->t);
1392         }
1393
1394 #if XTABLES_VERSION_CODE > 5
1395         if (xt_t->x6_options != NULL)
1396                 iptables_globals.opts =
1397                         xtables_options_xfrm(
1398                                 iptables_globals.orig_opts,
1399                                 iptables_globals.opts,
1400                                 xt_t->x6_options,
1401                                 &xt_t->option_offset);
1402         else
1403 #endif
1404                 iptables_globals.opts =
1405                         xtables_merge_options(
1406 #if XTABLES_VERSION_CODE > 5
1407                                 iptables_globals.orig_opts,
1408 #endif
1409                                 iptables_globals.opts,
1410                                 xt_t->extra_opts,
1411                                 &xt_t->option_offset);
1412
1413         if (iptables_globals.opts == NULL) {
1414                 g_free(xt_t->t);
1415                 xt_t = NULL;
1416         }
1417
1418         return xt_t;
1419 }
1420
1421 static struct xtables_match *prepare_matches(struct connman_iptables *table,
1422                         struct xtables_rule_match **xt_rm, char *match_name)
1423 {
1424         struct xtables_match *xt_m;
1425         size_t match_size;
1426
1427         if (match_name == NULL)
1428                 return NULL;
1429
1430         xt_m = xtables_find_match(match_name, XTF_LOAD_MUST_SUCCEED, xt_rm);
1431         match_size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
1432
1433         xt_m->m = g_try_malloc0(match_size);
1434         if (xt_m->m == NULL)
1435                 return NULL;
1436
1437         xt_m->m->u.match_size = match_size;
1438         strcpy(xt_m->m->u.user.name, xt_m->name);
1439         xt_m->m->u.user.revision = xt_m->revision;
1440
1441         if (xt_m->init != NULL)
1442                 xt_m->init(xt_m->m);
1443
1444         if (xt_m == xt_m->next)
1445                 goto done;
1446
1447 #if XTABLES_VERSION_CODE > 5
1448         if (xt_m->x6_options != NULL)
1449                 iptables_globals.opts =
1450                         xtables_options_xfrm(
1451                                 iptables_globals.orig_opts,
1452                                 iptables_globals.opts,
1453                                 xt_m->x6_options,
1454                                 &xt_m->option_offset);
1455         else
1456 #endif
1457                         iptables_globals.opts =
1458                         xtables_merge_options(
1459 #if XTABLES_VERSION_CODE > 5
1460                                 iptables_globals.orig_opts,
1461 #endif
1462                                 iptables_globals.opts,
1463                                 xt_m->extra_opts,
1464                                 &xt_m->option_offset);
1465
1466         if (iptables_globals.opts == NULL) {
1467                 g_free(xt_m->m);
1468                 xt_m = NULL;
1469         }
1470
1471 done:
1472         return xt_m;
1473 }
1474
1475 static int parse_ip_and_mask(const char *str, struct in_addr *ip, struct in_addr *mask)
1476 {
1477         char **tokens;
1478         uint32_t prefixlength;
1479         uint32_t tmp;
1480         int err;
1481
1482         tokens = g_strsplit(str, "/", 2);
1483         if (tokens == NULL)
1484                 return -1;
1485
1486         if (!inet_pton(AF_INET, tokens[0], ip)) {
1487                 err = -1;
1488                 goto out;
1489         }
1490
1491         if (tokens[1] != NULL) {
1492                 prefixlength = strtol(tokens[1], NULL, 10);
1493                 if (prefixlength > 31) {
1494                         err = -1;
1495                         goto out;
1496                 }
1497
1498                 tmp = ~(0xffffffff >> prefixlength);
1499         } else {
1500                 tmp = 0xffffffff;
1501         }
1502
1503         mask->s_addr = htonl(tmp);
1504         ip->s_addr = ip->s_addr & mask->s_addr;
1505         err = 0;
1506 out:
1507         g_strfreev(tokens);
1508
1509         return err;
1510 }
1511
1512 static struct connman_iptables *pre_load_table(char *table_name,
1513                                         struct connman_iptables *table)
1514 {
1515         if (table != NULL)
1516                 return table;
1517
1518         return iptables_init(table_name);
1519 }
1520
1521 static int iptables_command(int argc, char *argv[])
1522 {
1523         struct connman_iptables *table;
1524         struct xtables_rule_match *xt_rm, *tmp_xt_rm;
1525         struct xtables_match *xt_m, *xt_m_t;
1526         struct xtables_target *xt_t;
1527         struct ipt_ip ip;
1528         char *table_name, *chain, *new_chain, *match_name, *target_name;
1529         char *flush_chain, *delete_chain, *policy;
1530         int c, ret, in_len, out_len;
1531         gboolean dump, invert, insert, delete, compare;
1532
1533         if (argc == 0)
1534                 return -EINVAL;
1535
1536         dump = FALSE;
1537         invert = FALSE;
1538         insert = FALSE;
1539         delete = FALSE;
1540         compare = FALSE;
1541         chain = new_chain = match_name = target_name = NULL;
1542         flush_chain = delete_chain = policy = table_name = NULL;
1543         memset(&ip, 0, sizeof(struct ipt_ip));
1544         table = NULL;
1545         xt_rm = NULL;
1546         xt_m = NULL;
1547         xt_t = NULL;
1548         /* Default code for options parsing */
1549         ret = -EINVAL;
1550
1551         /* extension's options will generate false-positives errors */
1552         opterr = 0;
1553
1554         optind = 0;
1555
1556         while ((c = getopt_long(argc, argv,
1557                                         "-A:C:D:F:I:L::N:P:X:d:j:i:m:o:s:t:",
1558                                         iptables_globals.opts, NULL)) != -1) {
1559                 switch (c) {
1560                 case 'A':
1561                         /* It is either -A, -C, -D or -I at once */
1562                         if (chain)
1563                                 goto out;
1564
1565                         chain = optarg;
1566                         break;
1567
1568                 case 'C':
1569                         /* It is either -A, -C, -D or -I at once */
1570                         if (chain)
1571                                 goto out;
1572
1573                         chain = optarg;
1574                         compare = TRUE;
1575                         break;
1576
1577                 case 'D':
1578                         /* It is either -A, -C, -D or -I at once */
1579                         if (chain)
1580                                 goto out;
1581
1582                         chain = optarg;
1583                         delete = TRUE;
1584                         break;
1585
1586                 case 'F':
1587                         flush_chain = optarg;
1588                         break;
1589
1590                 case 'I':
1591                         /* It is either -A, -C, -D or -I at once */
1592                         if (chain)
1593                                 goto out;
1594
1595                         chain = optarg;
1596                         insert = TRUE;
1597                         break;
1598
1599                 case 'L':
1600                         dump = TRUE;
1601                         break;
1602
1603                 case 'N':
1604                         new_chain = optarg;
1605                         break;
1606
1607                 case 'P':
1608                         chain = optarg;
1609                         if (optind < argc)
1610                                 policy = argv[optind++];
1611                         else
1612                                 goto out;
1613
1614                         break;
1615
1616                 case 'X':
1617                         delete_chain = optarg;
1618                         break;
1619
1620                 case 'd':
1621                         if (!parse_ip_and_mask(optarg, &ip.dst, &ip.dmsk))
1622                                 break;
1623
1624                         if (invert)
1625                                 ip.invflags |= IPT_INV_DSTIP;
1626
1627                         break;
1628
1629                 case 'i':
1630                         in_len = strlen(optarg);
1631
1632                         if (in_len + 1 > IFNAMSIZ)
1633                                 break;
1634
1635                         strcpy(ip.iniface, optarg);
1636                         memset(ip.iniface_mask, 0xff, in_len + 1);
1637
1638                         if (invert)
1639                                 ip.invflags |= IPT_INV_VIA_IN;
1640
1641                         break;
1642
1643                 case 'j':
1644                         target_name = optarg;
1645
1646                         table = pre_load_table(table_name, table);
1647                         if (table == NULL)
1648                                 goto out;
1649
1650                         xt_t = prepare_target(table, target_name);
1651                         if (xt_t == NULL)
1652                                 goto out;
1653
1654                         break;
1655
1656                 case 'm':
1657                         match_name = optarg;
1658
1659                         table = pre_load_table(table_name, table);
1660                         if (table == NULL)
1661                                 goto out;
1662
1663                         xt_m = prepare_matches(table, &xt_rm, match_name);
1664                         if (xt_m == NULL)
1665                                 goto out;
1666
1667                         break;
1668
1669                 case 'o':
1670                         out_len = strlen(optarg);
1671
1672                         if (out_len + 1 > IFNAMSIZ)
1673                                 break;
1674
1675                         strcpy(ip.outiface, optarg);
1676                         memset(ip.outiface_mask, 0xff, out_len + 1);
1677
1678                         if (invert)
1679                                 ip.invflags |= IPT_INV_VIA_OUT;
1680
1681                         break;
1682
1683                 case 's':
1684                         if (!parse_ip_and_mask(optarg, &ip.src, &ip.smsk))
1685                                 break;
1686
1687                         if (invert)
1688                                 ip.invflags |= IPT_INV_SRCIP;
1689
1690                         break;
1691
1692                 case 't':
1693                         table_name = optarg;
1694
1695                         table = pre_load_table(table_name, table);
1696                         if (table == NULL)
1697                                 goto out;
1698
1699                         break;
1700
1701                 case 1:
1702                         if (optarg[0] == '!' && optarg[1] == '\0') {
1703                                 invert = TRUE;
1704                                 optarg[0] = '\0';
1705                                 continue;
1706                         }
1707
1708                         connman_error("Invalid option");
1709
1710                         goto out;
1711
1712                 default:
1713 #if XTABLES_VERSION_CODE > 5
1714                         if (xt_t != NULL && (xt_t->x6_parse != NULL ||
1715                                                 xt_t->parse != NULL) &&
1716                                         (c >= (int) xt_t->option_offset &&
1717                                         c < (int) xt_t->option_offset +
1718                                         XT_OPTION_OFFSET_SCALE)) {
1719                                 xtables_option_tpcall(c, argv,
1720                                                         invert, xt_t, NULL);
1721
1722                                 break;
1723                         }
1724
1725                         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1726                                                 tmp_xt_rm = tmp_xt_rm->next) {
1727                                 xt_m_t = tmp_xt_rm->match;
1728
1729                                 if (tmp_xt_rm->completed ||
1730                                                 (xt_m_t->x6_parse == NULL &&
1731                                                  xt_m_t->parse == NULL))
1732                                         continue;
1733
1734                                 if (c < (int) xt_m_t->option_offset ||
1735                                         c >= (int) xt_m_t->option_offset
1736                                         + XT_OPTION_OFFSET_SCALE)
1737                                         continue;
1738
1739                                 xtables_option_mpcall(c, argv,
1740                                                         invert, xt_m_t, NULL);
1741
1742                                 break;
1743                         }
1744 #else
1745                         if (xt_t == NULL || xt_t->parse == NULL ||
1746                                 !xt_t->parse(c - xt_t->option_offset,
1747                                 argv, invert, &xt_t->tflags, NULL, &xt_t->t)) {
1748
1749                                 for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1750                                                 tmp_xt_rm = tmp_xt_rm->next) {
1751                                         xt_m_t = tmp_xt_rm->match;
1752
1753                                         if (tmp_xt_rm->completed ||
1754                                                         xt_m_t->parse == NULL)
1755                                                 continue;
1756
1757                                         if (xt_m->parse(c - xt_m->option_offset,
1758                                                 argv, invert, &xt_m->mflags,
1759                                                 NULL, &xt_m->m))
1760                                                 break;
1761                                 }
1762                         }
1763 #endif
1764                         break;
1765                 }
1766
1767                 invert = FALSE;
1768         }
1769
1770 #if XTABLES_VERSION_CODE > 5
1771         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1772                                 tmp_xt_rm = tmp_xt_rm->next)
1773                 xtables_option_mfcall(tmp_xt_rm->match);
1774
1775         if (xt_t != NULL)
1776                 xtables_option_tfcall(xt_t);
1777 #else
1778         for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
1779                                 tmp_xt_rm = tmp_xt_rm->next)
1780                 if (tmp_xt_rm->match->final_check != NULL)
1781                         tmp_xt_rm->match->final_check(
1782                                         tmp_xt_rm->match->mflags);
1783
1784         if (xt_t != NULL && xt_t->final_check != NULL)
1785                 xt_t->final_check(xt_t->tflags);
1786 #endif
1787
1788         table = pre_load_table(table_name, table);
1789         if (table == NULL)
1790                 goto out;
1791
1792         /* Option parsing went fine, falling back to succes code */
1793         ret = 0;
1794
1795         if (delete_chain != NULL) {
1796                 printf("Delete chain %s\n", delete_chain);
1797
1798                 iptables_delete_chain(table, delete_chain);
1799
1800                 goto out;
1801         }
1802
1803         if (dump) {
1804                 iptables_dump(table);
1805
1806                 goto out;
1807         }
1808
1809         if (flush_chain) {
1810                 DBG("Flush chain %s", flush_chain);
1811
1812                 iptables_flush_chain(table, flush_chain);
1813
1814                 goto out;
1815         }
1816
1817         if (chain && new_chain) {
1818                 ret = -EINVAL;
1819                 goto out;
1820         }
1821
1822         if (new_chain) {
1823                 DBG("New chain %s", new_chain);
1824
1825                 ret = iptables_add_chain(table, new_chain);
1826                 goto out;
1827         }
1828
1829         if (chain) {
1830                 if (policy != NULL) {
1831                         printf("Changing policy of %s to %s\n", chain, policy);
1832
1833                         iptables_change_policy(table, chain, policy);
1834
1835                         goto out;
1836                 }
1837
1838                 if (xt_t == NULL)
1839                         goto out;
1840
1841                 if (compare == TRUE) {
1842                         ret = iptables_compare_rule(table, &ip, chain,
1843                                         target_name, xt_t, xt_m, xt_rm);
1844                         goto out;
1845                 }
1846
1847                 if (delete == TRUE) {
1848                         DBG("Deleting %s to %s (match %s)\n",
1849                                         target_name, chain, match_name);
1850
1851                         ret = iptables_delete_rule(table, &ip, chain,
1852                                         target_name, xt_t, xt_m, xt_rm);
1853
1854                         goto out;
1855                 }
1856
1857                 if (insert == TRUE) {
1858                         DBG("Inserting %s to %s (match %s)",
1859                                         target_name, chain, match_name);
1860
1861                         ret = iptables_insert_rule(table, &ip, chain,
1862                                                 target_name, xt_t, xt_rm);
1863
1864                         goto out;
1865                 } else {
1866                         DBG("Adding %s to %s (match %s)",
1867                                         target_name, chain, match_name);
1868
1869                         ret = iptables_append_rule(table, &ip, chain,
1870                                                 target_name, xt_t, xt_rm);
1871
1872                         goto out;
1873                 }
1874         }
1875
1876 out:
1877         if (xt_t)
1878                 g_free(xt_t->t);
1879
1880         if (xt_m)
1881                 g_free(xt_m->m);
1882
1883         return ret;
1884 }
1885
1886 int __connman_iptables_command(const char *format, ...)
1887 {
1888         char **argv, **arguments, *command;
1889         int argc, i, ret;
1890         va_list args;
1891
1892         if (format == NULL)
1893                 return -EINVAL;
1894
1895         va_start(args, format);
1896
1897         command = g_strdup_vprintf(format, args);
1898
1899         va_end(args);
1900
1901         if (command == NULL)
1902                 return -ENOMEM;
1903
1904         arguments = g_strsplit_set(command, " ", -1);
1905
1906         for (argc = 0; arguments[argc]; argc++);
1907         ++argc;
1908
1909         DBG("command %s argc %d", command, argc);
1910
1911         argv = g_try_malloc0(argc * sizeof(char *));
1912         if (argv == NULL) {
1913                 g_free(command);
1914                 g_strfreev(arguments);
1915                 return -ENOMEM;
1916         }
1917
1918         argv[0] = "iptables";
1919         for (i = 1; i < argc; i++)
1920                 argv[i] = arguments[i - 1];
1921
1922         ret = iptables_command(argc, argv);
1923
1924         g_free(command);
1925         g_strfreev(arguments);
1926         g_free(argv);
1927
1928         return ret;
1929 }
1930
1931
1932 int __connman_iptables_commit(const char *table_name)
1933 {
1934         struct connman_iptables *table;
1935         struct ipt_replace *repl;
1936         int err;
1937
1938         DBG("%s", table_name);
1939
1940         table = g_hash_table_lookup(table_hash, table_name);
1941         if (table == NULL)
1942                 return -EINVAL;
1943
1944         repl = iptables_blob(table);
1945
1946         err = iptables_replace(table, repl);
1947
1948         g_free(repl->counters);
1949         g_free(repl);
1950
1951         if (err < 0)
1952             return err;
1953
1954         g_hash_table_remove(table_hash, table_name);
1955
1956         return 0;
1957 }
1958
1959 static void remove_table(gpointer user_data)
1960 {
1961         struct connman_iptables *table = user_data;
1962
1963         table_cleanup(table);
1964 }
1965
1966 int __connman_iptables_init(void)
1967 {
1968         DBG("");
1969
1970         table_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
1971                                                 g_free, remove_table);
1972
1973         xtables_init_all(&iptables_globals, NFPROTO_IPV4);
1974
1975         return 0;
1976
1977 }
1978
1979 void __connman_iptables_cleanup(void)
1980 {
1981         DBG("");
1982
1983         g_hash_table_destroy(table_hash);
1984
1985         xtables_free_opts(1);
1986 }